File: | clang/lib/Sema/SemaDecl.cpp |
Warning: | line 3686, column 35 Called C++ object pointer is null |
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1 | //===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// | ||||
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 declarations. | ||||
10 | // | ||||
11 | //===----------------------------------------------------------------------===// | ||||
12 | |||||
13 | #include "TypeLocBuilder.h" | ||||
14 | #include "clang/AST/ASTConsumer.h" | ||||
15 | #include "clang/AST/ASTContext.h" | ||||
16 | #include "clang/AST/ASTLambda.h" | ||||
17 | #include "clang/AST/CXXInheritance.h" | ||||
18 | #include "clang/AST/CharUnits.h" | ||||
19 | #include "clang/AST/CommentDiagnostic.h" | ||||
20 | #include "clang/AST/DeclCXX.h" | ||||
21 | #include "clang/AST/DeclObjC.h" | ||||
22 | #include "clang/AST/DeclTemplate.h" | ||||
23 | #include "clang/AST/EvaluatedExprVisitor.h" | ||||
24 | #include "clang/AST/Expr.h" | ||||
25 | #include "clang/AST/ExprCXX.h" | ||||
26 | #include "clang/AST/NonTrivialTypeVisitor.h" | ||||
27 | #include "clang/AST/StmtCXX.h" | ||||
28 | #include "clang/Basic/Builtins.h" | ||||
29 | #include "clang/Basic/PartialDiagnostic.h" | ||||
30 | #include "clang/Basic/SourceManager.h" | ||||
31 | #include "clang/Basic/TargetInfo.h" | ||||
32 | #include "clang/Lex/HeaderSearch.h" // TODO: Sema shouldn't depend on Lex | ||||
33 | #include "clang/Lex/Lexer.h" // TODO: Extract static functions to fix layering. | ||||
34 | #include "clang/Lex/ModuleLoader.h" // TODO: Sema shouldn't depend on Lex | ||||
35 | #include "clang/Lex/Preprocessor.h" // Included for isCodeCompletionEnabled() | ||||
36 | #include "clang/Sema/CXXFieldCollector.h" | ||||
37 | #include "clang/Sema/DeclSpec.h" | ||||
38 | #include "clang/Sema/DelayedDiagnostic.h" | ||||
39 | #include "clang/Sema/Initialization.h" | ||||
40 | #include "clang/Sema/Lookup.h" | ||||
41 | #include "clang/Sema/ParsedTemplate.h" | ||||
42 | #include "clang/Sema/Scope.h" | ||||
43 | #include "clang/Sema/ScopeInfo.h" | ||||
44 | #include "clang/Sema/SemaInternal.h" | ||||
45 | #include "clang/Sema/Template.h" | ||||
46 | #include "llvm/ADT/SmallString.h" | ||||
47 | #include "llvm/ADT/Triple.h" | ||||
48 | #include <algorithm> | ||||
49 | #include <cstring> | ||||
50 | #include <functional> | ||||
51 | #include <unordered_map> | ||||
52 | |||||
53 | using namespace clang; | ||||
54 | using namespace sema; | ||||
55 | |||||
56 | Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { | ||||
57 | if (OwnedType) { | ||||
58 | Decl *Group[2] = { OwnedType, Ptr }; | ||||
59 | return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); | ||||
60 | } | ||||
61 | |||||
62 | return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); | ||||
63 | } | ||||
64 | |||||
65 | namespace { | ||||
66 | |||||
67 | class TypeNameValidatorCCC final : public CorrectionCandidateCallback { | ||||
68 | public: | ||||
69 | TypeNameValidatorCCC(bool AllowInvalid, bool WantClass = false, | ||||
70 | bool AllowTemplates = false, | ||||
71 | bool AllowNonTemplates = true) | ||||
72 | : AllowInvalidDecl(AllowInvalid), WantClassName(WantClass), | ||||
73 | AllowTemplates(AllowTemplates), AllowNonTemplates(AllowNonTemplates) { | ||||
74 | WantExpressionKeywords = false; | ||||
75 | WantCXXNamedCasts = false; | ||||
76 | WantRemainingKeywords = false; | ||||
77 | } | ||||
78 | |||||
79 | bool ValidateCandidate(const TypoCorrection &candidate) override { | ||||
80 | if (NamedDecl *ND = candidate.getCorrectionDecl()) { | ||||
81 | if (!AllowInvalidDecl && ND->isInvalidDecl()) | ||||
82 | return false; | ||||
83 | |||||
84 | if (getAsTypeTemplateDecl(ND)) | ||||
85 | return AllowTemplates; | ||||
86 | |||||
87 | bool IsType = isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND); | ||||
88 | if (!IsType) | ||||
89 | return false; | ||||
90 | |||||
91 | if (AllowNonTemplates) | ||||
92 | return true; | ||||
93 | |||||
94 | // An injected-class-name of a class template (specialization) is valid | ||||
95 | // as a template or as a non-template. | ||||
96 | if (AllowTemplates) { | ||||
97 | auto *RD = dyn_cast<CXXRecordDecl>(ND); | ||||
98 | if (!RD || !RD->isInjectedClassName()) | ||||
99 | return false; | ||||
100 | RD = cast<CXXRecordDecl>(RD->getDeclContext()); | ||||
101 | return RD->getDescribedClassTemplate() || | ||||
102 | isa<ClassTemplateSpecializationDecl>(RD); | ||||
103 | } | ||||
104 | |||||
105 | return false; | ||||
106 | } | ||||
107 | |||||
108 | return !WantClassName && candidate.isKeyword(); | ||||
109 | } | ||||
110 | |||||
111 | std::unique_ptr<CorrectionCandidateCallback> clone() override { | ||||
112 | return std::make_unique<TypeNameValidatorCCC>(*this); | ||||
113 | } | ||||
114 | |||||
115 | private: | ||||
116 | bool AllowInvalidDecl; | ||||
117 | bool WantClassName; | ||||
118 | bool AllowTemplates; | ||||
119 | bool AllowNonTemplates; | ||||
120 | }; | ||||
121 | |||||
122 | } // end anonymous namespace | ||||
123 | |||||
124 | /// Determine whether the token kind starts a simple-type-specifier. | ||||
125 | bool Sema::isSimpleTypeSpecifier(tok::TokenKind Kind) const { | ||||
126 | switch (Kind) { | ||||
127 | // FIXME: Take into account the current language when deciding whether a | ||||
128 | // token kind is a valid type specifier | ||||
129 | case tok::kw_short: | ||||
130 | case tok::kw_long: | ||||
131 | case tok::kw___int64: | ||||
132 | case tok::kw___int128: | ||||
133 | case tok::kw_signed: | ||||
134 | case tok::kw_unsigned: | ||||
135 | case tok::kw_void: | ||||
136 | case tok::kw_char: | ||||
137 | case tok::kw_int: | ||||
138 | case tok::kw_half: | ||||
139 | case tok::kw_float: | ||||
140 | case tok::kw_double: | ||||
141 | case tok::kw___bf16: | ||||
142 | case tok::kw__Float16: | ||||
143 | case tok::kw___float128: | ||||
144 | case tok::kw_wchar_t: | ||||
145 | case tok::kw_bool: | ||||
146 | case tok::kw___underlying_type: | ||||
147 | case tok::kw___auto_type: | ||||
148 | return true; | ||||
149 | |||||
150 | case tok::annot_typename: | ||||
151 | case tok::kw_char16_t: | ||||
152 | case tok::kw_char32_t: | ||||
153 | case tok::kw_typeof: | ||||
154 | case tok::annot_decltype: | ||||
155 | case tok::kw_decltype: | ||||
156 | return getLangOpts().CPlusPlus; | ||||
157 | |||||
158 | case tok::kw_char8_t: | ||||
159 | return getLangOpts().Char8; | ||||
160 | |||||
161 | default: | ||||
162 | break; | ||||
163 | } | ||||
164 | |||||
165 | return false; | ||||
166 | } | ||||
167 | |||||
168 | namespace { | ||||
169 | enum class UnqualifiedTypeNameLookupResult { | ||||
170 | NotFound, | ||||
171 | FoundNonType, | ||||
172 | FoundType | ||||
173 | }; | ||||
174 | } // end anonymous namespace | ||||
175 | |||||
176 | /// Tries to perform unqualified lookup of the type decls in bases for | ||||
177 | /// dependent class. | ||||
178 | /// \return \a NotFound if no any decls is found, \a FoundNotType if found not a | ||||
179 | /// type decl, \a FoundType if only type decls are found. | ||||
180 | static UnqualifiedTypeNameLookupResult | ||||
181 | lookupUnqualifiedTypeNameInBase(Sema &S, const IdentifierInfo &II, | ||||
182 | SourceLocation NameLoc, | ||||
183 | const CXXRecordDecl *RD) { | ||||
184 | if (!RD->hasDefinition()) | ||||
185 | return UnqualifiedTypeNameLookupResult::NotFound; | ||||
186 | // Look for type decls in base classes. | ||||
187 | UnqualifiedTypeNameLookupResult FoundTypeDecl = | ||||
188 | UnqualifiedTypeNameLookupResult::NotFound; | ||||
189 | for (const auto &Base : RD->bases()) { | ||||
190 | const CXXRecordDecl *BaseRD = nullptr; | ||||
191 | if (auto *BaseTT = Base.getType()->getAs<TagType>()) | ||||
192 | BaseRD = BaseTT->getAsCXXRecordDecl(); | ||||
193 | else if (auto *TST = Base.getType()->getAs<TemplateSpecializationType>()) { | ||||
194 | // Look for type decls in dependent base classes that have known primary | ||||
195 | // templates. | ||||
196 | if (!TST || !TST->isDependentType()) | ||||
197 | continue; | ||||
198 | auto *TD = TST->getTemplateName().getAsTemplateDecl(); | ||||
199 | if (!TD) | ||||
200 | continue; | ||||
201 | if (auto *BasePrimaryTemplate = | ||||
202 | dyn_cast_or_null<CXXRecordDecl>(TD->getTemplatedDecl())) { | ||||
203 | if (BasePrimaryTemplate->getCanonicalDecl() != RD->getCanonicalDecl()) | ||||
204 | BaseRD = BasePrimaryTemplate; | ||||
205 | else if (auto *CTD = dyn_cast<ClassTemplateDecl>(TD)) { | ||||
206 | if (const ClassTemplatePartialSpecializationDecl *PS = | ||||
207 | CTD->findPartialSpecialization(Base.getType())) | ||||
208 | if (PS->getCanonicalDecl() != RD->getCanonicalDecl()) | ||||
209 | BaseRD = PS; | ||||
210 | } | ||||
211 | } | ||||
212 | } | ||||
213 | if (BaseRD) { | ||||
214 | for (NamedDecl *ND : BaseRD->lookup(&II)) { | ||||
215 | if (!isa<TypeDecl>(ND)) | ||||
216 | return UnqualifiedTypeNameLookupResult::FoundNonType; | ||||
217 | FoundTypeDecl = UnqualifiedTypeNameLookupResult::FoundType; | ||||
218 | } | ||||
219 | if (FoundTypeDecl == UnqualifiedTypeNameLookupResult::NotFound) { | ||||
220 | switch (lookupUnqualifiedTypeNameInBase(S, II, NameLoc, BaseRD)) { | ||||
221 | case UnqualifiedTypeNameLookupResult::FoundNonType: | ||||
222 | return UnqualifiedTypeNameLookupResult::FoundNonType; | ||||
223 | case UnqualifiedTypeNameLookupResult::FoundType: | ||||
224 | FoundTypeDecl = UnqualifiedTypeNameLookupResult::FoundType; | ||||
225 | break; | ||||
226 | case UnqualifiedTypeNameLookupResult::NotFound: | ||||
227 | break; | ||||
228 | } | ||||
229 | } | ||||
230 | } | ||||
231 | } | ||||
232 | |||||
233 | return FoundTypeDecl; | ||||
234 | } | ||||
235 | |||||
236 | static ParsedType recoverFromTypeInKnownDependentBase(Sema &S, | ||||
237 | const IdentifierInfo &II, | ||||
238 | SourceLocation NameLoc) { | ||||
239 | // Lookup in the parent class template context, if any. | ||||
240 | const CXXRecordDecl *RD = nullptr; | ||||
241 | UnqualifiedTypeNameLookupResult FoundTypeDecl = | ||||
242 | UnqualifiedTypeNameLookupResult::NotFound; | ||||
243 | for (DeclContext *DC = S.CurContext; | ||||
244 | DC && FoundTypeDecl == UnqualifiedTypeNameLookupResult::NotFound; | ||||
245 | DC = DC->getParent()) { | ||||
246 | // Look for type decls in dependent base classes that have known primary | ||||
247 | // templates. | ||||
248 | RD = dyn_cast<CXXRecordDecl>(DC); | ||||
249 | if (RD && RD->getDescribedClassTemplate()) | ||||
250 | FoundTypeDecl = lookupUnqualifiedTypeNameInBase(S, II, NameLoc, RD); | ||||
251 | } | ||||
252 | if (FoundTypeDecl != UnqualifiedTypeNameLookupResult::FoundType) | ||||
253 | return nullptr; | ||||
254 | |||||
255 | // We found some types in dependent base classes. Recover as if the user | ||||
256 | // wrote 'typename MyClass::II' instead of 'II'. We'll fully resolve the | ||||
257 | // lookup during template instantiation. | ||||
258 | S.Diag(NameLoc, diag::ext_found_in_dependent_base) << &II; | ||||
259 | |||||
260 | ASTContext &Context = S.Context; | ||||
261 | auto *NNS = NestedNameSpecifier::Create(Context, nullptr, false, | ||||
262 | cast<Type>(Context.getRecordType(RD))); | ||||
263 | QualType T = Context.getDependentNameType(ETK_Typename, NNS, &II); | ||||
264 | |||||
265 | CXXScopeSpec SS; | ||||
266 | SS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); | ||||
267 | |||||
268 | TypeLocBuilder Builder; | ||||
269 | DependentNameTypeLoc DepTL = Builder.push<DependentNameTypeLoc>(T); | ||||
270 | DepTL.setNameLoc(NameLoc); | ||||
271 | DepTL.setElaboratedKeywordLoc(SourceLocation()); | ||||
272 | DepTL.setQualifierLoc(SS.getWithLocInContext(Context)); | ||||
273 | return S.CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); | ||||
274 | } | ||||
275 | |||||
276 | /// If the identifier refers to a type name within this scope, | ||||
277 | /// return the declaration of that type. | ||||
278 | /// | ||||
279 | /// This routine performs ordinary name lookup of the identifier II | ||||
280 | /// within the given scope, with optional C++ scope specifier SS, to | ||||
281 | /// determine whether the name refers to a type. If so, returns an | ||||
282 | /// opaque pointer (actually a QualType) corresponding to that | ||||
283 | /// type. Otherwise, returns NULL. | ||||
284 | ParsedType Sema::getTypeName(const IdentifierInfo &II, SourceLocation NameLoc, | ||||
285 | Scope *S, CXXScopeSpec *SS, | ||||
286 | bool isClassName, bool HasTrailingDot, | ||||
287 | ParsedType ObjectTypePtr, | ||||
288 | bool IsCtorOrDtorName, | ||||
289 | bool WantNontrivialTypeSourceInfo, | ||||
290 | bool IsClassTemplateDeductionContext, | ||||
291 | IdentifierInfo **CorrectedII) { | ||||
292 | // FIXME: Consider allowing this outside C++1z mode as an extension. | ||||
293 | bool AllowDeducedTemplate = IsClassTemplateDeductionContext && | ||||
294 | getLangOpts().CPlusPlus17 && !IsCtorOrDtorName && | ||||
295 | !isClassName && !HasTrailingDot; | ||||
296 | |||||
297 | // Determine where we will perform name lookup. | ||||
298 | DeclContext *LookupCtx = nullptr; | ||||
299 | if (ObjectTypePtr) { | ||||
300 | QualType ObjectType = ObjectTypePtr.get(); | ||||
301 | if (ObjectType->isRecordType()) | ||||
302 | LookupCtx = computeDeclContext(ObjectType); | ||||
303 | } else if (SS && SS->isNotEmpty()) { | ||||
304 | LookupCtx = computeDeclContext(*SS, false); | ||||
305 | |||||
306 | if (!LookupCtx) { | ||||
307 | if (isDependentScopeSpecifier(*SS)) { | ||||
308 | // C++ [temp.res]p3: | ||||
309 | // A qualified-id that refers to a type and in which the | ||||
310 | // nested-name-specifier depends on a template-parameter (14.6.2) | ||||
311 | // shall be prefixed by the keyword typename to indicate that the | ||||
312 | // qualified-id denotes a type, forming an | ||||
313 | // elaborated-type-specifier (7.1.5.3). | ||||
314 | // | ||||
315 | // We therefore do not perform any name lookup if the result would | ||||
316 | // refer to a member of an unknown specialization. | ||||
317 | if (!isClassName && !IsCtorOrDtorName) | ||||
318 | return nullptr; | ||||
319 | |||||
320 | // We know from the grammar that this name refers to a type, | ||||
321 | // so build a dependent node to describe the type. | ||||
322 | if (WantNontrivialTypeSourceInfo) | ||||
323 | return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); | ||||
324 | |||||
325 | NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); | ||||
326 | QualType T = CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, | ||||
327 | II, NameLoc); | ||||
328 | return ParsedType::make(T); | ||||
329 | } | ||||
330 | |||||
331 | return nullptr; | ||||
332 | } | ||||
333 | |||||
334 | if (!LookupCtx->isDependentContext() && | ||||
335 | RequireCompleteDeclContext(*SS, LookupCtx)) | ||||
336 | return nullptr; | ||||
337 | } | ||||
338 | |||||
339 | // FIXME: LookupNestedNameSpecifierName isn't the right kind of | ||||
340 | // lookup for class-names. | ||||
341 | LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : | ||||
342 | LookupOrdinaryName; | ||||
343 | LookupResult Result(*this, &II, NameLoc, Kind); | ||||
344 | if (LookupCtx) { | ||||
345 | // Perform "qualified" name lookup into the declaration context we | ||||
346 | // computed, which is either the type of the base of a member access | ||||
347 | // expression or the declaration context associated with a prior | ||||
348 | // nested-name-specifier. | ||||
349 | LookupQualifiedName(Result, LookupCtx); | ||||
350 | |||||
351 | if (ObjectTypePtr && Result.empty()) { | ||||
352 | // C++ [basic.lookup.classref]p3: | ||||
353 | // If the unqualified-id is ~type-name, the type-name is looked up | ||||
354 | // in the context of the entire postfix-expression. If the type T of | ||||
355 | // the object expression is of a class type C, the type-name is also | ||||
356 | // looked up in the scope of class C. At least one of the lookups shall | ||||
357 | // find a name that refers to (possibly cv-qualified) T. | ||||
358 | LookupName(Result, S); | ||||
359 | } | ||||
360 | } else { | ||||
361 | // Perform unqualified name lookup. | ||||
362 | LookupName(Result, S); | ||||
363 | |||||
364 | // For unqualified lookup in a class template in MSVC mode, look into | ||||
365 | // dependent base classes where the primary class template is known. | ||||
366 | if (Result.empty() && getLangOpts().MSVCCompat && (!SS || SS->isEmpty())) { | ||||
367 | if (ParsedType TypeInBase = | ||||
368 | recoverFromTypeInKnownDependentBase(*this, II, NameLoc)) | ||||
369 | return TypeInBase; | ||||
370 | } | ||||
371 | } | ||||
372 | |||||
373 | NamedDecl *IIDecl = nullptr; | ||||
374 | switch (Result.getResultKind()) { | ||||
375 | case LookupResult::NotFound: | ||||
376 | case LookupResult::NotFoundInCurrentInstantiation: | ||||
377 | if (CorrectedII) { | ||||
378 | TypeNameValidatorCCC CCC(/*AllowInvalid=*/true, isClassName, | ||||
379 | AllowDeducedTemplate); | ||||
380 | TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), Kind, | ||||
381 | S, SS, CCC, CTK_ErrorRecovery); | ||||
382 | IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); | ||||
383 | TemplateTy Template; | ||||
384 | bool MemberOfUnknownSpecialization; | ||||
385 | UnqualifiedId TemplateName; | ||||
386 | TemplateName.setIdentifier(NewII, NameLoc); | ||||
387 | NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); | ||||
388 | CXXScopeSpec NewSS, *NewSSPtr = SS; | ||||
389 | if (SS && NNS) { | ||||
390 | NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); | ||||
391 | NewSSPtr = &NewSS; | ||||
392 | } | ||||
393 | if (Correction && (NNS || NewII != &II) && | ||||
394 | // Ignore a correction to a template type as the to-be-corrected | ||||
395 | // identifier is not a template (typo correction for template names | ||||
396 | // is handled elsewhere). | ||||
397 | !(getLangOpts().CPlusPlus && NewSSPtr && | ||||
398 | isTemplateName(S, *NewSSPtr, false, TemplateName, nullptr, false, | ||||
399 | Template, MemberOfUnknownSpecialization))) { | ||||
400 | ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, | ||||
401 | isClassName, HasTrailingDot, ObjectTypePtr, | ||||
402 | IsCtorOrDtorName, | ||||
403 | WantNontrivialTypeSourceInfo, | ||||
404 | IsClassTemplateDeductionContext); | ||||
405 | if (Ty) { | ||||
406 | diagnoseTypo(Correction, | ||||
407 | PDiag(diag::err_unknown_type_or_class_name_suggest) | ||||
408 | << Result.getLookupName() << isClassName); | ||||
409 | if (SS && NNS) | ||||
410 | SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); | ||||
411 | *CorrectedII = NewII; | ||||
412 | return Ty; | ||||
413 | } | ||||
414 | } | ||||
415 | } | ||||
416 | // If typo correction failed or was not performed, fall through | ||||
417 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||
418 | case LookupResult::FoundOverloaded: | ||||
419 | case LookupResult::FoundUnresolvedValue: | ||||
420 | Result.suppressDiagnostics(); | ||||
421 | return nullptr; | ||||
422 | |||||
423 | case LookupResult::Ambiguous: | ||||
424 | // Recover from type-hiding ambiguities by hiding the type. We'll | ||||
425 | // do the lookup again when looking for an object, and we can | ||||
426 | // diagnose the error then. If we don't do this, then the error | ||||
427 | // about hiding the type will be immediately followed by an error | ||||
428 | // that only makes sense if the identifier was treated like a type. | ||||
429 | if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { | ||||
430 | Result.suppressDiagnostics(); | ||||
431 | return nullptr; | ||||
432 | } | ||||
433 | |||||
434 | // Look to see if we have a type anywhere in the list of results. | ||||
435 | for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); | ||||
436 | Res != ResEnd; ++Res) { | ||||
437 | if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res) || | ||||
438 | (AllowDeducedTemplate && getAsTypeTemplateDecl(*Res))) { | ||||
439 | if (!IIDecl || (*Res)->getLocation() < IIDecl->getLocation()) | ||||
440 | IIDecl = *Res; | ||||
441 | } | ||||
442 | } | ||||
443 | |||||
444 | if (!IIDecl) { | ||||
445 | // None of the entities we found is a type, so there is no way | ||||
446 | // to even assume that the result is a type. In this case, don't | ||||
447 | // complain about the ambiguity. The parser will either try to | ||||
448 | // perform this lookup again (e.g., as an object name), which | ||||
449 | // will produce the ambiguity, or will complain that it expected | ||||
450 | // a type name. | ||||
451 | Result.suppressDiagnostics(); | ||||
452 | return nullptr; | ||||
453 | } | ||||
454 | |||||
455 | // We found a type within the ambiguous lookup; diagnose the | ||||
456 | // ambiguity and then return that type. This might be the right | ||||
457 | // answer, or it might not be, but it suppresses any attempt to | ||||
458 | // perform the name lookup again. | ||||
459 | break; | ||||
460 | |||||
461 | case LookupResult::Found: | ||||
462 | IIDecl = Result.getFoundDecl(); | ||||
463 | break; | ||||
464 | } | ||||
465 | |||||
466 | assert(IIDecl && "Didn't find decl")((IIDecl && "Didn't find decl") ? static_cast<void > (0) : __assert_fail ("IIDecl && \"Didn't find decl\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 466, __PRETTY_FUNCTION__)); | ||||
467 | |||||
468 | QualType T; | ||||
469 | if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { | ||||
470 | // C++ [class.qual]p2: A lookup that would find the injected-class-name | ||||
471 | // instead names the constructors of the class, except when naming a class. | ||||
472 | // This is ill-formed when we're not actually forming a ctor or dtor name. | ||||
473 | auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(LookupCtx); | ||||
474 | auto *FoundRD = dyn_cast<CXXRecordDecl>(TD); | ||||
475 | if (!isClassName && !IsCtorOrDtorName && LookupRD && FoundRD && | ||||
476 | FoundRD->isInjectedClassName() && | ||||
477 | declaresSameEntity(LookupRD, cast<Decl>(FoundRD->getParent()))) | ||||
478 | Diag(NameLoc, diag::err_out_of_line_qualified_id_type_names_constructor) | ||||
479 | << &II << /*Type*/1; | ||||
480 | |||||
481 | DiagnoseUseOfDecl(IIDecl, NameLoc); | ||||
482 | |||||
483 | T = Context.getTypeDeclType(TD); | ||||
484 | MarkAnyDeclReferenced(TD->getLocation(), TD, /*OdrUse=*/false); | ||||
485 | } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { | ||||
486 | (void)DiagnoseUseOfDecl(IDecl, NameLoc); | ||||
487 | if (!HasTrailingDot) | ||||
488 | T = Context.getObjCInterfaceType(IDecl); | ||||
489 | } else if (AllowDeducedTemplate) { | ||||
490 | if (auto *TD = getAsTypeTemplateDecl(IIDecl)) | ||||
491 | T = Context.getDeducedTemplateSpecializationType(TemplateName(TD), | ||||
492 | QualType(), false); | ||||
493 | } | ||||
494 | |||||
495 | if (T.isNull()) { | ||||
496 | // If it's not plausibly a type, suppress diagnostics. | ||||
497 | Result.suppressDiagnostics(); | ||||
498 | return nullptr; | ||||
499 | } | ||||
500 | |||||
501 | // NOTE: avoid constructing an ElaboratedType(Loc) if this is a | ||||
502 | // constructor or destructor name (in such a case, the scope specifier | ||||
503 | // will be attached to the enclosing Expr or Decl node). | ||||
504 | if (SS && SS->isNotEmpty() && !IsCtorOrDtorName && | ||||
505 | !isa<ObjCInterfaceDecl>(IIDecl)) { | ||||
506 | if (WantNontrivialTypeSourceInfo) { | ||||
507 | // Construct a type with type-source information. | ||||
508 | TypeLocBuilder Builder; | ||||
509 | Builder.pushTypeSpec(T).setNameLoc(NameLoc); | ||||
510 | |||||
511 | T = getElaboratedType(ETK_None, *SS, T); | ||||
512 | ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); | ||||
513 | ElabTL.setElaboratedKeywordLoc(SourceLocation()); | ||||
514 | ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); | ||||
515 | return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); | ||||
516 | } else { | ||||
517 | T = getElaboratedType(ETK_None, *SS, T); | ||||
518 | } | ||||
519 | } | ||||
520 | |||||
521 | return ParsedType::make(T); | ||||
522 | } | ||||
523 | |||||
524 | // Builds a fake NNS for the given decl context. | ||||
525 | static NestedNameSpecifier * | ||||
526 | synthesizeCurrentNestedNameSpecifier(ASTContext &Context, DeclContext *DC) { | ||||
527 | for (;; DC = DC->getLookupParent()) { | ||||
528 | DC = DC->getPrimaryContext(); | ||||
529 | auto *ND = dyn_cast<NamespaceDecl>(DC); | ||||
530 | if (ND && !ND->isInline() && !ND->isAnonymousNamespace()) | ||||
531 | return NestedNameSpecifier::Create(Context, nullptr, ND); | ||||
532 | else if (auto *RD = dyn_cast<CXXRecordDecl>(DC)) | ||||
533 | return NestedNameSpecifier::Create(Context, nullptr, RD->isTemplateDecl(), | ||||
534 | RD->getTypeForDecl()); | ||||
535 | else if (isa<TranslationUnitDecl>(DC)) | ||||
536 | return NestedNameSpecifier::GlobalSpecifier(Context); | ||||
537 | } | ||||
538 | llvm_unreachable("something isn't in TU scope?")::llvm::llvm_unreachable_internal("something isn't in TU scope?" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 538); | ||||
539 | } | ||||
540 | |||||
541 | /// Find the parent class with dependent bases of the innermost enclosing method | ||||
542 | /// context. Do not look for enclosing CXXRecordDecls directly, or we will end | ||||
543 | /// up allowing unqualified dependent type names at class-level, which MSVC | ||||
544 | /// correctly rejects. | ||||
545 | static const CXXRecordDecl * | ||||
546 | findRecordWithDependentBasesOfEnclosingMethod(const DeclContext *DC) { | ||||
547 | for (; DC && DC->isDependentContext(); DC = DC->getLookupParent()) { | ||||
548 | DC = DC->getPrimaryContext(); | ||||
549 | if (const auto *MD = dyn_cast<CXXMethodDecl>(DC)) | ||||
550 | if (MD->getParent()->hasAnyDependentBases()) | ||||
551 | return MD->getParent(); | ||||
552 | } | ||||
553 | return nullptr; | ||||
554 | } | ||||
555 | |||||
556 | ParsedType Sema::ActOnMSVCUnknownTypeName(const IdentifierInfo &II, | ||||
557 | SourceLocation NameLoc, | ||||
558 | bool IsTemplateTypeArg) { | ||||
559 | assert(getLangOpts().MSVCCompat && "shouldn't be called in non-MSVC mode")((getLangOpts().MSVCCompat && "shouldn't be called in non-MSVC mode" ) ? static_cast<void> (0) : __assert_fail ("getLangOpts().MSVCCompat && \"shouldn't be called in non-MSVC mode\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 559, __PRETTY_FUNCTION__)); | ||||
560 | |||||
561 | NestedNameSpecifier *NNS = nullptr; | ||||
562 | if (IsTemplateTypeArg && getCurScope()->isTemplateParamScope()) { | ||||
563 | // If we weren't able to parse a default template argument, delay lookup | ||||
564 | // until instantiation time by making a non-dependent DependentTypeName. We | ||||
565 | // pretend we saw a NestedNameSpecifier referring to the current scope, and | ||||
566 | // lookup is retried. | ||||
567 | // FIXME: This hurts our diagnostic quality, since we get errors like "no | ||||
568 | // type named 'Foo' in 'current_namespace'" when the user didn't write any | ||||
569 | // name specifiers. | ||||
570 | NNS = synthesizeCurrentNestedNameSpecifier(Context, CurContext); | ||||
571 | Diag(NameLoc, diag::ext_ms_delayed_template_argument) << &II; | ||||
572 | } else if (const CXXRecordDecl *RD = | ||||
573 | findRecordWithDependentBasesOfEnclosingMethod(CurContext)) { | ||||
574 | // Build a DependentNameType that will perform lookup into RD at | ||||
575 | // instantiation time. | ||||
576 | NNS = NestedNameSpecifier::Create(Context, nullptr, RD->isTemplateDecl(), | ||||
577 | RD->getTypeForDecl()); | ||||
578 | |||||
579 | // Diagnose that this identifier was undeclared, and retry the lookup during | ||||
580 | // template instantiation. | ||||
581 | Diag(NameLoc, diag::ext_undeclared_unqual_id_with_dependent_base) << &II | ||||
582 | << RD; | ||||
583 | } else { | ||||
584 | // This is not a situation that we should recover from. | ||||
585 | return ParsedType(); | ||||
586 | } | ||||
587 | |||||
588 | QualType T = Context.getDependentNameType(ETK_None, NNS, &II); | ||||
589 | |||||
590 | // Build type location information. We synthesized the qualifier, so we have | ||||
591 | // to build a fake NestedNameSpecifierLoc. | ||||
592 | NestedNameSpecifierLocBuilder NNSLocBuilder; | ||||
593 | NNSLocBuilder.MakeTrivial(Context, NNS, SourceRange(NameLoc)); | ||||
594 | NestedNameSpecifierLoc QualifierLoc = NNSLocBuilder.getWithLocInContext(Context); | ||||
595 | |||||
596 | TypeLocBuilder Builder; | ||||
597 | DependentNameTypeLoc DepTL = Builder.push<DependentNameTypeLoc>(T); | ||||
598 | DepTL.setNameLoc(NameLoc); | ||||
599 | DepTL.setElaboratedKeywordLoc(SourceLocation()); | ||||
600 | DepTL.setQualifierLoc(QualifierLoc); | ||||
601 | return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); | ||||
602 | } | ||||
603 | |||||
604 | /// isTagName() - This method is called *for error recovery purposes only* | ||||
605 | /// to determine if the specified name is a valid tag name ("struct foo"). If | ||||
606 | /// so, this returns the TST for the tag corresponding to it (TST_enum, | ||||
607 | /// TST_union, TST_struct, TST_interface, TST_class). This is used to diagnose | ||||
608 | /// cases in C where the user forgot to specify the tag. | ||||
609 | DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { | ||||
610 | // Do a tag name lookup in this scope. | ||||
611 | LookupResult R(*this, &II, SourceLocation(), LookupTagName); | ||||
612 | LookupName(R, S, false); | ||||
613 | R.suppressDiagnostics(); | ||||
614 | if (R.getResultKind() == LookupResult::Found) | ||||
615 | if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { | ||||
616 | switch (TD->getTagKind()) { | ||||
617 | case TTK_Struct: return DeclSpec::TST_struct; | ||||
618 | case TTK_Interface: return DeclSpec::TST_interface; | ||||
619 | case TTK_Union: return DeclSpec::TST_union; | ||||
620 | case TTK_Class: return DeclSpec::TST_class; | ||||
621 | case TTK_Enum: return DeclSpec::TST_enum; | ||||
622 | } | ||||
623 | } | ||||
624 | |||||
625 | return DeclSpec::TST_unspecified; | ||||
626 | } | ||||
627 | |||||
628 | /// isMicrosoftMissingTypename - In Microsoft mode, within class scope, | ||||
629 | /// if a CXXScopeSpec's type is equal to the type of one of the base classes | ||||
630 | /// then downgrade the missing typename error to a warning. | ||||
631 | /// This is needed for MSVC compatibility; Example: | ||||
632 | /// @code | ||||
633 | /// template<class T> class A { | ||||
634 | /// public: | ||||
635 | /// typedef int TYPE; | ||||
636 | /// }; | ||||
637 | /// template<class T> class B : public A<T> { | ||||
638 | /// public: | ||||
639 | /// A<T>::TYPE a; // no typename required because A<T> is a base class. | ||||
640 | /// }; | ||||
641 | /// @endcode | ||||
642 | bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { | ||||
643 | if (CurContext->isRecord()) { | ||||
644 | if (SS->getScopeRep()->getKind() == NestedNameSpecifier::Super) | ||||
645 | return true; | ||||
646 | |||||
647 | const Type *Ty = SS->getScopeRep()->getAsType(); | ||||
648 | |||||
649 | CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); | ||||
650 | for (const auto &Base : RD->bases()) | ||||
651 | if (Ty && Context.hasSameUnqualifiedType(QualType(Ty, 1), Base.getType())) | ||||
652 | return true; | ||||
653 | return S->isFunctionPrototypeScope(); | ||||
654 | } | ||||
655 | return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); | ||||
656 | } | ||||
657 | |||||
658 | void Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II, | ||||
659 | SourceLocation IILoc, | ||||
660 | Scope *S, | ||||
661 | CXXScopeSpec *SS, | ||||
662 | ParsedType &SuggestedType, | ||||
663 | bool IsTemplateName) { | ||||
664 | // Don't report typename errors for editor placeholders. | ||||
665 | if (II->isEditorPlaceholder()) | ||||
666 | return; | ||||
667 | // We don't have anything to suggest (yet). | ||||
668 | SuggestedType = nullptr; | ||||
669 | |||||
670 | // There may have been a typo in the name of the type. Look up typo | ||||
671 | // results, in case we have something that we can suggest. | ||||
672 | TypeNameValidatorCCC CCC(/*AllowInvalid=*/false, /*WantClass=*/false, | ||||
673 | /*AllowTemplates=*/IsTemplateName, | ||||
674 | /*AllowNonTemplates=*/!IsTemplateName); | ||||
675 | if (TypoCorrection Corrected = | ||||
676 | CorrectTypo(DeclarationNameInfo(II, IILoc), LookupOrdinaryName, S, SS, | ||||
677 | CCC, CTK_ErrorRecovery)) { | ||||
678 | // FIXME: Support error recovery for the template-name case. | ||||
679 | bool CanRecover = !IsTemplateName; | ||||
680 | if (Corrected.isKeyword()) { | ||||
681 | // We corrected to a keyword. | ||||
682 | diagnoseTypo(Corrected, | ||||
683 | PDiag(IsTemplateName ? diag::err_no_template_suggest | ||||
684 | : diag::err_unknown_typename_suggest) | ||||
685 | << II); | ||||
686 | II = Corrected.getCorrectionAsIdentifierInfo(); | ||||
687 | } else { | ||||
688 | // We found a similarly-named type or interface; suggest that. | ||||
689 | if (!SS || !SS->isSet()) { | ||||
690 | diagnoseTypo(Corrected, | ||||
691 | PDiag(IsTemplateName ? diag::err_no_template_suggest | ||||
692 | : diag::err_unknown_typename_suggest) | ||||
693 | << II, CanRecover); | ||||
694 | } else if (DeclContext *DC = computeDeclContext(*SS, false)) { | ||||
695 | std::string CorrectedStr(Corrected.getAsString(getLangOpts())); | ||||
696 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && | ||||
697 | II->getName().equals(CorrectedStr); | ||||
698 | diagnoseTypo(Corrected, | ||||
699 | PDiag(IsTemplateName | ||||
700 | ? diag::err_no_member_template_suggest | ||||
701 | : diag::err_unknown_nested_typename_suggest) | ||||
702 | << II << DC << DroppedSpecifier << SS->getRange(), | ||||
703 | CanRecover); | ||||
704 | } else { | ||||
705 | llvm_unreachable("could not have corrected a typo here")::llvm::llvm_unreachable_internal("could not have corrected a typo here" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 705); | ||||
706 | } | ||||
707 | |||||
708 | if (!CanRecover) | ||||
709 | return; | ||||
710 | |||||
711 | CXXScopeSpec tmpSS; | ||||
712 | if (Corrected.getCorrectionSpecifier()) | ||||
713 | tmpSS.MakeTrivial(Context, Corrected.getCorrectionSpecifier(), | ||||
714 | SourceRange(IILoc)); | ||||
715 | // FIXME: Support class template argument deduction here. | ||||
716 | SuggestedType = | ||||
717 | getTypeName(*Corrected.getCorrectionAsIdentifierInfo(), IILoc, S, | ||||
718 | tmpSS.isSet() ? &tmpSS : SS, false, false, nullptr, | ||||
719 | /*IsCtorOrDtorName=*/false, | ||||
720 | /*WantNontrivialTypeSourceInfo=*/true); | ||||
721 | } | ||||
722 | return; | ||||
723 | } | ||||
724 | |||||
725 | if (getLangOpts().CPlusPlus && !IsTemplateName) { | ||||
726 | // See if II is a class template that the user forgot to pass arguments to. | ||||
727 | UnqualifiedId Name; | ||||
728 | Name.setIdentifier(II, IILoc); | ||||
729 | CXXScopeSpec EmptySS; | ||||
730 | TemplateTy TemplateResult; | ||||
731 | bool MemberOfUnknownSpecialization; | ||||
732 | if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, | ||||
733 | Name, nullptr, true, TemplateResult, | ||||
734 | MemberOfUnknownSpecialization) == TNK_Type_template) { | ||||
735 | diagnoseMissingTemplateArguments(TemplateResult.get(), IILoc); | ||||
736 | return; | ||||
737 | } | ||||
738 | } | ||||
739 | |||||
740 | // FIXME: Should we move the logic that tries to recover from a missing tag | ||||
741 | // (struct, union, enum) from Parser::ParseImplicitInt here, instead? | ||||
742 | |||||
743 | if (!SS || (!SS->isSet() && !SS->isInvalid())) | ||||
744 | Diag(IILoc, IsTemplateName ? diag::err_no_template | ||||
745 | : diag::err_unknown_typename) | ||||
746 | << II; | ||||
747 | else if (DeclContext *DC = computeDeclContext(*SS, false)) | ||||
748 | Diag(IILoc, IsTemplateName ? diag::err_no_member_template | ||||
749 | : diag::err_typename_nested_not_found) | ||||
750 | << II << DC << SS->getRange(); | ||||
751 | else if (SS->isValid() && SS->getScopeRep()->containsErrors()) { | ||||
752 | SuggestedType = | ||||
753 | ActOnTypenameType(S, SourceLocation(), *SS, *II, IILoc).get(); | ||||
754 | } else if (isDependentScopeSpecifier(*SS)) { | ||||
755 | unsigned DiagID = diag::err_typename_missing; | ||||
756 | if (getLangOpts().MSVCCompat && isMicrosoftMissingTypename(SS, S)) | ||||
757 | DiagID = diag::ext_typename_missing; | ||||
758 | |||||
759 | Diag(SS->getRange().getBegin(), DiagID) | ||||
760 | << SS->getScopeRep() << II->getName() | ||||
761 | << SourceRange(SS->getRange().getBegin(), IILoc) | ||||
762 | << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); | ||||
763 | SuggestedType = ActOnTypenameType(S, SourceLocation(), | ||||
764 | *SS, *II, IILoc).get(); | ||||
765 | } else { | ||||
766 | assert(SS && SS->isInvalid() &&((SS && SS->isInvalid() && "Invalid scope specifier has already been diagnosed" ) ? static_cast<void> (0) : __assert_fail ("SS && SS->isInvalid() && \"Invalid scope specifier has already been diagnosed\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 767, __PRETTY_FUNCTION__)) | ||||
767 | "Invalid scope specifier has already been diagnosed")((SS && SS->isInvalid() && "Invalid scope specifier has already been diagnosed" ) ? static_cast<void> (0) : __assert_fail ("SS && SS->isInvalid() && \"Invalid scope specifier has already been diagnosed\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 767, __PRETTY_FUNCTION__)); | ||||
768 | } | ||||
769 | } | ||||
770 | |||||
771 | /// Determine whether the given result set contains either a type name | ||||
772 | /// or | ||||
773 | static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { | ||||
774 | bool CheckTemplate = R.getSema().getLangOpts().CPlusPlus && | ||||
775 | NextToken.is(tok::less); | ||||
776 | |||||
777 | for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { | ||||
778 | if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) | ||||
779 | return true; | ||||
780 | |||||
781 | if (CheckTemplate && isa<TemplateDecl>(*I)) | ||||
782 | return true; | ||||
783 | } | ||||
784 | |||||
785 | return false; | ||||
786 | } | ||||
787 | |||||
788 | static bool isTagTypeWithMissingTag(Sema &SemaRef, LookupResult &Result, | ||||
789 | Scope *S, CXXScopeSpec &SS, | ||||
790 | IdentifierInfo *&Name, | ||||
791 | SourceLocation NameLoc) { | ||||
792 | LookupResult R(SemaRef, Name, NameLoc, Sema::LookupTagName); | ||||
793 | SemaRef.LookupParsedName(R, S, &SS); | ||||
794 | if (TagDecl *Tag = R.getAsSingle<TagDecl>()) { | ||||
795 | StringRef FixItTagName; | ||||
796 | switch (Tag->getTagKind()) { | ||||
797 | case TTK_Class: | ||||
798 | FixItTagName = "class "; | ||||
799 | break; | ||||
800 | |||||
801 | case TTK_Enum: | ||||
802 | FixItTagName = "enum "; | ||||
803 | break; | ||||
804 | |||||
805 | case TTK_Struct: | ||||
806 | FixItTagName = "struct "; | ||||
807 | break; | ||||
808 | |||||
809 | case TTK_Interface: | ||||
810 | FixItTagName = "__interface "; | ||||
811 | break; | ||||
812 | |||||
813 | case TTK_Union: | ||||
814 | FixItTagName = "union "; | ||||
815 | break; | ||||
816 | } | ||||
817 | |||||
818 | StringRef TagName = FixItTagName.drop_back(); | ||||
819 | SemaRef.Diag(NameLoc, diag::err_use_of_tag_name_without_tag) | ||||
820 | << Name << TagName << SemaRef.getLangOpts().CPlusPlus | ||||
821 | << FixItHint::CreateInsertion(NameLoc, FixItTagName); | ||||
822 | |||||
823 | for (LookupResult::iterator I = Result.begin(), IEnd = Result.end(); | ||||
824 | I != IEnd; ++I) | ||||
825 | SemaRef.Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type) | ||||
826 | << Name << TagName; | ||||
827 | |||||
828 | // Replace lookup results with just the tag decl. | ||||
829 | Result.clear(Sema::LookupTagName); | ||||
830 | SemaRef.LookupParsedName(Result, S, &SS); | ||||
831 | return true; | ||||
832 | } | ||||
833 | |||||
834 | return false; | ||||
835 | } | ||||
836 | |||||
837 | /// Build a ParsedType for a simple-type-specifier with a nested-name-specifier. | ||||
838 | static ParsedType buildNestedType(Sema &S, CXXScopeSpec &SS, | ||||
839 | QualType T, SourceLocation NameLoc) { | ||||
840 | ASTContext &Context = S.Context; | ||||
841 | |||||
842 | TypeLocBuilder Builder; | ||||
843 | Builder.pushTypeSpec(T).setNameLoc(NameLoc); | ||||
844 | |||||
845 | T = S.getElaboratedType(ETK_None, SS, T); | ||||
846 | ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); | ||||
847 | ElabTL.setElaboratedKeywordLoc(SourceLocation()); | ||||
848 | ElabTL.setQualifierLoc(SS.getWithLocInContext(Context)); | ||||
849 | return S.CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); | ||||
850 | } | ||||
851 | |||||
852 | Sema::NameClassification Sema::ClassifyName(Scope *S, CXXScopeSpec &SS, | ||||
853 | IdentifierInfo *&Name, | ||||
854 | SourceLocation NameLoc, | ||||
855 | const Token &NextToken, | ||||
856 | CorrectionCandidateCallback *CCC) { | ||||
857 | DeclarationNameInfo NameInfo(Name, NameLoc); | ||||
858 | ObjCMethodDecl *CurMethod = getCurMethodDecl(); | ||||
859 | |||||
860 | assert(NextToken.isNot(tok::coloncolon) &&((NextToken.isNot(tok::coloncolon) && "parse nested name specifiers before calling ClassifyName" ) ? static_cast<void> (0) : __assert_fail ("NextToken.isNot(tok::coloncolon) && \"parse nested name specifiers before calling ClassifyName\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 861, __PRETTY_FUNCTION__)) | ||||
861 | "parse nested name specifiers before calling ClassifyName")((NextToken.isNot(tok::coloncolon) && "parse nested name specifiers before calling ClassifyName" ) ? static_cast<void> (0) : __assert_fail ("NextToken.isNot(tok::coloncolon) && \"parse nested name specifiers before calling ClassifyName\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 861, __PRETTY_FUNCTION__)); | ||||
862 | if (getLangOpts().CPlusPlus && SS.isSet() && | ||||
863 | isCurrentClassName(*Name, S, &SS)) { | ||||
864 | // Per [class.qual]p2, this names the constructors of SS, not the | ||||
865 | // injected-class-name. We don't have a classification for that. | ||||
866 | // There's not much point caching this result, since the parser | ||||
867 | // will reject it later. | ||||
868 | return NameClassification::Unknown(); | ||||
869 | } | ||||
870 | |||||
871 | LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); | ||||
872 | LookupParsedName(Result, S, &SS, !CurMethod); | ||||
873 | |||||
874 | if (SS.isInvalid()) | ||||
875 | return NameClassification::Error(); | ||||
876 | |||||
877 | // For unqualified lookup in a class template in MSVC mode, look into | ||||
878 | // dependent base classes where the primary class template is known. | ||||
879 | if (Result.empty() && SS.isEmpty() && getLangOpts().MSVCCompat) { | ||||
880 | if (ParsedType TypeInBase = | ||||
881 | recoverFromTypeInKnownDependentBase(*this, *Name, NameLoc)) | ||||
882 | return TypeInBase; | ||||
883 | } | ||||
884 | |||||
885 | // Perform lookup for Objective-C instance variables (including automatically | ||||
886 | // synthesized instance variables), if we're in an Objective-C method. | ||||
887 | // FIXME: This lookup really, really needs to be folded in to the normal | ||||
888 | // unqualified lookup mechanism. | ||||
889 | if (SS.isEmpty() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { | ||||
890 | DeclResult Ivar = LookupIvarInObjCMethod(Result, S, Name); | ||||
891 | if (Ivar.isInvalid()) | ||||
892 | return NameClassification::Error(); | ||||
893 | if (Ivar.isUsable()) | ||||
894 | return NameClassification::NonType(cast<NamedDecl>(Ivar.get())); | ||||
895 | |||||
896 | // We defer builtin creation until after ivar lookup inside ObjC methods. | ||||
897 | if (Result.empty()) | ||||
898 | LookupBuiltin(Result); | ||||
899 | } | ||||
900 | |||||
901 | bool SecondTry = false; | ||||
902 | bool IsFilteredTemplateName = false; | ||||
903 | |||||
904 | Corrected: | ||||
905 | switch (Result.getResultKind()) { | ||||
906 | case LookupResult::NotFound: | ||||
907 | // If an unqualified-id is followed by a '(', then we have a function | ||||
908 | // call. | ||||
909 | if (SS.isEmpty() && NextToken.is(tok::l_paren)) { | ||||
910 | // In C++, this is an ADL-only call. | ||||
911 | // FIXME: Reference? | ||||
912 | if (getLangOpts().CPlusPlus) | ||||
913 | return NameClassification::UndeclaredNonType(); | ||||
914 | |||||
915 | // C90 6.3.2.2: | ||||
916 | // If the expression that precedes the parenthesized argument list in a | ||||
917 | // function call consists solely of an identifier, and if no | ||||
918 | // declaration is visible for this identifier, the identifier is | ||||
919 | // implicitly declared exactly as if, in the innermost block containing | ||||
920 | // the function call, the declaration | ||||
921 | // | ||||
922 | // extern int identifier (); | ||||
923 | // | ||||
924 | // appeared. | ||||
925 | // | ||||
926 | // We also allow this in C99 as an extension. | ||||
927 | if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) | ||||
928 | return NameClassification::NonType(D); | ||||
929 | } | ||||
930 | |||||
931 | if (getLangOpts().CPlusPlus20 && SS.isEmpty() && NextToken.is(tok::less)) { | ||||
932 | // In C++20 onwards, this could be an ADL-only call to a function | ||||
933 | // template, and we're required to assume that this is a template name. | ||||
934 | // | ||||
935 | // FIXME: Find a way to still do typo correction in this case. | ||||
936 | TemplateName Template = | ||||
937 | Context.getAssumedTemplateName(NameInfo.getName()); | ||||
938 | return NameClassification::UndeclaredTemplate(Template); | ||||
939 | } | ||||
940 | |||||
941 | // In C, we first see whether there is a tag type by the same name, in | ||||
942 | // which case it's likely that the user just forgot to write "enum", | ||||
943 | // "struct", or "union". | ||||
944 | if (!getLangOpts().CPlusPlus && !SecondTry && | ||||
945 | isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) { | ||||
946 | break; | ||||
947 | } | ||||
948 | |||||
949 | // Perform typo correction to determine if there is another name that is | ||||
950 | // close to this name. | ||||
951 | if (!SecondTry && CCC) { | ||||
952 | SecondTry = true; | ||||
953 | if (TypoCorrection Corrected = | ||||
954 | CorrectTypo(Result.getLookupNameInfo(), Result.getLookupKind(), S, | ||||
955 | &SS, *CCC, CTK_ErrorRecovery)) { | ||||
956 | unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; | ||||
957 | unsigned QualifiedDiag = diag::err_no_member_suggest; | ||||
958 | |||||
959 | NamedDecl *FirstDecl = Corrected.getFoundDecl(); | ||||
960 | NamedDecl *UnderlyingFirstDecl = Corrected.getCorrectionDecl(); | ||||
961 | if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && | ||||
962 | UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { | ||||
963 | UnqualifiedDiag = diag::err_no_template_suggest; | ||||
964 | QualifiedDiag = diag::err_no_member_template_suggest; | ||||
965 | } else if (UnderlyingFirstDecl && | ||||
966 | (isa<TypeDecl>(UnderlyingFirstDecl) || | ||||
967 | isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || | ||||
968 | isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { | ||||
969 | UnqualifiedDiag = diag::err_unknown_typename_suggest; | ||||
970 | QualifiedDiag = diag::err_unknown_nested_typename_suggest; | ||||
971 | } | ||||
972 | |||||
973 | if (SS.isEmpty()) { | ||||
974 | diagnoseTypo(Corrected, PDiag(UnqualifiedDiag) << Name); | ||||
975 | } else {// FIXME: is this even reachable? Test it. | ||||
976 | std::string CorrectedStr(Corrected.getAsString(getLangOpts())); | ||||
977 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && | ||||
978 | Name->getName().equals(CorrectedStr); | ||||
979 | diagnoseTypo(Corrected, PDiag(QualifiedDiag) | ||||
980 | << Name << computeDeclContext(SS, false) | ||||
981 | << DroppedSpecifier << SS.getRange()); | ||||
982 | } | ||||
983 | |||||
984 | // Update the name, so that the caller has the new name. | ||||
985 | Name = Corrected.getCorrectionAsIdentifierInfo(); | ||||
986 | |||||
987 | // Typo correction corrected to a keyword. | ||||
988 | if (Corrected.isKeyword()) | ||||
989 | return Name; | ||||
990 | |||||
991 | // Also update the LookupResult... | ||||
992 | // FIXME: This should probably go away at some point | ||||
993 | Result.clear(); | ||||
994 | Result.setLookupName(Corrected.getCorrection()); | ||||
995 | if (FirstDecl) | ||||
996 | Result.addDecl(FirstDecl); | ||||
997 | |||||
998 | // If we found an Objective-C instance variable, let | ||||
999 | // LookupInObjCMethod build the appropriate expression to | ||||
1000 | // reference the ivar. | ||||
1001 | // FIXME: This is a gross hack. | ||||
1002 | if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { | ||||
1003 | DeclResult R = | ||||
1004 | LookupIvarInObjCMethod(Result, S, Ivar->getIdentifier()); | ||||
1005 | if (R.isInvalid()) | ||||
1006 | return NameClassification::Error(); | ||||
1007 | if (R.isUsable()) | ||||
1008 | return NameClassification::NonType(Ivar); | ||||
1009 | } | ||||
1010 | |||||
1011 | goto Corrected; | ||||
1012 | } | ||||
1013 | } | ||||
1014 | |||||
1015 | // We failed to correct; just fall through and let the parser deal with it. | ||||
1016 | Result.suppressDiagnostics(); | ||||
1017 | return NameClassification::Unknown(); | ||||
1018 | |||||
1019 | case LookupResult::NotFoundInCurrentInstantiation: { | ||||
1020 | // We performed name lookup into the current instantiation, and there were | ||||
1021 | // dependent bases, so we treat this result the same way as any other | ||||
1022 | // dependent nested-name-specifier. | ||||
1023 | |||||
1024 | // C++ [temp.res]p2: | ||||
1025 | // A name used in a template declaration or definition and that is | ||||
1026 | // dependent on a template-parameter is assumed not to name a type | ||||
1027 | // unless the applicable name lookup finds a type name or the name is | ||||
1028 | // qualified by the keyword typename. | ||||
1029 | // | ||||
1030 | // FIXME: If the next token is '<', we might want to ask the parser to | ||||
1031 | // perform some heroics to see if we actually have a | ||||
1032 | // template-argument-list, which would indicate a missing 'template' | ||||
1033 | // keyword here. | ||||
1034 | return NameClassification::DependentNonType(); | ||||
1035 | } | ||||
1036 | |||||
1037 | case LookupResult::Found: | ||||
1038 | case LookupResult::FoundOverloaded: | ||||
1039 | case LookupResult::FoundUnresolvedValue: | ||||
1040 | break; | ||||
1041 | |||||
1042 | case LookupResult::Ambiguous: | ||||
1043 | if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && | ||||
1044 | hasAnyAcceptableTemplateNames(Result, /*AllowFunctionTemplates=*/true, | ||||
1045 | /*AllowDependent=*/false)) { | ||||
1046 | // C++ [temp.local]p3: | ||||
1047 | // A lookup that finds an injected-class-name (10.2) can result in an | ||||
1048 | // ambiguity in certain cases (for example, if it is found in more than | ||||
1049 | // one base class). If all of the injected-class-names that are found | ||||
1050 | // refer to specializations of the same class template, and if the name | ||||
1051 | // is followed by a template-argument-list, the reference refers to the | ||||
1052 | // class template itself and not a specialization thereof, and is not | ||||
1053 | // ambiguous. | ||||
1054 | // | ||||
1055 | // This filtering can make an ambiguous result into an unambiguous one, | ||||
1056 | // so try again after filtering out template names. | ||||
1057 | FilterAcceptableTemplateNames(Result); | ||||
1058 | if (!Result.isAmbiguous()) { | ||||
1059 | IsFilteredTemplateName = true; | ||||
1060 | break; | ||||
1061 | } | ||||
1062 | } | ||||
1063 | |||||
1064 | // Diagnose the ambiguity and return an error. | ||||
1065 | return NameClassification::Error(); | ||||
1066 | } | ||||
1067 | |||||
1068 | if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && | ||||
1069 | (IsFilteredTemplateName || | ||||
1070 | hasAnyAcceptableTemplateNames( | ||||
1071 | Result, /*AllowFunctionTemplates=*/true, | ||||
1072 | /*AllowDependent=*/false, | ||||
1073 | /*AllowNonTemplateFunctions*/ SS.isEmpty() && | ||||
1074 | getLangOpts().CPlusPlus20))) { | ||||
1075 | // C++ [temp.names]p3: | ||||
1076 | // After name lookup (3.4) finds that a name is a template-name or that | ||||
1077 | // an operator-function-id or a literal- operator-id refers to a set of | ||||
1078 | // overloaded functions any member of which is a function template if | ||||
1079 | // this is followed by a <, the < is always taken as the delimiter of a | ||||
1080 | // template-argument-list and never as the less-than operator. | ||||
1081 | // C++2a [temp.names]p2: | ||||
1082 | // A name is also considered to refer to a template if it is an | ||||
1083 | // unqualified-id followed by a < and name lookup finds either one | ||||
1084 | // or more functions or finds nothing. | ||||
1085 | if (!IsFilteredTemplateName) | ||||
1086 | FilterAcceptableTemplateNames(Result); | ||||
1087 | |||||
1088 | bool IsFunctionTemplate; | ||||
1089 | bool IsVarTemplate; | ||||
1090 | TemplateName Template; | ||||
1091 | if (Result.end() - Result.begin() > 1) { | ||||
1092 | IsFunctionTemplate = true; | ||||
1093 | Template = Context.getOverloadedTemplateName(Result.begin(), | ||||
1094 | Result.end()); | ||||
1095 | } else if (!Result.empty()) { | ||||
1096 | auto *TD = cast<TemplateDecl>(getAsTemplateNameDecl( | ||||
1097 | *Result.begin(), /*AllowFunctionTemplates=*/true, | ||||
1098 | /*AllowDependent=*/false)); | ||||
1099 | IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); | ||||
1100 | IsVarTemplate = isa<VarTemplateDecl>(TD); | ||||
1101 | |||||
1102 | if (SS.isNotEmpty()) | ||||
1103 | Template = | ||||
1104 | Context.getQualifiedTemplateName(SS.getScopeRep(), | ||||
1105 | /*TemplateKeyword=*/false, TD); | ||||
1106 | else | ||||
1107 | Template = TemplateName(TD); | ||||
1108 | } else { | ||||
1109 | // All results were non-template functions. This is a function template | ||||
1110 | // name. | ||||
1111 | IsFunctionTemplate = true; | ||||
1112 | Template = Context.getAssumedTemplateName(NameInfo.getName()); | ||||
1113 | } | ||||
1114 | |||||
1115 | if (IsFunctionTemplate) { | ||||
1116 | // Function templates always go through overload resolution, at which | ||||
1117 | // point we'll perform the various checks (e.g., accessibility) we need | ||||
1118 | // to based on which function we selected. | ||||
1119 | Result.suppressDiagnostics(); | ||||
1120 | |||||
1121 | return NameClassification::FunctionTemplate(Template); | ||||
1122 | } | ||||
1123 | |||||
1124 | return IsVarTemplate ? NameClassification::VarTemplate(Template) | ||||
1125 | : NameClassification::TypeTemplate(Template); | ||||
1126 | } | ||||
1127 | |||||
1128 | NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); | ||||
1129 | if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { | ||||
1130 | DiagnoseUseOfDecl(Type, NameLoc); | ||||
1131 | MarkAnyDeclReferenced(Type->getLocation(), Type, /*OdrUse=*/false); | ||||
1132 | QualType T = Context.getTypeDeclType(Type); | ||||
1133 | if (SS.isNotEmpty()) | ||||
1134 | return buildNestedType(*this, SS, T, NameLoc); | ||||
1135 | return ParsedType::make(T); | ||||
1136 | } | ||||
1137 | |||||
1138 | ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); | ||||
1139 | if (!Class) { | ||||
1140 | // FIXME: It's unfortunate that we don't have a Type node for handling this. | ||||
1141 | if (ObjCCompatibleAliasDecl *Alias = | ||||
1142 | dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) | ||||
1143 | Class = Alias->getClassInterface(); | ||||
1144 | } | ||||
1145 | |||||
1146 | if (Class) { | ||||
1147 | DiagnoseUseOfDecl(Class, NameLoc); | ||||
1148 | |||||
1149 | if (NextToken.is(tok::period)) { | ||||
1150 | // Interface. <something> is parsed as a property reference expression. | ||||
1151 | // Just return "unknown" as a fall-through for now. | ||||
1152 | Result.suppressDiagnostics(); | ||||
1153 | return NameClassification::Unknown(); | ||||
1154 | } | ||||
1155 | |||||
1156 | QualType T = Context.getObjCInterfaceType(Class); | ||||
1157 | return ParsedType::make(T); | ||||
1158 | } | ||||
1159 | |||||
1160 | if (isa<ConceptDecl>(FirstDecl)) | ||||
1161 | return NameClassification::Concept( | ||||
1162 | TemplateName(cast<TemplateDecl>(FirstDecl))); | ||||
1163 | |||||
1164 | // We can have a type template here if we're classifying a template argument. | ||||
1165 | if (isa<TemplateDecl>(FirstDecl) && !isa<FunctionTemplateDecl>(FirstDecl) && | ||||
1166 | !isa<VarTemplateDecl>(FirstDecl)) | ||||
1167 | return NameClassification::TypeTemplate( | ||||
1168 | TemplateName(cast<TemplateDecl>(FirstDecl))); | ||||
1169 | |||||
1170 | // Check for a tag type hidden by a non-type decl in a few cases where it | ||||
1171 | // seems likely a type is wanted instead of the non-type that was found. | ||||
1172 | bool NextIsOp = NextToken.isOneOf(tok::amp, tok::star); | ||||
1173 | if ((NextToken.is(tok::identifier) || | ||||
1174 | (NextIsOp && | ||||
1175 | FirstDecl->getUnderlyingDecl()->isFunctionOrFunctionTemplate())) && | ||||
1176 | isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) { | ||||
1177 | TypeDecl *Type = Result.getAsSingle<TypeDecl>(); | ||||
1178 | DiagnoseUseOfDecl(Type, NameLoc); | ||||
1179 | QualType T = Context.getTypeDeclType(Type); | ||||
1180 | if (SS.isNotEmpty()) | ||||
1181 | return buildNestedType(*this, SS, T, NameLoc); | ||||
1182 | return ParsedType::make(T); | ||||
1183 | } | ||||
1184 | |||||
1185 | // If we already know which single declaration is referenced, just annotate | ||||
1186 | // that declaration directly. Defer resolving even non-overloaded class | ||||
1187 | // member accesses, as we need to defer certain access checks until we know | ||||
1188 | // the context. | ||||
1189 | bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); | ||||
1190 | if (Result.isSingleResult() && !ADL && !FirstDecl->isCXXClassMember()) | ||||
1191 | return NameClassification::NonType(Result.getRepresentativeDecl()); | ||||
1192 | |||||
1193 | // Otherwise, this is an overload set that we will need to resolve later. | ||||
1194 | Result.suppressDiagnostics(); | ||||
1195 | return NameClassification::OverloadSet(UnresolvedLookupExpr::Create( | ||||
1196 | Context, Result.getNamingClass(), SS.getWithLocInContext(Context), | ||||
1197 | Result.getLookupNameInfo(), ADL, Result.isOverloadedResult(), | ||||
1198 | Result.begin(), Result.end())); | ||||
1199 | } | ||||
1200 | |||||
1201 | ExprResult | ||||
1202 | Sema::ActOnNameClassifiedAsUndeclaredNonType(IdentifierInfo *Name, | ||||
1203 | SourceLocation NameLoc) { | ||||
1204 | assert(getLangOpts().CPlusPlus && "ADL-only call in C?")((getLangOpts().CPlusPlus && "ADL-only call in C?") ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"ADL-only call in C?\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1204, __PRETTY_FUNCTION__)); | ||||
1205 | CXXScopeSpec SS; | ||||
1206 | LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); | ||||
1207 | return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); | ||||
1208 | } | ||||
1209 | |||||
1210 | ExprResult | ||||
1211 | Sema::ActOnNameClassifiedAsDependentNonType(const CXXScopeSpec &SS, | ||||
1212 | IdentifierInfo *Name, | ||||
1213 | SourceLocation NameLoc, | ||||
1214 | bool IsAddressOfOperand) { | ||||
1215 | DeclarationNameInfo NameInfo(Name, NameLoc); | ||||
1216 | return ActOnDependentIdExpression(SS, /*TemplateKWLoc=*/SourceLocation(), | ||||
1217 | NameInfo, IsAddressOfOperand, | ||||
1218 | /*TemplateArgs=*/nullptr); | ||||
1219 | } | ||||
1220 | |||||
1221 | ExprResult Sema::ActOnNameClassifiedAsNonType(Scope *S, const CXXScopeSpec &SS, | ||||
1222 | NamedDecl *Found, | ||||
1223 | SourceLocation NameLoc, | ||||
1224 | const Token &NextToken) { | ||||
1225 | if (getCurMethodDecl() && SS.isEmpty()) | ||||
1226 | if (auto *Ivar = dyn_cast<ObjCIvarDecl>(Found->getUnderlyingDecl())) | ||||
1227 | return BuildIvarRefExpr(S, NameLoc, Ivar); | ||||
1228 | |||||
1229 | // Reconstruct the lookup result. | ||||
1230 | LookupResult Result(*this, Found->getDeclName(), NameLoc, LookupOrdinaryName); | ||||
1231 | Result.addDecl(Found); | ||||
1232 | Result.resolveKind(); | ||||
1233 | |||||
1234 | bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); | ||||
1235 | return BuildDeclarationNameExpr(SS, Result, ADL); | ||||
1236 | } | ||||
1237 | |||||
1238 | ExprResult Sema::ActOnNameClassifiedAsOverloadSet(Scope *S, Expr *E) { | ||||
1239 | // For an implicit class member access, transform the result into a member | ||||
1240 | // access expression if necessary. | ||||
1241 | auto *ULE = cast<UnresolvedLookupExpr>(E); | ||||
1242 | if ((*ULE->decls_begin())->isCXXClassMember()) { | ||||
1243 | CXXScopeSpec SS; | ||||
1244 | SS.Adopt(ULE->getQualifierLoc()); | ||||
1245 | |||||
1246 | // Reconstruct the lookup result. | ||||
1247 | LookupResult Result(*this, ULE->getName(), ULE->getNameLoc(), | ||||
1248 | LookupOrdinaryName); | ||||
1249 | Result.setNamingClass(ULE->getNamingClass()); | ||||
1250 | for (auto I = ULE->decls_begin(), E = ULE->decls_end(); I != E; ++I) | ||||
1251 | Result.addDecl(*I, I.getAccess()); | ||||
1252 | Result.resolveKind(); | ||||
1253 | return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, | ||||
1254 | nullptr, S); | ||||
1255 | } | ||||
1256 | |||||
1257 | // Otherwise, this is already in the form we needed, and no further checks | ||||
1258 | // are necessary. | ||||
1259 | return ULE; | ||||
1260 | } | ||||
1261 | |||||
1262 | Sema::TemplateNameKindForDiagnostics | ||||
1263 | Sema::getTemplateNameKindForDiagnostics(TemplateName Name) { | ||||
1264 | auto *TD = Name.getAsTemplateDecl(); | ||||
1265 | if (!TD) | ||||
1266 | return TemplateNameKindForDiagnostics::DependentTemplate; | ||||
1267 | if (isa<ClassTemplateDecl>(TD)) | ||||
1268 | return TemplateNameKindForDiagnostics::ClassTemplate; | ||||
1269 | if (isa<FunctionTemplateDecl>(TD)) | ||||
1270 | return TemplateNameKindForDiagnostics::FunctionTemplate; | ||||
1271 | if (isa<VarTemplateDecl>(TD)) | ||||
1272 | return TemplateNameKindForDiagnostics::VarTemplate; | ||||
1273 | if (isa<TypeAliasTemplateDecl>(TD)) | ||||
1274 | return TemplateNameKindForDiagnostics::AliasTemplate; | ||||
1275 | if (isa<TemplateTemplateParmDecl>(TD)) | ||||
1276 | return TemplateNameKindForDiagnostics::TemplateTemplateParam; | ||||
1277 | if (isa<ConceptDecl>(TD)) | ||||
1278 | return TemplateNameKindForDiagnostics::Concept; | ||||
1279 | return TemplateNameKindForDiagnostics::DependentTemplate; | ||||
1280 | } | ||||
1281 | |||||
1282 | void Sema::PushDeclContext(Scope *S, DeclContext *DC) { | ||||
1283 | assert(DC->getLexicalParent() == CurContext &&((DC->getLexicalParent() == CurContext && "The next DeclContext should be lexically contained in the current one." ) ? static_cast<void> (0) : __assert_fail ("DC->getLexicalParent() == CurContext && \"The next DeclContext should be lexically contained in the current one.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1284, __PRETTY_FUNCTION__)) | ||||
1284 | "The next DeclContext should be lexically contained in the current one.")((DC->getLexicalParent() == CurContext && "The next DeclContext should be lexically contained in the current one." ) ? static_cast<void> (0) : __assert_fail ("DC->getLexicalParent() == CurContext && \"The next DeclContext should be lexically contained in the current one.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1284, __PRETTY_FUNCTION__)); | ||||
1285 | CurContext = DC; | ||||
1286 | S->setEntity(DC); | ||||
1287 | } | ||||
1288 | |||||
1289 | void Sema::PopDeclContext() { | ||||
1290 | assert(CurContext && "DeclContext imbalance!")((CurContext && "DeclContext imbalance!") ? static_cast <void> (0) : __assert_fail ("CurContext && \"DeclContext imbalance!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1290, __PRETTY_FUNCTION__)); | ||||
1291 | |||||
1292 | CurContext = CurContext->getLexicalParent(); | ||||
1293 | assert(CurContext && "Popped translation unit!")((CurContext && "Popped translation unit!") ? static_cast <void> (0) : __assert_fail ("CurContext && \"Popped translation unit!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1293, __PRETTY_FUNCTION__)); | ||||
1294 | } | ||||
1295 | |||||
1296 | Sema::SkippedDefinitionContext Sema::ActOnTagStartSkippedDefinition(Scope *S, | ||||
1297 | Decl *D) { | ||||
1298 | // Unlike PushDeclContext, the context to which we return is not necessarily | ||||
1299 | // the containing DC of TD, because the new context will be some pre-existing | ||||
1300 | // TagDecl definition instead of a fresh one. | ||||
1301 | auto Result = static_cast<SkippedDefinitionContext>(CurContext); | ||||
1302 | CurContext = cast<TagDecl>(D)->getDefinition(); | ||||
1303 | assert(CurContext && "skipping definition of undefined tag")((CurContext && "skipping definition of undefined tag" ) ? static_cast<void> (0) : __assert_fail ("CurContext && \"skipping definition of undefined tag\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1303, __PRETTY_FUNCTION__)); | ||||
1304 | // Start lookups from the parent of the current context; we don't want to look | ||||
1305 | // into the pre-existing complete definition. | ||||
1306 | S->setEntity(CurContext->getLookupParent()); | ||||
1307 | return Result; | ||||
1308 | } | ||||
1309 | |||||
1310 | void Sema::ActOnTagFinishSkippedDefinition(SkippedDefinitionContext Context) { | ||||
1311 | CurContext = static_cast<decltype(CurContext)>(Context); | ||||
1312 | } | ||||
1313 | |||||
1314 | /// EnterDeclaratorContext - Used when we must lookup names in the context | ||||
1315 | /// of a declarator's nested name specifier. | ||||
1316 | /// | ||||
1317 | void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { | ||||
1318 | // C++0x [basic.lookup.unqual]p13: | ||||
1319 | // A name used in the definition of a static data member of class | ||||
1320 | // X (after the qualified-id of the static member) is looked up as | ||||
1321 | // if the name was used in a member function of X. | ||||
1322 | // C++0x [basic.lookup.unqual]p14: | ||||
1323 | // If a variable member of a namespace is defined outside of the | ||||
1324 | // scope of its namespace then any name used in the definition of | ||||
1325 | // the variable member (after the declarator-id) is looked up as | ||||
1326 | // if the definition of the variable member occurred in its | ||||
1327 | // namespace. | ||||
1328 | // Both of these imply that we should push a scope whose context | ||||
1329 | // is the semantic context of the declaration. We can't use | ||||
1330 | // PushDeclContext here because that context is not necessarily | ||||
1331 | // lexically contained in the current context. Fortunately, | ||||
1332 | // the containing scope should have the appropriate information. | ||||
1333 | |||||
1334 | assert(!S->getEntity() && "scope already has entity")((!S->getEntity() && "scope already has entity") ? static_cast<void> (0) : __assert_fail ("!S->getEntity() && \"scope already has entity\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1334, __PRETTY_FUNCTION__)); | ||||
1335 | |||||
1336 | #ifndef NDEBUG | ||||
1337 | Scope *Ancestor = S->getParent(); | ||||
1338 | while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); | ||||
1339 | assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch")((Ancestor->getEntity() == CurContext && "ancestor context mismatch" ) ? static_cast<void> (0) : __assert_fail ("Ancestor->getEntity() == CurContext && \"ancestor context mismatch\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1339, __PRETTY_FUNCTION__)); | ||||
1340 | #endif | ||||
1341 | |||||
1342 | CurContext = DC; | ||||
1343 | S->setEntity(DC); | ||||
1344 | |||||
1345 | if (S->getParent()->isTemplateParamScope()) { | ||||
1346 | // Also set the corresponding entities for all immediately-enclosing | ||||
1347 | // template parameter scopes. | ||||
1348 | EnterTemplatedContext(S->getParent(), DC); | ||||
1349 | } | ||||
1350 | } | ||||
1351 | |||||
1352 | void Sema::ExitDeclaratorContext(Scope *S) { | ||||
1353 | assert(S->getEntity() == CurContext && "Context imbalance!")((S->getEntity() == CurContext && "Context imbalance!" ) ? static_cast<void> (0) : __assert_fail ("S->getEntity() == CurContext && \"Context imbalance!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1353, __PRETTY_FUNCTION__)); | ||||
1354 | |||||
1355 | // Switch back to the lexical context. The safety of this is | ||||
1356 | // enforced by an assert in EnterDeclaratorContext. | ||||
1357 | Scope *Ancestor = S->getParent(); | ||||
1358 | while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); | ||||
1359 | CurContext = Ancestor->getEntity(); | ||||
1360 | |||||
1361 | // We don't need to do anything with the scope, which is going to | ||||
1362 | // disappear. | ||||
1363 | } | ||||
1364 | |||||
1365 | void Sema::EnterTemplatedContext(Scope *S, DeclContext *DC) { | ||||
1366 | assert(S->isTemplateParamScope() &&((S->isTemplateParamScope() && "expected to be initializing a template parameter scope" ) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"expected to be initializing a template parameter scope\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1367, __PRETTY_FUNCTION__)) | ||||
1367 | "expected to be initializing a template parameter scope")((S->isTemplateParamScope() && "expected to be initializing a template parameter scope" ) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"expected to be initializing a template parameter scope\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1367, __PRETTY_FUNCTION__)); | ||||
1368 | |||||
1369 | // C++20 [temp.local]p7: | ||||
1370 | // In the definition of a member of a class template that appears outside | ||||
1371 | // of the class template definition, the name of a member of the class | ||||
1372 | // template hides the name of a template-parameter of any enclosing class | ||||
1373 | // templates (but not a template-parameter of the member if the member is a | ||||
1374 | // class or function template). | ||||
1375 | // C++20 [temp.local]p9: | ||||
1376 | // In the definition of a class template or in the definition of a member | ||||
1377 | // of such a template that appears outside of the template definition, for | ||||
1378 | // each non-dependent base class (13.8.2.1), if the name of the base class | ||||
1379 | // or the name of a member of the base class is the same as the name of a | ||||
1380 | // template-parameter, the base class name or member name hides the | ||||
1381 | // template-parameter name (6.4.10). | ||||
1382 | // | ||||
1383 | // This means that a template parameter scope should be searched immediately | ||||
1384 | // after searching the DeclContext for which it is a template parameter | ||||
1385 | // scope. For example, for | ||||
1386 | // template<typename T> template<typename U> template<typename V> | ||||
1387 | // void N::A<T>::B<U>::f(...) | ||||
1388 | // we search V then B<U> (and base classes) then U then A<T> (and base | ||||
1389 | // classes) then T then N then ::. | ||||
1390 | unsigned ScopeDepth = getTemplateDepth(S); | ||||
1391 | for (; S && S->isTemplateParamScope(); S = S->getParent(), --ScopeDepth) { | ||||
1392 | DeclContext *SearchDCAfterScope = DC; | ||||
1393 | for (; DC; DC = DC->getLookupParent()) { | ||||
1394 | if (const TemplateParameterList *TPL = | ||||
1395 | cast<Decl>(DC)->getDescribedTemplateParams()) { | ||||
1396 | unsigned DCDepth = TPL->getDepth() + 1; | ||||
1397 | if (DCDepth > ScopeDepth) | ||||
1398 | continue; | ||||
1399 | if (ScopeDepth == DCDepth) | ||||
1400 | SearchDCAfterScope = DC = DC->getLookupParent(); | ||||
1401 | break; | ||||
1402 | } | ||||
1403 | } | ||||
1404 | S->setLookupEntity(SearchDCAfterScope); | ||||
1405 | } | ||||
1406 | } | ||||
1407 | |||||
1408 | void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { | ||||
1409 | // We assume that the caller has already called | ||||
1410 | // ActOnReenterTemplateScope so getTemplatedDecl() works. | ||||
1411 | FunctionDecl *FD = D->getAsFunction(); | ||||
1412 | if (!FD) | ||||
1413 | return; | ||||
1414 | |||||
1415 | // Same implementation as PushDeclContext, but enters the context | ||||
1416 | // from the lexical parent, rather than the top-level class. | ||||
1417 | assert(CurContext == FD->getLexicalParent() &&((CurContext == FD->getLexicalParent() && "The next DeclContext should be lexically contained in the current one." ) ? static_cast<void> (0) : __assert_fail ("CurContext == FD->getLexicalParent() && \"The next DeclContext should be lexically contained in the current one.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1418, __PRETTY_FUNCTION__)) | ||||
1418 | "The next DeclContext should be lexically contained in the current one.")((CurContext == FD->getLexicalParent() && "The next DeclContext should be lexically contained in the current one." ) ? static_cast<void> (0) : __assert_fail ("CurContext == FD->getLexicalParent() && \"The next DeclContext should be lexically contained in the current one.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1418, __PRETTY_FUNCTION__)); | ||||
1419 | CurContext = FD; | ||||
1420 | S->setEntity(CurContext); | ||||
1421 | |||||
1422 | for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { | ||||
1423 | ParmVarDecl *Param = FD->getParamDecl(P); | ||||
1424 | // If the parameter has an identifier, then add it to the scope | ||||
1425 | if (Param->getIdentifier()) { | ||||
1426 | S->AddDecl(Param); | ||||
1427 | IdResolver.AddDecl(Param); | ||||
1428 | } | ||||
1429 | } | ||||
1430 | } | ||||
1431 | |||||
1432 | void Sema::ActOnExitFunctionContext() { | ||||
1433 | // Same implementation as PopDeclContext, but returns to the lexical parent, | ||||
1434 | // rather than the top-level class. | ||||
1435 | assert(CurContext && "DeclContext imbalance!")((CurContext && "DeclContext imbalance!") ? static_cast <void> (0) : __assert_fail ("CurContext && \"DeclContext imbalance!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1435, __PRETTY_FUNCTION__)); | ||||
1436 | CurContext = CurContext->getLexicalParent(); | ||||
1437 | assert(CurContext && "Popped translation unit!")((CurContext && "Popped translation unit!") ? static_cast <void> (0) : __assert_fail ("CurContext && \"Popped translation unit!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1437, __PRETTY_FUNCTION__)); | ||||
1438 | } | ||||
1439 | |||||
1440 | /// Determine whether we allow overloading of the function | ||||
1441 | /// PrevDecl with another declaration. | ||||
1442 | /// | ||||
1443 | /// This routine determines whether overloading is possible, not | ||||
1444 | /// whether some new function is actually an overload. It will return | ||||
1445 | /// true in C++ (where we can always provide overloads) or, as an | ||||
1446 | /// extension, in C when the previous function is already an | ||||
1447 | /// overloaded function declaration or has the "overloadable" | ||||
1448 | /// attribute. | ||||
1449 | static bool AllowOverloadingOfFunction(LookupResult &Previous, | ||||
1450 | ASTContext &Context, | ||||
1451 | const FunctionDecl *New) { | ||||
1452 | if (Context.getLangOpts().CPlusPlus) | ||||
1453 | return true; | ||||
1454 | |||||
1455 | if (Previous.getResultKind() == LookupResult::FoundOverloaded) | ||||
1456 | return true; | ||||
1457 | |||||
1458 | return Previous.getResultKind() == LookupResult::Found && | ||||
1459 | (Previous.getFoundDecl()->hasAttr<OverloadableAttr>() || | ||||
1460 | New->hasAttr<OverloadableAttr>()); | ||||
1461 | } | ||||
1462 | |||||
1463 | /// Add this decl to the scope shadowed decl chains. | ||||
1464 | void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { | ||||
1465 | // Move up the scope chain until we find the nearest enclosing | ||||
1466 | // non-transparent context. The declaration will be introduced into this | ||||
1467 | // scope. | ||||
1468 | while (S->getEntity() && S->getEntity()->isTransparentContext()) | ||||
1469 | S = S->getParent(); | ||||
1470 | |||||
1471 | // Add scoped declarations into their context, so that they can be | ||||
1472 | // found later. Declarations without a context won't be inserted | ||||
1473 | // into any context. | ||||
1474 | if (AddToContext) | ||||
1475 | CurContext->addDecl(D); | ||||
1476 | |||||
1477 | // Out-of-line definitions shouldn't be pushed into scope in C++, unless they | ||||
1478 | // are function-local declarations. | ||||
1479 | if (getLangOpts().CPlusPlus && D->isOutOfLine() && !S->getFnParent()) | ||||
1480 | return; | ||||
1481 | |||||
1482 | // Template instantiations should also not be pushed into scope. | ||||
1483 | if (isa<FunctionDecl>(D) && | ||||
1484 | cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) | ||||
1485 | return; | ||||
1486 | |||||
1487 | // If this replaces anything in the current scope, | ||||
1488 | IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), | ||||
1489 | IEnd = IdResolver.end(); | ||||
1490 | for (; I != IEnd; ++I) { | ||||
1491 | if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { | ||||
1492 | S->RemoveDecl(*I); | ||||
1493 | IdResolver.RemoveDecl(*I); | ||||
1494 | |||||
1495 | // Should only need to replace one decl. | ||||
1496 | break; | ||||
1497 | } | ||||
1498 | } | ||||
1499 | |||||
1500 | S->AddDecl(D); | ||||
1501 | |||||
1502 | if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { | ||||
1503 | // Implicitly-generated labels may end up getting generated in an order that | ||||
1504 | // isn't strictly lexical, which breaks name lookup. Be careful to insert | ||||
1505 | // the label at the appropriate place in the identifier chain. | ||||
1506 | for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { | ||||
1507 | DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); | ||||
1508 | if (IDC == CurContext) { | ||||
1509 | if (!S->isDeclScope(*I)) | ||||
1510 | continue; | ||||
1511 | } else if (IDC->Encloses(CurContext)) | ||||
1512 | break; | ||||
1513 | } | ||||
1514 | |||||
1515 | IdResolver.InsertDeclAfter(I, D); | ||||
1516 | } else { | ||||
1517 | IdResolver.AddDecl(D); | ||||
1518 | } | ||||
1519 | } | ||||
1520 | |||||
1521 | bool Sema::isDeclInScope(NamedDecl *D, DeclContext *Ctx, Scope *S, | ||||
1522 | bool AllowInlineNamespace) { | ||||
1523 | return IdResolver.isDeclInScope(D, Ctx, S, AllowInlineNamespace); | ||||
1524 | } | ||||
1525 | |||||
1526 | Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { | ||||
1527 | DeclContext *TargetDC = DC->getPrimaryContext(); | ||||
1528 | do { | ||||
1529 | if (DeclContext *ScopeDC = S->getEntity()) | ||||
1530 | if (ScopeDC->getPrimaryContext() == TargetDC) | ||||
1531 | return S; | ||||
1532 | } while ((S = S->getParent())); | ||||
1533 | |||||
1534 | return nullptr; | ||||
1535 | } | ||||
1536 | |||||
1537 | static bool isOutOfScopePreviousDeclaration(NamedDecl *, | ||||
1538 | DeclContext*, | ||||
1539 | ASTContext&); | ||||
1540 | |||||
1541 | /// Filters out lookup results that don't fall within the given scope | ||||
1542 | /// as determined by isDeclInScope. | ||||
1543 | void Sema::FilterLookupForScope(LookupResult &R, DeclContext *Ctx, Scope *S, | ||||
1544 | bool ConsiderLinkage, | ||||
1545 | bool AllowInlineNamespace) { | ||||
1546 | LookupResult::Filter F = R.makeFilter(); | ||||
1547 | while (F.hasNext()) { | ||||
1548 | NamedDecl *D = F.next(); | ||||
1549 | |||||
1550 | if (isDeclInScope(D, Ctx, S, AllowInlineNamespace)) | ||||
1551 | continue; | ||||
1552 | |||||
1553 | if (ConsiderLinkage && isOutOfScopePreviousDeclaration(D, Ctx, Context)) | ||||
1554 | continue; | ||||
1555 | |||||
1556 | F.erase(); | ||||
1557 | } | ||||
1558 | |||||
1559 | F.done(); | ||||
1560 | } | ||||
1561 | |||||
1562 | /// We've determined that \p New is a redeclaration of \p Old. Check that they | ||||
1563 | /// have compatible owning modules. | ||||
1564 | bool Sema::CheckRedeclarationModuleOwnership(NamedDecl *New, NamedDecl *Old) { | ||||
1565 | // FIXME: The Modules TS is not clear about how friend declarations are | ||||
1566 | // to be treated. It's not meaningful to have different owning modules for | ||||
1567 | // linkage in redeclarations of the same entity, so for now allow the | ||||
1568 | // redeclaration and change the owning modules to match. | ||||
1569 | if (New->getFriendObjectKind() && | ||||
1570 | Old->getOwningModuleForLinkage() != New->getOwningModuleForLinkage()) { | ||||
1571 | New->setLocalOwningModule(Old->getOwningModule()); | ||||
1572 | makeMergedDefinitionVisible(New); | ||||
1573 | return false; | ||||
1574 | } | ||||
1575 | |||||
1576 | Module *NewM = New->getOwningModule(); | ||||
1577 | Module *OldM = Old->getOwningModule(); | ||||
1578 | |||||
1579 | if (NewM
| ||||
1580 | NewM = NewM->Parent; | ||||
1581 | if (OldM
| ||||
1582 | OldM = OldM->Parent; | ||||
1583 | |||||
1584 | if (NewM
| ||||
1585 | return false; | ||||
1586 | |||||
1587 | bool NewIsModuleInterface = NewM && NewM->isModulePurview(); | ||||
1588 | bool OldIsModuleInterface = OldM && OldM->isModulePurview(); | ||||
1589 | if (NewIsModuleInterface || OldIsModuleInterface) { | ||||
1590 | // C++ Modules TS [basic.def.odr] 6.2/6.7 [sic]: | ||||
1591 | // if a declaration of D [...] appears in the purview of a module, all | ||||
1592 | // other such declarations shall appear in the purview of the same module | ||||
1593 | Diag(New->getLocation(), diag::err_mismatched_owning_module) | ||||
1594 | << New | ||||
1595 | << NewIsModuleInterface | ||||
1596 | << (NewIsModuleInterface ? NewM->getFullModuleName() : "") | ||||
1597 | << OldIsModuleInterface | ||||
1598 | << (OldIsModuleInterface ? OldM->getFullModuleName() : ""); | ||||
1599 | Diag(Old->getLocation(), diag::note_previous_declaration); | ||||
1600 | New->setInvalidDecl(); | ||||
1601 | return true; | ||||
1602 | } | ||||
1603 | |||||
1604 | return false; | ||||
1605 | } | ||||
1606 | |||||
1607 | static bool isUsingDecl(NamedDecl *D) { | ||||
1608 | return isa<UsingShadowDecl>(D) || | ||||
1609 | isa<UnresolvedUsingTypenameDecl>(D) || | ||||
1610 | isa<UnresolvedUsingValueDecl>(D); | ||||
1611 | } | ||||
1612 | |||||
1613 | /// Removes using shadow declarations from the lookup results. | ||||
1614 | static void RemoveUsingDecls(LookupResult &R) { | ||||
1615 | LookupResult::Filter F = R.makeFilter(); | ||||
1616 | while (F.hasNext()) | ||||
1617 | if (isUsingDecl(F.next())) | ||||
1618 | F.erase(); | ||||
1619 | |||||
1620 | F.done(); | ||||
1621 | } | ||||
1622 | |||||
1623 | /// Check for this common pattern: | ||||
1624 | /// @code | ||||
1625 | /// class S { | ||||
1626 | /// S(const S&); // DO NOT IMPLEMENT | ||||
1627 | /// void operator=(const S&); // DO NOT IMPLEMENT | ||||
1628 | /// }; | ||||
1629 | /// @endcode | ||||
1630 | static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { | ||||
1631 | // FIXME: Should check for private access too but access is set after we get | ||||
1632 | // the decl here. | ||||
1633 | if (D->doesThisDeclarationHaveABody()) | ||||
1634 | return false; | ||||
1635 | |||||
1636 | if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) | ||||
1637 | return CD->isCopyConstructor(); | ||||
1638 | return D->isCopyAssignmentOperator(); | ||||
1639 | } | ||||
1640 | |||||
1641 | // We need this to handle | ||||
1642 | // | ||||
1643 | // typedef struct { | ||||
1644 | // void *foo() { return 0; } | ||||
1645 | // } A; | ||||
1646 | // | ||||
1647 | // When we see foo we don't know if after the typedef we will get 'A' or '*A' | ||||
1648 | // for example. If 'A', foo will have external linkage. If we have '*A', | ||||
1649 | // foo will have no linkage. Since we can't know until we get to the end | ||||
1650 | // of the typedef, this function finds out if D might have non-external linkage. | ||||
1651 | // Callers should verify at the end of the TU if it D has external linkage or | ||||
1652 | // not. | ||||
1653 | bool Sema::mightHaveNonExternalLinkage(const DeclaratorDecl *D) { | ||||
1654 | const DeclContext *DC = D->getDeclContext(); | ||||
1655 | while (!DC->isTranslationUnit()) { | ||||
1656 | if (const RecordDecl *RD = dyn_cast<RecordDecl>(DC)){ | ||||
1657 | if (!RD->hasNameForLinkage()) | ||||
1658 | return true; | ||||
1659 | } | ||||
1660 | DC = DC->getParent(); | ||||
1661 | } | ||||
1662 | |||||
1663 | return !D->isExternallyVisible(); | ||||
1664 | } | ||||
1665 | |||||
1666 | // FIXME: This needs to be refactored; some other isInMainFile users want | ||||
1667 | // these semantics. | ||||
1668 | static bool isMainFileLoc(const Sema &S, SourceLocation Loc) { | ||||
1669 | if (S.TUKind != TU_Complete) | ||||
1670 | return false; | ||||
1671 | return S.SourceMgr.isInMainFile(Loc); | ||||
1672 | } | ||||
1673 | |||||
1674 | bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { | ||||
1675 | assert(D)((D) ? static_cast<void> (0) : __assert_fail ("D", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1675, __PRETTY_FUNCTION__)); | ||||
1676 | |||||
1677 | if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) | ||||
1678 | return false; | ||||
1679 | |||||
1680 | // Ignore all entities declared within templates, and out-of-line definitions | ||||
1681 | // of members of class templates. | ||||
1682 | if (D->getDeclContext()->isDependentContext() || | ||||
1683 | D->getLexicalDeclContext()->isDependentContext()) | ||||
1684 | return false; | ||||
1685 | |||||
1686 | if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { | ||||
1687 | if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) | ||||
1688 | return false; | ||||
1689 | // A non-out-of-line declaration of a member specialization was implicitly | ||||
1690 | // instantiated; it's the out-of-line declaration that we're interested in. | ||||
1691 | if (FD->getTemplateSpecializationKind() == TSK_ExplicitSpecialization && | ||||
1692 | FD->getMemberSpecializationInfo() && !FD->isOutOfLine()) | ||||
1693 | return false; | ||||
1694 | |||||
1695 | if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { | ||||
1696 | if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) | ||||
1697 | return false; | ||||
1698 | } else { | ||||
1699 | // 'static inline' functions are defined in headers; don't warn. | ||||
1700 | if (FD->isInlined() && !isMainFileLoc(*this, FD->getLocation())) | ||||
1701 | return false; | ||||
1702 | } | ||||
1703 | |||||
1704 | if (FD->doesThisDeclarationHaveABody() && | ||||
1705 | Context.DeclMustBeEmitted(FD)) | ||||
1706 | return false; | ||||
1707 | } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { | ||||
1708 | // Constants and utility variables are defined in headers with internal | ||||
1709 | // linkage; don't warn. (Unlike functions, there isn't a convenient marker | ||||
1710 | // like "inline".) | ||||
1711 | if (!isMainFileLoc(*this, VD->getLocation())) | ||||
1712 | return false; | ||||
1713 | |||||
1714 | if (Context.DeclMustBeEmitted(VD)) | ||||
1715 | return false; | ||||
1716 | |||||
1717 | if (VD->isStaticDataMember() && | ||||
1718 | VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) | ||||
1719 | return false; | ||||
1720 | if (VD->isStaticDataMember() && | ||||
1721 | VD->getTemplateSpecializationKind() == TSK_ExplicitSpecialization && | ||||
1722 | VD->getMemberSpecializationInfo() && !VD->isOutOfLine()) | ||||
1723 | return false; | ||||
1724 | |||||
1725 | if (VD->isInline() && !isMainFileLoc(*this, VD->getLocation())) | ||||
1726 | return false; | ||||
1727 | } else { | ||||
1728 | return false; | ||||
1729 | } | ||||
1730 | |||||
1731 | // Only warn for unused decls internal to the translation unit. | ||||
1732 | // FIXME: This seems like a bogus check; it suppresses -Wunused-function | ||||
1733 | // for inline functions defined in the main source file, for instance. | ||||
1734 | return mightHaveNonExternalLinkage(D); | ||||
1735 | } | ||||
1736 | |||||
1737 | void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { | ||||
1738 | if (!D) | ||||
1739 | return; | ||||
1740 | |||||
1741 | if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { | ||||
1742 | const FunctionDecl *First = FD->getFirstDecl(); | ||||
1743 | if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) | ||||
1744 | return; // First should already be in the vector. | ||||
1745 | } | ||||
1746 | |||||
1747 | if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { | ||||
1748 | const VarDecl *First = VD->getFirstDecl(); | ||||
1749 | if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) | ||||
1750 | return; // First should already be in the vector. | ||||
1751 | } | ||||
1752 | |||||
1753 | if (ShouldWarnIfUnusedFileScopedDecl(D)) | ||||
1754 | UnusedFileScopedDecls.push_back(D); | ||||
1755 | } | ||||
1756 | |||||
1757 | static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { | ||||
1758 | if (D->isInvalidDecl()) | ||||
1759 | return false; | ||||
1760 | |||||
1761 | if (auto *DD = dyn_cast<DecompositionDecl>(D)) { | ||||
1762 | // For a decomposition declaration, warn if none of the bindings are | ||||
1763 | // referenced, instead of if the variable itself is referenced (which | ||||
1764 | // it is, by the bindings' expressions). | ||||
1765 | for (auto *BD : DD->bindings()) | ||||
1766 | if (BD->isReferenced()) | ||||
1767 | return false; | ||||
1768 | } else if (!D->getDeclName()) { | ||||
1769 | return false; | ||||
1770 | } else if (D->isReferenced() || D->isUsed()) { | ||||
1771 | return false; | ||||
1772 | } | ||||
1773 | |||||
1774 | if (D->hasAttr<UnusedAttr>() || D->hasAttr<ObjCPreciseLifetimeAttr>()) | ||||
1775 | return false; | ||||
1776 | |||||
1777 | if (isa<LabelDecl>(D)) | ||||
1778 | return true; | ||||
1779 | |||||
1780 | // Except for labels, we only care about unused decls that are local to | ||||
1781 | // functions. | ||||
1782 | bool WithinFunction = D->getDeclContext()->isFunctionOrMethod(); | ||||
1783 | if (const auto *R = dyn_cast<CXXRecordDecl>(D->getDeclContext())) | ||||
1784 | // For dependent types, the diagnostic is deferred. | ||||
1785 | WithinFunction = | ||||
1786 | WithinFunction || (R->isLocalClass() && !R->isDependentType()); | ||||
1787 | if (!WithinFunction) | ||||
1788 | return false; | ||||
1789 | |||||
1790 | if (isa<TypedefNameDecl>(D)) | ||||
1791 | return true; | ||||
1792 | |||||
1793 | // White-list anything that isn't a local variable. | ||||
1794 | if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) | ||||
1795 | return false; | ||||
1796 | |||||
1797 | // Types of valid local variables should be complete, so this should succeed. | ||||
1798 | if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { | ||||
1799 | |||||
1800 | // White-list anything with an __attribute__((unused)) type. | ||||
1801 | const auto *Ty = VD->getType().getTypePtr(); | ||||
1802 | |||||
1803 | // Only look at the outermost level of typedef. | ||||
1804 | if (const TypedefType *TT = Ty->getAs<TypedefType>()) { | ||||
1805 | if (TT->getDecl()->hasAttr<UnusedAttr>()) | ||||
1806 | return false; | ||||
1807 | } | ||||
1808 | |||||
1809 | // If we failed to complete the type for some reason, or if the type is | ||||
1810 | // dependent, don't diagnose the variable. | ||||
1811 | if (Ty->isIncompleteType() || Ty->isDependentType()) | ||||
1812 | return false; | ||||
1813 | |||||
1814 | // Look at the element type to ensure that the warning behaviour is | ||||
1815 | // consistent for both scalars and arrays. | ||||
1816 | Ty = Ty->getBaseElementTypeUnsafe(); | ||||
1817 | |||||
1818 | if (const TagType *TT = Ty->getAs<TagType>()) { | ||||
1819 | const TagDecl *Tag = TT->getDecl(); | ||||
1820 | if (Tag->hasAttr<UnusedAttr>()) | ||||
1821 | return false; | ||||
1822 | |||||
1823 | if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { | ||||
1824 | if (!RD->hasTrivialDestructor() && !RD->hasAttr<WarnUnusedAttr>()) | ||||
1825 | return false; | ||||
1826 | |||||
1827 | if (const Expr *Init = VD->getInit()) { | ||||
1828 | if (const ExprWithCleanups *Cleanups = | ||||
1829 | dyn_cast<ExprWithCleanups>(Init)) | ||||
1830 | Init = Cleanups->getSubExpr(); | ||||
1831 | const CXXConstructExpr *Construct = | ||||
1832 | dyn_cast<CXXConstructExpr>(Init); | ||||
1833 | if (Construct && !Construct->isElidable()) { | ||||
1834 | CXXConstructorDecl *CD = Construct->getConstructor(); | ||||
1835 | if (!CD->isTrivial() && !RD->hasAttr<WarnUnusedAttr>() && | ||||
1836 | (VD->getInit()->isValueDependent() || !VD->evaluateValue())) | ||||
1837 | return false; | ||||
1838 | } | ||||
1839 | |||||
1840 | // Suppress the warning if we don't know how this is constructed, and | ||||
1841 | // it could possibly be non-trivial constructor. | ||||
1842 | if (Init->isTypeDependent()) | ||||
1843 | for (const CXXConstructorDecl *Ctor : RD->ctors()) | ||||
1844 | if (!Ctor->isTrivial()) | ||||
1845 | return false; | ||||
1846 | } | ||||
1847 | } | ||||
1848 | } | ||||
1849 | |||||
1850 | // TODO: __attribute__((unused)) templates? | ||||
1851 | } | ||||
1852 | |||||
1853 | return true; | ||||
1854 | } | ||||
1855 | |||||
1856 | static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, | ||||
1857 | FixItHint &Hint) { | ||||
1858 | if (isa<LabelDecl>(D)) { | ||||
1859 | SourceLocation AfterColon = Lexer::findLocationAfterToken( | ||||
1860 | D->getEndLoc(), tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), | ||||
1861 | true); | ||||
1862 | if (AfterColon.isInvalid()) | ||||
1863 | return; | ||||
1864 | Hint = FixItHint::CreateRemoval( | ||||
1865 | CharSourceRange::getCharRange(D->getBeginLoc(), AfterColon)); | ||||
1866 | } | ||||
1867 | } | ||||
1868 | |||||
1869 | void Sema::DiagnoseUnusedNestedTypedefs(const RecordDecl *D) { | ||||
1870 | if (D->getTypeForDecl()->isDependentType()) | ||||
1871 | return; | ||||
1872 | |||||
1873 | for (auto *TmpD : D->decls()) { | ||||
1874 | if (const auto *T = dyn_cast<TypedefNameDecl>(TmpD)) | ||||
1875 | DiagnoseUnusedDecl(T); | ||||
1876 | else if(const auto *R = dyn_cast<RecordDecl>(TmpD)) | ||||
1877 | DiagnoseUnusedNestedTypedefs(R); | ||||
1878 | } | ||||
1879 | } | ||||
1880 | |||||
1881 | /// DiagnoseUnusedDecl - Emit warnings about declarations that are not used | ||||
1882 | /// unless they are marked attr(unused). | ||||
1883 | void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { | ||||
1884 | if (!ShouldDiagnoseUnusedDecl(D)) | ||||
1885 | return; | ||||
1886 | |||||
1887 | if (auto *TD = dyn_cast<TypedefNameDecl>(D)) { | ||||
1888 | // typedefs can be referenced later on, so the diagnostics are emitted | ||||
1889 | // at end-of-translation-unit. | ||||
1890 | UnusedLocalTypedefNameCandidates.insert(TD); | ||||
1891 | return; | ||||
1892 | } | ||||
1893 | |||||
1894 | FixItHint Hint; | ||||
1895 | GenerateFixForUnusedDecl(D, Context, Hint); | ||||
1896 | |||||
1897 | unsigned DiagID; | ||||
1898 | if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) | ||||
1899 | DiagID = diag::warn_unused_exception_param; | ||||
1900 | else if (isa<LabelDecl>(D)) | ||||
1901 | DiagID = diag::warn_unused_label; | ||||
1902 | else | ||||
1903 | DiagID = diag::warn_unused_variable; | ||||
1904 | |||||
1905 | Diag(D->getLocation(), DiagID) << D << Hint; | ||||
1906 | } | ||||
1907 | |||||
1908 | static void CheckPoppedLabel(LabelDecl *L, Sema &S) { | ||||
1909 | // Verify that we have no forward references left. If so, there was a goto | ||||
1910 | // or address of a label taken, but no definition of it. Label fwd | ||||
1911 | // definitions are indicated with a null substmt which is also not a resolved | ||||
1912 | // MS inline assembly label name. | ||||
1913 | bool Diagnose = false; | ||||
1914 | if (L->isMSAsmLabel()) | ||||
1915 | Diagnose = !L->isResolvedMSAsmLabel(); | ||||
1916 | else | ||||
1917 | Diagnose = L->getStmt() == nullptr; | ||||
1918 | if (Diagnose) | ||||
1919 | S.Diag(L->getLocation(), diag::err_undeclared_label_use) << L; | ||||
1920 | } | ||||
1921 | |||||
1922 | void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { | ||||
1923 | S->mergeNRVOIntoParent(); | ||||
1924 | |||||
1925 | if (S->decl_empty()) return; | ||||
1926 | assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) &&(((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope )) && "Scope shouldn't contain decls!") ? static_cast <void> (0) : __assert_fail ("(S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && \"Scope shouldn't contain decls!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1927, __PRETTY_FUNCTION__)) | ||||
1927 | "Scope shouldn't contain decls!")(((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope )) && "Scope shouldn't contain decls!") ? static_cast <void> (0) : __assert_fail ("(S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && \"Scope shouldn't contain decls!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1927, __PRETTY_FUNCTION__)); | ||||
1928 | |||||
1929 | for (auto *TmpD : S->decls()) { | ||||
1930 | assert(TmpD && "This decl didn't get pushed??")((TmpD && "This decl didn't get pushed??") ? static_cast <void> (0) : __assert_fail ("TmpD && \"This decl didn't get pushed??\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1930, __PRETTY_FUNCTION__)); | ||||
1931 | |||||
1932 | assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?")((isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?" ) ? static_cast<void> (0) : __assert_fail ("isa<NamedDecl>(TmpD) && \"Decl isn't NamedDecl?\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 1932, __PRETTY_FUNCTION__)); | ||||
1933 | NamedDecl *D = cast<NamedDecl>(TmpD); | ||||
1934 | |||||
1935 | // Diagnose unused variables in this scope. | ||||
1936 | if (!S->hasUnrecoverableErrorOccurred()) { | ||||
1937 | DiagnoseUnusedDecl(D); | ||||
1938 | if (const auto *RD = dyn_cast<RecordDecl>(D)) | ||||
1939 | DiagnoseUnusedNestedTypedefs(RD); | ||||
1940 | } | ||||
1941 | |||||
1942 | if (!D->getDeclName()) continue; | ||||
1943 | |||||
1944 | // If this was a forward reference to a label, verify it was defined. | ||||
1945 | if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) | ||||
1946 | CheckPoppedLabel(LD, *this); | ||||
1947 | |||||
1948 | // Remove this name from our lexical scope, and warn on it if we haven't | ||||
1949 | // already. | ||||
1950 | IdResolver.RemoveDecl(D); | ||||
1951 | auto ShadowI = ShadowingDecls.find(D); | ||||
1952 | if (ShadowI != ShadowingDecls.end()) { | ||||
1953 | if (const auto *FD = dyn_cast<FieldDecl>(ShadowI->second)) { | ||||
1954 | Diag(D->getLocation(), diag::warn_ctor_parm_shadows_field) | ||||
1955 | << D << FD << FD->getParent(); | ||||
1956 | Diag(FD->getLocation(), diag::note_previous_declaration); | ||||
1957 | } | ||||
1958 | ShadowingDecls.erase(ShadowI); | ||||
1959 | } | ||||
1960 | } | ||||
1961 | } | ||||
1962 | |||||
1963 | /// Look for an Objective-C class in the translation unit. | ||||
1964 | /// | ||||
1965 | /// \param Id The name of the Objective-C class we're looking for. If | ||||
1966 | /// typo-correction fixes this name, the Id will be updated | ||||
1967 | /// to the fixed name. | ||||
1968 | /// | ||||
1969 | /// \param IdLoc The location of the name in the translation unit. | ||||
1970 | /// | ||||
1971 | /// \param DoTypoCorrection If true, this routine will attempt typo correction | ||||
1972 | /// if there is no class with the given name. | ||||
1973 | /// | ||||
1974 | /// \returns The declaration of the named Objective-C class, or NULL if the | ||||
1975 | /// class could not be found. | ||||
1976 | ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, | ||||
1977 | SourceLocation IdLoc, | ||||
1978 | bool DoTypoCorrection) { | ||||
1979 | // The third "scope" argument is 0 since we aren't enabling lazy built-in | ||||
1980 | // creation from this context. | ||||
1981 | NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); | ||||
1982 | |||||
1983 | if (!IDecl && DoTypoCorrection) { | ||||
1984 | // Perform typo correction at the given location, but only if we | ||||
1985 | // find an Objective-C class name. | ||||
1986 | DeclFilterCCC<ObjCInterfaceDecl> CCC{}; | ||||
1987 | if (TypoCorrection C = | ||||
1988 | CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, | ||||
1989 | TUScope, nullptr, CCC, CTK_ErrorRecovery)) { | ||||
1990 | diagnoseTypo(C, PDiag(diag::err_undef_interface_suggest) << Id); | ||||
1991 | IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); | ||||
1992 | Id = IDecl->getIdentifier(); | ||||
1993 | } | ||||
1994 | } | ||||
1995 | ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); | ||||
1996 | // This routine must always return a class definition, if any. | ||||
1997 | if (Def && Def->getDefinition()) | ||||
1998 | Def = Def->getDefinition(); | ||||
1999 | return Def; | ||||
2000 | } | ||||
2001 | |||||
2002 | /// getNonFieldDeclScope - Retrieves the innermost scope, starting | ||||
2003 | /// from S, where a non-field would be declared. This routine copes | ||||
2004 | /// with the difference between C and C++ scoping rules in structs and | ||||
2005 | /// unions. For example, the following code is well-formed in C but | ||||
2006 | /// ill-formed in C++: | ||||
2007 | /// @code | ||||
2008 | /// struct S6 { | ||||
2009 | /// enum { BAR } e; | ||||
2010 | /// }; | ||||
2011 | /// | ||||
2012 | /// void test_S6() { | ||||
2013 | /// struct S6 a; | ||||
2014 | /// a.e = BAR; | ||||
2015 | /// } | ||||
2016 | /// @endcode | ||||
2017 | /// For the declaration of BAR, this routine will return a different | ||||
2018 | /// scope. The scope S will be the scope of the unnamed enumeration | ||||
2019 | /// within S6. In C++, this routine will return the scope associated | ||||
2020 | /// with S6, because the enumeration's scope is a transparent | ||||
2021 | /// context but structures can contain non-field names. In C, this | ||||
2022 | /// routine will return the translation unit scope, since the | ||||
2023 | /// enumeration's scope is a transparent context and structures cannot | ||||
2024 | /// contain non-field names. | ||||
2025 | Scope *Sema::getNonFieldDeclScope(Scope *S) { | ||||
2026 | while (((S->getFlags() & Scope::DeclScope) == 0) || | ||||
2027 | (S->getEntity() && S->getEntity()->isTransparentContext()) || | ||||
2028 | (S->isClassScope() && !getLangOpts().CPlusPlus)) | ||||
2029 | S = S->getParent(); | ||||
2030 | return S; | ||||
2031 | } | ||||
2032 | |||||
2033 | static StringRef getHeaderName(Builtin::Context &BuiltinInfo, unsigned ID, | ||||
2034 | ASTContext::GetBuiltinTypeError Error) { | ||||
2035 | switch (Error) { | ||||
2036 | case ASTContext::GE_None: | ||||
2037 | return ""; | ||||
2038 | case ASTContext::GE_Missing_type: | ||||
2039 | return BuiltinInfo.getHeaderName(ID); | ||||
2040 | case ASTContext::GE_Missing_stdio: | ||||
2041 | return "stdio.h"; | ||||
2042 | case ASTContext::GE_Missing_setjmp: | ||||
2043 | return "setjmp.h"; | ||||
2044 | case ASTContext::GE_Missing_ucontext: | ||||
2045 | return "ucontext.h"; | ||||
2046 | } | ||||
2047 | llvm_unreachable("unhandled error kind")::llvm::llvm_unreachable_internal("unhandled error kind", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 2047); | ||||
2048 | } | ||||
2049 | |||||
2050 | FunctionDecl *Sema::CreateBuiltin(IdentifierInfo *II, QualType Type, | ||||
2051 | unsigned ID, SourceLocation Loc) { | ||||
2052 | DeclContext *Parent = Context.getTranslationUnitDecl(); | ||||
2053 | |||||
2054 | if (getLangOpts().CPlusPlus) { | ||||
2055 | LinkageSpecDecl *CLinkageDecl = LinkageSpecDecl::Create( | ||||
2056 | Context, Parent, Loc, Loc, LinkageSpecDecl::lang_c, false); | ||||
2057 | CLinkageDecl->setImplicit(); | ||||
2058 | Parent->addDecl(CLinkageDecl); | ||||
2059 | Parent = CLinkageDecl; | ||||
2060 | } | ||||
2061 | |||||
2062 | FunctionDecl *New = FunctionDecl::Create(Context, Parent, Loc, Loc, II, Type, | ||||
2063 | /*TInfo=*/nullptr, SC_Extern, false, | ||||
2064 | Type->isFunctionProtoType()); | ||||
2065 | New->setImplicit(); | ||||
2066 | New->addAttr(BuiltinAttr::CreateImplicit(Context, ID)); | ||||
2067 | |||||
2068 | // Create Decl objects for each parameter, adding them to the | ||||
2069 | // FunctionDecl. | ||||
2070 | if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(Type)) { | ||||
2071 | SmallVector<ParmVarDecl *, 16> Params; | ||||
2072 | for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) { | ||||
2073 | ParmVarDecl *parm = ParmVarDecl::Create( | ||||
2074 | Context, New, SourceLocation(), SourceLocation(), nullptr, | ||||
2075 | FT->getParamType(i), /*TInfo=*/nullptr, SC_None, nullptr); | ||||
2076 | parm->setScopeInfo(0, i); | ||||
2077 | Params.push_back(parm); | ||||
2078 | } | ||||
2079 | New->setParams(Params); | ||||
2080 | } | ||||
2081 | |||||
2082 | AddKnownFunctionAttributes(New); | ||||
2083 | return New; | ||||
2084 | } | ||||
2085 | |||||
2086 | /// LazilyCreateBuiltin - The specified Builtin-ID was first used at | ||||
2087 | /// file scope. lazily create a decl for it. ForRedeclaration is true | ||||
2088 | /// if we're creating this built-in in anticipation of redeclaring the | ||||
2089 | /// built-in. | ||||
2090 | NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned ID, | ||||
2091 | Scope *S, bool ForRedeclaration, | ||||
2092 | SourceLocation Loc) { | ||||
2093 | LookupNecessaryTypesForBuiltin(S, ID); | ||||
2094 | |||||
2095 | ASTContext::GetBuiltinTypeError Error; | ||||
2096 | QualType R = Context.GetBuiltinType(ID, Error); | ||||
2097 | if (Error) { | ||||
2098 | if (!ForRedeclaration) | ||||
2099 | return nullptr; | ||||
2100 | |||||
2101 | // If we have a builtin without an associated type we should not emit a | ||||
2102 | // warning when we were not able to find a type for it. | ||||
2103 | if (Error == ASTContext::GE_Missing_type || | ||||
2104 | Context.BuiltinInfo.allowTypeMismatch(ID)) | ||||
2105 | return nullptr; | ||||
2106 | |||||
2107 | // If we could not find a type for setjmp it is because the jmp_buf type was | ||||
2108 | // not defined prior to the setjmp declaration. | ||||
2109 | if (Error == ASTContext::GE_Missing_setjmp) { | ||||
2110 | Diag(Loc, diag::warn_implicit_decl_no_jmp_buf) | ||||
2111 | << Context.BuiltinInfo.getName(ID); | ||||
2112 | return nullptr; | ||||
2113 | } | ||||
2114 | |||||
2115 | // Generally, we emit a warning that the declaration requires the | ||||
2116 | // appropriate header. | ||||
2117 | Diag(Loc, diag::warn_implicit_decl_requires_sysheader) | ||||
2118 | << getHeaderName(Context.BuiltinInfo, ID, Error) | ||||
2119 | << Context.BuiltinInfo.getName(ID); | ||||
2120 | return nullptr; | ||||
2121 | } | ||||
2122 | |||||
2123 | if (!ForRedeclaration && | ||||
2124 | (Context.BuiltinInfo.isPredefinedLibFunction(ID) || | ||||
2125 | Context.BuiltinInfo.isHeaderDependentFunction(ID))) { | ||||
2126 | Diag(Loc, diag::ext_implicit_lib_function_decl) | ||||
2127 | << Context.BuiltinInfo.getName(ID) << R; | ||||
2128 | if (const char *Header = Context.BuiltinInfo.getHeaderName(ID)) | ||||
2129 | Diag(Loc, diag::note_include_header_or_declare) | ||||
2130 | << Header << Context.BuiltinInfo.getName(ID); | ||||
2131 | } | ||||
2132 | |||||
2133 | if (R.isNull()) | ||||
2134 | return nullptr; | ||||
2135 | |||||
2136 | FunctionDecl *New = CreateBuiltin(II, R, ID, Loc); | ||||
2137 | RegisterLocallyScopedExternCDecl(New, S); | ||||
2138 | |||||
2139 | // TUScope is the translation-unit scope to insert this function into. | ||||
2140 | // FIXME: This is hideous. We need to teach PushOnScopeChains to | ||||
2141 | // relate Scopes to DeclContexts, and probably eliminate CurContext | ||||
2142 | // entirely, but we're not there yet. | ||||
2143 | DeclContext *SavedContext = CurContext; | ||||
2144 | CurContext = New->getDeclContext(); | ||||
2145 | PushOnScopeChains(New, TUScope); | ||||
2146 | CurContext = SavedContext; | ||||
2147 | return New; | ||||
2148 | } | ||||
2149 | |||||
2150 | /// Typedef declarations don't have linkage, but they still denote the same | ||||
2151 | /// entity if their types are the same. | ||||
2152 | /// FIXME: This is notionally doing the same thing as ASTReaderDecl's | ||||
2153 | /// isSameEntity. | ||||
2154 | static void filterNonConflictingPreviousTypedefDecls(Sema &S, | ||||
2155 | TypedefNameDecl *Decl, | ||||
2156 | LookupResult &Previous) { | ||||
2157 | // This is only interesting when modules are enabled. | ||||
2158 | if (!S.getLangOpts().Modules && !S.getLangOpts().ModulesLocalVisibility) | ||||
2159 | return; | ||||
2160 | |||||
2161 | // Empty sets are uninteresting. | ||||
2162 | if (Previous.empty()) | ||||
2163 | return; | ||||
2164 | |||||
2165 | LookupResult::Filter Filter = Previous.makeFilter(); | ||||
2166 | while (Filter.hasNext()) { | ||||
2167 | NamedDecl *Old = Filter.next(); | ||||
2168 | |||||
2169 | // Non-hidden declarations are never ignored. | ||||
2170 | if (S.isVisible(Old)) | ||||
2171 | continue; | ||||
2172 | |||||
2173 | // Declarations of the same entity are not ignored, even if they have | ||||
2174 | // different linkages. | ||||
2175 | if (auto *OldTD = dyn_cast<TypedefNameDecl>(Old)) { | ||||
2176 | if (S.Context.hasSameType(OldTD->getUnderlyingType(), | ||||
2177 | Decl->getUnderlyingType())) | ||||
2178 | continue; | ||||
2179 | |||||
2180 | // If both declarations give a tag declaration a typedef name for linkage | ||||
2181 | // purposes, then they declare the same entity. | ||||
2182 | if (OldTD->getAnonDeclWithTypedefName(/*AnyRedecl*/true) && | ||||
2183 | Decl->getAnonDeclWithTypedefName()) | ||||
2184 | continue; | ||||
2185 | } | ||||
2186 | |||||
2187 | Filter.erase(); | ||||
2188 | } | ||||
2189 | |||||
2190 | Filter.done(); | ||||
2191 | } | ||||
2192 | |||||
2193 | bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { | ||||
2194 | QualType OldType; | ||||
2195 | if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) | ||||
2196 | OldType = OldTypedef->getUnderlyingType(); | ||||
2197 | else | ||||
2198 | OldType = Context.getTypeDeclType(Old); | ||||
2199 | QualType NewType = New->getUnderlyingType(); | ||||
2200 | |||||
2201 | if (NewType->isVariablyModifiedType()) { | ||||
2202 | // Must not redefine a typedef with a variably-modified type. | ||||
2203 | int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; | ||||
2204 | Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) | ||||
2205 | << Kind << NewType; | ||||
2206 | if (Old->getLocation().isValid()) | ||||
2207 | notePreviousDefinition(Old, New->getLocation()); | ||||
2208 | New->setInvalidDecl(); | ||||
2209 | return true; | ||||
2210 | } | ||||
2211 | |||||
2212 | if (OldType != NewType && | ||||
2213 | !OldType->isDependentType() && | ||||
2214 | !NewType->isDependentType() && | ||||
2215 | !Context.hasSameType(OldType, NewType)) { | ||||
2216 | int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; | ||||
2217 | Diag(New->getLocation(), diag::err_redefinition_different_typedef) | ||||
2218 | << Kind << NewType << OldType; | ||||
2219 | if (Old->getLocation().isValid()) | ||||
2220 | notePreviousDefinition(Old, New->getLocation()); | ||||
2221 | New->setInvalidDecl(); | ||||
2222 | return true; | ||||
2223 | } | ||||
2224 | return false; | ||||
2225 | } | ||||
2226 | |||||
2227 | /// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the | ||||
2228 | /// same name and scope as a previous declaration 'Old'. Figure out | ||||
2229 | /// how to resolve this situation, merging decls or emitting | ||||
2230 | /// diagnostics as appropriate. If there was an error, set New to be invalid. | ||||
2231 | /// | ||||
2232 | void Sema::MergeTypedefNameDecl(Scope *S, TypedefNameDecl *New, | ||||
2233 | LookupResult &OldDecls) { | ||||
2234 | // If the new decl is known invalid already, don't bother doing any | ||||
2235 | // merging checks. | ||||
2236 | if (New->isInvalidDecl()) return; | ||||
2237 | |||||
2238 | // Allow multiple definitions for ObjC built-in typedefs. | ||||
2239 | // FIXME: Verify the underlying types are equivalent! | ||||
2240 | if (getLangOpts().ObjC) { | ||||
2241 | const IdentifierInfo *TypeID = New->getIdentifier(); | ||||
2242 | switch (TypeID->getLength()) { | ||||
2243 | default: break; | ||||
2244 | case 2: | ||||
2245 | { | ||||
2246 | if (!TypeID->isStr("id")) | ||||
2247 | break; | ||||
2248 | QualType T = New->getUnderlyingType(); | ||||
2249 | if (!T->isPointerType()) | ||||
2250 | break; | ||||
2251 | if (!T->isVoidPointerType()) { | ||||
2252 | QualType PT = T->castAs<PointerType>()->getPointeeType(); | ||||
2253 | if (!PT->isStructureType()) | ||||
2254 | break; | ||||
2255 | } | ||||
2256 | Context.setObjCIdRedefinitionType(T); | ||||
2257 | // Install the built-in type for 'id', ignoring the current definition. | ||||
2258 | New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); | ||||
2259 | return; | ||||
2260 | } | ||||
2261 | case 5: | ||||
2262 | if (!TypeID->isStr("Class")) | ||||
2263 | break; | ||||
2264 | Context.setObjCClassRedefinitionType(New->getUnderlyingType()); | ||||
2265 | // Install the built-in type for 'Class', ignoring the current definition. | ||||
2266 | New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); | ||||
2267 | return; | ||||
2268 | case 3: | ||||
2269 | if (!TypeID->isStr("SEL")) | ||||
2270 | break; | ||||
2271 | Context.setObjCSelRedefinitionType(New->getUnderlyingType()); | ||||
2272 | // Install the built-in type for 'SEL', ignoring the current definition. | ||||
2273 | New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); | ||||
2274 | return; | ||||
2275 | } | ||||
2276 | // Fall through - the typedef name was not a builtin type. | ||||
2277 | } | ||||
2278 | |||||
2279 | // Verify the old decl was also a type. | ||||
2280 | TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); | ||||
2281 | if (!Old) { | ||||
2282 | Diag(New->getLocation(), diag::err_redefinition_different_kind) | ||||
2283 | << New->getDeclName(); | ||||
2284 | |||||
2285 | NamedDecl *OldD = OldDecls.getRepresentativeDecl(); | ||||
2286 | if (OldD->getLocation().isValid()) | ||||
2287 | notePreviousDefinition(OldD, New->getLocation()); | ||||
2288 | |||||
2289 | return New->setInvalidDecl(); | ||||
2290 | } | ||||
2291 | |||||
2292 | // If the old declaration is invalid, just give up here. | ||||
2293 | if (Old->isInvalidDecl()) | ||||
2294 | return New->setInvalidDecl(); | ||||
2295 | |||||
2296 | if (auto *OldTD = dyn_cast<TypedefNameDecl>(Old)) { | ||||
2297 | auto *OldTag = OldTD->getAnonDeclWithTypedefName(/*AnyRedecl*/true); | ||||
2298 | auto *NewTag = New->getAnonDeclWithTypedefName(); | ||||
2299 | NamedDecl *Hidden = nullptr; | ||||
2300 | if (OldTag && NewTag && | ||||
2301 | OldTag->getCanonicalDecl() != NewTag->getCanonicalDecl() && | ||||
2302 | !hasVisibleDefinition(OldTag, &Hidden)) { | ||||
2303 | // There is a definition of this tag, but it is not visible. Use it | ||||
2304 | // instead of our tag. | ||||
2305 | New->setTypeForDecl(OldTD->getTypeForDecl()); | ||||
2306 | if (OldTD->isModed()) | ||||
2307 | New->setModedTypeSourceInfo(OldTD->getTypeSourceInfo(), | ||||
2308 | OldTD->getUnderlyingType()); | ||||
2309 | else | ||||
2310 | New->setTypeSourceInfo(OldTD->getTypeSourceInfo()); | ||||
2311 | |||||
2312 | // Make the old tag definition visible. | ||||
2313 | makeMergedDefinitionVisible(Hidden); | ||||
2314 | |||||
2315 | // If this was an unscoped enumeration, yank all of its enumerators | ||||
2316 | // out of the scope. | ||||
2317 | if (isa<EnumDecl>(NewTag)) { | ||||
2318 | Scope *EnumScope = getNonFieldDeclScope(S); | ||||
2319 | for (auto *D : NewTag->decls()) { | ||||
2320 | auto *ED = cast<EnumConstantDecl>(D); | ||||
2321 | assert(EnumScope->isDeclScope(ED))((EnumScope->isDeclScope(ED)) ? static_cast<void> (0 ) : __assert_fail ("EnumScope->isDeclScope(ED)", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 2321, __PRETTY_FUNCTION__)); | ||||
2322 | EnumScope->RemoveDecl(ED); | ||||
2323 | IdResolver.RemoveDecl(ED); | ||||
2324 | ED->getLexicalDeclContext()->removeDecl(ED); | ||||
2325 | } | ||||
2326 | } | ||||
2327 | } | ||||
2328 | } | ||||
2329 | |||||
2330 | // If the typedef types are not identical, reject them in all languages and | ||||
2331 | // with any extensions enabled. | ||||
2332 | if (isIncompatibleTypedef(Old, New)) | ||||
2333 | return; | ||||
2334 | |||||
2335 | // The types match. Link up the redeclaration chain and merge attributes if | ||||
2336 | // the old declaration was a typedef. | ||||
2337 | if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) { | ||||
2338 | New->setPreviousDecl(Typedef); | ||||
2339 | mergeDeclAttributes(New, Old); | ||||
2340 | } | ||||
2341 | |||||
2342 | if (getLangOpts().MicrosoftExt) | ||||
2343 | return; | ||||
2344 | |||||
2345 | if (getLangOpts().CPlusPlus) { | ||||
2346 | // C++ [dcl.typedef]p2: | ||||
2347 | // In a given non-class scope, a typedef specifier can be used to | ||||
2348 | // redefine the name of any type declared in that scope to refer | ||||
2349 | // to the type to which it already refers. | ||||
2350 | if (!isa<CXXRecordDecl>(CurContext)) | ||||
2351 | return; | ||||
2352 | |||||
2353 | // C++0x [dcl.typedef]p4: | ||||
2354 | // In a given class scope, a typedef specifier can be used to redefine | ||||
2355 | // any class-name declared in that scope that is not also a typedef-name | ||||
2356 | // to refer to the type to which it already refers. | ||||
2357 | // | ||||
2358 | // This wording came in via DR424, which was a correction to the | ||||
2359 | // wording in DR56, which accidentally banned code like: | ||||
2360 | // | ||||
2361 | // struct S { | ||||
2362 | // typedef struct A { } A; | ||||
2363 | // }; | ||||
2364 | // | ||||
2365 | // in the C++03 standard. We implement the C++0x semantics, which | ||||
2366 | // allow the above but disallow | ||||
2367 | // | ||||
2368 | // struct S { | ||||
2369 | // typedef int I; | ||||
2370 | // typedef int I; | ||||
2371 | // }; | ||||
2372 | // | ||||
2373 | // since that was the intent of DR56. | ||||
2374 | if (!isa<TypedefNameDecl>(Old)) | ||||
2375 | return; | ||||
2376 | |||||
2377 | Diag(New->getLocation(), diag::err_redefinition) | ||||
2378 | << New->getDeclName(); | ||||
2379 | notePreviousDefinition(Old, New->getLocation()); | ||||
2380 | return New->setInvalidDecl(); | ||||
2381 | } | ||||
2382 | |||||
2383 | // Modules always permit redefinition of typedefs, as does C11. | ||||
2384 | if (getLangOpts().Modules || getLangOpts().C11) | ||||
2385 | return; | ||||
2386 | |||||
2387 | // If we have a redefinition of a typedef in C, emit a warning. This warning | ||||
2388 | // is normally mapped to an error, but can be controlled with | ||||
2389 | // -Wtypedef-redefinition. If either the original or the redefinition is | ||||
2390 | // in a system header, don't emit this for compatibility with GCC. | ||||
2391 | if (getDiagnostics().getSuppressSystemWarnings() && | ||||
2392 | // Some standard types are defined implicitly in Clang (e.g. OpenCL). | ||||
2393 | (Old->isImplicit() || | ||||
2394 | Context.getSourceManager().isInSystemHeader(Old->getLocation()) || | ||||
2395 | Context.getSourceManager().isInSystemHeader(New->getLocation()))) | ||||
2396 | return; | ||||
2397 | |||||
2398 | Diag(New->getLocation(), diag::ext_redefinition_of_typedef) | ||||
2399 | << New->getDeclName(); | ||||
2400 | notePreviousDefinition(Old, New->getLocation()); | ||||
2401 | } | ||||
2402 | |||||
2403 | /// DeclhasAttr - returns true if decl Declaration already has the target | ||||
2404 | /// attribute. | ||||
2405 | static bool DeclHasAttr(const Decl *D, const Attr *A) { | ||||
2406 | const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); | ||||
2407 | const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); | ||||
2408 | for (const auto *i : D->attrs()) | ||||
2409 | if (i->getKind() == A->getKind()) { | ||||
2410 | if (Ann) { | ||||
2411 | if (Ann->getAnnotation() == cast<AnnotateAttr>(i)->getAnnotation()) | ||||
2412 | return true; | ||||
2413 | continue; | ||||
2414 | } | ||||
2415 | // FIXME: Don't hardcode this check | ||||
2416 | if (OA && isa<OwnershipAttr>(i)) | ||||
2417 | return OA->getOwnKind() == cast<OwnershipAttr>(i)->getOwnKind(); | ||||
2418 | return true; | ||||
2419 | } | ||||
2420 | |||||
2421 | return false; | ||||
2422 | } | ||||
2423 | |||||
2424 | static bool isAttributeTargetADefinition(Decl *D) { | ||||
2425 | if (VarDecl *VD = dyn_cast<VarDecl>(D)) | ||||
2426 | return VD->isThisDeclarationADefinition(); | ||||
2427 | if (TagDecl *TD = dyn_cast<TagDecl>(D)) | ||||
2428 | return TD->isCompleteDefinition() || TD->isBeingDefined(); | ||||
2429 | return true; | ||||
2430 | } | ||||
2431 | |||||
2432 | /// Merge alignment attributes from \p Old to \p New, taking into account the | ||||
2433 | /// special semantics of C11's _Alignas specifier and C++11's alignas attribute. | ||||
2434 | /// | ||||
2435 | /// \return \c true if any attributes were added to \p New. | ||||
2436 | static bool mergeAlignedAttrs(Sema &S, NamedDecl *New, Decl *Old) { | ||||
2437 | // Look for alignas attributes on Old, and pick out whichever attribute | ||||
2438 | // specifies the strictest alignment requirement. | ||||
2439 | AlignedAttr *OldAlignasAttr = nullptr; | ||||
2440 | AlignedAttr *OldStrictestAlignAttr = nullptr; | ||||
2441 | unsigned OldAlign = 0; | ||||
2442 | for (auto *I : Old->specific_attrs<AlignedAttr>()) { | ||||
2443 | // FIXME: We have no way of representing inherited dependent alignments | ||||
2444 | // in a case like: | ||||
2445 | // template<int A, int B> struct alignas(A) X; | ||||
2446 | // template<int A, int B> struct alignas(B) X {}; | ||||
2447 | // For now, we just ignore any alignas attributes which are not on the | ||||
2448 | // definition in such a case. | ||||
2449 | if (I->isAlignmentDependent()) | ||||
2450 | return false; | ||||
2451 | |||||
2452 | if (I->isAlignas()) | ||||
2453 | OldAlignasAttr = I; | ||||
2454 | |||||
2455 | unsigned Align = I->getAlignment(S.Context); | ||||
2456 | if (Align > OldAlign) { | ||||
2457 | OldAlign = Align; | ||||
2458 | OldStrictestAlignAttr = I; | ||||
2459 | } | ||||
2460 | } | ||||
2461 | |||||
2462 | // Look for alignas attributes on New. | ||||
2463 | AlignedAttr *NewAlignasAttr = nullptr; | ||||
2464 | unsigned NewAlign = 0; | ||||
2465 | for (auto *I : New->specific_attrs<AlignedAttr>()) { | ||||
2466 | if (I->isAlignmentDependent()) | ||||
2467 | return false; | ||||
2468 | |||||
2469 | if (I->isAlignas()) | ||||
2470 | NewAlignasAttr = I; | ||||
2471 | |||||
2472 | unsigned Align = I->getAlignment(S.Context); | ||||
2473 | if (Align > NewAlign) | ||||
2474 | NewAlign = Align; | ||||
2475 | } | ||||
2476 | |||||
2477 | if (OldAlignasAttr && NewAlignasAttr && OldAlign != NewAlign) { | ||||
2478 | // Both declarations have 'alignas' attributes. We require them to match. | ||||
2479 | // C++11 [dcl.align]p6 and C11 6.7.5/7 both come close to saying this, but | ||||
2480 | // fall short. (If two declarations both have alignas, they must both match | ||||
2481 | // every definition, and so must match each other if there is a definition.) | ||||
2482 | |||||
2483 | // If either declaration only contains 'alignas(0)' specifiers, then it | ||||
2484 | // specifies the natural alignment for the type. | ||||
2485 | if (OldAlign == 0 || NewAlign == 0) { | ||||
2486 | QualType Ty; | ||||
2487 | if (ValueDecl *VD = dyn_cast<ValueDecl>(New)) | ||||
2488 | Ty = VD->getType(); | ||||
2489 | else | ||||
2490 | Ty = S.Context.getTagDeclType(cast<TagDecl>(New)); | ||||
2491 | |||||
2492 | if (OldAlign == 0) | ||||
2493 | OldAlign = S.Context.getTypeAlign(Ty); | ||||
2494 | if (NewAlign == 0) | ||||
2495 | NewAlign = S.Context.getTypeAlign(Ty); | ||||
2496 | } | ||||
2497 | |||||
2498 | if (OldAlign != NewAlign) { | ||||
2499 | S.Diag(NewAlignasAttr->getLocation(), diag::err_alignas_mismatch) | ||||
2500 | << (unsigned)S.Context.toCharUnitsFromBits(OldAlign).getQuantity() | ||||
2501 | << (unsigned)S.Context.toCharUnitsFromBits(NewAlign).getQuantity(); | ||||
2502 | S.Diag(OldAlignasAttr->getLocation(), diag::note_previous_declaration); | ||||
2503 | } | ||||
2504 | } | ||||
2505 | |||||
2506 | if (OldAlignasAttr && !NewAlignasAttr && isAttributeTargetADefinition(New)) { | ||||
2507 | // C++11 [dcl.align]p6: | ||||
2508 | // if any declaration of an entity has an alignment-specifier, | ||||
2509 | // every defining declaration of that entity shall specify an | ||||
2510 | // equivalent alignment. | ||||
2511 | // C11 6.7.5/7: | ||||
2512 | // If the definition of an object does not have an alignment | ||||
2513 | // specifier, any other declaration of that object shall also | ||||
2514 | // have no alignment specifier. | ||||
2515 | S.Diag(New->getLocation(), diag::err_alignas_missing_on_definition) | ||||
2516 | << OldAlignasAttr; | ||||
2517 | S.Diag(OldAlignasAttr->getLocation(), diag::note_alignas_on_declaration) | ||||
2518 | << OldAlignasAttr; | ||||
2519 | } | ||||
2520 | |||||
2521 | bool AnyAdded = false; | ||||
2522 | |||||
2523 | // Ensure we have an attribute representing the strictest alignment. | ||||
2524 | if (OldAlign > NewAlign) { | ||||
2525 | AlignedAttr *Clone = OldStrictestAlignAttr->clone(S.Context); | ||||
2526 | Clone->setInherited(true); | ||||
2527 | New->addAttr(Clone); | ||||
2528 | AnyAdded = true; | ||||
2529 | } | ||||
2530 | |||||
2531 | // Ensure we have an alignas attribute if the old declaration had one. | ||||
2532 | if (OldAlignasAttr && !NewAlignasAttr && | ||||
2533 | !(AnyAdded && OldStrictestAlignAttr->isAlignas())) { | ||||
2534 | AlignedAttr *Clone = OldAlignasAttr->clone(S.Context); | ||||
2535 | Clone->setInherited(true); | ||||
2536 | New->addAttr(Clone); | ||||
2537 | AnyAdded = true; | ||||
2538 | } | ||||
2539 | |||||
2540 | return AnyAdded; | ||||
2541 | } | ||||
2542 | |||||
2543 | static bool mergeDeclAttribute(Sema &S, NamedDecl *D, | ||||
2544 | const InheritableAttr *Attr, | ||||
2545 | Sema::AvailabilityMergeKind AMK) { | ||||
2546 | // This function copies an attribute Attr from a previous declaration to the | ||||
2547 | // new declaration D if the new declaration doesn't itself have that attribute | ||||
2548 | // yet or if that attribute allows duplicates. | ||||
2549 | // If you're adding a new attribute that requires logic different from | ||||
2550 | // "use explicit attribute on decl if present, else use attribute from | ||||
2551 | // previous decl", for example if the attribute needs to be consistent | ||||
2552 | // between redeclarations, you need to call a custom merge function here. | ||||
2553 | InheritableAttr *NewAttr = nullptr; | ||||
2554 | if (const auto *AA = dyn_cast<AvailabilityAttr>(Attr)) | ||||
2555 | NewAttr = S.mergeAvailabilityAttr( | ||||
2556 | D, *AA, AA->getPlatform(), AA->isImplicit(), AA->getIntroduced(), | ||||
2557 | AA->getDeprecated(), AA->getObsoleted(), AA->getUnavailable(), | ||||
2558 | AA->getMessage(), AA->getStrict(), AA->getReplacement(), AMK, | ||||
2559 | AA->getPriority()); | ||||
2560 | else if (const auto *VA = dyn_cast<VisibilityAttr>(Attr)) | ||||
2561 | NewAttr = S.mergeVisibilityAttr(D, *VA, VA->getVisibility()); | ||||
2562 | else if (const auto *VA = dyn_cast<TypeVisibilityAttr>(Attr)) | ||||
2563 | NewAttr = S.mergeTypeVisibilityAttr(D, *VA, VA->getVisibility()); | ||||
2564 | else if (const auto *ImportA = dyn_cast<DLLImportAttr>(Attr)) | ||||
2565 | NewAttr = S.mergeDLLImportAttr(D, *ImportA); | ||||
2566 | else if (const auto *ExportA = dyn_cast<DLLExportAttr>(Attr)) | ||||
2567 | NewAttr = S.mergeDLLExportAttr(D, *ExportA); | ||||
2568 | else if (const auto *FA = dyn_cast<FormatAttr>(Attr)) | ||||
2569 | NewAttr = S.mergeFormatAttr(D, *FA, FA->getType(), FA->getFormatIdx(), | ||||
2570 | FA->getFirstArg()); | ||||
2571 | else if (const auto *SA = dyn_cast<SectionAttr>(Attr)) | ||||
2572 | NewAttr = S.mergeSectionAttr(D, *SA, SA->getName()); | ||||
2573 | else if (const auto *CSA = dyn_cast<CodeSegAttr>(Attr)) | ||||
2574 | NewAttr = S.mergeCodeSegAttr(D, *CSA, CSA->getName()); | ||||
2575 | else if (const auto *IA = dyn_cast<MSInheritanceAttr>(Attr)) | ||||
2576 | NewAttr = S.mergeMSInheritanceAttr(D, *IA, IA->getBestCase(), | ||||
2577 | IA->getInheritanceModel()); | ||||
2578 | else if (const auto *AA = dyn_cast<AlwaysInlineAttr>(Attr)) | ||||
2579 | NewAttr = S.mergeAlwaysInlineAttr(D, *AA, | ||||
2580 | &S.Context.Idents.get(AA->getSpelling())); | ||||
2581 | else if (S.getLangOpts().CUDA && isa<FunctionDecl>(D) && | ||||
2582 | (isa<CUDAHostAttr>(Attr) || isa<CUDADeviceAttr>(Attr) || | ||||
2583 | isa<CUDAGlobalAttr>(Attr))) { | ||||
2584 | // CUDA target attributes are part of function signature for | ||||
2585 | // overloading purposes and must not be merged. | ||||
2586 | return false; | ||||
2587 | } else if (const auto *MA = dyn_cast<MinSizeAttr>(Attr)) | ||||
2588 | NewAttr = S.mergeMinSizeAttr(D, *MA); | ||||
2589 | else if (const auto *SNA = dyn_cast<SwiftNameAttr>(Attr)) | ||||
2590 | NewAttr = S.mergeSwiftNameAttr(D, *SNA, SNA->getName()); | ||||
2591 | else if (const auto *OA = dyn_cast<OptimizeNoneAttr>(Attr)) | ||||
2592 | NewAttr = S.mergeOptimizeNoneAttr(D, *OA); | ||||
2593 | else if (const auto *InternalLinkageA = dyn_cast<InternalLinkageAttr>(Attr)) | ||||
2594 | NewAttr = S.mergeInternalLinkageAttr(D, *InternalLinkageA); | ||||
2595 | else if (const auto *CommonA = dyn_cast<CommonAttr>(Attr)) | ||||
2596 | NewAttr = S.mergeCommonAttr(D, *CommonA); | ||||
2597 | else if (isa<AlignedAttr>(Attr)) | ||||
2598 | // AlignedAttrs are handled separately, because we need to handle all | ||||
2599 | // such attributes on a declaration at the same time. | ||||
2600 | NewAttr = nullptr; | ||||
2601 | else if ((isa<DeprecatedAttr>(Attr) || isa<UnavailableAttr>(Attr)) && | ||||
2602 | (AMK == Sema::AMK_Override || | ||||
2603 | AMK == Sema::AMK_ProtocolImplementation)) | ||||
2604 | NewAttr = nullptr; | ||||
2605 | else if (const auto *UA = dyn_cast<UuidAttr>(Attr)) | ||||
2606 | NewAttr = S.mergeUuidAttr(D, *UA, UA->getGuid(), UA->getGuidDecl()); | ||||
2607 | else if (const auto *SLHA = dyn_cast<SpeculativeLoadHardeningAttr>(Attr)) | ||||
2608 | NewAttr = S.mergeSpeculativeLoadHardeningAttr(D, *SLHA); | ||||
2609 | else if (const auto *SLHA = dyn_cast<NoSpeculativeLoadHardeningAttr>(Attr)) | ||||
2610 | NewAttr = S.mergeNoSpeculativeLoadHardeningAttr(D, *SLHA); | ||||
2611 | else if (const auto *IMA = dyn_cast<WebAssemblyImportModuleAttr>(Attr)) | ||||
2612 | NewAttr = S.mergeImportModuleAttr(D, *IMA); | ||||
2613 | else if (const auto *INA = dyn_cast<WebAssemblyImportNameAttr>(Attr)) | ||||
2614 | NewAttr = S.mergeImportNameAttr(D, *INA); | ||||
2615 | else if (const auto *TCBA = dyn_cast<EnforceTCBAttr>(Attr)) | ||||
2616 | NewAttr = S.mergeEnforceTCBAttr(D, *TCBA); | ||||
2617 | else if (const auto *TCBLA = dyn_cast<EnforceTCBLeafAttr>(Attr)) | ||||
2618 | NewAttr = S.mergeEnforceTCBLeafAttr(D, *TCBLA); | ||||
2619 | else if (Attr->shouldInheritEvenIfAlreadyPresent() || !DeclHasAttr(D, Attr)) | ||||
2620 | NewAttr = cast<InheritableAttr>(Attr->clone(S.Context)); | ||||
2621 | |||||
2622 | if (NewAttr) { | ||||
2623 | NewAttr->setInherited(true); | ||||
2624 | D->addAttr(NewAttr); | ||||
2625 | if (isa<MSInheritanceAttr>(NewAttr)) | ||||
2626 | S.Consumer.AssignInheritanceModel(cast<CXXRecordDecl>(D)); | ||||
2627 | return true; | ||||
2628 | } | ||||
2629 | |||||
2630 | return false; | ||||
2631 | } | ||||
2632 | |||||
2633 | static const NamedDecl *getDefinition(const Decl *D) { | ||||
2634 | if (const TagDecl *TD = dyn_cast<TagDecl>(D)) | ||||
2635 | return TD->getDefinition(); | ||||
2636 | if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { | ||||
2637 | const VarDecl *Def = VD->getDefinition(); | ||||
2638 | if (Def) | ||||
2639 | return Def; | ||||
2640 | return VD->getActingDefinition(); | ||||
2641 | } | ||||
2642 | if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { | ||||
2643 | const FunctionDecl *Def = nullptr; | ||||
2644 | if (FD->isDefined(Def, true)) | ||||
2645 | return Def; | ||||
2646 | } | ||||
2647 | return nullptr; | ||||
2648 | } | ||||
2649 | |||||
2650 | static bool hasAttribute(const Decl *D, attr::Kind Kind) { | ||||
2651 | for (const auto *Attribute : D->attrs()) | ||||
2652 | if (Attribute->getKind() == Kind) | ||||
2653 | return true; | ||||
2654 | return false; | ||||
2655 | } | ||||
2656 | |||||
2657 | /// checkNewAttributesAfterDef - If we already have a definition, check that | ||||
2658 | /// there are no new attributes in this declaration. | ||||
2659 | static void checkNewAttributesAfterDef(Sema &S, Decl *New, const Decl *Old) { | ||||
2660 | if (!New->hasAttrs()) | ||||
2661 | return; | ||||
2662 | |||||
2663 | const NamedDecl *Def = getDefinition(Old); | ||||
2664 | if (!Def || Def == New) | ||||
