Bug Summary

File:src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/lib/AST/ODRHash.cpp
Warning:line 632, column 7
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name ODRHash.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/gnu/usr.bin/clang/libclangAST/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/gnu/usr.bin/clang/libclangAST/obj/../include/clang/AST -I /usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/include -I /usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/llvm/include -I /usr/src/gnu/usr.bin/clang/libclangAST/../include -I /usr/src/gnu/usr.bin/clang/libclangAST/obj -I /usr/src/gnu/usr.bin/clang/libclangAST/obj/../include -D NDEBUG -D __STDC_LIMIT_MACROS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D LLVM_PREFIX="/usr" -internal-isystem /usr/include/c++/v1 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/usr/src/gnu/usr.bin/clang/libclangAST/obj -ferror-limit 19 -fvisibility-inlines-hidden -fwrapv -stack-protector 2 -fno-rtti -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c++ /usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/lib/AST/ODRHash.cpp
1//===-- ODRHash.cpp - Hashing to diagnose ODR failures ----------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8///
9/// \file
10/// This file implements the ODRHash class, which calculates a hash based
11/// on AST nodes, which is stable across different runs.
12///
13//===----------------------------------------------------------------------===//
14
15#include "clang/AST/ODRHash.h"
16
17#include "clang/AST/DeclVisitor.h"
18#include "clang/AST/NestedNameSpecifier.h"
19#include "clang/AST/StmtVisitor.h"
20#include "clang/AST/TypeVisitor.h"
21
22using namespace clang;
23
24void ODRHash::AddStmt(const Stmt *S) {
25 assert(S && "Expecting non-null pointer.")((void)0);
26 S->ProcessODRHash(ID, *this);
27}
28
29void ODRHash::AddIdentifierInfo(const IdentifierInfo *II) {
30 assert(II && "Expecting non-null pointer.")((void)0);
31 ID.AddString(II->getName());
32}
33
34void ODRHash::AddDeclarationName(DeclarationName Name, bool TreatAsDecl) {
35 if (TreatAsDecl)
36 // Matches the NamedDecl check in AddDecl
37 AddBoolean(true);
38
39 AddDeclarationNameImpl(Name);
40
41 if (TreatAsDecl)
42 // Matches the ClassTemplateSpecializationDecl check in AddDecl
43 AddBoolean(false);
44}
45
46void ODRHash::AddDeclarationNameImpl(DeclarationName Name) {
47 // Index all DeclarationName and use index numbers to refer to them.
48 auto Result = DeclNameMap.insert(std::make_pair(Name, DeclNameMap.size()));
49 ID.AddInteger(Result.first->second);
50 if (!Result.second) {
51 // If found in map, the DeclarationName has previously been processed.
52 return;
53 }
54
55 // First time processing each DeclarationName, also process its details.
56 AddBoolean(Name.isEmpty());
57 if (Name.isEmpty())
58 return;
59
60 auto Kind = Name.getNameKind();
61 ID.AddInteger(Kind);
62 switch (Kind) {
63 case DeclarationName::Identifier:
64 AddIdentifierInfo(Name.getAsIdentifierInfo());
65 break;
66 case DeclarationName::ObjCZeroArgSelector:
67 case DeclarationName::ObjCOneArgSelector:
68 case DeclarationName::ObjCMultiArgSelector: {
69 Selector S = Name.getObjCSelector();
70 AddBoolean(S.isNull());
71 AddBoolean(S.isKeywordSelector());
72 AddBoolean(S.isUnarySelector());
73 unsigned NumArgs = S.getNumArgs();
74 ID.AddInteger(NumArgs);
75 for (unsigned i = 0; i < NumArgs; ++i) {
76 const IdentifierInfo *II = S.getIdentifierInfoForSlot(i);
77 AddBoolean(II);
78 if (II) {
79 AddIdentifierInfo(II);
80 }
81 }
82 break;
83 }
84 case DeclarationName::CXXConstructorName:
85 case DeclarationName::CXXDestructorName:
86 AddQualType(Name.getCXXNameType());
87 break;
88 case DeclarationName::CXXOperatorName:
89 ID.AddInteger(Name.getCXXOverloadedOperator());
90 break;
91 case DeclarationName::CXXLiteralOperatorName:
92 AddIdentifierInfo(Name.getCXXLiteralIdentifier());
93 break;
94 case DeclarationName::CXXConversionFunctionName:
95 AddQualType(Name.getCXXNameType());
96 break;
97 case DeclarationName::CXXUsingDirective:
98 break;
99 case DeclarationName::CXXDeductionGuideName: {
100 auto *Template = Name.getCXXDeductionGuideTemplate();
101 AddBoolean(Template);
102 if (Template) {
103 AddDecl(Template);
104 }
105 }
106 }
107}
108
109void ODRHash::AddNestedNameSpecifier(const NestedNameSpecifier *NNS) {
110 assert(NNS && "Expecting non-null pointer.")((void)0);
111 const auto *Prefix = NNS->getPrefix();
112 AddBoolean(Prefix);
113 if (Prefix) {
114 AddNestedNameSpecifier(Prefix);
115 }
116 auto Kind = NNS->getKind();
117 ID.AddInteger(Kind);
118 switch (Kind) {
119 case NestedNameSpecifier::Identifier:
120 AddIdentifierInfo(NNS->getAsIdentifier());
121 break;
122 case NestedNameSpecifier::Namespace:
123 AddDecl(NNS->getAsNamespace());
124 break;
125 case NestedNameSpecifier::NamespaceAlias:
126 AddDecl(NNS->getAsNamespaceAlias());
127 break;
128 case NestedNameSpecifier::TypeSpec:
129 case NestedNameSpecifier::TypeSpecWithTemplate:
130 AddType(NNS->getAsType());
131 break;
132 case NestedNameSpecifier::Global:
133 case NestedNameSpecifier::Super:
134 break;
135 }
136}
137
138void ODRHash::AddTemplateName(TemplateName Name) {
139 auto Kind = Name.getKind();
140 ID.AddInteger(Kind);
141
142 switch (Kind) {
143 case TemplateName::Template:
144 AddDecl(Name.getAsTemplateDecl());
145 break;
146 // TODO: Support these cases.
