SemaDecl.cpp revision c4a839101e883261d038a1d5ea718dd46abd1d2d
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 "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/ASTConsumer.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/CommentDiagnostic.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/EvaluatedExprVisitor.h" 29#include "clang/AST/ExprCXX.h" 30#include "clang/AST/StmtCXX.h" 31#include "clang/AST/CharUnits.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Parse/ParseDiagnostic.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Sema/DelayedDiagnostic.h" 37#include "clang/Basic/SourceManager.h" 38#include "clang/Basic/TargetInfo.h" 39// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 40#include "clang/Lex/Preprocessor.h" 41#include "clang/Lex/HeaderSearch.h" 42#include "clang/Lex/ModuleLoader.h" 43#include "llvm/ADT/SmallString.h" 44#include "llvm/ADT/Triple.h" 45#include <algorithm> 46#include <cstring> 47#include <functional> 48using namespace clang; 49using namespace sema; 50 51Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 52 if (OwnedType) { 53 Decl *Group[2] = { OwnedType, Ptr }; 54 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 55 } 56 57 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 58} 59 60namespace { 61 62class TypeNameValidatorCCC : public CorrectionCandidateCallback { 63 public: 64 TypeNameValidatorCCC(bool AllowInvalid, bool WantClass=false) 65 : AllowInvalidDecl(AllowInvalid), WantClassName(WantClass) { 66 WantExpressionKeywords = false; 67 WantCXXNamedCasts = false; 68 WantRemainingKeywords = false; 69 } 70 71 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 72 if (NamedDecl *ND = candidate.getCorrectionDecl()) 73 return (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) && 74 (AllowInvalidDecl || !ND->isInvalidDecl()); 75 else 76 return !WantClassName && candidate.isKeyword(); 77 } 78 79 private: 80 bool AllowInvalidDecl; 81 bool WantClassName; 82}; 83 84} 85 86/// \brief Determine whether the token kind starts a simple-type-specifier. 87bool Sema::isSimpleTypeSpecifier(tok::TokenKind Kind) const { 88 switch (Kind) { 89 // FIXME: Take into account the current language when deciding whether a 90 // token kind is a valid type specifier 91 case tok::kw_short: 92 case tok::kw_long: 93 case tok::kw___int64: 94 case tok::kw___int128: 95 case tok::kw_signed: 96 case tok::kw_unsigned: 97 case tok::kw_void: 98 case tok::kw_char: 99 case tok::kw_int: 100 case tok::kw_half: 101 case tok::kw_float: 102 case tok::kw_double: 103 case tok::kw_wchar_t: 104 case tok::kw_bool: 105 case tok::kw___underlying_type: 106 return true; 107 108 case tok::annot_typename: 109 case tok::kw_char16_t: 110 case tok::kw_char32_t: 111 case tok::kw_typeof: 112 case tok::kw_decltype: 113 return getLangOpts().CPlusPlus; 114 115 default: 116 break; 117 } 118 119 return false; 120} 121 122/// \brief If the identifier refers to a type name within this scope, 123/// return the declaration of that type. 124/// 125/// This routine performs ordinary name lookup of the identifier II 126/// within the given scope, with optional C++ scope specifier SS, to 127/// determine whether the name refers to a type. If so, returns an 128/// opaque pointer (actually a QualType) corresponding to that 129/// type. Otherwise, returns NULL. 130/// 131/// If name lookup results in an ambiguity, this routine will complain 132/// and then return NULL. 133ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 134 Scope *S, CXXScopeSpec *SS, 135 bool isClassName, bool HasTrailingDot, 136 ParsedType ObjectTypePtr, 137 bool IsCtorOrDtorName, 138 bool WantNontrivialTypeSourceInfo, 139 IdentifierInfo **CorrectedII) { 140 // Determine where we will perform name lookup. 141 DeclContext *LookupCtx = 0; 142 if (ObjectTypePtr) { 143 QualType ObjectType = ObjectTypePtr.get(); 144 if (ObjectType->isRecordType()) 145 LookupCtx = computeDeclContext(ObjectType); 146 } else if (SS && SS->isNotEmpty()) { 147 LookupCtx = computeDeclContext(*SS, false); 148 149 if (!LookupCtx) { 150 if (isDependentScopeSpecifier(*SS)) { 151 // C++ [temp.res]p3: 152 // A qualified-id that refers to a type and in which the 153 // nested-name-specifier depends on a template-parameter (14.6.2) 154 // shall be prefixed by the keyword typename to indicate that the 155 // qualified-id denotes a type, forming an 156 // elaborated-type-specifier (7.1.5.3). 157 // 158 // We therefore do not perform any name lookup if the result would 159 // refer to a member of an unknown specialization. 160 if (!isClassName && !IsCtorOrDtorName) 161 return ParsedType(); 162 163 // We know from the grammar that this name refers to a type, 164 // so build a dependent node to describe the type. 165 if (WantNontrivialTypeSourceInfo) 166 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 167 168 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 169 QualType T = 170 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 171 II, NameLoc); 172 173 return ParsedType::make(T); 174 } 175 176 return ParsedType(); 177 } 178 179 if (!LookupCtx->isDependentContext() && 180 RequireCompleteDeclContext(*SS, LookupCtx)) 181 return ParsedType(); 182 } 183 184 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 185 // lookup for class-names. 186 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 187 LookupOrdinaryName; 188 LookupResult Result(*this, &II, NameLoc, Kind); 189 if (LookupCtx) { 190 // Perform "qualified" name lookup into the declaration context we 191 // computed, which is either the type of the base of a member access 192 // expression or the declaration context associated with a prior 193 // nested-name-specifier. 194 LookupQualifiedName(Result, LookupCtx); 195 196 if (ObjectTypePtr && Result.empty()) { 197 // C++ [basic.lookup.classref]p3: 198 // If the unqualified-id is ~type-name, the type-name is looked up 199 // in the context of the entire postfix-expression. If the type T of 200 // the object expression is of a class type C, the type-name is also 201 // looked up in the scope of class C. At least one of the lookups shall 202 // find a name that refers to (possibly cv-qualified) T. 203 LookupName(Result, S); 204 } 205 } else { 206 // Perform unqualified name lookup. 207 LookupName(Result, S); 208 } 209 210 NamedDecl *IIDecl = 0; 211 switch (Result.getResultKind()) { 212 case LookupResult::NotFound: 213 case LookupResult::NotFoundInCurrentInstantiation: 214 if (CorrectedII) { 215 TypeNameValidatorCCC Validator(true, isClassName); 216 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 217 Kind, S, SS, Validator); 218 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 219 TemplateTy Template; 220 bool MemberOfUnknownSpecialization; 221 UnqualifiedId TemplateName; 222 TemplateName.setIdentifier(NewII, NameLoc); 223 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 224 CXXScopeSpec NewSS, *NewSSPtr = SS; 225 if (SS && NNS) { 226 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 227 NewSSPtr = &NewSS; 228 } 229 if (Correction && (NNS || NewII != &II) && 230 // Ignore a correction to a template type as the to-be-corrected 231 // identifier is not a template (typo correction for template names 232 // is handled elsewhere). 233 !(getLangOpts().CPlusPlus && NewSSPtr && 234 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 235 false, Template, MemberOfUnknownSpecialization))) { 236 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 237 isClassName, HasTrailingDot, ObjectTypePtr, 238 IsCtorOrDtorName, 239 WantNontrivialTypeSourceInfo); 240 if (Ty) { 241 std::string CorrectedStr(Correction.getAsString(getLangOpts())); 242 std::string CorrectedQuotedStr( 243 Correction.getQuoted(getLangOpts())); 244 Diag(NameLoc, diag::err_unknown_type_or_class_name_suggest) 245 << Result.getLookupName() << CorrectedQuotedStr << isClassName 246 << FixItHint::CreateReplacement(SourceRange(NameLoc), 247 CorrectedStr); 248 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 249 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 250 << CorrectedQuotedStr; 251 252 if (SS && NNS) 253 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 254 *CorrectedII = NewII; 255 return Ty; 256 } 257 } 258 } 259 // If typo correction failed or was not performed, fall through 260 case LookupResult::FoundOverloaded: 261 case LookupResult::FoundUnresolvedValue: 262 Result.suppressDiagnostics(); 263 return ParsedType(); 264 265 case LookupResult::Ambiguous: 266 // Recover from type-hiding ambiguities by hiding the type. We'll 267 // do the lookup again when looking for an object, and we can 268 // diagnose the error then. If we don't do this, then the error 269 // about hiding the type will be immediately followed by an error 270 // that only makes sense if the identifier was treated like a type. 271 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 272 Result.suppressDiagnostics(); 273 return ParsedType(); 274 } 275 276 // Look to see if we have a type anywhere in the list of results. 277 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 278 Res != ResEnd; ++Res) { 279 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 280 if (!IIDecl || 281 (*Res)->getLocation().getRawEncoding() < 282 IIDecl->getLocation().getRawEncoding()) 283 IIDecl = *Res; 284 } 285 } 286 287 if (!IIDecl) { 288 // None of the entities we found is a type, so there is no way 289 // to even assume that the result is a type. In this case, don't 290 // complain about the ambiguity. The parser will either try to 291 // perform this lookup again (e.g., as an object name), which 292 // will produce the ambiguity, or will complain that it expected 293 // a type name. 294 Result.suppressDiagnostics(); 295 return ParsedType(); 296 } 297 298 // We found a type within the ambiguous lookup; diagnose the 299 // ambiguity and then return that type. This might be the right 300 // answer, or it might not be, but it suppresses any attempt to 301 // perform the name lookup again. 302 break; 303 304 case LookupResult::Found: 305 IIDecl = Result.getFoundDecl(); 306 break; 307 } 308 309 assert(IIDecl && "Didn't find decl"); 310 311 QualType T; 312 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 313 DiagnoseUseOfDecl(IIDecl, NameLoc); 314 315 if (T.isNull()) 316 T = Context.getTypeDeclType(TD); 317 318 // NOTE: avoid constructing an ElaboratedType(Loc) if this is a 319 // constructor or destructor name (in such a case, the scope specifier 320 // will be attached to the enclosing Expr or Decl node). 321 if (SS && SS->isNotEmpty() && !IsCtorOrDtorName) { 322 if (WantNontrivialTypeSourceInfo) { 323 // Construct a type with type-source information. 324 TypeLocBuilder Builder; 325 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 326 327 T = getElaboratedType(ETK_None, *SS, T); 328 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 329 ElabTL.setElaboratedKeywordLoc(SourceLocation()); 330 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 331 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 332 } else { 333 T = getElaboratedType(ETK_None, *SS, T); 334 } 335 } 336 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 337 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 338 if (!HasTrailingDot) 339 T = Context.getObjCInterfaceType(IDecl); 340 } 341 342 if (T.isNull()) { 343 // If it's not plausibly a type, suppress diagnostics. 344 Result.suppressDiagnostics(); 345 return ParsedType(); 346 } 347 return ParsedType::make(T); 348} 349 350/// isTagName() - This method is called *for error recovery purposes only* 351/// to determine if the specified name is a valid tag name ("struct foo"). If 352/// so, this returns the TST for the tag corresponding to it (TST_enum, 353/// TST_union, TST_struct, TST_interface, TST_class). This is used to diagnose 354/// cases in C where the user forgot to specify the tag. 355DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 356 // Do a tag name lookup in this scope. 357 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 358 LookupName(R, S, false); 359 R.suppressDiagnostics(); 360 if (R.getResultKind() == LookupResult::Found) 361 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 362 switch (TD->getTagKind()) { 363 case TTK_Struct: return DeclSpec::TST_struct; 364 case TTK_Interface: return DeclSpec::TST_interface; 365 case TTK_Union: return DeclSpec::TST_union; 366 case TTK_Class: return DeclSpec::TST_class; 367 case TTK_Enum: return DeclSpec::TST_enum; 368 } 369 } 370 371 return DeclSpec::TST_unspecified; 372} 373 374/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 375/// if a CXXScopeSpec's type is equal to the type of one of the base classes 376/// then downgrade the missing typename error to a warning. 377/// This is needed for MSVC compatibility; Example: 378/// @code 379/// template<class T> class A { 380/// public: 381/// typedef int TYPE; 382/// }; 383/// template<class T> class B : public A<T> { 384/// public: 385/// A<T>::TYPE a; // no typename required because A<T> is a base class. 386/// }; 387/// @endcode 388bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 389 if (CurContext->isRecord()) { 390 const Type *Ty = SS->getScopeRep()->getAsType(); 391 392 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 393 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 394 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 395 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 396 return true; 397 return S->isFunctionPrototypeScope(); 398 } 399 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 400} 401 402bool Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II, 403 SourceLocation IILoc, 404 Scope *S, 405 CXXScopeSpec *SS, 406 ParsedType &SuggestedType) { 407 // We don't have anything to suggest (yet). 408 SuggestedType = ParsedType(); 409 410 // There may have been a typo in the name of the type. Look up typo 411 // results, in case we have something that we can suggest. 412 TypeNameValidatorCCC Validator(false); 413 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(II, IILoc), 414 LookupOrdinaryName, S, SS, 415 Validator)) { 416 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 417 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 418 419 if (Corrected.isKeyword()) { 420 // We corrected to a keyword. 421 IdentifierInfo *NewII = Corrected.getCorrectionAsIdentifierInfo(); 422 if (!isSimpleTypeSpecifier(NewII->getTokenID())) 423 CorrectedQuotedStr = "the keyword " + CorrectedQuotedStr; 424 Diag(IILoc, diag::err_unknown_typename_suggest) 425 << II << CorrectedQuotedStr 426 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 427 II = NewII; 428 } else { 429 NamedDecl *Result = Corrected.getCorrectionDecl(); 430 // We found a similarly-named type or interface; suggest that. 431 if (!SS || !SS->isSet()) 432 Diag(IILoc, diag::err_unknown_typename_suggest) 433 << II << CorrectedQuotedStr 434 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 435 else if (DeclContext *DC = computeDeclContext(*SS, false)) 436 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 437 << II << DC << CorrectedQuotedStr << SS->getRange() 438 << FixItHint::CreateReplacement(SourceRange(IILoc), 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 502static 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 517static 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. 572static 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 586Sema::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 618Corrected: 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 688 Diag(NameLoc, QualifiedDiag) 689 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 690 << SS.getRange() 691 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 692 693 // Update the name, so that the caller has the new name. 694 Name = Corrected.getCorrectionAsIdentifierInfo(); 695 696 // Typo correction corrected to a keyword. 697 if (Corrected.isKeyword()) 698 return Corrected.getCorrectionAsIdentifierInfo(); 699 700 // Also update the LookupResult... 701 // FIXME: This should probably go away at some point 702 Result.clear(); 703 Result.setLookupName(Corrected.getCorrection()); 704 if (FirstDecl) { 705 Result.addDecl(FirstDecl); 706 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 707 << CorrectedQuotedStr; 708 } 709 710 // If we found an Objective-C instance variable, let 711 // LookupInObjCMethod build the appropriate expression to 712 // reference the ivar. 713 // FIXME: This is a gross hack. 714 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 715 Result.clear(); 716 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 717 return E; 718 } 719 720 goto Corrected; 721 } 722 } 723 724 // We failed to correct; just fall through and let the parser deal with it. 725 Result.suppressDiagnostics(); 726 return NameClassification::Unknown(); 727 728 case LookupResult::NotFoundInCurrentInstantiation: { 729 // We performed name lookup into the current instantiation, and there were 730 // dependent bases, so we treat this result the same way as any other 731 // dependent nested-name-specifier. 732 733 // C++ [temp.res]p2: 734 // A name used in a template declaration or definition and that is 735 // dependent on a template-parameter is assumed not to name a type 736 // unless the applicable name lookup finds a type name or the name is 737 // qualified by the keyword typename. 738 // 739 // FIXME: If the next token is '<', we might want to ask the parser to 740 // perform some heroics to see if we actually have a 741 // template-argument-list, which would indicate a missing 'template' 742 // keyword here. 743 return ActOnDependentIdExpression(SS, /*TemplateKWLoc=*/SourceLocation(), 744 NameInfo, IsAddressOfOperand, 745 /*TemplateArgs=*/0); 746 } 747 748 case LookupResult::Found: 749 case LookupResult::FoundOverloaded: 750 case LookupResult::FoundUnresolvedValue: 751 break; 752 753 case LookupResult::Ambiguous: 754 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 755 hasAnyAcceptableTemplateNames(Result)) { 756 // C++ [temp.local]p3: 757 // A lookup that finds an injected-class-name (10.2) can result in an 758 // ambiguity in certain cases (for example, if it is found in more than 759 // one base class). If all of the injected-class-names that are found 760 // refer to specializations of the same class template, and if the name 761 // is followed by a template-argument-list, the reference refers to the 762 // class template itself and not a specialization thereof, and is not 763 // ambiguous. 764 // 765 // This filtering can make an ambiguous result into an unambiguous one, 766 // so try again after filtering out template names. 767 FilterAcceptableTemplateNames(Result); 768 if (!Result.isAmbiguous()) { 769 IsFilteredTemplateName = true; 770 break; 771 } 772 } 773 774 // Diagnose the ambiguity and return an error. 775 return NameClassification::Error(); 776 } 777 778 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 779 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 780 // C++ [temp.names]p3: 781 // After name lookup (3.4) finds that a name is a template-name or that 782 // an operator-function-id or a literal- operator-id refers to a set of 783 // overloaded functions any member of which is a function template if 784 // this is followed by a <, the < is always taken as the delimiter of a 785 // template-argument-list and never as the less-than operator. 786 if (!IsFilteredTemplateName) 787 FilterAcceptableTemplateNames(Result); 788 789 if (!Result.empty()) { 790 bool IsFunctionTemplate; 791 TemplateName Template; 792 if (Result.end() - Result.begin() > 1) { 793 IsFunctionTemplate = true; 794 Template = Context.getOverloadedTemplateName(Result.begin(), 795 Result.end()); 796 } else { 797 TemplateDecl *TD 798 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 799 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 800 801 if (SS.isSet() && !SS.isInvalid()) 802 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 803 /*TemplateKeyword=*/false, 804 TD); 805 else 806 Template = TemplateName(TD); 807 } 808 809 if (IsFunctionTemplate) { 810 // Function templates always go through overload resolution, at which 811 // point we'll perform the various checks (e.g., accessibility) we need 812 // to based on which function we selected. 813 Result.suppressDiagnostics(); 814 815 return NameClassification::FunctionTemplate(Template); 816 } 817 818 return NameClassification::TypeTemplate(Template); 819 } 820 } 821 822 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 823 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 824 DiagnoseUseOfDecl(Type, NameLoc); 825 QualType T = Context.getTypeDeclType(Type); 826 if (SS.isNotEmpty()) 827 return buildNestedType(*this, SS, T, NameLoc); 828 return ParsedType::make(T); 829 } 830 831 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 832 if (!Class) { 833 // FIXME: It's unfortunate that we don't have a Type node for handling this. 834 if (ObjCCompatibleAliasDecl *Alias 835 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 836 Class = Alias->getClassInterface(); 837 } 838 839 if (Class) { 840 DiagnoseUseOfDecl(Class, NameLoc); 841 842 if (NextToken.is(tok::period)) { 843 // Interface. <something> is parsed as a property reference expression. 844 // Just return "unknown" as a fall-through for now. 845 Result.suppressDiagnostics(); 846 return NameClassification::Unknown(); 847 } 848 849 QualType T = Context.getObjCInterfaceType(Class); 850 return ParsedType::make(T); 851 } 852 853 // We can have a type template here if we're classifying a template argument. 854 if (isa<TemplateDecl>(FirstDecl) && !isa<FunctionTemplateDecl>(FirstDecl)) 855 return NameClassification::TypeTemplate( 856 TemplateName(cast<TemplateDecl>(FirstDecl))); 857 858 // Check for a tag type hidden by a non-type decl in a few cases where it 859 // seems likely a type is wanted instead of the non-type that was found. 860 if (!getLangOpts().ObjC1) { 861 bool NextIsOp = NextToken.is(tok::amp) || NextToken.is(tok::star); 862 if ((NextToken.is(tok::identifier) || 863 (NextIsOp && FirstDecl->isFunctionOrFunctionTemplate())) && 864 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) { 865 TypeDecl *Type = Result.getAsSingle<TypeDecl>(); 866 DiagnoseUseOfDecl(Type, NameLoc); 867 QualType T = Context.getTypeDeclType(Type); 868 if (SS.isNotEmpty()) 869 return buildNestedType(*this, SS, T, NameLoc); 870 return ParsedType::make(T); 871 } 872 } 873 874 if (FirstDecl->isCXXClassMember()) 875 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0); 876 877 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 878 return BuildDeclarationNameExpr(SS, Result, ADL); 879} 880 881// Determines the context to return to after temporarily entering a 882// context. This depends in an unnecessarily complicated way on the 883// exact ordering of callbacks from the parser. 884DeclContext *Sema::getContainingDC(DeclContext *DC) { 885 886 // Functions defined inline within classes aren't parsed until we've 887 // finished parsing the top-level class, so the top-level class is 888 // the context we'll need to return to. 889 if (isa<FunctionDecl>(DC)) { 890 DC = DC->getLexicalParent(); 891 892 // A function not defined within a class will always return to its 893 // lexical context. 894 if (!isa<CXXRecordDecl>(DC)) 895 return DC; 896 897 // A C++ inline method/friend is parsed *after* the topmost class 898 // it was declared in is fully parsed ("complete"); the topmost 899 // class is the context we need to return to. 900 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 901 DC = RD; 902 903 // Return the declaration context of the topmost class the inline method is 904 // declared in. 905 return DC; 906 } 907 908 return DC->getLexicalParent(); 909} 910 911void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 912 assert(getContainingDC(DC) == CurContext && 913 "The next DeclContext should be lexically contained in the current one."); 914 CurContext = DC; 915 S->setEntity(DC); 916} 917 918void Sema::PopDeclContext() { 919 assert(CurContext && "DeclContext imbalance!"); 920 921 CurContext = getContainingDC(CurContext); 922 assert(CurContext && "Popped translation unit!"); 923} 924 925/// EnterDeclaratorContext - Used when we must lookup names in the context 926/// of a declarator's nested name specifier. 927/// 928void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 929 // C++0x [basic.lookup.unqual]p13: 930 // A name used in the definition of a static data member of class 931 // X (after the qualified-id of the static member) is looked up as 932 // if the name was used in a member function of X. 933 // C++0x [basic.lookup.unqual]p14: 934 // If a variable member of a namespace is defined outside of the 935 // scope of its namespace then any name used in the definition of 936 // the variable member (after the declarator-id) is looked up as 937 // if the definition of the variable member occurred in its 938 // namespace. 939 // Both of these imply that we should push a scope whose context 940 // is the semantic context of the declaration. We can't use 941 // PushDeclContext here because that context is not necessarily 942 // lexically contained in the current context. Fortunately, 943 // the containing scope should have the appropriate information. 944 945 assert(!S->getEntity() && "scope already has entity"); 946 947#ifndef NDEBUG 948 Scope *Ancestor = S->getParent(); 949 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 950 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 951#endif 952 953 CurContext = DC; 954 S->setEntity(DC); 955} 956 957void Sema::ExitDeclaratorContext(Scope *S) { 958 assert(S->getEntity() == CurContext && "Context imbalance!"); 959 960 // Switch back to the lexical context. The safety of this is 961 // enforced by an assert in EnterDeclaratorContext. 962 Scope *Ancestor = S->getParent(); 963 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 964 CurContext = (DeclContext*) Ancestor->getEntity(); 965 966 // We don't need to do anything with the scope, which is going to 967 // disappear. 968} 969 970 971void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 972 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 973 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 974 // We assume that the caller has already called 975 // ActOnReenterTemplateScope 976 FD = TFD->getTemplatedDecl(); 977 } 978 if (!FD) 979 return; 980 981 // Same implementation as PushDeclContext, but enters the context 982 // from the lexical parent, rather than the top-level class. 983 assert(CurContext == FD->getLexicalParent() && 984 "The next DeclContext should be lexically contained in the current one."); 985 CurContext = FD; 986 S->setEntity(CurContext); 987 988 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 989 ParmVarDecl *Param = FD->getParamDecl(P); 990 // If the parameter has an identifier, then add it to the scope 991 if (Param->getIdentifier()) { 992 S->AddDecl(Param); 993 IdResolver.AddDecl(Param); 994 } 995 } 996} 997 998 999void Sema::ActOnExitFunctionContext() { 1000 // Same implementation as PopDeclContext, but returns to the lexical parent, 1001 // rather than the top-level class. 1002 assert(CurContext && "DeclContext imbalance!"); 1003 CurContext = CurContext->getLexicalParent(); 1004 assert(CurContext && "Popped translation unit!"); 1005} 1006 1007 1008/// \brief Determine whether we allow overloading of the function 1009/// PrevDecl with another declaration. 1010/// 1011/// This routine determines whether overloading is possible, not 1012/// whether some new function is actually an overload. It will return 1013/// true in C++ (where we can always provide overloads) or, as an 1014/// extension, in C when the previous function is already an 1015/// overloaded function declaration or has the "overloadable" 1016/// attribute. 1017static bool AllowOverloadingOfFunction(LookupResult &Previous, 1018 ASTContext &Context) { 1019 if (Context.getLangOpts().CPlusPlus) 1020 return true; 1021 1022 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 1023 return true; 1024 1025 return (Previous.getResultKind() == LookupResult::Found 1026 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 1027} 1028 1029/// Add this decl to the scope shadowed decl chains. 1030void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 1031 // Move up the scope chain until we find the nearest enclosing 1032 // non-transparent context. The declaration will be introduced into this 1033 // scope. 1034 while (S->getEntity() && 1035 ((DeclContext *)S->getEntity())->isTransparentContext()) 1036 S = S->getParent(); 1037 1038 // Add scoped declarations into their context, so that they can be 1039 // found later. Declarations without a context won't be inserted 1040 // into any context. 1041 if (AddToContext) 1042 CurContext->addDecl(D); 1043 1044 // Out-of-line definitions shouldn't be pushed into scope in C++. 1045 // Out-of-line variable and function definitions shouldn't even in C. 1046 if ((getLangOpts().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 1047 D->isOutOfLine() && 1048 !D->getDeclContext()->getRedeclContext()->Equals( 1049 D->getLexicalDeclContext()->getRedeclContext())) 1050 return; 1051 1052 // Template instantiations should also not be pushed into scope. 1053 if (isa<FunctionDecl>(D) && 1054 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 1055 return; 1056 1057 // If this replaces anything in the current scope, 1058 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 1059 IEnd = IdResolver.end(); 1060 for (; I != IEnd; ++I) { 1061 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 1062 S->RemoveDecl(*I); 1063 IdResolver.RemoveDecl(*I); 1064 1065 // Should only need to replace one decl. 1066 break; 1067 } 1068 } 1069 1070 S->AddDecl(D); 1071 1072 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 1073 // Implicitly-generated labels may end up getting generated in an order that 1074 // isn't strictly lexical, which breaks name lookup. Be careful to insert 1075 // the label at the appropriate place in the identifier chain. 1076 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 1077 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 1078 if (IDC == CurContext) { 1079 if (!S->isDeclScope(*I)) 1080 continue; 1081 } else if (IDC->Encloses(CurContext)) 1082 break; 1083 } 1084 1085 IdResolver.InsertDeclAfter(I, D); 1086 } else { 1087 IdResolver.AddDecl(D); 1088 } 1089} 1090 1091void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 1092 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 1093 TUScope->AddDecl(D); 1094} 1095 1096bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 1097 bool ExplicitInstantiationOrSpecialization) { 1098 return IdResolver.isDeclInScope(D, Ctx, Context, S, 1099 ExplicitInstantiationOrSpecialization); 1100} 1101 1102Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 1103 DeclContext *TargetDC = DC->getPrimaryContext(); 1104 do { 1105 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 1106 if (ScopeDC->getPrimaryContext() == TargetDC) 1107 return S; 1108 } while ((S = S->getParent())); 1109 1110 return 0; 1111} 1112 1113static bool isOutOfScopePreviousDeclaration(NamedDecl *, 1114 DeclContext*, 1115 ASTContext&); 1116 1117/// Filters out lookup results that don't fall within the given scope 1118/// as determined by isDeclInScope. 1119void Sema::FilterLookupForScope(LookupResult &R, 1120 DeclContext *Ctx, Scope *S, 1121 bool ConsiderLinkage, 1122 bool ExplicitInstantiationOrSpecialization) { 1123 LookupResult::Filter F = R.makeFilter(); 1124 while (F.hasNext()) { 1125 NamedDecl *D = F.next(); 1126 1127 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 1128 continue; 1129 1130 if (ConsiderLinkage && 1131 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 1132 continue; 1133 1134 F.erase(); 1135 } 1136 1137 F.done(); 1138} 1139 1140static bool isUsingDecl(NamedDecl *D) { 1141 return isa<UsingShadowDecl>(D) || 1142 isa<UnresolvedUsingTypenameDecl>(D) || 1143 isa<UnresolvedUsingValueDecl>(D); 1144} 1145 1146/// Removes using shadow declarations from the lookup results. 1147static void RemoveUsingDecls(LookupResult &R) { 1148 LookupResult::Filter F = R.makeFilter(); 1149 while (F.hasNext()) 1150 if (isUsingDecl(F.next())) 1151 F.erase(); 1152 1153 F.done(); 1154} 1155 1156/// \brief Check for this common pattern: 1157/// @code 1158/// class S { 1159/// S(const S&); // DO NOT IMPLEMENT 1160/// void operator=(const S&); // DO NOT IMPLEMENT 1161/// }; 1162/// @endcode 1163static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1164 // FIXME: Should check for private access too but access is set after we get 1165 // the decl here. 1166 if (D->doesThisDeclarationHaveABody()) 1167 return false; 1168 1169 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1170 return CD->isCopyConstructor(); 1171 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1172 return Method->isCopyAssignmentOperator(); 1173 return false; 1174} 1175 1176bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1177 assert(D); 1178 1179 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1180 return false; 1181 1182 // Ignore class templates. 1183 if (D->getDeclContext()->isDependentContext() || 1184 D->getLexicalDeclContext()->isDependentContext()) 1185 return false; 1186 1187 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1188 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1189 return false; 1190 1191 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1192 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1193 return false; 1194 } else { 1195 // 'static inline' functions are used in headers; don't warn. 1196 if (FD->getStorageClass() == SC_Static && 1197 FD->isInlineSpecified()) 1198 return false; 1199 } 1200 1201 if (FD->doesThisDeclarationHaveABody() && 1202 Context.DeclMustBeEmitted(FD)) 1203 return false; 1204 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1205 if (!VD->isFileVarDecl() || 1206 VD->getType().isConstant(Context) || 1207 Context.DeclMustBeEmitted(VD)) 1208 return false; 1209 1210 if (VD->isStaticDataMember() && 1211 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1212 return false; 1213 1214 } else { 1215 return false; 1216 } 1217 1218 // Only warn for unused decls internal to the translation unit. 1219 if (D->getLinkage() == ExternalLinkage) 1220 return false; 1221 1222 return true; 1223} 1224 1225void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1226 if (!D) 1227 return; 1228 1229 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1230 const FunctionDecl *First = FD->getFirstDeclaration(); 1231 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1232 return; // First should already be in the vector. 1233 } 1234 1235 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1236 const VarDecl *First = VD->getFirstDeclaration(); 1237 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1238 return; // First should already be in the vector. 1239 } 1240 1241 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1242 UnusedFileScopedDecls.push_back(D); 1243} 1244 1245static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1246 if (D->isInvalidDecl()) 1247 return false; 1248 1249 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1250 return false; 1251 1252 if (isa<LabelDecl>(D)) 1253 return true; 1254 1255 // White-list anything that isn't a local variable. 1256 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1257 !D->getDeclContext()->isFunctionOrMethod()) 1258 return false; 1259 1260 // Types of valid local variables should be complete, so this should succeed. 1261 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1262 1263 // White-list anything with an __attribute__((unused)) type. 1264 QualType Ty = VD->getType(); 1265 1266 // Only look at the outermost level of typedef. 1267 if (const TypedefType *TT = Ty->getAs<TypedefType>()) { 1268 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1269 return false; 1270 } 1271 1272 // If we failed to complete the type for some reason, or if the type is 1273 // dependent, don't diagnose the variable. 1274 if (Ty->isIncompleteType() || Ty->isDependentType()) 1275 return false; 1276 1277 if (const TagType *TT = Ty->getAs<TagType>()) { 1278 const TagDecl *Tag = TT->getDecl(); 1279 if (Tag->hasAttr<UnusedAttr>()) 1280 return false; 1281 1282 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1283 if (!RD->hasTrivialDestructor()) 1284 return false; 1285 1286 if (const Expr *Init = VD->getInit()) { 1287 const CXXConstructExpr *Construct = 1288 dyn_cast<CXXConstructExpr>(Init); 1289 if (Construct && !Construct->isElidable()) { 1290 CXXConstructorDecl *CD = Construct->getConstructor(); 1291 if (!CD->isTrivial()) 1292 return false; 1293 } 1294 } 1295 } 1296 } 1297 1298 // TODO: __attribute__((unused)) templates? 1299 } 1300 1301 return true; 1302} 1303 1304static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1305 FixItHint &Hint) { 1306 if (isa<LabelDecl>(D)) { 1307 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1308 tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), true); 1309 if (AfterColon.isInvalid()) 1310 return; 1311 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1312 getCharRange(D->getLocStart(), AfterColon)); 1313 } 1314 return; 1315} 1316 1317/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1318/// unless they are marked attr(unused). 1319void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1320 FixItHint Hint; 1321 if (!ShouldDiagnoseUnusedDecl(D)) 1322 return; 1323 1324 GenerateFixForUnusedDecl(D, Context, Hint); 1325 1326 unsigned DiagID; 1327 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1328 DiagID = diag::warn_unused_exception_param; 1329 else if (isa<LabelDecl>(D)) 1330 DiagID = diag::warn_unused_label; 1331 else 1332 DiagID = diag::warn_unused_variable; 1333 1334 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1335} 1336 1337static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1338 // Verify that we have no forward references left. If so, there was a goto 1339 // or address of a label taken, but no definition of it. Label fwd 1340 // definitions are indicated with a null substmt. 1341 if (L->getStmt() == 0) 1342 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1343} 1344 1345void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1346 if (S->decl_empty()) return; 1347 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1348 "Scope shouldn't contain decls!"); 1349 1350 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1351 I != E; ++I) { 1352 Decl *TmpD = (*I); 1353 assert(TmpD && "This decl didn't get pushed??"); 1354 1355 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1356 NamedDecl *D = cast<NamedDecl>(TmpD); 1357 1358 if (!D->getDeclName()) continue; 1359 1360 // Diagnose unused variables in this scope. 1361 if (!S->hasErrorOccurred()) 1362 DiagnoseUnusedDecl(D); 1363 1364 // If this was a forward reference to a label, verify it was defined. 1365 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1366 CheckPoppedLabel(LD, *this); 1367 1368 // Remove this name from our lexical scope. 1369 IdResolver.RemoveDecl(D); 1370 } 1371} 1372 1373void Sema::ActOnStartFunctionDeclarator() { 1374 ++InFunctionDeclarator; 1375} 1376 1377void Sema::ActOnEndFunctionDeclarator() { 1378 assert(InFunctionDeclarator); 1379 --InFunctionDeclarator; 1380} 1381 1382/// \brief Look for an Objective-C class in the translation unit. 1383/// 1384/// \param Id The name of the Objective-C class we're looking for. If 1385/// typo-correction fixes this name, the Id will be updated 1386/// to the fixed name. 1387/// 1388/// \param IdLoc The location of the name in the translation unit. 1389/// 1390/// \param DoTypoCorrection If true, this routine will attempt typo correction 1391/// if there is no class with the given name. 1392/// 1393/// \returns The declaration of the named Objective-C class, or NULL if the 1394/// class could not be found. 1395ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1396 SourceLocation IdLoc, 1397 bool DoTypoCorrection) { 1398 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1399 // creation from this context. 1400 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1401 1402 if (!IDecl && DoTypoCorrection) { 1403 // Perform typo correction at the given location, but only if we 1404 // find an Objective-C class name. 1405 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1406 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1407 LookupOrdinaryName, TUScope, NULL, 1408 Validator)) { 1409 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1410 Diag(IdLoc, diag::err_undef_interface_suggest) 1411 << Id << IDecl->getDeclName() 1412 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1413 Diag(IDecl->getLocation(), diag::note_previous_decl) 1414 << IDecl->getDeclName(); 1415 1416 Id = IDecl->getIdentifier(); 1417 } 1418 } 1419 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1420 // This routine must always return a class definition, if any. 1421 if (Def && Def->getDefinition()) 1422 Def = Def->getDefinition(); 1423 return Def; 1424} 1425 1426/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1427/// from S, where a non-field would be declared. This routine copes 1428/// with the difference between C and C++ scoping rules in structs and 1429/// unions. For example, the following code is well-formed in C but 1430/// ill-formed in C++: 1431/// @code 1432/// struct S6 { 1433/// enum { BAR } e; 1434/// }; 1435/// 1436/// void test_S6() { 1437/// struct S6 a; 1438/// a.e = BAR; 1439/// } 1440/// @endcode 1441/// For the declaration of BAR, this routine will return a different 1442/// scope. The scope S will be the scope of the unnamed enumeration 1443/// within S6. In C++, this routine will return the scope associated 1444/// with S6, because the enumeration's scope is a transparent 1445/// context but structures can contain non-field names. In C, this 1446/// routine will return the translation unit scope, since the 1447/// enumeration's scope is a transparent context and structures cannot 1448/// contain non-field names. 1449Scope *Sema::getNonFieldDeclScope(Scope *S) { 1450 while (((S->getFlags() & Scope::DeclScope) == 0) || 1451 (S->getEntity() && 1452 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1453 (S->isClassScope() && !getLangOpts().CPlusPlus)) 1454 S = S->getParent(); 1455 return S; 1456} 1457 1458/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1459/// file scope. lazily create a decl for it. ForRedeclaration is true 1460/// if we're creating this built-in in anticipation of redeclaring the 1461/// built-in. 1462NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1463 Scope *S, bool ForRedeclaration, 1464 SourceLocation Loc) { 1465 Builtin::ID BID = (Builtin::ID)bid; 1466 1467 ASTContext::GetBuiltinTypeError Error; 1468 QualType R = Context.GetBuiltinType(BID, Error); 1469 switch (Error) { 1470 case ASTContext::GE_None: 1471 // Okay 1472 break; 1473 1474 case ASTContext::GE_Missing_stdio: 1475 if (ForRedeclaration) 1476 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1477 << Context.BuiltinInfo.GetName(BID); 1478 return 0; 1479 1480 case ASTContext::GE_Missing_setjmp: 1481 if (ForRedeclaration) 1482 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1483 << Context.BuiltinInfo.GetName(BID); 1484 return 0; 1485 1486 case ASTContext::GE_Missing_ucontext: 1487 if (ForRedeclaration) 1488 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1489 << Context.BuiltinInfo.GetName(BID); 1490 return 0; 1491 } 1492 1493 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1494 Diag(Loc, diag::ext_implicit_lib_function_decl) 1495 << Context.BuiltinInfo.GetName(BID) 1496 << R; 1497 if (Context.BuiltinInfo.getHeaderName(BID) && 1498 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1499 != DiagnosticsEngine::Ignored) 1500 Diag(Loc, diag::note_please_include_header) 1501 << Context.BuiltinInfo.getHeaderName(BID) 1502 << Context.BuiltinInfo.GetName(BID); 1503 } 1504 1505 FunctionDecl *New = FunctionDecl::Create(Context, 1506 Context.getTranslationUnitDecl(), 1507 Loc, Loc, II, R, /*TInfo=*/0, 1508 SC_Extern, 1509 SC_None, false, 1510 /*hasPrototype=*/true); 1511 New->setImplicit(); 1512 1513 // Create Decl objects for each parameter, adding them to the 1514 // FunctionDecl. 1515 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1516 SmallVector<ParmVarDecl*, 16> Params; 1517 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1518 ParmVarDecl *parm = 1519 ParmVarDecl::Create(Context, New, SourceLocation(), 1520 SourceLocation(), 0, 1521 FT->getArgType(i), /*TInfo=*/0, 1522 SC_None, SC_None, 0); 1523 parm->setScopeInfo(0, i); 1524 Params.push_back(parm); 1525 } 1526 New->setParams(Params); 1527 } 1528 1529 AddKnownFunctionAttributes(New); 1530 1531 // TUScope is the translation-unit scope to insert this function into. 1532 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1533 // relate Scopes to DeclContexts, and probably eliminate CurContext 1534 // entirely, but we're not there yet. 1535 DeclContext *SavedContext = CurContext; 1536 CurContext = Context.getTranslationUnitDecl(); 1537 PushOnScopeChains(New, TUScope); 1538 CurContext = SavedContext; 1539 return New; 1540} 1541 1542bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1543 QualType OldType; 1544 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1545 OldType = OldTypedef->getUnderlyingType(); 1546 else 1547 OldType = Context.getTypeDeclType(Old); 1548 QualType NewType = New->getUnderlyingType(); 1549 1550 if (NewType->isVariablyModifiedType()) { 1551 // Must not redefine a typedef with a variably-modified type. 1552 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1553 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1554 << Kind << NewType; 1555 if (Old->getLocation().isValid()) 1556 Diag(Old->getLocation(), diag::note_previous_definition); 1557 New->setInvalidDecl(); 1558 return true; 1559 } 1560 1561 if (OldType != NewType && 1562 !OldType->isDependentType() && 1563 !NewType->isDependentType() && 1564 !Context.hasSameType(OldType, NewType)) { 1565 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1566 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1567 << Kind << NewType << OldType; 1568 if (Old->getLocation().isValid()) 1569 Diag(Old->getLocation(), diag::note_previous_definition); 1570 New->setInvalidDecl(); 1571 return true; 1572 } 1573 return false; 1574} 1575 1576/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1577/// same name and scope as a previous declaration 'Old'. Figure out 1578/// how to resolve this situation, merging decls or emitting 1579/// diagnostics as appropriate. If there was an error, set New to be invalid. 1580/// 1581void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1582 // If the new decl is known invalid already, don't bother doing any 1583 // merging checks. 1584 if (New->isInvalidDecl()) return; 1585 1586 // Allow multiple definitions for ObjC built-in typedefs. 1587 // FIXME: Verify the underlying types are equivalent! 1588 if (getLangOpts().ObjC1) { 1589 const IdentifierInfo *TypeID = New->getIdentifier(); 1590 switch (TypeID->getLength()) { 1591 default: break; 1592 case 2: 1593 { 1594 if (!TypeID->isStr("id")) 1595 break; 1596 QualType T = New->getUnderlyingType(); 1597 if (!T->isPointerType()) 1598 break; 1599 if (!T->isVoidPointerType()) { 1600 QualType PT = T->getAs<PointerType>()->getPointeeType(); 1601 if (!PT->isStructureType()) 1602 break; 1603 } 1604 Context.setObjCIdRedefinitionType(T); 1605 // Install the built-in type for 'id', ignoring the current definition. 1606 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1607 return; 1608 } 1609 case 5: 1610 if (!TypeID->isStr("Class")) 1611 break; 1612 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1613 // Install the built-in type for 'Class', ignoring the current definition. 1614 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1615 return; 1616 case 3: 1617 if (!TypeID->isStr("SEL")) 1618 break; 1619 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1620 // Install the built-in type for 'SEL', ignoring the current definition. 1621 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1622 return; 1623 } 1624 // Fall through - the typedef name was not a builtin type. 1625 } 1626 1627 // Verify the old decl was also a type. 1628 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1629 if (!Old) { 1630 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1631 << New->getDeclName(); 1632 1633 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1634 if (OldD->getLocation().isValid()) 1635 Diag(OldD->getLocation(), diag::note_previous_definition); 1636 1637 return New->setInvalidDecl(); 1638 } 1639 1640 // If the old declaration is invalid, just give up here. 1641 if (Old->isInvalidDecl()) 1642 return New->setInvalidDecl(); 1643 1644 // If the typedef types are not identical, reject them in all languages and 1645 // with any extensions enabled. 