1 //===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements semantic analysis for declarations. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "clang/Sema/SemaInternal.h" 15 #include "TypeLocBuilder.h" 16 #include "clang/AST/ASTConsumer.h" 17 #include "clang/AST/ASTContext.h" 18 #include "clang/AST/CXXInheritance.h" 19 #include "clang/AST/CharUnits.h" 20 #include "clang/AST/CommentDiagnostic.h" 21 #include "clang/AST/DeclCXX.h" 22 #include "clang/AST/DeclObjC.h" 23 #include "clang/AST/DeclTemplate.h" 24 #include "clang/AST/EvaluatedExprVisitor.h" 25 #include "clang/AST/ExprCXX.h" 26 #include "clang/AST/StmtCXX.h" 27 #include "clang/Basic/PartialDiagnostic.h" 28 #include "clang/Basic/SourceManager.h" 29 #include "clang/Basic/TargetInfo.h" 30 #include "clang/Lex/HeaderSearch.h" // FIXME: Sema shouldn't depend on Lex 31 #include "clang/Lex/ModuleLoader.h" // FIXME: Sema shouldn't depend on Lex 32 #include "clang/Lex/Preprocessor.h" // FIXME: Sema shouldn't depend on Lex 33 #include "clang/Parse/ParseDiagnostic.h" 34 #include "clang/Sema/CXXFieldCollector.h" 35 #include "clang/Sema/DeclSpec.h" 36 #include "clang/Sema/DelayedDiagnostic.h" 37 #include "clang/Sema/Initialization.h" 38 #include "clang/Sema/Lookup.h" 39 #include "clang/Sema/ParsedTemplate.h" 40 #include "clang/Sema/Scope.h" 41 #include "clang/Sema/ScopeInfo.h" 42 #include "llvm/ADT/SmallString.h" 43 #include "llvm/ADT/Triple.h" 44 #include <algorithm> 45 #include <cstring> 46 #include <functional> 47 using namespace clang; 48 using namespace sema; 49 50 Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 51 if (OwnedType) { 52 Decl *Group[2] = { OwnedType, Ptr }; 53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 54 } 55 56 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 57 } 58 59 namespace { 60 61 class TypeNameValidatorCCC : public CorrectionCandidateCallback { 62 public: 63 TypeNameValidatorCCC(bool AllowInvalid, bool WantClass=false) 64 : AllowInvalidDecl(AllowInvalid), WantClassName(WantClass) { 65 WantExpressionKeywords = false; 66 WantCXXNamedCasts = false; 67 WantRemainingKeywords = false; 68 } 69 70 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 71 if (NamedDecl *ND = candidate.getCorrectionDecl()) 72 return (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) && 73 (AllowInvalidDecl || !ND->isInvalidDecl()); 74 else 75 return !WantClassName && candidate.isKeyword(); 76 } 77 78 private: 79 bool AllowInvalidDecl; 80 bool WantClassName; 81 }; 82 83 } 84 85 /// \brief Determine whether the token kind starts a simple-type-specifier. 86 bool Sema::isSimpleTypeSpecifier(tok::TokenKind Kind) const { 87 switch (Kind) { 88 // FIXME: Take into account the current language when deciding whether a 89 // token kind is a valid type specifier 90 case tok::kw_short: 91 case tok::kw_long: 92 case tok::kw___int64: 93 case tok::kw___int128: 94 case tok::kw_signed: 95 case tok::kw_unsigned: 96 case tok::kw_void: 97 case tok::kw_char: 98 case tok::kw_int: 99 case tok::kw_half: 100 case tok::kw_float: 101 case tok::kw_double: 102 case tok::kw_wchar_t: 103 case tok::kw_bool: 104 case tok::kw___underlying_type: 105 return true; 106 107 case tok::annot_typename: 108 case tok::kw_char16_t: 109 case tok::kw_char32_t: 110 case tok::kw_typeof: 111 case tok::kw_decltype: 112 return getLangOpts().CPlusPlus; 113 114 default: 115 break; 116 } 117 118 return false; 119 } 120 121 /// \brief If the identifier refers to a type name within this scope, 122 /// return the declaration of that type. 123 /// 124 /// This routine performs ordinary name lookup of the identifier II 125 /// within the given scope, with optional C++ scope specifier SS, to 126 /// determine whether the name refers to a type. If so, returns an 127 /// opaque pointer (actually a QualType) corresponding to that 128 /// type. Otherwise, returns NULL. 129 /// 130 /// If name lookup results in an ambiguity, this routine will complain 131 /// and then return NULL. 132 ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 133 Scope *S, CXXScopeSpec *SS, 134 bool isClassName, bool HasTrailingDot, 135 ParsedType ObjectTypePtr, 136 bool IsCtorOrDtorName, 137 bool WantNontrivialTypeSourceInfo, 138 IdentifierInfo **CorrectedII) { 139 // Determine where we will perform name lookup. 140 DeclContext *LookupCtx = 0; 141 if (ObjectTypePtr) { 142 QualType ObjectType = ObjectTypePtr.get(); 143 if (ObjectType->isRecordType()) 144 LookupCtx = computeDeclContext(ObjectType); 145 } else if (SS && SS->isNotEmpty()) { 146 LookupCtx = computeDeclContext(*SS, false); 147 148 if (!LookupCtx) { 149 if (isDependentScopeSpecifier(*SS)) { 150 // C++ [temp.res]p3: 151 // A qualified-id that refers to a type and in which the 152 // nested-name-specifier depends on a template-parameter (14.6.2) 153 // shall be prefixed by the keyword typename to indicate that the 154 // qualified-id denotes a type, forming an 155 // elaborated-type-specifier (7.1.5.3). 156 // 157 // We therefore do not perform any name lookup if the result would 158 // refer to a member of an unknown specialization. 159 if (!isClassName && !IsCtorOrDtorName) 160 return ParsedType(); 161 162 // We know from the grammar that this name refers to a type, 163 // so build a dependent node to describe the type. 164 if (WantNontrivialTypeSourceInfo) 165 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 166 167 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 168 QualType T = 169 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 170 II, NameLoc); 171 172 return ParsedType::make(T); 173 } 174 175 return ParsedType(); 176 } 177 178 if (!LookupCtx->isDependentContext() && 179 RequireCompleteDeclContext(*SS, LookupCtx)) 180 return ParsedType(); 181 } 182 183 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 184 // lookup for class-names. 185 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 186 LookupOrdinaryName; 187 LookupResult Result(*this, &II, NameLoc, Kind); 188 if (LookupCtx) { 189 // Perform "qualified" name lookup into the declaration context we 190 // computed, which is either the type of the base of a member access 191 // expression or the declaration context associated with a prior 192 // nested-name-specifier. 193 LookupQualifiedName(Result, LookupCtx); 194 195 if (ObjectTypePtr && Result.empty()) { 196 // C++ [basic.lookup.classref]p3: 197 // If the unqualified-id is ~type-name, the type-name is looked up 198 // in the context of the entire postfix-expression. If the type T of 199 // the object expression is of a class type C, the type-name is also 200 // looked up in the scope of class C. At least one of the lookups shall 201 // find a name that refers to (possibly cv-qualified) T. 202 LookupName(Result, S); 203 } 204 } else { 205 // Perform unqualified name lookup. 206 LookupName(Result, S); 207 } 208 209 NamedDecl *IIDecl = 0; 210 switch (Result.getResultKind()) { 211 case LookupResult::NotFound: 212 case LookupResult::NotFoundInCurrentInstantiation: 213 if (CorrectedII) { 214 TypeNameValidatorCCC Validator(true, isClassName); 215 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 216 Kind, S, SS, Validator); 217 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 218 TemplateTy Template; 219 bool MemberOfUnknownSpecialization; 220 UnqualifiedId TemplateName; 221 TemplateName.setIdentifier(NewII, NameLoc); 222 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 223 CXXScopeSpec NewSS, *NewSSPtr = SS; 224 if (SS && NNS) { 225 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 226 NewSSPtr = &NewSS; 227 } 228 if (Correction && (NNS || NewII != &II) && 229 // Ignore a correction to a template type as the to-be-corrected 230 // identifier is not a template (typo correction for template names 231 // is handled elsewhere). 232 !(getLangOpts().CPlusPlus && NewSSPtr && 233 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 234 false, Template, MemberOfUnknownSpecialization))) { 235 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 236 isClassName, HasTrailingDot, ObjectTypePtr, 237 IsCtorOrDtorName, 238 WantNontrivialTypeSourceInfo); 239 if (Ty) { 240 std::string CorrectedStr(Correction.getAsString(getLangOpts())); 241 std::string CorrectedQuotedStr( 242 Correction.getQuoted(getLangOpts())); 243 Diag(NameLoc, diag::err_unknown_type_or_class_name_suggest) 244 << Result.getLookupName() << CorrectedQuotedStr << isClassName 245 << FixItHint::CreateReplacement(SourceRange(NameLoc), 246 CorrectedStr); 247 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 248 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 249 << CorrectedQuotedStr; 250 251 if (SS && NNS) 252 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 253 *CorrectedII = NewII; 254 return Ty; 255 } 256 } 257 } 258 // If typo correction failed or was not performed, fall through 259 case LookupResult::FoundOverloaded: 260 case LookupResult::FoundUnresolvedValue: 261 Result.suppressDiagnostics(); 262 return ParsedType(); 263 264 case LookupResult::Ambiguous: 265 // Recover from type-hiding ambiguities by hiding the type. We'll 266 // do the lookup again when looking for an object, and we can 267 // diagnose the error then. If we don't do this, then the error 268 // about hiding the type will be immediately followed by an error 269 // that only makes sense if the identifier was treated like a type. 270 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 271 Result.suppressDiagnostics(); 272 return ParsedType(); 273 } 274 275 // Look to see if we have a type anywhere in the list of results. 276 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 277 Res != ResEnd; ++Res) { 278 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 279 if (!IIDecl || 280 (*Res)->getLocation().getRawEncoding() < 281 IIDecl->getLocation().getRawEncoding()) 282 IIDecl = *Res; 283 } 284 } 285 286 if (!IIDecl) { 287 // None of the entities we found is a type, so there is no way 288 // to even assume that the result is a type. In this case, don't 289 // complain about the ambiguity. The parser will either try to 290 // perform this lookup again (e.g., as an object name), which 291 // will produce the ambiguity, or will complain that it expected 292 // a type name. 293 Result.suppressDiagnostics(); 294 return ParsedType(); 295 } 296 297 // We found a type within the ambiguous lookup; diagnose the 298 // ambiguity and then return that type. This might be the right 299 // answer, or it might not be, but it suppresses any attempt to 300 // perform the name lookup again. 301 break; 302 303 case LookupResult::Found: 304 IIDecl = Result.getFoundDecl(); 305 break; 306 } 307 308 assert(IIDecl && "Didn't find decl"); 309 310 QualType T; 311 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 312 DiagnoseUseOfDecl(IIDecl, NameLoc); 313 314 if (T.isNull()) 315 T = Context.getTypeDeclType(TD); 316 317 // NOTE: avoid constructing an ElaboratedType(Loc) if this is a 318 // constructor or destructor name (in such a case, the scope specifier 319 // will be attached to the enclosing Expr or Decl node). 320 if (SS && SS->isNotEmpty() && !IsCtorOrDtorName) { 321 if (WantNontrivialTypeSourceInfo) { 322 // Construct a type with type-source information. 323 TypeLocBuilder Builder; 324 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 325 326 T = getElaboratedType(ETK_None, *SS, T); 327 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 328 ElabTL.setElaboratedKeywordLoc(SourceLocation()); 329 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 330 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 331 } else { 332 T = getElaboratedType(ETK_None, *SS, T); 333 } 334 } 335 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 336 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 337 if (!HasTrailingDot) 338 T = Context.getObjCInterfaceType(IDecl); 339 } 340 341 if (T.isNull()) { 342 // If it's not plausibly a type, suppress diagnostics. 343 Result.suppressDiagnostics(); 344 return ParsedType(); 345 } 346 return ParsedType::make(T); 347 } 348 349 /// isTagName() - This method is called *for error recovery purposes only* 350 /// to determine if the specified name is a valid tag name ("struct foo"). If 351 /// so, this returns the TST for the tag corresponding to it (TST_enum, 352 /// TST_union, TST_struct, TST_interface, TST_class). This is used to diagnose 353 /// cases in C where the user forgot to specify the tag. 354 DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 355 // Do a tag name lookup in this scope. 356 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 357 LookupName(R, S, false); 358 R.suppressDiagnostics(); 359 if (R.getResultKind() == LookupResult::Found) 360 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 361 switch (TD->getTagKind()) { 362 case TTK_Struct: return DeclSpec::TST_struct; 363 case TTK_Interface: return DeclSpec::TST_interface; 364 case TTK_Union: return DeclSpec::TST_union; 365 case TTK_Class: return DeclSpec::TST_class; 366 case TTK_Enum: return DeclSpec::TST_enum; 367 } 368 } 369 370 return DeclSpec::TST_unspecified; 371 } 372 373 /// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 374 /// if a CXXScopeSpec's type is equal to the type of one of the base classes 375 /// then downgrade the missing typename error to a warning. 376 /// This is needed for MSVC compatibility; Example: 377 /// @code 378 /// template<class T> class A { 379 /// public: 380 /// typedef int TYPE; 381 /// }; 382 /// template<class T> class B : public A<T> { 383 /// public: 384 /// A<T>::TYPE a; // no typename required because A<T> is a base class. 385 /// }; 386 /// @endcode 387 bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 388 if (CurContext->isRecord()) { 389 const Type *Ty = SS->getScopeRep()->getAsType(); 390 391 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 392 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 393 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 394 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 395 return true; 396 return S->isFunctionPrototypeScope(); 397 } 398 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 399 } 400 401 bool Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II, 402 SourceLocation IILoc, 403 Scope *S, 404 CXXScopeSpec *SS, 405 ParsedType &SuggestedType) { 406 // We don't have anything to suggest (yet). 407 SuggestedType = ParsedType(); 408 409 // There may have been a typo in the name of the type. Look up typo 410 // results, in case we have something that we can suggest. 411 TypeNameValidatorCCC Validator(false); 412 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(II, IILoc), 413 LookupOrdinaryName, S, SS, 414 Validator)) { 415 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 416 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 417 418 if (Corrected.isKeyword()) { 419 // We corrected to a keyword. 420 IdentifierInfo *NewII = Corrected.getCorrectionAsIdentifierInfo(); 421 if (!isSimpleTypeSpecifier(NewII->getTokenID())) 422 CorrectedQuotedStr = "the keyword " + CorrectedQuotedStr; 423 Diag(IILoc, diag::err_unknown_typename_suggest) 424 << II << CorrectedQuotedStr 425 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 426 II = NewII; 427 } else { 428 NamedDecl *Result = Corrected.getCorrectionDecl(); 429 // We found a similarly-named type or interface; suggest that. 430 if (!SS || !SS->isSet()) 431 Diag(IILoc, diag::err_unknown_typename_suggest) 432 << II << CorrectedQuotedStr 433 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 434 else if (DeclContext *DC = computeDeclContext(*SS, false)) 435 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 436 << II << DC << CorrectedQuotedStr << SS->getRange() 437 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 438 CorrectedStr); 439 else 440 llvm_unreachable("could not have corrected a typo here"); 441 442 Diag(Result->getLocation(), diag::note_previous_decl) 443 << CorrectedQuotedStr; 444 445 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 446 false, false, ParsedType(), 447 /*IsCtorOrDtorName=*/false, 448 /*NonTrivialTypeSourceInfo=*/true); 449 } 450 return true; 451 } 452 453 if (getLangOpts().CPlusPlus) { 454 // See if II is a class template that the user forgot to pass arguments to. 455 UnqualifiedId Name; 456 Name.setIdentifier(II, IILoc); 457 CXXScopeSpec EmptySS; 458 TemplateTy TemplateResult; 459 bool MemberOfUnknownSpecialization; 460 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 461 Name, ParsedType(), true, TemplateResult, 462 MemberOfUnknownSpecialization) == TNK_Type_template) { 463 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 464 Diag(IILoc, diag::err_template_missing_args) << TplName; 465 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 466 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 467 << TplDecl->getTemplateParameters()->getSourceRange(); 468 } 469 return true; 470 } 471 } 472 473 // FIXME: Should we move the logic that tries to recover from a missing tag 474 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 475 476 if (!SS || (!SS->isSet() && !SS->isInvalid())) 477 Diag(IILoc, diag::err_unknown_typename) << II; 478 else if (DeclContext *DC = computeDeclContext(*SS, false)) 479 Diag(IILoc, diag::err_typename_nested_not_found) 480 << II << DC << SS->getRange(); 481 else if (isDependentScopeSpecifier(*SS)) { 482 unsigned DiagID = diag::err_typename_missing; 483 if (getLangOpts().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 484 DiagID = diag::warn_typename_missing; 485 486 Diag(SS->getRange().getBegin(), DiagID) 487 << (NestedNameSpecifier *)SS->getScopeRep() << II->getName() 488 << SourceRange(SS->getRange().getBegin(), IILoc) 489 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 490 SuggestedType = ActOnTypenameType(S, SourceLocation(), 491 *SS, *II, IILoc).get(); 492 } else { 493 assert(SS && SS->isInvalid() && 494 "Invalid scope specifier has already been diagnosed"); 495 } 496 497 return true; 498 } 499 500 /// \brief Determine whether the given result set contains either a type name 501 /// or 502 static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 503 bool CheckTemplate = R.getSema().getLangOpts().CPlusPlus && 504 NextToken.is(tok::less); 505 506 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 507 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 508 return true; 509 510 if (CheckTemplate && isa<TemplateDecl>(*I)) 511 return true; 512 } 513 514 return false; 515 } 516 517 static bool isTagTypeWithMissingTag(Sema &SemaRef, LookupResult &Result, 518 Scope *S, CXXScopeSpec &SS, 519 IdentifierInfo *&Name, 520 SourceLocation NameLoc) { 521 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupTagName); 522 SemaRef.LookupParsedName(R, S, &SS); 523 if (TagDecl *Tag = R.getAsSingle<TagDecl>()) { 524 const char *TagName = 0; 525 const char *FixItTagName = 0; 526 switch (Tag->getTagKind()) { 527 case TTK_Class: 528 TagName = "class"; 529 FixItTagName = "class "; 530 break; 531 532 case TTK_Enum: 533 TagName = "enum"; 534 FixItTagName = "enum "; 535 break; 536 537 case TTK_Struct: 538 TagName = "struct"; 539 FixItTagName = "struct "; 540 break; 541 542 case TTK_Interface: 543 TagName = "__interface"; 544 FixItTagName = "__interface "; 545 break; 546 547 case TTK_Union: 548 TagName = "union"; 549 FixItTagName = "union "; 550 break; 551 } 552 553 SemaRef.Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 554 << Name << TagName << SemaRef.getLangOpts().CPlusPlus 555 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 556 557 for (LookupResult::iterator I = Result.begin(), IEnd = Result.end(); 558 I != IEnd; ++I) 559 SemaRef.Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type) 560 << Name << TagName; 561 562 // Replace lookup results with just the tag decl. 563 Result.clear(Sema::LookupTagName); 564 SemaRef.LookupParsedName(Result, S, &SS); 565 return true; 566 } 567 568 return false; 569 } 570 571 /// Build a ParsedType for a simple-type-specifier with a nested-name-specifier. 572 static ParsedType buildNestedType(Sema &S, CXXScopeSpec &SS, 573 QualType T, SourceLocation NameLoc) { 574 ASTContext &Context = S.Context; 575 576 TypeLocBuilder Builder; 577 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 578 579 T = S.getElaboratedType(ETK_None, SS, T); 580 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 581 ElabTL.setElaboratedKeywordLoc(SourceLocation()); 582 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context)); 583 return S.CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 584 } 585 586 Sema::NameClassification Sema::ClassifyName(Scope *S, 587 CXXScopeSpec &SS, 588 IdentifierInfo *&Name, 589 SourceLocation NameLoc, 590 const Token &NextToken, 591 bool IsAddressOfOperand, 592 CorrectionCandidateCallback *CCC) { 593 DeclarationNameInfo NameInfo(Name, NameLoc); 594 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 595 596 if (NextToken.is(tok::coloncolon)) { 597 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 598 QualType(), false, SS, 0, false); 599 600 } 601 602 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 603 LookupParsedName(Result, S, &SS, !CurMethod); 604 605 // Perform lookup for Objective-C instance variables (including automatically 606 // synthesized instance variables), if we're in an Objective-C method. 607 // FIXME: This lookup really, really needs to be folded in to the normal 608 // unqualified lookup mechanism. 609 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 610 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 611 if (E.get() || E.isInvalid()) 612 return E; 613 } 614 615 bool SecondTry = false; 616 bool IsFilteredTemplateName = false; 617 618 Corrected: 619 switch (Result.getResultKind()) { 620 case LookupResult::NotFound: 621 // If an unqualified-id is followed by a '(', then we have a function 622 // call. 623 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 624 // In C++, this is an ADL-only call. 625 // FIXME: Reference? 626 if (getLangOpts().CPlusPlus) 627 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 628 629 // C90 6.3.2.2: 630 // If the expression that precedes the parenthesized argument list in a 631 // function call consists solely of an identifier, and if no 632 // declaration is visible for this identifier, the identifier is 633 // implicitly declared exactly as if, in the innermost block containing 634 // the function call, the declaration 635 // 636 // extern int identifier (); 637 // 638 // appeared. 639 // 640 // We also allow this in C99 as an extension. 641 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 642 Result.addDecl(D); 643 Result.resolveKind(); 644 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 645 } 646 } 647 648 // In C, we first see whether there is a tag type by the same name, in 649 // which case it's likely that the user just forget to write "enum", 650 // "struct", or "union". 651 if (!getLangOpts().CPlusPlus && !SecondTry && 652 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) { 653 break; 654 } 655 656 // Perform typo correction to determine if there is another name that is 657 // close to this name. 658 if (!SecondTry && CCC) { 659 SecondTry = true; 660 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 661 Result.getLookupKind(), S, 662 &SS, *CCC)) { 663 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 664 unsigned QualifiedDiag = diag::err_no_member_suggest; 665 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 666 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 667 668 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 669 NamedDecl *UnderlyingFirstDecl 670 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 671 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 672 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 673 UnqualifiedDiag = diag::err_no_template_suggest; 674 QualifiedDiag = diag::err_no_member_template_suggest; 675 } else if (UnderlyingFirstDecl && 676 (isa<TypeDecl>(UnderlyingFirstDecl) || 677 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 678 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 679 UnqualifiedDiag = diag::err_unknown_typename_suggest; 680 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 681 } 682 683 if (SS.isEmpty()) 684 Diag(NameLoc, UnqualifiedDiag) 685 << Name << CorrectedQuotedStr 686 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 687 else // FIXME: is this even reachable? Test it. 688 Diag(NameLoc, QualifiedDiag) 689 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 690 << SS.getRange() 691 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 692 CorrectedStr); 693 694 // Update the name, so that the caller has the new name. 695 Name = Corrected.getCorrectionAsIdentifierInfo(); 696 697 // Typo correction corrected to a keyword. 698 if (Corrected.isKeyword()) 699 return Corrected.getCorrectionAsIdentifierInfo(); 700 701 // Also update the LookupResult... 702 // FIXME: This should probably go away at some point 703 Result.clear(); 704 Result.setLookupName(Corrected.getCorrection()); 705 if (FirstDecl) { 706 Result.addDecl(FirstDecl); 707 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 708 << CorrectedQuotedStr; 709 } 710 711 // If we found an Objective-C instance variable, let 712 // LookupInObjCMethod build the appropriate expression to 713 // reference the ivar. 714 // FIXME: This is a gross hack. 715 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 716 Result.clear(); 717 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 718 return E; 719 } 720 721 goto Corrected; 722 } 723 } 724 725 // We failed to correct; just fall through and let the parser deal with it. 726 Result.suppressDiagnostics(); 727 return NameClassification::Unknown(); 728 729 case LookupResult::NotFoundInCurrentInstantiation: { 730 // We performed name lookup into the current instantiation, and there were 731 // dependent bases, so we treat this result the same way as any other 732 // dependent nested-name-specifier. 733 734 // C++ [temp.res]p2: 735 // A name used in a template declaration or definition and that is 736 // dependent on a template-parameter is assumed not to name a type 737 // unless the applicable name lookup finds a type name or the name is 738 // qualified by the keyword typename. 739 // 740 // FIXME: If the next token is '<', we might want to ask the parser to 741 // perform some heroics to see if we actually have a 742 // template-argument-list, which would indicate a missing 'template' 743 // keyword here. 744 return ActOnDependentIdExpression(SS, /*TemplateKWLoc=*/SourceLocation(), 745 NameInfo, IsAddressOfOperand, 746 /*TemplateArgs=*/0); 747 } 748 749 case LookupResult::Found: 750 case LookupResult::FoundOverloaded: 751 case LookupResult::FoundUnresolvedValue: 752 break; 753 754 case LookupResult::Ambiguous: 755 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 756 hasAnyAcceptableTemplateNames(Result)) { 757 // C++ [temp.local]p3: 758 // A lookup that finds an injected-class-name (10.2) can result in an 759 // ambiguity in certain cases (for example, if it is found in more than 760 // one base class). If all of the injected-class-names that are found 761 // refer to specializations of the same class template, and if the name 762 // is followed by a template-argument-list, the reference refers to the 763 // class template itself and not a specialization thereof, and is not 764 // ambiguous. 765 // 766 // This filtering can make an ambiguous result into an unambiguous one, 767 // so try again after filtering out template names. 768 FilterAcceptableTemplateNames(Result); 769 if (!Result.isAmbiguous()) { 770 IsFilteredTemplateName = true; 771 break; 772 } 773 } 774 775 // Diagnose the ambiguity and return an error. 776 return NameClassification::Error(); 777 } 778 779 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 780 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 781 // C++ [temp.names]p3: 782 // After name lookup (3.4) finds that a name is a template-name or that 783 // an operator-function-id or a literal- operator-id refers to a set of 784 // overloaded functions any member of which is a function template if 785 // this is followed by a <, the < is always taken as the delimiter of a 786 // template-argument-list and never as the less-than operator. 787 if (!IsFilteredTemplateName) 788 FilterAcceptableTemplateNames(Result); 789 790 if (!Result.empty()) { 791 bool IsFunctionTemplate; 792 TemplateName Template; 793 if (Result.end() - Result.begin() > 1) { 794 IsFunctionTemplate = true; 795 Template = Context.getOverloadedTemplateName(Result.begin(), 796 Result.end()); 797 } else { 798 TemplateDecl *TD 799 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 800 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 801 802 if (SS.isSet() && !SS.isInvalid()) 803 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 804 /*TemplateKeyword=*/false, 805 TD); 806 else 807 Template = TemplateName(TD); 808 } 809 810 if (IsFunctionTemplate) { 811 // Function templates always go through overload resolution, at which 812 // point we'll perform the various checks (e.g., accessibility) we need 813 // to based on which function we selected. 814 Result.suppressDiagnostics(); 815 816 return NameClassification::FunctionTemplate(Template); 817 } 818 819 return NameClassification::TypeTemplate(Template); 820 } 821 } 822 823 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 824 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 825 DiagnoseUseOfDecl(Type, NameLoc); 826 QualType T = Context.getTypeDeclType(Type); 827 if (SS.isNotEmpty()) 828 return buildNestedType(*this, SS, T, NameLoc); 829 return ParsedType::make(T); 830 } 831 832 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 833 if (!Class) { 834 // FIXME: It's unfortunate that we don't have a Type node for handling this. 835 if (ObjCCompatibleAliasDecl *Alias 836 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 837 Class = Alias->getClassInterface(); 838 } 839 840 if (Class) { 841 DiagnoseUseOfDecl(Class, NameLoc); 842 843 if (NextToken.is(tok::period)) { 844 // Interface. <something> is parsed as a property reference expression. 845 // Just return "unknown" as a fall-through for now. 846 Result.suppressDiagnostics(); 847 return NameClassification::Unknown(); 848 } 849 850 QualType T = Context.getObjCInterfaceType(Class); 851 return ParsedType::make(T); 852 } 853 854 // We can have a type template here if we're classifying a template argument. 855 if (isa<TemplateDecl>(FirstDecl) && !isa<FunctionTemplateDecl>(FirstDecl)) 856 return NameClassification::TypeTemplate( 857 TemplateName(cast<TemplateDecl>(FirstDecl))); 858 859 // Check for a tag type hidden by a non-type decl in a few cases where it 860 // seems likely a type is wanted instead of the non-type that was found. 861 if (!getLangOpts().ObjC1) { 862 bool NextIsOp = NextToken.is(tok::amp) || NextToken.is(tok::star); 863 if ((NextToken.is(tok::identifier) || 864 (NextIsOp && FirstDecl->isFunctionOrFunctionTemplate())) && 865 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) { 866 TypeDecl *Type = Result.getAsSingle<TypeDecl>(); 867 DiagnoseUseOfDecl(Type, NameLoc); 868 QualType T = Context.getTypeDeclType(Type); 869 if (SS.isNotEmpty()) 870 return buildNestedType(*this, SS, T, NameLoc); 871 return ParsedType::make(T); 872 } 873 } 874 875 if (FirstDecl->isCXXClassMember()) 876 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0); 877 878 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 879 return BuildDeclarationNameExpr(SS, Result, ADL); 880 } 881 882 // Determines the context to return to after temporarily entering a 883 // context. This depends in an unnecessarily complicated way on the 884 // exact ordering of callbacks from the parser. 885 DeclContext *Sema::getContainingDC(DeclContext *DC) { 886 887 // Functions defined inline within classes aren't parsed until we've 888 // finished parsing the top-level class, so the top-level class is 889 // the context we'll need to return to. 890 if (isa<FunctionDecl>(DC)) { 891 DC = DC->getLexicalParent(); 892 893 // A function not defined within a class will always return to its 894 // lexical context. 895 if (!isa<CXXRecordDecl>(DC)) 896 return DC; 897 898 // A C++ inline method/friend is parsed *after* the topmost class 899 // it was declared in is fully parsed ("complete"); the topmost 900 // class is the context we need to return to. 901 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 902 DC = RD; 903 904 // Return the declaration context of the topmost class the inline method is 905 // declared in. 906 return DC; 907 } 908 909 return DC->getLexicalParent(); 910 } 911 912 void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 913 assert(getContainingDC(DC) == CurContext && 914 "The next DeclContext should be lexically contained in the current one."); 915 CurContext = DC; 916 S->setEntity(DC); 917 } 918 919 void Sema::PopDeclContext() { 920 assert(CurContext && "DeclContext imbalance!"); 921 922 CurContext = getContainingDC(CurContext); 923 assert(CurContext && "Popped translation unit!"); 924 } 925 926 /// EnterDeclaratorContext - Used when we must lookup names in the context 927 /// of a declarator's nested name specifier. 928 /// 929 void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 930 // C++0x [basic.lookup.unqual]p13: 931 // A name used in the definition of a static data member of class 932 // X (after the qualified-id of the static member) is looked up as 933 // if the name was used in a member function of X. 934 // C++0x [basic.lookup.unqual]p14: 935 // If a variable member of a namespace is defined outside of the 936 // scope of its namespace then any name used in the definition of 937 // the variable member (after the declarator-id) is looked up as 938 // if the definition of the variable member occurred in its 939 // namespace. 940 // Both of these imply that we should push a scope whose context 941 // is the semantic context of the declaration. We can't use 942 // PushDeclContext here because that context is not necessarily 943 // lexically contained in the current context. Fortunately, 944 // the containing scope should have the appropriate information. 945 946 assert(!S->getEntity() && "scope already has entity"); 947 948 #ifndef NDEBUG 949 Scope *Ancestor = S->getParent(); 950 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 951 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 952 #endif 953 954 CurContext = DC; 955 S->setEntity(DC); 956 } 957 958 void Sema::ExitDeclaratorContext(Scope *S) { 959 assert(S->getEntity() == CurContext && "Context imbalance!"); 960 961 // Switch back to the lexical context. The safety of this is 962 // enforced by an assert in EnterDeclaratorContext. 963 Scope *Ancestor = S->getParent(); 964 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 965 CurContext = (DeclContext*) Ancestor->getEntity(); 966 967 // We don't need to do anything with the scope, which is going to 968 // disappear. 969 } 970 971 972 void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 973 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 974 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 975 // We assume that the caller has already called 976 // ActOnReenterTemplateScope 977 FD = TFD->getTemplatedDecl(); 978 } 979 if (!FD) 980 return; 981 982 // Same implementation as PushDeclContext, but enters the context 983 // from the lexical parent, rather than the top-level class. 984 assert(CurContext == FD->getLexicalParent() && 985 "The next DeclContext should be lexically contained in the current one."); 986 CurContext = FD; 987 S->setEntity(CurContext); 988 989 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 990 ParmVarDecl *Param = FD->getParamDecl(P); 991 // If the parameter has an identifier, then add it to the scope 992 if (Param->getIdentifier()) { 993 S->AddDecl(Param); 994 IdResolver.AddDecl(Param); 995 } 996 } 997 } 998 999 1000 void Sema::ActOnExitFunctionContext() { 1001 // Same implementation as PopDeclContext, but returns to the lexical parent, 1002 // rather than the top-level class. 1003 assert(CurContext && "DeclContext imbalance!"); 1004 CurContext = CurContext->getLexicalParent(); 1005 assert(CurContext && "Popped translation unit!"); 1006 } 1007 1008 1009 /// \brief Determine whether we allow overloading of the function 1010 /// PrevDecl with another declaration. 1011 /// 1012 /// This routine determines whether overloading is possible, not 1013 /// whether some new function is actually an overload. It will return 1014 /// true in C++ (where we can always provide overloads) or, as an 1015 /// extension, in C when the previous function is already an 1016 /// overloaded function declaration or has the "overloadable" 1017 /// attribute. 1018 static bool AllowOverloadingOfFunction(LookupResult &Previous, 1019 ASTContext &Context) { 1020 if (Context.getLangOpts().CPlusPlus) 1021 return true; 1022 1023 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 1024 return true; 1025 1026 return (Previous.getResultKind() == LookupResult::Found 1027 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 1028 } 1029 1030 /// Add this decl to the scope shadowed decl chains. 1031 void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 1032 // Move up the scope chain until we find the nearest enclosing 1033 // non-transparent context. The declaration will be introduced into this 1034 // scope. 1035 while (S->getEntity() && 1036 ((DeclContext *)S->getEntity())->isTransparentContext()) 1037 S = S->getParent(); 1038 1039 // Add scoped declarations into their context, so that they can be 1040 // found later. Declarations without a context won't be inserted 1041 // into any context. 1042 if (AddToContext) 1043 CurContext->addDecl(D); 1044 1045 // Out-of-line definitions shouldn't be pushed into scope in C++. 1046 // Out-of-line variable and function definitions shouldn't even in C. 1047 if ((getLangOpts().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 1048 D->isOutOfLine() && 1049 !D->getDeclContext()->getRedeclContext()->Equals( 1050 D->getLexicalDeclContext()->getRedeclContext())) 1051 return; 1052 1053 // Template instantiations should also not be pushed into scope. 1054 if (isa<FunctionDecl>(D) && 1055 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 1056 return; 1057 1058 // If this replaces anything in the current scope, 1059 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 1060 IEnd = IdResolver.end(); 1061 for (; I != IEnd; ++I) { 1062 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 1063 S->RemoveDecl(*I); 1064 IdResolver.RemoveDecl(*I); 1065 1066 // Should only need to replace one decl. 1067 break; 1068 } 1069 } 1070 1071 S->AddDecl(D); 1072 1073 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 1074 // Implicitly-generated labels may end up getting generated in an order that 1075 // isn't strictly lexical, which breaks name lookup. Be careful to insert 1076 // the label at the appropriate place in the identifier chain. 1077 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 1078 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 1079 if (IDC == CurContext) { 1080 if (!S->isDeclScope(*I)) 1081 continue; 1082 } else if (IDC->Encloses(CurContext)) 1083 break; 1084 } 1085 1086 IdResolver.InsertDeclAfter(I, D); 1087 } else { 1088 IdResolver.AddDecl(D); 1089 } 1090 } 1091 1092 void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 1093 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 1094 TUScope->AddDecl(D); 1095 } 1096 1097 bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 1098 bool ExplicitInstantiationOrSpecialization) { 1099 return IdResolver.isDeclInScope(D, Ctx, S, 1100 ExplicitInstantiationOrSpecialization); 1101 } 1102 1103 Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 1104 DeclContext *TargetDC = DC->getPrimaryContext(); 1105 do { 1106 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 1107 if (ScopeDC->getPrimaryContext() == TargetDC) 1108 return S; 1109 } while ((S = S->getParent())); 1110 1111 return 0; 1112 } 1113 1114 static bool isOutOfScopePreviousDeclaration(NamedDecl *, 1115 DeclContext*, 1116 ASTContext&); 1117 1118 /// Filters out lookup results that don't fall within the given scope 1119 /// as determined by isDeclInScope. 1120 void Sema::FilterLookupForScope(LookupResult &R, 1121 DeclContext *Ctx, Scope *S, 1122 bool ConsiderLinkage, 1123 bool ExplicitInstantiationOrSpecialization) { 1124 LookupResult::Filter F = R.makeFilter(); 1125 while (F.hasNext()) { 1126 NamedDecl *D = F.next(); 1127 1128 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 1129 continue; 1130 1131 if (ConsiderLinkage && 1132 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 1133 continue; 1134 1135 F.erase(); 1136 } 1137 1138 F.done(); 1139 } 1140 1141 static bool isUsingDecl(NamedDecl *D) { 1142 return isa<UsingShadowDecl>(D) || 1143 isa<UnresolvedUsingTypenameDecl>(D) || 1144 isa<UnresolvedUsingValueDecl>(D); 1145 } 1146 1147 /// Removes using shadow declarations from the lookup results. 1148 static void RemoveUsingDecls(LookupResult &R) { 1149 LookupResult::Filter F = R.makeFilter(); 1150 while (F.hasNext()) 1151 if (isUsingDecl(F.next())) 1152 F.erase(); 1153 1154 F.done(); 1155 } 1156 1157 /// \brief Check for this common pattern: 1158 /// @code 1159 /// class S { 1160 /// S(const S&); // DO NOT IMPLEMENT 1161 /// void operator=(const S&); // DO NOT IMPLEMENT 1162 /// }; 1163 /// @endcode 1164 static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1165 // FIXME: Should check for private access too but access is set after we get 1166 // the decl here. 1167 if (D->doesThisDeclarationHaveABody()) 1168 return false; 1169 1170 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1171 return CD->isCopyConstructor(); 1172 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1173 return Method->isCopyAssignmentOperator(); 1174 return false; 1175 } 1176 1177 // We need this to handle 1178 // 1179 // typedef struct { 1180 // void *foo() { return 0; } 1181 // } A; 1182 // 1183 // When we see foo we don't know if after the typedef we will get 'A' or '*A' 1184 // for example. If 'A', foo will have external linkage. If we have '*A', 1185 // foo will have no linkage. Since we can't know untill we get to the end 1186 // of the typedef, this function finds out if D might have non external linkage. 