SemaDecl.cpp revision c0c00664887f5d99780c9b3e33e2f204712823b7
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_class). This is used to diagnose cases in C 354/// 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_Union: return DeclSpec::TST_union; 365 case TTK_Class: return DeclSpec::TST_class; 366 case TTK_Enum: return DeclSpec::TST_enum; 367 } 368 } 369 370 return DeclSpec::TST_unspecified; 371} 372 373/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 374/// if a CXXScopeSpec's type is equal to the type of one of the base classes 375/// then downgrade the missing typename error to a warning. 376/// This is needed for MSVC compatibility; Example: 377/// @code 378/// template<class T> class A { 379/// public: 380/// typedef int TYPE; 381/// }; 382/// template<class T> class B : public A<T> { 383/// public: 384/// A<T>::TYPE a; // no typename required because A<T> is a base class. 385/// }; 386/// @endcode 387bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 388 if (CurContext->isRecord()) { 389 const Type *Ty = SS->getScopeRep()->getAsType(); 390 391 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 392 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 393 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 394 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 395 return true; 396 return S->isFunctionPrototypeScope(); 397 } 398 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 399} 400 401bool Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II, 402 SourceLocation IILoc, 403 Scope *S, 404 CXXScopeSpec *SS, 405 ParsedType &SuggestedType) { 406 // We don't have anything to suggest (yet). 407 SuggestedType = ParsedType(); 408 409 // There may have been a typo in the name of the type. Look up typo 410 // results, in case we have something that we can suggest. 411 TypeNameValidatorCCC Validator(false); 412 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(II, IILoc), 413 LookupOrdinaryName, S, SS, 414 Validator)) { 415 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 416 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 417 418 if (Corrected.isKeyword()) { 419 // We corrected to a keyword. 420 IdentifierInfo *NewII = Corrected.getCorrectionAsIdentifierInfo(); 421 if (!isSimpleTypeSpecifier(NewII->getTokenID())) 422 CorrectedQuotedStr = "the keyword " + CorrectedQuotedStr; 423 Diag(IILoc, diag::err_unknown_typename_suggest) 424 << II << CorrectedQuotedStr 425 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 426 II = NewII; 427 } else { 428 NamedDecl *Result = Corrected.getCorrectionDecl(); 429 // We found a similarly-named type or interface; suggest that. 430 if (!SS || !SS->isSet()) 431 Diag(IILoc, diag::err_unknown_typename_suggest) 432 << II << CorrectedQuotedStr 433 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 434 else if (DeclContext *DC = computeDeclContext(*SS, false)) 435 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 436 << II << DC << CorrectedQuotedStr << SS->getRange() 437 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 438 else 439 llvm_unreachable("could not have corrected a typo here"); 440 441 Diag(Result->getLocation(), diag::note_previous_decl) 442 << CorrectedQuotedStr; 443 444 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 445 false, false, ParsedType(), 446 /*IsCtorOrDtorName=*/false, 447 /*NonTrivialTypeSourceInfo=*/true); 448 } 449 return true; 450 } 451 452 if (getLangOpts().CPlusPlus) { 453 // See if II is a class template that the user forgot to pass arguments to. 454 UnqualifiedId Name; 455 Name.setIdentifier(II, IILoc); 456 CXXScopeSpec EmptySS; 457 TemplateTy TemplateResult; 458 bool MemberOfUnknownSpecialization; 459 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 460 Name, ParsedType(), true, TemplateResult, 461 MemberOfUnknownSpecialization) == TNK_Type_template) { 462 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 463 Diag(IILoc, diag::err_template_missing_args) << TplName; 464 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 465 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 466 << TplDecl->getTemplateParameters()->getSourceRange(); 467 } 468 return true; 469 } 470 } 471 472 // FIXME: Should we move the logic that tries to recover from a missing tag 473 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 474 475 if (!SS || (!SS->isSet() && !SS->isInvalid())) 476 Diag(IILoc, diag::err_unknown_typename) << II; 477 else if (DeclContext *DC = computeDeclContext(*SS, false)) 478 Diag(IILoc, diag::err_typename_nested_not_found) 479 << II << DC << SS->getRange(); 480 else if (isDependentScopeSpecifier(*SS)) { 481 unsigned DiagID = diag::err_typename_missing; 482 if (getLangOpts().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 483 DiagID = diag::warn_typename_missing; 484 485 Diag(SS->getRange().getBegin(), DiagID) 486 << (NestedNameSpecifier *)SS->getScopeRep() << II->getName() 487 << SourceRange(SS->getRange().getBegin(), IILoc) 488 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 489 SuggestedType = ActOnTypenameType(S, SourceLocation(), 490 *SS, *II, IILoc).get(); 491 } else { 492 assert(SS && SS->isInvalid() && 493 "Invalid scope specifier has already been diagnosed"); 494 } 495 496 return true; 497} 498 499/// \brief Determine whether the given result set contains either a type name 500/// or 501static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 502 bool CheckTemplate = R.getSema().getLangOpts().CPlusPlus && 503 NextToken.is(tok::less); 504 505 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 506 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 507 return true; 508 509 if (CheckTemplate && isa<TemplateDecl>(*I)) 510 return true; 511 } 512 513 return false; 514} 515 516static bool isTagTypeWithMissingTag(Sema &SemaRef, LookupResult &Result, 517 Scope *S, CXXScopeSpec &SS, 518 IdentifierInfo *&Name, 519 SourceLocation NameLoc) { 520 Result.clear(Sema::LookupTagName); 521 SemaRef.LookupParsedName(Result, S, &SS); 522 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 523 const char *TagName = 0; 524 const char *FixItTagName = 0; 525 switch (Tag->getTagKind()) { 526 case TTK_Class: 527 TagName = "class"; 528 FixItTagName = "class "; 529 break; 530 531 case TTK_Enum: 532 TagName = "enum"; 533 FixItTagName = "enum "; 534 break; 535 536 case TTK_Struct: 537 TagName = "struct"; 538 FixItTagName = "struct "; 539 break; 540 541 case TTK_Union: 542 TagName = "union"; 543 FixItTagName = "union "; 544 break; 545 } 546 547 SemaRef.Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 548 << Name << TagName << SemaRef.getLangOpts().CPlusPlus 549 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 550 551 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupOrdinaryName); 552 if (SemaRef.LookupParsedName(R, S, &SS)) { 553 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); 554 I != IEnd; ++I) 555 SemaRef.Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type) 556 << Name << TagName; 557 } 558 return true; 559 } 560 561 Result.clear(Sema::LookupOrdinaryName); 562 return false; 563} 564 565/// Build a ParsedType for a simple-type-specifier with a nested-name-specifier. 566static ParsedType buildNestedType(Sema &S, CXXScopeSpec &SS, 567 QualType T, SourceLocation NameLoc) { 568 ASTContext &Context = S.Context; 569 570 TypeLocBuilder Builder; 571 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 572 573 T = S.getElaboratedType(ETK_None, SS, T); 574 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 575 ElabTL.setElaboratedKeywordLoc(SourceLocation()); 576 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context)); 577 return S.CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 578} 579 580Sema::NameClassification Sema::ClassifyName(Scope *S, 581 CXXScopeSpec &SS, 582 IdentifierInfo *&Name, 583 SourceLocation NameLoc, 584 const Token &NextToken, 585 bool IsAddressOfOperand, 586 CorrectionCandidateCallback *CCC) { 587 DeclarationNameInfo NameInfo(Name, NameLoc); 588 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 589 590 if (NextToken.is(tok::coloncolon)) { 591 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 592 QualType(), false, SS, 0, false); 593 594 } 595 596 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 597 LookupParsedName(Result, S, &SS, !CurMethod); 598 599 // Perform lookup for Objective-C instance variables (including automatically 600 // synthesized instance variables), if we're in an Objective-C method. 601 // FIXME: This lookup really, really needs to be folded in to the normal 602 // unqualified lookup mechanism. 603 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 604 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 605 if (E.get() || E.isInvalid()) 606 return E; 607 } 608 609 bool SecondTry = false; 610 bool IsFilteredTemplateName = false; 611 612Corrected: 613 switch (Result.getResultKind()) { 614 case LookupResult::NotFound: 615 // If an unqualified-id is followed by a '(', then we have a function 616 // call. 617 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 618 // In C++, this is an ADL-only call. 619 // FIXME: Reference? 620 if (getLangOpts().CPlusPlus) 621 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 622 623 // C90 6.3.2.2: 624 // If the expression that precedes the parenthesized argument list in a 625 // function call consists solely of an identifier, and if no 626 // declaration is visible for this identifier, the identifier is 627 // implicitly declared exactly as if, in the innermost block containing 628 // the function call, the declaration 629 // 630 // extern int identifier (); 631 // 632 // appeared. 633 // 634 // We also allow this in C99 as an extension. 635 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 636 Result.addDecl(D); 637 Result.resolveKind(); 638 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 639 } 640 } 641 642 // In C, we first see whether there is a tag type by the same name, in 643 // which case it's likely that the user just forget to write "enum", 644 // "struct", or "union". 645 if (!getLangOpts().CPlusPlus && !SecondTry && 646 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) { 647 break; 648 } 649 650 // Perform typo correction to determine if there is another name that is 651 // close to this name. 652 if (!SecondTry && CCC) { 653 SecondTry = true; 654 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 655 Result.getLookupKind(), S, 656 &SS, *CCC)) { 657 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 658 unsigned QualifiedDiag = diag::err_no_member_suggest; 659 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 660 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 661 662 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 663 NamedDecl *UnderlyingFirstDecl 664 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 665 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 666 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 667 UnqualifiedDiag = diag::err_no_template_suggest; 668 QualifiedDiag = diag::err_no_member_template_suggest; 669 } else if (UnderlyingFirstDecl && 670 (isa<TypeDecl>(UnderlyingFirstDecl) || 671 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 672 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 673 UnqualifiedDiag = diag::err_unknown_typename_suggest; 674 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 675 } 676 677 if (SS.isEmpty()) 678 Diag(NameLoc, UnqualifiedDiag) 679 << Name << CorrectedQuotedStr 680 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 681 else 682 Diag(NameLoc, QualifiedDiag) 683 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 684 << SS.getRange() 685 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 686 687 // Update the name, so that the caller has the new name. 688 Name = Corrected.getCorrectionAsIdentifierInfo(); 689 690 // Typo correction corrected to a keyword. 691 if (Corrected.isKeyword()) 692 return Corrected.getCorrectionAsIdentifierInfo(); 693 694 // Also update the LookupResult... 695 // FIXME: This should probably go away at some point 696 Result.clear(); 697 Result.setLookupName(Corrected.getCorrection()); 698 if (FirstDecl) { 699 Result.addDecl(FirstDecl); 700 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 701 << CorrectedQuotedStr; 702 } 703 704 // If we found an Objective-C instance variable, let 705 // LookupInObjCMethod build the appropriate expression to 706 // reference the ivar. 707 // FIXME: This is a gross hack. 708 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 709 Result.clear(); 710 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 711 return E; 712 } 713 714 goto Corrected; 715 } 716 } 717 718 // We failed to correct; just fall through and let the parser deal with it. 719 Result.suppressDiagnostics(); 720 return NameClassification::Unknown(); 721 722 case LookupResult::NotFoundInCurrentInstantiation: { 723 // We performed name lookup into the current instantiation, and there were 724 // dependent bases, so we treat this result the same way as any other 725 // dependent nested-name-specifier. 726 727 // C++ [temp.res]p2: 728 // A name used in a template declaration or definition and that is 729 // dependent on a template-parameter is assumed not to name a type 730 // unless the applicable name lookup finds a type name or the name is 731 // qualified by the keyword typename. 732 // 733 // FIXME: If the next token is '<', we might want to ask the parser to 734 // perform some heroics to see if we actually have a 735 // template-argument-list, which would indicate a missing 'template' 736 // keyword here. 737 return ActOnDependentIdExpression(SS, /*TemplateKWLoc=*/SourceLocation(), 738 NameInfo, IsAddressOfOperand, 739 /*TemplateArgs=*/0); 740 } 741 742 case LookupResult::Found: 743 case LookupResult::FoundOverloaded: 744 case LookupResult::FoundUnresolvedValue: 745 break; 746 747 case LookupResult::Ambiguous: 748 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 749 hasAnyAcceptableTemplateNames(Result)) { 750 // C++ [temp.local]p3: 751 // A lookup that finds an injected-class-name (10.2) can result in an 752 // ambiguity in certain cases (for example, if it is found in more than 753 // one base class). If all of the injected-class-names that are found 754 // refer to specializations of the same class template, and if the name 755 // is followed by a template-argument-list, the reference refers to the 756 // class template itself and not a specialization thereof, and is not 757 // ambiguous. 758 // 759 // This filtering can make an ambiguous result into an unambiguous one, 760 // so try again after filtering out template names. 761 FilterAcceptableTemplateNames(Result); 762 if (!Result.isAmbiguous()) { 763 IsFilteredTemplateName = true; 764 break; 765 } 766 } 767 768 // Diagnose the ambiguity and return an error. 769 return NameClassification::Error(); 770 } 771 772 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 773 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 774 // C++ [temp.names]p3: 775 // After name lookup (3.4) finds that a name is a template-name or that 776 // an operator-function-id or a literal- operator-id refers to a set of 777 // overloaded functions any member of which is a function template if 778 // this is followed by a <, the < is always taken as the delimiter of a 779 // template-argument-list and never as the less-than operator. 780 if (!IsFilteredTemplateName) 781 FilterAcceptableTemplateNames(Result); 782 783 if (!Result.empty()) { 784 bool IsFunctionTemplate; 785 TemplateName Template; 786 if (Result.end() - Result.begin() > 1) { 787 IsFunctionTemplate = true; 788 Template = Context.getOverloadedTemplateName(Result.begin(), 789 Result.end()); 790 } else { 791 TemplateDecl *TD 792 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 793 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 794 795 if (SS.isSet() && !SS.isInvalid()) 796 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 797 /*TemplateKeyword=*/false, 798 TD); 799 else 800 Template = TemplateName(TD); 801 } 802 803 if (IsFunctionTemplate) { 804 // Function templates always go through overload resolution, at which 805 // point we'll perform the various checks (e.g., accessibility) we need 806 // to based on which function we selected. 807 Result.suppressDiagnostics(); 808 809 return NameClassification::FunctionTemplate(Template); 810 } 811 812 return NameClassification::TypeTemplate(Template); 813 } 814 } 815 816 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 817 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 818 DiagnoseUseOfDecl(Type, NameLoc); 819 QualType T = Context.getTypeDeclType(Type); 820 if (SS.isNotEmpty()) 821 return buildNestedType(*this, SS, T, NameLoc); 822 return ParsedType::make(T); 823 } 824 825 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 826 if (!Class) { 827 // FIXME: It's unfortunate that we don't have a Type node for handling this. 828 if (ObjCCompatibleAliasDecl *Alias 829 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 830 Class = Alias->getClassInterface(); 831 } 832 833 if (Class) { 834 DiagnoseUseOfDecl(Class, NameLoc); 835 836 if (NextToken.is(tok::period)) { 837 // Interface. <something> is parsed as a property reference expression. 838 // Just return "unknown" as a fall-through for now. 839 Result.suppressDiagnostics(); 840 return NameClassification::Unknown(); 841 } 842 843 QualType T = Context.getObjCInterfaceType(Class); 844 return ParsedType::make(T); 845 } 846 847 // We can have a type template here if we're classifying a template argument. 848 if (isa<TemplateDecl>(FirstDecl) && !isa<FunctionTemplateDecl>(FirstDecl)) 849 return NameClassification::TypeTemplate( 850 TemplateName(cast<TemplateDecl>(FirstDecl))); 851 852 // Check for a tag type hidden by a non-type decl in a few cases where it 853 // seems likely a type is wanted instead of the non-type that was found. 854 if (!getLangOpts().ObjC1) { 855 bool NextIsOp = NextToken.is(tok::amp) || NextToken.is(tok::star); 856 if ((NextToken.is(tok::identifier) || 857 (NextIsOp && FirstDecl->isFunctionOrFunctionTemplate())) && 858 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) { 859 FirstDecl = (*Result.begin())->getUnderlyingDecl(); 860 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 861 DiagnoseUseOfDecl(Type, NameLoc); 862 QualType T = Context.getTypeDeclType(Type); 863 if (SS.isNotEmpty()) 864 return buildNestedType(*this, SS, T, NameLoc); 865 return ParsedType::make(T); 866 } 867 } 868 } 869 870 if (FirstDecl->isCXXClassMember()) 871 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0); 872 873 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 874 return BuildDeclarationNameExpr(SS, Result, ADL); 875} 876 877// Determines the context to return to after temporarily entering a 878// context. This depends in an unnecessarily complicated way on the 879// exact ordering of callbacks from the parser. 880DeclContext *Sema::getContainingDC(DeclContext *DC) { 881 882 // Functions defined inline within classes aren't parsed until we've 883 // finished parsing the top-level class, so the top-level class is 884 // the context we'll need to return to. 885 if (isa<FunctionDecl>(DC)) { 886 DC = DC->getLexicalParent(); 887 888 // A function not defined within a class will always return to its 889 // lexical context. 890 if (!isa<CXXRecordDecl>(DC)) 891 return DC; 892 893 // A C++ inline method/friend is parsed *after* the topmost class 894 // it was declared in is fully parsed ("complete"); the topmost 895 // class is the context we need to return to. 896 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 897 DC = RD; 898 899 // Return the declaration context of the topmost class the inline method is 900 // declared in. 901 return DC; 902 } 903 904 return DC->getLexicalParent(); 905} 906 907void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 908 assert(getContainingDC(DC) == CurContext && 909 "The next DeclContext should be lexically contained in the current one."); 910 CurContext = DC; 911 S->setEntity(DC); 912} 913 914void Sema::PopDeclContext() { 915 assert(CurContext && "DeclContext imbalance!"); 916 917 CurContext = getContainingDC(CurContext); 918 assert(CurContext && "Popped translation unit!"); 919} 920 921/// EnterDeclaratorContext - Used when we must lookup names in the context 922/// of a declarator's nested name specifier. 923/// 924void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 925 // C++0x [basic.lookup.unqual]p13: 926 // A name used in the definition of a static data member of class 927 // X (after the qualified-id of the static member) is looked up as 928 // if the name was used in a member function of X. 929 // C++0x [basic.lookup.unqual]p14: 930 // If a variable member of a namespace is defined outside of the 931 // scope of its namespace then any name used in the definition of 932 // the variable member (after the declarator-id) is looked up as 933 // if the definition of the variable member occurred in its 934 // namespace. 935 // Both of these imply that we should push a scope whose context 936 // is the semantic context of the declaration. We can't use 937 // PushDeclContext here because that context is not necessarily 938 // lexically contained in the current context. Fortunately, 939 // the containing scope should have the appropriate information. 940 941 assert(!S->getEntity() && "scope already has entity"); 942 943#ifndef NDEBUG 944 Scope *Ancestor = S->getParent(); 945 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 946 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 947#endif 948 949 CurContext = DC; 950 S->setEntity(DC); 951} 952 953void Sema::ExitDeclaratorContext(Scope *S) { 954 assert(S->getEntity() == CurContext && "Context imbalance!"); 955 956 // Switch back to the lexical context. The safety of this is 957 // enforced by an assert in EnterDeclaratorContext. 958 Scope *Ancestor = S->getParent(); 959 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 960 CurContext = (DeclContext*) Ancestor->getEntity(); 961 962 // We don't need to do anything with the scope, which is going to 963 // disappear. 964} 965 966 967void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 968 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 969 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 970 // We assume that the caller has already called 971 // ActOnReenterTemplateScope 972 FD = TFD->getTemplatedDecl(); 973 } 974 if (!FD) 975 return; 976 977 // Same implementation as PushDeclContext, but enters the context 978 // from the lexical parent, rather than the top-level class. 979 assert(CurContext == FD->getLexicalParent() && 980 "The next DeclContext should be lexically contained in the current one."); 981 CurContext = FD; 982 S->setEntity(CurContext); 983 984 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 985 ParmVarDecl *Param = FD->getParamDecl(P); 986 // If the parameter has an identifier, then add it to the scope 987 if (Param->getIdentifier()) { 988 S->AddDecl(Param); 989 IdResolver.AddDecl(Param); 990 } 991 } 992} 993 994 995void Sema::ActOnExitFunctionContext() { 996 // Same implementation as PopDeclContext, but returns to the lexical parent, 997 // rather than the top-level class. 998 assert(CurContext && "DeclContext imbalance!"); 999 CurContext = CurContext->getLexicalParent(); 1000 assert(CurContext && "Popped translation unit!"); 1001} 1002 1003 1004/// \brief Determine whether we allow overloading of the function 1005/// PrevDecl with another declaration. 