2665 | return; | ||||
2666 | |||||
2667 | AttrVec &NewAttributes = New->getAttrs(); | ||||
2668 | for (unsigned I = 0, E = NewAttributes.size(); I != E;) { | ||||
2669 | const Attr *NewAttribute = NewAttributes[I]; | ||||
2670 | |||||
2671 | if (isa<AliasAttr>(NewAttribute) || isa<IFuncAttr>(NewAttribute)) { | ||||
2672 | if (FunctionDecl *FD = dyn_cast<FunctionDecl>(New)) { | ||||
2673 | Sema::SkipBodyInfo SkipBody; | ||||
2674 | S.CheckForFunctionRedefinition(FD, cast<FunctionDecl>(Def), &SkipBody); | ||||
2675 | |||||
2676 | // If we're skipping this definition, drop the "alias" attribute. | ||||
2677 | if (SkipBody.ShouldSkip) { | ||||
2678 | NewAttributes.erase(NewAttributes.begin() + I); | ||||
2679 | --E; | ||||
2680 | continue; | ||||
2681 | } | ||||
2682 | } else { | ||||
2683 | VarDecl *VD = cast<VarDecl>(New); | ||||
2684 | unsigned Diag = cast<VarDecl>(Def)->isThisDeclarationADefinition() == | ||||
2685 | VarDecl::TentativeDefinition | ||||
2686 | ? diag::err_alias_after_tentative | ||||
2687 | : diag::err_redefinition; | ||||
2688 | S.Diag(VD->getLocation(), Diag) << VD->getDeclName(); | ||||
2689 | if (Diag == diag::err_redefinition) | ||||
2690 | S.notePreviousDefinition(Def, VD->getLocation()); | ||||
2691 | else | ||||
2692 | S.Diag(Def->getLocation(), diag::note_previous_definition); | ||||
2693 | VD->setInvalidDecl(); | ||||
2694 | } | ||||
2695 | ++I; | ||||
2696 | continue; | ||||
2697 | } | ||||
2698 | |||||
2699 | if (const VarDecl *VD = dyn_cast<VarDecl>(Def)) { | ||||
2700 | // Tentative definitions are only interesting for the alias check above. | ||||
2701 | if (VD->isThisDeclarationADefinition() != VarDecl::Definition) { | ||||
2702 | ++I; | ||||
2703 | continue; | ||||
2704 | } | ||||
2705 | } | ||||
2706 | |||||
2707 | if (hasAttribute(Def, NewAttribute->getKind())) { | ||||
2708 | ++I; | ||||
2709 | continue; // regular attr merging will take care of validating this. | ||||
2710 | } | ||||
2711 | |||||
2712 | if (isa<C11NoReturnAttr>(NewAttribute)) { | ||||
2713 | // C's _Noreturn is allowed to be added to a function after it is defined. | ||||
2714 | ++I; | ||||
2715 | continue; | ||||
2716 | } else if (isa<UuidAttr>(NewAttribute)) { | ||||
2717 | // msvc will allow a subsequent definition to add an uuid to a class | ||||
2718 | ++I; | ||||
2719 | continue; | ||||
2720 | } else if (const AlignedAttr *AA = dyn_cast<AlignedAttr>(NewAttribute)) { | ||||
2721 | if (AA->isAlignas()) { | ||||
2722 | // C++11 [dcl.align]p6: | ||||
2723 | // if any declaration of an entity has an alignment-specifier, | ||||
2724 | // every defining declaration of that entity shall specify an | ||||
2725 | // equivalent alignment. | ||||
2726 | // C11 6.7.5/7: | ||||
2727 | // If the definition of an object does not have an alignment | ||||
2728 | // specifier, any other declaration of that object shall also | ||||
2729 | // have no alignment specifier. | ||||
2730 | S.Diag(Def->getLocation(), diag::err_alignas_missing_on_definition) | ||||
2731 | << AA; | ||||
2732 | S.Diag(NewAttribute->getLocation(), diag::note_alignas_on_declaration) | ||||
2733 | << AA; | ||||
2734 | NewAttributes.erase(NewAttributes.begin() + I); | ||||
2735 | --E; | ||||
2736 | continue; | ||||
2737 | } | ||||
2738 | } else if (isa<LoaderUninitializedAttr>(NewAttribute)) { | ||||
2739 | // If there is a C definition followed by a redeclaration with this | ||||
2740 | // attribute then there are two different definitions. In C++, prefer the | ||||
2741 | // standard diagnostics. | ||||
2742 | if (!S.getLangOpts().CPlusPlus) { | ||||
2743 | S.Diag(NewAttribute->getLocation(), | ||||
2744 | diag::err_loader_uninitialized_redeclaration); | ||||
2745 | S.Diag(Def->getLocation(), diag::note_previous_definition); | ||||
2746 | NewAttributes.erase(NewAttributes.begin() + I); | ||||
2747 | --E; | ||||
2748 | continue; | ||||
2749 | } | ||||
2750 | } else if (isa<SelectAnyAttr>(NewAttribute) && | ||||
2751 | cast<VarDecl>(New)->isInline() && | ||||
2752 | !cast<VarDecl>(New)->isInlineSpecified()) { | ||||
2753 | // Don't warn about applying selectany to implicitly inline variables. | ||||
2754 | // Older compilers and language modes would require the use of selectany | ||||
2755 | // to make such variables inline, and it would have no effect if we | ||||
2756 | // honored it. | ||||
2757 | ++I; | ||||
2758 | continue; | ||||
2759 | } else if (isa<OMPDeclareVariantAttr>(NewAttribute)) { | ||||
2760 | // We allow to add OMP[Begin]DeclareVariantAttr to be added to | ||||
2761 | // declarations after defintions. | ||||
2762 | ++I; | ||||
2763 | continue; | ||||
2764 | } | ||||
2765 | |||||
2766 | S.Diag(NewAttribute->getLocation(), | ||||
2767 | diag::warn_attribute_precede_definition); | ||||
2768 | S.Diag(Def->getLocation(), diag::note_previous_definition); | ||||
2769 | NewAttributes.erase(NewAttributes.begin() + I); | ||||
2770 | --E; | ||||
2771 | } | ||||
2772 | } | ||||
2773 | |||||
2774 | static void diagnoseMissingConstinit(Sema &S, const VarDecl *InitDecl, | ||||
2775 | const ConstInitAttr *CIAttr, | ||||
2776 | bool AttrBeforeInit) { | ||||
2777 | SourceLocation InsertLoc = InitDecl->getInnerLocStart(); | ||||
2778 | |||||
2779 | // Figure out a good way to write this specifier on the old declaration. | ||||
2780 | // FIXME: We should just use the spelling of CIAttr, but we don't preserve | ||||
2781 | // enough of the attribute list spelling information to extract that without | ||||
2782 | // heroics. | ||||
2783 | std::string SuitableSpelling; | ||||
2784 | if (S.getLangOpts().CPlusPlus20) | ||||
2785 | SuitableSpelling = std::string( | ||||
2786 | S.PP.getLastMacroWithSpelling(InsertLoc, {tok::kw_constinit})); | ||||
2787 | if (SuitableSpelling.empty() && S.getLangOpts().CPlusPlus11) | ||||
2788 | SuitableSpelling = std::string(S.PP.getLastMacroWithSpelling( | ||||
2789 | InsertLoc, {tok::l_square, tok::l_square, | ||||
2790 | S.PP.getIdentifierInfo("clang"), tok::coloncolon, | ||||
2791 | S.PP.getIdentifierInfo("require_constant_initialization"), | ||||
2792 | tok::r_square, tok::r_square})); | ||||
2793 | if (SuitableSpelling.empty()) | ||||
2794 | SuitableSpelling = std::string(S.PP.getLastMacroWithSpelling( | ||||
2795 | InsertLoc, {tok::kw___attribute, tok::l_paren, tok::r_paren, | ||||
2796 | S.PP.getIdentifierInfo("require_constant_initialization"), | ||||
2797 | tok::r_paren, tok::r_paren})); | ||||
2798 | if (SuitableSpelling.empty() && S.getLangOpts().CPlusPlus20) | ||||
2799 | SuitableSpelling = "constinit"; | ||||
2800 | if (SuitableSpelling.empty() && S.getLangOpts().CPlusPlus11) | ||||
2801 | SuitableSpelling = "[[clang::require_constant_initialization]]"; | ||||
2802 | if (SuitableSpelling.empty()) | ||||
2803 | SuitableSpelling = "__attribute__((require_constant_initialization))"; | ||||
2804 | SuitableSpelling += " "; | ||||
2805 | |||||
2806 | if (AttrBeforeInit) { | ||||
2807 | // extern constinit int a; | ||||
2808 | // int a = 0; // error (missing 'constinit'), accepted as extension | ||||
2809 | assert(CIAttr->isConstinit() && "should not diagnose this for attribute")((CIAttr->isConstinit() && "should not diagnose this for attribute" ) ? static_cast<void> (0) : __assert_fail ("CIAttr->isConstinit() && \"should not diagnose this for attribute\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 2809, __PRETTY_FUNCTION__)); | ||||
2810 | S.Diag(InitDecl->getLocation(), diag::ext_constinit_missing) | ||||
2811 | << InitDecl << FixItHint::CreateInsertion(InsertLoc, SuitableSpelling); | ||||
2812 | S.Diag(CIAttr->getLocation(), diag::note_constinit_specified_here); | ||||
2813 | } else { | ||||
2814 | // int a = 0; | ||||
2815 | // constinit extern int a; // error (missing 'constinit') | ||||
2816 | S.Diag(CIAttr->getLocation(), | ||||
2817 | CIAttr->isConstinit() ? diag::err_constinit_added_too_late | ||||
2818 | : diag::warn_require_const_init_added_too_late) | ||||
2819 | << FixItHint::CreateRemoval(SourceRange(CIAttr->getLocation())); | ||||
2820 | S.Diag(InitDecl->getLocation(), diag::note_constinit_missing_here) | ||||
2821 | << CIAttr->isConstinit() | ||||
2822 | << FixItHint::CreateInsertion(InsertLoc, SuitableSpelling); | ||||
2823 | } | ||||
2824 | } | ||||
2825 | |||||
2826 | /// mergeDeclAttributes - Copy attributes from the Old decl to the New one. | ||||
2827 | void Sema::mergeDeclAttributes(NamedDecl *New, Decl *Old, | ||||
2828 | AvailabilityMergeKind AMK) { | ||||
2829 | if (UsedAttr *OldAttr = Old->getMostRecentDecl()->getAttr<UsedAttr>()) { | ||||
2830 | UsedAttr *NewAttr = OldAttr->clone(Context); | ||||
2831 | NewAttr->setInherited(true); | ||||
2832 | New->addAttr(NewAttr); | ||||
2833 | } | ||||
2834 | |||||
2835 | if (!Old->hasAttrs() && !New->hasAttrs()) | ||||
2836 | return; | ||||
2837 | |||||
2838 | // [dcl.constinit]p1: | ||||
2839 | // If the [constinit] specifier is applied to any declaration of a | ||||
2840 | // variable, it shall be applied to the initializing declaration. | ||||
2841 | const auto *OldConstInit = Old->getAttr<ConstInitAttr>(); | ||||
2842 | const auto *NewConstInit = New->getAttr<ConstInitAttr>(); | ||||
2843 | if (bool(OldConstInit) != bool(NewConstInit)) { | ||||
2844 | const auto *OldVD = cast<VarDecl>(Old); | ||||
2845 | auto *NewVD = cast<VarDecl>(New); | ||||
2846 | |||||
2847 | // Find the initializing declaration. Note that we might not have linked | ||||
2848 | // the new declaration into the redeclaration chain yet. | ||||
2849 | const VarDecl *InitDecl = OldVD->getInitializingDeclaration(); | ||||
2850 | if (!InitDecl && | ||||
2851 | (NewVD->hasInit() || NewVD->isThisDeclarationADefinition())) | ||||
2852 | InitDecl = NewVD; | ||||
2853 | |||||
2854 | if (InitDecl == NewVD) { | ||||
2855 | // This is the initializing declaration. If it would inherit 'constinit', | ||||
2856 | // that's ill-formed. (Note that we do not apply this to the attribute | ||||
2857 | // form). | ||||
2858 | if (OldConstInit && OldConstInit->isConstinit()) | ||||
2859 | diagnoseMissingConstinit(*this, NewVD, OldConstInit, | ||||
2860 | /*AttrBeforeInit=*/true); | ||||
2861 | } else if (NewConstInit) { | ||||
2862 | // This is the first time we've been told that this declaration should | ||||
2863 | // have a constant initializer. If we already saw the initializing | ||||
2864 | // declaration, this is too late. | ||||
2865 | if (InitDecl && InitDecl != NewVD) { | ||||
2866 | diagnoseMissingConstinit(*this, InitDecl, NewConstInit, | ||||
2867 | /*AttrBeforeInit=*/false); | ||||
2868 | NewVD->dropAttr<ConstInitAttr>(); | ||||
2869 | } | ||||
2870 | } | ||||
2871 | } | ||||
2872 | |||||
2873 | // Attributes declared post-definition are currently ignored. | ||||
2874 | checkNewAttributesAfterDef(*this, New, Old); | ||||
2875 | |||||
2876 | if (AsmLabelAttr *NewA = New->getAttr<AsmLabelAttr>()) { | ||||
2877 | if (AsmLabelAttr *OldA = Old->getAttr<AsmLabelAttr>()) { | ||||
2878 | if (!OldA->isEquivalent(NewA)) { | ||||
2879 | // This redeclaration changes __asm__ label. | ||||
2880 | Diag(New->getLocation(), diag::err_different_asm_label); | ||||
2881 | Diag(OldA->getLocation(), diag::note_previous_declaration); | ||||
2882 | } | ||||
2883 | } else if (Old->isUsed()) { | ||||
2884 | // This redeclaration adds an __asm__ label to a declaration that has | ||||
2885 | // already been ODR-used. | ||||
2886 | Diag(New->getLocation(), diag::err_late_asm_label_name) | ||||
2887 | << isa<FunctionDecl>(Old) << New->getAttr<AsmLabelAttr>()->getRange(); | ||||
2888 | } | ||||
2889 | } | ||||
2890 | |||||
2891 | // Re-declaration cannot add abi_tag's. | ||||
2892 | if (const auto *NewAbiTagAttr = New->getAttr<AbiTagAttr>()) { | ||||
2893 | if (const auto *OldAbiTagAttr = Old->getAttr<AbiTagAttr>()) { | ||||
2894 | for (const auto &NewTag : NewAbiTagAttr->tags()) { | ||||
2895 | if (std::find(OldAbiTagAttr->tags_begin(), OldAbiTagAttr->tags_end(), | ||||
2896 | NewTag) == OldAbiTagAttr->tags_end()) { | ||||
2897 | Diag(NewAbiTagAttr->getLocation(), | ||||
2898 | diag::err_new_abi_tag_on_redeclaration) | ||||
2899 | << NewTag; | ||||
2900 | Diag(OldAbiTagAttr->getLocation(), diag::note_previous_declaration); | ||||
2901 | } | ||||
2902 | } | ||||
2903 | } else { | ||||
2904 | Diag(NewAbiTagAttr->getLocation(), diag::err_abi_tag_on_redeclaration); | ||||
2905 | Diag(Old->getLocation(), diag::note_previous_declaration); | ||||
2906 | } | ||||
2907 | } | ||||
2908 | |||||
2909 | // This redeclaration adds a section attribute. | ||||
2910 | if (New->hasAttr<SectionAttr>() && !Old->hasAttr<SectionAttr>()) { | ||||
2911 | if (auto *VD = dyn_cast<VarDecl>(New)) { | ||||
2912 | if (VD->isThisDeclarationADefinition() == VarDecl::DeclarationOnly) { | ||||
2913 | Diag(New->getLocation(), diag::warn_attribute_section_on_redeclaration); | ||||
2914 | Diag(Old->getLocation(), diag::note_previous_declaration); | ||||
2915 | } | ||||
2916 | } | ||||
2917 | } | ||||
2918 | |||||
2919 | // Redeclaration adds code-seg attribute. | ||||
2920 | const auto *NewCSA = New->getAttr<CodeSegAttr>(); | ||||
2921 | if (NewCSA && !Old->hasAttr<CodeSegAttr>() && | ||||
2922 | !NewCSA->isImplicit() && isa<CXXMethodDecl>(New)) { | ||||
2923 | Diag(New->getLocation(), diag::warn_mismatched_section) | ||||
2924 | << 0 /*codeseg*/; | ||||
2925 | Diag(Old->getLocation(), diag::note_previous_declaration); | ||||
2926 | } | ||||
2927 | |||||
2928 | if (!Old->hasAttrs()) | ||||
2929 | return; | ||||
2930 | |||||
2931 | bool foundAny = New->hasAttrs(); | ||||
2932 | |||||
2933 | // Ensure that any moving of objects within the allocated map is done before | ||||
2934 | // we process them. | ||||
2935 | if (!foundAny) New->setAttrs(AttrVec()); | ||||
2936 | |||||
2937 | for (auto *I : Old->specific_attrs<InheritableAttr>()) { | ||||
2938 | // Ignore deprecated/unavailable/availability attributes if requested. | ||||
2939 | AvailabilityMergeKind LocalAMK = AMK_None; | ||||
2940 | if (isa<DeprecatedAttr>(I) || | ||||
2941 | isa<UnavailableAttr>(I) || | ||||
2942 | isa<AvailabilityAttr>(I)) { | ||||
2943 | switch (AMK) { | ||||
2944 | case AMK_None: | ||||
2945 | continue; | ||||
2946 | |||||
2947 | case AMK_Redeclaration: | ||||
2948 | case AMK_Override: | ||||
2949 | case AMK_ProtocolImplementation: | ||||
2950 | LocalAMK = AMK; | ||||
2951 | break; | ||||
2952 | } | ||||
2953 | } | ||||
2954 | |||||
2955 | // Already handled. | ||||
2956 | if (isa<UsedAttr>(I)) | ||||
2957 | continue; | ||||
2958 | |||||
2959 | if (mergeDeclAttribute(*this, New, I, LocalAMK)) | ||||
2960 | foundAny = true; | ||||
2961 | } | ||||
2962 | |||||
2963 | if (mergeAlignedAttrs(*this, New, Old)) | ||||
2964 | foundAny = true; | ||||
2965 | |||||
2966 | if (!foundAny) New->dropAttrs(); | ||||
2967 | } | ||||
2968 | |||||
2969 | /// mergeParamDeclAttributes - Copy attributes from the old parameter | ||||
2970 | /// to the new one. | ||||
2971 | static void mergeParamDeclAttributes(ParmVarDecl *newDecl, | ||||
2972 | const ParmVarDecl *oldDecl, | ||||
2973 | Sema &S) { | ||||
2974 | // C++11 [dcl.attr.depend]p2: | ||||
2975 | // The first declaration of a function shall specify the | ||||
2976 | // carries_dependency attribute for its declarator-id if any declaration | ||||
2977 | // of the function specifies the carries_dependency attribute. | ||||
2978 | const CarriesDependencyAttr *CDA = newDecl->getAttr<CarriesDependencyAttr>(); | ||||
2979 | if (CDA && !oldDecl->hasAttr<CarriesDependencyAttr>()) { | ||||
2980 | S.Diag(CDA->getLocation(), | ||||
2981 | diag::err_carries_dependency_missing_on_first_decl) << 1/*Param*/; | ||||
2982 | // Find the first declaration of the parameter. | ||||
2983 | // FIXME: Should we build redeclaration chains for function parameters? | ||||
2984 | const FunctionDecl *FirstFD = | ||||
2985 | cast<FunctionDecl>(oldDecl->getDeclContext())->getFirstDecl(); | ||||
2986 | const ParmVarDecl *FirstVD = | ||||
2987 | FirstFD->getParamDecl(oldDecl->getFunctionScopeIndex()); | ||||
2988 | S.Diag(FirstVD->getLocation(), | ||||
2989 | diag::note_carries_dependency_missing_first_decl) << 1/*Param*/; | ||||
2990 | } | ||||
2991 | |||||
2992 | if (!oldDecl->hasAttrs()) | ||||
2993 | return; | ||||
2994 | |||||
2995 | bool foundAny = newDecl->hasAttrs(); | ||||
2996 | |||||
2997 | // Ensure that any moving of objects within the allocated map is | ||||
2998 | // done before we process them. | ||||
2999 | if (!foundAny) newDecl->setAttrs(AttrVec()); | ||||
3000 | |||||
3001 | for (const auto *I : oldDecl->specific_attrs<InheritableParamAttr>()) { | ||||
3002 | if (!DeclHasAttr(newDecl, I)) { | ||||
3003 | InheritableAttr *newAttr = | ||||
3004 | cast<InheritableParamAttr>(I->clone(S.Context)); | ||||
3005 | newAttr->setInherited(true); | ||||
3006 | newDecl->addAttr(newAttr); | ||||
3007 | foundAny = true; | ||||
3008 | } | ||||
3009 | } | ||||
3010 | |||||
3011 | if (!foundAny) newDecl->dropAttrs(); | ||||
3012 | } | ||||
3013 | |||||
3014 | static void mergeParamDeclTypes(ParmVarDecl *NewParam, | ||||
3015 | const ParmVarDecl *OldParam, | ||||
3016 | Sema &S) { | ||||
3017 | if (auto Oldnullability = OldParam->getType()->getNullability(S.Context)) { | ||||
3018 | if (auto Newnullability = NewParam->getType()->getNullability(S.Context)) { | ||||
3019 | if (*Oldnullability != *Newnullability) { | ||||
3020 | S.Diag(NewParam->getLocation(), diag::warn_mismatched_nullability_attr) | ||||
3021 | << DiagNullabilityKind( | ||||
3022 | *Newnullability, | ||||
3023 | ((NewParam->getObjCDeclQualifier() & Decl::OBJC_TQ_CSNullability) | ||||
3024 | != 0)) | ||||
3025 | << DiagNullabilityKind( | ||||
3026 | *Oldnullability, | ||||
3027 | ((OldParam->getObjCDeclQualifier() & Decl::OBJC_TQ_CSNullability) | ||||
3028 | != 0)); | ||||
3029 | S.Diag(OldParam->getLocation(), diag::note_previous_declaration); | ||||
3030 | } | ||||
3031 | } else { | ||||
3032 | QualType NewT = NewParam->getType(); | ||||
3033 | NewT = S.Context.getAttributedType( | ||||
3034 | AttributedType::getNullabilityAttrKind(*Oldnullability), | ||||
3035 | NewT, NewT); | ||||
3036 | NewParam->setType(NewT); | ||||
3037 | } | ||||
3038 | } | ||||
3039 | } | ||||
3040 | |||||
3041 | namespace { | ||||
3042 | |||||
3043 | /// Used in MergeFunctionDecl to keep track of function parameters in | ||||
3044 | /// C. | ||||
3045 | struct GNUCompatibleParamWarning { | ||||
3046 | ParmVarDecl *OldParm; | ||||
3047 | ParmVarDecl *NewParm; | ||||
3048 | QualType PromotedType; | ||||
3049 | }; | ||||
3050 | |||||
3051 | } // end anonymous namespace | ||||
3052 | |||||
3053 | // Determine whether the previous declaration was a definition, implicit | ||||
3054 | // declaration, or a declaration. | ||||
3055 | template <typename T> | ||||
3056 | static std::pair<diag::kind, SourceLocation> | ||||
3057 | getNoteDiagForInvalidRedeclaration(const T *Old, const T *New) { | ||||
3058 | diag::kind PrevDiag; | ||||
3059 | SourceLocation OldLocation = Old->getLocation(); | ||||
3060 | if (Old->isThisDeclarationADefinition()) | ||||
3061 | PrevDiag = diag::note_previous_definition; | ||||
3062 | else if (Old->isImplicit()) { | ||||
3063 | PrevDiag = diag::note_previous_implicit_declaration; | ||||
3064 | if (OldLocation.isInvalid()) | ||||
3065 | OldLocation = New->getLocation(); | ||||
3066 | } else | ||||
3067 | PrevDiag = diag::note_previous_declaration; | ||||
3068 | return std::make_pair(PrevDiag, OldLocation); | ||||
3069 | } | ||||
3070 | |||||
3071 | /// canRedefineFunction - checks if a function can be redefined. Currently, | ||||
3072 | /// only extern inline functions can be redefined, and even then only in | ||||
3073 | /// GNU89 mode. | ||||
3074 | static bool canRedefineFunction(const FunctionDecl *FD, | ||||
3075 | const LangOptions& LangOpts) { | ||||
3076 | return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && | ||||
3077 | !LangOpts.CPlusPlus && | ||||
3078 | FD->isInlineSpecified() && | ||||
3079 | FD->getStorageClass() == SC_Extern); | ||||
3080 | } | ||||
3081 | |||||
3082 | const AttributedType *Sema::getCallingConvAttributedType(QualType T) const { | ||||
3083 | const AttributedType *AT = T->getAs<AttributedType>(); | ||||
3084 | while (AT && !AT->isCallingConv()) | ||||
3085 | AT = AT->getModifiedType()->getAs<AttributedType>(); | ||||
3086 | return AT; | ||||
3087 | } | ||||
3088 | |||||
3089 | template <typename T> | ||||
3090 | static bool haveIncompatibleLanguageLinkages(const T *Old, const T *New) { | ||||
3091 | const DeclContext *DC = Old->getDeclContext(); | ||||
3092 | if (DC->isRecord()) | ||||
3093 | return false; | ||||
3094 | |||||
3095 | LanguageLinkage OldLinkage = Old->getLanguageLinkage(); | ||||
3096 | if (OldLinkage == CXXLanguageLinkage && New->isInExternCContext()) | ||||
3097 | return true; | ||||
3098 | if (OldLinkage == CLanguageLinkage && New->isInExternCXXContext()) | ||||
3099 | return true; | ||||
3100 | return false; | ||||
3101 | } | ||||
3102 | |||||
3103 | template<typename T> static bool isExternC(T *D) { return D->isExternC(); } | ||||
3104 | static bool isExternC(VarTemplateDecl *) { return false; } | ||||
3105 | |||||
3106 | /// Check whether a redeclaration of an entity introduced by a | ||||
3107 | /// using-declaration is valid, given that we know it's not an overload | ||||
3108 | /// (nor a hidden tag declaration). | ||||
3109 | template<typename ExpectedDecl> | ||||
3110 | static bool checkUsingShadowRedecl(Sema &S, UsingShadowDecl *OldS, | ||||
3111 | ExpectedDecl *New) { | ||||
3112 | // C++11 [basic.scope.declarative]p4: | ||||
3113 | // Given a set of declarations in a single declarative region, each of | ||||
3114 | // which specifies the same unqualified name, | ||||
3115 | // -- they shall all refer to the same entity, or all refer to functions | ||||
3116 | // and function templates; or | ||||
3117 | // -- exactly one declaration shall declare a class name or enumeration | ||||
3118 | // name that is not a typedef name and the other declarations shall all | ||||
3119 | // refer to the same variable or enumerator, or all refer to functions | ||||
3120 | // and function templates; in this case the class name or enumeration | ||||
3121 | // name is hidden (3.3.10). | ||||
3122 | |||||
3123 | // C++11 [namespace.udecl]p14: | ||||
3124 | // If a function declaration in namespace scope or block scope has the | ||||
3125 | // same name and the same parameter-type-list as a function introduced | ||||
3126 | // by a using-declaration, and the declarations do not declare the same | ||||
3127 | // function, the program is ill-formed. | ||||
3128 | |||||
3129 | auto *Old = dyn_cast<ExpectedDecl>(OldS->getTargetDecl()); | ||||
3130 | if (Old && | ||||
3131 | !Old->getDeclContext()->getRedeclContext()->Equals( | ||||
3132 | New->getDeclContext()->getRedeclContext()) && | ||||
3133 | !(isExternC(Old) && isExternC(New))) | ||||
3134 | Old = nullptr; | ||||
3135 | |||||
3136 | if (!Old) { | ||||
3137 | S.Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); | ||||
3138 | S.Diag(OldS->getTargetDecl()->getLocation(), diag::note_using_decl_target); | ||||
3139 | S.Diag(OldS->getUsingDecl()->getLocation(), diag::note_using_decl) << 0; | ||||
3140 | return true; | ||||
3141 | } | ||||
3142 | return false; | ||||
3143 | } | ||||
3144 | |||||
3145 | static bool hasIdenticalPassObjectSizeAttrs(const FunctionDecl *A, | ||||
3146 | const FunctionDecl *B) { | ||||
3147 | assert(A->getNumParams() == B->getNumParams())((A->getNumParams() == B->getNumParams()) ? static_cast <void> (0) : __assert_fail ("A->getNumParams() == B->getNumParams()" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 3147, __PRETTY_FUNCTION__)); | ||||
3148 | |||||
3149 | auto AttrEq = [](const ParmVarDecl *A, const ParmVarDecl *B) { | ||||
3150 | const auto *AttrA = A->getAttr<PassObjectSizeAttr>(); | ||||
3151 | const auto *AttrB = B->getAttr<PassObjectSizeAttr>(); | ||||
3152 | if (AttrA == AttrB) | ||||
3153 | return true; | ||||
3154 | return AttrA && AttrB && AttrA->getType() == AttrB->getType() && | ||||
3155 | AttrA->isDynamic() == AttrB->isDynamic(); | ||||
3156 | }; | ||||
3157 | |||||
3158 | return std::equal(A->param_begin(), A->param_end(), B->param_begin(), AttrEq); | ||||
3159 | } | ||||
3160 | |||||
3161 | /// If necessary, adjust the semantic declaration context for a qualified | ||||
3162 | /// declaration to name the correct inline namespace within the qualifier. | ||||
3163 | static void adjustDeclContextForDeclaratorDecl(DeclaratorDecl *NewD, | ||||
3164 | DeclaratorDecl *OldD) { | ||||
3165 | // The only case where we need to update the DeclContext is when | ||||
3166 | // redeclaration lookup for a qualified name finds a declaration | ||||
3167 | // in an inline namespace within the context named by the qualifier: | ||||
3168 | // | ||||
3169 | // inline namespace N { int f(); } | ||||
3170 | // int ::f(); // Sema DC needs adjusting from :: to N::. | ||||
3171 | // | ||||
3172 | // For unqualified declarations, the semantic context *can* change | ||||
3173 | // along the redeclaration chain (for local extern declarations, | ||||
3174 | // extern "C" declarations, and friend declarations in particular). | ||||
3175 | if (!NewD->getQualifier()) | ||||
3176 | return; | ||||
3177 | |||||
3178 | // NewD is probably already in the right context. | ||||
3179 | auto *NamedDC = NewD->getDeclContext()->getRedeclContext(); | ||||
3180 | auto *SemaDC = OldD->getDeclContext()->getRedeclContext(); | ||||
3181 | if (NamedDC->Equals(SemaDC)) | ||||
3182 | return; | ||||
3183 | |||||
3184 | assert((NamedDC->InEnclosingNamespaceSetOf(SemaDC) ||(((NamedDC->InEnclosingNamespaceSetOf(SemaDC) || NewD-> isInvalidDecl() || OldD->isInvalidDecl()) && "unexpected context for redeclaration" ) ? static_cast<void> (0) : __assert_fail ("(NamedDC->InEnclosingNamespaceSetOf(SemaDC) || NewD->isInvalidDecl() || OldD->isInvalidDecl()) && \"unexpected context for redeclaration\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 3186, __PRETTY_FUNCTION__)) | ||||
3185 | NewD->isInvalidDecl() || OldD->isInvalidDecl()) &&(((NamedDC->InEnclosingNamespaceSetOf(SemaDC) || NewD-> isInvalidDecl() || OldD->isInvalidDecl()) && "unexpected context for redeclaration" ) ? static_cast<void> (0) : __assert_fail ("(NamedDC->InEnclosingNamespaceSetOf(SemaDC) || NewD->isInvalidDecl() || OldD->isInvalidDecl()) && \"unexpected context for redeclaration\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 3186, __PRETTY_FUNCTION__)) | ||||
3186 | "unexpected context for redeclaration")(((NamedDC->InEnclosingNamespaceSetOf(SemaDC) || NewD-> isInvalidDecl() || OldD->isInvalidDecl()) && "unexpected context for redeclaration" ) ? static_cast<void> (0) : __assert_fail ("(NamedDC->InEnclosingNamespaceSetOf(SemaDC) || NewD->isInvalidDecl() || OldD->isInvalidDecl()) && \"unexpected context for redeclaration\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 3186, __PRETTY_FUNCTION__)); | ||||
3187 | |||||
3188 | auto *LexDC = NewD->getLexicalDeclContext(); | ||||
3189 | auto FixSemaDC = [=](NamedDecl *D) { | ||||
3190 | if (!D) | ||||
3191 | return; | ||||
3192 | D->setDeclContext(SemaDC); | ||||
3193 | D->setLexicalDeclContext(LexDC); | ||||
3194 | }; | ||||
3195 | |||||
3196 | FixSemaDC(NewD); | ||||
3197 | if (auto *FD = dyn_cast<FunctionDecl>(NewD)) | ||||
3198 | FixSemaDC(FD->getDescribedFunctionTemplate()); | ||||
3199 | else if (auto *VD = dyn_cast<VarDecl>(NewD)) | ||||
3200 | FixSemaDC(VD->getDescribedVarTemplate()); | ||||
3201 | } | ||||
3202 | |||||
3203 | /// MergeFunctionDecl - We just parsed a function 'New' from | ||||
3204 | /// declarator D which has the same name and scope as a previous | ||||
3205 | /// declaration 'Old'. Figure out how to resolve this situation, | ||||
3206 | /// merging decls or emitting diagnostics as appropriate. | ||||
3207 | /// | ||||
3208 | /// In C++, New and Old must be declarations that are not | ||||
3209 | /// overloaded. Use IsOverload to determine whether New and Old are | ||||
3210 | /// overloaded, and to select the Old declaration that New should be | ||||
3211 | /// merged with. | ||||
3212 | /// | ||||
3213 | /// Returns true if there was an error, false otherwise. | ||||
3214 | bool Sema::MergeFunctionDecl(FunctionDecl *New, NamedDecl *&OldD, | ||||
3215 | Scope *S, bool MergeTypeWithOld) { | ||||
3216 | // Verify the old decl was also a function. | ||||
3217 | FunctionDecl *Old = OldD->getAsFunction(); | ||||
3218 | if (!Old) { | ||||
| |||||
3219 | if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { | ||||
3220 | if (New->getFriendObjectKind()) { | ||||
3221 | Diag(New->getLocation(), diag::err_using_decl_friend); | ||||
3222 | Diag(Shadow->getTargetDecl()->getLocation(), | ||||
3223 | diag::note_using_decl_target); | ||||
3224 | Diag(Shadow->getUsingDecl()->getLocation(), | ||||
3225 | diag::note_using_decl) << 0; | ||||
3226 | return true; | ||||
3227 | } | ||||
3228 | |||||
3229 | // Check whether the two declarations might declare the same function. | ||||
3230 | if (checkUsingShadowRedecl<FunctionDecl>(*this, Shadow, New)) | ||||
3231 | return true; | ||||
3232 | OldD = Old = cast<FunctionDecl>(Shadow->getTargetDecl()); | ||||
3233 | } else { | ||||
3234 | Diag(New->getLocation(), diag::err_redefinition_different_kind) | ||||
3235 | << New->getDeclName(); | ||||
3236 | notePreviousDefinition(OldD, New->getLocation()); | ||||
3237 | return true; | ||||
3238 | } | ||||
3239 | } | ||||
3240 | |||||
3241 | // If the old declaration is invalid, just give up here. | ||||
3242 | if (Old->isInvalidDecl()) | ||||
3243 | return true; | ||||
3244 | |||||
3245 | // Disallow redeclaration of some builtins. | ||||
3246 | if (!getASTContext().canBuiltinBeRedeclared(Old)) { | ||||
3247 | Diag(New->getLocation(), diag::err_builtin_redeclare) << Old->getDeclName(); | ||||
3248 | Diag(Old->getLocation(), diag::note_previous_builtin_declaration) | ||||
3249 | << Old << Old->getType(); | ||||
3250 | return true; | ||||
3251 | } | ||||
3252 | |||||
3253 | diag::kind PrevDiag; | ||||
3254 | SourceLocation OldLocation; | ||||
3255 | std::tie(PrevDiag, OldLocation) = | ||||
3256 | getNoteDiagForInvalidRedeclaration(Old, New); | ||||
3257 | |||||
3258 | // Don't complain about this if we're in GNU89 mode and the old function | ||||
3259 | // is an extern inline function. | ||||
3260 | // Don't complain about specializations. They are not supposed to have | ||||
3261 | // storage classes. | ||||
3262 | if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && | ||||
3263 | New->getStorageClass() == SC_Static && | ||||
3264 | Old->hasExternalFormalLinkage() && | ||||
3265 | !New->getTemplateSpecializationInfo() && | ||||
3266 | !canRedefineFunction(Old, getLangOpts())) { | ||||
3267 | if (getLangOpts().MicrosoftExt) { | ||||
3268 | Diag(New->getLocation(), diag::ext_static_non_static) << New; | ||||
3269 | Diag(OldLocation, PrevDiag); | ||||
3270 | } else { | ||||
3271 | Diag(New->getLocation(), diag::err_static_non_static) << New; | ||||
3272 | Diag(OldLocation, PrevDiag); | ||||
3273 | return true; | ||||
3274 | } | ||||
3275 | } | ||||
3276 | |||||
3277 | if (New->hasAttr<InternalLinkageAttr>() && | ||||
3278 | !Old->hasAttr<InternalLinkageAttr>()) { | ||||
3279 | Diag(New->getLocation(), diag::err_internal_linkage_redeclaration) | ||||
3280 | << New->getDeclName(); | ||||
3281 | notePreviousDefinition(Old, New->getLocation()); | ||||
3282 | New->dropAttr<InternalLinkageAttr>(); | ||||
3283 | } | ||||
3284 | |||||
3285 | if (CheckRedeclarationModuleOwnership(New, Old)) | ||||
3286 | return true; | ||||
3287 | |||||
3288 | if (!getLangOpts().CPlusPlus) { | ||||
3289 | bool OldOvl = Old->hasAttr<OverloadableAttr>(); | ||||
3290 | if (OldOvl != New->hasAttr<OverloadableAttr>() && !Old->isImplicit()) { | ||||
3291 | Diag(New->getLocation(), diag::err_attribute_overloadable_mismatch) | ||||
3292 | << New << OldOvl; | ||||
3293 | |||||
3294 | // Try our best to find a decl that actually has the overloadable | ||||
3295 | // attribute for the note. In most cases (e.g. programs with only one | ||||
3296 | // broken declaration/definition), this won't matter. | ||||
3297 | // | ||||
3298 | // FIXME: We could do this if we juggled some extra state in | ||||
3299 | // OverloadableAttr, rather than just removing it. | ||||
3300 | const Decl *DiagOld = Old; | ||||
3301 | if (OldOvl) { | ||||
3302 | auto OldIter = llvm::find_if(Old->redecls(), [](const Decl *D) { | ||||
3303 | const auto *A = D->getAttr<OverloadableAttr>(); | ||||
3304 | return A && !A->isImplicit(); | ||||
3305 | }); | ||||
3306 | // If we've implicitly added *all* of the overloadable attrs to this | ||||
3307 | // chain, emitting a "previous redecl" note is pointless. | ||||
3308 | DiagOld = OldIter == Old->redecls_end() ? nullptr : *OldIter; | ||||
3309 | } | ||||
3310 | |||||
3311 | if (DiagOld) | ||||
3312 | Diag(DiagOld->getLocation(), | ||||
3313 | diag::note_attribute_overloadable_prev_overload) | ||||
3314 | << OldOvl; | ||||
3315 | |||||
3316 | if (OldOvl) | ||||
3317 | New->addAttr(OverloadableAttr::CreateImplicit(Context)); | ||||
3318 | else | ||||
3319 | New->dropAttr<OverloadableAttr>(); | ||||
3320 | } | ||||
3321 | } | ||||
3322 | |||||
3323 | // If a function is first declared with a calling convention, but is later | ||||
3324 | // declared or defined without one, all following decls assume the calling | ||||
3325 | // convention of the first. | ||||
3326 | // | ||||
3327 | // It's OK if a function is first declared without a calling convention, | ||||
3328 | // but is later declared or defined with the default calling convention. | ||||
3329 | // | ||||
3330 | // To test if either decl has an explicit calling convention, we look for | ||||
3331 | // AttributedType sugar nodes on the type as written. If they are missing or | ||||
3332 | // were canonicalized away, we assume the calling convention was implicit. | ||||
3333 | // | ||||
3334 | // Note also that we DO NOT return at this point, because we still have | ||||
3335 | // other tests to run. | ||||
3336 | QualType OldQType = Context.getCanonicalType(Old->getType()); | ||||
3337 | QualType NewQType = Context.getCanonicalType(New->getType()); | ||||
3338 | const FunctionType *OldType = cast<FunctionType>(OldQType); | ||||
3339 | const FunctionType *NewType = cast<FunctionType>(NewQType); | ||||
3340 | FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); | ||||
3341 | FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); | ||||
3342 | bool RequiresAdjustment = false; | ||||
3343 | |||||
3344 | if (OldTypeInfo.getCC() != NewTypeInfo.getCC()) { | ||||
3345 | FunctionDecl *First = Old->getFirstDecl(); | ||||
3346 | const FunctionType *FT = | ||||
3347 | First->getType().getCanonicalType()->castAs<FunctionType>(); | ||||
3348 | FunctionType::ExtInfo FI = FT->getExtInfo(); | ||||
3349 | bool NewCCExplicit = getCallingConvAttributedType(New->getType()); | ||||
3350 | if (!NewCCExplicit) { | ||||
3351 | // Inherit the CC from the previous declaration if it was specified | ||||
3352 | // there but not here. | ||||
3353 | NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); | ||||
3354 | RequiresAdjustment = true; | ||||
3355 | } else if (Old->getBuiltinID()) { | ||||
3356 | // Builtin attribute isn't propagated to the new one yet at this point, | ||||
3357 | // so we check if the old one is a builtin. | ||||
3358 | |||||
3359 | // Calling Conventions on a Builtin aren't really useful and setting a | ||||
3360 | // default calling convention and cdecl'ing some builtin redeclarations is | ||||
3361 | // common, so warn and ignore the calling convention on the redeclaration. | ||||
3362 | Diag(New->getLocation(), diag::warn_cconv_unsupported) | ||||
3363 | << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) | ||||
3364 | << (int)CallingConventionIgnoredReason::BuiltinFunction; | ||||
3365 | NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); | ||||
3366 | RequiresAdjustment = true; | ||||
3367 | } else { | ||||
3368 | // Calling conventions aren't compatible, so complain. | ||||
3369 | bool FirstCCExplicit = getCallingConvAttributedType(First->getType()); | ||||
3370 | Diag(New->getLocation(), diag::err_cconv_change) | ||||
3371 | << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) | ||||
3372 | << !FirstCCExplicit | ||||
3373 | << (!FirstCCExplicit ? "" : | ||||
3374 | FunctionType::getNameForCallConv(FI.getCC())); | ||||
3375 | |||||
3376 | // Put the note on the first decl, since it is the one that matters. | ||||
3377 | Diag(First->getLocation(), diag::note_previous_declaration); | ||||
3378 | return true; | ||||
3379 | } | ||||
3380 | } | ||||
3381 | |||||
3382 | // FIXME: diagnose the other way around? | ||||
3383 | if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { | ||||
3384 | NewTypeInfo = NewTypeInfo.withNoReturn(true); | ||||
3385 | RequiresAdjustment = true; | ||||
3386 | } | ||||
3387 | |||||
3388 | // Merge regparm attribute. | ||||
3389 | if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || | ||||
3390 | OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { | ||||
3391 | if (NewTypeInfo.getHasRegParm()) { | ||||
3392 | Diag(New->getLocation(), diag::err_regparm_mismatch) | ||||
3393 | << NewType->getRegParmType() | ||||
3394 | << OldType->getRegParmType(); | ||||
3395 | Diag(OldLocation, diag::note_previous_declaration); | ||||
3396 | return true; | ||||
3397 | } | ||||
3398 | |||||
3399 | NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); | ||||
3400 | RequiresAdjustment = true; | ||||
3401 | } | ||||
3402 | |||||
3403 | // Merge ns_returns_retained attribute. | ||||
3404 | if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { | ||||
3405 | if (NewTypeInfo.getProducesResult()) { | ||||
3406 | Diag(New->getLocation(), diag::err_function_attribute_mismatch) | ||||
3407 | << "'ns_returns_retained'"; | ||||
3408 | Diag(OldLocation, diag::note_previous_declaration); | ||||
3409 | return true; | ||||
3410 | } | ||||
3411 | |||||
3412 | NewTypeInfo = NewTypeInfo.withProducesResult(true); | ||||
3413 | RequiresAdjustment = true; | ||||
3414 | } | ||||
3415 | |||||
3416 | if (OldTypeInfo.getNoCallerSavedRegs() != | ||||
3417 | NewTypeInfo.getNoCallerSavedRegs()) { | ||||
3418 | if (NewTypeInfo.getNoCallerSavedRegs()) { | ||||
3419 | AnyX86NoCallerSavedRegistersAttr *Attr = | ||||
3420 | New->getAttr<AnyX86NoCallerSavedRegistersAttr>(); | ||||
3421 | Diag(New->getLocation(), diag::err_function_attribute_mismatch) << Attr; | ||||
3422 | Diag(OldLocation, diag::note_previous_declaration); | ||||
3423 | return true; | ||||
3424 | } | ||||
3425 | |||||
3426 | NewTypeInfo = NewTypeInfo.withNoCallerSavedRegs(true); | ||||
3427 | RequiresAdjustment = true; | ||||
3428 | } | ||||
3429 | |||||
3430 | if (RequiresAdjustment
| ||||
3431 | const FunctionType *AdjustedType = New->getType()->getAs<FunctionType>(); | ||||
3432 | AdjustedType = Context.adjustFunctionType(AdjustedType, NewTypeInfo); | ||||
3433 | New->setType(QualType(AdjustedType, 0)); | ||||
3434 | NewQType = Context.getCanonicalType(New->getType()); | ||||
3435 | } | ||||
3436 | |||||
3437 | // If this redeclaration makes the function inline, we may need to add it to | ||||
3438 | // UndefinedButUsed. | ||||
3439 | if (!Old->isInlined() && New->isInlined() && | ||||
3440 | !New->hasAttr<GNUInlineAttr>() && | ||||
3441 | !getLangOpts().GNUInline && | ||||
3442 | Old->isUsed(false) && | ||||
3443 | !Old->isDefined() && !New->isThisDeclarationADefinition()) | ||||
3444 | UndefinedButUsed.insert(std::make_pair(Old->getCanonicalDecl(), | ||||
3445 | SourceLocation())); | ||||
3446 | |||||
3447 | // If this redeclaration makes it newly gnu_inline, we don't want to warn | ||||
3448 | // about it. | ||||
3449 | if (New->hasAttr<GNUInlineAttr>() && | ||||
3450 | Old->isInlined() && !Old->hasAttr<GNUInlineAttr>()) { | ||||
3451 | UndefinedButUsed.erase(Old->getCanonicalDecl()); | ||||
3452 | } | ||||
3453 | |||||
3454 | // If pass_object_size params don't match up perfectly, this isn't a valid | ||||
3455 | // redeclaration. | ||||
3456 | if (Old->getNumParams() > 0 && Old->getNumParams() == New->getNumParams() && | ||||
3457 | !hasIdenticalPassObjectSizeAttrs(Old, New)) { | ||||
3458 | Diag(New->getLocation(), diag::err_different_pass_object_size_params) | ||||
3459 | << New->getDeclName(); | ||||
3460 | Diag(OldLocation, PrevDiag) << Old << Old->getType(); | ||||
3461 | return true; | ||||
3462 | } | ||||
3463 | |||||
3464 | if (getLangOpts().CPlusPlus
| ||||
3465 | // C++1z [over.load]p2 | ||||
3466 | // Certain function declarations cannot be overloaded: | ||||
3467 | // -- Function declarations that differ only in the return type, | ||||
3468 | // the exception specification, or both cannot be overloaded. | ||||
3469 | |||||
3470 | // Check the exception specifications match. This may recompute the type of | ||||
3471 | // both Old and New if it resolved exception specifications, so grab the | ||||
3472 | // types again after this. Because this updates the type, we do this before | ||||
3473 | // any of the other checks below, which may update the "de facto" NewQType | ||||
3474 | // but do not necessarily update the type of New. | ||||
3475 | if (CheckEquivalentExceptionSpec(Old, New)) | ||||
3476 | return true; | ||||
3477 | OldQType = Context.getCanonicalType(Old->getType()); | ||||
3478 | NewQType = Context.getCanonicalType(New->getType()); | ||||
3479 | |||||
3480 | // Go back to the type source info to compare the declared return types, | ||||
3481 | // per C++1y [dcl.type.auto]p13: | ||||
3482 | // Redeclarations or specializations of a function or function template | ||||
3483 | // with a declared return type that uses a placeholder type shall also | ||||
3484 | // use that placeholder, not a deduced type. | ||||
3485 | QualType OldDeclaredReturnType = Old->getDeclaredReturnType(); | ||||
3486 | QualType NewDeclaredReturnType = New->getDeclaredReturnType(); | ||||
3487 | if (!Context.hasSameType(OldDeclaredReturnType, NewDeclaredReturnType) && | ||||
3488 | canFullyTypeCheckRedeclaration(New, Old, NewDeclaredReturnType, | ||||
3489 | OldDeclaredReturnType)) { | ||||
3490 | QualType ResQT; | ||||
3491 | if (NewDeclaredReturnType->isObjCObjectPointerType() && | ||||
3492 | OldDeclaredReturnType->isObjCObjectPointerType()) | ||||
3493 | // FIXME: This does the wrong thing for a deduced return type. | ||||
3494 | ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); | ||||
3495 | if (ResQT.isNull()) { | ||||
3496 | if (New->isCXXClassMember() && New->isOutOfLine()) | ||||
3497 | Diag(New->getLocation(), diag::err_member_def_does_not_match_ret_type) | ||||
3498 | << New << New->getReturnTypeSourceRange(); | ||||
3499 | else | ||||
3500 | Diag(New->getLocation(), diag::err_ovl_diff_return_type) | ||||
3501 | << New->getReturnTypeSourceRange(); | ||||
3502 | Diag(OldLocation, PrevDiag) << Old << Old->getType() | ||||
3503 | << Old->getReturnTypeSourceRange(); | ||||
3504 | return true; | ||||
3505 | } | ||||
3506 | else | ||||
3507 | NewQType = ResQT; | ||||
3508 | } | ||||
3509 | |||||
3510 | QualType OldReturnType = OldType->getReturnType(); | ||||
3511 | QualType NewReturnType = cast<FunctionType>(NewQType)->getReturnType(); | ||||
3512 | if (OldReturnType != NewReturnType) { | ||||
3513 | // If this function has a deduced return type and has already been | ||||
3514 | // defined, copy the deduced value from the old declaration. | ||||
3515 | AutoType *OldAT = Old->getReturnType()->getContainedAutoType(); | ||||
3516 | if (OldAT && OldAT->isDeduced()) { | ||||
3517 | New->setType( | ||||
3518 | SubstAutoType(New->getType(), | ||||
3519 | OldAT->isDependentType() ? Context.DependentTy | ||||
3520 | : OldAT->getDeducedType())); | ||||
3521 | NewQType = Context.getCanonicalType( | ||||
3522 | SubstAutoType(NewQType, | ||||
3523 | OldAT->isDependentType() ? Context.DependentTy | ||||
3524 | : OldAT->getDeducedType())); | ||||
3525 | } | ||||
3526 | } | ||||
3527 | |||||
3528 | const CXXMethodDecl *OldMethod = dyn_cast<CXXMethodDecl>(Old); | ||||
3529 | CXXMethodDecl *NewMethod = dyn_cast<CXXMethodDecl>(New); | ||||
3530 | if (OldMethod
| ||||
3531 | // Preserve triviality. | ||||
3532 | NewMethod->setTrivial(OldMethod->isTrivial()); | ||||
3533 | |||||
3534 | // MSVC allows explicit template specialization at class scope: | ||||
3535 | // 2 CXXMethodDecls referring to the same function will be injected. | ||||
3536 | // We don't want a redeclaration error. | ||||
3537 | bool IsClassScopeExplicitSpecialization = | ||||
3538 | OldMethod->isFunctionTemplateSpecialization() && | ||||
3539 | NewMethod->isFunctionTemplateSpecialization(); | ||||
3540 | bool isFriend = NewMethod->getFriendObjectKind(); | ||||
3541 | |||||
3542 | if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && | ||||
3543 | !IsClassScopeExplicitSpecialization) { | ||||
3544 | // -- Member function declarations with the same name and the | ||||
3545 | // same parameter types cannot be overloaded if any of them | ||||
3546 | // is a static member function declaration. | ||||
3547 | if (OldMethod->isStatic() != NewMethod->isStatic()) { | ||||
3548 | Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); | ||||
3549 | Diag(OldLocation, PrevDiag) << Old << Old->getType(); | ||||
3550 | return true; | ||||
3551 | } | ||||
3552 | |||||
3553 | // C++ [class.mem]p1: | ||||
3554 | // [...] A member shall not be declared twice in the | ||||
3555 | // member-specification, except that a nested class or member | ||||
3556 | // class template can be declared and then later defined. | ||||
3557 | if (!inTemplateInstantiation()) { | ||||
3558 | unsigned NewDiag; | ||||
3559 | if (isa<CXXConstructorDecl>(OldMethod)) | ||||
3560 | NewDiag = diag::err_constructor_redeclared; | ||||
3561 | else if (isa<CXXDestructorDecl>(NewMethod)) | ||||
3562 | NewDiag = diag::err_destructor_redeclared; | ||||
3563 | else if (isa<CXXConversionDecl>(NewMethod)) | ||||
3564 | NewDiag = diag::err_conv_function_redeclared; | ||||
3565 | else | ||||
3566 | NewDiag = diag::err_member_redeclared; | ||||
3567 | |||||
3568 | Diag(New->getLocation(), NewDiag); | ||||
3569 | } else { | ||||
3570 | Diag(New->getLocation(), diag::err_member_redeclared_in_instantiation) | ||||
3571 | << New << New->getType(); | ||||
3572 | } | ||||
3573 | Diag(OldLocation, PrevDiag) << Old << Old->getType(); | ||||
3574 | return true; | ||||
3575 | |||||
3576 | // Complain if this is an explicit declaration of a special | ||||
3577 | // member that was initially declared implicitly. | ||||
3578 | // | ||||
3579 | // As an exception, it's okay to befriend such methods in order | ||||
3580 | // to permit the implicit constructor/destructor/operator calls. | ||||
3581 | } else if (OldMethod->isImplicit()) { | ||||
3582 | if (isFriend) { | ||||
3583 | NewMethod->setImplicit(); | ||||
3584 | } else { | ||||
3585 | Diag(NewMethod->getLocation(), | ||||
3586 | diag::err_definition_of_implicitly_declared_member) | ||||
3587 | << New << getSpecialMember(OldMethod); | ||||
3588 | return true; | ||||
3589 | } | ||||
3590 | } else if (OldMethod->getFirstDecl()->isExplicitlyDefaulted() && !isFriend) { | ||||
3591 | Diag(NewMethod->getLocation(), | ||||
3592 | diag::err_definition_of_explicitly_defaulted_member) | ||||
3593 | << getSpecialMember(OldMethod); | ||||
3594 | return true; | ||||
3595 | } | ||||
3596 | } | ||||
3597 | |||||
3598 | // C++11 [dcl.attr.noreturn]p1: | ||||
3599 | // The first declaration of a function shall specify the noreturn | ||||
3600 | // attribute if any declaration of that function specifies the noreturn | ||||
3601 | // attribute. | ||||
3602 | const CXX11NoReturnAttr *NRA = New->getAttr<CXX11NoReturnAttr>(); | ||||
3603 | if (NRA
| ||||
3604 | Diag(NRA->getLocation(), diag::err_noreturn_missing_on_first_decl); | ||||
3605 | Diag(Old->getFirstDecl()->getLocation(), | ||||
3606 | diag::note_noreturn_missing_first_decl); | ||||
3607 | } | ||||
3608 | |||||
3609 | // C++11 [dcl.attr.depend]p2: | ||||
3610 | // The first declaration of a function shall specify the | ||||
3611 | // carries_dependency attribute for its declarator-id if any declaration | ||||
3612 | // of the function specifies the carries_dependency attribute. | ||||
3613 | const CarriesDependencyAttr *CDA = New->getAttr<CarriesDependencyAttr>(); | ||||
3614 | if (CDA
| ||||
3615 | Diag(CDA->getLocation(), | ||||
3616 | diag::err_carries_dependency_missing_on_first_decl) << 0/*Function*/; | ||||
3617 | Diag(Old->getFirstDecl()->getLocation(), | ||||
3618 | diag::note_carries_dependency_missing_first_decl) << 0/*Function*/; | ||||
3619 | } | ||||
3620 | |||||
3621 | // (C++98 8.3.5p3): | ||||
3622 | // All declarations for a function shall agree exactly in both the | ||||
3623 | // return type and the parameter-type-list. | ||||
3624 | // We also want to respect all the extended bits except noreturn. | ||||
3625 | |||||
3626 | // noreturn should now match unless the old type info didn't have it. | ||||
3627 | QualType OldQTypeForComparison = OldQType; | ||||
3628 | if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { | ||||
3629 | auto *OldType = OldQType->castAs<FunctionProtoType>(); | ||||
3630 | const FunctionType *OldTypeForComparison | ||||
3631 | = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); | ||||
3632 | OldQTypeForComparison = QualType(OldTypeForComparison, 0); | ||||
3633 | assert(OldQTypeForComparison.isCanonical())((OldQTypeForComparison.isCanonical()) ? static_cast<void> (0) : __assert_fail ("OldQTypeForComparison.isCanonical()", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 3633, __PRETTY_FUNCTION__)); | ||||
3634 | } | ||||
3635 | |||||
3636 | if (haveIncompatibleLanguageLinkages(Old, New)) { | ||||
3637 | // As a special case, retain the language linkage from previous | ||||
3638 | // declarations of a friend function as an extension. | ||||
3639 | // | ||||
3640 | // This liberal interpretation of C++ [class.friend]p3 matches GCC/MSVC | ||||
3641 | // and is useful because there's otherwise no way to specify language | ||||
3642 | // linkage within class scope. | ||||
3643 | // | ||||
3644 | // Check cautiously as the friend object kind isn't yet complete. | ||||
3645 | if (New->getFriendObjectKind() != Decl::FOK_None) { | ||||
3646 | Diag(New->getLocation(), diag::ext_retained_language_linkage) << New; | ||||
3647 | Diag(OldLocation, PrevDiag); | ||||
3648 | } else { | ||||
3649 | Diag(New->getLocation(), diag::err_different_language_linkage) << New; | ||||
3650 | Diag(OldLocation, PrevDiag); | ||||
3651 | return true; | ||||
3652 | } | ||||
3653 | } | ||||
3654 | |||||
3655 | // If the function types are compatible, merge the declarations. Ignore the | ||||
3656 | // exception specifier because it was already checked above in | ||||
3657 | // CheckEquivalentExceptionSpec, and we don't want follow-on diagnostics | ||||
3658 | // about incompatible types under -fms-compatibility. | ||||
3659 | if (Context.hasSameFunctionTypeIgnoringExceptionSpec(OldQTypeForComparison, | ||||
3660 | NewQType)) | ||||
3661 | return MergeCompatibleFunctionDecls(New, Old, S, MergeTypeWithOld); | ||||
3662 | |||||
3663 | // If the types are imprecise (due to dependent constructs in friends or | ||||
3664 | // local extern declarations), it's OK if they differ. We'll check again | ||||
3665 | // during instantiation. | ||||
3666 | if (!canFullyTypeCheckRedeclaration(New, Old, NewQType, OldQType)) | ||||
3667 | return false; | ||||
3668 | |||||
3669 | // Fall through for conflicting redeclarations and redefinitions. | ||||
3670 | } | ||||
3671 | |||||
3672 | // C: Function types need to be compatible, not identical. This handles | ||||
3673 | // duplicate function decls like "void f(int); void f(enum X);" properly. | ||||
3674 | if (!getLangOpts().CPlusPlus && | ||||
3675 | Context.typesAreCompatible(OldQType, NewQType)) { | ||||
3676 | const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); | ||||
3677 | const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); | ||||
3678 | const FunctionProtoType *OldProto = nullptr; | ||||
3679 | if (MergeTypeWithOld && isa<FunctionNoProtoType>(NewFuncType) && | ||||
3680 | (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { | ||||
3681 | // The old declaration provided a function prototype, but the | ||||
3682 | // new declaration does not. Merge in the prototype. | ||||
3683 | assert(!OldProto->hasExceptionSpec() && "Exception spec in C")((!OldProto->hasExceptionSpec() && "Exception spec in C" ) ? static_cast<void> (0) : __assert_fail ("!OldProto->hasExceptionSpec() && \"Exception spec in C\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 3683, __PRETTY_FUNCTION__)); | ||||
3684 | SmallVector<QualType, 16> ParamTypes(OldProto->param_types()); | ||||
3685 | NewQType = | ||||
3686 | Context.getFunctionType(NewFuncType->getReturnType(), ParamTypes, | ||||
| |||||
3687 | OldProto->getExtProtoInfo()); | ||||
3688 | New->setType(NewQType); | ||||
3689 | New->setHasInheritedPrototype(); | ||||
3690 | |||||
3691 | // Synthesize parameters with the same types. | ||||
3692 | SmallVector<ParmVarDecl*, 16> Params; | ||||
3693 | for (const auto &ParamType : OldProto->param_types()) { | ||||
3694 | ParmVarDecl *Param = ParmVarDecl::Create(Context, New, SourceLocation(), | ||||
3695 | SourceLocation(), nullptr, | ||||
3696 | ParamType, /*TInfo=*/nullptr, | ||||
3697 | SC_None, nullptr); | ||||
3698 | Param->setScopeInfo(0, Params.size()); | ||||
3699 | Param->setImplicit(); | ||||
3700 | Params.push_back(Param); | ||||
3701 | } | ||||
3702 | |||||
3703 | New->setParams(Params); | ||||
3704 | } | ||||
3705 | |||||
3706 | return MergeCompatibleFunctionDecls(New, Old, S, MergeTypeWithOld); | ||||
3707 | } | ||||
3708 | |||||
3709 | // Check if the function types are compatible when pointer size address | ||||
3710 | // spaces are ignored. | ||||
3711 | if (Context.hasSameFunctionTypeIgnoringPtrSizes(OldQType, NewQType)) | ||||
3712 | return false; | ||||
3713 | |||||
3714 | // GNU C permits a K&R definition to follow a prototype declaration | ||||
3715 | // if the declared types of the parameters in the K&R definition | ||||
3716 | // match the types in the prototype declaration, even when the | ||||
3717 | // promoted types of the parameters from the K&R definition differ | ||||
3718 | // from the types in the prototype. GCC then keeps the types from | ||||
3719 | // the prototype. | ||||
3720 | // | ||||
3721 | // If a variadic prototype is followed by a non-variadic K&R definition, | ||||
3722 | // the K&R definition becomes variadic. This is sort of an edge case, but | ||||
3723 | // it's legal per the standard depending on how you read C99 6.7.5.3p15 and | ||||
3724 | // C99 6.9.1p8. | ||||
3725 | if (!getLangOpts().CPlusPlus && | ||||
3726 | Old->hasPrototype() && !New->hasPrototype() && | ||||
3727 | New->getType()->getAs<FunctionProtoType>() && | ||||
3728 | Old->getNumParams() == New->getNumParams()) { | ||||
3729 | SmallVector<QualType, 16> ArgTypes; | ||||
3730 | SmallVector<GNUCompatibleParamWarning, 16> Warnings; | ||||
3731 | const FunctionProtoType *OldProto | ||||
3732 | = Old->getType()->getAs<FunctionProtoType>(); | ||||
3733 | const FunctionProtoType *NewProto | ||||
3734 | = New->getType()->getAs<FunctionProtoType>(); | ||||
3735 | |||||
3736 | // Determine whether this is the GNU C extension. | ||||
3737 | QualType MergedReturn = Context.mergeTypes(OldProto->getReturnType(), | ||||
3738 | NewProto->getReturnType()); | ||||
3739 | bool LooseCompatible = !MergedReturn.isNull(); | ||||
3740 | for (unsigned Idx = 0, End = Old->getNumParams(); | ||||
3741 | LooseCompatible && Idx != End; ++Idx) { | ||||
3742 | ParmVarDecl *OldParm = Old->getParamDecl(Idx); | ||||
3743 | ParmVarDecl *NewParm = New->getParamDecl(Idx); | ||||
3744 | if (Context.typesAreCompatible(OldParm->getType(), | ||||
3745 | NewProto->getParamType(Idx))) { | ||||
3746 | ArgTypes.push_back(NewParm->getType()); | ||||
3747 | } else if (Context.typesAreCompatible(OldParm->getType(), | ||||
3748 | NewParm->getType(), | ||||
3749 | /*CompareUnqualified=*/true)) { | ||||
3750 | GNUCompatibleParamWarning Warn = { OldParm, NewParm, | ||||
3751 | NewProto->getParamType(Idx) }; | ||||
3752 | Warnings.push_back(Warn); | ||||
3753 | ArgTypes.push_back(NewParm->getType()); | ||||
3754 | } else | ||||
3755 | LooseCompatible = false; | ||||
3756 | } | ||||
3757 | |||||
3758 | if (LooseCompatible) { | ||||
3759 | for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { | ||||
3760 | Diag(Warnings[Warn].NewParm->getLocation(), | ||||
3761 | diag::ext_param_promoted_not_compatible_with_prototype) | ||||
3762 | << Warnings[Warn].PromotedType | ||||
3763 | << Warnings[Warn].OldParm->getType(); | ||||
3764 | if (Warnings[Warn].OldParm->getLocation().isValid()) | ||||
3765 | Diag(Warnings[Warn].OldParm->getLocation(), | ||||
3766 | diag::note_previous_declaration); | ||||
3767 | } | ||||
3768 | |||||
3769 | if (MergeTypeWithOld) | ||||
3770 | New->setType(Context.getFunctionType(MergedReturn, ArgTypes, | ||||
3771 | OldProto->getExtProtoInfo())); | ||||
3772 | return MergeCompatibleFunctionDecls(New, Old, S, MergeTypeWithOld); | ||||
3773 | } | ||||
3774 | |||||
3775 | // Fall through to diagnose conflicting types. | ||||
3776 | } | ||||
3777 | |||||
3778 | // A function that has already been declared has been redeclared or | ||||
3779 | // defined with a different type; show an appropriate diagnostic. | ||||
3780 | |||||
3781 | // If the previous declaration was an implicitly-generated builtin | ||||
3782 | // declaration, then at the very least we should use a specialized note. | ||||
3783 | unsigned BuiltinID; | ||||
3784 | if (Old->isImplicit() && (BuiltinID = Old->getBuiltinID())) { | ||||
3785 | // If it's actually a library-defined builtin function like 'malloc' | ||||
3786 | // or 'printf', just warn about the incompatible redeclaration. | ||||
3787 | if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { | ||||
3788 | Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; | ||||
3789 | Diag(OldLocation, diag::note_previous_builtin_declaration) | ||||
3790 | << Old << Old->getType(); | ||||
3791 | return false; | ||||
3792 | } | ||||
3793 | |||||
3794 | PrevDiag = diag::note_previous_builtin_declaration; | ||||
3795 | } | ||||
3796 | |||||
3797 | Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); | ||||
3798 | Diag(OldLocation, PrevDiag) << Old << Old->getType(); | ||||
3799 | return true; | ||||
3800 | } | ||||
3801 | |||||
3802 | /// Completes the merge of two function declarations that are | ||||
3803 | /// known to be compatible. | ||||
3804 | /// | ||||
3805 | /// This routine handles the merging of attributes and other | ||||
3806 | /// properties of function declarations from the old declaration to | ||||
3807 | /// the new declaration, once we know that New is in fact a | ||||
3808 | /// redeclaration of Old. | ||||
3809 | /// | ||||
3810 | /// \returns false | ||||
3811 | bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old, | ||||
3812 | Scope *S, bool MergeTypeWithOld) { | ||||
3813 | // Merge the attributes | ||||
3814 | mergeDeclAttributes(New, Old); | ||||
3815 | |||||
3816 | // Merge "pure" flag. | ||||
3817 | if (Old->isPure()) | ||||
3818 | New->setPure(); | ||||
3819 | |||||
3820 | // Merge "used" flag. | ||||
3821 | if (Old->getMostRecentDecl()->isUsed(false)) | ||||
3822 | New->setIsUsed(); | ||||
3823 | |||||
3824 | // Merge attributes from the parameters. These can mismatch with K&R | ||||
3825 | // declarations. | ||||
3826 | if (New->getNumParams() == Old->getNumParams()) | ||||
3827 | for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) { | ||||
3828 | ParmVarDecl *NewParam = New->getParamDecl(i); | ||||
3829 | ParmVarDecl *OldParam = Old->getParamDecl(i); | ||||
3830 | mergeParamDeclAttributes(NewParam, OldParam, *this); | ||||
3831 | mergeParamDeclTypes(NewParam, OldParam, *this); | ||||
3832 | } | ||||
3833 | |||||
3834 | if (getLangOpts().CPlusPlus) | ||||
3835 | return MergeCXXFunctionDecl(New, Old, S); | ||||
3836 | |||||
3837 | // Merge the function types so the we get the composite types for the return | ||||
3838 | // and argument types. Per C11 6.2.7/4, only update the type if the old decl | ||||
3839 | // was visible. | ||||
3840 | QualType Merged = Context.mergeTypes(Old->getType(), New->getType()); | ||||
3841 | if (!Merged.isNull() && MergeTypeWithOld) | ||||
3842 | New->setType(Merged); | ||||
3843 | |||||
3844 | return false; | ||||
3845 | } | ||||
3846 | |||||
3847 | void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, | ||||
3848 | ObjCMethodDecl *oldMethod) { | ||||
3849 | // Merge the attributes, including deprecated/unavailable | ||||
3850 | AvailabilityMergeKind MergeKind = | ||||
3851 | isa<ObjCProtocolDecl>(oldMethod->getDeclContext()) | ||||
3852 | ? AMK_ProtocolImplementation | ||||
3853 | : isa<ObjCImplDecl>(newMethod->getDeclContext()) ? AMK_Redeclaration | ||||
3854 | : AMK_Override; | ||||
3855 | |||||
3856 | mergeDeclAttributes(newMethod, oldMethod, MergeKind); | ||||
3857 | |||||
3858 | // Merge attributes from the parameters. | ||||
3859 | ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(), | ||||
3860 | oe = oldMethod->param_end(); | ||||
3861 | for (ObjCMethodDecl::param_iterator | ||||
3862 | ni = newMethod->param_begin(), ne = newMethod->param_end(); | ||||
3863 | ni != ne && oi != oe; ++ni, ++oi) | ||||
3864 | mergeParamDeclAttributes(*ni, *oi, *this); | ||||
3865 | |||||
3866 | CheckObjCMethodOverride(newMethod, oldMethod); | ||||
3867 | } | ||||
3868 | |||||
3869 | static void diagnoseVarDeclTypeMismatch(Sema &S, VarDecl *New, VarDecl* Old) { | ||||
3870 | assert(!S.Context.hasSameType(New->getType(), Old->getType()))((!S.Context.hasSameType(New->getType(), Old->getType() )) ? static_cast<void> (0) : __assert_fail ("!S.Context.hasSameType(New->getType(), Old->getType())" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 3870, __PRETTY_FUNCTION__)); | ||||
3871 | |||||
3872 | S.Diag(New->getLocation(), New->isThisDeclarationADefinition() | ||||
3873 | ? diag::err_redefinition_different_type | ||||
3874 | : diag::err_redeclaration_different_type) | ||||
3875 | << New->getDeclName() << New->getType() << Old->getType(); | ||||
3876 | |||||
3877 | diag::kind PrevDiag; | ||||
3878 | SourceLocation OldLocation; | ||||
3879 | std::tie(PrevDiag, OldLocation) | ||||
3880 | = getNoteDiagForInvalidRedeclaration(Old, New); | ||||
3881 | S.Diag(OldLocation, PrevDiag); | ||||
3882 | New->setInvalidDecl(); | ||||
3883 | } | ||||
3884 | |||||
3885 | /// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and | ||||
3886 | /// scope as a previous declaration 'Old'. Figure out how to merge their types, | ||||
3887 | /// emitting diagnostics as appropriate. | ||||
3888 | /// | ||||
3889 | /// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back | ||||
3890 | /// to here in AddInitializerToDecl. We can't check them before the initializer | ||||
3891 | /// is attached. | ||||
3892 | void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old, | ||||
3893 | bool MergeTypeWithOld) { | ||||
3894 | if (New->isInvalidDecl() || Old->isInvalidDecl()) | ||||
3895 | return; | ||||
3896 | |||||
3897 | QualType MergedT; | ||||
3898 | if (getLangOpts().CPlusPlus) { | ||||
3899 | if (New->getType()->isUndeducedType()) { | ||||
3900 | // We don't know what the new type is until the initializer is attached. | ||||
3901 | return; | ||||
3902 | } else if (Context.hasSameType(New->getType(), Old->getType())) { | ||||
3903 | // These could still be something that needs exception specs checked. | ||||
3904 | return MergeVarDeclExceptionSpecs(New, Old); | ||||
3905 | } | ||||
3906 | // C++ [basic.link]p10: | ||||
3907 | // [...] the types specified by all declarations referring to a given | ||||
3908 | // object or function shall be identical, except that declarations for an | ||||
3909 | // array object can specify array types that differ by the presence or | ||||
3910 | // absence of a major array bound (8.3.4). | ||||
3911 | else if (Old->getType()->isArrayType() && New->getType()->isArrayType()) { | ||||
3912 | const ArrayType *OldArray = Context.getAsArrayType(Old->getType()); | ||||
3913 | const ArrayType *NewArray = Context.getAsArrayType(New->getType()); | ||||
3914 | |||||
3915 | // We are merging a variable declaration New into Old. If it has an array | ||||
3916 | // bound, and that bound differs from Old's bound, we should diagnose the | ||||
3917 | // mismatch. | ||||
3918 | if (!NewArray->isIncompleteArrayType() && !NewArray->isDependentType()) { | ||||
3919 | for (VarDecl *PrevVD = Old->getMostRecentDecl(); PrevVD; | ||||
3920 | PrevVD = PrevVD->getPreviousDecl()) { | ||||
3921 | QualType PrevVDTy = PrevVD->getType(); | ||||
3922 | if (PrevVDTy->isIncompleteArrayType() || PrevVDTy->isDependentType()) | ||||
3923 | continue; | ||||
3924 | |||||
3925 | if (!Context.hasSameType(New->getType(), PrevVDTy)) | ||||
3926 | return diagnoseVarDeclTypeMismatch(*this, New, PrevVD); | ||||
3927 | } | ||||
3928 | } | ||||
3929 | |||||
3930 | if (OldArray->isIncompleteArrayType() && NewArray->isArrayType()) { | ||||
3931 | if (Context.hasSameType(OldArray->getElementType(), | ||||
3932 | NewArray->getElementType())) | ||||
3933 | MergedT = New->getType(); | ||||
3934 | } | ||||
3935 | // FIXME: Check visibility. New is hidden but has a complete type. If New | ||||
3936 | // has no array bound, it should not inherit one from Old, if Old is not | ||||
3937 | // visible. | ||||
3938 | else if (OldArray->isArrayType() && NewArray->isIncompleteArrayType()) { | ||||
3939 | if (Context.hasSameType(OldArray->getElementType(), | ||||
3940 | NewArray->getElementType())) | ||||
3941 | MergedT = Old->getType(); | ||||
3942 | } | ||||
3943 | } | ||||
3944 | else if (New->getType()->isObjCObjectPointerType() && | ||||
3945 | Old->getType()->isObjCObjectPointerType()) { | ||||
3946 | MergedT = Context.mergeObjCGCQualifiers(New->getType(), | ||||
3947 | Old->getType()); | ||||
3948 | } | ||||
3949 | } else { | ||||
3950 | // C 6.2.7p2: | ||||
3951 | // All declarations that refer to the same object or function shall have | ||||
3952 | // compatible type. | ||||
3953 | MergedT = Context.mergeTypes(New->getType(), Old->getType()); | ||||
3954 | } | ||||
3955 | if (MergedT.isNull()) { | ||||
3956 | // It's OK if we couldn't merge types if either type is dependent, for a | ||||
3957 | // block-scope variable. In other cases (static data members of class | ||||
3958 | // templates, variable templates, ...), we require the types to be | ||||
3959 | // equivalent. | ||||
3960 | // FIXME: The C++ standard doesn't say anything about this. | ||||
3961 | if ((New->getType()->isDependentType() || | ||||
3962 | Old->getType()->isDependentType()) && New->isLocalVarDecl()) { | ||||
3963 | // If the old type was dependent, we can't merge with it, so the new type | ||||
3964 | // becomes dependent for now. We'll reproduce the original type when we | ||||
3965 | // instantiate the TypeSourceInfo for the variable. | ||||
3966 | if (!New->getType()->isDependentType() && MergeTypeWithOld) | ||||
3967 | New->setType(Context.DependentTy); | ||||
3968 | return; | ||||
3969 | } | ||||
3970 | return diagnoseVarDeclTypeMismatch(*this, New, Old); | ||||
3971 | } | ||||
3972 | |||||
3973 | // Don't actually update the type on the new declaration if the old | ||||
3974 | // declaration was an extern declaration in a different scope. | ||||
3975 | if (MergeTypeWithOld) | ||||
3976 | New->setType(MergedT); | ||||
3977 | } | ||||
3978 | |||||
3979 | static bool mergeTypeWithPrevious(Sema &S, VarDecl *NewVD, VarDecl *OldVD, | ||||
3980 | LookupResult &Previous) { | ||||
3981 | // C11 6.2.7p4: | ||||
3982 | // For an identifier with internal or external linkage declared | ||||
3983 | // in a scope in which a prior declaration of that identifier is | ||||
3984 | // visible, if the prior declaration specifies internal or | ||||
3985 | // external linkage, the type of the identifier at the later | ||||
3986 | // declaration becomes the composite type. | ||||
3987 | // | ||||
3988 | // If the variable isn't visible, we do not merge with its type. | ||||
3989 | if (Previous.isShadowed()) | ||||
3990 | return false; | ||||
3991 | |||||
3992 | if (S.getLangOpts().CPlusPlus) { | ||||
3993 | // C++11 [dcl.array]p3: | ||||
3994 | // If there is a preceding declaration of the entity in the same | ||||
3995 | // scope in which the bound was specified, an omitted array bound | ||||
3996 | // is taken to be the same as in that earlier declaration. | ||||
3997 | return NewVD->isPreviousDeclInSameBlockScope() || | ||||
3998 | (!OldVD->getLexicalDeclContext()->isFunctionOrMethod() && | ||||
3999 | !NewVD->getLexicalDeclContext()->isFunctionOrMethod()); | ||||
4000 | } else { | ||||
4001 | // If the old declaration was function-local, don't merge with its | ||||
4002 | // type unless we're in the same function. | ||||
4003 | return !OldVD->getLexicalDeclContext()->isFunctionOrMethod() || | ||||
4004 | OldVD->getLexicalDeclContext() == NewVD->getLexicalDeclContext(); | ||||
4005 | } | ||||
4006 | } | ||||
4007 | |||||
4008 | /// MergeVarDecl - We just parsed a variable 'New' which has the same name | ||||
4009 | /// and scope as a previous declaration 'Old'. Figure out how to resolve this | ||||
4010 | /// situation, merging decls or emitting diagnostics as appropriate. | ||||
4011 | /// | ||||
4012 | /// Tentative definition rules (C99 6.9.2p2) are checked by | ||||
4013 | /// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative | ||||
4014 | /// definitions here, since the initializer hasn't been attached. | ||||
4015 | /// | ||||
4016 | void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { | ||||
4017 | // If the new decl is already invalid, don't do any other checking. | ||||
4018 | if (New->isInvalidDecl()) | ||||
4019 | return; | ||||
4020 | |||||
4021 | if (!shouldLinkPossiblyHiddenDecl(Previous, New)) | ||||
4022 | return; | ||||
4023 | |||||
4024 | VarTemplateDecl *NewTemplate = New->getDescribedVarTemplate(); | ||||
4025 | |||||
4026 | // Verify the old decl was also a variable or variable template. | ||||
4027 | VarDecl *Old = nullptr; | ||||
4028 | VarTemplateDecl *OldTemplate = nullptr; | ||||
4029 | if (Previous.isSingleResult()) { | ||||
4030 | if (NewTemplate) { | ||||
4031 | OldTemplate = dyn_cast<VarTemplateDecl>(Previous.getFoundDecl()); | ||||
4032 | Old = OldTemplate ? OldTemplate->getTemplatedDecl() : nullptr; | ||||
4033 | |||||
4034 | if (auto *Shadow = | ||||
4035 | dyn_cast<UsingShadowDecl>(Previous.getRepresentativeDecl())) | ||||
4036 | if (checkUsingShadowRedecl<VarTemplateDecl>(*this, Shadow, NewTemplate)) | ||||
4037 | return New->setInvalidDecl(); | ||||
4038 | } else { | ||||
4039 | Old = dyn_cast<VarDecl>(Previous.getFoundDecl()); | ||||
4040 | |||||
4041 | if (auto *Shadow = | ||||
4042 | dyn_cast<UsingShadowDecl>(Previous.getRepresentativeDecl())) | ||||
4043 | if (checkUsingShadowRedecl<VarDecl>(*this, Shadow, New)) | ||||
4044 | return New->setInvalidDecl(); | ||||
4045 | } | ||||
4046 | } | ||||
4047 | if (!Old) { | ||||
4048 | Diag(New->getLocation(), diag::err_redefinition_different_kind) | ||||
4049 | << New->getDeclName(); | ||||
4050 | notePreviousDefinition(Previous.getRepresentativeDecl(), | ||||
4051 | New->getLocation()); | ||||
4052 | return New->setInvalidDecl(); | ||||
4053 | } | ||||
4054 | |||||
4055 | // Ensure the template parameters are compatible. | ||||
4056 | if (NewTemplate && | ||||
4057 | !TemplateParameterListsAreEqual(NewTemplate->getTemplateParameters(), | ||||
4058 | OldTemplate->getTemplateParameters(), | ||||
4059 | /*Complain=*/true, TPL_TemplateMatch)) | ||||
4060 | return New->setInvalidDecl(); | ||||
4061 | |||||
4062 | // C++ [class.mem]p1: | ||||
4063 | // A member shall not be declared twice in the member-specification [...] | ||||
4064 | // | ||||
4065 | // Here, we need only consider static data members. | ||||
4066 | if (Old->isStaticDataMember() && !New->isOutOfLine()) { | ||||
4067 | Diag(New->getLocation(), diag::err_duplicate_member) | ||||
4068 | << New->getIdentifier(); | ||||
4069 | Diag(Old->getLocation(), diag::note_previous_declaration); | ||||
4070 | New->setInvalidDecl(); | ||||
4071 | } | ||||
4072 | |||||
4073 | mergeDeclAttributes(New, Old); | ||||
4074 | // Warn if an already-declared variable is made a weak_import in a subsequent | ||||
4075 | // declaration | ||||
4076 | if (New->hasAttr<WeakImportAttr>() && | ||||
4077 | Old->getStorageClass() == SC_None && | ||||
4078 | !Old->hasAttr<WeakImportAttr>()) { | ||||
4079 | Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); | ||||
4080 | notePreviousDefinition(Old, New->getLocation()); | ||||
4081 | // Remove weak_import attribute on new declaration. | ||||
4082 | New->dropAttr<WeakImportAttr>(); | ||||
4083 | } | ||||
4084 | |||||
4085 | if (New->hasAttr<InternalLinkageAttr>() && | ||||
4086 | !Old->hasAttr<InternalLinkageAttr>()) { | ||||
4087 | Diag(New->getLocation(), diag::err_internal_linkage_redeclaration) | ||||
4088 | << New->getDeclName(); | ||||
4089 | notePreviousDefinition(Old, New->getLocation()); | ||||
4090 | New->dropAttr<InternalLinkageAttr>(); | ||||
4091 | } | ||||
4092 | |||||
4093 | // Merge the types. | ||||
4094 | VarDecl *MostRecent = Old->getMostRecentDecl(); | ||||
4095 | if (MostRecent != Old) { | ||||
4096 | MergeVarDeclTypes(New, MostRecent, | ||||
4097 | mergeTypeWithPrevious(*this, New, MostRecent, Previous)); | ||||
4098 | if (New->isInvalidDecl()) | ||||
4099 | return; | ||||
4100 | } | ||||
4101 | |||||
4102 | MergeVarDeclTypes(New, Old, mergeTypeWithPrevious(*this, New, Old, Previous)); | ||||
4103 | if (New->isInvalidDecl()) | ||||
4104 | return; | ||||
4105 | |||||
4106 | diag::kind PrevDiag; | ||||
4107 | SourceLocation OldLocation; | ||||
4108 | std::tie(PrevDiag, OldLocation) = | ||||
4109 | getNoteDiagForInvalidRedeclaration(Old, New); | ||||
4110 | |||||
4111 | // [dcl.stc]p8: Check if we have a non-static decl followed by a static. | ||||
4112 | if (New->getStorageClass() == SC_Static && | ||||
4113 | !New->isStaticDataMember() && | ||||
4114 | Old->hasExternalFormalLinkage()) { | ||||
4115 | if (getLangOpts().MicrosoftExt) { | ||||
4116 | Diag(New->getLocation(), diag::ext_static_non_static) | ||||
4117 | << New->getDeclName(); | ||||
4118 | Diag(OldLocation, PrevDiag); | ||||
4119 | } else { | ||||
4120 | Diag(New->getLocation(), diag::err_static_non_static) | ||||
4121 | << New->getDeclName(); | ||||
4122 | Diag(OldLocation, PrevDiag); | ||||
4123 | return New->setInvalidDecl(); | ||||
4124 | } | ||||
4125 | } | ||||
4126 | // C99 6.2.2p4: | ||||
4127 | // For an identifier declared with the storage-class specifier | ||||
4128 | // extern in a scope in which a prior declaration of that | ||||
4129 | // identifier is visible,23) if the prior declaration specifies | ||||
4130 | // internal or external linkage, the linkage of the identifier at | ||||
4131 | // the later declaration is the same as the linkage specified at | ||||
4132 | // the prior declaration. If no prior declaration is visible, or | ||||
4133 | // if the prior declaration specifies no linkage, then the | ||||
4134 | // identifier has external linkage. | ||||
4135 | if (New->hasExternalStorage() && Old->hasLinkage()) | ||||
4136 | /* Okay */; | ||||
4137 | else if (New->getCanonicalDecl()->getStorageClass() != SC_Static && | ||||
4138 | !New->isStaticDataMember() && | ||||
4139 | Old->getCanonicalDecl()->getStorageClass() == SC_Static) { | ||||
4140 | Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); | ||||
4141 | Diag(OldLocation, PrevDiag); | ||||
4142 | return New->setInvalidDecl(); | ||||
4143 | } | ||||
4144 | |||||
4145 | // Check if extern is followed by non-extern and vice-versa. | ||||
4146 | if (New->hasExternalStorage() && | ||||
4147 | !Old->hasLinkage() && Old->isLocalVarDeclOrParm()) { | ||||
4148 | Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); | ||||
4149 | Diag(OldLocation, PrevDiag); | ||||
4150 | return New->setInvalidDecl(); | ||||
4151 | } | ||||
4152 | if (Old->hasLinkage() && New->isLocalVarDeclOrParm() && | ||||
4153 | !New->hasExternalStorage()) { | ||||
4154 | Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); | ||||
4155 | Diag(OldLocation, PrevDiag); | ||||
4156 | return New->setInvalidDecl(); | ||||
4157 | } | ||||
4158 | |||||
4159 | if (CheckRedeclarationModuleOwnership(New, Old)) | ||||
4160 | return; | ||||
4161 | |||||
4162 | // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. | ||||
4163 | |||||
4164 | // FIXME: The test for external storage here seems wrong? We still | ||||
4165 | // need to check for mismatches. | ||||
4166 | if (!New->hasExternalStorage() && !New->isFileVarDecl() && | ||||
4167 | // Don't complain about out-of-line definitions of static members. | ||||
4168 | !(Old->getLexicalDeclContext()->isRecord() && | ||||
4169 | !New->getLexicalDeclContext()->isRecord())) { | ||||
4170 | Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); | ||||
4171 | Diag(OldLocation, PrevDiag); | ||||
4172 | return New->setInvalidDecl(); | ||||
4173 | } | ||||
4174 | |||||
4175 | if (New->isInline() && !Old->getMostRecentDecl()->isInline()) { | ||||
4176 | if (VarDecl *Def = Old->getDefinition()) { | ||||
4177 | // C++1z [dcl.fcn.spec]p4: | ||||
4178 | // If the definition of a variable appears in a translation unit before | ||||
4179 | // its first declaration as inline, the program is ill-formed. | ||||
4180 | Diag(New->getLocation(), diag::err_inline_decl_follows_def) << New; | ||||
4181 | Diag(Def->getLocation(), diag::note_previous_definition); | ||||
4182 | } | ||||
4183 | } | ||||
4184 | |||||
4185 | // If this redeclaration makes the variable inline, we may need to add it to | ||||
4186 | // UndefinedButUsed. | ||||
4187 | if (!Old->isInline() && New->isInline() && Old->isUsed(false) && | ||||
4188 | !Old->getDefinition() && !New->isThisDeclarationADefinition()) | ||||
4189 | UndefinedButUsed.insert(std::make_pair(Old->getCanonicalDecl(), | ||||
4190 | SourceLocation())); | ||||
4191 | |||||
4192 | if (New->getTLSKind() != Old->getTLSKind()) { | ||||
4193 | if (!Old->getTLSKind()) { | ||||
4194 | Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); | ||||
4195 | Diag(OldLocation, PrevDiag); | ||||
4196 | } else if (!New->getTLSKind()) { | ||||
4197 | Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); | ||||
4198 | Diag(OldLocation, PrevDiag); | ||||
4199 | } else { | ||||
4200 | // Do not allow redeclaration to change the variable between requiring | ||||
4201 | // static and dynamic initialization. | ||||
4202 | // FIXME: GCC allows this, but uses the TLS keyword on the first | ||||
4203 | // declaration to determine the kind. Do we need to be compatible here? | ||||
4204 | Diag(New->getLocation(), diag::err_thread_thread_different_kind) | ||||
4205 | << New->getDeclName() << (New->getTLSKind() == VarDecl::TLS_Dynamic); | ||||
4206 | Diag(OldLocation, PrevDiag); | ||||
4207 | } | ||||
4208 | } | ||||
4209 | |||||
4210 | // C++ doesn't have tentative definitions, so go right ahead and check here. | ||||
4211 | if (getLangOpts().CPlusPlus && | ||||
4212 | New->isThisDeclarationADefinition() == VarDecl::Definition) { | ||||
4213 | if (Old->isStaticDataMember() && Old->getCanonicalDecl()->isInline() && | ||||
4214 | Old->getCanonicalDecl()->isConstexpr()) { | ||||
4215 | // This definition won't be a definition any more once it's been merged. | ||||
4216 | Diag(New->getLocation(), | ||||
4217 | diag::warn_deprecated_redundant_constexpr_static_def); | ||||
4218 | } else if (VarDecl *Def = Old->getDefinition()) { | ||||
4219 | if (checkVarDeclRedefinition(Def, New)) | ||||
4220 | return; | ||||
4221 | } | ||||
4222 | } | ||||
4223 | |||||
4224 | if (haveIncompatibleLanguageLinkages(Old, New)) { | ||||
4225 | Diag(New->getLocation(), diag::err_different_language_linkage) << New; | ||||
4226 | Diag(OldLocation, PrevDiag); | ||||
4227 | New->setInvalidDecl(); | ||||
4228 | return; | ||||
4229 | } | ||||
4230 | |||||
4231 | // Merge "used" flag. | ||||
4232 | if (Old->getMostRecentDecl()->isUsed(false)) | ||||
4233 | New->setIsUsed(); | ||||
4234 | |||||
4235 | // Keep a chain of previous declarations. | ||||
4236 | New->setPreviousDecl(Old); | ||||
4237 | if (NewTemplate) | ||||
4238 | NewTemplate->setPreviousDecl(OldTemplate); | ||||
4239 | adjustDeclContextForDeclaratorDecl(New, Old); | ||||
4240 | |||||
4241 | // Inherit access appropriately. | ||||
4242 | New->setAccess(Old->getAccess()); | ||||
4243 | if (NewTemplate) | ||||
4244 | NewTemplate->setAccess(New->getAccess()); | ||||
4245 | |||||
4246 | if (Old->isInline()) | ||||
4247 | New->setImplicitlyInline(); | ||||
4248 | } | ||||
4249 | |||||
4250 | void Sema::notePreviousDefinition(const NamedDecl *Old, SourceLocation New) { | ||||
4251 | SourceManager &SrcMgr = getSourceManager(); | ||||
4252 | auto FNewDecLoc = SrcMgr.getDecomposedLoc(New); | ||||
4253 | auto FOldDecLoc = SrcMgr.getDecomposedLoc(Old->getLocation()); | ||||
4254 | auto *FNew = SrcMgr.getFileEntryForID(FNewDecLoc.first); | ||||
4255 | auto *FOld = SrcMgr.getFileEntryForID(FOldDecLoc.first); | ||||
4256 | auto &HSI = PP.getHeaderSearchInfo(); | ||||
4257 | StringRef HdrFilename = | ||||
4258 | SrcMgr.getFilename(SrcMgr.getSpellingLoc(Old->getLocation())); | ||||
4259 | |||||
4260 | auto noteFromModuleOrInclude = [&](Module *Mod, | ||||
4261 | SourceLocation IncLoc) -> bool { | ||||
4262 | // Redefinition errors with modules are common with non modular mapped | ||||
4263 | // headers, example: a non-modular header H in module A that also gets | ||||
4264 | // included directly in a TU. Pointing twice to the same header/definition | ||||
4265 | // is confusing, try to get better diagnostics when modules is on. | ||||
4266 | if (IncLoc.isValid()) { | ||||
4267 | if (Mod) { | ||||
4268 | Diag(IncLoc, diag::note_redefinition_modules_same_file) | ||||
4269 | << HdrFilename.str() << Mod->getFullModuleName(); | ||||
4270 | if (!Mod->DefinitionLoc.isInvalid()) | ||||
4271 | Diag(Mod->DefinitionLoc, diag::note_defined_here) | ||||
4272 | << Mod->getFullModuleName(); | ||||
4273 | } else { | ||||
4274 | Diag(IncLoc, diag::note_redefinition_include_same_file) | ||||
4275 | << HdrFilename.str(); | ||||
4276 | } | ||||
4277 | return true; | ||||
4278 | } | ||||
4279 | |||||
4280 | return false; | ||||
4281 | }; | ||||
4282 | |||||
4283 | // Is it the same file and same offset? Provide more information on why | ||||
4284 | // this leads to a redefinition error. | ||||
4285 | if (FNew == FOld && FNewDecLoc.second == FOldDecLoc.second) { | ||||
4286 | SourceLocation OldIncLoc = SrcMgr.getIncludeLoc(FOldDecLoc.first); | ||||
4287 | SourceLocation NewIncLoc = SrcMgr.getIncludeLoc(FNewDecLoc.first); | ||||
4288 | bool EmittedDiag = | ||||
4289 | noteFromModuleOrInclude(Old->getOwningModule(), OldIncLoc); | ||||
4290 | EmittedDiag |= noteFromModuleOrInclude(getCurrentModule(), NewIncLoc); | ||||
4291 | |||||
4292 | // If the header has no guards, emit a note suggesting one. | ||||
4293 | if (FOld && !HSI.isFileMultipleIncludeGuarded(FOld)) | ||||
4294 | Diag(Old->getLocation(), diag::note_use_ifdef_guards); | ||||
4295 | |||||
4296 | if (EmittedDiag) | ||||
4297 | return; | ||||
4298 | } | ||||
4299 | |||||
4300 | // Redefinition coming from different files or couldn't do better above. | ||||
4301 | if (Old->getLocation().isValid()) | ||||
4302 | Diag(Old->getLocation(), diag::note_previous_definition); | ||||
4303 | } | ||||
4304 | |||||
4305 | /// We've just determined that \p Old and \p New both appear to be definitions | ||||
4306 | /// of the same variable. Either diagnose or fix the problem. | ||||
4307 | bool Sema::checkVarDeclRedefinition(VarDecl *Old, VarDecl *New) { | ||||
4308 | if (!hasVisibleDefinition(Old) && | ||||
4309 | (New->getFormalLinkage() == InternalLinkage || | ||||
4310 | New->isInline() || | ||||
4311 | New->getDescribedVarTemplate() || | ||||
4312 | New->getNumTemplateParameterLists() || | ||||
4313 | New->getDeclContext()->isDependentContext())) { | ||||
4314 | // The previous definition is hidden, and multiple definitions are | ||||
4315 | // permitted (in separate TUs). Demote this to a declaration. | ||||
4316 | New->demoteThisDefinitionToDeclaration(); | ||||
4317 | |||||
4318 | // Make the canonical definition visible. | ||||
4319 | if (auto *OldTD = Old->getDescribedVarTemplate()) | ||||
4320 | makeMergedDefinitionVisible(OldTD); | ||||
4321 | makeMergedDefinitionVisible(Old); | ||||
4322 | return false; | ||||
4323 | } else { | ||||
4324 | Diag(New->getLocation(), diag::err_redefinition) << New; | ||||
4325 | notePreviousDefinition(Old, New->getLocation()); | ||||
4326 | New->setInvalidDecl(); | ||||
4327 | return true; | ||||
4328 | } | ||||
4329 | } | ||||
4330 | |||||
4331 | /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with | ||||
4332 | /// no declarator (e.g. "struct foo;") is parsed. | ||||
4333 | Decl * | ||||
4334 | Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS, | ||||
4335 | RecordDecl *&AnonRecord) { | ||||
4336 | return ParsedFreeStandingDeclSpec(S, AS, DS, MultiTemplateParamsArg(), false, | ||||
4337 | AnonRecord); | ||||
4338 | } | ||||
4339 | |||||
4340 | // The MS ABI changed between VS2013 and VS2015 with regard to numbers used to | ||||
4341 | // disambiguate entities defined in different scopes. | ||||
4342 | // While the VS2015 ABI fixes potential miscompiles, it is also breaks | ||||
4343 | // compatibility. | ||||
4344 | // We will pick our mangling number depending on which version of MSVC is being | ||||
4345 | // targeted. | ||||
4346 | static unsigned getMSManglingNumber(const LangOptions &LO, Scope *S) { | ||||
4347 | return LO.isCompatibleWithMSVC(LangOptions::MSVC2015) | ||||
4348 | ? S->getMSCurManglingNumber() | ||||
4349 | : S->getMSLastManglingNumber(); | ||||
4350 | } | ||||
4351 | |||||
4352 | void Sema::handleTagNumbering(const TagDecl *Tag, Scope *TagScope) { | ||||
4353 | if (!Context.getLangOpts().CPlusPlus) | ||||
4354 | return; | ||||
4355 | |||||
4356 | if (isa<CXXRecordDecl>(Tag->getParent())) { | ||||
4357 | // If this tag is the direct child of a class, number it if | ||||
4358 | // it is anonymous. | ||||
4359 | if (!Tag->getName().empty() || Tag->getTypedefNameForAnonDecl()) | ||||
4360 | return; | ||||
4361 | MangleNumberingContext &MCtx = | ||||
4362 | Context.getManglingNumberContext(Tag->getParent()); | ||||
4363 | Context.setManglingNumber( | ||||
4364 | Tag, MCtx.getManglingNumber( | ||||
4365 | Tag, getMSManglingNumber(getLangOpts(), TagScope))); | ||||
4366 | return; | ||||
4367 | } | ||||
4368 | |||||
4369 | // If this tag isn't a direct child of a class, number it if it is local. | ||||
4370 | MangleNumberingContext *MCtx; | ||||
4371 | Decl *ManglingContextDecl; | ||||
4372 | std::tie(MCtx, ManglingContextDecl) = | ||||
4373 | getCurrentMangleNumberContext(Tag->getDeclContext()); | ||||
4374 | if (MCtx) { | ||||
4375 | Context.setManglingNumber( | ||||
4376 | Tag, MCtx->getManglingNumber( | ||||
4377 | Tag, getMSManglingNumber(getLangOpts(), TagScope))); | ||||
4378 | } | ||||
4379 | } | ||||
4380 | |||||
4381 | namespace { | ||||
4382 | struct NonCLikeKind { | ||||
4383 | enum { | ||||
4384 | None, | ||||
4385 | BaseClass, | ||||
4386 | DefaultMemberInit, | ||||
4387 | Lambda, | ||||
4388 | Friend, | ||||
4389 | OtherMember, | ||||
4390 | Invalid, | ||||
4391 | } Kind = None; | ||||
4392 | SourceRange Range; | ||||
4393 | |||||
4394 | explicit operator bool() { return Kind != None; } | ||||
4395 | }; | ||||
4396 | } | ||||
4397 | |||||
4398 | /// Determine whether a class is C-like, according to the rules of C++ | ||||
4399 | /// [dcl.typedef] for anonymous classes with typedef names for linkage. | ||||
4400 | static NonCLikeKind getNonCLikeKindForAnonymousStruct(const CXXRecordDecl *RD) { | ||||
4401 | if (RD->isInvalidDecl()) | ||||
4402 | return {NonCLikeKind::Invalid, {}}; | ||||
4403 | |||||
4404 | // C++ [dcl.typedef]p9: [P1766R1] | ||||
4405 | // An unnamed class with a typedef name for linkage purposes shall not | ||||
4406 | // | ||||
4407 | // -- have any base classes | ||||
4408 | if (RD->getNumBases()) | ||||
4409 | return {NonCLikeKind::BaseClass, | ||||
4410 | SourceRange(RD->bases_begin()->getBeginLoc(), | ||||
4411 | RD->bases_end()[-1].getEndLoc())}; | ||||
4412 | bool Invalid = false; | ||||
4413 | for (Decl *D : RD->decls()) { | ||||
4414 | // Don't complain about things we already diagnosed. | ||||
4415 | if (D->isInvalidDecl()) { | ||||
4416 | Invalid = true; | ||||
4417 | continue; | ||||
4418 | } | ||||
4419 | |||||
4420 | // -- have any [...] default member initializers | ||||
4421 | if (auto *FD = dyn_cast<FieldDecl>(D)) { | ||||
4422 | if (FD->hasInClassInitializer()) { | ||||
4423 | auto *Init = FD->getInClassInitializer(); | ||||
4424 | return {NonCLikeKind::DefaultMemberInit, | ||||
4425 | Init ? Init->getSourceRange() : D->getSourceRange()}; | ||||
4426 | } | ||||
4427 | continue; | ||||
4428 | } | ||||
4429 | |||||
4430 | // FIXME: We don't allow friend declarations. This violates the wording of | ||||
4431 | // P1766, but not the intent. | ||||
4432 | if (isa<FriendDecl>(D)) | ||||
4433 | return {NonCLikeKind::Friend, D->getSourceRange()}; | ||||
4434 | |||||
4435 | // -- declare any members other than non-static data members, member | ||||
4436 | // enumerations, or member classes, | ||||
4437 | if (isa<StaticAssertDecl>(D) || isa<IndirectFieldDecl>(D) || | ||||
4438 | isa<EnumDecl>(D)) | ||||
4439 | continue; | ||||
4440 | auto *MemberRD = dyn_cast<CXXRecordDecl>(D); | ||||
4441 | if (!MemberRD) { | ||||
4442 | if (D->isImplicit()) | ||||
4443 | continue; | ||||
4444 | return {NonCLikeKind::OtherMember, D->getSourceRange()}; | ||||
4445 | } | ||||
4446 | |||||
4447 | // -- contain a lambda-expression, | ||||
4448 | if (MemberRD->isLambda()) | ||||
4449 | return {NonCLikeKind::Lambda, MemberRD->getSourceRange()}; | ||||
4450 | |||||
4451 | // and all member classes shall also satisfy these requirements | ||||
4452 | // (recursively). | ||||
4453 | if (MemberRD->isThisDeclarationADefinition()) { | ||||
4454 | if (auto Kind = getNonCLikeKindForAnonymousStruct(MemberRD)) | ||||
4455 | return Kind; | ||||
4456 | } | ||||
4457 | } | ||||
4458 | |||||
4459 | return {Invalid ? NonCLikeKind::Invalid : NonCLikeKind::None, {}}; | ||||
4460 | } | ||||
4461 | |||||
4462 | void Sema::setTagNameForLinkagePurposes(TagDecl *TagFromDeclSpec, | ||||
4463 | TypedefNameDecl *NewTD) { | ||||
4464 | if (TagFromDeclSpec->isInvalidDecl()) | ||||
4465 | return; | ||||
4466 | |||||
4467 | // Do nothing if the tag already has a name for linkage purposes. | ||||
4468 | if (TagFromDeclSpec->hasNameForLinkage()) | ||||
4469 | return; | ||||
4470 | |||||
4471 | // A well-formed anonymous tag must always be a TUK_Definition. | ||||
4472 | assert(TagFromDeclSpec->isThisDeclarationADefinition())((TagFromDeclSpec->isThisDeclarationADefinition()) ? static_cast <void> (0) : __assert_fail ("TagFromDeclSpec->isThisDeclarationADefinition()" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 4472, __PRETTY_FUNCTION__)); | ||||
4473 | |||||
4474 | // The type must match the tag exactly; no qualifiers allowed. | ||||
4475 | if (!Context.hasSameType(NewTD->getUnderlyingType(), | ||||
4476 | Context.getTagDeclType(TagFromDeclSpec))) { | ||||
4477 | if (getLangOpts().CPlusPlus) | ||||
4478 | Context.addTypedefNameForUnnamedTagDecl(TagFromDeclSpec, NewTD); | ||||
4479 | return; | ||||
4480 | } | ||||
4481 | |||||
4482 | // C++ [dcl.typedef]p9: [P1766R1, applied as DR] | ||||
4483 | // An unnamed class with a typedef name for linkage purposes shall [be | ||||
4484 | // C-like]. | ||||
4485 | // | ||||
4486 | // FIXME: Also diagnose if we've already computed the linkage. That ideally | ||||
4487 | // shouldn't happen, but there are constructs that the language rule doesn't | ||||
4488 | // disallow for which we can't reasonably avoid computing linkage early. | ||||
4489 | const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TagFromDeclSpec); | ||||
4490 | NonCLikeKind NonCLike = RD ? getNonCLikeKindForAnonymousStruct(RD) | ||||
4491 | : NonCLikeKind(); | ||||
4492 | bool ChangesLinkage = TagFromDeclSpec->hasLinkageBeenComputed(); | ||||
4493 | if (NonCLike || ChangesLinkage) { | ||||
4494 | if (NonCLike.Kind == NonCLikeKind::Invalid) | ||||
4495 | return; | ||||
4496 | |||||
4497 | unsigned DiagID = diag::ext_non_c_like_anon_struct_in_typedef; | ||||
4498 | if (ChangesLinkage) { | ||||
4499 | // If the linkage changes, we can't accept this as an extension. | ||||
4500 | if (NonCLike.Kind == NonCLikeKind::None) | ||||
4501 | DiagID = diag::err_typedef_changes_linkage; | ||||
4502 | else | ||||
4503 | DiagID = diag::err_non_c_like_anon_struct_in_typedef; | ||||
4504 | } | ||||
4505 | |||||
4506 | SourceLocation FixitLoc = | ||||
4507 | getLocForEndOfToken(TagFromDeclSpec->getInnerLocStart()); | ||||
4508 | llvm::SmallString<40> TextToInsert; | ||||
4509 | TextToInsert += ' '; | ||||
4510 | TextToInsert += NewTD->getIdentifier()->getName(); | ||||
4511 | |||||
4512 | Diag(FixitLoc, DiagID) | ||||
4513 | << isa<TypeAliasDecl>(NewTD) | ||||
4514 | << FixItHint::CreateInsertion(FixitLoc, TextToInsert); | ||||
4515 | if (NonCLike.Kind != NonCLikeKind::None) { | ||||
4516 | Diag(NonCLike.Range.getBegin(), diag::note_non_c_like_anon_struct) | ||||
4517 | << NonCLike.Kind - 1 << NonCLike.Range; | ||||
4518 | } | ||||
4519 | Diag(NewTD->getLocation(), diag::note_typedef_for_linkage_here) | ||||
4520 | << NewTD << isa<TypeAliasDecl>(NewTD); | ||||
4521 | |||||
4522 | if (ChangesLinkage) | ||||
4523 | return; | ||||
4524 | } | ||||
4525 | |||||
4526 | // Otherwise, set this as the anon-decl typedef for the tag. | ||||
4527 | TagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); | ||||
4528 | } | ||||
4529 | |||||
4530 | static unsigned GetDiagnosticTypeSpecifierID(DeclSpec::TST T) { | ||||
4531 | switch (T) { | ||||
4532 | case DeclSpec::TST_class: | ||||
4533 | return 0; | ||||
4534 | case DeclSpec::TST_struct: | ||||
4535 | return 1; | ||||
4536 | case DeclSpec::TST_interface: | ||||
4537 | return 2; | ||||
4538 | case DeclSpec::TST_union: | ||||
4539 | return 3; | ||||
4540 | case DeclSpec::TST_enum: | ||||
4541 | return 4; | ||||
4542 | default: | ||||
4543 | llvm_unreachable("unexpected type specifier")::llvm::llvm_unreachable_internal("unexpected type specifier" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 4543); | ||||
4544 | } | ||||
4545 | } | ||||
4546 | |||||
4547 | /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with | ||||
4548 | /// no declarator (e.g. "struct foo;") is parsed. It also accepts template | ||||
4549 | /// parameters to cope with template friend declarations. | ||||
4550 | Decl * | ||||
4551 | Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS, | ||||
4552 | MultiTemplateParamsArg TemplateParams, | ||||
4553 | bool IsExplicitInstantiation, | ||||
4554 | RecordDecl *&AnonRecord) { | ||||
4555 | Decl *TagD = nullptr; | ||||
4556 | TagDecl *Tag = nullptr; | ||||
4557 | if (DS.getTypeSpecType() == DeclSpec::TST_class || | ||||
4558 | DS.getTypeSpecType() == DeclSpec::TST_struct || | ||||
4559 | DS.getTypeSpecType() == DeclSpec::TST_interface || | ||||
4560 | DS.getTypeSpecType() == DeclSpec::TST_union || | ||||
4561 | DS.getTypeSpecType() == DeclSpec::TST_enum) { | ||||
4562 | TagD = DS.getRepAsDecl(); | ||||
4563 | |||||
4564 | if (!TagD) // We probably had an error | ||||
4565 | return nullptr; | ||||
4566 | |||||
4567 | // Note that the above type specs guarantee that the | ||||
4568 | // type rep is a Decl, whereas in many of the others | ||||
4569 | // it's a Type. | ||||
4570 | if (isa<TagDecl>(TagD)) | ||||
4571 | Tag = cast<TagDecl>(TagD); | ||||
4572 | else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) | ||||
4573 | Tag = CTD->getTemplatedDecl(); | ||||
4574 | } | ||||
4575 | |||||
4576 | if (Tag) { | ||||
4577 | handleTagNumbering(Tag, S); | ||||
4578 | Tag->setFreeStanding(); | ||||
4579 | if (Tag->isInvalidDecl()) | ||||
4580 | return Tag; | ||||
4581 | } | ||||
4582 | |||||
4583 | if (unsigned TypeQuals = DS.getTypeQualifiers()) { | ||||
4584 | // Enforce C99 6.7.3p2: "Types other than pointer types derived from object | ||||
4585 | // or incomplete types shall not be restrict-qualified." | ||||
4586 | if (TypeQuals & DeclSpec::TQ_restrict) | ||||
4587 | Diag(DS.getRestrictSpecLoc(), | ||||
4588 | diag::err_typecheck_invalid_restrict_not_pointer_noarg) | ||||
4589 | << DS.getSourceRange(); | ||||
4590 | } | ||||
4591 | |||||
4592 | if (DS.isInlineSpecified()) | ||||
4593 | Diag(DS.getInlineSpecLoc(), diag::err_inline_non_function) | ||||
4594 | << getLangOpts().CPlusPlus17; | ||||
4595 | |||||
4596 | if (DS.hasConstexprSpecifier()) { | ||||
4597 | // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations | ||||
4598 | // and definitions of functions and variables. | ||||
4599 | // C++2a [dcl.constexpr]p1: The consteval specifier shall be applied only to | ||||
4600 | // the declaration of a function or function template | ||||
4601 | if (Tag) | ||||
4602 | Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) | ||||
4603 | << GetDiagnosticTypeSpecifierID(DS.getTypeSpecType()) | ||||
4604 | << static_cast<int>(DS.getConstexprSpecifier()); | ||||
4605 | else | ||||
4606 | Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_wrong_decl_kind) | ||||
4607 | << static_cast<int>(DS.getConstexprSpecifier()); | ||||
4608 | // Don't emit warnings after this error. | ||||
4609 | return TagD; | ||||
4610 | } | ||||
4611 | |||||
4612 | DiagnoseFunctionSpecifiers(DS); | ||||
4613 | |||||
4614 | if (DS.isFriendSpecified()) { | ||||
4615 | // If we're dealing with a decl but not a TagDecl, assume that | ||||
4616 | // whatever routines created it handled the friendship aspect. | ||||
4617 | if (TagD && !Tag) | ||||
4618 | return nullptr; | ||||
4619 | return ActOnFriendTypeDecl(S, DS, TemplateParams); | ||||
4620 | } | ||||
4621 | |||||
4622 | const CXXScopeSpec &SS = DS.getTypeSpecScope(); | ||||
4623 | bool IsExplicitSpecialization = | ||||
4624 | !TemplateParams.empty() && TemplateParams.back()->size() == 0; | ||||
4625 | if (Tag && SS.isNotEmpty() && !Tag->isCompleteDefinition() && | ||||
4626 | !IsExplicitInstantiation && !IsExplicitSpecialization && | ||||
4627 | !isa<ClassTemplatePartialSpecializationDecl>(Tag)) { | ||||
4628 | // Per C++ [dcl.type.elab]p1, a class declaration cannot have a | ||||
4629 | // nested-name-specifier unless it is an explicit instantiation | ||||
4630 | // or an explicit specialization. | ||||
4631 | // | ||||
4632 | // FIXME: We allow class template partial specializations here too, per the | ||||
4633 | // obvious intent of DR1819. | ||||
4634 | // | ||||
4635 | // Per C++ [dcl.enum]p1, an opaque-enum-declaration can't either. | ||||
4636 | Diag(SS.getBeginLoc(), diag::err_standalone_class_nested_name_specifier) | ||||
4637 | << GetDiagnosticTypeSpecifierID(DS.getTypeSpecType()) << SS.getRange(); | ||||
4638 | return nullptr; | ||||
4639 | } | ||||
4640 | |||||
4641 | // Track whether this decl-specifier declares anything. | ||||
4642 | bool DeclaresAnything = true; | ||||
4643 | |||||
4644 | // Handle anonymous struct definitions. | ||||
4645 | if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { | ||||
4646 | if (!Record->getDeclName() && Record->isCompleteDefinition() && | ||||
4647 | DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { | ||||
4648 | if (getLangOpts().CPlusPlus || | ||||
4649 | Record->getDeclContext()->isRecord()) { | ||||
4650 | // If CurContext is a DeclContext that can contain statements, | ||||
4651 | // RecursiveASTVisitor won't visit the decls that | ||||
4652 | // BuildAnonymousStructOrUnion() will put into CurContext. | ||||
4653 | // Also store them here so that they can be part of the | ||||
4654 | // DeclStmt that gets created in this case. | ||||
4655 | // FIXME: Also return the IndirectFieldDecls created by | ||||
4656 | // BuildAnonymousStructOr union, for the same reason? | ||||
4657 | if (CurContext->isFunctionOrMethod()) | ||||
4658 | AnonRecord = Record; | ||||
4659 | return BuildAnonymousStructOrUnion(S, DS, AS, Record, | ||||
4660 | Context.getPrintingPolicy()); | ||||
4661 | } | ||||
4662 | |||||
4663 | DeclaresAnything = false; | ||||
4664 | } | ||||
4665 | } | ||||
4666 | |||||
4667 | // C11 6.7.2.1p2: | ||||
4668 | // A struct-declaration that does not declare an anonymous structure or | ||||
4669 | // anonymous union shall contain a struct-declarator-list. | ||||
4670 | // | ||||
4671 | // This rule also existed in C89 and C99; the grammar for struct-declaration | ||||
4672 | // did not permit a struct-declaration without a struct-declarator-list. | ||||
4673 | if (!getLangOpts().CPlusPlus && CurContext->isRecord() && | ||||
4674 | DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { | ||||
4675 | // Check for Microsoft C extension: anonymous struct/union member. | ||||
4676 | // Handle 2 kinds of anonymous struct/union: | ||||
4677 | // struct STRUCT; | ||||
4678 | // union UNION; | ||||
4679 | // and | ||||
4680 | // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. | ||||
4681 | // UNION_TYPE; <- where UNION_TYPE is a typedef union. | ||||
4682 | if ((Tag && Tag->getDeclName()) || | ||||
4683 | DS.getTypeSpecType() == DeclSpec::TST_typename) { | ||||
4684 | RecordDecl *Record = nullptr; | ||||
4685 | if (Tag) | ||||
4686 | Record = dyn_cast<RecordDecl>(Tag); | ||||
4687 | else if (const RecordType *RT = | ||||
4688 | DS.getRepAsType().get()->getAsStructureType()) | ||||
4689 | Record = RT->getDecl(); | ||||
4690 | else if (const RecordType *UT = DS.getRepAsType().get()->getAsUnionType()) | ||||
4691 | Record = UT->getDecl(); | ||||
4692 | |||||
4693 | if (Record && getLangOpts().MicrosoftExt) { | ||||
4694 | Diag(DS.getBeginLoc(), diag::ext_ms_anonymous_record) | ||||
4695 | << Record->isUnion() << DS.getSourceRange(); | ||||
4696 | return BuildMicrosoftCAnonymousStruct(S, DS, Record); | ||||
4697 | } | ||||
4698 | |||||
4699 | DeclaresAnything = false; | ||||
4700 | } | ||||
4701 | } | ||||
4702 | |||||
4703 | // Skip all the checks below if we have a type error. | ||||
4704 | if (DS.getTypeSpecType() == DeclSpec::TST_error || | ||||
4705 | (TagD && TagD->isInvalidDecl())) | ||||
4706 | return TagD; | ||||
4707 | |||||
4708 | if (getLangOpts().CPlusPlus && | ||||
4709 | DS.getStorageClassSpec() != DeclSpec::SCS_typedef) | ||||
4710 | if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) | ||||
4711 | if (Enum->enumerator_begin() == Enum->enumerator_end() && | ||||
4712 | !Enum->getIdentifier() && !Enum->isInvalidDecl()) | ||||
4713 | DeclaresAnything = false; | ||||
4714 | |||||
4715 | if (!DS.isMissingDeclaratorOk()) { | ||||
4716 | // Customize diagnostic for a typedef missing a name. | ||||
4717 | if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) | ||||
4718 | Diag(DS.getBeginLoc(), diag::ext_typedef_without_a_name) | ||||
4719 | << DS.getSourceRange(); | ||||
4720 | else | ||||
4721 | DeclaresAnything = false; | ||||
4722 | } | ||||
4723 | |||||
4724 | if (DS.isModulePrivateSpecified() && | ||||
4725 | Tag && Tag->getDeclContext()->isFunctionOrMethod()) | ||||
4726 | Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) | ||||
4727 | << Tag->getTagKind() | ||||
4728 | << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); | ||||
4729 | |||||
4730 | ActOnDocumentableDecl(TagD); | ||||
4731 | |||||
4732 | // C 6.7/2: | ||||
4733 | // A declaration [...] shall declare at least a declarator [...], a tag, | ||||
4734 | // or the members of an enumeration. | ||||
4735 | // C++ [dcl.dcl]p3: | ||||
4736 | // [If there are no declarators], and except for the declaration of an | ||||
4737 | // unnamed bit-field, the decl-specifier-seq shall introduce one or more | ||||
4738 | // names into the program, or shall redeclare a name introduced by a | ||||
4739 | // previous declaration. | ||||
4740 | if (!DeclaresAnything) { | ||||
4741 | // In C, we allow this as a (popular) extension / bug. Don't bother | ||||
4742 | // producing further diagnostics for redundant qualifiers after this. | ||||
4743 | Diag(DS.getBeginLoc(), (IsExplicitInstantiation || !TemplateParams.empty()) | ||||
4744 | ? diag::err_no_declarators | ||||
4745 | : diag::ext_no_declarators) | ||||
4746 | << DS.getSourceRange(); | ||||
4747 | return TagD; | ||||
4748 | } | ||||
4749 | |||||
4750 | // C++ [dcl.stc]p1: | ||||
4751 | // If a storage-class-specifier appears in a decl-specifier-seq, [...] the | ||||
4752 | // init-declarator-list of the declaration shall not be empty. | ||||
4753 | // C++ [dcl.fct.spec]p1: | ||||
4754 | // If a cv-qualifier appears in a decl-specifier-seq, the | ||||
4755 | // init-declarator-list of the declaration shall not be empty. | ||||
4756 | // | ||||
4757 | // Spurious qualifiers here appear to be valid in C. | ||||
4758 | unsigned DiagID = diag::warn_standalone_specifier; | ||||
4759 | if (getLangOpts().CPlusPlus) | ||||
4760 | DiagID = diag::ext_standalone_specifier; | ||||
4761 | |||||
4762 | // Note that a linkage-specification sets a storage class, but | ||||
4763 | // 'extern "C" struct foo;' is actually valid and not theoretically | ||||
4764 | // useless. | ||||
4765 | if (DeclSpec::SCS SCS = DS.getStorageClassSpec()) { | ||||
4766 | if (SCS == DeclSpec::SCS_mutable) | ||||
4767 | // Since mutable is not a viable storage class specifier in C, there is | ||||
4768 | // no reason to treat it as an extension. Instead, diagnose as an error. | ||||
4769 | Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_nonmember); | ||||
4770 | else if (!DS.isExternInLinkageSpec() && SCS != DeclSpec::SCS_typedef) | ||||
4771 | Diag(DS.getStorageClassSpecLoc(), DiagID) | ||||
4772 | << DeclSpec::getSpecifierName(SCS); | ||||
4773 | } | ||||
4774 | |||||
4775 | if (DeclSpec::TSCS TSCS = DS.getThreadStorageClassSpec()) | ||||
4776 | Diag(DS.getThreadStorageClassSpecLoc(), DiagID) | ||||
4777 | << DeclSpec::getSpecifierName(TSCS); | ||||
4778 | if (DS.getTypeQualifiers()) { | ||||
4779 | if (DS.getTypeQualifiers() & DeclSpec::TQ_const) | ||||
4780 | Diag(DS.getConstSpecLoc(), DiagID) << "const"; | ||||
4781 | if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) | ||||
4782 | Diag(DS.getConstSpecLoc(), DiagID) << "volatile"; | ||||
4783 | // Restrict is covered above. | ||||
4784 | if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic) | ||||
4785 | Diag(DS.getAtomicSpecLoc(), DiagID) << "_Atomic"; | ||||
4786 | if (DS.getTypeQualifiers() & DeclSpec::TQ_unaligned) | ||||
4787 | Diag(DS.getUnalignedSpecLoc(), DiagID) << "__unaligned"; | ||||
4788 | } | ||||
4789 | |||||
4790 | // Warn about ignored type attributes, for example: | ||||
4791 | // __attribute__((aligned)) struct A; | ||||
4792 | // Attributes should be placed after tag to apply to type declaration. | ||||
4793 | if (!DS.getAttributes().empty()) { | ||||
4794 | DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); | ||||
4795 | if (TypeSpecType == DeclSpec::TST_class || | ||||
4796 | TypeSpecType == DeclSpec::TST_struct || | ||||
4797 | TypeSpecType == DeclSpec::TST_interface || | ||||
4798 | TypeSpecType == DeclSpec::TST_union || | ||||
4799 | TypeSpecType == DeclSpec::TST_enum) { | ||||
4800 | for (const ParsedAttr &AL : DS.getAttributes()) | ||||
4801 | Diag(AL.getLoc(), diag::warn_declspec_attribute_ignored) | ||||
4802 | << AL << GetDiagnosticTypeSpecifierID(TypeSpecType); | ||||
4803 | } | ||||
4804 | } | ||||
4805 | |||||
4806 | return TagD; | ||||
4807 | } | ||||
4808 | |||||
4809 | /// We are trying to inject an anonymous member into the given scope; | ||||
4810 | /// check if there's an existing declaration that can't be overloaded. | ||||
4811 | /// | ||||
4812 | /// \return true if this is a forbidden redeclaration | ||||
4813 | static bool CheckAnonMemberRedeclaration(Sema &SemaRef, | ||||
4814 | Scope *S, | ||||
4815 | DeclContext *Owner, | ||||
4816 | DeclarationName Name, | ||||
4817 | SourceLocation NameLoc, | ||||
4818 | bool IsUnion) { | ||||
4819 | LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, | ||||
4820 | Sema::ForVisibleRedeclaration); | ||||
4821 | if (!SemaRef.LookupName(R, S)) return false; | ||||
4822 | |||||
4823 | // Pick a representative declaration. | ||||
4824 | NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); | ||||
4825 | assert(PrevDecl && "Expected a non-null Decl")((PrevDecl && "Expected a non-null Decl") ? static_cast <void> (0) : __assert_fail ("PrevDecl && \"Expected a non-null Decl\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 4825, __PRETTY_FUNCTION__)); | ||||
4826 | |||||
4827 | if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) | ||||
4828 | return false; | ||||
4829 | |||||
4830 | SemaRef.Diag(NameLoc, diag::err_anonymous_record_member_redecl) | ||||
4831 | << IsUnion << Name; | ||||
4832 | SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); | ||||
4833 | |||||
4834 | return true; | ||||
4835 | } | ||||
4836 | |||||
4837 | /// InjectAnonymousStructOrUnionMembers - Inject the members of the | ||||
4838 | /// anonymous struct or union AnonRecord into the owning context Owner | ||||
4839 | /// and scope S. This routine will be invoked just after we realize | ||||
4840 | /// that an unnamed union or struct is actually an anonymous union or | ||||
4841 | /// struct, e.g., | ||||
4842 | /// | ||||
4843 | /// @code | ||||
4844 | /// union { | ||||
4845 | /// int i; | ||||
4846 | /// float f; | ||||
4847 | /// }; // InjectAnonymousStructOrUnionMembers called here to inject i and | ||||
4848 | /// // f into the surrounding scope.x | ||||
4849 | /// @endcode | ||||
4850 | /// | ||||
4851 | /// This routine is recursive, injecting the names of nested anonymous | ||||
4852 | /// structs/unions into the owning context and scope as well. | ||||
4853 | static bool | ||||
4854 | InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, DeclContext *Owner, | ||||
4855 | RecordDecl *AnonRecord, AccessSpecifier AS, | ||||
4856 | SmallVectorImpl<NamedDecl *> &Chaining) { | ||||
4857 | bool Invalid = false; | ||||
4858 | |||||
4859 | // Look every FieldDecl and IndirectFieldDecl with a name. | ||||
4860 | for (auto *D : AnonRecord->decls()) { | ||||
4861 | if ((isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D)) && | ||||
4862 | cast<NamedDecl>(D)->getDeclName()) { | ||||
4863 | ValueDecl *VD = cast<ValueDecl>(D); | ||||
4864 | if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), | ||||
4865 | VD->getLocation(), | ||||
4866 | AnonRecord->isUnion())) { | ||||
4867 | // C++ [class.union]p2: | ||||
4868 | // The names of the members of an anonymous union shall be | ||||
4869 | // distinct from the names of any other entity in the | ||||
4870 | // scope in which the anonymous union is declared. | ||||
4871 | Invalid = true; | ||||
4872 | } else { | ||||
4873 | // C++ [class.union]p2: | ||||
4874 | // For the purpose of name lookup, after the anonymous union | ||||
4875 | // definition, the members of the anonymous union are | ||||
4876 | // considered to have been defined in the scope in which the | ||||
4877 | // anonymous union is declared. | ||||
4878 | unsigned OldChainingSize = Chaining.size(); | ||||
4879 | if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) | ||||
4880 | Chaining.append(IF->chain_begin(), IF->chain_end()); | ||||
4881 | else | ||||
4882 | Chaining.push_back(VD); | ||||
4883 | |||||
4884 | assert(Chaining.size() >= 2)((Chaining.size() >= 2) ? static_cast<void> (0) : __assert_fail ("Chaining.size() >= 2", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 4884, __PRETTY_FUNCTION__)); | ||||
4885 | NamedDecl **NamedChain = | ||||
4886 | new (SemaRef.Context)NamedDecl*[Chaining.size()]; | ||||
4887 | for (unsigned i = 0; i < Chaining.size(); i++) | ||||
4888 | NamedChain[i] = Chaining[i]; | ||||
4889 | |||||
4890 | IndirectFieldDecl *IndirectField = IndirectFieldDecl::Create( | ||||
4891 | SemaRef.Context, Owner, VD->getLocation(), VD->getIdentifier(), | ||||
4892 | VD->getType(), {NamedChain, Chaining.size()}); | ||||
4893 | |||||
4894 | for (const auto *Attr : VD->attrs()) | ||||
4895 | IndirectField->addAttr(Attr->clone(SemaRef.Context)); | ||||
4896 | |||||
4897 | IndirectField->setAccess(AS); | ||||
4898 | IndirectField->setImplicit(); | ||||
4899 | SemaRef.PushOnScopeChains(IndirectField, S); | ||||
4900 | |||||
4901 | // That includes picking up the appropriate access specifier. | ||||
4902 | if (AS != AS_none) IndirectField->setAccess(AS); | ||||
4903 | |||||
4904 | Chaining.resize(OldChainingSize); | ||||
4905 | } | ||||
4906 | } | ||||
4907 | } | ||||
4908 | |||||
4909 | return Invalid; | ||||
4910 | } | ||||
4911 | |||||
4912 | /// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to | ||||
4913 | /// a VarDecl::StorageClass. Any error reporting is up to the caller: | ||||
4914 | /// illegal input values are mapped to SC_None. | ||||
4915 | static StorageClass | ||||
4916 | StorageClassSpecToVarDeclStorageClass(const DeclSpec &DS) { | ||||
4917 | DeclSpec::SCS StorageClassSpec = DS.getStorageClassSpec(); | ||||
4918 | assert(StorageClassSpec != DeclSpec::SCS_typedef &&((StorageClassSpec != DeclSpec::SCS_typedef && "Parser allowed 'typedef' as storage class VarDecl." ) ? static_cast<void> (0) : __assert_fail ("StorageClassSpec != DeclSpec::SCS_typedef && \"Parser allowed 'typedef' as storage class VarDecl.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 4919, __PRETTY_FUNCTION__)) | ||||
4919 | "Parser allowed 'typedef' as storage class VarDecl.")((StorageClassSpec != DeclSpec::SCS_typedef && "Parser allowed 'typedef' as storage class VarDecl." ) ? static_cast<void> (0) : __assert_fail ("StorageClassSpec != DeclSpec::SCS_typedef && \"Parser allowed 'typedef' as storage class VarDecl.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 4919, __PRETTY_FUNCTION__)); | ||||
4920 | switch (StorageClassSpec) { | ||||
4921 | case DeclSpec::SCS_unspecified: return SC_None; | ||||
4922 | case DeclSpec::SCS_extern: | ||||
4923 | if (DS.isExternInLinkageSpec()) | ||||
4924 | return SC_None; | ||||
4925 | return SC_Extern; | ||||
4926 | case DeclSpec::SCS_static: return SC_Static; | ||||
4927 | case DeclSpec::SCS_auto: return SC_Auto; | ||||
4928 | case DeclSpec::SCS_register: return SC_Register; | ||||
4929 | case DeclSpec::SCS_private_extern: return SC_PrivateExtern; | ||||
4930 | // Illegal SCSs map to None: error reporting is up to the caller. | ||||
4931 | case DeclSpec::SCS_mutable: // Fall through. | ||||
4932 | case DeclSpec::SCS_typedef: return SC_None; | ||||
4933 | } | ||||
4934 | llvm_unreachable("unknown storage class specifier")::llvm::llvm_unreachable_internal("unknown storage class specifier" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 4934); | ||||
4935 | } | ||||
4936 | |||||
4937 | static SourceLocation findDefaultInitializer(const CXXRecordDecl *Record) { | ||||
4938 | assert(Record->hasInClassInitializer())((Record->hasInClassInitializer()) ? static_cast<void> (0) : __assert_fail ("Record->hasInClassInitializer()", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 4938, __PRETTY_FUNCTION__)); | ||||
4939 | |||||
4940 | for (const auto *I : Record->decls()) { | ||||
4941 | const auto *FD = dyn_cast<FieldDecl>(I); | ||||
4942 | if (const auto *IFD = dyn_cast<IndirectFieldDecl>(I)) | ||||
4943 | FD = IFD->getAnonField(); | ||||
4944 | if (FD && FD->hasInClassInitializer()) | ||||
4945 | return FD->getLocation(); | ||||
4946 | } | ||||
4947 | |||||
4948 | llvm_unreachable("couldn't find in-class initializer")::llvm::llvm_unreachable_internal("couldn't find in-class initializer" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 4948); | ||||
4949 | } | ||||
4950 | |||||
4951 | static void checkDuplicateDefaultInit(Sema &S, CXXRecordDecl *Parent, | ||||
4952 | SourceLocation DefaultInitLoc) { | ||||
4953 | if (!Parent->isUnion() || !Parent->hasInClassInitializer()) | ||||
4954 | return; | ||||
4955 | |||||
4956 | S.Diag(DefaultInitLoc, diag::err_multiple_mem_union_initialization); | ||||
4957 | S.Diag(findDefaultInitializer(Parent), diag::note_previous_initializer) << 0; | ||||
4958 | } | ||||
4959 | |||||
4960 | static void checkDuplicateDefaultInit(Sema &S, CXXRecordDecl *Parent, | ||||
4961 | CXXRecordDecl *AnonUnion) { | ||||
4962 | if (!Parent->isUnion() || !Parent->hasInClassInitializer()) | ||||
4963 | return; | ||||
4964 | |||||
4965 | checkDuplicateDefaultInit(S, Parent, findDefaultInitializer(AnonUnion)); | ||||
4966 | } | ||||
4967 | |||||
4968 | /// BuildAnonymousStructOrUnion - Handle the declaration of an | ||||
4969 | /// anonymous structure or union. Anonymous unions are a C++ feature | ||||
4970 | /// (C++ [class.union]) and a C11 feature; anonymous structures | ||||
4971 | /// are a C11 feature and GNU C++ extension. | ||||
4972 | Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, | ||||
4973 | AccessSpecifier AS, | ||||
4974 | RecordDecl *Record, | ||||
4975 | const PrintingPolicy &Policy) { | ||||
4976 | DeclContext *Owner = Record->getDeclContext(); | ||||
4977 | |||||
4978 | // Diagnose whether this anonymous struct/union is an extension. | ||||
4979 | if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11) | ||||
4980 | Diag(Record->getLocation(), diag::ext_anonymous_union); | ||||
4981 | else if (!Record->isUnion() && getLangOpts().CPlusPlus) | ||||
4982 | Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); | ||||
4983 | else if (!Record->isUnion() && !getLangOpts().C11) | ||||
4984 | Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); | ||||
4985 | |||||
4986 | // C and C++ require different kinds of checks for anonymous | ||||
4987 | // structs/unions. | ||||
4988 | bool Invalid = false; | ||||
4989 | if (getLangOpts().CPlusPlus) { | ||||
4990 | const char *PrevSpec = nullptr; | ||||
4991 | if (Record->isUnion()) { | ||||
4992 | // C++ [class.union]p6: | ||||
4993 | // C++17 [class.union.anon]p2: | ||||
4994 | // Anonymous unions declared in a named namespace or in the | ||||
4995 | // global namespace shall be declared static. | ||||
4996 | unsigned DiagID; | ||||
4997 | DeclContext *OwnerScope = Owner->getRedeclContext(); | ||||
4998 | if (DS.getStorageClassSpec() != DeclSpec::SCS_static && | ||||
4999 | (OwnerScope->isTranslationUnit() || | ||||
5000 | (OwnerScope->isNamespace() && | ||||
5001 | !cast<NamespaceDecl>(OwnerScope)->isAnonymousNamespace()))) { | ||||
5002 | Diag(Record->getLocation(), diag::err_anonymous_union_not_static) | ||||
5003 | << FixItHint::CreateInsertion(Record->getLocation(), "static "); | ||||
5004 | |||||
5005 | // Recover by adding 'static'. | ||||
5006 | DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), | ||||
5007 | PrevSpec, DiagID, Policy); | ||||
5008 | } | ||||
5009 | // C++ [class.union]p6: | ||||
5010 | // A storage class is not allowed in a declaration of an | ||||
5011 | // anonymous union in a class scope. | ||||
5012 | else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && | ||||
5013 | isa<RecordDecl>(Owner)) { | ||||
5014 | Diag(DS.getStorageClassSpecLoc(), | ||||
5015 | diag::err_anonymous_union_with_storage_spec) | ||||
5016 | << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); | ||||
5017 | |||||
5018 | // Recover by removing the storage specifier. | ||||
5019 | DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, | ||||
5020 | SourceLocation(), | ||||
5021 | PrevSpec, DiagID, Context.getPrintingPolicy()); | ||||
5022 | } | ||||
5023 | } | ||||
5024 | |||||
5025 | // Ignore const/volatile/restrict qualifiers. | ||||
5026 | if (DS.getTypeQualifiers()) { | ||||
5027 | if (DS.getTypeQualifiers() & DeclSpec::TQ_const) | ||||
5028 | Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) | ||||
5029 | << Record->isUnion() << "const" | ||||
5030 | << FixItHint::CreateRemoval(DS.getConstSpecLoc()); | ||||
5031 | if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) | ||||
5032 | Diag(DS.getVolatileSpecLoc(), | ||||
5033 | diag::ext_anonymous_struct_union_qualified) | ||||
5034 | << Record->isUnion() << "volatile" | ||||
5035 | << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); | ||||
5036 | if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) | ||||
5037 | Diag(DS.getRestrictSpecLoc(), | ||||
5038 | diag::ext_anonymous_struct_union_qualified) | ||||
5039 | << Record->isUnion() << "restrict" | ||||
5040 | << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); | ||||
5041 | if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic) | ||||
5042 | Diag(DS.getAtomicSpecLoc(), | ||||
5043 | diag::ext_anonymous_struct_union_qualified) | ||||
5044 | << Record->isUnion() << "_Atomic" | ||||
5045 | << FixItHint::CreateRemoval(DS.getAtomicSpecLoc()); | ||||
5046 | if (DS.getTypeQualifiers() & DeclSpec::TQ_unaligned) | ||||
5047 | Diag(DS.getUnalignedSpecLoc(), | ||||
5048 | diag::ext_anonymous_struct_union_qualified) | ||||
5049 | << Record->isUnion() << "__unaligned" | ||||
5050 | << FixItHint::CreateRemoval(DS.getUnalignedSpecLoc()); | ||||
5051 | |||||
5052 | DS.ClearTypeQualifiers(); | ||||
5053 | } | ||||
5054 | |||||
5055 | // C++ [class.union]p2: | ||||
5056 | // The member-specification of an anonymous union shall only | ||||
5057 | // define non-static data members. [Note: nested types and | ||||
5058 | // functions cannot be declared within an anonymous union. ] | ||||
5059 | for (auto *Mem : Record->decls()) { | ||||
5060 | // Ignore invalid declarations; we already diagnosed them. | ||||
5061 | if (Mem->isInvalidDecl()) | ||||
5062 | continue; | ||||
5063 | |||||
5064 | if (auto *FD = dyn_cast<FieldDecl>(Mem)) { | ||||
5065 | // C++ [class.union]p3: | ||||
5066 | // An anonymous union shall not have private or protected | ||||
5067 | // members (clause 11). | ||||
5068 | assert(FD->getAccess() != AS_none)((FD->getAccess() != AS_none) ? static_cast<void> (0 ) : __assert_fail ("FD->getAccess() != AS_none", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 5068, __PRETTY_FUNCTION__)); | ||||
5069 | if (FD->getAccess() != AS_public) { | ||||
5070 | Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) | ||||
5071 | << Record->isUnion() << (FD->getAccess() == AS_protected); | ||||
5072 | Invalid = true; | ||||
5073 | } | ||||
5074 | |||||
5075 | // C++ [class.union]p1 | ||||
5076 | // An object of a class with a non-trivial constructor, a non-trivial | ||||
5077 | // copy constructor, a non-trivial destructor, or a non-trivial copy | ||||
5078 | // assignment operator cannot be a member of a union, nor can an | ||||
5079 | // array of such objects. | ||||
5080 | if (CheckNontrivialField(FD)) | ||||
5081 | Invalid = true; | ||||
5082 | } else if (Mem->isImplicit()) { | ||||
5083 | // Any implicit members are fine. | ||||
5084 | } else if (isa<TagDecl>(Mem) && Mem->getDeclContext() != Record) { | ||||
5085 | // This is a type that showed up in an | ||||
5086 | // elaborated-type-specifier inside the anonymous struct or | ||||
5087 | // union, but which actually declares a type outside of the | ||||
5088 | // anonymous struct or union. It's okay. | ||||
5089 | } else if (auto *MemRecord = dyn_cast<RecordDecl>(Mem)) { | ||||
5090 | if (!MemRecord->isAnonymousStructOrUnion() && | ||||
5091 | MemRecord->getDeclName()) { | ||||
5092 | // Visual C++ allows type definition in anonymous struct or union. | ||||
5093 | if (getLangOpts().MicrosoftExt) | ||||
5094 | Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) | ||||
5095 | << Record->isUnion(); | ||||
5096 | else { | ||||
5097 | // This is a nested type declaration. | ||||
5098 | Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) | ||||
5099 | << Record->isUnion(); | ||||
5100 | Invalid = true; | ||||
5101 | } | ||||
5102 | } else { | ||||
5103 | // This is an anonymous type definition within another anonymous type. | ||||
5104 | // This is a popular extension, provided by Plan9, MSVC and GCC, but | ||||
5105 | // not part of standard C++. | ||||
5106 | Diag(MemRecord->getLocation(), | ||||
5107 | diag::ext_anonymous_record_with_anonymous_type) | ||||
5108 | << Record->isUnion(); | ||||
5109 | } | ||||
5110 | } else if (isa<AccessSpecDecl>(Mem)) { | ||||
5111 | // Any access specifier is fine. | ||||
5112 | } else if (isa<StaticAssertDecl>(Mem)) { | ||||
5113 | // In C++1z, static_assert declarations are also fine. | ||||
5114 | } else { | ||||
5115 | // We have something that isn't a non-static data | ||||
5116 | // member. Complain about it. | ||||
5117 | unsigned DK = diag::err_anonymous_record_bad_member; | ||||
5118 | if (isa<TypeDecl>(Mem)) | ||||
5119 | DK = diag::err_anonymous_record_with_type; | ||||
5120 | else if (isa<FunctionDecl>(Mem)) | ||||
5121 | DK = diag::err_anonymous_record_with_function; | ||||
5122 | else if (isa<VarDecl>(Mem)) | ||||
5123 | DK = diag::err_anonymous_record_with_static; | ||||
5124 | |||||
5125 | // Visual C++ allows type definition in anonymous struct or union. | ||||
5126 | if (getLangOpts().MicrosoftExt && | ||||
5127 | DK == diag::err_anonymous_record_with_type) | ||||
5128 | Diag(Mem->getLocation(), diag::ext_anonymous_record_with_type) | ||||
5129 | << Record->isUnion(); | ||||
5130 | else { | ||||
5131 | Diag(Mem->getLocation(), DK) << Record->isUnion(); | ||||
5132 | Invalid = true; | ||||
5133 | } | ||||
5134 | } | ||||
5135 | } | ||||
5136 | |||||
5137 | // C++11 [class.union]p8 (DR1460): | ||||
5138 | // At most one variant member of a union may have a | ||||
5139 | // brace-or-equal-initializer. | ||||
5140 | if (cast<CXXRecordDecl>(Record)->hasInClassInitializer() && | ||||
5141 | Owner->isRecord()) | ||||
5142 | checkDuplicateDefaultInit(*this, cast<CXXRecordDecl>(Owner), | ||||
5143 | cast<CXXRecordDecl>(Record)); | ||||
5144 | } | ||||
5145 | |||||
5146 | if (!Record->isUnion() && !Owner->isRecord()) { | ||||
5147 | Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) | ||||
5148 | << getLangOpts().CPlusPlus; | ||||
5149 | Invalid = true; | ||||
5150 | } | ||||
5151 | |||||
5152 | // C++ [dcl.dcl]p3: | ||||
5153 | // [If there are no declarators], and except for the declaration of an | ||||
5154 | // unnamed bit-field, the decl-specifier-seq shall introduce one or more | ||||
5155 | // names into the program | ||||
5156 | // C++ [class.mem]p2: | ||||
5157 | // each such member-declaration shall either declare at least one member | ||||
5158 | // name of the class or declare at least one unnamed bit-field | ||||
5159 | // | ||||
5160 | // For C this is an error even for a named struct, and is diagnosed elsewhere. | ||||
5161 | if (getLangOpts().CPlusPlus && Record->field_empty()) | ||||
5162 | Diag(DS.getBeginLoc(), diag::ext_no_declarators) << DS.getSourceRange(); | ||||
5163 | |||||
5164 | // Mock up a declarator. | ||||
5165 | Declarator Dc(DS, DeclaratorContext::Member); | ||||
5166 | TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); | ||||
5167 | assert(TInfo && "couldn't build declarator info for anonymous struct/union")((TInfo && "couldn't build declarator info for anonymous struct/union" ) ? static_cast<void> (0) : __assert_fail ("TInfo && \"couldn't build declarator info for anonymous struct/union\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 5167, __PRETTY_FUNCTION__)); | ||||
5168 | |||||
5169 | // Create a declaration for this anonymous struct/union. | ||||
5170 | NamedDecl *Anon = nullptr; | ||||
5171 | if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { | ||||
5172 | Anon = FieldDecl::Create( | ||||
5173 | Context, OwningClass, DS.getBeginLoc(), Record->getLocation(), | ||||
5174 | /*IdentifierInfo=*/nullptr, Context.getTypeDeclType(Record), TInfo, | ||||
5175 | /*BitWidth=*/nullptr, /*Mutable=*/false, | ||||
5176 | /*InitStyle=*/ICIS_NoInit); | ||||
5177 | Anon->setAccess(AS); | ||||
5178 | ProcessDeclAttributes(S, Anon, Dc); | ||||
5179 | |||||
5180 | if (getLangOpts().CPlusPlus) | ||||
5181 | FieldCollector->Add(cast<FieldDecl>(Anon)); | ||||
5182 | } else { | ||||
5183 | DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); | ||||
5184 | StorageClass SC = StorageClassSpecToVarDeclStorageClass(DS); | ||||
5185 | if (SCSpec == DeclSpec::SCS_mutable) { | ||||
5186 | // mutable can only appear on non-static class members, so it's always | ||||
5187 | // an error here | ||||
5188 | Diag(Record->getLocation(), diag::err_mutable_nonmember); | ||||
5189 | Invalid = true; | ||||
5190 | SC = SC_None; | ||||
5191 | } | ||||
5192 | |||||
5193 | assert(DS.getAttributes().empty() && "No attribute expected")((DS.getAttributes().empty() && "No attribute expected" ) ? static_cast<void> (0) : __assert_fail ("DS.getAttributes().empty() && \"No attribute expected\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 5193, __PRETTY_FUNCTION__)); | ||||
5194 | Anon = VarDecl::Create(Context, Owner, DS.getBeginLoc(), | ||||
5195 | Record->getLocation(), /*IdentifierInfo=*/nullptr, | ||||
5196 | Context.getTypeDeclType(Record), TInfo, SC); | ||||
5197 | |||||
5198 | // Default-initialize the implicit variable. This initialization will be | ||||
5199 | // trivial in almost all cases, except if a union member has an in-class | ||||
5200 | // initializer: | ||||
5201 | // union { int n = 0; }; | ||||
5202 | ActOnUninitializedDecl(Anon); | ||||
5203 | } | ||||
5204 | Anon->setImplicit(); | ||||
5205 | |||||
5206 | // Mark this as an anonymous struct/union type. | ||||
5207 | Record->setAnonymousStructOrUnion(true); | ||||
5208 | |||||
5209 | // Add the anonymous struct/union object to the current | ||||
5210 | // context. We'll be referencing this object when we refer to one of | ||||
5211 | // its members. | ||||
5212 | Owner->addDecl(Anon); | ||||
5213 | |||||
5214 | // Inject the members of the anonymous struct/union into the owning | ||||
5215 | // context and into the identifier resolver chain for name lookup | ||||
5216 | // purposes. | ||||
5217 | SmallVector<NamedDecl*, 2> Chain; | ||||
5218 | Chain.push_back(Anon); | ||||
5219 | |||||
5220 | if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, Chain)) | ||||
5221 | Invalid = true; | ||||
5222 | |||||
5223 | if (VarDecl *NewVD = dyn_cast<VarDecl>(Anon)) { | ||||
5224 | if (getLangOpts().CPlusPlus && NewVD->isStaticLocal()) { | ||||
5225 | MangleNumberingContext *MCtx; | ||||
5226 | Decl *ManglingContextDecl; | ||||
5227 | std::tie(MCtx, ManglingContextDecl) = | ||||
5228 | getCurrentMangleNumberContext(NewVD->getDeclContext()); | ||||
5229 | if (MCtx) { | ||||
5230 | Context.setManglingNumber( | ||||
5231 | NewVD, MCtx->getManglingNumber( | ||||
5232 | NewVD, getMSManglingNumber(getLangOpts(), S))); | ||||
5233 | Context.setStaticLocalNumber(NewVD, MCtx->getStaticLocalNumber(NewVD)); | ||||
5234 | } | ||||
5235 | } | ||||
5236 | } | ||||
5237 | |||||
5238 | if (Invalid) | ||||
5239 | Anon->setInvalidDecl(); | ||||
5240 | |||||
5241 | return Anon; | ||||
5242 | } | ||||
5243 | |||||
5244 | /// BuildMicrosoftCAnonymousStruct - Handle the declaration of an | ||||
5245 | /// Microsoft C anonymous structure. | ||||
5246 | /// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx | ||||
5247 | /// Example: | ||||
5248 | /// | ||||
5249 | /// struct A { int a; }; | ||||
5250 | /// struct B { struct A; int b; }; | ||||
5251 | /// | ||||
5252 | /// void foo() { | ||||
5253 | /// B var; | ||||
5254 | /// var.a = 3; | ||||
5255 | /// } | ||||
5256 | /// | ||||
5257 | Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, | ||||
5258 | RecordDecl *Record) { | ||||
5259 | assert(Record && "expected a record!")((Record && "expected a record!") ? static_cast<void > (0) : __assert_fail ("Record && \"expected a record!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 5259, __PRETTY_FUNCTION__)); | ||||
5260 | |||||
5261 | // Mock up a declarator. | ||||
5262 | Declarator Dc(DS, DeclaratorContext::TypeName); | ||||
5263 | TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); | ||||
5264 | assert(TInfo && "couldn't build declarator info for anonymous struct")((TInfo && "couldn't build declarator info for anonymous struct" ) ? static_cast<void> (0) : __assert_fail ("TInfo && \"couldn't build declarator info for anonymous struct\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 5264, __PRETTY_FUNCTION__)); | ||||
5265 | |||||
5266 | auto *ParentDecl = cast<RecordDecl>(CurContext); | ||||
5267 | QualType RecTy = Context.getTypeDeclType(Record); | ||||
5268 | |||||
5269 | // Create a declaration for this anonymous struct. | ||||
5270 | NamedDecl *Anon = | ||||
5271 | FieldDecl::Create(Context, ParentDecl, DS.getBeginLoc(), DS.getBeginLoc(), | ||||