1187 // Callers should verify at the end of the TU if it D has external linkage or 1188 // not. 1189 bool Sema::mightHaveNonExternalLinkage(const DeclaratorDecl *D) { 1190 const DeclContext *DC = D->getDeclContext(); 1191 while (!DC->isTranslationUnit()) { 1192 if (const RecordDecl *RD = dyn_cast<RecordDecl>(DC)){ 1193 if (!RD->hasNameForLinkage()) 1194 return true; 1195 } 1196 DC = DC->getParent(); 1197 } 1198 1199 return !D->hasExternalLinkage(); 1200 } 1201 1202 bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1203 assert(D); 1204 1205 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1206 return false; 1207 1208 // Ignore class templates. 1209 if (D->getDeclContext()->isDependentContext() || 1210 D->getLexicalDeclContext()->isDependentContext()) 1211 return false; 1212 1213 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1214 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1215 return false; 1216 1217 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1218 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1219 return false; 1220 } else { 1221 // 'static inline' functions are used in headers; don't warn. 1222 if (FD->getStorageClass() == SC_Static && 1223 FD->isInlineSpecified()) 1224 return false; 1225 } 1226 1227 if (FD->doesThisDeclarationHaveABody() && 1228 Context.DeclMustBeEmitted(FD)) 1229 return false; 1230 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1231 // Don't warn on variables of const-qualified or reference type, since their 1232 // values can be used even if though they're not odr-used, and because const 1233 // qualified variables can appear in headers in contexts where they're not 1234 // intended to be used. 1235 // FIXME: Use more principled rules for these exemptions. 1236 if (!VD->isFileVarDecl() || 1237 VD->getType().isConstQualified() || 1238 VD->getType()->isReferenceType() || 1239 Context.DeclMustBeEmitted(VD)) 1240 return false; 1241 1242 if (VD->isStaticDataMember() && 1243 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1244 return false; 1245 1246 } else { 1247 return false; 1248 } 1249 1250 // Only warn for unused decls internal to the translation unit. 1251 return mightHaveNonExternalLinkage(D); 1252 } 1253 1254 void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1255 if (!D) 1256 return; 1257 1258 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1259 const FunctionDecl *First = FD->getFirstDeclaration(); 1260 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1261 return; // First should already be in the vector. 1262 } 1263 1264 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1265 const VarDecl *First = VD->getFirstDeclaration(); 1266 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1267 return; // First should already be in the vector. 1268 } 1269 1270 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1271 UnusedFileScopedDecls.push_back(D); 1272 } 1273 1274 static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1275 if (D->isInvalidDecl()) 1276 return false; 1277 1278 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1279 return false; 1280 1281 if (isa<LabelDecl>(D)) 1282 return true; 1283 1284 // White-list anything that isn't a local variable. 1285 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1286 !D->getDeclContext()->isFunctionOrMethod()) 1287 return false; 1288 1289 // Types of valid local variables should be complete, so this should succeed. 1290 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1291 1292 // White-list anything with an __attribute__((unused)) type. 1293 QualType Ty = VD->getType(); 1294 1295 // Only look at the outermost level of typedef. 1296 if (const TypedefType *TT = Ty->getAs<TypedefType>()) { 1297 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1298 return false; 1299 } 1300 1301 // If we failed to complete the type for some reason, or if the type is 1302 // dependent, don't diagnose the variable. 1303 if (Ty->isIncompleteType() || Ty->isDependentType()) 1304 return false; 1305 1306 if (const TagType *TT = Ty->getAs<TagType>()) { 1307 const TagDecl *Tag = TT->getDecl(); 1308 if (Tag->hasAttr<UnusedAttr>()) 1309 return false; 1310 1311 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1312 if (!RD->hasTrivialDestructor()) 1313 return false; 1314 1315 if (const Expr *Init = VD->getInit()) { 1316 if (const ExprWithCleanups *Cleanups = dyn_cast<ExprWithCleanups>(Init)) 1317 Init = Cleanups->getSubExpr(); 1318 const CXXConstructExpr *Construct = 1319 dyn_cast<CXXConstructExpr>(Init); 1320 if (Construct && !Construct->isElidable()) { 1321 CXXConstructorDecl *CD = Construct->getConstructor(); 1322 if (!CD->isTrivial()) 1323 return false; 1324 } 1325 } 1326 } 1327 } 1328 1329 // TODO: __attribute__((unused)) templates? 1330 } 1331 1332 return true; 1333 } 1334 1335 static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1336 FixItHint &Hint) { 1337 if (isa<LabelDecl>(D)) { 1338 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1339 tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), true); 1340 if (AfterColon.isInvalid()) 1341 return; 1342 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1343 getCharRange(D->getLocStart(), AfterColon)); 1344 } 1345 return; 1346 } 1347 1348 /// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1349 /// unless they are marked attr(unused). 1350 void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1351 FixItHint Hint; 1352 if (!ShouldDiagnoseUnusedDecl(D)) 1353 return; 1354 1355 GenerateFixForUnusedDecl(D, Context, Hint); 1356 1357 unsigned DiagID; 1358 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1359 DiagID = diag::warn_unused_exception_param; 1360 else if (isa<LabelDecl>(D)) 1361 DiagID = diag::warn_unused_label; 1362 else 1363 DiagID = diag::warn_unused_variable; 1364 1365 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1366 } 1367 1368 static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1369 // Verify that we have no forward references left. If so, there was a goto 1370 // or address of a label taken, but no definition of it. Label fwd 1371 // definitions are indicated with a null substmt. 1372 if (L->getStmt() == 0) 1373 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1374 } 1375 1376 void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1377 if (S->decl_empty()) return; 1378 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1379 "Scope shouldn't contain decls!"); 1380 1381 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1382 I != E; ++I) { 1383 Decl *TmpD = (*I); 1384 assert(TmpD && "This decl didn't get pushed??"); 1385 1386 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1387 NamedDecl *D = cast<NamedDecl>(TmpD); 1388 1389 if (!D->getDeclName()) continue; 1390 1391 // Diagnose unused variables in this scope. 1392 if (!S->hasErrorOccurred()) 1393 DiagnoseUnusedDecl(D); 1394 1395 // If this was a forward reference to a label, verify it was defined. 1396 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1397 CheckPoppedLabel(LD, *this); 1398 1399 // Remove this name from our lexical scope. 1400 IdResolver.RemoveDecl(D); 1401 } 1402 } 1403 1404 void Sema::ActOnStartFunctionDeclarator() { 1405 ++InFunctionDeclarator; 1406 } 1407 1408 void Sema::ActOnEndFunctionDeclarator() { 1409 assert(InFunctionDeclarator); 1410 --InFunctionDeclarator; 1411 } 1412 1413 /// \brief Look for an Objective-C class in the translation unit. 1414 /// 1415 /// \param Id The name of the Objective-C class we're looking for. If 1416 /// typo-correction fixes this name, the Id will be updated 1417 /// to the fixed name. 1418 /// 1419 /// \param IdLoc The location of the name in the translation unit. 1420 /// 1421 /// \param DoTypoCorrection If true, this routine will attempt typo correction 1422 /// if there is no class with the given name. 1423 /// 1424 /// \returns The declaration of the named Objective-C class, or NULL if the 1425 /// class could not be found. 1426 ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1427 SourceLocation IdLoc, 1428 bool DoTypoCorrection) { 1429 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1430 // creation from this context. 1431 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1432 1433 if (!IDecl && DoTypoCorrection) { 1434 // Perform typo correction at the given location, but only if we 1435 // find an Objective-C class name. 1436 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1437 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1438 LookupOrdinaryName, TUScope, NULL, 1439 Validator)) { 1440 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1441 Diag(IdLoc, diag::err_undef_interface_suggest) 1442 << Id << IDecl->getDeclName() 1443 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1444 Diag(IDecl->getLocation(), diag::note_previous_decl) 1445 << IDecl->getDeclName(); 1446 1447 Id = IDecl->getIdentifier(); 1448 } 1449 } 1450 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1451 // This routine must always return a class definition, if any. 1452 if (Def && Def->getDefinition()) 1453 Def = Def->getDefinition(); 1454 return Def; 1455 } 1456 1457 /// getNonFieldDeclScope - Retrieves the innermost scope, starting 1458 /// from S, where a non-field would be declared. This routine copes 1459 /// with the difference between C and C++ scoping rules in structs and 1460 /// unions. For example, the following code is well-formed in C but 1461 /// ill-formed in C++: 1462 /// @code 1463 /// struct S6 { 1464 /// enum { BAR } e; 1465 /// }; 1466 /// 1467 /// void test_S6() { 1468 /// struct S6 a; 1469 /// a.e = BAR; 1470 /// } 1471 /// @endcode 1472 /// For the declaration of BAR, this routine will return a different 1473 /// scope. The scope S will be the scope of the unnamed enumeration 1474 /// within S6. In C++, this routine will return the scope associated 1475 /// with S6, because the enumeration's scope is a transparent 1476 /// context but structures can contain non-field names. In C, this 1477 /// routine will return the translation unit scope, since the 1478 /// enumeration's scope is a transparent context and structures cannot 1479 /// contain non-field names. 1480 Scope *Sema::getNonFieldDeclScope(Scope *S) { 1481 while (((S->getFlags() & Scope::DeclScope) == 0) || 1482 (S->getEntity() && 1483 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1484 (S->isClassScope() && !getLangOpts().CPlusPlus)) 1485 S = S->getParent(); 1486 return S; 1487 } 1488 1489 /// \brief Looks up the declaration of "struct objc_super" and 1490 /// saves it for later use in building builtin declaration of 1491 /// objc_msgSendSuper and objc_msgSendSuper_stret. If no such 1492 /// pre-existing declaration exists no action takes place. 1493 static void LookupPredefedObjCSuperType(Sema &ThisSema, Scope *S, 1494 IdentifierInfo *II) { 1495 if (!II->isStr("objc_msgSendSuper")) 1496 return; 1497 ASTContext &Context = ThisSema.Context; 1498 1499 LookupResult Result(ThisSema, &Context.Idents.get("objc_super"), 1500 SourceLocation(), Sema::LookupTagName); 1501 ThisSema.LookupName(Result, S); 1502 if (Result.getResultKind() == LookupResult::Found) 1503 if (const TagDecl *TD = Result.getAsSingle<TagDecl>()) 1504 Context.setObjCSuperType(Context.getTagDeclType(TD)); 1505 } 1506 1507 /// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1508 /// file scope. lazily create a decl for it. ForRedeclaration is true 1509 /// if we're creating this built-in in anticipation of redeclaring the 1510 /// built-in. 1511 NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1512 Scope *S, bool ForRedeclaration, 1513 SourceLocation Loc) { 1514 LookupPredefedObjCSuperType(*this, S, II); 1515 1516 Builtin::ID BID = (Builtin::ID)bid; 1517 1518 ASTContext::GetBuiltinTypeError Error; 1519 QualType R = Context.GetBuiltinType(BID, Error); 1520 switch (Error) { 1521 case ASTContext::GE_None: 1522 // Okay 1523 break; 1524 1525 case ASTContext::GE_Missing_stdio: 1526 if (ForRedeclaration) 1527 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1528 << Context.BuiltinInfo.GetName(BID); 1529 return 0; 1530 1531 case ASTContext::GE_Missing_setjmp: 1532 if (ForRedeclaration) 1533 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1534 << Context.BuiltinInfo.GetName(BID); 1535 return 0; 1536 1537 case ASTContext::GE_Missing_ucontext: 1538 if (ForRedeclaration) 1539 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1540 << Context.BuiltinInfo.GetName(BID); 1541 return 0; 1542 } 1543 1544 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1545 Diag(Loc, diag::ext_implicit_lib_function_decl) 1546 << Context.BuiltinInfo.GetName(BID) 1547 << R; 1548 if (Context.BuiltinInfo.getHeaderName(BID) && 1549 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1550 != DiagnosticsEngine::Ignored) 1551 Diag(Loc, diag::note_please_include_header) 1552 << Context.BuiltinInfo.getHeaderName(BID) 1553 << Context.BuiltinInfo.GetName(BID); 1554 } 1555 1556 FunctionDecl *New = FunctionDecl::Create(Context, 1557 Context.getTranslationUnitDecl(), 1558 Loc, Loc, II, R, /*TInfo=*/0, 1559 SC_Extern, 1560 SC_None, false, 1561 /*hasPrototype=*/true); 1562 New->setImplicit(); 1563 1564 // Create Decl objects for each parameter, adding them to the 1565 // FunctionDecl. 1566 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1567 SmallVector<ParmVarDecl*, 16> Params; 1568 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1569 ParmVarDecl *parm = 1570 ParmVarDecl::Create(Context, New, SourceLocation(), 1571 SourceLocation(), 0, 1572 FT->getArgType(i), /*TInfo=*/0, 1573 SC_None, SC_None, 0); 1574 parm->setScopeInfo(0, i); 1575 Params.push_back(parm); 1576 } 1577 New->setParams(Params); 1578 } 1579 1580 AddKnownFunctionAttributes(New); 1581 1582 // TUScope is the translation-unit scope to insert this function into. 1583 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1584 // relate Scopes to DeclContexts, and probably eliminate CurContext 1585 // entirely, but we're not there yet. 1586 DeclContext *SavedContext = CurContext; 1587 CurContext = Context.getTranslationUnitDecl(); 1588 PushOnScopeChains(New, TUScope); 1589 CurContext = SavedContext; 1590 return New; 1591 } 1592 1593 /// \brief Filter out any previous declarations that the given declaration 1594 /// should not consider because they are not permitted to conflict, e.g., 1595 /// because they come from hidden sub-modules and do not refer to the same 1596 /// entity. 1597 static void filterNonConflictingPreviousDecls(ASTContext &context, 1598 NamedDecl *decl, 1599 LookupResult &previous){ 1600 // This is only interesting when modules are enabled. 1601 if (!context.getLangOpts().Modules) 1602 return; 1603 1604 // Empty sets are uninteresting. 1605 if (previous.empty()) 1606 return; 1607 1608 // If this declaration has external 1609 bool hasExternalLinkage = decl->hasExternalLinkage(); 1610 1611 LookupResult::Filter filter = previous.makeFilter(); 1612 while (filter.hasNext()) { 1613 NamedDecl *old = filter.next(); 1614 1615 // Non-hidden declarations are never ignored. 1616 if (!old->isHidden()) 1617 continue; 1618 1619 // If either has no-external linkage, ignore the old declaration. 1620 if (!hasExternalLinkage || old->getLinkage() != ExternalLinkage) 1621 filter.erase(); 1622 } 1623 1624 filter.done(); 1625 } 1626 1627 bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1628 QualType OldType; 1629 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1630 OldType = OldTypedef->getUnderlyingType(); 1631 else 1632 OldType = Context.getTypeDeclType(Old); 1633 QualType NewType = New->getUnderlyingType(); 1634 1635 if (NewType->isVariablyModifiedType()) { 1636 // Must not redefine a typedef with a variably-modified type. 1637 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1638 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1639 << Kind << NewType; 1640 if (Old->getLocation().isValid()) 1641 Diag(Old->getLocation(), diag::note_previous_definition); 1642 New->setInvalidDecl(); 1643 return true; 1644 } 1645 1646 if (OldType != NewType && 1647 !OldType->isDependentType() && 1648 !NewType->isDependentType() && 1649 !Context.hasSameType(OldType, NewType)) { 1650 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1651 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1652 << Kind << NewType << OldType; 1653 if (Old->getLocation().isValid()) 1654 Diag(Old->getLocation(), diag::note_previous_definition); 1655 New->setInvalidDecl(); 1656 return true; 1657 } 1658 return false; 1659 } 1660 1661 /// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1662 /// same name and scope as a previous declaration 'Old'. Figure out 1663 /// how to resolve this situation, merging decls or emitting 1664 /// diagnostics as appropriate. If there was an error, set New to be invalid. 1665 /// 1666 void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1667 // If the new decl is known invalid already, don't bother doing any 1668 // merging checks. 1669 if (New->isInvalidDecl()) return; 1670 1671 // Allow multiple definitions for ObjC built-in typedefs. 1672 // FIXME: Verify the underlying types are equivalent! 1673 if (getLangOpts().ObjC1) { 1674 const IdentifierInfo *TypeID = New->getIdentifier(); 1675 switch (TypeID->getLength()) { 1676 default: break; 1677 case 2: 1678 { 1679 if (!TypeID->isStr("id")) 1680 break; 1681 QualType T = New->getUnderlyingType(); 1682 if (!T->isPointerType()) 1683 break; 1684 if (!T->isVoidPointerType()) { 1685 QualType PT = T->getAs<PointerType>()->getPointeeType(); 1686 if (!PT->isStructureType()) 1687 break; 1688 } 1689 Context.setObjCIdRedefinitionType(T); 1690 // Install the built-in type for 'id', ignoring the current definition. 1691 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1692 return; 1693 } 1694 case 5: 1695 if (!TypeID->isStr("Class")) 1696 break; 1697 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1698 // Install the built-in type for 'Class', ignoring the current definition. 1699 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1700 return; 1701 case 3: 1702 if (!TypeID->isStr("SEL")) 1703 break; 1704 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1705 // Install the built-in type for 'SEL', ignoring the current definition. 1706 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1707 return; 1708 } 1709 // Fall through - the typedef name was not a builtin type. 1710 } 1711 1712 // Verify the old decl was also a type. 1713 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1714 if (!Old) { 1715 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1716 << New->getDeclName(); 1717 1718 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1719 if (OldD->getLocation().isValid()) 1720 Diag(OldD->getLocation(), diag::note_previous_definition); 1721 1722 return New->setInvalidDecl(); 1723 } 1724 1725 // If the old declaration is invalid, just give up here. 1726 if (Old->isInvalidDecl()) 1727 return New->setInvalidDecl(); 1728 1729 // If the typedef types are not identical, reject them in all languages and 1730 // with any extensions enabled. 1731 if (isIncompatibleTypedef(Old, New)) 1732 return; 1733 1734 // The types match. Link up the redeclaration chain if the old 1735 // declaration was a typedef. 1736 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1737 New->setPreviousDeclaration(Typedef); 1738 1739 if (getLangOpts().MicrosoftExt) 1740 return; 1741 1742 if (getLangOpts().CPlusPlus) { 1743 // C++ [dcl.typedef]p2: 1744 // In a given non-class scope, a typedef specifier can be used to 1745 // redefine the name of any type declared in that scope to refer 1746 // to the type to which it already refers. 1747 if (!isa<CXXRecordDecl>(CurContext)) 1748 return; 1749 1750 // C++0x [dcl.typedef]p4: 1751 // In a given class scope, a typedef specifier can be used to redefine 1752 // any class-name declared in that scope that is not also a typedef-name 1753 // to refer to the type to which it already refers. 1754 // 1755 // This wording came in via DR424, which was a correction to the 1756 // wording in DR56, which accidentally banned code like: 1757 // 1758 // struct S { 1759 // typedef struct A { } A; 1760 // }; 1761 // 1762 // in the C++03 standard. We implement the C++0x semantics, which 1763 // allow the above but disallow 1764 // 1765 // struct S { 1766 // typedef int I; 1767 // typedef int I; 1768 // }; 1769 // 1770 // since that was the intent of DR56. 1771 if (!isa<TypedefNameDecl>(Old)) 1772 return; 1773 1774 Diag(New->getLocation(), diag::err_redefinition) 1775 << New->getDeclName(); 1776 Diag(Old->getLocation(), diag::note_previous_definition); 1777 return New->setInvalidDecl(); 1778 } 1779 1780 // Modules always permit redefinition of typedefs, as does C11. 1781 if (getLangOpts().Modules || getLangOpts().C11) 1782 return; 1783 1784 // If we have a redefinition of a typedef in C, emit a warning. This warning 1785 // is normally mapped to an error, but can be controlled with 1786 // -Wtypedef-redefinition. If either the original or the redefinition is 1787 // in a system header, don't emit this for compatibility with GCC. 1788 if (getDiagnostics().getSuppressSystemWarnings() && 1789 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1790 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1791 return; 1792 1793 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1794 << New->getDeclName(); 1795 Diag(Old->getLocation(), diag::note_previous_definition); 1796 return; 1797 } 1798 1799 /// DeclhasAttr - returns true if decl Declaration already has the target 1800 /// attribute. 1801 static bool 1802 DeclHasAttr(const Decl *D, const Attr *A) { 1803 // There can be multiple AvailabilityAttr in a Decl. Make sure we copy 1804 // all of them. It is mergeAvailabilityAttr in SemaDeclAttr.cpp that is 1805 // responsible for making sure they are consistent. 1806 const AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(A); 1807 if (AA) 1808 return false; 1809 1810 // The following thread safety attributes can also be duplicated. 1811 switch (A->getKind()) { 1812 case attr::ExclusiveLocksRequired: 1813 case attr::SharedLocksRequired: 1814 case attr::LocksExcluded: 1815 case attr::ExclusiveLockFunction: 1816 case attr::SharedLockFunction: 1817 case attr::UnlockFunction: 1818 case attr::ExclusiveTrylockFunction: 1819 case attr::SharedTrylockFunction: 1820 case attr::GuardedBy: 1821 case attr::PtGuardedBy: 1822 case attr::AcquiredBefore: 1823 case attr::AcquiredAfter: 1824 return false; 1825 default: 1826 ; 1827 } 1828 1829 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1830 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1831 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1832 if ((*i)->getKind() == A->getKind()) { 1833 if (Ann) { 1834 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1835 return true; 1836 continue; 1837 } 1838 // FIXME: Don't hardcode this check 1839 if (OA && isa<OwnershipAttr>(*i)) 1840 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1841 return true; 1842 } 1843 1844 return false; 1845 } 1846 1847 static bool isAttributeTargetADefinition(Decl *D) { 1848 if (VarDecl *VD = dyn_cast<VarDecl>(D)) 1849 return VD->isThisDeclarationADefinition(); 1850 if (TagDecl *TD = dyn_cast<TagDecl>(D)) 1851 return TD->isCompleteDefinition() || TD->isBeingDefined(); 1852 return true; 1853 } 1854 1855 /// Merge alignment attributes from \p Old to \p New, taking into account the 1856 /// special semantics of C11's _Alignas specifier and C++11's alignas attribute. 1857 /// 1858 /// \return \c true if any attributes were added to \p New. 1859 static bool mergeAlignedAttrs(Sema &S, NamedDecl *New, Decl *Old) { 1860 // Look for alignas attributes on Old, and pick out whichever attribute 1861 // specifies the strictest alignment requirement. 1862 AlignedAttr *OldAlignasAttr = 0; 1863 AlignedAttr *OldStrictestAlignAttr = 0; 1864 unsigned OldAlign = 0; 1865 for (specific_attr_iterator<AlignedAttr> 1866 I = Old->specific_attr_begin<AlignedAttr>(), 1867 E = Old->specific_attr_end<AlignedAttr>(); I != E; ++I) { 1868 // FIXME: We have no way of representing inherited dependent alignments 1869 // in a case like: 1870 // template<int A, int B> struct alignas(A) X; 1871 // template<int A, int B> struct alignas(B) X {}; 1872 // For now, we just ignore any alignas attributes which are not on the 1873 // definition in such a case. 1874 if (I->isAlignmentDependent()) 1875 return false; 1876 1877 if (I->isAlignas()) 1878 OldAlignasAttr = *I; 1879 1880 unsigned Align = I->getAlignment(S.Context); 1881 if (Align > OldAlign) { 1882 OldAlign = Align; 1883 OldStrictestAlignAttr = *I; 1884 } 1885 } 1886 1887 // Look for alignas attributes on New. 1888 AlignedAttr *NewAlignasAttr = 0; 1889 unsigned NewAlign = 0; 1890 for (specific_attr_iterator<AlignedAttr> 1891 I = New->specific_attr_begin<AlignedAttr>(), 1892 E = New->specific_attr_end<AlignedAttr>(); I != E; ++I) { 1893 if (I->isAlignmentDependent()) 1894 return false; 1895 1896 if (I->isAlignas()) 1897 NewAlignasAttr = *I; 1898 1899 unsigned Align = I->getAlignment(S.Context); 1900 if (Align > NewAlign) 1901 NewAlign = Align; 1902 } 1903 1904 if (OldAlignasAttr && NewAlignasAttr && OldAlign != NewAlign) { 1905 // Both declarations have 'alignas' attributes. We require them to match. 1906 // C++11 [dcl.align]p6 and C11 6.7.5/7 both come close to saying this, but 1907 // fall short. (If two declarations both have alignas, they must both match 1908 // every definition, and so must match each other if there is a definition.) 1909 1910 // If either declaration only contains 'alignas(0)' specifiers, then it 1911 // specifies the natural alignment for the type. 1912 if (OldAlign == 0 || NewAlign == 0) { 1913 QualType Ty; 1914 if (ValueDecl *VD = dyn_cast<ValueDecl>(New)) 1915 Ty = VD->getType(); 1916 else 1917 Ty = S.Context.getTagDeclType(cast<TagDecl>(New)); 1918 1919 if (OldAlign == 0) 1920 OldAlign = S.Context.getTypeAlign(Ty); 1921 if (NewAlign == 0) 1922 NewAlign = S.Context.getTypeAlign(Ty); 1923 } 1924 1925 if (OldAlign != NewAlign) { 1926 S.Diag(NewAlignasAttr->getLocation(), diag::err_alignas_mismatch) 1927 << (unsigned)S.Context.toCharUnitsFromBits(OldAlign).getQuantity() 1928 << (unsigned)S.Context.toCharUnitsFromBits(NewAlign).getQuantity(); 1929 S.Diag(OldAlignasAttr->getLocation(), diag::note_previous_declaration); 1930 } 1931 } 1932 1933 if (OldAlignasAttr && !NewAlignasAttr && isAttributeTargetADefinition(New)) { 1934 // C++11 [dcl.align]p6: 1935 // if any declaration of an entity has an alignment-specifier, 1936 // every defining declaration of that entity shall specify an 1937 // equivalent alignment. 1938 // C11 6.7.5/7: 1939 // If the definition of an object does not have an alignment 1940 // specifier, any other declaration of that object shall also 1941 // have no alignment specifier. 1942 S.Diag(New->getLocation(), diag::err_alignas_missing_on_definition) 1943 << OldAlignasAttr->isC11(); 1944 S.Diag(OldAlignasAttr->getLocation(), diag::note_alignas_on_declaration) 1945 << OldAlignasAttr->isC11(); 1946 } 1947 1948 bool AnyAdded = false; 1949 1950 // Ensure we have an attribute representing the strictest alignment. 1951 if (OldAlign > NewAlign) { 1952 AlignedAttr *Clone = OldStrictestAlignAttr->clone(S.Context); 1953 Clone->setInherited(true); 1954 New->addAttr(Clone); 1955 AnyAdded = true; 1956 } 1957 1958 // Ensure we have an alignas attribute if the old declaration had one. 1959 if (OldAlignasAttr && !NewAlignasAttr && 1960 !(AnyAdded && OldStrictestAlignAttr->isAlignas())) { 1961 AlignedAttr *Clone = OldAlignasAttr->clone(S.Context); 1962 Clone->setInherited(true); 1963 New->addAttr(Clone); 1964 AnyAdded = true; 1965 } 1966 1967 return AnyAdded; 1968 } 1969 1970 static bool mergeDeclAttribute(Sema &S, NamedDecl *D, InheritableAttr *Attr, 1971 bool Override) { 1972 InheritableAttr *NewAttr = NULL; 1973 unsigned AttrSpellingListIndex = Attr->getSpellingListIndex(); 1974 if (AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(Attr)) 1975 NewAttr = S.mergeAvailabilityAttr(D, AA->getRange(), AA->getPlatform(), 1976 AA->getIntroduced(), AA->getDeprecated(), 1977 AA->getObsoleted(), AA->getUnavailable(), 1978 AA->getMessage(), Override, 1979 AttrSpellingListIndex); 1980 else if (VisibilityAttr *VA = dyn_cast<VisibilityAttr>(Attr)) 1981 NewAttr = S.mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility(), 1982 AttrSpellingListIndex); 1983 else if (TypeVisibilityAttr *VA = dyn_cast<TypeVisibilityAttr>(Attr)) 1984 NewAttr = S.mergeTypeVisibilityAttr(D, VA->getRange(), VA->getVisibility(), 1985 AttrSpellingListIndex); 1986 else if (DLLImportAttr *ImportA = dyn_cast<DLLImportAttr>(Attr)) 1987 NewAttr = S.mergeDLLImportAttr(D, ImportA->getRange(), 1988 AttrSpellingListIndex); 1989 else if (DLLExportAttr *ExportA = dyn_cast<DLLExportAttr>(Attr)) 1990 NewAttr = S.mergeDLLExportAttr(D, ExportA->getRange(), 1991 AttrSpellingListIndex); 1992 else if (FormatAttr *FA = dyn_cast<FormatAttr>(Attr)) 1993 NewAttr = S.mergeFormatAttr(D, FA->getRange(), FA->getType(), 1994 FA->getFormatIdx(), FA->getFirstArg(), 1995 AttrSpellingListIndex); 1996 else if (SectionAttr *SA = dyn_cast<SectionAttr>(Attr)) 1997 NewAttr = S.mergeSectionAttr(D, SA->getRange(), SA->getName(), 1998 AttrSpellingListIndex); 1999 else if (isa<AlignedAttr>(Attr)) 2000 // AlignedAttrs are handled separately, because we need to handle all 2001 // such attributes on a declaration at the same time. 2002 NewAttr = 0; 2003 else if (!DeclHasAttr(D, Attr)) 2004 NewAttr = cast<InheritableAttr>(Attr->clone(S.Context)); 2005 2006 if (NewAttr) { 2007 NewAttr->setInherited(true); 2008 D->addAttr(NewAttr); 2009 return true; 2010 } 2011 2012 return false; 2013 } 2014 2015 static const Decl *getDefinition(const Decl *D) { 2016 if (const TagDecl *TD = dyn_cast<TagDecl>(D)) 2017 return TD->getDefinition(); 2018 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 2019 return VD->getDefinition(); 2020 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 2021 const FunctionDecl* Def; 2022 if (FD->hasBody(Def)) 2023 return Def; 2024 } 2025 return NULL; 2026 } 2027 2028 static bool hasAttribute(const Decl *D, attr::Kind Kind) { 2029 for (Decl::attr_iterator I = D->attr_begin(), E = D->attr_end(); 2030 I != E; ++I) { 2031 Attr *Attribute = *I; 2032 if (Attribute->getKind() == Kind) 2033 return true; 2034 } 2035 return false; 2036 } 2037 2038 /// checkNewAttributesAfterDef - If we already have a definition, check that 2039 /// there are no new attributes in this declaration. 2040 static void checkNewAttributesAfterDef(Sema &S, Decl *New, const Decl *Old) { 2041 if (!New->hasAttrs()) 2042 return; 2043 2044 const Decl *Def = getDefinition(Old); 2045 if (!Def || Def == New) 2046 return; 2047 2048 AttrVec &NewAttributes = New->getAttrs(); 2049 for (unsigned I = 0, E = NewAttributes.size(); I != E;) { 2050 const Attr *NewAttribute = NewAttributes[I]; 2051 if (hasAttribute(Def, NewAttribute->getKind())) { 2052 ++I; 2053 continue; // regular attr merging will take care of validating this. 2054 } 2055 2056 if (isa<C11NoReturnAttr>(NewAttribute)) { 2057 // C's _Noreturn is allowed to be added to a function after it is defined. 2058 ++I; 2059 continue; 2060 } else if (const AlignedAttr *AA = dyn_cast<AlignedAttr>(NewAttribute)) { 2061 if (AA->isAlignas()) { 2062 // C++11 [dcl.align]p6: 2063 // if any declaration of an entity has an alignment-specifier, 2064 // every defining declaration of that entity shall specify an 2065 // equivalent alignment. 2066 // C11 6.7.5/7: 2067 // If the definition of an object does not have an alignment 2068 // specifier, any other declaration of that object shall also 2069 // have no alignment specifier. 2070 S.Diag(Def->getLocation(), diag::err_alignas_missing_on_definition) 2071 << AA->isC11(); 2072 S.Diag(NewAttribute->getLocation(), diag::note_alignas_on_declaration) 2073 << AA->isC11(); 2074 NewAttributes.erase(NewAttributes.begin() + I); 2075 --E; 2076 continue; 2077 } 2078 } 2079 2080 S.Diag(NewAttribute->getLocation(), 2081 diag::warn_attribute_precede_definition); 2082 S.Diag(Def->getLocation(), diag::note_previous_definition); 2083 NewAttributes.erase(NewAttributes.begin() + I); 2084 --E; 2085 } 2086 } 2087 2088 /// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 2089 void Sema::mergeDeclAttributes(NamedDecl *New, Decl *Old, 2090 AvailabilityMergeKind AMK) { 2091 if (!Old->hasAttrs() && !New->hasAttrs()) 2092 return; 2093 2094 // attributes declared post-definition are currently ignored 2095 checkNewAttributesAfterDef(*this, New, Old); 2096 2097 if (!Old->hasAttrs()) 2098 return; 2099 2100 bool foundAny = New->hasAttrs(); 2101 2102 // Ensure that any moving of objects within the allocated map is done before 2103 // we process them. 2104 if (!foundAny) New->setAttrs(AttrVec()); 2105 2106 for (specific_attr_iterator<InheritableAttr> 2107 i = Old->specific_attr_begin<InheritableAttr>(), 2108 e = Old->specific_attr_end<InheritableAttr>(); 2109 i != e; ++i) { 2110 bool Override = false; 2111 // Ignore deprecated/unavailable/availability attributes if requested. 2112 if (isa<DeprecatedAttr>(*i) || 2113 isa<UnavailableAttr>(*i) || 2114 isa<AvailabilityAttr>(*i)) { 2115 switch (AMK) { 2116 case AMK_None: 2117 continue; 2118 2119 case AMK_Redeclaration: 2120 break; 2121 2122 case AMK_Override: 2123 Override = true; 2124 break; 2125 } 2126 } 2127 2128 if (mergeDeclAttribute(*this, New, *i, Override)) 2129 foundAny = true; 2130 } 2131 2132 if (mergeAlignedAttrs(*this, New, Old)) 2133 foundAny = true; 2134 2135 if (!foundAny) New->dropAttrs(); 2136 } 2137 2138 /// mergeParamDeclAttributes - Copy attributes from the old parameter 2139 /// to the new one. 2140 static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 2141 const ParmVarDecl *oldDecl, 2142 Sema &S) { 2143 // C++11 [dcl.attr.depend]p2: 2144 // The first declaration of a function shall specify the 2145 // carries_dependency attribute for its declarator-id if any declaration 2146 // of the function specifies the carries_dependency attribute. 2147 if (newDecl->hasAttr<CarriesDependencyAttr>() && 2148 !oldDecl->hasAttr<CarriesDependencyAttr>()) { 2149 S.Diag(newDecl->getAttr<CarriesDependencyAttr>()->getLocation(), 2150 diag::err_carries_dependency_missing_on_first_decl) << 1/*Param*/; 2151 // Find the first declaration of the parameter. 2152 // FIXME: Should we build redeclaration chains for function parameters? 2153 const FunctionDecl *FirstFD = 2154 cast<FunctionDecl>(oldDecl->getDeclContext())->getFirstDeclaration(); 2155 const ParmVarDecl *FirstVD = 2156 FirstFD->getParamDecl(oldDecl->getFunctionScopeIndex()); 2157 S.Diag(FirstVD->getLocation(), 2158 diag::note_carries_dependency_missing_first_decl) << 1/*Param*/; 2159 } 2160 2161 if (!oldDecl->hasAttrs()) 2162 return; 2163 2164 bool foundAny = newDecl->hasAttrs(); 2165 2166 // Ensure that any moving of objects within the allocated map is 2167 // done before we process them. 2168 if (!foundAny) newDecl->setAttrs(AttrVec()); 2169 2170 for (specific_attr_iterator<InheritableParamAttr> 2171 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 2172 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 2173 if (!DeclHasAttr(newDecl, *i)) { 2174 InheritableAttr *newAttr = 2175 cast<InheritableParamAttr>((*i)->clone(S.Context)); 2176 newAttr->setInherited(true); 2177 newDecl->addAttr(newAttr); 2178 foundAny = true; 2179 } 2180 } 2181 2182 if (!foundAny) newDecl->dropAttrs(); 2183 } 2184 2185 namespace { 2186 2187 /// Used in MergeFunctionDecl to keep track of function parameters in 2188 /// C. 2189 struct GNUCompatibleParamWarning { 2190 ParmVarDecl *OldParm; 2191 ParmVarDecl *NewParm; 2192 QualType PromotedType; 2193 }; 2194 2195 } 2196 2197 /// getSpecialMember - get the special member enum for a method. 2198 Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 2199 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 2200 if (Ctor->isDefaultConstructor()) 2201 return Sema::CXXDefaultConstructor; 2202 2203 if (Ctor->isCopyConstructor()) 2204 return Sema::CXXCopyConstructor; 2205 2206 if (Ctor->isMoveConstructor()) 2207 return Sema::CXXMoveConstructor; 2208 } else if (isa<CXXDestructorDecl>(MD)) { 2209 return Sema::CXXDestructor; 2210 } else if (MD->isCopyAssignmentOperator()) { 2211 return Sema::CXXCopyAssignment; 2212 } else if (MD->isMoveAssignmentOperator()) { 2213 return Sema::CXXMoveAssignment; 2214 } 2215 2216 return Sema::CXXInvalid; 2217 } 2218 2219 /// canRedefineFunction - checks if a function can be redefined. Currently, 2220 /// only extern inline functions can be redefined, and even then only in 2221 /// GNU89 mode. 2222 static bool canRedefineFunction(const FunctionDecl *FD, 2223 const LangOptions& LangOpts) { 2224 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 2225 !LangOpts.CPlusPlus && 2226 FD->isInlineSpecified() && 2227 FD->getStorageClass() == SC_Extern); 2228 } 2229 2230 /// Is the given calling convention the ABI default for the given 2231 /// declaration? 2232 static bool isABIDefaultCC(Sema &S, CallingConv CC, FunctionDecl *D) { 2233 CallingConv ABIDefaultCC; 2234 if (isa<CXXMethodDecl>(D) && cast<CXXMethodDecl>(D)->isInstance()) { 2235 ABIDefaultCC = S.Context.getDefaultCXXMethodCallConv(D->isVariadic()); 2236 } else { 2237 // Free C function or a static method. 2238 ABIDefaultCC = (S.Context.getLangOpts().MRTD ? CC_X86StdCall : CC_C); 2239 } 2240 return ABIDefaultCC == CC; 2241 } 2242 2243 template <typename T> 2244 static bool haveIncompatibleLanguageLinkages(const T *Old, const T *New) { 2245 const DeclContext *DC = Old->getDeclContext(); 2246 if (DC->isRecord()) 2247 return false; 2248 2249 LanguageLinkage OldLinkage = Old->getLanguageLinkage(); 2250 if (OldLinkage == CXXLanguageLinkage && 2251 New->getDeclContext()->isExternCContext()) 2252 return true; 2253 if (OldLinkage == CLanguageLinkage && 2254 New->getDeclContext()->isExternCXXContext()) 2255 return true; 2256 return false; 2257 } 2258 2259 /// MergeFunctionDecl - We just parsed a function 'New' from 2260 /// declarator D which has the same name and scope as a previous 2261 /// declaration 'Old'. Figure out how to resolve this situation, 2262 /// merging decls or emitting diagnostics as appropriate. 2263 /// 2264 /// In C++, New and Old must be declarations that are not 2265 /// overloaded. Use IsOverload to determine whether New and Old are 2266 /// overloaded, and to select the Old declaration that New should be 2267 /// merged with. 2268 /// 2269 /// Returns true if there was an error, false otherwise. 2270 bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) { 2271 // Verify the old decl was also a function. 2272 FunctionDecl *Old = 0; 2273 if (FunctionTemplateDecl *OldFunctionTemplate 2274 = dyn_cast<FunctionTemplateDecl>(OldD)) 2275 Old = OldFunctionTemplate->getTemplatedDecl(); 2276 else 2277 Old = dyn_cast<FunctionDecl>(OldD); 2278 if (!Old) { 2279 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 2280 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 2281 Diag(Shadow->getTargetDecl()->getLocation(), 2282 diag::note_using_decl_target); 2283 Diag(Shadow->getUsingDecl()->getLocation(), 2284 diag::note_using_decl) << 0; 2285 return true; 2286 } 2287 2288 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2289 << New->getDeclName(); 2290 Diag(OldD->getLocation(), diag::note_previous_definition); 2291 return true; 2292 } 2293 2294 // Determine whether the previous declaration was a definition, 2295 // implicit declaration, or a declaration. 2296 diag::kind PrevDiag; 2297 if (Old->isThisDeclarationADefinition()) 2298 PrevDiag = diag::note_previous_definition; 2299 else if (Old->isImplicit()) 2300 PrevDiag = diag::note_previous_implicit_declaration; 2301 else 2302 PrevDiag = diag::note_previous_declaration; 2303 2304 QualType OldQType = Context.getCanonicalType(Old->getType()); 2305 QualType NewQType = Context.getCanonicalType(New->getType()); 2306 2307 // Don't complain about this if we're in GNU89 mode and the old function 2308 // is an extern inline function. 2309 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 2310 New->getStorageClass() == SC_Static && 2311 Old->getStorageClass() != SC_Static && 2312 !canRedefineFunction(Old, getLangOpts())) { 2313 if (getLangOpts().MicrosoftExt) { 2314 Diag(New->getLocation(), diag::warn_static_non_static) << New; 2315 Diag(Old->getLocation(), PrevDiag); 2316 } else { 2317 Diag(New->getLocation(), diag::err_static_non_static) << New; 2318 Diag(Old->getLocation(), PrevDiag); 2319 return true; 2320 } 2321 } 2322 2323 // If a function is first declared with a calling convention, but is 2324 // later declared or defined without one, the second decl assumes the 2325 // calling convention of the first. 2326 // 2327 // It's OK if a function is first declared without a calling convention, 2328 // but is later declared or defined with the default calling convention. 2329 // 2330 // For the new decl, we have to look at the NON-canonical type to tell the 2331 // difference between a function that really doesn't have a calling 2332 // convention and one that is declared cdecl. That's because in 2333 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 2334 // because it is the default calling convention. 