1646 if (isIncompatibleTypedef(Old, New)) 1647 return; 1648 1649 // The types match. Link up the redeclaration chain if the old 1650 // declaration was a typedef. 1651 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1652 New->setPreviousDeclaration(Typedef); 1653 1654 if (getLangOpts().MicrosoftExt) 1655 return; 1656 1657 if (getLangOpts().CPlusPlus) { 1658 // C++ [dcl.typedef]p2: 1659 // In a given non-class scope, a typedef specifier can be used to 1660 // redefine the name of any type declared in that scope to refer 1661 // to the type to which it already refers. 1662 if (!isa<CXXRecordDecl>(CurContext)) 1663 return; 1664 1665 // C++0x [dcl.typedef]p4: 1666 // In a given class scope, a typedef specifier can be used to redefine 1667 // any class-name declared in that scope that is not also a typedef-name 1668 // to refer to the type to which it already refers. 1669 // 1670 // This wording came in via DR424, which was a correction to the 1671 // wording in DR56, which accidentally banned code like: 1672 // 1673 // struct S { 1674 // typedef struct A { } A; 1675 // }; 1676 // 1677 // in the C++03 standard. We implement the C++0x semantics, which 1678 // allow the above but disallow 1679 // 1680 // struct S { 1681 // typedef int I; 1682 // typedef int I; 1683 // }; 1684 // 1685 // since that was the intent of DR56. 1686 if (!isa<TypedefNameDecl>(Old)) 1687 return; 1688 1689 Diag(New->getLocation(), diag::err_redefinition) 1690 << New->getDeclName(); 1691 Diag(Old->getLocation(), diag::note_previous_definition); 1692 return New->setInvalidDecl(); 1693 } 1694 1695 // Modules always permit redefinition of typedefs, as does C11. 1696 if (getLangOpts().Modules || getLangOpts().C11) 1697 return; 1698 1699 // If we have a redefinition of a typedef in C, emit a warning. This warning 1700 // is normally mapped to an error, but can be controlled with 1701 // -Wtypedef-redefinition. If either the original or the redefinition is 1702 // in a system header, don't emit this for compatibility with GCC. 1703 if (getDiagnostics().getSuppressSystemWarnings() && 1704 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1705 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1706 return; 1707 1708 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1709 << New->getDeclName(); 1710 Diag(Old->getLocation(), diag::note_previous_definition); 1711 return; 1712} 1713 1714/// DeclhasAttr - returns true if decl Declaration already has the target 1715/// attribute. 1716static bool 1717DeclHasAttr(const Decl *D, const Attr *A) { 1718 // There can be multiple AvailabilityAttr in a Decl. Make sure we copy 1719 // all of them. It is mergeAvailabilityAttr in SemaDeclAttr.cpp that is 1720 // responsible for making sure they are consistent. 1721 const AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(A); 1722 if (AA) 1723 return false; 1724 1725 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1726 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1727 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1728 if ((*i)->getKind() == A->getKind()) { 1729 if (Ann) { 1730 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1731 return true; 1732 continue; 1733 } 1734 // FIXME: Don't hardcode this check 1735 if (OA && isa<OwnershipAttr>(*i)) 1736 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1737 return true; 1738 } 1739 1740 return false; 1741} 1742 1743bool Sema::mergeDeclAttribute(Decl *D, InheritableAttr *Attr) { 1744 InheritableAttr *NewAttr = NULL; 1745 if (AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(Attr)) 1746 NewAttr = mergeAvailabilityAttr(D, AA->getRange(), AA->getPlatform(), 1747 AA->getIntroduced(), AA->getDeprecated(), 1748 AA->getObsoleted(), AA->getUnavailable(), 1749 AA->getMessage()); 1750 else if (VisibilityAttr *VA = dyn_cast<VisibilityAttr>(Attr)) 1751 NewAttr = mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility()); 1752 else if (DLLImportAttr *ImportA = dyn_cast<DLLImportAttr>(Attr)) 1753 NewAttr = mergeDLLImportAttr(D, ImportA->getRange()); 1754 else if (DLLExportAttr *ExportA = dyn_cast<DLLExportAttr>(Attr)) 1755 NewAttr = mergeDLLExportAttr(D, ExportA->getRange()); 1756 else if (FormatAttr *FA = dyn_cast<FormatAttr>(Attr)) 1757 NewAttr = mergeFormatAttr(D, FA->getRange(), FA->getType(), 1758 FA->getFormatIdx(), FA->getFirstArg()); 1759 else if (SectionAttr *SA = dyn_cast<SectionAttr>(Attr)) 1760 NewAttr = mergeSectionAttr(D, SA->getRange(), SA->getName()); 1761 else if (!DeclHasAttr(D, Attr)) 1762 NewAttr = cast<InheritableAttr>(Attr->clone(Context)); 1763 1764 if (NewAttr) { 1765 NewAttr->setInherited(true); 1766 D->addAttr(NewAttr); 1767 return true; 1768 } 1769 1770 return false; 1771} 1772 1773static const Decl *getDefinition(const Decl *D) { 1774 if (const TagDecl *TD = dyn_cast<TagDecl>(D)) 1775 return TD->getDefinition(); 1776 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 1777 return VD->getDefinition(); 1778 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1779 const FunctionDecl* Def; 1780 if (FD->hasBody(Def)) 1781 return Def; 1782 } 1783 return NULL; 1784} 1785 1786static bool hasAttribute(const Decl *D, attr::Kind Kind) { 1787 for (Decl::attr_iterator I = D->attr_begin(), E = D->attr_end(); 1788 I != E; ++I) { 1789 Attr *Attribute = *I; 1790 if (Attribute->getKind() == Kind) 1791 return true; 1792 } 1793 return false; 1794} 1795 1796/// checkNewAttributesAfterDef - If we already have a definition, check that 1797/// there are no new attributes in this declaration. 1798static void checkNewAttributesAfterDef(Sema &S, Decl *New, const Decl *Old) { 1799 if (!New->hasAttrs()) 1800 return; 1801 1802 const Decl *Def = getDefinition(Old); 1803 if (!Def || Def == New) 1804 return; 1805 1806 AttrVec &NewAttributes = New->getAttrs(); 1807 for (unsigned I = 0, E = NewAttributes.size(); I != E;) { 1808 const Attr *NewAttribute = NewAttributes[I]; 1809 if (hasAttribute(Def, NewAttribute->getKind())) { 1810 ++I; 1811 continue; // regular attr merging will take care of validating this. 1812 } 1813 S.Diag(NewAttribute->getLocation(), 1814 diag::warn_attribute_precede_definition); 1815 S.Diag(Def->getLocation(), diag::note_previous_definition); 1816 NewAttributes.erase(NewAttributes.begin() + I); 1817 --E; 1818 } 1819} 1820 1821/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1822void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1823 bool MergeDeprecation) { 1824 // attributes declared post-definition are currently ignored 1825 checkNewAttributesAfterDef(*this, New, Old); 1826 1827 if (!Old->hasAttrs()) 1828 return; 1829 1830 bool foundAny = New->hasAttrs(); 1831 1832 // Ensure that any moving of objects within the allocated map is done before 1833 // we process them. 1834 if (!foundAny) New->setAttrs(AttrVec()); 1835 1836 for (specific_attr_iterator<InheritableAttr> 1837 i = Old->specific_attr_begin<InheritableAttr>(), 1838 e = Old->specific_attr_end<InheritableAttr>(); 1839 i != e; ++i) { 1840 // Ignore deprecated/unavailable/availability attributes if requested. 1841 if (!MergeDeprecation && 1842 (isa<DeprecatedAttr>(*i) || 1843 isa<UnavailableAttr>(*i) || 1844 isa<AvailabilityAttr>(*i))) 1845 continue; 1846 1847 if (mergeDeclAttribute(New, *i)) 1848 foundAny = true; 1849 } 1850 1851 if (!foundAny) New->dropAttrs(); 1852} 1853 1854/// mergeParamDeclAttributes - Copy attributes from the old parameter 1855/// to the new one. 1856static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1857 const ParmVarDecl *oldDecl, 1858 ASTContext &C) { 1859 if (!oldDecl->hasAttrs()) 1860 return; 1861 1862 bool foundAny = newDecl->hasAttrs(); 1863 1864 // Ensure that any moving of objects within the allocated map is 1865 // done before we process them. 1866 if (!foundAny) newDecl->setAttrs(AttrVec()); 1867 1868 for (specific_attr_iterator<InheritableParamAttr> 1869 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1870 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1871 if (!DeclHasAttr(newDecl, *i)) { 1872 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1873 newAttr->setInherited(true); 1874 newDecl->addAttr(newAttr); 1875 foundAny = true; 1876 } 1877 } 1878 1879 if (!foundAny) newDecl->dropAttrs(); 1880} 1881 1882namespace { 1883 1884/// Used in MergeFunctionDecl to keep track of function parameters in 1885/// C. 1886struct GNUCompatibleParamWarning { 1887 ParmVarDecl *OldParm; 1888 ParmVarDecl *NewParm; 1889 QualType PromotedType; 1890}; 1891 1892} 1893 1894/// getSpecialMember - get the special member enum for a method. 1895Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1896 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1897 if (Ctor->isDefaultConstructor()) 1898 return Sema::CXXDefaultConstructor; 1899 1900 if (Ctor->isCopyConstructor()) 1901 return Sema::CXXCopyConstructor; 1902 1903 if (Ctor->isMoveConstructor()) 1904 return Sema::CXXMoveConstructor; 1905 } else if (isa<CXXDestructorDecl>(MD)) { 1906 return Sema::CXXDestructor; 1907 } else if (MD->isCopyAssignmentOperator()) { 1908 return Sema::CXXCopyAssignment; 1909 } else if (MD->isMoveAssignmentOperator()) { 1910 return Sema::CXXMoveAssignment; 1911 } 1912 1913 return Sema::CXXInvalid; 1914} 1915 1916/// canRedefineFunction - checks if a function can be redefined. Currently, 1917/// only extern inline functions can be redefined, and even then only in 1918/// GNU89 mode. 1919static bool canRedefineFunction(const FunctionDecl *FD, 1920 const LangOptions& LangOpts) { 1921 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1922 !LangOpts.CPlusPlus && 1923 FD->isInlineSpecified() && 1924 FD->getStorageClass() == SC_Extern); 1925} 1926 1927/// Is the given calling convention the ABI default for the given 1928/// declaration? 1929static bool isABIDefaultCC(Sema &S, CallingConv CC, FunctionDecl *D) { 1930 CallingConv ABIDefaultCC; 1931 if (isa<CXXMethodDecl>(D) && cast<CXXMethodDecl>(D)->isInstance()) { 1932 ABIDefaultCC = S.Context.getDefaultCXXMethodCallConv(D->isVariadic()); 1933 } else { 1934 // Free C function or a static method. 1935 ABIDefaultCC = (S.Context.getLangOpts().MRTD ? CC_X86StdCall : CC_C); 1936 } 1937 return ABIDefaultCC == CC; 1938} 1939 1940/// MergeFunctionDecl - We just parsed a function 'New' from 1941/// declarator D which has the same name and scope as a previous 1942/// declaration 'Old'. Figure out how to resolve this situation, 1943/// merging decls or emitting diagnostics as appropriate. 1944/// 1945/// In C++, New and Old must be declarations that are not 1946/// overloaded. Use IsOverload to determine whether New and Old are 1947/// overloaded, and to select the Old declaration that New should be 1948/// merged with. 1949/// 1950/// Returns true if there was an error, false otherwise. 1951bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) { 1952 // Verify the old decl was also a function. 1953 FunctionDecl *Old = 0; 1954 if (FunctionTemplateDecl *OldFunctionTemplate 1955 = dyn_cast<FunctionTemplateDecl>(OldD)) 1956 Old = OldFunctionTemplate->getTemplatedDecl(); 1957 else 1958 Old = dyn_cast<FunctionDecl>(OldD); 1959 if (!Old) { 1960 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1961 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1962 Diag(Shadow->getTargetDecl()->getLocation(), 1963 diag::note_using_decl_target); 1964 Diag(Shadow->getUsingDecl()->getLocation(), 1965 diag::note_using_decl) << 0; 1966 return true; 1967 } 1968 1969 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1970 << New->getDeclName(); 1971 Diag(OldD->getLocation(), diag::note_previous_definition); 1972 return true; 1973 } 1974 1975 // Determine whether the previous declaration was a definition, 1976 // implicit declaration, or a declaration. 1977 diag::kind PrevDiag; 1978 if (Old->isThisDeclarationADefinition()) 1979 PrevDiag = diag::note_previous_definition; 1980 else if (Old->isImplicit()) 1981 PrevDiag = diag::note_previous_implicit_declaration; 1982 else 1983 PrevDiag = diag::note_previous_declaration; 1984 1985 QualType OldQType = Context.getCanonicalType(Old->getType()); 1986 QualType NewQType = Context.getCanonicalType(New->getType()); 1987 1988 // Don't complain about this if we're in GNU89 mode and the old function 1989 // is an extern inline function. 1990 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1991 New->getStorageClass() == SC_Static && 1992 Old->getStorageClass() != SC_Static && 1993 !canRedefineFunction(Old, getLangOpts())) { 1994 if (getLangOpts().MicrosoftExt) { 1995 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1996 Diag(Old->getLocation(), PrevDiag); 1997 } else { 1998 Diag(New->getLocation(), diag::err_static_non_static) << New; 1999 Diag(Old->getLocation(), PrevDiag); 2000 return true; 2001 } 2002 } 2003 2004 // If a function is first declared with a calling convention, but is 2005 // later declared or defined without one, the second decl assumes the 2006 // calling convention of the first. 2007 // 2008 // It's OK if a function is first declared without a calling convention, 2009 // but is later declared or defined with the default calling convention. 2010 // 2011 // For the new decl, we have to look at the NON-canonical type to tell the 2012 // difference between a function that really doesn't have a calling 2013 // convention and one that is declared cdecl. That's because in 2014 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 2015 // because it is the default calling convention. 2016 // 2017 // Note also that we DO NOT return at this point, because we still have 2018 // other tests to run. 2019 const FunctionType *OldType = cast<FunctionType>(OldQType); 2020 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 2021 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 2022 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 2023 bool RequiresAdjustment = false; 2024 if (OldTypeInfo.getCC() == NewTypeInfo.getCC()) { 2025 // Fast path: nothing to do. 2026 2027 // Inherit the CC from the previous declaration if it was specified 2028 // there but not here. 2029 } else if (NewTypeInfo.getCC() == CC_Default) { 2030 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 2031 RequiresAdjustment = true; 2032 2033 // Don't complain about mismatches when the default CC is 2034 // effectively the same as the explict one. 2035 } else if (OldTypeInfo.getCC() == CC_Default && 2036 isABIDefaultCC(*this, NewTypeInfo.getCC(), New)) { 2037 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 2038 RequiresAdjustment = true; 2039 2040 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 2041 NewTypeInfo.getCC())) { 2042 // Calling conventions really aren't compatible, so complain. 2043 Diag(New->getLocation(), diag::err_cconv_change) 2044 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 2045 << (OldTypeInfo.getCC() == CC_Default) 2046 << (OldTypeInfo.getCC() == CC_Default ? "" : 2047 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 2048 Diag(Old->getLocation(), diag::note_previous_declaration); 2049 return true; 2050 } 2051 2052 // FIXME: diagnose the other way around? 2053 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 2054 NewTypeInfo = NewTypeInfo.withNoReturn(true); 2055 RequiresAdjustment = true; 2056 } 2057 2058 // Merge regparm attribute. 2059 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 2060 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 2061 if (NewTypeInfo.getHasRegParm()) { 2062 Diag(New->getLocation(), diag::err_regparm_mismatch) 2063 << NewType->getRegParmType() 2064 << OldType->getRegParmType(); 2065 Diag(Old->getLocation(), diag::note_previous_declaration); 2066 return true; 2067 } 2068 2069 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 2070 RequiresAdjustment = true; 2071 } 2072 2073 // Merge ns_returns_retained attribute. 2074 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 2075 if (NewTypeInfo.getProducesResult()) { 2076 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 2077 Diag(Old->getLocation(), diag::note_previous_declaration); 2078 return true; 2079 } 2080 2081 NewTypeInfo = NewTypeInfo.withProducesResult(true); 2082 RequiresAdjustment = true; 2083 } 2084 2085 if (RequiresAdjustment) { 2086 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 2087 New->setType(QualType(NewType, 0)); 2088 NewQType = Context.getCanonicalType(New->getType()); 2089 } 2090 2091 if (getLangOpts().CPlusPlus) { 2092 // (C++98 13.1p2): 2093 // Certain function declarations cannot be overloaded: 2094 // -- Function declarations that differ only in the return type 2095 // cannot be overloaded. 2096 QualType OldReturnType = OldType->getResultType(); 2097 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 2098 QualType ResQT; 2099 if (OldReturnType != NewReturnType) { 2100 if (NewReturnType->isObjCObjectPointerType() 2101 && OldReturnType->isObjCObjectPointerType()) 2102 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 2103 if (ResQT.isNull()) { 2104 if (New->isCXXClassMember() && New->isOutOfLine()) 2105 Diag(New->getLocation(), 2106 diag::err_member_def_does_not_match_ret_type) << New; 2107 else 2108 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 2109 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2110 return true; 2111 } 2112 else 2113 NewQType = ResQT; 2114 } 2115 2116 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 2117 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 2118 if (OldMethod && NewMethod) { 2119 // Preserve triviality. 2120 NewMethod->setTrivial(OldMethod->isTrivial()); 2121 2122 // MSVC allows explicit template specialization at class scope: 2123 // 2 CXMethodDecls referring to the same function will be injected. 2124 // We don't want a redeclartion error. 2125 bool IsClassScopeExplicitSpecialization = 2126 OldMethod->isFunctionTemplateSpecialization() && 2127 NewMethod->isFunctionTemplateSpecialization(); 2128 bool isFriend = NewMethod->getFriendObjectKind(); 2129 2130 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 2131 !IsClassScopeExplicitSpecialization) { 2132 // -- Member function declarations with the same name and the 2133 // same parameter types cannot be overloaded if any of them 2134 // is a static member function declaration. 2135 if (OldMethod->isStatic() || NewMethod->isStatic()) { 2136 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 2137 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2138 return true; 2139 } 2140 2141 // C++ [class.mem]p1: 2142 // [...] A member shall not be declared twice in the 2143 // member-specification, except that a nested class or member 2144 // class template can be declared and then later defined. 2145 if (ActiveTemplateInstantiations.empty()) { 2146 unsigned NewDiag; 2147 if (isa<CXXConstructorDecl>(OldMethod)) 2148 NewDiag = diag::err_constructor_redeclared; 2149 else if (isa<CXXDestructorDecl>(NewMethod)) 2150 NewDiag = diag::err_destructor_redeclared; 2151 else if (isa<CXXConversionDecl>(NewMethod)) 2152 NewDiag = diag::err_conv_function_redeclared; 2153 else 2154 NewDiag = diag::err_member_redeclared; 2155 2156 Diag(New->getLocation(), NewDiag); 2157 } else { 2158 Diag(New->getLocation(), diag::err_member_redeclared_in_instantiation) 2159 << New << New->getType(); 2160 } 2161 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2162 2163 // Complain if this is an explicit declaration of a special 2164 // member that was initially declared implicitly. 2165 // 2166 // As an exception, it's okay to befriend such methods in order 2167 // to permit the implicit constructor/destructor/operator calls. 2168 } else if (OldMethod->isImplicit()) { 2169 if (isFriend) { 2170 NewMethod->setImplicit(); 2171 } else { 2172 Diag(NewMethod->getLocation(), 2173 diag::err_definition_of_implicitly_declared_member) 2174 << New << getSpecialMember(OldMethod); 2175 return true; 2176 } 2177 } else if (OldMethod->isExplicitlyDefaulted() && !isFriend) { 2178 Diag(NewMethod->getLocation(), 2179 diag::err_definition_of_explicitly_defaulted_member) 2180 << getSpecialMember(OldMethod); 2181 return true; 2182 } 2183 } 2184 2185 // (C++98 8.3.5p3): 2186 // All declarations for a function shall agree exactly in both the 2187 // return type and the parameter-type-list. 2188 // We also want to respect all the extended bits except noreturn. 2189 2190 // noreturn should now match unless the old type info didn't have it. 2191 QualType OldQTypeForComparison = OldQType; 2192 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 2193 assert(OldQType == QualType(OldType, 0)); 2194 const FunctionType *OldTypeForComparison 2195 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 2196 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 2197 assert(OldQTypeForComparison.isCanonical()); 2198 } 2199 2200 if (OldQTypeForComparison == NewQType) 2201 return MergeCompatibleFunctionDecls(New, Old, S); 2202 2203 // Fall through for conflicting redeclarations and redefinitions. 2204 } 2205 2206 // C: Function types need to be compatible, not identical. This handles 2207 // duplicate function decls like "void f(int); void f(enum X);" properly. 2208 if (!getLangOpts().CPlusPlus && 2209 Context.typesAreCompatible(OldQType, NewQType)) { 2210 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 2211 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 2212 const FunctionProtoType *OldProto = 0; 2213 if (isa<FunctionNoProtoType>(NewFuncType) && 2214 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 2215 // The old declaration provided a function prototype, but the 2216 // new declaration does not. Merge in the prototype. 2217 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 2218 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 2219 OldProto->arg_type_end()); 2220 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 2221 ParamTypes.data(), ParamTypes.size(), 2222 OldProto->getExtProtoInfo()); 2223 New->setType(NewQType); 2224 New->setHasInheritedPrototype(); 2225 2226 // Synthesize a parameter for each argument type. 2227 SmallVector<ParmVarDecl*, 16> Params; 2228 for (FunctionProtoType::arg_type_iterator 2229 ParamType = OldProto->arg_type_begin(), 2230 ParamEnd = OldProto->arg_type_end(); 2231 ParamType != ParamEnd; ++ParamType) { 2232 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 2233 SourceLocation(), 2234 SourceLocation(), 0, 2235 *ParamType, /*TInfo=*/0, 2236 SC_None, SC_None, 2237 0); 2238 Param->setScopeInfo(0, Params.size()); 2239 Param->setImplicit(); 2240 Params.push_back(Param); 2241 } 2242 2243 New->setParams(Params); 2244 } 2245 2246 return MergeCompatibleFunctionDecls(New, Old, S); 2247 } 2248 2249 // GNU C permits a K&R definition to follow a prototype declaration 2250 // if the declared types of the parameters in the K&R definition 2251 // match the types in the prototype declaration, even when the 2252 // promoted types of the parameters from the K&R definition differ 2253 // from the types in the prototype. GCC then keeps the types from 2254 // the prototype. 2255 // 2256 // If a variadic prototype is followed by a non-variadic K&R definition, 2257 // the K&R definition becomes variadic. This is sort of an edge case, but 2258 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2259 // C99 6.9.1p8. 2260 if (!getLangOpts().CPlusPlus && 2261 Old->hasPrototype() && !New->hasPrototype() && 2262 New->getType()->getAs<FunctionProtoType>() && 2263 Old->getNumParams() == New->getNumParams()) { 2264 SmallVector<QualType, 16> ArgTypes; 2265 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2266 const FunctionProtoType *OldProto 2267 = Old->getType()->getAs<FunctionProtoType>(); 2268 const FunctionProtoType *NewProto 2269 = New->getType()->getAs<FunctionProtoType>(); 2270 2271 // Determine whether this is the GNU C extension. 2272 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2273 NewProto->getResultType()); 2274 bool LooseCompatible = !MergedReturn.isNull(); 2275 for (unsigned Idx = 0, End = Old->getNumParams(); 2276 LooseCompatible && Idx != End; ++Idx) { 2277 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2278 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2279 if (Context.typesAreCompatible(OldParm->getType(), 2280 NewProto->getArgType(Idx))) { 2281 ArgTypes.push_back(NewParm->getType()); 2282 } else if (Context.typesAreCompatible(OldParm->getType(), 2283 NewParm->getType(), 2284 /*CompareUnqualified=*/true)) { 2285 GNUCompatibleParamWarning Warn 2286 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2287 Warnings.push_back(Warn); 2288 ArgTypes.push_back(NewParm->getType()); 2289 } else 2290 LooseCompatible = false; 2291 } 2292 2293 if (LooseCompatible) { 2294 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2295 Diag(Warnings[Warn].NewParm->getLocation(), 2296 diag::ext_param_promoted_not_compatible_with_prototype) 2297 << Warnings[Warn].PromotedType 2298 << Warnings[Warn].OldParm->getType(); 2299 if (Warnings[Warn].OldParm->getLocation().isValid()) 2300 Diag(Warnings[Warn].OldParm->getLocation(), 2301 diag::note_previous_declaration); 2302 } 2303 2304 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2305 ArgTypes.size(), 2306 OldProto->getExtProtoInfo())); 2307 return MergeCompatibleFunctionDecls(New, Old, S); 2308 } 2309 2310 // Fall through to diagnose conflicting types. 2311 } 2312 2313 // A function that has already been declared has been redeclared or defined 2314 // with a different type- show appropriate diagnostic 2315 if (unsigned BuiltinID = Old->getBuiltinID()) { 2316 // The user has declared a builtin function with an incompatible 2317 // signature. 2318 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2319 // The function the user is redeclaring is a library-defined 2320 // function like 'malloc' or 'printf'. Warn about the 2321 // redeclaration, then pretend that we don't know about this 2322 // library built-in. 2323 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2324 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2325 << Old << Old->getType(); 2326 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2327 Old->setInvalidDecl(); 2328 return false; 2329 } 2330 2331 PrevDiag = diag::note_previous_builtin_declaration; 2332 } 2333 2334 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2335 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2336 return true; 2337} 2338 2339/// \brief Completes the merge of two function declarations that are 2340/// known to be compatible. 2341/// 2342/// This routine handles the merging of attributes and other 2343/// properties of function declarations form the old declaration to 2344/// the new declaration, once we know that New is in fact a 2345/// redeclaration of Old. 2346/// 2347/// \returns false 2348bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old, 2349 Scope *S) { 2350 // Merge the attributes 2351 mergeDeclAttributes(New, Old); 2352 2353 // Merge the storage class. 2354 if (Old->getStorageClass() != SC_Extern && 2355 Old->getStorageClass() != SC_None) 2356 New->setStorageClass(Old->getStorageClass()); 2357 2358 // Merge "pure" flag. 2359 if (Old->isPure()) 2360 New->setPure(); 2361 2362 // Merge attributes from the parameters. These can mismatch with K&R 2363 // declarations. 2364 if (New->getNumParams() == Old->getNumParams()) 2365 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2366 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2367 Context); 2368 2369 if (getLangOpts().CPlusPlus) 2370 return MergeCXXFunctionDecl(New, Old, S); 2371 2372 return false; 2373} 2374 2375 2376void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2377 ObjCMethodDecl *oldMethod) { 2378 2379 // Merge the attributes, including deprecated/unavailable 2380 mergeDeclAttributes(newMethod, oldMethod, /* mergeDeprecation */true); 2381 2382 // Merge attributes from the parameters. 2383 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(), 2384 oe = oldMethod->param_end(); 2385 for (ObjCMethodDecl::param_iterator 2386 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2387 ni != ne && oi != oe; ++ni, ++oi) 2388 mergeParamDeclAttributes(*ni, *oi, Context); 2389 2390 CheckObjCMethodOverride(newMethod, oldMethod, true); 2391} 2392 2393/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2394/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2395/// emitting diagnostics as appropriate. 2396/// 2397/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2398/// to here in AddInitializerToDecl. We can't check them before the initializer 2399/// is attached. 2400void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2401 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2402 return; 2403 2404 QualType MergedT; 2405 if (getLangOpts().CPlusPlus) { 2406 AutoType *AT = New->getType()->getContainedAutoType(); 2407 if (AT && !AT->isDeduced()) { 2408 // We don't know what the new type is until the initializer is attached. 2409 return; 2410 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2411 // These could still be something that needs exception specs checked. 2412 return MergeVarDeclExceptionSpecs(New, Old); 2413 } 2414 // C++ [basic.link]p10: 2415 // [...] the types specified by all declarations referring to a given 2416 // object or function shall be identical, except that declarations for an 2417 // array object can specify array types that differ by the presence or 2418 // absence of a major array bound (8.3.4). 2419 else if (Old->getType()->isIncompleteArrayType() && 2420 New->getType()->isArrayType()) { 2421 CanQual<ArrayType> OldArray 2422 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2423 CanQual<ArrayType> NewArray 2424 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2425 if (OldArray->getElementType() == NewArray->getElementType()) 2426 MergedT = New->getType(); 2427 } else if (Old->getType()->isArrayType() && 2428 New->getType()->isIncompleteArrayType()) { 2429 CanQual<ArrayType> OldArray 2430 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2431 CanQual<ArrayType> NewArray 2432 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2433 if (OldArray->getElementType() == NewArray->getElementType()) 2434 MergedT = Old->getType(); 2435 } else if (New->getType()->isObjCObjectPointerType() 2436 && Old->getType()->isObjCObjectPointerType()) { 2437 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2438 Old->getType()); 2439 } 2440 } else { 2441 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2442 } 2443 if (MergedT.isNull()) { 2444 Diag(New->getLocation(), diag::err_redefinition_different_type) 2445 << New->getDeclName() << New->getType() << Old->getType(); 2446 Diag(Old->getLocation(), diag::note_previous_definition); 2447 return New->setInvalidDecl(); 2448 } 2449 New->setType(MergedT); 2450} 2451 2452/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2453/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2454/// situation, merging decls or emitting diagnostics as appropriate. 2455/// 2456/// Tentative definition rules (C99 6.9.2p2) are checked by 2457/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2458/// definitions here, since the initializer hasn't been attached. 2459/// 2460void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2461 // If the new decl is already invalid, don't do any other checking. 2462 if (New->isInvalidDecl()) 2463 return; 2464 2465 // Verify the old decl was also a variable. 2466 VarDecl *Old = 0; 2467 if (!Previous.isSingleResult() || 2468 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2469 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2470 << New->getDeclName(); 2471 Diag(Previous.getRepresentativeDecl()->getLocation(), 2472 diag::note_previous_definition); 2473 return New->setInvalidDecl(); 2474 } 2475 2476 // C++ [class.mem]p1: 2477 // A member shall not be declared twice in the member-specification [...] 2478 // 2479 // Here, we need only consider static data members. 2480 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2481 Diag(New->getLocation(), diag::err_duplicate_member) 2482 << New->getIdentifier(); 2483 Diag(Old->getLocation(), diag::note_previous_declaration); 2484 New->setInvalidDecl(); 2485 } 2486 2487 mergeDeclAttributes(New, Old); 2488 // Warn if an already-declared variable is made a weak_import in a subsequent 2489 // declaration 2490 if (New->getAttr<WeakImportAttr>() && 2491 Old->getStorageClass() == SC_None && 2492 !Old->getAttr<WeakImportAttr>()) { 2493 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2494 Diag(Old->getLocation(), diag::note_previous_definition); 2495 // Remove weak_import attribute on new declaration. 2496 New->dropAttr<WeakImportAttr>(); 2497 } 2498 2499 // Merge the types. 2500 MergeVarDeclTypes(New, Old); 2501 if (New->isInvalidDecl()) 2502 return; 2503 2504 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2505 if (New->getStorageClass() == SC_Static && 2506 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2507 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2508 Diag(Old->getLocation(), diag::note_previous_definition); 2509 return New->setInvalidDecl(); 2510 } 2511 // C99 6.2.2p4: 2512 // For an identifier declared with the storage-class specifier 2513 // extern in a scope in which a prior declaration of that 2514 // identifier is visible,23) if the prior declaration specifies 2515 // internal or external linkage, the linkage of the identifier at 2516 // the later declaration is the same as the linkage specified at 2517 // the prior declaration. If no prior declaration is visible, or 2518 // if the prior declaration specifies no linkage, then the 2519 // identifier has external linkage. 2520 if (New->hasExternalStorage() && Old->hasLinkage()) 2521 /* Okay */; 2522 else if (New->getStorageClass() != SC_Static && 2523 Old->getStorageClass() == SC_Static) { 2524 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2525 Diag(Old->getLocation(), diag::note_previous_definition); 2526 return New->setInvalidDecl(); 2527 } 2528 2529 // Check if extern is followed by non-extern and vice-versa. 2530 if (New->hasExternalStorage() && 2531 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2532 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2533 Diag(Old->getLocation(), diag::note_previous_definition); 2534 return New->setInvalidDecl(); 2535 } 2536 if (Old->hasExternalStorage() && 2537 !New->hasLinkage() && New->isLocalVarDecl()) { 2538 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2539 Diag(Old->getLocation(), diag::note_previous_definition); 2540 return New->setInvalidDecl(); 2541 } 2542 2543 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2544 2545 // FIXME: The test for external storage here seems wrong? We still 2546 // need to check for mismatches. 2547 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2548 // Don't complain about out-of-line definitions of static members. 2549 !(Old->getLexicalDeclContext()->isRecord() && 2550 !New->getLexicalDeclContext()->isRecord())) { 2551 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2552 Diag(Old->getLocation(), diag::note_previous_definition); 2553 return New->setInvalidDecl(); 2554 } 2555 2556 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2557 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2558 Diag(Old->getLocation(), diag::note_previous_definition); 2559 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2560 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2561 Diag(Old->getLocation(), diag::note_previous_definition); 2562 } 2563 2564 // C++ doesn't have tentative definitions, so go right ahead and check here. 2565 const VarDecl *Def; 2566 if (getLangOpts().CPlusPlus && 2567 New->isThisDeclarationADefinition() == VarDecl::Definition && 2568 (Def = Old->getDefinition())) { 2569 Diag(New->getLocation(), diag::err_redefinition) 2570 << New->getDeclName(); 2571 Diag(Def->getLocation(), diag::note_previous_definition); 2572 New->setInvalidDecl(); 2573 return; 2574 } 2575 // c99 6.2.2 P4. 2576 // For an identifier declared with the storage-class specifier extern in a 2577 // scope in which a prior declaration of that identifier is visible, if 2578 // the prior declaration specifies internal or external linkage, the linkage 2579 // of the identifier at the later declaration is the same as the linkage 2580 // specified at the prior declaration. 2581 // FIXME. revisit this code. 2582 if (New->hasExternalStorage() && 2583 Old->getLinkage() == InternalLinkage && 2584 New->getDeclContext() == Old->getDeclContext()) 2585 New->setStorageClass(Old->getStorageClass()); 2586 2587 // Keep a chain of previous declarations. 2588 New->setPreviousDeclaration(Old); 2589 2590 // Inherit access appropriately. 2591 New->setAccess(Old->getAccess()); 2592} 2593 2594/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2595/// no declarator (e.g. "struct foo;") is parsed. 2596Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2597 DeclSpec &DS) { 2598 return ParsedFreeStandingDeclSpec(S, AS, DS, MultiTemplateParamsArg()); 2599} 2600 2601/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2602/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2603/// parameters to cope with template friend declarations. 2604Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2605 DeclSpec &DS, 2606 MultiTemplateParamsArg TemplateParams) { 2607 Decl *TagD = 0; 2608 TagDecl *Tag = 0; 2609 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2610 DS.getTypeSpecType() == DeclSpec::TST_struct || 2611 DS.getTypeSpecType() == DeclSpec::TST_interface || 2612 DS.getTypeSpecType() == DeclSpec::TST_union || 2613 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2614 TagD = DS.getRepAsDecl(); 2615 2616 if (!TagD) // We probably had an error 2617 return 0; 2618 2619 // Note that the above type specs guarantee that the 2620 // type rep is a Decl, whereas in many of the others 2621 // it's a Type. 2622 if (isa<TagDecl>(TagD)) 2623 Tag = cast<TagDecl>(TagD); 2624 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2625 Tag = CTD->getTemplatedDecl(); 2626 } 2627 2628 if (Tag) { 2629 Tag->setFreeStanding(); 2630 if (Tag->isInvalidDecl()) 2631 return Tag; 2632 } 2633 2634 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2635 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2636 // or incomplete types shall not be restrict-qualified." 2637 if (TypeQuals & DeclSpec::TQ_restrict) 2638 Diag(DS.getRestrictSpecLoc(), 2639 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2640 << DS.getSourceRange(); 2641 } 2642 2643 if (DS.isConstexprSpecified()) { 2644 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2645 // and definitions of functions and variables. 2646 if (Tag) 2647 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2648 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2649 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2650 DS.getTypeSpecType() == DeclSpec::TST_interface ? 2 : 2651 DS.getTypeSpecType() == DeclSpec::TST_union ? 3 : 4); 2652 else 2653 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2654 // Don't emit warnings after this error. 2655 return TagD; 2656 } 2657 2658 if (DS.isFriendSpecified()) { 2659 // If we're dealing with a decl but not a TagDecl, assume that 2660 // whatever routines created it handled the friendship aspect. 2661 if (TagD && !Tag) 2662 return 0; 2663 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2664 } 2665 2666 // Track whether we warned about the fact that there aren't any 2667 // declarators. 2668 bool emittedWarning = false; 2669 2670 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2671 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2672 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2673 if (getLangOpts().CPlusPlus || 2674 Record->getDeclContext()->isRecord()) 2675 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2676 2677 Diag(DS.getLocStart(), diag::ext_no_declarators) 2678 << DS.getSourceRange(); 2679 emittedWarning = true; 2680 } 2681 } 2682 2683 // Check for Microsoft C extension: anonymous struct. 2684 if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus && 2685 CurContext->isRecord() && 2686 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2687 // Handle 2 kinds of anonymous struct: 2688 // struct STRUCT; 2689 // and 2690 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2691 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2692 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2693 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2694 DS.getRepAsType().get()->isStructureType())) { 2695 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct) 2696 << DS.getSourceRange(); 2697 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2698 } 2699 } 2700 2701 if (getLangOpts().CPlusPlus && 2702 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2703 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2704 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2705 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2706 Diag(Enum->getLocation(), diag::ext_no_declarators) 2707 << DS.getSourceRange(); 2708 emittedWarning = true; 2709 } 2710 2711 // Skip all the checks below if we have a type error. 2712 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2713 2714 if (!DS.isMissingDeclaratorOk()) { 2715 // Warn about typedefs of enums without names, since this is an 2716 // extension in both Microsoft and GNU. 2717 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2718 Tag && isa<EnumDecl>(Tag)) { 2719 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name) 2720 << DS.getSourceRange(); 2721 return Tag; 2722 } 2723 2724 Diag(DS.getLocStart(), diag::ext_no_declarators) 2725 << DS.getSourceRange(); 2726 emittedWarning = true; 2727 } 2728 2729 // We're going to complain about a bunch of spurious specifiers; 2730 // only do this if we're declaring a tag, because otherwise we 2731 // should be getting diag::ext_no_declarators. 2732 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2733 return TagD; 2734 2735 // Note that a linkage-specification sets a storage class, but 2736 // 'extern "C" struct foo;' is actually valid and not theoretically 2737 // useless. 2738 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2739 if (!DS.isExternInLinkageSpec()) 2740 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2741 << DeclSpec::getSpecifierName(scs); 2742 2743 if (DS.isThreadSpecified()) 2744 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2745 if (DS.getTypeQualifiers()) { 2746 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2747 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2748 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2749 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2750 // Restrict is covered above. 2751 } 2752 if (DS.isInlineSpecified()) 2753 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2754 if (DS.isVirtualSpecified()) 2755 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2756 if (DS.isExplicitSpecified()) 2757 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2758 2759 if (DS.isModulePrivateSpecified() && 2760 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2761 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2762 << Tag->getTagKind() 2763 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2764 2765 // Warn about ignored type attributes, for example: 2766 // __attribute__((aligned)) struct A; 2767 // Attributes should be placed after tag to apply to type declaration. 2768 if (!DS.getAttributes().empty()) { 2769 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2770 if (TypeSpecType == DeclSpec::TST_class || 2771 TypeSpecType == DeclSpec::TST_struct || 2772 TypeSpecType == DeclSpec::TST_interface || 2773 TypeSpecType == DeclSpec::TST_union || 2774 TypeSpecType == DeclSpec::TST_enum) { 2775 AttributeList* attrs = DS.getAttributes().getList(); 2776 while (attrs) { 2777 Diag(attrs->getScopeLoc(), 2778 diag::warn_declspec_attribute_ignored) 2779 << attrs->getName() 2780 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2781 TypeSpecType == DeclSpec::TST_struct ? 1 : 2782 TypeSpecType == DeclSpec::TST_union ? 2 : 2783 TypeSpecType == DeclSpec::TST_interface ? 3 : 4); 2784 attrs = attrs->getNext(); 2785 } 2786 } 2787 } 2788 2789 ActOnDocumentableDecl(TagD); 2790 2791 return TagD; 2792} 2793 2794/// We are trying to inject an anonymous member into the given scope; 2795/// check if there's an existing declaration that can't be overloaded. 2796/// 2797/// \return true if this is a forbidden redeclaration 2798static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2799 Scope *S, 2800 DeclContext *Owner, 2801 DeclarationName Name, 2802 SourceLocation NameLoc, 2803 unsigned diagnostic) { 2804 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2805 Sema::ForRedeclaration); 2806 if (!SemaRef.LookupName(R, S)) return false; 2807 2808 if (R.getAsSingle<TagDecl>()) 2809 return false; 2810 2811 // Pick a representative declaration. 2812 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2813 assert(PrevDecl && "Expected a non-null Decl"); 2814 2815 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2816 return false; 2817 2818 SemaRef.Diag(NameLoc, diagnostic) << Name; 2819 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2820 2821 return true; 2822} 2823 2824/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2825/// anonymous struct or union AnonRecord into the owning context Owner 2826/// and scope S. This routine will be invoked just after we realize 2827/// that an unnamed union or struct is actually an anonymous union or 2828/// struct, e.g., 2829/// 2830/// @code 2831/// union { 2832/// int i; 2833/// float f; 2834/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2835/// // f into the surrounding scope.x 2836/// @endcode 2837/// 2838/// This routine is recursive, injecting the names of nested anonymous 2839/// structs/unions into the owning context and scope as well. 2840static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2841 DeclContext *Owner, 2842 RecordDecl *AnonRecord, 2843 AccessSpecifier AS, 2844 SmallVector<NamedDecl*, 2> &Chaining, 2845 bool MSAnonStruct) { 2846 unsigned diagKind 2847 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2848 : diag::err_anonymous_struct_member_redecl; 2849 2850 bool Invalid = false; 2851 2852 // Look every FieldDecl and IndirectFieldDecl with a name. 2853 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2854 DEnd = AnonRecord->decls_end(); 2855 D != DEnd; ++D) { 2856 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2857 cast<NamedDecl>(*D)->getDeclName()) { 2858 ValueDecl *VD = cast<ValueDecl>(*D); 2859 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2860 VD->getLocation(), diagKind)) { 2861 // C++ [class.union]p2: 2862 // The names of the members of an anonymous union shall be 2863 // distinct from the names of any other entity in the 2864 // scope in which the anonymous union is declared. 2865 Invalid = true; 2866 } else { 2867 // C++ [class.union]p2: 2868 // For the purpose of name lookup, after the anonymous union 2869 // definition, the members of the anonymous union are 2870 // considered to have been defined in the scope in which the 2871 // anonymous union is declared. 2872 unsigned OldChainingSize = Chaining.size(); 2873 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2874 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2875 PE = IF->chain_end(); PI != PE; ++PI) 2876 Chaining.push_back(*PI); 2877 else 2878 Chaining.push_back(VD); 2879 2880 assert(Chaining.size() >= 2); 2881 NamedDecl **NamedChain = 2882 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2883 for (unsigned i = 0; i < Chaining.size(); i++) 2884 NamedChain[i] = Chaining[i]; 2885 2886 IndirectFieldDecl* IndirectField = 2887 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2888 VD->getIdentifier(), VD->getType(), 2889 NamedChain, Chaining.size()); 2890 2891 IndirectField->setAccess(AS); 2892 IndirectField->setImplicit(); 2893 SemaRef.PushOnScopeChains(IndirectField, S); 2894 2895 // That includes picking up the appropriate access specifier. 2896 if (AS != AS_none) IndirectField->setAccess(AS); 2897 2898 Chaining.resize(OldChainingSize); 2899 } 2900 } 2901 } 2902 2903 return Invalid; 2904} 2905 2906/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2907/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2908/// illegal input values are mapped to SC_None. 2909static StorageClass 2910StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2911 switch (StorageClassSpec) { 2912 case DeclSpec::SCS_unspecified: return SC_None; 2913 case DeclSpec::SCS_extern: return SC_Extern; 2914 case DeclSpec::SCS_static: return SC_Static; 2915 case DeclSpec::SCS_auto: return SC_Auto; 2916 case DeclSpec::SCS_register: return SC_Register; 2917 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2918 // Illegal SCSs map to None: error reporting is up to the caller. 2919 case DeclSpec::SCS_mutable: // Fall through. 