5272 | /*IdentifierInfo=*/nullptr, RecTy, TInfo, | ||||
5273 | /*BitWidth=*/nullptr, /*Mutable=*/false, | ||||
5274 | /*InitStyle=*/ICIS_NoInit); | ||||
5275 | Anon->setImplicit(); | ||||
5276 | |||||
5277 | // Add the anonymous struct object to the current context. | ||||
5278 | CurContext->addDecl(Anon); | ||||
5279 | |||||
5280 | // Inject the members of the anonymous struct into the current | ||||
5281 | // context and into the identifier resolver chain for name lookup | ||||
5282 | // purposes. | ||||
5283 | SmallVector<NamedDecl*, 2> Chain; | ||||
5284 | Chain.push_back(Anon); | ||||
5285 | |||||
5286 | RecordDecl *RecordDef = Record->getDefinition(); | ||||
5287 | if (RequireCompleteSizedType(Anon->getLocation(), RecTy, | ||||
5288 | diag::err_field_incomplete_or_sizeless) || | ||||
5289 | InjectAnonymousStructOrUnionMembers(*this, S, CurContext, RecordDef, | ||||
5290 | AS_none, Chain)) { | ||||
5291 | Anon->setInvalidDecl(); | ||||
5292 | ParentDecl->setInvalidDecl(); | ||||
5293 | } | ||||
5294 | |||||
5295 | return Anon; | ||||
5296 | } | ||||
5297 | |||||
5298 | /// GetNameForDeclarator - Determine the full declaration name for the | ||||
5299 | /// given Declarator. | ||||
5300 | DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { | ||||
5301 | return GetNameFromUnqualifiedId(D.getName()); | ||||
5302 | } | ||||
5303 | |||||
5304 | /// Retrieves the declaration name from a parsed unqualified-id. | ||||
5305 | DeclarationNameInfo | ||||
5306 | Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { | ||||
5307 | DeclarationNameInfo NameInfo; | ||||
5308 | NameInfo.setLoc(Name.StartLocation); | ||||
5309 | |||||
5310 | switch (Name.getKind()) { | ||||
5311 | |||||
5312 | case UnqualifiedIdKind::IK_ImplicitSelfParam: | ||||
5313 | case UnqualifiedIdKind::IK_Identifier: | ||||
5314 | NameInfo.setName(Name.Identifier); | ||||
5315 | return NameInfo; | ||||
5316 | |||||
5317 | case UnqualifiedIdKind::IK_DeductionGuideName: { | ||||
5318 | // C++ [temp.deduct.guide]p3: | ||||
5319 | // The simple-template-id shall name a class template specialization. | ||||
5320 | // The template-name shall be the same identifier as the template-name | ||||
5321 | // of the simple-template-id. | ||||
5322 | // These together intend to imply that the template-name shall name a | ||||
5323 | // class template. | ||||
5324 | // FIXME: template<typename T> struct X {}; | ||||
5325 | // template<typename T> using Y = X<T>; | ||||
5326 | // Y(int) -> Y<int>; | ||||
5327 | // satisfies these rules but does not name a class template. | ||||
5328 | TemplateName TN = Name.TemplateName.get().get(); | ||||
5329 | auto *Template = TN.getAsTemplateDecl(); | ||||
5330 | if (!Template || !isa<ClassTemplateDecl>(Template)) { | ||||
5331 | Diag(Name.StartLocation, | ||||
5332 | diag::err_deduction_guide_name_not_class_template) | ||||
5333 | << (int)getTemplateNameKindForDiagnostics(TN) << TN; | ||||
5334 | if (Template) | ||||
5335 | Diag(Template->getLocation(), diag::note_template_decl_here); | ||||
5336 | return DeclarationNameInfo(); | ||||
5337 | } | ||||
5338 | |||||
5339 | NameInfo.setName( | ||||
5340 | Context.DeclarationNames.getCXXDeductionGuideName(Template)); | ||||
5341 | return NameInfo; | ||||
5342 | } | ||||
5343 | |||||
5344 | case UnqualifiedIdKind::IK_OperatorFunctionId: | ||||
5345 | NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( | ||||
5346 | Name.OperatorFunctionId.Operator)); | ||||
5347 | NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc = | ||||
5348 | Name.OperatorFunctionId.SymbolLocations[0].getRawEncoding(); | ||||
5349 | NameInfo.getInfo().CXXOperatorName.EndOpNameLoc | ||||
5350 | = Name.EndLocation.getRawEncoding(); | ||||
5351 | return NameInfo; | ||||
5352 | |||||
5353 | case UnqualifiedIdKind::IK_LiteralOperatorId: | ||||
5354 | NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( | ||||
5355 | Name.Identifier)); | ||||
5356 | NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); | ||||
5357 | return NameInfo; | ||||
5358 | |||||
5359 | case UnqualifiedIdKind::IK_ConversionFunctionId: { | ||||
5360 | TypeSourceInfo *TInfo; | ||||
5361 | QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); | ||||
5362 | if (Ty.isNull()) | ||||
5363 | return DeclarationNameInfo(); | ||||
5364 | NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( | ||||
5365 | Context.getCanonicalType(Ty))); | ||||
5366 | NameInfo.setNamedTypeInfo(TInfo); | ||||
5367 | return NameInfo; | ||||
5368 | } | ||||
5369 | |||||
5370 | case UnqualifiedIdKind::IK_ConstructorName: { | ||||
5371 | TypeSourceInfo *TInfo; | ||||
5372 | QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); | ||||
5373 | if (Ty.isNull()) | ||||
5374 | return DeclarationNameInfo(); | ||||
5375 | NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( | ||||
5376 | Context.getCanonicalType(Ty))); | ||||
5377 | NameInfo.setNamedTypeInfo(TInfo); | ||||
5378 | return NameInfo; | ||||
5379 | } | ||||
5380 | |||||
5381 | case UnqualifiedIdKind::IK_ConstructorTemplateId: { | ||||
5382 | // In well-formed code, we can only have a constructor | ||||
5383 | // template-id that refers to the current context, so go there | ||||
5384 | // to find the actual type being constructed. | ||||
5385 | CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); | ||||
5386 | if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) | ||||
5387 | return DeclarationNameInfo(); | ||||
5388 | |||||
5389 | // Determine the type of the class being constructed. | ||||
5390 | QualType CurClassType = Context.getTypeDeclType(CurClass); | ||||
5391 | |||||
5392 | // FIXME: Check two things: that the template-id names the same type as | ||||
5393 | // CurClassType, and that the template-id does not occur when the name | ||||
5394 | // was qualified. | ||||
5395 | |||||
5396 | NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( | ||||
5397 | Context.getCanonicalType(CurClassType))); | ||||
5398 | // FIXME: should we retrieve TypeSourceInfo? | ||||
5399 | NameInfo.setNamedTypeInfo(nullptr); | ||||
5400 | return NameInfo; | ||||
5401 | } | ||||
5402 | |||||
5403 | case UnqualifiedIdKind::IK_DestructorName: { | ||||
5404 | TypeSourceInfo *TInfo; | ||||
5405 | QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); | ||||
5406 | if (Ty.isNull()) | ||||
5407 | return DeclarationNameInfo(); | ||||
5408 | NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( | ||||
5409 | Context.getCanonicalType(Ty))); | ||||
5410 | NameInfo.setNamedTypeInfo(TInfo); | ||||
5411 | return NameInfo; | ||||
5412 | } | ||||
5413 | |||||
5414 | case UnqualifiedIdKind::IK_TemplateId: { | ||||
5415 | TemplateName TName = Name.TemplateId->Template.get(); | ||||
5416 | SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; | ||||
5417 | return Context.getNameForTemplate(TName, TNameLoc); | ||||
5418 | } | ||||
5419 | |||||
5420 | } // switch (Name.getKind()) | ||||
5421 | |||||
5422 | llvm_unreachable("Unknown name kind")::llvm::llvm_unreachable_internal("Unknown name kind", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 5422); | ||||
5423 | } | ||||
5424 | |||||
5425 | static QualType getCoreType(QualType Ty) { | ||||
5426 | do { | ||||
5427 | if (Ty->isPointerType() || Ty->isReferenceType()) | ||||
5428 | Ty = Ty->getPointeeType(); | ||||
5429 | else if (Ty->isArrayType()) | ||||
5430 | Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); | ||||
5431 | else | ||||
5432 | return Ty.withoutLocalFastQualifiers(); | ||||
5433 | } while (true); | ||||
5434 | } | ||||
5435 | |||||
5436 | /// hasSimilarParameters - Determine whether the C++ functions Declaration | ||||
5437 | /// and Definition have "nearly" matching parameters. This heuristic is | ||||
5438 | /// used to improve diagnostics in the case where an out-of-line function | ||||
5439 | /// definition doesn't match any declaration within the class or namespace. | ||||
5440 | /// Also sets Params to the list of indices to the parameters that differ | ||||
5441 | /// between the declaration and the definition. If hasSimilarParameters | ||||
5442 | /// returns true and Params is empty, then all of the parameters match. | ||||
5443 | static bool hasSimilarParameters(ASTContext &Context, | ||||
5444 | FunctionDecl *Declaration, | ||||
5445 | FunctionDecl *Definition, | ||||
5446 | SmallVectorImpl<unsigned> &Params) { | ||||
5447 | Params.clear(); | ||||
5448 | if (Declaration->param_size() != Definition->param_size()) | ||||
5449 | return false; | ||||
5450 | for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { | ||||
5451 | QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); | ||||
5452 | QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); | ||||
5453 | |||||
5454 | // The parameter types are identical | ||||
5455 | if (Context.hasSameUnqualifiedType(DefParamTy, DeclParamTy)) | ||||
5456 | continue; | ||||
5457 | |||||
5458 | QualType DeclParamBaseTy = getCoreType(DeclParamTy); | ||||
5459 | QualType DefParamBaseTy = getCoreType(DefParamTy); | ||||
5460 | const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); | ||||
5461 | const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); | ||||
5462 | |||||
5463 | if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || | ||||
5464 | (DeclTyName && DeclTyName == DefTyName)) | ||||
5465 | Params.push_back(Idx); | ||||
5466 | else // The two parameters aren't even close | ||||
5467 | return false; | ||||
5468 | } | ||||
5469 | |||||
5470 | return true; | ||||
5471 | } | ||||
5472 | |||||
5473 | /// NeedsRebuildingInCurrentInstantiation - Checks whether the given | ||||
5474 | /// declarator needs to be rebuilt in the current instantiation. | ||||
5475 | /// Any bits of declarator which appear before the name are valid for | ||||
5476 | /// consideration here. That's specifically the type in the decl spec | ||||
5477 | /// and the base type in any member-pointer chunks. | ||||
5478 | static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, | ||||
5479 | DeclarationName Name) { | ||||
5480 | // The types we specifically need to rebuild are: | ||||
5481 | // - typenames, typeofs, and decltypes | ||||
5482 | // - types which will become injected class names | ||||
5483 | // Of course, we also need to rebuild any type referencing such a | ||||
5484 | // type. It's safest to just say "dependent", but we call out a | ||||
5485 | // few cases here. | ||||
5486 | |||||
5487 | DeclSpec &DS = D.getMutableDeclSpec(); | ||||
5488 | switch (DS.getTypeSpecType()) { | ||||
5489 | case DeclSpec::TST_typename: | ||||
5490 | case DeclSpec::TST_typeofType: | ||||
5491 | case DeclSpec::TST_underlyingType: | ||||
5492 | case DeclSpec::TST_atomic: { | ||||
5493 | // Grab the type from the parser. | ||||
5494 | TypeSourceInfo *TSI = nullptr; | ||||
5495 | QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); | ||||
5496 | if (T.isNull() || !T->isInstantiationDependentType()) break; | ||||
5497 | |||||
5498 | // Make sure there's a type source info. This isn't really much | ||||
5499 | // of a waste; most dependent types should have type source info | ||||
5500 | // attached already. | ||||
5501 | if (!TSI) | ||||
5502 | TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); | ||||
5503 | |||||
5504 | // Rebuild the type in the current instantiation. | ||||
5505 | TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); | ||||
5506 | if (!TSI) return true; | ||||
5507 | |||||
5508 | // Store the new type back in the decl spec. | ||||
5509 | ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); | ||||
5510 | DS.UpdateTypeRep(LocType); | ||||
5511 | break; | ||||
5512 | } | ||||
5513 | |||||
5514 | case DeclSpec::TST_decltype: | ||||
5515 | case DeclSpec::TST_typeofExpr: { | ||||
5516 | Expr *E = DS.getRepAsExpr(); | ||||
5517 | ExprResult Result = S.RebuildExprInCurrentInstantiation(E); | ||||
5518 | if (Result.isInvalid()) return true; | ||||
5519 | DS.UpdateExprRep(Result.get()); | ||||
5520 | break; | ||||
5521 | } | ||||
5522 | |||||
5523 | default: | ||||
5524 | // Nothing to do for these decl specs. | ||||
5525 | break; | ||||
5526 | } | ||||
5527 | |||||
5528 | // It doesn't matter what order we do this in. | ||||
5529 | for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { | ||||
5530 | DeclaratorChunk &Chunk = D.getTypeObject(I); | ||||
5531 | |||||
5532 | // The only type information in the declarator which can come | ||||
5533 | // before the declaration name is the base type of a member | ||||
5534 | // pointer. | ||||
5535 | if (Chunk.Kind != DeclaratorChunk::MemberPointer) | ||||
5536 | continue; | ||||
5537 | |||||
5538 | // Rebuild the scope specifier in-place. | ||||
5539 | CXXScopeSpec &SS = Chunk.Mem.Scope(); | ||||
5540 | if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) | ||||
5541 | return true; | ||||
5542 | } | ||||
5543 | |||||
5544 | return false; | ||||
5545 | } | ||||
5546 | |||||
5547 | Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { | ||||
5548 | D.setFunctionDefinitionKind(FunctionDefinitionKind::Declaration); | ||||
5549 | Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg()); | ||||
5550 | |||||
5551 | if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && | ||||
5552 | Dcl && Dcl->getDeclContext()->isFileContext()) | ||||
5553 | Dcl->setTopLevelDeclInObjCContainer(); | ||||
5554 | |||||
5555 | if (getLangOpts().OpenCL) | ||||
5556 | setCurrentOpenCLExtensionForDecl(Dcl); | ||||
5557 | |||||
5558 | return Dcl; | ||||
5559 | } | ||||
5560 | |||||
5561 | /// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: | ||||
5562 | /// If T is the name of a class, then each of the following shall have a | ||||
5563 | /// name different from T: | ||||
5564 | /// - every static data member of class T; | ||||
5565 | /// - every member function of class T | ||||
5566 | /// - every member of class T that is itself a type; | ||||
5567 | /// \returns true if the declaration name violates these rules. | ||||
5568 | bool Sema::DiagnoseClassNameShadow(DeclContext *DC, | ||||
5569 | DeclarationNameInfo NameInfo) { | ||||
5570 | DeclarationName Name = NameInfo.getName(); | ||||
5571 | |||||
5572 | CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC); | ||||
5573 | while (Record && Record->isAnonymousStructOrUnion()) | ||||
5574 | Record = dyn_cast<CXXRecordDecl>(Record->getParent()); | ||||
5575 | if (Record && Record->getIdentifier() && Record->getDeclName() == Name) { | ||||
5576 | Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; | ||||
5577 | return true; | ||||
5578 | } | ||||
5579 | |||||
5580 | return false; | ||||
5581 | } | ||||
5582 | |||||
5583 | /// Diagnose a declaration whose declarator-id has the given | ||||
5584 | /// nested-name-specifier. | ||||
5585 | /// | ||||
5586 | /// \param SS The nested-name-specifier of the declarator-id. | ||||
5587 | /// | ||||
5588 | /// \param DC The declaration context to which the nested-name-specifier | ||||
5589 | /// resolves. | ||||
5590 | /// | ||||
5591 | /// \param Name The name of the entity being declared. | ||||
5592 | /// | ||||
5593 | /// \param Loc The location of the name of the entity being declared. | ||||
5594 | /// | ||||
5595 | /// \param IsTemplateId Whether the name is a (simple-)template-id, and thus | ||||
5596 | /// we're declaring an explicit / partial specialization / instantiation. | ||||
5597 | /// | ||||
5598 | /// \returns true if we cannot safely recover from this error, false otherwise. | ||||
5599 | bool Sema::diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC, | ||||
5600 | DeclarationName Name, | ||||
5601 | SourceLocation Loc, bool IsTemplateId) { | ||||
5602 | DeclContext *Cur = CurContext; | ||||
5603 | while (isa<LinkageSpecDecl>(Cur) || isa<CapturedDecl>(Cur)) | ||||
5604 | Cur = Cur->getParent(); | ||||
5605 | |||||
5606 | // If the user provided a superfluous scope specifier that refers back to the | ||||
5607 | // class in which the entity is already declared, diagnose and ignore it. | ||||
5608 | // | ||||
5609 | // class X { | ||||
5610 | // void X::f(); | ||||
5611 | // }; | ||||
5612 | // | ||||
5613 | // Note, it was once ill-formed to give redundant qualification in all | ||||
5614 | // contexts, but that rule was removed by DR482. | ||||
5615 | if (Cur->Equals(DC)) { | ||||
5616 | if (Cur->isRecord()) { | ||||
5617 | Diag(Loc, LangOpts.MicrosoftExt ? diag::warn_member_extra_qualification | ||||
5618 | : diag::err_member_extra_qualification) | ||||
5619 | << Name << FixItHint::CreateRemoval(SS.getRange()); | ||||
5620 | SS.clear(); | ||||
5621 | } else { | ||||
5622 | Diag(Loc, diag::warn_namespace_member_extra_qualification) << Name; | ||||
5623 | } | ||||
5624 | return false; | ||||
5625 | } | ||||
5626 | |||||
5627 | // Check whether the qualifying scope encloses the scope of the original | ||||
5628 | // declaration. For a template-id, we perform the checks in | ||||
5629 | // CheckTemplateSpecializationScope. | ||||
5630 | if (!Cur->Encloses(DC) && !IsTemplateId) { | ||||
5631 | if (Cur->isRecord()) | ||||
5632 | Diag(Loc, diag::err_member_qualification) | ||||
5633 | << Name << SS.getRange(); | ||||
5634 | else if (isa<TranslationUnitDecl>(DC)) | ||||
5635 | Diag(Loc, diag::err_invalid_declarator_global_scope) | ||||
5636 | << Name << SS.getRange(); | ||||
5637 | else if (isa<FunctionDecl>(Cur)) | ||||
5638 | Diag(Loc, diag::err_invalid_declarator_in_function) | ||||
5639 | << Name << SS.getRange(); | ||||
5640 | else if (isa<BlockDecl>(Cur)) | ||||
5641 | Diag(Loc, diag::err_invalid_declarator_in_block) | ||||
5642 | << Name << SS.getRange(); | ||||
5643 | else | ||||
5644 | Diag(Loc, diag::err_invalid_declarator_scope) | ||||
5645 | << Name << cast<NamedDecl>(Cur) << cast<NamedDecl>(DC) << SS.getRange(); | ||||
5646 | |||||
5647 | return true; | ||||
5648 | } | ||||
5649 | |||||
5650 | if (Cur->isRecord()) { | ||||
5651 | // Cannot qualify members within a class. | ||||
5652 | Diag(Loc, diag::err_member_qualification) | ||||
5653 | << Name << SS.getRange(); | ||||
5654 | SS.clear(); | ||||
5655 | |||||
5656 | // C++ constructors and destructors with incorrect scopes can break | ||||
5657 | // our AST invariants by having the wrong underlying types. If | ||||
5658 | // that's the case, then drop this declaration entirely. | ||||
5659 | if ((Name.getNameKind() == DeclarationName::CXXConstructorName || | ||||
5660 | Name.getNameKind() == DeclarationName::CXXDestructorName) && | ||||
5661 | !Context.hasSameType(Name.getCXXNameType(), | ||||
5662 | Context.getTypeDeclType(cast<CXXRecordDecl>(Cur)))) | ||||
5663 | return true; | ||||
5664 | |||||
5665 | return false; | ||||
5666 | } | ||||
5667 | |||||
5668 | // C++11 [dcl.meaning]p1: | ||||
5669 | // [...] "The nested-name-specifier of the qualified declarator-id shall | ||||
5670 | // not begin with a decltype-specifer" | ||||
5671 | NestedNameSpecifierLoc SpecLoc(SS.getScopeRep(), SS.location_data()); | ||||
5672 | while (SpecLoc.getPrefix()) | ||||
5673 | SpecLoc = SpecLoc.getPrefix(); | ||||
5674 | if (dyn_cast_or_null<DecltypeType>( | ||||
5675 | SpecLoc.getNestedNameSpecifier()->getAsType())) | ||||
5676 | Diag(Loc, diag::err_decltype_in_declarator) | ||||
5677 | << SpecLoc.getTypeLoc().getSourceRange(); | ||||
5678 | |||||
5679 | return false; | ||||
5680 | } | ||||
5681 | |||||
5682 | NamedDecl *Sema::HandleDeclarator(Scope *S, Declarator &D, | ||||
5683 | MultiTemplateParamsArg TemplateParamLists) { | ||||
5684 | // TODO: consider using NameInfo for diagnostic. | ||||
5685 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); | ||||
5686 | DeclarationName Name = NameInfo.getName(); | ||||
5687 | |||||
5688 | // All of these full declarators require an identifier. If it doesn't have | ||||
5689 | // one, the ParsedFreeStandingDeclSpec action should be used. | ||||
5690 | if (D.isDecompositionDeclarator()) { | ||||
5691 | return ActOnDecompositionDeclarator(S, D, TemplateParamLists); | ||||
5692 | } else if (!Name) { | ||||
5693 | if (!D.isInvalidType()) // Reject this if we think it is valid. | ||||
5694 | Diag(D.getDeclSpec().getBeginLoc(), diag::err_declarator_need_ident) | ||||
5695 | << D.getDeclSpec().getSourceRange() << D.getSourceRange(); | ||||
5696 | return nullptr; | ||||
5697 | } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) | ||||
5698 | return nullptr; | ||||
5699 | |||||
5700 | // The scope passed in may not be a decl scope. Zip up the scope tree until | ||||
5701 | // we find one that is. | ||||
5702 | while ((S->getFlags() & Scope::DeclScope) == 0 || | ||||
5703 | (S->getFlags() & Scope::TemplateParamScope) != 0) | ||||
5704 | S = S->getParent(); | ||||
5705 | |||||
5706 | DeclContext *DC = CurContext; | ||||
5707 | if (D.getCXXScopeSpec().isInvalid()) | ||||
5708 | D.setInvalidType(); | ||||
5709 | else if (D.getCXXScopeSpec().isSet()) { | ||||
5710 | if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), | ||||
5711 | UPPC_DeclarationQualifier)) | ||||
5712 | return nullptr; | ||||
5713 | |||||
5714 | bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); | ||||
5715 | DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); | ||||
5716 | if (!DC || isa<EnumDecl>(DC)) { | ||||
5717 | // If we could not compute the declaration context, it's because the | ||||
5718 | // declaration context is dependent but does not refer to a class, | ||||
5719 | // class template, or class template partial specialization. Complain | ||||
5720 | // and return early, to avoid the coming semantic disaster. | ||||
5721 | Diag(D.getIdentifierLoc(), | ||||
5722 | diag::err_template_qualified_declarator_no_match) | ||||
5723 | << D.getCXXScopeSpec().getScopeRep() | ||||
5724 | << D.getCXXScopeSpec().getRange(); | ||||
5725 | return nullptr; | ||||
5726 | } | ||||
5727 | bool IsDependentContext = DC->isDependentContext(); | ||||
5728 | |||||
5729 | if (!IsDependentContext && | ||||
5730 | RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) | ||||
5731 | return nullptr; | ||||
5732 | |||||
5733 | // If a class is incomplete, do not parse entities inside it. | ||||
5734 | if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { | ||||
5735 | Diag(D.getIdentifierLoc(), | ||||
5736 | diag::err_member_def_undefined_record) | ||||
5737 | << Name << DC << D.getCXXScopeSpec().getRange(); | ||||
5738 | return nullptr; | ||||
5739 | } | ||||
5740 | if (!D.getDeclSpec().isFriendSpecified()) { | ||||
5741 | if (diagnoseQualifiedDeclaration( | ||||
5742 | D.getCXXScopeSpec(), DC, Name, D.getIdentifierLoc(), | ||||
5743 | D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId)) { | ||||
5744 | if (DC->isRecord()) | ||||
5745 | return nullptr; | ||||
5746 | |||||
5747 | D.setInvalidType(); | ||||
5748 | } | ||||
5749 | } | ||||
5750 | |||||
5751 | // Check whether we need to rebuild the type of the given | ||||
5752 | // declaration in the current instantiation. | ||||
5753 | if (EnteringContext && IsDependentContext && | ||||
5754 | TemplateParamLists.size() != 0) { | ||||
5755 | ContextRAII SavedContext(*this, DC); | ||||
5756 | if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) | ||||
5757 | D.setInvalidType(); | ||||
5758 | } | ||||
5759 | } | ||||
5760 | |||||
5761 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); | ||||
5762 | QualType R = TInfo->getType(); | ||||
5763 | |||||
5764 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, | ||||
5765 | UPPC_DeclarationType)) | ||||
5766 | D.setInvalidType(); | ||||
5767 | |||||
5768 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, | ||||
5769 | forRedeclarationInCurContext()); | ||||
5770 | |||||
5771 | // See if this is a redefinition of a variable in the same scope. | ||||
5772 | if (!D.getCXXScopeSpec().isSet()) { | ||||
5773 | bool IsLinkageLookup = false; | ||||
5774 | bool CreateBuiltins = false; | ||||
5775 | |||||
5776 | // If the declaration we're planning to build will be a function | ||||
5777 | // or object with linkage, then look for another declaration with | ||||
5778 | // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). | ||||
5779 | // | ||||
5780 | // If the declaration we're planning to build will be declared with | ||||
5781 | // external linkage in the translation unit, create any builtin with | ||||
5782 | // the same name. | ||||
5783 | if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) | ||||
5784 | /* Do nothing*/; | ||||
5785 | else if (CurContext->isFunctionOrMethod() && | ||||
5786 | (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern || | ||||
5787 | R->isFunctionType())) { | ||||
5788 | IsLinkageLookup = true; | ||||
5789 | CreateBuiltins = | ||||
5790 | CurContext->getEnclosingNamespaceContext()->isTranslationUnit(); | ||||
5791 | } else if (CurContext->getRedeclContext()->isTranslationUnit() && | ||||
5792 | D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) | ||||
5793 | CreateBuiltins = true; | ||||
5794 | |||||
5795 | if (IsLinkageLookup) { | ||||
5796 | Previous.clear(LookupRedeclarationWithLinkage); | ||||
5797 | Previous.setRedeclarationKind(ForExternalRedeclaration); | ||||
5798 | } | ||||
5799 | |||||
5800 | LookupName(Previous, S, CreateBuiltins); | ||||
5801 | } else { // Something like "int foo::x;" | ||||
5802 | LookupQualifiedName(Previous, DC); | ||||
5803 | |||||
5804 | // C++ [dcl.meaning]p1: | ||||
5805 | // When the declarator-id is qualified, the declaration shall refer to a | ||||
5806 | // previously declared member of the class or namespace to which the | ||||
5807 | // qualifier refers (or, in the case of a namespace, of an element of the | ||||
5808 | // inline namespace set of that namespace (7.3.1)) or to a specialization | ||||
5809 | // thereof; [...] | ||||
5810 | // | ||||
5811 | // Note that we already checked the context above, and that we do not have | ||||
5812 | // enough information to make sure that Previous contains the declaration | ||||
5813 | // we want to match. For example, given: | ||||
5814 | // | ||||
5815 | // class X { | ||||
5816 | // void f(); | ||||
5817 | // void f(float); | ||||
5818 | // }; | ||||
5819 | // | ||||
5820 | // void X::f(int) { } // ill-formed | ||||
5821 | // | ||||
5822 | // In this case, Previous will point to the overload set | ||||
5823 | // containing the two f's declared in X, but neither of them | ||||
5824 | // matches. | ||||
5825 | |||||
5826 | // C++ [dcl.meaning]p1: | ||||
5827 | // [...] the member shall not merely have been introduced by a | ||||
5828 | // using-declaration in the scope of the class or namespace nominated by | ||||
5829 | // the nested-name-specifier of the declarator-id. | ||||
5830 | RemoveUsingDecls(Previous); | ||||
5831 | } | ||||
5832 | |||||
5833 | if (Previous.isSingleResult() && | ||||
5834 | Previous.getFoundDecl()->isTemplateParameter()) { | ||||
5835 | // Maybe we will complain about the shadowed template parameter. | ||||
5836 | if (!D.isInvalidType()) | ||||
5837 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), | ||||
5838 | Previous.getFoundDecl()); | ||||
5839 | |||||
5840 | // Just pretend that we didn't see the previous declaration. | ||||
5841 | Previous.clear(); | ||||
5842 | } | ||||
5843 | |||||
5844 | if (!R->isFunctionType() && DiagnoseClassNameShadow(DC, NameInfo)) | ||||
5845 | // Forget that the previous declaration is the injected-class-name. | ||||
5846 | Previous.clear(); | ||||
5847 | |||||
5848 | // In C++, the previous declaration we find might be a tag type | ||||
5849 | // (class or enum). In this case, the new declaration will hide the | ||||
5850 | // tag type. Note that this applies to functions, function templates, and | ||||
5851 | // variables, but not to typedefs (C++ [dcl.typedef]p4) or variable templates. | ||||
5852 | if (Previous.isSingleTagDecl() && | ||||
5853 | D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && | ||||
5854 | (TemplateParamLists.size() == 0 || R->isFunctionType())) | ||||
5855 | Previous.clear(); | ||||
5856 | |||||
5857 | // Check that there are no default arguments other than in the parameters | ||||
5858 | // of a function declaration (C++ only). | ||||
5859 | if (getLangOpts().CPlusPlus) | ||||
5860 | CheckExtraCXXDefaultArguments(D); | ||||
5861 | |||||
5862 | NamedDecl *New; | ||||
5863 | |||||
5864 | bool AddToScope = true; | ||||
5865 | if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { | ||||
5866 | if (TemplateParamLists.size()) { | ||||
5867 | Diag(D.getIdentifierLoc(), diag::err_template_typedef); | ||||
5868 | return nullptr; | ||||
5869 | } | ||||
5870 | |||||
5871 | New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); | ||||
5872 | } else if (R->isFunctionType()) { | ||||
5873 | New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, | ||||
5874 | TemplateParamLists, | ||||
5875 | AddToScope); | ||||
5876 | } else { | ||||
5877 | New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, TemplateParamLists, | ||||
5878 | AddToScope); | ||||
5879 | } | ||||
5880 | |||||
5881 | if (!New) | ||||
5882 | return nullptr; | ||||
5883 | |||||
5884 | // If this has an identifier and is not a function template specialization, | ||||
5885 | // add it to the scope stack. | ||||
5886 | if (New->getDeclName() && AddToScope) | ||||
5887 | PushOnScopeChains(New, S); | ||||
5888 | |||||
5889 | if (isInOpenMPDeclareTargetContext()) | ||||
5890 | checkDeclIsAllowedInOpenMPTarget(nullptr, New); | ||||
5891 | |||||
5892 | return New; | ||||
5893 | } | ||||
5894 | |||||
5895 | /// Helper method to turn variable array types into constant array | ||||
5896 | /// types in certain situations which would otherwise be errors (for | ||||
5897 | /// GCC compatibility). | ||||
5898 | static QualType TryToFixInvalidVariablyModifiedType(QualType T, | ||||
5899 | ASTContext &Context, | ||||
5900 | bool &SizeIsNegative, | ||||
5901 | llvm::APSInt &Oversized) { | ||||
5902 | // This method tries to turn a variable array into a constant | ||||
5903 | // array even when the size isn't an ICE. This is necessary | ||||
5904 | // for compatibility with code that depends on gcc's buggy | ||||
5905 | // constant expression folding, like struct {char x[(int)(char*)2];} | ||||
5906 | SizeIsNegative = false; | ||||
5907 | Oversized = 0; | ||||
5908 | |||||
5909 | if (T->isDependentType()) | ||||
5910 | return QualType(); | ||||
5911 | |||||
5912 | QualifierCollector Qs; | ||||
5913 | const Type *Ty = Qs.strip(T); | ||||
5914 | |||||
5915 | if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { | ||||
5916 | QualType Pointee = PTy->getPointeeType(); | ||||
5917 | QualType FixedType = | ||||
5918 | TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, | ||||
5919 | Oversized); | ||||
5920 | if (FixedType.isNull()) return FixedType; | ||||
5921 | FixedType = Context.getPointerType(FixedType); | ||||
5922 | return Qs.apply(Context, FixedType); | ||||
5923 | } | ||||
5924 | if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { | ||||
5925 | QualType Inner = PTy->getInnerType(); | ||||
5926 | QualType FixedType = | ||||
5927 | TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, | ||||
5928 | Oversized); | ||||
5929 | if (FixedType.isNull()) return FixedType; | ||||
5930 | FixedType = Context.getParenType(FixedType); | ||||
5931 | return Qs.apply(Context, FixedType); | ||||
5932 | } | ||||
5933 | |||||
5934 | const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); | ||||
5935 | if (!VLATy) | ||||
5936 | return QualType(); | ||||
5937 | |||||
5938 | QualType ElemTy = VLATy->getElementType(); | ||||
5939 | if (ElemTy->isVariablyModifiedType()) { | ||||
5940 | ElemTy = TryToFixInvalidVariablyModifiedType(ElemTy, Context, | ||||
5941 | SizeIsNegative, Oversized); | ||||
5942 | if (ElemTy.isNull()) | ||||
5943 | return QualType(); | ||||
5944 | } | ||||
5945 | |||||
5946 | Expr::EvalResult Result; | ||||
5947 | if (!VLATy->getSizeExpr() || | ||||
5948 | !VLATy->getSizeExpr()->EvaluateAsInt(Result, Context)) | ||||
5949 | return QualType(); | ||||
5950 | |||||
5951 | llvm::APSInt Res = Result.Val.getInt(); | ||||
5952 | |||||
5953 | // Check whether the array size is negative. | ||||
5954 | if (Res.isSigned() && Res.isNegative()) { | ||||
5955 | SizeIsNegative = true; | ||||
5956 | return QualType(); | ||||
5957 | } | ||||
5958 | |||||
5959 | // Check whether the array is too large to be addressed. | ||||
5960 | unsigned ActiveSizeBits = | ||||
5961 | (!ElemTy->isDependentType() && !ElemTy->isVariablyModifiedType() && | ||||
5962 | !ElemTy->isIncompleteType() && !ElemTy->isUndeducedType()) | ||||
5963 | ? ConstantArrayType::getNumAddressingBits(Context, ElemTy, Res) | ||||
5964 | : Res.getActiveBits(); | ||||
5965 | if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { | ||||
5966 | Oversized = Res; | ||||
5967 | return QualType(); | ||||
5968 | } | ||||
5969 | |||||
5970 | QualType FoldedArrayType = Context.getConstantArrayType( | ||||
5971 | ElemTy, Res, VLATy->getSizeExpr(), ArrayType::Normal, 0); | ||||
5972 | return Qs.apply(Context, FoldedArrayType); | ||||
5973 | } | ||||
5974 | |||||
5975 | static void | ||||
5976 | FixInvalidVariablyModifiedTypeLoc(TypeLoc SrcTL, TypeLoc DstTL) { | ||||
5977 | SrcTL = SrcTL.getUnqualifiedLoc(); | ||||
5978 | DstTL = DstTL.getUnqualifiedLoc(); | ||||
5979 | if (PointerTypeLoc SrcPTL = SrcTL.getAs<PointerTypeLoc>()) { | ||||
5980 | PointerTypeLoc DstPTL = DstTL.castAs<PointerTypeLoc>(); | ||||
5981 | FixInvalidVariablyModifiedTypeLoc(SrcPTL.getPointeeLoc(), | ||||
5982 | DstPTL.getPointeeLoc()); | ||||
5983 | DstPTL.setStarLoc(SrcPTL.getStarLoc()); | ||||
5984 | return; | ||||
5985 | } | ||||
5986 | if (ParenTypeLoc SrcPTL = SrcTL.getAs<ParenTypeLoc>()) { | ||||
5987 | ParenTypeLoc DstPTL = DstTL.castAs<ParenTypeLoc>(); | ||||
5988 | FixInvalidVariablyModifiedTypeLoc(SrcPTL.getInnerLoc(), | ||||
5989 | DstPTL.getInnerLoc()); | ||||
5990 | DstPTL.setLParenLoc(SrcPTL.getLParenLoc()); | ||||
5991 | DstPTL.setRParenLoc(SrcPTL.getRParenLoc()); | ||||
5992 | return; | ||||
5993 | } | ||||
5994 | ArrayTypeLoc SrcATL = SrcTL.castAs<ArrayTypeLoc>(); | ||||
5995 | ArrayTypeLoc DstATL = DstTL.castAs<ArrayTypeLoc>(); | ||||
5996 | TypeLoc SrcElemTL = SrcATL.getElementLoc(); | ||||
5997 | TypeLoc DstElemTL = DstATL.getElementLoc(); | ||||
5998 | if (VariableArrayTypeLoc SrcElemATL = | ||||
5999 | SrcElemTL.getAs<VariableArrayTypeLoc>()) { | ||||
6000 | ConstantArrayTypeLoc DstElemATL = DstElemTL.castAs<ConstantArrayTypeLoc>(); | ||||
6001 | FixInvalidVariablyModifiedTypeLoc(SrcElemATL, DstElemATL); | ||||
6002 | } else { | ||||
6003 | DstElemTL.initializeFullCopy(SrcElemTL); | ||||
6004 | } | ||||
6005 | DstATL.setLBracketLoc(SrcATL.getLBracketLoc()); | ||||
6006 | DstATL.setSizeExpr(SrcATL.getSizeExpr()); | ||||
6007 | DstATL.setRBracketLoc(SrcATL.getRBracketLoc()); | ||||
6008 | } | ||||
6009 | |||||
6010 | /// Helper method to turn variable array types into constant array | ||||
6011 | /// types in certain situations which would otherwise be errors (for | ||||
6012 | /// GCC compatibility). | ||||
6013 | static TypeSourceInfo* | ||||
6014 | TryToFixInvalidVariablyModifiedTypeSourceInfo(TypeSourceInfo *TInfo, | ||||
6015 | ASTContext &Context, | ||||
6016 | bool &SizeIsNegative, | ||||
6017 | llvm::APSInt &Oversized) { | ||||
6018 | QualType FixedTy | ||||
6019 | = TryToFixInvalidVariablyModifiedType(TInfo->getType(), Context, | ||||
6020 | SizeIsNegative, Oversized); | ||||
6021 | if (FixedTy.isNull()) | ||||
6022 | return nullptr; | ||||
6023 | TypeSourceInfo *FixedTInfo = Context.getTrivialTypeSourceInfo(FixedTy); | ||||
6024 | FixInvalidVariablyModifiedTypeLoc(TInfo->getTypeLoc(), | ||||
6025 | FixedTInfo->getTypeLoc()); | ||||
6026 | return FixedTInfo; | ||||
6027 | } | ||||
6028 | |||||
6029 | /// Attempt to fold a variable-sized type to a constant-sized type, returning | ||||
6030 | /// true if we were successful. | ||||
6031 | static bool tryToFixVariablyModifiedVarType(Sema &S, TypeSourceInfo *&TInfo, | ||||
6032 | QualType &T, SourceLocation Loc, | ||||
6033 | unsigned FailedFoldDiagID) { | ||||
6034 | bool SizeIsNegative; | ||||
6035 | llvm::APSInt Oversized; | ||||
6036 | TypeSourceInfo *FixedTInfo = TryToFixInvalidVariablyModifiedTypeSourceInfo( | ||||
6037 | TInfo, S.Context, SizeIsNegative, Oversized); | ||||
6038 | if (FixedTInfo) { | ||||
6039 | S.Diag(Loc, diag::ext_vla_folded_to_constant); | ||||
6040 | TInfo = FixedTInfo; | ||||
6041 | T = FixedTInfo->getType(); | ||||
6042 | return true; | ||||
6043 | } | ||||
6044 | |||||
6045 | if (SizeIsNegative) | ||||
6046 | S.Diag(Loc, diag::err_typecheck_negative_array_size); | ||||
6047 | else if (Oversized.getBoolValue()) | ||||
6048 | S.Diag(Loc, diag::err_array_too_large) << Oversized.toString(10); | ||||
6049 | else if (FailedFoldDiagID) | ||||
6050 | S.Diag(Loc, FailedFoldDiagID); | ||||
6051 | return false; | ||||
6052 | } | ||||
6053 | |||||
6054 | /// Register the given locally-scoped extern "C" declaration so | ||||
6055 | /// that it can be found later for redeclarations. We include any extern "C" | ||||
6056 | /// declaration that is not visible in the translation unit here, not just | ||||
6057 | /// function-scope declarations. | ||||
6058 | void | ||||
6059 | Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, Scope *S) { | ||||
6060 | if (!getLangOpts().CPlusPlus && | ||||
6061 | ND->getLexicalDeclContext()->getRedeclContext()->isTranslationUnit()) | ||||
6062 | // Don't need to track declarations in the TU in C. | ||||
6063 | return; | ||||
6064 | |||||
6065 | // Note that we have a locally-scoped external with this name. | ||||
6066 | Context.getExternCContextDecl()->makeDeclVisibleInContext(ND); | ||||
6067 | } | ||||
6068 | |||||
6069 | NamedDecl *Sema::findLocallyScopedExternCDecl(DeclarationName Name) { | ||||
6070 | // FIXME: We can have multiple results via __attribute__((overloadable)). | ||||
6071 | auto Result = Context.getExternCContextDecl()->lookup(Name); | ||||
6072 | return Result.empty() ? nullptr : *Result.begin(); | ||||
6073 | } | ||||
6074 | |||||
6075 | /// Diagnose function specifiers on a declaration of an identifier that | ||||
6076 | /// does not identify a function. | ||||
6077 | void Sema::DiagnoseFunctionSpecifiers(const DeclSpec &DS) { | ||||
6078 | // FIXME: We should probably indicate the identifier in question to avoid | ||||
6079 | // confusion for constructs like "virtual int a(), b;" | ||||
6080 | if (DS.isVirtualSpecified()) | ||||
6081 | Diag(DS.getVirtualSpecLoc(), | ||||
6082 | diag::err_virtual_non_function); | ||||
6083 | |||||
6084 | if (DS.hasExplicitSpecifier()) | ||||
6085 | Diag(DS.getExplicitSpecLoc(), | ||||
6086 | diag::err_explicit_non_function); | ||||
6087 | |||||
6088 | if (DS.isNoreturnSpecified()) | ||||
6089 | Diag(DS.getNoreturnSpecLoc(), | ||||
6090 | diag::err_noreturn_non_function); | ||||
6091 | } | ||||
6092 | |||||
6093 | NamedDecl* | ||||
6094 | Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, | ||||
6095 | TypeSourceInfo *TInfo, LookupResult &Previous) { | ||||
6096 | // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). | ||||
6097 | if (D.getCXXScopeSpec().isSet()) { | ||||
6098 | Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) | ||||
6099 | << D.getCXXScopeSpec().getRange(); | ||||
6100 | D.setInvalidType(); | ||||
6101 | // Pretend we didn't see the scope specifier. | ||||
6102 | DC = CurContext; | ||||
6103 | Previous.clear(); | ||||
6104 | } | ||||
6105 | |||||
6106 | DiagnoseFunctionSpecifiers(D.getDeclSpec()); | ||||
6107 | |||||
6108 | if (D.getDeclSpec().isInlineSpecified()) | ||||
6109 | Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function) | ||||
6110 | << getLangOpts().CPlusPlus17; | ||||
6111 | if (D.getDeclSpec().hasConstexprSpecifier()) | ||||
6112 | Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) | ||||
6113 | << 1 << static_cast<int>(D.getDeclSpec().getConstexprSpecifier()); | ||||
6114 | |||||
6115 | if (D.getName().Kind != UnqualifiedIdKind::IK_Identifier) { | ||||
6116 | if (D.getName().Kind == UnqualifiedIdKind::IK_DeductionGuideName) | ||||
6117 | Diag(D.getName().StartLocation, | ||||
6118 | diag::err_deduction_guide_invalid_specifier) | ||||
6119 | << "typedef"; | ||||
6120 | else | ||||
6121 | Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) | ||||
6122 | << D.getName().getSourceRange(); | ||||
6123 | return nullptr; | ||||
6124 | } | ||||
6125 | |||||
6126 | TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); | ||||
6127 | if (!NewTD) return nullptr; | ||||
6128 | |||||
6129 | // Handle attributes prior to checking for duplicates in MergeVarDecl | ||||
6130 | ProcessDeclAttributes(S, NewTD, D); | ||||
6131 | |||||
6132 | CheckTypedefForVariablyModifiedType(S, NewTD); | ||||
6133 | |||||
6134 | bool Redeclaration = D.isRedeclaration(); | ||||
6135 | NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); | ||||
6136 | D.setRedeclaration(Redeclaration); | ||||
6137 | return ND; | ||||
6138 | } | ||||
6139 | |||||
6140 | void | ||||
6141 | Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { | ||||
6142 | // C99 6.7.7p2: If a typedef name specifies a variably modified type | ||||
6143 | // then it shall have block scope. | ||||
6144 | // Note that variably modified types must be fixed before merging the decl so | ||||
6145 | // that redeclarations will match. | ||||
6146 | TypeSourceInfo *TInfo = NewTD->getTypeSourceInfo(); | ||||
6147 | QualType T = TInfo->getType(); | ||||
6148 | if (T->isVariablyModifiedType()) { | ||||
6149 | setFunctionHasBranchProtectedScope(); | ||||
6150 | |||||
6151 | if (S->getFnParent() == nullptr) { | ||||
6152 | bool SizeIsNegative; | ||||
6153 | llvm::APSInt Oversized; | ||||
6154 | TypeSourceInfo *FixedTInfo = | ||||
6155 | TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context, | ||||
6156 | SizeIsNegative, | ||||
6157 | Oversized); | ||||
6158 | if (FixedTInfo) { | ||||
6159 | Diag(NewTD->getLocation(), diag::ext_vla_folded_to_constant); | ||||
6160 | NewTD->setTypeSourceInfo(FixedTInfo); | ||||
6161 | } else { | ||||
6162 | if (SizeIsNegative) | ||||
6163 | Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); | ||||
6164 | else if (T->isVariableArrayType()) | ||||
6165 | Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); | ||||
6166 | else if (Oversized.getBoolValue()) | ||||
6167 | Diag(NewTD->getLocation(), diag::err_array_too_large) | ||||
6168 | << Oversized.toString(10); | ||||
6169 | else | ||||
6170 | Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); | ||||
6171 | NewTD->setInvalidDecl(); | ||||
6172 | } | ||||
6173 | } | ||||
6174 | } | ||||
6175 | } | ||||
6176 | |||||
6177 | /// ActOnTypedefNameDecl - Perform semantic checking for a declaration which | ||||
6178 | /// declares a typedef-name, either using the 'typedef' type specifier or via | ||||
6179 | /// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. | ||||
6180 | NamedDecl* | ||||
6181 | Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, | ||||
6182 | LookupResult &Previous, bool &Redeclaration) { | ||||
6183 | |||||
6184 | // Find the shadowed declaration before filtering for scope. | ||||
6185 | NamedDecl *ShadowedDecl = getShadowedDeclaration(NewTD, Previous); | ||||
6186 | |||||
6187 | // Merge the decl with the existing one if appropriate. If the decl is | ||||
6188 | // in an outer scope, it isn't the same thing. | ||||
6189 | FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/false, | ||||
6190 | /*AllowInlineNamespace*/false); | ||||
6191 | filterNonConflictingPreviousTypedefDecls(*this, NewTD, Previous); | ||||
6192 | if (!Previous.empty()) { | ||||
6193 | Redeclaration = true; | ||||
6194 | MergeTypedefNameDecl(S, NewTD, Previous); | ||||
6195 | } else { | ||||
6196 | inferGslPointerAttribute(NewTD); | ||||
6197 | } | ||||
6198 | |||||
6199 | if (ShadowedDecl && !Redeclaration) | ||||
6200 | CheckShadow(NewTD, ShadowedDecl, Previous); | ||||
6201 | |||||
6202 | // If this is the C FILE type, notify the AST context. | ||||
6203 | if (IdentifierInfo *II = NewTD->getIdentifier()) | ||||
6204 | if (!NewTD->isInvalidDecl() && | ||||
6205 | NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { | ||||
6206 | if (II->isStr("FILE")) | ||||
6207 | Context.setFILEDecl(NewTD); | ||||
6208 | else if (II->isStr("jmp_buf")) | ||||
6209 | Context.setjmp_bufDecl(NewTD); | ||||
6210 | else if (II->isStr("sigjmp_buf")) | ||||
6211 | Context.setsigjmp_bufDecl(NewTD); | ||||
6212 | else if (II->isStr("ucontext_t")) | ||||
6213 | Context.setucontext_tDecl(NewTD); | ||||
6214 | } | ||||
6215 | |||||
6216 | return NewTD; | ||||
6217 | } | ||||
6218 | |||||
6219 | /// Determines whether the given declaration is an out-of-scope | ||||
6220 | /// previous declaration. | ||||
6221 | /// | ||||
6222 | /// This routine should be invoked when name lookup has found a | ||||
6223 | /// previous declaration (PrevDecl) that is not in the scope where a | ||||
6224 | /// new declaration by the same name is being introduced. If the new | ||||
6225 | /// declaration occurs in a local scope, previous declarations with | ||||
6226 | /// linkage may still be considered previous declarations (C99 | ||||
6227 | /// 6.2.2p4-5, C++ [basic.link]p6). | ||||
6228 | /// | ||||
6229 | /// \param PrevDecl the previous declaration found by name | ||||
6230 | /// lookup | ||||
6231 | /// | ||||
6232 | /// \param DC the context in which the new declaration is being | ||||
6233 | /// declared. | ||||
6234 | /// | ||||
6235 | /// \returns true if PrevDecl is an out-of-scope previous declaration | ||||
6236 | /// for a new delcaration with the same name. | ||||
6237 | static bool | ||||
6238 | isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, | ||||
6239 | ASTContext &Context) { | ||||
6240 | if (!PrevDecl) | ||||
6241 | return false; | ||||
6242 | |||||
6243 | if (!PrevDecl->hasLinkage()) | ||||
6244 | return false; | ||||
6245 | |||||
6246 | if (Context.getLangOpts().CPlusPlus) { | ||||
6247 | // C++ [basic.link]p6: | ||||
6248 | // If there is a visible declaration of an entity with linkage | ||||
6249 | // having the same name and type, ignoring entities declared | ||||
6250 | // outside the innermost enclosing namespace scope, the block | ||||
6251 | // scope declaration declares that same entity and receives the | ||||
6252 | // linkage of the previous declaration. | ||||
6253 | DeclContext *OuterContext = DC->getRedeclContext(); | ||||
6254 | if (!OuterContext->isFunctionOrMethod()) | ||||
6255 | // This rule only applies to block-scope declarations. | ||||
6256 | return false; | ||||
6257 | |||||
6258 | DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); | ||||
6259 | if (PrevOuterContext->isRecord()) | ||||
6260 | // We found a member function: ignore it. | ||||
6261 | return false; | ||||
6262 | |||||
6263 | // Find the innermost enclosing namespace for the new and | ||||
6264 | // previous declarations. | ||||
6265 | OuterContext = OuterContext->getEnclosingNamespaceContext(); | ||||
6266 | PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); | ||||
6267 | |||||
6268 | // The previous declaration is in a different namespace, so it | ||||
6269 | // isn't the same function. | ||||
6270 | if (!OuterContext->Equals(PrevOuterContext)) | ||||
6271 | return false; | ||||
6272 | } | ||||
6273 | |||||
6274 | return true; | ||||
6275 | } | ||||
6276 | |||||
6277 | static void SetNestedNameSpecifier(Sema &S, DeclaratorDecl *DD, Declarator &D) { | ||||
6278 | CXXScopeSpec &SS = D.getCXXScopeSpec(); | ||||
6279 | if (!SS.isSet()) return; | ||||
6280 | DD->setQualifierInfo(SS.getWithLocInContext(S.Context)); | ||||
6281 | } | ||||
6282 | |||||
6283 | bool Sema::inferObjCARCLifetime(ValueDecl *decl) { | ||||
6284 | QualType type = decl->getType(); | ||||
6285 | Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); | ||||
6286 | if (lifetime == Qualifiers::OCL_Autoreleasing) { | ||||
6287 | // Various kinds of declaration aren't allowed to be __autoreleasing. | ||||
6288 | unsigned kind = -1U; | ||||
6289 | if (VarDecl *var = dyn_cast<VarDecl>(decl)) { | ||||
6290 | if (var->hasAttr<BlocksAttr>()) | ||||
6291 | kind = 0; // __block | ||||
6292 | else if (!var->hasLocalStorage()) | ||||
6293 | kind = 1; // global | ||||
6294 | } else if (isa<ObjCIvarDecl>(decl)) { | ||||
6295 | kind = 3; // ivar | ||||
6296 | } else if (isa<FieldDecl>(decl)) { | ||||
6297 | kind = 2; // field | ||||
6298 | } | ||||
6299 | |||||
6300 | if (kind != -1U) { | ||||
6301 | Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) | ||||
6302 | << kind; | ||||
6303 | } | ||||
6304 | } else if (lifetime == Qualifiers::OCL_None) { | ||||
6305 | // Try to infer lifetime. | ||||
6306 | if (!type->isObjCLifetimeType()) | ||||
6307 | return false; | ||||
6308 | |||||
6309 | lifetime = type->getObjCARCImplicitLifetime(); | ||||
6310 | type = Context.getLifetimeQualifiedType(type, lifetime); | ||||
6311 | decl->setType(type); | ||||
6312 | } | ||||
6313 | |||||
6314 | if (VarDecl *var = dyn_cast<VarDecl>(decl)) { | ||||
6315 | // Thread-local variables cannot have lifetime. | ||||
6316 | if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && | ||||
6317 | var->getTLSKind()) { | ||||
6318 | Diag(var->getLocation(), diag::err_arc_thread_ownership) | ||||
6319 | << var->getType(); | ||||
6320 | return true; | ||||
6321 | } | ||||
6322 | } | ||||
6323 | |||||
6324 | return false; | ||||
6325 | } | ||||
6326 | |||||
6327 | void Sema::deduceOpenCLAddressSpace(ValueDecl *Decl) { | ||||
6328 | if (Decl->getType().hasAddressSpace()) | ||||
6329 | return; | ||||
6330 | if (Decl->getType()->isDependentType()) | ||||
6331 | return; | ||||
6332 | if (VarDecl *Var = dyn_cast<VarDecl>(Decl)) { | ||||
6333 | QualType Type = Var->getType(); | ||||
6334 | if (Type->isSamplerT() || Type->isVoidType()) | ||||
6335 | return; | ||||
6336 | LangAS ImplAS = LangAS::opencl_private; | ||||
6337 | if ((getLangOpts().OpenCLCPlusPlus || getLangOpts().OpenCLVersion >= 200) && | ||||
6338 | Var->hasGlobalStorage()) | ||||
6339 | ImplAS = LangAS::opencl_global; | ||||
6340 | // If the original type from a decayed type is an array type and that array | ||||
6341 | // type has no address space yet, deduce it now. | ||||
6342 | if (auto DT = dyn_cast<DecayedType>(Type)) { | ||||
6343 | auto OrigTy = DT->getOriginalType(); | ||||
6344 | if (!OrigTy.hasAddressSpace() && OrigTy->isArrayType()) { | ||||
6345 | // Add the address space to the original array type and then propagate | ||||
6346 | // that to the element type through `getAsArrayType`. | ||||
6347 | OrigTy = Context.getAddrSpaceQualType(OrigTy, ImplAS); | ||||
6348 | OrigTy = QualType(Context.getAsArrayType(OrigTy), 0); | ||||
6349 | // Re-generate the decayed type. | ||||
6350 | Type = Context.getDecayedType(OrigTy); | ||||
6351 | } | ||||
6352 | } | ||||
6353 | Type = Context.getAddrSpaceQualType(Type, ImplAS); | ||||
6354 | // Apply any qualifiers (including address space) from the array type to | ||||
6355 | // the element type. This implements C99 6.7.3p8: "If the specification of | ||||
6356 | // an array type includes any type qualifiers, the element type is so | ||||
6357 | // qualified, not the array type." | ||||
6358 | if (Type->isArrayType()) | ||||
6359 | Type = QualType(Context.getAsArrayType(Type), 0); | ||||
6360 | Decl->setType(Type); | ||||
6361 | } | ||||
6362 | } | ||||
6363 | |||||
6364 | static void checkAttributesAfterMerging(Sema &S, NamedDecl &ND) { | ||||
6365 | // Ensure that an auto decl is deduced otherwise the checks below might cache | ||||
6366 | // the wrong linkage. | ||||
6367 | assert(S.ParsingInitForAutoVars.count(&ND) == 0)((S.ParsingInitForAutoVars.count(&ND) == 0) ? static_cast <void> (0) : __assert_fail ("S.ParsingInitForAutoVars.count(&ND) == 0" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 6367, __PRETTY_FUNCTION__)); | ||||
6368 | |||||
6369 | // 'weak' only applies to declarations with external linkage. | ||||
6370 | if (WeakAttr *Attr = ND.getAttr<WeakAttr>()) { | ||||
6371 | if (!ND.isExternallyVisible()) { | ||||
6372 | S.Diag(Attr->getLocation(), diag::err_attribute_weak_static); | ||||
6373 | ND.dropAttr<WeakAttr>(); | ||||
6374 | } | ||||
6375 | } | ||||
6376 | if (WeakRefAttr *Attr = ND.getAttr<WeakRefAttr>()) { | ||||
6377 | if (ND.isExternallyVisible()) { | ||||
6378 | S.Diag(Attr->getLocation(), diag::err_attribute_weakref_not_static); | ||||
6379 | ND.dropAttr<WeakRefAttr>(); | ||||
6380 | ND.dropAttr<AliasAttr>(); | ||||
6381 | } | ||||
6382 | } | ||||
6383 | |||||
6384 | if (auto *VD = dyn_cast<VarDecl>(&ND)) { | ||||
6385 | if (VD->hasInit()) { | ||||
6386 | if (const auto *Attr = VD->getAttr<AliasAttr>()) { | ||||
6387 | assert(VD->isThisDeclarationADefinition() &&((VD->isThisDeclarationADefinition() && !VD->isExternallyVisible () && "Broken AliasAttr handled late!") ? static_cast <void> (0) : __assert_fail ("VD->isThisDeclarationADefinition() && !VD->isExternallyVisible() && \"Broken AliasAttr handled late!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 6388, __PRETTY_FUNCTION__)) | ||||
6388 | !VD->isExternallyVisible() && "Broken AliasAttr handled late!")((VD->isThisDeclarationADefinition() && !VD->isExternallyVisible () && "Broken AliasAttr handled late!") ? static_cast <void> (0) : __assert_fail ("VD->isThisDeclarationADefinition() && !VD->isExternallyVisible() && \"Broken AliasAttr handled late!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 6388, __PRETTY_FUNCTION__)); | ||||
6389 | S.Diag(Attr->getLocation(), diag::err_alias_is_definition) << VD << 0; | ||||
6390 | VD->dropAttr<AliasAttr>(); | ||||
6391 | } | ||||
6392 | } | ||||
6393 | } | ||||
6394 | |||||
6395 | // 'selectany' only applies to externally visible variable declarations. | ||||
6396 | // It does not apply to functions. | ||||
6397 | if (SelectAnyAttr *Attr = ND.getAttr<SelectAnyAttr>()) { | ||||
6398 | if (isa<FunctionDecl>(ND) || !ND.isExternallyVisible()) { | ||||
6399 | S.Diag(Attr->getLocation(), | ||||
6400 | diag::err_attribute_selectany_non_extern_data); | ||||
6401 | ND.dropAttr<SelectAnyAttr>(); | ||||
6402 | } | ||||
6403 | } | ||||
6404 | |||||
6405 | if (const InheritableAttr *Attr = getDLLAttr(&ND)) { | ||||
6406 | auto *VD = dyn_cast<VarDecl>(&ND); | ||||
6407 | bool IsAnonymousNS = false; | ||||
6408 | bool IsMicrosoft = S.Context.getTargetInfo().getCXXABI().isMicrosoft(); | ||||
6409 | if (VD) { | ||||
6410 | const NamespaceDecl *NS = dyn_cast<NamespaceDecl>(VD->getDeclContext()); | ||||
6411 | while (NS && !IsAnonymousNS) { | ||||
6412 | IsAnonymousNS = NS->isAnonymousNamespace(); | ||||
6413 | NS = dyn_cast<NamespaceDecl>(NS->getParent()); | ||||
6414 | } | ||||
6415 | } | ||||
6416 | // dll attributes require external linkage. Static locals may have external | ||||
6417 | // linkage but still cannot be explicitly imported or exported. | ||||
6418 | // In Microsoft mode, a variable defined in anonymous namespace must have | ||||
6419 | // external linkage in order to be exported. | ||||
6420 | bool AnonNSInMicrosoftMode = IsAnonymousNS && IsMicrosoft; | ||||
6421 | if ((ND.isExternallyVisible() && AnonNSInMicrosoftMode) || | ||||
6422 | (!AnonNSInMicrosoftMode && | ||||
6423 | (!ND.isExternallyVisible() || (VD && VD->isStaticLocal())))) { | ||||
6424 | S.Diag(ND.getLocation(), diag::err_attribute_dll_not_extern) | ||||
6425 | << &ND << Attr; | ||||
6426 | ND.setInvalidDecl(); | ||||
6427 | } | ||||
6428 | } | ||||
6429 | |||||
6430 | // Virtual functions cannot be marked as 'notail'. | ||||
6431 | if (auto *Attr = ND.getAttr<NotTailCalledAttr>()) | ||||
6432 | if (auto *MD = dyn_cast<CXXMethodDecl>(&ND)) | ||||
6433 | if (MD->isVirtual()) { | ||||
6434 | S.Diag(ND.getLocation(), | ||||
6435 | diag::err_invalid_attribute_on_virtual_function) | ||||
6436 | << Attr; | ||||
6437 | ND.dropAttr<NotTailCalledAttr>(); | ||||
6438 | } | ||||
6439 | |||||
6440 | // Check the attributes on the function type, if any. | ||||
6441 | if (const auto *FD = dyn_cast<FunctionDecl>(&ND)) { | ||||
6442 | // Don't declare this variable in the second operand of the for-statement; | ||||
6443 | // GCC miscompiles that by ending its lifetime before evaluating the | ||||
6444 | // third operand. See gcc.gnu.org/PR86769. | ||||
6445 | AttributedTypeLoc ATL; | ||||
6446 | for (TypeLoc TL = FD->getTypeSourceInfo()->getTypeLoc(); | ||||
6447 | (ATL = TL.getAsAdjusted<AttributedTypeLoc>()); | ||||
6448 | TL = ATL.getModifiedLoc()) { | ||||
6449 | // The [[lifetimebound]] attribute can be applied to the implicit object | ||||
6450 | // parameter of a non-static member function (other than a ctor or dtor) | ||||
6451 | // by applying it to the function type. | ||||
6452 | if (const auto *A = ATL.getAttrAs<LifetimeBoundAttr>()) { | ||||
6453 | const auto *MD = dyn_cast<CXXMethodDecl>(FD); | ||||
6454 | if (!MD || MD->isStatic()) { | ||||
6455 | S.Diag(A->getLocation(), diag::err_lifetimebound_no_object_param) | ||||
6456 | << !MD << A->getRange(); | ||||
6457 | } else if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) { | ||||
6458 | S.Diag(A->getLocation(), diag::err_lifetimebound_ctor_dtor) | ||||
6459 | << isa<CXXDestructorDecl>(MD) << A->getRange(); | ||||
6460 | } | ||||
6461 | } | ||||
6462 | } | ||||
6463 | } | ||||
6464 | } | ||||
6465 | |||||
6466 | static void checkDLLAttributeRedeclaration(Sema &S, NamedDecl *OldDecl, | ||||
6467 | NamedDecl *NewDecl, | ||||
6468 | bool IsSpecialization, | ||||
6469 | bool IsDefinition) { | ||||
6470 | if (OldDecl->isInvalidDecl() || NewDecl->isInvalidDecl()) | ||||
6471 | return; | ||||
6472 | |||||
6473 | bool IsTemplate = false; | ||||
6474 | if (TemplateDecl *OldTD = dyn_cast<TemplateDecl>(OldDecl)) { | ||||
6475 | OldDecl = OldTD->getTemplatedDecl(); | ||||
6476 | IsTemplate = true; | ||||
6477 | if (!IsSpecialization) | ||||
6478 | IsDefinition = false; | ||||
6479 | } | ||||
6480 | if (TemplateDecl *NewTD = dyn_cast<TemplateDecl>(NewDecl)) { | ||||
6481 | NewDecl = NewTD->getTemplatedDecl(); | ||||
6482 | IsTemplate = true; | ||||
6483 | } | ||||
6484 | |||||
6485 | if (!OldDecl || !NewDecl) | ||||
6486 | return; | ||||
6487 | |||||
6488 | const DLLImportAttr *OldImportAttr = OldDecl->getAttr<DLLImportAttr>(); | ||||
6489 | const DLLExportAttr *OldExportAttr = OldDecl->getAttr<DLLExportAttr>(); | ||||
6490 | const DLLImportAttr *NewImportAttr = NewDecl->getAttr<DLLImportAttr>(); | ||||
6491 | const DLLExportAttr *NewExportAttr = NewDecl->getAttr<DLLExportAttr>(); | ||||
6492 | |||||
6493 | // dllimport and dllexport are inheritable attributes so we have to exclude | ||||
6494 | // inherited attribute instances. | ||||
6495 | bool HasNewAttr = (NewImportAttr && !NewImportAttr->isInherited()) || | ||||
6496 | (NewExportAttr && !NewExportAttr->isInherited()); | ||||
6497 | |||||
6498 | // A redeclaration is not allowed to add a dllimport or dllexport attribute, | ||||
6499 | // the only exception being explicit specializations. | ||||
6500 | // Implicitly generated declarations are also excluded for now because there | ||||
6501 | // is no other way to switch these to use dllimport or dllexport. | ||||
6502 | bool AddsAttr = !(OldImportAttr || OldExportAttr) && HasNewAttr; | ||||
6503 | |||||
6504 | if (AddsAttr && !IsSpecialization && !OldDecl->isImplicit()) { | ||||
6505 | // Allow with a warning for free functions and global variables. | ||||
6506 | bool JustWarn = false; | ||||
6507 | if (!OldDecl->isCXXClassMember()) { | ||||
6508 | auto *VD = dyn_cast<VarDecl>(OldDecl); | ||||
6509 | if (VD && !VD->getDescribedVarTemplate()) | ||||
6510 | JustWarn = true; | ||||
6511 | auto *FD = dyn_cast<FunctionDecl>(OldDecl); | ||||
6512 | if (FD && FD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) | ||||
6513 | JustWarn = true; | ||||
6514 | } | ||||
6515 | |||||
6516 | // We cannot change a declaration that's been used because IR has already | ||||
6517 | // been emitted. Dllimported functions will still work though (modulo | ||||
6518 | // address equality) as they can use the thunk. | ||||
6519 | if (OldDecl->isUsed()) | ||||
6520 | if (!isa<FunctionDecl>(OldDecl) || !NewImportAttr) | ||||
6521 | JustWarn = false; | ||||
6522 | |||||
6523 | unsigned DiagID = JustWarn ? diag::warn_attribute_dll_redeclaration | ||||
6524 | : diag::err_attribute_dll_redeclaration; | ||||
6525 | S.Diag(NewDecl->getLocation(), DiagID) | ||||
6526 | << NewDecl | ||||
6527 | << (NewImportAttr ? (const Attr *)NewImportAttr : NewExportAttr); | ||||
6528 | S.Diag(OldDecl->getLocation(), diag::note_previous_declaration); | ||||
6529 | if (!JustWarn) { | ||||
6530 | NewDecl->setInvalidDecl(); | ||||
6531 | return; | ||||
6532 | } | ||||
6533 | } | ||||
6534 | |||||
6535 | // A redeclaration is not allowed to drop a dllimport attribute, the only | ||||
6536 | // exceptions being inline function definitions (except for function | ||||
6537 | // templates), local extern declarations, qualified friend declarations or | ||||
6538 | // special MSVC extension: in the last case, the declaration is treated as if | ||||
6539 | // it were marked dllexport. | ||||
6540 | bool IsInline = false, IsStaticDataMember = false, IsQualifiedFriend = false; | ||||
6541 | bool IsMicrosoftABI = S.Context.getTargetInfo().shouldDLLImportComdatSymbols(); | ||||
6542 | if (const auto *VD = dyn_cast<VarDecl>(NewDecl)) { | ||||
6543 | // Ignore static data because out-of-line definitions are diagnosed | ||||
6544 | // separately. | ||||
6545 | IsStaticDataMember = VD->isStaticDataMember(); | ||||
6546 | IsDefinition = VD->isThisDeclarationADefinition(S.Context) != | ||||
6547 | VarDecl::DeclarationOnly; | ||||
6548 | } else if (const auto *FD = dyn_cast<FunctionDecl>(NewDecl)) { | ||||
6549 | IsInline = FD->isInlined(); | ||||
6550 | IsQualifiedFriend = FD->getQualifier() && | ||||
6551 | FD->getFriendObjectKind() == Decl::FOK_Declared; | ||||
6552 | } | ||||
6553 | |||||
6554 | if (OldImportAttr && !HasNewAttr && | ||||
6555 | (!IsInline || (IsMicrosoftABI && IsTemplate)) && !IsStaticDataMember && | ||||
6556 | !NewDecl->isLocalExternDecl() && !IsQualifiedFriend) { | ||||
6557 | if (IsMicrosoftABI && IsDefinition) { | ||||
6558 | S.Diag(NewDecl->getLocation(), | ||||
6559 | diag::warn_redeclaration_without_import_attribute) | ||||
6560 | << NewDecl; | ||||
6561 | S.Diag(OldDecl->getLocation(), diag::note_previous_declaration); | ||||
6562 | NewDecl->dropAttr<DLLImportAttr>(); | ||||
6563 | NewDecl->addAttr( | ||||
6564 | DLLExportAttr::CreateImplicit(S.Context, NewImportAttr->getRange())); | ||||
6565 | } else { | ||||
6566 | S.Diag(NewDecl->getLocation(), | ||||
6567 | diag::warn_redeclaration_without_attribute_prev_attribute_ignored) | ||||
6568 | << NewDecl << OldImportAttr; | ||||
6569 | S.Diag(OldDecl->getLocation(), diag::note_previous_declaration); | ||||
6570 | S.Diag(OldImportAttr->getLocation(), diag::note_previous_attribute); | ||||
6571 | OldDecl->dropAttr<DLLImportAttr>(); | ||||
6572 | NewDecl->dropAttr<DLLImportAttr>(); | ||||
6573 | } | ||||
6574 | } else if (IsInline && OldImportAttr && !IsMicrosoftABI) { | ||||
6575 | // In MinGW, seeing a function declared inline drops the dllimport | ||||
6576 | // attribute. | ||||
6577 | OldDecl->dropAttr<DLLImportAttr>(); | ||||
6578 | NewDecl->dropAttr<DLLImportAttr>(); | ||||
6579 | S.Diag(NewDecl->getLocation(), | ||||
6580 | diag::warn_dllimport_dropped_from_inline_function) | ||||
6581 | << NewDecl << OldImportAttr; | ||||
6582 | } | ||||
6583 | |||||
6584 | // A specialization of a class template member function is processed here | ||||
6585 | // since it's a redeclaration. If the parent class is dllexport, the | ||||
6586 | // specialization inherits that attribute. This doesn't happen automatically | ||||
6587 | // since the parent class isn't instantiated until later. | ||||
6588 | if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDecl)) { | ||||
6589 | if (MD->getTemplatedKind() == FunctionDecl::TK_MemberSpecialization && | ||||
6590 | !NewImportAttr && !NewExportAttr) { | ||||
6591 | if (const DLLExportAttr *ParentExportAttr = | ||||
6592 | MD->getParent()->getAttr<DLLExportAttr>()) { | ||||
6593 | DLLExportAttr *NewAttr = ParentExportAttr->clone(S.Context); | ||||
6594 | NewAttr->setInherited(true); | ||||
6595 | NewDecl->addAttr(NewAttr); | ||||
6596 | } | ||||
6597 | } | ||||
6598 | } | ||||
6599 | } | ||||
6600 | |||||
6601 | /// Given that we are within the definition of the given function, | ||||
6602 | /// will that definition behave like C99's 'inline', where the | ||||
6603 | /// definition is discarded except for optimization purposes? | ||||
6604 | static bool isFunctionDefinitionDiscarded(Sema &S, FunctionDecl *FD) { | ||||
6605 | // Try to avoid calling GetGVALinkageForFunction. | ||||
6606 | |||||
6607 | // All cases of this require the 'inline' keyword. | ||||
6608 | if (!FD->isInlined()) return false; | ||||
6609 | |||||
6610 | // This is only possible in C++ with the gnu_inline attribute. | ||||
6611 | if (S.getLangOpts().CPlusPlus && !FD->hasAttr<GNUInlineAttr>()) | ||||
6612 | return false; | ||||
6613 | |||||
6614 | // Okay, go ahead and call the relatively-more-expensive function. | ||||
6615 | return S.Context.GetGVALinkageForFunction(FD) == GVA_AvailableExternally; | ||||
6616 | } | ||||
6617 | |||||
6618 | /// Determine whether a variable is extern "C" prior to attaching | ||||
6619 | /// an initializer. We can't just call isExternC() here, because that | ||||
6620 | /// will also compute and cache whether the declaration is externally | ||||
6621 | /// visible, which might change when we attach the initializer. | ||||
6622 | /// | ||||
6623 | /// This can only be used if the declaration is known to not be a | ||||
6624 | /// redeclaration of an internal linkage declaration. | ||||
6625 | /// | ||||
6626 | /// For instance: | ||||
6627 | /// | ||||
6628 | /// auto x = []{}; | ||||
6629 | /// | ||||
6630 | /// Attaching the initializer here makes this declaration not externally | ||||
6631 | /// visible, because its type has internal linkage. | ||||
6632 | /// | ||||
6633 | /// FIXME: This is a hack. | ||||
6634 | template<typename T> | ||||
6635 | static bool isIncompleteDeclExternC(Sema &S, const T *D) { | ||||
6636 | if (S.getLangOpts().CPlusPlus) { | ||||
6637 | // In C++, the overloadable attribute negates the effects of extern "C". | ||||
6638 | if (!D->isInExternCContext() || D->template hasAttr<OverloadableAttr>()) | ||||
6639 | return false; | ||||
6640 | |||||
6641 | // So do CUDA's host/device attributes. | ||||
6642 | if (S.getLangOpts().CUDA && (D->template hasAttr<CUDADeviceAttr>() || | ||||
6643 | D->template hasAttr<CUDAHostAttr>())) | ||||
6644 | return false; | ||||
6645 | } | ||||
6646 | return D->isExternC(); | ||||
6647 | } | ||||
6648 | |||||
6649 | static bool shouldConsiderLinkage(const VarDecl *VD) { | ||||
6650 | const DeclContext *DC = VD->getDeclContext()->getRedeclContext(); | ||||
6651 | if (DC->isFunctionOrMethod() || isa<OMPDeclareReductionDecl>(DC) || | ||||
6652 | isa<OMPDeclareMapperDecl>(DC)) | ||||
6653 | return VD->hasExternalStorage(); | ||||
6654 | if (DC->isFileContext()) | ||||
6655 | return true; | ||||
6656 | if (DC->isRecord()) | ||||
6657 | return false; | ||||
6658 | if (isa<RequiresExprBodyDecl>(DC)) | ||||
6659 | return false; | ||||
6660 | llvm_unreachable("Unexpected context")::llvm::llvm_unreachable_internal("Unexpected context", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 6660); | ||||
6661 | } | ||||
6662 | |||||
6663 | static bool shouldConsiderLinkage(const FunctionDecl *FD) { | ||||
6664 | const DeclContext *DC = FD->getDeclContext()->getRedeclContext(); | ||||
6665 | if (DC->isFileContext() || DC->isFunctionOrMethod() || | ||||
6666 | isa<OMPDeclareReductionDecl>(DC) || isa<OMPDeclareMapperDecl>(DC)) | ||||
6667 | return true; | ||||
6668 | if (DC->isRecord()) | ||||
6669 | return false; | ||||
6670 | llvm_unreachable("Unexpected context")::llvm::llvm_unreachable_internal("Unexpected context", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 6670); | ||||
6671 | } | ||||
6672 | |||||
6673 | static bool hasParsedAttr(Scope *S, const Declarator &PD, | ||||
6674 | ParsedAttr::Kind Kind) { | ||||
6675 | // Check decl attributes on the DeclSpec. | ||||
6676 | if (PD.getDeclSpec().getAttributes().hasAttribute(Kind)) | ||||
6677 | return true; | ||||
6678 | |||||
6679 | // Walk the declarator structure, checking decl attributes that were in a type | ||||
6680 | // position to the decl itself. | ||||
6681 | for (unsigned I = 0, E = PD.getNumTypeObjects(); I != E; ++I) { | ||||
6682 | if (PD.getTypeObject(I).getAttrs().hasAttribute(Kind)) | ||||
6683 | return true; | ||||
6684 | } | ||||
6685 | |||||
6686 | // Finally, check attributes on the decl itself. | ||||
6687 | return PD.getAttributes().hasAttribute(Kind); | ||||
6688 | } | ||||
6689 | |||||
6690 | /// Adjust the \c DeclContext for a function or variable that might be a | ||||
6691 | /// function-local external declaration. | ||||
6692 | bool Sema::adjustContextForLocalExternDecl(DeclContext *&DC) { | ||||
6693 | if (!DC->isFunctionOrMethod()) | ||||
6694 | return false; | ||||
6695 | |||||
6696 | // If this is a local extern function or variable declared within a function | ||||
6697 | // template, don't add it into the enclosing namespace scope until it is | ||||
6698 | // instantiated; it might have a dependent type right now. | ||||
6699 | if (DC->isDependentContext()) | ||||
6700 | return true; | ||||
6701 | |||||
6702 | // C++11 [basic.link]p7: | ||||
6703 | // When a block scope declaration of an entity with linkage is not found to | ||||
6704 | // refer to some other declaration, then that entity is a member of the | ||||
6705 | // innermost enclosing namespace. | ||||
6706 | // | ||||
6707 | // Per C++11 [namespace.def]p6, the innermost enclosing namespace is a | ||||
6708 | // semantically-enclosing namespace, not a lexically-enclosing one. | ||||
6709 | while (!DC->isFileContext() && !isa<LinkageSpecDecl>(DC)) | ||||
6710 | DC = DC->getParent(); | ||||
6711 | return true; | ||||
6712 | } | ||||
6713 | |||||
6714 | /// Returns true if given declaration has external C language linkage. | ||||
6715 | static bool isDeclExternC(const Decl *D) { | ||||
6716 | if (const auto *FD = dyn_cast<FunctionDecl>(D)) | ||||
6717 | return FD->isExternC(); | ||||
6718 | if (const auto *VD = dyn_cast<VarDecl>(D)) | ||||
6719 | return VD->isExternC(); | ||||
6720 | |||||
6721 | llvm_unreachable("Unknown type of decl!")::llvm::llvm_unreachable_internal("Unknown type of decl!", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 6721); | ||||
6722 | } | ||||
6723 | /// Returns true if there hasn't been any invalid type diagnosed. | ||||
6724 | static bool diagnoseOpenCLTypes(Scope *S, Sema &Se, Declarator &D, | ||||
6725 | DeclContext *DC, QualType R) { | ||||
6726 | // OpenCL v2.0 s6.9.b - Image type can only be used as a function argument. | ||||
6727 | // OpenCL v2.0 s6.13.16.1 - Pipe type can only be used as a function | ||||
6728 | // argument. | ||||
6729 | if (R->isImageType() || R->isPipeType()) { | ||||
6730 | Se.Diag(D.getIdentifierLoc(), | ||||
6731 | diag::err_opencl_type_can_only_be_used_as_function_parameter) | ||||
6732 | << R; | ||||
6733 | D.setInvalidType(); | ||||
6734 | return false; | ||||
6735 | } | ||||
6736 | |||||
6737 | // OpenCL v1.2 s6.9.r: | ||||
6738 | // The event type cannot be used to declare a program scope variable. | ||||
6739 | // OpenCL v2.0 s6.9.q: | ||||
6740 | // The clk_event_t and reserve_id_t types cannot be declared in program | ||||
6741 | // scope. | ||||
6742 | if (NULL__null == S->getParent()) { | ||||
6743 | if (R->isReserveIDT() || R->isClkEventT() || R->isEventT()) { | ||||
6744 | Se.Diag(D.getIdentifierLoc(), | ||||
6745 | diag::err_invalid_type_for_program_scope_var) | ||||
6746 | << R; | ||||
6747 | D.setInvalidType(); | ||||
6748 | return false; | ||||
6749 | } | ||||
6750 | } | ||||
6751 | |||||
6752 | // OpenCL v1.0 s6.8.a.3: Pointers to functions are not allowed. | ||||
6753 | if (!Se.getOpenCLOptions().isEnabled("__cl_clang_function_pointers")) { | ||||
6754 | QualType NR = R; | ||||
6755 | while (NR->isPointerType() || NR->isMemberFunctionPointerType()) { | ||||
6756 | if (NR->isFunctionPointerType() || NR->isMemberFunctionPointerType()) { | ||||
6757 | Se.Diag(D.getIdentifierLoc(), diag::err_opencl_function_pointer); | ||||
6758 | D.setInvalidType(); | ||||
6759 | return false; | ||||
6760 | } | ||||
6761 | NR = NR->getPointeeType(); | ||||
6762 | } | ||||
6763 | } | ||||
6764 | |||||
6765 | if (!Se.getOpenCLOptions().isEnabled("cl_khr_fp16")) { | ||||
6766 | // OpenCL v1.2 s6.1.1.1: reject declaring variables of the half and | ||||
6767 | // half array type (unless the cl_khr_fp16 extension is enabled). | ||||
6768 | if (Se.Context.getBaseElementType(R)->isHalfType()) { | ||||
6769 | Se.Diag(D.getIdentifierLoc(), diag::err_opencl_half_declaration) << R; | ||||
6770 | D.setInvalidType(); | ||||
6771 | return false; | ||||
6772 | } | ||||
6773 | } | ||||
6774 | |||||
6775 | // OpenCL v1.2 s6.9.r: | ||||
6776 | // The event type cannot be used with the __local, __constant and __global | ||||
6777 | // address space qualifiers. | ||||
6778 | if (R->isEventT()) { | ||||
6779 | if (R.getAddressSpace() != LangAS::opencl_private) { | ||||
6780 | Se.Diag(D.getBeginLoc(), diag::err_event_t_addr_space_qual); | ||||
6781 | D.setInvalidType(); | ||||
6782 | return false; | ||||
6783 | } | ||||
6784 | } | ||||
6785 | |||||
6786 | // C++ for OpenCL does not allow the thread_local storage qualifier. | ||||
6787 | // OpenCL C does not support thread_local either, and | ||||
6788 | // also reject all other thread storage class specifiers. | ||||
6789 | DeclSpec::TSCS TSC = D.getDeclSpec().getThreadStorageClassSpec(); | ||||
6790 | if (TSC != TSCS_unspecified) { | ||||
6791 | bool IsCXX = Se.getLangOpts().OpenCLCPlusPlus; | ||||
6792 | Se.Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), | ||||
6793 | diag::err_opencl_unknown_type_specifier) | ||||
6794 | << IsCXX << Se.getLangOpts().getOpenCLVersionTuple().getAsString() | ||||
6795 | << DeclSpec::getSpecifierName(TSC) << 1; | ||||
6796 | D.setInvalidType(); | ||||
6797 | return false; | ||||
6798 | } | ||||
6799 | |||||
6800 | if (R->isSamplerT()) { | ||||
6801 | // OpenCL v1.2 s6.9.b p4: | ||||
6802 | // The sampler type cannot be used with the __local and __global address | ||||
6803 | // space qualifiers. | ||||
6804 | if (R.getAddressSpace() == LangAS::opencl_local || | ||||
6805 | R.getAddressSpace() == LangAS::opencl_global) { | ||||
6806 | Se.Diag(D.getIdentifierLoc(), diag::err_wrong_sampler_addressspace); | ||||
6807 | D.setInvalidType(); | ||||
6808 | } | ||||
6809 | |||||
6810 | // OpenCL v1.2 s6.12.14.1: | ||||
6811 | // A global sampler must be declared with either the constant address | ||||
6812 | // space qualifier or with the const qualifier. | ||||
6813 | if (DC->isTranslationUnit() && | ||||
6814 | !(R.getAddressSpace() == LangAS::opencl_constant || | ||||
6815 | R.isConstQualified())) { | ||||
6816 | Se.Diag(D.getIdentifierLoc(), diag::err_opencl_nonconst_global_sampler); | ||||
6817 | D.setInvalidType(); | ||||
6818 | } | ||||
6819 | if (D.isInvalidType()) | ||||
6820 | return false; | ||||
6821 | } | ||||
6822 | return true; | ||||
6823 | } | ||||
6824 | |||||
6825 | NamedDecl *Sema::ActOnVariableDeclarator( | ||||
6826 | Scope *S, Declarator &D, DeclContext *DC, TypeSourceInfo *TInfo, | ||||
6827 | LookupResult &Previous, MultiTemplateParamsArg TemplateParamLists, | ||||
6828 | bool &AddToScope, ArrayRef<BindingDecl *> Bindings) { | ||||
6829 | QualType R = TInfo->getType(); | ||||
6830 | DeclarationName Name = GetNameForDeclarator(D).getName(); | ||||
6831 | |||||
6832 | IdentifierInfo *II = Name.getAsIdentifierInfo(); | ||||
6833 | |||||
6834 | if (D.isDecompositionDeclarator()) { | ||||
6835 | // Take the name of the first declarator as our name for diagnostic | ||||
6836 | // purposes. | ||||
6837 | auto &Decomp = D.getDecompositionDeclarator(); | ||||
6838 | if (!Decomp.bindings().empty()) { | ||||
6839 | II = Decomp.bindings()[0].Name; | ||||
6840 | Name = II; | ||||
6841 | } | ||||
6842 | } else if (!II) { | ||||
6843 | Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) << Name; | ||||
6844 | return nullptr; | ||||
6845 | } | ||||
6846 | |||||
6847 | |||||
6848 | DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); | ||||
6849 | StorageClass SC = StorageClassSpecToVarDeclStorageClass(D.getDeclSpec()); | ||||
6850 | |||||
6851 | // dllimport globals without explicit storage class are treated as extern. We | ||||
6852 | // have to change the storage class this early to get the right DeclContext. | ||||
6853 | if (SC == SC_None && !DC->isRecord() && | ||||
6854 | hasParsedAttr(S, D, ParsedAttr::AT_DLLImport) && | ||||
6855 | !hasParsedAttr(S, D, ParsedAttr::AT_DLLExport)) | ||||
6856 | SC = SC_Extern; | ||||
6857 | |||||
6858 | DeclContext *OriginalDC = DC; | ||||
6859 | bool IsLocalExternDecl = SC == SC_Extern && | ||||
6860 | adjustContextForLocalExternDecl(DC); | ||||
6861 | |||||
6862 | if (SCSpec == DeclSpec::SCS_mutable) { | ||||
6863 | // mutable can only appear on non-static class members, so it's always | ||||
6864 | // an error here | ||||
6865 | Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); | ||||
6866 | D.setInvalidType(); | ||||
6867 | SC = SC_None; | ||||
6868 | } | ||||
6869 | |||||
6870 | if (getLangOpts().CPlusPlus11 && SCSpec == DeclSpec::SCS_register && | ||||
6871 | !D.getAsmLabel() && !getSourceManager().isInSystemMacro( | ||||
6872 | D.getDeclSpec().getStorageClassSpecLoc())) { | ||||
6873 | // In C++11, the 'register' storage class specifier is deprecated. | ||||
6874 | // Suppress the warning in system macros, it's used in macros in some | ||||
6875 | // popular C system headers, such as in glibc's htonl() macro. | ||||
6876 | Diag(D.getDeclSpec().getStorageClassSpecLoc(), | ||||
6877 | getLangOpts().CPlusPlus17 ? diag::ext_register_storage_class | ||||
6878 | : diag::warn_deprecated_register) | ||||
6879 | << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); | ||||
6880 | } | ||||
6881 | |||||
6882 | DiagnoseFunctionSpecifiers(D.getDeclSpec()); | ||||
6883 | |||||
6884 | if (!DC->isRecord() && S->getFnParent() == nullptr) { | ||||
6885 | // C99 6.9p2: The storage-class specifiers auto and register shall not | ||||
6886 | // appear in the declaration specifiers in an external declaration. | ||||
6887 | // Global Register+Asm is a GNU extension we support. | ||||
6888 | if (SC == SC_Auto || (SC == SC_Register && !D.getAsmLabel())) { | ||||
6889 | Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); | ||||
6890 | D.setInvalidType(); | ||||
6891 | } | ||||
6892 | } | ||||
6893 | |||||
6894 | // If this variable has a variable-modified type and an initializer, try to | ||||
6895 | // fold to a constant-sized type. This is otherwise invalid. | ||||
6896 | if (D.hasInitializer() && R->isVariablyModifiedType()) | ||||
6897 | tryToFixVariablyModifiedVarType(*this, TInfo, R, D.getIdentifierLoc(), | ||||
6898 | /*DiagID=*/0); | ||||
6899 | |||||
6900 | bool IsMemberSpecialization = false; | ||||
6901 | bool IsVariableTemplateSpecialization = false; | ||||
6902 | bool IsPartialSpecialization = false; | ||||
6903 | bool IsVariableTemplate = false; | ||||
6904 | VarDecl *NewVD = nullptr; | ||||
6905 | VarTemplateDecl *NewTemplate = nullptr; | ||||
6906 | TemplateParameterList *TemplateParams = nullptr; | ||||
6907 | if (!getLangOpts().CPlusPlus) { | ||||
6908 | NewVD = VarDecl::Create(Context, DC, D.getBeginLoc(), D.getIdentifierLoc(), | ||||
6909 | II, R, TInfo, SC); | ||||
6910 | |||||
6911 | if (R->getContainedDeducedType()) | ||||
6912 | ParsingInitForAutoVars.insert(NewVD); | ||||
6913 | |||||
6914 | if (D.isInvalidType()) | ||||
6915 | NewVD->setInvalidDecl(); | ||||
6916 | |||||
6917 | if (NewVD->getType().hasNonTrivialToPrimitiveDestructCUnion() && | ||||
6918 | NewVD->hasLocalStorage()) | ||||
6919 | checkNonTrivialCUnion(NewVD->getType(), NewVD->getLocation(), | ||||
6920 | NTCUC_AutoVar, NTCUK_Destruct); | ||||
6921 | } else { | ||||
6922 | bool Invalid = false; | ||||
6923 | |||||
6924 | if (DC->isRecord() && !CurContext->isRecord()) { | ||||
6925 | // This is an out-of-line definition of a static data member. | ||||
6926 | switch (SC) { | ||||
6927 | case SC_None: | ||||
6928 | break; | ||||
6929 | case SC_Static: | ||||
6930 | Diag(D.getDeclSpec().getStorageClassSpecLoc(), | ||||
6931 | diag::err_static_out_of_line) | ||||
6932 | << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); | ||||
6933 | break; | ||||
6934 | case SC_Auto: | ||||
6935 | case SC_Register: | ||||
6936 | case SC_Extern: | ||||
6937 | // [dcl.stc] p2: The auto or register specifiers shall be applied only | ||||
6938 | // to names of variables declared in a block or to function parameters. | ||||
6939 | // [dcl.stc] p6: The extern specifier cannot be used in the declaration | ||||
6940 | // of class members | ||||
6941 | |||||
6942 | Diag(D.getDeclSpec().getStorageClassSpecLoc(), | ||||
6943 | diag::err_storage_class_for_static_member) | ||||
6944 | << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); | ||||
6945 | break; | ||||
6946 | case SC_PrivateExtern: | ||||
6947 | llvm_unreachable("C storage class in c++!")::llvm::llvm_unreachable_internal("C storage class in c++!", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 6947); | ||||
6948 | } | ||||
6949 | } | ||||
6950 | |||||
6951 | if (SC == SC_Static && CurContext->isRecord()) { | ||||
6952 | if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { | ||||
6953 | // Walk up the enclosing DeclContexts to check for any that are | ||||
6954 | // incompatible with static data members. | ||||
6955 | const DeclContext *FunctionOrMethod = nullptr; | ||||
6956 | const CXXRecordDecl *AnonStruct = nullptr; | ||||
6957 | for (DeclContext *Ctxt = DC; Ctxt; Ctxt = Ctxt->getParent()) { | ||||
6958 | if (Ctxt->isFunctionOrMethod()) { | ||||
6959 | FunctionOrMethod = Ctxt; | ||||
6960 | break; | ||||
6961 | } | ||||
6962 | const CXXRecordDecl *ParentDecl = dyn_cast<CXXRecordDecl>(Ctxt); | ||||
6963 | if (ParentDecl && !ParentDecl->getDeclName()) { | ||||
6964 | AnonStruct = ParentDecl; | ||||
6965 | break; | ||||
6966 | } | ||||
6967 | } | ||||
6968 | if (FunctionOrMethod) { | ||||
6969 | // C++ [class.static.data]p5: A local class shall not have static data | ||||
6970 | // members. | ||||
6971 | Diag(D.getIdentifierLoc(), | ||||
6972 | diag::err_static_data_member_not_allowed_in_local_class) | ||||
6973 | << Name << RD->getDeclName() << RD->getTagKind(); | ||||
6974 | } else if (AnonStruct) { | ||||
6975 | // C++ [class.static.data]p4: Unnamed classes and classes contained | ||||
6976 | // directly or indirectly within unnamed classes shall not contain | ||||
6977 | // static data members. | ||||
6978 | Diag(D.getIdentifierLoc(), | ||||
6979 | diag::err_static_data_member_not_allowed_in_anon_struct) | ||||
6980 | << Name << AnonStruct->getTagKind(); | ||||
6981 | Invalid = true; | ||||
6982 | } else if (RD->isUnion()) { | ||||
6983 | // C++98 [class.union]p1: If a union contains a static data member, | ||||
6984 | // the program is ill-formed. C++11 drops this restriction. | ||||
6985 | Diag(D.getIdentifierLoc(), | ||||
6986 | getLangOpts().CPlusPlus11 | ||||
6987 | ? diag::warn_cxx98_compat_static_data_member_in_union | ||||
6988 | : diag::ext_static_data_member_in_union) << Name; | ||||
6989 | } | ||||
6990 | } | ||||
6991 | } | ||||
6992 | |||||
6993 | // Match up the template parameter lists with the scope specifier, then | ||||
6994 | // determine whether we have a template or a template specialization. | ||||
6995 | bool InvalidScope = false; | ||||
6996 | TemplateParams = MatchTemplateParametersToScopeSpecifier( | ||||
6997 | D.getDeclSpec().getBeginLoc(), D.getIdentifierLoc(), | ||||
6998 | D.getCXXScopeSpec(), | ||||
6999 | D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId | ||||
7000 | ? D.getName().TemplateId | ||||
7001 | : nullptr, | ||||
7002 | TemplateParamLists, | ||||
7003 | /*never a friend*/ false, IsMemberSpecialization, InvalidScope); | ||||
7004 | Invalid |= InvalidScope; | ||||
7005 | |||||
7006 | if (TemplateParams) { | ||||
7007 | if (!TemplateParams->size() && | ||||
7008 | D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId) { | ||||
7009 | // There is an extraneous 'template<>' for this variable. Complain | ||||
7010 | // about it, but allow the declaration of the variable. | ||||
7011 | Diag(TemplateParams->getTemplateLoc(), | ||||
7012 | diag::err_template_variable_noparams) | ||||
7013 | << II | ||||
7014 | << SourceRange(TemplateParams->getTemplateLoc(), | ||||
7015 | TemplateParams->getRAngleLoc()); | ||||
7016 | TemplateParams = nullptr; | ||||
7017 | } else { | ||||
7018 | // Check that we can declare a template here. | ||||
7019 | if (CheckTemplateDeclScope(S, TemplateParams)) | ||||
7020 | return nullptr; | ||||
7021 | |||||
7022 | if (D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId) { | ||||
7023 | // This is an explicit specialization or a partial specialization. | ||||
7024 | IsVariableTemplateSpecialization = true; | ||||
7025 | IsPartialSpecialization = TemplateParams->size() > 0; | ||||
7026 | } else { // if (TemplateParams->size() > 0) | ||||
7027 | // This is a template declaration. | ||||
7028 | IsVariableTemplate = true; | ||||
7029 | |||||
7030 | // Only C++1y supports variable templates (N3651). | ||||
7031 | Diag(D.getIdentifierLoc(), | ||||
7032 | getLangOpts().CPlusPlus14 | ||||
7033 | ? diag::warn_cxx11_compat_variable_template | ||||
7034 | : diag::ext_variable_template); | ||||
7035 | } | ||||
7036 | } | ||||
7037 | } else { | ||||
7038 | // Check that we can declare a member specialization here. | ||||
7039 | if (!TemplateParamLists.empty() && IsMemberSpecialization && | ||||
7040 | CheckTemplateDeclScope(S, TemplateParamLists.back())) | ||||
7041 | return nullptr; | ||||
7042 | assert((Invalid ||(((Invalid || D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId ) && "should have a 'template<>' for this decl" ) ? static_cast<void> (0) : __assert_fail ("(Invalid || D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId) && \"should have a 'template<>' for this decl\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 7044, __PRETTY_FUNCTION__)) | ||||
7043 | D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId) &&(((Invalid || D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId ) && "should have a 'template<>' for this decl" ) ? static_cast<void> (0) : __assert_fail ("(Invalid || D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId) && \"should have a 'template<>' for this decl\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 7044, __PRETTY_FUNCTION__)) | ||||
7044 | "should have a 'template<>' for this decl")(((Invalid || D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId ) && "should have a 'template<>' for this decl" ) ? static_cast<void> (0) : __assert_fail ("(Invalid || D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId) && \"should have a 'template<>' for this decl\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 7044, __PRETTY_FUNCTION__)); | ||||
7045 | } | ||||
7046 | |||||
7047 | if (IsVariableTemplateSpecialization) { | ||||
7048 | SourceLocation TemplateKWLoc = | ||||
7049 | TemplateParamLists.size() > 0 | ||||
7050 | ? TemplateParamLists[0]->getTemplateLoc() | ||||
7051 | : SourceLocation(); | ||||
7052 | DeclResult Res = ActOnVarTemplateSpecialization( | ||||
7053 | S, D, TInfo, TemplateKWLoc, TemplateParams, SC, | ||||
7054 | IsPartialSpecialization); | ||||
7055 | if (Res.isInvalid()) | ||||
7056 | return nullptr; | ||||
7057 | NewVD = cast<VarDecl>(Res.get()); | ||||
7058 | AddToScope = false; | ||||
7059 | } else if (D.isDecompositionDeclarator()) { | ||||
7060 | NewVD = DecompositionDecl::Create(Context, DC, D.getBeginLoc(), | ||||
7061 | D.getIdentifierLoc(), R, TInfo, SC, | ||||
7062 | Bindings); | ||||
7063 | } else | ||||
7064 | NewVD = VarDecl::Create(Context, DC, D.getBeginLoc(), | ||||
7065 | D.getIdentifierLoc(), II, R, TInfo, SC); | ||||
7066 | |||||
7067 | // If this is supposed to be a variable template, create it as such. | ||||
7068 | if (IsVariableTemplate) { | ||||
7069 | NewTemplate = | ||||
7070 | VarTemplateDecl::Create(Context, DC, D.getIdentifierLoc(), Name, | ||||
7071 | TemplateParams, NewVD); | ||||
7072 | NewVD->setDescribedVarTemplate(NewTemplate); | ||||
7073 | } | ||||
7074 | |||||
7075 | // If this decl has an auto type in need of deduction, make a note of the | ||||
7076 | // Decl so we can diagnose uses of it in its own initializer. | ||||
7077 | if (R->getContainedDeducedType()) | ||||
7078 | ParsingInitForAutoVars.insert(NewVD); | ||||
7079 | |||||
7080 | if (D.isInvalidType() || Invalid) { | ||||
7081 | NewVD->setInvalidDecl(); | ||||
7082 | if (NewTemplate) | ||||
7083 | NewTemplate->setInvalidDecl(); | ||||
7084 | } | ||||
7085 | |||||
7086 | SetNestedNameSpecifier(*this, NewVD, D); | ||||
7087 | |||||
7088 | // If we have any template parameter lists that don't directly belong to | ||||
7089 | // the variable (matching the scope specifier), store them. | ||||
7090 | unsigned VDTemplateParamLists = TemplateParams ? 1 : 0; | ||||
7091 | if (TemplateParamLists.size() > VDTemplateParamLists) | ||||
7092 | NewVD->setTemplateParameterListsInfo( | ||||
7093 | Context, TemplateParamLists.drop_back(VDTemplateParamLists)); | ||||
7094 | } | ||||
7095 | |||||
7096 | if (D.getDeclSpec().isInlineSpecified()) { | ||||
7097 | if (!getLangOpts().CPlusPlus) { | ||||
7098 | Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function) | ||||
7099 | << 0; | ||||
7100 | } else if (CurContext->isFunctionOrMethod()) { | ||||
7101 | // 'inline' is not allowed on block scope variable declaration. | ||||
7102 | Diag(D.getDeclSpec().getInlineSpecLoc(), | ||||
7103 | diag::err_inline_declaration_block_scope) << Name | ||||
7104 | << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); | ||||
7105 | } else { | ||||
7106 | Diag(D.getDeclSpec().getInlineSpecLoc(), | ||||
7107 | getLangOpts().CPlusPlus17 ? diag::warn_cxx14_compat_inline_variable | ||||
7108 | : diag::ext_inline_variable); | ||||
7109 | NewVD->setInlineSpecified(); | ||||
7110 | } | ||||
7111 | } | ||||
7112 | |||||
7113 | // Set the lexical context. If the declarator has a C++ scope specifier, the | ||||
7114 | // lexical context will be different from the semantic context. | ||||
7115 | NewVD->setLexicalDeclContext(CurContext); | ||||
7116 | if (NewTemplate) | ||||
7117 | NewTemplate->setLexicalDeclContext(CurContext); | ||||
7118 | |||||
7119 | if (IsLocalExternDecl) { | ||||
7120 | if (D.isDecompositionDeclarator()) | ||||
7121 | for (auto *B : Bindings) | ||||
7122 | B->setLocalExternDecl(); | ||||
7123 | else | ||||
7124 | NewVD->setLocalExternDecl(); | ||||
7125 | } | ||||
7126 | |||||
7127 | bool EmitTLSUnsupportedError = false; | ||||
7128 | if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) { | ||||
7129 | // C++11 [dcl.stc]p4: | ||||
7130 | // When thread_local is applied to a variable of block scope the | ||||
7131 | // storage-class-specifier static is implied if it does not appear | ||||
7132 | // explicitly. | ||||
7133 | // Core issue: 'static' is not implied if the variable is declared | ||||
7134 | // 'extern'. | ||||
7135 | if (NewVD->hasLocalStorage() && | ||||
7136 | (SCSpec != DeclSpec::SCS_unspecified || | ||||
7137 | TSCS != DeclSpec::TSCS_thread_local || | ||||
7138 | !DC->isFunctionOrMethod())) | ||||
7139 | Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), | ||||
7140 | diag::err_thread_non_global) | ||||
7141 | << DeclSpec::getSpecifierName(TSCS); | ||||
7142 | else if (!Context.getTargetInfo().isTLSSupported()) { | ||||
7143 | if (getLangOpts().CUDA || getLangOpts().OpenMPIsDevice || | ||||
7144 | getLangOpts().SYCLIsDevice) { | ||||
7145 | // Postpone error emission until we've collected attributes required to | ||||
7146 | // figure out whether it's a host or device variable and whether the | ||||
7147 | // error should be ignored. | ||||
7148 | EmitTLSUnsupportedError = true; | ||||
7149 | // We still need to mark the variable as TLS so it shows up in AST with | ||||
7150 | // proper storage class for other tools to use even if we're not going | ||||
7151 | // to emit any code for it. | ||||
7152 | NewVD->setTSCSpec(TSCS); | ||||
7153 | } else | ||||
7154 | Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), | ||||
7155 | diag::err_thread_unsupported); | ||||
7156 | } else | ||||
7157 | NewVD->setTSCSpec(TSCS); | ||||
7158 | } | ||||
7159 | |||||
7160 | switch (D.getDeclSpec().getConstexprSpecifier()) { | ||||
7161 | case ConstexprSpecKind::Unspecified: | ||||
7162 | break; | ||||
7163 | |||||
7164 | case ConstexprSpecKind::Consteval: | ||||
7165 | Diag(D.getDeclSpec().getConstexprSpecLoc(), | ||||
7166 | diag::err_constexpr_wrong_decl_kind) | ||||
7167 | << static_cast<int>(D.getDeclSpec().getConstexprSpecifier()); | ||||
7168 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||
7169 | |||||
7170 | case ConstexprSpecKind::Constexpr: | ||||
7171 | NewVD->setConstexpr(true); | ||||
7172 | MaybeAddCUDAConstantAttr(NewVD); | ||||
7173 | // C++1z [dcl.spec.constexpr]p1: | ||||
7174 | // A static data member declared with the constexpr specifier is | ||||
7175 | // implicitly an inline variable. | ||||
7176 | if (NewVD->isStaticDataMember() && | ||||
7177 | (getLangOpts().CPlusPlus17 || | ||||
7178 | Context.getTargetInfo().getCXXABI().isMicrosoft())) | ||||
7179 | NewVD->setImplicitlyInline(); | ||||
7180 | break; | ||||
7181 | |||||
7182 | case ConstexprSpecKind::Constinit: | ||||
7183 | if (!NewVD->hasGlobalStorage()) | ||||
7184 | Diag(D.getDeclSpec().getConstexprSpecLoc(), | ||||
7185 | diag::err_constinit_local_variable); | ||||
7186 | else | ||||
7187 | NewVD->addAttr(ConstInitAttr::Create( | ||||
7188 | Context, D.getDeclSpec().getConstexprSpecLoc(), | ||||
7189 | AttributeCommonInfo::AS_Keyword, ConstInitAttr::Keyword_constinit)); | ||||
7190 | break; | ||||
7191 | } | ||||
7192 | |||||
7193 | // C99 6.7.4p3 | ||||
7194 | // An inline definition of a function with external linkage shall | ||||
7195 | // not contain a definition of a modifiable object with static or | ||||
7196 | // thread storage duration... | ||||
7197 | // We only apply this when the function is required to be defined | ||||
7198 | // elsewhere, i.e. when the function is not 'extern inline'. Note | ||||
7199 | // that a local variable with thread storage duration still has to | ||||
7200 | // be marked 'static'. Also note that it's possible to get these | ||||
7201 | // semantics in C++ using __attribute__((gnu_inline)). | ||||
7202 | if (SC == SC_Static && S->getFnParent() != nullptr && | ||||
7203 | !NewVD->getType().isConstQualified()) { | ||||
7204 | FunctionDecl *CurFD = getCurFunctionDecl(); | ||||
7205 | if (CurFD && isFunctionDefinitionDiscarded(*this, CurFD)) { | ||||
7206 | Diag(D.getDeclSpec().getStorageClassSpecLoc(), | ||||
7207 | diag::warn_static_local_in_extern_inline); | ||||
7208 | MaybeSuggestAddingStaticToDecl(CurFD); | ||||
7209 | } | ||||
7210 | } | ||||
7211 | |||||
7212 | if (D.getDeclSpec().isModulePrivateSpecified()) { | ||||
7213 | if (IsVariableTemplateSpecialization) | ||||
7214 | Diag(NewVD->getLocation(), diag::err_module_private_specialization) | ||||
7215 | << (IsPartialSpecialization ? 1 : 0) | ||||
7216 | << FixItHint::CreateRemoval( | ||||
7217 | D.getDeclSpec().getModulePrivateSpecLoc()); | ||||
7218 | else if (IsMemberSpecialization) | ||||
7219 | Diag(NewVD->getLocation(), diag::err_module_private_specialization) | ||||
7220 | << 2 | ||||
7221 | << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); | ||||
7222 | else if (NewVD->hasLocalStorage()) | ||||
7223 | Diag(NewVD->getLocation(), diag::err_module_private_local) | ||||
7224 | << 0 << NewVD | ||||
7225 | << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) | ||||
7226 | << FixItHint::CreateRemoval( | ||||
7227 | D.getDeclSpec().getModulePrivateSpecLoc()); | ||||
7228 | else { | ||||
7229 | NewVD->setModulePrivate(); | ||||
7230 | if (NewTemplate) | ||||
7231 | NewTemplate->setModulePrivate(); | ||||
7232 | for (auto *B : Bindings) | ||||
7233 | B->setModulePrivate(); | ||||
7234 | } | ||||
7235 | } | ||||
7236 | |||||
7237 | if (getLangOpts().OpenCL) { | ||||
7238 | |||||
7239 | deduceOpenCLAddressSpace(NewVD); | ||||
7240 | |||||
7241 | diagnoseOpenCLTypes(S, *this, D, DC, NewVD->getType()); | ||||
7242 | } | ||||
7243 | |||||
7244 | // Handle attributes prior to checking for duplicates in MergeVarDecl | ||||
7245 | ProcessDeclAttributes(S, NewVD, D); | ||||
7246 | |||||
7247 | if (getLangOpts().CUDA || getLangOpts().OpenMPIsDevice || | ||||
7248 | getLangOpts().SYCLIsDevice) { | ||||
7249 | if (EmitTLSUnsupportedError && | ||||
7250 | ((getLangOpts().CUDA && DeclAttrsMatchCUDAMode(getLangOpts(), NewVD)) || | ||||
7251 | (getLangOpts().OpenMPIsDevice && | ||||
7252 | OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(NewVD)))) | ||||
7253 | Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), | ||||
7254 | diag::err_thread_unsupported); | ||||
7255 | |||||
7256 | if (EmitTLSUnsupportedError && | ||||
7257 | (LangOpts.SYCLIsDevice || (LangOpts.OpenMP && LangOpts.OpenMPIsDevice))) | ||||
7258 | targetDiag(D.getIdentifierLoc(), diag::err_thread_unsupported); | ||||
7259 | // CUDA B.2.5: "__shared__ and __constant__ variables have implied static | ||||
7260 | // storage [duration]." | ||||
7261 | if (SC == SC_None && S->getFnParent() != nullptr && | ||||
7262 | (NewVD->hasAttr<CUDASharedAttr>() || | ||||
7263 | NewVD->hasAttr<CUDAConstantAttr>())) { | ||||
7264 | NewVD->setStorageClass(SC_Static); | ||||
7265 | } | ||||
7266 | } | ||||
7267 | |||||
7268 | // Ensure that dllimport globals without explicit storage class are treated as | ||||
7269 | // extern. The storage class is set above using parsed attributes. Now we can | ||||
7270 | // check the VarDecl itself. | ||||
7271 | assert(!NewVD->hasAttr<DLLImportAttr>() ||((!NewVD->hasAttr<DLLImportAttr>() || NewVD->getAttr <DLLImportAttr>()->isInherited() || NewVD->isStaticDataMember () || NewVD->getStorageClass() != SC_None) ? static_cast< void> (0) : __assert_fail ("!NewVD->hasAttr<DLLImportAttr>() || NewVD->getAttr<DLLImportAttr>()->isInherited() || NewVD->isStaticDataMember() || NewVD->getStorageClass() != SC_None" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 7273, __PRETTY_FUNCTION__)) | ||||
7272 | NewVD->getAttr<DLLImportAttr>()->isInherited() ||((!NewVD->hasAttr<DLLImportAttr>() || NewVD->getAttr <DLLImportAttr>()->isInherited() || NewVD->isStaticDataMember () || NewVD->getStorageClass() != SC_None) ? static_cast< void> (0) : __assert_fail ("!NewVD->hasAttr<DLLImportAttr>() || NewVD->getAttr<DLLImportAttr>()->isInherited() || NewVD->isStaticDataMember() || NewVD->getStorageClass() != SC_None" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 7273, __PRETTY_FUNCTION__)) | ||||
7273 | NewVD->isStaticDataMember() || NewVD->getStorageClass() != SC_None)((!NewVD->hasAttr<DLLImportAttr>() || NewVD->getAttr <DLLImportAttr>()->isInherited() || NewVD->isStaticDataMember () || NewVD->getStorageClass() != SC_None) ? static_cast< void> (0) : __assert_fail ("!NewVD->hasAttr<DLLImportAttr>() || NewVD->getAttr<DLLImportAttr>()->isInherited() || NewVD->isStaticDataMember() || NewVD->getStorageClass() != SC_None" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 7273, __PRETTY_FUNCTION__)); | ||||
7274 | |||||
7275 | // In auto-retain/release, infer strong retension for variables of | ||||
7276 | // retainable type. | ||||
7277 | if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) | ||||
7278 | NewVD->setInvalidDecl(); | ||||
7279 | |||||
7280 | // Handle GNU asm-label extension (encoded as an attribute). | ||||
7281 | if (Expr *E = (Expr*)D.getAsmLabel()) { | ||||
7282 | // The parser guarantees this is a string. | ||||
7283 | StringLiteral *SE = cast<StringLiteral>(E); | ||||
7284 | StringRef Label = SE->getString(); | ||||
7285 | if (S->getFnParent() != nullptr) { | ||||
7286 | switch (SC) { | ||||
7287 | case SC_None: | ||||
7288 | case SC_Auto: | ||||
7289 | Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; | ||||
7290 | break; | ||||
7291 | case SC_Register: | ||||
7292 | // Local Named register | ||||
7293 | if (!Context.getTargetInfo().isValidGCCRegisterName(Label) && | ||||
7294 | DeclAttrsMatchCUDAMode(getLangOpts(), getCurFunctionDecl())) | ||||
7295 | Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; | ||||
7296 | break; | ||||
7297 | case SC_Static: | ||||
7298 | case SC_Extern: | ||||
7299 | case SC_PrivateExtern: | ||||
7300 | break; | ||||
7301 | } | ||||
7302 | } else if (SC == SC_Register) { | ||||
7303 | // Global Named register | ||||
7304 | if (DeclAttrsMatchCUDAMode(getLangOpts(), NewVD)) { | ||||
7305 | const auto &TI = Context.getTargetInfo(); | ||||
7306 | bool HasSizeMismatch; | ||||
7307 | |||||
7308 | if (!TI.isValidGCCRegisterName(Label)) | ||||
7309 | Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; | ||||
7310 | else if (!TI.validateGlobalRegisterVariable(Label, | ||||
7311 | Context.getTypeSize(R), | ||||
7312 | HasSizeMismatch)) | ||||
7313 | Diag(E->getExprLoc(), diag::err_asm_invalid_global_var_reg) << Label; | ||||
7314 | else if (HasSizeMismatch) | ||||
7315 | Diag(E->getExprLoc(), diag::err_asm_register_size_mismatch) << Label; | ||||
7316 | } | ||||
7317 | |||||
7318 | if (!R->isIntegralType(Context) && !R->isPointerType()) { | ||||
7319 | Diag(D.getBeginLoc(), diag::err_asm_bad_register_type); | ||||
7320 | NewVD->setInvalidDecl(true); | ||||
7321 | } | ||||
7322 | } | ||||
7323 | |||||
7324 | NewVD->addAttr(AsmLabelAttr::Create(Context, Label, | ||||
7325 | /*IsLiteralLabel=*/true, | ||||
7326 | SE->getStrTokenLoc(0))); | ||||
7327 | } else if (!ExtnameUndeclaredIdentifiers.empty()) { | ||||
7328 | llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = | ||||
7329 | ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier()); | ||||
7330 | if (I != ExtnameUndeclaredIdentifiers.end()) { | ||||
7331 | if (isDeclExternC(NewVD)) { | ||||
7332 | NewVD->addAttr(I->second); | ||||
7333 | ExtnameUndeclaredIdentifiers.erase(I); | ||||
7334 | } else | ||||
7335 | Diag(NewVD->getLocation(), diag::warn_redefine_extname_not_applied) | ||||
7336 | << /*Variable*/1 << NewVD; | ||||
7337 | } | ||||
7338 | } | ||||
7339 | |||||
7340 | // Find the shadowed declaration before filtering for scope. | ||||
7341 | NamedDecl *ShadowedDecl = D.getCXXScopeSpec().isEmpty() | ||||
7342 | ? getShadowedDeclaration(NewVD, Previous) | ||||
7343 | : nullptr; | ||||
7344 | |||||
7345 | // Don't consider existing declarations that are in a different | ||||
7346 | // scope and are out-of-semantic-context declarations (if the new | ||||
7347 | // declaration has linkage). | ||||
7348 | FilterLookupForScope(Previous, OriginalDC, S, shouldConsiderLinkage(NewVD), | ||||
7349 | D.getCXXScopeSpec().isNotEmpty() || | ||||
7350 | IsMemberSpecialization || | ||||
7351 | IsVariableTemplateSpecialization); | ||||
7352 | |||||
7353 | // Check whether the previous declaration is in the same block scope. This | ||||
7354 | // affects whether we merge types with it, per C++11 [dcl.array]p3. | ||||
7355 | if (getLangOpts().CPlusPlus && | ||||
7356 | NewVD->isLocalVarDecl() && NewVD->hasExternalStorage()) | ||||
7357 | NewVD->setPreviousDeclInSameBlockScope( | ||||
7358 | Previous.isSingleResult() && !Previous.isShadowed() && | ||||
7359 | isDeclInScope(Previous.getFoundDecl(), OriginalDC, S, false)); | ||||
7360 | |||||
7361 | if (!getLangOpts().CPlusPlus) { | ||||
7362 | D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); | ||||
7363 | } else { | ||||
7364 | // If this is an explicit specialization of a static data member, check it. | ||||
7365 | if (IsMemberSpecialization && !NewVD->isInvalidDecl() && | ||||
7366 | CheckMemberSpecialization(NewVD, Previous)) | ||||
7367 | NewVD->setInvalidDecl(); | ||||
7368 | |||||
7369 | // Merge the decl with the existing one if appropriate. | ||||
7370 | if (!Previous.empty()) { | ||||
7371 | if (Previous.isSingleResult() && | ||||
7372 | isa<FieldDecl>(Previous.getFoundDecl()) && | ||||
7373 | D.getCXXScopeSpec().isSet()) { | ||||
7374 | // The user tried to define a non-static data member | ||||
7375 | // out-of-line (C++ [dcl.meaning]p1). | ||||
7376 | Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) | ||||
7377 | << D.getCXXScopeSpec().getRange(); | ||||
7378 | Previous.clear(); | ||||
7379 | NewVD->setInvalidDecl(); | ||||
7380 | } | ||||
7381 | } else if (D.getCXXScopeSpec().isSet()) { | ||||
7382 | // No previous declaration in the qualifying scope. | ||||
7383 | Diag(D.getIdentifierLoc(), diag::err_no_member) | ||||
7384 | << Name << computeDeclContext(D.getCXXScopeSpec(), true) | ||||
7385 | << D.getCXXScopeSpec().getRange(); | ||||
7386 | NewVD->setInvalidDecl(); | ||||
7387 | } | ||||
7388 | |||||
7389 | if (!IsVariableTemplateSpecialization) | ||||
7390 | D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); | ||||
7391 | |||||
7392 | if (NewTemplate) { | ||||
7393 | VarTemplateDecl *PrevVarTemplate = | ||||
7394 | NewVD->getPreviousDecl() | ||||
7395 | ? NewVD->getPreviousDecl()->getDescribedVarTemplate() | ||||
7396 | : nullptr; | ||||
7397 | |||||
7398 | // Check the template parameter list of this declaration, possibly | ||||
7399 | // merging in the template parameter list from the previous variable | ||||
7400 | // template declaration. | ||||
7401 | if (CheckTemplateParameterList( | ||||
7402 | TemplateParams, | ||||
7403 | PrevVarTemplate ? PrevVarTemplate->getTemplateParameters() | ||||
7404 | : nullptr, | ||||
7405 | (D.getCXXScopeSpec().isSet() && DC && DC->isRecord() && | ||||
7406 | DC->isDependentContext()) | ||||
7407 | ? TPC_ClassTemplateMember | ||||
7408 | : TPC_VarTemplate)) | ||||
7409 | NewVD->setInvalidDecl(); | ||||
7410 | |||||
7411 | // If we are providing an explicit specialization of a static variable | ||||
7412 | // template, make a note of that. | ||||
7413 | if (PrevVarTemplate && | ||||
7414 | PrevVarTemplate->getInstantiatedFromMemberTemplate()) | ||||
7415 | PrevVarTemplate->setMemberSpecialization(); | ||||
7416 | } | ||||
7417 | } | ||||
7418 | |||||
7419 | // Diagnose shadowed variables iff this isn't a redeclaration. | ||||
7420 | if (ShadowedDecl && !D.isRedeclaration()) | ||||
7421 | CheckShadow(NewVD, ShadowedDecl, Previous); | ||||
7422 | |||||
7423 | ProcessPragmaWeak(S, NewVD); | ||||
7424 | |||||
7425 | // If this is the first declaration of an extern C variable, update | ||||
7426 | // the map of such variables. | ||||
7427 | if (NewVD->isFirstDecl() && !NewVD->isInvalidDecl() && | ||||
7428 | isIncompleteDeclExternC(*this, NewVD)) | ||||
7429 | RegisterLocallyScopedExternCDecl(NewVD, S); | ||||
7430 | |||||
7431 | if (getLangOpts().CPlusPlus && NewVD->isStaticLocal()) { | ||||
7432 | MangleNumberingContext *MCtx; | ||||
7433 | Decl *ManglingContextDecl; | ||||
7434 | std::tie(MCtx, ManglingContextDecl) = | ||||
7435 | getCurrentMangleNumberContext(NewVD->getDeclContext()); | ||||
7436 | if (MCtx) { | ||||
7437 | Context.setManglingNumber( | ||||
7438 | NewVD, MCtx->getManglingNumber( | ||||
7439 | NewVD, getMSManglingNumber(getLangOpts(), S))); | ||||
7440 | Context.setStaticLocalNumber(NewVD, MCtx->getStaticLocalNumber(NewVD)); | ||||
7441 | } | ||||
7442 | } | ||||
7443 | |||||
7444 | // Special handling of variable named 'main'. | ||||
7445 | if (Name.getAsIdentifierInfo() && Name.getAsIdentifierInfo()->isStr("main") && | ||||
7446 | NewVD->getDeclContext()->getRedeclContext()->isTranslationUnit() && | ||||
7447 | !getLangOpts().Freestanding && !NewVD->getDescribedVarTemplate()) { | ||||
7448 | |||||
7449 | // C++ [basic.start.main]p3 | ||||
7450 | // A program that declares a variable main at global scope is ill-formed. | ||||
7451 | if (getLangOpts().CPlusPlus) | ||||
7452 | Diag(D.getBeginLoc(), diag::err_main_global_variable); | ||||
7453 | |||||
7454 | // In C, and external-linkage variable named main results in undefined | ||||
7455 | // behavior. | ||||
7456 | else if (NewVD->hasExternalFormalLinkage()) | ||||
7457 | Diag(D.getBeginLoc(), diag::warn_main_redefined); | ||||
7458 | } | ||||
7459 | |||||
7460 | if (D.isRedeclaration() && !Previous.empty()) { | ||||
7461 | NamedDecl *Prev = Previous.getRepresentativeDecl(); | ||||
7462 | checkDLLAttributeRedeclaration(*this, Prev, NewVD, IsMemberSpecialization, | ||||
7463 | D.isFunctionDefinition()); | ||||
7464 | } | ||||
7465 | |||||
7466 | if (NewTemplate) { | ||||
7467 | if (NewVD->isInvalidDecl()) | ||||
7468 | NewTemplate->setInvalidDecl(); | ||||
7469 | ActOnDocumentableDecl(NewTemplate); | ||||
7470 | return NewTemplate; | ||||
7471 | } | ||||
7472 | |||||
7473 | if (IsMemberSpecialization && !NewVD->isInvalidDecl()) | ||||
7474 | CompleteMemberSpecialization(NewVD, Previous); | ||||
7475 | |||||
7476 | return NewVD; | ||||
7477 | } | ||||
7478 | |||||
7479 | /// Enum describing the %select options in diag::warn_decl_shadow. | ||||
7480 | enum ShadowedDeclKind { | ||||
7481 | SDK_Local, | ||||
7482 | SDK_Global, | ||||
7483 | SDK_StaticMember, | ||||
7484 | SDK_Field, | ||||
7485 | SDK_Typedef, | ||||
7486 | SDK_Using | ||||
7487 | }; | ||||
7488 | |||||
7489 | /// Determine what kind of declaration we're shadowing. | ||||
7490 | static ShadowedDeclKind computeShadowedDeclKind(const NamedDecl *ShadowedDecl, | ||||
7491 | const DeclContext *OldDC) { | ||||
7492 | if (isa<TypeAliasDecl>(ShadowedDecl)) | ||||
7493 | return SDK_Using; | ||||
7494 | else if (isa<TypedefDecl>(ShadowedDecl)) | ||||
7495 | return SDK_Typedef; | ||||
7496 | else if (isa<RecordDecl>(OldDC)) | ||||
7497 | return isa<FieldDecl>(ShadowedDecl) ? SDK_Field : SDK_StaticMember; | ||||
7498 | |||||
7499 | return OldDC->isFileContext() ? SDK_Global : SDK_Local; | ||||
7500 | } | ||||
7501 | |||||
7502 | /// Return the location of the capture if the given lambda captures the given | ||||
7503 | /// variable \p VD, or an invalid source location otherwise. | ||||
7504 | static SourceLocation getCaptureLocation(const LambdaScopeInfo *LSI, | ||||
7505 | const VarDecl *VD) { | ||||
7506 | for (const Capture &Capture : LSI->Captures) { | ||||
7507 | if (Capture.isVariableCapture() && Capture.getVariable() == VD) | ||||
7508 | return Capture.getLocation(); | ||||
7509 | } | ||||
7510 | return SourceLocation(); | ||||
7511 | } | ||||
7512 | |||||
7513 | static bool shouldWarnIfShadowedDecl(const DiagnosticsEngine &Diags, | ||||
7514 | const LookupResult &R) { | ||||
7515 | // Only diagnose if we're shadowing an unambiguous field or variable. | ||||
7516 | if (R.getResultKind() != LookupResult::Found) | ||||
7517 | return false; | ||||
7518 | |||||
7519 | // Return false if warning is ignored. | ||||
7520 | return !Diags.isIgnored(diag::warn_decl_shadow, R.getNameLoc()); | ||||
7521 | } | ||||
7522 | |||||
7523 | /// Return the declaration shadowed by the given variable \p D, or null | ||||
7524 | /// if it doesn't shadow any declaration or shadowing warnings are disabled. | ||||
7525 | NamedDecl *Sema::getShadowedDeclaration(const VarDecl *D, | ||||
7526 | const LookupResult &R) { | ||||
7527 | if (!shouldWarnIfShadowedDecl(Diags, R)) | ||||
7528 | return nullptr; | ||||
7529 | |||||
7530 | // Don't diagnose declarations at file scope. | ||||
7531 | if (D->hasGlobalStorage()) | ||||
7532 | return nullptr; | ||||
7533 | |||||
7534 | NamedDecl *ShadowedDecl = R.getFoundDecl(); | ||||
7535 | return isa<VarDecl>(ShadowedDecl) || isa<FieldDecl>(ShadowedDecl) | ||||
7536 | ? ShadowedDecl | ||||
7537 | : nullptr; | ||||
7538 | } | ||||
7539 | |||||
7540 | /// Return the declaration shadowed by the given typedef \p D, or null | ||||
7541 | /// if it doesn't shadow any declaration or shadowing warnings are disabled. | ||||
7542 | NamedDecl *Sema::getShadowedDeclaration(const TypedefNameDecl *D, | ||||
7543 | const LookupResult &R) { | ||||
7544 | // Don't warn if typedef declaration is part of a class | ||||
7545 | if (D->getDeclContext()->isRecord()) | ||||
7546 | return nullptr; | ||||
7547 | |||||
7548 | if (!shouldWarnIfShadowedDecl(Diags, R)) | ||||
7549 | return nullptr; | ||||
7550 | |||||
7551 | NamedDecl *ShadowedDecl = R.getFoundDecl(); | ||||
7552 | return isa<TypedefNameDecl>(ShadowedDecl) ? ShadowedDecl : nullptr; | ||||
7553 | } | ||||
7554 | |||||
7555 | /// Diagnose variable or built-in function shadowing. Implements | ||||
7556 | /// -Wshadow. | ||||
7557 | /// | ||||
7558 | /// This method is called whenever a VarDecl is added to a "useful" | ||||
7559 | /// scope. | ||||
7560 | /// | ||||
7561 | /// \param ShadowedDecl the declaration that is shadowed by the given variable | ||||
7562 | /// \param R the lookup of the name | ||||
7563 | /// | ||||
7564 | void Sema::CheckShadow(NamedDecl *D, NamedDecl *ShadowedDecl, | ||||
7565 | const LookupResult &R) { | ||||
7566 | DeclContext *NewDC = D->getDeclContext(); | ||||
7567 | |||||
7568 | if (FieldDecl *FD = dyn_cast<FieldDecl>(ShadowedDecl)) { | ||||
7569 | // Fields are not shadowed by variables in C++ static methods. | ||||
7570 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) | ||||
7571 | if (MD->isStatic()) | ||||
7572 | return; | ||||
7573 | |||||
7574 | // Fields shadowed by constructor parameters are a special case. Usually | ||||
7575 | // the constructor initializes the field with the parameter. | ||||
7576 | if (isa<CXXConstructorDecl>(NewDC)) | ||||
7577 | if (const auto PVD = dyn_cast<ParmVarDecl>(D)) { | ||||
7578 | // Remember that this was shadowed so we can either warn about its | ||||
7579 | // modification or its existence depending on warning settings. | ||||
7580 | ShadowingDecls.insert({PVD->getCanonicalDecl(), FD}); | ||||
7581 | return; | ||||
7582 | } | ||||
7583 | } | ||||
7584 | |||||
7585 | if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) | ||||
7586 | if (shadowedVar->isExternC()) { | ||||
7587 | // For shadowing external vars, make sure that we point to the global | ||||
7588 | // declaration, not a locally scoped extern declaration. | ||||
7589 | for (auto I : shadowedVar->redecls()) | ||||
7590 | if (I->isFileVarDecl()) { | ||||
7591 | ShadowedDecl = I; | ||||
7592 | break; | ||||
7593 | } | ||||
7594 | } | ||||
7595 | |||||
7596 | DeclContext *OldDC = ShadowedDecl->getDeclContext()->getRedeclContext(); | ||||
7597 | |||||
7598 | unsigned WarningDiag = diag::warn_decl_shadow; | ||||
7599 | SourceLocation CaptureLoc; | ||||
7600 | if (isa<VarDecl>(D) && isa<VarDecl>(ShadowedDecl) && NewDC && | ||||
7601 | isa<CXXMethodDecl>(NewDC)) { | ||||
7602 | if (const auto *RD = dyn_cast<CXXRecordDecl>(NewDC->getParent())) { | ||||
7603 | if (RD->isLambda() && OldDC->Encloses(NewDC->getLexicalParent())) { | ||||
7604 | if (RD->getLambdaCaptureDefault() == LCD_None) { | ||||
7605 | // Try to avoid warnings for lambdas with an explicit capture list. | ||||
7606 | const auto *LSI = cast<LambdaScopeInfo>(getCurFunction()); | ||||
7607 | // Warn only when the lambda captures the shadowed decl explicitly. | ||||
7608 | CaptureLoc = getCaptureLocation(LSI, cast<VarDecl>(ShadowedDecl)); | ||||
7609 | if (CaptureLoc.isInvalid()) | ||||
7610 | WarningDiag = diag::warn_decl_shadow_uncaptured_local; | ||||
7611 | } else { | ||||
7612 | // Remember that this was shadowed so we can avoid the warning if the | ||||
7613 | // shadowed decl isn't captured and the warning settings allow it. | ||||
7614 | cast<LambdaScopeInfo>(getCurFunction()) | ||||
7615 | ->ShadowingDecls.push_back( | ||||
7616 | {cast<VarDecl>(D), cast<VarDecl>(ShadowedDecl)}); | ||||
7617 | return; | ||||
7618 | } | ||||
7619 | } | ||||
7620 | |||||
7621 | if (cast<VarDecl>(ShadowedDecl)->hasLocalStorage()) { | ||||
7622 | // A variable can't shadow a local variable in an enclosing scope, if | ||||
7623 | // they are separated by a non-capturing declaration context. | ||||
7624 | for (DeclContext *ParentDC = NewDC; | ||||
7625 | ParentDC && !ParentDC->Equals(OldDC); | ||||
7626 | ParentDC = getLambdaAwareParentOfDeclContext(ParentDC)) { | ||||
7627 | // Only block literals, captured statements, and lambda expressions | ||||
7628 | // can capture; other scopes don't. | ||||
7629 | if (!isa<BlockDecl>(ParentDC) && !isa<CapturedDecl>(ParentDC) && | ||||
7630 | !isLambdaCallOperator(ParentDC)) { | ||||
7631 | return; | ||||
7632 | } | ||||
7633 | } | ||||
7634 | } | ||||
7635 | } | ||||
7636 | } | ||||
7637 | |||||
7638 | // Only warn about certain kinds of shadowing for class members. | ||||
7639 | if (NewDC && NewDC->isRecord()) { | ||||
7640 | // In particular, don't warn about shadowing non-class members. | ||||
7641 | if (!OldDC->isRecord()) | ||||
7642 | return; | ||||
7643 | |||||
7644 | // TODO: should we warn about static data members shadowing | ||||
7645 | // static data members from base classes? | ||||
7646 | |||||
7647 | // TODO: don't diagnose for inaccessible shadowed members. | ||||
7648 | // This is hard to do perfectly because we might friend the | ||||
7649 | // shadowing context, but that's just a false negative. | ||||
7650 | } | ||||
7651 | |||||
7652 | |||||
7653 | DeclarationName Name = R.getLookupName(); | ||||
7654 | |||||
7655 | // Emit warning and note. | ||||
7656 | if (getSourceManager().isInSystemMacro(R.getNameLoc())) | ||||
7657 | return; | ||||
7658 | ShadowedDeclKind Kind = computeShadowedDeclKind(ShadowedDecl, OldDC); | ||||
7659 | Diag(R.getNameLoc(), WarningDiag) << Name << Kind << OldDC; | ||||
7660 | if (!CaptureLoc.isInvalid()) | ||||
7661 | Diag(CaptureLoc, diag::note_var_explicitly_captured_here) | ||||
7662 | << Name << /*explicitly*/ 1; | ||||
7663 | Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); | ||||
7664 | } | ||||
7665 | |||||
7666 | /// Diagnose shadowing for variables shadowed in the lambda record \p LambdaRD | ||||
7667 | /// when these variables are captured by the lambda. | ||||
7668 | void Sema::DiagnoseShadowingLambdaDecls(const LambdaScopeInfo *LSI) { | ||||
7669 | for (const auto &Shadow : LSI->ShadowingDecls) { | ||||
7670 | const VarDecl *ShadowedDecl = Shadow.ShadowedDecl; | ||||
7671 | // Try to avoid the warning when the shadowed decl isn't captured. | ||||
7672 | SourceLocation CaptureLoc = getCaptureLocation(LSI, ShadowedDecl); | ||||
7673 | const DeclContext *OldDC = ShadowedDecl->getDeclContext(); | ||||
7674 | Diag(Shadow.VD->getLocation(), CaptureLoc.isInvalid() | ||||
7675 | ? diag::warn_decl_shadow_uncaptured_local | ||||
7676 | : diag::warn_decl_shadow) | ||||
7677 | << Shadow.VD->getDeclName() | ||||
7678 | << computeShadowedDeclKind(ShadowedDecl, OldDC) << OldDC; | ||||
7679 | if (!CaptureLoc.isInvalid()) | ||||
7680 | Diag(CaptureLoc, diag::note_var_explicitly_captured_here) | ||||
7681 | << Shadow.VD->getDeclName() << /*explicitly*/ 0; | ||||
7682 | Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); | ||||
7683 | } | ||||
7684 | } | ||||
7685 | |||||
7686 | /// Check -Wshadow without the advantage of a previous lookup. | ||||
7687 | void Sema::CheckShadow(Scope *S, VarDecl *D) { | ||||
7688 | if (Diags.isIgnored(diag::warn_decl_shadow, D->getLocation())) | ||||
7689 | return; | ||||
7690 | |||||
7691 | LookupResult R(*this, D->getDeclName(), D->getLocation(), | ||||
7692 | Sema::LookupOrdinaryName, Sema::ForVisibleRedeclaration); | ||||
7693 | LookupName(R, S); | ||||
7694 | if (NamedDecl *ShadowedDecl = getShadowedDeclaration(D, R)) | ||||
7695 | CheckShadow(D, ShadowedDecl, R); | ||||
7696 | } | ||||
7697 | |||||
7698 | /// Check if 'E', which is an expression that is about to be modified, refers | ||||
7699 | /// to a constructor parameter that shadows a field. | ||||
7700 | void Sema::CheckShadowingDeclModification(Expr *E, SourceLocation Loc) { | ||||
7701 | // Quickly ignore expressions that can't be shadowing ctor parameters. | ||||
7702 | if (!getLangOpts().CPlusPlus || ShadowingDecls.empty()) | ||||
7703 | return; | ||||
7704 | E = E->IgnoreParenImpCasts(); | ||||
7705 | auto *DRE = dyn_cast<DeclRefExpr>(E); | ||||
7706 | if (!DRE) | ||||
7707 | return; | ||||
7708 | const NamedDecl *D = cast<NamedDecl>(DRE->getDecl()->getCanonicalDecl()); | ||||
7709 | auto I = ShadowingDecls.find(D); | ||||
7710 | if (I == ShadowingDecls.end()) | ||||
7711 | return; | ||||
7712 | const NamedDecl *ShadowedDecl = I->second; | ||||
7713 | const DeclContext *OldDC = ShadowedDecl->getDeclContext(); | ||||
7714 | Diag(Loc, diag::warn_modifying_shadowing_decl) << D << OldDC; | ||||
7715 | Diag(D->getLocation(), diag::note_var_declared_here) << D; | ||||
7716 | Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); | ||||
7717 | |||||
7718 | // Avoid issuing multiple warnings about the same decl. | ||||
7719 | ShadowingDecls.erase(I); | ||||
7720 | } | ||||
7721 | |||||
7722 | /// Check for conflict between this global or extern "C" declaration and | ||||
7723 | /// previous global or extern "C" declarations. This is only used in C++. | ||||
7724 | template<typename T> | ||||
7725 | static bool checkGlobalOrExternCConflict( | ||||
7726 | Sema &S, const T *ND, bool IsGlobal, LookupResult &Previous) { | ||||
7727 | assert(S.getLangOpts().CPlusPlus && "only C++ has extern \"C\"")((S.getLangOpts().CPlusPlus && "only C++ has extern \"C\"" ) ? static_cast<void> (0) : __assert_fail ("S.getLangOpts().CPlusPlus && \"only C++ has extern \\\"C\\\"\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 7727, __PRETTY_FUNCTION__)); | ||||
7728 | NamedDecl *Prev = S.findLocallyScopedExternCDecl(ND->getDeclName()); | ||||
7729 | |||||
7730 | if (!Prev && IsGlobal && !isIncompleteDeclExternC(S, ND)) { | ||||
7731 | // The common case: this global doesn't conflict with any extern "C" | ||||
7732 | // declaration. | ||||
7733 | return false; | ||||
7734 | } | ||||
7735 | |||||
7736 | if (Prev) { | ||||
7737 | if (!IsGlobal || isIncompleteDeclExternC(S, ND)) { | ||||
7738 | // Both the old and new declarations have C language linkage. This is a | ||||
7739 | // redeclaration. | ||||
7740 | Previous.clear(); | ||||
7741 | Previous.addDecl(Prev); | ||||
7742 | return true; | ||||
7743 | } | ||||
7744 | |||||
7745 | // This is a global, non-extern "C" declaration, and there is a previous | ||||
7746 | // non-global extern "C" declaration. Diagnose if this is a variable | ||||
7747 | // declaration. | ||||
7748 | if (!isa<VarDecl>(ND)) | ||||
7749 | return false; | ||||
7750 | } else { | ||||
7751 | // The declaration is extern "C". Check for any declaration in the | ||||
7752 | // translation unit which might conflict. | ||||
7753 | if (IsGlobal) { | ||||
7754 | // We have already performed the lookup into the translation unit. | ||||
7755 | IsGlobal = false; | ||||
7756 | for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); | ||||
7757 | I != E; ++I) { | ||||
7758 | if (isa<VarDecl>(*I)) { | ||||
7759 | Prev = *I; | ||||
7760 | break; | ||||
7761 | } | ||||
7762 | } | ||||
7763 | } else { | ||||
7764 | DeclContext::lookup_result R = | ||||
7765 | S.Context.getTranslationUnitDecl()->lookup(ND->getDeclName()); | ||||
7766 | for (DeclContext::lookup_result::iterator I = R.begin(), E = R.end(); | ||||
7767 | I != E; ++I) { | ||||
7768 | if (isa<VarDecl>(*I)) { | ||||
7769 | Prev = *I; | ||||
7770 | break; | ||||
7771 | } | ||||
7772 | // FIXME: If we have any other entity with this name in global scope, | ||||
7773 | // the declaration is ill-formed, but that is a defect: it breaks the | ||||
7774 | // 'stat' hack, for instance. Only variables can have mangled name | ||||
7775 | // clashes with extern "C" declarations, so only they deserve a | ||||
7776 | // diagnostic. | ||||
7777 | } | ||||
7778 | } | ||||
7779 | |||||
7780 | if (!Prev) | ||||
7781 | return false; | ||||
7782 | } | ||||
7783 | |||||
7784 | // Use the first declaration's location to ensure we point at something which | ||||
7785 | // is lexically inside an extern "C" linkage-spec. | ||||
7786 | assert(Prev && "should have found a previous declaration to diagnose")((Prev && "should have found a previous declaration to diagnose" ) ? static_cast<void> (0) : __assert_fail ("Prev && \"should have found a previous declaration to diagnose\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 7786, __PRETTY_FUNCTION__)); | ||||
7787 | if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Prev)) | ||||
7788 | Prev = FD->getFirstDecl(); | ||||
7789 | else | ||||
7790 | Prev = cast<VarDecl>(Prev)->getFirstDecl(); | ||||
7791 | |||||
7792 | S.Diag(ND->getLocation(), diag::err_extern_c_global_conflict) | ||||
7793 | << IsGlobal << ND; | ||||
7794 | S.Diag(Prev->getLocation(), diag::note_extern_c_global_conflict) | ||||
7795 | << IsGlobal; | ||||
7796 | return false; | ||||
7797 | } | ||||
7798 | |||||
7799 | /// Apply special rules for handling extern "C" declarations. Returns \c true | ||||
7800 | /// if we have found that this is a redeclaration of some prior entity. | ||||
7801 | /// | ||||
7802 | /// Per C++ [dcl.link]p6: | ||||
7803 | /// Two declarations [for a function or variable] with C language linkage | ||||
7804 | /// with the same name that appear in different scopes refer to the same | ||||
7805 | /// [entity]. An entity with C language linkage shall not be declared with | ||||
7806 | /// the same name as an entity in global scope. | ||||
7807 | template<typename T> | ||||
7808 | static bool checkForConflictWithNonVisibleExternC(Sema &S, const T *ND, | ||||
7809 | LookupResult &Previous) { | ||||
7810 | if (!S.getLangOpts().CPlusPlus) { | ||||
7811 | // In C, when declaring a global variable, look for a corresponding 'extern' | ||||
7812 | // variable declared in function scope. We don't need this in C++, because | ||||
7813 | // we find local extern decls in the surrounding file-scope DeclContext. | ||||
7814 | if (ND->getDeclContext()->getRedeclContext()->isTranslationUnit()) { | ||||
7815 | if (NamedDecl *Prev = S.findLocallyScopedExternCDecl(ND->getDeclName())) { | ||||
7816 | Previous.clear(); | ||||
7817 | Previous.addDecl(Prev); | ||||
7818 | return true; | ||||
7819 | } | ||||
7820 | } | ||||
7821 | return false; | ||||
7822 | } | ||||
7823 | |||||
7824 | // A declaration in the translation unit can conflict with an extern "C" | ||||
7825 | // declaration. | ||||
7826 | if (ND->getDeclContext()->getRedeclContext()->isTranslationUnit()) | ||||
7827 | return checkGlobalOrExternCConflict(S, ND, /*IsGlobal*/true, Previous); | ||||
7828 | |||||
7829 | // An extern "C" declaration can conflict with a declaration in the | ||||
7830 | // translation unit or can be a redeclaration of an extern "C" declaration | ||||
7831 | // in another scope. | ||||
7832 | if (isIncompleteDeclExternC(S,ND)) | ||||
7833 | return checkGlobalOrExternCConflict(S, ND, /*IsGlobal*/false, Previous); | ||||
7834 | |||||
7835 | // Neither global nor extern "C": nothing to do. | ||||
7836 | return false; | ||||
7837 | } | ||||
7838 | |||||
7839 | void Sema::CheckVariableDeclarationType(VarDecl *NewVD) { | ||||
7840 | // If the decl is already known invalid, don't check it. | ||||
7841 | if (NewVD->isInvalidDecl()) | ||||
7842 | return; | ||||
7843 | |||||
7844 | QualType T = NewVD->getType(); | ||||
7845 | |||||
7846 | // Defer checking an 'auto' type until its initializer is attached. | ||||
7847 | if (T->isUndeducedType()) | ||||
7848 | return; | ||||
7849 | |||||
7850 | if (NewVD->hasAttrs()) | ||||
7851 | CheckAlignasUnderalignment(NewVD); | ||||
7852 | |||||
7853 | if (T->isObjCObjectType()) { | ||||
7854 | Diag(NewVD->getLocation(), diag::err_statically_allocated_object) | ||||
7855 | << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); | ||||
7856 | T = Context.getObjCObjectPointerType(T); | ||||
7857 | NewVD->setType(T); | ||||
7858 | } | ||||
7859 | |||||
7860 | // Emit an error if an address space was applied to decl with local storage. | ||||
7861 | // This includes arrays of objects with address space qualifiers, but not | ||||
7862 | // automatic variables that point to other address spaces. | ||||
7863 | // ISO/IEC TR 18037 S5.1.2 | ||||
7864 | if (!getLangOpts().OpenCL && NewVD->hasLocalStorage() && | ||||
7865 | T.getAddressSpace() != LangAS::Default) { | ||||
7866 | Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl) << 0; | ||||
7867 | NewVD->setInvalidDecl(); | ||||
7868 | return; | ||||
7869 | } | ||||
7870 | |||||
7871 | // OpenCL v1.2 s6.8 - The static qualifier is valid only in program | ||||
7872 | // scope. | ||||
7873 | if (getLangOpts().OpenCLVersion == 120 && | ||||
7874 | !getOpenCLOptions().isEnabled("cl_clang_storage_class_specifiers") && | ||||
7875 | NewVD->isStaticLocal()) { | ||||
7876 | Diag(NewVD->getLocation(), diag::err_static_function_scope); | ||||
7877 | NewVD->setInvalidDecl(); | ||||
7878 | return; | ||||
7879 | } | ||||
7880 | |||||
7881 | if (getLangOpts().OpenCL) { | ||||
7882 | // OpenCL v2.0 s6.12.5 - The __block storage type is not supported. | ||||
7883 | if (NewVD->hasAttr<BlocksAttr>()) { | ||||
7884 | Diag(NewVD->getLocation(), diag::err_opencl_block_storage_type); | ||||
7885 | return; | ||||
7886 | } | ||||
7887 | |||||
7888 | if (T->isBlockPointerType()) { | ||||
7889 | // OpenCL v2.0 s6.12.5 - Any block declaration must be const qualified and | ||||
7890 | // can't use 'extern' storage class. | ||||
7891 | if (!T.isConstQualified()) { | ||||
7892 | Diag(NewVD->getLocation(), diag::err_opencl_invalid_block_declaration) | ||||
7893 | << 0 /*const*/; | ||||
7894 | NewVD->setInvalidDecl(); | ||||
7895 | return; | ||||
7896 | } | ||||
7897 | if (NewVD->hasExternalStorage()) { | ||||
7898 | Diag(NewVD->getLocation(), diag::err_opencl_extern_block_declaration); | ||||
7899 | NewVD->setInvalidDecl(); | ||||
7900 | return; | ||||
7901 | } | ||||
7902 | } | ||||
7903 | // OpenCL C v1.2 s6.5 - All program scope variables must be declared in the | ||||
7904 | // __constant address space. | ||||
7905 | // OpenCL C v2.0 s6.5.1 - Variables defined at program scope and static | ||||
7906 | // variables inside a function can also be declared in the global | ||||
7907 | // address space. | ||||
7908 | // C++ for OpenCL inherits rule from OpenCL C v2.0. | ||||
7909 | // FIXME: Adding local AS in C++ for OpenCL might make sense. | ||||
7910 | if (NewVD->isFileVarDecl() || NewVD->isStaticLocal() || | ||||
7911 | NewVD->hasExternalStorage()) { | ||||
7912 | if (!T->isSamplerT() && | ||||
7913 | !T->isDependentType() && | ||||
7914 | !(T.getAddressSpace() == LangAS::opencl_constant || | ||||
7915 | (T.getAddressSpace() == LangAS::opencl_global && | ||||
7916 | (getLangOpts().OpenCLVersion == 200 || | ||||
7917 | getLangOpts().OpenCLCPlusPlus)))) { | ||||
7918 | int Scope = NewVD->isStaticLocal() | NewVD->hasExternalStorage() << 1; | ||||
7919 | if (getLangOpts().OpenCLVersion == 200 || getLangOpts().OpenCLCPlusPlus) | ||||
7920 | Diag(NewVD->getLocation(), diag::err_opencl_global_invalid_addr_space) | ||||
7921 | << Scope << "global or constant"; | ||||
7922 | else | ||||
7923 | Diag(NewVD->getLocation(), diag::err_opencl_global_invalid_addr_space) | ||||
7924 | << Scope << "constant"; | ||||
7925 | NewVD->setInvalidDecl(); | ||||
7926 | return; | ||||
7927 | } | ||||
7928 | } else { | ||||
7929 | if (T.getAddressSpace() == LangAS::opencl_global) { | ||||
7930 | Diag(NewVD->getLocation(), diag::err_opencl_function_variable) | ||||
7931 | << 1 /*is any function*/ << "global"; | ||||
7932 | NewVD->setInvalidDecl(); | ||||
7933 | return; | ||||
7934 | } | ||||
7935 | if (T.getAddressSpace() == LangAS::opencl_constant || | ||||
7936 | T.getAddressSpace() == LangAS::opencl_local) { | ||||
7937 | FunctionDecl *FD = getCurFunctionDecl(); | ||||
7938 | // OpenCL v1.1 s6.5.2 and s6.5.3: no local or constant variables | ||||
7939 | // in functions. | ||||
7940 | if (FD && !FD->hasAttr<OpenCLKernelAttr>()) { | ||||
7941 | if (T.getAddressSpace() == LangAS::opencl_constant) | ||||
7942 | Diag(NewVD->getLocation(), diag::err_opencl_function_variable) | ||||
7943 | << 0 /*non-kernel only*/ << "constant"; | ||||
7944 | else | ||||
7945 | Diag(NewVD->getLocation(), diag::err_opencl_function_variable) | ||||
7946 | << 0 /*non-kernel only*/ << "local"; | ||||
7947 | NewVD->setInvalidDecl(); | ||||
7948 | return; | ||||
7949 | } | ||||
7950 | // OpenCL v2.0 s6.5.2 and s6.5.3: local and constant variables must be | ||||
7951 | // in the outermost scope of a kernel function. | ||||
7952 | if (FD && FD->hasAttr<OpenCLKernelAttr>()) { | ||||
7953 | if (!getCurScope()->isFunctionScope()) { | ||||
7954 | if (T.getAddressSpace() == LangAS::opencl_constant) | ||||
