Bug Summary

File:src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/lib/Sema/SemaInit.cpp
Warning:line 5583, column 9
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaInit.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/gnu/usr.bin/clang/libclangSema/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/gnu/usr.bin/clang/libclangSema/obj/../include/clang/Sema -I /usr/src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/include -I /usr/src/gnu/usr.bin/clang/libclangSema/../../../llvm/llvm/include -I /usr/src/gnu/usr.bin/clang/libclangSema/../include -I /usr/src/gnu/usr.bin/clang/libclangSema/obj -I /usr/src/gnu/usr.bin/clang/libclangSema/obj/../include -D NDEBUG -D __STDC_LIMIT_MACROS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D LLVM_PREFIX="/usr" -internal-isystem /usr/include/c++/v1 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/usr/src/gnu/usr.bin/clang/libclangSema/obj -ferror-limit 19 -fvisibility-inlines-hidden -fwrapv -stack-protector 2 -fno-rtti -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c++ /usr/src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/lib/Sema/SemaInit.cpp

/usr/src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/lib/Sema/SemaInit.cpp

→
1//===--- SemaInit.cpp - Semantic Analysis for Initializers ----------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements semantic analysis for initializers.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/AST/ASTContext.h"
14#include "clang/AST/DeclObjC.h"
15#include "clang/AST/ExprCXX.h"
16#include "clang/AST/ExprObjC.h"
17#include "clang/AST/ExprOpenMP.h"
18#include "clang/AST/TypeLoc.h"
19#include "clang/Basic/CharInfo.h"
20#include "clang/Basic/SourceManager.h"
21#include "clang/Basic/TargetInfo.h"
22#include "clang/Sema/Designator.h"
23#include "clang/Sema/Initialization.h"
24#include "clang/Sema/Lookup.h"
25#include "clang/Sema/SemaInternal.h"
26#include "llvm/ADT/APInt.h"
27#include "llvm/ADT/PointerIntPair.h"
28#include "llvm/ADT/SmallString.h"
29#include "llvm/Support/ErrorHandling.h"
30#include "llvm/Support/raw_ostream.h"
31
32using namespace clang;
33
34//===----------------------------------------------------------------------===//
35// Sema Initialization Checking
36//===----------------------------------------------------------------------===//
37
38/// Check whether T is compatible with a wide character type (wchar_t,
39/// char16_t or char32_t).
40static bool IsWideCharCompatible(QualType T, ASTContext &Context) {
41 if (Context.typesAreCompatible(Context.getWideCharType(), T))
42 return true;
43 if (Context.getLangOpts().CPlusPlus || Context.getLangOpts().C11) {
44 return Context.typesAreCompatible(Context.Char16Ty, T) ||
45 Context.typesAreCompatible(Context.Char32Ty, T);
46 }
47 return false;
48}
49
50enum StringInitFailureKind {
51 SIF_None,
52 SIF_NarrowStringIntoWideChar,
53 SIF_WideStringIntoChar,
54 SIF_IncompatWideStringIntoWideChar,
55 SIF_UTF8StringIntoPlainChar,
56 SIF_PlainStringIntoUTF8Char,
57 SIF_Other
58};
59
60/// Check whether the array of type AT can be initialized by the Init
61/// expression by means of string initialization. Returns SIF_None if so,
62/// otherwise returns a StringInitFailureKind that describes why the
63/// initialization would not work.
64static StringInitFailureKind IsStringInit(Expr *Init, const ArrayType *AT,
65 ASTContext &Context) {
66 if (!isa<ConstantArrayType>(AT) && !isa<IncompleteArrayType>(AT))
67 return SIF_Other;
68
69 // See if this is a string literal or @encode.
70 Init = Init->IgnoreParens();
71
72 // Handle @encode, which is a narrow string.
73 if (isa<ObjCEncodeExpr>(Init) && AT->getElementType()->isCharType())
74 return SIF_None;
75
76 // Otherwise we can only handle string literals.
77 StringLiteral *SL = dyn_cast<StringLiteral>(Init);
78 if (!SL)
79 return SIF_Other;
80
81 const QualType ElemTy =
82 Context.getCanonicalType(AT->getElementType()).getUnqualifiedType();
83
84 switch (SL->getKind()) {
85 case StringLiteral::UTF8:
86 // char8_t array can be initialized with a UTF-8 string.
87 if (ElemTy->isChar8Type())
88 return SIF_None;
89 LLVM_FALLTHROUGH[[gnu::fallthrough]];
90 case StringLiteral::Ascii:
91 // char array can be initialized with a narrow string.
92 // Only allow char x[] = "foo"; not char x[] = L"foo";
93 if (ElemTy->isCharType())
94 return (SL->getKind() == StringLiteral::UTF8 &&
95 Context.getLangOpts().Char8)
96 ? SIF_UTF8StringIntoPlainChar
97 : SIF_None;
98 if (ElemTy->isChar8Type())
99 return SIF_PlainStringIntoUTF8Char;
100 if (IsWideCharCompatible(ElemTy, Context))
101 return SIF_NarrowStringIntoWideChar;
102 return SIF_Other;
103 // C99 6.7.8p15 (with correction from DR343), or C11 6.7.9p15:
104 // "An array with element type compatible with a qualified or unqualified
105 // version of wchar_t, char16_t, or char32_t may be initialized by a wide
106 // string literal with the corresponding encoding prefix (L, u, or U,
107 // respectively), optionally enclosed in braces.
108 case StringLiteral::UTF16:
109 if (Context.typesAreCompatible(Context.Char16Ty, ElemTy))
110 return SIF_None;
111 if (ElemTy->isCharType() || ElemTy->isChar8Type())
112 return SIF_WideStringIntoChar;
113 if (IsWideCharCompatible(ElemTy, Context))
114 return SIF_IncompatWideStringIntoWideChar;
115 return SIF_Other;
116 case StringLiteral::UTF32:
117 if (Context.typesAreCompatible(Context.Char32Ty, ElemTy))
118 return SIF_None;
119 if (ElemTy->isCharType() || ElemTy->isChar8Type())
120 return SIF_WideStringIntoChar;
121 if (IsWideCharCompatible(ElemTy, Context))
122 return SIF_IncompatWideStringIntoWideChar;
123 return SIF_Other;
124 case StringLiteral::Wide:
125 if (Context.typesAreCompatible(Context.getWideCharType(), ElemTy))
126 return SIF_None;
127 if (ElemTy->isCharType() || ElemTy->isChar8Type())
128 return SIF_WideStringIntoChar;
129 if (IsWideCharCompatible(ElemTy, Context))
130 return SIF_IncompatWideStringIntoWideChar;
131 return SIF_Other;
132 }
133
134 llvm_unreachable("missed a StringLiteral kind?")__builtin_unreachable();
135}
136
137static StringInitFailureKind IsStringInit(Expr *init, QualType declType,
138 ASTContext &Context) {
139 const ArrayType *arrayType = Context.getAsArrayType(declType);
140 if (!arrayType)
141 return SIF_Other;
142 return IsStringInit(init, arrayType, Context);
143}
144
145bool Sema::IsStringInit(Expr *Init, const ArrayType *AT) {
146 return ::IsStringInit(Init, AT, Context) == SIF_None;
147}
148
149/// Update the type of a string literal, including any surrounding parentheses,
150/// to match the type of the object which it is initializing.
151static void updateStringLiteralType(Expr *E, QualType Ty) {
152 while (true) {
153 E->setType(Ty);
154 E->setValueKind(VK_PRValue);
155 if (isa<StringLiteral>(E) || isa<ObjCEncodeExpr>(E)) {
156 break;
157 } else if (ParenExpr *PE = dyn_cast<ParenExpr>(E)) {
158 E = PE->getSubExpr();
159 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
160 assert(UO->getOpcode() == UO_Extension)((void)0);
161 E = UO->getSubExpr();
162 } else if (GenericSelectionExpr *GSE = dyn_cast<GenericSelectionExpr>(E)) {
163 E = GSE->getResultExpr();
164 } else if (ChooseExpr *CE = dyn_cast<ChooseExpr>(E)) {
165 E = CE->getChosenSubExpr();
166 } else {
167 llvm_unreachable("unexpected expr in string literal init")__builtin_unreachable();
168 }
169 }
170}
171
172/// Fix a compound literal initializing an array so it's correctly marked
173/// as an rvalue.
174static void updateGNUCompoundLiteralRValue(Expr *E) {
175 while (true) {
176 E->setValueKind(VK_PRValue);
177 if (isa<CompoundLiteralExpr>(E)) {
178 break;
179 } else if (ParenExpr *PE = dyn_cast<ParenExpr>(E)) {
180 E = PE->getSubExpr();
181 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
182 assert(UO->getOpcode() == UO_Extension)((void)0);
183 E = UO->getSubExpr();
184 } else if (GenericSelectionExpr *GSE = dyn_cast<GenericSelectionExpr>(E)) {
185 E = GSE->getResultExpr();
186 } else if (ChooseExpr *CE = dyn_cast<ChooseExpr>(E)) {
187 E = CE->getChosenSubExpr();
188 } else {
189 llvm_unreachable("unexpected expr in array compound literal init")__builtin_unreachable();
190 }
191 }
192}
193
194static void CheckStringInit(Expr *Str, QualType &DeclT, const ArrayType *AT,
195 Sema &S) {
196 // Get the length of the string as parsed.
197 auto *ConstantArrayTy =
198 cast<ConstantArrayType>(Str->getType()->getAsArrayTypeUnsafe());
199 uint64_t StrLength = ConstantArrayTy->getSize().getZExtValue();
200
201 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) {
202 // C99 6.7.8p14. We have an array of character type with unknown size
203 // being initialized to a string literal.
204 llvm::APInt ConstVal(32, StrLength);
205 // Return a new array type (C99 6.7.8p22).
206 DeclT = S.Context.getConstantArrayType(IAT->getElementType(),
207 ConstVal, nullptr,
208 ArrayType::Normal, 0);
209 updateStringLiteralType(Str, DeclT);
210 return;
211 }
212
213 const ConstantArrayType *CAT = cast<ConstantArrayType>(AT);
214
215 // We have an array of character type with known size. However,
216 // the size may be smaller or larger than the string we are initializing.
217 // FIXME: Avoid truncation for 64-bit length strings.
218 if (S.getLangOpts().CPlusPlus) {
219 if (StringLiteral *SL = dyn_cast<StringLiteral>(Str->IgnoreParens())) {
220 // For Pascal strings it's OK to strip off the terminating null character,
221 // so the example below is valid:
222 //
223 // unsigned char a[2] = "\pa";
224 if (SL->isPascal())
225 StrLength--;
226 }
227
228 // [dcl.init.string]p2
229 if (StrLength > CAT->getSize().getZExtValue())
230 S.Diag(Str->getBeginLoc(),
231 diag::err_initializer_string_for_char_array_too_long)
232 << Str->getSourceRange();
233 } else {
234 // C99 6.7.8p14.
235 if (StrLength-1 > CAT->getSize().getZExtValue())
236 S.Diag(Str->getBeginLoc(),
237 diag::ext_initializer_string_for_char_array_too_long)
238 << Str->getSourceRange();
239 }
240
241 // Set the type to the actual size that we are initializing. If we have
242 // something like:
243 // char x[1] = "foo";
244 // then this will set the string literal's type to char[1].
245 updateStringLiteralType(Str, DeclT);
246}
247
248//===----------------------------------------------------------------------===//
249// Semantic checking for initializer lists.
250//===----------------------------------------------------------------------===//
251
252namespace {
253
254/// Semantic checking for initializer lists.
255///
256/// The InitListChecker class contains a set of routines that each
257/// handle the initialization of a certain kind of entity, e.g.,
258/// arrays, vectors, struct/union types, scalars, etc. The
259/// InitListChecker itself performs a recursive walk of the subobject
260/// structure of the type to be initialized, while stepping through
261/// the initializer list one element at a time. The IList and Index
262/// parameters to each of the Check* routines contain the active
263/// (syntactic) initializer list and the index into that initializer
264/// list that represents the current initializer. Each routine is
265/// responsible for moving that Index forward as it consumes elements.
266///
267/// Each Check* routine also has a StructuredList/StructuredIndex
268/// arguments, which contains the current "structured" (semantic)
269/// initializer list and the index into that initializer list where we
270/// are copying initializers as we map them over to the semantic
271/// list. Once we have completed our recursive walk of the subobject
272/// structure, we will have constructed a full semantic initializer
273/// list.
274///
275/// C99 designators cause changes in the initializer list traversal,
276/// because they make the initialization "jump" into a specific
277/// subobject and then continue the initialization from that
278/// point. CheckDesignatedInitializer() recursively steps into the
279/// designated subobject and manages backing out the recursion to
280/// initialize the subobjects after the one designated.
281///
282/// If an initializer list contains any designators, we build a placeholder
283/// structured list even in 'verify only' mode, so that we can track which
284/// elements need 'empty' initializtion.
285class InitListChecker {
286 Sema &SemaRef;
287 bool hadError = false;
288 bool VerifyOnly; // No diagnostics.
289 bool TreatUnavailableAsInvalid; // Used only in VerifyOnly mode.
290 bool InOverloadResolution;
291 InitListExpr *FullyStructuredList = nullptr;
292 NoInitExpr *DummyExpr = nullptr;
293
294 NoInitExpr *getDummyInit() {
295 if (!DummyExpr)
296 DummyExpr = new (SemaRef.Context) NoInitExpr(SemaRef.Context.VoidTy);
297 return DummyExpr;
298 }
299
300 void CheckImplicitInitList(const InitializedEntity &Entity,
301 InitListExpr *ParentIList, QualType T,
302 unsigned &Index, InitListExpr *StructuredList,
303 unsigned &StructuredIndex);
304 void CheckExplicitInitList(const InitializedEntity &Entity,
305 InitListExpr *IList, QualType &T,
306 InitListExpr *StructuredList,
307 bool TopLevelObject = false);
308 void CheckListElementTypes(const InitializedEntity &Entity,
309 InitListExpr *IList, QualType &DeclType,
310 bool SubobjectIsDesignatorContext,
311 unsigned &Index,
312 InitListExpr *StructuredList,
313 unsigned &StructuredIndex,
314 bool TopLevelObject = false);
315 void CheckSubElementType(const InitializedEntity &Entity,
316 InitListExpr *IList, QualType ElemType,
317 unsigned &Index,
318 InitListExpr *StructuredList,
319 unsigned &StructuredIndex,
320 bool DirectlyDesignated = false);
321 void CheckComplexType(const InitializedEntity &Entity,
322 InitListExpr *IList, QualType DeclType,
323 unsigned &Index,
324 InitListExpr *StructuredList,
325 unsigned &StructuredIndex);
326 void CheckScalarType(const InitializedEntity &Entity,
327 InitListExpr *IList, QualType DeclType,
328 unsigned &Index,
329 InitListExpr *StructuredList,
330 unsigned &StructuredIndex);
331 void CheckReferenceType(const InitializedEntity &Entity,
332 InitListExpr *IList, QualType DeclType,
333 unsigned &Index,
334 InitListExpr *StructuredList,
335 unsigned &StructuredIndex);
336 void CheckVectorType(const InitializedEntity &Entity,
337 InitListExpr *IList, QualType DeclType, unsigned &Index,
338 InitListExpr *StructuredList,
339 unsigned &StructuredIndex);
340 void CheckStructUnionTypes(const InitializedEntity &Entity,
341 InitListExpr *IList, QualType DeclType,
342 CXXRecordDecl::base_class_range Bases,
343 RecordDecl::field_iterator Field,
344 bool SubobjectIsDesignatorContext, unsigned &Index,
345 InitListExpr *StructuredList,
346 unsigned &StructuredIndex,
347 bool TopLevelObject = false);
348 void CheckArrayType(const InitializedEntity &Entity,
349 InitListExpr *IList, QualType &DeclType,
350 llvm::APSInt elementIndex,
351 bool SubobjectIsDesignatorContext, unsigned &Index,
352 InitListExpr *StructuredList,
353 unsigned &StructuredIndex);
354 bool CheckDesignatedInitializer(const InitializedEntity &Entity,
355 InitListExpr *IList, DesignatedInitExpr *DIE,
356 unsigned DesigIdx,
357 QualType &CurrentObjectType,
358 RecordDecl::field_iterator *NextField,
359 llvm::APSInt *NextElementIndex,
360 unsigned &Index,
361 InitListExpr *StructuredList,
362 unsigned &StructuredIndex,
363 bool FinishSubobjectInit,
364 bool TopLevelObject);
365 InitListExpr *getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
366 QualType CurrentObjectType,
367 InitListExpr *StructuredList,
368 unsigned StructuredIndex,
369 SourceRange InitRange,
370 bool IsFullyOverwritten = false);
371 void UpdateStructuredListElement(InitListExpr *StructuredList,
372 unsigned &StructuredIndex,
373 Expr *expr);
374 InitListExpr *createInitListExpr(QualType CurrentObjectType,
375 SourceRange InitRange,
376 unsigned ExpectedNumInits);
377 int numArrayElements(QualType DeclType);
378 int numStructUnionElements(QualType DeclType);
379
380 ExprResult PerformEmptyInit(SourceLocation Loc,
381 const InitializedEntity &Entity);
382
383 /// Diagnose that OldInit (or part thereof) has been overridden by NewInit.
384 void diagnoseInitOverride(Expr *OldInit, SourceRange NewInitRange,
385 bool FullyOverwritten = true) {
386 // Overriding an initializer via a designator is valid with C99 designated
387 // initializers, but ill-formed with C++20 designated initializers.
388 unsigned DiagID = SemaRef.getLangOpts().CPlusPlus
389 ? diag::ext_initializer_overrides
390 : diag::warn_initializer_overrides;
391
392 if (InOverloadResolution && SemaRef.getLangOpts().CPlusPlus) {
393 // In overload resolution, we have to strictly enforce the rules, and so
394 // don't allow any overriding of prior initializers. This matters for a
395 // case such as:
396 //
397 // union U { int a, b; };
398 // struct S { int a, b; };
399 // void f(U), f(S);
400 //
401 // Here, f({.a = 1, .b = 2}) is required to call the struct overload. For
402 // consistency, we disallow all overriding of prior initializers in
403 // overload resolution, not only overriding of union members.
404 hadError = true;
405 } else if (OldInit->getType().isDestructedType() && !FullyOverwritten) {
406 // If we'll be keeping around the old initializer but overwriting part of
407 // the object it initialized, and that object is not trivially
408 // destructible, this can leak. Don't allow that, not even as an
409 // extension.
410 //
411 // FIXME: It might be reasonable to allow this in cases where the part of
412 // the initializer that we're overriding has trivial destruction.
413 DiagID = diag::err_initializer_overrides_destructed;
414 } else if (!OldInit->getSourceRange().isValid()) {
415 // We need to check on source range validity because the previous
416 // initializer does not have to be an explicit initializer. e.g.,
417 //
418 // struct P { int a, b; };
419 // struct PP { struct P p } l = { { .a = 2 }, .p.b = 3 };
420 //
421 // There is an overwrite taking place because the first braced initializer
422 // list "{ .a = 2 }" already provides value for .p.b (which is zero).
423 //
424 // Such overwrites are harmless, so we don't diagnose them. (Note that in
425 // C++, this cannot be reached unless we've already seen and diagnosed a
426 // different conformance issue, such as a mixture of designated and
427 // non-designated initializers or a multi-level designator.)
428 return;
429 }
430
431 if (!VerifyOnly) {
432 SemaRef.Diag(NewInitRange.getBegin(), DiagID)
433 << NewInitRange << FullyOverwritten << OldInit->getType();
434 SemaRef.Diag(OldInit->getBeginLoc(), diag::note_previous_initializer)
435 << (OldInit->HasSideEffects(SemaRef.Context) && FullyOverwritten)
436 << OldInit->getSourceRange();
437 }
438 }
439
440 // Explanation on the "FillWithNoInit" mode:
441 //
442 // Assume we have the following definitions (Case#1):
443 // struct P { char x[6][6]; } xp = { .x[1] = "bar" };
444 // struct PP { struct P lp; } l = { .lp = xp, .lp.x[1][2] = 'f' };
445 //
446 // l.lp.x[1][0..1] should not be filled with implicit initializers because the
447 // "base" initializer "xp" will provide values for them; l.lp.x[1] will be "baf".
448 //
449 // But if we have (Case#2):
450 // struct PP l = { .lp = xp, .lp.x[1] = { [2] = 'f' } };
451 //
452 // l.lp.x[1][0..1] are implicitly initialized and do not use values from the
453 // "base" initializer; l.lp.x[1] will be "\0\0f\0\0\0".
454 //
455 // To distinguish Case#1 from Case#2, and also to avoid leaving many "holes"
456 // in the InitListExpr, the "holes" in Case#1 are filled not with empty
457 // initializers but with special "NoInitExpr" place holders, which tells the
458 // CodeGen not to generate any initializers for these parts.
459 void FillInEmptyInitForBase(unsigned Init, const CXXBaseSpecifier &Base,
460 const InitializedEntity &ParentEntity,
461 InitListExpr *ILE, bool &RequiresSecondPass,
462 bool FillWithNoInit);
463 void FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
464 const InitializedEntity &ParentEntity,
465 InitListExpr *ILE, bool &RequiresSecondPass,
466 bool FillWithNoInit = false);
467 void FillInEmptyInitializations(const InitializedEntity &Entity,
468 InitListExpr *ILE, bool &RequiresSecondPass,
469 InitListExpr *OuterILE, unsigned OuterIndex,
470 bool FillWithNoInit = false);
471 bool CheckFlexibleArrayInit(const InitializedEntity &Entity,
472 Expr *InitExpr, FieldDecl *Field,
473 bool TopLevelObject);
474 void CheckEmptyInitializable(const InitializedEntity &Entity,
475 SourceLocation Loc);
476
477public:
478 InitListChecker(Sema &S, const InitializedEntity &Entity, InitListExpr *IL,
479 QualType &T, bool VerifyOnly, bool TreatUnavailableAsInvalid,
480 bool InOverloadResolution = false);
481 bool HadError() { return hadError; }
482
483 // Retrieves the fully-structured initializer list used for
484 // semantic analysis and code generation.
485 InitListExpr *getFullyStructuredList() const { return FullyStructuredList; }
486};
487
488} // end anonymous namespace
489
490ExprResult InitListChecker::PerformEmptyInit(SourceLocation Loc,
491 const InitializedEntity &Entity) {
492 InitializationKind Kind = InitializationKind::CreateValue(Loc, Loc, Loc,
493 true);
494 MultiExprArg SubInit;
495 Expr *InitExpr;
496 InitListExpr DummyInitList(SemaRef.Context, Loc, None, Loc);
497
498 // C++ [dcl.init.aggr]p7:
499 // If there are fewer initializer-clauses in the list than there are
500 // members in the aggregate, then each member not explicitly initialized
501 // ...
502 bool EmptyInitList = SemaRef.getLangOpts().CPlusPlus11 &&
503 Entity.getType()->getBaseElementTypeUnsafe()->isRecordType();
504 if (EmptyInitList) {
505 // C++1y / DR1070:
506 // shall be initialized [...] from an empty initializer list.
507 //
508 // We apply the resolution of this DR to C++11 but not C++98, since C++98
509 // does not have useful semantics for initialization from an init list.
510 // We treat this as copy-initialization, because aggregate initialization
511 // always performs copy-initialization on its elements.
512 //
513 // Only do this if we're initializing a class type, to avoid filling in
514 // the initializer list where possible.
515 InitExpr = VerifyOnly ? &DummyInitList : new (SemaRef.Context)
516 InitListExpr(SemaRef.Context, Loc, None, Loc);
517 InitExpr->setType(SemaRef.Context.VoidTy);
518 SubInit = InitExpr;
519 Kind = InitializationKind::CreateCopy(Loc, Loc);
520 } else {
521 // C++03:
522 // shall be value-initialized.
523 }
524
525 InitializationSequence InitSeq(SemaRef, Entity, Kind, SubInit);
526 // libstdc++4.6 marks the vector default constructor as explicit in
527 // _GLIBCXX_DEBUG mode, so recover using the C++03 logic in that case.
528 // stlport does so too. Look for std::__debug for libstdc++, and for
529 // std:: for stlport. This is effectively a compiler-side implementation of
530 // LWG2193.
531 if (!InitSeq && EmptyInitList && InitSeq.getFailureKind() ==
532 InitializationSequence::FK_ExplicitConstructor) {
533 OverloadCandidateSet::iterator Best;
534 OverloadingResult O =
535 InitSeq.getFailedCandidateSet()
536 .BestViableFunction(SemaRef, Kind.getLocation(), Best);
537 (void)O;
538 assert(O == OR_Success && "Inconsistent overload resolution")((void)0);
539 CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
540 CXXRecordDecl *R = CtorDecl->getParent();
541
542 if (CtorDecl->getMinRequiredArguments() == 0 &&
543 CtorDecl->isExplicit() && R->getDeclName() &&
544 SemaRef.SourceMgr.isInSystemHeader(CtorDecl->getLocation())) {
545 bool IsInStd = false;
546 for (NamespaceDecl *ND = dyn_cast<NamespaceDecl>(R->getDeclContext());
547 ND && !IsInStd; ND = dyn_cast<NamespaceDecl>(ND->getParent())) {
548 if (SemaRef.getStdNamespace()->InEnclosingNamespaceSetOf(ND))
549 IsInStd = true;
550 }
551
552 if (IsInStd && llvm::StringSwitch<bool>(R->getName())
553 .Cases("basic_string", "deque", "forward_list", true)
554 .Cases("list", "map", "multimap", "multiset", true)
555 .Cases("priority_queue", "queue", "set", "stack", true)
556 .Cases("unordered_map", "unordered_set", "vector", true)
557 .Default(false)) {
558 InitSeq.InitializeFrom(
559 SemaRef, Entity,
560 InitializationKind::CreateValue(Loc, Loc, Loc, true),
561 MultiExprArg(), /*TopLevelOfInitList=*/false,
562 TreatUnavailableAsInvalid);
563 // Emit a warning for this. System header warnings aren't shown
564 // by default, but people working on system headers should see it.
565 if (!VerifyOnly) {
566 SemaRef.Diag(CtorDecl->getLocation(),
567 diag::warn_invalid_initializer_from_system_header);
568 if (Entity.getKind() == InitializedEntity::EK_Member)
569 SemaRef.Diag(Entity.getDecl()->getLocation(),
570 diag::note_used_in_initialization_here);
571 else if (Entity.getKind() == InitializedEntity::EK_ArrayElement)
572 SemaRef.Diag(Loc, diag::note_used_in_initialization_here);
573 }
574 }
575 }
576 }
577 if (!InitSeq) {
578 if (!VerifyOnly) {
579 InitSeq.Diagnose(SemaRef, Entity, Kind, SubInit);
580 if (Entity.getKind() == InitializedEntity::EK_Member)
581 SemaRef.Diag(Entity.getDecl()->getLocation(),
582 diag::note_in_omitted_aggregate_initializer)
583 << /*field*/1 << Entity.getDecl();
584 else if (Entity.getKind() == InitializedEntity::EK_ArrayElement) {
585 bool IsTrailingArrayNewMember =
586 Entity.getParent() &&
587 Entity.getParent()->isVariableLengthArrayNew();
588 SemaRef.Diag(Loc, diag::note_in_omitted_aggregate_initializer)
589 << (IsTrailingArrayNewMember ? 2 : /*array element*/0)
590 << Entity.getElementIndex();
591 }
592 }
593 hadError = true;
594 return ExprError();
595 }
596
597 return VerifyOnly ? ExprResult()
598 : InitSeq.Perform(SemaRef, Entity, Kind, SubInit);
599}
600
601void InitListChecker::CheckEmptyInitializable(const InitializedEntity &Entity,
602 SourceLocation Loc) {
603 // If we're building a fully-structured list, we'll check this at the end
604 // once we know which elements are actually initialized. Otherwise, we know
605 // that there are no designators so we can just check now.
606 if (FullyStructuredList)
607 return;
608 PerformEmptyInit(Loc, Entity);
609}
610
611void InitListChecker::FillInEmptyInitForBase(
612 unsigned Init, const CXXBaseSpecifier &Base,
613 const InitializedEntity &ParentEntity, InitListExpr *ILE,
614 bool &RequiresSecondPass, bool FillWithNoInit) {
615 InitializedEntity BaseEntity = InitializedEntity::InitializeBase(
616 SemaRef.Context, &Base, false, &ParentEntity);
617
618 if (Init >= ILE->getNumInits() || !ILE->getInit(Init)) {
619 ExprResult BaseInit = FillWithNoInit
620 ? new (SemaRef.Context) NoInitExpr(Base.getType())
621 : PerformEmptyInit(ILE->getEndLoc(), BaseEntity);
622 if (BaseInit.isInvalid()) {
623 hadError = true;
624 return;
625 }
626
627 if (!VerifyOnly) {
628 assert(Init < ILE->getNumInits() && "should have been expanded")((void)0);
629 ILE->setInit(Init, BaseInit.getAs<Expr>());
630 }
631 } else if (InitListExpr *InnerILE =
632 dyn_cast<InitListExpr>(ILE->getInit(Init))) {
633 FillInEmptyInitializations(BaseEntity, InnerILE, RequiresSecondPass,
634 ILE, Init, FillWithNoInit);
635 } else if (DesignatedInitUpdateExpr *InnerDIUE =
636 dyn_cast<DesignatedInitUpdateExpr>(ILE->getInit(Init))) {
637 FillInEmptyInitializations(BaseEntity, InnerDIUE->getUpdater(),
638 RequiresSecondPass, ILE, Init,
639 /*FillWithNoInit =*/true);
640 }
641}
642
643void InitListChecker::FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
644 const InitializedEntity &ParentEntity,
645 InitListExpr *ILE,
646 bool &RequiresSecondPass,
647 bool FillWithNoInit) {
648 SourceLocation Loc = ILE->getEndLoc();
649 unsigned NumInits = ILE->getNumInits();
650 InitializedEntity MemberEntity
651 = InitializedEntity::InitializeMember(Field, &ParentEntity);
652
653 if (Init >= NumInits || !ILE->getInit(Init)) {
654 if (const RecordType *RType = ILE->getType()->getAs<RecordType>())
655 if (!RType->getDecl()->isUnion())
656 assert((Init < NumInits || VerifyOnly) &&((void)0)
657 "This ILE should have been expanded")((void)0);
658
659 if (FillWithNoInit) {
660 assert(!VerifyOnly && "should not fill with no-init in verify-only mode")((void)0);
661 Expr *Filler = new (SemaRef.Context) NoInitExpr(Field->getType());
662 if (Init < NumInits)
663 ILE->setInit(Init, Filler);
664 else
665 ILE->updateInit(SemaRef.Context, Init, Filler);
666 return;
667 }
668 // C++1y [dcl.init.aggr]p7:
669 // If there are fewer initializer-clauses in the list than there are
670 // members in the aggregate, then each member not explicitly initialized
671 // shall be initialized from its brace-or-equal-initializer [...]
672 if (Field->hasInClassInitializer()) {
673 if (VerifyOnly)
674 return;
675
676 ExprResult DIE = SemaRef.BuildCXXDefaultInitExpr(Loc, Field);
677 if (DIE.isInvalid()) {
678 hadError = true;
679 return;
680 }
681 SemaRef.checkInitializerLifetime(MemberEntity, DIE.get());
682 if (Init < NumInits)
683 ILE->setInit(Init, DIE.get());
684 else {
685 ILE->updateInit(SemaRef.Context, Init, DIE.get());
686 RequiresSecondPass = true;
687 }
688 return;
689 }
690
691 if (Field->getType()->isReferenceType()) {
692 if (!VerifyOnly) {
693 // C++ [dcl.init.aggr]p9:
694 // If an incomplete or empty initializer-list leaves a
695 // member of reference type uninitialized, the program is
696 // ill-formed.
697 SemaRef.Diag(Loc, diag::err_init_reference_member_uninitialized)
698 << Field->getType()
699 << ILE->getSyntacticForm()->getSourceRange();
700 SemaRef.Diag(Field->getLocation(),
701 diag::note_uninit_reference_member);
702 }
703 hadError = true;
704 return;
705 }
706
707 ExprResult MemberInit = PerformEmptyInit(Loc, MemberEntity);
708 if (MemberInit.isInvalid()) {
709 hadError = true;
710 return;
711 }
712
713 if (hadError || VerifyOnly) {
714 // Do nothing
715 } else if (Init < NumInits) {
716 ILE->setInit(Init, MemberInit.getAs<Expr>());
717 } else if (!isa<ImplicitValueInitExpr>(MemberInit.get())) {
718 // Empty initialization requires a constructor call, so
719 // extend the initializer list to include the constructor
720 // call and make a note that we'll need to take another pass
721 // through the initializer list.
722 ILE->updateInit(SemaRef.Context, Init, MemberInit.getAs<Expr>());
723 RequiresSecondPass = true;
724 }
725 } else if (InitListExpr *InnerILE
726 = dyn_cast<InitListExpr>(ILE->getInit(Init))) {
727 FillInEmptyInitializations(MemberEntity, InnerILE,
728 RequiresSecondPass, ILE, Init, FillWithNoInit);
729 } else if (DesignatedInitUpdateExpr *InnerDIUE =
730 dyn_cast<DesignatedInitUpdateExpr>(ILE->getInit(Init))) {
731 FillInEmptyInitializations(MemberEntity, InnerDIUE->getUpdater(),
732 RequiresSecondPass, ILE, Init,
733 /*FillWithNoInit =*/true);
734 }
735}
736
737/// Recursively replaces NULL values within the given initializer list
738/// with expressions that perform value-initialization of the
739/// appropriate type, and finish off the InitListExpr formation.
740void
741InitListChecker::FillInEmptyInitializations(const InitializedEntity &Entity,
742 InitListExpr *ILE,
743 bool &RequiresSecondPass,
744 InitListExpr *OuterILE,
745 unsigned OuterIndex,
746 bool FillWithNoInit) {
747 assert((ILE->getType() != SemaRef.Context.VoidTy) &&((void)0)
748 "Should not have void type")((void)0);
749
750 // We don't need to do any checks when just filling NoInitExprs; that can't
751 // fail.
752 if (FillWithNoInit && VerifyOnly)
753 return;
754
755 // If this is a nested initializer list, we might have changed its contents
756 // (and therefore some of its properties, such as instantiation-dependence)
757 // while filling it in. Inform the outer initializer list so that its state
758 // can be updated to match.
759 // FIXME: We should fully build the inner initializers before constructing
760 // the outer InitListExpr instead of mutating AST nodes after they have
761 // been used as subexpressions of other nodes.
762 struct UpdateOuterILEWithUpdatedInit {
763 InitListExpr *Outer;
764 unsigned OuterIndex;
765 ~UpdateOuterILEWithUpdatedInit() {
766 if (Outer)
767 Outer->setInit(OuterIndex, Outer->getInit(OuterIndex));
768 }
769 } UpdateOuterRAII = {OuterILE, OuterIndex};
770
771 // A transparent ILE is not performing aggregate initialization and should
772 // not be filled in.
773 if (ILE->isTransparent())
774 return;
775
776 if (const RecordType *RType = ILE->getType()->getAs<RecordType>()) {
777 const RecordDecl *RDecl = RType->getDecl();
778 if (RDecl->isUnion() && ILE->getInitializedFieldInUnion())
779 FillInEmptyInitForField(0, ILE->getInitializedFieldInUnion(),
780 Entity, ILE, RequiresSecondPass, FillWithNoInit);
781 else if (RDecl->isUnion() && isa<CXXRecordDecl>(RDecl) &&
782 cast<CXXRecordDecl>(RDecl)->hasInClassInitializer()) {
783 for (auto *Field : RDecl->fields()) {
784 if (Field->hasInClassInitializer()) {
785 FillInEmptyInitForField(0, Field, Entity, ILE, RequiresSecondPass,
786 FillWithNoInit);
787 break;
788 }
789 }
790 } else {
791 // The fields beyond ILE->getNumInits() are default initialized, so in
792 // order to leave them uninitialized, the ILE is expanded and the extra
793 // fields are then filled with NoInitExpr.
794 unsigned NumElems = numStructUnionElements(ILE->getType());
795 if (RDecl->hasFlexibleArrayMember())
796 ++NumElems;
797 if (!VerifyOnly && ILE->getNumInits() < NumElems)
798 ILE->resizeInits(SemaRef.Context, NumElems);
799
800 unsigned Init = 0;
801
802 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RDecl)) {
803 for (auto &Base : CXXRD->bases()) {
804 if (hadError)
805 return;
806
807 FillInEmptyInitForBase(Init, Base, Entity, ILE, RequiresSecondPass,
808 FillWithNoInit);
809 ++Init;
810 }
811 }
812
813 for (auto *Field : RDecl->fields()) {
814 if (Field->isUnnamedBitfield())
815 continue;
816
817 if (hadError)
818 return;
819
820 FillInEmptyInitForField(Init, Field, Entity, ILE, RequiresSecondPass,
821 FillWithNoInit);
822 if (hadError)
823 return;
824
825 ++Init;
826
827 // Only look at the first initialization of a union.
828 if (RDecl->isUnion())
829 break;
830 }
831 }
832
833 return;
834 }
835
836 QualType ElementType;
837
838 InitializedEntity ElementEntity = Entity;
839 unsigned NumInits = ILE->getNumInits();
840 unsigned NumElements = NumInits;
841 if (const ArrayType *AType = SemaRef.Context.getAsArrayType(ILE->getType())) {
842 ElementType = AType->getElementType();
843 if (const auto *CAType = dyn_cast<ConstantArrayType>(AType))
844 NumElements = CAType->getSize().getZExtValue();
845 // For an array new with an unknown bound, ask for one additional element
846 // in order to populate the array filler.
847 if (Entity.isVariableLengthArrayNew())
848 ++NumElements;
849 ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context,
850 0, Entity);
851 } else if (const VectorType *VType = ILE->getType()->getAs<VectorType>()) {
852 ElementType = VType->getElementType();
853 NumElements = VType->getNumElements();
854 ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context,
855 0, Entity);
856 } else
857 ElementType = ILE->getType();
858
859 bool SkipEmptyInitChecks = false;
860 for (unsigned Init = 0; Init != NumElements; ++Init) {
861 if (hadError)
862 return;
863
864 if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement ||
865 ElementEntity.getKind() == InitializedEntity::EK_VectorElement)
866 ElementEntity.setElementIndex(Init);
867
868 if (Init >= NumInits && (ILE->hasArrayFiller() || SkipEmptyInitChecks))
869 return;
870
871 Expr *InitExpr = (Init < NumInits ? ILE->getInit(Init) : nullptr);
872 if (!InitExpr && Init < NumInits && ILE->hasArrayFiller())
873 ILE->setInit(Init, ILE->getArrayFiller());
874 else if (!InitExpr && !ILE->hasArrayFiller()) {
875 // In VerifyOnly mode, there's no point performing empty initialization
876 // more than once.
877 if (SkipEmptyInitChecks)
878 continue;
879
880 Expr *Filler = nullptr;
881
882 if (FillWithNoInit)
883 Filler = new (SemaRef.Context) NoInitExpr(ElementType);
884 else {
885 ExprResult ElementInit =
886 PerformEmptyInit(ILE->getEndLoc(), ElementEntity);
887 if (ElementInit.isInvalid()) {
888 hadError = true;
889 return;
890 }
891
892 Filler = ElementInit.getAs<Expr>();
893 }
894
895 if (hadError) {
896 // Do nothing
897 } else if (VerifyOnly) {
898 SkipEmptyInitChecks = true;
899 } else if (Init < NumInits) {
900 // For arrays, just set the expression used for value-initialization
901 // of the "holes" in the array.
902 if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement)
903 ILE->setArrayFiller(Filler);
904 else
905 ILE->setInit(Init, Filler);
906 } else {
907 // For arrays, just set the expression used for value-initialization
908 // of the rest of elements and exit.
909 if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement) {
910 ILE->setArrayFiller(Filler);
911 return;
912 }
913
914 if (!isa<ImplicitValueInitExpr>(Filler) && !isa<NoInitExpr>(Filler)) {
915 // Empty initialization requires a constructor call, so
916 // extend the initializer list to include the constructor
917 // call and make a note that we'll need to take another pass
918 // through the initializer list.
919 ILE->updateInit(SemaRef.Context, Init, Filler);
920 RequiresSecondPass = true;
921 }
922 }
923 } else if (InitListExpr *InnerILE
924 = dyn_cast_or_null<InitListExpr>(InitExpr)) {
925 FillInEmptyInitializations(ElementEntity, InnerILE, RequiresSecondPass,
926 ILE, Init, FillWithNoInit);
927 } else if (DesignatedInitUpdateExpr *InnerDIUE =
928 dyn_cast_or_null<DesignatedInitUpdateExpr>(InitExpr)) {
929 FillInEmptyInitializations(ElementEntity, InnerDIUE->getUpdater(),
930 RequiresSecondPass, ILE, Init,
931 /*FillWithNoInit =*/true);
932 }
933 }
934}
935
936static bool hasAnyDesignatedInits(const InitListExpr *IL) {
937 for (const Stmt *Init : *IL)
938 if (Init && isa<DesignatedInitExpr>(Init))
939 return true;
940 return false;
941}
942
943InitListChecker::InitListChecker(Sema &S, const InitializedEntity &Entity,
944 InitListExpr *IL, QualType &T, bool VerifyOnly,
945 bool TreatUnavailableAsInvalid,
946 bool InOverloadResolution)
947 : SemaRef(S), VerifyOnly(VerifyOnly),
948 TreatUnavailableAsInvalid(TreatUnavailableAsInvalid),
949 InOverloadResolution(InOverloadResolution) {
950 if (!VerifyOnly || hasAnyDesignatedInits(IL)) {
951 FullyStructuredList =
952 createInitListExpr(T, IL->getSourceRange(), IL->getNumInits());
953
954 // FIXME: Check that IL isn't already the semantic form of some other
955 // InitListExpr. If it is, we'd create a broken AST.
956 if (!VerifyOnly)
957 FullyStructuredList->setSyntacticForm(IL);
958 }
959
960 CheckExplicitInitList(Entity, IL, T, FullyStructuredList,
961 /*TopLevelObject=*/true);
962
963 if (!hadError && FullyStructuredList) {
964 bool RequiresSecondPass = false;
965 FillInEmptyInitializations(Entity, FullyStructuredList, RequiresSecondPass,
966 /*OuterILE=*/nullptr, /*OuterIndex=*/0);
967 if (RequiresSecondPass && !hadError)
968 FillInEmptyInitializations(Entity, FullyStructuredList,
969 RequiresSecondPass, nullptr, 0);
970 }
971 if (hadError && FullyStructuredList)
972 FullyStructuredList->markError();
973}
974
975int InitListChecker::numArrayElements(QualType DeclType) {
976 // FIXME: use a proper constant
977 int maxElements = 0x7FFFFFFF;
978 if (const ConstantArrayType *CAT =
979 SemaRef.Context.getAsConstantArrayType(DeclType)) {
980 maxElements = static_cast<int>(CAT->getSize().getZExtValue());
981 }
982 return maxElements;
983}
984
985int InitListChecker::numStructUnionElements(QualType DeclType) {
986 RecordDecl *structDecl = DeclType->castAs<RecordType>()->getDecl();
987 int InitializableMembers = 0;
988 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(structDecl))
989 InitializableMembers += CXXRD->getNumBases();
990 for (const auto *Field : structDecl->fields())
991 if (!Field->isUnnamedBitfield())
992 ++InitializableMembers;
993
994 if (structDecl->isUnion())
995 return std::min(InitializableMembers, 1);
996 return InitializableMembers - structDecl->hasFlexibleArrayMember();
997}
998
999/// Determine whether Entity is an entity for which it is idiomatic to elide
1000/// the braces in aggregate initialization.
1001static bool isIdiomaticBraceElisionEntity(const InitializedEntity &Entity) {
1002 // Recursive initialization of the one and only field within an aggregate
1003 // class is considered idiomatic. This case arises in particular for
1004 // initialization of std::array, where the C++ standard suggests the idiom of
1005 //
1006 // std::array<T, N> arr = {1, 2, 3};
1007 //
1008 // (where std::array is an aggregate struct containing a single array field.
1009
1010 if (!Entity.getParent())
1011 return false;
1012
1013 // Allows elide brace initialization for aggregates with empty base.
1014 if (Entity.getKind() == InitializedEntity::EK_Base) {
1015 auto *ParentRD =
1016 Entity.getParent()->getType()->castAs<RecordType>()->getDecl();
1017 CXXRecordDecl *CXXRD = cast<CXXRecordDecl>(ParentRD);
1018 return CXXRD->getNumBases() == 1 && CXXRD->field_empty();
1019 }
1020
1021 // Allow brace elision if the only subobject is a field.
1022 if (Entity.getKind() == InitializedEntity::EK_Member) {
1023 auto *ParentRD =
1024 Entity.getParent()->getType()->castAs<RecordType>()->getDecl();
1025 if (CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(ParentRD)) {
1026 if (CXXRD->getNumBases()) {
1027 return false;
1028 }
1029 }
1030 auto FieldIt = ParentRD->field_begin();
1031 assert(FieldIt != ParentRD->field_end() &&((void)0)
1032 "no fields but have initializer for member?")((void)0);
1033 return ++FieldIt == ParentRD->field_end();
1034 }
1035
1036 return false;
1037}
1038
1039/// Check whether the range of the initializer \p ParentIList from element
1040/// \p Index onwards can be used to initialize an object of type \p T. Update
1041/// \p Index to indicate how many elements of the list were consumed.
1042///
1043/// This also fills in \p StructuredList, from element \p StructuredIndex
1044/// onwards, with the fully-braced, desugared form of the initialization.
1045void InitListChecker::CheckImplicitInitList(const InitializedEntity &Entity,
1046 InitListExpr *ParentIList,
1047 QualType T, unsigned &Index,
1048 InitListExpr *StructuredList,
1049 unsigned &StructuredIndex) {
1050 int maxElements = 0;
1051
1052 if (T->isArrayType())
1053 maxElements = numArrayElements(T);
1054 else if (T->isRecordType())
1055 maxElements = numStructUnionElements(T);
1056 else if (T->isVectorType())
1057 maxElements = T->castAs<VectorType>()->getNumElements();
1058 else
1059 llvm_unreachable("CheckImplicitInitList(): Illegal type")__builtin_unreachable();
1060
1061 if (maxElements == 0) {
1062 if (!VerifyOnly)
1063 SemaRef.Diag(ParentIList->getInit(Index)->getBeginLoc(),
1064 diag::err_implicit_empty_initializer);
1065 ++Index;
1066 hadError = true;
1067 return;
1068 }
1069
1070 // Build a structured initializer list corresponding to this subobject.
1071 InitListExpr *StructuredSubobjectInitList = getStructuredSubobjectInit(
1072 ParentIList, Index, T, StructuredList, StructuredIndex,
1073 SourceRange(ParentIList->getInit(Index)->getBeginLoc(),
1074 ParentIList->getSourceRange().getEnd()));
1075 unsigned StructuredSubobjectInitIndex = 0;
1076
1077 // Check the element types and build the structural subobject.
1078 unsigned StartIndex = Index;
1079 CheckListElementTypes(Entity, ParentIList, T,
1080 /*SubobjectIsDesignatorContext=*/false, Index,
1081 StructuredSubobjectInitList,
1082 StructuredSubobjectInitIndex);
1083
1084 if (StructuredSubobjectInitList) {
1085 StructuredSubobjectInitList->setType(T);
1086
1087 unsigned EndIndex = (Index == StartIndex? StartIndex : Index - 1);
1088 // Update the structured sub-object initializer so that it's ending
1089 // range corresponds with the end of the last initializer it used.
1090 if (EndIndex < ParentIList->getNumInits() &&
1091 ParentIList->getInit(EndIndex)) {
1092 SourceLocation EndLoc
1093 = ParentIList->getInit(EndIndex)->getSourceRange().getEnd();
1094 StructuredSubobjectInitList->setRBraceLoc(EndLoc);
1095 }
1096
1097 // Complain about missing braces.
1098 if (!VerifyOnly && (T->isArrayType() || T->isRecordType()) &&
1099 !ParentIList->isIdiomaticZeroInitializer(SemaRef.getLangOpts()) &&
1100 !isIdiomaticBraceElisionEntity(Entity)) {
1101 SemaRef.Diag(StructuredSubobjectInitList->getBeginLoc(),
1102 diag::warn_missing_braces)
1103 << StructuredSubobjectInitList->getSourceRange()
1104 << FixItHint::CreateInsertion(
1105 StructuredSubobjectInitList->getBeginLoc(), "{")
1106 << FixItHint::CreateInsertion(
1107 SemaRef.getLocForEndOfToken(
1108 StructuredSubobjectInitList->getEndLoc()),
1109 "}");
1110 }
1111
1112 // Warn if this type won't be an aggregate in future versions of C++.
1113 auto *CXXRD = T->getAsCXXRecordDecl();
1114 if (!VerifyOnly && CXXRD && CXXRD->hasUserDeclaredConstructor()) {
1115 SemaRef.Diag(StructuredSubobjectInitList->getBeginLoc(),
1116 diag::warn_cxx20_compat_aggregate_init_with_ctors)
1117 << StructuredSubobjectInitList->getSourceRange() << T;
1118 }
1119 }
1120}
1121
1122/// Warn that \p Entity was of scalar type and was initialized by a
1123/// single-element braced initializer list.
1124static void warnBracedScalarInit(Sema &S, const InitializedEntity &Entity,
1125 SourceRange Braces) {
1126 // Don't warn during template instantiation. If the initialization was
1127 // non-dependent, we warned during the initial parse; otherwise, the
1128 // type might not be scalar in some uses of the template.
1129 if (S.inTemplateInstantiation())
1130 return;
1131
1132 unsigned DiagID = 0;
1133
1134 switch (Entity.getKind()) {
1135 case InitializedEntity::EK_VectorElement:
1136 case InitializedEntity::EK_ComplexElement:
1137 case InitializedEntity::EK_ArrayElement:
1138 case InitializedEntity::EK_Parameter:
1139 case InitializedEntity::EK_Parameter_CF_Audited:
1140 case InitializedEntity::EK_TemplateParameter:
1141 case InitializedEntity::EK_Result:
1142 // Extra braces here are suspicious.
1143 DiagID = diag::warn_braces_around_init;
1144 break;
1145
1146 case InitializedEntity::EK_Member:
1147 // Warn on aggregate initialization but not on ctor init list or
1148 // default member initializer.
1149 if (Entity.getParent())
1150 DiagID = diag::warn_braces_around_init;
1151 break;
1152
1153 case InitializedEntity::EK_Variable:
1154 case InitializedEntity::EK_LambdaCapture:
1155 // No warning, might be direct-list-initialization.
1156 // FIXME: Should we warn for copy-list-initialization in these cases?
1157 break;
1158
1159 case InitializedEntity::EK_New:
1160 case InitializedEntity::EK_Temporary:
1161 case InitializedEntity::EK_CompoundLiteralInit:
1162 // No warning, braces are part of the syntax of the underlying construct.
1163 break;
1164
1165 case InitializedEntity::EK_RelatedResult:
1166 // No warning, we already warned when initializing the result.
1167 break;
1168
1169 case InitializedEntity::EK_Exception:
1170 case InitializedEntity::EK_Base:
1171 case InitializedEntity::EK_Delegating:
1172 case InitializedEntity::EK_BlockElement:
1173 case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
1174 case InitializedEntity::EK_Binding:
1175 case InitializedEntity::EK_StmtExprResult:
1176 llvm_unreachable("unexpected braced scalar init")__builtin_unreachable();
1177 }
1178
1179 if (DiagID) {
1180 S.Diag(Braces.getBegin(), DiagID)
1181 << Entity.getType()->isSizelessBuiltinType() << Braces
1182 << FixItHint::CreateRemoval(Braces.getBegin())
1183 << FixItHint::CreateRemoval(Braces.getEnd());
1184 }
1185}
1186
1187/// Check whether the initializer \p IList (that was written with explicit
1188/// braces) can be used to initialize an object of type \p T.
1189///
1190/// This also fills in \p StructuredList with the fully-braced, desugared
1191/// form of the initialization.
1192void InitListChecker::CheckExplicitInitList(const InitializedEntity &Entity,
1193 InitListExpr *IList, QualType &T,
1194 InitListExpr *StructuredList,
1195 bool TopLevelObject) {
1196 unsigned Index = 0, StructuredIndex = 0;
1197 CheckListElementTypes(Entity, IList, T, /*SubobjectIsDesignatorContext=*/true,
1198 Index, StructuredList, StructuredIndex, TopLevelObject);
1199 if (StructuredList) {
1200 QualType ExprTy = T;
1201 if (!ExprTy->isArrayType())
1202 ExprTy = ExprTy.getNonLValueExprType(SemaRef.Context);
1203 if (!VerifyOnly)
1204 IList->setType(ExprTy);
1205 StructuredList->setType(ExprTy);
1206 }
1207 if (hadError)
1208 return;
1209
1210 // Don't complain for incomplete types, since we'll get an error elsewhere.
1211 if (Index < IList->getNumInits() && !T->isIncompleteType()) {
1212 // We have leftover initializers
1213 bool ExtraInitsIsError = SemaRef.getLangOpts().CPlusPlus ||
1214 (SemaRef.getLangOpts().OpenCL && T->isVectorType());
1215 hadError = ExtraInitsIsError;
1216 if (VerifyOnly) {
1217 return;
1218 } else if (StructuredIndex == 1 &&
1219 IsStringInit(StructuredList->getInit(0), T, SemaRef.Context) ==
1220 SIF_None) {
1221 unsigned DK =
1222 ExtraInitsIsError
1223 ? diag::err_excess_initializers_in_char_array_initializer
1224 : diag::ext_excess_initializers_in_char_array_initializer;
1225 SemaRef.Diag(IList->getInit(Index)->getBeginLoc(), DK)
1226 << IList->getInit(Index)->getSourceRange();
1227 } else if (T->isSizelessBuiltinType()) {
1228 unsigned DK = ExtraInitsIsError
1229 ? diag::err_excess_initializers_for_sizeless_type
1230 : diag::ext_excess_initializers_for_sizeless_type;
1231 SemaRef.Diag(IList->getInit(Index)->getBeginLoc(), DK)
1232 << T << IList->getInit(Index)->getSourceRange();
1233 } else {
1234 int initKind = T->isArrayType() ? 0 :
1235 T->isVectorType() ? 1 :
1236 T->isScalarType() ? 2 :
1237 T->isUnionType() ? 3 :
1238 4;
1239
1240 unsigned DK = ExtraInitsIsError ? diag::err_excess_initializers
1241 : diag::ext_excess_initializers;
1242 SemaRef.Diag(IList->getInit(Index)->getBeginLoc(), DK)
1243 << initKind << IList->getInit(Index)->getSourceRange();
1244 }
1245 }
1246
1247 if (!VerifyOnly) {
1248 if (T->isScalarType() && IList->getNumInits() == 1 &&
1249 !isa<InitListExpr>(IList->getInit(0)))
1250 warnBracedScalarInit(SemaRef, Entity, IList->getSourceRange());
1251
1252 // Warn if this is a class type that won't be an aggregate in future
1253 // versions of C++.
1254 auto *CXXRD = T->getAsCXXRecordDecl();
1255 if (CXXRD && CXXRD->hasUserDeclaredConstructor()) {
1256 // Don't warn if there's an equivalent default constructor that would be
1257 // used instead.
1258 bool HasEquivCtor = false;
1259 if (IList->getNumInits() == 0) {
1260 auto *CD = SemaRef.LookupDefaultConstructor(CXXRD);
1261 HasEquivCtor = CD && !CD->isDeleted();
1262 }
1263
1264 if (!HasEquivCtor) {
1265 SemaRef.Diag(IList->getBeginLoc(),
1266 diag::warn_cxx20_compat_aggregate_init_with_ctors)
1267 << IList->getSourceRange() << T;
1268 }
1269 }
1270 }
1271}
1272
1273void InitListChecker::CheckListElementTypes(const InitializedEntity &Entity,
1274 InitListExpr *IList,
1275 QualType &DeclType,
1276 bool SubobjectIsDesignatorContext,
1277 unsigned &Index,
1278 InitListExpr *StructuredList,
1279 unsigned &StructuredIndex,
1280 bool TopLevelObject) {
1281 if (DeclType->isAnyComplexType() && SubobjectIsDesignatorContext) {
1282 // Explicitly braced initializer for complex type can be real+imaginary
1283 // parts.
1284 CheckComplexType(Entity, IList, DeclType, Index,
1285 StructuredList, StructuredIndex);
1286 } else if (DeclType->isScalarType()) {
1287 CheckScalarType(Entity, IList, DeclType, Index,
1288 StructuredList, StructuredIndex);
1289 } else if (DeclType->isVectorType()) {
1290 CheckVectorType(Entity, IList, DeclType, Index,
1291 StructuredList, StructuredIndex);
1292 } else if (DeclType->isRecordType()) {
1293 assert(DeclType->isAggregateType() &&((void)0)
1294 "non-aggregate records should be handed in CheckSubElementType")((void)0);
1295 RecordDecl *RD = DeclType->castAs<RecordType>()->getDecl();
1296 auto Bases =
1297 CXXRecordDecl::base_class_range(CXXRecordDecl::base_class_iterator(),
1298 CXXRecordDecl::base_class_iterator());
1299 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD))
1300 Bases = CXXRD->bases();
1301 CheckStructUnionTypes(Entity, IList, DeclType, Bases, RD->field_begin(),
1302 SubobjectIsDesignatorContext, Index, StructuredList,
1303 StructuredIndex, TopLevelObject);
1304 } else if (DeclType->isArrayType()) {
1305 llvm::APSInt Zero(
1306 SemaRef.Context.getTypeSize(SemaRef.Context.getSizeType()),
1307 false);
1308 CheckArrayType(Entity, IList, DeclType, Zero,
1309 SubobjectIsDesignatorContext, Index,
1310 StructuredList, StructuredIndex);
1311 } else if (DeclType->isVoidType() || DeclType->isFunctionType()) {
1312 // This type is invalid, issue a diagnostic.
1313 ++Index;
1314 if (!VerifyOnly)
1315 SemaRef.Diag(IList->getBeginLoc(), diag::err_illegal_initializer_type)
1316 << DeclType;
1317 hadError = true;
1318 } else if (DeclType->isReferenceType()) {
1319 CheckReferenceType(Entity, IList, DeclType, Index,
1320 StructuredList, StructuredIndex);
1321 } else if (DeclType->isObjCObjectType()) {
1322 if (!VerifyOnly)
1323 SemaRef.Diag(IList->getBeginLoc(), diag::err_init_objc_class) << DeclType;
1324 hadError = true;
1325 } else if (DeclType->isOCLIntelSubgroupAVCType() ||
1326 DeclType->isSizelessBuiltinType()) {
1327 // Checks for scalar type are sufficient for these types too.
1328 CheckScalarType(Entity, IList, DeclType, Index, StructuredList,
1329 StructuredIndex);
1330 } else {
1331 if (!VerifyOnly)
1332 SemaRef.Diag(IList->getBeginLoc(), diag::err_illegal_initializer_type)
1333 << DeclType;
1334 hadError = true;
1335 }
1336}
1337
1338void InitListChecker::CheckSubElementType(const InitializedEntity &Entity,
1339 InitListExpr *IList,
1340 QualType ElemType,
1341 unsigned &Index,
1342 InitListExpr *StructuredList,
1343 unsigned &StructuredIndex,
1344 bool DirectlyDesignated) {
1345 Expr *expr = IList->getInit(Index);
1346
1347 if (ElemType->isReferenceType())
1348 return CheckReferenceType(Entity, IList, ElemType, Index,
1349 StructuredList, StructuredIndex);
1350
1351 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) {
1352 if (SubInitList->getNumInits() == 1 &&
1353 IsStringInit(SubInitList->getInit(0), ElemType, SemaRef.Context) ==
1354 SIF_None) {
1355 // FIXME: It would be more faithful and no less correct to include an
1356 // InitListExpr in the semantic form of the initializer list in this case.
1357 expr = SubInitList->getInit(0);
1358 }
1359 // Nested aggregate initialization and C++ initialization are handled later.
1360 } else if (isa<ImplicitValueInitExpr>(expr)) {
1361 // This happens during template instantiation when we see an InitListExpr
1362 // that we've already checked once.
1363 assert(SemaRef.Context.hasSameType(expr->getType(), ElemType) &&((void)0)
1364 "found implicit initialization for the wrong type")((void)0);
1365 UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
1366 ++Index;
1367 return;
1368 }
1369
1370 if (SemaRef.getLangOpts().CPlusPlus || isa<InitListExpr>(expr)) {
1371 // C++ [dcl.init.aggr]p2:
1372 // Each member is copy-initialized from the corresponding
1373 // initializer-clause.
1374
1375 // FIXME: Better EqualLoc?
1376 InitializationKind Kind =
1377 InitializationKind::CreateCopy(expr->getBeginLoc(), SourceLocation());
1378
1379 // Vector elements can be initialized from other vectors in which case
1380 // we need initialization entity with a type of a vector (and not a vector
1381 // element!) initializing multiple vector elements.
1382 auto TmpEntity =
1383 (ElemType->isExtVectorType() && !Entity.getType()->isExtVectorType())
1384 ? InitializedEntity::InitializeTemporary(ElemType)
1385 : Entity;
1386
1387 InitializationSequence Seq(SemaRef, TmpEntity, Kind, expr,
1388 /*TopLevelOfInitList*/ true);
1389
1390 // C++14 [dcl.init.aggr]p13:
1391 // If the assignment-expression can initialize a member, the member is
1392 // initialized. Otherwise [...] brace elision is assumed
1393 //
1394 // Brace elision is never performed if the element is not an
1395 // assignment-expression.
1396 if (Seq || isa<InitListExpr>(expr)) {
1397 if (!VerifyOnly) {
1398 ExprResult Result = Seq.Perform(SemaRef, TmpEntity, Kind, expr);
1399 if (Result.isInvalid())
1400 hadError = true;
1401
1402 UpdateStructuredListElement(StructuredList, StructuredIndex,
1403 Result.getAs<Expr>());
1404 } else if (!Seq) {
1405 hadError = true;
1406 } else if (StructuredList) {
1407 UpdateStructuredListElement(StructuredList, StructuredIndex,
1408 getDummyInit());
1409 }
1410 ++Index;
1411 return;
1412 }
1413
1414 // Fall through for subaggregate initialization
1415 } else if (ElemType->isScalarType() || ElemType->isAtomicType()) {
1416 // FIXME: Need to handle atomic aggregate types with implicit init lists.
1417 return CheckScalarType(Entity, IList, ElemType, Index,
1418 StructuredList, StructuredIndex);
1419 } else if (const ArrayType *arrayType =
1420 SemaRef.Context.getAsArrayType(ElemType)) {
1421 // arrayType can be incomplete if we're initializing a flexible
1422 // array member. There's nothing we can do with the completed
1423 // type here, though.
1424
1425 if (IsStringInit(expr, arrayType, SemaRef.Context) == SIF_None) {
1426 // FIXME: Should we do this checking in verify-only mode?
1427 if (!VerifyOnly)
1428 CheckStringInit(expr, ElemType, arrayType, SemaRef);
1429 if (StructuredList)
1430 UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
1431 ++Index;
1432 return;
1433 }
1434
1435 // Fall through for subaggregate initialization.
1436
1437 } else {
1438 assert((ElemType->isRecordType() || ElemType->isVectorType() ||((void)0)
1439 ElemType->isOpenCLSpecificType()) && "Unexpected type")((void)0);
1440
1441 // C99 6.7.8p13:
1442 //
1443 // The initializer for a structure or union object that has
1444 // automatic storage duration shall be either an initializer
1445 // list as described below, or a single expression that has
1446 // compatible structure or union type. In the latter case, the
1447 // initial value of the object, including unnamed members, is
1448 // that of the expression.
1449 ExprResult ExprRes = expr;
1450 if (SemaRef.CheckSingleAssignmentConstraints(
1451 ElemType, ExprRes, !VerifyOnly) != Sema::Incompatible) {
1452 if (ExprRes.isInvalid())
1453 hadError = true;
1454 else {
1455 ExprRes = SemaRef.DefaultFunctionArrayLvalueConversion(ExprRes.get());
1456 if (ExprRes.isInvalid())
1457 hadError = true;
1458 }
1459 UpdateStructuredListElement(StructuredList, StructuredIndex,
1460 ExprRes.getAs<Expr>());
1461 ++Index;
1462 return;
1463 }
1464 ExprRes.get();
1465 // Fall through for subaggregate initialization
1466 }
1467
1468 // C++ [dcl.init.aggr]p12:
1469 //
1470 // [...] Otherwise, if the member is itself a non-empty
1471 // subaggregate, brace elision is assumed and the initializer is
1472 // considered for the initialization of the first member of
1473 // the subaggregate.
1474 // OpenCL vector initializer is handled elsewhere.
1475 if ((!SemaRef.getLangOpts().OpenCL && ElemType->isVectorType()) ||
1476 ElemType->isAggregateType()) {
1477 CheckImplicitInitList(Entity, IList, ElemType, Index, StructuredList,
1478 StructuredIndex);
1479 ++StructuredIndex;
1480
1481 // In C++20, brace elision is not permitted for a designated initializer.
1482 if (DirectlyDesignated && SemaRef.getLangOpts().CPlusPlus && !hadError) {
1483 if (InOverloadResolution)
1484 hadError = true;
1485 if (!VerifyOnly) {
1486 SemaRef.Diag(expr->getBeginLoc(),
1487 diag::ext_designated_init_brace_elision)
1488 << expr->getSourceRange()
1489 << FixItHint::CreateInsertion(expr->getBeginLoc(), "{")
1490 << FixItHint::CreateInsertion(
1491 SemaRef.getLocForEndOfToken(expr->getEndLoc()), "}");
1492 }
1493 }
1494 } else {
1495 if (!VerifyOnly) {
1496 // We cannot initialize this element, so let PerformCopyInitialization
1497 // produce the appropriate diagnostic. We already checked that this
1498 // initialization will fail.
1499 ExprResult Copy =
1500 SemaRef.PerformCopyInitialization(Entity, SourceLocation(), expr,
1501 /*TopLevelOfInitList=*/true);
1502 (void)Copy;
1503 assert(Copy.isInvalid() &&((void)0)
1504 "expected non-aggregate initialization to fail")((void)0);
1505 }
1506 hadError = true;
1507 ++Index;
1508 ++StructuredIndex;
1509 }
1510}
1511
1512void InitListChecker::CheckComplexType(const InitializedEntity &Entity,
1513 InitListExpr *IList, QualType DeclType,
1514 unsigned &Index,
1515 InitListExpr *StructuredList,
1516 unsigned &StructuredIndex) {
1517 assert(Index == 0 && "Index in explicit init list must be zero")((void)0);
1518
1519 // As an extension, clang supports complex initializers, which initialize
1520 // a complex number component-wise. When an explicit initializer list for
1521 // a complex number contains two two initializers, this extension kicks in:
1522 // it exepcts the initializer list to contain two elements convertible to
1523 // the element type of the complex type. The first element initializes
1524 // the real part, and the second element intitializes the imaginary part.
1525
1526 if (IList->getNumInits() != 2)
1527 return CheckScalarType(Entity, IList, DeclType, Index, StructuredList,
1528 StructuredIndex);
1529
1530 // This is an extension in C. (The builtin _Complex type does not exist
1531 // in the C++ standard.)
1532 if (!SemaRef.getLangOpts().CPlusPlus && !VerifyOnly)
1533 SemaRef.Diag(IList->getBeginLoc(), diag::ext_complex_component_init)
1534 << IList->getSourceRange();
1535
1536 // Initialize the complex number.
1537 QualType elementType = DeclType->castAs<ComplexType>()->getElementType();
1538 InitializedEntity ElementEntity =
1539 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
1540
1541 for (unsigned i = 0; i < 2; ++i) {
1542 ElementEntity.setElementIndex(Index);
1543 CheckSubElementType(ElementEntity, IList, elementType, Index,
1544 StructuredList, StructuredIndex);
1545 }
1546}
1547
1548void InitListChecker::CheckScalarType(const InitializedEntity &Entity,
1549 InitListExpr *IList, QualType DeclType,
1550 unsigned &Index,
1551 InitListExpr *StructuredList,
1552 unsigned &StructuredIndex) {
1553 if (Index >= IList->getNumInits()) {
1554 if (!VerifyOnly) {
1555 if (DeclType->isSizelessBuiltinType())
1556 SemaRef.Diag(IList->getBeginLoc(),
1557 SemaRef.getLangOpts().CPlusPlus11
1558 ? diag::warn_cxx98_compat_empty_sizeless_initializer
1559 : diag::err_empty_sizeless_initializer)
1560 << DeclType << IList->getSourceRange();
1561 else
1562 SemaRef.Diag(IList->getBeginLoc(),
1563 SemaRef.getLangOpts().CPlusPlus11
1564 ? diag::warn_cxx98_compat_empty_scalar_initializer
1565 : diag::err_empty_scalar_initializer)
1566 << IList->getSourceRange();
1567 }
1568 hadError = !SemaRef.getLangOpts().CPlusPlus11;
1569 ++Index;
1570 ++StructuredIndex;
1571 return;
1572 }
1573
1574 Expr *expr = IList->getInit(Index);
1575 if (InitListExpr *SubIList = dyn_cast<InitListExpr>(expr)) {
1576 // FIXME: This is invalid, and accepting it causes overload resolution
1577 // to pick the wrong overload in some corner cases.
1578 if (!VerifyOnly)
1579 SemaRef.Diag(SubIList->getBeginLoc(), diag::ext_many_braces_around_init)
1580 << DeclType->isSizelessBuiltinType() << SubIList->getSourceRange();
1581
1582 CheckScalarType(Entity, SubIList, DeclType, Index, StructuredList,
1583 StructuredIndex);
1584 return;
1585 } else if (isa<DesignatedInitExpr>(expr)) {
1586 if (!VerifyOnly)
1587 SemaRef.Diag(expr->getBeginLoc(),
1588 diag::err_designator_for_scalar_or_sizeless_init)
1589 << DeclType->isSizelessBuiltinType() << DeclType
1590 << expr->getSourceRange();
1591 hadError = true;
1592 ++Index;
1593 ++StructuredIndex;
1594 return;
1595 }
1596
1597 ExprResult Result;
1598 if (VerifyOnly) {
1599 if (SemaRef.CanPerformCopyInitialization(Entity, expr))
1600 Result = getDummyInit();
1601 else
1602 Result = ExprError();
1603 } else {
1604 Result =
1605 SemaRef.PerformCopyInitialization(Entity, expr->getBeginLoc(), expr,
1606 /*TopLevelOfInitList=*/true);
1607 }
1608
1609 Expr *ResultExpr = nullptr;
1610
1611 if (Result.isInvalid())
1612 hadError = true; // types weren't compatible.
1613 else {
1614 ResultExpr = Result.getAs<Expr>();
1615
1616 if (ResultExpr != expr && !VerifyOnly) {
1617 // The type was promoted, update initializer list.
1618 // FIXME: Why are we updating the syntactic init list?
1619 IList->setInit(Index, ResultExpr);
1620 }
1621 }
1622 UpdateStructuredListElement(StructuredList, StructuredIndex, ResultExpr);
1623 ++Index;
1624}
1625
1626void InitListChecker::CheckReferenceType(const InitializedEntity &Entity,
1627 InitListExpr *IList, QualType DeclType,
1628 unsigned &Index,
1629 InitListExpr *StructuredList,
1630 unsigned &StructuredIndex) {
1631 if (Index >= IList->getNumInits()) {
1632 // FIXME: It would be wonderful if we could point at the actual member. In
1633 // general, it would be useful to pass location information down the stack,
1634 // so that we know the location (or decl) of the "current object" being
1635 // initialized.
1636 if (!VerifyOnly)
1637 SemaRef.Diag(IList->getBeginLoc(),
1638 diag::err_init_reference_member_uninitialized)
1639 << DeclType << IList->getSourceRange();
1640 hadError = true;
1641 ++Index;
1642 ++StructuredIndex;
1643 return;
1644 }
1645
1646 Expr *expr = IList->getInit(Index);
1647 if (isa<InitListExpr>(expr) && !SemaRef.getLangOpts().CPlusPlus11) {
1648 if (!VerifyOnly)
1649 SemaRef.Diag(IList->getBeginLoc(), diag::err_init_non_aggr_init_list)
1650 << DeclType << IList->getSourceRange();
1651 hadError = true;
1652 ++Index;
1653 ++StructuredIndex;
1654 return;
1655 }
1656
1657 ExprResult Result;
1658 if (VerifyOnly) {
1659 if (SemaRef.CanPerformCopyInitialization(Entity,expr))
1660 Result = getDummyInit();
1661 else
1662 Result = ExprError();
1663 } else {
1664 Result =
1665 SemaRef.PerformCopyInitialization(Entity, expr->getBeginLoc(), expr,
1666 /*TopLevelOfInitList=*/true);
1667 }
1668
1669 if (Result.isInvalid())
1670 hadError = true;
1671
1672 expr = Result.getAs<Expr>();
1673 // FIXME: Why are we updating the syntactic init list?
1674 if (!VerifyOnly && expr)
1675 IList->setInit(Index, expr);
1676
1677 UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
1678 ++Index;
1679}
1680
1681void InitListChecker::CheckVectorType(const InitializedEntity &Entity,
1682 InitListExpr *IList, QualType DeclType,
1683 unsigned &Index,
1684 InitListExpr *StructuredList,
1685 unsigned &StructuredIndex) {
1686 const VectorType *VT = DeclType->castAs<VectorType>();
1687 unsigned maxElements = VT->getNumElements();
1688 unsigned numEltsInit = 0;
1689 QualType elementType = VT->getElementType();
1690
1691 if (Index >= IList->getNumInits()) {
1692 // Make sure the element type can be value-initialized.
1693 CheckEmptyInitializable(
1694 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity),
1695 IList->getEndLoc());
1696 return;
1697 }
1698
1699 if (!SemaRef.getLangOpts().OpenCL) {
1700 // If the initializing element is a vector, try to copy-initialize
1701 // instead of breaking it apart (which is doomed to failure anyway).
1702 Expr *Init = IList->getInit(Index);
1703 if (!isa<InitListExpr>(Init) && Init->getType()->isVectorType()) {
1704 ExprResult Result;
1705 if (VerifyOnly) {
1706 if (SemaRef.CanPerformCopyInitialization(Entity, Init))
1707 Result = getDummyInit();
1708 else
1709 Result = ExprError();
1710 } else {
1711 Result =
1712 SemaRef.PerformCopyInitialization(Entity, Init->getBeginLoc(), Init,
1713 /*TopLevelOfInitList=*/true);
1714 }
1715
1716 Expr *ResultExpr = nullptr;
1717 if (Result.isInvalid())
1718 hadError = true; // types weren't compatible.
1719 else {
1720 ResultExpr = Result.getAs<Expr>();
1721
1722 if (ResultExpr != Init && !VerifyOnly) {
1723 // The type was promoted, update initializer list.
1724 // FIXME: Why are we updating the syntactic init list?
1725 IList->setInit(Index, ResultExpr);
1726 }
1727 }
1728 UpdateStructuredListElement(StructuredList, StructuredIndex, ResultExpr);
1729 ++Index;
1730 return;
1731 }
1732
1733 InitializedEntity ElementEntity =
1734 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
1735
1736 for (unsigned i = 0; i < maxElements; ++i, ++numEltsInit) {
1737 // Don't attempt to go past the end of the init list
1738 if (Index >= IList->getNumInits()) {
1739 CheckEmptyInitializable(ElementEntity, IList->getEndLoc());
1740 break;
1741 }
1742
1743 ElementEntity.setElementIndex(Index);
1744 CheckSubElementType(ElementEntity, IList, elementType, Index,
1745 StructuredList, StructuredIndex);
1746 }
1747
1748 if (VerifyOnly)
1749 return;
1750
1751 bool isBigEndian = SemaRef.Context.getTargetInfo().isBigEndian();
1752 const VectorType *T = Entity.getType()->castAs<VectorType>();
1753 if (isBigEndian && (T->getVectorKind() == VectorType::NeonVector ||
1754 T->getVectorKind() == VectorType::NeonPolyVector)) {
1755 // The ability to use vector initializer lists is a GNU vector extension
1756 // and is unrelated to the NEON intrinsics in arm_neon.h. On little
1757 // endian machines it works fine, however on big endian machines it
1758 // exhibits surprising behaviour:
1759 //
1760 // uint32x2_t x = {42, 64};
1761 // return vget_lane_u32(x, 0); // Will return 64.
1762 //
1763 // Because of this, explicitly call out that it is non-portable.
1764 //
1765 SemaRef.Diag(IList->getBeginLoc(),
1766 diag::warn_neon_vector_initializer_non_portable);
1767
1768 const char *typeCode;
1769 unsigned typeSize = SemaRef.Context.getTypeSize(elementType);
1770
1771 if (elementType->isFloatingType())
1772 typeCode = "f";
1773 else if (elementType->isSignedIntegerType())
1774 typeCode = "s";
1775 else if (elementType->isUnsignedIntegerType())
1776 typeCode = "u";
1777 else
1778 llvm_unreachable("Invalid element type!")__builtin_unreachable();
1779
1780 SemaRef.Diag(IList->getBeginLoc(),
1781 SemaRef.Context.getTypeSize(VT) > 64
1782 ? diag::note_neon_vector_initializer_non_portable_q
1783 : diag::note_neon_vector_initializer_non_portable)
1784 << typeCode << typeSize;
1785 }
1786
1787 return;
1788 }
1789
1790 InitializedEntity ElementEntity =
1791 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
1792
1793 // OpenCL initializers allows vectors to be constructed from vectors.
1794 for (unsigned i = 0; i < maxElements; ++i) {
1795 // Don't attempt to go past the end of the init list
1796 if (Index >= IList->getNumInits())
1797 break;
1798
1799 ElementEntity.setElementIndex(Index);
1800
1801 QualType IType = IList->getInit(Index)->getType();
1802 if (!IType->isVectorType()) {
1803 CheckSubElementType(ElementEntity, IList, elementType, Index,
1804 StructuredList, StructuredIndex);
1805 ++numEltsInit;
1806 } else {
1807 QualType VecType;
1808 const VectorType *IVT = IType->castAs<VectorType>();
1809 unsigned numIElts = IVT->getNumElements();
1810
1811 if (IType->isExtVectorType())
1812 VecType = SemaRef.Context.getExtVectorType(elementType, numIElts);
1813 else
1814 VecType = SemaRef.Context.getVectorType(elementType, numIElts,
1815 IVT->getVectorKind());
1816 CheckSubElementType(ElementEntity, IList, VecType, Index,
1817 StructuredList, StructuredIndex);
1818 numEltsInit += numIElts;
1819 }
1820 }
1821
1822 // OpenCL requires all elements to be initialized.
1823 if (numEltsInit != maxElements) {
1824 if (!VerifyOnly)
1825 SemaRef.Diag(IList->getBeginLoc(),
1826 diag::err_vector_incorrect_num_initializers)
1827 << (numEltsInit < maxElements) << maxElements << numEltsInit;
1828 hadError = true;
1829 }
1830}
1831
1832/// Check if the type of a class element has an accessible destructor, and marks
1833/// it referenced. Returns true if we shouldn't form a reference to the
1834/// destructor.
1835///
1836/// Aggregate initialization requires a class element's destructor be
1837/// accessible per 11.6.1 [dcl.init.aggr]:
1838///
1839/// The destructor for each element of class type is potentially invoked
1840/// (15.4 [class.dtor]) from the context where the aggregate initialization
1841/// occurs.
1842static bool checkDestructorReference(QualType ElementType, SourceLocation Loc,
1843 Sema &SemaRef) {
1844 auto *CXXRD = ElementType->getAsCXXRecordDecl();
1845 if (!CXXRD)
1846 return false;
1847
1848 CXXDestructorDecl *Destructor = SemaRef.LookupDestructor(CXXRD);
1849 SemaRef.CheckDestructorAccess(Loc, Destructor,
1850 SemaRef.PDiag(diag::err_access_dtor_temp)
1851 << ElementType);
1852 SemaRef.MarkFunctionReferenced(Loc, Destructor);
1853 return SemaRef.DiagnoseUseOfDecl(Destructor, Loc);
1854}
1855
1856void InitListChecker::CheckArrayType(const InitializedEntity &Entity,
1857 InitListExpr *IList, QualType &DeclType,
1858 llvm::APSInt elementIndex,
1859 bool SubobjectIsDesignatorContext,
1860 unsigned &Index,
1861 InitListExpr *StructuredList,
1862 unsigned &StructuredIndex) {
1863 const ArrayType *arrayType = SemaRef.Context.getAsArrayType(DeclType);
1864
1865 if (!VerifyOnly) {
1866 if (checkDestructorReference(arrayType->getElementType(),
1867 IList->getEndLoc(), SemaRef)) {
1868 hadError = true;
1869 return;
1870 }
1871 }
1872
1873 // Check for the special-case of initializing an array with a string.
1874 if (Index < IList->getNumInits()) {
1875 if (IsStringInit(IList->getInit(Index), arrayType, SemaRef.Context) ==
1876 SIF_None) {
1877 // We place the string literal directly into the resulting
1878 // initializer list. This is the only place where the structure
1879 // of the structured initializer list doesn't match exactly,
1880 // because doing so would involve allocating one character
1881 // constant for each string.
1882 // FIXME: Should we do these checks in verify-only mode too?
1883 if (!VerifyOnly)
1884 CheckStringInit(IList->getInit(Index), DeclType, arrayType, SemaRef);
1885 if (StructuredList) {
1886 UpdateStructuredListElement(StructuredList, StructuredIndex,
1887 IList->getInit(Index));
1888 StructuredList->resizeInits(SemaRef.Context, StructuredIndex);
1889 }
1890 ++Index;
1891 return;
1892 }
1893 }
1894 if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(arrayType)) {
1895 // Check for VLAs; in standard C it would be possible to check this
1896 // earlier, but I don't know where clang accepts VLAs (gcc accepts
1897 // them in all sorts of strange places).
1898 if (!VerifyOnly)
1899 SemaRef.Diag(VAT->getSizeExpr()->getBeginLoc(),
1900 diag::err_variable_object_no_init)
1901 << VAT->getSizeExpr()->getSourceRange();
1902 hadError = true;
1903 ++Index;
1904 ++StructuredIndex;
1905 return;
1906 }
1907
1908 // We might know the maximum number of elements in advance.
1909 llvm::APSInt maxElements(elementIndex.getBitWidth(),
1910 elementIndex.isUnsigned());
1911 bool maxElementsKnown = false;
1912 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(arrayType)) {
1913 maxElements = CAT->getSize();
1914 elementIndex = elementIndex.extOrTrunc(maxElements.getBitWidth());
1915 elementIndex.setIsUnsigned(maxElements.isUnsigned());
1916 maxElementsKnown = true;
1917 }
1918
1919 QualType elementType = arrayType->getElementType();
1920 while (Index < IList->getNumInits()) {
1921 Expr *Init = IList->getInit(Index);
1922 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
1923 // If we're not the subobject that matches up with the '{' for
1924 // the designator, we shouldn't be handling the
1925 // designator. Return immediately.
1926 if (!SubobjectIsDesignatorContext)
1927 return;
1928
1929 // Handle this designated initializer. elementIndex will be
1930 // updated to be the next array element we'll initialize.
1931 if (CheckDesignatedInitializer(Entity, IList, DIE, 0,
1932 DeclType, nullptr, &elementIndex, Index,
1933 StructuredList, StructuredIndex, true,
1934 false)) {
1935 hadError = true;
1936 continue;
1937 }
1938
1939 if (elementIndex.getBitWidth() > maxElements.getBitWidth())
1940 maxElements = maxElements.extend(elementIndex.getBitWidth());
1941 else if (elementIndex.getBitWidth() < maxElements.getBitWidth())
1942 elementIndex = elementIndex.extend(maxElements.getBitWidth());
1943 elementIndex.setIsUnsigned(maxElements.isUnsigned());
1944
1945 // If the array is of incomplete type, keep track of the number of
1946 // elements in the initializer.
1947 if (!maxElementsKnown && elementIndex > maxElements)
1948 maxElements = elementIndex;
1949
1950 continue;
1951 }
1952
1953 // If we know the maximum number of elements, and we've already
1954 // hit it, stop consuming elements in the initializer list.
1955 if (maxElementsKnown && elementIndex == maxElements)
1956 break;
1957
1958 InitializedEntity ElementEntity =
1959 InitializedEntity::InitializeElement(SemaRef.Context, StructuredIndex,
1960 Entity);
1961 // Check this element.
1962 CheckSubElementType(ElementEntity, IList, elementType, Index,
1963 StructuredList, StructuredIndex);
1964 ++elementIndex;
1965
1966 // If the array is of incomplete type, keep track of the number of
1967 // elements in the initializer.
1968 if (!maxElementsKnown && elementIndex > maxElements)
1969 maxElements = elementIndex;
1970 }
1971 if (!hadError && DeclType->isIncompleteArrayType() && !VerifyOnly) {
1972 // If this is an incomplete array type, the actual type needs to
1973 // be calculated here.
1974 llvm::APSInt Zero(maxElements.getBitWidth(), maxElements.isUnsigned());
1975 if (maxElements == Zero && !Entity.isVariableLengthArrayNew()) {
1976 // Sizing an array implicitly to zero is not allowed by ISO C,
1977 // but is supported by GNU.
1978 SemaRef.Diag(IList->getBeginLoc(), diag::ext_typecheck_zero_array_size);
1979 }
1980
1981 DeclType = SemaRef.Context.getConstantArrayType(
1982 elementType, maxElements, nullptr, ArrayType::Normal, 0);
1983 }
1984 if (!hadError) {
1985 // If there are any members of the array that get value-initialized, check
1986 // that is possible. That happens if we know the bound and don't have
1987 // enough elements, or if we're performing an array new with an unknown
1988 // bound.
1989 if ((maxElementsKnown && elementIndex < maxElements) ||
1990 Entity.isVariableLengthArrayNew())
1991 CheckEmptyInitializable(
1992 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity),
1993 IList->getEndLoc());
1994 }
1995}
1996
1997bool InitListChecker::CheckFlexibleArrayInit(const InitializedEntity &Entity,
1998 Expr *InitExpr,
1999 FieldDecl *Field,
2000 bool TopLevelObject) {
2001 // Handle GNU flexible array initializers.
2002 unsigned FlexArrayDiag;
2003 if (isa<InitListExpr>(InitExpr) &&
2004 cast<InitListExpr>(InitExpr)->getNumInits() == 0) {
2005 // Empty flexible array init always allowed as an extension
2006 FlexArrayDiag = diag::ext_flexible_array_init;
2007 } else if (SemaRef.getLangOpts().CPlusPlus) {
2008 // Disallow flexible array init in C++; it is not required for gcc
2009 // compatibility, and it needs work to IRGen correctly in general.
2010 FlexArrayDiag = diag::err_flexible_array_init;
2011 } else if (!TopLevelObject) {
2012 // Disallow flexible array init on non-top-level object
2013 FlexArrayDiag = diag::err_flexible_array_init;
2014 } else if (Entity.getKind() != InitializedEntity::EK_Variable) {
2015 // Disallow flexible array init on anything which is not a variable.
2016 FlexArrayDiag = diag::err_flexible_array_init;
2017 } else if (cast<VarDecl>(Entity.getDecl())->hasLocalStorage()) {
2018 // Disallow flexible array init on local variables.
2019 FlexArrayDiag = diag::err_flexible_array_init;
2020 } else {
2021 // Allow other cases.
2022 FlexArrayDiag = diag::ext_flexible_array_init;
2023 }
2024
2025 if (!VerifyOnly) {
2026 SemaRef.Diag(InitExpr->getBeginLoc(), FlexArrayDiag)
2027 << InitExpr->getBeginLoc();
2028 SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
2029 << Field;
2030 }
2031
2032 return FlexArrayDiag != diag::ext_flexible_array_init;
2033}
2034
2035void InitListChecker::CheckStructUnionTypes(
2036 const InitializedEntity &Entity, InitListExpr *IList, QualType DeclType,
2037 CXXRecordDecl::base_class_range Bases, RecordDecl::field_iterator Field,
2038 bool SubobjectIsDesignatorContext, unsigned &Index,
2039 InitListExpr *StructuredList, unsigned &StructuredIndex,
2040 bool TopLevelObject) {
2041 RecordDecl *structDecl = DeclType->castAs<RecordType>()->getDecl();
2042
2043 // If the record is invalid, some of it's members are invalid. To avoid
2044 // confusion, we forgo checking the intializer for the entire record.
2045 if (structDecl->isInvalidDecl()) {
2046 // Assume it was supposed to consume a single initializer.
2047 ++Index;
2048 hadError = true;
2049 return;
2050 }
2051
2052 if (DeclType->isUnionType() && IList->getNumInits() == 0) {
2053 RecordDecl *RD = DeclType->castAs<RecordType>()->getDecl();
2054
2055 if (!VerifyOnly)
2056 for (FieldDecl *FD : RD->fields()) {
2057 QualType ET = SemaRef.Context.getBaseElementType(FD->getType());
2058 if (checkDestructorReference(ET, IList->getEndLoc(), SemaRef)) {
2059 hadError = true;
2060 return;
2061 }
2062 }
2063
2064 // If there's a default initializer, use it.
2065 if (isa<CXXRecordDecl>(RD) &&
2066 cast<CXXRecordDecl>(RD)->hasInClassInitializer()) {
2067 if (!StructuredList)
2068 return;
2069 for (RecordDecl::field_iterator FieldEnd = RD->field_end();
2070 Field != FieldEnd; ++Field) {
2071 if (Field->hasInClassInitializer()) {
2072 StructuredList->setInitializedFieldInUnion(*Field);
2073 // FIXME: Actually build a CXXDefaultInitExpr?
2074 return;
2075 }
2076 }
2077 }
2078
2079 // Value-initialize the first member of the union that isn't an unnamed
2080 // bitfield.
2081 for (RecordDecl::field_iterator FieldEnd = RD->field_end();
2082 Field != FieldEnd; ++Field) {
2083 if (!Field->isUnnamedBitfield()) {
2084 CheckEmptyInitializable(
2085 InitializedEntity::InitializeMember(*Field, &Entity),
2086 IList->getEndLoc());
2087 if (StructuredList)
2088 StructuredList->setInitializedFieldInUnion(*Field);
2089 break;
2090 }
2091 }
2092 return;
2093 }
2094
2095 bool InitializedSomething = false;
2096
2097 // If we have any base classes, they are initialized prior to the fields.
2098 for (auto &Base : Bases) {
2099 Expr *Init = Index < IList->getNumInits() ? IList->getInit(Index) : nullptr;
2100
2101 // Designated inits always initialize fields, so if we see one, all
2102 // remaining base classes have no explicit initializer.
2103 if (Init && isa<DesignatedInitExpr>(Init))
2104 Init = nullptr;
2105
2106 SourceLocation InitLoc = Init ? Init->getBeginLoc() : IList->getEndLoc();
2107 InitializedEntity BaseEntity = InitializedEntity::InitializeBase(
2108 SemaRef.Context, &Base, false, &Entity);
2109 if (Init) {
2110 CheckSubElementType(BaseEntity, IList, Base.getType(), Index,
2111 StructuredList, StructuredIndex);
2112 InitializedSomething = true;
2113 } else {
2114 CheckEmptyInitializable(BaseEntity, InitLoc);
2115 }
2116
2117 if (!VerifyOnly)
2118 if (checkDestructorReference(Base.getType(), InitLoc, SemaRef)) {
2119 hadError = true;
2120 return;
2121 }
2122 }
2123
2124 // If structDecl is a forward declaration, this loop won't do
2125 // anything except look at designated initializers; That's okay,
2126 // because an error should get printed out elsewhere. It might be
2127 // worthwhile to skip over the rest of the initializer, though.