2335 // 2336 // Note also that we DO NOT return at this point, because we still have 2337 // other tests to run. 2338 const FunctionType *OldType = cast<FunctionType>(OldQType); 2339 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 2340 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 2341 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 2342 bool RequiresAdjustment = false; 2343 if (OldTypeInfo.getCC() == NewTypeInfo.getCC()) { 2344 // Fast path: nothing to do. 2345 2346 // Inherit the CC from the previous declaration if it was specified 2347 // there but not here. 2348 } else if (NewTypeInfo.getCC() == CC_Default) { 2349 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 2350 RequiresAdjustment = true; 2351 2352 // Don't complain about mismatches when the default CC is 2353 // effectively the same as the explict one. Only Old decl contains correct 2354 // information about storage class of CXXMethod. 2355 } else if (OldTypeInfo.getCC() == CC_Default && 2356 isABIDefaultCC(*this, NewTypeInfo.getCC(), Old)) { 2357 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 2358 RequiresAdjustment = true; 2359 2360 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 2361 NewTypeInfo.getCC())) { 2362 // Calling conventions really aren't compatible, so complain. 2363 Diag(New->getLocation(), diag::err_cconv_change) 2364 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 2365 << (OldTypeInfo.getCC() == CC_Default) 2366 << (OldTypeInfo.getCC() == CC_Default ? "" : 2367 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 2368 Diag(Old->getLocation(), diag::note_previous_declaration); 2369 return true; 2370 } 2371 2372 // FIXME: diagnose the other way around? 2373 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 2374 NewTypeInfo = NewTypeInfo.withNoReturn(true); 2375 RequiresAdjustment = true; 2376 } 2377 2378 // Merge regparm attribute. 2379 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 2380 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 2381 if (NewTypeInfo.getHasRegParm()) { 2382 Diag(New->getLocation(), diag::err_regparm_mismatch) 2383 << NewType->getRegParmType() 2384 << OldType->getRegParmType(); 2385 Diag(Old->getLocation(), diag::note_previous_declaration); 2386 return true; 2387 } 2388 2389 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 2390 RequiresAdjustment = true; 2391 } 2392 2393 // Merge ns_returns_retained attribute. 2394 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 2395 if (NewTypeInfo.getProducesResult()) { 2396 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 2397 Diag(Old->getLocation(), diag::note_previous_declaration); 2398 return true; 2399 } 2400 2401 NewTypeInfo = NewTypeInfo.withProducesResult(true); 2402 RequiresAdjustment = true; 2403 } 2404 2405 if (RequiresAdjustment) { 2406 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 2407 New->setType(QualType(NewType, 0)); 2408 NewQType = Context.getCanonicalType(New->getType()); 2409 } 2410 2411 // If this redeclaration makes the function inline, we may need to add it to 2412 // UndefinedButUsed. 2413 if (!Old->isInlined() && New->isInlined() && 2414 !New->hasAttr<GNUInlineAttr>() && 2415 (getLangOpts().CPlusPlus || !getLangOpts().GNUInline) && 2416 Old->isUsed(false) && 2417 !Old->isDefined() && !New->isThisDeclarationADefinition()) 2418 UndefinedButUsed.insert(std::make_pair(Old->getCanonicalDecl(), 2419 SourceLocation())); 2420 2421 // If this redeclaration makes it newly gnu_inline, we don't want to warn 2422 // about it. 2423 if (New->hasAttr<GNUInlineAttr>() && 2424 Old->isInlined() && !Old->hasAttr<GNUInlineAttr>()) { 2425 UndefinedButUsed.erase(Old->getCanonicalDecl()); 2426 } 2427 2428 if (getLangOpts().CPlusPlus) { 2429 // (C++98 13.1p2): 2430 // Certain function declarations cannot be overloaded: 2431 // -- Function declarations that differ only in the return type 2432 // cannot be overloaded. 2433 QualType OldReturnType = OldType->getResultType(); 2434 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 2435 QualType ResQT; 2436 if (OldReturnType != NewReturnType) { 2437 if (NewReturnType->isObjCObjectPointerType() 2438 && OldReturnType->isObjCObjectPointerType()) 2439 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 2440 if (ResQT.isNull()) { 2441 if (New->isCXXClassMember() && New->isOutOfLine()) 2442 Diag(New->getLocation(), 2443 diag::err_member_def_does_not_match_ret_type) << New; 2444 else 2445 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 2446 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2447 return true; 2448 } 2449 else 2450 NewQType = ResQT; 2451 } 2452 2453 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 2454 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 2455 if (OldMethod && NewMethod) { 2456 // Preserve triviality. 2457 NewMethod->setTrivial(OldMethod->isTrivial()); 2458 2459 // MSVC allows explicit template specialization at class scope: 2460 // 2 CXMethodDecls referring to the same function will be injected. 2461 // We don't want a redeclartion error. 2462 bool IsClassScopeExplicitSpecialization = 2463 OldMethod->isFunctionTemplateSpecialization() && 2464 NewMethod->isFunctionTemplateSpecialization(); 2465 bool isFriend = NewMethod->getFriendObjectKind(); 2466 2467 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 2468 !IsClassScopeExplicitSpecialization) { 2469 // -- Member function declarations with the same name and the 2470 // same parameter types cannot be overloaded if any of them 2471 // is a static member function declaration. 2472 if (OldMethod->isStatic() || NewMethod->isStatic()) { 2473 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 2474 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2475 return true; 2476 } 2477 2478 // C++ [class.mem]p1: 2479 // [...] A member shall not be declared twice in the 2480 // member-specification, except that a nested class or member 2481 // class template can be declared and then later defined. 2482 if (ActiveTemplateInstantiations.empty()) { 2483 unsigned NewDiag; 2484 if (isa<CXXConstructorDecl>(OldMethod)) 2485 NewDiag = diag::err_constructor_redeclared; 2486 else if (isa<CXXDestructorDecl>(NewMethod)) 2487 NewDiag = diag::err_destructor_redeclared; 2488 else if (isa<CXXConversionDecl>(NewMethod)) 2489 NewDiag = diag::err_conv_function_redeclared; 2490 else 2491 NewDiag = diag::err_member_redeclared; 2492 2493 Diag(New->getLocation(), NewDiag); 2494 } else { 2495 Diag(New->getLocation(), diag::err_member_redeclared_in_instantiation) 2496 << New << New->getType(); 2497 } 2498 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2499 2500 // Complain if this is an explicit declaration of a special 2501 // member that was initially declared implicitly. 2502 // 2503 // As an exception, it's okay to befriend such methods in order 2504 // to permit the implicit constructor/destructor/operator calls. 2505 } else if (OldMethod->isImplicit()) { 2506 if (isFriend) { 2507 NewMethod->setImplicit(); 2508 } else { 2509 Diag(NewMethod->getLocation(), 2510 diag::err_definition_of_implicitly_declared_member) 2511 << New << getSpecialMember(OldMethod); 2512 return true; 2513 } 2514 } else if (OldMethod->isExplicitlyDefaulted() && !isFriend) { 2515 Diag(NewMethod->getLocation(), 2516 diag::err_definition_of_explicitly_defaulted_member) 2517 << getSpecialMember(OldMethod); 2518 return true; 2519 } 2520 } 2521 2522 // C++11 [dcl.attr.noreturn]p1: 2523 // The first declaration of a function shall specify the noreturn 2524 // attribute if any declaration of that function specifies the noreturn 2525 // attribute. 2526 if (New->hasAttr<CXX11NoReturnAttr>() && 2527 !Old->hasAttr<CXX11NoReturnAttr>()) { 2528 Diag(New->getAttr<CXX11NoReturnAttr>()->getLocation(), 2529 diag::err_noreturn_missing_on_first_decl); 2530 Diag(Old->getFirstDeclaration()->getLocation(), 2531 diag::note_noreturn_missing_first_decl); 2532 } 2533 2534 // C++11 [dcl.attr.depend]p2: 2535 // The first declaration of a function shall specify the 2536 // carries_dependency attribute for its declarator-id if any declaration 2537 // of the function specifies the carries_dependency attribute. 2538 if (New->hasAttr<CarriesDependencyAttr>() && 2539 !Old->hasAttr<CarriesDependencyAttr>()) { 2540 Diag(New->getAttr<CarriesDependencyAttr>()->getLocation(), 2541 diag::err_carries_dependency_missing_on_first_decl) << 0/*Function*/; 2542 Diag(Old->getFirstDeclaration()->getLocation(), 2543 diag::note_carries_dependency_missing_first_decl) << 0/*Function*/; 2544 } 2545 2546 // (C++98 8.3.5p3): 2547 // All declarations for a function shall agree exactly in both the 2548 // return type and the parameter-type-list. 2549 // We also want to respect all the extended bits except noreturn. 2550 2551 // noreturn should now match unless the old type info didn't have it. 2552 QualType OldQTypeForComparison = OldQType; 2553 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 2554 assert(OldQType == QualType(OldType, 0)); 2555 const FunctionType *OldTypeForComparison 2556 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 2557 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 2558 assert(OldQTypeForComparison.isCanonical()); 2559 } 2560 2561 if (haveIncompatibleLanguageLinkages(Old, New)) { 2562 Diag(New->getLocation(), diag::err_different_language_linkage) << New; 2563 Diag(Old->getLocation(), PrevDiag); 2564 return true; 2565 } 2566 2567 if (OldQTypeForComparison == NewQType) 2568 return MergeCompatibleFunctionDecls(New, Old, S); 2569 2570 // Fall through for conflicting redeclarations and redefinitions. 2571 } 2572 2573 // C: Function types need to be compatible, not identical. This handles 2574 // duplicate function decls like "void f(int); void f(enum X);" properly. 2575 if (!getLangOpts().CPlusPlus && 2576 Context.typesAreCompatible(OldQType, NewQType)) { 2577 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 2578 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 2579 const FunctionProtoType *OldProto = 0; 2580 if (isa<FunctionNoProtoType>(NewFuncType) && 2581 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 2582 // The old declaration provided a function prototype, but the 2583 // new declaration does not. Merge in the prototype. 2584 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 2585 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 2586 OldProto->arg_type_end()); 2587 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 2588 ParamTypes, 2589 OldProto->getExtProtoInfo()); 2590 New->setType(NewQType); 2591 New->setHasInheritedPrototype(); 2592 2593 // Synthesize a parameter for each argument type. 2594 SmallVector<ParmVarDecl*, 16> Params; 2595 for (FunctionProtoType::arg_type_iterator 2596 ParamType = OldProto->arg_type_begin(), 2597 ParamEnd = OldProto->arg_type_end(); 2598 ParamType != ParamEnd; ++ParamType) { 2599 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 2600 SourceLocation(), 2601 SourceLocation(), 0, 2602 *ParamType, /*TInfo=*/0, 2603 SC_None, SC_None, 2604 0); 2605 Param->setScopeInfo(0, Params.size()); 2606 Param->setImplicit(); 2607 Params.push_back(Param); 2608 } 2609 2610 New->setParams(Params); 2611 } 2612 2613 return MergeCompatibleFunctionDecls(New, Old, S); 2614 } 2615 2616 // GNU C permits a K&R definition to follow a prototype declaration 2617 // if the declared types of the parameters in the K&R definition 2618 // match the types in the prototype declaration, even when the 2619 // promoted types of the parameters from the K&R definition differ 2620 // from the types in the prototype. GCC then keeps the types from 2621 // the prototype. 2622 // 2623 // If a variadic prototype is followed by a non-variadic K&R definition, 2624 // the K&R definition becomes variadic. This is sort of an edge case, but 2625 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2626 // C99 6.9.1p8. 2627 if (!getLangOpts().CPlusPlus && 2628 Old->hasPrototype() && !New->hasPrototype() && 2629 New->getType()->getAs<FunctionProtoType>() && 2630 Old->getNumParams() == New->getNumParams()) { 2631 SmallVector<QualType, 16> ArgTypes; 2632 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2633 const FunctionProtoType *OldProto 2634 = Old->getType()->getAs<FunctionProtoType>(); 2635 const FunctionProtoType *NewProto 2636 = New->getType()->getAs<FunctionProtoType>(); 2637 2638 // Determine whether this is the GNU C extension. 2639 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2640 NewProto->getResultType()); 2641 bool LooseCompatible = !MergedReturn.isNull(); 2642 for (unsigned Idx = 0, End = Old->getNumParams(); 2643 LooseCompatible && Idx != End; ++Idx) { 2644 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2645 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2646 if (Context.typesAreCompatible(OldParm->getType(), 2647 NewProto->getArgType(Idx))) { 2648 ArgTypes.push_back(NewParm->getType()); 2649 } else if (Context.typesAreCompatible(OldParm->getType(), 2650 NewParm->getType(), 2651 /*CompareUnqualified=*/true)) { 2652 GNUCompatibleParamWarning Warn 2653 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2654 Warnings.push_back(Warn); 2655 ArgTypes.push_back(NewParm->getType()); 2656 } else 2657 LooseCompatible = false; 2658 } 2659 2660 if (LooseCompatible) { 2661 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2662 Diag(Warnings[Warn].NewParm->getLocation(), 2663 diag::ext_param_promoted_not_compatible_with_prototype) 2664 << Warnings[Warn].PromotedType 2665 << Warnings[Warn].OldParm->getType(); 2666 if (Warnings[Warn].OldParm->getLocation().isValid()) 2667 Diag(Warnings[Warn].OldParm->getLocation(), 2668 diag::note_previous_declaration); 2669 } 2670 2671 New->setType(Context.getFunctionType(MergedReturn, ArgTypes, 2672 OldProto->getExtProtoInfo())); 2673 return MergeCompatibleFunctionDecls(New, Old, S); 2674 } 2675 2676 // Fall through to diagnose conflicting types. 2677 } 2678 2679 // A function that has already been declared has been redeclared or defined 2680 // with a different type- show appropriate diagnostic 2681 if (unsigned BuiltinID = Old->getBuiltinID()) { 2682 // The user has declared a builtin function with an incompatible 2683 // signature. 2684 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2685 // The function the user is redeclaring is a library-defined 2686 // function like 'malloc' or 'printf'. Warn about the 2687 // redeclaration, then pretend that we don't know about this 2688 // library built-in. 2689 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2690 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2691 << Old << Old->getType(); 2692 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2693 Old->setInvalidDecl(); 2694 return false; 2695 } 2696 2697 PrevDiag = diag::note_previous_builtin_declaration; 2698 } 2699 2700 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2701 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2702 return true; 2703 } 2704 2705 /// \brief Completes the merge of two function declarations that are 2706 /// known to be compatible. 2707 /// 2708 /// This routine handles the merging of attributes and other 2709 /// properties of function declarations form the old declaration to 2710 /// the new declaration, once we know that New is in fact a 2711 /// redeclaration of Old. 2712 /// 2713 /// \returns false 2714 bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old, 2715 Scope *S) { 2716 // Merge the attributes 2717 mergeDeclAttributes(New, Old); 2718 2719 // Merge the storage class. 2720 if (Old->getStorageClass() != SC_Extern && 2721 Old->getStorageClass() != SC_None) 2722 New->setStorageClass(Old->getStorageClass()); 2723 2724 // Merge "pure" flag. 2725 if (Old->isPure()) 2726 New->setPure(); 2727 2728 // Merge "used" flag. 2729 if (Old->isUsed(false)) 2730 New->setUsed(); 2731 2732 // Merge attributes from the parameters. These can mismatch with K&R 2733 // declarations. 2734 if (New->getNumParams() == Old->getNumParams()) 2735 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2736 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2737 *this); 2738 2739 if (getLangOpts().CPlusPlus) 2740 return MergeCXXFunctionDecl(New, Old, S); 2741 2742 // Merge the function types so the we get the composite types for the return 2743 // and argument types. 2744 QualType Merged = Context.mergeTypes(Old->getType(), New->getType()); 2745 if (!Merged.isNull()) 2746 New->setType(Merged); 2747 2748 return false; 2749 } 2750 2751 2752 void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2753 ObjCMethodDecl *oldMethod) { 2754 2755 // Merge the attributes, including deprecated/unavailable 2756 mergeDeclAttributes(newMethod, oldMethod, AMK_Override); 2757 2758 // Merge attributes from the parameters. 2759 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(), 2760 oe = oldMethod->param_end(); 2761 for (ObjCMethodDecl::param_iterator 2762 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2763 ni != ne && oi != oe; ++ni, ++oi) 2764 mergeParamDeclAttributes(*ni, *oi, *this); 2765 2766 CheckObjCMethodOverride(newMethod, oldMethod); 2767 } 2768 2769 /// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2770 /// scope as a previous declaration 'Old'. Figure out how to merge their types, 2771 /// emitting diagnostics as appropriate. 2772 /// 2773 /// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2774 /// to here in AddInitializerToDecl. We can't check them before the initializer 2775 /// is attached. 2776 void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2777 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2778 return; 2779 2780 QualType MergedT; 2781 if (getLangOpts().CPlusPlus) { 2782 AutoType *AT = New->getType()->getContainedAutoType(); 2783 if (AT && !AT->isDeduced()) { 2784 // We don't know what the new type is until the initializer is attached. 2785 return; 2786 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2787 // These could still be something that needs exception specs checked. 2788 return MergeVarDeclExceptionSpecs(New, Old); 2789 } 2790 // C++ [basic.link]p10: 2791 // [...] the types specified by all declarations referring to a given 2792 // object or function shall be identical, except that declarations for an 2793 // array object can specify array types that differ by the presence or 2794 // absence of a major array bound (8.3.4). 2795 else if (Old->getType()->isIncompleteArrayType() && 2796 New->getType()->isArrayType()) { 2797 const ArrayType *OldArray = Context.getAsArrayType(Old->getType()); 2798 const ArrayType *NewArray = Context.getAsArrayType(New->getType()); 2799 if (Context.hasSameType(OldArray->getElementType(), 2800 NewArray->getElementType())) 2801 MergedT = New->getType(); 2802 } else if (Old->getType()->isArrayType() && 2803 New->getType()->isIncompleteArrayType()) { 2804 const ArrayType *OldArray = Context.getAsArrayType(Old->getType()); 2805 const ArrayType *NewArray = Context.getAsArrayType(New->getType()); 2806 if (Context.hasSameType(OldArray->getElementType(), 2807 NewArray->getElementType())) 2808 MergedT = Old->getType(); 2809 } else if (New->getType()->isObjCObjectPointerType() 2810 && Old->getType()->isObjCObjectPointerType()) { 2811 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2812 Old->getType()); 2813 } 2814 } else { 2815 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2816 } 2817 if (MergedT.isNull()) { 2818 Diag(New->getLocation(), diag::err_redefinition_different_type) 2819 << New->getDeclName() << New->getType() << Old->getType(); 2820 Diag(Old->getLocation(), diag::note_previous_definition); 2821 return New->setInvalidDecl(); 2822 } 2823 New->setType(MergedT); 2824 } 2825 2826 /// MergeVarDecl - We just parsed a variable 'New' which has the same name 2827 /// and scope as a previous declaration 'Old'. Figure out how to resolve this 2828 /// situation, merging decls or emitting diagnostics as appropriate. 2829 /// 2830 /// Tentative definition rules (C99 6.9.2p2) are checked by 2831 /// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2832 /// definitions here, since the initializer hasn't been attached. 2833 /// 2834 void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2835 // If the new decl is already invalid, don't do any other checking. 2836 if (New->isInvalidDecl()) 2837 return; 2838 2839 // Verify the old decl was also a variable. 2840 VarDecl *Old = 0; 2841 if (!Previous.isSingleResult() || 2842 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2843 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2844 << New->getDeclName(); 2845 Diag(Previous.getRepresentativeDecl()->getLocation(), 2846 diag::note_previous_definition); 2847 return New->setInvalidDecl(); 2848 } 2849 2850 // C++ [class.mem]p1: 2851 // A member shall not be declared twice in the member-specification [...] 2852 // 2853 // Here, we need only consider static data members. 2854 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2855 Diag(New->getLocation(), diag::err_duplicate_member) 2856 << New->getIdentifier(); 2857 Diag(Old->getLocation(), diag::note_previous_declaration); 2858 New->setInvalidDecl(); 2859 } 2860 2861 mergeDeclAttributes(New, Old); 2862 // Warn if an already-declared variable is made a weak_import in a subsequent 2863 // declaration 2864 if (New->getAttr<WeakImportAttr>() && 2865 Old->getStorageClass() == SC_None && 2866 !Old->getAttr<WeakImportAttr>()) { 2867 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2868 Diag(Old->getLocation(), diag::note_previous_definition); 2869 // Remove weak_import attribute on new declaration. 2870 New->dropAttr<WeakImportAttr>(); 2871 } 2872 2873 // Merge the types. 2874 MergeVarDeclTypes(New, Old); 2875 if (New->isInvalidDecl()) 2876 return; 2877 2878 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2879 if (New->getStorageClass() == SC_Static && 2880 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2881 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2882 Diag(Old->getLocation(), diag::note_previous_definition); 2883 return New->setInvalidDecl(); 2884 } 2885 // C99 6.2.2p4: 2886 // For an identifier declared with the storage-class specifier 2887 // extern in a scope in which a prior declaration of that 2888 // identifier is visible,23) if the prior declaration specifies 2889 // internal or external linkage, the linkage of the identifier at 2890 // the later declaration is the same as the linkage specified at 2891 // the prior declaration. If no prior declaration is visible, or 2892 // if the prior declaration specifies no linkage, then the 2893 // identifier has external linkage. 2894 if (New->hasExternalStorage() && Old->hasLinkage()) 2895 /* Okay */; 2896 else if (New->getStorageClass() != SC_Static && 2897 Old->getStorageClass() == SC_Static) { 2898 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2899 Diag(Old->getLocation(), diag::note_previous_definition); 2900 return New->setInvalidDecl(); 2901 } 2902 2903 // Check if extern is followed by non-extern and vice-versa. 2904 if (New->hasExternalStorage() && 2905 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2906 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2907 Diag(Old->getLocation(), diag::note_previous_definition); 2908 return New->setInvalidDecl(); 2909 } 2910 if (Old->hasExternalStorage() && 2911 New->isLocalVarDecl() && !New->hasLinkage()) { 2912 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2913 Diag(Old->getLocation(), diag::note_previous_definition); 2914 return New->setInvalidDecl(); 2915 } 2916 2917 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2918 2919 // FIXME: The test for external storage here seems wrong? We still 2920 // need to check for mismatches. 2921 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2922 // Don't complain about out-of-line definitions of static members. 2923 !(Old->getLexicalDeclContext()->isRecord() && 2924 !New->getLexicalDeclContext()->isRecord())) { 2925 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2926 Diag(Old->getLocation(), diag::note_previous_definition); 2927 return New->setInvalidDecl(); 2928 } 2929 2930 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2931 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2932 Diag(Old->getLocation(), diag::note_previous_definition); 2933 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2934 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2935 Diag(Old->getLocation(), diag::note_previous_definition); 2936 } 2937 2938 // C++ doesn't have tentative definitions, so go right ahead and check here. 2939 const VarDecl *Def; 2940 if (getLangOpts().CPlusPlus && 2941 New->isThisDeclarationADefinition() == VarDecl::Definition && 2942 (Def = Old->getDefinition())) { 2943 Diag(New->getLocation(), diag::err_redefinition) 2944 << New->getDeclName(); 2945 Diag(Def->getLocation(), diag::note_previous_definition); 2946 New->setInvalidDecl(); 2947 return; 2948 } 2949 2950 if (haveIncompatibleLanguageLinkages(Old, New)) { 2951 Diag(New->getLocation(), diag::err_different_language_linkage) << New; 2952 Diag(Old->getLocation(), diag::note_previous_definition); 2953 New->setInvalidDecl(); 2954 return; 2955 } 2956 2957 // c99 6.2.2 P4. 2958 // For an identifier declared with the storage-class specifier extern in a 2959 // scope in which a prior declaration of that identifier is visible, if 2960 // the prior declaration specifies internal or external linkage, the linkage 2961 // of the identifier at the later declaration is the same as the linkage 2962 // specified at the prior declaration. 2963 // FIXME. revisit this code. 2964 if (New->hasExternalStorage() && 2965 Old->getLinkage() == InternalLinkage) 2966 New->setStorageClass(Old->getStorageClass()); 2967 2968 // Merge "used" flag. 2969 if (Old->isUsed(false)) 2970 New->setUsed(); 2971 2972 // Keep a chain of previous declarations. 2973 New->setPreviousDeclaration(Old); 2974 2975 // Inherit access appropriately. 2976 New->setAccess(Old->getAccess()); 2977 } 2978 2979 /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2980 /// no declarator (e.g. "struct foo;") is parsed. 2981 Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2982 DeclSpec &DS) { 2983 return ParsedFreeStandingDeclSpec(S, AS, DS, MultiTemplateParamsArg()); 2984 } 2985 2986 /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2987 /// no declarator (e.g. "struct foo;") is parsed. It also accepts template 2988 /// parameters to cope with template friend declarations. 2989 Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2990 DeclSpec &DS, 2991 MultiTemplateParamsArg TemplateParams, 2992 bool IsExplicitInstantiation) { 2993 Decl *TagD = 0; 2994 TagDecl *Tag = 0; 2995 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2996 DS.getTypeSpecType() == DeclSpec::TST_struct || 2997 DS.getTypeSpecType() == DeclSpec::TST_interface || 2998 DS.getTypeSpecType() == DeclSpec::TST_union || 2999 DS.getTypeSpecType() == DeclSpec::TST_enum) { 3000 TagD = DS.getRepAsDecl(); 3001 3002 if (!TagD) // We probably had an error 3003 return 0; 3004 3005 // Note that the above type specs guarantee that the 3006 // type rep is a Decl, whereas in many of the others 3007 // it's a Type. 3008 if (isa<TagDecl>(TagD)) 3009 Tag = cast<TagDecl>(TagD); 3010 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 3011 Tag = CTD->getTemplatedDecl(); 3012 } 3013 3014 if (Tag) { 3015 getASTContext().addUnnamedTag(Tag); 3016 Tag->setFreeStanding(); 3017 if (Tag->isInvalidDecl()) 3018 return Tag; 3019 } 3020 3021 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 3022 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 3023 // or incomplete types shall not be restrict-qualified." 3024 if (TypeQuals & DeclSpec::TQ_restrict) 3025 Diag(DS.getRestrictSpecLoc(), 3026 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 3027 << DS.getSourceRange(); 3028 } 3029 3030 if (DS.isConstexprSpecified()) { 3031 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 3032 // and definitions of functions and variables. 3033 if (Tag) 3034 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 3035 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 3036 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 3037 DS.getTypeSpecType() == DeclSpec::TST_interface ? 2 : 3038 DS.getTypeSpecType() == DeclSpec::TST_union ? 3 : 4); 3039 else 3040 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 3041 // Don't emit warnings after this error. 3042 return TagD; 3043 } 3044 3045 DiagnoseFunctionSpecifiers(DS); 3046 3047 if (DS.isFriendSpecified()) { 3048 // If we're dealing with a decl but not a TagDecl, assume that 3049 // whatever routines created it handled the friendship aspect. 3050 if (TagD && !Tag) 3051 return 0; 3052 return ActOnFriendTypeDecl(S, DS, TemplateParams); 3053 } 3054 3055 CXXScopeSpec &SS = DS.getTypeSpecScope(); 3056 bool IsExplicitSpecialization = 3057 !TemplateParams.empty() && TemplateParams.back()->size() == 0; 3058 if (Tag && SS.isNotEmpty() && !Tag->isCompleteDefinition() && 3059 !IsExplicitInstantiation && !IsExplicitSpecialization) { 3060 // Per C++ [dcl.type.elab]p1, a class declaration cannot have a 3061 // nested-name-specifier unless it is an explicit instantiation 3062 // or an explicit specialization. 3063 // Per C++ [dcl.enum]p1, an opaque-enum-declaration can't either. 3064 Diag(SS.getBeginLoc(), diag::err_standalone_class_nested_name_specifier) 3065 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 3066 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 3067 DS.getTypeSpecType() == DeclSpec::TST_interface ? 2 : 3068 DS.getTypeSpecType() == DeclSpec::TST_union ? 3 : 4) 3069 << SS.getRange(); 3070 return 0; 3071 } 3072 3073 // Track whether this decl-specifier declares anything. 3074 bool DeclaresAnything = true; 3075 3076 // Handle anonymous struct definitions. 3077 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 3078 if (!Record->getDeclName() && Record->isCompleteDefinition() && 3079 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 3080 if (getLangOpts().CPlusPlus || 3081 Record->getDeclContext()->isRecord()) 3082 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 3083 3084 DeclaresAnything = false; 3085 } 3086 } 3087 3088 // Check for Microsoft C extension: anonymous struct member. 3089 if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus && 3090 CurContext->isRecord() && 3091 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 3092 // Handle 2 kinds of anonymous struct: 3093 // struct STRUCT; 3094 // and 3095 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 3096 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 3097 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 3098 (DS.getTypeSpecType() == DeclSpec::TST_typename && 3099 DS.getRepAsType().get()->isStructureType())) { 3100 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct) 3101 << DS.getSourceRange(); 3102 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 3103 } 3104 } 3105 3106 // Skip all the checks below if we have a type error. 3107 if (DS.getTypeSpecType() == DeclSpec::TST_error || 3108 (TagD && TagD->isInvalidDecl())) 3109 return TagD; 3110 3111 if (getLangOpts().CPlusPlus && 3112 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 3113 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 3114 if (Enum->enumerator_begin() == Enum->enumerator_end() && 3115 !Enum->getIdentifier() && !Enum->isInvalidDecl()) 3116 DeclaresAnything = false; 3117 3118 if (!DS.isMissingDeclaratorOk()) { 3119 // Customize diagnostic for a typedef missing a name. 3120 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) 3121 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name) 3122 << DS.getSourceRange(); 3123 else 3124 DeclaresAnything = false; 3125 } 3126 3127 if (DS.isModulePrivateSpecified() && 3128 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 3129 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 3130 << Tag->getTagKind() 3131 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 3132 3133 ActOnDocumentableDecl(TagD); 3134 3135 // C 6.7/2: 3136 // A declaration [...] shall declare at least a declarator [...], a tag, 3137 // or the members of an enumeration. 3138 // C++ [dcl.dcl]p3: 3139 // [If there are no declarators], and except for the declaration of an 3140 // unnamed bit-field, the decl-specifier-seq shall introduce one or more 3141 // names into the program, or shall redeclare a name introduced by a 3142 // previous declaration. 3143 if (!DeclaresAnything) { 3144 // In C, we allow this as a (popular) extension / bug. Don't bother 3145 // producing further diagnostics for redundant qualifiers after this. 3146 Diag(DS.getLocStart(), diag::ext_no_declarators) << DS.getSourceRange(); 3147 return TagD; 3148 } 3149 3150 // C++ [dcl.stc]p1: 3151 // If a storage-class-specifier appears in a decl-specifier-seq, [...] the 3152 // init-declarator-list of the declaration shall not be empty. 3153 // C++ [dcl.fct.spec]p1: 3154 // If a cv-qualifier appears in a decl-specifier-seq, the 3155 // init-declarator-list of the declaration shall not be empty. 3156 // 3157 // Spurious qualifiers here appear to be valid in C. 3158 unsigned DiagID = diag::warn_standalone_specifier; 3159 if (getLangOpts().CPlusPlus) 3160 DiagID = diag::ext_standalone_specifier; 3161 3162 // Note that a linkage-specification sets a storage class, but 3163 // 'extern "C" struct foo;' is actually valid and not theoretically 3164 // useless. 3165 if (DeclSpec::SCS SCS = DS.getStorageClassSpec()) 3166 if (!DS.isExternInLinkageSpec() && SCS != DeclSpec::SCS_typedef) 3167 Diag(DS.getStorageClassSpecLoc(), DiagID) 3168 << DeclSpec::getSpecifierName(SCS); 3169 3170 if (DS.isThreadSpecified()) 3171 Diag(DS.getThreadSpecLoc(), DiagID) << "__thread"; 3172 if (DS.getTypeQualifiers()) { 3173 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 3174 Diag(DS.getConstSpecLoc(), DiagID) << "const"; 3175 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 3176 Diag(DS.getConstSpecLoc(), DiagID) << "volatile"; 3177 // Restrict is covered above. 3178 } 3179 3180 // Warn about ignored type attributes, for example: 3181 // __attribute__((aligned)) struct A; 3182 // Attributes should be placed after tag to apply to type declaration. 3183 if (!DS.getAttributes().empty()) { 3184 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 3185 if (TypeSpecType == DeclSpec::TST_class || 3186 TypeSpecType == DeclSpec::TST_struct || 3187 TypeSpecType == DeclSpec::TST_interface || 3188 TypeSpecType == DeclSpec::TST_union || 3189 TypeSpecType == DeclSpec::TST_enum) { 3190 AttributeList* attrs = DS.getAttributes().getList(); 3191 while (attrs) { 3192 Diag(attrs->getLoc(), diag::warn_declspec_attribute_ignored) 3193 << attrs->getName() 3194 << (TypeSpecType == DeclSpec::TST_class ? 0 : 3195 TypeSpecType == DeclSpec::TST_struct ? 1 : 3196 TypeSpecType == DeclSpec::TST_union ? 2 : 3197 TypeSpecType == DeclSpec::TST_interface ? 3 : 4); 3198 attrs = attrs->getNext(); 3199 } 3200 } 3201 } 3202 3203 return TagD; 3204 } 3205 3206 /// We are trying to inject an anonymous member into the given scope; 3207 /// check if there's an existing declaration that can't be overloaded. 3208 /// 3209 /// \return true if this is a forbidden redeclaration 3210 static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 3211 Scope *S, 3212 DeclContext *Owner, 3213 DeclarationName Name, 3214 SourceLocation NameLoc, 3215 unsigned diagnostic) { 3216 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 3217 Sema::ForRedeclaration); 3218 if (!SemaRef.LookupName(R, S)) return false; 3219 3220 if (R.getAsSingle<TagDecl>()) 3221 return false; 3222 3223 // Pick a representative declaration. 3224 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 3225 assert(PrevDecl && "Expected a non-null Decl"); 3226 3227 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 3228 return false; 3229 3230 SemaRef.Diag(NameLoc, diagnostic) << Name; 3231 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3232 3233 return true; 3234 } 3235 3236 /// InjectAnonymousStructOrUnionMembers - Inject the members of the 3237 /// anonymous struct or union AnonRecord into the owning context Owner 3238 /// and scope S. This routine will be invoked just after we realize 3239 /// that an unnamed union or struct is actually an anonymous union or 3240 /// struct, e.g., 3241 /// 3242 /// @code 3243 /// union { 3244 /// int i; 3245 /// float f; 3246 /// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 3247 /// // f into the surrounding scope.x 3248 /// @endcode 3249 /// 3250 /// This routine is recursive, injecting the names of nested anonymous 3251 /// structs/unions into the owning context and scope as well. 3252 static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 3253 DeclContext *Owner, 3254 RecordDecl *AnonRecord, 3255 AccessSpecifier AS, 3256 SmallVector<NamedDecl*, 2> &Chaining, 3257 bool MSAnonStruct) { 3258 unsigned diagKind 3259 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 3260 : diag::err_anonymous_struct_member_redecl; 3261 3262 bool Invalid = false; 3263 3264 // Look every FieldDecl and IndirectFieldDecl with a name. 3265 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 3266 DEnd = AnonRecord->decls_end(); 3267 D != DEnd; ++D) { 3268 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 3269 cast<NamedDecl>(*D)->getDeclName()) { 3270 ValueDecl *VD = cast<ValueDecl>(*D); 3271 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 3272 VD->getLocation(), diagKind)) { 3273 // C++ [class.union]p2: 3274 // The names of the members of an anonymous union shall be 3275 // distinct from the names of any other entity in the 3276 // scope in which the anonymous union is declared. 3277 Invalid = true; 3278 } else { 3279 // C++ [class.union]p2: 3280 // For the purpose of name lookup, after the anonymous union 3281 // definition, the members of the anonymous union are 3282 // considered to have been defined in the scope in which the 3283 // anonymous union is declared. 3284 unsigned OldChainingSize = Chaining.size(); 3285 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 3286 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 3287 PE = IF->chain_end(); PI != PE; ++PI) 3288 Chaining.push_back(*PI); 3289 else 3290 Chaining.push_back(VD); 3291 3292 assert(Chaining.size() >= 2); 3293 NamedDecl **NamedChain = 3294 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 3295 for (unsigned i = 0; i < Chaining.size(); i++) 3296 NamedChain[i] = Chaining[i]; 3297 3298 IndirectFieldDecl* IndirectField = 3299 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 3300 VD->getIdentifier(), VD->getType(), 3301 NamedChain, Chaining.size()); 3302 3303 IndirectField->setAccess(AS); 3304 IndirectField->setImplicit(); 3305 SemaRef.PushOnScopeChains(IndirectField, S); 3306 3307 // That includes picking up the appropriate access specifier. 3308 if (AS != AS_none) IndirectField->setAccess(AS); 3309 3310 Chaining.resize(OldChainingSize); 3311 } 3312 } 3313 } 3314 3315 return Invalid; 3316 } 3317 3318 /// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 3319 /// a VarDecl::StorageClass. Any error reporting is up to the caller: 3320 /// illegal input values are mapped to SC_None. 3321 static StorageClass 3322 StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 3323 switch (StorageClassSpec) { 3324 case DeclSpec::SCS_unspecified: return SC_None; 3325 case DeclSpec::SCS_extern: return SC_Extern; 3326 case DeclSpec::SCS_static: return SC_Static; 3327 case DeclSpec::SCS_auto: return SC_Auto; 3328 case DeclSpec::SCS_register: return SC_Register; 3329 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 3330 // Illegal SCSs map to None: error reporting is up to the caller. 3331 case DeclSpec::SCS_mutable: // Fall through. 3332 case DeclSpec::SCS_typedef: return SC_None; 3333 } 3334 llvm_unreachable("unknown storage class specifier"); 3335 } 3336 3337 /// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 3338 /// a StorageClass. Any error reporting is up to the caller: 3339 /// illegal input values are mapped to SC_None. 3340 static StorageClass 3341 StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 3342 switch (StorageClassSpec) { 3343 case DeclSpec::SCS_unspecified: return SC_None; 3344 case DeclSpec::SCS_extern: return SC_Extern; 3345 case DeclSpec::SCS_static: return SC_Static; 3346 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 3347 // Illegal SCSs map to None: error reporting is up to the caller. 3348 case DeclSpec::SCS_auto: // Fall through. 3349 case DeclSpec::SCS_mutable: // Fall through. 3350 case DeclSpec::SCS_register: // Fall through. 3351 case DeclSpec::SCS_typedef: return SC_None; 3352 } 3353 llvm_unreachable("unknown storage class specifier"); 3354 } 3355 3356 /// BuildAnonymousStructOrUnion - Handle the declaration of an 3357 /// anonymous structure or union. Anonymous unions are a C++ feature 3358 /// (C++ [class.union]) and a C11 feature; anonymous structures 3359 /// are a C11 feature and GNU C++ extension. 3360 Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 3361 AccessSpecifier AS, 3362 RecordDecl *Record) { 3363 DeclContext *Owner = Record->getDeclContext(); 3364 3365 // Diagnose whether this anonymous struct/union is an extension. 3366 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11) 3367 Diag(Record->getLocation(), diag::ext_anonymous_union); 3368 else if (!Record->isUnion() && getLangOpts().CPlusPlus) 3369 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 3370 else if (!Record->isUnion() && !getLangOpts().C11) 3371 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 3372 3373 // C and C++ require different kinds of checks for anonymous 3374 // structs/unions. 3375 bool Invalid = false; 3376 if (getLangOpts().CPlusPlus) { 3377 const char* PrevSpec = 0; 3378 unsigned DiagID; 3379 if (Record->isUnion()) { 3380 // C++ [class.union]p6: 3381 // Anonymous unions declared in a named namespace or in the 3382 // global namespace shall be declared static. 3383 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 3384 (isa<TranslationUnitDecl>(Owner) || 3385 (isa<NamespaceDecl>(Owner) && 3386 cast<NamespaceDecl>(Owner)->getDeclName()))) { 3387 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 3388 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 3389 3390 // Recover by adding 'static'. 