2920 case DeclSpec::SCS_typedef: return SC_None; 2921 } 2922 llvm_unreachable("unknown storage class specifier"); 2923} 2924 2925/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2926/// a StorageClass. Any error reporting is up to the caller: 2927/// illegal input values are mapped to SC_None. 2928static StorageClass 2929StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2930 switch (StorageClassSpec) { 2931 case DeclSpec::SCS_unspecified: return SC_None; 2932 case DeclSpec::SCS_extern: return SC_Extern; 2933 case DeclSpec::SCS_static: return SC_Static; 2934 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2935 // Illegal SCSs map to None: error reporting is up to the caller. 2936 case DeclSpec::SCS_auto: // Fall through. 2937 case DeclSpec::SCS_mutable: // Fall through. 2938 case DeclSpec::SCS_register: // Fall through. 2939 case DeclSpec::SCS_typedef: return SC_None; 2940 } 2941 llvm_unreachable("unknown storage class specifier"); 2942} 2943 2944/// BuildAnonymousStructOrUnion - Handle the declaration of an 2945/// anonymous structure or union. Anonymous unions are a C++ feature 2946/// (C++ [class.union]) and a C11 feature; anonymous structures 2947/// are a C11 feature and GNU C++ extension. 2948Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2949 AccessSpecifier AS, 2950 RecordDecl *Record) { 2951 DeclContext *Owner = Record->getDeclContext(); 2952 2953 // Diagnose whether this anonymous struct/union is an extension. 2954 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11) 2955 Diag(Record->getLocation(), diag::ext_anonymous_union); 2956 else if (!Record->isUnion() && getLangOpts().CPlusPlus) 2957 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2958 else if (!Record->isUnion() && !getLangOpts().C11) 2959 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2960 2961 // C and C++ require different kinds of checks for anonymous 2962 // structs/unions. 2963 bool Invalid = false; 2964 if (getLangOpts().CPlusPlus) { 2965 const char* PrevSpec = 0; 2966 unsigned DiagID; 2967 if (Record->isUnion()) { 2968 // C++ [class.union]p6: 2969 // Anonymous unions declared in a named namespace or in the 2970 // global namespace shall be declared static. 2971 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2972 (isa<TranslationUnitDecl>(Owner) || 2973 (isa<NamespaceDecl>(Owner) && 2974 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2975 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2976 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2977 2978 // Recover by adding 'static'. 2979 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2980 PrevSpec, DiagID); 2981 } 2982 // C++ [class.union]p6: 2983 // A storage class is not allowed in a declaration of an 2984 // anonymous union in a class scope. 2985 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2986 isa<RecordDecl>(Owner)) { 2987 Diag(DS.getStorageClassSpecLoc(), 2988 diag::err_anonymous_union_with_storage_spec) 2989 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2990 2991 // Recover by removing the storage specifier. 2992 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2993 SourceLocation(), 2994 PrevSpec, DiagID); 2995 } 2996 } 2997 2998 // Ignore const/volatile/restrict qualifiers. 2999 if (DS.getTypeQualifiers()) { 3000 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 3001 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 3002 << Record->isUnion() << 0 3003 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 3004 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 3005 Diag(DS.getVolatileSpecLoc(), 3006 diag::ext_anonymous_struct_union_qualified) 3007 << Record->isUnion() << 1 3008 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 3009 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 3010 Diag(DS.getRestrictSpecLoc(), 3011 diag::ext_anonymous_struct_union_qualified) 3012 << Record->isUnion() << 2 3013 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 3014 3015 DS.ClearTypeQualifiers(); 3016 } 3017 3018 // C++ [class.union]p2: 3019 // The member-specification of an anonymous union shall only 3020 // define non-static data members. [Note: nested types and 3021 // functions cannot be declared within an anonymous union. ] 3022 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 3023 MemEnd = Record->decls_end(); 3024 Mem != MemEnd; ++Mem) { 3025 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 3026 // C++ [class.union]p3: 3027 // An anonymous union shall not have private or protected 3028 // members (clause 11). 3029 assert(FD->getAccess() != AS_none); 3030 if (FD->getAccess() != AS_public) { 3031 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 3032 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 3033 Invalid = true; 3034 } 3035 3036 // C++ [class.union]p1 3037 // An object of a class with a non-trivial constructor, a non-trivial 3038 // copy constructor, a non-trivial destructor, or a non-trivial copy 3039 // assignment operator cannot be a member of a union, nor can an 3040 // array of such objects. 3041 if (CheckNontrivialField(FD)) 3042 Invalid = true; 3043 } else if ((*Mem)->isImplicit()) { 3044 // Any implicit members are fine. 3045 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 3046 // This is a type that showed up in an 3047 // elaborated-type-specifier inside the anonymous struct or 3048 // union, but which actually declares a type outside of the 3049 // anonymous struct or union. It's okay. 3050 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 3051 if (!MemRecord->isAnonymousStructOrUnion() && 3052 MemRecord->getDeclName()) { 3053 // Visual C++ allows type definition in anonymous struct or union. 3054 if (getLangOpts().MicrosoftExt) 3055 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 3056 << (int)Record->isUnion(); 3057 else { 3058 // This is a nested type declaration. 3059 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 3060 << (int)Record->isUnion(); 3061 Invalid = true; 3062 } 3063 } 3064 } else if (isa<AccessSpecDecl>(*Mem)) { 3065 // Any access specifier is fine. 3066 } else { 3067 // We have something that isn't a non-static data 3068 // member. Complain about it. 3069 unsigned DK = diag::err_anonymous_record_bad_member; 3070 if (isa<TypeDecl>(*Mem)) 3071 DK = diag::err_anonymous_record_with_type; 3072 else if (isa<FunctionDecl>(*Mem)) 3073 DK = diag::err_anonymous_record_with_function; 3074 else if (isa<VarDecl>(*Mem)) 3075 DK = diag::err_anonymous_record_with_static; 3076 3077 // Visual C++ allows type definition in anonymous struct or union. 3078 if (getLangOpts().MicrosoftExt && 3079 DK == diag::err_anonymous_record_with_type) 3080 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 3081 << (int)Record->isUnion(); 3082 else { 3083 Diag((*Mem)->getLocation(), DK) 3084 << (int)Record->isUnion(); 3085 Invalid = true; 3086 } 3087 } 3088 } 3089 } 3090 3091 if (!Record->isUnion() && !Owner->isRecord()) { 3092 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 3093 << (int)getLangOpts().CPlusPlus; 3094 Invalid = true; 3095 } 3096 3097 // Mock up a declarator. 3098 Declarator Dc(DS, Declarator::MemberContext); 3099 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 3100 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 3101 3102 // Create a declaration for this anonymous struct/union. 3103 NamedDecl *Anon = 0; 3104 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 3105 Anon = FieldDecl::Create(Context, OwningClass, 3106 DS.getLocStart(), 3107 Record->getLocation(), 3108 /*IdentifierInfo=*/0, 3109 Context.getTypeDeclType(Record), 3110 TInfo, 3111 /*BitWidth=*/0, /*Mutable=*/false, 3112 /*InitStyle=*/ICIS_NoInit); 3113 Anon->setAccess(AS); 3114 if (getLangOpts().CPlusPlus) 3115 FieldCollector->Add(cast<FieldDecl>(Anon)); 3116 } else { 3117 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 3118 assert(SCSpec != DeclSpec::SCS_typedef && 3119 "Parser allowed 'typedef' as storage class VarDecl."); 3120 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3121 if (SCSpec == DeclSpec::SCS_mutable) { 3122 // mutable can only appear on non-static class members, so it's always 3123 // an error here 3124 Diag(Record->getLocation(), diag::err_mutable_nonmember); 3125 Invalid = true; 3126 SC = SC_None; 3127 } 3128 SCSpec = DS.getStorageClassSpecAsWritten(); 3129 VarDecl::StorageClass SCAsWritten 3130 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3131 3132 Anon = VarDecl::Create(Context, Owner, 3133 DS.getLocStart(), 3134 Record->getLocation(), /*IdentifierInfo=*/0, 3135 Context.getTypeDeclType(Record), 3136 TInfo, SC, SCAsWritten); 3137 3138 // Default-initialize the implicit variable. This initialization will be 3139 // trivial in almost all cases, except if a union member has an in-class 3140 // initializer: 3141 // union { int n = 0; }; 3142 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 3143 } 3144 Anon->setImplicit(); 3145 3146 // Add the anonymous struct/union object to the current 3147 // context. We'll be referencing this object when we refer to one of 3148 // its members. 3149 Owner->addDecl(Anon); 3150 3151 // Inject the members of the anonymous struct/union into the owning 3152 // context and into the identifier resolver chain for name lookup 3153 // purposes. 3154 SmallVector<NamedDecl*, 2> Chain; 3155 Chain.push_back(Anon); 3156 3157 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 3158 Chain, false)) 3159 Invalid = true; 3160 3161 // Mark this as an anonymous struct/union type. Note that we do not 3162 // do this until after we have already checked and injected the 3163 // members of this anonymous struct/union type, because otherwise 3164 // the members could be injected twice: once by DeclContext when it 3165 // builds its lookup table, and once by 3166 // InjectAnonymousStructOrUnionMembers. 3167 Record->setAnonymousStructOrUnion(true); 3168 3169 if (Invalid) 3170 Anon->setInvalidDecl(); 3171 3172 return Anon; 3173} 3174 3175/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 3176/// Microsoft C anonymous structure. 3177/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 3178/// Example: 3179/// 3180/// struct A { int a; }; 3181/// struct B { struct A; int b; }; 3182/// 3183/// void foo() { 3184/// B var; 3185/// var.a = 3; 3186/// } 3187/// 3188Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 3189 RecordDecl *Record) { 3190 3191 // If there is no Record, get the record via the typedef. 3192 if (!Record) 3193 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 3194 3195 // Mock up a declarator. 3196 Declarator Dc(DS, Declarator::TypeNameContext); 3197 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 3198 assert(TInfo && "couldn't build declarator info for anonymous struct"); 3199 3200 // Create a declaration for this anonymous struct. 3201 NamedDecl* Anon = FieldDecl::Create(Context, 3202 cast<RecordDecl>(CurContext), 3203 DS.getLocStart(), 3204 DS.getLocStart(), 3205 /*IdentifierInfo=*/0, 3206 Context.getTypeDeclType(Record), 3207 TInfo, 3208 /*BitWidth=*/0, /*Mutable=*/false, 3209 /*InitStyle=*/ICIS_NoInit); 3210 Anon->setImplicit(); 3211 3212 // Add the anonymous struct object to the current context. 3213 CurContext->addDecl(Anon); 3214 3215 // Inject the members of the anonymous struct into the current 3216 // context and into the identifier resolver chain for name lookup 3217 // purposes. 3218 SmallVector<NamedDecl*, 2> Chain; 3219 Chain.push_back(Anon); 3220 3221 RecordDecl *RecordDef = Record->getDefinition(); 3222 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 3223 RecordDef, AS_none, 3224 Chain, true)) 3225 Anon->setInvalidDecl(); 3226 3227 return Anon; 3228} 3229 3230/// GetNameForDeclarator - Determine the full declaration name for the 3231/// given Declarator. 3232DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 3233 return GetNameFromUnqualifiedId(D.getName()); 3234} 3235 3236/// \brief Retrieves the declaration name from a parsed unqualified-id. 3237DeclarationNameInfo 3238Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 3239 DeclarationNameInfo NameInfo; 3240 NameInfo.setLoc(Name.StartLocation); 3241 3242 switch (Name.getKind()) { 3243 3244 case UnqualifiedId::IK_ImplicitSelfParam: 3245 case UnqualifiedId::IK_Identifier: 3246 NameInfo.setName(Name.Identifier); 3247 NameInfo.setLoc(Name.StartLocation); 3248 return NameInfo; 3249 3250 case UnqualifiedId::IK_OperatorFunctionId: 3251 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 3252 Name.OperatorFunctionId.Operator)); 3253 NameInfo.setLoc(Name.StartLocation); 3254 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 3255 = Name.OperatorFunctionId.SymbolLocations[0]; 3256 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 3257 = Name.EndLocation.getRawEncoding(); 3258 return NameInfo; 3259 3260 case UnqualifiedId::IK_LiteralOperatorId: 3261 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 3262 Name.Identifier)); 3263 NameInfo.setLoc(Name.StartLocation); 3264 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3265 return NameInfo; 3266 3267 case UnqualifiedId::IK_ConversionFunctionId: { 3268 TypeSourceInfo *TInfo; 3269 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3270 if (Ty.isNull()) 3271 return DeclarationNameInfo(); 3272 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3273 Context.getCanonicalType(Ty))); 3274 NameInfo.setLoc(Name.StartLocation); 3275 NameInfo.setNamedTypeInfo(TInfo); 3276 return NameInfo; 3277 } 3278 3279 case UnqualifiedId::IK_ConstructorName: { 3280 TypeSourceInfo *TInfo; 3281 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3282 if (Ty.isNull()) 3283 return DeclarationNameInfo(); 3284 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3285 Context.getCanonicalType(Ty))); 3286 NameInfo.setLoc(Name.StartLocation); 3287 NameInfo.setNamedTypeInfo(TInfo); 3288 return NameInfo; 3289 } 3290 3291 case UnqualifiedId::IK_ConstructorTemplateId: { 3292 // In well-formed code, we can only have a constructor 3293 // template-id that refers to the current context, so go there 3294 // to find the actual type being constructed. 3295 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3296 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3297 return DeclarationNameInfo(); 3298 3299 // Determine the type of the class being constructed. 3300 QualType CurClassType = Context.getTypeDeclType(CurClass); 3301 3302 // FIXME: Check two things: that the template-id names the same type as 3303 // CurClassType, and that the template-id does not occur when the name 3304 // was qualified. 3305 3306 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3307 Context.getCanonicalType(CurClassType))); 3308 NameInfo.setLoc(Name.StartLocation); 3309 // FIXME: should we retrieve TypeSourceInfo? 3310 NameInfo.setNamedTypeInfo(0); 3311 return NameInfo; 3312 } 3313 3314 case UnqualifiedId::IK_DestructorName: { 3315 TypeSourceInfo *TInfo; 3316 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3317 if (Ty.isNull()) 3318 return DeclarationNameInfo(); 3319 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3320 Context.getCanonicalType(Ty))); 3321 NameInfo.setLoc(Name.StartLocation); 3322 NameInfo.setNamedTypeInfo(TInfo); 3323 return NameInfo; 3324 } 3325 3326 case UnqualifiedId::IK_TemplateId: { 3327 TemplateName TName = Name.TemplateId->Template.get(); 3328 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3329 return Context.getNameForTemplate(TName, TNameLoc); 3330 } 3331 3332 } // switch (Name.getKind()) 3333 3334 llvm_unreachable("Unknown name kind"); 3335} 3336 3337static QualType getCoreType(QualType Ty) { 3338 do { 3339 if (Ty->isPointerType() || Ty->isReferenceType()) 3340 Ty = Ty->getPointeeType(); 3341 else if (Ty->isArrayType()) 3342 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3343 else 3344 return Ty.withoutLocalFastQualifiers(); 3345 } while (true); 3346} 3347 3348/// hasSimilarParameters - Determine whether the C++ functions Declaration 3349/// and Definition have "nearly" matching parameters. This heuristic is 3350/// used to improve diagnostics in the case where an out-of-line function 3351/// definition doesn't match any declaration within the class or namespace. 3352/// Also sets Params to the list of indices to the parameters that differ 3353/// between the declaration and the definition. If hasSimilarParameters 3354/// returns true and Params is empty, then all of the parameters match. 3355static bool hasSimilarParameters(ASTContext &Context, 3356 FunctionDecl *Declaration, 3357 FunctionDecl *Definition, 3358 llvm::SmallVectorImpl<unsigned> &Params) { 3359 Params.clear(); 3360 if (Declaration->param_size() != Definition->param_size()) 3361 return false; 3362 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3363 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3364 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3365 3366 // The parameter types are identical 3367 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3368 continue; 3369 3370 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3371 QualType DefParamBaseTy = getCoreType(DefParamTy); 3372 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3373 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3374 3375 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3376 (DeclTyName && DeclTyName == DefTyName)) 3377 Params.push_back(Idx); 3378 else // The two parameters aren't even close 3379 return false; 3380 } 3381 3382 return true; 3383} 3384 3385/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3386/// declarator needs to be rebuilt in the current instantiation. 3387/// Any bits of declarator which appear before the name are valid for 3388/// consideration here. That's specifically the type in the decl spec 3389/// and the base type in any member-pointer chunks. 3390static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3391 DeclarationName Name) { 3392 // The types we specifically need to rebuild are: 3393 // - typenames, typeofs, and decltypes 3394 // - types which will become injected class names 3395 // Of course, we also need to rebuild any type referencing such a 3396 // type. It's safest to just say "dependent", but we call out a 3397 // few cases here. 3398 3399 DeclSpec &DS = D.getMutableDeclSpec(); 3400 switch (DS.getTypeSpecType()) { 3401 case DeclSpec::TST_typename: 3402 case DeclSpec::TST_typeofType: 3403 case DeclSpec::TST_underlyingType: 3404 case DeclSpec::TST_atomic: { 3405 // Grab the type from the parser. 3406 TypeSourceInfo *TSI = 0; 3407 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3408 if (T.isNull() || !T->isDependentType()) break; 3409 3410 // Make sure there's a type source info. This isn't really much 3411 // of a waste; most dependent types should have type source info 3412 // attached already. 3413 if (!TSI) 3414 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3415 3416 // Rebuild the type in the current instantiation. 3417 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3418 if (!TSI) return true; 3419 3420 // Store the new type back in the decl spec. 3421 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3422 DS.UpdateTypeRep(LocType); 3423 break; 3424 } 3425 3426 case DeclSpec::TST_decltype: 3427 case DeclSpec::TST_typeofExpr: { 3428 Expr *E = DS.getRepAsExpr(); 3429 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3430 if (Result.isInvalid()) return true; 3431 DS.UpdateExprRep(Result.get()); 3432 break; 3433 } 3434 3435 default: 3436 // Nothing to do for these decl specs. 3437 break; 3438 } 3439 3440 // It doesn't matter what order we do this in. 3441 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3442 DeclaratorChunk &Chunk = D.getTypeObject(I); 3443 3444 // The only type information in the declarator which can come 3445 // before the declaration name is the base type of a member 3446 // pointer. 3447 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3448 continue; 3449 3450 // Rebuild the scope specifier in-place. 3451 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3452 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3453 return true; 3454 } 3455 3456 return false; 3457} 3458 3459Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3460 D.setFunctionDefinitionKind(FDK_Declaration); 3461 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg()); 3462 3463 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3464 Dcl && Dcl->getDeclContext()->isFileContext()) 3465 Dcl->setTopLevelDeclInObjCContainer(); 3466 3467 return Dcl; 3468} 3469 3470/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3471/// If T is the name of a class, then each of the following shall have a 3472/// name different from T: 3473/// - every static data member of class T; 3474/// - every member function of class T 3475/// - every member of class T that is itself a type; 3476/// \returns true if the declaration name violates these rules. 3477bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3478 DeclarationNameInfo NameInfo) { 3479 DeclarationName Name = NameInfo.getName(); 3480 3481 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3482 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3483 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3484 return true; 3485 } 3486 3487 return false; 3488} 3489 3490/// \brief Diagnose a declaration whose declarator-id has the given 3491/// nested-name-specifier. 3492/// 3493/// \param SS The nested-name-specifier of the declarator-id. 3494/// 3495/// \param DC The declaration context to which the nested-name-specifier 3496/// resolves. 3497/// 3498/// \param Name The name of the entity being declared. 3499/// 3500/// \param Loc The location of the name of the entity being declared. 3501/// 3502/// \returns true if we cannot safely recover from this error, false otherwise. 3503bool Sema::diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC, 3504 DeclarationName Name, 3505 SourceLocation Loc) { 3506 DeclContext *Cur = CurContext; 3507 while (isa<LinkageSpecDecl>(Cur)) 3508 Cur = Cur->getParent(); 3509 3510 // C++ [dcl.meaning]p1: 3511 // A declarator-id shall not be qualified except for the definition 3512 // of a member function (9.3) or static data member (9.4) outside of 3513 // its class, the definition or explicit instantiation of a function 3514 // or variable member of a namespace outside of its namespace, or the 3515 // definition of an explicit specialization outside of its namespace, 3516 // or the declaration of a friend function that is a member of 3517 // another class or namespace (11.3). [...] 3518 3519 // The user provided a superfluous scope specifier that refers back to the 3520 // class or namespaces in which the entity is already declared. 3521 // 3522 // class X { 3523 // void X::f(); 3524 // }; 3525 if (Cur->Equals(DC)) { 3526 Diag(Loc, LangOpts.MicrosoftExt? diag::warn_member_extra_qualification 3527 : diag::err_member_extra_qualification) 3528 << Name << FixItHint::CreateRemoval(SS.getRange()); 3529 SS.clear(); 3530 return false; 3531 } 3532 3533 // Check whether the qualifying scope encloses the scope of the original 3534 // declaration. 3535 if (!Cur->Encloses(DC)) { 3536 if (Cur->isRecord()) 3537 Diag(Loc, diag::err_member_qualification) 3538 << Name << SS.getRange(); 3539 else if (isa<TranslationUnitDecl>(DC)) 3540 Diag(Loc, diag::err_invalid_declarator_global_scope) 3541 << Name << SS.getRange(); 3542 else if (isa<FunctionDecl>(Cur)) 3543 Diag(Loc, diag::err_invalid_declarator_in_function) 3544 << Name << SS.getRange(); 3545 else 3546 Diag(Loc, diag::err_invalid_declarator_scope) 3547 << Name << cast<NamedDecl>(Cur) << cast<NamedDecl>(DC) << SS.getRange(); 3548 3549 return true; 3550 } 3551 3552 if (Cur->isRecord()) { 3553 // Cannot qualify members within a class. 3554 Diag(Loc, diag::err_member_qualification) 3555 << Name << SS.getRange(); 3556 SS.clear(); 3557 3558 // C++ constructors and destructors with incorrect scopes can break 3559 // our AST invariants by having the wrong underlying types. If 3560 // that's the case, then drop this declaration entirely. 3561 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3562 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3563 !Context.hasSameType(Name.getCXXNameType(), 3564 Context.getTypeDeclType(cast<CXXRecordDecl>(Cur)))) 3565 return true; 3566 3567 return false; 3568 } 3569 3570 // C++11 [dcl.meaning]p1: 3571 // [...] "The nested-name-specifier of the qualified declarator-id shall 3572 // not begin with a decltype-specifer" 3573 NestedNameSpecifierLoc SpecLoc(SS.getScopeRep(), SS.location_data()); 3574 while (SpecLoc.getPrefix()) 3575 SpecLoc = SpecLoc.getPrefix(); 3576 if (dyn_cast_or_null<DecltypeType>( 3577 SpecLoc.getNestedNameSpecifier()->getAsType())) 3578 Diag(Loc, diag::err_decltype_in_declarator) 3579 << SpecLoc.getTypeLoc().getSourceRange(); 3580 3581 return false; 3582} 3583 3584Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3585 MultiTemplateParamsArg TemplateParamLists) { 3586 // TODO: consider using NameInfo for diagnostic. 3587 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3588 DeclarationName Name = NameInfo.getName(); 3589 3590 // All of these full declarators require an identifier. If it doesn't have 3591 // one, the ParsedFreeStandingDeclSpec action should be used. 3592 if (!Name) { 3593 if (!D.isInvalidType()) // Reject this if we think it is valid. 3594 Diag(D.getDeclSpec().getLocStart(), 3595 diag::err_declarator_need_ident) 3596 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3597 return 0; 3598 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3599 return 0; 3600 3601 // The scope passed in may not be a decl scope. Zip up the scope tree until 3602 // we find one that is. 3603 while ((S->getFlags() & Scope::DeclScope) == 0 || 3604 (S->getFlags() & Scope::TemplateParamScope) != 0) 3605 S = S->getParent(); 3606 3607 DeclContext *DC = CurContext; 3608 if (D.getCXXScopeSpec().isInvalid()) 3609 D.setInvalidType(); 3610 else if (D.getCXXScopeSpec().isSet()) { 3611 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3612 UPPC_DeclarationQualifier)) 3613 return 0; 3614 3615 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3616 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3617 if (!DC) { 3618 // If we could not compute the declaration context, it's because the 3619 // declaration context is dependent but does not refer to a class, 3620 // class template, or class template partial specialization. Complain 3621 // and return early, to avoid the coming semantic disaster. 3622 Diag(D.getIdentifierLoc(), 3623 diag::err_template_qualified_declarator_no_match) 3624 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3625 << D.getCXXScopeSpec().getRange(); 3626 return 0; 3627 } 3628 bool IsDependentContext = DC->isDependentContext(); 3629 3630 if (!IsDependentContext && 3631 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3632 return 0; 3633 3634 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 3635 Diag(D.getIdentifierLoc(), 3636 diag::err_member_def_undefined_record) 3637 << Name << DC << D.getCXXScopeSpec().getRange(); 3638 D.setInvalidType(); 3639 } else if (!D.getDeclSpec().isFriendSpecified()) { 3640 if (diagnoseQualifiedDeclaration(D.getCXXScopeSpec(), DC, 3641 Name, D.getIdentifierLoc())) { 3642 if (DC->isRecord()) 3643 return 0; 3644 3645 D.setInvalidType(); 3646 } 3647 } 3648 3649 // Check whether we need to rebuild the type of the given 3650 // declaration in the current instantiation. 3651 if (EnteringContext && IsDependentContext && 3652 TemplateParamLists.size() != 0) { 3653 ContextRAII SavedContext(*this, DC); 3654 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3655 D.setInvalidType(); 3656 } 3657 } 3658 3659 if (DiagnoseClassNameShadow(DC, NameInfo)) 3660 // If this is a typedef, we'll end up spewing multiple diagnostics. 3661 // Just return early; it's safer. 3662 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3663 return 0; 3664 3665 NamedDecl *New; 3666 3667 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3668 QualType R = TInfo->getType(); 3669 3670 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3671 UPPC_DeclarationType)) 3672 D.setInvalidType(); 3673 3674 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3675 ForRedeclaration); 3676 3677 // See if this is a redefinition of a variable in the same scope. 3678 if (!D.getCXXScopeSpec().isSet()) { 3679 bool IsLinkageLookup = false; 3680 3681 // If the declaration we're planning to build will be a function 3682 // or object with linkage, then look for another declaration with 3683 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3684 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3685 /* Do nothing*/; 3686 else if (R->isFunctionType()) { 3687 if (CurContext->isFunctionOrMethod() || 3688 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3689 IsLinkageLookup = true; 3690 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3691 IsLinkageLookup = true; 3692 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3693 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3694 IsLinkageLookup = true; 3695 3696 if (IsLinkageLookup) 3697 Previous.clear(LookupRedeclarationWithLinkage); 3698 3699 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3700 } else { // Something like "int foo::x;" 3701 LookupQualifiedName(Previous, DC); 3702 3703 // C++ [dcl.meaning]p1: 3704 // When the declarator-id is qualified, the declaration shall refer to a 3705 // previously declared member of the class or namespace to which the 3706 // qualifier refers (or, in the case of a namespace, of an element of the 3707 // inline namespace set of that namespace (7.3.1)) or to a specialization 3708 // thereof; [...] 3709 // 3710 // Note that we already checked the context above, and that we do not have 3711 // enough information to make sure that Previous contains the declaration 3712 // we want to match. For example, given: 3713 // 3714 // class X { 3715 // void f(); 3716 // void f(float); 3717 // }; 3718 // 3719 // void X::f(int) { } // ill-formed 3720 // 3721 // In this case, Previous will point to the overload set 3722 // containing the two f's declared in X, but neither of them 3723 // matches. 3724 3725 // C++ [dcl.meaning]p1: 3726 // [...] the member shall not merely have been introduced by a 3727 // using-declaration in the scope of the class or namespace nominated by 3728 // the nested-name-specifier of the declarator-id. 3729 RemoveUsingDecls(Previous); 3730 } 3731 3732 if (Previous.isSingleResult() && 3733 Previous.getFoundDecl()->isTemplateParameter()) { 3734 // Maybe we will complain about the shadowed template parameter. 3735 if (!D.isInvalidType()) 3736 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3737 Previous.getFoundDecl()); 3738 3739 // Just pretend that we didn't see the previous declaration. 3740 Previous.clear(); 3741 } 3742 3743 // In C++, the previous declaration we find might be a tag type 3744 // (class or enum). In this case, the new declaration will hide the 3745 // tag type. Note that this does does not apply if we're declaring a 3746 // typedef (C++ [dcl.typedef]p4). 3747 if (Previous.isSingleTagDecl() && 3748 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3749 Previous.clear(); 3750 3751 bool AddToScope = true; 3752 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3753 if (TemplateParamLists.size()) { 3754 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3755 return 0; 3756 } 3757 3758 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3759 } else if (R->isFunctionType()) { 3760 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3761 TemplateParamLists, 3762 AddToScope); 3763 } else { 3764 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3765 TemplateParamLists); 3766 } 3767 3768 if (New == 0) 3769 return 0; 3770 3771 // If this has an identifier and is not an invalid redeclaration or 3772 // function template specialization, add it to the scope stack. 3773 if (New->getDeclName() && AddToScope && 3774 !(D.isRedeclaration() && New->isInvalidDecl())) 3775 PushOnScopeChains(New, S); 3776 3777 return New; 3778} 3779 3780/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3781/// types into constant array types in certain situations which would otherwise 3782/// be errors (for GCC compatibility). 3783static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3784 ASTContext &Context, 3785 bool &SizeIsNegative, 3786 llvm::APSInt &Oversized) { 3787 // This method tries to turn a variable array into a constant 3788 // array even when the size isn't an ICE. This is necessary 3789 // for compatibility with code that depends on gcc's buggy 3790 // constant expression folding, like struct {char x[(int)(char*)2];} 3791 SizeIsNegative = false; 3792 Oversized = 0; 3793 3794 if (T->isDependentType()) 3795 return QualType(); 3796 3797 QualifierCollector Qs; 3798 const Type *Ty = Qs.strip(T); 3799 3800 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3801 QualType Pointee = PTy->getPointeeType(); 3802 QualType FixedType = 3803 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3804 Oversized); 3805 if (FixedType.isNull()) return FixedType; 3806 FixedType = Context.getPointerType(FixedType); 3807 return Qs.apply(Context, FixedType); 3808 } 3809 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3810 QualType Inner = PTy->getInnerType(); 3811 QualType FixedType = 3812 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3813 Oversized); 3814 if (FixedType.isNull()) return FixedType; 3815 FixedType = Context.getParenType(FixedType); 3816 return Qs.apply(Context, FixedType); 3817 } 3818 3819 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3820 if (!VLATy) 3821 return QualType(); 3822 // FIXME: We should probably handle this case 3823 if (VLATy->getElementType()->isVariablyModifiedType()) 3824 return QualType(); 3825 3826 llvm::APSInt Res; 3827 if (!VLATy->getSizeExpr() || 3828 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3829 return QualType(); 3830 3831 // Check whether the array size is negative. 3832 if (Res.isSigned() && Res.isNegative()) { 3833 SizeIsNegative = true; 3834 return QualType(); 3835 } 3836 3837 // Check whether the array is too large to be addressed. 3838 unsigned ActiveSizeBits 3839 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3840 Res); 3841 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3842 Oversized = Res; 3843 return QualType(); 3844 } 3845 3846 return Context.getConstantArrayType(VLATy->getElementType(), 3847 Res, ArrayType::Normal, 0); 3848} 3849 3850/// \brief Register the given locally-scoped external C declaration so 3851/// that it can be found later for redeclarations 3852void 3853Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3854 const LookupResult &Previous, 3855 Scope *S) { 3856 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3857 "Decl is not a locally-scoped decl!"); 3858 // Note that we have a locally-scoped external with this name. 3859 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3860 3861 if (!Previous.isSingleResult()) 3862 return; 3863 3864 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3865 3866 // If there was a previous declaration of this variable, it may be 3867 // in our identifier chain. Update the identifier chain with the new 3868 // declaration. 3869 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3870 // The previous declaration was found on the identifer resolver 3871 // chain, so remove it from its scope. 3872 3873 if (S->isDeclScope(PrevDecl)) { 3874 // Special case for redeclarations in the SAME scope. 3875 // Because this declaration is going to be added to the identifier chain 3876 // later, we should temporarily take it OFF the chain. 3877 IdResolver.RemoveDecl(ND); 3878 3879 } else { 3880 // Find the scope for the original declaration. 3881 while (S && !S->isDeclScope(PrevDecl)) 3882 S = S->getParent(); 3883 } 3884 3885 if (S) 3886 S->RemoveDecl(PrevDecl); 3887 } 3888} 3889 3890llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3891Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3892 if (ExternalSource) { 3893 // Load locally-scoped external decls from the external source. 3894 SmallVector<NamedDecl *, 4> Decls; 3895 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3896 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3897 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3898 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3899 if (Pos == LocallyScopedExternalDecls.end()) 3900 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3901 } 3902 } 3903 3904 return LocallyScopedExternalDecls.find(Name); 3905} 3906 3907/// \brief Diagnose function specifiers on a declaration of an identifier that 3908/// does not identify a function. 3909void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3910 // FIXME: We should probably indicate the identifier in question to avoid 3911 // confusion for constructs like "inline int a(), b;" 3912 if (D.getDeclSpec().isInlineSpecified()) 3913 Diag(D.getDeclSpec().getInlineSpecLoc(), 3914 diag::err_inline_non_function); 3915 3916 if (D.getDeclSpec().isVirtualSpecified()) 3917 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3918 diag::err_virtual_non_function); 3919 3920 if (D.getDeclSpec().isExplicitSpecified()) 3921 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3922 diag::err_explicit_non_function); 3923} 3924 3925NamedDecl* 3926Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3927 TypeSourceInfo *TInfo, LookupResult &Previous) { 3928 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3929 if (D.getCXXScopeSpec().isSet()) { 3930 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3931 << D.getCXXScopeSpec().getRange(); 3932 D.setInvalidType(); 3933 // Pretend we didn't see the scope specifier. 3934 DC = CurContext; 3935 Previous.clear(); 3936 } 3937 3938 if (getLangOpts().CPlusPlus) { 3939 // Check that there are no default arguments (C++ only). 3940 CheckExtraCXXDefaultArguments(D); 3941 } 3942 3943 DiagnoseFunctionSpecifiers(D); 3944 3945 if (D.getDeclSpec().isThreadSpecified()) 3946 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3947 if (D.getDeclSpec().isConstexprSpecified()) 3948 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3949 << 1; 3950 3951 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3952 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3953 << D.getName().getSourceRange(); 3954 return 0; 3955 } 3956 3957 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3958 if (!NewTD) return 0; 3959 3960 // Handle attributes prior to checking for duplicates in MergeVarDecl 3961 ProcessDeclAttributes(S, NewTD, D); 3962 3963 CheckTypedefForVariablyModifiedType(S, NewTD); 3964 3965 bool Redeclaration = D.isRedeclaration(); 3966 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3967 D.setRedeclaration(Redeclaration); 3968 return ND; 3969} 3970 3971void 3972Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3973 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3974 // then it shall have block scope. 3975 // Note that variably modified types must be fixed before merging the decl so 3976 // that redeclarations will match. 3977 QualType T = NewTD->getUnderlyingType(); 3978 if (T->isVariablyModifiedType()) { 3979 getCurFunction()->setHasBranchProtectedScope(); 3980 3981 if (S->getFnParent() == 0) { 3982 bool SizeIsNegative; 3983 llvm::APSInt Oversized; 3984 QualType FixedTy = 3985 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3986 Oversized); 3987 if (!FixedTy.isNull()) { 3988 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3989 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3990 } else { 3991 if (SizeIsNegative) 3992 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3993 else if (T->isVariableArrayType()) 3994 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3995 else if (Oversized.getBoolValue()) 3996 Diag(NewTD->getLocation(), diag::err_array_too_large) 3997 << Oversized.toString(10); 3998 else 3999 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 4000 NewTD->setInvalidDecl(); 4001 } 4002 } 4003 } 4004} 4005 4006 4007/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 4008/// declares a typedef-name, either using the 'typedef' type specifier or via 4009/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 4010NamedDecl* 4011Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 4012 LookupResult &Previous, bool &Redeclaration) { 4013 // Merge the decl with the existing one if appropriate. If the decl is 4014 // in an outer scope, it isn't the same thing. 4015 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 4016 /*ExplicitInstantiationOrSpecialization=*/false); 4017 if (!Previous.empty()) { 4018 Redeclaration = true; 4019 MergeTypedefNameDecl(NewTD, Previous); 4020 } 4021 4022 // If this is the C FILE type, notify the AST context. 4023 if (IdentifierInfo *II = NewTD->getIdentifier()) 4024 if (!NewTD->isInvalidDecl() && 4025 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 4026 if (II->isStr("FILE")) 4027 Context.setFILEDecl(NewTD); 4028 else if (II->isStr("jmp_buf")) 4029 Context.setjmp_bufDecl(NewTD); 4030 else if (II->isStr("sigjmp_buf")) 4031 Context.setsigjmp_bufDecl(NewTD); 4032 else if (II->isStr("ucontext_t")) 4033 Context.setucontext_tDecl(NewTD); 4034 } 4035 4036 return NewTD; 4037} 4038 4039/// \brief Determines whether the given declaration is an out-of-scope 4040/// previous declaration. 4041/// 4042/// This routine should be invoked when name lookup has found a 4043/// previous declaration (PrevDecl) that is not in the scope where a 4044/// new declaration by the same name is being introduced. If the new 4045/// declaration occurs in a local scope, previous declarations with 4046/// linkage may still be considered previous declarations (C99 4047/// 6.2.2p4-5, C++ [basic.link]p6). 4048/// 4049/// \param PrevDecl the previous declaration found by name 4050/// lookup 4051/// 4052/// \param DC the context in which the new declaration is being 4053/// declared. 4054/// 4055/// \returns true if PrevDecl is an out-of-scope previous declaration 4056/// for a new delcaration with the same name. 4057static bool 4058isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 4059 ASTContext &Context) { 4060 if (!PrevDecl) 4061 return false; 4062 4063 if (!PrevDecl->hasLinkage()) 4064 return false; 4065 4066 if (Context.getLangOpts().CPlusPlus) { 4067 // C++ [basic.link]p6: 4068 // If there is a visible declaration of an entity with linkage 4069 // having the same name and type, ignoring entities declared 4070 // outside the innermost enclosing namespace scope, the block 4071 // scope declaration declares that same entity and receives the 4072 // linkage of the previous declaration. 4073 DeclContext *OuterContext = DC->getRedeclContext(); 4074 if (!OuterContext->isFunctionOrMethod()) 4075 // This rule only applies to block-scope declarations. 4076 return false; 4077 4078 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 4079 if (PrevOuterContext->isRecord()) 4080 // We found a member function: ignore it. 4081 return false; 4082 4083 // Find the innermost enclosing namespace for the new and 4084 // previous declarations. 4085 OuterContext = OuterContext->getEnclosingNamespaceContext(); 4086 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 4087 4088 // The previous declaration is in a different namespace, so it 4089 // isn't the same function. 4090 if (!OuterContext->Equals(PrevOuterContext)) 4091 return false; 4092 } 4093 4094 return true; 4095} 4096 4097static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 4098 CXXScopeSpec &SS = D.getCXXScopeSpec(); 4099 if (!SS.isSet()) return; 4100 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 4101} 4102 4103bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 4104 QualType type = decl->getType(); 4105 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 4106 if (lifetime == Qualifiers::OCL_Autoreleasing) { 4107 // Various kinds of declaration aren't allowed to be __autoreleasing. 4108 unsigned kind = -1U; 4109 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 4110 if (var->hasAttr<BlocksAttr>()) 4111 kind = 0; // __block 4112 else if (!var->hasLocalStorage()) 4113 kind = 1; // global 4114 } else if (isa<ObjCIvarDecl>(decl)) { 4115 kind = 3; // ivar 4116 } else if (isa<FieldDecl>(decl)) { 4117 kind = 2; // field 4118 } 4119 4120 if (kind != -1U) { 4121 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 4122 << kind; 4123 } 4124 } else if (lifetime == Qualifiers::OCL_None) { 4125 // Try to infer lifetime. 4126 if (!type->isObjCLifetimeType()) 4127 return false; 4128 4129 lifetime = type->getObjCARCImplicitLifetime(); 4130 type = Context.getLifetimeQualifiedType(type, lifetime); 4131 decl->setType(type); 4132 } 4133 4134 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 4135 // Thread-local variables cannot have lifetime. 4136 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 4137 var->isThreadSpecified()) { 4138 Diag(var->getLocation(), diag::err_arc_thread_ownership) 4139 << var->getType(); 4140 return true; 4141 } 4142 } 4143 4144 return false; 4145} 4146 4147NamedDecl* 4148Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4149 TypeSourceInfo *TInfo, LookupResult &Previous, 4150 MultiTemplateParamsArg TemplateParamLists) { 4151 QualType R = TInfo->getType(); 4152 DeclarationName Name = GetNameForDeclarator(D).getName(); 4153 4154 // Check that there are no default arguments (C++ only). 4155 if (getLangOpts().CPlusPlus) 4156 CheckExtraCXXDefaultArguments(D); 4157 4158 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 4159 assert(SCSpec != DeclSpec::SCS_typedef && 4160 "Parser allowed 'typedef' as storage class VarDecl."); 4161 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 4162 if (SCSpec == DeclSpec::SCS_mutable) { 4163 // mutable can only appear on non-static class members, so it's always 4164 // an error here 4165 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 4166 D.setInvalidType(); 4167 SC = SC_None; 4168 } 4169 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4170 VarDecl::StorageClass SCAsWritten 4171 = StorageClassSpecToVarDeclStorageClass(SCSpec); 4172 4173 IdentifierInfo *II = Name.getAsIdentifierInfo(); 4174 if (!II) { 4175 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 4176 << Name; 4177 return 0; 4178 } 4179 4180 DiagnoseFunctionSpecifiers(D); 4181 4182 if (!DC->isRecord() && S->getFnParent() == 0) { 4183 // C99 6.9p2: The storage-class specifiers auto and register shall not 4184 // appear in the declaration specifiers in an external declaration. 4185 if (SC == SC_Auto || SC == SC_Register) { 4186 4187 // If this is a register variable with an asm label specified, then this 4188 // is a GNU extension. 4189 if (SC == SC_Register && D.getAsmLabel()) 4190 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 4191 else 4192 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 4193 D.setInvalidType(); 4194 } 4195 } 4196 4197 if (getLangOpts().OpenCL) { 4198 // Set up the special work-group-local storage class for variables in the 4199 // OpenCL __local address space. 4200 if (R.getAddressSpace() == LangAS::opencl_local) 4201 SC = SC_OpenCLWorkGroupLocal; 4202 } 4203 4204 bool isExplicitSpecialization = false; 4205 VarDecl *NewVD; 4206 if (!getLangOpts().CPlusPlus) { 4207 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4208 D.getIdentifierLoc(), II, 4209 R, TInfo, SC, SCAsWritten); 4210 4211 if (D.isInvalidType()) 4212 NewVD->setInvalidDecl(); 4213 } else { 4214 if (DC->isRecord() && !CurContext->isRecord()) { 4215 // This is an out-of-line definition of a static data member. 4216 if (SC == SC_Static) { 4217 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4218 diag::err_static_out_of_line) 4219 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4220 } else if (SC == SC_None) 4221 SC = SC_Static; 4222 } 4223 if (SC == SC_Static && CurContext->isRecord()) { 4224 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 4225 if (RD->isLocalClass()) 4226 Diag(D.getIdentifierLoc(), 4227 diag::err_static_data_member_not_allowed_in_local_class) 4228 << Name << RD->getDeclName(); 4229 4230 // C++98 [class.union]p1: If a union contains a static data member, 4231 // the program is ill-formed. C++11 drops this restriction. 4232 if (RD->isUnion()) 4233 Diag(D.getIdentifierLoc(), 4234 getLangOpts().CPlusPlus0x 4235 ? diag::warn_cxx98_compat_static_data_member_in_union 4236 : diag::ext_static_data_member_in_union) << Name; 4237 // We conservatively disallow static data members in anonymous structs. 4238 else if (!RD->getDeclName()) 4239 Diag(D.getIdentifierLoc(), 4240 diag::err_static_data_member_not_allowed_in_anon_struct) 4241 << Name << RD->isUnion(); 4242 } 4243 } 4244 4245 // Match up the template parameter lists with the scope specifier, then 4246 // determine whether we have a template or a template specialization. 4247 isExplicitSpecialization = false; 4248 bool Invalid = false; 4249 if (TemplateParameterList *TemplateParams 4250 = MatchTemplateParametersToScopeSpecifier( 4251 D.getDeclSpec().getLocStart(), 4252 D.getIdentifierLoc(), 4253 D.getCXXScopeSpec(), 4254 TemplateParamLists.data(), 4255 TemplateParamLists.size(), 4256 /*never a friend*/ false, 4257 isExplicitSpecialization, 4258 Invalid)) { 4259 if (TemplateParams->size() > 0) { 4260 // There is no such thing as a variable template. 