7955 | Diag(NewVD->getLocation(), diag::err_opencl_addrspace_scope) | ||||
7956 | << "constant"; | ||||
7957 | else | ||||
7958 | Diag(NewVD->getLocation(), diag::err_opencl_addrspace_scope) | ||||
7959 | << "local"; | ||||
7960 | NewVD->setInvalidDecl(); | ||||
7961 | return; | ||||
7962 | } | ||||
7963 | } | ||||
7964 | } else if (T.getAddressSpace() != LangAS::opencl_private && | ||||
7965 | // If we are parsing a template we didn't deduce an addr | ||||
7966 | // space yet. | ||||
7967 | T.getAddressSpace() != LangAS::Default) { | ||||
7968 | // Do not allow other address spaces on automatic variable. | ||||
7969 | Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl) << 1; | ||||
7970 | NewVD->setInvalidDecl(); | ||||
7971 | return; | ||||
7972 | } | ||||
7973 | } | ||||
7974 | } | ||||
7975 | |||||
7976 | if (NewVD->hasLocalStorage() && T.isObjCGCWeak() | ||||
7977 | && !NewVD->hasAttr<BlocksAttr>()) { | ||||
7978 | if (getLangOpts().getGC() != LangOptions::NonGC) | ||||
7979 | Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); | ||||
7980 | else { | ||||
7981 | assert(!getLangOpts().ObjCAutoRefCount)((!getLangOpts().ObjCAutoRefCount) ? static_cast<void> ( 0) : __assert_fail ("!getLangOpts().ObjCAutoRefCount", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 7981, __PRETTY_FUNCTION__)); | ||||
7982 | Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); | ||||
7983 | } | ||||
7984 | } | ||||
7985 | |||||
7986 | bool isVM = T->isVariablyModifiedType(); | ||||
7987 | if (isVM || NewVD->hasAttr<CleanupAttr>() || | ||||
7988 | NewVD->hasAttr<BlocksAttr>()) | ||||
7989 | setFunctionHasBranchProtectedScope(); | ||||
7990 | |||||
7991 | if ((isVM && NewVD->hasLinkage()) || | ||||
7992 | (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { | ||||
7993 | bool SizeIsNegative; | ||||
7994 | llvm::APSInt Oversized; | ||||
7995 | TypeSourceInfo *FixedTInfo = TryToFixInvalidVariablyModifiedTypeSourceInfo( | ||||
7996 | NewVD->getTypeSourceInfo(), Context, SizeIsNegative, Oversized); | ||||
7997 | QualType FixedT; | ||||
7998 | if (FixedTInfo && T == NewVD->getTypeSourceInfo()->getType()) | ||||
7999 | FixedT = FixedTInfo->getType(); | ||||
8000 | else if (FixedTInfo) { | ||||
8001 | // Type and type-as-written are canonically different. We need to fix up | ||||
8002 | // both types separately. | ||||
8003 | FixedT = TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, | ||||
8004 | Oversized); | ||||
8005 | } | ||||
8006 | if ((!FixedTInfo || FixedT.isNull()) && T->isVariableArrayType()) { | ||||
8007 | const VariableArrayType *VAT = Context.getAsVariableArrayType(T); | ||||
8008 | // FIXME: This won't give the correct result for | ||||
8009 | // int a[10][n]; | ||||
8010 | SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); | ||||
8011 | |||||
8012 | if (NewVD->isFileVarDecl()) | ||||
8013 | Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) | ||||
8014 | << SizeRange; | ||||
8015 | else if (NewVD->isStaticLocal()) | ||||
8016 | Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) | ||||
8017 | << SizeRange; | ||||
8018 | else | ||||
8019 | Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) | ||||
8020 | << SizeRange; | ||||
8021 | NewVD->setInvalidDecl(); | ||||
8022 | return; | ||||
8023 | } | ||||
8024 | |||||
8025 | if (!FixedTInfo) { | ||||
8026 | if (NewVD->isFileVarDecl()) | ||||
8027 | Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); | ||||
8028 | else | ||||
8029 | Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); | ||||
8030 | NewVD->setInvalidDecl(); | ||||
8031 | return; | ||||
8032 | } | ||||
8033 | |||||
8034 | Diag(NewVD->getLocation(), diag::ext_vla_folded_to_constant); | ||||
8035 | NewVD->setType(FixedT); | ||||
8036 | NewVD->setTypeSourceInfo(FixedTInfo); | ||||
8037 | } | ||||
8038 | |||||
8039 | if (T->isVoidType()) { | ||||
8040 | // C++98 [dcl.stc]p5: The extern specifier can be applied only to the names | ||||
8041 | // of objects and functions. | ||||
8042 | if (NewVD->isThisDeclarationADefinition() || getLangOpts().CPlusPlus) { | ||||
8043 | Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) | ||||
8044 | << T; | ||||
8045 | NewVD->setInvalidDecl(); | ||||
8046 | return; | ||||
8047 | } | ||||
8048 | } | ||||
8049 | |||||
8050 | if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { | ||||
8051 | Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); | ||||
8052 | NewVD->setInvalidDecl(); | ||||
8053 | return; | ||||
8054 | } | ||||
8055 | |||||
8056 | if (!NewVD->hasLocalStorage() && T->isSizelessType()) { | ||||
8057 | Diag(NewVD->getLocation(), diag::err_sizeless_nonlocal) << T; | ||||
8058 | NewVD->setInvalidDecl(); | ||||
8059 | return; | ||||
8060 | } | ||||
8061 | |||||
8062 | if (isVM && NewVD->hasAttr<BlocksAttr>()) { | ||||
8063 | Diag(NewVD->getLocation(), diag::err_block_on_vm); | ||||
8064 | NewVD->setInvalidDecl(); | ||||
8065 | return; | ||||
8066 | } | ||||
8067 | |||||
8068 | if (NewVD->isConstexpr() && !T->isDependentType() && | ||||
8069 | RequireLiteralType(NewVD->getLocation(), T, | ||||
8070 | diag::err_constexpr_var_non_literal)) { | ||||
8071 | NewVD->setInvalidDecl(); | ||||
8072 | return; | ||||
8073 | } | ||||
8074 | |||||
8075 | // PPC MMA non-pointer types are not allowed as non-local variable types. | ||||
8076 | if (Context.getTargetInfo().getTriple().isPPC64() && | ||||
8077 | !NewVD->isLocalVarDecl() && | ||||
8078 | CheckPPCMMAType(T, NewVD->getLocation())) { | ||||
8079 | NewVD->setInvalidDecl(); | ||||
8080 | return; | ||||
8081 | } | ||||
8082 | } | ||||
8083 | |||||
8084 | /// Perform semantic checking on a newly-created variable | ||||
8085 | /// declaration. | ||||
8086 | /// | ||||
8087 | /// This routine performs all of the type-checking required for a | ||||
8088 | /// variable declaration once it has been built. It is used both to | ||||
8089 | /// check variables after they have been parsed and their declarators | ||||
8090 | /// have been translated into a declaration, and to check variables | ||||
8091 | /// that have been instantiated from a template. | ||||
8092 | /// | ||||
8093 | /// Sets NewVD->isInvalidDecl() if an error was encountered. | ||||
8094 | /// | ||||
8095 | /// Returns true if the variable declaration is a redeclaration. | ||||
8096 | bool Sema::CheckVariableDeclaration(VarDecl *NewVD, LookupResult &Previous) { | ||||
8097 | CheckVariableDeclarationType(NewVD); | ||||
8098 | |||||
8099 | // If the decl is already known invalid, don't check it. | ||||
8100 | if (NewVD->isInvalidDecl()) | ||||
8101 | return false; | ||||
8102 | |||||
8103 | // If we did not find anything by this name, look for a non-visible | ||||
8104 | // extern "C" declaration with the same name. | ||||
8105 | if (Previous.empty() && | ||||
8106 | checkForConflictWithNonVisibleExternC(*this, NewVD, Previous)) | ||||
8107 | Previous.setShadowed(); | ||||
8108 | |||||
8109 | if (!Previous.empty()) { | ||||
8110 | MergeVarDecl(NewVD, Previous); | ||||
8111 | return true; | ||||
8112 | } | ||||
8113 | return false; | ||||
8114 | } | ||||
8115 | |||||
8116 | /// AddOverriddenMethods - See if a method overrides any in the base classes, | ||||
8117 | /// and if so, check that it's a valid override and remember it. | ||||
8118 | bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { | ||||
8119 | llvm::SmallPtrSet<const CXXMethodDecl*, 4> Overridden; | ||||
8120 | |||||
8121 | // Look for methods in base classes that this method might override. | ||||
8122 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/false, | ||||
8123 | /*DetectVirtual=*/false); | ||||
8124 | auto VisitBase = [&] (const CXXBaseSpecifier *Specifier, CXXBasePath &Path) { | ||||
8125 | CXXRecordDecl *BaseRecord = Specifier->getType()->getAsCXXRecordDecl(); | ||||
8126 | DeclarationName Name = MD->getDeclName(); | ||||
8127 | |||||
8128 | if (Name.getNameKind() == DeclarationName::CXXDestructorName) { | ||||
8129 | // We really want to find the base class destructor here. | ||||
8130 | QualType T = Context.getTypeDeclType(BaseRecord); | ||||
8131 | CanQualType CT = Context.getCanonicalType(T); | ||||
8132 | Name = Context.DeclarationNames.getCXXDestructorName(CT); | ||||
8133 | } | ||||
8134 | |||||
8135 | for (NamedDecl *BaseND : BaseRecord->lookup(Name)) { | ||||
8136 | CXXMethodDecl *BaseMD = | ||||
8137 | dyn_cast<CXXMethodDecl>(BaseND->getCanonicalDecl()); | ||||
8138 | if (!BaseMD || !BaseMD->isVirtual() || | ||||
8139 | IsOverload(MD, BaseMD, /*UseMemberUsingDeclRules=*/false, | ||||
8140 | /*ConsiderCudaAttrs=*/true, | ||||
8141 | // C++2a [class.virtual]p2 does not consider requires | ||||
8142 | // clauses when overriding. | ||||
8143 | /*ConsiderRequiresClauses=*/false)) | ||||
8144 | continue; | ||||
8145 | |||||
8146 | if (Overridden.insert(BaseMD).second) { | ||||
8147 | MD->addOverriddenMethod(BaseMD); | ||||
8148 | CheckOverridingFunctionReturnType(MD, BaseMD); | ||||
8149 | CheckOverridingFunctionAttributes(MD, BaseMD); | ||||
8150 | CheckOverridingFunctionExceptionSpec(MD, BaseMD); | ||||
8151 | CheckIfOverriddenFunctionIsMarkedFinal(MD, BaseMD); | ||||
8152 | } | ||||
8153 | |||||
8154 | // A method can only override one function from each base class. We | ||||
8155 | // don't track indirectly overridden methods from bases of bases. | ||||
8156 | return true; | ||||
8157 | } | ||||
8158 | |||||
8159 | return false; | ||||
8160 | }; | ||||
8161 | |||||
8162 | DC->lookupInBases(VisitBase, Paths); | ||||
8163 | return !Overridden.empty(); | ||||
8164 | } | ||||
8165 | |||||
8166 | namespace { | ||||
8167 | // Struct for holding all of the extra arguments needed by | ||||
8168 | // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. | ||||
8169 | struct ActOnFDArgs { | ||||
8170 | Scope *S; | ||||
8171 | Declarator &D; | ||||
8172 | MultiTemplateParamsArg TemplateParamLists; | ||||
8173 | bool AddToScope; | ||||
8174 | }; | ||||
8175 | } // end anonymous namespace | ||||
8176 | |||||
8177 | namespace { | ||||
8178 | |||||
8179 | // Callback to only accept typo corrections that have a non-zero edit distance. | ||||
8180 | // Also only accept corrections that have the same parent decl. | ||||
8181 | class DifferentNameValidatorCCC final : public CorrectionCandidateCallback { | ||||
8182 | public: | ||||
8183 | DifferentNameValidatorCCC(ASTContext &Context, FunctionDecl *TypoFD, | ||||
8184 | CXXRecordDecl *Parent) | ||||
8185 | : Context(Context), OriginalFD(TypoFD), | ||||
8186 | ExpectedParent(Parent ? Parent->getCanonicalDecl() : nullptr) {} | ||||
8187 | |||||
8188 | bool ValidateCandidate(const TypoCorrection &candidate) override { | ||||
8189 | if (candidate.getEditDistance() == 0) | ||||
8190 | return false; | ||||
8191 | |||||
8192 | SmallVector<unsigned, 1> MismatchedParams; | ||||
8193 | for (TypoCorrection::const_decl_iterator CDecl = candidate.begin(), | ||||
8194 | CDeclEnd = candidate.end(); | ||||
8195 | CDecl != CDeclEnd; ++CDecl) { | ||||
8196 | FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); | ||||
8197 | |||||
8198 | if (FD && !FD->hasBody() && | ||||
8199 | hasSimilarParameters(Context, FD, OriginalFD, MismatchedParams)) { | ||||
8200 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { | ||||
8201 | CXXRecordDecl *Parent = MD->getParent(); | ||||
8202 | if (Parent && Parent->getCanonicalDecl() == ExpectedParent) | ||||
8203 | return true; | ||||
8204 | } else if (!ExpectedParent) { | ||||
8205 | return true; | ||||
8206 | } | ||||
8207 | } | ||||
8208 | } | ||||
8209 | |||||
8210 | return false; | ||||
8211 | } | ||||
8212 | |||||
8213 | std::unique_ptr<CorrectionCandidateCallback> clone() override { | ||||
8214 | return std::make_unique<DifferentNameValidatorCCC>(*this); | ||||
8215 | } | ||||
8216 | |||||
8217 | private: | ||||
8218 | ASTContext &Context; | ||||
8219 | FunctionDecl *OriginalFD; | ||||
8220 | CXXRecordDecl *ExpectedParent; | ||||
8221 | }; | ||||
8222 | |||||
8223 | } // end anonymous namespace | ||||
8224 | |||||
8225 | void Sema::MarkTypoCorrectedFunctionDefinition(const NamedDecl *F) { | ||||
8226 | TypoCorrectedFunctionDefinitions.insert(F); | ||||
8227 | } | ||||
8228 | |||||
8229 | /// Generate diagnostics for an invalid function redeclaration. | ||||
8230 | /// | ||||
8231 | /// This routine handles generating the diagnostic messages for an invalid | ||||
8232 | /// function redeclaration, including finding possible similar declarations | ||||
8233 | /// or performing typo correction if there are no previous declarations with | ||||
8234 | /// the same name. | ||||
8235 | /// | ||||
8236 | /// Returns a NamedDecl iff typo correction was performed and substituting in | ||||
8237 | /// the new declaration name does not cause new errors. | ||||
8238 | static NamedDecl *DiagnoseInvalidRedeclaration( | ||||
8239 | Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, | ||||
8240 | ActOnFDArgs &ExtraArgs, bool IsLocalFriend, Scope *S) { | ||||
8241 | DeclarationName Name = NewFD->getDeclName(); | ||||
8242 | DeclContext *NewDC = NewFD->getDeclContext(); | ||||
8243 | SmallVector<unsigned, 1> MismatchedParams; | ||||
8244 | SmallVector<std::pair<FunctionDecl *, unsigned>, 1> NearMatches; | ||||
8245 | TypoCorrection Correction; | ||||
8246 | bool IsDefinition = ExtraArgs.D.isFunctionDefinition(); | ||||
8247 | unsigned DiagMsg = | ||||
8248 | IsLocalFriend ? diag::err_no_matching_local_friend : | ||||
8249 | NewFD->getFriendObjectKind() ? diag::err_qualified_friend_no_match : | ||||
8250 | diag::err_member_decl_does_not_match; | ||||
8251 | LookupResult Prev(SemaRef, Name, NewFD->getLocation(), | ||||
8252 | IsLocalFriend ? Sema::LookupLocalFriendName | ||||
8253 | : Sema::LookupOrdinaryName, | ||||
8254 | Sema::ForVisibleRedeclaration); | ||||
8255 | |||||
8256 | NewFD->setInvalidDecl(); | ||||
8257 | if (IsLocalFriend) | ||||
8258 | SemaRef.LookupName(Prev, S); | ||||
8259 | else | ||||
8260 | SemaRef.LookupQualifiedName(Prev, NewDC); | ||||
8261 | assert(!Prev.isAmbiguous() &&((!Prev.isAmbiguous() && "Cannot have an ambiguity in previous-declaration lookup" ) ? static_cast<void> (0) : __assert_fail ("!Prev.isAmbiguous() && \"Cannot have an ambiguity in previous-declaration lookup\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 8262, __PRETTY_FUNCTION__)) | ||||
8262 | "Cannot have an ambiguity in previous-declaration lookup")((!Prev.isAmbiguous() && "Cannot have an ambiguity in previous-declaration lookup" ) ? static_cast<void> (0) : __assert_fail ("!Prev.isAmbiguous() && \"Cannot have an ambiguity in previous-declaration lookup\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 8262, __PRETTY_FUNCTION__)); | ||||
8263 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); | ||||
8264 | DifferentNameValidatorCCC CCC(SemaRef.Context, NewFD, | ||||
8265 | MD ? MD->getParent() : nullptr); | ||||
8266 | if (!Prev.empty()) { | ||||
8267 | for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); | ||||
8268 | Func != FuncEnd; ++Func) { | ||||
8269 | FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); | ||||
8270 | if (FD && | ||||
8271 | hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { | ||||
8272 | // Add 1 to the index so that 0 can mean the mismatch didn't | ||||
8273 | // involve a parameter | ||||
8274 | unsigned ParamNum = | ||||
8275 | MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; | ||||
8276 | NearMatches.push_back(std::make_pair(FD, ParamNum)); | ||||
8277 | } | ||||
8278 | } | ||||
8279 | // If the qualified name lookup yielded nothing, try typo correction | ||||
8280 | } else if ((Correction = SemaRef.CorrectTypo( | ||||
8281 | Prev.getLookupNameInfo(), Prev.getLookupKind(), S, | ||||
8282 | &ExtraArgs.D.getCXXScopeSpec(), CCC, Sema::CTK_ErrorRecovery, | ||||
8283 | IsLocalFriend ? nullptr : NewDC))) { | ||||
8284 | // Set up everything for the call to ActOnFunctionDeclarator | ||||
8285 | ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), | ||||
8286 | ExtraArgs.D.getIdentifierLoc()); | ||||
8287 | Previous.clear(); | ||||
8288 | Previous.setLookupName(Correction.getCorrection()); | ||||
8289 | for (TypoCorrection::decl_iterator CDecl = Correction.begin(), | ||||
8290 | CDeclEnd = Correction.end(); | ||||
8291 | CDecl != CDeclEnd; ++CDecl) { | ||||
8292 | FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); | ||||
8293 | if (FD && !FD->hasBody() && | ||||
8294 | hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { | ||||
8295 | Previous.addDecl(FD); | ||||
8296 | } | ||||
8297 | } | ||||
8298 | bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); | ||||
8299 | |||||
8300 | NamedDecl *Result; | ||||
8301 | // Retry building the function declaration with the new previous | ||||
8302 | // declarations, and with errors suppressed. | ||||
8303 | { | ||||
8304 | // Trap errors. | ||||
8305 | Sema::SFINAETrap Trap(SemaRef); | ||||
8306 | |||||
8307 | // TODO: Refactor ActOnFunctionDeclarator so that we can call only the | ||||
8308 | // pieces need to verify the typo-corrected C++ declaration and hopefully | ||||
8309 | // eliminate the need for the parameter pack ExtraArgs. | ||||
8310 | Result = SemaRef.ActOnFunctionDeclarator( | ||||
8311 | ExtraArgs.S, ExtraArgs.D, | ||||
8312 | Correction.getCorrectionDecl()->getDeclContext(), | ||||
8313 | NewFD->getTypeSourceInfo(), Previous, ExtraArgs.TemplateParamLists, | ||||
8314 | ExtraArgs.AddToScope); | ||||
8315 | |||||
8316 | if (Trap.hasErrorOccurred()) | ||||
8317 | Result = nullptr; | ||||
8318 | } | ||||
8319 | |||||
8320 | if (Result) { | ||||
8321 | // Determine which correction we picked. | ||||
8322 | Decl *Canonical = Result->getCanonicalDecl(); | ||||
8323 | for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); | ||||
8324 | I != E; ++I) | ||||
8325 | if ((*I)->getCanonicalDecl() == Canonical) | ||||
8326 | Correction.setCorrectionDecl(*I); | ||||
8327 | |||||
8328 | // Let Sema know about the correction. | ||||
8329 | SemaRef.MarkTypoCorrectedFunctionDefinition(Result); | ||||
8330 | SemaRef.diagnoseTypo( | ||||
8331 | Correction, | ||||
8332 | SemaRef.PDiag(IsLocalFriend | ||||
8333 | ? diag::err_no_matching_local_friend_suggest | ||||
8334 | : diag::err_member_decl_does_not_match_suggest) | ||||
8335 | << Name << NewDC << IsDefinition); | ||||
8336 | return Result; | ||||
8337 | } | ||||
8338 | |||||
8339 | // Pretend the typo correction never occurred | ||||
8340 | ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), | ||||
8341 | ExtraArgs.D.getIdentifierLoc()); | ||||
8342 | ExtraArgs.D.setRedeclaration(wasRedeclaration); | ||||
8343 | Previous.clear(); | ||||
8344 | Previous.setLookupName(Name); | ||||
8345 | } | ||||
8346 | |||||
8347 | SemaRef.Diag(NewFD->getLocation(), DiagMsg) | ||||
8348 | << Name << NewDC << IsDefinition << NewFD->getLocation(); | ||||
8349 | |||||
8350 | bool NewFDisConst = false; | ||||
8351 | if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) | ||||
8352 | NewFDisConst = NewMD->isConst(); | ||||
8353 | |||||
8354 | for (SmallVectorImpl<std::pair<FunctionDecl *, unsigned> >::iterator | ||||
8355 | NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); | ||||
8356 | NearMatch != NearMatchEnd; ++NearMatch) { | ||||
8357 | FunctionDecl *FD = NearMatch->first; | ||||
8358 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); | ||||
8359 | bool FDisConst = MD && MD->isConst(); | ||||
8360 | bool IsMember = MD || !IsLocalFriend; | ||||
8361 | |||||
8362 | // FIXME: These notes are poorly worded for the local friend case. | ||||
8363 | if (unsigned Idx = NearMatch->second) { | ||||
8364 | ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); | ||||
8365 | SourceLocation Loc = FDParam->getTypeSpecStartLoc(); | ||||
8366 | if (Loc.isInvalid()) Loc = FD->getLocation(); | ||||
8367 | SemaRef.Diag(Loc, IsMember ? diag::note_member_def_close_param_match | ||||
8368 | : diag::note_local_decl_close_param_match) | ||||
8369 | << Idx << FDParam->getType() | ||||
8370 | << NewFD->getParamDecl(Idx - 1)->getType(); | ||||
8371 | } else if (FDisConst != NewFDisConst) { | ||||
8372 | SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) | ||||
8373 | << NewFDisConst << FD->getSourceRange().getEnd(); | ||||
8374 | } else | ||||
8375 | SemaRef.Diag(FD->getLocation(), | ||||
8376 | IsMember ? diag::note_member_def_close_match | ||||
8377 | : diag::note_local_decl_close_match); | ||||
8378 | } | ||||
8379 | return nullptr; | ||||
8380 | } | ||||
8381 | |||||
8382 | static StorageClass getFunctionStorageClass(Sema &SemaRef, Declarator &D) { | ||||
8383 | switch (D.getDeclSpec().getStorageClassSpec()) { | ||||
8384 | default: llvm_unreachable("Unknown storage class!")::llvm::llvm_unreachable_internal("Unknown storage class!", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 8384); | ||||
8385 | case DeclSpec::SCS_auto: | ||||
8386 | case DeclSpec::SCS_register: | ||||
8387 | case DeclSpec::SCS_mutable: | ||||
8388 | SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), | ||||
8389 | diag::err_typecheck_sclass_func); | ||||
8390 | D.getMutableDeclSpec().ClearStorageClassSpecs(); | ||||
8391 | D.setInvalidType(); | ||||
8392 | break; | ||||
8393 | case DeclSpec::SCS_unspecified: break; | ||||
8394 | case DeclSpec::SCS_extern: | ||||
8395 | if (D.getDeclSpec().isExternInLinkageSpec()) | ||||
8396 | return SC_None; | ||||
8397 | return SC_Extern; | ||||
8398 | case DeclSpec::SCS_static: { | ||||
8399 | if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { | ||||
8400 | // C99 6.7.1p5: | ||||
8401 | // The declaration of an identifier for a function that has | ||||
8402 | // block scope shall have no explicit storage-class specifier | ||||
8403 | // other than extern | ||||
8404 | // See also (C++ [dcl.stc]p4). | ||||
8405 | SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), | ||||
8406 | diag::err_static_block_func); | ||||
8407 | break; | ||||
8408 | } else | ||||
8409 | return SC_Static; | ||||
8410 | } | ||||
8411 | case DeclSpec::SCS_private_extern: return SC_PrivateExtern; | ||||
8412 | } | ||||
8413 | |||||
8414 | // No explicit storage class has already been returned | ||||
8415 | return SC_None; | ||||
8416 | } | ||||
8417 | |||||
8418 | static FunctionDecl *CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, | ||||
8419 | DeclContext *DC, QualType &R, | ||||
8420 | TypeSourceInfo *TInfo, | ||||
8421 | StorageClass SC, | ||||
8422 | bool &IsVirtualOkay) { | ||||
8423 | DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); | ||||
8424 | DeclarationName Name = NameInfo.getName(); | ||||
8425 | |||||
8426 | FunctionDecl *NewFD = nullptr; | ||||
8427 | bool isInline = D.getDeclSpec().isInlineSpecified(); | ||||
8428 | |||||
8429 | if (!SemaRef.getLangOpts().CPlusPlus) { | ||||
8430 | // Determine whether the function was written with a | ||||
8431 | // prototype. This true when: | ||||
8432 | // - there is a prototype in the declarator, or | ||||
8433 | // - the type R of the function is some kind of typedef or other non- | ||||
8434 | // attributed reference to a type name (which eventually refers to a | ||||
8435 | // function type). | ||||
8436 | bool HasPrototype = | ||||
8437 | (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || | ||||
8438 | (!R->getAsAdjusted<FunctionType>() && R->isFunctionProtoType()); | ||||
8439 | |||||
8440 | NewFD = FunctionDecl::Create(SemaRef.Context, DC, D.getBeginLoc(), NameInfo, | ||||
8441 | R, TInfo, SC, isInline, HasPrototype, | ||||
8442 | ConstexprSpecKind::Unspecified, | ||||
8443 | /*TrailingRequiresClause=*/nullptr); | ||||
8444 | if (D.isInvalidType()) | ||||
8445 | NewFD->setInvalidDecl(); | ||||
8446 | |||||
8447 | return NewFD; | ||||
8448 | } | ||||
8449 | |||||
8450 | ExplicitSpecifier ExplicitSpecifier = D.getDeclSpec().getExplicitSpecifier(); | ||||
8451 | |||||
8452 | ConstexprSpecKind ConstexprKind = D.getDeclSpec().getConstexprSpecifier(); | ||||
8453 | if (ConstexprKind == ConstexprSpecKind::Constinit) { | ||||
8454 | SemaRef.Diag(D.getDeclSpec().getConstexprSpecLoc(), | ||||
8455 | diag::err_constexpr_wrong_decl_kind) | ||||
8456 | << static_cast<int>(ConstexprKind); | ||||
8457 | ConstexprKind = ConstexprSpecKind::Unspecified; | ||||
8458 | D.getMutableDeclSpec().ClearConstexprSpec(); | ||||
8459 | } | ||||
8460 | Expr *TrailingRequiresClause = D.getTrailingRequiresClause(); | ||||
8461 | |||||
8462 | // Check that the return type is not an abstract class type. | ||||
8463 | // For record types, this is done by the AbstractClassUsageDiagnoser once | ||||
8464 | // the class has been completely parsed. | ||||
8465 | if (!DC->isRecord() && | ||||
8466 | SemaRef.RequireNonAbstractType( | ||||
8467 | D.getIdentifierLoc(), R->castAs<FunctionType>()->getReturnType(), | ||||
8468 | diag::err_abstract_type_in_decl, SemaRef.AbstractReturnType)) | ||||
8469 | D.setInvalidType(); | ||||
8470 | |||||
8471 | if (Name.getNameKind() == DeclarationName::CXXConstructorName) { | ||||
8472 | // This is a C++ constructor declaration. | ||||
8473 | assert(DC->isRecord() &&((DC->isRecord() && "Constructors can only be declared in a member context" ) ? static_cast<void> (0) : __assert_fail ("DC->isRecord() && \"Constructors can only be declared in a member context\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 8474, __PRETTY_FUNCTION__)) | ||||
8474 | "Constructors can only be declared in a member context")((DC->isRecord() && "Constructors can only be declared in a member context" ) ? static_cast<void> (0) : __assert_fail ("DC->isRecord() && \"Constructors can only be declared in a member context\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 8474, __PRETTY_FUNCTION__)); | ||||
8475 | |||||
8476 | R = SemaRef.CheckConstructorDeclarator(D, R, SC); | ||||
8477 | return CXXConstructorDecl::Create( | ||||
8478 | SemaRef.Context, cast<CXXRecordDecl>(DC), D.getBeginLoc(), NameInfo, R, | ||||
8479 | TInfo, ExplicitSpecifier, isInline, | ||||
8480 | /*isImplicitlyDeclared=*/false, ConstexprKind, InheritedConstructor(), | ||||
8481 | TrailingRequiresClause); | ||||
8482 | |||||
8483 | } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { | ||||
8484 | // This is a C++ destructor declaration. | ||||
8485 | if (DC->isRecord()) { | ||||
8486 | R = SemaRef.CheckDestructorDeclarator(D, R, SC); | ||||
8487 | CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); | ||||
8488 | CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( | ||||
8489 | SemaRef.Context, Record, D.getBeginLoc(), NameInfo, R, TInfo, | ||||
8490 | isInline, /*isImplicitlyDeclared=*/false, ConstexprKind, | ||||
8491 | TrailingRequiresClause); | ||||
8492 | |||||
8493 | // If the destructor needs an implicit exception specification, set it | ||||
8494 | // now. FIXME: It'd be nice to be able to create the right type to start | ||||
8495 | // with, but the type needs to reference the destructor declaration. | ||||
8496 | if (SemaRef.getLangOpts().CPlusPlus11) | ||||
8497 | SemaRef.AdjustDestructorExceptionSpec(NewDD); | ||||
8498 | |||||
8499 | IsVirtualOkay = true; | ||||
8500 | return NewDD; | ||||
8501 | |||||
8502 | } else { | ||||
8503 | SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); | ||||
8504 | D.setInvalidType(); | ||||
8505 | |||||
8506 | // Create a FunctionDecl to satisfy the function definition parsing | ||||
8507 | // code path. | ||||
8508 | return FunctionDecl::Create(SemaRef.Context, DC, D.getBeginLoc(), | ||||
8509 | D.getIdentifierLoc(), Name, R, TInfo, SC, | ||||
8510 | isInline, | ||||
8511 | /*hasPrototype=*/true, ConstexprKind, | ||||
8512 | TrailingRequiresClause); | ||||
8513 | } | ||||
8514 | |||||
8515 | } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { | ||||
8516 | if (!DC->isRecord()) { | ||||
8517 | SemaRef.Diag(D.getIdentifierLoc(), | ||||
8518 | diag::err_conv_function_not_member); | ||||
8519 | return nullptr; | ||||
8520 | } | ||||
8521 | |||||
8522 | SemaRef.CheckConversionDeclarator(D, R, SC); | ||||
8523 | if (D.isInvalidType()) | ||||
8524 | return nullptr; | ||||
8525 | |||||
8526 | IsVirtualOkay = true; | ||||
8527 | return CXXConversionDecl::Create( | ||||
8528 | SemaRef.Context, cast<CXXRecordDecl>(DC), D.getBeginLoc(), NameInfo, R, | ||||
8529 | TInfo, isInline, ExplicitSpecifier, ConstexprKind, SourceLocation(), | ||||
8530 | TrailingRequiresClause); | ||||
8531 | |||||
8532 | } else if (Name.getNameKind() == DeclarationName::CXXDeductionGuideName) { | ||||
8533 | if (TrailingRequiresClause) | ||||
8534 | SemaRef.Diag(TrailingRequiresClause->getBeginLoc(), | ||||
8535 | diag::err_trailing_requires_clause_on_deduction_guide) | ||||
8536 | << TrailingRequiresClause->getSourceRange(); | ||||
8537 | SemaRef.CheckDeductionGuideDeclarator(D, R, SC); | ||||
8538 | |||||
8539 | return CXXDeductionGuideDecl::Create(SemaRef.Context, DC, D.getBeginLoc(), | ||||
8540 | ExplicitSpecifier, NameInfo, R, TInfo, | ||||
8541 | D.getEndLoc()); | ||||
8542 | } else if (DC->isRecord()) { | ||||
8543 | // If the name of the function is the same as the name of the record, | ||||
8544 | // then this must be an invalid constructor that has a return type. | ||||
8545 | // (The parser checks for a return type and makes the declarator a | ||||
8546 | // constructor if it has no return type). | ||||
8547 | if (Name.getAsIdentifierInfo() && | ||||
8548 | Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ | ||||
8549 | SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) | ||||
8550 | << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) | ||||
8551 | << SourceRange(D.getIdentifierLoc()); | ||||
8552 | return nullptr; | ||||
8553 | } | ||||
8554 | |||||
8555 | // This is a C++ method declaration. | ||||
8556 | CXXMethodDecl *Ret = CXXMethodDecl::Create( | ||||
8557 | SemaRef.Context, cast<CXXRecordDecl>(DC), D.getBeginLoc(), NameInfo, R, | ||||
8558 | TInfo, SC, isInline, ConstexprKind, SourceLocation(), | ||||
8559 | TrailingRequiresClause); | ||||
8560 | IsVirtualOkay = !Ret->isStatic(); | ||||
8561 | return Ret; | ||||
8562 | } else { | ||||
8563 | bool isFriend = | ||||
8564 | SemaRef.getLangOpts().CPlusPlus && D.getDeclSpec().isFriendSpecified(); | ||||
8565 | if (!isFriend && SemaRef.CurContext->isRecord()) | ||||
8566 | return nullptr; | ||||
8567 | |||||
8568 | // Determine whether the function was written with a | ||||
8569 | // prototype. This true when: | ||||
8570 | // - we're in C++ (where every function has a prototype), | ||||
8571 | return FunctionDecl::Create(SemaRef.Context, DC, D.getBeginLoc(), NameInfo, | ||||
8572 | R, TInfo, SC, isInline, true /*HasPrototype*/, | ||||
8573 | ConstexprKind, TrailingRequiresClause); | ||||
8574 | } | ||||
8575 | } | ||||
8576 | |||||
8577 | enum OpenCLParamType { | ||||
8578 | ValidKernelParam, | ||||
8579 | PtrPtrKernelParam, | ||||
8580 | PtrKernelParam, | ||||
8581 | InvalidAddrSpacePtrKernelParam, | ||||
8582 | InvalidKernelParam, | ||||
8583 | RecordKernelParam | ||||
8584 | }; | ||||
8585 | |||||
8586 | static bool isOpenCLSizeDependentType(ASTContext &C, QualType Ty) { | ||||
8587 | // Size dependent types are just typedefs to normal integer types | ||||
8588 | // (e.g. unsigned long), so we cannot distinguish them from other typedefs to | ||||
8589 | // integers other than by their names. | ||||
8590 | StringRef SizeTypeNames[] = {"size_t", "intptr_t", "uintptr_t", "ptrdiff_t"}; | ||||
8591 | |||||
8592 | // Remove typedefs one by one until we reach a typedef | ||||
8593 | // for a size dependent type. | ||||
8594 | QualType DesugaredTy = Ty; | ||||
8595 | do { | ||||
8596 | ArrayRef<StringRef> Names(SizeTypeNames); | ||||
8597 | auto Match = llvm::find(Names, DesugaredTy.getUnqualifiedType().getAsString()); | ||||
8598 | if (Names.end() != Match) | ||||
8599 | return true; | ||||
8600 | |||||
8601 | Ty = DesugaredTy; | ||||
8602 | DesugaredTy = Ty.getSingleStepDesugaredType(C); | ||||
8603 | } while (DesugaredTy != Ty); | ||||
8604 | |||||
8605 | return false; | ||||
8606 | } | ||||
8607 | |||||
8608 | static OpenCLParamType getOpenCLKernelParameterType(Sema &S, QualType PT) { | ||||
8609 | if (PT->isPointerType()) { | ||||
8610 | QualType PointeeType = PT->getPointeeType(); | ||||
8611 | if (PointeeType.getAddressSpace() == LangAS::opencl_generic || | ||||
8612 | PointeeType.getAddressSpace() == LangAS::opencl_private || | ||||
8613 | PointeeType.getAddressSpace() == LangAS::Default) | ||||
8614 | return InvalidAddrSpacePtrKernelParam; | ||||
8615 | |||||
8616 | if (PointeeType->isPointerType()) { | ||||
8617 | // This is a pointer to pointer parameter. | ||||
8618 | // Recursively check inner type. | ||||
8619 | OpenCLParamType ParamKind = getOpenCLKernelParameterType(S, PointeeType); | ||||
8620 | if (ParamKind == InvalidAddrSpacePtrKernelParam || | ||||
8621 | ParamKind == InvalidKernelParam) | ||||
8622 | return ParamKind; | ||||
8623 | |||||
8624 | return PtrPtrKernelParam; | ||||
8625 | } | ||||
8626 | return PtrKernelParam; | ||||
8627 | } | ||||
8628 | |||||
8629 | // OpenCL v1.2 s6.9.k: | ||||
8630 | // Arguments to kernel functions in a program cannot be declared with the | ||||
8631 | // built-in scalar types bool, half, size_t, ptrdiff_t, intptr_t, and | ||||
8632 | // uintptr_t or a struct and/or union that contain fields declared to be one | ||||
8633 | // of these built-in scalar types. | ||||
8634 | if (isOpenCLSizeDependentType(S.getASTContext(), PT)) | ||||
8635 | return InvalidKernelParam; | ||||
8636 | |||||
8637 | if (PT->isImageType()) | ||||
8638 | return PtrKernelParam; | ||||
8639 | |||||
8640 | if (PT->isBooleanType() || PT->isEventT() || PT->isReserveIDT()) | ||||
8641 | return InvalidKernelParam; | ||||
8642 | |||||
8643 | // OpenCL extension spec v1.2 s9.5: | ||||
8644 | // This extension adds support for half scalar and vector types as built-in | ||||
8645 | // types that can be used for arithmetic operations, conversions etc. | ||||
8646 | if (!S.getOpenCLOptions().isEnabled("cl_khr_fp16") && PT->isHalfType()) | ||||
8647 | return InvalidKernelParam; | ||||
8648 | |||||
8649 | if (PT->isRecordType()) | ||||
8650 | return RecordKernelParam; | ||||
8651 | |||||
8652 | // Look into an array argument to check if it has a forbidden type. | ||||
8653 | if (PT->isArrayType()) { | ||||
8654 | const Type *UnderlyingTy = PT->getPointeeOrArrayElementType(); | ||||
8655 | // Call ourself to check an underlying type of an array. Since the | ||||
8656 | // getPointeeOrArrayElementType returns an innermost type which is not an | ||||
8657 | // array, this recursive call only happens once. | ||||
8658 | return getOpenCLKernelParameterType(S, QualType(UnderlyingTy, 0)); | ||||
8659 | } | ||||
8660 | |||||
8661 | return ValidKernelParam; | ||||
8662 | } | ||||
8663 | |||||
8664 | static void checkIsValidOpenCLKernelParameter( | ||||
8665 | Sema &S, | ||||
8666 | Declarator &D, | ||||
8667 | ParmVarDecl *Param, | ||||
8668 | llvm::SmallPtrSetImpl<const Type *> &ValidTypes) { | ||||
8669 | QualType PT = Param->getType(); | ||||
8670 | |||||
8671 | // Cache the valid types we encounter to avoid rechecking structs that are | ||||
8672 | // used again | ||||
8673 | if (ValidTypes.count(PT.getTypePtr())) | ||||
8674 | return; | ||||
8675 | |||||
8676 | switch (getOpenCLKernelParameterType(S, PT)) { | ||||
8677 | case PtrPtrKernelParam: | ||||
8678 | // OpenCL v3.0 s6.11.a: | ||||
8679 | // A kernel function argument cannot be declared as a pointer to a pointer | ||||
8680 | // type. [...] This restriction only applies to OpenCL C 1.2 or below. | ||||
8681 | if (S.getLangOpts().OpenCLVersion < 120 && | ||||
8682 | !S.getLangOpts().OpenCLCPlusPlus) { | ||||
8683 | S.Diag(Param->getLocation(), diag::err_opencl_ptrptr_kernel_param); | ||||
8684 | D.setInvalidType(); | ||||
8685 | return; | ||||
8686 | } | ||||
8687 | |||||
8688 | ValidTypes.insert(PT.getTypePtr()); | ||||
8689 | return; | ||||
8690 | |||||
8691 | case InvalidAddrSpacePtrKernelParam: | ||||
8692 | // OpenCL v1.0 s6.5: | ||||
8693 | // __kernel function arguments declared to be a pointer of a type can point | ||||
8694 | // to one of the following address spaces only : __global, __local or | ||||
8695 | // __constant. | ||||
8696 | S.Diag(Param->getLocation(), diag::err_kernel_arg_address_space); | ||||
8697 | D.setInvalidType(); | ||||
8698 | return; | ||||
8699 | |||||
8700 | // OpenCL v1.2 s6.9.k: | ||||
8701 | // Arguments to kernel functions in a program cannot be declared with the | ||||
8702 | // built-in scalar types bool, half, size_t, ptrdiff_t, intptr_t, and | ||||
8703 | // uintptr_t or a struct and/or union that contain fields declared to be | ||||
8704 | // one of these built-in scalar types. | ||||
8705 | |||||
8706 | case InvalidKernelParam: | ||||
8707 | // OpenCL v1.2 s6.8 n: | ||||
8708 | // A kernel function argument cannot be declared | ||||
8709 | // of event_t type. | ||||
8710 | // Do not diagnose half type since it is diagnosed as invalid argument | ||||
8711 | // type for any function elsewhere. | ||||
8712 | if (!PT->isHalfType()) { | ||||
8713 | S.Diag(Param->getLocation(), diag::err_bad_kernel_param_type) << PT; | ||||
8714 | |||||
8715 | // Explain what typedefs are involved. | ||||
8716 | const TypedefType *Typedef = nullptr; | ||||
8717 | while ((Typedef = PT->getAs<TypedefType>())) { | ||||
8718 | SourceLocation Loc = Typedef->getDecl()->getLocation(); | ||||
8719 | // SourceLocation may be invalid for a built-in type. | ||||
8720 | if (Loc.isValid()) | ||||
8721 | S.Diag(Loc, diag::note_entity_declared_at) << PT; | ||||
8722 | PT = Typedef->desugar(); | ||||
8723 | } | ||||
8724 | } | ||||
8725 | |||||
8726 | D.setInvalidType(); | ||||
8727 | return; | ||||
8728 | |||||
8729 | case PtrKernelParam: | ||||
8730 | case ValidKernelParam: | ||||
8731 | ValidTypes.insert(PT.getTypePtr()); | ||||
8732 | return; | ||||
8733 | |||||
8734 | case RecordKernelParam: | ||||
8735 | break; | ||||
8736 | } | ||||
8737 | |||||
8738 | // Track nested structs we will inspect | ||||
8739 | SmallVector<const Decl *, 4> VisitStack; | ||||
8740 | |||||
8741 | // Track where we are in the nested structs. Items will migrate from | ||||
8742 | // VisitStack to HistoryStack as we do the DFS for bad field. | ||||
8743 | SmallVector<const FieldDecl *, 4> HistoryStack; | ||||
8744 | HistoryStack.push_back(nullptr); | ||||
8745 | |||||
8746 | // At this point we already handled everything except of a RecordType or | ||||
8747 | // an ArrayType of a RecordType. | ||||
8748 | assert((PT->isArrayType() || PT->isRecordType()) && "Unexpected type.")(((PT->isArrayType() || PT->isRecordType()) && "Unexpected type." ) ? static_cast<void> (0) : __assert_fail ("(PT->isArrayType() || PT->isRecordType()) && \"Unexpected type.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 8748, __PRETTY_FUNCTION__)); | ||||
8749 | const RecordType *RecTy = | ||||
8750 | PT->getPointeeOrArrayElementType()->getAs<RecordType>(); | ||||
8751 | const RecordDecl *OrigRecDecl = RecTy->getDecl(); | ||||
8752 | |||||
8753 | VisitStack.push_back(RecTy->getDecl()); | ||||
8754 | assert(VisitStack.back() && "First decl null?")((VisitStack.back() && "First decl null?") ? static_cast <void> (0) : __assert_fail ("VisitStack.back() && \"First decl null?\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 8754, __PRETTY_FUNCTION__)); | ||||
8755 | |||||
8756 | do { | ||||
8757 | const Decl *Next = VisitStack.pop_back_val(); | ||||
8758 | if (!Next) { | ||||
8759 | assert(!HistoryStack.empty())((!HistoryStack.empty()) ? static_cast<void> (0) : __assert_fail ("!HistoryStack.empty()", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 8759, __PRETTY_FUNCTION__)); | ||||
8760 | // Found a marker, we have gone up a level | ||||
8761 | if (const FieldDecl *Hist = HistoryStack.pop_back_val()) | ||||
8762 | ValidTypes.insert(Hist->getType().getTypePtr()); | ||||
8763 | |||||
8764 | continue; | ||||
8765 | } | ||||
8766 | |||||
8767 | // Adds everything except the original parameter declaration (which is not a | ||||
8768 | // field itself) to the history stack. | ||||
8769 | const RecordDecl *RD; | ||||
8770 | if (const FieldDecl *Field = dyn_cast<FieldDecl>(Next)) { | ||||
8771 | HistoryStack.push_back(Field); | ||||
8772 | |||||
8773 | QualType FieldTy = Field->getType(); | ||||
8774 | // Other field types (known to be valid or invalid) are handled while we | ||||
8775 | // walk around RecordDecl::fields(). | ||||
8776 | assert((FieldTy->isArrayType() || FieldTy->isRecordType()) &&(((FieldTy->isArrayType() || FieldTy->isRecordType()) && "Unexpected type.") ? static_cast<void> (0) : __assert_fail ("(FieldTy->isArrayType() || FieldTy->isRecordType()) && \"Unexpected type.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 8777, __PRETTY_FUNCTION__)) | ||||
8777 | "Unexpected type.")(((FieldTy->isArrayType() || FieldTy->isRecordType()) && "Unexpected type.") ? static_cast<void> (0) : __assert_fail ("(FieldTy->isArrayType() || FieldTy->isRecordType()) && \"Unexpected type.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 8777, __PRETTY_FUNCTION__)); | ||||
8778 | const Type *FieldRecTy = FieldTy->getPointeeOrArrayElementType(); | ||||
8779 | |||||
8780 | RD = FieldRecTy->castAs<RecordType>()->getDecl(); | ||||
8781 | } else { | ||||
8782 | RD = cast<RecordDecl>(Next); | ||||
8783 | } | ||||
8784 | |||||
8785 | // Add a null marker so we know when we've gone back up a level | ||||
8786 | VisitStack.push_back(nullptr); | ||||
8787 | |||||
8788 | for (const auto *FD : RD->fields()) { | ||||
8789 | QualType QT = FD->getType(); | ||||
8790 | |||||
8791 | if (ValidTypes.count(QT.getTypePtr())) | ||||
8792 | continue; | ||||
8793 | |||||
8794 | OpenCLParamType ParamType = getOpenCLKernelParameterType(S, QT); | ||||
8795 | if (ParamType == ValidKernelParam) | ||||
8796 | continue; | ||||
8797 | |||||
8798 | if (ParamType == RecordKernelParam) { | ||||
8799 | VisitStack.push_back(FD); | ||||
8800 | continue; | ||||
8801 | } | ||||
8802 | |||||
8803 | // OpenCL v1.2 s6.9.p: | ||||
8804 | // Arguments to kernel functions that are declared to be a struct or union | ||||
8805 | // do not allow OpenCL objects to be passed as elements of the struct or | ||||
8806 | // union. | ||||
8807 | if (ParamType == PtrKernelParam || ParamType == PtrPtrKernelParam || | ||||
8808 | ParamType == InvalidAddrSpacePtrKernelParam) { | ||||
8809 | S.Diag(Param->getLocation(), | ||||
8810 | diag::err_record_with_pointers_kernel_param) | ||||
8811 | << PT->isUnionType() | ||||
8812 | << PT; | ||||
8813 | } else { | ||||
8814 | S.Diag(Param->getLocation(), diag::err_bad_kernel_param_type) << PT; | ||||
8815 | } | ||||
8816 | |||||
8817 | S.Diag(OrigRecDecl->getLocation(), diag::note_within_field_of_type) | ||||
8818 | << OrigRecDecl->getDeclName(); | ||||
8819 | |||||
8820 | // We have an error, now let's go back up through history and show where | ||||
8821 | // the offending field came from | ||||
8822 | for (ArrayRef<const FieldDecl *>::const_iterator | ||||
8823 | I = HistoryStack.begin() + 1, | ||||
8824 | E = HistoryStack.end(); | ||||
8825 | I != E; ++I) { | ||||
8826 | const FieldDecl *OuterField = *I; | ||||
8827 | S.Diag(OuterField->getLocation(), diag::note_within_field_of_type) | ||||
8828 | << OuterField->getType(); | ||||
8829 | } | ||||
8830 | |||||
8831 | S.Diag(FD->getLocation(), diag::note_illegal_field_declared_here) | ||||
8832 | << QT->isPointerType() | ||||
8833 | << QT; | ||||
8834 | D.setInvalidType(); | ||||
8835 | return; | ||||
8836 | } | ||||
8837 | } while (!VisitStack.empty()); | ||||
8838 | } | ||||
8839 | |||||
8840 | /// Find the DeclContext in which a tag is implicitly declared if we see an | ||||
8841 | /// elaborated type specifier in the specified context, and lookup finds | ||||
8842 | /// nothing. | ||||
8843 | static DeclContext *getTagInjectionContext(DeclContext *DC) { | ||||
8844 | while (!DC->isFileContext() && !DC->isFunctionOrMethod()) | ||||
8845 | DC = DC->getParent(); | ||||
8846 | return DC; | ||||
8847 | } | ||||
8848 | |||||
8849 | /// Find the Scope in which a tag is implicitly declared if we see an | ||||
8850 | /// elaborated type specifier in the specified context, and lookup finds | ||||
8851 | /// nothing. | ||||
8852 | static Scope *getTagInjectionScope(Scope *S, const LangOptions &LangOpts) { | ||||
8853 | while (S->isClassScope() || | ||||
8854 | (LangOpts.CPlusPlus && | ||||
8855 | S->isFunctionPrototypeScope()) || | ||||
8856 | ((S->getFlags() & Scope::DeclScope) == 0) || | ||||
8857 | (S->getEntity() && S->getEntity()->isTransparentContext())) | ||||
8858 | S = S->getParent(); | ||||
8859 | return S; | ||||
8860 | } | ||||
8861 | |||||
8862 | NamedDecl* | ||||
8863 | Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, | ||||
8864 | TypeSourceInfo *TInfo, LookupResult &Previous, | ||||
8865 | MultiTemplateParamsArg TemplateParamListsRef, | ||||
8866 | bool &AddToScope) { | ||||
8867 | QualType R = TInfo->getType(); | ||||
8868 | |||||
8869 | assert(R->isFunctionType())((R->isFunctionType()) ? static_cast<void> (0) : __assert_fail ("R->isFunctionType()", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 8869, __PRETTY_FUNCTION__)); | ||||
8870 | if (R.getCanonicalType()->castAs<FunctionType>()->getCmseNSCallAttr()) | ||||
8871 | Diag(D.getIdentifierLoc(), diag::err_function_decl_cmse_ns_call); | ||||
8872 | |||||
8873 | SmallVector<TemplateParameterList *, 4> TemplateParamLists; | ||||
8874 | for (TemplateParameterList *TPL : TemplateParamListsRef) | ||||
8875 | TemplateParamLists.push_back(TPL); | ||||
8876 | if (TemplateParameterList *Invented = D.getInventedTemplateParameterList()) { | ||||
8877 | if (!TemplateParamLists.empty() && | ||||
8878 | Invented->getDepth() == TemplateParamLists.back()->getDepth()) | ||||
8879 | TemplateParamLists.back() = Invented; | ||||
8880 | else | ||||
8881 | TemplateParamLists.push_back(Invented); | ||||
8882 | } | ||||
8883 | |||||
8884 | // TODO: consider using NameInfo for diagnostic. | ||||
8885 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); | ||||
8886 | DeclarationName Name = NameInfo.getName(); | ||||
8887 | StorageClass SC = getFunctionStorageClass(*this, D); | ||||
8888 | |||||
8889 | if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) | ||||
8890 | Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), | ||||
8891 | diag::err_invalid_thread) | ||||
8892 | << DeclSpec::getSpecifierName(TSCS); | ||||
8893 | |||||
8894 | if (D.isFirstDeclarationOfMember()) | ||||
8895 | adjustMemberFunctionCC(R, D.isStaticMember(), D.isCtorOrDtor(), | ||||
8896 | D.getIdentifierLoc()); | ||||
8897 | |||||
8898 | bool isFriend = false; | ||||
8899 | FunctionTemplateDecl *FunctionTemplate = nullptr; | ||||
8900 | bool isMemberSpecialization = false; | ||||
8901 | bool isFunctionTemplateSpecialization = false; | ||||
8902 | |||||
8903 | bool isDependentClassScopeExplicitSpecialization = false; | ||||
8904 | bool HasExplicitTemplateArgs = false; | ||||
8905 | TemplateArgumentListInfo TemplateArgs; | ||||
8906 | |||||
8907 | bool isVirtualOkay = false; | ||||
8908 | |||||
8909 | DeclContext *OriginalDC = DC; | ||||
8910 | bool IsLocalExternDecl = adjustContextForLocalExternDecl(DC); | ||||
8911 | |||||
8912 | FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, | ||||
8913 | isVirtualOkay); | ||||
8914 | if (!NewFD) return nullptr; | ||||
8915 | |||||
8916 | if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) | ||||
8917 | NewFD->setTopLevelDeclInObjCContainer(); | ||||
8918 | |||||
8919 | // Set the lexical context. If this is a function-scope declaration, or has a | ||||
8920 | // C++ scope specifier, or is the object of a friend declaration, the lexical | ||||
8921 | // context will be different from the semantic context. | ||||
8922 | NewFD->setLexicalDeclContext(CurContext); | ||||
8923 | |||||
8924 | if (IsLocalExternDecl) | ||||
8925 | NewFD->setLocalExternDecl(); | ||||
8926 | |||||
8927 | if (getLangOpts().CPlusPlus) { | ||||
8928 | bool isInline = D.getDeclSpec().isInlineSpecified(); | ||||
8929 | bool isVirtual = D.getDeclSpec().isVirtualSpecified(); | ||||
8930 | bool hasExplicit = D.getDeclSpec().hasExplicitSpecifier(); | ||||
8931 | isFriend = D.getDeclSpec().isFriendSpecified(); | ||||
8932 | if (isFriend && !isInline && D.isFunctionDefinition()) { | ||||
8933 | // C++ [class.friend]p5 | ||||
8934 | // A function can be defined in a friend declaration of a | ||||
8935 | // class . . . . Such a function is implicitly inline. | ||||
8936 | NewFD->setImplicitlyInline(); | ||||
8937 | } | ||||
8938 | |||||
8939 | // If this is a method defined in an __interface, and is not a constructor | ||||
8940 | // or an overloaded operator, then set the pure flag (isVirtual will already | ||||
8941 | // return true). | ||||
8942 | if (const CXXRecordDecl *Parent = | ||||
8943 | dyn_cast<CXXRecordDecl>(NewFD->getDeclContext())) { | ||||
8944 | if (Parent->isInterface() && cast<CXXMethodDecl>(NewFD)->isUserProvided()) | ||||
8945 | NewFD->setPure(true); | ||||
8946 | |||||
8947 | // C++ [class.union]p2 | ||||
8948 | // A union can have member functions, but not virtual functions. | ||||
8949 | if (isVirtual && Parent->isUnion()) | ||||
8950 | Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_in_union); | ||||
8951 | } | ||||
8952 | |||||
8953 | SetNestedNameSpecifier(*this, NewFD, D); | ||||
8954 | isMemberSpecialization = false; | ||||
8955 | isFunctionTemplateSpecialization = false; | ||||
8956 | if (D.isInvalidType()) | ||||
8957 | NewFD->setInvalidDecl(); | ||||
8958 | |||||
8959 | // Match up the template parameter lists with the scope specifier, then | ||||
8960 | // determine whether we have a template or a template specialization. | ||||
8961 | bool Invalid = false; | ||||
8962 | TemplateParameterList *TemplateParams = | ||||
8963 | MatchTemplateParametersToScopeSpecifier( | ||||
8964 | D.getDeclSpec().getBeginLoc(), D.getIdentifierLoc(), | ||||
8965 | D.getCXXScopeSpec(), | ||||
8966 | D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId | ||||
8967 | ? D.getName().TemplateId | ||||
8968 | : nullptr, | ||||
8969 | TemplateParamLists, isFriend, isMemberSpecialization, | ||||
8970 | Invalid); | ||||
8971 | if (TemplateParams) { | ||||
8972 | // Check that we can declare a template here. | ||||
8973 | if (CheckTemplateDeclScope(S, TemplateParams)) | ||||
8974 | NewFD->setInvalidDecl(); | ||||
8975 | |||||
8976 | if (TemplateParams->size() > 0) { | ||||
8977 | // This is a function template | ||||
8978 | |||||
8979 | // A destructor cannot be a template. | ||||
8980 | if (Name.getNameKind() == DeclarationName::CXXDestructorName) { | ||||
8981 | Diag(NewFD->getLocation(), diag::err_destructor_template); | ||||
8982 | NewFD->setInvalidDecl(); | ||||
8983 | } | ||||
8984 | |||||
8985 | // If we're adding a template to a dependent context, we may need to | ||||
8986 | // rebuilding some of the types used within the template parameter list, | ||||
8987 | // now that we know what the current instantiation is. | ||||
8988 | if (DC->isDependentContext()) { | ||||
8989 | ContextRAII SavedContext(*this, DC); | ||||
8990 | if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) | ||||
8991 | Invalid = true; | ||||
8992 | } | ||||
8993 | |||||
8994 | FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, | ||||
8995 | NewFD->getLocation(), | ||||
8996 | Name, TemplateParams, | ||||
8997 | NewFD); | ||||
8998 | FunctionTemplate->setLexicalDeclContext(CurContext); | ||||
8999 | NewFD->setDescribedFunctionTemplate(FunctionTemplate); | ||||
9000 | |||||
9001 | // For source fidelity, store the other template param lists. | ||||
9002 | if (TemplateParamLists.size() > 1) { | ||||
9003 | NewFD->setTemplateParameterListsInfo(Context, | ||||
9004 | ArrayRef<TemplateParameterList *>(TemplateParamLists) | ||||
9005 | .drop_back(1)); | ||||
9006 | } | ||||
9007 | } else { | ||||
9008 | // This is a function template specialization. | ||||
9009 | isFunctionTemplateSpecialization = true; | ||||
9010 | // For source fidelity, store all the template param lists. | ||||
9011 | if (TemplateParamLists.size() > 0) | ||||
9012 | NewFD->setTemplateParameterListsInfo(Context, TemplateParamLists); | ||||
9013 | |||||
9014 | // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". | ||||
9015 | if (isFriend) { | ||||
9016 | // We want to remove the "template<>", found here. | ||||
9017 | SourceRange RemoveRange = TemplateParams->getSourceRange(); | ||||
9018 | |||||
9019 | // If we remove the template<> and the name is not a | ||||
9020 | // template-id, we're actually silently creating a problem: | ||||
9021 | // the friend declaration will refer to an untemplated decl, | ||||
9022 | // and clearly the user wants a template specialization. So | ||||
9023 | // we need to insert '<>' after the name. | ||||
9024 | SourceLocation InsertLoc; | ||||
9025 | if (D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId) { | ||||
9026 | InsertLoc = D.getName().getSourceRange().getEnd(); | ||||
9027 | InsertLoc = getLocForEndOfToken(InsertLoc); | ||||
9028 | } | ||||
9029 | |||||
9030 | Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) | ||||
9031 | << Name << RemoveRange | ||||
9032 | << FixItHint::CreateRemoval(RemoveRange) | ||||
9033 | << FixItHint::CreateInsertion(InsertLoc, "<>"); | ||||
9034 | } | ||||
9035 | } | ||||
9036 | } else { | ||||
9037 | // Check that we can declare a template here. | ||||
9038 | if (!TemplateParamLists.empty() && isMemberSpecialization && | ||||
9039 | CheckTemplateDeclScope(S, TemplateParamLists.back())) | ||||
9040 | NewFD->setInvalidDecl(); | ||||
9041 | |||||
9042 | // All template param lists were matched against the scope specifier: | ||||
9043 | // this is NOT (an explicit specialization of) a template. | ||||
9044 | if (TemplateParamLists.size() > 0) | ||||
9045 | // For source fidelity, store all the template param lists. | ||||
9046 | NewFD->setTemplateParameterListsInfo(Context, TemplateParamLists); | ||||
9047 | } | ||||
9048 | |||||
9049 | if (Invalid) { | ||||
9050 | NewFD->setInvalidDecl(); | ||||
9051 | if (FunctionTemplate) | ||||
9052 | FunctionTemplate->setInvalidDecl(); | ||||
9053 | } | ||||
9054 | |||||
9055 | // C++ [dcl.fct.spec]p5: | ||||
9056 | // The virtual specifier shall only be used in declarations of | ||||
9057 | // nonstatic class member functions that appear within a | ||||
9058 | // member-specification of a class declaration; see 10.3. | ||||
9059 | // | ||||
9060 | if (isVirtual && !NewFD->isInvalidDecl()) { | ||||
9061 | if (!isVirtualOkay) { | ||||
9062 | Diag(D.getDeclSpec().getVirtualSpecLoc(), | ||||
9063 | diag::err_virtual_non_function); | ||||
9064 | } else if (!CurContext->isRecord()) { | ||||
9065 | // 'virtual' was specified outside of the class. | ||||
9066 | Diag(D.getDeclSpec().getVirtualSpecLoc(), | ||||
9067 | diag::err_virtual_out_of_class) | ||||
9068 | << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); | ||||
9069 | } else if (NewFD->getDescribedFunctionTemplate()) { | ||||
9070 | // C++ [temp.mem]p3: | ||||
9071 | // A member function template shall not be virtual. | ||||
9072 | Diag(D.getDeclSpec().getVirtualSpecLoc(), | ||||
9073 | diag::err_virtual_member_function_template) | ||||
9074 | << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); | ||||
9075 | } else { | ||||
9076 | // Okay: Add virtual to the method. | ||||
9077 | NewFD->setVirtualAsWritten(true); | ||||
9078 | } | ||||
9079 | |||||
9080 | if (getLangOpts().CPlusPlus14 && | ||||
9081 | NewFD->getReturnType()->isUndeducedType()) | ||||
9082 | Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_auto_fn_virtual); | ||||
9083 | } | ||||
9084 | |||||
9085 | if (getLangOpts().CPlusPlus14 && | ||||
9086 | (NewFD->isDependentContext() || | ||||
9087 | (isFriend && CurContext->isDependentContext())) && | ||||
9088 | NewFD->getReturnType()->isUndeducedType()) { | ||||
9089 | // If the function template is referenced directly (for instance, as a | ||||
9090 | // member of the current instantiation), pretend it has a dependent type. | ||||
9091 | // This is not really justified by the standard, but is the only sane | ||||
9092 | // thing to do. | ||||
9093 | // FIXME: For a friend function, we have not marked the function as being | ||||
9094 | // a friend yet, so 'isDependentContext' on the FD doesn't work. | ||||
9095 | const FunctionProtoType *FPT = | ||||
9096 | NewFD->getType()->castAs<FunctionProtoType>(); | ||||
9097 | QualType Result = | ||||
9098 | SubstAutoType(FPT->getReturnType(), Context.DependentTy); | ||||
9099 | NewFD->setType(Context.getFunctionType(Result, FPT->getParamTypes(), | ||||
9100 | FPT->getExtProtoInfo())); | ||||
9101 | } | ||||
9102 | |||||
9103 | // C++ [dcl.fct.spec]p3: | ||||
9104 | // The inline specifier shall not appear on a block scope function | ||||
9105 | // declaration. | ||||
9106 | if (isInline && !NewFD->isInvalidDecl()) { | ||||
9107 | if (CurContext->isFunctionOrMethod()) { | ||||
9108 | // 'inline' is not allowed on block scope function declaration. | ||||
9109 | Diag(D.getDeclSpec().getInlineSpecLoc(), | ||||
9110 | diag::err_inline_declaration_block_scope) << Name | ||||
9111 | << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); | ||||
9112 | } | ||||
9113 | } | ||||
9114 | |||||
9115 | // C++ [dcl.fct.spec]p6: | ||||
9116 | // The explicit specifier shall be used only in the declaration of a | ||||
9117 | // constructor or conversion function within its class definition; | ||||
9118 | // see 12.3.1 and 12.3.2. | ||||
9119 | if (hasExplicit && !NewFD->isInvalidDecl() && | ||||
9120 | !isa<CXXDeductionGuideDecl>(NewFD)) { | ||||
9121 | if (!CurContext->isRecord()) { | ||||
9122 | // 'explicit' was specified outside of the class. | ||||
9123 | Diag(D.getDeclSpec().getExplicitSpecLoc(), | ||||
9124 | diag::err_explicit_out_of_class) | ||||
9125 | << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecRange()); | ||||
9126 | } else if (!isa<CXXConstructorDecl>(NewFD) && | ||||
9127 | !isa<CXXConversionDecl>(NewFD)) { | ||||
9128 | // 'explicit' was specified on a function that wasn't a constructor | ||||
9129 | // or conversion function. | ||||
9130 | Diag(D.getDeclSpec().getExplicitSpecLoc(), | ||||
9131 | diag::err_explicit_non_ctor_or_conv_function) | ||||
9132 | << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecRange()); | ||||
9133 | } | ||||
9134 | } | ||||
9135 | |||||
9136 | ConstexprSpecKind ConstexprKind = D.getDeclSpec().getConstexprSpecifier(); | ||||
9137 | if (ConstexprKind != ConstexprSpecKind::Unspecified) { | ||||
9138 | // C++11 [dcl.constexpr]p2: constexpr functions and constexpr constructors | ||||
9139 | // are implicitly inline. | ||||
9140 | NewFD->setImplicitlyInline(); | ||||
9141 | |||||
9142 | // C++11 [dcl.constexpr]p3: functions declared constexpr are required to | ||||
9143 | // be either constructors or to return a literal type. Therefore, | ||||
9144 | // destructors cannot be declared constexpr. | ||||
9145 | if (isa<CXXDestructorDecl>(NewFD) && | ||||
9146 | (!getLangOpts().CPlusPlus20 || | ||||
9147 | ConstexprKind == ConstexprSpecKind::Consteval)) { | ||||
9148 | Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor) | ||||
9149 | << static_cast<int>(ConstexprKind); | ||||
9150 | NewFD->setConstexprKind(getLangOpts().CPlusPlus20 | ||||
9151 | ? ConstexprSpecKind::Unspecified | ||||
9152 | : ConstexprSpecKind::Constexpr); | ||||
9153 | } | ||||
9154 | // C++20 [dcl.constexpr]p2: An allocation function, or a | ||||
9155 | // deallocation function shall not be declared with the consteval | ||||
9156 | // specifier. | ||||
9157 | if (ConstexprKind == ConstexprSpecKind::Consteval && | ||||
9158 | (NewFD->getOverloadedOperator() == OO_New || | ||||
9159 | NewFD->getOverloadedOperator() == OO_Array_New || | ||||
9160 | NewFD->getOverloadedOperator() == OO_Delete || | ||||
9161 | NewFD->getOverloadedOperator() == OO_Array_Delete)) { | ||||
9162 | Diag(D.getDeclSpec().getConstexprSpecLoc(), | ||||
9163 | diag::err_invalid_consteval_decl_kind) | ||||
9164 | << NewFD; | ||||
9165 | NewFD->setConstexprKind(ConstexprSpecKind::Constexpr); | ||||
9166 | } | ||||
9167 | } | ||||
9168 | |||||
9169 | // If __module_private__ was specified, mark the function accordingly. | ||||
9170 | if (D.getDeclSpec().isModulePrivateSpecified()) { | ||||
9171 | if (isFunctionTemplateSpecialization) { | ||||
9172 | SourceLocation ModulePrivateLoc | ||||
9173 | = D.getDeclSpec().getModulePrivateSpecLoc(); | ||||
9174 | Diag(ModulePrivateLoc, diag::err_module_private_specialization) | ||||
9175 | << 0 | ||||
9176 | << FixItHint::CreateRemoval(ModulePrivateLoc); | ||||
9177 | } else { | ||||
9178 | NewFD->setModulePrivate(); | ||||
9179 | if (FunctionTemplate) | ||||
9180 | FunctionTemplate->setModulePrivate(); | ||||
9181 | } | ||||
9182 | } | ||||
9183 | |||||
9184 | if (isFriend) { | ||||
9185 | if (FunctionTemplate) { | ||||
9186 | FunctionTemplate->setObjectOfFriendDecl(); | ||||
9187 | FunctionTemplate->setAccess(AS_public); | ||||
9188 | } | ||||
9189 | NewFD->setObjectOfFriendDecl(); | ||||
9190 | NewFD->setAccess(AS_public); | ||||
9191 | } | ||||
9192 | |||||
9193 | // If a function is defined as defaulted or deleted, mark it as such now. | ||||
9194 | // We'll do the relevant checks on defaulted / deleted functions later. | ||||
9195 | switch (D.getFunctionDefinitionKind()) { | ||||
9196 | case FunctionDefinitionKind::Declaration: | ||||
9197 | case FunctionDefinitionKind::Definition: | ||||
9198 | break; | ||||
9199 | |||||
9200 | case FunctionDefinitionKind::Defaulted: | ||||
9201 | NewFD->setDefaulted(); | ||||
9202 | break; | ||||
9203 | |||||
9204 | case FunctionDefinitionKind::Deleted: | ||||
9205 | NewFD->setDeletedAsWritten(); | ||||
9206 | break; | ||||
9207 | } | ||||
9208 | |||||
9209 | if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && | ||||
9210 | D.isFunctionDefinition()) { | ||||
9211 | // C++ [class.mfct]p2: | ||||
9212 | // A member function may be defined (8.4) in its class definition, in | ||||
9213 | // which case it is an inline member function (7.1.2) | ||||
9214 | NewFD->setImplicitlyInline(); | ||||
9215 | } | ||||
9216 | |||||
9217 | if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && | ||||
9218 | !CurContext->isRecord()) { | ||||
9219 | // C++ [class.static]p1: | ||||
9220 | // A data or function member of a class may be declared static | ||||
9221 | // in a class definition, in which case it is a static member of | ||||
9222 | // the class. | ||||
9223 | |||||
9224 | // Complain about the 'static' specifier if it's on an out-of-line | ||||
9225 | // member function definition. | ||||
9226 | |||||
9227 | // MSVC permits the use of a 'static' storage specifier on an out-of-line | ||||
9228 | // member function template declaration and class member template | ||||
9229 | // declaration (MSVC versions before 2015), warn about this. | ||||
9230 | Diag(D.getDeclSpec().getStorageClassSpecLoc(), | ||||
9231 | ((!getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) && | ||||
9232 | cast<CXXRecordDecl>(DC)->getDescribedClassTemplate()) || | ||||
9233 | (getLangOpts().MSVCCompat && NewFD->getDescribedFunctionTemplate())) | ||||
9234 | ? diag::ext_static_out_of_line : diag::err_static_out_of_line) | ||||
9235 | << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); | ||||
9236 | } | ||||
9237 | |||||
9238 | // C++11 [except.spec]p15: | ||||
9239 | // A deallocation function with no exception-specification is treated | ||||
9240 | // as if it were specified with noexcept(true). | ||||
9241 | const FunctionProtoType *FPT = R->getAs<FunctionProtoType>(); | ||||
9242 | if ((Name.getCXXOverloadedOperator() == OO_Delete || | ||||
9243 | Name.getCXXOverloadedOperator() == OO_Array_Delete) && | ||||
9244 | getLangOpts().CPlusPlus11 && FPT && !FPT->hasExceptionSpec()) | ||||
9245 | NewFD->setType(Context.getFunctionType( | ||||
9246 | FPT->getReturnType(), FPT->getParamTypes(), | ||||
9247 | FPT->getExtProtoInfo().withExceptionSpec(EST_BasicNoexcept))); | ||||
9248 | } | ||||
9249 | |||||
9250 | // Filter out previous declarations that don't match the scope. | ||||
9251 | FilterLookupForScope(Previous, OriginalDC, S, shouldConsiderLinkage(NewFD), | ||||
9252 | D.getCXXScopeSpec().isNotEmpty() || | ||||
9253 | isMemberSpecialization || | ||||
9254 | isFunctionTemplateSpecialization); | ||||
9255 | |||||
9256 | // Handle GNU asm-label extension (encoded as an attribute). | ||||
9257 | if (Expr *E = (Expr*) D.getAsmLabel()) { | ||||
9258 | // The parser guarantees this is a string. | ||||
9259 | StringLiteral *SE = cast<StringLiteral>(E); | ||||
9260 | NewFD->addAttr(AsmLabelAttr::Create(Context, SE->getString(), | ||||
9261 | /*IsLiteralLabel=*/true, | ||||
9262 | SE->getStrTokenLoc(0))); | ||||
9263 | } else if (!ExtnameUndeclaredIdentifiers.empty()) { | ||||
9264 | llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = | ||||
9265 | ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); | ||||
9266 | if (I != ExtnameUndeclaredIdentifiers.end()) { | ||||
9267 | if (isDeclExternC(NewFD)) { | ||||
9268 | NewFD->addAttr(I->second); | ||||
9269 | ExtnameUndeclaredIdentifiers.erase(I); | ||||
9270 | } else | ||||
9271 | Diag(NewFD->getLocation(), diag::warn_redefine_extname_not_applied) | ||||
9272 | << /*Variable*/0 << NewFD; | ||||
9273 | } | ||||
9274 | } | ||||
9275 | |||||
9276 | // Copy the parameter declarations from the declarator D to the function | ||||
9277 | // declaration NewFD, if they are available. First scavenge them into Params. | ||||
9278 | SmallVector<ParmVarDecl*, 16> Params; | ||||
9279 | unsigned FTIIdx; | ||||
9280 | if (D.isFunctionDeclarator(FTIIdx)) { | ||||
9281 | DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(FTIIdx).Fun; | ||||
9282 | |||||
9283 | // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs | ||||
9284 | // function that takes no arguments, not a function that takes a | ||||
9285 | // single void argument. | ||||
9286 | // We let through "const void" here because Sema::GetTypeForDeclarator | ||||
9287 | // already checks for that case. | ||||
9288 | if (FTIHasNonVoidParameters(FTI) && FTI.Params[0].Param) { | ||||
9289 | for (unsigned i = 0, e = FTI.NumParams; i != e; ++i) { | ||||
9290 | ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param); | ||||
9291 | assert(Param->getDeclContext() != NewFD && "Was set before ?")((Param->getDeclContext() != NewFD && "Was set before ?" ) ? static_cast<void> (0) : __assert_fail ("Param->getDeclContext() != NewFD && \"Was set before ?\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9291, __PRETTY_FUNCTION__)); | ||||
9292 | Param->setDeclContext(NewFD); | ||||
9293 | Params.push_back(Param); | ||||
9294 | |||||
9295 | if (Param->isInvalidDecl()) | ||||
9296 | NewFD->setInvalidDecl(); | ||||
9297 | } | ||||
9298 | } | ||||
9299 | |||||
9300 | if (!getLangOpts().CPlusPlus) { | ||||
9301 | // In C, find all the tag declarations from the prototype and move them | ||||
9302 | // into the function DeclContext. Remove them from the surrounding tag | ||||
9303 | // injection context of the function, which is typically but not always | ||||
9304 | // the TU. | ||||
9305 | DeclContext *PrototypeTagContext = | ||||
9306 | getTagInjectionContext(NewFD->getLexicalDeclContext()); | ||||
9307 | for (NamedDecl *NonParmDecl : FTI.getDeclsInPrototype()) { | ||||
9308 | auto *TD = dyn_cast<TagDecl>(NonParmDecl); | ||||
9309 | |||||
9310 | // We don't want to reparent enumerators. Look at their parent enum | ||||
9311 | // instead. | ||||
9312 | if (!TD) { | ||||
9313 | if (auto *ECD = dyn_cast<EnumConstantDecl>(NonParmDecl)) | ||||
9314 | TD = cast<EnumDecl>(ECD->getDeclContext()); | ||||
9315 | } | ||||
9316 | if (!TD) | ||||
9317 | continue; | ||||
9318 | DeclContext *TagDC = TD->getLexicalDeclContext(); | ||||
9319 | if (!TagDC->containsDecl(TD)) | ||||
9320 | continue; | ||||
9321 | TagDC->removeDecl(TD); | ||||
9322 | TD->setDeclContext(NewFD); | ||||
9323 | NewFD->addDecl(TD); | ||||
9324 | |||||
9325 | // Preserve the lexical DeclContext if it is not the surrounding tag | ||||
9326 | // injection context of the FD. In this example, the semantic context of | ||||
9327 | // E will be f and the lexical context will be S, while both the | ||||
9328 | // semantic and lexical contexts of S will be f: | ||||
9329 | // void f(struct S { enum E { a } f; } s); | ||||
9330 | if (TagDC != PrototypeTagContext) | ||||
9331 | TD->setLexicalDeclContext(TagDC); | ||||
9332 | } | ||||
9333 | } | ||||
9334 | } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { | ||||
9335 | // When we're declaring a function with a typedef, typeof, etc as in the | ||||
9336 | // following example, we'll need to synthesize (unnamed) | ||||
9337 | // parameters for use in the declaration. | ||||
9338 | // | ||||
9339 | // @code | ||||
9340 | // typedef void fn(int); | ||||
9341 | // fn f; | ||||
9342 | // @endcode | ||||
9343 | |||||
9344 | // Synthesize a parameter for each argument type. | ||||
9345 | for (const auto &AI : FT->param_types()) { | ||||
9346 | ParmVarDecl *Param = | ||||
9347 | BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), AI); | ||||
9348 | Param->setScopeInfo(0, Params.size()); | ||||
9349 | Params.push_back(Param); | ||||
9350 | } | ||||
9351 | } else { | ||||
9352 | assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 &&((R->isFunctionNoProtoType() && NewFD->getNumParams () == 0 && "Should not need args for typedef of non-prototype fn" ) ? static_cast<void> (0) : __assert_fail ("R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && \"Should not need args for typedef of non-prototype fn\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9353, __PRETTY_FUNCTION__)) | ||||
9353 | "Should not need args for typedef of non-prototype fn")((R->isFunctionNoProtoType() && NewFD->getNumParams () == 0 && "Should not need args for typedef of non-prototype fn" ) ? static_cast<void> (0) : __assert_fail ("R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && \"Should not need args for typedef of non-prototype fn\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9353, __PRETTY_FUNCTION__)); | ||||
9354 | } | ||||
9355 | |||||
9356 | // Finally, we know we have the right number of parameters, install them. | ||||
9357 | NewFD->setParams(Params); | ||||
9358 | |||||
9359 | if (D.getDeclSpec().isNoreturnSpecified()) | ||||
9360 | NewFD->addAttr(C11NoReturnAttr::Create(Context, | ||||
9361 | D.getDeclSpec().getNoreturnSpecLoc(), | ||||
9362 | AttributeCommonInfo::AS_Keyword)); | ||||
9363 | |||||
9364 | // Functions returning a variably modified type violate C99 6.7.5.2p2 | ||||
9365 | // because all functions have linkage. | ||||
9366 | if (!NewFD->isInvalidDecl() && | ||||
9367 | NewFD->getReturnType()->isVariablyModifiedType()) { | ||||
9368 | Diag(NewFD->getLocation(), diag::err_vm_func_decl); | ||||
9369 | NewFD->setInvalidDecl(); | ||||
9370 | } | ||||
9371 | |||||
9372 | // Apply an implicit SectionAttr if '#pragma clang section text' is active | ||||
9373 | if (PragmaClangTextSection.Valid && D.isFunctionDefinition() && | ||||
9374 | !NewFD->hasAttr<SectionAttr>()) | ||||
9375 | NewFD->addAttr(PragmaClangTextSectionAttr::CreateImplicit( | ||||
9376 | Context, PragmaClangTextSection.SectionName, | ||||
9377 | PragmaClangTextSection.PragmaLocation, AttributeCommonInfo::AS_Pragma)); | ||||
9378 | |||||
9379 | // Apply an implicit SectionAttr if #pragma code_seg is active. | ||||
9380 | if (CodeSegStack.CurrentValue && D.isFunctionDefinition() && | ||||
9381 | !NewFD->hasAttr<SectionAttr>()) { | ||||
9382 | NewFD->addAttr(SectionAttr::CreateImplicit( | ||||
9383 | Context, CodeSegStack.CurrentValue->getString(), | ||||
9384 | CodeSegStack.CurrentPragmaLocation, AttributeCommonInfo::AS_Pragma, | ||||
9385 | SectionAttr::Declspec_allocate)); | ||||
9386 | if (UnifySection(CodeSegStack.CurrentValue->getString(), | ||||
9387 | ASTContext::PSF_Implicit | ASTContext::PSF_Execute | | ||||
9388 | ASTContext::PSF_Read, | ||||
9389 | NewFD)) | ||||
9390 | NewFD->dropAttr<SectionAttr>(); | ||||
9391 | } | ||||
9392 | |||||
9393 | // Apply an implicit CodeSegAttr from class declspec or | ||||
9394 | // apply an implicit SectionAttr from #pragma code_seg if active. | ||||
9395 | if (!NewFD->hasAttr<CodeSegAttr>()) { | ||||
9396 | if (Attr *SAttr = getImplicitCodeSegOrSectionAttrForFunction(NewFD, | ||||
9397 | D.isFunctionDefinition())) { | ||||
9398 | NewFD->addAttr(SAttr); | ||||
9399 | } | ||||
9400 | } | ||||
9401 | |||||
9402 | // Handle attributes. | ||||
9403 | ProcessDeclAttributes(S, NewFD, D); | ||||
9404 | |||||
9405 | if (getLangOpts().OpenCL) { | ||||
9406 | // OpenCL v1.1 s6.5: Using an address space qualifier in a function return | ||||
9407 | // type declaration will generate a compilation error. | ||||
9408 | LangAS AddressSpace = NewFD->getReturnType().getAddressSpace(); | ||||
9409 | if (AddressSpace != LangAS::Default) { | ||||
9410 | Diag(NewFD->getLocation(), | ||||
9411 | diag::err_opencl_return_value_with_address_space); | ||||
9412 | NewFD->setInvalidDecl(); | ||||
9413 | } | ||||
9414 | } | ||||
9415 | |||||
9416 | if (!getLangOpts().CPlusPlus) { | ||||
9417 | // Perform semantic checking on the function declaration. | ||||
9418 | if (!NewFD->isInvalidDecl() && NewFD->isMain()) | ||||
9419 | CheckMain(NewFD, D.getDeclSpec()); | ||||
9420 | |||||
9421 | if (!NewFD->isInvalidDecl() && NewFD->isMSVCRTEntryPoint()) | ||||
9422 | CheckMSVCRTEntryPoint(NewFD); | ||||
9423 | |||||
9424 | if (!NewFD->isInvalidDecl()) | ||||
9425 | D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, | ||||
9426 | isMemberSpecialization)); | ||||
9427 | else if (!Previous.empty()) | ||||
9428 | // Recover gracefully from an invalid redeclaration. | ||||
9429 | D.setRedeclaration(true); | ||||
9430 | assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||(((NewFD->isInvalidDecl() || !D.isRedeclaration() || Previous .getResultKind() != LookupResult::FoundOverloaded) && "previous declaration set still overloaded") ? static_cast< void> (0) : __assert_fail ("(NewFD->isInvalidDecl() || !D.isRedeclaration() || Previous.getResultKind() != LookupResult::FoundOverloaded) && \"previous declaration set still overloaded\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9432, __PRETTY_FUNCTION__)) | ||||
9431 | Previous.getResultKind() != LookupResult::FoundOverloaded) &&(((NewFD->isInvalidDecl() || !D.isRedeclaration() || Previous .getResultKind() != LookupResult::FoundOverloaded) && "previous declaration set still overloaded") ? static_cast< void> (0) : __assert_fail ("(NewFD->isInvalidDecl() || !D.isRedeclaration() || Previous.getResultKind() != LookupResult::FoundOverloaded) && \"previous declaration set still overloaded\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9432, __PRETTY_FUNCTION__)) | ||||
9432 | "previous declaration set still overloaded")(((NewFD->isInvalidDecl() || !D.isRedeclaration() || Previous .getResultKind() != LookupResult::FoundOverloaded) && "previous declaration set still overloaded") ? static_cast< void> (0) : __assert_fail ("(NewFD->isInvalidDecl() || !D.isRedeclaration() || Previous.getResultKind() != LookupResult::FoundOverloaded) && \"previous declaration set still overloaded\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9432, __PRETTY_FUNCTION__)); | ||||
9433 | |||||
9434 | // Diagnose no-prototype function declarations with calling conventions that | ||||
9435 | // don't support variadic calls. Only do this in C and do it after merging | ||||
9436 | // possibly prototyped redeclarations. | ||||
9437 | const FunctionType *FT = NewFD->getType()->castAs<FunctionType>(); | ||||
9438 | if (isa<FunctionNoProtoType>(FT) && !D.isFunctionDefinition()) { | ||||
9439 | CallingConv CC = FT->getExtInfo().getCC(); | ||||
9440 | if (!supportsVariadicCall(CC)) { | ||||
9441 | // Windows system headers sometimes accidentally use stdcall without | ||||
9442 | // (void) parameters, so we relax this to a warning. | ||||
9443 | int DiagID = | ||||
9444 | CC == CC_X86StdCall ? diag::warn_cconv_knr : diag::err_cconv_knr; | ||||
9445 | Diag(NewFD->getLocation(), DiagID) | ||||
9446 | << FunctionType::getNameForCallConv(CC); | ||||
9447 | } | ||||
9448 | } | ||||
9449 | |||||
9450 | if (NewFD->getReturnType().hasNonTrivialToPrimitiveDestructCUnion() || | ||||
9451 | NewFD->getReturnType().hasNonTrivialToPrimitiveCopyCUnion()) | ||||
9452 | checkNonTrivialCUnion(NewFD->getReturnType(), | ||||
9453 | NewFD->getReturnTypeSourceRange().getBegin(), | ||||
9454 | NTCUC_FunctionReturn, NTCUK_Destruct|NTCUK_Copy); | ||||
9455 | } else { | ||||
9456 | // C++11 [replacement.functions]p3: | ||||
9457 | // The program's definitions shall not be specified as inline. | ||||
9458 | // | ||||
9459 | // N.B. We diagnose declarations instead of definitions per LWG issue 2340. | ||||
9460 | // | ||||
9461 | // Suppress the diagnostic if the function is __attribute__((used)), since | ||||
9462 | // that forces an external definition to be emitted. | ||||
9463 | if (D.getDeclSpec().isInlineSpecified() && | ||||
9464 | NewFD->isReplaceableGlobalAllocationFunction() && | ||||
9465 | !NewFD->hasAttr<UsedAttr>()) | ||||
9466 | Diag(D.getDeclSpec().getInlineSpecLoc(), | ||||
9467 | diag::ext_operator_new_delete_declared_inline) | ||||
9468 | << NewFD->getDeclName(); | ||||
9469 | |||||
9470 | // If the declarator is a template-id, translate the parser's template | ||||
9471 | // argument list into our AST format. | ||||
9472 | if (D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId) { | ||||
9473 | TemplateIdAnnotation *TemplateId = D.getName().TemplateId; | ||||
9474 | TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); | ||||
9475 | TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); | ||||
9476 | ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(), | ||||
9477 | TemplateId->NumArgs); | ||||
9478 | translateTemplateArguments(TemplateArgsPtr, | ||||
9479 | TemplateArgs); | ||||
9480 | |||||
9481 | HasExplicitTemplateArgs = true; | ||||
9482 | |||||
9483 | if (NewFD->isInvalidDecl()) { | ||||
9484 | HasExplicitTemplateArgs = false; | ||||
9485 | } else if (FunctionTemplate) { | ||||
9486 | // Function template with explicit template arguments. | ||||
9487 | Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) | ||||
9488 | << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); | ||||
9489 | |||||
9490 | HasExplicitTemplateArgs = false; | ||||
9491 | } else { | ||||
9492 | assert((isFunctionTemplateSpecialization ||(((isFunctionTemplateSpecialization || D.getDeclSpec().isFriendSpecified ()) && "should have a 'template<>' for this decl" ) ? static_cast<void> (0) : __assert_fail ("(isFunctionTemplateSpecialization || D.getDeclSpec().isFriendSpecified()) && \"should have a 'template<>' for this decl\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9494, __PRETTY_FUNCTION__)) | ||||
9493 | D.getDeclSpec().isFriendSpecified()) &&(((isFunctionTemplateSpecialization || D.getDeclSpec().isFriendSpecified ()) && "should have a 'template<>' for this decl" ) ? static_cast<void> (0) : __assert_fail ("(isFunctionTemplateSpecialization || D.getDeclSpec().isFriendSpecified()) && \"should have a 'template<>' for this decl\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9494, __PRETTY_FUNCTION__)) | ||||
9494 | "should have a 'template<>' for this decl")(((isFunctionTemplateSpecialization || D.getDeclSpec().isFriendSpecified ()) && "should have a 'template<>' for this decl" ) ? static_cast<void> (0) : __assert_fail ("(isFunctionTemplateSpecialization || D.getDeclSpec().isFriendSpecified()) && \"should have a 'template<>' for this decl\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9494, __PRETTY_FUNCTION__)); | ||||
9495 | // "friend void foo<>(int);" is an implicit specialization decl. | ||||
9496 | isFunctionTemplateSpecialization = true; | ||||
9497 | } | ||||
9498 | } else if (isFriend && isFunctionTemplateSpecialization) { | ||||
9499 | // This combination is only possible in a recovery case; the user | ||||
9500 | // wrote something like: | ||||
9501 | // template <> friend void foo(int); | ||||
9502 | // which we're recovering from as if the user had written: | ||||
9503 | // friend void foo<>(int); | ||||
9504 | // Go ahead and fake up a template id. | ||||
9505 | HasExplicitTemplateArgs = true; | ||||
9506 | TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); | ||||
9507 | TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); | ||||
9508 | } | ||||
9509 | |||||
9510 | // We do not add HD attributes to specializations here because | ||||
9511 | // they may have different constexpr-ness compared to their | ||||
9512 | // templates and, after maybeAddCUDAHostDeviceAttrs() is applied, | ||||
9513 | // may end up with different effective targets. Instead, a | ||||
9514 | // specialization inherits its target attributes from its template | ||||
9515 | // in the CheckFunctionTemplateSpecialization() call below. | ||||
9516 | if (getLangOpts().CUDA && !isFunctionTemplateSpecialization) | ||||
9517 | maybeAddCUDAHostDeviceAttrs(NewFD, Previous); | ||||
9518 | |||||
9519 | // If it's a friend (and only if it's a friend), it's possible | ||||
9520 | // that either the specialized function type or the specialized | ||||
9521 | // template is dependent, and therefore matching will fail. In | ||||
9522 | // this case, don't check the specialization yet. | ||||
9523 | if (isFunctionTemplateSpecialization && isFriend && | ||||
9524 | (NewFD->getType()->isDependentType() || DC->isDependentContext() || | ||||
9525 | TemplateSpecializationType::anyInstantiationDependentTemplateArguments( | ||||
9526 | TemplateArgs.arguments()))) { | ||||
9527 | assert(HasExplicitTemplateArgs &&((HasExplicitTemplateArgs && "friend function specialization without template args" ) ? static_cast<void> (0) : __assert_fail ("HasExplicitTemplateArgs && \"friend function specialization without template args\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9528, __PRETTY_FUNCTION__)) | ||||
9528 | "friend function specialization without template args")((HasExplicitTemplateArgs && "friend function specialization without template args" ) ? static_cast<void> (0) : __assert_fail ("HasExplicitTemplateArgs && \"friend function specialization without template args\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9528, __PRETTY_FUNCTION__)); | ||||
9529 | if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, | ||||
9530 | Previous)) | ||||
9531 | NewFD->setInvalidDecl(); | ||||
9532 | } else if (isFunctionTemplateSpecialization) { | ||||
9533 | if (CurContext->isDependentContext() && CurContext->isRecord() | ||||
9534 | && !isFriend) { | ||||
9535 | isDependentClassScopeExplicitSpecialization = true; | ||||
9536 | } else if (!NewFD->isInvalidDecl() && | ||||
9537 | CheckFunctionTemplateSpecialization( | ||||
9538 | NewFD, (HasExplicitTemplateArgs ? &TemplateArgs : nullptr), | ||||
9539 | Previous)) | ||||
9540 | NewFD->setInvalidDecl(); | ||||
9541 | |||||
9542 | // C++ [dcl.stc]p1: | ||||
9543 | // A storage-class-specifier shall not be specified in an explicit | ||||
9544 | // specialization (14.7.3) | ||||
9545 | FunctionTemplateSpecializationInfo *Info = | ||||
9546 | NewFD->getTemplateSpecializationInfo(); | ||||
9547 | if (Info && SC != SC_None) { | ||||
9548 | if (SC != Info->getTemplate()->getTemplatedDecl()->getStorageClass()) | ||||
9549 | Diag(NewFD->getLocation(), | ||||
9550 | diag::err_explicit_specialization_inconsistent_storage_class) | ||||
9551 | << SC | ||||
9552 | << FixItHint::CreateRemoval( | ||||
9553 | D.getDeclSpec().getStorageClassSpecLoc()); | ||||
9554 | |||||
9555 | else | ||||
9556 | Diag(NewFD->getLocation(), | ||||
9557 | diag::ext_explicit_specialization_storage_class) | ||||
9558 | << FixItHint::CreateRemoval( | ||||
9559 | D.getDeclSpec().getStorageClassSpecLoc()); | ||||
9560 | } | ||||
9561 | } else if (isMemberSpecialization && isa<CXXMethodDecl>(NewFD)) { | ||||
9562 | if (CheckMemberSpecialization(NewFD, Previous)) | ||||
9563 | NewFD->setInvalidDecl(); | ||||
9564 | } | ||||
9565 | |||||
9566 | // Perform semantic checking on the function declaration. | ||||
9567 | if (!isDependentClassScopeExplicitSpecialization) { | ||||
9568 | if (!NewFD->isInvalidDecl() && NewFD->isMain()) | ||||
9569 | CheckMain(NewFD, D.getDeclSpec()); | ||||
9570 | |||||
9571 | if (!NewFD->isInvalidDecl() && NewFD->isMSVCRTEntryPoint()) | ||||
9572 | CheckMSVCRTEntryPoint(NewFD); | ||||
9573 | |||||
9574 | if (!NewFD->isInvalidDecl()) | ||||
9575 | D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, | ||||
9576 | isMemberSpecialization)); | ||||
9577 | else if (!Previous.empty()) | ||||
9578 | // Recover gracefully from an invalid redeclaration. | ||||
9579 | D.setRedeclaration(true); | ||||
9580 | } | ||||
9581 | |||||
9582 | assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||(((NewFD->isInvalidDecl() || !D.isRedeclaration() || Previous .getResultKind() != LookupResult::FoundOverloaded) && "previous declaration set still overloaded") ? static_cast< void> (0) : __assert_fail ("(NewFD->isInvalidDecl() || !D.isRedeclaration() || Previous.getResultKind() != LookupResult::FoundOverloaded) && \"previous declaration set still overloaded\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9584, __PRETTY_FUNCTION__)) | ||||
9583 | Previous.getResultKind() != LookupResult::FoundOverloaded) &&(((NewFD->isInvalidDecl() || !D.isRedeclaration() || Previous .getResultKind() != LookupResult::FoundOverloaded) && "previous declaration set still overloaded") ? static_cast< void> (0) : __assert_fail ("(NewFD->isInvalidDecl() || !D.isRedeclaration() || Previous.getResultKind() != LookupResult::FoundOverloaded) && \"previous declaration set still overloaded\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9584, __PRETTY_FUNCTION__)) | ||||
9584 | "previous declaration set still overloaded")(((NewFD->isInvalidDecl() || !D.isRedeclaration() || Previous .getResultKind() != LookupResult::FoundOverloaded) && "previous declaration set still overloaded") ? static_cast< void> (0) : __assert_fail ("(NewFD->isInvalidDecl() || !D.isRedeclaration() || Previous.getResultKind() != LookupResult::FoundOverloaded) && \"previous declaration set still overloaded\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 9584, __PRETTY_FUNCTION__)); | ||||
9585 | |||||
9586 | NamedDecl *PrincipalDecl = (FunctionTemplate | ||||
9587 | ? cast<NamedDecl>(FunctionTemplate) | ||||
9588 | : NewFD); | ||||
9589 | |||||
9590 | if (isFriend && NewFD->getPreviousDecl()) { | ||||
9591 | AccessSpecifier Access = AS_public; | ||||
9592 | if (!NewFD->isInvalidDecl()) | ||||
9593 | Access = NewFD->getPreviousDecl()->getAccess(); | ||||
9594 | |||||
9595 | NewFD->setAccess(Access); | ||||
9596 | if (FunctionTemplate) FunctionTemplate->setAccess(Access); | ||||
9597 | } | ||||
9598 | |||||
9599 | if (NewFD->isOverloadedOperator() && !DC->isRecord() && | ||||
9600 | PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) | ||||
9601 | PrincipalDecl->setNonMemberOperator(); | ||||
9602 | |||||
9603 | // If we have a function template, check the template parameter | ||||
9604 | // list. This will check and merge default template arguments. | ||||
9605 | if (FunctionTemplate) { | ||||
9606 | FunctionTemplateDecl *PrevTemplate = | ||||
9607 | FunctionTemplate->getPreviousDecl(); | ||||
9608 | CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), | ||||
9609 | PrevTemplate ? PrevTemplate->getTemplateParameters() | ||||
9610 | : nullptr, | ||||
9611 | D.getDeclSpec().isFriendSpecified() | ||||
9612 | ? (D.isFunctionDefinition() | ||||
9613 | ? TPC_FriendFunctionTemplateDefinition | ||||
9614 | : TPC_FriendFunctionTemplate) | ||||
9615 | : (D.getCXXScopeSpec().isSet() && | ||||
9616 | DC && DC->isRecord() && | ||||
9617 | DC->isDependentContext()) | ||||
9618 | ? TPC_ClassTemplateMember | ||||
9619 | : TPC_FunctionTemplate); | ||||
9620 | } | ||||
9621 | |||||
9622 | if (NewFD->isInvalidDecl()) { | ||||
9623 | // Ignore all the rest of this. | ||||
9624 | } else if (!D.isRedeclaration()) { | ||||
9625 | struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, | ||||
9626 | AddToScope }; | ||||
9627 | // Fake up an access specifier if it's supposed to be a class member. | ||||
9628 | if (isa<CXXRecordDecl>(NewFD->getDeclContext())) | ||||
9629 | NewFD->setAccess(AS_public); | ||||
9630 | |||||
9631 | // Qualified decls generally require a previous declaration. | ||||
9632 | if (D.getCXXScopeSpec().isSet()) { | ||||
9633 | // ...with the major exception of templated-scope or | ||||
9634 | // dependent-scope friend declarations. | ||||
9635 | |||||
9636 | // TODO: we currently also suppress this check in dependent | ||||
9637 | // contexts because (1) the parameter depth will be off when | ||||
9638 | // matching friend templates and (2) we might actually be | ||||
9639 | // selecting a friend based on a dependent factor. But there | ||||
9640 | // are situations where these conditions don't apply and we | ||||
9641 | // can actually do this check immediately. | ||||
9642 | // | ||||
9643 | // Unless the scope is dependent, it's always an error if qualified | ||||
9644 | // redeclaration lookup found nothing at all. Diagnose that now; | ||||
9645 | // nothing will diagnose that error later. | ||||
9646 | if (isFriend && | ||||
9647 | (D.getCXXScopeSpec().getScopeRep()->isDependent() || | ||||
9648 | (!Previous.empty() && CurContext->isDependentContext()))) { | ||||
9649 | // ignore these | ||||
9650 | } else { | ||||
9651 | // The user tried to provide an out-of-line definition for a | ||||
9652 | // function that is a member of a class or namespace, but there | ||||
9653 | // was no such member function declared (C++ [class.mfct]p2, | ||||
9654 | // C++ [namespace.memdef]p2). For example: | ||||
9655 | // | ||||
9656 | // class X { | ||||
9657 | // void f() const; | ||||
9658 | // }; | ||||
9659 | // | ||||
9660 | // void X::f() { } // ill-formed | ||||
9661 | // | ||||
9662 | // Complain about this problem, and attempt to suggest close | ||||
9663 | // matches (e.g., those that differ only in cv-qualifiers and | ||||
9664 | // whether the parameter types are references). | ||||
9665 | |||||
9666 | if (NamedDecl *Result = DiagnoseInvalidRedeclaration( | ||||
9667 | *this, Previous, NewFD, ExtraArgs, false, nullptr)) { | ||||
9668 | AddToScope = ExtraArgs.AddToScope; | ||||
9669 | return Result; | ||||
9670 | } | ||||
9671 | } | ||||
9672 | |||||
9673 | // Unqualified local friend declarations are required to resolve | ||||
9674 | // to something. | ||||
9675 | } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { | ||||
9676 | if (NamedDecl *Result = DiagnoseInvalidRedeclaration( | ||||
9677 | *this, Previous, NewFD, ExtraArgs, true, S)) { | ||||
9678 | AddToScope = ExtraArgs.AddToScope; | ||||
9679 | return Result; | ||||
9680 | } | ||||
9681 | } | ||||
9682 | } else if (!D.isFunctionDefinition() && | ||||
9683 | isa<CXXMethodDecl>(NewFD) && NewFD->isOutOfLine() && | ||||
9684 | !isFriend && !isFunctionTemplateSpecialization && | ||||
9685 | !isMemberSpecialization) { | ||||
9686 | // An out-of-line member function declaration must also be a | ||||
9687 | // definition (C++ [class.mfct]p2). | ||||
9688 | // Note that this is not the case for explicit specializations of | ||||
9689 | // function templates or member functions of class templates, per | ||||
9690 | // C++ [temp.expl.spec]p2. We also allow these declarations as an | ||||
9691 | // extension for compatibility with old SWIG code which likes to | ||||
9692 | // generate them. | ||||
9693 | Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) | ||||
9694 | << D.getCXXScopeSpec().getRange(); | ||||
9695 | } | ||||
9696 | } | ||||
9697 | |||||
9698 | // If this is the first declaration of a library builtin function, add | ||||
9699 | // attributes as appropriate. | ||||
9700 | if (!D.isRedeclaration() && | ||||
9701 | NewFD->getDeclContext()->getRedeclContext()->isFileContext()) { | ||||
9702 | if (IdentifierInfo *II = Previous.getLookupName().getAsIdentifierInfo()) { | ||||
9703 | if (unsigned BuiltinID = II->getBuiltinID()) { | ||||
9704 | if (NewFD->getLanguageLinkage() == CLanguageLinkage) { | ||||
9705 | // Validate the type matches unless this builtin is specified as | ||||
9706 | // matching regardless of its declared type. | ||||
9707 | if (Context.BuiltinInfo.allowTypeMismatch(BuiltinID)) { | ||||
9708 | NewFD->addAttr(BuiltinAttr::CreateImplicit(Context, BuiltinID)); | ||||
9709 | } else { | ||||
9710 | ASTContext::GetBuiltinTypeError Error; | ||||
9711 | LookupNecessaryTypesForBuiltin(S, BuiltinID); | ||||
9712 | QualType BuiltinType = Context.GetBuiltinType(BuiltinID, Error); | ||||
9713 | |||||
9714 | if (!Error && !BuiltinType.isNull() && | ||||
9715 | Context.hasSameFunctionTypeIgnoringExceptionSpec( | ||||
9716 | NewFD->getType(), BuiltinType)) | ||||
9717 | NewFD->addAttr(BuiltinAttr::CreateImplicit(Context, BuiltinID)); | ||||
9718 | } | ||||
9719 | } else if (BuiltinID == Builtin::BI__GetExceptionInfo && | ||||
9720 | Context.getTargetInfo().getCXXABI().isMicrosoft()) { | ||||
9721 | // FIXME: We should consider this a builtin only in the std namespace. | ||||
9722 | NewFD->addAttr(BuiltinAttr::CreateImplicit(Context, BuiltinID)); | ||||
9723 | } | ||||
9724 | } | ||||
9725 | } | ||||
9726 | } | ||||
9727 | |||||
9728 | ProcessPragmaWeak(S, NewFD); | ||||
9729 | checkAttributesAfterMerging(*this, *NewFD); | ||||
9730 | |||||
9731 | AddKnownFunctionAttributes(NewFD); | ||||
9732 | |||||
9733 | if (NewFD->hasAttr<OverloadableAttr>() && | ||||
9734 | !NewFD->getType()->getAs<FunctionProtoType>()) { | ||||
9735 | Diag(NewFD->getLocation(), | ||||
9736 | diag::err_attribute_overloadable_no_prototype) | ||||
9737 | << NewFD; | ||||
9738 | |||||
9739 | // Turn this into a variadic function with no parameters. | ||||
9740 | const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); | ||||
9741 | FunctionProtoType::ExtProtoInfo EPI( | ||||
9742 | Context.getDefaultCallingConvention(true, false)); | ||||
9743 | EPI.Variadic = true; | ||||
9744 | EPI.ExtInfo = FT->getExtInfo(); | ||||
9745 | |||||
9746 | QualType R = Context.getFunctionType(FT->getReturnType(), None, EPI); | ||||
9747 | NewFD->setType(R); | ||||
9748 | } | ||||
9749 | |||||
9750 | // If there's a #pragma GCC visibility in scope, and this isn't a class | ||||
9751 | // member, set the visibility of this function. | ||||
9752 | if (!DC->isRecord() && NewFD->isExternallyVisible()) | ||||
9753 | AddPushedVisibilityAttribute(NewFD); | ||||
9754 | |||||
9755 | // If there's a #pragma clang arc_cf_code_audited in scope, consider | ||||
9756 | // marking the function. | ||||
9757 | AddCFAuditedAttribute(NewFD); | ||||
9758 | |||||
9759 | // If this is a function definition, check if we have to apply optnone due to | ||||
9760 | // a pragma. | ||||
9761 | if(D.isFunctionDefinition()) | ||||
9762 | AddRangeBasedOptnone(NewFD); | ||||
9763 | |||||
9764 | // If this is the first declaration of an extern C variable, update | ||||
9765 | // the map of such variables. | ||||
9766 | if (NewFD->isFirstDecl() && !NewFD->isInvalidDecl() && | ||||
9767 | isIncompleteDeclExternC(*this, NewFD)) | ||||
9768 | RegisterLocallyScopedExternCDecl(NewFD, S); | ||||
9769 | |||||
9770 | // Set this FunctionDecl's range up to the right paren. | ||||
9771 | NewFD->setRangeEnd(D.getSourceRange().getEnd()); | ||||
9772 | |||||
9773 | if (D.isRedeclaration() && !Previous.empty()) { | ||||
9774 | NamedDecl *Prev = Previous.getRepresentativeDecl(); | ||||
9775 | checkDLLAttributeRedeclaration(*this, Prev, NewFD, | ||||
9776 | isMemberSpecialization || | ||||
9777 | isFunctionTemplateSpecialization, | ||||
9778 | D.isFunctionDefinition()); | ||||
9779 | } | ||||
9780 | |||||
9781 | if (getLangOpts().CUDA) { | ||||
9782 | IdentifierInfo *II = NewFD->getIdentifier(); | ||||
9783 | if (II && II->isStr(getCudaConfigureFuncName()) && | ||||
9784 | !NewFD->isInvalidDecl() && | ||||
9785 | NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { | ||||
9786 | if (!R->getAs<FunctionType>()->getReturnType()->isScalarType()) | ||||
9787 | Diag(NewFD->getLocation(), diag::err_config_scalar_return) | ||||
9788 | << getCudaConfigureFuncName(); | ||||
9789 | Context.setcudaConfigureCallDecl(NewFD); | ||||
9790 | } | ||||
9791 | |||||
9792 | // Variadic functions, other than a *declaration* of printf, are not allowed | ||||
9793 | // in device-side CUDA code, unless someone passed | ||||
9794 | // -fcuda-allow-variadic-functions. | ||||
9795 | if (!getLangOpts().CUDAAllowVariadicFunctions && NewFD->isVariadic() && | ||||
9796 | (NewFD->hasAttr<CUDADeviceAttr>() || | ||||
9797 | NewFD->hasAttr<CUDAGlobalAttr>()) && | ||||
9798 | !(II && II->isStr("printf") && NewFD->isExternC() && | ||||
9799 | !D.isFunctionDefinition())) { | ||||
9800 | Diag(NewFD->getLocation(), diag::err_variadic_device_fn); | ||||
9801 | } | ||||
9802 | } | ||||
9803 | |||||
9804 | MarkUnusedFileScopedDecl(NewFD); | ||||
9805 | |||||
9806 | |||||
9807 | |||||
9808 | if (getLangOpts().OpenCL && NewFD->hasAttr<OpenCLKernelAttr>()) { | ||||
9809 | // OpenCL v1.2 s6.8 static is invalid for kernel functions. | ||||
9810 | if ((getLangOpts().OpenCLVersion >= 120) | ||||
9811 | && (SC == SC_Static)) { | ||||
9812 | Diag(D.getIdentifierLoc(), diag::err_static_kernel); | ||||
9813 | D.setInvalidType(); | ||||
9814 | } | ||||
9815 | |||||
9816 | // OpenCL v1.2, s6.9 -- Kernels can only have return type void. | ||||
9817 | if (!NewFD->getReturnType()->isVoidType()) { | ||||
9818 | SourceRange RTRange = NewFD->getReturnTypeSourceRange(); | ||||
9819 | Diag(D.getIdentifierLoc(), diag::err_expected_kernel_void_return_type) | ||||
9820 | << (RTRange.isValid() ? FixItHint::CreateReplacement(RTRange, "void") | ||||
9821 | : FixItHint()); | ||||
9822 | D.setInvalidType(); | ||||
9823 | } | ||||
9824 | |||||
9825 | llvm::SmallPtrSet<const Type *, 16> ValidTypes; | ||||
9826 | for (auto Param : NewFD->parameters()) | ||||
9827 | checkIsValidOpenCLKernelParameter(*this, D, Param, ValidTypes); | ||||
9828 | |||||
9829 | if (getLangOpts().OpenCLCPlusPlus) { | ||||
9830 | if (DC->isRecord()) { | ||||
9831 | Diag(D.getIdentifierLoc(), diag::err_method_kernel); | ||||
9832 | D.setInvalidType(); | ||||
9833 | } | ||||
9834 | if (FunctionTemplate) { | ||||
9835 | Diag(D.getIdentifierLoc(), diag::err_template_kernel); | ||||
9836 | D.setInvalidType(); | ||||
9837 | } | ||||
9838 | } | ||||
9839 | } | ||||
9840 | |||||
9841 | if (getLangOpts().CPlusPlus) { | ||||
9842 | if (FunctionTemplate) { | ||||
9843 | if (NewFD->isInvalidDecl()) | ||||
9844 | FunctionTemplate->setInvalidDecl(); | ||||
9845 | return FunctionTemplate; | ||||
9846 | } | ||||
9847 | |||||
9848 | if (isMemberSpecialization && !NewFD->isInvalidDecl()) | ||||
9849 | CompleteMemberSpecialization(NewFD, Previous); | ||||
9850 | } | ||||
9851 | |||||
9852 | for (const ParmVarDecl *Param : NewFD->parameters()) { | ||||
9853 | QualType PT = Param->getType(); | ||||
9854 | |||||
9855 | // OpenCL 2.0 pipe restrictions forbids pipe packet types to be non-value | ||||
9856 | // types. | ||||
9857 | if (getLangOpts().OpenCLVersion >= 200 || getLangOpts().OpenCLCPlusPlus) { | ||||
9858 | if(const PipeType *PipeTy = PT->getAs<PipeType>()) { | ||||
9859 | QualType ElemTy = PipeTy->getElementType(); | ||||
9860 | if (ElemTy->isReferenceType() || ElemTy->isPointerType()) { | ||||
9861 | Diag(Param->getTypeSpecStartLoc(), diag::err_reference_pipe_type ); | ||||
9862 | D.setInvalidType(); | ||||
9863 | } | ||||
9864 | } | ||||
9865 | } | ||||
9866 | } | ||||
9867 | |||||
9868 | // Here we have an function template explicit specialization at class scope. | ||||
9869 | // The actual specialization will be postponed to template instatiation | ||||
9870 | // time via the ClassScopeFunctionSpecializationDecl node. | ||||
9871 | if (isDependentClassScopeExplicitSpecialization) { | ||||
9872 | ClassScopeFunctionSpecializationDecl *NewSpec = | ||||
9873 | ClassScopeFunctionSpecializationDecl::Create( | ||||
9874 | Context, CurContext, NewFD->getLocation(), | ||||
9875 | cast<CXXMethodDecl>(NewFD), | ||||
9876 | HasExplicitTemplateArgs, TemplateArgs); | ||||
9877 | CurContext->addDecl(NewSpec); | ||||
9878 | AddToScope = false; | ||||
9879 | } | ||||
9880 | |||||
9881 | // Diagnose availability attributes. Availability cannot be used on functions | ||||
9882 | // that are run during load/unload. | ||||
9883 | if (const auto *attr = NewFD->getAttr<AvailabilityAttr>()) { | ||||
9884 | if (NewFD->hasAttr<ConstructorAttr>()) { | ||||
9885 | Diag(attr->getLocation(), diag::warn_availability_on_static_initializer) | ||||
9886 | << 1; | ||||
9887 | NewFD->dropAttr<AvailabilityAttr>(); | ||||
9888 | } | ||||
9889 | if (NewFD->hasAttr<DestructorAttr>()) { | ||||
9890 | Diag(attr->getLocation(), diag::warn_availability_on_static_initializer) | ||||
9891 | << 2; | ||||
9892 | NewFD->dropAttr<AvailabilityAttr>(); | ||||
9893 | } | ||||
9894 | } | ||||
9895 | |||||
9896 | // Diagnose no_builtin attribute on function declaration that are not a | ||||
9897 | // definition. | ||||
9898 | // FIXME: We should really be doing this in | ||||
9899 | // SemaDeclAttr.cpp::handleNoBuiltinAttr, unfortunately we only have access to | ||||
9900 | // the FunctionDecl and at this point of the code | ||||
9901 | // FunctionDecl::isThisDeclarationADefinition() which always returns `false` | ||||
9902 | // because Sema::ActOnStartOfFunctionDef has not been called yet. | ||||
9903 | if (const auto *NBA = NewFD->getAttr<NoBuiltinAttr>()) | ||||
9904 | switch (D.getFunctionDefinitionKind()) { | ||||
9905 | case FunctionDefinitionKind::Defaulted: | ||||
9906 | case FunctionDefinitionKind::Deleted: | ||||
9907 | Diag(NBA->getLocation(), | ||||
9908 | diag::err_attribute_no_builtin_on_defaulted_deleted_function) | ||||
9909 | << NBA->getSpelling(); | ||||
9910 | break; | ||||
9911 | case FunctionDefinitionKind::Declaration: | ||||
9912 | Diag(NBA->getLocation(), diag::err_attribute_no_builtin_on_non_definition) | ||||
9913 | << NBA->getSpelling(); | ||||
9914 | break; | ||||
9915 | case FunctionDefinitionKind::Definition: | ||||
9916 | break; | ||||
9917 | } | ||||
9918 | |||||
9919 | return NewFD; | ||||
9920 | } | ||||
9921 | |||||
9922 | /// Return a CodeSegAttr from a containing class. The Microsoft docs say | ||||
9923 | /// when __declspec(code_seg) "is applied to a class, all member functions of | ||||
9924 | /// the class and nested classes -- this includes compiler-generated special | ||||
9925 | /// member functions -- are put in the specified segment." | ||||
9926 | /// The actual behavior is a little more complicated. The Microsoft compiler | ||||
9927 | /// won't check outer classes if there is an active value from #pragma code_seg. | ||||
9928 | /// The CodeSeg is always applied from the direct parent but only from outer | ||||
9929 | /// classes when the #pragma code_seg stack is empty. See: | ||||
9930 | /// https://reviews.llvm.org/D22931, the Microsoft feedback page is no longer | ||||
9931 | /// available since MS has removed the page. | ||||
9932 | static Attr *getImplicitCodeSegAttrFromClass(Sema &S, const FunctionDecl *FD) { | ||||
9933 | const auto *Method = dyn_cast<CXXMethodDecl>(FD); | ||||
9934 | if (!Method) | ||||
9935 | return nullptr; | ||||
9936 | const CXXRecordDecl *Parent = Method->getParent(); | ||||
9937 | if (const auto *SAttr = Parent->getAttr<CodeSegAttr>()) { | ||||
9938 | Attr *NewAttr = SAttr->clone(S.getASTContext()); | ||||
9939 | NewAttr->setImplicit(true); | ||||
9940 | return NewAttr; | ||||
9941 | } | ||||
9942 | |||||
9943 | // The Microsoft compiler won't check outer classes for the CodeSeg | ||||
9944 | // when the #pragma code_seg stack is active. | ||||
9945 | if (S.CodeSegStack.CurrentValue) | ||||
9946 | return nullptr; | ||||
9947 | |||||
9948 | while ((Parent = dyn_cast<CXXRecordDecl>(Parent->getParent()))) { | ||||
9949 | if (const auto *SAttr = Parent->getAttr<CodeSegAttr>()) { | ||||
9950 | Attr *NewAttr = SAttr->clone(S.getASTContext()); | ||||
9951 | NewAttr->setImplicit(true); | ||||
9952 | return NewAttr; | ||||
9953 | } | ||||
9954 | } | ||||
9955 | return nullptr; | ||||
9956 | } | ||||
9957 | |||||
9958 | /// Returns an implicit CodeSegAttr if a __declspec(code_seg) is found on a | ||||
9959 | /// containing class. Otherwise it will return implicit SectionAttr if the | ||||
9960 | /// function is a definition and there is an active value on CodeSegStack | ||||
9961 | /// (from the current #pragma code-seg value). | ||||
9962 | /// | ||||
9963 | /// \param FD Function being declared. | ||||
9964 | /// \param IsDefinition Whether it is a definition or just a declarartion. | ||||
9965 | /// \returns A CodeSegAttr or SectionAttr to apply to the function or | ||||
9966 | /// nullptr if no attribute should be added. | ||||
9967 | Attr *Sema::getImplicitCodeSegOrSectionAttrForFunction(const FunctionDecl *FD, | ||||
9968 | bool IsDefinition) { | ||||
9969 | if (Attr *A = getImplicitCodeSegAttrFromClass(*this, FD)) | ||||
9970 | return A; | ||||
9971 | if (!FD->hasAttr<SectionAttr>() && IsDefinition && | ||||
9972 | CodeSegStack.CurrentValue) | ||||
9973 | return SectionAttr::CreateImplicit( | ||||
9974 | getASTContext(), CodeSegStack.CurrentValue->getString(), | ||||
9975 | CodeSegStack.CurrentPragmaLocation, AttributeCommonInfo::AS_Pragma, | ||||
9976 | SectionAttr::Declspec_allocate); | ||||
9977 | return nullptr; | ||||
9978 | } | ||||
9979 | |||||
9980 | /// Determines if we can perform a correct type check for \p D as a | ||||
9981 | /// redeclaration of \p PrevDecl. If not, we can generally still perform a | ||||
9982 | /// best-effort check. | ||||
9983 | /// | ||||
9984 | /// \param NewD The new declaration. | ||||
9985 | /// \param OldD The old declaration. | ||||
9986 | /// \param NewT The portion of the type of the new declaration to check. | ||||
9987 | /// \param OldT The portion of the type of the old declaration to check. | ||||
9988 | bool Sema::canFullyTypeCheckRedeclaration(ValueDecl *NewD, ValueDecl *OldD, | ||||
9989 | QualType NewT, QualType OldT) { | ||||
9990 | if (!NewD->getLexicalDeclContext()->isDependentContext()) | ||||
9991 | return true; | ||||
9992 | |||||
9993 | // For dependently-typed local extern declarations and friends, we can't | ||||
9994 | // perform a correct type check in general until instantiation: | ||||
9995 | // | ||||
9996 | // int f(); | ||||
9997 | // template<typename T> void g() { T f(); } | ||||
9998 | // | ||||
9999 | // (valid if g() is only instantiated with T = int). | ||||
10000 | if (NewT->isDependentType() && | ||||
10001 | (NewD->isLocalExternDecl() || NewD->getFriendObjectKind())) | ||||
10002 | return false; | ||||
10003 | |||||
10004 | // Similarly, if the previous declaration was a dependent local extern | ||||
10005 | // declaration, we don't really know its type yet. | ||||
10006 | if (OldT->isDependentType() && OldD->isLocalExternDecl()) | ||||
10007 | return false; | ||||
10008 | |||||
10009 | return true; | ||||
10010 | } | ||||
10011 | |||||
10012 | /// Checks if the new declaration declared in dependent context must be | ||||
10013 | /// put in the same redeclaration chain as the specified declaration. | ||||
10014 | /// | ||||
10015 | /// \param D Declaration that is checked. | ||||
10016 | /// \param PrevDecl Previous declaration found with proper lookup method for the | ||||
10017 | /// same declaration name. | ||||
10018 | /// \returns True if D must be added to the redeclaration chain which PrevDecl | ||||
10019 | /// belongs to. | ||||
10020 | /// | ||||
10021 | bool Sema::shouldLinkDependentDeclWithPrevious(Decl *D, Decl *PrevDecl) { | ||||
10022 | if (!D->getLexicalDeclContext()->isDependentContext()) | ||||
10023 | return true; | ||||
10024 | |||||
10025 | // Don't chain dependent friend function definitions until instantiation, to | ||||
10026 | // permit cases like | ||||
10027 | // | ||||
10028 | // void func(); | ||||
10029 | // template<typename T> class C1 { friend void func() {} }; | ||||
10030 | // template<typename T> class C2 { friend void func() {} }; | ||||
10031 | // | ||||
10032 | // ... which is valid if only one of C1 and C2 is ever instantiated. | ||||
10033 | // | ||||
10034 | // FIXME: This need only apply to function definitions. For now, we proxy | ||||
10035 | // this by checking for a file-scope function. We do not want this to apply | ||||
10036 | // to friend declarations nominating member functions, because that gets in | ||||
10037 | // the way of access checks. | ||||
10038 | if (D->getFriendObjectKind() && D->getDeclContext()->isFileContext()) | ||||
10039 | return false; | ||||
10040 | |||||
10041 | auto *VD = dyn_cast<ValueDecl>(D); | ||||
10042 | auto *PrevVD = dyn_cast<ValueDecl>(PrevDecl); | ||||
10043 | return !VD || !PrevVD || | ||||
10044 | canFullyTypeCheckRedeclaration(VD, PrevVD, VD->getType(), | ||||
10045 | PrevVD->getType()); | ||||
10046 | } | ||||
10047 | |||||
10048 | /// Check the target attribute of the function for MultiVersion | ||||
10049 | /// validity. | ||||
10050 | /// | ||||
10051 | /// Returns true if there was an error, false otherwise. | ||||
10052 | static bool CheckMultiVersionValue(Sema &S, const FunctionDecl *FD) { | ||||
10053 | const auto *TA = FD->getAttr<TargetAttr>(); | ||||
10054 | assert(TA && "MultiVersion Candidate requires a target attribute")((TA && "MultiVersion Candidate requires a target attribute" ) ? static_cast<void> (0) : __assert_fail ("TA && \"MultiVersion Candidate requires a target attribute\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10054, __PRETTY_FUNCTION__)); | ||||
10055 | ParsedTargetAttr ParseInfo = TA->parse(); | ||||
10056 | const TargetInfo &TargetInfo = S.Context.getTargetInfo(); | ||||
10057 | enum ErrType { Feature = 0, Architecture = 1 }; | ||||
10058 | |||||
10059 | if (!ParseInfo.Architecture.empty() && | ||||
10060 | !TargetInfo.validateCpuIs(ParseInfo.Architecture)) { | ||||
10061 | S.Diag(FD->getLocation(), diag::err_bad_multiversion_option) | ||||
10062 | << Architecture << ParseInfo.Architecture; | ||||
10063 | return true; | ||||
10064 | } | ||||
10065 | |||||
10066 | for (const auto &Feat : ParseInfo.Features) { | ||||
10067 | auto BareFeat = StringRef{Feat}.substr(1); | ||||
10068 | if (Feat[0] == '-') { | ||||
10069 | S.Diag(FD->getLocation(), diag::err_bad_multiversion_option) | ||||
10070 | << Feature << ("no-" + BareFeat).str(); | ||||
10071 | return true; | ||||
10072 | } | ||||
10073 | |||||
10074 | if (!TargetInfo.validateCpuSupports(BareFeat) || | ||||
10075 | !TargetInfo.isValidFeatureName(BareFeat)) { | ||||
10076 | S.Diag(FD->getLocation(), diag::err_bad_multiversion_option) | ||||
10077 | << Feature << BareFeat; | ||||
10078 | return true; | ||||
10079 | } | ||||
10080 | } | ||||
10081 | return false; | ||||
10082 | } | ||||
10083 | |||||
10084 | // Provide a white-list of attributes that are allowed to be combined with | ||||
10085 | // multiversion functions. | ||||
10086 | static bool AttrCompatibleWithMultiVersion(attr::Kind Kind, | ||||
10087 | MultiVersionKind MVType) { | ||||
10088 | // Note: this list/diagnosis must match the list in | ||||
10089 | // checkMultiversionAttributesAllSame. | ||||
10090 | switch (Kind) { | ||||
10091 | default: | ||||
10092 | return false; | ||||
10093 | case attr::Used: | ||||
10094 | return MVType == MultiVersionKind::Target; | ||||
10095 | case attr::NonNull: | ||||
10096 | case attr::NoThrow: | ||||
10097 | return true; | ||||
10098 | } | ||||
10099 | } | ||||
10100 | |||||
10101 | static bool checkNonMultiVersionCompatAttributes(Sema &S, | ||||
10102 | const FunctionDecl *FD, | ||||
10103 | const FunctionDecl *CausedFD, | ||||
10104 | MultiVersionKind MVType) { | ||||
10105 | bool IsCPUSpecificCPUDispatchMVType = | ||||
10106 | MVType == MultiVersionKind::CPUDispatch || | ||||
10107 | MVType == MultiVersionKind::CPUSpecific; | ||||
10108 | const auto Diagnose = [FD, CausedFD, IsCPUSpecificCPUDispatchMVType]( | ||||
10109 | Sema &S, const Attr *A) { | ||||
10110 | S.Diag(FD->getLocation(), diag::err_multiversion_disallowed_other_attr) | ||||
10111 | << IsCPUSpecificCPUDispatchMVType << A; | ||||
10112 | if (CausedFD) | ||||
10113 | S.Diag(CausedFD->getLocation(), diag::note_multiversioning_caused_here); | ||||
10114 | return true; | ||||
10115 | }; | ||||
10116 | |||||
10117 | for (const Attr *A : FD->attrs()) { | ||||
10118 | switch (A->getKind()) { | ||||
10119 | case attr::CPUDispatch: | ||||
10120 | case attr::CPUSpecific: | ||||
10121 | if (MVType != MultiVersionKind::CPUDispatch && | ||||
10122 | MVType != MultiVersionKind::CPUSpecific) | ||||
10123 | return Diagnose(S, A); | ||||
10124 | break; | ||||
10125 | case attr::Target: | ||||
10126 | if (MVType != MultiVersionKind::Target) | ||||
10127 | return Diagnose(S, A); | ||||
10128 | break; | ||||
10129 | default: | ||||
10130 | if (!AttrCompatibleWithMultiVersion(A->getKind(), MVType)) | ||||
10131 | return Diagnose(S, A); | ||||
10132 | break; | ||||
10133 | } | ||||
10134 | } | ||||
10135 | return false; | ||||
10136 | } | ||||
10137 | |||||
10138 | bool Sema::areMultiversionVariantFunctionsCompatible( | ||||
10139 | const FunctionDecl *OldFD, const FunctionDecl *NewFD, | ||||
10140 | const PartialDiagnostic &NoProtoDiagID, | ||||
10141 | const PartialDiagnosticAt &NoteCausedDiagIDAt, | ||||
10142 | const PartialDiagnosticAt &NoSupportDiagIDAt, | ||||
10143 | const PartialDiagnosticAt &DiffDiagIDAt, bool TemplatesSupported, | ||||
10144 | bool ConstexprSupported, bool CLinkageMayDiffer) { | ||||
10145 | enum DoesntSupport { | ||||
10146 | FuncTemplates = 0, | ||||
10147 | VirtFuncs = 1, | ||||
10148 | DeducedReturn = 2, | ||||
10149 | Constructors = 3, | ||||
10150 | Destructors = 4, | ||||
10151 | DeletedFuncs = 5, | ||||
10152 | DefaultedFuncs = 6, | ||||
10153 | ConstexprFuncs = 7, | ||||
10154 | ConstevalFuncs = 8, | ||||
10155 | }; | ||||
10156 | enum Different { | ||||
10157 | CallingConv = 0, | ||||
10158 | ReturnType = 1, | ||||
10159 | ConstexprSpec = 2, | ||||
10160 | InlineSpec = 3, | ||||
10161 | StorageClass = 4, | ||||
10162 | Linkage = 5, | ||||
10163 | }; | ||||
10164 | |||||
10165 | if (NoProtoDiagID.getDiagID() != 0 && OldFD && | ||||
10166 | !OldFD->getType()->getAs<FunctionProtoType>()) { | ||||
10167 | Diag(OldFD->getLocation(), NoProtoDiagID); | ||||
10168 | Diag(NoteCausedDiagIDAt.first, NoteCausedDiagIDAt.second); | ||||
10169 | return true; | ||||
10170 | } | ||||
10171 | |||||
10172 | if (NoProtoDiagID.getDiagID() != 0 && | ||||
10173 | !NewFD->getType()->getAs<FunctionProtoType>()) | ||||
10174 | return Diag(NewFD->getLocation(), NoProtoDiagID); | ||||
10175 | |||||
10176 | if (!TemplatesSupported && | ||||
10177 | NewFD->getTemplatedKind() == FunctionDecl::TK_FunctionTemplate) | ||||
10178 | return Diag(NoSupportDiagIDAt.first, NoSupportDiagIDAt.second) | ||||
10179 | << FuncTemplates; | ||||
10180 | |||||
10181 | if (const auto *NewCXXFD = dyn_cast<CXXMethodDecl>(NewFD)) { | ||||
10182 | if (NewCXXFD->isVirtual()) | ||||
10183 | return Diag(NoSupportDiagIDAt.first, NoSupportDiagIDAt.second) | ||||
10184 | << VirtFuncs; | ||||
10185 | |||||
10186 | if (isa<CXXConstructorDecl>(NewCXXFD)) | ||||
10187 | return Diag(NoSupportDiagIDAt.first, NoSupportDiagIDAt.second) | ||||
10188 | << Constructors; | ||||
10189 | |||||
10190 | if (isa<CXXDestructorDecl>(NewCXXFD)) | ||||
10191 | return Diag(NoSupportDiagIDAt.first, NoSupportDiagIDAt.second) | ||||
10192 | << Destructors; | ||||
10193 | } | ||||
10194 | |||||
10195 | if (NewFD->isDeleted()) | ||||
10196 | return Diag(NoSupportDiagIDAt.first, NoSupportDiagIDAt.second) | ||||
10197 | << DeletedFuncs; | ||||
10198 | |||||
10199 | if (NewFD->isDefaulted()) | ||||
10200 | return Diag(NoSupportDiagIDAt.first, NoSupportDiagIDAt.second) | ||||
10201 | << DefaultedFuncs; | ||||
10202 | |||||
10203 | if (!ConstexprSupported && NewFD->isConstexpr()) | ||||
10204 | return Diag(NoSupportDiagIDAt.first, NoSupportDiagIDAt.second) | ||||
10205 | << (NewFD->isConsteval() ? ConstevalFuncs : ConstexprFuncs); | ||||
10206 | |||||
10207 | QualType NewQType = Context.getCanonicalType(NewFD->getType()); | ||||
10208 | const auto *NewType = cast<FunctionType>(NewQType); | ||||
10209 | QualType NewReturnType = NewType->getReturnType(); | ||||
10210 | |||||
10211 | if (NewReturnType->isUndeducedType()) | ||||
10212 | return Diag(NoSupportDiagIDAt.first, NoSupportDiagIDAt.second) | ||||
10213 | << DeducedReturn; | ||||
10214 | |||||
10215 | // Ensure the return type is identical. | ||||
10216 | if (OldFD) { | ||||
10217 | QualType OldQType = Context.getCanonicalType(OldFD->getType()); | ||||
10218 | const auto *OldType = cast<FunctionType>(OldQType); | ||||
10219 | FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); | ||||
10220 | FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); | ||||
10221 | |||||
10222 | if (OldTypeInfo.getCC() != NewTypeInfo.getCC()) | ||||
10223 | return Diag(DiffDiagIDAt.first, DiffDiagIDAt.second) << CallingConv; | ||||
10224 | |||||
10225 | QualType OldReturnType = OldType->getReturnType(); | ||||
10226 | |||||
10227 | if (OldReturnType != NewReturnType) | ||||
10228 | return Diag(DiffDiagIDAt.first, DiffDiagIDAt.second) << ReturnType; | ||||
10229 | |||||
10230 | if (OldFD->getConstexprKind() != NewFD->getConstexprKind()) | ||||
10231 | return Diag(DiffDiagIDAt.first, DiffDiagIDAt.second) << ConstexprSpec; | ||||
10232 | |||||
10233 | if (OldFD->isInlineSpecified() != NewFD->isInlineSpecified()) | ||||
10234 | return Diag(DiffDiagIDAt.first, DiffDiagIDAt.second) << InlineSpec; | ||||
10235 | |||||
10236 | if (OldFD->getStorageClass() != NewFD->getStorageClass()) | ||||
10237 | return Diag(DiffDiagIDAt.first, DiffDiagIDAt.second) << StorageClass; | ||||
10238 | |||||
10239 | if (!CLinkageMayDiffer && OldFD->isExternC() != NewFD->isExternC()) | ||||
10240 | return Diag(DiffDiagIDAt.first, DiffDiagIDAt.second) << Linkage; | ||||
10241 | |||||
10242 | if (CheckEquivalentExceptionSpec( | ||||
10243 | OldFD->getType()->getAs<FunctionProtoType>(), OldFD->getLocation(), | ||||
10244 | NewFD->getType()->getAs<FunctionProtoType>(), NewFD->getLocation())) | ||||
10245 | return true; | ||||
10246 | } | ||||
10247 | return false; | ||||
10248 | } | ||||
10249 | |||||
10250 | static bool CheckMultiVersionAdditionalRules(Sema &S, const FunctionDecl *OldFD, | ||||
10251 | const FunctionDecl *NewFD, | ||||
10252 | bool CausesMV, | ||||
10253 | MultiVersionKind MVType) { | ||||
10254 | if (!S.getASTContext().getTargetInfo().supportsMultiVersioning()) { | ||||
10255 | S.Diag(NewFD->getLocation(), diag::err_multiversion_not_supported); | ||||
10256 | if (OldFD) | ||||
10257 | S.Diag(OldFD->getLocation(), diag::note_previous_declaration); | ||||
10258 | return true; | ||||
10259 | } | ||||
10260 | |||||
10261 | bool IsCPUSpecificCPUDispatchMVType = | ||||
10262 | MVType == MultiVersionKind::CPUDispatch || | ||||
10263 | MVType == MultiVersionKind::CPUSpecific; | ||||
10264 | |||||
10265 | if (CausesMV && OldFD && | ||||
10266 | checkNonMultiVersionCompatAttributes(S, OldFD, NewFD, MVType)) | ||||
10267 | return true; | ||||
10268 | |||||
10269 | if (checkNonMultiVersionCompatAttributes(S, NewFD, nullptr, MVType)) | ||||
10270 | return true; | ||||
10271 | |||||
10272 | // Only allow transition to MultiVersion if it hasn't been used. | ||||
10273 | if (OldFD && CausesMV && OldFD->isUsed(false)) | ||||
10274 | return S.Diag(NewFD->getLocation(), diag::err_multiversion_after_used); | ||||
10275 | |||||
10276 | return S.areMultiversionVariantFunctionsCompatible( | ||||
10277 | OldFD, NewFD, S.PDiag(diag::err_multiversion_noproto), | ||||
10278 | PartialDiagnosticAt(NewFD->getLocation(), | ||||
10279 | S.PDiag(diag::note_multiversioning_caused_here)), | ||||
10280 | PartialDiagnosticAt(NewFD->getLocation(), | ||||
10281 | S.PDiag(diag::err_multiversion_doesnt_support) | ||||
10282 | << IsCPUSpecificCPUDispatchMVType), | ||||
10283 | PartialDiagnosticAt(NewFD->getLocation(), | ||||
10284 | S.PDiag(diag::err_multiversion_diff)), | ||||
10285 | /*TemplatesSupported=*/false, | ||||
10286 | /*ConstexprSupported=*/!IsCPUSpecificCPUDispatchMVType, | ||||
10287 | /*CLinkageMayDiffer=*/false); | ||||
10288 | } | ||||
10289 | |||||
10290 | /// Check the validity of a multiversion function declaration that is the | ||||
10291 | /// first of its kind. Also sets the multiversion'ness' of the function itself. | ||||
10292 | /// | ||||
10293 | /// This sets NewFD->isInvalidDecl() to true if there was an error. | ||||
10294 | /// | ||||
10295 | /// Returns true if there was an error, false otherwise. | ||||
10296 | static bool CheckMultiVersionFirstFunction(Sema &S, FunctionDecl *FD, | ||||
10297 | MultiVersionKind MVType, | ||||
10298 | const TargetAttr *TA) { | ||||
10299 | assert(MVType != MultiVersionKind::None &&((MVType != MultiVersionKind::None && "Function lacks multiversion attribute" ) ? static_cast<void> (0) : __assert_fail ("MVType != MultiVersionKind::None && \"Function lacks multiversion attribute\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10300, __PRETTY_FUNCTION__)) | ||||
10300 | "Function lacks multiversion attribute")((MVType != MultiVersionKind::None && "Function lacks multiversion attribute" ) ? static_cast<void> (0) : __assert_fail ("MVType != MultiVersionKind::None && \"Function lacks multiversion attribute\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10300, __PRETTY_FUNCTION__)); | ||||
10301 | |||||
10302 | // Target only causes MV if it is default, otherwise this is a normal | ||||
10303 | // function. | ||||
10304 | if (MVType == MultiVersionKind::Target && !TA->isDefaultVersion()) | ||||
10305 | return false; | ||||
10306 | |||||
10307 | if (MVType == MultiVersionKind::Target && CheckMultiVersionValue(S, FD)) { | ||||
10308 | FD->setInvalidDecl(); | ||||
10309 | return true; | ||||
10310 | } | ||||
10311 | |||||
10312 | if (CheckMultiVersionAdditionalRules(S, nullptr, FD, true, MVType)) { | ||||
10313 | FD->setInvalidDecl(); | ||||
10314 | return true; | ||||
10315 | } | ||||
10316 | |||||
10317 | FD->setIsMultiVersion(); | ||||
10318 | return false; | ||||
10319 | } | ||||
10320 | |||||
10321 | static bool PreviousDeclsHaveMultiVersionAttribute(const FunctionDecl *FD) { | ||||
10322 | for (const Decl *D = FD->getPreviousDecl(); D; D = D->getPreviousDecl()) { | ||||
10323 | if (D->getAsFunction()->getMultiVersionKind() != MultiVersionKind::None) | ||||
10324 | return true; | ||||
10325 | } | ||||
10326 | |||||
10327 | return false; | ||||
10328 | } | ||||
10329 | |||||
10330 | static bool CheckTargetCausesMultiVersioning( | ||||
10331 | Sema &S, FunctionDecl *OldFD, FunctionDecl *NewFD, const TargetAttr *NewTA, | ||||
10332 | bool &Redeclaration, NamedDecl *&OldDecl, bool &MergeTypeWithPrevious, | ||||
10333 | LookupResult &Previous) { | ||||
10334 | const auto *OldTA = OldFD->getAttr<TargetAttr>(); | ||||
10335 | ParsedTargetAttr NewParsed = NewTA->parse(); | ||||
10336 | // Sort order doesn't matter, it just needs to be consistent. | ||||
10337 | llvm::sort(NewParsed.Features); | ||||
10338 | |||||
10339 | // If the old decl is NOT MultiVersioned yet, and we don't cause that | ||||
10340 | // to change, this is a simple redeclaration. | ||||
10341 | if (!NewTA->isDefaultVersion() && | ||||
10342 | (!OldTA || OldTA->getFeaturesStr() == NewTA->getFeaturesStr())) | ||||
10343 | return false; | ||||
10344 | |||||
10345 | // Otherwise, this decl causes MultiVersioning. | ||||
10346 | if (!S.getASTContext().getTargetInfo().supportsMultiVersioning()) { | ||||
10347 | S.Diag(NewFD->getLocation(), diag::err_multiversion_not_supported); | ||||
10348 | S.Diag(OldFD->getLocation(), diag::note_previous_declaration); | ||||
10349 | NewFD->setInvalidDecl(); | ||||
10350 | return true; | ||||
10351 | } | ||||
10352 | |||||
10353 | if (CheckMultiVersionAdditionalRules(S, OldFD, NewFD, true, | ||||
10354 | MultiVersionKind::Target)) { | ||||
10355 | NewFD->setInvalidDecl(); | ||||
10356 | return true; | ||||
10357 | } | ||||
10358 | |||||
10359 | if (CheckMultiVersionValue(S, NewFD)) { | ||||
10360 | NewFD->setInvalidDecl(); | ||||
10361 | return true; | ||||
10362 | } | ||||
10363 | |||||
10364 | // If this is 'default', permit the forward declaration. | ||||
10365 | if (!OldFD->isMultiVersion() && !OldTA && NewTA->isDefaultVersion()) { | ||||
10366 | Redeclaration = true; | ||||
10367 | OldDecl = OldFD; | ||||
10368 | OldFD->setIsMultiVersion(); | ||||
10369 | NewFD->setIsMultiVersion(); | ||||
10370 | return false; | ||||
10371 | } | ||||
10372 | |||||
10373 | if (CheckMultiVersionValue(S, OldFD)) { | ||||
10374 | S.Diag(NewFD->getLocation(), diag::note_multiversioning_caused_here); | ||||
10375 | NewFD->setInvalidDecl(); | ||||
10376 | return true; | ||||
10377 | } | ||||
10378 | |||||
10379 | ParsedTargetAttr OldParsed = OldTA->parse(std::less<std::string>()); | ||||
10380 | |||||
10381 | if (OldParsed == NewParsed) { | ||||
10382 | S.Diag(NewFD->getLocation(), diag::err_multiversion_duplicate); | ||||
10383 | S.Diag(OldFD->getLocation(), diag::note_previous_declaration); | ||||
10384 | NewFD->setInvalidDecl(); | ||||
10385 | return true; | ||||
10386 | } | ||||
10387 | |||||
10388 | for (const auto *FD : OldFD->redecls()) { | ||||
10389 | const auto *CurTA = FD->getAttr<TargetAttr>(); | ||||
10390 | // We allow forward declarations before ANY multiversioning attributes, but | ||||
10391 | // nothing after the fact. | ||||
10392 | if (PreviousDeclsHaveMultiVersionAttribute(FD) && | ||||
10393 | (!CurTA || CurTA->isInherited())) { | ||||
10394 | S.Diag(FD->getLocation(), diag::err_multiversion_required_in_redecl) | ||||
10395 | << 0; | ||||
10396 | S.Diag(NewFD->getLocation(), diag::note_multiversioning_caused_here); | ||||
10397 | NewFD->setInvalidDecl(); | ||||
10398 | return true; | ||||
10399 | } | ||||
10400 | } | ||||
10401 | |||||
10402 | OldFD->setIsMultiVersion(); | ||||
10403 | NewFD->setIsMultiVersion(); | ||||
10404 | Redeclaration = false; | ||||
10405 | MergeTypeWithPrevious = false; | ||||
10406 | OldDecl = nullptr; | ||||
10407 | Previous.clear(); | ||||
10408 | return false; | ||||
10409 | } | ||||
10410 | |||||
10411 | /// Check the validity of a new function declaration being added to an existing | ||||
10412 | /// multiversioned declaration collection. | ||||
10413 | static bool CheckMultiVersionAdditionalDecl( | ||||
10414 | Sema &S, FunctionDecl *OldFD, FunctionDecl *NewFD, | ||||
10415 | MultiVersionKind NewMVType, const TargetAttr *NewTA, | ||||
10416 | const CPUDispatchAttr *NewCPUDisp, const CPUSpecificAttr *NewCPUSpec, | ||||
10417 | bool &Redeclaration, NamedDecl *&OldDecl, bool &MergeTypeWithPrevious, | ||||
10418 | LookupResult &Previous) { | ||||
10419 | |||||
10420 | MultiVersionKind OldMVType = OldFD->getMultiVersionKind(); | ||||
10421 | // Disallow mixing of multiversioning types. | ||||
10422 | if ((OldMVType == MultiVersionKind::Target && | ||||
10423 | NewMVType != MultiVersionKind::Target) || | ||||
10424 | (NewMVType == MultiVersionKind::Target && | ||||
10425 | OldMVType != MultiVersionKind::Target)) { | ||||
10426 | S.Diag(NewFD->getLocation(), diag::err_multiversion_types_mixed); | ||||
10427 | S.Diag(OldFD->getLocation(), diag::note_previous_declaration); | ||||
10428 | NewFD->setInvalidDecl(); | ||||
10429 | return true; | ||||
10430 | } | ||||
10431 | |||||
10432 | ParsedTargetAttr NewParsed; | ||||
10433 | if (NewTA) { | ||||
10434 | NewParsed = NewTA->parse(); | ||||
10435 | llvm::sort(NewParsed.Features); | ||||
10436 | } | ||||
10437 | |||||
10438 | bool UseMemberUsingDeclRules = | ||||
10439 | S.CurContext->isRecord() && !NewFD->getFriendObjectKind(); | ||||
10440 | |||||
10441 | // Next, check ALL non-overloads to see if this is a redeclaration of a | ||||
10442 | // previous member of the MultiVersion set. | ||||
10443 | for (NamedDecl *ND : Previous) { | ||||
10444 | FunctionDecl *CurFD = ND->getAsFunction(); | ||||
10445 | if (!CurFD) | ||||
10446 | continue; | ||||
10447 | if (S.IsOverload(NewFD, CurFD, UseMemberUsingDeclRules)) | ||||
10448 | continue; | ||||
10449 | |||||
10450 | if (NewMVType == MultiVersionKind::Target) { | ||||
10451 | const auto *CurTA = CurFD->getAttr<TargetAttr>(); | ||||
10452 | if (CurTA->getFeaturesStr() == NewTA->getFeaturesStr()) { | ||||
10453 | NewFD->setIsMultiVersion(); | ||||
10454 | Redeclaration = true; | ||||
10455 | OldDecl = ND; | ||||
10456 | return false; | ||||
10457 | } | ||||
10458 | |||||
10459 | ParsedTargetAttr CurParsed = CurTA->parse(std::less<std::string>()); | ||||
10460 | if (CurParsed == NewParsed) { | ||||
10461 | S.Diag(NewFD->getLocation(), diag::err_multiversion_duplicate); | ||||
10462 | S.Diag(CurFD->getLocation(), diag::note_previous_declaration); | ||||
10463 | NewFD->setInvalidDecl(); | ||||
10464 | return true; | ||||
10465 | } | ||||
10466 | } else { | ||||
10467 | const auto *CurCPUSpec = CurFD->getAttr<CPUSpecificAttr>(); | ||||
10468 | const auto *CurCPUDisp = CurFD->getAttr<CPUDispatchAttr>(); | ||||
10469 | // Handle CPUDispatch/CPUSpecific versions. | ||||
10470 | // Only 1 CPUDispatch function is allowed, this will make it go through | ||||
10471 | // the redeclaration errors. | ||||
10472 | if (NewMVType == MultiVersionKind::CPUDispatch && | ||||
10473 | CurFD->hasAttr<CPUDispatchAttr>()) { | ||||
10474 | if (CurCPUDisp->cpus_size() == NewCPUDisp->cpus_size() && | ||||
10475 | std::equal( | ||||
10476 | CurCPUDisp->cpus_begin(), CurCPUDisp->cpus_end(), | ||||
10477 | NewCPUDisp->cpus_begin(), | ||||
10478 | [](const IdentifierInfo *Cur, const IdentifierInfo *New) { | ||||
10479 | return Cur->getName() == New->getName(); | ||||
10480 | })) { | ||||
10481 | NewFD->setIsMultiVersion(); | ||||
10482 | Redeclaration = true; | ||||
10483 | OldDecl = ND; | ||||
10484 | return false; | ||||
10485 | } | ||||
10486 | |||||
10487 | // If the declarations don't match, this is an error condition. | ||||
10488 | S.Diag(NewFD->getLocation(), diag::err_cpu_dispatch_mismatch); | ||||
10489 | S.Diag(CurFD->getLocation(), diag::note_previous_declaration); | ||||
10490 | NewFD->setInvalidDecl(); | ||||
10491 | return true; | ||||
10492 | } | ||||
10493 | if (NewMVType == MultiVersionKind::CPUSpecific && CurCPUSpec) { | ||||
10494 | |||||
10495 | if (CurCPUSpec->cpus_size() == NewCPUSpec->cpus_size() && | ||||
10496 | std::equal( | ||||
10497 | CurCPUSpec->cpus_begin(), CurCPUSpec->cpus_end(), | ||||
10498 | NewCPUSpec->cpus_begin(), | ||||
10499 | [](const IdentifierInfo *Cur, const IdentifierInfo *New) { | ||||
10500 | return Cur->getName() == New->getName(); | ||||
10501 | })) { | ||||
10502 | NewFD->setIsMultiVersion(); | ||||
10503 | Redeclaration = true; | ||||
10504 | OldDecl = ND; | ||||
10505 | return false; | ||||
10506 | } | ||||
10507 | |||||
10508 | // Only 1 version of CPUSpecific is allowed for each CPU. | ||||
10509 | for (const IdentifierInfo *CurII : CurCPUSpec->cpus()) { | ||||
10510 | for (const IdentifierInfo *NewII : NewCPUSpec->cpus()) { | ||||
10511 | if (CurII == NewII) { | ||||
10512 | S.Diag(NewFD->getLocation(), diag::err_cpu_specific_multiple_defs) | ||||
10513 | << NewII; | ||||
10514 | S.Diag(CurFD->getLocation(), diag::note_previous_declaration); | ||||
10515 | NewFD->setInvalidDecl(); | ||||
10516 | return true; | ||||
10517 | } | ||||
10518 | } | ||||
10519 | } | ||||
10520 | } | ||||
10521 | // If the two decls aren't the same MVType, there is no possible error | ||||
10522 | // condition. | ||||
10523 | } | ||||
10524 | } | ||||
10525 | |||||
10526 | // Else, this is simply a non-redecl case. Checking the 'value' is only | ||||
10527 | // necessary in the Target case, since The CPUSpecific/Dispatch cases are | ||||
10528 | // handled in the attribute adding step. | ||||
10529 | if (NewMVType == MultiVersionKind::Target && | ||||
10530 | CheckMultiVersionValue(S, NewFD)) { | ||||
10531 | NewFD->setInvalidDecl(); | ||||
10532 | return true; | ||||
10533 | } | ||||
10534 | |||||
10535 | if (CheckMultiVersionAdditionalRules(S, OldFD, NewFD, | ||||
10536 | !OldFD->isMultiVersion(), NewMVType)) { | ||||
10537 | NewFD->setInvalidDecl(); | ||||
10538 | return true; | ||||
10539 | } | ||||
10540 | |||||
10541 | // Permit forward declarations in the case where these two are compatible. | ||||
10542 | if (!OldFD->isMultiVersion()) { | ||||
10543 | OldFD->setIsMultiVersion(); | ||||
10544 | NewFD->setIsMultiVersion(); | ||||
10545 | Redeclaration = true; | ||||
10546 | OldDecl = OldFD; | ||||
10547 | return false; | ||||
10548 | } | ||||
10549 | |||||
10550 | NewFD->setIsMultiVersion(); | ||||