147 case TemplateName::OverloadedTemplate:
148 case TemplateName::AssumedTemplate:
149 case TemplateName::QualifiedTemplate:
150 case TemplateName::DependentTemplate:
151 case TemplateName::SubstTemplateTemplateParm:
152 case TemplateName::SubstTemplateTemplateParmPack:
153 break;
154 }
155}
156
157void ODRHash::AddTemplateArgument(TemplateArgument TA) {
158 const auto Kind = TA.getKind();
159 ID.AddInteger(Kind);
160
161 switch (Kind) {
162 case TemplateArgument::Null:
163 llvm_unreachable("Expected valid TemplateArgument")__builtin_unreachable();
164 case TemplateArgument::Type:
165 AddQualType(TA.getAsType());
166 break;
167 case TemplateArgument::Declaration:
168 AddDecl(TA.getAsDecl());
169 break;
170 case TemplateArgument::NullPtr:
171 case TemplateArgument::Integral:
172 break;
173 case TemplateArgument::Template:
174 case TemplateArgument::TemplateExpansion:
175 AddTemplateName(TA.getAsTemplateOrTemplatePattern());
176 break;
177 case TemplateArgument::Expression:
178 AddStmt(TA.getAsExpr());
179 break;
180 case TemplateArgument::Pack:
181 ID.AddInteger(TA.pack_size());
182 for (auto SubTA : TA.pack_elements()) {
183 AddTemplateArgument(SubTA);
184 }
185 break;
186 }
187}
188
189void ODRHash::AddTemplateParameterList(const TemplateParameterList *TPL) {
190 assert(TPL && "Expecting non-null pointer.")((void)0);
191
192 ID.AddInteger(TPL->size());
193 for (auto *ND : TPL->asArray()) {
194 AddSubDecl(ND);
195 }
196}
197
198void ODRHash::clear() {
199 DeclNameMap.clear();
200 Bools.clear();
201 ID.clear();
202}
203
204unsigned ODRHash::CalculateHash() {
205 // Append the bools to the end of the data segment backwards. This allows
206 // for the bools data to be compressed 32 times smaller compared to using
207 // ID.AddBoolean
208 const unsigned unsigned_bits = sizeof(unsigned) * CHAR_BIT8;
209 const unsigned size = Bools.size();
210 const unsigned remainder = size % unsigned_bits;
211 const unsigned loops = size / unsigned_bits;
212 auto I = Bools.rbegin();
213 unsigned value = 0;
214 for (unsigned i = 0; i < remainder; ++i) {
215 value <<= 1;
216 value |= *I;
217 ++I;
218 }
219 ID.AddInteger(value);
220
221 for (unsigned i = 0; i < loops; ++i) {
222 value = 0;
223 for (unsigned j = 0; j < unsigned_bits; ++j) {
224 value <<= 1;
225 value |= *I;
226 ++I;
227 }
228 ID.AddInteger(value);
229 }
230
231 assert(I == Bools.rend())((void)0);
232 Bools.clear();
233 return ID.ComputeHash();
234}
235
236namespace {
237// Process a Decl pointer. Add* methods call back into ODRHash while Visit*
238// methods process the relevant parts of the Decl.