3391 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 3392 PrevSpec, DiagID); 3393 } 3394 // C++ [class.union]p6: 3395 // A storage class is not allowed in a declaration of an 3396 // anonymous union in a class scope. 3397 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 3398 isa<RecordDecl>(Owner)) { 3399 Diag(DS.getStorageClassSpecLoc(), 3400 diag::err_anonymous_union_with_storage_spec) 3401 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 3402 3403 // Recover by removing the storage specifier. 3404 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 3405 SourceLocation(), 3406 PrevSpec, DiagID); 3407 } 3408 } 3409 3410 // Ignore const/volatile/restrict qualifiers. 3411 if (DS.getTypeQualifiers()) { 3412 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 3413 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 3414 << Record->isUnion() << 0 3415 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 3416 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 3417 Diag(DS.getVolatileSpecLoc(), 3418 diag::ext_anonymous_struct_union_qualified) 3419 << Record->isUnion() << 1 3420 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 3421 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 3422 Diag(DS.getRestrictSpecLoc(), 3423 diag::ext_anonymous_struct_union_qualified) 3424 << Record->isUnion() << 2 3425 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 3426 3427 DS.ClearTypeQualifiers(); 3428 } 3429 3430 // C++ [class.union]p2: 3431 // The member-specification of an anonymous union shall only 3432 // define non-static data members. [Note: nested types and 3433 // functions cannot be declared within an anonymous union. ] 3434 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 3435 MemEnd = Record->decls_end(); 3436 Mem != MemEnd; ++Mem) { 3437 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 3438 // C++ [class.union]p3: 3439 // An anonymous union shall not have private or protected 3440 // members (clause 11). 3441 assert(FD->getAccess() != AS_none); 3442 if (FD->getAccess() != AS_public) { 3443 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 3444 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 3445 Invalid = true; 3446 } 3447 3448 // C++ [class.union]p1 3449 // An object of a class with a non-trivial constructor, a non-trivial 3450 // copy constructor, a non-trivial destructor, or a non-trivial copy 3451 // assignment operator cannot be a member of a union, nor can an 3452 // array of such objects. 3453 if (CheckNontrivialField(FD)) 3454 Invalid = true; 3455 } else if ((*Mem)->isImplicit()) { 3456 // Any implicit members are fine. 3457 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 3458 // This is a type that showed up in an 3459 // elaborated-type-specifier inside the anonymous struct or 3460 // union, but which actually declares a type outside of the 3461 // anonymous struct or union. It's okay. 3462 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 3463 if (!MemRecord->isAnonymousStructOrUnion() && 3464 MemRecord->getDeclName()) { 3465 // Visual C++ allows type definition in anonymous struct or union. 3466 if (getLangOpts().MicrosoftExt) 3467 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 3468 << (int)Record->isUnion(); 3469 else { 3470 // This is a nested type declaration. 3471 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 3472 << (int)Record->isUnion(); 3473 Invalid = true; 3474 } 3475 } else { 3476 // This is an anonymous type definition within another anonymous type. 3477 // This is a popular extension, provided by Plan9, MSVC and GCC, but 3478 // not part of standard C++. 3479 Diag(MemRecord->getLocation(), 3480 diag::ext_anonymous_record_with_anonymous_type) 3481 << (int)Record->isUnion(); 3482 } 3483 } else if (isa<AccessSpecDecl>(*Mem)) { 3484 // Any access specifier is fine. 3485 } else { 3486 // We have something that isn't a non-static data 3487 // member. Complain about it. 3488 unsigned DK = diag::err_anonymous_record_bad_member; 3489 if (isa<TypeDecl>(*Mem)) 3490 DK = diag::err_anonymous_record_with_type; 3491 else if (isa<FunctionDecl>(*Mem)) 3492 DK = diag::err_anonymous_record_with_function; 3493 else if (isa<VarDecl>(*Mem)) 3494 DK = diag::err_anonymous_record_with_static; 3495 3496 // Visual C++ allows type definition in anonymous struct or union. 3497 if (getLangOpts().MicrosoftExt && 3498 DK == diag::err_anonymous_record_with_type) 3499 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 3500 << (int)Record->isUnion(); 3501 else { 3502 Diag((*Mem)->getLocation(), DK) 3503 << (int)Record->isUnion(); 3504 Invalid = true; 3505 } 3506 } 3507 } 3508 } 3509 3510 if (!Record->isUnion() && !Owner->isRecord()) { 3511 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 3512 << (int)getLangOpts().CPlusPlus; 3513 Invalid = true; 3514 } 3515 3516 // Mock up a declarator. 3517 Declarator Dc(DS, Declarator::MemberContext); 3518 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 3519 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 3520 3521 // Create a declaration for this anonymous struct/union. 3522 NamedDecl *Anon = 0; 3523 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 3524 Anon = FieldDecl::Create(Context, OwningClass, 3525 DS.getLocStart(), 3526 Record->getLocation(), 3527 /*IdentifierInfo=*/0, 3528 Context.getTypeDeclType(Record), 3529 TInfo, 3530 /*BitWidth=*/0, /*Mutable=*/false, 3531 /*InitStyle=*/ICIS_NoInit); 3532 Anon->setAccess(AS); 3533 if (getLangOpts().CPlusPlus) 3534 FieldCollector->Add(cast<FieldDecl>(Anon)); 3535 } else { 3536 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 3537 assert(SCSpec != DeclSpec::SCS_typedef && 3538 "Parser allowed 'typedef' as storage class VarDecl."); 3539 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3540 if (SCSpec == DeclSpec::SCS_mutable) { 3541 // mutable can only appear on non-static class members, so it's always 3542 // an error here 3543 Diag(Record->getLocation(), diag::err_mutable_nonmember); 3544 Invalid = true; 3545 SC = SC_None; 3546 } 3547 SCSpec = DS.getStorageClassSpecAsWritten(); 3548 VarDecl::StorageClass SCAsWritten 3549 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3550 3551 Anon = VarDecl::Create(Context, Owner, 3552 DS.getLocStart(), 3553 Record->getLocation(), /*IdentifierInfo=*/0, 3554 Context.getTypeDeclType(Record), 3555 TInfo, SC, SCAsWritten); 3556 3557 // Default-initialize the implicit variable. This initialization will be 3558 // trivial in almost all cases, except if a union member has an in-class 3559 // initializer: 3560 // union { int n = 0; }; 3561 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 3562 } 3563 Anon->setImplicit(); 3564 3565 // Add the anonymous struct/union object to the current 3566 // context. We'll be referencing this object when we refer to one of 3567 // its members. 3568 Owner->addDecl(Anon); 3569 3570 // Inject the members of the anonymous struct/union into the owning 3571 // context and into the identifier resolver chain for name lookup 3572 // purposes. 3573 SmallVector<NamedDecl*, 2> Chain; 3574 Chain.push_back(Anon); 3575 3576 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 3577 Chain, false)) 3578 Invalid = true; 3579 3580 // Mark this as an anonymous struct/union type. Note that we do not 3581 // do this until after we have already checked and injected the 3582 // members of this anonymous struct/union type, because otherwise 3583 // the members could be injected twice: once by DeclContext when it 3584 // builds its lookup table, and once by 3585 // InjectAnonymousStructOrUnionMembers. 3586 Record->setAnonymousStructOrUnion(true); 3587 3588 if (Invalid) 3589 Anon->setInvalidDecl(); 3590 3591 return Anon; 3592 } 3593 3594 /// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 3595 /// Microsoft C anonymous structure. 3596 /// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 3597 /// Example: 3598 /// 3599 /// struct A { int a; }; 3600 /// struct B { struct A; int b; }; 3601 /// 3602 /// void foo() { 3603 /// B var; 3604 /// var.a = 3; 3605 /// } 3606 /// 3607 Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 3608 RecordDecl *Record) { 3609 3610 // If there is no Record, get the record via the typedef. 3611 if (!Record) 3612 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 3613 3614 // Mock up a declarator. 3615 Declarator Dc(DS, Declarator::TypeNameContext); 3616 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 3617 assert(TInfo && "couldn't build declarator info for anonymous struct"); 3618 3619 // Create a declaration for this anonymous struct. 3620 NamedDecl* Anon = FieldDecl::Create(Context, 3621 cast<RecordDecl>(CurContext), 3622 DS.getLocStart(), 3623 DS.getLocStart(), 3624 /*IdentifierInfo=*/0, 3625 Context.getTypeDeclType(Record), 3626 TInfo, 3627 /*BitWidth=*/0, /*Mutable=*/false, 3628 /*InitStyle=*/ICIS_NoInit); 3629 Anon->setImplicit(); 3630 3631 // Add the anonymous struct object to the current context. 3632 CurContext->addDecl(Anon); 3633 3634 // Inject the members of the anonymous struct into the current 3635 // context and into the identifier resolver chain for name lookup 3636 // purposes. 3637 SmallVector<NamedDecl*, 2> Chain; 3638 Chain.push_back(Anon); 3639 3640 RecordDecl *RecordDef = Record->getDefinition(); 3641 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 3642 RecordDef, AS_none, 3643 Chain, true)) 3644 Anon->setInvalidDecl(); 3645 3646 return Anon; 3647 } 3648 3649 /// GetNameForDeclarator - Determine the full declaration name for the 3650 /// given Declarator. 3651 DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 3652 return GetNameFromUnqualifiedId(D.getName()); 3653 } 3654 3655 /// \brief Retrieves the declaration name from a parsed unqualified-id. 3656 DeclarationNameInfo 3657 Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 3658 DeclarationNameInfo NameInfo; 3659 NameInfo.setLoc(Name.StartLocation); 3660 3661 switch (Name.getKind()) { 3662 3663 case UnqualifiedId::IK_ImplicitSelfParam: 3664 case UnqualifiedId::IK_Identifier: 3665 NameInfo.setName(Name.Identifier); 3666 NameInfo.setLoc(Name.StartLocation); 3667 return NameInfo; 3668 3669 case UnqualifiedId::IK_OperatorFunctionId: 3670 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 3671 Name.OperatorFunctionId.Operator)); 3672 NameInfo.setLoc(Name.StartLocation); 3673 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 3674 = Name.OperatorFunctionId.SymbolLocations[0]; 3675 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 3676 = Name.EndLocation.getRawEncoding(); 3677 return NameInfo; 3678 3679 case UnqualifiedId::IK_LiteralOperatorId: 3680 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 3681 Name.Identifier)); 3682 NameInfo.setLoc(Name.StartLocation); 3683 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3684 return NameInfo; 3685 3686 case UnqualifiedId::IK_ConversionFunctionId: { 3687 TypeSourceInfo *TInfo; 3688 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3689 if (Ty.isNull()) 3690 return DeclarationNameInfo(); 3691 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3692 Context.getCanonicalType(Ty))); 3693 NameInfo.setLoc(Name.StartLocation); 3694 NameInfo.setNamedTypeInfo(TInfo); 3695 return NameInfo; 3696 } 3697 3698 case UnqualifiedId::IK_ConstructorName: { 3699 TypeSourceInfo *TInfo; 3700 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3701 if (Ty.isNull()) 3702 return DeclarationNameInfo(); 3703 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3704 Context.getCanonicalType(Ty))); 3705 NameInfo.setLoc(Name.StartLocation); 3706 NameInfo.setNamedTypeInfo(TInfo); 3707 return NameInfo; 3708 } 3709 3710 case UnqualifiedId::IK_ConstructorTemplateId: { 3711 // In well-formed code, we can only have a constructor 3712 // template-id that refers to the current context, so go there 3713 // to find the actual type being constructed. 3714 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3715 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3716 return DeclarationNameInfo(); 3717 3718 // Determine the type of the class being constructed. 3719 QualType CurClassType = Context.getTypeDeclType(CurClass); 3720 3721 // FIXME: Check two things: that the template-id names the same type as 3722 // CurClassType, and that the template-id does not occur when the name 3723 // was qualified. 3724 3725 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3726 Context.getCanonicalType(CurClassType))); 3727 NameInfo.setLoc(Name.StartLocation); 3728 // FIXME: should we retrieve TypeSourceInfo? 3729 NameInfo.setNamedTypeInfo(0); 3730 return NameInfo; 3731 } 3732 3733 case UnqualifiedId::IK_DestructorName: { 3734 TypeSourceInfo *TInfo; 3735 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3736 if (Ty.isNull()) 3737 return DeclarationNameInfo(); 3738 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3739 Context.getCanonicalType(Ty))); 3740 NameInfo.setLoc(Name.StartLocation); 3741 NameInfo.setNamedTypeInfo(TInfo); 3742 return NameInfo; 3743 } 3744 3745 case UnqualifiedId::IK_TemplateId: { 3746 TemplateName TName = Name.TemplateId->Template.get(); 3747 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3748 return Context.getNameForTemplate(TName, TNameLoc); 3749 } 3750 3751 } // switch (Name.getKind()) 3752 3753 llvm_unreachable("Unknown name kind"); 3754 } 3755 3756 static QualType getCoreType(QualType Ty) { 3757 do { 3758 if (Ty->isPointerType() || Ty->isReferenceType()) 3759 Ty = Ty->getPointeeType(); 3760 else if (Ty->isArrayType()) 3761 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3762 else 3763 return Ty.withoutLocalFastQualifiers(); 3764 } while (true); 3765 } 3766 3767 /// hasSimilarParameters - Determine whether the C++ functions Declaration 3768 /// and Definition have "nearly" matching parameters. This heuristic is 3769 /// used to improve diagnostics in the case where an out-of-line function 3770 /// definition doesn't match any declaration within the class or namespace. 3771 /// Also sets Params to the list of indices to the parameters that differ 3772 /// between the declaration and the definition. If hasSimilarParameters 3773 /// returns true and Params is empty, then all of the parameters match. 3774 static bool hasSimilarParameters(ASTContext &Context, 3775 FunctionDecl *Declaration, 3776 FunctionDecl *Definition, 3777 SmallVectorImpl<unsigned> &Params) { 3778 Params.clear(); 3779 if (Declaration->param_size() != Definition->param_size()) 3780 return false; 3781 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3782 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3783 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3784 3785 // The parameter types are identical 3786 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3787 continue; 3788 3789 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3790 QualType DefParamBaseTy = getCoreType(DefParamTy); 3791 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3792 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3793 3794 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3795 (DeclTyName && DeclTyName == DefTyName)) 3796 Params.push_back(Idx); 3797 else // The two parameters aren't even close 3798 return false; 3799 } 3800 3801 return true; 3802 } 3803 3804 /// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3805 /// declarator needs to be rebuilt in the current instantiation. 3806 /// Any bits of declarator which appear before the name are valid for 3807 /// consideration here. That's specifically the type in the decl spec 3808 /// and the base type in any member-pointer chunks. 3809 static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3810 DeclarationName Name) { 3811 // The types we specifically need to rebuild are: 3812 // - typenames, typeofs, and decltypes 3813 // - types which will become injected class names 3814 // Of course, we also need to rebuild any type referencing such a 3815 // type. It's safest to just say "dependent", but we call out a 3816 // few cases here. 3817 3818 DeclSpec &DS = D.getMutableDeclSpec(); 3819 switch (DS.getTypeSpecType()) { 3820 case DeclSpec::TST_typename: 3821 case DeclSpec::TST_typeofType: 3822 case DeclSpec::TST_underlyingType: 3823 case DeclSpec::TST_atomic: { 3824 // Grab the type from the parser. 3825 TypeSourceInfo *TSI = 0; 3826 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3827 if (T.isNull() || !T->isDependentType()) break; 3828 3829 // Make sure there's a type source info. This isn't really much 3830 // of a waste; most dependent types should have type source info 3831 // attached already. 3832 if (!TSI) 3833 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3834 3835 // Rebuild the type in the current instantiation. 3836 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3837 if (!TSI) return true; 3838 3839 // Store the new type back in the decl spec. 3840 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3841 DS.UpdateTypeRep(LocType); 3842 break; 3843 } 3844 3845 case DeclSpec::TST_decltype: 3846 case DeclSpec::TST_typeofExpr: { 3847 Expr *E = DS.getRepAsExpr(); 3848 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3849 if (Result.isInvalid()) return true; 3850 DS.UpdateExprRep(Result.get()); 3851 break; 3852 } 3853 3854 default: 3855 // Nothing to do for these decl specs. 3856 break; 3857 } 3858 3859 // It doesn't matter what order we do this in. 3860 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3861 DeclaratorChunk &Chunk = D.getTypeObject(I); 3862 3863 // The only type information in the declarator which can come 3864 // before the declaration name is the base type of a member 3865 // pointer. 3866 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3867 continue; 3868 3869 // Rebuild the scope specifier in-place. 3870 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3871 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3872 return true; 3873 } 3874 3875 return false; 3876 } 3877 3878 Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3879 D.setFunctionDefinitionKind(FDK_Declaration); 3880 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg()); 3881 3882 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3883 Dcl && Dcl->getDeclContext()->isFileContext()) 3884 Dcl->setTopLevelDeclInObjCContainer(); 3885 3886 return Dcl; 3887 } 3888 3889 /// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3890 /// If T is the name of a class, then each of the following shall have a 3891 /// name different from T: 3892 /// - every static data member of class T; 3893 /// - every member function of class T 3894 /// - every member of class T that is itself a type; 3895 /// \returns true if the declaration name violates these rules. 3896 bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3897 DeclarationNameInfo NameInfo) { 3898 DeclarationName Name = NameInfo.getName(); 3899 3900 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3901 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3902 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3903 return true; 3904 } 3905 3906 return false; 3907 } 3908 3909 /// \brief Diagnose a declaration whose declarator-id has the given 3910 /// nested-name-specifier. 3911 /// 3912 /// \param SS The nested-name-specifier of the declarator-id. 3913 /// 3914 /// \param DC The declaration context to which the nested-name-specifier 3915 /// resolves. 3916 /// 3917 /// \param Name The name of the entity being declared. 3918 /// 3919 /// \param Loc The location of the name of the entity being declared. 3920 /// 3921 /// \returns true if we cannot safely recover from this error, false otherwise. 3922 bool Sema::diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC, 3923 DeclarationName Name, 3924 SourceLocation Loc) { 3925 DeclContext *Cur = CurContext; 3926 while (isa<LinkageSpecDecl>(Cur)) 3927 Cur = Cur->getParent(); 3928 3929 // C++ [dcl.meaning]p1: 3930 // A declarator-id shall not be qualified except for the definition 3931 // of a member function (9.3) or static data member (9.4) outside of 3932 // its class, the definition or explicit instantiation of a function 3933 // or variable member of a namespace outside of its namespace, or the 3934 // definition of an explicit specialization outside of its namespace, 3935 // or the declaration of a friend function that is a member of 3936 // another class or namespace (11.3). [...] 3937 3938 // The user provided a superfluous scope specifier that refers back to the 3939 // class or namespaces in which the entity is already declared. 3940 // 3941 // class X { 3942 // void X::f(); 3943 // }; 3944 if (Cur->Equals(DC)) { 3945 Diag(Loc, LangOpts.MicrosoftExt? diag::warn_member_extra_qualification 3946 : diag::err_member_extra_qualification) 3947 << Name << FixItHint::CreateRemoval(SS.getRange()); 3948 SS.clear(); 3949 return false; 3950 } 3951 3952 // Check whether the qualifying scope encloses the scope of the original 3953 // declaration. 3954 if (!Cur->Encloses(DC)) { 3955 if (Cur->isRecord()) 3956 Diag(Loc, diag::err_member_qualification) 3957 << Name << SS.getRange(); 3958 else if (isa<TranslationUnitDecl>(DC)) 3959 Diag(Loc, diag::err_invalid_declarator_global_scope) 3960 << Name << SS.getRange(); 3961 else if (isa<FunctionDecl>(Cur)) 3962 Diag(Loc, diag::err_invalid_declarator_in_function) 3963 << Name << SS.getRange(); 3964 else 3965 Diag(Loc, diag::err_invalid_declarator_scope) 3966 << Name << cast<NamedDecl>(Cur) << cast<NamedDecl>(DC) << SS.getRange(); 3967 3968 return true; 3969 } 3970 3971 if (Cur->isRecord()) { 3972 // Cannot qualify members within a class. 3973 Diag(Loc, diag::err_member_qualification) 3974 << Name << SS.getRange(); 3975 SS.clear(); 3976 3977 // C++ constructors and destructors with incorrect scopes can break 3978 // our AST invariants by having the wrong underlying types. If 3979 // that's the case, then drop this declaration entirely. 3980 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3981 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3982 !Context.hasSameType(Name.getCXXNameType(), 3983 Context.getTypeDeclType(cast<CXXRecordDecl>(Cur)))) 3984 return true; 3985 3986 return false; 3987 } 3988 3989 // C++11 [dcl.meaning]p1: 3990 // [...] "The nested-name-specifier of the qualified declarator-id shall 3991 // not begin with a decltype-specifer" 3992 NestedNameSpecifierLoc SpecLoc(SS.getScopeRep(), SS.location_data()); 3993 while (SpecLoc.getPrefix()) 3994 SpecLoc = SpecLoc.getPrefix(); 3995 if (dyn_cast_or_null<DecltypeType>( 3996 SpecLoc.getNestedNameSpecifier()->getAsType())) 3997 Diag(Loc, diag::err_decltype_in_declarator) 3998 << SpecLoc.getTypeLoc().getSourceRange(); 3999 4000 return false; 4001 } 4002 4003 NamedDecl *Sema::HandleDeclarator(Scope *S, Declarator &D, 4004 MultiTemplateParamsArg TemplateParamLists) { 4005 // TODO: consider using NameInfo for diagnostic. 4006 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4007 DeclarationName Name = NameInfo.getName(); 4008 4009 // All of these full declarators require an identifier. If it doesn't have 4010 // one, the ParsedFreeStandingDeclSpec action should be used. 4011 if (!Name) { 4012 if (!D.isInvalidType()) // Reject this if we think it is valid. 4013 Diag(D.getDeclSpec().getLocStart(), 4014 diag::err_declarator_need_ident) 4015 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 4016 return 0; 4017 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 4018 return 0; 4019 4020 // The scope passed in may not be a decl scope. Zip up the scope tree until 4021 // we find one that is. 4022 while ((S->getFlags() & Scope::DeclScope) == 0 || 4023 (S->getFlags() & Scope::TemplateParamScope) != 0) 4024 S = S->getParent(); 4025 4026 DeclContext *DC = CurContext; 4027 if (D.getCXXScopeSpec().isInvalid()) 4028 D.setInvalidType(); 4029 else if (D.getCXXScopeSpec().isSet()) { 4030 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 4031 UPPC_DeclarationQualifier)) 4032 return 0; 4033 4034 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 4035 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 4036 if (!DC) { 4037 // If we could not compute the declaration context, it's because the 4038 // declaration context is dependent but does not refer to a class, 4039 // class template, or class template partial specialization. Complain 4040 // and return early, to avoid the coming semantic disaster. 4041 Diag(D.getIdentifierLoc(), 4042 diag::err_template_qualified_declarator_no_match) 4043 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 4044 << D.getCXXScopeSpec().getRange(); 4045 return 0; 4046 } 4047 bool IsDependentContext = DC->isDependentContext(); 4048 4049 if (!IsDependentContext && 4050 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 4051 return 0; 4052 4053 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 4054 Diag(D.getIdentifierLoc(), 4055 diag::err_member_def_undefined_record) 4056 << Name << DC << D.getCXXScopeSpec().getRange(); 4057 D.setInvalidType(); 4058 } else if (!D.getDeclSpec().isFriendSpecified()) { 4059 if (diagnoseQualifiedDeclaration(D.getCXXScopeSpec(), DC, 4060 Name, D.getIdentifierLoc())) { 4061 if (DC->isRecord()) 4062 return 0; 4063 4064 D.setInvalidType(); 4065 } 4066 } 4067 4068 // Check whether we need to rebuild the type of the given 4069 // declaration in the current instantiation. 4070 if (EnteringContext && IsDependentContext && 4071 TemplateParamLists.size() != 0) { 4072 ContextRAII SavedContext(*this, DC); 4073 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 4074 D.setInvalidType(); 4075 } 4076 } 4077 4078 if (DiagnoseClassNameShadow(DC, NameInfo)) 4079 // If this is a typedef, we'll end up spewing multiple diagnostics. 4080 // Just return early; it's safer. 4081 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 4082 return 0; 4083 4084 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 4085 QualType R = TInfo->getType(); 4086 4087 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 4088 UPPC_DeclarationType)) 4089 D.setInvalidType(); 4090 4091 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 4092 ForRedeclaration); 4093 4094 // See if this is a redefinition of a variable in the same scope. 4095 if (!D.getCXXScopeSpec().isSet()) { 4096 bool IsLinkageLookup = false; 4097 4098 // If the declaration we're planning to build will be a function 4099 // or object with linkage, then look for another declaration with 4100 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 4101 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 4102 /* Do nothing*/; 4103 else if (R->isFunctionType()) { 4104 if (CurContext->isFunctionOrMethod() || 4105 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 4106 IsLinkageLookup = true; 4107 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 4108 IsLinkageLookup = true; 4109 else if (CurContext->getRedeclContext()->isTranslationUnit() && 4110 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 4111 IsLinkageLookup = true; 4112 4113 if (IsLinkageLookup) 4114 Previous.clear(LookupRedeclarationWithLinkage); 4115 4116 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 4117 } else { // Something like "int foo::x;" 4118 LookupQualifiedName(Previous, DC); 4119 4120 // C++ [dcl.meaning]p1: 4121 // When the declarator-id is qualified, the declaration shall refer to a 4122 // previously declared member of the class or namespace to which the 4123 // qualifier refers (or, in the case of a namespace, of an element of the 4124 // inline namespace set of that namespace (7.3.1)) or to a specialization 4125 // thereof; [...] 4126 // 4127 // Note that we already checked the context above, and that we do not have 4128 // enough information to make sure that Previous contains the declaration 4129 // we want to match. For example, given: 4130 // 4131 // class X { 4132 // void f(); 4133 // void f(float); 4134 // }; 4135 // 4136 // void X::f(int) { } // ill-formed 4137 // 4138 // In this case, Previous will point to the overload set 4139 // containing the two f's declared in X, but neither of them 4140 // matches. 4141 4142 // C++ [dcl.meaning]p1: 4143 // [...] the member shall not merely have been introduced by a 4144 // using-declaration in the scope of the class or namespace nominated by 4145 // the nested-name-specifier of the declarator-id. 4146 RemoveUsingDecls(Previous); 4147 } 4148 4149 if (Previous.isSingleResult() && 4150 Previous.getFoundDecl()->isTemplateParameter()) { 4151 // Maybe we will complain about the shadowed template parameter. 4152 if (!D.isInvalidType()) 4153 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 4154 Previous.getFoundDecl()); 4155 4156 // Just pretend that we didn't see the previous declaration. 4157 Previous.clear(); 4158 } 4159 4160 // In C++, the previous declaration we find might be a tag type 4161 // (class or enum). In this case, the new declaration will hide the 4162 // tag type. Note that this does does not apply if we're declaring a 4163 // typedef (C++ [dcl.typedef]p4). 4164 if (Previous.isSingleTagDecl() && 4165 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 4166 Previous.clear(); 4167 4168 // Check that there are no default arguments other than in the parameters 4169 // of a function declaration (C++ only). 4170 if (getLangOpts().CPlusPlus) 4171 CheckExtraCXXDefaultArguments(D); 4172 4173 NamedDecl *New; 4174 4175 bool AddToScope = true; 4176 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 4177 if (TemplateParamLists.size()) { 4178 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 4179 return 0; 4180 } 4181 4182 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 4183 } else if (R->isFunctionType()) { 4184 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 4185 TemplateParamLists, 4186 AddToScope); 4187 } else { 4188 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 4189 TemplateParamLists); 4190 } 4191 4192 if (New == 0) 4193 return 0; 4194 4195 // If this has an identifier and is not an invalid redeclaration or 4196 // function template specialization, add it to the scope stack. 4197 if (New->getDeclName() && AddToScope && 4198 !(D.isRedeclaration() && New->isInvalidDecl())) 4199 PushOnScopeChains(New, S); 4200 4201 return New; 4202 } 4203 4204 /// Helper method to turn variable array types into constant array 4205 /// types in certain situations which would otherwise be errors (for 4206 /// GCC compatibility). 4207 static QualType TryToFixInvalidVariablyModifiedType(QualType T, 4208 ASTContext &Context, 4209 bool &SizeIsNegative, 4210 llvm::APSInt &Oversized) { 4211 // This method tries to turn a variable array into a constant 4212 // array even when the size isn't an ICE. This is necessary 4213 // for compatibility with code that depends on gcc's buggy 4214 // constant expression folding, like struct {char x[(int)(char*)2];} 4215 SizeIsNegative = false; 4216 Oversized = 0; 4217 4218 if (T->isDependentType()) 4219 return QualType(); 4220 4221 QualifierCollector Qs; 4222 const Type *Ty = Qs.strip(T); 4223 4224 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 4225 QualType Pointee = PTy->getPointeeType(); 4226 QualType FixedType = 4227 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 4228 Oversized); 4229 if (FixedType.isNull()) return FixedType; 4230 FixedType = Context.getPointerType(FixedType); 4231 return Qs.apply(Context, FixedType); 4232 } 4233 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 4234 QualType Inner = PTy->getInnerType(); 4235 QualType FixedType = 4236 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 4237 Oversized); 4238 if (FixedType.isNull()) return FixedType; 4239 FixedType = Context.getParenType(FixedType); 4240 return Qs.apply(Context, FixedType); 4241 } 4242 4243 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 4244 if (!VLATy) 4245 return QualType(); 4246 // FIXME: We should probably handle this case 4247 if (VLATy->getElementType()->isVariablyModifiedType()) 4248 return QualType(); 4249 4250 llvm::APSInt Res; 4251 if (!VLATy->getSizeExpr() || 4252 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 4253 return QualType(); 4254 4255 // Check whether the array size is negative. 4256 if (Res.isSigned() && Res.isNegative()) { 4257 SizeIsNegative = true; 4258 return QualType(); 4259 } 4260 4261 // Check whether the array is too large to be addressed. 4262 unsigned ActiveSizeBits 4263 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 4264 Res); 4265 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 4266 Oversized = Res; 4267 return QualType(); 4268 } 4269 4270 return Context.getConstantArrayType(VLATy->getElementType(), 4271 Res, ArrayType::Normal, 0); 4272 } 4273 4274 static void 4275 FixInvalidVariablyModifiedTypeLoc(TypeLoc SrcTL, TypeLoc DstTL) { 4276 if (PointerTypeLoc SrcPTL = SrcTL.getAs<PointerTypeLoc>()) { 4277 PointerTypeLoc DstPTL = DstTL.castAs<PointerTypeLoc>(); 4278 FixInvalidVariablyModifiedTypeLoc(SrcPTL.getPointeeLoc(), 4279 DstPTL.getPointeeLoc()); 4280 DstPTL.setStarLoc(SrcPTL.getStarLoc()); 4281 return; 4282 } 4283 if (ParenTypeLoc SrcPTL = SrcTL.getAs<ParenTypeLoc>()) { 4284 ParenTypeLoc DstPTL = DstTL.castAs<ParenTypeLoc>(); 4285 FixInvalidVariablyModifiedTypeLoc(SrcPTL.getInnerLoc(), 4286 DstPTL.getInnerLoc()); 4287 DstPTL.setLParenLoc(SrcPTL.getLParenLoc()); 4288 DstPTL.setRParenLoc(SrcPTL.getRParenLoc()); 4289 return; 4290 } 4291 ArrayTypeLoc SrcATL = SrcTL.castAs<ArrayTypeLoc>(); 4292 ArrayTypeLoc DstATL = DstTL.castAs<ArrayTypeLoc>(); 4293 TypeLoc SrcElemTL = SrcATL.getElementLoc(); 4294 TypeLoc DstElemTL = DstATL.getElementLoc(); 4295 DstElemTL.initializeFullCopy(SrcElemTL); 4296 DstATL.setLBracketLoc(SrcATL.getLBracketLoc()); 4297 DstATL.setSizeExpr(SrcATL.getSizeExpr()); 4298 DstATL.setRBracketLoc(SrcATL.getRBracketLoc()); 4299 } 4300 4301 /// Helper method to turn variable array types into constant array 4302 /// types in certain situations which would otherwise be errors (for 4303 /// GCC compatibility). 4304 static TypeSourceInfo* 4305 TryToFixInvalidVariablyModifiedTypeSourceInfo(TypeSourceInfo *TInfo, 4306 ASTContext &Context, 4307 bool &SizeIsNegative, 4308 llvm::APSInt &Oversized) { 4309 QualType FixedTy 4310 = TryToFixInvalidVariablyModifiedType(TInfo->getType(), Context, 4311 SizeIsNegative, Oversized); 4312 if (FixedTy.isNull()) 4313 return 0; 4314 TypeSourceInfo *FixedTInfo = Context.getTrivialTypeSourceInfo(FixedTy); 4315 FixInvalidVariablyModifiedTypeLoc(TInfo->getTypeLoc(), 4316 FixedTInfo->getTypeLoc()); 4317 return FixedTInfo; 4318 } 4319 4320 /// \brief Register the given locally-scoped extern "C" declaration so 4321 /// that it can be found later for redeclarations 4322 void 4323 Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 4324 const LookupResult &Previous, 4325 Scope *S) { 4326 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 4327 "Decl is not a locally-scoped decl!"); 4328 // Note that we have a locally-scoped external with this name. 4329 LocallyScopedExternCDecls[ND->getDeclName()] = ND; 4330 4331 if (!Previous.isSingleResult()) 4332 return; 4333 4334 NamedDecl *PrevDecl = Previous.getFoundDecl(); 4335 4336 // If there was a previous declaration of this entity, it may be in 4337 // our identifier chain. Update the identifier chain with the new 4338 // declaration. 4339 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 4340 // The previous declaration was found on the identifer resolver 4341 // chain, so remove it from its scope. 4342 4343 if (S->isDeclScope(PrevDecl)) { 4344 // Special case for redeclarations in the SAME scope. 4345 // Because this declaration is going to be added to the identifier chain 4346 // later, we should temporarily take it OFF the chain. 4347 IdResolver.RemoveDecl(ND); 4348 4349 } else { 4350 // Find the scope for the original declaration. 4351 while (S && !S->isDeclScope(PrevDecl)) 4352 S = S->getParent(); 4353 } 4354 4355 if (S) 4356 S->RemoveDecl(PrevDecl); 4357 } 4358 } 4359 4360 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 4361 Sema::findLocallyScopedExternCDecl(DeclarationName Name) { 4362 if (ExternalSource) { 4363 // Load locally-scoped external decls from the external source. 4364 SmallVector<NamedDecl *, 4> Decls; 4365 ExternalSource->ReadLocallyScopedExternCDecls(Decls); 4366 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 4367 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4368 = LocallyScopedExternCDecls.find(Decls[I]->getDeclName()); 4369 if (Pos == LocallyScopedExternCDecls.end()) 4370 LocallyScopedExternCDecls[Decls[I]->getDeclName()] = Decls[I]; 4371 } 4372 } 4373 4374 return LocallyScopedExternCDecls.find(Name); 4375 } 4376 4377 /// \brief Diagnose function specifiers on a declaration of an identifier that 4378 /// does not identify a function. 4379 void Sema::DiagnoseFunctionSpecifiers(const DeclSpec &DS) { 4380 // FIXME: We should probably indicate the identifier in question to avoid 4381 // confusion for constructs like "inline int a(), b;" 4382 if (DS.isInlineSpecified()) 4383 Diag(DS.getInlineSpecLoc(), 4384 diag::err_inline_non_function); 4385 4386 if (DS.isVirtualSpecified()) 4387 Diag(DS.getVirtualSpecLoc(), 4388 diag::err_virtual_non_function); 4389 4390 if (DS.isExplicitSpecified()) 4391 Diag(DS.getExplicitSpecLoc(), 4392 diag::err_explicit_non_function); 4393 4394 if (DS.isNoreturnSpecified()) 4395 Diag(DS.getNoreturnSpecLoc(), 4396 diag::err_noreturn_non_function); 4397 } 4398 4399 NamedDecl* 4400 Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 4401 TypeSourceInfo *TInfo, LookupResult &Previous) { 4402 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 4403 if (D.getCXXScopeSpec().isSet()) { 4404 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 4405 << D.getCXXScopeSpec().getRange(); 4406 D.setInvalidType(); 4407 // Pretend we didn't see the scope specifier. 4408 DC = CurContext; 4409 Previous.clear(); 4410 } 4411 4412 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 4413 4414 if (D.getDeclSpec().isThreadSpecified()) 4415 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4416 if (D.getDeclSpec().isConstexprSpecified()) 4417 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 4418 << 1; 4419 4420 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 4421 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 4422 << D.getName().getSourceRange(); 4423 return 0; 4424 } 4425 4426 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 4427 if (!NewTD) return 0; 4428 4429 // Handle attributes prior to checking for duplicates in MergeVarDecl 4430 ProcessDeclAttributes(S, NewTD, D); 4431 4432 CheckTypedefForVariablyModifiedType(S, NewTD); 4433 4434 bool Redeclaration = D.isRedeclaration(); 4435 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 4436 D.setRedeclaration(Redeclaration); 4437 return ND; 4438 } 4439 4440 void 4441 Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 4442 // C99 6.7.7p2: If a typedef name specifies a variably modified type 4443 // then it shall have block scope. 4444 // Note that variably modified types must be fixed before merging the decl so 4445 // that redeclarations will match. 4446 TypeSourceInfo *TInfo = NewTD->getTypeSourceInfo(); 4447 QualType T = TInfo->getType(); 4448 if (T->isVariablyModifiedType()) { 4449 getCurFunction()->setHasBranchProtectedScope(); 4450 4451 if (S->getFnParent() == 0) { 4452 bool SizeIsNegative; 4453 llvm::APSInt Oversized; 4454 TypeSourceInfo *FixedTInfo = 4455 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context, 4456 SizeIsNegative, 4457 Oversized); 4458 if (FixedTInfo) { 4459 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 4460 NewTD->setTypeSourceInfo(FixedTInfo); 4461 } else { 4462 if (SizeIsNegative) 4463 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 4464 else if (T->isVariableArrayType()) 4465 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 4466 else if (Oversized.getBoolValue()) 4467 Diag(NewTD->getLocation(), diag::err_array_too_large) 4468 << Oversized.toString(10); 4469 else 4470 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 4471 NewTD->setInvalidDecl(); 4472 } 4473 } 4474 } 4475 } 4476 4477 4478 /// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 4479 /// declares a typedef-name, either using the 'typedef' type specifier or via 4480 /// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 4481 NamedDecl* 4482 Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 4483 LookupResult &Previous, bool &Redeclaration) { 4484 // Merge the decl with the existing one if appropriate. If the decl is 4485 // in an outer scope, it isn't the same thing. 4486 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 4487 /*ExplicitInstantiationOrSpecialization=*/false); 4488 filterNonConflictingPreviousDecls(Context, NewTD, Previous); 4489 if (!Previous.empty()) { 4490 Redeclaration = true; 4491 MergeTypedefNameDecl(NewTD, Previous); 4492 } 4493 4494 // If this is the C FILE type, notify the AST context. 4495 if (IdentifierInfo *II = NewTD->getIdentifier()) 4496 if (!NewTD->isInvalidDecl() && 4497 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 4498 if (II->isStr("FILE")) 4499 Context.setFILEDecl(NewTD); 4500 else if (II->isStr("jmp_buf")) 4501 Context.setjmp_bufDecl(NewTD); 4502 else if (II->isStr("sigjmp_buf")) 4503 Context.setsigjmp_bufDecl(NewTD); 4504 else if (II->isStr("ucontext_t")) 4505 Context.setucontext_tDecl(NewTD); 4506 } 4507 4508 return NewTD; 4509 } 4510 4511 /// \brief Determines whether the given declaration is an out-of-scope 4512 /// previous declaration. 4513 /// 4514 /// This routine should be invoked when name lookup has found a 4515 /// previous declaration (PrevDecl) that is not in the scope where a 4516 /// new declaration by the same name is being introduced. If the new 4517 /// declaration occurs in a local scope, previous declarations with 4518 /// linkage may still be considered previous declarations (C99 4519 /// 6.2.2p4-5, C++ [basic.link]p6). 