| File: | src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/lib/Sema/SemaInit.cpp |
| Warning: | line 9215, column 25 Called C++ object pointer is null |
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| 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 | |
| 32 | using 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). |
| 40 | static 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 | |
| 50 | enum 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. |
| 64 | static 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 | |
| 137 | static 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 | |
| 145 | bool 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. |
| 151 | static 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. |
| 174 | static 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 | |
| 194 | static 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 | |
| 252 | namespace { |
| 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. |
| 285 | class 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 | |
| 477 | public: |
| 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 | |
| 490 | ExprResult 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 | |
| 601 | void 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 | |
| 611 | void 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 | |
| 643 | void 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. |
| 740 | void |
| 741 | InitListChecker::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 | |
| 936 | static 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 | |
| 943 | InitListChecker::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 | |
| 975 | int 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 | |
| 985 | int 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. |
| 1001 | static 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. |
| 1045 | void 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. |
| 1124 | static 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. |
| 1192 | void 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 | |
| 1273 | void 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 | |
| 1338 | void 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 | |
| 1512 | void 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 | |
| 1548 | void 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 | |
| 1626 | void 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 | |
| 1681 | void 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. |
| 1842 | static 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 | |
| 1856 | void 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 | |
| 1997 | bool 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 | |
| 2035 | void 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 | /// |
| 2298 | static 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 | |
| 2326 | static 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 | |
| 2338 | namespace { |
| 2339 | |
| 2340 | // Callback to only accept typo corrections that are for field members of |
| 2341 | // the given struct or union. |
| 2342 | class 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. |
| 2399 | bool |
| 2400 | InitListChecker::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. |
| 3015 | InitListExpr * |
| 3016 | InitListChecker::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 | |
| 3081 | InitListExpr * |
| 3082 | InitListChecker::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. |
| 3120 | void 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. |
| 3142 | bool 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. |
| 3158 | static ExprResult |
| 3159 | CheckArrayDesignatorExpr(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 | |
| 3176 | ExprResult 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 | |
| 3271 | InitializedEntity::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 | |
| 3289 | InitializedEntity |
| 3290 | InitializedEntity::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 | |
| 3302 | DeclarationName 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 | |
| 3339 | ValueDecl *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 | |
| 3372 | bool 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 | |
| 3403 | unsigned 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 | |
| 3449 | LLVM_DUMP_METHOD__attribute__((noinline)) void InitializedEntity::dump() const { |
| 3450 | dumpImpl(llvm::errs()); |
| 3451 | } |
| 3452 | |
| 3453 | //===----------------------------------------------------------------------===// |
| 3454 | // Initialization sequence |
| 3455 | //===----------------------------------------------------------------------===// |
| 3456 | |