239class ODRDeclVisitor : public ConstDeclVisitor<ODRDeclVisitor> {
240 typedef ConstDeclVisitor<ODRDeclVisitor> Inherited;
241 llvm::FoldingSetNodeID &ID;
242 ODRHash &Hash;
243
244public:
245 ODRDeclVisitor(llvm::FoldingSetNodeID &ID, ODRHash &Hash)
246 : ID(ID), Hash(Hash) {}
247
248 void AddStmt(const Stmt *S) {
249 Hash.AddBoolean(S);
250 if (S) {
251 Hash.AddStmt(S);
252 }
253 }
254
255 void AddIdentifierInfo(const IdentifierInfo *II) {
256 Hash.AddBoolean(II);
257 if (II) {
258 Hash.AddIdentifierInfo(II);
259 }
260 }
261
262 void AddQualType(QualType T) {
263 Hash.AddQualType(T);
264 }
265
266 void AddDecl(const Decl *D) {
267 Hash.AddBoolean(D);
268 if (D) {
269 Hash.AddDecl(D);
270 }
271 }
272
273 void AddTemplateArgument(TemplateArgument TA) {
274 Hash.AddTemplateArgument(TA);
275 }
276
277 void Visit(const Decl *D) {
278 ID.AddInteger(D->getKind());
279 Inherited::Visit(D);
280 }
281
282 void VisitNamedDecl(const NamedDecl *D) {
283 Hash.AddDeclarationName(D->getDeclName());
284 Inherited::VisitNamedDecl(D);
285 }
286
287 void VisitValueDecl(const ValueDecl *D) {
288 if (!isa<FunctionDecl>(D)) {
289 AddQualType(D->getType());
290 }
291 Inherited::VisitValueDecl(D);
292 }
293
294 void VisitVarDecl(const VarDecl *D) {
295 Hash.AddBoolean(D->isStaticLocal());
296 Hash.AddBoolean(D->isConstexpr());
297 const bool HasInit = D->hasInit();
298 Hash.AddBoolean(HasInit);
299 if (HasInit) {
300 AddStmt(D->getInit());
301 }
302 Inherited::VisitVarDecl(D);
303 }
304
305 void VisitParmVarDecl(const ParmVarDecl *D) {
306 // TODO: Handle default arguments.
307 Inherited::VisitParmVarDecl(D);
308 }
309
310 void VisitAccessSpecDecl(const AccessSpecDecl *D) {
311 ID.AddInteger(D->getAccess());
312 Inherited::VisitAccessSpecDecl(D);
313 }
314
315 void VisitStaticAssertDecl(const StaticAssertDecl *D) {
316 AddStmt(D->getAssertExpr());
317 AddStmt(D->getMessage());
318
319 Inherited::VisitStaticAssertDecl(D);
320 }
321
322 void VisitFieldDecl(const FieldDecl *D) {
323 const bool IsBitfield = D->isBitField();
324 Hash.AddBoolean(IsBitfield);
325
326 if (IsBitfield) {
327 AddStmt(D->getBitWidth());
328 }
329
330 Hash.AddBoolean(D->isMutable());
331 AddStmt(D->getInClassInitializer());
332
333 Inherited::VisitFieldDecl(D);
334 }
335
336 void VisitFunctionDecl(const FunctionDecl *D) {
337 // Handled by the ODRHash for FunctionDecl
338 ID.AddInteger(D->getODRHash());
339
340 Inherited::VisitFunctionDecl(D);
341 }
342
343 void VisitCXXMethodDecl(const CXXMethodDecl *D) {
344 // Handled by the ODRHash for FunctionDecl
345
346 Inherited::VisitCXXMethodDecl(D);
347 }
348
349 void VisitTypedefNameDecl(const TypedefNameDecl *D) {
350 AddQualType(D->getUnderlyingType());
351
352 Inherited::VisitTypedefNameDecl(D);
353 }
354
355 void VisitTypedefDecl(const TypedefDecl *D) {
356 Inherited::VisitTypedefDecl(D);
357 }
358
359 void VisitTypeAliasDecl(const TypeAliasDecl *D) {
360 Inherited::VisitTypeAliasDecl(D);
361 }
362
363 void VisitFriendDecl(const FriendDecl *D) {
364 TypeSourceInfo *TSI = D->getFriendType();
365 Hash.AddBoolean(TSI);
366 if (TSI) {
367 AddQualType(TSI->getType());
368 } else {
369 AddDecl(D->getFriendDecl());
370 }
371 }
372
373 void VisitTemplateTypeParmDecl(const TemplateTypeParmDecl *D) {
374 // Only care about default arguments as part of the definition.
375 const bool hasDefaultArgument =
376 D->hasDefaultArgument() && !D->defaultArgumentWasInherited();
377 Hash.AddBoolean(hasDefaultArgument);
378 if (hasDefaultArgument) {
379 AddTemplateArgument(D->getDefaultArgument());
380 }
381 Hash.AddBoolean(D->isParameterPack());
382
383 const TypeConstraint *TC = D->getTypeConstraint();
384 Hash.AddBoolean(TC != nullptr);
385 if (TC)
386 AddStmt(TC->getImmediatelyDeclaredConstraint());
387
388 Inherited::VisitTemplateTypeParmDecl(D);
389 }
390
391 void VisitNonTypeTemplateParmDecl(const NonTypeTemplateParmDecl *D) {
392 // Only care about default arguments as part of the definition.
393 const bool hasDefaultArgument =
394 D->hasDefaultArgument() && !D->defaultArgumentWasInherited();
395 Hash.AddBoolean(hasDefaultArgument);
396 if (hasDefaultArgument) {
397 AddStmt(D->getDefaultArgument());
398 }
399 Hash.AddBoolean(D->isParameterPack());
400
401 Inherited::VisitNonTypeTemplateParmDecl(D);
402 }
403
404 void VisitTemplateTemplateParmDecl(const TemplateTemplateParmDecl *D) {
405 // Only care about default arguments as part of the definition.