4261 Diag(D.getIdentifierLoc(), diag::err_template_variable) 4262 << II 4263 << SourceRange(TemplateParams->getTemplateLoc(), 4264 TemplateParams->getRAngleLoc()); 4265 return 0; 4266 } else { 4267 // There is an extraneous 'template<>' for this variable. Complain 4268 // about it, but allow the declaration of the variable. 4269 Diag(TemplateParams->getTemplateLoc(), 4270 diag::err_template_variable_noparams) 4271 << II 4272 << SourceRange(TemplateParams->getTemplateLoc(), 4273 TemplateParams->getRAngleLoc()); 4274 } 4275 } 4276 4277 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4278 D.getIdentifierLoc(), II, 4279 R, TInfo, SC, SCAsWritten); 4280 4281 // If this decl has an auto type in need of deduction, make a note of the 4282 // Decl so we can diagnose uses of it in its own initializer. 4283 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 4284 R->getContainedAutoType()) 4285 ParsingInitForAutoVars.insert(NewVD); 4286 4287 if (D.isInvalidType() || Invalid) 4288 NewVD->setInvalidDecl(); 4289 4290 SetNestedNameSpecifier(NewVD, D); 4291 4292 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 4293 NewVD->setTemplateParameterListsInfo(Context, 4294 TemplateParamLists.size(), 4295 TemplateParamLists.data()); 4296 } 4297 4298 if (D.getDeclSpec().isConstexprSpecified()) 4299 NewVD->setConstexpr(true); 4300 } 4301 4302 // Set the lexical context. If the declarator has a C++ scope specifier, the 4303 // lexical context will be different from the semantic context. 4304 NewVD->setLexicalDeclContext(CurContext); 4305 4306 if (D.getDeclSpec().isThreadSpecified()) { 4307 if (NewVD->hasLocalStorage()) 4308 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4309 else if (!Context.getTargetInfo().isTLSSupported()) 4310 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4311 else 4312 NewVD->setThreadSpecified(true); 4313 } 4314 4315 if (D.getDeclSpec().isModulePrivateSpecified()) { 4316 if (isExplicitSpecialization) 4317 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4318 << 2 4319 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4320 else if (NewVD->hasLocalStorage()) 4321 Diag(NewVD->getLocation(), diag::err_module_private_local) 4322 << 0 << NewVD->getDeclName() 4323 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4324 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4325 else 4326 NewVD->setModulePrivate(); 4327 } 4328 4329 // Handle attributes prior to checking for duplicates in MergeVarDecl 4330 ProcessDeclAttributes(S, NewVD, D); 4331 4332 if (getLangOpts().CUDA) { 4333 // CUDA B.2.5: "__shared__ and __constant__ variables have implied static 4334 // storage [duration]." 4335 if (SC == SC_None && S->getFnParent() != 0 && 4336 (NewVD->hasAttr<CUDASharedAttr>() || NewVD->hasAttr<CUDAConstantAttr>())) 4337 NewVD->setStorageClass(SC_Static); 4338 } 4339 4340 // In auto-retain/release, infer strong retension for variables of 4341 // retainable type. 4342 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4343 NewVD->setInvalidDecl(); 4344 4345 // Handle GNU asm-label extension (encoded as an attribute). 4346 if (Expr *E = (Expr*)D.getAsmLabel()) { 4347 // The parser guarantees this is a string. 4348 StringLiteral *SE = cast<StringLiteral>(E); 4349 StringRef Label = SE->getString(); 4350 if (S->getFnParent() != 0) { 4351 switch (SC) { 4352 case SC_None: 4353 case SC_Auto: 4354 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4355 break; 4356 case SC_Register: 4357 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4358 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4359 break; 4360 case SC_Static: 4361 case SC_Extern: 4362 case SC_PrivateExtern: 4363 case SC_OpenCLWorkGroupLocal: 4364 break; 4365 } 4366 } 4367 4368 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4369 Context, Label)); 4370 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 4371 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 4372 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier()); 4373 if (I != ExtnameUndeclaredIdentifiers.end()) { 4374 NewVD->addAttr(I->second); 4375 ExtnameUndeclaredIdentifiers.erase(I); 4376 } 4377 } 4378 4379 // Diagnose shadowed variables before filtering for scope. 4380 if (!D.getCXXScopeSpec().isSet()) 4381 CheckShadow(S, NewVD, Previous); 4382 4383 // Don't consider existing declarations that are in a different 4384 // scope and are out-of-semantic-context declarations (if the new 4385 // declaration has linkage). 4386 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4387 isExplicitSpecialization); 4388 4389 if (!getLangOpts().CPlusPlus) { 4390 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4391 } else { 4392 // Merge the decl with the existing one if appropriate. 4393 if (!Previous.empty()) { 4394 if (Previous.isSingleResult() && 4395 isa<FieldDecl>(Previous.getFoundDecl()) && 4396 D.getCXXScopeSpec().isSet()) { 4397 // The user tried to define a non-static data member 4398 // out-of-line (C++ [dcl.meaning]p1). 4399 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4400 << D.getCXXScopeSpec().getRange(); 4401 Previous.clear(); 4402 NewVD->setInvalidDecl(); 4403 } 4404 } else if (D.getCXXScopeSpec().isSet()) { 4405 // No previous declaration in the qualifying scope. 4406 Diag(D.getIdentifierLoc(), diag::err_no_member) 4407 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4408 << D.getCXXScopeSpec().getRange(); 4409 NewVD->setInvalidDecl(); 4410 } 4411 4412 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4413 4414 // This is an explicit specialization of a static data member. Check it. 4415 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4416 CheckMemberSpecialization(NewVD, Previous)) 4417 NewVD->setInvalidDecl(); 4418 } 4419 4420 // If this is a locally-scoped extern C variable, update the map of 4421 // such variables. 4422 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4423 !NewVD->isInvalidDecl()) 4424 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4425 4426 // If there's a #pragma GCC visibility in scope, and this isn't a class 4427 // member, set the visibility of this variable. 4428 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4429 AddPushedVisibilityAttribute(NewVD); 4430 4431 MarkUnusedFileScopedDecl(NewVD); 4432 4433 return NewVD; 4434} 4435 4436/// \brief Diagnose variable or built-in function shadowing. Implements 4437/// -Wshadow. 4438/// 4439/// This method is called whenever a VarDecl is added to a "useful" 4440/// scope. 4441/// 4442/// \param S the scope in which the shadowing name is being declared 4443/// \param R the lookup of the name 4444/// 4445void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4446 // Return if warning is ignored. 4447 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4448 DiagnosticsEngine::Ignored) 4449 return; 4450 4451 // Don't diagnose declarations at file scope. 4452 if (D->hasGlobalStorage()) 4453 return; 4454 4455 DeclContext *NewDC = D->getDeclContext(); 4456 4457 // Only diagnose if we're shadowing an unambiguous field or variable. 4458 if (R.getResultKind() != LookupResult::Found) 4459 return; 4460 4461 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4462 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4463 return; 4464 4465 // Fields are not shadowed by variables in C++ static methods. 4466 if (isa<FieldDecl>(ShadowedDecl)) 4467 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4468 if (MD->isStatic()) 4469 return; 4470 4471 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4472 if (shadowedVar->isExternC()) { 4473 // For shadowing external vars, make sure that we point to the global 4474 // declaration, not a locally scoped extern declaration. 4475 for (VarDecl::redecl_iterator 4476 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4477 I != E; ++I) 4478 if (I->isFileVarDecl()) { 4479 ShadowedDecl = *I; 4480 break; 4481 } 4482 } 4483 4484 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4485 4486 // Only warn about certain kinds of shadowing for class members. 4487 if (NewDC && NewDC->isRecord()) { 4488 // In particular, don't warn about shadowing non-class members. 4489 if (!OldDC->isRecord()) 4490 return; 4491 4492 // TODO: should we warn about static data members shadowing 4493 // static data members from base classes? 4494 4495 // TODO: don't diagnose for inaccessible shadowed members. 4496 // This is hard to do perfectly because we might friend the 4497 // shadowing context, but that's just a false negative. 4498 } 4499 4500 // Determine what kind of declaration we're shadowing. 4501 unsigned Kind; 4502 if (isa<RecordDecl>(OldDC)) { 4503 if (isa<FieldDecl>(ShadowedDecl)) 4504 Kind = 3; // field 4505 else 4506 Kind = 2; // static data member 4507 } else if (OldDC->isFileContext()) 4508 Kind = 1; // global 4509 else 4510 Kind = 0; // local 4511 4512 DeclarationName Name = R.getLookupName(); 4513 4514 // Emit warning and note. 4515 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4516 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4517} 4518 4519/// \brief Check -Wshadow without the advantage of a previous lookup. 4520void Sema::CheckShadow(Scope *S, VarDecl *D) { 4521 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4522 DiagnosticsEngine::Ignored) 4523 return; 4524 4525 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4526 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4527 LookupName(R, S); 4528 CheckShadow(S, D, R); 4529} 4530 4531/// \brief Perform semantic checking on a newly-created variable 4532/// declaration. 4533/// 4534/// This routine performs all of the type-checking required for a 4535/// variable declaration once it has been built. It is used both to 4536/// check variables after they have been parsed and their declarators 4537/// have been translated into a declaration, and to check variables 4538/// that have been instantiated from a template. 4539/// 4540/// Sets NewVD->isInvalidDecl() if an error was encountered. 4541/// 4542/// Returns true if the variable declaration is a redeclaration. 4543bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4544 LookupResult &Previous) { 4545 // If the decl is already known invalid, don't check it. 4546 if (NewVD->isInvalidDecl()) 4547 return false; 4548 4549 QualType T = NewVD->getType(); 4550 4551 if (T->isObjCObjectType()) { 4552 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4553 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4554 T = Context.getObjCObjectPointerType(T); 4555 NewVD->setType(T); 4556 } 4557 4558 // Emit an error if an address space was applied to decl with local storage. 4559 // This includes arrays of objects with address space qualifiers, but not 4560 // automatic variables that point to other address spaces. 4561 // ISO/IEC TR 18037 S5.1.2 4562 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4563 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4564 NewVD->setInvalidDecl(); 4565 return false; 4566 } 4567 4568 // OpenCL v1.2 s6.8 -- The static qualifier is valid only in program 4569 // scope. 4570 if ((getLangOpts().OpenCLVersion >= 120) 4571 && NewVD->isStaticLocal()) { 4572 Diag(NewVD->getLocation(), diag::err_static_function_scope); 4573 NewVD->setInvalidDecl(); 4574 return false; 4575 } 4576 4577 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4578 && !NewVD->hasAttr<BlocksAttr>()) { 4579 if (getLangOpts().getGC() != LangOptions::NonGC) 4580 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4581 else 4582 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4583 } 4584 4585 bool isVM = T->isVariablyModifiedType(); 4586 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4587 NewVD->hasAttr<BlocksAttr>()) 4588 getCurFunction()->setHasBranchProtectedScope(); 4589 4590 if ((isVM && NewVD->hasLinkage()) || 4591 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4592 bool SizeIsNegative; 4593 llvm::APSInt Oversized; 4594 QualType FixedTy = 4595 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4596 Oversized); 4597 4598 if (FixedTy.isNull() && T->isVariableArrayType()) { 4599 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4600 // FIXME: This won't give the correct result for 4601 // int a[10][n]; 4602 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4603 4604 if (NewVD->isFileVarDecl()) 4605 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4606 << SizeRange; 4607 else if (NewVD->getStorageClass() == SC_Static) 4608 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4609 << SizeRange; 4610 else 4611 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4612 << SizeRange; 4613 NewVD->setInvalidDecl(); 4614 return false; 4615 } 4616 4617 if (FixedTy.isNull()) { 4618 if (NewVD->isFileVarDecl()) 4619 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4620 else 4621 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4622 NewVD->setInvalidDecl(); 4623 return false; 4624 } 4625 4626 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4627 NewVD->setType(FixedTy); 4628 } 4629 4630 if (Previous.empty() && NewVD->isExternC()) { 4631 // Since we did not find anything by this name and we're declaring 4632 // an extern "C" variable, look for a non-visible extern "C" 4633 // declaration with the same name. 4634 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4635 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4636 if (Pos != LocallyScopedExternalDecls.end()) 4637 Previous.addDecl(Pos->second); 4638 } 4639 4640 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4641 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4642 << T; 4643 NewVD->setInvalidDecl(); 4644 return false; 4645 } 4646 4647 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4648 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4649 NewVD->setInvalidDecl(); 4650 return false; 4651 } 4652 4653 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4654 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4655 NewVD->setInvalidDecl(); 4656 return false; 4657 } 4658 4659 if (NewVD->isConstexpr() && !T->isDependentType() && 4660 RequireLiteralType(NewVD->getLocation(), T, 4661 diag::err_constexpr_var_non_literal)) { 4662 NewVD->setInvalidDecl(); 4663 return false; 4664 } 4665 4666 if (!Previous.empty()) { 4667 MergeVarDecl(NewVD, Previous); 4668 return true; 4669 } 4670 return false; 4671} 4672 4673/// \brief Data used with FindOverriddenMethod 4674struct FindOverriddenMethodData { 4675 Sema *S; 4676 CXXMethodDecl *Method; 4677}; 4678 4679/// \brief Member lookup function that determines whether a given C++ 4680/// method overrides a method in a base class, to be used with 4681/// CXXRecordDecl::lookupInBases(). 4682static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4683 CXXBasePath &Path, 4684 void *UserData) { 4685 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4686 4687 FindOverriddenMethodData *Data 4688 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4689 4690 DeclarationName Name = Data->Method->getDeclName(); 4691 4692 // FIXME: Do we care about other names here too? 4693 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4694 // We really want to find the base class destructor here. 4695 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4696 CanQualType CT = Data->S->Context.getCanonicalType(T); 4697 4698 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4699 } 4700 4701 for (Path.Decls = BaseRecord->lookup(Name); 4702 Path.Decls.first != Path.Decls.second; 4703 ++Path.Decls.first) { 4704 NamedDecl *D = *Path.Decls.first; 4705 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4706 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4707 return true; 4708 } 4709 } 4710 4711 return false; 4712} 4713 4714/// AddOverriddenMethods - See if a method overrides any in the base classes, 4715/// and if so, check that it's a valid override and remember it. 4716bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4717 // Look for virtual methods in base classes that this method might override. 4718 CXXBasePaths Paths; 4719 FindOverriddenMethodData Data; 4720 Data.Method = MD; 4721 Data.S = this; 4722 bool AddedAny = false; 4723 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4724 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4725 E = Paths.found_decls_end(); I != E; ++I) { 4726 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4727 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4728 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4729 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4730 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4731 AddedAny = true; 4732 } 4733 } 4734 } 4735 } 4736 4737 return AddedAny; 4738} 4739 4740namespace { 4741 // Struct for holding all of the extra arguments needed by 4742 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4743 struct ActOnFDArgs { 4744 Scope *S; 4745 Declarator &D; 4746 MultiTemplateParamsArg TemplateParamLists; 4747 bool AddToScope; 4748 }; 4749} 4750 4751namespace { 4752 4753// Callback to only accept typo corrections that have a non-zero edit distance. 4754// Also only accept corrections that have the same parent decl. 4755class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4756 public: 4757 DifferentNameValidatorCCC(ASTContext &Context, FunctionDecl *TypoFD, 4758 CXXRecordDecl *Parent) 4759 : Context(Context), OriginalFD(TypoFD), 4760 ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {} 4761 4762 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4763 if (candidate.getEditDistance() == 0) 4764 return false; 4765 4766 llvm::SmallVector<unsigned, 1> MismatchedParams; 4767 for (TypoCorrection::const_decl_iterator CDecl = candidate.begin(), 4768 CDeclEnd = candidate.end(); 4769 CDecl != CDeclEnd; ++CDecl) { 4770 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4771 4772 if (FD && !FD->hasBody() && 4773 hasSimilarParameters(Context, FD, OriginalFD, MismatchedParams)) { 4774 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 4775 CXXRecordDecl *Parent = MD->getParent(); 4776 if (Parent && Parent->getCanonicalDecl() == ExpectedParent) 4777 return true; 4778 } else if (!ExpectedParent) { 4779 return true; 4780 } 4781 } 4782 } 4783 4784 return false; 4785 } 4786 4787 private: 4788 ASTContext &Context; 4789 FunctionDecl *OriginalFD; 4790 CXXRecordDecl *ExpectedParent; 4791}; 4792 4793} 4794 4795/// \brief Generate diagnostics for an invalid function redeclaration. 4796/// 4797/// This routine handles generating the diagnostic messages for an invalid 4798/// function redeclaration, including finding possible similar declarations 4799/// or performing typo correction if there are no previous declarations with 4800/// the same name. 4801/// 4802/// Returns a NamedDecl iff typo correction was performed and substituting in 4803/// the new declaration name does not cause new errors. 4804static NamedDecl* DiagnoseInvalidRedeclaration( 4805 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4806 ActOnFDArgs &ExtraArgs) { 4807 NamedDecl *Result = NULL; 4808 DeclarationName Name = NewFD->getDeclName(); 4809 DeclContext *NewDC = NewFD->getDeclContext(); 4810 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4811 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4812 llvm::SmallVector<unsigned, 1> MismatchedParams; 4813 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4814 TypoCorrection Correction; 4815 bool isFriendDecl = (SemaRef.getLangOpts().CPlusPlus && 4816 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4817 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4818 : diag::err_member_def_does_not_match; 4819 4820 NewFD->setInvalidDecl(); 4821 SemaRef.LookupQualifiedName(Prev, NewDC); 4822 assert(!Prev.isAmbiguous() && 4823 "Cannot have an ambiguity in previous-declaration lookup"); 4824 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 4825 DifferentNameValidatorCCC Validator(SemaRef.Context, NewFD, 4826 MD ? MD->getParent() : 0); 4827 if (!Prev.empty()) { 4828 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4829 Func != FuncEnd; ++Func) { 4830 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4831 if (FD && 4832 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4833 // Add 1 to the index so that 0 can mean the mismatch didn't 4834 // involve a parameter 4835 unsigned ParamNum = 4836 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4837 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4838 } 4839 } 4840 // If the qualified name lookup yielded nothing, try typo correction 4841 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4842 Prev.getLookupKind(), 0, 0, 4843 Validator, NewDC))) { 4844 // Trap errors. 4845 Sema::SFINAETrap Trap(SemaRef); 4846 4847 // Set up everything for the call to ActOnFunctionDeclarator 4848 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4849 ExtraArgs.D.getIdentifierLoc()); 4850 Previous.clear(); 4851 Previous.setLookupName(Correction.getCorrection()); 4852 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4853 CDeclEnd = Correction.end(); 4854 CDecl != CDeclEnd; ++CDecl) { 4855 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4856 if (FD && !FD->hasBody() && 4857 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4858 Previous.addDecl(FD); 4859 } 4860 } 4861 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4862 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4863 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4864 // eliminate the need for the parameter pack ExtraArgs. 4865 Result = SemaRef.ActOnFunctionDeclarator( 4866 ExtraArgs.S, ExtraArgs.D, 4867 Correction.getCorrectionDecl()->getDeclContext(), 4868 NewFD->getTypeSourceInfo(), Previous, ExtraArgs.TemplateParamLists, 4869 ExtraArgs.AddToScope); 4870 if (Trap.hasErrorOccurred()) { 4871 // Pretend the typo correction never occurred 4872 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4873 ExtraArgs.D.getIdentifierLoc()); 4874 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4875 Previous.clear(); 4876 Previous.setLookupName(Name); 4877 Result = NULL; 4878 } else { 4879 for (LookupResult::iterator Func = Previous.begin(), 4880 FuncEnd = Previous.end(); 4881 Func != FuncEnd; ++Func) { 4882 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4883 NearMatches.push_back(std::make_pair(FD, 0)); 4884 } 4885 } 4886 if (NearMatches.empty()) { 4887 // Ignore the correction if it didn't yield any close FunctionDecl matches 4888 Correction = TypoCorrection(); 4889 } else { 4890 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4891 : diag::err_member_def_does_not_match_suggest; 4892 } 4893 } 4894 4895 if (Correction) { 4896 SourceRange FixItLoc(NewFD->getLocation()); 4897 CXXScopeSpec &SS = ExtraArgs.D.getCXXScopeSpec(); 4898 if (Correction.getCorrectionSpecifier() && SS.isValid()) 4899 FixItLoc.setBegin(SS.getBeginLoc()); 4900 SemaRef.Diag(NewFD->getLocStart(), DiagMsg) 4901 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOpts()) 4902 << FixItHint::CreateReplacement( 4903 FixItLoc, Correction.getAsString(SemaRef.getLangOpts())); 4904 } else { 4905 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4906 << Name << NewDC << NewFD->getLocation(); 4907 } 4908 4909 bool NewFDisConst = false; 4910 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4911 NewFDisConst = NewMD->isConst(); 4912 4913 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4914 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4915 NearMatch != NearMatchEnd; ++NearMatch) { 4916 FunctionDecl *FD = NearMatch->first; 4917 bool FDisConst = false; 4918 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4919 FDisConst = MD->isConst(); 4920 4921 if (unsigned Idx = NearMatch->second) { 4922 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4923 SourceLocation Loc = FDParam->getTypeSpecStartLoc(); 4924 if (Loc.isInvalid()) Loc = FD->getLocation(); 4925 SemaRef.Diag(Loc, diag::note_member_def_close_param_match) 4926 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4927 } else if (Correction) { 4928 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4929 << Correction.getQuoted(SemaRef.getLangOpts()); 4930 } else if (FDisConst != NewFDisConst) { 4931 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4932 << NewFDisConst << FD->getSourceRange().getEnd(); 4933 } else 4934 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4935 } 4936 return Result; 4937} 4938 4939static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4940 Declarator &D) { 4941 switch (D.getDeclSpec().getStorageClassSpec()) { 4942 default: llvm_unreachable("Unknown storage class!"); 4943 case DeclSpec::SCS_auto: 4944 case DeclSpec::SCS_register: 4945 case DeclSpec::SCS_mutable: 4946 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4947 diag::err_typecheck_sclass_func); 4948 D.setInvalidType(); 4949 break; 4950 case DeclSpec::SCS_unspecified: break; 4951 case DeclSpec::SCS_extern: return SC_Extern; 4952 case DeclSpec::SCS_static: { 4953 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4954 // C99 6.7.1p5: 4955 // The declaration of an identifier for a function that has 4956 // block scope shall have no explicit storage-class specifier 4957 // other than extern 4958 // See also (C++ [dcl.stc]p4). 4959 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4960 diag::err_static_block_func); 4961 break; 4962 } else 4963 return SC_Static; 4964 } 4965 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4966 } 4967 4968 // No explicit storage class has already been returned 4969 return SC_None; 4970} 4971 4972static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4973 DeclContext *DC, QualType &R, 4974 TypeSourceInfo *TInfo, 4975 FunctionDecl::StorageClass SC, 4976 bool &IsVirtualOkay) { 4977 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4978 DeclarationName Name = NameInfo.getName(); 4979 4980 FunctionDecl *NewFD = 0; 4981 bool isInline = D.getDeclSpec().isInlineSpecified(); 4982 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4983 FunctionDecl::StorageClass SCAsWritten 4984 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4985 4986 if (!SemaRef.getLangOpts().CPlusPlus) { 4987 // Determine whether the function was written with a 4988 // prototype. This true when: 4989 // - there is a prototype in the declarator, or 4990 // - the type R of the function is some kind of typedef or other reference 4991 // to a type name (which eventually refers to a function type). 4992 bool HasPrototype = 4993 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4994 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4995 4996 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4997 D.getLocStart(), NameInfo, R, 4998 TInfo, SC, SCAsWritten, isInline, 4999 HasPrototype); 5000 if (D.isInvalidType()) 5001 NewFD->setInvalidDecl(); 5002 5003 // Set the lexical context. 5004 NewFD->setLexicalDeclContext(SemaRef.CurContext); 5005 5006 return NewFD; 5007 } 5008 5009 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 5010 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 5011 5012 // Check that the return type is not an abstract class type. 5013 // For record types, this is done by the AbstractClassUsageDiagnoser once 5014 // the class has been completely parsed. 5015 if (!DC->isRecord() && 5016 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 5017 R->getAs<FunctionType>()->getResultType(), 5018 diag::err_abstract_type_in_decl, 5019 SemaRef.AbstractReturnType)) 5020 D.setInvalidType(); 5021 5022 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 5023 // This is a C++ constructor declaration. 5024 assert(DC->isRecord() && 5025 "Constructors can only be declared in a member context"); 5026 5027 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 5028 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 5029 D.getLocStart(), NameInfo, 5030 R, TInfo, isExplicit, isInline, 5031 /*isImplicitlyDeclared=*/false, 5032 isConstexpr); 5033 5034 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 5035 // This is a C++ destructor declaration. 5036 if (DC->isRecord()) { 5037 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 5038 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 5039 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 5040 SemaRef.Context, Record, 5041 D.getLocStart(), 5042 NameInfo, R, TInfo, isInline, 5043 /*isImplicitlyDeclared=*/false); 5044 5045 // If the class is complete, then we now create the implicit exception 5046 // specification. If the class is incomplete or dependent, we can't do 5047 // it yet. 5048 if (SemaRef.getLangOpts().CPlusPlus0x && !Record->isDependentType() && 5049 Record->getDefinition() && !Record->isBeingDefined() && 5050 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 5051 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 5052 } 5053 5054 IsVirtualOkay = true; 5055 return NewDD; 5056 5057 } else { 5058 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 5059 D.setInvalidType(); 5060 5061 // Create a FunctionDecl to satisfy the function definition parsing 5062 // code path. 5063 return FunctionDecl::Create(SemaRef.Context, DC, 5064 D.getLocStart(), 5065 D.getIdentifierLoc(), Name, R, TInfo, 5066 SC, SCAsWritten, isInline, 5067 /*hasPrototype=*/true, isConstexpr); 5068 } 5069 5070 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 5071 if (!DC->isRecord()) { 5072 SemaRef.Diag(D.getIdentifierLoc(), 5073 diag::err_conv_function_not_member); 5074 return 0; 5075 } 5076 5077 SemaRef.CheckConversionDeclarator(D, R, SC); 5078 IsVirtualOkay = true; 5079 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 5080 D.getLocStart(), NameInfo, 5081 R, TInfo, isInline, isExplicit, 5082 isConstexpr, SourceLocation()); 5083 5084 } else if (DC->isRecord()) { 5085 // If the name of the function is the same as the name of the record, 5086 // then this must be an invalid constructor that has a return type. 5087 // (The parser checks for a return type and makes the declarator a 5088 // constructor if it has no return type). 5089 if (Name.getAsIdentifierInfo() && 5090 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 5091 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 5092 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5093 << SourceRange(D.getIdentifierLoc()); 5094 return 0; 5095 } 5096 5097 bool isStatic = SC == SC_Static; 5098 5099 // [class.free]p1: 5100 // Any allocation function for a class T is a static member 5101 // (even if not explicitly declared static). 5102 if (Name.getCXXOverloadedOperator() == OO_New || 5103 Name.getCXXOverloadedOperator() == OO_Array_New) 5104 isStatic = true; 5105 5106 // [class.free]p6 Any deallocation function for a class X is a static member 5107 // (even if not explicitly declared static). 5108 if (Name.getCXXOverloadedOperator() == OO_Delete || 5109 Name.getCXXOverloadedOperator() == OO_Array_Delete) 5110 isStatic = true; 5111 5112 IsVirtualOkay = !isStatic; 5113 5114 // This is a C++ method declaration. 5115 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 5116 D.getLocStart(), NameInfo, R, 5117 TInfo, isStatic, SCAsWritten, isInline, 5118 isConstexpr, SourceLocation()); 5119 5120 } else { 5121 // Determine whether the function was written with a 5122 // prototype. This true when: 5123 // - we're in C++ (where every function has a prototype), 5124 return FunctionDecl::Create(SemaRef.Context, DC, 5125 D.getLocStart(), 5126 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 5127 true/*HasPrototype*/, isConstexpr); 5128 } 5129} 5130 5131void Sema::checkVoidParamDecl(ParmVarDecl *Param) { 5132 // In C++, the empty parameter-type-list must be spelled "void"; a 5133 // typedef of void is not permitted. 5134 if (getLangOpts().CPlusPlus && 5135 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5136 bool IsTypeAlias = false; 5137 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5138 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5139 else if (const TemplateSpecializationType *TST = 5140 Param->getType()->getAs<TemplateSpecializationType>()) 5141 IsTypeAlias = TST->isTypeAlias(); 5142 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5143 << IsTypeAlias; 5144 } 5145} 5146 5147NamedDecl* 5148Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 5149 TypeSourceInfo *TInfo, LookupResult &Previous, 5150 MultiTemplateParamsArg TemplateParamLists, 5151 bool &AddToScope) { 5152 QualType R = TInfo->getType(); 5153 5154 assert(R.getTypePtr()->isFunctionType()); 5155 5156 // TODO: consider using NameInfo for diagnostic. 5157 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 5158 DeclarationName Name = NameInfo.getName(); 5159 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 5160 5161 if (D.getDeclSpec().isThreadSpecified()) 5162 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5163 5164 // Do not allow returning a objc interface by-value. 5165 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 5166 Diag(D.getIdentifierLoc(), 5167 diag::err_object_cannot_be_passed_returned_by_value) << 0 5168 << R->getAs<FunctionType>()->getResultType() 5169 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 5170 5171 QualType T = R->getAs<FunctionType>()->getResultType(); 5172 T = Context.getObjCObjectPointerType(T); 5173 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 5174 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 5175 R = Context.getFunctionType(T, FPT->arg_type_begin(), 5176 FPT->getNumArgs(), EPI); 5177 } 5178 else if (isa<FunctionNoProtoType>(R)) 5179 R = Context.getFunctionNoProtoType(T); 5180 } 5181 5182 bool isFriend = false; 5183 FunctionTemplateDecl *FunctionTemplate = 0; 5184 bool isExplicitSpecialization = false; 5185 bool isFunctionTemplateSpecialization = false; 5186 5187 bool isDependentClassScopeExplicitSpecialization = false; 5188 bool HasExplicitTemplateArgs = false; 5189 TemplateArgumentListInfo TemplateArgs; 5190 5191 bool isVirtualOkay = false; 5192 5193 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 5194 isVirtualOkay); 5195 if (!NewFD) return 0; 5196 5197 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 5198 NewFD->setTopLevelDeclInObjCContainer(); 5199 5200 if (getLangOpts().CPlusPlus) { 5201 bool isInline = D.getDeclSpec().isInlineSpecified(); 5202 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5203 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 5204 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 5205 isFriend = D.getDeclSpec().isFriendSpecified(); 5206 if (isFriend && !isInline && D.isFunctionDefinition()) { 5207 // C++ [class.friend]p5 5208 // A function can be defined in a friend declaration of a 5209 // class . . . . Such a function is implicitly inline. 5210 NewFD->setImplicitlyInline(); 5211 } 5212 5213 // If this is a method defined in an __interface, and is not a constructor 5214 // or an overloaded operator, then set the pure flag (isVirtual will already 5215 // return true). 5216 if (const CXXRecordDecl *Parent = 5217 dyn_cast<CXXRecordDecl>(NewFD->getDeclContext())) { 5218 if (Parent->isInterface() && cast<CXXMethodDecl>(NewFD)->isUserProvided()) 5219 NewFD->setPure(true); 5220 } 5221 5222 SetNestedNameSpecifier(NewFD, D); 5223 isExplicitSpecialization = false; 5224 isFunctionTemplateSpecialization = false; 5225 if (D.isInvalidType()) 5226 NewFD->setInvalidDecl(); 5227 5228 // Set the lexical context. If the declarator has a C++ 5229 // scope specifier, or is the object of a friend declaration, the 5230 // lexical context will be different from the semantic context. 5231 NewFD->setLexicalDeclContext(CurContext); 5232 5233 // Match up the template parameter lists with the scope specifier, then 5234 // determine whether we have a template or a template specialization. 5235 bool Invalid = false; 5236 if (TemplateParameterList *TemplateParams 5237 = MatchTemplateParametersToScopeSpecifier( 5238 D.getDeclSpec().getLocStart(), 5239 D.getIdentifierLoc(), 5240 D.getCXXScopeSpec(), 5241 TemplateParamLists.data(), 5242 TemplateParamLists.size(), 5243 isFriend, 5244 isExplicitSpecialization, 5245 Invalid)) { 5246 if (TemplateParams->size() > 0) { 5247 // This is a function template 5248 5249 // Check that we can declare a template here. 5250 if (CheckTemplateDeclScope(S, TemplateParams)) 5251 return 0; 5252 5253 // A destructor cannot be a template. 5254 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 5255 Diag(NewFD->getLocation(), diag::err_destructor_template); 5256 return 0; 5257 } 5258 5259 // If we're adding a template to a dependent context, we may need to 5260 // rebuilding some of the types used within the template parameter list, 5261 // now that we know what the current instantiation is. 5262 if (DC->isDependentContext()) { 5263 ContextRAII SavedContext(*this, DC); 5264 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 5265 Invalid = true; 5266 } 5267 5268 5269 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 5270 NewFD->getLocation(), 5271 Name, TemplateParams, 5272 NewFD); 5273 FunctionTemplate->setLexicalDeclContext(CurContext); 5274 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 5275 5276 // For source fidelity, store the other template param lists. 5277 if (TemplateParamLists.size() > 1) { 5278 NewFD->setTemplateParameterListsInfo(Context, 5279 TemplateParamLists.size() - 1, 5280 TemplateParamLists.data()); 5281 } 5282 } else { 5283 // This is a function template specialization. 5284 isFunctionTemplateSpecialization = true; 5285 // For source fidelity, store all the template param lists. 5286 NewFD->setTemplateParameterListsInfo(Context, 5287 TemplateParamLists.size(), 5288 TemplateParamLists.data()); 5289 5290 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 5291 if (isFriend) { 5292 // We want to remove the "template<>", found here. 5293 SourceRange RemoveRange = TemplateParams->getSourceRange(); 5294 5295 // If we remove the template<> and the name is not a 5296 // template-id, we're actually silently creating a problem: 5297 // the friend declaration will refer to an untemplated decl, 5298 // and clearly the user wants a template specialization. So 5299 // we need to insert '<>' after the name. 5300 SourceLocation InsertLoc; 5301 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 5302 InsertLoc = D.getName().getSourceRange().getEnd(); 5303 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 5304 } 5305 5306 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 5307 << Name << RemoveRange 5308 << FixItHint::CreateRemoval(RemoveRange) 5309 << FixItHint::CreateInsertion(InsertLoc, "<>"); 5310 } 5311 } 5312 } 5313 else { 5314 // All template param lists were matched against the scope specifier: 5315 // this is NOT (an explicit specialization of) a template. 5316 if (TemplateParamLists.size() > 0) 5317 // For source fidelity, store all the template param lists. 5318 NewFD->setTemplateParameterListsInfo(Context, 5319 TemplateParamLists.size(), 5320 TemplateParamLists.data()); 5321 } 5322 5323 if (Invalid) { 5324 NewFD->setInvalidDecl(); 5325 if (FunctionTemplate) 5326 FunctionTemplate->setInvalidDecl(); 5327 } 5328 5329 // C++ [dcl.fct.spec]p5: 5330 // The virtual specifier shall only be used in declarations of 5331 // nonstatic class member functions that appear within a 5332 // member-specification of a class declaration; see 10.3. 5333 // 5334 if (isVirtual && !NewFD->isInvalidDecl()) { 5335 if (!isVirtualOkay) { 5336 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5337 diag::err_virtual_non_function); 5338 } else if (!CurContext->isRecord()) { 5339 // 'virtual' was specified outside of the class. 5340 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5341 diag::err_virtual_out_of_class) 5342 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5343 } else if (NewFD->getDescribedFunctionTemplate()) { 5344 // C++ [temp.mem]p3: 5345 // A member function template shall not be virtual. 5346 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5347 diag::err_virtual_member_function_template) 5348 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5349 } else { 5350 // Okay: Add virtual to the method. 5351 NewFD->setVirtualAsWritten(true); 5352 } 5353 } 5354 5355 // C++ [dcl.fct.spec]p3: 5356 // The inline specifier shall not appear on a block scope function 5357 // declaration. 5358 if (isInline && !NewFD->isInvalidDecl()) { 5359 if (CurContext->isFunctionOrMethod()) { 5360 // 'inline' is not allowed on block scope function declaration. 5361 Diag(D.getDeclSpec().getInlineSpecLoc(), 5362 diag::err_inline_declaration_block_scope) << Name 5363 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5364 } 5365 } 5366 5367 // C++ [dcl.fct.spec]p6: 5368 // The explicit specifier shall be used only in the declaration of a 5369 // constructor or conversion function within its class definition; 5370 // see 12.3.1 and 12.3.2. 5371 if (isExplicit && !NewFD->isInvalidDecl()) { 5372 if (!CurContext->isRecord()) { 5373 // 'explicit' was specified outside of the class. 5374 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5375 diag::err_explicit_out_of_class) 5376 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5377 } else if (!isa<CXXConstructorDecl>(NewFD) && 5378 !isa<CXXConversionDecl>(NewFD)) { 5379 // 'explicit' was specified on a function that wasn't a constructor 5380 // or conversion function. 5381 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5382 diag::err_explicit_non_ctor_or_conv_function) 5383 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5384 } 5385 } 5386 5387 if (isConstexpr) { 5388 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5389 // are implicitly inline. 5390 NewFD->setImplicitlyInline(); 5391 5392 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5393 // be either constructors or to return a literal type. Therefore, 5394 // destructors cannot be declared constexpr. 5395 if (isa<CXXDestructorDecl>(NewFD)) 5396 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5397 } 5398 5399 // If __module_private__ was specified, mark the function accordingly. 5400 if (D.getDeclSpec().isModulePrivateSpecified()) { 5401 if (isFunctionTemplateSpecialization) { 5402 SourceLocation ModulePrivateLoc 5403 = D.getDeclSpec().getModulePrivateSpecLoc(); 5404 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5405 << 0 5406 << FixItHint::CreateRemoval(ModulePrivateLoc); 5407 } else { 5408 NewFD->setModulePrivate(); 5409 if (FunctionTemplate) 5410 FunctionTemplate->setModulePrivate(); 5411 } 5412 } 5413 5414 if (isFriend) { 5415 // For now, claim that the objects have no previous declaration. 5416 if (FunctionTemplate) { 5417 FunctionTemplate->setObjectOfFriendDecl(false); 5418 FunctionTemplate->setAccess(AS_public); 5419 } 5420 NewFD->setObjectOfFriendDecl(false); 5421 NewFD->setAccess(AS_public); 5422 } 5423 5424 // If a function is defined as defaulted or deleted, mark it as such now. 5425 switch (D.getFunctionDefinitionKind()) { 5426 case FDK_Declaration: 5427 case FDK_Definition: 5428 break; 5429 5430 case FDK_Defaulted: 5431 NewFD->setDefaulted(); 5432 break; 5433 5434 case FDK_Deleted: 5435 NewFD->setDeletedAsWritten(); 5436 break; 5437 } 5438 5439 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5440 D.isFunctionDefinition()) { 5441 // C++ [class.mfct]p2: 5442 // A member function may be defined (8.4) in its class definition, in 5443 // which case it is an inline member function (7.1.2) 5444 NewFD->setImplicitlyInline(); 5445 } 5446 5447 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5448 !CurContext->isRecord()) { 5449 // C++ [class.static]p1: 5450 // A data or function member of a class may be declared static 5451 // in a class definition, in which case it is a static member of 5452 // the class. 5453 5454 // Complain about the 'static' specifier if it's on an out-of-line 5455 // member function definition. 5456 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5457 diag::err_static_out_of_line) 5458 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5459 } 5460 } 5461 5462 // Filter out previous declarations that don't match the scope. 5463 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5464 isExplicitSpecialization || 5465 isFunctionTemplateSpecialization); 5466 5467 // Handle GNU asm-label extension (encoded as an attribute). 5468 if (Expr *E = (Expr*) D.getAsmLabel()) { 5469 // The parser guarantees this is a string. 5470 StringLiteral *SE = cast<StringLiteral>(E); 5471 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5472 SE->getString())); 5473 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 5474 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 5475 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); 5476 if (I != ExtnameUndeclaredIdentifiers.end()) { 5477 NewFD->addAttr(I->second); 5478 ExtnameUndeclaredIdentifiers.erase(I); 5479 } 5480 } 5481 5482 // Copy the parameter declarations from the declarator D to the function 5483 // declaration NewFD, if they are available. First scavenge them into Params. 5484 SmallVector<ParmVarDecl*, 16> Params; 5485 if (D.isFunctionDeclarator()) { 5486 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5487 5488 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5489 // function that takes no arguments, not a function that takes a 5490 // single void argument. 5491 // We let through "const void" here because Sema::GetTypeForDeclarator 5492 // already checks for that case. 5493 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5494 FTI.ArgInfo[0].Param && 5495 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5496 // Empty arg list, don't push any params. 5497 checkVoidParamDecl(cast<ParmVarDecl>(FTI.ArgInfo[0].Param)); 5498 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5499 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5500 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5501 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5502 Param->setDeclContext(NewFD); 5503 Params.push_back(Param); 5504 5505 if (Param->isInvalidDecl()) 5506 NewFD->setInvalidDecl(); 5507 } 5508 } 5509 5510 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5511 // When we're declaring a function with a typedef, typeof, etc as in the 5512 // following example, we'll need to synthesize (unnamed) 5513 // parameters for use in the declaration. 5514 // 5515 // @code 5516 // typedef void fn(int); 5517 // fn f; 5518 // @endcode 5519 5520 // Synthesize a parameter for each argument type. 5521 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5522 AE = FT->arg_type_end(); AI != AE; ++AI) { 5523 ParmVarDecl *Param = 5524 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5525 Param->setScopeInfo(0, Params.size()); 5526 Params.push_back(Param); 5527 } 5528 } else { 5529 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5530 "Should not need args for typedef of non-prototype fn"); 5531 } 5532 5533 // Finally, we know we have the right number of parameters, install them. 5534 NewFD->setParams(Params); 5535 5536 // Find all anonymous symbols defined during the declaration of this function 5537 // and add to NewFD. This lets us track decls such 'enum Y' in: 5538 // 5539 // void f(enum Y {AA} x) {} 5540 // 5541 // which would otherwise incorrectly end up in the translation unit scope. 5542 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope); 5543 DeclsInPrototypeScope.clear(); 5544 5545 // Process the non-inheritable attributes on this declaration. 5546 ProcessDeclAttributes(S, NewFD, D, 5547 /*NonInheritable=*/true, /*Inheritable=*/false); 5548 5549 // Functions returning a variably modified type violate C99 6.7.5.2p2 5550 // because all functions have linkage. 5551 if (!NewFD->isInvalidDecl() && 5552 NewFD->getResultType()->isVariablyModifiedType()) { 5553 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5554 NewFD->setInvalidDecl(); 5555 } 5556 5557 // Handle attributes. 5558 ProcessDeclAttributes(S, NewFD, D, 5559 /*NonInheritable=*/false, /*Inheritable=*/true); 5560 5561 if (!getLangOpts().CPlusPlus) { 5562 // Perform semantic checking on the function declaration. 5563 bool isExplicitSpecialization=false; 5564 if (!NewFD->isInvalidDecl()) { 5565 if (NewFD->isMain()) 5566 CheckMain(NewFD, D.getDeclSpec()); 5567 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5568 isExplicitSpecialization)); 5569 } 5570 // Make graceful recovery from an invalid redeclaration. 5571 else if (!Previous.empty()) 5572 D.setRedeclaration(true); 5573 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5574 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5575 "previous declaration set still overloaded"); 5576 } else { 5577 // If the declarator is a template-id, translate the parser's template 5578 // argument list into our AST format. 5579 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5580 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5581 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5582 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5583 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(), 5584 TemplateId->NumArgs); 5585 translateTemplateArguments(TemplateArgsPtr, 5586 TemplateArgs); 5587 5588 HasExplicitTemplateArgs = true; 5589 5590 if (NewFD->isInvalidDecl()) { 5591 HasExplicitTemplateArgs = false; 5592 } else if (FunctionTemplate) { 5593 // Function template with explicit template arguments. 