2128 RecordDecl *RD = DeclType->castAs<RecordType>()->getDecl();
2129 RecordDecl::field_iterator FieldEnd = RD->field_end();
2130 bool CheckForMissingFields =
2131 !IList->isIdiomaticZeroInitializer(SemaRef.getLangOpts());
2132 bool HasDesignatedInit = false;
2133
2134 while (Index < IList->getNumInits()) {
2135 Expr *Init = IList->getInit(Index);
2136 SourceLocation InitLoc = Init->getBeginLoc();
2137
2138 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
2139 // If we're not the subobject that matches up with the '{' for
2140 // the designator, we shouldn't be handling the
2141 // designator. Return immediately.
2142 if (!SubobjectIsDesignatorContext)
2143 return;
2144
2145 HasDesignatedInit = true;
2146
2147 // Handle this designated initializer. Field will be updated to
2148 // the next field that we'll be initializing.
2149 if (CheckDesignatedInitializer(Entity, IList, DIE, 0,
2150 DeclType, &Field, nullptr, Index,
2151 StructuredList, StructuredIndex,
2152 true, TopLevelObject))
2153 hadError = true;
2154 else if (!VerifyOnly) {
2155 // Find the field named by the designated initializer.
2156 RecordDecl::field_iterator F = RD->field_begin();
2157 while (std::next(F) != Field)
2158 ++F;
2159 QualType ET = SemaRef.Context.getBaseElementType(F->getType());
2160 if (checkDestructorReference(ET, InitLoc, SemaRef)) {
2161 hadError = true;
2162 return;
2163 }
2164 }
2165
2166 InitializedSomething = true;
2167
2168 // Disable check for missing fields when designators are used.
2169 // This matches gcc behaviour.
2170 CheckForMissingFields = false;
2171 continue;
2172 }
2173
2174 if (Field == FieldEnd) {
2175 // We've run out of fields. We're done.
2176 break;
2177 }
2178
2179 // We've already initialized a member of a union. We're done.
2180 if (InitializedSomething && DeclType->isUnionType())
2181 break;
2182
2183 // If we've hit the flexible array member at the end, we're done.
2184 if (Field->getType()->isIncompleteArrayType())
2185 break;
2186
2187 if (Field->isUnnamedBitfield()) {
2188 // Don't initialize unnamed bitfields, e.g. "int : 20;"
2189 ++Field;
2190 continue;
2191 }
2192
2193 // Make sure we can use this declaration.
2194 bool InvalidUse;
2195 if (VerifyOnly)
2196 InvalidUse = !SemaRef.CanUseDecl(*Field, TreatUnavailableAsInvalid);
2197 else
2198 InvalidUse = SemaRef.DiagnoseUseOfDecl(
2199 *Field, IList->getInit(Index)->getBeginLoc());
2200 if (InvalidUse) {
2201 ++Index;
2202 ++Field;
2203 hadError = true;
2204 continue;
2205 }
2206
2207 if (!VerifyOnly) {
2208 QualType ET = SemaRef.Context.getBaseElementType(Field->getType());
2209 if (checkDestructorReference(ET, InitLoc, SemaRef)) {
2210 hadError = true;
2211 return;
2212 }
2213 }
2214
2215 InitializedEntity MemberEntity =
2216 InitializedEntity::InitializeMember(*Field, &Entity);
2217 CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
2218 StructuredList, StructuredIndex);
2219 InitializedSomething = true;
2220
2221 if (DeclType->isUnionType() && StructuredList) {
2222 // Initialize the first field within the union.
2223 StructuredList->setInitializedFieldInUnion(*Field);
2224 }
2225
2226 ++Field;
2227 }
2228
2229 // Emit warnings for missing struct field initializers.
2230 if (!VerifyOnly && InitializedSomething && CheckForMissingFields &&
2231 Field != FieldEnd && !Field->getType()->isIncompleteArrayType() &&
2232 !DeclType->isUnionType()) {
2233 // It is possible we have one or more unnamed bitfields remaining.
2234 // Find first (if any) named field and emit warning.
2235 for (RecordDecl::field_iterator it = Field, end = RD->field_end();
2236 it != end; ++it) {
2237 if (!it->isUnnamedBitfield() && !it->hasInClassInitializer()) {
2238 SemaRef.Diag(IList->getSourceRange().getEnd(),
2239 diag::warn_missing_field_initializers) << *it;
2240 break;
2241 }
2242 }
2243 }
2244
2245 // Check that any remaining fields can be value-initialized if we're not
2246 // building a structured list. (If we are, we'll check this later.)
2247 if (!StructuredList && Field != FieldEnd && !DeclType->isUnionType() &&
2248 !Field->getType()->isIncompleteArrayType()) {
2249 for (; Field != FieldEnd && !hadError; ++Field) {
2250 if (!Field->isUnnamedBitfield() && !Field->hasInClassInitializer())
2251 CheckEmptyInitializable(
2252 InitializedEntity::InitializeMember(*Field, &Entity),
2253 IList->getEndLoc());
2254 }
2255 }
2256
2257 // Check that the types of the remaining fields have accessible destructors.
2258 if (!VerifyOnly) {
2259 // If the initializer expression has a designated initializer, check the
2260 // elements for which a designated initializer is not provided too.
2261 RecordDecl::field_iterator I = HasDesignatedInit ? RD->field_begin()
2262 : Field;
2263 for (RecordDecl::field_iterator E = RD->field_end(); I != E; ++I) {
2264 QualType ET = SemaRef.Context.getBaseElementType(I->getType());
2265 if (checkDestructorReference(ET, IList->getEndLoc(), SemaRef)) {
2266 hadError = true;
2267 return;
2268 }
2269 }
2270 }
2271
2272 if (Field == FieldEnd || !Field->getType()->isIncompleteArrayType() ||
2273 Index >= IList->getNumInits())
2274 return;
2275
2276 if (CheckFlexibleArrayInit(Entity, IList->getInit(Index), *Field,
2277 TopLevelObject)) {
2278 hadError = true;
2279 ++Index;
2280 return;
2281 }
2282
2283 InitializedEntity MemberEntity =
2284 InitializedEntity::InitializeMember(*Field, &Entity);
2285
2286 if (isa<InitListExpr>(IList->getInit(Index)))
2287 CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
2288 StructuredList, StructuredIndex);
2289 else
2290 CheckImplicitInitList(MemberEntity, IList, Field->getType(), Index,
2291 StructuredList, StructuredIndex);
2292}
2293
2294/// Expand a field designator that refers to a member of an
2295/// anonymous struct or union into a series of field designators that
2296/// refers to the field within the appropriate subobject.
2297///
2298static void ExpandAnonymousFieldDesignator(Sema &SemaRef,
2299 DesignatedInitExpr *DIE,
2300 unsigned DesigIdx,
2301 IndirectFieldDecl *IndirectField) {
2302 typedef DesignatedInitExpr::Designator Designator;
2303
2304 // Build the replacement designators.
2305 SmallVector<Designator, 4> Replacements;
2306 for (IndirectFieldDecl::chain_iterator PI = IndirectField->chain_begin(),
2307 PE = IndirectField->chain_end(); PI != PE; ++PI) {
2308 if (PI + 1 == PE)
2309 Replacements.push_back(Designator((IdentifierInfo *)nullptr,
2310 DIE->getDesignator(DesigIdx)->getDotLoc(),
2311 DIE->getDesignator(DesigIdx)->getFieldLoc()));
2312 else
2313 Replacements.push_back(Designator((IdentifierInfo *)nullptr,
2314 SourceLocation(), SourceLocation()));
2315 assert(isa<FieldDecl>(*PI))((void)0);
2316 Replacements.back().setField(cast<FieldDecl>(*PI));
2317 }
2318
2319 // Expand the current designator into the set of replacement
2320 // designators, so we have a full subobject path down to where the
2321 // member of the anonymous struct/union is actually stored.
2322 DIE->ExpandDesignator(SemaRef.Context, DesigIdx, &Replacements[0],
2323 &Replacements[0] + Replacements.size());
2324}
2325
2326static DesignatedInitExpr *CloneDesignatedInitExpr(Sema &SemaRef,
2327 DesignatedInitExpr *DIE) {
2328 unsigned NumIndexExprs = DIE->getNumSubExprs() - 1;
2329 SmallVector<Expr*, 4> IndexExprs(NumIndexExprs);
2330 for (unsigned I = 0; I < NumIndexExprs; ++I)
2331 IndexExprs[I] = DIE->getSubExpr(I + 1);
2332 return DesignatedInitExpr::Create(SemaRef.Context, DIE->designators(),
2333 IndexExprs,
2334 DIE->getEqualOrColonLoc(),
2335 DIE->usesGNUSyntax(), DIE->getInit());
2336}
2337
2338namespace {
2339
2340// Callback to only accept typo corrections that are for field members of
2341// the given struct or union.
2342class FieldInitializerValidatorCCC final : public CorrectionCandidateCallback {
2343 public:
2344 explicit FieldInitializerValidatorCCC(RecordDecl *RD)
2345 : Record(RD) {}
2346
2347 bool ValidateCandidate(const TypoCorrection &candidate) override {
2348 FieldDecl *FD = candidate.getCorrectionDeclAs<FieldDecl>();
2349 return FD && FD->getDeclContext()->getRedeclContext()->Equals(Record);
2350 }
2351
2352 std::unique_ptr<CorrectionCandidateCallback> clone() override {
2353 return std::make_unique<FieldInitializerValidatorCCC>(*this);
2354 }
2355
2356 private:
2357 RecordDecl *Record;
2358};
2359
2360} // end anonymous namespace
2361
2362/// Check the well-formedness of a C99 designated initializer.
2363///
2364/// Determines whether the designated initializer @p DIE, which
2365/// resides at the given @p Index within the initializer list @p
2366/// IList, is well-formed for a current object of type @p DeclType
2367/// (C99 6.7.8). The actual subobject that this designator refers to
2368/// within the current subobject is returned in either
2369/// @p NextField or @p NextElementIndex (whichever is appropriate).
2370///
2371/// @param IList The initializer list in which this designated
2372/// initializer occurs.
2373///
2374/// @param DIE The designated initializer expression.
2375///
2376/// @param DesigIdx The index of the current designator.
2377///
2378/// @param CurrentObjectType The type of the "current object" (C99 6.7.8p17),
2379/// into which the designation in @p DIE should refer.
2380///
2381/// @param NextField If non-NULL and the first designator in @p DIE is
2382/// a field, this will be set to the field declaration corresponding
2383/// to the field named by the designator. On input, this is expected to be
2384/// the next field that would be initialized in the absence of designation,
2385/// if the complete object being initialized is a struct.
2386///
2387/// @param NextElementIndex If non-NULL and the first designator in @p
2388/// DIE is an array designator or GNU array-range designator, this
2389/// will be set to the last index initialized by this designator.
2390///
2391/// @param Index Index into @p IList where the designated initializer
2392/// @p DIE occurs.
2393///
2394/// @param StructuredList The initializer list expression that
2395/// describes all of the subobject initializers in the order they'll
2396/// actually be initialized.
2397///
2398/// @returns true if there was an error, false otherwise.
2399bool
2400InitListChecker::CheckDesignatedInitializer(const InitializedEntity &Entity,
2401 InitListExpr *IList,
2402 DesignatedInitExpr *DIE,
2403 unsigned DesigIdx,
2404 QualType &CurrentObjectType,
2405 RecordDecl::field_iterator *NextField,
2406 llvm::APSInt *NextElementIndex,
2407 unsigned &Index,
2408 InitListExpr *StructuredList,
2409 unsigned &StructuredIndex,
2410 bool FinishSubobjectInit,
2411 bool TopLevelObject) {
2412 if (DesigIdx == DIE->size()) {
2413 // C++20 designated initialization can result in direct-list-initialization
2414 // of the designated subobject. This is the only way that we can end up
2415 // performing direct initialization as part of aggregate initialization, so
2416 // it needs special handling.
2417 if (DIE->isDirectInit()) {
2418 Expr *Init = DIE->getInit();
2419 assert(isa<InitListExpr>(Init) &&((void)0)
2420 "designator result in direct non-list initialization?")((void)0);
2421 InitializationKind Kind = InitializationKind::CreateDirectList(
2422 DIE->getBeginLoc(), Init->getBeginLoc(), Init->getEndLoc());
2423 InitializationSequence Seq(SemaRef, Entity, Kind, Init,
2424 /*TopLevelOfInitList*/ true);
2425 if (StructuredList) {
2426 ExprResult Result = VerifyOnly
2427 ? getDummyInit()
2428 : Seq.Perform(SemaRef, Entity, Kind, Init);
2429 UpdateStructuredListElement(StructuredList, StructuredIndex,
2430 Result.get());
2431 }
2432 ++Index;
2433 return !Seq;
2434 }
2435
2436 // Check the actual initialization for the designated object type.
2437 bool prevHadError = hadError;
2438
2439 // Temporarily remove the designator expression from the
2440 // initializer list that the child calls see, so that we don't try
2441 // to re-process the designator.
2442 unsigned OldIndex = Index;
2443 IList->setInit(OldIndex, DIE->getInit());
2444
2445 CheckSubElementType(Entity, IList, CurrentObjectType, Index, StructuredList,
2446 StructuredIndex, /*DirectlyDesignated=*/true);
2447
2448 // Restore the designated initializer expression in the syntactic
2449 // form of the initializer list.
2450 if (IList->getInit(OldIndex) != DIE->getInit())
2451 DIE->setInit(IList->getInit(OldIndex));
2452 IList->setInit(OldIndex, DIE);
2453
2454 return hadError && !prevHadError;
2455 }
2456
2457 DesignatedInitExpr::Designator *D = DIE->getDesignator(DesigIdx);
2458 bool IsFirstDesignator = (DesigIdx == 0);
2459 if (IsFirstDesignator ? FullyStructuredList : StructuredList) {
2460 // Determine the structural initializer list that corresponds to the
2461 // current subobject.
2462 if (IsFirstDesignator)
2463 StructuredList = FullyStructuredList;
2464 else {
2465 Expr *ExistingInit = StructuredIndex < StructuredList->getNumInits() ?
2466 StructuredList->getInit(StructuredIndex) : nullptr;
2467 if (!ExistingInit && StructuredList->hasArrayFiller())
2468 ExistingInit = StructuredList->getArrayFiller();
2469
2470 if (!ExistingInit)
2471 StructuredList = getStructuredSubobjectInit(
2472 IList, Index, CurrentObjectType, StructuredList, StructuredIndex,
2473 SourceRange(D->getBeginLoc(), DIE->getEndLoc()));
2474 else if (InitListExpr *Result = dyn_cast<InitListExpr>(ExistingInit))
2475 StructuredList = Result;
2476 else {
2477 // We are creating an initializer list that initializes the
2478 // subobjects of the current object, but there was already an
2479 // initialization that completely initialized the current
2480 // subobject, e.g., by a compound literal:
2481 //
2482 // struct X { int a, b; };
2483 // struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 };
2484 //
2485 // Here, xs[0].a == 1 and xs[0].b == 3, since the second,
2486 // designated initializer re-initializes only its current object
2487 // subobject [0].b.
2488 diagnoseInitOverride(ExistingInit,
2489 SourceRange(D->getBeginLoc(), DIE->getEndLoc()),
2490 /*FullyOverwritten=*/false);
2491
2492 if (!VerifyOnly) {
2493 if (DesignatedInitUpdateExpr *E =
2494 dyn_cast<DesignatedInitUpdateExpr>(ExistingInit))
2495 StructuredList = E->getUpdater();
2496 else {
2497 DesignatedInitUpdateExpr *DIUE = new (SemaRef.Context)
2498 DesignatedInitUpdateExpr(SemaRef.Context, D->getBeginLoc(),
2499 ExistingInit, DIE->getEndLoc());
2500 StructuredList->updateInit(SemaRef.Context, StructuredIndex, DIUE);
2501 StructuredList = DIUE->getUpdater();
2502 }
2503 } else {
2504 // We don't need to track the structured representation of a
2505 // designated init update of an already-fully-initialized object in
2506 // verify-only mode. The only reason we would need the structure is
2507 // to determine where the uninitialized "holes" are, and in this
2508 // case, we know there aren't any and we can't introduce any.
2509 StructuredList = nullptr;
2510 }
2511 }
2512 }
2513 }
2514
2515 if (D->isFieldDesignator()) {
2516 // C99 6.7.8p7:
2517 //
2518 // If a designator has the form
2519 //
2520 // . identifier
2521 //
2522 // then the current object (defined below) shall have
2523 // structure or union type and the identifier shall be the
2524 // name of a member of that type.
2525 const RecordType *RT = CurrentObjectType->getAs<RecordType>();
2526 if (!RT) {
2527 SourceLocation Loc = D->getDotLoc();
2528 if (Loc.isInvalid())
2529 Loc = D->getFieldLoc();
2530 if (!VerifyOnly)
2531 SemaRef.Diag(Loc, diag::err_field_designator_non_aggr)
2532 << SemaRef.getLangOpts().CPlusPlus << CurrentObjectType;
2533 ++Index;
2534 return true;
2535 }
2536
2537 FieldDecl *KnownField = D->getField();
2538 if (!KnownField) {
2539 IdentifierInfo *FieldName = D->getFieldName();
2540 DeclContext::lookup_result Lookup = RT->getDecl()->lookup(FieldName);
2541 for (NamedDecl *ND : Lookup) {
2542 if (auto *FD = dyn_cast<FieldDecl>(ND)) {
2543 KnownField = FD;
2544 break;
2545 }
2546 if (auto *IFD = dyn_cast<IndirectFieldDecl>(ND)) {
2547 // In verify mode, don't modify the original.
2548 if (VerifyOnly)
2549 DIE = CloneDesignatedInitExpr(SemaRef, DIE);
2550 ExpandAnonymousFieldDesignator(SemaRef, DIE, DesigIdx, IFD);
2551 D = DIE->getDesignator(DesigIdx);
2552 KnownField = cast<FieldDecl>(*IFD->chain_begin());
2553 break;
2554 }
2555 }
2556 if (!KnownField) {
2557 if (VerifyOnly) {
2558 ++Index;
2559 return true; // No typo correction when just trying this out.
2560 }
2561
2562 // Name lookup found something, but it wasn't a field.
2563 if (!Lookup.empty()) {
2564 SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_nonfield)
2565 << FieldName;
2566 SemaRef.Diag(Lookup.front()->getLocation(),
2567 diag::note_field_designator_found);
2568 ++Index;
2569 return true;
2570 }
2571
2572 // Name lookup didn't find anything.
2573 // Determine whether this was a typo for another field name.
2574 FieldInitializerValidatorCCC CCC(RT->getDecl());
2575 if (TypoCorrection Corrected = SemaRef.CorrectTypo(
2576 DeclarationNameInfo(FieldName, D->getFieldLoc()),
2577 Sema::LookupMemberName, /*Scope=*/nullptr, /*SS=*/nullptr, CCC,
2578 Sema::CTK_ErrorRecovery, RT->getDecl())) {
2579 SemaRef.diagnoseTypo(
2580 Corrected,
2581 SemaRef.PDiag(diag::err_field_designator_unknown_suggest)
2582 << FieldName << CurrentObjectType);
2583 KnownField = Corrected.getCorrectionDeclAs<FieldDecl>();
2584 hadError = true;
2585 } else {
2586 // Typo correction didn't find anything.
2587 SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_unknown)
2588 << FieldName << CurrentObjectType;
2589 ++Index;
2590 return true;
2591 }
2592 }
2593 }
2594
2595 unsigned NumBases = 0;
2596 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
2597 NumBases = CXXRD->getNumBases();
2598
2599 unsigned FieldIndex = NumBases;
2600
2601 for (auto *FI : RT->getDecl()->fields()) {
2602 if (FI->isUnnamedBitfield())
2603 continue;
2604 if (declaresSameEntity(KnownField, FI)) {
2605 KnownField = FI;
2606 break;
2607 }
2608 ++FieldIndex;
2609 }
2610
2611 RecordDecl::field_iterator Field =
2612 RecordDecl::field_iterator(DeclContext::decl_iterator(KnownField));
2613
2614 // All of the fields of a union are located at the same place in
2615 // the initializer list.
2616 if (RT->getDecl()->isUnion()) {
2617 FieldIndex = 0;
2618 if (StructuredList) {
2619 FieldDecl *CurrentField = StructuredList->getInitializedFieldInUnion();
2620 if (CurrentField && !declaresSameEntity(CurrentField, *Field)) {
2621 assert(StructuredList->getNumInits() == 1((void)0)
2622 && "A union should never have more than one initializer!")((void)0);
2623
2624 Expr *ExistingInit = StructuredList->getInit(0);
2625 if (ExistingInit) {
2626 // We're about to throw away an initializer, emit warning.
2627 diagnoseInitOverride(
2628 ExistingInit, SourceRange(D->getBeginLoc(), DIE->getEndLoc()));
2629 }
2630
2631 // remove existing initializer
2632 StructuredList->resizeInits(SemaRef.Context, 0);
2633 StructuredList->setInitializedFieldInUnion(nullptr);
2634 }
2635
2636 StructuredList->setInitializedFieldInUnion(*Field);
2637 }
2638 }
2639
2640 // Make sure we can use this declaration.
2641 bool InvalidUse;
2642 if (VerifyOnly)
2643 InvalidUse = !SemaRef.CanUseDecl(*Field, TreatUnavailableAsInvalid);
2644 else
2645 InvalidUse = SemaRef.DiagnoseUseOfDecl(*Field, D->getFieldLoc());
2646 if (InvalidUse) {
2647 ++Index;
2648 return true;
2649 }
2650
2651 // C++20 [dcl.init.list]p3:
2652 // The ordered identifiers in the designators of the designated-
2653 // initializer-list shall form a subsequence of the ordered identifiers
2654 // in the direct non-static data members of T.
2655 //
2656 // Note that this is not a condition on forming the aggregate
2657 // initialization, only on actually performing initialization,
2658 // so it is not checked in VerifyOnly mode.
2659 //
2660 // FIXME: This is the only reordering diagnostic we produce, and it only
2661 // catches cases where we have a top-level field designator that jumps
2662 // backwards. This is the only such case that is reachable in an
2663 // otherwise-valid C++20 program, so is the only case that's required for
2664 // conformance, but for consistency, we should diagnose all the other
2665 // cases where a designator takes us backwards too.
2666 if (IsFirstDesignator && !VerifyOnly && SemaRef.getLangOpts().CPlusPlus &&
2667 NextField &&
2668 (*NextField == RT->getDecl()->field_end() ||
2669 (*NextField)->getFieldIndex() > Field->getFieldIndex() + 1)) {
2670 // Find the field that we just initialized.
2671 FieldDecl *PrevField = nullptr;
2672 for (auto FI = RT->getDecl()->field_begin();
2673 FI != RT->getDecl()->field_end(); ++FI) {
2674 if (FI->isUnnamedBitfield())
2675 continue;
2676 if (*NextField != RT->getDecl()->field_end() &&
2677 declaresSameEntity(*FI, **NextField))
2678 break;
2679 PrevField = *FI;
2680 }
2681
2682 if (PrevField &&
2683 PrevField->getFieldIndex() > KnownField->getFieldIndex()) {
2684 SemaRef.Diag(DIE->getBeginLoc(), diag::ext_designated_init_reordered)
2685 << KnownField << PrevField << DIE->getSourceRange();
2686
2687 unsigned OldIndex = NumBases + PrevField->getFieldIndex();
2688 if (StructuredList && OldIndex <= StructuredList->getNumInits()) {
2689 if (Expr *PrevInit = StructuredList->getInit(OldIndex)) {
2690 SemaRef.Diag(PrevInit->getBeginLoc(),
2691 diag::note_previous_field_init)
2692 << PrevField << PrevInit->getSourceRange();
2693 }
2694 }
2695 }
2696 }
2697
2698
2699 // Update the designator with the field declaration.
2700 if (!VerifyOnly)
2701 D->setField(*Field);
2702
2703 // Make sure that our non-designated initializer list has space
2704 // for a subobject corresponding to this field.
2705 if (StructuredList && FieldIndex >= StructuredList->getNumInits())
2706 StructuredList->resizeInits(SemaRef.Context, FieldIndex + 1);
2707
2708 // This designator names a flexible array member.
2709 if (Field->getType()->isIncompleteArrayType()) {
2710 bool Invalid = false;
2711 if ((DesigIdx + 1) != DIE->size()) {
2712 // We can't designate an object within the flexible array
2713 // member (because GCC doesn't allow it).
2714 if (!VerifyOnly) {
2715 DesignatedInitExpr::Designator *NextD
2716 = DIE->getDesignator(DesigIdx + 1);
2717 SemaRef.Diag(NextD->getBeginLoc(),
2718 diag::err_designator_into_flexible_array_member)
2719 << SourceRange(NextD->getBeginLoc(), DIE->getEndLoc());
2720 SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
2721 << *Field;
2722 }
2723 Invalid = true;
2724 }
2725
2726 if (!hadError && !isa<InitListExpr>(DIE->getInit()) &&
2727 !isa<StringLiteral>(DIE->getInit())) {
2728 // The initializer is not an initializer list.
2729 if (!VerifyOnly) {
2730 SemaRef.Diag(DIE->getInit()->getBeginLoc(),
2731 diag::err_flexible_array_init_needs_braces)
2732 << DIE->getInit()->getSourceRange();
2733 SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
2734 << *Field;
2735 }
2736 Invalid = true;
2737 }
2738
2739 // Check GNU flexible array initializer.
2740 if (!Invalid && CheckFlexibleArrayInit(Entity, DIE->getInit(), *Field,
2741 TopLevelObject))
2742 Invalid = true;
2743
2744 if (Invalid) {
2745 ++Index;
2746 return true;
2747 }
2748
2749 // Initialize the array.
2750 bool prevHadError = hadError;
2751 unsigned newStructuredIndex = FieldIndex;
2752 unsigned OldIndex = Index;
2753 IList->setInit(Index, DIE->getInit());
2754
2755 InitializedEntity MemberEntity =
2756 InitializedEntity::InitializeMember(*Field, &Entity);
2757 CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
2758 StructuredList, newStructuredIndex);
2759
2760 IList->setInit(OldIndex, DIE);
2761 if (hadError && !prevHadError) {
2762 ++Field;
2763 ++FieldIndex;
2764 if (NextField)
2765 *NextField = Field;
2766 StructuredIndex = FieldIndex;
2767 return true;
2768 }
2769 } else {
2770 // Recurse to check later designated subobjects.
2771 QualType FieldType = Field->getType();
2772 unsigned newStructuredIndex = FieldIndex;
2773
2774 InitializedEntity MemberEntity =
2775 InitializedEntity::InitializeMember(*Field, &Entity);
2776 if (CheckDesignatedInitializer(MemberEntity, IList, DIE, DesigIdx + 1,
2777 FieldType, nullptr, nullptr, Index,
2778 StructuredList, newStructuredIndex,
2779 FinishSubobjectInit, false))
2780 return true;
2781 }
2782
2783 // Find the position of the next field to be initialized in this
2784 // subobject.
2785 ++Field;
2786 ++FieldIndex;
2787
2788 // If this the first designator, our caller will continue checking
2789 // the rest of this struct/class/union subobject.
2790 if (IsFirstDesignator) {
2791 if (NextField)
2792 *NextField = Field;
2793 StructuredIndex = FieldIndex;
2794 return false;
2795 }
2796
2797 if (!FinishSubobjectInit)
2798 return false;
2799
2800 // We've already initialized something in the union; we're done.
2801 if (RT->getDecl()->isUnion())
2802 return hadError;
2803
2804 // Check the remaining fields within this class/struct/union subobject.
2805 bool prevHadError = hadError;
2806
2807 auto NoBases =
2808 CXXRecordDecl::base_class_range(CXXRecordDecl::base_class_iterator(),
2809 CXXRecordDecl::base_class_iterator());
2810 CheckStructUnionTypes(Entity, IList, CurrentObjectType, NoBases, Field,
2811 false, Index, StructuredList, FieldIndex);
2812 return hadError && !prevHadError;
2813 }
2814
2815 // C99 6.7.8p6:
2816 //
2817 // If a designator has the form
2818 //
2819 // [ constant-expression ]
2820 //
2821 // then the current object (defined below) shall have array
2822 // type and the expression shall be an integer constant
2823 // expression. If the array is of unknown size, any
2824 // nonnegative value is valid.
2825 //
2826 // Additionally, cope with the GNU extension that permits
2827 // designators of the form
2828 //
2829 // [ constant-expression ... constant-expression ]
2830 const ArrayType *AT = SemaRef.Context.getAsArrayType(CurrentObjectType);
2831 if (!AT) {
2832 if (!VerifyOnly)
2833 SemaRef.Diag(D->getLBracketLoc(), diag::err_array_designator_non_array)
2834 << CurrentObjectType;
2835 ++Index;
2836 return true;
2837 }
2838
2839 Expr *IndexExpr = nullptr;
2840 llvm::APSInt DesignatedStartIndex, DesignatedEndIndex;
2841 if (D->isArrayDesignator()) {
2842 IndexExpr = DIE->getArrayIndex(*D);
2843 DesignatedStartIndex = IndexExpr->EvaluateKnownConstInt(SemaRef.Context);
2844 DesignatedEndIndex = DesignatedStartIndex;
2845 } else {
2846 assert(D->isArrayRangeDesignator() && "Need array-range designator")((void)0);
2847
2848 DesignatedStartIndex =
2849 DIE->getArrayRangeStart(*D)->EvaluateKnownConstInt(SemaRef.Context);
2850 DesignatedEndIndex =
2851 DIE->getArrayRangeEnd(*D)->EvaluateKnownConstInt(SemaRef.Context);
2852 IndexExpr = DIE->getArrayRangeEnd(*D);
2853
2854 // Codegen can't handle evaluating array range designators that have side
2855 // effects, because we replicate the AST value for each initialized element.
2856 // As such, set the sawArrayRangeDesignator() bit if we initialize multiple
2857 // elements with something that has a side effect, so codegen can emit an
2858 // "error unsupported" error instead of miscompiling the app.
2859 if (DesignatedStartIndex.getZExtValue()!=DesignatedEndIndex.getZExtValue()&&
2860 DIE->getInit()->HasSideEffects(SemaRef.Context) && !VerifyOnly)
2861 FullyStructuredList->sawArrayRangeDesignator();
2862 }
2863
2864 if (isa<ConstantArrayType>(AT)) {
2865 llvm::APSInt MaxElements(cast<ConstantArrayType>(AT)->getSize(), false);
2866 DesignatedStartIndex
2867 = DesignatedStartIndex.extOrTrunc(MaxElements.getBitWidth());
2868 DesignatedStartIndex.setIsUnsigned(MaxElements.isUnsigned());
2869 DesignatedEndIndex
2870 = DesignatedEndIndex.extOrTrunc(MaxElements.getBitWidth());
2871 DesignatedEndIndex.setIsUnsigned(MaxElements.isUnsigned());
2872 if (DesignatedEndIndex >= MaxElements) {
2873 if (!VerifyOnly)
2874 SemaRef.Diag(IndexExpr->getBeginLoc(),
2875 diag::err_array_designator_too_large)
2876 << toString(DesignatedEndIndex, 10) << toString(MaxElements, 10)
2877 << IndexExpr->getSourceRange();
2878 ++Index;
2879 return true;
2880 }
2881 } else {
2882 unsigned DesignatedIndexBitWidth =
2883 ConstantArrayType::getMaxSizeBits(SemaRef.Context);
2884 DesignatedStartIndex =
2885 DesignatedStartIndex.extOrTrunc(DesignatedIndexBitWidth);
2886 DesignatedEndIndex =
2887 DesignatedEndIndex.extOrTrunc(DesignatedIndexBitWidth);
2888 DesignatedStartIndex.setIsUnsigned(true);
2889 DesignatedEndIndex.setIsUnsigned(true);
2890 }
2891
2892 bool IsStringLiteralInitUpdate =
2893 StructuredList && StructuredList->isStringLiteralInit();
2894 if (IsStringLiteralInitUpdate && VerifyOnly) {
2895 // We're just verifying an update to a string literal init. We don't need
2896 // to split the string up into individual characters to do that.
2897 StructuredList = nullptr;
2898 } else if (IsStringLiteralInitUpdate) {
2899 // We're modifying a string literal init; we have to decompose the string
2900 // so we can modify the individual characters.
2901 ASTContext &Context = SemaRef.Context;
2902 Expr *SubExpr = StructuredList->getInit(0)->IgnoreParens();
2903
2904 // Compute the character type
2905 QualType CharTy = AT->getElementType();
2906
2907 // Compute the type of the integer literals.
2908 QualType PromotedCharTy = CharTy;
2909 if (CharTy->isPromotableIntegerType())
2910 PromotedCharTy = Context.getPromotedIntegerType(CharTy);
2911 unsigned PromotedCharTyWidth = Context.getTypeSize(PromotedCharTy);
2912
2913 if (StringLiteral *SL = dyn_cast<StringLiteral>(SubExpr)) {
2914 // Get the length of the string.
2915 uint64_t StrLen = SL->getLength();
2916 if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen))
2917 StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue();
2918 StructuredList->resizeInits(Context, StrLen);
2919
2920 // Build a literal for each character in the string, and put them into
2921 // the init list.
2922 for (unsigned i = 0, e = StrLen; i != e; ++i) {
2923 llvm::APInt CodeUnit(PromotedCharTyWidth, SL->getCodeUnit(i));
2924 Expr *Init = new (Context) IntegerLiteral(
2925 Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc());
2926 if (CharTy != PromotedCharTy)
2927 Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast,
2928 Init, nullptr, VK_PRValue,
2929 FPOptionsOverride());
2930 StructuredList->updateInit(Context, i, Init);
2931 }
2932 } else {
2933 ObjCEncodeExpr *E = cast<ObjCEncodeExpr>(SubExpr);
2934 std::string Str;
2935 Context.getObjCEncodingForType(E->getEncodedType(), Str);
2936
2937 // Get the length of the string.
2938 uint64_t StrLen = Str.size();
2939 if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen))
2940 StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue();
2941 StructuredList->resizeInits(Context, StrLen);
2942
2943 // Build a literal for each character in the string, and put them into
2944 // the init list.
2945 for (unsigned i = 0, e = StrLen; i != e; ++i) {
2946 llvm::APInt CodeUnit(PromotedCharTyWidth, Str[i]);
2947 Expr *Init = new (Context) IntegerLiteral(
2948 Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc());
2949 if (CharTy != PromotedCharTy)
2950 Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast,
2951 Init, nullptr, VK_PRValue,
2952 FPOptionsOverride());
2953 StructuredList->updateInit(Context, i, Init);
2954 }
2955 }
2956 }
2957
2958 // Make sure that our non-designated initializer list has space
2959 // for a subobject corresponding to this array element.
2960 if (StructuredList &&
2961 DesignatedEndIndex.getZExtValue() >= StructuredList->getNumInits())
2962 StructuredList->resizeInits(SemaRef.Context,
2963 DesignatedEndIndex.getZExtValue() + 1);
2964
2965 // Repeatedly perform subobject initializations in the range
2966 // [DesignatedStartIndex, DesignatedEndIndex].
2967
2968 // Move to the next designator
2969 unsigned ElementIndex = DesignatedStartIndex.getZExtValue();
2970 unsigned OldIndex = Index;
2971
2972 InitializedEntity ElementEntity =
2973 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
2974
2975 while (DesignatedStartIndex <= DesignatedEndIndex) {
2976 // Recurse to check later designated subobjects.
2977 QualType ElementType = AT->getElementType();
2978 Index = OldIndex;
2979
2980 ElementEntity.setElementIndex(ElementIndex);
2981 if (CheckDesignatedInitializer(
2982 ElementEntity, IList, DIE, DesigIdx + 1, ElementType, nullptr,
2983 nullptr, Index, StructuredList, ElementIndex,
2984 FinishSubobjectInit && (DesignatedStartIndex == DesignatedEndIndex),
2985 false))
2986 return true;
2987
2988 // Move to the next index in the array that we'll be initializing.
2989 ++DesignatedStartIndex;
2990 ElementIndex = DesignatedStartIndex.getZExtValue();
2991 }
2992
2993 // If this the first designator, our caller will continue checking
2994 // the rest of this array subobject.
2995 if (IsFirstDesignator) {
2996 if (NextElementIndex)
2997 *NextElementIndex = DesignatedStartIndex;
2998 StructuredIndex = ElementIndex;
2999 return false;
3000 }
3001
3002 if (!FinishSubobjectInit)
3003 return false;
3004
3005 // Check the remaining elements within this array subobject.
3006 bool prevHadError = hadError;
3007 CheckArrayType(Entity, IList, CurrentObjectType, DesignatedStartIndex,
3008 /*SubobjectIsDesignatorContext=*/false, Index,
3009 StructuredList, ElementIndex);
3010 return hadError && !prevHadError;
3011}
3012
3013// Get the structured initializer list for a subobject of type
3014// @p CurrentObjectType.
3015InitListExpr *
3016InitListChecker::getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
3017 QualType CurrentObjectType,
3018 InitListExpr *StructuredList,
3019 unsigned StructuredIndex,
3020 SourceRange InitRange,
3021 bool IsFullyOverwritten) {
3022 if (!StructuredList)
3023 return nullptr;
3024
3025 Expr *ExistingInit = nullptr;
3026 if (StructuredIndex < StructuredList->getNumInits())
3027 ExistingInit = StructuredList->getInit(StructuredIndex);
3028
3029 if (InitListExpr *Result = dyn_cast_or_null<InitListExpr>(ExistingInit))
3030 // There might have already been initializers for subobjects of the current
3031 // object, but a subsequent initializer list will overwrite the entirety
3032 // of the current object. (See DR 253 and C99 6.7.8p21). e.g.,
3033 //
3034 // struct P { char x[6]; };
3035 // struct P l = { .x[2] = 'x', .x = { [0] = 'f' } };
3036 //
3037 // The first designated initializer is ignored, and l.x is just "f".
3038 if (!IsFullyOverwritten)
3039 return Result;
3040
3041 if (ExistingInit) {
3042 // We are creating an initializer list that initializes the
3043 // subobjects of the current object, but there was already an
3044 // initialization that completely initialized the current
3045 // subobject:
3046 //
3047 // struct X { int a, b; };
3048 // struct X xs[] = { [0] = { 1, 2 }, [0].b = 3 };
3049 //
3050 // Here, xs[0].a == 1 and xs[0].b == 3, since the second,
3051 // designated initializer overwrites the [0].b initializer
3052 // from the prior initialization.
3053 //
3054 // When the existing initializer is an expression rather than an
3055 // initializer list, we cannot decompose and update it in this way.
3056 // For example:
3057 //
3058 // struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 };
3059 //
3060 // This case is handled by CheckDesignatedInitializer.
3061 diagnoseInitOverride(ExistingInit, InitRange);
3062 }
3063
3064 unsigned ExpectedNumInits = 0;
3065 if (Index < IList->getNumInits()) {
3066 if (auto *Init = dyn_cast_or_null<InitListExpr>(IList->getInit(Index)))
3067 ExpectedNumInits = Init->getNumInits();
3068 else
3069 ExpectedNumInits = IList->getNumInits() - Index;
3070 }
3071
3072 InitListExpr *Result =
3073 createInitListExpr(CurrentObjectType, InitRange, ExpectedNumInits);
3074
3075 // Link this new initializer list into the structured initializer
3076 // lists.
3077 StructuredList->updateInit(SemaRef.Context, StructuredIndex, Result);
3078 return Result;
3079}
3080
3081InitListExpr *
3082InitListChecker::createInitListExpr(QualType CurrentObjectType,
3083 SourceRange InitRange,
3084 unsigned ExpectedNumInits) {
3085 InitListExpr *Result
3086 = new (SemaRef.Context) InitListExpr(SemaRef.Context,
3087 InitRange.getBegin(), None,
3088 InitRange.getEnd());
3089
3090 QualType ResultType = CurrentObjectType;
3091 if (!ResultType->isArrayType())
3092 ResultType = ResultType.getNonLValueExprType(SemaRef.Context);
3093 Result->setType(ResultType);
3094
3095 // Pre-allocate storage for the structured initializer list.
3096 unsigned NumElements = 0;
3097
3098 if (const ArrayType *AType
3099 = SemaRef.Context.getAsArrayType(CurrentObjectType)) {
3100 if (const ConstantArrayType *CAType = dyn_cast<ConstantArrayType>(AType)) {
3101 NumElements = CAType->getSize().getZExtValue();
3102 // Simple heuristic so that we don't allocate a very large
3103 // initializer with many empty entries at the end.
3104 if (NumElements > ExpectedNumInits)
3105 NumElements = 0;
3106 }
3107 } else if (const VectorType *VType = CurrentObjectType->getAs<VectorType>()) {
3108 NumElements = VType->getNumElements();
3109 } else if (CurrentObjectType->isRecordType()) {
3110 NumElements = numStructUnionElements(CurrentObjectType);
3111 }
3112
3113 Result->reserveInits(SemaRef.Context, NumElements);
3114
3115 return Result;
3116}
3117
3118/// Update the initializer at index @p StructuredIndex within the
3119/// structured initializer list to the value @p expr.
3120void InitListChecker::UpdateStructuredListElement(InitListExpr *StructuredList,
3121 unsigned &StructuredIndex,
3122 Expr *expr) {
3123 // No structured initializer list to update
3124 if (!StructuredList)
3125 return;
3126
3127 if (Expr *PrevInit = StructuredList->updateInit(SemaRef.Context,
3128 StructuredIndex, expr)) {
3129 // This initializer overwrites a previous initializer.
3130 // No need to diagnose when `expr` is nullptr because a more relevant
3131 // diagnostic has already been issued and this diagnostic is potentially
3132 // noise.
3133 if (expr)
3134 diagnoseInitOverride(PrevInit, expr->getSourceRange());
3135 }
3136
3137 ++StructuredIndex;
3138}
3139
3140/// Determine whether we can perform aggregate initialization for the purposes
3141/// of overload resolution.
3142bool Sema::CanPerformAggregateInitializationForOverloadResolution(
3143 const InitializedEntity &Entity, InitListExpr *From) {
3144 QualType Type = Entity.getType();
3145 InitListChecker Check(*this, Entity, From, Type, /*VerifyOnly=*/true,
3146 /*TreatUnavailableAsInvalid=*/false,
3147 /*InOverloadResolution=*/true);
3148 return !Check.HadError();
3149}
3150
3151/// Check that the given Index expression is a valid array designator
3152/// value. This is essentially just a wrapper around
3153/// VerifyIntegerConstantExpression that also checks for negative values
3154/// and produces a reasonable diagnostic if there is a
3155/// failure. Returns the index expression, possibly with an implicit cast
3156/// added, on success. If everything went okay, Value will receive the
3157/// value of the constant expression.
3158static ExprResult
3159CheckArrayDesignatorExpr(Sema &S, Expr *Index, llvm::APSInt &Value) {
3160 SourceLocation Loc = Index->getBeginLoc();
3161
3162 // Make sure this is an integer constant expression.
3163 ExprResult Result =
3164 S.VerifyIntegerConstantExpression(Index, &Value, Sema::AllowFold);
3165 if (Result.isInvalid())
3166 return Result;
3167
3168 if (Value.isSigned() && Value.isNegative())
3169 return S.Diag(Loc, diag::err_array_designator_negative)
3170 << toString(Value, 10) << Index->getSourceRange();
3171
3172 Value.setIsUnsigned(true);
3173 return Result;
3174}
3175
3176ExprResult Sema::ActOnDesignatedInitializer(Designation &Desig,
3177 SourceLocation EqualOrColonLoc,
3178 bool GNUSyntax,
3179 ExprResult Init) {
3180 typedef DesignatedInitExpr::Designator ASTDesignator;
3181
3182 bool Invalid = false;
3183 SmallVector<ASTDesignator, 32> Designators;
3184 SmallVector<Expr *, 32> InitExpressions;
3185
3186 // Build designators and check array designator expressions.
3187 for (unsigned Idx = 0; Idx < Desig.getNumDesignators(); ++Idx) {
3188 const Designator &D = Desig.getDesignator(Idx);
3189 switch (D.getKind()) {
3190 case Designator::FieldDesignator:
3191 Designators.push_back(ASTDesignator(D.getField(), D.getDotLoc(),
3192 D.getFieldLoc()));
3193 break;
3194
3195 case Designator::ArrayDesignator: {
3196 Expr *Index = static_cast<Expr *>(D.getArrayIndex());
3197 llvm::APSInt IndexValue;
3198 if (!Index->isTypeDependent() && !Index->isValueDependent())
3199 Index = CheckArrayDesignatorExpr(*this, Index, IndexValue).get();
3200 if (!Index)
3201 Invalid = true;
3202 else {
3203 Designators.push_back(ASTDesignator(InitExpressions.size(),
3204 D.getLBracketLoc(),
3205 D.getRBracketLoc()));
3206 InitExpressions.push_back(Index);
3207 }
3208 break;
3209 }
3210
3211 case Designator::ArrayRangeDesignator: {
3212 Expr *StartIndex = static_cast<Expr *>(D.getArrayRangeStart());
3213 Expr *EndIndex = static_cast<Expr *>(D.getArrayRangeEnd());
3214 llvm::APSInt StartValue;
3215 llvm::APSInt EndValue;
3216 bool StartDependent = StartIndex->isTypeDependent() ||
3217 StartIndex->isValueDependent();
3218 bool EndDependent = EndIndex->isTypeDependent() ||
3219 EndIndex->isValueDependent();
3220 if (!StartDependent)
3221 StartIndex =
3222 CheckArrayDesignatorExpr(*this, StartIndex, StartValue).get();
3223 if (!EndDependent)
3224 EndIndex = CheckArrayDesignatorExpr(*this, EndIndex, EndValue).get();
3225
3226 if (!StartIndex || !EndIndex)
3227 Invalid = true;
3228 else {
3229 // Make sure we're comparing values with the same bit width.
3230 if (StartDependent || EndDependent) {
3231 // Nothing to compute.
3232 } else if (StartValue.getBitWidth() > EndValue.getBitWidth())
3233 EndValue = EndValue.extend(StartValue.getBitWidth());
3234 else if (StartValue.getBitWidth() < EndValue.getBitWidth())
3235 StartValue = StartValue.extend(EndValue.getBitWidth());
3236
3237 if (!StartDependent && !EndDependent && EndValue < StartValue) {
3238 Diag(D.getEllipsisLoc(), diag::err_array_designator_empty_range)
3239 << toString(StartValue, 10) << toString(EndValue, 10)
3240 << StartIndex->getSourceRange() << EndIndex->getSourceRange();
3241 Invalid = true;
3242 } else {
3243 Designators.push_back(ASTDesignator(InitExpressions.size(),
3244 D.getLBracketLoc(),
3245 D.getEllipsisLoc(),
3246 D.getRBracketLoc()));
3247 InitExpressions.push_back(StartIndex);
3248 InitExpressions.push_back(EndIndex);
3249 }
3250 }
3251 break;
3252 }
3253 }
3254 }
3255
3256 if (Invalid || Init.isInvalid())
3257 return ExprError();
3258
3259 // Clear out the expressions within the designation.
3260 Desig.ClearExprs(*this);
3261
3262 return DesignatedInitExpr::Create(Context, Designators, InitExpressions,
3263 EqualOrColonLoc, GNUSyntax,
3264 Init.getAs<Expr>());
3265}
3266
3267//===----------------------------------------------------------------------===//
3268// Initialization entity
3269//===----------------------------------------------------------------------===//
3270
3271InitializedEntity::InitializedEntity(ASTContext &Context, unsigned Index,
3272 const InitializedEntity &Parent)
3273 : Parent(&Parent), Index(Index)
3274{
3275 if (const ArrayType *AT = Context.getAsArrayType(Parent.getType())) {
3276 Kind = EK_ArrayElement;
3277 Type = AT->getElementType();
3278 } else if (const VectorType *VT = Parent.getType()->getAs<VectorType>()) {
3279 Kind = EK_VectorElement;
3280 Type = VT->getElementType();
3281 } else {
3282 const ComplexType *CT = Parent.getType()->getAs<ComplexType>();
3283 assert(CT && "Unexpected type")((void)0);
3284 Kind = EK_ComplexElement;
3285 Type = CT->getElementType();
3286 }
3287}
3288
3289InitializedEntity
3290InitializedEntity::InitializeBase(ASTContext &Context,
3291 const CXXBaseSpecifier *Base,
3292 bool IsInheritedVirtualBase,
3293 const InitializedEntity *Parent) {
3294 InitializedEntity Result;
3295 Result.Kind = EK_Base;
3296 Result.Parent = Parent;
3297 Result.Base = {Base, IsInheritedVirtualBase};
3298 Result.Type = Base->getType();
3299 return Result;
3300}
3301
3302DeclarationName InitializedEntity::getName() const {
3303 switch (getKind()) {
3304 case EK_Parameter:
3305 case EK_Parameter_CF_Audited: {
3306 ParmVarDecl *D = Parameter.getPointer();
3307 return (D ? D->getDeclName() : DeclarationName());
3308 }
3309
3310 case EK_Variable:
3311 case EK_Member:
3312 case EK_Binding:
3313 case EK_TemplateParameter:
3314 return Variable.VariableOrMember->getDeclName();
3315
3316 case EK_LambdaCapture:
3317 return DeclarationName(Capture.VarID);
3318
3319 case EK_Result:
3320 case EK_StmtExprResult:
3321 case EK_Exception:
3322 case EK_New:
3323 case EK_Temporary:
3324 case EK_Base:
3325 case EK_Delegating:
3326 case EK_ArrayElement:
3327 case EK_VectorElement:
3328 case EK_ComplexElement:
3329 case EK_BlockElement:
3330 case EK_LambdaToBlockConversionBlockElement:
3331 case EK_CompoundLiteralInit:
3332 case EK_RelatedResult:
3333 return DeclarationName();
3334 }
3335
3336 llvm_unreachable("Invalid EntityKind!")__builtin_unreachable();
3337}
3338
3339ValueDecl *InitializedEntity::getDecl() const {
3340 switch (getKind()) {
3341 case EK_Variable:
3342 case EK_Member:
3343 case EK_Binding:
3344 case EK_TemplateParameter:
3345 return Variable.VariableOrMember;
3346
3347 case EK_Parameter:
3348 case EK_Parameter_CF_Audited:
3349 return Parameter.getPointer();
3350
3351 case EK_Result:
3352 case EK_StmtExprResult:
3353 case EK_Exception:
3354 case EK_New:
3355 case EK_Temporary:
3356 case EK_Base:
3357 case EK_Delegating:
3358 case EK_ArrayElement:
3359 case EK_VectorElement:
3360 case EK_ComplexElement:
3361 case EK_BlockElement:
3362 case EK_LambdaToBlockConversionBlockElement:
3363 case EK_LambdaCapture:
3364 case EK_CompoundLiteralInit:
3365 case EK_RelatedResult:
3366 return nullptr;
3367 }
3368
3369 llvm_unreachable("Invalid EntityKind!")__builtin_unreachable();
3370}
3371
3372bool InitializedEntity::allowsNRVO() const {
3373 switch (getKind()) {
3374 case EK_Result:
3375 case EK_Exception:
3376 return LocAndNRVO.NRVO;
3377
3378 case EK_StmtExprResult:
3379 case EK_Variable:
3380 case EK_Parameter:
3381 case EK_Parameter_CF_Audited:
3382 case EK_TemplateParameter:
3383 case EK_Member:
3384 case EK_Binding:
3385 case EK_New:
3386 case EK_Temporary:
3387 case EK_CompoundLiteralInit:
3388 case EK_Base:
3389 case EK_Delegating:
3390 case EK_ArrayElement:
3391 case EK_VectorElement:
3392 case EK_ComplexElement:
3393 case EK_BlockElement:
3394 case EK_LambdaToBlockConversionBlockElement:
3395 case EK_LambdaCapture:
3396 case EK_RelatedResult:
3397 break;
3398 }
3399
3400 return false;
3401}
3402
3403unsigned InitializedEntity::dumpImpl(raw_ostream &OS) const {
3404 assert(getParent() != this)((void)0);
3405 unsigned Depth = getParent() ? getParent()->dumpImpl(OS) : 0;
3406 for (unsigned I = 0; I != Depth; ++I)
3407 OS << "`-";
3408
3409 switch (getKind()) {
3410 case EK_Variable: OS << "Variable"; break;
3411 case EK_Parameter: OS << "Parameter"; break;
3412 case EK_Parameter_CF_Audited: OS << "CF audited function Parameter";
3413 break;
3414 case EK_TemplateParameter: OS << "TemplateParameter"; break;
3415 case EK_Result: OS << "Result"; break;
3416 case EK_StmtExprResult: OS << "StmtExprResult"; break;
3417 case EK_Exception: OS << "Exception"; break;
3418 case EK_Member: OS << "Member"; break;
3419 case EK_Binding: OS << "Binding"; break;
3420 case EK_New: OS << "New"; break;
3421 case EK_Temporary: OS << "Temporary"; break;
3422 case EK_CompoundLiteralInit: OS << "CompoundLiteral";break;
3423 case EK_RelatedResult: OS << "RelatedResult"; break;
3424 case EK_Base: OS << "Base"; break;
3425 case EK_Delegating: OS << "Delegating"; break;
3426 case EK_ArrayElement: OS << "ArrayElement " << Index; break;
3427 case EK_VectorElement: OS << "VectorElement " << Index; break;
3428 case EK_ComplexElement: OS << "ComplexElement " << Index; break;
3429 case EK_BlockElement: OS << "Block"; break;
3430 case EK_LambdaToBlockConversionBlockElement:
3431 OS << "Block (lambda)";
3432 break;
3433 case EK_LambdaCapture:
3434 OS << "LambdaCapture ";
3435 OS << DeclarationName(Capture.VarID);
3436 break;
3437 }
3438
3439 if (auto *D = getDecl()) {
3440 OS << " ";
3441 D->printQualifiedName(OS);
3442 }
3443
3444 OS << " '" << getType().getAsString() << "'\n";
3445
3446 return Depth + 1;
3447}
3448
3449LLVM_DUMP_METHOD__attribute__((noinline)) void InitializedEntity::dump() const {
3450 dumpImpl(llvm::errs());
3451}
3452
3453//===----------------------------------------------------------------------===//
3454// Initialization sequence
3455//===----------------------------------------------------------------------===//
3456
3457void InitializationSequence::Step::Destroy() {
3458 switch (Kind) {
3459 case SK_ResolveAddressOfOverloadedFunction:
3460 case SK_CastDerivedToBasePRValue:
3461 case SK_CastDerivedToBaseXValue:
3462 case SK_CastDerivedToBaseLValue:
3463 case SK_BindReference:
3464 case SK_BindReferenceToTemporary:
3465 case SK_FinalCopy:
3466 case SK_ExtraneousCopyToTemporary:
3467 case SK_UserConversion:
3468 case SK_QualificationConversionPRValue:
3469 case SK_QualificationConversionXValue:
3470 case SK_QualificationConversionLValue:
3471 case SK_FunctionReferenceConversion:
3472 case SK_AtomicConversion:
3473 case SK_ListInitialization:
3474 case SK_UnwrapInitList:
3475 case SK_RewrapInitList:
3476 case SK_ConstructorInitialization:
3477 case SK_ConstructorInitializationFromList:
3478 case SK_ZeroInitialization:
3479 case SK_CAssignment:
3480 case SK_StringInit:
3481 case SK_ObjCObjectConversion:
3482 case SK_ArrayLoopIndex:
3483 case SK_ArrayLoopInit:
3484 case SK_ArrayInit:
3485 case SK_GNUArrayInit:
3486 case SK_ParenthesizedArrayInit:
3487 case SK_PassByIndirectCopyRestore:
3488 case SK_PassByIndirectRestore:
3489 case SK_ProduceObjCObject:
3490 case SK_StdInitializerList:
3491 case SK_StdInitializerListConstructorCall:
3492 case SK_OCLSamplerInit:
3493 case SK_OCLZeroOpaqueType:
3494 break;
3495
3496 case SK_ConversionSequence:
3497 case SK_ConversionSequenceNoNarrowing:
3498 delete ICS;
3499 }
3500}
3501
3502bool InitializationSequence::isDirectReferenceBinding() const {
3503 // There can be some lvalue adjustments after the SK_BindReference step.
3504 for (auto I = Steps.rbegin(); I != Steps.rend(); ++I) {
3505 if (I->Kind == SK_BindReference)
3506 return true;
3507 if (I->Kind == SK_BindReferenceToTemporary)
3508 return false;
3509 }
3510 return false;
3511}
3512
3513bool InitializationSequence::isAmbiguous() const {
3514 if (!Failed())
3515 return false;
3516
3517 switch (getFailureKind()) {
3518 case FK_TooManyInitsForReference:
3519 case FK_ParenthesizedListInitForReference:
3520 case FK_ArrayNeedsInitList:
3521 case FK_ArrayNeedsInitListOrStringLiteral:
3522 case FK_ArrayNeedsInitListOrWideStringLiteral:
3523 case FK_NarrowStringIntoWideCharArray:
3524 case FK_WideStringIntoCharArray:
3525 case FK_IncompatWideStringIntoWideChar:
3526 case FK_PlainStringIntoUTF8Char:
3527 case FK_UTF8StringIntoPlainChar:
3528 case FK_AddressOfOverloadFailed: // FIXME: Could do better
3529 case FK_NonConstLValueReferenceBindingToTemporary:
3530 case FK_NonConstLValueReferenceBindingToBitfield:
3531 case FK_NonConstLValueReferenceBindingToVectorElement:
3532 case FK_NonConstLValueReferenceBindingToMatrixElement:
3533 case FK_NonConstLValueReferenceBindingToUnrelated:
3534 case FK_RValueReferenceBindingToLValue:
3535 case FK_ReferenceAddrspaceMismatchTemporary:
3536 case FK_ReferenceInitDropsQualifiers:
3537 case FK_ReferenceInitFailed:
3538 case FK_ConversionFailed:
3539 case FK_ConversionFromPropertyFailed:
3540 case FK_TooManyInitsForScalar:
3541 case FK_ParenthesizedListInitForScalar:
3542 case FK_ReferenceBindingToInitList:
3543 case FK_InitListBadDestinationType:
3544 case FK_DefaultInitOfConst:
3545 case FK_Incomplete:
3546 case FK_ArrayTypeMismatch:
3547 case FK_NonConstantArrayInit:
3548 case FK_ListInitializationFailed:
3549 case FK_VariableLengthArrayHasInitializer:
3550 case FK_PlaceholderType:
3551 case FK_ExplicitConstructor:
3552 case FK_AddressOfUnaddressableFunction:
3553 return false;
3554
3555 case FK_ReferenceInitOverloadFailed:
3556 case FK_UserConversionOverloadFailed:
3557 case FK_ConstructorOverloadFailed:
3558 case FK_ListConstructorOverloadFailed:
3559 return FailedOverloadResult == OR_Ambiguous;
3560 }
3561
3562 llvm_unreachable("Invalid EntityKind!")__builtin_unreachable();
3563}
3564
3565bool InitializationSequence::isConstructorInitialization() const {
3566 return !Steps.empty() && Steps.back().Kind == SK_ConstructorInitialization;
3567}
3568
3569void
3570InitializationSequence
3571::AddAddressOverloadResolutionStep(FunctionDecl *Function,
3572 DeclAccessPair Found,
3573 bool HadMultipleCandidates) {
3574 Step S;
3575 S.Kind = SK_ResolveAddressOfOverloadedFunction;
3576 S.Type = Function->getType();
3577 S.Function.HadMultipleCandidates = HadMultipleCandidates;
3578 S.Function.Function = Function;
3579 S.Function.FoundDecl = Found;
3580 Steps.push_back(S);
3581}
3582
3583void InitializationSequence::AddDerivedToBaseCastStep(QualType BaseType,
3584 ExprValueKind VK) {
3585 Step S;
3586 switch (VK) {
3587 case VK_PRValue:
3588 S.Kind = SK_CastDerivedToBasePRValue;
3589 break;
3590 case VK_XValue: S.Kind = SK_CastDerivedToBaseXValue; break;
3591 case VK_LValue: S.Kind = SK_CastDerivedToBaseLValue; break;
3592 }
3593 S.Type = BaseType;
3594 Steps.push_back(S);
3595}
3596
3597void InitializationSequence::AddReferenceBindingStep(QualType T,
3598 bool BindingTemporary) {
3599 Step S;
3600 S.Kind = BindingTemporary? SK_BindReferenceToTemporary : SK_BindReference;
3601 S.Type = T;
3602 Steps.push_back(S);
3603}
3604
3605void InitializationSequence::AddFinalCopy(QualType T) {
3606 Step S;
3607 S.Kind = SK_FinalCopy;
3608 S.Type = T;
3609 Steps.push_back(S);
3610}
3611
3612void InitializationSequence::AddExtraneousCopyToTemporary(QualType T) {
3613 Step S;
3614 S.Kind = SK_ExtraneousCopyToTemporary;
3615 S.Type = T;
3616 Steps.push_back(S);
3617}
3618
3619void
3620InitializationSequence::AddUserConversionStep(FunctionDecl *Function,
3621 DeclAccessPair FoundDecl,
3622 QualType T,
3623 bool HadMultipleCandidates) {
3624 Step S;
3625 S.Kind = SK_UserConversion;
3626 S.Type = T;
3627 S.Function.HadMultipleCandidates = HadMultipleCandidates;
3628 S.Function.Function = Function;
3629 S.Function.FoundDecl = FoundDecl;
3630 Steps.push_back(S);
3631}
3632
3633void InitializationSequence::AddQualificationConversionStep(QualType Ty,
3634 ExprValueKind VK) {
3635 Step S;
3636 S.Kind = SK_QualificationConversionPRValue; // work around a gcc warning
3637 switch (VK) {
3638 case VK_PRValue:
3639 S.Kind = SK_QualificationConversionPRValue;
3640 break;
3641 case VK_XValue:
3642 S.Kind = SK_QualificationConversionXValue;
3643 break;
3644 case VK_LValue:
3645 S.Kind = SK_QualificationConversionLValue;
3646 break;
3647 }
3648 S.Type = Ty;
3649 Steps.push_back(S);
3650}
3651
3652void InitializationSequence::AddFunctionReferenceConversionStep(QualType Ty) {
3653 Step S;
3654 S.Kind = SK_FunctionReferenceConversion;
3655 S.Type = Ty;
3656 Steps.push_back(S);
3657}
3658
3659void InitializationSequence::AddAtomicConversionStep(QualType Ty) {
3660 Step S;
3661 S.Kind = SK_AtomicConversion;
3662 S.Type = Ty;
3663 Steps.push_back(S);
3664}
3665
3666void InitializationSequence::AddConversionSequenceStep(
3667 const ImplicitConversionSequence &ICS, QualType T,
3668 bool TopLevelOfInitList) {
3669 Step S;
3670 S.Kind = TopLevelOfInitList ? SK_ConversionSequenceNoNarrowing
3671 : SK_ConversionSequence;
3672 S.Type = T;
3673 S.ICS = new ImplicitConversionSequence(ICS);
3674 Steps.push_back(S);
3675}
3676
3677void InitializationSequence::AddListInitializationStep(QualType T) {
3678 Step S;
3679 S.Kind = SK_ListInitialization;
3680 S.Type = T;
3681 Steps.push_back(S);
3682}
3683
3684void InitializationSequence::AddConstructorInitializationStep(
3685 DeclAccessPair FoundDecl, CXXConstructorDecl *Constructor, QualType T,
3686 bool HadMultipleCandidates, bool FromInitList, bool AsInitList) {
3687 Step S;
3688 S.Kind = FromInitList ? AsInitList ? SK_StdInitializerListConstructorCall
3689 : SK_ConstructorInitializationFromList
3690 : SK_ConstructorInitialization;
3691 S.Type = T;
3692 S.Function.HadMultipleCandidates = HadMultipleCandidates;
3693 S.Function.Function = Constructor;
3694 S.Function.FoundDecl = FoundDecl;
3695 Steps.push_back(S);
3696}
3697
3698void InitializationSequence::AddZeroInitializationStep(QualType T) {
3699 Step S;
3700 S.Kind = SK_ZeroInitialization;
3701 S.Type = T;
3702 Steps.push_back(S);
3703}
3704
3705void InitializationSequence::AddCAssignmentStep(QualType T) {
3706 Step S;
3707 S.Kind = SK_CAssignment;
3708 S.Type = T;
3709 Steps.push_back(S);
3710}
3711
3712void InitializationSequence::AddStringInitStep(QualType T) {
3713 Step S;
3714 S.Kind = SK_StringInit;
3715 S.Type = T;
3716 Steps.push_back(S);
3717}
3718
3719void InitializationSequence::AddObjCObjectConversionStep(QualType T) {
3720 Step S;
3721 S.Kind = SK_ObjCObjectConversion;
3722 S.Type = T;
3723 Steps.push_back(S);
3724}
3725
3726void InitializationSequence::AddArrayInitStep(QualType T, bool IsGNUExtension) {
3727 Step S;
3728 S.Kind = IsGNUExtension ? SK_GNUArrayInit : SK_ArrayInit;
3729 S.Type = T;
3730 Steps.push_back(S);
3731}
3732
3733void InitializationSequence::AddArrayInitLoopStep(QualType T, QualType EltT) {
3734 Step S;
3735 S.Kind = SK_ArrayLoopIndex;
3736 S.Type = EltT;
3737 Steps.insert(Steps.begin(), S);
3738
3739 S.Kind = SK_ArrayLoopInit;
3740 S.Type = T;
3741 Steps.push_back(S);
3742}
3743
3744void InitializationSequence::AddParenthesizedArrayInitStep(QualType T) {
3745 Step S;
3746 S.Kind = SK_ParenthesizedArrayInit;
3747 S.Type = T;
3748 Steps.push_back(S);
3749}
3750
3751void InitializationSequence::AddPassByIndirectCopyRestoreStep(QualType type,
3752 bool shouldCopy) {
3753 Step s;
3754 s.Kind = (shouldCopy ? SK_PassByIndirectCopyRestore
3755 : SK_PassByIndirectRestore);
3756 s.Type = type;
3757 Steps.push_back(s);
3758}
3759
3760void InitializationSequence::AddProduceObjCObjectStep(QualType T) {
3761 Step S;
3762 S.Kind = SK_ProduceObjCObject;
3763 S.Type = T;
3764 Steps.push_back(S);
3765}
3766
3767void InitializationSequence::AddStdInitializerListConstructionStep(QualType T) {
3768 Step S;
3769 S.Kind = SK_StdInitializerList;
3770 S.Type = T;
3771 Steps.push_back(S);
3772}
3773
3774void InitializationSequence::AddOCLSamplerInitStep(QualType T) {
3775 Step S;
3776 S.Kind = SK_OCLSamplerInit;
3777 S.Type = T;
3778 Steps.push_back(S);
3779}
3780
3781void InitializationSequence::AddOCLZeroOpaqueTypeStep(QualType T) {
3782 Step S;
3783 S.Kind = SK_OCLZeroOpaqueType;
3784 S.Type = T;
3785 Steps.push_back(S);
3786}
3787
3788void InitializationSequence::RewrapReferenceInitList(QualType T,
3789 InitListExpr *Syntactic) {
3790 assert(Syntactic->getNumInits() == 1 &&((void)0)
3791 "Can only rewrap trivial init lists.")((void)0);
3792 Step S;
3793 S.Kind = SK_UnwrapInitList;
3794 S.Type = Syntactic->getInit(0)->getType();
3795 Steps.insert(Steps.begin(), S);
3796
3797 S.Kind = SK_RewrapInitList;
3798 S.Type = T;
3799 S.WrappingSyntacticList = Syntactic;
3800 Steps.push_back(S);
3801}
3802
3803void InitializationSequence::SetOverloadFailure(FailureKind Failure,
3804 OverloadingResult Result) {
3805 setSequenceKind(FailedSequence);
3806 this->Failure = Failure;
3807 this->FailedOverloadResult = Result;
3808}
3809
3810//===----------------------------------------------------------------------===//
3811// Attempt initialization
3812//===----------------------------------------------------------------------===//
3813
3814/// Tries to add a zero initializer. Returns true if that worked.
3815static bool
3816maybeRecoverWithZeroInitialization(Sema &S, InitializationSequence &Sequence,
3817 const InitializedEntity &Entity) {
3818 if (Entity.getKind() != InitializedEntity::EK_Variable)
3819 return false;
3820
3821 VarDecl *VD = cast<VarDecl>(Entity.getDecl());
3822 if (VD->getInit() || VD->getEndLoc().isMacroID())
3823 return false;
3824
3825 QualType VariableTy = VD->getType().getCanonicalType();
3826 SourceLocation Loc = S.getLocForEndOfToken(VD->getEndLoc());
3827 std::string Init = S.getFixItZeroInitializerForType(VariableTy, Loc);
3828 if (!Init.empty()) {
3829 Sequence.AddZeroInitializationStep(Entity.getType());
3830 Sequence.SetZeroInitializationFixit(Init, Loc);
3831 return true;
3832 }
3833 return false;
3834}
3835
3836static void MaybeProduceObjCObject(Sema &S,
3837 InitializationSequence &Sequence,
3838 const InitializedEntity &Entity) {
3839 if (!S.getLangOpts().ObjCAutoRefCount) return;
3840
3841 /// When initializing a parameter, produce the value if it's marked
3842 /// __attribute__((ns_consumed)).
3843 if (Entity.isParameterKind()) {
3844 if (!Entity.isParameterConsumed())
3845 return;
3846
3847 assert(Entity.getType()->isObjCRetainableType() &&((void)0)
3848 "consuming an object of unretainable type?")((void)0);
3849 Sequence.AddProduceObjCObjectStep(Entity.getType());
3850
3851 /// When initializing a return value, if the return type is a
3852 /// retainable type, then returns need to immediately retain the
3853 /// object. If an autorelease is required, it will be done at the
3854 /// last instant.
3855 } else if (Entity.getKind() == InitializedEntity::EK_Result ||
3856 Entity.getKind() == InitializedEntity::EK_StmtExprResult) {
3857 if (!Entity.getType()->isObjCRetainableType())
3858 return;
3859
3860 Sequence.AddProduceObjCObjectStep(Entity.getType());
3861 }
3862}
3863
3864static void TryListInitialization(Sema &S,
3865 const InitializedEntity &Entity,
3866 const InitializationKind &Kind,
3867 InitListExpr *InitList,
3868 InitializationSequence &Sequence,
3869 bool TreatUnavailableAsInvalid);
3870
3871/// When initializing from init list via constructor, handle
3872/// initialization of an object of type std::initializer_list<T>.
3873///
3874/// \return true if we have handled initialization of an object of type
3875/// std::initializer_list<T>, false otherwise.
3876static bool TryInitializerListConstruction(Sema &S,
3877 InitListExpr *List,
3878 QualType DestType,
3879 InitializationSequence &Sequence,
3880 bool TreatUnavailableAsInvalid) {
3881 QualType E;
3882 if (!S.isStdInitializerList(DestType, &E))
3883 return false;
3884
3885 if (!S.isCompleteType(List->getExprLoc(), E)) {
3886 Sequence.setIncompleteTypeFailure(E);
3887 return true;
3888 }
3889
3890 // Try initializing a temporary array from the init list.
3891 QualType ArrayType = S.Context.getConstantArrayType(
3892 E.withConst(),
3893 llvm::APInt(S.Context.getTypeSize(S.Context.getSizeType()),
3894 List->getNumInits()),
3895 nullptr, clang::ArrayType::Normal, 0);
3896 InitializedEntity HiddenArray =
3897 InitializedEntity::InitializeTemporary(ArrayType);
3898 InitializationKind Kind = InitializationKind::CreateDirectList(
3899 List->getExprLoc(), List->getBeginLoc(), List->getEndLoc());
3900 TryListInitialization(S, HiddenArray, Kind, List, Sequence,
3901 TreatUnavailableAsInvalid);
3902 if (Sequence)
3903 Sequence.AddStdInitializerListConstructionStep(DestType);
3904 return true;
3905}
3906
3907/// Determine if the constructor has the signature of a copy or move
3908/// constructor for the type T of the class in which it was found. That is,
3909/// determine if its first parameter is of type T or reference to (possibly
3910/// cv-qualified) T.
3911static bool hasCopyOrMoveCtorParam(ASTContext &Ctx,
3912 const ConstructorInfo &Info) {
3913 if (Info.Constructor->getNumParams() == 0)
3914 return false;
3915
3916 QualType ParmT =
3917 Info.Constructor->getParamDecl(0)->getType().getNonReferenceType();
3918 QualType ClassT =
3919 Ctx.getRecordType(cast<CXXRecordDecl>(Info.FoundDecl->getDeclContext()));
3920
3921 return Ctx.hasSameUnqualifiedType(ParmT, ClassT);
3922}
3923
3924static OverloadingResult
3925ResolveConstructorOverload(Sema &S, SourceLocation DeclLoc,
3926 MultiExprArg Args,
3927 OverloadCandidateSet &CandidateSet,
3928 QualType DestType,
3929 DeclContext::lookup_result Ctors,
3930 OverloadCandidateSet::iterator &Best,
3931 bool CopyInitializing, bool AllowExplicit,
3932 bool OnlyListConstructors, bool IsListInit,
3933 bool SecondStepOfCopyInit = false) {
3934 CandidateSet.clear(OverloadCandidateSet::CSK_InitByConstructor);
3935 CandidateSet.setDestAS(DestType.getQualifiers().getAddressSpace());
3936
3937 for (NamedDecl *D : Ctors) {
3938 auto Info = getConstructorInfo(D);
3939 if (!Info.Constructor || Info.Constructor->isInvalidDecl())
3940 continue;
3941
3942 if (OnlyListConstructors && !S.isInitListConstructor(Info.Constructor))
3943 continue;
3944
3945 // C++11 [over.best.ics]p4:
3946 // ... and the constructor or user-defined conversion function is a
3947 // candidate by
3948 // - 13.3.1.3, when the argument is the temporary in the second step
3949 // of a class copy-initialization, or
3950 // - 13.3.1.4, 13.3.1.5, or 13.3.1.6 (in all cases), [not handled here]
3951 // - the second phase of 13.3.1.7 when the initializer list has exactly
3952 // one element that is itself an initializer list, and the target is
3953 // the first parameter of a constructor of class X, and the conversion
3954 // is to X or reference to (possibly cv-qualified X),
3955 // user-defined conversion sequences are not considered.
3956 bool SuppressUserConversions =
3957 SecondStepOfCopyInit ||
3958 (IsListInit && Args.size() == 1 && isa<InitListExpr>(Args[0]) &&
3959 hasCopyOrMoveCtorParam(S.Context, Info));
3960
3961 if (Info.ConstructorTmpl)
3962 S.AddTemplateOverloadCandidate(
3963 Info.ConstructorTmpl, Info.FoundDecl,
3964 /*ExplicitArgs*/ nullptr, Args, CandidateSet, SuppressUserConversions,
3965 /*PartialOverloading=*/false, AllowExplicit);
3966 else {
3967 // C++ [over.match.copy]p1:
3968 // - When initializing a temporary to be bound to the first parameter
3969 // of a constructor [for type T] that takes a reference to possibly
3970 // cv-qualified T as its first argument, called with a single
3971 // argument in the context of direct-initialization, explicit
3972 // conversion functions are also considered.
3973 // FIXME: What if a constructor template instantiates to such a signature?
3974 bool AllowExplicitConv = AllowExplicit && !CopyInitializing &&
3975 Args.size() == 1 &&
3976 hasCopyOrMoveCtorParam(S.Context, Info);
3977 S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl, Args,
3978 CandidateSet, SuppressUserConversions,
3979 /*PartialOverloading=*/false, AllowExplicit,
3980 AllowExplicitConv);
3981 }
3982 }
3983
3984 // FIXME: Work around a bug in C++17 guaranteed copy elision.
3985 //
3986 // When initializing an object of class type T by constructor
3987 // ([over.match.ctor]) or by list-initialization ([over.match.list])
3988 // from a single expression of class type U, conversion functions of
3989 // U that convert to the non-reference type cv T are candidates.
3990 // Explicit conversion functions are only candidates during
3991 // direct-initialization.
3992 //
3993 // Note: SecondStepOfCopyInit is only ever true in this case when
3994 // evaluating whether to produce a C++98 compatibility warning.
3995 if (S.getLangOpts().CPlusPlus17 && Args.size() == 1 &&
3996 !SecondStepOfCopyInit) {
3997 Expr *Initializer = Args[0];
3998 auto *SourceRD = Initializer->getType()->getAsCXXRecordDecl();
3999 if (SourceRD && S.isCompleteType(DeclLoc, Initializer->getType())) {
4000 const auto &Conversions = SourceRD->getVisibleConversionFunctions();
4001 for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) {
4002 NamedDecl *D = *I;
4003 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
4004 D = D->getUnderlyingDecl();
4005
4006 FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
4007 CXXConversionDecl *Conv;
4008 if (ConvTemplate)
4009 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
4010 else
4011 Conv = cast<CXXConversionDecl>(D);
4012
4013 if (ConvTemplate)
4014 S.AddTemplateConversionCandidate(
4015 ConvTemplate, I.getPair(), ActingDC, Initializer, DestType,
4016 CandidateSet, AllowExplicit, AllowExplicit,
4017 /*AllowResultConversion*/ false);
4018 else
4019 S.AddConversionCandidate(Conv, I.getPair(), ActingDC, Initializer,
4020 DestType, CandidateSet, AllowExplicit,
4021 AllowExplicit,
4022 /*AllowResultConversion*/ false);
4023 }
4024 }
4025 }
4026
4027 // Perform overload resolution and return the result.
4028 return CandidateSet.BestViableFunction(S, DeclLoc, Best);
4029}
4030
4031/// Attempt initialization by constructor (C++ [dcl.init]), which
4032/// enumerates the constructors of the initialized entity and performs overload
4033/// resolution to select the best.
4034/// \param DestType The destination class type.
4035/// \param DestArrayType The destination type, which is either DestType or
4036/// a (possibly multidimensional) array of DestType.
4037/// \param IsListInit Is this list-initialization?
4038/// \param IsInitListCopy Is this non-list-initialization resulting from a
4039/// list-initialization from {x} where x is the same
4040/// type as the entity?
4041static void TryConstructorInitialization(Sema &S,
4042 const InitializedEntity &Entity,
4043 const InitializationKind &Kind,
4044 MultiExprArg Args, QualType DestType,
4045 QualType DestArrayType,
4046 InitializationSequence &Sequence,
4047 bool IsListInit = false,
4048 bool IsInitListCopy = false) {
4049 assert(((!IsListInit && !IsInitListCopy) ||((void)0)
4050 (Args.size() == 1 && isa<InitListExpr>(Args[0]))) &&((void)0)
4051 "IsListInit/IsInitListCopy must come with a single initializer list "((void)0)
4052 "argument.")((void)0);
4053 InitListExpr *ILE =
4054 (IsListInit || IsInitListCopy) ? cast<InitListExpr>(Args[0]) : nullptr;
4055 MultiExprArg UnwrappedArgs =
4056 ILE ? MultiExprArg(ILE->getInits(), ILE->getNumInits()) : Args;
4057
4058 // The type we're constructing needs to be complete.
4059 if (!S.isCompleteType(Kind.getLocation(), DestType)) {
4060 Sequence.setIncompleteTypeFailure(DestType);
4061 return;
4062 }
4063
4064 // C++17 [dcl.init]p17:
4065 // - If the initializer expression is a prvalue and the cv-unqualified
4066 // version of the source type is the same class as the class of the
4067 // destination, the initializer expression is used to initialize the
4068 // destination object.
4069 // Per DR (no number yet), this does not apply when initializing a base
4070 // class or delegating to another constructor from a mem-initializer.
4071 // ObjC++: Lambda captured by the block in the lambda to block conversion
4072 // should avoid copy elision.
4073 if (S.getLangOpts().CPlusPlus17 &&
4074 Entity.getKind() != InitializedEntity::EK_Base &&
4075 Entity.getKind() != InitializedEntity::EK_Delegating &&
4076 Entity.getKind() !=
4077 InitializedEntity::EK_LambdaToBlockConversionBlockElement &&
4078 UnwrappedArgs.size() == 1 && UnwrappedArgs[0]->isPRValue() &&
4079 S.Context.hasSameUnqualifiedType(UnwrappedArgs[0]->getType(), DestType)) {
4080 // Convert qualifications if necessary.
4081 Sequence.AddQualificationConversionStep(DestType, VK_PRValue);
4082 if (ILE)
4083 Sequence.RewrapReferenceInitList(DestType, ILE);
4084 return;
4085 }
4086
4087 const RecordType *DestRecordType = DestType->getAs<RecordType>();
4088 assert(DestRecordType && "Constructor initialization requires record type")((void)0);
4089 CXXRecordDecl *DestRecordDecl
4090 = cast<CXXRecordDecl>(DestRecordType->getDecl());
4091
4092 // Build the candidate set directly in the initialization sequence
4093 // structure, so that it will persist if we fail.
4094 OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
4095
4096 // Determine whether we are allowed to call explicit constructors or
4097 // explicit conversion operators.
4098 bool AllowExplicit = Kind.AllowExplicit() || IsListInit;
4099 bool CopyInitialization = Kind.getKind() == InitializationKind::IK_Copy;
4100
4101 // - Otherwise, if T is a class type, constructors are considered. The
4102 // applicable constructors are enumerated, and the best one is chosen
4103 // through overload resolution.
4104 DeclContext::lookup_result Ctors = S.LookupConstructors(DestRecordDecl);
4105
4106 OverloadingResult Result = OR_No_Viable_Function;
4107 OverloadCandidateSet::iterator Best;
4108 bool AsInitializerList = false;
4109
4110 // C++11 [over.match.list]p1, per DR1467:
4111 // When objects of non-aggregate type T are list-initialized, such that
4112 // 8.5.4 [dcl.init.list] specifies that overload resolution is performed
4113 // according to the rules in this section, overload resolution selects
4114 // the constructor in two phases:
4115 //
4116 // - Initially, the candidate functions are the initializer-list
4117 // constructors of the class T and the argument list consists of the
4118 // initializer list as a single argument.
4119 if (IsListInit) {
4120 AsInitializerList = true;
4121
4122 // If the initializer list has no elements and T has a default constructor,
4123 // the first phase is omitted.
4124 if (!(UnwrappedArgs.empty() && S.LookupDefaultConstructor(DestRecordDecl)))
4125 Result = ResolveConstructorOverload(S, Kind.getLocation(), Args,
4126 CandidateSet, DestType, Ctors, Best,
4127 CopyInitialization, AllowExplicit,
4128 /*OnlyListConstructors=*/true,
4129 IsListInit);
4130 }
4131
4132 // C++11 [over.match.list]p1:
4133 // - If no viable initializer-list constructor is found, overload resolution
4134 // is performed again, where the candidate functions are all the
4135 // constructors of the class T and the argument list consists of the
4136 // elements of the initializer list.
4137 if (Result == OR_No_Viable_Function) {
4138 AsInitializerList = false;
4139 Result = ResolveConstructorOverload(S, Kind.getLocation(), UnwrappedArgs,
4140 CandidateSet, DestType, Ctors, Best,
4141 CopyInitialization, AllowExplicit,
4142 /*OnlyListConstructors=*/false,
4143 IsListInit);
4144 }
4145 if (Result) {
4146 Sequence.SetOverloadFailure(
4147 IsListInit ? InitializationSequence::FK_ListConstructorOverloadFailed
4148 : InitializationSequence::FK_ConstructorOverloadFailed,
4149 Result);
4150
4151 if (Result != OR_Deleted)
4152 return;
4153 }
4154
4155 bool HadMultipleCandidates = (CandidateSet.size() > 1);
4156
4157 // In C++17, ResolveConstructorOverload can select a conversion function
4158 // instead of a constructor.
4159 if (auto *CD = dyn_cast<CXXConversionDecl>(Best->Function)) {
4160 // Add the user-defined conversion step that calls the conversion function.
4161 QualType ConvType = CD->getConversionType();
4162 assert(S.Context.hasSameUnqualifiedType(ConvType, DestType) &&((void)0)
4163 "should not have selected this conversion function")((void)0);
4164 Sequence.AddUserConversionStep(CD, Best->FoundDecl, ConvType,
4165 HadMultipleCandidates);
4166 if (!S.Context.hasSameType(ConvType, DestType))
4167 Sequence.AddQualificationConversionStep(DestType, VK_PRValue);
4168 if (IsListInit)
4169 Sequence.RewrapReferenceInitList(Entity.getType(), ILE);
4170 return;
4171 }
4172
4173 CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
4174 if (Result != OR_Deleted) {
4175 // C++11 [dcl.init]p6:
4176 // If a program calls for the default initialization of an object
4177 // of a const-qualified type T, T shall be a class type with a
4178 // user-provided default constructor.
4179 // C++ core issue 253 proposal:
4180 // If the implicit default constructor initializes all subobjects, no
4181 // initializer should be required.
4182 // The 253 proposal is for example needed to process libstdc++ headers
4183 // in 5.x.
4184 if (Kind.getKind() == InitializationKind::IK_Default &&
4185 Entity.getType().isConstQualified()) {
4186 if (!CtorDecl->getParent()->allowConstDefaultInit()) {
4187 if (!maybeRecoverWithZeroInitialization(S, Sequence, Entity))
4188 Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst);
4189 return;
4190 }
4191 }
4192
4193 // C++11 [over.match.list]p1:
4194 // In copy-list-initialization, if an explicit constructor is chosen, the
4195 // initializer is ill-formed.
4196 if (IsListInit && !Kind.AllowExplicit() && CtorDecl->isExplicit()) {
4197 Sequence.SetFailed(InitializationSequence::FK_ExplicitConstructor);
4198 return;
4199 }
4200 }
4201
4202 // [class.copy.elision]p3:
4203 // In some copy-initialization contexts, a two-stage overload resolution
4204 // is performed.
4205 // If the first overload resolution selects a deleted function, we also
4206 // need the initialization sequence to decide whether to perform the second
4207 // overload resolution.
4208 // For deleted functions in other contexts, there is no need to get the
4209 // initialization sequence.
4210 if (Result == OR_Deleted && Kind.getKind() != InitializationKind::IK_Copy)
4211 return;
4212
4213 // Add the constructor initialization step. Any cv-qualification conversion is
4214 // subsumed by the initialization.
4215 Sequence.AddConstructorInitializationStep(
4216 Best->FoundDecl, CtorDecl, DestArrayType, HadMultipleCandidates,
4217 IsListInit | IsInitListCopy, AsInitializerList);
4218}
4219
4220static bool
4221ResolveOverloadedFunctionForReferenceBinding(Sema &S,
4222 Expr *Initializer,
4223 QualType &SourceType,
4224 QualType &UnqualifiedSourceType,
4225 QualType UnqualifiedTargetType,
4226 InitializationSequence &Sequence) {
4227 if (S.Context.getCanonicalType(UnqualifiedSourceType) ==
4228 S.Context.OverloadTy) {
4229 DeclAccessPair Found;
4230 bool HadMultipleCandidates = false;
4231 if (FunctionDecl *Fn
4232 = S.ResolveAddressOfOverloadedFunction(Initializer,
4233 UnqualifiedTargetType,
4234 false, Found,
4235 &HadMultipleCandidates)) {
4236 Sequence.AddAddressOverloadResolutionStep(Fn, Found,
4237 HadMultipleCandidates);
4238 SourceType = Fn->getType();
4239 UnqualifiedSourceType = SourceType.getUnqualifiedType();
4240 } else if (!UnqualifiedTargetType->isRecordType()) {
4241 Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
4242 return true;
4243 }
4244 }
4245 return false;
4246}
4247
4248static void TryReferenceInitializationCore(Sema &S,
4249 const InitializedEntity &Entity,
4250 const InitializationKind &Kind,
4251 Expr *Initializer,
4252 QualType cv1T1, QualType T1,
4253 Qualifiers T1Quals,
4254 QualType cv2T2, QualType T2,
4255 Qualifiers T2Quals,
4256 InitializationSequence &Sequence);
4257
4258static void TryValueInitialization(Sema &S,
4259 const InitializedEntity &Entity,
4260 const InitializationKind &Kind,
4261 InitializationSequence &Sequence,
4262 InitListExpr *InitList = nullptr);
4263
4264/// Attempt list initialization of a reference.
4265static void TryReferenceListInitialization(Sema &S,
4266 const InitializedEntity &Entity,
4267 const InitializationKind &Kind,
4268 InitListExpr *InitList,
4269 InitializationSequence &Sequence,
4270 bool TreatUnavailableAsInvalid) {
4271 // First, catch C++03 where this isn't possible.
4272 if (!S.getLangOpts().CPlusPlus11) {
4273 Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList);
4274 return;
4275 }
4276 // Can't reference initialize a compound literal.
4277 if (Entity.getKind() == InitializedEntity::EK_CompoundLiteralInit) {
4278 Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList);
4279 return;
4280 }
4281
4282 QualType DestType = Entity.getType();
4283 QualType cv1T1 = DestType->castAs<ReferenceType>()->getPointeeType();
4284 Qualifiers T1Quals;
4285 QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals);
4286
4287 // Reference initialization via an initializer list works thus:
4288 // If the initializer list consists of a single element that is
4289 // reference-related to the referenced type, bind directly to that element
4290 // (possibly creating temporaries).
4291 // Otherwise, initialize a temporary with the initializer list and
4292 // bind to that.
4293 if (InitList->getNumInits() == 1) {
4294 Expr *Initializer = InitList->getInit(0);
4295 QualType cv2T2 = S.getCompletedType(Initializer);
4296 Qualifiers T2Quals;
4297 QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals);
4298
4299 // If this fails, creating a temporary wouldn't work either.
4300 if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2,
4301 T1, Sequence))
4302 return;
4303
4304 SourceLocation DeclLoc = Initializer->getBeginLoc();
4305 Sema::ReferenceCompareResult RefRelationship
4306 = S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2);
4307 if (RefRelationship >= Sema::Ref_Related) {
4308 // Try to bind the reference here.
4309 TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1,
4310 T1Quals, cv2T2, T2, T2Quals, Sequence);
4311 if (Sequence)
4312 Sequence.RewrapReferenceInitList(cv1T1, InitList);
4313 return;
4314 }
4315
4316 // Update the initializer if we've resolved an overloaded function.
4317 if (Sequence.step_begin() != Sequence.step_end())
4318 Sequence.RewrapReferenceInitList(cv1T1, InitList);
4319 }
4320 // Perform address space compatibility check.
4321 QualType cv1T1IgnoreAS = cv1T1;
4322 if (T1Quals.hasAddressSpace()) {
4323 Qualifiers T2Quals;
4324 (void)S.Context.getUnqualifiedArrayType(InitList->getType(), T2Quals);
4325 if (!T1Quals.isAddressSpaceSupersetOf(T2Quals)) {
4326 Sequence.SetFailed(
4327 InitializationSequence::FK_ReferenceInitDropsQualifiers);
4328 return;
4329 }
4330 // Ignore address space of reference type at this point and perform address
4331 // space conversion after the reference binding step.