406 const bool hasDefaultArgument =
407 D->hasDefaultArgument() && !D->defaultArgumentWasInherited();
408 Hash.AddBoolean(hasDefaultArgument);
409 if (hasDefaultArgument) {
410 AddTemplateArgument(D->getDefaultArgument().getArgument());
411 }
412 Hash.AddBoolean(D->isParameterPack());
413
414 Inherited::VisitTemplateTemplateParmDecl(D);
415 }
416
417 void VisitTemplateDecl(const TemplateDecl *D) {
418 Hash.AddTemplateParameterList(D->getTemplateParameters());
419
420 Inherited::VisitTemplateDecl(D);
421 }
422
423 void VisitRedeclarableTemplateDecl(const RedeclarableTemplateDecl *D) {
424 Hash.AddBoolean(D->isMemberSpecialization());
425 Inherited::VisitRedeclarableTemplateDecl(D);
426 }
427
428 void VisitFunctionTemplateDecl(const FunctionTemplateDecl *D) {
429 AddDecl(D->getTemplatedDecl());
430 ID.AddInteger(D->getTemplatedDecl()->getODRHash());
431 Inherited::VisitFunctionTemplateDecl(D);
432 }
433
434 void VisitEnumConstantDecl(const EnumConstantDecl *D) {
435 AddStmt(D->getInitExpr());
436 Inherited::VisitEnumConstantDecl(D);
437 }
438};
439} // namespace
440
441// Only allow a small portion of Decl's to be processed. Remove this once
442// all Decl's can be handled.
443bool ODRHash::isDeclToBeProcessed(const Decl *D, const DeclContext *Parent) {
444 if (D->isImplicit()) return false;
445 if (D->getDeclContext() != Parent) return false;
446
447 switch (D->getKind()) {
448 default:
449 return false;
450 case Decl::AccessSpec:
451 case Decl::CXXConstructor:
452 case Decl::CXXDestructor:
453 case Decl::CXXMethod:
454 case Decl::EnumConstant: // Only found in EnumDecl's.
455 case Decl::Field:
456 case Decl::Friend:
457 case Decl::FunctionTemplate:
458 case Decl::StaticAssert:
459 case Decl::TypeAlias:
460 case Decl::Typedef:
461 case Decl::Var:
462 return true;
463 }
464}
465
466void ODRHash::AddSubDecl(const Decl *D) {
467 assert(D && "Expecting non-null pointer.")((void)0);
468
469 ODRDeclVisitor(ID, *this).Visit(D);
470}
471
472void ODRHash::AddCXXRecordDecl(const CXXRecordDecl *Record) {
473 assert(Record && Record->hasDefinition() &&((void)0)
474 "Expected non-null record to be a definition.")((void)0);
475
476 const DeclContext *DC = Record;
477 while (DC) {
1
Assuming pointer value is null
→
2
←
Loop condition is false. Execution continues on line 484
→
478 if (isa<ClassTemplateSpecializationDecl>(DC)) {
479 return;
480 }
481 DC = DC->getParent();
482 }
483
484 AddDecl(Record);
3
←
Passing null pointer value via 1st parameter 'D'
→
4
←
Calling 'ODRHash::AddDecl'
→
485
486 // Filter out sub-Decls which will not be processed in order to get an
487 // accurate count of Decl's.
488 llvm::SmallVector<const Decl *, 16> Decls;
489 for (Decl *SubDecl : Record->decls()) {
490 if (isDeclToBeProcessed(SubDecl, Record)) {
491 Decls.push_back(SubDecl);
492 if (auto *Function = dyn_cast<FunctionDecl>(SubDecl)) {
493 // Compute/Preload ODRHash into FunctionDecl.
494 Function->getODRHash();
495 }
496 }
497 }
498
499 ID.AddInteger(Decls.size());
500 for (auto SubDecl : Decls) {
501 AddSubDecl(SubDecl);
502 }
503
504 const ClassTemplateDecl *TD = Record->getDescribedClassTemplate();
505 AddBoolean(TD);
506 if (TD) {
507 AddTemplateParameterList(TD->getTemplateParameters());
508 }
509
510 ID.AddInteger(Record->getNumBases());
511 auto Bases = Record->bases();
512 for (auto Base : Bases) {
513 AddQualType(Base.getType());
514 ID.AddInteger(Base.isVirtual());
515 ID.AddInteger(Base.getAccessSpecifierAsWritten());
516 }
517}
518
519void ODRHash::AddFunctionDecl(const FunctionDecl *Function,
520 bool SkipBody) {
521 assert(Function && "Expecting non-null pointer.")((void)0);
522
523 // Skip functions that are specializations or in specialization context.
524 const DeclContext *DC = Function;
525 while (DC) {
526 if (isa<ClassTemplateSpecializationDecl>(DC)) return;
527 if (auto *F = dyn_cast<FunctionDecl>(DC)) {
528 if (F->isFunctionTemplateSpecialization()) {
529 if (!isa<CXXMethodDecl>(DC)) return;
530 if (DC->getLexicalParent()->isFileContext()) return;
531 // Inline method specializations are the only supported
532 // specialization for now.