10551 | Redeclaration = false; | ||||
10552 | MergeTypeWithPrevious = false; | ||||
10553 | OldDecl = nullptr; | ||||
10554 | Previous.clear(); | ||||
10555 | return false; | ||||
10556 | } | ||||
10557 | |||||
10558 | |||||
10559 | /// Check the validity of a mulitversion function declaration. | ||||
10560 | /// Also sets the multiversion'ness' of the function itself. | ||||
10561 | /// | ||||
10562 | /// This sets NewFD->isInvalidDecl() to true if there was an error. | ||||
10563 | /// | ||||
10564 | /// Returns true if there was an error, false otherwise. | ||||
10565 | static bool CheckMultiVersionFunction(Sema &S, FunctionDecl *NewFD, | ||||
10566 | bool &Redeclaration, NamedDecl *&OldDecl, | ||||
10567 | bool &MergeTypeWithPrevious, | ||||
10568 | LookupResult &Previous) { | ||||
10569 | const auto *NewTA = NewFD->getAttr<TargetAttr>(); | ||||
10570 | const auto *NewCPUDisp = NewFD->getAttr<CPUDispatchAttr>(); | ||||
10571 | const auto *NewCPUSpec = NewFD->getAttr<CPUSpecificAttr>(); | ||||
10572 | |||||
10573 | // Mixing Multiversioning types is prohibited. | ||||
10574 | if ((NewTA && NewCPUDisp) || (NewTA && NewCPUSpec) || | ||||
10575 | (NewCPUDisp && NewCPUSpec)) { | ||||
10576 | S.Diag(NewFD->getLocation(), diag::err_multiversion_types_mixed); | ||||
10577 | NewFD->setInvalidDecl(); | ||||
10578 | return true; | ||||
10579 | } | ||||
10580 | |||||
10581 | MultiVersionKind MVType = NewFD->getMultiVersionKind(); | ||||
10582 | |||||
10583 | // Main isn't allowed to become a multiversion function, however it IS | ||||
10584 | // permitted to have 'main' be marked with the 'target' optimization hint. | ||||
10585 | if (NewFD->isMain()) { | ||||
10586 | if ((MVType == MultiVersionKind::Target && NewTA->isDefaultVersion()) || | ||||
10587 | MVType == MultiVersionKind::CPUDispatch || | ||||
10588 | MVType == MultiVersionKind::CPUSpecific) { | ||||
10589 | S.Diag(NewFD->getLocation(), diag::err_multiversion_not_allowed_on_main); | ||||
10590 | NewFD->setInvalidDecl(); | ||||
10591 | return true; | ||||
10592 | } | ||||
10593 | return false; | ||||
10594 | } | ||||
10595 | |||||
10596 | if (!OldDecl || !OldDecl->getAsFunction() || | ||||
10597 | OldDecl->getDeclContext()->getRedeclContext() != | ||||
10598 | NewFD->getDeclContext()->getRedeclContext()) { | ||||
10599 | // If there's no previous declaration, AND this isn't attempting to cause | ||||
10600 | // multiversioning, this isn't an error condition. | ||||
10601 | if (MVType == MultiVersionKind::None) | ||||
10602 | return false; | ||||
10603 | return CheckMultiVersionFirstFunction(S, NewFD, MVType, NewTA); | ||||
10604 | } | ||||
10605 | |||||
10606 | FunctionDecl *OldFD = OldDecl->getAsFunction(); | ||||
10607 | |||||
10608 | if (!OldFD->isMultiVersion() && MVType == MultiVersionKind::None) | ||||
10609 | return false; | ||||
10610 | |||||
10611 | if (OldFD->isMultiVersion() && MVType == MultiVersionKind::None) { | ||||
10612 | S.Diag(NewFD->getLocation(), diag::err_multiversion_required_in_redecl) | ||||
10613 | << (OldFD->getMultiVersionKind() != MultiVersionKind::Target); | ||||
10614 | NewFD->setInvalidDecl(); | ||||
10615 | return true; | ||||
10616 | } | ||||
10617 | |||||
10618 | // Handle the target potentially causes multiversioning case. | ||||
10619 | if (!OldFD->isMultiVersion() && MVType == MultiVersionKind::Target) | ||||
10620 | return CheckTargetCausesMultiVersioning(S, OldFD, NewFD, NewTA, | ||||
10621 | Redeclaration, OldDecl, | ||||
10622 | MergeTypeWithPrevious, Previous); | ||||
10623 | |||||
10624 | // At this point, we have a multiversion function decl (in OldFD) AND an | ||||
10625 | // appropriate attribute in the current function decl. Resolve that these are | ||||
10626 | // still compatible with previous declarations. | ||||
10627 | return CheckMultiVersionAdditionalDecl( | ||||
10628 | S, OldFD, NewFD, MVType, NewTA, NewCPUDisp, NewCPUSpec, Redeclaration, | ||||
10629 | OldDecl, MergeTypeWithPrevious, Previous); | ||||
10630 | } | ||||
10631 | |||||
10632 | /// Perform semantic checking of a new function declaration. | ||||
10633 | /// | ||||
10634 | /// Performs semantic analysis of the new function declaration | ||||
10635 | /// NewFD. This routine performs all semantic checking that does not | ||||
10636 | /// require the actual declarator involved in the declaration, and is | ||||
10637 | /// used both for the declaration of functions as they are parsed | ||||
10638 | /// (called via ActOnDeclarator) and for the declaration of functions | ||||
10639 | /// that have been instantiated via C++ template instantiation (called | ||||
10640 | /// via InstantiateDecl). | ||||
10641 | /// | ||||
10642 | /// \param IsMemberSpecialization whether this new function declaration is | ||||
10643 | /// a member specialization (that replaces any definition provided by the | ||||
10644 | /// previous declaration). | ||||
10645 | /// | ||||
10646 | /// This sets NewFD->isInvalidDecl() to true if there was an error. | ||||
10647 | /// | ||||
10648 | /// \returns true if the function declaration is a redeclaration. | ||||
10649 | bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, | ||||
10650 | LookupResult &Previous, | ||||
10651 | bool IsMemberSpecialization) { | ||||
10652 | assert(!NewFD->getReturnType()->isVariablyModifiedType() &&((!NewFD->getReturnType()->isVariablyModifiedType() && "Variably modified return types are not handled here") ? static_cast <void> (0) : __assert_fail ("!NewFD->getReturnType()->isVariablyModifiedType() && \"Variably modified return types are not handled here\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10653, __PRETTY_FUNCTION__)) | ||||
10653 | "Variably modified return types are not handled here")((!NewFD->getReturnType()->isVariablyModifiedType() && "Variably modified return types are not handled here") ? static_cast <void> (0) : __assert_fail ("!NewFD->getReturnType()->isVariablyModifiedType() && \"Variably modified return types are not handled here\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10653, __PRETTY_FUNCTION__)); | ||||
10654 | |||||
10655 | // Determine whether the type of this function should be merged with | ||||
10656 | // a previous visible declaration. This never happens for functions in C++, | ||||
10657 | // and always happens in C if the previous declaration was visible. | ||||
10658 | bool MergeTypeWithPrevious = !getLangOpts().CPlusPlus && | ||||
10659 | !Previous.isShadowed(); | ||||
10660 | |||||
10661 | bool Redeclaration = false; | ||||
10662 | NamedDecl *OldDecl = nullptr; | ||||
10663 | bool MayNeedOverloadableChecks = false; | ||||
10664 | |||||
10665 | // Merge or overload the declaration with an existing declaration of | ||||
10666 | // the same name, if appropriate. | ||||
10667 | if (!Previous.empty()) { | ||||
10668 | // Determine whether NewFD is an overload of PrevDecl or | ||||
10669 | // a declaration that requires merging. If it's an overload, | ||||
10670 | // there's no more work to do here; we'll just add the new | ||||
10671 | // function to the scope. | ||||
10672 | if (!AllowOverloadingOfFunction(Previous, Context, NewFD)) { | ||||
10673 | NamedDecl *Candidate = Previous.getRepresentativeDecl(); | ||||
10674 | if (shouldLinkPossiblyHiddenDecl(Candidate, NewFD)) { | ||||
10675 | Redeclaration = true; | ||||
10676 | OldDecl = Candidate; | ||||
10677 | } | ||||
10678 | } else { | ||||
10679 | MayNeedOverloadableChecks = true; | ||||
10680 | switch (CheckOverload(S, NewFD, Previous, OldDecl, | ||||
10681 | /*NewIsUsingDecl*/ false)) { | ||||
10682 | case Ovl_Match: | ||||
10683 | Redeclaration = true; | ||||
10684 | break; | ||||
10685 | |||||
10686 | case Ovl_NonFunction: | ||||
10687 | Redeclaration = true; | ||||
10688 | break; | ||||
10689 | |||||
10690 | case Ovl_Overload: | ||||
10691 | Redeclaration = false; | ||||
10692 | break; | ||||
10693 | } | ||||
10694 | } | ||||
10695 | } | ||||
10696 | |||||
10697 | // Check for a previous extern "C" declaration with this name. | ||||
10698 | if (!Redeclaration && | ||||
10699 | checkForConflictWithNonVisibleExternC(*this, NewFD, Previous)) { | ||||
10700 | if (!Previous.empty()) { | ||||
10701 | // This is an extern "C" declaration with the same name as a previous | ||||
10702 | // declaration, and thus redeclares that entity... | ||||
10703 | Redeclaration = true; | ||||
10704 | OldDecl = Previous.getFoundDecl(); | ||||
10705 | MergeTypeWithPrevious = false; | ||||
10706 | |||||
10707 | // ... except in the presence of __attribute__((overloadable)). | ||||
10708 | if (OldDecl->hasAttr<OverloadableAttr>() || | ||||
10709 | NewFD->hasAttr<OverloadableAttr>()) { | ||||
10710 | if (IsOverload(NewFD, cast<FunctionDecl>(OldDecl), false)) { | ||||
10711 | MayNeedOverloadableChecks = true; | ||||
10712 | Redeclaration = false; | ||||
10713 | OldDecl = nullptr; | ||||
10714 | } | ||||
10715 | } | ||||
10716 | } | ||||
10717 | } | ||||
10718 | |||||
10719 | if (CheckMultiVersionFunction(*this, NewFD, Redeclaration, OldDecl, | ||||
10720 | MergeTypeWithPrevious, Previous)) | ||||
10721 | return Redeclaration; | ||||
10722 | |||||
10723 | // PPC MMA non-pointer types are not allowed as function return types. | ||||
10724 | if (Context.getTargetInfo().getTriple().isPPC64() && | ||||
10725 | CheckPPCMMAType(NewFD->getReturnType(), NewFD->getLocation())) { | ||||
10726 | NewFD->setInvalidDecl(); | ||||
10727 | } | ||||
10728 | |||||
10729 | // C++11 [dcl.constexpr]p8: | ||||
10730 | // A constexpr specifier for a non-static member function that is not | ||||
10731 | // a constructor declares that member function to be const. | ||||
10732 | // | ||||
10733 | // This needs to be delayed until we know whether this is an out-of-line | ||||
10734 | // definition of a static member function. | ||||
10735 | // | ||||
10736 | // This rule is not present in C++1y, so we produce a backwards | ||||
10737 | // compatibility warning whenever it happens in C++11. | ||||
10738 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); | ||||
10739 | if (!getLangOpts().CPlusPlus14 && MD && MD->isConstexpr() && | ||||
10740 | !MD->isStatic() && !isa<CXXConstructorDecl>(MD) && | ||||
10741 | !isa<CXXDestructorDecl>(MD) && !MD->getMethodQualifiers().hasConst()) { | ||||
10742 | CXXMethodDecl *OldMD = nullptr; | ||||
10743 | if (OldDecl) | ||||
10744 | OldMD = dyn_cast_or_null<CXXMethodDecl>(OldDecl->getAsFunction()); | ||||
10745 | if (!OldMD || !OldMD->isStatic()) { | ||||
10746 | const FunctionProtoType *FPT = | ||||
10747 | MD->getType()->castAs<FunctionProtoType>(); | ||||
10748 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); | ||||
10749 | EPI.TypeQuals.addConst(); | ||||
10750 | MD->setType(Context.getFunctionType(FPT->getReturnType(), | ||||
10751 | FPT->getParamTypes(), EPI)); | ||||
10752 | |||||
10753 | // Warn that we did this, if we're not performing template instantiation. | ||||
10754 | // In that case, we'll have warned already when the template was defined. | ||||
10755 | if (!inTemplateInstantiation()) { | ||||
10756 | SourceLocation AddConstLoc; | ||||
10757 | if (FunctionTypeLoc FTL = MD->getTypeSourceInfo()->getTypeLoc() | ||||
10758 | .IgnoreParens().getAs<FunctionTypeLoc>()) | ||||
10759 | AddConstLoc = getLocForEndOfToken(FTL.getRParenLoc()); | ||||
10760 | |||||
10761 | Diag(MD->getLocation(), diag::warn_cxx14_compat_constexpr_not_const) | ||||
10762 | << FixItHint::CreateInsertion(AddConstLoc, " const"); | ||||
10763 | } | ||||
10764 | } | ||||
10765 | } | ||||
10766 | |||||
10767 | if (Redeclaration) { | ||||
10768 | // NewFD and OldDecl represent declarations that need to be | ||||
10769 | // merged. | ||||
10770 | if (MergeFunctionDecl(NewFD, OldDecl, S, MergeTypeWithPrevious)) { | ||||
10771 | NewFD->setInvalidDecl(); | ||||
10772 | return Redeclaration; | ||||
10773 | } | ||||
10774 | |||||
10775 | Previous.clear(); | ||||
10776 | Previous.addDecl(OldDecl); | ||||
10777 | |||||
10778 | if (FunctionTemplateDecl *OldTemplateDecl = | ||||
10779 | dyn_cast<FunctionTemplateDecl>(OldDecl)) { | ||||
10780 | auto *OldFD = OldTemplateDecl->getTemplatedDecl(); | ||||
10781 | FunctionTemplateDecl *NewTemplateDecl | ||||
10782 | = NewFD->getDescribedFunctionTemplate(); | ||||
10783 | assert(NewTemplateDecl && "Template/non-template mismatch")((NewTemplateDecl && "Template/non-template mismatch" ) ? static_cast<void> (0) : __assert_fail ("NewTemplateDecl && \"Template/non-template mismatch\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10783, __PRETTY_FUNCTION__)); | ||||
10784 | |||||
10785 | // The call to MergeFunctionDecl above may have created some state in | ||||
10786 | // NewTemplateDecl that needs to be merged with OldTemplateDecl before we | ||||
10787 | // can add it as a redeclaration. | ||||
10788 | NewTemplateDecl->mergePrevDecl(OldTemplateDecl); | ||||
10789 | |||||
10790 | NewFD->setPreviousDeclaration(OldFD); | ||||
10791 | adjustDeclContextForDeclaratorDecl(NewFD, OldFD); | ||||
10792 | if (NewFD->isCXXClassMember()) { | ||||
10793 | NewFD->setAccess(OldTemplateDecl->getAccess()); | ||||
10794 | NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); | ||||
10795 | } | ||||
10796 | |||||
10797 | // If this is an explicit specialization of a member that is a function | ||||
10798 | // template, mark it as a member specialization. | ||||
10799 | if (IsMemberSpecialization && | ||||
10800 | NewTemplateDecl->getInstantiatedFromMemberTemplate()) { | ||||
10801 | NewTemplateDecl->setMemberSpecialization(); | ||||
10802 | assert(OldTemplateDecl->isMemberSpecialization())((OldTemplateDecl->isMemberSpecialization()) ? static_cast <void> (0) : __assert_fail ("OldTemplateDecl->isMemberSpecialization()" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10802, __PRETTY_FUNCTION__)); | ||||
10803 | // Explicit specializations of a member template do not inherit deleted | ||||
10804 | // status from the parent member template that they are specializing. | ||||
10805 | if (OldFD->isDeleted()) { | ||||
10806 | // FIXME: This assert will not hold in the presence of modules. | ||||
10807 | assert(OldFD->getCanonicalDecl() == OldFD)((OldFD->getCanonicalDecl() == OldFD) ? static_cast<void > (0) : __assert_fail ("OldFD->getCanonicalDecl() == OldFD" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10807, __PRETTY_FUNCTION__)); | ||||
10808 | // FIXME: We need an update record for this AST mutation. | ||||
10809 | OldFD->setDeletedAsWritten(false); | ||||
10810 | } | ||||
10811 | } | ||||
10812 | |||||
10813 | } else { | ||||
10814 | if (shouldLinkDependentDeclWithPrevious(NewFD, OldDecl)) { | ||||
10815 | auto *OldFD = cast<FunctionDecl>(OldDecl); | ||||
10816 | // This needs to happen first so that 'inline' propagates. | ||||
10817 | NewFD->setPreviousDeclaration(OldFD); | ||||
10818 | adjustDeclContextForDeclaratorDecl(NewFD, OldFD); | ||||
10819 | if (NewFD->isCXXClassMember()) | ||||
10820 | NewFD->setAccess(OldFD->getAccess()); | ||||
10821 | } | ||||
10822 | } | ||||
10823 | } else if (!getLangOpts().CPlusPlus && MayNeedOverloadableChecks && | ||||
10824 | !NewFD->getAttr<OverloadableAttr>()) { | ||||
10825 | assert((Previous.empty() ||(((Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && "Non-redecls shouldn't happen without overloadable present") ? static_cast<void> (0) : __assert_fail ("(Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && \"Non-redecls shouldn't happen without overloadable present\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10830, __PRETTY_FUNCTION__)) | ||||
10826 | llvm::any_of(Previous,(((Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && "Non-redecls shouldn't happen without overloadable present") ? static_cast<void> (0) : __assert_fail ("(Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && \"Non-redecls shouldn't happen without overloadable present\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10830, __PRETTY_FUNCTION__)) | ||||
10827 | [](const NamedDecl *ND) {(((Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && "Non-redecls shouldn't happen without overloadable present") ? static_cast<void> (0) : __assert_fail ("(Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && \"Non-redecls shouldn't happen without overloadable present\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10830, __PRETTY_FUNCTION__)) | ||||
10828 | return ND->hasAttr<OverloadableAttr>();(((Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && "Non-redecls shouldn't happen without overloadable present") ? static_cast<void> (0) : __assert_fail ("(Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && \"Non-redecls shouldn't happen without overloadable present\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10830, __PRETTY_FUNCTION__)) | ||||
10829 | })) &&(((Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && "Non-redecls shouldn't happen without overloadable present") ? static_cast<void> (0) : __assert_fail ("(Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && \"Non-redecls shouldn't happen without overloadable present\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10830, __PRETTY_FUNCTION__)) | ||||
10830 | "Non-redecls shouldn't happen without overloadable present")(((Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && "Non-redecls shouldn't happen without overloadable present") ? static_cast<void> (0) : __assert_fail ("(Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && \"Non-redecls shouldn't happen without overloadable present\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 10830, __PRETTY_FUNCTION__)); | ||||
10831 | |||||
10832 | auto OtherUnmarkedIter = llvm::find_if(Previous, [](const NamedDecl *ND) { | ||||
10833 | const auto *FD = dyn_cast<FunctionDecl>(ND); | ||||
10834 | return FD && !FD->hasAttr<OverloadableAttr>(); | ||||
10835 | }); | ||||
10836 | |||||
10837 | if (OtherUnmarkedIter != Previous.end()) { | ||||
10838 | Diag(NewFD->getLocation(), | ||||
10839 | diag::err_attribute_overloadable_multiple_unmarked_overloads); | ||||
10840 | Diag((*OtherUnmarkedIter)->getLocation(), | ||||
10841 | diag::note_attribute_overloadable_prev_overload) | ||||
10842 | << false; | ||||
10843 | |||||
10844 | NewFD->addAttr(OverloadableAttr::CreateImplicit(Context)); | ||||
10845 | } | ||||
10846 | } | ||||
10847 | |||||
10848 | if (LangOpts.OpenMP) | ||||
10849 | ActOnFinishedFunctionDefinitionInOpenMPAssumeScope(NewFD); | ||||
10850 | |||||
10851 | // Semantic checking for this function declaration (in isolation). | ||||
10852 | |||||
10853 | if (getLangOpts().CPlusPlus) { | ||||
10854 | // C++-specific checks. | ||||
10855 | if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { | ||||
10856 | CheckConstructor(Constructor); | ||||
10857 | } else if (CXXDestructorDecl *Destructor = | ||||
10858 | dyn_cast<CXXDestructorDecl>(NewFD)) { | ||||
10859 | CXXRecordDecl *Record = Destructor->getParent(); | ||||
10860 | QualType ClassType = Context.getTypeDeclType(Record); | ||||
10861 | |||||
10862 | // FIXME: Shouldn't we be able to perform this check even when the class | ||||
10863 | // type is dependent? Both gcc and edg can handle that. | ||||
10864 | if (!ClassType->isDependentType()) { | ||||
10865 | DeclarationName Name | ||||
10866 | = Context.DeclarationNames.getCXXDestructorName( | ||||
10867 | Context.getCanonicalType(ClassType)); | ||||
10868 | if (NewFD->getDeclName() != Name) { | ||||
10869 | Diag(NewFD->getLocation(), diag::err_destructor_name); | ||||
10870 | NewFD->setInvalidDecl(); | ||||
10871 | return Redeclaration; | ||||
10872 | } | ||||
10873 | } | ||||
10874 | } else if (auto *Guide = dyn_cast<CXXDeductionGuideDecl>(NewFD)) { | ||||
10875 | if (auto *TD = Guide->getDescribedFunctionTemplate()) | ||||
10876 | CheckDeductionGuideTemplate(TD); | ||||
10877 | |||||
10878 | // A deduction guide is not on the list of entities that can be | ||||
10879 | // explicitly specialized. | ||||
10880 | if (Guide->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) | ||||
10881 | Diag(Guide->getBeginLoc(), diag::err_deduction_guide_specialized) | ||||
10882 | << /*explicit specialization*/ 1; | ||||
10883 | } | ||||
10884 | |||||
10885 | // Find any virtual functions that this function overrides. | ||||
10886 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { | ||||
10887 | if (!Method->isFunctionTemplateSpecialization() && | ||||
10888 | !Method->getDescribedFunctionTemplate() && | ||||
10889 | Method->isCanonicalDecl()) { | ||||
10890 | AddOverriddenMethods(Method->getParent(), Method); | ||||
10891 | } | ||||
10892 | if (Method->isVirtual() && NewFD->getTrailingRequiresClause()) | ||||
10893 | // C++2a [class.virtual]p6 | ||||
10894 | // A virtual method shall not have a requires-clause. | ||||
10895 | Diag(NewFD->getTrailingRequiresClause()->getBeginLoc(), | ||||
10896 | diag::err_constrained_virtual_method); | ||||
10897 | |||||
10898 | if (Method->isStatic()) | ||||
10899 | checkThisInStaticMemberFunctionType(Method); | ||||
10900 | } | ||||
10901 | |||||
10902 | if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(NewFD)) | ||||
10903 | ActOnConversionDeclarator(Conversion); | ||||
10904 | |||||
10905 | // Extra checking for C++ overloaded operators (C++ [over.oper]). | ||||
10906 | if (NewFD->isOverloadedOperator() && | ||||
10907 | CheckOverloadedOperatorDeclaration(NewFD)) { | ||||
10908 | NewFD->setInvalidDecl(); | ||||
10909 | return Redeclaration; | ||||
10910 | } | ||||
10911 | |||||
10912 | // Extra checking for C++0x literal operators (C++0x [over.literal]). | ||||
10913 | if (NewFD->getLiteralIdentifier() && | ||||
10914 | CheckLiteralOperatorDeclaration(NewFD)) { | ||||
10915 | NewFD->setInvalidDecl(); | ||||
10916 | return Redeclaration; | ||||
10917 | } | ||||
10918 | |||||
10919 | // In C++, check default arguments now that we have merged decls. Unless | ||||
10920 | // the lexical context is the class, because in this case this is done | ||||
10921 | // during delayed parsing anyway. | ||||
10922 | if (!CurContext->isRecord()) | ||||
10923 | CheckCXXDefaultArguments(NewFD); | ||||
10924 | |||||
10925 | // If this function declares a builtin function, check the type of this | ||||
10926 | // declaration against the expected type for the builtin. | ||||
10927 | if (unsigned BuiltinID = NewFD->getBuiltinID()) { | ||||
10928 | ASTContext::GetBuiltinTypeError Error; | ||||
10929 | LookupNecessaryTypesForBuiltin(S, BuiltinID); | ||||
10930 | QualType T = Context.GetBuiltinType(BuiltinID, Error); | ||||
10931 | // If the type of the builtin differs only in its exception | ||||
10932 | // specification, that's OK. | ||||
10933 | // FIXME: If the types do differ in this way, it would be better to | ||||
10934 | // retain the 'noexcept' form of the type. | ||||
10935 | if (!T.isNull() && | ||||
10936 | !Context.hasSameFunctionTypeIgnoringExceptionSpec(T, | ||||
10937 | NewFD->getType())) | ||||
10938 | // The type of this function differs from the type of the builtin, | ||||
10939 | // so forget about the builtin entirely. | ||||
10940 | Context.BuiltinInfo.forgetBuiltin(BuiltinID, Context.Idents); | ||||
10941 | } | ||||
10942 | |||||
10943 | // If this function is declared as being extern "C", then check to see if | ||||
10944 | // the function returns a UDT (class, struct, or union type) that is not C | ||||
10945 | // compatible, and if it does, warn the user. | ||||
10946 | // But, issue any diagnostic on the first declaration only. | ||||
10947 | if (Previous.empty() && NewFD->isExternC()) { | ||||
10948 | QualType R = NewFD->getReturnType(); | ||||
10949 | if (R->isIncompleteType() && !R->isVoidType()) | ||||
10950 | Diag(NewFD->getLocation(), diag::warn_return_value_udt_incomplete) | ||||
10951 | << NewFD << R; | ||||
10952 | else if (!R.isPODType(Context) && !R->isVoidType() && | ||||
10953 | !R->isObjCObjectPointerType()) | ||||
10954 | Diag(NewFD->getLocation(), diag::warn_return_value_udt) << NewFD << R; | ||||
10955 | } | ||||
10956 | |||||
10957 | // C++1z [dcl.fct]p6: | ||||
10958 | // [...] whether the function has a non-throwing exception-specification | ||||
10959 | // [is] part of the function type | ||||
10960 | // | ||||
10961 | // This results in an ABI break between C++14 and C++17 for functions whose | ||||
10962 | // declared type includes an exception-specification in a parameter or | ||||
10963 | // return type. (Exception specifications on the function itself are OK in | ||||
10964 | // most cases, and exception specifications are not permitted in most other | ||||
10965 | // contexts where they could make it into a mangling.) | ||||
10966 | if (!getLangOpts().CPlusPlus17 && !NewFD->getPrimaryTemplate()) { | ||||
10967 | auto HasNoexcept = [&](QualType T) -> bool { | ||||
10968 | // Strip off declarator chunks that could be between us and a function | ||||
10969 | // type. We don't need to look far, exception specifications are very | ||||
10970 | // restricted prior to C++17. | ||||
10971 | if (auto *RT = T->getAs<ReferenceType>()) | ||||
10972 | T = RT->getPointeeType(); | ||||
10973 | else if (T->isAnyPointerType()) | ||||
10974 | T = T->getPointeeType(); | ||||
10975 | else if (auto *MPT = T->getAs<MemberPointerType>()) | ||||
10976 | T = MPT->getPointeeType(); | ||||
10977 | if (auto *FPT = T->getAs<FunctionProtoType>()) | ||||
10978 | if (FPT->isNothrow()) | ||||
10979 | return true; | ||||
10980 | return false; | ||||
10981 | }; | ||||
10982 | |||||
10983 | auto *FPT = NewFD->getType()->castAs<FunctionProtoType>(); | ||||
10984 | bool AnyNoexcept = HasNoexcept(FPT->getReturnType()); | ||||
10985 | for (QualType T : FPT->param_types()) | ||||
10986 | AnyNoexcept |= HasNoexcept(T); | ||||
10987 | if (AnyNoexcept) | ||||
10988 | Diag(NewFD->getLocation(), | ||||
10989 | diag::warn_cxx17_compat_exception_spec_in_signature) | ||||
10990 | << NewFD; | ||||
10991 | } | ||||
10992 | |||||
10993 | if (!Redeclaration && LangOpts.CUDA) | ||||
10994 | checkCUDATargetOverload(NewFD, Previous); | ||||
10995 | } | ||||
10996 | return Redeclaration; | ||||
10997 | } | ||||
10998 | |||||
10999 | void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { | ||||
11000 | // C++11 [basic.start.main]p3: | ||||
11001 | // A program that [...] declares main to be inline, static or | ||||
11002 | // constexpr is ill-formed. | ||||
11003 | // C11 6.7.4p4: In a hosted environment, no function specifier(s) shall | ||||
11004 | // appear in a declaration of main. | ||||
11005 | // static main is not an error under C99, but we should warn about it. | ||||
11006 | // We accept _Noreturn main as an extension. | ||||
11007 | if (FD->getStorageClass() == SC_Static) | ||||
11008 | Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus | ||||
11009 | ? diag::err_static_main : diag::warn_static_main) | ||||
11010 | << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); | ||||
11011 | if (FD->isInlineSpecified()) | ||||
11012 | Diag(DS.getInlineSpecLoc(), diag::err_inline_main) | ||||
11013 | << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); | ||||
11014 | if (DS.isNoreturnSpecified()) { | ||||
11015 | SourceLocation NoreturnLoc = DS.getNoreturnSpecLoc(); | ||||
11016 | SourceRange NoreturnRange(NoreturnLoc, getLocForEndOfToken(NoreturnLoc)); | ||||
11017 | Diag(NoreturnLoc, diag::ext_noreturn_main); | ||||
11018 | Diag(NoreturnLoc, diag::note_main_remove_noreturn) | ||||
11019 | << FixItHint::CreateRemoval(NoreturnRange); | ||||
11020 | } | ||||
11021 | if (FD->isConstexpr()) { | ||||
11022 | Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) | ||||
11023 | << FD->isConsteval() | ||||
11024 | << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); | ||||
11025 | FD->setConstexprKind(ConstexprSpecKind::Unspecified); | ||||
11026 | } | ||||
11027 | |||||
11028 | if (getLangOpts().OpenCL) { | ||||
11029 | Diag(FD->getLocation(), diag::err_opencl_no_main) | ||||
11030 | << FD->hasAttr<OpenCLKernelAttr>(); | ||||
11031 | FD->setInvalidDecl(); | ||||
11032 | return; | ||||
11033 | } | ||||
11034 | |||||
11035 | QualType T = FD->getType(); | ||||
11036 | assert(T->isFunctionType() && "function decl is not of function type")((T->isFunctionType() && "function decl is not of function type" ) ? static_cast<void> (0) : __assert_fail ("T->isFunctionType() && \"function decl is not of function type\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11036, __PRETTY_FUNCTION__)); | ||||
11037 | const FunctionType* FT = T->castAs<FunctionType>(); | ||||
11038 | |||||
11039 | // Set default calling convention for main() | ||||
11040 | if (FT->getCallConv() != CC_C) { | ||||
11041 | FT = Context.adjustFunctionType(FT, FT->getExtInfo().withCallingConv(CC_C)); | ||||
11042 | FD->setType(QualType(FT, 0)); | ||||
11043 | T = Context.getCanonicalType(FD->getType()); | ||||
11044 | } | ||||
11045 | |||||
11046 | if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) { | ||||
11047 | // In C with GNU extensions we allow main() to have non-integer return | ||||
11048 | // type, but we should warn about the extension, and we disable the | ||||
11049 | // implicit-return-zero rule. | ||||
11050 | |||||
11051 | // GCC in C mode accepts qualified 'int'. | ||||
11052 | if (Context.hasSameUnqualifiedType(FT->getReturnType(), Context.IntTy)) | ||||
11053 | FD->setHasImplicitReturnZero(true); | ||||
11054 | else { | ||||
11055 | Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); | ||||
11056 | SourceRange RTRange = FD->getReturnTypeSourceRange(); | ||||
11057 | if (RTRange.isValid()) | ||||
11058 | Diag(RTRange.getBegin(), diag::note_main_change_return_type) | ||||
11059 | << FixItHint::CreateReplacement(RTRange, "int"); | ||||
11060 | } | ||||
11061 | } else { | ||||
11062 | // In C and C++, main magically returns 0 if you fall off the end; | ||||
11063 | // set the flag which tells us that. | ||||
11064 | // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. | ||||
11065 | |||||
11066 | // All the standards say that main() should return 'int'. | ||||
11067 | if (Context.hasSameType(FT->getReturnType(), Context.IntTy)) | ||||
11068 | FD->setHasImplicitReturnZero(true); | ||||
11069 | else { | ||||
11070 | // Otherwise, this is just a flat-out error. | ||||
11071 | SourceRange RTRange = FD->getReturnTypeSourceRange(); | ||||
11072 | Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint) | ||||
11073 | << (RTRange.isValid() ? FixItHint::CreateReplacement(RTRange, "int") | ||||
11074 | : FixItHint()); | ||||
11075 | FD->setInvalidDecl(true); | ||||
11076 | } | ||||
11077 | } | ||||
11078 | |||||
11079 | // Treat protoless main() as nullary. | ||||
11080 | if (isa<FunctionNoProtoType>(FT)) return; | ||||
11081 | |||||
11082 | const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); | ||||
11083 | unsigned nparams = FTP->getNumParams(); | ||||
11084 | assert(FD->getNumParams() == nparams)((FD->getNumParams() == nparams) ? static_cast<void> (0) : __assert_fail ("FD->getNumParams() == nparams", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11084, __PRETTY_FUNCTION__)); | ||||
11085 | |||||
11086 | bool HasExtraParameters = (nparams > 3); | ||||
11087 | |||||
11088 | if (FTP->isVariadic()) { | ||||
11089 | Diag(FD->getLocation(), diag::ext_variadic_main); | ||||
11090 | // FIXME: if we had information about the location of the ellipsis, we | ||||
11091 | // could add a FixIt hint to remove it as a parameter. | ||||
11092 | } | ||||
11093 | |||||
11094 | // Darwin passes an undocumented fourth argument of type char**. If | ||||
11095 | // other platforms start sprouting these, the logic below will start | ||||
11096 | // getting shifty. | ||||
11097 | if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) | ||||
11098 | HasExtraParameters = false; | ||||
11099 | |||||
11100 | if (HasExtraParameters) { | ||||
11101 | Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; | ||||
11102 | FD->setInvalidDecl(true); | ||||
11103 | nparams = 3; | ||||
11104 | } | ||||
11105 | |||||
11106 | // FIXME: a lot of the following diagnostics would be improved | ||||
11107 | // if we had some location information about types. | ||||
11108 | |||||
11109 | QualType CharPP = | ||||
11110 | Context.getPointerType(Context.getPointerType(Context.CharTy)); | ||||
11111 | QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; | ||||
11112 | |||||
11113 | for (unsigned i = 0; i < nparams; ++i) { | ||||
11114 | QualType AT = FTP->getParamType(i); | ||||
11115 | |||||
11116 | bool mismatch = true; | ||||
11117 | |||||
11118 | if (Context.hasSameUnqualifiedType(AT, Expected[i])) | ||||
11119 | mismatch = false; | ||||
11120 | else if (Expected[i] == CharPP) { | ||||
11121 | // As an extension, the following forms are okay: | ||||
11122 | // char const ** | ||||
11123 | // char const * const * | ||||
11124 | // char * const * | ||||
11125 | |||||
11126 | QualifierCollector qs; | ||||
11127 | const PointerType* PT; | ||||
11128 | if ((PT = qs.strip(AT)->getAs<PointerType>()) && | ||||
11129 | (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && | ||||
11130 | Context.hasSameType(QualType(qs.strip(PT->getPointeeType()), 0), | ||||
11131 | Context.CharTy)) { | ||||
11132 | qs.removeConst(); | ||||
11133 | mismatch = !qs.empty(); | ||||
11134 | } | ||||
11135 | } | ||||
11136 | |||||
11137 | if (mismatch) { | ||||
11138 | Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; | ||||
11139 | // TODO: suggest replacing given type with expected type | ||||
11140 | FD->setInvalidDecl(true); | ||||
11141 | } | ||||
11142 | } | ||||
11143 | |||||
11144 | if (nparams == 1 && !FD->isInvalidDecl()) { | ||||
11145 | Diag(FD->getLocation(), diag::warn_main_one_arg); | ||||
11146 | } | ||||
11147 | |||||
11148 | if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { | ||||
11149 | Diag(FD->getLocation(), diag::err_mainlike_template_decl) << FD; | ||||
11150 | FD->setInvalidDecl(); | ||||
11151 | } | ||||
11152 | } | ||||
11153 | |||||
11154 | void Sema::CheckMSVCRTEntryPoint(FunctionDecl *FD) { | ||||
11155 | QualType T = FD->getType(); | ||||
11156 | assert(T->isFunctionType() && "function decl is not of function type")((T->isFunctionType() && "function decl is not of function type" ) ? static_cast<void> (0) : __assert_fail ("T->isFunctionType() && \"function decl is not of function type\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11156, __PRETTY_FUNCTION__)); | ||||
11157 | const FunctionType *FT = T->castAs<FunctionType>(); | ||||
11158 | |||||
11159 | // Set an implicit return of 'zero' if the function can return some integral, | ||||
11160 | // enumeration, pointer or nullptr type. | ||||
11161 | if (FT->getReturnType()->isIntegralOrEnumerationType() || | ||||
11162 | FT->getReturnType()->isAnyPointerType() || | ||||
11163 | FT->getReturnType()->isNullPtrType()) | ||||
11164 | // DllMain is exempt because a return value of zero means it failed. | ||||
11165 | if (FD->getName() != "DllMain") | ||||
11166 | FD->setHasImplicitReturnZero(true); | ||||
11167 | |||||
11168 | if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { | ||||
11169 | Diag(FD->getLocation(), diag::err_mainlike_template_decl) << FD; | ||||
11170 | FD->setInvalidDecl(); | ||||
11171 | } | ||||
11172 | } | ||||
11173 | |||||
11174 | bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { | ||||
11175 | // FIXME: Need strict checking. In C89, we need to check for | ||||
11176 | // any assignment, increment, decrement, function-calls, or | ||||
11177 | // commas outside of a sizeof. In C99, it's the same list, | ||||
11178 | // except that the aforementioned are allowed in unevaluated | ||||
11179 | // expressions. Everything else falls under the | ||||
11180 | // "may accept other forms of constant expressions" exception. | ||||
11181 | // | ||||
11182 | // Regular C++ code will not end up here (exceptions: language extensions, | ||||
11183 | // OpenCL C++ etc), so the constant expression rules there don't matter. | ||||
11184 | if (Init->isValueDependent()) { | ||||
11185 | assert(Init->containsErrors() &&((Init->containsErrors() && "Dependent code should only occur in error-recovery path." ) ? static_cast<void> (0) : __assert_fail ("Init->containsErrors() && \"Dependent code should only occur in error-recovery path.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11186, __PRETTY_FUNCTION__)) | ||||
11186 | "Dependent code should only occur in error-recovery path.")((Init->containsErrors() && "Dependent code should only occur in error-recovery path." ) ? static_cast<void> (0) : __assert_fail ("Init->containsErrors() && \"Dependent code should only occur in error-recovery path.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11186, __PRETTY_FUNCTION__)); | ||||
11187 | return true; | ||||
11188 | } | ||||
11189 | const Expr *Culprit; | ||||
11190 | if (Init->isConstantInitializer(Context, false, &Culprit)) | ||||
11191 | return false; | ||||
11192 | Diag(Culprit->getExprLoc(), diag::err_init_element_not_constant) | ||||
11193 | << Culprit->getSourceRange(); | ||||
11194 | return true; | ||||
11195 | } | ||||
11196 | |||||
11197 | namespace { | ||||
11198 | // Visits an initialization expression to see if OrigDecl is evaluated in | ||||
11199 | // its own initialization and throws a warning if it does. | ||||
11200 | class SelfReferenceChecker | ||||
11201 | : public EvaluatedExprVisitor<SelfReferenceChecker> { | ||||
11202 | Sema &S; | ||||
11203 | Decl *OrigDecl; | ||||
11204 | bool isRecordType; | ||||
11205 | bool isPODType; | ||||
11206 | bool isReferenceType; | ||||
11207 | |||||
11208 | bool isInitList; | ||||
11209 | llvm::SmallVector<unsigned, 4> InitFieldIndex; | ||||
11210 | |||||
11211 | public: | ||||
11212 | typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; | ||||
11213 | |||||
11214 | SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), | ||||
11215 | S(S), OrigDecl(OrigDecl) { | ||||
11216 | isPODType = false; | ||||
11217 | isRecordType = false; | ||||
11218 | isReferenceType = false; | ||||
11219 | isInitList = false; | ||||
11220 | if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { | ||||
11221 | isPODType = VD->getType().isPODType(S.Context); | ||||
11222 | isRecordType = VD->getType()->isRecordType(); | ||||
11223 | isReferenceType = VD->getType()->isReferenceType(); | ||||
11224 | } | ||||
11225 | } | ||||
11226 | |||||
11227 | // For most expressions, just call the visitor. For initializer lists, | ||||
11228 | // track the index of the field being initialized since fields are | ||||
11229 | // initialized in order allowing use of previously initialized fields. | ||||
11230 | void CheckExpr(Expr *E) { | ||||
11231 | InitListExpr *InitList = dyn_cast<InitListExpr>(E); | ||||
11232 | if (!InitList) { | ||||
11233 | Visit(E); | ||||
11234 | return; | ||||
11235 | } | ||||
11236 | |||||
11237 | // Track and increment the index here. | ||||
11238 | isInitList = true; | ||||
11239 | InitFieldIndex.push_back(0); | ||||
11240 | for (auto Child : InitList->children()) { | ||||
11241 | CheckExpr(cast<Expr>(Child)); | ||||
11242 | ++InitFieldIndex.back(); | ||||
11243 | } | ||||
11244 | InitFieldIndex.pop_back(); | ||||
11245 | } | ||||
11246 | |||||
11247 | // Returns true if MemberExpr is checked and no further checking is needed. | ||||
11248 | // Returns false if additional checking is required. | ||||
11249 | bool CheckInitListMemberExpr(MemberExpr *E, bool CheckReference) { | ||||
11250 | llvm::SmallVector<FieldDecl*, 4> Fields; | ||||
11251 | Expr *Base = E; | ||||
11252 | bool ReferenceField = false; | ||||
11253 | |||||
11254 | // Get the field members used. | ||||
11255 | while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) { | ||||
11256 | FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()); | ||||
11257 | if (!FD) | ||||
11258 | return false; | ||||
11259 | Fields.push_back(FD); | ||||
11260 | if (FD->getType()->isReferenceType()) | ||||
11261 | ReferenceField = true; | ||||
11262 | Base = ME->getBase()->IgnoreParenImpCasts(); | ||||
11263 | } | ||||
11264 | |||||
11265 | // Keep checking only if the base Decl is the same. | ||||
11266 | DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base); | ||||
11267 | if (!DRE || DRE->getDecl() != OrigDecl) | ||||
11268 | return false; | ||||
11269 | |||||
11270 | // A reference field can be bound to an unininitialized field. | ||||
11271 | if (CheckReference && !ReferenceField) | ||||
11272 | return true; | ||||
11273 | |||||
11274 | // Convert FieldDecls to their index number. | ||||
11275 | llvm::SmallVector<unsigned, 4> UsedFieldIndex; | ||||
11276 | for (const FieldDecl *I : llvm::reverse(Fields)) | ||||
11277 | UsedFieldIndex.push_back(I->getFieldIndex()); | ||||
11278 | |||||
11279 | // See if a warning is needed by checking the first difference in index | ||||
11280 | // numbers. If field being used has index less than the field being | ||||
11281 | // initialized, then the use is safe. | ||||
11282 | for (auto UsedIter = UsedFieldIndex.begin(), | ||||
11283 | UsedEnd = UsedFieldIndex.end(), | ||||
11284 | OrigIter = InitFieldIndex.begin(), | ||||
11285 | OrigEnd = InitFieldIndex.end(); | ||||
11286 | UsedIter != UsedEnd && OrigIter != OrigEnd; ++UsedIter, ++OrigIter) { | ||||
11287 | if (*UsedIter < *OrigIter) | ||||
11288 | return true; | ||||
11289 | if (*UsedIter > *OrigIter) | ||||
11290 | break; | ||||
11291 | } | ||||
11292 | |||||
11293 | // TODO: Add a different warning which will print the field names. | ||||
11294 | HandleDeclRefExpr(DRE); | ||||
11295 | return true; | ||||
11296 | } | ||||
11297 | |||||
11298 | // For most expressions, the cast is directly above the DeclRefExpr. | ||||
11299 | // For conditional operators, the cast can be outside the conditional | ||||
11300 | // operator if both expressions are DeclRefExpr's. | ||||
11301 | void HandleValue(Expr *E) { | ||||
11302 | E = E->IgnoreParens(); | ||||
11303 | if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) { | ||||
11304 | HandleDeclRefExpr(DRE); | ||||
11305 | return; | ||||
11306 | } | ||||
11307 | |||||
11308 | if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { | ||||
11309 | Visit(CO->getCond()); | ||||
11310 | HandleValue(CO->getTrueExpr()); | ||||
11311 | HandleValue(CO->getFalseExpr()); | ||||
11312 | return; | ||||
11313 | } | ||||
11314 | |||||
11315 | if (BinaryConditionalOperator *BCO = | ||||
11316 | dyn_cast<BinaryConditionalOperator>(E)) { | ||||
11317 | Visit(BCO->getCond()); | ||||
11318 | HandleValue(BCO->getFalseExpr()); | ||||
11319 | return; | ||||
11320 | } | ||||
11321 | |||||
11322 | if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) { | ||||
11323 | HandleValue(OVE->getSourceExpr()); | ||||
11324 | return; | ||||
11325 | } | ||||
11326 | |||||
11327 | if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { | ||||
11328 | if (BO->getOpcode() == BO_Comma) { | ||||
11329 | Visit(BO->getLHS()); | ||||
11330 | HandleValue(BO->getRHS()); | ||||
11331 | return; | ||||
11332 | } | ||||
11333 | } | ||||
11334 | |||||
11335 | if (isa<MemberExpr>(E)) { | ||||
11336 | if (isInitList) { | ||||
11337 | if (CheckInitListMemberExpr(cast<MemberExpr>(E), | ||||
11338 | false /*CheckReference*/)) | ||||
11339 | return; | ||||
11340 | } | ||||
11341 | |||||
11342 | Expr *Base = E->IgnoreParenImpCasts(); | ||||
11343 | while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) { | ||||
11344 | // Check for static member variables and don't warn on them. | ||||
11345 | if (!isa<FieldDecl>(ME->getMemberDecl())) | ||||
11346 | return; | ||||
11347 | Base = ME->getBase()->IgnoreParenImpCasts(); | ||||
11348 | } | ||||
11349 | if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base)) | ||||
11350 | HandleDeclRefExpr(DRE); | ||||
11351 | return; | ||||
11352 | } | ||||
11353 | |||||
11354 | Visit(E); | ||||
11355 | } | ||||
11356 | |||||
11357 | // Reference types not handled in HandleValue are handled here since all | ||||
11358 | // uses of references are bad, not just r-value uses. | ||||
11359 | void VisitDeclRefExpr(DeclRefExpr *E) { | ||||
11360 | if (isReferenceType) | ||||
11361 | HandleDeclRefExpr(E); | ||||
11362 | } | ||||
11363 | |||||
11364 | void VisitImplicitCastExpr(ImplicitCastExpr *E) { | ||||
11365 | if (E->getCastKind() == CK_LValueToRValue) { | ||||
11366 | HandleValue(E->getSubExpr()); | ||||
11367 | return; | ||||
11368 | } | ||||
11369 | |||||
11370 | Inherited::VisitImplicitCastExpr(E); | ||||
11371 | } | ||||
11372 | |||||
11373 | void VisitMemberExpr(MemberExpr *E) { | ||||
11374 | if (isInitList) { | ||||
11375 | if (CheckInitListMemberExpr(E, true /*CheckReference*/)) | ||||
11376 | return; | ||||
11377 | } | ||||
11378 | |||||
11379 | // Don't warn on arrays since they can be treated as pointers. | ||||
11380 | if (E->getType()->canDecayToPointerType()) return; | ||||
11381 | |||||
11382 | // Warn when a non-static method call is followed by non-static member | ||||
11383 | // field accesses, which is followed by a DeclRefExpr. | ||||
11384 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl()); | ||||
11385 | bool Warn = (MD && !MD->isStatic()); | ||||
11386 | Expr *Base = E->getBase()->IgnoreParenImpCasts(); | ||||
11387 | while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) { | ||||
11388 | if (!isa<FieldDecl>(ME->getMemberDecl())) | ||||
11389 | Warn = false; | ||||
11390 | Base = ME->getBase()->IgnoreParenImpCasts(); | ||||
11391 | } | ||||
11392 | |||||
11393 | if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base)) { | ||||
11394 | if (Warn) | ||||
11395 | HandleDeclRefExpr(DRE); | ||||
11396 | return; | ||||
11397 | } | ||||
11398 | |||||
11399 | // The base of a MemberExpr is not a MemberExpr or a DeclRefExpr. | ||||
11400 | // Visit that expression. | ||||
11401 | Visit(Base); | ||||
11402 | } | ||||
11403 | |||||
11404 | void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) { | ||||
11405 | Expr *Callee = E->getCallee(); | ||||
11406 | |||||
11407 | if (isa<UnresolvedLookupExpr>(Callee)) | ||||
11408 | return Inherited::VisitCXXOperatorCallExpr(E); | ||||
11409 | |||||
11410 | Visit(Callee); | ||||
11411 | for (auto Arg: E->arguments()) | ||||
11412 | HandleValue(Arg->IgnoreParenImpCasts()); | ||||
11413 | } | ||||
11414 | |||||
11415 | void VisitUnaryOperator(UnaryOperator *E) { | ||||
11416 | // For POD record types, addresses of its own members are well-defined. | ||||
11417 | if (E->getOpcode() == UO_AddrOf && isRecordType && | ||||
11418 | isa<MemberExpr>(E->getSubExpr()->IgnoreParens())) { | ||||
11419 | if (!isPODType) | ||||
11420 | HandleValue(E->getSubExpr()); | ||||
11421 | return; | ||||
11422 | } | ||||
11423 | |||||
11424 | if (E->isIncrementDecrementOp()) { | ||||
11425 | HandleValue(E->getSubExpr()); | ||||
11426 | return; | ||||
11427 | } | ||||
11428 | |||||
11429 | Inherited::VisitUnaryOperator(E); | ||||
11430 | } | ||||
11431 | |||||
11432 | void VisitObjCMessageExpr(ObjCMessageExpr *E) {} | ||||
11433 | |||||
11434 | void VisitCXXConstructExpr(CXXConstructExpr *E) { | ||||
11435 | if (E->getConstructor()->isCopyConstructor()) { | ||||
11436 | Expr *ArgExpr = E->getArg(0); | ||||
11437 | if (InitListExpr *ILE = dyn_cast<InitListExpr>(ArgExpr)) | ||||
11438 | if (ILE->getNumInits() == 1) | ||||
11439 | ArgExpr = ILE->getInit(0); | ||||
11440 | if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr)) | ||||
11441 | if (ICE->getCastKind() == CK_NoOp) | ||||
11442 | ArgExpr = ICE->getSubExpr(); | ||||
11443 | HandleValue(ArgExpr); | ||||
11444 | return; | ||||
11445 | } | ||||
11446 | Inherited::VisitCXXConstructExpr(E); | ||||
11447 | } | ||||
11448 | |||||
11449 | void VisitCallExpr(CallExpr *E) { | ||||
11450 | // Treat std::move as a use. | ||||
11451 | if (E->isCallToStdMove()) { | ||||
11452 | HandleValue(E->getArg(0)); | ||||
11453 | return; | ||||
11454 | } | ||||
11455 | |||||
11456 | Inherited::VisitCallExpr(E); | ||||
11457 | } | ||||
11458 | |||||
11459 | void VisitBinaryOperator(BinaryOperator *E) { | ||||
11460 | if (E->isCompoundAssignmentOp()) { | ||||
11461 | HandleValue(E->getLHS()); | ||||
11462 | Visit(E->getRHS()); | ||||
11463 | return; | ||||
11464 | } | ||||
11465 | |||||
11466 | Inherited::VisitBinaryOperator(E); | ||||
11467 | } | ||||
11468 | |||||
11469 | // A custom visitor for BinaryConditionalOperator is needed because the | ||||
11470 | // regular visitor would check the condition and true expression separately | ||||
11471 | // but both point to the same place giving duplicate diagnostics. | ||||
11472 | void VisitBinaryConditionalOperator(BinaryConditionalOperator *E) { | ||||
11473 | Visit(E->getCond()); | ||||
11474 | Visit(E->getFalseExpr()); | ||||
11475 | } | ||||
11476 | |||||
11477 | void HandleDeclRefExpr(DeclRefExpr *DRE) { | ||||
11478 | Decl* ReferenceDecl = DRE->getDecl(); | ||||
11479 | if (OrigDecl != ReferenceDecl) return; | ||||
11480 | unsigned diag; | ||||
11481 | if (isReferenceType) { | ||||
11482 | diag = diag::warn_uninit_self_reference_in_reference_init; | ||||
11483 | } else if (cast<VarDecl>(OrigDecl)->isStaticLocal()) { | ||||
11484 | diag = diag::warn_static_self_reference_in_init; | ||||
11485 | } else if (isa<TranslationUnitDecl>(OrigDecl->getDeclContext()) || | ||||
11486 | isa<NamespaceDecl>(OrigDecl->getDeclContext()) || | ||||
11487 | DRE->getDecl()->getType()->isRecordType()) { | ||||
11488 | diag = diag::warn_uninit_self_reference_in_init; | ||||
11489 | } else { | ||||
11490 | // Local variables will be handled by the CFG analysis. | ||||
11491 | return; | ||||
11492 | } | ||||
11493 | |||||
11494 | S.DiagRuntimeBehavior(DRE->getBeginLoc(), DRE, | ||||
11495 | S.PDiag(diag) | ||||
11496 | << DRE->getDecl() << OrigDecl->getLocation() | ||||
11497 | << DRE->getSourceRange()); | ||||
11498 | } | ||||
11499 | }; | ||||
11500 | |||||
11501 | /// CheckSelfReference - Warns if OrigDecl is used in expression E. | ||||
11502 | static void CheckSelfReference(Sema &S, Decl* OrigDecl, Expr *E, | ||||
11503 | bool DirectInit) { | ||||
11504 | // Parameters arguments are occassionially constructed with itself, | ||||
11505 | // for instance, in recursive functions. Skip them. | ||||
11506 | if (isa<ParmVarDecl>(OrigDecl)) | ||||
11507 | return; | ||||
11508 | |||||
11509 | E = E->IgnoreParens(); | ||||
11510 | |||||
11511 | // Skip checking T a = a where T is not a record or reference type. | ||||
11512 | // Doing so is a way to silence uninitialized warnings. | ||||
11513 | if (!DirectInit && !cast<VarDecl>(OrigDecl)->getType()->isRecordType()) | ||||
11514 | if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) | ||||
11515 | if (ICE->getCastKind() == CK_LValueToRValue) | ||||
11516 | if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr())) | ||||
11517 | if (DRE->getDecl() == OrigDecl) | ||||
11518 | return; | ||||
11519 | |||||
11520 | SelfReferenceChecker(S, OrigDecl).CheckExpr(E); | ||||
11521 | } | ||||
11522 | } // end anonymous namespace | ||||
11523 | |||||
11524 | namespace { | ||||
11525 | // Simple wrapper to add the name of a variable or (if no variable is | ||||
11526 | // available) a DeclarationName into a diagnostic. | ||||
11527 | struct VarDeclOrName { | ||||
11528 | VarDecl *VDecl; | ||||
11529 | DeclarationName Name; | ||||
11530 | |||||
11531 | friend const Sema::SemaDiagnosticBuilder & | ||||
11532 | operator<<(const Sema::SemaDiagnosticBuilder &Diag, VarDeclOrName VN) { | ||||
11533 | return VN.VDecl ? Diag << VN.VDecl : Diag << VN.Name; | ||||
11534 | } | ||||
11535 | }; | ||||
11536 | } // end anonymous namespace | ||||
11537 | |||||
11538 | QualType Sema::deduceVarTypeFromInitializer(VarDecl *VDecl, | ||||
11539 | DeclarationName Name, QualType Type, | ||||
11540 | TypeSourceInfo *TSI, | ||||
11541 | SourceRange Range, bool DirectInit, | ||||
11542 | Expr *Init) { | ||||
11543 | bool IsInitCapture = !VDecl; | ||||
11544 | assert((!VDecl || !VDecl->isInitCapture()) &&(((!VDecl || !VDecl->isInitCapture()) && "init captures are expected to be deduced prior to initialization" ) ? static_cast<void> (0) : __assert_fail ("(!VDecl || !VDecl->isInitCapture()) && \"init captures are expected to be deduced prior to initialization\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11545, __PRETTY_FUNCTION__)) | ||||
11545 | "init captures are expected to be deduced prior to initialization")(((!VDecl || !VDecl->isInitCapture()) && "init captures are expected to be deduced prior to initialization" ) ? static_cast<void> (0) : __assert_fail ("(!VDecl || !VDecl->isInitCapture()) && \"init captures are expected to be deduced prior to initialization\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11545, __PRETTY_FUNCTION__)); | ||||
11546 | |||||
11547 | VarDeclOrName VN{VDecl, Name}; | ||||
11548 | |||||
11549 | DeducedType *Deduced = Type->getContainedDeducedType(); | ||||
11550 | assert(Deduced && "deduceVarTypeFromInitializer for non-deduced type")((Deduced && "deduceVarTypeFromInitializer for non-deduced type" ) ? static_cast<void> (0) : __assert_fail ("Deduced && \"deduceVarTypeFromInitializer for non-deduced type\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11550, __PRETTY_FUNCTION__)); | ||||
11551 | |||||
11552 | // C++11 [dcl.spec.auto]p3 | ||||
11553 | if (!Init) { | ||||
11554 | assert(VDecl && "no init for init capture deduction?")((VDecl && "no init for init capture deduction?") ? static_cast <void> (0) : __assert_fail ("VDecl && \"no init for init capture deduction?\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11554, __PRETTY_FUNCTION__)); | ||||
11555 | |||||
11556 | // Except for class argument deduction, and then for an initializing | ||||
11557 | // declaration only, i.e. no static at class scope or extern. | ||||
11558 | if (!isa<DeducedTemplateSpecializationType>(Deduced) || | ||||
11559 | VDecl->hasExternalStorage() || | ||||
11560 | VDecl->isStaticDataMember()) { | ||||
11561 | Diag(VDecl->getLocation(), diag::err_auto_var_requires_init) | ||||
11562 | << VDecl->getDeclName() << Type; | ||||
11563 | return QualType(); | ||||
11564 | } | ||||
11565 | } | ||||
11566 | |||||
11567 | ArrayRef<Expr*> DeduceInits; | ||||
11568 | if (Init) | ||||
11569 | DeduceInits = Init; | ||||
11570 | |||||
11571 | if (DirectInit) { | ||||
11572 | if (auto *PL = dyn_cast_or_null<ParenListExpr>(Init)) | ||||
11573 | DeduceInits = PL->exprs(); | ||||
11574 | } | ||||
11575 | |||||
11576 | if (isa<DeducedTemplateSpecializationType>(Deduced)) { | ||||
11577 | assert(VDecl && "non-auto type for init capture deduction?")((VDecl && "non-auto type for init capture deduction?" ) ? static_cast<void> (0) : __assert_fail ("VDecl && \"non-auto type for init capture deduction?\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11577, __PRETTY_FUNCTION__)); | ||||
11578 | InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); | ||||
11579 | InitializationKind Kind = InitializationKind::CreateForInit( | ||||
11580 | VDecl->getLocation(), DirectInit, Init); | ||||
11581 | // FIXME: Initialization should not be taking a mutable list of inits. | ||||
11582 | SmallVector<Expr*, 8> InitsCopy(DeduceInits.begin(), DeduceInits.end()); | ||||
11583 | return DeduceTemplateSpecializationFromInitializer(TSI, Entity, Kind, | ||||
11584 | InitsCopy); | ||||
11585 | } | ||||
11586 | |||||
11587 | if (DirectInit) { | ||||
11588 | if (auto *IL = dyn_cast<InitListExpr>(Init)) | ||||
11589 | DeduceInits = IL->inits(); | ||||
11590 | } | ||||
11591 | |||||
11592 | // Deduction only works if we have exactly one source expression. | ||||
11593 | if (DeduceInits.empty()) { | ||||
11594 | // It isn't possible to write this directly, but it is possible to | ||||
11595 | // end up in this situation with "auto x(some_pack...);" | ||||
11596 | Diag(Init->getBeginLoc(), IsInitCapture | ||||
11597 | ? diag::err_init_capture_no_expression | ||||
11598 | : diag::err_auto_var_init_no_expression) | ||||
11599 | << VN << Type << Range; | ||||
11600 | return QualType(); | ||||
11601 | } | ||||
11602 | |||||
11603 | if (DeduceInits.size() > 1) { | ||||
11604 | Diag(DeduceInits[1]->getBeginLoc(), | ||||
11605 | IsInitCapture ? diag::err_init_capture_multiple_expressions | ||||
11606 | : diag::err_auto_var_init_multiple_expressions) | ||||
11607 | << VN << Type << Range; | ||||
11608 | return QualType(); | ||||
11609 | } | ||||
11610 | |||||
11611 | Expr *DeduceInit = DeduceInits[0]; | ||||
11612 | if (DirectInit && isa<InitListExpr>(DeduceInit)) { | ||||
11613 | Diag(Init->getBeginLoc(), IsInitCapture | ||||
11614 | ? diag::err_init_capture_paren_braces | ||||
11615 | : diag::err_auto_var_init_paren_braces) | ||||
11616 | << isa<InitListExpr>(Init) << VN << Type << Range; | ||||
11617 | return QualType(); | ||||
11618 | } | ||||
11619 | |||||
11620 | // Expressions default to 'id' when we're in a debugger. | ||||
11621 | bool DefaultedAnyToId = false; | ||||
11622 | if (getLangOpts().DebuggerCastResultToId && | ||||
11623 | Init->getType() == Context.UnknownAnyTy && !IsInitCapture) { | ||||
11624 | ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); | ||||
11625 | if (Result.isInvalid()) { | ||||
11626 | return QualType(); | ||||
11627 | } | ||||
11628 | Init = Result.get(); | ||||
11629 | DefaultedAnyToId = true; | ||||
11630 | } | ||||
11631 | |||||
11632 | // C++ [dcl.decomp]p1: | ||||
11633 | // If the assignment-expression [...] has array type A and no ref-qualifier | ||||
11634 | // is present, e has type cv A | ||||
11635 | if (VDecl && isa<DecompositionDecl>(VDecl) && | ||||
11636 | Context.hasSameUnqualifiedType(Type, Context.getAutoDeductType()) && | ||||
11637 | DeduceInit->getType()->isConstantArrayType()) | ||||
11638 | return Context.getQualifiedType(DeduceInit->getType(), | ||||
11639 | Type.getQualifiers()); | ||||
11640 | |||||
11641 | QualType DeducedType; | ||||
11642 | if (DeduceAutoType(TSI, DeduceInit, DeducedType) == DAR_Failed) { | ||||
11643 | if (!IsInitCapture) | ||||
11644 | DiagnoseAutoDeductionFailure(VDecl, DeduceInit); | ||||
11645 | else if (isa<InitListExpr>(Init)) | ||||
11646 | Diag(Range.getBegin(), | ||||
11647 | diag::err_init_capture_deduction_failure_from_init_list) | ||||
11648 | << VN | ||||
11649 | << (DeduceInit->getType().isNull() ? TSI->getType() | ||||
11650 | : DeduceInit->getType()) | ||||
11651 | << DeduceInit->getSourceRange(); | ||||
11652 | else | ||||
11653 | Diag(Range.getBegin(), diag::err_init_capture_deduction_failure) | ||||
11654 | << VN << TSI->getType() | ||||
11655 | << (DeduceInit->getType().isNull() ? TSI->getType() | ||||
11656 | : DeduceInit->getType()) | ||||
11657 | << DeduceInit->getSourceRange(); | ||||
11658 | } | ||||
11659 | |||||
11660 | // Warn if we deduced 'id'. 'auto' usually implies type-safety, but using | ||||
11661 | // 'id' instead of a specific object type prevents most of our usual | ||||
11662 | // checks. | ||||
11663 | // We only want to warn outside of template instantiations, though: | ||||
11664 | // inside a template, the 'id' could have come from a parameter. | ||||
11665 | if (!inTemplateInstantiation() && !DefaultedAnyToId && !IsInitCapture && | ||||
11666 | !DeducedType.isNull() && DeducedType->isObjCIdType()) { | ||||
11667 | SourceLocation Loc = TSI->getTypeLoc().getBeginLoc(); | ||||
11668 | Diag(Loc, diag::warn_auto_var_is_id) << VN << Range; | ||||
11669 | } | ||||
11670 | |||||
11671 | return DeducedType; | ||||
11672 | } | ||||
11673 | |||||
11674 | bool Sema::DeduceVariableDeclarationType(VarDecl *VDecl, bool DirectInit, | ||||
11675 | Expr *Init) { | ||||
11676 | assert(!Init || !Init->containsErrors())((!Init || !Init->containsErrors()) ? static_cast<void> (0) : __assert_fail ("!Init || !Init->containsErrors()", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11676, __PRETTY_FUNCTION__)); | ||||
11677 | QualType DeducedType = deduceVarTypeFromInitializer( | ||||
11678 | VDecl, VDecl->getDeclName(), VDecl->getType(), VDecl->getTypeSourceInfo(), | ||||
11679 | VDecl->getSourceRange(), DirectInit, Init); | ||||
11680 | if (DeducedType.isNull()) { | ||||
11681 | VDecl->setInvalidDecl(); | ||||
11682 | return true; | ||||
11683 | } | ||||
11684 | |||||
11685 | VDecl->setType(DeducedType); | ||||
11686 | assert(VDecl->isLinkageValid())((VDecl->isLinkageValid()) ? static_cast<void> (0) : __assert_fail ("VDecl->isLinkageValid()", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11686, __PRETTY_FUNCTION__)); | ||||
11687 | |||||
11688 | // In ARC, infer lifetime. | ||||
11689 | if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) | ||||
11690 | VDecl->setInvalidDecl(); | ||||
11691 | |||||
11692 | if (getLangOpts().OpenCL) | ||||
11693 | deduceOpenCLAddressSpace(VDecl); | ||||
11694 | |||||
11695 | // If this is a redeclaration, check that the type we just deduced matches | ||||
11696 | // the previously declared type. | ||||
11697 | if (VarDecl *Old = VDecl->getPreviousDecl()) { | ||||
11698 | // We never need to merge the type, because we cannot form an incomplete | ||||
11699 | // array of auto, nor deduce such a type. | ||||
11700 | MergeVarDeclTypes(VDecl, Old, /*MergeTypeWithPrevious*/ false); | ||||
11701 | } | ||||
11702 | |||||
11703 | // Check the deduced type is valid for a variable declaration. | ||||
11704 | CheckVariableDeclarationType(VDecl); | ||||
11705 | return VDecl->isInvalidDecl(); | ||||
11706 | } | ||||
11707 | |||||
11708 | void Sema::checkNonTrivialCUnionInInitializer(const Expr *Init, | ||||
11709 | SourceLocation Loc) { | ||||
11710 | if (auto *EWC = dyn_cast<ExprWithCleanups>(Init)) | ||||
11711 | Init = EWC->getSubExpr(); | ||||
11712 | |||||
11713 | if (auto *CE = dyn_cast<ConstantExpr>(Init)) | ||||
11714 | Init = CE->getSubExpr(); | ||||
11715 | |||||
11716 | QualType InitType = Init->getType(); | ||||
11717 | assert((InitType.hasNonTrivialToPrimitiveDefaultInitializeCUnion() ||(((InitType.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || InitType.hasNonTrivialToPrimitiveCopyCUnion()) && "shouldn't be called if type doesn't have a non-trivial C struct" ) ? static_cast<void> (0) : __assert_fail ("(InitType.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || InitType.hasNonTrivialToPrimitiveCopyCUnion()) && \"shouldn't be called if type doesn't have a non-trivial C struct\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11719, __PRETTY_FUNCTION__)) | ||||
11718 | InitType.hasNonTrivialToPrimitiveCopyCUnion()) &&(((InitType.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || InitType.hasNonTrivialToPrimitiveCopyCUnion()) && "shouldn't be called if type doesn't have a non-trivial C struct" ) ? static_cast<void> (0) : __assert_fail ("(InitType.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || InitType.hasNonTrivialToPrimitiveCopyCUnion()) && \"shouldn't be called if type doesn't have a non-trivial C struct\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11719, __PRETTY_FUNCTION__)) | ||||
11719 | "shouldn't be called if type doesn't have a non-trivial C struct")(((InitType.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || InitType.hasNonTrivialToPrimitiveCopyCUnion()) && "shouldn't be called if type doesn't have a non-trivial C struct" ) ? static_cast<void> (0) : __assert_fail ("(InitType.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || InitType.hasNonTrivialToPrimitiveCopyCUnion()) && \"shouldn't be called if type doesn't have a non-trivial C struct\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11719, __PRETTY_FUNCTION__)); | ||||
11720 | if (auto *ILE = dyn_cast<InitListExpr>(Init)) { | ||||
11721 | for (auto I : ILE->inits()) { | ||||
11722 | if (!I->getType().hasNonTrivialToPrimitiveDefaultInitializeCUnion() && | ||||
11723 | !I->getType().hasNonTrivialToPrimitiveCopyCUnion()) | ||||
11724 | continue; | ||||
11725 | SourceLocation SL = I->getExprLoc(); | ||||
11726 | checkNonTrivialCUnionInInitializer(I, SL.isValid() ? SL : Loc); | ||||
11727 | } | ||||
11728 | return; | ||||
11729 | } | ||||
11730 | |||||
11731 | if (isa<ImplicitValueInitExpr>(Init)) { | ||||
11732 | if (InitType.hasNonTrivialToPrimitiveDefaultInitializeCUnion()) | ||||
11733 | checkNonTrivialCUnion(InitType, Loc, NTCUC_DefaultInitializedObject, | ||||
11734 | NTCUK_Init); | ||||
11735 | } else { | ||||
11736 | // Assume all other explicit initializers involving copying some existing | ||||
11737 | // object. | ||||
11738 | // TODO: ignore any explicit initializers where we can guarantee | ||||
11739 | // copy-elision. | ||||
11740 | if (InitType.hasNonTrivialToPrimitiveCopyCUnion()) | ||||
11741 | checkNonTrivialCUnion(InitType, Loc, NTCUC_CopyInit, NTCUK_Copy); | ||||
11742 | } | ||||
11743 | } | ||||
11744 | |||||
11745 | namespace { | ||||
11746 | |||||
11747 | bool shouldIgnoreForRecordTriviality(const FieldDecl *FD) { | ||||
11748 | // Ignore unavailable fields. A field can be marked as unavailable explicitly | ||||
11749 | // in the source code or implicitly by the compiler if it is in a union | ||||
11750 | // defined in a system header and has non-trivial ObjC ownership | ||||
11751 | // qualifications. We don't want those fields to participate in determining | ||||
11752 | // whether the containing union is non-trivial. | ||||
11753 | return FD->hasAttr<UnavailableAttr>(); | ||||
11754 | } | ||||
11755 | |||||
11756 | struct DiagNonTrivalCUnionDefaultInitializeVisitor | ||||
11757 | : DefaultInitializedTypeVisitor<DiagNonTrivalCUnionDefaultInitializeVisitor, | ||||
11758 | void> { | ||||
11759 | using Super = | ||||
11760 | DefaultInitializedTypeVisitor<DiagNonTrivalCUnionDefaultInitializeVisitor, | ||||
11761 | void>; | ||||
11762 | |||||
11763 | DiagNonTrivalCUnionDefaultInitializeVisitor( | ||||
11764 | QualType OrigTy, SourceLocation OrigLoc, | ||||
11765 | Sema::NonTrivialCUnionContext UseContext, Sema &S) | ||||
11766 | : OrigTy(OrigTy), OrigLoc(OrigLoc), UseContext(UseContext), S(S) {} | ||||
11767 | |||||
11768 | void visitWithKind(QualType::PrimitiveDefaultInitializeKind PDIK, QualType QT, | ||||
11769 | const FieldDecl *FD, bool InNonTrivialUnion) { | ||||
11770 | if (const auto *AT = S.Context.getAsArrayType(QT)) | ||||
11771 | return this->asDerived().visit(S.Context.getBaseElementType(AT), FD, | ||||
11772 | InNonTrivialUnion); | ||||
11773 | return Super::visitWithKind(PDIK, QT, FD, InNonTrivialUnion); | ||||
11774 | } | ||||
11775 | |||||
11776 | void visitARCStrong(QualType QT, const FieldDecl *FD, | ||||
11777 | bool InNonTrivialUnion) { | ||||
11778 | if (InNonTrivialUnion) | ||||
11779 | S.Diag(FD->getLocation(), diag::note_non_trivial_c_union) | ||||
11780 | << 1 << 0 << QT << FD->getName(); | ||||
11781 | } | ||||
11782 | |||||
11783 | void visitARCWeak(QualType QT, const FieldDecl *FD, bool InNonTrivialUnion) { | ||||
11784 | if (InNonTrivialUnion) | ||||
11785 | S.Diag(FD->getLocation(), diag::note_non_trivial_c_union) | ||||
11786 | << 1 << 0 << QT << FD->getName(); | ||||
11787 | } | ||||
11788 | |||||
11789 | void visitStruct(QualType QT, const FieldDecl *FD, bool InNonTrivialUnion) { | ||||
11790 | const RecordDecl *RD = QT->castAs<RecordType>()->getDecl(); | ||||
11791 | if (RD->isUnion()) { | ||||
11792 | if (OrigLoc.isValid()) { | ||||
11793 | bool IsUnion = false; | ||||
11794 | if (auto *OrigRD = OrigTy->getAsRecordDecl()) | ||||
11795 | IsUnion = OrigRD->isUnion(); | ||||
11796 | S.Diag(OrigLoc, diag::err_non_trivial_c_union_in_invalid_context) | ||||
11797 | << 0 << OrigTy << IsUnion << UseContext; | ||||
11798 | // Reset OrigLoc so that this diagnostic is emitted only once. | ||||
11799 | OrigLoc = SourceLocation(); | ||||
11800 | } | ||||
11801 | InNonTrivialUnion = true; | ||||
11802 | } | ||||
11803 | |||||
11804 | if (InNonTrivialUnion) | ||||
11805 | S.Diag(RD->getLocation(), diag::note_non_trivial_c_union) | ||||
11806 | << 0 << 0 << QT.getUnqualifiedType() << ""; | ||||
11807 | |||||
11808 | for (const FieldDecl *FD : RD->fields()) | ||||
11809 | if (!shouldIgnoreForRecordTriviality(FD)) | ||||
11810 | asDerived().visit(FD->getType(), FD, InNonTrivialUnion); | ||||
11811 | } | ||||
11812 | |||||
11813 | void visitTrivial(QualType QT, const FieldDecl *FD, bool InNonTrivialUnion) {} | ||||
11814 | |||||
11815 | // The non-trivial C union type or the struct/union type that contains a | ||||
11816 | // non-trivial C union. | ||||
11817 | QualType OrigTy; | ||||
11818 | SourceLocation OrigLoc; | ||||
11819 | Sema::NonTrivialCUnionContext UseContext; | ||||
11820 | Sema &S; | ||||
11821 | }; | ||||
11822 | |||||
11823 | struct DiagNonTrivalCUnionDestructedTypeVisitor | ||||
11824 | : DestructedTypeVisitor<DiagNonTrivalCUnionDestructedTypeVisitor, void> { | ||||
11825 | using Super = | ||||
11826 | DestructedTypeVisitor<DiagNonTrivalCUnionDestructedTypeVisitor, void>; | ||||
11827 | |||||
11828 | DiagNonTrivalCUnionDestructedTypeVisitor( | ||||
11829 | QualType OrigTy, SourceLocation OrigLoc, | ||||
11830 | Sema::NonTrivialCUnionContext UseContext, Sema &S) | ||||
11831 | : OrigTy(OrigTy), OrigLoc(OrigLoc), UseContext(UseContext), S(S) {} | ||||
11832 | |||||
11833 | void visitWithKind(QualType::DestructionKind DK, QualType QT, | ||||
11834 | const FieldDecl *FD, bool InNonTrivialUnion) { | ||||
11835 | if (const auto *AT = S.Context.getAsArrayType(QT)) | ||||
11836 | return this->asDerived().visit(S.Context.getBaseElementType(AT), FD, | ||||
11837 | InNonTrivialUnion); | ||||
11838 | return Super::visitWithKind(DK, QT, FD, InNonTrivialUnion); | ||||
11839 | } | ||||
11840 | |||||
11841 | void visitARCStrong(QualType QT, const FieldDecl *FD, | ||||
11842 | bool InNonTrivialUnion) { | ||||
11843 | if (InNonTrivialUnion) | ||||
11844 | S.Diag(FD->getLocation(), diag::note_non_trivial_c_union) | ||||
11845 | << 1 << 1 << QT << FD->getName(); | ||||
11846 | } | ||||
11847 | |||||
11848 | void visitARCWeak(QualType QT, const FieldDecl *FD, bool InNonTrivialUnion) { | ||||
11849 | if (InNonTrivialUnion) | ||||
11850 | S.Diag(FD->getLocation(), diag::note_non_trivial_c_union) | ||||
11851 | << 1 << 1 << QT << FD->getName(); | ||||
11852 | } | ||||
11853 | |||||
11854 | void visitStruct(QualType QT, const FieldDecl *FD, bool InNonTrivialUnion) { | ||||
11855 | const RecordDecl *RD = QT->castAs<RecordType>()->getDecl(); | ||||
11856 | if (RD->isUnion()) { | ||||
11857 | if (OrigLoc.isValid()) { | ||||
11858 | bool IsUnion = false; | ||||
11859 | if (auto *OrigRD = OrigTy->getAsRecordDecl()) | ||||
11860 | IsUnion = OrigRD->isUnion(); | ||||
11861 | S.Diag(OrigLoc, diag::err_non_trivial_c_union_in_invalid_context) | ||||
11862 | << 1 << OrigTy << IsUnion << UseContext; | ||||
11863 | // Reset OrigLoc so that this diagnostic is emitted only once. | ||||
11864 | OrigLoc = SourceLocation(); | ||||
11865 | } | ||||
11866 | InNonTrivialUnion = true; | ||||
11867 | } | ||||
11868 | |||||
11869 | if (InNonTrivialUnion) | ||||
11870 | S.Diag(RD->getLocation(), diag::note_non_trivial_c_union) | ||||
11871 | << 0 << 1 << QT.getUnqualifiedType() << ""; | ||||
11872 | |||||
11873 | for (const FieldDecl *FD : RD->fields()) | ||||
11874 | if (!shouldIgnoreForRecordTriviality(FD)) | ||||
11875 | asDerived().visit(FD->getType(), FD, InNonTrivialUnion); | ||||
11876 | } | ||||
11877 | |||||
11878 | void visitTrivial(QualType QT, const FieldDecl *FD, bool InNonTrivialUnion) {} | ||||
11879 | void visitCXXDestructor(QualType QT, const FieldDecl *FD, | ||||
11880 | bool InNonTrivialUnion) {} | ||||
11881 | |||||
11882 | // The non-trivial C union type or the struct/union type that contains a | ||||
11883 | // non-trivial C union. | ||||
11884 | QualType OrigTy; | ||||
11885 | SourceLocation OrigLoc; | ||||
11886 | Sema::NonTrivialCUnionContext UseContext; | ||||
11887 | Sema &S; | ||||
11888 | }; | ||||
11889 | |||||
11890 | struct DiagNonTrivalCUnionCopyVisitor | ||||
11891 | : CopiedTypeVisitor<DiagNonTrivalCUnionCopyVisitor, false, void> { | ||||
11892 | using Super = CopiedTypeVisitor<DiagNonTrivalCUnionCopyVisitor, false, void>; | ||||
11893 | |||||
11894 | DiagNonTrivalCUnionCopyVisitor(QualType OrigTy, SourceLocation OrigLoc, | ||||
11895 | Sema::NonTrivialCUnionContext UseContext, | ||||
11896 | Sema &S) | ||||
11897 | : OrigTy(OrigTy), OrigLoc(OrigLoc), UseContext(UseContext), S(S) {} | ||||
11898 | |||||
11899 | void visitWithKind(QualType::PrimitiveCopyKind PCK, QualType QT, | ||||
11900 | const FieldDecl *FD, bool InNonTrivialUnion) { | ||||
11901 | if (const auto *AT = S.Context.getAsArrayType(QT)) | ||||
11902 | return this->asDerived().visit(S.Context.getBaseElementType(AT), FD, | ||||
11903 | InNonTrivialUnion); | ||||
11904 | return Super::visitWithKind(PCK, QT, FD, InNonTrivialUnion); | ||||
11905 | } | ||||
11906 | |||||
11907 | void visitARCStrong(QualType QT, const FieldDecl *FD, | ||||
11908 | bool InNonTrivialUnion) { | ||||
11909 | if (InNonTrivialUnion) | ||||
11910 | S.Diag(FD->getLocation(), diag::note_non_trivial_c_union) | ||||
11911 | << 1 << 2 << QT << FD->getName(); | ||||
11912 | } | ||||
11913 | |||||
11914 | void visitARCWeak(QualType QT, const FieldDecl *FD, bool InNonTrivialUnion) { | ||||
11915 | if (InNonTrivialUnion) | ||||
11916 | S.Diag(FD->getLocation(), diag::note_non_trivial_c_union) | ||||
11917 | << 1 << 2 << QT << FD->getName(); | ||||
11918 | } | ||||
11919 | |||||
11920 | void visitStruct(QualType QT, const FieldDecl *FD, bool InNonTrivialUnion) { | ||||
11921 | const RecordDecl *RD = QT->castAs<RecordType>()->getDecl(); | ||||
11922 | if (RD->isUnion()) { | ||||
11923 | if (OrigLoc.isValid()) { | ||||
11924 | bool IsUnion = false; | ||||
11925 | if (auto *OrigRD = OrigTy->getAsRecordDecl()) | ||||
11926 | IsUnion = OrigRD->isUnion(); | ||||
11927 | S.Diag(OrigLoc, diag::err_non_trivial_c_union_in_invalid_context) | ||||
11928 | << 2 << OrigTy << IsUnion << UseContext; | ||||
11929 | // Reset OrigLoc so that this diagnostic is emitted only once. | ||||
11930 | OrigLoc = SourceLocation(); | ||||
11931 | } | ||||
11932 | InNonTrivialUnion = true; | ||||
11933 | } | ||||
11934 | |||||
11935 | if (InNonTrivialUnion) | ||||
11936 | S.Diag(RD->getLocation(), diag::note_non_trivial_c_union) | ||||
11937 | << 0 << 2 << QT.getUnqualifiedType() << ""; | ||||
11938 | |||||
11939 | for (const FieldDecl *FD : RD->fields()) | ||||
11940 | if (!shouldIgnoreForRecordTriviality(FD)) | ||||
11941 | asDerived().visit(FD->getType(), FD, InNonTrivialUnion); | ||||
11942 | } | ||||
11943 | |||||
11944 | void preVisit(QualType::PrimitiveCopyKind PCK, QualType QT, | ||||
11945 | const FieldDecl *FD, bool InNonTrivialUnion) {} | ||||
11946 | void visitTrivial(QualType QT, const FieldDecl *FD, bool InNonTrivialUnion) {} | ||||
11947 | void visitVolatileTrivial(QualType QT, const FieldDecl *FD, | ||||
11948 | bool InNonTrivialUnion) {} | ||||
11949 | |||||
11950 | // The non-trivial C union type or the struct/union type that contains a | ||||
11951 | // non-trivial C union. | ||||
11952 | QualType OrigTy; | ||||
11953 | SourceLocation OrigLoc; | ||||
11954 | Sema::NonTrivialCUnionContext UseContext; | ||||
11955 | Sema &S; | ||||
11956 | }; | ||||
11957 | |||||
11958 | } // namespace | ||||
11959 | |||||
11960 | void Sema::checkNonTrivialCUnion(QualType QT, SourceLocation Loc, | ||||
11961 | NonTrivialCUnionContext UseContext, | ||||
11962 | unsigned NonTrivialKind) { | ||||
11963 | assert((QT.hasNonTrivialToPrimitiveDefaultInitializeCUnion() ||(((QT.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || QT .hasNonTrivialToPrimitiveDestructCUnion() || QT.hasNonTrivialToPrimitiveCopyCUnion ()) && "shouldn't be called if type doesn't have a non-trivial C union" ) ? static_cast<void> (0) : __assert_fail ("(QT.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || QT.hasNonTrivialToPrimitiveDestructCUnion() || QT.hasNonTrivialToPrimitiveCopyCUnion()) && \"shouldn't be called if type doesn't have a non-trivial C union\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11966, __PRETTY_FUNCTION__)) | ||||
11964 | QT.hasNonTrivialToPrimitiveDestructCUnion() ||(((QT.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || QT .hasNonTrivialToPrimitiveDestructCUnion() || QT.hasNonTrivialToPrimitiveCopyCUnion ()) && "shouldn't be called if type doesn't have a non-trivial C union" ) ? static_cast<void> (0) : __assert_fail ("(QT.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || QT.hasNonTrivialToPrimitiveDestructCUnion() || QT.hasNonTrivialToPrimitiveCopyCUnion()) && \"shouldn't be called if type doesn't have a non-trivial C union\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11966, __PRETTY_FUNCTION__)) | ||||
11965 | QT.hasNonTrivialToPrimitiveCopyCUnion()) &&(((QT.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || QT .hasNonTrivialToPrimitiveDestructCUnion() || QT.hasNonTrivialToPrimitiveCopyCUnion ()) && "shouldn't be called if type doesn't have a non-trivial C union" ) ? static_cast<void> (0) : __assert_fail ("(QT.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || QT.hasNonTrivialToPrimitiveDestructCUnion() || QT.hasNonTrivialToPrimitiveCopyCUnion()) && \"shouldn't be called if type doesn't have a non-trivial C union\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11966, __PRETTY_FUNCTION__)) | ||||
11966 | "shouldn't be called if type doesn't have a non-trivial C union")(((QT.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || QT .hasNonTrivialToPrimitiveDestructCUnion() || QT.hasNonTrivialToPrimitiveCopyCUnion ()) && "shouldn't be called if type doesn't have a non-trivial C union" ) ? static_cast<void> (0) : __assert_fail ("(QT.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || QT.hasNonTrivialToPrimitiveDestructCUnion() || QT.hasNonTrivialToPrimitiveCopyCUnion()) && \"shouldn't be called if type doesn't have a non-trivial C union\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 11966, __PRETTY_FUNCTION__)); | ||||
11967 | |||||
11968 | if ((NonTrivialKind & NTCUK_Init) && | ||||
11969 | QT.hasNonTrivialToPrimitiveDefaultInitializeCUnion()) | ||||
11970 | DiagNonTrivalCUnionDefaultInitializeVisitor(QT, Loc, UseContext, *this) | ||||
11971 | .visit(QT, nullptr, false); | ||||
11972 | if ((NonTrivialKind & NTCUK_Destruct) && | ||||
11973 | QT.hasNonTrivialToPrimitiveDestructCUnion()) | ||||
11974 | DiagNonTrivalCUnionDestructedTypeVisitor(QT, Loc, UseContext, *this) | ||||
11975 | .visit(QT, nullptr, false); | ||||
11976 | if ((NonTrivialKind & NTCUK_Copy) && QT.hasNonTrivialToPrimitiveCopyCUnion()) | ||||
11977 | DiagNonTrivalCUnionCopyVisitor(QT, Loc, UseContext, *this) | ||||
11978 | .visit(QT, nullptr, false); | ||||
11979 | } | ||||
11980 | |||||
11981 | /// AddInitializerToDecl - Adds the initializer Init to the | ||||
11982 | /// declaration dcl. If DirectInit is true, this is C++ direct | ||||
11983 | /// initialization rather than copy initialization. | ||||
11984 | void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, bool DirectInit) { | ||||
11985 | // If there is no declaration, there was an error parsing it. Just ignore | ||||
11986 | // the initializer. | ||||
11987 | if (!RealDecl || RealDecl->isInvalidDecl()) { | ||||
11988 | CorrectDelayedTyposInExpr(Init, dyn_cast_or_null<VarDecl>(RealDecl)); | ||||
11989 | return; | ||||
11990 | } | ||||
11991 | |||||
11992 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { | ||||
11993 | // Pure-specifiers are handled in ActOnPureSpecifier. | ||||
11994 | Diag(Method->getLocation(), diag::err_member_function_initialization) | ||||
11995 | << Method->getDeclName() << Init->getSourceRange(); | ||||
11996 | Method->setInvalidDecl(); | ||||
11997 | return; | ||||
11998 | } | ||||
11999 | |||||
12000 | VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); | ||||
12001 | if (!VDecl) { | ||||
12002 | assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here")((!isa<FieldDecl>(RealDecl) && "field init shouldn't get here" ) ? static_cast<void> (0) : __assert_fail ("!isa<FieldDecl>(RealDecl) && \"field init shouldn't get here\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 12002, __PRETTY_FUNCTION__)); | ||||
12003 | Diag(RealDecl->getLocation(), diag::err_illegal_initializer); | ||||
12004 | RealDecl->setInvalidDecl(); | ||||
12005 | return; | ||||
12006 | } | ||||
12007 | |||||
12008 | // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. | ||||
12009 | if (VDecl->getType()->isUndeducedType()) { | ||||
12010 | // Attempt typo correction early so that the type of the init expression can | ||||
12011 | // be deduced based on the chosen correction if the original init contains a | ||||
12012 | // TypoExpr. | ||||
12013 | ExprResult Res = CorrectDelayedTyposInExpr(Init, VDecl); | ||||
12014 | if (!Res.isUsable()) { | ||||
12015 | // There are unresolved typos in Init, just drop them. | ||||
12016 | // FIXME: improve the recovery strategy to preserve the Init. | ||||
12017 | RealDecl->setInvalidDecl(); | ||||
12018 | return; | ||||
12019 | } | ||||
12020 | if (Res.get()->containsErrors()) { | ||||
12021 | // Invalidate the decl as we don't know the type for recovery-expr yet. | ||||
12022 | RealDecl->setInvalidDecl(); | ||||
12023 | VDecl->setInit(Res.get()); | ||||
12024 | return; | ||||
12025 | } | ||||
12026 | Init = Res.get(); | ||||
12027 | |||||
12028 | if (DeduceVariableDeclarationType(VDecl, DirectInit, Init)) | ||||
12029 | return; | ||||
12030 | } | ||||
12031 | |||||
12032 | // dllimport cannot be used on variable definitions. | ||||
12033 | if (VDecl->hasAttr<DLLImportAttr>() && !VDecl->isStaticDataMember()) { | ||||
12034 | Diag(VDecl->getLocation(), diag::err_attribute_dllimport_data_definition); | ||||
12035 | VDecl->setInvalidDecl(); | ||||
12036 | return; | ||||
12037 | } | ||||
12038 | |||||
12039 | if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { | ||||
12040 | // C99 6.7.8p5. C++ has no such restriction, but that is a defect. | ||||
12041 | Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); | ||||
12042 | VDecl->setInvalidDecl(); | ||||
12043 | return; | ||||
12044 | } | ||||
12045 | |||||
12046 | if (!VDecl->getType()->isDependentType()) { | ||||
12047 | // A definition must end up with a complete type, which means it must be | ||||
12048 | // complete with the restriction that an array type might be completed by | ||||
12049 | // the initializer; note that later code assumes this restriction. | ||||
12050 | QualType BaseDeclType = VDecl->getType(); | ||||
12051 | if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) | ||||
12052 | BaseDeclType = Array->getElementType(); | ||||
12053 | if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, | ||||
12054 | diag::err_typecheck_decl_incomplete_type)) { | ||||
12055 | RealDecl->setInvalidDecl(); | ||||
12056 | return; | ||||
12057 | } | ||||
12058 | |||||
12059 | // The variable can not have an abstract class type. | ||||
12060 | if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), | ||||
12061 | diag::err_abstract_type_in_decl, | ||||
12062 | AbstractVariableType)) | ||||
12063 | VDecl->setInvalidDecl(); | ||||
12064 | } | ||||
12065 | |||||
12066 | // If adding the initializer will turn this declaration into a definition, | ||||
12067 | // and we already have a definition for this variable, diagnose or otherwise | ||||
12068 | // handle the situation. | ||||
12069 | VarDecl *Def; | ||||
12070 | if ((Def = VDecl->getDefinition()) && Def != VDecl && | ||||
12071 | (!VDecl->isStaticDataMember() || VDecl->isOutOfLine()) && | ||||
12072 | !VDecl->isThisDeclarationADemotedDefinition() && | ||||
12073 | checkVarDeclRedefinition(Def, VDecl)) | ||||
12074 | return; | ||||
12075 | |||||
12076 | if (getLangOpts().CPlusPlus) { | ||||
12077 | // C++ [class.static.data]p4 | ||||
12078 | // If a static data member is of const integral or const | ||||
12079 | // enumeration type, its declaration in the class definition can | ||||
12080 | // specify a constant-initializer which shall be an integral | ||||
12081 | // constant expression (5.19). In that case, the member can appear | ||||
12082 | // in integral constant expressions. The member shall still be | ||||
12083 | // defined in a namespace scope if it is used in the program and the | ||||
12084 | // namespace scope definition shall not contain an initializer. | ||||
12085 | // | ||||
12086 | // We already performed a redefinition check above, but for static | ||||
12087 | // data members we also need to check whether there was an in-class | ||||
12088 | // declaration with an initializer. | ||||
12089 | if (VDecl->isStaticDataMember() && VDecl->getCanonicalDecl()->hasInit()) { | ||||
12090 | Diag(Init->getExprLoc(), diag::err_static_data_member_reinitialization) | ||||
12091 | << VDecl->getDeclName(); | ||||
12092 | Diag(VDecl->getCanonicalDecl()->getInit()->getExprLoc(), | ||||
12093 | diag::note_previous_initializer) | ||||
12094 | << 0; | ||||
12095 | return; | ||||
12096 | } | ||||
12097 | |||||
12098 | if (VDecl->hasLocalStorage()) | ||||
12099 | setFunctionHasBranchProtectedScope(); | ||||
12100 | |||||
12101 | if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { | ||||
12102 | VDecl->setInvalidDecl(); | ||||
12103 | return; | ||||
12104 | } | ||||
12105 | } | ||||
12106 | |||||
12107 | // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside | ||||
12108 | // a kernel function cannot be initialized." | ||||
12109 | if (VDecl->getType().getAddressSpace() == LangAS::opencl_local) { | ||||
12110 | Diag(VDecl->getLocation(), diag::err_local_cant_init); | ||||
12111 | VDecl->setInvalidDecl(); | ||||
12112 | return; | ||||
12113 | } | ||||
12114 | |||||
12115 | // The LoaderUninitialized attribute acts as a definition (of undef). | ||||
12116 | if (VDecl->hasAttr<LoaderUninitializedAttr>()) { | ||||
12117 | Diag(VDecl->getLocation(), diag::err_loader_uninitialized_cant_init); | ||||
12118 | VDecl->setInvalidDecl(); | ||||
12119 | return; | ||||
12120 | } | ||||
12121 | |||||
12122 | // Get the decls type and save a reference for later, since | ||||
12123 | // CheckInitializerTypes may change it. | ||||
12124 | QualType DclT = VDecl->getType(), SavT = DclT; | ||||
12125 | |||||
12126 | // Expressions default to 'id' when we're in a debugger | ||||
12127 | // and we are assigning it to a variable of Objective-C pointer type. | ||||
12128 | if (getLangOpts().DebuggerCastResultToId && DclT->isObjCObjectPointerType() && | ||||
12129 | Init->getType() == Context.UnknownAnyTy) { | ||||
12130 | ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); | ||||
12131 | if (Result.isInvalid()) { | ||||
12132 | VDecl->setInvalidDecl(); | ||||
12133 | return; | ||||
12134 | } | ||||
12135 | Init = Result.get(); | ||||
12136 | } | ||||
12137 | |||||
12138 | // Perform the initialization. | ||||
12139 | ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); | ||||
12140 | if (!VDecl->isInvalidDecl()) { | ||||
12141 | InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); | ||||
12142 | InitializationKind Kind = InitializationKind::CreateForInit( | ||||
12143 | VDecl->getLocation(), DirectInit, Init); | ||||
12144 | |||||
12145 | MultiExprArg Args = Init; | ||||
12146 | if (CXXDirectInit) | ||||
12147 | Args = MultiExprArg(CXXDirectInit->getExprs(), | ||||
12148 | CXXDirectInit->getNumExprs()); | ||||
12149 | |||||
12150 | // Try to correct any TypoExprs in the initialization arguments. | ||||
12151 | for (size_t Idx = 0; Idx < Args.size(); ++Idx) { | ||||
12152 | ExprResult Res = CorrectDelayedTyposInExpr( | ||||
12153 | Args[Idx], VDecl, /*RecoverUncorrectedTypos=*/true, | ||||
12154 | [this, Entity, Kind](Expr *E) { | ||||
12155 | InitializationSequence Init(*this, Entity, Kind, MultiExprArg(E)); | ||||
12156 | return Init.Failed() ? ExprError() : E; | ||||
12157 | }); | ||||
12158 | if (Res.isInvalid()) { | ||||
12159 | VDecl->setInvalidDecl(); | ||||
12160 | } else if (Res.get() != Args[Idx]) { | ||||
12161 | Args[Idx] = Res.get(); | ||||
12162 | } | ||||
12163 | } | ||||
12164 | if (VDecl->isInvalidDecl()) | ||||
12165 | return; | ||||
12166 | |||||
12167 | InitializationSequence InitSeq(*this, Entity, Kind, Args, | ||||
12168 | /*TopLevelOfInitList=*/false, | ||||
12169 | /*TreatUnavailableAsInvalid=*/false); | ||||
12170 | ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Args, &DclT); | ||||
12171 | if (Result.isInvalid()) { | ||||
12172 | // If the provied initializer fails to initialize the var decl, | ||||
12173 | // we attach a recovery expr for better recovery. | ||||
12174 | auto RecoveryExpr = | ||||
12175 | CreateRecoveryExpr(Init->getBeginLoc(), Init->getEndLoc(), Args); | ||||
12176 | if (RecoveryExpr.get()) | ||||
12177 | VDecl->setInit(RecoveryExpr.get()); | ||||
12178 | return; | ||||
12179 | } | ||||
12180 | |||||
12181 | Init = Result.getAs<Expr>(); | ||||
12182 | } | ||||
12183 | |||||
12184 | // Check for self-references within variable initializers. | ||||
12185 | // Variables declared within a function/method body (except for references) | ||||
12186 | // are handled by a dataflow analysis. | ||||
12187 | // This is undefined behavior in C++, but valid in C. | ||||
12188 | if (getLangOpts().CPlusPlus) { | ||||
12189 | if (!VDecl->hasLocalStorage() || VDecl->getType()->isRecordType() || | ||||
12190 | VDecl->getType()->isReferenceType()) { | ||||
12191 | CheckSelfReference(*this, RealDecl, Init, DirectInit); | ||||
12192 | } | ||||
12193 | } | ||||
12194 | |||||
12195 | // If the type changed, it means we had an incomplete type that was | ||||
12196 | // completed by the initializer. For example: | ||||
12197 | // int ary[] = { 1, 3, 5 }; | ||||
12198 | // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. | ||||
12199 | if (!VDecl->isInvalidDecl() && (DclT != SavT)) | ||||
12200 | VDecl->setType(DclT); | ||||
12201 | |||||
12202 | if (!VDecl->isInvalidDecl()) { | ||||
12203 | checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); | ||||
12204 | |||||
12205 | if (VDecl->hasAttr<BlocksAttr>()) | ||||
12206 | checkRetainCycles(VDecl, Init); | ||||
12207 | |||||
12208 | // It is safe to assign a weak reference into a strong variable. | ||||
12209 | // Although this code can still have problems: | ||||
12210 | // id x = self.weakProp; | ||||
12211 | // id y = self.weakProp; | ||||
12212 | // we do not warn to warn spuriously when 'x' and 'y' are on separate | ||||
12213 | // paths through the function. This should be revisited if | ||||
12214 | // -Wrepeated-use-of-weak is made flow-sensitive. | ||||
12215 | if (FunctionScopeInfo *FSI = getCurFunction()) | ||||
12216 | if ((VDecl->getType().getObjCLifetime() == Qualifiers::OCL_Strong || | ||||
12217 | VDecl->getType().isNonWeakInMRRWithObjCWeak(Context)) && | ||||
12218 | !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, | ||||
12219 | Init->getBeginLoc())) | ||||
12220 | FSI->markSafeWeakUse(Init); | ||||
12221 | } | ||||
12222 | |||||
12223 | // The initialization is usually a full-expression. | ||||
12224 | // | ||||
12225 | // FIXME: If this is a braced initialization of an aggregate, it is not | ||||
12226 | // an expression, and each individual field initializer is a separate | ||||
12227 | // full-expression. For instance, in: | ||||
12228 | // | ||||
12229 | // struct Temp { ~Temp(); }; | ||||
12230 | // struct S { S(Temp); }; | ||||
12231 | // struct T { S a, b; } t = { Temp(), Temp() } | ||||
12232 | // | ||||
12233 | // we should destroy the first Temp before constructing the second. | ||||
12234 | ExprResult Result = | ||||
12235 | ActOnFinishFullExpr(Init, VDecl->getLocation(), | ||||
12236 | /*DiscardedValue*/ false, VDecl->isConstexpr()); | ||||
12237 | if (Result.isInvalid()) { | ||||
12238 | VDecl->setInvalidDecl(); | ||||
12239 | return; | ||||
12240 | } | ||||
12241 | Init = Result.get(); | ||||
12242 | |||||
12243 | // Attach the initializer to the decl. | ||||
12244 | VDecl->setInit(Init); | ||||
12245 | |||||
12246 | if (VDecl->isLocalVarDecl()) { | ||||
12247 | // Don't check the initializer if the declaration is malformed. | ||||
12248 | if (VDecl->isInvalidDecl()) { | ||||
12249 | // do nothing | ||||
12250 | |||||
12251 | // OpenCL v1.2 s6.5.3: __constant locals must be constant-initialized. | ||||
12252 | // This is true even in C++ for OpenCL. | ||||
12253 | } else if (VDecl->getType().getAddressSpace() == LangAS::opencl_constant) { | ||||
12254 | CheckForConstantInitializer(Init, DclT); | ||||
12255 | |||||
12256 | // Otherwise, C++ does not restrict the initializer. | ||||
12257 | } else if (getLangOpts().CPlusPlus) { | ||||
12258 | // do nothing | ||||
12259 | |||||
12260 | // C99 6.7.8p4: All the expressions in an initializer for an object that has | ||||
12261 | // static storage duration shall be constant expressions or string literals. | ||||
12262 | } else if (VDecl->getStorageClass() == SC_Static) { | ||||
12263 | CheckForConstantInitializer(Init, DclT); | ||||
12264 | |||||
12265 | // C89 is stricter than C99 for aggregate initializers. | ||||
12266 | // C89 6.5.7p3: All the expressions [...] in an initializer list | ||||
12267 | // for an object that has aggregate or union type shall be | ||||
12268 | // constant expressions. | ||||
12269 | } else if (!getLangOpts().C99 && VDecl->getType()->isAggregateType() && | ||||
12270 | isa<InitListExpr>(Init)) { | ||||
12271 | const Expr *Culprit; | ||||
12272 | if (!Init->isConstantInitializer(Context, false, &Culprit)) { | ||||
12273 | Diag(Culprit->getExprLoc(), | ||||
12274 | diag::ext_aggregate_init_not_constant) | ||||
12275 | << Culprit->getSourceRange(); | ||||
12276 | } | ||||
12277 | } | ||||
12278 | |||||
12279 | if (auto *E = dyn_cast<ExprWithCleanups>(Init)) | ||||
12280 | if (auto *BE = dyn_cast<BlockExpr>(E->getSubExpr()->IgnoreParens())) | ||||
12281 | if (VDecl->hasLocalStorage()) | ||||
12282 | BE->getBlockDecl()->setCanAvoidCopyToHeap(); | ||||
12283 | } else if (VDecl->isStaticDataMember() && !VDecl->isInline() && | ||||
12284 | VDecl->getLexicalDeclContext()->isRecord()) { | ||||
12285 | // This is an in-class initialization for a static data member, e.g., | ||||
12286 | // | ||||
12287 | // struct S { | ||||
12288 | // static const int value = 17; | ||||
12289 | // }; | ||||
12290 | |||||
12291 | // C++ [class.mem]p4: | ||||
12292 | // A member-declarator can contain a constant-initializer only | ||||
12293 | // if it declares a static member (9.4) of const integral or | ||||
12294 | // const enumeration type, see 9.4.2. | ||||
12295 | // | ||||
12296 | // C++11 [class.static.data]p3: | ||||
12297 | // If a non-volatile non-inline const static data member is of integral | ||||
12298 | // or enumeration type, its declaration in the class definition can | ||||
12299 | // specify a brace-or-equal-initializer in which every initializer-clause | ||||
12300 | // that is an assignment-expression is a constant expression. A static | ||||
12301 | // data member of literal type can be declared in the class definition | ||||
12302 | // with the constexpr specifier; if so, its declaration shall specify a | ||||
12303 | // brace-or-equal-initializer in which every initializer-clause that is | ||||
12304 | // an assignment-expression is a constant expression. | ||||
12305 | |||||
12306 | // Do nothing on dependent types. | ||||
12307 | if (DclT->isDependentType()) { | ||||
12308 | |||||
12309 | // Allow any 'static constexpr' members, whether or not they are of literal | ||||
12310 | // type. We separately check that every constexpr variable is of literal | ||||
12311 | // type. | ||||
12312 | } else if (VDecl->isConstexpr()) { | ||||
12313 | |||||
12314 | // Require constness. | ||||
12315 | } else if (!DclT.isConstQualified()) { | ||||
12316 | Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) | ||||
12317 | << Init->getSourceRange(); | ||||
12318 | VDecl->setInvalidDecl(); | ||||
12319 | |||||
12320 | // We allow integer constant expressions in all cases. | ||||
12321 | } else if (DclT->isIntegralOrEnumerationType()) { | ||||
12322 | // Check whether the expression is a constant expression. | ||||
12323 | SourceLocation Loc; | ||||
12324 | if (getLangOpts().CPlusPlus11 && DclT.isVolatileQualified()) | ||||
12325 | // In C++11, a non-constexpr const static data member with an | ||||
12326 | // in-class initializer cannot be volatile. | ||||
12327 | Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); | ||||
12328 | else if (Init->isValueDependent()) | ||||
12329 | ; // Nothing to check. | ||||
12330 | else if (Init->isIntegerConstantExpr(Context, &Loc)) | ||||
12331 | ; // Ok, it's an ICE! | ||||
12332 | else if (Init->getType()->isScopedEnumeralType() && | ||||
12333 | Init->isCXX11ConstantExpr(Context)) | ||||
12334 | ; // Ok, it is a scoped-enum constant expression. | ||||
12335 | else if (Init->isEvaluatable(Context)) { | ||||
12336 | // If we can constant fold the initializer through heroics, accept it, | ||||
12337 | // but report this as a use of an extension for -pedantic. | ||||
12338 | Diag(Loc, diag::ext_in_class_initializer_non_constant) | ||||
12339 | << Init->getSourceRange(); | ||||
12340 | } else { | ||||
12341 | // Otherwise, this is some crazy unknown case. Report the issue at the | ||||
12342 | // location provided by the isIntegerConstantExpr failed check. | ||||
12343 | Diag(Loc, diag::err_in_class_initializer_non_constant) | ||||
12344 | << Init->getSourceRange(); | ||||
12345 | VDecl->setInvalidDecl(); | ||||
12346 | } | ||||
12347 | |||||
12348 | // We allow foldable floating-point constants as an extension. | ||||
12349 | } else if (DclT->isFloatingType()) { // also permits complex, which is ok | ||||
12350 | // In C++98, this is a GNU extension. In C++11, it is not, but we support | ||||
12351 | // it anyway and provide a fixit to add the 'constexpr'. | ||||
12352 | if (getLangOpts().CPlusPlus11) { | ||||
12353 | Diag(VDecl->getLocation(), | ||||
12354 | diag::ext_in_class_initializer_float_type_cxx11) | ||||
12355 | << DclT << Init->getSourceRange(); | ||||
12356 | Diag(VDecl->getBeginLoc(), | ||||
12357 | diag::note_in_class_initializer_float_type_cxx11) | ||||
12358 | << FixItHint::CreateInsertion(VDecl->getBeginLoc(), "constexpr "); | ||||
12359 | } else { | ||||
12360 | Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) | ||||
12361 | << DclT << Init->getSourceRange(); | ||||
12362 | |||||
12363 | if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { | ||||
12364 | Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) | ||||
12365 | << Init->getSourceRange(); | ||||
12366 | VDecl->setInvalidDecl(); | ||||
12367 | } | ||||
12368 | } | ||||
12369 | |||||
12370 | // Suggest adding 'constexpr' in C++11 for literal types. | ||||
12371 | } else if (getLangOpts().CPlusPlus11 && DclT->isLiteralType(Context)) { | ||||
12372 | Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) | ||||
12373 | << DclT << Init->getSourceRange() | ||||
12374 | << FixItHint::CreateInsertion(VDecl->getBeginLoc(), "constexpr "); | ||||
12375 | VDecl->setConstexpr(true); | ||||
12376 | |||||
12377 | } else { | ||||
12378 | Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) | ||||
12379 | << DclT << Init->getSourceRange(); | ||||
12380 | VDecl->setInvalidDecl(); | ||||
12381 | } | ||||
12382 | } else if (VDecl->isFileVarDecl()) { | ||||
12383 | // In C, extern is typically used to avoid tentative definitions when | ||||
12384 | // declaring variables in headers, but adding an intializer makes it a | ||||
12385 | // definition. This is somewhat confusing, so GCC and Clang both warn on it. | ||||
12386 | // In C++, extern is often used to give implictly static const variables | ||||
12387 | // external linkage, so don't warn in that case. If selectany is present, | ||||
12388 | // this might be header code intended for C and C++ inclusion, so apply the | ||||
12389 | // C++ rules. | ||||
12390 | if (VDecl->getStorageClass() == SC_Extern && | ||||
12391 | ((!getLangOpts().CPlusPlus && !VDecl->hasAttr<SelectAnyAttr>()) || | ||||
12392 | !Context.getBaseElementType(VDecl->getType()).isConstQualified()) && | ||||
12393 | !(getLangOpts().CPlusPlus && VDecl->isExternC()) && | ||||
12394 | !isTemplateInstantiation(VDecl->getTemplateSpecializationKind())) | ||||
12395 | Diag(VDecl->getLocation(), diag::warn_extern_init); | ||||
12396 | |||||
12397 | // In Microsoft C++ mode, a const variable defined in namespace scope has | ||||
12398 | // external linkage by default if the variable is declared with | ||||
12399 | // __declspec(dllexport). | ||||
12400 | if (Context.getTargetInfo().getCXXABI().isMicrosoft() && | ||||
12401 | getLangOpts().CPlusPlus && VDecl->getType().isConstQualified() && | ||||
12402 | VDecl->hasAttr<DLLExportAttr>() && VDecl->getDefinition()) | ||||
12403 | VDecl->setStorageClass(SC_Extern); | ||||
12404 | |||||
12405 | // C99 6.7.8p4. All file scoped initializers need to be constant. | ||||
12406 | if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) | ||||
12407 | CheckForConstantInitializer(Init, DclT); | ||||
12408 | } | ||||
12409 | |||||
12410 | QualType InitType = Init->getType(); | ||||
12411 | if (!InitType.isNull() && | ||||
12412 | (InitType.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || | ||||
12413 | InitType.hasNonTrivialToPrimitiveCopyCUnion())) | ||||
12414 | checkNonTrivialCUnionInInitializer(Init, Init->getExprLoc()); | ||||
12415 | |||||
12416 | // We will represent direct-initialization similarly to copy-initialization: | ||||
12417 | // int x(1); -as-> int x = 1; | ||||
12418 | // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); | ||||
12419 | // | ||||
12420 | // Clients that want to distinguish between the two forms, can check for | ||||
12421 | // direct initializer using VarDecl::getInitStyle(). | ||||
12422 | // A major benefit is that clients that don't particularly care about which | ||||
12423 | // exactly form was it (like the CodeGen) can handle both cases without | ||||
12424 | // special case code. | ||||
12425 | |||||
12426 | // C++ 8.5p11: | ||||
12427 | // The form of initialization (using parentheses or '=') is generally | ||||
12428 | // insignificant, but does matter when the entity being initialized has a | ||||
12429 | // class type. | ||||
12430 | if (CXXDirectInit) { | ||||
12431 | assert(DirectInit && "Call-style initializer must be direct init.")((DirectInit && "Call-style initializer must be direct init." ) ? static_cast<void> (0) : __assert_fail ("DirectInit && \"Call-style initializer must be direct init.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 12431, __PRETTY_FUNCTION__)); | ||||
12432 | VDecl->setInitStyle(VarDecl::CallInit); | ||||
12433 | } else if (DirectInit) { | ||||
12434 | // This must be list-initialization. No other way is direct-initialization. | ||||
12435 | VDecl->setInitStyle(VarDecl::ListInit); | ||||
12436 | } | ||||
12437 | |||||
12438 | if (LangOpts.OpenMP && VDecl->isFileVarDecl()) | ||||
12439 | DeclsToCheckForDeferredDiags.push_back(VDecl); | ||||
12440 | CheckCompleteVariableDeclaration(VDecl); | ||||
12441 | } | ||||
12442 | |||||
12443 | /// ActOnInitializerError - Given that there was an error parsing an | ||||
12444 | /// initializer for the given declaration, try to return to some form | ||||
12445 | /// of sanity. | ||||
12446 | void Sema::ActOnInitializerError(Decl *D) { | ||||
12447 | // Our main concern here is re-establishing invariants like "a | ||||
12448 | // variable's type is either dependent or complete". | ||||
12449 | if (!D || D->isInvalidDecl()) return; | ||||
12450 | |||||
12451 | VarDecl *VD = dyn_cast<VarDecl>(D); | ||||
12452 | if (!VD) return; | ||||
12453 | |||||
12454 | // Bindings are not usable if we can't make sense of the initializer. | ||||
12455 | if (auto *DD = dyn_cast<DecompositionDecl>(D)) | ||||
12456 | for (auto *BD : DD->bindings()) | ||||
12457 | BD->setInvalidDecl(); | ||||
12458 | |||||
12459 | // Auto types are meaningless if we can't make sense of the initializer. | ||||
12460 | if (VD->getType()->isUndeducedType()) { | ||||
12461 | D->setInvalidDecl(); | ||||
12462 | return; | ||||
12463 | } | ||||
12464 | |||||
12465 | QualType Ty = VD->getType(); | ||||
12466 | if (Ty->isDependentType()) return; | ||||
12467 | |||||
12468 | // Require a complete type. | ||||
12469 | if (RequireCompleteType(VD->getLocation(), | ||||
12470 | Context.getBaseElementType(Ty), | ||||
12471 | diag::err_typecheck_decl_incomplete_type)) { | ||||
12472 | VD->setInvalidDecl(); | ||||
12473 | return; | ||||
12474 | } | ||||
12475 | |||||
12476 | // Require a non-abstract type. | ||||
12477 | if (RequireNonAbstractType(VD->getLocation(), Ty, | ||||
12478 | diag::err_abstract_type_in_decl, | ||||
12479 | AbstractVariableType)) { | ||||
12480 | VD->setInvalidDecl(); | ||||
12481 | return; | ||||
12482 | } | ||||
12483 | |||||
12484 | // Don't bother complaining about constructors or destructors, | ||||
12485 | // though. | ||||
12486 | } | ||||
12487 | |||||
12488 | void Sema::ActOnUninitializedDecl(Decl *RealDecl) { | ||||
12489 | // If there is no declaration, there was an error parsing it. Just ignore it. | ||||
12490 | if (!RealDecl) | ||||
12491 | return; | ||||
12492 | |||||
12493 | if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { | ||||
12494 | QualType Type = Var->getType(); | ||||
12495 | |||||
12496 | // C++1z [dcl.dcl]p1 grammar implies that an initializer is mandatory. | ||||
12497 | if (isa<DecompositionDecl>(RealDecl)) { | ||||
12498 | Diag(Var->getLocation(), diag::err_decomp_decl_requires_init) << Var; | ||||
12499 | Var->setInvalidDecl(); | ||||
12500 | return; | ||||
12501 | } | ||||
12502 | |||||
12503 | if (Type->isUndeducedType() && | ||||
12504 | DeduceVariableDeclarationType(Var, false, nullptr)) | ||||
12505 | return; | ||||
12506 | |||||
12507 | // C++11 [class.static.data]p3: A static data member can be declared with | ||||
12508 | // the constexpr specifier; if so, its declaration shall specify | ||||
12509 | // a brace-or-equal-initializer. | ||||
12510 | // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to | ||||
12511 | // the definition of a variable [...] or the declaration of a static data | ||||
12512 | // member. | ||||
12513 | if (Var->isConstexpr() && !Var->isThisDeclarationADefinition() && | ||||
12514 | !Var->isThisDeclarationADemotedDefinition()) { | ||||
12515 | if (Var->isStaticDataMember()) { | ||||
12516 | // C++1z removes the relevant rule; the in-class declaration is always | ||||
12517 | // a definition there. | ||||
12518 | if (!getLangOpts().CPlusPlus17 && | ||||
12519 | !Context.getTargetInfo().getCXXABI().isMicrosoft()) { | ||||
12520 | Diag(Var->getLocation(), | ||||
12521 | diag::err_constexpr_static_mem_var_requires_init) | ||||
12522 | << Var; | ||||
12523 | Var->setInvalidDecl(); | ||||
12524 | return; | ||||
12525 | } | ||||
12526 | } else { | ||||
12527 | Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); | ||||
12528 | Var->setInvalidDecl(); | ||||
12529 | return; | ||||
12530 | } | ||||
12531 | } | ||||
12532 | |||||
12533 | // OpenCL v1.1 s6.5.3: variables declared in the constant address space must | ||||
12534 | // be initialized. | ||||
12535 | if (!Var->isInvalidDecl() && | ||||
12536 | Var->getType().getAddressSpace() == LangAS::opencl_constant && | ||||
12537 | Var->getStorageClass() != SC_Extern && !Var->getInit()) { | ||||
12538 | Diag(Var->getLocation(), diag::err_opencl_constant_no_init); | ||||
12539 | Var->setInvalidDecl(); | ||||
12540 | return; | ||||
12541 | } | ||||
12542 | |||||
12543 | if (!Var->isInvalidDecl() && RealDecl->hasAttr<LoaderUninitializedAttr>()) { | ||||
12544 | if (Var->getStorageClass() == SC_Extern) { | ||||
12545 | Diag(Var->getLocation(), diag::err_loader_uninitialized_extern_decl) | ||||
12546 | << Var; | ||||
12547 | Var->setInvalidDecl(); | ||||
12548 | return; | ||||
12549 | } | ||||
12550 | if (RequireCompleteType(Var->getLocation(), Var->getType(), | ||||
12551 | diag::err_typecheck_decl_incomplete_type)) { | ||||
12552 | Var->setInvalidDecl(); | ||||
12553 | return; | ||||
12554 | } | ||||
12555 | if (CXXRecordDecl *RD = Var->getType()->getAsCXXRecordDecl()) { | ||||
12556 | if (!RD->hasTrivialDefaultConstructor()) { | ||||
12557 | Diag(Var->getLocation(), diag::err_loader_uninitialized_trivial_ctor); | ||||
12558 | Var->setInvalidDecl(); | ||||
12559 | return; | ||||
12560 | } | ||||
12561 | } | ||||
12562 | } | ||||
12563 | |||||
12564 | VarDecl::DefinitionKind DefKind = Var->isThisDeclarationADefinition(); | ||||
12565 | if (!Var->isInvalidDecl() && DefKind != VarDecl::DeclarationOnly && | ||||
12566 | Var->getType().hasNonTrivialToPrimitiveDefaultInitializeCUnion()) | ||||
12567 | checkNonTrivialCUnion(Var->getType(), Var->getLocation(), | ||||
12568 | NTCUC_DefaultInitializedObject, NTCUK_Init); | ||||
12569 | |||||
12570 | |||||
12571 | switch (DefKind) { | ||||
12572 | case VarDecl::Definition: | ||||
12573 | if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) | ||||
12574 | break; | ||||
12575 | |||||
12576 | // We have an out-of-line definition of a static data member | ||||
12577 | // that has an in-class initializer, so we type-check this like | ||||
12578 | // a declaration. | ||||
12579 | // | ||||
12580 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||
12581 | |||||
12582 | case VarDecl::DeclarationOnly: | ||||
12583 | // It's only a declaration. | ||||
12584 | |||||
12585 | // Block scope. C99 6.7p7: If an identifier for an object is | ||||
12586 | // declared with no linkage (C99 6.2.2p6), the type for the | ||||
12587 | // object shall be complete. | ||||
12588 | if (!Type->isDependentType() && Var->isLocalVarDecl() && | ||||
12589 | !Var->hasLinkage() && !Var->isInvalidDecl() && | ||||
12590 | RequireCompleteType(Var->getLocation(), Type, | ||||
12591 | diag::err_typecheck_decl_incomplete_type)) | ||||
12592 | Var->setInvalidDecl(); | ||||
12593 | |||||
12594 | // Make sure that the type is not abstract. | ||||
12595 | if (!Type->isDependentType() && !Var->isInvalidDecl() && | ||||
12596 | RequireNonAbstractType(Var->getLocation(), Type, | ||||
12597 | diag::err_abstract_type_in_decl, | ||||
12598 | AbstractVariableType)) | ||||
12599 | Var->setInvalidDecl(); | ||||
12600 | if (!Type->isDependentType() && !Var->isInvalidDecl() && | ||||
12601 | Var->getStorageClass() == SC_PrivateExtern) { | ||||
12602 | Diag(Var->getLocation(), diag::warn_private_extern); | ||||
12603 | Diag(Var->getLocation(), diag::note_private_extern); | ||||
12604 | } | ||||
12605 | |||||
12606 | if (Context.getTargetInfo().allowDebugInfoForExternalVar() && | ||||
12607 | !Var->isInvalidDecl() && !getLangOpts().CPlusPlus) | ||||
12608 | ExternalDeclarations.push_back(Var); | ||||
12609 | |||||
12610 | return; | ||||
12611 | |||||
12612 | case VarDecl::TentativeDefinition: | ||||
12613 | // File scope. C99 6.9.2p2: A declaration of an identifier for an | ||||
12614 | // object that has file scope without an initializer, and without a | ||||
12615 | // storage-class specifier or with the storage-class specifier "static", | ||||
12616 | // constitutes a tentative definition. Note: A tentative definition with | ||||
12617 | // external linkage is valid (C99 6.2.2p5). | ||||
12618 | if (!Var->isInvalidDecl()) { | ||||
12619 | if (const IncompleteArrayType *ArrayT | ||||
12620 | = Context.getAsIncompleteArrayType(Type)) { | ||||
12621 | if (RequireCompleteSizedType( | ||||
12622 | Var->getLocation(), ArrayT->getElementType(), | ||||
12623 | diag::err_array_incomplete_or_sizeless_type)) | ||||
12624 | Var->setInvalidDecl(); | ||||
12625 | } else if (Var->getStorageClass() == SC_Static) { | ||||
12626 | // C99 6.9.2p3: If the declaration of an identifier for an object is | ||||
12627 | // a tentative definition and has internal linkage (C99 6.2.2p3), the | ||||
12628 | // declared type shall not be an incomplete type. | ||||
12629 | // NOTE: code such as the following | ||||
12630 | // static struct s; | ||||
12631 | // struct s { int a; }; | ||||
12632 | // is accepted by gcc. Hence here we issue a warning instead of | ||||
12633 | // an error and we do not invalidate the static declaration. | ||||
12634 | // NOTE: to avoid multiple warnings, only check the first declaration. | ||||
12635 | if (Var->isFirstDecl()) | ||||
12636 | RequireCompleteType(Var->getLocation(), Type, | ||||
12637 | diag::ext_typecheck_decl_incomplete_type); | ||||
12638 | } | ||||
12639 | } | ||||
12640 | |||||
12641 | // Record the tentative definition; we're done. | ||||
12642 | if (!Var->isInvalidDecl()) | ||||
12643 | TentativeDefinitions.push_back(Var); | ||||
12644 | return; | ||||
12645 | } | ||||
12646 | |||||
12647 | // Provide a specific diagnostic for uninitialized variable | ||||
12648 | // definitions with incomplete array type. | ||||
12649 | if (Type->isIncompleteArrayType()) { | ||||
12650 | Diag(Var->getLocation(), | ||||
12651 | diag::err_typecheck_incomplete_array_needs_initializer); | ||||
12652 | Var->setInvalidDecl(); | ||||
12653 | return; | ||||
12654 | } | ||||
12655 | |||||
12656 | // Provide a specific diagnostic for uninitialized variable | ||||
12657 | // definitions with reference type. | ||||
12658 | if (Type->isReferenceType()) { | ||||
12659 | Diag(Var->getLocation(), diag::err_reference_var_requires_init) | ||||
12660 | << Var << SourceRange(Var->getLocation(), Var->getLocation()); | ||||
12661 | Var->setInvalidDecl(); | ||||
12662 | return; | ||||
12663 | } | ||||
12664 | |||||
12665 | // Do not attempt to type-check the default initializer for a | ||||
12666 | // variable with dependent type. | ||||
12667 | if (Type->isDependentType()) | ||||
12668 | return; | ||||
12669 | |||||
12670 | if (Var->isInvalidDecl()) | ||||
12671 | return; | ||||
12672 | |||||
12673 | if (!Var->hasAttr<AliasAttr>()) { | ||||
12674 | if (RequireCompleteType(Var->getLocation(), | ||||
12675 | Context.getBaseElementType(Type), | ||||
12676 | diag::err_typecheck_decl_incomplete_type)) { | ||||
12677 | Var->setInvalidDecl(); | ||||
12678 | return; | ||||
12679 | } | ||||
12680 | } else { | ||||
12681 | return; | ||||
12682 | } | ||||
12683 | |||||
12684 | // The variable can not have an abstract class type. | ||||
12685 | if (RequireNonAbstractType(Var->getLocation(), Type, | ||||
12686 | diag::err_abstract_type_in_decl, | ||||
12687 | AbstractVariableType)) { | ||||
12688 | Var->setInvalidDecl(); | ||||
12689 | return; | ||||
12690 | } | ||||
12691 | |||||
12692 | // Check for jumps past the implicit initializer. C++0x | ||||
12693 | // clarifies that this applies to a "variable with automatic | ||||
12694 | // storage duration", not a "local variable". | ||||
12695 | // C++11 [stmt.dcl]p3 | ||||
12696 | // A program that jumps from a point where a variable with automatic | ||||
12697 | // storage duration is not in scope to a point where it is in scope is | ||||
12698 | // ill-formed unless the variable has scalar type, class type with a | ||||
12699 | // trivial default constructor and a trivial destructor, a cv-qualified | ||||
12700 | // version of one of these types, or an array of one of the preceding | ||||
12701 | // types and is declared without an initializer. | ||||
12702 | if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) { | ||||
12703 | if (const RecordType *Record | ||||
12704 | = Context.getBaseElementType(Type)->getAs<RecordType>()) { | ||||
12705 | CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); | ||||
12706 | // Mark the function (if we're in one) for further checking even if the | ||||
12707 | // looser rules of C++11 do not require such checks, so that we can | ||||
12708 | // diagnose incompatibilities with C++98. | ||||
12709 | if (!CXXRecord->isPOD()) | ||||
12710 | setFunctionHasBranchProtectedScope(); | ||||
12711 | } | ||||
12712 | } | ||||
12713 | // In OpenCL, we can't initialize objects in the __local address space, | ||||
12714 | // even implicitly, so don't synthesize an implicit initializer. | ||||
12715 | if (getLangOpts().OpenCL && | ||||
12716 | Var->getType().getAddressSpace() == LangAS::opencl_local) | ||||
12717 | return; | ||||
12718 | // C++03 [dcl.init]p9: | ||||
12719 | // If no initializer is specified for an object, and the | ||||
12720 | // object is of (possibly cv-qualified) non-POD class type (or | ||||
12721 | // array thereof), the object shall be default-initialized; if | ||||
12722 | // the object is of const-qualified type, the underlying class | ||||
12723 | // type shall have a user-declared default | ||||
12724 | // constructor. Otherwise, if no initializer is specified for | ||||
12725 | // a non- static object, the object and its subobjects, if | ||||
12726 | // any, have an indeterminate initial value); if the object | ||||
12727 | // or any of its subobjects are of const-qualified type, the | ||||
12728 | // program is ill-formed. | ||||
12729 | // C++0x [dcl.init]p11: | ||||
12730 | // If no initializer is specified for an object, the object is | ||||
12731 | // default-initialized; [...]. | ||||
12732 | InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); | ||||
12733 | InitializationKind Kind | ||||
12734 | = InitializationKind::CreateDefault(Var->getLocation()); | ||||
12735 | |||||
12736 | InitializationSequence InitSeq(*this, Entity, Kind, None); | ||||
12737 | ExprResult Init = InitSeq.Perform(*this, Entity, Kind, None); | ||||
12738 | |||||
12739 | if (Init.get()) { | ||||
12740 | Var->setInit(MaybeCreateExprWithCleanups(Init.get())); | ||||
12741 | // This is important for template substitution. | ||||
12742 | Var->setInitStyle(VarDecl::CallInit); | ||||
12743 | } else if (Init.isInvalid()) { | ||||
12744 | // If default-init fails, attach a recovery-expr initializer to track | ||||
12745 | // that initialization was attempted and failed. | ||||
12746 | auto RecoveryExpr = | ||||
12747 | CreateRecoveryExpr(Var->getLocation(), Var->getLocation(), {}); | ||||
12748 | if (RecoveryExpr.get()) | ||||
12749 | Var->setInit(RecoveryExpr.get()); | ||||
12750 | } | ||||
12751 | |||||
12752 | CheckCompleteVariableDeclaration(Var); | ||||
12753 | } | ||||
12754 | } | ||||
12755 | |||||
12756 | void Sema::ActOnCXXForRangeDecl(Decl *D) { | ||||
12757 | // If there is no declaration, there was an error parsing it. Ignore it. | ||||
12758 | if (!D) | ||||
12759 | return; | ||||
12760 | |||||
12761 | VarDecl *VD = dyn_cast<VarDecl>(D); | ||||
12762 | if (!VD) { | ||||
12763 | Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); | ||||
12764 | D->setInvalidDecl(); | ||||
12765 | return; | ||||
12766 | } | ||||
12767 | |||||
12768 | VD->setCXXForRangeDecl(true); | ||||
12769 | |||||
12770 | // for-range-declaration cannot be given a storage class specifier. | ||||
12771 | int Error = -1; | ||||
12772 | switch (VD->getStorageClass()) { | ||||
12773 | case SC_None: | ||||
12774 | break; | ||||
12775 | case SC_Extern: | ||||
12776 | Error = 0; | ||||
12777 | break; | ||||
12778 | case SC_Static: | ||||
12779 | Error = 1; | ||||
12780 | break; | ||||
12781 | case SC_PrivateExtern: | ||||
12782 | Error = 2; | ||||
12783 | break; | ||||
12784 | case SC_Auto: | ||||
12785 | Error = 3; | ||||
12786 | break; | ||||
12787 | case SC_Register: | ||||
12788 | Error = 4; | ||||
12789 | break; | ||||
12790 | } | ||||
12791 | |||||
12792 | // for-range-declaration cannot be given a storage class specifier con't. | ||||
12793 | switch (VD->getTSCSpec()) { | ||||
12794 | case TSCS_thread_local: | ||||
12795 | Error = 6; | ||||
12796 | break; | ||||
12797 | case TSCS___thread: | ||||
12798 | case TSCS__Thread_local: | ||||
12799 | case TSCS_unspecified: | ||||
12800 | break; | ||||
12801 | } | ||||
12802 | |||||
12803 | if (Error != -1) { | ||||
12804 | Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) | ||||
12805 | << VD << Error; | ||||
12806 | D->setInvalidDecl(); | ||||
12807 | } | ||||
12808 | } | ||||
12809 | |||||
12810 | StmtResult | ||||
12811 | Sema::ActOnCXXForRangeIdentifier(Scope *S, SourceLocation IdentLoc, | ||||
12812 | IdentifierInfo *Ident, | ||||
12813 | ParsedAttributes &Attrs, | ||||
12814 | SourceLocation AttrEnd) { | ||||
12815 | // C++1y [stmt.iter]p1: | ||||
12816 | // A range-based for statement of the form | ||||
12817 | // for ( for-range-identifier : for-range-initializer ) statement | ||||
12818 | // is equivalent to | ||||
12819 | // for ( auto&& for-range-identifier : for-range-initializer ) statement | ||||
12820 | DeclSpec DS(Attrs.getPool().getFactory()); | ||||
12821 | |||||
12822 | const char *PrevSpec; | ||||
12823 | unsigned DiagID; | ||||
12824 | DS.SetTypeSpecType(DeclSpec::TST_auto, IdentLoc, PrevSpec, DiagID, | ||||
12825 | getPrintingPolicy()); | ||||
12826 | |||||
12827 | Declarator D(DS, DeclaratorContext::ForInit); | ||||
12828 | D.SetIdentifier(Ident, IdentLoc); | ||||
12829 | D.takeAttributes(Attrs, AttrEnd); | ||||
12830 | |||||
12831 | D.AddTypeInfo(DeclaratorChunk::getReference(0, IdentLoc, /*lvalue*/ false), | ||||
12832 | IdentLoc); | ||||
12833 | Decl *Var = ActOnDeclarator(S, D); | ||||
12834 | cast<VarDecl>(Var)->setCXXForRangeDecl(true); | ||||
12835 | FinalizeDeclaration(Var); | ||||
12836 | return ActOnDeclStmt(FinalizeDeclaratorGroup(S, DS, Var), IdentLoc, | ||||
12837 | AttrEnd.isValid() ? AttrEnd : IdentLoc); | ||||
12838 | } | ||||
12839 | |||||
12840 | void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { | ||||
12841 | if (var->isInvalidDecl()) return; | ||||
12842 | |||||
12843 | if (getLangOpts().OpenCL) { | ||||
12844 | // OpenCL v2.0 s6.12.5 - Every block variable declaration must have an | ||||
12845 | // initialiser | ||||
12846 | if (var->getTypeSourceInfo()->getType()->isBlockPointerType() && | ||||
12847 | !var->hasInit()) { | ||||
12848 | Diag(var->getLocation(), diag::err_opencl_invalid_block_declaration) | ||||
12849 | << 1 /*Init*/; | ||||
12850 | var->setInvalidDecl(); | ||||
12851 | return; | ||||
12852 | } | ||||
12853 | } | ||||
12854 | |||||
12855 | // In Objective-C, don't allow jumps past the implicit initialization of a | ||||
12856 | // local retaining variable. | ||||
12857 | if (getLangOpts().ObjC && | ||||
12858 | var->hasLocalStorage()) { | ||||
12859 | switch (var->getType().getObjCLifetime()) { | ||||
12860 | case Qualifiers::OCL_None: | ||||
12861 | case Qualifiers::OCL_ExplicitNone: | ||||
12862 | case Qualifiers::OCL_Autoreleasing: | ||||
12863 | break; | ||||
12864 | |||||
12865 | case Qualifiers::OCL_Weak: | ||||
12866 | case Qualifiers::OCL_Strong: | ||||
12867 | setFunctionHasBranchProtectedScope(); | ||||
12868 | break; | ||||
12869 | } | ||||
12870 | } | ||||
12871 | |||||
12872 | if (var->hasLocalStorage() && | ||||
12873 | var->getType().isDestructedType() == QualType::DK_nontrivial_c_struct) | ||||
12874 | setFunctionHasBranchProtectedScope(); | ||||
12875 | |||||
12876 | // Warn about externally-visible variables being defined without a | ||||
12877 | // prior declaration. We only want to do this for global | ||||
12878 | // declarations, but we also specifically need to avoid doing it for | ||||
12879 | // class members because the linkage of an anonymous class can | ||||
12880 | // change if it's later given a typedef name. | ||||
12881 | if (var->isThisDeclarationADefinition() && | ||||
12882 | var->getDeclContext()->getRedeclContext()->isFileContext() && | ||||
12883 | var->isExternallyVisible() && var->hasLinkage() && | ||||
12884 | !var->isInline() && !var->getDescribedVarTemplate() && | ||||
12885 | !isa<VarTemplatePartialSpecializationDecl>(var) && | ||||
12886 | !isTemplateInstantiation(var->getTemplateSpecializationKind()) && | ||||
12887 | !getDiagnostics().isIgnored(diag::warn_missing_variable_declarations, | ||||
12888 | var->getLocation())) { | ||||
12889 | // Find a previous declaration that's not a definition. | ||||
12890 | VarDecl *prev = var->getPreviousDecl(); | ||||
12891 | while (prev && prev->isThisDeclarationADefinition()) | ||||
12892 | prev = prev->getPreviousDecl(); | ||||
12893 | |||||
12894 | if (!prev) { | ||||
12895 | Diag(var->getLocation(), diag::warn_missing_variable_declarations) << var; | ||||
12896 | Diag(var->getTypeSpecStartLoc(), diag::note_static_for_internal_linkage) | ||||
12897 | << /* variable */ 0; | ||||
12898 | } | ||||
12899 | } | ||||
12900 | |||||
12901 | // Cache the result of checking for constant initialization. | ||||
12902 | Optional<bool> CacheHasConstInit; | ||||
12903 | const Expr *CacheCulprit = nullptr; | ||||
12904 | auto checkConstInit = [&]() mutable { | ||||
12905 | if (!CacheHasConstInit) | ||||
12906 | CacheHasConstInit = var->getInit()->isConstantInitializer( | ||||
12907 | Context, var->getType()->isReferenceType(), &CacheCulprit); | ||||
12908 | return *CacheHasConstInit; | ||||
12909 | }; | ||||
12910 | |||||
12911 | if (var->getTLSKind() == VarDecl::TLS_Static) { | ||||
12912 | if (var->getType().isDestructedType()) { | ||||
12913 | // GNU C++98 edits for __thread, [basic.start.term]p3: | ||||
12914 | // The type of an object with thread storage duration shall not | ||||
12915 | // have a non-trivial destructor. | ||||
12916 | Diag(var->getLocation(), diag::err_thread_nontrivial_dtor); | ||||
12917 | if (getLangOpts().CPlusPlus11) | ||||
12918 | Diag(var->getLocation(), diag::note_use_thread_local); | ||||
12919 | } else if (getLangOpts().CPlusPlus && var->hasInit()) { | ||||
12920 | if (!checkConstInit()) { | ||||
12921 | // GNU C++98 edits for __thread, [basic.start.init]p4: | ||||
12922 | // An object of thread storage duration shall not require dynamic | ||||
12923 | // initialization. | ||||
12924 | // FIXME: Need strict checking here. | ||||
12925 | Diag(CacheCulprit->getExprLoc(), diag::err_thread_dynamic_init) | ||||
12926 | << CacheCulprit->getSourceRange(); | ||||
12927 | if (getLangOpts().CPlusPlus11) | ||||
12928 | Diag(var->getLocation(), diag::note_use_thread_local); | ||||
12929 | } | ||||
12930 | } | ||||
12931 | } | ||||
12932 | |||||
12933 | // Apply section attributes and pragmas to global variables. | ||||
12934 | bool GlobalStorage = var->hasGlobalStorage(); | ||||
12935 | if (GlobalStorage && var->isThisDeclarationADefinition() && | ||||
12936 | !inTemplateInstantiation()) { | ||||
12937 | PragmaStack<StringLiteral *> *Stack = nullptr; | ||||
12938 | int SectionFlags = ASTContext::PSF_Read; | ||||
12939 | if (var->getType().isConstQualified()) | ||||
12940 | Stack = &ConstSegStack; | ||||
12941 | else if (!var->getInit()) { | ||||
12942 | Stack = &BSSSegStack; | ||||
12943 | SectionFlags |= ASTContext::PSF_Write; | ||||
12944 | } else { | ||||
12945 | Stack = &DataSegStack; | ||||
12946 | SectionFlags |= ASTContext::PSF_Write; | ||||
12947 | } | ||||
12948 | if (const SectionAttr *SA = var->getAttr<SectionAttr>()) { | ||||
12949 | if (SA->getSyntax() == AttributeCommonInfo::AS_Declspec) | ||||
12950 | SectionFlags |= ASTContext::PSF_Implicit; | ||||
12951 | UnifySection(SA->getName(), SectionFlags, var); | ||||
12952 | } else if (Stack->CurrentValue) { | ||||
12953 | SectionFlags |= ASTContext::PSF_Implicit; | ||||
12954 | auto SectionName = Stack->CurrentValue->getString(); | ||||
12955 | var->addAttr(SectionAttr::CreateImplicit( | ||||
12956 | Context, SectionName, Stack->CurrentPragmaLocation, | ||||
12957 | AttributeCommonInfo::AS_Pragma, SectionAttr::Declspec_allocate)); | ||||
12958 | if (UnifySection(SectionName, SectionFlags, var)) | ||||
12959 | var->dropAttr<SectionAttr>(); | ||||
12960 | } | ||||
12961 | |||||
12962 | // Apply the init_seg attribute if this has an initializer. If the | ||||
12963 | // initializer turns out to not be dynamic, we'll end up ignoring this | ||||
12964 | // attribute. | ||||
12965 | if (CurInitSeg && var->getInit()) | ||||
12966 | var->addAttr(InitSegAttr::CreateImplicit(Context, CurInitSeg->getString(), | ||||
12967 | CurInitSegLoc, | ||||
12968 | AttributeCommonInfo::AS_Pragma)); | ||||
12969 | } | ||||
12970 | |||||
12971 | if (!var->getType()->isStructureType() && var->hasInit() && | ||||
12972 | isa<InitListExpr>(var->getInit())) { | ||||
12973 | const auto *ILE = cast<InitListExpr>(var->getInit()); | ||||
12974 | unsigned NumInits = ILE->getNumInits(); | ||||
12975 | if (NumInits > 2) | ||||
12976 | for (unsigned I = 0; I < NumInits; ++I) { | ||||
12977 | const auto *Init = ILE->getInit(I); | ||||
12978 | if (!Init) | ||||
12979 | break; | ||||
12980 | const auto *SL = dyn_cast<StringLiteral>(Init->IgnoreImpCasts()); | ||||
12981 | if (!SL) | ||||
12982 | break; | ||||
12983 | |||||
12984 | unsigned NumConcat = SL->getNumConcatenated(); | ||||
12985 | // Diagnose missing comma in string array initialization. | ||||
12986 | // Do not warn when all the elements in the initializer are concatenated | ||||
12987 | // together. Do not warn for macros too. | ||||
12988 | if (NumConcat == 2 && !SL->getBeginLoc().isMacroID()) { | ||||
12989 | bool OnlyOneMissingComma = true; | ||||
12990 | for (unsigned J = I + 1; J < NumInits; ++J) { | ||||
12991 | const auto *Init = ILE->getInit(J); | ||||
12992 | if (!Init) | ||||
12993 | break; | ||||
12994 | const auto *SLJ = dyn_cast<StringLiteral>(Init->IgnoreImpCasts()); | ||||
12995 | if (!SLJ || SLJ->getNumConcatenated() > 1) { | ||||
12996 | OnlyOneMissingComma = false; | ||||
12997 | break; | ||||
12998 | } | ||||
12999 | } | ||||
13000 | |||||
13001 | if (OnlyOneMissingComma) { | ||||
13002 | SmallVector<FixItHint, 1> Hints; | ||||
13003 | for (unsigned i = 0; i < NumConcat - 1; ++i) | ||||
13004 | Hints.push_back(FixItHint::CreateInsertion( | ||||
13005 | PP.getLocForEndOfToken(SL->getStrTokenLoc(i)), ",")); | ||||
13006 | |||||
13007 | Diag(SL->getStrTokenLoc(1), | ||||
13008 | diag::warn_concatenated_literal_array_init) | ||||
13009 | << Hints; | ||||
13010 | Diag(SL->getBeginLoc(), | ||||
13011 | diag::note_concatenated_string_literal_silence); | ||||
13012 | } | ||||
13013 | // In any case, stop now. | ||||
13014 | break; | ||||
13015 | } | ||||
13016 | } | ||||
13017 | } | ||||
13018 | |||||
13019 | // All the following checks are C++ only. | ||||
13020 | if (!getLangOpts().CPlusPlus) { | ||||
13021 | // If this variable must be emitted, add it as an initializer for the | ||||
13022 | // current module. | ||||
13023 | if (Context.DeclMustBeEmitted(var) && !ModuleScopes.empty()) | ||||
13024 | Context.addModuleInitializer(ModuleScopes.back().Module, var); | ||||
13025 | return; | ||||
13026 | } | ||||
13027 | |||||
13028 | QualType type = var->getType(); | ||||
13029 | |||||
13030 | if (var->hasAttr<BlocksAttr>()) | ||||
13031 | getCurFunction()->addByrefBlockVar(var); | ||||
13032 | |||||
13033 | Expr *Init = var->getInit(); | ||||
13034 | bool IsGlobal = GlobalStorage && !var->isStaticLocal(); | ||||
13035 | QualType baseType = Context.getBaseElementType(type); | ||||
13036 | |||||
13037 | // Check whether the initializer is sufficiently constant. | ||||
13038 | if (!type->isDependentType() && Init && !Init->isValueDependent() && | ||||
13039 | (GlobalStorage || var->isConstexpr() || | ||||
13040 | var->mightBeUsableInConstantExpressions(Context))) { | ||||
13041 | // If this variable might have a constant initializer or might be usable in | ||||
13042 | // constant expressions, check whether or not it actually is now. We can't | ||||
13043 | // do this lazily, because the result might depend on things that change | ||||
13044 | // later, such as which constexpr functions happen to be defined. | ||||
13045 | SmallVector<PartialDiagnosticAt, 8> Notes; | ||||
13046 | bool HasConstInit; | ||||
13047 | if (!getLangOpts().CPlusPlus11) { | ||||
13048 | // Prior to C++11, in contexts where a constant initializer is required, | ||||
13049 | // the set of valid constant initializers is described by syntactic rules | ||||
13050 | // in [expr.const]p2-6. | ||||
13051 | // FIXME: Stricter checking for these rules would be useful for constinit / | ||||
13052 | // -Wglobal-constructors. | ||||
13053 | HasConstInit = checkConstInit(); | ||||
13054 | |||||
13055 | // Compute and cache the constant value, and remember that we have a | ||||
13056 | // constant initializer. | ||||
13057 | if (HasConstInit) { | ||||
13058 | (void)var->checkForConstantInitialization(Notes); | ||||
13059 | Notes.clear(); | ||||
13060 | } else if (CacheCulprit) { | ||||
13061 | Notes.emplace_back(CacheCulprit->getExprLoc(), | ||||
13062 | PDiag(diag::note_invalid_subexpr_in_const_expr)); | ||||
13063 | Notes.back().second << CacheCulprit->getSourceRange(); | ||||
13064 | } | ||||
13065 | } else { | ||||
13066 | // Evaluate the initializer to see if it's a constant initializer. | ||||
13067 | HasConstInit = var->checkForConstantInitialization(Notes); | ||||
13068 | } | ||||
13069 | |||||
13070 | if (HasConstInit) { | ||||
13071 | // FIXME: Consider replacing the initializer with a ConstantExpr. | ||||
13072 | } else if (var->isConstexpr()) { | ||||
13073 | SourceLocation DiagLoc = var->getLocation(); | ||||
13074 | // If the note doesn't add any useful information other than a source | ||||
13075 | // location, fold it into the primary diagnostic. | ||||