4520 /// 4521 /// \param PrevDecl the previous declaration found by name 4522 /// lookup 4523 /// 4524 /// \param DC the context in which the new declaration is being 4525 /// declared. 4526 /// 4527 /// \returns true if PrevDecl is an out-of-scope previous declaration 4528 /// for a new delcaration with the same name. 4529 static bool 4530 isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 4531 ASTContext &Context) { 4532 if (!PrevDecl) 4533 return false; 4534 4535 if (!PrevDecl->hasLinkage()) 4536 return false; 4537 4538 if (Context.getLangOpts().CPlusPlus) { 4539 // C++ [basic.link]p6: 4540 // If there is a visible declaration of an entity with linkage 4541 // having the same name and type, ignoring entities declared 4542 // outside the innermost enclosing namespace scope, the block 4543 // scope declaration declares that same entity and receives the 4544 // linkage of the previous declaration. 4545 DeclContext *OuterContext = DC->getRedeclContext(); 4546 if (!OuterContext->isFunctionOrMethod()) 4547 // This rule only applies to block-scope declarations. 4548 return false; 4549 4550 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 4551 if (PrevOuterContext->isRecord()) 4552 // We found a member function: ignore it. 4553 return false; 4554 4555 // Find the innermost enclosing namespace for the new and 4556 // previous declarations. 4557 OuterContext = OuterContext->getEnclosingNamespaceContext(); 4558 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 4559 4560 // The previous declaration is in a different namespace, so it 4561 // isn't the same function. 4562 if (!OuterContext->Equals(PrevOuterContext)) 4563 return false; 4564 } 4565 4566 return true; 4567 } 4568 4569 static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 4570 CXXScopeSpec &SS = D.getCXXScopeSpec(); 4571 if (!SS.isSet()) return; 4572 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 4573 } 4574 4575 bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 4576 QualType type = decl->getType(); 4577 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 4578 if (lifetime == Qualifiers::OCL_Autoreleasing) { 4579 // Various kinds of declaration aren't allowed to be __autoreleasing. 4580 unsigned kind = -1U; 4581 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 4582 if (var->hasAttr<BlocksAttr>()) 4583 kind = 0; // __block 4584 else if (!var->hasLocalStorage()) 4585 kind = 1; // global 4586 } else if (isa<ObjCIvarDecl>(decl)) { 4587 kind = 3; // ivar 4588 } else if (isa<FieldDecl>(decl)) { 4589 kind = 2; // field 4590 } 4591 4592 if (kind != -1U) { 4593 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 4594 << kind; 4595 } 4596 } else if (lifetime == Qualifiers::OCL_None) { 4597 // Try to infer lifetime. 4598 if (!type->isObjCLifetimeType()) 4599 return false; 4600 4601 lifetime = type->getObjCARCImplicitLifetime(); 4602 type = Context.getLifetimeQualifiedType(type, lifetime); 4603 decl->setType(type); 4604 } 4605 4606 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 4607 // Thread-local variables cannot have lifetime. 4608 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 4609 var->isThreadSpecified()) { 4610 Diag(var->getLocation(), diag::err_arc_thread_ownership) 4611 << var->getType(); 4612 return true; 4613 } 4614 } 4615 4616 return false; 4617 } 4618 4619 static void checkAttributesAfterMerging(Sema &S, NamedDecl &ND) { 4620 // 'weak' only applies to declarations with external linkage. 4621 if (WeakAttr *Attr = ND.getAttr<WeakAttr>()) { 4622 if (ND.getLinkage() != ExternalLinkage) { 4623 S.Diag(Attr->getLocation(), diag::err_attribute_weak_static); 4624 ND.dropAttr<WeakAttr>(); 4625 } 4626 } 4627 if (WeakRefAttr *Attr = ND.getAttr<WeakRefAttr>()) { 4628 if (ND.hasExternalLinkage()) { 4629 S.Diag(Attr->getLocation(), diag::err_attribute_weakref_not_static); 4630 ND.dropAttr<WeakRefAttr>(); 4631 } 4632 } 4633 } 4634 4635 static bool shouldConsiderLinkage(const VarDecl *VD) { 4636 const DeclContext *DC = VD->getDeclContext()->getRedeclContext(); 4637 if (DC->isFunctionOrMethod()) 4638 return VD->hasExternalStorageAsWritten(); 4639 if (DC->isFileContext()) 4640 return true; 4641 if (DC->isRecord()) 4642 return false; 4643 llvm_unreachable("Unexpected context"); 4644 } 4645 4646 static bool shouldConsiderLinkage(const FunctionDecl *FD) { 4647 const DeclContext *DC = FD->getDeclContext()->getRedeclContext(); 4648 if (DC->isFileContext() || DC->isFunctionOrMethod()) 4649 return true; 4650 if (DC->isRecord()) 4651 return false; 4652 llvm_unreachable("Unexpected context"); 4653 } 4654 4655 NamedDecl* 4656 Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4657 TypeSourceInfo *TInfo, LookupResult &Previous, 4658 MultiTemplateParamsArg TemplateParamLists) { 4659 QualType R = TInfo->getType(); 4660 DeclarationName Name = GetNameForDeclarator(D).getName(); 4661 4662 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 4663 assert(SCSpec != DeclSpec::SCS_typedef && 4664 "Parser allowed 'typedef' as storage class VarDecl."); 4665 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 4666 4667 if (getLangOpts().OpenCL && !getOpenCLOptions().cl_khr_fp16) 4668 { 4669 // OpenCL v1.2 s6.1.1.1: reject declaring variables of the half and 4670 // half array type (unless the cl_khr_fp16 extension is enabled). 4671 if (Context.getBaseElementType(R)->isHalfType()) { 4672 Diag(D.getIdentifierLoc(), diag::err_opencl_half_declaration) << R; 4673 D.setInvalidType(); 4674 } 4675 } 4676 4677 if (SCSpec == DeclSpec::SCS_mutable) { 4678 // mutable can only appear on non-static class members, so it's always 4679 // an error here 4680 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 4681 D.setInvalidType(); 4682 SC = SC_None; 4683 } 4684 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4685 VarDecl::StorageClass SCAsWritten 4686 = StorageClassSpecToVarDeclStorageClass(SCSpec); 4687 4688 IdentifierInfo *II = Name.getAsIdentifierInfo(); 4689 if (!II) { 4690 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 4691 << Name; 4692 return 0; 4693 } 4694 4695 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 4696 4697 if (!DC->isRecord() && S->getFnParent() == 0) { 4698 // C99 6.9p2: The storage-class specifiers auto and register shall not 4699 // appear in the declaration specifiers in an external declaration. 4700 if (SC == SC_Auto || SC == SC_Register) { 4701 4702 // If this is a register variable with an asm label specified, then this 4703 // is a GNU extension. 4704 if (SC == SC_Register && D.getAsmLabel()) 4705 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 4706 else 4707 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 4708 D.setInvalidType(); 4709 } 4710 } 4711 4712 if (getLangOpts().OpenCL) { 4713 // Set up the special work-group-local storage class for variables in the 4714 // OpenCL __local address space. 4715 if (R.getAddressSpace() == LangAS::opencl_local) { 4716 SC = SC_OpenCLWorkGroupLocal; 4717 SCAsWritten = SC_OpenCLWorkGroupLocal; 4718 } 4719 4720 // OpenCL v1.2 s6.9.b p4: 4721 // The sampler type cannot be used with the __local and __global address 4722 // space qualifiers. 4723 if (R->isSamplerT() && (R.getAddressSpace() == LangAS::opencl_local || 4724 R.getAddressSpace() == LangAS::opencl_global)) { 4725 Diag(D.getIdentifierLoc(), diag::err_wrong_sampler_addressspace); 4726 } 4727 4728 // OpenCL 1.2 spec, p6.9 r: 4729 // The event type cannot be used to declare a program scope variable. 4730 // The event type cannot be used with the __local, __constant and __global 4731 // address space qualifiers. 4732 if (R->isEventT()) { 4733 if (S->getParent() == 0) { 4734 Diag(D.getLocStart(), diag::err_event_t_global_var); 4735 D.setInvalidType(); 4736 } 4737 4738 if (R.getAddressSpace()) { 4739 Diag(D.getLocStart(), diag::err_event_t_addr_space_qual); 4740 D.setInvalidType(); 4741 } 4742 } 4743 } 4744 4745 bool isExplicitSpecialization = false; 4746 VarDecl *NewVD; 4747 if (!getLangOpts().CPlusPlus) { 4748 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4749 D.getIdentifierLoc(), II, 4750 R, TInfo, SC, SCAsWritten); 4751 4752 if (D.isInvalidType()) 4753 NewVD->setInvalidDecl(); 4754 } else { 4755 if (DC->isRecord() && !CurContext->isRecord()) { 4756 // This is an out-of-line definition of a static data member. 4757 if (SC == SC_Static) { 4758 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4759 diag::err_static_out_of_line) 4760 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4761 } else if (SC == SC_None) 4762 SC = SC_Static; 4763 } 4764 if (SC == SC_Static && CurContext->isRecord()) { 4765 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 4766 if (RD->isLocalClass()) 4767 Diag(D.getIdentifierLoc(), 4768 diag::err_static_data_member_not_allowed_in_local_class) 4769 << Name << RD->getDeclName(); 4770 4771 // C++98 [class.union]p1: If a union contains a static data member, 4772 // the program is ill-formed. C++11 drops this restriction. 4773 if (RD->isUnion()) 4774 Diag(D.getIdentifierLoc(), 4775 getLangOpts().CPlusPlus11 4776 ? diag::warn_cxx98_compat_static_data_member_in_union 4777 : diag::ext_static_data_member_in_union) << Name; 4778 // We conservatively disallow static data members in anonymous structs. 4779 else if (!RD->getDeclName()) 4780 Diag(D.getIdentifierLoc(), 4781 diag::err_static_data_member_not_allowed_in_anon_struct) 4782 << Name << RD->isUnion(); 4783 } 4784 } 4785 4786 // Match up the template parameter lists with the scope specifier, then 4787 // determine whether we have a template or a template specialization. 4788 isExplicitSpecialization = false; 4789 bool Invalid = false; 4790 if (TemplateParameterList *TemplateParams 4791 = MatchTemplateParametersToScopeSpecifier( 4792 D.getDeclSpec().getLocStart(), 4793 D.getIdentifierLoc(), 4794 D.getCXXScopeSpec(), 4795 TemplateParamLists.data(), 4796 TemplateParamLists.size(), 4797 /*never a friend*/ false, 4798 isExplicitSpecialization, 4799 Invalid)) { 4800 if (TemplateParams->size() > 0) { 4801 // There is no such thing as a variable template. 4802 Diag(D.getIdentifierLoc(), diag::err_template_variable) 4803 << II 4804 << SourceRange(TemplateParams->getTemplateLoc(), 4805 TemplateParams->getRAngleLoc()); 4806 return 0; 4807 } else { 4808 // There is an extraneous 'template<>' for this variable. Complain 4809 // about it, but allow the declaration of the variable. 4810 Diag(TemplateParams->getTemplateLoc(), 4811 diag::err_template_variable_noparams) 4812 << II 4813 << SourceRange(TemplateParams->getTemplateLoc(), 4814 TemplateParams->getRAngleLoc()); 4815 } 4816 } 4817 4818 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4819 D.getIdentifierLoc(), II, 4820 R, TInfo, SC, SCAsWritten); 4821 4822 // If this decl has an auto type in need of deduction, make a note of the 4823 // Decl so we can diagnose uses of it in its own initializer. 4824 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 4825 R->getContainedAutoType()) 4826 ParsingInitForAutoVars.insert(NewVD); 4827 4828 if (D.isInvalidType() || Invalid) 4829 NewVD->setInvalidDecl(); 4830 4831 SetNestedNameSpecifier(NewVD, D); 4832 4833 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 4834 NewVD->setTemplateParameterListsInfo(Context, 4835 TemplateParamLists.size(), 4836 TemplateParamLists.data()); 4837 } 4838 4839 if (D.getDeclSpec().isConstexprSpecified()) 4840 NewVD->setConstexpr(true); 4841 } 4842 4843 // Set the lexical context. If the declarator has a C++ scope specifier, the 4844 // lexical context will be different from the semantic context. 4845 NewVD->setLexicalDeclContext(CurContext); 4846 4847 if (D.getDeclSpec().isThreadSpecified()) { 4848 if (NewVD->hasLocalStorage()) 4849 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4850 else if (!Context.getTargetInfo().isTLSSupported()) 4851 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4852 else 4853 NewVD->setThreadSpecified(true); 4854 } 4855 4856 if (D.getDeclSpec().isModulePrivateSpecified()) { 4857 if (isExplicitSpecialization) 4858 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4859 << 2 4860 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4861 else if (NewVD->hasLocalStorage()) 4862 Diag(NewVD->getLocation(), diag::err_module_private_local) 4863 << 0 << NewVD->getDeclName() 4864 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4865 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4866 else 4867 NewVD->setModulePrivate(); 4868 } 4869 4870 // Handle attributes prior to checking for duplicates in MergeVarDecl 4871 ProcessDeclAttributes(S, NewVD, D); 4872 4873 if (NewVD->hasAttrs()) 4874 CheckAlignasUnderalignment(NewVD); 4875 4876 if (getLangOpts().CUDA) { 4877 // CUDA B.2.5: "__shared__ and __constant__ variables have implied static 4878 // storage [duration]." 4879 if (SC == SC_None && S->getFnParent() != 0 && 4880 (NewVD->hasAttr<CUDASharedAttr>() || 4881 NewVD->hasAttr<CUDAConstantAttr>())) { 4882 NewVD->setStorageClass(SC_Static); 4883 NewVD->setStorageClassAsWritten(SC_Static); 4884 } 4885 } 4886 4887 // In auto-retain/release, infer strong retension for variables of 4888 // retainable type. 4889 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4890 NewVD->setInvalidDecl(); 4891 4892 // Handle GNU asm-label extension (encoded as an attribute). 4893 if (Expr *E = (Expr*)D.getAsmLabel()) { 4894 // The parser guarantees this is a string. 4895 StringLiteral *SE = cast<StringLiteral>(E); 4896 StringRef Label = SE->getString(); 4897 if (S->getFnParent() != 0) { 4898 switch (SC) { 4899 case SC_None: 4900 case SC_Auto: 4901 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4902 break; 4903 case SC_Register: 4904 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4905 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4906 break; 4907 case SC_Static: 4908 case SC_Extern: 4909 case SC_PrivateExtern: 4910 case SC_OpenCLWorkGroupLocal: 4911 break; 4912 } 4913 } 4914 4915 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4916 Context, Label)); 4917 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 4918 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 4919 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier()); 4920 if (I != ExtnameUndeclaredIdentifiers.end()) { 4921 NewVD->addAttr(I->second); 4922 ExtnameUndeclaredIdentifiers.erase(I); 4923 } 4924 } 4925 4926 // Diagnose shadowed variables before filtering for scope. 4927 if (!D.getCXXScopeSpec().isSet()) 4928 CheckShadow(S, NewVD, Previous); 4929 4930 // Don't consider existing declarations that are in a different 4931 // scope and are out-of-semantic-context declarations (if the new 4932 // declaration has linkage). 4933 FilterLookupForScope(Previous, DC, S, shouldConsiderLinkage(NewVD), 4934 isExplicitSpecialization); 4935 4936 if (!getLangOpts().CPlusPlus) { 4937 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4938 } else { 4939 // Merge the decl with the existing one if appropriate. 4940 if (!Previous.empty()) { 4941 if (Previous.isSingleResult() && 4942 isa<FieldDecl>(Previous.getFoundDecl()) && 4943 D.getCXXScopeSpec().isSet()) { 4944 // The user tried to define a non-static data member 4945 // out-of-line (C++ [dcl.meaning]p1). 4946 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4947 << D.getCXXScopeSpec().getRange(); 4948 Previous.clear(); 4949 NewVD->setInvalidDecl(); 4950 } 4951 } else if (D.getCXXScopeSpec().isSet()) { 4952 // No previous declaration in the qualifying scope. 4953 Diag(D.getIdentifierLoc(), diag::err_no_member) 4954 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4955 << D.getCXXScopeSpec().getRange(); 4956 NewVD->setInvalidDecl(); 4957 } 4958 4959 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4960 4961 // This is an explicit specialization of a static data member. Check it. 4962 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4963 CheckMemberSpecialization(NewVD, Previous)) 4964 NewVD->setInvalidDecl(); 4965 } 4966 4967 ProcessPragmaWeak(S, NewVD); 4968 checkAttributesAfterMerging(*this, *NewVD); 4969 4970 // If this is a locally-scoped extern C variable, update the map of 4971 // such variables. 4972 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4973 !NewVD->isInvalidDecl()) 4974 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4975 4976 return NewVD; 4977 } 4978 4979 /// \brief Diagnose variable or built-in function shadowing. Implements 4980 /// -Wshadow. 4981 /// 4982 /// This method is called whenever a VarDecl is added to a "useful" 4983 /// scope. 4984 /// 4985 /// \param S the scope in which the shadowing name is being declared 4986 /// \param R the lookup of the name 4987 /// 4988 void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4989 // Return if warning is ignored. 4990 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4991 DiagnosticsEngine::Ignored) 4992 return; 4993 4994 // Don't diagnose declarations at file scope. 4995 if (D->hasGlobalStorage()) 4996 return; 4997 4998 DeclContext *NewDC = D->getDeclContext(); 4999 5000 // Only diagnose if we're shadowing an unambiguous field or variable. 5001 if (R.getResultKind() != LookupResult::Found) 5002 return; 5003 5004 NamedDecl* ShadowedDecl = R.getFoundDecl(); 5005 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 5006 return; 5007 5008 // Fields are not shadowed by variables in C++ static methods. 5009 if (isa<FieldDecl>(ShadowedDecl)) 5010 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 5011 if (MD->isStatic()) 5012 return; 5013 5014 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 5015 if (shadowedVar->isExternC()) { 5016 // For shadowing external vars, make sure that we point to the global 5017 // declaration, not a locally scoped extern declaration. 5018 for (VarDecl::redecl_iterator 5019 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 5020 I != E; ++I) 5021 if (I->isFileVarDecl()) { 5022 ShadowedDecl = *I; 5023 break; 5024 } 5025 } 5026 5027 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 5028 5029 // Only warn about certain kinds of shadowing for class members. 5030 if (NewDC && NewDC->isRecord()) { 5031 // In particular, don't warn about shadowing non-class members. 5032 if (!OldDC->isRecord()) 5033 return; 5034 5035 // TODO: should we warn about static data members shadowing 5036 // static data members from base classes? 5037 5038 // TODO: don't diagnose for inaccessible shadowed members. 5039 // This is hard to do perfectly because we might friend the 5040 // shadowing context, but that's just a false negative. 5041 } 5042 5043 // Determine what kind of declaration we're shadowing. 5044 unsigned Kind; 5045 if (isa<RecordDecl>(OldDC)) { 5046 if (isa<FieldDecl>(ShadowedDecl)) 5047 Kind = 3; // field 5048 else 5049 Kind = 2; // static data member 5050 } else if (OldDC->isFileContext()) 5051 Kind = 1; // global 5052 else 5053 Kind = 0; // local 5054 5055 DeclarationName Name = R.getLookupName(); 5056 5057 // Emit warning and note. 5058 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 5059 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 5060 } 5061 5062 /// \brief Check -Wshadow without the advantage of a previous lookup. 5063 void Sema::CheckShadow(Scope *S, VarDecl *D) { 5064 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 5065 DiagnosticsEngine::Ignored) 5066 return; 5067 5068 LookupResult R(*this, D->getDeclName(), D->getLocation(), 5069 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 5070 LookupName(R, S); 5071 CheckShadow(S, D, R); 5072 } 5073 5074 template<typename T> 5075 static bool mayConflictWithNonVisibleExternC(const T *ND) { 5076 const DeclContext *DC = ND->getDeclContext(); 5077 if (DC->getRedeclContext()->isTranslationUnit()) 5078 return true; 5079 5080 // We know that is the first decl we see, other than function local 5081 // extern C ones. If this is C++ and the decl is not in a extern C context 5082 // it cannot have C language linkage. Avoid calling isExternC in that case. 5083 // We need to this because of code like 5084 // 5085 // namespace { struct bar {}; } 5086 // auto foo = bar(); 5087 // 5088 // This code runs before the init of foo is set, and therefore before 5089 // the type of foo is known. Not knowing the type we cannot know its linkage 5090 // unless it is in an extern C block. 5091 if (!DC->isExternCContext()) { 5092 const ASTContext &Context = ND->getASTContext(); 5093 if (Context.getLangOpts().CPlusPlus) 5094 return false; 5095 } 5096 5097 return ND->isExternC(); 5098 } 5099 5100 /// \brief Perform semantic checking on a newly-created variable 5101 /// declaration. 5102 /// 5103 /// This routine performs all of the type-checking required for a 5104 /// variable declaration once it has been built. It is used both to 5105 /// check variables after they have been parsed and their declarators 5106 /// have been translated into a declaration, and to check variables 5107 /// that have been instantiated from a template. 5108 /// 5109 /// Sets NewVD->isInvalidDecl() if an error was encountered. 5110 /// 5111 /// Returns true if the variable declaration is a redeclaration. 5112 bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 5113 LookupResult &Previous) { 5114 // If the decl is already known invalid, don't check it. 5115 if (NewVD->isInvalidDecl()) 5116 return false; 5117 5118 TypeSourceInfo *TInfo = NewVD->getTypeSourceInfo(); 5119 QualType T = TInfo->getType(); 5120 5121 if (T->isObjCObjectType()) { 5122 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 5123 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 5124 T = Context.getObjCObjectPointerType(T); 5125 NewVD->setType(T); 5126 } 5127 5128 // Emit an error if an address space was applied to decl with local storage. 5129 // This includes arrays of objects with address space qualifiers, but not 5130 // automatic variables that point to other address spaces. 5131 // ISO/IEC TR 18037 S5.1.2 5132 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 5133 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 5134 NewVD->setInvalidDecl(); 5135 return false; 5136 } 5137 5138 // OpenCL v1.2 s6.8 -- The static qualifier is valid only in program 5139 // scope. 5140 if ((getLangOpts().OpenCLVersion >= 120) 5141 && NewVD->isStaticLocal()) { 5142 Diag(NewVD->getLocation(), diag::err_static_function_scope); 5143 NewVD->setInvalidDecl(); 5144 return false; 5145 } 5146 5147 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 5148 && !NewVD->hasAttr<BlocksAttr>()) { 5149 if (getLangOpts().getGC() != LangOptions::NonGC) 5150 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 5151 else { 5152 assert(!getLangOpts().ObjCAutoRefCount); 5153 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 5154 } 5155 } 5156 5157 bool isVM = T->isVariablyModifiedType(); 5158 if (isVM || NewVD->hasAttr<CleanupAttr>() || 5159 NewVD->hasAttr<BlocksAttr>()) 5160 getCurFunction()->setHasBranchProtectedScope(); 5161 5162 if ((isVM && NewVD->hasLinkage()) || 5163 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 5164 bool SizeIsNegative; 5165 llvm::APSInt Oversized; 5166 TypeSourceInfo *FixedTInfo = 5167 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context, 5168 SizeIsNegative, Oversized); 5169 if (FixedTInfo == 0 && T->isVariableArrayType()) { 5170 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 5171 // FIXME: This won't give the correct result for 5172 // int a[10][n]; 5173 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 5174 5175 if (NewVD->isFileVarDecl()) 5176 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 5177 << SizeRange; 5178 else if (NewVD->getStorageClass() == SC_Static) 5179 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 5180 << SizeRange; 5181 else 5182 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 5183 << SizeRange; 5184 NewVD->setInvalidDecl(); 5185 return false; 5186 } 5187 5188 if (FixedTInfo == 0) { 5189 if (NewVD->isFileVarDecl()) 5190 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 5191 else 5192 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 5193 NewVD->setInvalidDecl(); 5194 return false; 5195 } 5196 5197 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 5198 NewVD->setType(FixedTInfo->getType()); 5199 NewVD->setTypeSourceInfo(FixedTInfo); 5200 } 5201 5202 if (Previous.empty() && mayConflictWithNonVisibleExternC(NewVD)) { 5203 // Since we did not find anything by this name, look for a non-visible 5204 // extern "C" declaration with the same name. 5205 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5206 = findLocallyScopedExternCDecl(NewVD->getDeclName()); 5207 if (Pos != LocallyScopedExternCDecls.end()) 5208 Previous.addDecl(Pos->second); 5209 } 5210 5211 // Filter out any non-conflicting previous declarations. 5212 filterNonConflictingPreviousDecls(Context, NewVD, Previous); 5213 5214 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 5215 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 5216 << T; 5217 NewVD->setInvalidDecl(); 5218 return false; 5219 } 5220 5221 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 5222 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 5223 NewVD->setInvalidDecl(); 5224 return false; 5225 } 5226 5227 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 5228 Diag(NewVD->getLocation(), diag::err_block_on_vm); 5229 NewVD->setInvalidDecl(); 5230 return false; 5231 } 5232 5233 if (NewVD->isConstexpr() && !T->isDependentType() && 5234 RequireLiteralType(NewVD->getLocation(), T, 5235 diag::err_constexpr_var_non_literal)) { 5236 NewVD->setInvalidDecl(); 5237 return false; 5238 } 5239 5240 if (!Previous.empty()) { 5241 MergeVarDecl(NewVD, Previous); 5242 return true; 5243 } 5244 return false; 5245 } 5246 5247 /// \brief Data used with FindOverriddenMethod 5248 struct FindOverriddenMethodData { 5249 Sema *S; 5250 CXXMethodDecl *Method; 5251 }; 5252 5253 /// \brief Member lookup function that determines whether a given C++ 5254 /// method overrides a method in a base class, to be used with 5255 /// CXXRecordDecl::lookupInBases(). 5256 static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 5257 CXXBasePath &Path, 5258 void *UserData) { 5259 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5260 5261 FindOverriddenMethodData *Data 5262 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 5263 5264 DeclarationName Name = Data->Method->getDeclName(); 5265 5266 // FIXME: Do we care about other names here too? 5267 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 5268 // We really want to find the base class destructor here. 5269 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 5270 CanQualType CT = Data->S->Context.getCanonicalType(T); 5271 5272 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 5273 } 5274 5275 for (Path.Decls = BaseRecord->lookup(Name); 5276 !Path.Decls.empty(); 5277 Path.Decls = Path.Decls.slice(1)) { 5278 NamedDecl *D = Path.Decls.front(); 5279 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5280 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 5281 return true; 5282 } 5283 } 5284 5285 return false; 5286 } 5287 5288 namespace { 5289 enum OverrideErrorKind { OEK_All, OEK_NonDeleted, OEK_Deleted }; 5290 } 5291 /// \brief Report an error regarding overriding, along with any relevant 5292 /// overriden methods. 5293 /// 5294 /// \param DiagID the primary error to report. 5295 /// \param MD the overriding method. 5296 /// \param OEK which overrides to include as notes. 5297 static void ReportOverrides(Sema& S, unsigned DiagID, const CXXMethodDecl *MD, 5298 OverrideErrorKind OEK = OEK_All) { 5299 S.Diag(MD->getLocation(), DiagID) << MD->getDeclName(); 5300 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5301 E = MD->end_overridden_methods(); 5302 I != E; ++I) { 5303 // This check (& the OEK parameter) could be replaced by a predicate, but 5304 // without lambdas that would be overkill. This is still nicer than writing 5305 // out the diag loop 3 times. 5306 if ((OEK == OEK_All) || 5307 (OEK == OEK_NonDeleted && !(*I)->isDeleted()) || 5308 (OEK == OEK_Deleted && (*I)->isDeleted())) 5309 S.Diag((*I)->getLocation(), diag::note_overridden_virtual_function); 5310 } 5311 } 5312 5313 /// AddOverriddenMethods - See if a method overrides any in the base classes, 5314 /// and if so, check that it's a valid override and remember it. 5315 bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5316 // Look for virtual methods in base classes that this method might override. 5317 CXXBasePaths Paths; 5318 FindOverriddenMethodData Data; 5319 Data.Method = MD; 5320 Data.S = this; 5321 bool hasDeletedOverridenMethods = false; 5322 bool hasNonDeletedOverridenMethods = false; 5323 bool AddedAny = false; 5324 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 5325 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 5326 E = Paths.found_decls_end(); I != E; ++I) { 5327 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 5328 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 5329 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 5330 !CheckOverridingFunctionAttributes(MD, OldMD) && 5331 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 5332 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 5333 hasDeletedOverridenMethods |= OldMD->isDeleted(); 5334 hasNonDeletedOverridenMethods |= !OldMD->isDeleted(); 5335 AddedAny = true; 5336 } 5337 } 5338 } 5339 } 5340 5341 if (hasDeletedOverridenMethods && !MD->isDeleted()) { 5342 ReportOverrides(*this, diag::err_non_deleted_override, MD, OEK_Deleted); 5343 } 5344 if (hasNonDeletedOverridenMethods && MD->isDeleted()) { 5345 ReportOverrides(*this, diag::err_deleted_override, MD, OEK_NonDeleted); 5346 } 5347 5348 return AddedAny; 5349 } 5350 5351 namespace { 5352 // Struct for holding all of the extra arguments needed by 5353 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 5354 struct ActOnFDArgs { 5355 Scope *S; 5356 Declarator &D; 5357 MultiTemplateParamsArg TemplateParamLists; 5358 bool AddToScope; 5359 }; 5360 } 5361 5362 namespace { 5363 5364 // Callback to only accept typo corrections that have a non-zero edit distance. 5365 // Also only accept corrections that have the same parent decl. 5366 class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 5367 public: 5368 DifferentNameValidatorCCC(ASTContext &Context, FunctionDecl *TypoFD, 5369 CXXRecordDecl *Parent) 5370 : Context(Context), OriginalFD(TypoFD), 5371 ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {} 5372 5373 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5374 if (candidate.getEditDistance() == 0) 5375 return false; 5376 5377 SmallVector<unsigned, 1> MismatchedParams; 5378 for (TypoCorrection::const_decl_iterator CDecl = candidate.begin(), 5379 CDeclEnd = candidate.end(); 5380 CDecl != CDeclEnd; ++CDecl) { 5381 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 5382 5383 if (FD && !FD->hasBody() && 5384 hasSimilarParameters(Context, FD, OriginalFD, MismatchedParams)) { 5385 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 5386 CXXRecordDecl *Parent = MD->getParent(); 5387 if (Parent && Parent->getCanonicalDecl() == ExpectedParent) 5388 return true; 5389 } else if (!ExpectedParent) { 5390 return true; 5391 } 5392 } 5393 } 5394 5395 return false; 5396 } 5397 5398 private: 5399 ASTContext &Context; 5400 FunctionDecl *OriginalFD; 5401 CXXRecordDecl *ExpectedParent; 5402 }; 5403 5404 } 5405 5406 /// \brief Generate diagnostics for an invalid function redeclaration. 5407 /// 5408 /// This routine handles generating the diagnostic messages for an invalid 5409 /// function redeclaration, including finding possible similar declarations 5410 /// or performing typo correction if there are no previous declarations with 5411 /// the same name. 5412 /// 5413 /// Returns a NamedDecl iff typo correction was performed and substituting in 5414 /// the new declaration name does not cause new errors. 5415 static NamedDecl* DiagnoseInvalidRedeclaration( 5416 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 5417 ActOnFDArgs &ExtraArgs) { 5418 NamedDecl *Result = NULL; 5419 DeclarationName Name = NewFD->getDeclName(); 5420 DeclContext *NewDC = NewFD->getDeclContext(); 5421 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 5422 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 5423 SmallVector<unsigned, 1> MismatchedParams; 5424 SmallVector<std::pair<FunctionDecl *, unsigned>, 1> NearMatches; 5425 TypoCorrection Correction; 5426 bool isFriendDecl = (SemaRef.getLangOpts().CPlusPlus && 5427 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 5428 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 5429 : diag::err_member_def_does_not_match; 5430 5431 NewFD->setInvalidDecl(); 5432 SemaRef.LookupQualifiedName(Prev, NewDC); 5433 assert(!Prev.isAmbiguous() && 5434 "Cannot have an ambiguity in previous-declaration lookup"); 5435 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 5436 DifferentNameValidatorCCC Validator(SemaRef.Context, NewFD, 5437 MD ? MD->getParent() : 0); 5438 if (!Prev.empty()) { 5439 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 5440 Func != FuncEnd; ++Func) { 5441 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 5442 if (FD && 5443 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 5444 // Add 1 to the index so that 0 can mean the mismatch didn't 5445 // involve a parameter 5446 unsigned ParamNum = 5447 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 5448 NearMatches.push_back(std::make_pair(FD, ParamNum)); 5449 } 5450 } 5451 // If the qualified name lookup yielded nothing, try typo correction 5452 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 5453 Prev.getLookupKind(), 0, 0, 5454 Validator, NewDC))) { 5455 // Trap errors. 5456 Sema::SFINAETrap Trap(SemaRef); 5457 5458 // Set up everything for the call to ActOnFunctionDeclarator 5459 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 5460 ExtraArgs.D.getIdentifierLoc()); 5461 Previous.clear(); 5462 Previous.setLookupName(Correction.getCorrection()); 5463 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 5464 CDeclEnd = Correction.end(); 5465 CDecl != CDeclEnd; ++CDecl) { 5466 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 5467 if (FD && !FD->hasBody() && 5468 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 5469 Previous.addDecl(FD); 5470 } 5471 } 5472 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 5473 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 5474 // pieces need to verify the typo-corrected C++ declaraction and hopefully 5475 // eliminate the need for the parameter pack ExtraArgs. 5476 Result = SemaRef.ActOnFunctionDeclarator( 5477 ExtraArgs.S, ExtraArgs.D, 5478 Correction.getCorrectionDecl()->getDeclContext(), 5479 NewFD->getTypeSourceInfo(), Previous, ExtraArgs.TemplateParamLists, 5480 ExtraArgs.AddToScope); 5481 if (Trap.hasErrorOccurred()) { 5482 // Pretend the typo correction never occurred 5483 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 5484 ExtraArgs.D.getIdentifierLoc()); 5485 ExtraArgs.D.setRedeclaration(wasRedeclaration); 5486 Previous.clear(); 5487 Previous.setLookupName(Name); 5488 Result = NULL; 5489 } else { 5490 for (LookupResult::iterator Func = Previous.begin(), 5491 FuncEnd = Previous.end(); 5492 Func != FuncEnd; ++Func) { 5493 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 5494 NearMatches.push_back(std::make_pair(FD, 0)); 5495 } 5496 } 5497 if (NearMatches.empty()) { 5498 // Ignore the correction if it didn't yield any close FunctionDecl matches 5499 Correction = TypoCorrection(); 5500 } else { 5501 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 5502 : diag::err_member_def_does_not_match_suggest; 5503 } 5504 } 5505 5506 if (Correction) { 5507 // FIXME: use Correction.getCorrectionRange() instead of computing the range 5508 // here. This requires passing in the CXXScopeSpec to CorrectTypo which in 5509 // turn causes the correction to fully qualify the name. If we fix 5510 // CorrectTypo to minimally qualify then this change should be good. 5511 SourceRange FixItLoc(NewFD->getLocation()); 5512 CXXScopeSpec &SS = ExtraArgs.D.getCXXScopeSpec(); 5513 if (Correction.getCorrectionSpecifier() && SS.isValid()) 5514 FixItLoc.setBegin(SS.getBeginLoc()); 5515 SemaRef.Diag(NewFD->getLocStart(), DiagMsg) 5516 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOpts()) 5517 << FixItHint::CreateReplacement( 5518 FixItLoc, Correction.getAsString(SemaRef.getLangOpts())); 5519 } else { 5520 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 5521 << Name << NewDC << NewFD->getLocation(); 5522 } 5523 5524 bool NewFDisConst = false; 5525 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 5526 NewFDisConst = NewMD->isConst(); 5527 5528 for (SmallVector<std::pair<FunctionDecl *, unsigned>, 1>::iterator 5529 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 5530 NearMatch != NearMatchEnd; ++NearMatch) { 5531 FunctionDecl *FD = NearMatch->first; 5532 bool FDisConst = false; 5533 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 5534 FDisConst = MD->isConst(); 5535 5536 if (unsigned Idx = NearMatch->second) { 5537 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 5538 SourceLocation Loc = FDParam->getTypeSpecStartLoc(); 5539 if (Loc.isInvalid()) Loc = FD->getLocation(); 5540 SemaRef.Diag(Loc, diag::note_member_def_close_param_match) 5541 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 5542 } else if (Correction) { 5543 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 5544 << Correction.getQuoted(SemaRef.getLangOpts()); 5545 } else if (FDisConst != NewFDisConst) { 5546 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 5547 << NewFDisConst << FD->getSourceRange().getEnd(); 5548 } else 5549 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 5550 } 5551 return Result; 5552 } 5553 5554 static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 5555 Declarator &D) { 5556 switch (D.getDeclSpec().getStorageClassSpec()) { 5557 default: llvm_unreachable("Unknown storage class!"); 5558 case DeclSpec::SCS_auto: 5559 case DeclSpec::SCS_register: 5560 case DeclSpec::SCS_mutable: 5561 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5562 diag::err_typecheck_sclass_func); 5563 D.setInvalidType(); 5564 break; 5565 case DeclSpec::SCS_unspecified: break; 5566 case DeclSpec::SCS_extern: return SC_Extern; 5567 case DeclSpec::SCS_static: { 5568 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 5569 // C99 6.7.1p5: 5570 // The declaration of an identifier for a function that has 5571 // block scope shall have no explicit storage-class specifier 5572 // other than extern 5573 // See also (C++ [dcl.stc]p4). 5574 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5575 diag::err_static_block_func); 5576 break; 5577 } else 5578 return SC_Static; 5579 } 5580 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 5581 } 5582 5583 // No explicit storage class has already been returned 5584 return SC_None; 5585 } 5586 5587 static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 5588 DeclContext *DC, QualType &R, 5589 TypeSourceInfo *TInfo, 5590 FunctionDecl::StorageClass SC, 5591 bool &IsVirtualOkay) { 5592 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 5593 DeclarationName Name = NameInfo.getName(); 5594 5595 FunctionDecl *NewFD = 0; 5596 bool isInline = D.getDeclSpec().isInlineSpecified(); 5597 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 5598 FunctionDecl::StorageClass SCAsWritten 5599 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 5600 5601 if (!SemaRef.getLangOpts().CPlusPlus) { 5602 // Determine whether the function was written with a 5603 // prototype. This true when: 5604 // - there is a prototype in the declarator, or 5605 // - the type R of the function is some kind of typedef or other reference 5606 // to a type name (which eventually refers to a function type). 5607 bool HasPrototype = 5608 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 5609 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 5610 5611 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 5612 D.getLocStart(), NameInfo, R, 5613 TInfo, SC, SCAsWritten, isInline, 5614 HasPrototype); 5615 if (D.isInvalidType()) 5616 NewFD->setInvalidDecl(); 5617 5618 // Set the lexical context. 5619 NewFD->setLexicalDeclContext(SemaRef.CurContext); 5620 5621 return NewFD; 5622 } 5623 5624 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 5625 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 5626 5627 // Check that the return type is not an abstract class type. 5628 // For record types, this is done by the AbstractClassUsageDiagnoser once 5629 // the class has been completely parsed. 5630 if (!DC->isRecord() && 5631 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 5632 R->getAs<FunctionType>()->getResultType(), 5633 diag::err_abstract_type_in_decl, 5634 SemaRef.AbstractReturnType)) 5635 D.setInvalidType(); 5636 5637 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 5638 // This is a C++ constructor declaration. 5639 assert(DC->isRecord() && 5640 "Constructors can only be declared in a member context"); 5641 5642 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 5643 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 5644 D.getLocStart(), NameInfo, 5645 R, TInfo, isExplicit, isInline, 5646 /*isImplicitlyDeclared=*/false, 5647 isConstexpr); 5648 5649 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 5650 // This is a C++ destructor declaration. 