533 }
534 }
535 DC = DC->getParent();
536 }
537
538 ID.AddInteger(Function->getDeclKind());
539
540 const auto *SpecializationArgs = Function->getTemplateSpecializationArgs();
541 AddBoolean(SpecializationArgs);
542 if (SpecializationArgs) {
543 ID.AddInteger(SpecializationArgs->size());
544 for (const TemplateArgument &TA : SpecializationArgs->asArray()) {
545 AddTemplateArgument(TA);
546 }
547 }
548
549 if (const auto *Method = dyn_cast<CXXMethodDecl>(Function)) {
550 AddBoolean(Method->isConst());
551 AddBoolean(Method->isVolatile());
552 }
553
554 ID.AddInteger(Function->getStorageClass());
555 AddBoolean(Function->isInlineSpecified());
556 AddBoolean(Function->isVirtualAsWritten());
557 AddBoolean(Function->isPure());
558 AddBoolean(Function->isDeletedAsWritten());
559 AddBoolean(Function->isExplicitlyDefaulted());
560
561 AddDecl(Function);
562
563 AddQualType(Function->getReturnType());
564
565 ID.AddInteger(Function->param_size());
566 for (auto Param : Function->parameters())
567 AddSubDecl(Param);
568
569 if (SkipBody) {
570 AddBoolean(false);
571 return;
572 }
573
574 const bool HasBody = Function->isThisDeclarationADefinition() &&
575 !Function->isDefaulted() && !Function->isDeleted() &&
576 !Function->isLateTemplateParsed();
577 AddBoolean(HasBody);
578 if (!HasBody) {
579 return;
580 }
581
582 auto *Body = Function->getBody();
583 AddBoolean(Body);
584 if (Body)
585 AddStmt(Body);
586
587 // Filter out sub-Decls which will not be processed in order to get an
588 // accurate count of Decl's.
589 llvm::SmallVector<const Decl *, 16> Decls;
590 for (Decl *SubDecl : Function->decls()) {
591 if (isDeclToBeProcessed(SubDecl, Function)) {
592 Decls.push_back(SubDecl);
593 }
594 }
595
596 ID.AddInteger(Decls.size());
597 for (auto SubDecl : Decls) {
598 AddSubDecl(SubDecl);
599 }
600}
601
602void ODRHash::AddEnumDecl(const EnumDecl *Enum) {
603 assert(Enum)((void)0);
604 AddDeclarationName(Enum->getDeclName());
605
606 AddBoolean(Enum->isScoped());
607 if (Enum->isScoped())
608 AddBoolean(Enum->isScopedUsingClassTag());
609
610 if (Enum->getIntegerTypeSourceInfo())
611 AddQualType(Enum->getIntegerType());
612
613 // Filter out sub-Decls which will not be processed in order to get an
614 // accurate count of Decl's.
615 llvm::SmallVector<const Decl *, 16> Decls;
616 for (Decl *SubDecl : Enum->decls()) {
617 if (isDeclToBeProcessed(SubDecl, Enum)) {
618 assert(isa<EnumConstantDecl>(SubDecl) && "Unexpected Decl")((void)0);
619 Decls.push_back(SubDecl);
620 }
621 }
622
623 ID.AddInteger(Decls.size());
624 for (auto SubDecl : Decls) {
625 AddSubDecl(SubDecl);
626 }
627
628}
629
630void ODRHash::AddDecl(const Decl *D) {
631 assert(D && "Expecting non-null pointer.")((void)0);
632 D = D->getCanonicalDecl();
5
←
Called C++ object pointer is null
633
634 const NamedDecl *ND = dyn_cast<NamedDecl>(D);
635 AddBoolean(ND);
636 if (!ND) {
637 ID.AddInteger(D->getKind());
638 return;
639 }
640
641 AddDeclarationName(ND->getDeclName());
642
643 const auto *Specialization =
644 dyn_cast<ClassTemplateSpecializationDecl>(D);
645 AddBoolean(Specialization);
646 if (Specialization) {
647 const TemplateArgumentList &List = Specialization->getTemplateArgs();
648 ID.AddInteger(List.size());
649 for (const TemplateArgument &TA : List.asArray())
650 AddTemplateArgument(TA);
651 }
652}
653
654namespace {
655// Process a Type pointer. Add* methods call back into ODRHash while Visit*
656// methods process the relevant parts of the Type.
657class ODRTypeVisitor : public TypeVisitor<ODRTypeVisitor> {
658 typedef TypeVisitor<ODRTypeVisitor> Inherited;
659 llvm::FoldingSetNodeID &ID;
660 ODRHash &Hash;
661
662public:
663 ODRTypeVisitor(llvm::FoldingSetNodeID &ID, ODRHash &Hash)
664 : ID(ID), Hash(Hash) {}
665
666 void AddStmt(Stmt *S) {
667 Hash.AddBoolean(S);
668 if (S) {
669 Hash.AddStmt(S);
670 }
671 }
672
673 void AddDecl(Decl *D) {
674 Hash.AddBoolean(D);
675 if (D) {
676 Hash.AddDecl(D);
677 }
678 }
679
680 void AddQualType(QualType T) {
681 Hash.AddQualType(T);
682 }
683
684 void AddType(const Type *T) {
685 Hash.AddBoolean(T);
686 if (T) {
687 Hash.AddType(T);
688 }
689 }
690
691 void AddNestedNameSpecifier(const NestedNameSpecifier *NNS) {
692 Hash.AddBoolean(NNS);
693 if (NNS) {
694 Hash.AddNestedNameSpecifier(NNS);
695 }
696 }
697
698 void AddIdentifierInfo(const IdentifierInfo *II) {
699 Hash.AddBoolean(II);
700 if (II) {
701 Hash.AddIdentifierInfo(II);
702 }
703 }
704
705 void VisitQualifiers(Qualifiers Quals) {
706 ID.AddInteger(Quals.getAsOpaqueValue());
707 }
708
709 // Return the RecordType if the typedef only strips away a keyword.