4332 cv1T1IgnoreAS =
4333 S.Context.getQualifiedType(T1, T1Quals.withoutAddressSpace());
4334 }
4335 // Not reference-related. Create a temporary and bind to that.
4336 InitializedEntity TempEntity =
4337 InitializedEntity::InitializeTemporary(cv1T1IgnoreAS);
4338
4339 TryListInitialization(S, TempEntity, Kind, InitList, Sequence,
4340 TreatUnavailableAsInvalid);
4341 if (Sequence) {
4342 if (DestType->isRValueReferenceType() ||
4343 (T1Quals.hasConst() && !T1Quals.hasVolatile())) {
4344 Sequence.AddReferenceBindingStep(cv1T1IgnoreAS,
4345 /*BindingTemporary=*/true);
4346 if (T1Quals.hasAddressSpace())
4347 Sequence.AddQualificationConversionStep(
4348 cv1T1, DestType->isRValueReferenceType() ? VK_XValue : VK_LValue);
4349 } else
4350 Sequence.SetFailed(
4351 InitializationSequence::FK_NonConstLValueReferenceBindingToTemporary);
4352 }
4353}
4354
4355/// Attempt list initialization (C++0x [dcl.init.list])
4356static void TryListInitialization(Sema &S,
4357 const InitializedEntity &Entity,
4358 const InitializationKind &Kind,
4359 InitListExpr *InitList,
4360 InitializationSequence &Sequence,
4361 bool TreatUnavailableAsInvalid) {
4362 QualType DestType = Entity.getType();
4363
4364 // C++ doesn't allow scalar initialization with more than one argument.
4365 // But C99 complex numbers are scalars and it makes sense there.
4366 if (S.getLangOpts().CPlusPlus && DestType->isScalarType() &&
4367 !DestType->isAnyComplexType() && InitList->getNumInits() > 1) {
4368 Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForScalar);
4369 return;
4370 }
4371 if (DestType->isReferenceType()) {
4372 TryReferenceListInitialization(S, Entity, Kind, InitList, Sequence,
4373 TreatUnavailableAsInvalid);
4374 return;
4375 }
4376
4377 if (DestType->isRecordType() &&
4378 !S.isCompleteType(InitList->getBeginLoc(), DestType)) {
4379 Sequence.setIncompleteTypeFailure(DestType);
4380 return;
4381 }
4382
4383 // C++11 [dcl.init.list]p3, per DR1467:
4384 // - If T is a class type and the initializer list has a single element of
4385 // type cv U, where U is T or a class derived from T, the object is
4386 // initialized from that element (by copy-initialization for
4387 // copy-list-initialization, or by direct-initialization for
4388 // direct-list-initialization).
4389 // - Otherwise, if T is a character array and the initializer list has a
4390 // single element that is an appropriately-typed string literal
4391 // (8.5.2 [dcl.init.string]), initialization is performed as described
4392 // in that section.
4393 // - Otherwise, if T is an aggregate, [...] (continue below).
4394 if (S.getLangOpts().CPlusPlus11 && InitList->getNumInits() == 1) {
4395 if (DestType->isRecordType()) {
4396 QualType InitType = InitList->getInit(0)->getType();
4397 if (S.Context.hasSameUnqualifiedType(InitType, DestType) ||
4398 S.IsDerivedFrom(InitList->getBeginLoc(), InitType, DestType)) {
4399 Expr *InitListAsExpr = InitList;
4400 TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType,
4401 DestType, Sequence,
4402 /*InitListSyntax*/false,
4403 /*IsInitListCopy*/true);
4404 return;
4405 }
4406 }
4407 if (const ArrayType *DestAT = S.Context.getAsArrayType(DestType)) {
4408 Expr *SubInit[1] = {InitList->getInit(0)};
4409 if (!isa<VariableArrayType>(DestAT) &&
4410 IsStringInit(SubInit[0], DestAT, S.Context) == SIF_None) {
4411 InitializationKind SubKind =
4412 Kind.getKind() == InitializationKind::IK_DirectList
4413 ? InitializationKind::CreateDirect(Kind.getLocation(),
4414 InitList->getLBraceLoc(),
4415 InitList->getRBraceLoc())
4416 : Kind;
4417 Sequence.InitializeFrom(S, Entity, SubKind, SubInit,
4418 /*TopLevelOfInitList*/ true,
4419 TreatUnavailableAsInvalid);
4420
4421 // TryStringLiteralInitialization() (in InitializeFrom()) will fail if
4422 // the element is not an appropriately-typed string literal, in which
4423 // case we should proceed as in C++11 (below).
4424 if (Sequence) {
4425 Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
4426 return;
4427 }
4428 }
4429 }
4430 }
4431
4432 // C++11 [dcl.init.list]p3:
4433 // - If T is an aggregate, aggregate initialization is performed.
4434 if ((DestType->isRecordType() && !DestType->isAggregateType()) ||
4435 (S.getLangOpts().CPlusPlus11 &&
4436 S.isStdInitializerList(DestType, nullptr))) {
4437 if (S.getLangOpts().CPlusPlus11) {
4438 // - Otherwise, if the initializer list has no elements and T is a
4439 // class type with a default constructor, the object is
4440 // value-initialized.
4441 if (InitList->getNumInits() == 0) {
4442 CXXRecordDecl *RD = DestType->getAsCXXRecordDecl();
4443 if (S.LookupDefaultConstructor(RD)) {
4444 TryValueInitialization(S, Entity, Kind, Sequence, InitList);
4445 return;
4446 }
4447 }
4448
4449 // - Otherwise, if T is a specialization of std::initializer_list<E>,
4450 // an initializer_list object constructed [...]
4451 if (TryInitializerListConstruction(S, InitList, DestType, Sequence,
4452 TreatUnavailableAsInvalid))
4453 return;
4454
4455 // - Otherwise, if T is a class type, constructors are considered.
4456 Expr *InitListAsExpr = InitList;
4457 TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType,
4458 DestType, Sequence, /*InitListSyntax*/true);
4459 } else
4460 Sequence.SetFailed(InitializationSequence::FK_InitListBadDestinationType);
4461 return;
4462 }
4463
4464 if (S.getLangOpts().CPlusPlus && !DestType->isAggregateType() &&
4465 InitList->getNumInits() == 1) {
4466 Expr *E = InitList->getInit(0);
4467
4468 // - Otherwise, if T is an enumeration with a fixed underlying type,
4469 // the initializer-list has a single element v, and the initialization
4470 // is direct-list-initialization, the object is initialized with the
4471 // value T(v); if a narrowing conversion is required to convert v to
4472 // the underlying type of T, the program is ill-formed.
4473 auto *ET = DestType->getAs<EnumType>();
4474 if (S.getLangOpts().CPlusPlus17 &&
4475 Kind.getKind() == InitializationKind::IK_DirectList &&
4476 ET && ET->getDecl()->isFixed() &&
4477 !S.Context.hasSameUnqualifiedType(E->getType(), DestType) &&
4478 (E->getType()->isIntegralOrEnumerationType() ||
4479 E->getType()->isFloatingType())) {
4480 // There are two ways that T(v) can work when T is an enumeration type.
4481 // If there is either an implicit conversion sequence from v to T or
4482 // a conversion function that can convert from v to T, then we use that.
4483 // Otherwise, if v is of integral, enumeration, or floating-point type,
4484 // it is converted to the enumeration type via its underlying type.
4485 // There is no overlap possible between these two cases (except when the
4486 // source value is already of the destination type), and the first
4487 // case is handled by the general case for single-element lists below.
4488 ImplicitConversionSequence ICS;
4489 ICS.setStandard();
4490 ICS.Standard.setAsIdentityConversion();
4491 if (!E->isPRValue())
4492 ICS.Standard.First = ICK_Lvalue_To_Rvalue;
4493 // If E is of a floating-point type, then the conversion is ill-formed
4494 // due to narrowing, but go through the motions in order to produce the
4495 // right diagnostic.
4496 ICS.Standard.Second = E->getType()->isFloatingType()
4497 ? ICK_Floating_Integral
4498 : ICK_Integral_Conversion;
4499 ICS.Standard.setFromType(E->getType());
4500 ICS.Standard.setToType(0, E->getType());
4501 ICS.Standard.setToType(1, DestType);
4502 ICS.Standard.setToType(2, DestType);
4503 Sequence.AddConversionSequenceStep(ICS, ICS.Standard.getToType(2),
4504 /*TopLevelOfInitList*/true);
4505 Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
4506 return;
4507 }
4508
4509 // - Otherwise, if the initializer list has a single element of type E
4510 // [...references are handled above...], the object or reference is
4511 // initialized from that element (by copy-initialization for
4512 // copy-list-initialization, or by direct-initialization for
4513 // direct-list-initialization); if a narrowing conversion is required
4514 // to convert the element to T, the program is ill-formed.
4515 //
4516 // Per core-24034, this is direct-initialization if we were performing
4517 // direct-list-initialization and copy-initialization otherwise.
4518 // We can't use InitListChecker for this, because it always performs
4519 // copy-initialization. This only matters if we might use an 'explicit'
4520 // conversion operator, or for the special case conversion of nullptr_t to
4521 // bool, so we only need to handle those cases.
4522 //
4523 // FIXME: Why not do this in all cases?
4524 Expr *Init = InitList->getInit(0);
4525 if (Init->getType()->isRecordType() ||
4526 (Init->getType()->isNullPtrType() && DestType->isBooleanType())) {
4527 InitializationKind SubKind =
4528 Kind.getKind() == InitializationKind::IK_DirectList
4529 ? InitializationKind::CreateDirect(Kind.getLocation(),
4530 InitList->getLBraceLoc(),
4531 InitList->getRBraceLoc())
4532 : Kind;
4533 Expr *SubInit[1] = { Init };
4534 Sequence.InitializeFrom(S, Entity, SubKind, SubInit,
4535 /*TopLevelOfInitList*/true,
4536 TreatUnavailableAsInvalid);
4537 if (Sequence)
4538 Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
4539 return;
4540 }
4541 }
4542
4543 InitListChecker CheckInitList(S, Entity, InitList,
4544 DestType, /*VerifyOnly=*/true, TreatUnavailableAsInvalid);
4545 if (CheckInitList.HadError()) {
4546 Sequence.SetFailed(InitializationSequence::FK_ListInitializationFailed);
4547 return;
4548 }
4549
4550 // Add the list initialization step with the built init list.
4551 Sequence.AddListInitializationStep(DestType);
4552}
4553
4554/// Try a reference initialization that involves calling a conversion
4555/// function.
4556static OverloadingResult TryRefInitWithConversionFunction(
4557 Sema &S, const InitializedEntity &Entity, const InitializationKind &Kind,
4558 Expr *Initializer, bool AllowRValues, bool IsLValueRef,
4559 InitializationSequence &Sequence) {
4560 QualType DestType = Entity.getType();
4561 QualType cv1T1 = DestType->castAs<ReferenceType>()->getPointeeType();
4562 QualType T1 = cv1T1.getUnqualifiedType();
4563 QualType cv2T2 = Initializer->getType();
4564 QualType T2 = cv2T2.getUnqualifiedType();
4565
4566 assert(!S.CompareReferenceRelationship(Initializer->getBeginLoc(), T1, T2) &&((void)0)
4567 "Must have incompatible references when binding via conversion")((void)0);
4568
4569 // Build the candidate set directly in the initialization sequence
4570 // structure, so that it will persist if we fail.
4571 OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
4572 CandidateSet.clear(OverloadCandidateSet::CSK_InitByUserDefinedConversion);
4573
4574 // Determine whether we are allowed to call explicit conversion operators.
4575 // Note that none of [over.match.copy], [over.match.conv], nor
4576 // [over.match.ref] permit an explicit constructor to be chosen when
4577 // initializing a reference, not even for direct-initialization.
4578 bool AllowExplicitCtors = false;
4579 bool AllowExplicitConvs = Kind.allowExplicitConversionFunctionsInRefBinding();
4580
4581 const RecordType *T1RecordType = nullptr;
4582 if (AllowRValues && (T1RecordType = T1->getAs<RecordType>()) &&
4583 S.isCompleteType(Kind.getLocation(), T1)) {
4584 // The type we're converting to is a class type. Enumerate its constructors
4585 // to see if there is a suitable conversion.
4586 CXXRecordDecl *T1RecordDecl = cast<CXXRecordDecl>(T1RecordType->getDecl());
4587
4588 for (NamedDecl *D : S.LookupConstructors(T1RecordDecl)) {
4589 auto Info = getConstructorInfo(D);
4590 if (!Info.Constructor)
4591 continue;
4592
4593 if (!Info.Constructor->isInvalidDecl() &&
4594 Info.Constructor->isConvertingConstructor(/*AllowExplicit*/true)) {
4595 if (Info.ConstructorTmpl)
4596 S.AddTemplateOverloadCandidate(
4597 Info.ConstructorTmpl, Info.FoundDecl,
4598 /*ExplicitArgs*/ nullptr, Initializer, CandidateSet,
4599 /*SuppressUserConversions=*/true,
4600 /*PartialOverloading*/ false, AllowExplicitCtors);
4601 else
4602 S.AddOverloadCandidate(
4603 Info.Constructor, Info.FoundDecl, Initializer, CandidateSet,
4604 /*SuppressUserConversions=*/true,
4605 /*PartialOverloading*/ false, AllowExplicitCtors);
4606 }
4607 }
4608 }
4609 if (T1RecordType && T1RecordType->getDecl()->isInvalidDecl())
4610 return OR_No_Viable_Function;
4611
4612 const RecordType *T2RecordType = nullptr;
4613 if ((T2RecordType = T2->getAs<RecordType>()) &&
4614 S.isCompleteType(Kind.getLocation(), T2)) {
4615 // The type we're converting from is a class type, enumerate its conversion
4616 // functions.
4617 CXXRecordDecl *T2RecordDecl = cast<CXXRecordDecl>(T2RecordType->getDecl());
4618
4619 const auto &Conversions = T2RecordDecl->getVisibleConversionFunctions();
4620 for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) {
4621 NamedDecl *D = *I;
4622 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
4623 if (isa<UsingShadowDecl>(D))
4624 D = cast<UsingShadowDecl>(D)->getTargetDecl();
4625
4626 FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
4627 CXXConversionDecl *Conv;
4628 if (ConvTemplate)
4629 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
4630 else
4631 Conv = cast<CXXConversionDecl>(D);
4632
4633 // If the conversion function doesn't return a reference type,
4634 // it can't be considered for this conversion unless we're allowed to
4635 // consider rvalues.
4636 // FIXME: Do we need to make sure that we only consider conversion
4637 // candidates with reference-compatible results? That might be needed to
4638 // break recursion.
4639 if ((AllowRValues ||
4640 Conv->getConversionType()->isLValueReferenceType())) {
4641 if (ConvTemplate)
4642 S.AddTemplateConversionCandidate(
4643 ConvTemplate, I.getPair(), ActingDC, Initializer, DestType,
4644 CandidateSet,
4645 /*AllowObjCConversionOnExplicit=*/false, AllowExplicitConvs);
4646 else
4647 S.AddConversionCandidate(
4648 Conv, I.getPair(), ActingDC, Initializer, DestType, CandidateSet,
4649 /*AllowObjCConversionOnExplicit=*/false, AllowExplicitConvs);
4650 }
4651 }
4652 }
4653 if (T2RecordType && T2RecordType->getDecl()->isInvalidDecl())
4654 return OR_No_Viable_Function;
4655
4656 SourceLocation DeclLoc = Initializer->getBeginLoc();
4657
4658 // Perform overload resolution. If it fails, return the failed result.
4659 OverloadCandidateSet::iterator Best;
4660 if (OverloadingResult Result
4661 = CandidateSet.BestViableFunction(S, DeclLoc, Best))
4662 return Result;
4663
4664 FunctionDecl *Function = Best->Function;
4665 // This is the overload that will be used for this initialization step if we
4666 // use this initialization. Mark it as referenced.
4667 Function->setReferenced();
4668
4669 // Compute the returned type and value kind of the conversion.
4670 QualType cv3T3;
4671 if (isa<CXXConversionDecl>(Function))
4672 cv3T3 = Function->getReturnType();
4673 else
4674 cv3T3 = T1;
4675
4676 ExprValueKind VK = VK_PRValue;
4677 if (cv3T3->isLValueReferenceType())
4678 VK = VK_LValue;
4679 else if (const auto *RRef = cv3T3->getAs<RValueReferenceType>())
4680 VK = RRef->getPointeeType()->isFunctionType() ? VK_LValue : VK_XValue;
4681 cv3T3 = cv3T3.getNonLValueExprType(S.Context);
4682
4683 // Add the user-defined conversion step.
4684 bool HadMultipleCandidates = (CandidateSet.size() > 1);
4685 Sequence.AddUserConversionStep(Function, Best->FoundDecl, cv3T3,
4686 HadMultipleCandidates);
4687
4688 // Determine whether we'll need to perform derived-to-base adjustments or
4689 // other conversions.
4690 Sema::ReferenceConversions RefConv;
4691 Sema::ReferenceCompareResult NewRefRelationship =
4692 S.CompareReferenceRelationship(DeclLoc, T1, cv3T3, &RefConv);
4693
4694 // Add the final conversion sequence, if necessary.
4695 if (NewRefRelationship == Sema::Ref_Incompatible) {
4696 assert(!isa<CXXConstructorDecl>(Function) &&((void)0)
4697 "should not have conversion after constructor")((void)0);
4698
4699 ImplicitConversionSequence ICS;
4700 ICS.setStandard();
4701 ICS.Standard = Best->FinalConversion;
4702 Sequence.AddConversionSequenceStep(ICS, ICS.Standard.getToType(2));
4703
4704 // Every implicit conversion results in a prvalue, except for a glvalue
4705 // derived-to-base conversion, which we handle below.
4706 cv3T3 = ICS.Standard.getToType(2);
4707 VK = VK_PRValue;
4708 }
4709
4710 // If the converted initializer is a prvalue, its type T4 is adjusted to
4711 // type "cv1 T4" and the temporary materialization conversion is applied.
4712 //
4713 // We adjust the cv-qualifications to match the reference regardless of
4714 // whether we have a prvalue so that the AST records the change. In this
4715 // case, T4 is "cv3 T3".
4716 QualType cv1T4 = S.Context.getQualifiedType(cv3T3, cv1T1.getQualifiers());
4717 if (cv1T4.getQualifiers() != cv3T3.getQualifiers())
4718 Sequence.AddQualificationConversionStep(cv1T4, VK);
4719 Sequence.AddReferenceBindingStep(cv1T4, VK == VK_PRValue);
4720 VK = IsLValueRef ? VK_LValue : VK_XValue;
4721
4722 if (RefConv & Sema::ReferenceConversions::DerivedToBase)
4723 Sequence.AddDerivedToBaseCastStep(cv1T1, VK);
4724 else if (RefConv & Sema::ReferenceConversions::ObjC)
4725 Sequence.AddObjCObjectConversionStep(cv1T1);
4726 else if (RefConv & Sema::ReferenceConversions::Function)
4727 Sequence.AddFunctionReferenceConversionStep(cv1T1);
4728 else if (RefConv & Sema::ReferenceConversions::Qualification) {
4729 if (!S.Context.hasSameType(cv1T4, cv1T1))
4730 Sequence.AddQualificationConversionStep(cv1T1, VK);
4731 }
4732
4733 return OR_Success;
4734}
4735
4736static void CheckCXX98CompatAccessibleCopy(Sema &S,
4737 const InitializedEntity &Entity,
4738 Expr *CurInitExpr);
4739
4740/// Attempt reference initialization (C++0x [dcl.init.ref])
4741static void TryReferenceInitialization(Sema &S,
4742 const InitializedEntity &Entity,
4743 const InitializationKind &Kind,
4744 Expr *Initializer,
4745 InitializationSequence &Sequence) {
4746 QualType DestType = Entity.getType();
4747 QualType cv1T1 = DestType->castAs<ReferenceType>()->getPointeeType();
4748 Qualifiers T1Quals;
4749 QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals);
4750 QualType cv2T2 = S.getCompletedType(Initializer);
4751 Qualifiers T2Quals;
4752 QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals);
4753
4754 // If the initializer is the address of an overloaded function, try
4755 // to resolve the overloaded function. If all goes well, T2 is the
4756 // type of the resulting function.
4757 if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2,
4758 T1, Sequence))
4759 return;
4760
4761 // Delegate everything else to a subfunction.
4762 TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1,
4763 T1Quals, cv2T2, T2, T2Quals, Sequence);
4764}
4765
4766/// Determine whether an expression is a non-referenceable glvalue (one to
4767/// which a reference can never bind). Attempting to bind a reference to
4768/// such a glvalue will always create a temporary.
4769static bool isNonReferenceableGLValue(Expr *E) {
4770 return E->refersToBitField() || E->refersToVectorElement() ||
4771 E->refersToMatrixElement();
4772}
4773
4774/// Reference initialization without resolving overloaded functions.
4775///
4776/// We also can get here in C if we call a builtin which is declared as
4777/// a function with a parameter of reference type (such as __builtin_va_end()).
4778static void TryReferenceInitializationCore(Sema &S,
4779 const InitializedEntity &Entity,
4780 const InitializationKind &Kind,
4781 Expr *Initializer,
4782 QualType cv1T1, QualType T1,
4783 Qualifiers T1Quals,
4784 QualType cv2T2, QualType T2,
4785 Qualifiers T2Quals,
4786 InitializationSequence &Sequence) {
4787 QualType DestType = Entity.getType();
4788 SourceLocation DeclLoc = Initializer->getBeginLoc();
4789
4790 // Compute some basic properties of the types and the initializer.
4791 bool isLValueRef = DestType->isLValueReferenceType();
4792 bool isRValueRef = !isLValueRef;
4793 Expr::Classification InitCategory = Initializer->Classify(S.Context);
4794
4795 Sema::ReferenceConversions RefConv;
4796 Sema::ReferenceCompareResult RefRelationship =
4797 S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2, &RefConv);
4798
4799 // C++0x [dcl.init.ref]p5:
4800 // A reference to type "cv1 T1" is initialized by an expression of type
4801 // "cv2 T2" as follows:
4802 //
4803 // - If the reference is an lvalue reference and the initializer
4804 // expression
4805 // Note the analogous bullet points for rvalue refs to functions. Because
4806 // there are no function rvalues in C++, rvalue refs to functions are treated
4807 // like lvalue refs.
4808 OverloadingResult ConvOvlResult = OR_Success;
4809 bool T1Function = T1->isFunctionType();
4810 if (isLValueRef || T1Function) {
4811 if (InitCategory.isLValue() && !isNonReferenceableGLValue(Initializer) &&
4812 (RefRelationship == Sema::Ref_Compatible ||
4813 (Kind.isCStyleOrFunctionalCast() &&
4814 RefRelationship == Sema::Ref_Related))) {
4815 // - is an lvalue (but is not a bit-field), and "cv1 T1" is
4816 // reference-compatible with "cv2 T2," or
4817 if (RefConv & (Sema::ReferenceConversions::DerivedToBase |
4818 Sema::ReferenceConversions::ObjC)) {
4819 // If we're converting the pointee, add any qualifiers first;
4820 // these qualifiers must all be top-level, so just convert to "cv1 T2".
4821 if (RefConv & (Sema::ReferenceConversions::Qualification))
4822 Sequence.AddQualificationConversionStep(
4823 S.Context.getQualifiedType(T2, T1Quals),
4824 Initializer->getValueKind());
4825 if (RefConv & Sema::ReferenceConversions::DerivedToBase)
4826 Sequence.AddDerivedToBaseCastStep(cv1T1, VK_LValue);
4827 else
4828 Sequence.AddObjCObjectConversionStep(cv1T1);
4829 } else if (RefConv & Sema::ReferenceConversions::Qualification) {
4830 // Perform a (possibly multi-level) qualification conversion.
4831 Sequence.AddQualificationConversionStep(cv1T1,
4832 Initializer->getValueKind());
4833 } else if (RefConv & Sema::ReferenceConversions::Function) {
4834 Sequence.AddFunctionReferenceConversionStep(cv1T1);
4835 }
4836
4837 // We only create a temporary here when binding a reference to a
4838 // bit-field or vector element. Those cases are't supposed to be
4839 // handled by this bullet, but the outcome is the same either way.
4840 Sequence.AddReferenceBindingStep(cv1T1, false);
4841 return;
4842 }
4843
4844 // - has a class type (i.e., T2 is a class type), where T1 is not
4845 // reference-related to T2, and can be implicitly converted to an
4846 // lvalue of type "cv3 T3," where "cv1 T1" is reference-compatible
4847 // with "cv3 T3" (this conversion is selected by enumerating the
4848 // applicable conversion functions (13.3.1.6) and choosing the best
4849 // one through overload resolution (13.3)),
4850 // If we have an rvalue ref to function type here, the rhs must be
4851 // an rvalue. DR1287 removed the "implicitly" here.
4852 if (RefRelationship == Sema::Ref_Incompatible && T2->isRecordType() &&
4853 (isLValueRef || InitCategory.isRValue())) {
4854 if (S.getLangOpts().CPlusPlus) {
4855 // Try conversion functions only for C++.
4856 ConvOvlResult = TryRefInitWithConversionFunction(
4857 S, Entity, Kind, Initializer, /*AllowRValues*/ isRValueRef,
4858 /*IsLValueRef*/ isLValueRef, Sequence);
4859 if (ConvOvlResult == OR_Success)
4860 return;
4861 if (ConvOvlResult != OR_No_Viable_Function)
4862 Sequence.SetOverloadFailure(
4863 InitializationSequence::FK_ReferenceInitOverloadFailed,
4864 ConvOvlResult);
4865 } else {
4866 ConvOvlResult = OR_No_Viable_Function;
4867 }
4868 }
4869 }
4870
4871 // - Otherwise, the reference shall be an lvalue reference to a
4872 // non-volatile const type (i.e., cv1 shall be const), or the reference
4873 // shall be an rvalue reference.
4874 // For address spaces, we interpret this to mean that an addr space
4875 // of a reference "cv1 T1" is a superset of addr space of "cv2 T2".
4876 if (isLValueRef && !(T1Quals.hasConst() && !T1Quals.hasVolatile() &&
4877 T1Quals.isAddressSpaceSupersetOf(T2Quals))) {
4878 if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy)
4879 Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
4880 else if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty())
4881 Sequence.SetOverloadFailure(
4882 InitializationSequence::FK_ReferenceInitOverloadFailed,
4883 ConvOvlResult);
4884 else if (!InitCategory.isLValue())
4885 Sequence.SetFailed(
4886 T1Quals.isAddressSpaceSupersetOf(T2Quals)
4887 ? InitializationSequence::
4888 FK_NonConstLValueReferenceBindingToTemporary
4889 : InitializationSequence::FK_ReferenceInitDropsQualifiers);
4890 else {
4891 InitializationSequence::FailureKind FK;
4892 switch (RefRelationship) {
4893 case Sema::Ref_Compatible:
4894 if (Initializer->refersToBitField())
4895 FK = InitializationSequence::
4896 FK_NonConstLValueReferenceBindingToBitfield;
4897 else if (Initializer->refersToVectorElement())
4898 FK = InitializationSequence::
4899 FK_NonConstLValueReferenceBindingToVectorElement;
4900 else if (Initializer->refersToMatrixElement())
4901 FK = InitializationSequence::
4902 FK_NonConstLValueReferenceBindingToMatrixElement;
4903 else
4904 llvm_unreachable("unexpected kind of compatible initializer")__builtin_unreachable();
4905 break;
4906 case Sema::Ref_Related:
4907 FK = InitializationSequence::FK_ReferenceInitDropsQualifiers;
4908 break;
4909 case Sema::Ref_Incompatible:
4910 FK = InitializationSequence::
4911 FK_NonConstLValueReferenceBindingToUnrelated;
4912 break;
4913 }
4914 Sequence.SetFailed(FK);
4915 }
4916 return;
4917 }
4918
4919 // - If the initializer expression
4920 // - is an
4921 // [<=14] xvalue (but not a bit-field), class prvalue, array prvalue, or
4922 // [1z] rvalue (but not a bit-field) or
4923 // function lvalue and "cv1 T1" is reference-compatible with "cv2 T2"
4924 //
4925 // Note: functions are handled above and below rather than here...
4926 if (!T1Function &&
4927 (RefRelationship == Sema::Ref_Compatible ||
4928 (Kind.isCStyleOrFunctionalCast() &&
4929 RefRelationship == Sema::Ref_Related)) &&
4930 ((InitCategory.isXValue() && !isNonReferenceableGLValue(Initializer)) ||
4931 (InitCategory.isPRValue() &&
4932 (S.getLangOpts().CPlusPlus17 || T2->isRecordType() ||
4933 T2->isArrayType())))) {
4934 ExprValueKind ValueKind = InitCategory.isXValue() ? VK_XValue : VK_PRValue;
4935 if (InitCategory.isPRValue() && T2->isRecordType()) {
4936 // The corresponding bullet in C++03 [dcl.init.ref]p5 gives the
4937 // compiler the freedom to perform a copy here or bind to the
4938 // object, while C++0x requires that we bind directly to the
4939 // object. Hence, we always bind to the object without making an
4940 // extra copy. However, in C++03 requires that we check for the
4941 // presence of a suitable copy constructor:
4942 //
4943 // The constructor that would be used to make the copy shall
4944 // be callable whether or not the copy is actually done.
4945 if (!S.getLangOpts().CPlusPlus11 && !S.getLangOpts().MicrosoftExt)
4946 Sequence.AddExtraneousCopyToTemporary(cv2T2);
4947 else if (S.getLangOpts().CPlusPlus11)
4948 CheckCXX98CompatAccessibleCopy(S, Entity, Initializer);
4949 }
4950
4951 // C++1z [dcl.init.ref]/5.2.1.2:
4952 // If the converted initializer is a prvalue, its type T4 is adjusted
4953 // to type "cv1 T4" and the temporary materialization conversion is
4954 // applied.
4955 // Postpone address space conversions to after the temporary materialization
4956 // conversion to allow creating temporaries in the alloca address space.
4957 auto T1QualsIgnoreAS = T1Quals;
4958 auto T2QualsIgnoreAS = T2Quals;
4959 if (T1Quals.getAddressSpace() != T2Quals.getAddressSpace()) {
4960 T1QualsIgnoreAS.removeAddressSpace();
4961 T2QualsIgnoreAS.removeAddressSpace();
4962 }
4963 QualType cv1T4 = S.Context.getQualifiedType(cv2T2, T1QualsIgnoreAS);
4964 if (T1QualsIgnoreAS != T2QualsIgnoreAS)
4965 Sequence.AddQualificationConversionStep(cv1T4, ValueKind);
4966 Sequence.AddReferenceBindingStep(cv1T4, ValueKind == VK_PRValue);
4967 ValueKind = isLValueRef ? VK_LValue : VK_XValue;
4968 // Add addr space conversion if required.
4969 if (T1Quals.getAddressSpace() != T2Quals.getAddressSpace()) {
4970 auto T4Quals = cv1T4.getQualifiers();
4971 T4Quals.addAddressSpace(T1Quals.getAddressSpace());
4972 QualType cv1T4WithAS = S.Context.getQualifiedType(T2, T4Quals);
4973 Sequence.AddQualificationConversionStep(cv1T4WithAS, ValueKind);
4974 cv1T4 = cv1T4WithAS;
4975 }
4976
4977 // In any case, the reference is bound to the resulting glvalue (or to
4978 // an appropriate base class subobject).
4979 if (RefConv & Sema::ReferenceConversions::DerivedToBase)
4980 Sequence.AddDerivedToBaseCastStep(cv1T1, ValueKind);
4981 else if (RefConv & Sema::ReferenceConversions::ObjC)
4982 Sequence.AddObjCObjectConversionStep(cv1T1);
4983 else if (RefConv & Sema::ReferenceConversions::Qualification) {
4984 if (!S.Context.hasSameType(cv1T4, cv1T1))
4985 Sequence.AddQualificationConversionStep(cv1T1, ValueKind);
4986 }
4987 return;
4988 }
4989
4990 // - has a class type (i.e., T2 is a class type), where T1 is not
4991 // reference-related to T2, and can be implicitly converted to an
4992 // xvalue, class prvalue, or function lvalue of type "cv3 T3",
4993 // where "cv1 T1" is reference-compatible with "cv3 T3",
4994 //
4995 // DR1287 removes the "implicitly" here.
4996 if (T2->isRecordType()) {
4997 if (RefRelationship == Sema::Ref_Incompatible) {
4998 ConvOvlResult = TryRefInitWithConversionFunction(
4999 S, Entity, Kind, Initializer, /*AllowRValues*/ true,
5000 /*IsLValueRef*/ isLValueRef, Sequence);
5001 if (ConvOvlResult)
5002 Sequence.SetOverloadFailure(
5003 InitializationSequence::FK_ReferenceInitOverloadFailed,
5004 ConvOvlResult);
5005
5006 return;
5007 }
5008
5009 if (RefRelationship == Sema::Ref_Compatible &&
5010 isRValueRef && InitCategory.isLValue()) {
5011 Sequence.SetFailed(
5012 InitializationSequence::FK_RValueReferenceBindingToLValue);
5013 return;
5014 }
5015
5016 Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
5017 return;
5018 }
5019
5020 // - Otherwise, a temporary of type "cv1 T1" is created and initialized
5021 // from the initializer expression using the rules for a non-reference
5022 // copy-initialization (8.5). The reference is then bound to the
5023 // temporary. [...]
5024
5025 // Ignore address space of reference type at this point and perform address
5026 // space conversion after the reference binding step.
5027 QualType cv1T1IgnoreAS =
5028 T1Quals.hasAddressSpace()
5029 ? S.Context.getQualifiedType(T1, T1Quals.withoutAddressSpace())
5030 : cv1T1;
5031
5032 InitializedEntity TempEntity =
5033 InitializedEntity::InitializeTemporary(cv1T1IgnoreAS);
5034
5035 // FIXME: Why do we use an implicit conversion here rather than trying
5036 // copy-initialization?
5037 ImplicitConversionSequence ICS
5038 = S.TryImplicitConversion(Initializer, TempEntity.getType(),
5039 /*SuppressUserConversions=*/false,
5040 Sema::AllowedExplicit::None,
5041 /*FIXME:InOverloadResolution=*/false,
5042 /*CStyle=*/Kind.isCStyleOrFunctionalCast(),
5043 /*AllowObjCWritebackConversion=*/false);
5044
5045 if (ICS.isBad()) {
5046 // FIXME: Use the conversion function set stored in ICS to turn
5047 // this into an overloading ambiguity diagnostic. However, we need
5048 // to keep that set as an OverloadCandidateSet rather than as some
5049 // other kind of set.
5050 if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty())
5051 Sequence.SetOverloadFailure(
5052 InitializationSequence::FK_ReferenceInitOverloadFailed,
5053 ConvOvlResult);
5054 else if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy)
5055 Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
5056 else
5057 Sequence.SetFailed(InitializationSequence::FK_ReferenceInitFailed);
5058 return;
5059 } else {
5060 Sequence.AddConversionSequenceStep(ICS, TempEntity.getType());
5061 }
5062
5063 // [...] If T1 is reference-related to T2, cv1 must be the
5064 // same cv-qualification as, or greater cv-qualification
5065 // than, cv2; otherwise, the program is ill-formed.
5066 unsigned T1CVRQuals = T1Quals.getCVRQualifiers();
5067 unsigned T2CVRQuals = T2Quals.getCVRQualifiers();
5068 if (RefRelationship == Sema::Ref_Related &&
5069 ((T1CVRQuals | T2CVRQuals) != T1CVRQuals ||
5070 !T1Quals.isAddressSpaceSupersetOf(T2Quals))) {
5071 Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
5072 return;
5073 }
5074
5075 // [...] If T1 is reference-related to T2 and the reference is an rvalue
5076 // reference, the initializer expression shall not be an lvalue.
5077 if (RefRelationship >= Sema::Ref_Related && !isLValueRef &&
5078 InitCategory.isLValue()) {
5079 Sequence.SetFailed(
5080 InitializationSequence::FK_RValueReferenceBindingToLValue);
5081 return;
5082 }
5083
5084 Sequence.AddReferenceBindingStep(cv1T1IgnoreAS, /*BindingTemporary=*/true);
5085
5086 if (T1Quals.hasAddressSpace()) {
5087 if (!Qualifiers::isAddressSpaceSupersetOf(T1Quals.getAddressSpace(),
5088 LangAS::Default)) {
5089 Sequence.SetFailed(
5090 InitializationSequence::FK_ReferenceAddrspaceMismatchTemporary);
5091 return;
5092 }
5093 Sequence.AddQualificationConversionStep(cv1T1, isLValueRef ? VK_LValue
5094 : VK_XValue);
5095 }
5096}
5097
5098/// Attempt character array initialization from a string literal
5099/// (C++ [dcl.init.string], C99 6.7.8).
5100static void TryStringLiteralInitialization(Sema &S,
5101 const InitializedEntity &Entity,
5102 const InitializationKind &Kind,
5103 Expr *Initializer,
5104 InitializationSequence &Sequence) {
5105 Sequence.AddStringInitStep(Entity.getType());
5106}
5107
5108/// Attempt value initialization (C++ [dcl.init]p7).
5109static void TryValueInitialization(Sema &S,
5110 const InitializedEntity &Entity,
5111 const InitializationKind &Kind,
5112 InitializationSequence &Sequence,
5113 InitListExpr *InitList) {
5114 assert((!InitList || InitList->getNumInits() == 0) &&((void)0)
5115 "Shouldn't use value-init for non-empty init lists")((void)0);
5116
5117 // C++98 [dcl.init]p5, C++11 [dcl.init]p7:
5118 //
5119 // To value-initialize an object of type T means:
5120 QualType T = Entity.getType();
5121
5122 // -- if T is an array type, then each element is value-initialized;
5123 T = S.Context.getBaseElementType(T);
5124
5125 if (const RecordType *RT = T->getAs<RecordType>()) {
5126 if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
5127 bool NeedZeroInitialization = true;
5128 // C++98:
5129 // -- if T is a class type (clause 9) with a user-declared constructor
5130 // (12.1), then the default constructor for T is called (and the
5131 // initialization is ill-formed if T has no accessible default
5132 // constructor);
5133 // C++11:
5134 // -- if T is a class type (clause 9) with either no default constructor
5135 // (12.1 [class.ctor]) or a default constructor that is user-provided
5136 // or deleted, then the object is default-initialized;
5137 //
5138 // Note that the C++11 rule is the same as the C++98 rule if there are no
5139 // defaulted or deleted constructors, so we just use it unconditionally.
5140 CXXConstructorDecl *CD = S.LookupDefaultConstructor(ClassDecl);
5141 if (!CD || !CD->getCanonicalDecl()->isDefaulted() || CD->isDeleted())
5142 NeedZeroInitialization = false;
5143
5144 // -- if T is a (possibly cv-qualified) non-union class type without a
5145 // user-provided or deleted default constructor, then the object is
5146 // zero-initialized and, if T has a non-trivial default constructor,
5147 // default-initialized;
5148 // The 'non-union' here was removed by DR1502. The 'non-trivial default
5149 // constructor' part was removed by DR1507.
5150 if (NeedZeroInitialization)
5151 Sequence.AddZeroInitializationStep(Entity.getType());
5152
5153 // C++03:
5154 // -- if T is a non-union class type without a user-declared constructor,
5155 // then every non-static data member and base class component of T is
5156 // value-initialized;
5157 // [...] A program that calls for [...] value-initialization of an
5158 // entity of reference type is ill-formed.
5159 //
5160 // C++11 doesn't need this handling, because value-initialization does not
5161 // occur recursively there, and the implicit default constructor is
5162 // defined as deleted in the problematic cases.
5163 if (!S.getLangOpts().CPlusPlus11 &&
5164 ClassDecl->hasUninitializedReferenceMember()) {
5165 Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForReference);
5166 return;
5167 }
5168
5169 // If this is list-value-initialization, pass the empty init list on when
5170 // building the constructor call. This affects the semantics of a few
5171 // things (such as whether an explicit default constructor can be called).
5172 Expr *InitListAsExpr = InitList;
5173 MultiExprArg Args(&InitListAsExpr, InitList ? 1 : 0);
5174 bool InitListSyntax = InitList;
5175
5176 // FIXME: Instead of creating a CXXConstructExpr of array type here,
5177 // wrap a class-typed CXXConstructExpr in an ArrayInitLoopExpr.
5178 return TryConstructorInitialization(
5179 S, Entity, Kind, Args, T, Entity.getType(), Sequence, InitListSyntax);
5180 }
5181 }
5182
5183 Sequence.AddZeroInitializationStep(Entity.getType());
5184}
5185
5186/// Attempt default initialization (C++ [dcl.init]p6).
5187static void TryDefaultInitialization(Sema &S,
5188 const InitializedEntity &Entity,
5189 const InitializationKind &Kind,
5190 InitializationSequence &Sequence) {
5191 assert(Kind.getKind() == InitializationKind::IK_Default)((void)0);
5192
5193 // C++ [dcl.init]p6:
5194 // To default-initialize an object of type T means:
5195 // - if T is an array type, each element is default-initialized;
5196 QualType DestType = S.Context.getBaseElementType(Entity.getType());
5197
5198 // - if T is a (possibly cv-qualified) class type (Clause 9), the default
5199 // constructor for T is called (and the initialization is ill-formed if
5200 // T has no accessible default constructor);
5201 if (DestType->isRecordType() && S.getLangOpts().CPlusPlus) {
5202 TryConstructorInitialization(S, Entity, Kind, None, DestType,
5203 Entity.getType(), Sequence);
5204 return;
5205 }
5206
5207 // - otherwise, no initialization is performed.
5208
5209 // If a program calls for the default initialization of an object of
5210 // a const-qualified type T, T shall be a class type with a user-provided
5211 // default constructor.
5212 if (DestType.isConstQualified() && S.getLangOpts().CPlusPlus) {
5213 if (!maybeRecoverWithZeroInitialization(S, Sequence, Entity))
5214 Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst);
5215 return;
5216 }
5217
5218 // If the destination type has a lifetime property, zero-initialize it.
5219 if (DestType.getQualifiers().hasObjCLifetime()) {
5220 Sequence.AddZeroInitializationStep(Entity.getType());
5221 return;
5222 }
5223}
5224
5225/// Attempt a user-defined conversion between two types (C++ [dcl.init]),
5226/// which enumerates all conversion functions and performs overload resolution
5227/// to select the best.
5228static void TryUserDefinedConversion(Sema &S,
5229 QualType DestType,
5230 const InitializationKind &Kind,
5231 Expr *Initializer,
5232 InitializationSequence &Sequence,
5233 bool TopLevelOfInitList) {
5234 assert(!DestType->isReferenceType() && "References are handled elsewhere")((void)0);
5235 QualType SourceType = Initializer->getType();
5236 assert((DestType->isRecordType() || SourceType->isRecordType()) &&((void)0)
5237 "Must have a class type to perform a user-defined conversion")((void)0);
5238
5239 // Build the candidate set directly in the initialization sequence
5240 // structure, so that it will persist if we fail.
5241 OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
5242 CandidateSet.clear(OverloadCandidateSet::CSK_InitByUserDefinedConversion);
5243 CandidateSet.setDestAS(DestType.getQualifiers().getAddressSpace());
5244
5245 // Determine whether we are allowed to call explicit constructors or
5246 // explicit conversion operators.
5247 bool AllowExplicit = Kind.AllowExplicit();
5248
5249 if (const RecordType *DestRecordType = DestType->getAs<RecordType>()) {
5250 // The type we're converting to is a class type. Enumerate its constructors
5251 // to see if there is a suitable conversion.
5252 CXXRecordDecl *DestRecordDecl
5253 = cast<CXXRecordDecl>(DestRecordType->getDecl());
5254
5255 // Try to complete the type we're converting to.
5256 if (S.isCompleteType(Kind.getLocation(), DestType)) {
5257 for (NamedDecl *D : S.LookupConstructors(DestRecordDecl)) {
5258 auto Info = getConstructorInfo(D);
5259 if (!Info.Constructor)
5260 continue;
5261
5262 if (!Info.Constructor->isInvalidDecl() &&
5263 Info.Constructor->isConvertingConstructor(/*AllowExplicit*/true)) {
5264 if (Info.ConstructorTmpl)
5265 S.AddTemplateOverloadCandidate(
5266 Info.ConstructorTmpl, Info.FoundDecl,
5267 /*ExplicitArgs*/ nullptr, Initializer, CandidateSet,
5268 /*SuppressUserConversions=*/true,
5269 /*PartialOverloading*/ false, AllowExplicit);
5270 else
5271 S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl,
5272 Initializer, CandidateSet,
5273 /*SuppressUserConversions=*/true,
5274 /*PartialOverloading*/ false, AllowExplicit);
5275 }
5276 }
5277 }
5278 }
5279
5280 SourceLocation DeclLoc = Initializer->getBeginLoc();
5281
5282 if (const RecordType *SourceRecordType = SourceType->getAs<RecordType>()) {
5283 // The type we're converting from is a class type, enumerate its conversion
5284 // functions.
5285
5286 // We can only enumerate the conversion functions for a complete type; if
5287 // the type isn't complete, simply skip this step.
5288 if (S.isCompleteType(DeclLoc, SourceType)) {
5289 CXXRecordDecl *SourceRecordDecl
5290 = cast<CXXRecordDecl>(SourceRecordType->getDecl());
5291
5292 const auto &Conversions =
5293 SourceRecordDecl->getVisibleConversionFunctions();
5294 for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) {
5295 NamedDecl *D = *I;
5296 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
5297 if (isa<UsingShadowDecl>(D))
5298 D = cast<UsingShadowDecl>(D)->getTargetDecl();
5299
5300 FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
5301 CXXConversionDecl *Conv;
5302 if (ConvTemplate)
5303 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
5304 else
5305 Conv = cast<CXXConversionDecl>(D);
5306
5307 if (ConvTemplate)
5308 S.AddTemplateConversionCandidate(
5309 ConvTemplate, I.getPair(), ActingDC, Initializer, DestType,
5310 CandidateSet, AllowExplicit, AllowExplicit);
5311 else
5312 S.AddConversionCandidate(Conv, I.getPair(), ActingDC, Initializer,
5313 DestType, CandidateSet, AllowExplicit,
5314 AllowExplicit);
5315 }
5316 }
5317 }
5318
5319 // Perform overload resolution. If it fails, return the failed result.
5320 OverloadCandidateSet::iterator Best;
5321 if (OverloadingResult Result
5322 = CandidateSet.BestViableFunction(S, DeclLoc, Best)) {
5323 Sequence.SetOverloadFailure(
5324 InitializationSequence::FK_UserConversionOverloadFailed, Result);
5325
5326 // [class.copy.elision]p3:
5327 // In some copy-initialization contexts, a two-stage overload resolution
5328 // is performed.
5329 // If the first overload resolution selects a deleted function, we also
5330 // need the initialization sequence to decide whether to perform the second
5331 // overload resolution.
5332 if (!(Result == OR_Deleted &&
5333 Kind.getKind() == InitializationKind::IK_Copy))
5334 return;
5335 }
5336
5337 FunctionDecl *Function = Best->Function;
5338 Function->setReferenced();
5339 bool HadMultipleCandidates = (CandidateSet.size() > 1);
5340
5341 if (isa<CXXConstructorDecl>(Function)) {
5342 // Add the user-defined conversion step. Any cv-qualification conversion is
5343 // subsumed by the initialization. Per DR5, the created temporary is of the
5344 // cv-unqualified type of the destination.
5345 Sequence.AddUserConversionStep(Function, Best->FoundDecl,
5346 DestType.getUnqualifiedType(),
5347 HadMultipleCandidates);
5348
5349 // C++14 and before:
5350 // - if the function is a constructor, the call initializes a temporary
5351 // of the cv-unqualified version of the destination type. The [...]
5352 // temporary [...] is then used to direct-initialize, according to the
5353 // rules above, the object that is the destination of the
5354 // copy-initialization.
5355 // Note that this just performs a simple object copy from the temporary.
5356 //
5357 // C++17:
5358 // - if the function is a constructor, the call is a prvalue of the
5359 // cv-unqualified version of the destination type whose return object
5360 // is initialized by the constructor. The call is used to
5361 // direct-initialize, according to the rules above, the object that
5362 // is the destination of the copy-initialization.
5363 // Therefore we need to do nothing further.
5364 //
5365 // FIXME: Mark this copy as extraneous.
5366 if (!S.getLangOpts().CPlusPlus17)
5367 Sequence.AddFinalCopy(DestType);
5368 else if (DestType.hasQualifiers())
5369 Sequence.AddQualificationConversionStep(DestType, VK_PRValue);
5370 return;
5371 }
5372
5373 // Add the user-defined conversion step that calls the conversion function.
5374 QualType ConvType = Function->getCallResultType();
5375 Sequence.AddUserConversionStep(Function, Best->FoundDecl, ConvType,
5376 HadMultipleCandidates);
5377
5378 if (ConvType->getAs<RecordType>()) {
5379 // The call is used to direct-initialize [...] the object that is the
5380 // destination of the copy-initialization.
5381 //
5382 // In C++17, this does not call a constructor if we enter /17.6.1:
5383 // - If the initializer expression is a prvalue and the cv-unqualified
5384 // version of the source type is the same as the class of the
5385 // destination [... do not make an extra copy]
5386 //
5387 // FIXME: Mark this copy as extraneous.
5388 if (!S.getLangOpts().CPlusPlus17 ||
5389 Function->getReturnType()->isReferenceType() ||
5390 !S.Context.hasSameUnqualifiedType(ConvType, DestType))
5391 Sequence.AddFinalCopy(DestType);
5392 else if (!S.Context.hasSameType(ConvType, DestType))
5393 Sequence.AddQualificationConversionStep(DestType, VK_PRValue);
5394 return;
5395 }
5396
5397 // If the conversion following the call to the conversion function
5398 // is interesting, add it as a separate step.
5399 if (Best->FinalConversion.First || Best->FinalConversion.Second ||
5400 Best->FinalConversion.Third) {
5401 ImplicitConversionSequence ICS;
5402 ICS.setStandard();
5403 ICS.Standard = Best->FinalConversion;
5404 Sequence.AddConversionSequenceStep(ICS, DestType, TopLevelOfInitList);
5405 }
5406}
5407
5408/// An egregious hack for compatibility with libstdc++-4.2: in <tr1/hashtable>,
5409/// a function with a pointer return type contains a 'return false;' statement.
5410/// In C++11, 'false' is not a null pointer, so this breaks the build of any
5411/// code using that header.
5412///
5413/// Work around this by treating 'return false;' as zero-initializing the result
5414/// if it's used in a pointer-returning function in a system header.
5415static bool isLibstdcxxPointerReturnFalseHack(Sema &S,
5416 const InitializedEntity &Entity,
5417 const Expr *Init) {
5418 return S.getLangOpts().CPlusPlus11 &&
5419 Entity.getKind() == InitializedEntity::EK_Result &&
5420 Entity.getType()->isPointerType() &&
5421 isa<CXXBoolLiteralExpr>(Init) &&
5422 !cast<CXXBoolLiteralExpr>(Init)->getValue() &&
5423 S.getSourceManager().isInSystemHeader(Init->getExprLoc());
5424}
5425
5426/// The non-zero enum values here are indexes into diagnostic alternatives.
5427enum InvalidICRKind { IIK_okay, IIK_nonlocal, IIK_nonscalar };
5428
5429/// Determines whether this expression is an acceptable ICR source.
5430static InvalidICRKind isInvalidICRSource(ASTContext &C, Expr *e,
5431 bool isAddressOf, bool &isWeakAccess) {
5432 // Skip parens.
5433 e = e->IgnoreParens();
5434
5435 // Skip address-of nodes.
5436 if (UnaryOperator *op = dyn_cast<UnaryOperator>(e)) {
5437 if (op->getOpcode() == UO_AddrOf)
5438 return isInvalidICRSource(C, op->getSubExpr(), /*addressof*/ true,
5439 isWeakAccess);
5440
5441 // Skip certain casts.
5442 } else if (CastExpr *ce = dyn_cast<CastExpr>(e)) {
5443 switch (ce->getCastKind()) {
5444 case CK_Dependent:
5445 case CK_BitCast:
5446 case CK_LValueBitCast:
5447 case CK_NoOp:
5448 return isInvalidICRSource(C, ce->getSubExpr(), isAddressOf, isWeakAccess);
5449
5450 case CK_ArrayToPointerDecay:
5451 return IIK_nonscalar;
5452
5453 case CK_NullToPointer:
5454 return IIK_okay;
5455
5456 default:
5457 break;
5458 }
5459
5460 // If we have a declaration reference, it had better be a local variable.
5461 } else if (isa<DeclRefExpr>(e)) {
5462 // set isWeakAccess to true, to mean that there will be an implicit
5463 // load which requires a cleanup.
5464 if (e->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
5465 isWeakAccess = true;
5466
5467 if (!isAddressOf) return IIK_nonlocal;
5468
5469 VarDecl *var = dyn_cast<VarDecl>(cast<DeclRefExpr>(e)->getDecl());
5470 if (!var) return IIK_nonlocal;
5471
5472 return (var->hasLocalStorage() ? IIK_okay : IIK_nonlocal);
5473
5474 // If we have a conditional operator, check both sides.
5475 } else if (ConditionalOperator *cond = dyn_cast<ConditionalOperator>(e)) {
5476 if (InvalidICRKind iik = isInvalidICRSource(C, cond->getLHS(), isAddressOf,
5477 isWeakAccess))
5478 return iik;
5479
5480 return isInvalidICRSource(C, cond->getRHS(), isAddressOf, isWeakAccess);
5481
5482 // These are never scalar.
5483 } else if (isa<ArraySubscriptExpr>(e)) {
5484 return IIK_nonscalar;
5485
5486 // Otherwise, it needs to be a null pointer constant.
5487 } else {
5488 return (e->isNullPointerConstant(C, Expr::NPC_ValueDependentIsNull)
5489 ? IIK_okay : IIK_nonlocal);
5490 }
5491
5492 return IIK_nonlocal;
5493}
5494
5495/// Check whether the given expression is a valid operand for an
5496/// indirect copy/restore.
5497static void checkIndirectCopyRestoreSource(Sema &S, Expr *src) {
5498 assert(src->isPRValue())((void)0);
5499 bool isWeakAccess = false;
5500 InvalidICRKind iik = isInvalidICRSource(S.Context, src, false, isWeakAccess);
5501 // If isWeakAccess to true, there will be an implicit
5502 // load which requires a cleanup.
5503 if (S.getLangOpts().ObjCAutoRefCount && isWeakAccess)
5504 S.Cleanup.setExprNeedsCleanups(true);
5505
5506 if (iik == IIK_okay) return;
5507
5508 S.Diag(src->getExprLoc(), diag::err_arc_nonlocal_writeback)
5509 << ((unsigned) iik - 1) // shift index into diagnostic explanations
5510 << src->getSourceRange();
5511}
5512
5513/// Determine whether we have compatible array types for the
5514/// purposes of GNU by-copy array initialization.
5515static bool hasCompatibleArrayTypes(ASTContext &Context, const ArrayType *Dest,
5516 const ArrayType *Source) {
5517 // If the source and destination array types are equivalent, we're
5518 // done.
5519 if (Context.hasSameType(QualType(Dest, 0), QualType(Source, 0)))
5520 return true;
5521
5522 // Make sure that the element types are the same.
5523 if (!Context.hasSameType(Dest->getElementType(), Source->getElementType()))
5524 return false;
5525
5526 // The only mismatch we allow is when the destination is an
5527 // incomplete array type and the source is a constant array type.
5528 return Source->isConstantArrayType() && Dest->isIncompleteArrayType();
5529}
5530
5531static bool tryObjCWritebackConversion(Sema &S,
5532 InitializationSequence &Sequence,
5533 const InitializedEntity &Entity,
5534 Expr *Initializer) {
5535 bool ArrayDecay = false;
5536 QualType ArgType = Initializer->getType();
5537 QualType ArgPointee;
5538 if (const ArrayType *ArgArrayType = S.Context.getAsArrayType(ArgType)) {
5539 ArrayDecay = true;
5540 ArgPointee = ArgArrayType->getElementType();
5541 ArgType = S.Context.getPointerType(ArgPointee);
5542 }
5543
5544 // Handle write-back conversion.
5545 QualType ConvertedArgType;
5546 if (!S.isObjCWritebackConversion(ArgType, Entity.getType(),
5547 ConvertedArgType))
5548 return false;
5549
5550 // We should copy unless we're passing to an argument explicitly
5551 // marked 'out'.
5552 bool ShouldCopy = true;
5553 if (ParmVarDecl *param = cast_or_null<ParmVarDecl>(Entity.getDecl()))
5554 ShouldCopy = (param->getObjCDeclQualifier() != ParmVarDecl::OBJC_TQ_Out);
5555
5556 // Do we need an lvalue conversion?
5557 if (ArrayDecay || Initializer->isGLValue()) {
5558 ImplicitConversionSequence ICS;
5559 ICS.setStandard();
5560 ICS.Standard.setAsIdentityConversion();
5561
5562 QualType ResultType;
5563 if (ArrayDecay) {
5564 ICS.Standard.First = ICK_Array_To_Pointer;
5565 ResultType = S.Context.getPointerType(ArgPointee);
5566 } else {
5567 ICS.Standard.First = ICK_Lvalue_To_Rvalue;
5568 ResultType = Initializer->getType().getNonLValueExprType(S.Context);
5569 }
5570
5571 Sequence.AddConversionSequenceStep(ICS, ResultType);
5572 }
5573
5574 Sequence.AddPassByIndirectCopyRestoreStep(Entity.getType(), ShouldCopy);
5575 return true;
5576}
5577
5578static bool TryOCLSamplerInitialization(Sema &S,
5579 InitializationSequence &Sequence,
5580 QualType DestType,
5581 Expr *Initializer) {
5582 if (!S.getLangOpts().OpenCL || !DestType->isSamplerT() ||
24
←
Assuming field 'OpenCL' is not equal to 0
→
25
←
Calling 'Type::isSamplerT'
→
33
←
Returning from 'Type::isSamplerT'
→
5583 (!Initializer->isIntegerConstantExpr(S.Context) &&
34
←
Called C++ object pointer is null
5584 !Initializer->getType()->isSamplerT()))
5585 return false;
5586
5587 Sequence.AddOCLSamplerInitStep(DestType);
5588 return true;
5589}
5590
5591static bool IsZeroInitializer(Expr *Initializer, Sema &S) {
5592 return Initializer->isIntegerConstantExpr(S.getASTContext()) &&
5593 (Initializer->EvaluateKnownConstInt(S.getASTContext()) == 0);
5594}
5595
5596static bool TryOCLZeroOpaqueTypeInitialization(Sema &S,
5597 InitializationSequence &Sequence,
5598 QualType DestType,
5599 Expr *Initializer) {
5600 if (!S.getLangOpts().OpenCL)
5601 return false;
5602
5603 //
5604 // OpenCL 1.2 spec, s6.12.10
5605 //
5606 // The event argument can also be used to associate the
5607 // async_work_group_copy with a previous async copy allowing
5608 // an event to be shared by multiple async copies; otherwise
5609 // event should be zero.
5610 //
5611 if (DestType->isEventT() || DestType->isQueueT()) {
5612 if (!IsZeroInitializer(Initializer, S))
5613 return false;
5614
5615 Sequence.AddOCLZeroOpaqueTypeStep(DestType);
5616 return true;
5617 }
5618
5619 // We should allow zero initialization for all types defined in the
5620 // cl_intel_device_side_avc_motion_estimation extension, except
5621 // intel_sub_group_avc_mce_payload_t and intel_sub_group_avc_mce_result_t.
5622 if (S.getOpenCLOptions().isAvailableOption(
5623 "cl_intel_device_side_avc_motion_estimation", S.getLangOpts()) &&
5624 DestType->isOCLIntelSubgroupAVCType()) {
5625 if (DestType->isOCLIntelSubgroupAVCMcePayloadType() ||
5626 DestType->isOCLIntelSubgroupAVCMceResultType())
5627 return false;
5628 if (!IsZeroInitializer(Initializer, S))
5629 return false;
5630
5631 Sequence.AddOCLZeroOpaqueTypeStep(DestType);
5632 return true;
5633 }
5634
5635 return false;
5636}
5637
5638InitializationSequence::InitializationSequence(
5639 Sema &S, const InitializedEntity &Entity, const InitializationKind &Kind,
5640 MultiExprArg Args, bool TopLevelOfInitList, bool TreatUnavailableAsInvalid)
5641 : FailedOverloadResult(OR_Success),
5642 FailedCandidateSet(Kind.getLocation(), OverloadCandidateSet::CSK_Normal) {
5643 InitializeFrom(S, Entity, Kind, Args, TopLevelOfInitList,
5644 TreatUnavailableAsInvalid);
5645}
5646
5647/// Tries to get a FunctionDecl out of `E`. If it succeeds and we can take the
5648/// address of that function, this returns true. Otherwise, it returns false.
5649static bool isExprAnUnaddressableFunction(Sema &S, const Expr *E) {
5650 auto *DRE = dyn_cast<DeclRefExpr>(E);
5651 if (!DRE || !isa<FunctionDecl>(DRE->getDecl()))
5652 return false;
5653
5654 return !S.checkAddressOfFunctionIsAvailable(
5655 cast<FunctionDecl>(DRE->getDecl()));
5656}
5657
5658/// Determine whether we can perform an elementwise array copy for this kind
5659/// of entity.
5660static bool canPerformArrayCopy(const InitializedEntity &Entity) {
5661 switch (Entity.getKind()) {
5662 case InitializedEntity::EK_LambdaCapture:
5663 // C++ [expr.prim.lambda]p24:
5664 // For array members, the array elements are direct-initialized in
5665 // increasing subscript order.
5666 return true;
5667
5668 case InitializedEntity::EK_Variable:
5669 // C++ [dcl.decomp]p1:
5670 // [...] each element is copy-initialized or direct-initialized from the
5671 // corresponding element of the assignment-expression [...]
5672 return isa<DecompositionDecl>(Entity.getDecl());
5673
5674 case InitializedEntity::EK_Member:
5675 // C++ [class.copy.ctor]p14:
5676 // - if the member is an array, each element is direct-initialized with
5677 // the corresponding subobject of x
5678 return Entity.isImplicitMemberInitializer();
5679
5680 case InitializedEntity::EK_ArrayElement:
5681 // All the above cases are intended to apply recursively, even though none
5682 // of them actually say that.
5683 if (auto *E = Entity.getParent())
5684 return canPerformArrayCopy(*E);
5685 break;
5686
5687 default:
5688 break;
5689 }
5690
5691 return false;
5692}
5693
5694void InitializationSequence::InitializeFrom(Sema &S,
5695 const InitializedEntity &Entity,
5696 const InitializationKind &Kind,
5697 MultiExprArg Args,
5698 bool TopLevelOfInitList,
5699 bool TreatUnavailableAsInvalid) {
5700 ASTContext &Context = S.Context;
5701
5702 // Eliminate non-overload placeholder types in the arguments. We
5703 // need to do this before checking whether types are dependent
5704 // because lowering a pseudo-object expression might well give us
5705 // something of dependent type.
5706 for (unsigned I = 0, E = Args.size(); I != E; ++I)
1
Assuming 'I' is equal to 'E'
→
2
←
Loop condition is false. Execution continues on line 5723
→
5707 if (Args[I]->getType()->isNonOverloadPlaceholderType()) {
5708 // FIXME: should we be doing this here?
5709 ExprResult result = S.CheckPlaceholderExpr(Args[I]);
5710 if (result.isInvalid()) {
5711 SetFailed(FK_PlaceholderType);
5712 return;
5713 }
5714 Args[I] = result.get();
5715 }
5716
5717 // C++0x [dcl.init]p16:
5718 // The semantics of initializers are as follows. The destination type is
5719 // the type of the object or reference being initialized and the source
5720 // type is the type of the initializer expression. The source type is not
5721 // defined when the initializer is a braced-init-list or when it is a
5722 // parenthesized list of expressions.
5723 QualType DestType = Entity.getType();
5724
5725 if (DestType->isDependentType() ||
3
←
Assuming the condition is false
→
5
←
Taking false branch
→
5726 Expr::hasAnyTypeDependentArguments(Args)) {
4
←
Assuming the condition is false
→
5727 SequenceKind = DependentSequence;
5728 return;
5729 }
5730
5731 // Almost everything is a normal sequence.
5732 setSequenceKind(NormalSequence);
5733
5734 QualType SourceType;
5735 Expr *Initializer = nullptr;
6
←
'Initializer' initialized to a null pointer value
→
5736 if (Args.size() == 1) {
7
←
Assuming the condition is false
→
8
←
Taking false branch
→
5737 Initializer = Args[0];
5738 if (S.getLangOpts().ObjC) {
5739 if (S.CheckObjCBridgeRelatedConversions(Initializer->getBeginLoc(),
5740 DestType, Initializer->getType(),
5741 Initializer) ||
5742 S.CheckConversionToObjCLiteral(DestType, Initializer))
5743 Args[0] = Initializer;
5744 }
5745 if (!isa<InitListExpr>(Initializer))
5746 SourceType = Initializer->getType();
5747 }
5748
5749 // - If the initializer is a (non-parenthesized) braced-init-list, the
5750 // object is list-initialized (8.5.4).
5751 if (Kind.getKind() != InitializationKind::IK_Direct) {
9
←
Assuming the condition is false
→
10
←
Taking false branch
→
5752 if (InitListExpr *InitList = dyn_cast_or_null<InitListExpr>(Initializer)) {
5753 TryListInitialization(S, Entity, Kind, InitList, *this,
5754 TreatUnavailableAsInvalid);
5755 return;
5756 }
5757 }
5758
5759 // - If the destination type is a reference type, see 8.5.3.
5760 if (DestType->isReferenceType()) {
11
←
Calling 'Type::isReferenceType'
→
14
←
Returning from 'Type::isReferenceType'
→
15
←
Taking false branch
→
5761 // C++0x [dcl.init.ref]p1:
5762 // A variable declared to be a T& or T&&, that is, "reference to type T"
5763 // (8.3.2), shall be initialized by an object, or function, of type T or
5764 // by an object that can be converted into a T.
5765 // (Therefore, multiple arguments are not permitted.)
5766 if (Args.size() != 1)
5767 SetFailed(FK_TooManyInitsForReference);
5768 // C++17 [dcl.init.ref]p5:
5769 // A reference [...] is initialized by an expression [...] as follows:
5770 // If the initializer is not an expression, presumably we should reject,
5771 // but the standard fails to actually say so.
5772 else if (isa<InitListExpr>(Args[0]))
5773 SetFailed(FK_ParenthesizedListInitForReference);
5774 else
5775 TryReferenceInitialization(S, Entity, Kind, Args[0], *this);
5776 return;
5777 }
5778
5779 // - If the initializer is (), the object is value-initialized.
5780 if (Kind.getKind() == InitializationKind::IK_Value ||
17
←
Taking false branch
→
5781 (Kind.getKind() == InitializationKind::IK_Direct && Args.empty())) {
16
←
Assuming the condition is false
→
5782 TryValueInitialization(S, Entity, Kind, *this);
5783 return;
5784 }
5785
5786 // Handle default initialization.
5787 if (Kind.getKind() == InitializationKind::IK_Default) {
18
←
Taking false branch
→
5788 TryDefaultInitialization(S, Entity, Kind, *this);
5789 return;
5790 }
5791
5792 // - If the destination type is an array of characters, an array of
5793 // char16_t, an array of char32_t, or an array of wchar_t, and the
5794 // initializer is a string literal, see 8.5.2.
5795 // - Otherwise, if the destination type is an array, the program is
5796 // ill-formed.
5797 if (const ArrayType *DestAT = Context.getAsArrayType(DestType)) {
19
←
Assuming 'DestAT' is null
→
20
←
Taking false branch
→
5798 if (Initializer && isa<VariableArrayType>(DestAT)) {
5799 SetFailed(FK_VariableLengthArrayHasInitializer);
5800 return;
5801 }
5802
5803 if (Initializer) {
5804 switch (IsStringInit(Initializer, DestAT, Context)) {
5805 case SIF_None:
5806 TryStringLiteralInitialization(S, Entity, Kind, Initializer, *this);
5807 return;
5808 case SIF_NarrowStringIntoWideChar:
5809 SetFailed(FK_NarrowStringIntoWideCharArray);
5810 return;
5811 case SIF_WideStringIntoChar:
5812 SetFailed(FK_WideStringIntoCharArray);
5813 return;
5814 case SIF_IncompatWideStringIntoWideChar:
5815 SetFailed(FK_IncompatWideStringIntoWideChar);
5816 return;
5817 case SIF_PlainStringIntoUTF8Char:
5818 SetFailed(FK_PlainStringIntoUTF8Char);
5819 return;
5820 case SIF_UTF8StringIntoPlainChar:
5821 SetFailed(FK_UTF8StringIntoPlainChar);
5822 return;
5823 case SIF_Other:
5824 break;
5825 }
5826 }
5827
5828 // Some kinds of initialization permit an array to be initialized from
5829 // another array of the same type, and perform elementwise initialization.
5830 if (Initializer && isa<ConstantArrayType>(DestAT) &&
5831 S.Context.hasSameUnqualifiedType(Initializer->getType(),
5832 Entity.getType()) &&
5833 canPerformArrayCopy(Entity)) {
5834 // If source is a prvalue, use it directly.
5835 if (Initializer->isPRValue()) {
5836 AddArrayInitStep(DestType, /*IsGNUExtension*/false);
5837 return;
5838 }
5839
5840 // Emit element-at-a-time copy loop.
5841 InitializedEntity Element =
5842 InitializedEntity::InitializeElement(S.Context, 0, Entity);
5843 QualType InitEltT =
5844 Context.getAsArrayType(Initializer->getType())->getElementType();
5845 OpaqueValueExpr OVE(Initializer->getExprLoc(), InitEltT,
5846 Initializer->getValueKind(),
5847 Initializer->getObjectKind());
5848 Expr *OVEAsExpr = &OVE;
5849 InitializeFrom(S, Element, Kind, OVEAsExpr, TopLevelOfInitList,
5850 TreatUnavailableAsInvalid);
5851 if (!Failed())
5852 AddArrayInitLoopStep(Entity.getType(), InitEltT);
5853 return;
5854 }
5855
5856 // Note: as an GNU C extension, we allow initialization of an
5857 // array from a compound literal that creates an array of the same
5858 // type, so long as the initializer has no side effects.
5859 if (!S.getLangOpts().CPlusPlus && Initializer &&
5860 isa<CompoundLiteralExpr>(Initializer->IgnoreParens()) &&
5861 Initializer->getType()->isArrayType()) {
5862 const ArrayType *SourceAT
5863 = Context.getAsArrayType(Initializer->getType());
5864 if (!hasCompatibleArrayTypes(S.Context, DestAT, SourceAT))
5865 SetFailed(FK_ArrayTypeMismatch);
5866 else if (Initializer->HasSideEffects(S.Context))
5867 SetFailed(FK_NonConstantArrayInit);
5868 else {
5869 AddArrayInitStep(DestType, /*IsGNUExtension*/true);
5870 }
5871 }
5872 // Note: as a GNU C++ extension, we allow list-initialization of a
5873 // class member of array type from a parenthesized initializer list.
5874 else if (S.getLangOpts().CPlusPlus &&
5875 Entity.getKind() == InitializedEntity::EK_Member &&
5876 Initializer && isa<InitListExpr>(Initializer)) {
5877 TryListInitialization(S, Entity, Kind, cast<InitListExpr>(Initializer),
5878 *this, TreatUnavailableAsInvalid);
5879 AddParenthesizedArrayInitStep(DestType);
5880 } else if (DestAT->getElementType()->isCharType())
5881 SetFailed(FK_ArrayNeedsInitListOrStringLiteral);
5882 else if (IsWideCharCompatible(DestAT->getElementType(), Context))
5883 SetFailed(FK_ArrayNeedsInitListOrWideStringLiteral);
5884 else
5885 SetFailed(FK_ArrayNeedsInitList);
5886
5887 return;
5888 }
5889
5890 // Determine whether we should consider writeback conversions for
5891 // Objective-C ARC.
5892 bool allowObjCWritebackConversion = S.getLangOpts().ObjCAutoRefCount &&
21
←
Assuming field 'ObjCAutoRefCount' is 0
→
5893 Entity.isParameterKind();
5894
5895 if (TryOCLSamplerInitialization(S, *this, DestType, Initializer))
22
←
Passing null pointer value via 4th parameter 'Initializer'
→
23
←
Calling 'TryOCLSamplerInitialization'
→
5896 return;
5897
5898 // We're at the end of the line for C: it's either a write-back conversion
5899 // or it's a C assignment. There's no need to check anything else.
5900 if (!S.getLangOpts().CPlusPlus) {
5901 // If allowed, check whether this is an Objective-C writeback conversion.
5902 if (allowObjCWritebackConversion &&
5903 tryObjCWritebackConversion(S, *this, Entity, Initializer)) {
5904 return;
5905 }
5906
5907 if (TryOCLZeroOpaqueTypeInitialization(S, *this, DestType, Initializer))
5908 return;
5909
5910 // Handle initialization in C
5911 AddCAssignmentStep(DestType);
5912 MaybeProduceObjCObject(S, *this, Entity);
5913 return;
5914 }
5915
5916 assert(S.getLangOpts().CPlusPlus)((void)0);
5917
5918 // - If the destination type is a (possibly cv-qualified) class type:
5919 if (DestType->isRecordType()) {
5920 // - If the initialization is direct-initialization, or if it is
5921 // copy-initialization where the cv-unqualified version of the
5922 // source type is the same class as, or a derived class of, the
5923 // class of the destination, constructors are considered. [...]
5924 if (Kind.getKind() == InitializationKind::IK_Direct ||
5925 (Kind.getKind() == InitializationKind::IK_Copy &&
5926 (Context.hasSameUnqualifiedType(SourceType, DestType) ||
5927 S.IsDerivedFrom(Initializer->getBeginLoc(), SourceType, DestType))))
5928 TryConstructorInitialization(S, Entity, Kind, Args,
5929 DestType, DestType, *this);
5930 // - Otherwise (i.e., for the remaining copy-initialization cases),
5931 // user-defined conversion sequences that can convert from the source
5932 // type to the destination type or (when a conversion function is
5933 // used) to a derived class thereof are enumerated as described in
5934 // 13.3.1.4, and the best one is chosen through overload resolution
5935 // (13.3).
5936 else
5937 TryUserDefinedConversion(S, DestType, Kind, Initializer, *this,
5938 TopLevelOfInitList);
5939 return;
5940 }
5941
5942 assert(Args.size() >= 1 && "Zero-argument case handled above")((void)0);
5943
5944 // The remaining cases all need a source type.
5945 if (Args.size() > 1) {
5946 SetFailed(FK_TooManyInitsForScalar);
5947 return;
5948 } else if (isa<InitListExpr>(Args[0])) {
5949 SetFailed(FK_ParenthesizedListInitForScalar);
5950 return;
5951 }
5952
5953 // - Otherwise, if the source type is a (possibly cv-qualified) class
5954 // type, conversion functions are considered.
5955 if (!SourceType.isNull() && SourceType->isRecordType()) {
5956 // For a conversion to _Atomic(T) from either T or a class type derived
5957 // from T, initialize the T object then convert to _Atomic type.
5958 bool NeedAtomicConversion = false;
5959 if (const AtomicType *Atomic = DestType->getAs<AtomicType>()) {
5960 if (Context.hasSameUnqualifiedType(SourceType, Atomic->getValueType()) ||
5961 S.IsDerivedFrom(Initializer->getBeginLoc(), SourceType,
5962 Atomic->getValueType())) {
5963 DestType = Atomic->getValueType();
5964 NeedAtomicConversion = true;
5965 }
5966 }
5967
5968 TryUserDefinedConversion(S, DestType, Kind, Initializer, *this,
5969 TopLevelOfInitList);
5970 MaybeProduceObjCObject(S, *this, Entity);
5971 if (!Failed() && NeedAtomicConversion)
5972 AddAtomicConversionStep(Entity.getType());
5973 return;
5974 }
5975
5976 // - Otherwise, if the initialization is direct-initialization, the source
5977 // type is std::nullptr_t, and the destination type is bool, the initial
5978 // value of the object being initialized is false.
5979 if (!SourceType.isNull() && SourceType->isNullPtrType() &&
5980 DestType->isBooleanType() &&
5981 Kind.getKind() == InitializationKind::IK_Direct) {
5982 AddConversionSequenceStep(
5983 ImplicitConversionSequence::getNullptrToBool(SourceType, DestType,
5984 Initializer->isGLValue()),
5985 DestType);
5986 return;
5987 }
5988
5989 // - Otherwise, the initial value of the object being initialized is the
5990 // (possibly converted) value of the initializer expression. Standard
5991 // conversions (Clause 4) will be used, if necessary, to convert the
5992 // initializer expression to the cv-unqualified version of the
5993 // destination type; no user-defined conversions are considered.
5994
5995 ImplicitConversionSequence ICS
5996 = S.TryImplicitConversion(Initializer, DestType,
5997 /*SuppressUserConversions*/true,
5998 Sema::AllowedExplicit::None,
5999 /*InOverloadResolution*/ false,
6000 /*CStyle=*/Kind.isCStyleOrFunctionalCast(),
6001 allowObjCWritebackConversion);
6002
6003 if (ICS.isStandard() &&
6004 ICS.Standard.Second == ICK_Writeback_Conversion) {
6005 // Objective-C ARC writeback conversion.
6006
6007 // We should copy unless we're passing to an argument explicitly
6008 // marked 'out'.
6009 bool ShouldCopy = true;
6010 if (ParmVarDecl *Param = cast_or_null<ParmVarDecl>(Entity.getDecl()))
6011 ShouldCopy = (Param->getObjCDeclQualifier() != ParmVarDecl::OBJC_TQ_Out);
6012
6013 // If there was an lvalue adjustment, add it as a separate conversion.
6014 if (ICS.Standard.First == ICK_Array_To_Pointer ||
6015 ICS.Standard.First == ICK_Lvalue_To_Rvalue) {
6016 ImplicitConversionSequence LvalueICS;
6017 LvalueICS.setStandard();
6018 LvalueICS.Standard.setAsIdentityConversion();
6019 LvalueICS.Standard.setAllToTypes(ICS.Standard.getToType(0));
6020 LvalueICS.Standard.First = ICS.Standard.First;
6021 AddConversionSequenceStep(LvalueICS, ICS.Standard.getToType(0));
6022 }
6023
6024 AddPassByIndirectCopyRestoreStep(DestType, ShouldCopy);
6025 } else if (ICS.isBad()) {
6026 DeclAccessPair dap;
6027 if (isLibstdcxxPointerReturnFalseHack(S, Entity, Initializer)) {
6028 AddZeroInitializationStep(Entity.getType());
6029 } else if (Initializer->getType() == Context.OverloadTy &&
6030 !S.ResolveAddressOfOverloadedFunction(Initializer, DestType,
6031 false, dap))
6032 SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
6033 else if (Initializer->getType()->isFunctionType() &&
6034 isExprAnUnaddressableFunction(S, Initializer))
6035 SetFailed(InitializationSequence::FK_AddressOfUnaddressableFunction);
6036 else
6037 SetFailed(InitializationSequence::FK_ConversionFailed);
6038 } else {
6039 AddConversionSequenceStep(ICS, DestType, TopLevelOfInitList);
6040
6041 MaybeProduceObjCObject(S, *this, Entity);
6042 }
6043}
6044
6045InitializationSequence::~InitializationSequence() {
6046 for (auto &S : Steps)
6047 S.Destroy();
6048}
6049
6050//===----------------------------------------------------------------------===//
6051// Perform initialization
6052//===----------------------------------------------------------------------===//
6053static Sema::AssignmentAction
6054getAssignmentAction(const InitializedEntity &Entity, bool Diagnose = false) {
6055 switch(Entity.getKind()) {
6056 case InitializedEntity::EK_Variable:
6057 case InitializedEntity::EK_New:
6058 case InitializedEntity::EK_Exception:
6059 case InitializedEntity::EK_Base:
6060 case InitializedEntity::EK_Delegating:
6061 return Sema::AA_Initializing;
6062
6063 case InitializedEntity::EK_Parameter:
6064 if (Entity.getDecl() &&
6065 isa<ObjCMethodDecl>(Entity.getDecl()->getDeclContext()))
6066 return Sema::AA_Sending;
6067
6068 return Sema::AA_Passing;
6069
6070 case InitializedEntity::EK_Parameter_CF_Audited:
6071 if (Entity.getDecl() &&
6072 isa<ObjCMethodDecl>(Entity.getDecl()->getDeclContext()))
6073 return Sema::AA_Sending;
6074
6075 return !Diagnose ? Sema::AA_Passing : Sema::AA_Passing_CFAudited;
6076
6077 case InitializedEntity::EK_Result:
6078 case InitializedEntity::EK_StmtExprResult: // FIXME: Not quite right.
6079 return Sema::AA_Returning;
6080
6081 case InitializedEntity::EK_Temporary:
6082 case InitializedEntity::EK_RelatedResult:
6083 // FIXME: Can we tell apart casting vs. converting?
6084 return Sema::AA_Casting;
6085
6086 case InitializedEntity::EK_TemplateParameter:
6087 // This is really initialization, but refer to it as conversion for
6088 // consistency with CheckConvertedConstantExpression.
6089 return Sema::AA_Converting;
6090
6091 case InitializedEntity::EK_Member:
6092 case InitializedEntity::EK_Binding:
6093 case InitializedEntity::EK_ArrayElement:
6094 case InitializedEntity::EK_VectorElement:
6095 case InitializedEntity::EK_ComplexElement:
6096 case InitializedEntity::EK_BlockElement:
6097 case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
6098 case InitializedEntity::EK_LambdaCapture:
6099 case InitializedEntity::EK_CompoundLiteralInit:
6100 return Sema::AA_Initializing;
6101 }
6102
6103 llvm_unreachable("Invalid EntityKind!")__builtin_unreachable();
6104}
6105
6106/// Whether we should bind a created object as a temporary when
6107/// initializing the given entity.
6108static bool shouldBindAsTemporary(const InitializedEntity &Entity) {
6109 switch (Entity.getKind()) {
6110 case InitializedEntity::EK_ArrayElement:
6111 case InitializedEntity::EK_Member:
6112 case InitializedEntity::EK_Result:
6113 case InitializedEntity::EK_StmtExprResult:
6114 case InitializedEntity::EK_New:
6115 case InitializedEntity::EK_Variable:
6116 case InitializedEntity::EK_Base:
6117 case InitializedEntity::EK_Delegating:
6118 case InitializedEntity::EK_VectorElement:
6119 case InitializedEntity::EK_ComplexElement:
6120 case InitializedEntity::EK_Exception:
6121 case InitializedEntity::EK_BlockElement:
6122 case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
6123 case InitializedEntity::EK_LambdaCapture:
6124 case InitializedEntity::EK_CompoundLiteralInit:
6125 case InitializedEntity::EK_TemplateParameter:
6126 return false;
6127
6128 case InitializedEntity::EK_Parameter:
6129 case InitializedEntity::EK_Parameter_CF_Audited:
6130 case InitializedEntity::EK_Temporary:
6131 case InitializedEntity::EK_RelatedResult:
6132 case InitializedEntity::EK_Binding:
6133 return true;
6134 }
6135
6136 llvm_unreachable("missed an InitializedEntity kind?")__builtin_unreachable();
6137}
6138
6139/// Whether the given entity, when initialized with an object
6140/// created for that initialization, requires destruction.
6141static bool shouldDestroyEntity(const InitializedEntity &Entity) {
6142 switch (Entity.getKind()) {
6143 case InitializedEntity::EK_Result:
6144 case InitializedEntity::EK_StmtExprResult:
6145 case InitializedEntity::EK_New:
6146 case InitializedEntity::EK_Base:
6147 case InitializedEntity::EK_Delegating:
6148 case InitializedEntity::EK_VectorElement:
6149 case InitializedEntity::EK_ComplexElement:
6150 case InitializedEntity::EK_BlockElement:
6151 case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
6152 case InitializedEntity::EK_LambdaCapture:
6153 return false;
6154
6155 case InitializedEntity::EK_Member:
6156 case InitializedEntity::EK_Binding:
6157 case InitializedEntity::EK_Variable:
6158 case InitializedEntity::EK_Parameter:
6159 case InitializedEntity::EK_Parameter_CF_Audited:
6160 case InitializedEntity::EK_TemplateParameter:
6161 case InitializedEntity::EK_Temporary:
6162 case InitializedEntity::EK_ArrayElement:
6163 case InitializedEntity::EK_Exception:
6164 case InitializedEntity::EK_CompoundLiteralInit:
6165 case InitializedEntity::EK_RelatedResult:
6166 return true;
6167 }
6168
6169 llvm_unreachable("missed an InitializedEntity kind?")__builtin_unreachable();
6170}
6171
6172/// Get the location at which initialization diagnostics should appear.
6173static SourceLocation getInitializationLoc(const InitializedEntity &Entity,
6174 Expr *Initializer) {
6175 switch (Entity.getKind()) {
6176 case InitializedEntity::EK_Result:
6177 case InitializedEntity::EK_StmtExprResult:
6178 return Entity.getReturnLoc();
6179
6180 case InitializedEntity::EK_Exception:
6181 return Entity.getThrowLoc();
6182
6183 case InitializedEntity::EK_Variable:
6184 case InitializedEntity::EK_Binding:
6185 return Entity.getDecl()->getLocation();
6186
6187 case InitializedEntity::EK_LambdaCapture:
6188 return Entity.getCaptureLoc();
6189
6190 case InitializedEntity::EK_ArrayElement:
6191 case InitializedEntity::EK_Member:
6192 case InitializedEntity::EK_Parameter:
6193 case InitializedEntity::EK_Parameter_CF_Audited:
6194 case InitializedEntity::EK_TemplateParameter:
6195 case InitializedEntity::EK_Temporary:
6196 case InitializedEntity::EK_New:
6197 case InitializedEntity::EK_Base:
6198 case InitializedEntity::EK_Delegating:
6199 case InitializedEntity::EK_VectorElement:
6200 case InitializedEntity::EK_ComplexElement:
6201 case InitializedEntity::EK_BlockElement:
6202 case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
6203 case InitializedEntity::EK_CompoundLiteralInit:
6204 case InitializedEntity::EK_RelatedResult:
6205 return Initializer->getBeginLoc();
6206 }
6207 llvm_unreachable("missed an InitializedEntity kind?")__builtin_unreachable();
6208}
6209
6210/// Make a (potentially elidable) temporary copy of the object
6211/// provided by the given initializer by calling the appropriate copy
6212/// constructor.
6213///
6214/// \param S The Sema object used for type-checking.
6215///
6216/// \param T The type of the temporary object, which must either be
6217/// the type of the initializer expression or a superclass thereof.
6218///
6219/// \param Entity The entity being initialized.
6220///
6221/// \param CurInit The initializer expression.
6222///
6223/// \param IsExtraneousCopy Whether this is an "extraneous" copy that
6224/// is permitted in C++03 (but not C++0x) when binding a reference to
6225/// an rvalue.
6226///
6227/// \returns An expression that copies the initializer expression into
6228/// a temporary object, or an error expression if a copy could not be
6229/// created.
6230static ExprResult CopyObject(Sema &S,
6231 QualType T,
6232 const InitializedEntity &Entity,
6233 ExprResult CurInit,
6234 bool IsExtraneousCopy) {
6235 if (CurInit.isInvalid())
6236 return CurInit;
6237 // Determine which class type we're copying to.
6238 Expr *CurInitExpr = (Expr *)CurInit.get();
6239 CXXRecordDecl *Class = nullptr;
6240 if (const RecordType *Record = T->getAs<RecordType>())
6241 Class = cast<CXXRecordDecl>(Record->getDecl());
6242 if (!Class)
6243 return CurInit;
6244
6245 SourceLocation Loc = getInitializationLoc(Entity, CurInit.get());
6246
6247 // Make sure that the type we are copying is complete.
6248 if (S.RequireCompleteType(Loc, T, diag::err_temp_copy_incomplete))
6249 return CurInit;
6250
6251 // Perform overload resolution using the class's constructors. Per
6252 // C++11 [dcl.init]p16, second bullet for class types, this initialization
6253 // is direct-initialization.
6254 OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Normal);
6255 DeclContext::lookup_result Ctors = S.LookupConstructors(Class);
6256
6257 OverloadCandidateSet::iterator Best;
6258 switch (ResolveConstructorOverload(
6259 S, Loc, CurInitExpr, CandidateSet, T, Ctors, Best,
6260 /*CopyInitializing=*/false, /*AllowExplicit=*/true,
6261 /*OnlyListConstructors=*/false, /*IsListInit=*/false,
6262 /*SecondStepOfCopyInit=*/true)) {
6263 case OR_Success:
6264 break;
6265
6266 case OR_No_Viable_Function:
6267 CandidateSet.NoteCandidates(
6268 PartialDiagnosticAt(
6269 Loc, S.PDiag(IsExtraneousCopy && !S.isSFINAEContext()
6270 ? diag::ext_rvalue_to_reference_temp_copy_no_viable
6271 : diag::err_temp_copy_no_viable)
6272 << (int)Entity.getKind() << CurInitExpr->getType()
6273 << CurInitExpr->getSourceRange()),
6274 S, OCD_AllCandidates, CurInitExpr);
6275 if (!IsExtraneousCopy || S.isSFINAEContext())
6276 return ExprError();
6277 return CurInit;
6278
6279 case OR_Ambiguous:
6280 CandidateSet.NoteCandidates(
6281 PartialDiagnosticAt(Loc, S.PDiag(diag::err_temp_copy_ambiguous)
6282 << (int)Entity.getKind()
6283 << CurInitExpr->getType()
6284 << CurInitExpr->getSourceRange()),
6285 S, OCD_AmbiguousCandidates, CurInitExpr);
6286 return ExprError();
6287
6288 case OR_Deleted:
6289 S.Diag(Loc, diag::err_temp_copy_deleted)
6290 << (int)Entity.getKind() << CurInitExpr->getType()
6291 << CurInitExpr->getSourceRange();
6292 S.NoteDeletedFunction(Best->Function);
6293 return ExprError();
6294 }
6295
6296 bool HadMultipleCandidates = CandidateSet.size() > 1;
6297
6298 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function);
6299 SmallVector<Expr*, 8> ConstructorArgs;
6300 CurInit.get(); // Ownership transferred into MultiExprArg, below.
6301
6302 S.CheckConstructorAccess(Loc, Constructor, Best->FoundDecl, Entity,
6303 IsExtraneousCopy);
6304
6305 if (IsExtraneousCopy) {
6306 // If this is a totally extraneous copy for C++03 reference
6307 // binding purposes, just return the original initialization
6308 // expression. We don't generate an (elided) copy operation here
6309 // because doing so would require us to pass down a flag to avoid
6310 // infinite recursion, where each step adds another extraneous,
6311 // elidable copy.
6312
6313 // Instantiate the default arguments of any extra parameters in
6314 // the selected copy constructor, as if we were going to create a
6315 // proper call to the copy constructor.
6316 for (unsigned I = 1, N = Constructor->getNumParams(); I != N; ++I) {
6317 ParmVarDecl *Parm = Constructor->getParamDecl(I);
6318 if (S.RequireCompleteType(Loc, Parm->getType(),
6319 diag::err_call_incomplete_argument))
6320 break;
6321
6322 // Build the default argument expression; we don't actually care
6323 // if this succeeds or not, because this routine will complain
6324 // if there was a problem.