1006/// 1007/// This routine determines whether overloading is possible, not 1008/// whether some new function is actually an overload. It will return 1009/// true in C++ (where we can always provide overloads) or, as an 1010/// extension, in C when the previous function is already an 1011/// overloaded function declaration or has the "overloadable" 1012/// attribute. 1013static bool AllowOverloadingOfFunction(LookupResult &Previous, 1014 ASTContext &Context) { 1015 if (Context.getLangOpts().CPlusPlus) 1016 return true; 1017 1018 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 1019 return true; 1020 1021 return (Previous.getResultKind() == LookupResult::Found 1022 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 1023} 1024 1025/// Add this decl to the scope shadowed decl chains. 1026void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 1027 // Move up the scope chain until we find the nearest enclosing 1028 // non-transparent context. The declaration will be introduced into this 1029 // scope. 1030 while (S->getEntity() && 1031 ((DeclContext *)S->getEntity())->isTransparentContext()) 1032 S = S->getParent(); 1033 1034 // Add scoped declarations into their context, so that they can be 1035 // found later. Declarations without a context won't be inserted 1036 // into any context. 1037 if (AddToContext) 1038 CurContext->addDecl(D); 1039 1040 // Out-of-line definitions shouldn't be pushed into scope in C++. 1041 // Out-of-line variable and function definitions shouldn't even in C. 1042 if ((getLangOpts().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 1043 D->isOutOfLine() && 1044 !D->getDeclContext()->getRedeclContext()->Equals( 1045 D->getLexicalDeclContext()->getRedeclContext())) 1046 return; 1047 1048 // Template instantiations should also not be pushed into scope. 1049 if (isa<FunctionDecl>(D) && 1050 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 1051 return; 1052 1053 // If this replaces anything in the current scope, 1054 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 1055 IEnd = IdResolver.end(); 1056 for (; I != IEnd; ++I) { 1057 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 1058 S->RemoveDecl(*I); 1059 IdResolver.RemoveDecl(*I); 1060 1061 // Should only need to replace one decl. 1062 break; 1063 } 1064 } 1065 1066 S->AddDecl(D); 1067 1068 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 1069 // Implicitly-generated labels may end up getting generated in an order that 1070 // isn't strictly lexical, which breaks name lookup. Be careful to insert 1071 // the label at the appropriate place in the identifier chain. 1072 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 1073 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 1074 if (IDC == CurContext) { 1075 if (!S->isDeclScope(*I)) 1076 continue; 1077 } else if (IDC->Encloses(CurContext)) 1078 break; 1079 } 1080 1081 IdResolver.InsertDeclAfter(I, D); 1082 } else { 1083 IdResolver.AddDecl(D); 1084 } 1085} 1086 1087void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 1088 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 1089 TUScope->AddDecl(D); 1090} 1091 1092bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 1093 bool ExplicitInstantiationOrSpecialization) { 1094 return IdResolver.isDeclInScope(D, Ctx, Context, S, 1095 ExplicitInstantiationOrSpecialization); 1096} 1097 1098Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 1099 DeclContext *TargetDC = DC->getPrimaryContext(); 1100 do { 1101 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 1102 if (ScopeDC->getPrimaryContext() == TargetDC) 1103 return S; 1104 } while ((S = S->getParent())); 1105 1106 return 0; 1107} 1108 1109static bool isOutOfScopePreviousDeclaration(NamedDecl *, 1110 DeclContext*, 1111 ASTContext&); 1112 1113/// Filters out lookup results that don't fall within the given scope 1114/// as determined by isDeclInScope. 1115void Sema::FilterLookupForScope(LookupResult &R, 1116 DeclContext *Ctx, Scope *S, 1117 bool ConsiderLinkage, 1118 bool ExplicitInstantiationOrSpecialization) { 1119 LookupResult::Filter F = R.makeFilter(); 1120 while (F.hasNext()) { 1121 NamedDecl *D = F.next(); 1122 1123 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 1124 continue; 1125 1126 if (ConsiderLinkage && 1127 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 1128 continue; 1129 1130 F.erase(); 1131 } 1132 1133 F.done(); 1134} 1135 1136static bool isUsingDecl(NamedDecl *D) { 1137 return isa<UsingShadowDecl>(D) || 1138 isa<UnresolvedUsingTypenameDecl>(D) || 1139 isa<UnresolvedUsingValueDecl>(D); 1140} 1141 1142/// Removes using shadow declarations from the lookup results. 1143static void RemoveUsingDecls(LookupResult &R) { 1144 LookupResult::Filter F = R.makeFilter(); 1145 while (F.hasNext()) 1146 if (isUsingDecl(F.next())) 1147 F.erase(); 1148 1149 F.done(); 1150} 1151 1152/// \brief Check for this common pattern: 1153/// @code 1154/// class S { 1155/// S(const S&); // DO NOT IMPLEMENT 1156/// void operator=(const S&); // DO NOT IMPLEMENT 1157/// }; 1158/// @endcode 1159static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1160 // FIXME: Should check for private access too but access is set after we get 1161 // the decl here. 1162 if (D->doesThisDeclarationHaveABody()) 1163 return false; 1164 1165 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1166 return CD->isCopyConstructor(); 1167 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1168 return Method->isCopyAssignmentOperator(); 1169 return false; 1170} 1171 1172bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1173 assert(D); 1174 1175 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1176 return false; 1177 1178 // Ignore class templates. 1179 if (D->getDeclContext()->isDependentContext() || 1180 D->getLexicalDeclContext()->isDependentContext()) 1181 return false; 1182 1183 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1184 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1185 return false; 1186 1187 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1188 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1189 return false; 1190 } else { 1191 // 'static inline' functions are used in headers; don't warn. 1192 if (FD->getStorageClass() == SC_Static && 1193 FD->isInlineSpecified()) 1194 return false; 1195 } 1196 1197 if (FD->doesThisDeclarationHaveABody() && 1198 Context.DeclMustBeEmitted(FD)) 1199 return false; 1200 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1201 if (!VD->isFileVarDecl() || 1202 VD->getType().isConstant(Context) || 1203 Context.DeclMustBeEmitted(VD)) 1204 return false; 1205 1206 if (VD->isStaticDataMember() && 1207 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1208 return false; 1209 1210 } else { 1211 return false; 1212 } 1213 1214 // Only warn for unused decls internal to the translation unit. 1215 if (D->getLinkage() == ExternalLinkage) 1216 return false; 1217 1218 return true; 1219} 1220 1221void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1222 if (!D) 1223 return; 1224 1225 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1226 const FunctionDecl *First = FD->getFirstDeclaration(); 1227 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1228 return; // First should already be in the vector. 1229 } 1230 1231 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1232 const VarDecl *First = VD->getFirstDeclaration(); 1233 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1234 return; // First should already be in the vector. 1235 } 1236 1237 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1238 UnusedFileScopedDecls.push_back(D); 1239} 1240 1241static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1242 if (D->isInvalidDecl()) 1243 return false; 1244 1245 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1246 return false; 1247 1248 if (isa<LabelDecl>(D)) 1249 return true; 1250 1251 // White-list anything that isn't a local variable. 1252 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1253 !D->getDeclContext()->isFunctionOrMethod()) 1254 return false; 1255 1256 // Types of valid local variables should be complete, so this should succeed. 1257 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1258 1259 // White-list anything with an __attribute__((unused)) type. 1260 QualType Ty = VD->getType(); 1261 1262 // Only look at the outermost level of typedef. 1263 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1264 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1265 return false; 1266 } 1267 1268 // If we failed to complete the type for some reason, or if the type is 1269 // dependent, don't diagnose the variable. 1270 if (Ty->isIncompleteType() || Ty->isDependentType()) 1271 return false; 1272 1273 if (const TagType *TT = Ty->getAs<TagType>()) { 1274 const TagDecl *Tag = TT->getDecl(); 1275 if (Tag->hasAttr<UnusedAttr>()) 1276 return false; 1277 1278 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1279 if (!RD->hasTrivialDestructor()) 1280 return false; 1281 1282 if (const Expr *Init = VD->getInit()) { 1283 const CXXConstructExpr *Construct = 1284 dyn_cast<CXXConstructExpr>(Init); 1285 if (Construct && !Construct->isElidable()) { 1286 CXXConstructorDecl *CD = Construct->getConstructor(); 1287 if (!CD->isTrivial()) 1288 return false; 1289 } 1290 } 1291 } 1292 } 1293 1294 // TODO: __attribute__((unused)) templates? 1295 } 1296 1297 return true; 1298} 1299 1300static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1301 FixItHint &Hint) { 1302 if (isa<LabelDecl>(D)) { 1303 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1304 tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), true); 1305 if (AfterColon.isInvalid()) 1306 return; 1307 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1308 getCharRange(D->getLocStart(), AfterColon)); 1309 } 1310 return; 1311} 1312 1313/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1314/// unless they are marked attr(unused). 1315void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1316 FixItHint Hint; 1317 if (!ShouldDiagnoseUnusedDecl(D)) 1318 return; 1319 1320 GenerateFixForUnusedDecl(D, Context, Hint); 1321 1322 unsigned DiagID; 1323 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1324 DiagID = diag::warn_unused_exception_param; 1325 else if (isa<LabelDecl>(D)) 1326 DiagID = diag::warn_unused_label; 1327 else 1328 DiagID = diag::warn_unused_variable; 1329 1330 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1331} 1332 1333static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1334 // Verify that we have no forward references left. If so, there was a goto 1335 // or address of a label taken, but no definition of it. Label fwd 1336 // definitions are indicated with a null substmt. 1337 if (L->getStmt() == 0) 1338 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1339} 1340 1341void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1342 if (S->decl_empty()) return; 1343 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1344 "Scope shouldn't contain decls!"); 1345 1346 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1347 I != E; ++I) { 1348 Decl *TmpD = (*I); 1349 assert(TmpD && "This decl didn't get pushed??"); 1350 1351 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1352 NamedDecl *D = cast<NamedDecl>(TmpD); 1353 1354 if (!D->getDeclName()) continue; 1355 1356 // Diagnose unused variables in this scope. 1357 if (!S->hasErrorOccurred()) 1358 DiagnoseUnusedDecl(D); 1359 1360 // If this was a forward reference to a label, verify it was defined. 1361 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1362 CheckPoppedLabel(LD, *this); 1363 1364 // Remove this name from our lexical scope. 1365 IdResolver.RemoveDecl(D); 1366 } 1367} 1368 1369void Sema::ActOnStartFunctionDeclarator() { 1370 ++InFunctionDeclarator; 1371} 1372 1373void Sema::ActOnEndFunctionDeclarator() { 1374 assert(InFunctionDeclarator); 1375 --InFunctionDeclarator; 1376} 1377 1378/// \brief Look for an Objective-C class in the translation unit. 1379/// 1380/// \param Id The name of the Objective-C class we're looking for. If 1381/// typo-correction fixes this name, the Id will be updated 1382/// to the fixed name. 1383/// 1384/// \param IdLoc The location of the name in the translation unit. 1385/// 1386/// \param DoTypoCorrection If true, this routine will attempt typo correction 1387/// if there is no class with the given name. 1388/// 1389/// \returns The declaration of the named Objective-C class, or NULL if the 1390/// class could not be found. 1391ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1392 SourceLocation IdLoc, 1393 bool DoTypoCorrection) { 1394 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1395 // creation from this context. 1396 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1397 1398 if (!IDecl && DoTypoCorrection) { 1399 // Perform typo correction at the given location, but only if we 1400 // find an Objective-C class name. 1401 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1402 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1403 LookupOrdinaryName, TUScope, NULL, 1404 Validator)) { 1405 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1406 Diag(IdLoc, diag::err_undef_interface_suggest) 1407 << Id << IDecl->getDeclName() 1408 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1409 Diag(IDecl->getLocation(), diag::note_previous_decl) 1410 << IDecl->getDeclName(); 1411 1412 Id = IDecl->getIdentifier(); 1413 } 1414 } 1415 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1416 // This routine must always return a class definition, if any. 1417 if (Def && Def->getDefinition()) 1418 Def = Def->getDefinition(); 1419 return Def; 1420} 1421 1422/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1423/// from S, where a non-field would be declared. This routine copes 1424/// with the difference between C and C++ scoping rules in structs and 1425/// unions. For example, the following code is well-formed in C but 1426/// ill-formed in C++: 1427/// @code 1428/// struct S6 { 1429/// enum { BAR } e; 1430/// }; 1431/// 1432/// void test_S6() { 1433/// struct S6 a; 1434/// a.e = BAR; 1435/// } 1436/// @endcode 1437/// For the declaration of BAR, this routine will return a different 1438/// scope. The scope S will be the scope of the unnamed enumeration 1439/// within S6. In C++, this routine will return the scope associated 1440/// with S6, because the enumeration's scope is a transparent 1441/// context but structures can contain non-field names. In C, this 1442/// routine will return the translation unit scope, since the 1443/// enumeration's scope is a transparent context and structures cannot 1444/// contain non-field names. 1445Scope *Sema::getNonFieldDeclScope(Scope *S) { 1446 while (((S->getFlags() & Scope::DeclScope) == 0) || 1447 (S->getEntity() && 1448 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1449 (S->isClassScope() && !getLangOpts().CPlusPlus)) 1450 S = S->getParent(); 1451 return S; 1452} 1453 1454/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1455/// file scope. lazily create a decl for it. ForRedeclaration is true 1456/// if we're creating this built-in in anticipation of redeclaring the 1457/// built-in. 1458NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1459 Scope *S, bool ForRedeclaration, 1460 SourceLocation Loc) { 1461 Builtin::ID BID = (Builtin::ID)bid; 1462 1463 ASTContext::GetBuiltinTypeError Error; 1464 QualType R = Context.GetBuiltinType(BID, Error); 1465 switch (Error) { 1466 case ASTContext::GE_None: 1467 // Okay 1468 break; 1469 1470 case ASTContext::GE_Missing_stdio: 1471 if (ForRedeclaration) 1472 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1473 << Context.BuiltinInfo.GetName(BID); 1474 return 0; 1475 1476 case ASTContext::GE_Missing_setjmp: 1477 if (ForRedeclaration) 1478 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1479 << Context.BuiltinInfo.GetName(BID); 1480 return 0; 1481 1482 case ASTContext::GE_Missing_ucontext: 1483 if (ForRedeclaration) 1484 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1485 << Context.BuiltinInfo.GetName(BID); 1486 return 0; 1487 } 1488 1489 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1490 Diag(Loc, diag::ext_implicit_lib_function_decl) 1491 << Context.BuiltinInfo.GetName(BID) 1492 << R; 1493 if (Context.BuiltinInfo.getHeaderName(BID) && 1494 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1495 != DiagnosticsEngine::Ignored) 1496 Diag(Loc, diag::note_please_include_header) 1497 << Context.BuiltinInfo.getHeaderName(BID) 1498 << Context.BuiltinInfo.GetName(BID); 1499 } 1500 1501 FunctionDecl *New = FunctionDecl::Create(Context, 1502 Context.getTranslationUnitDecl(), 1503 Loc, Loc, II, R, /*TInfo=*/0, 1504 SC_Extern, 1505 SC_None, false, 1506 /*hasPrototype=*/true); 1507 New->setImplicit(); 1508 1509 // Create Decl objects for each parameter, adding them to the 1510 // FunctionDecl. 1511 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1512 SmallVector<ParmVarDecl*, 16> Params; 1513 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1514 ParmVarDecl *parm = 1515 ParmVarDecl::Create(Context, New, SourceLocation(), 1516 SourceLocation(), 0, 1517 FT->getArgType(i), /*TInfo=*/0, 1518 SC_None, SC_None, 0); 1519 parm->setScopeInfo(0, i); 1520 Params.push_back(parm); 1521 } 1522 New->setParams(Params); 1523 } 1524 1525 AddKnownFunctionAttributes(New); 1526 1527 // TUScope is the translation-unit scope to insert this function into. 1528 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1529 // relate Scopes to DeclContexts, and probably eliminate CurContext 1530 // entirely, but we're not there yet. 1531 DeclContext *SavedContext = CurContext; 1532 CurContext = Context.getTranslationUnitDecl(); 1533 PushOnScopeChains(New, TUScope); 1534 CurContext = SavedContext; 1535 return New; 1536} 1537 1538bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1539 QualType OldType; 1540 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1541 OldType = OldTypedef->getUnderlyingType(); 1542 else 1543 OldType = Context.getTypeDeclType(Old); 1544 QualType NewType = New->getUnderlyingType(); 1545 1546 if (NewType->isVariablyModifiedType()) { 1547 // Must not redefine a typedef with a variably-modified type. 1548 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1549 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1550 << Kind << NewType; 1551 if (Old->getLocation().isValid()) 1552 Diag(Old->getLocation(), diag::note_previous_definition); 1553 New->setInvalidDecl(); 1554 return true; 1555 } 1556 1557 if (OldType != NewType && 1558 !OldType->isDependentType() && 1559 !NewType->isDependentType() && 1560 !Context.hasSameType(OldType, NewType)) { 1561 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1562 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1563 << Kind << NewType << OldType; 1564 if (Old->getLocation().isValid()) 1565 Diag(Old->getLocation(), diag::note_previous_definition); 1566 New->setInvalidDecl(); 1567 return true; 1568 } 1569 return false; 1570} 1571 1572/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1573/// same name and scope as a previous declaration 'Old'. Figure out 1574/// how to resolve this situation, merging decls or emitting 1575/// diagnostics as appropriate. If there was an error, set New to be invalid. 1576/// 1577void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1578 // If the new decl is known invalid already, don't bother doing any 1579 // merging checks. 1580 if (New->isInvalidDecl()) return; 1581 1582 // Allow multiple definitions for ObjC built-in typedefs. 1583 // FIXME: Verify the underlying types are equivalent! 1584 if (getLangOpts().ObjC1) { 1585 const IdentifierInfo *TypeID = New->getIdentifier(); 1586 switch (TypeID->getLength()) { 1587 default: break; 1588 case 2: 1589 { 1590 if (!TypeID->isStr("id")) 1591 break; 1592 QualType T = New->getUnderlyingType(); 1593 if (!T->isPointerType()) 1594 break; 1595 if (!T->isVoidPointerType()) { 1596 QualType PT = T->getAs<PointerType>()->getPointeeType(); 1597 if (!PT->isStructureType()) 1598 break; 1599 } 1600 Context.setObjCIdRedefinitionType(T); 1601 // Install the built-in type for 'id', ignoring the current definition. 1602 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1603 return; 1604 } 1605 case 5: 1606 if (!TypeID->isStr("Class")) 1607 break; 1608 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1609 // Install the built-in type for 'Class', ignoring the current definition. 1610 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1611 return; 1612 case 3: 1613 if (!TypeID->isStr("SEL")) 1614 break; 1615 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1616 // Install the built-in type for 'SEL', ignoring the current definition. 1617 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1618 return; 1619 } 1620 // Fall through - the typedef name was not a builtin type. 1621 } 1622 1623 // Verify the old decl was also a type. 1624 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1625 if (!Old) { 1626 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1627 << New->getDeclName(); 1628 1629 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1630 if (OldD->getLocation().isValid()) 1631 Diag(OldD->getLocation(), diag::note_previous_definition); 1632 1633 return New->setInvalidDecl(); 1634 } 1635 1636 // If the old declaration is invalid, just give up here. 1637 if (Old->isInvalidDecl()) 1638 return New->setInvalidDecl(); 1639 1640 // If the typedef types are not identical, reject them in all languages and 1641 // with any extensions enabled. 1642 if (isIncompatibleTypedef(Old, New)) 1643 return; 1644 1645 // The types match. Link up the redeclaration chain if the old 1646 // declaration was a typedef. 1647 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1648 New->setPreviousDeclaration(Typedef); 1649 1650 if (getLangOpts().MicrosoftExt) 1651 return; 1652 1653 if (getLangOpts().CPlusPlus) { 1654 // C++ [dcl.typedef]p2: 1655 // In a given non-class scope, a typedef specifier can be used to 1656 // redefine the name of any type declared in that scope to refer 1657 // to the type to which it already refers. 1658 if (!isa<CXXRecordDecl>(CurContext)) 1659 return; 1660 1661 // C++0x [dcl.typedef]p4: 1662 // In a given class scope, a typedef specifier can be used to redefine 1663 // any class-name declared in that scope that is not also a typedef-name 1664 // to refer to the type to which it already refers. 1665 // 1666 // This wording came in via DR424, which was a correction to the 1667 // wording in DR56, which accidentally banned code like: 1668 // 1669 // struct S { 1670 // typedef struct A { } A; 1671 // }; 1672 // 1673 // in the C++03 standard. We implement the C++0x semantics, which 1674 // allow the above but disallow 1675 // 1676 // struct S { 1677 // typedef int I; 1678 // typedef int I; 1679 // }; 1680 // 1681 // since that was the intent of DR56. 1682 if (!isa<TypedefNameDecl>(Old)) 1683 return; 1684 1685 Diag(New->getLocation(), diag::err_redefinition) 1686 << New->getDeclName(); 1687 Diag(Old->getLocation(), diag::note_previous_definition); 1688 return New->setInvalidDecl(); 1689 } 1690 1691 // Modules always permit redefinition of typedefs, as does C11. 1692 if (getLangOpts().Modules || getLangOpts().C11) 1693 return; 1694 1695 // If we have a redefinition of a typedef in C, emit a warning. This warning 1696 // is normally mapped to an error, but can be controlled with 1697 // -Wtypedef-redefinition. If either the original or the redefinition is 1698 // in a system header, don't emit this for compatibility with GCC. 1699 if (getDiagnostics().getSuppressSystemWarnings() && 1700 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1701 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1702 return; 1703 1704 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1705 << New->getDeclName(); 1706 Diag(Old->getLocation(), diag::note_previous_definition); 1707 return; 1708} 1709 1710/// DeclhasAttr - returns true if decl Declaration already has the target 1711/// attribute. 