710 // Otherwise, return the original type.
711 static const Type *RemoveTypedef(const Type *T) {
712 const auto *TypedefT = dyn_cast<TypedefType>(T);
713 if (!TypedefT) {
714 return T;
715 }
716
717 const TypedefNameDecl *D = TypedefT->getDecl();
718 QualType UnderlyingType = D->getUnderlyingType();
719
720 if (UnderlyingType.hasLocalQualifiers()) {
721 return T;
722 }
723
724 const auto *ElaboratedT = dyn_cast<ElaboratedType>(UnderlyingType);
725 if (!ElaboratedT) {
726 return T;
727 }
728
729 if (ElaboratedT->getQualifier() != nullptr) {
730 return T;
731 }
732
733 QualType NamedType = ElaboratedT->getNamedType();
734 if (NamedType.hasLocalQualifiers()) {
735 return T;
736 }
737
738 const auto *RecordT = dyn_cast<RecordType>(NamedType);
739 if (!RecordT) {
740 return T;
741 }
742
743 const IdentifierInfo *TypedefII = TypedefT->getDecl()->getIdentifier();
744 const IdentifierInfo *RecordII = RecordT->getDecl()->getIdentifier();
745 if (!TypedefII || !RecordII ||
746 TypedefII->getName() != RecordII->getName()) {
747 return T;
748 }
749
750 return RecordT;
751 }
752
753 void Visit(const Type *T) {
754 T = RemoveTypedef(T);
755 ID.AddInteger(T->getTypeClass());
756 Inherited::Visit(T);
757 }
758
759 void VisitType(const Type *T) {}
760
761 void VisitAdjustedType(const AdjustedType *T) {
762 QualType Original = T->getOriginalType();
763 QualType Adjusted = T->getAdjustedType();
764
765 // The original type and pointee type can be the same, as in the case of
766 // function pointers decaying to themselves. Set a bool and only process
767 // the type once, to prevent doubling the work.
768 SplitQualType split = Adjusted.split();
769 if (auto Pointer = dyn_cast<PointerType>(split.Ty)) {
770 if (Pointer->getPointeeType() == Original) {
771 Hash.AddBoolean(true);
772 ID.AddInteger(split.Quals.getAsOpaqueValue());
773 AddQualType(Original);
774 VisitType(T);
775 return;
776 }
777 }
778
779 // The original type and pointee type are different, such as in the case
780 // of a array decaying to an element pointer. Set a bool to false and
781 // process both types.
782 Hash.AddBoolean(false);
783 AddQualType(Original);
784 AddQualType(Adjusted);
785
786 VisitType(T);
787 }
788
789 void VisitDecayedType(const DecayedType *T) {
790 // getDecayedType and getPointeeType are derived from getAdjustedType
791 // and don't need to be separately processed.
792 VisitAdjustedType(T);
793 }
794
795 void VisitArrayType(const ArrayType *T) {
796 AddQualType(T->getElementType());
797 ID.AddInteger(T->getSizeModifier());
798 VisitQualifiers(T->getIndexTypeQualifiers());
799 VisitType(T);
800 }
801 void VisitConstantArrayType(const ConstantArrayType *T) {
802 T->getSize().Profile(ID);
803 VisitArrayType(T);
804 }
805
806 void VisitDependentSizedArrayType(const DependentSizedArrayType *T) {
807 AddStmt(T->getSizeExpr());
808 VisitArrayType(T);
809 }
810
811 void VisitIncompleteArrayType(const IncompleteArrayType *T) {
812 VisitArrayType(T);
813 }
814
815 void VisitVariableArrayType(const VariableArrayType *T) {
816 AddStmt(T->getSizeExpr());
817 VisitArrayType(T);
818 }
819
820 void VisitAttributedType(const AttributedType *T) {
821 ID.AddInteger(T->getAttrKind());
822 AddQualType(T->getModifiedType());
823 AddQualType(T->getEquivalentType());
824
825 VisitType(T);
826 }
827
828 void VisitBlockPointerType(const BlockPointerType *T) {
829 AddQualType(T->getPointeeType());
830 VisitType(T);
831 }
832
833 void VisitBuiltinType(const BuiltinType *T) {
834 ID.AddInteger(T->getKind());
835 VisitType(T);
836 }
837
838 void VisitComplexType(const ComplexType *T) {
839 AddQualType(T->getElementType());
840 VisitType(T);
841 }
842
843 void VisitDecltypeType(const DecltypeType *T) {
844 AddStmt(T->getUnderlyingExpr());
845 AddQualType(T->getUnderlyingType());
846 VisitType(T);
847 }
848
849 void VisitDependentDecltypeType(const DependentDecltypeType *T) {
850 VisitDecltypeType(T);
851 }
852