5651 if (DC->isRecord()) { 5652 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 5653 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 5654 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 5655 SemaRef.Context, Record, 5656 D.getLocStart(), 5657 NameInfo, R, TInfo, isInline, 5658 /*isImplicitlyDeclared=*/false); 5659 5660 // If the class is complete, then we now create the implicit exception 5661 // specification. If the class is incomplete or dependent, we can't do 5662 // it yet. 5663 if (SemaRef.getLangOpts().CPlusPlus11 && !Record->isDependentType() && 5664 Record->getDefinition() && !Record->isBeingDefined() && 5665 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 5666 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 5667 } 5668 5669 IsVirtualOkay = true; 5670 return NewDD; 5671 5672 } else { 5673 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 5674 D.setInvalidType(); 5675 5676 // Create a FunctionDecl to satisfy the function definition parsing 5677 // code path. 5678 return FunctionDecl::Create(SemaRef.Context, DC, 5679 D.getLocStart(), 5680 D.getIdentifierLoc(), Name, R, TInfo, 5681 SC, SCAsWritten, isInline, 5682 /*hasPrototype=*/true, isConstexpr); 5683 } 5684 5685 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 5686 if (!DC->isRecord()) { 5687 SemaRef.Diag(D.getIdentifierLoc(), 5688 diag::err_conv_function_not_member); 5689 return 0; 5690 } 5691 5692 SemaRef.CheckConversionDeclarator(D, R, SC); 5693 IsVirtualOkay = true; 5694 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 5695 D.getLocStart(), NameInfo, 5696 R, TInfo, isInline, isExplicit, 5697 isConstexpr, SourceLocation()); 5698 5699 } else if (DC->isRecord()) { 5700 // If the name of the function is the same as the name of the record, 5701 // then this must be an invalid constructor that has a return type. 5702 // (The parser checks for a return type and makes the declarator a 5703 // constructor if it has no return type). 5704 if (Name.getAsIdentifierInfo() && 5705 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 5706 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 5707 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5708 << SourceRange(D.getIdentifierLoc()); 5709 return 0; 5710 } 5711 5712 bool isStatic = SC == SC_Static; 5713 5714 // [class.free]p1: 5715 // Any allocation function for a class T is a static member 5716 // (even if not explicitly declared static). 5717 if (Name.getCXXOverloadedOperator() == OO_New || 5718 Name.getCXXOverloadedOperator() == OO_Array_New) 5719 isStatic = true; 5720 5721 // [class.free]p6 Any deallocation function for a class X is a static member 5722 // (even if not explicitly declared static). 5723 if (Name.getCXXOverloadedOperator() == OO_Delete || 5724 Name.getCXXOverloadedOperator() == OO_Array_Delete) 5725 isStatic = true; 5726 5727 IsVirtualOkay = !isStatic; 5728 5729 // This is a C++ method declaration. 5730 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 5731 D.getLocStart(), NameInfo, R, 5732 TInfo, isStatic, SCAsWritten, isInline, 5733 isConstexpr, SourceLocation()); 5734 5735 } else { 5736 // Determine whether the function was written with a 5737 // prototype. This true when: 5738 // - we're in C++ (where every function has a prototype), 5739 return FunctionDecl::Create(SemaRef.Context, DC, 5740 D.getLocStart(), 5741 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 5742 true/*HasPrototype*/, isConstexpr); 5743 } 5744 } 5745 5746 void Sema::checkVoidParamDecl(ParmVarDecl *Param) { 5747 // In C++, the empty parameter-type-list must be spelled "void"; a 5748 // typedef of void is not permitted. 5749 if (getLangOpts().CPlusPlus && 5750 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5751 bool IsTypeAlias = false; 5752 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5753 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5754 else if (const TemplateSpecializationType *TST = 5755 Param->getType()->getAs<TemplateSpecializationType>()) 5756 IsTypeAlias = TST->isTypeAlias(); 5757 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5758 << IsTypeAlias; 5759 } 5760 } 5761 5762 NamedDecl* 5763 Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 5764 TypeSourceInfo *TInfo, LookupResult &Previous, 5765 MultiTemplateParamsArg TemplateParamLists, 5766 bool &AddToScope) { 5767 QualType R = TInfo->getType(); 5768 5769 assert(R.getTypePtr()->isFunctionType()); 5770 5771 // TODO: consider using NameInfo for diagnostic. 5772 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 5773 DeclarationName Name = NameInfo.getName(); 5774 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 5775 5776 if (D.getDeclSpec().isThreadSpecified()) 5777 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5778 5779 // Do not allow returning a objc interface by-value. 5780 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 5781 Diag(D.getIdentifierLoc(), 5782 diag::err_object_cannot_be_passed_returned_by_value) << 0 5783 << R->getAs<FunctionType>()->getResultType() 5784 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 5785 5786 QualType T = R->getAs<FunctionType>()->getResultType(); 5787 T = Context.getObjCObjectPointerType(T); 5788 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 5789 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 5790 R = Context.getFunctionType(T, 5791 ArrayRef<QualType>(FPT->arg_type_begin(), 5792 FPT->getNumArgs()), 5793 EPI); 5794 } 5795 else if (isa<FunctionNoProtoType>(R)) 5796 R = Context.getFunctionNoProtoType(T); 5797 } 5798 5799 bool isFriend = false; 5800 FunctionTemplateDecl *FunctionTemplate = 0; 5801 bool isExplicitSpecialization = false; 5802 bool isFunctionTemplateSpecialization = false; 5803 5804 bool isDependentClassScopeExplicitSpecialization = false; 5805 bool HasExplicitTemplateArgs = false; 5806 TemplateArgumentListInfo TemplateArgs; 5807 5808 bool isVirtualOkay = false; 5809 5810 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 5811 isVirtualOkay); 5812 if (!NewFD) return 0; 5813 5814 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 5815 NewFD->setTopLevelDeclInObjCContainer(); 5816 5817 if (getLangOpts().CPlusPlus) { 5818 bool isInline = D.getDeclSpec().isInlineSpecified(); 5819 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5820 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 5821 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 5822 isFriend = D.getDeclSpec().isFriendSpecified(); 5823 if (isFriend && !isInline && D.isFunctionDefinition()) { 5824 // C++ [class.friend]p5 5825 // A function can be defined in a friend declaration of a 5826 // class . . . . Such a function is implicitly inline. 5827 NewFD->setImplicitlyInline(); 5828 } 5829 5830 // If this is a method defined in an __interface, and is not a constructor 5831 // or an overloaded operator, then set the pure flag (isVirtual will already 5832 // return true). 5833 if (const CXXRecordDecl *Parent = 5834 dyn_cast<CXXRecordDecl>(NewFD->getDeclContext())) { 5835 if (Parent->isInterface() && cast<CXXMethodDecl>(NewFD)->isUserProvided()) 5836 NewFD->setPure(true); 5837 } 5838 5839 SetNestedNameSpecifier(NewFD, D); 5840 isExplicitSpecialization = false; 5841 isFunctionTemplateSpecialization = false; 5842 if (D.isInvalidType()) 5843 NewFD->setInvalidDecl(); 5844 5845 // Set the lexical context. If the declarator has a C++ 5846 // scope specifier, or is the object of a friend declaration, the 5847 // lexical context will be different from the semantic context. 5848 NewFD->setLexicalDeclContext(CurContext); 5849 5850 // Match up the template parameter lists with the scope specifier, then 5851 // determine whether we have a template or a template specialization. 5852 bool Invalid = false; 5853 if (TemplateParameterList *TemplateParams 5854 = MatchTemplateParametersToScopeSpecifier( 5855 D.getDeclSpec().getLocStart(), 5856 D.getIdentifierLoc(), 5857 D.getCXXScopeSpec(), 5858 TemplateParamLists.data(), 5859 TemplateParamLists.size(), 5860 isFriend, 5861 isExplicitSpecialization, 5862 Invalid)) { 5863 if (TemplateParams->size() > 0) { 5864 // This is a function template 5865 5866 // Check that we can declare a template here. 5867 if (CheckTemplateDeclScope(S, TemplateParams)) 5868 return 0; 5869 5870 // A destructor cannot be a template. 5871 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 5872 Diag(NewFD->getLocation(), diag::err_destructor_template); 5873 return 0; 5874 } 5875 5876 // If we're adding a template to a dependent context, we may need to 5877 // rebuilding some of the types used within the template parameter list, 5878 // now that we know what the current instantiation is. 5879 if (DC->isDependentContext()) { 5880 ContextRAII SavedContext(*this, DC); 5881 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 5882 Invalid = true; 5883 } 5884 5885 5886 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 5887 NewFD->getLocation(), 5888 Name, TemplateParams, 5889 NewFD); 5890 FunctionTemplate->setLexicalDeclContext(CurContext); 5891 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 5892 5893 // For source fidelity, store the other template param lists. 5894 if (TemplateParamLists.size() > 1) { 5895 NewFD->setTemplateParameterListsInfo(Context, 5896 TemplateParamLists.size() - 1, 5897 TemplateParamLists.data()); 5898 } 5899 } else { 5900 // This is a function template specialization. 5901 isFunctionTemplateSpecialization = true; 5902 // For source fidelity, store all the template param lists. 5903 NewFD->setTemplateParameterListsInfo(Context, 5904 TemplateParamLists.size(), 5905 TemplateParamLists.data()); 5906 5907 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 5908 if (isFriend) { 5909 // We want to remove the "template<>", found here. 5910 SourceRange RemoveRange = TemplateParams->getSourceRange(); 5911 5912 // If we remove the template<> and the name is not a 5913 // template-id, we're actually silently creating a problem: 5914 // the friend declaration will refer to an untemplated decl, 5915 // and clearly the user wants a template specialization. So 5916 // we need to insert '<>' after the name. 5917 SourceLocation InsertLoc; 5918 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 5919 InsertLoc = D.getName().getSourceRange().getEnd(); 5920 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 5921 } 5922 5923 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 5924 << Name << RemoveRange 5925 << FixItHint::CreateRemoval(RemoveRange) 5926 << FixItHint::CreateInsertion(InsertLoc, "<>"); 5927 } 5928 } 5929 } 5930 else { 5931 // All template param lists were matched against the scope specifier: 5932 // this is NOT (an explicit specialization of) a template. 5933 if (TemplateParamLists.size() > 0) 5934 // For source fidelity, store all the template param lists. 5935 NewFD->setTemplateParameterListsInfo(Context, 5936 TemplateParamLists.size(), 5937 TemplateParamLists.data()); 5938 } 5939 5940 if (Invalid) { 5941 NewFD->setInvalidDecl(); 5942 if (FunctionTemplate) 5943 FunctionTemplate->setInvalidDecl(); 5944 } 5945 5946 // C++ [dcl.fct.spec]p5: 5947 // The virtual specifier shall only be used in declarations of 5948 // nonstatic class member functions that appear within a 5949 // member-specification of a class declaration; see 10.3. 5950 // 5951 if (isVirtual && !NewFD->isInvalidDecl()) { 5952 if (!isVirtualOkay) { 5953 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5954 diag::err_virtual_non_function); 5955 } else if (!CurContext->isRecord()) { 5956 // 'virtual' was specified outside of the class. 5957 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5958 diag::err_virtual_out_of_class) 5959 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5960 } else if (NewFD->getDescribedFunctionTemplate()) { 5961 // C++ [temp.mem]p3: 5962 // A member function template shall not be virtual. 5963 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5964 diag::err_virtual_member_function_template) 5965 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5966 } else { 5967 // Okay: Add virtual to the method. 5968 NewFD->setVirtualAsWritten(true); 5969 } 5970 } 5971 5972 // C++ [dcl.fct.spec]p3: 5973 // The inline specifier shall not appear on a block scope function 5974 // declaration. 5975 if (isInline && !NewFD->isInvalidDecl()) { 5976 if (CurContext->isFunctionOrMethod()) { 5977 // 'inline' is not allowed on block scope function declaration. 5978 Diag(D.getDeclSpec().getInlineSpecLoc(), 5979 diag::err_inline_declaration_block_scope) << Name 5980 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5981 } 5982 } 5983 5984 // C++ [dcl.fct.spec]p6: 5985 // The explicit specifier shall be used only in the declaration of a 5986 // constructor or conversion function within its class definition; 5987 // see 12.3.1 and 12.3.2. 5988 if (isExplicit && !NewFD->isInvalidDecl()) { 5989 if (!CurContext->isRecord()) { 5990 // 'explicit' was specified outside of the class. 5991 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5992 diag::err_explicit_out_of_class) 5993 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5994 } else if (!isa<CXXConstructorDecl>(NewFD) && 5995 !isa<CXXConversionDecl>(NewFD)) { 5996 // 'explicit' was specified on a function that wasn't a constructor 5997 // or conversion function. 5998 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5999 diag::err_explicit_non_ctor_or_conv_function) 6000 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 6001 } 6002 } 6003 6004 if (isConstexpr) { 6005 // C++11 [dcl.constexpr]p2: constexpr functions and constexpr constructors 6006 // are implicitly inline. 6007 NewFD->setImplicitlyInline(); 6008 6009 // C++11 [dcl.constexpr]p3: functions declared constexpr are required to 6010 // be either constructors or to return a literal type. Therefore, 6011 // destructors cannot be declared constexpr. 6012 if (isa<CXXDestructorDecl>(NewFD)) 6013 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 6014 } 6015 6016 // If __module_private__ was specified, mark the function accordingly. 6017 if (D.getDeclSpec().isModulePrivateSpecified()) { 6018 if (isFunctionTemplateSpecialization) { 6019 SourceLocation ModulePrivateLoc 6020 = D.getDeclSpec().getModulePrivateSpecLoc(); 6021 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 6022 << 0 6023 << FixItHint::CreateRemoval(ModulePrivateLoc); 6024 } else { 6025 NewFD->setModulePrivate(); 6026 if (FunctionTemplate) 6027 FunctionTemplate->setModulePrivate(); 6028 } 6029 } 6030 6031 if (isFriend) { 6032 // For now, claim that the objects have no previous declaration. 6033 if (FunctionTemplate) { 6034 FunctionTemplate->setObjectOfFriendDecl(false); 6035 FunctionTemplate->setAccess(AS_public); 6036 } 6037 NewFD->setObjectOfFriendDecl(false); 6038 NewFD->setAccess(AS_public); 6039 } 6040 6041 // If a function is defined as defaulted or deleted, mark it as such now. 6042 switch (D.getFunctionDefinitionKind()) { 6043 case FDK_Declaration: 6044 case FDK_Definition: 6045 break; 6046 6047 case FDK_Defaulted: 6048 NewFD->setDefaulted(); 6049 break; 6050 6051 case FDK_Deleted: 6052 NewFD->setDeletedAsWritten(); 6053 break; 6054 } 6055 6056 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 6057 D.isFunctionDefinition()) { 6058 // C++ [class.mfct]p2: 6059 // A member function may be defined (8.4) in its class definition, in 6060 // which case it is an inline member function (7.1.2) 6061 NewFD->setImplicitlyInline(); 6062 } 6063 6064 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 6065 !CurContext->isRecord()) { 6066 // C++ [class.static]p1: 6067 // A data or function member of a class may be declared static 6068 // in a class definition, in which case it is a static member of 6069 // the class. 6070 6071 // Complain about the 'static' specifier if it's on an out-of-line 6072 // member function definition. 6073 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 6074 diag::err_static_out_of_line) 6075 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 6076 } 6077 6078 // C++11 [except.spec]p15: 6079 // A deallocation function with no exception-specification is treated 6080 // as if it were specified with noexcept(true). 6081 const FunctionProtoType *FPT = R->getAs<FunctionProtoType>(); 6082 if ((Name.getCXXOverloadedOperator() == OO_Delete || 6083 Name.getCXXOverloadedOperator() == OO_Array_Delete) && 6084 getLangOpts().CPlusPlus11 && FPT && !FPT->hasExceptionSpec()) { 6085 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 6086 EPI.ExceptionSpecType = EST_BasicNoexcept; 6087 NewFD->setType(Context.getFunctionType(FPT->getResultType(), 6088 ArrayRef<QualType>(FPT->arg_type_begin(), 6089 FPT->getNumArgs()), 6090 EPI)); 6091 } 6092 } 6093 6094 // Filter out previous declarations that don't match the scope. 6095 FilterLookupForScope(Previous, DC, S, shouldConsiderLinkage(NewFD), 6096 isExplicitSpecialization || 6097 isFunctionTemplateSpecialization); 6098 6099 // Handle GNU asm-label extension (encoded as an attribute). 6100 if (Expr *E = (Expr*) D.getAsmLabel()) { 6101 // The parser guarantees this is a string. 6102 StringLiteral *SE = cast<StringLiteral>(E); 6103 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 6104 SE->getString())); 6105 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 6106 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 6107 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); 6108 if (I != ExtnameUndeclaredIdentifiers.end()) { 6109 NewFD->addAttr(I->second); 6110 ExtnameUndeclaredIdentifiers.erase(I); 6111 } 6112 } 6113 6114 // Copy the parameter declarations from the declarator D to the function 6115 // declaration NewFD, if they are available. First scavenge them into Params. 6116 SmallVector<ParmVarDecl*, 16> Params; 6117 if (D.isFunctionDeclarator()) { 6118 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6119 6120 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 6121 // function that takes no arguments, not a function that takes a 6122 // single void argument. 6123 // We let through "const void" here because Sema::GetTypeForDeclarator 6124 // already checks for that case. 6125 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 6126 FTI.ArgInfo[0].Param && 6127 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 6128 // Empty arg list, don't push any params. 6129 checkVoidParamDecl(cast<ParmVarDecl>(FTI.ArgInfo[0].Param)); 6130 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 6131 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 6132 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 6133 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 6134 Param->setDeclContext(NewFD); 6135 Params.push_back(Param); 6136 6137 if (Param->isInvalidDecl()) 6138 NewFD->setInvalidDecl(); 6139 } 6140 } 6141 6142 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 6143 // When we're declaring a function with a typedef, typeof, etc as in the 6144 // following example, we'll need to synthesize (unnamed) 6145 // parameters for use in the declaration. 6146 // 6147 // @code 6148 // typedef void fn(int); 6149 // fn f; 6150 // @endcode 6151 6152 // Synthesize a parameter for each argument type. 6153 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 6154 AE = FT->arg_type_end(); AI != AE; ++AI) { 6155 ParmVarDecl *Param = 6156 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 6157 Param->setScopeInfo(0, Params.size()); 6158 Params.push_back(Param); 6159 } 6160 } else { 6161 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 6162 "Should not need args for typedef of non-prototype fn"); 6163 } 6164 6165 // Finally, we know we have the right number of parameters, install them. 6166 NewFD->setParams(Params); 6167 6168 // Find all anonymous symbols defined during the declaration of this function 6169 // and add to NewFD. This lets us track decls such 'enum Y' in: 6170 // 6171 // void f(enum Y {AA} x) {} 6172 // 6173 // which would otherwise incorrectly end up in the translation unit scope. 6174 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope); 6175 DeclsInPrototypeScope.clear(); 6176 6177 if (D.getDeclSpec().isNoreturnSpecified()) 6178 NewFD->addAttr( 6179 ::new(Context) C11NoReturnAttr(D.getDeclSpec().getNoreturnSpecLoc(), 6180 Context)); 6181 6182 // Process the non-inheritable attributes on this declaration. 6183 ProcessDeclAttributes(S, NewFD, D, 6184 /*NonInheritable=*/true, /*Inheritable=*/false); 6185 6186 // Functions returning a variably modified type violate C99 6.7.5.2p2 6187 // because all functions have linkage. 6188 if (!NewFD->isInvalidDecl() && 6189 NewFD->getResultType()->isVariablyModifiedType()) { 6190 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 6191 NewFD->setInvalidDecl(); 6192 } 6193 6194 // Handle attributes. 6195 ProcessDeclAttributes(S, NewFD, D, 6196 /*NonInheritable=*/false, /*Inheritable=*/true); 6197 6198 QualType RetType = NewFD->getResultType(); 6199 const CXXRecordDecl *Ret = RetType->isRecordType() ? 6200 RetType->getAsCXXRecordDecl() : RetType->getPointeeCXXRecordDecl(); 6201 if (!NewFD->isInvalidDecl() && !NewFD->hasAttr<WarnUnusedResultAttr>() && 6202 Ret && Ret->hasAttr<WarnUnusedResultAttr>()) { 6203 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 6204 if (!(MD && MD->getCorrespondingMethodInClass(Ret, true))) { 6205 NewFD->addAttr(new (Context) WarnUnusedResultAttr(SourceRange(), 6206 Context)); 6207 } 6208 } 6209 6210 if (!getLangOpts().CPlusPlus) { 6211 // Perform semantic checking on the function declaration. 6212 bool isExplicitSpecialization=false; 6213 if (!NewFD->isInvalidDecl()) { 6214 if (NewFD->isMain()) 6215 CheckMain(NewFD, D.getDeclSpec()); 6216 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 6217 isExplicitSpecialization)); 6218 } 6219 // Make graceful recovery from an invalid redeclaration. 6220 else if (!Previous.empty()) 6221 D.setRedeclaration(true); 6222 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 6223 Previous.getResultKind() != LookupResult::FoundOverloaded) && 6224 "previous declaration set still overloaded"); 6225 } else { 6226 // If the declarator is a template-id, translate the parser's template 6227 // argument list into our AST format. 6228 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 6229 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 6230 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 6231 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 6232 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(), 6233 TemplateId->NumArgs); 6234 translateTemplateArguments(TemplateArgsPtr, 6235 TemplateArgs); 6236 6237 HasExplicitTemplateArgs = true; 6238 6239 if (NewFD->isInvalidDecl()) { 6240 HasExplicitTemplateArgs = false; 6241 } else if (FunctionTemplate) { 6242 // Function template with explicit template arguments. 6243 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 6244 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 6245 6246 HasExplicitTemplateArgs = false; 6247 } else if (!isFunctionTemplateSpecialization && 6248 !D.getDeclSpec().isFriendSpecified()) { 6249 // We have encountered something that the user meant to be a 6250 // specialization (because it has explicitly-specified template 6251 // arguments) but that was not introduced with a "template<>" (or had 6252 // too few of them). 6253 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 6254 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 6255 << FixItHint::CreateInsertion( 6256 D.getDeclSpec().getLocStart(), 6257 "template<> "); 6258 isFunctionTemplateSpecialization = true; 6259 } else { 6260 // "friend void foo<>(int);" is an implicit specialization decl. 6261 isFunctionTemplateSpecialization = true; 6262 } 6263 } else if (isFriend && isFunctionTemplateSpecialization) { 6264 // This combination is only possible in a recovery case; the user 6265 // wrote something like: 6266 // template <> friend void foo(int); 6267 // which we're recovering from as if the user had written: 6268 // friend void foo<>(int); 6269 // Go ahead and fake up a template id. 6270 HasExplicitTemplateArgs = true; 6271 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 6272 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 6273 } 6274 6275 // If it's a friend (and only if it's a friend), it's possible 6276 // that either the specialized function type or the specialized 6277 // template is dependent, and therefore matching will fail. In 6278 // this case, don't check the specialization yet. 6279 bool InstantiationDependent = false; 6280 if (isFunctionTemplateSpecialization && isFriend && 6281 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 6282 TemplateSpecializationType::anyDependentTemplateArguments( 6283 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 6284 InstantiationDependent))) { 6285 assert(HasExplicitTemplateArgs && 6286 "friend function specialization without template args"); 6287 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 6288 Previous)) 6289 NewFD->setInvalidDecl(); 6290 } else if (isFunctionTemplateSpecialization) { 6291 if (CurContext->isDependentContext() && CurContext->isRecord() 6292 && !isFriend) { 6293 isDependentClassScopeExplicitSpecialization = true; 6294 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ? 6295 diag::ext_function_specialization_in_class : 6296 diag::err_function_specialization_in_class) 6297 << NewFD->getDeclName(); 6298 } else if (CheckFunctionTemplateSpecialization(NewFD, 6299 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 6300 Previous)) 6301 NewFD->setInvalidDecl(); 6302 6303 // C++ [dcl.stc]p1: 6304 // A storage-class-specifier shall not be specified in an explicit 6305 // specialization (14.7.3) 6306 if (SC != SC_None) { 6307 if (SC != NewFD->getStorageClass()) 6308 Diag(NewFD->getLocation(), 6309 diag::err_explicit_specialization_inconsistent_storage_class) 6310 << SC 6311 << FixItHint::CreateRemoval( 6312 D.getDeclSpec().getStorageClassSpecLoc()); 6313 6314 else 6315 Diag(NewFD->getLocation(), 6316 diag::ext_explicit_specialization_storage_class) 6317 << FixItHint::CreateRemoval( 6318 D.getDeclSpec().getStorageClassSpecLoc()); 6319 } 6320 6321 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 6322 if (CheckMemberSpecialization(NewFD, Previous)) 6323 NewFD->setInvalidDecl(); 6324 } 6325 6326 // Perform semantic checking on the function declaration. 6327 if (!isDependentClassScopeExplicitSpecialization) { 6328 if (NewFD->isInvalidDecl()) { 6329 // If this is a class member, mark the class invalid immediately. 6330 // This avoids some consistency errors later. 6331 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 6332 methodDecl->getParent()->setInvalidDecl(); 6333 } else { 6334 if (NewFD->isMain()) 6335 CheckMain(NewFD, D.getDeclSpec()); 6336 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 6337 isExplicitSpecialization)); 6338 } 6339 } 6340 6341 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 6342 Previous.getResultKind() != LookupResult::FoundOverloaded) && 6343 "previous declaration set still overloaded"); 6344 6345 NamedDecl *PrincipalDecl = (FunctionTemplate 6346 ? cast<NamedDecl>(FunctionTemplate) 6347 : NewFD); 6348 6349 if (isFriend && D.isRedeclaration()) { 6350 AccessSpecifier Access = AS_public; 6351 if (!NewFD->isInvalidDecl()) 6352 Access = NewFD->getPreviousDecl()->getAccess(); 6353 6354 NewFD->setAccess(Access); 6355 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 6356 6357 PrincipalDecl->setObjectOfFriendDecl(true); 6358 } 6359 6360 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 6361 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 6362 PrincipalDecl->setNonMemberOperator(); 6363 6364 // If we have a function template, check the template parameter 6365 // list. This will check and merge default template arguments. 6366 if (FunctionTemplate) { 6367 FunctionTemplateDecl *PrevTemplate = 6368 FunctionTemplate->getPreviousDecl(); 6369 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 6370 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 6371 D.getDeclSpec().isFriendSpecified() 6372 ? (D.isFunctionDefinition() 6373 ? TPC_FriendFunctionTemplateDefinition 6374 : TPC_FriendFunctionTemplate) 6375 : (D.getCXXScopeSpec().isSet() && 6376 DC && DC->isRecord() && 6377 DC->isDependentContext()) 6378 ? TPC_ClassTemplateMember 6379 : TPC_FunctionTemplate); 6380 } 6381 6382 if (NewFD->isInvalidDecl()) { 6383 // Ignore all the rest of this. 6384 } else if (!D.isRedeclaration()) { 6385 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 6386 AddToScope }; 6387 // Fake up an access specifier if it's supposed to be a class member. 6388 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 6389 NewFD->setAccess(AS_public); 6390 6391 // Qualified decls generally require a previous declaration. 6392 if (D.getCXXScopeSpec().isSet()) { 6393 // ...with the major exception of templated-scope or 6394 // dependent-scope friend declarations. 6395 6396 // TODO: we currently also suppress this check in dependent 6397 // contexts because (1) the parameter depth will be off when 6398 // matching friend templates and (2) we might actually be 6399 // selecting a friend based on a dependent factor. But there 6400 // are situations where these conditions don't apply and we 6401 // can actually do this check immediately. 6402 if (isFriend && 6403 (TemplateParamLists.size() || 6404 D.getCXXScopeSpec().getScopeRep()->isDependent() || 6405 CurContext->isDependentContext())) { 6406 // ignore these 6407 } else { 6408 // The user tried to provide an out-of-line definition for a 6409 // function that is a member of a class or namespace, but there 6410 // was no such member function declared (C++ [class.mfct]p2, 6411 // C++ [namespace.memdef]p2). For example: 6412 // 6413 // class X { 6414 // void f() const; 6415 // }; 6416 // 6417 // void X::f() { } // ill-formed 6418 // 6419 // Complain about this problem, and attempt to suggest close 6420 // matches (e.g., those that differ only in cv-qualifiers and 6421 // whether the parameter types are references). 6422 6423 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 6424 NewFD, 6425 ExtraArgs)) { 6426 AddToScope = ExtraArgs.AddToScope; 6427 return Result; 6428 } 6429 } 6430 6431 // Unqualified local friend declarations are required to resolve 6432 // to something. 6433 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 6434 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 6435 NewFD, 6436 ExtraArgs)) { 6437 AddToScope = ExtraArgs.AddToScope; 6438 return Result; 6439 } 6440 } 6441 6442 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 6443 !isFriend && !isFunctionTemplateSpecialization && 6444 !isExplicitSpecialization) { 6445 // An out-of-line member function declaration must also be a 6446 // definition (C++ [dcl.meaning]p1). 6447 // Note that this is not the case for explicit specializations of 6448 // function templates or member functions of class templates, per 6449 // C++ [temp.expl.spec]p2. We also allow these declarations as an 6450 // extension for compatibility with old SWIG code which likes to 6451 // generate them. 6452 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 6453 << D.getCXXScopeSpec().getRange(); 6454 } 6455 } 6456 6457 ProcessPragmaWeak(S, NewFD); 6458 checkAttributesAfterMerging(*this, *NewFD); 6459 6460 AddKnownFunctionAttributes(NewFD); 6461 6462 if (NewFD->hasAttr<OverloadableAttr>() && 6463 !NewFD->getType()->getAs<FunctionProtoType>()) { 6464 Diag(NewFD->getLocation(), 6465 diag::err_attribute_overloadable_no_prototype) 6466 << NewFD; 6467 6468 // Turn this into a variadic function with no parameters. 6469 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 6470 FunctionProtoType::ExtProtoInfo EPI; 6471 EPI.Variadic = true; 6472 EPI.ExtInfo = FT->getExtInfo(); 6473 6474 QualType R = Context.getFunctionType(FT->getResultType(), 6475 ArrayRef<QualType>(), 6476 EPI); 6477 NewFD->setType(R); 6478 } 6479 6480 // If there's a #pragma GCC visibility in scope, and this isn't a class 6481 // member, set the visibility of this function. 6482 if (!DC->isRecord() && NewFD->hasExternalLinkage()) 6483 AddPushedVisibilityAttribute(NewFD); 6484 6485 // If there's a #pragma clang arc_cf_code_audited in scope, consider 6486 // marking the function. 6487 AddCFAuditedAttribute(NewFD); 6488 6489 // If this is a locally-scoped extern C function, update the 6490 // map of such names. 6491 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 6492 && !NewFD->isInvalidDecl()) 6493 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 6494 6495 // Set this FunctionDecl's range up to the right paren. 6496 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 6497 6498 if (getLangOpts().CPlusPlus) { 6499 if (FunctionTemplate) { 6500 if (NewFD->isInvalidDecl()) 6501 FunctionTemplate->setInvalidDecl(); 6502 return FunctionTemplate; 6503 } 6504 } 6505 6506 if (NewFD->hasAttr<OpenCLKernelAttr>()) { 6507 // OpenCL v1.2 s6.8 static is invalid for kernel functions. 6508 if ((getLangOpts().OpenCLVersion >= 120) 6509 && (SC == SC_Static)) { 6510 Diag(D.getIdentifierLoc(), diag::err_static_kernel); 6511 D.setInvalidType(); 6512 } 6513 6514 // OpenCL v1.2, s6.9 -- Kernels can only have return type void. 6515 if (!NewFD->getResultType()->isVoidType()) { 6516 Diag(D.getIdentifierLoc(), 6517 diag::err_expected_kernel_void_return_type); 6518 D.setInvalidType(); 6519 } 6520 6521 for (FunctionDecl::param_iterator PI = NewFD->param_begin(), 6522 PE = NewFD->param_end(); PI != PE; ++PI) { 6523 ParmVarDecl *Param = *PI; 6524 QualType PT = Param->getType(); 6525 6526 // OpenCL v1.2 s6.9.a: 6527 // A kernel function argument cannot be declared as a 6528 // pointer to a pointer type. 6529 if (PT->isPointerType() && PT->getPointeeType()->isPointerType()) { 6530 Diag(Param->getLocation(), diag::err_opencl_ptrptr_kernel_arg); 6531 D.setInvalidType(); 6532 } 6533 6534 // OpenCL v1.2 s6.8 n: 6535 // A kernel function argument cannot be declared 6536 // of event_t type. 6537 if (PT->isEventT()) { 6538 Diag(Param->getLocation(), diag::err_event_t_kernel_arg); 6539 D.setInvalidType(); 6540 } 6541 } 6542 } 6543 6544 MarkUnusedFileScopedDecl(NewFD); 6545 6546 if (getLangOpts().CUDA) 6547 if (IdentifierInfo *II = NewFD->getIdentifier()) 6548 if (!NewFD->isInvalidDecl() && 6549 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 6550 if (II->isStr("cudaConfigureCall")) { 6551 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 6552 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 6553 6554 Context.setcudaConfigureCallDecl(NewFD); 6555 } 6556 } 6557 6558 // Here we have an function template explicit specialization at class scope. 6559 // The actually specialization will be postponed to template instatiation 6560 // time via the ClassScopeFunctionSpecializationDecl node. 6561 if (isDependentClassScopeExplicitSpecialization) { 6562 ClassScopeFunctionSpecializationDecl *NewSpec = 6563 ClassScopeFunctionSpecializationDecl::Create( 6564 Context, CurContext, SourceLocation(), 6565 cast<CXXMethodDecl>(NewFD), 6566 HasExplicitTemplateArgs, TemplateArgs); 6567 CurContext->addDecl(NewSpec); 6568 AddToScope = false; 6569 } 6570 6571 return NewFD; 6572 } 6573 6574 /// \brief Perform semantic checking of a new function declaration. 6575 /// 6576 /// Performs semantic analysis of the new function declaration 6577 /// NewFD. This routine performs all semantic checking that does not 6578 /// require the actual declarator involved in the declaration, and is 6579 /// used both for the declaration of functions as they are parsed 6580 /// (called via ActOnDeclarator) and for the declaration of functions 6581 /// that have been instantiated via C++ template instantiation (called 6582 /// via InstantiateDecl). 6583 /// 6584 /// \param IsExplicitSpecialization whether this new function declaration is 6585 /// an explicit specialization of the previous declaration. 6586 /// 6587 /// This sets NewFD->isInvalidDecl() to true if there was an error. 6588 /// 6589 /// \returns true if the function declaration is a redeclaration. 6590 bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 6591 LookupResult &Previous, 6592 bool IsExplicitSpecialization) { 6593 assert(!NewFD->getResultType()->isVariablyModifiedType() 6594 && "Variably modified return types are not handled here"); 6595 6596 // Check for a previous declaration of this name. 6597 if (Previous.empty() && mayConflictWithNonVisibleExternC(NewFD)) { 6598 // Since we did not find anything by this name, look for a non-visible 6599 // extern "C" declaration with the same name. 6600 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6601 = findLocallyScopedExternCDecl(NewFD->getDeclName()); 6602 if (Pos != LocallyScopedExternCDecls.end()) 6603 Previous.addDecl(Pos->second); 6604 } 6605 6606 // Filter out any non-conflicting previous declarations. 6607 filterNonConflictingPreviousDecls(Context, NewFD, Previous); 6608 6609 bool Redeclaration = false; 6610 NamedDecl *OldDecl = 0; 6611 6612 // Merge or overload the declaration with an existing declaration of 6613 // the same name, if appropriate. 6614 if (!Previous.empty()) { 6615 // Determine whether NewFD is an overload of PrevDecl or 6616 // a declaration that requires merging. If it's an overload, 6617 // there's no more work to do here; we'll just add the new 6618 // function to the scope. 6619 if (!AllowOverloadingOfFunction(Previous, Context)) { 6620 Redeclaration = true; 6621 OldDecl = Previous.getFoundDecl(); 6622 } else { 6623 switch (CheckOverload(S, NewFD, Previous, OldDecl, 6624 /*NewIsUsingDecl*/ false)) { 6625 case Ovl_Match: 6626 Redeclaration = true; 6627 break; 6628 6629 case Ovl_NonFunction: 6630 Redeclaration = true; 6631 break; 6632 6633 case Ovl_Overload: 6634 Redeclaration = false; 6635 break; 6636 } 6637 6638 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 6639 // If a function name is overloadable in C, then every function 6640 // with that name must be marked "overloadable". 6641 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 6642 << Redeclaration << NewFD; 6643 NamedDecl *OverloadedDecl = 0; 6644 if (Redeclaration) 6645 OverloadedDecl = OldDecl; 6646 else if (!Previous.empty()) 6647 OverloadedDecl = Previous.getRepresentativeDecl(); 6648 if (OverloadedDecl) 6649 Diag(OverloadedDecl->getLocation(), 6650 diag::note_attribute_overloadable_prev_overload); 6651 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 6652 Context)); 6653 } 6654 } 6655 } 6656 6657 // C++11 [dcl.constexpr]p8: 6658 // A constexpr specifier for a non-static member function that is not 6659 // a constructor declares that member function to be const. 6660 // 6661 // This needs to be delayed until we know whether this is an out-of-line 6662 // definition of a static member function. 6663 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 6664 if (MD && MD->isConstexpr() && !MD->isStatic() && 6665 !isa<CXXConstructorDecl>(MD) && 6666 (MD->getTypeQualifiers() & Qualifiers::Const) == 0) { 6667 CXXMethodDecl *OldMD = dyn_cast_or_null<CXXMethodDecl>(OldDecl); 6668 if (FunctionTemplateDecl *OldTD = 6669 dyn_cast_or_null<FunctionTemplateDecl>(OldDecl)) 6670 OldMD = dyn_cast<CXXMethodDecl>(OldTD->getTemplatedDecl()); 6671 if (!OldMD || !OldMD->isStatic()) { 6672 const FunctionProtoType *FPT = 6673 MD->getType()->castAs<FunctionProtoType>(); 6674 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 6675 EPI.TypeQuals |= Qualifiers::Const; 6676 MD->setType(Context.getFunctionType(FPT->getResultType(), 6677 ArrayRef<QualType>(FPT->arg_type_begin(), 6678 FPT->getNumArgs()), 6679 EPI)); 6680 } 6681 } 6682 6683 if (Redeclaration) { 6684 // NewFD and OldDecl represent declarations that need to be 6685 // merged. 6686 if (MergeFunctionDecl(NewFD, OldDecl, S)) { 6687 NewFD->setInvalidDecl(); 6688 return Redeclaration; 6689 } 6690 6691 Previous.clear(); 6692 Previous.addDecl(OldDecl); 6693 6694 if (FunctionTemplateDecl *OldTemplateDecl 6695 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 6696 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 6697 FunctionTemplateDecl *NewTemplateDecl 6698 = NewFD->getDescribedFunctionTemplate(); 6699 assert(NewTemplateDecl && "Template/non-template mismatch"); 6700 if (CXXMethodDecl *Method 6701 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 6702 Method->setAccess(OldTemplateDecl->getAccess()); 6703 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 6704 } 6705 6706 // If this is an explicit specialization of a member that is a function 6707 // template, mark it as a member specialization. 6708 if (IsExplicitSpecialization && 6709 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 6710 NewTemplateDecl->setMemberSpecialization(); 6711 assert(OldTemplateDecl->isMemberSpecialization()); 6712 } 6713 6714 } else { 6715 // This needs to happen first so that 'inline' propagates. 6716 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 6717 6718 if (isa<CXXMethodDecl>(NewFD)) { 6719 // A valid redeclaration of a C++ method must be out-of-line, 6720 // but (unfortunately) it's not necessarily a definition 6721 // because of templates, which means that the previous 6722 // declaration is not necessarily from the class definition. 6723 6724 // For just setting the access, that doesn't matter. 6725 CXXMethodDecl *oldMethod = cast<CXXMethodDecl>(OldDecl); 6726 NewFD->setAccess(oldMethod->getAccess()); 6727 6728 // Update the key-function state if necessary for this ABI. 6729 if (NewFD->isInlined() && 6730 !Context.getTargetInfo().getCXXABI().canKeyFunctionBeInline()) { 6731 // setNonKeyFunction needs to work with the original 6732 // declaration from the class definition, and isVirtual() is 6733 // just faster in that case, so map back to that now. 6734 oldMethod = cast<CXXMethodDecl>(oldMethod->getFirstDeclaration()); 6735 if (oldMethod->isVirtual()) { 6736 Context.setNonKeyFunction(oldMethod); 6737 } 6738 } 6739 } 6740 } 6741 } 6742 6743 // Semantic checking for this function declaration (in isolation). 6744 if (getLangOpts().CPlusPlus) { 6745 // C++-specific checks. 