1712static bool 1713DeclHasAttr(const Decl *D, const Attr *A) { 1714 // There can be multiple AvailabilityAttr in a Decl. Make sure we copy 1715 // all of them. It is mergeAvailabilityAttr in SemaDeclAttr.cpp that is 1716 // responsible for making sure they are consistent. 1717 const AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(A); 1718 if (AA) 1719 return false; 1720 1721 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1722 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1723 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1724 if ((*i)->getKind() == A->getKind()) { 1725 if (Ann) { 1726 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1727 return true; 1728 continue; 1729 } 1730 // FIXME: Don't hardcode this check 1731 if (OA && isa<OwnershipAttr>(*i)) 1732 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1733 return true; 1734 } 1735 1736 return false; 1737} 1738 1739bool Sema::mergeDeclAttribute(Decl *D, InheritableAttr *Attr) { 1740 InheritableAttr *NewAttr = NULL; 1741 if (AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(Attr)) 1742 NewAttr = mergeAvailabilityAttr(D, AA->getRange(), AA->getPlatform(), 1743 AA->getIntroduced(), AA->getDeprecated(), 1744 AA->getObsoleted(), AA->getUnavailable(), 1745 AA->getMessage()); 1746 else if (VisibilityAttr *VA = dyn_cast<VisibilityAttr>(Attr)) 1747 NewAttr = mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility()); 1748 else if (DLLImportAttr *ImportA = dyn_cast<DLLImportAttr>(Attr)) 1749 NewAttr = mergeDLLImportAttr(D, ImportA->getRange()); 1750 else if (DLLExportAttr *ExportA = dyn_cast<DLLExportAttr>(Attr)) 1751 NewAttr = mergeDLLExportAttr(D, ExportA->getRange()); 1752 else if (FormatAttr *FA = dyn_cast<FormatAttr>(Attr)) 1753 NewAttr = mergeFormatAttr(D, FA->getRange(), FA->getType(), 1754 FA->getFormatIdx(), FA->getFirstArg()); 1755 else if (SectionAttr *SA = dyn_cast<SectionAttr>(Attr)) 1756 NewAttr = mergeSectionAttr(D, SA->getRange(), SA->getName()); 1757 else if (!DeclHasAttr(D, Attr)) 1758 NewAttr = cast<InheritableAttr>(Attr->clone(Context)); 1759 1760 if (NewAttr) { 1761 NewAttr->setInherited(true); 1762 D->addAttr(NewAttr); 1763 return true; 1764 } 1765 1766 return false; 1767} 1768 1769static const Decl *getDefinition(const Decl *D) { 1770 if (const TagDecl *TD = dyn_cast<TagDecl>(D)) 1771 return TD->getDefinition(); 1772 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 1773 return VD->getDefinition(); 1774 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1775 const FunctionDecl* Def; 1776 if (FD->hasBody(Def)) 1777 return Def; 1778 } 1779 return NULL; 1780} 1781 1782static bool hasAttribute(const Decl *D, attr::Kind Kind) { 1783 for (Decl::attr_iterator I = D->attr_begin(), E = D->attr_end(); 1784 I != E; ++I) { 1785 Attr *Attribute = *I; 1786 if (Attribute->getKind() == Kind) 1787 return true; 1788 } 1789 return false; 1790} 1791 1792/// checkNewAttributesAfterDef - If we already have a definition, check that 1793/// there are no new attributes in this declaration. 1794static void checkNewAttributesAfterDef(Sema &S, Decl *New, const Decl *Old) { 1795 if (!New->hasAttrs()) 1796 return; 1797 1798 const Decl *Def = getDefinition(Old); 1799 if (!Def || Def == New) 1800 return; 1801 1802 AttrVec &NewAttributes = New->getAttrs(); 1803 for (unsigned I = 0, E = NewAttributes.size(); I != E;) { 1804 const Attr *NewAttribute = NewAttributes[I]; 1805 if (hasAttribute(Def, NewAttribute->getKind())) { 1806 ++I; 1807 continue; // regular attr merging will take care of validating this. 1808 } 1809 S.Diag(NewAttribute->getLocation(), 1810 diag::warn_attribute_precede_definition); 1811 S.Diag(Def->getLocation(), diag::note_previous_definition); 1812 NewAttributes.erase(NewAttributes.begin() + I); 1813 --E; 1814 } 1815} 1816 1817/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1818void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1819 bool MergeDeprecation) { 1820 // attributes declared post-definition are currently ignored 1821 checkNewAttributesAfterDef(*this, New, Old); 1822 1823 if (!Old->hasAttrs()) 1824 return; 1825 1826 bool foundAny = New->hasAttrs(); 1827 1828 // Ensure that any moving of objects within the allocated map is done before 1829 // we process them. 1830 if (!foundAny) New->setAttrs(AttrVec()); 1831 1832 for (specific_attr_iterator<InheritableAttr> 1833 i = Old->specific_attr_begin<InheritableAttr>(), 1834 e = Old->specific_attr_end<InheritableAttr>(); 1835 i != e; ++i) { 1836 // Ignore deprecated/unavailable/availability attributes if requested. 1837 if (!MergeDeprecation && 1838 (isa<DeprecatedAttr>(*i) || 1839 isa<UnavailableAttr>(*i) || 1840 isa<AvailabilityAttr>(*i))) 1841 continue; 1842 1843 if (mergeDeclAttribute(New, *i)) 1844 foundAny = true; 1845 } 1846 1847 if (!foundAny) New->dropAttrs(); 1848} 1849 1850/// mergeParamDeclAttributes - Copy attributes from the old parameter 1851/// to the new one. 1852static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1853 const ParmVarDecl *oldDecl, 1854 ASTContext &C) { 1855 if (!oldDecl->hasAttrs()) 1856 return; 1857 1858 bool foundAny = newDecl->hasAttrs(); 1859 1860 // Ensure that any moving of objects within the allocated map is 1861 // done before we process them. 1862 if (!foundAny) newDecl->setAttrs(AttrVec()); 1863 1864 for (specific_attr_iterator<InheritableParamAttr> 1865 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1866 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1867 if (!DeclHasAttr(newDecl, *i)) { 1868 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1869 newAttr->setInherited(true); 1870 newDecl->addAttr(newAttr); 1871 foundAny = true; 1872 } 1873 } 1874 1875 if (!foundAny) newDecl->dropAttrs(); 1876} 1877 1878namespace { 1879 1880/// Used in MergeFunctionDecl to keep track of function parameters in 1881/// C. 1882struct GNUCompatibleParamWarning { 1883 ParmVarDecl *OldParm; 1884 ParmVarDecl *NewParm; 1885 QualType PromotedType; 1886}; 1887 1888} 1889 1890/// getSpecialMember - get the special member enum for a method. 1891Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1892 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1893 if (Ctor->isDefaultConstructor()) 1894 return Sema::CXXDefaultConstructor; 1895 1896 if (Ctor->isCopyConstructor()) 1897 return Sema::CXXCopyConstructor; 1898 1899 if (Ctor->isMoveConstructor()) 1900 return Sema::CXXMoveConstructor; 1901 } else if (isa<CXXDestructorDecl>(MD)) { 1902 return Sema::CXXDestructor; 1903 } else if (MD->isCopyAssignmentOperator()) { 1904 return Sema::CXXCopyAssignment; 1905 } else if (MD->isMoveAssignmentOperator()) { 1906 return Sema::CXXMoveAssignment; 1907 } 1908 1909 return Sema::CXXInvalid; 1910} 1911 1912/// canRedefineFunction - checks if a function can be redefined. Currently, 1913/// only extern inline functions can be redefined, and even then only in 1914/// GNU89 mode. 1915static bool canRedefineFunction(const FunctionDecl *FD, 1916 const LangOptions& LangOpts) { 1917 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1918 !LangOpts.CPlusPlus && 1919 FD->isInlineSpecified() && 1920 FD->getStorageClass() == SC_Extern); 1921} 1922 1923/// Is the given calling convention the ABI default for the given 1924/// declaration? 1925static bool isABIDefaultCC(Sema &S, CallingConv CC, FunctionDecl *D) { 1926 CallingConv ABIDefaultCC; 1927 if (isa<CXXMethodDecl>(D) && cast<CXXMethodDecl>(D)->isInstance()) { 1928 ABIDefaultCC = S.Context.getDefaultCXXMethodCallConv(D->isVariadic()); 1929 } else { 1930 // Free C function or a static method. 1931 ABIDefaultCC = (S.Context.getLangOpts().MRTD ? CC_X86StdCall : CC_C); 1932 } 1933 return ABIDefaultCC == CC; 1934} 1935 1936/// MergeFunctionDecl - We just parsed a function 'New' from 1937/// declarator D which has the same name and scope as a previous 1938/// declaration 'Old'. Figure out how to resolve this situation, 1939/// merging decls or emitting diagnostics as appropriate. 1940/// 1941/// In C++, New and Old must be declarations that are not 1942/// overloaded. Use IsOverload to determine whether New and Old are 1943/// overloaded, and to select the Old declaration that New should be 1944/// merged with. 1945/// 1946/// Returns true if there was an error, false otherwise. 1947bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) { 1948 // Verify the old decl was also a function. 1949 FunctionDecl *Old = 0; 1950 if (FunctionTemplateDecl *OldFunctionTemplate 1951 = dyn_cast<FunctionTemplateDecl>(OldD)) 1952 Old = OldFunctionTemplate->getTemplatedDecl(); 1953 else 1954 Old = dyn_cast<FunctionDecl>(OldD); 1955 if (!Old) { 1956 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1957 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1958 Diag(Shadow->getTargetDecl()->getLocation(), 1959 diag::note_using_decl_target); 1960 Diag(Shadow->getUsingDecl()->getLocation(), 1961 diag::note_using_decl) << 0; 1962 return true; 1963 } 1964 1965 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1966 << New->getDeclName(); 1967 Diag(OldD->getLocation(), diag::note_previous_definition); 1968 return true; 1969 } 1970 1971 // Determine whether the previous declaration was a definition, 1972 // implicit declaration, or a declaration. 1973 diag::kind PrevDiag; 1974 if (Old->isThisDeclarationADefinition()) 1975 PrevDiag = diag::note_previous_definition; 1976 else if (Old->isImplicit()) 1977 PrevDiag = diag::note_previous_implicit_declaration; 1978 else 1979 PrevDiag = diag::note_previous_declaration; 1980 1981 QualType OldQType = Context.getCanonicalType(Old->getType()); 1982 QualType NewQType = Context.getCanonicalType(New->getType()); 1983 1984 // Don't complain about this if we're in GNU89 mode and the old function 1985 // is an extern inline function. 1986 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1987 New->getStorageClass() == SC_Static && 1988 Old->getStorageClass() != SC_Static && 1989 !canRedefineFunction(Old, getLangOpts())) { 1990 if (getLangOpts().MicrosoftExt) { 1991 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1992 Diag(Old->getLocation(), PrevDiag); 1993 } else { 1994 Diag(New->getLocation(), diag::err_static_non_static) << New; 1995 Diag(Old->getLocation(), PrevDiag); 1996 return true; 1997 } 1998 } 1999 2000 // If a function is first declared with a calling convention, but is 2001 // later declared or defined without one, the second decl assumes the 2002 // calling convention of the first. 2003 // 2004 // It's OK if a function is first declared without a calling convention, 2005 // but is later declared or defined with the default calling convention. 2006 // 2007 // For the new decl, we have to look at the NON-canonical type to tell the 2008 // difference between a function that really doesn't have a calling 2009 // convention and one that is declared cdecl. That's because in 2010 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 2011 // because it is the default calling convention. 2012 // 2013 // Note also that we DO NOT return at this point, because we still have 2014 // other tests to run. 2015 const FunctionType *OldType = cast<FunctionType>(OldQType); 2016 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 2017 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 2018 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 2019 bool RequiresAdjustment = false; 2020 if (OldTypeInfo.getCC() == NewTypeInfo.getCC()) { 2021 // Fast path: nothing to do. 2022 2023 // Inherit the CC from the previous declaration if it was specified 2024 // there but not here. 2025 } else if (NewTypeInfo.getCC() == CC_Default) { 2026 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 2027 RequiresAdjustment = true; 2028 2029 // Don't complain about mismatches when the default CC is 2030 // effectively the same as the explict one. 2031 } else if (OldTypeInfo.getCC() == CC_Default && 2032 isABIDefaultCC(*this, NewTypeInfo.getCC(), New)) { 2033 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 2034 RequiresAdjustment = true; 2035 2036 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 2037 NewTypeInfo.getCC())) { 2038 // Calling conventions really aren't compatible, so complain. 2039 Diag(New->getLocation(), diag::err_cconv_change) 2040 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 2041 << (OldTypeInfo.getCC() == CC_Default) 2042 << (OldTypeInfo.getCC() == CC_Default ? "" : 2043 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 2044 Diag(Old->getLocation(), diag::note_previous_declaration); 2045 return true; 2046 } 2047 2048 // FIXME: diagnose the other way around? 2049 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 2050 NewTypeInfo = NewTypeInfo.withNoReturn(true); 2051 RequiresAdjustment = true; 2052 } 2053 2054 // Merge regparm attribute. 2055 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 2056 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 2057 if (NewTypeInfo.getHasRegParm()) { 2058 Diag(New->getLocation(), diag::err_regparm_mismatch) 2059 << NewType->getRegParmType() 2060 << OldType->getRegParmType(); 2061 Diag(Old->getLocation(), diag::note_previous_declaration); 2062 return true; 2063 } 2064 2065 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 2066 RequiresAdjustment = true; 2067 } 2068 2069 // Merge ns_returns_retained attribute. 2070 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 2071 if (NewTypeInfo.getProducesResult()) { 2072 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 2073 Diag(Old->getLocation(), diag::note_previous_declaration); 2074 return true; 2075 } 2076 2077 NewTypeInfo = NewTypeInfo.withProducesResult(true); 2078 RequiresAdjustment = true; 2079 } 2080 2081 if (RequiresAdjustment) { 2082 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 2083 New->setType(QualType(NewType, 0)); 2084 NewQType = Context.getCanonicalType(New->getType()); 2085 } 2086 2087 if (getLangOpts().CPlusPlus) { 2088 // (C++98 13.1p2): 2089 // Certain function declarations cannot be overloaded: 2090 // -- Function declarations that differ only in the return type 2091 // cannot be overloaded. 2092 QualType OldReturnType = OldType->getResultType(); 2093 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 2094 QualType ResQT; 2095 if (OldReturnType != NewReturnType) { 2096 if (NewReturnType->isObjCObjectPointerType() 2097 && OldReturnType->isObjCObjectPointerType()) 2098 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 2099 if (ResQT.isNull()) { 2100 if (New->isCXXClassMember() && New->isOutOfLine()) 2101 Diag(New->getLocation(), 2102 diag::err_member_def_does_not_match_ret_type) << New; 2103 else 2104 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 2105 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2106 return true; 2107 } 2108 else 2109 NewQType = ResQT; 2110 } 2111 2112 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 2113 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 2114 if (OldMethod && NewMethod) { 2115 // Preserve triviality. 2116 NewMethod->setTrivial(OldMethod->isTrivial()); 2117 2118 // MSVC allows explicit template specialization at class scope: 2119 // 2 CXMethodDecls referring to the same function will be injected. 2120 // We don't want a redeclartion error. 2121 bool IsClassScopeExplicitSpecialization = 2122 OldMethod->isFunctionTemplateSpecialization() && 2123 NewMethod->isFunctionTemplateSpecialization(); 2124 bool isFriend = NewMethod->getFriendObjectKind(); 2125 2126 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 2127 !IsClassScopeExplicitSpecialization) { 2128 // -- Member function declarations with the same name and the 2129 // same parameter types cannot be overloaded if any of them 2130 // is a static member function declaration. 2131 if (OldMethod->isStatic() || NewMethod->isStatic()) { 2132 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 2133 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2134 return true; 2135 } 2136 2137 // C++ [class.mem]p1: 2138 // [...] A member shall not be declared twice in the 2139 // member-specification, except that a nested class or member 2140 // class template can be declared and then later defined. 2141 if (ActiveTemplateInstantiations.empty()) { 2142 unsigned NewDiag; 2143 if (isa<CXXConstructorDecl>(OldMethod)) 2144 NewDiag = diag::err_constructor_redeclared; 2145 else if (isa<CXXDestructorDecl>(NewMethod)) 2146 NewDiag = diag::err_destructor_redeclared; 2147 else if (isa<CXXConversionDecl>(NewMethod)) 2148 NewDiag = diag::err_conv_function_redeclared; 2149 else 2150 NewDiag = diag::err_member_redeclared; 2151 2152 Diag(New->getLocation(), NewDiag); 2153 } else { 2154 Diag(New->getLocation(), diag::err_member_redeclared_in_instantiation) 2155 << New << New->getType(); 2156 } 2157 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2158 2159 // Complain if this is an explicit declaration of a special 2160 // member that was initially declared implicitly. 2161 // 2162 // As an exception, it's okay to befriend such methods in order 2163 // to permit the implicit constructor/destructor/operator calls. 2164 } else if (OldMethod->isImplicit()) { 2165 if (isFriend) { 2166 NewMethod->setImplicit(); 2167 } else { 2168 Diag(NewMethod->getLocation(), 2169 diag::err_definition_of_implicitly_declared_member) 2170 << New << getSpecialMember(OldMethod); 2171 return true; 2172 } 2173 } else if (OldMethod->isExplicitlyDefaulted() && !isFriend) { 2174 Diag(NewMethod->getLocation(), 2175 diag::err_definition_of_explicitly_defaulted_member) 2176 << getSpecialMember(OldMethod); 2177 return true; 2178 } 2179 } 2180 2181 // (C++98 8.3.5p3): 2182 // All declarations for a function shall agree exactly in both the 2183 // return type and the parameter-type-list. 2184 // We also want to respect all the extended bits except noreturn. 2185 2186 // noreturn should now match unless the old type info didn't have it. 2187 QualType OldQTypeForComparison = OldQType; 2188 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 2189 assert(OldQType == QualType(OldType, 0)); 2190 const FunctionType *OldTypeForComparison 2191 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 2192 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 2193 assert(OldQTypeForComparison.isCanonical()); 2194 } 2195 2196 if (OldQTypeForComparison == NewQType) 2197 return MergeCompatibleFunctionDecls(New, Old, S); 2198 2199 // Fall through for conflicting redeclarations and redefinitions. 2200 } 2201 2202 // C: Function types need to be compatible, not identical. This handles 2203 // duplicate function decls like "void f(int); void f(enum X);" properly. 2204 if (!getLangOpts().CPlusPlus && 2205 Context.typesAreCompatible(OldQType, NewQType)) { 2206 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 2207 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 2208 const FunctionProtoType *OldProto = 0; 2209 if (isa<FunctionNoProtoType>(NewFuncType) && 2210 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 2211 // The old declaration provided a function prototype, but the 2212 // new declaration does not. Merge in the prototype. 2213 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 2214 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 2215 OldProto->arg_type_end()); 2216 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 2217 ParamTypes.data(), ParamTypes.size(), 2218 OldProto->getExtProtoInfo()); 2219 New->setType(NewQType); 2220 New->setHasInheritedPrototype(); 2221 2222 // Synthesize a parameter for each argument type. 2223 SmallVector<ParmVarDecl*, 16> Params; 2224 for (FunctionProtoType::arg_type_iterator 2225 ParamType = OldProto->arg_type_begin(), 2226 ParamEnd = OldProto->arg_type_end(); 2227 ParamType != ParamEnd; ++ParamType) { 2228 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 2229 SourceLocation(), 2230 SourceLocation(), 0, 2231 *ParamType, /*TInfo=*/0, 2232 SC_None, SC_None, 2233 0); 2234 Param->setScopeInfo(0, Params.size()); 2235 Param->setImplicit(); 2236 Params.push_back(Param); 2237 } 2238 2239 New->setParams(Params); 2240 } 2241 2242 return MergeCompatibleFunctionDecls(New, Old, S); 2243 } 2244 2245 // GNU C permits a K&R definition to follow a prototype declaration 2246 // if the declared types of the parameters in the K&R definition 2247 // match the types in the prototype declaration, even when the 2248 // promoted types of the parameters from the K&R definition differ 2249 // from the types in the prototype. GCC then keeps the types from 2250 // the prototype. 2251 // 2252 // If a variadic prototype is followed by a non-variadic K&R definition, 2253 // the K&R definition becomes variadic. This is sort of an edge case, but 2254 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2255 // C99 6.9.1p8. 2256 if (!getLangOpts().CPlusPlus && 2257 Old->hasPrototype() && !New->hasPrototype() && 2258 New->getType()->getAs<FunctionProtoType>() && 2259 Old->getNumParams() == New->getNumParams()) { 2260 SmallVector<QualType, 16> ArgTypes; 2261 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2262 const FunctionProtoType *OldProto 2263 = Old->getType()->getAs<FunctionProtoType>(); 2264 const FunctionProtoType *NewProto 2265 = New->getType()->getAs<FunctionProtoType>(); 2266 2267 // Determine whether this is the GNU C extension. 2268 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2269 NewProto->getResultType()); 2270 bool LooseCompatible = !MergedReturn.isNull(); 2271 for (unsigned Idx = 0, End = Old->getNumParams(); 2272 LooseCompatible && Idx != End; ++Idx) { 2273 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2274 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2275 if (Context.typesAreCompatible(OldParm->getType(), 2276 NewProto->getArgType(Idx))) { 2277 ArgTypes.push_back(NewParm->getType()); 2278 } else if (Context.typesAreCompatible(OldParm->getType(), 2279 NewParm->getType(), 2280 /*CompareUnqualified=*/true)) { 2281 GNUCompatibleParamWarning Warn 2282 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2283 Warnings.push_back(Warn); 2284 ArgTypes.push_back(NewParm->getType()); 2285 } else 2286 LooseCompatible = false; 2287 } 2288 2289 if (LooseCompatible) { 2290 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2291 Diag(Warnings[Warn].NewParm->getLocation(), 2292 diag::ext_param_promoted_not_compatible_with_prototype) 2293 << Warnings[Warn].PromotedType 2294 << Warnings[Warn].OldParm->getType(); 2295 if (Warnings[Warn].OldParm->getLocation().isValid()) 2296 Diag(Warnings[Warn].OldParm->getLocation(), 2297 diag::note_previous_declaration); 2298 } 2299 2300 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2301 ArgTypes.size(), 2302 OldProto->getExtProtoInfo())); 2303 return MergeCompatibleFunctionDecls(New, Old, S); 2304 } 2305 2306 // Fall through to diagnose conflicting types. 2307 } 2308 2309 // A function that has already been declared has been redeclared or defined 2310 // with a different type- show appropriate diagnostic 2311 if (unsigned BuiltinID = Old->getBuiltinID()) { 2312 // The user has declared a builtin function with an incompatible 2313 // signature. 