13076 | if (Notes.size() == 1 && Notes[0].second.getDiagID() == | ||||
13077 | diag::note_invalid_subexpr_in_const_expr) { | ||||
13078 | DiagLoc = Notes[0].first; | ||||
13079 | Notes.clear(); | ||||
13080 | } | ||||
13081 | Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) | ||||
13082 | << var << Init->getSourceRange(); | ||||
13083 | for (unsigned I = 0, N = Notes.size(); I != N; ++I) | ||||
13084 | Diag(Notes[I].first, Notes[I].second); | ||||
13085 | } else if (GlobalStorage && var->hasAttr<ConstInitAttr>()) { | ||||
13086 | auto *Attr = var->getAttr<ConstInitAttr>(); | ||||
13087 | Diag(var->getLocation(), diag::err_require_constant_init_failed) | ||||
13088 | << Init->getSourceRange(); | ||||
13089 | Diag(Attr->getLocation(), diag::note_declared_required_constant_init_here) | ||||
13090 | << Attr->getRange() << Attr->isConstinit(); | ||||
13091 | for (auto &it : Notes) | ||||
13092 | Diag(it.first, it.second); | ||||
13093 | } else if (IsGlobal && | ||||
13094 | !getDiagnostics().isIgnored(diag::warn_global_constructor, | ||||
13095 | var->getLocation())) { | ||||
13096 | // Warn about globals which don't have a constant initializer. Don't | ||||
13097 | // warn about globals with a non-trivial destructor because we already | ||||
13098 | // warned about them. | ||||
13099 | CXXRecordDecl *RD = baseType->getAsCXXRecordDecl(); | ||||
13100 | if (!(RD && !RD->hasTrivialDestructor())) { | ||||
13101 | // checkConstInit() here permits trivial default initialization even in | ||||
13102 | // C++11 onwards, where such an initializer is not a constant initializer | ||||
13103 | // but nonetheless doesn't require a global constructor. | ||||
13104 | if (!checkConstInit()) | ||||
13105 | Diag(var->getLocation(), diag::warn_global_constructor) | ||||
13106 | << Init->getSourceRange(); | ||||
13107 | } | ||||
13108 | } | ||||
13109 | } | ||||
13110 | |||||
13111 | // Require the destructor. | ||||
13112 | if (!type->isDependentType()) | ||||
13113 | if (const RecordType *recordType = baseType->getAs<RecordType>()) | ||||
13114 | FinalizeVarWithDestructor(var, recordType); | ||||
13115 | |||||
13116 | // If this variable must be emitted, add it as an initializer for the current | ||||
13117 | // module. | ||||
13118 | if (Context.DeclMustBeEmitted(var) && !ModuleScopes.empty()) | ||||
13119 | Context.addModuleInitializer(ModuleScopes.back().Module, var); | ||||
13120 | |||||
13121 | // Build the bindings if this is a structured binding declaration. | ||||
13122 | if (auto *DD = dyn_cast<DecompositionDecl>(var)) | ||||
13123 | CheckCompleteDecompositionDeclaration(DD); | ||||
13124 | } | ||||
13125 | |||||
13126 | /// Determines if a variable's alignment is dependent. | ||||
13127 | static bool hasDependentAlignment(VarDecl *VD) { | ||||
13128 | if (VD->getType()->isDependentType()) | ||||
13129 | return true; | ||||
13130 | for (auto *I : VD->specific_attrs<AlignedAttr>()) | ||||
13131 | if (I->isAlignmentDependent()) | ||||
13132 | return true; | ||||
13133 | return false; | ||||
13134 | } | ||||
13135 | |||||
13136 | /// Check if VD needs to be dllexport/dllimport due to being in a | ||||
13137 | /// dllexport/import function. | ||||
13138 | void Sema::CheckStaticLocalForDllExport(VarDecl *VD) { | ||||
13139 | assert(VD->isStaticLocal())((VD->isStaticLocal()) ? static_cast<void> (0) : __assert_fail ("VD->isStaticLocal()", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 13139, __PRETTY_FUNCTION__)); | ||||
13140 | |||||
13141 | auto *FD = dyn_cast_or_null<FunctionDecl>(VD->getParentFunctionOrMethod()); | ||||
13142 | |||||
13143 | // Find outermost function when VD is in lambda function. | ||||
13144 | while (FD && !getDLLAttr(FD) && | ||||
13145 | !FD->hasAttr<DLLExportStaticLocalAttr>() && | ||||
13146 | !FD->hasAttr<DLLImportStaticLocalAttr>()) { | ||||
13147 | FD = dyn_cast_or_null<FunctionDecl>(FD->getParentFunctionOrMethod()); | ||||
13148 | } | ||||
13149 | |||||
13150 | if (!FD) | ||||
13151 | return; | ||||
13152 | |||||
13153 | // Static locals inherit dll attributes from their function. | ||||
13154 | if (Attr *A = getDLLAttr(FD)) { | ||||
13155 | auto *NewAttr = cast<InheritableAttr>(A->clone(getASTContext())); | ||||
13156 | NewAttr->setInherited(true); | ||||
13157 | VD->addAttr(NewAttr); | ||||
13158 | } else if (Attr *A = FD->getAttr<DLLExportStaticLocalAttr>()) { | ||||
13159 | auto *NewAttr = DLLExportAttr::CreateImplicit(getASTContext(), *A); | ||||
13160 | NewAttr->setInherited(true); | ||||
13161 | VD->addAttr(NewAttr); | ||||
13162 | |||||
13163 | // Export this function to enforce exporting this static variable even | ||||
13164 | // if it is not used in this compilation unit. | ||||
13165 | if (!FD->hasAttr<DLLExportAttr>()) | ||||
13166 | FD->addAttr(NewAttr); | ||||
13167 | |||||
13168 | } else if (Attr *A = FD->getAttr<DLLImportStaticLocalAttr>()) { | ||||
13169 | auto *NewAttr = DLLImportAttr::CreateImplicit(getASTContext(), *A); | ||||
13170 | NewAttr->setInherited(true); | ||||
13171 | VD->addAttr(NewAttr); | ||||
13172 | } | ||||
13173 | } | ||||
13174 | |||||
13175 | /// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform | ||||
13176 | /// any semantic actions necessary after any initializer has been attached. | ||||
13177 | void Sema::FinalizeDeclaration(Decl *ThisDecl) { | ||||
13178 | // Note that we are no longer parsing the initializer for this declaration. | ||||
13179 | ParsingInitForAutoVars.erase(ThisDecl); | ||||
13180 | |||||
13181 | VarDecl *VD = dyn_cast_or_null<VarDecl>(ThisDecl); | ||||
13182 | if (!VD) | ||||
13183 | return; | ||||
13184 | |||||
13185 | // Apply an implicit SectionAttr if '#pragma clang section bss|data|rodata' is active | ||||
13186 | if (VD->hasGlobalStorage() && VD->isThisDeclarationADefinition() && | ||||
13187 | !inTemplateInstantiation() && !VD->hasAttr<SectionAttr>()) { | ||||
13188 | if (PragmaClangBSSSection.Valid) | ||||
13189 | VD->addAttr(PragmaClangBSSSectionAttr::CreateImplicit( | ||||
13190 | Context, PragmaClangBSSSection.SectionName, | ||||
13191 | PragmaClangBSSSection.PragmaLocation, | ||||
13192 | AttributeCommonInfo::AS_Pragma)); | ||||
13193 | if (PragmaClangDataSection.Valid) | ||||
13194 | VD->addAttr(PragmaClangDataSectionAttr::CreateImplicit( | ||||
13195 | Context, PragmaClangDataSection.SectionName, | ||||
13196 | PragmaClangDataSection.PragmaLocation, | ||||
13197 | AttributeCommonInfo::AS_Pragma)); | ||||
13198 | if (PragmaClangRodataSection.Valid) | ||||
13199 | VD->addAttr(PragmaClangRodataSectionAttr::CreateImplicit( | ||||
13200 | Context, PragmaClangRodataSection.SectionName, | ||||
13201 | PragmaClangRodataSection.PragmaLocation, | ||||
13202 | AttributeCommonInfo::AS_Pragma)); | ||||
13203 | if (PragmaClangRelroSection.Valid) | ||||
13204 | VD->addAttr(PragmaClangRelroSectionAttr::CreateImplicit( | ||||
13205 | Context, PragmaClangRelroSection.SectionName, | ||||
13206 | PragmaClangRelroSection.PragmaLocation, | ||||
13207 | AttributeCommonInfo::AS_Pragma)); | ||||
13208 | } | ||||
13209 | |||||
13210 | if (auto *DD = dyn_cast<DecompositionDecl>(ThisDecl)) { | ||||
13211 | for (auto *BD : DD->bindings()) { | ||||
13212 | FinalizeDeclaration(BD); | ||||
13213 | } | ||||
13214 | } | ||||
13215 | |||||
13216 | checkAttributesAfterMerging(*this, *VD); | ||||
13217 | |||||
13218 | // Perform TLS alignment check here after attributes attached to the variable | ||||
13219 | // which may affect the alignment have been processed. Only perform the check | ||||
13220 | // if the target has a maximum TLS alignment (zero means no constraints). | ||||
13221 | if (unsigned MaxAlign = Context.getTargetInfo().getMaxTLSAlign()) { | ||||
13222 | // Protect the check so that it's not performed on dependent types and | ||||
13223 | // dependent alignments (we can't determine the alignment in that case). | ||||
13224 | if (VD->getTLSKind() && !hasDependentAlignment(VD) && | ||||
13225 | !VD->isInvalidDecl()) { | ||||
13226 | CharUnits MaxAlignChars = Context.toCharUnitsFromBits(MaxAlign); | ||||
13227 | if (Context.getDeclAlign(VD) > MaxAlignChars) { | ||||
13228 | Diag(VD->getLocation(), diag::err_tls_var_aligned_over_maximum) | ||||
13229 | << (unsigned)Context.getDeclAlign(VD).getQuantity() << VD | ||||
13230 | << (unsigned)MaxAlignChars.getQuantity(); | ||||
13231 | } | ||||
13232 | } | ||||
13233 | } | ||||
13234 | |||||
13235 | if (VD->isStaticLocal()) | ||||
13236 | CheckStaticLocalForDllExport(VD); | ||||
13237 | |||||
13238 | // Perform check for initializers of device-side global variables. | ||||
13239 | // CUDA allows empty constructors as initializers (see E.2.3.1, CUDA | ||||
13240 | // 7.5). We must also apply the same checks to all __shared__ | ||||
13241 | // variables whether they are local or not. CUDA also allows | ||||
13242 | // constant initializers for __constant__ and __device__ variables. | ||||
13243 | if (getLangOpts().CUDA) | ||||
13244 | checkAllowedCUDAInitializer(VD); | ||||
13245 | |||||
13246 | // Grab the dllimport or dllexport attribute off of the VarDecl. | ||||
13247 | const InheritableAttr *DLLAttr = getDLLAttr(VD); | ||||
13248 | |||||
13249 | // Imported static data members cannot be defined out-of-line. | ||||
13250 | if (const auto *IA = dyn_cast_or_null<DLLImportAttr>(DLLAttr)) { | ||||
13251 | if (VD->isStaticDataMember() && VD->isOutOfLine() && | ||||
13252 | VD->isThisDeclarationADefinition()) { | ||||
13253 | // We allow definitions of dllimport class template static data members | ||||
13254 | // with a warning. | ||||
13255 | CXXRecordDecl *Context = | ||||
13256 | cast<CXXRecordDecl>(VD->getFirstDecl()->getDeclContext()); | ||||
13257 | bool IsClassTemplateMember = | ||||
13258 | isa<ClassTemplatePartialSpecializationDecl>(Context) || | ||||
13259 | Context->getDescribedClassTemplate(); | ||||
13260 | |||||
13261 | Diag(VD->getLocation(), | ||||
13262 | IsClassTemplateMember | ||||
13263 | ? diag::warn_attribute_dllimport_static_field_definition | ||||
13264 | : diag::err_attribute_dllimport_static_field_definition); | ||||
13265 | Diag(IA->getLocation(), diag::note_attribute); | ||||
13266 | if (!IsClassTemplateMember) | ||||
13267 | VD->setInvalidDecl(); | ||||
13268 | } | ||||
13269 | } | ||||
13270 | |||||
13271 | // dllimport/dllexport variables cannot be thread local, their TLS index | ||||
13272 | // isn't exported with the variable. | ||||
13273 | if (DLLAttr && VD->getTLSKind()) { | ||||
13274 | auto *F = dyn_cast_or_null<FunctionDecl>(VD->getParentFunctionOrMethod()); | ||||
13275 | if (F && getDLLAttr(F)) { | ||||
13276 | assert(VD->isStaticLocal())((VD->isStaticLocal()) ? static_cast<void> (0) : __assert_fail ("VD->isStaticLocal()", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 13276, __PRETTY_FUNCTION__)); | ||||
13277 | // But if this is a static local in a dlimport/dllexport function, the | ||||
13278 | // function will never be inlined, which means the var would never be | ||||
13279 | // imported, so having it marked import/export is safe. | ||||
13280 | } else { | ||||
13281 | Diag(VD->getLocation(), diag::err_attribute_dll_thread_local) << VD | ||||
13282 | << DLLAttr; | ||||
13283 | VD->setInvalidDecl(); | ||||
13284 | } | ||||
13285 | } | ||||
13286 | |||||
13287 | if (UsedAttr *Attr = VD->getAttr<UsedAttr>()) { | ||||
13288 | if (!Attr->isInherited() && !VD->isThisDeclarationADefinition()) { | ||||
13289 | Diag(Attr->getLocation(), diag::warn_attribute_ignored) << Attr; | ||||
13290 | VD->dropAttr<UsedAttr>(); | ||||
13291 | } | ||||
13292 | } | ||||
13293 | |||||
13294 | const DeclContext *DC = VD->getDeclContext(); | ||||
13295 | // If there's a #pragma GCC visibility in scope, and this isn't a class | ||||
13296 | // member, set the visibility of this variable. | ||||
13297 | if (DC->getRedeclContext()->isFileContext() && VD->isExternallyVisible()) | ||||
13298 | AddPushedVisibilityAttribute(VD); | ||||
13299 | |||||
13300 | // FIXME: Warn on unused var template partial specializations. | ||||
13301 | if (VD->isFileVarDecl() && !isa<VarTemplatePartialSpecializationDecl>(VD)) | ||||
13302 | MarkUnusedFileScopedDecl(VD); | ||||
13303 | |||||
13304 | // Now we have parsed the initializer and can update the table of magic | ||||
13305 | // tag values. | ||||
13306 | if (!VD->hasAttr<TypeTagForDatatypeAttr>() || | ||||
13307 | !VD->getType()->isIntegralOrEnumerationType()) | ||||
13308 | return; | ||||
13309 | |||||
13310 | for (const auto *I : ThisDecl->specific_attrs<TypeTagForDatatypeAttr>()) { | ||||
13311 | const Expr *MagicValueExpr = VD->getInit(); | ||||
13312 | if (!MagicValueExpr) { | ||||
13313 | continue; | ||||
13314 | } | ||||
13315 | Optional<llvm::APSInt> MagicValueInt; | ||||
13316 | if (!(MagicValueInt = MagicValueExpr->getIntegerConstantExpr(Context))) { | ||||
13317 | Diag(I->getRange().getBegin(), | ||||
13318 | diag::err_type_tag_for_datatype_not_ice) | ||||
13319 | << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange(); | ||||
13320 | continue; | ||||
13321 | } | ||||
13322 | if (MagicValueInt->getActiveBits() > 64) { | ||||
13323 | Diag(I->getRange().getBegin(), | ||||
13324 | diag::err_type_tag_for_datatype_too_large) | ||||
13325 | << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange(); | ||||
13326 | continue; | ||||
13327 | } | ||||
13328 | uint64_t MagicValue = MagicValueInt->getZExtValue(); | ||||
13329 | RegisterTypeTagForDatatype(I->getArgumentKind(), | ||||
13330 | MagicValue, | ||||
13331 | I->getMatchingCType(), | ||||
13332 | I->getLayoutCompatible(), | ||||
13333 | I->getMustBeNull()); | ||||
13334 | } | ||||
13335 | } | ||||
13336 | |||||
13337 | static bool hasDeducedAuto(DeclaratorDecl *DD) { | ||||
13338 | auto *VD = dyn_cast<VarDecl>(DD); | ||||
13339 | return VD && !VD->getType()->hasAutoForTrailingReturnType(); | ||||
13340 | } | ||||
13341 | |||||
13342 | Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, | ||||
13343 | ArrayRef<Decl *> Group) { | ||||
13344 | SmallVector<Decl*, 8> Decls; | ||||
13345 | |||||
13346 | if (DS.isTypeSpecOwned()) | ||||
13347 | Decls.push_back(DS.getRepAsDecl()); | ||||
13348 | |||||
13349 | DeclaratorDecl *FirstDeclaratorInGroup = nullptr; | ||||
13350 | DecompositionDecl *FirstDecompDeclaratorInGroup = nullptr; | ||||
13351 | bool DiagnosedMultipleDecomps = false; | ||||
13352 | DeclaratorDecl *FirstNonDeducedAutoInGroup = nullptr; | ||||
13353 | bool DiagnosedNonDeducedAuto = false; | ||||
13354 | |||||
13355 | for (unsigned i = 0, e = Group.size(); i != e; ++i) { | ||||
13356 | if (Decl *D = Group[i]) { | ||||
13357 | // For declarators, there are some additional syntactic-ish checks we need | ||||
13358 | // to perform. | ||||
13359 | if (auto *DD = dyn_cast<DeclaratorDecl>(D)) { | ||||
13360 | if (!FirstDeclaratorInGroup) | ||||
13361 | FirstDeclaratorInGroup = DD; | ||||
13362 | if (!FirstDecompDeclaratorInGroup) | ||||
13363 | FirstDecompDeclaratorInGroup = dyn_cast<DecompositionDecl>(D); | ||||
13364 | if (!FirstNonDeducedAutoInGroup && DS.hasAutoTypeSpec() && | ||||
13365 | !hasDeducedAuto(DD)) | ||||
13366 | FirstNonDeducedAutoInGroup = DD; | ||||
13367 | |||||
13368 | if (FirstDeclaratorInGroup != DD) { | ||||
13369 | // A decomposition declaration cannot be combined with any other | ||||
13370 | // declaration in the same group. | ||||
13371 | if (FirstDecompDeclaratorInGroup && !DiagnosedMultipleDecomps) { | ||||
13372 | Diag(FirstDecompDeclaratorInGroup->getLocation(), | ||||
13373 | diag::err_decomp_decl_not_alone) | ||||
13374 | << FirstDeclaratorInGroup->getSourceRange() | ||||
13375 | << DD->getSourceRange(); | ||||
13376 | DiagnosedMultipleDecomps = true; | ||||
13377 | } | ||||
13378 | |||||
13379 | // A declarator that uses 'auto' in any way other than to declare a | ||||
13380 | // variable with a deduced type cannot be combined with any other | ||||
13381 | // declarator in the same group. | ||||
13382 | if (FirstNonDeducedAutoInGroup && !DiagnosedNonDeducedAuto) { | ||||
13383 | Diag(FirstNonDeducedAutoInGroup->getLocation(), | ||||
13384 | diag::err_auto_non_deduced_not_alone) | ||||
13385 | << FirstNonDeducedAutoInGroup->getType() | ||||
13386 | ->hasAutoForTrailingReturnType() | ||||
13387 | << FirstDeclaratorInGroup->getSourceRange() | ||||
13388 | << DD->getSourceRange(); | ||||
13389 | DiagnosedNonDeducedAuto = true; | ||||
13390 | } | ||||
13391 | } | ||||
13392 | } | ||||
13393 | |||||
13394 | Decls.push_back(D); | ||||
13395 | } | ||||
13396 | } | ||||
13397 | |||||
13398 | if (DeclSpec::isDeclRep(DS.getTypeSpecType())) { | ||||
13399 | if (TagDecl *Tag = dyn_cast_or_null<TagDecl>(DS.getRepAsDecl())) { | ||||
13400 | handleTagNumbering(Tag, S); | ||||
13401 | if (FirstDeclaratorInGroup && !Tag->hasNameForLinkage() && | ||||
13402 | getLangOpts().CPlusPlus) | ||||
13403 | Context.addDeclaratorForUnnamedTagDecl(Tag, FirstDeclaratorInGroup); | ||||
13404 | } | ||||
13405 | } | ||||
13406 | |||||
13407 | return BuildDeclaratorGroup(Decls); | ||||
13408 | } | ||||
13409 | |||||
13410 | /// BuildDeclaratorGroup - convert a list of declarations into a declaration | ||||
13411 | /// group, performing any necessary semantic checking. | ||||
13412 | Sema::DeclGroupPtrTy | ||||
13413 | Sema::BuildDeclaratorGroup(MutableArrayRef<Decl *> Group) { | ||||
13414 | // C++14 [dcl.spec.auto]p7: (DR1347) | ||||
13415 | // If the type that replaces the placeholder type is not the same in each | ||||
13416 | // deduction, the program is ill-formed. | ||||
13417 | if (Group.size() > 1) { | ||||
13418 | QualType Deduced; | ||||
13419 | VarDecl *DeducedDecl = nullptr; | ||||
13420 | for (unsigned i = 0, e = Group.size(); i != e; ++i) { | ||||
13421 | VarDecl *D = dyn_cast<VarDecl>(Group[i]); | ||||
13422 | if (!D || D->isInvalidDecl()) | ||||
13423 | break; | ||||
13424 | DeducedType *DT = D->getType()->getContainedDeducedType(); | ||||
13425 | if (!DT || DT->getDeducedType().isNull()) | ||||
13426 | continue; | ||||
13427 | if (Deduced.isNull()) { | ||||
13428 | Deduced = DT->getDeducedType(); | ||||
13429 | DeducedDecl = D; | ||||
13430 | } else if (!Context.hasSameType(DT->getDeducedType(), Deduced)) { | ||||
13431 | auto *AT = dyn_cast<AutoType>(DT); | ||||
13432 | auto Dia = Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), | ||||
13433 | diag::err_auto_different_deductions) | ||||
13434 | << (AT ? (unsigned)AT->getKeyword() : 3) << Deduced | ||||
13435 | << DeducedDecl->getDeclName() << DT->getDeducedType() | ||||
13436 | << D->getDeclName(); | ||||
13437 | if (DeducedDecl->hasInit()) | ||||
13438 | Dia << DeducedDecl->getInit()->getSourceRange(); | ||||
13439 | if (D->getInit()) | ||||
13440 | Dia << D->getInit()->getSourceRange(); | ||||
13441 | D->setInvalidDecl(); | ||||
13442 | break; | ||||
13443 | } | ||||
13444 | } | ||||
13445 | } | ||||
13446 | |||||
13447 | ActOnDocumentableDecls(Group); | ||||
13448 | |||||
13449 | return DeclGroupPtrTy::make( | ||||
13450 | DeclGroupRef::Create(Context, Group.data(), Group.size())); | ||||
13451 | } | ||||
13452 | |||||
13453 | void Sema::ActOnDocumentableDecl(Decl *D) { | ||||
13454 | ActOnDocumentableDecls(D); | ||||
13455 | } | ||||
13456 | |||||
13457 | void Sema::ActOnDocumentableDecls(ArrayRef<Decl *> Group) { | ||||
13458 | // Don't parse the comment if Doxygen diagnostics are ignored. | ||||
13459 | if (Group.empty() || !Group[0]) | ||||
13460 | return; | ||||
13461 | |||||
13462 | if (Diags.isIgnored(diag::warn_doc_param_not_found, | ||||
13463 | Group[0]->getLocation()) && | ||||
13464 | Diags.isIgnored(diag::warn_unknown_comment_command_name, | ||||
13465 | Group[0]->getLocation())) | ||||
13466 | return; | ||||
13467 | |||||
13468 | if (Group.size() >= 2) { | ||||
13469 | // This is a decl group. Normally it will contain only declarations | ||||
13470 | // produced from declarator list. But in case we have any definitions or | ||||
13471 | // additional declaration references: | ||||
13472 | // 'typedef struct S {} S;' | ||||
13473 | // 'typedef struct S *S;' | ||||
13474 | // 'struct S *pS;' | ||||
13475 | // FinalizeDeclaratorGroup adds these as separate declarations. | ||||
13476 | Decl *MaybeTagDecl = Group[0]; | ||||
13477 | if (MaybeTagDecl && isa<TagDecl>(MaybeTagDecl)) { | ||||
13478 | Group = Group.slice(1); | ||||
13479 | } | ||||
13480 | } | ||||
13481 | |||||
13482 | // FIMXE: We assume every Decl in the group is in the same file. | ||||
13483 | // This is false when preprocessor constructs the group from decls in | ||||
13484 | // different files (e. g. macros or #include). | ||||
13485 | Context.attachCommentsToJustParsedDecls(Group, &getPreprocessor()); | ||||
13486 | } | ||||
13487 | |||||
13488 | /// Common checks for a parameter-declaration that should apply to both function | ||||
13489 | /// parameters and non-type template parameters. | ||||
13490 | void Sema::CheckFunctionOrTemplateParamDeclarator(Scope *S, Declarator &D) { | ||||
13491 | // Check that there are no default arguments inside the type of this | ||||
13492 | // parameter. | ||||
13493 | if (getLangOpts().CPlusPlus) | ||||
13494 | CheckExtraCXXDefaultArguments(D); | ||||
13495 | |||||
13496 | // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). | ||||
13497 | if (D.getCXXScopeSpec().isSet()) { | ||||
13498 | Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) | ||||
13499 | << D.getCXXScopeSpec().getRange(); | ||||
13500 | } | ||||
13501 | |||||
13502 | // [dcl.meaning]p1: An unqualified-id occurring in a declarator-id shall be a | ||||
13503 | // simple identifier except [...irrelevant cases...]. | ||||
13504 | switch (D.getName().getKind()) { | ||||
13505 | case UnqualifiedIdKind::IK_Identifier: | ||||
13506 | break; | ||||
13507 | |||||
13508 | case UnqualifiedIdKind::IK_OperatorFunctionId: | ||||
13509 | case UnqualifiedIdKind::IK_ConversionFunctionId: | ||||
13510 | case UnqualifiedIdKind::IK_LiteralOperatorId: | ||||
13511 | case UnqualifiedIdKind::IK_ConstructorName: | ||||
13512 | case UnqualifiedIdKind::IK_DestructorName: | ||||
13513 | case UnqualifiedIdKind::IK_ImplicitSelfParam: | ||||
13514 | case UnqualifiedIdKind::IK_DeductionGuideName: | ||||
13515 | Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) | ||||
13516 | << GetNameForDeclarator(D).getName(); | ||||
13517 | break; | ||||
13518 | |||||
13519 | case UnqualifiedIdKind::IK_TemplateId: | ||||
13520 | case UnqualifiedIdKind::IK_ConstructorTemplateId: | ||||
13521 | // GetNameForDeclarator would not produce a useful name in this case. | ||||
13522 | Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name_template_id); | ||||
13523 | break; | ||||
13524 | } | ||||
13525 | } | ||||
13526 | |||||
13527 | /// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() | ||||
13528 | /// to introduce parameters into function prototype scope. | ||||
13529 | Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { | ||||
13530 | const DeclSpec &DS = D.getDeclSpec(); | ||||
13531 | |||||
13532 | // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. | ||||
13533 | |||||
13534 | // C++03 [dcl.stc]p2 also permits 'auto'. | ||||
13535 | StorageClass SC = SC_None; | ||||
13536 | if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { | ||||
13537 | SC = SC_Register; | ||||
13538 | // In C++11, the 'register' storage class specifier is deprecated. | ||||
13539 | // In C++17, it is not allowed, but we tolerate it as an extension. | ||||
13540 | if (getLangOpts().CPlusPlus11) { | ||||
13541 | Diag(DS.getStorageClassSpecLoc(), | ||||
13542 | getLangOpts().CPlusPlus17 ? diag::ext_register_storage_class | ||||
13543 | : diag::warn_deprecated_register) | ||||
13544 | << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); | ||||
13545 | } | ||||
13546 | } else if (getLangOpts().CPlusPlus && | ||||
13547 | DS.getStorageClassSpec() == DeclSpec::SCS_auto) { | ||||
13548 | SC = SC_Auto; | ||||
13549 | } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { | ||||
13550 | Diag(DS.getStorageClassSpecLoc(), | ||||
13551 | diag::err_invalid_storage_class_in_func_decl); | ||||
13552 | D.getMutableDeclSpec().ClearStorageClassSpecs(); | ||||
13553 | } | ||||
13554 | |||||
13555 | if (DeclSpec::TSCS TSCS = DS.getThreadStorageClassSpec()) | ||||
13556 | Diag(DS.getThreadStorageClassSpecLoc(), diag::err_invalid_thread) | ||||
13557 | << DeclSpec::getSpecifierName(TSCS); | ||||
13558 | if (DS.isInlineSpecified()) | ||||
13559 | Diag(DS.getInlineSpecLoc(), diag::err_inline_non_function) | ||||
13560 | << getLangOpts().CPlusPlus17; | ||||
13561 | if (DS.hasConstexprSpecifier()) | ||||
13562 | Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr) | ||||
13563 | << 0 << static_cast<int>(D.getDeclSpec().getConstexprSpecifier()); | ||||
13564 | |||||
13565 | DiagnoseFunctionSpecifiers(DS); | ||||
13566 | |||||
13567 | CheckFunctionOrTemplateParamDeclarator(S, D); | ||||
13568 | |||||
13569 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); | ||||
13570 | QualType parmDeclType = TInfo->getType(); | ||||
13571 | |||||
13572 | // Check for redeclaration of parameters, e.g. int foo(int x, int x); | ||||
13573 | IdentifierInfo *II = D.getIdentifier(); | ||||
13574 | if (II) { | ||||
13575 | LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, | ||||
13576 | ForVisibleRedeclaration); | ||||
13577 | LookupName(R, S); | ||||
13578 | if (R.isSingleResult()) { | ||||
13579 | NamedDecl *PrevDecl = R.getFoundDecl(); | ||||
13580 | if (PrevDecl->isTemplateParameter()) { | ||||
13581 | // Maybe we will complain about the shadowed template parameter. | ||||
13582 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); | ||||
13583 | // Just pretend that we didn't see the previous declaration. | ||||
13584 | PrevDecl = nullptr; | ||||
13585 | } else if (S->isDeclScope(PrevDecl)) { | ||||
13586 | Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; | ||||
13587 | Diag(PrevDecl->getLocation(), diag::note_previous_declaration); | ||||
13588 | |||||
13589 | // Recover by removing the name | ||||
13590 | II = nullptr; | ||||
13591 | D.SetIdentifier(nullptr, D.getIdentifierLoc()); | ||||
13592 | D.setInvalidType(true); | ||||
13593 | } | ||||
13594 | } | ||||
13595 | } | ||||
13596 | |||||
13597 | // Temporarily put parameter variables in the translation unit, not | ||||
13598 | // the enclosing context. This prevents them from accidentally | ||||
13599 | // looking like class members in C++. | ||||
13600 | ParmVarDecl *New = | ||||
13601 | CheckParameter(Context.getTranslationUnitDecl(), D.getBeginLoc(), | ||||
13602 | D.getIdentifierLoc(), II, parmDeclType, TInfo, SC); | ||||
13603 | |||||
13604 | if (D.isInvalidType()) | ||||
13605 | New->setInvalidDecl(); | ||||
13606 | |||||
13607 | assert(S->isFunctionPrototypeScope())((S->isFunctionPrototypeScope()) ? static_cast<void> (0) : __assert_fail ("S->isFunctionPrototypeScope()", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 13607, __PRETTY_FUNCTION__)); | ||||
13608 | assert(S->getFunctionPrototypeDepth() >= 1)((S->getFunctionPrototypeDepth() >= 1) ? static_cast< void> (0) : __assert_fail ("S->getFunctionPrototypeDepth() >= 1" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 13608, __PRETTY_FUNCTION__)); | ||||
13609 | New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, | ||||
13610 | S->getNextFunctionPrototypeIndex()); | ||||
13611 | |||||
13612 | // Add the parameter declaration into this scope. | ||||
13613 | S->AddDecl(New); | ||||
13614 | if (II) | ||||
13615 | IdResolver.AddDecl(New); | ||||
13616 | |||||
13617 | ProcessDeclAttributes(S, New, D); | ||||
13618 | |||||
13619 | if (D.getDeclSpec().isModulePrivateSpecified()) | ||||
13620 | Diag(New->getLocation(), diag::err_module_private_local) | ||||
13621 | << 1 << New << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) | ||||
13622 | << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); | ||||
13623 | |||||
13624 | if (New->hasAttr<BlocksAttr>()) { | ||||
13625 | Diag(New->getLocation(), diag::err_block_on_nonlocal); | ||||
13626 | } | ||||
13627 | |||||
13628 | if (getLangOpts().OpenCL) | ||||
13629 | deduceOpenCLAddressSpace(New); | ||||
13630 | |||||
13631 | return New; | ||||
13632 | } | ||||
13633 | |||||
13634 | /// Synthesizes a variable for a parameter arising from a | ||||
13635 | /// typedef. | ||||
13636 | ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, | ||||
13637 | SourceLocation Loc, | ||||
13638 | QualType T) { | ||||
13639 | /* FIXME: setting StartLoc == Loc. | ||||
13640 | Would it be worth to modify callers so as to provide proper source | ||||
13641 | location for the unnamed parameters, embedding the parameter's type? */ | ||||
13642 | ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, nullptr, | ||||
13643 | T, Context.getTrivialTypeSourceInfo(T, Loc), | ||||
13644 | SC_None, nullptr); | ||||
13645 | Param->setImplicit(); | ||||
13646 | return Param; | ||||
13647 | } | ||||
13648 | |||||
13649 | void Sema::DiagnoseUnusedParameters(ArrayRef<ParmVarDecl *> Parameters) { | ||||
13650 | // Don't diagnose unused-parameter errors in template instantiations; we | ||||
13651 | // will already have done so in the template itself. | ||||
13652 | if (inTemplateInstantiation()) | ||||
13653 | return; | ||||
13654 | |||||
13655 | for (const ParmVarDecl *Parameter : Parameters) { | ||||
13656 | if (!Parameter->isReferenced() && Parameter->getDeclName() && | ||||
13657 | !Parameter->hasAttr<UnusedAttr>()) { | ||||
13658 | Diag(Parameter->getLocation(), diag::warn_unused_parameter) | ||||
13659 | << Parameter->getDeclName(); | ||||
13660 | } | ||||
13661 | } | ||||
13662 | } | ||||
13663 | |||||
13664 | void Sema::DiagnoseSizeOfParametersAndReturnValue( | ||||
13665 | ArrayRef<ParmVarDecl *> Parameters, QualType ReturnTy, NamedDecl *D) { | ||||
13666 | if (LangOpts.NumLargeByValueCopy == 0) // No check. | ||||
13667 | return; | ||||
13668 | |||||
13669 | // Warn if the return value is pass-by-value and larger than the specified | ||||
13670 | // threshold. | ||||
13671 | if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { | ||||
13672 | unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); | ||||
13673 | if (Size > LangOpts.NumLargeByValueCopy) | ||||
13674 | Diag(D->getLocation(), diag::warn_return_value_size) << D << Size; | ||||
13675 | } | ||||
13676 | |||||
13677 | // Warn if any parameter is pass-by-value and larger than the specified | ||||
13678 | // threshold. | ||||
13679 | for (const ParmVarDecl *Parameter : Parameters) { | ||||
13680 | QualType T = Parameter->getType(); | ||||
13681 | if (T->isDependentType() || !T.isPODType(Context)) | ||||
13682 | continue; | ||||
13683 | unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); | ||||
13684 | if (Size > LangOpts.NumLargeByValueCopy) | ||||
13685 | Diag(Parameter->getLocation(), diag::warn_parameter_size) | ||||
13686 | << Parameter << Size; | ||||
13687 | } | ||||
13688 | } | ||||
13689 | |||||
13690 | ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, | ||||
13691 | SourceLocation NameLoc, IdentifierInfo *Name, | ||||
13692 | QualType T, TypeSourceInfo *TSInfo, | ||||
13693 | StorageClass SC) { | ||||
13694 | // In ARC, infer a lifetime qualifier for appropriate parameter types. | ||||
13695 | if (getLangOpts().ObjCAutoRefCount && | ||||
13696 | T.getObjCLifetime() == Qualifiers::OCL_None && | ||||
13697 | T->isObjCLifetimeType()) { | ||||
13698 | |||||
13699 | Qualifiers::ObjCLifetime lifetime; | ||||
13700 | |||||
13701 | // Special cases for arrays: | ||||
13702 | // - if it's const, use __unsafe_unretained | ||||
13703 | // - otherwise, it's an error | ||||
13704 | if (T->isArrayType()) { | ||||
13705 | if (!T.isConstQualified()) { | ||||
13706 | if (DelayedDiagnostics.shouldDelayDiagnostics()) | ||||
13707 | DelayedDiagnostics.add( | ||||
13708 | sema::DelayedDiagnostic::makeForbiddenType( | ||||
13709 | NameLoc, diag::err_arc_array_param_no_ownership, T, false)); | ||||
13710 | else | ||||
13711 | Diag(NameLoc, diag::err_arc_array_param_no_ownership) | ||||
13712 | << TSInfo->getTypeLoc().getSourceRange(); | ||||
13713 | } | ||||
13714 | lifetime = Qualifiers::OCL_ExplicitNone; | ||||
13715 | } else { | ||||
13716 | lifetime = T->getObjCARCImplicitLifetime(); | ||||
13717 | } | ||||
13718 | T = Context.getLifetimeQualifiedType(T, lifetime); | ||||
13719 | } | ||||
13720 | |||||
13721 | ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, | ||||
13722 | Context.getAdjustedParameterType(T), | ||||
13723 | TSInfo, SC, nullptr); | ||||
13724 | |||||
13725 | // Make a note if we created a new pack in the scope of a lambda, so that | ||||
13726 | // we know that references to that pack must also be expanded within the | ||||
13727 | // lambda scope. | ||||
13728 | if (New->isParameterPack()) | ||||
13729 | if (auto *LSI = getEnclosingLambda()) | ||||
13730 | LSI->LocalPacks.push_back(New); | ||||
13731 | |||||
13732 | if (New->getType().hasNonTrivialToPrimitiveDestructCUnion() || | ||||
13733 | New->getType().hasNonTrivialToPrimitiveCopyCUnion()) | ||||
13734 | checkNonTrivialCUnion(New->getType(), New->getLocation(), | ||||
13735 | NTCUC_FunctionParam, NTCUK_Destruct|NTCUK_Copy); | ||||
13736 | |||||
13737 | // Parameters can not be abstract class types. | ||||
13738 | // For record types, this is done by the AbstractClassUsageDiagnoser once | ||||
13739 | // the class has been completely parsed. | ||||
13740 | if (!CurContext->isRecord() && | ||||
13741 | RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, | ||||
13742 | AbstractParamType)) | ||||
13743 | New->setInvalidDecl(); | ||||
13744 | |||||
13745 | // Parameter declarators cannot be interface types. All ObjC objects are | ||||
13746 | // passed by reference. | ||||
13747 | if (T->isObjCObjectType()) { | ||||
13748 | SourceLocation TypeEndLoc = | ||||
13749 | getLocForEndOfToken(TSInfo->getTypeLoc().getEndLoc()); | ||||
13750 | Diag(NameLoc, | ||||
13751 | diag::err_object_cannot_be_passed_returned_by_value) << 1 << T | ||||
13752 | << FixItHint::CreateInsertion(TypeEndLoc, "*"); | ||||
13753 | T = Context.getObjCObjectPointerType(T); | ||||
13754 | New->setType(T); | ||||
13755 | } | ||||
13756 | |||||
13757 | // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage | ||||
13758 | // duration shall not be qualified by an address-space qualifier." | ||||
13759 | // Since all parameters have automatic store duration, they can not have | ||||
13760 | // an address space. | ||||
13761 | if (T.getAddressSpace() != LangAS::Default && | ||||
13762 | // OpenCL allows function arguments declared to be an array of a type | ||||
13763 | // to be qualified with an address space. | ||||
13764 | !(getLangOpts().OpenCL && | ||||
13765 | (T->isArrayType() || T.getAddressSpace() == LangAS::opencl_private))) { | ||||
13766 | Diag(NameLoc, diag::err_arg_with_address_space); | ||||
13767 | New->setInvalidDecl(); | ||||
13768 | } | ||||
13769 | |||||
13770 | // PPC MMA non-pointer types are not allowed as function argument types. | ||||
13771 | if (Context.getTargetInfo().getTriple().isPPC64() && | ||||
13772 | CheckPPCMMAType(New->getOriginalType(), New->getLocation())) { | ||||
13773 | New->setInvalidDecl(); | ||||
13774 | } | ||||
13775 | |||||
13776 | return New; | ||||
13777 | } | ||||
13778 | |||||
13779 | void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, | ||||
13780 | SourceLocation LocAfterDecls) { | ||||
13781 | DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); | ||||
13782 | |||||
13783 | // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' | ||||
13784 | // for a K&R function. | ||||
13785 | if (!FTI.hasPrototype) { | ||||
13786 | for (int i = FTI.NumParams; i != 0; /* decrement in loop */) { | ||||
13787 | --i; | ||||
13788 | if (FTI.Params[i].Param == nullptr) { | ||||
13789 | SmallString<256> Code; | ||||
13790 | llvm::raw_svector_ostream(Code) | ||||
13791 | << " int " << FTI.Params[i].Ident->getName() << ";\n"; | ||||
13792 | Diag(FTI.Params[i].IdentLoc, diag::ext_param_not_declared) | ||||
13793 | << FTI.Params[i].Ident | ||||
13794 | << FixItHint::CreateInsertion(LocAfterDecls, Code); | ||||
13795 | |||||
13796 | // Implicitly declare the argument as type 'int' for lack of a better | ||||
13797 | // type. | ||||
13798 | AttributeFactory attrs; | ||||
13799 | DeclSpec DS(attrs); | ||||
13800 | const char* PrevSpec; // unused | ||||
13801 | unsigned DiagID; // unused | ||||
13802 | DS.SetTypeSpecType(DeclSpec::TST_int, FTI.Params[i].IdentLoc, PrevSpec, | ||||
13803 | DiagID, Context.getPrintingPolicy()); | ||||
13804 | // Use the identifier location for the type source range. | ||||
13805 | DS.SetRangeStart(FTI.Params[i].IdentLoc); | ||||
13806 | DS.SetRangeEnd(FTI.Params[i].IdentLoc); | ||||
13807 | Declarator ParamD(DS, DeclaratorContext::KNRTypeList); | ||||
13808 | ParamD.SetIdentifier(FTI.Params[i].Ident, FTI.Params[i].IdentLoc); | ||||
13809 | FTI.Params[i].Param = ActOnParamDeclarator(S, ParamD); | ||||
13810 | } | ||||
13811 | } | ||||
13812 | } | ||||
13813 | } | ||||
13814 | |||||
13815 | Decl * | ||||
13816 | Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D, | ||||
13817 | MultiTemplateParamsArg TemplateParameterLists, | ||||
13818 | SkipBodyInfo *SkipBody) { | ||||
13819 | assert(getCurFunctionDecl() == nullptr && "Function parsing confused")((getCurFunctionDecl() == nullptr && "Function parsing confused" ) ? static_cast<void> (0) : __assert_fail ("getCurFunctionDecl() == nullptr && \"Function parsing confused\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 13819, __PRETTY_FUNCTION__)); | ||||
13820 | assert(D.isFunctionDeclarator() && "Not a function declarator!")((D.isFunctionDeclarator() && "Not a function declarator!" ) ? static_cast<void> (0) : __assert_fail ("D.isFunctionDeclarator() && \"Not a function declarator!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 13820, __PRETTY_FUNCTION__)); | ||||
13821 | Scope *ParentScope = FnBodyScope->getParent(); | ||||
13822 | |||||
13823 | // Check if we are in an `omp begin/end declare variant` scope. If we are, and | ||||
13824 | // we define a non-templated function definition, we will create a declaration | ||||
13825 | // instead (=BaseFD), and emit the definition with a mangled name afterwards. | ||||
13826 | // The base function declaration will have the equivalent of an `omp declare | ||||
13827 | // variant` annotation which specifies the mangled definition as a | ||||
13828 | // specialization function under the OpenMP context defined as part of the | ||||
13829 | // `omp begin declare variant`. | ||||
13830 | SmallVector<FunctionDecl *, 4> Bases; | ||||
13831 | if (LangOpts.OpenMP && isInOpenMPDeclareVariantScope()) | ||||
13832 | ActOnStartOfFunctionDefinitionInOpenMPDeclareVariantScope( | ||||
13833 | ParentScope, D, TemplateParameterLists, Bases); | ||||
13834 | |||||
13835 | D.setFunctionDefinitionKind(FunctionDefinitionKind::Definition); | ||||
13836 | Decl *DP = HandleDeclarator(ParentScope, D, TemplateParameterLists); | ||||
13837 | Decl *Dcl = ActOnStartOfFunctionDef(FnBodyScope, DP, SkipBody); | ||||
13838 | |||||
13839 | if (!Bases.empty()) | ||||
13840 | ActOnFinishedFunctionDefinitionInOpenMPDeclareVariantScope(Dcl, Bases); | ||||
13841 | |||||
13842 | return Dcl; | ||||
13843 | } | ||||
13844 | |||||
13845 | void Sema::ActOnFinishInlineFunctionDef(FunctionDecl *D) { | ||||
13846 | Consumer.HandleInlineFunctionDefinition(D); | ||||
13847 | } | ||||
13848 | |||||
13849 | static bool | ||||
13850 | ShouldWarnAboutMissingPrototype(const FunctionDecl *FD, | ||||
13851 | const FunctionDecl *&PossiblePrototype) { | ||||
13852 | // Don't warn about invalid declarations. | ||||
13853 | if (FD->isInvalidDecl()) | ||||
13854 | return false; | ||||
13855 | |||||
13856 | // Or declarations that aren't global. | ||||
13857 | if (!FD->isGlobal()) | ||||
13858 | return false; | ||||
13859 | |||||
13860 | // Don't warn about C++ member functions. | ||||
13861 | if (isa<CXXMethodDecl>(FD)) | ||||
13862 | return false; | ||||
13863 | |||||
13864 | // Don't warn about 'main'. | ||||
13865 | if (isa<TranslationUnitDecl>(FD->getDeclContext()->getRedeclContext())) | ||||
13866 | if (IdentifierInfo *II = FD->getIdentifier()) | ||||
13867 | if (II->isStr("main")) | ||||
13868 | return false; | ||||
13869 | |||||
13870 | // Don't warn about inline functions. | ||||
13871 | if (FD->isInlined()) | ||||
13872 | return false; | ||||
13873 | |||||
13874 | // Don't warn about function templates. | ||||
13875 | if (FD->getDescribedFunctionTemplate()) | ||||
13876 | return false; | ||||
13877 | |||||
13878 | // Don't warn about function template specializations. | ||||
13879 | if (FD->isFunctionTemplateSpecialization()) | ||||
13880 | return false; | ||||
13881 | |||||
13882 | // Don't warn for OpenCL kernels. | ||||
13883 | if (FD->hasAttr<OpenCLKernelAttr>()) | ||||
13884 | return false; | ||||
13885 | |||||
13886 | // Don't warn on explicitly deleted functions. | ||||
13887 | if (FD->isDeleted()) | ||||
13888 | return false; | ||||
13889 | |||||
13890 | for (const FunctionDecl *Prev = FD->getPreviousDecl(); | ||||
13891 | Prev; Prev = Prev->getPreviousDecl()) { | ||||
13892 | // Ignore any declarations that occur in function or method | ||||
13893 | // scope, because they aren't visible from the header. | ||||
13894 | if (Prev->getLexicalDeclContext()->isFunctionOrMethod()) | ||||
13895 | continue; | ||||
13896 | |||||
13897 | PossiblePrototype = Prev; | ||||
13898 | return Prev->getType()->isFunctionNoProtoType(); | ||||
13899 | } | ||||
13900 | |||||
13901 | return true; | ||||
13902 | } | ||||
13903 | |||||
13904 | void | ||||
13905 | Sema::CheckForFunctionRedefinition(FunctionDecl *FD, | ||||
13906 | const FunctionDecl *EffectiveDefinition, | ||||
13907 | SkipBodyInfo *SkipBody) { | ||||
13908 | const FunctionDecl *Definition = EffectiveDefinition; | ||||
13909 | if (!Definition && | ||||
13910 | !FD->isDefined(Definition, /*CheckForPendingFriendDefinition*/ true)) | ||||
13911 | return; | ||||
13912 | |||||
13913 | if (Definition->getFriendObjectKind() != Decl::FOK_None) { | ||||
13914 | if (FunctionDecl *OrigDef = Definition->getInstantiatedFromMemberFunction()) { | ||||
13915 | if (FunctionDecl *OrigFD = FD->getInstantiatedFromMemberFunction()) { | ||||
13916 | // A merged copy of the same function, instantiated as a member of | ||||
13917 | // the same class, is OK. | ||||
13918 | if (declaresSameEntity(OrigFD, OrigDef) && | ||||
13919 | declaresSameEntity(cast<Decl>(Definition->getLexicalDeclContext()), | ||||
13920 | cast<Decl>(FD->getLexicalDeclContext()))) | ||||
13921 | return; | ||||
13922 | } | ||||
13923 | } | ||||
13924 | } | ||||
13925 | |||||
13926 | if (canRedefineFunction(Definition, getLangOpts())) | ||||
13927 | return; | ||||
13928 | |||||
13929 | // Don't emit an error when this is redefinition of a typo-corrected | ||||
13930 | // definition. | ||||
13931 | if (TypoCorrectedFunctionDefinitions.count(Definition)) | ||||
13932 | return; | ||||
13933 | |||||
13934 | // If we don't have a visible definition of the function, and it's inline or | ||||
13935 | // a template, skip the new definition. | ||||
13936 | if (SkipBody && !hasVisibleDefinition(Definition) && | ||||
13937 | (Definition->getFormalLinkage() == InternalLinkage || | ||||
13938 | Definition->isInlined() || | ||||
13939 | Definition->getDescribedFunctionTemplate() || | ||||
13940 | Definition->getNumTemplateParameterLists())) { | ||||
13941 | SkipBody->ShouldSkip = true; | ||||
13942 | SkipBody->Previous = const_cast<FunctionDecl*>(Definition); | ||||
13943 | if (auto *TD = Definition->getDescribedFunctionTemplate()) | ||||
13944 | makeMergedDefinitionVisible(TD); | ||||
13945 | makeMergedDefinitionVisible(const_cast<FunctionDecl*>(Definition)); | ||||
13946 | return; | ||||
13947 | } | ||||
13948 | |||||
13949 | if (getLangOpts().GNUMode && Definition->isInlineSpecified() && | ||||
13950 | Definition->getStorageClass() == SC_Extern) | ||||
13951 | Diag(FD->getLocation(), diag::err_redefinition_extern_inline) | ||||
13952 | << FD << getLangOpts().CPlusPlus; | ||||
13953 | else | ||||
13954 | Diag(FD->getLocation(), diag::err_redefinition) << FD; | ||||
13955 | |||||
13956 | Diag(Definition->getLocation(), diag::note_previous_definition); | ||||
13957 | FD->setInvalidDecl(); | ||||
13958 | } | ||||
13959 | |||||
13960 | static void RebuildLambdaScopeInfo(CXXMethodDecl *CallOperator, | ||||
13961 | Sema &S) { | ||||
13962 | CXXRecordDecl *const LambdaClass = CallOperator->getParent(); | ||||
13963 | |||||
13964 | LambdaScopeInfo *LSI = S.PushLambdaScope(); | ||||
13965 | LSI->CallOperator = CallOperator; | ||||
13966 | LSI->Lambda = LambdaClass; | ||||
13967 | LSI->ReturnType = CallOperator->getReturnType(); | ||||
13968 | const LambdaCaptureDefault LCD = LambdaClass->getLambdaCaptureDefault(); | ||||
13969 | |||||
13970 | if (LCD == LCD_None) | ||||
13971 | LSI->ImpCaptureStyle = CapturingScopeInfo::ImpCap_None; | ||||
13972 | else if (LCD == LCD_ByCopy) | ||||
13973 | LSI->ImpCaptureStyle = CapturingScopeInfo::ImpCap_LambdaByval; | ||||
13974 | else if (LCD == LCD_ByRef) | ||||
13975 | LSI->ImpCaptureStyle = CapturingScopeInfo::ImpCap_LambdaByref; | ||||
13976 | DeclarationNameInfo DNI = CallOperator->getNameInfo(); | ||||
13977 | |||||
13978 | LSI->IntroducerRange = DNI.getCXXOperatorNameRange(); | ||||
13979 | LSI->Mutable = !CallOperator->isConst(); | ||||
13980 | |||||
13981 | // Add the captures to the LSI so they can be noted as already | ||||
13982 | // captured within tryCaptureVar. | ||||
13983 | auto I = LambdaClass->field_begin(); | ||||
13984 | for (const auto &C : LambdaClass->captures()) { | ||||
13985 | if (C.capturesVariable()) { | ||||
13986 | VarDecl *VD = C.getCapturedVar(); | ||||
13987 | if (VD->isInitCapture()) | ||||
13988 | S.CurrentInstantiationScope->InstantiatedLocal(VD, VD); | ||||
13989 | const bool ByRef = C.getCaptureKind() == LCK_ByRef; | ||||
13990 | LSI->addCapture(VD, /*IsBlock*/false, ByRef, | ||||
13991 | /*RefersToEnclosingVariableOrCapture*/true, C.getLocation(), | ||||
13992 | /*EllipsisLoc*/C.isPackExpansion() | ||||
13993 | ? C.getEllipsisLoc() : SourceLocation(), | ||||
13994 | I->getType(), /*Invalid*/false); | ||||
13995 | |||||
13996 | } else if (C.capturesThis()) { | ||||
13997 | LSI->addThisCapture(/*Nested*/ false, C.getLocation(), I->getType(), | ||||
13998 | C.getCaptureKind() == LCK_StarThis); | ||||
13999 | } else { | ||||
14000 | LSI->addVLATypeCapture(C.getLocation(), I->getCapturedVLAType(), | ||||
14001 | I->getType()); | ||||
14002 | } | ||||
14003 | ++I; | ||||
14004 | } | ||||
14005 | } | ||||
14006 | |||||
14007 | Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D, | ||||
14008 | SkipBodyInfo *SkipBody) { | ||||
14009 | if (!D) { | ||||
14010 | // Parsing the function declaration failed in some way. Push on a fake scope | ||||
14011 | // anyway so we can try to parse the function body. | ||||
14012 | PushFunctionScope(); | ||||
14013 | PushExpressionEvaluationContext(ExprEvalContexts.back().Context); | ||||
14014 | return D; | ||||
14015 | } | ||||
14016 | |||||
14017 | FunctionDecl *FD = nullptr; | ||||
14018 | |||||
14019 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) | ||||
14020 | FD = FunTmpl->getTemplatedDecl(); | ||||
14021 | else | ||||
14022 | FD = cast<FunctionDecl>(D); | ||||
14023 | |||||
14024 | // Do not push if it is a lambda because one is already pushed when building | ||||
14025 | // the lambda in ActOnStartOfLambdaDefinition(). | ||||
14026 | if (!isLambdaCallOperator(FD)) | ||||
14027 | PushExpressionEvaluationContext( | ||||
14028 | FD->isConsteval() ? ExpressionEvaluationContext::ConstantEvaluated | ||||
14029 | : ExprEvalContexts.back().Context); | ||||
14030 | |||||
14031 | // Check for defining attributes before the check for redefinition. | ||||
14032 | if (const auto *Attr = FD->getAttr<AliasAttr>()) { | ||||
14033 | Diag(Attr->getLocation(), diag::err_alias_is_definition) << FD << 0; | ||||
14034 | FD->dropAttr<AliasAttr>(); | ||||
14035 | FD->setInvalidDecl(); | ||||
14036 | } | ||||
14037 | if (const auto *Attr = FD->getAttr<IFuncAttr>()) { | ||||
14038 | Diag(Attr->getLocation(), diag::err_alias_is_definition) << FD << 1; | ||||
14039 | FD->dropAttr<IFuncAttr>(); | ||||
14040 | FD->setInvalidDecl(); | ||||
14041 | } | ||||
14042 | |||||
14043 | if (auto *Ctor = dyn_cast<CXXConstructorDecl>(FD)) { | ||||
14044 | if (Ctor->getTemplateSpecializationKind() == TSK_ExplicitSpecialization && | ||||
14045 | Ctor->isDefaultConstructor() && | ||||
14046 | Context.getTargetInfo().getCXXABI().isMicrosoft()) { | ||||
14047 | // If this is an MS ABI dllexport default constructor, instantiate any | ||||
14048 | // default arguments. | ||||
14049 | InstantiateDefaultCtorDefaultArgs(Ctor); | ||||
14050 | } | ||||
14051 | } | ||||
14052 | |||||
14053 | // See if this is a redefinition. If 'will have body' (or similar) is already | ||||
14054 | // set, then these checks were already performed when it was set. | ||||
14055 | if (!FD->willHaveBody() && !FD->isLateTemplateParsed() && | ||||
14056 | !FD->isThisDeclarationInstantiatedFromAFriendDefinition()) { | ||||
14057 | CheckForFunctionRedefinition(FD, nullptr, SkipBody); | ||||
14058 | |||||
14059 | // If we're skipping the body, we're done. Don't enter the scope. | ||||
14060 | if (SkipBody && SkipBody->ShouldSkip) | ||||
14061 | return D; | ||||
14062 | } | ||||
14063 | |||||
14064 | // Mark this function as "will have a body eventually". This lets users to | ||||
14065 | // call e.g. isInlineDefinitionExternallyVisible while we're still parsing | ||||
14066 | // this function. | ||||
14067 | FD->setWillHaveBody(); | ||||
14068 | |||||
14069 | // If we are instantiating a generic lambda call operator, push | ||||
14070 | // a LambdaScopeInfo onto the function stack. But use the information | ||||
14071 | // that's already been calculated (ActOnLambdaExpr) to prime the current | ||||
14072 | // LambdaScopeInfo. | ||||
14073 | // When the template operator is being specialized, the LambdaScopeInfo, | ||||
14074 | // has to be properly restored so that tryCaptureVariable doesn't try | ||||
14075 | // and capture any new variables. In addition when calculating potential | ||||
14076 | // captures during transformation of nested lambdas, it is necessary to | ||||
14077 | // have the LSI properly restored. | ||||
14078 | if (isGenericLambdaCallOperatorSpecialization(FD)) { | ||||
14079 | assert(inTemplateInstantiation() &&((inTemplateInstantiation() && "There should be an active template instantiation on the stack " "when instantiating a generic lambda!") ? static_cast<void > (0) : __assert_fail ("inTemplateInstantiation() && \"There should be an active template instantiation on the stack \" \"when instantiating a generic lambda!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14081, __PRETTY_FUNCTION__)) | ||||
14080 | "There should be an active template instantiation on the stack "((inTemplateInstantiation() && "There should be an active template instantiation on the stack " "when instantiating a generic lambda!") ? static_cast<void > (0) : __assert_fail ("inTemplateInstantiation() && \"There should be an active template instantiation on the stack \" \"when instantiating a generic lambda!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14081, __PRETTY_FUNCTION__)) | ||||
14081 | "when instantiating a generic lambda!")((inTemplateInstantiation() && "There should be an active template instantiation on the stack " "when instantiating a generic lambda!") ? static_cast<void > (0) : __assert_fail ("inTemplateInstantiation() && \"There should be an active template instantiation on the stack \" \"when instantiating a generic lambda!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14081, __PRETTY_FUNCTION__)); | ||||
14082 | RebuildLambdaScopeInfo(cast<CXXMethodDecl>(D), *this); | ||||
14083 | } else { | ||||
14084 | // Enter a new function scope | ||||
14085 | PushFunctionScope(); | ||||
14086 | } | ||||
14087 | |||||
14088 | // Builtin functions cannot be defined. | ||||
14089 | if (unsigned BuiltinID = FD->getBuiltinID()) { | ||||
14090 | if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID) && | ||||
14091 | !Context.BuiltinInfo.isPredefinedRuntimeFunction(BuiltinID)) { | ||||
14092 | Diag(FD->getLocation(), diag::err_builtin_definition) << FD; | ||||
14093 | FD->setInvalidDecl(); | ||||
14094 | } | ||||
14095 | } | ||||
14096 | |||||
14097 | // The return type of a function definition must be complete | ||||
14098 | // (C99 6.9.1p3, C++ [dcl.fct]p6). | ||||
14099 | QualType ResultType = FD->getReturnType(); | ||||
14100 | if (!ResultType->isDependentType() && !ResultType->isVoidType() && | ||||
14101 | !FD->isInvalidDecl() && | ||||
14102 | RequireCompleteType(FD->getLocation(), ResultType, | ||||
14103 | diag::err_func_def_incomplete_result)) | ||||
14104 | FD->setInvalidDecl(); | ||||
14105 | |||||
14106 | if (FnBodyScope) | ||||
14107 | PushDeclContext(FnBodyScope, FD); | ||||
14108 | |||||
14109 | // Check the validity of our function parameters | ||||
14110 | CheckParmsForFunctionDef(FD->parameters(), | ||||
14111 | /*CheckParameterNames=*/true); | ||||
14112 | |||||
14113 | // Add non-parameter declarations already in the function to the current | ||||
14114 | // scope. | ||||
14115 | if (FnBodyScope) { | ||||
14116 | for (Decl *NPD : FD->decls()) { | ||||
14117 | auto *NonParmDecl = dyn_cast<NamedDecl>(NPD); | ||||
14118 | if (!NonParmDecl) | ||||
14119 | continue; | ||||
14120 | assert(!isa<ParmVarDecl>(NonParmDecl) &&((!isa<ParmVarDecl>(NonParmDecl) && "parameters should not be in newly created FD yet" ) ? static_cast<void> (0) : __assert_fail ("!isa<ParmVarDecl>(NonParmDecl) && \"parameters should not be in newly created FD yet\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14121, __PRETTY_FUNCTION__)) | ||||
14121 | "parameters should not be in newly created FD yet")((!isa<ParmVarDecl>(NonParmDecl) && "parameters should not be in newly created FD yet" ) ? static_cast<void> (0) : __assert_fail ("!isa<ParmVarDecl>(NonParmDecl) && \"parameters should not be in newly created FD yet\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14121, __PRETTY_FUNCTION__)); | ||||
14122 | |||||
14123 | // If the decl has a name, make it accessible in the current scope. | ||||
14124 | if (NonParmDecl->getDeclName()) | ||||
14125 | PushOnScopeChains(NonParmDecl, FnBodyScope, /*AddToContext=*/false); | ||||
14126 | |||||
14127 | // Similarly, dive into enums and fish their constants out, making them | ||||
14128 | // accessible in this scope. | ||||
14129 | if (auto *ED = dyn_cast<EnumDecl>(NonParmDecl)) { | ||||
14130 | for (auto *EI : ED->enumerators()) | ||||
14131 | PushOnScopeChains(EI, FnBodyScope, /*AddToContext=*/false); | ||||
14132 | } | ||||
14133 | } | ||||
14134 | } | ||||
14135 | |||||
14136 | // Introduce our parameters into the function scope | ||||
14137 | for (auto Param : FD->parameters()) { | ||||
14138 | Param->setOwningFunction(FD); | ||||
14139 | |||||
14140 | // If this has an identifier, add it to the scope stack. | ||||
14141 | if (Param->getIdentifier() && FnBodyScope) { | ||||
14142 | CheckShadow(FnBodyScope, Param); | ||||
14143 | |||||
14144 | PushOnScopeChains(Param, FnBodyScope); | ||||
14145 | } | ||||
14146 | } | ||||
14147 | |||||
14148 | // Ensure that the function's exception specification is instantiated. | ||||
14149 | if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>()) | ||||
14150 | ResolveExceptionSpec(D->getLocation(), FPT); | ||||
14151 | |||||
14152 | // dllimport cannot be applied to non-inline function definitions. | ||||
14153 | if (FD->hasAttr<DLLImportAttr>() && !FD->isInlined() && | ||||
14154 | !FD->isTemplateInstantiation()) { | ||||
14155 | assert(!FD->hasAttr<DLLExportAttr>())((!FD->hasAttr<DLLExportAttr>()) ? static_cast<void > (0) : __assert_fail ("!FD->hasAttr<DLLExportAttr>()" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14155, __PRETTY_FUNCTION__)); | ||||
14156 | Diag(FD->getLocation(), diag::err_attribute_dllimport_function_definition); | ||||
14157 | FD->setInvalidDecl(); | ||||
14158 | return D; | ||||
14159 | } | ||||
14160 | // We want to attach documentation to original Decl (which might be | ||||
14161 | // a function template). | ||||
14162 | ActOnDocumentableDecl(D); | ||||
14163 | if (getCurLexicalContext()->isObjCContainer() && | ||||
14164 | getCurLexicalContext()->getDeclKind() != Decl::ObjCCategoryImpl && | ||||
14165 | getCurLexicalContext()->getDeclKind() != Decl::ObjCImplementation) | ||||
14166 | Diag(FD->getLocation(), diag::warn_function_def_in_objc_container); | ||||
14167 | |||||
14168 | return D; | ||||
14169 | } | ||||
14170 | |||||
14171 | /// Given the set of return statements within a function body, | ||||
14172 | /// compute the variables that are subject to the named return value | ||||
14173 | /// optimization. | ||||
14174 | /// | ||||
14175 | /// Each of the variables that is subject to the named return value | ||||
14176 | /// optimization will be marked as NRVO variables in the AST, and any | ||||
14177 | /// return statement that has a marked NRVO variable as its NRVO candidate can | ||||
14178 | /// use the named return value optimization. | ||||
14179 | /// | ||||
14180 | /// This function applies a very simplistic algorithm for NRVO: if every return | ||||
14181 | /// statement in the scope of a variable has the same NRVO candidate, that | ||||
14182 | /// candidate is an NRVO variable. | ||||
14183 | void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { | ||||
14184 | ReturnStmt **Returns = Scope->Returns.data(); | ||||
14185 | |||||
14186 | for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { | ||||
14187 | if (const VarDecl *NRVOCandidate = Returns[I]->getNRVOCandidate()) { | ||||
14188 | if (!NRVOCandidate->isNRVOVariable()) | ||||
14189 | Returns[I]->setNRVOCandidate(nullptr); | ||||
14190 | } | ||||
14191 | } | ||||
14192 | } | ||||
14193 | |||||
14194 | bool Sema::canDelayFunctionBody(const Declarator &D) { | ||||
14195 | // We can't delay parsing the body of a constexpr function template (yet). | ||||
14196 | if (D.getDeclSpec().hasConstexprSpecifier()) | ||||
14197 | return false; | ||||
14198 | |||||
14199 | // We can't delay parsing the body of a function template with a deduced | ||||
14200 | // return type (yet). | ||||
14201 | if (D.getDeclSpec().hasAutoTypeSpec()) { | ||||
14202 | // If the placeholder introduces a non-deduced trailing return type, | ||||
14203 | // we can still delay parsing it. | ||||
14204 | if (D.getNumTypeObjects()) { | ||||
14205 | const auto &Outer = D.getTypeObject(D.getNumTypeObjects() - 1); | ||||
14206 | if (Outer.Kind == DeclaratorChunk::Function && | ||||
14207 | Outer.Fun.hasTrailingReturnType()) { | ||||
14208 | QualType Ty = GetTypeFromParser(Outer.Fun.getTrailingReturnType()); | ||||
14209 | return Ty.isNull() || !Ty->isUndeducedType(); | ||||
14210 | } | ||||
14211 | } | ||||
14212 | return false; | ||||
14213 | } | ||||
14214 | |||||
14215 | return true; | ||||
14216 | } | ||||
14217 | |||||
14218 | bool Sema::canSkipFunctionBody(Decl *D) { | ||||
14219 | // We cannot skip the body of a function (or function template) which is | ||||
14220 | // constexpr, since we may need to evaluate its body in order to parse the | ||||
14221 | // rest of the file. | ||||
14222 | // We cannot skip the body of a function with an undeduced return type, | ||||
14223 | // because any callers of that function need to know the type. | ||||
14224 | if (const FunctionDecl *FD = D->getAsFunction()) { | ||||
14225 | if (FD->isConstexpr()) | ||||
14226 | return false; | ||||
14227 | // We can't simply call Type::isUndeducedType here, because inside template | ||||
14228 | // auto can be deduced to a dependent type, which is not considered | ||||
14229 | // "undeduced". | ||||
14230 | if (FD->getReturnType()->getContainedDeducedType()) | ||||
14231 | return false; | ||||
14232 | } | ||||
14233 | return Consumer.shouldSkipFunctionBody(D); | ||||
14234 | } | ||||
14235 | |||||
14236 | Decl *Sema::ActOnSkippedFunctionBody(Decl *Decl) { | ||||
14237 | if (!Decl) | ||||
14238 | return nullptr; | ||||
14239 | if (FunctionDecl *FD = Decl->getAsFunction()) | ||||
14240 | FD->setHasSkippedBody(); | ||||
14241 | else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(Decl)) | ||||
14242 | MD->setHasSkippedBody(); | ||||
14243 | return Decl; | ||||
14244 | } | ||||
14245 | |||||
14246 | Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { | ||||
14247 | return ActOnFinishFunctionBody(D, BodyArg, false); | ||||
14248 | } | ||||
14249 | |||||
14250 | /// RAII object that pops an ExpressionEvaluationContext when exiting a function | ||||
14251 | /// body. | ||||
14252 | class ExitFunctionBodyRAII { | ||||
14253 | public: | ||||
14254 | ExitFunctionBodyRAII(Sema &S, bool IsLambda) : S(S), IsLambda(IsLambda) {} | ||||
14255 | ~ExitFunctionBodyRAII() { | ||||
14256 | if (!IsLambda) | ||||
14257 | S.PopExpressionEvaluationContext(); | ||||
14258 | } | ||||
14259 | |||||
14260 | private: | ||||
14261 | Sema &S; | ||||
14262 | bool IsLambda = false; | ||||
14263 | }; | ||||
14264 | |||||
14265 | static void diagnoseImplicitlyRetainedSelf(Sema &S) { | ||||
14266 | llvm::DenseMap<const BlockDecl *, bool> EscapeInfo; | ||||
14267 | |||||
14268 | auto IsOrNestedInEscapingBlock = [&](const BlockDecl *BD) { | ||||
14269 | if (EscapeInfo.count(BD)) | ||||
14270 | return EscapeInfo[BD]; | ||||
14271 | |||||
14272 | bool R = false; | ||||
14273 | const BlockDecl *CurBD = BD; | ||||
14274 | |||||
14275 | do { | ||||
14276 | R = !CurBD->doesNotEscape(); | ||||
14277 | if (R) | ||||
14278 | break; | ||||
14279 | CurBD = CurBD->getParent()->getInnermostBlockDecl(); | ||||
14280 | } while (CurBD); | ||||
14281 | |||||
14282 | return EscapeInfo[BD] = R; | ||||
14283 | }; | ||||
14284 | |||||
14285 | // If the location where 'self' is implicitly retained is inside a escaping | ||||
14286 | // block, emit a diagnostic. | ||||
14287 | for (const std::pair<SourceLocation, const BlockDecl *> &P : | ||||
14288 | S.ImplicitlyRetainedSelfLocs) | ||||
14289 | if (IsOrNestedInEscapingBlock(P.second)) | ||||
14290 | S.Diag(P.first, diag::warn_implicitly_retains_self) | ||||
14291 | << FixItHint::CreateInsertion(P.first, "self->"); | ||||
14292 | } | ||||
14293 | |||||
14294 | Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, | ||||
14295 | bool IsInstantiation) { | ||||
14296 | FunctionScopeInfo *FSI = getCurFunction(); | ||||
14297 | FunctionDecl *FD = dcl ? dcl->getAsFunction() : nullptr; | ||||
14298 | |||||
14299 | if (FSI->UsesFPIntrin && !FD->hasAttr<StrictFPAttr>()) | ||||
14300 | FD->addAttr(StrictFPAttr::CreateImplicit(Context)); | ||||
14301 | |||||
14302 | sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); | ||||
14303 | sema::AnalysisBasedWarnings::Policy *ActivePolicy = nullptr; | ||||
14304 | |||||
14305 | if (getLangOpts().Coroutines && FSI->isCoroutine()) | ||||
14306 | CheckCompletedCoroutineBody(FD, Body); | ||||
14307 | |||||
14308 | // Do not call PopExpressionEvaluationContext() if it is a lambda because one | ||||
14309 | // is already popped when finishing the lambda in BuildLambdaExpr(). This is | ||||
14310 | // meant to pop the context added in ActOnStartOfFunctionDef(). | ||||
14311 | ExitFunctionBodyRAII ExitRAII(*this, isLambdaCallOperator(FD)); | ||||
14312 | |||||
14313 | if (FD) { | ||||
14314 | FD->setBody(Body); | ||||
14315 | FD->setWillHaveBody(false); | ||||
14316 | |||||
14317 | if (getLangOpts().CPlusPlus14) { | ||||
14318 | if (!FD->isInvalidDecl() && Body && !FD->isDependentContext() && | ||||
14319 | FD->getReturnType()->isUndeducedType()) { | ||||
14320 | // If the function has a deduced result type but contains no 'return' | ||||
14321 | // statements, the result type as written must be exactly 'auto', and | ||||
14322 | // the deduced result type is 'void'. | ||||
14323 | if (!FD->getReturnType()->getAs<AutoType>()) { | ||||
14324 | Diag(dcl->getLocation(), diag::err_auto_fn_no_return_but_not_auto) | ||||
14325 | << FD->getReturnType(); | ||||
14326 | FD->setInvalidDecl(); | ||||
14327 | } else { | ||||
14328 | // Substitute 'void' for the 'auto' in the type. | ||||
14329 | TypeLoc ResultType = getReturnTypeLoc(FD); | ||||
14330 | Context.adjustDeducedFunctionResultType( | ||||
14331 | FD, SubstAutoType(ResultType.getType(), Context.VoidTy)); | ||||
14332 | } | ||||
14333 | } | ||||
14334 | } else if (getLangOpts().CPlusPlus11 && isLambdaCallOperator(FD)) { | ||||
14335 | // In C++11, we don't use 'auto' deduction rules for lambda call | ||||
14336 | // operators because we don't support return type deduction. | ||||
14337 | auto *LSI = getCurLambda(); | ||||
14338 | if (LSI->HasImplicitReturnType) { | ||||
14339 | deduceClosureReturnType(*LSI); | ||||
14340 | |||||
14341 | // C++11 [expr.prim.lambda]p4: | ||||
14342 | // [...] if there are no return statements in the compound-statement | ||||
14343 | // [the deduced type is] the type void | ||||
14344 | QualType RetType = | ||||
14345 | LSI->ReturnType.isNull() ? Context.VoidTy : LSI->ReturnType; | ||||
14346 | |||||
14347 | // Update the return type to the deduced type. | ||||
14348 | const auto *Proto = FD->getType()->castAs<FunctionProtoType>(); | ||||
14349 | FD->setType(Context.getFunctionType(RetType, Proto->getParamTypes(), | ||||
14350 | Proto->getExtProtoInfo())); | ||||
14351 | } | ||||
14352 | } | ||||
14353 | |||||
14354 | // If the function implicitly returns zero (like 'main') or is naked, | ||||
14355 | // don't complain about missing return statements. | ||||
14356 | if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) | ||||
14357 | WP.disableCheckFallThrough(); | ||||
14358 | |||||
14359 | // MSVC permits the use of pure specifier (=0) on function definition, | ||||
14360 | // defined at class scope, warn about this non-standard construct. | ||||
14361 | if (getLangOpts().MicrosoftExt && FD->isPure() && !FD->isOutOfLine()) | ||||
14362 | Diag(FD->getLocation(), diag::ext_pure_function_definition); | ||||
14363 | |||||
14364 | if (!FD->isInvalidDecl()) { | ||||
14365 | // Don't diagnose unused parameters of defaulted or deleted functions. | ||||
14366 | if (!FD->isDeleted() && !FD->isDefaulted() && !FD->hasSkippedBody()) | ||||
14367 | DiagnoseUnusedParameters(FD->parameters()); | ||||
14368 | DiagnoseSizeOfParametersAndReturnValue(FD->parameters(), | ||||
14369 | FD->getReturnType(), FD); | ||||
14370 | |||||
14371 | // If this is a structor, we need a vtable. | ||||
14372 | if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) | ||||
14373 | MarkVTableUsed(FD->getLocation(), Constructor->getParent()); | ||||
14374 | else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(FD)) | ||||
14375 | MarkVTableUsed(FD->getLocation(), Destructor->getParent()); | ||||
14376 | |||||
14377 | // Try to apply the named return value optimization. We have to check | ||||
14378 | // if we can do this here because lambdas keep return statements around | ||||
14379 | // to deduce an implicit return type. | ||||
14380 | if (FD->getReturnType()->isRecordType() && | ||||
14381 | (!getLangOpts().CPlusPlus || !FD->isDependentContext())) | ||||
14382 | computeNRVO(Body, FSI); | ||||
14383 | } | ||||
14384 | |||||
14385 | // GNU warning -Wmissing-prototypes: | ||||
14386 | // Warn if a global function is defined without a previous | ||||
14387 | // prototype declaration. This warning is issued even if the | ||||
14388 | // definition itself provides a prototype. The aim is to detect | ||||
14389 | // global functions that fail to be declared in header files. | ||||
14390 | const FunctionDecl *PossiblePrototype = nullptr; | ||||
14391 | if (ShouldWarnAboutMissingPrototype(FD, PossiblePrototype)) { | ||||
14392 | Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; | ||||
14393 | |||||
14394 | if (PossiblePrototype) { | ||||
14395 | // We found a declaration that is not a prototype, | ||||
14396 | // but that could be a zero-parameter prototype | ||||
14397 | if (TypeSourceInfo *TI = PossiblePrototype->getTypeSourceInfo()) { | ||||
14398 | TypeLoc TL = TI->getTypeLoc(); | ||||
14399 | if (FunctionNoProtoTypeLoc FTL = TL.getAs<FunctionNoProtoTypeLoc>()) | ||||
14400 | Diag(PossiblePrototype->getLocation(), | ||||
14401 | diag::note_declaration_not_a_prototype) | ||||
14402 | << (FD->getNumParams() != 0) | ||||
14403 | << (FD->getNumParams() == 0 | ||||
14404 | ? FixItHint::CreateInsertion(FTL.getRParenLoc(), "void") | ||||
14405 | : FixItHint{}); | ||||
14406 | } | ||||
14407 | } else { | ||||
14408 | // Returns true if the token beginning at this Loc is `const`. | ||||
14409 | auto isLocAtConst = [&](SourceLocation Loc, const SourceManager &SM, | ||||
14410 | const LangOptions &LangOpts) { | ||||
14411 | std::pair<FileID, unsigned> LocInfo = SM.getDecomposedLoc(Loc); | ||||
14412 | if (LocInfo.first.isInvalid()) | ||||
14413 | return false; | ||||
14414 | |||||
14415 | bool Invalid = false; | ||||
14416 | StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); | ||||
14417 | if (Invalid) | ||||
14418 | return false; | ||||
14419 | |||||
14420 | if (LocInfo.second > Buffer.size()) | ||||
14421 | return false; | ||||
14422 | |||||
14423 | const char *LexStart = Buffer.data() + LocInfo.second; | ||||
14424 | StringRef StartTok(LexStart, Buffer.size() - LocInfo.second); | ||||
14425 | |||||
14426 | return StartTok.consume_front("const") && | ||||
14427 | (StartTok.empty() || isWhitespace(StartTok[0]) || | ||||
14428 | StartTok.startswith("/*") || StartTok.startswith("//")); | ||||
14429 | }; | ||||
14430 | |||||
14431 | auto findBeginLoc = [&]() { | ||||
14432 | // If the return type has `const` qualifier, we want to insert | ||||
14433 | // `static` before `const` (and not before the typename). | ||||
14434 | if ((FD->getReturnType()->isAnyPointerType() && | ||||
14435 | FD->getReturnType()->getPointeeType().isConstQualified()) || | ||||
14436 | FD->getReturnType().isConstQualified()) { | ||||
14437 | // But only do this if we can determine where the `const` is. | ||||
14438 | |||||
14439 | if (isLocAtConst(FD->getBeginLoc(), getSourceManager(), | ||||
14440 | getLangOpts())) | ||||
14441 | |||||
14442 | return FD->getBeginLoc(); | ||||
14443 | } | ||||
14444 | return FD->getTypeSpecStartLoc(); | ||||
14445 | }; | ||||
14446 | Diag(FD->getTypeSpecStartLoc(), diag::note_static_for_internal_linkage) | ||||
14447 | << /* function */ 1 | ||||
14448 | << (FD->getStorageClass() == SC_None | ||||
14449 | ? FixItHint::CreateInsertion(findBeginLoc(), "static ") | ||||
14450 | : FixItHint{}); | ||||
14451 | } | ||||
14452 | |||||
14453 | // GNU warning -Wstrict-prototypes | ||||
14454 | // Warn if K&R function is defined without a previous declaration. | ||||
14455 | // This warning is issued only if the definition itself does not provide | ||||
14456 | // a prototype. Only K&R definitions do not provide a prototype. | ||||
14457 | if (!FD->hasWrittenPrototype()) { | ||||
14458 | TypeSourceInfo *TI = FD->getTypeSourceInfo(); | ||||
14459 | TypeLoc TL = TI->getTypeLoc(); | ||||
14460 | FunctionTypeLoc FTL = TL.getAsAdjusted<FunctionTypeLoc>(); | ||||
14461 | Diag(FTL.getLParenLoc(), diag::warn_strict_prototypes) << 2; | ||||
14462 | } | ||||
14463 | } | ||||
14464 | |||||
14465 | // Warn on CPUDispatch with an actual body. | ||||
14466 | if (FD->isMultiVersion() && FD->hasAttr<CPUDispatchAttr>() && Body) | ||||
14467 | if (const auto *CmpndBody = dyn_cast<CompoundStmt>(Body)) | ||||
14468 | if (!CmpndBody->body_empty()) | ||||
14469 | Diag(CmpndBody->body_front()->getBeginLoc(), | ||||
14470 | diag::warn_dispatch_body_ignored); | ||||
14471 | |||||
14472 | if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) { | ||||
14473 | const CXXMethodDecl *KeyFunction; | ||||
14474 | if (MD->isOutOfLine() && (MD = MD->getCanonicalDecl()) && | ||||
14475 | MD->isVirtual() && | ||||
14476 | (KeyFunction = Context.getCurrentKeyFunction(MD->getParent())) && | ||||
14477 | MD == KeyFunction->getCanonicalDecl()) { | ||||
14478 | // Update the key-function state if necessary for this ABI. | ||||
14479 | if (FD->isInlined() && | ||||
14480 | !Context.getTargetInfo().getCXXABI().canKeyFunctionBeInline()) { | ||||
14481 | Context.setNonKeyFunction(MD); | ||||
14482 | |||||
14483 | // If the newly-chosen key function is already defined, then we | ||||
14484 | // need to mark the vtable as used retroactively. | ||||
14485 | KeyFunction = Context.getCurrentKeyFunction(MD->getParent()); | ||||
14486 | const FunctionDecl *Definition; | ||||
14487 | if (KeyFunction && KeyFunction->isDefined(Definition)) | ||||
14488 | MarkVTableUsed(Definition->getLocation(), MD->getParent(), true); | ||||
14489 | } else { | ||||
14490 | // We just defined they key function; mark the vtable as used. | ||||
14491 | MarkVTableUsed(FD->getLocation(), MD->getParent(), true); | ||||
14492 | } | ||||
14493 | } | ||||
14494 | } | ||||
14495 | |||||
14496 | assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) &&(((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && "Function parsing confused") ? static_cast <void> (0) : __assert_fail ("(FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && \"Function parsing confused\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14497, __PRETTY_FUNCTION__)) | ||||
14497 | "Function parsing confused")(((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && "Function parsing confused") ? static_cast <void> (0) : __assert_fail ("(FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && \"Function parsing confused\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14497, __PRETTY_FUNCTION__)); | ||||
14498 | } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { | ||||
14499 | assert(MD == getCurMethodDecl() && "Method parsing confused")((MD == getCurMethodDecl() && "Method parsing confused" ) ? static_cast<void> (0) : __assert_fail ("MD == getCurMethodDecl() && \"Method parsing confused\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14499, __PRETTY_FUNCTION__)); | ||||
14500 | MD->setBody(Body); | ||||
14501 | if (!MD->isInvalidDecl()) { | ||||
14502 | DiagnoseSizeOfParametersAndReturnValue(MD->parameters(), | ||||
14503 | MD->getReturnType(), MD); | ||||
14504 | |||||
14505 | if (Body) | ||||
14506 | computeNRVO(Body, FSI); | ||||
14507 | } | ||||
14508 | if (FSI->ObjCShouldCallSuper) { | ||||
14509 | Diag(MD->getEndLoc(), diag::warn_objc_missing_super_call) | ||||
14510 | << MD->getSelector().getAsString(); | ||||
14511 | FSI->ObjCShouldCallSuper = false; | ||||
14512 | } | ||||
14513 | if (FSI->ObjCWarnForNoDesignatedInitChain) { | ||||
14514 | const ObjCMethodDecl *InitMethod = nullptr; | ||||
14515 | bool isDesignated = | ||||
14516 | MD->isDesignatedInitializerForTheInterface(&InitMethod); | ||||
14517 | assert(isDesignated && InitMethod)((isDesignated && InitMethod) ? static_cast<void> (0) : __assert_fail ("isDesignated && InitMethod", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14517, __PRETTY_FUNCTION__)); | ||||
14518 | (void)isDesignated; | ||||
14519 | |||||
14520 | auto superIsNSObject = [&](const ObjCMethodDecl *MD) { | ||||
14521 | auto IFace = MD->getClassInterface(); | ||||
14522 | if (!IFace) | ||||
14523 | return false; | ||||
14524 | auto SuperD = IFace->getSuperClass(); | ||||
14525 | if (!SuperD) | ||||
14526 | return false; | ||||
14527 | return SuperD->getIdentifier() == | ||||
14528 | NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject); | ||||
14529 | }; | ||||
14530 | // Don't issue this warning for unavailable inits or direct subclasses | ||||
14531 | // of NSObject. | ||||
14532 | if (!MD->isUnavailable() && !superIsNSObject(MD)) { | ||||
14533 | Diag(MD->getLocation(), | ||||
14534 | diag::warn_objc_designated_init_missing_super_call); | ||||
14535 | Diag(InitMethod->getLocation(), | ||||
14536 | diag::note_objc_designated_init_marked_here); | ||||
14537 | } | ||||
14538 | FSI->ObjCWarnForNoDesignatedInitChain = false; | ||||
14539 | } | ||||
14540 | if (FSI->ObjCWarnForNoInitDelegation) { | ||||
14541 | // Don't issue this warning for unavaialable inits. | ||||
14542 | if (!MD->isUnavailable()) | ||||
14543 | Diag(MD->getLocation(), | ||||
14544 | diag::warn_objc_secondary_init_missing_init_call); | ||||
14545 | FSI->ObjCWarnForNoInitDelegation = false; | ||||
14546 | } | ||||
14547 | |||||
14548 | diagnoseImplicitlyRetainedSelf(*this); | ||||
14549 | } else { | ||||
14550 | // Parsing the function declaration failed in some way. Pop the fake scope | ||||
14551 | // we pushed on. | ||||
14552 | PopFunctionScopeInfo(ActivePolicy, dcl); | ||||
14553 | return nullptr; | ||||
14554 | } | ||||
14555 | |||||
14556 | if (Body && FSI->HasPotentialAvailabilityViolations) | ||||
14557 | DiagnoseUnguardedAvailabilityViolations(dcl); | ||||
14558 | |||||
14559 | assert(!FSI->ObjCShouldCallSuper &&((!FSI->ObjCShouldCallSuper && "This should only be set for ObjC methods, which should have been " "handled in the block above.") ? static_cast<void> (0) : __assert_fail ("!FSI->ObjCShouldCallSuper && \"This should only be set for ObjC methods, which should have been \" \"handled in the block above.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14561, __PRETTY_FUNCTION__)) | ||||
14560 | "This should only be set for ObjC methods, which should have been "((!FSI->ObjCShouldCallSuper && "This should only be set for ObjC methods, which should have been " "handled in the block above.") ? static_cast<void> (0) : __assert_fail ("!FSI->ObjCShouldCallSuper && \"This should only be set for ObjC methods, which should have been \" \"handled in the block above.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14561, __PRETTY_FUNCTION__)) | ||||
14561 | "handled in the block above.")((!FSI->ObjCShouldCallSuper && "This should only be set for ObjC methods, which should have been " "handled in the block above.") ? static_cast<void> (0) : __assert_fail ("!FSI->ObjCShouldCallSuper && \"This should only be set for ObjC methods, which should have been \" \"handled in the block above.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14561, __PRETTY_FUNCTION__)); | ||||
14562 | |||||
14563 | // Verify and clean out per-function state. | ||||
14564 | if (Body && (!FD || !FD->isDefaulted())) { | ||||
14565 | // C++ constructors that have function-try-blocks can't have return | ||||
14566 | // statements in the handlers of that block. (C++ [except.handle]p14) | ||||
14567 | // Verify this. | ||||
14568 | if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) | ||||
14569 | DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); | ||||
14570 | |||||
14571 | // Verify that gotos and switch cases don't jump into scopes illegally. | ||||
14572 | if (FSI->NeedsScopeChecking() && | ||||
14573 | !PP.isCodeCompletionEnabled()) | ||||
14574 | DiagnoseInvalidJumps(Body); | ||||
14575 | |||||
14576 | if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { | ||||
14577 | if (!Destructor->getParent()->isDependentType()) | ||||
14578 | CheckDestructor(Destructor); | ||||
14579 | |||||
14580 | MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), | ||||
14581 | Destructor->getParent()); | ||||
14582 | } | ||||
14583 | |||||
14584 | // If any errors have occurred, clear out any temporaries that may have | ||||
14585 | // been leftover. This ensures that these temporaries won't be picked up for | ||||
14586 | // deletion in some later function. | ||||
14587 | if (hasUncompilableErrorOccurred() || | ||||
14588 | getDiagnostics().getSuppressAllDiagnostics()) { | ||||
14589 | DiscardCleanupsInEvaluationContext(); | ||||
14590 | } | ||||
14591 | if (!hasUncompilableErrorOccurred() && | ||||
14592 | !isa<FunctionTemplateDecl>(dcl)) { | ||||
14593 | // Since the body is valid, issue any analysis-based warnings that are | ||||
14594 | // enabled. | ||||
14595 | ActivePolicy = &WP; | ||||
14596 | } | ||||
14597 | |||||
14598 | if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && | ||||
14599 | !CheckConstexprFunctionDefinition(FD, CheckConstexprKind::Diagnose)) | ||||
14600 | FD->setInvalidDecl(); | ||||
14601 | |||||
14602 | if (FD && FD->hasAttr<NakedAttr>()) { | ||||
14603 | for (const Stmt *S : Body->children()) { | ||||
14604 | // Allow local register variables without initializer as they don't | ||||
14605 | // require prologue. | ||||
14606 | bool RegisterVariables = false; | ||||
14607 | if (auto *DS = dyn_cast<DeclStmt>(S)) { | ||||
14608 | for (const auto *Decl : DS->decls()) { | ||||
14609 | if (const auto *Var = dyn_cast<VarDecl>(Decl)) { | ||||
14610 | RegisterVariables = | ||||
14611 | Var->hasAttr<AsmLabelAttr>() && !Var->hasInit(); | ||||
14612 | if (!RegisterVariables) | ||||
14613 | break; | ||||
14614 | } | ||||
14615 | } | ||||
14616 | } | ||||
14617 | if (RegisterVariables) | ||||
14618 | continue; | ||||
14619 | if (!isa<AsmStmt>(S) && !isa<NullStmt>(S)) { | ||||
14620 | Diag(S->getBeginLoc(), diag::err_non_asm_stmt_in_naked_function); | ||||
14621 | Diag(FD->getAttr<NakedAttr>()->getLocation(), diag::note_attribute); | ||||
14622 | FD->setInvalidDecl(); | ||||
14623 | break; | ||||
14624 | } | ||||
14625 | } | ||||
14626 | } | ||||
14627 | |||||
14628 | assert(ExprCleanupObjects.size() ==((ExprCleanupObjects.size() == ExprEvalContexts.back().NumCleanupObjects && "Leftover temporaries in function") ? static_cast <void> (0) : __assert_fail ("ExprCleanupObjects.size() == ExprEvalContexts.back().NumCleanupObjects && \"Leftover temporaries in function\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14630, __PRETTY_FUNCTION__)) | ||||
14629 | ExprEvalContexts.back().NumCleanupObjects &&((ExprCleanupObjects.size() == ExprEvalContexts.back().NumCleanupObjects && "Leftover temporaries in function") ? static_cast <void> (0) : __assert_fail ("ExprCleanupObjects.size() == ExprEvalContexts.back().NumCleanupObjects && \"Leftover temporaries in function\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14630, __PRETTY_FUNCTION__)) | ||||
14630 | "Leftover temporaries in function")((ExprCleanupObjects.size() == ExprEvalContexts.back().NumCleanupObjects && "Leftover temporaries in function") ? static_cast <void> (0) : __assert_fail ("ExprCleanupObjects.size() == ExprEvalContexts.back().NumCleanupObjects && \"Leftover temporaries in function\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14630, __PRETTY_FUNCTION__)); | ||||
14631 | assert(!Cleanup.exprNeedsCleanups() && "Unaccounted cleanups in function")((!Cleanup.exprNeedsCleanups() && "Unaccounted cleanups in function" ) ? static_cast<void> (0) : __assert_fail ("!Cleanup.exprNeedsCleanups() && \"Unaccounted cleanups in function\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14631, __PRETTY_FUNCTION__)); | ||||
14632 | assert(MaybeODRUseExprs.empty() &&((MaybeODRUseExprs.empty() && "Leftover expressions for odr-use checking" ) ? static_cast<void> (0) : __assert_fail ("MaybeODRUseExprs.empty() && \"Leftover expressions for odr-use checking\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14633, __PRETTY_FUNCTION__)) | ||||
14633 | "Leftover expressions for odr-use checking")((MaybeODRUseExprs.empty() && "Leftover expressions for odr-use checking" ) ? static_cast<void> (0) : __assert_fail ("MaybeODRUseExprs.empty() && \"Leftover expressions for odr-use checking\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14633, __PRETTY_FUNCTION__)); | ||||
14634 | } | ||||
14635 | |||||
14636 | if (!IsInstantiation) | ||||
14637 | PopDeclContext(); | ||||
14638 | |||||
14639 | PopFunctionScopeInfo(ActivePolicy, dcl); | ||||
14640 | // If any errors have occurred, clear out any temporaries that may have | ||||
14641 | // been leftover. This ensures that these temporaries won't be picked up for | ||||
14642 | // deletion in some later function. | ||||
14643 | if (hasUncompilableErrorOccurred()) { | ||||
14644 | DiscardCleanupsInEvaluationContext(); | ||||
14645 | } | ||||
14646 | |||||
14647 | if (FD && (LangOpts.OpenMP || LangOpts.CUDA || LangOpts.SYCLIsDevice)) { | ||||
14648 | auto ES = getEmissionStatus(FD); | ||||
14649 | if (ES == Sema::FunctionEmissionStatus::Emitted || | ||||
14650 | ES == Sema::FunctionEmissionStatus::Unknown) | ||||
14651 | DeclsToCheckForDeferredDiags.push_back(FD); | ||||
14652 | } | ||||
14653 | |||||
14654 | return dcl; | ||||
14655 | } | ||||
14656 | |||||
14657 | /// When we finish delayed parsing of an attribute, we must attach it to the | ||||
14658 | /// relevant Decl. | ||||
14659 | void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, | ||||
14660 | ParsedAttributes &Attrs) { | ||||
14661 | // Always attach attributes to the underlying decl. | ||||
14662 | if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) | ||||
14663 | D = TD->getTemplatedDecl(); | ||||
14664 | ProcessDeclAttributeList(S, D, Attrs); | ||||
14665 | |||||
14666 | if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D)) | ||||
14667 | if (Method->isStatic()) | ||||
14668 | checkThisInStaticMemberFunctionAttributes(Method); | ||||
14669 | } | ||||
14670 | |||||
14671 | /// ImplicitlyDefineFunction - An undeclared identifier was used in a function | ||||
14672 | /// call, forming a call to an implicitly defined function (per C99 6.5.1p2). | ||||
14673 | NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, | ||||
14674 | IdentifierInfo &II, Scope *S) { | ||||
14675 | // Find the scope in which the identifier is injected and the corresponding | ||||
14676 | // DeclContext. | ||||
14677 | // FIXME: C89 does not say what happens if there is no enclosing block scope. | ||||
14678 | // In that case, we inject the declaration into the translation unit scope | ||||
14679 | // instead. | ||||
14680 | Scope *BlockScope = S; | ||||
14681 | while (!BlockScope->isCompoundStmtScope() && BlockScope->getParent()) | ||||
14682 | BlockScope = BlockScope->getParent(); | ||||
14683 | |||||
14684 | Scope *ContextScope = BlockScope; | ||||
14685 | while (!ContextScope->getEntity()) | ||||
14686 | ContextScope = ContextScope->getParent(); | ||||
14687 | ContextRAII SavedContext(*this, ContextScope->getEntity()); | ||||
14688 | |||||
14689 | // Before we produce a declaration for an implicitly defined | ||||
14690 | // function, see whether there was a locally-scoped declaration of | ||||
14691 | // this name as a function or variable. If so, use that | ||||
14692 | // (non-visible) declaration, and complain about it. | ||||
14693 | NamedDecl *ExternCPrev = findLocallyScopedExternCDecl(&II); | ||||
14694 | if (ExternCPrev) { | ||||
14695 | // We still need to inject the function into the enclosing block scope so | ||||
14696 | // that later (non-call) uses can see it. | ||||
14697 | PushOnScopeChains(ExternCPrev, BlockScope, /*AddToContext*/false); | ||||
14698 | |||||
14699 | // C89 footnote 38: | ||||
14700 | // If in fact it is not defined as having type "function returning int", | ||||
14701 | // the behavior is undefined. | ||||
14702 | if (!isa<FunctionDecl>(ExternCPrev) || | ||||
14703 | !Context.typesAreCompatible( | ||||
14704 | cast<FunctionDecl>(ExternCPrev)->getType(), | ||||
14705 | Context.getFunctionNoProtoType(Context.IntTy))) { | ||||
14706 | Diag(Loc, diag::ext_use_out_of_scope_declaration) | ||||
14707 | << ExternCPrev << !getLangOpts().C99; | ||||
14708 | Diag(ExternCPrev->getLocation(), diag::note_previous_declaration); | ||||
14709 | return ExternCPrev; | ||||
14710 | } | ||||
14711 | } | ||||
14712 | |||||
14713 | // Extension in C99. Legal in C90, but warn about it. | ||||
14714 | unsigned diag_id; | ||||
14715 | if (II.getName().startswith("__builtin_")) | ||||
14716 | diag_id = diag::warn_builtin_unknown; | ||||
14717 | // OpenCL v2.0 s6.9.u - Implicit function declaration is not supported. | ||||
14718 | else if (getLangOpts().OpenCL) | ||||
14719 | diag_id = diag::err_opencl_implicit_function_decl; | ||||
14720 | else if (getLangOpts().C99) | ||||
14721 | diag_id = diag::ext_implicit_function_decl; | ||||
14722 | else | ||||
14723 | diag_id = diag::warn_implicit_function_decl; | ||||
14724 | Diag(Loc, diag_id) << &II; | ||||
14725 | |||||
14726 | // If we found a prior declaration of this function, don't bother building | ||||
14727 | // another one. We've already pushed that one into scope, so there's nothing | ||||
14728 | // more to do. | ||||
14729 | if (ExternCPrev) | ||||
14730 | return ExternCPrev; | ||||
14731 | |||||
14732 | // Because typo correction is expensive, only do it if the implicit | ||||
14733 | // function declaration is going to be treated as an error. | ||||
14734 | if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { | ||||
14735 | TypoCorrection Corrected; | ||||
14736 | DeclFilterCCC<FunctionDecl> CCC{}; | ||||
14737 | if (S && (Corrected = | ||||
14738 | CorrectTypo(DeclarationNameInfo(&II, Loc), LookupOrdinaryName, | ||||
14739 | S, nullptr, CCC, CTK_NonError))) | ||||
14740 | diagnoseTypo(Corrected, PDiag(diag::note_function_suggestion), | ||||
14741 | /*ErrorRecovery*/false); | ||||
14742 | } | ||||
14743 | |||||
14744 | // Set a Declarator for the implicit definition: int foo(); | ||||
14745 | const char *Dummy; | ||||
14746 | AttributeFactory attrFactory; | ||||
14747 | DeclSpec DS(attrFactory); | ||||
14748 | unsigned DiagID; | ||||
14749 | bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID, | ||||
14750 | Context.getPrintingPolicy()); | ||||
14751 | (void)Error; // Silence warning. | ||||
14752 | assert(!Error && "Error setting up implicit decl!")((!Error && "Error setting up implicit decl!") ? static_cast <void> (0) : __assert_fail ("!Error && \"Error setting up implicit decl!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 14752, __PRETTY_FUNCTION__)); | ||||
14753 | SourceLocation NoLoc; | ||||
14754 | Declarator D(DS, DeclaratorContext::Block); | ||||
14755 | D.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/false, | ||||
14756 | /*IsAmbiguous=*/false, | ||||
14757 | /*LParenLoc=*/NoLoc, | ||||
14758 | /*Params=*/nullptr, | ||||
14759 | /*NumParams=*/0, | ||||
14760 | /*EllipsisLoc=*/NoLoc, | ||||
14761 | /*RParenLoc=*/NoLoc, | ||||
14762 | /*RefQualifierIsLvalueRef=*/true, | ||||
14763 | /*RefQualifierLoc=*/NoLoc, | ||||
14764 | /*MutableLoc=*/NoLoc, EST_None, | ||||
14765 | /*ESpecRange=*/SourceRange(), | ||||
14766 | /*Exceptions=*/nullptr, | ||||
14767 | /*ExceptionRanges=*/nullptr, | ||||
14768 | /*NumExceptions=*/0, | ||||
14769 | /*NoexceptExpr=*/nullptr, | ||||
14770 | /*ExceptionSpecTokens=*/nullptr, | ||||
14771 | /*DeclsInPrototype=*/None, Loc, | ||||
14772 | Loc, D), | ||||
14773 | std::move(DS.getAttributes()), SourceLocation()); | ||||
14774 | D.SetIdentifier(&II, Loc); | ||||
14775 | |||||
14776 | // Insert this function into the enclosing block scope. | ||||
14777 | FunctionDecl *FD = cast<FunctionDecl>(ActOnDeclarator(BlockScope, D)); | ||||
14778 | FD->setImplicit(); | ||||
14779 | |||||
14780 | AddKnownFunctionAttributes(FD); | ||||
14781 | |||||
14782 | return FD; | ||||
14783 | } | ||||
14784 | |||||
14785 | /// If this function is a C++ replaceable global allocation function | ||||
14786 | /// (C++2a [basic.stc.dynamic.allocation], C++2a [new.delete]), | ||||
14787 | /// adds any function attributes that we know a priori based on the standard. | ||||
14788 | /// | ||||
14789 | /// We need to check for duplicate attributes both here and where user-written | ||||
14790 | /// attributes are applied to declarations. | ||||
14791 | void Sema::AddKnownFunctionAttributesForReplaceableGlobalAllocationFunction( | ||||
14792 | FunctionDecl *FD) { | ||||
14793 | if (FD->isInvalidDecl()) | ||||
14794 | return; | ||||
14795 | |||||
14796 | if (FD->getDeclName().getCXXOverloadedOperator() != OO_New && | ||||
14797 | FD->getDeclName().getCXXOverloadedOperator() != OO_Array_New) | ||||
14798 | return; | ||||
14799 | |||||
14800 | Optional<unsigned> AlignmentParam; | ||||
14801 | bool IsNothrow = false; | ||||
14802 | if (!FD->isReplaceableGlobalAllocationFunction(&AlignmentParam, &IsNothrow)) | ||||
14803 | return; | ||||
14804 | |||||
14805 | // C++2a [basic.stc.dynamic.allocation]p4: | ||||
14806 | // An allocation function that has a non-throwing exception specification | ||||
14807 | // indicates failure by returning a null pointer value. Any other allocation | ||||
14808 | // function never returns a null pointer value and indicates failure only by | ||||
14809 | // throwing an exception [...] | ||||
14810 | if (!IsNothrow && !FD->hasAttr<ReturnsNonNullAttr>()) | ||||
14811 | FD->addAttr(ReturnsNonNullAttr::CreateImplicit(Context, FD->getLocation())); | ||||
14812 | |||||
14813 | // C++2a [basic.stc.dynamic.allocation]p2: | ||||
14814 | // An allocation function attempts to allocate the requested amount of | ||||
14815 | // storage. [...] If the request succeeds, the value returned by a | ||||
14816 | // replaceable allocation function is a [...] pointer value p0 different | ||||
14817 | // from any previously returned value p1 [...] | ||||
14818 | // | ||||
14819 | // However, this particular information is being added in codegen, | ||||
14820 | // because there is an opt-out switch for it (-fno-assume-sane-operator-new) | ||||
14821 | |||||
14822 | // C++2a [basic.stc.dynamic.allocation]p2: | ||||
14823 | // An allocation function attempts to allocate the requested amount of | ||||
14824 | // storage. If it is successful, it returns the address of the start of a | ||||
14825 | // block of storage whose length in bytes is at least as large as the | ||||
14826 | // requested size. | ||||
14827 | if (!FD->hasAttr<AllocSizeAttr>()) { | ||||
14828 | FD->addAttr(AllocSizeAttr::CreateImplicit( | ||||
14829 | Context, /*ElemSizeParam=*/ParamIdx(1, FD), | ||||
14830 | /*NumElemsParam=*/ParamIdx(), FD->getLocation())); | ||||
14831 | } | ||||
14832 | |||||
14833 | // C++2a [basic.stc.dynamic.allocation]p3: | ||||
14834 | // For an allocation function [...], the pointer returned on a successful | ||||
14835 | // call shall represent the address of storage that is aligned as follows: | ||||
14836 | // (3.1) If the allocation function takes an argument of type | ||||
14837 | // std​::​align_Âval_Ât, the storage will have the alignment | ||||
14838 | // specified by the value of this argument. | ||||
14839 | if (AlignmentParam.hasValue() && !FD->hasAttr<AllocAlignAttr>()) { | ||||
14840 | FD->addAttr(AllocAlignAttr::CreateImplicit( | ||||
14841 | Context, ParamIdx(AlignmentParam.getValue(), FD), FD->getLocation())); | ||||
14842 | } | ||||
14843 | |||||
14844 | // FIXME: | ||||
14845 | // C++2a [basic.stc.dynamic.allocation]p3: | ||||
14846 | // For an allocation function [...], the pointer returned on a successful | ||||
14847 | // call shall represent the address of storage that is aligned as follows: | ||||
14848 | // (3.2) Otherwise, if the allocation function is named operator new[], | ||||
14849 | // the storage is aligned for any object that does not have | ||||
14850 | // new-extended alignment ([basic.align]) and is no larger than the | ||||
14851 | // requested size. | ||||
14852 | // (3.3) Otherwise, the storage is aligned for any object that does not | ||||
14853 | // have new-extended alignment and is of the requested size. | ||||
14854 | } | ||||
14855 | |||||
14856 | /// Adds any function attributes that we know a priori based on | ||||
14857 | /// the declaration of this function. | ||||
14858 | /// | ||||
14859 | /// These attributes can apply both to implicitly-declared builtins | ||||
14860 | /// (like __builtin___printf_chk) or to library-declared functions | ||||
14861 | /// like NSLog or printf. | ||||
14862 | /// | ||||
14863 | /// We need to check for duplicate attributes both here and where user-written | ||||
14864 | /// attributes are applied to declarations. | ||||
14865 | void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { | ||||
14866 | if (FD->isInvalidDecl()) | ||||
14867 | return; | ||||
14868 | |||||
14869 | // If this is a built-in function, map its builtin attributes to | ||||
14870 | // actual attributes. | ||||
14871 | if (unsigned BuiltinID = FD->getBuiltinID()) { | ||||
14872 | // Handle printf-formatting attributes. | ||||
14873 | unsigned FormatIdx; | ||||
14874 | bool HasVAListArg; | ||||
14875 | if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { | ||||
14876 | if (!FD->hasAttr<FormatAttr>()) { | ||||
14877 | const char *fmt = "printf"; | ||||
14878 | unsigned int NumParams = FD->getNumParams(); | ||||
14879 | if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) | ||||
14880 | FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) | ||||
14881 | fmt = "NSString"; | ||||
14882 | FD->addAttr(FormatAttr::CreateImplicit(Context, | ||||
14883 | &Context.Idents.get(fmt), | ||||
14884 | FormatIdx+1, | ||||
14885 | HasVAListArg ? 0 : FormatIdx+2, | ||||
14886 | FD->getLocation())); | ||||
14887 | } | ||||
14888 | } | ||||
14889 | if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, | ||||
14890 | HasVAListArg)) { | ||||
14891 | if (!FD->hasAttr<FormatAttr>()) | ||||
14892 | FD->addAttr(FormatAttr::CreateImplicit(Context, | ||||
14893 | &Context.Idents.get("scanf"), | ||||
14894 | FormatIdx+1, | ||||
14895 | HasVAListArg ? 0 : FormatIdx+2, | ||||
14896 | FD->getLocation())); | ||||
14897 | } | ||||
14898 | |||||
14899 | // Handle automatically recognized callbacks. | ||||
14900 | SmallVector<int, 4> Encoding; | ||||
14901 | if (!FD->hasAttr<CallbackAttr>() && | ||||
14902 | Context.BuiltinInfo.performsCallback(BuiltinID, Encoding)) | ||||
14903 | FD->addAttr(CallbackAttr::CreateImplicit( | ||||
14904 | Context, Encoding.data(), Encoding.size(), FD->getLocation())); | ||||
14905 | |||||
14906 | // Mark const if we don't care about errno and that is the only thing | ||||
14907 | // preventing the function from being const. This allows IRgen to use LLVM | ||||
14908 | // intrinsics for such functions. | ||||
14909 | if (!getLangOpts().MathErrno && !FD->hasAttr<ConstAttr>() && | ||||
14910 | Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) | ||||
14911 | FD->addAttr(ConstAttr::CreateImplicit(Context, FD->getLocation())); | ||||
14912 | |||||
14913 | // We make "fma" on some platforms const because we know it does not set | ||||
14914 | // errno in those environments even though it could set errno based on the | ||||
14915 | // C standard. | ||||
14916 | const llvm::Triple &Trip = Context.getTargetInfo().getTriple(); | ||||
14917 | if ((Trip.isGNUEnvironment() || Trip.isAndroid() || Trip.isOSMSVCRT()) && | ||||
14918 | !FD->hasAttr<ConstAttr>()) { | ||||
14919 | switch (BuiltinID) { | ||||
14920 | case Builtin::BI__builtin_fma: | ||||
14921 | case Builtin::BI__builtin_fmaf: | ||||
14922 | case Builtin::BI__builtin_fmal: | ||||
14923 | case Builtin::BIfma: | ||||
14924 | case Builtin::BIfmaf: | ||||
14925 | case Builtin::BIfmal: | ||||
14926 | FD->addAttr(ConstAttr::CreateImplicit(Context, FD->getLocation())); | ||||
14927 | break; | ||||
14928 | default: | ||||
14929 | break; | ||||
14930 | } | ||||
14931 | } | ||||
14932 | |||||
14933 | if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && | ||||
14934 | !FD->hasAttr<ReturnsTwiceAttr>()) | ||||
14935 | FD->addAttr(ReturnsTwiceAttr::CreateImplicit(Context, | ||||
14936 | FD->getLocation())); | ||||
14937 | if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->hasAttr<NoThrowAttr>()) | ||||
14938 | FD->addAttr(NoThrowAttr::CreateImplicit(Context, FD->getLocation())); | ||||
14939 | if (Context.BuiltinInfo.isPure(BuiltinID) && !FD->hasAttr<PureAttr>()) | ||||
14940 | FD->addAttr(PureAttr::CreateImplicit(Context, FD->getLocation())); | ||||
14941 | if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->hasAttr<ConstAttr>()) | ||||
14942 | FD->addAttr(ConstAttr::CreateImplicit(Context, FD->getLocation())); | ||||
14943 | if (getLangOpts().CUDA && Context.BuiltinInfo.isTSBuiltin(BuiltinID) && | ||||
14944 | !FD->hasAttr<CUDADeviceAttr>() && !FD->hasAttr<CUDAHostAttr>()) { | ||||
14945 | // Add the appropriate attribute, depending on the CUDA compilation mode | ||||
14946 | // and which target the builtin belongs to. For example, during host | ||||
14947 | // compilation, aux builtins are __device__, while the rest are __host__. | ||||
14948 | if (getLangOpts().CUDAIsDevice != | ||||
14949 | Context.BuiltinInfo.isAuxBuiltinID(BuiltinID)) | ||||
14950 | FD->addAttr(CUDADeviceAttr::CreateImplicit(Context, FD->getLocation())); | ||||
14951 | else | ||||
14952 | FD->addAttr(CUDAHostAttr::CreateImplicit(Context, FD->getLocation())); | ||||
14953 | } | ||||
14954 | } | ||||
14955 | |||||
14956 | AddKnownFunctionAttributesForReplaceableGlobalAllocationFunction(FD); | ||||
14957 | |||||
14958 | // If C++ exceptions are enabled but we are told extern "C" functions cannot | ||||
14959 | // throw, add an implicit nothrow attribute to any extern "C" function we come | ||||
14960 | // across. | ||||
14961 | if (getLangOpts().CXXExceptions && getLangOpts().ExternCNoUnwind && | ||||
14962 | FD->isExternC() && !FD->hasAttr<NoThrowAttr>()) { | ||||
14963 | const auto *FPT = FD->getType()->getAs<FunctionProtoType>(); | ||||
14964 | if (!FPT || FPT->getExceptionSpecType() == EST_None) | ||||
14965 | FD->addAttr(NoThrowAttr::CreateImplicit(Context, FD->getLocation())); | ||||
14966 | } | ||||
14967 | |||||
14968 | IdentifierInfo *Name = FD->getIdentifier(); | ||||
14969 | if (!Name) | ||||
14970 | return; | ||||
14971 | if ((!getLangOpts().CPlusPlus && | ||||
14972 | FD->getDeclContext()->isTranslationUnit()) || | ||||
14973 | (isa<LinkageSpecDecl>(FD->getDeclContext()) && | ||||
14974 | cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == | ||||
14975 | LinkageSpecDecl::lang_c)) { | ||||
14976 | // Okay: this could be a libc/libm/Objective-C function we know | ||||
14977 | // about. | ||||
14978 | } else | ||||
14979 | return; | ||||
14980 | |||||
14981 | if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { | ||||
14982 | // FIXME: asprintf and vasprintf aren't C99 functions. Should they be | ||||
14983 | // target-specific builtins, perhaps? | ||||
14984 | if (!FD->hasAttr<FormatAttr>()) | ||||
14985 | FD->addAttr(FormatAttr::CreateImplicit(Context, | ||||
14986 | &Context.Idents.get("printf"), 2, | ||||
14987 | Name->isStr("vasprintf") ? 0 : 3, | ||||
14988 | FD->getLocation())); | ||||
14989 | } | ||||
14990 | |||||
14991 | if (Name->isStr("__CFStringMakeConstantString")) { | ||||
14992 | // We already have a __builtin___CFStringMakeConstantString, | ||||
14993 | // but builds that use -fno-constant-cfstrings don't go through that. | ||||
14994 | if (!FD->hasAttr<FormatArgAttr>()) | ||||
14995 | FD->addAttr(FormatArgAttr::CreateImplicit(Context, ParamIdx(1, FD), | ||||
14996 | FD->getLocation())); | ||||
14997 | } | ||||
14998 | } | ||||
14999 | |||||
15000 | TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, | ||||
15001 | TypeSourceInfo *TInfo) { | ||||
15002 | assert(D.getIdentifier() && "Wrong callback for declspec without declarator")((D.getIdentifier() && "Wrong callback for declspec without declarator" ) ? static_cast<void> (0) : __assert_fail ("D.getIdentifier() && \"Wrong callback for declspec without declarator\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 15002, __PRETTY_FUNCTION__)); | ||||
15003 | assert(!T.isNull() && "GetTypeForDeclarator() returned null type")((!T.isNull() && "GetTypeForDeclarator() returned null type" ) ? static_cast<void> (0) : __assert_fail ("!T.isNull() && \"GetTypeForDeclarator() returned null type\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 15003, __PRETTY_FUNCTION__)); | ||||
15004 | |||||
15005 | if (!TInfo) { | ||||
15006 | assert(D.isInvalidType() && "no declarator info for valid type")((D.isInvalidType() && "no declarator info for valid type" ) ? static_cast<void> (0) : __assert_fail ("D.isInvalidType() && \"no declarator info for valid type\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 15006, __PRETTY_FUNCTION__)); | ||||
15007 | TInfo = Context.getTrivialTypeSourceInfo(T); | ||||
15008 | } | ||||
15009 | |||||
15010 | // Scope manipulation handled by caller. | ||||
15011 | TypedefDecl *NewTD = | ||||
15012 | TypedefDecl::Create(Context, CurContext, D.getBeginLoc(), | ||||
15013 | D.getIdentifierLoc(), D.getIdentifier(), TInfo); | ||||
15014 | |||||
15015 | // Bail out immediately if we have an invalid declaration. | ||||
15016 | if (D.isInvalidType()) { | ||||
15017 | NewTD->setInvalidDecl(); | ||||
15018 | return NewTD; | ||||
15019 | } | ||||
15020 | |||||
15021 | if (D.getDeclSpec().isModulePrivateSpecified()) { | ||||
15022 | if (CurContext->isFunctionOrMethod()) | ||||
15023 | Diag(NewTD->getLocation(), diag::err_module_private_local) | ||||
15024 | << 2 << NewTD | ||||
15025 | << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) | ||||
15026 | << FixItHint::CreateRemoval( | ||||
15027 | D.getDeclSpec().getModulePrivateSpecLoc()); | ||||
15028 | else | ||||
15029 | NewTD->setModulePrivate(); | ||||
15030 | } | ||||
15031 | |||||
15032 | // C++ [dcl.typedef]p8: | ||||
15033 | // If the typedef declaration defines an unnamed class (or | ||||
15034 | // enum), the first typedef-name declared by the declaration | ||||
15035 | // to be that class type (or enum type) is used to denote the | ||||
15036 | // class type (or enum type) for linkage purposes only. | ||||
15037 | // We need to check whether the type was declared in the declaration. | ||||
15038 | switch (D.getDeclSpec().getTypeSpecType()) { | ||||
15039 | case TST_enum: | ||||
15040 | case TST_struct: | ||||
15041 | case TST_interface: | ||||
15042 | case TST_union: | ||||
15043 | case TST_class: { | ||||
15044 | TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); | ||||
15045 | setTagNameForLinkagePurposes(tagFromDeclSpec, NewTD); | ||||
15046 | break; | ||||
15047 | } | ||||
15048 | |||||
15049 | default: | ||||
15050 | break; | ||||
15051 | } | ||||
15052 | |||||
15053 | return NewTD; | ||||
15054 | } | ||||
15055 | |||||
15056 | /// Check that this is a valid underlying type for an enum declaration. | ||||
15057 | bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) { | ||||
15058 | SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); | ||||
15059 | QualType T = TI->getType(); | ||||
15060 | |||||
15061 | if (T->isDependentType()) | ||||
15062 | return false; | ||||
15063 | |||||
15064 | // This doesn't use 'isIntegralType' despite the error message mentioning | ||||
15065 | // integral type because isIntegralType would also allow enum types in C. | ||||
15066 | if (const BuiltinType *BT = T->getAs<BuiltinType>()) | ||||
15067 | if (BT->isInteger()) | ||||
15068 | return false; | ||||
15069 | |||||
15070 | if (T->isExtIntType()) | ||||
15071 | return false; | ||||
15072 | |||||
15073 | return Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T; | ||||
15074 | } | ||||
15075 | |||||
15076 | /// Check whether this is a valid redeclaration of a previous enumeration. | ||||
15077 | /// \return true if the redeclaration was invalid. | ||||
15078 | bool Sema::CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped, | ||||
15079 | QualType EnumUnderlyingTy, bool IsFixed, | ||||
15080 | const EnumDecl *Prev) { | ||||
15081 | if (IsScoped != Prev->isScoped()) { | ||||
15082 | Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch) | ||||
15083 | << Prev->isScoped(); | ||||
15084 | Diag(Prev->getLocation(), diag::note_previous_declaration); | ||||
15085 | return true; | ||||
15086 | } | ||||
15087 | |||||
15088 | if (IsFixed && Prev->isFixed()) { | ||||
15089 | if (!EnumUnderlyingTy->isDependentType() && | ||||
15090 | !Prev->getIntegerType()->isDependentType() && | ||||
15091 | !Context.hasSameUnqualifiedType(EnumUnderlyingTy, | ||||
15092 | Prev->getIntegerType())) { | ||||
15093 | // TODO: Highlight the underlying type of the redeclaration. | ||||
15094 | Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch) | ||||
15095 | << EnumUnderlyingTy << Prev->getIntegerType(); | ||||
15096 | Diag(Prev->getLocation(), diag::note_previous_declaration) | ||||
15097 | << Prev->getIntegerTypeRange(); | ||||
15098 | return true; | ||||
15099 | } | ||||
15100 | } else if (IsFixed != Prev->isFixed()) { | ||||
15101 | Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch) | ||||
15102 | << Prev->isFixed(); | ||||
15103 | Diag(Prev->getLocation(), diag::note_previous_declaration); | ||||
15104 | return true; | ||||
15105 | } | ||||
15106 | |||||
15107 | return false; | ||||
15108 | } | ||||
15109 | |||||
15110 | /// Get diagnostic %select index for tag kind for | ||||
15111 | /// redeclaration diagnostic message. | ||||
15112 | /// WARNING: Indexes apply to particular diagnostics only! | ||||
15113 | /// | ||||
15114 | /// \returns diagnostic %select index. | ||||
15115 | static unsigned getRedeclDiagFromTagKind(TagTypeKind Tag) { | ||||
15116 | switch (Tag) { | ||||
15117 | case TTK_Struct: return 0; | ||||
15118 | case TTK_Interface: return 1; | ||||
15119 | case TTK_Class: return 2; | ||||
15120 | default: llvm_unreachable("Invalid tag kind for redecl diagnostic!")::llvm::llvm_unreachable_internal("Invalid tag kind for redecl diagnostic!" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 15120); | ||||
15121 | } | ||||
15122 | } | ||||
15123 | |||||
15124 | /// Determine if tag kind is a class-key compatible with | ||||
15125 | /// class for redeclaration (class, struct, or __interface). | ||||
15126 | /// | ||||
15127 | /// \returns true iff the tag kind is compatible. | ||||
15128 | static bool isClassCompatTagKind(TagTypeKind Tag) | ||||
15129 | { | ||||
15130 | return Tag == TTK_Struct || Tag == TTK_Class || Tag == TTK_Interface; | ||||
15131 | } | ||||
15132 | |||||
15133 | Sema::NonTagKind Sema::getNonTagTypeDeclKind(const Decl *PrevDecl, | ||||
15134 | TagTypeKind TTK) { | ||||
15135 | if (isa<TypedefDecl>(PrevDecl)) | ||||
15136 | return NTK_Typedef; | ||||
15137 | else if (isa<TypeAliasDecl>(PrevDecl)) | ||||
15138 | return NTK_TypeAlias; | ||||
15139 | else if (isa<ClassTemplateDecl>(PrevDecl)) | ||||
15140 | return NTK_Template; | ||||
15141 | else if (isa<TypeAliasTemplateDecl>(PrevDecl)) | ||||
15142 | return NTK_TypeAliasTemplate; | ||||
15143 | else if (isa<TemplateTemplateParmDecl>(PrevDecl)) | ||||
15144 | return NTK_TemplateTemplateArgument; | ||||
15145 | switch (TTK) { | ||||
15146 | case TTK_Struct: | ||||
15147 | case TTK_Interface: | ||||
15148 | case TTK_Class: | ||||
15149 | return getLangOpts().CPlusPlus ? NTK_NonClass : NTK_NonStruct; | ||||
15150 | case TTK_Union: | ||||
15151 | return NTK_NonUnion; | ||||
15152 | case TTK_Enum: | ||||
15153 | return NTK_NonEnum; | ||||
15154 | } | ||||
15155 | llvm_unreachable("invalid TTK")::llvm::llvm_unreachable_internal("invalid TTK", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 15155); | ||||
15156 | } | ||||
15157 | |||||
15158 | /// Determine whether a tag with a given kind is acceptable | ||||
15159 | /// as a redeclaration of the given tag declaration. | ||||
15160 | /// | ||||
15161 | /// \returns true if the new tag kind is acceptable, false otherwise. | ||||
15162 | bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, | ||||
15163 | TagTypeKind NewTag, bool isDefinition, | ||||
15164 | SourceLocation NewTagLoc, | ||||
15165 | const IdentifierInfo *Name) { | ||||
15166 | // C++ [dcl.type.elab]p3: | ||||
15167 | // The class-key or enum keyword present in the | ||||
15168 | // elaborated-type-specifier shall agree in kind with the | ||||
15169 | // declaration to which the name in the elaborated-type-specifier | ||||
15170 | // refers. This rule also applies to the form of | ||||
15171 | // elaborated-type-specifier that declares a class-name or | ||||
15172 | // friend class since it can be construed as referring to the | ||||
15173 | // definition of the class. Thus, in any | ||||
15174 | // elaborated-type-specifier, the enum keyword shall be used to | ||||
15175 | // refer to an enumeration (7.2), the union class-key shall be | ||||
15176 | // used to refer to a union (clause 9), and either the class or | ||||
15177 | // struct class-key shall be used to refer to a class (clause 9) | ||||
15178 | // declared using the class or struct class-key. | ||||
15179 | TagTypeKind OldTag = Previous->getTagKind(); | ||||
15180 | if (OldTag != NewTag && | ||||
15181 | !(isClassCompatTagKind(OldTag) && isClassCompatTagKind(NewTag))) | ||||
15182 | return false; | ||||
15183 | |||||
15184 | // Tags are compatible, but we might still want to warn on mismatched tags. | ||||
15185 | // Non-class tags can't be mismatched at this point. | ||||
15186 | if (!isClassCompatTagKind(NewTag)) | ||||
15187 | return true; | ||||
15188 | |||||
15189 | // Declarations for which -Wmismatched-tags is disabled are entirely ignored | ||||
15190 | // by our warning analysis. We don't want to warn about mismatches with (eg) | ||||
15191 | // declarations in system headers that are designed to be specialized, but if | ||||
15192 | // a user asks us to warn, we should warn if their code contains mismatched | ||||
15193 | // declarations. | ||||
15194 | auto IsIgnoredLoc = [&](SourceLocation Loc) { | ||||
15195 | return getDiagnostics().isIgnored(diag::warn_struct_class_tag_mismatch, | ||||
15196 | Loc); | ||||
15197 | }; | ||||
15198 | if (IsIgnoredLoc(NewTagLoc)) | ||||
15199 | return true; | ||||
15200 | |||||
15201 | auto IsIgnored = [&](const TagDecl *Tag) { | ||||
15202 | return IsIgnoredLoc(Tag->getLocation()); | ||||
15203 | }; | ||||
15204 | while (IsIgnored(Previous)) { | ||||
15205 | Previous = Previous->getPreviousDecl(); | ||||
15206 | if (!Previous) | ||||
15207 | return true; | ||||
15208 | OldTag = Previous->getTagKind(); | ||||
15209 | } | ||||
15210 | |||||
15211 | bool isTemplate = false; | ||||
15212 | if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) | ||||
15213 | isTemplate = Record->getDescribedClassTemplate(); | ||||
15214 | |||||
15215 | if (inTemplateInstantiation()) { | ||||
15216 | if (OldTag != NewTag) { | ||||
15217 | // In a template instantiation, do not offer fix-its for tag mismatches | ||||
15218 | // since they usually mess up the template instead of fixing the problem. | ||||
15219 | Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) | ||||
15220 | << getRedeclDiagFromTagKind(NewTag) << isTemplate << Name | ||||
15221 | << getRedeclDiagFromTagKind(OldTag); | ||||
15222 | // FIXME: Note previous location? | ||||
15223 | } | ||||
15224 | return true; | ||||
15225 | } | ||||
15226 | |||||
15227 | if (isDefinition) { | ||||
15228 | // On definitions, check all previous tags and issue a fix-it for each | ||||
15229 | // one that doesn't match the current tag. | ||||
15230 | if (Previous->getDefinition()) { | ||||
15231 | // Don't suggest fix-its for redefinitions. | ||||
15232 | return true; | ||||
15233 | } | ||||
15234 | |||||
15235 | bool previousMismatch = false; | ||||
15236 | for (const TagDecl *I : Previous->redecls()) { | ||||
15237 | if (I->getTagKind() != NewTag) { | ||||
15238 | // Ignore previous declarations for which the warning was disabled. | ||||
15239 | if (IsIgnored(I)) | ||||
15240 | continue; | ||||
15241 | |||||
15242 | if (!previousMismatch) { | ||||
15243 | previousMismatch = true; | ||||
15244 | Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) | ||||
15245 | << getRedeclDiagFromTagKind(NewTag) << isTemplate << Name | ||||
15246 | << getRedeclDiagFromTagKind(I->getTagKind()); | ||||
15247 | } | ||||
15248 | Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) | ||||
15249 | << getRedeclDiagFromTagKind(NewTag) | ||||
15250 | << FixItHint::CreateReplacement(I->getInnerLocStart(), | ||||
15251 | TypeWithKeyword::getTagTypeKindName(NewTag)); | ||||
15252 | } | ||||
15253 | } | ||||
15254 | return true; | ||||
15255 | } | ||||
15256 | |||||
15257 | // Identify the prevailing tag kind: this is the kind of the definition (if | ||||
15258 | // there is a non-ignored definition), or otherwise the kind of the prior | ||||
15259 | // (non-ignored) declaration. | ||||
15260 | const TagDecl *PrevDef = Previous->getDefinition(); | ||||
15261 | if (PrevDef && IsIgnored(PrevDef)) | ||||
15262 | PrevDef = nullptr; | ||||
15263 | const TagDecl *Redecl = PrevDef ? PrevDef : Previous; | ||||
15264 | if (Redecl->getTagKind() != NewTag) { | ||||
15265 | Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) | ||||
15266 | << getRedeclDiagFromTagKind(NewTag) << isTemplate << Name | ||||
15267 | << getRedeclDiagFromTagKind(OldTag); | ||||
15268 | Diag(Redecl->getLocation(), diag::note_previous_use); | ||||
15269 | |||||
15270 | // If there is a previous definition, suggest a fix-it. | ||||
15271 | if (PrevDef) { | ||||
15272 | Diag(NewTagLoc, diag::note_struct_class_suggestion) | ||||
15273 | << getRedeclDiagFromTagKind(Redecl->getTagKind()) | ||||
15274 | << FixItHint::CreateReplacement(SourceRange(NewTagLoc), | ||||
15275 | TypeWithKeyword::getTagTypeKindName(Redecl->getTagKind())); | ||||
15276 | } | ||||
15277 | } | ||||
15278 | |||||
15279 | return true; | ||||
15280 | } | ||||
15281 | |||||
15282 | /// Add a minimal nested name specifier fixit hint to allow lookup of a tag name | ||||
15283 | /// from an outer enclosing namespace or file scope inside a friend declaration. | ||||
15284 | /// This should provide the commented out code in the following snippet: | ||||
15285 | /// namespace N { | ||||
15286 | /// struct X; | ||||
15287 | /// namespace M { | ||||
15288 | /// struct Y { friend struct /*N::*/ X; }; | ||||
15289 | /// } | ||||
15290 | /// } | ||||
15291 | static FixItHint createFriendTagNNSFixIt(Sema &SemaRef, NamedDecl *ND, Scope *S, | ||||
15292 | SourceLocation NameLoc) { | ||||
15293 | // While the decl is in a namespace, do repeated lookup of that name and see | ||||
15294 | // if we get the same namespace back. If we do not, continue until | ||||
15295 | // translation unit scope, at which point we have a fully qualified NNS. | ||||
15296 | SmallVector<IdentifierInfo *, 4> Namespaces; | ||||
15297 | DeclContext *DC = ND->getDeclContext()->getRedeclContext(); | ||||
15298 | for (; !DC->isTranslationUnit(); DC = DC->getParent()) { | ||||
15299 | // This tag should be declared in a namespace, which can only be enclosed by | ||||
15300 | // other namespaces. Bail if there's an anonymous namespace in the chain. | ||||
15301 | NamespaceDecl *Namespace = dyn_cast<NamespaceDecl>(DC); | ||||
15302 | if (!Namespace || Namespace->isAnonymousNamespace()) | ||||
15303 | return FixItHint(); | ||||
15304 | IdentifierInfo *II = Namespace->getIdentifier(); | ||||
15305 | Namespaces.push_back(II); | ||||
15306 | NamedDecl *Lookup = SemaRef.LookupSingleName( | ||||
15307 | S, II, NameLoc, Sema::LookupNestedNameSpecifierName); | ||||
15308 | if (Lookup == Namespace) | ||||
15309 | break; | ||||
15310 | } | ||||
15311 | |||||
15312 | // Once we have all the namespaces, reverse them to go outermost first, and | ||||
15313 | // build an NNS. | ||||
15314 | SmallString<64> Insertion; | ||||
15315 | llvm::raw_svector_ostream OS(Insertion); | ||||
15316 | if (DC->isTranslationUnit()) | ||||
15317 | OS << "::"; | ||||
15318 | std::reverse(Namespaces.begin(), Namespaces.end()); | ||||
15319 | for (auto *II : Namespaces) | ||||
15320 | OS << II->getName() << "::"; | ||||
15321 | return FixItHint::CreateInsertion(NameLoc, Insertion); | ||||
15322 | } | ||||
15323 | |||||
15324 | /// Determine whether a tag originally declared in context \p OldDC can | ||||
15325 | /// be redeclared with an unqualified name in \p NewDC (assuming name lookup | ||||
15326 | /// found a declaration in \p OldDC as a previous decl, perhaps through a | ||||
15327 | /// using-declaration). | ||||
15328 | static bool isAcceptableTagRedeclContext(Sema &S, DeclContext *OldDC, | ||||
15329 | DeclContext *NewDC) { | ||||
15330 | OldDC = OldDC->getRedeclContext(); | ||||
15331 | NewDC = NewDC->getRedeclContext(); | ||||
15332 | |||||
15333 | if (OldDC->Equals(NewDC)) | ||||
15334 | return true; | ||||
15335 | |||||
15336 | // In MSVC mode, we allow a redeclaration if the contexts are related (either | ||||
15337 | // encloses the other). | ||||
15338 | if (S.getLangOpts().MSVCCompat && | ||||
15339 | (OldDC->Encloses(NewDC) || NewDC->Encloses(OldDC))) | ||||
15340 | return true; | ||||
15341 | |||||
15342 | return false; | ||||
15343 | } | ||||
15344 | |||||
15345 | /// This is invoked when we see 'struct foo' or 'struct {'. In the | ||||
15346 | /// former case, Name will be non-null. In the later case, Name will be null. | ||||
15347 | /// TagSpec indicates what kind of tag this is. TUK indicates whether this is a | ||||
15348 | /// reference/declaration/definition of a tag. | ||||
15349 | /// | ||||
15350 | /// \param IsTypeSpecifier \c true if this is a type-specifier (or | ||||
15351 | /// trailing-type-specifier) other than one in an alias-declaration. | ||||
15352 | /// | ||||
15353 | /// \param SkipBody If non-null, will be set to indicate if the caller should | ||||
15354 | /// skip the definition of this tag and treat it as if it were a declaration. | ||||
15355 | Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, | ||||
15356 | SourceLocation KWLoc, CXXScopeSpec &SS, | ||||
15357 | IdentifierInfo *Name, SourceLocation NameLoc, | ||||
15358 | const ParsedAttributesView &Attrs, AccessSpecifier AS, | ||||
15359 | SourceLocation ModulePrivateLoc, | ||||
15360 | MultiTemplateParamsArg TemplateParameterLists, | ||||
15361 | bool &OwnedDecl, bool &IsDependent, | ||||
15362 | SourceLocation ScopedEnumKWLoc, | ||||
15363 | bool ScopedEnumUsesClassTag, TypeResult UnderlyingType, | ||||
15364 | bool IsTypeSpecifier, bool IsTemplateParamOrArg, | ||||
15365 | SkipBodyInfo *SkipBody) { | ||||
15366 | // If this is not a definition, it must have a name. | ||||
15367 | IdentifierInfo *OrigName = Name; | ||||
15368 | assert((Name != nullptr || TUK == TUK_Definition) &&(((Name != nullptr || TUK == TUK_Definition) && "Nameless record must be a definition!" ) ? static_cast<void> (0) : __assert_fail ("(Name != nullptr || TUK == TUK_Definition) && \"Nameless record must be a definition!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 15369, __PRETTY_FUNCTION__)) | ||||
15369 | "Nameless record must be a definition!")(((Name != nullptr || TUK == TUK_Definition) && "Nameless record must be a definition!" ) ? static_cast<void> (0) : __assert_fail ("(Name != nullptr || TUK == TUK_Definition) && \"Nameless record must be a definition!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 15369, __PRETTY_FUNCTION__)); | ||||
15370 | assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference)((TemplateParameterLists.size() == 0 || TUK != TUK_Reference) ? static_cast<void> (0) : __assert_fail ("TemplateParameterLists.size() == 0 || TUK != TUK_Reference" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 15370, __PRETTY_FUNCTION__)); | ||||
15371 | |||||
15372 | OwnedDecl = false; | ||||
15373 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); | ||||
15374 | bool ScopedEnum = ScopedEnumKWLoc.isValid(); | ||||
15375 | |||||
15376 | // FIXME: Check member specializations more carefully. | ||||
15377 | bool isMemberSpecialization = false; | ||||
15378 | bool Invalid = false; | ||||
15379 | |||||
15380 | // We only need to do this matching if we have template parameters | ||||
15381 | // or a scope specifier, which also conveniently avoids this work | ||||
15382 | // for non-C++ cases. | ||||
15383 | if (TemplateParameterLists.size() > 0 || | ||||
15384 | (SS.isNotEmpty() && TUK != TUK_Reference)) { | ||||
15385 | if (TemplateParameterList *TemplateParams = | ||||
15386 | MatchTemplateParametersToScopeSpecifier( | ||||
15387 | KWLoc, NameLoc, SS, nullptr, TemplateParameterLists, | ||||
15388 | TUK == TUK_Friend, isMemberSpecialization, Invalid)) { | ||||
15389 | if (Kind == TTK_Enum) { | ||||
15390 | Diag(KWLoc, diag::err_enum_template); | ||||
15391 | return nullptr; | ||||
15392 | } | ||||
15393 | |||||
15394 | if (TemplateParams->size() > 0) { | ||||
15395 | // This is a declaration or definition of a class template (which may | ||||
15396 | // be a member of another template). | ||||
15397 | |||||
15398 | if (Invalid) | ||||
15399 | return nullptr; | ||||
15400 | |||||
15401 | OwnedDecl = false; | ||||
15402 | DeclResult Result = CheckClassTemplate( | ||||
15403 | S, TagSpec, TUK, KWLoc, SS, Name, NameLoc, Attrs, TemplateParams, | ||||
15404 | AS, ModulePrivateLoc, | ||||
15405 | /*FriendLoc*/ SourceLocation(), TemplateParameterLists.size() - 1, | ||||
15406 | TemplateParameterLists.data(), SkipBody); | ||||
15407 | return Result.get(); | ||||
15408 | } else { | ||||
15409 | // The "template<>" header is extraneous. | ||||
15410 | Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) | ||||
15411 | << TypeWithKeyword::getTagTypeKindName(Kind) << Name; | ||||
15412 | isMemberSpecialization = true; | ||||
15413 | } | ||||
15414 | } | ||||
15415 | |||||
15416 | if (!TemplateParameterLists.empty() && isMemberSpecialization && | ||||
15417 | CheckTemplateDeclScope(S, TemplateParameterLists.back())) | ||||
15418 | return nullptr; | ||||
15419 | } | ||||
15420 | |||||
15421 | // Figure out the underlying type if this a enum declaration. We need to do | ||||
15422 | // this early, because it's needed to detect if this is an incompatible | ||||
15423 | // redeclaration. | ||||
15424 | llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; | ||||
15425 | bool IsFixed = !UnderlyingType.isUnset() || ScopedEnum; | ||||
15426 | |||||
15427 | if (Kind == TTK_Enum) { | ||||
15428 | if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) { | ||||
15429 | // No underlying type explicitly specified, or we failed to parse the | ||||
15430 | // type, default to int. | ||||
15431 | EnumUnderlying = Context.IntTy.getTypePtr(); | ||||
15432 | } else if (UnderlyingType.get()) { | ||||
15433 | // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an | ||||
15434 | // integral type; any cv-qualification is ignored. | ||||
15435 | TypeSourceInfo *TI = nullptr; | ||||
15436 | GetTypeFromParser(UnderlyingType.get(), &TI); | ||||
15437 | EnumUnderlying = TI; | ||||
15438 | |||||
15439 | if (CheckEnumUnderlyingType(TI)) | ||||
15440 | // Recover by falling back to int. | ||||
15441 | EnumUnderlying = Context.IntTy.getTypePtr(); | ||||
15442 | |||||
15443 | if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI, | ||||
15444 | UPPC_FixedUnderlyingType)) | ||||
15445 | EnumUnderlying = Context.IntTy.getTypePtr(); | ||||
15446 | |||||
15447 | } else if (Context.getTargetInfo().getTriple().isWindowsMSVCEnvironment()) { | ||||
15448 | // For MSVC ABI compatibility, unfixed enums must use an underlying type | ||||
15449 | // of 'int'. However, if this is an unfixed forward declaration, don't set | ||||
15450 | // the underlying type unless the user enables -fms-compatibility. This | ||||
15451 | // makes unfixed forward declared enums incomplete and is more conforming. | ||||
15452 | if (TUK == TUK_Definition || getLangOpts().MSVCCompat) | ||||
15453 | EnumUnderlying = Context.IntTy.getTypePtr(); | ||||
15454 | } | ||||
15455 | } | ||||
15456 | |||||
15457 | DeclContext *SearchDC = CurContext; | ||||
15458 | DeclContext *DC = CurContext; | ||||
15459 | bool isStdBadAlloc = false; | ||||
15460 | bool isStdAlignValT = false; | ||||
15461 | |||||
15462 | RedeclarationKind Redecl = forRedeclarationInCurContext(); | ||||
15463 | if (TUK == TUK_Friend || TUK == TUK_Reference) | ||||
15464 | Redecl = NotForRedeclaration; | ||||
15465 | |||||
15466 | /// Create a new tag decl in C/ObjC. Since the ODR-like semantics for ObjC/C | ||||
15467 | /// implemented asks for structural equivalence checking, the returned decl | ||||
15468 | /// here is passed back to the parser, allowing the tag body to be parsed. | ||||
15469 | auto createTagFromNewDecl = [&]() -> TagDecl * { | ||||
15470 | assert(!getLangOpts().CPlusPlus && "not meant for C++ usage")((!getLangOpts().CPlusPlus && "not meant for C++ usage" ) ? static_cast<void> (0) : __assert_fail ("!getLangOpts().CPlusPlus && \"not meant for C++ usage\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 15470, __PRETTY_FUNCTION__)); | ||||
15471 | // If there is an identifier, use the location of the identifier as the | ||||
15472 | // location of the decl, otherwise use the location of the struct/union | ||||
15473 | // keyword. | ||||
15474 | SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; | ||||
15475 | TagDecl *New = nullptr; | ||||
15476 | |||||
15477 | if (Kind == TTK_Enum) { | ||||
15478 | New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, nullptr, | ||||
15479 | ScopedEnum, ScopedEnumUsesClassTag, IsFixed); | ||||
15480 | // If this is an undefined enum, bail. | ||||
15481 | if (TUK != TUK_Definition && !Invalid) | ||||
15482 | return nullptr; | ||||
15483 | if (EnumUnderlying) { | ||||
15484 | EnumDecl *ED = cast<EnumDecl>(New); | ||||
15485 | if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo *>()) | ||||
15486 | ED->setIntegerTypeSourceInfo(TI); | ||||
15487 | else | ||||
15488 | ED->setIntegerType(QualType(EnumUnderlying.get<const Type *>(), 0)); | ||||
15489 | ED->setPromotionType(ED->getIntegerType()); | ||||
15490 | } | ||||
15491 | } else { // struct/union | ||||
15492 | New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, | ||||
15493 | nullptr); | ||||
15494 | } | ||||
15495 | |||||
15496 | if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { | ||||
15497 | // Add alignment attributes if necessary; these attributes are checked | ||||
15498 | // when the ASTContext lays out the structure. | ||||
15499 | // | ||||
15500 | // It is important for implementing the correct semantics that this | ||||
15501 | // happen here (in ActOnTag). The #pragma pack stack is | ||||
15502 | // maintained as a result of parser callbacks which can occur at | ||||
15503 | // many points during the parsing of a struct declaration (because | ||||
15504 | // the #pragma tokens are effectively skipped over during the | ||||
15505 | // parsing of the struct). | ||||
15506 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) { | ||||
15507 | AddAlignmentAttributesForRecord(RD); | ||||
15508 | AddMsStructLayoutForRecord(RD); | ||||
15509 | } | ||||
15510 | } | ||||
15511 | New->setLexicalDeclContext(CurContext); | ||||
15512 | return New; | ||||
15513 | }; | ||||
15514 | |||||
15515 | LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); | ||||
15516 | if (Name && SS.isNotEmpty()) { | ||||
15517 | // We have a nested-name tag ('struct foo::bar'). | ||||
15518 | |||||
15519 | // Check for invalid 'foo::'. | ||||
15520 | if (SS.isInvalid()) { | ||||
15521 | Name = nullptr; | ||||
15522 | goto CreateNewDecl; | ||||
15523 | } | ||||
15524 | |||||
15525 | // If this is a friend or a reference to a class in a dependent | ||||
15526 | // context, don't try to make a decl for it. | ||||
15527 | if (TUK == TUK_Friend || TUK == TUK_Reference) { | ||||
15528 | DC = computeDeclContext(SS, false); | ||||
15529 | if (!DC) { | ||||
15530 | IsDependent = true; | ||||
15531 | return nullptr; | ||||
15532 | } | ||||
15533 | } else { | ||||
15534 | DC = computeDeclContext(SS, true); | ||||
15535 | if (!DC) { | ||||
15536 | Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) | ||||
15537 | << SS.getRange(); | ||||
15538 | return nullptr; | ||||
15539 | } | ||||
15540 | } | ||||
15541 | |||||
15542 | if (RequireCompleteDeclContext(SS, DC)) | ||||
15543 | return nullptr; | ||||
15544 | |||||
15545 | SearchDC = DC; | ||||
15546 | // Look-up name inside 'foo::'. | ||||
15547 | LookupQualifiedName(Previous, DC); | ||||
15548 | |||||
15549 | if (Previous.isAmbiguous()) | ||||
15550 | return nullptr; | ||||
15551 | |||||
15552 | if (Previous.empty()) { | ||||
15553 | // Name lookup did not find anything. However, if the | ||||
15554 | // nested-name-specifier refers to the current instantiation, | ||||
15555 | // and that current instantiation has any dependent base | ||||
15556 | // classes, we might find something at instantiation time: treat | ||||
15557 | // this as a dependent elaborated-type-specifier. | ||||
15558 | // But this only makes any sense for reference-like lookups. | ||||
15559 | if (Previous.wasNotFoundInCurrentInstantiation() && | ||||
15560 | (TUK == TUK_Reference || TUK == TUK_Friend)) { | ||||
15561 | IsDependent = true; | ||||
15562 | return nullptr; | ||||
15563 | } | ||||
15564 | |||||
15565 | // A tag 'foo::bar' must already exist. | ||||
15566 | Diag(NameLoc, diag::err_not_tag_in_scope) | ||||
15567 | << Kind << Name << DC << SS.getRange(); | ||||
15568 | Name = nullptr; | ||||
15569 | Invalid = true; | ||||
15570 | goto CreateNewDecl; | ||||