| 3457 | void 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 | |
| 3502 | bool 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 | |
| 3513 | bool 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 | |
| 3565 | bool InitializationSequence::isConstructorInitialization() const { |
| 3566 | return !Steps.empty() && Steps.back().Kind == SK_ConstructorInitialization; |
| 3567 | } |
| 3568 | |
| 3569 | void |
| 3570 | InitializationSequence |
| 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 | |
| 3583 | void 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 | |
| 3597 | void 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 | |
| 3605 | void InitializationSequence::AddFinalCopy(QualType T) { |
| 3606 | Step S; |
| 3607 | S.Kind = SK_FinalCopy; |
| 3608 | S.Type = T; |
| 3609 | Steps.push_back(S); |
| 3610 | } |
| 3611 | |
| 3612 | void InitializationSequence::AddExtraneousCopyToTemporary(QualType T) { |
| 3613 | Step S; |
| 3614 | S.Kind = SK_ExtraneousCopyToTemporary; |
| 3615 | S.Type = T; |
| 3616 | Steps.push_back(S); |
| 3617 | } |
| 3618 | |
| 3619 | void |
| 3620 | InitializationSequence::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 | |
| 3633 | void 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 | |
| 3652 | void InitializationSequence::AddFunctionReferenceConversionStep(QualType Ty) { |
| 3653 | Step S; |
| 3654 | S.Kind = SK_FunctionReferenceConversion; |
| 3655 | S.Type = Ty; |
| 3656 | Steps.push_back(S); |
| 3657 | } |
| 3658 | |
| 3659 | void InitializationSequence::AddAtomicConversionStep(QualType Ty) { |
| 3660 | Step S; |
| 3661 | S.Kind = SK_AtomicConversion; |
| 3662 | S.Type = Ty; |
| 3663 | Steps.push_back(S); |
| 3664 | } |
| 3665 | |
| 3666 | void 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 | |
| 3677 | void InitializationSequence::AddListInitializationStep(QualType T) { |
| 3678 | Step S; |
| 3679 | S.Kind = SK_ListInitialization; |
| 3680 | S.Type = T; |
| 3681 | Steps.push_back(S); |
| 3682 | } |
| 3683 | |
| 3684 | void 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 | |
| 3698 | void InitializationSequence::AddZeroInitializationStep(QualType T) { |
| 3699 | Step S; |
| 3700 | S.Kind = SK_ZeroInitialization; |
| 3701 | S.Type = T; |
| 3702 | Steps.push_back(S); |
| 3703 | } |
| 3704 | |
| 3705 | void InitializationSequence::AddCAssignmentStep(QualType T) { |
| 3706 | Step S; |
| 3707 | S.Kind = SK_CAssignment; |
| 3708 | S.Type = T; |
| 3709 | Steps.push_back(S); |
| 3710 | } |
| 3711 | |
| 3712 | void InitializationSequence::AddStringInitStep(QualType T) { |
| 3713 | Step S; |
| 3714 | S.Kind = SK_StringInit; |
| 3715 | S.Type = T; |
| 3716 | Steps.push_back(S); |
| 3717 | } |
| 3718 | |
| 3719 | void InitializationSequence::AddObjCObjectConversionStep(QualType T) { |
| 3720 | Step S; |
| 3721 | S.Kind = SK_ObjCObjectConversion; |
| 3722 | S.Type = T; |
| 3723 | Steps.push_back(S); |
| 3724 | } |
| 3725 | |
| 3726 | void 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 | |
| 3733 | void 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 | |
| 3744 | void InitializationSequence::AddParenthesizedArrayInitStep(QualType T) { |
| 3745 | Step S; |
| 3746 | S.Kind = SK_ParenthesizedArrayInit; |
| 3747 | S.Type = T; |
| 3748 | Steps.push_back(S); |
| 3749 | } |
| 3750 | |
| 3751 | void 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 | |
| 3760 | void InitializationSequence::AddProduceObjCObjectStep(QualType T) { |
| 3761 | Step S; |
| 3762 | S.Kind = SK_ProduceObjCObject; |
| 3763 | S.Type = T; |
| 3764 | Steps.push_back(S); |
| 3765 | } |
| 3766 | |
| 3767 | void InitializationSequence::AddStdInitializerListConstructionStep(QualType T) { |
| 3768 | Step S; |
| 3769 | S.Kind = SK_StdInitializerList; |
| 3770 | S.Type = T; |
| 3771 | Steps.push_back(S); |
| 3772 | } |
| 3773 | |
| 3774 | void InitializationSequence::AddOCLSamplerInitStep(QualType T) { |
| 3775 | Step S; |
| 3776 | S.Kind = SK_OCLSamplerInit; |
| 3777 | S.Type = T; |
| 3778 | Steps.push_back(S); |
| 3779 | } |
| 3780 | |
| 3781 | void InitializationSequence::AddOCLZeroOpaqueTypeStep(QualType T) { |
| 3782 | Step S; |
| 3783 | S.Kind = SK_OCLZeroOpaqueType; |
| 3784 | S.Type = T; |
| 3785 | Steps.push_back(S); |
| 3786 | } |
| 3787 | |
| 3788 | void 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 | |
| 3803 | void 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. |
| 3815 | static bool |
| 3816 | maybeRecoverWithZeroInitialization(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 | |
| 3836 | static 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 | |
| 3864 | static 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. |
| 3876 | static 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. |