2314 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2315 // The function the user is redeclaring is a library-defined 2316 // function like 'malloc' or 'printf'. Warn about the 2317 // redeclaration, then pretend that we don't know about this 2318 // library built-in. 2319 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2320 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2321 << Old << Old->getType(); 2322 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2323 Old->setInvalidDecl(); 2324 return false; 2325 } 2326 2327 PrevDiag = diag::note_previous_builtin_declaration; 2328 } 2329 2330 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2331 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2332 return true; 2333} 2334 2335/// \brief Completes the merge of two function declarations that are 2336/// known to be compatible. 2337/// 2338/// This routine handles the merging of attributes and other 2339/// properties of function declarations form the old declaration to 2340/// the new declaration, once we know that New is in fact a 2341/// redeclaration of Old. 2342/// 2343/// \returns false 2344bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old, 2345 Scope *S) { 2346 // Merge the attributes 2347 mergeDeclAttributes(New, Old); 2348 2349 // Merge the storage class. 2350 if (Old->getStorageClass() != SC_Extern && 2351 Old->getStorageClass() != SC_None) 2352 New->setStorageClass(Old->getStorageClass()); 2353 2354 // Merge "pure" flag. 2355 if (Old->isPure()) 2356 New->setPure(); 2357 2358 // Merge attributes from the parameters. These can mismatch with K&R 2359 // declarations. 2360 if (New->getNumParams() == Old->getNumParams()) 2361 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2362 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2363 Context); 2364 2365 if (getLangOpts().CPlusPlus) 2366 return MergeCXXFunctionDecl(New, Old, S); 2367 2368 return false; 2369} 2370 2371 2372void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2373 ObjCMethodDecl *oldMethod) { 2374 2375 // Merge the attributes, including deprecated/unavailable 2376 mergeDeclAttributes(newMethod, oldMethod, /* mergeDeprecation */true); 2377 2378 // Merge attributes from the parameters. 2379 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(), 2380 oe = oldMethod->param_end(); 2381 for (ObjCMethodDecl::param_iterator 2382 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2383 ni != ne && oi != oe; ++ni, ++oi) 2384 mergeParamDeclAttributes(*ni, *oi, Context); 2385 2386 CheckObjCMethodOverride(newMethod, oldMethod, true); 2387} 2388 2389/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2390/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2391/// emitting diagnostics as appropriate. 2392/// 2393/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2394/// to here in AddInitializerToDecl. We can't check them before the initializer 2395/// is attached. 2396void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2397 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2398 return; 2399 2400 QualType MergedT; 2401 if (getLangOpts().CPlusPlus) { 2402 AutoType *AT = New->getType()->getContainedAutoType(); 2403 if (AT && !AT->isDeduced()) { 2404 // We don't know what the new type is until the initializer is attached. 2405 return; 2406 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2407 // These could still be something that needs exception specs checked. 2408 return MergeVarDeclExceptionSpecs(New, Old); 2409 } 2410 // C++ [basic.link]p10: 2411 // [...] the types specified by all declarations referring to a given 2412 // object or function shall be identical, except that declarations for an 2413 // array object can specify array types that differ by the presence or 2414 // absence of a major array bound (8.3.4). 2415 else if (Old->getType()->isIncompleteArrayType() && 2416 New->getType()->isArrayType()) { 2417 CanQual<ArrayType> OldArray 2418 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2419 CanQual<ArrayType> NewArray 2420 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2421 if (OldArray->getElementType() == NewArray->getElementType()) 2422 MergedT = New->getType(); 2423 } else if (Old->getType()->isArrayType() && 2424 New->getType()->isIncompleteArrayType()) { 2425 CanQual<ArrayType> OldArray 2426 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2427 CanQual<ArrayType> NewArray 2428 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2429 if (OldArray->getElementType() == NewArray->getElementType()) 2430 MergedT = Old->getType(); 2431 } else if (New->getType()->isObjCObjectPointerType() 2432 && Old->getType()->isObjCObjectPointerType()) { 2433 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2434 Old->getType()); 2435 } 2436 } else { 2437 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2438 } 2439 if (MergedT.isNull()) { 2440 Diag(New->getLocation(), diag::err_redefinition_different_type) 2441 << New->getDeclName(); 2442 Diag(Old->getLocation(), diag::note_previous_definition); 2443 return New->setInvalidDecl(); 2444 } 2445 New->setType(MergedT); 2446} 2447 2448/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2449/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2450/// situation, merging decls or emitting diagnostics as appropriate. 2451/// 2452/// Tentative definition rules (C99 6.9.2p2) are checked by 2453/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2454/// definitions here, since the initializer hasn't been attached. 2455/// 2456void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2457 // If the new decl is already invalid, don't do any other checking. 2458 if (New->isInvalidDecl()) 2459 return; 2460 2461 // Verify the old decl was also a variable. 2462 VarDecl *Old = 0; 2463 if (!Previous.isSingleResult() || 2464 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2465 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2466 << New->getDeclName(); 2467 Diag(Previous.getRepresentativeDecl()->getLocation(), 2468 diag::note_previous_definition); 2469 return New->setInvalidDecl(); 2470 } 2471 2472 // C++ [class.mem]p1: 2473 // A member shall not be declared twice in the member-specification [...] 2474 // 2475 // Here, we need only consider static data members. 2476 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2477 Diag(New->getLocation(), diag::err_duplicate_member) 2478 << New->getIdentifier(); 2479 Diag(Old->getLocation(), diag::note_previous_declaration); 2480 New->setInvalidDecl(); 2481 } 2482 2483 mergeDeclAttributes(New, Old); 2484 // Warn if an already-declared variable is made a weak_import in a subsequent 2485 // declaration 2486 if (New->getAttr<WeakImportAttr>() && 2487 Old->getStorageClass() == SC_None && 2488 !Old->getAttr<WeakImportAttr>()) { 2489 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2490 Diag(Old->getLocation(), diag::note_previous_definition); 2491 // Remove weak_import attribute on new declaration. 2492 New->dropAttr<WeakImportAttr>(); 2493 } 2494 2495 // Merge the types. 2496 MergeVarDeclTypes(New, Old); 2497 if (New->isInvalidDecl()) 2498 return; 2499 2500 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2501 if (New->getStorageClass() == SC_Static && 2502 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2503 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2504 Diag(Old->getLocation(), diag::note_previous_definition); 2505 return New->setInvalidDecl(); 2506 } 2507 // C99 6.2.2p4: 2508 // For an identifier declared with the storage-class specifier 2509 // extern in a scope in which a prior declaration of that 2510 // identifier is visible,23) if the prior declaration specifies 2511 // internal or external linkage, the linkage of the identifier at 2512 // the later declaration is the same as the linkage specified at 2513 // the prior declaration. If no prior declaration is visible, or 2514 // if the prior declaration specifies no linkage, then the 2515 // identifier has external linkage. 2516 if (New->hasExternalStorage() && Old->hasLinkage()) 2517 /* Okay */; 2518 else if (New->getStorageClass() != SC_Static && 2519 Old->getStorageClass() == SC_Static) { 2520 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2521 Diag(Old->getLocation(), diag::note_previous_definition); 2522 return New->setInvalidDecl(); 2523 } 2524 2525 // Check if extern is followed by non-extern and vice-versa. 2526 if (New->hasExternalStorage() && 2527 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2528 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2529 Diag(Old->getLocation(), diag::note_previous_definition); 2530 return New->setInvalidDecl(); 2531 } 2532 if (Old->hasExternalStorage() && 2533 !New->hasLinkage() && New->isLocalVarDecl()) { 2534 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2535 Diag(Old->getLocation(), diag::note_previous_definition); 2536 return New->setInvalidDecl(); 2537 } 2538 2539 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2540 2541 // FIXME: The test for external storage here seems wrong? We still 2542 // need to check for mismatches. 2543 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2544 // Don't complain about out-of-line definitions of static members. 2545 !(Old->getLexicalDeclContext()->isRecord() && 2546 !New->getLexicalDeclContext()->isRecord())) { 2547 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2548 Diag(Old->getLocation(), diag::note_previous_definition); 2549 return New->setInvalidDecl(); 2550 } 2551 2552 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2553 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2554 Diag(Old->getLocation(), diag::note_previous_definition); 2555 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2556 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2557 Diag(Old->getLocation(), diag::note_previous_definition); 2558 } 2559 2560 // C++ doesn't have tentative definitions, so go right ahead and check here. 2561 const VarDecl *Def; 2562 if (getLangOpts().CPlusPlus && 2563 New->isThisDeclarationADefinition() == VarDecl::Definition && 2564 (Def = Old->getDefinition())) { 2565 Diag(New->getLocation(), diag::err_redefinition) 2566 << New->getDeclName(); 2567 Diag(Def->getLocation(), diag::note_previous_definition); 2568 New->setInvalidDecl(); 2569 return; 2570 } 2571 // c99 6.2.2 P4. 2572 // For an identifier declared with the storage-class specifier extern in a 2573 // scope in which a prior declaration of that identifier is visible, if 2574 // the prior declaration specifies internal or external linkage, the linkage 2575 // of the identifier at the later declaration is the same as the linkage 2576 // specified at the prior declaration. 2577 // FIXME. revisit this code. 2578 if (New->hasExternalStorage() && 2579 Old->getLinkage() == InternalLinkage && 2580 New->getDeclContext() == Old->getDeclContext()) 2581 New->setStorageClass(Old->getStorageClass()); 2582 2583 // Keep a chain of previous declarations. 2584 New->setPreviousDeclaration(Old); 2585 2586 // Inherit access appropriately. 2587 New->setAccess(Old->getAccess()); 2588} 2589 2590/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2591/// no declarator (e.g. "struct foo;") is parsed. 2592Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2593 DeclSpec &DS) { 2594 return ParsedFreeStandingDeclSpec(S, AS, DS, MultiTemplateParamsArg()); 2595} 2596 2597/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2598/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2599/// parameters to cope with template friend declarations. 2600Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2601 DeclSpec &DS, 2602 MultiTemplateParamsArg TemplateParams) { 2603 Decl *TagD = 0; 2604 TagDecl *Tag = 0; 2605 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2606 DS.getTypeSpecType() == DeclSpec::TST_struct || 2607 DS.getTypeSpecType() == DeclSpec::TST_union || 2608 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2609 TagD = DS.getRepAsDecl(); 2610 2611 if (!TagD) // We probably had an error 2612 return 0; 2613 2614 // Note that the above type specs guarantee that the 2615 // type rep is a Decl, whereas in many of the others 2616 // it's a Type. 2617 if (isa<TagDecl>(TagD)) 2618 Tag = cast<TagDecl>(TagD); 2619 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2620 Tag = CTD->getTemplatedDecl(); 2621 } 2622 2623 if (Tag) { 2624 Tag->setFreeStanding(); 2625 if (Tag->isInvalidDecl()) 2626 return Tag; 2627 } 2628 2629 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2630 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2631 // or incomplete types shall not be restrict-qualified." 2632 if (TypeQuals & DeclSpec::TQ_restrict) 2633 Diag(DS.getRestrictSpecLoc(), 2634 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2635 << DS.getSourceRange(); 2636 } 2637 2638 if (DS.isConstexprSpecified()) { 2639 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2640 // and definitions of functions and variables. 2641 if (Tag) 2642 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2643 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2644 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2645 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2646 else 2647 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2648 // Don't emit warnings after this error. 2649 return TagD; 2650 } 2651 2652 if (DS.isFriendSpecified()) { 2653 // If we're dealing with a decl but not a TagDecl, assume that 2654 // whatever routines created it handled the friendship aspect. 2655 if (TagD && !Tag) 2656 return 0; 2657 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2658 } 2659 2660 // Track whether we warned about the fact that there aren't any 2661 // declarators. 2662 bool emittedWarning = false; 2663 2664 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2665 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2666 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2667 if (getLangOpts().CPlusPlus || 2668 Record->getDeclContext()->isRecord()) 2669 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2670 2671 Diag(DS.getLocStart(), diag::ext_no_declarators) 2672 << DS.getSourceRange(); 2673 emittedWarning = true; 2674 } 2675 } 2676 2677 // Check for Microsoft C extension: anonymous struct. 2678 if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus && 2679 CurContext->isRecord() && 2680 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2681 // Handle 2 kinds of anonymous struct: 2682 // struct STRUCT; 2683 // and 2684 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2685 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2686 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2687 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2688 DS.getRepAsType().get()->isStructureType())) { 2689 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct) 2690 << DS.getSourceRange(); 2691 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2692 } 2693 } 2694 2695 if (getLangOpts().CPlusPlus && 2696 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2697 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2698 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2699 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2700 Diag(Enum->getLocation(), diag::ext_no_declarators) 2701 << DS.getSourceRange(); 2702 emittedWarning = true; 2703 } 2704 2705 // Skip all the checks below if we have a type error. 2706 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2707 2708 if (!DS.isMissingDeclaratorOk()) { 2709 // Warn about typedefs of enums without names, since this is an 2710 // extension in both Microsoft and GNU. 2711 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2712 Tag && isa<EnumDecl>(Tag)) { 2713 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name) 2714 << DS.getSourceRange(); 2715 return Tag; 2716 } 2717 2718 Diag(DS.getLocStart(), diag::ext_no_declarators) 2719 << DS.getSourceRange(); 2720 emittedWarning = true; 2721 } 2722 2723 // We're going to complain about a bunch of spurious specifiers; 2724 // only do this if we're declaring a tag, because otherwise we 2725 // should be getting diag::ext_no_declarators. 2726 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2727 return TagD; 2728 2729 // Note that a linkage-specification sets a storage class, but 2730 // 'extern "C" struct foo;' is actually valid and not theoretically 2731 // useless. 2732 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2733 if (!DS.isExternInLinkageSpec()) 2734 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2735 << DeclSpec::getSpecifierName(scs); 2736 2737 if (DS.isThreadSpecified()) 2738 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2739 if (DS.getTypeQualifiers()) { 2740 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2741 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2742 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2743 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2744 // Restrict is covered above. 2745 } 2746 if (DS.isInlineSpecified()) 2747 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2748 if (DS.isVirtualSpecified()) 2749 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2750 if (DS.isExplicitSpecified()) 2751 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2752 2753 if (DS.isModulePrivateSpecified() && 2754 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2755 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2756 << Tag->getTagKind() 2757 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2758 2759 // Warn about ignored type attributes, for example: 2760 // __attribute__((aligned)) struct A; 2761 // Attributes should be placed after tag to apply to type declaration. 2762 if (!DS.getAttributes().empty()) { 2763 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2764 if (TypeSpecType == DeclSpec::TST_class || 2765 TypeSpecType == DeclSpec::TST_struct || 2766 TypeSpecType == DeclSpec::TST_union || 2767 TypeSpecType == DeclSpec::TST_enum) { 2768 AttributeList* attrs = DS.getAttributes().getList(); 2769 while (attrs) { 2770 Diag(attrs->getScopeLoc(), 2771 diag::warn_declspec_attribute_ignored) 2772 << attrs->getName() 2773 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2774 TypeSpecType == DeclSpec::TST_struct ? 1 : 2775 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2776 attrs = attrs->getNext(); 2777 } 2778 } 2779 } 2780 2781 ActOnDocumentableDecl(TagD); 2782 2783 return TagD; 2784} 2785 2786/// We are trying to inject an anonymous member into the given scope; 2787/// check if there's an existing declaration that can't be overloaded. 2788/// 2789/// \return true if this is a forbidden redeclaration 2790static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2791 Scope *S, 2792 DeclContext *Owner, 2793 DeclarationName Name, 2794 SourceLocation NameLoc, 2795 unsigned diagnostic) { 2796 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2797 Sema::ForRedeclaration); 2798 if (!SemaRef.LookupName(R, S)) return false; 2799 2800 if (R.getAsSingle<TagDecl>()) 2801 return false; 2802 2803 // Pick a representative declaration. 2804 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2805 assert(PrevDecl && "Expected a non-null Decl"); 2806 2807 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2808 return false; 2809 2810 SemaRef.Diag(NameLoc, diagnostic) << Name; 2811 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2812 2813 return true; 2814} 2815 2816/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2817/// anonymous struct or union AnonRecord into the owning context Owner 2818/// and scope S. This routine will be invoked just after we realize 2819/// that an unnamed union or struct is actually an anonymous union or 2820/// struct, e.g., 2821/// 2822/// @code 2823/// union { 2824/// int i; 2825/// float f; 2826/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2827/// // f into the surrounding scope.x 2828/// @endcode 2829/// 2830/// This routine is recursive, injecting the names of nested anonymous 2831/// structs/unions into the owning context and scope as well. 2832static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2833 DeclContext *Owner, 2834 RecordDecl *AnonRecord, 2835 AccessSpecifier AS, 2836 SmallVector<NamedDecl*, 2> &Chaining, 2837 bool MSAnonStruct) { 2838 unsigned diagKind 2839 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2840 : diag::err_anonymous_struct_member_redecl; 2841 2842 bool Invalid = false; 2843 2844 // Look every FieldDecl and IndirectFieldDecl with a name. 2845 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2846 DEnd = AnonRecord->decls_end(); 2847 D != DEnd; ++D) { 2848 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2849 cast<NamedDecl>(*D)->getDeclName()) { 2850 ValueDecl *VD = cast<ValueDecl>(*D); 2851 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2852 VD->getLocation(), diagKind)) { 2853 // C++ [class.union]p2: 2854 // The names of the members of an anonymous union shall be 2855 // distinct from the names of any other entity in the 2856 // scope in which the anonymous union is declared. 2857 Invalid = true; 2858 } else { 2859 // C++ [class.union]p2: 2860 // For the purpose of name lookup, after the anonymous union 2861 // definition, the members of the anonymous union are 2862 // considered to have been defined in the scope in which the 2863 // anonymous union is declared. 2864 unsigned OldChainingSize = Chaining.size(); 2865 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2866 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2867 PE = IF->chain_end(); PI != PE; ++PI) 2868 Chaining.push_back(*PI); 2869 else 2870 Chaining.push_back(VD); 2871 2872 assert(Chaining.size() >= 2); 2873 NamedDecl **NamedChain = 2874 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2875 for (unsigned i = 0; i < Chaining.size(); i++) 2876 NamedChain[i] = Chaining[i]; 2877 2878 IndirectFieldDecl* IndirectField = 2879 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2880 VD->getIdentifier(), VD->getType(), 2881 NamedChain, Chaining.size()); 2882 2883 IndirectField->setAccess(AS); 2884 IndirectField->setImplicit(); 2885 SemaRef.PushOnScopeChains(IndirectField, S); 2886 2887 // That includes picking up the appropriate access specifier. 2888 if (AS != AS_none) IndirectField->setAccess(AS); 2889 2890 Chaining.resize(OldChainingSize); 2891 } 2892 } 2893 } 2894 2895 return Invalid; 2896} 2897 2898/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2899/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2900/// illegal input values are mapped to SC_None. 2901static StorageClass 2902StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2903 switch (StorageClassSpec) { 2904 case DeclSpec::SCS_unspecified: return SC_None; 2905 case DeclSpec::SCS_extern: return SC_Extern; 2906 case DeclSpec::SCS_static: return SC_Static; 2907 case DeclSpec::SCS_auto: return SC_Auto; 2908 case DeclSpec::SCS_register: return SC_Register; 2909 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2910 // Illegal SCSs map to None: error reporting is up to the caller. 2911 case DeclSpec::SCS_mutable: // Fall through. 2912 case DeclSpec::SCS_typedef: return SC_None; 2913 } 2914 llvm_unreachable("unknown storage class specifier"); 2915} 2916 2917/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2918/// a StorageClass. Any error reporting is up to the caller: 2919/// illegal input values are mapped to SC_None. 2920static StorageClass 2921StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2922 switch (StorageClassSpec) { 2923 case DeclSpec::SCS_unspecified: return SC_None; 2924 case DeclSpec::SCS_extern: return SC_Extern; 2925 case DeclSpec::SCS_static: return SC_Static; 2926 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2927 // Illegal SCSs map to None: error reporting is up to the caller. 2928 case DeclSpec::SCS_auto: // Fall through. 2929 case DeclSpec::SCS_mutable: // Fall through. 2930 case DeclSpec::SCS_register: // Fall through. 