853 void VisitDeducedType(const DeducedType *T) {
854 AddQualType(T->getDeducedType());
855 VisitType(T);
856 }
857
858 void VisitAutoType(const AutoType *T) {
859 ID.AddInteger((unsigned)T->getKeyword());
860 ID.AddInteger(T->isConstrained());
861 if (T->isConstrained()) {
862 AddDecl(T->getTypeConstraintConcept());
863 ID.AddInteger(T->getNumArgs());
864 for (const auto &TA : T->getTypeConstraintArguments())
865 Hash.AddTemplateArgument(TA);
866 }
867 VisitDeducedType(T);
868 }
869
870 void VisitDeducedTemplateSpecializationType(
871 const DeducedTemplateSpecializationType *T) {
872 Hash.AddTemplateName(T->getTemplateName());
873 VisitDeducedType(T);
874 }
875
876 void VisitDependentAddressSpaceType(const DependentAddressSpaceType *T) {
877 AddQualType(T->getPointeeType());
878 AddStmt(T->getAddrSpaceExpr());
879 VisitType(T);
880 }
881
882 void VisitDependentSizedExtVectorType(const DependentSizedExtVectorType *T) {
883 AddQualType(T->getElementType());
884 AddStmt(T->getSizeExpr());
885 VisitType(T);
886 }
887
888 void VisitFunctionType(const FunctionType *T) {
889 AddQualType(T->getReturnType());
890 T->getExtInfo().Profile(ID);
891 Hash.AddBoolean(T->isConst());
892 Hash.AddBoolean(T->isVolatile());
893 Hash.AddBoolean(T->isRestrict());
894 VisitType(T);
895 }
896
897 void VisitFunctionNoProtoType(const FunctionNoProtoType *T) {
898 VisitFunctionType(T);
899 }
900
901 void VisitFunctionProtoType(const FunctionProtoType *T) {
902 ID.AddInteger(T->getNumParams());
903 for (auto ParamType : T->getParamTypes())
904 AddQualType(ParamType);
905
906 VisitFunctionType(T);
907 }
908
909 void VisitInjectedClassNameType(const InjectedClassNameType *T) {
910 AddDecl(T->getDecl());
911 VisitType(T);
912 }
913
914 void VisitMemberPointerType(const MemberPointerType *T) {
915 AddQualType(T->getPointeeType());
916 AddType(T->getClass());
917 VisitType(T);
918 }
919
920 void VisitObjCObjectPointerType(const ObjCObjectPointerType *T) {
921 AddQualType(T->getPointeeType());
922 VisitType(T);
923 }
924
925 void VisitObjCObjectType(const ObjCObjectType *T) {
926 AddDecl(T->getInterface());
927
928 auto TypeArgs = T->getTypeArgsAsWritten();
929 ID.AddInteger(TypeArgs.size());
930 for (auto Arg : TypeArgs) {
931 AddQualType(Arg);
932 }
933
934 auto Protocols = T->getProtocols();
935 ID.AddInteger(Protocols.size());
936 for (auto Protocol : Protocols) {
937 AddDecl(Protocol);
938 }
939
940 Hash.AddBoolean(T->isKindOfType());
941
942 VisitType(T);
943 }
944
945 void VisitObjCInterfaceType(const ObjCInterfaceType *T) {
946 // This type is handled by the parent type ObjCObjectType.
947 VisitObjCObjectType(T);
948 }
949
950 void VisitObjCTypeParamType(const ObjCTypeParamType *T) {
951 AddDecl(T->getDecl());
952 auto Protocols = T->getProtocols();
953 ID.AddInteger(Protocols.size());
954 for (auto Protocol : Protocols) {
955 AddDecl(Protocol);
956 }
957
958 VisitType(T);
959 }
960
961 void VisitPackExpansionType(const PackExpansionType *T) {
962 AddQualType(T->getPattern());
963 VisitType(T);
964 }
965
966 void VisitParenType(const ParenType *T) {
967 AddQualType(T->getInnerType());
968 VisitType(T);
969 }
970
971 void VisitPipeType(const PipeType *T) {
972 AddQualType(T->getElementType());
973 Hash.AddBoolean(T->isReadOnly());
974 VisitType(T);
975 }
976
977 void VisitPointerType(const PointerType *T) {
978 AddQualType(T->getPointeeType());
979 VisitType(T);
980 }
981
982 void VisitReferenceType(const ReferenceType *T) {
983 AddQualType(T->getPointeeTypeAsWritten());
984 VisitType(T);
985 }
986
987 void VisitLValueReferenceType(const LValueReferenceType *T) {
988 VisitReferenceType(T);
989 }
990
991 void VisitRValueReferenceType(const RValueReferenceType *T) {
992 VisitReferenceType(T);
993 }
994
995 void
996 VisitSubstTemplateTypeParmPackType(const SubstTemplateTypeParmPackType *T) {
997 AddType(T->getReplacedParameter());
998 Hash.AddTemplateArgument(T->getArgumentPack());
999 VisitType(T);
1000 }