5594 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5595 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5596 5597 HasExplicitTemplateArgs = false; 5598 } else if (!isFunctionTemplateSpecialization && 5599 !D.getDeclSpec().isFriendSpecified()) { 5600 // We have encountered something that the user meant to be a 5601 // specialization (because it has explicitly-specified template 5602 // arguments) but that was not introduced with a "template<>" (or had 5603 // too few of them). 5604 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5605 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5606 << FixItHint::CreateInsertion( 5607 D.getDeclSpec().getLocStart(), 5608 "template<> "); 5609 isFunctionTemplateSpecialization = true; 5610 } else { 5611 // "friend void foo<>(int);" is an implicit specialization decl. 5612 isFunctionTemplateSpecialization = true; 5613 } 5614 } else if (isFriend && isFunctionTemplateSpecialization) { 5615 // This combination is only possible in a recovery case; the user 5616 // wrote something like: 5617 // template <> friend void foo(int); 5618 // which we're recovering from as if the user had written: 5619 // friend void foo<>(int); 5620 // Go ahead and fake up a template id. 5621 HasExplicitTemplateArgs = true; 5622 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5623 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5624 } 5625 5626 // If it's a friend (and only if it's a friend), it's possible 5627 // that either the specialized function type or the specialized 5628 // template is dependent, and therefore matching will fail. In 5629 // this case, don't check the specialization yet. 5630 bool InstantiationDependent = false; 5631 if (isFunctionTemplateSpecialization && isFriend && 5632 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5633 TemplateSpecializationType::anyDependentTemplateArguments( 5634 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5635 InstantiationDependent))) { 5636 assert(HasExplicitTemplateArgs && 5637 "friend function specialization without template args"); 5638 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5639 Previous)) 5640 NewFD->setInvalidDecl(); 5641 } else if (isFunctionTemplateSpecialization) { 5642 if (CurContext->isDependentContext() && CurContext->isRecord() 5643 && !isFriend) { 5644 isDependentClassScopeExplicitSpecialization = true; 5645 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ? 5646 diag::ext_function_specialization_in_class : 5647 diag::err_function_specialization_in_class) 5648 << NewFD->getDeclName(); 5649 } else if (CheckFunctionTemplateSpecialization(NewFD, 5650 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5651 Previous)) 5652 NewFD->setInvalidDecl(); 5653 5654 // C++ [dcl.stc]p1: 5655 // A storage-class-specifier shall not be specified in an explicit 5656 // specialization (14.7.3) 5657 if (SC != SC_None) { 5658 if (SC != NewFD->getStorageClass()) 5659 Diag(NewFD->getLocation(), 5660 diag::err_explicit_specialization_inconsistent_storage_class) 5661 << SC 5662 << FixItHint::CreateRemoval( 5663 D.getDeclSpec().getStorageClassSpecLoc()); 5664 5665 else 5666 Diag(NewFD->getLocation(), 5667 diag::ext_explicit_specialization_storage_class) 5668 << FixItHint::CreateRemoval( 5669 D.getDeclSpec().getStorageClassSpecLoc()); 5670 } 5671 5672 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5673 if (CheckMemberSpecialization(NewFD, Previous)) 5674 NewFD->setInvalidDecl(); 5675 } 5676 5677 // Perform semantic checking on the function declaration. 5678 if (!isDependentClassScopeExplicitSpecialization) { 5679 if (NewFD->isInvalidDecl()) { 5680 // If this is a class member, mark the class invalid immediately. 5681 // This avoids some consistency errors later. 5682 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5683 methodDecl->getParent()->setInvalidDecl(); 5684 } else { 5685 if (NewFD->isMain()) 5686 CheckMain(NewFD, D.getDeclSpec()); 5687 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5688 isExplicitSpecialization)); 5689 } 5690 } 5691 5692 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5693 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5694 "previous declaration set still overloaded"); 5695 5696 NamedDecl *PrincipalDecl = (FunctionTemplate 5697 ? cast<NamedDecl>(FunctionTemplate) 5698 : NewFD); 5699 5700 if (isFriend && D.isRedeclaration()) { 5701 AccessSpecifier Access = AS_public; 5702 if (!NewFD->isInvalidDecl()) 5703 Access = NewFD->getPreviousDecl()->getAccess(); 5704 5705 NewFD->setAccess(Access); 5706 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5707 5708 PrincipalDecl->setObjectOfFriendDecl(true); 5709 } 5710 5711 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5712 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5713 PrincipalDecl->setNonMemberOperator(); 5714 5715 // If we have a function template, check the template parameter 5716 // list. This will check and merge default template arguments. 5717 if (FunctionTemplate) { 5718 FunctionTemplateDecl *PrevTemplate = 5719 FunctionTemplate->getPreviousDecl(); 5720 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5721 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5722 D.getDeclSpec().isFriendSpecified() 5723 ? (D.isFunctionDefinition() 5724 ? TPC_FriendFunctionTemplateDefinition 5725 : TPC_FriendFunctionTemplate) 5726 : (D.getCXXScopeSpec().isSet() && 5727 DC && DC->isRecord() && 5728 DC->isDependentContext()) 5729 ? TPC_ClassTemplateMember 5730 : TPC_FunctionTemplate); 5731 } 5732 5733 if (NewFD->isInvalidDecl()) { 5734 // Ignore all the rest of this. 5735 } else if (!D.isRedeclaration()) { 5736 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5737 AddToScope }; 5738 // Fake up an access specifier if it's supposed to be a class member. 5739 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5740 NewFD->setAccess(AS_public); 5741 5742 // Qualified decls generally require a previous declaration. 5743 if (D.getCXXScopeSpec().isSet()) { 5744 // ...with the major exception of templated-scope or 5745 // dependent-scope friend declarations. 5746 5747 // TODO: we currently also suppress this check in dependent 5748 // contexts because (1) the parameter depth will be off when 5749 // matching friend templates and (2) we might actually be 5750 // selecting a friend based on a dependent factor. But there 5751 // are situations where these conditions don't apply and we 5752 // can actually do this check immediately. 5753 if (isFriend && 5754 (TemplateParamLists.size() || 5755 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5756 CurContext->isDependentContext())) { 5757 // ignore these 5758 } else { 5759 // The user tried to provide an out-of-line definition for a 5760 // function that is a member of a class or namespace, but there 5761 // was no such member function declared (C++ [class.mfct]p2, 5762 // C++ [namespace.memdef]p2). For example: 5763 // 5764 // class X { 5765 // void f() const; 5766 // }; 5767 // 5768 // void X::f() { } // ill-formed 5769 // 5770 // Complain about this problem, and attempt to suggest close 5771 // matches (e.g., those that differ only in cv-qualifiers and 5772 // whether the parameter types are references). 5773 5774 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5775 NewFD, 5776 ExtraArgs)) { 5777 AddToScope = ExtraArgs.AddToScope; 5778 return Result; 5779 } 5780 } 5781 5782 // Unqualified local friend declarations are required to resolve 5783 // to something. 5784 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5785 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5786 NewFD, 5787 ExtraArgs)) { 5788 AddToScope = ExtraArgs.AddToScope; 5789 return Result; 5790 } 5791 } 5792 5793 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5794 !isFriend && !isFunctionTemplateSpecialization && 5795 !isExplicitSpecialization) { 5796 // An out-of-line member function declaration must also be a 5797 // definition (C++ [dcl.meaning]p1). 5798 // Note that this is not the case for explicit specializations of 5799 // function templates or member functions of class templates, per 5800 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5801 // extension for compatibility with old SWIG code which likes to 5802 // generate them. 5803 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5804 << D.getCXXScopeSpec().getRange(); 5805 } 5806 } 5807 5808 AddKnownFunctionAttributes(NewFD); 5809 5810 if (NewFD->hasAttr<OverloadableAttr>() && 5811 !NewFD->getType()->getAs<FunctionProtoType>()) { 5812 Diag(NewFD->getLocation(), 5813 diag::err_attribute_overloadable_no_prototype) 5814 << NewFD; 5815 5816 // Turn this into a variadic function with no parameters. 5817 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5818 FunctionProtoType::ExtProtoInfo EPI; 5819 EPI.Variadic = true; 5820 EPI.ExtInfo = FT->getExtInfo(); 5821 5822 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5823 NewFD->setType(R); 5824 } 5825 5826 // If there's a #pragma GCC visibility in scope, and this isn't a class 5827 // member, set the visibility of this function. 5828 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5829 AddPushedVisibilityAttribute(NewFD); 5830 5831 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5832 // marking the function. 5833 AddCFAuditedAttribute(NewFD); 5834 5835 // If this is a locally-scoped extern C function, update the 5836 // map of such names. 5837 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5838 && !NewFD->isInvalidDecl()) 5839 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5840 5841 // Set this FunctionDecl's range up to the right paren. 5842 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5843 5844 if (getLangOpts().CPlusPlus) { 5845 if (FunctionTemplate) { 5846 if (NewFD->isInvalidDecl()) 5847 FunctionTemplate->setInvalidDecl(); 5848 return FunctionTemplate; 5849 } 5850 } 5851 5852 // OpenCL v1.2 s6.8 static is invalid for kernel functions. 5853 if ((getLangOpts().OpenCLVersion >= 120) 5854 && NewFD->hasAttr<OpenCLKernelAttr>() 5855 && (SC == SC_Static)) { 5856 Diag(D.getIdentifierLoc(), diag::err_static_kernel); 5857 D.setInvalidType(); 5858 } 5859 5860 MarkUnusedFileScopedDecl(NewFD); 5861 5862 if (getLangOpts().CUDA) 5863 if (IdentifierInfo *II = NewFD->getIdentifier()) 5864 if (!NewFD->isInvalidDecl() && 5865 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5866 if (II->isStr("cudaConfigureCall")) { 5867 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5868 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5869 5870 Context.setcudaConfigureCallDecl(NewFD); 5871 } 5872 } 5873 5874 // Here we have an function template explicit specialization at class scope. 5875 // The actually specialization will be postponed to template instatiation 5876 // time via the ClassScopeFunctionSpecializationDecl node. 5877 if (isDependentClassScopeExplicitSpecialization) { 5878 ClassScopeFunctionSpecializationDecl *NewSpec = 5879 ClassScopeFunctionSpecializationDecl::Create( 5880 Context, CurContext, SourceLocation(), 5881 cast<CXXMethodDecl>(NewFD), 5882 HasExplicitTemplateArgs, TemplateArgs); 5883 CurContext->addDecl(NewSpec); 5884 AddToScope = false; 5885 } 5886 5887 return NewFD; 5888} 5889 5890/// \brief Perform semantic checking of a new function declaration. 5891/// 5892/// Performs semantic analysis of the new function declaration 5893/// NewFD. This routine performs all semantic checking that does not 5894/// require the actual declarator involved in the declaration, and is 5895/// used both for the declaration of functions as they are parsed 5896/// (called via ActOnDeclarator) and for the declaration of functions 5897/// that have been instantiated via C++ template instantiation (called 5898/// via InstantiateDecl). 5899/// 5900/// \param IsExplicitSpecialization whether this new function declaration is 5901/// an explicit specialization of the previous declaration. 5902/// 5903/// This sets NewFD->isInvalidDecl() to true if there was an error. 5904/// 5905/// \returns true if the function declaration is a redeclaration. 5906bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5907 LookupResult &Previous, 5908 bool IsExplicitSpecialization) { 5909 assert(!NewFD->getResultType()->isVariablyModifiedType() 5910 && "Variably modified return types are not handled here"); 5911 5912 // Check for a previous declaration of this name. 5913 if (Previous.empty() && NewFD->isExternC()) { 5914 // Since we did not find anything by this name and we're declaring 5915 // an extern "C" function, look for a non-visible extern "C" 5916 // declaration with the same name. 5917 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5918 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5919 if (Pos != LocallyScopedExternalDecls.end()) 5920 Previous.addDecl(Pos->second); 5921 } 5922 5923 bool Redeclaration = false; 5924 5925 // Merge or overload the declaration with an existing declaration of 5926 // the same name, if appropriate. 5927 if (!Previous.empty()) { 5928 // Determine whether NewFD is an overload of PrevDecl or 5929 // a declaration that requires merging. If it's an overload, 5930 // there's no more work to do here; we'll just add the new 5931 // function to the scope. 5932 5933 NamedDecl *OldDecl = 0; 5934 if (!AllowOverloadingOfFunction(Previous, Context)) { 5935 Redeclaration = true; 5936 OldDecl = Previous.getFoundDecl(); 5937 } else { 5938 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5939 /*NewIsUsingDecl*/ false)) { 5940 case Ovl_Match: 5941 Redeclaration = true; 5942 break; 5943 5944 case Ovl_NonFunction: 5945 Redeclaration = true; 5946 break; 5947 5948 case Ovl_Overload: 5949 Redeclaration = false; 5950 break; 5951 } 5952 5953 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5954 // If a function name is overloadable in C, then every function 5955 // with that name must be marked "overloadable". 5956 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5957 << Redeclaration << NewFD; 5958 NamedDecl *OverloadedDecl = 0; 5959 if (Redeclaration) 5960 OverloadedDecl = OldDecl; 5961 else if (!Previous.empty()) 5962 OverloadedDecl = Previous.getRepresentativeDecl(); 5963 if (OverloadedDecl) 5964 Diag(OverloadedDecl->getLocation(), 5965 diag::note_attribute_overloadable_prev_overload); 5966 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5967 Context)); 5968 } 5969 } 5970 5971 if (Redeclaration) { 5972 // NewFD and OldDecl represent declarations that need to be 5973 // merged. 5974 if (MergeFunctionDecl(NewFD, OldDecl, S)) { 5975 NewFD->setInvalidDecl(); 5976 return Redeclaration; 5977 } 5978 5979 Previous.clear(); 5980 Previous.addDecl(OldDecl); 5981 5982 if (FunctionTemplateDecl *OldTemplateDecl 5983 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5984 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5985 FunctionTemplateDecl *NewTemplateDecl 5986 = NewFD->getDescribedFunctionTemplate(); 5987 assert(NewTemplateDecl && "Template/non-template mismatch"); 5988 if (CXXMethodDecl *Method 5989 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5990 Method->setAccess(OldTemplateDecl->getAccess()); 5991 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5992 } 5993 5994 // If this is an explicit specialization of a member that is a function 5995 // template, mark it as a member specialization. 5996 if (IsExplicitSpecialization && 5997 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5998 NewTemplateDecl->setMemberSpecialization(); 5999 assert(OldTemplateDecl->isMemberSpecialization()); 6000 } 6001 6002 } else { 6003 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 6004 NewFD->setAccess(OldDecl->getAccess()); 6005 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 6006 } 6007 } 6008 } 6009 6010 // Semantic checking for this function declaration (in isolation). 6011 if (getLangOpts().CPlusPlus) { 6012 // C++-specific checks. 6013 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 6014 CheckConstructor(Constructor); 6015 } else if (CXXDestructorDecl *Destructor = 6016 dyn_cast<CXXDestructorDecl>(NewFD)) { 6017 CXXRecordDecl *Record = Destructor->getParent(); 6018 QualType ClassType = Context.getTypeDeclType(Record); 6019 6020 // FIXME: Shouldn't we be able to perform this check even when the class 6021 // type is dependent? Both gcc and edg can handle that. 6022 if (!ClassType->isDependentType()) { 6023 DeclarationName Name 6024 = Context.DeclarationNames.getCXXDestructorName( 6025 Context.getCanonicalType(ClassType)); 6026 if (NewFD->getDeclName() != Name) { 6027 Diag(NewFD->getLocation(), diag::err_destructor_name); 6028 NewFD->setInvalidDecl(); 6029 return Redeclaration; 6030 } 6031 } 6032 } else if (CXXConversionDecl *Conversion 6033 = dyn_cast<CXXConversionDecl>(NewFD)) { 6034 ActOnConversionDeclarator(Conversion); 6035 } 6036 6037 // Find any virtual functions that this function overrides. 6038 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 6039 if (!Method->isFunctionTemplateSpecialization() && 6040 !Method->getDescribedFunctionTemplate()) { 6041 if (AddOverriddenMethods(Method->getParent(), Method)) { 6042 // If the function was marked as "static", we have a problem. 6043 if (NewFD->getStorageClass() == SC_Static) { 6044 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 6045 << NewFD->getDeclName(); 6046 for (CXXMethodDecl::method_iterator 6047 Overridden = Method->begin_overridden_methods(), 6048 OverriddenEnd = Method->end_overridden_methods(); 6049 Overridden != OverriddenEnd; 6050 ++Overridden) { 6051 Diag((*Overridden)->getLocation(), 6052 diag::note_overridden_virtual_function); 6053 } 6054 } 6055 } 6056 } 6057 6058 if (Method->isStatic()) 6059 checkThisInStaticMemberFunctionType(Method); 6060 } 6061 6062 // Extra checking for C++ overloaded operators (C++ [over.oper]). 6063 if (NewFD->isOverloadedOperator() && 6064 CheckOverloadedOperatorDeclaration(NewFD)) { 6065 NewFD->setInvalidDecl(); 6066 return Redeclaration; 6067 } 6068 6069 // Extra checking for C++0x literal operators (C++0x [over.literal]). 6070 if (NewFD->getLiteralIdentifier() && 6071 CheckLiteralOperatorDeclaration(NewFD)) { 6072 NewFD->setInvalidDecl(); 6073 return Redeclaration; 6074 } 6075 6076 // In C++, check default arguments now that we have merged decls. Unless 6077 // the lexical context is the class, because in this case this is done 6078 // during delayed parsing anyway. 6079 if (!CurContext->isRecord()) 6080 CheckCXXDefaultArguments(NewFD); 6081 6082 // If this function declares a builtin function, check the type of this 6083 // declaration against the expected type for the builtin. 6084 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 6085 ASTContext::GetBuiltinTypeError Error; 6086 QualType T = Context.GetBuiltinType(BuiltinID, Error); 6087 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 6088 // The type of this function differs from the type of the builtin, 6089 // so forget about the builtin entirely. 6090 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 6091 } 6092 } 6093 6094 // If this function is declared as being extern "C", then check to see if 6095 // the function returns a UDT (class, struct, or union type) that is not C 6096 // compatible, and if it does, warn the user. 6097 if (NewFD->isExternC()) { 6098 QualType R = NewFD->getResultType(); 6099 if (R->isIncompleteType() && !R->isVoidType()) 6100 Diag(NewFD->getLocation(), diag::warn_return_value_udt_incomplete) 6101 << NewFD << R; 6102 else if (!R.isPODType(Context) && !R->isVoidType() && 6103 !R->isObjCObjectPointerType()) 6104 Diag(NewFD->getLocation(), diag::warn_return_value_udt) << NewFD << R; 6105 } 6106 } 6107 return Redeclaration; 6108} 6109 6110void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 6111 // C++11 [basic.start.main]p3: A program that declares main to be inline, 6112 // static or constexpr is ill-formed. 6113 // C99 6.7.4p4: In a hosted environment, the inline function specifier 6114 // shall not appear in a declaration of main. 6115 // static main is not an error under C99, but we should warn about it. 6116 if (FD->getStorageClass() == SC_Static) 6117 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus 6118 ? diag::err_static_main : diag::warn_static_main) 6119 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 6120 if (FD->isInlineSpecified()) 6121 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 6122 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 6123 if (FD->isConstexpr()) { 6124 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 6125 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 6126 FD->setConstexpr(false); 6127 } 6128 6129 QualType T = FD->getType(); 6130 assert(T->isFunctionType() && "function decl is not of function type"); 6131 const FunctionType* FT = T->castAs<FunctionType>(); 6132 6133 // All the standards say that main() should should return 'int'. 6134 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 6135 // In C and C++, main magically returns 0 if you fall off the end; 6136 // set the flag which tells us that. 6137 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6138 FD->setHasImplicitReturnZero(true); 6139 6140 // In C with GNU extensions we allow main() to have non-integer return 6141 // type, but we should warn about the extension, and we disable the 6142 // implicit-return-zero rule. 6143 } else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) { 6144 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); 6145 6146 // Otherwise, this is just a flat-out error. 6147 } else { 6148 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 6149 FD->setInvalidDecl(true); 6150 } 6151 6152 // Treat protoless main() as nullary. 6153 if (isa<FunctionNoProtoType>(FT)) return; 6154 6155 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 6156 unsigned nparams = FTP->getNumArgs(); 6157 assert(FD->getNumParams() == nparams); 6158 6159 bool HasExtraParameters = (nparams > 3); 6160 6161 // Darwin passes an undocumented fourth argument of type char**. If 6162 // other platforms start sprouting these, the logic below will start 6163 // getting shifty. 6164 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 6165 HasExtraParameters = false; 6166 6167 if (HasExtraParameters) { 6168 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 6169 FD->setInvalidDecl(true); 6170 nparams = 3; 6171 } 6172 6173 // FIXME: a lot of the following diagnostics would be improved 6174 // if we had some location information about types. 6175 6176 QualType CharPP = 6177 Context.getPointerType(Context.getPointerType(Context.CharTy)); 6178 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 6179 6180 for (unsigned i = 0; i < nparams; ++i) { 6181 QualType AT = FTP->getArgType(i); 6182 6183 bool mismatch = true; 6184 6185 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 6186 mismatch = false; 6187 else if (Expected[i] == CharPP) { 6188 // As an extension, the following forms are okay: 6189 // char const ** 6190 // char const * const * 6191 // char * const * 6192 6193 QualifierCollector qs; 6194 const PointerType* PT; 6195 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 6196 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 6197 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 6198 qs.removeConst(); 6199 mismatch = !qs.empty(); 6200 } 6201 } 6202 6203 if (mismatch) { 6204 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 6205 // TODO: suggest replacing given type with expected type 6206 FD->setInvalidDecl(true); 6207 } 6208 } 6209 6210 if (nparams == 1 && !FD->isInvalidDecl()) { 6211 Diag(FD->getLocation(), diag::warn_main_one_arg); 6212 } 6213 6214 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 6215 Diag(FD->getLocation(), diag::err_main_template_decl); 6216 FD->setInvalidDecl(); 6217 } 6218} 6219 6220bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 6221 // FIXME: Need strict checking. In C89, we need to check for 6222 // any assignment, increment, decrement, function-calls, or 6223 // commas outside of a sizeof. In C99, it's the same list, 6224 // except that the aforementioned are allowed in unevaluated 6225 // expressions. Everything else falls under the 6226 // "may accept other forms of constant expressions" exception. 6227 // (We never end up here for C++, so the constant expression 6228 // rules there don't matter.) 6229 if (Init->isConstantInitializer(Context, false)) 6230 return false; 6231 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 6232 << Init->getSourceRange(); 6233 return true; 6234} 6235 6236namespace { 6237 // Visits an initialization expression to see if OrigDecl is evaluated in 6238 // its own initialization and throws a warning if it does. 6239 class SelfReferenceChecker 6240 : public EvaluatedExprVisitor<SelfReferenceChecker> { 6241 Sema &S; 6242 Decl *OrigDecl; 6243 bool isRecordType; 6244 bool isPODType; 6245 bool isReferenceType; 6246 6247 public: 6248 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 6249 6250 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 6251 S(S), OrigDecl(OrigDecl) { 6252 isPODType = false; 6253 isRecordType = false; 6254 isReferenceType = false; 6255 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 6256 isPODType = VD->getType().isPODType(S.Context); 6257 isRecordType = VD->getType()->isRecordType(); 6258 isReferenceType = VD->getType()->isReferenceType(); 6259 } 6260 } 6261 6262 // For most expressions, the cast is directly above the DeclRefExpr. 6263 // For conditional operators, the cast can be outside the conditional 6264 // operator if both expressions are DeclRefExpr's. 6265 void HandleValue(Expr *E) { 6266 if (isReferenceType) 6267 return; 6268 E = E->IgnoreParenImpCasts(); 6269 if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) { 6270 HandleDeclRefExpr(DRE); 6271 return; 6272 } 6273 6274 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 6275 HandleValue(CO->getTrueExpr()); 6276 HandleValue(CO->getFalseExpr()); 6277 } 6278 } 6279 6280 // Reference types are handled here since all uses of references are 6281 // bad, not just r-value uses. 6282 void VisitDeclRefExpr(DeclRefExpr *E) { 6283 if (isReferenceType) 6284 HandleDeclRefExpr(E); 6285 } 6286 6287 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 6288 if ((!isRecordType && E->getCastKind() == CK_LValueToRValue) || 6289 (isRecordType && E->getCastKind() == CK_NoOp)) 6290 HandleValue(E->getSubExpr()); 6291 6292 Inherited::VisitImplicitCastExpr(E); 6293 } 6294 6295 void VisitMemberExpr(MemberExpr *E) { 6296 // Don't warn on arrays since they can be treated as pointers. 6297 if (E->getType()->canDecayToPointerType()) return; 6298 6299 ValueDecl *VD = E->getMemberDecl(); 6300 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(VD); 6301 if (isa<FieldDecl>(VD) || (MD && !MD->isStatic())) 6302 if (DeclRefExpr *DRE 6303 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 6304 HandleDeclRefExpr(DRE); 6305 return; 6306 } 6307 6308 Inherited::VisitMemberExpr(E); 6309 } 6310 6311 void VisitUnaryOperator(UnaryOperator *E) { 6312 // For POD record types, addresses of its own members are well-defined. 6313 if (E->getOpcode() == UO_AddrOf && isRecordType && isPODType && 6314 isa<MemberExpr>(E->getSubExpr()->IgnoreParens())) return; 6315 Inherited::VisitUnaryOperator(E); 6316 } 6317 6318 void VisitObjCMessageExpr(ObjCMessageExpr *E) { return; } 6319 6320 void HandleDeclRefExpr(DeclRefExpr *DRE) { 6321 Decl* ReferenceDecl = DRE->getDecl(); 6322 if (OrigDecl != ReferenceDecl) return; 6323 unsigned diag = isReferenceType 6324 ? diag::warn_uninit_self_reference_in_reference_init 6325 : diag::warn_uninit_self_reference_in_init; 6326 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 6327 S.PDiag(diag) 6328 << DRE->getNameInfo().getName() 6329 << OrigDecl->getLocation() 6330 << DRE->getSourceRange()); 6331 } 6332 }; 6333 6334 /// CheckSelfReference - Warns if OrigDecl is used in expression E. 6335 static void CheckSelfReference(Sema &S, Decl* OrigDecl, Expr *E, 6336 bool DirectInit) { 6337 // Parameters arguments are occassionially constructed with itself, 6338 // for instance, in recursive functions. Skip them. 6339 if (isa<ParmVarDecl>(OrigDecl)) 6340 return; 6341 6342 E = E->IgnoreParens(); 6343 6344 // Skip checking T a = a where T is not a record or reference type. 6345 // Doing so is a way to silence uninitialized warnings. 6346 if (!DirectInit && !cast<VarDecl>(OrigDecl)->getType()->isRecordType()) 6347 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 6348 if (ICE->getCastKind() == CK_LValueToRValue) 6349 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr())) 6350 if (DRE->getDecl() == OrigDecl) 6351 return; 6352 6353 SelfReferenceChecker(S, OrigDecl).Visit(E); 6354 } 6355} 6356 6357/// AddInitializerToDecl - Adds the initializer Init to the 6358/// declaration dcl. If DirectInit is true, this is C++ direct 6359/// initialization rather than copy initialization. 6360void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 6361 bool DirectInit, bool TypeMayContainAuto) { 6362 // If there is no declaration, there was an error parsing it. Just ignore 6363 // the initializer. 6364 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 6365 return; 6366 6367 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6368 // With declarators parsed the way they are, the parser cannot 6369 // distinguish between a normal initializer and a pure-specifier. 6370 // Thus this grotesque test. 6371 IntegerLiteral *IL; 6372 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6373 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6374 CheckPureMethod(Method, Init->getSourceRange()); 6375 else { 6376 Diag(Method->getLocation(), diag::err_member_function_initialization) 6377 << Method->getDeclName() << Init->getSourceRange(); 6378 Method->setInvalidDecl(); 6379 } 6380 return; 6381 } 6382 6383 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6384 if (!VDecl) { 6385 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6386 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6387 RealDecl->setInvalidDecl(); 6388 return; 6389 } 6390 6391 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); 6392 6393 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6394 AutoType *Auto = 0; 6395 if (TypeMayContainAuto && 6396 (Auto = VDecl->getType()->getContainedAutoType()) && 6397 !Auto->isDeduced()) { 6398 Expr *DeduceInit = Init; 6399 // Initializer could be a C++ direct-initializer. Deduction only works if it 6400 // contains exactly one expression. 6401 if (CXXDirectInit) { 6402 if (CXXDirectInit->getNumExprs() == 0) { 6403 // It isn't possible to write this directly, but it is possible to 6404 // end up in this situation with "auto x(some_pack...);" 6405 Diag(CXXDirectInit->getLocStart(), 6406 diag::err_auto_var_init_no_expression) 6407 << VDecl->getDeclName() << VDecl->getType() 6408 << VDecl->getSourceRange(); 6409 RealDecl->setInvalidDecl(); 6410 return; 6411 } else if (CXXDirectInit->getNumExprs() > 1) { 6412 Diag(CXXDirectInit->getExpr(1)->getLocStart(), 6413 diag::err_auto_var_init_multiple_expressions) 6414 << VDecl->getDeclName() << VDecl->getType() 6415 << VDecl->getSourceRange(); 6416 RealDecl->setInvalidDecl(); 6417 return; 6418 } else { 6419 DeduceInit = CXXDirectInit->getExpr(0); 6420 } 6421 } 6422 TypeSourceInfo *DeducedType = 0; 6423 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) == 6424 DAR_Failed) 6425 DiagnoseAutoDeductionFailure(VDecl, DeduceInit); 6426 if (!DeducedType) { 6427 RealDecl->setInvalidDecl(); 6428 return; 6429 } 6430 VDecl->setTypeSourceInfo(DeducedType); 6431 VDecl->setType(DeducedType->getType()); 6432 VDecl->ClearLinkageCache(); 6433 6434 // In ARC, infer lifetime. 6435 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6436 VDecl->setInvalidDecl(); 6437 6438 // Warn if we deduced 'id'. 'auto' usually implies type-safety, but using 6439 // 'id' instead of a specific object type prevents most of our usual checks. 6440 // We only want to warn outside of template instantiations, though: 6441 // inside a template, the 'id' could have come from a parameter. 6442 if (ActiveTemplateInstantiations.empty() && 6443 DeducedType->getType()->isObjCIdType()) { 6444 SourceLocation Loc = DeducedType->getTypeLoc().getBeginLoc(); 6445 Diag(Loc, diag::warn_auto_var_is_id) 6446 << VDecl->getDeclName() << DeduceInit->getSourceRange(); 6447 } 6448 6449 // If this is a redeclaration, check that the type we just deduced matches 6450 // the previously declared type. 6451 if (VarDecl *Old = VDecl->getPreviousDecl()) 6452 MergeVarDeclTypes(VDecl, Old); 6453 } 6454 6455 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6456 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6457 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6458 VDecl->setInvalidDecl(); 6459 return; 6460 } 6461 6462 if (!VDecl->getType()->isDependentType()) { 6463 // A definition must end up with a complete type, which means it must be 6464 // complete with the restriction that an array type might be completed by 6465 // the initializer; note that later code assumes this restriction. 6466 QualType BaseDeclType = VDecl->getType(); 6467 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6468 BaseDeclType = Array->getElementType(); 6469 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6470 diag::err_typecheck_decl_incomplete_type)) { 6471 RealDecl->setInvalidDecl(); 6472 return; 6473 } 6474 6475 // The variable can not have an abstract class type. 6476 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6477 diag::err_abstract_type_in_decl, 6478 AbstractVariableType)) 6479 VDecl->setInvalidDecl(); 6480 } 6481 6482 const VarDecl *Def; 6483 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6484 Diag(VDecl->getLocation(), diag::err_redefinition) 6485 << VDecl->getDeclName(); 6486 Diag(Def->getLocation(), diag::note_previous_definition); 6487 VDecl->setInvalidDecl(); 6488 return; 6489 } 6490 6491 const VarDecl* PrevInit = 0; 6492 if (getLangOpts().CPlusPlus) { 6493 // C++ [class.static.data]p4 6494 // If a static data member is of const integral or const 6495 // enumeration type, its declaration in the class definition can 6496 // specify a constant-initializer which shall be an integral 6497 // constant expression (5.19). In that case, the member can appear 6498 // in integral constant expressions. The member shall still be 6499 // defined in a namespace scope if it is used in the program and the 6500 // namespace scope definition shall not contain an initializer. 6501 // 6502 // We already performed a redefinition check above, but for static 6503 // data members we also need to check whether there was an in-class 6504 // declaration with an initializer. 6505 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6506 Diag(VDecl->getLocation(), diag::err_redefinition) 6507 << VDecl->getDeclName(); 6508 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6509 return; 6510 } 6511 6512 if (VDecl->hasLocalStorage()) 6513 getCurFunction()->setHasBranchProtectedScope(); 6514 6515 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6516 VDecl->setInvalidDecl(); 6517 return; 6518 } 6519 } 6520 6521 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6522 // a kernel function cannot be initialized." 6523 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6524 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6525 VDecl->setInvalidDecl(); 6526 return; 6527 } 6528 6529 // Get the decls type and save a reference for later, since 6530 // CheckInitializerTypes may change it. 6531 QualType DclT = VDecl->getType(), SavT = DclT; 6532 6533 // Top-level message sends default to 'id' when we're in a debugger 6534 // and we are assigning it to a variable of 'id' type. 6535 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCIdType()) 6536 if (Init->getType() == Context.UnknownAnyTy && isa<ObjCMessageExpr>(Init)) { 6537 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); 6538 if (Result.isInvalid()) { 6539 VDecl->setInvalidDecl(); 6540 return; 6541 } 6542 Init = Result.take(); 6543 } 6544 6545 // Perform the initialization. 6546 if (!VDecl->isInvalidDecl()) { 6547 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6548 InitializationKind Kind 6549 = DirectInit ? 6550 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6551 Init->getLocStart(), 6552 Init->getLocEnd()) 6553 : InitializationKind::CreateDirectList( 6554 VDecl->getLocation()) 6555 : InitializationKind::CreateCopy(VDecl->getLocation(), 6556 Init->getLocStart()); 6557 6558 Expr **Args = &Init; 6559 unsigned NumArgs = 1; 6560 if (CXXDirectInit) { 6561 Args = CXXDirectInit->getExprs(); 6562 NumArgs = CXXDirectInit->getNumExprs(); 6563 } 6564 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs); 6565 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6566 MultiExprArg(Args, NumArgs), &DclT); 6567 if (Result.isInvalid()) { 6568 VDecl->setInvalidDecl(); 6569 return; 6570 } 6571 6572 Init = Result.takeAs<Expr>(); 6573 } 6574 6575 // Check for self-references within variable initializers. 6576 // Variables declared within a function/method body (except for references) 6577 // are handled by a dataflow analysis. 6578 if (!VDecl->hasLocalStorage() || VDecl->getType()->isRecordType() || 6579 VDecl->getType()->isReferenceType()) { 6580 CheckSelfReference(*this, RealDecl, Init, DirectInit); 6581 } 6582 6583 // If the type changed, it means we had an incomplete type that was 6584 // completed by the initializer. For example: 6585 // int ary[] = { 1, 3, 5 }; 6586 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6587 if (!VDecl->isInvalidDecl() && (DclT != SavT)) 6588 VDecl->setType(DclT); 6589 6590 // Check any implicit conversions within the expression. 6591 CheckImplicitConversions(Init, VDecl->getLocation()); 6592 6593 if (!VDecl->isInvalidDecl()) { 6594 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6595 6596 if (VDecl->hasAttr<BlocksAttr>()) 6597 checkRetainCycles(VDecl, Init); 6598 6599 // It is safe to assign a weak reference into a strong variable. 6600 // Although this code can still have problems: 6601 // id x = self.weakProp; 6602 // id y = self.weakProp; 6603 // we do not warn to warn spuriously when 'x' and 'y' are on separate 6604 // paths through the function. This should be revisited if 6605 // -Wrepeated-use-of-weak is made flow-sensitive. 6606 if (VDecl->getType().getObjCLifetime() == Qualifiers::OCL_Strong) { 6607 DiagnosticsEngine::Level Level = 6608 Diags.getDiagnosticLevel(diag::warn_arc_repeated_use_of_weak, 6609 Init->getLocStart()); 6610 if (Level != DiagnosticsEngine::Ignored) 6611 getCurFunction()->markSafeWeakUse(Init); 6612 } 6613 } 6614 6615 Init = MaybeCreateExprWithCleanups(Init); 6616 // Attach the initializer to the decl. 6617 VDecl->setInit(Init); 6618 6619 if (VDecl->isLocalVarDecl()) { 6620 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6621 // static storage duration shall be constant expressions or string literals. 6622 // C++ does not have this restriction. 6623 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() && 6624 VDecl->getStorageClass() == SC_Static) 6625 CheckForConstantInitializer(Init, DclT); 6626 } else if (VDecl->isStaticDataMember() && 6627 VDecl->getLexicalDeclContext()->isRecord()) { 6628 // This is an in-class initialization for a static data member, e.g., 6629 // 6630 // struct S { 6631 // static const int value = 17; 6632 // }; 6633 6634 // C++ [class.mem]p4: 6635 // A member-declarator can contain a constant-initializer only 6636 // if it declares a static member (9.4) of const integral or 6637 // const enumeration type, see 9.4.2. 6638 // 6639 // C++11 [class.static.data]p3: 6640 // If a non-volatile const static data member is of integral or 6641 // enumeration type, its declaration in the class definition can 6642 // specify a brace-or-equal-initializer in which every initalizer-clause 6643 // that is an assignment-expression is a constant expression. A static 6644 // data member of literal type can be declared in the class definition 6645 // with the constexpr specifier; if so, its declaration shall specify a 6646 // brace-or-equal-initializer in which every initializer-clause that is 6647 // an assignment-expression is a constant expression. 6648 6649 // Do nothing on dependent types. 6650 if (DclT->isDependentType()) { 6651 6652 // Allow any 'static constexpr' members, whether or not they are of literal 6653 // type. We separately check that every constexpr variable is of literal 6654 // type. 6655 } else if (VDecl->isConstexpr()) { 6656 6657 // Require constness. 6658 } else if (!DclT.isConstQualified()) { 6659 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6660 << Init->getSourceRange(); 6661 VDecl->setInvalidDecl(); 6662 6663 // We allow integer constant expressions in all cases. 6664 } else if (DclT->isIntegralOrEnumerationType()) { 6665 // Check whether the expression is a constant expression. 6666 SourceLocation Loc; 6667 if (getLangOpts().CPlusPlus0x && DclT.isVolatileQualified()) 6668 // In C++11, a non-constexpr const static data member with an 6669 // in-class initializer cannot be volatile. 6670 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6671 else if (Init->isValueDependent()) 6672 ; // Nothing to check. 6673 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6674 ; // Ok, it's an ICE! 6675 else if (Init->isEvaluatable(Context)) { 6676 // If we can constant fold the initializer through heroics, accept it, 6677 // but report this as a use of an extension for -pedantic. 6678 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6679 << Init->getSourceRange(); 6680 } else { 6681 // Otherwise, this is some crazy unknown case. Report the issue at the 6682 // location provided by the isIntegerConstantExpr failed check. 6683 Diag(Loc, diag::err_in_class_initializer_non_constant) 6684 << Init->getSourceRange(); 6685 VDecl->setInvalidDecl(); 6686 } 6687 6688 // We allow foldable floating-point constants as an extension. 6689 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6690 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6691 << DclT << Init->getSourceRange(); 6692 if (getLangOpts().CPlusPlus0x) 6693 Diag(VDecl->getLocation(), 6694 diag::note_in_class_initializer_float_type_constexpr) 6695 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6696 6697 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6698 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6699 << Init->getSourceRange(); 6700 VDecl->setInvalidDecl(); 6701 } 6702 6703 // Suggest adding 'constexpr' in C++11 for literal types. 6704 } else if (getLangOpts().CPlusPlus0x && DclT->isLiteralType()) { 6705 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6706 << DclT << Init->getSourceRange() 6707 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6708 VDecl->setConstexpr(true); 6709 6710 } else { 6711 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6712 << DclT << Init->getSourceRange(); 6713 VDecl->setInvalidDecl(); 6714 } 6715 } else if (VDecl->isFileVarDecl()) { 6716 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6717 (!getLangOpts().CPlusPlus || 6718 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6719 Diag(VDecl->getLocation(), diag::warn_extern_init); 6720 6721 // C99 6.7.8p4. All file scoped initializers need to be constant. 6722 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) 6723 CheckForConstantInitializer(Init, DclT); 6724 } 6725 6726 // We will represent direct-initialization similarly to copy-initialization: 6727 // int x(1); -as-> int x = 1; 6728 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6729 // 6730 // Clients that want to distinguish between the two forms, can check for 6731 // direct initializer using VarDecl::getInitStyle(). 6732 // A major benefit is that clients that don't particularly care about which 6733 // exactly form was it (like the CodeGen) can handle both cases without 6734 // special case code. 6735 6736 // C++ 8.5p11: 6737 // The form of initialization (using parentheses or '=') is generally 6738 // insignificant, but does matter when the entity being initialized has a 6739 // class type. 6740 if (CXXDirectInit) { 6741 assert(DirectInit && "Call-style initializer must be direct init."); 6742 VDecl->setInitStyle(VarDecl::CallInit); 6743 } else if (DirectInit) { 6744 // This must be list-initialization. No other way is direct-initialization. 6745 VDecl->setInitStyle(VarDecl::ListInit); 6746 } 6747 6748 CheckCompleteVariableDeclaration(VDecl); 6749} 6750 6751/// ActOnInitializerError - Given that there was an error parsing an 6752/// initializer for the given declaration, try to return to some form 6753/// of sanity. 6754void Sema::ActOnInitializerError(Decl *D) { 6755 // Our main concern here is re-establishing invariants like "a 6756 // variable's type is either dependent or complete". 6757 if (!D || D->isInvalidDecl()) return; 6758 6759 VarDecl *VD = dyn_cast<VarDecl>(D); 6760 if (!VD) return; 6761 6762 // Auto types are meaningless if we can't make sense of the initializer. 6763 if (ParsingInitForAutoVars.count(D)) { 6764 D->setInvalidDecl(); 6765 return; 6766 } 6767 6768 QualType Ty = VD->getType(); 6769 if (Ty->isDependentType()) return; 6770 6771 // Require a complete type. 6772 if (RequireCompleteType(VD->getLocation(), 6773 Context.getBaseElementType(Ty), 6774 diag::err_typecheck_decl_incomplete_type)) { 6775 VD->setInvalidDecl(); 6776 return; 6777 } 6778 6779 // Require an abstract type. 6780 if (RequireNonAbstractType(VD->getLocation(), Ty, 6781 diag::err_abstract_type_in_decl, 6782 AbstractVariableType)) { 6783 VD->setInvalidDecl(); 6784 return; 6785 } 6786 6787 // Don't bother complaining about constructors or destructors, 6788 // though. 6789} 6790 6791void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6792 bool TypeMayContainAuto) { 6793 // If there is no declaration, there was an error parsing it. Just ignore it. 6794 if (RealDecl == 0) 6795 return; 6796 6797 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6798 QualType Type = Var->getType(); 6799 6800 // C++11 [dcl.spec.auto]p3 6801 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6802 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6803 << Var->getDeclName() << Type; 6804 Var->setInvalidDecl(); 6805 return; 6806 } 6807 6808 // C++11 [class.static.data]p3: A static data member can be declared with 6809 // the constexpr specifier; if so, its declaration shall specify 6810 // a brace-or-equal-initializer. 6811 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6812 // the definition of a variable [...] or the declaration of a static data 6813 // member. 6814 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6815 if (Var->isStaticDataMember()) 6816 Diag(Var->getLocation(), 6817 diag::err_constexpr_static_mem_var_requires_init) 6818 << Var->getDeclName(); 6819 else 6820 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6821 Var->setInvalidDecl(); 6822 return; 6823 } 6824 6825 switch (Var->isThisDeclarationADefinition()) { 6826 case VarDecl::Definition: 6827 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6828 break; 6829 6830 // We have an out-of-line definition of a static data member 6831 // that has an in-class initializer, so we type-check this like 6832 // a declaration. 6833 // 6834 // Fall through 6835 6836 case VarDecl::DeclarationOnly: 6837 // It's only a declaration. 6838 6839 // Block scope. C99 6.7p7: If an identifier for an object is 6840 // declared with no linkage (C99 6.2.2p6), the type for the 6841 // object shall be complete. 6842 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6843 !Var->getLinkage() && !Var->isInvalidDecl() && 6844 RequireCompleteType(Var->getLocation(), Type, 6845 diag::err_typecheck_decl_incomplete_type)) 6846 Var->setInvalidDecl(); 6847 6848 // Make sure that the type is not abstract. 6849 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6850 RequireNonAbstractType(Var->getLocation(), Type, 6851 diag::err_abstract_type_in_decl, 6852 AbstractVariableType)) 6853 Var->setInvalidDecl(); 6854 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6855 Var->getStorageClass() == SC_PrivateExtern) { 6856 Diag(Var->getLocation(), diag::warn_private_extern); 6857 Diag(Var->getLocation(), diag::note_private_extern); 6858 } 6859 6860 return; 6861 6862 case VarDecl::TentativeDefinition: 6863 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6864 // object that has file scope without an initializer, and without a 6865 // storage-class specifier or with the storage-class specifier "static", 6866 // constitutes a tentative definition. Note: A tentative definition with 6867 // external linkage is valid (C99 6.2.2p5). 