15571 | } | ||||
15572 | } else if (Name) { | ||||
15573 | // C++14 [class.mem]p14: | ||||
15574 | // If T is the name of a class, then each of the following shall have a | ||||
15575 | // name different from T: | ||||
15576 | // -- every member of class T that is itself a type | ||||
15577 | if (TUK != TUK_Reference && TUK != TUK_Friend && | ||||
15578 | DiagnoseClassNameShadow(SearchDC, DeclarationNameInfo(Name, NameLoc))) | ||||
15579 | return nullptr; | ||||
15580 | |||||
15581 | // If this is a named struct, check to see if there was a previous forward | ||||
15582 | // declaration or definition. | ||||
15583 | // FIXME: We're looking into outer scopes here, even when we | ||||
15584 | // shouldn't be. Doing so can result in ambiguities that we | ||||
15585 | // shouldn't be diagnosing. | ||||
15586 | LookupName(Previous, S); | ||||
15587 | |||||
15588 | // When declaring or defining a tag, ignore ambiguities introduced | ||||
15589 | // by types using'ed into this scope. | ||||
15590 | if (Previous.isAmbiguous() && | ||||
15591 | (TUK == TUK_Definition || TUK == TUK_Declaration)) { | ||||
15592 | LookupResult::Filter F = Previous.makeFilter(); | ||||
15593 | while (F.hasNext()) { | ||||
15594 | NamedDecl *ND = F.next(); | ||||
15595 | if (!ND->getDeclContext()->getRedeclContext()->Equals( | ||||
15596 | SearchDC->getRedeclContext())) | ||||
15597 | F.erase(); | ||||
15598 | } | ||||
15599 | F.done(); | ||||
15600 | } | ||||
15601 | |||||
15602 | // C++11 [namespace.memdef]p3: | ||||
15603 | // If the name in a friend declaration is neither qualified nor | ||||
15604 | // a template-id and the declaration is a function or an | ||||
15605 | // elaborated-type-specifier, the lookup to determine whether | ||||
15606 | // the entity has been previously declared shall not consider | ||||
15607 | // any scopes outside the innermost enclosing namespace. | ||||
15608 | // | ||||
15609 | // MSVC doesn't implement the above rule for types, so a friend tag | ||||
15610 | // declaration may be a redeclaration of a type declared in an enclosing | ||||
15611 | // scope. They do implement this rule for friend functions. | ||||
15612 | // | ||||
15613 | // Does it matter that this should be by scope instead of by | ||||
15614 | // semantic context? | ||||
15615 | if (!Previous.empty() && TUK == TUK_Friend) { | ||||
15616 | DeclContext *EnclosingNS = SearchDC->getEnclosingNamespaceContext(); | ||||
15617 | LookupResult::Filter F = Previous.makeFilter(); | ||||
15618 | bool FriendSawTagOutsideEnclosingNamespace = false; | ||||
15619 | while (F.hasNext()) { | ||||
15620 | NamedDecl *ND = F.next(); | ||||
15621 | DeclContext *DC = ND->getDeclContext()->getRedeclContext(); | ||||
15622 | if (DC->isFileContext() && | ||||
15623 | !EnclosingNS->Encloses(ND->getDeclContext())) { | ||||
15624 | if (getLangOpts().MSVCCompat) | ||||
15625 | FriendSawTagOutsideEnclosingNamespace = true; | ||||
15626 | else | ||||
15627 | F.erase(); | ||||
15628 | } | ||||
15629 | } | ||||
15630 | F.done(); | ||||
15631 | |||||
15632 | // Diagnose this MSVC extension in the easy case where lookup would have | ||||
15633 | // unambiguously found something outside the enclosing namespace. | ||||
15634 | if (Previous.isSingleResult() && FriendSawTagOutsideEnclosingNamespace) { | ||||
15635 | NamedDecl *ND = Previous.getFoundDecl(); | ||||
15636 | Diag(NameLoc, diag::ext_friend_tag_redecl_outside_namespace) | ||||
15637 | << createFriendTagNNSFixIt(*this, ND, S, NameLoc); | ||||
15638 | } | ||||
15639 | } | ||||
15640 | |||||
15641 | // Note: there used to be some attempt at recovery here. | ||||
15642 | if (Previous.isAmbiguous()) | ||||
15643 | return nullptr; | ||||
15644 | |||||
15645 | if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) { | ||||
15646 | // FIXME: This makes sure that we ignore the contexts associated | ||||
15647 | // with C structs, unions, and enums when looking for a matching | ||||
15648 | // tag declaration or definition. See the similar lookup tweak | ||||
15649 | // in Sema::LookupName; is there a better way to deal with this? | ||||
15650 | while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) | ||||
15651 | SearchDC = SearchDC->getParent(); | ||||
15652 | } | ||||
15653 | } | ||||
15654 | |||||
15655 | if (Previous.isSingleResult() && | ||||
15656 | Previous.getFoundDecl()->isTemplateParameter()) { | ||||
15657 | // Maybe we will complain about the shadowed template parameter. | ||||
15658 | DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); | ||||
15659 | // Just pretend that we didn't see the previous declaration. | ||||
15660 | Previous.clear(); | ||||
15661 | } | ||||
15662 | |||||
15663 | if (getLangOpts().CPlusPlus && Name && DC && StdNamespace && | ||||
15664 | DC->Equals(getStdNamespace())) { | ||||
15665 | if (Name->isStr("bad_alloc")) { | ||||
15666 | // This is a declaration of or a reference to "std::bad_alloc". | ||||
15667 | isStdBadAlloc = true; | ||||
15668 | |||||
15669 | // If std::bad_alloc has been implicitly declared (but made invisible to | ||||
15670 | // name lookup), fill in this implicit declaration as the previous | ||||
15671 | // declaration, so that the declarations get chained appropriately. | ||||
15672 | if (Previous.empty() && StdBadAlloc) | ||||
15673 | Previous.addDecl(getStdBadAlloc()); | ||||
15674 | } else if (Name->isStr("align_val_t")) { | ||||
15675 | isStdAlignValT = true; | ||||
15676 | if (Previous.empty() && StdAlignValT) | ||||
15677 | Previous.addDecl(getStdAlignValT()); | ||||
15678 | } | ||||
15679 | } | ||||
15680 | |||||
15681 | // If we didn't find a previous declaration, and this is a reference | ||||
15682 | // (or friend reference), move to the correct scope. In C++, we | ||||
15683 | // also need to do a redeclaration lookup there, just in case | ||||
15684 | // there's a shadow friend decl. | ||||
15685 | if (Name && Previous.empty() && | ||||
15686 | (TUK == TUK_Reference || TUK == TUK_Friend || IsTemplateParamOrArg)) { | ||||
15687 | if (Invalid) goto CreateNewDecl; | ||||
15688 | assert(SS.isEmpty())((SS.isEmpty()) ? static_cast<void> (0) : __assert_fail ("SS.isEmpty()", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 15688, __PRETTY_FUNCTION__)); | ||||
15689 | |||||
15690 | if (TUK == TUK_Reference || IsTemplateParamOrArg) { | ||||
15691 | // C++ [basic.scope.pdecl]p5: | ||||
15692 | // -- for an elaborated-type-specifier of the form | ||||
15693 | // | ||||
15694 | // class-key identifier | ||||
15695 | // | ||||
15696 | // if the elaborated-type-specifier is used in the | ||||
15697 | // decl-specifier-seq or parameter-declaration-clause of a | ||||
15698 | // function defined in namespace scope, the identifier is | ||||
15699 | // declared as a class-name in the namespace that contains | ||||
15700 | // the declaration; otherwise, except as a friend | ||||
15701 | // declaration, the identifier is declared in the smallest | ||||
15702 | // non-class, non-function-prototype scope that contains the | ||||
15703 | // declaration. | ||||
15704 | // | ||||
15705 | // C99 6.7.2.3p8 has a similar (but not identical!) provision for | ||||
15706 | // C structs and unions. | ||||
15707 | // | ||||
15708 | // It is an error in C++ to declare (rather than define) an enum | ||||
15709 | // type, including via an elaborated type specifier. We'll | ||||
15710 | // diagnose that later; for now, declare the enum in the same | ||||
15711 | // scope as we would have picked for any other tag type. | ||||
15712 | // | ||||
15713 | // GNU C also supports this behavior as part of its incomplete | ||||
15714 | // enum types extension, while GNU C++ does not. | ||||
15715 | // | ||||
15716 | // Find the context where we'll be declaring the tag. | ||||
15717 | // FIXME: We would like to maintain the current DeclContext as the | ||||
15718 | // lexical context, | ||||
15719 | SearchDC = getTagInjectionContext(SearchDC); | ||||
15720 | |||||
15721 | // Find the scope where we'll be declaring the tag. | ||||
15722 | S = getTagInjectionScope(S, getLangOpts()); | ||||
15723 | } else { | ||||
15724 | assert(TUK == TUK_Friend)((TUK == TUK_Friend) ? static_cast<void> (0) : __assert_fail ("TUK == TUK_Friend", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 15724, __PRETTY_FUNCTION__)); | ||||
15725 | // C++ [namespace.memdef]p3: | ||||
15726 | // If a friend declaration in a non-local class first declares a | ||||
15727 | // class or function, the friend class or function is a member of | ||||
15728 | // the innermost enclosing namespace. | ||||
15729 | SearchDC = SearchDC->getEnclosingNamespaceContext(); | ||||
15730 | } | ||||
15731 | |||||
15732 | // In C++, we need to do a redeclaration lookup to properly | ||||
15733 | // diagnose some problems. | ||||
15734 | // FIXME: redeclaration lookup is also used (with and without C++) to find a | ||||
15735 | // hidden declaration so that we don't get ambiguity errors when using a | ||||
15736 | // type declared by an elaborated-type-specifier. In C that is not correct | ||||
15737 | // and we should instead merge compatible types found by lookup. | ||||
15738 | if (getLangOpts().CPlusPlus) { | ||||
15739 | // FIXME: This can perform qualified lookups into function contexts, | ||||
15740 | // which are meaningless. | ||||
15741 | Previous.setRedeclarationKind(forRedeclarationInCurContext()); | ||||
15742 | LookupQualifiedName(Previous, SearchDC); | ||||
15743 | } else { | ||||
15744 | Previous.setRedeclarationKind(forRedeclarationInCurContext()); | ||||
15745 | LookupName(Previous, S); | ||||
15746 | } | ||||
15747 | } | ||||
15748 | |||||
15749 | // If we have a known previous declaration to use, then use it. | ||||
15750 | if (Previous.empty() && SkipBody && SkipBody->Previous) | ||||
15751 | Previous.addDecl(SkipBody->Previous); | ||||
15752 | |||||
15753 | if (!Previous.empty()) { | ||||
15754 | NamedDecl *PrevDecl = Previous.getFoundDecl(); | ||||
15755 | NamedDecl *DirectPrevDecl = Previous.getRepresentativeDecl(); | ||||
15756 | |||||
15757 | // It's okay to have a tag decl in the same scope as a typedef | ||||
15758 | // which hides a tag decl in the same scope. Finding this | ||||
15759 | // insanity with a redeclaration lookup can only actually happen | ||||
15760 | // in C++. | ||||
15761 | // | ||||
15762 | // This is also okay for elaborated-type-specifiers, which is | ||||
15763 | // technically forbidden by the current standard but which is | ||||
15764 | // okay according to the likely resolution of an open issue; | ||||
15765 | // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 | ||||
15766 | if (getLangOpts().CPlusPlus) { | ||||
15767 | if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { | ||||
15768 | if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { | ||||
15769 | TagDecl *Tag = TT->getDecl(); | ||||
15770 | if (Tag->getDeclName() == Name && | ||||
15771 | Tag->getDeclContext()->getRedeclContext() | ||||
15772 | ->Equals(TD->getDeclContext()->getRedeclContext())) { | ||||
15773 | PrevDecl = Tag; | ||||
15774 | Previous.clear(); | ||||
15775 | Previous.addDecl(Tag); | ||||
15776 | Previous.resolveKind(); | ||||
15777 | } | ||||
15778 | } | ||||
15779 | } | ||||
15780 | } | ||||
15781 | |||||
15782 | // If this is a redeclaration of a using shadow declaration, it must | ||||
15783 | // declare a tag in the same context. In MSVC mode, we allow a | ||||
15784 | // redefinition if either context is within the other. | ||||
15785 | if (auto *Shadow = dyn_cast<UsingShadowDecl>(DirectPrevDecl)) { | ||||
15786 | auto *OldTag = dyn_cast<TagDecl>(PrevDecl); | ||||
15787 | if (SS.isEmpty() && TUK != TUK_Reference && TUK != TUK_Friend && | ||||
15788 | isDeclInScope(Shadow, SearchDC, S, isMemberSpecialization) && | ||||
15789 | !(OldTag && isAcceptableTagRedeclContext( | ||||
15790 | *this, OldTag->getDeclContext(), SearchDC))) { | ||||
15791 | Diag(KWLoc, diag::err_using_decl_conflict_reverse); | ||||
15792 | Diag(Shadow->getTargetDecl()->getLocation(), | ||||
15793 | diag::note_using_decl_target); | ||||
15794 | Diag(Shadow->getUsingDecl()->getLocation(), diag::note_using_decl) | ||||
15795 | << 0; | ||||
15796 | // Recover by ignoring the old declaration. | ||||
15797 | Previous.clear(); | ||||
15798 | goto CreateNewDecl; | ||||
15799 | } | ||||
15800 | } | ||||
15801 | |||||
15802 | if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { | ||||
15803 | // If this is a use of a previous tag, or if the tag is already declared | ||||
15804 | // in the same scope (so that the definition/declaration completes or | ||||
15805 | // rementions the tag), reuse the decl. | ||||
15806 | if (TUK == TUK_Reference || TUK == TUK_Friend || | ||||
15807 | isDeclInScope(DirectPrevDecl, SearchDC, S, | ||||
15808 | SS.isNotEmpty() || isMemberSpecialization)) { | ||||
15809 | // Make sure that this wasn't declared as an enum and now used as a | ||||
15810 | // struct or something similar. | ||||
15811 | if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, | ||||
15812 | TUK == TUK_Definition, KWLoc, | ||||
15813 | Name)) { | ||||
15814 | bool SafeToContinue | ||||
15815 | = (PrevTagDecl->getTagKind() != TTK_Enum && | ||||
15816 | Kind != TTK_Enum); | ||||
15817 | if (SafeToContinue) | ||||
15818 | Diag(KWLoc, diag::err_use_with_wrong_tag) | ||||
15819 | << Name | ||||
15820 | << FixItHint::CreateReplacement(SourceRange(KWLoc), | ||||
15821 | PrevTagDecl->getKindName()); | ||||
15822 | else | ||||
15823 | Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; | ||||
15824 | Diag(PrevTagDecl->getLocation(), diag::note_previous_use); | ||||
15825 | |||||
15826 | if (SafeToContinue) | ||||
15827 | Kind = PrevTagDecl->getTagKind(); | ||||
15828 | else { | ||||
15829 | // Recover by making this an anonymous redefinition. | ||||
15830 | Name = nullptr; | ||||
15831 | Previous.clear(); | ||||
15832 | Invalid = true; | ||||
15833 | } | ||||
15834 | } | ||||
15835 | |||||
15836 | if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { | ||||
15837 | const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); | ||||
15838 | if (TUK == TUK_Reference || TUK == TUK_Friend) | ||||
15839 | return PrevTagDecl; | ||||
15840 | |||||
15841 | QualType EnumUnderlyingTy; | ||||
15842 | if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) | ||||
15843 | EnumUnderlyingTy = TI->getType().getUnqualifiedType(); | ||||
15844 | else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>()) | ||||
15845 | EnumUnderlyingTy = QualType(T, 0); | ||||
15846 | |||||
15847 | // All conflicts with previous declarations are recovered by | ||||
15848 | // returning the previous declaration, unless this is a definition, | ||||
15849 | // in which case we want the caller to bail out. | ||||
15850 | if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc, | ||||
15851 | ScopedEnum, EnumUnderlyingTy, | ||||
15852 | IsFixed, PrevEnum)) | ||||
15853 | return TUK == TUK_Declaration ? PrevTagDecl : nullptr; | ||||
15854 | } | ||||
15855 | |||||
15856 | // C++11 [class.mem]p1: | ||||
15857 | // A member shall not be declared twice in the member-specification, | ||||
15858 | // except that a nested class or member class template can be declared | ||||
15859 | // and then later defined. | ||||
15860 | if (TUK == TUK_Declaration && PrevDecl->isCXXClassMember() && | ||||
15861 | S->isDeclScope(PrevDecl)) { | ||||
15862 | Diag(NameLoc, diag::ext_member_redeclared); | ||||
15863 | Diag(PrevTagDecl->getLocation(), diag::note_previous_declaration); | ||||
15864 | } | ||||
15865 | |||||
15866 | if (!Invalid) { | ||||
15867 | // If this is a use, just return the declaration we found, unless | ||||
15868 | // we have attributes. | ||||
15869 | if (TUK == TUK_Reference || TUK == TUK_Friend) { | ||||
15870 | if (!Attrs.empty()) { | ||||
15871 | // FIXME: Diagnose these attributes. For now, we create a new | ||||
15872 | // declaration to hold them. | ||||
15873 | } else if (TUK == TUK_Reference && | ||||
15874 | (PrevTagDecl->getFriendObjectKind() == | ||||
15875 | Decl::FOK_Undeclared || | ||||
15876 | PrevDecl->getOwningModule() != getCurrentModule()) && | ||||
15877 | SS.isEmpty()) { | ||||
15878 | // This declaration is a reference to an existing entity, but | ||||
15879 | // has different visibility from that entity: it either makes | ||||
15880 | // a friend visible or it makes a type visible in a new module. | ||||
15881 | // In either case, create a new declaration. We only do this if | ||||
15882 | // the declaration would have meant the same thing if no prior | ||||
15883 | // declaration were found, that is, if it was found in the same | ||||
15884 | // scope where we would have injected a declaration. | ||||
15885 | if (!getTagInjectionContext(CurContext)->getRedeclContext() | ||||
15886 | ->Equals(PrevDecl->getDeclContext()->getRedeclContext())) | ||||
15887 | return PrevTagDecl; | ||||
15888 | // This is in the injected scope, create a new declaration in | ||||
15889 | // that scope. | ||||
15890 | S = getTagInjectionScope(S, getLangOpts()); | ||||
15891 | } else { | ||||
15892 | return PrevTagDecl; | ||||
15893 | } | ||||
15894 | } | ||||
15895 | |||||
15896 | // Diagnose attempts to redefine a tag. | ||||
15897 | if (TUK == TUK_Definition) { | ||||
15898 | if (NamedDecl *Def = PrevTagDecl->getDefinition()) { | ||||
15899 | // If we're defining a specialization and the previous definition | ||||
15900 | // is from an implicit instantiation, don't emit an error | ||||
15901 | // here; we'll catch this in the general case below. | ||||
15902 | bool IsExplicitSpecializationAfterInstantiation = false; | ||||
15903 | if (isMemberSpecialization) { | ||||
15904 | if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def)) | ||||
15905 | IsExplicitSpecializationAfterInstantiation = | ||||
15906 | RD->getTemplateSpecializationKind() != | ||||
15907 | TSK_ExplicitSpecialization; | ||||
15908 | else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def)) | ||||
15909 | IsExplicitSpecializationAfterInstantiation = | ||||
15910 | ED->getTemplateSpecializationKind() != | ||||
15911 | TSK_ExplicitSpecialization; | ||||
15912 | } | ||||
15913 | |||||
15914 | // Note that clang allows ODR-like semantics for ObjC/C, i.e., do | ||||
15915 | // not keep more that one definition around (merge them). However, | ||||
15916 | // ensure the decl passes the structural compatibility check in | ||||
15917 | // C11 6.2.7/1 (or 6.1.2.6/1 in C89). | ||||
15918 | NamedDecl *Hidden = nullptr; | ||||
15919 | if (SkipBody && !hasVisibleDefinition(Def, &Hidden)) { | ||||
15920 | // There is a definition of this tag, but it is not visible. We | ||||
15921 | // explicitly make use of C++'s one definition rule here, and | ||||
15922 | // assume that this definition is identical to the hidden one | ||||
15923 | // we already have. Make the existing definition visible and | ||||
15924 | // use it in place of this one. | ||||
15925 | if (!getLangOpts().CPlusPlus) { | ||||
15926 | // Postpone making the old definition visible until after we | ||||
15927 | // complete parsing the new one and do the structural | ||||
15928 | // comparison. | ||||
15929 | SkipBody->CheckSameAsPrevious = true; | ||||
15930 | SkipBody->New = createTagFromNewDecl(); | ||||
15931 | SkipBody->Previous = Def; | ||||
15932 | return Def; | ||||
15933 | } else { | ||||
15934 | SkipBody->ShouldSkip = true; | ||||
15935 | SkipBody->Previous = Def; | ||||
15936 | makeMergedDefinitionVisible(Hidden); | ||||
15937 | // Carry on and handle it like a normal definition. We'll | ||||
15938 | // skip starting the definitiion later. | ||||
15939 | } | ||||
15940 | } else if (!IsExplicitSpecializationAfterInstantiation) { | ||||
15941 | // A redeclaration in function prototype scope in C isn't | ||||
15942 | // visible elsewhere, so merely issue a warning. | ||||
15943 | if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope()) | ||||
15944 | Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name; | ||||
15945 | else | ||||
15946 | Diag(NameLoc, diag::err_redefinition) << Name; | ||||
15947 | notePreviousDefinition(Def, | ||||
15948 | NameLoc.isValid() ? NameLoc : KWLoc); | ||||
15949 | // If this is a redefinition, recover by making this | ||||
15950 | // struct be anonymous, which will make any later | ||||
15951 | // references get the previous definition. | ||||
15952 | Name = nullptr; | ||||
15953 | Previous.clear(); | ||||
15954 | Invalid = true; | ||||
15955 | } | ||||
15956 | } else { | ||||
15957 | // If the type is currently being defined, complain | ||||
15958 | // about a nested redefinition. | ||||
15959 | auto *TD = Context.getTagDeclType(PrevTagDecl)->getAsTagDecl(); | ||||
15960 | if (TD->isBeingDefined()) { | ||||
15961 | Diag(NameLoc, diag::err_nested_redefinition) << Name; | ||||
15962 | Diag(PrevTagDecl->getLocation(), | ||||
15963 | diag::note_previous_definition); | ||||
15964 | Name = nullptr; | ||||
15965 | Previous.clear(); | ||||
15966 | Invalid = true; | ||||
15967 | } | ||||
15968 | } | ||||
15969 | |||||
15970 | // Okay, this is definition of a previously declared or referenced | ||||
15971 | // tag. We're going to create a new Decl for it. | ||||
15972 | } | ||||
15973 | |||||
15974 | // Okay, we're going to make a redeclaration. If this is some kind | ||||
15975 | // of reference, make sure we build the redeclaration in the same DC | ||||
15976 | // as the original, and ignore the current access specifier. | ||||
15977 | if (TUK == TUK_Friend || TUK == TUK_Reference) { | ||||
15978 | SearchDC = PrevTagDecl->getDeclContext(); | ||||
15979 | AS = AS_none; | ||||
15980 | } | ||||
15981 | } | ||||
15982 | // If we get here we have (another) forward declaration or we | ||||
15983 | // have a definition. Just create a new decl. | ||||
15984 | |||||
15985 | } else { | ||||
15986 | // If we get here, this is a definition of a new tag type in a nested | ||||
15987 | // scope, e.g. "struct foo; void bar() { struct foo; }", just create a | ||||
15988 | // new decl/type. We set PrevDecl to NULL so that the entities | ||||
15989 | // have distinct types. | ||||
15990 | Previous.clear(); | ||||
15991 | } | ||||
15992 | // If we get here, we're going to create a new Decl. If PrevDecl | ||||
15993 | // is non-NULL, it's a definition of the tag declared by | ||||
15994 | // PrevDecl. If it's NULL, we have a new definition. | ||||
15995 | |||||
15996 | // Otherwise, PrevDecl is not a tag, but was found with tag | ||||
15997 | // lookup. This is only actually possible in C++, where a few | ||||
15998 | // things like templates still live in the tag namespace. | ||||
15999 | } else { | ||||
16000 | // Use a better diagnostic if an elaborated-type-specifier | ||||
16001 | // found the wrong kind of type on the first | ||||
16002 | // (non-redeclaration) lookup. | ||||
16003 | if ((TUK == TUK_Reference || TUK == TUK_Friend) && | ||||
16004 | !Previous.isForRedeclaration()) { | ||||
16005 | NonTagKind NTK = getNonTagTypeDeclKind(PrevDecl, Kind); | ||||
16006 | Diag(NameLoc, diag::err_tag_reference_non_tag) << PrevDecl << NTK | ||||
16007 | << Kind; | ||||
16008 | Diag(PrevDecl->getLocation(), diag::note_declared_at); | ||||
16009 | Invalid = true; | ||||
16010 | |||||
16011 | // Otherwise, only diagnose if the declaration is in scope. | ||||
16012 | } else if (!isDeclInScope(DirectPrevDecl, SearchDC, S, | ||||
16013 | SS.isNotEmpty() || isMemberSpecialization)) { | ||||
16014 | // do nothing | ||||
16015 | |||||
16016 | // Diagnose implicit declarations introduced by elaborated types. | ||||
16017 | } else if (TUK == TUK_Reference || TUK == TUK_Friend) { | ||||
16018 | NonTagKind NTK = getNonTagTypeDeclKind(PrevDecl, Kind); | ||||
16019 | Diag(NameLoc, diag::err_tag_reference_conflict) << NTK; | ||||
16020 | Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; | ||||
16021 | Invalid = true; | ||||
16022 | |||||
16023 | // Otherwise it's a declaration. Call out a particularly common | ||||
16024 | // case here. | ||||
16025 | } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { | ||||
16026 | unsigned Kind = 0; | ||||
16027 | if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; | ||||
16028 | Diag(NameLoc, diag::err_tag_definition_of_typedef) | ||||
16029 | << Name << Kind << TND->getUnderlyingType(); | ||||
16030 | Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; | ||||
16031 | Invalid = true; | ||||
16032 | |||||
16033 | // Otherwise, diagnose. | ||||
16034 | } else { | ||||
16035 | // The tag name clashes with something else in the target scope, | ||||
16036 | // issue an error and recover by making this tag be anonymous. | ||||
16037 | Diag(NameLoc, diag::err_redefinition_different_kind) << Name; | ||||
16038 | notePreviousDefinition(PrevDecl, NameLoc); | ||||
16039 | Name = nullptr; | ||||
16040 | Invalid = true; | ||||
16041 | } | ||||
16042 | |||||
16043 | // The existing declaration isn't relevant to us; we're in a | ||||
16044 | // new scope, so clear out the previous declaration. | ||||
16045 | Previous.clear(); | ||||
16046 | } | ||||
16047 | } | ||||
16048 | |||||
16049 | CreateNewDecl: | ||||
16050 | |||||
16051 | TagDecl *PrevDecl = nullptr; | ||||
16052 | if (Previous.isSingleResult()) | ||||
16053 | PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); | ||||
16054 | |||||
16055 | // If there is an identifier, use the location of the identifier as the | ||||
16056 | // location of the decl, otherwise use the location of the struct/union | ||||
16057 | // keyword. | ||||
16058 | SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; | ||||
16059 | |||||
16060 | // Otherwise, create a new declaration. If there is a previous | ||||
16061 | // declaration of the same entity, the two will be linked via | ||||
16062 | // PrevDecl. | ||||
16063 | TagDecl *New; | ||||
16064 | |||||
16065 | if (Kind == TTK_Enum) { | ||||
16066 | // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: | ||||
16067 | // enum X { A, B, C } D; D should chain to X. | ||||
16068 | New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, | ||||
16069 | cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, | ||||
16070 | ScopedEnumUsesClassTag, IsFixed); | ||||
16071 | |||||
16072 | if (isStdAlignValT && (!StdAlignValT || getStdAlignValT()->isImplicit())) | ||||
16073 | StdAlignValT = cast<EnumDecl>(New); | ||||
16074 | |||||
16075 | // If this is an undefined enum, warn. | ||||
16076 | if (TUK != TUK_Definition && !Invalid) { | ||||
16077 | TagDecl *Def; | ||||
16078 | if (IsFixed && cast<EnumDecl>(New)->isFixed()) { | ||||
16079 | // C++0x: 7.2p2: opaque-enum-declaration. | ||||
16080 | // Conflicts are diagnosed above. Do nothing. | ||||
16081 | } | ||||
16082 | else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { | ||||
16083 | Diag(Loc, diag::ext_forward_ref_enum_def) | ||||
16084 | << New; | ||||
16085 | Diag(Def->getLocation(), diag::note_previous_definition); | ||||
16086 | } else { | ||||
16087 | unsigned DiagID = diag::ext_forward_ref_enum; | ||||
16088 | if (getLangOpts().MSVCCompat) | ||||
16089 | DiagID = diag::ext_ms_forward_ref_enum; | ||||
16090 | else if (getLangOpts().CPlusPlus) | ||||
16091 | DiagID = diag::err_forward_ref_enum; | ||||
16092 | Diag(Loc, DiagID); | ||||
16093 | } | ||||
16094 | } | ||||
16095 | |||||
16096 | if (EnumUnderlying) { | ||||
16097 | EnumDecl *ED = cast<EnumDecl>(New); | ||||
16098 | if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) | ||||
16099 | ED->setIntegerTypeSourceInfo(TI); | ||||
16100 | else | ||||
16101 | ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); | ||||
16102 | ED->setPromotionType(ED->getIntegerType()); | ||||
16103 | assert(ED->isComplete() && "enum with type should be complete")((ED->isComplete() && "enum with type should be complete" ) ? static_cast<void> (0) : __assert_fail ("ED->isComplete() && \"enum with type should be complete\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16103, __PRETTY_FUNCTION__)); | ||||
16104 | } | ||||
16105 | } else { | ||||
16106 | // struct/union/class | ||||
16107 | |||||
16108 | // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: | ||||
16109 | // struct X { int A; } D; D should chain to X. | ||||
16110 | if (getLangOpts().CPlusPlus) { | ||||
16111 | // FIXME: Look for a way to use RecordDecl for simple structs. | ||||
16112 | New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, | ||||
16113 | cast_or_null<CXXRecordDecl>(PrevDecl)); | ||||
16114 | |||||
16115 | if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) | ||||
16116 | StdBadAlloc = cast<CXXRecordDecl>(New); | ||||
16117 | } else | ||||
16118 | New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, | ||||
16119 | cast_or_null<RecordDecl>(PrevDecl)); | ||||
16120 | } | ||||
16121 | |||||
16122 | // C++11 [dcl.type]p3: | ||||
16123 | // A type-specifier-seq shall not define a class or enumeration [...]. | ||||
16124 | if (getLangOpts().CPlusPlus && (IsTypeSpecifier || IsTemplateParamOrArg) && | ||||
16125 | TUK == TUK_Definition) { | ||||
16126 | Diag(New->getLocation(), diag::err_type_defined_in_type_specifier) | ||||
16127 | << Context.getTagDeclType(New); | ||||
16128 | Invalid = true; | ||||
16129 | } | ||||
16130 | |||||
16131 | if (!Invalid && getLangOpts().CPlusPlus && TUK == TUK_Definition && | ||||
16132 | DC->getDeclKind() == Decl::Enum) { | ||||
16133 | Diag(New->getLocation(), diag::err_type_defined_in_enum) | ||||
16134 | << Context.getTagDeclType(New); | ||||
16135 | Invalid = true; | ||||
16136 | } | ||||
16137 | |||||
16138 | // Maybe add qualifier info. | ||||
16139 | if (SS.isNotEmpty()) { | ||||
16140 | if (SS.isSet()) { | ||||
16141 | // If this is either a declaration or a definition, check the | ||||
16142 | // nested-name-specifier against the current context. | ||||
16143 | if ((TUK == TUK_Definition || TUK == TUK_Declaration) && | ||||
16144 | diagnoseQualifiedDeclaration(SS, DC, OrigName, Loc, | ||||
16145 | isMemberSpecialization)) | ||||
16146 | Invalid = true; | ||||
16147 | |||||
16148 | New->setQualifierInfo(SS.getWithLocInContext(Context)); | ||||
16149 | if (TemplateParameterLists.size() > 0) { | ||||
16150 | New->setTemplateParameterListsInfo(Context, TemplateParameterLists); | ||||
16151 | } | ||||
16152 | } | ||||
16153 | else | ||||
16154 | Invalid = true; | ||||
16155 | } | ||||
16156 | |||||
16157 | if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { | ||||
16158 | // Add alignment attributes if necessary; these attributes are checked when | ||||
16159 | // the ASTContext lays out the structure. | ||||
16160 | // | ||||
16161 | // It is important for implementing the correct semantics that this | ||||
16162 | // happen here (in ActOnTag). The #pragma pack stack is | ||||
16163 | // maintained as a result of parser callbacks which can occur at | ||||
16164 | // many points during the parsing of a struct declaration (because | ||||
16165 | // the #pragma tokens are effectively skipped over during the | ||||
16166 | // parsing of the struct). | ||||
16167 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) { | ||||
16168 | AddAlignmentAttributesForRecord(RD); | ||||
16169 | AddMsStructLayoutForRecord(RD); | ||||
16170 | } | ||||
16171 | } | ||||
16172 | |||||
16173 | if (ModulePrivateLoc.isValid()) { | ||||
16174 | if (isMemberSpecialization) | ||||
16175 | Diag(New->getLocation(), diag::err_module_private_specialization) | ||||
16176 | << 2 | ||||
16177 | << FixItHint::CreateRemoval(ModulePrivateLoc); | ||||
16178 | // __module_private__ does not apply to local classes. However, we only | ||||
16179 | // diagnose this as an error when the declaration specifiers are | ||||
16180 | // freestanding. Here, we just ignore the __module_private__. | ||||
16181 | else if (!SearchDC->isFunctionOrMethod()) | ||||
16182 | New->setModulePrivate(); | ||||
16183 | } | ||||
16184 | |||||
16185 | // If this is a specialization of a member class (of a class template), | ||||
16186 | // check the specialization. | ||||
16187 | if (isMemberSpecialization && CheckMemberSpecialization(New, Previous)) | ||||
16188 | Invalid = true; | ||||
16189 | |||||
16190 | // If we're declaring or defining a tag in function prototype scope in C, | ||||
16191 | // note that this type can only be used within the function and add it to | ||||
16192 | // the list of decls to inject into the function definition scope. | ||||
16193 | if ((Name || Kind == TTK_Enum) && | ||||
16194 | getNonFieldDeclScope(S)->isFunctionPrototypeScope()) { | ||||
16195 | if (getLangOpts().CPlusPlus) { | ||||
16196 | // C++ [dcl.fct]p6: | ||||
16197 | // Types shall not be defined in return or parameter types. | ||||
16198 | if (TUK == TUK_Definition && !IsTypeSpecifier) { | ||||
16199 | Diag(Loc, diag::err_type_defined_in_param_type) | ||||
16200 | << Name; | ||||
16201 | Invalid = true; | ||||
16202 | } | ||||
16203 | } else if (!PrevDecl) { | ||||
16204 | Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); | ||||
16205 | } | ||||
16206 | } | ||||
16207 | |||||
16208 | if (Invalid) | ||||
16209 | New->setInvalidDecl(); | ||||
16210 | |||||
16211 | // Set the lexical context. If the tag has a C++ scope specifier, the | ||||
16212 | // lexical context will be different from the semantic context. | ||||
16213 | New->setLexicalDeclContext(CurContext); | ||||
16214 | |||||
16215 | // Mark this as a friend decl if applicable. | ||||
16216 | // In Microsoft mode, a friend declaration also acts as a forward | ||||
16217 | // declaration so we always pass true to setObjectOfFriendDecl to make | ||||
16218 | // the tag name visible. | ||||
16219 | if (TUK == TUK_Friend) | ||||
16220 | New->setObjectOfFriendDecl(getLangOpts().MSVCCompat); | ||||
16221 | |||||
16222 | // Set the access specifier. | ||||
16223 | if (!Invalid && SearchDC->isRecord()) | ||||
16224 | SetMemberAccessSpecifier(New, PrevDecl, AS); | ||||
16225 | |||||
16226 | if (PrevDecl) | ||||
16227 | CheckRedeclarationModuleOwnership(New, PrevDecl); | ||||
16228 | |||||
16229 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) | ||||
16230 | New->startDefinition(); | ||||
16231 | |||||
16232 | ProcessDeclAttributeList(S, New, Attrs); | ||||
16233 | AddPragmaAttributes(S, New); | ||||
16234 | |||||
16235 | // If this has an identifier, add it to the scope stack. | ||||
16236 | if (TUK == TUK_Friend) { | ||||
16237 | // We might be replacing an existing declaration in the lookup tables; | ||||
16238 | // if so, borrow its access specifier. | ||||
16239 | if (PrevDecl) | ||||
16240 | New->setAccess(PrevDecl->getAccess()); | ||||
16241 | |||||
16242 | DeclContext *DC = New->getDeclContext()->getRedeclContext(); | ||||
16243 | DC->makeDeclVisibleInContext(New); | ||||
16244 | if (Name) // can be null along some error paths | ||||
16245 | if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) | ||||
16246 | PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); | ||||
16247 | } else if (Name) { | ||||
16248 | S = getNonFieldDeclScope(S); | ||||
16249 | PushOnScopeChains(New, S, true); | ||||
16250 | } else { | ||||
16251 | CurContext->addDecl(New); | ||||
16252 | } | ||||
16253 | |||||
16254 | // If this is the C FILE type, notify the AST context. | ||||
16255 | if (IdentifierInfo *II = New->getIdentifier()) | ||||
16256 | if (!New->isInvalidDecl() && | ||||
16257 | New->getDeclContext()->getRedeclContext()->isTranslationUnit() && | ||||
16258 | II->isStr("FILE")) | ||||
16259 | Context.setFILEDecl(New); | ||||
16260 | |||||
16261 | if (PrevDecl) | ||||
16262 | mergeDeclAttributes(New, PrevDecl); | ||||
16263 | |||||
16264 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(New)) | ||||
16265 | inferGslOwnerPointerAttribute(CXXRD); | ||||
16266 | |||||
16267 | // If there's a #pragma GCC visibility in scope, set the visibility of this | ||||
16268 | // record. | ||||
16269 | AddPushedVisibilityAttribute(New); | ||||
16270 | |||||
16271 | if (isMemberSpecialization && !New->isInvalidDecl()) | ||||
16272 | CompleteMemberSpecialization(New, Previous); | ||||
16273 | |||||
16274 | OwnedDecl = true; | ||||
16275 | // In C++, don't return an invalid declaration. We can't recover well from | ||||
16276 | // the cases where we make the type anonymous. | ||||
16277 | if (Invalid && getLangOpts().CPlusPlus) { | ||||
16278 | if (New->isBeingDefined()) | ||||
16279 | if (auto RD = dyn_cast<RecordDecl>(New)) | ||||
16280 | RD->completeDefinition(); | ||||
16281 | return nullptr; | ||||
16282 | } else if (SkipBody && SkipBody->ShouldSkip) { | ||||
16283 | return SkipBody->Previous; | ||||
16284 | } else { | ||||
16285 | return New; | ||||
16286 | } | ||||
16287 | } | ||||
16288 | |||||
16289 | void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { | ||||
16290 | AdjustDeclIfTemplate(TagD); | ||||
16291 | TagDecl *Tag = cast<TagDecl>(TagD); | ||||
16292 | |||||
16293 | // Enter the tag context. | ||||
16294 | PushDeclContext(S, Tag); | ||||
16295 | |||||
16296 | ActOnDocumentableDecl(TagD); | ||||
16297 | |||||
16298 | // If there's a #pragma GCC visibility in scope, set the visibility of this | ||||
16299 | // record. | ||||
16300 | AddPushedVisibilityAttribute(Tag); | ||||
16301 | } | ||||
16302 | |||||
16303 | bool Sema::ActOnDuplicateDefinition(DeclSpec &DS, Decl *Prev, | ||||
16304 | SkipBodyInfo &SkipBody) { | ||||
16305 | if (!hasStructuralCompatLayout(Prev, SkipBody.New)) | ||||
16306 | return false; | ||||
16307 | |||||
16308 | // Make the previous decl visible. | ||||
16309 | makeMergedDefinitionVisible(SkipBody.Previous); | ||||
16310 | return true; | ||||
16311 | } | ||||
16312 | |||||
16313 | Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { | ||||
16314 | assert(isa<ObjCContainerDecl>(IDecl) &&((isa<ObjCContainerDecl>(IDecl) && "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl" ) ? static_cast<void> (0) : __assert_fail ("isa<ObjCContainerDecl>(IDecl) && \"ActOnObjCContainerStartDefinition - Not ObjCContainerDecl\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16315, __PRETTY_FUNCTION__)) | ||||
16315 | "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl")((isa<ObjCContainerDecl>(IDecl) && "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl" ) ? static_cast<void> (0) : __assert_fail ("isa<ObjCContainerDecl>(IDecl) && \"ActOnObjCContainerStartDefinition - Not ObjCContainerDecl\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16315, __PRETTY_FUNCTION__)); | ||||
16316 | DeclContext *OCD = cast<DeclContext>(IDecl); | ||||
16317 | assert(OCD->getLexicalParent() == CurContext &&((OCD->getLexicalParent() == CurContext && "The next DeclContext should be lexically contained in the current one." ) ? static_cast<void> (0) : __assert_fail ("OCD->getLexicalParent() == CurContext && \"The next DeclContext should be lexically contained in the current one.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16318, __PRETTY_FUNCTION__)) | ||||
16318 | "The next DeclContext should be lexically contained in the current one.")((OCD->getLexicalParent() == CurContext && "The next DeclContext should be lexically contained in the current one." ) ? static_cast<void> (0) : __assert_fail ("OCD->getLexicalParent() == CurContext && \"The next DeclContext should be lexically contained in the current one.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16318, __PRETTY_FUNCTION__)); | ||||
16319 | CurContext = OCD; | ||||
16320 | return IDecl; | ||||
16321 | } | ||||
16322 | |||||
16323 | void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, | ||||
16324 | SourceLocation FinalLoc, | ||||
16325 | bool IsFinalSpelledSealed, | ||||
16326 | SourceLocation LBraceLoc) { | ||||
16327 | AdjustDeclIfTemplate(TagD); | ||||
16328 | CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); | ||||
16329 | |||||
16330 | FieldCollector->StartClass(); | ||||
16331 | |||||
16332 | if (!Record->getIdentifier()) | ||||
16333 | return; | ||||
16334 | |||||
16335 | if (FinalLoc.isValid()) | ||||
16336 | Record->addAttr(FinalAttr::Create( | ||||
16337 | Context, FinalLoc, AttributeCommonInfo::AS_Keyword, | ||||
16338 | static_cast<FinalAttr::Spelling>(IsFinalSpelledSealed))); | ||||
16339 | |||||
16340 | // C++ [class]p2: | ||||
16341 | // [...] The class-name is also inserted into the scope of the | ||||
16342 | // class itself; this is known as the injected-class-name. For | ||||
16343 | // purposes of access checking, the injected-class-name is treated | ||||
16344 | // as if it were a public member name. | ||||
16345 | CXXRecordDecl *InjectedClassName = CXXRecordDecl::Create( | ||||
16346 | Context, Record->getTagKind(), CurContext, Record->getBeginLoc(), | ||||
16347 | Record->getLocation(), Record->getIdentifier(), | ||||
16348 | /*PrevDecl=*/nullptr, | ||||
16349 | /*DelayTypeCreation=*/true); | ||||
16350 | Context.getTypeDeclType(InjectedClassName, Record); | ||||
16351 | InjectedClassName->setImplicit(); | ||||
16352 | InjectedClassName->setAccess(AS_public); | ||||
16353 | if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) | ||||
16354 | InjectedClassName->setDescribedClassTemplate(Template); | ||||
16355 | PushOnScopeChains(InjectedClassName, S); | ||||
16356 | assert(InjectedClassName->isInjectedClassName() &&((InjectedClassName->isInjectedClassName() && "Broken injected-class-name" ) ? static_cast<void> (0) : __assert_fail ("InjectedClassName->isInjectedClassName() && \"Broken injected-class-name\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16357, __PRETTY_FUNCTION__)) | ||||
16357 | "Broken injected-class-name")((InjectedClassName->isInjectedClassName() && "Broken injected-class-name" ) ? static_cast<void> (0) : __assert_fail ("InjectedClassName->isInjectedClassName() && \"Broken injected-class-name\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16357, __PRETTY_FUNCTION__)); | ||||
16358 | } | ||||
16359 | |||||
16360 | void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, | ||||
16361 | SourceRange BraceRange) { | ||||
16362 | AdjustDeclIfTemplate(TagD); | ||||
16363 | TagDecl *Tag = cast<TagDecl>(TagD); | ||||
16364 | Tag->setBraceRange(BraceRange); | ||||
16365 | |||||
16366 | // Make sure we "complete" the definition even it is invalid. | ||||
16367 | if (Tag->isBeingDefined()) { | ||||
16368 | assert(Tag->isInvalidDecl() && "We should already have completed it")((Tag->isInvalidDecl() && "We should already have completed it" ) ? static_cast<void> (0) : __assert_fail ("Tag->isInvalidDecl() && \"We should already have completed it\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16368, __PRETTY_FUNCTION__)); | ||||
16369 | if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) | ||||
16370 | RD->completeDefinition(); | ||||
16371 | } | ||||
16372 | |||||
16373 | if (isa<CXXRecordDecl>(Tag)) { | ||||
16374 | FieldCollector->FinishClass(); | ||||
16375 | } | ||||
16376 | |||||
16377 | // Exit this scope of this tag's definition. | ||||
16378 | PopDeclContext(); | ||||
16379 | |||||
16380 | if (getCurLexicalContext()->isObjCContainer() && | ||||
16381 | Tag->getDeclContext()->isFileContext()) | ||||
16382 | Tag->setTopLevelDeclInObjCContainer(); | ||||
16383 | |||||
16384 | // Notify the consumer that we've defined a tag. | ||||
16385 | if (!Tag->isInvalidDecl()) | ||||
16386 | Consumer.HandleTagDeclDefinition(Tag); | ||||
16387 | } | ||||
16388 | |||||
16389 | void Sema::ActOnObjCContainerFinishDefinition() { | ||||
16390 | // Exit this scope of this interface definition. | ||||
16391 | PopDeclContext(); | ||||
16392 | } | ||||
16393 | |||||
16394 | void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { | ||||
16395 | assert(DC == CurContext && "Mismatch of container contexts")((DC == CurContext && "Mismatch of container contexts" ) ? static_cast<void> (0) : __assert_fail ("DC == CurContext && \"Mismatch of container contexts\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16395, __PRETTY_FUNCTION__)); | ||||
16396 | OriginalLexicalContext = DC; | ||||
16397 | ActOnObjCContainerFinishDefinition(); | ||||
16398 | } | ||||
16399 | |||||
16400 | void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { | ||||
16401 | ActOnObjCContainerStartDefinition(cast<Decl>(DC)); | ||||
16402 | OriginalLexicalContext = nullptr; | ||||
16403 | } | ||||
16404 | |||||
16405 | void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { | ||||
16406 | AdjustDeclIfTemplate(TagD); | ||||
16407 | TagDecl *Tag = cast<TagDecl>(TagD); | ||||
16408 | Tag->setInvalidDecl(); | ||||
16409 | |||||
16410 | // Make sure we "complete" the definition even it is invalid. | ||||
16411 | if (Tag->isBeingDefined()) { | ||||
16412 | if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) | ||||
16413 | RD->completeDefinition(); | ||||
16414 | } | ||||
16415 | |||||
16416 | // We're undoing ActOnTagStartDefinition here, not | ||||
16417 | // ActOnStartCXXMemberDeclarations, so we don't have to mess with | ||||
16418 | // the FieldCollector. | ||||
16419 | |||||
16420 | PopDeclContext(); | ||||
16421 | } | ||||
16422 | |||||
16423 | // Note that FieldName may be null for anonymous bitfields. | ||||
16424 | ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, | ||||
16425 | IdentifierInfo *FieldName, | ||||
16426 | QualType FieldTy, bool IsMsStruct, | ||||
16427 | Expr *BitWidth, bool *ZeroWidth) { | ||||
16428 | assert(BitWidth)((BitWidth) ? static_cast<void> (0) : __assert_fail ("BitWidth" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16428, __PRETTY_FUNCTION__)); | ||||
16429 | if (BitWidth->containsErrors()) | ||||
16430 | return ExprError(); | ||||
16431 | |||||
16432 | // Default to true; that shouldn't confuse checks for emptiness | ||||
16433 | if (ZeroWidth) | ||||
16434 | *ZeroWidth = true; | ||||
16435 | |||||
16436 | // C99 6.7.2.1p4 - verify the field type. | ||||
16437 | // C++ 9.6p3: A bit-field shall have integral or enumeration type. | ||||
16438 | if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { | ||||
16439 | // Handle incomplete and sizeless types with a specific error. | ||||
16440 | if (RequireCompleteSizedType(FieldLoc, FieldTy, | ||||
16441 | diag::err_field_incomplete_or_sizeless)) | ||||
16442 | return ExprError(); | ||||
16443 | if (FieldName) | ||||
16444 | return Diag(FieldLoc, diag::err_not_integral_type_bitfield) | ||||
16445 | << FieldName << FieldTy << BitWidth->getSourceRange(); | ||||
16446 | return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) | ||||
16447 | << FieldTy << BitWidth->getSourceRange(); | ||||
16448 | } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), | ||||
16449 | UPPC_BitFieldWidth)) | ||||
16450 | return ExprError(); | ||||
16451 | |||||
16452 | // If the bit-width is type- or value-dependent, don't try to check | ||||
16453 | // it now. | ||||
16454 | if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) | ||||
16455 | return BitWidth; | ||||
16456 | |||||
16457 | llvm::APSInt Value; | ||||
16458 | ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value, AllowFold); | ||||
16459 | if (ICE.isInvalid()) | ||||
16460 | return ICE; | ||||
16461 | BitWidth = ICE.get(); | ||||
16462 | |||||
16463 | if (Value != 0 && ZeroWidth) | ||||
16464 | *ZeroWidth = false; | ||||
16465 | |||||
16466 | // Zero-width bitfield is ok for anonymous field. | ||||
16467 | if (Value == 0 && FieldName) | ||||
16468 | return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; | ||||
16469 | |||||
16470 | if (Value.isSigned() && Value.isNegative()) { | ||||
16471 | if (FieldName) | ||||
16472 | return Diag(FieldLoc, diag::err_bitfield_has_negative_width) | ||||
16473 | << FieldName << Value.toString(10); | ||||
16474 | return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) | ||||
16475 | << Value.toString(10); | ||||
16476 | } | ||||
16477 | |||||
16478 | // The size of the bit-field must not exceed our maximum permitted object | ||||
16479 | // size. | ||||
16480 | if (Value.getActiveBits() > ConstantArrayType::getMaxSizeBits(Context)) { | ||||
16481 | return Diag(FieldLoc, diag::err_bitfield_too_wide) | ||||
16482 | << !FieldName << FieldName << Value.toString(10); | ||||
16483 | } | ||||
16484 | |||||
16485 | if (!FieldTy->isDependentType()) { | ||||
16486 | uint64_t TypeStorageSize = Context.getTypeSize(FieldTy); | ||||
16487 | uint64_t TypeWidth = Context.getIntWidth(FieldTy); | ||||
16488 | bool BitfieldIsOverwide = Value.ugt(TypeWidth); | ||||
16489 | |||||
16490 | // Over-wide bitfields are an error in C or when using the MSVC bitfield | ||||
16491 | // ABI. | ||||
16492 | bool CStdConstraintViolation = | ||||
16493 | BitfieldIsOverwide && !getLangOpts().CPlusPlus; | ||||
16494 | bool MSBitfieldViolation = | ||||
16495 | Value.ugt(TypeStorageSize) && | ||||
16496 | (IsMsStruct || Context.getTargetInfo().getCXXABI().isMicrosoft()); | ||||
16497 | if (CStdConstraintViolation || MSBitfieldViolation) { | ||||
16498 | unsigned DiagWidth = | ||||
16499 | CStdConstraintViolation ? TypeWidth : TypeStorageSize; | ||||
16500 | if (FieldName) | ||||
16501 | return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_width) | ||||
16502 | << FieldName << Value.toString(10) | ||||
16503 | << !CStdConstraintViolation << DiagWidth; | ||||
16504 | |||||
16505 | return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_width) | ||||
16506 | << Value.toString(10) << !CStdConstraintViolation | ||||
16507 | << DiagWidth; | ||||
16508 | } | ||||
16509 | |||||
16510 | // Warn on types where the user might conceivably expect to get all | ||||
16511 | // specified bits as value bits: that's all integral types other than | ||||
16512 | // 'bool'. | ||||
16513 | if (BitfieldIsOverwide && !FieldTy->isBooleanType() && FieldName) { | ||||
16514 | Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_width) | ||||
16515 | << FieldName << Value.toString(10) | ||||
16516 | << (unsigned)TypeWidth; | ||||
16517 | } | ||||
16518 | } | ||||
16519 | |||||
16520 | return BitWidth; | ||||
16521 | } | ||||
16522 | |||||
16523 | /// ActOnField - Each field of a C struct/union is passed into this in order | ||||
16524 | /// to create a FieldDecl object for it. | ||||
16525 | Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, | ||||
16526 | Declarator &D, Expr *BitfieldWidth) { | ||||
16527 | FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), | ||||
16528 | DeclStart, D, static_cast<Expr*>(BitfieldWidth), | ||||
16529 | /*InitStyle=*/ICIS_NoInit, AS_public); | ||||
16530 | return Res; | ||||
16531 | } | ||||
16532 | |||||
16533 | /// HandleField - Analyze a field of a C struct or a C++ data member. | ||||
16534 | /// | ||||
16535 | FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, | ||||
16536 | SourceLocation DeclStart, | ||||
16537 | Declarator &D, Expr *BitWidth, | ||||
16538 | InClassInitStyle InitStyle, | ||||
16539 | AccessSpecifier AS) { | ||||
16540 | if (D.isDecompositionDeclarator()) { | ||||
16541 | const DecompositionDeclarator &Decomp = D.getDecompositionDeclarator(); | ||||
16542 | Diag(Decomp.getLSquareLoc(), diag::err_decomp_decl_context) | ||||
16543 | << Decomp.getSourceRange(); | ||||
16544 | return nullptr; | ||||
16545 | } | ||||
16546 | |||||
16547 | IdentifierInfo *II = D.getIdentifier(); | ||||
16548 | SourceLocation Loc = DeclStart; | ||||
16549 | if (II) Loc = D.getIdentifierLoc(); | ||||
16550 | |||||
16551 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); | ||||
16552 | QualType T = TInfo->getType(); | ||||
16553 | if (getLangOpts().CPlusPlus) { | ||||
16554 | CheckExtraCXXDefaultArguments(D); | ||||
16555 | |||||
16556 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, | ||||
16557 | UPPC_DataMemberType)) { | ||||
16558 | D.setInvalidType(); | ||||
16559 | T = Context.IntTy; | ||||
16560 | TInfo = Context.getTrivialTypeSourceInfo(T, Loc); | ||||
16561 | } | ||||
16562 | } | ||||
16563 | |||||
16564 | DiagnoseFunctionSpecifiers(D.getDeclSpec()); | ||||
16565 | |||||
16566 | if (D.getDeclSpec().isInlineSpecified()) | ||||
16567 | Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function) | ||||
16568 | << getLangOpts().CPlusPlus17; | ||||
16569 | if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) | ||||
16570 | Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), | ||||
16571 | diag::err_invalid_thread) | ||||
16572 | << DeclSpec::getSpecifierName(TSCS); | ||||
16573 | |||||
16574 | // Check to see if this name was declared as a member previously | ||||
16575 | NamedDecl *PrevDecl = nullptr; | ||||
16576 | LookupResult Previous(*this, II, Loc, LookupMemberName, | ||||
16577 | ForVisibleRedeclaration); | ||||
16578 | LookupName(Previous, S); | ||||
16579 | switch (Previous.getResultKind()) { | ||||
16580 | case LookupResult::Found: | ||||
16581 | case LookupResult::FoundUnresolvedValue: | ||||
16582 | PrevDecl = Previous.getAsSingle<NamedDecl>(); | ||||
16583 | break; | ||||
16584 | |||||
16585 | case LookupResult::FoundOverloaded: | ||||
16586 | PrevDecl = Previous.getRepresentativeDecl(); | ||||
16587 | break; | ||||
16588 | |||||
16589 | case LookupResult::NotFound: | ||||
16590 | case LookupResult::NotFoundInCurrentInstantiation: | ||||
16591 | case LookupResult::Ambiguous: | ||||
16592 | break; | ||||
16593 | } | ||||
16594 | Previous.suppressDiagnostics(); | ||||
16595 | |||||
16596 | if (PrevDecl && PrevDecl->isTemplateParameter()) { | ||||
16597 | // Maybe we will complain about the shadowed template parameter. | ||||
16598 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); | ||||
16599 | // Just pretend that we didn't see the previous declaration. | ||||
16600 | PrevDecl = nullptr; | ||||
16601 | } | ||||
16602 | |||||
16603 | if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) | ||||
16604 | PrevDecl = nullptr; | ||||
16605 | |||||
16606 | bool Mutable | ||||
16607 | = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); | ||||
16608 | SourceLocation TSSL = D.getBeginLoc(); | ||||
16609 | FieldDecl *NewFD | ||||
16610 | = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, InitStyle, | ||||
16611 | TSSL, AS, PrevDecl, &D); | ||||
16612 | |||||
16613 | if (NewFD->isInvalidDecl()) | ||||
16614 | Record->setInvalidDecl(); | ||||
16615 | |||||
16616 | if (D.getDeclSpec().isModulePrivateSpecified()) | ||||
16617 | NewFD->setModulePrivate(); | ||||
16618 | |||||
16619 | if (NewFD->isInvalidDecl() && PrevDecl) { | ||||
16620 | // Don't introduce NewFD into scope; there's already something | ||||
16621 | // with the same name in the same scope. | ||||
16622 | } else if (II) { | ||||
16623 | PushOnScopeChains(NewFD, S); | ||||
16624 | } else | ||||
16625 | Record->addDecl(NewFD); | ||||
16626 | |||||
16627 | return NewFD; | ||||
16628 | } | ||||
16629 | |||||
16630 | /// Build a new FieldDecl and check its well-formedness. | ||||
16631 | /// | ||||
16632 | /// This routine builds a new FieldDecl given the fields name, type, | ||||
16633 | /// record, etc. \p PrevDecl should refer to any previous declaration | ||||
16634 | /// with the same name and in the same scope as the field to be | ||||
16635 | /// created. | ||||
16636 | /// | ||||
16637 | /// \returns a new FieldDecl. | ||||
16638 | /// | ||||
16639 | /// \todo The Declarator argument is a hack. It will be removed once | ||||
16640 | FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, | ||||
16641 | TypeSourceInfo *TInfo, | ||||
16642 | RecordDecl *Record, SourceLocation Loc, | ||||
16643 | bool Mutable, Expr *BitWidth, | ||||
16644 | InClassInitStyle InitStyle, | ||||
16645 | SourceLocation TSSL, | ||||
16646 | AccessSpecifier AS, NamedDecl *PrevDecl, | ||||
16647 | Declarator *D) { | ||||
16648 | IdentifierInfo *II = Name.getAsIdentifierInfo(); | ||||
16649 | bool InvalidDecl = false; | ||||
16650 | if (D) InvalidDecl = D->isInvalidType(); | ||||
16651 | |||||
16652 | // If we receive a broken type, recover by assuming 'int' and | ||||
16653 | // marking this declaration as invalid. | ||||
16654 | if (T.isNull() || T->containsErrors()) { | ||||
16655 | InvalidDecl = true; | ||||
16656 | T = Context.IntTy; | ||||
16657 | } | ||||
16658 | |||||
16659 | QualType EltTy = Context.getBaseElementType(T); | ||||
16660 | if (!EltTy->isDependentType() && !EltTy->containsErrors()) { | ||||
16661 | if (RequireCompleteSizedType(Loc, EltTy, | ||||
16662 | diag::err_field_incomplete_or_sizeless)) { | ||||
16663 | // Fields of incomplete type force their record to be invalid. | ||||
16664 | Record->setInvalidDecl(); | ||||
16665 | InvalidDecl = true; | ||||
16666 | } else { | ||||
16667 | NamedDecl *Def; | ||||
16668 | EltTy->isIncompleteType(&Def); | ||||
16669 | if (Def && Def->isInvalidDecl()) { | ||||
16670 | Record->setInvalidDecl(); | ||||
16671 | InvalidDecl = true; | ||||
16672 | } | ||||
16673 | } | ||||
16674 | } | ||||
16675 | |||||
16676 | // TR 18037 does not allow fields to be declared with address space | ||||
16677 | if (T.hasAddressSpace() || T->isDependentAddressSpaceType() || | ||||
16678 | T->getBaseElementTypeUnsafe()->isDependentAddressSpaceType()) { | ||||
16679 | Diag(Loc, diag::err_field_with_address_space); | ||||
16680 | Record->setInvalidDecl(); | ||||
16681 | InvalidDecl = true; | ||||
16682 | } | ||||
16683 | |||||
16684 | if (LangOpts.OpenCL) { | ||||
16685 | // OpenCL v1.2 s6.9b,r & OpenCL v2.0 s6.12.5 - The following types cannot be | ||||
16686 | // used as structure or union field: image, sampler, event or block types. | ||||
16687 | if (T->isEventT() || T->isImageType() || T->isSamplerT() || | ||||
16688 | T->isBlockPointerType()) { | ||||
16689 | Diag(Loc, diag::err_opencl_type_struct_or_union_field) << T; | ||||
16690 | Record->setInvalidDecl(); | ||||
16691 | InvalidDecl = true; | ||||
16692 | } | ||||
16693 | // OpenCL v1.2 s6.9.c: bitfields are not supported. | ||||
16694 | if (BitWidth) { | ||||
16695 | Diag(Loc, diag::err_opencl_bitfields); | ||||
16696 | InvalidDecl = true; | ||||
16697 | } | ||||
16698 | } | ||||
16699 | |||||
16700 | // Anonymous bit-fields cannot be cv-qualified (CWG 2229). | ||||
16701 | if (!InvalidDecl && getLangOpts().CPlusPlus && !II && BitWidth && | ||||
16702 | T.hasQualifiers()) { | ||||
16703 | InvalidDecl = true; | ||||
16704 | Diag(Loc, diag::err_anon_bitfield_qualifiers); | ||||
16705 | } | ||||
16706 | |||||
16707 | // C99 6.7.2.1p8: A member of a structure or union may have any type other | ||||
16708 | // than a variably modified type. | ||||
16709 | if (!InvalidDecl && T->isVariablyModifiedType()) { | ||||
16710 | if (!tryToFixVariablyModifiedVarType( | ||||
16711 | *this, TInfo, T, Loc, diag::err_typecheck_field_variable_size)) | ||||
16712 | InvalidDecl = true; | ||||
16713 | } | ||||
16714 | |||||
16715 | // Fields can not have abstract class types | ||||
16716 | if (!InvalidDecl && RequireNonAbstractType(Loc, T, | ||||
16717 | diag::err_abstract_type_in_decl, | ||||
16718 | AbstractFieldType)) | ||||
16719 | InvalidDecl = true; | ||||
16720 | |||||
16721 | bool ZeroWidth = false; | ||||
16722 | if (InvalidDecl) | ||||
16723 | BitWidth = nullptr; | ||||
16724 | // If this is declared as a bit-field, check the bit-field. | ||||
16725 | if (BitWidth) { | ||||
16726 | BitWidth = VerifyBitField(Loc, II, T, Record->isMsStruct(Context), BitWidth, | ||||
16727 | &ZeroWidth).get(); | ||||
16728 | if (!BitWidth) { | ||||
16729 | InvalidDecl = true; | ||||
16730 | BitWidth = nullptr; | ||||
16731 | ZeroWidth = false; | ||||
16732 | } | ||||
16733 | } | ||||
16734 | |||||
16735 | // Check that 'mutable' is consistent with the type of the declaration. | ||||
16736 | if (!InvalidDecl && Mutable) { | ||||
16737 | unsigned DiagID = 0; | ||||
16738 | if (T->isReferenceType()) | ||||
16739 | DiagID = getLangOpts().MSVCCompat ? diag::ext_mutable_reference | ||||
16740 | : diag::err_mutable_reference; | ||||
16741 | else if (T.isConstQualified()) | ||||
16742 | DiagID = diag::err_mutable_const; | ||||
16743 | |||||
16744 | if (DiagID) { | ||||
16745 | SourceLocation ErrLoc = Loc; | ||||
16746 | if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) | ||||
16747 | ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); | ||||
16748 | Diag(ErrLoc, DiagID); | ||||
16749 | if (DiagID != diag::ext_mutable_reference) { | ||||
16750 | Mutable = false; | ||||
16751 | InvalidDecl = true; | ||||
16752 | } | ||||
16753 | } | ||||
16754 | } | ||||
16755 | |||||
16756 | // C++11 [class.union]p8 (DR1460): | ||||
16757 | // At most one variant member of a union may have a | ||||
16758 | // brace-or-equal-initializer. | ||||
16759 | if (InitStyle != ICIS_NoInit) | ||||
16760 | checkDuplicateDefaultInit(*this, cast<CXXRecordDecl>(Record), Loc); | ||||
16761 | |||||
16762 | FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, | ||||
16763 | BitWidth, Mutable, InitStyle); | ||||
16764 | if (InvalidDecl) | ||||
16765 | NewFD->setInvalidDecl(); | ||||
16766 | |||||
16767 | if (PrevDecl && !isa<TagDecl>(PrevDecl)) { | ||||
16768 | Diag(Loc, diag::err_duplicate_member) << II; | ||||
16769 | Diag(PrevDecl->getLocation(), diag::note_previous_declaration); | ||||
16770 | NewFD->setInvalidDecl(); | ||||
16771 | } | ||||
16772 | |||||
16773 | if (!InvalidDecl && getLangOpts().CPlusPlus) { | ||||
16774 | if (Record->isUnion()) { | ||||
16775 | if (const RecordType *RT = EltTy->getAs<RecordType>()) { | ||||
16776 | CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); | ||||
16777 | if (RDecl->getDefinition()) { | ||||
16778 | // C++ [class.union]p1: An object of a class with a non-trivial | ||||
16779 | // constructor, a non-trivial copy constructor, a non-trivial | ||||
16780 | // destructor, or a non-trivial copy assignment operator | ||||
16781 | // cannot be a member of a union, nor can an array of such | ||||
16782 | // objects. | ||||
16783 | if (CheckNontrivialField(NewFD)) | ||||
16784 | NewFD->setInvalidDecl(); | ||||
16785 | } | ||||
16786 | } | ||||
16787 | |||||
16788 | // C++ [class.union]p1: If a union contains a member of reference type, | ||||
16789 | // the program is ill-formed, except when compiling with MSVC extensions | ||||
16790 | // enabled. | ||||
16791 | if (EltTy->isReferenceType()) { | ||||
16792 | Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ? | ||||
16793 | diag::ext_union_member_of_reference_type : | ||||
16794 | diag::err_union_member_of_reference_type) | ||||
16795 | << NewFD->getDeclName() << EltTy; | ||||
16796 | if (!getLangOpts().MicrosoftExt) | ||||
16797 | NewFD->setInvalidDecl(); | ||||
16798 | } | ||||
16799 | } | ||||
16800 | } | ||||
16801 | |||||
16802 | // FIXME: We need to pass in the attributes given an AST | ||||
16803 | // representation, not a parser representation. | ||||
16804 | if (D) { | ||||
16805 | // FIXME: The current scope is almost... but not entirely... correct here. | ||||
16806 | ProcessDeclAttributes(getCurScope(), NewFD, *D); | ||||
16807 | |||||
16808 | if (NewFD->hasAttrs()) | ||||
16809 | CheckAlignasUnderalignment(NewFD); | ||||
16810 | } | ||||
16811 | |||||
16812 | // In auto-retain/release, infer strong retension for fields of | ||||
16813 | // retainable type. | ||||
16814 | if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) | ||||
16815 | NewFD->setInvalidDecl(); | ||||
16816 | |||||
16817 | if (T.isObjCGCWeak()) | ||||
16818 | Diag(Loc, diag::warn_attribute_weak_on_field); | ||||
16819 | |||||
16820 | // PPC MMA non-pointer types are not allowed as field types. | ||||
16821 | if (Context.getTargetInfo().getTriple().isPPC64() && | ||||
16822 | CheckPPCMMAType(T, NewFD->getLocation())) | ||||
16823 | NewFD->setInvalidDecl(); | ||||
16824 | |||||
16825 | NewFD->setAccess(AS); | ||||
16826 | return NewFD; | ||||
16827 | } | ||||
16828 | |||||
16829 | bool Sema::CheckNontrivialField(FieldDecl *FD) { | ||||
16830 | assert(FD)((FD) ? static_cast<void> (0) : __assert_fail ("FD", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16830, __PRETTY_FUNCTION__)); | ||||
16831 | assert(getLangOpts().CPlusPlus && "valid check only for C++")((getLangOpts().CPlusPlus && "valid check only for C++" ) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"valid check only for C++\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16831, __PRETTY_FUNCTION__)); | ||||
16832 | |||||
16833 | if (FD->isInvalidDecl() || FD->getType()->isDependentType()) | ||||
16834 | return false; | ||||
16835 | |||||
16836 | QualType EltTy = Context.getBaseElementType(FD->getType()); | ||||
16837 | if (const RecordType *RT = EltTy->getAs<RecordType>()) { | ||||
16838 | CXXRecordDecl *RDecl = cast<CXXRecordDecl>(RT->getDecl()); | ||||
16839 | if (RDecl->getDefinition()) { | ||||
16840 | // We check for copy constructors before constructors | ||||
16841 | // because otherwise we'll never get complaints about | ||||
16842 | // copy constructors. | ||||
16843 | |||||
16844 | CXXSpecialMember member = CXXInvalid; | ||||
16845 | // We're required to check for any non-trivial constructors. Since the | ||||
16846 | // implicit default constructor is suppressed if there are any | ||||
16847 | // user-declared constructors, we just need to check that there is a | ||||
16848 | // trivial default constructor and a trivial copy constructor. (We don't | ||||
16849 | // worry about move constructors here, since this is a C++98 check.) | ||||
16850 | if (RDecl->hasNonTrivialCopyConstructor()) | ||||
16851 | member = CXXCopyConstructor; | ||||
16852 | else if (!RDecl->hasTrivialDefaultConstructor()) | ||||
16853 | member = CXXDefaultConstructor; | ||||
16854 | else if (RDecl->hasNonTrivialCopyAssignment()) | ||||
16855 | member = CXXCopyAssignment; | ||||
16856 | else if (RDecl->hasNonTrivialDestructor()) | ||||
16857 | member = CXXDestructor; | ||||
16858 | |||||
16859 | if (member != CXXInvalid) { | ||||
16860 | if (!getLangOpts().CPlusPlus11 && | ||||
16861 | getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) { | ||||
16862 | // Objective-C++ ARC: it is an error to have a non-trivial field of | ||||
16863 | // a union. However, system headers in Objective-C programs | ||||
16864 | // occasionally have Objective-C lifetime objects within unions, | ||||
16865 | // and rather than cause the program to fail, we make those | ||||
16866 | // members unavailable. | ||||
16867 | SourceLocation Loc = FD->getLocation(); | ||||
16868 | if (getSourceManager().isInSystemHeader(Loc)) { | ||||
16869 | if (!FD->hasAttr<UnavailableAttr>()) | ||||
16870 | FD->addAttr(UnavailableAttr::CreateImplicit(Context, "", | ||||
16871 | UnavailableAttr::IR_ARCFieldWithOwnership, Loc)); | ||||
16872 | return false; | ||||
16873 | } | ||||
16874 | } | ||||
16875 | |||||
16876 | Diag(FD->getLocation(), getLangOpts().CPlusPlus11 ? | ||||
16877 | diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : | ||||
16878 | diag::err_illegal_union_or_anon_struct_member) | ||||
16879 | << FD->getParent()->isUnion() << FD->getDeclName() << member; | ||||
16880 | DiagnoseNontrivial(RDecl, member); | ||||
16881 | return !getLangOpts().CPlusPlus11; | ||||
16882 | } | ||||
16883 | } | ||||
16884 | } | ||||
16885 | |||||
16886 | return false; | ||||
16887 | } | ||||
16888 | |||||
16889 | /// TranslateIvarVisibility - Translate visibility from a token ID to an | ||||
16890 | /// AST enum value. | ||||
16891 | static ObjCIvarDecl::AccessControl | ||||
16892 | TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { | ||||
16893 | switch (ivarVisibility) { | ||||
16894 | default: llvm_unreachable("Unknown visitibility kind")::llvm::llvm_unreachable_internal("Unknown visitibility kind" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16894); | ||||
16895 | case tok::objc_private: return ObjCIvarDecl::Private; | ||||
16896 | case tok::objc_public: return ObjCIvarDecl::Public; | ||||
16897 | case tok::objc_protected: return ObjCIvarDecl::Protected; | ||||
16898 | case tok::objc_package: return ObjCIvarDecl::Package; | ||||
16899 | } | ||||
16900 | } | ||||
16901 | |||||
16902 | /// ActOnIvar - Each ivar field of an objective-c class is passed into this | ||||
16903 | /// in order to create an IvarDecl object for it. | ||||
16904 | Decl *Sema::ActOnIvar(Scope *S, | ||||
16905 | SourceLocation DeclStart, | ||||
16906 | Declarator &D, Expr *BitfieldWidth, | ||||
16907 | tok::ObjCKeywordKind Visibility) { | ||||
16908 | |||||
16909 | IdentifierInfo *II = D.getIdentifier(); | ||||
16910 | Expr *BitWidth = (Expr*)BitfieldWidth; | ||||
16911 | SourceLocation Loc = DeclStart; | ||||
16912 | if (II) Loc = D.getIdentifierLoc(); | ||||
16913 | |||||
16914 | // FIXME: Unnamed fields can be handled in various different ways, for | ||||
16915 | // example, unnamed unions inject all members into the struct namespace! | ||||
16916 | |||||
16917 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); | ||||
16918 | QualType T = TInfo->getType(); | ||||
16919 | |||||
16920 | if (BitWidth) { | ||||
16921 | // 6.7.2.1p3, 6.7.2.1p4 | ||||
16922 | BitWidth = VerifyBitField(Loc, II, T, /*IsMsStruct*/false, BitWidth).get(); | ||||
16923 | if (!BitWidth) | ||||
16924 | D.setInvalidType(); | ||||
16925 | } else { | ||||
16926 | // Not a bitfield. | ||||
16927 | |||||
16928 | // validate II. | ||||
16929 | |||||
16930 | } | ||||
16931 | if (T->isReferenceType()) { | ||||
16932 | Diag(Loc, diag::err_ivar_reference_type); | ||||
16933 | D.setInvalidType(); | ||||
16934 | } | ||||
16935 | // C99 6.7.2.1p8: A member of a structure or union may have any type other | ||||
16936 | // than a variably modified type. | ||||
16937 | else if (T->isVariablyModifiedType()) { | ||||
16938 | if (!tryToFixVariablyModifiedVarType( | ||||
16939 | *this, TInfo, T, Loc, diag::err_typecheck_ivar_variable_size)) | ||||
16940 | D.setInvalidType(); | ||||
16941 | } | ||||
16942 | |||||
16943 | // Get the visibility (access control) for this ivar. | ||||
16944 | ObjCIvarDecl::AccessControl ac = | ||||
16945 | Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) | ||||
16946 | : ObjCIvarDecl::None; | ||||
16947 | // Must set ivar's DeclContext to its enclosing interface. | ||||
16948 | ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); | ||||
16949 | if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) | ||||
16950 | return nullptr; | ||||
16951 | ObjCContainerDecl *EnclosingContext; | ||||
16952 | if (ObjCImplementationDecl *IMPDecl = | ||||
16953 | dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { | ||||
16954 | if (LangOpts.ObjCRuntime.isFragile()) { | ||||
16955 | // Case of ivar declared in an implementation. Context is that of its class. | ||||
16956 | EnclosingContext = IMPDecl->getClassInterface(); | ||||
16957 | assert(EnclosingContext && "Implementation has no class interface!")((EnclosingContext && "Implementation has no class interface!" ) ? static_cast<void> (0) : __assert_fail ("EnclosingContext && \"Implementation has no class interface!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 16957, __PRETTY_FUNCTION__)); | ||||
16958 | } | ||||
16959 | else | ||||
16960 | EnclosingContext = EnclosingDecl; | ||||
16961 | } else { | ||||
16962 | if (ObjCCategoryDecl *CDecl = | ||||
16963 | dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { | ||||
16964 | if (LangOpts.ObjCRuntime.isFragile() || !CDecl->IsClassExtension()) { | ||||
16965 | Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); | ||||
16966 | return nullptr; | ||||
16967 | } | ||||
16968 | } | ||||
16969 | EnclosingContext = EnclosingDecl; | ||||
16970 | } | ||||
16971 | |||||
16972 | // Construct the decl. | ||||
16973 | ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, | ||||
16974 | DeclStart, Loc, II, T, | ||||
16975 | TInfo, ac, (Expr *)BitfieldWidth); | ||||
16976 | |||||
16977 | if (II) { | ||||
16978 | NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, | ||||
16979 | ForVisibleRedeclaration); | ||||
16980 | if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) | ||||
16981 | && !isa<TagDecl>(PrevDecl)) { | ||||
16982 | Diag(Loc, diag::err_duplicate_member) << II; | ||||
16983 | Diag(PrevDecl->getLocation(), diag::note_previous_declaration); | ||||
16984 | NewID->setInvalidDecl(); | ||||
16985 | } | ||||
16986 | } | ||||
16987 | |||||
16988 | // Process attributes attached to the ivar. | ||||
16989 | ProcessDeclAttributes(S, NewID, D); | ||||
16990 | |||||
16991 | if (D.isInvalidType()) | ||||
16992 | NewID->setInvalidDecl(); | ||||
16993 | |||||
16994 | // In ARC, infer 'retaining' for ivars of retainable type. | ||||
16995 | if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) | ||||
16996 | NewID->setInvalidDecl(); | ||||
16997 | |||||
16998 | if (D.getDeclSpec().isModulePrivateSpecified()) | ||||
16999 | NewID->setModulePrivate(); | ||||
17000 | |||||
17001 | if (II) { | ||||
17002 | // FIXME: When interfaces are DeclContexts, we'll need to add | ||||
17003 | // these to the interface. | ||||
17004 | S->AddDecl(NewID); | ||||
17005 | IdResolver.AddDecl(NewID); | ||||
17006 | } | ||||
17007 | |||||
17008 | if (LangOpts.ObjCRuntime.isNonFragile() && | ||||
17009 | !NewID->isInvalidDecl() && isa<ObjCInterfaceDecl>(EnclosingDecl)) | ||||
17010 | Diag(Loc, diag::warn_ivars_in_interface); | ||||
17011 | |||||
17012 | return NewID; | ||||
17013 | } | ||||
17014 | |||||
17015 | /// ActOnLastBitfield - This routine handles synthesized bitfields rules for | ||||
17016 | /// class and class extensions. For every class \@interface and class | ||||
17017 | /// extension \@interface, if the last ivar is a bitfield of any type, | ||||
17018 | /// then add an implicit `char :0` ivar to the end of that interface. | ||||
17019 | void Sema::ActOnLastBitfield(SourceLocation DeclLoc, | ||||
17020 | SmallVectorImpl<Decl *> &AllIvarDecls) { | ||||
17021 | if (LangOpts.ObjCRuntime.isFragile() || AllIvarDecls.empty()) | ||||
17022 | return; | ||||
17023 | |||||
17024 | Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; | ||||
17025 | ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); | ||||
17026 | |||||
17027 | if (!Ivar->isBitField() || Ivar->isZeroLengthBitField(Context)) | ||||
17028 | return; | ||||
17029 | ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); | ||||
17030 | if (!ID) { | ||||
17031 | if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { | ||||
17032 | if (!CD->IsClassExtension()) | ||||
17033 | return; | ||||
17034 | } | ||||
17035 | // No need to add this to end of @implementation. | ||||
17036 | else | ||||
17037 | return; | ||||
17038 | } | ||||
17039 | // All conditions are met. Add a new bitfield to the tail end of ivars. | ||||
17040 | llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); | ||||
17041 | Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); | ||||
17042 | |||||
17043 | Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), | ||||
17044 | DeclLoc, DeclLoc, nullptr, | ||||
17045 | Context.CharTy, | ||||
17046 | Context.getTrivialTypeSourceInfo(Context.CharTy, | ||||
17047 | DeclLoc), | ||||
17048 | ObjCIvarDecl::Private, BW, | ||||
17049 | true); | ||||
17050 | AllIvarDecls.push_back(Ivar); | ||||
17051 | } | ||||
17052 | |||||
17053 | void Sema::ActOnFields(Scope *S, SourceLocation RecLoc, Decl *EnclosingDecl, | ||||
17054 | ArrayRef<Decl *> Fields, SourceLocation LBrac, | ||||
17055 | SourceLocation RBrac, | ||||
17056 | const ParsedAttributesView &Attrs) { | ||||
17057 | assert(EnclosingDecl && "missing record or interface decl")((EnclosingDecl && "missing record or interface decl" ) ? static_cast<void> (0) : __assert_fail ("EnclosingDecl && \"missing record or interface decl\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 17057, __PRETTY_FUNCTION__)); | ||||
17058 | |||||
17059 | // If this is an Objective-C @implementation or category and we have | ||||
17060 | // new fields here we should reset the layout of the interface since | ||||
17061 | // it will now change. | ||||
17062 | if (!Fields.empty() && isa<ObjCContainerDecl>(EnclosingDecl)) { | ||||
17063 | ObjCContainerDecl *DC = cast<ObjCContainerDecl>(EnclosingDecl); | ||||
17064 | switch (DC->getKind()) { | ||||
17065 | default: break; | ||||
17066 | case Decl::ObjCCategory: | ||||
17067 | Context.ResetObjCLayout(cast<ObjCCategoryDecl>(DC)->getClassInterface()); | ||||
17068 | break; | ||||
17069 | case Decl::ObjCImplementation: | ||||
17070 | Context. | ||||
17071 | ResetObjCLayout(cast<ObjCImplementationDecl>(DC)->getClassInterface()); | ||||
17072 | break; | ||||
17073 | } | ||||
17074 | } | ||||
17075 | |||||
17076 | RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); | ||||
17077 | CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(EnclosingDecl); | ||||
17078 | |||||
17079 | // Start counting up the number of named members; make sure to include | ||||
17080 | // members of anonymous structs and unions in the total. | ||||
17081 | unsigned NumNamedMembers = 0; | ||||
17082 | if (Record) { | ||||
17083 | for (const auto *I : Record->decls()) { | ||||
17084 | if (const auto *IFD = dyn_cast<IndirectFieldDecl>(I)) | ||||
17085 | if (IFD->getDeclName()) | ||||
17086 | ++NumNamedMembers; | ||||
17087 | } | ||||
17088 | } | ||||
17089 | |||||
17090 | // Verify that all the fields are okay. | ||||
17091 | SmallVector<FieldDecl*, 32> RecFields; | ||||
17092 | |||||
17093 | for (ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); | ||||
17094 | i != end; ++i) { | ||||
17095 | FieldDecl *FD = cast<FieldDecl>(*i); | ||||
17096 | |||||
17097 | // Get the type for the field. | ||||
17098 | const Type *FDTy = FD->getType().getTypePtr(); | ||||
17099 | |||||
17100 | if (!FD->isAnonymousStructOrUnion()) { | ||||
17101 | // Remember all fields written by the user. | ||||
17102 | RecFields.push_back(FD); | ||||
17103 | } | ||||
17104 | |||||
17105 | // If the field is already invalid for some reason, don't emit more | ||||
17106 | // diagnostics about it. | ||||
17107 | if (FD->isInvalidDecl()) { | ||||
17108 | EnclosingDecl->setInvalidDecl(); | ||||
17109 | continue; | ||||
17110 | } | ||||
17111 | |||||
17112 | // C99 6.7.2.1p2: | ||||
17113 | // A structure or union shall not contain a member with | ||||
17114 | // incomplete or function type (hence, a structure shall not | ||||
17115 | // contain an instance of itself, but may contain a pointer to | ||||
17116 | // an instance of itself), except that the last member of a | ||||
17117 | // structure with more than one named member may have incomplete | ||||
17118 | // array type; such a structure (and any union containing, | ||||
17119 | // possibly recursively, a member that is such a structure) | ||||
17120 | // shall not be a member of a structure or an element of an | ||||
17121 | // array. | ||||
17122 | bool IsLastField = (i + 1 == Fields.end()); | ||||
17123 | if (FDTy->isFunctionType()) { | ||||
17124 | // Field declared as a function. | ||||
17125 | Diag(FD->getLocation(), diag::err_field_declared_as_function) | ||||
17126 | << FD->getDeclName(); | ||||
17127 | FD->setInvalidDecl(); | ||||
17128 | EnclosingDecl->setInvalidDecl(); | ||||
17129 | continue; | ||||
17130 | } else if (FDTy->isIncompleteArrayType() && | ||||
17131 | (Record || isa<ObjCContainerDecl>(EnclosingDecl))) { | ||||
17132 | if (Record) { | ||||
17133 | // Flexible array member. | ||||
17134 | // Microsoft and g++ is more permissive regarding flexible array. | ||||
17135 | // It will accept flexible array in union and also | ||||
17136 | // as the sole element of a struct/class. | ||||
17137 | unsigned DiagID = 0; | ||||
17138 | if (!Record->isUnion() && !IsLastField) { | ||||
17139 | Diag(FD->getLocation(), diag::err_flexible_array_not_at_end) | ||||
17140 | << FD->getDeclName() << FD->getType() << Record->getTagKind(); | ||||
17141 | Diag((*(i + 1))->getLocation(), diag::note_next_field_declaration); | ||||
17142 | FD->setInvalidDecl(); | ||||
17143 | EnclosingDecl->setInvalidDecl(); | ||||
17144 | continue; | ||||
17145 | } else if (Record->isUnion()) | ||||
17146 | DiagID = getLangOpts().MicrosoftExt | ||||
17147 | ? diag::ext_flexible_array_union_ms | ||||
17148 | : getLangOpts().CPlusPlus | ||||
17149 | ? diag::ext_flexible_array_union_gnu | ||||
17150 | : diag::err_flexible_array_union; | ||||
17151 | else if (NumNamedMembers < 1) | ||||
17152 | DiagID = getLangOpts().MicrosoftExt | ||||
17153 | ? diag::ext_flexible_array_empty_aggregate_ms | ||||
17154 | : getLangOpts().CPlusPlus | ||||
17155 | ? diag::ext_flexible_array_empty_aggregate_gnu | ||||
17156 | : diag::err_flexible_array_empty_aggregate; | ||||
17157 | |||||
17158 | if (DiagID) | ||||
17159 | Diag(FD->getLocation(), DiagID) << FD->getDeclName() | ||||
17160 | << Record->getTagKind(); | ||||
17161 | // While the layout of types that contain virtual bases is not specified | ||||
17162 | // by the C++ standard, both the Itanium and Microsoft C++ ABIs place | ||||
17163 | // virtual bases after the derived members. This would make a flexible | ||||
17164 | // array member declared at the end of an object not adjacent to the end | ||||
17165 | // of the type. | ||||
17166 | if (CXXRecord && CXXRecord->getNumVBases() != 0) | ||||
17167 | Diag(FD->getLocation(), diag::err_flexible_array_virtual_base) | ||||
17168 | << FD->getDeclName() << Record->getTagKind(); | ||||
17169 | if (!getLangOpts().C99) | ||||
17170 | Diag(FD->getLocation(), diag::ext_c99_flexible_array_member) | ||||
17171 | << FD->getDeclName() << Record->getTagKind(); | ||||
17172 | |||||
17173 | // If the element type has a non-trivial destructor, we would not | ||||
17174 | // implicitly destroy the elements, so disallow it for now. | ||||
17175 | // | ||||
17176 | // FIXME: GCC allows this. We should probably either implicitly delete | ||||
17177 | // the destructor of the containing class, or just allow this. | ||||
17178 | QualType BaseElem = Context.getBaseElementType(FD->getType()); | ||||
17179 | if (!BaseElem->isDependentType() && BaseElem.isDestructedType()) { | ||||
17180 | Diag(FD->getLocation(), diag::err_flexible_array_has_nontrivial_dtor) | ||||
17181 | << FD->getDeclName() << FD->getType(); | ||||
17182 | FD->setInvalidDecl(); | ||||
17183 | EnclosingDecl->setInvalidDecl(); | ||||
17184 | continue; | ||||
17185 | } | ||||
17186 | // Okay, we have a legal flexible array member at the end of the struct. | ||||
17187 | Record->setHasFlexibleArrayMember(true); | ||||
17188 | } else { | ||||
17189 | // In ObjCContainerDecl ivars with incomplete array type are accepted, | ||||
17190 | // unless they are followed by another ivar. That check is done | ||||
17191 | // elsewhere, after synthesized ivars are known. | ||||
17192 | } | ||||
17193 | } else if (!FDTy->isDependentType() && | ||||
17194 | RequireCompleteSizedType( | ||||
17195 | FD->getLocation(), FD->getType(), | ||||
17196 | diag::err_field_incomplete_or_sizeless)) { | ||||
17197 | // Incomplete type | ||||
17198 | FD->setInvalidDecl(); | ||||
17199 | EnclosingDecl->setInvalidDecl(); | ||||
17200 | continue; | ||||
17201 | } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { | ||||
17202 | if (Record && FDTTy->getDecl()->hasFlexibleArrayMember()) { | ||||
17203 | // A type which contains a flexible array member is considered to be a | ||||
17204 | // flexible array member. | ||||
17205 | Record->setHasFlexibleArrayMember(true); | ||||
17206 | if (!Record->isUnion()) { | ||||
17207 | // If this is a struct/class and this is not the last element, reject | ||||
17208 | // it. Note that GCC supports variable sized arrays in the middle of | ||||
17209 | // structures. | ||||
17210 | if (!IsLastField) | ||||
17211 | Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) | ||||
17212 | << FD->getDeclName() << FD->getType(); | ||||
17213 | else { | ||||
17214 | // We support flexible arrays at the end of structs in | ||||
17215 | // other structs as an extension. | ||||
17216 | Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) | ||||
17217 | << FD->getDeclName(); | ||||
17218 | } | ||||
17219 | } | ||||
17220 | } | ||||
17221 | if (isa<ObjCContainerDecl>(EnclosingDecl) && | ||||
17222 | RequireNonAbstractType(FD->getLocation(), FD->getType(), | ||||
17223 | diag::err_abstract_type_in_decl, | ||||
17224 | AbstractIvarType)) { | ||||
17225 | // Ivars can not have abstract class types | ||||
17226 | FD->setInvalidDecl(); | ||||
17227 | } | ||||
17228 | if (Record && FDTTy->getDecl()->hasObjectMember()) | ||||
17229 | Record->setHasObjectMember(true); | ||||
17230 | if (Record && FDTTy->getDecl()->hasVolatileMember()) | ||||
17231 | Record->setHasVolatileMember(true); | ||||
17232 | } else if (FDTy->isObjCObjectType()) { | ||||
17233 | /// A field cannot be an Objective-c object | ||||
17234 | Diag(FD->getLocation(), diag::err_statically_allocated_object) | ||||
17235 | << FixItHint::CreateInsertion(FD->getLocation(), "*"); | ||||
17236 | QualType T = Context.getObjCObjectPointerType(FD->getType()); | ||||
17237 | FD->setType(T); | ||||
17238 | } else if (Record && Record->isUnion() && | ||||
17239 | FD->getType().hasNonTrivialObjCLifetime() && | ||||
17240 | getSourceManager().isInSystemHeader(FD->getLocation()) && | ||||
17241 | !getLangOpts().CPlusPlus && !FD->hasAttr<UnavailableAttr>() && | ||||
17242 | (FD->getType().getObjCLifetime() != Qualifiers::OCL_Strong || | ||||
17243 | !Context.hasDirectOwnershipQualifier(FD->getType()))) { | ||||
17244 | // For backward compatibility, fields of C unions declared in system | ||||
17245 | // headers that have non-trivial ObjC ownership qualifications are marked | ||||
17246 | // as unavailable unless the qualifier is explicit and __strong. This can | ||||
17247 | // break ABI compatibility between programs compiled with ARC and MRR, but | ||||
17248 | // is a better option than rejecting programs using those unions under | ||||
17249 | // ARC. | ||||
17250 | FD->addAttr(UnavailableAttr::CreateImplicit( | ||||
17251 | Context, "", UnavailableAttr::IR_ARCFieldWithOwnership, | ||||
17252 | FD->getLocation())); | ||||
17253 | } else if (getLangOpts().ObjC && | ||||
17254 | getLangOpts().getGC() != LangOptions::NonGC && Record && | ||||
17255 | !Record->hasObjectMember()) { | ||||
17256 | if (FD->getType()->isObjCObjectPointerType() || | ||||
17257 | FD->getType().isObjCGCStrong()) | ||||
17258 | Record->setHasObjectMember(true); | ||||
17259 | else if (Context.getAsArrayType(FD->getType())) { | ||||
17260 | QualType BaseType = Context.getBaseElementType(FD->getType()); | ||||
17261 | if (BaseType->isRecordType() && | ||||
17262 | BaseType->castAs<RecordType>()->getDecl()->hasObjectMember()) | ||||
17263 | Record->setHasObjectMember(true); | ||||
17264 | else if (BaseType->isObjCObjectPointerType() || | ||||
17265 | BaseType.isObjCGCStrong()) | ||||
17266 | Record->setHasObjectMember(true); | ||||
17267 | } | ||||
17268 | } | ||||
17269 | |||||
17270 | if (Record && !getLangOpts().CPlusPlus && | ||||
17271 | !shouldIgnoreForRecordTriviality(FD)) { | ||||
17272 | QualType FT = FD->getType(); | ||||
17273 | if (FT.isNonTrivialToPrimitiveDefaultInitialize()) { | ||||
17274 | Record->setNonTrivialToPrimitiveDefaultInitialize(true); | ||||
17275 | if (FT.hasNonTrivialToPrimitiveDefaultInitializeCUnion() || | ||||
17276 | Record->isUnion()) | ||||
17277 | Record->setHasNonTrivialToPrimitiveDefaultInitializeCUnion(true); | ||||
17278 | } | ||||
17279 | QualType::PrimitiveCopyKind PCK = FT.isNonTrivialToPrimitiveCopy(); | ||||
17280 | if (PCK != QualType::PCK_Trivial && PCK != QualType::PCK_VolatileTrivial) { | ||||
17281 | Record->setNonTrivialToPrimitiveCopy(true); | ||||
17282 | if (FT.hasNonTrivialToPrimitiveCopyCUnion() || Record->isUnion()) | ||||
17283 | Record->setHasNonTrivialToPrimitiveCopyCUnion(true); | ||||
17284 | } | ||||
17285 | if (FT.isDestructedType()) { | ||||
17286 | Record->setNonTrivialToPrimitiveDestroy(true); | ||||
17287 | Record->setParamDestroyedInCallee(true); | ||||
17288 | if (FT.hasNonTrivialToPrimitiveDestructCUnion() || Record->isUnion()) | ||||
17289 | Record->setHasNonTrivialToPrimitiveDestructCUnion(true); | ||||
17290 | } | ||||
17291 | |||||
17292 | if (const auto *RT = FT->getAs<RecordType>()) { | ||||
17293 | if (RT->getDecl()->getArgPassingRestrictions() == | ||||
17294 | RecordDecl::APK_CanNeverPassInRegs) | ||||
17295 | Record->setArgPassingRestrictions(RecordDecl::APK_CanNeverPassInRegs); | ||||
17296 | } else if (FT.getQualifiers().getObjCLifetime() == Qualifiers::OCL_Weak) | ||||
17297 | Record->setArgPassingRestrictions(RecordDecl::APK_CanNeverPassInRegs); | ||||
17298 | } | ||||
17299 | |||||
17300 | if (Record && FD->getType().isVolatileQualified()) | ||||
17301 | Record->setHasVolatileMember(true); | ||||
17302 | // Keep track of the number of named members. | ||||
17303 | if (FD->getIdentifier()) | ||||
17304 | ++NumNamedMembers; | ||||
17305 | } | ||||
17306 | |||||
17307 | // Okay, we successfully defined 'Record'. | ||||
17308 | if (Record) { | ||||
17309 | bool Completed = false; | ||||
17310 | if (CXXRecord) { | ||||
17311 | if (!CXXRecord->isInvalidDecl()) { | ||||
17312 | // Set access bits correctly on the directly-declared conversions. | ||||
17313 | for (CXXRecordDecl::conversion_iterator | ||||
17314 | I = CXXRecord->conversion_begin(), | ||||
17315 | E = CXXRecord->conversion_end(); I != E; ++I) | ||||
17316 | I.setAccess((*I)->getAccess()); | ||||
17317 | } | ||||
17318 | |||||
17319 | // Add any implicitly-declared members to this class. | ||||
17320 | AddImplicitlyDeclaredMembersToClass(CXXRecord); | ||||
17321 | |||||
17322 | if (!CXXRecord->isDependentType()) { | ||||
17323 | if (!CXXRecord->isInvalidDecl()) { | ||||
17324 | // If we have virtual base classes, we may end up finding multiple | ||||
17325 | // final overriders for a given virtual function. Check for this | ||||
17326 | // problem now. | ||||
17327 | if (CXXRecord->getNumVBases()) { | ||||
17328 | CXXFinalOverriderMap FinalOverriders; | ||||
17329 | CXXRecord->getFinalOverriders(FinalOverriders); | ||||
17330 | |||||
17331 | for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), | ||||
17332 | MEnd = FinalOverriders.end(); | ||||
17333 | M != MEnd; ++M) { | ||||
17334 | for (OverridingMethods::iterator SO = M->second.begin(), | ||||
17335 | SOEnd = M->second.end(); | ||||
17336 | SO != SOEnd; ++SO) { | ||||
17337 | assert(SO->second.size() > 0 &&((SO->second.size() > 0 && "Virtual function without overriding functions?" ) ? static_cast<void> (0) : __assert_fail ("SO->second.size() > 0 && \"Virtual function without overriding functions?\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 17338, __PRETTY_FUNCTION__)) | ||||
17338 | "Virtual function without overriding functions?")((SO->second.size() > 0 && "Virtual function without overriding functions?" ) ? static_cast<void> (0) : __assert_fail ("SO->second.size() > 0 && \"Virtual function without overriding functions?\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 17338, __PRETTY_FUNCTION__)); | ||||
17339 | if (SO->second.size() == 1) | ||||
17340 | continue; | ||||
17341 | |||||
17342 | // C++ [class.virtual]p2: | ||||
17343 | // In a derived class, if a virtual member function of a base | ||||
17344 | // class subobject has more than one final overrider the | ||||
17345 | // program is ill-formed. | ||||
17346 | Diag(Record->getLocation(), diag::err_multiple_final_overriders) | ||||
17347 | << (const NamedDecl *)M->first << Record; | ||||
17348 | Diag(M->first->getLocation(), | ||||
17349 | diag::note_overridden_virtual_function); | ||||
17350 | for (OverridingMethods::overriding_iterator | ||||
17351 | OM = SO->second.begin(), | ||||
17352 | OMEnd = SO->second.end(); | ||||
17353 | OM != OMEnd; ++OM) | ||||
17354 | Diag(OM->Method->getLocation(), diag::note_final_overrider) | ||||
17355 | << (const NamedDecl *)M->first << OM->Method->getParent(); | ||||
17356 | |||||
17357 | Record->setInvalidDecl(); | ||||
17358 | } | ||||
17359 | } | ||||
17360 | CXXRecord->completeDefinition(&FinalOverriders); | ||||
17361 | Completed = true; | ||||
17362 | } | ||||
17363 | } | ||||
17364 | } | ||||
17365 | } | ||||
17366 | |||||
17367 | if (!Completed) | ||||
17368 | Record->completeDefinition(); | ||||
17369 | |||||
17370 | // Handle attributes before checking the layout. | ||||
17371 | ProcessDeclAttributeList(S, Record, Attrs); | ||||
17372 | |||||
17373 | // We may have deferred checking for a deleted destructor. Check now. | ||||
17374 | if (CXXRecord) { | ||||
17375 | auto *Dtor = CXXRecord->getDestructor(); | ||||
17376 | if (Dtor && Dtor->isImplicit() && | ||||
17377 | ShouldDeleteSpecialMember(Dtor, CXXDestructor)) { | ||||
17378 | CXXRecord->setImplicitDestructorIsDeleted(); | ||||
17379 | SetDeclDeleted(Dtor, CXXRecord->getLocation()); | ||||
17380 | } | ||||
17381 | } | ||||
17382 | |||||
17383 | if (Record->hasAttrs()) { | ||||
17384 | CheckAlignasUnderalignment(Record); | ||||
17385 | |||||
17386 | if (const MSInheritanceAttr *IA = Record->getAttr<MSInheritanceAttr>()) | ||||
17387 | checkMSInheritanceAttrOnDefinition(cast<CXXRecordDecl>(Record), | ||||
17388 | IA->getRange(), IA->getBestCase(), | ||||
17389 | IA->getInheritanceModel()); | ||||
17390 | } | ||||
17391 | |||||
17392 | // Check if the structure/union declaration is a type that can have zero | ||||
17393 | // size in C. For C this is a language extension, for C++ it may cause | ||||
17394 | // compatibility problems. | ||||
17395 | bool CheckForZeroSize; | ||||
17396 | if (!getLangOpts().CPlusPlus) { | ||||
17397 | CheckForZeroSize = true; | ||||
17398 | } else { | ||||
17399 | // For C++ filter out types that cannot be referenced in C code. | ||||
17400 | CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); | ||||
17401 | CheckForZeroSize = | ||||
17402 | CXXRecord->getLexicalDeclContext()->isExternCContext() && | ||||
17403 | !CXXRecord->isDependentType() && !inTemplateInstantiation() && | ||||
17404 | CXXRecord->isCLike(); | ||||
17405 | } | ||||
17406 | if (CheckForZeroSize) { | ||||
17407 | bool ZeroSize = true; | ||||
17408 | bool IsEmpty = true; | ||||
17409 | unsigned NonBitFields = 0; | ||||
17410 | for (RecordDecl::field_iterator I = Record->field_begin(), | ||||
17411 | E = Record->field_end(); | ||||
17412 | (NonBitFields == 0 || ZeroSize) && I != E; ++I) { | ||||
17413 | IsEmpty = false; | ||||
17414 | if (I->isUnnamedBitfield()) { | ||||
17415 | if (!I->isZeroLengthBitField(Context)) | ||||
17416 | ZeroSize = false; | ||||
17417 | } else { | ||||
17418 | ++NonBitFields; | ||||
17419 | QualType FieldType = I->getType(); | ||||
17420 | if (FieldType->isIncompleteType() || | ||||
17421 | !Context.getTypeSizeInChars(FieldType).isZero()) | ||||
17422 | ZeroSize = false; | ||||
17423 | } | ||||
17424 | } | ||||
17425 | |||||
17426 | // Empty structs are an extension in C (C99 6.7.2.1p7). They are | ||||
17427 | // allowed in C++, but warn if its declaration is inside | ||||
17428 | // extern "C" block. | ||||
17429 | if (ZeroSize) { | ||||
17430 | Diag(RecLoc, getLangOpts().CPlusPlus ? | ||||
17431 | diag::warn_zero_size_struct_union_in_extern_c : | ||||
17432 | diag::warn_zero_size_struct_union_compat) | ||||
17433 | << IsEmpty << Record->isUnion() << (NonBitFields > 1); | ||||
17434 | } | ||||
17435 | |||||
17436 | // Structs without named members are extension in C (C99 6.7.2.1p7), | ||||
17437 | // but are accepted by GCC. | ||||
17438 | if (NonBitFields == 0 && !getLangOpts().CPlusPlus) { | ||||
17439 | Diag(RecLoc, IsEmpty ? diag::ext_empty_struct_union : | ||||
17440 | diag::ext_no_named_members_in_struct_union) | ||||
17441 | << Record->isUnion(); | ||||
17442 | } | ||||
17443 | } | ||||
17444 | } else { | ||||
17445 | ObjCIvarDecl **ClsFields = | ||||
17446 | reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); | ||||
17447 | if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { | ||||
17448 | ID->setEndOfDefinitionLoc(RBrac); | ||||
17449 | // Add ivar's to class's DeclContext. | ||||
17450 | for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { | ||||
17451 | ClsFields[i]->setLexicalDeclContext(ID); | ||||
17452 | ID->addDecl(ClsFields[i]); | ||||
17453 | } | ||||
17454 | // Must enforce the rule that ivars in the base classes may not be | ||||
17455 | // duplicates. | ||||
17456 | if (ID->getSuperClass()) | ||||
17457 | DiagnoseDuplicateIvars(ID, ID->getSuperClass()); | ||||
17458 | } else if (ObjCImplementationDecl *IMPDecl = | ||||
17459 | dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { | ||||
17460 | assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl")((IMPDecl && "ActOnFields - missing ObjCImplementationDecl" ) ? static_cast<void> (0) : __assert_fail ("IMPDecl && \"ActOnFields - missing ObjCImplementationDecl\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 17460, __PRETTY_FUNCTION__)); | ||||
17461 | for (unsigned I = 0, N = RecFields.size(); I != N; ++I) | ||||
17462 | // Ivar declared in @implementation never belongs to the implementation. | ||||
17463 | // Only it is in implementation's lexical context. | ||||
17464 | ClsFields[I]->setLexicalDeclContext(IMPDecl); | ||||
17465 | CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); | ||||
17466 | IMPDecl->setIvarLBraceLoc(LBrac); | ||||
17467 | IMPDecl->setIvarRBraceLoc(RBrac); | ||||
17468 | } else if (ObjCCategoryDecl *CDecl = | ||||
17469 | dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { | ||||
17470 | // case of ivars in class extension; all other cases have been | ||||
17471 | // reported as errors elsewhere. | ||||
17472 | // FIXME. Class extension does not have a LocEnd field. | ||||
17473 | // CDecl->setLocEnd(RBrac); | ||||
17474 | // Add ivar's to class extension's DeclContext. | ||||
17475 | // Diagnose redeclaration of private ivars. | ||||
17476 | ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); | ||||
17477 | for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { | ||||
17478 | if (IDecl) { | ||||
17479 | if (const ObjCIvarDecl *ClsIvar = | ||||
17480 | IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { | ||||
17481 | Diag(ClsFields[i]->getLocation(), | ||||
17482 | diag::err_duplicate_ivar_declaration); | ||||
17483 | Diag(ClsIvar->getLocation(), diag::note_previous_definition); | ||||
17484 | continue; | ||||
17485 | } | ||||
17486 | for (const auto *Ext : IDecl->known_extensions()) { | ||||
17487 | if (const ObjCIvarDecl *ClsExtIvar | ||||
17488 | = Ext->getIvarDecl(ClsFields[i]->getIdentifier())) { | ||||
17489 | Diag(ClsFields[i]->getLocation(), | ||||
17490 | diag::err_duplicate_ivar_declaration); | ||||
17491 | Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); | ||||
17492 | continue; | ||||
17493 | } | ||||
17494 | } | ||||
17495 | } | ||||
17496 | ClsFields[i]->setLexicalDeclContext(CDecl); | ||||
17497 | CDecl->addDecl(ClsFields[i]); | ||||
17498 | } | ||||
17499 | CDecl->setIvarLBraceLoc(LBrac); | ||||
17500 | CDecl->setIvarRBraceLoc(RBrac); | ||||
17501 | } | ||||
17502 | } | ||||
17503 | } | ||||
17504 | |||||
17505 | /// Determine whether the given integral value is representable within | ||||
17506 | /// the given type T. | ||||
17507 | static bool isRepresentableIntegerValue(ASTContext &Context, | ||||
17508 | llvm::APSInt &Value, | ||||
17509 | QualType T) { | ||||
17510 | assert((T->isIntegralType(Context) || T->isEnumeralType()) &&(((T->isIntegralType(Context) || T->isEnumeralType()) && "Integral type required!") ? static_cast<void> (0) : __assert_fail ("(T->isIntegralType(Context) || T->isEnumeralType()) && \"Integral type required!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 17511, __PRETTY_FUNCTION__)) | ||||
17511 | "Integral type required!")(((T->isIntegralType(Context) || T->isEnumeralType()) && "Integral type required!") ? static_cast<void> (0) : __assert_fail ("(T->isIntegralType(Context) || T->isEnumeralType()) && \"Integral type required!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 17511, __PRETTY_FUNCTION__)); | ||||
17512 | unsigned BitWidth = Context.getIntWidth(T); | ||||
17513 | |||||
17514 | if (Value.isUnsigned() || Value.isNonNegative()) { | ||||
17515 | if (T->isSignedIntegerOrEnumerationType()) | ||||
17516 | --BitWidth; | ||||
17517 | return Value.getActiveBits() <= BitWidth; | ||||
17518 | } | ||||
17519 | return Value.getMinSignedBits() <= BitWidth; | ||||
17520 | } | ||||
17521 | |||||
17522 | // Given an integral type, return the next larger integral type | ||||
17523 | // (or a NULL type of no such type exists). | ||||
17524 | static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { | ||||
17525 | // FIXME: Int128/UInt128 support, which also needs to be introduced into | ||||
17526 | // enum checking below. | ||||
17527 | assert((T->isIntegralType(Context) ||(((T->isIntegralType(Context) || T->isEnumeralType()) && "Integral type required!") ? static_cast<void> (0) : __assert_fail ("(T->isIntegralType(Context) || T->isEnumeralType()) && \"Integral type required!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 17528, __PRETTY_FUNCTION__)) | ||||
17528 | T->isEnumeralType()) && "Integral type required!")(((T->isIntegralType(Context) || T->isEnumeralType()) && "Integral type required!") ? static_cast<void> (0) : __assert_fail ("(T->isIntegralType(Context) || T->isEnumeralType()) && \"Integral type required!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 17528, __PRETTY_FUNCTION__)); | ||||
17529 | const unsigned NumTypes = 4; | ||||
17530 | QualType SignedIntegralTypes[NumTypes] = { | ||||
17531 | Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy | ||||
17532 | }; | ||||
17533 | QualType UnsignedIntegralTypes[NumTypes] = { | ||||
17534 | Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, | ||||
17535 | Context.UnsignedLongLongTy | ||||
17536 | }; | ||||
17537 | |||||
17538 | unsigned BitWidth = Context.getTypeSize(T); | ||||
17539 | QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes | ||||
17540 | : UnsignedIntegralTypes; | ||||
17541 | for (unsigned I = 0; I != NumTypes; ++I) | ||||
17542 | if (Context.getTypeSize(Types[I]) > BitWidth) | ||||
17543 | return Types[I]; | ||||
17544 | |||||
17545 | return QualType(); | ||||
17546 | } | ||||
17547 | |||||
17548 | EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, | ||||
17549 | EnumConstantDecl *LastEnumConst, | ||||
17550 | SourceLocation IdLoc, | ||||
17551 | IdentifierInfo *Id, | ||||
17552 | Expr *Val) { | ||||
17553 | unsigned IntWidth = Context.getTargetInfo().getIntWidth(); | ||||
17554 | llvm::APSInt EnumVal(IntWidth); | ||||
17555 | QualType EltTy; | ||||
17556 | |||||
17557 | if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) | ||||
17558 | Val = nullptr; | ||||
17559 | |||||
17560 | if (Val) | ||||
17561 | Val = DefaultLvalueConversion(Val).get(); | ||||
17562 | |||||
17563 | if (Val) { | ||||
17564 | if (Enum->isDependentType() || Val->isTypeDependent()) | ||||
17565 | EltTy = Context.DependentTy; | ||||
17566 | else { | ||||
17567 | // FIXME: We don't allow folding in C++11 mode for an enum with a fixed | ||||
17568 | // underlying type, but do allow it in all other contexts. | ||||
17569 | if (getLangOpts().CPlusPlus11 && Enum->isFixed()) { | ||||
17570 | // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the | ||||
17571 | // constant-expression in the enumerator-definition shall be a converted | ||||
17572 | // constant expression of the underlying type. | ||||
17573 | EltTy = Enum->getIntegerType(); | ||||
17574 | ExprResult Converted = | ||||
17575 | CheckConvertedConstantExpression(Val, EltTy, EnumVal, | ||||
17576 | CCEK_Enumerator); | ||||
17577 | if (Converted.isInvalid()) | ||||
17578 | Val = nullptr; | ||||
17579 | else | ||||
17580 | Val = Converted.get(); | ||||
17581 | } else if (!Val->isValueDependent() && | ||||
17582 | !(Val = | ||||
17583 | VerifyIntegerConstantExpression(Val, &EnumVal, AllowFold) | ||||
17584 | .get())) { | ||||
17585 | // C99 6.7.2.2p2: Make sure we have an integer constant expression. | ||||
17586 | } else { | ||||
17587 | if (Enum->isComplete()) { | ||||
17588 | EltTy = Enum->getIntegerType(); | ||||
17589 | |||||
17590 | // In Obj-C and Microsoft mode, require the enumeration value to be | ||||
17591 | // representable in the underlying type of the enumeration. In C++11, | ||||
17592 | // we perform a non-narrowing conversion as part of converted constant | ||||
17593 | // expression checking. | ||||
17594 | if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { | ||||
17595 | if (Context.getTargetInfo() | ||||
17596 | .getTriple() | ||||
17597 | .isWindowsMSVCEnvironment()) { | ||||
17598 | Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; | ||||
17599 | } else { | ||||
17600 | Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; | ||||
17601 | } | ||||
17602 | } | ||||
17603 | |||||
17604 | // Cast to the underlying type. | ||||
17605 | Val = ImpCastExprToType(Val, EltTy, | ||||
17606 | EltTy->isBooleanType() ? CK_IntegralToBoolean | ||||
17607 | : CK_IntegralCast) | ||||
17608 | .get(); | ||||
17609 | } else if (getLangOpts().CPlusPlus) { | ||||
17610 | // C++11 [dcl.enum]p5: | ||||
17611 | // If the underlying type is not fixed, the type of each enumerator | ||||
17612 | // is the type of its initializing value: | ||||
17613 | // - If an initializer is specified for an enumerator, the | ||||
17614 | // initializing value has the same type as the expression. | ||||
17615 | EltTy = Val->getType(); | ||||
17616 | } else { | ||||
17617 | // C99 6.7.2.2p2: | ||||
17618 | // The expression that defines the value of an enumeration constant | ||||
17619 | // shall be an integer constant expression that has a value | ||||
17620 | // representable as an int. | ||||
17621 | |||||
17622 | // Complain if the value is not representable in an int. | ||||
17623 | if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) | ||||
17624 | Diag(IdLoc, diag::ext_enum_value_not_int) | ||||
17625 | << EnumVal.toString(10) << Val->getSourceRange() | ||||
17626 | << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); | ||||
17627 | else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { | ||||
17628 | // Force the type of the expression to 'int'. | ||||
17629 | Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).get(); | ||||
17630 | } | ||||
17631 | EltTy = Val->getType(); | ||||
17632 | } | ||||
17633 | } | ||||
17634 | } | ||||
17635 | } | ||||
17636 | |||||
17637 | if (!Val) { | ||||
17638 | if (Enum->isDependentType()) | ||||
17639 | EltTy = Context.DependentTy; | ||||
17640 | else if (!LastEnumConst) { | ||||
17641 | // C++0x [dcl.enum]p5: | ||||
17642 | // If the underlying type is not fixed, the type of each enumerator | ||||
17643 | // is the type of its initializing value: | ||||
17644 | // - If no initializer is specified for the first enumerator, the | ||||
17645 | // initializing value has an unspecified integral type. | ||||
17646 | // | ||||
17647 | // GCC uses 'int' for its unspecified integral type, as does | ||||
17648 | // C99 6.7.2.2p3. | ||||
17649 | if (Enum->isFixed()) { | ||||
17650 | EltTy = Enum->getIntegerType(); | ||||
17651 | } | ||||
17652 | else { | ||||
17653 | EltTy = Context.IntTy; | ||||
17654 | } | ||||
17655 | } else { | ||||
17656 | // Assign the last value + 1. | ||||
17657 | EnumVal = LastEnumConst->getInitVal(); | ||||
17658 | ++EnumVal; | ||||
17659 | EltTy = LastEnumConst->getType(); | ||||
17660 | |||||
17661 | // Check for overflow on increment. | ||||
17662 | if (EnumVal < LastEnumConst->getInitVal()) { | ||||
17663 | // C++0x [dcl.enum]p5: | ||||
17664 | // If the underlying type is not fixed, the type of each enumerator | ||||
17665 | // is the type of its initializing value: | ||||
17666 | // | ||||
17667 | // - Otherwise the type of the initializing value is the same as | ||||
17668 | // the type of the initializing value of the preceding enumerator | ||||
17669 | // unless the incremented value is not representable in that type, | ||||
17670 | // in which case the type is an unspecified integral type | ||||
17671 | // sufficient to contain the incremented value. If no such type | ||||
17672 | // exists, the program is ill-formed. | ||||
17673 | QualType T = getNextLargerIntegralType(Context, EltTy); | ||||
17674 | if (T.isNull() || Enum->isFixed()) { | ||||
17675 | // There is no integral type larger enough to represent this | ||||
17676 | // value. Complain, then allow the value to wrap around. | ||||
17677 | EnumVal = LastEnumConst->getInitVal(); | ||||
17678 | EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); | ||||
17679 | ++EnumVal; | ||||
17680 | if (Enum->isFixed()) | ||||
17681 | // When the underlying type is fixed, this is ill-formed. | ||||
17682 | Diag(IdLoc, diag::err_enumerator_wrapped) | ||||
17683 | << EnumVal.toString(10) | ||||
17684 | << EltTy; | ||||
17685 | else | ||||
17686 | Diag(IdLoc, diag::ext_enumerator_increment_too_large) | ||||
17687 | << EnumVal.toString(10); | ||||
17688 | } else { | ||||
17689 | EltTy = T; | ||||
17690 | } | ||||
17691 | |||||
17692 | // Retrieve the last enumerator's value, extent that type to the | ||||
17693 | // type that is supposed to be large enough to represent the incremented | ||||
17694 | // value, then increment. | ||||
17695 | EnumVal = LastEnumConst->getInitVal(); | ||||
17696 | EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); | ||||
17697 | EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); | ||||
17698 | ++EnumVal; | ||||
17699 | |||||
17700 | // If we're not in C++, diagnose the overflow of enumerator values, | ||||
17701 | // which in C99 means that the enumerator value is not representable in | ||||
17702 | // an int (C99 6.7.2.2p2). However, we support GCC's extension that | ||||
17703 | // permits enumerator values that are representable in some larger | ||||
17704 | // integral type. | ||||
17705 | if (!getLangOpts().CPlusPlus && !T.isNull()) | ||||
17706 | Diag(IdLoc, diag::warn_enum_value_overflow); | ||||
17707 | } else if (!getLangOpts().CPlusPlus && | ||||
17708 | !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { | ||||
17709 | // Enforce C99 6.7.2.2p2 even when we compute the next value. | ||||
17710 | Diag(IdLoc, diag::ext_enum_value_not_int) | ||||
17711 | << EnumVal.toString(10) << 1; | ||||
17712 | } | ||||
17713 | } | ||||
17714 | } | ||||
17715 | |||||
17716 | if (!EltTy->isDependentType()) { | ||||
17717 | // Make the enumerator value match the signedness and size of the | ||||
17718 | // enumerator's type. | ||||
17719 | EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); | ||||
17720 | EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); | ||||
17721 | } | ||||
17722 | |||||
17723 | return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, | ||||
17724 | Val, EnumVal); | ||||
17725 | } | ||||
17726 | |||||
17727 | Sema::SkipBodyInfo Sema::shouldSkipAnonEnumBody(Scope *S, IdentifierInfo *II, | ||||
17728 | SourceLocation IILoc) { | ||||
17729 | if (!(getLangOpts().Modules || getLangOpts().ModulesLocalVisibility) || | ||||
17730 | !getLangOpts().CPlusPlus) | ||||
17731 | return SkipBodyInfo(); | ||||
17732 | |||||
17733 | // We have an anonymous enum definition. Look up the first enumerator to | ||||
17734 | // determine if we should merge the definition with an existing one and | ||||
17735 | // skip the body. | ||||
17736 | NamedDecl *PrevDecl = LookupSingleName(S, II, IILoc, LookupOrdinaryName, | ||||
17737 | forRedeclarationInCurContext()); | ||||
17738 | auto *PrevECD = dyn_cast_or_null<EnumConstantDecl>(PrevDecl); | ||||
17739 | if (!PrevECD) | ||||
17740 | return SkipBodyInfo(); | ||||
17741 | |||||
17742 | EnumDecl *PrevED = cast<EnumDecl>(PrevECD->getDeclContext()); | ||||
17743 | NamedDecl *Hidden; | ||||
17744 | if (!PrevED->getDeclName() && !hasVisibleDefinition(PrevED, &Hidden)) { | ||||
17745 | SkipBodyInfo Skip; | ||||
17746 | Skip.Previous = Hidden; | ||||
17747 | return Skip; | ||||
17748 | } | ||||
17749 | |||||
17750 | return SkipBodyInfo(); | ||||
17751 | } | ||||
17752 | |||||
17753 | Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, | ||||
17754 | SourceLocation IdLoc, IdentifierInfo *Id, | ||||
17755 | const ParsedAttributesView &Attrs, | ||||
17756 | SourceLocation EqualLoc, Expr *Val) { | ||||
17757 | EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); | ||||
17758 | EnumConstantDecl *LastEnumConst = | ||||
17759 | cast_or_null<EnumConstantDecl>(lastEnumConst); | ||||
17760 | |||||
17761 | // The scope passed in may not be a decl scope. Zip up the scope tree until | ||||
17762 | // we find one that is. | ||||
17763 | S = getNonFieldDeclScope(S); | ||||
17764 | |||||
17765 | // Verify that there isn't already something declared with this name in this | ||||
17766 | // scope. | ||||
17767 | LookupResult R(*this, Id, IdLoc, LookupOrdinaryName, ForVisibleRedeclaration); | ||||
17768 | LookupName(R, S); | ||||
17769 | NamedDecl *PrevDecl = R.getAsSingle<NamedDecl>(); | ||||
17770 | |||||
17771 | if (PrevDecl && PrevDecl->isTemplateParameter()) { | ||||
17772 | // Maybe we will complain about the shadowed template parameter. | ||||
17773 | DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); | ||||
17774 | // Just pretend that we didn't see the previous declaration. | ||||
17775 | PrevDecl = nullptr; | ||||
17776 | } | ||||
17777 | |||||
17778 | // C++ [class.mem]p15: | ||||
17779 | // If T is the name of a class, then each of the following shall have a name | ||||
17780 | // different from T: | ||||
17781 | // - every enumerator of every member of class T that is an unscoped | ||||
17782 | // enumerated type | ||||
17783 | if (getLangOpts().CPlusPlus && !TheEnumDecl->isScoped()) | ||||
17784 | DiagnoseClassNameShadow(TheEnumDecl->getDeclContext(), | ||||
17785 | DeclarationNameInfo(Id, IdLoc)); | ||||
17786 | |||||
17787 | EnumConstantDecl *New = | ||||
17788 | CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); | ||||
17789 | if (!New) | ||||
17790 | return nullptr; | ||||
17791 | |||||
17792 | if (PrevDecl) { | ||||
17793 | if (!TheEnumDecl->isScoped() && isa<ValueDecl>(PrevDecl)) { | ||||
17794 | // Check for other kinds of shadowing not already handled. | ||||
17795 | CheckShadow(New, PrevDecl, R); | ||||
17796 | } | ||||
17797 | |||||
17798 | // When in C++, we may get a TagDecl with the same name; in this case the | ||||
17799 | // enum constant will 'hide' the tag. | ||||
17800 | assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) &&(((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && "Received TagDecl when not in C++!") ? static_cast<void> (0) : __assert_fail ("(getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && \"Received TagDecl when not in C++!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 17801, __PRETTY_FUNCTION__)) | ||||
17801 | "Received TagDecl when not in C++!")(((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && "Received TagDecl when not in C++!") ? static_cast<void> (0) : __assert_fail ("(getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && \"Received TagDecl when not in C++!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 17801, __PRETTY_FUNCTION__)); | ||||
17802 | if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { | ||||
17803 | if (isa<EnumConstantDecl>(PrevDecl)) | ||||
17804 | Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; | ||||
17805 | else | ||||
17806 | Diag(IdLoc, diag::err_redefinition) << Id; | ||||
17807 | notePreviousDefinition(PrevDecl, IdLoc); | ||||
17808 | return nullptr; | ||||
17809 | } | ||||
17810 | } | ||||
17811 | |||||
17812 | // Process attributes. | ||||
17813 | ProcessDeclAttributeList(S, New, Attrs); | ||||
17814 | AddPragmaAttributes(S, New); | ||||
17815 | |||||
17816 | // Register this decl in the current scope stack. | ||||
17817 | New->setAccess(TheEnumDecl->getAccess()); | ||||
17818 | PushOnScopeChains(New, S); | ||||
17819 | |||||
17820 | ActOnDocumentableDecl(New); | ||||
17821 | |||||
17822 | return New; | ||||
17823 | } | ||||
17824 | |||||
17825 | // Returns true when the enum initial expression does not trigger the | ||||
17826 | // duplicate enum warning. A few common cases are exempted as follows: | ||||
17827 | // Element2 = Element1 | ||||
17828 | // Element2 = Element1 + 1 | ||||
17829 | // Element2 = Element1 - 1 | ||||
17830 | // Where Element2 and Element1 are from the same enum. | ||||
17831 | static bool ValidDuplicateEnum(EnumConstantDecl *ECD, EnumDecl *Enum) { | ||||
17832 | Expr *InitExpr = ECD->getInitExpr(); | ||||
17833 | if (!InitExpr) | ||||
17834 | return true; | ||||
17835 | InitExpr = InitExpr->IgnoreImpCasts(); | ||||
17836 | |||||
17837 | if (BinaryOperator *BO = dyn_cast<BinaryOperator>(InitExpr)) { | ||||
17838 | if (!BO->isAdditiveOp()) | ||||
17839 | return true; | ||||
17840 | IntegerLiteral *IL = dyn_cast<IntegerLiteral>(BO->getRHS()); | ||||
17841 | if (!IL) | ||||
17842 | return true; | ||||
17843 | if (IL->getValue() != 1) | ||||
17844 | return true; | ||||
17845 | |||||
17846 | InitExpr = BO->getLHS(); | ||||
17847 | } | ||||
17848 | |||||
17849 | // This checks if the elements are from the same enum. | ||||
17850 | DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(InitExpr); | ||||
17851 | if (!DRE) | ||||
17852 | return true; | ||||
17853 | |||||
17854 | EnumConstantDecl *EnumConstant = dyn_cast<EnumConstantDecl>(DRE->getDecl()); | ||||
17855 | if (!EnumConstant) | ||||
17856 | return true; | ||||
17857 | |||||
17858 | if (cast<EnumDecl>(TagDecl::castFromDeclContext(ECD->getDeclContext())) != | ||||
17859 | Enum) | ||||
17860 | return true; | ||||
17861 | |||||
17862 | return false; | ||||
17863 | } | ||||
17864 | |||||
17865 | // Emits a warning when an element is implicitly set a value that | ||||
17866 | // a previous element has already been set to. | ||||
17867 | static void CheckForDuplicateEnumValues(Sema &S, ArrayRef<Decl *> Elements, | ||||
17868 | EnumDecl *Enum, QualType EnumType) { | ||||
17869 | // Avoid anonymous enums | ||||
17870 | if (!Enum->getIdentifier()) | ||||
17871 | return; | ||||
17872 | |||||
17873 | // Only check for small enums. | ||||
17874 | if (Enum->getNumPositiveBits() > 63 || Enum->getNumNegativeBits() > 64) | ||||
17875 | return; | ||||
17876 | |||||
17877 | if (S.Diags.isIgnored(diag::warn_duplicate_enum_values, Enum->getLocation())) | ||||
17878 | return; | ||||
17879 | |||||
17880 | typedef SmallVector<EnumConstantDecl *, 3> ECDVector; | ||||
17881 | typedef SmallVector<std::unique_ptr<ECDVector>, 3> DuplicatesVector; | ||||
17882 | |||||
17883 | typedef llvm::PointerUnion<EnumConstantDecl*, ECDVector*> DeclOrVector; | ||||
17884 | |||||
17885 | // DenseMaps cannot contain the all ones int64_t value, so use unordered_map. | ||||
17886 | typedef std::unordered_map<int64_t, DeclOrVector> ValueToVectorMap; | ||||
17887 | |||||
17888 | // Use int64_t as a key to avoid needing special handling for map keys. | ||||
17889 | auto EnumConstantToKey = [](const EnumConstantDecl *D) { | ||||
17890 | llvm::APSInt Val = D->getInitVal(); | ||||
17891 | return Val.isSigned() ? Val.getSExtValue() : Val.getZExtValue(); | ||||
17892 | }; | ||||
17893 | |||||
17894 | DuplicatesVector DupVector; | ||||
17895 | ValueToVectorMap EnumMap; | ||||
17896 | |||||
17897 | // Populate the EnumMap with all values represented by enum constants without | ||||
17898 | // an initializer. | ||||
17899 | for (auto *Element : Elements) { | ||||
17900 | EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Element); | ||||
17901 | |||||
17902 | // Null EnumConstantDecl means a previous diagnostic has been emitted for | ||||
17903 | // this constant. Skip this enum since it may be ill-formed. | ||||
17904 | if (!ECD) { | ||||
17905 | return; | ||||
17906 | } | ||||
17907 | |||||
17908 | // Constants with initalizers are handled in the next loop. | ||||
17909 | if (ECD->getInitExpr()) | ||||
17910 | continue; | ||||
17911 | |||||
17912 | // Duplicate values are handled in the next loop. | ||||
17913 | EnumMap.insert({EnumConstantToKey(ECD), ECD}); | ||||
17914 | } | ||||
17915 | |||||
17916 | if (EnumMap.size() == 0) | ||||
17917 | return; | ||||
17918 | |||||
17919 | // Create vectors for any values that has duplicates. | ||||
17920 | for (auto *Element : Elements) { | ||||
17921 | // The last loop returned if any constant was null. | ||||
17922 | EnumConstantDecl *ECD = cast<EnumConstantDecl>(Element); | ||||
17923 | if (!ValidDuplicateEnum(ECD, Enum)) | ||||
17924 | continue; | ||||
17925 | |||||
17926 | auto Iter = EnumMap.find(EnumConstantToKey(ECD)); | ||||
17927 | if (Iter == EnumMap.end()) | ||||
17928 | continue; | ||||
17929 | |||||
17930 | DeclOrVector& Entry = Iter->second; | ||||
17931 | if (EnumConstantDecl *D = Entry.dyn_cast<EnumConstantDecl*>()) { | ||||
17932 | // Ensure constants are different. | ||||
17933 | if (D == ECD) | ||||
17934 | continue; | ||||
17935 | |||||
17936 | // Create new vector and push values onto it. | ||||
17937 | auto Vec = std::make_unique<ECDVector>(); | ||||
17938 | Vec->push_back(D); | ||||
17939 | Vec->push_back(ECD); | ||||
17940 | |||||
17941 | // Update entry to point to the duplicates vector. | ||||
17942 | Entry = Vec.get(); | ||||
17943 | |||||
17944 | // Store the vector somewhere we can consult later for quick emission of | ||||
17945 | // diagnostics. | ||||
17946 | DupVector.emplace_back(std::move(Vec)); | ||||
17947 | continue; | ||||
17948 | } | ||||
17949 | |||||
17950 | ECDVector *Vec = Entry.get<ECDVector*>(); | ||||
17951 | // Make sure constants are not added more than once. | ||||
17952 | if (*Vec->begin() == ECD) | ||||
17953 | continue; | ||||
17954 | |||||
17955 | Vec->push_back(ECD); | ||||
17956 | } | ||||
17957 | |||||
17958 | // Emit diagnostics. | ||||
17959 | for (const auto &Vec : DupVector) { | ||||
17960 | assert(Vec->size() > 1 && "ECDVector should have at least 2 elements.")((Vec->size() > 1 && "ECDVector should have at least 2 elements." ) ? static_cast<void> (0) : __assert_fail ("Vec->size() > 1 && \"ECDVector should have at least 2 elements.\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 17960, __PRETTY_FUNCTION__)); | ||||
17961 | |||||
17962 | // Emit warning for one enum constant. | ||||
17963 | auto *FirstECD = Vec->front(); | ||||
17964 | S.Diag(FirstECD->getLocation(), diag::warn_duplicate_enum_values) | ||||
17965 | << FirstECD << FirstECD->getInitVal().toString(10) | ||||
17966 | << FirstECD->getSourceRange(); | ||||
17967 | |||||
17968 | // Emit one note for each of the remaining enum constants with | ||||
17969 | // the same value. | ||||
17970 | for (auto *ECD : llvm::make_range(Vec->begin() + 1, Vec->end())) | ||||
17971 | S.Diag(ECD->getLocation(), diag::note_duplicate_element) | ||||
17972 | << ECD << ECD->getInitVal().toString(10) | ||||
17973 | << ECD->getSourceRange(); | ||||
17974 | } | ||||
17975 | } | ||||
17976 | |||||
17977 | bool Sema::IsValueInFlagEnum(const EnumDecl *ED, const llvm::APInt &Val, | ||||
17978 | bool AllowMask) const { | ||||
17979 | assert(ED->isClosedFlag() && "looking for value in non-flag or open enum")((ED->isClosedFlag() && "looking for value in non-flag or open enum" ) ? static_cast<void> (0) : __assert_fail ("ED->isClosedFlag() && \"looking for value in non-flag or open enum\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 17979, __PRETTY_FUNCTION__)); | ||||
17980 | assert(ED->isCompleteDefinition() && "expected enum definition")((ED->isCompleteDefinition() && "expected enum definition" ) ? static_cast<void> (0) : __assert_fail ("ED->isCompleteDefinition() && \"expected enum definition\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 17980, __PRETTY_FUNCTION__)); | ||||
17981 | |||||
17982 | auto R = FlagBitsCache.insert(std::make_pair(ED, llvm::APInt())); | ||||
17983 | llvm::APInt &FlagBits = R.first->second; | ||||
17984 | |||||
17985 | if (R.second) { | ||||
17986 | for (auto *E : ED->enumerators()) { | ||||
17987 | const auto &EVal = E->getInitVal(); | ||||
17988 | // Only single-bit enumerators introduce new flag values. | ||||
17989 | if (EVal.isPowerOf2()) | ||||
17990 | FlagBits = FlagBits.zextOrSelf(EVal.getBitWidth()) | EVal; | ||||
17991 | } | ||||
17992 | } | ||||
17993 | |||||
17994 | // A value is in a flag enum if either its bits are a subset of the enum's | ||||
17995 | // flag bits (the first condition) or we are allowing masks and the same is | ||||
17996 | // true of its complement (the second condition). When masks are allowed, we | ||||
17997 | // allow the common idiom of ~(enum1 | enum2) to be a valid enum value. | ||||
17998 | // | ||||
17999 | // While it's true that any value could be used as a mask, the assumption is | ||||
18000 | // that a mask will have all of the insignificant bits set. Anything else is | ||||
18001 | // likely a logic error. | ||||
18002 | llvm::APInt FlagMask = ~FlagBits.zextOrTrunc(Val.getBitWidth()); | ||||
18003 | return !(FlagMask & Val) || (AllowMask && !(FlagMask & ~Val)); | ||||
18004 | } | ||||
18005 | |||||
18006 | void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceRange BraceRange, | ||||
18007 | Decl *EnumDeclX, ArrayRef<Decl *> Elements, Scope *S, | ||||
18008 | const ParsedAttributesView &Attrs) { | ||||
18009 | EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); | ||||
18010 | QualType EnumType = Context.getTypeDeclType(Enum); | ||||
18011 | |||||
18012 | ProcessDeclAttributeList(S, Enum, Attrs); | ||||
18013 | |||||
18014 | if (Enum->isDependentType()) { | ||||
18015 | for (unsigned i = 0, e = Elements.size(); i != e; ++i) { | ||||
18016 | EnumConstantDecl *ECD = | ||||
18017 | cast_or_null<EnumConstantDecl>(Elements[i]); | ||||
18018 | if (!ECD) continue; | ||||
18019 | |||||
18020 | ECD->setType(EnumType); | ||||
18021 | } | ||||
18022 | |||||
18023 | Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); | ||||
18024 | return; | ||||
18025 | } | ||||
18026 | |||||
18027 | // TODO: If the result value doesn't fit in an int, it must be a long or long | ||||
18028 | // long value. ISO C does not support this, but GCC does as an extension, | ||||
18029 | // emit a warning. | ||||
18030 | unsigned IntWidth = Context.getTargetInfo().getIntWidth(); | ||||
18031 | unsigned CharWidth = Context.getTargetInfo().getCharWidth(); | ||||
18032 | unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); | ||||
18033 | |||||
18034 | // Verify that all the values are okay, compute the size of the values, and | ||||
18035 | // reverse the list. | ||||
18036 | unsigned NumNegativeBits = 0; | ||||
18037 | unsigned NumPositiveBits = 0; | ||||
18038 | |||||
18039 | // Keep track of whether all elements have type int. | ||||
18040 | bool AllElementsInt = true; | ||||
18041 | |||||
18042 | for (unsigned i = 0, e = Elements.size(); i != e; ++i) { | ||||
18043 | EnumConstantDecl *ECD = | ||||
18044 | cast_or_null<EnumConstantDecl>(Elements[i]); | ||||
18045 | if (!ECD) continue; // Already issued a diagnostic. | ||||
18046 | |||||
18047 | const llvm::APSInt &InitVal = ECD->getInitVal(); | ||||
18048 | |||||
18049 | // Keep track of the size of positive and negative values. | ||||
18050 | if (InitVal.isUnsigned() || InitVal.isNonNegative()) | ||||
18051 | NumPositiveBits = std::max(NumPositiveBits, | ||||
18052 | (unsigned)InitVal.getActiveBits()); | ||||
18053 | else | ||||
18054 | NumNegativeBits = std::max(NumNegativeBits, | ||||
18055 | (unsigned)InitVal.getMinSignedBits()); | ||||
18056 | |||||
18057 | // Keep track of whether every enum element has type int (very common). | ||||
18058 | if (AllElementsInt) | ||||
18059 | AllElementsInt = ECD->getType() == Context.IntTy; | ||||
18060 | } | ||||
18061 | |||||
18062 | // Figure out the type that should be used for this enum. | ||||
18063 | QualType BestType; | ||||
18064 | unsigned BestWidth; | ||||
18065 | |||||
18066 | // C++0x N3000 [conv.prom]p3: | ||||
18067 | // An rvalue of an unscoped enumeration type whose underlying | ||||
18068 | // type is not fixed can be converted to an rvalue of the first | ||||
18069 | // of the following types that can represent all the values of | ||||
18070 | // the enumeration: int, unsigned int, long int, unsigned long | ||||
18071 | // int, long long int, or unsigned long long int. | ||||
18072 | // C99 6.4.4.3p2: | ||||
18073 | // An identifier declared as an enumeration constant has type int. | ||||
18074 | // The C99 rule is modified by a gcc extension | ||||
18075 | QualType BestPromotionType; | ||||
18076 | |||||
18077 | bool Packed = Enum->hasAttr<PackedAttr>(); | ||||
18078 | // -fshort-enums is the equivalent to specifying the packed attribute on all | ||||
18079 | // enum definitions. | ||||
18080 | if (LangOpts.ShortEnums) | ||||
18081 | Packed = true; | ||||
18082 | |||||
18083 | // If the enum already has a type because it is fixed or dictated by the | ||||
18084 | // target, promote that type instead of analyzing the enumerators. | ||||
18085 | if (Enum->isComplete()) { | ||||
18086 | BestType = Enum->getIntegerType(); | ||||
18087 | if (BestType->isPromotableIntegerType()) | ||||
18088 | BestPromotionType = Context.getPromotedIntegerType(BestType); | ||||
18089 | else | ||||
18090 | BestPromotionType = BestType; | ||||
18091 | |||||
18092 | BestWidth = Context.getIntWidth(BestType); | ||||
18093 | } | ||||
18094 | else if (NumNegativeBits) { | ||||
18095 | // If there is a negative value, figure out the smallest integer type (of | ||||
18096 | // int/long/longlong) that fits. | ||||
18097 | // If it's packed, check also if it fits a char or a short. | ||||
18098 | if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { | ||||
18099 | BestType = Context.SignedCharTy; | ||||
18100 | BestWidth = CharWidth; | ||||
18101 | } else if (Packed && NumNegativeBits <= ShortWidth && | ||||
18102 | NumPositiveBits < ShortWidth) { | ||||
18103 | BestType = Context.ShortTy; | ||||
18104 | BestWidth = ShortWidth; | ||||
18105 | } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { | ||||
18106 | BestType = Context.IntTy; | ||||
18107 | BestWidth = IntWidth; | ||||
18108 | } else { | ||||
18109 | BestWidth = Context.getTargetInfo().getLongWidth(); | ||||
18110 | |||||
18111 | if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { | ||||
18112 | BestType = Context.LongTy; | ||||
18113 | } else { | ||||
18114 | BestWidth = Context.getTargetInfo().getLongLongWidth(); | ||||
18115 | |||||
18116 | if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) | ||||
18117 | Diag(Enum->getLocation(), diag::ext_enum_too_large); | ||||
18118 | BestType = Context.LongLongTy; | ||||
18119 | } | ||||
18120 | } | ||||
18121 | BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); | ||||
18122 | } else { | ||||
18123 | // If there is no negative value, figure out the smallest type that fits | ||||
18124 | // all of the enumerator values. | ||||
18125 | // If it's packed, check also if it fits a char or a short. | ||||
18126 | if (Packed && NumPositiveBits <= CharWidth) { | ||||
18127 | BestType = Context.UnsignedCharTy; | ||||
18128 | BestPromotionType = Context.IntTy; | ||||
18129 | BestWidth = CharWidth; | ||||
18130 | } else if (Packed && NumPositiveBits <= ShortWidth) { | ||||
18131 | BestType = Context.UnsignedShortTy; | ||||
18132 | BestPromotionType = Context.IntTy; | ||||
18133 | BestWidth = ShortWidth; | ||||
18134 | } else if (NumPositiveBits <= IntWidth) { | ||||
18135 | BestType = Context.UnsignedIntTy; | ||||
18136 | BestWidth = IntWidth; | ||||
18137 | BestPromotionType | ||||
18138 | = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) | ||||
18139 | ? Context.UnsignedIntTy : Context.IntTy; | ||||
18140 | } else if (NumPositiveBits <= | ||||
18141 | (BestWidth = Context.getTargetInfo().getLongWidth())) { | ||||
18142 | BestType = Context.UnsignedLongTy; | ||||
18143 | BestPromotionType | ||||
18144 | = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) | ||||
18145 | ? Context.UnsignedLongTy : Context.LongTy; | ||||
18146 | } else { | ||||
18147 | BestWidth = Context.getTargetInfo().getLongLongWidth(); | ||||
18148 | assert(NumPositiveBits <= BestWidth &&((NumPositiveBits <= BestWidth && "How could an initializer get larger than ULL?" ) ? static_cast<void> (0) : __assert_fail ("NumPositiveBits <= BestWidth && \"How could an initializer get larger than ULL?\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 18149, __PRETTY_FUNCTION__)) | ||||
18149 | "How could an initializer get larger than ULL?")((NumPositiveBits <= BestWidth && "How could an initializer get larger than ULL?" ) ? static_cast<void> (0) : __assert_fail ("NumPositiveBits <= BestWidth && \"How could an initializer get larger than ULL?\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/lib/Sema/SemaDecl.cpp" , 18149, __PRETTY_FUNCTION__)); | ||||
18150 | BestType = Context.UnsignedLongLongTy; | ||||
18151 | BestPromotionType | ||||
18152 | = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) | ||||
18153 | ? Context.UnsignedLongLongTy : Context.LongLongTy; | ||||
18154 | } | ||||
18155 | } | ||||
18156 | |||||
18157 | // Loop over all of the enumerator constants, changing their types to match | ||||