6325 S.BuildCXXDefaultArgExpr(Loc, Constructor, Parm);
6326 }
6327
6328 return CurInitExpr;
6329 }
6330
6331 // Determine the arguments required to actually perform the
6332 // constructor call (we might have derived-to-base conversions, or
6333 // the copy constructor may have default arguments).
6334 if (S.CompleteConstructorCall(Constructor, T, CurInitExpr, Loc,
6335 ConstructorArgs))
6336 return ExprError();
6337
6338 // C++0x [class.copy]p32:
6339 // When certain criteria are met, an implementation is allowed to
6340 // omit the copy/move construction of a class object, even if the
6341 // copy/move constructor and/or destructor for the object have
6342 // side effects. [...]
6343 // - when a temporary class object that has not been bound to a
6344 // reference (12.2) would be copied/moved to a class object
6345 // with the same cv-unqualified type, the copy/move operation
6346 // can be omitted by constructing the temporary object
6347 // directly into the target of the omitted copy/move
6348 //
6349 // Note that the other three bullets are handled elsewhere. Copy
6350 // elision for return statements and throw expressions are handled as part
6351 // of constructor initialization, while copy elision for exception handlers
6352 // is handled by the run-time.
6353 //
6354 // FIXME: If the function parameter is not the same type as the temporary, we
6355 // should still be able to elide the copy, but we don't have a way to
6356 // represent in the AST how much should be elided in this case.
6357 bool Elidable =
6358 CurInitExpr->isTemporaryObject(S.Context, Class) &&
6359 S.Context.hasSameUnqualifiedType(
6360 Best->Function->getParamDecl(0)->getType().getNonReferenceType(),
6361 CurInitExpr->getType());
6362
6363 // Actually perform the constructor call.
6364 CurInit = S.BuildCXXConstructExpr(Loc, T, Best->FoundDecl, Constructor,
6365 Elidable,
6366 ConstructorArgs,
6367 HadMultipleCandidates,
6368 /*ListInit*/ false,
6369 /*StdInitListInit*/ false,
6370 /*ZeroInit*/ false,
6371 CXXConstructExpr::CK_Complete,
6372 SourceRange());
6373
6374 // If we're supposed to bind temporaries, do so.
6375 if (!CurInit.isInvalid() && shouldBindAsTemporary(Entity))
6376 CurInit = S.MaybeBindToTemporary(CurInit.getAs<Expr>());
6377 return CurInit;
6378}
6379
6380/// Check whether elidable copy construction for binding a reference to
6381/// a temporary would have succeeded if we were building in C++98 mode, for
6382/// -Wc++98-compat.
6383static void CheckCXX98CompatAccessibleCopy(Sema &S,
6384 const InitializedEntity &Entity,
6385 Expr *CurInitExpr) {
6386 assert(S.getLangOpts().CPlusPlus11)((void)0);
6387
6388 const RecordType *Record = CurInitExpr->getType()->getAs<RecordType>();
6389 if (!Record)
6390 return;
6391
6392 SourceLocation Loc = getInitializationLoc(Entity, CurInitExpr);
6393 if (S.Diags.isIgnored(diag::warn_cxx98_compat_temp_copy, Loc))
6394 return;
6395
6396 // Find constructors which would have been considered.
6397 OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Normal);
6398 DeclContext::lookup_result Ctors =
6399 S.LookupConstructors(cast<CXXRecordDecl>(Record->getDecl()));
6400
6401 // Perform overload resolution.
6402 OverloadCandidateSet::iterator Best;
6403 OverloadingResult OR = ResolveConstructorOverload(
6404 S, Loc, CurInitExpr, CandidateSet, CurInitExpr->getType(), Ctors, Best,
6405 /*CopyInitializing=*/false, /*AllowExplicit=*/true,
6406 /*OnlyListConstructors=*/false, /*IsListInit=*/false,
6407 /*SecondStepOfCopyInit=*/true);
6408
6409 PartialDiagnostic Diag = S.PDiag(diag::warn_cxx98_compat_temp_copy)
6410 << OR << (int)Entity.getKind() << CurInitExpr->getType()
6411 << CurInitExpr->getSourceRange();
6412
6413 switch (OR) {
6414 case OR_Success:
6415 S.CheckConstructorAccess(Loc, cast<CXXConstructorDecl>(Best->Function),
6416 Best->FoundDecl, Entity, Diag);
6417 // FIXME: Check default arguments as far as that's possible.
6418 break;
6419
6420 case OR_No_Viable_Function:
6421 CandidateSet.NoteCandidates(PartialDiagnosticAt(Loc, Diag), S,
6422 OCD_AllCandidates, CurInitExpr);
6423 break;
6424
6425 case OR_Ambiguous:
6426 CandidateSet.NoteCandidates(PartialDiagnosticAt(Loc, Diag), S,
6427 OCD_AmbiguousCandidates, CurInitExpr);
6428 break;
6429
6430 case OR_Deleted:
6431 S.Diag(Loc, Diag);
6432 S.NoteDeletedFunction(Best->Function);
6433 break;
6434 }
6435}
6436
6437void InitializationSequence::PrintInitLocationNote(Sema &S,
6438 const InitializedEntity &Entity) {
6439 if (Entity.isParamOrTemplateParamKind() && Entity.getDecl()) {
6440 if (Entity.getDecl()->getLocation().isInvalid())
6441 return;
6442
6443 if (Entity.getDecl()->getDeclName())
6444 S.Diag(Entity.getDecl()->getLocation(), diag::note_parameter_named_here)
6445 << Entity.getDecl()->getDeclName();
6446 else
6447 S.Diag(Entity.getDecl()->getLocation(), diag::note_parameter_here);
6448 }
6449 else if (Entity.getKind() == InitializedEntity::EK_RelatedResult &&
6450 Entity.getMethodDecl())
6451 S.Diag(Entity.getMethodDecl()->getLocation(),
6452 diag::note_method_return_type_change)
6453 << Entity.getMethodDecl()->getDeclName();
6454}
6455
6456/// Returns true if the parameters describe a constructor initialization of
6457/// an explicit temporary object, e.g. "Point(x, y)".
6458static bool isExplicitTemporary(const InitializedEntity &Entity,
6459 const InitializationKind &Kind,
6460 unsigned NumArgs) {
6461 switch (Entity.getKind()) {
6462 case InitializedEntity::EK_Temporary:
6463 case InitializedEntity::EK_CompoundLiteralInit:
6464 case InitializedEntity::EK_RelatedResult:
6465 break;
6466 default:
6467 return false;
6468 }
6469
6470 switch (Kind.getKind()) {
6471 case InitializationKind::IK_DirectList:
6472 return true;
6473 // FIXME: Hack to work around cast weirdness.
6474 case InitializationKind::IK_Direct:
6475 case InitializationKind::IK_Value:
6476 return NumArgs != 1;
6477 default:
6478 return false;
6479 }
6480}
6481
6482static ExprResult
6483PerformConstructorInitialization(Sema &S,
6484 const InitializedEntity &Entity,
6485 const InitializationKind &Kind,
6486 MultiExprArg Args,
6487 const InitializationSequence::Step& Step,
6488 bool &ConstructorInitRequiresZeroInit,
6489 bool IsListInitialization,
6490 bool IsStdInitListInitialization,
6491 SourceLocation LBraceLoc,
6492 SourceLocation RBraceLoc) {
6493 unsigned NumArgs = Args.size();
6494 CXXConstructorDecl *Constructor
6495 = cast<CXXConstructorDecl>(Step.Function.Function);
6496 bool HadMultipleCandidates = Step.Function.HadMultipleCandidates;
6497
6498 // Build a call to the selected constructor.
6499 SmallVector<Expr*, 8> ConstructorArgs;
6500 SourceLocation Loc = (Kind.isCopyInit() && Kind.getEqualLoc().isValid())
6501 ? Kind.getEqualLoc()
6502 : Kind.getLocation();
6503
6504 if (Kind.getKind() == InitializationKind::IK_Default) {
6505 // Force even a trivial, implicit default constructor to be
6506 // semantically checked. We do this explicitly because we don't build
6507 // the definition for completely trivial constructors.
6508 assert(Constructor->getParent() && "No parent class for constructor.")((void)0);
6509 if (Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&
6510 Constructor->isTrivial() && !Constructor->isUsed(false)) {
6511 S.runWithSufficientStackSpace(Loc, [&] {
6512 S.DefineImplicitDefaultConstructor(Loc, Constructor);
6513 });
6514 }
6515 }
6516
6517 ExprResult CurInit((Expr *)nullptr);
6518
6519 // C++ [over.match.copy]p1:
6520 // - When initializing a temporary to be bound to the first parameter
6521 // of a constructor that takes a reference to possibly cv-qualified
6522 // T as its first argument, called with a single argument in the
6523 // context of direct-initialization, explicit conversion functions
6524 // are also considered.
6525 bool AllowExplicitConv =
6526 Kind.AllowExplicit() && !Kind.isCopyInit() && Args.size() == 1 &&
6527 hasCopyOrMoveCtorParam(S.Context,
6528 getConstructorInfo(Step.Function.FoundDecl));
6529
6530 // Determine the arguments required to actually perform the constructor
6531 // call.
6532 if (S.CompleteConstructorCall(Constructor, Step.Type, Args, Loc,
6533 ConstructorArgs, AllowExplicitConv,
6534 IsListInitialization))
6535 return ExprError();
6536
6537 if (isExplicitTemporary(Entity, Kind, NumArgs)) {
6538 // An explicitly-constructed temporary, e.g., X(1, 2).
6539 if (S.DiagnoseUseOfDecl(Constructor, Loc))
6540 return ExprError();
6541
6542 TypeSourceInfo *TSInfo = Entity.getTypeSourceInfo();
6543 if (!TSInfo)
6544 TSInfo = S.Context.getTrivialTypeSourceInfo(Entity.getType(), Loc);
6545 SourceRange ParenOrBraceRange =
6546 (Kind.getKind() == InitializationKind::IK_DirectList)
6547 ? SourceRange(LBraceLoc, RBraceLoc)
6548 : Kind.getParenOrBraceRange();
6549
6550 CXXConstructorDecl *CalleeDecl = Constructor;
6551 if (auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(
6552 Step.Function.FoundDecl.getDecl())) {
6553 CalleeDecl = S.findInheritingConstructor(Loc, Constructor, Shadow);
6554 if (S.DiagnoseUseOfDecl(CalleeDecl, Loc))
6555 return ExprError();
6556 }
6557 S.MarkFunctionReferenced(Loc, CalleeDecl);
6558
6559 CurInit = S.CheckForImmediateInvocation(
6560 CXXTemporaryObjectExpr::Create(
6561 S.Context, CalleeDecl,
6562 Entity.getType().getNonLValueExprType(S.Context), TSInfo,
6563 ConstructorArgs, ParenOrBraceRange, HadMultipleCandidates,
6564 IsListInitialization, IsStdInitListInitialization,
6565 ConstructorInitRequiresZeroInit),
6566 CalleeDecl);
6567 } else {
6568 CXXConstructExpr::ConstructionKind ConstructKind =
6569 CXXConstructExpr::CK_Complete;
6570
6571 if (Entity.getKind() == InitializedEntity::EK_Base) {
6572 ConstructKind = Entity.getBaseSpecifier()->isVirtual() ?
6573 CXXConstructExpr::CK_VirtualBase :
6574 CXXConstructExpr::CK_NonVirtualBase;
6575 } else if (Entity.getKind() == InitializedEntity::EK_Delegating) {
6576 ConstructKind = CXXConstructExpr::CK_Delegating;
6577 }
6578
6579 // Only get the parenthesis or brace range if it is a list initialization or
6580 // direct construction.
6581 SourceRange ParenOrBraceRange;
6582 if (IsListInitialization)
6583 ParenOrBraceRange = SourceRange(LBraceLoc, RBraceLoc);
6584 else if (Kind.getKind() == InitializationKind::IK_Direct)
6585 ParenOrBraceRange = Kind.getParenOrBraceRange();
6586
6587 // If the entity allows NRVO, mark the construction as elidable
6588 // unconditionally.
6589 if (Entity.allowsNRVO())
6590 CurInit = S.BuildCXXConstructExpr(Loc, Step.Type,
6591 Step.Function.FoundDecl,
6592 Constructor, /*Elidable=*/true,
6593 ConstructorArgs,
6594 HadMultipleCandidates,
6595 IsListInitialization,
6596 IsStdInitListInitialization,
6597 ConstructorInitRequiresZeroInit,
6598 ConstructKind,
6599 ParenOrBraceRange);
6600 else
6601 CurInit = S.BuildCXXConstructExpr(Loc, Step.Type,
6602 Step.Function.FoundDecl,
6603 Constructor,
6604 ConstructorArgs,
6605 HadMultipleCandidates,
6606 IsListInitialization,
6607 IsStdInitListInitialization,
6608 ConstructorInitRequiresZeroInit,
6609 ConstructKind,
6610 ParenOrBraceRange);
6611 }
6612 if (CurInit.isInvalid())
6613 return ExprError();
6614
6615 // Only check access if all of that succeeded.
6616 S.CheckConstructorAccess(Loc, Constructor, Step.Function.FoundDecl, Entity);
6617 if (S.DiagnoseUseOfDecl(Step.Function.FoundDecl, Loc))
6618 return ExprError();
6619
6620 if (const ArrayType *AT = S.Context.getAsArrayType(Entity.getType()))
6621 if (checkDestructorReference(S.Context.getBaseElementType(AT), Loc, S))
6622 return ExprError();
6623
6624 if (shouldBindAsTemporary(Entity))
6625 CurInit = S.MaybeBindToTemporary(CurInit.get());
6626
6627 return CurInit;
6628}
6629
6630namespace {
6631enum LifetimeKind {
6632 /// The lifetime of a temporary bound to this entity ends at the end of the
6633 /// full-expression, and that's (probably) fine.
6634 LK_FullExpression,
6635
6636 /// The lifetime of a temporary bound to this entity is extended to the
6637 /// lifeitme of the entity itself.
6638 LK_Extended,
6639
6640 /// The lifetime of a temporary bound to this entity probably ends too soon,
6641 /// because the entity is allocated in a new-expression.
6642 LK_New,
6643
6644 /// The lifetime of a temporary bound to this entity ends too soon, because
6645 /// the entity is a return object.
6646 LK_Return,
6647
6648 /// The lifetime of a temporary bound to this entity ends too soon, because
6649 /// the entity is the result of a statement expression.
6650 LK_StmtExprResult,
6651
6652 /// This is a mem-initializer: if it would extend a temporary (other than via
6653 /// a default member initializer), the program is ill-formed.
6654 LK_MemInitializer,
6655};
6656using LifetimeResult =
6657 llvm::PointerIntPair<const InitializedEntity *, 3, LifetimeKind>;
6658}
6659
6660/// Determine the declaration which an initialized entity ultimately refers to,
6661/// for the purpose of lifetime-extending a temporary bound to a reference in
6662/// the initialization of \p Entity.
6663static LifetimeResult getEntityLifetime(
6664 const InitializedEntity *Entity,
6665 const InitializedEntity *InitField = nullptr) {
6666 // C++11 [class.temporary]p5:
6667 switch (Entity->getKind()) {
6668 case InitializedEntity::EK_Variable:
6669 // The temporary [...] persists for the lifetime of the reference
6670 return {Entity, LK_Extended};
6671
6672 case InitializedEntity::EK_Member:
6673 // For subobjects, we look at the complete object.
6674 if (Entity->getParent())
6675 return getEntityLifetime(Entity->getParent(), Entity);
6676
6677 // except:
6678 // C++17 [class.base.init]p8:
6679 // A temporary expression bound to a reference member in a
6680 // mem-initializer is ill-formed.
6681 // C++17 [class.base.init]p11:
6682 // A temporary expression bound to a reference member from a
6683 // default member initializer is ill-formed.
6684 //
6685 // The context of p11 and its example suggest that it's only the use of a
6686 // default member initializer from a constructor that makes the program
6687 // ill-formed, not its mere existence, and that it can even be used by
6688 // aggregate initialization.
6689 return {Entity, Entity->isDefaultMemberInitializer() ? LK_Extended
6690 : LK_MemInitializer};
6691
6692 case InitializedEntity::EK_Binding:
6693 // Per [dcl.decomp]p3, the binding is treated as a variable of reference
6694 // type.
6695 return {Entity, LK_Extended};
6696
6697 case InitializedEntity::EK_Parameter:
6698 case InitializedEntity::EK_Parameter_CF_Audited:
6699 // -- A temporary bound to a reference parameter in a function call
6700 // persists until the completion of the full-expression containing
6701 // the call.
6702 return {nullptr, LK_FullExpression};
6703
6704 case InitializedEntity::EK_TemplateParameter:
6705 // FIXME: This will always be ill-formed; should we eagerly diagnose it here?
6706 return {nullptr, LK_FullExpression};
6707
6708 case InitializedEntity::EK_Result:
6709 // -- The lifetime of a temporary bound to the returned value in a
6710 // function return statement is not extended; the temporary is
6711 // destroyed at the end of the full-expression in the return statement.
6712 return {nullptr, LK_Return};
6713
6714 case InitializedEntity::EK_StmtExprResult:
6715 // FIXME: Should we lifetime-extend through the result of a statement
6716 // expression?
6717 return {nullptr, LK_StmtExprResult};
6718
6719 case InitializedEntity::EK_New:
6720 // -- A temporary bound to a reference in a new-initializer persists
6721 // until the completion of the full-expression containing the
6722 // new-initializer.
6723 return {nullptr, LK_New};
6724
6725 case InitializedEntity::EK_Temporary:
6726 case InitializedEntity::EK_CompoundLiteralInit:
6727 case InitializedEntity::EK_RelatedResult:
6728 // We don't yet know the storage duration of the surrounding temporary.
6729 // Assume it's got full-expression duration for now, it will patch up our
6730 // storage duration if that's not correct.
6731 return {nullptr, LK_FullExpression};
6732
6733 case InitializedEntity::EK_ArrayElement:
6734 // For subobjects, we look at the complete object.
6735 return getEntityLifetime(Entity->getParent(), InitField);
6736
6737 case InitializedEntity::EK_Base:
6738 // For subobjects, we look at the complete object.
6739 if (Entity->getParent())
6740 return getEntityLifetime(Entity->getParent(), InitField);
6741 return {InitField, LK_MemInitializer};
6742
6743 case InitializedEntity::EK_Delegating:
6744 // We can reach this case for aggregate initialization in a constructor:
6745 // struct A { int &&r; };
6746 // struct B : A { B() : A{0} {} };
6747 // In this case, use the outermost field decl as the context.
6748 return {InitField, LK_MemInitializer};
6749
6750 case InitializedEntity::EK_BlockElement:
6751 case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
6752 case InitializedEntity::EK_LambdaCapture:
6753 case InitializedEntity::EK_VectorElement:
6754 case InitializedEntity::EK_ComplexElement:
6755 return {nullptr, LK_FullExpression};
6756
6757 case InitializedEntity::EK_Exception:
6758 // FIXME: Can we diagnose lifetime problems with exceptions?
6759 return {nullptr, LK_FullExpression};
6760 }
6761 llvm_unreachable("unknown entity kind")__builtin_unreachable();
6762}
6763
6764namespace {
6765enum ReferenceKind {
6766 /// Lifetime would be extended by a reference binding to a temporary.
6767 RK_ReferenceBinding,
6768 /// Lifetime would be extended by a std::initializer_list object binding to
6769 /// its backing array.
6770 RK_StdInitializerList,
6771};
6772
6773/// A temporary or local variable. This will be one of:
6774/// * A MaterializeTemporaryExpr.
6775/// * A DeclRefExpr whose declaration is a local.
6776/// * An AddrLabelExpr.
6777/// * A BlockExpr for a block with captures.
6778using Local = Expr*;
6779
6780/// Expressions we stepped over when looking for the local state. Any steps
6781/// that would inhibit lifetime extension or take us out of subexpressions of
6782/// the initializer are included.
6783struct IndirectLocalPathEntry {
6784 enum EntryKind {
6785 DefaultInit,
6786 AddressOf,
6787 VarInit,
6788 LValToRVal,
6789 LifetimeBoundCall,
6790 TemporaryCopy,
6791 LambdaCaptureInit,
6792 GslReferenceInit,
6793 GslPointerInit
6794 } Kind;
6795 Expr *E;
6796 union {
6797 const Decl *D = nullptr;
6798 const LambdaCapture *Capture;
6799 };
6800 IndirectLocalPathEntry() {}
6801 IndirectLocalPathEntry(EntryKind K, Expr *E) : Kind(K), E(E) {}
6802 IndirectLocalPathEntry(EntryKind K, Expr *E, const Decl *D)
6803 : Kind(K), E(E), D(D) {}
6804 IndirectLocalPathEntry(EntryKind K, Expr *E, const LambdaCapture *Capture)
6805 : Kind(K), E(E), Capture(Capture) {}
6806};
6807
6808using IndirectLocalPath = llvm::SmallVectorImpl<IndirectLocalPathEntry>;
6809
6810struct RevertToOldSizeRAII {
6811 IndirectLocalPath &Path;
6812 unsigned OldSize = Path.size();
6813 RevertToOldSizeRAII(IndirectLocalPath &Path) : Path(Path) {}
6814 ~RevertToOldSizeRAII() { Path.resize(OldSize); }
6815};
6816
6817using LocalVisitor = llvm::function_ref<bool(IndirectLocalPath &Path, Local L,
6818 ReferenceKind RK)>;
6819}
6820
6821static bool isVarOnPath(IndirectLocalPath &Path, VarDecl *VD) {
6822 for (auto E : Path)
6823 if (E.Kind == IndirectLocalPathEntry::VarInit && E.D == VD)
6824 return true;
6825 return false;
6826}
6827
6828static bool pathContainsInit(IndirectLocalPath &Path) {
6829 return llvm::any_of(Path, [=](IndirectLocalPathEntry E) {
6830 return E.Kind == IndirectLocalPathEntry::DefaultInit ||
6831 E.Kind == IndirectLocalPathEntry::VarInit;
6832 });
6833}
6834
6835static void visitLocalsRetainedByInitializer(IndirectLocalPath &Path,
6836 Expr *Init, LocalVisitor Visit,
6837 bool RevisitSubinits,
6838 bool EnableLifetimeWarnings);
6839
6840static void visitLocalsRetainedByReferenceBinding(IndirectLocalPath &Path,
6841 Expr *Init, ReferenceKind RK,
6842 LocalVisitor Visit,
6843 bool EnableLifetimeWarnings);
6844
6845template <typename T> static bool isRecordWithAttr(QualType Type) {
6846 if (auto *RD = Type->getAsCXXRecordDecl())
6847 return RD->hasAttr<T>();
6848 return false;
6849}
6850
6851// Decl::isInStdNamespace will return false for iterators in some STL
6852// implementations due to them being defined in a namespace outside of the std
6853// namespace.
6854static bool isInStlNamespace(const Decl *D) {
6855 const DeclContext *DC = D->getDeclContext();
6856 if (!DC)
6857 return false;
6858 if (const auto *ND = dyn_cast<NamespaceDecl>(DC))
6859 if (const IdentifierInfo *II = ND->getIdentifier()) {
6860 StringRef Name = II->getName();
6861 if (Name.size() >= 2 && Name.front() == '_' &&
6862 (Name[1] == '_' || isUppercase(Name[1])))
6863 return true;
6864 }
6865
6866 return DC->isStdNamespace();
6867}
6868
6869static bool shouldTrackImplicitObjectArg(const CXXMethodDecl *Callee) {
6870 if (auto *Conv = dyn_cast_or_null<CXXConversionDecl>(Callee))
6871 if (isRecordWithAttr<PointerAttr>(Conv->getConversionType()))
6872 return true;
6873 if (!isInStlNamespace(Callee->getParent()))
6874 return false;
6875 if (!isRecordWithAttr<PointerAttr>(Callee->getThisObjectType()) &&
6876 !isRecordWithAttr<OwnerAttr>(Callee->getThisObjectType()))
6877 return false;
6878 if (Callee->getReturnType()->isPointerType() ||
6879 isRecordWithAttr<PointerAttr>(Callee->getReturnType())) {
6880 if (!Callee->getIdentifier())
6881 return false;
6882 return llvm::StringSwitch<bool>(Callee->getName())
6883 .Cases("begin", "rbegin", "cbegin", "crbegin", true)
6884 .Cases("end", "rend", "cend", "crend", true)
6885 .Cases("c_str", "data", "get", true)
6886 // Map and set types.
6887 .Cases("find", "equal_range", "lower_bound", "upper_bound", true)
6888 .Default(false);
6889 } else if (Callee->getReturnType()->isReferenceType()) {
6890 if (!Callee->getIdentifier()) {
6891 auto OO = Callee->getOverloadedOperator();
6892 return OO == OverloadedOperatorKind::OO_Subscript ||
6893 OO == OverloadedOperatorKind::OO_Star;
6894 }
6895 return llvm::StringSwitch<bool>(Callee->getName())
6896 .Cases("front", "back", "at", "top", "value", true)
6897 .Default(false);
6898 }
6899 return false;
6900}
6901
6902static bool shouldTrackFirstArgument(const FunctionDecl *FD) {
6903 if (!FD->getIdentifier() || FD->getNumParams() != 1)
6904 return false;
6905 const auto *RD = FD->getParamDecl(0)->getType()->getPointeeCXXRecordDecl();
6906 if (!FD->isInStdNamespace() || !RD || !RD->isInStdNamespace())
6907 return false;
6908 if (!isRecordWithAttr<PointerAttr>(QualType(RD->getTypeForDecl(), 0)) &&
6909 !isRecordWithAttr<OwnerAttr>(QualType(RD->getTypeForDecl(), 0)))
6910 return false;
6911 if (FD->getReturnType()->isPointerType() ||
6912 isRecordWithAttr<PointerAttr>(FD->getReturnType())) {
6913 return llvm::StringSwitch<bool>(FD->getName())
6914 .Cases("begin", "rbegin", "cbegin", "crbegin", true)
6915 .Cases("end", "rend", "cend", "crend", true)
6916 .Case("data", true)
6917 .Default(false);
6918 } else if (FD->getReturnType()->isReferenceType()) {
6919 return llvm::StringSwitch<bool>(FD->getName())
6920 .Cases("get", "any_cast", true)
6921 .Default(false);
6922 }
6923 return false;
6924}
6925
6926static void handleGslAnnotatedTypes(IndirectLocalPath &Path, Expr *Call,
6927 LocalVisitor Visit) {
6928 auto VisitPointerArg = [&](const Decl *D, Expr *Arg, bool Value) {
6929 // We are not interested in the temporary base objects of gsl Pointers:
6930 // Temp().ptr; // Here ptr might not dangle.
6931 if (isa<MemberExpr>(Arg->IgnoreImpCasts()))
6932 return;
6933 // Once we initialized a value with a reference, it can no longer dangle.
6934 if (!Value) {
6935 for (auto It = Path.rbegin(), End = Path.rend(); It != End; ++It) {
6936 if (It->Kind == IndirectLocalPathEntry::GslReferenceInit)
6937 continue;
6938 if (It->Kind == IndirectLocalPathEntry::GslPointerInit)
6939 return;
6940 break;
6941 }
6942 }
6943 Path.push_back({Value ? IndirectLocalPathEntry::GslPointerInit
6944 : IndirectLocalPathEntry::GslReferenceInit,
6945 Arg, D});
6946 if (Arg->isGLValue())
6947 visitLocalsRetainedByReferenceBinding(Path, Arg, RK_ReferenceBinding,
6948 Visit,
6949 /*EnableLifetimeWarnings=*/true);
6950 else
6951 visitLocalsRetainedByInitializer(Path, Arg, Visit, true,
6952 /*EnableLifetimeWarnings=*/true);
6953 Path.pop_back();
6954 };
6955
6956 if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Call)) {
6957 const auto *MD = cast_or_null<CXXMethodDecl>(MCE->getDirectCallee());
6958 if (MD && shouldTrackImplicitObjectArg(MD))
6959 VisitPointerArg(MD, MCE->getImplicitObjectArgument(),
6960 !MD->getReturnType()->isReferenceType());
6961 return;
6962 } else if (auto *OCE = dyn_cast<CXXOperatorCallExpr>(Call)) {
6963 FunctionDecl *Callee = OCE->getDirectCallee();
6964 if (Callee && Callee->isCXXInstanceMember() &&
6965 shouldTrackImplicitObjectArg(cast<CXXMethodDecl>(Callee)))
6966 VisitPointerArg(Callee, OCE->getArg(0),
6967 !Callee->getReturnType()->isReferenceType());
6968 return;
6969 } else if (auto *CE = dyn_cast<CallExpr>(Call)) {
6970 FunctionDecl *Callee = CE->getDirectCallee();
6971 if (Callee && shouldTrackFirstArgument(Callee))
6972 VisitPointerArg(Callee, CE->getArg(0),
6973 !Callee->getReturnType()->isReferenceType());
6974 return;
6975 }
6976
6977 if (auto *CCE = dyn_cast<CXXConstructExpr>(Call)) {
6978 const auto *Ctor = CCE->getConstructor();
6979 const CXXRecordDecl *RD = Ctor->getParent();
6980 if (CCE->getNumArgs() > 0 && RD->hasAttr<PointerAttr>())
6981 VisitPointerArg(Ctor->getParamDecl(0), CCE->getArgs()[0], true);
6982 }
6983}
6984
6985static bool implicitObjectParamIsLifetimeBound(const FunctionDecl *FD) {
6986 const TypeSourceInfo *TSI = FD->getTypeSourceInfo();
6987 if (!TSI)
6988 return false;
6989 // Don't declare this variable in the second operand of the for-statement;
6990 // GCC miscompiles that by ending its lifetime before evaluating the
6991 // third operand. See gcc.gnu.org/PR86769.
6992 AttributedTypeLoc ATL;
6993 for (TypeLoc TL = TSI->getTypeLoc();
6994 (ATL = TL.getAsAdjusted<AttributedTypeLoc>());
6995 TL = ATL.getModifiedLoc()) {
6996 if (ATL.getAttrAs<LifetimeBoundAttr>())
6997 return true;
6998 }
6999
7000 // Assume that all assignment operators with a "normal" return type return
7001 // *this, that is, an lvalue reference that is the same type as the implicit
7002 // object parameter (or the LHS for a non-member operator$=).
7003 OverloadedOperatorKind OO = FD->getDeclName().getCXXOverloadedOperator();
7004 if (OO == OO_Equal || isCompoundAssignmentOperator(OO)) {
7005 QualType RetT = FD->getReturnType();
7006 if (RetT->isLValueReferenceType()) {
7007 ASTContext &Ctx = FD->getASTContext();
7008 QualType LHST;
7009 auto *MD = dyn_cast<CXXMethodDecl>(FD);
7010 if (MD && MD->isCXXInstanceMember())
7011 LHST = Ctx.getLValueReferenceType(MD->getThisObjectType());
7012 else
7013 LHST = MD->getParamDecl(0)->getType();
7014 if (Ctx.hasSameType(RetT, LHST))
7015 return true;
7016 }
7017 }
7018
7019 return false;
7020}
7021
7022static void visitLifetimeBoundArguments(IndirectLocalPath &Path, Expr *Call,
7023 LocalVisitor Visit) {
7024 const FunctionDecl *Callee;
7025 ArrayRef<Expr*> Args;
7026
7027 if (auto *CE = dyn_cast<CallExpr>(Call)) {
7028 Callee = CE->getDirectCallee();
7029 Args = llvm::makeArrayRef(CE->getArgs(), CE->getNumArgs());
7030 } else {
7031 auto *CCE = cast<CXXConstructExpr>(Call);
7032 Callee = CCE->getConstructor();
7033 Args = llvm::makeArrayRef(CCE->getArgs(), CCE->getNumArgs());
7034 }
7035 if (!Callee)
7036 return;
7037
7038 Expr *ObjectArg = nullptr;
7039 if (isa<CXXOperatorCallExpr>(Call) && Callee->isCXXInstanceMember()) {
7040 ObjectArg = Args[0];
7041 Args = Args.slice(1);
7042 } else if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Call)) {
7043 ObjectArg = MCE->getImplicitObjectArgument();
7044 }
7045
7046 auto VisitLifetimeBoundArg = [&](const Decl *D, Expr *Arg) {
7047 Path.push_back({IndirectLocalPathEntry::LifetimeBoundCall, Arg, D});
7048 if (Arg->isGLValue())
7049 visitLocalsRetainedByReferenceBinding(Path, Arg, RK_ReferenceBinding,
7050 Visit,
7051 /*EnableLifetimeWarnings=*/false);
7052 else
7053 visitLocalsRetainedByInitializer(Path, Arg, Visit, true,
7054 /*EnableLifetimeWarnings=*/false);
7055 Path.pop_back();
7056 };
7057
7058 if (ObjectArg && implicitObjectParamIsLifetimeBound(Callee))
7059 VisitLifetimeBoundArg(Callee, ObjectArg);
7060
7061 for (unsigned I = 0,
7062 N = std::min<unsigned>(Callee->getNumParams(), Args.size());
7063 I != N; ++I) {
7064 if (Callee->getParamDecl(I)->hasAttr<LifetimeBoundAttr>())
7065 VisitLifetimeBoundArg(Callee->getParamDecl(I), Args[I]);
7066 }
7067}
7068
7069/// Visit the locals that would be reachable through a reference bound to the
7070/// glvalue expression \c Init.
7071static void visitLocalsRetainedByReferenceBinding(IndirectLocalPath &Path,
7072 Expr *Init, ReferenceKind RK,
7073 LocalVisitor Visit,
7074 bool EnableLifetimeWarnings) {
7075 RevertToOldSizeRAII RAII(Path);
7076
7077 // Walk past any constructs which we can lifetime-extend across.
7078 Expr *Old;
7079 do {
7080 Old = Init;
7081
7082 if (auto *FE = dyn_cast<FullExpr>(Init))
7083 Init = FE->getSubExpr();
7084
7085 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) {
7086 // If this is just redundant braces around an initializer, step over it.
7087 if (ILE->isTransparent())
7088 Init = ILE->getInit(0);
7089 }
7090
7091 // Step over any subobject adjustments; we may have a materialized
7092 // temporary inside them.
7093 Init = const_cast<Expr *>(Init->skipRValueSubobjectAdjustments());
7094
7095 // Per current approach for DR1376, look through casts to reference type
7096 // when performing lifetime extension.
7097 if (CastExpr *CE = dyn_cast<CastExpr>(Init))
7098 if (CE->getSubExpr()->isGLValue())
7099 Init = CE->getSubExpr();
7100
7101 // Per the current approach for DR1299, look through array element access
7102 // on array glvalues when performing lifetime extension.
7103 if (auto *ASE = dyn_cast<ArraySubscriptExpr>(Init)) {
7104 Init = ASE->getBase();
7105 auto *ICE = dyn_cast<ImplicitCastExpr>(Init);
7106 if (ICE && ICE->getCastKind() == CK_ArrayToPointerDecay)
7107 Init = ICE->getSubExpr();
7108 else
7109 // We can't lifetime extend through this but we might still find some
7110 // retained temporaries.
7111 return visitLocalsRetainedByInitializer(Path, Init, Visit, true,
7112 EnableLifetimeWarnings);
7113 }
7114
7115 // Step into CXXDefaultInitExprs so we can diagnose cases where a
7116 // constructor inherits one as an implicit mem-initializer.
7117 if (auto *DIE = dyn_cast<CXXDefaultInitExpr>(Init)) {
7118 Path.push_back(
7119 {IndirectLocalPathEntry::DefaultInit, DIE, DIE->getField()});
7120 Init = DIE->getExpr();
7121 }
7122 } while (Init != Old);
7123
7124 if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(Init)) {
7125 if (Visit(Path, Local(MTE), RK))
7126 visitLocalsRetainedByInitializer(Path, MTE->getSubExpr(), Visit, true,
7127 EnableLifetimeWarnings);
7128 }
7129
7130 if (isa<CallExpr>(Init)) {
7131 if (EnableLifetimeWarnings)
7132 handleGslAnnotatedTypes(Path, Init, Visit);
7133 return visitLifetimeBoundArguments(Path, Init, Visit);
7134 }
7135
7136 switch (Init->getStmtClass()) {
7137 case Stmt::DeclRefExprClass: {
7138 // If we find the name of a local non-reference parameter, we could have a
7139 // lifetime problem.
7140 auto *DRE = cast<DeclRefExpr>(Init);
7141 auto *VD = dyn_cast<VarDecl>(DRE->getDecl());
7142 if (VD && VD->hasLocalStorage() &&
7143 !DRE->refersToEnclosingVariableOrCapture()) {
7144 if (!VD->getType()->isReferenceType()) {
7145 Visit(Path, Local(DRE), RK);
7146 } else if (isa<ParmVarDecl>(DRE->getDecl())) {
7147 // The lifetime of a reference parameter is unknown; assume it's OK
7148 // for now.
7149 break;
7150 } else if (VD->getInit() && !isVarOnPath(Path, VD)) {
7151 Path.push_back({IndirectLocalPathEntry::VarInit, DRE, VD});
7152 visitLocalsRetainedByReferenceBinding(Path, VD->getInit(),
7153 RK_ReferenceBinding, Visit,
7154 EnableLifetimeWarnings);
7155 }
7156 }
7157 break;
7158 }
7159
7160 case Stmt::UnaryOperatorClass: {
7161 // The only unary operator that make sense to handle here
7162 // is Deref. All others don't resolve to a "name." This includes
7163 // handling all sorts of rvalues passed to a unary operator.
7164 const UnaryOperator *U = cast<UnaryOperator>(Init);
7165 if (U->getOpcode() == UO_Deref)
7166 visitLocalsRetainedByInitializer(Path, U->getSubExpr(), Visit, true,
7167 EnableLifetimeWarnings);
7168 break;
7169 }
7170
7171 case Stmt::OMPArraySectionExprClass: {
7172 visitLocalsRetainedByInitializer(Path,
7173 cast<OMPArraySectionExpr>(Init)->getBase(),
7174 Visit, true, EnableLifetimeWarnings);
7175 break;
7176 }
7177
7178 case Stmt::ConditionalOperatorClass:
7179 case Stmt::BinaryConditionalOperatorClass: {
7180 auto *C = cast<AbstractConditionalOperator>(Init);
7181 if (!C->getTrueExpr()->getType()->isVoidType())
7182 visitLocalsRetainedByReferenceBinding(Path, C->getTrueExpr(), RK, Visit,
7183 EnableLifetimeWarnings);
7184 if (!C->getFalseExpr()->getType()->isVoidType())
7185 visitLocalsRetainedByReferenceBinding(Path, C->getFalseExpr(), RK, Visit,
7186 EnableLifetimeWarnings);
7187 break;
7188 }
7189
7190 // FIXME: Visit the left-hand side of an -> or ->*.
7191
7192 default:
7193 break;
7194 }
7195}
7196
7197/// Visit the locals that would be reachable through an object initialized by
7198/// the prvalue expression \c Init.
7199static void visitLocalsRetainedByInitializer(IndirectLocalPath &Path,
7200 Expr *Init, LocalVisitor Visit,
7201 bool RevisitSubinits,
7202 bool EnableLifetimeWarnings) {
7203 RevertToOldSizeRAII RAII(Path);
7204
7205 Expr *Old;
7206 do {
7207 Old = Init;
7208
7209 // Step into CXXDefaultInitExprs so we can diagnose cases where a
7210 // constructor inherits one as an implicit mem-initializer.
7211 if (auto *DIE = dyn_cast<CXXDefaultInitExpr>(Init)) {
7212 Path.push_back({IndirectLocalPathEntry::DefaultInit, DIE, DIE->getField()});
7213 Init = DIE->getExpr();
7214 }
7215
7216 if (auto *FE = dyn_cast<FullExpr>(Init))
7217 Init = FE->getSubExpr();
7218
7219 // Dig out the expression which constructs the extended temporary.
7220 Init = const_cast<Expr *>(Init->skipRValueSubobjectAdjustments());
7221
7222 if (CXXBindTemporaryExpr *BTE = dyn_cast<CXXBindTemporaryExpr>(Init))
7223 Init = BTE->getSubExpr();
7224
7225 Init = Init->IgnoreParens();
7226
7227 // Step over value-preserving rvalue casts.
7228 if (auto *CE = dyn_cast<CastExpr>(Init)) {
7229 switch (CE->getCastKind()) {
7230 case CK_LValueToRValue:
7231 // If we can match the lvalue to a const object, we can look at its
7232 // initializer.
7233 Path.push_back({IndirectLocalPathEntry::LValToRVal, CE});
7234 return visitLocalsRetainedByReferenceBinding(
7235 Path, Init, RK_ReferenceBinding,
7236 [&](IndirectLocalPath &Path, Local L, ReferenceKind RK) -> bool {
7237 if (auto *DRE = dyn_cast<DeclRefExpr>(L)) {
7238 auto *VD = dyn_cast<VarDecl>(DRE->getDecl());
7239 if (VD && VD->getType().isConstQualified() && VD->getInit() &&
7240 !isVarOnPath(Path, VD)) {
7241 Path.push_back({IndirectLocalPathEntry::VarInit, DRE, VD});
7242 visitLocalsRetainedByInitializer(Path, VD->getInit(), Visit, true,
7243 EnableLifetimeWarnings);
7244 }
7245 } else if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(L)) {
7246 if (MTE->getType().isConstQualified())
7247 visitLocalsRetainedByInitializer(Path, MTE->getSubExpr(), Visit,
7248 true, EnableLifetimeWarnings);
7249 }
7250 return false;
7251 }, EnableLifetimeWarnings);
7252
7253 // We assume that objects can be retained by pointers cast to integers,
7254 // but not if the integer is cast to floating-point type or to _Complex.
7255 // We assume that casts to 'bool' do not preserve enough information to
7256 // retain a local object.
7257 case CK_NoOp:
7258 case CK_BitCast:
7259 case CK_BaseToDerived:
7260 case CK_DerivedToBase:
7261 case CK_UncheckedDerivedToBase:
7262 case CK_Dynamic:
7263 case CK_ToUnion:
7264 case CK_UserDefinedConversion:
7265 case CK_ConstructorConversion:
7266 case CK_IntegralToPointer:
7267 case CK_PointerToIntegral:
7268 case CK_VectorSplat:
7269 case CK_IntegralCast:
7270 case CK_CPointerToObjCPointerCast:
7271 case CK_BlockPointerToObjCPointerCast:
7272 case CK_AnyPointerToBlockPointerCast:
7273 case CK_AddressSpaceConversion:
7274 break;
7275
7276 case CK_ArrayToPointerDecay:
7277 // Model array-to-pointer decay as taking the address of the array
7278 // lvalue.
7279 Path.push_back({IndirectLocalPathEntry::AddressOf, CE});
7280 return visitLocalsRetainedByReferenceBinding(Path, CE->getSubExpr(),
7281 RK_ReferenceBinding, Visit,
7282 EnableLifetimeWarnings);
7283
7284 default:
7285 return;
7286 }
7287
7288 Init = CE->getSubExpr();
7289 }
7290 } while (Old != Init);
7291
7292 // C++17 [dcl.init.list]p6:
7293 // initializing an initializer_list object from the array extends the
7294 // lifetime of the array exactly like binding a reference to a temporary.
7295 if (auto *ILE = dyn_cast<CXXStdInitializerListExpr>(Init))
7296 return visitLocalsRetainedByReferenceBinding(Path, ILE->getSubExpr(),
7297 RK_StdInitializerList, Visit,
7298 EnableLifetimeWarnings);
7299
7300 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) {
7301 // We already visited the elements of this initializer list while
7302 // performing the initialization. Don't visit them again unless we've
7303 // changed the lifetime of the initialized entity.
7304 if (!RevisitSubinits)
7305 return;
7306
7307 if (ILE->isTransparent())
7308 return visitLocalsRetainedByInitializer(Path, ILE->getInit(0), Visit,
7309 RevisitSubinits,
7310 EnableLifetimeWarnings);
7311
7312 if (ILE->getType()->isArrayType()) {
7313 for (unsigned I = 0, N = ILE->getNumInits(); I != N; ++I)
7314 visitLocalsRetainedByInitializer(Path, ILE->getInit(I), Visit,
7315 RevisitSubinits,
7316 EnableLifetimeWarnings);
7317 return;
7318 }
7319
7320 if (CXXRecordDecl *RD = ILE->getType()->getAsCXXRecordDecl()) {
7321 assert(RD->isAggregate() && "aggregate init on non-aggregate")((void)0);
7322
7323 // If we lifetime-extend a braced initializer which is initializing an
7324 // aggregate, and that aggregate contains reference members which are
7325 // bound to temporaries, those temporaries are also lifetime-extended.
7326 if (RD->isUnion() && ILE->getInitializedFieldInUnion() &&
7327 ILE->getInitializedFieldInUnion()->getType()->isReferenceType())
7328 visitLocalsRetainedByReferenceBinding(Path, ILE->getInit(0),
7329 RK_ReferenceBinding, Visit,
7330 EnableLifetimeWarnings);
7331 else {
7332 unsigned Index = 0;
7333 for (; Index < RD->getNumBases() && Index < ILE->getNumInits(); ++Index)
7334 visitLocalsRetainedByInitializer(Path, ILE->getInit(Index), Visit,
7335 RevisitSubinits,
7336 EnableLifetimeWarnings);
7337 for (const auto *I : RD->fields()) {
7338 if (Index >= ILE->getNumInits())
7339 break;
7340 if (I->isUnnamedBitfield())
7341 continue;
7342 Expr *SubInit = ILE->getInit(Index);
7343 if (I->getType()->isReferenceType())
7344 visitLocalsRetainedByReferenceBinding(Path, SubInit,
7345 RK_ReferenceBinding, Visit,
7346 EnableLifetimeWarnings);
7347 else
7348 // This might be either aggregate-initialization of a member or
7349 // initialization of a std::initializer_list object. Regardless,
7350 // we should recursively lifetime-extend that initializer.
7351 visitLocalsRetainedByInitializer(Path, SubInit, Visit,
7352 RevisitSubinits,
7353 EnableLifetimeWarnings);
7354 ++Index;
7355 }
7356 }
7357 }
7358 return;
7359 }
7360
7361 // The lifetime of an init-capture is that of the closure object constructed
7362 // by a lambda-expression.
7363 if (auto *LE = dyn_cast<LambdaExpr>(Init)) {
7364 LambdaExpr::capture_iterator CapI = LE->capture_begin();
7365 for (Expr *E : LE->capture_inits()) {
7366 assert(CapI != LE->capture_end())((void)0);
7367 const LambdaCapture &Cap = *CapI++;
7368 if (!E)
7369 continue;
7370 if (Cap.capturesVariable())
7371 Path.push_back({IndirectLocalPathEntry::LambdaCaptureInit, E, &Cap});
7372 if (E->isGLValue())
7373 visitLocalsRetainedByReferenceBinding(Path, E, RK_ReferenceBinding,
7374 Visit, EnableLifetimeWarnings);
7375 else
7376 visitLocalsRetainedByInitializer(Path, E, Visit, true,
7377 EnableLifetimeWarnings);
7378 if (Cap.capturesVariable())
7379 Path.pop_back();
7380 }
7381 }
7382
7383 // Assume that a copy or move from a temporary references the same objects
7384 // that the temporary does.
7385 if (auto *CCE = dyn_cast<CXXConstructExpr>(Init)) {
7386 if (CCE->getConstructor()->isCopyOrMoveConstructor()) {
7387 if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(CCE->getArg(0))) {
7388 Expr *Arg = MTE->getSubExpr();
7389 Path.push_back({IndirectLocalPathEntry::TemporaryCopy, Arg,
7390 CCE->getConstructor()});
7391 visitLocalsRetainedByInitializer(Path, Arg, Visit, true,
7392 /*EnableLifetimeWarnings*/false);
7393 Path.pop_back();
7394 }
7395 }
7396 }
7397
7398 if (isa<CallExpr>(Init) || isa<CXXConstructExpr>(Init)) {
7399 if (EnableLifetimeWarnings)
7400 handleGslAnnotatedTypes(Path, Init, Visit);
7401 return visitLifetimeBoundArguments(Path, Init, Visit);
7402 }
7403
7404 switch (Init->getStmtClass()) {
7405 case Stmt::UnaryOperatorClass: {
7406 auto *UO = cast<UnaryOperator>(Init);
7407 // If the initializer is the address of a local, we could have a lifetime
7408 // problem.
7409 if (UO->getOpcode() == UO_AddrOf) {
7410 // If this is &rvalue, then it's ill-formed and we have already diagnosed
7411 // it. Don't produce a redundant warning about the lifetime of the
7412 // temporary.
7413 if (isa<MaterializeTemporaryExpr>(UO->getSubExpr()))
7414 return;
7415
7416 Path.push_back({IndirectLocalPathEntry::AddressOf, UO});
7417 visitLocalsRetainedByReferenceBinding(Path, UO->getSubExpr(),
7418 RK_ReferenceBinding, Visit,
7419 EnableLifetimeWarnings);
7420 }
7421 break;
7422 }
7423
7424 case Stmt::BinaryOperatorClass: {
7425 // Handle pointer arithmetic.
7426 auto *BO = cast<BinaryOperator>(Init);
7427 BinaryOperatorKind BOK = BO->getOpcode();
7428 if (!BO->getType()->isPointerType() || (BOK != BO_Add && BOK != BO_Sub))
7429 break;
7430
7431 if (BO->getLHS()->getType()->isPointerType())
7432 visitLocalsRetainedByInitializer(Path, BO->getLHS(), Visit, true,
7433 EnableLifetimeWarnings);
7434 else if (BO->getRHS()->getType()->isPointerType())
7435 visitLocalsRetainedByInitializer(Path, BO->getRHS(), Visit, true,
7436 EnableLifetimeWarnings);
7437 break;
7438 }
7439
7440 case Stmt::ConditionalOperatorClass:
7441 case Stmt::BinaryConditionalOperatorClass: {
7442 auto *C = cast<AbstractConditionalOperator>(Init);
7443 // In C++, we can have a throw-expression operand, which has 'void' type
7444 // and isn't interesting from a lifetime perspective.
7445 if (!C->getTrueExpr()->getType()->isVoidType())
7446 visitLocalsRetainedByInitializer(Path, C->getTrueExpr(), Visit, true,
7447 EnableLifetimeWarnings);
7448 if (!C->getFalseExpr()->getType()->isVoidType())
7449 visitLocalsRetainedByInitializer(Path, C->getFalseExpr(), Visit, true,
7450 EnableLifetimeWarnings);
7451 break;
7452 }
7453
7454 case Stmt::BlockExprClass:
7455 if (cast<BlockExpr>(Init)->getBlockDecl()->hasCaptures()) {
7456 // This is a local block, whose lifetime is that of the function.
7457 Visit(Path, Local(cast<BlockExpr>(Init)), RK_ReferenceBinding);
7458 }
7459 break;
7460
7461 case Stmt::AddrLabelExprClass:
7462 // We want to warn if the address of a label would escape the function.
7463 Visit(Path, Local(cast<AddrLabelExpr>(Init)), RK_ReferenceBinding);
7464 break;
7465
7466 default:
7467 break;
7468 }
7469}
7470
7471/// Whether a path to an object supports lifetime extension.
7472enum PathLifetimeKind {
7473 /// Lifetime-extend along this path.
7474 Extend,
7475 /// We should lifetime-extend, but we don't because (due to technical
7476 /// limitations) we can't. This happens for default member initializers,
7477 /// which we don't clone for every use, so we don't have a unique
7478 /// MaterializeTemporaryExpr to update.
7479 ShouldExtend,
7480 /// Do not lifetime extend along this path.
7481 NoExtend
7482};
7483
7484/// Determine whether this is an indirect path to a temporary that we are
7485/// supposed to lifetime-extend along.
7486static PathLifetimeKind
7487shouldLifetimeExtendThroughPath(const IndirectLocalPath &Path) {
7488 PathLifetimeKind Kind = PathLifetimeKind::Extend;
7489 for (auto Elem : Path) {
7490 if (Elem.Kind == IndirectLocalPathEntry::DefaultInit)
7491 Kind = PathLifetimeKind::ShouldExtend;
7492 else if (Elem.Kind != IndirectLocalPathEntry::LambdaCaptureInit)
7493 return PathLifetimeKind::NoExtend;
7494 }
7495 return Kind;
7496}
7497
7498/// Find the range for the first interesting entry in the path at or after I.
7499static SourceRange nextPathEntryRange(const IndirectLocalPath &Path, unsigned I,
7500 Expr *E) {
7501 for (unsigned N = Path.size(); I != N; ++I) {
7502 switch (Path[I].Kind) {
7503 case IndirectLocalPathEntry::AddressOf:
7504 case IndirectLocalPathEntry::LValToRVal:
7505 case IndirectLocalPathEntry::LifetimeBoundCall:
7506 case IndirectLocalPathEntry::TemporaryCopy:
7507 case IndirectLocalPathEntry::GslReferenceInit:
7508 case IndirectLocalPathEntry::GslPointerInit:
7509 // These exist primarily to mark the path as not permitting or
7510 // supporting lifetime extension.
7511 break;
7512
7513 case IndirectLocalPathEntry::VarInit:
7514 if (cast<VarDecl>(Path[I].D)->isImplicit())
7515 return SourceRange();
7516 LLVM_FALLTHROUGH[[gnu::fallthrough]];
7517 case IndirectLocalPathEntry::DefaultInit:
7518 return Path[I].E->getSourceRange();
7519
7520 case IndirectLocalPathEntry::LambdaCaptureInit:
7521 if (!Path[I].Capture->capturesVariable())
7522 continue;
7523 return Path[I].E->getSourceRange();
7524 }
7525 }
7526 return E->getSourceRange();
7527}
7528
7529static bool pathOnlyInitializesGslPointer(IndirectLocalPath &Path) {
7530 for (auto It = Path.rbegin(), End = Path.rend(); It != End; ++It) {
7531 if (It->Kind == IndirectLocalPathEntry::VarInit)
7532 continue;
7533 if (It->Kind == IndirectLocalPathEntry::AddressOf)
7534 continue;
7535 if (It->Kind == IndirectLocalPathEntry::LifetimeBoundCall)
7536 continue;
7537 return It->Kind == IndirectLocalPathEntry::GslPointerInit ||
7538 It->Kind == IndirectLocalPathEntry::GslReferenceInit;
7539 }
7540 return false;
7541}
7542
7543void Sema::checkInitializerLifetime(const InitializedEntity &Entity,
7544 Expr *Init) {
7545 LifetimeResult LR = getEntityLifetime(&Entity);
7546 LifetimeKind LK = LR.getInt();
7547 const InitializedEntity *ExtendingEntity = LR.getPointer();
7548
7549 // If this entity doesn't have an interesting lifetime, don't bother looking
7550 // for temporaries within its initializer.
7551 if (LK == LK_FullExpression)
7552 return;
7553
7554 auto TemporaryVisitor = [&](IndirectLocalPath &Path, Local L,
7555 ReferenceKind RK) -> bool {
7556 SourceRange DiagRange = nextPathEntryRange(Path, 0, L);
7557 SourceLocation DiagLoc = DiagRange.getBegin();
7558
7559 auto *MTE = dyn_cast<MaterializeTemporaryExpr>(L);
7560
7561 bool IsGslPtrInitWithGslTempOwner = false;
7562 bool IsLocalGslOwner = false;
7563 if (pathOnlyInitializesGslPointer(Path)) {
7564 if (isa<DeclRefExpr>(L)) {
7565 // We do not want to follow the references when returning a pointer originating
7566 // from a local owner to avoid the following false positive:
7567 // int &p = *localUniquePtr;
7568 // someContainer.add(std::move(localUniquePtr));
7569 // return p;
7570 IsLocalGslOwner = isRecordWithAttr<OwnerAttr>(L->getType());
7571 if (pathContainsInit(Path) || !IsLocalGslOwner)
7572 return false;
7573 } else {
7574 IsGslPtrInitWithGslTempOwner = MTE && !MTE->getExtendingDecl() &&
7575 isRecordWithAttr<OwnerAttr>(MTE->getType());
7576 // Skipping a chain of initializing gsl::Pointer annotated objects.
7577 // We are looking only for the final source to find out if it was
7578 // a local or temporary owner or the address of a local variable/param.
7579 if (!IsGslPtrInitWithGslTempOwner)
7580 return true;
7581 }
7582 }
7583
7584 switch (LK) {
7585 case LK_FullExpression:
7586 llvm_unreachable("already handled this")__builtin_unreachable();
7587
7588 case LK_Extended: {
7589 if (!MTE) {
7590 // The initialized entity has lifetime beyond the full-expression,
7591 // and the local entity does too, so don't warn.
7592 //
7593 // FIXME: We should consider warning if a static / thread storage
7594 // duration variable retains an automatic storage duration local.
7595 return false;
7596 }
7597
7598 if (IsGslPtrInitWithGslTempOwner && DiagLoc.isValid()) {
7599 Diag(DiagLoc, diag::warn_dangling_lifetime_pointer) << DiagRange;
7600 return false;
7601 }
7602
7603 switch (shouldLifetimeExtendThroughPath(Path)) {
7604 case PathLifetimeKind::Extend:
7605 // Update the storage duration of the materialized temporary.
7606 // FIXME: Rebuild the expression instead of mutating it.
7607 MTE->setExtendingDecl(ExtendingEntity->getDecl(),
7608 ExtendingEntity->allocateManglingNumber());
7609 // Also visit the temporaries lifetime-extended by this initializer.
7610 return true;
7611
7612 case PathLifetimeKind::ShouldExtend:
7613 // We're supposed to lifetime-extend the temporary along this path (per
7614 // the resolution of DR1815), but we don't support that yet.
7615 //
7616 // FIXME: Properly handle this situation. Perhaps the easiest approach
7617 // would be to clone the initializer expression on each use that would
7618 // lifetime extend its temporaries.
7619 Diag(DiagLoc, diag::warn_unsupported_lifetime_extension)
7620 << RK << DiagRange;
7621 break;
7622
7623 case PathLifetimeKind::NoExtend:
7624 // If the path goes through the initialization of a variable or field,
7625 // it can't possibly reach a temporary created in this full-expression.
7626 // We will have already diagnosed any problems with the initializer.
7627 if (pathContainsInit(Path))
7628 return false;
7629
7630 Diag(DiagLoc, diag::warn_dangling_variable)
7631 << RK << !Entity.getParent()
7632 << ExtendingEntity->getDecl()->isImplicit()
7633 << ExtendingEntity->getDecl() << Init->isGLValue() << DiagRange;
7634 break;
7635 }
7636 break;
7637 }
7638
7639 case LK_MemInitializer: {
7640 if (isa<MaterializeTemporaryExpr>(L)) {
7641 // Under C++ DR1696, if a mem-initializer (or a default member
7642 // initializer used by the absence of one) would lifetime-extend a
7643 // temporary, the program is ill-formed.
7644 if (auto *ExtendingDecl =
7645 ExtendingEntity ? ExtendingEntity->getDecl() : nullptr) {
7646 if (IsGslPtrInitWithGslTempOwner) {
7647 Diag(DiagLoc, diag::warn_dangling_lifetime_pointer_member)
7648 << ExtendingDecl << DiagRange;
7649 Diag(ExtendingDecl->getLocation(),
7650 diag::note_ref_or_ptr_member_declared_here)
7651 << true;
7652 return false;
7653 }
7654 bool IsSubobjectMember = ExtendingEntity != &Entity;
7655 Diag(DiagLoc, shouldLifetimeExtendThroughPath(Path) !=
7656 PathLifetimeKind::NoExtend
7657 ? diag::err_dangling_member
7658 : diag::warn_dangling_member)
7659 << ExtendingDecl << IsSubobjectMember << RK << DiagRange;
7660 // Don't bother adding a note pointing to the field if we're inside
7661 // its default member initializer; our primary diagnostic points to
7662 // the same place in that case.
7663 if (Path.empty() ||
7664 Path.back().Kind != IndirectLocalPathEntry::DefaultInit) {
7665 Diag(ExtendingDecl->getLocation(),
7666 diag::note_lifetime_extending_member_declared_here)
7667 << RK << IsSubobjectMember;
7668 }
7669 } else {
7670 // We have a mem-initializer but no particular field within it; this
7671 // is either a base class or a delegating initializer directly
7672 // initializing the base-class from something that doesn't live long
7673 // enough.
7674 //
7675 // FIXME: Warn on this.
7676 return false;
7677 }
7678 } else {
7679 // Paths via a default initializer can only occur during error recovery
7680 // (there's no other way that a default initializer can refer to a
7681 // local). Don't produce a bogus warning on those cases.
7682 if (pathContainsInit(Path))
7683 return false;
7684
7685 // Suppress false positives for code like the one below:
7686 // Ctor(unique_ptr<T> up) : member(*up), member2(move(up)) {}
7687 if (IsLocalGslOwner && pathOnlyInitializesGslPointer(Path))
7688 return false;
7689
7690 auto *DRE = dyn_cast<DeclRefExpr>(L);
7691 auto *VD = DRE ? dyn_cast<VarDecl>(DRE->getDecl()) : nullptr;
7692 if (!VD) {
7693 // A member was initialized to a local block.
7694 // FIXME: Warn on this.
7695 return false;
7696 }
7697
7698 if (auto *Member =
7699 ExtendingEntity ? ExtendingEntity->getDecl() : nullptr) {
7700 bool IsPointer = !Member->getType()->isReferenceType();
7701 Diag(DiagLoc, IsPointer ? diag::warn_init_ptr_member_to_parameter_addr
7702 : diag::warn_bind_ref_member_to_parameter)
7703 << Member << VD << isa<ParmVarDecl>(VD) << DiagRange;
7704 Diag(Member->getLocation(),
7705 diag::note_ref_or_ptr_member_declared_here)
7706 << (unsigned)IsPointer;
7707 }
7708 }
7709 break;
7710 }
7711
7712 case LK_New:
7713 if (isa<MaterializeTemporaryExpr>(L)) {
7714 if (IsGslPtrInitWithGslTempOwner)
7715 Diag(DiagLoc, diag::warn_dangling_lifetime_pointer) << DiagRange;
7716 else
7717 Diag(DiagLoc, RK == RK_ReferenceBinding
7718 ? diag::warn_new_dangling_reference
7719 : diag::warn_new_dangling_initializer_list)
7720 << !Entity.getParent() << DiagRange;
7721 } else {
7722 // We can't determine if the allocation outlives the local declaration.
7723 return false;
7724 }
7725 break;
7726
7727 case LK_Return:
7728 case LK_StmtExprResult:
7729 if (auto *DRE = dyn_cast<DeclRefExpr>(L)) {
7730 // We can't determine if the local variable outlives the statement
7731 // expression.
7732 if (LK == LK_StmtExprResult)
7733 return false;
7734 Diag(DiagLoc, diag::warn_ret_stack_addr_ref)
7735 << Entity.getType()->isReferenceType() << DRE->getDecl()
7736 << isa<ParmVarDecl>(DRE->getDecl()) << DiagRange;
7737 } else if (isa<BlockExpr>(L)) {
7738 Diag(DiagLoc, diag::err_ret_local_block) << DiagRange;
7739 } else if (isa<AddrLabelExpr>(L)) {
7740 // Don't warn when returning a label from a statement expression.
7741 // Leaving the scope doesn't end its lifetime.
7742 if (LK == LK_StmtExprResult)
7743 return false;
7744 Diag(DiagLoc, diag::warn_ret_addr_label) << DiagRange;
7745 } else {
7746 Diag(DiagLoc, diag::warn_ret_local_temp_addr_ref)
7747 << Entity.getType()->isReferenceType() << DiagRange;
7748 }
7749 break;
7750 }
7751
7752 for (unsigned I = 0; I != Path.size(); ++I) {
7753 auto Elem = Path[I];
7754
7755 switch (Elem.Kind) {
7756 case IndirectLocalPathEntry::AddressOf:
7757 case IndirectLocalPathEntry::LValToRVal:
7758 // These exist primarily to mark the path as not permitting or
7759 // supporting lifetime extension.
7760 break;
7761
7762 case IndirectLocalPathEntry::LifetimeBoundCall:
7763 case IndirectLocalPathEntry::TemporaryCopy:
7764 case IndirectLocalPathEntry::GslPointerInit:
7765 case IndirectLocalPathEntry::GslReferenceInit:
7766 // FIXME: Consider adding a note for these.
7767 break;
7768
7769 case IndirectLocalPathEntry::DefaultInit: {
7770 auto *FD = cast<FieldDecl>(Elem.D);
7771 Diag(FD->getLocation(), diag::note_init_with_default_member_initalizer)
7772 << FD << nextPathEntryRange(Path, I + 1, L);
7773 break;
7774 }
7775
7776 case IndirectLocalPathEntry::VarInit: {
7777 const VarDecl *VD = cast<VarDecl>(Elem.D);
7778 Diag(VD->getLocation(), diag::note_local_var_initializer)
7779 << VD->getType()->isReferenceType()
7780 << VD->isImplicit() << VD->getDeclName()
7781 << nextPathEntryRange(Path, I + 1, L);
7782 break;
7783 }
7784
7785 case IndirectLocalPathEntry::LambdaCaptureInit:
7786 if (!Elem.Capture->capturesVariable())
7787 break;
7788 // FIXME: We can't easily tell apart an init-capture from a nested
7789 // capture of an init-capture.
7790 const VarDecl *VD = Elem.Capture->getCapturedVar();
7791 Diag(Elem.Capture->getLocation(), diag::note_lambda_capture_initializer)
7792 << VD << VD->isInitCapture() << Elem.Capture->isExplicit()
7793 << (Elem.Capture->getCaptureKind() == LCK_ByRef) << VD
7794 << nextPathEntryRange(Path, I + 1, L);
7795 break;
7796 }
7797 }
7798
7799 // We didn't lifetime-extend, so don't go any further; we don't need more
7800 // warnings or errors on inner temporaries within this one's initializer.
7801 return false;
7802 };
7803
7804 bool EnableLifetimeWarnings = !getDiagnostics().isIgnored(
7805 diag::warn_dangling_lifetime_pointer, SourceLocation());
7806 llvm::SmallVector<IndirectLocalPathEntry, 8> Path;
7807 if (Init->isGLValue())
7808 visitLocalsRetainedByReferenceBinding(Path, Init, RK_ReferenceBinding,
7809 TemporaryVisitor,
7810 EnableLifetimeWarnings);
7811 else
7812 visitLocalsRetainedByInitializer(Path, Init, TemporaryVisitor, false,
7813 EnableLifetimeWarnings);
7814}
7815
7816static void DiagnoseNarrowingInInitList(Sema &S,
7817 const ImplicitConversionSequence &ICS,
7818 QualType PreNarrowingType,
7819 QualType EntityType,
7820 const Expr *PostInit);
7821
7822/// Provide warnings when std::move is used on construction.
7823static void CheckMoveOnConstruction(Sema &S, const Expr *InitExpr,
7824 bool IsReturnStmt) {
7825 if (!InitExpr)
7826 return;
7827
7828 if (S.inTemplateInstantiation())
7829 return;
7830
7831 QualType DestType = InitExpr->getType();
7832 if (!DestType->isRecordType())
7833 return;
7834
7835 unsigned DiagID = 0;
7836 if (IsReturnStmt) {
7837 const CXXConstructExpr *CCE =
7838 dyn_cast<CXXConstructExpr>(InitExpr->IgnoreParens());
7839 if (!CCE || CCE->getNumArgs() != 1)
7840 return;
7841
7842 if (!CCE->getConstructor()->isCopyOrMoveConstructor())
7843 return;
7844
7845 InitExpr = CCE->getArg(0)->IgnoreImpCasts();
7846 }
7847
7848 // Find the std::move call and get the argument.
7849 const CallExpr *CE = dyn_cast<CallExpr>(InitExpr->IgnoreParens());
7850 if (!CE || !CE->isCallToStdMove())
7851 return;
7852
7853 const Expr *Arg = CE->getArg(0)->IgnoreImplicit();
7854
7855 if (IsReturnStmt) {
7856 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg->IgnoreParenImpCasts());
7857 if (!DRE || DRE->refersToEnclosingVariableOrCapture())
7858 return;
7859
7860 const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl());
7861 if (!VD || !VD->hasLocalStorage())
7862 return;
7863
7864 // __block variables are not moved implicitly.
7865 if (VD->hasAttr<BlocksAttr>())
7866 return;
7867
7868 QualType SourceType = VD->getType();
7869 if (!SourceType->isRecordType())
7870 return;
7871
7872 if (!S.Context.hasSameUnqualifiedType(DestType, SourceType)) {
7873 return;
7874 }
7875
7876 // If we're returning a function parameter, copy elision
7877 // is not possible.
7878 if (isa<ParmVarDecl>(VD))
7879 DiagID = diag::warn_redundant_move_on_return;
7880 else
7881 DiagID = diag::warn_pessimizing_move_on_return;
7882 } else {
7883 DiagID = diag::warn_pessimizing_move_on_initialization;
7884 const Expr *ArgStripped = Arg->IgnoreImplicit()->IgnoreParens();
7885 if (!ArgStripped->isPRValue() || !ArgStripped->getType()->isRecordType())
7886 return;
7887 }
7888
7889 S.Diag(CE->getBeginLoc(), DiagID);
7890
7891 // Get all the locations for a fix-it. Don't emit the fix-it if any location
7892 // is within a macro.
7893 SourceLocation CallBegin = CE->getCallee()->getBeginLoc();
7894 if (CallBegin.isMacroID())
7895 return;
7896 SourceLocation RParen = CE->getRParenLoc();
7897 if (RParen.isMacroID())
7898 return;
7899 SourceLocation LParen;
7900 SourceLocation ArgLoc = Arg->getBeginLoc();
7901
7902 // Special testing for the argument location. Since the fix-it needs the
7903 // location right before the argument, the argument location can be in a
7904 // macro only if it is at the beginning of the macro.
7905 while (ArgLoc.isMacroID() &&
7906 S.getSourceManager().isAtStartOfImmediateMacroExpansion(ArgLoc)) {
7907 ArgLoc = S.getSourceManager().getImmediateExpansionRange(ArgLoc).getBegin();
7908 }
7909
7910 if (LParen.isMacroID())
7911 return;
7912
7913 LParen = ArgLoc.getLocWithOffset(-1);
7914
7915 S.Diag(CE->getBeginLoc(), diag::note_remove_move)
7916 << FixItHint::CreateRemoval(SourceRange(CallBegin, LParen))
7917 << FixItHint::CreateRemoval(SourceRange(RParen, RParen));
7918}
7919
7920static void CheckForNullPointerDereference(Sema &S, const Expr *E) {
7921 // Check to see if we are dereferencing a null pointer. If so, this is
7922 // undefined behavior, so warn about it. This only handles the pattern
7923 // "*null", which is a very syntactic check.
7924 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts()))
7925 if (UO->getOpcode() == UO_Deref &&
7926 UO->getSubExpr()->IgnoreParenCasts()->
7927 isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull)) {
7928 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
7929 S.PDiag(diag::warn_binding_null_to_reference)
7930 << UO->getSubExpr()->getSourceRange());
7931 }
7932}
7933
7934MaterializeTemporaryExpr *
7935Sema::CreateMaterializeTemporaryExpr(QualType T, Expr *Temporary,
7936 bool BoundToLvalueReference) {
7937 auto MTE = new (Context)
7938 MaterializeTemporaryExpr(T, Temporary, BoundToLvalueReference);
7939
7940 // Order an ExprWithCleanups for lifetime marks.
7941 //
7942 // TODO: It'll be good to have a single place to check the access of the
7943 // destructor and generate ExprWithCleanups for various uses. Currently these
7944 // are done in both CreateMaterializeTemporaryExpr and MaybeBindToTemporary,
7945 // but there may be a chance to merge them.
7946 Cleanup.setExprNeedsCleanups(false);
7947 return MTE;
7948}
7949
7950ExprResult Sema::TemporaryMaterializationConversion(Expr *E) {
7951 // In C++98, we don't want to implicitly create an xvalue.
7952 // FIXME: This means that AST consumers need to deal with "prvalues" that
7953 // denote materialized temporaries. Maybe we should add another ValueKind
7954 // for "xvalue pretending to be a prvalue" for C++98 support.
7955 if (!E->isPRValue() || !getLangOpts().CPlusPlus11)
7956 return E;
7957
7958 // C++1z [conv.rval]/1: T shall be a complete type.
7959 // FIXME: Does this ever matter (can we form a prvalue of incomplete type)?
7960 // If so, we should check for a non-abstract class type here too.
7961 QualType T = E->getType();
7962 if (RequireCompleteType(E->getExprLoc(), T, diag::err_incomplete_type))
7963 return ExprError();
7964
7965 return CreateMaterializeTemporaryExpr(E->getType(), E, false);
7966}
7967
7968ExprResult Sema::PerformQualificationConversion(Expr *E, QualType Ty,
7969 ExprValueKind VK,
7970 CheckedConversionKind CCK) {
7971
7972 CastKind CK = CK_NoOp;
7973
7974 if (VK == VK_PRValue) {
7975 auto PointeeTy = Ty->getPointeeType();
7976 auto ExprPointeeTy = E->getType()->getPointeeType();
7977 if (!PointeeTy.isNull() &&
7978 PointeeTy.getAddressSpace() != ExprPointeeTy.getAddressSpace())
7979 CK = CK_AddressSpaceConversion;
7980 } else if (Ty.getAddressSpace() != E->getType().getAddressSpace()) {
7981 CK = CK_AddressSpaceConversion;
7982 }
7983
7984 return ImpCastExprToType(E, Ty, CK, VK, /*BasePath=*/nullptr, CCK);
7985}
7986
7987ExprResult InitializationSequence::Perform(Sema &S,
7988 const InitializedEntity &Entity,
7989 const InitializationKind &Kind,
7990 MultiExprArg Args,
7991 QualType *ResultType) {
7992 if (Failed()) {
7993 Diagnose(S, Entity, Kind, Args);
7994 return ExprError();
7995 }
7996 if (!ZeroInitializationFixit.empty()) {
7997 unsigned DiagID = diag::err_default_init_const;
7998 if (Decl *D = Entity.getDecl())
7999 if (S.getLangOpts().MSVCCompat && D->hasAttr<SelectAnyAttr>())
8000 DiagID = diag::ext_default_init_const;
8001
8002 // The initialization would have succeeded with this fixit. Since the fixit
8003 // is on the error, we need to build a valid AST in this case, so this isn't
8004 // handled in the Failed() branch above.
8005 QualType DestType = Entity.getType();
8006 S.Diag(Kind.getLocation(), DiagID)
8007 << DestType << (bool)DestType->getAs<RecordType>()
8008 << FixItHint::CreateInsertion(ZeroInitializationFixitLoc,
8009 ZeroInitializationFixit);
8010 }
8011
8012 if (getKind() == DependentSequence) {
8013 // If the declaration is a non-dependent, incomplete array type
8014 // that has an initializer, then its type will be completed once
8015 // the initializer is instantiated.
8016 if (ResultType && !Entity.getType()->isDependentType() &&
8017 Args.size() == 1) {
8018 QualType DeclType = Entity.getType();
8019 if (const IncompleteArrayType *ArrayT
8020 = S.Context.getAsIncompleteArrayType(DeclType)) {
8021 // FIXME: We don't currently have the ability to accurately
8022 // compute the length of an initializer list without
8023 // performing full type-checking of the initializer list
8024 // (since we have to determine where braces are implicitly
8025 // introduced and such). So, we fall back to making the array
8026 // type a dependently-sized array type with no specified
8027 // bound.
8028 if (isa<InitListExpr>((Expr *)Args[0])) {
8029 SourceRange Brackets;
8030
8031 // Scavange the location of the brackets from the entity, if we can.
8032 if (auto *DD = dyn_cast_or_null<DeclaratorDecl>(Entity.getDecl())) {
8033 if (TypeSourceInfo *TInfo = DD->getTypeSourceInfo()) {
8034 TypeLoc TL = TInfo->getTypeLoc();
8035 if (IncompleteArrayTypeLoc ArrayLoc =
8036 TL.getAs<IncompleteArrayTypeLoc>())
8037 Brackets = ArrayLoc.getBracketsRange();
8038 }
8039 }
8040
8041 *ResultType
8042 = S.Context.getDependentSizedArrayType(ArrayT->getElementType(),
8043 /*NumElts=*/nullptr,
8044 ArrayT->getSizeModifier(),
8045 ArrayT->getIndexTypeCVRQualifiers(),
8046 Brackets);
8047 }
8048
8049 }
8050 }
8051 if (Kind.getKind() == InitializationKind::IK_Direct &&
8052 !Kind.isExplicitCast()) {
8053 // Rebuild the ParenListExpr.
8054 SourceRange ParenRange = Kind.getParenOrBraceRange();
8055 return S.ActOnParenListExpr(ParenRange.getBegin(), ParenRange.getEnd(),
8056 Args);
8057 }
8058 assert(Kind.getKind() == InitializationKind::IK_Copy ||((void)0)
8059 Kind.isExplicitCast() ||((void)0)
8060 Kind.getKind() == InitializationKind::IK_DirectList)((void)0);
8061 return ExprResult(Args[0]);
8062 }
8063
8064 // No steps means no initialization.
8065 if (Steps.empty())
8066 return ExprResult((Expr *)nullptr);
8067
8068 if (S.getLangOpts().CPlusPlus11 && Entity.getType()->isReferenceType() &&
8069 Args.size() == 1 && isa<InitListExpr>(Args[0]) &&
8070 !Entity.isParamOrTemplateParamKind()) {
8071 // Produce a C++98 compatibility warning if we are initializing a reference
8072 // from an initializer list. For parameters, we produce a better warning
8073 // elsewhere.
8074 Expr *Init = Args[0];
8075 S.Diag(Init->getBeginLoc(), diag::warn_cxx98_compat_reference_list_init)
8076 << Init->getSourceRange();
8077 }
8078
8079 // OpenCL v2.0 s6.13.11.1. atomic variables can be initialized in global scope
8080 QualType ETy = Entity.getType();
8081 bool HasGlobalAS = ETy.hasAddressSpace() &&
8082 ETy.getAddressSpace() == LangAS::opencl_global;
8083
8084 if (S.getLangOpts().OpenCLVersion >= 200 &&
8085 ETy->isAtomicType() && !HasGlobalAS &&
8086 Entity.getKind() == InitializedEntity::EK_Variable && Args.size() > 0) {
8087 S.Diag(Args[0]->getBeginLoc(), diag::err_opencl_atomic_init)
8088 << 1
8089 << SourceRange(Entity.getDecl()->getBeginLoc(), Args[0]->getEndLoc());
8090 return ExprError();
8091 }
8092
8093 QualType DestType = Entity.getType().getNonReferenceType();
8094 // FIXME: Ugly hack around the fact that Entity.getType() is not
8095 // the same as Entity.getDecl()->getType() in cases involving type merging,
8096 // and we want latter when it makes sense.
8097 if (ResultType)
8098 *ResultType = Entity.getDecl() ? Entity.getDecl()->getType() :
8099 Entity.getType();
8100
8101 ExprResult CurInit((Expr *)nullptr);
8102 SmallVector<Expr*, 4> ArrayLoopCommonExprs;
8103
8104 // For initialization steps that start with a single initializer,
8105 // grab the only argument out the Args and place it into the "current"
8106 // initializer.
8107 switch (Steps.front().Kind) {
8108 case SK_ResolveAddressOfOverloadedFunction:
8109 case SK_CastDerivedToBasePRValue:
8110 case SK_CastDerivedToBaseXValue:
8111 case SK_CastDerivedToBaseLValue:
8112 case SK_BindReference:
8113 case SK_BindReferenceToTemporary:
8114 case SK_FinalCopy:
8115 case SK_ExtraneousCopyToTemporary:
8116 case SK_UserConversion:
8117 case SK_QualificationConversionLValue:
8118 case SK_QualificationConversionXValue:
8119 case SK_QualificationConversionPRValue:
8120 case SK_FunctionReferenceConversion:
8121 case SK_AtomicConversion:
8122 case SK_ConversionSequence:
8123 case SK_ConversionSequenceNoNarrowing:
8124 case SK_ListInitialization:
8125 case SK_UnwrapInitList:
8126 case SK_RewrapInitList:
8127 case SK_CAssignment:
8128 case SK_StringInit:
8129 case SK_ObjCObjectConversion:
8130 case SK_ArrayLoopIndex:
8131 case SK_ArrayLoopInit:
8132 case SK_ArrayInit:
8133 case SK_GNUArrayInit:
8134 case SK_ParenthesizedArrayInit:
8135 case SK_PassByIndirectCopyRestore:
8136 case SK_PassByIndirectRestore:
8137 case SK_ProduceObjCObject:
8138 case SK_StdInitializerList:
8139 case SK_OCLSamplerInit:
8140 case SK_OCLZeroOpaqueType: {
8141 assert(Args.size() == 1)((void)0);
8142 CurInit = Args[0];
8143 if (!CurInit.get()) return ExprError();
8144 break;
8145 }
8146
8147 case SK_ConstructorInitialization:
8148 case SK_ConstructorInitializationFromList:
8149 case SK_StdInitializerListConstructorCall:
8150 case SK_ZeroInitialization:
8151 break;
8152 }
8153
8154 // Promote from an unevaluated context to an unevaluated list context in
8155 // C++11 list-initialization; we need to instantiate entities usable in
8156 // constant expressions here in order to perform narrowing checks =(
8157 EnterExpressionEvaluationContext Evaluated(
8158 S, EnterExpressionEvaluationContext::InitList,
8159 CurInit.get() && isa<InitListExpr>(CurInit.get()));
8160
8161 // C++ [class.abstract]p2:
8162 // no objects of an abstract class can be created except as subobjects
8163 // of a class derived from it
8164 auto checkAbstractType = [&](QualType T) -> bool {
8165 if (Entity.getKind() == InitializedEntity::EK_Base ||
8166 Entity.getKind() == InitializedEntity::EK_Delegating)
8167 return false;
8168 return S.RequireNonAbstractType(Kind.getLocation(), T,
8169 diag::err_allocation_of_abstract_type);
8170 };
8171
8172 // Walk through the computed steps for the initialization sequence,
8173 // performing the specified conversions along the way.
8174 bool ConstructorInitRequiresZeroInit = false;
8175 for (step_iterator Step = step_begin(), StepEnd = step_end();
8176 Step != StepEnd; ++Step) {
8177 if (CurInit.isInvalid())
8178 return ExprError();
8179
8180 QualType SourceType = CurInit.get() ? CurInit.get()->getType() : QualType();
8181
8182 switch (Step->Kind) {
8183 case SK_ResolveAddressOfOverloadedFunction:
8184 // Overload resolution determined which function invoke; update the
8185 // initializer to reflect that choice.
8186 S.CheckAddressOfMemberAccess(CurInit.get(), Step->Function.FoundDecl);
8187 if (S.DiagnoseUseOfDecl(Step->Function.FoundDecl, Kind.getLocation()))
8188 return ExprError();
8189 CurInit = S.FixOverloadedFunctionReference(CurInit,
8190 Step->Function.FoundDecl,
8191 Step->Function.Function);
8192 break;
8193
8194 case SK_CastDerivedToBasePRValue:
8195 case SK_CastDerivedToBaseXValue:
8196 case SK_CastDerivedToBaseLValue: {
8197 // We have a derived-to-base cast that produces either an rvalue or an
8198 // lvalue. Perform that cast.
8199
8200 CXXCastPath BasePath;
8201
8202 // Casts to inaccessible base classes are allowed with C-style casts.
8203 bool IgnoreBaseAccess = Kind.isCStyleOrFunctionalCast();
8204 if (S.CheckDerivedToBaseConversion(
8205 SourceType, Step->Type, CurInit.get()->getBeginLoc(),
8206 CurInit.get()->getSourceRange(), &BasePath, IgnoreBaseAccess))
8207 return ExprError();
8208
8209 ExprValueKind VK =
8210 Step->Kind == SK_CastDerivedToBaseLValue
8211 ? VK_LValue
8212 : (Step->Kind == SK_CastDerivedToBaseXValue ? VK_XValue
8213 : VK_PRValue);
8214 CurInit = ImplicitCastExpr::Create(S.Context, Step->Type,
8215 CK_DerivedToBase, CurInit.get(),
8216 &BasePath, VK, FPOptionsOverride());
8217 break;
8218 }
8219
8220 case SK_BindReference:
8221 // Reference binding does not have any corresponding ASTs.
8222
8223 // Check exception specifications
8224 if (S.CheckExceptionSpecCompatibility(CurInit.get(), DestType))
8225 return ExprError();
8226
8227 // We don't check for e.g. function pointers here, since address
8228 // availability checks should only occur when the function first decays
8229 // into a pointer or reference.
8230 if (CurInit.get()->getType()->isFunctionProtoType()) {
8231 if (auto *DRE = dyn_cast<DeclRefExpr>(CurInit.get()->IgnoreParens())) {
8232 if (auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl())) {
8233 if (!S.checkAddressOfFunctionIsAvailable(FD, /*Complain=*/true,
8234 DRE->getBeginLoc()))
8235 return ExprError();
8236 }
8237 }
8238 }
8239
8240 CheckForNullPointerDereference(S, CurInit.get());
8241 break;
8242
8243 case SK_BindReferenceToTemporary: {
8244 // Make sure the "temporary" is actually an rvalue.
8245 assert(CurInit.get()->isPRValue() && "not a temporary")((void)0);
8246
8247 // Check exception specifications
8248 if (S.CheckExceptionSpecCompatibility(CurInit.get(), DestType))
8249 return ExprError();
8250
8251 QualType MTETy = Step->Type;
8252
8253 // When this is an incomplete array type (such as when this is
8254 // initializing an array of unknown bounds from an init list), use THAT
8255 // type instead so that we propogate the array bounds.
8256 if (MTETy->isIncompleteArrayType() &&
8257 !CurInit.get()->getType()->isIncompleteArrayType() &&
8258 S.Context.hasSameType(
8259 MTETy->getPointeeOrArrayElementType(),
8260 CurInit.get()->getType()->getPointeeOrArrayElementType()))
8261 MTETy = CurInit.get()->getType();
8262
8263 // Materialize the temporary into memory.
8264 MaterializeTemporaryExpr *MTE = S.CreateMaterializeTemporaryExpr(
8265 MTETy, CurInit.get(), Entity.getType()->isLValueReferenceType());
8266 CurInit = MTE;
8267
8268 // If we're extending this temporary to automatic storage duration -- we
8269 // need to register its cleanup during the full-expression's cleanups.
8270 if (MTE->getStorageDuration() == SD_Automatic &&
8271 MTE->getType().isDestructedType())
8272 S.Cleanup.setExprNeedsCleanups(true);
8273 break;
8274 }
8275
8276 case SK_FinalCopy:
8277 if (checkAbstractType(Step->Type))
8278 return ExprError();
8279
8280 // If the overall initialization is initializing a temporary, we already
8281 // bound our argument if it was necessary to do so. If not (if we're
8282 // ultimately initializing a non-temporary), our argument needs to be
8283 // bound since it's initializing a function parameter.
8284 // FIXME: This is a mess. Rationalize temporary destruction.
8285 if (!shouldBindAsTemporary(Entity))
8286 CurInit = S.MaybeBindToTemporary(CurInit.get());
8287 CurInit = CopyObject(S, Step->Type, Entity, CurInit,
8288 /*IsExtraneousCopy=*/false);
8289 break;
8290
8291 case SK_ExtraneousCopyToTemporary:
8292 CurInit = CopyObject(S, Step->Type, Entity, CurInit,
8293 /*IsExtraneousCopy=*/true);
8294 break;
8295
8296 case SK_UserConversion: {
8297 // We have a user-defined conversion that invokes either a constructor
8298 // or a conversion function.
8299 CastKind CastKind;
8300 FunctionDecl *Fn = Step->Function.Function;
8301 DeclAccessPair FoundFn = Step->Function.FoundDecl;
8302 bool HadMultipleCandidates = Step->Function.HadMultipleCandidates;
8303 bool CreatedObject = false;
8304 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Fn)) {
8305 // Build a call to the selected constructor.
8306 SmallVector<Expr*, 8> ConstructorArgs;
8307 SourceLocation Loc = CurInit.get()->getBeginLoc();
8308
8309 // Determine the arguments required to actually perform the constructor
8310 // call.
8311 Expr *Arg = CurInit.get();
8312 if (S.CompleteConstructorCall(Constructor, Step->Type,
8313 MultiExprArg(&Arg, 1), Loc,
8314 ConstructorArgs))
8315 return ExprError();
8316
8317 // Build an expression that constructs a temporary.
8318 CurInit = S.BuildCXXConstructExpr(Loc, Step->Type,
8319 FoundFn, Constructor,
8320 ConstructorArgs,
8321 HadMultipleCandidates,
8322 /*ListInit*/ false,
8323 /*StdInitListInit*/ false,
8324 /*ZeroInit*/ false,
8325 CXXConstructExpr::CK_Complete,
8326 SourceRange());
8327 if (CurInit.isInvalid())
8328 return ExprError();
8329
8330 S.CheckConstructorAccess(Kind.getLocation(), Constructor, FoundFn,
8331 Entity);
8332 if (S.DiagnoseUseOfDecl(FoundFn, Kind.getLocation()))
8333 return ExprError();
8334
8335 CastKind = CK_ConstructorConversion;
8336 CreatedObject = true;
8337 } else {
8338 // Build a call to the conversion function.
8339 CXXConversionDecl *Conversion = cast<CXXConversionDecl>(Fn);
8340 S.CheckMemberOperatorAccess(Kind.getLocation(), CurInit.get(), nullptr,
8341 FoundFn);
8342 if (S.DiagnoseUseOfDecl(FoundFn, Kind.getLocation()))
8343 return ExprError();
8344
8345 CurInit = S.BuildCXXMemberCallExpr(CurInit.get(), FoundFn, Conversion,
8346 HadMultipleCandidates);
8347 if (CurInit.isInvalid())
8348 return ExprError();
8349
8350 CastKind = CK_UserDefinedConversion;
8351 CreatedObject = Conversion->getReturnType()->isRecordType();
8352 }
8353
8354 if (CreatedObject && checkAbstractType(CurInit.get()->getType()))
8355 return ExprError();
8356
8357 CurInit = ImplicitCastExpr::Create(
8358 S.Context, CurInit.get()->getType(), CastKind, CurInit.get(), nullptr,
8359 CurInit.get()->getValueKind(), S.CurFPFeatureOverrides());
8360
8361 if (shouldBindAsTemporary(Entity))
8362 // The overall entity is temporary, so this expression should be
8363 // destroyed at the end of its full-expression.
8364 CurInit = S.MaybeBindToTemporary(CurInit.getAs<Expr>());
8365 else if (CreatedObject && shouldDestroyEntity(Entity)) {
8366 // The object outlasts the full-expression, but we need to prepare for
8367 // a destructor being run on it.
8368 // FIXME: It makes no sense to do this here. This should happen
8369 // regardless of how we initialized the entity.
8370 QualType T = CurInit.get()->getType();
8371 if (const RecordType *Record = T->getAs<RecordType>()) {
8372 CXXDestructorDecl *Destructor
8373 = S.LookupDestructor(cast<CXXRecordDecl>(Record->getDecl()));
8374 S.CheckDestructorAccess(CurInit.get()->getBeginLoc(), Destructor,
8375 S.PDiag(diag::err_access_dtor_temp) << T);
8376 S.MarkFunctionReferenced(CurInit.get()->getBeginLoc(), Destructor);
8377 if (S.DiagnoseUseOfDecl(Destructor, CurInit.get()->getBeginLoc()))
8378 return ExprError();
8379 }
8380 }
8381 break;
8382 }
8383
8384 case SK_QualificationConversionLValue:
8385 case SK_QualificationConversionXValue:
8386 case SK_QualificationConversionPRValue: {
8387 // Perform a qualification conversion; these can never go wrong.