6746 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 6747 CheckConstructor(Constructor); 6748 } else if (CXXDestructorDecl *Destructor = 6749 dyn_cast<CXXDestructorDecl>(NewFD)) { 6750 CXXRecordDecl *Record = Destructor->getParent(); 6751 QualType ClassType = Context.getTypeDeclType(Record); 6752 6753 // FIXME: Shouldn't we be able to perform this check even when the class 6754 // type is dependent? Both gcc and edg can handle that. 6755 if (!ClassType->isDependentType()) { 6756 DeclarationName Name 6757 = Context.DeclarationNames.getCXXDestructorName( 6758 Context.getCanonicalType(ClassType)); 6759 if (NewFD->getDeclName() != Name) { 6760 Diag(NewFD->getLocation(), diag::err_destructor_name); 6761 NewFD->setInvalidDecl(); 6762 return Redeclaration; 6763 } 6764 } 6765 } else if (CXXConversionDecl *Conversion 6766 = dyn_cast<CXXConversionDecl>(NewFD)) { 6767 ActOnConversionDeclarator(Conversion); 6768 } 6769 6770 // Find any virtual functions that this function overrides. 6771 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 6772 if (!Method->isFunctionTemplateSpecialization() && 6773 !Method->getDescribedFunctionTemplate() && 6774 Method->isCanonicalDecl()) { 6775 if (AddOverriddenMethods(Method->getParent(), Method)) { 6776 // If the function was marked as "static", we have a problem. 6777 if (NewFD->getStorageClass() == SC_Static) { 6778 ReportOverrides(*this, diag::err_static_overrides_virtual, Method); 6779 } 6780 } 6781 } 6782 6783 if (Method->isStatic()) 6784 checkThisInStaticMemberFunctionType(Method); 6785 } 6786 6787 // Extra checking for C++ overloaded operators (C++ [over.oper]). 6788 if (NewFD->isOverloadedOperator() && 6789 CheckOverloadedOperatorDeclaration(NewFD)) { 6790 NewFD->setInvalidDecl(); 6791 return Redeclaration; 6792 } 6793 6794 // Extra checking for C++0x literal operators (C++0x [over.literal]). 6795 if (NewFD->getLiteralIdentifier() && 6796 CheckLiteralOperatorDeclaration(NewFD)) { 6797 NewFD->setInvalidDecl(); 6798 return Redeclaration; 6799 } 6800 6801 // In C++, check default arguments now that we have merged decls. Unless 6802 // the lexical context is the class, because in this case this is done 6803 // during delayed parsing anyway. 6804 if (!CurContext->isRecord()) 6805 CheckCXXDefaultArguments(NewFD); 6806 6807 // If this function declares a builtin function, check the type of this 6808 // declaration against the expected type for the builtin. 6809 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 6810 ASTContext::GetBuiltinTypeError Error; 6811 LookupPredefedObjCSuperType(*this, S, NewFD->getIdentifier()); 6812 QualType T = Context.GetBuiltinType(BuiltinID, Error); 6813 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 6814 // The type of this function differs from the type of the builtin, 6815 // so forget about the builtin entirely. 6816 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 6817 } 6818 } 6819 6820 // If this function is declared as being extern "C", then check to see if 6821 // the function returns a UDT (class, struct, or union type) that is not C 6822 // compatible, and if it does, warn the user. 6823 // But, issue any diagnostic on the first declaration only. 6824 if (NewFD->isExternC() && Previous.empty()) { 6825 QualType R = NewFD->getResultType(); 6826 if (R->isIncompleteType() && !R->isVoidType()) 6827 Diag(NewFD->getLocation(), diag::warn_return_value_udt_incomplete) 6828 << NewFD << R; 6829 else if (!R.isPODType(Context) && !R->isVoidType() && 6830 !R->isObjCObjectPointerType()) 6831 Diag(NewFD->getLocation(), diag::warn_return_value_udt) << NewFD << R; 6832 } 6833 } 6834 return Redeclaration; 6835 } 6836 6837 static SourceRange getResultSourceRange(const FunctionDecl *FD) { 6838 const TypeSourceInfo *TSI = FD->getTypeSourceInfo(); 6839 if (!TSI) 6840 return SourceRange(); 6841 6842 TypeLoc TL = TSI->getTypeLoc(); 6843 FunctionTypeLoc FunctionTL = TL.getAs<FunctionTypeLoc>(); 6844 if (!FunctionTL) 6845 return SourceRange(); 6846 6847 TypeLoc ResultTL = FunctionTL.getResultLoc(); 6848 if (ResultTL.getUnqualifiedLoc().getAs<BuiltinTypeLoc>()) 6849 return ResultTL.getSourceRange(); 6850 6851 return SourceRange(); 6852 } 6853 6854 void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 6855 // C++11 [basic.start.main]p3: A program that declares main to be inline, 6856 // static or constexpr is ill-formed. 6857 // C11 6.7.4p4: In a hosted environment, no function specifier(s) shall 6858 // appear in a declaration of main. 6859 // static main is not an error under C99, but we should warn about it. 6860 // We accept _Noreturn main as an extension. 6861 if (FD->getStorageClass() == SC_Static) 6862 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus 6863 ? diag::err_static_main : diag::warn_static_main) 6864 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 6865 if (FD->isInlineSpecified()) 6866 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 6867 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 6868 if (DS.isNoreturnSpecified()) { 6869 SourceLocation NoreturnLoc = DS.getNoreturnSpecLoc(); 6870 SourceRange NoreturnRange(NoreturnLoc, 6871 PP.getLocForEndOfToken(NoreturnLoc)); 6872 Diag(NoreturnLoc, diag::ext_noreturn_main); 6873 Diag(NoreturnLoc, diag::note_main_remove_noreturn) 6874 << FixItHint::CreateRemoval(NoreturnRange); 6875 } 6876 if (FD->isConstexpr()) { 6877 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 6878 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 6879 FD->setConstexpr(false); 6880 } 6881 6882 QualType T = FD->getType(); 6883 assert(T->isFunctionType() && "function decl is not of function type"); 6884 const FunctionType* FT = T->castAs<FunctionType>(); 6885 6886 // All the standards say that main() should should return 'int'. 6887 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 6888 // In C and C++, main magically returns 0 if you fall off the end; 6889 // set the flag which tells us that. 6890 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6891 FD->setHasImplicitReturnZero(true); 6892 6893 // In C with GNU extensions we allow main() to have non-integer return 6894 // type, but we should warn about the extension, and we disable the 6895 // implicit-return-zero rule. 6896 } else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) { 6897 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); 6898 6899 SourceRange ResultRange = getResultSourceRange(FD); 6900 if (ResultRange.isValid()) 6901 Diag(ResultRange.getBegin(), diag::note_main_change_return_type) 6902 << FixItHint::CreateReplacement(ResultRange, "int"); 6903 6904 // Otherwise, this is just a flat-out error. 6905 } else { 6906 SourceRange ResultRange = getResultSourceRange(FD); 6907 if (ResultRange.isValid()) 6908 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint) 6909 << FixItHint::CreateReplacement(ResultRange, "int"); 6910 else 6911 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 6912 6913 FD->setInvalidDecl(true); 6914 } 6915 6916 // Treat protoless main() as nullary. 6917 if (isa<FunctionNoProtoType>(FT)) return; 6918 6919 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 6920 unsigned nparams = FTP->getNumArgs(); 6921 assert(FD->getNumParams() == nparams); 6922 6923 bool HasExtraParameters = (nparams > 3); 6924 6925 // Darwin passes an undocumented fourth argument of type char**. If 6926 // other platforms start sprouting these, the logic below will start 6927 // getting shifty. 6928 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 6929 HasExtraParameters = false; 6930 6931 if (HasExtraParameters) { 6932 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 6933 FD->setInvalidDecl(true); 6934 nparams = 3; 6935 } 6936 6937 // FIXME: a lot of the following diagnostics would be improved 6938 // if we had some location information about types. 6939 6940 QualType CharPP = 6941 Context.getPointerType(Context.getPointerType(Context.CharTy)); 6942 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 6943 6944 for (unsigned i = 0; i < nparams; ++i) { 6945 QualType AT = FTP->getArgType(i); 6946 6947 bool mismatch = true; 6948 6949 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 6950 mismatch = false; 6951 else if (Expected[i] == CharPP) { 6952 // As an extension, the following forms are okay: 6953 // char const ** 6954 // char const * const * 6955 // char * const * 6956 6957 QualifierCollector qs; 6958 const PointerType* PT; 6959 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 6960 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 6961 Context.hasSameType(QualType(qs.strip(PT->getPointeeType()), 0), 6962 Context.CharTy)) { 6963 qs.removeConst(); 6964 mismatch = !qs.empty(); 6965 } 6966 } 6967 6968 if (mismatch) { 6969 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 6970 // TODO: suggest replacing given type with expected type 6971 FD->setInvalidDecl(true); 6972 } 6973 } 6974 6975 if (nparams == 1 && !FD->isInvalidDecl()) { 6976 Diag(FD->getLocation(), diag::warn_main_one_arg); 6977 } 6978 6979 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 6980 Diag(FD->getLocation(), diag::err_main_template_decl); 6981 FD->setInvalidDecl(); 6982 } 6983 } 6984 6985 bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 6986 // FIXME: Need strict checking. In C89, we need to check for 6987 // any assignment, increment, decrement, function-calls, or 6988 // commas outside of a sizeof. In C99, it's the same list, 6989 // except that the aforementioned are allowed in unevaluated 6990 // expressions. Everything else falls under the 6991 // "may accept other forms of constant expressions" exception. 6992 // (We never end up here for C++, so the constant expression 6993 // rules there don't matter.) 6994 if (Init->isConstantInitializer(Context, false)) 6995 return false; 6996 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 6997 << Init->getSourceRange(); 6998 return true; 6999 } 7000 7001 namespace { 7002 // Visits an initialization expression to see if OrigDecl is evaluated in 7003 // its own initialization and throws a warning if it does. 7004 class SelfReferenceChecker 7005 : public EvaluatedExprVisitor<SelfReferenceChecker> { 7006 Sema &S; 7007 Decl *OrigDecl; 7008 bool isRecordType; 7009 bool isPODType; 7010 bool isReferenceType; 7011 7012 public: 7013 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 7014 7015 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 7016 S(S), OrigDecl(OrigDecl) { 7017 isPODType = false; 7018 isRecordType = false; 7019 isReferenceType = false; 7020 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 7021 isPODType = VD->getType().isPODType(S.Context); 7022 isRecordType = VD->getType()->isRecordType(); 7023 isReferenceType = VD->getType()->isReferenceType(); 7024 } 7025 } 7026 7027 // For most expressions, the cast is directly above the DeclRefExpr. 7028 // For conditional operators, the cast can be outside the conditional 7029 // operator if both expressions are DeclRefExpr's. 7030 void HandleValue(Expr *E) { 7031 if (isReferenceType) 7032 return; 7033 E = E->IgnoreParenImpCasts(); 7034 if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) { 7035 HandleDeclRefExpr(DRE); 7036 return; 7037 } 7038 7039 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 7040 HandleValue(CO->getTrueExpr()); 7041 HandleValue(CO->getFalseExpr()); 7042 return; 7043 } 7044 7045 if (isa<MemberExpr>(E)) { 7046 Expr *Base = E->IgnoreParenImpCasts(); 7047 while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) { 7048 // Check for static member variables and don't warn on them. 7049 if (!isa<FieldDecl>(ME->getMemberDecl())) 7050 return; 7051 Base = ME->getBase()->IgnoreParenImpCasts(); 7052 } 7053 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base)) 7054 HandleDeclRefExpr(DRE); 7055 return; 7056 } 7057 } 7058 7059 // Reference types are handled here since all uses of references are 7060 // bad, not just r-value uses. 7061 void VisitDeclRefExpr(DeclRefExpr *E) { 7062 if (isReferenceType) 7063 HandleDeclRefExpr(E); 7064 } 7065 7066 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 7067 if (E->getCastKind() == CK_LValueToRValue || 7068 (isRecordType && E->getCastKind() == CK_NoOp)) 7069 HandleValue(E->getSubExpr()); 7070 7071 Inherited::VisitImplicitCastExpr(E); 7072 } 7073 7074 void VisitMemberExpr(MemberExpr *E) { 7075 // Don't warn on arrays since they can be treated as pointers. 7076 if (E->getType()->canDecayToPointerType()) return; 7077 7078 // Warn when a non-static method call is followed by non-static member 7079 // field accesses, which is followed by a DeclRefExpr. 7080 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl()); 7081 bool Warn = (MD && !MD->isStatic()); 7082 Expr *Base = E->getBase()->IgnoreParenImpCasts(); 7083 while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) { 7084 if (!isa<FieldDecl>(ME->getMemberDecl())) 7085 Warn = false; 7086 Base = ME->getBase()->IgnoreParenImpCasts(); 7087 } 7088 7089 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base)) { 7090 if (Warn) 7091 HandleDeclRefExpr(DRE); 7092 return; 7093 } 7094 7095 // The base of a MemberExpr is not a MemberExpr or a DeclRefExpr. 7096 // Visit that expression. 7097 Visit(Base); 7098 } 7099 7100 void VisitUnaryOperator(UnaryOperator *E) { 7101 // For POD record types, addresses of its own members are well-defined. 7102 if (E->getOpcode() == UO_AddrOf && isRecordType && 7103 isa<MemberExpr>(E->getSubExpr()->IgnoreParens())) { 7104 if (!isPODType) 7105 HandleValue(E->getSubExpr()); 7106 return; 7107 } 7108 Inherited::VisitUnaryOperator(E); 7109 } 7110 7111 void VisitObjCMessageExpr(ObjCMessageExpr *E) { return; } 7112 7113 void HandleDeclRefExpr(DeclRefExpr *DRE) { 7114 Decl* ReferenceDecl = DRE->getDecl(); 7115 if (OrigDecl != ReferenceDecl) return; 7116 unsigned diag; 7117 if (isReferenceType) { 7118 diag = diag::warn_uninit_self_reference_in_reference_init; 7119 } else if (cast<VarDecl>(OrigDecl)->isStaticLocal()) { 7120 diag = diag::warn_static_self_reference_in_init; 7121 } else { 7122 diag = diag::warn_uninit_self_reference_in_init; 7123 } 7124 7125 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 7126 S.PDiag(diag) 7127 << DRE->getNameInfo().getName() 7128 << OrigDecl->getLocation() 7129 << DRE->getSourceRange()); 7130 } 7131 }; 7132 7133 /// CheckSelfReference - Warns if OrigDecl is used in expression E. 7134 static void CheckSelfReference(Sema &S, Decl* OrigDecl, Expr *E, 7135 bool DirectInit) { 7136 // Parameters arguments are occassionially constructed with itself, 7137 // for instance, in recursive functions. Skip them. 7138 if (isa<ParmVarDecl>(OrigDecl)) 7139 return; 7140 7141 E = E->IgnoreParens(); 7142 7143 // Skip checking T a = a where T is not a record or reference type. 7144 // Doing so is a way to silence uninitialized warnings. 7145 if (!DirectInit && !cast<VarDecl>(OrigDecl)->getType()->isRecordType()) 7146 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 7147 if (ICE->getCastKind() == CK_LValueToRValue) 7148 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr())) 7149 if (DRE->getDecl() == OrigDecl) 7150 return; 7151 7152 SelfReferenceChecker(S, OrigDecl).Visit(E); 7153 } 7154 } 7155 7156 /// AddInitializerToDecl - Adds the initializer Init to the 7157 /// declaration dcl. If DirectInit is true, this is C++ direct 7158 /// initialization rather than copy initialization. 7159 void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 7160 bool DirectInit, bool TypeMayContainAuto) { 7161 // If there is no declaration, there was an error parsing it. Just ignore 7162 // the initializer. 7163 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 7164 return; 7165 7166 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 7167 // With declarators parsed the way they are, the parser cannot 7168 // distinguish between a normal initializer and a pure-specifier. 7169 // Thus this grotesque test. 7170 IntegerLiteral *IL; 7171 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 7172 Context.getCanonicalType(IL->getType()) == Context.IntTy) 7173 CheckPureMethod(Method, Init->getSourceRange()); 7174 else { 7175 Diag(Method->getLocation(), diag::err_member_function_initialization) 7176 << Method->getDeclName() << Init->getSourceRange(); 7177 Method->setInvalidDecl(); 7178 } 7179 return; 7180 } 7181 7182 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7183 if (!VDecl) { 7184 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 7185 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7186 RealDecl->setInvalidDecl(); 7187 return; 7188 } 7189 7190 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); 7191 7192 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7193 AutoType *Auto = 0; 7194 if (TypeMayContainAuto && 7195 (Auto = VDecl->getType()->getContainedAutoType()) && 7196 !Auto->isDeduced()) { 7197 Expr *DeduceInit = Init; 7198 // Initializer could be a C++ direct-initializer. Deduction only works if it 7199 // contains exactly one expression. 7200 if (CXXDirectInit) { 7201 if (CXXDirectInit->getNumExprs() == 0) { 7202 // It isn't possible to write this directly, but it is possible to 7203 // end up in this situation with "auto x(some_pack...);" 7204 Diag(CXXDirectInit->getLocStart(), 7205 diag::err_auto_var_init_no_expression) 7206 << VDecl->getDeclName() << VDecl->getType() 7207 << VDecl->getSourceRange(); 7208 RealDecl->setInvalidDecl(); 7209 return; 7210 } else if (CXXDirectInit->getNumExprs() > 1) { 7211 Diag(CXXDirectInit->getExpr(1)->getLocStart(), 7212 diag::err_auto_var_init_multiple_expressions) 7213 << VDecl->getDeclName() << VDecl->getType() 7214 << VDecl->getSourceRange(); 7215 RealDecl->setInvalidDecl(); 7216 return; 7217 } else { 7218 DeduceInit = CXXDirectInit->getExpr(0); 7219 } 7220 } 7221 7222 // Expressions default to 'id' when we're in a debugger. 7223 bool DefaultedToAuto = false; 7224 if (getLangOpts().DebuggerCastResultToId && 7225 Init->getType() == Context.UnknownAnyTy) { 7226 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); 7227 if (Result.isInvalid()) { 7228 VDecl->setInvalidDecl(); 7229 return; 7230 } 7231 Init = Result.take(); 7232 DefaultedToAuto = true; 7233 } 7234 7235 TypeSourceInfo *DeducedType = 0; 7236 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) == 7237 DAR_Failed) 7238 DiagnoseAutoDeductionFailure(VDecl, DeduceInit); 7239 if (!DeducedType) { 7240 RealDecl->setInvalidDecl(); 7241 return; 7242 } 7243 VDecl->setTypeSourceInfo(DeducedType); 7244 VDecl->setType(DeducedType->getType()); 7245 assert(VDecl->isLinkageValid()); 7246 7247 // In ARC, infer lifetime. 7248 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 7249 VDecl->setInvalidDecl(); 7250 7251 // Warn if we deduced 'id'. 'auto' usually implies type-safety, but using 7252 // 'id' instead of a specific object type prevents most of our usual checks. 7253 // We only want to warn outside of template instantiations, though: 7254 // inside a template, the 'id' could have come from a parameter. 7255 if (ActiveTemplateInstantiations.empty() && !DefaultedToAuto && 7256 DeducedType->getType()->isObjCIdType()) { 7257 SourceLocation Loc = DeducedType->getTypeLoc().getBeginLoc(); 7258 Diag(Loc, diag::warn_auto_var_is_id) 7259 << VDecl->getDeclName() << DeduceInit->getSourceRange(); 7260 } 7261 7262 // If this is a redeclaration, check that the type we just deduced matches 7263 // the previously declared type. 7264 if (VarDecl *Old = VDecl->getPreviousDecl()) 7265 MergeVarDeclTypes(VDecl, Old); 7266 } 7267 7268 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 7269 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 7270 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 7271 VDecl->setInvalidDecl(); 7272 return; 7273 } 7274 7275 if (!VDecl->getType()->isDependentType()) { 7276 // A definition must end up with a complete type, which means it must be 7277 // complete with the restriction that an array type might be completed by 7278 // the initializer; note that later code assumes this restriction. 7279 QualType BaseDeclType = VDecl->getType(); 7280 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 7281 BaseDeclType = Array->getElementType(); 7282 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 7283 diag::err_typecheck_decl_incomplete_type)) { 7284 RealDecl->setInvalidDecl(); 7285 return; 7286 } 7287 7288 // The variable can not have an abstract class type. 7289 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7290 diag::err_abstract_type_in_decl, 7291 AbstractVariableType)) 7292 VDecl->setInvalidDecl(); 7293 } 7294 7295 const VarDecl *Def; 7296 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7297 Diag(VDecl->getLocation(), diag::err_redefinition) 7298 << VDecl->getDeclName(); 7299 Diag(Def->getLocation(), diag::note_previous_definition); 7300 VDecl->setInvalidDecl(); 7301 return; 7302 } 7303 7304 const VarDecl* PrevInit = 0; 7305 if (getLangOpts().CPlusPlus) { 7306 // C++ [class.static.data]p4 7307 // If a static data member is of const integral or const 7308 // enumeration type, its declaration in the class definition can 7309 // specify a constant-initializer which shall be an integral 7310 // constant expression (5.19). In that case, the member can appear 7311 // in integral constant expressions. The member shall still be 7312 // defined in a namespace scope if it is used in the program and the 7313 // namespace scope definition shall not contain an initializer. 7314 // 7315 // We already performed a redefinition check above, but for static 7316 // data members we also need to check whether there was an in-class 7317 // declaration with an initializer. 7318 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7319 Diag(VDecl->getLocation(), diag::err_redefinition) 7320 << VDecl->getDeclName(); 7321 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7322 return; 7323 } 7324 7325 if (VDecl->hasLocalStorage()) 7326 getCurFunction()->setHasBranchProtectedScope(); 7327 7328 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 7329 VDecl->setInvalidDecl(); 7330 return; 7331 } 7332 } 7333 7334 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 7335 // a kernel function cannot be initialized." 7336 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 7337 Diag(VDecl->getLocation(), diag::err_local_cant_init); 7338 VDecl->setInvalidDecl(); 7339 return; 7340 } 7341 7342 // Get the decls type and save a reference for later, since 7343 // CheckInitializerTypes may change it. 7344 QualType DclT = VDecl->getType(), SavT = DclT; 7345 7346 // Expressions default to 'id' when we're in a debugger 7347 // and we are assigning it to a variable of Objective-C pointer type. 7348 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCObjectPointerType() && 7349 Init->getType() == Context.UnknownAnyTy) { 7350 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); 7351 if (Result.isInvalid()) { 7352 VDecl->setInvalidDecl(); 7353 return; 7354 } 7355 Init = Result.take(); 7356 } 7357 7358 // Perform the initialization. 7359 if (!VDecl->isInvalidDecl()) { 7360 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7361 InitializationKind Kind 7362 = DirectInit ? 7363 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 7364 Init->getLocStart(), 7365 Init->getLocEnd()) 7366 : InitializationKind::CreateDirectList( 7367 VDecl->getLocation()) 7368 : InitializationKind::CreateCopy(VDecl->getLocation(), 7369 Init->getLocStart()); 7370 7371 Expr **Args = &Init; 7372 unsigned NumArgs = 1; 7373 if (CXXDirectInit) { 7374 Args = CXXDirectInit->getExprs(); 7375 NumArgs = CXXDirectInit->getNumExprs(); 7376 } 7377 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs); 7378 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 7379 MultiExprArg(Args, NumArgs), &DclT); 7380 if (Result.isInvalid()) { 7381 VDecl->setInvalidDecl(); 7382 return; 7383 } 7384 7385 Init = Result.takeAs<Expr>(); 7386 } 7387 7388 // Check for self-references within variable initializers. 7389 // Variables declared within a function/method body (except for references) 7390 // are handled by a dataflow analysis. 7391 if (!VDecl->hasLocalStorage() || VDecl->getType()->isRecordType() || 7392 VDecl->getType()->isReferenceType()) { 7393 CheckSelfReference(*this, RealDecl, Init, DirectInit); 7394 } 7395 7396 // If the type changed, it means we had an incomplete type that was 7397 // completed by the initializer. For example: 7398 // int ary[] = { 1, 3, 5 }; 7399 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 7400 if (!VDecl->isInvalidDecl() && (DclT != SavT)) 7401 VDecl->setType(DclT); 7402 7403 if (!VDecl->isInvalidDecl()) { 7404 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 7405 7406 if (VDecl->hasAttr<BlocksAttr>()) 7407 checkRetainCycles(VDecl, Init); 7408 7409 // It is safe to assign a weak reference into a strong variable. 7410 // Although this code can still have problems: 7411 // id x = self.weakProp; 7412 // id y = self.weakProp; 7413 // we do not warn to warn spuriously when 'x' and 'y' are on separate 7414 // paths through the function. This should be revisited if 7415 // -Wrepeated-use-of-weak is made flow-sensitive. 7416 if (VDecl->getType().getObjCLifetime() == Qualifiers::OCL_Strong) { 7417 DiagnosticsEngine::Level Level = 7418 Diags.getDiagnosticLevel(diag::warn_arc_repeated_use_of_weak, 7419 Init->getLocStart()); 7420 if (Level != DiagnosticsEngine::Ignored) 7421 getCurFunction()->markSafeWeakUse(Init); 7422 } 7423 } 7424 7425 // The initialization is usually a full-expression. 7426 // 7427 // FIXME: If this is a braced initialization of an aggregate, it is not 7428 // an expression, and each individual field initializer is a separate 7429 // full-expression. For instance, in: 7430 // 7431 // struct Temp { ~Temp(); }; 7432 // struct S { S(Temp); }; 7433 // struct T { S a, b; } t = { Temp(), Temp() } 7434 // 7435 // we should destroy the first Temp before constructing the second. 7436 ExprResult Result = ActOnFinishFullExpr(Init, VDecl->getLocation(), 7437 false, 7438 VDecl->isConstexpr()); 7439 if (Result.isInvalid()) { 7440 VDecl->setInvalidDecl(); 7441 return; 7442 } 7443 Init = Result.take(); 7444 7445 // Attach the initializer to the decl. 7446 VDecl->setInit(Init); 7447 7448 if (VDecl->isLocalVarDecl()) { 7449 // C99 6.7.8p4: All the expressions in an initializer for an object that has 7450 // static storage duration shall be constant expressions or string literals. 7451 // C++ does not have this restriction. 7452 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() && 7453 VDecl->getStorageClass() == SC_Static) 7454 CheckForConstantInitializer(Init, DclT); 7455 } else if (VDecl->isStaticDataMember() && 7456 VDecl->getLexicalDeclContext()->isRecord()) { 7457 // This is an in-class initialization for a static data member, e.g., 7458 // 7459 // struct S { 7460 // static const int value = 17; 7461 // }; 7462 7463 // C++ [class.mem]p4: 7464 // A member-declarator can contain a constant-initializer only 7465 // if it declares a static member (9.4) of const integral or 7466 // const enumeration type, see 9.4.2. 7467 // 7468 // C++11 [class.static.data]p3: 7469 // If a non-volatile const static data member is of integral or 7470 // enumeration type, its declaration in the class definition can 7471 // specify a brace-or-equal-initializer in which every initalizer-clause 7472 // that is an assignment-expression is a constant expression. A static 7473 // data member of literal type can be declared in the class definition 7474 // with the constexpr specifier; if so, its declaration shall specify a 7475 // brace-or-equal-initializer in which every initializer-clause that is 7476 // an assignment-expression is a constant expression. 7477 7478 // Do nothing on dependent types. 7479 if (DclT->isDependentType()) { 7480 7481 // Allow any 'static constexpr' members, whether or not they are of literal 7482 // type. We separately check that every constexpr variable is of literal 7483 // type. 7484 } else if (VDecl->isConstexpr()) { 7485 7486 // Require constness. 7487 } else if (!DclT.isConstQualified()) { 7488 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 7489 << Init->getSourceRange(); 7490 VDecl->setInvalidDecl(); 7491 7492 // We allow integer constant expressions in all cases. 7493 } else if (DclT->isIntegralOrEnumerationType()) { 7494 // Check whether the expression is a constant expression. 7495 SourceLocation Loc; 7496 if (getLangOpts().CPlusPlus11 && DclT.isVolatileQualified()) 7497 // In C++11, a non-constexpr const static data member with an 7498 // in-class initializer cannot be volatile. 7499 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 7500 else if (Init->isValueDependent()) 7501 ; // Nothing to check. 7502 else if (Init->isIntegerConstantExpr(Context, &Loc)) 7503 ; // Ok, it's an ICE! 7504 else if (Init->isEvaluatable(Context)) { 7505 // If we can constant fold the initializer through heroics, accept it, 7506 // but report this as a use of an extension for -pedantic. 7507 Diag(Loc, diag::ext_in_class_initializer_non_constant) 7508 << Init->getSourceRange(); 7509 } else { 7510 // Otherwise, this is some crazy unknown case. Report the issue at the 7511 // location provided by the isIntegerConstantExpr failed check. 7512 Diag(Loc, diag::err_in_class_initializer_non_constant) 7513 << Init->getSourceRange(); 7514 VDecl->setInvalidDecl(); 7515 } 7516 7517 // We allow foldable floating-point constants as an extension. 7518 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 7519 // In C++98, this is a GNU extension. In C++11, it is not, but we support 7520 // it anyway and provide a fixit to add the 'constexpr'. 7521 if (getLangOpts().CPlusPlus11) { 7522 Diag(VDecl->getLocation(), 7523 diag::ext_in_class_initializer_float_type_cxx11) 7524 << DclT << Init->getSourceRange(); 7525 Diag(VDecl->getLocStart(), 7526 diag::note_in_class_initializer_float_type_cxx11) 7527 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 7528 } else { 7529 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 7530 << DclT << Init->getSourceRange(); 7531 7532 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 7533 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 7534 << Init->getSourceRange(); 7535 VDecl->setInvalidDecl(); 7536 } 7537 } 7538 7539 // Suggest adding 'constexpr' in C++11 for literal types. 7540 } else if (getLangOpts().CPlusPlus11 && DclT->isLiteralType()) { 7541 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 7542 << DclT << Init->getSourceRange() 7543 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 7544 VDecl->setConstexpr(true); 7545 7546 } else { 7547 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 7548 << DclT << Init->getSourceRange(); 7549 VDecl->setInvalidDecl(); 7550 } 7551 } else if (VDecl->isFileVarDecl()) { 7552 if (VDecl->getStorageClassAsWritten() == SC_Extern && 7553 (!getLangOpts().CPlusPlus || 7554 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 7555 Diag(VDecl->getLocation(), diag::warn_extern_init); 7556 7557 // C99 6.7.8p4. All file scoped initializers need to be constant. 7558 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) 7559 CheckForConstantInitializer(Init, DclT); 7560 } 7561 7562 // We will represent direct-initialization similarly to copy-initialization: 7563 // int x(1); -as-> int x = 1; 7564 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7565 // 7566 // Clients that want to distinguish between the two forms, can check for 7567 // direct initializer using VarDecl::getInitStyle(). 7568 // A major benefit is that clients that don't particularly care about which 7569 // exactly form was it (like the CodeGen) can handle both cases without 7570 // special case code. 7571 7572 // C++ 8.5p11: 7573 // The form of initialization (using parentheses or '=') is generally 7574 // insignificant, but does matter when the entity being initialized has a 7575 // class type. 7576 if (CXXDirectInit) { 7577 assert(DirectInit && "Call-style initializer must be direct init."); 7578 VDecl->setInitStyle(VarDecl::CallInit); 7579 } else if (DirectInit) { 7580 // This must be list-initialization. No other way is direct-initialization. 7581 VDecl->setInitStyle(VarDecl::ListInit); 7582 } 7583 7584 CheckCompleteVariableDeclaration(VDecl); 7585 } 7586 7587 /// ActOnInitializerError - Given that there was an error parsing an 7588 /// initializer for the given declaration, try to return to some form 7589 /// of sanity. 7590 void Sema::ActOnInitializerError(Decl *D) { 7591 // Our main concern here is re-establishing invariants like "a 7592 // variable's type is either dependent or complete". 7593 if (!D || D->isInvalidDecl()) return; 7594 7595 VarDecl *VD = dyn_cast<VarDecl>(D); 7596 if (!VD) return; 7597 7598 // Auto types are meaningless if we can't make sense of the initializer. 7599 if (ParsingInitForAutoVars.count(D)) { 7600 D->setInvalidDecl(); 7601 return; 7602 } 7603 7604 QualType Ty = VD->getType(); 7605 if (Ty->isDependentType()) return; 7606 7607 // Require a complete type. 7608 if (RequireCompleteType(VD->getLocation(), 7609 Context.getBaseElementType(Ty), 7610 diag::err_typecheck_decl_incomplete_type)) { 7611 VD->setInvalidDecl(); 7612 return; 7613 } 7614 7615 // Require an abstract type. 7616 if (RequireNonAbstractType(VD->getLocation(), Ty, 7617 diag::err_abstract_type_in_decl, 7618 AbstractVariableType)) { 7619 VD->setInvalidDecl(); 7620 return; 7621 } 7622 7623 // Don't bother complaining about constructors or destructors, 7624 // though. 7625 } 7626 7627 void Sema::ActOnUninitializedDecl(Decl *RealDecl, 7628 bool TypeMayContainAuto) { 7629 // If there is no declaration, there was an error parsing it. Just ignore it. 7630 if (RealDecl == 0) 7631 return; 7632 7633 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 7634 QualType Type = Var->getType(); 7635 7636 // C++11 [dcl.spec.auto]p3 7637 if (TypeMayContainAuto && Type->getContainedAutoType()) { 7638 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 7639 << Var->getDeclName() << Type; 7640 Var->setInvalidDecl(); 7641 return; 7642 } 7643 7644 // C++11 [class.static.data]p3: A static data member can be declared with 7645 // the constexpr specifier; if so, its declaration shall specify 7646 // a brace-or-equal-initializer. 7647 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 7648 // the definition of a variable [...] or the declaration of a static data 7649 // member. 7650 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 7651 if (Var->isStaticDataMember()) 7652 Diag(Var->getLocation(), 7653 diag::err_constexpr_static_mem_var_requires_init) 7654 << Var->getDeclName(); 7655 else 7656 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 7657 Var->setInvalidDecl(); 7658 return; 7659 } 7660 7661 switch (Var->isThisDeclarationADefinition()) { 7662 case VarDecl::Definition: 7663 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 7664 break; 7665 7666 // We have an out-of-line definition of a static data member 7667 // that has an in-class initializer, so we type-check this like 7668 // a declaration. 7669 // 7670 // Fall through 7671 7672 case VarDecl::DeclarationOnly: 7673 // It's only a declaration. 7674 7675 // Block scope. C99 6.7p7: If an identifier for an object is 7676 // declared with no linkage (C99 6.2.2p6), the type for the 7677 // object shall be complete. 7678 if (!Type->isDependentType() && Var->isLocalVarDecl() && 7679 !Var->getLinkage() && !Var->isInvalidDecl() && 7680 RequireCompleteType(Var->getLocation(), Type, 7681 diag::err_typecheck_decl_incomplete_type)) 7682 Var->setInvalidDecl(); 7683 7684 // Make sure that the type is not abstract. 7685 if (!Type->isDependentType() && !Var->isInvalidDecl() && 7686 RequireNonAbstractType(Var->getLocation(), Type, 7687 diag::err_abstract_type_in_decl, 7688 AbstractVariableType)) 7689 Var->setInvalidDecl(); 7690 if (!Type->isDependentType() && !Var->isInvalidDecl() && 7691 Var->getStorageClass() == SC_PrivateExtern) { 7692 Diag(Var->getLocation(), diag::warn_private_extern); 7693 Diag(Var->getLocation(), diag::note_private_extern); 7694 } 7695 7696 return; 7697 7698 case VarDecl::TentativeDefinition: 7699 // File scope. C99 6.9.2p2: A declaration of an identifier for an 7700 // object that has file scope without an initializer, and without a 7701 // storage-class specifier or with the storage-class specifier "static", 7702 // constitutes a tentative definition. Note: A tentative definition with 7703 // external linkage is valid (C99 6.2.2p5). 7704 if (!Var->isInvalidDecl()) { 7705 if (const IncompleteArrayType *ArrayT 7706 = Context.getAsIncompleteArrayType(Type)) { 7707 if (RequireCompleteType(Var->getLocation(), 7708 ArrayT->getElementType(), 7709 diag::err_illegal_decl_array_incomplete_type)) 7710 Var->setInvalidDecl(); 7711 } else if (Var->getStorageClass() == SC_Static) { 7712 // C99 6.9.2p3: If the declaration of an identifier for an object is 7713 // a tentative definition and has internal linkage (C99 6.2.2p3), the 7714 // declared type shall not be an incomplete type. 7715 // NOTE: code such as the following 7716 // static struct s; 7717 // struct s { int a; }; 7718 // is accepted by gcc. Hence here we issue a warning instead of 7719 // an error and we do not invalidate the static declaration. 7720 // NOTE: to avoid multiple warnings, only check the first declaration. 7721 if (Var->getPreviousDecl() == 0) 7722 RequireCompleteType(Var->getLocation(), Type, 7723 diag::ext_typecheck_decl_incomplete_type); 7724 } 7725 } 7726 7727 // Record the tentative definition; we're done. 7728 if (!Var->isInvalidDecl()) 7729 TentativeDefinitions.push_back(Var); 7730 return; 7731 } 7732 7733 // Provide a specific diagnostic for uninitialized variable 7734 // definitions with incomplete array type. 7735 if (Type->isIncompleteArrayType()) { 7736 Diag(Var->getLocation(), 7737 diag::err_typecheck_incomplete_array_needs_initializer); 7738 Var->setInvalidDecl(); 7739 return; 7740 } 7741 7742 // Provide a specific diagnostic for uninitialized variable 7743 // definitions with reference type. 7744 if (Type->isReferenceType()) { 7745 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 7746 << Var->getDeclName() 7747 << SourceRange(Var->getLocation(), Var->getLocation()); 7748 Var->setInvalidDecl(); 7749 return; 7750 } 7751 7752 // Do not attempt to type-check the default initializer for a 7753 // variable with dependent type. 7754 if (Type->isDependentType()) 7755 return; 7756 7757 if (Var->isInvalidDecl()) 7758 return; 7759 7760 if (RequireCompleteType(Var->getLocation(), 7761 Context.getBaseElementType(Type), 7762 diag::err_typecheck_decl_incomplete_type)) { 7763 Var->setInvalidDecl(); 7764 return; 7765 } 7766 7767 // The variable can not have an abstract class type. 7768 if (RequireNonAbstractType(Var->getLocation(), Type, 7769 diag::err_abstract_type_in_decl, 7770 AbstractVariableType)) { 7771 Var->setInvalidDecl(); 7772 return; 7773 } 7774 7775 // Check for jumps past the implicit initializer. C++0x 7776 // clarifies that this applies to a "variable with automatic 7777 // storage duration", not a "local variable". 7778 // C++11 [stmt.dcl]p3 7779 // A program that jumps from a point where a variable with automatic 7780 // storage duration is not in scope to a point where it is in scope is 7781 // ill-formed unless the variable has scalar type, class type with a 7782 // trivial default constructor and a trivial destructor, a cv-qualified 7783 // version of one of these types, or an array of one of the preceding 7784 // types and is declared without an initializer. 7785 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) { 7786 if (const RecordType *Record 7787 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 7788 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 7789 // Mark the function for further checking even if the looser rules of 7790 // C++11 do not require such checks, so that we can diagnose 7791 // incompatibilities with C++98. 7792 if (!CXXRecord->isPOD()) 7793 getCurFunction()->setHasBranchProtectedScope(); 7794 } 7795 } 7796 7797 // C++03 [dcl.init]p9: 7798 // If no initializer is specified for an object, and the 7799 // object is of (possibly cv-qualified) non-POD class type (or 7800 // array thereof), the object shall be default-initialized; if 7801 // the object is of const-qualified type, the underlying class 7802 // type shall have a user-declared default 7803 // constructor. Otherwise, if no initializer is specified for 7804 // a non- static object, the object and its subobjects, if 7805 // any, have an indeterminate initial value); if the object 7806 // or any of its subobjects are of const-qualified type, the 7807 // program is ill-formed. 7808 // C++0x [dcl.init]p11: 7809 // If no initializer is specified for an object, the object is 7810 // default-initialized; [...]. 7811 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 7812 InitializationKind Kind 7813 = InitializationKind::CreateDefault(Var->getLocation()); 7814 7815 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 7816 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, MultiExprArg()); 7817 if (Init.isInvalid()) 7818 Var->setInvalidDecl(); 7819 else if (Init.get()) { 7820 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 7821 // This is important for template substitution. 7822 Var->setInitStyle(VarDecl::CallInit); 7823 } 7824 7825 CheckCompleteVariableDeclaration(Var); 7826 } 7827 } 7828 7829 void Sema::ActOnCXXForRangeDecl(Decl *D) { 7830 VarDecl *VD = dyn_cast<VarDecl>(D); 7831 if (!VD) { 7832 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 7833 D->setInvalidDecl(); 7834 return; 7835 } 7836 7837 VD->setCXXForRangeDecl(true); 7838 7839 // for-range-declaration cannot be given a storage class specifier. 7840 int Error = -1; 7841 switch (VD->getStorageClassAsWritten()) { 7842 case SC_None: 7843 break; 7844 case SC_Extern: 7845 Error = 0; 7846 break; 7847 case SC_Static: 7848 Error = 1; 7849 break; 7850 case SC_PrivateExtern: 7851 Error = 2; 7852 break; 7853 case SC_Auto: 7854 Error = 3; 7855 break; 7856 case SC_Register: 7857 Error = 4; 7858 break; 7859 case SC_OpenCLWorkGroupLocal: 7860 llvm_unreachable("Unexpected storage class"); 7861 } 7862 if (VD->isConstexpr()) 7863 Error = 5; 7864 if (Error != -1) { 7865 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 7866 << VD->getDeclName() << Error; 7867 D->setInvalidDecl(); 7868 } 7869 } 7870 7871 void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 7872 if (var->isInvalidDecl()) return; 7873 7874 // In ARC, don't allow jumps past the implicit initialization of a 7875 // local retaining variable. 