| 3911 | static 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 | |
| 3924 | static OverloadingResult |
| 3925 | ResolveConstructorOverload(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? |
| 4041 | static 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 | |
| 4220 | static bool |
| 4221 | ResolveOverloadedFunctionForReferenceBinding(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 | |
| 4248 | static 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 | |
| 4258 | static 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. |
| 4265 | static 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]) |
| 4356 | static 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. |
| 4556 | static 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 | |
| 4736 | static void CheckCXX98CompatAccessibleCopy(Sema &S, |
| 4737 | const InitializedEntity &Entity, |
| 4738 | Expr *CurInitExpr); |
| 4739 | |
| 4740 | /// Attempt reference initialization (C++0x [dcl.init.ref]) |
| 4741 | static 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. |
| 4769 | static 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()). |
| 4778 | static 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). |
| 5100 | static 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). |
| 5109 | static 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). |
| 5187 | static 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. |
| 5228 | static 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. |
| 5415 | static 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. |
| 5427 | enum InvalidICRKind { IIK_okay, IIK_nonlocal, IIK_nonscalar }; |
| 5428 | |
| 5429 | /// Determines whether this expression is an acceptable ICR source. |
| 5430 | static 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. |
| 5497 | static 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. |
| 5515 | static 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 | |
| 5531 | static 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 | |
| 5578 | static bool TryOCLSamplerInitialization(Sema &S, |
| 5579 | InitializationSequence &Sequence, |
| 5580 | QualType DestType, |
| 5581 | Expr *Initializer) { |
| 5582 | if (!S.getLangOpts().OpenCL || !DestType->isSamplerT() || |
| 5583 | (!Initializer->isIntegerConstantExpr(S.Context) && |
| 5584 | !Initializer->getType()->isSamplerT())) |
| 5585 | return false; |
| 5586 | |
| 5587 | Sequence.AddOCLSamplerInitStep(DestType); |
| 5588 | return true; |
| 5589 | } |
| 5590 | |
| 5591 | static bool IsZeroInitializer(Expr *Initializer, Sema &S) { |
| 5592 | return Initializer->isIntegerConstantExpr(S.getASTContext()) && |
| 5593 | (Initializer->EvaluateKnownConstInt(S.getASTContext()) == 0); |
| 5594 | } |
| 5595 | |
| 5596 | static 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 | |
| 5638 | InitializationSequence::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. |
| 5649 | static 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. |
| 5660 | static 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 | |
| 5694 | void 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) |
| 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() || |
| 5726 | Expr::hasAnyTypeDependentArguments(Args)) { |
| 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; |
| 5736 | if (Args.size() == 1) { |
| 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) { |
| 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()) { |
| 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 || |
| 5781 | (Kind.getKind() == InitializationKind::IK_Direct && Args.empty())) { |
| 5782 | TryValueInitialization(S, Entity, Kind, *this); |
| 5783 | return; |
| 5784 | } |
| 5785 | |
| 5786 | // Handle default initialization. |
| 5787 | if (Kind.getKind() == InitializationKind::IK_Default) { |
| 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)) { |
| 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 && |
| 5893 | Entity.isParameterKind(); |
| 5894 | |
| 5895 | if (TryOCLSamplerInitialization(S, *this, DestType, Initializer)) |
| 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 | |
| 6045 | InitializationSequence::~InitializationSequence() { |
| 6046 | for (auto &S : Steps) |
| 6047 | S.Destroy(); |
| 6048 | } |
| 6049 | |
| 6050 | //===----------------------------------------------------------------------===// |
| 6051 | // Perform initialization |
| 6052 | //===----------------------------------------------------------------------===// |
| 6053 | static Sema::AssignmentAction |
| 6054 | getAssignmentAction(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. |
| 6108 | static 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. |
| 6141 | static 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: |