8388 ExprValueKind VK =
8389 Step->Kind == SK_QualificationConversionLValue
8390 ? VK_LValue
8391 : (Step->Kind == SK_QualificationConversionXValue ? VK_XValue
8392 : VK_PRValue);
8393 CurInit = S.PerformQualificationConversion(CurInit.get(), Step->Type, VK);
8394 break;
8395 }
8396
8397 case SK_FunctionReferenceConversion:
8398 assert(CurInit.get()->isLValue() &&((void)0)
8399 "function reference should be lvalue")((void)0);
8400 CurInit =
8401 S.ImpCastExprToType(CurInit.get(), Step->Type, CK_NoOp, VK_LValue);
8402 break;
8403
8404 case SK_AtomicConversion: {
8405 assert(CurInit.get()->isPRValue() && "cannot convert glvalue to atomic")((void)0);
8406 CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
8407 CK_NonAtomicToAtomic, VK_PRValue);
8408 break;
8409 }
8410
8411 case SK_ConversionSequence:
8412 case SK_ConversionSequenceNoNarrowing: {
8413 if (const auto *FromPtrType =
8414 CurInit.get()->getType()->getAs<PointerType>()) {
8415 if (const auto *ToPtrType = Step->Type->getAs<PointerType>()) {
8416 if (FromPtrType->getPointeeType()->hasAttr(attr::NoDeref) &&
8417 !ToPtrType->getPointeeType()->hasAttr(attr::NoDeref)) {
8418 // Do not check static casts here because they are checked earlier
8419 // in Sema::ActOnCXXNamedCast()
8420 if (!Kind.isStaticCast()) {
8421 S.Diag(CurInit.get()->getExprLoc(),
8422 diag::warn_noderef_to_dereferenceable_pointer)
8423 << CurInit.get()->getSourceRange();
8424 }
8425 }
8426 }
8427 }
8428
8429 Sema::CheckedConversionKind CCK
8430 = Kind.isCStyleCast()? Sema::CCK_CStyleCast
8431 : Kind.isFunctionalCast()? Sema::CCK_FunctionalCast
8432 : Kind.isExplicitCast()? Sema::CCK_OtherCast
8433 : Sema::CCK_ImplicitConversion;
8434 ExprResult CurInitExprRes =
8435 S.PerformImplicitConversion(CurInit.get(), Step->Type, *Step->ICS,
8436 getAssignmentAction(Entity), CCK);
8437 if (CurInitExprRes.isInvalid())
8438 return ExprError();
8439
8440 S.DiscardMisalignedMemberAddress(Step->Type.getTypePtr(), CurInit.get());
8441
8442 CurInit = CurInitExprRes;
8443
8444 if (Step->Kind == SK_ConversionSequenceNoNarrowing &&
8445 S.getLangOpts().CPlusPlus)
8446 DiagnoseNarrowingInInitList(S, *Step->ICS, SourceType, Entity.getType(),
8447 CurInit.get());
8448
8449 break;
8450 }
8451
8452 case SK_ListInitialization: {
8453 if (checkAbstractType(Step->Type))
8454 return ExprError();
8455
8456 InitListExpr *InitList = cast<InitListExpr>(CurInit.get());
8457 // If we're not initializing the top-level entity, we need to create an
8458 // InitializeTemporary entity for our target type.
8459 QualType Ty = Step->Type;
8460 bool IsTemporary = !S.Context.hasSameType(Entity.getType(), Ty);
8461 InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(Ty);
8462 InitializedEntity InitEntity = IsTemporary ? TempEntity : Entity;
8463 InitListChecker PerformInitList(S, InitEntity,
8464 InitList, Ty, /*VerifyOnly=*/false,
8465 /*TreatUnavailableAsInvalid=*/false);
8466 if (PerformInitList.HadError())
8467 return ExprError();
8468
8469 // Hack: We must update *ResultType if available in order to set the
8470 // bounds of arrays, e.g. in 'int ar[] = {1, 2, 3};'.
8471 // Worst case: 'const int (&arref)[] = {1, 2, 3};'.
8472 if (ResultType &&
8473 ResultType->getNonReferenceType()->isIncompleteArrayType()) {
8474 if ((*ResultType)->isRValueReferenceType())
8475 Ty = S.Context.getRValueReferenceType(Ty);
8476 else if ((*ResultType)->isLValueReferenceType())
8477 Ty = S.Context.getLValueReferenceType(Ty,
8478 (*ResultType)->castAs<LValueReferenceType>()->isSpelledAsLValue());
8479 *ResultType = Ty;
8480 }
8481
8482 InitListExpr *StructuredInitList =
8483 PerformInitList.getFullyStructuredList();
8484 CurInit.get();
8485 CurInit = shouldBindAsTemporary(InitEntity)
8486 ? S.MaybeBindToTemporary(StructuredInitList)
8487 : StructuredInitList;
8488 break;
8489 }
8490
8491 case SK_ConstructorInitializationFromList: {
8492 if (checkAbstractType(Step->Type))
8493 return ExprError();
8494
8495 // When an initializer list is passed for a parameter of type "reference
8496 // to object", we don't get an EK_Temporary entity, but instead an
8497 // EK_Parameter entity with reference type.
8498 // FIXME: This is a hack. What we really should do is create a user
8499 // conversion step for this case, but this makes it considerably more
8500 // complicated. For now, this will do.
8501 InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(
8502 Entity.getType().getNonReferenceType());
8503 bool UseTemporary = Entity.getType()->isReferenceType();
8504 assert(Args.size() == 1 && "expected a single argument for list init")((void)0);
8505 InitListExpr *InitList = cast<InitListExpr>(Args[0]);
8506 S.Diag(InitList->getExprLoc(), diag::warn_cxx98_compat_ctor_list_init)
8507 << InitList->getSourceRange();
8508 MultiExprArg Arg(InitList->getInits(), InitList->getNumInits());
8509 CurInit = PerformConstructorInitialization(S, UseTemporary ? TempEntity :
8510 Entity,
8511 Kind, Arg, *Step,
8512 ConstructorInitRequiresZeroInit,
8513 /*IsListInitialization*/true,
8514 /*IsStdInitListInit*/false,
8515 InitList->getLBraceLoc(),
8516 InitList->getRBraceLoc());
8517 break;
8518 }
8519
8520 case SK_UnwrapInitList:
8521 CurInit = cast<InitListExpr>(CurInit.get())->getInit(0);
8522 break;
8523
8524 case SK_RewrapInitList: {
8525 Expr *E = CurInit.get();
8526 InitListExpr *Syntactic = Step->WrappingSyntacticList;
8527 InitListExpr *ILE = new (S.Context) InitListExpr(S.Context,
8528 Syntactic->getLBraceLoc(), E, Syntactic->getRBraceLoc());
8529 ILE->setSyntacticForm(Syntactic);
8530 ILE->setType(E->getType());
8531 ILE->setValueKind(E->getValueKind());
8532 CurInit = ILE;
8533 break;
8534 }
8535
8536 case SK_ConstructorInitialization:
8537 case SK_StdInitializerListConstructorCall: {
8538 if (checkAbstractType(Step->Type))
8539 return ExprError();
8540
8541 // When an initializer list is passed for a parameter of type "reference
8542 // to object", we don't get an EK_Temporary entity, but instead an
8543 // EK_Parameter entity with reference type.
8544 // FIXME: This is a hack. What we really should do is create a user
8545 // conversion step for this case, but this makes it considerably more
8546 // complicated. For now, this will do.
8547 InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(
8548 Entity.getType().getNonReferenceType());
8549 bool UseTemporary = Entity.getType()->isReferenceType();
8550 bool IsStdInitListInit =
8551 Step->Kind == SK_StdInitializerListConstructorCall;
8552 Expr *Source = CurInit.get();
8553 SourceRange Range = Kind.hasParenOrBraceRange()
8554 ? Kind.getParenOrBraceRange()
8555 : SourceRange();
8556 CurInit = PerformConstructorInitialization(
8557 S, UseTemporary ? TempEntity : Entity, Kind,
8558 Source ? MultiExprArg(Source) : Args, *Step,
8559 ConstructorInitRequiresZeroInit,
8560 /*IsListInitialization*/ IsStdInitListInit,
8561 /*IsStdInitListInitialization*/ IsStdInitListInit,
8562 /*LBraceLoc*/ Range.getBegin(),
8563 /*RBraceLoc*/ Range.getEnd());
8564 break;
8565 }
8566
8567 case SK_ZeroInitialization: {
8568 step_iterator NextStep = Step;
8569 ++NextStep;
8570 if (NextStep != StepEnd &&
8571 (NextStep->Kind == SK_ConstructorInitialization ||
8572 NextStep->Kind == SK_ConstructorInitializationFromList)) {
8573 // The need for zero-initialization is recorded directly into
8574 // the call to the object's constructor within the next step.
8575 ConstructorInitRequiresZeroInit = true;
8576 } else if (Kind.getKind() == InitializationKind::IK_Value &&
8577 S.getLangOpts().CPlusPlus &&
8578 !Kind.isImplicitValueInit()) {
8579 TypeSourceInfo *TSInfo = Entity.getTypeSourceInfo();
8580 if (!TSInfo)
8581 TSInfo = S.Context.getTrivialTypeSourceInfo(Step->Type,
8582 Kind.getRange().getBegin());
8583
8584 CurInit = new (S.Context) CXXScalarValueInitExpr(
8585 Entity.getType().getNonLValueExprType(S.Context), TSInfo,
8586 Kind.getRange().getEnd());
8587 } else {
8588 CurInit = new (S.Context) ImplicitValueInitExpr(Step->Type);
8589 }
8590 break;
8591 }
8592
8593 case SK_CAssignment: {
8594 QualType SourceType = CurInit.get()->getType();
8595
8596 // Save off the initial CurInit in case we need to emit a diagnostic
8597 ExprResult InitialCurInit = CurInit;
8598 ExprResult Result = CurInit;
8599 Sema::AssignConvertType ConvTy =
8600 S.CheckSingleAssignmentConstraints(Step->Type, Result, true,
8601 Entity.getKind() == InitializedEntity::EK_Parameter_CF_Audited);
8602 if (Result.isInvalid())
8603 return ExprError();
8604 CurInit = Result;
8605
8606 // If this is a call, allow conversion to a transparent union.
8607 ExprResult CurInitExprRes = CurInit;
8608 if (ConvTy != Sema::Compatible &&
8609 Entity.isParameterKind() &&
8610 S.CheckTransparentUnionArgumentConstraints(Step->Type, CurInitExprRes)
8611 == Sema::Compatible)
8612 ConvTy = Sema::Compatible;
8613 if (CurInitExprRes.isInvalid())
8614 return ExprError();
8615 CurInit = CurInitExprRes;
8616
8617 bool Complained;
8618 if (S.DiagnoseAssignmentResult(ConvTy, Kind.getLocation(),
8619 Step->Type, SourceType,
8620 InitialCurInit.get(),
8621 getAssignmentAction(Entity, true),
8622 &Complained)) {
8623 PrintInitLocationNote(S, Entity);
8624 return ExprError();
8625 } else if (Complained)
8626 PrintInitLocationNote(S, Entity);
8627 break;
8628 }
8629
8630 case SK_StringInit: {
8631 QualType Ty = Step->Type;
8632 bool UpdateType = ResultType && Entity.getType()->isIncompleteArrayType();
8633 CheckStringInit(CurInit.get(), UpdateType ? *ResultType : Ty,
8634 S.Context.getAsArrayType(Ty), S);
8635 break;
8636 }
8637
8638 case SK_ObjCObjectConversion:
8639 CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
8640 CK_ObjCObjectLValueCast,
8641 CurInit.get()->getValueKind());
8642 break;
8643
8644 case SK_ArrayLoopIndex: {
8645 Expr *Cur = CurInit.get();
8646 Expr *BaseExpr = new (S.Context)
8647 OpaqueValueExpr(Cur->getExprLoc(), Cur->getType(),
8648 Cur->getValueKind(), Cur->getObjectKind(), Cur);
8649 Expr *IndexExpr =
8650 new (S.Context) ArrayInitIndexExpr(S.Context.getSizeType());
8651 CurInit = S.CreateBuiltinArraySubscriptExpr(
8652 BaseExpr, Kind.getLocation(), IndexExpr, Kind.getLocation());
8653 ArrayLoopCommonExprs.push_back(BaseExpr);
8654 break;
8655 }
8656
8657 case SK_ArrayLoopInit: {
8658 assert(!ArrayLoopCommonExprs.empty() &&((void)0)
8659 "mismatched SK_ArrayLoopIndex and SK_ArrayLoopInit")((void)0);
8660 Expr *Common = ArrayLoopCommonExprs.pop_back_val();
8661 CurInit = new (S.Context) ArrayInitLoopExpr(Step->Type, Common,
8662 CurInit.get());
8663 break;
8664 }
8665
8666 case SK_GNUArrayInit:
8667 // Okay: we checked everything before creating this step. Note that
8668 // this is a GNU extension.
8669 S.Diag(Kind.getLocation(), diag::ext_array_init_copy)
8670 << Step->Type << CurInit.get()->getType()
8671 << CurInit.get()->getSourceRange();
8672 updateGNUCompoundLiteralRValue(CurInit.get());
8673 LLVM_FALLTHROUGH[[gnu::fallthrough]];
8674 case SK_ArrayInit:
8675 // If the destination type is an incomplete array type, update the
8676 // type accordingly.
8677 if (ResultType) {
8678 if (const IncompleteArrayType *IncompleteDest
8679 = S.Context.getAsIncompleteArrayType(Step->Type)) {
8680 if (const ConstantArrayType *ConstantSource
8681 = S.Context.getAsConstantArrayType(CurInit.get()->getType())) {
8682 *ResultType = S.Context.getConstantArrayType(
8683 IncompleteDest->getElementType(),
8684 ConstantSource->getSize(),
8685 ConstantSource->getSizeExpr(),
8686 ArrayType::Normal, 0);
8687 }
8688 }
8689 }
8690 break;
8691
8692 case SK_ParenthesizedArrayInit:
8693 // Okay: we checked everything before creating this step. Note that
8694 // this is a GNU extension.
8695 S.Diag(Kind.getLocation(), diag::ext_array_init_parens)
8696 << CurInit.get()->getSourceRange();
8697 break;
8698
8699 case SK_PassByIndirectCopyRestore:
8700 case SK_PassByIndirectRestore:
8701 checkIndirectCopyRestoreSource(S, CurInit.get());
8702 CurInit = new (S.Context) ObjCIndirectCopyRestoreExpr(
8703 CurInit.get(), Step->Type,
8704 Step->Kind == SK_PassByIndirectCopyRestore);
8705 break;
8706
8707 case SK_ProduceObjCObject:
8708 CurInit = ImplicitCastExpr::Create(
8709 S.Context, Step->Type, CK_ARCProduceObject, CurInit.get(), nullptr,
8710 VK_PRValue, FPOptionsOverride());
8711 break;
8712
8713 case SK_StdInitializerList: {
8714 S.Diag(CurInit.get()->getExprLoc(),
8715 diag::warn_cxx98_compat_initializer_list_init)
8716 << CurInit.get()->getSourceRange();
8717
8718 // Materialize the temporary into memory.
8719 MaterializeTemporaryExpr *MTE = S.CreateMaterializeTemporaryExpr(
8720 CurInit.get()->getType(), CurInit.get(),
8721 /*BoundToLvalueReference=*/false);
8722
8723 // Wrap it in a construction of a std::initializer_list<T>.
8724 CurInit = new (S.Context) CXXStdInitializerListExpr(Step->Type, MTE);
8725
8726 // Bind the result, in case the library has given initializer_list a
8727 // non-trivial destructor.
8728 if (shouldBindAsTemporary(Entity))
8729 CurInit = S.MaybeBindToTemporary(CurInit.get());
8730 break;
8731 }
8732
8733 case SK_OCLSamplerInit: {
8734 // Sampler initialization have 5 cases:
8735 // 1. function argument passing
8736 // 1a. argument is a file-scope variable
8737 // 1b. argument is a function-scope variable
8738 // 1c. argument is one of caller function's parameters
8739 // 2. variable initialization
8740 // 2a. initializing a file-scope variable
8741 // 2b. initializing a function-scope variable
8742 //
8743 // For file-scope variables, since they cannot be initialized by function
8744 // call of __translate_sampler_initializer in LLVM IR, their references
8745 // need to be replaced by a cast from their literal initializers to
8746 // sampler type. Since sampler variables can only be used in function
8747 // calls as arguments, we only need to replace them when handling the
8748 // argument passing.
8749 assert(Step->Type->isSamplerT() &&((void)0)
8750 "Sampler initialization on non-sampler type.")((void)0);
8751 Expr *Init = CurInit.get()->IgnoreParens();
8752 QualType SourceType = Init->getType();
8753 // Case 1
8754 if (Entity.isParameterKind()) {
8755 if (!SourceType->isSamplerT() && !SourceType->isIntegerType()) {
8756 S.Diag(Kind.getLocation(), diag::err_sampler_argument_required)
8757 << SourceType;
8758 break;
8759 } else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Init)) {
8760 auto Var = cast<VarDecl>(DRE->getDecl());
8761 // Case 1b and 1c
8762 // No cast from integer to sampler is needed.
8763 if (!Var->hasGlobalStorage()) {
8764 CurInit = ImplicitCastExpr::Create(
8765 S.Context, Step->Type, CK_LValueToRValue, Init,
8766 /*BasePath=*/nullptr, VK_PRValue, FPOptionsOverride());
8767 break;
8768 }
8769 // Case 1a
8770 // For function call with a file-scope sampler variable as argument,
8771 // get the integer literal.
8772 // Do not diagnose if the file-scope variable does not have initializer
8773 // since this has already been diagnosed when parsing the variable
8774 // declaration.
8775 if (!Var->getInit() || !isa<ImplicitCastExpr>(Var->getInit()))
8776 break;
8777 Init = cast<ImplicitCastExpr>(const_cast<Expr*>(
8778 Var->getInit()))->getSubExpr();
8779 SourceType = Init->getType();
8780 }
8781 } else {
8782 // Case 2
8783 // Check initializer is 32 bit integer constant.
8784 // If the initializer is taken from global variable, do not diagnose since
8785 // this has already been done when parsing the variable declaration.
8786 if (!Init->isConstantInitializer(S.Context, false))
8787 break;
8788
8789 if (!SourceType->isIntegerType() ||
8790 32 != S.Context.getIntWidth(SourceType)) {
8791 S.Diag(Kind.getLocation(), diag::err_sampler_initializer_not_integer)
8792 << SourceType;
8793 break;
8794 }
8795
8796 Expr::EvalResult EVResult;
8797 Init->EvaluateAsInt(EVResult, S.Context);
8798 llvm::APSInt Result = EVResult.Val.getInt();
8799 const uint64_t SamplerValue = Result.getLimitedValue();
8800 // 32-bit value of sampler's initializer is interpreted as
8801 // bit-field with the following structure:
8802 // |unspecified|Filter|Addressing Mode| Normalized Coords|
8803 // |31 6|5 4|3 1| 0|
8804 // This structure corresponds to enum values of sampler properties
8805 // defined in SPIR spec v1.2 and also opencl-c.h
8806 unsigned AddressingMode = (0x0E & SamplerValue) >> 1;
8807 unsigned FilterMode = (0x30 & SamplerValue) >> 4;
8808 if (FilterMode != 1 && FilterMode != 2 &&
8809 !S.getOpenCLOptions().isAvailableOption(
8810 "cl_intel_device_side_avc_motion_estimation", S.getLangOpts()))
8811 S.Diag(Kind.getLocation(),
8812 diag::warn_sampler_initializer_invalid_bits)
8813 << "Filter Mode";
8814 if (AddressingMode > 4)
8815 S.Diag(Kind.getLocation(),
8816 diag::warn_sampler_initializer_invalid_bits)
8817 << "Addressing Mode";
8818 }
8819
8820 // Cases 1a, 2a and 2b
8821 // Insert cast from integer to sampler.
8822 CurInit = S.ImpCastExprToType(Init, S.Context.OCLSamplerTy,
8823 CK_IntToOCLSampler);
8824 break;
8825 }
8826 case SK_OCLZeroOpaqueType: {
8827 assert((Step->Type->isEventT() || Step->Type->isQueueT() ||((void)0)
8828 Step->Type->isOCLIntelSubgroupAVCType()) &&((void)0)
8829 "Wrong type for initialization of OpenCL opaque type.")((void)0);
8830
8831 CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
8832 CK_ZeroToOCLOpaqueType,
8833 CurInit.get()->getValueKind());
8834 break;
8835 }
8836 }
8837 }
8838
8839 // Check whether the initializer has a shorter lifetime than the initialized
8840 // entity, and if not, either lifetime-extend or warn as appropriate.
8841 if (auto *Init = CurInit.get())
8842 S.checkInitializerLifetime(Entity, Init);
8843
8844 // Diagnose non-fatal problems with the completed initialization.
8845 if (Entity.getKind() == InitializedEntity::EK_Member &&
8846 cast<FieldDecl>(Entity.getDecl())->isBitField())
8847 S.CheckBitFieldInitialization(Kind.getLocation(),
8848 cast<FieldDecl>(Entity.getDecl()),
8849 CurInit.get());
8850
8851 // Check for std::move on construction.
8852 if (const Expr *E = CurInit.get()) {
8853 CheckMoveOnConstruction(S, E,
8854 Entity.getKind() == InitializedEntity::EK_Result);
8855 }
8856
8857 return CurInit;
8858}
8859
8860/// Somewhere within T there is an uninitialized reference subobject.
8861/// Dig it out and diagnose it.
8862static bool DiagnoseUninitializedReference(Sema &S, SourceLocation Loc,
8863 QualType T) {
8864 if (T->isReferenceType()) {
8865 S.Diag(Loc, diag::err_reference_without_init)
8866 << T.getNonReferenceType();
8867 return true;
8868 }
8869
8870 CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
8871 if (!RD || !RD->hasUninitializedReferenceMember())
8872 return false;
8873
8874 for (const auto *FI : RD->fields()) {
8875 if (FI->isUnnamedBitfield())
8876 continue;
8877
8878 if (DiagnoseUninitializedReference(S, FI->getLocation(), FI->getType())) {
8879 S.Diag(Loc, diag::note_value_initialization_here) << RD;
8880 return true;
8881 }
8882 }
8883
8884 for (const auto &BI : RD->bases()) {
8885 if (DiagnoseUninitializedReference(S, BI.getBeginLoc(), BI.getType())) {
8886 S.Diag(Loc, diag::note_value_initialization_here) << RD;
8887 return true;
8888 }
8889 }
8890
8891 return false;
8892}
8893
8894
8895//===----------------------------------------------------------------------===//
8896// Diagnose initialization failures
8897//===----------------------------------------------------------------------===//
8898
8899/// Emit notes associated with an initialization that failed due to a
8900/// "simple" conversion failure.
8901static void emitBadConversionNotes(Sema &S, const InitializedEntity &entity,
8902 Expr *op) {
8903 QualType destType = entity.getType();
8904 if (destType.getNonReferenceType()->isObjCObjectPointerType() &&
8905 op->getType()->isObjCObjectPointerType()) {
8906
8907 // Emit a possible note about the conversion failing because the
8908 // operand is a message send with a related result type.
8909 S.EmitRelatedResultTypeNote(op);
8910
8911 // Emit a possible note about a return failing because we're
8912 // expecting a related result type.
8913 if (entity.getKind() == InitializedEntity::EK_Result)
8914 S.EmitRelatedResultTypeNoteForReturn(destType);
8915 }
8916 QualType fromType = op->getType();
8917 auto *fromDecl = fromType.getTypePtr()->getPointeeCXXRecordDecl();
8918 auto *destDecl = destType.getTypePtr()->getPointeeCXXRecordDecl();
8919 if (fromDecl && destDecl && fromDecl->getDeclKind() == Decl::CXXRecord &&
8920 destDecl->getDeclKind() == Decl::CXXRecord &&
8921 !fromDecl->isInvalidDecl() && !destDecl->isInvalidDecl() &&
8922 !fromDecl->hasDefinition())
8923 S.Diag(fromDecl->getLocation(), diag::note_forward_class_conversion)
8924 << S.getASTContext().getTagDeclType(fromDecl)
8925 << S.getASTContext().getTagDeclType(destDecl);
8926}
8927
8928static void diagnoseListInit(Sema &S, const InitializedEntity &Entity,
8929 InitListExpr *InitList) {
8930 QualType DestType = Entity.getType();
8931
8932 QualType E;
8933 if (S.getLangOpts().CPlusPlus11 && S.isStdInitializerList(DestType, &E)) {
8934 QualType ArrayType = S.Context.getConstantArrayType(
8935 E.withConst(),
8936 llvm::APInt(S.Context.getTypeSize(S.Context.getSizeType()),
8937 InitList->getNumInits()),
8938 nullptr, clang::ArrayType::Normal, 0);
8939 InitializedEntity HiddenArray =
8940 InitializedEntity::InitializeTemporary(ArrayType);
8941 return diagnoseListInit(S, HiddenArray, InitList);
8942 }
8943
8944 if (DestType->isReferenceType()) {
8945 // A list-initialization failure for a reference means that we tried to
8946 // create a temporary of the inner type (per [dcl.init.list]p3.6) and the
8947 // inner initialization failed.
8948 QualType T = DestType->castAs<ReferenceType>()->getPointeeType();
8949 diagnoseListInit(S, InitializedEntity::InitializeTemporary(T), InitList);
8950 SourceLocation Loc = InitList->getBeginLoc();
8951 if (auto *D = Entity.getDecl())
8952 Loc = D->getLocation();
8953 S.Diag(Loc, diag::note_in_reference_temporary_list_initializer) << T;
8954 return;
8955 }
8956
8957 InitListChecker DiagnoseInitList(S, Entity, InitList, DestType,
8958 /*VerifyOnly=*/false,
8959 /*TreatUnavailableAsInvalid=*/false);
8960 assert(DiagnoseInitList.HadError() &&((void)0)
8961 "Inconsistent init list check result.")((void)0);
8962}
8963
8964bool InitializationSequence::Diagnose(Sema &S,
8965 const InitializedEntity &Entity,
8966 const InitializationKind &Kind,
8967 ArrayRef<Expr *> Args) {
8968 if (!Failed())
8969 return false;
8970
8971 // When we want to diagnose only one element of a braced-init-list,
8972 // we need to factor it out.
8973 Expr *OnlyArg;
8974 if (Args.size() == 1) {
8975 auto *List = dyn_cast<InitListExpr>(Args[0]);
8976 if (List && List->getNumInits() == 1)
8977 OnlyArg = List->getInit(0);
8978 else
8979 OnlyArg = Args[0];
8980 }
8981 else
8982 OnlyArg = nullptr;
8983
8984 QualType DestType = Entity.getType();
8985 switch (Failure) {
8986 case FK_TooManyInitsForReference:
8987 // FIXME: Customize for the initialized entity?
8988 if (Args.empty()) {
8989 // Dig out the reference subobject which is uninitialized and diagnose it.
8990 // If this is value-initialization, this could be nested some way within
8991 // the target type.
8992 assert(Kind.getKind() == InitializationKind::IK_Value ||((void)0)
8993 DestType->isReferenceType())((void)0);
8994 bool Diagnosed =
8995 DiagnoseUninitializedReference(S, Kind.getLocation(), DestType);
8996 assert(Diagnosed && "couldn't find uninitialized reference to diagnose")((void)0);
8997 (void)Diagnosed;
8998 } else // FIXME: diagnostic below could be better!
8999 S.Diag(Kind.getLocation(), diag::err_reference_has_multiple_inits)
9000 << SourceRange(Args.front()->getBeginLoc(), Args.back()->getEndLoc());
9001 break;
9002 case FK_ParenthesizedListInitForReference:
9003 S.Diag(Kind.getLocation(), diag::err_list_init_in_parens)
9004 << 1 << Entity.getType() << Args[0]->getSourceRange();
9005 break;
9006
9007 case FK_ArrayNeedsInitList:
9008 S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 0;
9009 break;
9010 case FK_ArrayNeedsInitListOrStringLiteral:
9011 S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 1;
9012 break;
9013 case FK_ArrayNeedsInitListOrWideStringLiteral:
9014 S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 2;
9015 break;
9016 case FK_NarrowStringIntoWideCharArray:
9017 S.Diag(Kind.getLocation(), diag::err_array_init_narrow_string_into_wchar);
9018 break;
9019 case FK_WideStringIntoCharArray:
9020 S.Diag(Kind.getLocation(), diag::err_array_init_wide_string_into_char);
9021 break;
9022 case FK_IncompatWideStringIntoWideChar:
9023 S.Diag(Kind.getLocation(),
9024 diag::err_array_init_incompat_wide_string_into_wchar);
9025 break;
9026 case FK_PlainStringIntoUTF8Char:
9027 S.Diag(Kind.getLocation(),
9028 diag::err_array_init_plain_string_into_char8_t);
9029 S.Diag(Args.front()->getBeginLoc(),
9030 diag::note_array_init_plain_string_into_char8_t)
9031 << FixItHint::CreateInsertion(Args.front()->getBeginLoc(), "u8");
9032 break;
9033 case FK_UTF8StringIntoPlainChar:
9034 S.Diag(Kind.getLocation(),
9035 diag::err_array_init_utf8_string_into_char)
9036 << S.getLangOpts().CPlusPlus20;
9037 break;
9038 case FK_ArrayTypeMismatch:
9039 case FK_NonConstantArrayInit:
9040 S.Diag(Kind.getLocation(),
9041 (Failure == FK_ArrayTypeMismatch
9042 ? diag::err_array_init_different_type
9043 : diag::err_array_init_non_constant_array))
9044 << DestType.getNonReferenceType()
9045 << OnlyArg->getType()
9046 << Args[0]->getSourceRange();
9047 break;
9048
9049 case FK_VariableLengthArrayHasInitializer:
9050 S.Diag(Kind.getLocation(), diag::err_variable_object_no_init)
9051 << Args[0]->getSourceRange();
9052 break;
9053
9054 case FK_AddressOfOverloadFailed: {
9055 DeclAccessPair Found;
9056 S.ResolveAddressOfOverloadedFunction(OnlyArg,
9057 DestType.getNonReferenceType(),
9058 true,
9059 Found);
9060 break;
9061 }
9062
9063 case FK_AddressOfUnaddressableFunction: {
9064 auto *FD = cast<FunctionDecl>(cast<DeclRefExpr>(OnlyArg)->getDecl());
9065 S.checkAddressOfFunctionIsAvailable(FD, /*Complain=*/true,
9066 OnlyArg->getBeginLoc());
9067 break;
9068 }
9069
9070 case FK_ReferenceInitOverloadFailed:
9071 case FK_UserConversionOverloadFailed:
9072 switch (FailedOverloadResult) {
9073 case OR_Ambiguous:
9074
9075 FailedCandidateSet.NoteCandidates(
9076 PartialDiagnosticAt(
9077 Kind.getLocation(),
9078 Failure == FK_UserConversionOverloadFailed
9079 ? (S.PDiag(diag::err_typecheck_ambiguous_condition)
9080 << OnlyArg->getType() << DestType
9081 << Args[0]->getSourceRange())
9082 : (S.PDiag(diag::err_ref_init_ambiguous)
9083 << DestType << OnlyArg->getType()
9084 << Args[0]->getSourceRange())),
9085 S, OCD_AmbiguousCandidates, Args);
9086 break;
9087
9088 case OR_No_Viable_Function: {
9089 auto Cands = FailedCandidateSet.CompleteCandidates(S, OCD_AllCandidates, Args);
9090 if (!S.RequireCompleteType(Kind.getLocation(),
9091 DestType.getNonReferenceType(),
9092 diag::err_typecheck_nonviable_condition_incomplete,
9093 OnlyArg->getType(), Args[0]->getSourceRange()))
9094 S.Diag(Kind.getLocation(), diag::err_typecheck_nonviable_condition)
9095 << (Entity.getKind() == InitializedEntity::EK_Result)
9096 << OnlyArg->getType() << Args[0]->getSourceRange()
9097 << DestType.getNonReferenceType();
9098
9099 FailedCandidateSet.NoteCandidates(S, Args, Cands);
9100 break;
9101 }
9102 case OR_Deleted: {
9103 S.Diag(Kind.getLocation(), diag::err_typecheck_deleted_function)
9104 << OnlyArg->getType() << DestType.getNonReferenceType()
9105 << Args[0]->getSourceRange();
9106 OverloadCandidateSet::iterator Best;
9107 OverloadingResult Ovl
9108 = FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best);
9109 if (Ovl == OR_Deleted) {
9110 S.NoteDeletedFunction(Best->Function);
9111 } else {
9112 llvm_unreachable("Inconsistent overload resolution?")__builtin_unreachable();
9113 }
9114 break;
9115 }
9116
9117 case OR_Success:
9118 llvm_unreachable("Conversion did not fail!")__builtin_unreachable();
9119 }
9120 break;
9121
9122 case FK_NonConstLValueReferenceBindingToTemporary:
9123 if (isa<InitListExpr>(Args[0])) {
9124 S.Diag(Kind.getLocation(),
9125 diag::err_lvalue_reference_bind_to_initlist)
9126 << DestType.getNonReferenceType().isVolatileQualified()
9127 << DestType.getNonReferenceType()
9128 << Args[0]->getSourceRange();
9129 break;
9130 }
9131 LLVM_FALLTHROUGH[[gnu::fallthrough]];
9132
9133 case FK_NonConstLValueReferenceBindingToUnrelated:
9134 S.Diag(Kind.getLocation(),
9135 Failure == FK_NonConstLValueReferenceBindingToTemporary
9136 ? diag::err_lvalue_reference_bind_to_temporary
9137 : diag::err_lvalue_reference_bind_to_unrelated)
9138 << DestType.getNonReferenceType().isVolatileQualified()
9139 << DestType.getNonReferenceType()
9140 << OnlyArg->getType()
9141 << Args[0]->getSourceRange();
9142 break;
9143
9144 case FK_NonConstLValueReferenceBindingToBitfield: {
9145 // We don't necessarily have an unambiguous source bit-field.
9146 FieldDecl *BitField = Args[0]->getSourceBitField();
9147 S.Diag(Kind.getLocation(), diag::err_reference_bind_to_bitfield)
9148 << DestType.isVolatileQualified()
9149 << (BitField ? BitField->getDeclName() : DeclarationName())
9150 << (BitField != nullptr)
9151 << Args[0]->getSourceRange();
9152 if (BitField)
9153 S.Diag(BitField->getLocation(), diag::note_bitfield_decl);
9154 break;
9155 }
9156
9157 case FK_NonConstLValueReferenceBindingToVectorElement:
9158 S.Diag(Kind.getLocation(), diag::err_reference_bind_to_vector_element)
9159 << DestType.isVolatileQualified()
9160 << Args[0]->getSourceRange();
9161 break;
9162
9163 case FK_NonConstLValueReferenceBindingToMatrixElement:
9164 S.Diag(Kind.getLocation(), diag::err_reference_bind_to_matrix_element)
9165 << DestType.isVolatileQualified() << Args[0]->getSourceRange();
9166 break;
9167
9168 case FK_RValueReferenceBindingToLValue:
9169 S.Diag(Kind.getLocation(), diag::err_lvalue_to_rvalue_ref)
9170 << DestType.getNonReferenceType() << OnlyArg->getType()
9171 << Args[0]->getSourceRange();
9172 break;
9173
9174 case FK_ReferenceAddrspaceMismatchTemporary:
9175 S.Diag(Kind.getLocation(), diag::err_reference_bind_temporary_addrspace)
9176 << DestType << Args[0]->getSourceRange();
9177 break;
9178
9179 case FK_ReferenceInitDropsQualifiers: {
9180 QualType SourceType = OnlyArg->getType();
9181 QualType NonRefType = DestType.getNonReferenceType();
9182 Qualifiers DroppedQualifiers =
9183 SourceType.getQualifiers() - NonRefType.getQualifiers();
9184
9185 if (!NonRefType.getQualifiers().isAddressSpaceSupersetOf(
9186 SourceType.getQualifiers()))
9187 S.Diag(Kind.getLocation(), diag::err_reference_bind_drops_quals)
9188 << NonRefType << SourceType << 1 /*addr space*/
9189 << Args[0]->getSourceRange();
9190 else if (DroppedQualifiers.hasQualifiers())
9191 S.Diag(Kind.getLocation(), diag::err_reference_bind_drops_quals)
9192 << NonRefType << SourceType << 0 /*cv quals*/
9193 << Qualifiers::fromCVRMask(DroppedQualifiers.getCVRQualifiers())
9194 << DroppedQualifiers.getCVRQualifiers() << Args[0]->getSourceRange();
9195 else
9196 // FIXME: Consider decomposing the type and explaining which qualifiers
9197 // were dropped where, or on which level a 'const' is missing, etc.
9198 S.Diag(Kind.getLocation(), diag::err_reference_bind_drops_quals)
9199 << NonRefType << SourceType << 2 /*incompatible quals*/
9200 << Args[0]->getSourceRange();
9201 break;
9202 }
9203
9204 case FK_ReferenceInitFailed:
9205 S.Diag(Kind.getLocation(), diag::err_reference_bind_failed)
9206 << DestType.getNonReferenceType()
9207 << DestType.getNonReferenceType()->isIncompleteType()
9208 << OnlyArg->isLValue()
9209 << OnlyArg->getType()
9210 << Args[0]->getSourceRange();
9211 emitBadConversionNotes(S, Entity, Args[0]);
9212 break;
9213
9214 case FK_ConversionFailed: {
9215 QualType FromType = OnlyArg->getType();
9216 PartialDiagnostic PDiag = S.PDiag(diag::err_init_conversion_failed)
9217 << (int)Entity.getKind()
9218 << DestType
9219 << OnlyArg->isLValue()
9220 << FromType
9221 << Args[0]->getSourceRange();
9222 S.HandleFunctionTypeMismatch(PDiag, FromType, DestType);
9223 S.Diag(Kind.getLocation(), PDiag);
9224 emitBadConversionNotes(S, Entity, Args[0]);
9225 break;
9226 }
9227
9228 case FK_ConversionFromPropertyFailed:
9229 // No-op. This error has already been reported.
9230 break;
9231
9232 case FK_TooManyInitsForScalar: {
9233 SourceRange R;
9234
9235 auto *InitList = dyn_cast<InitListExpr>(Args[0]);
9236 if (InitList && InitList->getNumInits() >= 1) {
9237 R = SourceRange(InitList->getInit(0)->getEndLoc(), InitList->getEndLoc());
9238 } else {
9239 assert(Args.size() > 1 && "Expected multiple initializers!")((void)0);
9240 R = SourceRange(Args.front()->getEndLoc(), Args.back()->getEndLoc());
9241 }
9242
9243 R.setBegin(S.getLocForEndOfToken(R.getBegin()));
9244 if (Kind.isCStyleOrFunctionalCast())
9245 S.Diag(Kind.getLocation(), diag::err_builtin_func_cast_more_than_one_arg)
9246 << R;
9247 else
9248 S.Diag(Kind.getLocation(), diag::err_excess_initializers)
9249 << /*scalar=*/2 << R;
9250 break;
9251 }
9252
9253 case FK_ParenthesizedListInitForScalar:
9254 S.Diag(Kind.getLocation(), diag::err_list_init_in_parens)
9255 << 0 << Entity.getType() << Args[0]->getSourceRange();
9256 break;
9257
9258 case FK_ReferenceBindingToInitList:
9259 S.Diag(Kind.getLocation(), diag::err_reference_bind_init_list)
9260 << DestType.getNonReferenceType() << Args[0]->getSourceRange();
9261 break;
9262
9263 case FK_InitListBadDestinationType:
9264 S.Diag(Kind.getLocation(), diag::err_init_list_bad_dest_type)
9265 << (DestType->isRecordType()) << DestType << Args[0]->getSourceRange();
9266 break;
9267
9268 case FK_ListConstructorOverloadFailed:
9269 case FK_ConstructorOverloadFailed: {
9270 SourceRange ArgsRange;
9271 if (Args.size())
9272 ArgsRange =
9273 SourceRange(Args.front()->getBeginLoc(), Args.back()->getEndLoc());
9274
9275 if (Failure == FK_ListConstructorOverloadFailed) {
9276 assert(Args.size() == 1 &&((void)0)
9277 "List construction from other than 1 argument.")((void)0);
9278 InitListExpr *InitList = cast<InitListExpr>(Args[0]);
9279 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits());
9280 }
9281
9282 // FIXME: Using "DestType" for the entity we're printing is probably
9283 // bad.
9284 switch (FailedOverloadResult) {
9285 case OR_Ambiguous:
9286 FailedCandidateSet.NoteCandidates(
9287 PartialDiagnosticAt(Kind.getLocation(),
9288 S.PDiag(diag::err_ovl_ambiguous_init)
9289 << DestType << ArgsRange),
9290 S, OCD_AmbiguousCandidates, Args);
9291 break;
9292
9293 case OR_No_Viable_Function:
9294 if (Kind.getKind() == InitializationKind::IK_Default &&
9295 (Entity.getKind() == InitializedEntity::EK_Base ||
9296 Entity.getKind() == InitializedEntity::EK_Member) &&
9297 isa<CXXConstructorDecl>(S.CurContext)) {
9298 // This is implicit default initialization of a member or
9299 // base within a constructor. If no viable function was
9300 // found, notify the user that they need to explicitly
9301 // initialize this base/member.
9302 CXXConstructorDecl *Constructor
9303 = cast<CXXConstructorDecl>(S.CurContext);
9304 const CXXRecordDecl *InheritedFrom = nullptr;
9305 if (auto Inherited = Constructor->getInheritedConstructor())
9306 InheritedFrom = Inherited.getShadowDecl()->getNominatedBaseClass();
9307 if (Entity.getKind() == InitializedEntity::EK_Base) {
9308 S.Diag(Kind.getLocation(), diag::err_missing_default_ctor)
9309 << (InheritedFrom ? 2 : Constructor->isImplicit() ? 1 : 0)
9310 << S.Context.getTypeDeclType(Constructor->getParent())
9311 << /*base=*/0
9312 << Entity.getType()
9313 << InheritedFrom;
9314
9315 RecordDecl *BaseDecl
9316 = Entity.getBaseSpecifier()->getType()->castAs<RecordType>()
9317 ->getDecl();
9318 S.Diag(BaseDecl->getLocation(), diag::note_previous_decl)
9319 << S.Context.getTagDeclType(BaseDecl);
9320 } else {
9321 S.Diag(Kind.getLocation(), diag::err_missing_default_ctor)
9322 << (InheritedFrom ? 2 : Constructor->isImplicit() ? 1 : 0)
9323 << S.Context.getTypeDeclType(Constructor->getParent())
9324 << /*member=*/1
9325 << Entity.getName()
9326 << InheritedFrom;
9327 S.Diag(Entity.getDecl()->getLocation(),
9328 diag::note_member_declared_at);
9329
9330 if (const RecordType *Record
9331 = Entity.getType()->getAs<RecordType>())
9332 S.Diag(Record->getDecl()->getLocation(),
9333 diag::note_previous_decl)
9334 << S.Context.getTagDeclType(Record->getDecl());
9335 }
9336 break;
9337 }
9338
9339 FailedCandidateSet.NoteCandidates(
9340 PartialDiagnosticAt(
9341 Kind.getLocation(),
9342 S.PDiag(diag::err_ovl_no_viable_function_in_init)
9343 << DestType << ArgsRange),
9344 S, OCD_AllCandidates, Args);
9345 break;
9346
9347 case OR_Deleted: {
9348 OverloadCandidateSet::iterator Best;
9349 OverloadingResult Ovl
9350 = FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best);
9351 if (Ovl != OR_Deleted) {
9352 S.Diag(Kind.getLocation(), diag::err_ovl_deleted_init)
9353 << DestType << ArgsRange;
9354 llvm_unreachable("Inconsistent overload resolution?")__builtin_unreachable();
9355 break;
9356 }
9357
9358 // If this is a defaulted or implicitly-declared function, then
9359 // it was implicitly deleted. Make it clear that the deletion was
9360 // implicit.
9361 if (S.isImplicitlyDeleted(Best->Function))
9362 S.Diag(Kind.getLocation(), diag::err_ovl_deleted_special_init)
9363 << S.getSpecialMember(cast<CXXMethodDecl>(Best->Function))
9364 << DestType << ArgsRange;
9365 else
9366 S.Diag(Kind.getLocation(), diag::err_ovl_deleted_init)
9367 << DestType << ArgsRange;
9368
9369 S.NoteDeletedFunction(Best->Function);
9370 break;
9371 }
9372
9373 case OR_Success:
9374 llvm_unreachable("Conversion did not fail!")__builtin_unreachable();
9375 }
9376 }
9377 break;
9378
9379 case FK_DefaultInitOfConst:
9380 if (Entity.getKind() == InitializedEntity::EK_Member &&
9381 isa<CXXConstructorDecl>(S.CurContext)) {
9382 // This is implicit default-initialization of a const member in
9383 // a constructor. Complain that it needs to be explicitly
9384 // initialized.
9385 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(S.CurContext);
9386 S.Diag(Kind.getLocation(), diag::err_uninitialized_member_in_ctor)
9387 << (Constructor->getInheritedConstructor() ? 2 :
9388 Constructor->isImplicit() ? 1 : 0)
9389 << S.Context.getTypeDeclType(Constructor->getParent())
9390 << /*const=*/1
9391 << Entity.getName();
9392 S.Diag(Entity.getDecl()->getLocation(), diag::note_previous_decl)
9393 << Entity.getName();
9394 } else {
9395 S.Diag(Kind.getLocation(), diag::err_default_init_const)
9396 << DestType << (bool)DestType->getAs<RecordType>();
9397 }
9398 break;
9399
9400 case FK_Incomplete:
9401 S.RequireCompleteType(Kind.getLocation(), FailedIncompleteType,
9402 diag::err_init_incomplete_type);
9403 break;
9404
9405 case FK_ListInitializationFailed: {
9406 // Run the init list checker again to emit diagnostics.
9407 InitListExpr *InitList = cast<InitListExpr>(Args[0]);
9408 diagnoseListInit(S, Entity, InitList);
9409 break;
9410 }
9411
9412 case FK_PlaceholderType: {
9413 // FIXME: Already diagnosed!
9414 break;
9415 }
9416
9417 case FK_ExplicitConstructor: {
9418 S.Diag(Kind.getLocation(), diag::err_selected_explicit_constructor)
9419 << Args[0]->getSourceRange();
9420 OverloadCandidateSet::iterator Best;
9421 OverloadingResult Ovl
9422 = FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best);
9423 (void)Ovl;
9424 assert(Ovl == OR_Success && "Inconsistent overload resolution")((void)0);
9425 CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
9426 S.Diag(CtorDecl->getLocation(),
9427 diag::note_explicit_ctor_deduction_guide_here) << false;
9428 break;
9429 }
9430 }
9431
9432 PrintInitLocationNote(S, Entity);
9433 return true;
9434}
9435
9436void InitializationSequence::dump(raw_ostream &OS) const {
9437 switch (SequenceKind) {
9438 case FailedSequence: {
9439 OS << "Failed sequence: ";
9440 switch (Failure) {
9441 case FK_TooManyInitsForReference:
9442 OS << "too many initializers for reference";
9443 break;
9444
9445 case FK_ParenthesizedListInitForReference:
9446 OS << "parenthesized list init for reference";
9447 break;
9448
9449 case FK_ArrayNeedsInitList:
9450 OS << "array requires initializer list";
9451 break;
9452
9453 case FK_AddressOfUnaddressableFunction:
9454 OS << "address of unaddressable function was taken";
9455 break;
9456
9457 case FK_ArrayNeedsInitListOrStringLiteral:
9458 OS << "array requires initializer list or string literal";
9459 break;
9460
9461 case FK_ArrayNeedsInitListOrWideStringLiteral:
9462 OS << "array requires initializer list or wide string literal";
9463 break;
9464
9465 case FK_NarrowStringIntoWideCharArray:
9466 OS << "narrow string into wide char array";
9467 break;
9468
9469 case FK_WideStringIntoCharArray:
9470 OS << "wide string into char array";
9471 break;
9472
9473 case FK_IncompatWideStringIntoWideChar:
9474 OS << "incompatible wide string into wide char array";
9475 break;
9476
9477 case FK_PlainStringIntoUTF8Char:
9478 OS << "plain string literal into char8_t array";
9479 break;
9480
9481 case FK_UTF8StringIntoPlainChar:
9482 OS << "u8 string literal into char array";
9483 break;
9484
9485 case FK_ArrayTypeMismatch:
9486 OS << "array type mismatch";
9487 break;
9488
9489 case FK_NonConstantArrayInit:
9490 OS << "non-constant array initializer";
9491 break;
9492
9493 case FK_AddressOfOverloadFailed:
9494 OS << "address of overloaded function failed";
9495 break;
9496
9497 case FK_ReferenceInitOverloadFailed:
9498 OS << "overload resolution for reference initialization failed";
9499 break;
9500
9501 case FK_NonConstLValueReferenceBindingToTemporary:
9502 OS << "non-const lvalue reference bound to temporary";
9503 break;
9504
9505 case FK_NonConstLValueReferenceBindingToBitfield:
9506 OS << "non-const lvalue reference bound to bit-field";
9507 break;
9508
9509 case FK_NonConstLValueReferenceBindingToVectorElement:
9510 OS << "non-const lvalue reference bound to vector element";
9511 break;
9512
9513 case FK_NonConstLValueReferenceBindingToMatrixElement:
9514 OS << "non-const lvalue reference bound to matrix element";
9515 break;
9516
9517 case FK_NonConstLValueReferenceBindingToUnrelated:
9518 OS << "non-const lvalue reference bound to unrelated type";
9519 break;
9520
9521 case FK_RValueReferenceBindingToLValue:
9522 OS << "rvalue reference bound to an lvalue";
9523 break;
9524
9525 case FK_ReferenceInitDropsQualifiers:
9526 OS << "reference initialization drops qualifiers";
9527 break;
9528
9529 case FK_ReferenceAddrspaceMismatchTemporary:
9530 OS << "reference with mismatching address space bound to temporary";
9531 break;
9532
9533 case FK_ReferenceInitFailed:
9534 OS << "reference initialization failed";
9535 break;
9536
9537 case FK_ConversionFailed:
9538 OS << "conversion failed";
9539 break;
9540
9541 case FK_ConversionFromPropertyFailed:
9542 OS << "conversion from property failed";
9543 break;
9544
9545 case FK_TooManyInitsForScalar:
9546 OS << "too many initializers for scalar";
9547 break;
9548
9549 case FK_ParenthesizedListInitForScalar:
9550 OS << "parenthesized list init for reference";
9551 break;
9552
9553 case FK_ReferenceBindingToInitList:
9554 OS << "referencing binding to initializer list";
9555 break;
9556
9557 case FK_InitListBadDestinationType:
9558 OS << "initializer list for non-aggregate, non-scalar type";
9559 break;
9560
9561 case FK_UserConversionOverloadFailed:
9562 OS << "overloading failed for user-defined conversion";
9563 break;
9564
9565 case FK_ConstructorOverloadFailed:
9566 OS << "constructor overloading failed";
9567 break;
9568
9569 case FK_DefaultInitOfConst:
9570 OS << "default initialization of a const variable";
9571 break;
9572
9573 case FK_Incomplete:
9574 OS << "initialization of incomplete type";
9575 break;
9576
9577 case FK_ListInitializationFailed:
9578 OS << "list initialization checker failure";
9579 break;
9580
9581 case FK_VariableLengthArrayHasInitializer:
9582 OS << "variable length array has an initializer";
9583 break;
9584
9585 case FK_PlaceholderType:
9586 OS << "initializer expression isn't contextually valid";
9587 break;
9588
9589 case FK_ListConstructorOverloadFailed:
9590 OS << "list constructor overloading failed";
9591 break;
9592
9593 case FK_ExplicitConstructor:
9594 OS << "list copy initialization chose explicit constructor";
9595 break;
9596 }
9597 OS << '\n';
9598 return;
9599 }
9600
9601 case DependentSequence:
9602 OS << "Dependent sequence\n";
9603 return;
9604
9605 case NormalSequence:
9606 OS << "Normal sequence: ";
9607 break;
9608 }
9609
9610 for (step_iterator S = step_begin(), SEnd = step_end(); S != SEnd; ++S) {
9611 if (S != step_begin()) {
9612 OS << " -> ";
9613 }
9614
9615 switch (S->Kind) {
9616 case SK_ResolveAddressOfOverloadedFunction:
9617 OS << "resolve address of overloaded function";
9618 break;
9619
9620 case SK_CastDerivedToBasePRValue:
9621 OS << "derived-to-base (prvalue)";
9622 break;
9623
9624 case SK_CastDerivedToBaseXValue:
9625 OS << "derived-to-base (xvalue)";
9626 break;
9627
9628 case SK_CastDerivedToBaseLValue:
9629 OS << "derived-to-base (lvalue)";
9630 break;
9631
9632 case SK_BindReference:
9633 OS << "bind reference to lvalue";
9634 break;
9635
9636 case SK_BindReferenceToTemporary:
9637 OS << "bind reference to a temporary";
9638 break;
9639
9640 case SK_FinalCopy:
9641 OS << "final copy in class direct-initialization";
9642 break;
9643
9644 case SK_ExtraneousCopyToTemporary:
9645 OS << "extraneous C++03 copy to temporary";
9646 break;
9647
9648 case SK_UserConversion:
9649 OS << "user-defined conversion via " << *S->Function.Function;
9650 break;
9651
9652 case SK_QualificationConversionPRValue:
9653 OS << "qualification conversion (prvalue)";
9654 break;
9655
9656 case SK_QualificationConversionXValue:
9657 OS << "qualification conversion (xvalue)";
9658 break;
9659
9660 case SK_QualificationConversionLValue:
9661 OS << "qualification conversion (lvalue)";
9662 break;
9663
9664 case SK_FunctionReferenceConversion:
9665 OS << "function reference conversion";
9666 break;
9667
9668 case SK_AtomicConversion:
9669 OS << "non-atomic-to-atomic conversion";
9670 break;
9671
9672 case SK_ConversionSequence:
9673 OS << "implicit conversion sequence (";
9674 S->ICS->dump(); // FIXME: use OS
9675 OS << ")";
9676 break;
9677
9678 case SK_ConversionSequenceNoNarrowing:
9679 OS << "implicit conversion sequence with narrowing prohibited (";
9680 S->ICS->dump(); // FIXME: use OS
9681 OS << ")";
9682 break;
9683
9684 case SK_ListInitialization:
9685 OS << "list aggregate initialization";
9686 break;
9687
9688 case SK_UnwrapInitList:
9689 OS << "unwrap reference initializer list";
9690 break;
9691
9692 case SK_RewrapInitList:
9693 OS << "rewrap reference initializer list";
9694 break;
9695
9696 case SK_ConstructorInitialization:
9697 OS << "constructor initialization";
9698 break;
9699
9700 case SK_ConstructorInitializationFromList:
9701 OS << "list initialization via constructor";
9702 break;
9703
9704 case SK_ZeroInitialization:
9705 OS << "zero initialization";
9706 break;
9707
9708 case SK_CAssignment:
9709 OS << "C assignment";
9710 break;
9711
9712 case SK_StringInit:
9713 OS << "string initialization";
9714 break;
9715
9716 case SK_ObjCObjectConversion:
9717 OS << "Objective-C object conversion";
9718 break;
9719
9720 case SK_ArrayLoopIndex:
9721 OS << "indexing for array initialization loop";
9722 break;
9723
9724 case SK_ArrayLoopInit:
9725 OS << "array initialization loop";
9726 break;
9727
9728 case SK_ArrayInit:
9729 OS << "array initialization";
9730 break;
9731
9732 case SK_GNUArrayInit:
9733 OS << "array initialization (GNU extension)";
9734 break;
9735
9736 case SK_ParenthesizedArrayInit:
9737 OS << "parenthesized array initialization";
9738 break;
9739
9740 case SK_PassByIndirectCopyRestore:
9741 OS << "pass by indirect copy and restore";
9742 break;
9743
9744 case SK_PassByIndirectRestore:
9745 OS << "pass by indirect restore";
9746 break;
9747
9748 case SK_ProduceObjCObject:
9749 OS << "Objective-C object retension";
9750 break;
9751
9752 case SK_StdInitializerList:
9753 OS << "std::initializer_list from initializer list";
9754 break;
9755
9756 case SK_StdInitializerListConstructorCall:
9757 OS << "list initialization from std::initializer_list";
9758 break;
9759
9760 case SK_OCLSamplerInit:
9761 OS << "OpenCL sampler_t from integer constant";
9762 break;
9763
9764 case SK_OCLZeroOpaqueType:
9765 OS << "OpenCL opaque type from zero";
9766 break;
9767 }
9768
9769 OS << " [" << S->Type.getAsString() << ']';
9770 }
9771
9772 OS << '\n';
9773}
9774
9775void InitializationSequence::dump() const {
9776 dump(llvm::errs());
9777}
9778
9779static bool NarrowingErrs(const LangOptions &L) {
9780 return L.CPlusPlus11 &&
9781 (!L.MicrosoftExt || L.isCompatibleWithMSVC(LangOptions::MSVC2015));
9782}
9783
9784static void DiagnoseNarrowingInInitList(Sema &S,
9785 const ImplicitConversionSequence &ICS,
9786 QualType PreNarrowingType,
9787 QualType EntityType,
9788 const Expr *PostInit) {
9789 const StandardConversionSequence *SCS = nullptr;
9790 switch (ICS.getKind()) {
9791 case ImplicitConversionSequence::StandardConversion:
9792 SCS = &ICS.Standard;
9793 break;
9794 case ImplicitConversionSequence::UserDefinedConversion:
9795 SCS = &ICS.UserDefined.After;
9796 break;
9797 case ImplicitConversionSequence::AmbiguousConversion:
9798 case ImplicitConversionSequence::EllipsisConversion:
9799 case ImplicitConversionSequence::BadConversion:
9800 return;
9801 }
9802
9803 // C++11 [dcl.init.list]p7: Check whether this is a narrowing conversion.
9804 APValue ConstantValue;
9805 QualType ConstantType;
9806 switch (SCS->getNarrowingKind(S.Context, PostInit, ConstantValue,
9807 ConstantType)) {
9808 case NK_Not_Narrowing:
9809 case NK_Dependent_Narrowing:
9810 // No narrowing occurred.
9811 return;
9812
9813 case NK_Type_Narrowing:
9814 // This was a floating-to-integer conversion, which is always considered a
9815 // narrowing conversion even if the value is a constant and can be
9816 // represented exactly as an integer.
9817 S.Diag(PostInit->getBeginLoc(), NarrowingErrs(S.getLangOpts())
9818 ? diag::ext_init_list_type_narrowing
9819 : diag::warn_init_list_type_narrowing)
9820 << PostInit->getSourceRange()
9821 << PreNarrowingType.getLocalUnqualifiedType()
9822 << EntityType.getLocalUnqualifiedType();
9823 break;
9824
9825 case NK_Constant_Narrowing:
9826 // A constant value was narrowed.
9827 S.Diag(PostInit->getBeginLoc(),
9828 NarrowingErrs(S.getLangOpts())
9829 ? diag::ext_init_list_constant_narrowing
9830 : diag::warn_init_list_constant_narrowing)
9831 << PostInit->getSourceRange()
9832 << ConstantValue.getAsString(S.getASTContext(), ConstantType)
9833 << EntityType.getLocalUnqualifiedType();
9834 break;
9835
9836 case NK_Variable_Narrowing:
9837 // A variable's value may have been narrowed.
9838 S.Diag(PostInit->getBeginLoc(),
9839 NarrowingErrs(S.getLangOpts())
9840 ? diag::ext_init_list_variable_narrowing
9841 : diag::warn_init_list_variable_narrowing)
9842 << PostInit->getSourceRange()
9843 << PreNarrowingType.getLocalUnqualifiedType()
9844 << EntityType.getLocalUnqualifiedType();
9845 break;
9846 }
9847
9848 SmallString<128> StaticCast;
9849 llvm::raw_svector_ostream OS(StaticCast);
9850 OS << "static_cast<";
9851 if (const TypedefType *TT = EntityType->getAs<TypedefType>()) {
9852 // It's important to use the typedef's name if there is one so that the
9853 // fixit doesn't break code using types like int64_t.
9854 //
9855 // FIXME: This will break if the typedef requires qualification. But
9856 // getQualifiedNameAsString() includes non-machine-parsable components.
9857 OS << *TT->getDecl();
9858 } else if (const BuiltinType *BT = EntityType->getAs<BuiltinType>())
9859 OS << BT->getName(S.getLangOpts());
9860 else {
9861 // Oops, we didn't find the actual type of the variable. Don't emit a fixit
9862 // with a broken cast.
9863 return;
9864 }
9865 OS << ">(";
9866 S.Diag(PostInit->getBeginLoc(), diag::note_init_list_narrowing_silence)
9867 << PostInit->getSourceRange()
9868 << FixItHint::CreateInsertion(PostInit->getBeginLoc(), OS.str())
9869 << FixItHint::CreateInsertion(
9870 S.getLocForEndOfToken(PostInit->getEndLoc()), ")");
9871}
9872
9873//===----------------------------------------------------------------------===//
9874// Initialization helper functions
9875//===----------------------------------------------------------------------===//
9876bool
9877Sema::CanPerformCopyInitialization(const InitializedEntity &Entity,
9878 ExprResult Init) {
9879 if (Init.isInvalid())
9880 return false;
9881
9882 Expr *InitE = Init.get();
9883 assert(InitE && "No initialization expression")((void)0);
9884
9885 InitializationKind Kind =
9886 InitializationKind::CreateCopy(InitE->getBeginLoc(), SourceLocation());
9887 InitializationSequence Seq(*this, Entity, Kind, InitE);
9888 return !Seq.Failed();
9889}
9890
9891ExprResult
9892Sema::PerformCopyInitialization(const InitializedEntity &Entity,
9893 SourceLocation EqualLoc,
9894 ExprResult Init,
9895 bool TopLevelOfInitList,
9896 bool AllowExplicit) {
9897 if (Init.isInvalid())
9898 return ExprError();
9899
9900 Expr *InitE = Init.get();
9901 assert(InitE && "No initialization expression?")((void)0);
9902
9903 if (EqualLoc.isInvalid())
9904 EqualLoc = InitE->getBeginLoc();
9905
9906 InitializationKind Kind = InitializationKind::CreateCopy(
9907 InitE->getBeginLoc(), EqualLoc, AllowExplicit);
9908 InitializationSequence Seq(*this, Entity, Kind, InitE, TopLevelOfInitList);
9909
9910 // Prevent infinite recursion when performing parameter copy-initialization.
9911 const bool ShouldTrackCopy =
9912 Entity.isParameterKind() && Seq.isConstructorInitialization();
9913 if (ShouldTrackCopy) {
9914 if (llvm::find(CurrentParameterCopyTypes, Entity.getType()) !=
9915 CurrentParameterCopyTypes.end()) {
9916 Seq.SetOverloadFailure(
9917 InitializationSequence::FK_ConstructorOverloadFailed,
9918 OR_No_Viable_Function);
9919
9920 // Try to give a meaningful diagnostic note for the problematic
9921 // constructor.
9922 const auto LastStep = Seq.step_end() - 1;
9923 assert(LastStep->Kind ==((void)0)
9924 InitializationSequence::SK_ConstructorInitialization)((void)0);
9925 const FunctionDecl *Function = LastStep->Function.Function;
9926 auto Candidate =
9927 llvm::find_if(Seq.getFailedCandidateSet(),
9928 [Function](const OverloadCandidate &Candidate) -> bool {
9929 return Candidate.Viable &&
9930 Candidate.Function == Function &&
9931 Candidate.Conversions.size() > 0;
9932 });
9933 if (Candidate != Seq.getFailedCandidateSet().end() &&
9934 Function->getNumParams() > 0) {
9935 Candidate->Viable = false;
9936 Candidate->FailureKind = ovl_fail_bad_conversion;
9937 Candidate->Conversions[0].setBad(BadConversionSequence::no_conversion,
9938 InitE,
9939 Function->getParamDecl(0)->getType());
9940 }
9941 }
9942 CurrentParameterCopyTypes.push_back(Entity.getType());
9943 }
9944
9945 ExprResult Result = Seq.Perform(*this, Entity, Kind, InitE);
9946
9947 if (ShouldTrackCopy)
9948 CurrentParameterCopyTypes.pop_back();
9949
9950 return Result;
9951}
9952
9953/// Determine whether RD is, or is derived from, a specialization of CTD.
9954static bool isOrIsDerivedFromSpecializationOf(CXXRecordDecl *RD,
9955 ClassTemplateDecl *CTD) {
9956 auto NotSpecialization = [&] (const CXXRecordDecl *Candidate) {
9957 auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(Candidate);
9958 return !CTSD || !declaresSameEntity(CTSD->getSpecializedTemplate(), CTD);
9959 };
9960 return !(NotSpecialization(RD) && RD->forallBases(NotSpecialization));
9961}
9962
9963QualType Sema::DeduceTemplateSpecializationFromInitializer(
9964 TypeSourceInfo *TSInfo, const InitializedEntity &Entity,
9965 const InitializationKind &Kind, MultiExprArg Inits) {
9966 auto *DeducedTST = dyn_cast<DeducedTemplateSpecializationType>(
9967 TSInfo->getType()->getContainedDeducedType());
9968 assert(DeducedTST && "not a deduced template specialization type")((void)0);
9969
9970 auto TemplateName = DeducedTST->getTemplateName();
9971 if (TemplateName.isDependent())
9972 return SubstAutoType(TSInfo->getType(), Context.DependentTy);
9973
9974 // We can only perform deduction for class templates.
9975 auto *Template =
9976 dyn_cast_or_null<ClassTemplateDecl>(TemplateName.getAsTemplateDecl());
9977 if (!Template) {
9978 Diag(Kind.getLocation(),
9979 diag::err_deduced_non_class_template_specialization_type)
9980 << (int)getTemplateNameKindForDiagnostics(TemplateName) << TemplateName;
9981 if (auto *TD = TemplateName.getAsTemplateDecl())
9982 Diag(TD->getLocation(), diag::note_template_decl_here);
9983 return QualType();
9984 }
9985
9986 // Can't deduce from dependent arguments.
9987 if (Expr::hasAnyTypeDependentArguments(Inits)) {
9988 Diag(TSInfo->getTypeLoc().getBeginLoc(),
9989 diag::warn_cxx14_compat_class_template_argument_deduction)
9990 << TSInfo->getTypeLoc().getSourceRange() << 0;
9991 return SubstAutoType(TSInfo->getType(), Context.DependentTy);
9992 }
9993
9994 // FIXME: Perform "exact type" matching first, per CWG discussion?
9995 // Or implement this via an implied 'T(T) -> T' deduction guide?
9996
9997 // FIXME: Do we need/want a std::initializer_list<T> special case?
9998
9999 // Look up deduction guides, including those synthesized from constructors.
10000 //
10001 // C++1z [over.match.class.deduct]p1:
10002 // A set of functions and function templates is formed comprising:
10003 // - For each constructor of the class template designated by the
10004 // template-name, a function template [...]
10005 // - For each deduction-guide, a function or function template [...]
10006 DeclarationNameInfo NameInfo(
10007 Context.DeclarationNames.getCXXDeductionGuideName(Template),
10008 TSInfo->getTypeLoc().getEndLoc());
10009 LookupResult Guides(*this, NameInfo, LookupOrdinaryName);
10010 LookupQualifiedName(Guides, Template->getDeclContext());
10011
10012 // FIXME: Do not diagnose inaccessible deduction guides. The standard isn't
10013 // clear on this, but they're not found by name so access does not apply.
10014 Guides.suppressDiagnostics();
10015
10016 // Figure out if this is list-initialization.
10017 InitListExpr *ListInit =
10018 (Inits.size() == 1 && Kind.getKind() != InitializationKind::IK_Direct)
10019 ? dyn_cast<InitListExpr>(Inits[0])
10020 : nullptr;
10021
10022 // C++1z [over.match.class.deduct]p1:
10023 // Initialization and overload resolution are performed as described in
10024 // [dcl.init] and [over.match.ctor], [over.match.copy], or [over.match.list]
10025 // (as appropriate for the type of initialization performed) for an object
10026 // of a hypothetical class type, where the selected functions and function
10027 // templates are considered to be the constructors of that class type
10028 //
10029 // Since we know we're initializing a class type of a type unrelated to that
10030 // of the initializer, this reduces to something fairly reasonable.
10031 OverloadCandidateSet Candidates(Kind.getLocation(),
10032 OverloadCandidateSet::CSK_Normal);
10033 OverloadCandidateSet::iterator Best;
10034
10035 bool HasAnyDeductionGuide = false;
10036 bool AllowExplicit = !Kind.isCopyInit() || ListInit;
10037
10038 auto tryToResolveOverload =
10039 [&](bool OnlyListConstructors) -> OverloadingResult {
10040 Candidates.clear(OverloadCandidateSet::CSK_Normal);
10041 HasAnyDeductionGuide = false;
10042
10043 for (auto I = Guides.begin(), E = Guides.end(); I != E; ++I) {
10044 NamedDecl *D = (*I)->getUnderlyingDecl();
10045 if (D->isInvalidDecl())
10046 continue;
10047
10048 auto *TD = dyn_cast<FunctionTemplateDecl>(D);
10049 auto *GD = dyn_cast_or_null<CXXDeductionGuideDecl>(
10050 TD ? TD->getTemplatedDecl() : dyn_cast<FunctionDecl>(D));
10051 if (!GD)
10052 continue;
10053
10054 if (!GD->isImplicit())
10055 HasAnyDeductionGuide = true;
10056
10057 // C++ [over.match.ctor]p1: (non-list copy-initialization from non-class)
10058 // For copy-initialization, the candidate functions are all the
10059 // converting constructors (12.3.1) of that class.
10060 // C++ [over.match.copy]p1: (non-list copy-initialization from class)
10061 // The converting constructors of T are candidate functions.
10062 if (!AllowExplicit) {
10063 // Overload resolution checks whether the deduction guide is declared
10064 // explicit for us.
10065
10066 // When looking for a converting constructor, deduction guides that
10067 // could never be called with one argument are not interesting to
10068 // check or note.
10069 if (GD->getMinRequiredArguments() > 1 ||
10070 (GD->getNumParams() == 0 && !GD->isVariadic()))
10071 continue;
10072 }
10073
10074 // C++ [over.match.list]p1.1: (first phase list initialization)
10075 // Initially, the candidate functions are the initializer-list
10076 // constructors of the class T
10077 if (OnlyListConstructors && !isInitListConstructor(GD))
10078 continue;
10079
10080 // C++ [over.match.list]p1.2: (second phase list initialization)
10081 // the candidate functions are all the constructors of the class T
10082 // C++ [over.match.ctor]p1: (all other cases)
10083 // the candidate functions are all the constructors of the class of
10084 // the object being initialized
10085
10086 // C++ [over.best.ics]p4:
10087 // When [...] the constructor [...] is a candidate by
10088 // - [over.match.copy] (in all cases)
10089 // FIXME: The "second phase of [over.match.list] case can also
10090 // theoretically happen here, but it's not clear whether we can
10091 // ever have a parameter of the right type.
10092 bool SuppressUserConversions = Kind.isCopyInit();
10093
10094 if (TD)
10095 AddTemplateOverloadCandidate(TD, I.getPair(), /*ExplicitArgs*/ nullptr,
10096 Inits, Candidates, SuppressUserConversions,
10097 /*PartialOverloading*/ false,
10098 AllowExplicit);
10099 else
10100 AddOverloadCandidate(GD, I.getPair(), Inits, Candidates,
10101 SuppressUserConversions,
10102 /*PartialOverloading*/ false, AllowExplicit);
10103 }
10104 return Candidates.BestViableFunction(*this, Kind.getLocation(), Best);
10105 };
10106
10107 OverloadingResult Result = OR_No_Viable_Function;
10108
10109 // C++11 [over.match.list]p1, per DR1467: for list-initialization, first
10110 // try initializer-list constructors.
10111 if (ListInit) {
10112 bool TryListConstructors = true;
10113
10114 // Try list constructors unless the list is empty and the class has one or
10115 // more default constructors, in which case those constructors win.
10116 if (!ListInit->getNumInits()) {
10117 for (NamedDecl *D : Guides) {
10118 auto *FD = dyn_cast<FunctionDecl>(D->getUnderlyingDecl());
10119 if (FD && FD->getMinRequiredArguments() == 0) {
10120 TryListConstructors = false;
10121 break;
10122 }
10123 }
10124 } else if (ListInit->getNumInits() == 1) {
10125 // C++ [over.match.class.deduct]:
10126 // As an exception, the first phase in [over.match.list] (considering
10127 // initializer-list constructors) is omitted if the initializer list
10128 // consists of a single expression of type cv U, where U is a
10129 // specialization of C or a class derived from a specialization of C.
10130 Expr *E = ListInit->getInit(0);
10131 auto *RD = E->getType()->getAsCXXRecordDecl();
10132 if (!isa<InitListExpr>(E) && RD &&
10133 isCompleteType(Kind.getLocation(), E->getType()) &&
10134 isOrIsDerivedFromSpecializationOf(RD, Template))
10135 TryListConstructors = false;
10136 }
10137
10138 if (TryListConstructors)
10139 Result = tryToResolveOverload(/*OnlyListConstructor*/true);
10140 // Then unwrap the initializer list and try again considering all
10141 // constructors.
10142 Inits = MultiExprArg(ListInit->getInits(), ListInit->getNumInits());
10143 }
10144
10145 // If list-initialization fails, or if we're doing any other kind of
10146 // initialization, we (eventually) consider constructors.
10147 if (Result == OR_No_Viable_Function)
10148 Result = tryToResolveOverload(/*OnlyListConstructor*/false);
10149
10150 switch (Result) {
10151 case OR_Ambiguous:
10152 // FIXME: For list-initialization candidates, it'd usually be better to
10153 // list why they were not viable when given the initializer list itself as
10154 // an argument.
10155 Candidates.NoteCandidates(
10156 PartialDiagnosticAt(
10157 Kind.getLocation(),
10158 PDiag(diag::err_deduced_class_template_ctor_ambiguous)
10159 << TemplateName),
10160 *this, OCD_AmbiguousCandidates, Inits);
10161 return QualType();
10162
10163 case OR_No_Viable_Function: {
10164 CXXRecordDecl *Primary =
10165 cast<ClassTemplateDecl>(Template)->getTemplatedDecl();
10166 bool Complete =
10167 isCompleteType(Kind.getLocation(), Context.getTypeDeclType(Primary));
10168 Candidates.NoteCandidates(
10169 PartialDiagnosticAt(
10170 Kind.getLocation(),
10171 PDiag(Complete ? diag::err_deduced_class_template_ctor_no_viable
10172 : diag::err_deduced_class_template_incomplete)
10173 << TemplateName << !Guides.empty()),
10174 *this, OCD_AllCandidates, Inits);
10175 return QualType();
10176 }
10177
10178 case OR_Deleted: {
10179 Diag(Kind.getLocation(), diag::err_deduced_class_template_deleted)
10180 << TemplateName;
10181 NoteDeletedFunction(Best->Function);
10182 return QualType();
10183 }
10184
10185 case OR_Success:
10186 // C++ [over.match.list]p1:
10187 // In copy-list-initialization, if an explicit constructor is chosen, the
10188 // initialization is ill-formed.
10189 if (Kind.isCopyInit() && ListInit &&
10190 cast<CXXDeductionGuideDecl>(Best->Function)->isExplicit()) {
10191 bool IsDeductionGuide = !Best->Function->isImplicit();
10192 Diag(Kind.getLocation(), diag::err_deduced_class_template_explicit)
10193 << TemplateName << IsDeductionGuide;
10194 Diag(Best->Function->getLocation(),
10195 diag::note_explicit_ctor_deduction_guide_here)
10196 << IsDeductionGuide;
10197 return QualType();
10198 }
10199
10200 // Make sure we didn't select an unusable deduction guide, and mark it
10201 // as referenced.
10202 DiagnoseUseOfDecl(Best->Function, Kind.getLocation());
10203 MarkFunctionReferenced(Kind.getLocation(), Best->Function);
10204 break;
10205 }
10206
10207 // C++ [dcl.type.class.deduct]p1:
10208 // The placeholder is replaced by the return type of the function selected
10209 // by overload resolution for class template deduction.
10210 QualType DeducedType =
10211 SubstAutoType(TSInfo->getType(), Best->Function->getReturnType());
10212 Diag(TSInfo->getTypeLoc().getBeginLoc(),
10213 diag::warn_cxx14_compat_class_template_argument_deduction)
10214 << TSInfo->getTypeLoc().getSourceRange() << 1 << DeducedType;
10215
10216 // Warn if CTAD was used on a type that does not have any user-defined
10217 // deduction guides.
10218 if (!HasAnyDeductionGuide) {
10219 Diag(TSInfo->getTypeLoc().getBeginLoc(),
10220 diag::warn_ctad_maybe_unsupported)
10221 << TemplateName;
10222 Diag(Template->getLocation(), diag::note_suppress_ctad_maybe_unsupported);
10223 }
10224
10225 return DeducedType;
10226}
←

/usr/src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/include/clang/AST/Type.h

1//===- Type.h - C Language Family Type Representation -----------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9/// \file
10/// C Language Family Type Representation
11///
12/// This file defines the clang::Type interface and subclasses, used to
13/// represent types for languages in the C family.
14//
15//===----------------------------------------------------------------------===//
16
17#ifndef LLVM_CLANG_AST_TYPE_H
18#define LLVM_CLANG_AST_TYPE_H
19
20#include "clang/AST/DependenceFlags.h"
21#include "clang/AST/NestedNameSpecifier.h"
22#include "clang/AST/TemplateName.h"
23#include "clang/Basic/AddressSpaces.h"
24#include "clang/Basic/AttrKinds.h"
25#include "clang/Basic/Diagnostic.h"
26#include "clang/Basic/ExceptionSpecificationType.h"
27#include "clang/Basic/LLVM.h"
28#include "clang/Basic/Linkage.h"
29#include "clang/Basic/PartialDiagnostic.h"
30#include "clang/Basic/SourceLocation.h"
31#include "clang/Basic/Specifiers.h"
32#include "clang/Basic/Visibility.h"
33#include "llvm/ADT/APInt.h"
34#include "llvm/ADT/APSInt.h"
35#include "llvm/ADT/ArrayRef.h"
36#include "llvm/ADT/FoldingSet.h"
37#include "llvm/ADT/None.h"
38#include "llvm/ADT/Optional.h"
39#include "llvm/ADT/PointerIntPair.h"
40#include "llvm/ADT/PointerUnion.h"
41#include "llvm/ADT/StringRef.h"
42#include "llvm/ADT/Twine.h"
43#include "llvm/ADT/iterator_range.h"
44#include "llvm/Support/Casting.h"
45#include "llvm/Support/Compiler.h"
46#include "llvm/Support/ErrorHandling.h"
47#include "llvm/Support/PointerLikeTypeTraits.h"
48#include "llvm/Support/TrailingObjects.h"
49#include "llvm/Support/type_traits.h"
50#include <cassert>
51#include <cstddef>
52#include <cstdint>
53#include <cstring>
54#include <string>
55#include <type_traits>
56#include <utility>
57
58namespace clang {
59
60class ExtQuals;
61class QualType;
62class ConceptDecl;
63class TagDecl;
64class TemplateParameterList;
65class Type;
66
67enum {
68 TypeAlignmentInBits = 4,
69 TypeAlignment = 1 << TypeAlignmentInBits
70};
71
72namespace serialization {
73 template <class T> class AbstractTypeReader;
74 template <class T> class AbstractTypeWriter;
75}
76
77} // namespace clang
78
79namespace llvm {
80
81 template <typename T>
82 struct PointerLikeTypeTraits;
83 template<>
84 struct PointerLikeTypeTraits< ::clang::Type*> {
85 static inline void *getAsVoidPointer(::clang::Type *P) { return P; }
86
87 static inline ::clang::Type *getFromVoidPointer(void *P) {
88 return static_cast< ::clang::Type*>(P);
89 }
90
91 static constexpr int NumLowBitsAvailable = clang::TypeAlignmentInBits;
92 };
93
94 template<>
95 struct PointerLikeTypeTraits< ::clang::ExtQuals*> {
96 static inline void *getAsVoidPointer(::clang::ExtQuals *P) { return P; }
97
98 static inline ::clang::ExtQuals *getFromVoidPointer(void *P) {
99 return static_cast< ::clang::ExtQuals*>(P);
100 }
101
102 static constexpr int NumLowBitsAvailable = clang::TypeAlignmentInBits;
103 };
104
105} // namespace llvm
106
107namespace clang {
108
109class ASTContext;
110template <typename> class CanQual;
111class CXXRecordDecl;
112class DeclContext;
113class EnumDecl;
114class Expr;
115class ExtQualsTypeCommonBase;
116class FunctionDecl;
117class IdentifierInfo;
118class NamedDecl;
119class ObjCInterfaceDecl;
120class ObjCProtocolDecl;
121class ObjCTypeParamDecl;
122struct PrintingPolicy;
123class RecordDecl;
124class Stmt;
125class TagDecl;
126class TemplateArgument;
127class TemplateArgumentListInfo;
128class TemplateArgumentLoc;
129class TemplateTypeParmDecl;
130class TypedefNameDecl;
131class UnresolvedUsingTypenameDecl;
132
133using CanQualType = CanQual<Type>;
134
135// Provide forward declarations for all of the *Type classes.
136#define TYPE(Class, Base) class Class##Type;
137#include "clang/AST/TypeNodes.inc"
138
139/// The collection of all-type qualifiers we support.
140/// Clang supports five independent qualifiers:
141/// * C99: const, volatile, and restrict
142/// * MS: __unaligned
143/// * Embedded C (TR18037): address spaces
144/// * Objective C: the GC attributes (none, weak, or strong)
145class Qualifiers {
146public:
147 enum TQ { // NOTE: These flags must be kept in sync with DeclSpec::TQ.
148 Const = 0x1,
149 Restrict = 0x2,
150 Volatile = 0x4,
151 CVRMask = Const | Volatile | Restrict
152 };
153
154 enum GC {
155 GCNone = 0,
156 Weak,
157 Strong
158 };
159
160 enum ObjCLifetime {
161 /// There is no lifetime qualification on this type.
162 OCL_None,
163
164 /// This object can be modified without requiring retains or
165 /// releases.
166 OCL_ExplicitNone,
167
168 /// Assigning into this object requires the old value to be
169 /// released and the new value to be retained. The timing of the
170 /// release of the old value is inexact: it may be moved to
171 /// immediately after the last known point where the value is
172 /// live.
173 OCL_Strong,
174
175 /// Reading or writing from this object requires a barrier call.
176 OCL_Weak,
177
178 /// Assigning into this object requires a lifetime extension.
179 OCL_Autoreleasing
180 };
181
182 enum {
183 /// The maximum supported address space number.
184 /// 23 bits should be enough for anyone.
185 MaxAddressSpace = 0x7fffffu,
186
187 /// The width of the "fast" qualifier mask.
188 FastWidth = 3,
189
190 /// The fast qualifier mask.
191 FastMask = (1 << FastWidth) - 1
192 };
193
194 /// Returns the common set of qualifiers while removing them from
195 /// the given sets.
196 static Qualifiers removeCommonQualifiers(Qualifiers &L, Qualifiers &R) {
197 // If both are only CVR-qualified, bit operations are sufficient.
198 if (!(L.Mask & ~CVRMask) && !(R.Mask & ~CVRMask)) {
199 Qualifiers Q;
200 Q.Mask = L.Mask & R.Mask;
201 L.Mask &= ~Q.Mask;
202 R.Mask &= ~Q.Mask;
203 return Q;
204 }
205
206 Qualifiers Q;
207 unsigned CommonCRV = L.getCVRQualifiers() & R.getCVRQualifiers();
208 Q.addCVRQualifiers(CommonCRV);
209 L.removeCVRQualifiers(CommonCRV);
210 R.removeCVRQualifiers(CommonCRV);
211
212 if (L.getObjCGCAttr() == R.getObjCGCAttr()) {
213 Q.setObjCGCAttr(L.getObjCGCAttr());
214 L.removeObjCGCAttr();
215 R.removeObjCGCAttr();
216 }
217
218 if (L.getObjCLifetime() == R.getObjCLifetime()) {
219 Q.setObjCLifetime(L.getObjCLifetime());
220 L.removeObjCLifetime();
221 R.removeObjCLifetime();
222 }
223
224 if (L.getAddressSpace() == R.getAddressSpace()) {
225 Q.setAddressSpace(L.getAddressSpace());
226 L.removeAddressSpace();
227 R.removeAddressSpace();
228 }
229 return Q;
230 }
231
232 static Qualifiers fromFastMask(unsigned Mask) {
233 Qualifiers Qs;
234 Qs.addFastQualifiers(Mask);
235 return Qs;
236 }
237
238 static Qualifiers fromCVRMask(unsigned CVR) {
239 Qualifiers Qs;
240 Qs.addCVRQualifiers(CVR);
241 return Qs;
242 }
243
244 static Qualifiers fromCVRUMask(unsigned CVRU) {
245 Qualifiers Qs;
246 Qs.addCVRUQualifiers(CVRU);
247 return Qs;
248 }
249
250 // Deserialize qualifiers from an opaque representation.
251 static Qualifiers fromOpaqueValue(unsigned opaque) {
252 Qualifiers Qs;
253 Qs.Mask = opaque;
254 return Qs;
255 }
256
257 // Serialize these qualifiers into an opaque representation.
258 unsigned getAsOpaqueValue() const {
259 return Mask;
260 }
261
262 bool hasConst() const { return Mask & Const; }
263 bool hasOnlyConst() const { return Mask == Const; }
264 void removeConst() { Mask &= ~Const; }
265 void addConst() { Mask |= Const; }
266
267 bool hasVolatile() const { return Mask & Volatile; }
268 bool hasOnlyVolatile() const { return Mask == Volatile; }
269 void removeVolatile() { Mask &= ~Volatile; }
270 void addVolatile() { Mask |= Volatile; }
271
272 bool hasRestrict() const { return Mask & Restrict; }
273 bool hasOnlyRestrict() const { return Mask == Restrict; }
274 void removeRestrict() { Mask &= ~Restrict; }
275 void addRestrict() { Mask |= Restrict; }
276
277 bool hasCVRQualifiers() const { return getCVRQualifiers(); }
278 unsigned getCVRQualifiers() const { return Mask & CVRMask; }
279 unsigned getCVRUQualifiers() const { return Mask & (CVRMask | UMask); }
280
281 void setCVRQualifiers(unsigned mask) {
282 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits")((void)0);
283 Mask = (Mask & ~CVRMask) | mask;
284 }
285 void removeCVRQualifiers(unsigned mask) {
286 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits")((void)0);
287 Mask &= ~mask;
288 }
289 void removeCVRQualifiers() {
290 removeCVRQualifiers(CVRMask);
291 }
292 void addCVRQualifiers(unsigned mask) {
293 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits")((void)0);
294 Mask |= mask;
295 }
296 void addCVRUQualifiers(unsigned mask) {
297 assert(!(mask & ~CVRMask & ~UMask) && "bitmask contains non-CVRU bits")((void)0);
298 Mask |= mask;
299 }
300
301 bool hasUnaligned() const { return Mask & UMask; }
302 void setUnaligned(bool flag) {
303 Mask = (Mask & ~UMask) | (flag ? UMask : 0);
304 }
305 void removeUnaligned() { Mask &= ~UMask; }
306 void addUnaligned() { Mask |= UMask; }
307
308 bool hasObjCGCAttr() const { return Mask & GCAttrMask; }
309 GC getObjCGCAttr() const { return GC((Mask & GCAttrMask) >> GCAttrShift); }
310 void setObjCGCAttr(GC type) {
311 Mask = (Mask & ~GCAttrMask) | (type << GCAttrShift);
312 }
313 void removeObjCGCAttr() { setObjCGCAttr(GCNone); }
314 void addObjCGCAttr(GC type) {
315 assert(type)((void)0);
316 setObjCGCAttr(type);
317 }
318 Qualifiers withoutObjCGCAttr() const {
319 Qualifiers qs = *this;
320 qs.removeObjCGCAttr();
321 return qs;
322 }
323 Qualifiers withoutObjCLifetime() const {
324 Qualifiers qs = *this;
325 qs.removeObjCLifetime();
326 return qs;
327 }
328 Qualifiers withoutAddressSpace() const {
329 Qualifiers qs = *this;
330 qs.removeAddressSpace();
331 return qs;
332 }
333
334 bool hasObjCLifetime() const { return Mask & LifetimeMask; }
335 ObjCLifetime getObjCLifetime() const {
336 return ObjCLifetime((Mask & LifetimeMask) >> LifetimeShift);
337 }
338 void setObjCLifetime(ObjCLifetime type) {
339 Mask = (Mask & ~LifetimeMask) | (type << LifetimeShift);
340 }
341 void removeObjCLifetime() { setObjCLifetime(OCL_None); }
342 void addObjCLifetime(ObjCLifetime type) {
343 assert(type)((void)0);
344 assert(!hasObjCLifetime())((void)0);
345 Mask |= (type << LifetimeShift);
346 }
347
348 /// True if the lifetime is neither None or ExplicitNone.
349 bool hasNonTrivialObjCLifetime() const {
350 ObjCLifetime lifetime = getObjCLifetime();
351 return (lifetime > OCL_ExplicitNone);
352 }
353
354 /// True if the lifetime is either strong or weak.
355 bool hasStrongOrWeakObjCLifetime() const {
356 ObjCLifetime lifetime = getObjCLifetime();
357 return (lifetime == OCL_Strong || lifetime == OCL_Weak);
358 }
359
360 bool hasAddressSpace() const { return Mask & AddressSpaceMask; }
361 LangAS getAddressSpace() const {
362 return static_cast<LangAS>(Mask >> AddressSpaceShift);
363 }
364 bool hasTargetSpecificAddressSpace() const {
365 return isTargetAddressSpace(getAddressSpace());
366 }
367 /// Get the address space attribute value to be printed by diagnostics.
368 unsigned getAddressSpaceAttributePrintValue() const {
369 auto Addr = getAddressSpace();
370 // This function is not supposed to be used with language specific
371 // address spaces. If that happens, the diagnostic message should consider
372 // printing the QualType instead of the address space value.
373 assert(Addr == LangAS::Default || hasTargetSpecificAddressSpace())((void)0);
374 if (Addr != LangAS::Default)
375 return toTargetAddressSpace(Addr);
376 // TODO: The diagnostic messages where Addr may be 0 should be fixed
377 // since it cannot differentiate the situation where 0 denotes the default
378 // address space or user specified __attribute__((address_space(0))).
379 return 0;
380 }
381 void setAddressSpace(LangAS space) {
382 assert((unsigned)space <= MaxAddressSpace)((void)0);
383 Mask = (Mask & ~AddressSpaceMask)
384 | (((uint32_t) space) << AddressSpaceShift);
385 }
386 void removeAddressSpace() { setAddressSpace(LangAS::Default); }
387 void addAddressSpace(LangAS space) {
388 assert(space != LangAS::Default)((void)0);
389 setAddressSpace(space);
390 }
391
392 // Fast qualifiers are those that can be allocated directly
393 // on a QualType object.