2931 case DeclSpec::SCS_typedef: return SC_None; 2932 } 2933 llvm_unreachable("unknown storage class specifier"); 2934} 2935 2936/// BuildAnonymousStructOrUnion - Handle the declaration of an 2937/// anonymous structure or union. Anonymous unions are a C++ feature 2938/// (C++ [class.union]) and a C11 feature; anonymous structures 2939/// are a C11 feature and GNU C++ extension. 2940Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2941 AccessSpecifier AS, 2942 RecordDecl *Record) { 2943 DeclContext *Owner = Record->getDeclContext(); 2944 2945 // Diagnose whether this anonymous struct/union is an extension. 2946 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11) 2947 Diag(Record->getLocation(), diag::ext_anonymous_union); 2948 else if (!Record->isUnion() && getLangOpts().CPlusPlus) 2949 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2950 else if (!Record->isUnion() && !getLangOpts().C11) 2951 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2952 2953 // C and C++ require different kinds of checks for anonymous 2954 // structs/unions. 2955 bool Invalid = false; 2956 if (getLangOpts().CPlusPlus) { 2957 const char* PrevSpec = 0; 2958 unsigned DiagID; 2959 if (Record->isUnion()) { 2960 // C++ [class.union]p6: 2961 // Anonymous unions declared in a named namespace or in the 2962 // global namespace shall be declared static. 2963 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2964 (isa<TranslationUnitDecl>(Owner) || 2965 (isa<NamespaceDecl>(Owner) && 2966 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2967 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2968 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2969 2970 // Recover by adding 'static'. 2971 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2972 PrevSpec, DiagID); 2973 } 2974 // C++ [class.union]p6: 2975 // A storage class is not allowed in a declaration of an 2976 // anonymous union in a class scope. 2977 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2978 isa<RecordDecl>(Owner)) { 2979 Diag(DS.getStorageClassSpecLoc(), 2980 diag::err_anonymous_union_with_storage_spec) 2981 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2982 2983 // Recover by removing the storage specifier. 2984 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2985 SourceLocation(), 2986 PrevSpec, DiagID); 2987 } 2988 } 2989 2990 // Ignore const/volatile/restrict qualifiers. 2991 if (DS.getTypeQualifiers()) { 2992 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2993 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2994 << Record->isUnion() << 0 2995 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2996 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2997 Diag(DS.getVolatileSpecLoc(), 2998 diag::ext_anonymous_struct_union_qualified) 2999 << Record->isUnion() << 1 3000 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 3001 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 3002 Diag(DS.getRestrictSpecLoc(), 3003 diag::ext_anonymous_struct_union_qualified) 3004 << Record->isUnion() << 2 3005 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 3006 3007 DS.ClearTypeQualifiers(); 3008 } 3009 3010 // C++ [class.union]p2: 3011 // The member-specification of an anonymous union shall only 3012 // define non-static data members. [Note: nested types and 3013 // functions cannot be declared within an anonymous union. ] 3014 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 3015 MemEnd = Record->decls_end(); 3016 Mem != MemEnd; ++Mem) { 3017 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 3018 // C++ [class.union]p3: 3019 // An anonymous union shall not have private or protected 3020 // members (clause 11). 3021 assert(FD->getAccess() != AS_none); 3022 if (FD->getAccess() != AS_public) { 3023 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 3024 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 3025 Invalid = true; 3026 } 3027 3028 // C++ [class.union]p1 3029 // An object of a class with a non-trivial constructor, a non-trivial 3030 // copy constructor, a non-trivial destructor, or a non-trivial copy 3031 // assignment operator cannot be a member of a union, nor can an 3032 // array of such objects. 3033 if (CheckNontrivialField(FD)) 3034 Invalid = true; 3035 } else if ((*Mem)->isImplicit()) { 3036 // Any implicit members are fine. 3037 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 3038 // This is a type that showed up in an 3039 // elaborated-type-specifier inside the anonymous struct or 3040 // union, but which actually declares a type outside of the 3041 // anonymous struct or union. It's okay. 3042 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 3043 if (!MemRecord->isAnonymousStructOrUnion() && 3044 MemRecord->getDeclName()) { 3045 // Visual C++ allows type definition in anonymous struct or union. 3046 if (getLangOpts().MicrosoftExt) 3047 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 3048 << (int)Record->isUnion(); 3049 else { 3050 // This is a nested type declaration. 3051 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 3052 << (int)Record->isUnion(); 3053 Invalid = true; 3054 } 3055 } 3056 } else if (isa<AccessSpecDecl>(*Mem)) { 3057 // Any access specifier is fine. 3058 } else { 3059 // We have something that isn't a non-static data 3060 // member. Complain about it. 3061 unsigned DK = diag::err_anonymous_record_bad_member; 3062 if (isa<TypeDecl>(*Mem)) 3063 DK = diag::err_anonymous_record_with_type; 3064 else if (isa<FunctionDecl>(*Mem)) 3065 DK = diag::err_anonymous_record_with_function; 3066 else if (isa<VarDecl>(*Mem)) 3067 DK = diag::err_anonymous_record_with_static; 3068 3069 // Visual C++ allows type definition in anonymous struct or union. 3070 if (getLangOpts().MicrosoftExt && 3071 DK == diag::err_anonymous_record_with_type) 3072 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 3073 << (int)Record->isUnion(); 3074 else { 3075 Diag((*Mem)->getLocation(), DK) 3076 << (int)Record->isUnion(); 3077 Invalid = true; 3078 } 3079 } 3080 } 3081 } 3082 3083 if (!Record->isUnion() && !Owner->isRecord()) { 3084 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 3085 << (int)getLangOpts().CPlusPlus; 3086 Invalid = true; 3087 } 3088 3089 // Mock up a declarator. 3090 Declarator Dc(DS, Declarator::MemberContext); 3091 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 3092 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 3093 3094 // Create a declaration for this anonymous struct/union. 3095 NamedDecl *Anon = 0; 3096 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 3097 Anon = FieldDecl::Create(Context, OwningClass, 3098 DS.getLocStart(), 3099 Record->getLocation(), 3100 /*IdentifierInfo=*/0, 3101 Context.getTypeDeclType(Record), 3102 TInfo, 3103 /*BitWidth=*/0, /*Mutable=*/false, 3104 /*InitStyle=*/ICIS_NoInit); 3105 Anon->setAccess(AS); 3106 if (getLangOpts().CPlusPlus) 3107 FieldCollector->Add(cast<FieldDecl>(Anon)); 3108 } else { 3109 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 3110 assert(SCSpec != DeclSpec::SCS_typedef && 3111 "Parser allowed 'typedef' as storage class VarDecl."); 3112 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3113 if (SCSpec == DeclSpec::SCS_mutable) { 3114 // mutable can only appear on non-static class members, so it's always 3115 // an error here 3116 Diag(Record->getLocation(), diag::err_mutable_nonmember); 3117 Invalid = true; 3118 SC = SC_None; 3119 } 3120 SCSpec = DS.getStorageClassSpecAsWritten(); 3121 VarDecl::StorageClass SCAsWritten 3122 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3123 3124 Anon = VarDecl::Create(Context, Owner, 3125 DS.getLocStart(), 3126 Record->getLocation(), /*IdentifierInfo=*/0, 3127 Context.getTypeDeclType(Record), 3128 TInfo, SC, SCAsWritten); 3129 3130 // Default-initialize the implicit variable. This initialization will be 3131 // trivial in almost all cases, except if a union member has an in-class 3132 // initializer: 3133 // union { int n = 0; }; 3134 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 3135 } 3136 Anon->setImplicit(); 3137 3138 // Add the anonymous struct/union object to the current 3139 // context. We'll be referencing this object when we refer to one of 3140 // its members. 3141 Owner->addDecl(Anon); 3142 3143 // Inject the members of the anonymous struct/union into the owning 3144 // context and into the identifier resolver chain for name lookup 3145 // purposes. 3146 SmallVector<NamedDecl*, 2> Chain; 3147 Chain.push_back(Anon); 3148 3149 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 3150 Chain, false)) 3151 Invalid = true; 3152 3153 // Mark this as an anonymous struct/union type. Note that we do not 3154 // do this until after we have already checked and injected the 3155 // members of this anonymous struct/union type, because otherwise 3156 // the members could be injected twice: once by DeclContext when it 3157 // builds its lookup table, and once by 3158 // InjectAnonymousStructOrUnionMembers. 3159 Record->setAnonymousStructOrUnion(true); 3160 3161 if (Invalid) 3162 Anon->setInvalidDecl(); 3163 3164 return Anon; 3165} 3166 3167/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 3168/// Microsoft C anonymous structure. 3169/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 3170/// Example: 3171/// 3172/// struct A { int a; }; 3173/// struct B { struct A; int b; }; 3174/// 3175/// void foo() { 3176/// B var; 3177/// var.a = 3; 3178/// } 3179/// 3180Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 3181 RecordDecl *Record) { 3182 3183 // If there is no Record, get the record via the typedef. 3184 if (!Record) 3185 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 3186 3187 // Mock up a declarator. 3188 Declarator Dc(DS, Declarator::TypeNameContext); 3189 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 3190 assert(TInfo && "couldn't build declarator info for anonymous struct"); 3191 3192 // Create a declaration for this anonymous struct. 3193 NamedDecl* Anon = FieldDecl::Create(Context, 3194 cast<RecordDecl>(CurContext), 3195 DS.getLocStart(), 3196 DS.getLocStart(), 3197 /*IdentifierInfo=*/0, 3198 Context.getTypeDeclType(Record), 3199 TInfo, 3200 /*BitWidth=*/0, /*Mutable=*/false, 3201 /*InitStyle=*/ICIS_NoInit); 3202 Anon->setImplicit(); 3203 3204 // Add the anonymous struct object to the current context. 3205 CurContext->addDecl(Anon); 3206 3207 // Inject the members of the anonymous struct into the current 3208 // context and into the identifier resolver chain for name lookup 3209 // purposes. 3210 SmallVector<NamedDecl*, 2> Chain; 3211 Chain.push_back(Anon); 3212 3213 RecordDecl *RecordDef = Record->getDefinition(); 3214 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 3215 RecordDef, AS_none, 3216 Chain, true)) 3217 Anon->setInvalidDecl(); 3218 3219 return Anon; 3220} 3221 3222/// GetNameForDeclarator - Determine the full declaration name for the 3223/// given Declarator. 3224DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 3225 return GetNameFromUnqualifiedId(D.getName()); 3226} 3227 3228/// \brief Retrieves the declaration name from a parsed unqualified-id. 3229DeclarationNameInfo 3230Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 3231 DeclarationNameInfo NameInfo; 3232 NameInfo.setLoc(Name.StartLocation); 3233 3234 switch (Name.getKind()) { 3235 3236 case UnqualifiedId::IK_ImplicitSelfParam: 3237 case UnqualifiedId::IK_Identifier: 3238 NameInfo.setName(Name.Identifier); 3239 NameInfo.setLoc(Name.StartLocation); 3240 return NameInfo; 3241 3242 case UnqualifiedId::IK_OperatorFunctionId: 3243 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 3244 Name.OperatorFunctionId.Operator)); 3245 NameInfo.setLoc(Name.StartLocation); 3246 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 3247 = Name.OperatorFunctionId.SymbolLocations[0]; 3248 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 3249 = Name.EndLocation.getRawEncoding(); 3250 return NameInfo; 3251 3252 case UnqualifiedId::IK_LiteralOperatorId: 3253 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 3254 Name.Identifier)); 3255 NameInfo.setLoc(Name.StartLocation); 3256 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3257 return NameInfo; 3258 3259 case UnqualifiedId::IK_ConversionFunctionId: { 3260 TypeSourceInfo *TInfo; 3261 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3262 if (Ty.isNull()) 3263 return DeclarationNameInfo(); 3264 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3265 Context.getCanonicalType(Ty))); 3266 NameInfo.setLoc(Name.StartLocation); 3267 NameInfo.setNamedTypeInfo(TInfo); 3268 return NameInfo; 3269 } 3270 3271 case UnqualifiedId::IK_ConstructorName: { 3272 TypeSourceInfo *TInfo; 3273 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3274 if (Ty.isNull()) 3275 return DeclarationNameInfo(); 3276 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3277 Context.getCanonicalType(Ty))); 3278 NameInfo.setLoc(Name.StartLocation); 3279 NameInfo.setNamedTypeInfo(TInfo); 3280 return NameInfo; 3281 } 3282 3283 case UnqualifiedId::IK_ConstructorTemplateId: { 3284 // In well-formed code, we can only have a constructor 3285 // template-id that refers to the current context, so go there 3286 // to find the actual type being constructed. 3287 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3288 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3289 return DeclarationNameInfo(); 3290 3291 // Determine the type of the class being constructed. 3292 QualType CurClassType = Context.getTypeDeclType(CurClass); 3293 3294 // FIXME: Check two things: that the template-id names the same type as 3295 // CurClassType, and that the template-id does not occur when the name 3296 // was qualified. 3297 3298 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3299 Context.getCanonicalType(CurClassType))); 3300 NameInfo.setLoc(Name.StartLocation); 3301 // FIXME: should we retrieve TypeSourceInfo? 3302 NameInfo.setNamedTypeInfo(0); 3303 return NameInfo; 3304 } 3305 3306 case UnqualifiedId::IK_DestructorName: { 3307 TypeSourceInfo *TInfo; 3308 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3309 if (Ty.isNull()) 3310 return DeclarationNameInfo(); 3311 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3312 Context.getCanonicalType(Ty))); 3313 NameInfo.setLoc(Name.StartLocation); 3314 NameInfo.setNamedTypeInfo(TInfo); 3315 return NameInfo; 3316 } 3317 3318 case UnqualifiedId::IK_TemplateId: { 3319 TemplateName TName = Name.TemplateId->Template.get(); 3320 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3321 return Context.getNameForTemplate(TName, TNameLoc); 3322 } 3323 3324 } // switch (Name.getKind()) 3325 3326 llvm_unreachable("Unknown name kind"); 3327} 3328 3329static QualType getCoreType(QualType Ty) { 3330 do { 3331 if (Ty->isPointerType() || Ty->isReferenceType()) 3332 Ty = Ty->getPointeeType(); 3333 else if (Ty->isArrayType()) 3334 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3335 else 3336 return Ty.withoutLocalFastQualifiers(); 3337 } while (true); 3338} 3339 3340/// hasSimilarParameters - Determine whether the C++ functions Declaration 3341/// and Definition have "nearly" matching parameters. This heuristic is 3342/// used to improve diagnostics in the case where an out-of-line function 3343/// definition doesn't match any declaration within the class or namespace. 3344/// Also sets Params to the list of indices to the parameters that differ 3345/// between the declaration and the definition. If hasSimilarParameters 3346/// returns true and Params is empty, then all of the parameters match. 3347static bool hasSimilarParameters(ASTContext &Context, 3348 FunctionDecl *Declaration, 3349 FunctionDecl *Definition, 3350 llvm::SmallVectorImpl<unsigned> &Params) { 3351 Params.clear(); 3352 if (Declaration->param_size() != Definition->param_size()) 3353 return false; 3354 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3355 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3356 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3357 3358 // The parameter types are identical 3359 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3360 continue; 3361 3362 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3363 QualType DefParamBaseTy = getCoreType(DefParamTy); 3364 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3365 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3366 3367 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3368 (DeclTyName && DeclTyName == DefTyName)) 3369 Params.push_back(Idx); 3370 else // The two parameters aren't even close 3371 return false; 3372 } 3373 3374 return true; 3375} 3376 3377/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3378/// declarator needs to be rebuilt in the current instantiation. 3379/// Any bits of declarator which appear before the name are valid for 3380/// consideration here. That's specifically the type in the decl spec 3381/// and the base type in any member-pointer chunks. 3382static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3383 DeclarationName Name) { 3384 // The types we specifically need to rebuild are: 3385 // - typenames, typeofs, and decltypes 3386 // - types which will become injected class names 3387 // Of course, we also need to rebuild any type referencing such a 3388 // type. It's safest to just say "dependent", but we call out a 3389 // few cases here. 3390 3391 DeclSpec &DS = D.getMutableDeclSpec(); 3392 switch (DS.getTypeSpecType()) { 3393 case DeclSpec::TST_typename: 3394 case DeclSpec::TST_typeofType: 3395 case DeclSpec::TST_decltype: 3396 case DeclSpec::TST_underlyingType: 3397 case DeclSpec::TST_atomic: { 3398 // Grab the type from the parser. 3399 TypeSourceInfo *TSI = 0; 3400 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3401 if (T.isNull() || !T->isDependentType()) break; 3402 3403 // Make sure there's a type source info. This isn't really much 3404 // of a waste; most dependent types should have type source info 3405 // attached already. 3406 if (!TSI) 3407 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3408 3409 // Rebuild the type in the current instantiation. 3410 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3411 if (!TSI) return true; 3412 3413 // Store the new type back in the decl spec. 3414 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3415 DS.UpdateTypeRep(LocType); 3416 break; 3417 } 3418 3419 case DeclSpec::TST_typeofExpr: { 3420 Expr *E = DS.getRepAsExpr(); 3421 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3422 if (Result.isInvalid()) return true; 3423 DS.UpdateExprRep(Result.get()); 3424 break; 3425 } 3426 3427 default: 3428 // Nothing to do for these decl specs. 3429 break; 3430 } 3431 3432 // It doesn't matter what order we do this in. 3433 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3434 DeclaratorChunk &Chunk = D.getTypeObject(I); 3435 3436 // The only type information in the declarator which can come 3437 // before the declaration name is the base type of a member 3438 // pointer. 3439 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3440 continue; 3441 3442 // Rebuild the scope specifier in-place. 3443 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3444 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3445 return true; 3446 } 3447 3448 return false; 3449} 3450 3451Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3452 D.setFunctionDefinitionKind(FDK_Declaration); 3453 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg()); 3454 3455 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3456 Dcl && Dcl->getDeclContext()->isFileContext()) 3457 Dcl->setTopLevelDeclInObjCContainer(); 3458 3459 return Dcl; 3460} 3461 3462/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3463/// If T is the name of a class, then each of the following shall have a 3464/// name different from T: 3465/// - every static data member of class T; 3466/// - every member function of class T 3467/// - every member of class T that is itself a type; 3468/// \returns true if the declaration name violates these rules. 3469bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3470 DeclarationNameInfo NameInfo) { 3471 DeclarationName Name = NameInfo.getName(); 3472 3473 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3474 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3475 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3476 return true; 3477 } 3478 3479 return false; 3480} 3481 3482/// \brief Diagnose a declaration whose declarator-id has the given 3483/// nested-name-specifier. 3484/// 3485/// \param SS The nested-name-specifier of the declarator-id. 3486/// 3487/// \param DC The declaration context to which the nested-name-specifier 3488/// resolves. 3489/// 3490/// \param Name The name of the entity being declared. 3491/// 3492/// \param Loc The location of the name of the entity being declared. 3493/// 3494/// \returns true if we cannot safely recover from this error, false otherwise. 3495bool Sema::diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC, 3496 DeclarationName Name, 3497 SourceLocation Loc) { 3498 DeclContext *Cur = CurContext; 3499 while (isa<LinkageSpecDecl>(Cur)) 3500 Cur = Cur->getParent(); 3501 3502 // C++ [dcl.meaning]p1: 3503 // A declarator-id shall not be qualified except for the definition 3504 // of a member function (9.3) or static data member (9.4) outside of 3505 // its class, the definition or explicit instantiation of a function 3506 // or variable member of a namespace outside of its namespace, or the 3507 // definition of an explicit specialization outside of its namespace, 3508 // or the declaration of a friend function that is a member of 3509 // another class or namespace (11.3). [...] 3510 3511 // The user provided a superfluous scope specifier that refers back to the 3512 // class or namespaces in which the entity is already declared. 3513 // 3514 // class X { 3515 // void X::f(); 3516 // }; 3517 if (Cur->Equals(DC)) { 3518 Diag(Loc, diag::warn_member_extra_qualification) 3519 << Name << FixItHint::CreateRemoval(SS.getRange()); 3520 SS.clear(); 3521 return false; 3522 } 3523 3524 // Check whether the qualifying scope encloses the scope of the original 3525 // declaration. 3526 if (!Cur->Encloses(DC)) { 3527 if (Cur->isRecord()) 3528 Diag(Loc, diag::err_member_qualification) 3529 << Name << SS.getRange(); 3530 else if (isa<TranslationUnitDecl>(DC)) 3531 Diag(Loc, diag::err_invalid_declarator_global_scope) 3532 << Name << SS.getRange(); 3533 else if (isa<FunctionDecl>(Cur)) 3534 Diag(Loc, diag::err_invalid_declarator_in_function) 3535 << Name << SS.getRange(); 3536 else 3537 Diag(Loc, diag::err_invalid_declarator_scope) 3538 << Name << cast<NamedDecl>(Cur) << cast<NamedDecl>(DC) << SS.getRange(); 3539 3540 return true; 3541 } 3542 3543 if (Cur->isRecord()) { 3544 // Cannot qualify members within a class. 3545 Diag(Loc, diag::err_member_qualification) 3546 << Name << SS.getRange(); 3547 SS.clear(); 3548 3549 // C++ constructors and destructors with incorrect scopes can break 3550 // our AST invariants by having the wrong underlying types. If 3551 // that's the case, then drop this declaration entirely. 3552 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3553 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3554 !Context.hasSameType(Name.getCXXNameType(), 3555 Context.getTypeDeclType(cast<CXXRecordDecl>(Cur)))) 3556 return true; 3557 3558 return false; 3559 } 3560 3561 // C++11 [dcl.meaning]p1: 3562 // [...] "The nested-name-specifier of the qualified declarator-id shall 3563 // not begin with a decltype-specifer" 3564 NestedNameSpecifierLoc SpecLoc(SS.getScopeRep(), SS.location_data()); 3565 while (SpecLoc.getPrefix()) 3566 SpecLoc = SpecLoc.getPrefix(); 3567 if (dyn_cast_or_null<DecltypeType>( 3568 SpecLoc.getNestedNameSpecifier()->getAsType())) 3569 Diag(Loc, diag::err_decltype_in_declarator) 3570 << SpecLoc.getTypeLoc().getSourceRange(); 3571 3572 return false; 3573} 3574 3575Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3576 MultiTemplateParamsArg TemplateParamLists) { 3577 // TODO: consider using NameInfo for diagnostic. 