6868 if (!Var->isInvalidDecl()) { 6869 if (const IncompleteArrayType *ArrayT 6870 = Context.getAsIncompleteArrayType(Type)) { 6871 if (RequireCompleteType(Var->getLocation(), 6872 ArrayT->getElementType(), 6873 diag::err_illegal_decl_array_incomplete_type)) 6874 Var->setInvalidDecl(); 6875 } else if (Var->getStorageClass() == SC_Static) { 6876 // C99 6.9.2p3: If the declaration of an identifier for an object is 6877 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6878 // declared type shall not be an incomplete type. 6879 // NOTE: code such as the following 6880 // static struct s; 6881 // struct s { int a; }; 6882 // is accepted by gcc. Hence here we issue a warning instead of 6883 // an error and we do not invalidate the static declaration. 6884 // NOTE: to avoid multiple warnings, only check the first declaration. 6885 if (Var->getPreviousDecl() == 0) 6886 RequireCompleteType(Var->getLocation(), Type, 6887 diag::ext_typecheck_decl_incomplete_type); 6888 } 6889 } 6890 6891 // Record the tentative definition; we're done. 6892 if (!Var->isInvalidDecl()) 6893 TentativeDefinitions.push_back(Var); 6894 return; 6895 } 6896 6897 // Provide a specific diagnostic for uninitialized variable 6898 // definitions with incomplete array type. 6899 if (Type->isIncompleteArrayType()) { 6900 Diag(Var->getLocation(), 6901 diag::err_typecheck_incomplete_array_needs_initializer); 6902 Var->setInvalidDecl(); 6903 return; 6904 } 6905 6906 // Provide a specific diagnostic for uninitialized variable 6907 // definitions with reference type. 6908 if (Type->isReferenceType()) { 6909 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6910 << Var->getDeclName() 6911 << SourceRange(Var->getLocation(), Var->getLocation()); 6912 Var->setInvalidDecl(); 6913 return; 6914 } 6915 6916 // Do not attempt to type-check the default initializer for a 6917 // variable with dependent type. 6918 if (Type->isDependentType()) 6919 return; 6920 6921 if (Var->isInvalidDecl()) 6922 return; 6923 6924 if (RequireCompleteType(Var->getLocation(), 6925 Context.getBaseElementType(Type), 6926 diag::err_typecheck_decl_incomplete_type)) { 6927 Var->setInvalidDecl(); 6928 return; 6929 } 6930 6931 // The variable can not have an abstract class type. 6932 if (RequireNonAbstractType(Var->getLocation(), Type, 6933 diag::err_abstract_type_in_decl, 6934 AbstractVariableType)) { 6935 Var->setInvalidDecl(); 6936 return; 6937 } 6938 6939 // Check for jumps past the implicit initializer. C++0x 6940 // clarifies that this applies to a "variable with automatic 6941 // storage duration", not a "local variable". 6942 // C++11 [stmt.dcl]p3 6943 // A program that jumps from a point where a variable with automatic 6944 // storage duration is not in scope to a point where it is in scope is 6945 // ill-formed unless the variable has scalar type, class type with a 6946 // trivial default constructor and a trivial destructor, a cv-qualified 6947 // version of one of these types, or an array of one of the preceding 6948 // types and is declared without an initializer. 6949 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) { 6950 if (const RecordType *Record 6951 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6952 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6953 // Mark the function for further checking even if the looser rules of 6954 // C++11 do not require such checks, so that we can diagnose 6955 // incompatibilities with C++98. 6956 if (!CXXRecord->isPOD()) 6957 getCurFunction()->setHasBranchProtectedScope(); 6958 } 6959 } 6960 6961 // C++03 [dcl.init]p9: 6962 // If no initializer is specified for an object, and the 6963 // object is of (possibly cv-qualified) non-POD class type (or 6964 // array thereof), the object shall be default-initialized; if 6965 // the object is of const-qualified type, the underlying class 6966 // type shall have a user-declared default 6967 // constructor. Otherwise, if no initializer is specified for 6968 // a non- static object, the object and its subobjects, if 6969 // any, have an indeterminate initial value); if the object 6970 // or any of its subobjects are of const-qualified type, the 6971 // program is ill-formed. 6972 // C++0x [dcl.init]p11: 6973 // If no initializer is specified for an object, the object is 6974 // default-initialized; [...]. 6975 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6976 InitializationKind Kind 6977 = InitializationKind::CreateDefault(Var->getLocation()); 6978 6979 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6980 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, MultiExprArg()); 6981 if (Init.isInvalid()) 6982 Var->setInvalidDecl(); 6983 else if (Init.get()) { 6984 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6985 // This is important for template substitution. 6986 Var->setInitStyle(VarDecl::CallInit); 6987 } 6988 6989 CheckCompleteVariableDeclaration(Var); 6990 } 6991} 6992 6993void Sema::ActOnCXXForRangeDecl(Decl *D) { 6994 VarDecl *VD = dyn_cast<VarDecl>(D); 6995 if (!VD) { 6996 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6997 D->setInvalidDecl(); 6998 return; 6999 } 7000 7001 VD->setCXXForRangeDecl(true); 7002 7003 // for-range-declaration cannot be given a storage class specifier. 7004 int Error = -1; 7005 switch (VD->getStorageClassAsWritten()) { 7006 case SC_None: 7007 break; 7008 case SC_Extern: 7009 Error = 0; 7010 break; 7011 case SC_Static: 7012 Error = 1; 7013 break; 7014 case SC_PrivateExtern: 7015 Error = 2; 7016 break; 7017 case SC_Auto: 7018 Error = 3; 7019 break; 7020 case SC_Register: 7021 Error = 4; 7022 break; 7023 case SC_OpenCLWorkGroupLocal: 7024 llvm_unreachable("Unexpected storage class"); 7025 } 7026 if (VD->isConstexpr()) 7027 Error = 5; 7028 if (Error != -1) { 7029 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 7030 << VD->getDeclName() << Error; 7031 D->setInvalidDecl(); 7032 } 7033} 7034 7035void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 7036 if (var->isInvalidDecl()) return; 7037 7038 // In ARC, don't allow jumps past the implicit initialization of a 7039 // local retaining variable. 7040 if (getLangOpts().ObjCAutoRefCount && 7041 var->hasLocalStorage()) { 7042 switch (var->getType().getObjCLifetime()) { 7043 case Qualifiers::OCL_None: 7044 case Qualifiers::OCL_ExplicitNone: 7045 case Qualifiers::OCL_Autoreleasing: 7046 break; 7047 7048 case Qualifiers::OCL_Weak: 7049 case Qualifiers::OCL_Strong: 7050 getCurFunction()->setHasBranchProtectedScope(); 7051 break; 7052 } 7053 } 7054 7055 // All the following checks are C++ only. 7056 if (!getLangOpts().CPlusPlus) return; 7057 7058 QualType baseType = Context.getBaseElementType(var->getType()); 7059 if (baseType->isDependentType()) return; 7060 7061 // __block variables might require us to capture a copy-initializer. 7062 if (var->hasAttr<BlocksAttr>()) { 7063 // It's currently invalid to ever have a __block variable with an 7064 // array type; should we diagnose that here? 7065 7066 // Regardless, we don't want to ignore array nesting when 7067 // constructing this copy. 7068 QualType type = var->getType(); 7069 7070 if (type->isStructureOrClassType()) { 7071 SourceLocation poi = var->getLocation(); 7072 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi); 7073 ExprResult result = 7074 PerformCopyInitialization( 7075 InitializedEntity::InitializeBlock(poi, type, false), 7076 poi, Owned(varRef)); 7077 if (!result.isInvalid()) { 7078 result = MaybeCreateExprWithCleanups(result); 7079 Expr *init = result.takeAs<Expr>(); 7080 Context.setBlockVarCopyInits(var, init); 7081 } 7082 } 7083 } 7084 7085 Expr *Init = var->getInit(); 7086 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 7087 7088 if (!var->getDeclContext()->isDependentContext() && Init) { 7089 if (IsGlobal && !var->isConstexpr() && 7090 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 7091 var->getLocation()) 7092 != DiagnosticsEngine::Ignored && 7093 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 7094 Diag(var->getLocation(), diag::warn_global_constructor) 7095 << Init->getSourceRange(); 7096 7097 if (var->isConstexpr()) { 7098 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 7099 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 7100 SourceLocation DiagLoc = var->getLocation(); 7101 // If the note doesn't add any useful information other than a source 7102 // location, fold it into the primary diagnostic. 7103 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 7104 diag::note_invalid_subexpr_in_const_expr) { 7105 DiagLoc = Notes[0].first; 7106 Notes.clear(); 7107 } 7108 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 7109 << var << Init->getSourceRange(); 7110 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 7111 Diag(Notes[I].first, Notes[I].second); 7112 } 7113 } else if (var->isUsableInConstantExpressions(Context)) { 7114 // Check whether the initializer of a const variable of integral or 7115 // enumeration type is an ICE now, since we can't tell whether it was 7116 // initialized by a constant expression if we check later. 7117 var->checkInitIsICE(); 7118 } 7119 } 7120 7121 // Require the destructor. 7122 if (const RecordType *recordType = baseType->getAs<RecordType>()) 7123 FinalizeVarWithDestructor(var, recordType); 7124} 7125 7126/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 7127/// any semantic actions necessary after any initializer has been attached. 7128void 7129Sema::FinalizeDeclaration(Decl *ThisDecl) { 7130 // Note that we are no longer parsing the initializer for this declaration. 7131 ParsingInitForAutoVars.erase(ThisDecl); 7132 7133 // Now we have parsed the initializer and can update the table of magic 7134 // tag values. 7135 if (ThisDecl && ThisDecl->hasAttr<TypeTagForDatatypeAttr>()) { 7136 const VarDecl *VD = dyn_cast<VarDecl>(ThisDecl); 7137 if (VD && VD->getType()->isIntegralOrEnumerationType()) { 7138 for (specific_attr_iterator<TypeTagForDatatypeAttr> 7139 I = ThisDecl->specific_attr_begin<TypeTagForDatatypeAttr>(), 7140 E = ThisDecl->specific_attr_end<TypeTagForDatatypeAttr>(); 7141 I != E; ++I) { 7142 const Expr *MagicValueExpr = VD->getInit(); 7143 if (!MagicValueExpr) { 7144 continue; 7145 } 7146 llvm::APSInt MagicValueInt; 7147 if (!MagicValueExpr->isIntegerConstantExpr(MagicValueInt, Context)) { 7148 Diag(I->getRange().getBegin(), 7149 diag::err_type_tag_for_datatype_not_ice) 7150 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange(); 7151 continue; 7152 } 7153 if (MagicValueInt.getActiveBits() > 64) { 7154 Diag(I->getRange().getBegin(), 7155 diag::err_type_tag_for_datatype_too_large) 7156 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange(); 7157 continue; 7158 } 7159 uint64_t MagicValue = MagicValueInt.getZExtValue(); 7160 RegisterTypeTagForDatatype(I->getArgumentKind(), 7161 MagicValue, 7162 I->getMatchingCType(), 7163 I->getLayoutCompatible(), 7164 I->getMustBeNull()); 7165 } 7166 } 7167 } 7168} 7169 7170Sema::DeclGroupPtrTy 7171Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 7172 Decl **Group, unsigned NumDecls) { 7173 SmallVector<Decl*, 8> Decls; 7174 7175 if (DS.isTypeSpecOwned()) 7176 Decls.push_back(DS.getRepAsDecl()); 7177 7178 for (unsigned i = 0; i != NumDecls; ++i) 7179 if (Decl *D = Group[i]) 7180 Decls.push_back(D); 7181 7182 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 7183 DS.getTypeSpecType() == DeclSpec::TST_auto); 7184} 7185 7186/// BuildDeclaratorGroup - convert a list of declarations into a declaration 7187/// group, performing any necessary semantic checking. 7188Sema::DeclGroupPtrTy 7189Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 7190 bool TypeMayContainAuto) { 7191 // C++0x [dcl.spec.auto]p7: 7192 // If the type deduced for the template parameter U is not the same in each 7193 // deduction, the program is ill-formed. 7194 // FIXME: When initializer-list support is added, a distinction is needed 7195 // between the deduced type U and the deduced type which 'auto' stands for. 7196 // auto a = 0, b = { 1, 2, 3 }; 7197 // is legal because the deduced type U is 'int' in both cases. 7198 if (TypeMayContainAuto && NumDecls > 1) { 7199 QualType Deduced; 7200 CanQualType DeducedCanon; 7201 VarDecl *DeducedDecl = 0; 7202 for (unsigned i = 0; i != NumDecls; ++i) { 7203 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 7204 AutoType *AT = D->getType()->getContainedAutoType(); 7205 // Don't reissue diagnostics when instantiating a template. 7206 if (AT && D->isInvalidDecl()) 7207 break; 7208 if (AT && AT->isDeduced()) { 7209 QualType U = AT->getDeducedType(); 7210 CanQualType UCanon = Context.getCanonicalType(U); 7211 if (Deduced.isNull()) { 7212 Deduced = U; 7213 DeducedCanon = UCanon; 7214 DeducedDecl = D; 7215 } else if (DeducedCanon != UCanon) { 7216 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 7217 diag::err_auto_different_deductions) 7218 << Deduced << DeducedDecl->getDeclName() 7219 << U << D->getDeclName() 7220 << DeducedDecl->getInit()->getSourceRange() 7221 << D->getInit()->getSourceRange(); 7222 D->setInvalidDecl(); 7223 break; 7224 } 7225 } 7226 } 7227 } 7228 } 7229 7230 ActOnDocumentableDecls(Group, NumDecls); 7231 7232 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 7233} 7234 7235void Sema::ActOnDocumentableDecl(Decl *D) { 7236 ActOnDocumentableDecls(&D, 1); 7237} 7238 7239void Sema::ActOnDocumentableDecls(Decl **Group, unsigned NumDecls) { 7240 // Don't parse the comment if Doxygen diagnostics are ignored. 7241 if (NumDecls == 0 || !Group[0]) 7242 return; 7243 7244 if (Diags.getDiagnosticLevel(diag::warn_doc_param_not_found, 7245 Group[0]->getLocation()) 7246 == DiagnosticsEngine::Ignored) 7247 return; 7248 7249 if (NumDecls >= 2) { 7250 // This is a decl group. Normally it will contain only declarations 7251 // procuded from declarator list. But in case we have any definitions or 7252 // additional declaration references: 7253 // 'typedef struct S {} S;' 7254 // 'typedef struct S *S;' 7255 // 'struct S *pS;' 7256 // FinalizeDeclaratorGroup adds these as separate declarations. 7257 Decl *MaybeTagDecl = Group[0]; 7258 if (MaybeTagDecl && isa<TagDecl>(MaybeTagDecl)) { 7259 Group++; 7260 NumDecls--; 7261 } 7262 } 7263 7264 // See if there are any new comments that are not attached to a decl. 7265 ArrayRef<RawComment *> Comments = Context.getRawCommentList().getComments(); 7266 if (!Comments.empty() && 7267 !Comments.back()->isAttached()) { 7268 // There is at least one comment that not attached to a decl. 7269 // Maybe it should be attached to one of these decls? 7270 // 7271 // Note that this way we pick up not only comments that precede the 7272 // declaration, but also comments that *follow* the declaration -- thanks to 7273 // the lookahead in the lexer: we've consumed the semicolon and looked 7274 // ahead through comments. 7275 for (unsigned i = 0; i != NumDecls; ++i) 7276 Context.getCommentForDecl(Group[i], &PP); 7277 } 7278} 7279 7280/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 7281/// to introduce parameters into function prototype scope. 7282Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 7283 const DeclSpec &DS = D.getDeclSpec(); 7284 7285 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 7286 // C++03 [dcl.stc]p2 also permits 'auto'. 7287 VarDecl::StorageClass StorageClass = SC_None; 7288 VarDecl::StorageClass StorageClassAsWritten = SC_None; 7289 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 7290 StorageClass = SC_Register; 7291 StorageClassAsWritten = SC_Register; 7292 } else if (getLangOpts().CPlusPlus && 7293 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 7294 StorageClass = SC_Auto; 7295 StorageClassAsWritten = SC_Auto; 7296 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 7297 Diag(DS.getStorageClassSpecLoc(), 7298 diag::err_invalid_storage_class_in_func_decl); 7299 D.getMutableDeclSpec().ClearStorageClassSpecs(); 7300 } 7301 7302 if (D.getDeclSpec().isThreadSpecified()) 7303 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7304 if (D.getDeclSpec().isConstexprSpecified()) 7305 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 7306 << 0; 7307 7308 DiagnoseFunctionSpecifiers(D); 7309 7310 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7311 QualType parmDeclType = TInfo->getType(); 7312 7313 if (getLangOpts().CPlusPlus) { 7314 // Check that there are no default arguments inside the type of this 7315 // parameter. 7316 CheckExtraCXXDefaultArguments(D); 7317 7318 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 7319 if (D.getCXXScopeSpec().isSet()) { 7320 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 7321 << D.getCXXScopeSpec().getRange(); 7322 D.getCXXScopeSpec().clear(); 7323 } 7324 } 7325 7326 // Ensure we have a valid name 7327 IdentifierInfo *II = 0; 7328 if (D.hasName()) { 7329 II = D.getIdentifier(); 7330 if (!II) { 7331 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 7332 << GetNameForDeclarator(D).getName().getAsString(); 7333 D.setInvalidType(true); 7334 } 7335 } 7336 7337 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 7338 if (II) { 7339 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 7340 ForRedeclaration); 7341 LookupName(R, S); 7342 if (R.isSingleResult()) { 7343 NamedDecl *PrevDecl = R.getFoundDecl(); 7344 if (PrevDecl->isTemplateParameter()) { 7345 // Maybe we will complain about the shadowed template parameter. 7346 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7347 // Just pretend that we didn't see the previous declaration. 7348 PrevDecl = 0; 7349 } else if (S->isDeclScope(PrevDecl)) { 7350 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 7351 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7352 7353 // Recover by removing the name 7354 II = 0; 7355 D.SetIdentifier(0, D.getIdentifierLoc()); 7356 D.setInvalidType(true); 7357 } 7358 } 7359 } 7360 7361 // Temporarily put parameter variables in the translation unit, not 7362 // the enclosing context. This prevents them from accidentally 7363 // looking like class members in C++. 7364 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 7365 D.getLocStart(), 7366 D.getIdentifierLoc(), II, 7367 parmDeclType, TInfo, 7368 StorageClass, StorageClassAsWritten); 7369 7370 if (D.isInvalidType()) 7371 New->setInvalidDecl(); 7372 7373 assert(S->isFunctionPrototypeScope()); 7374 assert(S->getFunctionPrototypeDepth() >= 1); 7375 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 7376 S->getNextFunctionPrototypeIndex()); 7377 7378 // Add the parameter declaration into this scope. 7379 S->AddDecl(New); 7380 if (II) 7381 IdResolver.AddDecl(New); 7382 7383 ProcessDeclAttributes(S, New, D); 7384 7385 if (D.getDeclSpec().isModulePrivateSpecified()) 7386 Diag(New->getLocation(), diag::err_module_private_local) 7387 << 1 << New->getDeclName() 7388 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7389 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7390 7391 if (New->hasAttr<BlocksAttr>()) { 7392 Diag(New->getLocation(), diag::err_block_on_nonlocal); 7393 } 7394 return New; 7395} 7396 7397/// \brief Synthesizes a variable for a parameter arising from a 7398/// typedef. 7399ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 7400 SourceLocation Loc, 7401 QualType T) { 7402 /* FIXME: setting StartLoc == Loc. 7403 Would it be worth to modify callers so as to provide proper source 7404 location for the unnamed parameters, embedding the parameter's type? */ 7405 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 7406 T, Context.getTrivialTypeSourceInfo(T, Loc), 7407 SC_None, SC_None, 0); 7408 Param->setImplicit(); 7409 return Param; 7410} 7411 7412void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 7413 ParmVarDecl * const *ParamEnd) { 7414 // Don't diagnose unused-parameter errors in template instantiations; we 7415 // will already have done so in the template itself. 7416 if (!ActiveTemplateInstantiations.empty()) 7417 return; 7418 7419 for (; Param != ParamEnd; ++Param) { 7420 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 7421 !(*Param)->hasAttr<UnusedAttr>()) { 7422 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 7423 << (*Param)->getDeclName(); 7424 } 7425 } 7426} 7427 7428void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 7429 ParmVarDecl * const *ParamEnd, 7430 QualType ReturnTy, 7431 NamedDecl *D) { 7432 if (LangOpts.NumLargeByValueCopy == 0) // No check. 7433 return; 7434 7435 // Warn if the return value is pass-by-value and larger than the specified 7436 // threshold. 7437 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 7438 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 7439 if (Size > LangOpts.NumLargeByValueCopy) 7440 Diag(D->getLocation(), diag::warn_return_value_size) 7441 << D->getDeclName() << Size; 7442 } 7443 7444 // Warn if any parameter is pass-by-value and larger than the specified 7445 // threshold. 7446 for (; Param != ParamEnd; ++Param) { 7447 QualType T = (*Param)->getType(); 7448 if (T->isDependentType() || !T.isPODType(Context)) 7449 continue; 7450 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 7451 if (Size > LangOpts.NumLargeByValueCopy) 7452 Diag((*Param)->getLocation(), diag::warn_parameter_size) 7453 << (*Param)->getDeclName() << Size; 7454 } 7455} 7456 7457ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 7458 SourceLocation NameLoc, IdentifierInfo *Name, 7459 QualType T, TypeSourceInfo *TSInfo, 7460 VarDecl::StorageClass StorageClass, 7461 VarDecl::StorageClass StorageClassAsWritten) { 7462 // In ARC, infer a lifetime qualifier for appropriate parameter types. 7463 if (getLangOpts().ObjCAutoRefCount && 7464 T.getObjCLifetime() == Qualifiers::OCL_None && 7465 T->isObjCLifetimeType()) { 7466 7467 Qualifiers::ObjCLifetime lifetime; 7468 7469 // Special cases for arrays: 7470 // - if it's const, use __unsafe_unretained 7471 // - otherwise, it's an error 7472 if (T->isArrayType()) { 7473 if (!T.isConstQualified()) { 7474 DelayedDiagnostics.add( 7475 sema::DelayedDiagnostic::makeForbiddenType( 7476 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 7477 } 7478 lifetime = Qualifiers::OCL_ExplicitNone; 7479 } else { 7480 lifetime = T->getObjCARCImplicitLifetime(); 7481 } 7482 T = Context.getLifetimeQualifiedType(T, lifetime); 7483 } 7484 7485 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 7486 Context.getAdjustedParameterType(T), 7487 TSInfo, 7488 StorageClass, StorageClassAsWritten, 7489 0); 7490 7491 // Parameters can not be abstract class types. 7492 // For record types, this is done by the AbstractClassUsageDiagnoser once 7493 // the class has been completely parsed. 7494 if (!CurContext->isRecord() && 7495 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 7496 AbstractParamType)) 7497 New->setInvalidDecl(); 7498 7499 // Parameter declarators cannot be interface types. All ObjC objects are 7500 // passed by reference. 7501 if (T->isObjCObjectType()) { 7502 SourceLocation TypeEndLoc = TSInfo->getTypeLoc().getLocEnd(); 7503 Diag(NameLoc, 7504 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 7505 << FixItHint::CreateInsertion(TypeEndLoc, "*"); 7506 T = Context.getObjCObjectPointerType(T); 7507 New->setType(T); 7508 } 7509 7510 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 7511 // duration shall not be qualified by an address-space qualifier." 7512 // Since all parameters have automatic store duration, they can not have 7513 // an address space. 7514 if (T.getAddressSpace() != 0) { 7515 Diag(NameLoc, diag::err_arg_with_address_space); 7516 New->setInvalidDecl(); 7517 } 7518 7519 return New; 7520} 7521 7522void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 7523 SourceLocation LocAfterDecls) { 7524 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 7525 7526 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 7527 // for a K&R function. 7528 if (!FTI.hasPrototype) { 7529 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 7530 --i; 7531 if (FTI.ArgInfo[i].Param == 0) { 7532 SmallString<256> Code; 7533 llvm::raw_svector_ostream(Code) << " int " 7534 << FTI.ArgInfo[i].Ident->getName() 7535 << ";\n"; 7536 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 7537 << FTI.ArgInfo[i].Ident 7538 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 7539 7540 // Implicitly declare the argument as type 'int' for lack of a better 7541 // type. 7542 AttributeFactory attrs; 7543 DeclSpec DS(attrs); 7544 const char* PrevSpec; // unused 7545 unsigned DiagID; // unused 7546 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 7547 PrevSpec, DiagID); 7548 Declarator ParamD(DS, Declarator::KNRTypeListContext); 7549 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 7550 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 7551 } 7552 } 7553 } 7554} 7555 7556Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 7557 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 7558 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 7559 Scope *ParentScope = FnBodyScope->getParent(); 7560 7561 D.setFunctionDefinitionKind(FDK_Definition); 7562 Decl *DP = HandleDeclarator(ParentScope, D, MultiTemplateParamsArg()); 7563 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7564} 7565 7566static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7567 // Don't warn about invalid declarations. 7568 if (FD->isInvalidDecl()) 7569 return false; 7570 7571 // Or declarations that aren't global. 7572 if (!FD->isGlobal()) 7573 return false; 7574 7575 // Don't warn about C++ member functions. 7576 if (isa<CXXMethodDecl>(FD)) 7577 return false; 7578 7579 // Don't warn about 'main'. 7580 if (FD->isMain()) 7581 return false; 7582 7583 // Don't warn about inline functions. 7584 if (FD->isInlined()) 7585 return false; 7586 7587 // Don't warn about function templates. 7588 if (FD->getDescribedFunctionTemplate()) 7589 return false; 7590 7591 // Don't warn about function template specializations. 7592 if (FD->isFunctionTemplateSpecialization()) 7593 return false; 7594 7595 // Don't warn for OpenCL kernels. 7596 if (FD->hasAttr<OpenCLKernelAttr>()) 7597 return false; 7598 7599 bool MissingPrototype = true; 7600 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7601 Prev; Prev = Prev->getPreviousDecl()) { 7602 // Ignore any declarations that occur in function or method 7603 // scope, because they aren't visible from the header. 7604 if (Prev->getDeclContext()->isFunctionOrMethod()) 7605 continue; 7606 7607 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7608 break; 7609 } 7610 7611 return MissingPrototype; 7612} 7613 7614void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7615 // Don't complain if we're in GNU89 mode and the previous definition 7616 // was an extern inline function. 7617 const FunctionDecl *Definition; 7618 if (FD->isDefined(Definition) && 7619 !canRedefineFunction(Definition, getLangOpts())) { 7620 if (getLangOpts().GNUMode && Definition->isInlineSpecified() && 7621 Definition->getStorageClass() == SC_Extern) 7622 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7623 << FD->getDeclName() << getLangOpts().CPlusPlus; 7624 else 7625 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7626 Diag(Definition->getLocation(), diag::note_previous_definition); 7627 FD->setInvalidDecl(); 7628 } 7629} 7630 7631Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7632 // Clear the last template instantiation error context. 7633 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7634 7635 if (!D) 7636 return D; 7637 FunctionDecl *FD = 0; 7638 7639 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7640 FD = FunTmpl->getTemplatedDecl(); 7641 else 7642 FD = cast<FunctionDecl>(D); 7643 7644 // Enter a new function scope 7645 PushFunctionScope(); 7646 7647 // See if this is a redefinition. 7648 if (!FD->isLateTemplateParsed()) 7649 CheckForFunctionRedefinition(FD); 7650 7651 // Builtin functions cannot be defined. 7652 if (unsigned BuiltinID = FD->getBuiltinID()) { 7653 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7654 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7655 FD->setInvalidDecl(); 7656 } 7657 } 7658 7659 // The return type of a function definition must be complete 7660 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7661 QualType ResultType = FD->getResultType(); 7662 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7663 !FD->isInvalidDecl() && 7664 RequireCompleteType(FD->getLocation(), ResultType, 7665 diag::err_func_def_incomplete_result)) 7666 FD->setInvalidDecl(); 7667 7668 // GNU warning -Wmissing-prototypes: 7669 // Warn if a global function is defined without a previous 7670 // prototype declaration. This warning is issued even if the 7671 // definition itself provides a prototype. The aim is to detect 7672 // global functions that fail to be declared in header files. 7673 if (ShouldWarnAboutMissingPrototype(FD)) 7674 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7675 7676 if (FnBodyScope) 7677 PushDeclContext(FnBodyScope, FD); 7678 7679 // Check the validity of our function parameters 7680 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7681 /*CheckParameterNames=*/true); 7682 7683 // Introduce our parameters into the function scope 7684 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7685 ParmVarDecl *Param = FD->getParamDecl(p); 7686 Param->setOwningFunction(FD); 7687 7688 // If this has an identifier, add it to the scope stack. 7689 if (Param->getIdentifier() && FnBodyScope) { 7690 CheckShadow(FnBodyScope, Param); 7691 7692 PushOnScopeChains(Param, FnBodyScope); 7693 } 7694 } 7695 7696 // If we had any tags defined in the function prototype, 7697 // introduce them into the function scope. 7698 if (FnBodyScope) { 7699 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(), 7700 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) { 7701 NamedDecl *D = *I; 7702 7703 // Some of these decls (like enums) may have been pinned to the translation unit 7704 // for lack of a real context earlier. If so, remove from the translation unit 7705 // and reattach to the current context. 7706 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) { 7707 // Is the decl actually in the context? 7708 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(), 7709 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) { 7710 if (*DI == D) { 7711 Context.getTranslationUnitDecl()->removeDecl(D); 7712 break; 7713 } 7714 } 7715 // Either way, reassign the lexical decl context to our FunctionDecl. 7716 D->setLexicalDeclContext(CurContext); 7717 } 7718 7719 // If the decl has a non-null name, make accessible in the current scope. 7720 if (!D->getName().empty()) 7721 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false); 7722 7723 // Similarly, dive into enums and fish their constants out, making them 7724 // accessible in this scope. 7725 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) { 7726 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(), 7727 EE = ED->enumerator_end(); EI != EE; ++EI) 7728 PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false); 7729 } 7730 } 7731 } 7732 7733 // Ensure that the function's exception specification is instantiated. 7734 if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>()) 7735 ResolveExceptionSpec(D->getLocation(), FPT); 7736 7737 // Checking attributes of current function definition 7738 // dllimport attribute. 7739 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7740 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7741 // dllimport attribute cannot be directly applied to definition. 7742 // Microsoft accepts dllimport for functions defined within class scope. 7743 if (!DA->isInherited() && 7744 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7745 Diag(FD->getLocation(), 7746 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7747 << "dllimport"; 7748 FD->setInvalidDecl(); 7749 return FD; 7750 } 7751 7752 // Visual C++ appears to not think this is an issue, so only issue 7753 // a warning when Microsoft extensions are disabled. 7754 if (!LangOpts.MicrosoftExt) { 7755 // If a symbol previously declared dllimport is later defined, the 7756 // attribute is ignored in subsequent references, and a warning is 7757 // emitted. 7758 Diag(FD->getLocation(), 7759 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7760 << FD->getName() << "dllimport"; 7761 } 7762 } 7763 // We want to attach documentation to original Decl (which might be 7764 // a function template). 7765 ActOnDocumentableDecl(D); 7766 return FD; 7767} 7768 7769/// \brief Given the set of return statements within a function body, 7770/// compute the variables that are subject to the named return value 7771/// optimization. 7772/// 7773/// Each of the variables that is subject to the named return value 7774/// optimization will be marked as NRVO variables in the AST, and any 7775/// return statement that has a marked NRVO variable as its NRVO candidate can 7776/// use the named return value optimization. 7777/// 7778/// This function applies a very simplistic algorithm for NRVO: if every return 7779/// statement in the function has the same NRVO candidate, that candidate is 7780/// the NRVO variable. 7781/// 7782/// FIXME: Employ a smarter algorithm that accounts for multiple return 7783/// statements and the lifetimes of the NRVO candidates. We should be able to 7784/// find a maximal set of NRVO variables. 7785void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7786 ReturnStmt **Returns = Scope->Returns.data(); 7787 7788 const VarDecl *NRVOCandidate = 0; 7789 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7790 if (!Returns[I]->getNRVOCandidate()) 7791 return; 7792 7793 if (!NRVOCandidate) 7794 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7795 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7796 return; 7797 } 7798 7799 if (NRVOCandidate) 7800 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7801} 7802 7803Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7804 return ActOnFinishFunctionBody(D, BodyArg, false); 7805} 7806 7807Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7808 bool IsInstantiation) { 7809 FunctionDecl *FD = 0; 7810 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7811 if (FunTmpl) 7812 FD = FunTmpl->getTemplatedDecl(); 7813 else 7814 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7815 7816 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7817 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7818 7819 if (FD) { 7820 FD->setBody(Body); 7821 7822 // If the function implicitly returns zero (like 'main') or is naked, 7823 // don't complain about missing return statements. 7824 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) 7825 WP.disableCheckFallThrough(); 7826 7827 // MSVC permits the use of pure specifier (=0) on function definition, 7828 // defined at class scope, warn about this non standard construct. 7829 if (getLangOpts().MicrosoftExt && FD->isPure()) 7830 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7831 7832 if (!FD->isInvalidDecl()) { 7833 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7834 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7835 FD->getResultType(), FD); 7836 7837 // If this is a constructor, we need a vtable. 7838 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7839 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7840 7841 // Try to apply the named return value optimization. We have to check 7842 // if we can do this here because lambdas keep return statements around 7843 // to deduce an implicit return type. 7844 if (getLangOpts().CPlusPlus && FD->getResultType()->isRecordType() && 7845 !FD->isDependentContext()) 7846 computeNRVO(Body, getCurFunction()); 7847 } 7848 7849 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 7850 "Function parsing confused"); 7851 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7852 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7853 MD->setBody(Body); 7854 if (!MD->isInvalidDecl()) { 7855 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7856 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7857 MD->getResultType(), MD); 7858 7859 if (Body) 7860 computeNRVO(Body, getCurFunction()); 7861 } 7862 if (getCurFunction()->ObjCShouldCallSuperDealloc) { 7863 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_call) 7864 << MD->getSelector().getAsString(); 7865 getCurFunction()->ObjCShouldCallSuperDealloc = false; 7866 } 7867 if (getCurFunction()->ObjCShouldCallSuperFinalize) { 7868 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7869 getCurFunction()->ObjCShouldCallSuperFinalize = false; 7870 } 7871 } else { 7872 return 0; 7873 } 7874 7875 assert(!getCurFunction()->ObjCShouldCallSuperDealloc && 7876 "This should only be set for ObjC methods, which should have been " 7877 "handled in the block above."); 7878 assert(!getCurFunction()->ObjCShouldCallSuperFinalize && 7879 "This should only be set for ObjC methods, which should have been " 7880 "handled in the block above."); 7881 7882 // Verify and clean out per-function state. 7883 if (Body) { 7884 // C++ constructors that have function-try-blocks can't have return 7885 // statements in the handlers of that block. (C++ [except.handle]p14) 7886 // Verify this. 7887 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7888 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7889 7890 // Verify that gotos and switch cases don't jump into scopes illegally. 7891 if (getCurFunction()->NeedsScopeChecking() && 7892 !dcl->isInvalidDecl() && 7893 !hasAnyUnrecoverableErrorsInThisFunction() && 7894 !PP.isCodeCompletionEnabled()) 7895 DiagnoseInvalidJumps(Body); 7896 7897 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7898 if (!Destructor->getParent()->isDependentType()) 7899 CheckDestructor(Destructor); 7900 7901 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7902 Destructor->getParent()); 7903 } 7904 7905 // If any errors have occurred, clear out any temporaries that may have 7906 // been leftover. This ensures that these temporaries won't be picked up for 7907 // deletion in some later function. 7908 if (PP.getDiagnostics().hasErrorOccurred() || 7909 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7910 DiscardCleanupsInEvaluationContext(); 7911 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7912 // Since the body is valid, issue any analysis-based warnings that are 7913 // enabled. 7914 ActivePolicy = &WP; 7915 } 7916 7917 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7918 (!CheckConstexprFunctionDecl(FD) || 7919 !CheckConstexprFunctionBody(FD, Body))) 7920 FD->setInvalidDecl(); 7921 7922 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7923 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7924 assert(MaybeODRUseExprs.empty() && 7925 "Leftover expressions for odr-use checking"); 7926 } 7927 7928 if (!IsInstantiation) 7929 PopDeclContext(); 7930 7931 PopFunctionScopeInfo(ActivePolicy, dcl); 7932 7933 // If any errors have occurred, clear out any temporaries that may have 7934 // been leftover. This ensures that these temporaries won't be picked up for 7935 // deletion in some later function. 7936 if (getDiagnostics().hasErrorOccurred()) { 7937 DiscardCleanupsInEvaluationContext(); 7938 } 7939 7940 return dcl; 7941} 7942 7943 7944/// When we finish delayed parsing of an attribute, we must attach it to the 7945/// relevant Decl. 7946void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7947 ParsedAttributes &Attrs) { 7948 // Always attach attributes to the underlying decl. 7949 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7950 D = TD->getTemplatedDecl(); 7951 ProcessDeclAttributeList(S, D, Attrs.getList()); 7952 7953 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D)) 7954 if (Method->isStatic()) 7955 checkThisInStaticMemberFunctionAttributes(Method); 7956} 7957 7958 7959/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7960/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7961NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7962 IdentifierInfo &II, Scope *S) { 7963 // Before we produce a declaration for an implicitly defined 7964 // function, see whether there was a locally-scoped declaration of 7965 // this name as a function or variable. If so, use that 7966 // (non-visible) declaration, and complain about it. 7967 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7968 = findLocallyScopedExternalDecl(&II); 7969 if (Pos != LocallyScopedExternalDecls.end()) { 7970 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7971 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7972 return Pos->second; 7973 } 7974 7975 // Extension in C99. Legal in C90, but warn about it. 7976 unsigned diag_id; 7977 if (II.getName().startswith("__builtin_")) 7978 diag_id = diag::warn_builtin_unknown; 7979 else if (getLangOpts().C99) 7980 diag_id = diag::ext_implicit_function_decl; 7981 else 7982 diag_id = diag::warn_implicit_function_decl; 7983 Diag(Loc, diag_id) << &II; 7984 7985 // Because typo correction is expensive, only do it if the implicit 7986 // function declaration is going to be treated as an error. 7987 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7988 TypoCorrection Corrected; 7989 DeclFilterCCC<FunctionDecl> Validator; 7990 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7991 LookupOrdinaryName, S, 0, Validator))) { 7992 std::string CorrectedStr = Corrected.getAsString(getLangOpts()); 7993 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts()); 7994 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7995 7996 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7997 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7998 7999 if (Func->getLocation().isValid() 8000 && !II.getName().startswith("__builtin_")) 8001 Diag(Func->getLocation(), diag::note_previous_decl) 8002 << CorrectedQuotedStr; 8003 } 8004 } 8005 8006 // Set a Declarator for the implicit definition: int foo(); 8007 const char *Dummy; 8008 AttributeFactory attrFactory; 8009 DeclSpec DS(attrFactory); 8010 unsigned DiagID; 8011 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 8012 (void)Error; // Silence warning. 8013 assert(!Error && "Error setting up implicit decl!"); 8014 Declarator D(DS, Declarator::BlockContext); 8015 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, false, 8016 SourceLocation(), 0, 0, 0, true, 8017 SourceLocation(), SourceLocation(), 8018 SourceLocation(), SourceLocation(), 8019 EST_None, SourceLocation(), 8020 0, 0, 0, 0, Loc, Loc, D), 8021 DS.getAttributes(), 8022 SourceLocation()); 8023 D.SetIdentifier(&II, Loc); 8024 8025 // Insert this function into translation-unit scope. 8026 8027 DeclContext *PrevDC = CurContext; 8028 CurContext = Context.getTranslationUnitDecl(); 8029 8030 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 8031 FD->setImplicit(); 8032 8033 CurContext = PrevDC; 8034 8035 AddKnownFunctionAttributes(FD); 8036 8037 return FD; 8038} 8039 8040/// \brief Adds any function attributes that we know a priori based on 8041/// the declaration of this function. 8042/// 8043/// These attributes can apply both to implicitly-declared builtins 8044/// (like __builtin___printf_chk) or to library-declared functions 8045/// like NSLog or printf. 8046/// 8047/// We need to check for duplicate attributes both here and where user-written 8048/// attributes are applied to declarations. 8049void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 8050 if (FD->isInvalidDecl()) 8051 return; 8052 8053 // If this is a built-in function, map its builtin attributes to 8054 // actual attributes. 8055 if (unsigned BuiltinID = FD->getBuiltinID()) { 8056 // Handle printf-formatting attributes. 8057 unsigned FormatIdx; 8058 bool HasVAListArg; 8059 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 8060 if (!FD->getAttr<FormatAttr>()) { 8061 const char *fmt = "printf"; 8062 unsigned int NumParams = FD->getNumParams(); 8063 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 8064 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 8065 fmt = "NSString"; 8066 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 8067 fmt, FormatIdx+1, 8068 HasVAListArg ? 0 : FormatIdx+2)); 8069 } 8070 } 8071 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 8072 HasVAListArg)) { 8073 if (!FD->getAttr<FormatAttr>()) 8074 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 8075 "scanf", FormatIdx+1, 8076 HasVAListArg ? 0 : FormatIdx+2)); 8077 } 8078 8079 // Mark const if we don't care about errno and that is the only 8080 // thing preventing the function from being const. This allows 8081 // IRgen to use LLVM intrinsics for such functions. 8082 if (!getLangOpts().MathErrno && 8083 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 8084 if (!FD->getAttr<ConstAttr>()) 8085 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 8086 } 8087 8088 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 8089 !FD->getAttr<ReturnsTwiceAttr>()) 8090 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 8091 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 8092 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 8093 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 8094 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 8095 } 8096 8097 IdentifierInfo *Name = FD->getIdentifier(); 8098 if (!Name) 8099 return; 8100 if ((!getLangOpts().CPlusPlus && 8101 FD->getDeclContext()->isTranslationUnit()) || 8102 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 8103 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 8104 LinkageSpecDecl::lang_c)) { 8105 // Okay: this could be a libc/libm/Objective-C function we know 8106 // about. 8107 } else 8108 return; 8109 8110 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 8111 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 8112 // target-specific builtins, perhaps? 8113 if (!FD->getAttr<FormatAttr>()) 8114 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 8115 "printf", 2, 8116 Name->isStr("vasprintf") ? 0 : 3)); 8117 } 8118 8119 if (Name->isStr("__CFStringMakeConstantString")) { 8120 // We already have a __builtin___CFStringMakeConstantString, 8121 // but builds that use -fno-constant-cfstrings don't go through that. 8122 if (!FD->getAttr<FormatArgAttr>()) 8123 FD->addAttr(::new (Context) FormatArgAttr(FD->getLocation(), Context, 1)); 8124 } 8125} 8126 8127TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 8128 TypeSourceInfo *TInfo) { 8129 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 8130 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 8131 8132 if (!TInfo) { 8133 assert(D.isInvalidType() && "no declarator info for valid type"); 8134 TInfo = Context.getTrivialTypeSourceInfo(T); 8135 } 8136 8137 // Scope manipulation handled by caller. 8138 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 8139 D.getLocStart(), 8140 D.getIdentifierLoc(), 8141 D.getIdentifier(), 8142 TInfo); 8143 8144 // Bail out immediately if we have an invalid declaration. 8145 if (D.isInvalidType()) { 8146 NewTD->setInvalidDecl(); 8147 return NewTD; 8148 } 8149 8150 if (D.getDeclSpec().isModulePrivateSpecified()) { 8151 if (CurContext->isFunctionOrMethod()) 8152 Diag(NewTD->getLocation(), diag::err_module_private_local) 8153 << 2 << NewTD->getDeclName() 8154 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 8155 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 8156 else 8157 NewTD->setModulePrivate(); 8158 } 8159 8160 // C++ [dcl.typedef]p8: 8161 // If the typedef declaration defines an unnamed class (or 8162 // enum), the first typedef-name declared by the declaration 8163 // to be that class type (or enum type) is used to denote the 8164 // class type (or enum type) for linkage purposes only. 8165 // We need to check whether the type was declared in the declaration. 8166 switch (D.getDeclSpec().getTypeSpecType()) { 8167 case TST_enum: 8168 case TST_struct: 8169 case TST_interface: 8170 case TST_union: 8171 case TST_class: { 8172 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 8173 8174 // Do nothing if the tag is not anonymous or already has an 8175 // associated typedef (from an earlier typedef in this decl group). 8176 if (tagFromDeclSpec->getIdentifier()) break; 8177 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 8178 8179 // A well-formed anonymous tag must always be a TUK_Definition. 8180 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 8181 8182 // The type must match the tag exactly; no qualifiers allowed. 8183 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 8184 break; 8185 8186 // Otherwise, set this is the anon-decl typedef for the tag. 8187 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 8188 break; 8189 } 8190 8191 default: 8192 break; 8193 } 8194 8195 return NewTD; 8196} 8197 8198 8199/// \brief Check that this is a valid underlying type for an enum declaration. 8200bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) { 8201 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 8202 QualType T = TI->getType(); 8203 8204 if (T->isDependentType() || T->isIntegralType(Context)) 8205 return false; 8206 8207 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T; 8208 return true; 8209} 8210 8211/// Check whether this is a valid redeclaration of a previous enumeration. 8212/// \return true if the redeclaration was invalid. 