394 bool hasFastQualifiers() const { return getFastQualifiers(); }
395 unsigned getFastQualifiers() const { return Mask & FastMask; }
396 void setFastQualifiers(unsigned mask) {
397 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits")((void)0);
398 Mask = (Mask & ~FastMask) | mask;
399 }
400 void removeFastQualifiers(unsigned mask) {
401 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits")((void)0);
402 Mask &= ~mask;
403 }
404 void removeFastQualifiers() {
405 removeFastQualifiers(FastMask);
406 }
407 void addFastQualifiers(unsigned mask) {
408 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits")((void)0);
409 Mask |= mask;
410 }
411
412 /// Return true if the set contains any qualifiers which require an ExtQuals
413 /// node to be allocated.
414 bool hasNonFastQualifiers() const { return Mask & ~FastMask; }
415 Qualifiers getNonFastQualifiers() const {
416 Qualifiers Quals = *this;
417 Quals.setFastQualifiers(0);
418 return Quals;
419 }
420
421 /// Return true if the set contains any qualifiers.
422 bool hasQualifiers() const { return Mask; }
423 bool empty() const { return !Mask; }
424
425 /// Add the qualifiers from the given set to this set.
426 void addQualifiers(Qualifiers Q) {
427 // If the other set doesn't have any non-boolean qualifiers, just
428 // bit-or it in.
429 if (!(Q.Mask & ~CVRMask))
430 Mask |= Q.Mask;
431 else {
432 Mask |= (Q.Mask & CVRMask);
433 if (Q.hasAddressSpace())
434 addAddressSpace(Q.getAddressSpace());
435 if (Q.hasObjCGCAttr())
436 addObjCGCAttr(Q.getObjCGCAttr());
437 if (Q.hasObjCLifetime())
438 addObjCLifetime(Q.getObjCLifetime());
439 }
440 }
441
442 /// Remove the qualifiers from the given set from this set.
443 void removeQualifiers(Qualifiers Q) {
444 // If the other set doesn't have any non-boolean qualifiers, just
445 // bit-and the inverse in.
446 if (!(Q.Mask & ~CVRMask))
447 Mask &= ~Q.Mask;
448 else {
449 Mask &= ~(Q.Mask & CVRMask);
450 if (getObjCGCAttr() == Q.getObjCGCAttr())
451 removeObjCGCAttr();
452 if (getObjCLifetime() == Q.getObjCLifetime())
453 removeObjCLifetime();
454 if (getAddressSpace() == Q.getAddressSpace())
455 removeAddressSpace();
456 }
457 }
458
459 /// Add the qualifiers from the given set to this set, given that
460 /// they don't conflict.
461 void addConsistentQualifiers(Qualifiers qs) {
462 assert(getAddressSpace() == qs.getAddressSpace() ||((void)0)
463 !hasAddressSpace() || !qs.hasAddressSpace())((void)0);
464 assert(getObjCGCAttr() == qs.getObjCGCAttr() ||((void)0)
465 !hasObjCGCAttr() || !qs.hasObjCGCAttr())((void)0);
466 assert(getObjCLifetime() == qs.getObjCLifetime() ||((void)0)
467 !hasObjCLifetime() || !qs.hasObjCLifetime())((void)0);
468 Mask |= qs.Mask;
469 }
470
471 /// Returns true if address space A is equal to or a superset of B.
472 /// OpenCL v2.0 defines conversion rules (OpenCLC v2.0 s6.5.5) and notion of
473 /// overlapping address spaces.
474 /// CL1.1 or CL1.2:
475 /// every address space is a superset of itself.
476 /// CL2.0 adds:
477 /// __generic is a superset of any address space except for __constant.
478 static bool isAddressSpaceSupersetOf(LangAS A, LangAS B) {
479 // Address spaces must match exactly.
480 return A == B ||
481 // Otherwise in OpenCLC v2.0 s6.5.5: every address space except
482 // for __constant can be used as __generic.
483 (A == LangAS::opencl_generic && B != LangAS::opencl_constant) ||
484 // We also define global_device and global_host address spaces,
485 // to distinguish global pointers allocated on host from pointers
486 // allocated on device, which are a subset of __global.
487 (A == LangAS::opencl_global && (B == LangAS::opencl_global_device ||
488 B == LangAS::opencl_global_host)) ||
489 (A == LangAS::sycl_global && (B == LangAS::sycl_global_device ||
490 B == LangAS::sycl_global_host)) ||
491 // Consider pointer size address spaces to be equivalent to default.
492 ((isPtrSizeAddressSpace(A) || A == LangAS::Default) &&
493 (isPtrSizeAddressSpace(B) || B == LangAS::Default)) ||
494 // Default is a superset of SYCL address spaces.
495 (A == LangAS::Default &&
496 (B == LangAS::sycl_private || B == LangAS::sycl_local ||
497 B == LangAS::sycl_global || B == LangAS::sycl_global_device ||
498 B == LangAS::sycl_global_host));
499 }
500
501 /// Returns true if the address space in these qualifiers is equal to or
502 /// a superset of the address space in the argument qualifiers.
503 bool isAddressSpaceSupersetOf(Qualifiers other) const {
504 return isAddressSpaceSupersetOf(getAddressSpace(), other.getAddressSpace());
505 }
506
507 /// Determines if these qualifiers compatibly include another set.
508 /// Generally this answers the question of whether an object with the other
509 /// qualifiers can be safely used as an object with these qualifiers.
510 bool compatiblyIncludes(Qualifiers other) const {
511 return isAddressSpaceSupersetOf(other) &&
512 // ObjC GC qualifiers can match, be added, or be removed, but can't
513 // be changed.
514 (getObjCGCAttr() == other.getObjCGCAttr() || !hasObjCGCAttr() ||
515 !other.hasObjCGCAttr()) &&
516 // ObjC lifetime qualifiers must match exactly.
517 getObjCLifetime() == other.getObjCLifetime() &&
518 // CVR qualifiers may subset.
519 (((Mask & CVRMask) | (other.Mask & CVRMask)) == (Mask & CVRMask)) &&
520 // U qualifier may superset.
521 (!other.hasUnaligned() || hasUnaligned());
522 }
523
524 /// Determines if these qualifiers compatibly include another set of
525 /// qualifiers from the narrow perspective of Objective-C ARC lifetime.
526 ///
527 /// One set of Objective-C lifetime qualifiers compatibly includes the other
528 /// if the lifetime qualifiers match, or if both are non-__weak and the
529 /// including set also contains the 'const' qualifier, or both are non-__weak
530 /// and one is None (which can only happen in non-ARC modes).
531 bool compatiblyIncludesObjCLifetime(Qualifiers other) const {
532 if (getObjCLifetime() == other.getObjCLifetime())
533 return true;
534
535 if (getObjCLifetime() == OCL_Weak || other.getObjCLifetime() == OCL_Weak)
536 return false;
537
538 if (getObjCLifetime() == OCL_None || other.getObjCLifetime() == OCL_None)
539 return true;
540
541 return hasConst();
542 }
543
544 /// Determine whether this set of qualifiers is a strict superset of
545 /// another set of qualifiers, not considering qualifier compatibility.
546 bool isStrictSupersetOf(Qualifiers Other) const;
547
548 bool operator==(Qualifiers Other) const { return Mask == Other.Mask; }
549 bool operator!=(Qualifiers Other) const { return Mask != Other.Mask; }
550
551 explicit operator bool() const { return hasQualifiers(); }
552
553 Qualifiers &operator+=(Qualifiers R) {
554 addQualifiers(R);
555 return *this;
556 }
557
558 // Union two qualifier sets. If an enumerated qualifier appears
559 // in both sets, use the one from the right.
560 friend Qualifiers operator+(Qualifiers L, Qualifiers R) {
561 L += R;
562 return L;
563 }
564
565 Qualifiers &operator-=(Qualifiers R) {
566 removeQualifiers(R);
567 return *this;
568 }
569
570 /// Compute the difference between two qualifier sets.
571 friend Qualifiers operator-(Qualifiers L, Qualifiers R) {
572 L -= R;
573 return L;
574 }
575
576 std::string getAsString() const;
577 std::string getAsString(const PrintingPolicy &Policy) const;
578
579 static std::string getAddrSpaceAsString(LangAS AS);
580
581 bool isEmptyWhenPrinted(const PrintingPolicy &Policy) const;
582 void print(raw_ostream &OS, const PrintingPolicy &Policy,
583 bool appendSpaceIfNonEmpty = false) const;
584
585 void Profile(llvm::FoldingSetNodeID &ID) const {
586 ID.AddInteger(Mask);
587 }
588
589private:
590 // bits: |0 1 2|3|4 .. 5|6 .. 8|9 ... 31|
591 // |C R V|U|GCAttr|Lifetime|AddressSpace|
592 uint32_t Mask = 0;
593
594 static const uint32_t UMask = 0x8;
595 static const uint32_t UShift = 3;
596 static const uint32_t GCAttrMask = 0x30;
597 static const uint32_t GCAttrShift = 4;
598 static const uint32_t LifetimeMask = 0x1C0;
599 static const uint32_t LifetimeShift = 6;
600 static const uint32_t AddressSpaceMask =
601 ~(CVRMask | UMask | GCAttrMask | LifetimeMask);
602 static const uint32_t AddressSpaceShift = 9;
603};
604
605/// A std::pair-like structure for storing a qualified type split
606/// into its local qualifiers and its locally-unqualified type.
607struct SplitQualType {
608 /// The locally-unqualified type.
609 const Type *Ty = nullptr;
610
611 /// The local qualifiers.
612 Qualifiers Quals;
613
614 SplitQualType() = default;
615 SplitQualType(const Type *ty, Qualifiers qs) : Ty(ty), Quals(qs) {}
616
617 SplitQualType getSingleStepDesugaredType() const; // end of this file
618
619 // Make std::tie work.
620 std::pair<const Type *,Qualifiers> asPair() const {
621 return std::pair<const Type *, Qualifiers>(Ty, Quals);
622 }
623
624 friend bool operator==(SplitQualType a, SplitQualType b) {
625 return a.Ty == b.Ty && a.Quals == b.Quals;
626 }
627 friend bool operator!=(SplitQualType a, SplitQualType b) {
628 return a.Ty != b.Ty || a.Quals != b.Quals;
629 }
630};
631
632/// The kind of type we are substituting Objective-C type arguments into.
633///
634/// The kind of substitution affects the replacement of type parameters when
635/// no concrete type information is provided, e.g., when dealing with an
636/// unspecialized type.
637enum class ObjCSubstitutionContext {
638 /// An ordinary type.
639 Ordinary,
640
641 /// The result type of a method or function.
642 Result,
643
644 /// The parameter type of a method or function.
645 Parameter,
646
647 /// The type of a property.
648 Property,
649
650 /// The superclass of a type.
651 Superclass,
652};
653
654/// A (possibly-)qualified type.
655///
656/// For efficiency, we don't store CV-qualified types as nodes on their
657/// own: instead each reference to a type stores the qualifiers. This
658/// greatly reduces the number of nodes we need to allocate for types (for
659/// example we only need one for 'int', 'const int', 'volatile int',
660/// 'const volatile int', etc).
661///
662/// As an added efficiency bonus, instead of making this a pair, we
663/// just store the two bits we care about in the low bits of the
664/// pointer. To handle the packing/unpacking, we make QualType be a
665/// simple wrapper class that acts like a smart pointer. A third bit
666/// indicates whether there are extended qualifiers present, in which
667/// case the pointer points to a special structure.
668class QualType {
669 friend class QualifierCollector;
670
671 // Thankfully, these are efficiently composable.
672 llvm::PointerIntPair<llvm::PointerUnion<const Type *, const ExtQuals *>,
673 Qualifiers::FastWidth> Value;
674
675 const ExtQuals *getExtQualsUnsafe() const {
676 return Value.getPointer().get<const ExtQuals*>();
677 }
678
679 const Type *getTypePtrUnsafe() const {
680 return Value.getPointer().get<const Type*>();
681 }
682
683 const ExtQualsTypeCommonBase *getCommonPtr() const {
684 assert(!isNull() && "Cannot retrieve a NULL type pointer")((void)0);
685 auto CommonPtrVal = reinterpret_cast<uintptr_t>(Value.getOpaqueValue());
686 CommonPtrVal &= ~(uintptr_t)((1 << TypeAlignmentInBits) - 1);
687 return reinterpret_cast<ExtQualsTypeCommonBase*>(CommonPtrVal);
688 }
689
690public:
691 QualType() = default;
692 QualType(const Type *Ptr, unsigned Quals) : Value(Ptr, Quals) {}
693 QualType(const ExtQuals *Ptr, unsigned Quals) : Value(Ptr, Quals) {}
694
695 unsigned getLocalFastQualifiers() const { return Value.getInt(); }
696 void setLocalFastQualifiers(unsigned Quals) { Value.setInt(Quals); }
697
698 /// Retrieves a pointer to the underlying (unqualified) type.
699 ///
700 /// This function requires that the type not be NULL. If the type might be
701 /// NULL, use the (slightly less efficient) \c getTypePtrOrNull().
702 const Type *getTypePtr() const;
703
704 const Type *getTypePtrOrNull() const;
705
706 /// Retrieves a pointer to the name of the base type.
707 const IdentifierInfo *getBaseTypeIdentifier() const;
708
709 /// Divides a QualType into its unqualified type and a set of local
710 /// qualifiers.
711 SplitQualType split() const;
712
713 void *getAsOpaquePtr() const { return Value.getOpaqueValue(); }
714
715 static QualType getFromOpaquePtr(const void *Ptr) {
716 QualType T;
717 T.Value.setFromOpaqueValue(const_cast<void*>(Ptr));
718 return T;
719 }
720
721 const Type &operator*() const {
722 return *getTypePtr();
723 }
724
725 const Type *operator->() const {
726 return getTypePtr();
727 }
728
729 bool isCanonical() const;
730 bool isCanonicalAsParam() const;
731
732 /// Return true if this QualType doesn't point to a type yet.
733 bool isNull() const {
734 return Value.getPointer().isNull();
735 }
736
737 /// Determine whether this particular QualType instance has the
738 /// "const" qualifier set, without looking through typedefs that may have
739 /// added "const" at a different level.
740 bool isLocalConstQualified() const {
741 return (getLocalFastQualifiers() & Qualifiers::Const);
742 }
743
744 /// Determine whether this type is const-qualified.
745 bool isConstQualified() const;
746
747 /// Determine whether this particular QualType instance has the
748 /// "restrict" qualifier set, without looking through typedefs that may have
749 /// added "restrict" at a different level.
750 bool isLocalRestrictQualified() const {
751 return (getLocalFastQualifiers() & Qualifiers::Restrict);
752 }
753
754 /// Determine whether this type is restrict-qualified.
755 bool isRestrictQualified() const;
756
757 /// Determine whether this particular QualType instance has the
758 /// "volatile" qualifier set, without looking through typedefs that may have
759 /// added "volatile" at a different level.
760 bool isLocalVolatileQualified() const {
761 return (getLocalFastQualifiers() & Qualifiers::Volatile);
762 }
763
764 /// Determine whether this type is volatile-qualified.
765 bool isVolatileQualified() const;
766
767 /// Determine whether this particular QualType instance has any
768 /// qualifiers, without looking through any typedefs that might add
769 /// qualifiers at a different level.
770 bool hasLocalQualifiers() const {
771 return getLocalFastQualifiers() || hasLocalNonFastQualifiers();
772 }
773
774 /// Determine whether this type has any qualifiers.
775 bool hasQualifiers() const;
776
777 /// Determine whether this particular QualType instance has any
778 /// "non-fast" qualifiers, e.g., those that are stored in an ExtQualType
779 /// instance.
780 bool hasLocalNonFastQualifiers() const {
781 return Value.getPointer().is<const ExtQuals*>();
782 }
783
784 /// Retrieve the set of qualifiers local to this particular QualType
785 /// instance, not including any qualifiers acquired through typedefs or
786 /// other sugar.
787 Qualifiers getLocalQualifiers() const;
788
789 /// Retrieve the set of qualifiers applied to this type.
790 Qualifiers getQualifiers() const;
791
792 /// Retrieve the set of CVR (const-volatile-restrict) qualifiers
793 /// local to this particular QualType instance, not including any qualifiers
794 /// acquired through typedefs or other sugar.
795 unsigned getLocalCVRQualifiers() const {
796 return getLocalFastQualifiers();
797 }
798
799 /// Retrieve the set of CVR (const-volatile-restrict) qualifiers
800 /// applied to this type.
801 unsigned getCVRQualifiers() const;
802
803 bool isConstant(const ASTContext& Ctx) const {
804 return QualType::isConstant(*this, Ctx);
805 }
806
807 /// Determine whether this is a Plain Old Data (POD) type (C++ 3.9p10).
808 bool isPODType(const ASTContext &Context) const;
809
810 /// Return true if this is a POD type according to the rules of the C++98
811 /// standard, regardless of the current compilation's language.
812 bool isCXX98PODType(const ASTContext &Context) const;
813
814 /// Return true if this is a POD type according to the more relaxed rules
815 /// of the C++11 standard, regardless of the current compilation's language.
816 /// (C++0x [basic.types]p9). Note that, unlike
817 /// CXXRecordDecl::isCXX11StandardLayout, this takes DRs into account.
818 bool isCXX11PODType(const ASTContext &Context) const;
819
820 /// Return true if this is a trivial type per (C++0x [basic.types]p9)
821 bool isTrivialType(const ASTContext &Context) const;
822
823 /// Return true if this is a trivially copyable type (C++0x [basic.types]p9)
824 bool isTriviallyCopyableType(const ASTContext &Context) const;
825
826
827 /// Returns true if it is a class and it might be dynamic.
828 bool mayBeDynamicClass() const;
829
830 /// Returns true if it is not a class or if the class might not be dynamic.
831 bool mayBeNotDynamicClass() const;
832
833 // Don't promise in the API that anything besides 'const' can be
834 // easily added.
835
836 /// Add the `const` type qualifier to this QualType.
837 void addConst() {
838 addFastQualifiers(Qualifiers::Const);
839 }
840 QualType withConst() const {
841 return withFastQualifiers(Qualifiers::Const);
842 }
843
844 /// Add the `volatile` type qualifier to this QualType.
845 void addVolatile() {
846 addFastQualifiers(Qualifiers::Volatile);
847 }
848 QualType withVolatile() const {
849 return withFastQualifiers(Qualifiers::Volatile);
850 }
851
852 /// Add the `restrict` qualifier to this QualType.
853 void addRestrict() {
854 addFastQualifiers(Qualifiers::Restrict);
855 }
856 QualType withRestrict() const {
857 return withFastQualifiers(Qualifiers::Restrict);
858 }
859
860 QualType withCVRQualifiers(unsigned CVR) const {
861 return withFastQualifiers(CVR);
862 }
863
864 void addFastQualifiers(unsigned TQs) {
865 assert(!(TQs & ~Qualifiers::FastMask)((void)0)
866 && "non-fast qualifier bits set in mask!")((void)0);
867 Value.setInt(Value.getInt() | TQs);
868 }
869
870 void removeLocalConst();
871 void removeLocalVolatile();
872 void removeLocalRestrict();
873 void removeLocalCVRQualifiers(unsigned Mask);
874
875 void removeLocalFastQualifiers() { Value.setInt(0); }
876 void removeLocalFastQualifiers(unsigned Mask) {
877 assert(!(Mask & ~Qualifiers::FastMask) && "mask has non-fast qualifiers")((void)0);
878 Value.setInt(Value.getInt() & ~Mask);
879 }
880
881 // Creates a type with the given qualifiers in addition to any
882 // qualifiers already on this type.
883 QualType withFastQualifiers(unsigned TQs) const {
884 QualType T = *this;
885 T.addFastQualifiers(TQs);
886 return T;
887 }
888
889 // Creates a type with exactly the given fast qualifiers, removing
890 // any existing fast qualifiers.
891 QualType withExactLocalFastQualifiers(unsigned TQs) const {
892 return withoutLocalFastQualifiers().withFastQualifiers(TQs);
893 }
894
895 // Removes fast qualifiers, but leaves any extended qualifiers in place.
896 QualType withoutLocalFastQualifiers() const {
897 QualType T = *this;
898 T.removeLocalFastQualifiers();
899 return T;
900 }
901
902 QualType getCanonicalType() const;
903
904 /// Return this type with all of the instance-specific qualifiers
905 /// removed, but without removing any qualifiers that may have been applied
906 /// through typedefs.
907 QualType getLocalUnqualifiedType() const { return QualType(getTypePtr(), 0); }
908
909 /// Retrieve the unqualified variant of the given type,
910 /// removing as little sugar as possible.
911 ///
912 /// This routine looks through various kinds of sugar to find the
913 /// least-desugared type that is unqualified. For example, given:
914 ///
915 /// \code
916 /// typedef int Integer;
917 /// typedef const Integer CInteger;
918 /// typedef CInteger DifferenceType;
919 /// \endcode
920 ///
921 /// Executing \c getUnqualifiedType() on the type \c DifferenceType will
922 /// desugar until we hit the type \c Integer, which has no qualifiers on it.
923 ///
924 /// The resulting type might still be qualified if it's sugar for an array
925 /// type. To strip qualifiers even from within a sugared array type, use
926 /// ASTContext::getUnqualifiedArrayType.
927 inline QualType getUnqualifiedType() const;
928
929 /// Retrieve the unqualified variant of the given type, removing as little
930 /// sugar as possible.
931 ///
932 /// Like getUnqualifiedType(), but also returns the set of
933 /// qualifiers that were built up.
934 ///
935 /// The resulting type might still be qualified if it's sugar for an array
936 /// type. To strip qualifiers even from within a sugared array type, use
937 /// ASTContext::getUnqualifiedArrayType.
938 inline SplitQualType getSplitUnqualifiedType() const;
939
940 /// Determine whether this type is more qualified than the other
941 /// given type, requiring exact equality for non-CVR qualifiers.
942 bool isMoreQualifiedThan(QualType Other) const;
943
944 /// Determine whether this type is at least as qualified as the other
945 /// given type, requiring exact equality for non-CVR qualifiers.
946 bool isAtLeastAsQualifiedAs(QualType Other) const;
947
948 QualType getNonReferenceType() const;
949
950 /// Determine the type of a (typically non-lvalue) expression with the
951 /// specified result type.
952 ///
953 /// This routine should be used for expressions for which the return type is
954 /// explicitly specified (e.g., in a cast or call) and isn't necessarily
955 /// an lvalue. It removes a top-level reference (since there are no
956 /// expressions of reference type) and deletes top-level cvr-qualifiers
957 /// from non-class types (in C++) or all types (in C).
958 QualType getNonLValueExprType(const ASTContext &Context) const;
959
960 /// Remove an outer pack expansion type (if any) from this type. Used as part
961 /// of converting the type of a declaration to the type of an expression that
962 /// references that expression. It's meaningless for an expression to have a
963 /// pack expansion type.
964 QualType getNonPackExpansionType() const;
965
966 /// Return the specified type with any "sugar" removed from
967 /// the type. This takes off typedefs, typeof's etc. If the outer level of
968 /// the type is already concrete, it returns it unmodified. This is similar
969 /// to getting the canonical type, but it doesn't remove *all* typedefs. For
970 /// example, it returns "T*" as "T*", (not as "int*"), because the pointer is
971 /// concrete.
972 ///
973 /// Qualifiers are left in place.
974 QualType getDesugaredType(const ASTContext &Context) const {
975 return getDesugaredType(*this, Context);
976 }
977
978 SplitQualType getSplitDesugaredType() const {
979 return getSplitDesugaredType(*this);
980 }
981
982 /// Return the specified type with one level of "sugar" removed from
983 /// the type.
984 ///
985 /// This routine takes off the first typedef, typeof, etc. If the outer level
986 /// of the type is already concrete, it returns it unmodified.
987 QualType getSingleStepDesugaredType(const ASTContext &Context) const {
988 return getSingleStepDesugaredTypeImpl(*this, Context);
989 }
990
991 /// Returns the specified type after dropping any
992 /// outer-level parentheses.
993 QualType IgnoreParens() const {
994 if (isa<ParenType>(*this))
995 return QualType::IgnoreParens(*this);
996 return *this;
997 }
998
999 /// Indicate whether the specified types and qualifiers are identical.
1000 friend bool operator==(const QualType &LHS, const QualType &RHS) {
1001 return LHS.Value == RHS.Value;
1002 }
1003 friend bool operator!=(const QualType &LHS, const QualType &RHS) {
1004 return LHS.Value != RHS.Value;
1005 }
1006 friend bool operator<(const QualType &LHS, const QualType &RHS) {
1007 return LHS.Value < RHS.Value;
1008 }
1009
1010 static std::string getAsString(SplitQualType split,
1011 const PrintingPolicy &Policy) {
1012 return getAsString(split.Ty, split.Quals, Policy);
1013 }
1014 static std::string getAsString(const Type *ty, Qualifiers qs,
1015 const PrintingPolicy &Policy);
1016
1017 std::string getAsString() const;
1018 std::string getAsString(const PrintingPolicy &Policy) const;
1019
1020 void print(raw_ostream &OS, const PrintingPolicy &Policy,
1021 const Twine &PlaceHolder = Twine(),
1022 unsigned Indentation = 0) const;
1023
1024 static void print(SplitQualType split, raw_ostream &OS,
1025 const PrintingPolicy &policy, const Twine &PlaceHolder,
1026 unsigned Indentation = 0) {
1027 return print(split.Ty, split.Quals, OS, policy, PlaceHolder, Indentation);
1028 }
1029
1030 static void print(const Type *ty, Qualifiers qs,
1031 raw_ostream &OS, const PrintingPolicy &policy,
1032 const Twine &PlaceHolder,
1033 unsigned Indentation = 0);
1034
1035 void getAsStringInternal(std::string &Str,
1036 const PrintingPolicy &Policy) const;
1037
1038 static void getAsStringInternal(SplitQualType split, std::string &out,
1039 const PrintingPolicy &policy) {
1040 return getAsStringInternal(split.Ty, split.Quals, out, policy);
1041 }
1042
1043 static void getAsStringInternal(const Type *ty, Qualifiers qs,
1044 std::string &out,
1045 const PrintingPolicy &policy);
1046
1047 class StreamedQualTypeHelper {
1048 const QualType &T;
1049 const PrintingPolicy &Policy;
1050 const Twine &PlaceHolder;
1051 unsigned Indentation;
1052
1053 public:
1054 StreamedQualTypeHelper(const QualType &T, const PrintingPolicy &Policy,
1055 const Twine &PlaceHolder, unsigned Indentation)
1056 : T(T), Policy(Policy), PlaceHolder(PlaceHolder),
1057 Indentation(Indentation) {}
1058
1059 friend raw_ostream &operator<<(raw_ostream &OS,
1060 const StreamedQualTypeHelper &SQT) {
1061 SQT.T.print(OS, SQT.Policy, SQT.PlaceHolder, SQT.Indentation);
1062 return OS;
1063 }
1064 };
1065
1066 StreamedQualTypeHelper stream(const PrintingPolicy &Policy,
1067 const Twine &PlaceHolder = Twine(),
1068 unsigned Indentation = 0) const {
1069 return StreamedQualTypeHelper(*this, Policy, PlaceHolder, Indentation);
1070 }
1071
1072 void dump(const char *s) const;
1073 void dump() const;
1074 void dump(llvm::raw_ostream &OS, const ASTContext &Context) const;
1075
1076 void Profile(llvm::FoldingSetNodeID &ID) const {
1077 ID.AddPointer(getAsOpaquePtr());
1078 }
1079
1080 /// Check if this type has any address space qualifier.
1081 inline bool hasAddressSpace() const;
1082
1083 /// Return the address space of this type.
1084 inline LangAS getAddressSpace() const;
1085
1086 /// Returns true if address space qualifiers overlap with T address space
1087 /// qualifiers.
1088 /// OpenCL C defines conversion rules for pointers to different address spaces
1089 /// and notion of overlapping address spaces.
1090 /// CL1.1 or CL1.2:
1091 /// address spaces overlap iff they are they same.
1092 /// OpenCL C v2.0 s6.5.5 adds:
1093 /// __generic overlaps with any address space except for __constant.
1094 bool isAddressSpaceOverlapping(QualType T) const {
1095 Qualifiers Q = getQualifiers();
1096 Qualifiers TQ = T.getQualifiers();
1097 // Address spaces overlap if at least one of them is a superset of another
1098 return Q.isAddressSpaceSupersetOf(TQ) || TQ.isAddressSpaceSupersetOf(Q);
1099 }
1100
1101 /// Returns gc attribute of this type.
1102 inline Qualifiers::GC getObjCGCAttr() const;
1103
1104 /// true when Type is objc's weak.
1105 bool isObjCGCWeak() const {
1106 return getObjCGCAttr() == Qualifiers::Weak;
1107 }
1108
1109 /// true when Type is objc's strong.
1110 bool isObjCGCStrong() const {
1111 return getObjCGCAttr() == Qualifiers::Strong;
1112 }
1113
1114 /// Returns lifetime attribute of this type.
1115 Qualifiers::ObjCLifetime getObjCLifetime() const {
1116 return getQualifiers().getObjCLifetime();
1117 }
1118
1119 bool hasNonTrivialObjCLifetime() const {
1120 return getQualifiers().hasNonTrivialObjCLifetime();
1121 }
1122
1123 bool hasStrongOrWeakObjCLifetime() const {
1124 return getQualifiers().hasStrongOrWeakObjCLifetime();
1125 }
1126
1127 // true when Type is objc's weak and weak is enabled but ARC isn't.
1128 bool isNonWeakInMRRWithObjCWeak(const ASTContext &Context) const;
1129
1130 enum PrimitiveDefaultInitializeKind {
1131 /// The type does not fall into any of the following categories. Note that
1132 /// this case is zero-valued so that values of this enum can be used as a
1133 /// boolean condition for non-triviality.
1134 PDIK_Trivial,
1135
1136 /// The type is an Objective-C retainable pointer type that is qualified
1137 /// with the ARC __strong qualifier.
1138 PDIK_ARCStrong,
1139
1140 /// The type is an Objective-C retainable pointer type that is qualified
1141 /// with the ARC __weak qualifier.
1142 PDIK_ARCWeak,
1143
1144 /// The type is a struct containing a field whose type is not PCK_Trivial.
1145 PDIK_Struct
1146 };
1147
1148 /// Functions to query basic properties of non-trivial C struct types.
1149
1150 /// Check if this is a non-trivial type that would cause a C struct
1151 /// transitively containing this type to be non-trivial to default initialize
1152 /// and return the kind.
1153 PrimitiveDefaultInitializeKind
1154 isNonTrivialToPrimitiveDefaultInitialize() const;
1155
1156 enum PrimitiveCopyKind {
1157 /// The type does not fall into any of the following categories. Note that
1158 /// this case is zero-valued so that values of this enum can be used as a
1159 /// boolean condition for non-triviality.
1160 PCK_Trivial,
1161
1162 /// The type would be trivial except that it is volatile-qualified. Types
1163 /// that fall into one of the other non-trivial cases may additionally be
1164 /// volatile-qualified.
1165 PCK_VolatileTrivial,
1166
1167 /// The type is an Objective-C retainable pointer type that is qualified
1168 /// with the ARC __strong qualifier.
1169 PCK_ARCStrong,
1170
1171 /// The type is an Objective-C retainable pointer type that is qualified
1172 /// with the ARC __weak qualifier.
1173 PCK_ARCWeak,
1174
1175 /// The type is a struct containing a field whose type is neither
1176 /// PCK_Trivial nor PCK_VolatileTrivial.
1177 /// Note that a C++ struct type does not necessarily match this; C++ copying
1178 /// semantics are too complex to express here, in part because they depend
1179 /// on the exact constructor or assignment operator that is chosen by
1180 /// overload resolution to do the copy.
1181 PCK_Struct
1182 };
1183
1184 /// Check if this is a non-trivial type that would cause a C struct
1185 /// transitively containing this type to be non-trivial to copy and return the
1186 /// kind.
1187 PrimitiveCopyKind isNonTrivialToPrimitiveCopy() const;
1188
1189 /// Check if this is a non-trivial type that would cause a C struct
1190 /// transitively containing this type to be non-trivial to destructively
1191 /// move and return the kind. Destructive move in this context is a C++-style
1192 /// move in which the source object is placed in a valid but unspecified state
1193 /// after it is moved, as opposed to a truly destructive move in which the
1194 /// source object is placed in an uninitialized state.
1195 PrimitiveCopyKind isNonTrivialToPrimitiveDestructiveMove() const;
1196
1197 enum DestructionKind {
1198 DK_none,
1199 DK_cxx_destructor,
1200 DK_objc_strong_lifetime,
1201 DK_objc_weak_lifetime,
1202 DK_nontrivial_c_struct
1203 };
1204
1205 /// Returns a nonzero value if objects of this type require
1206 /// non-trivial work to clean up after. Non-zero because it's
1207 /// conceivable that qualifiers (objc_gc(weak)?) could make
1208 /// something require destruction.
1209 DestructionKind isDestructedType() const {
1210 return isDestructedTypeImpl(*this);
1211 }
1212
1213 /// Check if this is or contains a C union that is non-trivial to
1214 /// default-initialize, which is a union that has a member that is non-trivial
1215 /// to default-initialize. If this returns true,
1216 /// isNonTrivialToPrimitiveDefaultInitialize returns PDIK_Struct.
1217 bool hasNonTrivialToPrimitiveDefaultInitializeCUnion() const;
1218
1219 /// Check if this is or contains a C union that is non-trivial to destruct,
1220 /// which is a union that has a member that is non-trivial to destruct. If
1221 /// this returns true, isDestructedType returns DK_nontrivial_c_struct.
1222 bool hasNonTrivialToPrimitiveDestructCUnion() const;
1223
1224 /// Check if this is or contains a C union that is non-trivial to copy, which
1225 /// is a union that has a member that is non-trivial to copy. If this returns
1226 /// true, isNonTrivialToPrimitiveCopy returns PCK_Struct.
1227 bool hasNonTrivialToPrimitiveCopyCUnion() const;
1228
1229 /// Determine whether expressions of the given type are forbidden
1230 /// from being lvalues in C.
1231 ///
1232 /// The expression types that are forbidden to be lvalues are:
1233 /// - 'void', but not qualified void
1234 /// - function types
1235 ///
1236 /// The exact rule here is C99 6.3.2.1:
1237 /// An lvalue is an expression with an object type or an incomplete
1238 /// type other than void.
1239 bool isCForbiddenLValueType() const;
1240
1241 /// Substitute type arguments for the Objective-C type parameters used in the
1242 /// subject type.
1243 ///
1244 /// \param ctx ASTContext in which the type exists.
1245 ///
1246 /// \param typeArgs The type arguments that will be substituted for the
1247 /// Objective-C type parameters in the subject type, which are generally
1248 /// computed via \c Type::getObjCSubstitutions. If empty, the type
1249 /// parameters will be replaced with their bounds or id/Class, as appropriate
1250 /// for the context.
1251 ///
1252 /// \param context The context in which the subject type was written.
1253 ///
1254 /// \returns the resulting type.
1255 QualType substObjCTypeArgs(ASTContext &ctx,
1256 ArrayRef<QualType> typeArgs,
1257 ObjCSubstitutionContext context) const;
1258
1259 /// Substitute type arguments from an object type for the Objective-C type
1260 /// parameters used in the subject type.
1261 ///
1262 /// This operation combines the computation of type arguments for
1263 /// substitution (\c Type::getObjCSubstitutions) with the actual process of
1264 /// substitution (\c QualType::substObjCTypeArgs) for the convenience of
1265 /// callers that need to perform a single substitution in isolation.
1266 ///
1267 /// \param objectType The type of the object whose member type we're
1268 /// substituting into. For example, this might be the receiver of a message
1269 /// or the base of a property access.
1270 ///
1271 /// \param dc The declaration context from which the subject type was
1272 /// retrieved, which indicates (for example) which type parameters should
1273 /// be substituted.
1274 ///
1275 /// \param context The context in which the subject type was written.
1276 ///
1277 /// \returns the subject type after replacing all of the Objective-C type
1278 /// parameters with their corresponding arguments.
1279 QualType substObjCMemberType(QualType objectType,
1280 const DeclContext *dc,
1281 ObjCSubstitutionContext context) const;
1282
1283 /// Strip Objective-C "__kindof" types from the given type.
1284 QualType stripObjCKindOfType(const ASTContext &ctx) const;
1285
1286 /// Remove all qualifiers including _Atomic.
1287 QualType getAtomicUnqualifiedType() const;
1288
1289private:
1290 // These methods are implemented in a separate translation unit;
1291 // "static"-ize them to avoid creating temporary QualTypes in the
1292 // caller.
1293 static bool isConstant(QualType T, const ASTContext& Ctx);
1294 static QualType getDesugaredType(QualType T, const ASTContext &Context);
1295 static SplitQualType getSplitDesugaredType(QualType T);
1296 static SplitQualType getSplitUnqualifiedTypeImpl(QualType type);
1297 static QualType getSingleStepDesugaredTypeImpl(QualType type,
1298 const ASTContext &C);
1299 static QualType IgnoreParens(QualType T);
1300 static DestructionKind isDestructedTypeImpl(QualType type);
1301
1302 /// Check if \param RD is or contains a non-trivial C union.
1303 static bool hasNonTrivialToPrimitiveDefaultInitializeCUnion(const RecordDecl *RD);
1304 static bool hasNonTrivialToPrimitiveDestructCUnion(const RecordDecl *RD);
1305 static bool hasNonTrivialToPrimitiveCopyCUnion(const RecordDecl *RD);
1306};
1307
1308} // namespace clang
1309
1310namespace llvm {
1311
1312/// Implement simplify_type for QualType, so that we can dyn_cast from QualType
1313/// to a specific Type class.
1314template<> struct simplify_type< ::clang::QualType> {
1315 using SimpleType = const ::clang::Type *;
1316
1317 static SimpleType getSimplifiedValue(::clang::QualType Val) {
1318 return Val.getTypePtr();
1319 }
1320};
1321
1322// Teach SmallPtrSet that QualType is "basically a pointer".
1323template<>
1324struct PointerLikeTypeTraits<clang::QualType> {
1325 static inline void *getAsVoidPointer(clang::QualType P) {
1326 return P.getAsOpaquePtr();
1327 }
1328
1329 static inline clang::QualType getFromVoidPointer(void *P) {
1330 return clang::QualType::getFromOpaquePtr(P);
1331 }
1332
1333 // Various qualifiers go in low bits.
1334 static constexpr int NumLowBitsAvailable = 0;
1335};
1336
1337} // namespace llvm
1338
1339namespace clang {
1340
1341/// Base class that is common to both the \c ExtQuals and \c Type
1342/// classes, which allows \c QualType to access the common fields between the
1343/// two.
1344class ExtQualsTypeCommonBase {
1345 friend class ExtQuals;
1346 friend class QualType;
1347 friend class Type;
1348
1349 /// The "base" type of an extended qualifiers type (\c ExtQuals) or
1350 /// a self-referential pointer (for \c Type).
1351 ///
1352 /// This pointer allows an efficient mapping from a QualType to its
1353 /// underlying type pointer.
1354 const Type *const BaseType;
1355
1356 /// The canonical type of this type. A QualType.
1357 QualType CanonicalType;
1358
1359 ExtQualsTypeCommonBase(const Type *baseType, QualType canon)
1360 : BaseType(baseType), CanonicalType(canon) {}
1361};
1362
1363/// We can encode up to four bits in the low bits of a
1364/// type pointer, but there are many more type qualifiers that we want
1365/// to be able to apply to an arbitrary type. Therefore we have this
1366/// struct, intended to be heap-allocated and used by QualType to
1367/// store qualifiers.
1368///
1369/// The current design tags the 'const', 'restrict', and 'volatile' qualifiers
1370/// in three low bits on the QualType pointer; a fourth bit records whether
1371/// the pointer is an ExtQuals node. The extended qualifiers (address spaces,
1372/// Objective-C GC attributes) are much more rare.
1373class ExtQuals : public ExtQualsTypeCommonBase, public llvm::FoldingSetNode {
1374 // NOTE: changing the fast qualifiers should be straightforward as
1375 // long as you don't make 'const' non-fast.
1376 // 1. Qualifiers:
1377 // a) Modify the bitmasks (Qualifiers::TQ and DeclSpec::TQ).
1378 // Fast qualifiers must occupy the low-order bits.
1379 // b) Update Qualifiers::FastWidth and FastMask.
1380 // 2. QualType:
1381 // a) Update is{Volatile,Restrict}Qualified(), defined inline.
1382 // b) Update remove{Volatile,Restrict}, defined near the end of
1383 // this header.
1384 // 3. ASTContext:
1385 // a) Update get{Volatile,Restrict}Type.
1386
1387 /// The immutable set of qualifiers applied by this node. Always contains
1388 /// extended qualifiers.
1389 Qualifiers Quals;
1390
1391 ExtQuals *this_() { return this; }
1392
1393public:
1394 ExtQuals(const Type *baseType, QualType canon, Qualifiers quals)
1395 : ExtQualsTypeCommonBase(baseType,
1396 canon.isNull() ? QualType(this_(), 0) : canon),
1397 Quals(quals) {
1398 assert(Quals.hasNonFastQualifiers()((void)0)
1399 && "ExtQuals created with no fast qualifiers")((void)0);
1400 assert(!Quals.hasFastQualifiers()((void)0)
1401 && "ExtQuals created with fast qualifiers")((void)0);
1402 }
1403
1404 Qualifiers getQualifiers() const { return Quals; }
1405
1406 bool hasObjCGCAttr() const { return Quals.hasObjCGCAttr(); }
1407 Qualifiers::GC getObjCGCAttr() const { return Quals.getObjCGCAttr(); }
1408
1409 bool hasObjCLifetime() const { return Quals.hasObjCLifetime(); }
1410 Qualifiers::ObjCLifetime getObjCLifetime() const {
1411 return Quals.getObjCLifetime();
1412 }
1413
1414 bool hasAddressSpace() const { return Quals.hasAddressSpace(); }
1415 LangAS getAddressSpace() const { return Quals.getAddressSpace(); }
1416
1417 const Type *getBaseType() const { return BaseType; }
1418
1419public:
1420 void Profile(llvm::FoldingSetNodeID &ID) const {
1421 Profile(ID, getBaseType(), Quals);
1422 }
1423
1424 static void Profile(llvm::FoldingSetNodeID &ID,
1425 const Type *BaseType,
1426 Qualifiers Quals) {
1427 assert(!Quals.hasFastQualifiers() && "fast qualifiers in ExtQuals hash!")((void)0);
1428 ID.AddPointer(BaseType);
1429 Quals.Profile(ID);
1430 }
1431};
1432
1433/// The kind of C++11 ref-qualifier associated with a function type.
1434/// This determines whether a member function's "this" object can be an
1435/// lvalue, rvalue, or neither.
1436enum RefQualifierKind {
1437 /// No ref-qualifier was provided.
1438 RQ_None = 0,
1439
1440 /// An lvalue ref-qualifier was provided (\c &).
1441 RQ_LValue,
1442
1443 /// An rvalue ref-qualifier was provided (\c &&).
1444 RQ_RValue
1445};
1446
1447/// Which keyword(s) were used to create an AutoType.
1448enum class AutoTypeKeyword {
1449 /// auto
1450 Auto,
1451
1452 /// decltype(auto)
1453 DecltypeAuto,
1454
1455 /// __auto_type (GNU extension)
1456 GNUAutoType
1457};
1458
1459/// The base class of the type hierarchy.
1460///
1461/// A central concept with types is that each type always has a canonical
1462/// type. A canonical type is the type with any typedef names stripped out
1463/// of it or the types it references. For example, consider:
1464///
1465/// typedef int foo;
1466/// typedef foo* bar;
1467/// 'int *' 'foo *' 'bar'
1468///
1469/// There will be a Type object created for 'int'. Since int is canonical, its
1470/// CanonicalType pointer points to itself. There is also a Type for 'foo' (a
1471/// TypedefType). Its CanonicalType pointer points to the 'int' Type. Next
1472/// there is a PointerType that represents 'int*', which, like 'int', is
1473/// canonical. Finally, there is a PointerType type for 'foo*' whose canonical
1474/// type is 'int*', and there is a TypedefType for 'bar', whose canonical type
1475/// is also 'int*'.
1476///
1477/// Non-canonical types are useful for emitting diagnostics, without losing
1478/// information about typedefs being used. Canonical types are useful for type
1479/// comparisons (they allow by-pointer equality tests) and useful for reasoning
1480/// about whether something has a particular form (e.g. is a function type),
1481/// because they implicitly, recursively, strip all typedefs out of a type.
1482///
1483/// Types, once created, are immutable.
1484///
1485class alignas(8) Type : public ExtQualsTypeCommonBase {
1486public:
1487 enum TypeClass {
1488#define TYPE(Class, Base) Class,
1489#define LAST_TYPE(Class) TypeLast = Class
1490#define ABSTRACT_TYPE(Class, Base)
1491#include "clang/AST/TypeNodes.inc"
1492 };
1493
1494private:
1495 /// Bitfields required by the Type class.
1496 class TypeBitfields {
1497 friend class Type;
1498 template <class T> friend class TypePropertyCache;
1499
1500 /// TypeClass bitfield - Enum that specifies what subclass this belongs to.
1501 unsigned TC : 8;
1502
1503 /// Store information on the type dependency.
1504 unsigned Dependence : llvm::BitWidth<TypeDependence>;
1505
1506 /// True if the cache (i.e. the bitfields here starting with
1507 /// 'Cache') is valid.
1508 mutable unsigned CacheValid : 1;
1509
1510 /// Linkage of this type.
1511 mutable unsigned CachedLinkage : 3;
1512
1513 /// Whether this type involves and local or unnamed types.
1514 mutable unsigned CachedLocalOrUnnamed : 1;
1515
1516 /// Whether this type comes from an AST file.
1517 mutable unsigned FromAST : 1;
1518
1519 bool isCacheValid() const {
1520 return CacheValid;
1521 }
1522
1523 Linkage getLinkage() const {
1524 assert(isCacheValid() && "getting linkage from invalid cache")((void)0);
1525 return static_cast<Linkage>(CachedLinkage);
1526 }
1527
1528 bool hasLocalOrUnnamedType() const {
1529 assert(isCacheValid() && "getting linkage from invalid cache")((void)0);
1530 return CachedLocalOrUnnamed;
1531 }
1532 };
1533 enum { NumTypeBits = 8 + llvm::BitWidth<TypeDependence> + 6 };
1534
1535protected:
1536 // These classes allow subclasses to somewhat cleanly pack bitfields
1537 // into Type.
1538
1539 class ArrayTypeBitfields {
1540 friend class ArrayType;
1541
1542 unsigned : NumTypeBits;
1543
1544 /// CVR qualifiers from declarations like
1545 /// 'int X[static restrict 4]'. For function parameters only.
1546 unsigned IndexTypeQuals : 3;
1547
1548 /// Storage class qualifiers from declarations like
1549 /// 'int X[static restrict 4]'. For function parameters only.
1550 /// Actually an ArrayType::ArraySizeModifier.
1551 unsigned SizeModifier : 3;
1552 };
1553
1554 class ConstantArrayTypeBitfields {
1555 friend class ConstantArrayType;
1556
1557 unsigned : NumTypeBits + 3 + 3;
1558
1559 /// Whether we have a stored size expression.
1560 unsigned HasStoredSizeExpr : 1;
1561 };
1562
1563 class BuiltinTypeBitfields {
1564 friend class BuiltinType;
1565
1566 unsigned : NumTypeBits;
1567
1568 /// The kind (BuiltinType::Kind) of builtin type this is.
1569 unsigned Kind : 8;
1570 };
1571
1572 /// FunctionTypeBitfields store various bits belonging to FunctionProtoType.
1573 /// Only common bits are stored here. Additional uncommon bits are stored
1574 /// in a trailing object after FunctionProtoType.
1575 class FunctionTypeBitfields {
1576 friend class FunctionProtoType;
1577 friend class FunctionType;
1578
1579 unsigned : NumTypeBits;
1580
1581 /// Extra information which affects how the function is called, like
1582 /// regparm and the calling convention.
1583 unsigned ExtInfo : 13;
1584
1585 /// The ref-qualifier associated with a \c FunctionProtoType.
1586 ///
1587 /// This is a value of type \c RefQualifierKind.
1588 unsigned RefQualifier : 2;
1589
1590 /// Used only by FunctionProtoType, put here to pack with the
1591 /// other bitfields.
1592 /// The qualifiers are part of FunctionProtoType because...
1593 ///
1594 /// C++ 8.3.5p4: The return type, the parameter type list and the
1595 /// cv-qualifier-seq, [...], are part of the function type.
1596 unsigned FastTypeQuals : Qualifiers::FastWidth;
1597 /// Whether this function has extended Qualifiers.
1598 unsigned HasExtQuals : 1;
1599
1600 /// The number of parameters this function has, not counting '...'.
1601 /// According to [implimits] 8 bits should be enough here but this is
1602 /// somewhat easy to exceed with metaprogramming and so we would like to
1603 /// keep NumParams as wide as reasonably possible.
1604 unsigned NumParams : 16;
1605
1606 /// The type of exception specification this function has.
1607 unsigned ExceptionSpecType : 4;
1608
1609 /// Whether this function has extended parameter information.
1610 unsigned HasExtParameterInfos : 1;
1611
1612 /// Whether the function is variadic.
1613 unsigned Variadic : 1;
1614
1615 /// Whether this function has a trailing return type.
1616 unsigned HasTrailingReturn : 1;
1617 };
1618
1619 class ObjCObjectTypeBitfields {
1620 friend class ObjCObjectType;
1621
1622 unsigned : NumTypeBits;
1623
1624 /// The number of type arguments stored directly on this object type.
1625 unsigned NumTypeArgs : 7;
1626
1627 /// The number of protocols stored directly on this object type.
1628 unsigned NumProtocols : 6;
1629
1630 /// Whether this is a "kindof" type.
1631 unsigned IsKindOf : 1;
1632 };
1633
1634 class ReferenceTypeBitfields {
1635 friend class ReferenceType;
1636
1637 unsigned : NumTypeBits;
1638
1639 /// True if the type was originally spelled with an lvalue sigil.
1640 /// This is never true of rvalue references but can also be false
1641 /// on lvalue references because of C++0x [dcl.typedef]p9,
1642 /// as follows:
1643 ///
1644 /// typedef int &ref; // lvalue, spelled lvalue
1645 /// typedef int &&rvref; // rvalue
1646 /// ref &a; // lvalue, inner ref, spelled lvalue
1647 /// ref &&a; // lvalue, inner ref
1648 /// rvref &a; // lvalue, inner ref, spelled lvalue
1649 /// rvref &&a; // rvalue, inner ref
1650 unsigned SpelledAsLValue : 1;
1651
1652 /// True if the inner type is a reference type. This only happens
1653 /// in non-canonical forms.
1654 unsigned InnerRef : 1;
1655 };
1656
1657 class TypeWithKeywordBitfields {
1658 friend class TypeWithKeyword;
1659
1660 unsigned : NumTypeBits;
1661
1662 /// An ElaboratedTypeKeyword. 8 bits for efficient access.
1663 unsigned Keyword : 8;
1664 };
1665
1666 enum { NumTypeWithKeywordBits = 8 };
1667
1668 class ElaboratedTypeBitfields {
1669 friend class ElaboratedType;
1670
1671 unsigned : NumTypeBits;
1672 unsigned : NumTypeWithKeywordBits;
1673
1674 /// Whether the ElaboratedType has a trailing OwnedTagDecl.
1675 unsigned HasOwnedTagDecl : 1;
1676 };
1677
1678 class VectorTypeBitfields {
1679 friend class VectorType;
1680 friend class DependentVectorType;
1681
1682 unsigned : NumTypeBits;
1683
1684 /// The kind of vector, either a generic vector type or some
1685 /// target-specific vector type such as for AltiVec or Neon.
1686 unsigned VecKind : 3;
1687 /// The number of elements in the vector.
1688 uint32_t NumElements;
1689 };
1690
1691 class AttributedTypeBitfields {
1692 friend class AttributedType;
1693
1694 unsigned : NumTypeBits;
1695
1696 /// An AttributedType::Kind
1697 unsigned AttrKind : 32 - NumTypeBits;
1698 };
1699
1700 class AutoTypeBitfields {
1701 friend class AutoType;
1702
1703 unsigned : NumTypeBits;
1704
1705 /// Was this placeholder type spelled as 'auto', 'decltype(auto)',
1706 /// or '__auto_type'? AutoTypeKeyword value.
1707 unsigned Keyword : 2;
1708
1709 /// The number of template arguments in the type-constraints, which is
1710 /// expected to be able to hold at least 1024 according to [implimits].
1711 /// However as this limit is somewhat easy to hit with template
1712 /// metaprogramming we'd prefer to keep it as large as possible.
1713 /// At the moment it has been left as a non-bitfield since this type
1714 /// safely fits in 64 bits as an unsigned, so there is no reason to
1715 /// introduce the performance impact of a bitfield.
1716 unsigned NumArgs;
1717 };
1718
1719 class SubstTemplateTypeParmPackTypeBitfields {
1720 friend class SubstTemplateTypeParmPackType;
1721
1722 unsigned : NumTypeBits;
1723
1724 /// The number of template arguments in \c Arguments, which is
1725 /// expected to be able to hold at least 1024 according to [implimits].
1726 /// However as this limit is somewhat easy to hit with template
1727 /// metaprogramming we'd prefer to keep it as large as possible.
1728 /// At the moment it has been left as a non-bitfield since this type
1729 /// safely fits in 64 bits as an unsigned, so there is no reason to
1730 /// introduce the performance impact of a bitfield.
1731 unsigned NumArgs;
1732 };
1733
1734 class TemplateSpecializationTypeBitfields {
1735 friend class TemplateSpecializationType;
1736
1737 unsigned : NumTypeBits;
1738
1739 /// Whether this template specialization type is a substituted type alias.
1740 unsigned TypeAlias : 1;
1741
1742 /// The number of template arguments named in this class template
1743 /// specialization, which is expected to be able to hold at least 1024
1744 /// according to [implimits]. However, as this limit is somewhat easy to
1745 /// hit with template metaprogramming we'd prefer to keep it as large
1746 /// as possible. At the moment it has been left as a non-bitfield since
1747 /// this type safely fits in 64 bits as an unsigned, so there is no reason
1748 /// to introduce the performance impact of a bitfield.
1749 unsigned NumArgs;
1750 };
1751
1752 class DependentTemplateSpecializationTypeBitfields {
1753 friend class DependentTemplateSpecializationType;
1754
1755 unsigned : NumTypeBits;
1756 unsigned : NumTypeWithKeywordBits;
1757
1758 /// The number of template arguments named in this class template
1759 /// specialization, which is expected to be able to hold at least 1024
1760 /// according to [implimits]. However, as this limit is somewhat easy to
1761 /// hit with template metaprogramming we'd prefer to keep it as large
1762 /// as possible. At the moment it has been left as a non-bitfield since
1763 /// this type safely fits in 64 bits as an unsigned, so there is no reason
1764 /// to introduce the performance impact of a bitfield.
1765 unsigned NumArgs;
1766 };
1767
1768 class PackExpansionTypeBitfields {
1769 friend class PackExpansionType;
1770
1771 unsigned : NumTypeBits;
1772
1773 /// The number of expansions that this pack expansion will
1774 /// generate when substituted (+1), which is expected to be able to
1775 /// hold at least 1024 according to [implimits]. However, as this limit
1776 /// is somewhat easy to hit with template metaprogramming we'd prefer to
1777 /// keep it as large as possible. At the moment it has been left as a
1778 /// non-bitfield since this type safely fits in 64 bits as an unsigned, so
1779 /// there is no reason to introduce the performance impact of a bitfield.
1780 ///
1781 /// This field will only have a non-zero value when some of the parameter
1782 /// packs that occur within the pattern have been substituted but others
1783 /// have not.
1784 unsigned NumExpansions;
1785 };
1786
1787 union {
1788 TypeBitfields TypeBits;
1789 ArrayTypeBitfields ArrayTypeBits;
1790 ConstantArrayTypeBitfields ConstantArrayTypeBits;
1791 AttributedTypeBitfields AttributedTypeBits;
1792 AutoTypeBitfields AutoTypeBits;
1793 BuiltinTypeBitfields BuiltinTypeBits;
1794 FunctionTypeBitfields FunctionTypeBits;
1795 ObjCObjectTypeBitfields ObjCObjectTypeBits;
1796 ReferenceTypeBitfields ReferenceTypeBits;
1797 TypeWithKeywordBitfields TypeWithKeywordBits;
1798 ElaboratedTypeBitfields ElaboratedTypeBits;
1799 VectorTypeBitfields VectorTypeBits;
1800 SubstTemplateTypeParmPackTypeBitfields SubstTemplateTypeParmPackTypeBits;
1801 TemplateSpecializationTypeBitfields TemplateSpecializationTypeBits;
1802 DependentTemplateSpecializationTypeBitfields
1803 DependentTemplateSpecializationTypeBits;
1804 PackExpansionTypeBitfields PackExpansionTypeBits;
1805 };
1806
1807private:
1808 template <class T> friend class TypePropertyCache;
1809
1810 /// Set whether this type comes from an AST file.
1811 void setFromAST(bool V = true) const {
1812 TypeBits.FromAST = V;
1813 }
1814
1815protected:
1816 friend class ASTContext;
1817
1818 Type(TypeClass tc, QualType canon, TypeDependence Dependence)
1819 : ExtQualsTypeCommonBase(this,
1820 canon.isNull() ? QualType(this_(), 0) : canon) {
1821 static_assert(sizeof(*this) <= 8 + sizeof(ExtQualsTypeCommonBase),
1822 "changing bitfields changed sizeof(Type)!");
1823 static_assert(alignof(decltype(*this)) % sizeof(void *) == 0,
1824 "Insufficient alignment!");
1825 TypeBits.TC = tc;
1826 TypeBits.Dependence = static_cast<unsigned>(Dependence);
1827 TypeBits.CacheValid = false;
1828 TypeBits.CachedLocalOrUnnamed = false;
1829 TypeBits.CachedLinkage = NoLinkage;
1830 TypeBits.FromAST = false;
1831 }
1832
1833 // silence VC++ warning C4355: 'this' : used in base member initializer list
1834 Type *this_() { return this; }
1835
1836 void setDependence(TypeDependence D) {
1837 TypeBits.Dependence = static_cast<unsigned>(D);
1838 }
1839
1840 void addDependence(TypeDependence D) { setDependence(getDependence() | D); }
1841
1842public:
1843 friend class ASTReader;
1844 friend class ASTWriter;
1845 template <class T> friend class serialization::AbstractTypeReader;
1846 template <class T> friend class serialization::AbstractTypeWriter;
1847
1848 Type(const Type &) = delete;
1849 Type(Type &&) = delete;
1850 Type &operator=(const Type &) = delete;
1851 Type &operator=(Type &&) = delete;
1852
1853 TypeClass getTypeClass() const { return static_cast<TypeClass>(TypeBits.TC); }
1854
1855 /// Whether this type comes from an AST file.
1856 bool isFromAST() const { return TypeBits.FromAST; }
1857
1858 /// Whether this type is or contains an unexpanded parameter
1859 /// pack, used to support C++0x variadic templates.
1860 ///
1861 /// A type that contains a parameter pack shall be expanded by the
1862 /// ellipsis operator at some point. For example, the typedef in the
1863 /// following example contains an unexpanded parameter pack 'T':
1864 ///
1865 /// \code
1866 /// template<typename ...T>
1867 /// struct X {
1868 /// typedef T* pointer_types; // ill-formed; T is a parameter pack.
1869 /// };
1870 /// \endcode
1871 ///
1872 /// Note that this routine does not specify which
1873 bool containsUnexpandedParameterPack() const {
1874 return getDependence() & TypeDependence::UnexpandedPack;
1875 }
1876
1877 /// Determines if this type would be canonical if it had no further
1878 /// qualification.
1879 bool isCanonicalUnqualified() const {
1880 return CanonicalType == QualType(this, 0);
1881 }
1882
1883 /// Pull a single level of sugar off of this locally-unqualified type.
1884 /// Users should generally prefer SplitQualType::getSingleStepDesugaredType()
1885 /// or QualType::getSingleStepDesugaredType(const ASTContext&).
1886 QualType getLocallyUnqualifiedSingleStepDesugaredType() const;
1887
1888 /// As an extension, we classify types as one of "sized" or "sizeless";
1889 /// every type is one or the other. Standard types are all sized;
1890 /// sizeless types are purely an extension.
1891 ///
1892 /// Sizeless types contain data with no specified size, alignment,
1893 /// or layout.
1894 bool isSizelessType() const;
1895 bool isSizelessBuiltinType() const;
1896
1897 /// Determines if this is a sizeless type supported by the
1898 /// 'arm_sve_vector_bits' type attribute, which can be applied to a single
1899 /// SVE vector or predicate, excluding tuple types such as svint32x4_t.
1900 bool isVLSTBuiltinType() const;
1901
1902 /// Returns the representative type for the element of an SVE builtin type.
1903 /// This is used to represent fixed-length SVE vectors created with the
1904 /// 'arm_sve_vector_bits' type attribute as VectorType.
1905 QualType getSveEltType(const ASTContext &Ctx) const;
1906
1907 /// Types are partitioned into 3 broad categories (C99 6.2.5p1):
1908 /// object types, function types, and incomplete types.
1909
1910 /// Return true if this is an incomplete type.
1911 /// A type that can describe objects, but which lacks information needed to
1912 /// determine its size (e.g. void, or a fwd declared struct). Clients of this
1913 /// routine will need to determine if the size is actually required.
1914 ///
1915 /// Def If non-null, and the type refers to some kind of declaration
1916 /// that can be completed (such as a C struct, C++ class, or Objective-C
1917 /// class), will be set to the declaration.
1918 bool isIncompleteType(NamedDecl **Def = nullptr) const;
1919
1920 /// Return true if this is an incomplete or object
1921 /// type, in other words, not a function type.
1922 bool isIncompleteOrObjectType() const {
1923 return !isFunctionType();
1924 }
1925
1926 /// Determine whether this type is an object type.
1927 bool isObjectType() const {
1928 // C++ [basic.types]p8:
1929 // An object type is a (possibly cv-qualified) type that is not a
1930 // function type, not a reference type, and not a void type.
1931 return !isReferenceType() && !isFunctionType() && !isVoidType();
1932 }
1933
1934 /// Return true if this is a literal type
1935 /// (C++11 [basic.types]p10)
1936 bool isLiteralType(const ASTContext &Ctx) const;
1937
1938 /// Determine if this type is a structural type, per C++20 [temp.param]p7.
1939 bool isStructuralType() const;
1940
1941 /// Test if this type is a standard-layout type.
1942 /// (C++0x [basic.type]p9)
1943 bool isStandardLayoutType() const;
1944
1945 /// Helper methods to distinguish type categories. All type predicates
1946 /// operate on the canonical type, ignoring typedefs and qualifiers.
1947
1948 /// Returns true if the type is a builtin type.
1949 bool isBuiltinType() const;
1950
1951 /// Test for a particular builtin type.
1952 bool isSpecificBuiltinType(unsigned K) const;
1953
1954 /// Test for a type which does not represent an actual type-system type but
1955 /// is instead used as a placeholder for various convenient purposes within
1956 /// Clang. All such types are BuiltinTypes.
1957 bool isPlaceholderType() const;
1958 const BuiltinType *getAsPlaceholderType() const;
1959
1960 /// Test for a specific placeholder type.
1961 bool isSpecificPlaceholderType(unsigned K) const;
1962
1963 /// Test for a placeholder type other than Overload; see
1964 /// BuiltinType::isNonOverloadPlaceholderType.
1965 bool isNonOverloadPlaceholderType() const;
1966
1967 /// isIntegerType() does *not* include complex integers (a GCC extension).
1968 /// isComplexIntegerType() can be used to test for complex integers.
1969 bool isIntegerType() const; // C99 6.2.5p17 (int, char, bool, enum)
1970 bool isEnumeralType() const;
1971
1972 /// Determine whether this type is a scoped enumeration type.
1973 bool isScopedEnumeralType() const;
1974 bool isBooleanType() const;
1975 bool isCharType() const;
1976 bool isWideCharType() const;
1977 bool isChar8Type() const;
1978 bool isChar16Type() const;
1979 bool isChar32Type() const;
1980 bool isAnyCharacterType() const;
1981 bool isIntegralType(const ASTContext &Ctx) const;
1982
1983 /// Determine whether this type is an integral or enumeration type.
1984 bool isIntegralOrEnumerationType() const;
1985
1986 /// Determine whether this type is an integral or unscoped enumeration type.
1987 bool isIntegralOrUnscopedEnumerationType() const;
1988 bool isUnscopedEnumerationType() const;
1989
1990 /// Floating point categories.
1991 bool isRealFloatingType() const; // C99 6.2.5p10 (float, double, long double)
1992 /// isComplexType() does *not* include complex integers (a GCC extension).
1993 /// isComplexIntegerType() can be used to test for complex integers.
1994 bool isComplexType() const; // C99 6.2.5p11 (complex)
1995 bool isAnyComplexType() const; // C99 6.2.5p11 (complex) + Complex Int.
1996 bool isFloatingType() const; // C99 6.2.5p11 (real floating + complex)
1997 bool isHalfType() const; // OpenCL 6.1.1.1, NEON (IEEE 754-2008 half)
1998 bool isFloat16Type() const; // C11 extension ISO/IEC TS 18661
1999 bool isBFloat16Type() const;
2000 bool isFloat128Type() const;
2001 bool isRealType() const; // C99 6.2.5p17 (real floating + integer)
2002 bool isArithmeticType() const; // C99 6.2.5p18 (integer + floating)
2003 bool isVoidType() const; // C99 6.2.5p19
2004 bool isScalarType() const; // C99 6.2.5p21 (arithmetic + pointers)
2005 bool isAggregateType() const;
2006 bool isFundamentalType() const;
2007 bool isCompoundType() const;
2008
2009 // Type Predicates: Check to see if this type is structurally the specified
2010 // type, ignoring typedefs and qualifiers.
2011 bool isFunctionType() const;
2012 bool isFunctionNoProtoType() const { return getAs<FunctionNoProtoType>(); }
2013 bool isFunctionProtoType() const { return getAs<FunctionProtoType>(); }
2014 bool isPointerType() const;
2015 bool isAnyPointerType() const; // Any C pointer or ObjC object pointer
2016 bool isBlockPointerType() const;
2017 bool isVoidPointerType() const;
2018 bool isReferenceType() const;
2019 bool isLValueReferenceType() const;
2020 bool isRValueReferenceType() const;
2021 bool isObjectPointerType() const;
2022 bool isFunctionPointerType() const;
2023 bool isFunctionReferenceType() const;
2024 bool isMemberPointerType() const;
2025 bool isMemberFunctionPointerType() const;
2026 bool isMemberDataPointerType() const;
2027 bool isArrayType() const;
2028 bool isConstantArrayType() const;
2029 bool isIncompleteArrayType() const;
2030 bool isVariableArrayType() const;
2031 bool isDependentSizedArrayType() const;
2032 bool isRecordType() const;
2033 bool isClassType() const;
2034 bool isStructureType() const;
2035 bool isObjCBoxableRecordType() const;
2036 bool isInterfaceType() const;
2037 bool isStructureOrClassType() const;
2038 bool isUnionType() const;
2039 bool isComplexIntegerType() const; // GCC _Complex integer type.
2040 bool isVectorType() const; // GCC vector type.
2041 bool isExtVectorType() const; // Extended vector type.
2042 bool isMatrixType() const; // Matrix type.
2043 bool isConstantMatrixType() const; // Constant matrix type.
2044 bool isDependentAddressSpaceType() const; // value-dependent address space qualifier
2045 bool isObjCObjectPointerType() const; // pointer to ObjC object
2046 bool isObjCRetainableType() const; // ObjC object or block pointer
2047 bool isObjCLifetimeType() const; // (array of)* retainable type
2048 bool isObjCIndirectLifetimeType() const; // (pointer to)* lifetime type
2049 bool isObjCNSObjectType() const; // __attribute__((NSObject))
2050 bool isObjCIndependentClassType() const; // __attribute__((objc_independent_class))
2051 // FIXME: change this to 'raw' interface type, so we can used 'interface' type
2052 // for the common case.
2053 bool isObjCObjectType() const; // NSString or typeof(*(id)0)
2054 bool isObjCQualifiedInterfaceType() const; // NSString<foo>
2055 bool isObjCQualifiedIdType() const; // id<foo>
2056 bool isObjCQualifiedClassType() const; // Class<foo>
2057 bool isObjCObjectOrInterfaceType() const;
2058 bool isObjCIdType() const; // id
2059 bool isDecltypeType() const;
2060 /// Was this type written with the special inert-in-ARC __unsafe_unretained
2061 /// qualifier?
2062 ///
2063 /// This approximates the answer to the following question: if this
2064 /// translation unit were compiled in ARC, would this type be qualified
2065 /// with __unsafe_unretained?
2066 bool isObjCInertUnsafeUnretainedType() const {
2067 return hasAttr(attr::ObjCInertUnsafeUnretained);
2068 }
2069
2070 /// Whether the type is Objective-C 'id' or a __kindof type of an
2071 /// object type, e.g., __kindof NSView * or __kindof id
2072 /// <NSCopying>.
2073 ///
2074 /// \param bound Will be set to the bound on non-id subtype types,
2075 /// which will be (possibly specialized) Objective-C class type, or
2076 /// null for 'id.
2077 bool isObjCIdOrObjectKindOfType(const ASTContext &ctx,
2078 const ObjCObjectType *&bound) const;
2079
2080 bool isObjCClassType() const; // Class
2081
2082 /// Whether the type is Objective-C 'Class' or a __kindof type of an
2083 /// Class type, e.g., __kindof Class <NSCopying>.
2084 ///
2085 /// Unlike \c isObjCIdOrObjectKindOfType, there is no relevant bound
2086 /// here because Objective-C's type system cannot express "a class
2087 /// object for a subclass of NSFoo".
2088 bool isObjCClassOrClassKindOfType() const;
2089
2090 bool isBlockCompatibleObjCPointerType(ASTContext &ctx) const;
2091 bool isObjCSelType() const; // Class
2092 bool isObjCBuiltinType() const; // 'id' or 'Class'
2093 bool isObjCARCBridgableType() const;
2094 bool isCARCBridgableType() const;
2095 bool isTemplateTypeParmType() const; // C++ template type parameter
2096 bool isNullPtrType() const; // C++11 std::nullptr_t
2097 bool isNothrowT() const; // C++ std::nothrow_t
2098 bool isAlignValT() const; // C++17 std::align_val_t
2099 bool isStdByteType() const; // C++17 std::byte
2100 bool isAtomicType() const; // C11 _Atomic()
2101 bool isUndeducedAutoType() const; // C++11 auto or
2102 // C++14 decltype(auto)
2103 bool isTypedefNameType() const; // typedef or alias template
2104
2105#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
2106 bool is##Id##Type() const;
2107#include "clang/Basic/OpenCLImageTypes.def"
2108
2109 bool isImageType() const; // Any OpenCL image type
2110
2111 bool isSamplerT() const; // OpenCL sampler_t
2112 bool isEventT() const; // OpenCL event_t
2113 bool isClkEventT() const; // OpenCL clk_event_t
2114 bool isQueueT() const; // OpenCL queue_t
2115 bool isReserveIDT() const; // OpenCL reserve_id_t
2116
2117#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
2118 bool is##Id##Type() const;
2119#include "clang/Basic/OpenCLExtensionTypes.def"
2120 // Type defined in cl_intel_device_side_avc_motion_estimation OpenCL extension
2121 bool isOCLIntelSubgroupAVCType() const;
2122 bool isOCLExtOpaqueType() const; // Any OpenCL extension type
2123
2124 bool isPipeType() const; // OpenCL pipe type
2125 bool isExtIntType() const; // Extended Int Type
2126 bool isOpenCLSpecificType() const; // Any OpenCL specific type
2127
2128 /// Determines if this type, which must satisfy
2129 /// isObjCLifetimeType(), is implicitly __unsafe_unretained rather
2130 /// than implicitly __strong.
2131 bool isObjCARCImplicitlyUnretainedType() const;
2132
2133 /// Check if the type is the CUDA device builtin surface type.
2134 bool isCUDADeviceBuiltinSurfaceType() const;
2135 /// Check if the type is the CUDA device builtin texture type.
2136 bool isCUDADeviceBuiltinTextureType() const;
2137
2138 /// Return the implicit lifetime for this type, which must not be dependent.
2139 Qualifiers::ObjCLifetime getObjCARCImplicitLifetime() const;
2140
2141 enum ScalarTypeKind {
2142 STK_CPointer,
2143 STK_BlockPointer,
2144 STK_ObjCObjectPointer,
2145 STK_MemberPointer,
2146 STK_Bool,
2147 STK_Integral,
2148 STK_Floating,
2149 STK_IntegralComplex,
2150 STK_FloatingComplex,
2151 STK_FixedPoint
2152 };
2153
2154 /// Given that this is a scalar type, classify it.
2155 ScalarTypeKind getScalarTypeKind() const;
2156
2157 TypeDependence getDependence() const {
2158 return static_cast<TypeDependence>(TypeBits.Dependence);
2159 }
2160
2161 /// Whether this type is an error type.
2162 bool containsErrors() const {
2163 return getDependence() & TypeDependence::Error;
2164 }
2165
2166 /// Whether this type is a dependent type, meaning that its definition
2167 /// somehow depends on a template parameter (C++ [temp.dep.type]).
2168 bool isDependentType() const {
2169 return getDependence() & TypeDependence::Dependent;
2170 }
2171
2172 /// Determine whether this type is an instantiation-dependent type,
2173 /// meaning that the type involves a template parameter (even if the
2174 /// definition does not actually depend on the type substituted for that
2175 /// template parameter).
2176 bool isInstantiationDependentType() const {
2177 return getDependence() & TypeDependence::Instantiation;
2178 }
2179
2180 /// Determine whether this type is an undeduced type, meaning that
2181 /// it somehow involves a C++11 'auto' type or similar which has not yet been
2182 /// deduced.
2183 bool isUndeducedType() const;
2184
2185 /// Whether this type is a variably-modified type (C99 6.7.5).
2186 bool isVariablyModifiedType() const {
2187 return getDependence() & TypeDependence::VariablyModified;
2188 }
2189
2190 /// Whether this type involves a variable-length array type
2191 /// with a definite size.
2192 bool hasSizedVLAType() const;
2193
2194 /// Whether this type is or contains a local or unnamed type.
2195 bool hasUnnamedOrLocalType() const;
2196
2197 bool isOverloadableType() const;
2198
2199 /// Determine wither this type is a C++ elaborated-type-specifier.
2200 bool isElaboratedTypeSpecifier() const;
2201
2202 bool canDecayToPointerType() const;
2203
2204 /// Whether this type is represented natively as a pointer. This includes
2205 /// pointers, references, block pointers, and Objective-C interface,
2206 /// qualified id, and qualified interface types, as well as nullptr_t.
2207 bool hasPointerRepresentation() const;
2208
2209 /// Whether this type can represent an objective pointer type for the
2210 /// purpose of GC'ability
2211 bool hasObjCPointerRepresentation() const;
2212
2213 /// Determine whether this type has an integer representation
2214 /// of some sort, e.g., it is an integer type or a vector.
2215 bool hasIntegerRepresentation() const;
2216
2217 /// Determine whether this type has an signed integer representation
2218 /// of some sort, e.g., it is an signed integer type or a vector.
2219 bool hasSignedIntegerRepresentation() const;
2220
2221 /// Determine whether this type has an unsigned integer representation
2222 /// of some sort, e.g., it is an unsigned integer type or a vector.
2223 bool hasUnsignedIntegerRepresentation() const;
2224
2225 /// Determine whether this type has a floating-point representation
2226 /// of some sort, e.g., it is a floating-point type or a vector thereof.
2227 bool hasFloatingRepresentation() const;
2228
2229 // Type Checking Functions: Check to see if this type is structurally the
2230 // specified type, ignoring typedefs and qualifiers, and return a pointer to
2231 // the best type we can.
2232 const RecordType *getAsStructureType() const;
2233 /// NOTE: getAs*ArrayType are methods on ASTContext.
2234 const RecordType *getAsUnionType() const;
2235 const ComplexType *getAsComplexIntegerType() const; // GCC complex int type.
2236 const ObjCObjectType *getAsObjCInterfaceType() const;
2237
2238 // The following is a convenience method that returns an ObjCObjectPointerType
2239 // for object declared using an interface.
2240 const ObjCObjectPointerType *getAsObjCInterfacePointerType() const;
2241 const ObjCObjectPointerType *getAsObjCQualifiedIdType() const;
2242 const ObjCObjectPointerType *getAsObjCQualifiedClassType() const;
2243 const ObjCObjectType *getAsObjCQualifiedInterfaceType() const;
2244
2245 /// Retrieves the CXXRecordDecl that this type refers to, either
2246 /// because the type is a RecordType or because it is the injected-class-name
2247 /// type of a class template or class template partial specialization.
2248 CXXRecordDecl *getAsCXXRecordDecl() const;
2249
2250 /// Retrieves the RecordDecl this type refers to.
2251 RecordDecl *getAsRecordDecl() const;
2252
2253 /// Retrieves the TagDecl that this type refers to, either
2254 /// because the type is a TagType or because it is the injected-class-name
2255 /// type of a class template or class template partial specialization.
2256 TagDecl *getAsTagDecl() const;
2257
2258 /// If this is a pointer or reference to a RecordType, return the
2259 /// CXXRecordDecl that the type refers to.
2260 ///
2261 /// If this is not a pointer or reference, or the type being pointed to does
2262 /// not refer to a CXXRecordDecl, returns NULL.
2263 const CXXRecordDecl *getPointeeCXXRecordDecl() const;
2264
2265 /// Get the DeducedType whose type will be deduced for a variable with
2266 /// an initializer of this type. This looks through declarators like pointer
2267 /// types, but not through decltype or typedefs.
2268 DeducedType *getContainedDeducedType() const;
2269
2270 /// Get the AutoType whose type will be deduced for a variable with
2271 /// an initializer of this type. This looks through declarators like pointer
2272 /// types, but not through decltype or typedefs.
2273 AutoType *getContainedAutoType() const {
2274 return dyn_cast_or_null<AutoType>(getContainedDeducedType());
2275 }
2276
2277 /// Determine whether this type was written with a leading 'auto'
2278 /// corresponding to a trailing return type (possibly for a nested
2279 /// function type within a pointer to function type or similar).
2280 bool hasAutoForTrailingReturnType() const;
2281
2282 /// Member-template getAs<specific type>'. Look through sugar for
2283 /// an instance of \<specific type>. This scheme will eventually
2284 /// replace the specific getAsXXXX methods above.
2285 ///
2286 /// There are some specializations of this member template listed
2287 /// immediately following this class.
2288 template <typename T> const T *getAs() const;
2289
2290 /// Member-template getAsAdjusted<specific type>. Look through specific kinds
2291 /// of sugar (parens, attributes, etc) for an instance of \<specific type>.
2292 /// This is used when you need to walk over sugar nodes that represent some
2293 /// kind of type adjustment from a type that was written as a \<specific type>
2294 /// to another type that is still canonically a \<specific type>.
2295 template <typename T> const T *getAsAdjusted() const;
2296
2297 /// A variant of getAs<> for array types which silently discards
2298 /// qualifiers from the outermost type.
2299 const ArrayType *getAsArrayTypeUnsafe() const;
2300
2301 /// Member-template castAs<specific type>. Look through sugar for
2302 /// the underlying instance of \<specific type>.
2303 ///
2304 /// This method has the same relationship to getAs<T> as cast<T> has
2305 /// to dyn_cast<T>; which is to say, the underlying type *must*
2306 /// have the intended type, and this method will never return null.
2307 template <typename T> const T *castAs() const;
2308
2309 /// A variant of castAs<> for array type which silently discards
2310 /// qualifiers from the outermost type.
2311 const ArrayType *castAsArrayTypeUnsafe() const;
2312
2313 /// Determine whether this type had the specified attribute applied to it
2314 /// (looking through top-level type sugar).
2315 bool hasAttr(attr::Kind AK) const;
2316
2317 /// Get the base element type of this type, potentially discarding type
2318 /// qualifiers. This should never be used when type qualifiers
2319 /// are meaningful.
2320 const Type *getBaseElementTypeUnsafe() const;
2321
2322 /// If this is an array type, return the element type of the array,
2323 /// potentially with type qualifiers missing.
2324 /// This should never be used when type qualifiers are meaningful.
2325 const Type *getArrayElementTypeNoTypeQual() const;
2326
2327 /// If this is a pointer type, return the pointee type.
2328 /// If this is an array type, return the array element type.
2329 /// This should never be used when type qualifiers are meaningful.
2330 const Type *getPointeeOrArrayElementType() const;
2331
2332 /// If this is a pointer, ObjC object pointer, or block
2333 /// pointer, this returns the respective pointee.
2334 QualType getPointeeType() const;
2335
2336 /// Return the specified type with any "sugar" removed from the type,
2337 /// removing any typedefs, typeofs, etc., as well as any qualifiers.
2338 const Type *getUnqualifiedDesugaredType() const;
2339
2340 /// More type predicates useful for type checking/promotion
2341 bool isPromotableIntegerType() const; // C99 6.3.1.1p2
2342
2343 /// Return true if this is an integer type that is
2344 /// signed, according to C99 6.2.5p4 [char, signed char, short, int, long..],
2345 /// or an enum decl which has a signed representation.
2346 bool isSignedIntegerType() const;
2347
2348 /// Return true if this is an integer type that is
2349 /// unsigned, according to C99 6.2.5p6 [which returns true for _Bool],
2350 /// or an enum decl which has an unsigned representation.
2351 bool isUnsignedIntegerType() const;
2352
2353 /// Determines whether this is an integer type that is signed or an
2354 /// enumeration types whose underlying type is a signed integer type.
2355 bool isSignedIntegerOrEnumerationType() const;
2356
2357 /// Determines whether this is an integer type that is unsigned or an
2358 /// enumeration types whose underlying type is a unsigned integer type.
2359 bool isUnsignedIntegerOrEnumerationType() const;
2360
2361 /// Return true if this is a fixed point type according to
2362 /// ISO/IEC JTC1 SC22 WG14 N1169.
2363 bool isFixedPointType() const;
2364
2365 /// Return true if this is a fixed point or integer type.
2366 bool isFixedPointOrIntegerType() const;
2367
2368 /// Return true if this is a saturated fixed point type according to
2369 /// ISO/IEC JTC1 SC22 WG14 N1169. This type can be signed or unsigned.
2370 bool isSaturatedFixedPointType() const;
2371
2372 /// Return true if this is a saturated fixed point type according to
2373 /// ISO/IEC JTC1 SC22 WG14 N1169. This type can be signed or unsigned.
2374 bool isUnsaturatedFixedPointType() const;
2375
2376 /// Return true if this is a fixed point type that is signed according
2377 /// to ISO/IEC JTC1 SC22 WG14 N1169. This type can also be saturated.
2378 bool isSignedFixedPointType() const;
2379
2380 /// Return true if this is a fixed point type that is unsigned according
2381 /// to ISO/IEC JTC1 SC22 WG14 N1169. This type can also be saturated.
2382 bool isUnsignedFixedPointType() const;
2383
2384 /// Return true if this is not a variable sized type,
2385 /// according to the rules of C99 6.7.5p3. It is not legal to call this on
2386 /// incomplete types.
2387 bool isConstantSizeType() const;
2388
2389 /// Returns true if this type can be represented by some
2390 /// set of type specifiers.
2391 bool isSpecifierType() const;
2392
2393 /// Determine the linkage of this type.
2394 Linkage getLinkage() const;
2395
2396 /// Determine the visibility of this type.
2397 Visibility getVisibility() const {
2398 return getLinkageAndVisibility().getVisibility();
2399 }
2400
2401 /// Return true if the visibility was explicitly set is the code.
2402 bool isVisibilityExplicit() const {
2403 return getLinkageAndVisibility().isVisibilityExplicit();
2404 }
2405
2406 /// Determine the linkage and visibility of this type.
2407 LinkageInfo getLinkageAndVisibility() const;
2408
2409 /// True if the computed linkage is valid. Used for consistency
2410 /// checking. Should always return true.
2411 bool isLinkageValid() const;
2412
2413 /// Determine the nullability of the given type.
2414 ///
2415 /// Note that nullability is only captured as sugar within the type
2416 /// system, not as part of the canonical type, so nullability will
2417 /// be lost by canonicalization and desugaring.
2418 Optional<NullabilityKind> getNullability(const ASTContext &context) const;
2419
2420 /// Determine whether the given type can have a nullability
2421 /// specifier applied to it, i.e., if it is any kind of pointer type.
2422 ///
2423 /// \param ResultIfUnknown The value to return if we don't yet know whether
2424 /// this type can have nullability because it is dependent.
2425 bool canHaveNullability(bool ResultIfUnknown = true) const;
2426
2427 /// Retrieve the set of substitutions required when accessing a member
2428 /// of the Objective-C receiver type that is declared in the given context.
2429 ///
2430 /// \c *this is the type of the object we're operating on, e.g., the
2431 /// receiver for a message send or the base of a property access, and is
2432 /// expected to be of some object or object pointer type.
2433 ///
2434 /// \param dc The declaration context for which we are building up a
2435 /// substitution mapping, which should be an Objective-C class, extension,
2436 /// category, or method within.
2437 ///
2438 /// \returns an array of type arguments that can be substituted for
2439 /// the type parameters of the given declaration context in any type described
2440 /// within that context, or an empty optional to indicate that no
2441 /// substitution is required.
2442 Optional<ArrayRef<QualType>>
2443 getObjCSubstitutions(const DeclContext *dc) const;
2444
2445 /// Determines if this is an ObjC interface type that may accept type
2446 /// parameters.
2447 bool acceptsObjCTypeParams() const;
2448
2449 const char *getTypeClassName() const;
2450
2451 QualType getCanonicalTypeInternal() const {
2452 return CanonicalType;
2453 }
2454
2455 CanQualType getCanonicalTypeUnqualified() const; // in CanonicalType.h
2456 void dump() const;
2457 void dump(llvm::raw_ostream &OS, const ASTContext &Context) const;
2458};
2459
2460/// This will check for a TypedefType by removing any existing sugar
2461/// until it reaches a TypedefType or a non-sugared type.
2462template <> const TypedefType *Type::getAs() const;
2463
2464/// This will check for a TemplateSpecializationType by removing any
2465/// existing sugar until it reaches a TemplateSpecializationType or a
2466/// non-sugared type.
2467template <> const TemplateSpecializationType *Type::getAs() const;
2468
2469/// This will check for an AttributedType by removing any existing sugar
2470/// until it reaches an AttributedType or a non-sugared type.
2471template <> const AttributedType *Type::getAs() const;
2472
2473// We can do canonical leaf types faster, because we don't have to
2474// worry about preserving child type decoration.
2475#define TYPE(Class, Base)
2476#define LEAF_TYPE(Class) \
2477template <> inline const Class##Type *Type::getAs() const { \
2478 return dyn_cast<Class##Type>(CanonicalType); \
2479} \
2480template <> inline const Class##Type *Type::castAs() const { \
2481 return cast<Class##Type>(CanonicalType); \
2482}
2483#include "clang/AST/TypeNodes.inc"
2484
2485/// This class is used for builtin types like 'int'. Builtin
2486/// types are always canonical and have a literal name field.
2487class BuiltinType : public Type {
2488public:
2489 enum Kind {
2490// OpenCL image types
2491#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) Id,
2492#include "clang/Basic/OpenCLImageTypes.def"
2493// OpenCL extension types
2494#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) Id,
2495#include "clang/Basic/OpenCLExtensionTypes.def"
2496// SVE Types
2497#define SVE_TYPE(Name, Id, SingletonId) Id,
2498#include "clang/Basic/AArch64SVEACLETypes.def"
2499// PPC MMA Types
2500#define PPC_VECTOR_TYPE(Name, Id, Size) Id,
2501#include "clang/Basic/PPCTypes.def"
2502// RVV Types
2503#define RVV_TYPE(Name, Id, SingletonId) Id,
2504#include "clang/Basic/RISCVVTypes.def"
2505// All other builtin types
2506#define BUILTIN_TYPE(Id, SingletonId) Id,
2507#define LAST_BUILTIN_TYPE(Id) LastKind = Id
2508#include "clang/AST/BuiltinTypes.def"
2509 };
2510
2511private:
2512 friend class ASTContext; // ASTContext creates these.
2513
2514 BuiltinType(Kind K)
2515 : Type(Builtin, QualType(),
2516 K == Dependent ? TypeDependence::DependentInstantiation
2517 : TypeDependence::None) {
2518 BuiltinTypeBits.Kind = K;
2519 }
2520
2521public:
2522 Kind getKind() const { return static_cast<Kind>(BuiltinTypeBits.Kind); }
2523 StringRef getName(const PrintingPolicy &Policy) const;
2524
2525 const char *getNameAsCString(const PrintingPolicy &Policy) const {
2526 // The StringRef is null-terminated.
2527 StringRef str = getName(Policy);
2528 assert(!str.empty() && str.data()[str.size()] == '\0')((void)0);
2529 return str.data();
2530 }
2531
2532 bool isSugared() const { return false; }
2533 QualType desugar() const { return QualType(this, 0); }
2534
2535 bool isInteger() const {
2536 return getKind() >= Bool && getKind() <= Int128;
2537 }
2538
2539 bool isSignedInteger() const {
2540 return getKind() >= Char_S && getKind() <= Int128;
2541 }
2542
2543 bool isUnsignedInteger() const {
2544 return getKind() >= Bool && getKind() <= UInt128;
2545 }
2546
2547 bool isFloatingPoint() const {
2548 return getKind() >= Half && getKind() <= Float128;
2549 }
2550
2551 /// Determines whether the given kind corresponds to a placeholder type.
2552 static bool isPlaceholderTypeKind(Kind K) {
2553 return K >= Overload;
2554 }
2555
2556 /// Determines whether this type is a placeholder type, i.e. a type
2557 /// which cannot appear in arbitrary positions in a fully-formed
2558 /// expression.
2559 bool isPlaceholderType() const {
2560 return isPlaceholderTypeKind(getKind());
2561 }
2562
2563 /// Determines whether this type is a placeholder type other than
2564 /// Overload. Most placeholder types require only syntactic
2565 /// information about their context in order to be resolved (e.g.
2566 /// whether it is a call expression), which means they can (and
2567 /// should) be resolved in an earlier "phase" of analysis.
2568 /// Overload expressions sometimes pick up further information
2569 /// from their context, like whether the context expects a
2570 /// specific function-pointer type, and so frequently need
2571 /// special treatment.
2572 bool isNonOverloadPlaceholderType() const {
2573 return getKind() > Overload;
2574 }
2575
2576 static bool classof(const Type *T) { return T->getTypeClass() == Builtin; }
2577};
2578
2579/// Complex values, per C99 6.2.5p11. This supports the C99 complex
2580/// types (_Complex float etc) as well as the GCC integer complex extensions.
2581class ComplexType : public Type, public llvm::FoldingSetNode {
2582 friend class ASTContext; // ASTContext creates these.