3578 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3579 DeclarationName Name = NameInfo.getName(); 3580 3581 // All of these full declarators require an identifier. If it doesn't have 3582 // one, the ParsedFreeStandingDeclSpec action should be used. 3583 if (!Name) { 3584 if (!D.isInvalidType()) // Reject this if we think it is valid. 3585 Diag(D.getDeclSpec().getLocStart(), 3586 diag::err_declarator_need_ident) 3587 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3588 return 0; 3589 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3590 return 0; 3591 3592 // The scope passed in may not be a decl scope. Zip up the scope tree until 3593 // we find one that is. 3594 while ((S->getFlags() & Scope::DeclScope) == 0 || 3595 (S->getFlags() & Scope::TemplateParamScope) != 0) 3596 S = S->getParent(); 3597 3598 DeclContext *DC = CurContext; 3599 if (D.getCXXScopeSpec().isInvalid()) 3600 D.setInvalidType(); 3601 else if (D.getCXXScopeSpec().isSet()) { 3602 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3603 UPPC_DeclarationQualifier)) 3604 return 0; 3605 3606 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3607 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3608 if (!DC) { 3609 // If we could not compute the declaration context, it's because the 3610 // declaration context is dependent but does not refer to a class, 3611 // class template, or class template partial specialization. Complain 3612 // and return early, to avoid the coming semantic disaster. 3613 Diag(D.getIdentifierLoc(), 3614 diag::err_template_qualified_declarator_no_match) 3615 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3616 << D.getCXXScopeSpec().getRange(); 3617 return 0; 3618 } 3619 bool IsDependentContext = DC->isDependentContext(); 3620 3621 if (!IsDependentContext && 3622 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3623 return 0; 3624 3625 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 3626 Diag(D.getIdentifierLoc(), 3627 diag::err_member_def_undefined_record) 3628 << Name << DC << D.getCXXScopeSpec().getRange(); 3629 D.setInvalidType(); 3630 } else if (!D.getDeclSpec().isFriendSpecified()) { 3631 if (diagnoseQualifiedDeclaration(D.getCXXScopeSpec(), DC, 3632 Name, D.getIdentifierLoc())) { 3633 if (DC->isRecord()) 3634 return 0; 3635 3636 D.setInvalidType(); 3637 } 3638 } 3639 3640 // Check whether we need to rebuild the type of the given 3641 // declaration in the current instantiation. 3642 if (EnteringContext && IsDependentContext && 3643 TemplateParamLists.size() != 0) { 3644 ContextRAII SavedContext(*this, DC); 3645 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3646 D.setInvalidType(); 3647 } 3648 } 3649 3650 if (DiagnoseClassNameShadow(DC, NameInfo)) 3651 // If this is a typedef, we'll end up spewing multiple diagnostics. 3652 // Just return early; it's safer. 3653 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3654 return 0; 3655 3656 NamedDecl *New; 3657 3658 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3659 QualType R = TInfo->getType(); 3660 3661 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3662 UPPC_DeclarationType)) 3663 D.setInvalidType(); 3664 3665 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3666 ForRedeclaration); 3667 3668 // See if this is a redefinition of a variable in the same scope. 3669 if (!D.getCXXScopeSpec().isSet()) { 3670 bool IsLinkageLookup = false; 3671 3672 // If the declaration we're planning to build will be a function 3673 // or object with linkage, then look for another declaration with 3674 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3675 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3676 /* Do nothing*/; 3677 else if (R->isFunctionType()) { 3678 if (CurContext->isFunctionOrMethod() || 3679 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3680 IsLinkageLookup = true; 3681 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3682 IsLinkageLookup = true; 3683 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3684 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3685 IsLinkageLookup = true; 3686 3687 if (IsLinkageLookup) 3688 Previous.clear(LookupRedeclarationWithLinkage); 3689 3690 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3691 } else { // Something like "int foo::x;" 3692 LookupQualifiedName(Previous, DC); 3693 3694 // C++ [dcl.meaning]p1: 3695 // When the declarator-id is qualified, the declaration shall refer to a 3696 // previously declared member of the class or namespace to which the 3697 // qualifier refers (or, in the case of a namespace, of an element of the 3698 // inline namespace set of that namespace (7.3.1)) or to a specialization 3699 // thereof; [...] 3700 // 3701 // Note that we already checked the context above, and that we do not have 3702 // enough information to make sure that Previous contains the declaration 3703 // we want to match. For example, given: 3704 // 3705 // class X { 3706 // void f(); 3707 // void f(float); 3708 // }; 3709 // 3710 // void X::f(int) { } // ill-formed 3711 // 3712 // In this case, Previous will point to the overload set 3713 // containing the two f's declared in X, but neither of them 3714 // matches. 3715 3716 // C++ [dcl.meaning]p1: 3717 // [...] the member shall not merely have been introduced by a 3718 // using-declaration in the scope of the class or namespace nominated by 3719 // the nested-name-specifier of the declarator-id. 3720 RemoveUsingDecls(Previous); 3721 } 3722 3723 if (Previous.isSingleResult() && 3724 Previous.getFoundDecl()->isTemplateParameter()) { 3725 // Maybe we will complain about the shadowed template parameter. 3726 if (!D.isInvalidType()) 3727 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3728 Previous.getFoundDecl()); 3729 3730 // Just pretend that we didn't see the previous declaration. 3731 Previous.clear(); 3732 } 3733 3734 // In C++, the previous declaration we find might be a tag type 3735 // (class or enum). In this case, the new declaration will hide the 3736 // tag type. Note that this does does not apply if we're declaring a 3737 // typedef (C++ [dcl.typedef]p4). 3738 if (Previous.isSingleTagDecl() && 3739 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3740 Previous.clear(); 3741 3742 bool AddToScope = true; 3743 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3744 if (TemplateParamLists.size()) { 3745 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3746 return 0; 3747 } 3748 3749 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3750 } else if (R->isFunctionType()) { 3751 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3752 TemplateParamLists, 3753 AddToScope); 3754 } else { 3755 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3756 TemplateParamLists); 3757 } 3758 3759 if (New == 0) 3760 return 0; 3761 3762 // If this has an identifier and is not an invalid redeclaration or 3763 // function template specialization, add it to the scope stack. 3764 if (New->getDeclName() && AddToScope && 3765 !(D.isRedeclaration() && New->isInvalidDecl())) 3766 PushOnScopeChains(New, S); 3767 3768 return New; 3769} 3770 3771/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3772/// types into constant array types in certain situations which would otherwise 3773/// be errors (for GCC compatibility). 3774static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3775 ASTContext &Context, 3776 bool &SizeIsNegative, 3777 llvm::APSInt &Oversized) { 3778 // This method tries to turn a variable array into a constant 3779 // array even when the size isn't an ICE. This is necessary 3780 // for compatibility with code that depends on gcc's buggy 3781 // constant expression folding, like struct {char x[(int)(char*)2];} 3782 SizeIsNegative = false; 3783 Oversized = 0; 3784 3785 if (T->isDependentType()) 3786 return QualType(); 3787 3788 QualifierCollector Qs; 3789 const Type *Ty = Qs.strip(T); 3790 3791 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3792 QualType Pointee = PTy->getPointeeType(); 3793 QualType FixedType = 3794 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3795 Oversized); 3796 if (FixedType.isNull()) return FixedType; 3797 FixedType = Context.getPointerType(FixedType); 3798 return Qs.apply(Context, FixedType); 3799 } 3800 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3801 QualType Inner = PTy->getInnerType(); 3802 QualType FixedType = 3803 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3804 Oversized); 3805 if (FixedType.isNull()) return FixedType; 3806 FixedType = Context.getParenType(FixedType); 3807 return Qs.apply(Context, FixedType); 3808 } 3809 3810 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3811 if (!VLATy) 3812 return QualType(); 3813 // FIXME: We should probably handle this case 3814 if (VLATy->getElementType()->isVariablyModifiedType()) 3815 return QualType(); 3816 3817 llvm::APSInt Res; 3818 if (!VLATy->getSizeExpr() || 3819 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3820 return QualType(); 3821 3822 // Check whether the array size is negative. 3823 if (Res.isSigned() && Res.isNegative()) { 3824 SizeIsNegative = true; 3825 return QualType(); 3826 } 3827 3828 // Check whether the array is too large to be addressed. 3829 unsigned ActiveSizeBits 3830 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3831 Res); 3832 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3833 Oversized = Res; 3834 return QualType(); 3835 } 3836 3837 return Context.getConstantArrayType(VLATy->getElementType(), 3838 Res, ArrayType::Normal, 0); 3839} 3840 3841/// \brief Register the given locally-scoped external C declaration so 3842/// that it can be found later for redeclarations 3843void 3844Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3845 const LookupResult &Previous, 3846 Scope *S) { 3847 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3848 "Decl is not a locally-scoped decl!"); 3849 // Note that we have a locally-scoped external with this name. 3850 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3851 3852 if (!Previous.isSingleResult()) 3853 return; 3854 3855 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3856 3857 // If there was a previous declaration of this variable, it may be 3858 // in our identifier chain. Update the identifier chain with the new 3859 // declaration. 3860 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3861 // The previous declaration was found on the identifer resolver 3862 // chain, so remove it from its scope. 3863 3864 if (S->isDeclScope(PrevDecl)) { 3865 // Special case for redeclarations in the SAME scope. 3866 // Because this declaration is going to be added to the identifier chain 3867 // later, we should temporarily take it OFF the chain. 3868 IdResolver.RemoveDecl(ND); 3869 3870 } else { 3871 // Find the scope for the original declaration. 3872 while (S && !S->isDeclScope(PrevDecl)) 3873 S = S->getParent(); 3874 } 3875 3876 if (S) 3877 S->RemoveDecl(PrevDecl); 3878 } 3879} 3880 3881llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3882Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3883 if (ExternalSource) { 3884 // Load locally-scoped external decls from the external source. 3885 SmallVector<NamedDecl *, 4> Decls; 3886 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3887 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3888 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3889 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3890 if (Pos == LocallyScopedExternalDecls.end()) 3891 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3892 } 3893 } 3894 3895 return LocallyScopedExternalDecls.find(Name); 3896} 3897 3898/// \brief Diagnose function specifiers on a declaration of an identifier that 3899/// does not identify a function. 3900void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3901 // FIXME: We should probably indicate the identifier in question to avoid 3902 // confusion for constructs like "inline int a(), b;" 3903 if (D.getDeclSpec().isInlineSpecified()) 3904 Diag(D.getDeclSpec().getInlineSpecLoc(), 3905 diag::err_inline_non_function); 3906 3907 if (D.getDeclSpec().isVirtualSpecified()) 3908 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3909 diag::err_virtual_non_function); 3910 3911 if (D.getDeclSpec().isExplicitSpecified()) 3912 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3913 diag::err_explicit_non_function); 3914} 3915 3916NamedDecl* 3917Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3918 TypeSourceInfo *TInfo, LookupResult &Previous) { 3919 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3920 if (D.getCXXScopeSpec().isSet()) { 3921 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3922 << D.getCXXScopeSpec().getRange(); 3923 D.setInvalidType(); 3924 // Pretend we didn't see the scope specifier. 3925 DC = CurContext; 3926 Previous.clear(); 3927 } 3928 3929 if (getLangOpts().CPlusPlus) { 3930 // Check that there are no default arguments (C++ only). 3931 CheckExtraCXXDefaultArguments(D); 3932 } 3933 3934 DiagnoseFunctionSpecifiers(D); 3935 3936 if (D.getDeclSpec().isThreadSpecified()) 3937 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3938 if (D.getDeclSpec().isConstexprSpecified()) 3939 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3940 << 1; 3941 3942 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3943 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3944 << D.getName().getSourceRange(); 3945 return 0; 3946 } 3947 3948 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3949 if (!NewTD) return 0; 3950 3951 // Handle attributes prior to checking for duplicates in MergeVarDecl 3952 ProcessDeclAttributes(S, NewTD, D); 3953 3954 CheckTypedefForVariablyModifiedType(S, NewTD); 3955 3956 bool Redeclaration = D.isRedeclaration(); 3957 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3958 D.setRedeclaration(Redeclaration); 3959 return ND; 3960} 3961 3962void 3963Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3964 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3965 // then it shall have block scope. 3966 // Note that variably modified types must be fixed before merging the decl so 3967 // that redeclarations will match. 3968 QualType T = NewTD->getUnderlyingType(); 3969 if (T->isVariablyModifiedType()) { 3970 getCurFunction()->setHasBranchProtectedScope(); 3971 3972 if (S->getFnParent() == 0) { 3973 bool SizeIsNegative; 3974 llvm::APSInt Oversized; 3975 QualType FixedTy = 3976 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3977 Oversized); 3978 if (!FixedTy.isNull()) { 3979 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3980 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3981 } else { 3982 if (SizeIsNegative) 3983 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3984 else if (T->isVariableArrayType()) 3985 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3986 else if (Oversized.getBoolValue()) 3987 Diag(NewTD->getLocation(), diag::err_array_too_large) 3988 << Oversized.toString(10); 3989 else 3990 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3991 NewTD->setInvalidDecl(); 3992 } 3993 } 3994 } 3995} 3996 3997 3998/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3999/// declares a typedef-name, either using the 'typedef' type specifier or via 4000/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 4001NamedDecl* 4002Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 4003 LookupResult &Previous, bool &Redeclaration) { 4004 // Merge the decl with the existing one if appropriate. If the decl is 4005 // in an outer scope, it isn't the same thing. 4006 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 4007 /*ExplicitInstantiationOrSpecialization=*/false); 4008 if (!Previous.empty()) { 4009 Redeclaration = true; 4010 MergeTypedefNameDecl(NewTD, Previous); 4011 } 4012 4013 // If this is the C FILE type, notify the AST context. 4014 if (IdentifierInfo *II = NewTD->getIdentifier()) 4015 if (!NewTD->isInvalidDecl() && 4016 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 4017 if (II->isStr("FILE")) 4018 Context.setFILEDecl(NewTD); 4019 else if (II->isStr("jmp_buf")) 4020 Context.setjmp_bufDecl(NewTD); 4021 else if (II->isStr("sigjmp_buf")) 4022 Context.setsigjmp_bufDecl(NewTD); 4023 else if (II->isStr("ucontext_t")) 4024 Context.setucontext_tDecl(NewTD); 4025 } 4026 4027 return NewTD; 4028} 4029 4030/// \brief Determines whether the given declaration is an out-of-scope 4031/// previous declaration. 4032/// 4033/// This routine should be invoked when name lookup has found a 4034/// previous declaration (PrevDecl) that is not in the scope where a 4035/// new declaration by the same name is being introduced. If the new 4036/// declaration occurs in a local scope, previous declarations with 4037/// linkage may still be considered previous declarations (C99 4038/// 6.2.2p4-5, C++ [basic.link]p6). 4039/// 4040/// \param PrevDecl the previous declaration found by name 4041/// lookup 4042/// 4043/// \param DC the context in which the new declaration is being 4044/// declared. 4045/// 4046/// \returns true if PrevDecl is an out-of-scope previous declaration 4047/// for a new delcaration with the same name. 4048static bool 4049isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 4050 ASTContext &Context) { 4051 if (!PrevDecl) 4052 return false; 4053 4054 if (!PrevDecl->hasLinkage()) 4055 return false; 4056 4057 if (Context.getLangOpts().CPlusPlus) { 4058 // C++ [basic.link]p6: 4059 // If there is a visible declaration of an entity with linkage 4060 // having the same name and type, ignoring entities declared 4061 // outside the innermost enclosing namespace scope, the block 4062 // scope declaration declares that same entity and receives the 4063 // linkage of the previous declaration. 4064 DeclContext *OuterContext = DC->getRedeclContext(); 4065 if (!OuterContext->isFunctionOrMethod()) 4066 // This rule only applies to block-scope declarations. 4067 return false; 4068 4069 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 4070 if (PrevOuterContext->isRecord()) 4071 // We found a member function: ignore it. 4072 return false; 4073 4074 // Find the innermost enclosing namespace for the new and 4075 // previous declarations. 4076 OuterContext = OuterContext->getEnclosingNamespaceContext(); 4077 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 4078 4079 // The previous declaration is in a different namespace, so it 4080 // isn't the same function. 4081 if (!OuterContext->Equals(PrevOuterContext)) 4082 return false; 4083 } 4084 4085 return true; 4086} 4087 4088static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 4089 CXXScopeSpec &SS = D.getCXXScopeSpec(); 4090 if (!SS.isSet()) return; 4091 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 4092} 4093 4094bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 4095 QualType type = decl->getType(); 4096 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 4097 if (lifetime == Qualifiers::OCL_Autoreleasing) { 4098 // Various kinds of declaration aren't allowed to be __autoreleasing. 4099 unsigned kind = -1U; 4100 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 4101 if (var->hasAttr<BlocksAttr>()) 4102 kind = 0; // __block 4103 else if (!var->hasLocalStorage()) 4104 kind = 1; // global 4105 } else if (isa<ObjCIvarDecl>(decl)) { 4106 kind = 3; // ivar 4107 } else if (isa<FieldDecl>(decl)) { 4108 kind = 2; // field 4109 } 4110 4111 if (kind != -1U) { 4112 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 4113 << kind; 4114 } 4115 } else if (lifetime == Qualifiers::OCL_None) { 4116 // Try to infer lifetime. 4117 if (!type->isObjCLifetimeType()) 4118 return false; 4119 4120 lifetime = type->getObjCARCImplicitLifetime(); 4121 type = Context.getLifetimeQualifiedType(type, lifetime); 4122 decl->setType(type); 4123 } 4124 4125 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 4126 // Thread-local variables cannot have lifetime. 4127 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 4128 var->isThreadSpecified()) { 4129 Diag(var->getLocation(), diag::err_arc_thread_ownership) 4130 << var->getType(); 4131 return true; 4132 } 4133 } 4134 4135 return false; 4136} 4137 4138NamedDecl* 4139Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4140 TypeSourceInfo *TInfo, LookupResult &Previous, 4141 MultiTemplateParamsArg TemplateParamLists) { 4142 QualType R = TInfo->getType(); 4143 DeclarationName Name = GetNameForDeclarator(D).getName(); 4144 4145 // Check that there are no default arguments (C++ only). 4146 if (getLangOpts().CPlusPlus) 4147 CheckExtraCXXDefaultArguments(D); 4148 4149 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 4150 assert(SCSpec != DeclSpec::SCS_typedef && 4151 "Parser allowed 'typedef' as storage class VarDecl."); 4152 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 4153 if (SCSpec == DeclSpec::SCS_mutable) { 4154 // mutable can only appear on non-static class members, so it's always 4155 // an error here 4156 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 4157 D.setInvalidType(); 4158 SC = SC_None; 4159 } 4160 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4161 VarDecl::StorageClass SCAsWritten 4162 = StorageClassSpecToVarDeclStorageClass(SCSpec); 4163 4164 IdentifierInfo *II = Name.getAsIdentifierInfo(); 4165 if (!II) { 4166 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 4167 << Name; 4168 return 0; 4169 } 4170 4171 DiagnoseFunctionSpecifiers(D); 4172 4173 if (!DC->isRecord() && S->getFnParent() == 0) { 4174 // C99 6.9p2: The storage-class specifiers auto and register shall not 4175 // appear in the declaration specifiers in an external declaration. 4176 if (SC == SC_Auto || SC == SC_Register) { 4177 4178 // If this is a register variable with an asm label specified, then this 4179 // is a GNU extension. 4180 if (SC == SC_Register && D.getAsmLabel()) 4181 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 4182 else 4183 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 4184 D.setInvalidType(); 4185 } 4186 } 4187 4188 if (getLangOpts().OpenCL) { 4189 // Set up the special work-group-local storage class for variables in the 4190 // OpenCL __local address space. 4191 if (R.getAddressSpace() == LangAS::opencl_local) 4192 SC = SC_OpenCLWorkGroupLocal; 4193 } 4194 4195 bool isExplicitSpecialization = false; 4196 VarDecl *NewVD; 4197 if (!getLangOpts().CPlusPlus) { 4198 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4199 D.getIdentifierLoc(), II, 4200 R, TInfo, SC, SCAsWritten); 4201 4202 if (D.isInvalidType()) 4203 NewVD->setInvalidDecl(); 4204 } else { 4205 if (DC->isRecord() && !CurContext->isRecord()) { 4206 // This is an out-of-line definition of a static data member. 4207 if (SC == SC_Static) { 4208 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4209 diag::err_static_out_of_line) 4210 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4211 } else if (SC == SC_None) 4212 SC = SC_Static; 4213 } 4214 if (SC == SC_Static && CurContext->isRecord()) { 4215 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 4216 if (RD->isLocalClass()) 4217 Diag(D.getIdentifierLoc(), 4218 diag::err_static_data_member_not_allowed_in_local_class) 4219 << Name << RD->getDeclName(); 4220 4221 // C++98 [class.union]p1: If a union contains a static data member, 4222 // the program is ill-formed. C++11 drops this restriction. 4223 if (RD->isUnion()) 4224 Diag(D.getIdentifierLoc(), 4225 getLangOpts().CPlusPlus0x 4226 ? diag::warn_cxx98_compat_static_data_member_in_union 4227 : diag::ext_static_data_member_in_union) << Name; 4228 // We conservatively disallow static data members in anonymous structs. 