18158 | // the type of the enum if needed. | ||||
18159 | for (auto *D : Elements) { | ||||
18160 | auto *ECD = cast_or_null<EnumConstantDecl>(D); | ||||
18161 | if (!ECD) continue; // Already issued a diagnostic. | ||||
18162 | |||||
18163 | // Standard C says the enumerators have int type, but we allow, as an | ||||
18164 | // extension, the enumerators to be larger than int size. If each | ||||
18165 | // enumerator value fits in an int, type it as an int, otherwise type it the | ||||
18166 | // same as the enumerator decl itself. This means that in "enum { X = 1U }" | ||||
18167 | // that X has type 'int', not 'unsigned'. | ||||
18168 | |||||
18169 | // Determine whether the value fits into an int. | ||||
18170 | llvm::APSInt InitVal = ECD->getInitVal(); | ||||
18171 | |||||
18172 | // If it fits into an integer type, force it. Otherwise force it to match | ||||
18173 | // the enum decl type. | ||||
18174 | QualType NewTy; | ||||
18175 | unsigned NewWidth; | ||||
18176 | bool NewSign; | ||||
18177 | if (!getLangOpts().CPlusPlus && | ||||
18178 | !Enum->isFixed() && | ||||
18179 | isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { | ||||
18180 | NewTy = Context.IntTy; | ||||
18181 | NewWidth = IntWidth; | ||||
18182 | NewSign = true; | ||||
18183 | } else if (ECD->getType() == BestType) { | ||||
18184 | // Already the right type! | ||||
18185 | if (getLangOpts().CPlusPlus) | ||||
18186 | // C++ [dcl.enum]p4: Following the closing brace of an | ||||
18187 | // enum-specifier, each enumerator has the type of its | ||||
18188 | // enumeration. | ||||
18189 | ECD->setType(EnumType); | ||||
18190 | continue; | ||||
18191 | } else { | ||||
18192 | NewTy = BestType; | ||||
18193 | NewWidth = BestWidth; | ||||
18194 | NewSign = BestType->isSignedIntegerOrEnumerationType(); | ||||
18195 | } | ||||
18196 | |||||
18197 | // Adjust the APSInt value. | ||||
18198 | InitVal = InitVal.extOrTrunc(NewWidth); | ||||
18199 | InitVal.setIsSigned(NewSign); | ||||
18200 | ECD->setInitVal(InitVal); | ||||
18201 | |||||
18202 | // Adjust the Expr initializer and type. | ||||
18203 | if (ECD->getInitExpr() && | ||||
18204 | !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) | ||||
18205 | ECD->setInitExpr(ImplicitCastExpr::Create( | ||||
18206 | Context, NewTy, CK_IntegralCast, ECD->getInitExpr(), | ||||
18207 | /*base paths*/ nullptr, VK_RValue, FPOptionsOverride())); | ||||
18208 | if (getLangOpts().CPlusPlus) | ||||
18209 | // C++ [dcl.enum]p4: Following the closing brace of an | ||||
18210 | // enum-specifier, each enumerator has the type of its | ||||
18211 | // enumeration. | ||||
18212 | ECD->setType(EnumType); | ||||
18213 | else | ||||
18214 | ECD->setType(NewTy); | ||||
18215 | } | ||||
18216 | |||||
18217 | Enum->completeDefinition(BestType, BestPromotionType, | ||||
18218 | NumPositiveBits, NumNegativeBits); | ||||
18219 | |||||
18220 | CheckForDuplicateEnumValues(*this, Elements, Enum, EnumType); | ||||
18221 | |||||
18222 | if (Enum->isClosedFlag()) { | ||||
18223 | for (Decl *D : Elements) { | ||||
18224 | EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(D); | ||||
18225 | if (!ECD) continue; // Already issued a diagnostic. | ||||
18226 | |||||
18227 | llvm::APSInt InitVal = ECD->getInitVal(); | ||||
18228 | if (InitVal != 0 && !InitVal.isPowerOf2() && | ||||
18229 | !IsValueInFlagEnum(Enum, InitVal, true)) | ||||
18230 | Diag(ECD->getLocation(), diag::warn_flag_enum_constant_out_of_range) | ||||
18231 | << ECD << Enum; | ||||
18232 | } | ||||
18233 | } | ||||
18234 | |||||
18235 | // Now that the enum type is defined, ensure it's not been underaligned. | ||||
18236 | if (Enum->hasAttrs()) | ||||
18237 | CheckAlignasUnderalignment(Enum); | ||||
18238 | } | ||||
18239 | |||||
18240 | Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, | ||||
18241 | SourceLocation StartLoc, | ||||
18242 | SourceLocation EndLoc) { | ||||
18243 | StringLiteral *AsmString = cast<StringLiteral>(expr); | ||||
18244 | |||||
18245 | FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, | ||||
18246 | AsmString, StartLoc, | ||||
18247 | EndLoc); | ||||
18248 | CurContext->addDecl(New); | ||||
18249 | return New; | ||||
18250 | } | ||||
18251 | |||||
18252 | void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name, | ||||
18253 | IdentifierInfo* AliasName, | ||||
18254 | SourceLocation PragmaLoc, | ||||
18255 | SourceLocation NameLoc, | ||||
18256 | SourceLocation AliasNameLoc) { | ||||
18257 | NamedDecl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, | ||||
18258 | LookupOrdinaryName); | ||||
18259 | AttributeCommonInfo Info(AliasName, SourceRange(AliasNameLoc), | ||||
18260 | AttributeCommonInfo::AS_Pragma); | ||||
18261 | AsmLabelAttr *Attr = AsmLabelAttr::CreateImplicit( | ||||
18262 | Context, AliasName->getName(), /*LiteralLabel=*/true, Info); | ||||
18263 | |||||
18264 | // If a declaration that: | ||||
18265 | // 1) declares a function or a variable | ||||
18266 | // 2) has external linkage | ||||
18267 | // already exists, add a label attribute to it. | ||||
18268 | if (PrevDecl && (isa<FunctionDecl>(PrevDecl) || isa<VarDecl>(PrevDecl))) { | ||||
18269 | if (isDeclExternC(PrevDecl)) | ||||
18270 | PrevDecl->addAttr(Attr); | ||||
18271 | else | ||||
18272 | Diag(PrevDecl->getLocation(), diag::warn_redefine_extname_not_applied) | ||||
18273 | << /*Variable*/(isa<FunctionDecl>(PrevDecl) ? 0 : 1) << PrevDecl; | ||||
18274 | // Otherwise, add a label atttibute to ExtnameUndeclaredIdentifiers. | ||||
18275 | } else | ||||
18276 | (void)ExtnameUndeclaredIdentifiers.insert(std::make_pair(Name, Attr)); | ||||
18277 | } | ||||
18278 | |||||
18279 | void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, | ||||
18280 | SourceLocation PragmaLoc, | ||||
18281 | SourceLocation NameLoc) { | ||||
18282 | Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); | ||||
18283 | |||||
18284 | if (PrevDecl) { | ||||
18285 | PrevDecl->addAttr(WeakAttr::CreateImplicit(Context, PragmaLoc, AttributeCommonInfo::AS_Pragma)); | ||||
18286 | } else { | ||||
18287 | (void)WeakUndeclaredIdentifiers.insert( | ||||
18288 | std::pair<IdentifierInfo*,WeakInfo> | ||||
18289 | (Name, WeakInfo((IdentifierInfo*)nullptr, NameLoc))); | ||||
18290 | } | ||||
18291 | } | ||||
18292 | |||||
18293 | void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, | ||||
18294 | IdentifierInfo* AliasName, | ||||
18295 | SourceLocation PragmaLoc, | ||||
18296 | SourceLocation NameLoc, | ||||
18297 | SourceLocation AliasNameLoc) { | ||||
18298 | Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, | ||||
18299 | LookupOrdinaryName); | ||||
18300 | WeakInfo W = WeakInfo(Name, NameLoc); | ||||
18301 | |||||
18302 | if (PrevDecl && (isa<FunctionDecl>(PrevDecl) || isa<VarDecl>(PrevDecl))) { | ||||
18303 | if (!PrevDecl->hasAttr<AliasAttr>()) | ||||
18304 | if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) | ||||
18305 | DeclApplyPragmaWeak(TUScope, ND, W); | ||||
18306 | } else { | ||||
18307 | (void)WeakUndeclaredIdentifiers.insert( | ||||
18308 | std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); | ||||
18309 | } | ||||
18310 | } | ||||
18311 | |||||
18312 | Decl *Sema::getObjCDeclContext() const { | ||||
18313 | return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); | ||||
18314 | } | ||||
18315 | |||||
18316 | Sema::FunctionEmissionStatus Sema::getEmissionStatus(FunctionDecl *FD, | ||||
18317 | bool Final) { | ||||
18318 | // SYCL functions can be template, so we check if they have appropriate | ||||
18319 | // attribute prior to checking if it is a template. | ||||
18320 | if (LangOpts.SYCLIsDevice && FD->hasAttr<SYCLKernelAttr>()) | ||||
18321 | return FunctionEmissionStatus::Emitted; | ||||
18322 | |||||
18323 | // Templates are emitted when they're instantiated. | ||||
18324 | if (FD->isDependentContext()) | ||||
18325 | return FunctionEmissionStatus::TemplateDiscarded; | ||||
18326 | |||||
18327 | FunctionEmissionStatus OMPES = FunctionEmissionStatus::Unknown; | ||||
18328 | if (LangOpts.OpenMPIsDevice) { | ||||
18329 | Optional<OMPDeclareTargetDeclAttr::DevTypeTy> DevTy = | ||||
18330 | OMPDeclareTargetDeclAttr::getDeviceType(FD->getCanonicalDecl()); | ||||
18331 | if (DevTy.hasValue()) { | ||||
18332 | if (*DevTy == OMPDeclareTargetDeclAttr::DT_Host) | ||||
18333 | OMPES = FunctionEmissionStatus::OMPDiscarded; | ||||
18334 | else if (*DevTy == OMPDeclareTargetDeclAttr::DT_NoHost || | ||||
18335 | *DevTy == OMPDeclareTargetDeclAttr::DT_Any) { | ||||
18336 | OMPES = FunctionEmissionStatus::Emitted; | ||||
18337 | } | ||||
18338 | } | ||||
18339 | } else if (LangOpts.OpenMP) { | ||||
18340 | // In OpenMP 4.5 all the functions are host functions. | ||||
18341 | if (LangOpts.OpenMP <= 45) { | ||||
18342 | OMPES = FunctionEmissionStatus::Emitted; | ||||
18343 | } else { | ||||
18344 | Optional<OMPDeclareTargetDeclAttr::DevTypeTy> DevTy = | ||||
18345 | OMPDeclareTargetDeclAttr::getDeviceType(FD->getCanonicalDecl()); | ||||
18346 | // In OpenMP 5.0 or above, DevTy may be changed later by | ||||
18347 | // #pragma omp declare target to(*) device_type(*). Therefore DevTy | ||||
18348 | // having no value does not imply host. The emission status will be | ||||
18349 | // checked again at the end of compilation unit. | ||||
18350 | if (DevTy.hasValue()) { | ||||
18351 | if (*DevTy == OMPDeclareTargetDeclAttr::DT_NoHost) { | ||||
18352 | OMPES = FunctionEmissionStatus::OMPDiscarded; | ||||
18353 | } else if (*DevTy == OMPDeclareTargetDeclAttr::DT_Host || | ||||
18354 | *DevTy == OMPDeclareTargetDeclAttr::DT_Any) | ||||
18355 | OMPES = FunctionEmissionStatus::Emitted; | ||||
18356 | } else if (Final) | ||||
18357 | OMPES = FunctionEmissionStatus::Emitted; | ||||
18358 | } | ||||
18359 | } | ||||
18360 | if (OMPES == FunctionEmissionStatus::OMPDiscarded || | ||||
18361 | (OMPES == FunctionEmissionStatus::Emitted && !LangOpts.CUDA)) | ||||
18362 | return OMPES; | ||||
18363 | |||||
18364 | if (LangOpts.CUDA) { | ||||
18365 | // When compiling for device, host functions are never emitted. Similarly, | ||||
18366 | // when compiling for host, device and global functions are never emitted. | ||||
18367 | // (Technically, we do emit a host-side stub for global functions, but this | ||||
18368 | // doesn't count for our purposes here.) | ||||
18369 | Sema::CUDAFunctionTarget T = IdentifyCUDATarget(FD); | ||||
18370 | if (LangOpts.CUDAIsDevice && T == Sema::CFT_Host) | ||||
18371 | return FunctionEmissionStatus::CUDADiscarded; | ||||
18372 | if (!LangOpts.CUDAIsDevice && | ||||
18373 | (T == Sema::CFT_Device || T == Sema::CFT_Global)) | ||||
18374 | return FunctionEmissionStatus::CUDADiscarded; | ||||
18375 | |||||
18376 | // Check whether this function is externally visible -- if so, it's | ||||
18377 | // known-emitted. | ||||
18378 | // | ||||
18379 | // We have to check the GVA linkage of the function's *definition* -- if we | ||||
18380 | // only have a declaration, we don't know whether or not the function will | ||||
18381 | // be emitted, because (say) the definition could include "inline". | ||||
18382 | FunctionDecl *Def = FD->getDefinition(); | ||||
18383 | |||||
18384 | if (Def && | ||||
18385 | !isDiscardableGVALinkage(getASTContext().GetGVALinkageForFunction(Def)) | ||||
18386 | && (!LangOpts.OpenMP || OMPES == FunctionEmissionStatus::Emitted)) | ||||
18387 | return FunctionEmissionStatus::Emitted; | ||||
18388 | } | ||||
18389 | |||||
18390 | // Otherwise, the function is known-emitted if it's in our set of | ||||
18391 | // known-emitted functions. | ||||
18392 | return FunctionEmissionStatus::Unknown; | ||||
18393 | } | ||||
18394 | |||||
18395 | bool Sema::shouldIgnoreInHostDeviceCheck(FunctionDecl *Callee) { | ||||
18396 | // Host-side references to a __global__ function refer to the stub, so the | ||||
18397 | // function itself is never emitted and therefore should not be marked. | ||||
18398 | // If we have host fn calls kernel fn calls host+device, the HD function | ||||
18399 | // does not get instantiated on the host. We model this by omitting at the | ||||
18400 | // call to the kernel from the callgraph. This ensures that, when compiling | ||||
18401 | // for host, only HD functions actually called from the host get marked as | ||||
18402 | // known-emitted. | ||||
18403 | return LangOpts.CUDA && !LangOpts.CUDAIsDevice && | ||||
18404 | IdentifyCUDATarget(Callee) == CFT_Global; | ||||
18405 | } |
1 | //===- DeclBase.h - Base Classes for representing declarations --*- 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 | // This file defines the Decl and DeclContext interfaces. |
10 | // |
11 | //===----------------------------------------------------------------------===// |
12 | |
13 | #ifndef LLVM_CLANG_AST_DECLBASE_H |
14 | #define LLVM_CLANG_AST_DECLBASE_H |
15 | |
16 | #include "clang/AST/ASTDumperUtils.h" |
17 | #include "clang/AST/AttrIterator.h" |
18 | #include "clang/AST/DeclarationName.h" |
19 | #include "clang/Basic/IdentifierTable.h" |
20 | #include "clang/Basic/LLVM.h" |
21 | #include "clang/Basic/SourceLocation.h" |
22 | #include "clang/Basic/Specifiers.h" |
23 | #include "llvm/ADT/ArrayRef.h" |
24 | #include "llvm/ADT/PointerIntPair.h" |
25 | #include "llvm/ADT/PointerUnion.h" |
26 | #include "llvm/ADT/iterator.h" |
27 | #include "llvm/ADT/iterator_range.h" |
28 | #include "llvm/Support/Casting.h" |
29 | #include "llvm/Support/Compiler.h" |
30 | #include "llvm/Support/PrettyStackTrace.h" |
31 | #include "llvm/Support/VersionTuple.h" |
32 | #include <algorithm> |
33 | #include <cassert> |
34 | #include <cstddef> |
35 | #include <iterator> |
36 | #include <string> |
37 | #include <type_traits> |
38 | #include <utility> |
39 | |
40 | namespace clang { |
41 | |
42 | class ASTContext; |
43 | class ASTMutationListener; |
44 | class Attr; |
45 | class BlockDecl; |
46 | class DeclContext; |
47 | class ExternalSourceSymbolAttr; |
48 | class FunctionDecl; |
49 | class FunctionType; |
50 | class IdentifierInfo; |
51 | enum Linkage : unsigned char; |
52 | class LinkageSpecDecl; |
53 | class Module; |
54 | class NamedDecl; |
55 | class ObjCCategoryDecl; |
56 | class ObjCCategoryImplDecl; |
57 | class ObjCContainerDecl; |
58 | class ObjCImplDecl; |
59 | class ObjCImplementationDecl; |
60 | class ObjCInterfaceDecl; |
61 | class ObjCMethodDecl; |
62 | class ObjCProtocolDecl; |
63 | struct PrintingPolicy; |
64 | class RecordDecl; |
65 | class SourceManager; |
66 | class Stmt; |
67 | class StoredDeclsMap; |
68 | class TemplateDecl; |
69 | class TemplateParameterList; |
70 | class TranslationUnitDecl; |
71 | class UsingDirectiveDecl; |
72 | |
73 | /// Captures the result of checking the availability of a |
74 | /// declaration. |
75 | enum AvailabilityResult { |
76 | AR_Available = 0, |
77 | AR_NotYetIntroduced, |
78 | AR_Deprecated, |
79 | AR_Unavailable |
80 | }; |
81 | |
82 | /// Decl - This represents one declaration (or definition), e.g. a variable, |
83 | /// typedef, function, struct, etc. |
84 | /// |
85 | /// Note: There are objects tacked on before the *beginning* of Decl |
86 | /// (and its subclasses) in its Decl::operator new(). Proper alignment |
87 | /// of all subclasses (not requiring more than the alignment of Decl) is |
88 | /// asserted in DeclBase.cpp. |
89 | class alignas(8) Decl { |
90 | public: |
91 | /// Lists the kind of concrete classes of Decl. |
92 | enum Kind { |
93 | #define DECL(DERIVED, BASE) DERIVED, |
94 | #define ABSTRACT_DECL(DECL) |
95 | #define DECL_RANGE(BASE, START, END) \ |
96 | first##BASE = START, last##BASE = END, |
97 | #define LAST_DECL_RANGE(BASE, START, END) \ |
98 | first##BASE = START, last##BASE = END |
99 | #include "clang/AST/DeclNodes.inc" |
100 | }; |
101 | |
102 | /// A placeholder type used to construct an empty shell of a |
103 | /// decl-derived type that will be filled in later (e.g., by some |
104 | /// deserialization method). |
105 | struct EmptyShell {}; |
106 | |
107 | /// IdentifierNamespace - The different namespaces in which |
108 | /// declarations may appear. According to C99 6.2.3, there are |
109 | /// four namespaces, labels, tags, members and ordinary |
110 | /// identifiers. C++ describes lookup completely differently: |
111 | /// certain lookups merely "ignore" certain kinds of declarations, |
112 | /// usually based on whether the declaration is of a type, etc. |
113 | /// |
114 | /// These are meant as bitmasks, so that searches in |
115 | /// C++ can look into the "tag" namespace during ordinary lookup. |
116 | /// |
117 | /// Decl currently provides 15 bits of IDNS bits. |
118 | enum IdentifierNamespace { |
119 | /// Labels, declared with 'x:' and referenced with 'goto x'. |
120 | IDNS_Label = 0x0001, |
121 | |
122 | /// Tags, declared with 'struct foo;' and referenced with |
123 | /// 'struct foo'. All tags are also types. This is what |
124 | /// elaborated-type-specifiers look for in C. |
125 | /// This also contains names that conflict with tags in the |
126 | /// same scope but that are otherwise ordinary names (non-type |
127 | /// template parameters and indirect field declarations). |
128 | IDNS_Tag = 0x0002, |
129 | |
130 | /// Types, declared with 'struct foo', typedefs, etc. |
131 | /// This is what elaborated-type-specifiers look for in C++, |
132 | /// but note that it's ill-formed to find a non-tag. |
133 | IDNS_Type = 0x0004, |
134 | |
135 | /// Members, declared with object declarations within tag |
136 | /// definitions. In C, these can only be found by "qualified" |
137 | /// lookup in member expressions. In C++, they're found by |
138 | /// normal lookup. |
139 | IDNS_Member = 0x0008, |
140 | |
141 | /// Namespaces, declared with 'namespace foo {}'. |
142 | /// Lookup for nested-name-specifiers find these. |
143 | IDNS_Namespace = 0x0010, |
144 | |
145 | /// Ordinary names. In C, everything that's not a label, tag, |
146 | /// member, or function-local extern ends up here. |
147 | IDNS_Ordinary = 0x0020, |
148 | |
149 | /// Objective C \@protocol. |
150 | IDNS_ObjCProtocol = 0x0040, |
151 | |
152 | /// This declaration is a friend function. A friend function |
153 | /// declaration is always in this namespace but may also be in |
154 | /// IDNS_Ordinary if it was previously declared. |
155 | IDNS_OrdinaryFriend = 0x0080, |
156 | |
157 | /// This declaration is a friend class. A friend class |
158 | /// declaration is always in this namespace but may also be in |
159 | /// IDNS_Tag|IDNS_Type if it was previously declared. |
160 | IDNS_TagFriend = 0x0100, |
161 | |
162 | /// This declaration is a using declaration. A using declaration |
163 | /// *introduces* a number of other declarations into the current |
164 | /// scope, and those declarations use the IDNS of their targets, |
165 | /// but the actual using declarations go in this namespace. |
166 | IDNS_Using = 0x0200, |
167 | |
168 | /// This declaration is a C++ operator declared in a non-class |
169 | /// context. All such operators are also in IDNS_Ordinary. |
170 | /// C++ lexical operator lookup looks for these. |
171 | IDNS_NonMemberOperator = 0x0400, |
172 | |
173 | /// This declaration is a function-local extern declaration of a |
174 | /// variable or function. This may also be IDNS_Ordinary if it |
175 | /// has been declared outside any function. These act mostly like |
176 | /// invisible friend declarations, but are also visible to unqualified |
177 | /// lookup within the scope of the declaring function. |
178 | IDNS_LocalExtern = 0x0800, |
179 | |
180 | /// This declaration is an OpenMP user defined reduction construction. |
181 | IDNS_OMPReduction = 0x1000, |
182 | |
183 | /// This declaration is an OpenMP user defined mapper. |
184 | IDNS_OMPMapper = 0x2000, |
185 | }; |
186 | |
187 | /// ObjCDeclQualifier - 'Qualifiers' written next to the return and |
188 | /// parameter types in method declarations. Other than remembering |
189 | /// them and mangling them into the method's signature string, these |
190 | /// are ignored by the compiler; they are consumed by certain |
191 | /// remote-messaging frameworks. |
192 | /// |
193 | /// in, inout, and out are mutually exclusive and apply only to |
194 | /// method parameters. bycopy and byref are mutually exclusive and |
195 | /// apply only to method parameters (?). oneway applies only to |
196 | /// results. All of these expect their corresponding parameter to |
197 | /// have a particular type. None of this is currently enforced by |
198 | /// clang. |
199 | /// |
200 | /// This should be kept in sync with ObjCDeclSpec::ObjCDeclQualifier. |
201 | enum ObjCDeclQualifier { |
202 | OBJC_TQ_None = 0x0, |
203 | OBJC_TQ_In = 0x1, |
204 | OBJC_TQ_Inout = 0x2, |
205 | OBJC_TQ_Out = 0x4, |
206 | OBJC_TQ_Bycopy = 0x8, |
207 | OBJC_TQ_Byref = 0x10, |
208 | OBJC_TQ_Oneway = 0x20, |
209 | |
210 | /// The nullability qualifier is set when the nullability of the |
211 | /// result or parameter was expressed via a context-sensitive |
212 | /// keyword. |
213 | OBJC_TQ_CSNullability = 0x40 |
214 | }; |
215 | |
216 | /// The kind of ownership a declaration has, for visibility purposes. |
217 | /// This enumeration is designed such that higher values represent higher |
218 | /// levels of name hiding. |
219 | enum class ModuleOwnershipKind : unsigned { |
220 | /// This declaration is not owned by a module. |
221 | Unowned, |
222 | |
223 | /// This declaration has an owning module, but is globally visible |
224 | /// (typically because its owning module is visible and we know that |
225 | /// modules cannot later become hidden in this compilation). |
226 | /// After serialization and deserialization, this will be converted |
227 | /// to VisibleWhenImported. |
228 | Visible, |
229 | |
230 | /// This declaration has an owning module, and is visible when that |
231 | /// module is imported. |
232 | VisibleWhenImported, |
233 | |
234 | /// This declaration has an owning module, but is only visible to |
235 | /// lookups that occur within that module. |
236 | ModulePrivate |
237 | }; |
238 | |
239 | protected: |
240 | /// The next declaration within the same lexical |
241 | /// DeclContext. These pointers form the linked list that is |
242 | /// traversed via DeclContext's decls_begin()/decls_end(). |
243 | /// |
244 | /// The extra two bits are used for the ModuleOwnershipKind. |
245 | llvm::PointerIntPair<Decl *, 2, ModuleOwnershipKind> NextInContextAndBits; |
246 | |
247 | private: |
248 | friend class DeclContext; |
249 | |
250 | struct MultipleDC { |
251 | DeclContext *SemanticDC; |
252 | DeclContext *LexicalDC; |
253 | }; |
254 | |
255 | /// DeclCtx - Holds either a DeclContext* or a MultipleDC*. |
256 | /// For declarations that don't contain C++ scope specifiers, it contains |
257 | /// the DeclContext where the Decl was declared. |
258 | /// For declarations with C++ scope specifiers, it contains a MultipleDC* |
259 | /// with the context where it semantically belongs (SemanticDC) and the |
260 | /// context where it was lexically declared (LexicalDC). |
261 | /// e.g.: |
262 | /// |
263 | /// namespace A { |
264 | /// void f(); // SemanticDC == LexicalDC == 'namespace A' |
265 | /// } |
266 | /// void A::f(); // SemanticDC == namespace 'A' |
267 | /// // LexicalDC == global namespace |
268 | llvm::PointerUnion<DeclContext*, MultipleDC*> DeclCtx; |
269 | |
270 | bool isInSemaDC() const { return DeclCtx.is<DeclContext*>(); } |
271 | bool isOutOfSemaDC() const { return DeclCtx.is<MultipleDC*>(); } |
272 | |
273 | MultipleDC *getMultipleDC() const { |
274 | return DeclCtx.get<MultipleDC*>(); |
275 | } |
276 | |
277 | DeclContext *getSemanticDC() const { |
278 | return DeclCtx.get<DeclContext*>(); |
279 | } |
280 | |
281 | /// Loc - The location of this decl. |
282 | SourceLocation Loc; |
283 | |
284 | /// DeclKind - This indicates which class this is. |
285 | unsigned DeclKind : 7; |
286 | |
287 | /// InvalidDecl - This indicates a semantic error occurred. |
288 | unsigned InvalidDecl : 1; |
289 | |
290 | /// HasAttrs - This indicates whether the decl has attributes or not. |
291 | unsigned HasAttrs : 1; |
292 | |
293 | /// Implicit - Whether this declaration was implicitly generated by |
294 | /// the implementation rather than explicitly written by the user. |
295 | unsigned Implicit : 1; |
296 | |
297 | /// Whether this declaration was "used", meaning that a definition is |
298 | /// required. |
299 | unsigned Used : 1; |
300 | |
301 | /// Whether this declaration was "referenced". |
302 | /// The difference with 'Used' is whether the reference appears in a |
303 | /// evaluated context or not, e.g. functions used in uninstantiated templates |
304 | /// are regarded as "referenced" but not "used". |
305 | unsigned Referenced : 1; |
306 | |
307 | /// Whether this declaration is a top-level declaration (function, |
308 | /// global variable, etc.) that is lexically inside an objc container |
309 | /// definition. |
310 | unsigned TopLevelDeclInObjCContainer : 1; |
311 | |
312 | /// Whether statistic collection is enabled. |
313 | static bool StatisticsEnabled; |
314 | |
315 | protected: |
316 | friend class ASTDeclReader; |
317 | friend class ASTDeclWriter; |
318 | friend class ASTNodeImporter; |
319 | friend class ASTReader; |
320 | friend class CXXClassMemberWrapper; |
321 | friend class LinkageComputer; |
322 | template<typename decl_type> friend class Redeclarable; |
323 | |
324 | /// Access - Used by C++ decls for the access specifier. |
325 | // NOTE: VC++ treats enums as signed, avoid using the AccessSpecifier enum |
326 | unsigned Access : 2; |
327 | |
328 | /// Whether this declaration was loaded from an AST file. |
329 | unsigned FromASTFile : 1; |
330 | |
331 | /// IdentifierNamespace - This specifies what IDNS_* namespace this lives in. |
332 | unsigned IdentifierNamespace : 14; |
333 | |
334 | /// If 0, we have not computed the linkage of this declaration. |
335 | /// Otherwise, it is the linkage + 1. |
336 | mutable unsigned CacheValidAndLinkage : 3; |
337 | |
338 | /// Allocate memory for a deserialized declaration. |
339 | /// |
340 | /// This routine must be used to allocate memory for any declaration that is |
341 | /// deserialized from a module file. |
342 | /// |
343 | /// \param Size The size of the allocated object. |
344 | /// \param Ctx The context in which we will allocate memory. |
345 | /// \param ID The global ID of the deserialized declaration. |
346 | /// \param Extra The amount of extra space to allocate after the object. |
347 | void *operator new(std::size_t Size, const ASTContext &Ctx, unsigned ID, |
348 | std::size_t Extra = 0); |
349 | |
350 | /// Allocate memory for a non-deserialized declaration. |
351 | void *operator new(std::size_t Size, const ASTContext &Ctx, |
352 | DeclContext *Parent, std::size_t Extra = 0); |
353 | |
354 | private: |
355 | bool AccessDeclContextSanity() const; |
356 | |
357 | /// Get the module ownership kind to use for a local lexical child of \p DC, |
358 | /// which may be either a local or (rarely) an imported declaration. |
359 | static ModuleOwnershipKind getModuleOwnershipKindForChildOf(DeclContext *DC) { |
360 | if (DC) { |
361 | auto *D = cast<Decl>(DC); |
362 | auto MOK = D->getModuleOwnershipKind(); |
363 | if (MOK != ModuleOwnershipKind::Unowned && |
364 | (!D->isFromASTFile() || D->hasLocalOwningModuleStorage())) |
365 | return MOK; |
366 | // If D is not local and we have no local module storage, then we don't |
367 | // need to track module ownership at all. |
368 | } |
369 | return ModuleOwnershipKind::Unowned; |
370 | } |
371 | |
372 | public: |
373 | Decl() = delete; |
374 | Decl(const Decl&) = delete; |
375 | Decl(Decl &&) = delete; |
376 | Decl &operator=(const Decl&) = delete; |
377 | Decl &operator=(Decl&&) = delete; |
378 | |
379 | protected: |
380 | Decl(Kind DK, DeclContext *DC, SourceLocation L) |
381 | : NextInContextAndBits(nullptr, getModuleOwnershipKindForChildOf(DC)), |
382 | DeclCtx(DC), Loc(L), DeclKind(DK), InvalidDecl(false), HasAttrs(false), |
383 | Implicit(false), Used(false), Referenced(false), |
384 | TopLevelDeclInObjCContainer(false), Access(AS_none), FromASTFile(0), |
385 | IdentifierNamespace(getIdentifierNamespaceForKind(DK)), |
386 | CacheValidAndLinkage(0) { |
387 | if (StatisticsEnabled) add(DK); |
388 | } |
389 | |
390 | Decl(Kind DK, EmptyShell Empty) |
391 | : DeclKind(DK), InvalidDecl(false), HasAttrs(false), Implicit(false), |
392 | Used(false), Referenced(false), TopLevelDeclInObjCContainer(false), |
393 | Access(AS_none), FromASTFile(0), |
394 | IdentifierNamespace(getIdentifierNamespaceForKind(DK)), |
395 | CacheValidAndLinkage(0) { |
396 | if (StatisticsEnabled) add(DK); |
397 | } |
398 | |
399 | virtual ~Decl(); |
400 | |
401 | /// Update a potentially out-of-date declaration. |
402 | void updateOutOfDate(IdentifierInfo &II) const; |
403 | |
404 | Linkage getCachedLinkage() const { |
405 | return Linkage(CacheValidAndLinkage - 1); |
406 | } |
407 | |
408 | void setCachedLinkage(Linkage L) const { |
409 | CacheValidAndLinkage = L + 1; |
410 | } |
411 | |
412 | bool hasCachedLinkage() const { |
413 | return CacheValidAndLinkage; |
414 | } |
415 | |
416 | public: |
417 | /// Source range that this declaration covers. |
418 | virtual SourceRange getSourceRange() const LLVM_READONLY__attribute__((__pure__)) { |
419 | return SourceRange(getLocation(), getLocation()); |
420 | } |
421 | |
422 | SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { |
423 | return getSourceRange().getBegin(); |
424 | } |
425 | |
426 | SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { |
427 | return getSourceRange().getEnd(); |
428 | } |
429 | |
430 | SourceLocation getLocation() const { return Loc; } |
431 | void setLocation(SourceLocation L) { Loc = L; } |
432 | |
433 | Kind getKind() const { return static_cast<Kind>(DeclKind); } |
434 | const char *getDeclKindName() const; |
435 | |
436 | Decl *getNextDeclInContext() { return NextInContextAndBits.getPointer(); } |
437 | const Decl *getNextDeclInContext() const {return NextInContextAndBits.getPointer();} |
438 | |
439 | DeclContext *getDeclContext() { |
440 | if (isInSemaDC()) |
441 | return getSemanticDC(); |
442 | return getMultipleDC()->SemanticDC; |
443 | } |
444 | const DeclContext *getDeclContext() const { |
445 | return const_cast<Decl*>(this)->getDeclContext(); |
446 | } |
447 | |
448 | /// Find the innermost non-closure ancestor of this declaration, |
449 | /// walking up through blocks, lambdas, etc. If that ancestor is |
450 | /// not a code context (!isFunctionOrMethod()), returns null. |
451 | /// |
452 | /// A declaration may be its own non-closure context. |
453 | Decl *getNonClosureContext(); |
454 | const Decl *getNonClosureContext() const { |
455 | return const_cast<Decl*>(this)->getNonClosureContext(); |
456 | } |
457 | |
458 | TranslationUnitDecl *getTranslationUnitDecl(); |
459 | const TranslationUnitDecl *getTranslationUnitDecl() const { |
460 | return const_cast<Decl*>(this)->getTranslationUnitDecl(); |
461 | } |
462 | |
463 | bool isInAnonymousNamespace() const; |
464 | |
465 | bool isInStdNamespace() const; |
466 | |
467 | ASTContext &getASTContext() const LLVM_READONLY__attribute__((__pure__)); |
468 | |
469 | /// Helper to get the language options from the ASTContext. |
470 | /// Defined out of line to avoid depending on ASTContext.h. |
471 | const LangOptions &getLangOpts() const LLVM_READONLY__attribute__((__pure__)); |
472 | |
473 | void setAccess(AccessSpecifier AS) { |
474 | Access = AS; |
475 | assert(AccessDeclContextSanity())((AccessDeclContextSanity()) ? static_cast<void> (0) : __assert_fail ("AccessDeclContextSanity()", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 475, __PRETTY_FUNCTION__)); |
476 | } |
477 | |
478 | AccessSpecifier getAccess() const { |
479 | assert(AccessDeclContextSanity())((AccessDeclContextSanity()) ? static_cast<void> (0) : __assert_fail ("AccessDeclContextSanity()", "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 479, __PRETTY_FUNCTION__)); |
480 | return AccessSpecifier(Access); |
481 | } |
482 | |
483 | /// Retrieve the access specifier for this declaration, even though |
484 | /// it may not yet have been properly set. |
485 | AccessSpecifier getAccessUnsafe() const { |
486 | return AccessSpecifier(Access); |
487 | } |
488 | |
489 | bool hasAttrs() const { return HasAttrs; } |
490 | |
491 | void setAttrs(const AttrVec& Attrs) { |
492 | return setAttrsImpl(Attrs, getASTContext()); |
493 | } |
494 | |
495 | AttrVec &getAttrs() { |
496 | return const_cast<AttrVec&>(const_cast<const Decl*>(this)->getAttrs()); |
497 | } |
498 | |
499 | const AttrVec &getAttrs() const; |
500 | void dropAttrs(); |
501 | void addAttr(Attr *A); |
502 | |
503 | using attr_iterator = AttrVec::const_iterator; |
504 | using attr_range = llvm::iterator_range<attr_iterator>; |
505 | |
506 | attr_range attrs() const { |
507 | return attr_range(attr_begin(), attr_end()); |
508 | } |
509 | |
510 | attr_iterator attr_begin() const { |
511 | return hasAttrs() ? getAttrs().begin() : nullptr; |
512 | } |
513 | attr_iterator attr_end() const { |
514 | return hasAttrs() ? getAttrs().end() : nullptr; |
515 | } |
516 | |
517 | template <typename T> |
518 | void dropAttr() { |
519 | if (!HasAttrs) return; |
520 | |
521 | AttrVec &Vec = getAttrs(); |
522 | llvm::erase_if(Vec, [](Attr *A) { return isa<T>(A); }); |
523 | |
524 | if (Vec.empty()) |
525 | HasAttrs = false; |
526 | } |
527 | |
528 | template <typename T> |
529 | llvm::iterator_range<specific_attr_iterator<T>> specific_attrs() const { |
530 | return llvm::make_range(specific_attr_begin<T>(), specific_attr_end<T>()); |
531 | } |
532 | |
533 | template <typename T> |
534 | specific_attr_iterator<T> specific_attr_begin() const { |
535 | return specific_attr_iterator<T>(attr_begin()); |
536 | } |
537 | |
538 | template <typename T> |
539 | specific_attr_iterator<T> specific_attr_end() const { |
540 | return specific_attr_iterator<T>(attr_end()); |
541 | } |
542 | |
543 | template<typename T> T *getAttr() const { |
544 | return hasAttrs() ? getSpecificAttr<T>(getAttrs()) : nullptr; |
545 | } |
546 | |
547 | template<typename T> bool hasAttr() const { |
548 | return hasAttrs() && hasSpecificAttr<T>(getAttrs()); |
549 | } |
550 | |
551 | /// getMaxAlignment - return the maximum alignment specified by attributes |
552 | /// on this decl, 0 if there are none. |
553 | unsigned getMaxAlignment() const; |
554 | |
555 | /// setInvalidDecl - Indicates the Decl had a semantic error. This |
556 | /// allows for graceful error recovery. |
557 | void setInvalidDecl(bool Invalid = true); |
558 | bool isInvalidDecl() const { return (bool) InvalidDecl; } |
559 | |
560 | /// isImplicit - Indicates whether the declaration was implicitly |
561 | /// generated by the implementation. If false, this declaration |
562 | /// was written explicitly in the source code. |
563 | bool isImplicit() const { return Implicit; } |
564 | void setImplicit(bool I = true) { Implicit = I; } |
565 | |
566 | /// Whether *any* (re-)declaration of the entity was used, meaning that |
567 | /// a definition is required. |
568 | /// |
569 | /// \param CheckUsedAttr When true, also consider the "used" attribute |
570 | /// (in addition to the "used" bit set by \c setUsed()) when determining |
571 | /// whether the function is used. |
572 | bool isUsed(bool CheckUsedAttr = true) const; |
573 | |
574 | /// Set whether the declaration is used, in the sense of odr-use. |
575 | /// |
576 | /// This should only be used immediately after creating a declaration. |
577 | /// It intentionally doesn't notify any listeners. |
578 | void setIsUsed() { getCanonicalDecl()->Used = true; } |
579 | |
580 | /// Mark the declaration used, in the sense of odr-use. |
581 | /// |
582 | /// This notifies any mutation listeners in addition to setting a bit |
583 | /// indicating the declaration is used. |
584 | void markUsed(ASTContext &C); |
585 | |
586 | /// Whether any declaration of this entity was referenced. |
587 | bool isReferenced() const; |
588 | |
589 | /// Whether this declaration was referenced. This should not be relied |
590 | /// upon for anything other than debugging. |
591 | bool isThisDeclarationReferenced() const { return Referenced; } |
592 | |
593 | void setReferenced(bool R = true) { Referenced = R; } |
594 | |
595 | /// Whether this declaration is a top-level declaration (function, |
596 | /// global variable, etc.) that is lexically inside an objc container |
597 | /// definition. |
598 | bool isTopLevelDeclInObjCContainer() const { |
599 | return TopLevelDeclInObjCContainer; |
600 | } |
601 | |
602 | void setTopLevelDeclInObjCContainer(bool V = true) { |
603 | TopLevelDeclInObjCContainer = V; |
604 | } |
605 | |
606 | /// Looks on this and related declarations for an applicable |
607 | /// external source symbol attribute. |
608 | ExternalSourceSymbolAttr *getExternalSourceSymbolAttr() const; |
609 | |
610 | /// Whether this declaration was marked as being private to the |
611 | /// module in which it was defined. |
612 | bool isModulePrivate() const { |
613 | return getModuleOwnershipKind() == ModuleOwnershipKind::ModulePrivate; |
614 | } |
615 | |
616 | /// Return true if this declaration has an attribute which acts as |
617 | /// definition of the entity, such as 'alias' or 'ifunc'. |
618 | bool hasDefiningAttr() const; |
619 | |
620 | /// Return this declaration's defining attribute if it has one. |
621 | const Attr *getDefiningAttr() const; |
622 | |
623 | protected: |
624 | /// Specify that this declaration was marked as being private |
625 | /// to the module in which it was defined. |
626 | void setModulePrivate() { |
627 | // The module-private specifier has no effect on unowned declarations. |
628 | // FIXME: We should track this in some way for source fidelity. |
629 | if (getModuleOwnershipKind() == ModuleOwnershipKind::Unowned) |
630 | return; |
631 | setModuleOwnershipKind(ModuleOwnershipKind::ModulePrivate); |
632 | } |
633 | |
634 | public: |
635 | /// Set the FromASTFile flag. This indicates that this declaration |
636 | /// was deserialized and not parsed from source code and enables |
637 | /// features such as module ownership information. |
638 | void setFromASTFile() { |
639 | FromASTFile = true; |
640 | } |
641 | |
642 | /// Set the owning module ID. This may only be called for |
643 | /// deserialized Decls. |
644 | void setOwningModuleID(unsigned ID) { |
645 | assert(isFromASTFile() && "Only works on a deserialized declaration")((isFromASTFile() && "Only works on a deserialized declaration" ) ? static_cast<void> (0) : __assert_fail ("isFromASTFile() && \"Only works on a deserialized declaration\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 645, __PRETTY_FUNCTION__)); |
646 | *((unsigned*)this - 2) = ID; |
647 | } |
648 | |
649 | public: |
650 | /// Determine the availability of the given declaration. |
651 | /// |
652 | /// This routine will determine the most restrictive availability of |
653 | /// the given declaration (e.g., preferring 'unavailable' to |
654 | /// 'deprecated'). |
655 | /// |
656 | /// \param Message If non-NULL and the result is not \c |
657 | /// AR_Available, will be set to a (possibly empty) message |
658 | /// describing why the declaration has not been introduced, is |
659 | /// deprecated, or is unavailable. |
660 | /// |
661 | /// \param EnclosingVersion The version to compare with. If empty, assume the |
662 | /// deployment target version. |
663 | /// |
664 | /// \param RealizedPlatform If non-NULL and the availability result is found |
665 | /// in an available attribute it will set to the platform which is written in |
666 | /// the available attribute. |
667 | AvailabilityResult |
668 | getAvailability(std::string *Message = nullptr, |
669 | VersionTuple EnclosingVersion = VersionTuple(), |
670 | StringRef *RealizedPlatform = nullptr) const; |
671 | |
672 | /// Retrieve the version of the target platform in which this |
673 | /// declaration was introduced. |
674 | /// |
675 | /// \returns An empty version tuple if this declaration has no 'introduced' |
676 | /// availability attributes, or the version tuple that's specified in the |
677 | /// attribute otherwise. |
678 | VersionTuple getVersionIntroduced() const; |
679 | |
680 | /// Determine whether this declaration is marked 'deprecated'. |
681 | /// |
682 | /// \param Message If non-NULL and the declaration is deprecated, |
683 | /// this will be set to the message describing why the declaration |
684 | /// was deprecated (which may be empty). |
685 | bool isDeprecated(std::string *Message = nullptr) const { |
686 | return getAvailability(Message) == AR_Deprecated; |
687 | } |
688 | |
689 | /// Determine whether this declaration is marked 'unavailable'. |
690 | /// |
691 | /// \param Message If non-NULL and the declaration is unavailable, |
692 | /// this will be set to the message describing why the declaration |
693 | /// was made unavailable (which may be empty). |
694 | bool isUnavailable(std::string *Message = nullptr) const { |
695 | return getAvailability(Message) == AR_Unavailable; |
696 | } |
697 | |
698 | /// Determine whether this is a weak-imported symbol. |
699 | /// |
700 | /// Weak-imported symbols are typically marked with the |
701 | /// 'weak_import' attribute, but may also be marked with an |
702 | /// 'availability' attribute where we're targing a platform prior to |
703 | /// the introduction of this feature. |
704 | bool isWeakImported() const; |
705 | |
706 | /// Determines whether this symbol can be weak-imported, |
707 | /// e.g., whether it would be well-formed to add the weak_import |
708 | /// attribute. |
709 | /// |
710 | /// \param IsDefinition Set to \c true to indicate that this |
711 | /// declaration cannot be weak-imported because it has a definition. |
712 | bool canBeWeakImported(bool &IsDefinition) const; |
713 | |
714 | /// Determine whether this declaration came from an AST file (such as |
715 | /// a precompiled header or module) rather than having been parsed. |
716 | bool isFromASTFile() const { return FromASTFile; } |
717 | |
718 | /// Retrieve the global declaration ID associated with this |
719 | /// declaration, which specifies where this Decl was loaded from. |
720 | unsigned getGlobalID() const { |
721 | if (isFromASTFile()) |
722 | return *((const unsigned*)this - 1); |
723 | return 0; |
724 | } |
725 | |
726 | /// Retrieve the global ID of the module that owns this particular |
727 | /// declaration. |
728 | unsigned getOwningModuleID() const { |
729 | if (isFromASTFile()) |
730 | return *((const unsigned*)this - 2); |
731 | return 0; |
732 | } |
733 | |
734 | private: |
735 | Module *getOwningModuleSlow() const; |
736 | |
737 | protected: |
738 | bool hasLocalOwningModuleStorage() const; |
739 | |
740 | public: |
741 | /// Get the imported owning module, if this decl is from an imported |
742 | /// (non-local) module. |
743 | Module *getImportedOwningModule() const { |
744 | if (!isFromASTFile() || !hasOwningModule()) |
745 | return nullptr; |
746 | |
747 | return getOwningModuleSlow(); |
748 | } |
749 | |
750 | /// Get the local owning module, if known. Returns nullptr if owner is |
751 | /// not yet known or declaration is not from a module. |
752 | Module *getLocalOwningModule() const { |
753 | if (isFromASTFile() || !hasOwningModule()) |
754 | return nullptr; |
755 | |
756 | assert(hasLocalOwningModuleStorage() &&((hasLocalOwningModuleStorage() && "owned local decl but no local module storage" ) ? static_cast<void> (0) : __assert_fail ("hasLocalOwningModuleStorage() && \"owned local decl but no local module storage\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 757, __PRETTY_FUNCTION__)) |
757 | "owned local decl but no local module storage")((hasLocalOwningModuleStorage() && "owned local decl but no local module storage" ) ? static_cast<void> (0) : __assert_fail ("hasLocalOwningModuleStorage() && \"owned local decl but no local module storage\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 757, __PRETTY_FUNCTION__)); |
758 | return reinterpret_cast<Module *const *>(this)[-1]; |
759 | } |
760 | void setLocalOwningModule(Module *M) { |
761 | assert(!isFromASTFile() && hasOwningModule() &&((!isFromASTFile() && hasOwningModule() && hasLocalOwningModuleStorage () && "should not have a cached owning module") ? static_cast <void> (0) : __assert_fail ("!isFromASTFile() && hasOwningModule() && hasLocalOwningModuleStorage() && \"should not have a cached owning module\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 763, __PRETTY_FUNCTION__)) |
762 | hasLocalOwningModuleStorage() &&((!isFromASTFile() && hasOwningModule() && hasLocalOwningModuleStorage () && "should not have a cached owning module") ? static_cast <void> (0) : __assert_fail ("!isFromASTFile() && hasOwningModule() && hasLocalOwningModuleStorage() && \"should not have a cached owning module\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 763, __PRETTY_FUNCTION__)) |
763 | "should not have a cached owning module")((!isFromASTFile() && hasOwningModule() && hasLocalOwningModuleStorage () && "should not have a cached owning module") ? static_cast <void> (0) : __assert_fail ("!isFromASTFile() && hasOwningModule() && hasLocalOwningModuleStorage() && \"should not have a cached owning module\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 763, __PRETTY_FUNCTION__)); |
764 | reinterpret_cast<Module **>(this)[-1] = M; |
765 | } |
766 | |
767 | /// Is this declaration owned by some module? |
768 | bool hasOwningModule() const { |
769 | return getModuleOwnershipKind() != ModuleOwnershipKind::Unowned; |
770 | } |
771 | |
772 | /// Get the module that owns this declaration (for visibility purposes). |
773 | Module *getOwningModule() const { |
774 | return isFromASTFile() ? getImportedOwningModule() : getLocalOwningModule(); |
775 | } |
776 | |
777 | /// Get the module that owns this declaration for linkage purposes. |
778 | /// There only ever is such a module under the C++ Modules TS. |
779 | /// |
780 | /// \param IgnoreLinkage Ignore the linkage of the entity; assume that |
781 | /// all declarations in a global module fragment are unowned. |
782 | Module *getOwningModuleForLinkage(bool IgnoreLinkage = false) const; |
783 | |
784 | /// Determine whether this declaration is definitely visible to name lookup, |
785 | /// independent of whether the owning module is visible. |
786 | /// Note: The declaration may be visible even if this returns \c false if the |
787 | /// owning module is visible within the query context. This is a low-level |
788 | /// helper function; most code should be calling Sema::isVisible() instead. |
789 | bool isUnconditionallyVisible() const { |
790 | return (int)getModuleOwnershipKind() <= (int)ModuleOwnershipKind::Visible; |
791 | } |
792 | |
793 | /// Set that this declaration is globally visible, even if it came from a |
794 | /// module that is not visible. |
795 | void setVisibleDespiteOwningModule() { |
796 | if (!isUnconditionallyVisible()) |
797 | setModuleOwnershipKind(ModuleOwnershipKind::Visible); |
798 | } |
799 | |
800 | /// Get the kind of module ownership for this declaration. |
801 | ModuleOwnershipKind getModuleOwnershipKind() const { |
802 | return NextInContextAndBits.getInt(); |
803 | } |
804 | |
805 | /// Set whether this declaration is hidden from name lookup. |
806 | void setModuleOwnershipKind(ModuleOwnershipKind MOK) { |
807 | assert(!(getModuleOwnershipKind() == ModuleOwnershipKind::Unowned &&((!(getModuleOwnershipKind() == ModuleOwnershipKind::Unowned && MOK != ModuleOwnershipKind::Unowned && !isFromASTFile () && !hasLocalOwningModuleStorage()) && "no storage available for owning module for this declaration" ) ? static_cast<void> (0) : __assert_fail ("!(getModuleOwnershipKind() == ModuleOwnershipKind::Unowned && MOK != ModuleOwnershipKind::Unowned && !isFromASTFile() && !hasLocalOwningModuleStorage()) && \"no storage available for owning module for this declaration\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 810, __PRETTY_FUNCTION__)) |
808 | MOK != ModuleOwnershipKind::Unowned && !isFromASTFile() &&((!(getModuleOwnershipKind() == ModuleOwnershipKind::Unowned && MOK != ModuleOwnershipKind::Unowned && !isFromASTFile () && !hasLocalOwningModuleStorage()) && "no storage available for owning module for this declaration" ) ? static_cast<void> (0) : __assert_fail ("!(getModuleOwnershipKind() == ModuleOwnershipKind::Unowned && MOK != ModuleOwnershipKind::Unowned && !isFromASTFile() && !hasLocalOwningModuleStorage()) && \"no storage available for owning module for this declaration\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 810, __PRETTY_FUNCTION__)) |
809 | !hasLocalOwningModuleStorage()) &&((!(getModuleOwnershipKind() == ModuleOwnershipKind::Unowned && MOK != ModuleOwnershipKind::Unowned && !isFromASTFile () && !hasLocalOwningModuleStorage()) && "no storage available for owning module for this declaration" ) ? static_cast<void> (0) : __assert_fail ("!(getModuleOwnershipKind() == ModuleOwnershipKind::Unowned && MOK != ModuleOwnershipKind::Unowned && !isFromASTFile() && !hasLocalOwningModuleStorage()) && \"no storage available for owning module for this declaration\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 810, __PRETTY_FUNCTION__)) |
810 | "no storage available for owning module for this declaration")((!(getModuleOwnershipKind() == ModuleOwnershipKind::Unowned && MOK != ModuleOwnershipKind::Unowned && !isFromASTFile () && !hasLocalOwningModuleStorage()) && "no storage available for owning module for this declaration" ) ? static_cast<void> (0) : __assert_fail ("!(getModuleOwnershipKind() == ModuleOwnershipKind::Unowned && MOK != ModuleOwnershipKind::Unowned && !isFromASTFile() && !hasLocalOwningModuleStorage()) && \"no storage available for owning module for this declaration\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 810, __PRETTY_FUNCTION__)); |
811 | NextInContextAndBits.setInt(MOK); |
812 | } |
813 | |
814 | unsigned getIdentifierNamespace() const { |
815 | return IdentifierNamespace; |
816 | } |
817 | |
818 | bool isInIdentifierNamespace(unsigned NS) const { |
819 | return getIdentifierNamespace() & NS; |
820 | } |
821 | |
822 | static unsigned getIdentifierNamespaceForKind(Kind DK); |
823 | |
824 | bool hasTagIdentifierNamespace() const { |
825 | return isTagIdentifierNamespace(getIdentifierNamespace()); |
826 | } |
827 | |
828 | static bool isTagIdentifierNamespace(unsigned NS) { |
829 | // TagDecls have Tag and Type set and may also have TagFriend. |
830 | return (NS & ~IDNS_TagFriend) == (IDNS_Tag | IDNS_Type); |
831 | } |
832 | |
833 | /// getLexicalDeclContext - The declaration context where this Decl was |
834 | /// lexically declared (LexicalDC). May be different from |
835 | /// getDeclContext() (SemanticDC). |
836 | /// e.g.: |
837 | /// |
838 | /// namespace A { |
839 | /// void f(); // SemanticDC == LexicalDC == 'namespace A' |
840 | /// } |
841 | /// void A::f(); // SemanticDC == namespace 'A' |
842 | /// // LexicalDC == global namespace |
843 | DeclContext *getLexicalDeclContext() { |
844 | if (isInSemaDC()) |
845 | return getSemanticDC(); |
846 | return getMultipleDC()->LexicalDC; |
847 | } |
848 | const DeclContext *getLexicalDeclContext() const { |
849 | return const_cast<Decl*>(this)->getLexicalDeclContext(); |
850 | } |
851 | |
852 | /// Determine whether this declaration is declared out of line (outside its |
853 | /// semantic context). |
854 | virtual bool isOutOfLine() const; |
855 | |
856 | /// setDeclContext - Set both the semantic and lexical DeclContext |
857 | /// to DC. |
858 | void setDeclContext(DeclContext *DC); |
859 | |
860 | void setLexicalDeclContext(DeclContext *DC); |
861 | |
862 | /// Determine whether this declaration is a templated entity (whether it is |
863 | // within the scope of a template parameter). |
864 | bool isTemplated() const; |
865 | |
866 | /// Determine the number of levels of template parameter surrounding this |
867 | /// declaration. |
868 | unsigned getTemplateDepth() const; |
869 | |
870 | /// isDefinedOutsideFunctionOrMethod - This predicate returns true if this |
871 | /// scoped decl is defined outside the current function or method. This is |
872 | /// roughly global variables and functions, but also handles enums (which |
873 | /// could be defined inside or outside a function etc). |
874 | bool isDefinedOutsideFunctionOrMethod() const { |
875 | return getParentFunctionOrMethod() == nullptr; |
876 | } |
877 | |
878 | /// Determine whether a substitution into this declaration would occur as |
879 | /// part of a substitution into a dependent local scope. Such a substitution |
880 | /// transitively substitutes into all constructs nested within this |
881 | /// declaration. |
882 | /// |
883 | /// This recognizes non-defining declarations as well as members of local |
884 | /// classes and lambdas: |
885 | /// \code |
886 | /// template<typename T> void foo() { void bar(); } |
887 | /// template<typename T> void foo2() { class ABC { void bar(); }; } |
888 | /// template<typename T> inline int x = [](){ return 0; }(); |
889 | /// \endcode |
890 | bool isInLocalScopeForInstantiation() const; |
891 | |
892 | /// If this decl is defined inside a function/method/block it returns |
893 | /// the corresponding DeclContext, otherwise it returns null. |
894 | const DeclContext *getParentFunctionOrMethod() const; |
895 | DeclContext *getParentFunctionOrMethod() { |
896 | return const_cast<DeclContext*>( |
897 | const_cast<const Decl*>(this)->getParentFunctionOrMethod()); |
898 | } |
899 | |
900 | /// Retrieves the "canonical" declaration of the given declaration. |
901 | virtual Decl *getCanonicalDecl() { return this; } |
902 | const Decl *getCanonicalDecl() const { |
903 | return const_cast<Decl*>(this)->getCanonicalDecl(); |
904 | } |
905 | |
906 | /// Whether this particular Decl is a canonical one. |
907 | bool isCanonicalDecl() const { return getCanonicalDecl() == this; } |
908 | |
909 | protected: |
910 | /// Returns the next redeclaration or itself if this is the only decl. |
911 | /// |
912 | /// Decl subclasses that can be redeclared should override this method so that |
913 | /// Decl::redecl_iterator can iterate over them. |
914 | virtual Decl *getNextRedeclarationImpl() { return this; } |
915 | |
916 | /// Implementation of getPreviousDecl(), to be overridden by any |
917 | /// subclass that has a redeclaration chain. |
918 | virtual Decl *getPreviousDeclImpl() { return nullptr; } |
919 | |
920 | /// Implementation of getMostRecentDecl(), to be overridden by any |
921 | /// subclass that has a redeclaration chain. |
922 | virtual Decl *getMostRecentDeclImpl() { return this; } |
923 | |
924 | public: |
925 | /// Iterates through all the redeclarations of the same decl. |
926 | class redecl_iterator { |
927 | /// Current - The current declaration. |
928 | Decl *Current = nullptr; |
929 | Decl *Starter; |
930 | |
931 | public: |
932 | using value_type = Decl *; |
933 | using reference = const value_type &; |
934 | using pointer = const value_type *; |
935 | using iterator_category = std::forward_iterator_tag; |
936 | using difference_type = std::ptrdiff_t; |
937 | |
938 | redecl_iterator() = default; |
939 | explicit redecl_iterator(Decl *C) : Current(C), Starter(C) {} |
940 | |
941 | reference operator*() const { return Current; } |
942 | value_type operator->() const { return Current; } |
943 | |
944 | redecl_iterator& operator++() { |
945 | assert(Current && "Advancing while iterator has reached end")((Current && "Advancing while iterator has reached end" ) ? static_cast<void> (0) : __assert_fail ("Current && \"Advancing while iterator has reached end\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 945, __PRETTY_FUNCTION__)); |
946 | // Get either previous decl or latest decl. |
947 | Decl *Next = Current->getNextRedeclarationImpl(); |
948 | assert(Next && "Should return next redeclaration or itself, never null!")((Next && "Should return next redeclaration or itself, never null!" ) ? static_cast<void> (0) : __assert_fail ("Next && \"Should return next redeclaration or itself, never null!\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 948, __PRETTY_FUNCTION__)); |
949 | Current = (Next != Starter) ? Next : nullptr; |
950 | return *this; |
951 | } |
952 | |
953 | redecl_iterator operator++(int) { |
954 | redecl_iterator tmp(*this); |
955 | ++(*this); |
956 | return tmp; |
957 | } |
958 | |
959 | friend bool operator==(redecl_iterator x, redecl_iterator y) { |
960 | return x.Current == y.Current; |
961 | } |
962 | |
963 | friend bool operator!=(redecl_iterator x, redecl_iterator y) { |
964 | return x.Current != y.Current; |
965 | } |
966 | }; |
967 | |
968 | using redecl_range = llvm::iterator_range<redecl_iterator>; |
969 | |
970 | /// Returns an iterator range for all the redeclarations of the same |
971 | /// decl. It will iterate at least once (when this decl is the only one). |
972 | redecl_range redecls() const { |
973 | return redecl_range(redecls_begin(), redecls_end()); |
974 | } |
975 | |
976 | redecl_iterator redecls_begin() const { |
977 | return redecl_iterator(const_cast<Decl *>(this)); |
978 | } |
979 | |
980 | redecl_iterator redecls_end() const { return redecl_iterator(); } |
981 | |
982 | /// Retrieve the previous declaration that declares the same entity |
983 | /// as this declaration, or NULL if there is no previous declaration. |
984 | Decl *getPreviousDecl() { return getPreviousDeclImpl(); } |
985 | |
986 | /// Retrieve the previous declaration that declares the same entity |
987 | /// as this declaration, or NULL if there is no previous declaration. |
988 | const Decl *getPreviousDecl() const { |
989 | return const_cast<Decl *>(this)->getPreviousDeclImpl(); |
990 | } |
991 | |
992 | /// True if this is the first declaration in its redeclaration chain. |
993 | bool isFirstDecl() const { |
994 | return getPreviousDecl() == nullptr; |
995 | } |
996 | |
997 | /// Retrieve the most recent declaration that declares the same entity |
998 | /// as this declaration (which may be this declaration). |
999 | Decl *getMostRecentDecl() { return getMostRecentDeclImpl(); } |
1000 | |
1001 | /// Retrieve the most recent declaration that declares the same entity |
1002 | /// as this declaration (which may be this declaration). |
1003 | const Decl *getMostRecentDecl() const { |
1004 | return const_cast<Decl *>(this)->getMostRecentDeclImpl(); |
1005 | } |
1006 | |
1007 | /// getBody - If this Decl represents a declaration for a body of code, |
1008 | /// such as a function or method definition, this method returns the |
1009 | /// top-level Stmt* of that body. Otherwise this method returns null. |
1010 | virtual Stmt* getBody() const { return nullptr; } |
1011 | |
1012 | /// Returns true if this \c Decl represents a declaration for a body of |
1013 | /// code, such as a function or method definition. |
1014 | /// Note that \c hasBody can also return true if any redeclaration of this |
1015 | /// \c Decl represents a declaration for a body of code. |
1016 | virtual bool hasBody() const { return getBody() != nullptr; } |
1017 | |
1018 | /// getBodyRBrace - Gets the right brace of the body, if a body exists. |
1019 | /// This works whether the body is a CompoundStmt or a CXXTryStmt. |
1020 | SourceLocation getBodyRBrace() const; |
1021 | |
1022 | // global temp stats (until we have a per-module visitor) |
1023 | static void add(Kind k); |
1024 | static void EnableStatistics(); |
1025 | static void PrintStats(); |
1026 | |
1027 | /// isTemplateParameter - Determines whether this declaration is a |
1028 | /// template parameter. |
1029 | bool isTemplateParameter() const; |
1030 | |
1031 | /// isTemplateParameter - Determines whether this declaration is a |
1032 | /// template parameter pack. |
1033 | bool isTemplateParameterPack() const; |
1034 | |
1035 | /// Whether this declaration is a parameter pack. |
1036 | bool isParameterPack() const; |
1037 | |
1038 | /// returns true if this declaration is a template |
1039 | bool isTemplateDecl() const; |
1040 | |
1041 | /// Whether this declaration is a function or function template. |
1042 | bool isFunctionOrFunctionTemplate() const { |
1043 | return (DeclKind >= Decl::firstFunction && |
1044 | DeclKind <= Decl::lastFunction) || |
1045 | DeclKind == FunctionTemplate; |
1046 | } |
1047 | |
1048 | /// If this is a declaration that describes some template, this |
1049 | /// method returns that template declaration. |
1050 | /// |
1051 | /// Note that this returns nullptr for partial specializations, because they |
1052 | /// are not modeled as TemplateDecls. Use getDescribedTemplateParams to handle |
1053 | /// those cases. |
1054 | TemplateDecl *getDescribedTemplate() const; |
1055 | |
1056 | /// If this is a declaration that describes some template or partial |
1057 | /// specialization, this returns the corresponding template parameter list. |
1058 | const TemplateParameterList *getDescribedTemplateParams() const; |
1059 | |
1060 | /// Returns the function itself, or the templated function if this is a |
1061 | /// function template. |
1062 | FunctionDecl *getAsFunction() LLVM_READONLY__attribute__((__pure__)); |
1063 | |
1064 | const FunctionDecl *getAsFunction() const { |
1065 | return const_cast<Decl *>(this)->getAsFunction(); |
1066 | } |
1067 | |
1068 | /// Changes the namespace of this declaration to reflect that it's |
1069 | /// a function-local extern declaration. |
1070 | /// |
1071 | /// These declarations appear in the lexical context of the extern |
1072 | /// declaration, but in the semantic context of the enclosing namespace |
1073 | /// scope. |
1074 | void setLocalExternDecl() { |
1075 | Decl *Prev = getPreviousDecl(); |
1076 | IdentifierNamespace &= ~IDNS_Ordinary; |
1077 | |
1078 | // It's OK for the declaration to still have the "invisible friend" flag or |
1079 | // the "conflicts with tag declarations in this scope" flag for the outer |
1080 | // scope. |
1081 | assert((IdentifierNamespace & ~(IDNS_OrdinaryFriend | IDNS_Tag)) == 0 &&(((IdentifierNamespace & ~(IDNS_OrdinaryFriend | IDNS_Tag )) == 0 && "namespace is not ordinary") ? static_cast <void> (0) : __assert_fail ("(IdentifierNamespace & ~(IDNS_OrdinaryFriend | IDNS_Tag)) == 0 && \"namespace is not ordinary\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 1082, __PRETTY_FUNCTION__)) |
1082 | "namespace is not ordinary")(((IdentifierNamespace & ~(IDNS_OrdinaryFriend | IDNS_Tag )) == 0 && "namespace is not ordinary") ? static_cast <void> (0) : __assert_fail ("(IdentifierNamespace & ~(IDNS_OrdinaryFriend | IDNS_Tag)) == 0 && \"namespace is not ordinary\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 1082, __PRETTY_FUNCTION__)); |
1083 | |
1084 | IdentifierNamespace |= IDNS_LocalExtern; |
1085 | if (Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary) |
1086 | IdentifierNamespace |= IDNS_Ordinary; |
1087 | } |
1088 | |
1089 | /// Determine whether this is a block-scope declaration with linkage. |
1090 | /// This will either be a local variable declaration declared 'extern', or a |
1091 | /// local function declaration. |
1092 | bool isLocalExternDecl() { |
1093 | return IdentifierNamespace & IDNS_LocalExtern; |
1094 | } |
1095 | |
1096 | /// Changes the namespace of this declaration to reflect that it's |
1097 | /// the object of a friend declaration. |
1098 | /// |
1099 | /// These declarations appear in the lexical context of the friending |
1100 | /// class, but in the semantic context of the actual entity. This property |
1101 | /// applies only to a specific decl object; other redeclarations of the |
1102 | /// same entity may not (and probably don't) share this property. |
1103 | void setObjectOfFriendDecl(bool PerformFriendInjection = false) { |
1104 | unsigned OldNS = IdentifierNamespace; |
1105 | assert((OldNS & (IDNS_Tag | IDNS_Ordinary |(((OldNS & (IDNS_Tag | IDNS_Ordinary | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator)) && "namespace includes neither ordinary nor tag" ) ? static_cast<void> (0) : __assert_fail ("(OldNS & (IDNS_Tag | IDNS_Ordinary | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator)) && \"namespace includes neither ordinary nor tag\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 1108, __PRETTY_FUNCTION__)) |
1106 | IDNS_TagFriend | IDNS_OrdinaryFriend |(((OldNS & (IDNS_Tag | IDNS_Ordinary | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator)) && "namespace includes neither ordinary nor tag" ) ? static_cast<void> (0) : __assert_fail ("(OldNS & (IDNS_Tag | IDNS_Ordinary | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator)) && \"namespace includes neither ordinary nor tag\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 1108, __PRETTY_FUNCTION__)) |
1107 | IDNS_LocalExtern | IDNS_NonMemberOperator)) &&(((OldNS & (IDNS_Tag | IDNS_Ordinary | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator)) && "namespace includes neither ordinary nor tag" ) ? static_cast<void> (0) : __assert_fail ("(OldNS & (IDNS_Tag | IDNS_Ordinary | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator)) && \"namespace includes neither ordinary nor tag\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 1108, __PRETTY_FUNCTION__)) |
1108 | "namespace includes neither ordinary nor tag")(((OldNS & (IDNS_Tag | IDNS_Ordinary | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator)) && "namespace includes neither ordinary nor tag" ) ? static_cast<void> (0) : __assert_fail ("(OldNS & (IDNS_Tag | IDNS_Ordinary | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator)) && \"namespace includes neither ordinary nor tag\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 1108, __PRETTY_FUNCTION__)); |
1109 | assert(!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type |((!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator )) && "namespace includes other than ordinary or tag" ) ? static_cast<void> (0) : __assert_fail ("!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator)) && \"namespace includes other than ordinary or tag\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 1112, __PRETTY_FUNCTION__)) |
1110 | IDNS_TagFriend | IDNS_OrdinaryFriend |((!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator )) && "namespace includes other than ordinary or tag" ) ? static_cast<void> (0) : __assert_fail ("!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator)) && \"namespace includes other than ordinary or tag\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 1112, __PRETTY_FUNCTION__)) |
1111 | IDNS_LocalExtern | IDNS_NonMemberOperator)) &&((!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator )) && "namespace includes other than ordinary or tag" ) ? static_cast<void> (0) : __assert_fail ("!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator)) && \"namespace includes other than ordinary or tag\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 1112, __PRETTY_FUNCTION__)) |
1112 | "namespace includes other than ordinary or tag")((!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator )) && "namespace includes other than ordinary or tag" ) ? static_cast<void> (0) : __assert_fail ("!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type | IDNS_TagFriend | IDNS_OrdinaryFriend | IDNS_LocalExtern | IDNS_NonMemberOperator)) && \"namespace includes other than ordinary or tag\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 1112, __PRETTY_FUNCTION__)); |
1113 | |
1114 | Decl *Prev = getPreviousDecl(); |
1115 | IdentifierNamespace &= ~(IDNS_Ordinary | IDNS_Tag | IDNS_Type); |
1116 | |
1117 | if (OldNS & (IDNS_Tag | IDNS_TagFriend)) { |
1118 | IdentifierNamespace |= IDNS_TagFriend; |
1119 | if (PerformFriendInjection || |
1120 | (Prev && Prev->getIdentifierNamespace() & IDNS_Tag)) |
1121 | IdentifierNamespace |= IDNS_Tag | IDNS_Type; |
1122 | } |
1123 | |
1124 | if (OldNS & (IDNS_Ordinary | IDNS_OrdinaryFriend | |
1125 | IDNS_LocalExtern | IDNS_NonMemberOperator)) { |
1126 | IdentifierNamespace |= IDNS_OrdinaryFriend; |
1127 | if (PerformFriendInjection || |
1128 | (Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary)) |
1129 | IdentifierNamespace |= IDNS_Ordinary; |
1130 | } |
1131 | } |
1132 | |
1133 | enum FriendObjectKind { |
1134 | FOK_None, ///< Not a friend object. |
1135 | FOK_Declared, ///< A friend of a previously-declared entity. |
1136 | FOK_Undeclared ///< A friend of a previously-undeclared entity. |
1137 | }; |
1138 | |
1139 | /// Determines whether this declaration is the object of a |
1140 | /// friend declaration and, if so, what kind. |
1141 | /// |
1142 | /// There is currently no direct way to find the associated FriendDecl. |
1143 | FriendObjectKind getFriendObjectKind() const { |
1144 | unsigned mask = |
1145 | (IdentifierNamespace & (IDNS_TagFriend | IDNS_OrdinaryFriend)); |
1146 | if (!mask) return FOK_None; |
1147 | return (IdentifierNamespace & (IDNS_Tag | IDNS_Ordinary) ? FOK_Declared |
1148 | : FOK_Undeclared); |
1149 | } |
1150 | |
1151 | /// Specifies that this declaration is a C++ overloaded non-member. |
1152 | void setNonMemberOperator() { |
1153 | assert(getKind() == Function || getKind() == FunctionTemplate)((getKind() == Function || getKind() == FunctionTemplate) ? static_cast <void> (0) : __assert_fail ("getKind() == Function || getKind() == FunctionTemplate" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 1153, __PRETTY_FUNCTION__)); |
1154 | assert((IdentifierNamespace & IDNS_Ordinary) &&(((IdentifierNamespace & IDNS_Ordinary) && "visible non-member operators should be in ordinary namespace" ) ? static_cast<void> (0) : __assert_fail ("(IdentifierNamespace & IDNS_Ordinary) && \"visible non-member operators should be in ordinary namespace\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 1155, __PRETTY_FUNCTION__)) |
1155 | "visible non-member operators should be in ordinary namespace")(((IdentifierNamespace & IDNS_Ordinary) && "visible non-member operators should be in ordinary namespace" ) ? static_cast<void> (0) : __assert_fail ("(IdentifierNamespace & IDNS_Ordinary) && \"visible non-member operators should be in ordinary namespace\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 1155, __PRETTY_FUNCTION__)); |
1156 | IdentifierNamespace |= IDNS_NonMemberOperator; |
1157 | } |
1158 | |
1159 | static bool classofKind(Kind K) { return true; } |
1160 | static DeclContext *castToDeclContext(const Decl *); |
1161 | static Decl *castFromDeclContext(const DeclContext *); |
1162 | |
1163 | void print(raw_ostream &Out, unsigned Indentation = 0, |
1164 | bool PrintInstantiation = false) const; |
1165 | void print(raw_ostream &Out, const PrintingPolicy &Policy, |
1166 | unsigned Indentation = 0, bool PrintInstantiation = false) const; |
1167 | static void printGroup(Decl** Begin, unsigned NumDecls, |
1168 | raw_ostream &Out, const PrintingPolicy &Policy, |
1169 | unsigned Indentation = 0); |
1170 | |
1171 | // Debuggers don't usually respect default arguments. |
1172 | void dump() const; |
1173 | |
1174 | // Same as dump(), but forces color printing. |
1175 | void dumpColor() const; |
1176 | |
1177 | void dump(raw_ostream &Out, bool Deserialize = false, |
1178 | ASTDumpOutputFormat OutputFormat = ADOF_Default) const; |
1179 | |
1180 | /// \return Unique reproducible object identifier |
1181 | int64_t getID() const; |
1182 | |
1183 | /// Looks through the Decl's underlying type to extract a FunctionType |
1184 | /// when possible. Will return null if the type underlying the Decl does not |
1185 | /// have a FunctionType. |
1186 | const FunctionType *getFunctionType(bool BlocksToo = true) const; |
1187 | |
1188 | private: |
1189 | void setAttrsImpl(const AttrVec& Attrs, ASTContext &Ctx); |
1190 | void setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC, |
1191 | ASTContext &Ctx); |
1192 | |
1193 | protected: |
1194 | ASTMutationListener *getASTMutationListener() const; |
1195 | }; |
1196 | |
1197 | /// Determine whether two declarations declare the same entity. |
1198 | inline bool declaresSameEntity(const Decl *D1, const Decl *D2) { |
1199 | if (!D1 || !D2) |
1200 | return false; |
1201 | |
1202 | if (D1 == D2) |
1203 | return true; |
1204 | |
1205 | return D1->getCanonicalDecl() == D2->getCanonicalDecl(); |
1206 | } |
1207 | |
1208 | /// PrettyStackTraceDecl - If a crash occurs, indicate that it happened when |
1209 | /// doing something to a specific decl. |
1210 | class PrettyStackTraceDecl : public llvm::PrettyStackTraceEntry { |
1211 | const Decl *TheDecl; |
1212 | SourceLocation Loc; |
1213 | SourceManager &SM; |
1214 | const char *Message; |
1215 | |
1216 | public: |
1217 | PrettyStackTraceDecl(const Decl *theDecl, SourceLocation L, |
1218 | SourceManager &sm, const char *Msg) |
1219 | : TheDecl(theDecl), Loc(L), SM(sm), Message(Msg) {} |
1220 | |
1221 | void print(raw_ostream &OS) const override; |
1222 | }; |
1223 | |
1224 | /// The results of name lookup within a DeclContext. This is either a |
1225 | /// single result (with no stable storage) or a collection of results (with |
1226 | /// stable storage provided by the lookup table). |
1227 | class DeclContextLookupResult { |
1228 | using ResultTy = ArrayRef<NamedDecl *>; |
1229 | |
1230 | ResultTy Result; |
1231 | |
1232 | // If there is only one lookup result, it would be invalidated by |
1233 | // reallocations of the name table, so store it separately. |
1234 | NamedDecl *Single = nullptr; |
1235 | |
1236 | static NamedDecl *const SingleElementDummyList; |
1237 | |
1238 | public: |
1239 | DeclContextLookupResult() = default; |
1240 | DeclContextLookupResult(ArrayRef<NamedDecl *> Result) |
1241 | : Result(Result) {} |
1242 | DeclContextLookupResult(NamedDecl *Single) |
1243 | : Result(SingleElementDummyList), Single(Single) {} |
1244 | |
1245 | class iterator; |
1246 | |
1247 | using IteratorBase = |
1248 | llvm::iterator_adaptor_base<iterator, ResultTy::iterator, |
1249 | std::random_access_iterator_tag, NamedDecl *>; |
1250 | |
1251 | class iterator : public IteratorBase { |
1252 | value_type SingleElement; |
1253 | |
1254 | public: |
1255 | explicit iterator(pointer Pos, value_type Single = nullptr) |
1256 | : IteratorBase(Pos), SingleElement(Single) {} |
1257 | |
1258 | reference operator*() const { |
1259 | return SingleElement ? SingleElement : IteratorBase::operator*(); |
1260 | } |
1261 | }; |
1262 | |
1263 | using const_iterator = iterator; |
1264 | using pointer = iterator::pointer; |
1265 | using reference = iterator::reference; |
1266 | |
1267 | iterator begin() const { return iterator(Result.begin(), Single); } |
1268 | iterator end() const { return iterator(Result.end(), Single); } |
1269 | |
1270 | bool empty() const { return Result.empty(); } |
1271 | pointer data() const { return Single ? &Single : Result.data(); } |
1272 | size_t size() const { return Single ? 1 : Result.size(); } |
1273 | reference front() const { return Single ? Single : Result.front(); } |
1274 | reference back() const { return Single ? Single : Result.back(); } |
1275 | reference operator[](size_t N) const { return Single ? Single : Result[N]; } |
1276 | |
1277 | // FIXME: Remove this from the interface |
1278 | DeclContextLookupResult slice(size_t N) const { |
1279 | DeclContextLookupResult Sliced = Result.slice(N); |
1280 | Sliced.Single = Single; |
1281 | return Sliced; |
1282 | } |
1283 | }; |
1284 | |
1285 | /// DeclContext - This is used only as base class of specific decl types that |
1286 | /// can act as declaration contexts. These decls are (only the top classes |
1287 | /// that directly derive from DeclContext are mentioned, not their subclasses): |
1288 | /// |
1289 | /// TranslationUnitDecl |
1290 | /// ExternCContext |
1291 | /// NamespaceDecl |
1292 | /// TagDecl |
1293 | /// OMPDeclareReductionDecl |
1294 | /// OMPDeclareMapperDecl |
1295 | /// FunctionDecl |
1296 | /// ObjCMethodDecl |
1297 | /// ObjCContainerDecl |
1298 | /// LinkageSpecDecl |
1299 | /// ExportDecl |
1300 | /// BlockDecl |
1301 | /// CapturedDecl |
1302 | class DeclContext { |
1303 | /// For makeDeclVisibleInContextImpl |
1304 | friend class ASTDeclReader; |
1305 | /// For reconcileExternalVisibleStorage, CreateStoredDeclsMap, |
1306 | /// hasNeedToReconcileExternalVisibleStorage |
1307 | friend class ExternalASTSource; |
1308 | /// For CreateStoredDeclsMap |
1309 | friend class DependentDiagnostic; |
1310 | /// For hasNeedToReconcileExternalVisibleStorage, |
1311 | /// hasLazyLocalLexicalLookups, hasLazyExternalLexicalLookups |
1312 | friend class ASTWriter; |
1313 | |
1314 | // We use uint64_t in the bit-fields below since some bit-fields |
1315 | // cross the unsigned boundary and this breaks the packing. |
1316 | |
1317 | /// Stores the bits used by DeclContext. |
1318 | /// If modified NumDeclContextBit, the ctor of DeclContext and the accessor |
1319 | /// methods in DeclContext should be updated appropriately. |
1320 | class DeclContextBitfields { |
1321 | friend class DeclContext; |
1322 | /// DeclKind - This indicates which class this is. |
1323 | uint64_t DeclKind : 7; |
1324 | |
1325 | /// Whether this declaration context also has some external |
1326 | /// storage that contains additional declarations that are lexically |
1327 | /// part of this context. |
1328 | mutable uint64_t ExternalLexicalStorage : 1; |
1329 | |
1330 | /// Whether this declaration context also has some external |
1331 | /// storage that contains additional declarations that are visible |
1332 | /// in this context. |
1333 | mutable uint64_t ExternalVisibleStorage : 1; |
1334 | |
1335 | /// Whether this declaration context has had externally visible |
1336 | /// storage added since the last lookup. In this case, \c LookupPtr's |
1337 | /// invariant may not hold and needs to be fixed before we perform |
1338 | /// another lookup. |
1339 | mutable uint64_t NeedToReconcileExternalVisibleStorage : 1; |
1340 | |
1341 | /// If \c true, this context may have local lexical declarations |
1342 | /// that are missing from the lookup table. |
1343 | mutable uint64_t HasLazyLocalLexicalLookups : 1; |
1344 | |
1345 | /// If \c true, the external source may have lexical declarations |
1346 | /// that are missing from the lookup table. |
1347 | mutable uint64_t HasLazyExternalLexicalLookups : 1; |
1348 | |
1349 | /// If \c true, lookups should only return identifier from |
1350 | /// DeclContext scope (for example TranslationUnit). Used in |
1351 | /// LookupQualifiedName() |
1352 | mutable uint64_t UseQualifiedLookup : 1; |
1353 | }; |
1354 | |
1355 | /// Number of bits in DeclContextBitfields. |
1356 | enum { NumDeclContextBits = 13 }; |
1357 | |
1358 | /// Stores the bits used by TagDecl. |
1359 | /// If modified NumTagDeclBits and the accessor |
1360 | /// methods in TagDecl should be updated appropriately. |
1361 | class TagDeclBitfields { |
1362 | friend class TagDecl; |
1363 | /// For the bits in DeclContextBitfields |
1364 | uint64_t : NumDeclContextBits; |
1365 | |
1366 | /// The TagKind enum. |
1367 | uint64_t TagDeclKind : 3; |
1368 | |
1369 | /// True if this is a definition ("struct foo {};"), false if it is a |
1370 | /// declaration ("struct foo;"). It is not considered a definition |
1371 | /// until the definition has been fully processed. |
1372 | uint64_t IsCompleteDefinition : 1; |
1373 | |
1374 | /// True if this is currently being defined. |
1375 | uint64_t IsBeingDefined : 1; |
1376 | |
1377 | /// True if this tag declaration is "embedded" (i.e., defined or declared |
1378 | /// for the very first time) in the syntax of a declarator. |
1379 | uint64_t IsEmbeddedInDeclarator : 1; |
1380 | |
1381 | /// True if this tag is free standing, e.g. "struct foo;". |
1382 | uint64_t IsFreeStanding : 1; |
1383 | |
1384 | /// Indicates whether it is possible for declarations of this kind |
1385 | /// to have an out-of-date definition. |
1386 | /// |
1387 | /// This option is only enabled when modules are enabled. |
1388 | uint64_t MayHaveOutOfDateDef : 1; |
1389 | |
1390 | /// Has the full definition of this type been required by a use somewhere in |
1391 | /// the TU. |
1392 | uint64_t IsCompleteDefinitionRequired : 1; |
1393 | }; |
1394 | |
1395 | /// Number of non-inherited bits in TagDeclBitfields. |
1396 | enum { NumTagDeclBits = 9 }; |
1397 | |
1398 | /// Stores the bits used by EnumDecl. |
1399 | /// If modified NumEnumDeclBit and the accessor |
1400 | /// methods in EnumDecl should be updated appropriately. |
1401 | class EnumDeclBitfields { |
1402 | friend class EnumDecl; |
1403 | /// For the bits in DeclContextBitfields. |
1404 | uint64_t : NumDeclContextBits; |
1405 | /// For the bits in TagDeclBitfields. |
1406 | uint64_t : NumTagDeclBits; |
1407 | |
1408 | /// Width in bits required to store all the non-negative |
1409 | /// enumerators of this enum. |
1410 | uint64_t NumPositiveBits : 8; |
1411 | |
1412 | /// Width in bits required to store all the negative |
1413 | /// enumerators of this enum. |
1414 | uint64_t NumNegativeBits : 8; |
1415 | |
1416 | /// True if this tag declaration is a scoped enumeration. Only |
1417 | /// possible in C++11 mode. |
1418 | uint64_t IsScoped : 1; |
1419 | |
1420 | /// If this tag declaration is a scoped enum, |
1421 | /// then this is true if the scoped enum was declared using the class |
1422 | /// tag, false if it was declared with the struct tag. No meaning is |
1423 | /// associated if this tag declaration is not a scoped enum. |
1424 | uint64_t IsScopedUsingClassTag : 1; |
1425 | |
1426 | /// True if this is an enumeration with fixed underlying type. Only |
1427 | /// possible in C++11, Microsoft extensions, or Objective C mode. |
1428 | uint64_t IsFixed : 1; |
1429 | |
1430 | /// True if a valid hash is stored in ODRHash. |
1431 | uint64_t HasODRHash : 1; |
1432 | }; |
1433 | |
1434 | /// Number of non-inherited bits in EnumDeclBitfields. |
1435 | enum { NumEnumDeclBits = 20 }; |
1436 | |
1437 | /// Stores the bits used by RecordDecl. |
1438 | /// If modified NumRecordDeclBits and the accessor |
1439 | /// methods in RecordDecl should be updated appropriately. |
1440 | class RecordDeclBitfields { |
1441 | friend class RecordDecl; |
1442 | /// For the bits in DeclContextBitfields. |
1443 | uint64_t : NumDeclContextBits; |
1444 | /// For the bits in TagDeclBitfields. |
1445 | uint64_t : NumTagDeclBits; |
1446 | |
1447 | /// This is true if this struct ends with a flexible |
1448 | /// array member (e.g. int X[]) or if this union contains a struct that does. |
1449 | /// If so, this cannot be contained in arrays or other structs as a member. |
1450 | uint64_t HasFlexibleArrayMember : 1; |
1451 | |
1452 | /// Whether this is the type of an anonymous struct or union. |
1453 | uint64_t AnonymousStructOrUnion : 1; |
1454 | |
1455 | /// This is true if this struct has at least one member |
1456 | /// containing an Objective-C object pointer type. |
1457 | uint64_t HasObjectMember : 1; |
1458 | |
1459 | /// This is true if struct has at least one member of |
1460 | /// 'volatile' type. |
1461 | uint64_t HasVolatileMember : 1; |
1462 | |
1463 | /// Whether the field declarations of this record have been loaded |
1464 | /// from external storage. To avoid unnecessary deserialization of |
1465 | /// methods/nested types we allow deserialization of just the fields |
1466 | /// when needed. |
1467 | mutable uint64_t LoadedFieldsFromExternalStorage : 1; |
1468 | |
1469 | /// Basic properties of non-trivial C structs. |
1470 | uint64_t NonTrivialToPrimitiveDefaultInitialize : 1; |
1471 | uint64_t NonTrivialToPrimitiveCopy : 1; |
1472 | uint64_t NonTrivialToPrimitiveDestroy : 1; |
1473 | |
1474 | /// The following bits indicate whether this is or contains a C union that |
1475 | /// is non-trivial to default-initialize, destruct, or copy. These bits |
1476 | /// imply the associated basic non-triviality predicates declared above. |
1477 | uint64_t HasNonTrivialToPrimitiveDefaultInitializeCUnion : 1; |
1478 | uint64_t HasNonTrivialToPrimitiveDestructCUnion : 1; |
1479 | uint64_t HasNonTrivialToPrimitiveCopyCUnion : 1; |
1480 | |
1481 | /// Indicates whether this struct is destroyed in the callee. |
1482 | uint64_t ParamDestroyedInCallee : 1; |
1483 | |
1484 | /// Represents the way this type is passed to a function. |
1485 | uint64_t ArgPassingRestrictions : 2; |
1486 | }; |
1487 | |
1488 | /// Number of non-inherited bits in RecordDeclBitfields. |
1489 | enum { NumRecordDeclBits = 14 }; |
1490 | |
1491 | /// Stores the bits used by OMPDeclareReductionDecl. |
1492 | /// If modified NumOMPDeclareReductionDeclBits and the accessor |
1493 | /// methods in OMPDeclareReductionDecl should be updated appropriately. |
1494 | class OMPDeclareReductionDeclBitfields { |
1495 | friend class OMPDeclareReductionDecl; |
1496 | /// For the bits in DeclContextBitfields |
1497 | uint64_t : NumDeclContextBits; |
1498 | |
1499 | /// Kind of initializer, |
1500 | /// function call or omp_priv<init_expr> initializtion. |
1501 | uint64_t InitializerKind : 2; |
1502 | }; |
1503 | |
1504 | /// Number of non-inherited bits in OMPDeclareReductionDeclBitfields. |
1505 | enum { NumOMPDeclareReductionDeclBits = 2 }; |
1506 | |
1507 | /// Stores the bits used by FunctionDecl. |
1508 | /// If modified NumFunctionDeclBits and the accessor |
1509 | /// methods in FunctionDecl and CXXDeductionGuideDecl |
1510 | /// (for IsCopyDeductionCandidate) should be updated appropriately. |
1511 | class FunctionDeclBitfields { |
1512 | friend class FunctionDecl; |
1513 | /// For IsCopyDeductionCandidate |
1514 | friend class CXXDeductionGuideDecl; |
1515 | /// For the bits in DeclContextBitfields. |
1516 | uint64_t : NumDeclContextBits; |
1517 | |
1518 | uint64_t SClass : 3; |
1519 | uint64_t IsInline : 1; |
1520 | uint64_t IsInlineSpecified : 1; |
1521 | |
1522 | uint64_t IsVirtualAsWritten : 1; |
1523 | uint64_t IsPure : 1; |
1524 | uint64_t HasInheritedPrototype : 1; |
1525 | uint64_t HasWrittenPrototype : 1; |
1526 | uint64_t IsDeleted : 1; |
1527 | /// Used by CXXMethodDecl |
1528 | uint64_t IsTrivial : 1; |
1529 | |
1530 | /// This flag indicates whether this function is trivial for the purpose of |
1531 | /// calls. This is meaningful only when this function is a copy/move |
1532 | /// constructor or a destructor. |
1533 | uint64_t IsTrivialForCall : 1; |
1534 | |
1535 | uint64_t IsDefaulted : 1; |
1536 | uint64_t IsExplicitlyDefaulted : 1; |
1537 | uint64_t HasDefaultedFunctionInfo : 1; |
1538 | uint64_t HasImplicitReturnZero : 1; |
1539 | uint64_t IsLateTemplateParsed : 1; |
1540 | |
1541 | /// Kind of contexpr specifier as defined by ConstexprSpecKind. |
1542 | uint64_t ConstexprKind : 2; |
1543 | uint64_t InstantiationIsPending : 1; |
1544 | |
1545 | /// Indicates if the function uses __try. |
1546 | uint64_t UsesSEHTry : 1; |
1547 | |
1548 | /// Indicates if the function was a definition |
1549 | /// but its body was skipped. |
1550 | uint64_t HasSkippedBody : 1; |
1551 | |
1552 | /// Indicates if the function declaration will |
1553 | /// have a body, once we're done parsing it. |
1554 | uint64_t WillHaveBody : 1; |
1555 | |
1556 | /// Indicates that this function is a multiversioned |
1557 | /// function using attribute 'target'. |
1558 | uint64_t IsMultiVersion : 1; |
1559 | |
1560 | /// [C++17] Only used by CXXDeductionGuideDecl. Indicates that |
1561 | /// the Deduction Guide is the implicitly generated 'copy |
1562 | /// deduction candidate' (is used during overload resolution). |
1563 | uint64_t IsCopyDeductionCandidate : 1; |
1564 | |
1565 | /// Store the ODRHash after first calculation. |
1566 | uint64_t HasODRHash : 1; |
1567 | |
1568 | /// Indicates if the function uses Floating Point Constrained Intrinsics |
1569 | uint64_t UsesFPIntrin : 1; |
1570 | }; |
1571 | |
1572 | /// Number of non-inherited bits in FunctionDeclBitfields. |
1573 | enum { NumFunctionDeclBits = 27 }; |
1574 | |
1575 | /// Stores the bits used by CXXConstructorDecl. If modified |
1576 | /// NumCXXConstructorDeclBits and the accessor |
1577 | /// methods in CXXConstructorDecl should be updated appropriately. |
1578 | class CXXConstructorDeclBitfields { |
1579 | friend class CXXConstructorDecl; |
1580 | /// For the bits in DeclContextBitfields. |
1581 | uint64_t : NumDeclContextBits; |
1582 | /// For the bits in FunctionDeclBitfields. |
1583 | uint64_t : NumFunctionDeclBits; |
1584 | |
1585 | /// 24 bits to fit in the remaining available space. |
1586 | /// Note that this makes CXXConstructorDeclBitfields take |
1587 | /// exactly 64 bits and thus the width of NumCtorInitializers |
1588 | /// will need to be shrunk if some bit is added to NumDeclContextBitfields, |
1589 | /// NumFunctionDeclBitfields or CXXConstructorDeclBitfields. |
1590 | uint64_t NumCtorInitializers : 21; |
1591 | uint64_t IsInheritingConstructor : 1; |
1592 | |
1593 | /// Whether this constructor has a trail-allocated explicit specifier. |
1594 | uint64_t HasTrailingExplicitSpecifier : 1; |
1595 | /// If this constructor does't have a trail-allocated explicit specifier. |
1596 | /// Whether this constructor is explicit specified. |
1597 | uint64_t IsSimpleExplicit : 1; |
1598 | }; |
1599 | |
1600 | /// Number of non-inherited bits in CXXConstructorDeclBitfields. |
1601 | enum { |
1602 | NumCXXConstructorDeclBits = 64 - NumDeclContextBits - NumFunctionDeclBits |
1603 | }; |
1604 | |
1605 | /// Stores the bits used by ObjCMethodDecl. |
1606 | /// If modified NumObjCMethodDeclBits and the accessor |
1607 | /// methods in ObjCMethodDecl should be updated appropriately. |
1608 | class ObjCMethodDeclBitfields { |
1609 | friend class ObjCMethodDecl; |
1610 | |
1611 | /// For the bits in DeclContextBitfields. |
1612 | uint64_t : NumDeclContextBits; |
1613 | |
1614 | /// The conventional meaning of this method; an ObjCMethodFamily. |
1615 | /// This is not serialized; instead, it is computed on demand and |
1616 | /// cached. |
1617 | mutable uint64_t Family : ObjCMethodFamilyBitWidth; |
1618 | |
1619 | /// instance (true) or class (false) method. |
1620 | uint64_t IsInstance : 1; |
1621 | uint64_t IsVariadic : 1; |
1622 | |
1623 | /// True if this method is the getter or setter for an explicit property. |
1624 | uint64_t IsPropertyAccessor : 1; |
1625 | |
1626 | /// True if this method is a synthesized property accessor stub. |
1627 | uint64_t IsSynthesizedAccessorStub : 1; |
1628 | |
1629 | /// Method has a definition. |
1630 | uint64_t IsDefined : 1; |
1631 | |
1632 | /// Method redeclaration in the same interface. |
1633 | uint64_t IsRedeclaration : 1; |
1634 | |
1635 | /// Is redeclared in the same interface. |
1636 | mutable uint64_t HasRedeclaration : 1; |
1637 | |
1638 | /// \@required/\@optional |
1639 | uint64_t DeclImplementation : 2; |
1640 | |
1641 | /// in, inout, etc. |
1642 | uint64_t objcDeclQualifier : 7; |
1643 | |
1644 | /// Indicates whether this method has a related result type. |
1645 | uint64_t RelatedResultType : 1; |
1646 | |
1647 | /// Whether the locations of the selector identifiers are in a |
1648 | /// "standard" position, a enum SelectorLocationsKind. |
1649 | uint64_t SelLocsKind : 2; |
1650 | |
1651 | /// Whether this method overrides any other in the class hierarchy. |
1652 | /// |
1653 | /// A method is said to override any method in the class's |
1654 | /// base classes, its protocols, or its categories' protocols, that has |
1655 | /// the same selector and is of the same kind (class or instance). |
1656 | /// A method in an implementation is not considered as overriding the same |
1657 | /// method in the interface or its categories. |
1658 | uint64_t IsOverriding : 1; |
1659 | |
1660 | /// Indicates if the method was a definition but its body was skipped. |
1661 | uint64_t HasSkippedBody : 1; |
1662 | }; |
1663 | |
1664 | /// Number of non-inherited bits in ObjCMethodDeclBitfields. |
1665 | enum { NumObjCMethodDeclBits = 24 }; |
1666 | |
1667 | /// Stores the bits used by ObjCContainerDecl. |
1668 | /// If modified NumObjCContainerDeclBits and the accessor |
1669 | /// methods in ObjCContainerDecl should be updated appropriately. |
1670 | class ObjCContainerDeclBitfields { |
1671 | friend class ObjCContainerDecl; |
1672 | /// For the bits in DeclContextBitfields |
1673 | uint32_t : NumDeclContextBits; |
1674 | |
1675 | // Not a bitfield but this saves space. |
1676 | // Note that ObjCContainerDeclBitfields is full. |
1677 | SourceLocation AtStart; |
1678 | }; |
1679 | |
1680 | /// Number of non-inherited bits in ObjCContainerDeclBitfields. |
1681 | /// Note that here we rely on the fact that SourceLocation is 32 bits |
1682 | /// wide. We check this with the static_assert in the ctor of DeclContext. |
1683 | enum { NumObjCContainerDeclBits = 64 - NumDeclContextBits }; |
1684 | |
1685 | /// Stores the bits used by LinkageSpecDecl. |
1686 | /// If modified NumLinkageSpecDeclBits and the accessor |
1687 | /// methods in LinkageSpecDecl should be updated appropriately. |
1688 | class LinkageSpecDeclBitfields { |
1689 | friend class LinkageSpecDecl; |
1690 | /// For the bits in DeclContextBitfields. |
1691 | uint64_t : NumDeclContextBits; |
1692 | |
1693 | /// The language for this linkage specification with values |
1694 | /// in the enum LinkageSpecDecl::LanguageIDs. |
1695 | uint64_t Language : 3; |
1696 | |
1697 | /// True if this linkage spec has braces. |
1698 | /// This is needed so that hasBraces() returns the correct result while the |
1699 | /// linkage spec body is being parsed. Once RBraceLoc has been set this is |
1700 | /// not used, so it doesn't need to be serialized. |
1701 | uint64_t HasBraces : 1; |
1702 | }; |
1703 | |
1704 | /// Number of non-inherited bits in LinkageSpecDeclBitfields. |
1705 | enum { NumLinkageSpecDeclBits = 4 }; |
1706 | |
1707 | /// Stores the bits used by BlockDecl. |
1708 | /// If modified NumBlockDeclBits and the accessor |
1709 | /// methods in BlockDecl should be updated appropriately. |
1710 | class BlockDeclBitfields { |
1711 | friend class BlockDecl; |
1712 | /// For the bits in DeclContextBitfields. |
1713 | uint64_t : NumDeclContextBits; |
1714 | |
1715 | uint64_t IsVariadic : 1; |
1716 | uint64_t CapturesCXXThis : 1; |
1717 | uint64_t BlockMissingReturnType : 1; |
1718 | uint64_t IsConversionFromLambda : 1; |
1719 | |
1720 | /// A bit that indicates this block is passed directly to a function as a |
1721 | /// non-escaping parameter. |
1722 | uint64_t DoesNotEscape : 1; |
1723 | |
1724 | /// A bit that indicates whether it's possible to avoid coying this block to |
1725 | /// the heap when it initializes or is assigned to a local variable with |
1726 | /// automatic storage. |
1727 | uint64_t CanAvoidCopyToHeap : 1; |
1728 | }; |
1729 | |
1730 | /// Number of non-inherited bits in BlockDeclBitfields. |
1731 | enum { NumBlockDeclBits = 5 }; |
1732 | |
1733 | /// Pointer to the data structure used to lookup declarations |
1734 | /// within this context (or a DependentStoredDeclsMap if this is a |
1735 | /// dependent context). We maintain the invariant that, if the map |
1736 | /// contains an entry for a DeclarationName (and we haven't lazily |
1737 | /// omitted anything), then it contains all relevant entries for that |
1738 | /// name (modulo the hasExternalDecls() flag). |
1739 | mutable StoredDeclsMap *LookupPtr = nullptr; |
1740 | |
1741 | protected: |
1742 | /// This anonymous union stores the bits belonging to DeclContext and classes |
1743 | /// deriving from it. The goal is to use otherwise wasted |
1744 | /// space in DeclContext to store data belonging to derived classes. |
1745 | /// The space saved is especially significient when pointers are aligned |
1746 | /// to 8 bytes. In this case due to alignment requirements we have a |
1747 | /// little less than 8 bytes free in DeclContext which we can use. |
1748 | /// We check that none of the classes in this union is larger than |
1749 | /// 8 bytes with static_asserts in the ctor of DeclContext. |
1750 | union { |
1751 | DeclContextBitfields DeclContextBits; |
1752 | TagDeclBitfields TagDeclBits; |
1753 | EnumDeclBitfields EnumDeclBits; |
1754 | RecordDeclBitfields RecordDeclBits; |
1755 | OMPDeclareReductionDeclBitfields OMPDeclareReductionDeclBits; |
1756 | FunctionDeclBitfields FunctionDeclBits; |
1757 | CXXConstructorDeclBitfields CXXConstructorDeclBits; |
1758 | ObjCMethodDeclBitfields ObjCMethodDeclBits; |
1759 | ObjCContainerDeclBitfields ObjCContainerDeclBits; |
1760 | LinkageSpecDeclBitfields LinkageSpecDeclBits; |
1761 | BlockDeclBitfields BlockDeclBits; |
1762 | |
1763 | static_assert(sizeof(DeclContextBitfields) <= 8, |
1764 | "DeclContextBitfields is larger than 8 bytes!"); |
1765 | static_assert(sizeof(TagDeclBitfields) <= 8, |
1766 | "TagDeclBitfields is larger than 8 bytes!"); |
1767 | static_assert(sizeof(EnumDeclBitfields) <= 8, |
1768 | "EnumDeclBitfields is larger than 8 bytes!"); |
1769 | static_assert(sizeof(RecordDeclBitfields) <= 8, |
1770 | "RecordDeclBitfields is larger than 8 bytes!"); |
1771 | static_assert(sizeof(OMPDeclareReductionDeclBitfields) <= 8, |
1772 | "OMPDeclareReductionDeclBitfields is larger than 8 bytes!"); |
1773 | static_assert(sizeof(FunctionDeclBitfields) <= 8, |
1774 | "FunctionDeclBitfields is larger than 8 bytes!"); |
1775 | static_assert(sizeof(CXXConstructorDeclBitfields) <= 8, |
1776 | "CXXConstructorDeclBitfields is larger than 8 bytes!"); |
1777 | static_assert(sizeof(ObjCMethodDeclBitfields) <= 8, |
1778 | "ObjCMethodDeclBitfields is larger than 8 bytes!"); |
1779 | static_assert(sizeof(ObjCContainerDeclBitfields) <= 8, |
1780 | "ObjCContainerDeclBitfields is larger than 8 bytes!"); |
1781 | static_assert(sizeof(LinkageSpecDeclBitfields) <= 8, |
1782 | "LinkageSpecDeclBitfields is larger than 8 bytes!"); |
1783 | static_assert(sizeof(BlockDeclBitfields) <= 8, |
1784 | "BlockDeclBitfields is larger than 8 bytes!"); |
1785 | }; |
1786 | |
1787 | /// FirstDecl - The first declaration stored within this declaration |
1788 | /// context. |
1789 | mutable Decl *FirstDecl = nullptr; |
1790 | |
1791 | /// LastDecl - The last declaration stored within this declaration |
1792 | /// context. FIXME: We could probably cache this value somewhere |
1793 | /// outside of the DeclContext, to reduce the size of DeclContext by |
1794 | /// another pointer. |
1795 | mutable Decl *LastDecl = nullptr; |
1796 | |
1797 | /// Build up a chain of declarations. |
1798 | /// |
1799 | /// \returns the first/last pair of declarations. |
1800 | static std::pair<Decl *, Decl *> |
1801 | BuildDeclChain(ArrayRef<Decl*> Decls, bool FieldsAlreadyLoaded); |
1802 | |
1803 | DeclContext(Decl::Kind K); |
1804 | |
1805 | public: |
1806 | ~DeclContext(); |
1807 | |
1808 | Decl::Kind getDeclKind() const { |
1809 | return static_cast<Decl::Kind>(DeclContextBits.DeclKind); |
1810 | } |
1811 | |
1812 | const char *getDeclKindName() const; |
1813 | |
1814 | /// getParent - Returns the containing DeclContext. |
1815 | DeclContext *getParent() { |
1816 | return cast<Decl>(this)->getDeclContext(); |
1817 | } |
1818 | const DeclContext *getParent() const { |
1819 | return const_cast<DeclContext*>(this)->getParent(); |
1820 | } |
1821 | |
1822 | /// getLexicalParent - Returns the containing lexical DeclContext. May be |
1823 | /// different from getParent, e.g.: |
1824 | /// |
1825 | /// namespace A { |
1826 | /// struct S; |
1827 | /// } |
1828 | /// struct A::S {}; // getParent() == namespace 'A' |
1829 | /// // getLexicalParent() == translation unit |
1830 | /// |
1831 | DeclContext *getLexicalParent() { |
1832 | return cast<Decl>(this)->getLexicalDeclContext(); |
1833 | } |
1834 | const DeclContext *getLexicalParent() const { |
1835 | return const_cast<DeclContext*>(this)->getLexicalParent(); |
1836 | } |
1837 | |
1838 | DeclContext *getLookupParent(); |
1839 | |
1840 | const DeclContext *getLookupParent() const { |
1841 | return const_cast<DeclContext*>(this)->getLookupParent(); |
1842 | } |
1843 | |
1844 | ASTContext &getParentASTContext() const { |
1845 | return cast<Decl>(this)->getASTContext(); |
1846 | } |
1847 | |
1848 | bool isClosure() const { return getDeclKind() == Decl::Block; } |
1849 | |
1850 | /// Return this DeclContext if it is a BlockDecl. Otherwise, return the |
1851 | /// innermost enclosing BlockDecl or null if there are no enclosing blocks. |
1852 | const BlockDecl *getInnermostBlockDecl() const; |
1853 | |
1854 | bool isObjCContainer() const { |
1855 | switch (getDeclKind()) { |
1856 | case Decl::ObjCCategory: |
1857 | case Decl::ObjCCategoryImpl: |
1858 | case Decl::ObjCImplementation: |
1859 | case Decl::ObjCInterface: |
1860 | case Decl::ObjCProtocol: |
1861 | return true; |
1862 | default: |
1863 | return false; |
1864 | } |
1865 | } |
1866 | |
1867 | bool isFunctionOrMethod() const { |
1868 | switch (getDeclKind()) { |
1869 | case Decl::Block: |
1870 | case Decl::Captured: |
1871 | case Decl::ObjCMethod: |
1872 | return true; |
1873 | default: |
1874 | return getDeclKind() >= Decl::firstFunction && |
1875 | getDeclKind() <= Decl::lastFunction; |
1876 | } |
1877 | } |
1878 | |
1879 | /// Test whether the context supports looking up names. |
1880 | bool isLookupContext() const { |
1881 | return !isFunctionOrMethod() && getDeclKind() != Decl::LinkageSpec && |
1882 | getDeclKind() != Decl::Export; |
1883 | } |
1884 | |
1885 | bool isFileContext() const { |
1886 | return getDeclKind() == Decl::TranslationUnit || |
1887 | getDeclKind() == Decl::Namespace; |
1888 | } |
1889 | |
1890 | bool isTranslationUnit() const { |
1891 | return getDeclKind() == Decl::TranslationUnit; |
1892 | } |
1893 | |
1894 | bool isRecord() const { |
1895 | return getDeclKind() >= Decl::firstRecord && |
1896 | getDeclKind() <= Decl::lastRecord; |
1897 | } |
1898 | |
1899 | bool isNamespace() const { return getDeclKind() == Decl::Namespace; } |
1900 | |
1901 | bool isStdNamespace() const; |
1902 | |
1903 | bool isInlineNamespace() const; |
1904 | |
1905 | /// Determines whether this context is dependent on a |
1906 | /// template parameter. |
1907 | bool isDependentContext() const; |
1908 | |
1909 | /// isTransparentContext - Determines whether this context is a |
1910 | /// "transparent" context, meaning that the members declared in this |
1911 | /// context are semantically declared in the nearest enclosing |
1912 | /// non-transparent (opaque) context but are lexically declared in |
1913 | /// this context. For example, consider the enumerators of an |
1914 | /// enumeration type: |
1915 | /// @code |
1916 | /// enum E { |
1917 | /// Val1 |
1918 | /// }; |
1919 | /// @endcode |
1920 | /// Here, E is a transparent context, so its enumerator (Val1) will |
1921 | /// appear (semantically) that it is in the same context of E. |
1922 | /// Examples of transparent contexts include: enumerations (except for |
1923 | /// C++0x scoped enums), and C++ linkage specifications. |
1924 | bool isTransparentContext() const; |
1925 | |
1926 | /// Determines whether this context or some of its ancestors is a |
1927 | /// linkage specification context that specifies C linkage. |
1928 | bool isExternCContext() const; |
1929 | |
1930 | /// Retrieve the nearest enclosing C linkage specification context. |
1931 | const LinkageSpecDecl *getExternCContext() const; |
1932 | |
1933 | /// Determines whether this context or some of its ancestors is a |
1934 | /// linkage specification context that specifies C++ linkage. |
1935 | bool isExternCXXContext() const; |
1936 | |
1937 | /// Determine whether this declaration context is equivalent |
1938 | /// to the declaration context DC. |
1939 | bool Equals(const DeclContext *DC) const { |
1940 | return DC && this->getPrimaryContext() == DC->getPrimaryContext(); |
1941 | } |
1942 | |
1943 | /// Determine whether this declaration context encloses the |
1944 | /// declaration context DC. |
1945 | bool Encloses(const DeclContext *DC) const; |
1946 | |
1947 | /// Find the nearest non-closure ancestor of this context, |
1948 | /// i.e. the innermost semantic parent of this context which is not |
1949 | /// a closure. A context may be its own non-closure ancestor. |
1950 | Decl *getNonClosureAncestor(); |
1951 | const Decl *getNonClosureAncestor() const { |
1952 | return const_cast<DeclContext*>(this)->getNonClosureAncestor(); |
1953 | } |
1954 | |
1955 | /// getPrimaryContext - There may be many different |
1956 | /// declarations of the same entity (including forward declarations |
1957 | /// of classes, multiple definitions of namespaces, etc.), each with |
1958 | /// a different set of declarations. This routine returns the |
1959 | /// "primary" DeclContext structure, which will contain the |
1960 | /// information needed to perform name lookup into this context. |
1961 | DeclContext *getPrimaryContext(); |
1962 | const DeclContext *getPrimaryContext() const { |
1963 | return const_cast<DeclContext*>(this)->getPrimaryContext(); |
1964 | } |
1965 | |
1966 | /// getRedeclContext - Retrieve the context in which an entity conflicts with |
1967 | /// other entities of the same name, or where it is a redeclaration if the |
1968 | /// two entities are compatible. This skips through transparent contexts. |
1969 | DeclContext *getRedeclContext(); |
1970 | const DeclContext *getRedeclContext() const { |
1971 | return const_cast<DeclContext *>(this)->getRedeclContext(); |
1972 | } |
1973 | |
1974 | /// Retrieve the nearest enclosing namespace context. |
1975 | DeclContext *getEnclosingNamespaceContext(); |
1976 | const DeclContext *getEnclosingNamespaceContext() const { |
1977 | return const_cast<DeclContext *>(this)->getEnclosingNamespaceContext(); |
1978 | } |
1979 | |
1980 | /// Retrieve the outermost lexically enclosing record context. |
1981 | RecordDecl *getOuterLexicalRecordContext(); |
1982 | const RecordDecl *getOuterLexicalRecordContext() const { |
1983 | return const_cast<DeclContext *>(this)->getOuterLexicalRecordContext(); |
1984 | } |
1985 | |
1986 | /// Test if this context is part of the enclosing namespace set of |
1987 | /// the context NS, as defined in C++0x [namespace.def]p9. If either context |
1988 | /// isn't a namespace, this is equivalent to Equals(). |
1989 | /// |
1990 | /// The enclosing namespace set of a namespace is the namespace and, if it is |
1991 | /// inline, its enclosing namespace, recursively. |
1992 | bool InEnclosingNamespaceSetOf(const DeclContext *NS) const; |
1993 | |
1994 | /// Collects all of the declaration contexts that are semantically |
1995 | /// connected to this declaration context. |
1996 | /// |
1997 | /// For declaration contexts that have multiple semantically connected but |
1998 | /// syntactically distinct contexts, such as C++ namespaces, this routine |
1999 | /// retrieves the complete set of such declaration contexts in source order. |
2000 | /// For example, given: |
2001 | /// |
2002 | /// \code |
2003 | /// namespace N { |
2004 | /// int x; |
2005 | /// } |
2006 | /// namespace N { |
2007 | /// int y; |
2008 | /// } |
2009 | /// \endcode |
2010 | /// |
2011 | /// The \c Contexts parameter will contain both definitions of N. |
2012 | /// |
2013 | /// \param Contexts Will be cleared and set to the set of declaration |
2014 | /// contexts that are semanticaly connected to this declaration context, |
2015 | /// in source order, including this context (which may be the only result, |
2016 | /// for non-namespace contexts). |
2017 | void collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts); |
2018 | |
2019 | /// decl_iterator - Iterates through the declarations stored |
2020 | /// within this context. |
2021 | class decl_iterator { |
2022 | /// Current - The current declaration. |
2023 | Decl *Current = nullptr; |
2024 | |
2025 | public: |
2026 | using value_type = Decl *; |
2027 | using reference = const value_type &; |
2028 | using pointer = const value_type *; |
2029 | using iterator_category = std::forward_iterator_tag; |
2030 | using difference_type = std::ptrdiff_t; |
2031 | |
2032 | decl_iterator() = default; |
2033 | explicit decl_iterator(Decl *C) : Current(C) {} |
2034 | |
2035 | reference operator*() const { return Current; } |
2036 | |
2037 | // This doesn't meet the iterator requirements, but it's convenient |
2038 | value_type operator->() const { return Current; } |
2039 | |
2040 | decl_iterator& operator++() { |
2041 | Current = Current->getNextDeclInContext(); |
2042 | return *this; |
2043 | } |
2044 | |
2045 | decl_iterator operator++(int) { |
2046 | decl_iterator tmp(*this); |
2047 | ++(*this); |
2048 | return tmp; |
2049 | } |
2050 | |
2051 | friend bool operator==(decl_iterator x, decl_iterator y) { |
2052 | return x.Current == y.Current; |
2053 | } |
2054 | |
2055 | friend bool operator!=(decl_iterator x, decl_iterator y) { |
2056 | return x.Current != y.Current; |
2057 | } |
2058 | }; |
2059 | |
2060 | using decl_range = llvm::iterator_range<decl_iterator>; |
2061 | |
2062 | /// decls_begin/decls_end - Iterate over the declarations stored in |
2063 | /// this context. |
2064 | decl_range decls() const { return decl_range(decls_begin(), decls_end()); } |
2065 | decl_iterator decls_begin() const; |
2066 | decl_iterator decls_end() const { return decl_iterator(); } |
2067 | bool decls_empty() const; |
2068 | |
2069 | /// noload_decls_begin/end - Iterate over the declarations stored in this |
2070 | /// context that are currently loaded; don't attempt to retrieve anything |
2071 | /// from an external source. |
2072 | decl_range noload_decls() const { |
2073 | return decl_range(noload_decls_begin(), noload_decls_end()); |
2074 | } |
2075 | decl_iterator noload_decls_begin() const { return decl_iterator(FirstDecl); } |
2076 | decl_iterator noload_decls_end() const { return decl_iterator(); } |
2077 | |
2078 | /// specific_decl_iterator - Iterates over a subrange of |
2079 | /// declarations stored in a DeclContext, providing only those that |
2080 | /// are of type SpecificDecl (or a class derived from it). This |
2081 | /// iterator is used, for example, to provide iteration over just |
2082 | /// the fields within a RecordDecl (with SpecificDecl = FieldDecl). |
2083 | template<typename SpecificDecl> |
2084 | class specific_decl_iterator { |
2085 | /// Current - The current, underlying declaration iterator, which |
2086 | /// will either be NULL or will point to a declaration of |
2087 | /// type SpecificDecl. |
2088 | DeclContext::decl_iterator Current; |
2089 | |
2090 | /// SkipToNextDecl - Advances the current position up to the next |
2091 | /// declaration of type SpecificDecl that also meets the criteria |
2092 | /// required by Acceptable. |
2093 | void SkipToNextDecl() { |
2094 | while (*Current && !isa<SpecificDecl>(*Current)) |
2095 | ++Current; |
2096 | } |
2097 | |
2098 | public: |
2099 | using value_type = SpecificDecl *; |
2100 | // TODO: Add reference and pointer types (with some appropriate proxy type) |
2101 | // if we ever have a need for them. |
2102 | using reference = void; |
2103 | using pointer = void; |
2104 | using difference_type = |
2105 | std::iterator_traits<DeclContext::decl_iterator>::difference_type; |
2106 | using iterator_category = std::forward_iterator_tag; |
2107 | |
2108 | specific_decl_iterator() = default; |
2109 | |
2110 | /// specific_decl_iterator - Construct a new iterator over a |
2111 | /// subset of the declarations the range [C, |
2112 | /// end-of-declarations). If A is non-NULL, it is a pointer to a |
2113 | /// member function of SpecificDecl that should return true for |
2114 | /// all of the SpecificDecl instances that will be in the subset |
2115 | /// of iterators. For example, if you want Objective-C instance |
2116 | /// methods, SpecificDecl will be ObjCMethodDecl and A will be |
2117 | /// &ObjCMethodDecl::isInstanceMethod. |
2118 | explicit specific_decl_iterator(DeclContext::decl_iterator C) : Current(C) { |
2119 | SkipToNextDecl(); |
2120 | } |
2121 | |
2122 | value_type operator*() const { return cast<SpecificDecl>(*Current); } |
2123 | |
2124 | // This doesn't meet the iterator requirements, but it's convenient |
2125 | value_type operator->() const { return **this; } |
2126 | |
2127 | specific_decl_iterator& operator++() { |
2128 | ++Current; |
2129 | SkipToNextDecl(); |
2130 | return *this; |
2131 | } |
2132 | |
2133 | specific_decl_iterator operator++(int) { |
2134 | specific_decl_iterator tmp(*this); |
2135 | ++(*this); |
2136 | return tmp; |
2137 | } |
2138 | |
2139 | friend bool operator==(const specific_decl_iterator& x, |
2140 | const specific_decl_iterator& y) { |
2141 | return x.Current == y.Current; |
2142 | } |
2143 | |
2144 | friend bool operator!=(const specific_decl_iterator& x, |
2145 | const specific_decl_iterator& y) { |
2146 | return x.Current != y.Current; |
2147 | } |
2148 | }; |
2149 | |
2150 | /// Iterates over a filtered subrange of declarations stored |
2151 | /// in a DeclContext. |
2152 | /// |
2153 | /// This iterator visits only those declarations that are of type |
2154 | /// SpecificDecl (or a class derived from it) and that meet some |
2155 | /// additional run-time criteria. This iterator is used, for |
2156 | /// example, to provide access to the instance methods within an |
2157 | /// Objective-C interface (with SpecificDecl = ObjCMethodDecl and |
2158 | /// Acceptable = ObjCMethodDecl::isInstanceMethod). |
2159 | template<typename SpecificDecl, bool (SpecificDecl::*Acceptable)() const> |
2160 | class filtered_decl_iterator { |
2161 | /// Current - The current, underlying declaration iterator, which |
2162 | /// will either be NULL or will point to a declaration of |
2163 | /// type SpecificDecl. |
2164 | DeclContext::decl_iterator Current; |
2165 | |
2166 | /// SkipToNextDecl - Advances the current position up to the next |
2167 | /// declaration of type SpecificDecl that also meets the criteria |
2168 | /// required by Acceptable. |
2169 | void SkipToNextDecl() { |
2170 | while (*Current && |
2171 | (!isa<SpecificDecl>(*Current) || |
2172 | (Acceptable && !(cast<SpecificDecl>(*Current)->*Acceptable)()))) |
2173 | ++Current; |
2174 | } |
2175 | |
2176 | public: |
2177 | using value_type = SpecificDecl *; |
2178 | // TODO: Add reference and pointer types (with some appropriate proxy type) |
2179 | // if we ever have a need for them. |
2180 | using reference = void; |
2181 | using pointer = void; |
2182 | using difference_type = |
2183 | std::iterator_traits<DeclContext::decl_iterator>::difference_type; |
2184 | using iterator_category = std::forward_iterator_tag; |
2185 | |
2186 | filtered_decl_iterator() = default; |
2187 | |
2188 | /// filtered_decl_iterator - Construct a new iterator over a |
2189 | /// subset of the declarations the range [C, |
2190 | /// end-of-declarations). If A is non-NULL, it is a pointer to a |
2191 | /// member function of SpecificDecl that should return true for |
2192 | /// all of the SpecificDecl instances that will be in the subset |
2193 | /// of iterators. For example, if you want Objective-C instance |
2194 | /// methods, SpecificDecl will be ObjCMethodDecl and A will be |
2195 | /// &ObjCMethodDecl::isInstanceMethod. |
2196 | explicit filtered_decl_iterator(DeclContext::decl_iterator C) : Current(C) { |
2197 | SkipToNextDecl(); |
2198 | } |
2199 | |
2200 | value_type operator*() const { return cast<SpecificDecl>(*Current); } |
2201 | value_type operator->() const { return cast<SpecificDecl>(*Current); } |
2202 | |
2203 | filtered_decl_iterator& operator++() { |
2204 | ++Current; |
2205 | SkipToNextDecl(); |
2206 | return *this; |
2207 | } |
2208 | |
2209 | filtered_decl_iterator operator++(int) { |
2210 | filtered_decl_iterator tmp(*this); |
2211 | ++(*this); |
2212 | return tmp; |
2213 | } |
2214 | |
2215 | friend bool operator==(const filtered_decl_iterator& x, |
2216 | const filtered_decl_iterator& y) { |
2217 | return x.Current == y.Current; |
2218 | } |
2219 | |
2220 | friend bool operator!=(const filtered_decl_iterator& x, |
2221 | const filtered_decl_iterator& y) { |
2222 | return x.Current != y.Current; |
2223 | } |
2224 | }; |
2225 | |
2226 | /// Add the declaration D into this context. |
2227 | /// |
2228 | /// This routine should be invoked when the declaration D has first |
2229 | /// been declared, to place D into the context where it was |
2230 | /// (lexically) defined. Every declaration must be added to one |
2231 | /// (and only one!) context, where it can be visited via |
2232 | /// [decls_begin(), decls_end()). Once a declaration has been added |
2233 | /// to its lexical context, the corresponding DeclContext owns the |
2234 | /// declaration. |
2235 | /// |
2236 | /// If D is also a NamedDecl, it will be made visible within its |
2237 | /// semantic context via makeDeclVisibleInContext. |
2238 | void addDecl(Decl *D); |
2239 | |
2240 | /// Add the declaration D into this context, but suppress |
2241 | /// searches for external declarations with the same name. |
2242 | /// |
2243 | /// Although analogous in function to addDecl, this removes an |
2244 | /// important check. This is only useful if the Decl is being |
2245 | /// added in response to an external search; in all other cases, |
2246 | /// addDecl() is the right function to use. |
2247 | /// See the ASTImporter for use cases. |
2248 | void addDeclInternal(Decl *D); |
2249 | |
2250 | /// Add the declaration D to this context without modifying |
2251 | /// any lookup tables. |
2252 | /// |
2253 | /// This is useful for some operations in dependent contexts where |
2254 | /// the semantic context might not be dependent; this basically |
2255 | /// only happens with friends. |
2256 | void addHiddenDecl(Decl *D); |
2257 | |
2258 | /// Removes a declaration from this context. |
2259 | void removeDecl(Decl *D); |
2260 | |
2261 | /// Checks whether a declaration is in this context. |
2262 | bool containsDecl(Decl *D) const; |
2263 | |
2264 | /// Checks whether a declaration is in this context. |
2265 | /// This also loads the Decls from the external source before the check. |
2266 | bool containsDeclAndLoad(Decl *D) const; |
2267 | |
2268 | using lookup_result = DeclContextLookupResult; |
2269 | using lookup_iterator = lookup_result::iterator; |
2270 | |
2271 | /// lookup - Find the declarations (if any) with the given Name in |
2272 | /// this context. Returns a range of iterators that contains all of |
2273 | /// the declarations with this name, with object, function, member, |
2274 | /// and enumerator names preceding any tag name. Note that this |
2275 | /// routine will not look into parent contexts. |
2276 | lookup_result lookup(DeclarationName Name) const; |
2277 | |
2278 | /// Find the declarations with the given name that are visible |
2279 | /// within this context; don't attempt to retrieve anything from an |
2280 | /// external source. |
2281 | lookup_result noload_lookup(DeclarationName Name); |
2282 | |
2283 | /// A simplistic name lookup mechanism that performs name lookup |
2284 | /// into this declaration context without consulting the external source. |
2285 | /// |
2286 | /// This function should almost never be used, because it subverts the |
2287 | /// usual relationship between a DeclContext and the external source. |
2288 | /// See the ASTImporter for the (few, but important) use cases. |
2289 | /// |
2290 | /// FIXME: This is very inefficient; replace uses of it with uses of |
2291 | /// noload_lookup. |
2292 | void localUncachedLookup(DeclarationName Name, |
2293 | SmallVectorImpl<NamedDecl *> &Results); |
2294 | |
2295 | /// Makes a declaration visible within this context. |
2296 | /// |
2297 | /// This routine makes the declaration D visible to name lookup |
2298 | /// within this context and, if this is a transparent context, |
2299 | /// within its parent contexts up to the first enclosing |
2300 | /// non-transparent context. Making a declaration visible within a |
2301 | /// context does not transfer ownership of a declaration, and a |
2302 | /// declaration can be visible in many contexts that aren't its |
2303 | /// lexical context. |
2304 | /// |
2305 | /// If D is a redeclaration of an existing declaration that is |
2306 | /// visible from this context, as determined by |
2307 | /// NamedDecl::declarationReplaces, the previous declaration will be |
2308 | /// replaced with D. |
2309 | void makeDeclVisibleInContext(NamedDecl *D); |
2310 | |
2311 | /// all_lookups_iterator - An iterator that provides a view over the results |
2312 | /// of looking up every possible name. |
2313 | class all_lookups_iterator; |
2314 | |
2315 | using lookups_range = llvm::iterator_range<all_lookups_iterator>; |
2316 | |
2317 | lookups_range lookups() const; |
2318 | // Like lookups(), but avoids loading external declarations. |
2319 | // If PreserveInternalState, avoids building lookup data structures too. |
2320 | lookups_range noload_lookups(bool PreserveInternalState) const; |
2321 | |
2322 | /// Iterators over all possible lookups within this context. |
2323 | all_lookups_iterator lookups_begin() const; |
2324 | all_lookups_iterator lookups_end() const; |
2325 | |
2326 | /// Iterators over all possible lookups within this context that are |
2327 | /// currently loaded; don't attempt to retrieve anything from an external |
2328 | /// source. |
2329 | all_lookups_iterator noload_lookups_begin() const; |
2330 | all_lookups_iterator noload_lookups_end() const; |
2331 | |
2332 | struct udir_iterator; |
2333 | |
2334 | using udir_iterator_base = |
2335 | llvm::iterator_adaptor_base<udir_iterator, lookup_iterator, |
2336 | std::random_access_iterator_tag, |
2337 | UsingDirectiveDecl *>; |
2338 | |
2339 | struct udir_iterator : udir_iterator_base { |
2340 | udir_iterator(lookup_iterator I) : udir_iterator_base(I) {} |
2341 | |
2342 | UsingDirectiveDecl *operator*() const; |
2343 | }; |
2344 | |
2345 | using udir_range = llvm::iterator_range<udir_iterator>; |
2346 | |
2347 | udir_range using_directives() const; |
2348 | |
2349 | // These are all defined in DependentDiagnostic.h. |
2350 | class ddiag_iterator; |
2351 | |
2352 | using ddiag_range = llvm::iterator_range<DeclContext::ddiag_iterator>; |
2353 | |
2354 | inline ddiag_range ddiags() const; |
2355 | |
2356 | // Low-level accessors |
2357 | |
2358 | /// Mark that there are external lexical declarations that we need |
2359 | /// to include in our lookup table (and that are not available as external |
2360 | /// visible lookups). These extra lookup results will be found by walking |
2361 | /// the lexical declarations of this context. This should be used only if |
2362 | /// setHasExternalLexicalStorage() has been called on any decl context for |
2363 | /// which this is the primary context. |
2364 | void setMustBuildLookupTable() { |
2365 | assert(this == getPrimaryContext() &&((this == getPrimaryContext() && "should only be called on primary context" ) ? static_cast<void> (0) : __assert_fail ("this == getPrimaryContext() && \"should only be called on primary context\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 2366, __PRETTY_FUNCTION__)) |
2366 | "should only be called on primary context")((this == getPrimaryContext() && "should only be called on primary context" ) ? static_cast<void> (0) : __assert_fail ("this == getPrimaryContext() && \"should only be called on primary context\"" , "/build/llvm-toolchain-snapshot-12~++20210122100613+fdab28edef35/clang/include/clang/AST/DeclBase.h" , 2366, __PRETTY_FUNCTION__)); |
2367 | DeclContextBits.HasLazyExternalLexicalLookups = true; |
2368 | } |
2369 | |
2370 | /// Retrieve the internal representation of the lookup structure. |
2371 | /// This may omit some names if we are lazily building the structure. |
2372 | StoredDeclsMap *getLookupPtr() const { return LookupPtr; } |
2373 | |
2374 | /// Ensure the lookup structure is fully-built and return it. |
2375 | StoredDeclsMap *buildLookup(); |
2376 | |
2377 | /// Whether this DeclContext has external storage containing |
2378 | /// additional declarations that are lexically in this context. |
2379 | bool hasExternalLexicalStorage() const { |
2380 | return DeclContextBits.ExternalLexicalStorage; |
2381 | } |
2382 | |
2383 | /// State whether this DeclContext has external storage for |
2384 | /// declarations lexically in this context. |
2385 | void setHasExternalLexicalStorage(bool ES = true) const { |
2386 | DeclContextBits.ExternalLexicalStorage = ES; |
2387 | } |
2388 | |
2389 | /// Whether this DeclContext has external storage containing |
2390 | /// additional declarations that are visible in this context. |
2391 | bool hasExternalVisibleStorage() const { |
2392 | return DeclContextBits.ExternalVisibleStorage; |
2393 | } |
2394 | |
2395 | /// State whether this DeclContext has external storage for |
2396 | /// declarations visible in this context. |
2397 | void setHasExternalVisibleStorage(bool ES = true) const { |
2398 | DeclContextBits.ExternalVisibleStorage = ES; |
2399 | if (ES && LookupPtr) |
2400 | DeclContextBits.NeedToReconcileExternalVisibleStorage = true; |
2401 | } |
2402 | |
2403 | /// Determine whether the given declaration is stored in the list of |
2404 | /// declarations lexically within this context. |
2405 | bool isDeclInLexicalTraversal(const Decl *D) const { |
2406 | return D && (D->NextInContextAndBits.getPointer() || D == FirstDecl || |
2407 | D == LastDecl); |
2408 | } |
2409 | |
2410 | bool setUseQualifiedLookup(bool use = true) const { |
2411 | bool old_value = DeclContextBits.UseQualifiedLookup; |
2412 | DeclContextBits.UseQualifiedLookup = use; |
2413 | return old_value; |
2414 | } |
2415 | |
2416 | bool shouldUseQualifiedLookup() const { |
2417 | return DeclContextBits.UseQualifiedLookup; |
2418 | } |
2419 | |
2420 | static bool classof(const Decl *D); |
2421 | static bool classof(const DeclContext *D) { return true; } |
2422 | |
2423 | void dumpDeclContext() const; |
2424 | void dumpLookups() const; |
2425 | void dumpLookups(llvm::raw_ostream &OS, bool DumpDecls = false, |
2426 | bool Deserialize = false) const; |
2427 | |
2428 | private: |
2429 | /// Whether this declaration context has had externally visible |
2430 | /// storage added since the last lookup. In this case, \c LookupPtr's |
2431 | /// invariant may not hold and needs to be fixed before we perform |
2432 | /// another lookup. |
2433 | bool hasNeedToReconcileExternalVisibleStorage() const { |
2434 | return DeclContextBits.NeedToReconcileExternalVisibleStorage; |
2435 | } |
2436 | |
2437 | /// State that this declaration context has had externally visible |
2438 | /// storage added since the last lookup. In this case, \c LookupPtr's |
2439 | /// invariant may not hold and needs to be fixed before we perform |
2440 | /// another lookup. |
2441 | void setNeedToReconcileExternalVisibleStorage(bool Need = true) const { |
2442 | DeclContextBits.NeedToReconcileExternalVisibleStorage = Need; |
2443 | } |
2444 | |
2445 | /// If \c true, this context may have local lexical declarations |
2446 | /// that are missing from the lookup table. |
2447 | bool hasLazyLocalLexicalLookups() const { |
2448 | return DeclContextBits.HasLazyLocalLexicalLookups; |
2449 | } |
2450 | |
2451 | /// If \c true, this context may have local lexical declarations |
2452 | /// that are missing from the lookup table. |
2453 | void setHasLazyLocalLexicalLookups(bool HasLLLL = true) const { |
2454 | DeclContextBits.HasLazyLocalLexicalLookups = HasLLLL; |
2455 | } |
2456 | |
2457 | /// If \c true, the external source may have lexical declarations |
2458 | /// that are missing from the lookup table. |
2459 | bool hasLazyExternalLexicalLookups() const { |
2460 | return DeclContextBits.HasLazyExternalLexicalLookups; |
2461 | } |
2462 | |
2463 | /// If \c true, the external source may have lexical declarations |
2464 | /// that are missing from the lookup table. |
2465 | void setHasLazyExternalLexicalLookups(bool HasLELL = true) const { |
2466 | DeclContextBits.HasLazyExternalLexicalLookups = HasLELL; |
2467 | } |
2468 | |
2469 | void reconcileExternalVisibleStorage() const; |
2470 | bool LoadLexicalDeclsFromExternalStorage() const; |
2471 | |
2472 | /// Makes a declaration visible within this context, but |
2473 | /// suppresses searches for external declarations with the same |
2474 | /// name. |
2475 | /// |
2476 | /// Analogous to makeDeclVisibleInContext, but for the exclusive |
2477 | /// use of addDeclInternal(). |
2478 | void makeDeclVisibleInContextInternal(NamedDecl *D); |
2479 | |
2480 | StoredDeclsMap *CreateStoredDeclsMap(ASTContext &C) const; |
2481 | |
2482 | void loadLazyLocalLexicalLookups(); |
2483 | void buildLookupImpl(DeclContext *DCtx, bool Internal); |
2484 | void makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal, |
2485 | bool Rediscoverable); |
2486 | void makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal); |
2487 | }; |
2488 | |
2489 | inline bool Decl::isTemplateParameter() const { |
2490 | return getKind() == TemplateTypeParm || getKind() == NonTypeTemplateParm || |
2491 | getKind() == TemplateTemplateParm; |
2492 | } |
2493 | |
2494 | // Specialization selected when ToTy is not a known subclass of DeclContext. |
2495 | template <class ToTy, |
2496 | bool IsKnownSubtype = ::std::is_base_of<DeclContext, ToTy>::value> |
2497 | struct cast_convert_decl_context { |
2498 | static const ToTy *doit(const DeclContext *Val) { |
2499 | return static_cast<const ToTy*>(Decl::castFromDeclContext(Val)); |
2500 | } |
2501 | |
2502 | static ToTy *doit(DeclContext *Val) { |
2503 | return static_cast<ToTy*>(Decl::castFromDeclContext(Val)); |
2504 | } |
2505 | }; |
2506 | |
2507 | // Specialization selected when ToTy is a known subclass of DeclContext. |
2508 | template <class ToTy> |
2509 | struct cast_convert_decl_context<ToTy, true> { |
2510 | static const ToTy *doit(const DeclContext *Val) { |
2511 | return static_cast<const ToTy*>(Val); |
2512 | } |
2513 | |
2514 | static ToTy *doit(DeclContext *Val) { |
2515 | return static_cast<ToTy*>(Val); |
2516 | } |
2517 | }; |
2518 | |
2519 | } // namespace clang |
2520 | |
2521 | namespace llvm { |
2522 | |
2523 | /// isa<T>(DeclContext*) |
2524 | template <typename To> |
2525 | struct isa_impl<To, ::clang::DeclContext> { |
2526 | static bool doit(const ::clang::DeclContext &Val) { |
2527 | return To::classofKind(Val.getDeclKind()); |
2528 | } |
2529 | }; |
2530 | |
2531 | /// cast<T>(DeclContext*) |
2532 | template<class ToTy> |
2533 | struct cast_convert_val<ToTy, |
2534 | const ::clang::DeclContext,const ::clang::DeclContext> { |
2535 | static const ToTy &doit(const ::clang::DeclContext &Val) { |
2536 | return *::clang::cast_convert_decl_context<ToTy>::doit(&Val); |
2537 | } |
2538 | }; |
2539 | |
2540 | template<class ToTy> |
2541 | struct cast_convert_val<ToTy, ::clang::DeclContext, ::clang::DeclContext> { |
2542 | static ToTy &doit(::clang::DeclContext &Val) { |
2543 | return *::clang::cast_convert_decl_context<ToTy>::doit(&Val); |
2544 | } |
2545 | }; |
2546 | |
2547 | template<class ToTy> |
2548 | struct cast_convert_val<ToTy, |
2549 | const ::clang::DeclContext*, const ::clang::DeclContext*> { |
2550 | static const ToTy *doit(const ::clang::DeclContext *Val) { |
2551 | return ::clang::cast_convert_decl_context<ToTy>::doit(Val); |
2552 | } |
2553 | }; |
2554 | |
2555 | template<class ToTy> |
2556 | struct cast_convert_val<ToTy, ::clang::DeclContext*, ::clang::DeclContext*> { |
2557 | static ToTy *doit(::clang::DeclContext *Val) { |
2558 | return ::clang::cast_convert_decl_context<ToTy>::doit(Val); |
2559 | } |
2560 | }; |
2561 | |
2562 | /// Implement cast_convert_val for Decl -> DeclContext conversions. |
2563 | template<class FromTy> |
2564 | struct cast_convert_val< ::clang::DeclContext, FromTy, FromTy> { |
2565 | static ::clang::DeclContext &doit(const FromTy &Val) { |
2566 | return *FromTy::castToDeclContext(&Val); |
2567 | } |
2568 | }; |
2569 | |
2570 | template<class FromTy> |
2571 | struct cast_convert_val< ::clang::DeclContext, FromTy*, FromTy*> { |
2572 | static ::clang::DeclContext *doit(const FromTy *Val) { |
2573 | return FromTy::castToDeclContext(Val); |
2574 | } |
2575 | }; |
2576 | |
2577 | template<class FromTy> |
2578 | struct cast_convert_val< const ::clang::DeclContext, FromTy, FromTy> { |
2579 | static const ::clang::DeclContext &doit(const FromTy &Val) { |
2580 | return *FromTy::castToDeclContext(&Val); |
2581 | } |
2582 | }; |
2583 | |
2584 | template<class FromTy> |
2585 | struct cast_convert_val< const ::clang::DeclContext, FromTy*, FromTy*> { |
2586 | static const ::clang::DeclContext *doit(const FromTy *Val) { |
2587 | return FromTy::castToDeclContext(Val); |
2588 | } |
2589 | }; |
2590 | |
2591 | } // namespace llvm |
2592 | |
2593 | #endif // LLVM_CLANG_AST_DECLBASE_H |