8213bool Sema::CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped, 8214 QualType EnumUnderlyingTy, 8215 const EnumDecl *Prev) { 8216 bool IsFixed = !EnumUnderlyingTy.isNull(); 8217 8218 if (IsScoped != Prev->isScoped()) { 8219 Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch) 8220 << Prev->isScoped(); 8221 Diag(Prev->getLocation(), diag::note_previous_use); 8222 return true; 8223 } 8224 8225 if (IsFixed && Prev->isFixed()) { 8226 if (!EnumUnderlyingTy->isDependentType() && 8227 !Prev->getIntegerType()->isDependentType() && 8228 !Context.hasSameUnqualifiedType(EnumUnderlyingTy, 8229 Prev->getIntegerType())) { 8230 Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch) 8231 << EnumUnderlyingTy << Prev->getIntegerType(); 8232 Diag(Prev->getLocation(), diag::note_previous_use); 8233 return true; 8234 } 8235 } else if (IsFixed != Prev->isFixed()) { 8236 Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch) 8237 << Prev->isFixed(); 8238 Diag(Prev->getLocation(), diag::note_previous_use); 8239 return true; 8240 } 8241 8242 return false; 8243} 8244 8245/// \brief Get diagnostic %select index for tag kind for 8246/// redeclaration diagnostic message. 8247/// WARNING: Indexes apply to particular diagnostics only! 8248/// 8249/// \returns diagnostic %select index. 8250static unsigned getRedeclDiagFromTagKind(TagTypeKind Tag) { 8251 switch (Tag) { 8252 case TTK_Struct: return 0; 8253 case TTK_Interface: return 1; 8254 case TTK_Class: return 2; 8255 default: llvm_unreachable("Invalid tag kind for redecl diagnostic!"); 8256 } 8257} 8258 8259/// \brief Determine if tag kind is a class-key compatible with 8260/// class for redeclaration (class, struct, or __interface). 8261/// 8262/// \returns true iff the tag kind is compatible. 8263static bool isClassCompatTagKind(TagTypeKind Tag) 8264{ 8265 return Tag == TTK_Struct || Tag == TTK_Class || Tag == TTK_Interface; 8266} 8267 8268/// \brief Determine whether a tag with a given kind is acceptable 8269/// as a redeclaration of the given tag declaration. 8270/// 8271/// \returns true if the new tag kind is acceptable, false otherwise. 8272bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 8273 TagTypeKind NewTag, bool isDefinition, 8274 SourceLocation NewTagLoc, 8275 const IdentifierInfo &Name) { 8276 // C++ [dcl.type.elab]p3: 8277 // The class-key or enum keyword present in the 8278 // elaborated-type-specifier shall agree in kind with the 8279 // declaration to which the name in the elaborated-type-specifier 8280 // refers. This rule also applies to the form of 8281 // elaborated-type-specifier that declares a class-name or 8282 // friend class since it can be construed as referring to the 8283 // definition of the class. Thus, in any 8284 // elaborated-type-specifier, the enum keyword shall be used to 8285 // refer to an enumeration (7.2), the union class-key shall be 8286 // used to refer to a union (clause 9), and either the class or 8287 // struct class-key shall be used to refer to a class (clause 9) 8288 // declared using the class or struct class-key. 8289 TagTypeKind OldTag = Previous->getTagKind(); 8290 if (!isDefinition || !isClassCompatTagKind(NewTag)) 8291 if (OldTag == NewTag) 8292 return true; 8293 8294 if (isClassCompatTagKind(OldTag) && isClassCompatTagKind(NewTag)) { 8295 // Warn about the struct/class tag mismatch. 8296 bool isTemplate = false; 8297 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 8298 isTemplate = Record->getDescribedClassTemplate(); 8299 8300 if (!ActiveTemplateInstantiations.empty()) { 8301 // In a template instantiation, do not offer fix-its for tag mismatches 8302 // since they usually mess up the template instead of fixing the problem. 8303 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 8304 << getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name 8305 << getRedeclDiagFromTagKind(OldTag); 8306 return true; 8307 } 8308 8309 if (isDefinition) { 8310 // On definitions, check previous tags and issue a fix-it for each 8311 // one that doesn't match the current tag. 8312 if (Previous->getDefinition()) { 8313 // Don't suggest fix-its for redefinitions. 8314 return true; 8315 } 8316 8317 bool previousMismatch = false; 8318 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 8319 E(Previous->redecls_end()); I != E; ++I) { 8320 if (I->getTagKind() != NewTag) { 8321 if (!previousMismatch) { 8322 previousMismatch = true; 8323 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 8324 << getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name 8325 << getRedeclDiagFromTagKind(I->getTagKind()); 8326 } 8327 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 8328 << getRedeclDiagFromTagKind(NewTag) 8329 << FixItHint::CreateReplacement(I->getInnerLocStart(), 8330 TypeWithKeyword::getTagTypeKindName(NewTag)); 8331 } 8332 } 8333 return true; 8334 } 8335 8336 // Check for a previous definition. If current tag and definition 8337 // are same type, do nothing. If no definition, but disagree with 8338 // with previous tag type, give a warning, but no fix-it. 8339 const TagDecl *Redecl = Previous->getDefinition() ? 8340 Previous->getDefinition() : Previous; 8341 if (Redecl->getTagKind() == NewTag) { 8342 return true; 8343 } 8344 8345 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 8346 << getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name 8347 << getRedeclDiagFromTagKind(OldTag); 8348 Diag(Redecl->getLocation(), diag::note_previous_use); 8349 8350 // If there is a previous defintion, suggest a fix-it. 8351 if (Previous->getDefinition()) { 8352 Diag(NewTagLoc, diag::note_struct_class_suggestion) 8353 << getRedeclDiagFromTagKind(Redecl->getTagKind()) 8354 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 8355 TypeWithKeyword::getTagTypeKindName(Redecl->getTagKind())); 8356 } 8357 8358 return true; 8359 } 8360 return false; 8361} 8362 8363/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 8364/// former case, Name will be non-null. In the later case, Name will be null. 8365/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 8366/// reference/declaration/definition of a tag. 8367Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 8368 SourceLocation KWLoc, CXXScopeSpec &SS, 8369 IdentifierInfo *Name, SourceLocation NameLoc, 8370 AttributeList *Attr, AccessSpecifier AS, 8371 SourceLocation ModulePrivateLoc, 8372 MultiTemplateParamsArg TemplateParameterLists, 8373 bool &OwnedDecl, bool &IsDependent, 8374 SourceLocation ScopedEnumKWLoc, 8375 bool ScopedEnumUsesClassTag, 8376 TypeResult UnderlyingType) { 8377 // If this is not a definition, it must have a name. 8378 IdentifierInfo *OrigName = Name; 8379 assert((Name != 0 || TUK == TUK_Definition) && 8380 "Nameless record must be a definition!"); 8381 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 8382 8383 OwnedDecl = false; 8384 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8385 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 8386 8387 // FIXME: Check explicit specializations more carefully. 8388 bool isExplicitSpecialization = false; 8389 bool Invalid = false; 8390 8391 // We only need to do this matching if we have template parameters 8392 // or a scope specifier, which also conveniently avoids this work 8393 // for non-C++ cases. 8394 if (TemplateParameterLists.size() > 0 || 8395 (SS.isNotEmpty() && TUK != TUK_Reference)) { 8396 if (TemplateParameterList *TemplateParams 8397 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 8398 TemplateParameterLists.data(), 8399 TemplateParameterLists.size(), 8400 TUK == TUK_Friend, 8401 isExplicitSpecialization, 8402 Invalid)) { 8403 if (TemplateParams->size() > 0) { 8404 // This is a declaration or definition of a class template (which may 8405 // be a member of another template). 8406 8407 if (Invalid) 8408 return 0; 8409 8410 OwnedDecl = false; 8411 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 8412 SS, Name, NameLoc, Attr, 8413 TemplateParams, AS, 8414 ModulePrivateLoc, 8415 TemplateParameterLists.size()-1, 8416 TemplateParameterLists.data()); 8417 return Result.get(); 8418 } else { 8419 // The "template<>" header is extraneous. 8420 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8421 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8422 isExplicitSpecialization = true; 8423 } 8424 } 8425 } 8426 8427 // Figure out the underlying type if this a enum declaration. We need to do 8428 // this early, because it's needed to detect if this is an incompatible 8429 // redeclaration. 8430 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 8431 8432 if (Kind == TTK_Enum) { 8433 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 8434 // No underlying type explicitly specified, or we failed to parse the 8435 // type, default to int. 8436 EnumUnderlying = Context.IntTy.getTypePtr(); 8437 else if (UnderlyingType.get()) { 8438 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 8439 // integral type; any cv-qualification is ignored. 8440 TypeSourceInfo *TI = 0; 8441 GetTypeFromParser(UnderlyingType.get(), &TI); 8442 EnumUnderlying = TI; 8443 8444 if (CheckEnumUnderlyingType(TI)) 8445 // Recover by falling back to int. 8446 EnumUnderlying = Context.IntTy.getTypePtr(); 8447 8448 if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI, 8449 UPPC_FixedUnderlyingType)) 8450 EnumUnderlying = Context.IntTy.getTypePtr(); 8451 8452 } else if (getLangOpts().MicrosoftMode) 8453 // Microsoft enums are always of int type. 8454 EnumUnderlying = Context.IntTy.getTypePtr(); 8455 } 8456 8457 DeclContext *SearchDC = CurContext; 8458 DeclContext *DC = CurContext; 8459 bool isStdBadAlloc = false; 8460 8461 RedeclarationKind Redecl = ForRedeclaration; 8462 if (TUK == TUK_Friend || TUK == TUK_Reference) 8463 Redecl = NotForRedeclaration; 8464 8465 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 8466 8467 if (Name && SS.isNotEmpty()) { 8468 // We have a nested-name tag ('struct foo::bar'). 8469 8470 // Check for invalid 'foo::'. 8471 if (SS.isInvalid()) { 8472 Name = 0; 8473 goto CreateNewDecl; 8474 } 8475 8476 // If this is a friend or a reference to a class in a dependent 8477 // context, don't try to make a decl for it. 8478 if (TUK == TUK_Friend || TUK == TUK_Reference) { 8479 DC = computeDeclContext(SS, false); 8480 if (!DC) { 8481 IsDependent = true; 8482 return 0; 8483 } 8484 } else { 8485 DC = computeDeclContext(SS, true); 8486 if (!DC) { 8487 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 8488 << SS.getRange(); 8489 return 0; 8490 } 8491 } 8492 8493 if (RequireCompleteDeclContext(SS, DC)) 8494 return 0; 8495 8496 SearchDC = DC; 8497 // Look-up name inside 'foo::'. 8498 LookupQualifiedName(Previous, DC); 8499 8500 if (Previous.isAmbiguous()) 8501 return 0; 8502 8503 if (Previous.empty()) { 8504 // Name lookup did not find anything. However, if the 8505 // nested-name-specifier refers to the current instantiation, 8506 // and that current instantiation has any dependent base 8507 // classes, we might find something at instantiation time: treat 8508 // this as a dependent elaborated-type-specifier. 8509 // But this only makes any sense for reference-like lookups. 8510 if (Previous.wasNotFoundInCurrentInstantiation() && 8511 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8512 IsDependent = true; 8513 return 0; 8514 } 8515 8516 // A tag 'foo::bar' must already exist. 8517 Diag(NameLoc, diag::err_not_tag_in_scope) 8518 << Kind << Name << DC << SS.getRange(); 8519 Name = 0; 8520 Invalid = true; 8521 goto CreateNewDecl; 8522 } 8523 } else if (Name) { 8524 // If this is a named struct, check to see if there was a previous forward 8525 // declaration or definition. 8526 // FIXME: We're looking into outer scopes here, even when we 8527 // shouldn't be. Doing so can result in ambiguities that we 8528 // shouldn't be diagnosing. 8529 LookupName(Previous, S); 8530 8531 if (Previous.isAmbiguous() && 8532 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 8533 LookupResult::Filter F = Previous.makeFilter(); 8534 while (F.hasNext()) { 8535 NamedDecl *ND = F.next(); 8536 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 8537 F.erase(); 8538 } 8539 F.done(); 8540 } 8541 8542 // Note: there used to be some attempt at recovery here. 8543 if (Previous.isAmbiguous()) 8544 return 0; 8545 8546 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) { 8547 // FIXME: This makes sure that we ignore the contexts associated 8548 // with C structs, unions, and enums when looking for a matching 8549 // tag declaration or definition. See the similar lookup tweak 8550 // in Sema::LookupName; is there a better way to deal with this? 8551 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 8552 SearchDC = SearchDC->getParent(); 8553 } 8554 } else if (S->isFunctionPrototypeScope()) { 8555 // If this is an enum declaration in function prototype scope, set its 8556 // initial context to the translation unit. 8557 // FIXME: [citation needed] 8558 SearchDC = Context.getTranslationUnitDecl(); 8559 } 8560 8561 if (Previous.isSingleResult() && 8562 Previous.getFoundDecl()->isTemplateParameter()) { 8563 // Maybe we will complain about the shadowed template parameter. 8564 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 8565 // Just pretend that we didn't see the previous declaration. 8566 Previous.clear(); 8567 } 8568 8569 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace && 8570 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 8571 // This is a declaration of or a reference to "std::bad_alloc". 8572 isStdBadAlloc = true; 8573 8574 if (Previous.empty() && StdBadAlloc) { 8575 // std::bad_alloc has been implicitly declared (but made invisible to 8576 // name lookup). Fill in this implicit declaration as the previous 8577 // declaration, so that the declarations get chained appropriately. 8578 Previous.addDecl(getStdBadAlloc()); 8579 } 8580 } 8581 8582 // If we didn't find a previous declaration, and this is a reference 8583 // (or friend reference), move to the correct scope. In C++, we 8584 // also need to do a redeclaration lookup there, just in case 8585 // there's a shadow friend decl. 8586 if (Name && Previous.empty() && 8587 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8588 if (Invalid) goto CreateNewDecl; 8589 assert(SS.isEmpty()); 8590 8591 if (TUK == TUK_Reference) { 8592 // C++ [basic.scope.pdecl]p5: 8593 // -- for an elaborated-type-specifier of the form 8594 // 8595 // class-key identifier 8596 // 8597 // if the elaborated-type-specifier is used in the 8598 // decl-specifier-seq or parameter-declaration-clause of a 8599 // function defined in namespace scope, the identifier is 8600 // declared as a class-name in the namespace that contains 8601 // the declaration; otherwise, except as a friend 8602 // declaration, the identifier is declared in the smallest 8603 // non-class, non-function-prototype scope that contains the 8604 // declaration. 8605 // 8606 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 8607 // C structs and unions. 8608 // 8609 // It is an error in C++ to declare (rather than define) an enum 8610 // type, including via an elaborated type specifier. We'll 8611 // diagnose that later; for now, declare the enum in the same 8612 // scope as we would have picked for any other tag type. 8613 // 8614 // GNU C also supports this behavior as part of its incomplete 8615 // enum types extension, while GNU C++ does not. 8616 // 8617 // Find the context where we'll be declaring the tag. 8618 // FIXME: We would like to maintain the current DeclContext as the 8619 // lexical context, 8620 while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod()) 8621 SearchDC = SearchDC->getParent(); 8622 8623 // Find the scope where we'll be declaring the tag. 8624 while (S->isClassScope() || 8625 (getLangOpts().CPlusPlus && 8626 S->isFunctionPrototypeScope()) || 8627 ((S->getFlags() & Scope::DeclScope) == 0) || 8628 (S->getEntity() && 8629 ((DeclContext *)S->getEntity())->isTransparentContext())) 8630 S = S->getParent(); 8631 } else { 8632 assert(TUK == TUK_Friend); 8633 // C++ [namespace.memdef]p3: 8634 // If a friend declaration in a non-local class first declares a 8635 // class or function, the friend class or function is a member of 8636 // the innermost enclosing namespace. 8637 SearchDC = SearchDC->getEnclosingNamespaceContext(); 8638 } 8639 8640 // In C++, we need to do a redeclaration lookup to properly 8641 // diagnose some problems. 8642 if (getLangOpts().CPlusPlus) { 8643 Previous.setRedeclarationKind(ForRedeclaration); 8644 LookupQualifiedName(Previous, SearchDC); 8645 } 8646 } 8647 8648 if (!Previous.empty()) { 8649 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 8650 8651 // It's okay to have a tag decl in the same scope as a typedef 8652 // which hides a tag decl in the same scope. Finding this 8653 // insanity with a redeclaration lookup can only actually happen 8654 // in C++. 8655 // 8656 // This is also okay for elaborated-type-specifiers, which is 8657 // technically forbidden by the current standard but which is 8658 // okay according to the likely resolution of an open issue; 8659 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 8660 if (getLangOpts().CPlusPlus) { 8661 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8662 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 8663 TagDecl *Tag = TT->getDecl(); 8664 if (Tag->getDeclName() == Name && 8665 Tag->getDeclContext()->getRedeclContext() 8666 ->Equals(TD->getDeclContext()->getRedeclContext())) { 8667 PrevDecl = Tag; 8668 Previous.clear(); 8669 Previous.addDecl(Tag); 8670 Previous.resolveKind(); 8671 } 8672 } 8673 } 8674 } 8675 8676 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 8677 // If this is a use of a previous tag, or if the tag is already declared 8678 // in the same scope (so that the definition/declaration completes or 8679 // rementions the tag), reuse the decl. 8680 if (TUK == TUK_Reference || TUK == TUK_Friend || 8681 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 8682 // Make sure that this wasn't declared as an enum and now used as a 8683 // struct or something similar. 8684 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 8685 TUK == TUK_Definition, KWLoc, 8686 *Name)) { 8687 bool SafeToContinue 8688 = (PrevTagDecl->getTagKind() != TTK_Enum && 8689 Kind != TTK_Enum); 8690 if (SafeToContinue) 8691 Diag(KWLoc, diag::err_use_with_wrong_tag) 8692 << Name 8693 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8694 PrevTagDecl->getKindName()); 8695 else 8696 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8697 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8698 8699 if (SafeToContinue) 8700 Kind = PrevTagDecl->getTagKind(); 8701 else { 8702 // Recover by making this an anonymous redefinition. 8703 Name = 0; 8704 Previous.clear(); 8705 Invalid = true; 8706 } 8707 } 8708 8709 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8710 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8711 8712 // If this is an elaborated-type-specifier for a scoped enumeration, 8713 // the 'class' keyword is not necessary and not permitted. 8714 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8715 if (ScopedEnum) 8716 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8717 << PrevEnum->isScoped() 8718 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8719 return PrevTagDecl; 8720 } 8721 8722 QualType EnumUnderlyingTy; 8723 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8724 EnumUnderlyingTy = TI->getType(); 8725 else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>()) 8726 EnumUnderlyingTy = QualType(T, 0); 8727 8728 // All conflicts with previous declarations are recovered by 8729 // returning the previous declaration, unless this is a definition, 8730 // in which case we want the caller to bail out. 8731 if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc, 8732 ScopedEnum, EnumUnderlyingTy, PrevEnum)) 8733 return TUK == TUK_Declaration ? PrevTagDecl : 0; 8734 } 8735 8736 if (!Invalid) { 8737 // If this is a use, just return the declaration we found. 8738 8739 // FIXME: In the future, return a variant or some other clue 8740 // for the consumer of this Decl to know it doesn't own it. 8741 // For our current ASTs this shouldn't be a problem, but will 8742 // need to be changed with DeclGroups. 8743 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8744 getLangOpts().MicrosoftExt)) || TUK == TUK_Friend) 8745 return PrevTagDecl; 8746 8747 // Diagnose attempts to redefine a tag. 8748 if (TUK == TUK_Definition) { 8749 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8750 // If we're defining a specialization and the previous definition 8751 // is from an implicit instantiation, don't emit an error 8752 // here; we'll catch this in the general case below. 8753 bool IsExplicitSpecializationAfterInstantiation = false; 8754 if (isExplicitSpecialization) { 8755 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def)) 8756 IsExplicitSpecializationAfterInstantiation = 8757 RD->getTemplateSpecializationKind() != 8758 TSK_ExplicitSpecialization; 8759 else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def)) 8760 IsExplicitSpecializationAfterInstantiation = 8761 ED->getTemplateSpecializationKind() != 8762 TSK_ExplicitSpecialization; 8763 } 8764 8765 if (!IsExplicitSpecializationAfterInstantiation) { 8766 // A redeclaration in function prototype scope in C isn't 8767 // visible elsewhere, so merely issue a warning. 8768 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope()) 8769 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name; 8770 else 8771 Diag(NameLoc, diag::err_redefinition) << Name; 8772 Diag(Def->getLocation(), diag::note_previous_definition); 8773 // If this is a redefinition, recover by making this 8774 // struct be anonymous, which will make any later 8775 // references get the previous definition. 8776 Name = 0; 8777 Previous.clear(); 8778 Invalid = true; 8779 } 8780 } else { 8781 // If the type is currently being defined, complain 8782 // about a nested redefinition. 8783 const TagType *Tag 8784 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8785 if (Tag->isBeingDefined()) { 8786 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8787 Diag(PrevTagDecl->getLocation(), 8788 diag::note_previous_definition); 8789 Name = 0; 8790 Previous.clear(); 8791 Invalid = true; 8792 } 8793 } 8794 8795 // Okay, this is definition of a previously declared or referenced 8796 // tag PrevDecl. We're going to create a new Decl for it. 8797 } 8798 } 8799 // If we get here we have (another) forward declaration or we 8800 // have a definition. Just create a new decl. 8801 8802 } else { 8803 // If we get here, this is a definition of a new tag type in a nested 8804 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8805 // new decl/type. We set PrevDecl to NULL so that the entities 8806 // have distinct types. 8807 Previous.clear(); 8808 } 8809 // If we get here, we're going to create a new Decl. If PrevDecl 8810 // is non-NULL, it's a definition of the tag declared by 8811 // PrevDecl. If it's NULL, we have a new definition. 8812 8813 8814 // Otherwise, PrevDecl is not a tag, but was found with tag 8815 // lookup. This is only actually possible in C++, where a few 8816 // things like templates still live in the tag namespace. 8817 } else { 8818 // Use a better diagnostic if an elaborated-type-specifier 8819 // found the wrong kind of type on the first 8820 // (non-redeclaration) lookup. 8821 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8822 !Previous.isForRedeclaration()) { 8823 unsigned Kind = 0; 8824 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8825 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8826 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8827 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8828 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8829 Invalid = true; 8830 8831 // Otherwise, only diagnose if the declaration is in scope. 8832 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8833 isExplicitSpecialization)) { 8834 // do nothing 8835 8836 // Diagnose implicit declarations introduced by elaborated types. 8837 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8838 unsigned Kind = 0; 8839 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8840 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8841 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8842 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8843 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8844 Invalid = true; 8845 8846 // Otherwise it's a declaration. Call out a particularly common 8847 // case here. 8848 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8849 unsigned Kind = 0; 8850 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8851 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8852 << Name << Kind << TND->getUnderlyingType(); 8853 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8854 Invalid = true; 8855 8856 // Otherwise, diagnose. 8857 } else { 8858 // The tag name clashes with something else in the target scope, 8859 // issue an error and recover by making this tag be anonymous. 8860 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8861 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8862 Name = 0; 8863 Invalid = true; 8864 } 8865 8866 // The existing declaration isn't relevant to us; we're in a 8867 // new scope, so clear out the previous declaration. 8868 Previous.clear(); 8869 } 8870 } 8871 8872CreateNewDecl: 8873 8874 TagDecl *PrevDecl = 0; 8875 if (Previous.isSingleResult()) 8876 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8877 8878 // If there is an identifier, use the location of the identifier as the 8879 // location of the decl, otherwise use the location of the struct/union 8880 // keyword. 8881 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8882 8883 // Otherwise, create a new declaration. If there is a previous 8884 // declaration of the same entity, the two will be linked via 8885 // PrevDecl. 8886 TagDecl *New; 8887 8888 bool IsForwardReference = false; 8889 if (Kind == TTK_Enum) { 8890 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8891 // enum X { A, B, C } D; D should chain to X. 8892 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8893 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8894 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8895 // If this is an undefined enum, warn. 8896 if (TUK != TUK_Definition && !Invalid) { 8897 TagDecl *Def; 8898 if (getLangOpts().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8899 // C++0x: 7.2p2: opaque-enum-declaration. 8900 // Conflicts are diagnosed above. Do nothing. 8901 } 8902 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8903 Diag(Loc, diag::ext_forward_ref_enum_def) 8904 << New; 8905 Diag(Def->getLocation(), diag::note_previous_definition); 8906 } else { 8907 unsigned DiagID = diag::ext_forward_ref_enum; 8908 if (getLangOpts().MicrosoftMode) 8909 DiagID = diag::ext_ms_forward_ref_enum; 8910 else if (getLangOpts().CPlusPlus) 8911 DiagID = diag::err_forward_ref_enum; 8912 Diag(Loc, DiagID); 8913 8914 // If this is a forward-declared reference to an enumeration, make a 8915 // note of it; we won't actually be introducing the declaration into 8916 // the declaration context. 8917 if (TUK == TUK_Reference) 8918 IsForwardReference = true; 8919 } 8920 } 8921 8922 if (EnumUnderlying) { 8923 EnumDecl *ED = cast<EnumDecl>(New); 8924 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8925 ED->setIntegerTypeSourceInfo(TI); 8926 else 8927 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8928 ED->setPromotionType(ED->getIntegerType()); 8929 } 8930 8931 } else { 8932 // struct/union/class 8933 8934 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8935 // struct X { int A; } D; D should chain to X. 8936 if (getLangOpts().CPlusPlus) { 8937 // FIXME: Look for a way to use RecordDecl for simple structs. 8938 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8939 cast_or_null<CXXRecordDecl>(PrevDecl)); 8940 8941 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8942 StdBadAlloc = cast<CXXRecordDecl>(New); 8943 } else 8944 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8945 cast_or_null<RecordDecl>(PrevDecl)); 8946 } 8947 8948 // Maybe add qualifier info. 8949 if (SS.isNotEmpty()) { 8950 if (SS.isSet()) { 8951 // If this is either a declaration or a definition, check the 8952 // nested-name-specifier against the current context. We don't do this 8953 // for explicit specializations, because they have similar checking 8954 // (with more specific diagnostics) in the call to 8955 // CheckMemberSpecialization, below. 8956 if (!isExplicitSpecialization && 8957 (TUK == TUK_Definition || TUK == TUK_Declaration) && 8958 diagnoseQualifiedDeclaration(SS, DC, OrigName, NameLoc)) 8959 Invalid = true; 8960 8961 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8962 if (TemplateParameterLists.size() > 0) { 8963 New->setTemplateParameterListsInfo(Context, 8964 TemplateParameterLists.size(), 8965 TemplateParameterLists.data()); 8966 } 8967 } 8968 else 8969 Invalid = true; 8970 } 8971 8972 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8973 // Add alignment attributes if necessary; these attributes are checked when 8974 // the ASTContext lays out the structure. 8975 // 8976 // It is important for implementing the correct semantics that this 8977 // happen here (in act on tag decl). The #pragma pack stack is 8978 // maintained as a result of parser callbacks which can occur at 8979 // many points during the parsing of a struct declaration (because 8980 // the #pragma tokens are effectively skipped over during the 8981 // parsing of the struct). 8982 if (TUK == TUK_Definition) { 8983 AddAlignmentAttributesForRecord(RD); 8984 AddMsStructLayoutForRecord(RD); 8985 } 8986 } 8987 8988 if (ModulePrivateLoc.isValid()) { 8989 if (isExplicitSpecialization) 8990 Diag(New->getLocation(), diag::err_module_private_specialization) 8991 << 2 8992 << FixItHint::CreateRemoval(ModulePrivateLoc); 8993 // __module_private__ does not apply to local classes. However, we only 8994 // diagnose this as an error when the declaration specifiers are 8995 // freestanding. Here, we just ignore the __module_private__. 8996 else if (!SearchDC->isFunctionOrMethod()) 8997 New->setModulePrivate(); 8998 } 8999 9000 // If this is a specialization of a member class (of a class template), 9001 // check the specialization. 9002 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 9003 Invalid = true; 9004 9005 if (Invalid) 9006 New->setInvalidDecl(); 9007 9008 if (Attr) 9009 ProcessDeclAttributeList(S, New, Attr); 9010 9011 // If we're declaring or defining a tag in function prototype scope 9012 // in C, note that this type can only be used within the function. 9013 if (Name && S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus) 9014 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 9015 9016 // Set the lexical context. If the tag has a C++ scope specifier, the 9017 // lexical context will be different from the semantic context. 9018 New->setLexicalDeclContext(CurContext); 9019 9020 // Mark this as a friend decl if applicable. 9021 // In Microsoft mode, a friend declaration also acts as a forward 9022 // declaration so we always pass true to setObjectOfFriendDecl to make 9023 // the tag name visible. 9024 if (TUK == TUK_Friend) 9025 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 9026 getLangOpts().MicrosoftExt); 9027 9028 // Set the access specifier. 9029 if (!Invalid && SearchDC->isRecord()) 9030 SetMemberAccessSpecifier(New, PrevDecl, AS); 9031 9032 if (TUK == TUK_Definition) 9033 New->startDefinition(); 9034 9035 // If this has an identifier, add it to the scope stack. 9036 if (TUK == TUK_Friend) { 9037 // We might be replacing an existing declaration in the lookup tables; 9038 // if so, borrow its access specifier. 9039 if (PrevDecl) 9040 New->setAccess(PrevDecl->getAccess()); 9041 9042 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 9043 DC->makeDeclVisibleInContext(New); 9044 if (Name) // can be null along some error paths 9045 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 9046 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 9047 } else if (Name) { 9048 S = getNonFieldDeclScope(S); 9049 PushOnScopeChains(New, S, !IsForwardReference); 9050 if (IsForwardReference) 9051 SearchDC->makeDeclVisibleInContext(New); 9052 9053 } else { 9054 CurContext->addDecl(New); 9055 } 9056 9057 // If this is the C FILE type, notify the AST context. 9058 if (IdentifierInfo *II = New->getIdentifier()) 9059 if (!New->isInvalidDecl() && 9060 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 9061 II->isStr("FILE")) 9062 Context.setFILEDecl(New); 9063 9064 // If we were in function prototype scope (and not in C++ mode), add this 9065 // tag to the list of decls to inject into the function definition scope. 9066 if (S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus && 9067 InFunctionDeclarator && Name) 9068 DeclsInPrototypeScope.push_back(New); 9069 9070 if (PrevDecl) 9071 mergeDeclAttributes(New, PrevDecl); 9072 9073 // If there's a #pragma GCC visibility in scope, set the visibility of this 9074 // record. 9075 AddPushedVisibilityAttribute(New); 9076 9077 OwnedDecl = true; 9078 return New; 9079} 9080 9081void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 9082 AdjustDeclIfTemplate(TagD); 9083 TagDecl *Tag = cast<TagDecl>(TagD); 9084 9085 // Enter the tag context. 9086 PushDeclContext(S, Tag); 9087 9088 ActOnDocumentableDecl(TagD); 9089 9090 // If there's a #pragma GCC visibility in scope, set the visibility of this 9091 // record. 9092 AddPushedVisibilityAttribute(Tag); 9093} 9094 9095Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 9096 assert(isa<ObjCContainerDecl>(IDecl) && 9097 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 9098 DeclContext *OCD = cast<DeclContext>(IDecl); 9099 assert(getContainingDC(OCD) == CurContext && 9100 "The next DeclContext should be lexically contained in the current one."); 9101 CurContext = OCD; 9102 return IDecl; 9103} 9104 9105void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 9106 SourceLocation FinalLoc, 9107 SourceLocation LBraceLoc) { 9108 AdjustDeclIfTemplate(TagD); 9109 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 9110 9111 FieldCollector->StartClass(); 9112 9113 if (!Record->getIdentifier()) 9114 return; 9115 9116 if (FinalLoc.isValid()) 9117 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 9118 9119 // C++ [class]p2: 9120 // [...] The class-name is also inserted into the scope of the 9121 // class itself; this is known as the injected-class-name. For 9122 // purposes of access checking, the injected-class-name is treated 9123 // as if it were a public member name. 9124 CXXRecordDecl *InjectedClassName 9125 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 9126 Record->getLocStart(), Record->getLocation(), 9127 Record->getIdentifier(), 9128 /*PrevDecl=*/0, 9129 /*DelayTypeCreation=*/true); 9130 Context.getTypeDeclType(InjectedClassName, Record); 9131 InjectedClassName->setImplicit(); 9132 InjectedClassName->setAccess(AS_public); 9133 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 9134 InjectedClassName->setDescribedClassTemplate(Template); 9135 PushOnScopeChains(InjectedClassName, S); 9136 assert(InjectedClassName->isInjectedClassName() && 9137 "Broken injected-class-name"); 9138} 9139 9140void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 9141 SourceLocation RBraceLoc) { 9142 AdjustDeclIfTemplate(TagD); 9143 TagDecl *Tag = cast<TagDecl>(TagD); 9144 Tag->setRBraceLoc(RBraceLoc); 9145 9146 // Make sure we "complete" the definition even it is invalid. 9147 if (Tag->isBeingDefined()) { 9148 assert(Tag->isInvalidDecl() && "We should already have completed it"); 9149 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 9150 RD->completeDefinition(); 9151 } 9152 9153 if (isa<CXXRecordDecl>(Tag)) 9154 FieldCollector->FinishClass(); 9155 9156 // Exit this scope of this tag's definition. 9157 PopDeclContext(); 9158 9159 // Notify the consumer that we've defined a tag. 9160 Consumer.HandleTagDeclDefinition(Tag); 9161} 9162 9163void Sema::ActOnObjCContainerFinishDefinition() { 9164 // Exit this scope of this interface definition. 9165 PopDeclContext(); 9166} 9167 9168void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 9169 assert(DC == CurContext && "Mismatch of container contexts"); 9170 OriginalLexicalContext = DC; 9171 ActOnObjCContainerFinishDefinition(); 9172} 9173 9174void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 9175 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 9176 OriginalLexicalContext = 0; 9177} 9178 9179void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 9180 AdjustDeclIfTemplate(TagD); 9181 TagDecl *Tag = cast<TagDecl>(TagD); 9182 Tag->setInvalidDecl(); 9183 9184 // Make sure we "complete" the definition even it is invalid. 9185 if (Tag->isBeingDefined()) { 9186 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 9187 RD->completeDefinition(); 9188 } 9189 9190 // We're undoing ActOnTagStartDefinition here, not 9191 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 9192 // the FieldCollector. 9193 9194 PopDeclContext(); 9195} 9196 9197// Note that FieldName may be null for anonymous bitfields. 9198ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 9199 IdentifierInfo *FieldName, 9200 QualType FieldTy, Expr *BitWidth, 9201 bool *ZeroWidth) { 9202 // Default to true; that shouldn't confuse checks for emptiness 9203 if (ZeroWidth) 9204 *ZeroWidth = true; 9205 9206 // C99 6.7.2.1p4 - verify the field type. 9207 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 9208 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 9209 // Handle incomplete types with specific error. 9210 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 9211 return ExprError(); 9212 if (FieldName) 9213 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 9214 << FieldName << FieldTy << BitWidth->getSourceRange(); 9215 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 9216 << FieldTy << BitWidth->getSourceRange(); 9217 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 9218 UPPC_BitFieldWidth)) 9219 return ExprError(); 9220 9221 // If the bit-width is type- or value-dependent, don't try to check 9222 // it now. 9223 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 9224 return Owned(BitWidth); 9225 9226 llvm::APSInt Value; 9227 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 9228 if (ICE.isInvalid()) 9229 return ICE; 9230 BitWidth = ICE.take(); 9231 9232 if (Value != 0 && ZeroWidth) 9233 *ZeroWidth = false; 9234 9235 // Zero-width bitfield is ok for anonymous field. 9236 if (Value == 0 && FieldName) 9237 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 9238 9239 if (Value.isSigned() && Value.isNegative()) { 9240 if (FieldName) 9241 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 9242 << FieldName << Value.toString(10); 9243 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 9244 << Value.toString(10); 9245 } 9246 9247 if (!FieldTy->isDependentType()) { 9248 uint64_t TypeSize = Context.getTypeSize(FieldTy); 9249 if (Value.getZExtValue() > TypeSize) { 9250 if (!getLangOpts().CPlusPlus) { 9251 if (FieldName) 9252 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 9253 << FieldName << (unsigned)Value.getZExtValue() 9254 << (unsigned)TypeSize; 9255 9256 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 9257 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 9258 } 9259 9260 if (FieldName) 9261 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 9262 << FieldName << (unsigned)Value.getZExtValue() 9263 << (unsigned)TypeSize; 9264 else 9265 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 9266 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 9267 } 9268 } 9269 9270 return Owned(BitWidth); 9271} 9272 9273/// ActOnField - Each field of a C struct/union is passed into this in order 9274/// to create a FieldDecl object for it. 9275Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 9276 Declarator &D, Expr *BitfieldWidth) { 9277 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 9278 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 9279 /*InitStyle=*/ICIS_NoInit, AS_public); 9280 return Res; 9281} 9282 9283/// HandleField - Analyze a field of a C struct or a C++ data member. 9284/// 9285FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 9286 SourceLocation DeclStart, 9287 Declarator &D, Expr *BitWidth, 9288 InClassInitStyle InitStyle, 9289 AccessSpecifier AS) { 9290 IdentifierInfo *II = D.getIdentifier(); 9291 SourceLocation Loc = DeclStart; 9292 if (II) Loc = D.getIdentifierLoc(); 9293 9294 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9295 QualType T = TInfo->getType(); 9296 if (getLangOpts().CPlusPlus) { 9297 CheckExtraCXXDefaultArguments(D); 9298 9299 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9300 UPPC_DataMemberType)) { 9301 D.setInvalidType(); 9302 T = Context.IntTy; 9303 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 9304 } 9305 } 9306 9307 DiagnoseFunctionSpecifiers(D); 9308 9309 if (D.getDeclSpec().isThreadSpecified()) 9310 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 9311 if (D.getDeclSpec().isConstexprSpecified()) 9312 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 9313 << 2; 9314 9315 // Check to see if this name was declared as a member previously 9316 NamedDecl *PrevDecl = 0; 9317 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 9318 LookupName(Previous, S); 9319 switch (Previous.getResultKind()) { 9320 case LookupResult::Found: 9321 case LookupResult::FoundUnresolvedValue: 9322 PrevDecl = Previous.getAsSingle<NamedDecl>(); 9323 break; 9324 9325 case LookupResult::FoundOverloaded: 9326 PrevDecl = Previous.getRepresentativeDecl(); 9327 break; 9328 9329 case LookupResult::NotFound: 9330 case LookupResult::NotFoundInCurrentInstantiation: 9331 case LookupResult::Ambiguous: 9332 break; 9333 } 9334 Previous.suppressDiagnostics(); 9335 9336 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9337 // Maybe we will complain about the shadowed template parameter. 9338 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9339 // Just pretend that we didn't see the previous declaration. 9340 PrevDecl = 0; 9341 } 9342 9343 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 9344 PrevDecl = 0; 9345 9346 bool Mutable 9347 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 9348 SourceLocation TSSL = D.getLocStart(); 9349 FieldDecl *NewFD 9350 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, InitStyle, 9351 TSSL, AS, PrevDecl, &D); 9352 9353 if (NewFD->isInvalidDecl()) 9354 Record->setInvalidDecl(); 9355 9356 if (D.getDeclSpec().isModulePrivateSpecified()) 9357 NewFD->setModulePrivate(); 9358 9359 if (NewFD->isInvalidDecl() && PrevDecl) { 9360 // Don't introduce NewFD into scope; there's already something 9361 // with the same name in the same scope. 9362 } else if (II) { 9363 PushOnScopeChains(NewFD, S); 9364 } else 9365 Record->addDecl(NewFD); 9366 9367 return NewFD; 9368} 9369 9370/// \brief Build a new FieldDecl and check its well-formedness. 9371/// 9372/// This routine builds a new FieldDecl given the fields name, type, 9373/// record, etc. \p PrevDecl should refer to any previous declaration 9374/// with the same name and in the same scope as the field to be 9375/// created. 9376/// 9377/// \returns a new FieldDecl. 9378/// 9379/// \todo The Declarator argument is a hack. It will be removed once 9380FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 9381 TypeSourceInfo *TInfo, 9382 RecordDecl *Record, SourceLocation Loc, 9383 bool Mutable, Expr *BitWidth, 9384 InClassInitStyle InitStyle, 9385 SourceLocation TSSL, 9386 AccessSpecifier AS, NamedDecl *PrevDecl, 9387 Declarator *D) { 9388 IdentifierInfo *II = Name.getAsIdentifierInfo(); 9389 bool InvalidDecl = false; 9390 if (D) InvalidDecl = D->isInvalidType(); 9391 9392 // If we receive a broken type, recover by assuming 'int' and 9393 // marking this declaration as invalid. 9394 if (T.isNull()) { 9395 InvalidDecl = true; 9396 T = Context.IntTy; 9397 } 9398 9399 QualType EltTy = Context.getBaseElementType(T); 9400 if (!EltTy->isDependentType()) { 9401 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 9402 // Fields of incomplete type force their record to be invalid. 9403 Record->setInvalidDecl(); 9404 InvalidDecl = true; 9405 } else { 9406 NamedDecl *Def; 9407 EltTy->isIncompleteType(&Def); 9408 if (Def && Def->isInvalidDecl()) { 9409 Record->setInvalidDecl(); 9410 InvalidDecl = true; 9411 } 9412 } 9413 } 9414 9415 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9416 // than a variably modified type. 9417 if (!InvalidDecl && T->isVariablyModifiedType()) { 9418 bool SizeIsNegative; 9419 llvm::APSInt Oversized; 9420 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 9421 SizeIsNegative, 9422 Oversized); 9423 if (!FixedTy.isNull()) { 9424 Diag(Loc, diag::warn_illegal_constant_array_size); 9425 T = FixedTy; 9426 } else { 9427 if (SizeIsNegative) 9428 Diag(Loc, diag::err_typecheck_negative_array_size); 9429 else if (Oversized.getBoolValue()) 9430 Diag(Loc, diag::err_array_too_large) 9431 << Oversized.toString(10); 9432 else 9433 Diag(Loc, diag::err_typecheck_field_variable_size); 9434 InvalidDecl = true; 9435 } 9436 } 9437 9438 // Fields can not have abstract class types 9439 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 9440 diag::err_abstract_type_in_decl, 9441 AbstractFieldType)) 9442 InvalidDecl = true; 9443 9444 bool ZeroWidth = false; 9445 // If this is declared as a bit-field, check the bit-field. 9446 if (!InvalidDecl && BitWidth) { 9447 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 9448 if (!BitWidth) { 9449 InvalidDecl = true; 9450 BitWidth = 0; 9451 ZeroWidth = false; 9452 } 9453 } 9454 9455 // Check that 'mutable' is consistent with the type of the declaration. 9456 if (!InvalidDecl && Mutable) { 9457 unsigned DiagID = 0; 9458 if (T->isReferenceType()) 9459 DiagID = diag::err_mutable_reference; 9460 else if (T.isConstQualified()) 9461 DiagID = diag::err_mutable_const; 9462 9463 if (DiagID) { 9464 SourceLocation ErrLoc = Loc; 9465 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 9466 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 9467 Diag(ErrLoc, DiagID); 9468 Mutable = false; 9469 InvalidDecl = true; 9470 } 9471 } 9472 9473 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 9474 BitWidth, Mutable, InitStyle); 9475 if (InvalidDecl) 9476 NewFD->setInvalidDecl(); 9477 9478 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 9479 Diag(Loc, diag::err_duplicate_member) << II; 9480 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9481 NewFD->setInvalidDecl(); 9482 } 9483 9484 if (!InvalidDecl && getLangOpts().CPlusPlus) { 9485 if (Record->isUnion()) { 9486 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9487 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9488 if (RDecl->getDefinition()) { 9489 // C++ [class.union]p1: An object of a class with a non-trivial 9490 // constructor, a non-trivial copy constructor, a non-trivial 9491 // destructor, or a non-trivial copy assignment operator 9492 // cannot be a member of a union, nor can an array of such 9493 // objects. 9494 if (CheckNontrivialField(NewFD)) 9495 NewFD->setInvalidDecl(); 9496 } 9497 } 9498 9499 // C++ [class.union]p1: If a union contains a member of reference type, 9500 // the program is ill-formed. 9501 if (EltTy->isReferenceType()) { 9502 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 9503 << NewFD->getDeclName() << EltTy; 9504 NewFD->setInvalidDecl(); 9505 } 9506 } 9507 } 9508 9509 // FIXME: We need to pass in the attributes given an AST 9510 // representation, not a parser representation. 9511 if (D) 9512 // FIXME: What to pass instead of TUScope? 9513 ProcessDeclAttributes(TUScope, NewFD, *D); 9514 9515 // In auto-retain/release, infer strong retension for fields of 9516 // retainable type. 9517 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 9518 NewFD->setInvalidDecl(); 9519 9520 if (T.isObjCGCWeak()) 9521 Diag(Loc, diag::warn_attribute_weak_on_field); 9522 9523 NewFD->setAccess(AS); 9524 return NewFD; 9525} 9526 9527bool Sema::CheckNontrivialField(FieldDecl *FD) { 9528 assert(FD); 9529 assert(getLangOpts().CPlusPlus && "valid check only for C++"); 9530 9531 if (FD->isInvalidDecl()) 9532 return true; 9533 9534 QualType EltTy = Context.getBaseElementType(FD->getType()); 9535 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9536 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9537 if (RDecl->getDefinition()) { 9538 // We check for copy constructors before constructors 9539 // because otherwise we'll never get complaints about 9540 // copy constructors. 