4229 else if (!RD->getDeclName()) 4230 Diag(D.getIdentifierLoc(), 4231 diag::err_static_data_member_not_allowed_in_anon_struct) 4232 << Name << RD->isUnion(); 4233 } 4234 } 4235 4236 // Match up the template parameter lists with the scope specifier, then 4237 // determine whether we have a template or a template specialization. 4238 isExplicitSpecialization = false; 4239 bool Invalid = false; 4240 if (TemplateParameterList *TemplateParams 4241 = MatchTemplateParametersToScopeSpecifier( 4242 D.getDeclSpec().getLocStart(), 4243 D.getIdentifierLoc(), 4244 D.getCXXScopeSpec(), 4245 TemplateParamLists.data(), 4246 TemplateParamLists.size(), 4247 /*never a friend*/ false, 4248 isExplicitSpecialization, 4249 Invalid)) { 4250 if (TemplateParams->size() > 0) { 4251 // There is no such thing as a variable template. 4252 Diag(D.getIdentifierLoc(), diag::err_template_variable) 4253 << II 4254 << SourceRange(TemplateParams->getTemplateLoc(), 4255 TemplateParams->getRAngleLoc()); 4256 return 0; 4257 } else { 4258 // There is an extraneous 'template<>' for this variable. Complain 4259 // about it, but allow the declaration of the variable. 4260 Diag(TemplateParams->getTemplateLoc(), 4261 diag::err_template_variable_noparams) 4262 << II 4263 << SourceRange(TemplateParams->getTemplateLoc(), 4264 TemplateParams->getRAngleLoc()); 4265 } 4266 } 4267 4268 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4269 D.getIdentifierLoc(), II, 4270 R, TInfo, SC, SCAsWritten); 4271 4272 // If this decl has an auto type in need of deduction, make a note of the 4273 // Decl so we can diagnose uses of it in its own initializer. 4274 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 4275 R->getContainedAutoType()) 4276 ParsingInitForAutoVars.insert(NewVD); 4277 4278 if (D.isInvalidType() || Invalid) 4279 NewVD->setInvalidDecl(); 4280 4281 SetNestedNameSpecifier(NewVD, D); 4282 4283 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 4284 NewVD->setTemplateParameterListsInfo(Context, 4285 TemplateParamLists.size(), 4286 TemplateParamLists.data()); 4287 } 4288 4289 if (D.getDeclSpec().isConstexprSpecified()) 4290 NewVD->setConstexpr(true); 4291 } 4292 4293 // Set the lexical context. If the declarator has a C++ scope specifier, the 4294 // lexical context will be different from the semantic context. 4295 NewVD->setLexicalDeclContext(CurContext); 4296 4297 if (D.getDeclSpec().isThreadSpecified()) { 4298 if (NewVD->hasLocalStorage()) 4299 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4300 else if (!Context.getTargetInfo().isTLSSupported()) 4301 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4302 else 4303 NewVD->setThreadSpecified(true); 4304 } 4305 4306 if (D.getDeclSpec().isModulePrivateSpecified()) { 4307 if (isExplicitSpecialization) 4308 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4309 << 2 4310 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4311 else if (NewVD->hasLocalStorage()) 4312 Diag(NewVD->getLocation(), diag::err_module_private_local) 4313 << 0 << NewVD->getDeclName() 4314 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4315 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4316 else 4317 NewVD->setModulePrivate(); 4318 } 4319 4320 // Handle attributes prior to checking for duplicates in MergeVarDecl 4321 ProcessDeclAttributes(S, NewVD, D); 4322 4323 if (getLangOpts().CUDA) { 4324 // CUDA B.2.5: "__shared__ and __constant__ variables have implied static 4325 // storage [duration]." 4326 if (SC == SC_None && S->getFnParent() != 0 && 4327 (NewVD->hasAttr<CUDASharedAttr>() || NewVD->hasAttr<CUDAConstantAttr>())) 4328 NewVD->setStorageClass(SC_Static); 4329 } 4330 4331 // In auto-retain/release, infer strong retension for variables of 4332 // retainable type. 4333 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4334 NewVD->setInvalidDecl(); 4335 4336 // Handle GNU asm-label extension (encoded as an attribute). 4337 if (Expr *E = (Expr*)D.getAsmLabel()) { 4338 // The parser guarantees this is a string. 4339 StringLiteral *SE = cast<StringLiteral>(E); 4340 StringRef Label = SE->getString(); 4341 if (S->getFnParent() != 0) { 4342 switch (SC) { 4343 case SC_None: 4344 case SC_Auto: 4345 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4346 break; 4347 case SC_Register: 4348 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4349 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4350 break; 4351 case SC_Static: 4352 case SC_Extern: 4353 case SC_PrivateExtern: 4354 case SC_OpenCLWorkGroupLocal: 4355 break; 4356 } 4357 } 4358 4359 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4360 Context, Label)); 4361 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 4362 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 4363 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier()); 4364 if (I != ExtnameUndeclaredIdentifiers.end()) { 4365 NewVD->addAttr(I->second); 4366 ExtnameUndeclaredIdentifiers.erase(I); 4367 } 4368 } 4369 4370 // Diagnose shadowed variables before filtering for scope. 4371 if (!D.getCXXScopeSpec().isSet()) 4372 CheckShadow(S, NewVD, Previous); 4373 4374 // Don't consider existing declarations that are in a different 4375 // scope and are out-of-semantic-context declarations (if the new 4376 // declaration has linkage). 4377 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4378 isExplicitSpecialization); 4379 4380 if (!getLangOpts().CPlusPlus) { 4381 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4382 } else { 4383 // Merge the decl with the existing one if appropriate. 4384 if (!Previous.empty()) { 4385 if (Previous.isSingleResult() && 4386 isa<FieldDecl>(Previous.getFoundDecl()) && 4387 D.getCXXScopeSpec().isSet()) { 4388 // The user tried to define a non-static data member 4389 // out-of-line (C++ [dcl.meaning]p1). 4390 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4391 << D.getCXXScopeSpec().getRange(); 4392 Previous.clear(); 4393 NewVD->setInvalidDecl(); 4394 } 4395 } else if (D.getCXXScopeSpec().isSet()) { 4396 // No previous declaration in the qualifying scope. 4397 Diag(D.getIdentifierLoc(), diag::err_no_member) 4398 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4399 << D.getCXXScopeSpec().getRange(); 4400 NewVD->setInvalidDecl(); 4401 } 4402 4403 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4404 4405 // This is an explicit specialization of a static data member. Check it. 4406 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4407 CheckMemberSpecialization(NewVD, Previous)) 4408 NewVD->setInvalidDecl(); 4409 } 4410 4411 // If this is a locally-scoped extern C variable, update the map of 4412 // such variables. 4413 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4414 !NewVD->isInvalidDecl()) 4415 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4416 4417 // If there's a #pragma GCC visibility in scope, and this isn't a class 4418 // member, set the visibility of this variable. 4419 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4420 AddPushedVisibilityAttribute(NewVD); 4421 4422 MarkUnusedFileScopedDecl(NewVD); 4423 4424 return NewVD; 4425} 4426 4427/// \brief Diagnose variable or built-in function shadowing. Implements 4428/// -Wshadow. 4429/// 4430/// This method is called whenever a VarDecl is added to a "useful" 4431/// scope. 4432/// 4433/// \param S the scope in which the shadowing name is being declared 4434/// \param R the lookup of the name 4435/// 4436void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4437 // Return if warning is ignored. 4438 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4439 DiagnosticsEngine::Ignored) 4440 return; 4441 4442 // Don't diagnose declarations at file scope. 4443 if (D->hasGlobalStorage()) 4444 return; 4445 4446 DeclContext *NewDC = D->getDeclContext(); 4447 4448 // Only diagnose if we're shadowing an unambiguous field or variable. 4449 if (R.getResultKind() != LookupResult::Found) 4450 return; 4451 4452 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4453 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4454 return; 4455 4456 // Fields are not shadowed by variables in C++ static methods. 4457 if (isa<FieldDecl>(ShadowedDecl)) 4458 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4459 if (MD->isStatic()) 4460 return; 4461 4462 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4463 if (shadowedVar->isExternC()) { 4464 // For shadowing external vars, make sure that we point to the global 4465 // declaration, not a locally scoped extern declaration. 4466 for (VarDecl::redecl_iterator 4467 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4468 I != E; ++I) 4469 if (I->isFileVarDecl()) { 4470 ShadowedDecl = *I; 4471 break; 4472 } 4473 } 4474 4475 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4476 4477 // Only warn about certain kinds of shadowing for class members. 4478 if (NewDC && NewDC->isRecord()) { 4479 // In particular, don't warn about shadowing non-class members. 4480 if (!OldDC->isRecord()) 4481 return; 4482 4483 // TODO: should we warn about static data members shadowing 4484 // static data members from base classes? 4485 4486 // TODO: don't diagnose for inaccessible shadowed members. 4487 // This is hard to do perfectly because we might friend the 4488 // shadowing context, but that's just a false negative. 4489 } 4490 4491 // Determine what kind of declaration we're shadowing. 4492 unsigned Kind; 4493 if (isa<RecordDecl>(OldDC)) { 4494 if (isa<FieldDecl>(ShadowedDecl)) 4495 Kind = 3; // field 4496 else 4497 Kind = 2; // static data member 4498 } else if (OldDC->isFileContext()) 4499 Kind = 1; // global 4500 else 4501 Kind = 0; // local 4502 4503 DeclarationName Name = R.getLookupName(); 4504 4505 // Emit warning and note. 4506 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4507 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4508} 4509 4510/// \brief Check -Wshadow without the advantage of a previous lookup. 4511void Sema::CheckShadow(Scope *S, VarDecl *D) { 4512 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4513 DiagnosticsEngine::Ignored) 4514 return; 4515 4516 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4517 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4518 LookupName(R, S); 4519 CheckShadow(S, D, R); 4520} 4521 4522/// \brief Perform semantic checking on a newly-created variable 4523/// declaration. 4524/// 4525/// This routine performs all of the type-checking required for a 4526/// variable declaration once it has been built. It is used both to 4527/// check variables after they have been parsed and their declarators 4528/// have been translated into a declaration, and to check variables 4529/// that have been instantiated from a template. 4530/// 4531/// Sets NewVD->isInvalidDecl() if an error was encountered. 4532/// 4533/// Returns true if the variable declaration is a redeclaration. 4534bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4535 LookupResult &Previous) { 4536 // If the decl is already known invalid, don't check it. 4537 if (NewVD->isInvalidDecl()) 4538 return false; 4539 4540 QualType T = NewVD->getType(); 4541 4542 if (T->isObjCObjectType()) { 4543 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4544 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4545 T = Context.getObjCObjectPointerType(T); 4546 NewVD->setType(T); 4547 } 4548 4549 // Emit an error if an address space was applied to decl with local storage. 4550 // This includes arrays of objects with address space qualifiers, but not 4551 // automatic variables that point to other address spaces. 4552 // ISO/IEC TR 18037 S5.1.2 4553 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4554 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4555 NewVD->setInvalidDecl(); 4556 return false; 4557 } 4558 4559 // OpenCL v1.2 s6.8 -- The static qualifier is valid only in program 4560 // scope. 4561 if ((getLangOpts().OpenCLVersion >= 120) 4562 && NewVD->isStaticLocal()) { 4563 Diag(NewVD->getLocation(), diag::err_static_function_scope); 4564 NewVD->setInvalidDecl(); 4565 return false; 4566 } 4567 4568 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4569 && !NewVD->hasAttr<BlocksAttr>()) { 4570 if (getLangOpts().getGC() != LangOptions::NonGC) 4571 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4572 else 4573 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4574 } 4575 4576 bool isVM = T->isVariablyModifiedType(); 4577 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4578 NewVD->hasAttr<BlocksAttr>()) 4579 getCurFunction()->setHasBranchProtectedScope(); 4580 4581 if ((isVM && NewVD->hasLinkage()) || 4582 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4583 bool SizeIsNegative; 4584 llvm::APSInt Oversized; 4585 QualType FixedTy = 4586 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4587 Oversized); 4588 4589 if (FixedTy.isNull() && T->isVariableArrayType()) { 4590 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4591 // FIXME: This won't give the correct result for 4592 // int a[10][n]; 4593 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4594 4595 if (NewVD->isFileVarDecl()) 4596 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4597 << SizeRange; 4598 else if (NewVD->getStorageClass() == SC_Static) 4599 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4600 << SizeRange; 4601 else 4602 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4603 << SizeRange; 4604 NewVD->setInvalidDecl(); 4605 return false; 4606 } 4607 4608 if (FixedTy.isNull()) { 4609 if (NewVD->isFileVarDecl()) 4610 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4611 else 4612 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4613 NewVD->setInvalidDecl(); 4614 return false; 4615 } 4616 4617 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4618 NewVD->setType(FixedTy); 4619 } 4620 4621 if (Previous.empty() && NewVD->isExternC()) { 4622 // Since we did not find anything by this name and we're declaring 4623 // an extern "C" variable, look for a non-visible extern "C" 4624 // declaration with the same name. 4625 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4626 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4627 if (Pos != LocallyScopedExternalDecls.end()) 4628 Previous.addDecl(Pos->second); 4629 } 4630 4631 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4632 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4633 << T; 4634 NewVD->setInvalidDecl(); 4635 return false; 4636 } 4637 4638 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4639 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4640 NewVD->setInvalidDecl(); 4641 return false; 4642 } 4643 4644 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4645 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4646 NewVD->setInvalidDecl(); 4647 return false; 4648 } 4649 4650 if (NewVD->isConstexpr() && !T->isDependentType() && 4651 RequireLiteralType(NewVD->getLocation(), T, 4652 diag::err_constexpr_var_non_literal)) { 4653 NewVD->setInvalidDecl(); 4654 return false; 4655 } 4656 4657 if (!Previous.empty()) { 4658 MergeVarDecl(NewVD, Previous); 4659 return true; 4660 } 4661 return false; 4662} 4663 4664/// \brief Data used with FindOverriddenMethod 4665struct FindOverriddenMethodData { 4666 Sema *S; 4667 CXXMethodDecl *Method; 4668}; 4669 4670/// \brief Member lookup function that determines whether a given C++ 4671/// method overrides a method in a base class, to be used with 4672/// CXXRecordDecl::lookupInBases(). 4673static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4674 CXXBasePath &Path, 4675 void *UserData) { 4676 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4677 4678 FindOverriddenMethodData *Data 4679 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4680 4681 DeclarationName Name = Data->Method->getDeclName(); 4682 4683 // FIXME: Do we care about other names here too? 4684 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4685 // We really want to find the base class destructor here. 4686 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4687 CanQualType CT = Data->S->Context.getCanonicalType(T); 4688 4689 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4690 } 4691 4692 for (Path.Decls = BaseRecord->lookup(Name); 4693 Path.Decls.first != Path.Decls.second; 4694 ++Path.Decls.first) { 4695 NamedDecl *D = *Path.Decls.first; 4696 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4697 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4698 return true; 4699 } 4700 } 4701 4702 return false; 4703} 4704 4705/// AddOverriddenMethods - See if a method overrides any in the base classes, 4706/// and if so, check that it's a valid override and remember it. 4707bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4708 // Look for virtual methods in base classes that this method might override. 4709 CXXBasePaths Paths; 4710 FindOverriddenMethodData Data; 4711 Data.Method = MD; 4712 Data.S = this; 4713 bool AddedAny = false; 4714 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4715 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4716 E = Paths.found_decls_end(); I != E; ++I) { 4717 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4718 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4719 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4720 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4721 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4722 AddedAny = true; 4723 } 4724 } 4725 } 4726 } 4727 4728 return AddedAny; 4729} 4730 4731namespace { 4732 // Struct for holding all of the extra arguments needed by 4733 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4734 struct ActOnFDArgs { 4735 Scope *S; 4736 Declarator &D; 4737 MultiTemplateParamsArg TemplateParamLists; 4738 bool AddToScope; 4739 }; 4740} 4741 4742namespace { 4743 4744// Callback to only accept typo corrections that have a non-zero edit distance. 4745// Also only accept corrections that have the same parent decl. 4746class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4747 public: 4748 DifferentNameValidatorCCC(ASTContext &Context, FunctionDecl *TypoFD, 4749 CXXRecordDecl *Parent) 4750 : Context(Context), OriginalFD(TypoFD), 4751 ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {} 4752 4753 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4754 if (candidate.getEditDistance() == 0) 4755 return false; 4756 4757 llvm::SmallVector<unsigned, 1> MismatchedParams; 4758 for (TypoCorrection::const_decl_iterator CDecl = candidate.begin(), 4759 CDeclEnd = candidate.end(); 4760 CDecl != CDeclEnd; ++CDecl) { 4761 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4762 4763 if (FD && !FD->hasBody() && 4764 hasSimilarParameters(Context, FD, OriginalFD, MismatchedParams)) { 4765 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 4766 CXXRecordDecl *Parent = MD->getParent(); 4767 if (Parent && Parent->getCanonicalDecl() == ExpectedParent) 4768 return true; 4769 } else if (!ExpectedParent) { 4770 return true; 4771 } 4772 } 4773 } 4774 4775 return false; 4776 } 4777 4778 private: 4779 ASTContext &Context; 4780 FunctionDecl *OriginalFD; 4781 CXXRecordDecl *ExpectedParent; 4782}; 4783 4784} 4785 4786/// \brief Generate diagnostics for an invalid function redeclaration. 4787/// 4788/// This routine handles generating the diagnostic messages for an invalid 4789/// function redeclaration, including finding possible similar declarations 4790/// or performing typo correction if there are no previous declarations with 4791/// the same name. 4792/// 4793/// Returns a NamedDecl iff typo correction was performed and substituting in 4794/// the new declaration name does not cause new errors. 4795static NamedDecl* DiagnoseInvalidRedeclaration( 4796 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4797 ActOnFDArgs &ExtraArgs) { 4798 NamedDecl *Result = NULL; 4799 DeclarationName Name = NewFD->getDeclName(); 4800 DeclContext *NewDC = NewFD->getDeclContext(); 4801 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4802 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4803 llvm::SmallVector<unsigned, 1> MismatchedParams; 4804 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4805 TypoCorrection Correction; 4806 bool isFriendDecl = (SemaRef.getLangOpts().CPlusPlus && 4807 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4808 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4809 : diag::err_member_def_does_not_match; 4810 4811 NewFD->setInvalidDecl(); 4812 SemaRef.LookupQualifiedName(Prev, NewDC); 4813 assert(!Prev.isAmbiguous() && 4814 "Cannot have an ambiguity in previous-declaration lookup"); 4815 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 4816 DifferentNameValidatorCCC Validator(SemaRef.Context, NewFD, 4817 MD ? MD->getParent() : 0); 4818 if (!Prev.empty()) { 4819 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4820 Func != FuncEnd; ++Func) { 4821 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4822 if (FD && 4823 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4824 // Add 1 to the index so that 0 can mean the mismatch didn't 4825 // involve a parameter 4826 unsigned ParamNum = 4827 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4828 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4829 } 4830 } 4831 // If the qualified name lookup yielded nothing, try typo correction 4832 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4833 Prev.getLookupKind(), 0, 0, 4834 Validator, NewDC))) { 4835 // Trap errors. 4836 Sema::SFINAETrap Trap(SemaRef); 4837 4838 // Set up everything for the call to ActOnFunctionDeclarator 4839 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4840 ExtraArgs.D.getIdentifierLoc()); 4841 Previous.clear(); 4842 Previous.setLookupName(Correction.getCorrection()); 4843 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4844 CDeclEnd = Correction.end(); 4845 CDecl != CDeclEnd; ++CDecl) { 4846 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4847 if (FD && !FD->hasBody() && 4848 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4849 Previous.addDecl(FD); 4850 } 4851 } 4852 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4853 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4854 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4855 // eliminate the need for the parameter pack ExtraArgs. 