2583
2584 QualType ElementType;
2585
2586 ComplexType(QualType Element, QualType CanonicalPtr)
2587 : Type(Complex, CanonicalPtr, Element->getDependence()),
2588 ElementType(Element) {}
2589
2590public:
2591 QualType getElementType() const { return ElementType; }
2592
2593 bool isSugared() const { return false; }
2594 QualType desugar() const { return QualType(this, 0); }
2595
2596 void Profile(llvm::FoldingSetNodeID &ID) {
2597 Profile(ID, getElementType());
2598 }
2599
2600 static void Profile(llvm::FoldingSetNodeID &ID, QualType Element) {
2601 ID.AddPointer(Element.getAsOpaquePtr());
2602 }
2603
2604 static bool classof(const Type *T) { return T->getTypeClass() == Complex; }
2605};
2606
2607/// Sugar for parentheses used when specifying types.
2608class ParenType : public Type, public llvm::FoldingSetNode {
2609 friend class ASTContext; // ASTContext creates these.
2610
2611 QualType Inner;
2612
2613 ParenType(QualType InnerType, QualType CanonType)
2614 : Type(Paren, CanonType, InnerType->getDependence()), Inner(InnerType) {}
2615
2616public:
2617 QualType getInnerType() const { return Inner; }
2618
2619 bool isSugared() const { return true; }
2620 QualType desugar() const { return getInnerType(); }
2621
2622 void Profile(llvm::FoldingSetNodeID &ID) {
2623 Profile(ID, getInnerType());
2624 }
2625
2626 static void Profile(llvm::FoldingSetNodeID &ID, QualType Inner) {
2627 Inner.Profile(ID);
2628 }
2629
2630 static bool classof(const Type *T) { return T->getTypeClass() == Paren; }
2631};
2632
2633/// PointerType - C99 6.7.5.1 - Pointer Declarators.
2634class PointerType : public Type, public llvm::FoldingSetNode {
2635 friend class ASTContext; // ASTContext creates these.
2636
2637 QualType PointeeType;
2638
2639 PointerType(QualType Pointee, QualType CanonicalPtr)
2640 : Type(Pointer, CanonicalPtr, Pointee->getDependence()),
2641 PointeeType(Pointee) {}
2642
2643public:
2644 QualType getPointeeType() const { return PointeeType; }
2645
2646 bool isSugared() const { return false; }
2647 QualType desugar() const { return QualType(this, 0); }
2648
2649 void Profile(llvm::FoldingSetNodeID &ID) {
2650 Profile(ID, getPointeeType());
2651 }
2652
2653 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee) {
2654 ID.AddPointer(Pointee.getAsOpaquePtr());
2655 }
2656
2657 static bool classof(const Type *T) { return T->getTypeClass() == Pointer; }
2658};
2659
2660/// Represents a type which was implicitly adjusted by the semantic
2661/// engine for arbitrary reasons. For example, array and function types can
2662/// decay, and function types can have their calling conventions adjusted.
2663class AdjustedType : public Type, public llvm::FoldingSetNode {
2664 QualType OriginalTy;
2665 QualType AdjustedTy;
2666
2667protected:
2668 friend class ASTContext; // ASTContext creates these.
2669
2670 AdjustedType(TypeClass TC, QualType OriginalTy, QualType AdjustedTy,
2671 QualType CanonicalPtr)
2672 : Type(TC, CanonicalPtr, OriginalTy->getDependence()),
2673 OriginalTy(OriginalTy), AdjustedTy(AdjustedTy) {}
2674
2675public:
2676 QualType getOriginalType() const { return OriginalTy; }
2677 QualType getAdjustedType() const { return AdjustedTy; }
2678
2679 bool isSugared() const { return true; }
2680 QualType desugar() const { return AdjustedTy; }
2681
2682 void Profile(llvm::FoldingSetNodeID &ID) {
2683 Profile(ID, OriginalTy, AdjustedTy);
2684 }
2685
2686 static void Profile(llvm::FoldingSetNodeID &ID, QualType Orig, QualType New) {
2687 ID.AddPointer(Orig.getAsOpaquePtr());
2688 ID.AddPointer(New.getAsOpaquePtr());
2689 }
2690
2691 static bool classof(const Type *T) {
2692 return T->getTypeClass() == Adjusted || T->getTypeClass() == Decayed;
2693 }
2694};
2695
2696/// Represents a pointer type decayed from an array or function type.
2697class DecayedType : public AdjustedType {
2698 friend class ASTContext; // ASTContext creates these.
2699
2700 inline
2701 DecayedType(QualType OriginalType, QualType Decayed, QualType Canonical);
2702
2703public:
2704 QualType getDecayedType() const { return getAdjustedType(); }
2705
2706 inline QualType getPointeeType() const;
2707
2708 static bool classof(const Type *T) { return T->getTypeClass() == Decayed; }
2709};
2710
2711/// Pointer to a block type.
2712/// This type is to represent types syntactically represented as
2713/// "void (^)(int)", etc. Pointee is required to always be a function type.
2714class BlockPointerType : public Type, public llvm::FoldingSetNode {
2715 friend class ASTContext; // ASTContext creates these.
2716
2717 // Block is some kind of pointer type
2718 QualType PointeeType;
2719
2720 BlockPointerType(QualType Pointee, QualType CanonicalCls)
2721 : Type(BlockPointer, CanonicalCls, Pointee->getDependence()),
2722 PointeeType(Pointee) {}
2723
2724public:
2725 // Get the pointee type. Pointee is required to always be a function type.
2726 QualType getPointeeType() const { return PointeeType; }
2727
2728 bool isSugared() const { return false; }
2729 QualType desugar() const { return QualType(this, 0); }
2730
2731 void Profile(llvm::FoldingSetNodeID &ID) {
2732 Profile(ID, getPointeeType());
2733 }
2734
2735 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee) {
2736 ID.AddPointer(Pointee.getAsOpaquePtr());
2737 }
2738
2739 static bool classof(const Type *T) {
2740 return T->getTypeClass() == BlockPointer;
2741 }
2742};
2743
2744/// Base for LValueReferenceType and RValueReferenceType
2745class ReferenceType : public Type, public llvm::FoldingSetNode {
2746 QualType PointeeType;
2747
2748protected:
2749 ReferenceType(TypeClass tc, QualType Referencee, QualType CanonicalRef,
2750 bool SpelledAsLValue)
2751 : Type(tc, CanonicalRef, Referencee->getDependence()),
2752 PointeeType(Referencee) {
2753 ReferenceTypeBits.SpelledAsLValue = SpelledAsLValue;
2754 ReferenceTypeBits.InnerRef = Referencee->isReferenceType();
2755 }
2756
2757public:
2758 bool isSpelledAsLValue() const { return ReferenceTypeBits.SpelledAsLValue; }
2759 bool isInnerRef() const { return ReferenceTypeBits.InnerRef; }
2760
2761 QualType getPointeeTypeAsWritten() const { return PointeeType; }
2762
2763 QualType getPointeeType() const {
2764 // FIXME: this might strip inner qualifiers; okay?
2765 const ReferenceType *T = this;
2766 while (T->isInnerRef())
2767 T = T->PointeeType->castAs<ReferenceType>();
2768 return T->PointeeType;
2769 }
2770
2771 void Profile(llvm::FoldingSetNodeID &ID) {
2772 Profile(ID, PointeeType, isSpelledAsLValue());
2773 }
2774
2775 static void Profile(llvm::FoldingSetNodeID &ID,
2776 QualType Referencee,
2777 bool SpelledAsLValue) {
2778 ID.AddPointer(Referencee.getAsOpaquePtr());
2779 ID.AddBoolean(SpelledAsLValue);
2780 }
2781
2782 static bool classof(const Type *T) {
2783 return T->getTypeClass() == LValueReference ||
2784 T->getTypeClass() == RValueReference;
2785 }
2786};
2787
2788/// An lvalue reference type, per C++11 [dcl.ref].
2789class LValueReferenceType : public ReferenceType {
2790 friend class ASTContext; // ASTContext creates these
2791
2792 LValueReferenceType(QualType Referencee, QualType CanonicalRef,
2793 bool SpelledAsLValue)
2794 : ReferenceType(LValueReference, Referencee, CanonicalRef,
2795 SpelledAsLValue) {}
2796
2797public:
2798 bool isSugared() const { return false; }
2799 QualType desugar() const { return QualType(this, 0); }
2800
2801 static bool classof(const Type *T) {
2802 return T->getTypeClass() == LValueReference;
2803 }
2804};
2805
2806/// An rvalue reference type, per C++11 [dcl.ref].
2807class RValueReferenceType : public ReferenceType {
2808 friend class ASTContext; // ASTContext creates these
2809
2810 RValueReferenceType(QualType Referencee, QualType CanonicalRef)
2811 : ReferenceType(RValueReference, Referencee, CanonicalRef, false) {}
2812
2813public:
2814 bool isSugared() const { return false; }
2815 QualType desugar() const { return QualType(this, 0); }
2816
2817 static bool classof(const Type *T) {
2818 return T->getTypeClass() == RValueReference;
2819 }
2820};
2821
2822/// A pointer to member type per C++ 8.3.3 - Pointers to members.
2823///
2824/// This includes both pointers to data members and pointer to member functions.
2825class MemberPointerType : public Type, public llvm::FoldingSetNode {
2826 friend class ASTContext; // ASTContext creates these.
2827
2828 QualType PointeeType;
2829
2830 /// The class of which the pointee is a member. Must ultimately be a
2831 /// RecordType, but could be a typedef or a template parameter too.
2832 const Type *Class;
2833
2834 MemberPointerType(QualType Pointee, const Type *Cls, QualType CanonicalPtr)
2835 : Type(MemberPointer, CanonicalPtr,
2836 (Cls->getDependence() & ~TypeDependence::VariablyModified) |
2837 Pointee->getDependence()),
2838 PointeeType(Pointee), Class(Cls) {}
2839
2840public:
2841 QualType getPointeeType() const { return PointeeType; }
2842
2843 /// Returns true if the member type (i.e. the pointee type) is a
2844 /// function type rather than a data-member type.
2845 bool isMemberFunctionPointer() const {
2846 return PointeeType->isFunctionProtoType();
2847 }
2848
2849 /// Returns true if the member type (i.e. the pointee type) is a
2850 /// data type rather than a function type.
2851 bool isMemberDataPointer() const {
2852 return !PointeeType->isFunctionProtoType();
2853 }
2854
2855 const Type *getClass() const { return Class; }
2856 CXXRecordDecl *getMostRecentCXXRecordDecl() const;
2857
2858 bool isSugared() const { return false; }
2859 QualType desugar() const { return QualType(this, 0); }
2860
2861 void Profile(llvm::FoldingSetNodeID &ID) {
2862 Profile(ID, getPointeeType(), getClass());
2863 }
2864
2865 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee,
2866 const Type *Class) {
2867 ID.AddPointer(Pointee.getAsOpaquePtr());
2868 ID.AddPointer(Class);
2869 }
2870
2871 static bool classof(const Type *T) {
2872 return T->getTypeClass() == MemberPointer;
2873 }
2874};
2875
2876/// Represents an array type, per C99 6.7.5.2 - Array Declarators.
2877class ArrayType : public Type, public llvm::FoldingSetNode {
2878public:
2879 /// Capture whether this is a normal array (e.g. int X[4])
2880 /// an array with a static size (e.g. int X[static 4]), or an array
2881 /// with a star size (e.g. int X[*]).
2882 /// 'static' is only allowed on function parameters.
2883 enum ArraySizeModifier {
2884 Normal, Static, Star
2885 };
2886
2887private:
2888 /// The element type of the array.
2889 QualType ElementType;
2890
2891protected:
2892 friend class ASTContext; // ASTContext creates these.
2893
2894 ArrayType(TypeClass tc, QualType et, QualType can, ArraySizeModifier sm,
2895 unsigned tq, const Expr *sz = nullptr);
2896
2897public:
2898 QualType getElementType() const { return ElementType; }
2899
2900 ArraySizeModifier getSizeModifier() const {
2901 return ArraySizeModifier(ArrayTypeBits.SizeModifier);
2902 }
2903
2904 Qualifiers getIndexTypeQualifiers() const {
2905 return Qualifiers::fromCVRMask(getIndexTypeCVRQualifiers());
2906 }
2907
2908 unsigned getIndexTypeCVRQualifiers() const {
2909 return ArrayTypeBits.IndexTypeQuals;
2910 }
2911
2912 static bool classof(const Type *T) {
2913 return T->getTypeClass() == ConstantArray ||
2914 T->getTypeClass() == VariableArray ||
2915 T->getTypeClass() == IncompleteArray ||
2916 T->getTypeClass() == DependentSizedArray;
2917 }
2918};
2919
2920/// Represents the canonical version of C arrays with a specified constant size.
2921/// For example, the canonical type for 'int A[4 + 4*100]' is a
2922/// ConstantArrayType where the element type is 'int' and the size is 404.
2923class ConstantArrayType final
2924 : public ArrayType,
2925 private llvm::TrailingObjects<ConstantArrayType, const Expr *> {
2926 friend class ASTContext; // ASTContext creates these.
2927 friend TrailingObjects;
2928
2929 llvm::APInt Size; // Allows us to unique the type.
2930
2931 ConstantArrayType(QualType et, QualType can, const llvm::APInt &size,
2932 const Expr *sz, ArraySizeModifier sm, unsigned tq)
2933 : ArrayType(ConstantArray, et, can, sm, tq, sz), Size(size) {
2934 ConstantArrayTypeBits.HasStoredSizeExpr = sz != nullptr;
2935 if (ConstantArrayTypeBits.HasStoredSizeExpr) {
2936 assert(!can.isNull() && "canonical constant array should not have size")((void)0);
2937 *getTrailingObjects<const Expr*>() = sz;
2938 }
2939 }
2940
2941 unsigned numTrailingObjects(OverloadToken<const Expr*>) const {
2942 return ConstantArrayTypeBits.HasStoredSizeExpr;
2943 }
2944
2945public:
2946 const llvm::APInt &getSize() const { return Size; }
2947 const Expr *getSizeExpr() const {
2948 return ConstantArrayTypeBits.HasStoredSizeExpr
2949 ? *getTrailingObjects<const Expr *>()
2950 : nullptr;
2951 }
2952 bool isSugared() const { return false; }
2953 QualType desugar() const { return QualType(this, 0); }
2954
2955 /// Determine the number of bits required to address a member of
2956 // an array with the given element type and number of elements.
2957 static unsigned getNumAddressingBits(const ASTContext &Context,
2958 QualType ElementType,
2959 const llvm::APInt &NumElements);
2960
2961 /// Determine the maximum number of active bits that an array's size
2962 /// can require, which limits the maximum size of the array.
2963 static unsigned getMaxSizeBits(const ASTContext &Context);
2964
2965 void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Ctx) {
2966 Profile(ID, Ctx, getElementType(), getSize(), getSizeExpr(),
2967 getSizeModifier(), getIndexTypeCVRQualifiers());
2968 }
2969
2970 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Ctx,
2971 QualType ET, const llvm::APInt &ArraySize,
2972 const Expr *SizeExpr, ArraySizeModifier SizeMod,
2973 unsigned TypeQuals);
2974
2975 static bool classof(const Type *T) {
2976 return T->getTypeClass() == ConstantArray;
2977 }
2978};
2979
2980/// Represents a C array with an unspecified size. For example 'int A[]' has
2981/// an IncompleteArrayType where the element type is 'int' and the size is
2982/// unspecified.
2983class IncompleteArrayType : public ArrayType {
2984 friend class ASTContext; // ASTContext creates these.
2985
2986 IncompleteArrayType(QualType et, QualType can,
2987 ArraySizeModifier sm, unsigned tq)
2988 : ArrayType(IncompleteArray, et, can, sm, tq) {}
2989
2990public:
2991 friend class StmtIteratorBase;
2992
2993 bool isSugared() const { return false; }
2994 QualType desugar() const { return QualType(this, 0); }
2995
2996 static bool classof(const Type *T) {
2997 return T->getTypeClass() == IncompleteArray;
2998 }
2999
3000 void Profile(llvm::FoldingSetNodeID &ID) {
3001 Profile(ID, getElementType(), getSizeModifier(),
3002 getIndexTypeCVRQualifiers());
3003 }
3004
3005 static void Profile(llvm::FoldingSetNodeID &ID, QualType ET,
3006 ArraySizeModifier SizeMod, unsigned TypeQuals) {
3007 ID.AddPointer(ET.getAsOpaquePtr());
3008 ID.AddInteger(SizeMod);
3009 ID.AddInteger(TypeQuals);
3010 }
3011};
3012
3013/// Represents a C array with a specified size that is not an
3014/// integer-constant-expression. For example, 'int s[x+foo()]'.
3015/// Since the size expression is an arbitrary expression, we store it as such.
3016///
3017/// Note: VariableArrayType's aren't uniqued (since the expressions aren't) and
3018/// should not be: two lexically equivalent variable array types could mean
3019/// different things, for example, these variables do not have the same type
3020/// dynamically:
3021///
3022/// void foo(int x) {
3023/// int Y[x];
3024/// ++x;
3025/// int Z[x];
3026/// }
3027class VariableArrayType : public ArrayType {
3028 friend class ASTContext; // ASTContext creates these.
3029
3030 /// An assignment-expression. VLA's are only permitted within
3031 /// a function block.
3032 Stmt *SizeExpr;
3033
3034 /// The range spanned by the left and right array brackets.
3035 SourceRange Brackets;
3036
3037 VariableArrayType(QualType et, QualType can, Expr *e,
3038 ArraySizeModifier sm, unsigned tq,
3039 SourceRange brackets)
3040 : ArrayType(VariableArray, et, can, sm, tq, e),
3041 SizeExpr((Stmt*) e), Brackets(brackets) {}
3042
3043public:
3044 friend class StmtIteratorBase;
3045
3046 Expr *getSizeExpr() const {
3047 // We use C-style casts instead of cast<> here because we do not wish
3048 // to have a dependency of Type.h on Stmt.h/Expr.h.
3049 return (Expr*) SizeExpr;
3050 }
3051
3052 SourceRange getBracketsRange() const { return Brackets; }
3053 SourceLocation getLBracketLoc() const { return Brackets.getBegin(); }
3054 SourceLocation getRBracketLoc() const { return Brackets.getEnd(); }
3055
3056 bool isSugared() const { return false; }
3057 QualType desugar() const { return QualType(this, 0); }
3058
3059 static bool classof(const Type *T) {
3060 return T->getTypeClass() == VariableArray;
3061 }
3062
3063 void Profile(llvm::FoldingSetNodeID &ID) {
3064 llvm_unreachable("Cannot unique VariableArrayTypes.")__builtin_unreachable();
3065 }
3066};
3067
3068/// Represents an array type in C++ whose size is a value-dependent expression.
3069///
3070/// For example:
3071/// \code
3072/// template<typename T, int Size>
3073/// class array {
3074/// T data[Size];
3075/// };
3076/// \endcode
3077///
3078/// For these types, we won't actually know what the array bound is
3079/// until template instantiation occurs, at which point this will
3080/// become either a ConstantArrayType or a VariableArrayType.
3081class DependentSizedArrayType : public ArrayType {
3082 friend class ASTContext; // ASTContext creates these.
3083
3084 const ASTContext &Context;
3085
3086 /// An assignment expression that will instantiate to the
3087 /// size of the array.
3088 ///
3089 /// The expression itself might be null, in which case the array
3090 /// type will have its size deduced from an initializer.
3091 Stmt *SizeExpr;
3092
3093 /// The range spanned by the left and right array brackets.
3094 SourceRange Brackets;
3095
3096 DependentSizedArrayType(const ASTContext &Context, QualType et, QualType can,
3097 Expr *e, ArraySizeModifier sm, unsigned tq,
3098 SourceRange brackets);
3099
3100public:
3101 friend class StmtIteratorBase;
3102
3103 Expr *getSizeExpr() const {
3104 // We use C-style casts instead of cast<> here because we do not wish
3105 // to have a dependency of Type.h on Stmt.h/Expr.h.
3106 return (Expr*) SizeExpr;
3107 }
3108
3109 SourceRange getBracketsRange() const { return Brackets; }
3110 SourceLocation getLBracketLoc() const { return Brackets.getBegin(); }
3111 SourceLocation getRBracketLoc() const { return Brackets.getEnd(); }
3112
3113 bool isSugared() const { return false; }
3114 QualType desugar() const { return QualType(this, 0); }
3115
3116 static bool classof(const Type *T) {
3117 return T->getTypeClass() == DependentSizedArray;
3118 }
3119
3120 void Profile(llvm::FoldingSetNodeID &ID) {
3121 Profile(ID, Context, getElementType(),
3122 getSizeModifier(), getIndexTypeCVRQualifiers(), getSizeExpr());
3123 }
3124
3125 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
3126 QualType ET, ArraySizeModifier SizeMod,
3127 unsigned TypeQuals, Expr *E);
3128};
3129
3130/// Represents an extended address space qualifier where the input address space
3131/// value is dependent. Non-dependent address spaces are not represented with a
3132/// special Type subclass; they are stored on an ExtQuals node as part of a QualType.
3133///
3134/// For example:
3135/// \code
3136/// template<typename T, int AddrSpace>
3137/// class AddressSpace {
3138/// typedef T __attribute__((address_space(AddrSpace))) type;
3139/// }
3140/// \endcode
3141class DependentAddressSpaceType : public Type, public llvm::FoldingSetNode {
3142 friend class ASTContext;
3143
3144 const ASTContext &Context;
3145 Expr *AddrSpaceExpr;
3146 QualType PointeeType;
3147 SourceLocation loc;
3148
3149 DependentAddressSpaceType(const ASTContext &Context, QualType PointeeType,
3150 QualType can, Expr *AddrSpaceExpr,
3151 SourceLocation loc);
3152
3153public:
3154 Expr *getAddrSpaceExpr() const { return AddrSpaceExpr; }
3155 QualType getPointeeType() const { return PointeeType; }
3156 SourceLocation getAttributeLoc() const { return loc; }
3157
3158 bool isSugared() const { return false; }
3159 QualType desugar() const { return QualType(this, 0); }
3160
3161 static bool classof(const Type *T) {
3162 return T->getTypeClass() == DependentAddressSpace;
3163 }
3164
3165 void Profile(llvm::FoldingSetNodeID &ID) {
3166 Profile(ID, Context, getPointeeType(), getAddrSpaceExpr());
3167 }
3168
3169 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
3170 QualType PointeeType, Expr *AddrSpaceExpr);
3171};
3172
3173/// Represents an extended vector type where either the type or size is
3174/// dependent.
3175///
3176/// For example:
3177/// \code
3178/// template<typename T, int Size>
3179/// class vector {
3180/// typedef T __attribute__((ext_vector_type(Size))) type;
3181/// }
3182/// \endcode
3183class DependentSizedExtVectorType : public Type, public llvm::FoldingSetNode {
3184 friend class ASTContext;
3185
3186 const ASTContext &Context;
3187 Expr *SizeExpr;
3188
3189 /// The element type of the array.
3190 QualType ElementType;
3191
3192 SourceLocation loc;
3193
3194 DependentSizedExtVectorType(const ASTContext &Context, QualType ElementType,
3195 QualType can, Expr *SizeExpr, SourceLocation loc);
3196
3197public:
3198 Expr *getSizeExpr() const { return SizeExpr; }
3199 QualType getElementType() const { return ElementType; }
3200 SourceLocation getAttributeLoc() const { return loc; }
3201
3202 bool isSugared() const { return false; }
3203 QualType desugar() const { return QualType(this, 0); }
3204
3205 static bool classof(const Type *T) {
3206 return T->getTypeClass() == DependentSizedExtVector;
3207 }
3208
3209 void Profile(llvm::FoldingSetNodeID &ID) {
3210 Profile(ID, Context, getElementType(), getSizeExpr());
3211 }
3212
3213 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
3214 QualType ElementType, Expr *SizeExpr);
3215};
3216
3217
3218/// Represents a GCC generic vector type. This type is created using
3219/// __attribute__((vector_size(n)), where "n" specifies the vector size in
3220/// bytes; or from an Altivec __vector or vector declaration.
3221/// Since the constructor takes the number of vector elements, the
3222/// client is responsible for converting the size into the number of elements.
3223class VectorType : public Type, public llvm::FoldingSetNode {
3224public:
3225 enum VectorKind {
3226 /// not a target-specific vector type
3227 GenericVector,
3228
3229 /// is AltiVec vector
3230 AltiVecVector,
3231
3232 /// is AltiVec 'vector Pixel'
3233 AltiVecPixel,
3234
3235 /// is AltiVec 'vector bool ...'
3236 AltiVecBool,
3237
3238 /// is ARM Neon vector
3239 NeonVector,
3240
3241 /// is ARM Neon polynomial vector
3242 NeonPolyVector,
3243
3244 /// is AArch64 SVE fixed-length data vector
3245 SveFixedLengthDataVector,
3246
3247 /// is AArch64 SVE fixed-length predicate vector
3248 SveFixedLengthPredicateVector
3249 };
3250
3251protected:
3252 friend class ASTContext; // ASTContext creates these.
3253
3254 /// The element type of the vector.
3255 QualType ElementType;
3256
3257 VectorType(QualType vecType, unsigned nElements, QualType canonType,
3258 VectorKind vecKind);
3259
3260 VectorType(TypeClass tc, QualType vecType, unsigned nElements,
3261 QualType canonType, VectorKind vecKind);
3262
3263public:
3264 QualType getElementType() const { return ElementType; }
3265 unsigned getNumElements() const { return VectorTypeBits.NumElements; }
3266
3267 bool isSugared() const { return false; }
3268 QualType desugar() const { return QualType(this, 0); }
3269
3270 VectorKind getVectorKind() const {
3271 return VectorKind(VectorTypeBits.VecKind);
3272 }
3273
3274 void Profile(llvm::FoldingSetNodeID &ID) {
3275 Profile(ID, getElementType(), getNumElements(),
3276 getTypeClass(), getVectorKind());
3277 }
3278
3279 static void Profile(llvm::FoldingSetNodeID &ID, QualType ElementType,
3280 unsigned NumElements, TypeClass TypeClass,
3281 VectorKind VecKind) {
3282 ID.AddPointer(ElementType.getAsOpaquePtr());
3283 ID.AddInteger(NumElements);
3284 ID.AddInteger(TypeClass);
3285 ID.AddInteger(VecKind);
3286 }
3287
3288 static bool classof(const Type *T) {
3289 return T->getTypeClass() == Vector || T->getTypeClass() == ExtVector;
3290 }
3291};
3292
3293/// Represents a vector type where either the type or size is dependent.
3294////
3295/// For example:
3296/// \code
3297/// template<typename T, int Size>
3298/// class vector {
3299/// typedef T __attribute__((vector_size(Size))) type;
3300/// }
3301/// \endcode
3302class DependentVectorType : public Type, public llvm::FoldingSetNode {
3303 friend class ASTContext;
3304
3305 const ASTContext &Context;
3306 QualType ElementType;
3307 Expr *SizeExpr;
3308 SourceLocation Loc;
3309
3310 DependentVectorType(const ASTContext &Context, QualType ElementType,
3311 QualType CanonType, Expr *SizeExpr,
3312 SourceLocation Loc, VectorType::VectorKind vecKind);
3313
3314public:
3315 Expr *getSizeExpr() const { return SizeExpr; }
3316 QualType getElementType() const { return ElementType; }
3317 SourceLocation getAttributeLoc() const { return Loc; }
3318 VectorType::VectorKind getVectorKind() const {
3319 return VectorType::VectorKind(VectorTypeBits.VecKind);
3320 }
3321
3322 bool isSugared() const { return false; }
3323 QualType desugar() const { return QualType(this, 0); }
3324
3325 static bool classof(const Type *T) {
3326 return T->getTypeClass() == DependentVector;
3327 }
3328
3329 void Profile(llvm::FoldingSetNodeID &ID) {
3330 Profile(ID, Context, getElementType(), getSizeExpr(), getVectorKind());
3331 }
3332
3333 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
3334 QualType ElementType, const Expr *SizeExpr,
3335 VectorType::VectorKind VecKind);
3336};
3337
3338/// ExtVectorType - Extended vector type. This type is created using
3339/// __attribute__((ext_vector_type(n)), where "n" is the number of elements.
3340/// Unlike vector_size, ext_vector_type is only allowed on typedef's. This
3341/// class enables syntactic extensions, like Vector Components for accessing
3342/// points (as .xyzw), colors (as .rgba), and textures (modeled after OpenGL
3343/// Shading Language).
3344class ExtVectorType : public VectorType {
3345 friend class ASTContext; // ASTContext creates these.
3346
3347 ExtVectorType(QualType vecType, unsigned nElements, QualType canonType)
3348 : VectorType(ExtVector, vecType, nElements, canonType, GenericVector) {}
3349
3350public:
3351 static int getPointAccessorIdx(char c) {
3352 switch (c) {
3353 default: return -1;
3354 case 'x': case 'r': return 0;
3355 case 'y': case 'g': return 1;
3356 case 'z': case 'b': return 2;
3357 case 'w': case 'a': return 3;
3358 }
3359 }
3360
3361 static int getNumericAccessorIdx(char c) {
3362 switch (c) {
3363 default: return -1;
3364 case '0': return 0;
3365 case '1': return 1;
3366 case '2': return 2;
3367 case '3': return 3;
3368 case '4': return 4;
3369 case '5': return 5;
3370 case '6': return 6;
3371 case '7': return 7;
3372 case '8': return 8;
3373 case '9': return 9;
3374 case 'A':
3375 case 'a': return 10;
3376 case 'B':
3377 case 'b': return 11;
3378 case 'C':
3379 case 'c': return 12;
3380 case 'D':
3381 case 'd': return 13;
3382 case 'E':
3383 case 'e': return 14;
3384 case 'F':
3385 case 'f': return 15;
3386 }
3387 }
3388
3389 static int getAccessorIdx(char c, bool isNumericAccessor) {
3390 if (isNumericAccessor)
3391 return getNumericAccessorIdx(c);
3392 else
3393 return getPointAccessorIdx(c);
3394 }
3395
3396 bool isAccessorWithinNumElements(char c, bool isNumericAccessor) const {
3397 if (int idx = getAccessorIdx(c, isNumericAccessor)+1)
3398 return unsigned(idx-1) < getNumElements();
3399 return false;
3400 }
3401
3402 bool isSugared() const { return false; }
3403 QualType desugar() const { return QualType(this, 0); }
3404
3405 static bool classof(const Type *T) {
3406 return T->getTypeClass() == ExtVector;
3407 }
3408};
3409
3410/// Represents a matrix type, as defined in the Matrix Types clang extensions.
3411/// __attribute__((matrix_type(rows, columns))), where "rows" specifies
3412/// number of rows and "columns" specifies the number of columns.
3413class MatrixType : public Type, public llvm::FoldingSetNode {
3414protected:
3415 friend class ASTContext;
3416
3417 /// The element type of the matrix.
3418 QualType ElementType;
3419
3420 MatrixType(QualType ElementTy, QualType CanonElementTy);
3421
3422 MatrixType(TypeClass TypeClass, QualType ElementTy, QualType CanonElementTy,
3423 const Expr *RowExpr = nullptr, const Expr *ColumnExpr = nullptr);
3424
3425public:
3426 /// Returns type of the elements being stored in the matrix
3427 QualType getElementType() const { return ElementType; }
3428
3429 /// Valid elements types are the following:
3430 /// * an integer type (as in C2x 6.2.5p19), but excluding enumerated types
3431 /// and _Bool
3432 /// * the standard floating types float or double
3433 /// * a half-precision floating point type, if one is supported on the target
3434 static bool isValidElementType(QualType T) {
3435 return T->isDependentType() ||
3436 (T->isRealType() && !T->isBooleanType() && !T->isEnumeralType());
3437 }
3438
3439 bool isSugared() const { return false; }
3440 QualType desugar() const { return QualType(this, 0); }
3441
3442 static bool classof(const Type *T) {
3443 return T->getTypeClass() == ConstantMatrix ||
3444 T->getTypeClass() == DependentSizedMatrix;
3445 }
3446};
3447
3448/// Represents a concrete matrix type with constant number of rows and columns
3449class ConstantMatrixType final : public MatrixType {
3450protected:
3451 friend class ASTContext;
3452
3453 /// The element type of the matrix.
3454 // FIXME: Appears to be unused? There is also MatrixType::ElementType...
3455 QualType ElementType;
3456
3457 /// Number of rows and columns.
3458 unsigned NumRows;
3459 unsigned NumColumns;
3460
3461 static constexpr unsigned MaxElementsPerDimension = (1 << 20) - 1;
3462
3463 ConstantMatrixType(QualType MatrixElementType, unsigned NRows,
3464 unsigned NColumns, QualType CanonElementType);
3465
3466 ConstantMatrixType(TypeClass typeClass, QualType MatrixType, unsigned NRows,
3467 unsigned NColumns, QualType CanonElementType);
3468
3469public:
3470 /// Returns the number of rows in the matrix.
3471 unsigned getNumRows() const { return NumRows; }
3472
3473 /// Returns the number of columns in the matrix.
3474 unsigned getNumColumns() const { return NumColumns; }
3475
3476 /// Returns the number of elements required to embed the matrix into a vector.
3477 unsigned getNumElementsFlattened() const {
3478 return getNumRows() * getNumColumns();
3479 }
3480
3481 /// Returns true if \p NumElements is a valid matrix dimension.
3482 static constexpr bool isDimensionValid(size_t NumElements) {
3483 return NumElements > 0 && NumElements <= MaxElementsPerDimension;
3484 }
3485
3486 /// Returns the maximum number of elements per dimension.
3487 static constexpr unsigned getMaxElementsPerDimension() {
3488 return MaxElementsPerDimension;
3489 }
3490
3491 void Profile(llvm::FoldingSetNodeID &ID) {
3492 Profile(ID, getElementType(), getNumRows(), getNumColumns(),
3493 getTypeClass());
3494 }
3495
3496 static void Profile(llvm::FoldingSetNodeID &ID, QualType ElementType,
3497 unsigned NumRows, unsigned NumColumns,
3498 TypeClass TypeClass) {
3499 ID.AddPointer(ElementType.getAsOpaquePtr());
3500 ID.AddInteger(NumRows);
3501 ID.AddInteger(NumColumns);
3502 ID.AddInteger(TypeClass);
3503 }
3504
3505 static bool classof(const Type *T) {
3506 return T->getTypeClass() == ConstantMatrix;
3507 }
3508};
3509
3510/// Represents a matrix type where the type and the number of rows and columns
3511/// is dependent on a template.
3512class DependentSizedMatrixType final : public MatrixType {
3513 friend class ASTContext;
3514
3515 const ASTContext &Context;
3516 Expr *RowExpr;
3517 Expr *ColumnExpr;
3518
3519 SourceLocation loc;
3520
3521 DependentSizedMatrixType(const ASTContext &Context, QualType ElementType,
3522 QualType CanonicalType, Expr *RowExpr,
3523 Expr *ColumnExpr, SourceLocation loc);
3524
3525public:
3526 QualType getElementType() const { return ElementType; }
3527 Expr *getRowExpr() const { return RowExpr; }
3528 Expr *getColumnExpr() const { return ColumnExpr; }
3529 SourceLocation getAttributeLoc() const { return loc; }
3530
3531 bool isSugared() const { return false; }
3532 QualType desugar() const { return QualType(this, 0); }
3533
3534 static bool classof(const Type *T) {
3535 return T->getTypeClass() == DependentSizedMatrix;
3536 }
3537
3538 void Profile(llvm::FoldingSetNodeID &ID) {
3539 Profile(ID, Context, getElementType(), getRowExpr(), getColumnExpr());
3540 }
3541
3542 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
3543 QualType ElementType, Expr *RowExpr, Expr *ColumnExpr);
3544};
3545
3546/// FunctionType - C99 6.7.5.3 - Function Declarators. This is the common base
3547/// class of FunctionNoProtoType and FunctionProtoType.
3548class FunctionType : public Type {
3549 // The type returned by the function.
3550 QualType ResultType;
3551
3552public:
3553 /// Interesting information about a specific parameter that can't simply
3554 /// be reflected in parameter's type. This is only used by FunctionProtoType
3555 /// but is in FunctionType to make this class available during the
3556 /// specification of the bases of FunctionProtoType.
3557 ///
3558 /// It makes sense to model language features this way when there's some
3559 /// sort of parameter-specific override (such as an attribute) that
3560 /// affects how the function is called. For example, the ARC ns_consumed
3561 /// attribute changes whether a parameter is passed at +0 (the default)
3562 /// or +1 (ns_consumed). This must be reflected in the function type,
3563 /// but isn't really a change to the parameter type.
3564 ///
3565 /// One serious disadvantage of modelling language features this way is
3566 /// that they generally do not work with language features that attempt
3567 /// to destructure types. For example, template argument deduction will
3568 /// not be able to match a parameter declared as
3569 /// T (*)(U)
3570 /// against an argument of type
3571 /// void (*)(__attribute__((ns_consumed)) id)
3572 /// because the substitution of T=void, U=id into the former will
3573 /// not produce the latter.
3574 class ExtParameterInfo {
3575 enum {
3576 ABIMask = 0x0F,
3577 IsConsumed = 0x10,
3578 HasPassObjSize = 0x20,
3579 IsNoEscape = 0x40,
3580 };
3581 unsigned char Data = 0;
3582
3583 public:
3584 ExtParameterInfo() = default;
3585
3586 /// Return the ABI treatment of this parameter.
3587 ParameterABI getABI() const { return ParameterABI(Data & ABIMask); }
3588 ExtParameterInfo withABI(ParameterABI kind) const {
3589 ExtParameterInfo copy = *this;
3590 copy.Data = (copy.Data & ~ABIMask) | unsigned(kind);
3591 return copy;
3592 }
3593
3594 /// Is this parameter considered "consumed" by Objective-C ARC?
3595 /// Consumed parameters must have retainable object type.
3596 bool isConsumed() const { return (Data & IsConsumed); }
3597 ExtParameterInfo withIsConsumed(bool consumed) const {
3598 ExtParameterInfo copy = *this;
3599 if (consumed)
3600 copy.Data |= IsConsumed;
3601 else
3602 copy.Data &= ~IsConsumed;
3603 return copy;
3604 }
3605
3606 bool hasPassObjectSize() const { return Data & HasPassObjSize; }
3607 ExtParameterInfo withHasPassObjectSize() const {
3608 ExtParameterInfo Copy = *this;
3609 Copy.Data |= HasPassObjSize;
3610 return Copy;
3611 }
3612
3613 bool isNoEscape() const { return Data & IsNoEscape; }
3614 ExtParameterInfo withIsNoEscape(bool NoEscape) const {
3615 ExtParameterInfo Copy = *this;
3616 if (NoEscape)
3617 Copy.Data |= IsNoEscape;
3618 else
3619 Copy.Data &= ~IsNoEscape;
3620 return Copy;
3621 }
3622
3623 unsigned char getOpaqueValue() const { return Data; }
3624 static ExtParameterInfo getFromOpaqueValue(unsigned char data) {
3625 ExtParameterInfo result;
3626 result.Data = data;
3627 return result;
3628 }
3629
3630 friend bool operator==(ExtParameterInfo lhs, ExtParameterInfo rhs) {
3631 return lhs.Data == rhs.Data;
3632 }
3633
3634 friend bool operator!=(ExtParameterInfo lhs, ExtParameterInfo rhs) {
3635 return lhs.Data != rhs.Data;
3636 }
3637 };
3638
3639 /// A class which abstracts out some details necessary for
3640 /// making a call.
3641 ///
3642 /// It is not actually used directly for storing this information in
3643 /// a FunctionType, although FunctionType does currently use the
3644 /// same bit-pattern.
3645 ///
3646 // If you add a field (say Foo), other than the obvious places (both,
3647 // constructors, compile failures), what you need to update is
3648 // * Operator==
3649 // * getFoo
3650 // * withFoo
3651 // * functionType. Add Foo, getFoo.
3652 // * ASTContext::getFooType
3653 // * ASTContext::mergeFunctionTypes
3654 // * FunctionNoProtoType::Profile
3655 // * FunctionProtoType::Profile
3656 // * TypePrinter::PrintFunctionProto
3657 // * AST read and write
3658 // * Codegen
3659 class ExtInfo {
3660 friend class FunctionType;
3661
3662 // Feel free to rearrange or add bits, but if you go over 16, you'll need to
3663 // adjust the Bits field below, and if you add bits, you'll need to adjust
3664 // Type::FunctionTypeBitfields::ExtInfo as well.
3665
3666 // | CC |noreturn|produces|nocallersavedregs|regparm|nocfcheck|cmsenscall|
3667 // |0 .. 4| 5 | 6 | 7 |8 .. 10| 11 | 12 |
3668 //
3669 // regparm is either 0 (no regparm attribute) or the regparm value+1.
3670 enum { CallConvMask = 0x1F };
3671 enum { NoReturnMask = 0x20 };
3672 enum { ProducesResultMask = 0x40 };
3673 enum { NoCallerSavedRegsMask = 0x80 };
3674 enum {
3675 RegParmMask = 0x700,
3676 RegParmOffset = 8
3677 };
3678 enum { NoCfCheckMask = 0x800 };
3679 enum { CmseNSCallMask = 0x1000 };
3680 uint16_t Bits = CC_C;
3681
3682 ExtInfo(unsigned Bits) : Bits(static_cast<uint16_t>(Bits)) {}
3683
3684 public:
3685 // Constructor with no defaults. Use this when you know that you
3686 // have all the elements (when reading an AST file for example).
3687 ExtInfo(bool noReturn, bool hasRegParm, unsigned regParm, CallingConv cc,
3688 bool producesResult, bool noCallerSavedRegs, bool NoCfCheck,
3689 bool cmseNSCall) {
3690 assert((!hasRegParm || regParm < 7) && "Invalid regparm value")((void)0);
3691 Bits = ((unsigned)cc) | (noReturn ? NoReturnMask : 0) |
3692 (producesResult ? ProducesResultMask : 0) |
3693 (noCallerSavedRegs ? NoCallerSavedRegsMask : 0) |
3694 (hasRegParm ? ((regParm + 1) << RegParmOffset) : 0) |
3695 (NoCfCheck ? NoCfCheckMask : 0) |
3696 (cmseNSCall ? CmseNSCallMask : 0);
3697 }
3698
3699 // Constructor with all defaults. Use when for example creating a
3700 // function known to use defaults.
3701 ExtInfo() = default;
3702
3703 // Constructor with just the calling convention, which is an important part
3704 // of the canonical type.
3705 ExtInfo(CallingConv CC) : Bits(CC) {}
3706
3707 bool getNoReturn() const { return Bits & NoReturnMask; }
3708 bool getProducesResult() const { return Bits & ProducesResultMask; }
3709 bool getCmseNSCall() const { return Bits & CmseNSCallMask; }
3710 bool getNoCallerSavedRegs() const { return Bits & NoCallerSavedRegsMask; }
3711 bool getNoCfCheck() const { return Bits & NoCfCheckMask; }
3712 bool getHasRegParm() const { return ((Bits & RegParmMask) >> RegParmOffset) != 0; }
3713
3714 unsigned getRegParm() const {
3715 unsigned RegParm = (Bits & RegParmMask) >> RegParmOffset;
3716 if (RegParm > 0)
3717 --RegParm;
3718 return RegParm;
3719 }
3720
3721 CallingConv getCC() const { return CallingConv(Bits & CallConvMask); }
3722
3723 bool operator==(ExtInfo Other) const {
3724 return Bits == Other.Bits;
3725 }
3726 bool operator!=(ExtInfo Other) const {
3727 return Bits != Other.Bits;
3728 }
3729
3730 // Note that we don't have setters. That is by design, use
3731 // the following with methods instead of mutating these objects.
3732
3733 ExtInfo withNoReturn(bool noReturn) const {
3734 if (noReturn)
3735 return ExtInfo(Bits | NoReturnMask);
3736 else
3737 return ExtInfo(Bits & ~NoReturnMask);
3738 }
3739
3740 ExtInfo withProducesResult(bool producesResult) const {
3741 if (producesResult)
3742 return ExtInfo(Bits | ProducesResultMask);
3743 else
3744 return ExtInfo(Bits & ~ProducesResultMask);
3745 }
3746
3747 ExtInfo withCmseNSCall(bool cmseNSCall) const {
3748 if (cmseNSCall)
3749 return ExtInfo(Bits | CmseNSCallMask);
3750 else
3751 return ExtInfo(Bits & ~CmseNSCallMask);
3752 }
3753
3754 ExtInfo withNoCallerSavedRegs(bool noCallerSavedRegs) const {
3755 if (noCallerSavedRegs)
3756 return ExtInfo(Bits | NoCallerSavedRegsMask);
3757 else
3758 return ExtInfo(Bits & ~NoCallerSavedRegsMask);
3759 }
3760
3761 ExtInfo withNoCfCheck(bool noCfCheck) const {
3762 if (noCfCheck)
3763 return ExtInfo(Bits | NoCfCheckMask);
3764 else
3765 return ExtInfo(Bits & ~NoCfCheckMask);
3766 }
3767
3768 ExtInfo withRegParm(unsigned RegParm) const {
3769 assert(RegParm < 7 && "Invalid regparm value")((void)0);
3770 return ExtInfo((Bits & ~RegParmMask) |
3771 ((RegParm + 1) << RegParmOffset));
3772 }
3773
3774 ExtInfo withCallingConv(CallingConv cc) const {
3775 return ExtInfo((Bits & ~CallConvMask) | (unsigned) cc);
3776 }
3777
3778 void Profile(llvm::FoldingSetNodeID &ID) const {
3779 ID.AddInteger(Bits);
3780 }
3781 };
3782
3783 /// A simple holder for a QualType representing a type in an
3784 /// exception specification. Unfortunately needed by FunctionProtoType
3785 /// because TrailingObjects cannot handle repeated types.
3786 struct ExceptionType { QualType Type; };
3787
3788 /// A simple holder for various uncommon bits which do not fit in
3789 /// FunctionTypeBitfields. Aligned to alignof(void *) to maintain the
3790 /// alignment of subsequent objects in TrailingObjects. You must update
3791 /// hasExtraBitfields in FunctionProtoType after adding extra data here.
3792 struct alignas(void *) FunctionTypeExtraBitfields {
3793 /// The number of types in the exception specification.
3794 /// A whole unsigned is not needed here and according to
3795 /// [implimits] 8 bits would be enough here.
3796 unsigned NumExceptionType;
3797 };
3798
3799protected:
3800 FunctionType(TypeClass tc, QualType res, QualType Canonical,
3801 TypeDependence Dependence, ExtInfo Info)
3802 : Type(tc, Canonical, Dependence), ResultType(res) {
3803 FunctionTypeBits.ExtInfo = Info.Bits;
3804 }
3805
3806 Qualifiers getFastTypeQuals() const {
3807 return Qualifiers::fromFastMask(FunctionTypeBits.FastTypeQuals);
3808 }
3809
3810public:
3811 QualType getReturnType() const { return ResultType; }
3812
3813 bool getHasRegParm() const { return getExtInfo().getHasRegParm(); }
3814 unsigned getRegParmType() const { return getExtInfo().getRegParm(); }
3815
3816 /// Determine whether this function type includes the GNU noreturn
3817 /// attribute. The C++11 [[noreturn]] attribute does not affect the function
3818 /// type.
3819 bool getNoReturnAttr() const { return getExtInfo().getNoReturn(); }
3820
3821 bool getCmseNSCallAttr() const { return getExtInfo().getCmseNSCall(); }
3822 CallingConv getCallConv() const { return getExtInfo().getCC(); }
3823 ExtInfo getExtInfo() const { return ExtInfo(FunctionTypeBits.ExtInfo); }
3824
3825 static_assert((~Qualifiers::FastMask & Qualifiers::CVRMask) == 0,
3826 "Const, volatile and restrict are assumed to be a subset of "
3827 "the fast qualifiers.");
3828
3829 bool isConst() const { return getFastTypeQuals().hasConst(); }
3830 bool isVolatile() const { return getFastTypeQuals().hasVolatile(); }
3831 bool isRestrict() const { return getFastTypeQuals().hasRestrict(); }
3832
3833 /// Determine the type of an expression that calls a function of
3834 /// this type.
3835 QualType getCallResultType(const ASTContext &Context) const {
3836 return getReturnType().getNonLValueExprType(Context);
3837 }
3838
3839 static StringRef getNameForCallConv(CallingConv CC);
3840
3841 static bool classof(const Type *T) {
3842 return T->getTypeClass() == FunctionNoProto ||
3843 T->getTypeClass() == FunctionProto;
3844 }
3845};
3846
3847/// Represents a K&R-style 'int foo()' function, which has
3848/// no information available about its arguments.
3849class FunctionNoProtoType : public FunctionType, public llvm::FoldingSetNode {
3850 friend class ASTContext; // ASTContext creates these.
3851
3852 FunctionNoProtoType(QualType Result, QualType Canonical, ExtInfo Info)
3853 : FunctionType(FunctionNoProto, Result, Canonical,
3854 Result->getDependence() &
3855 ~(TypeDependence::DependentInstantiation |
3856 TypeDependence::UnexpandedPack),
3857 Info) {}
3858
3859public:
3860 // No additional state past what FunctionType provides.
3861
3862 bool isSugared() const { return false; }
3863 QualType desugar() const { return QualType(this, 0); }
3864
3865 void Profile(llvm::FoldingSetNodeID &ID) {
3866 Profile(ID, getReturnType(), getExtInfo());
3867 }
3868
3869 static void Profile(llvm::FoldingSetNodeID &ID, QualType ResultType,
3870 ExtInfo Info) {
3871 Info.Profile(ID);
3872 ID.AddPointer(ResultType.getAsOpaquePtr());
3873 }
3874
3875 static bool classof(const Type *T) {
3876 return T->getTypeClass() == FunctionNoProto;
3877 }
3878};
3879
3880/// Represents a prototype with parameter type info, e.g.
3881/// 'int foo(int)' or 'int foo(void)'. 'void' is represented as having no
3882/// parameters, not as having a single void parameter. Such a type can have
3883/// an exception specification, but this specification is not part of the
3884/// canonical type. FunctionProtoType has several trailing objects, some of
3885/// which optional. For more information about the trailing objects see
3886/// the first comment inside FunctionProtoType.
3887class FunctionProtoType final
3888 : public FunctionType,
3889 public llvm::FoldingSetNode,
3890 private llvm::TrailingObjects<
3891 FunctionProtoType, QualType, SourceLocation,
3892 FunctionType::FunctionTypeExtraBitfields, FunctionType::ExceptionType,
3893 Expr *, FunctionDecl *, FunctionType::ExtParameterInfo, Qualifiers> {
3894 friend class ASTContext; // ASTContext creates these.
3895 friend TrailingObjects;
3896
3897 // FunctionProtoType is followed by several trailing objects, some of
3898 // which optional. They are in order:
3899 //
3900 // * An array of getNumParams() QualType holding the parameter types.
3901 // Always present. Note that for the vast majority of FunctionProtoType,
3902 // these will be the only trailing objects.
3903 //
3904 // * Optionally if the function is variadic, the SourceLocation of the
3905 // ellipsis.
3906 //
3907 // * Optionally if some extra data is stored in FunctionTypeExtraBitfields
3908 // (see FunctionTypeExtraBitfields and FunctionTypeBitfields):
3909 // a single FunctionTypeExtraBitfields. Present if and only if
3910 // hasExtraBitfields() is true.
3911 //
3912 // * Optionally exactly one of:
3913 // * an array of getNumExceptions() ExceptionType,
3914 // * a single Expr *,
3915 // * a pair of FunctionDecl *,
3916 // * a single FunctionDecl *
3917 // used to store information about the various types of exception
3918 // specification. See getExceptionSpecSize for the details.
3919 //
3920 // * Optionally an array of getNumParams() ExtParameterInfo holding
3921 // an ExtParameterInfo for each of the parameters. Present if and
3922 // only if hasExtParameterInfos() is true.
3923 //
3924 // * Optionally a Qualifiers object to represent extra qualifiers that can't
3925 // be represented by FunctionTypeBitfields.FastTypeQuals. Present if and only
3926 // if hasExtQualifiers() is true.
3927 //
3928 // The optional FunctionTypeExtraBitfields has to be before the data
3929 // related to the exception specification since it contains the number
3930 // of exception types.
3931 //
3932 // We put the ExtParameterInfos last. If all were equal, it would make
3933 // more sense to put these before the exception specification, because
3934 // it's much easier to skip past them compared to the elaborate switch
3935 // required to skip the exception specification. However, all is not
3936 // equal; ExtParameterInfos are used to model very uncommon features,
3937 // and it's better not to burden the more common paths.
3938
3939public:
3940 /// Holds information about the various types of exception specification.
3941 /// ExceptionSpecInfo is not stored as such in FunctionProtoType but is
3942 /// used to group together the various bits of information about the
3943 /// exception specification.
3944 struct ExceptionSpecInfo {
3945 /// The kind of exception specification this is.
3946 ExceptionSpecificationType Type = EST_None;
3947
3948 /// Explicitly-specified list of exception types.
3949 ArrayRef<QualType> Exceptions;
3950
3951 /// Noexcept expression, if this is a computed noexcept specification.
3952 Expr *NoexceptExpr = nullptr;
3953
3954 /// The function whose exception specification this is, for
3955 /// EST_Unevaluated and EST_Uninstantiated.
3956 FunctionDecl *SourceDecl = nullptr;
3957
3958 /// The function template whose exception specification this is instantiated
3959 /// from, for EST_Uninstantiated.
3960 FunctionDecl *SourceTemplate = nullptr;
3961
3962 ExceptionSpecInfo() = default;
3963
3964 ExceptionSpecInfo(ExceptionSpecificationType EST) : Type(EST) {}
3965 };
3966
3967 /// Extra information about a function prototype. ExtProtoInfo is not
3968 /// stored as such in FunctionProtoType but is used to group together
3969 /// the various bits of extra information about a function prototype.
3970 struct ExtProtoInfo {
3971 FunctionType::ExtInfo ExtInfo;
3972 bool Variadic : 1;
3973 bool HasTrailingReturn : 1;
3974 Qualifiers TypeQuals;
3975 RefQualifierKind RefQualifier = RQ_None;
3976 ExceptionSpecInfo ExceptionSpec;
3977 const ExtParameterInfo *ExtParameterInfos = nullptr;
3978 SourceLocation EllipsisLoc;
3979
3980 ExtProtoInfo() : Variadic(false), HasTrailingReturn(false) {}
3981
3982 ExtProtoInfo(CallingConv CC)
3983 : ExtInfo(CC), Variadic(false), HasTrailingReturn(false) {}
3984
3985 ExtProtoInfo withExceptionSpec(const ExceptionSpecInfo &ESI) {
3986 ExtProtoInfo Result(*this);
3987 Result.ExceptionSpec = ESI;
3988 return Result;
3989 }
3990 };
3991
3992private:
3993 unsigned numTrailingObjects(OverloadToken<QualType>) const {
3994 return getNumParams();
3995 }
3996
3997 unsigned numTrailingObjects(OverloadToken<SourceLocation>) const {
3998 return isVariadic();
3999 }
4000
4001 unsigned numTrailingObjects(OverloadToken<FunctionTypeExtraBitfields>) const {
4002 return hasExtraBitfields();
4003 }
4004
4005 unsigned numTrailingObjects(OverloadToken<ExceptionType>) const {
4006 return getExceptionSpecSize().NumExceptionType;
4007 }
4008
4009 unsigned numTrailingObjects(OverloadToken<Expr *>) const {
4010 return getExceptionSpecSize().NumExprPtr;
4011 }
4012
4013 unsigned numTrailingObjects(OverloadToken<FunctionDecl *>) const {
4014 return getExceptionSpecSize().NumFunctionDeclPtr;
4015 }
4016
4017 unsigned numTrailingObjects(OverloadToken<ExtParameterInfo>) const {
4018 return hasExtParameterInfos() ? getNumParams() : 0;
4019 }
4020
4021 /// Determine whether there are any argument types that
4022 /// contain an unexpanded parameter pack.
4023 static bool containsAnyUnexpandedParameterPack(const QualType *ArgArray,
4024 unsigned numArgs) {
4025 for (unsigned Idx = 0; Idx < numArgs; ++Idx)
4026 if (ArgArray[Idx]->containsUnexpandedParameterPack())
4027 return true;
4028
4029 return false;
4030 }
4031
4032 FunctionProtoType(QualType result, ArrayRef<QualType> params,
4033 QualType canonical, const ExtProtoInfo &epi);
4034
4035 /// This struct is returned by getExceptionSpecSize and is used to
4036 /// translate an ExceptionSpecificationType to the number and kind
4037 /// of trailing objects related to the exception specification.
4038 struct ExceptionSpecSizeHolder {
4039 unsigned NumExceptionType;
4040 unsigned NumExprPtr;
4041 unsigned NumFunctionDeclPtr;
4042 };
4043
4044 /// Return the number and kind of trailing objects
4045 /// related to the exception specification.
4046 static ExceptionSpecSizeHolder
4047 getExceptionSpecSize(ExceptionSpecificationType EST, unsigned NumExceptions) {
4048 switch (EST) {
4049 case EST_None:
4050 case EST_DynamicNone:
4051 case EST_MSAny:
4052 case EST_BasicNoexcept:
4053 case EST_Unparsed:
4054 case EST_NoThrow:
4055 return {0, 0, 0};
4056
4057 case EST_Dynamic:
4058 return {NumExceptions, 0, 0};
4059
4060 case EST_DependentNoexcept:
4061 case EST_NoexceptFalse:
4062 case EST_NoexceptTrue:
4063 return {0, 1, 0};
4064
4065 case EST_Uninstantiated:
4066 return {0, 0, 2};
4067
4068 case EST_Unevaluated:
4069 return {0, 0, 1};
4070 }
4071 llvm_unreachable("bad exception specification kind")__builtin_unreachable();
4072 }
4073
4074 /// Return the number and kind of trailing objects
4075 /// related to the exception specification.
4076 ExceptionSpecSizeHolder getExceptionSpecSize() const {
4077 return getExceptionSpecSize(getExceptionSpecType(), getNumExceptions());
4078 }
4079
4080 /// Whether the trailing FunctionTypeExtraBitfields is present.
4081 static bool hasExtraBitfields(ExceptionSpecificationType EST) {
4082 // If the exception spec type is EST_Dynamic then we have > 0 exception
4083 // types and the exact number is stored in FunctionTypeExtraBitfields.
4084 return EST == EST_Dynamic;
4085 }
4086
4087 /// Whether the trailing FunctionTypeExtraBitfields is present.
4088 bool hasExtraBitfields() const {
4089 return hasExtraBitfields(getExceptionSpecType());
4090 }
4091
4092 bool hasExtQualifiers() const {
4093 return FunctionTypeBits.HasExtQuals;
4094 }
4095
4096public:
4097 unsigned getNumParams() const { return FunctionTypeBits.NumParams; }
4098
4099 QualType getParamType(unsigned i) const {
4100 assert(i < getNumParams() && "invalid parameter index")((void)0);
4101 return param_type_begin()[i];
4102 }
4103
4104 ArrayRef<QualType> getParamTypes() const {
4105 return llvm::makeArrayRef(param_type_begin(), param_type_end());
4106 }
4107
4108 ExtProtoInfo getExtProtoInfo() const {
4109 ExtProtoInfo EPI;
4110 EPI.ExtInfo = getExtInfo();
4111 EPI.Variadic = isVariadic();
4112 EPI.EllipsisLoc = getEllipsisLoc();
4113 EPI.HasTrailingReturn = hasTrailingReturn();
4114 EPI.ExceptionSpec = getExceptionSpecInfo();
4115 EPI.TypeQuals = getMethodQuals();
4116 EPI.RefQualifier = getRefQualifier();
4117 EPI.ExtParameterInfos = getExtParameterInfosOrNull();
4118 return EPI;
4119 }
4120
4121 /// Get the kind of exception specification on this function.
4122 ExceptionSpecificationType getExceptionSpecType() const {
4123 return static_cast<ExceptionSpecificationType>(
4124 FunctionTypeBits.ExceptionSpecType);
4125 }
4126
4127 /// Return whether this function has any kind of exception spec.
4128 bool hasExceptionSpec() const { return getExceptionSpecType() != EST_None; }
4129
4130 /// Return whether this function has a dynamic (throw) exception spec.
4131 bool hasDynamicExceptionSpec() const {
4132 return isDynamicExceptionSpec(getExceptionSpecType());
4133 }
4134
4135 /// Return whether this function has a noexcept exception spec.
4136 bool hasNoexceptExceptionSpec() const {
4137 return isNoexceptExceptionSpec(getExceptionSpecType());
4138 }
4139
4140 /// Return whether this function has a dependent exception spec.
4141 bool hasDependentExceptionSpec() const;
4142
4143 /// Return whether this function has an instantiation-dependent exception
4144 /// spec.
4145 bool hasInstantiationDependentExceptionSpec() const;
4146
4147 /// Return all the available information about this type's exception spec.
4148 ExceptionSpecInfo getExceptionSpecInfo() const {
4149 ExceptionSpecInfo Result;
4150 Result.Type = getExceptionSpecType();
4151 if (Result.Type == EST_Dynamic) {
4152 Result.Exceptions = exceptions();
4153 } else if (isComputedNoexcept(Result.Type)) {
4154 Result.NoexceptExpr = getNoexceptExpr();
4155 } else if (Result.Type == EST_Uninstantiated) {
4156 Result.SourceDecl = getExceptionSpecDecl();
4157 Result.SourceTemplate = getExceptionSpecTemplate();
4158 } else if (Result.Type == EST_Unevaluated) {
4159 Result.SourceDecl = getExceptionSpecDecl();
4160 }
4161 return Result;
4162 }
4163
4164 /// Return the number of types in the exception specification.
4165 unsigned getNumExceptions() const {
4166 return getExceptionSpecType() == EST_Dynamic
4167 ? getTrailingObjects<FunctionTypeExtraBitfields>()
4168 ->NumExceptionType
4169 : 0;
4170 }
4171
4172 /// Return the ith exception type, where 0 <= i < getNumExceptions().
4173 QualType getExceptionType(unsigned i) const {
4174 assert(i < getNumExceptions() && "Invalid exception number!")((void)0);
4175 return exception_begin()[i];
4176 }
4177
4178 /// Return the expression inside noexcept(expression), or a null pointer
4179 /// if there is none (because the exception spec is not of this form).
4180 Expr *getNoexceptExpr() const {
4181 if (!isComputedNoexcept(getExceptionSpecType()))
4182 return nullptr;
4183 return *getTrailingObjects<Expr *>();
4184 }
4185
4186 /// If this function type has an exception specification which hasn't
4187 /// been determined yet (either because it has not been evaluated or because
4188 /// it has not been instantiated), this is the function whose exception
4189 /// specification is represented by this type.
4190 FunctionDecl *getExceptionSpecDecl() const {
4191 if (getExceptionSpecType() != EST_Uninstantiated &&
4192 getExceptionSpecType() != EST_Unevaluated)
4193 return nullptr;
4194 return getTrailingObjects<FunctionDecl *>()[0];
4195 }
4196
4197 /// If this function type has an uninstantiated exception
4198 /// specification, this is the function whose exception specification
4199 /// should be instantiated to find the exception specification for
4200 /// this type.
4201 FunctionDecl *getExceptionSpecTemplate() const {
4202 if (getExceptionSpecType() != EST_Uninstantiated)
4203 return nullptr;
4204 return getTrailingObjects<FunctionDecl *>()[1];
4205 }
4206
4207 /// Determine whether this function type has a non-throwing exception
4208 /// specification.
4209 CanThrowResult canThrow() const;
4210
4211 /// Determine whether this function type has a non-throwing exception
4212 /// specification. If this depends on template arguments, returns
4213 /// \c ResultIfDependent.
4214 bool isNothrow(bool ResultIfDependent = false) const {
4215 return ResultIfDependent ? canThrow() != CT_Can : canThrow() == CT_Cannot;
4216 }
4217
4218 /// Whether this function prototype is variadic.
4219 bool isVariadic() const { return FunctionTypeBits.Variadic; }
4220
4221 SourceLocation getEllipsisLoc() const {
4222 return isVariadic() ? *getTrailingObjects<SourceLocation>()
4223 : SourceLocation();
4224 }
4225
4226 /// Determines whether this function prototype contains a
4227 /// parameter pack at the end.
4228 ///
4229 /// A function template whose last parameter is a parameter pack can be
4230 /// called with an arbitrary number of arguments, much like a variadic
4231 /// function.
4232 bool isTemplateVariadic() const;
4233
4234 /// Whether this function prototype has a trailing return type.
4235 bool hasTrailingReturn() const { return FunctionTypeBits.HasTrailingReturn; }
4236
4237 Qualifiers getMethodQuals() const {
4238 if (hasExtQualifiers())
4239 return *getTrailingObjects<Qualifiers>();
4240 else
4241 return getFastTypeQuals();
4242 }
4243
4244 /// Retrieve the ref-qualifier associated with this function type.
4245 RefQualifierKind getRefQualifier() const {
4246 return static_cast<RefQualifierKind>(FunctionTypeBits.RefQualifier);
4247 }
4248
4249 using param_type_iterator = const QualType *;
4250 using param_type_range = llvm::iterator_range<param_type_iterator>;
4251
4252 param_type_range param_types() const {
4253 return param_type_range(param_type_begin(), param_type_end());
4254 }
4255
4256 param_type_iterator param_type_begin() const {
4257 return getTrailingObjects<QualType>();
4258 }
4259
4260 param_type_iterator param_type_end() const {
4261 return param_type_begin() + getNumParams();
4262 }
4263
4264 using exception_iterator = const QualType *;
4265
4266 ArrayRef<QualType> exceptions() const {
4267 return llvm::makeArrayRef(exception_begin(), exception_end());
4268 }
4269
4270 exception_iterator exception_begin() const {
4271 return reinterpret_cast<exception_iterator>(
4272 getTrailingObjects<ExceptionType>());
4273 }
4274
4275 exception_iterator exception_end() const {
4276 return exception_begin() + getNumExceptions();
4277 }
4278
4279 /// Is there any interesting extra information for any of the parameters
4280 /// of this function type?
4281 bool hasExtParameterInfos() const {
4282 return FunctionTypeBits.HasExtParameterInfos;
4283 }
4284
4285 ArrayRef<ExtParameterInfo> getExtParameterInfos() const {
4286 assert(hasExtParameterInfos())((void)0);
4287 return ArrayRef<ExtParameterInfo>(getTrailingObjects<ExtParameterInfo>(),
4288 getNumParams());
4289 }
4290
4291 /// Return a pointer to the beginning of the array of extra parameter
4292 /// information, if present, or else null if none of the parameters
4293 /// carry it. This is equivalent to getExtProtoInfo().ExtParameterInfos.
4294 const ExtParameterInfo *getExtParameterInfosOrNull() const {
4295 if (!hasExtParameterInfos())
4296 return nullptr;
4297 return getTrailingObjects<ExtParameterInfo>();
4298 }
4299
4300 ExtParameterInfo getExtParameterInfo(unsigned I) const {
4301 assert(I < getNumParams() && "parameter index out of range")((void)0);
4302 if (hasExtParameterInfos())
4303 return getTrailingObjects<ExtParameterInfo>()[I];
4304 return ExtParameterInfo();
4305 }
4306
4307 ParameterABI getParameterABI(unsigned I) const {
4308 assert(I < getNumParams() && "parameter index out of range")((void)0);
4309 if (hasExtParameterInfos())
4310 return getTrailingObjects<ExtParameterInfo>()[I].getABI();
4311 return ParameterABI::Ordinary;
4312 }
4313
4314 bool isParamConsumed(unsigned I) const {
4315 assert(I < getNumParams() && "parameter index out of range")((void)0);
4316 if (hasExtParameterInfos())
4317 return getTrailingObjects<ExtParameterInfo>()[I].isConsumed();
4318 return false;
4319 }
4320
4321 bool isSugared() const { return false; }
4322 QualType desugar() const { return QualType(this, 0); }
4323
4324 void printExceptionSpecification(raw_ostream &OS,
4325 const PrintingPolicy &Policy) const;
4326
4327 static bool classof(const Type *T) {
4328 return T->getTypeClass() == FunctionProto;
4329 }
4330
4331 void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Ctx);
4332 static void Profile(llvm::FoldingSetNodeID &ID, QualType Result,
4333 param_type_iterator ArgTys, unsigned NumArgs,
4334 const ExtProtoInfo &EPI, const ASTContext &Context,
4335 bool Canonical);
4336};
4337
4338/// Represents the dependent type named by a dependently-scoped
4339/// typename using declaration, e.g.
4340/// using typename Base<T>::foo;
4341///
4342/// Template instantiation turns these into the underlying type.
4343class UnresolvedUsingType : public Type {
4344 friend class ASTContext; // ASTContext creates these.
4345
4346 UnresolvedUsingTypenameDecl *Decl;
4347
4348 UnresolvedUsingType(const UnresolvedUsingTypenameDecl *D)
4349 : Type(UnresolvedUsing, QualType(),
4350 TypeDependence::DependentInstantiation),
4351 Decl(const_cast<UnresolvedUsingTypenameDecl *>(D)) {}
4352
4353public:
4354 UnresolvedUsingTypenameDecl *getDecl() const { return Decl; }
4355
4356 bool isSugared() const { return false; }
4357 QualType desugar() const { return QualType(this, 0); }
4358
4359 static bool classof(const Type *T) {
4360 return T->getTypeClass() == UnresolvedUsing;
4361 }
4362
4363 void Profile(llvm::FoldingSetNodeID &ID) {
4364 return Profile(ID, Decl);
4365 }
4366
4367 static void Profile(llvm::FoldingSetNodeID &ID,
4368 UnresolvedUsingTypenameDecl *D) {
4369 ID.AddPointer(D);
4370 }
4371};
4372
4373class TypedefType : public Type {
4374 TypedefNameDecl *Decl;
4375
4376private:
4377 friend class ASTContext; // ASTContext creates these.
4378
4379 TypedefType(TypeClass tc, const TypedefNameDecl *D, QualType underlying,
4380 QualType can);
4381
4382public:
4383 TypedefNameDecl *getDecl() const { return Decl; }
4384
4385 bool isSugared() const { return true; }
4386 QualType desugar() const;
4387
4388 static bool classof(const Type *T) { return T->getTypeClass() == Typedef; }
4389};
4390
4391/// Sugar type that represents a type that was qualified by a qualifier written
4392/// as a macro invocation.
4393class MacroQualifiedType : public Type {
4394 friend class ASTContext; // ASTContext creates these.
4395
4396 QualType UnderlyingTy;
4397 const IdentifierInfo *MacroII;
4398
4399 MacroQualifiedType(QualType UnderlyingTy, QualType CanonTy,
4400 const IdentifierInfo *MacroII)
4401 : Type(MacroQualified, CanonTy, UnderlyingTy->getDependence()),
4402 UnderlyingTy(UnderlyingTy), MacroII(MacroII) {
4403 assert(isa<AttributedType>(UnderlyingTy) &&((void)0)
4404 "Expected a macro qualified type to only wrap attributed types.")((void)0);
4405 }
4406
4407public:
4408 const IdentifierInfo *getMacroIdentifier() const { return MacroII; }
4409 QualType getUnderlyingType() const { return UnderlyingTy; }
4410
4411 /// Return this attributed type's modified type with no qualifiers attached to
4412 /// it.
4413 QualType getModifiedType() const;
4414
4415 bool isSugared() const { return true; }
4416 QualType desugar() const;
4417
4418 static bool classof(const Type *T) {
4419 return T->getTypeClass() == MacroQualified;
4420 }
4421};
4422
4423/// Represents a `typeof` (or __typeof__) expression (a GCC extension).
4424class TypeOfExprType : public Type {
4425 Expr *TOExpr;
4426
4427protected:
4428 friend class ASTContext; // ASTContext creates these.
4429
4430 TypeOfExprType(Expr *E, QualType can = QualType());
4431
4432public:
4433 Expr *getUnderlyingExpr() const { return TOExpr; }
4434
4435 /// Remove a single level of sugar.
4436 QualType desugar() const;
4437
4438 /// Returns whether this type directly provides sugar.
4439 bool isSugared() const;
4440
4441 static bool classof(const Type *T) { return T->getTypeClass() == TypeOfExpr; }
4442};
4443
4444/// Internal representation of canonical, dependent
4445/// `typeof(expr)` types.
4446///
4447/// This class is used internally by the ASTContext to manage
4448/// canonical, dependent types, only. Clients will only see instances
4449/// of this class via TypeOfExprType nodes.
4450class DependentTypeOfExprType
4451 : public TypeOfExprType, public llvm::FoldingSetNode {
4452 const ASTContext &Context;
4453
4454public:
4455 DependentTypeOfExprType(const ASTContext &Context, Expr *E)
4456 : TypeOfExprType(E), Context(Context) {}
4457
4458 void Profile(llvm::FoldingSetNodeID &ID) {
4459 Profile(ID, Context, getUnderlyingExpr());
4460 }
4461
4462 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
4463 Expr *E);
4464};
4465
4466/// Represents `typeof(type)`, a GCC extension.
4467class TypeOfType : public Type {
4468 friend class ASTContext; // ASTContext creates these.
4469
4470 QualType TOType;
4471
4472 TypeOfType(QualType T, QualType can)
4473 : Type(TypeOf, can, T->getDependence()), TOType(T) {
4474 assert(!isa<TypedefType>(can) && "Invalid canonical type")((void)0);
4475 }
4476
4477public:
4478 QualType getUnderlyingType() const { return TOType; }
4479
4480 /// Remove a single level of sugar.
4481 QualType desugar() const { return getUnderlyingType(); }
4482
4483 /// Returns whether this type directly provides sugar.
4484 bool isSugared() const { return true; }
4485
4486 static bool classof(const Type *T) { return T->getTypeClass() == TypeOf; }
4487};
4488
4489/// Represents the type `decltype(expr)` (C++11).
4490class DecltypeType : public Type {
4491 Expr *E;
4492 QualType UnderlyingType;
4493
4494protected:
4495 friend class ASTContext; // ASTContext creates these.
4496
4497 DecltypeType(Expr *E, QualType underlyingType, QualType can = QualType());
4498
4499public:
4500 Expr *getUnderlyingExpr() const { return E; }
4501 QualType getUnderlyingType() const { return UnderlyingType; }
4502
4503 /// Remove a single level of sugar.
4504 QualType desugar() const;
4505
4506 /// Returns whether this type directly provides sugar.
4507 bool isSugared() const;
4508
4509 static bool classof(const Type *T) { return T->getTypeClass() == Decltype; }
4510};
4511
4512/// Internal representation of canonical, dependent
4513/// decltype(expr) types.
4514///
4515/// This class is used internally by the ASTContext to manage
4516/// canonical, dependent types, only. Clients will only see instances
4517/// of this class via DecltypeType nodes.
4518class DependentDecltypeType : public DecltypeType, public llvm::FoldingSetNode {
4519 const ASTContext &Context;
4520
4521public:
4522 DependentDecltypeType(const ASTContext &Context, Expr *E);
4523
4524 void Profile(llvm::FoldingSetNodeID &ID) {
4525 Profile(ID, Context, getUnderlyingExpr());
4526 }
4527
4528 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
4529 Expr *E);
4530};
4531
4532/// A unary type transform, which is a type constructed from another.
4533class UnaryTransformType : public Type {
4534public:
4535 enum UTTKind {
4536 EnumUnderlyingType
4537 };
4538
4539private:
4540 /// The untransformed type.
4541 QualType BaseType;
4542
4543 /// The transformed type if not dependent, otherwise the same as BaseType.
4544 QualType UnderlyingType;
4545
4546 UTTKind UKind;
4547
4548protected:
4549 friend class ASTContext;
4550
4551 UnaryTransformType(QualType BaseTy, QualType UnderlyingTy, UTTKind UKind,
4552 QualType CanonicalTy);
4553
4554public:
4555 bool isSugared() const { return !isDependentType(); }
4556 QualType desugar() const { return UnderlyingType; }
4557
4558 QualType getUnderlyingType() const { return UnderlyingType; }
4559 QualType getBaseType() const { return BaseType; }
4560
4561 UTTKind getUTTKind() const { return UKind; }
4562
4563 static bool classof(const Type *T) {
4564 return T->getTypeClass() == UnaryTransform;
4565 }
4566};
4567
4568/// Internal representation of canonical, dependent
4569/// __underlying_type(type) types.
4570///
4571/// This class is used internally by the ASTContext to manage
4572/// canonical, dependent types, only. Clients will only see instances
4573/// of this class via UnaryTransformType nodes.
4574class DependentUnaryTransformType : public UnaryTransformType,
4575 public llvm::FoldingSetNode {
4576public:
4577 DependentUnaryTransformType(const ASTContext &C, QualType BaseType,
4578 UTTKind UKind);
4579
4580 void Profile(llvm::FoldingSetNodeID &ID) {
4581 Profile(ID, getBaseType(), getUTTKind());
4582 }
4583
4584 static void Profile(llvm::FoldingSetNodeID &ID, QualType BaseType,
4585 UTTKind UKind) {
4586 ID.AddPointer(BaseType.getAsOpaquePtr());
4587 ID.AddInteger((unsigned)UKind);
4588 }
4589};
4590
4591class TagType : public Type {
4592 friend class ASTReader;
4593 template <class T> friend class serialization::AbstractTypeReader;
4594
4595 /// Stores the TagDecl associated with this type. The decl may point to any
4596 /// TagDecl that declares the entity.
4597 TagDecl *decl;
4598
4599protected:
4600 TagType(TypeClass TC, const TagDecl *D, QualType can);
4601
4602public:
4603 TagDecl *getDecl() const;
4604
4605 /// Determines whether this type is in the process of being defined.
4606 bool isBeingDefined() const;
4607
4608 static bool classof(const Type *T) {
4609 return T->getTypeClass() == Enum || T->getTypeClass() == Record;
4610 }
4611};
4612
4613/// A helper class that allows the use of isa/cast/dyncast
4614/// to detect TagType objects of structs/unions/classes.
4615class RecordType : public TagType {
4616protected:
4617 friend class ASTContext; // ASTContext creates these.
4618
4619 explicit RecordType(const RecordDecl *D)
4620 : TagType(Record, reinterpret_cast<const TagDecl*>(D), QualType()) {}
4621 explicit RecordType(TypeClass TC, RecordDecl *D)
4622 : TagType(TC, reinterpret_cast<const TagDecl*>(D), QualType()) {}
4623
4624public:
4625 RecordDecl *getDecl() const {
4626 return reinterpret_cast<RecordDecl*>(TagType::getDecl());
4627 }
4628
4629 /// Recursively check all fields in the record for const-ness. If any field
4630 /// is declared const, return true. Otherwise, return false.
4631 bool hasConstFields() const;
4632
4633 bool isSugared() const { return false; }
4634 QualType desugar() const { return QualType(this, 0); }
4635
4636 static bool classof(const Type *T) { return T->getTypeClass() == Record; }
4637};
4638
4639/// A helper class that allows the use of isa/cast/dyncast
4640/// to detect TagType objects of enums.
4641class EnumType : public TagType {
4642 friend class ASTContext; // ASTContext creates these.
4643
4644 explicit EnumType(const EnumDecl *D)
4645 : TagType(Enum, reinterpret_cast<const TagDecl*>(D), QualType()) {}
4646
4647public:
4648 EnumDecl *getDecl() const {
4649 return reinterpret_cast<EnumDecl*>(TagType::getDecl());
4650 }
4651
4652 bool isSugared() const { return false; }
4653 QualType desugar() const { return QualType(this, 0); }
4654
4655 static bool classof(const Type *T) { return T->getTypeClass() == Enum; }
4656};
4657
4658/// An attributed type is a type to which a type attribute has been applied.
4659///
4660/// The "modified type" is the fully-sugared type to which the attributed
4661/// type was applied; generally it is not canonically equivalent to the
4662/// attributed type. The "equivalent type" is the minimally-desugared type
4663/// which the type is canonically equivalent to.
4664///
4665/// For example, in the following attributed type:
4666/// int32_t __attribute__((vector_size(16)))
4667/// - the modified type is the TypedefType for int32_t
4668/// - the equivalent type is VectorType(16, int32_t)
4669/// - the canonical type is VectorType(16, int)
4670class AttributedType : public Type, public llvm::FoldingSetNode {
4671public:
4672 using Kind = attr::Kind;
4673
4674private:
4675 friend class ASTContext; // ASTContext creates these
4676
4677 QualType ModifiedType;
4678 QualType EquivalentType;
4679
4680 AttributedType(QualType canon, attr::Kind attrKind, QualType modified,
4681 QualType equivalent)
4682 : Type(Attributed, canon, equivalent->getDependence()),
4683 ModifiedType(modified), EquivalentType(equivalent) {
4684 AttributedTypeBits.AttrKind = attrKind;
4685 }
4686
4687public:
4688 Kind getAttrKind() const {
4689 return static_cast<Kind>(AttributedTypeBits.AttrKind);
4690 }
4691
4692 QualType getModifiedType() const { return ModifiedType; }
4693 QualType getEquivalentType() const { return EquivalentType; }
4694
4695 bool isSugared() const { return true; }
4696 QualType desugar() const { return getEquivalentType(); }
4697
4698 /// Does this attribute behave like a type qualifier?
4699 ///
4700 /// A type qualifier adjusts a type to provide specialized rules for
4701 /// a specific object, like the standard const and volatile qualifiers.
4702 /// This includes attributes controlling things like nullability,
4703 /// address spaces, and ARC ownership. The value of the object is still
4704 /// largely described by the modified type.
4705 ///
4706 /// In contrast, many type attributes "rewrite" their modified type to
4707 /// produce a fundamentally different type, not necessarily related in any
4708 /// formalizable way to the original type. For example, calling convention
4709 /// and vector attributes are not simple type qualifiers.
4710 ///
4711 /// Type qualifiers are often, but not always, reflected in the canonical
4712 /// type.
4713 bool isQualifier() const;
4714
4715 bool isMSTypeSpec() const;
4716
4717 bool isCallingConv() const;
4718
4719 llvm::Optional<NullabilityKind> getImmediateNullability() const;
4720
4721 /// Retrieve the attribute kind corresponding to the given
4722 /// nullability kind.
4723 static Kind getNullabilityAttrKind(NullabilityKind kind) {
4724 switch (kind) {
4725 case NullabilityKind::NonNull:
4726 return attr::TypeNonNull;
4727
4728 case NullabilityKind::Nullable:
4729 return attr::TypeNullable;
4730
4731 case NullabilityKind::NullableResult:
4732 return attr::TypeNullableResult;
4733
4734 case NullabilityKind::Unspecified:
4735 return attr::TypeNullUnspecified;
4736 }
4737 llvm_unreachable("Unknown nullability kind.")__builtin_unreachable();
4738 }
4739
4740 /// Strip off the top-level nullability annotation on the given
4741 /// type, if it's there.
4742 ///
4743 /// \param T The type to strip. If the type is exactly an
4744 /// AttributedType specifying nullability (without looking through
4745 /// type sugar), the nullability is returned and this type changed
4746 /// to the underlying modified type.
4747 ///
4748 /// \returns the top-level nullability, if present.
4749 static Optional<NullabilityKind> stripOuterNullability(QualType &T);
4750
4751 void Profile(llvm::FoldingSetNodeID &ID) {
4752 Profile(ID, getAttrKind(), ModifiedType, EquivalentType);
4753 }
4754
4755 static void Profile(llvm::FoldingSetNodeID &ID, Kind attrKind,
4756 QualType modified, QualType equivalent) {
4757 ID.AddInteger(attrKind);
4758 ID.AddPointer(modified.getAsOpaquePtr());
4759 ID.AddPointer(equivalent.getAsOpaquePtr());
4760 }
4761
4762 static bool classof(const Type *T) {
4763 return T->getTypeClass() == Attributed;
4764 }
4765};
4766
4767class TemplateTypeParmType : public Type, public llvm::FoldingSetNode {
4768 friend class ASTContext; // ASTContext creates these
4769
4770 // Helper data collector for canonical types.
4771 struct CanonicalTTPTInfo {
4772 unsigned Depth : 15;
4773 unsigned ParameterPack : 1;
4774 unsigned Index : 16;
4775 };
4776
4777 union {
4778 // Info for the canonical type.
4779 CanonicalTTPTInfo CanTTPTInfo;
4780
4781 // Info for the non-canonical type.
4782 TemplateTypeParmDecl *TTPDecl;
4783 };
4784
4785 /// Build a non-canonical type.
4786 TemplateTypeParmType(TemplateTypeParmDecl *TTPDecl, QualType Canon)
4787 : Type(TemplateTypeParm, Canon,
4788 TypeDependence::DependentInstantiation |
4789 (Canon->getDependence() & TypeDependence::UnexpandedPack)),
4790 TTPDecl(TTPDecl) {}
4791
4792 /// Build the canonical type.
4793 TemplateTypeParmType(unsigned D, unsigned I, bool PP)
4794 : Type(TemplateTypeParm, QualType(this, 0),
4795 TypeDependence::DependentInstantiation |
4796 (PP ? TypeDependence::UnexpandedPack : TypeDependence::None)) {
4797 CanTTPTInfo.Depth = D;
4798 CanTTPTInfo.Index = I;
4799 CanTTPTInfo.ParameterPack = PP;
4800 }
4801
4802 const CanonicalTTPTInfo& getCanTTPTInfo() const {
4803 QualType Can = getCanonicalTypeInternal();
4804 return Can->castAs<TemplateTypeParmType>()->CanTTPTInfo;
4805 }
4806
4807public:
4808 unsigned getDepth() const { return getCanTTPTInfo().Depth; }
4809 unsigned getIndex() const { return getCanTTPTInfo().Index; }
4810 bool isParameterPack() const { return getCanTTPTInfo().ParameterPack; }
4811
4812 TemplateTypeParmDecl *getDecl() const {
4813 return isCanonicalUnqualified() ? nullptr : TTPDecl;
4814 }
4815
4816 IdentifierInfo *getIdentifier() const;
4817
4818 bool isSugared() const { return false; }
4819 QualType desugar() const { return QualType(this, 0); }
4820
4821 void Profile(llvm::FoldingSetNodeID &ID) {
4822 Profile(ID, getDepth(), getIndex(), isParameterPack(), getDecl());
4823 }
4824
4825 static void Profile(llvm::FoldingSetNodeID &ID, unsigned Depth,
4826 unsigned Index, bool ParameterPack,
4827 TemplateTypeParmDecl *TTPDecl) {
4828 ID.AddInteger(Depth);
4829 ID.AddInteger(Index);
4830 ID.AddBoolean(ParameterPack);
4831 ID.AddPointer(TTPDecl);
4832 }
4833
4834 static bool classof(const Type *T) {
4835 return T->getTypeClass() == TemplateTypeParm;
4836 }
4837};
4838
4839/// Represents the result of substituting a type for a template
4840/// type parameter.
4841///
4842/// Within an instantiated template, all template type parameters have
4843/// been replaced with these. They are used solely to record that a
4844/// type was originally written as a template type parameter;
4845/// therefore they are never canonical.
4846class SubstTemplateTypeParmType : public Type, public llvm::FoldingSetNode {
4847 friend class ASTContext;
4848
4849 // The original type parameter.
4850 const TemplateTypeParmType *Replaced;
4851
4852 SubstTemplateTypeParmType(const TemplateTypeParmType *Param, QualType Canon)
4853 : Type(SubstTemplateTypeParm, Canon, Canon->getDependence()),
4854 Replaced(Param) {}
4855
4856public:
4857 /// Gets the template parameter that was substituted for.
4858 const TemplateTypeParmType *getReplacedParameter() const {
4859 return Replaced;
4860 }
4861
4862 /// Gets the type that was substituted for the template
4863 /// parameter.
4864 QualType getReplacementType() const {
4865 return getCanonicalTypeInternal();
4866 }
4867
4868 bool isSugared() const { return true; }
4869 QualType desugar() const { return getReplacementType(); }
4870
4871 void Profile(llvm::FoldingSetNodeID &ID) {
4872 Profile(ID, getReplacedParameter(), getReplacementType());
4873 }
4874
4875 static void Profile(llvm::FoldingSetNodeID &ID,
4876 const TemplateTypeParmType *Replaced,
4877 QualType Replacement) {
4878 ID.AddPointer(Replaced);
4879 ID.AddPointer(Replacement.getAsOpaquePtr());
4880 }
4881
4882 static bool classof(const Type *T) {
4883 return T->getTypeClass() == SubstTemplateTypeParm;
4884 }
4885};
4886
4887/// Represents the result of substituting a set of types for a template
4888/// type parameter pack.
4889///
4890/// When a pack expansion in the source code contains multiple parameter packs
4891/// and those parameter packs correspond to different levels of template
4892/// parameter lists, this type node is used to represent a template type
4893/// parameter pack from an outer level, which has already had its argument pack
4894/// substituted but that still lives within a pack expansion that itself
4895/// could not be instantiated. When actually performing a substitution into
4896/// that pack expansion (e.g., when all template parameters have corresponding
4897/// arguments), this type will be replaced with the \c SubstTemplateTypeParmType
4898/// at the current pack substitution index.
4899class SubstTemplateTypeParmPackType : public Type, public llvm::FoldingSetNode {
4900 friend class ASTContext;
4901
4902 /// The original type parameter.
4903 const TemplateTypeParmType *Replaced;
4904
4905 /// A pointer to the set of template arguments that this
4906 /// parameter pack is instantiated with.
4907 const TemplateArgument *Arguments;
4908
4909 SubstTemplateTypeParmPackType(const TemplateTypeParmType *Param,
4910 QualType Canon,
4911 const TemplateArgument &ArgPack);
4912
4913public:
4914 IdentifierInfo *getIdentifier() const { return Replaced->getIdentifier(); }
4915
4916 /// Gets the template parameter that was substituted for.
4917 const TemplateTypeParmType *getReplacedParameter() const {
4918 return Replaced;
4919 }
4920
4921 unsigned getNumArgs() const {
4922 return SubstTemplateTypeParmPackTypeBits.NumArgs;
4923 }
4924
4925 bool isSugared() const { return false; }
4926 QualType desugar() const { return QualType(this, 0); }
4927
4928 TemplateArgument getArgumentPack() const;
4929
4930 void Profile(llvm::FoldingSetNodeID &ID);
4931 static void Profile(llvm::FoldingSetNodeID &ID,
4932 const TemplateTypeParmType *Replaced,
4933 const TemplateArgument &ArgPack);
4934
4935 static bool classof(const Type *T) {
4936 return T->getTypeClass() == SubstTemplateTypeParmPack;
4937 }
4938};
4939
4940/// Common base class for placeholders for types that get replaced by
4941/// placeholder type deduction: C++11 auto, C++14 decltype(auto), C++17 deduced
4942/// class template types, and constrained type names.
4943///
4944/// These types are usually a placeholder for a deduced type. However, before
4945/// the initializer is attached, or (usually) if the initializer is
4946/// type-dependent, there is no deduced type and the type is canonical. In
4947/// the latter case, it is also a dependent type.
4948class DeducedType : public Type {
4949protected:
4950 DeducedType(TypeClass TC, QualType DeducedAsType,
4951 TypeDependence ExtraDependence)
4952 : Type(TC,
4953 // FIXME: Retain the sugared deduced type?