9541 9542 CXXSpecialMember member = CXXInvalid; 9543 if (!RDecl->hasTrivialCopyConstructor()) 9544 member = CXXCopyConstructor; 9545 else if (!RDecl->hasTrivialDefaultConstructor()) 9546 member = CXXDefaultConstructor; 9547 else if (!RDecl->hasTrivialCopyAssignment()) 9548 member = CXXCopyAssignment; 9549 else if (!RDecl->hasTrivialDestructor()) 9550 member = CXXDestructor; 9551 9552 if (member != CXXInvalid) { 9553 if (!getLangOpts().CPlusPlus0x && 9554 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) { 9555 // Objective-C++ ARC: it is an error to have a non-trivial field of 9556 // a union. However, system headers in Objective-C programs 9557 // occasionally have Objective-C lifetime objects within unions, 9558 // and rather than cause the program to fail, we make those 9559 // members unavailable. 9560 SourceLocation Loc = FD->getLocation(); 9561 if (getSourceManager().isInSystemHeader(Loc)) { 9562 if (!FD->hasAttr<UnavailableAttr>()) 9563 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 9564 "this system field has retaining ownership")); 9565 return false; 9566 } 9567 } 9568 9569 Diag(FD->getLocation(), getLangOpts().CPlusPlus0x ? 9570 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 9571 diag::err_illegal_union_or_anon_struct_member) 9572 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 9573 DiagnoseNontrivial(RT, member); 9574 return !getLangOpts().CPlusPlus0x; 9575 } 9576 } 9577 } 9578 9579 return false; 9580} 9581 9582/// If the given constructor is user-declared, produce a diagnostic explaining 9583/// that it makes the class non-trivial. 9584static bool diagnoseNonTrivialUserDeclaredCtor(Sema &S, QualType QT, 9585 CXXConstructorDecl *CD, 9586 Sema::CXXSpecialMember CSM) { 9587 if (CD->isImplicit()) 9588 return false; 9589 9590 SourceLocation CtorLoc = CD->getLocation(); 9591 S.Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << CSM; 9592 return true; 9593} 9594 9595/// DiagnoseNontrivial - Given that a class has a non-trivial 9596/// special member, figure out why. 9597void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 9598 QualType QT(T, 0U); 9599 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 9600 9601 // Check whether the member was user-declared. 9602 switch (member) { 9603 case CXXInvalid: 9604 break; 9605 9606 case CXXDefaultConstructor: 9607 if (RD->hasUserDeclaredConstructor()) { 9608 typedef CXXRecordDecl::ctor_iterator ctor_iter; 9609 for (ctor_iter CI = RD->ctor_begin(), CE = RD->ctor_end(); CI != CE; ++CI) 9610 if (diagnoseNonTrivialUserDeclaredCtor(*this, QT, *CI, member)) 9611 return; 9612 9613 // No user-delcared constructors; look for constructor templates. 9614 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 9615 tmpl_iter; 9616 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); 9617 TI != TE; ++TI) { 9618 CXXConstructorDecl *CD = 9619 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()); 9620 if (CD && diagnoseNonTrivialUserDeclaredCtor(*this, QT, CD, member)) 9621 return; 9622 } 9623 } 9624 break; 9625 9626 case CXXCopyConstructor: 9627 if (RD->hasUserDeclaredCopyConstructor()) { 9628 SourceLocation CtorLoc = 9629 RD->getCopyConstructor(0)->getLocation(); 9630 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9631 return; 9632 } 9633 break; 9634 9635 case CXXMoveConstructor: 9636 if (RD->hasUserDeclaredMoveConstructor()) { 9637 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 9638 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9639 return; 9640 } 9641 break; 9642 9643 case CXXCopyAssignment: 9644 if (RD->hasUserDeclaredCopyAssignment()) { 9645 SourceLocation AssignLoc = 9646 RD->getCopyAssignmentOperator(0)->getLocation(); 9647 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9648 return; 9649 } 9650 break; 9651 9652 case CXXMoveAssignment: 9653 if (RD->hasUserDeclaredMoveAssignment()) { 9654 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 9655 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9656 return; 9657 } 9658 break; 9659 9660 case CXXDestructor: 9661 if (RD->hasUserDeclaredDestructor()) { 9662 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 9663 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9664 return; 9665 } 9666 break; 9667 } 9668 9669 typedef CXXRecordDecl::base_class_iterator base_iter; 9670 9671 // Virtual bases and members inhibit trivial copying/construction, 9672 // but not trivial destruction. 9673 if (member != CXXDestructor) { 9674 // Check for virtual bases. vbases includes indirect virtual bases, 9675 // so we just iterate through the direct bases. 9676 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 9677 if (bi->isVirtual()) { 9678 SourceLocation BaseLoc = bi->getLocStart(); 9679 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 9680 return; 9681 } 9682 9683 // Check for virtual methods. 9684 typedef CXXRecordDecl::method_iterator meth_iter; 9685 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 9686 ++mi) { 9687 if (mi->isVirtual()) { 9688 SourceLocation MLoc = mi->getLocStart(); 9689 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 9690 return; 9691 } 9692 } 9693 } 9694 9695 bool (CXXRecordDecl::*hasTrivial)() const; 9696 switch (member) { 9697 case CXXDefaultConstructor: 9698 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 9699 case CXXCopyConstructor: 9700 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 9701 case CXXCopyAssignment: 9702 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 9703 case CXXDestructor: 9704 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 9705 default: 9706 llvm_unreachable("unexpected special member"); 9707 } 9708 9709 // Check for nontrivial bases (and recurse). 9710 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 9711 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 9712 assert(BaseRT && "Don't know how to handle dependent bases"); 9713 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 9714 if (!(BaseRecTy->*hasTrivial)()) { 9715 SourceLocation BaseLoc = bi->getLocStart(); 9716 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 9717 DiagnoseNontrivial(BaseRT, member); 9718 return; 9719 } 9720 } 9721 9722 // Check for nontrivial members (and recurse). 9723 typedef RecordDecl::field_iterator field_iter; 9724 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 9725 ++fi) { 9726 QualType EltTy = Context.getBaseElementType(fi->getType()); 9727 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 9728 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 9729 9730 if (!(EltRD->*hasTrivial)()) { 9731 SourceLocation FLoc = fi->getLocation(); 9732 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 9733 DiagnoseNontrivial(EltRT, member); 9734 return; 9735 } 9736 } 9737 9738 if (EltTy->isObjCLifetimeType()) { 9739 switch (EltTy.getObjCLifetime()) { 9740 case Qualifiers::OCL_None: 9741 case Qualifiers::OCL_ExplicitNone: 9742 break; 9743 9744 case Qualifiers::OCL_Autoreleasing: 9745 case Qualifiers::OCL_Weak: 9746 case Qualifiers::OCL_Strong: 9747 Diag(fi->getLocation(), diag::note_nontrivial_objc_ownership) 9748 << QT << EltTy.getObjCLifetime(); 9749 return; 9750 } 9751 } 9752 } 9753 9754 llvm_unreachable("found no explanation for non-trivial member"); 9755} 9756 9757/// TranslateIvarVisibility - Translate visibility from a token ID to an 9758/// AST enum value. 9759static ObjCIvarDecl::AccessControl 9760TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9761 switch (ivarVisibility) { 9762 default: llvm_unreachable("Unknown visitibility kind"); 9763 case tok::objc_private: return ObjCIvarDecl::Private; 9764 case tok::objc_public: return ObjCIvarDecl::Public; 9765 case tok::objc_protected: return ObjCIvarDecl::Protected; 9766 case tok::objc_package: return ObjCIvarDecl::Package; 9767 } 9768} 9769 9770/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9771/// in order to create an IvarDecl object for it. 9772Decl *Sema::ActOnIvar(Scope *S, 9773 SourceLocation DeclStart, 9774 Declarator &D, Expr *BitfieldWidth, 9775 tok::ObjCKeywordKind Visibility) { 9776 9777 IdentifierInfo *II = D.getIdentifier(); 9778 Expr *BitWidth = (Expr*)BitfieldWidth; 9779 SourceLocation Loc = DeclStart; 9780 if (II) Loc = D.getIdentifierLoc(); 9781 9782 // FIXME: Unnamed fields can be handled in various different ways, for 9783 // example, unnamed unions inject all members into the struct namespace! 9784 9785 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9786 QualType T = TInfo->getType(); 9787 9788 if (BitWidth) { 9789 // 6.7.2.1p3, 6.7.2.1p4 9790 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9791 if (!BitWidth) 9792 D.setInvalidType(); 9793 } else { 9794 // Not a bitfield. 9795 9796 // validate II. 9797 9798 } 9799 if (T->isReferenceType()) { 9800 Diag(Loc, diag::err_ivar_reference_type); 9801 D.setInvalidType(); 9802 } 9803 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9804 // than a variably modified type. 9805 else if (T->isVariablyModifiedType()) { 9806 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9807 D.setInvalidType(); 9808 } 9809 9810 // Get the visibility (access control) for this ivar. 9811 ObjCIvarDecl::AccessControl ac = 9812 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9813 : ObjCIvarDecl::None; 9814 // Must set ivar's DeclContext to its enclosing interface. 9815 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9816 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9817 return 0; 9818 ObjCContainerDecl *EnclosingContext; 9819 if (ObjCImplementationDecl *IMPDecl = 9820 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9821 if (LangOpts.ObjCRuntime.isFragile()) { 9822 // Case of ivar declared in an implementation. Context is that of its class. 9823 EnclosingContext = IMPDecl->getClassInterface(); 9824 assert(EnclosingContext && "Implementation has no class interface!"); 9825 } 9826 else 9827 EnclosingContext = EnclosingDecl; 9828 } else { 9829 if (ObjCCategoryDecl *CDecl = 9830 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9831 if (LangOpts.ObjCRuntime.isFragile() || !CDecl->IsClassExtension()) { 9832 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9833 return 0; 9834 } 9835 } 9836 EnclosingContext = EnclosingDecl; 9837 } 9838 9839 // Construct the decl. 9840 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9841 DeclStart, Loc, II, T, 9842 TInfo, ac, (Expr *)BitfieldWidth); 9843 9844 if (II) { 9845 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9846 ForRedeclaration); 9847 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9848 && !isa<TagDecl>(PrevDecl)) { 9849 Diag(Loc, diag::err_duplicate_member) << II; 9850 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9851 NewID->setInvalidDecl(); 9852 } 9853 } 9854 9855 // Process attributes attached to the ivar. 9856 ProcessDeclAttributes(S, NewID, D); 9857 9858 if (D.isInvalidType()) 9859 NewID->setInvalidDecl(); 9860 9861 // In ARC, infer 'retaining' for ivars of retainable type. 9862 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9863 NewID->setInvalidDecl(); 9864 9865 if (D.getDeclSpec().isModulePrivateSpecified()) 9866 NewID->setModulePrivate(); 9867 9868 if (II) { 9869 // FIXME: When interfaces are DeclContexts, we'll need to add 9870 // these to the interface. 9871 S->AddDecl(NewID); 9872 IdResolver.AddDecl(NewID); 9873 } 9874 9875 if (LangOpts.ObjCRuntime.isNonFragile() && 9876 !NewID->isInvalidDecl() && isa<ObjCInterfaceDecl>(EnclosingDecl)) 9877 Diag(Loc, diag::warn_ivars_in_interface); 9878 9879 return NewID; 9880} 9881 9882/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9883/// class and class extensions. For every class @interface and class 9884/// extension @interface, if the last ivar is a bitfield of any type, 9885/// then add an implicit `char :0` ivar to the end of that interface. 9886void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9887 SmallVectorImpl<Decl *> &AllIvarDecls) { 9888 if (LangOpts.ObjCRuntime.isFragile() || AllIvarDecls.empty()) 9889 return; 9890 9891 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9892 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9893 9894 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9895 return; 9896 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9897 if (!ID) { 9898 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9899 if (!CD->IsClassExtension()) 9900 return; 9901 } 9902 // No need to add this to end of @implementation. 9903 else 9904 return; 9905 } 9906 // All conditions are met. Add a new bitfield to the tail end of ivars. 9907 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9908 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9909 9910 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9911 DeclLoc, DeclLoc, 0, 9912 Context.CharTy, 9913 Context.getTrivialTypeSourceInfo(Context.CharTy, 9914 DeclLoc), 9915 ObjCIvarDecl::Private, BW, 9916 true); 9917 AllIvarDecls.push_back(Ivar); 9918} 9919 9920void Sema::ActOnFields(Scope* S, 9921 SourceLocation RecLoc, Decl *EnclosingDecl, 9922 llvm::ArrayRef<Decl *> Fields, 9923 SourceLocation LBrac, SourceLocation RBrac, 9924 AttributeList *Attr) { 9925 assert(EnclosingDecl && "missing record or interface decl"); 9926 9927 // If this is an Objective-C @implementation or category and we have 9928 // new fields here we should reset the layout of the interface since 9929 // it will now change. 9930 if (!Fields.empty() && isa<ObjCContainerDecl>(EnclosingDecl)) { 9931 ObjCContainerDecl *DC = cast<ObjCContainerDecl>(EnclosingDecl); 9932 switch (DC->getKind()) { 9933 default: break; 9934 case Decl::ObjCCategory: 9935 Context.ResetObjCLayout(cast<ObjCCategoryDecl>(DC)->getClassInterface()); 9936 break; 9937 case Decl::ObjCImplementation: 9938 Context. 9939 ResetObjCLayout(cast<ObjCImplementationDecl>(DC)->getClassInterface()); 9940 break; 9941 } 9942 } 9943 9944 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9945 9946 // Start counting up the number of named members; make sure to include 9947 // members of anonymous structs and unions in the total. 9948 unsigned NumNamedMembers = 0; 9949 if (Record) { 9950 for (RecordDecl::decl_iterator i = Record->decls_begin(), 9951 e = Record->decls_end(); i != e; i++) { 9952 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i)) 9953 if (IFD->getDeclName()) 9954 ++NumNamedMembers; 9955 } 9956 } 9957 9958 // Verify that all the fields are okay. 9959 SmallVector<FieldDecl*, 32> RecFields; 9960 9961 bool ARCErrReported = false; 9962 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9963 i != end; ++i) { 9964 FieldDecl *FD = cast<FieldDecl>(*i); 9965 9966 // Get the type for the field. 9967 const Type *FDTy = FD->getType().getTypePtr(); 9968 9969 if (!FD->isAnonymousStructOrUnion()) { 9970 // Remember all fields written by the user. 9971 RecFields.push_back(FD); 9972 } 9973 9974 // If the field is already invalid for some reason, don't emit more 9975 // diagnostics about it. 9976 if (FD->isInvalidDecl()) { 9977 EnclosingDecl->setInvalidDecl(); 9978 continue; 9979 } 9980 9981 // C99 6.7.2.1p2: 9982 // A structure or union shall not contain a member with 9983 // incomplete or function type (hence, a structure shall not 9984 // contain an instance of itself, but may contain a pointer to 9985 // an instance of itself), except that the last member of a 9986 // structure with more than one named member may have incomplete 9987 // array type; such a structure (and any union containing, 9988 // possibly recursively, a member that is such a structure) 9989 // shall not be a member of a structure or an element of an 9990 // array. 9991 if (FDTy->isFunctionType()) { 9992 // Field declared as a function. 9993 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9994 << FD->getDeclName(); 9995 FD->setInvalidDecl(); 9996 EnclosingDecl->setInvalidDecl(); 9997 continue; 9998 } else if (FDTy->isIncompleteArrayType() && Record && 9999 ((i + 1 == Fields.end() && !Record->isUnion()) || 10000 ((getLangOpts().MicrosoftExt || 10001 getLangOpts().CPlusPlus) && 10002 (i + 1 == Fields.end() || Record->isUnion())))) { 10003 // Flexible array member. 10004 // Microsoft and g++ is more permissive regarding flexible array. 10005 // It will accept flexible array in union and also 10006 // as the sole element of a struct/class. 10007 if (getLangOpts().MicrosoftExt) { 10008 if (Record->isUnion()) 10009 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 10010 << FD->getDeclName(); 10011 else if (Fields.size() == 1) 10012 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 10013 << FD->getDeclName() << Record->getTagKind(); 10014 } else if (getLangOpts().CPlusPlus) { 10015 if (Record->isUnion()) 10016 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 10017 << FD->getDeclName(); 10018 else if (Fields.size() == 1) 10019 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 10020 << FD->getDeclName() << Record->getTagKind(); 10021 } else if (!getLangOpts().C99) { 10022 if (Record->isUnion()) 10023 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 10024 << FD->getDeclName(); 10025 else 10026 Diag(FD->getLocation(), diag::ext_c99_flexible_array_member) 10027 << FD->getDeclName() << Record->getTagKind(); 10028 } else if (NumNamedMembers < 1) { 10029 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 10030 << FD->getDeclName(); 10031 FD->setInvalidDecl(); 10032 EnclosingDecl->setInvalidDecl(); 10033 continue; 10034 } 10035 if (!FD->getType()->isDependentType() && 10036 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 10037 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 10038 << FD->getDeclName() << FD->getType(); 10039 FD->setInvalidDecl(); 10040 EnclosingDecl->setInvalidDecl(); 10041 continue; 10042 } 10043 // Okay, we have a legal flexible array member at the end of the struct. 10044 if (Record) 10045 Record->setHasFlexibleArrayMember(true); 10046 } else if (!FDTy->isDependentType() && 10047 RequireCompleteType(FD->getLocation(), FD->getType(), 10048 diag::err_field_incomplete)) { 10049 // Incomplete type 10050 FD->setInvalidDecl(); 10051 EnclosingDecl->setInvalidDecl(); 10052 continue; 10053 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 10054 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 10055 // If this is a member of a union, then entire union becomes "flexible". 10056 if (Record && Record->isUnion()) { 10057 Record->setHasFlexibleArrayMember(true); 10058 } else { 10059 // If this is a struct/class and this is not the last element, reject 10060 // it. Note that GCC supports variable sized arrays in the middle of 10061 // structures. 10062 if (i + 1 != Fields.end()) 10063 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 10064 << FD->getDeclName() << FD->getType(); 10065 else { 10066 // We support flexible arrays at the end of structs in 10067 // other structs as an extension. 10068 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 10069 << FD->getDeclName(); 10070 if (Record) 10071 Record->setHasFlexibleArrayMember(true); 10072 } 10073 } 10074 } 10075 if (isa<ObjCContainerDecl>(EnclosingDecl) && 10076 RequireNonAbstractType(FD->getLocation(), FD->getType(), 10077 diag::err_abstract_type_in_decl, 10078 AbstractIvarType)) { 10079 // Ivars can not have abstract class types 10080 FD->setInvalidDecl(); 10081 } 10082 if (Record && FDTTy->getDecl()->hasObjectMember()) 10083 Record->setHasObjectMember(true); 10084 } else if (FDTy->isObjCObjectType()) { 10085 /// A field cannot be an Objective-c object 10086 Diag(FD->getLocation(), diag::err_statically_allocated_object) 10087 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 10088 QualType T = Context.getObjCObjectPointerType(FD->getType()); 10089 FD->setType(T); 10090 } else if (!getLangOpts().CPlusPlus) { 10091 if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported) { 10092 // It's an error in ARC if a field has lifetime. 10093 // We don't want to report this in a system header, though, 10094 // so we just make the field unavailable. 10095 // FIXME: that's really not sufficient; we need to make the type 10096 // itself invalid to, say, initialize or copy. 10097 QualType T = FD->getType(); 10098 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 10099 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 10100 SourceLocation loc = FD->getLocation(); 10101 if (getSourceManager().isInSystemHeader(loc)) { 10102 if (!FD->hasAttr<UnavailableAttr>()) { 10103 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 10104 "this system field has retaining ownership")); 10105 } 10106 } else { 10107 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 10108 << T->isBlockPointerType(); 10109 } 10110 ARCErrReported = true; 10111 } 10112 } 10113 else if (getLangOpts().ObjC1 && 10114 getLangOpts().getGC() != LangOptions::NonGC && 10115 Record && !Record->hasObjectMember()) { 10116 if (FD->getType()->isObjCObjectPointerType() || 10117 FD->getType().isObjCGCStrong()) 10118 Record->setHasObjectMember(true); 10119 else if (Context.getAsArrayType(FD->getType())) { 10120 QualType BaseType = Context.getBaseElementType(FD->getType()); 10121 if (BaseType->isRecordType() && 10122 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 10123 Record->setHasObjectMember(true); 10124 else if (BaseType->isObjCObjectPointerType() || 10125 BaseType.isObjCGCStrong()) 10126 Record->setHasObjectMember(true); 10127 } 10128 } 10129 } 10130 // Keep track of the number of named members. 10131 if (FD->getIdentifier()) 10132 ++NumNamedMembers; 10133 } 10134 10135 // Okay, we successfully defined 'Record'. 10136 if (Record) { 10137 bool Completed = false; 10138 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 10139 if (!CXXRecord->isInvalidDecl()) { 10140 // Set access bits correctly on the directly-declared conversions. 10141 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 10142 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 10143 I != E; ++I) 10144 Convs->setAccess(I, (*I)->getAccess()); 10145 10146 if (!CXXRecord->isDependentType()) { 10147 // Adjust user-defined destructor exception spec. 10148 if (getLangOpts().CPlusPlus0x && 10149 CXXRecord->hasUserDeclaredDestructor()) 10150 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 10151 10152 // Add any implicitly-declared members to this class. 10153 AddImplicitlyDeclaredMembersToClass(CXXRecord); 10154 10155 // If we have virtual base classes, we may end up finding multiple 10156 // final overriders for a given virtual function. Check for this 10157 // problem now. 10158 if (CXXRecord->getNumVBases()) { 10159 CXXFinalOverriderMap FinalOverriders; 10160 CXXRecord->getFinalOverriders(FinalOverriders); 10161 10162 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 10163 MEnd = FinalOverriders.end(); 10164 M != MEnd; ++M) { 10165 for (OverridingMethods::iterator SO = M->second.begin(), 10166 SOEnd = M->second.end(); 10167 SO != SOEnd; ++SO) { 10168 assert(SO->second.size() > 0 && 10169 "Virtual function without overridding functions?"); 10170 if (SO->second.size() == 1) 10171 continue; 10172 10173 // C++ [class.virtual]p2: 10174 // In a derived class, if a virtual member function of a base 10175 // class subobject has more than one final overrider the 10176 // program is ill-formed. 10177 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 10178 << (const NamedDecl *)M->first << Record; 10179 Diag(M->first->getLocation(), 10180 diag::note_overridden_virtual_function); 10181 for (OverridingMethods::overriding_iterator 10182 OM = SO->second.begin(), 10183 OMEnd = SO->second.end(); 10184 OM != OMEnd; ++OM) 10185 Diag(OM->Method->getLocation(), diag::note_final_overrider) 10186 << (const NamedDecl *)M->first << OM->Method->getParent(); 10187 10188 Record->setInvalidDecl(); 10189 } 10190 } 10191 CXXRecord->completeDefinition(&FinalOverriders); 10192 Completed = true; 10193 } 10194 } 10195 } 10196 } 10197 10198 if (!Completed) 10199 Record->completeDefinition(); 10200 10201 } else { 10202 ObjCIvarDecl **ClsFields = 10203 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 10204 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 10205 ID->setEndOfDefinitionLoc(RBrac); 10206 // Add ivar's to class's DeclContext. 10207 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 10208 ClsFields[i]->setLexicalDeclContext(ID); 10209 ID->addDecl(ClsFields[i]); 10210 } 10211 // Must enforce the rule that ivars in the base classes may not be 10212 // duplicates. 10213 if (ID->getSuperClass()) 10214 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 10215 } else if (ObjCImplementationDecl *IMPDecl = 10216 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 10217 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 10218 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 10219 // Ivar declared in @implementation never belongs to the implementation. 10220 // Only it is in implementation's lexical context. 10221 ClsFields[I]->setLexicalDeclContext(IMPDecl); 10222 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 10223 IMPDecl->setIvarLBraceLoc(LBrac); 10224 IMPDecl->setIvarRBraceLoc(RBrac); 10225 } else if (ObjCCategoryDecl *CDecl = 10226 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 10227 // case of ivars in class extension; all other cases have been 10228 // reported as errors elsewhere. 10229 // FIXME. Class extension does not have a LocEnd field. 10230 // CDecl->setLocEnd(RBrac); 10231 // Add ivar's to class extension's DeclContext. 10232 // Diagnose redeclaration of private ivars. 10233 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 10234 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 10235 if (IDecl) { 10236 if (const ObjCIvarDecl *ClsIvar = 10237 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 10238 Diag(ClsFields[i]->getLocation(), 10239 diag::err_duplicate_ivar_declaration); 10240 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 10241 continue; 10242 } 10243 for (const ObjCCategoryDecl *ClsExtDecl = 10244 IDecl->getFirstClassExtension(); 10245 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 10246 if (const ObjCIvarDecl *ClsExtIvar = 10247 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 10248 Diag(ClsFields[i]->getLocation(), 10249 diag::err_duplicate_ivar_declaration); 10250 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 10251 continue; 10252 } 10253 } 10254 } 10255 ClsFields[i]->setLexicalDeclContext(CDecl); 10256 CDecl->addDecl(ClsFields[i]); 10257 } 10258 CDecl->setIvarLBraceLoc(LBrac); 10259 CDecl->setIvarRBraceLoc(RBrac); 10260 } 10261 } 10262 10263 if (Attr) 10264 ProcessDeclAttributeList(S, Record, Attr); 10265} 10266 10267/// \brief Determine whether the given integral value is representable within 10268/// the given type T. 10269static bool isRepresentableIntegerValue(ASTContext &Context, 10270 llvm::APSInt &Value, 10271 QualType T) { 10272 assert(T->isIntegralType(Context) && "Integral type required!"); 10273 unsigned BitWidth = Context.getIntWidth(T); 10274 10275 if (Value.isUnsigned() || Value.isNonNegative()) { 10276 if (T->isSignedIntegerOrEnumerationType()) 10277 --BitWidth; 10278 return Value.getActiveBits() <= BitWidth; 10279 } 10280 return Value.getMinSignedBits() <= BitWidth; 10281} 10282 10283// \brief Given an integral type, return the next larger integral type 10284// (or a NULL type of no such type exists). 10285static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 10286 // FIXME: Int128/UInt128 support, which also needs to be introduced into 10287 // enum checking below. 10288 assert(T->isIntegralType(Context) && "Integral type required!"); 10289 const unsigned NumTypes = 4; 10290 QualType SignedIntegralTypes[NumTypes] = { 10291 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 10292 }; 10293 QualType UnsignedIntegralTypes[NumTypes] = { 10294 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 10295 Context.UnsignedLongLongTy 10296 }; 10297 10298 unsigned BitWidth = Context.getTypeSize(T); 10299 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 10300 : UnsignedIntegralTypes; 10301 for (unsigned I = 0; I != NumTypes; ++I) 10302 if (Context.getTypeSize(Types[I]) > BitWidth) 10303 return Types[I]; 10304 10305 return QualType(); 10306} 10307 10308EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 10309 EnumConstantDecl *LastEnumConst, 10310 SourceLocation IdLoc, 10311 IdentifierInfo *Id, 10312 Expr *Val) { 10313 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10314 llvm::APSInt EnumVal(IntWidth); 10315 QualType EltTy; 10316 10317 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 10318 Val = 0; 10319 10320 if (Val) 10321 Val = DefaultLvalueConversion(Val).take(); 10322 10323 if (Val) { 10324 if (Enum->isDependentType() || Val->isTypeDependent()) 10325 EltTy = Context.DependentTy; 10326 else { 10327 SourceLocation ExpLoc; 10328 if (getLangOpts().CPlusPlus0x && Enum->isFixed() && 10329 !getLangOpts().MicrosoftMode) { 10330 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 10331 // constant-expression in the enumerator-definition shall be a converted 10332 // constant expression of the underlying type. 10333 EltTy = Enum->getIntegerType(); 10334 ExprResult Converted = 10335 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 10336 CCEK_Enumerator); 10337 if (Converted.isInvalid()) 10338 Val = 0; 10339 else 10340 Val = Converted.take(); 10341 } else if (!Val->isValueDependent() && 10342 !(Val = VerifyIntegerConstantExpression(Val, 10343 &EnumVal).take())) { 10344 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 10345 } else { 10346 if (Enum->isFixed()) { 10347 EltTy = Enum->getIntegerType(); 10348 10349 // In Obj-C and Microsoft mode, require the enumeration value to be 10350 // representable in the underlying type of the enumeration. In C++11, 10351 // we perform a non-narrowing conversion as part of converted constant 10352 // expression checking. 10353 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10354 if (getLangOpts().MicrosoftMode) { 10355 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 10356 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10357 } else 10358 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 10359 } else 10360 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10361 } else if (getLangOpts().CPlusPlus) { 10362 // C++11 [dcl.enum]p5: 10363 // If the underlying type is not fixed, the type of each enumerator 10364 // is the type of its initializing value: 10365 // - If an initializer is specified for an enumerator, the 10366 // initializing value has the same type as the expression. 10367 EltTy = Val->getType(); 10368 } else { 10369 // C99 6.7.2.2p2: 10370 // The expression that defines the value of an enumeration constant 10371 // shall be an integer constant expression that has a value 10372 // representable as an int. 10373 10374 // Complain if the value is not representable in an int. 10375 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 10376 Diag(IdLoc, diag::ext_enum_value_not_int) 10377 << EnumVal.toString(10) << Val->getSourceRange() 10378 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 10379 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 10380 // Force the type of the expression to 'int'. 10381 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 10382 } 10383 EltTy = Val->getType(); 10384 } 10385 } 10386 } 10387 } 10388 10389 if (!Val) { 10390 if (Enum->isDependentType()) 10391 EltTy = Context.DependentTy; 10392 else if (!LastEnumConst) { 10393 // C++0x [dcl.enum]p5: 10394 // If the underlying type is not fixed, the type of each enumerator 10395 // is the type of its initializing value: 10396 // - If no initializer is specified for the first enumerator, the 10397 // initializing value has an unspecified integral type. 10398 // 10399 // GCC uses 'int' for its unspecified integral type, as does 10400 // C99 6.7.2.2p3. 10401 if (Enum->isFixed()) { 10402 EltTy = Enum->getIntegerType(); 10403 } 10404 else { 10405 EltTy = Context.IntTy; 10406 } 10407 } else { 10408 // Assign the last value + 1. 10409 EnumVal = LastEnumConst->getInitVal(); 10410 ++EnumVal; 10411 EltTy = LastEnumConst->getType(); 10412 10413 // Check for overflow on increment. 10414 if (EnumVal < LastEnumConst->getInitVal()) { 10415 // C++0x [dcl.enum]p5: 10416 // If the underlying type is not fixed, the type of each enumerator 10417 // is the type of its initializing value: 10418 // 10419 // - Otherwise the type of the initializing value is the same as 10420 // the type of the initializing value of the preceding enumerator 10421 // unless the incremented value is not representable in that type, 10422 // in which case the type is an unspecified integral type 10423 // sufficient to contain the incremented value. If no such type 10424 // exists, the program is ill-formed. 10425 QualType T = getNextLargerIntegralType(Context, EltTy); 10426 if (T.isNull() || Enum->isFixed()) { 10427 // There is no integral type larger enough to represent this 10428 // value. Complain, then allow the value to wrap around. 10429 EnumVal = LastEnumConst->getInitVal(); 10430 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 10431 ++EnumVal; 10432 if (Enum->isFixed()) 10433 // When the underlying type is fixed, this is ill-formed. 10434 Diag(IdLoc, diag::err_enumerator_wrapped) 10435 << EnumVal.toString(10) 10436 << EltTy; 10437 else 10438 Diag(IdLoc, diag::warn_enumerator_too_large) 10439 << EnumVal.toString(10); 10440 } else { 10441 EltTy = T; 10442 } 10443 10444 // Retrieve the last enumerator's value, extent that type to the 10445 // type that is supposed to be large enough to represent the incremented 10446 // value, then increment. 10447 EnumVal = LastEnumConst->getInitVal(); 10448 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10449 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 10450 ++EnumVal; 10451 10452 // If we're not in C++, diagnose the overflow of enumerator values, 10453 // which in C99 means that the enumerator value is not representable in 10454 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 10455 // permits enumerator values that are representable in some larger 10456 // integral type. 10457 if (!getLangOpts().CPlusPlus && !T.isNull()) 10458 Diag(IdLoc, diag::warn_enum_value_overflow); 10459 } else if (!getLangOpts().CPlusPlus && 10460 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10461 // Enforce C99 6.7.2.2p2 even when we compute the next value. 10462 Diag(IdLoc, diag::ext_enum_value_not_int) 10463 << EnumVal.toString(10) << 1; 10464 } 10465 } 10466 } 10467 10468 if (!EltTy->isDependentType()) { 10469 // Make the enumerator value match the signedness and size of the 10470 // enumerator's type. 10471 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); 10472 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10473 } 10474 10475 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 10476 Val, EnumVal); 10477} 10478 10479 10480Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 10481 SourceLocation IdLoc, IdentifierInfo *Id, 10482 AttributeList *Attr, 10483 SourceLocation EqualLoc, Expr *Val) { 10484 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 10485 EnumConstantDecl *LastEnumConst = 10486 cast_or_null<EnumConstantDecl>(lastEnumConst); 10487 10488 // The scope passed in may not be a decl scope. Zip up the scope tree until 10489 // we find one that is. 10490 S = getNonFieldDeclScope(S); 10491 10492 // Verify that there isn't already something declared with this name in this 10493 // scope. 10494 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 10495 ForRedeclaration); 10496 if (PrevDecl && PrevDecl->isTemplateParameter()) { 10497 // Maybe we will complain about the shadowed template parameter. 10498 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 10499 // Just pretend that we didn't see the previous declaration. 10500 PrevDecl = 0; 10501 } 10502 10503 if (PrevDecl) { 10504 // When in C++, we may get a TagDecl with the same name; in this case the 10505 // enum constant will 'hide' the tag. 10506 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 10507 "Received TagDecl when not in C++!"); 10508 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 10509 if (isa<EnumConstantDecl>(PrevDecl)) 10510 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 10511 else 10512 Diag(IdLoc, diag::err_redefinition) << Id; 10513 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 10514 return 0; 10515 } 10516 } 10517 10518 // C++ [class.mem]p15: 10519 // If T is the name of a class, then each of the following shall have a name 10520 // different from T: 10521 // - every enumerator of every member of class T that is an unscoped 10522 // enumerated type 10523 if (CXXRecordDecl *Record 10524 = dyn_cast<CXXRecordDecl>( 10525 TheEnumDecl->getDeclContext()->getRedeclContext())) 10526 if (!TheEnumDecl->isScoped() && 10527 Record->getIdentifier() && Record->getIdentifier() == Id) 10528 Diag(IdLoc, diag::err_member_name_of_class) << Id; 10529 10530 EnumConstantDecl *New = 10531 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 10532 10533 if (New) { 10534 // Process attributes. 10535 if (Attr) ProcessDeclAttributeList(S, New, Attr); 10536 10537 // Register this decl in the current scope stack. 10538 New->setAccess(TheEnumDecl->getAccess()); 10539 PushOnScopeChains(New, S); 10540 } 10541 10542 ActOnDocumentableDecl(New); 10543 10544 return New; 10545} 10546 10547void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 10548 SourceLocation RBraceLoc, Decl *EnumDeclX, 10549 Decl **Elements, unsigned NumElements, 10550 Scope *S, AttributeList *Attr) { 10551 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 10552 QualType EnumType = Context.getTypeDeclType(Enum); 10553 10554 if (Attr) 10555 ProcessDeclAttributeList(S, Enum, Attr); 10556 10557 if (Enum->isDependentType()) { 10558 for (unsigned i = 0; i != NumElements; ++i) { 10559 EnumConstantDecl *ECD = 10560 cast_or_null<EnumConstantDecl>(Elements[i]); 10561 if (!ECD) continue; 10562 10563 ECD->setType(EnumType); 10564 } 10565 10566 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 10567 return; 10568 } 10569 10570 // TODO: If the result value doesn't fit in an int, it must be a long or long 10571 // long value. ISO C does not support this, but GCC does as an extension, 10572 // emit a warning. 10573 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10574 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 10575 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 10576 10577 // Verify that all the values are okay, compute the size of the values, and 10578 // reverse the list. 10579 unsigned NumNegativeBits = 0; 10580 unsigned NumPositiveBits = 0; 10581 10582 // Keep track of whether all elements have type int. 10583 bool AllElementsInt = true; 10584 10585 for (unsigned i = 0; i != NumElements; ++i) { 10586 EnumConstantDecl *ECD = 10587 cast_or_null<EnumConstantDecl>(Elements[i]); 10588 if (!ECD) continue; // Already issued a diagnostic. 10589 10590 const llvm::APSInt &InitVal = ECD->getInitVal(); 10591 10592 // Keep track of the size of positive and negative values. 10593 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 10594 NumPositiveBits = std::max(NumPositiveBits, 10595 (unsigned)InitVal.getActiveBits()); 10596 else 10597 NumNegativeBits = std::max(NumNegativeBits, 10598 (unsigned)InitVal.getMinSignedBits()); 10599 10600 // Keep track of whether every enum element has type int (very commmon). 10601 if (AllElementsInt) 10602 AllElementsInt = ECD->getType() == Context.IntTy; 10603 } 10604 10605 // Figure out the type that should be used for this enum. 10606 QualType BestType; 10607 unsigned BestWidth; 10608 10609 // C++0x N3000 [conv.prom]p3: 10610 // An rvalue of an unscoped enumeration type whose underlying 10611 // type is not fixed can be converted to an rvalue of the first 10612 // of the following types that can represent all the values of 10613 // the enumeration: int, unsigned int, long int, unsigned long 10614 // int, long long int, or unsigned long long int. 10615 // C99 6.4.4.3p2: 10616 // An identifier declared as an enumeration constant has type int. 10617 // The C99 rule is modified by a gcc extension 10618 QualType BestPromotionType; 10619 10620 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 10621 // -fshort-enums is the equivalent to specifying the packed attribute on all 10622 // enum definitions. 10623 if (LangOpts.ShortEnums) 10624 Packed = true; 10625 10626 if (Enum->isFixed()) { 10627 BestType = Enum->getIntegerType(); 10628 if (BestType->isPromotableIntegerType()) 10629 BestPromotionType = Context.getPromotedIntegerType(BestType); 10630 else 10631 BestPromotionType = BestType; 10632 // We don't need to set BestWidth, because BestType is going to be the type 10633 // of the enumerators, but we do anyway because otherwise some compilers 10634 // warn that it might be used uninitialized. 10635 BestWidth = CharWidth; 10636 } 10637 else if (NumNegativeBits) { 10638 // If there is a negative value, figure out the smallest integer type (of 10639 // int/long/longlong) that fits. 10640 // If it's packed, check also if it fits a char or a short. 10641 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 10642 BestType = Context.SignedCharTy; 10643 BestWidth = CharWidth; 10644 } else if (Packed && NumNegativeBits <= ShortWidth && 10645 NumPositiveBits < ShortWidth) { 10646 BestType = Context.ShortTy; 10647 BestWidth = ShortWidth; 10648 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 10649 BestType = Context.IntTy; 10650 BestWidth = IntWidth; 10651 } else { 10652 BestWidth = Context.getTargetInfo().getLongWidth(); 10653 10654 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 10655 BestType = Context.LongTy; 10656 } else { 10657 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10658 10659 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 10660 Diag(Enum->getLocation(), diag::warn_enum_too_large); 10661 BestType = Context.LongLongTy; 10662 } 10663 } 10664 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 10665 } else { 10666 // If there is no negative value, figure out the smallest type that fits 10667 // all of the enumerator values. 10668 // If it's packed, check also if it fits a char or a short. 10669 if (Packed && NumPositiveBits <= CharWidth) { 10670 BestType = Context.UnsignedCharTy; 10671 BestPromotionType = Context.IntTy; 10672 BestWidth = CharWidth; 10673 } else if (Packed && NumPositiveBits <= ShortWidth) { 10674 BestType = Context.UnsignedShortTy; 10675 BestPromotionType = Context.IntTy; 10676 BestWidth = ShortWidth; 10677 } else if (NumPositiveBits <= IntWidth) { 10678 BestType = Context.UnsignedIntTy; 10679 BestWidth = IntWidth; 10680 BestPromotionType 10681 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10682 ? Context.UnsignedIntTy : Context.IntTy; 10683 } else if (NumPositiveBits <= 10684 (BestWidth = Context.getTargetInfo().getLongWidth())) { 10685 BestType = Context.UnsignedLongTy; 10686 BestPromotionType 10687 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10688 ? Context.UnsignedLongTy : Context.LongTy; 10689 } else { 10690 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10691 assert(NumPositiveBits <= BestWidth && 10692 "How could an initializer get larger than ULL?"); 10693 BestType = Context.UnsignedLongLongTy; 10694 BestPromotionType 10695 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10696 ? Context.UnsignedLongLongTy : Context.LongLongTy; 10697 } 10698 } 10699 10700 // Loop over all of the enumerator constants, changing their types to match 10701 // the type of the enum if needed. 10702 for (unsigned i = 0; i != NumElements; ++i) { 10703 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10704 if (!ECD) continue; // Already issued a diagnostic. 10705 10706 // Standard C says the enumerators have int type, but we allow, as an 10707 // extension, the enumerators to be larger than int size. If each 10708 // enumerator value fits in an int, type it as an int, otherwise type it the 10709 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 10710 // that X has type 'int', not 'unsigned'. 10711 10712 // Determine whether the value fits into an int. 10713 llvm::APSInt InitVal = ECD->getInitVal(); 10714 10715 // If it fits into an integer type, force it. Otherwise force it to match 10716 // the enum decl type. 10717 QualType NewTy; 10718 unsigned NewWidth; 10719 bool NewSign; 10720 if (!getLangOpts().CPlusPlus && 10721 !Enum->isFixed() && 10722 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 10723 NewTy = Context.IntTy; 10724 NewWidth = IntWidth; 10725 NewSign = true; 10726 } else if (ECD->getType() == BestType) { 10727 // Already the right type! 10728 if (getLangOpts().CPlusPlus) 10729 // C++ [dcl.enum]p4: Following the closing brace of an 10730 // enum-specifier, each enumerator has the type of its 10731 // enumeration. 10732 ECD->setType(EnumType); 10733 continue; 10734 } else { 10735 NewTy = BestType; 10736 NewWidth = BestWidth; 10737 NewSign = BestType->isSignedIntegerOrEnumerationType(); 10738 } 10739 10740 // Adjust the APSInt value. 10741 InitVal = InitVal.extOrTrunc(NewWidth); 10742 InitVal.setIsSigned(NewSign); 10743 ECD->setInitVal(InitVal); 10744 10745 // Adjust the Expr initializer and type. 10746 if (ECD->getInitExpr() && 10747 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10748 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10749 CK_IntegralCast, 10750 ECD->getInitExpr(), 10751 /*base paths*/ 0, 10752 VK_RValue)); 10753 if (getLangOpts().CPlusPlus) 10754 // C++ [dcl.enum]p4: Following the closing brace of an 10755 // enum-specifier, each enumerator has the type of its 10756 // enumeration. 10757 ECD->setType(EnumType); 10758 else 10759 ECD->setType(NewTy); 10760 } 10761 10762 Enum->completeDefinition(BestType, BestPromotionType, 10763 NumPositiveBits, NumNegativeBits); 10764 10765 // If we're declaring a function, ensure this decl isn't forgotten about - 10766 // it needs to go into the function scope. 10767 if (InFunctionDeclarator) 10768 DeclsInPrototypeScope.push_back(Enum); 10769} 10770 10771Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10772 SourceLocation StartLoc, 10773 SourceLocation EndLoc) { 10774 StringLiteral *AsmString = cast<StringLiteral>(expr); 10775 10776 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10777 AsmString, StartLoc, 10778 EndLoc); 10779 CurContext->addDecl(New); 10780 return New; 10781} 10782 10783DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10784 SourceLocation ImportLoc, 10785 ModuleIdPath Path) { 10786 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10787 Module::AllVisible, 10788 /*IsIncludeDirective=*/false); 10789 if (!Mod) 10790 return true; 10791 10792 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10793 Module *ModCheck = Mod; 10794 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10795 // If we've run out of module parents, just drop the remaining identifiers. 10796 // We need the length to be consistent. 10797 if (!ModCheck) 10798 break; 10799 ModCheck = ModCheck->Parent; 10800 10801 IdentifierLocs.push_back(Path[I].second); 10802 } 10803 10804 ImportDecl *Import = ImportDecl::Create(Context, 10805 Context.getTranslationUnitDecl(), 10806 AtLoc.isValid()? AtLoc : ImportLoc, 10807 Mod, IdentifierLocs); 10808 Context.getTranslationUnitDecl()->addDecl(Import); 10809 return Import; 10810} 10811 10812void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name, 10813 IdentifierInfo* AliasName, 10814 SourceLocation PragmaLoc, 10815 SourceLocation NameLoc, 10816 SourceLocation AliasNameLoc) { 10817 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, 10818 LookupOrdinaryName); 10819 AsmLabelAttr *Attr = 10820 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName()); 10821 10822 if (PrevDecl) 10823 PrevDecl->addAttr(Attr); 10824 else 10825 (void)ExtnameUndeclaredIdentifiers.insert( 10826 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr)); 10827} 10828 10829void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10830 SourceLocation PragmaLoc, 10831 SourceLocation NameLoc) { 10832 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10833 10834 if (PrevDecl) { 10835 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10836 } else { 10837 (void)WeakUndeclaredIdentifiers.insert( 10838 std::pair<IdentifierInfo*,WeakInfo> 10839 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10840 } 10841} 10842 10843void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10844 IdentifierInfo* AliasName, 10845 SourceLocation PragmaLoc, 10846 SourceLocation NameLoc, 10847 SourceLocation AliasNameLoc) { 10848 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10849 LookupOrdinaryName); 10850 WeakInfo W = WeakInfo(Name, NameLoc); 10851 10852 if (PrevDecl) { 10853 if (!PrevDecl->hasAttr<AliasAttr>()) 10854 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10855 DeclApplyPragmaWeak(TUScope, ND, W); 10856 } else { 10857 (void)WeakUndeclaredIdentifiers.insert( 10858 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10859 } 10860} 10861 10862Decl *Sema::getObjCDeclContext() const { 10863 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10864} 10865 10866AvailabilityResult Sema::getCurContextAvailability() const { 10867 const Decl *D = cast<Decl>(getCurObjCLexicalContext()); 10868 return D->getAvailability(); 10869} 10870