7876 if (getLangOpts().ObjCAutoRefCount && 7877 var->hasLocalStorage()) { 7878 switch (var->getType().getObjCLifetime()) { 7879 case Qualifiers::OCL_None: 7880 case Qualifiers::OCL_ExplicitNone: 7881 case Qualifiers::OCL_Autoreleasing: 7882 break; 7883 7884 case Qualifiers::OCL_Weak: 7885 case Qualifiers::OCL_Strong: 7886 getCurFunction()->setHasBranchProtectedScope(); 7887 break; 7888 } 7889 } 7890 7891 if (var->isThisDeclarationADefinition() && 7892 var->hasExternalLinkage() && 7893 getDiagnostics().getDiagnosticLevel( 7894 diag::warn_missing_variable_declarations, 7895 var->getLocation())) { 7896 // Find a previous declaration that's not a definition. 7897 VarDecl *prev = var->getPreviousDecl(); 7898 while (prev && prev->isThisDeclarationADefinition()) 7899 prev = prev->getPreviousDecl(); 7900 7901 if (!prev) 7902 Diag(var->getLocation(), diag::warn_missing_variable_declarations) << var; 7903 } 7904 7905 // All the following checks are C++ only. 7906 if (!getLangOpts().CPlusPlus) return; 7907 7908 QualType type = var->getType(); 7909 if (type->isDependentType()) return; 7910 7911 // __block variables might require us to capture a copy-initializer. 7912 if (var->hasAttr<BlocksAttr>()) { 7913 // It's currently invalid to ever have a __block variable with an 7914 // array type; should we diagnose that here? 7915 7916 // Regardless, we don't want to ignore array nesting when 7917 // constructing this copy. 7918 if (type->isStructureOrClassType()) { 7919 SourceLocation poi = var->getLocation(); 7920 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi); 7921 ExprResult result 7922 = PerformMoveOrCopyInitialization( 7923 InitializedEntity::InitializeBlock(poi, type, false), 7924 var, var->getType(), varRef, /*AllowNRVO=*/true); 7925 if (!result.isInvalid()) { 7926 result = MaybeCreateExprWithCleanups(result); 7927 Expr *init = result.takeAs<Expr>(); 7928 Context.setBlockVarCopyInits(var, init); 7929 } 7930 } 7931 } 7932 7933 Expr *Init = var->getInit(); 7934 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 7935 QualType baseType = Context.getBaseElementType(type); 7936 7937 if (!var->getDeclContext()->isDependentContext() && 7938 Init && !Init->isValueDependent()) { 7939 if (IsGlobal && !var->isConstexpr() && 7940 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 7941 var->getLocation()) 7942 != DiagnosticsEngine::Ignored && 7943 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 7944 Diag(var->getLocation(), diag::warn_global_constructor) 7945 << Init->getSourceRange(); 7946 7947 if (var->isConstexpr()) { 7948 SmallVector<PartialDiagnosticAt, 8> Notes; 7949 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 7950 SourceLocation DiagLoc = var->getLocation(); 7951 // If the note doesn't add any useful information other than a source 7952 // location, fold it into the primary diagnostic. 7953 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 7954 diag::note_invalid_subexpr_in_const_expr) { 7955 DiagLoc = Notes[0].first; 7956 Notes.clear(); 7957 } 7958 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 7959 << var << Init->getSourceRange(); 7960 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 7961 Diag(Notes[I].first, Notes[I].second); 7962 } 7963 } else if (var->isUsableInConstantExpressions(Context)) { 7964 // Check whether the initializer of a const variable of integral or 7965 // enumeration type is an ICE now, since we can't tell whether it was 7966 // initialized by a constant expression if we check later. 7967 var->checkInitIsICE(); 7968 } 7969 } 7970 7971 // Require the destructor. 7972 if (const RecordType *recordType = baseType->getAs<RecordType>()) 7973 FinalizeVarWithDestructor(var, recordType); 7974 } 7975 7976 /// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 7977 /// any semantic actions necessary after any initializer has been attached. 7978 void 7979 Sema::FinalizeDeclaration(Decl *ThisDecl) { 7980 // Note that we are no longer parsing the initializer for this declaration. 7981 ParsingInitForAutoVars.erase(ThisDecl); 7982 7983 VarDecl *VD = dyn_cast_or_null<VarDecl>(ThisDecl); 7984 if (!VD) 7985 return; 7986 7987 const DeclContext *DC = VD->getDeclContext(); 7988 // If there's a #pragma GCC visibility in scope, and this isn't a class 7989 // member, set the visibility of this variable. 7990 if (!DC->isRecord() && VD->hasExternalLinkage()) 7991 AddPushedVisibilityAttribute(VD); 7992 7993 if (VD->isFileVarDecl()) 7994 MarkUnusedFileScopedDecl(VD); 7995 7996 // Now we have parsed the initializer and can update the table of magic 7997 // tag values. 7998 if (!VD->hasAttr<TypeTagForDatatypeAttr>() || 7999 !VD->getType()->isIntegralOrEnumerationType()) 8000 return; 8001 8002 for (specific_attr_iterator<TypeTagForDatatypeAttr> 8003 I = ThisDecl->specific_attr_begin<TypeTagForDatatypeAttr>(), 8004 E = ThisDecl->specific_attr_end<TypeTagForDatatypeAttr>(); 8005 I != E; ++I) { 8006 const Expr *MagicValueExpr = VD->getInit(); 8007 if (!MagicValueExpr) { 8008 continue; 8009 } 8010 llvm::APSInt MagicValueInt; 8011 if (!MagicValueExpr->isIntegerConstantExpr(MagicValueInt, Context)) { 8012 Diag(I->getRange().getBegin(), 8013 diag::err_type_tag_for_datatype_not_ice) 8014 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange(); 8015 continue; 8016 } 8017 if (MagicValueInt.getActiveBits() > 64) { 8018 Diag(I->getRange().getBegin(), 8019 diag::err_type_tag_for_datatype_too_large) 8020 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange(); 8021 continue; 8022 } 8023 uint64_t MagicValue = MagicValueInt.getZExtValue(); 8024 RegisterTypeTagForDatatype(I->getArgumentKind(), 8025 MagicValue, 8026 I->getMatchingCType(), 8027 I->getLayoutCompatible(), 8028 I->getMustBeNull()); 8029 } 8030 } 8031 8032 Sema::DeclGroupPtrTy 8033 Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 8034 Decl **Group, unsigned NumDecls) { 8035 SmallVector<Decl*, 8> Decls; 8036 8037 if (DS.isTypeSpecOwned()) 8038 Decls.push_back(DS.getRepAsDecl()); 8039 8040 for (unsigned i = 0; i != NumDecls; ++i) 8041 if (Decl *D = Group[i]) 8042 Decls.push_back(D); 8043 8044 if (DeclSpec::isDeclRep(DS.getTypeSpecType())) 8045 if (const TagDecl *Tag = dyn_cast_or_null<TagDecl>(DS.getRepAsDecl())) 8046 getASTContext().addUnnamedTag(Tag); 8047 8048 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 8049 DS.getTypeSpecType() == DeclSpec::TST_auto); 8050 } 8051 8052 /// BuildDeclaratorGroup - convert a list of declarations into a declaration 8053 /// group, performing any necessary semantic checking. 8054 Sema::DeclGroupPtrTy 8055 Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 8056 bool TypeMayContainAuto) { 8057 // C++0x [dcl.spec.auto]p7: 8058 // If the type deduced for the template parameter U is not the same in each 8059 // deduction, the program is ill-formed. 8060 // FIXME: When initializer-list support is added, a distinction is needed 8061 // between the deduced type U and the deduced type which 'auto' stands for. 8062 // auto a = 0, b = { 1, 2, 3 }; 8063 // is legal because the deduced type U is 'int' in both cases. 8064 if (TypeMayContainAuto && NumDecls > 1) { 8065 QualType Deduced; 8066 CanQualType DeducedCanon; 8067 VarDecl *DeducedDecl = 0; 8068 for (unsigned i = 0; i != NumDecls; ++i) { 8069 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 8070 AutoType *AT = D->getType()->getContainedAutoType(); 8071 // Don't reissue diagnostics when instantiating a template. 8072 if (AT && D->isInvalidDecl()) 8073 break; 8074 if (AT && AT->isDeduced()) { 8075 QualType U = AT->getDeducedType(); 8076 CanQualType UCanon = Context.getCanonicalType(U); 8077 if (Deduced.isNull()) { 8078 Deduced = U; 8079 DeducedCanon = UCanon; 8080 DeducedDecl = D; 8081 } else if (DeducedCanon != UCanon) { 8082 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 8083 diag::err_auto_different_deductions) 8084 << Deduced << DeducedDecl->getDeclName() 8085 << U << D->getDeclName() 8086 << DeducedDecl->getInit()->getSourceRange() 8087 << D->getInit()->getSourceRange(); 8088 D->setInvalidDecl(); 8089 break; 8090 } 8091 } 8092 } 8093 } 8094 } 8095 8096 ActOnDocumentableDecls(Group, NumDecls); 8097 8098 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 8099 } 8100 8101 void Sema::ActOnDocumentableDecl(Decl *D) { 8102 ActOnDocumentableDecls(&D, 1); 8103 } 8104 8105 void Sema::ActOnDocumentableDecls(Decl **Group, unsigned NumDecls) { 8106 // Don't parse the comment if Doxygen diagnostics are ignored. 8107 if (NumDecls == 0 || !Group[0]) 8108 return; 8109 8110 if (Diags.getDiagnosticLevel(diag::warn_doc_param_not_found, 8111 Group[0]->getLocation()) 8112 == DiagnosticsEngine::Ignored) 8113 return; 8114 8115 if (NumDecls >= 2) { 8116 // This is a decl group. Normally it will contain only declarations 8117 // procuded from declarator list. But in case we have any definitions or 8118 // additional declaration references: 8119 // 'typedef struct S {} S;' 8120 // 'typedef struct S *S;' 8121 // 'struct S *pS;' 8122 // FinalizeDeclaratorGroup adds these as separate declarations. 8123 Decl *MaybeTagDecl = Group[0]; 8124 if (MaybeTagDecl && isa<TagDecl>(MaybeTagDecl)) { 8125 Group++; 8126 NumDecls--; 8127 } 8128 } 8129 8130 // See if there are any new comments that are not attached to a decl. 8131 ArrayRef<RawComment *> Comments = Context.getRawCommentList().getComments(); 8132 if (!Comments.empty() && 8133 !Comments.back()->isAttached()) { 8134 // There is at least one comment that not attached to a decl. 8135 // Maybe it should be attached to one of these decls? 8136 // 8137 // Note that this way we pick up not only comments that precede the 8138 // declaration, but also comments that *follow* the declaration -- thanks to 8139 // the lookahead in the lexer: we've consumed the semicolon and looked 8140 // ahead through comments. 8141 for (unsigned i = 0; i != NumDecls; ++i) 8142 Context.getCommentForDecl(Group[i], &PP); 8143 } 8144 } 8145 8146 /// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 8147 /// to introduce parameters into function prototype scope. 8148 Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 8149 const DeclSpec &DS = D.getDeclSpec(); 8150 8151 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 8152 // C++03 [dcl.stc]p2 also permits 'auto'. 8153 VarDecl::StorageClass StorageClass = SC_None; 8154 VarDecl::StorageClass StorageClassAsWritten = SC_None; 8155 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 8156 StorageClass = SC_Register; 8157 StorageClassAsWritten = SC_Register; 8158 } else if (getLangOpts().CPlusPlus && 8159 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 8160 StorageClass = SC_Auto; 8161 StorageClassAsWritten = SC_Auto; 8162 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 8163 Diag(DS.getStorageClassSpecLoc(), 8164 diag::err_invalid_storage_class_in_func_decl); 8165 D.getMutableDeclSpec().ClearStorageClassSpecs(); 8166 } 8167 8168 if (D.getDeclSpec().isThreadSpecified()) 8169 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8170 if (D.getDeclSpec().isConstexprSpecified()) 8171 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8172 << 0; 8173 8174 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 8175 8176 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8177 QualType parmDeclType = TInfo->getType(); 8178 8179 if (getLangOpts().CPlusPlus) { 8180 // Check that there are no default arguments inside the type of this 8181 // parameter. 8182 CheckExtraCXXDefaultArguments(D); 8183 8184 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 8185 if (D.getCXXScopeSpec().isSet()) { 8186 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 8187 << D.getCXXScopeSpec().getRange(); 8188 D.getCXXScopeSpec().clear(); 8189 } 8190 } 8191 8192 // Ensure we have a valid name 8193 IdentifierInfo *II = 0; 8194 if (D.hasName()) { 8195 II = D.getIdentifier(); 8196 if (!II) { 8197 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 8198 << GetNameForDeclarator(D).getName().getAsString(); 8199 D.setInvalidType(true); 8200 } 8201 } 8202 8203 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 8204 if (II) { 8205 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 8206 ForRedeclaration); 8207 LookupName(R, S); 8208 if (R.isSingleResult()) { 8209 NamedDecl *PrevDecl = R.getFoundDecl(); 8210 if (PrevDecl->isTemplateParameter()) { 8211 // Maybe we will complain about the shadowed template parameter. 8212 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8213 // Just pretend that we didn't see the previous declaration. 8214 PrevDecl = 0; 8215 } else if (S->isDeclScope(PrevDecl)) { 8216 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 8217 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8218 8219 // Recover by removing the name 8220 II = 0; 8221 D.SetIdentifier(0, D.getIdentifierLoc()); 8222 D.setInvalidType(true); 8223 } 8224 } 8225 } 8226 8227 // Temporarily put parameter variables in the translation unit, not 8228 // the enclosing context. This prevents them from accidentally 8229 // looking like class members in C++. 8230 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 8231 D.getLocStart(), 8232 D.getIdentifierLoc(), II, 8233 parmDeclType, TInfo, 8234 StorageClass, StorageClassAsWritten); 8235 8236 if (D.isInvalidType()) 8237 New->setInvalidDecl(); 8238 8239 assert(S->isFunctionPrototypeScope()); 8240 assert(S->getFunctionPrototypeDepth() >= 1); 8241 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 8242 S->getNextFunctionPrototypeIndex()); 8243 8244 // Add the parameter declaration into this scope. 8245 S->AddDecl(New); 8246 if (II) 8247 IdResolver.AddDecl(New); 8248 8249 ProcessDeclAttributes(S, New, D); 8250 8251 if (D.getDeclSpec().isModulePrivateSpecified()) 8252 Diag(New->getLocation(), diag::err_module_private_local) 8253 << 1 << New->getDeclName() 8254 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 8255 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 8256 8257 if (New->hasAttr<BlocksAttr>()) { 8258 Diag(New->getLocation(), diag::err_block_on_nonlocal); 8259 } 8260 return New; 8261 } 8262 8263 /// \brief Synthesizes a variable for a parameter arising from a 8264 /// typedef. 8265 ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 8266 SourceLocation Loc, 8267 QualType T) { 8268 /* FIXME: setting StartLoc == Loc. 8269 Would it be worth to modify callers so as to provide proper source 8270 location for the unnamed parameters, embedding the parameter's type? */ 8271 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 8272 T, Context.getTrivialTypeSourceInfo(T, Loc), 8273 SC_None, SC_None, 0); 8274 Param->setImplicit(); 8275 return Param; 8276 } 8277 8278 void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 8279 ParmVarDecl * const *ParamEnd) { 8280 // Don't diagnose unused-parameter errors in template instantiations; we 8281 // will already have done so in the template itself. 8282 if (!ActiveTemplateInstantiations.empty()) 8283 return; 8284 8285 for (; Param != ParamEnd; ++Param) { 8286 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 8287 !(*Param)->hasAttr<UnusedAttr>()) { 8288 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 8289 << (*Param)->getDeclName(); 8290 } 8291 } 8292 } 8293 8294 void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 8295 ParmVarDecl * const *ParamEnd, 8296 QualType ReturnTy, 8297 NamedDecl *D) { 8298 if (LangOpts.NumLargeByValueCopy == 0) // No check. 8299 return; 8300 8301 // Warn if the return value is pass-by-value and larger than the specified 8302 // threshold. 8303 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 8304 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 8305 if (Size > LangOpts.NumLargeByValueCopy) 8306 Diag(D->getLocation(), diag::warn_return_value_size) 8307 << D->getDeclName() << Size; 8308 } 8309 8310 // Warn if any parameter is pass-by-value and larger than the specified 8311 // threshold. 8312 for (; Param != ParamEnd; ++Param) { 8313 QualType T = (*Param)->getType(); 8314 if (T->isDependentType() || !T.isPODType(Context)) 8315 continue; 8316 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 8317 if (Size > LangOpts.NumLargeByValueCopy) 8318 Diag((*Param)->getLocation(), diag::warn_parameter_size) 8319 << (*Param)->getDeclName() << Size; 8320 } 8321 } 8322 8323 ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 8324 SourceLocation NameLoc, IdentifierInfo *Name, 8325 QualType T, TypeSourceInfo *TSInfo, 8326 VarDecl::StorageClass StorageClass, 8327 VarDecl::StorageClass StorageClassAsWritten) { 8328 // In ARC, infer a lifetime qualifier for appropriate parameter types. 8329 if (getLangOpts().ObjCAutoRefCount && 8330 T.getObjCLifetime() == Qualifiers::OCL_None && 8331 T->isObjCLifetimeType()) { 8332 8333 Qualifiers::ObjCLifetime lifetime; 8334 8335 // Special cases for arrays: 8336 // - if it's const, use __unsafe_unretained 8337 // - otherwise, it's an error 8338 if (T->isArrayType()) { 8339 if (!T.isConstQualified()) { 8340 DelayedDiagnostics.add( 8341 sema::DelayedDiagnostic::makeForbiddenType( 8342 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 8343 } 8344 lifetime = Qualifiers::OCL_ExplicitNone; 8345 } else { 8346 lifetime = T->getObjCARCImplicitLifetime(); 8347 } 8348 T = Context.getLifetimeQualifiedType(T, lifetime); 8349 } 8350 8351 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 8352 Context.getAdjustedParameterType(T), 8353 TSInfo, 8354 StorageClass, StorageClassAsWritten, 8355 0); 8356 8357 // Parameters can not be abstract class types. 8358 // For record types, this is done by the AbstractClassUsageDiagnoser once 8359 // the class has been completely parsed. 8360 if (!CurContext->isRecord() && 8361 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 8362 AbstractParamType)) 8363 New->setInvalidDecl(); 8364 8365 // Parameter declarators cannot be interface types. All ObjC objects are 8366 // passed by reference. 8367 if (T->isObjCObjectType()) { 8368 SourceLocation TypeEndLoc = TSInfo->getTypeLoc().getLocEnd(); 8369 Diag(NameLoc, 8370 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 8371 << FixItHint::CreateInsertion(TypeEndLoc, "*"); 8372 T = Context.getObjCObjectPointerType(T); 8373 New->setType(T); 8374 } 8375 8376 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 8377 // duration shall not be qualified by an address-space qualifier." 8378 // Since all parameters have automatic store duration, they can not have 8379 // an address space. 8380 if (T.getAddressSpace() != 0) { 8381 Diag(NameLoc, diag::err_arg_with_address_space); 8382 New->setInvalidDecl(); 8383 } 8384 8385 return New; 8386 } 8387 8388 void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 8389 SourceLocation LocAfterDecls) { 8390 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 8391 8392 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 8393 // for a K&R function. 8394 if (!FTI.hasPrototype) { 8395 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 8396 --i; 8397 if (FTI.ArgInfo[i].Param == 0) { 8398 SmallString<256> Code; 8399 llvm::raw_svector_ostream(Code) << " int " 8400 << FTI.ArgInfo[i].Ident->getName() 8401 << ";\n"; 8402 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 8403 << FTI.ArgInfo[i].Ident 8404 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 8405 8406 // Implicitly declare the argument as type 'int' for lack of a better 8407 // type. 8408 AttributeFactory attrs; 8409 DeclSpec DS(attrs); 8410 const char* PrevSpec; // unused 8411 unsigned DiagID; // unused 8412 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 8413 PrevSpec, DiagID); 8414 // Use the identifier location for the type source range. 8415 DS.SetRangeStart(FTI.ArgInfo[i].IdentLoc); 8416 DS.SetRangeEnd(FTI.ArgInfo[i].IdentLoc); 8417 Declarator ParamD(DS, Declarator::KNRTypeListContext); 8418 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 8419 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 8420 } 8421 } 8422 } 8423 } 8424 8425 Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 8426 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 8427 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 8428 Scope *ParentScope = FnBodyScope->getParent(); 8429 8430 D.setFunctionDefinitionKind(FDK_Definition); 8431 Decl *DP = HandleDeclarator(ParentScope, D, MultiTemplateParamsArg()); 8432 return ActOnStartOfFunctionDef(FnBodyScope, DP); 8433 } 8434 8435 static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD, 8436 const FunctionDecl*& PossibleZeroParamPrototype) { 8437 // Don't warn about invalid declarations. 8438 if (FD->isInvalidDecl()) 8439 return false; 8440 8441 // Or declarations that aren't global. 8442 if (!FD->isGlobal()) 8443 return false; 8444 8445 // Don't warn about C++ member functions. 8446 if (isa<CXXMethodDecl>(FD)) 8447 return false; 8448 8449 // Don't warn about 'main'. 8450 if (FD->isMain()) 8451 return false; 8452 8453 // Don't warn about inline functions. 8454 if (FD->isInlined()) 8455 return false; 8456 8457 // Don't warn about function templates. 8458 if (FD->getDescribedFunctionTemplate()) 8459 return false; 8460 8461 // Don't warn about function template specializations. 8462 if (FD->isFunctionTemplateSpecialization()) 8463 return false; 8464 8465 // Don't warn for OpenCL kernels. 8466 if (FD->hasAttr<OpenCLKernelAttr>()) 8467 return false; 8468 8469 bool MissingPrototype = true; 8470 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 8471 Prev; Prev = Prev->getPreviousDecl()) { 8472 // Ignore any declarations that occur in function or method 8473 // scope, because they aren't visible from the header. 8474 if (Prev->getDeclContext()->isFunctionOrMethod()) 8475 continue; 8476 8477 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 8478 if (FD->getNumParams() == 0) 8479 PossibleZeroParamPrototype = Prev; 8480 break; 8481 } 8482 8483 return MissingPrototype; 8484 } 8485 8486 void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 8487 // Don't complain if we're in GNU89 mode and the previous definition 8488 // was an extern inline function. 8489 const FunctionDecl *Definition; 8490 if (FD->isDefined(Definition) && 8491 !canRedefineFunction(Definition, getLangOpts())) { 8492 if (getLangOpts().GNUMode && Definition->isInlineSpecified() && 8493 Definition->getStorageClass() == SC_Extern) 8494 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 8495 << FD->getDeclName() << getLangOpts().CPlusPlus; 8496 else 8497 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 8498 Diag(Definition->getLocation(), diag::note_previous_definition); 8499 FD->setInvalidDecl(); 8500 } 8501 } 8502 8503 Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 8504 // Clear the last template instantiation error context. 8505 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 8506 8507 if (!D) 8508 return D; 8509 FunctionDecl *FD = 0; 8510 8511 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 8512 FD = FunTmpl->getTemplatedDecl(); 8513 else 8514 FD = cast<FunctionDecl>(D); 8515 8516 // Enter a new function scope 8517 PushFunctionScope(); 8518 8519 // See if this is a redefinition. 8520 if (!FD->isLateTemplateParsed()) 8521 CheckForFunctionRedefinition(FD); 8522 8523 // Builtin functions cannot be defined. 8524 if (unsigned BuiltinID = FD->getBuiltinID()) { 8525 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 8526 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 8527 FD->setInvalidDecl(); 8528 } 8529 } 8530 8531 // The return type of a function definition must be complete 8532 // (C99 6.9.1p3, C++ [dcl.fct]p6). 8533 QualType ResultType = FD->getResultType(); 8534 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 8535 !FD->isInvalidDecl() && 8536 RequireCompleteType(FD->getLocation(), ResultType, 8537 diag::err_func_def_incomplete_result)) 8538 FD->setInvalidDecl(); 8539 8540 // GNU warning -Wmissing-prototypes: 8541 // Warn if a global function is defined without a previous 8542 // prototype declaration. This warning is issued even if the 8543 // definition itself provides a prototype. The aim is to detect 8544 // global functions that fail to be declared in header files. 8545 const FunctionDecl *PossibleZeroParamPrototype = 0; 8546 if (ShouldWarnAboutMissingPrototype(FD, PossibleZeroParamPrototype)) { 8547 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 8548 8549 if (PossibleZeroParamPrototype) { 8550 // We found a declaration that is not a prototype, 8551 // but that could be a zero-parameter prototype 8552 TypeSourceInfo* TI = PossibleZeroParamPrototype->getTypeSourceInfo(); 8553 TypeLoc TL = TI->getTypeLoc(); 8554 if (FunctionNoProtoTypeLoc FTL = TL.getAs<FunctionNoProtoTypeLoc>()) 8555 Diag(PossibleZeroParamPrototype->getLocation(), 8556 diag::note_declaration_not_a_prototype) 8557 << PossibleZeroParamPrototype 8558 << FixItHint::CreateInsertion(FTL.getRParenLoc(), "void"); 8559 } 8560 } 8561 8562 if (FnBodyScope) 8563 PushDeclContext(FnBodyScope, FD); 8564 8565 // Check the validity of our function parameters 8566 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 8567 /*CheckParameterNames=*/true); 8568 8569 // Introduce our parameters into the function scope 8570 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 8571 ParmVarDecl *Param = FD->getParamDecl(p); 8572 Param->setOwningFunction(FD); 8573 8574 // If this has an identifier, add it to the scope stack. 8575 if (Param->getIdentifier() && FnBodyScope) { 8576 CheckShadow(FnBodyScope, Param); 8577 8578 PushOnScopeChains(Param, FnBodyScope); 8579 } 8580 } 8581 8582 // If we had any tags defined in the function prototype, 8583 // introduce them into the function scope. 8584 if (FnBodyScope) { 8585 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(), 8586 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) { 8587 NamedDecl *D = *I; 8588 8589 // Some of these decls (like enums) may have been pinned to the translation unit 8590 // for lack of a real context earlier. If so, remove from the translation unit 8591 // and reattach to the current context. 8592 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) { 8593 // Is the decl actually in the context? 8594 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(), 8595 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) { 8596 if (*DI == D) { 8597 Context.getTranslationUnitDecl()->removeDecl(D); 8598 break; 8599 } 8600 } 8601 // Either way, reassign the lexical decl context to our FunctionDecl. 8602 D->setLexicalDeclContext(CurContext); 8603 } 8604 8605 // If the decl has a non-null name, make accessible in the current scope. 8606 if (!D->getName().empty()) 8607 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false); 8608 8609 // Similarly, dive into enums and fish their constants out, making them 8610 // accessible in this scope. 8611 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) { 8612 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(), 8613 EE = ED->enumerator_end(); EI != EE; ++EI) 8614 PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false); 8615 } 8616 } 8617 } 8618 8619 // Ensure that the function's exception specification is instantiated. 8620 if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>()) 8621 ResolveExceptionSpec(D->getLocation(), FPT); 8622 8623 // Checking attributes of current function definition 8624 // dllimport attribute. 8625 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 8626 if (DA && (!FD->getAttr<DLLExportAttr>())) { 8627 // dllimport attribute cannot be directly applied to definition. 8628 // Microsoft accepts dllimport for functions defined within class scope. 8629 if (!DA->isInherited() && 8630 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 8631 Diag(FD->getLocation(), 8632 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 8633 << "dllimport"; 8634 FD->setInvalidDecl(); 8635 return D; 8636 } 8637 8638 // Visual C++ appears to not think this is an issue, so only issue 8639 // a warning when Microsoft extensions are disabled. 8640 if (!LangOpts.MicrosoftExt) { 8641 // If a symbol previously declared dllimport is later defined, the 8642 // attribute is ignored in subsequent references, and a warning is 8643 // emitted. 8644 Diag(FD->getLocation(), 8645 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 8646 << FD->getName() << "dllimport"; 8647 } 8648 } 8649 // We want to attach documentation to original Decl (which might be 8650 // a function template). 8651 ActOnDocumentableDecl(D); 8652 return D; 8653 } 8654 8655 /// \brief Given the set of return statements within a function body, 8656 /// compute the variables that are subject to the named return value 8657 /// optimization. 8658 /// 8659 /// Each of the variables that is subject to the named return value 8660 /// optimization will be marked as NRVO variables in the AST, and any 8661 /// return statement that has a marked NRVO variable as its NRVO candidate can 8662 /// use the named return value optimization. 8663 /// 8664 /// This function applies a very simplistic algorithm for NRVO: if every return 8665 /// statement in the function has the same NRVO candidate, that candidate is 8666 /// the NRVO variable. 8667 /// 8668 /// FIXME: Employ a smarter algorithm that accounts for multiple return 8669 /// statements and the lifetimes of the NRVO candidates. We should be able to 8670 /// find a maximal set of NRVO variables. 8671 void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 8672 ReturnStmt **Returns = Scope->Returns.data(); 8673 8674 const VarDecl *NRVOCandidate = 0; 8675 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 8676 if (!Returns[I]->getNRVOCandidate()) 8677 return; 8678 8679 if (!NRVOCandidate) 8680 NRVOCandidate = Returns[I]->getNRVOCandidate(); 8681 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 8682 return; 8683 } 8684 8685 if (NRVOCandidate) 8686 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 8687 } 8688 8689 bool Sema::canSkipFunctionBody(Decl *D) { 8690 if (!Consumer.shouldSkipFunctionBody(D)) 8691 return false; 8692 8693 if (isa<ObjCMethodDecl>(D)) 8694 return true; 8695 8696 FunctionDecl *FD = 0; 8697 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(D)) 8698 FD = FTD->getTemplatedDecl(); 8699 else 8700 FD = cast<FunctionDecl>(D); 8701 8702 // We cannot skip the body of a function (or function template) which is 8703 // constexpr, since we may need to evaluate its body in order to parse the 8704 // rest of the file. 8705 return !FD->isConstexpr(); 8706 } 8707 8708 Decl *Sema::ActOnSkippedFunctionBody(Decl *Decl) { 8709 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(Decl)) 8710 FD->setHasSkippedBody(); 8711 else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(Decl)) 8712 MD->setHasSkippedBody(); 8713 return ActOnFinishFunctionBody(Decl, 0); 8714 } 8715 8716 Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 8717 return ActOnFinishFunctionBody(D, BodyArg, false); 8718 } 8719 8720 Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 8721 bool IsInstantiation) { 8722 FunctionDecl *FD = 0; 8723 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 8724 if (FunTmpl) 8725 FD = FunTmpl->getTemplatedDecl(); 8726 else 8727 FD = dyn_cast_or_null<FunctionDecl>(dcl); 8728 8729 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 8730 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 8731 8732 if (FD) { 8733 FD->setBody(Body); 8734 8735 // The only way to be included in UndefinedButUsed is if there is an 8736 // ODR use before the definition. Avoid the expensive map lookup if this 8737 // is the first declaration. 8738 if (FD->getPreviousDecl() != 0 && FD->getPreviousDecl()->isUsed()) { 8739 if (FD->getLinkage() != ExternalLinkage) 8740 UndefinedButUsed.erase(FD); 8741 else if (FD->isInlined() && 8742 (LangOpts.CPlusPlus || !LangOpts.GNUInline) && 8743 (!FD->getPreviousDecl()->hasAttr<GNUInlineAttr>())) 8744 UndefinedButUsed.erase(FD); 8745 } 8746 8747 // If the function implicitly returns zero (like 'main') or is naked, 8748 // don't complain about missing return statements. 8749 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) 8750 WP.disableCheckFallThrough(); 8751 8752 // MSVC permits the use of pure specifier (=0) on function definition, 8753 // defined at class scope, warn about this non standard construct. 8754 if (getLangOpts().MicrosoftExt && FD->isPure()) 8755 Diag(FD->getLocation(), diag::warn_pure_function_definition); 8756 8757 if (!FD->isInvalidDecl()) { 8758 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 8759 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 8760 FD->getResultType(), FD); 8761 8762 // If this is a constructor, we need a vtable. 8763 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 8764 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 8765 8766 // Try to apply the named return value optimization. We have to check 8767 // if we can do this here because lambdas keep return statements around 8768 // to deduce an implicit return type. 8769 if (getLangOpts().CPlusPlus && FD->getResultType()->isRecordType() && 8770 !FD->isDependentContext()) 8771 computeNRVO(Body, getCurFunction()); 8772 } 8773 8774 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 8775 "Function parsing confused"); 8776 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 8777 assert(MD == getCurMethodDecl() && "Method parsing confused"); 8778 MD->setBody(Body); 8779 if (!MD->isInvalidDecl()) { 8780 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 8781 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 8782 MD->getResultType(), MD); 8783 8784 if (Body) 8785 computeNRVO(Body, getCurFunction()); 8786 } 8787 if (getCurFunction()->ObjCShouldCallSuper) { 8788 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_call) 8789 << MD->getSelector().getAsString(); 8790 getCurFunction()->ObjCShouldCallSuper = false; 8791 } 8792 } else { 8793 return 0; 8794 } 8795 8796 assert(!getCurFunction()->ObjCShouldCallSuper && 8797 "This should only be set for ObjC methods, which should have been " 8798 "handled in the block above."); 8799 8800 // Verify and clean out per-function state. 8801 if (Body) { 8802 // C++ constructors that have function-try-blocks can't have return 8803 // statements in the handlers of that block. (C++ [except.handle]p14) 8804 // Verify this. 8805 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 8806 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 8807 8808 // Verify that gotos and switch cases don't jump into scopes illegally. 8809 if (getCurFunction()->NeedsScopeChecking() && 8810 !dcl->isInvalidDecl() && 8811 !hasAnyUnrecoverableErrorsInThisFunction() && 8812 !PP.isCodeCompletionEnabled()) 8813 DiagnoseInvalidJumps(Body); 8814 8815 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 8816 if (!Destructor->getParent()->isDependentType()) 8817 CheckDestructor(Destructor); 8818 8819 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 8820 Destructor->getParent()); 8821 } 8822 8823 // If any errors have occurred, clear out any temporaries that may have 8824 // been leftover. This ensures that these temporaries won't be picked up for 8825 // deletion in some later function. 8826 if (PP.getDiagnostics().hasErrorOccurred() || 8827 PP.getDiagnostics().getSuppressAllDiagnostics()) { 8828 DiscardCleanupsInEvaluationContext(); 8829 } 8830 if (!PP.getDiagnostics().hasUncompilableErrorOccurred() && 8831 !isa<FunctionTemplateDecl>(dcl)) { 8832 // Since the body is valid, issue any analysis-based warnings that are 8833 // enabled. 8834 ActivePolicy = &WP; 8835 } 8836 8837 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && 8838 (!CheckConstexprFunctionDecl(FD) || 8839 !CheckConstexprFunctionBody(FD, Body))) 8840 FD->setInvalidDecl(); 8841 8842 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 8843 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 8844 assert(MaybeODRUseExprs.empty() && 8845 "Leftover expressions for odr-use checking"); 8846 } 8847 8848 if (!IsInstantiation) 8849 PopDeclContext(); 8850 8851 PopFunctionScopeInfo(ActivePolicy, dcl); 8852 8853 // If any errors have occurred, clear out any temporaries that may have 8854 // been leftover. This ensures that these temporaries won't be picked up for 8855 // deletion in some later function. 8856 if (getDiagnostics().hasErrorOccurred()) { 8857 DiscardCleanupsInEvaluationContext(); 8858 } 8859 8860 return dcl; 8861 } 8862 8863 8864 /// When we finish delayed parsing of an attribute, we must attach it to the 8865 /// relevant Decl. 8866 void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 8867 ParsedAttributes &Attrs) { 8868 // Always attach attributes to the underlying decl. 8869 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 8870 D = TD->getTemplatedDecl(); 8871 ProcessDeclAttributeList(S, D, Attrs.getList()); 8872 8873 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D)) 8874 if (Method->isStatic()) 8875 checkThisInStaticMemberFunctionAttributes(Method); 8876 } 8877 8878 8879 /// ImplicitlyDefineFunction - An undeclared identifier was used in a function 8880 /// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 8881 NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 8882 IdentifierInfo &II, Scope *S) { 8883 // Before we produce a declaration for an implicitly defined 8884 // function, see whether there was a locally-scoped declaration of 8885 // this name as a function or variable. If so, use that 8886 // (non-visible) declaration, and complain about it. 8887 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 8888 = findLocallyScopedExternCDecl(&II); 8889 if (Pos != LocallyScopedExternCDecls.end()) { 8890 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 8891 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 8892 return Pos->second; 8893 } 8894 8895 // Extension in C99. Legal in C90, but warn about it. 8896 unsigned diag_id; 8897 if (II.getName().startswith("__builtin_")) 8898 diag_id = diag::warn_builtin_unknown; 8899 else if (getLangOpts().C99) 8900 diag_id = diag::ext_implicit_function_decl; 8901 else 8902 diag_id = diag::warn_implicit_function_decl; 8903 Diag(Loc, diag_id) << &II; 8904 8905 // Because typo correction is expensive, only do it if the implicit 8906 // function declaration is going to be treated as an error. 8907 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 8908 TypoCorrection Corrected; 8909 DeclFilterCCC<FunctionDecl> Validator; 8910 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 8911 LookupOrdinaryName, S, 0, Validator))) { 8912 std::string CorrectedStr = Corrected.getAsString(getLangOpts()); 8913 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts()); 8914 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 8915 8916 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 8917 << FixItHint::CreateReplacement(Loc, CorrectedStr); 8918 8919 if (Func->getLocation().isValid() 8920 && !II.getName().startswith("__builtin_")) 8921 Diag(Func->getLocation(), diag::note_previous_decl) 8922 << CorrectedQuotedStr; 8923 } 8924 } 8925 8926 // Set a Declarator for the implicit definition: int foo(); 8927 const char *Dummy; 8928 AttributeFactory attrFactory; 8929 DeclSpec DS(attrFactory); 8930 unsigned DiagID; 8931 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 8932 (void)Error; // Silence warning. 8933 assert(!Error && "Error setting up implicit decl!"); 8934 SourceLocation NoLoc; 8935 Declarator D(DS, Declarator::BlockContext); 8936 D.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/false, 8937 /*IsAmbiguous=*/false, 8938 /*RParenLoc=*/NoLoc, 8939 /*ArgInfo=*/0, 8940 /*NumArgs=*/0, 8941 /*EllipsisLoc=*/NoLoc, 8942 /*RParenLoc=*/NoLoc, 8943 /*TypeQuals=*/0, 8944 /*RefQualifierIsLvalueRef=*/true, 8945 /*RefQualifierLoc=*/NoLoc, 8946 /*ConstQualifierLoc=*/NoLoc, 8947 /*VolatileQualifierLoc=*/NoLoc, 8948 /*MutableLoc=*/NoLoc, 8949 EST_None, 8950 /*ESpecLoc=*/NoLoc, 8951 /*Exceptions=*/0, 8952 /*ExceptionRanges=*/0, 8953 /*NumExceptions=*/0, 8954 /*NoexceptExpr=*/0, 8955 Loc, Loc, D), 8956 DS.getAttributes(), 8957 SourceLocation()); 8958 D.SetIdentifier(&II, Loc); 8959 8960 // Insert this function into translation-unit scope. 8961 8962 DeclContext *PrevDC = CurContext; 8963 CurContext = Context.getTranslationUnitDecl(); 8964 8965 FunctionDecl *FD = cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 8966 FD->setImplicit(); 8967 8968 CurContext = PrevDC; 8969 8970 AddKnownFunctionAttributes(FD); 8971 8972 return FD; 8973 } 8974 8975 /// \brief Adds any function attributes that we know a priori based on 8976 /// the declaration of this function. 8977 /// 8978 /// These attributes can apply both to implicitly-declared builtins 8979 /// (like __builtin___printf_chk) or to library-declared functions 8980 /// like NSLog or printf. 8981 /// 8982 /// We need to check for duplicate attributes both here and where user-written 8983 /// attributes are applied to declarations. 8984 void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 8985 if (FD->isInvalidDecl()) 8986 return; 8987 8988 // If this is a built-in function, map its builtin attributes to 8989 // actual attributes. 8990 if (unsigned BuiltinID = FD->getBuiltinID()) { 8991 // Handle printf-formatting attributes. 8992 unsigned FormatIdx; 8993 bool HasVAListArg; 8994 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 8995 if (!FD->getAttr<FormatAttr>()) { 8996 const char *fmt = "printf"; 8997 unsigned int NumParams = FD->getNumParams(); 8998 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 8999 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 9000 fmt = "NSString"; 9001 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 9002 fmt, FormatIdx+1, 9003 HasVAListArg ? 0 : FormatIdx+2)); 9004 } 9005 } 9006 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 9007 HasVAListArg)) { 9008 if (!FD->getAttr<FormatAttr>()) 9009 FD->addAttr(::new (Context)