1001
1002 void VisitSubstTemplateTypeParmType(const SubstTemplateTypeParmType *T) {
1003 AddType(T->getReplacedParameter());
1004 AddQualType(T->getReplacementType());
1005 VisitType(T);
1006 }
1007
1008 void VisitTagType(const TagType *T) {
1009 AddDecl(T->getDecl());
1010 VisitType(T);
1011 }
1012
1013 void VisitRecordType(const RecordType *T) { VisitTagType(T); }
1014 void VisitEnumType(const EnumType *T) { VisitTagType(T); }
1015
1016 void VisitTemplateSpecializationType(const TemplateSpecializationType *T) {
1017 ID.AddInteger(T->getNumArgs());
1018 for (const auto &TA : T->template_arguments()) {
1019 Hash.AddTemplateArgument(TA);
1020 }
1021 Hash.AddTemplateName(T->getTemplateName());
1022 VisitType(T);
1023 }
1024
1025 void VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
1026 ID.AddInteger(T->getDepth());
1027 ID.AddInteger(T->getIndex());
1028 Hash.AddBoolean(T->isParameterPack());
1029 AddDecl(T->getDecl());
1030 }
1031
1032 void VisitTypedefType(const TypedefType *T) {
1033 AddDecl(T->getDecl());
1034 QualType UnderlyingType = T->getDecl()->getUnderlyingType();
1035 VisitQualifiers(UnderlyingType.getQualifiers());
1036 while (true) {
1037 if (const TypedefType *Underlying =
1038 dyn_cast<TypedefType>(UnderlyingType.getTypePtr())) {
1039 UnderlyingType = Underlying->getDecl()->getUnderlyingType();
1040 continue;
1041 }
1042 if (const ElaboratedType *Underlying =
1043 dyn_cast<ElaboratedType>(UnderlyingType.getTypePtr())) {
1044 UnderlyingType = Underlying->getNamedType();
1045 continue;
1046 }
1047
1048 break;
1049 }
1050 AddType(UnderlyingType.getTypePtr());
1051 VisitType(T);
1052 }
1053
1054 void VisitTypeOfExprType(const TypeOfExprType *T) {
1055 AddStmt(T->getUnderlyingExpr());
1056 Hash.AddBoolean(T->isSugared());
1057 if (T->isSugared())
1058 AddQualType(T->desugar());
1059
1060 VisitType(T);
1061 }
1062 void VisitTypeOfType(const TypeOfType *T) {
1063 AddQualType(T->getUnderlyingType());
1064 VisitType(T);
1065 }
1066
1067 void VisitTypeWithKeyword(const TypeWithKeyword *T) {
1068 ID.AddInteger(T->getKeyword());
1069 VisitType(T);
1070 };
1071
1072 void VisitDependentNameType(const DependentNameType *T) {
1073 AddNestedNameSpecifier(T->getQualifier());
1074 AddIdentifierInfo(T->getIdentifier());
1075 VisitTypeWithKeyword(T);
1076 }
1077
1078 void VisitDependentTemplateSpecializationType(
1079 const DependentTemplateSpecializationType *T) {
1080 AddIdentifierInfo(T->getIdentifier());
1081 AddNestedNameSpecifier(T->getQualifier());
1082 ID.AddInteger(T->getNumArgs());
1083 for (const auto &TA : T->template_arguments()) {
1084 Hash.AddTemplateArgument(TA);
1085 }
1086 VisitTypeWithKeyword(T);
1087 }
1088
1089 void VisitElaboratedType(const ElaboratedType *T) {
1090 AddNestedNameSpecifier(T->getQualifier());
1091 AddQualType(T->getNamedType());
1092 VisitTypeWithKeyword(T);
1093 }
1094
1095 void VisitUnaryTransformType(const UnaryTransformType *T) {
1096 AddQualType(T->getUnderlyingType());
1097 AddQualType(T->getBaseType());
1098 VisitType(T);
1099 }
1100
1101 void VisitUnresolvedUsingType(const UnresolvedUsingType *T) {
1102 AddDecl(T->getDecl());
1103 VisitType(T);
1104 }
1105
1106 void VisitVectorType(const VectorType *T) {
1107 AddQualType(T->getElementType());
1108 ID.AddInteger(T->getNumElements());
1109 ID.AddInteger(T->getVectorKind());
1110 VisitType(T);
1111 }
1112
1113 void VisitExtVectorType(const ExtVectorType * T) {
1114 VisitVectorType(T);
1115 }
1116};
1117} // namespace
1118
1119void ODRHash::AddType(const Type *T) {
1120 assert(T && "Expecting non-null pointer.")((void)0);
1121 ODRTypeVisitor(ID, *this).Visit(T);
1122}
1123
1124void ODRHash::AddQualType(QualType T) {
1125 AddBoolean(T.isNull());
1126 if (T.isNull())
1127 return;
1128 SplitQualType split = T.split();
1129 ID.AddInteger(split.Quals.getAsOpaqueValue());
1130 AddType(split.Ty);
1131}
1132
1133void ODRHash::AddBoolean(bool Value) {
1134 Bools.push_back(Value);
1135}