4954 DeducedAsType.isNull() ? QualType(this, 0)
4955 : DeducedAsType.getCanonicalType(),
4956 ExtraDependence | (DeducedAsType.isNull()
4957 ? TypeDependence::None
4958 : DeducedAsType->getDependence() &
4959 ~TypeDependence::VariablyModified)) {}
4960
4961public:
4962 bool isSugared() const { return !isCanonicalUnqualified(); }
4963 QualType desugar() const { return getCanonicalTypeInternal(); }
4964
4965 /// Get the type deduced for this placeholder type, or null if it's
4966 /// either not been deduced or was deduced to a dependent type.
4967 QualType getDeducedType() const {
4968 return !isCanonicalUnqualified() ? getCanonicalTypeInternal() : QualType();
4969 }
4970 bool isDeduced() const {
4971 return !isCanonicalUnqualified() || isDependentType();
4972 }
4973
4974 static bool classof(const Type *T) {
4975 return T->getTypeClass() == Auto ||
4976 T->getTypeClass() == DeducedTemplateSpecialization;
4977 }
4978};
4979
4980/// Represents a C++11 auto or C++14 decltype(auto) type, possibly constrained
4981/// by a type-constraint.
4982class alignas(8) AutoType : public DeducedType, public llvm::FoldingSetNode {
4983 friend class ASTContext; // ASTContext creates these
4984
4985 ConceptDecl *TypeConstraintConcept;
4986
4987 AutoType(QualType DeducedAsType, AutoTypeKeyword Keyword,
4988 TypeDependence ExtraDependence, ConceptDecl *CD,
4989 ArrayRef<TemplateArgument> TypeConstraintArgs);
4990
4991 const TemplateArgument *getArgBuffer() const {
4992 return reinterpret_cast<const TemplateArgument*>(this+1);
4993 }
4994
4995 TemplateArgument *getArgBuffer() {
4996 return reinterpret_cast<TemplateArgument*>(this+1);
4997 }
4998
4999public:
5000 /// Retrieve the template arguments.
5001 const TemplateArgument *getArgs() const {
5002 return getArgBuffer();
5003 }
5004
5005 /// Retrieve the number of template arguments.
5006 unsigned getNumArgs() const {
5007 return AutoTypeBits.NumArgs;
5008 }
5009
5010 const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h
5011
5012 ArrayRef<TemplateArgument> getTypeConstraintArguments() const {
5013 return {getArgs(), getNumArgs()};
5014 }
5015
5016 ConceptDecl *getTypeConstraintConcept() const {
5017 return TypeConstraintConcept;
5018 }
5019
5020 bool isConstrained() const {
5021 return TypeConstraintConcept != nullptr;
5022 }
5023
5024 bool isDecltypeAuto() const {
5025 return getKeyword() == AutoTypeKeyword::DecltypeAuto;
5026 }
5027
5028 AutoTypeKeyword getKeyword() const {
5029 return (AutoTypeKeyword)AutoTypeBits.Keyword;
5030 }
5031
5032 void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context) {
5033 Profile(ID, Context, getDeducedType(), getKeyword(), isDependentType(),
5034 getTypeConstraintConcept(), getTypeConstraintArguments());
5035 }
5036
5037 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
5038 QualType Deduced, AutoTypeKeyword Keyword,
5039 bool IsDependent, ConceptDecl *CD,
5040 ArrayRef<TemplateArgument> Arguments);
5041
5042 static bool classof(const Type *T) {
5043 return T->getTypeClass() == Auto;
5044 }
5045};
5046
5047/// Represents a C++17 deduced template specialization type.
5048class DeducedTemplateSpecializationType : public DeducedType,
5049 public llvm::FoldingSetNode {
5050 friend class ASTContext; // ASTContext creates these
5051
5052 /// The name of the template whose arguments will be deduced.
5053 TemplateName Template;
5054
5055 DeducedTemplateSpecializationType(TemplateName Template,
5056 QualType DeducedAsType,
5057 bool IsDeducedAsDependent)
5058 : DeducedType(DeducedTemplateSpecialization, DeducedAsType,
5059 toTypeDependence(Template.getDependence()) |
5060 (IsDeducedAsDependent
5061 ? TypeDependence::DependentInstantiation
5062 : TypeDependence::None)),
5063 Template(Template) {}
5064
5065public:
5066 /// Retrieve the name of the template that we are deducing.
5067 TemplateName getTemplateName() const { return Template;}
5068
5069 void Profile(llvm::FoldingSetNodeID &ID) {
5070 Profile(ID, getTemplateName(), getDeducedType(), isDependentType());
5071 }
5072
5073 static void Profile(llvm::FoldingSetNodeID &ID, TemplateName Template,
5074 QualType Deduced, bool IsDependent) {
5075 Template.Profile(ID);
5076 ID.AddPointer(Deduced.getAsOpaquePtr());
5077 ID.AddBoolean(IsDependent);
5078 }
5079
5080 static bool classof(const Type *T) {
5081 return T->getTypeClass() == DeducedTemplateSpecialization;
5082 }
5083};
5084
5085/// Represents a type template specialization; the template
5086/// must be a class template, a type alias template, or a template
5087/// template parameter. A template which cannot be resolved to one of
5088/// these, e.g. because it is written with a dependent scope
5089/// specifier, is instead represented as a
5090/// @c DependentTemplateSpecializationType.
5091///
5092/// A non-dependent template specialization type is always "sugar",
5093/// typically for a \c RecordType. For example, a class template
5094/// specialization type of \c vector<int> will refer to a tag type for
5095/// the instantiation \c std::vector<int, std::allocator<int>>
5096///
5097/// Template specializations are dependent if either the template or
5098/// any of the template arguments are dependent, in which case the
5099/// type may also be canonical.
5100///
5101/// Instances of this type are allocated with a trailing array of
5102/// TemplateArguments, followed by a QualType representing the
5103/// non-canonical aliased type when the template is a type alias
5104/// template.
5105class alignas(8) TemplateSpecializationType
5106 : public Type,
5107 public llvm::FoldingSetNode {
5108 friend class ASTContext; // ASTContext creates these
5109
5110 /// The name of the template being specialized. This is
5111 /// either a TemplateName::Template (in which case it is a
5112 /// ClassTemplateDecl*, a TemplateTemplateParmDecl*, or a
5113 /// TypeAliasTemplateDecl*), a
5114 /// TemplateName::SubstTemplateTemplateParmPack, or a
5115 /// TemplateName::SubstTemplateTemplateParm (in which case the
5116 /// replacement must, recursively, be one of these).
5117 TemplateName Template;
5118
5119 TemplateSpecializationType(TemplateName T,
5120 ArrayRef<TemplateArgument> Args,
5121 QualType Canon,
5122 QualType Aliased);
5123
5124public:
5125 /// Determine whether any of the given template arguments are dependent.
5126 ///
5127 /// The converted arguments should be supplied when known; whether an
5128 /// argument is dependent can depend on the conversions performed on it
5129 /// (for example, a 'const int' passed as a template argument might be
5130 /// dependent if the parameter is a reference but non-dependent if the
5131 /// parameter is an int).
5132 ///
5133 /// Note that the \p Args parameter is unused: this is intentional, to remind
5134 /// the caller that they need to pass in the converted arguments, not the
5135 /// specified arguments.
5136 static bool
5137 anyDependentTemplateArguments(ArrayRef<TemplateArgumentLoc> Args,
5138 ArrayRef<TemplateArgument> Converted);
5139 static bool
5140 anyDependentTemplateArguments(const TemplateArgumentListInfo &,
5141 ArrayRef<TemplateArgument> Converted);
5142 static bool anyInstantiationDependentTemplateArguments(
5143 ArrayRef<TemplateArgumentLoc> Args);
5144
5145 /// True if this template specialization type matches a current
5146 /// instantiation in the context in which it is found.
5147 bool isCurrentInstantiation() const {
5148 return isa<InjectedClassNameType>(getCanonicalTypeInternal());
5149 }
5150
5151 /// Determine if this template specialization type is for a type alias
5152 /// template that has been substituted.
5153 ///
5154 /// Nearly every template specialization type whose template is an alias
5155 /// template will be substituted. However, this is not the case when
5156 /// the specialization contains a pack expansion but the template alias
5157 /// does not have a corresponding parameter pack, e.g.,
5158 ///
5159 /// \code
5160 /// template<typename T, typename U, typename V> struct S;
5161 /// template<typename T, typename U> using A = S<T, int, U>;
5162 /// template<typename... Ts> struct X {
5163 /// typedef A<Ts...> type; // not a type alias
5164 /// };
5165 /// \endcode
5166 bool isTypeAlias() const { return TemplateSpecializationTypeBits.TypeAlias; }
5167
5168 /// Get the aliased type, if this is a specialization of a type alias
5169 /// template.
5170 QualType getAliasedType() const {
5171 assert(isTypeAlias() && "not a type alias template specialization")((void)0);
5172 return *reinterpret_cast<const QualType*>(end());
5173 }
5174
5175 using iterator = const TemplateArgument *;
5176
5177 iterator begin() const { return getArgs(); }
5178 iterator end() const; // defined inline in TemplateBase.h
5179
5180 /// Retrieve the name of the template that we are specializing.
5181 TemplateName getTemplateName() const { return Template; }
5182
5183 /// Retrieve the template arguments.
5184 const TemplateArgument *getArgs() const {
5185 return reinterpret_cast<const TemplateArgument *>(this + 1);
5186 }
5187
5188 /// Retrieve the number of template arguments.
5189 unsigned getNumArgs() const {
5190 return TemplateSpecializationTypeBits.NumArgs;
5191 }
5192
5193 /// Retrieve a specific template argument as a type.
5194 /// \pre \c isArgType(Arg)
5195 const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h
5196
5197 ArrayRef<TemplateArgument> template_arguments() const {
5198 return {getArgs(), getNumArgs()};
5199 }
5200
5201 bool isSugared() const {
5202 return !isDependentType() || isCurrentInstantiation() || isTypeAlias();
5203 }
5204
5205 QualType desugar() const {
5206 return isTypeAlias() ? getAliasedType() : getCanonicalTypeInternal();
5207 }
5208
5209 void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Ctx) {
5210 Profile(ID, Template, template_arguments(), Ctx);
5211 if (isTypeAlias())
5212 getAliasedType().Profile(ID);
5213 }
5214
5215 static void Profile(llvm::FoldingSetNodeID &ID, TemplateName T,
5216 ArrayRef<TemplateArgument> Args,
5217 const ASTContext &Context);
5218
5219 static bool classof(const Type *T) {
5220 return T->getTypeClass() == TemplateSpecialization;
5221 }
5222};
5223
5224/// Print a template argument list, including the '<' and '>'
5225/// enclosing the template arguments.
5226void printTemplateArgumentList(raw_ostream &OS,
5227 ArrayRef<TemplateArgument> Args,
5228 const PrintingPolicy &Policy,
5229 const TemplateParameterList *TPL = nullptr);
5230
5231void printTemplateArgumentList(raw_ostream &OS,
5232 ArrayRef<TemplateArgumentLoc> Args,
5233 const PrintingPolicy &Policy,
5234 const TemplateParameterList *TPL = nullptr);
5235
5236void printTemplateArgumentList(raw_ostream &OS,
5237 const TemplateArgumentListInfo &Args,
5238 const PrintingPolicy &Policy,
5239 const TemplateParameterList *TPL = nullptr);
5240
5241/// The injected class name of a C++ class template or class
5242/// template partial specialization. Used to record that a type was
5243/// spelled with a bare identifier rather than as a template-id; the
5244/// equivalent for non-templated classes is just RecordType.
5245///
5246/// Injected class name types are always dependent. Template
5247/// instantiation turns these into RecordTypes.
5248///
5249/// Injected class name types are always canonical. This works
5250/// because it is impossible to compare an injected class name type
5251/// with the corresponding non-injected template type, for the same
5252/// reason that it is impossible to directly compare template
5253/// parameters from different dependent contexts: injected class name
5254/// types can only occur within the scope of a particular templated
5255/// declaration, and within that scope every template specialization
5256/// will canonicalize to the injected class name (when appropriate
5257/// according to the rules of the language).
5258class InjectedClassNameType : public Type {
5259 friend class ASTContext; // ASTContext creates these.
5260 friend class ASTNodeImporter;
5261 friend class ASTReader; // FIXME: ASTContext::getInjectedClassNameType is not
5262 // currently suitable for AST reading, too much
5263 // interdependencies.
5264 template <class T> friend class serialization::AbstractTypeReader;
5265
5266 CXXRecordDecl *Decl;
5267
5268 /// The template specialization which this type represents.
5269 /// For example, in
5270 /// template <class T> class A { ... };
5271 /// this is A<T>, whereas in
5272 /// template <class X, class Y> class A<B<X,Y> > { ... };
5273 /// this is A<B<X,Y> >.
5274 ///
5275 /// It is always unqualified, always a template specialization type,
5276 /// and always dependent.
5277 QualType InjectedType;
5278
5279 InjectedClassNameType(CXXRecordDecl *D, QualType TST)
5280 : Type(InjectedClassName, QualType(),
5281 TypeDependence::DependentInstantiation),
5282 Decl(D), InjectedType(TST) {
5283 assert(isa<TemplateSpecializationType>(TST))((void)0);
5284 assert(!TST.hasQualifiers())((void)0);
5285 assert(TST->isDependentType())((void)0);
5286 }
5287
5288public:
5289 QualType getInjectedSpecializationType() const { return InjectedType; }
5290
5291 const TemplateSpecializationType *getInjectedTST() const {
5292 return cast<TemplateSpecializationType>(InjectedType.getTypePtr());
5293 }
5294
5295 TemplateName getTemplateName() const {
5296 return getInjectedTST()->getTemplateName();
5297 }
5298
5299 CXXRecordDecl *getDecl() const;
5300
5301 bool isSugared() const { return false; }
5302 QualType desugar() const { return QualType(this, 0); }
5303
5304 static bool classof(const Type *T) {
5305 return T->getTypeClass() == InjectedClassName;
5306 }
5307};
5308
5309/// The kind of a tag type.
5310enum TagTypeKind {
5311 /// The "struct" keyword.
5312 TTK_Struct,
5313
5314 /// The "__interface" keyword.
5315 TTK_Interface,
5316
5317 /// The "union" keyword.
5318 TTK_Union,
5319
5320 /// The "class" keyword.
5321 TTK_Class,
5322
5323 /// The "enum" keyword.
5324 TTK_Enum
5325};
5326
5327/// The elaboration keyword that precedes a qualified type name or
5328/// introduces an elaborated-type-specifier.
5329enum ElaboratedTypeKeyword {
5330 /// The "struct" keyword introduces the elaborated-type-specifier.
5331 ETK_Struct,
5332
5333 /// The "__interface" keyword introduces the elaborated-type-specifier.
5334 ETK_Interface,
5335
5336 /// The "union" keyword introduces the elaborated-type-specifier.
5337 ETK_Union,
5338
5339 /// The "class" keyword introduces the elaborated-type-specifier.
5340 ETK_Class,
5341
5342 /// The "enum" keyword introduces the elaborated-type-specifier.
5343 ETK_Enum,
5344
5345 /// The "typename" keyword precedes the qualified type name, e.g.,
5346 /// \c typename T::type.
5347 ETK_Typename,
5348
5349 /// No keyword precedes the qualified type name.
5350 ETK_None
5351};
5352
5353/// A helper class for Type nodes having an ElaboratedTypeKeyword.
5354/// The keyword in stored in the free bits of the base class.
5355/// Also provides a few static helpers for converting and printing
5356/// elaborated type keyword and tag type kind enumerations.
5357class TypeWithKeyword : public Type {
5358protected:
5359 TypeWithKeyword(ElaboratedTypeKeyword Keyword, TypeClass tc,
5360 QualType Canonical, TypeDependence Dependence)
5361 : Type(tc, Canonical, Dependence) {
5362 TypeWithKeywordBits.Keyword = Keyword;
5363 }
5364
5365public:
5366 ElaboratedTypeKeyword getKeyword() const {
5367 return static_cast<ElaboratedTypeKeyword>(TypeWithKeywordBits.Keyword);
5368 }
5369
5370 /// Converts a type specifier (DeclSpec::TST) into an elaborated type keyword.
5371 static ElaboratedTypeKeyword getKeywordForTypeSpec(unsigned TypeSpec);
5372
5373 /// Converts a type specifier (DeclSpec::TST) into a tag type kind.
5374 /// It is an error to provide a type specifier which *isn't* a tag kind here.
5375 static TagTypeKind getTagTypeKindForTypeSpec(unsigned TypeSpec);
5376
5377 /// Converts a TagTypeKind into an elaborated type keyword.
5378 static ElaboratedTypeKeyword getKeywordForTagTypeKind(TagTypeKind Tag);
5379
5380 /// Converts an elaborated type keyword into a TagTypeKind.
5381 /// It is an error to provide an elaborated type keyword
5382 /// which *isn't* a tag kind here.
5383 static TagTypeKind getTagTypeKindForKeyword(ElaboratedTypeKeyword Keyword);
5384
5385 static bool KeywordIsTagTypeKind(ElaboratedTypeKeyword Keyword);
5386
5387 static StringRef getKeywordName(ElaboratedTypeKeyword Keyword);
5388
5389 static StringRef getTagTypeKindName(TagTypeKind Kind) {
5390 return getKeywordName(getKeywordForTagTypeKind(Kind));
5391 }
5392
5393 class CannotCastToThisType {};
5394 static CannotCastToThisType classof(const Type *);
5395};
5396
5397/// Represents a type that was referred to using an elaborated type
5398/// keyword, e.g., struct S, or via a qualified name, e.g., N::M::type,
5399/// or both.
5400///
5401/// This type is used to keep track of a type name as written in the
5402/// source code, including tag keywords and any nested-name-specifiers.
5403/// The type itself is always "sugar", used to express what was written
5404/// in the source code but containing no additional semantic information.
5405class ElaboratedType final
5406 : public TypeWithKeyword,
5407 public llvm::FoldingSetNode,
5408 private llvm::TrailingObjects<ElaboratedType, TagDecl *> {
5409 friend class ASTContext; // ASTContext creates these
5410 friend TrailingObjects;
5411
5412 /// The nested name specifier containing the qualifier.
5413 NestedNameSpecifier *NNS;
5414
5415 /// The type that this qualified name refers to.
5416 QualType NamedType;
5417
5418 /// The (re)declaration of this tag type owned by this occurrence is stored
5419 /// as a trailing object if there is one. Use getOwnedTagDecl to obtain
5420 /// it, or obtain a null pointer if there is none.
5421
5422 ElaboratedType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS,
5423 QualType NamedType, QualType CanonType, TagDecl *OwnedTagDecl)
5424 : TypeWithKeyword(Keyword, Elaborated, CanonType,
5425 // Any semantic dependence on the qualifier will have
5426 // been incorporated into NamedType. We still need to
5427 // track syntactic (instantiation / error / pack)
5428 // dependence on the qualifier.
5429 NamedType->getDependence() |
5430 (NNS ? toSyntacticDependence(
5431 toTypeDependence(NNS->getDependence()))
5432 : TypeDependence::None)),
5433 NNS(NNS), NamedType(NamedType) {
5434 ElaboratedTypeBits.HasOwnedTagDecl = false;
5435 if (OwnedTagDecl) {
5436 ElaboratedTypeBits.HasOwnedTagDecl = true;
5437 *getTrailingObjects<TagDecl *>() = OwnedTagDecl;
5438 }
5439 assert(!(Keyword == ETK_None && NNS == nullptr) &&((void)0)
5440 "ElaboratedType cannot have elaborated type keyword "((void)0)
5441 "and name qualifier both null.")((void)0);
5442 }
5443
5444public:
5445 /// Retrieve the qualification on this type.
5446 NestedNameSpecifier *getQualifier() const { return NNS; }
5447
5448 /// Retrieve the type named by the qualified-id.
5449 QualType getNamedType() const { return NamedType; }
5450
5451 /// Remove a single level of sugar.
5452 QualType desugar() const { return getNamedType(); }
5453
5454 /// Returns whether this type directly provides sugar.
5455 bool isSugared() const { return true; }
5456
5457 /// Return the (re)declaration of this type owned by this occurrence of this
5458 /// type, or nullptr if there is none.
5459 TagDecl *getOwnedTagDecl() const {
5460 return ElaboratedTypeBits.HasOwnedTagDecl ? *getTrailingObjects<TagDecl *>()
5461 : nullptr;
5462 }
5463
5464 void Profile(llvm::FoldingSetNodeID &ID) {
5465 Profile(ID, getKeyword(), NNS, NamedType, getOwnedTagDecl());
5466 }
5467
5468 static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword,
5469 NestedNameSpecifier *NNS, QualType NamedType,
5470 TagDecl *OwnedTagDecl) {
5471 ID.AddInteger(Keyword);
5472 ID.AddPointer(NNS);
5473 NamedType.Profile(ID);
5474 ID.AddPointer(OwnedTagDecl);
5475 }
5476
5477 static bool classof(const Type *T) { return T->getTypeClass() == Elaborated; }
5478};
5479
5480/// Represents a qualified type name for which the type name is
5481/// dependent.
5482///
5483/// DependentNameType represents a class of dependent types that involve a
5484/// possibly dependent nested-name-specifier (e.g., "T::") followed by a
5485/// name of a type. The DependentNameType may start with a "typename" (for a
5486/// typename-specifier), "class", "struct", "union", or "enum" (for a
5487/// dependent elaborated-type-specifier), or nothing (in contexts where we
5488/// know that we must be referring to a type, e.g., in a base class specifier).
5489/// Typically the nested-name-specifier is dependent, but in MSVC compatibility
5490/// mode, this type is used with non-dependent names to delay name lookup until
5491/// instantiation.
5492class DependentNameType : public TypeWithKeyword, public llvm::FoldingSetNode {
5493 friend class ASTContext; // ASTContext creates these
5494
5495 /// The nested name specifier containing the qualifier.
5496 NestedNameSpecifier *NNS;
5497
5498 /// The type that this typename specifier refers to.
5499 const IdentifierInfo *Name;
5500
5501 DependentNameType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS,
5502 const IdentifierInfo *Name, QualType CanonType)
5503 : TypeWithKeyword(Keyword, DependentName, CanonType,
5504 TypeDependence::DependentInstantiation |
5505 toTypeDependence(NNS->getDependence())),
5506 NNS(NNS), Name(Name) {}
5507
5508public:
5509 /// Retrieve the qualification on this type.
5510 NestedNameSpecifier *getQualifier() const { return NNS; }
5511
5512 /// Retrieve the type named by the typename specifier as an identifier.
5513 ///
5514 /// This routine will return a non-NULL identifier pointer when the
5515 /// form of the original typename was terminated by an identifier,
5516 /// e.g., "typename T::type".
5517 const IdentifierInfo *getIdentifier() const {
5518 return Name;
5519 }
5520
5521 bool isSugared() const { return false; }
5522 QualType desugar() const { return QualType(this, 0); }
5523
5524 void Profile(llvm::FoldingSetNodeID &ID) {
5525 Profile(ID, getKeyword(), NNS, Name);
5526 }
5527
5528 static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword,
5529 NestedNameSpecifier *NNS, const IdentifierInfo *Name) {
5530 ID.AddInteger(Keyword);
5531 ID.AddPointer(NNS);
5532 ID.AddPointer(Name);
5533 }
5534
5535 static bool classof(const Type *T) {
5536 return T->getTypeClass() == DependentName;
5537 }
5538};
5539
5540/// Represents a template specialization type whose template cannot be
5541/// resolved, e.g.
5542/// A<T>::template B<T>
5543class alignas(8) DependentTemplateSpecializationType
5544 : public TypeWithKeyword,
5545 public llvm::FoldingSetNode {
5546 friend class ASTContext; // ASTContext creates these
5547
5548 /// The nested name specifier containing the qualifier.
5549 NestedNameSpecifier *NNS;
5550
5551 /// The identifier of the template.
5552 const IdentifierInfo *Name;
5553
5554 DependentTemplateSpecializationType(ElaboratedTypeKeyword Keyword,
5555 NestedNameSpecifier *NNS,
5556 const IdentifierInfo *Name,
5557 ArrayRef<TemplateArgument> Args,
5558 QualType Canon);
5559
5560 const TemplateArgument *getArgBuffer() const {
5561 return reinterpret_cast<const TemplateArgument*>(this+1);
5562 }
5563
5564 TemplateArgument *getArgBuffer() {
5565 return reinterpret_cast<TemplateArgument*>(this+1);
5566 }
5567
5568public:
5569 NestedNameSpecifier *getQualifier() const { return NNS; }
5570 const IdentifierInfo *getIdentifier() const { return Name; }
5571
5572 /// Retrieve the template arguments.
5573 const TemplateArgument *getArgs() const {
5574 return getArgBuffer();
5575 }
5576
5577 /// Retrieve the number of template arguments.
5578 unsigned getNumArgs() const {
5579 return DependentTemplateSpecializationTypeBits.NumArgs;
5580 }
5581
5582 const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h
5583
5584 ArrayRef<TemplateArgument> template_arguments() const {
5585 return {getArgs(), getNumArgs()};
5586 }
5587
5588 using iterator = const TemplateArgument *;
5589
5590 iterator begin() const { return getArgs(); }
5591 iterator end() const; // inline in TemplateBase.h
5592
5593 bool isSugared() const { return false; }
5594 QualType desugar() const { return QualType(this, 0); }
5595
5596 void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context) {
5597 Profile(ID, Context, getKeyword(), NNS, Name, {getArgs(), getNumArgs()});
5598 }
5599
5600 static void Profile(llvm::FoldingSetNodeID &ID,
5601 const ASTContext &Context,
5602 ElaboratedTypeKeyword Keyword,
5603 NestedNameSpecifier *Qualifier,
5604 const IdentifierInfo *Name,
5605 ArrayRef<TemplateArgument> Args);
5606
5607 static bool classof(const Type *T) {
5608 return T->getTypeClass() == DependentTemplateSpecialization;
5609 }
5610};
5611
5612/// Represents a pack expansion of types.
5613///
5614/// Pack expansions are part of C++11 variadic templates. A pack
5615/// expansion contains a pattern, which itself contains one or more
5616/// "unexpanded" parameter packs. When instantiated, a pack expansion
5617/// produces a series of types, each instantiated from the pattern of
5618/// the expansion, where the Ith instantiation of the pattern uses the
5619/// Ith arguments bound to each of the unexpanded parameter packs. The
5620/// pack expansion is considered to "expand" these unexpanded
5621/// parameter packs.
5622///
5623/// \code
5624/// template<typename ...Types> struct tuple;
5625///
5626/// template<typename ...Types>
5627/// struct tuple_of_references {
5628/// typedef tuple<Types&...> type;
5629/// };
5630/// \endcode
5631///
5632/// Here, the pack expansion \c Types&... is represented via a
5633/// PackExpansionType whose pattern is Types&.
5634class PackExpansionType : public Type, public llvm::FoldingSetNode {
5635 friend class ASTContext; // ASTContext creates these
5636
5637 /// The pattern of the pack expansion.
5638 QualType Pattern;
5639
5640 PackExpansionType(QualType Pattern, QualType Canon,
5641 Optional<unsigned> NumExpansions)
5642 : Type(PackExpansion, Canon,
5643 (Pattern->getDependence() | TypeDependence::Dependent |
5644 TypeDependence::Instantiation) &
5645 ~TypeDependence::UnexpandedPack),
5646 Pattern(Pattern) {
5647 PackExpansionTypeBits.NumExpansions =
5648 NumExpansions ? *NumExpansions + 1 : 0;
5649 }
5650
5651public:
5652 /// Retrieve the pattern of this pack expansion, which is the
5653 /// type that will be repeatedly instantiated when instantiating the
5654 /// pack expansion itself.
5655 QualType getPattern() const { return Pattern; }
5656
5657 /// Retrieve the number of expansions that this pack expansion will
5658 /// generate, if known.
5659 Optional<unsigned> getNumExpansions() const {
5660 if (PackExpansionTypeBits.NumExpansions)
5661 return PackExpansionTypeBits.NumExpansions - 1;
5662 return None;
5663 }
5664
5665 bool isSugared() const { return false; }
5666 QualType desugar() const { return QualType(this, 0); }
5667
5668 void Profile(llvm::FoldingSetNodeID &ID) {
5669 Profile(ID, getPattern(), getNumExpansions());
5670 }
5671
5672 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pattern,
5673 Optional<unsigned> NumExpansions) {
5674 ID.AddPointer(Pattern.getAsOpaquePtr());
5675 ID.AddBoolean(NumExpansions.hasValue());
5676 if (NumExpansions)
5677 ID.AddInteger(*NumExpansions);
5678 }
5679
5680 static bool classof(const Type *T) {
5681 return T->getTypeClass() == PackExpansion;
5682 }
5683};
5684
5685/// This class wraps the list of protocol qualifiers. For types that can
5686/// take ObjC protocol qualifers, they can subclass this class.
5687template <class T>
5688class ObjCProtocolQualifiers {
5689protected:
5690 ObjCProtocolQualifiers() = default;
5691
5692 ObjCProtocolDecl * const *getProtocolStorage() const {
5693 return const_cast<ObjCProtocolQualifiers*>(this)->getProtocolStorage();
5694 }
5695
5696 ObjCProtocolDecl **getProtocolStorage() {
5697 return static_cast<T*>(this)->getProtocolStorageImpl();
5698 }
5699
5700 void setNumProtocols(unsigned N) {
5701 static_cast<T*>(this)->setNumProtocolsImpl(N);
5702 }
5703
5704 void initialize(ArrayRef<ObjCProtocolDecl *> protocols) {
5705 setNumProtocols(protocols.size());
5706 assert(getNumProtocols() == protocols.size() &&((void)0)
5707 "bitfield overflow in protocol count")((void)0);
5708 if (!protocols.empty())
5709 memcpy(getProtocolStorage(), protocols.data(),
5710 protocols.size() * sizeof(ObjCProtocolDecl*));
5711 }
5712
5713public:
5714 using qual_iterator = ObjCProtocolDecl * const *;
5715 using qual_range = llvm::iterator_range<qual_iterator>;
5716
5717 qual_range quals() const { return qual_range(qual_begin(), qual_end()); }
5718 qual_iterator qual_begin() const { return getProtocolStorage(); }
5719 qual_iterator qual_end() const { return qual_begin() + getNumProtocols(); }
5720
5721 bool qual_empty() const { return getNumProtocols() == 0; }
5722
5723 /// Return the number of qualifying protocols in this type, or 0 if
5724 /// there are none.
5725 unsigned getNumProtocols() const {
5726 return static_cast<const T*>(this)->getNumProtocolsImpl();
5727 }
5728
5729 /// Fetch a protocol by index.
5730 ObjCProtocolDecl *getProtocol(unsigned I) const {
5731 assert(I < getNumProtocols() && "Out-of-range protocol access")((void)0);
5732 return qual_begin()[I];
5733 }
5734
5735 /// Retrieve all of the protocol qualifiers.
5736 ArrayRef<ObjCProtocolDecl *> getProtocols() const {
5737 return ArrayRef<ObjCProtocolDecl *>(qual_begin(), getNumProtocols());
5738 }
5739};
5740
5741/// Represents a type parameter type in Objective C. It can take
5742/// a list of protocols.
5743class ObjCTypeParamType : public Type,
5744 public ObjCProtocolQualifiers<ObjCTypeParamType>,
5745 public llvm::FoldingSetNode {
5746 friend class ASTContext;
5747 friend class ObjCProtocolQualifiers<ObjCTypeParamType>;
5748
5749 /// The number of protocols stored on this type.
5750 unsigned NumProtocols : 6;
5751
5752 ObjCTypeParamDecl *OTPDecl;
5753
5754 /// The protocols are stored after the ObjCTypeParamType node. In the
5755 /// canonical type, the list of protocols are sorted alphabetically
5756 /// and uniqued.
5757 ObjCProtocolDecl **getProtocolStorageImpl();
5758
5759 /// Return the number of qualifying protocols in this interface type,
5760 /// or 0 if there are none.
5761 unsigned getNumProtocolsImpl() const {
5762 return NumProtocols;
5763 }
5764
5765 void setNumProtocolsImpl(unsigned N) {
5766 NumProtocols = N;
5767 }
5768
5769 ObjCTypeParamType(const ObjCTypeParamDecl *D,
5770 QualType can,
5771 ArrayRef<ObjCProtocolDecl *> protocols);
5772
5773public:
5774 bool isSugared() const { return true; }
5775 QualType desugar() const { return getCanonicalTypeInternal(); }
5776
5777 static bool classof(const Type *T) {
5778 return T->getTypeClass() == ObjCTypeParam;
5779 }
5780
5781 void Profile(llvm::FoldingSetNodeID &ID);
5782 static void Profile(llvm::FoldingSetNodeID &ID,
5783 const ObjCTypeParamDecl *OTPDecl,
5784 QualType CanonicalType,
5785 ArrayRef<ObjCProtocolDecl *> protocols);
5786
5787 ObjCTypeParamDecl *getDecl() const { return OTPDecl; }
5788};
5789
5790/// Represents a class type in Objective C.
5791///
5792/// Every Objective C type is a combination of a base type, a set of
5793/// type arguments (optional, for parameterized classes) and a list of
5794/// protocols.
5795///
5796/// Given the following declarations:
5797/// \code
5798/// \@class C<T>;
5799/// \@protocol P;
5800/// \endcode
5801///
5802/// 'C' is an ObjCInterfaceType C. It is sugar for an ObjCObjectType
5803/// with base C and no protocols.
5804///
5805/// 'C<P>' is an unspecialized ObjCObjectType with base C and protocol list [P].
5806/// 'C<C*>' is a specialized ObjCObjectType with type arguments 'C*' and no
5807/// protocol list.
5808/// 'C<C*><P>' is a specialized ObjCObjectType with base C, type arguments 'C*',
5809/// and protocol list [P].
5810///
5811/// 'id' is a TypedefType which is sugar for an ObjCObjectPointerType whose
5812/// pointee is an ObjCObjectType with base BuiltinType::ObjCIdType
5813/// and no protocols.
5814///
5815/// 'id<P>' is an ObjCObjectPointerType whose pointee is an ObjCObjectType
5816/// with base BuiltinType::ObjCIdType and protocol list [P]. Eventually
5817/// this should get its own sugar class to better represent the source.
5818class ObjCObjectType : public Type,
5819 public ObjCProtocolQualifiers<ObjCObjectType> {
5820 friend class ObjCProtocolQualifiers<ObjCObjectType>;
5821
5822 // ObjCObjectType.NumTypeArgs - the number of type arguments stored
5823 // after the ObjCObjectPointerType node.
5824 // ObjCObjectType.NumProtocols - the number of protocols stored
5825 // after the type arguments of ObjCObjectPointerType node.
5826 //
5827 // These protocols are those written directly on the type. If
5828 // protocol qualifiers ever become additive, the iterators will need
5829 // to get kindof complicated.
5830 //
5831 // In the canonical object type, these are sorted alphabetically
5832 // and uniqued.
5833
5834 /// Either a BuiltinType or an InterfaceType or sugar for either.
5835 QualType BaseType;
5836
5837 /// Cached superclass type.
5838 mutable llvm::PointerIntPair<const ObjCObjectType *, 1, bool>
5839 CachedSuperClassType;
5840
5841 QualType *getTypeArgStorage();
5842 const QualType *getTypeArgStorage() const {
5843 return const_cast<ObjCObjectType *>(this)->getTypeArgStorage();
5844 }
5845
5846 ObjCProtocolDecl **getProtocolStorageImpl();
5847 /// Return the number of qualifying protocols in this interface type,
5848 /// or 0 if there are none.
5849 unsigned getNumProtocolsImpl() const {
5850 return ObjCObjectTypeBits.NumProtocols;
5851 }
5852 void setNumProtocolsImpl(unsigned N) {
5853 ObjCObjectTypeBits.NumProtocols = N;
5854 }
5855
5856protected:
5857 enum Nonce_ObjCInterface { Nonce_ObjCInterface };
5858
5859 ObjCObjectType(QualType Canonical, QualType Base,
5860 ArrayRef<QualType> typeArgs,
5861 ArrayRef<ObjCProtocolDecl *> protocols,
5862 bool isKindOf);
5863
5864 ObjCObjectType(enum Nonce_ObjCInterface)
5865 : Type(ObjCInterface, QualType(), TypeDependence::None),
5866 BaseType(QualType(this_(), 0)) {
5867 ObjCObjectTypeBits.NumProtocols = 0;
5868 ObjCObjectTypeBits.NumTypeArgs = 0;
5869 ObjCObjectTypeBits.IsKindOf = 0;
5870 }
5871
5872 void computeSuperClassTypeSlow() const;
5873
5874public:
5875 /// Gets the base type of this object type. This is always (possibly
5876 /// sugar for) one of:
5877 /// - the 'id' builtin type (as opposed to the 'id' type visible to the
5878 /// user, which is a typedef for an ObjCObjectPointerType)
5879 /// - the 'Class' builtin type (same caveat)
5880 /// - an ObjCObjectType (currently always an ObjCInterfaceType)
5881 QualType getBaseType() const { return BaseType; }
5882
5883 bool isObjCId() const {
5884 return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCId);
5885 }
5886
5887 bool isObjCClass() const {
5888 return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCClass);
5889 }
5890
5891 bool isObjCUnqualifiedId() const { return qual_empty() && isObjCId(); }
5892 bool isObjCUnqualifiedClass() const { return qual_empty() && isObjCClass(); }
5893 bool isObjCUnqualifiedIdOrClass() const {
5894 if (!qual_empty()) return false;
5895 if (const BuiltinType *T = getBaseType()->getAs<BuiltinType>())
5896 return T->getKind() == BuiltinType::ObjCId ||
5897 T->getKind() == BuiltinType::ObjCClass;
5898 return false;
5899 }
5900 bool isObjCQualifiedId() const { return !qual_empty() && isObjCId(); }
5901 bool isObjCQualifiedClass() const { return !qual_empty() && isObjCClass(); }
5902
5903 /// Gets the interface declaration for this object type, if the base type
5904 /// really is an interface.
5905 ObjCInterfaceDecl *getInterface() const;
5906
5907 /// Determine whether this object type is "specialized", meaning
5908 /// that it has type arguments.
5909 bool isSpecialized() const;
5910
5911 /// Determine whether this object type was written with type arguments.
5912 bool isSpecializedAsWritten() const {
5913 return ObjCObjectTypeBits.NumTypeArgs > 0;
5914 }
5915
5916 /// Determine whether this object type is "unspecialized", meaning
5917 /// that it has no type arguments.
5918 bool isUnspecialized() const { return !isSpecialized(); }
5919
5920 /// Determine whether this object type is "unspecialized" as
5921 /// written, meaning that it has no type arguments.
5922 bool isUnspecializedAsWritten() const { return !isSpecializedAsWritten(); }
5923
5924 /// Retrieve the type arguments of this object type (semantically).
5925 ArrayRef<QualType> getTypeArgs() const;
5926
5927 /// Retrieve the type arguments of this object type as they were
5928 /// written.
5929 ArrayRef<QualType> getTypeArgsAsWritten() const {
5930 return llvm::makeArrayRef(getTypeArgStorage(),
5931 ObjCObjectTypeBits.NumTypeArgs);
5932 }
5933
5934 /// Whether this is a "__kindof" type as written.
5935 bool isKindOfTypeAsWritten() const { return ObjCObjectTypeBits.IsKindOf; }
5936
5937 /// Whether this ia a "__kindof" type (semantically).
5938 bool isKindOfType() const;
5939
5940 /// Retrieve the type of the superclass of this object type.
5941 ///
5942 /// This operation substitutes any type arguments into the
5943 /// superclass of the current class type, potentially producing a
5944 /// specialization of the superclass type. Produces a null type if
5945 /// there is no superclass.
5946 QualType getSuperClassType() const {
5947 if (!CachedSuperClassType.getInt())
5948 computeSuperClassTypeSlow();
5949
5950 assert(CachedSuperClassType.getInt() && "Superclass not set?")((void)0);
5951 return QualType(CachedSuperClassType.getPointer(), 0);
5952 }
5953
5954 /// Strip off the Objective-C "kindof" type and (with it) any
5955 /// protocol qualifiers.
5956 QualType stripObjCKindOfTypeAndQuals(const ASTContext &ctx) const;
5957
5958 bool isSugared() const { return false; }
5959 QualType desugar() const { return QualType(this, 0); }
5960
5961 static bool classof(const Type *T) {
5962 return T->getTypeClass() == ObjCObject ||
5963 T->getTypeClass() == ObjCInterface;
5964 }
5965};
5966
5967/// A class providing a concrete implementation
5968/// of ObjCObjectType, so as to not increase the footprint of
5969/// ObjCInterfaceType. Code outside of ASTContext and the core type
5970/// system should not reference this type.
5971class ObjCObjectTypeImpl : public ObjCObjectType, public llvm::FoldingSetNode {
5972 friend class ASTContext;
5973
5974 // If anyone adds fields here, ObjCObjectType::getProtocolStorage()
5975 // will need to be modified.
5976
5977 ObjCObjectTypeImpl(QualType Canonical, QualType Base,
5978 ArrayRef<QualType> typeArgs,
5979 ArrayRef<ObjCProtocolDecl *> protocols,
5980 bool isKindOf)
5981 : ObjCObjectType(Canonical, Base, typeArgs, protocols, isKindOf) {}
5982
5983public:
5984 void Profile(llvm::FoldingSetNodeID &ID);
5985 static void Profile(llvm::FoldingSetNodeID &ID,
5986 QualType Base,
5987 ArrayRef<QualType> typeArgs,
5988 ArrayRef<ObjCProtocolDecl *> protocols,
5989 bool isKindOf);
5990};
5991
5992inline QualType *ObjCObjectType::getTypeArgStorage() {
5993 return reinterpret_cast<QualType *>(static_cast<ObjCObjectTypeImpl*>(this)+1);
5994}
5995
5996inline ObjCProtocolDecl **ObjCObjectType::getProtocolStorageImpl() {
5997 return reinterpret_cast<ObjCProtocolDecl**>(
5998 getTypeArgStorage() + ObjCObjectTypeBits.NumTypeArgs);
5999}
6000
6001inline ObjCProtocolDecl **ObjCTypeParamType::getProtocolStorageImpl() {
6002 return reinterpret_cast<ObjCProtocolDecl**>(
6003 static_cast<ObjCTypeParamType*>(this)+1);
6004}
6005
6006/// Interfaces are the core concept in Objective-C for object oriented design.
6007/// They basically correspond to C++ classes. There are two kinds of interface
6008/// types: normal interfaces like `NSString`, and qualified interfaces, which
6009/// are qualified with a protocol list like `NSString<NSCopyable, NSAmazing>`.
6010///
6011/// ObjCInterfaceType guarantees the following properties when considered
6012/// as a subtype of its superclass, ObjCObjectType:
6013/// - There are no protocol qualifiers. To reinforce this, code which
6014/// tries to invoke the protocol methods via an ObjCInterfaceType will
6015/// fail to compile.
6016/// - It is its own base type. That is, if T is an ObjCInterfaceType*,
6017/// T->getBaseType() == QualType(T, 0).
6018class ObjCInterfaceType : public ObjCObjectType {
6019 friend class ASTContext; // ASTContext creates these.
6020 friend class ASTReader;
6021 friend class ObjCInterfaceDecl;
6022 template <class T> friend class serialization::AbstractTypeReader;
6023
6024 mutable ObjCInterfaceDecl *Decl;
6025
6026 ObjCInterfaceType(const ObjCInterfaceDecl *D)
6027 : ObjCObjectType(Nonce_ObjCInterface),
6028 Decl(const_cast<ObjCInterfaceDecl*>(D)) {}
6029
6030public:
6031 /// Get the declaration of this interface.
6032 ObjCInterfaceDecl *getDecl() const { return Decl; }
6033
6034 bool isSugared() const { return false; }
6035 QualType desugar() const { return QualType(this, 0); }
6036
6037 static bool classof(const Type *T) {
6038 return T->getTypeClass() == ObjCInterface;
6039 }
6040
6041 // Nonsense to "hide" certain members of ObjCObjectType within this
6042 // class. People asking for protocols on an ObjCInterfaceType are
6043 // not going to get what they want: ObjCInterfaceTypes are
6044 // guaranteed to have no protocols.
6045 enum {
6046 qual_iterator,
6047 qual_begin,
6048 qual_end,
6049 getNumProtocols,
6050 getProtocol
6051 };
6052};
6053
6054inline ObjCInterfaceDecl *ObjCObjectType::getInterface() const {
6055 QualType baseType = getBaseType();
6056 while (const auto *ObjT = baseType->getAs<ObjCObjectType>()) {
6057 if (const auto *T = dyn_cast<ObjCInterfaceType>(ObjT))
6058 return T->getDecl();
6059
6060 baseType = ObjT->getBaseType();
6061 }
6062
6063 return nullptr;
6064}
6065
6066/// Represents a pointer to an Objective C object.
6067///
6068/// These are constructed from pointer declarators when the pointee type is
6069/// an ObjCObjectType (or sugar for one). In addition, the 'id' and 'Class'
6070/// types are typedefs for these, and the protocol-qualified types 'id<P>'
6071/// and 'Class<P>' are translated into these.
6072///
6073/// Pointers to pointers to Objective C objects are still PointerTypes;
6074/// only the first level of pointer gets it own type implementation.
6075class ObjCObjectPointerType : public Type, public llvm::FoldingSetNode {
6076 friend class ASTContext; // ASTContext creates these.
6077
6078 QualType PointeeType;
6079
6080 ObjCObjectPointerType(QualType Canonical, QualType Pointee)
6081 : Type(ObjCObjectPointer, Canonical, Pointee->getDependence()),
6082 PointeeType(Pointee) {}
6083
6084public:
6085 /// Gets the type pointed to by this ObjC pointer.
6086 /// The result will always be an ObjCObjectType or sugar thereof.
6087 QualType getPointeeType() const { return PointeeType; }
6088
6089 /// Gets the type pointed to by this ObjC pointer. Always returns non-null.
6090 ///
6091 /// This method is equivalent to getPointeeType() except that
6092 /// it discards any typedefs (or other sugar) between this
6093 /// type and the "outermost" object type. So for:
6094 /// \code
6095 /// \@class A; \@protocol P; \@protocol Q;
6096 /// typedef A<P> AP;
6097 /// typedef A A1;
6098 /// typedef A1<P> A1P;
6099 /// typedef A1P<Q> A1PQ;
6100 /// \endcode
6101 /// For 'A*', getObjectType() will return 'A'.
6102 /// For 'A<P>*', getObjectType() will return 'A<P>'.
6103 /// For 'AP*', getObjectType() will return 'A<P>'.
6104 /// For 'A1*', getObjectType() will return 'A'.
6105 /// For 'A1<P>*', getObjectType() will return 'A1<P>'.
6106 /// For 'A1P*', getObjectType() will return 'A1<P>'.
6107 /// For 'A1PQ*', getObjectType() will return 'A1<Q>', because
6108 /// adding protocols to a protocol-qualified base discards the
6109 /// old qualifiers (for now). But if it didn't, getObjectType()
6110 /// would return 'A1P<Q>' (and we'd have to make iterating over
6111 /// qualifiers more complicated).
6112 const ObjCObjectType *getObjectType() const {
6113 return PointeeType->castAs<ObjCObjectType>();
6114 }
6115
6116 /// If this pointer points to an Objective C
6117 /// \@interface type, gets the type for that interface. Any protocol
6118 /// qualifiers on the interface are ignored.
6119 ///
6120 /// \return null if the base type for this pointer is 'id' or 'Class'
6121 const ObjCInterfaceType *getInterfaceType() const;
6122
6123 /// If this pointer points to an Objective \@interface
6124 /// type, gets the declaration for that interface.
6125 ///
6126 /// \return null if the base type for this pointer is 'id' or 'Class'
6127 ObjCInterfaceDecl *getInterfaceDecl() const {
6128 return getObjectType()->getInterface();
6129 }
6130
6131 /// True if this is equivalent to the 'id' type, i.e. if
6132 /// its object type is the primitive 'id' type with no protocols.
6133 bool isObjCIdType() const {
6134 return getObjectType()->isObjCUnqualifiedId();
6135 }
6136
6137 /// True if this is equivalent to the 'Class' type,
6138 /// i.e. if its object tive is the primitive 'Class' type with no protocols.
6139 bool isObjCClassType() const {
6140 return getObjectType()->isObjCUnqualifiedClass();
6141 }
6142
6143 /// True if this is equivalent to the 'id' or 'Class' type,
6144 bool isObjCIdOrClassType() const {
6145 return getObjectType()->isObjCUnqualifiedIdOrClass();
6146 }
6147
6148 /// True if this is equivalent to 'id<P>' for some non-empty set of
6149 /// protocols.
6150 bool isObjCQualifiedIdType() const {
6151 return getObjectType()->isObjCQualifiedId();
6152 }
6153
6154 /// True if this is equivalent to 'Class<P>' for some non-empty set of
6155 /// protocols.
6156 bool isObjCQualifiedClassType() const {
6157 return getObjectType()->isObjCQualifiedClass();
6158 }
6159
6160 /// Whether this is a "__kindof" type.
6161 bool isKindOfType() const { return getObjectType()->isKindOfType(); }
6162
6163 /// Whether this type is specialized, meaning that it has type arguments.
6164 bool isSpecialized() const { return getObjectType()->isSpecialized(); }
6165
6166 /// Whether this type is specialized, meaning that it has type arguments.
6167 bool isSpecializedAsWritten() const {
6168 return getObjectType()->isSpecializedAsWritten();
6169 }
6170
6171 /// Whether this type is unspecialized, meaning that is has no type arguments.
6172 bool isUnspecialized() const { return getObjectType()->isUnspecialized(); }
6173
6174 /// Determine whether this object type is "unspecialized" as
6175 /// written, meaning that it has no type arguments.
6176 bool isUnspecializedAsWritten() const { return !isSpecializedAsWritten(); }
6177
6178 /// Retrieve the type arguments for this type.
6179 ArrayRef<QualType> getTypeArgs() const {
6180 return getObjectType()->getTypeArgs();
6181 }
6182
6183 /// Retrieve the type arguments for this type.
6184 ArrayRef<QualType> getTypeArgsAsWritten() const {
6185 return getObjectType()->getTypeArgsAsWritten();
6186 }
6187
6188 /// An iterator over the qualifiers on the object type. Provided
6189 /// for convenience. This will always iterate over the full set of
6190 /// protocols on a type, not just those provided directly.
6191 using qual_iterator = ObjCObjectType::qual_iterator;
6192 using qual_range = llvm::iterator_range<qual_iterator>;
6193
6194 qual_range quals() const { return qual_range(qual_begin(), qual_end()); }
6195
6196 qual_iterator qual_begin() const {
6197 return getObjectType()->qual_begin();
6198 }
6199
6200 qual_iterator qual_end() const {
6201 return getObjectType()->qual_end();
6202 }
6203
6204 bool qual_empty() const { return getObjectType()->qual_empty(); }
6205
6206 /// Return the number of qualifying protocols on the object type.
6207 unsigned getNumProtocols() const {
6208 return getObjectType()->getNumProtocols();
6209 }
6210
6211 /// Retrieve a qualifying protocol by index on the object type.
6212 ObjCProtocolDecl *getProtocol(unsigned I) const {
6213 return getObjectType()->getProtocol(I);
6214 }
6215
6216 bool isSugared() const { return false; }
6217 QualType desugar() const { return QualType(this, 0); }
6218
6219 /// Retrieve the type of the superclass of this object pointer type.
6220 ///
6221 /// This operation substitutes any type arguments into the
6222 /// superclass of the current class type, potentially producing a
6223 /// pointer to a specialization of the superclass type. Produces a
6224 /// null type if there is no superclass.
6225 QualType getSuperClassType() const;
6226
6227 /// Strip off the Objective-C "kindof" type and (with it) any
6228 /// protocol qualifiers.
6229 const ObjCObjectPointerType *stripObjCKindOfTypeAndQuals(
6230 const ASTContext &ctx) const;
6231
6232 void Profile(llvm::FoldingSetNodeID &ID) {
6233 Profile(ID, getPointeeType());
6234 }
6235
6236 static void Profile(llvm::FoldingSetNodeID &ID, QualType T) {
6237 ID.AddPointer(T.getAsOpaquePtr());
6238 }
6239
6240 static bool classof(const Type *T) {
6241 return T->getTypeClass() == ObjCObjectPointer;
6242 }
6243};
6244
6245class AtomicType : public Type, public llvm::FoldingSetNode {
6246 friend class ASTContext; // ASTContext creates these.
6247
6248 QualType ValueType;
6249
6250 AtomicType(QualType ValTy, QualType Canonical)
6251 : Type(Atomic, Canonical, ValTy->getDependence()), ValueType(ValTy) {}
6252
6253public:
6254 /// Gets the type contained by this atomic type, i.e.
6255 /// the type returned by performing an atomic load of this atomic type.
6256 QualType getValueType() const { return ValueType; }
6257
6258 bool isSugared() const { return false; }
6259 QualType desugar() const { return QualType(this, 0); }
6260
6261 void Profile(llvm::FoldingSetNodeID &ID) {
6262 Profile(ID, getValueType());
6263 }
6264
6265 static void Profile(llvm::FoldingSetNodeID &ID, QualType T) {
6266 ID.AddPointer(T.getAsOpaquePtr());
6267 }
6268
6269 static bool classof(const Type *T) {
6270 return T->getTypeClass() == Atomic;
6271 }
6272};
6273
6274/// PipeType - OpenCL20.
6275class PipeType : public Type, public llvm::FoldingSetNode {
6276 friend class ASTContext; // ASTContext creates these.
6277
6278 QualType ElementType;
6279 bool isRead;
6280
6281 PipeType(QualType elemType, QualType CanonicalPtr, bool isRead)
6282 : Type(Pipe, CanonicalPtr, elemType->getDependence()),
6283 ElementType(elemType), isRead(isRead) {}
6284
6285public:
6286 QualType getElementType() const { return ElementType; }
6287
6288 bool isSugared() const { return false; }
6289
6290 QualType desugar() const { return QualType(this, 0); }
6291
6292 void Profile(llvm::FoldingSetNodeID &ID) {
6293 Profile(ID, getElementType(), isReadOnly());
6294 }
6295
6296 static void Profile(llvm::FoldingSetNodeID &ID, QualType T, bool isRead) {
6297 ID.AddPointer(T.getAsOpaquePtr());
6298 ID.AddBoolean(isRead);
6299 }
6300
6301 static bool classof(const Type *T) {
6302 return T->getTypeClass() == Pipe;
6303 }
6304
6305 bool isReadOnly() const { return isRead; }
6306};
6307
6308/// A fixed int type of a specified bitwidth.
6309class ExtIntType final : public Type, public llvm::FoldingSetNode {
6310 friend class ASTContext;
6311 unsigned IsUnsigned : 1;
6312 unsigned NumBits : 24;
6313
6314protected:
6315 ExtIntType(bool isUnsigned, unsigned NumBits);
6316
6317public:
6318 bool isUnsigned() const { return IsUnsigned; }
6319 bool isSigned() const { return !IsUnsigned; }
6320 unsigned getNumBits() const { return NumBits; }
6321
6322 bool isSugared() const { return false; }
6323 QualType desugar() const { return QualType(this, 0); }
6324
6325 void Profile(llvm::FoldingSetNodeID &ID) {
6326 Profile(ID, isUnsigned(), getNumBits());
6327 }
6328
6329 static void Profile(llvm::FoldingSetNodeID &ID, bool IsUnsigned,
6330 unsigned NumBits) {
6331 ID.AddBoolean(IsUnsigned);
6332 ID.AddInteger(NumBits);
6333 }
6334
6335 static bool classof(const Type *T) { return T->getTypeClass() == ExtInt; }
6336};
6337
6338class DependentExtIntType final : public Type, public llvm::FoldingSetNode {
6339 friend class ASTContext;
6340 const ASTContext &Context;
6341 llvm::PointerIntPair<Expr*, 1, bool> ExprAndUnsigned;
6342
6343protected:
6344 DependentExtIntType(const ASTContext &Context, bool IsUnsigned,
6345 Expr *NumBits);
6346
6347public:
6348 bool isUnsigned() const;
6349 bool isSigned() const { return !isUnsigned(); }
6350 Expr *getNumBitsExpr() const;
6351
6352 bool isSugared() const { return false; }
6353 QualType desugar() const { return QualType(this, 0); }
6354
6355 void Profile(llvm::FoldingSetNodeID &ID) {
6356 Profile(ID, Context, isUnsigned(), getNumBitsExpr());
6357 }
6358 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
6359 bool IsUnsigned, Expr *NumBitsExpr);
6360
6361 static bool classof(const Type *T) {
6362 return T->getTypeClass() == DependentExtInt;
6363 }
6364};
6365
6366/// A qualifier set is used to build a set of qualifiers.
6367class QualifierCollector : public Qualifiers {
6368public:
6369 QualifierCollector(Qualifiers Qs = Qualifiers()) : Qualifiers(Qs) {}
6370
6371 /// Collect any qualifiers on the given type and return an
6372 /// unqualified type. The qualifiers are assumed to be consistent
6373 /// with those already in the type.
6374 const Type *strip(QualType type) {
6375 addFastQualifiers(type.getLocalFastQualifiers());
6376 if (!type.hasLocalNonFastQualifiers())
6377 return type.getTypePtrUnsafe();
6378
6379 const ExtQuals *extQuals = type.getExtQualsUnsafe();
6380 addConsistentQualifiers(extQuals->getQualifiers());
6381 return extQuals->getBaseType();
6382 }
6383
6384 /// Apply the collected qualifiers to the given type.
6385 QualType apply(const ASTContext &Context, QualType QT) const;
6386
6387 /// Apply the collected qualifiers to the given type.
6388 QualType apply(const ASTContext &Context, const Type* T) const;
6389};
6390
6391/// A container of type source information.
6392///
6393/// A client can read the relevant info using TypeLoc wrappers, e.g:
6394/// @code
6395/// TypeLoc TL = TypeSourceInfo->getTypeLoc();
6396/// TL.getBeginLoc().print(OS, SrcMgr);
6397/// @endcode
6398class alignas(8) TypeSourceInfo {
6399 // Contains a memory block after the class, used for type source information,
6400 // allocated by ASTContext.
6401 friend class ASTContext;
6402
6403 QualType Ty;
6404
6405 TypeSourceInfo(QualType ty) : Ty(ty) {}
6406
6407public:
6408 /// Return the type wrapped by this type source info.
6409 QualType getType() const { return Ty; }
6410
6411 /// Return the TypeLoc wrapper for the type source info.
6412 TypeLoc getTypeLoc() const; // implemented in TypeLoc.h
6413
6414 /// Override the type stored in this TypeSourceInfo. Use with caution!
6415 void overrideType(QualType T) { Ty = T; }
6416};
6417
6418// Inline function definitions.
6419
6420inline SplitQualType SplitQualType::getSingleStepDesugaredType() const {
6421 SplitQualType desugar =
6422 Ty->getLocallyUnqualifiedSingleStepDesugaredType().split();
6423 desugar.Quals.addConsistentQualifiers(Quals);
6424 return desugar;
6425}
6426
6427inline const Type *QualType::getTypePtr() const {
6428 return getCommonPtr()->BaseType;
6429}
6430
6431inline const Type *QualType::getTypePtrOrNull() const {
6432 return (isNull() ? nullptr : getCommonPtr()->BaseType);
6433}
6434
6435inline SplitQualType QualType::split() const {
6436 if (!hasLocalNonFastQualifiers())
6437 return SplitQualType(getTypePtrUnsafe(),
6438 Qualifiers::fromFastMask(getLocalFastQualifiers()));
6439
6440 const ExtQuals *eq = getExtQualsUnsafe();
6441 Qualifiers qs = eq->getQualifiers();
6442 qs.addFastQualifiers(getLocalFastQualifiers());
6443 return SplitQualType(eq->getBaseType(), qs);
6444}
6445
6446inline Qualifiers QualType::getLocalQualifiers() const {
6447 Qualifiers Quals;
6448 if (hasLocalNonFastQualifiers())
6449 Quals = getExtQualsUnsafe()->getQualifiers();
6450 Quals.addFastQualifiers(getLocalFastQualifiers());
6451 return Quals;
6452}
6453
6454inline Qualifiers QualType::getQualifiers() const {
6455 Qualifiers quals = getCommonPtr()->CanonicalType.getLocalQualifiers();
6456 quals.addFastQualifiers(getLocalFastQualifiers());
6457 return quals;
6458}
6459
6460inline unsigned QualType::getCVRQualifiers() const {
6461 unsigned cvr = getCommonPtr()->CanonicalType.getLocalCVRQualifiers();
6462 cvr |= getLocalCVRQualifiers();
6463 return cvr;
6464}
6465
6466inline QualType QualType::getCanonicalType() const {
6467 QualType canon = getCommonPtr()->CanonicalType;
6468 return canon.withFastQualifiers(getLocalFastQualifiers());
6469}
6470
6471inline bool QualType::isCanonical() const {
6472 return getTypePtr()->isCanonicalUnqualified();
6473}
6474
6475inline bool QualType::isCanonicalAsParam() const {
6476 if (!isCanonical()) return false;
6477 if (hasLocalQualifiers()) return false;
6478
6479 const Type *T = getTypePtr();
6480 if (T->isVariablyModifiedType() && T->hasSizedVLAType())
6481 return false;
6482
6483 return !isa<FunctionType>(T) && !isa<ArrayType>(T);
6484}
6485
6486inline bool QualType::isConstQualified() const {
6487 return isLocalConstQualified() ||
6488 getCommonPtr()->CanonicalType.isLocalConstQualified();
6489}
6490
6491inline bool QualType::isRestrictQualified() const {
6492 return isLocalRestrictQualified() ||
6493 getCommonPtr()->CanonicalType.isLocalRestrictQualified();
6494}
6495
6496
6497inline bool QualType::isVolatileQualified() const {
6498 return isLocalVolatileQualified() ||
6499 getCommonPtr()->CanonicalType.isLocalVolatileQualified();
6500}
6501
6502inline bool QualType::hasQualifiers() const {
6503 return hasLocalQualifiers() ||
6504 getCommonPtr()->CanonicalType.hasLocalQualifiers();
6505}
6506
6507inline QualType QualType::getUnqualifiedType() const {
6508 if (!getTypePtr()->getCanonicalTypeInternal().hasLocalQualifiers())
6509 return QualType(getTypePtr(), 0);
6510
6511 return QualType(getSplitUnqualifiedTypeImpl(*this).Ty, 0);
6512}
6513
6514inline SplitQualType QualType::getSplitUnqualifiedType() const {
6515 if (!getTypePtr()->getCanonicalTypeInternal().hasLocalQualifiers())
6516 return split();
6517
6518 return getSplitUnqualifiedTypeImpl(*this);
6519}
6520
6521inline void QualType::removeLocalConst() {
6522 removeLocalFastQualifiers(Qualifiers::Const);
6523}
6524
6525inline void QualType::removeLocalRestrict() {
6526 removeLocalFastQualifiers(Qualifiers::Restrict);
6527}
6528
6529inline void QualType::removeLocalVolatile() {
6530 removeLocalFastQualifiers(Qualifiers::Volatile);
6531}
6532
6533inline void QualType::removeLocalCVRQualifiers(unsigned Mask) {
6534 assert(!(Mask & ~Qualifiers::CVRMask) && "mask has non-CVR bits")((void)0);
6535 static_assert((int)Qualifiers::CVRMask == (int)Qualifiers::FastMask,
6536 "Fast bits differ from CVR bits!");
6537
6538 // Fast path: we don't need to touch the slow qualifiers.
6539 removeLocalFastQualifiers(Mask);
6540}
6541
6542/// Check if this type has any address space qualifier.
6543inline bool QualType::hasAddressSpace() const {
6544 return getQualifiers().hasAddressSpace();
6545}
6546
6547/// Return the address space of this type.
6548inline LangAS QualType::getAddressSpace() const {
6549 return getQualifiers().getAddressSpace();
6550}
6551
6552/// Return the gc attribute of this type.
6553inline Qualifiers::GC QualType::getObjCGCAttr() const {
6554 return getQualifiers().getObjCGCAttr();
6555}
6556
6557inline bool QualType::hasNonTrivialToPrimitiveDefaultInitializeCUnion() const {
6558 if (auto *RD = getTypePtr()->getBaseElementTypeUnsafe()->getAsRecordDecl())
6559 return hasNonTrivialToPrimitiveDefaultInitializeCUnion(RD);
6560 return false;
6561}
6562
6563inline bool QualType::hasNonTrivialToPrimitiveDestructCUnion() const {
6564 if (auto *RD = getTypePtr()->getBaseElementTypeUnsafe()->getAsRecordDecl())
6565 return hasNonTrivialToPrimitiveDestructCUnion(RD);
6566 return false;
6567}
6568
6569inline bool QualType::hasNonTrivialToPrimitiveCopyCUnion() const {
6570 if (auto *RD = getTypePtr()->getBaseElementTypeUnsafe()->getAsRecordDecl())
6571 return hasNonTrivialToPrimitiveCopyCUnion(RD);
6572 return false;
6573}
6574
6575inline FunctionType::ExtInfo getFunctionExtInfo(const Type &t) {
6576 if (const auto *PT = t.getAs<PointerType>()) {
6577 if (const auto *FT = PT->getPointeeType()->getAs<FunctionType>())
6578 return FT->getExtInfo();
6579 } else if (const auto *FT = t.getAs<FunctionType>())
6580 return FT->getExtInfo();
6581
6582 return FunctionType::ExtInfo();
6583}
6584
6585inline FunctionType::ExtInfo getFunctionExtInfo(QualType t) {
6586 return getFunctionExtInfo(*t);
6587}
6588
6589/// Determine whether this type is more
6590/// qualified than the Other type. For example, "const volatile int"
6591/// is more qualified than "const int", "volatile int", and
6592/// "int". However, it is not more qualified than "const volatile
6593/// int".
6594inline bool QualType::isMoreQualifiedThan(QualType other) const {
6595 Qualifiers MyQuals = getQualifiers();
6596 Qualifiers OtherQuals = other.getQualifiers();
6597 return (MyQuals != OtherQuals && MyQuals.compatiblyIncludes(OtherQuals));
6598}
6599
6600/// Determine whether this type is at last
6601/// as qualified as the Other type. For example, "const volatile
6602/// int" is at least as qualified as "const int", "volatile int",
6603/// "int", and "const volatile int".
6604inline bool QualType::isAtLeastAsQualifiedAs(QualType other) const {
6605 Qualifiers OtherQuals = other.getQualifiers();
6606
6607 // Ignore __unaligned qualifier if this type is a void.
6608 if (getUnqualifiedType()->isVoidType())
6609 OtherQuals.removeUnaligned();
6610
6611 return getQualifiers().compatiblyIncludes(OtherQuals);
6612}
6613
6614/// If Type is a reference type (e.g., const
6615/// int&), returns the type that the reference refers to ("const
6616/// int"). Otherwise, returns the type itself. This routine is used
6617/// throughout Sema to implement C++ 5p6:
6618///
6619/// If an expression initially has the type "reference to T" (8.3.2,
6620/// 8.5.3), the type is adjusted to "T" prior to any further
6621/// analysis, the expression designates the object or function
6622/// denoted by the reference, and the expression is an lvalue.
6623inline QualType QualType::getNonReferenceType() const {
6624 if (const auto *RefType = (*this)->getAs<ReferenceType>())
6625 return RefType->getPointeeType();
6626 else
6627 return *this;
6628}
6629
6630inline bool QualType::isCForbiddenLValueType() const {
6631 return ((getTypePtr()->isVoidType() && !hasQualifiers()) ||
6632 getTypePtr()->isFunctionType());
6633}
6634
6635/// Tests whether the type is categorized as a fundamental type.
6636///
6637/// \returns True for types specified in C++0x [basic.fundamental].
6638inline bool Type::isFundamentalType() const {
6639 return isVoidType() ||
6640 isNullPtrType() ||
6641 // FIXME: It's really annoying that we don't have an
6642 // 'isArithmeticType()' which agrees with the standard definition.
6643 (isArithmeticType() && !isEnumeralType());
6644}
6645
6646/// Tests whether the type is categorized as a compound type.
6647///
6648/// \returns True for types specified in C++0x [basic.compound].
6649inline bool Type::isCompoundType() const {
6650 // C++0x [basic.compound]p1:
6651 // Compound types can be constructed in the following ways:
6652 // -- arrays of objects of a given type [...];
6653 return isArrayType() ||
6654 // -- functions, which have parameters of given types [...];
6655 isFunctionType() ||
6656 // -- pointers to void or objects or functions [...];
6657 isPointerType() ||
6658 // -- references to objects or functions of a given type. [...]
6659 isReferenceType() ||
6660 // -- classes containing a sequence of objects of various types, [...];
6661 isRecordType() ||
6662 // -- unions, which are classes capable of containing objects of different
6663 // types at different times;
6664 isUnionType() ||
6665 // -- enumerations, which comprise a set of named constant values. [...];
6666 isEnumeralType() ||
6667 // -- pointers to non-static class members, [...].
6668 isMemberPointerType();
6669}
6670
6671inline bool Type::isFunctionType() const {
6672 return isa<FunctionType>(CanonicalType);
6673}
6674
6675inline bool Type::isPointerType() const {
6676 return isa<PointerType>(CanonicalType);
6677}
6678
6679inline bool Type::isAnyPointerType() const {
6680 return isPointerType() || isObjCObjectPointerType();
6681}
6682
6683inline bool Type::isBlockPointerType() const {
6684 return isa<BlockPointerType>(CanonicalType);
6685}
6686
6687inline bool Type::isReferenceType() const {
6688 return isa<ReferenceType>(CanonicalType);
12
←
Assuming field 'CanonicalType' is not a 'ReferenceType'
→
13
←
Returning zero, which participates in a condition later
→
6689}
6690
6691inline bool Type::isLValueReferenceType() const {
6692 return isa<LValueReferenceType>(CanonicalType);
6693}
6694
6695inline bool Type::isRValueReferenceType() const {
6696 return isa<RValueReferenceType>(CanonicalType);
6697}
6698
6699inline bool Type::isObjectPointerType() const {
6700 // Note: an "object pointer type" is not the same thing as a pointer to an
6701 // object type; rather, it is a pointer to an object type or a pointer to cv
6702 // void.
6703 if (const auto *T = getAs<PointerType>())
6704 return !T->getPointeeType()->isFunctionType();
6705 else
6706 return false;
6707}
6708
6709inline bool Type::isFunctionPointerType() const {
6710 if (const auto *T = getAs<PointerType>())
6711 return T->getPointeeType()->isFunctionType();
6712 else
6713 return false;
6714}
6715
6716inline bool Type::isFunctionReferenceType() const {
6717 if (const auto *T = getAs<ReferenceType>())
6718 return T->getPointeeType()->isFunctionType();
6719 else
6720 return false;
6721}
6722
6723inline bool Type::isMemberPointerType() const {
6724 return isa<MemberPointerType>(CanonicalType);
6725}
6726
6727inline bool Type::isMemberFunctionPointerType() const {
6728 if (const auto *T = getAs<MemberPointerType>())
6729 return T->isMemberFunctionPointer();
6730 else
6731 return false;
6732}
6733
6734inline bool Type::isMemberDataPointerType() const {
6735 if (const auto *T = getAs<MemberPointerType>())
6736 return T->isMemberDataPointer();
6737 else
6738 return false;
6739}
6740
6741inline bool Type::isArrayType() const {
6742 return isa<ArrayType>(CanonicalType);
6743}
6744
6745inline bool Type::isConstantArrayType() const {
6746 return isa<ConstantArrayType>(CanonicalType);
6747}
6748
6749inline bool Type::isIncompleteArrayType() const {
6750 return isa<IncompleteArrayType>(CanonicalType);
6751}
6752
6753inline bool Type::isVariableArrayType() const {
6754 return isa<VariableArrayType>(CanonicalType);
6755}
6756
6757inline bool Type::isDependentSizedArrayType() const {
6758 return isa<DependentSizedArrayType>(CanonicalType);
6759}
6760
6761inline bool Type::isBuiltinType() const {
6762 return isa<BuiltinType>(CanonicalType);
6763}
6764
6765inline bool Type::isRecordType() const {
6766 return isa<RecordType>(CanonicalType);
6767}
6768
6769inline bool Type::isEnumeralType() const {
6770 return isa<EnumType>(CanonicalType);
6771}
6772
6773inline bool Type::isAnyComplexType() const {
6774 return isa<ComplexType>(CanonicalType);
6775}
6776
6777inline bool Type::isVectorType() const {
6778 return isa<VectorType>(CanonicalType);
6779}
6780
6781inline bool Type::isExtVectorType() const {
6782 return isa<ExtVectorType>(CanonicalType);
6783}
6784
6785inline bool Type::isMatrixType() const {
6786 return isa<MatrixType>(CanonicalType);
6787}
6788
6789inline bool Type::isConstantMatrixType() const {
6790 return isa<ConstantMatrixType>(CanonicalType);
6791}
6792
6793inline bool Type::isDependentAddressSpaceType() const {
6794 return isa<DependentAddressSpaceType>(CanonicalType);
6795}
6796
6797inline bool Type::isObjCObjectPointerType() const {
6798 return isa<ObjCObjectPointerType>(CanonicalType);
6799}
6800
6801inline bool Type::isObjCObjectType() const {
6802 return isa<ObjCObjectType>(CanonicalType);
6803}
6804
6805inline bool Type::isObjCObjectOrInterfaceType() const {
6806 return isa<ObjCInterfaceType>(CanonicalType) ||
6807 isa<ObjCObjectType>(CanonicalType);
6808}
6809
6810inline bool Type::isAtomicType() const {
6811 return isa<AtomicType>(CanonicalType);
6812}
6813
6814inline bool Type::isUndeducedAutoType() const {
6815 return isa<AutoType>(CanonicalType);
6816}
6817
6818inline bool Type::isObjCQualifiedIdType() const {
6819 if (const auto *OPT = getAs<ObjCObjectPointerType>())
6820 return OPT->isObjCQualifiedIdType();
6821 return false;
6822}
6823
6824inline bool Type::isObjCQualifiedClassType() const {
6825 if (const auto *OPT = getAs<ObjCObjectPointerType>())
6826 return OPT->isObjCQualifiedClassType();
6827 return false;
6828}
6829
6830inline bool Type::isObjCIdType() const {
6831 if (const auto *OPT = getAs<ObjCObjectPointerType>())
6832 return OPT->isObjCIdType();
6833 return false;
6834}
6835
6836inline bool Type::isObjCClassType() const {
6837 if (const auto *OPT = getAs<ObjCObjectPointerType>())
6838 return OPT->isObjCClassType();
6839 return false;
6840}
6841
6842inline bool Type::isObjCSelType() const {
6843 if (const auto *OPT = getAs<PointerType>())
6844 return OPT->getPointeeType()->isSpecificBuiltinType(BuiltinType::ObjCSel);
6845 return false;
6846}
6847
6848inline bool Type::isObjCBuiltinType() const {
6849 return isObjCIdType() || isObjCClassType() || isObjCSelType();
6850}
6851
6852inline bool Type::isDecltypeType() const {
6853 return isa<DecltypeType>(this);
6854}
6855
6856#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
6857 inline bool Type::is##Id##Type() const { \
6858 return isSpecificBuiltinType(BuiltinType::Id); \
6859 }
6860#include "clang/Basic/OpenCLImageTypes.def"
6861
6862inline bool Type::isSamplerT() const {
6863 return isSpecificBuiltinType(BuiltinType::OCLSampler);
26
←
Calling 'Type::isSpecificBuiltinType'
→
31
←
Returning from 'Type::isSpecificBuiltinType'
→
32
←
Returning the value 1, which participates in a condition later
→
6864}
6865
6866inline bool Type::isEventT() const {
6867 return isSpecificBuiltinType(BuiltinType::OCLEvent);
6868}
6869
6870inline bool Type::isClkEventT() const {
6871 return isSpecificBuiltinType(BuiltinType::OCLClkEvent);
6872}
6873
6874inline bool Type::isQueueT() const {
6875 return isSpecificBuiltinType(BuiltinType::OCLQueue);
6876}
6877
6878inline bool Type::isReserveIDT() const {
6879 return isSpecificBuiltinType(BuiltinType::OCLReserveID);
6880}
6881
6882inline bool Type::isImageType() const {
6883#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) is##Id##Type() ||
6884 return
6885#include "clang/Basic/OpenCLImageTypes.def"
6886 false; // end boolean or operation
6887}
6888
6889inline bool Type::isPipeType() const {
6890 return isa<PipeType>(CanonicalType);
6891}
6892
6893inline bool Type::isExtIntType() const {
6894 return isa<ExtIntType>(CanonicalType);
6895}
6896
6897#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
6898 inline bool Type::is##Id##Type() const { \
6899 return isSpecificBuiltinType(BuiltinType::Id); \
6900 }
6901#include "clang/Basic/OpenCLExtensionTypes.def"
6902
6903inline bool Type::isOCLIntelSubgroupAVCType() const {
6904#define INTEL_SUBGROUP_AVC_TYPE(ExtType, Id) \
6905 isOCLIntelSubgroupAVC##Id##Type() ||
6906 return
6907#include "clang/Basic/OpenCLExtensionTypes.def"
6908 false; // end of boolean or operation
6909}
6910
6911inline bool Type::isOCLExtOpaqueType() const {
6912#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) is##Id##Type() ||
6913 return
6914#include "clang/Basic/OpenCLExtensionTypes.def"
6915 false; // end of boolean or operation
6916}
6917
6918inline bool Type::isOpenCLSpecificType() const {
6919 return isSamplerT() || isEventT() || isImageType() || isClkEventT() ||
6920 isQueueT() || isReserveIDT() || isPipeType() || isOCLExtOpaqueType();
6921}
6922
6923inline bool Type::isTemplateTypeParmType() const {
6924 return isa<TemplateTypeParmType>(CanonicalType);
6925}
6926
6927inline bool Type::isSpecificBuiltinType(unsigned K) const {
6928 if (const BuiltinType *BT
27.1
'BT' is non-null
27.1
'BT' is non-null
 = getAs<BuiltinType>()) {
27
←
Assuming the object is a 'BuiltinType'
→
28
←
Taking true branch
→
6929 return BT->getKind() == static_cast<BuiltinType::Kind>(K);
29
←
Assuming the condition is true
→
30
←
Returning the value 1, which participates in a condition later
→
6930 }
6931 return false;
6932}
6933
6934inline bool Type::isPlaceholderType() const {
6935 if (const auto *BT = dyn_cast<BuiltinType>(this))
6936 return BT->isPlaceholderType();
6937 return false;
6938}
6939
6940inline const BuiltinType *Type::getAsPlaceholderType() const {
6941 if (const auto *BT = dyn_cast<BuiltinType>(this))
6942 if (BT->isPlaceholderType())
6943 return BT;
6944 return nullptr;
6945}
6946
6947inline bool Type::isSpecificPlaceholderType(unsigned K) const {
6948 assert(BuiltinType::isPlaceholderTypeKind((BuiltinType::Kind) K))((void)0);
6949 return isSpecificBuiltinType(K);
6950}
6951
6952inline bool Type::isNonOverloadPlaceholderType() const {
6953 if (const auto *BT = dyn_cast<BuiltinType>(this))
6954 return BT->isNonOverloadPlaceholderType();
6955 return false;
6956}
6957
6958inline bool Type::isVoidType() const {
6959 return isSpecificBuiltinType(BuiltinType::Void);
6960}
6961
6962inline bool Type::isHalfType() const {
6963 // FIXME: Should we allow complex __fp16? Probably not.
6964 return isSpecificBuiltinType(BuiltinType::Half);
6965}
6966
6967inline bool Type::isFloat16Type() const {
6968 return isSpecificBuiltinType(BuiltinType::Float16);
6969}
6970
6971inline bool Type::isBFloat16Type() const {
6972 return isSpecificBuiltinType(BuiltinType::BFloat16);
6973}
6974
6975inline bool Type::isFloat128Type() const {
6976 return isSpecificBuiltinType(BuiltinType::Float128);
6977}
6978
6979inline bool Type::isNullPtrType() const {
6980 return isSpecificBuiltinType(BuiltinType::NullPtr);
6981}
6982
6983bool IsEnumDeclComplete(EnumDecl *);
6984bool IsEnumDeclScoped(EnumDecl *);
6985
6986inline bool Type::isIntegerType() const {
6987 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
6988 return BT->getKind() >= BuiltinType::Bool &&
6989 BT->getKind() <= BuiltinType::Int128;
6990 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) {
6991 // Incomplete enum types are not treated as integer types.
6992 // FIXME: In C++, enum types are never integer types.
6993 return IsEnumDeclComplete(ET->getDecl()) &&
6994 !IsEnumDeclScoped(ET->getDecl());
6995 }
6996 return isExtIntType();
6997}
6998
6999inline bool Type::isFixedPointType() const {
7000 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType)) {
7001 return BT->getKind() >= BuiltinType::ShortAccum &&
7002 BT->getKind() <= BuiltinType::SatULongFract;
7003 }
7004 return false;
7005}
7006
7007inline bool Type::isFixedPointOrIntegerType() const {
7008 return isFixedPointType() || isIntegerType();
7009}
7010
7011inline bool Type::isSaturatedFixedPointType() const {
7012 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType)) {
7013 return BT->getKind() >= BuiltinType::SatShortAccum &&
7014 BT->getKind() <= BuiltinType::SatULongFract;
7015 }
7016 return false;
7017}
7018
7019inline bool Type::isUnsaturatedFixedPointType() const {
7020 return isFixedPointType() && !isSaturatedFixedPointType();
7021}
7022
7023inline bool Type::isSignedFixedPointType() const {
7024 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType)) {
7025 return ((BT->getKind() >= BuiltinType::ShortAccum &&
7026 BT->getKind() <= BuiltinType::LongAccum) ||
7027 (BT->getKind() >= BuiltinType::ShortFract &&
7028 BT->getKind() <= BuiltinType::LongFract) ||
7029 (BT->getKind() >= BuiltinType::SatShortAccum &&
7030 BT->getKind() <= BuiltinType::SatLongAccum) ||
7031 (BT->getKind() >= BuiltinType::SatShortFract &&
7032 BT->getKind() <= BuiltinType::SatLongFract));
7033 }
7034 return false;
7035}
7036
7037inline bool Type::isUnsignedFixedPointType() const {
7038 return isFixedPointType() && !isSignedFixedPointType();
7039}
7040
7041inline bool Type::isScalarType() const {
7042 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
7043 return BT->getKind() > BuiltinType::Void &&
7044 BT->getKind() <= BuiltinType::NullPtr;
7045 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType))
7046 // Enums are scalar types, but only if they are defined. Incomplete enums
7047 // are not treated as scalar types.
7048 return IsEnumDeclComplete(ET->getDecl());
7049 return isa<PointerType>(CanonicalType) ||
7050 isa<BlockPointerType>(CanonicalType) ||
7051 isa<MemberPointerType>(CanonicalType) ||
7052 isa<ComplexType>(CanonicalType) ||
7053 isa<ObjCObjectPointerType>(CanonicalType) ||
7054 isExtIntType();
7055}
7056
7057inline bool Type::isIntegralOrEnumerationType() const {
7058 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
7059 return BT->getKind() >= BuiltinType::Bool &&
7060 BT->getKind() <= BuiltinType::Int128;
7061
7062 // Check for a complete enum type; incomplete enum types are not properly an
7063 // enumeration type in the sense required here.
7064 if (const auto *ET = dyn_cast<EnumType>(CanonicalType))
7065 return IsEnumDeclComplete(ET->getDecl());
7066
7067 return isExtIntType();
7068}
7069
7070inline bool Type::isBooleanType() const {
7071 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
7072 return BT->getKind() == BuiltinType::Bool;
7073 return false;
7074}
7075
7076inline bool Type::isUndeducedType() const {
7077 auto *DT = getContainedDeducedType();
7078 return DT && !DT->isDeduced();
7079}
7080
7081/// Determines whether this is a type for which one can define
7082/// an overloaded operator.
7083inline bool Type::isOverloadableType() const {
7084 return isDependentType() || isRecordType() || isEnumeralType();
7085}
7086
7087/// Determines whether this type is written as a typedef-name.
7088inline bool Type::isTypedefNameType() const {
7089 if (getAs<TypedefType>())
7090 return true;
7091 if (auto *TST = getAs<TemplateSpecializationType>())
7092 return TST->isTypeAlias();
7093 return false;
7094}
7095
7096/// Determines whether this type can decay to a pointer type.
7097inline bool Type::canDecayToPointerType() const {
7098 return isFunctionType() || isArrayType();
7099}
7100
7101inline bool Type::hasPointerRepresentation() const {
7102 return (isPointerType() || isReferenceType() || isBlockPointerType() ||
7103 isObjCObjectPointerType() || isNullPtrType());
7104}
7105
7106inline bool Type::hasObjCPointerRepresentation() const {
7107 return isObjCObjectPointerType();
7108}
7109
7110inline const Type *Type::getBaseElementTypeUnsafe() const {
7111 const Type *type = this;
7112 while (const ArrayType *arrayType = type->getAsArrayTypeUnsafe())
7113 type = arrayType->getElementType().getTypePtr();
7114 return type;
7115}
7116
7117inline const Type *Type::getPointeeOrArrayElementType() const {
7118 const Type *type = this;
7119 if (type->isAnyPointerType())
7120 return type->getPointeeType().getTypePtr();
7121 else if (type->isArrayType())
7122 return type->getBaseElementTypeUnsafe();
7123 return type;
7124}
7125/// Insertion operator for partial diagnostics. This allows sending adress
7126/// spaces into a diagnostic with <<.
7127inline const StreamingDiagnostic &operator<<(const StreamingDiagnostic &PD,
7128 LangAS AS) {
7129 PD.AddTaggedVal(static_cast<std::underlying_type_t<LangAS>>(AS),
7130 DiagnosticsEngine::ArgumentKind::ak_addrspace);
7131 return PD;
7132}
7133
7134/// Insertion operator for partial diagnostics. This allows sending Qualifiers
7135/// into a diagnostic with <<.
7136inline const StreamingDiagnostic &operator<<(const StreamingDiagnostic &PD,
7137 Qualifiers Q) {
7138 PD.AddTaggedVal(Q.getAsOpaqueValue(),
7139 DiagnosticsEngine::ArgumentKind::ak_qual);
7140 return PD;
7141}
7142
7143/// Insertion operator for partial diagnostics. This allows sending QualType's
7144/// into a diagnostic with <<.
7145inline const StreamingDiagnostic &operator<<(const StreamingDiagnostic &PD,
7146 QualType T) {
7147 PD.AddTaggedVal(reinterpret_cast<intptr_t>(T.getAsOpaquePtr()),
7148 DiagnosticsEngine::ak_qualtype);
7149 return PD;
7150}
7151
7152// Helper class template that is used by Type::getAs to ensure that one does
7153// not try to look through a qualified type to get to an array type.
7154template <typename T>
7155using TypeIsArrayType =
7156 std::integral_constant<bool, std::is_same<T, ArrayType>::value ||
7157 std::is_base_of<ArrayType, T>::value>;
7158
7159// Member-template getAs<specific type>'.
7160template <typename T> const T *Type::getAs() const {
7161 static_assert(!TypeIsArrayType<T>::value,
7162 "ArrayType cannot be used with getAs!");
7163
7164 // If this is directly a T type, return it.
7165 if (const auto *Ty = dyn_cast<T>(this))
7166 return Ty;
7167
7168 // If the canonical form of this type isn't the right kind, reject it.
7169 if (!isa<T>(CanonicalType))
7170 return nullptr;
7171
7172 // If this is a typedef for the type, strip the typedef off without
7173 // losing all typedef information.
7174 return cast<T>(getUnqualifiedDesugaredType());
7175}
7176
7177template <typename T> const T *Type::getAsAdjusted() const {
7178 static_assert(!TypeIsArrayType<T>::value, "ArrayType cannot be used with getAsAdjusted!");
7179
7180 // If this is directly a T type, return it.
7181 if (const auto *Ty = dyn_cast<T>(this))
7182 return Ty;
7183
7184 // If the canonical form of this type isn't the right kind, reject it.
7185 if (!isa<T>(CanonicalType))
7186 return nullptr;
7187
7188 // Strip off type adjustments that do not modify the underlying nature of the
7189 // type.
7190 const Type *Ty = this;
7191 while (Ty) {
7192 if (const auto *A = dyn_cast<AttributedType>(Ty))
7193 Ty = A->getModifiedType().getTypePtr();
7194 else if (const auto *E = dyn_cast<ElaboratedType>(Ty))
7195 Ty = E->desugar().getTypePtr();
7196 else if (const auto *P = dyn_cast<ParenType>(Ty))
7197 Ty = P->desugar().getTypePtr();
7198 else if (const auto *A = dyn_cast<AdjustedType>(Ty))
7199 Ty = A->desugar().getTypePtr();
7200 else if (const auto *M = dyn_cast<MacroQualifiedType>(Ty))
7201 Ty = M->desugar().getTypePtr();
7202 else
7203 break;
7204 }
7205
7206 // Just because the canonical type is correct does not mean we can use cast<>,
7207 // since we may not have stripped off all the sugar down to the base type.
7208 return dyn_cast<T>(Ty);
7209}
7210
7211inline const ArrayType *Type::getAsArrayTypeUnsafe() const {
7212 // If this is directly an array type, return it.
7213 if (const auto *arr = dyn_cast<ArrayType>(this))
7214 return arr;
7215
7216 // If the canonical form of this type isn't the right kind, reject it.
7217 if (!isa<ArrayType>(CanonicalType))
7218 return nullptr;
7219
7220 // If this is a typedef for the type, strip the typedef off without
7221 // losing all typedef information.
7222 return cast<ArrayType>(getUnqualifiedDesugaredType());
7223}
7224
7225template <typename T> const T *Type::castAs() const {
7226 static_assert(!TypeIsArrayType<T>::value,
7227 "ArrayType cannot be used with castAs!");
7228
7229 if (const auto *ty = dyn_cast<T>(this)) return ty;
7230 assert(isa<T>(CanonicalType))((void)0);
7231 return cast<T>(getUnqualifiedDesugaredType());
7232}
7233
7234inline const ArrayType *Type::castAsArrayTypeUnsafe() const {
7235 assert(isa<ArrayType>(CanonicalType))((void)0);
7236 if (const auto *arr = dyn_cast<ArrayType>(this)) return arr;
7237 return cast<ArrayType>(getUnqualifiedDesugaredType());
7238}
7239
7240DecayedType::DecayedType(QualType OriginalType, QualType DecayedPtr,
7241 QualType CanonicalPtr)
7242 : AdjustedType(Decayed, OriginalType, DecayedPtr, CanonicalPtr) {
7243#ifndef NDEBUG1
7244 QualType Adjusted = getAdjustedType();
7245 (void)AttributedType::stripOuterNullability(Adjusted);
7246 assert(isa<PointerType>(Adjusted))((void)0);
7247#endif
7248}
7249
7250QualType DecayedType::getPointeeType() const {
7251 QualType Decayed = getDecayedType();
7252 (void)AttributedType::stripOuterNullability(Decayed);
7253 return cast<PointerType>(Decayed)->getPointeeType();
7254}
7255
7256// Get the decimal string representation of a fixed point type, represented
7257// as a scaled integer.
7258// TODO: At some point, we should change the arguments to instead just accept an
7259// APFixedPoint instead of APSInt and scale.
7260void FixedPointValueToString(SmallVectorImpl<char> &Str, llvm::APSInt Val,
7261 unsigned Scale);
7262
7263} // namespace clang
7264
7265#endif // LLVM_CLANG_AST_TYPE_H