4856 Result = SemaRef.ActOnFunctionDeclarator( 4857 ExtraArgs.S, ExtraArgs.D, 4858 Correction.getCorrectionDecl()->getDeclContext(), 4859 NewFD->getTypeSourceInfo(), Previous, ExtraArgs.TemplateParamLists, 4860 ExtraArgs.AddToScope); 4861 if (Trap.hasErrorOccurred()) { 4862 // Pretend the typo correction never occurred 4863 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4864 ExtraArgs.D.getIdentifierLoc()); 4865 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4866 Previous.clear(); 4867 Previous.setLookupName(Name); 4868 Result = NULL; 4869 } else { 4870 for (LookupResult::iterator Func = Previous.begin(), 4871 FuncEnd = Previous.end(); 4872 Func != FuncEnd; ++Func) { 4873 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4874 NearMatches.push_back(std::make_pair(FD, 0)); 4875 } 4876 } 4877 if (NearMatches.empty()) { 4878 // Ignore the correction if it didn't yield any close FunctionDecl matches 4879 Correction = TypoCorrection(); 4880 } else { 4881 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4882 : diag::err_member_def_does_not_match_suggest; 4883 } 4884 } 4885 4886 if (Correction) { 4887 SourceRange FixItLoc(NewFD->getLocation()); 4888 CXXScopeSpec &SS = ExtraArgs.D.getCXXScopeSpec(); 4889 if (Correction.getCorrectionSpecifier() && SS.isValid()) 4890 FixItLoc.setBegin(SS.getBeginLoc()); 4891 SemaRef.Diag(NewFD->getLocStart(), DiagMsg) 4892 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOpts()) 4893 << FixItHint::CreateReplacement( 4894 FixItLoc, Correction.getAsString(SemaRef.getLangOpts())); 4895 } else { 4896 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4897 << Name << NewDC << NewFD->getLocation(); 4898 } 4899 4900 bool NewFDisConst = false; 4901 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4902 NewFDisConst = NewMD->isConst(); 4903 4904 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4905 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4906 NearMatch != NearMatchEnd; ++NearMatch) { 4907 FunctionDecl *FD = NearMatch->first; 4908 bool FDisConst = false; 4909 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4910 FDisConst = MD->isConst(); 4911 4912 if (unsigned Idx = NearMatch->second) { 4913 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4914 SourceLocation Loc = FDParam->getTypeSpecStartLoc(); 4915 if (Loc.isInvalid()) Loc = FD->getLocation(); 4916 SemaRef.Diag(Loc, diag::note_member_def_close_param_match) 4917 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4918 } else if (Correction) { 4919 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4920 << Correction.getQuoted(SemaRef.getLangOpts()); 4921 } else if (FDisConst != NewFDisConst) { 4922 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4923 << NewFDisConst << FD->getSourceRange().getEnd(); 4924 } else 4925 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4926 } 4927 return Result; 4928} 4929 4930static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4931 Declarator &D) { 4932 switch (D.getDeclSpec().getStorageClassSpec()) { 4933 default: llvm_unreachable("Unknown storage class!"); 4934 case DeclSpec::SCS_auto: 4935 case DeclSpec::SCS_register: 4936 case DeclSpec::SCS_mutable: 4937 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4938 diag::err_typecheck_sclass_func); 4939 D.setInvalidType(); 4940 break; 4941 case DeclSpec::SCS_unspecified: break; 4942 case DeclSpec::SCS_extern: return SC_Extern; 4943 case DeclSpec::SCS_static: { 4944 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4945 // C99 6.7.1p5: 4946 // The declaration of an identifier for a function that has 4947 // block scope shall have no explicit storage-class specifier 4948 // other than extern 4949 // See also (C++ [dcl.stc]p4). 4950 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4951 diag::err_static_block_func); 4952 break; 4953 } else 4954 return SC_Static; 4955 } 4956 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4957 } 4958 4959 // No explicit storage class has already been returned 4960 return SC_None; 4961} 4962 4963static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4964 DeclContext *DC, QualType &R, 4965 TypeSourceInfo *TInfo, 4966 FunctionDecl::StorageClass SC, 4967 bool &IsVirtualOkay) { 4968 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4969 DeclarationName Name = NameInfo.getName(); 4970 4971 FunctionDecl *NewFD = 0; 4972 bool isInline = D.getDeclSpec().isInlineSpecified(); 4973 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4974 FunctionDecl::StorageClass SCAsWritten 4975 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4976 4977 if (!SemaRef.getLangOpts().CPlusPlus) { 4978 // Determine whether the function was written with a 4979 // prototype. This true when: 4980 // - there is a prototype in the declarator, or 4981 // - the type R of the function is some kind of typedef or other reference 4982 // to a type name (which eventually refers to a function type). 4983 bool HasPrototype = 4984 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4985 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4986 4987 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4988 D.getLocStart(), NameInfo, R, 4989 TInfo, SC, SCAsWritten, isInline, 4990 HasPrototype); 4991 if (D.isInvalidType()) 4992 NewFD->setInvalidDecl(); 4993 4994 // Set the lexical context. 4995 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4996 4997 return NewFD; 4998 } 4999 5000 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 5001 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 5002 5003 // Check that the return type is not an abstract class type. 5004 // For record types, this is done by the AbstractClassUsageDiagnoser once 5005 // the class has been completely parsed. 5006 if (!DC->isRecord() && 5007 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 5008 R->getAs<FunctionType>()->getResultType(), 5009 diag::err_abstract_type_in_decl, 5010 SemaRef.AbstractReturnType)) 5011 D.setInvalidType(); 5012 5013 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 5014 // This is a C++ constructor declaration. 5015 assert(DC->isRecord() && 5016 "Constructors can only be declared in a member context"); 5017 5018 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 5019 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 5020 D.getLocStart(), NameInfo, 5021 R, TInfo, isExplicit, isInline, 5022 /*isImplicitlyDeclared=*/false, 5023 isConstexpr); 5024 5025 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 5026 // This is a C++ destructor declaration. 5027 if (DC->isRecord()) { 5028 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 5029 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 5030 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 5031 SemaRef.Context, Record, 5032 D.getLocStart(), 5033 NameInfo, R, TInfo, isInline, 5034 /*isImplicitlyDeclared=*/false); 5035 5036 // If the class is complete, then we now create the implicit exception 5037 // specification. If the class is incomplete or dependent, we can't do 5038 // it yet. 5039 if (SemaRef.getLangOpts().CPlusPlus0x && !Record->isDependentType() && 5040 Record->getDefinition() && !Record->isBeingDefined() && 5041 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 5042 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 5043 } 5044 5045 IsVirtualOkay = true; 5046 return NewDD; 5047 5048 } else { 5049 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 5050 D.setInvalidType(); 5051 5052 // Create a FunctionDecl to satisfy the function definition parsing 5053 // code path. 5054 return FunctionDecl::Create(SemaRef.Context, DC, 5055 D.getLocStart(), 5056 D.getIdentifierLoc(), Name, R, TInfo, 5057 SC, SCAsWritten, isInline, 5058 /*hasPrototype=*/true, isConstexpr); 5059 } 5060 5061 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 5062 if (!DC->isRecord()) { 5063 SemaRef.Diag(D.getIdentifierLoc(), 5064 diag::err_conv_function_not_member); 5065 return 0; 5066 } 5067 5068 SemaRef.CheckConversionDeclarator(D, R, SC); 5069 IsVirtualOkay = true; 5070 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 5071 D.getLocStart(), NameInfo, 5072 R, TInfo, isInline, isExplicit, 5073 isConstexpr, SourceLocation()); 5074 5075 } else if (DC->isRecord()) { 5076 // If the name of the function is the same as the name of the record, 5077 // then this must be an invalid constructor that has a return type. 5078 // (The parser checks for a return type and makes the declarator a 5079 // constructor if it has no return type). 5080 if (Name.getAsIdentifierInfo() && 5081 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 5082 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 5083 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5084 << SourceRange(D.getIdentifierLoc()); 5085 return 0; 5086 } 5087 5088 bool isStatic = SC == SC_Static; 5089 5090 // [class.free]p1: 5091 // Any allocation function for a class T is a static member 5092 // (even if not explicitly declared static). 5093 if (Name.getCXXOverloadedOperator() == OO_New || 5094 Name.getCXXOverloadedOperator() == OO_Array_New) 5095 isStatic = true; 5096 5097 // [class.free]p6 Any deallocation function for a class X is a static member 5098 // (even if not explicitly declared static). 5099 if (Name.getCXXOverloadedOperator() == OO_Delete || 5100 Name.getCXXOverloadedOperator() == OO_Array_Delete) 5101 isStatic = true; 5102 5103 IsVirtualOkay = !isStatic; 5104 5105 // This is a C++ method declaration. 5106 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 5107 D.getLocStart(), NameInfo, R, 5108 TInfo, isStatic, SCAsWritten, isInline, 5109 isConstexpr, SourceLocation()); 5110 5111 } else { 5112 // Determine whether the function was written with a 5113 // prototype. This true when: 5114 // - we're in C++ (where every function has a prototype), 5115 return FunctionDecl::Create(SemaRef.Context, DC, 5116 D.getLocStart(), 5117 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 5118 true/*HasPrototype*/, isConstexpr); 5119 } 5120} 5121 5122NamedDecl* 5123Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 5124 TypeSourceInfo *TInfo, LookupResult &Previous, 5125 MultiTemplateParamsArg TemplateParamLists, 5126 bool &AddToScope) { 5127 QualType R = TInfo->getType(); 5128 5129 assert(R.getTypePtr()->isFunctionType()); 5130 5131 // TODO: consider using NameInfo for diagnostic. 5132 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 5133 DeclarationName Name = NameInfo.getName(); 5134 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 5135 5136 if (D.getDeclSpec().isThreadSpecified()) 5137 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5138 5139 // Do not allow returning a objc interface by-value. 5140 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 5141 Diag(D.getIdentifierLoc(), 5142 diag::err_object_cannot_be_passed_returned_by_value) << 0 5143 << R->getAs<FunctionType>()->getResultType() 5144 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 5145 5146 QualType T = R->getAs<FunctionType>()->getResultType(); 5147 T = Context.getObjCObjectPointerType(T); 5148 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 5149 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 5150 R = Context.getFunctionType(T, FPT->arg_type_begin(), 5151 FPT->getNumArgs(), EPI); 5152 } 5153 else if (isa<FunctionNoProtoType>(R)) 5154 R = Context.getFunctionNoProtoType(T); 5155 } 5156 5157 bool isFriend = false; 5158 FunctionTemplateDecl *FunctionTemplate = 0; 5159 bool isExplicitSpecialization = false; 5160 bool isFunctionTemplateSpecialization = false; 5161 5162 bool isDependentClassScopeExplicitSpecialization = false; 5163 bool HasExplicitTemplateArgs = false; 5164 TemplateArgumentListInfo TemplateArgs; 5165 5166 bool isVirtualOkay = false; 5167 5168 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 5169 isVirtualOkay); 5170 if (!NewFD) return 0; 5171 5172 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 5173 NewFD->setTopLevelDeclInObjCContainer(); 5174 5175 if (getLangOpts().CPlusPlus) { 5176 bool isInline = D.getDeclSpec().isInlineSpecified(); 5177 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5178 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 5179 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 5180 isFriend = D.getDeclSpec().isFriendSpecified(); 5181 if (isFriend && !isInline && D.isFunctionDefinition()) { 5182 // C++ [class.friend]p5 5183 // A function can be defined in a friend declaration of a 5184 // class . . . . Such a function is implicitly inline. 5185 NewFD->setImplicitlyInline(); 5186 } 5187 5188 SetNestedNameSpecifier(NewFD, D); 5189 isExplicitSpecialization = false; 5190 isFunctionTemplateSpecialization = false; 5191 if (D.isInvalidType()) 5192 NewFD->setInvalidDecl(); 5193 5194 // Set the lexical context. If the declarator has a C++ 5195 // scope specifier, or is the object of a friend declaration, the 5196 // lexical context will be different from the semantic context. 5197 NewFD->setLexicalDeclContext(CurContext); 5198 5199 // Match up the template parameter lists with the scope specifier, then 5200 // determine whether we have a template or a template specialization. 5201 bool Invalid = false; 5202 if (TemplateParameterList *TemplateParams 5203 = MatchTemplateParametersToScopeSpecifier( 5204 D.getDeclSpec().getLocStart(), 5205 D.getIdentifierLoc(), 5206 D.getCXXScopeSpec(), 5207 TemplateParamLists.data(), 5208 TemplateParamLists.size(), 5209 isFriend, 5210 isExplicitSpecialization, 5211 Invalid)) { 5212 if (TemplateParams->size() > 0) { 5213 // This is a function template 5214 5215 // Check that we can declare a template here. 5216 if (CheckTemplateDeclScope(S, TemplateParams)) 5217 return 0; 5218 5219 // A destructor cannot be a template. 5220 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 5221 Diag(NewFD->getLocation(), diag::err_destructor_template); 5222 return 0; 5223 } 5224 5225 // If we're adding a template to a dependent context, we may need to 5226 // rebuilding some of the types used within the template parameter list, 5227 // now that we know what the current instantiation is. 5228 if (DC->isDependentContext()) { 5229 ContextRAII SavedContext(*this, DC); 5230 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 5231 Invalid = true; 5232 } 5233 5234 5235 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 5236 NewFD->getLocation(), 5237 Name, TemplateParams, 5238 NewFD); 5239 FunctionTemplate->setLexicalDeclContext(CurContext); 5240 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 5241 5242 // For source fidelity, store the other template param lists. 5243 if (TemplateParamLists.size() > 1) { 5244 NewFD->setTemplateParameterListsInfo(Context, 5245 TemplateParamLists.size() - 1, 5246 TemplateParamLists.data()); 5247 } 5248 } else { 5249 // This is a function template specialization. 5250 isFunctionTemplateSpecialization = true; 5251 // For source fidelity, store all the template param lists. 5252 NewFD->setTemplateParameterListsInfo(Context, 5253 TemplateParamLists.size(), 5254 TemplateParamLists.data()); 5255 5256 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 5257 if (isFriend) { 5258 // We want to remove the "template<>", found here. 5259 SourceRange RemoveRange = TemplateParams->getSourceRange(); 5260 5261 // If we remove the template<> and the name is not a 5262 // template-id, we're actually silently creating a problem: 5263 // the friend declaration will refer to an untemplated decl, 5264 // and clearly the user wants a template specialization. So 5265 // we need to insert '<>' after the name. 5266 SourceLocation InsertLoc; 5267 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 5268 InsertLoc = D.getName().getSourceRange().getEnd(); 5269 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 5270 } 5271 5272 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 5273 << Name << RemoveRange 5274 << FixItHint::CreateRemoval(RemoveRange) 5275 << FixItHint::CreateInsertion(InsertLoc, "<>"); 5276 } 5277 } 5278 } 5279 else { 5280 // All template param lists were matched against the scope specifier: 5281 // this is NOT (an explicit specialization of) a template. 5282 if (TemplateParamLists.size() > 0) 5283 // For source fidelity, store all the template param lists. 5284 NewFD->setTemplateParameterListsInfo(Context, 5285 TemplateParamLists.size(), 5286 TemplateParamLists.data()); 5287 } 5288 5289 if (Invalid) { 5290 NewFD->setInvalidDecl(); 5291 if (FunctionTemplate) 5292 FunctionTemplate->setInvalidDecl(); 5293 } 5294 5295 // C++ [dcl.fct.spec]p5: 5296 // The virtual specifier shall only be used in declarations of 5297 // nonstatic class member functions that appear within a 5298 // member-specification of a class declaration; see 10.3. 5299 // 5300 if (isVirtual && !NewFD->isInvalidDecl()) { 5301 if (!isVirtualOkay) { 5302 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5303 diag::err_virtual_non_function); 5304 } else if (!CurContext->isRecord()) { 5305 // 'virtual' was specified outside of the class. 5306 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5307 diag::err_virtual_out_of_class) 5308 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5309 } else if (NewFD->getDescribedFunctionTemplate()) { 5310 // C++ [temp.mem]p3: 5311 // A member function template shall not be virtual. 5312 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5313 diag::err_virtual_member_function_template) 5314 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5315 } else { 5316 // Okay: Add virtual to the method. 5317 NewFD->setVirtualAsWritten(true); 5318 } 5319 } 5320 5321 // C++ [dcl.fct.spec]p3: 5322 // The inline specifier shall not appear on a block scope function 5323 // declaration. 5324 if (isInline && !NewFD->isInvalidDecl()) { 5325 if (CurContext->isFunctionOrMethod()) { 5326 // 'inline' is not allowed on block scope function declaration. 5327 Diag(D.getDeclSpec().getInlineSpecLoc(), 5328 diag::err_inline_declaration_block_scope) << Name 5329 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5330 } 5331 } 5332 5333 // C++ [dcl.fct.spec]p6: 5334 // The explicit specifier shall be used only in the declaration of a 5335 // constructor or conversion function within its class definition; 5336 // see 12.3.1 and 12.3.2. 5337 if (isExplicit && !NewFD->isInvalidDecl()) { 5338 if (!CurContext->isRecord()) { 5339 // 'explicit' was specified outside of the class. 5340 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5341 diag::err_explicit_out_of_class) 5342 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5343 } else if (!isa<CXXConstructorDecl>(NewFD) && 5344 !isa<CXXConversionDecl>(NewFD)) { 5345 // 'explicit' was specified on a function that wasn't a constructor 5346 // or conversion function. 5347 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5348 diag::err_explicit_non_ctor_or_conv_function) 5349 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5350 } 5351 } 5352 5353 if (isConstexpr) { 5354 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5355 // are implicitly inline. 5356 NewFD->setImplicitlyInline(); 5357 5358 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5359 // be either constructors or to return a literal type. Therefore, 5360 // destructors cannot be declared constexpr. 5361 if (isa<CXXDestructorDecl>(NewFD)) 5362 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5363 } 5364 5365 // If __module_private__ was specified, mark the function accordingly. 5366 if (D.getDeclSpec().isModulePrivateSpecified()) { 5367 if (isFunctionTemplateSpecialization) { 5368 SourceLocation ModulePrivateLoc 5369 = D.getDeclSpec().getModulePrivateSpecLoc(); 5370 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5371 << 0 5372 << FixItHint::CreateRemoval(ModulePrivateLoc); 5373 } else { 5374 NewFD->setModulePrivate(); 5375 if (FunctionTemplate) 5376 FunctionTemplate->setModulePrivate(); 5377 } 5378 } 5379 5380 if (isFriend) { 5381 // For now, claim that the objects have no previous declaration. 5382 if (FunctionTemplate) { 5383 FunctionTemplate->setObjectOfFriendDecl(false); 5384 FunctionTemplate->setAccess(AS_public); 5385 } 5386 NewFD->setObjectOfFriendDecl(false); 5387 NewFD->setAccess(AS_public); 5388 } 5389 5390 // If a function is defined as defaulted or deleted, mark it as such now. 5391 switch (D.getFunctionDefinitionKind()) { 5392 case FDK_Declaration: 5393 case FDK_Definition: 5394 break; 5395 5396 case FDK_Defaulted: 5397 NewFD->setDefaulted(); 5398 break; 5399 5400 case FDK_Deleted: 5401 NewFD->setDeletedAsWritten(); 5402 break; 5403 } 5404 5405 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5406 D.isFunctionDefinition()) { 5407 // C++ [class.mfct]p2: 5408 // A member function may be defined (8.4) in its class definition, in 5409 // which case it is an inline member function (7.1.2) 5410 NewFD->setImplicitlyInline(); 5411 } 5412 5413 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5414 !CurContext->isRecord()) { 5415 // C++ [class.static]p1: 5416 // A data or function member of a class may be declared static 5417 // in a class definition, in which case it is a static member of 5418 // the class. 5419 5420 // Complain about the 'static' specifier if it's on an out-of-line 5421 // member function definition. 5422 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5423 diag::err_static_out_of_line) 5424 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5425 } 5426 } 5427 5428 // Filter out previous declarations that don't match the scope. 5429 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5430 isExplicitSpecialization || 5431 isFunctionTemplateSpecialization); 5432 5433 // Handle GNU asm-label extension (encoded as an attribute). 5434 if (Expr *E = (Expr*) D.getAsmLabel()) { 5435 // The parser guarantees this is a string. 5436 StringLiteral *SE = cast<StringLiteral>(E); 5437 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5438 SE->getString())); 5439 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 5440 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 5441 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); 5442 if (I != ExtnameUndeclaredIdentifiers.end()) { 5443 NewFD->addAttr(I->second); 5444 ExtnameUndeclaredIdentifiers.erase(I); 5445 } 5446 } 5447 5448 // Copy the parameter declarations from the declarator D to the function 5449 // declaration NewFD, if they are available. First scavenge them into Params. 5450 SmallVector<ParmVarDecl*, 16> Params; 5451 if (D.isFunctionDeclarator()) { 5452 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5453 5454 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5455 // function that takes no arguments, not a function that takes a 5456 // single void argument. 5457 // We let through "const void" here because Sema::GetTypeForDeclarator 5458 // already checks for that case. 5459 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5460 FTI.ArgInfo[0].Param && 5461 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5462 // Empty arg list, don't push any params. 5463 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5464 5465 // In C++, the empty parameter-type-list must be spelled "void"; a 5466 // typedef of void is not permitted. 5467 if (getLangOpts().CPlusPlus && 5468 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5469 bool IsTypeAlias = false; 5470 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5471 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5472 else if (const TemplateSpecializationType *TST = 5473 Param->getType()->getAs<TemplateSpecializationType>()) 5474 IsTypeAlias = TST->isTypeAlias(); 5475 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5476 << IsTypeAlias; 5477 } 5478 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5479 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5480 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5481 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5482 Param->setDeclContext(NewFD); 5483 Params.push_back(Param); 5484 5485 if (Param->isInvalidDecl()) 5486 NewFD->setInvalidDecl(); 5487 } 5488 } 5489 5490 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5491 // When we're declaring a function with a typedef, typeof, etc as in the 5492 // following example, we'll need to synthesize (unnamed) 5493 // parameters for use in the declaration. 5494 // 5495 // @code 5496 // typedef void fn(int); 5497 // fn f; 5498 // @endcode 5499 5500 // Synthesize a parameter for each argument type. 5501 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5502 AE = FT->arg_type_end(); AI != AE; ++AI) { 5503 ParmVarDecl *Param = 5504 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5505 Param->setScopeInfo(0, Params.size()); 5506 Params.push_back(Param); 5507 } 5508 } else { 5509 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5510 "Should not need args for typedef of non-prototype fn"); 5511 } 5512 5513 // Finally, we know we have the right number of parameters, install them. 5514 NewFD->setParams(Params); 5515 5516 // Find all anonymous symbols defined during the declaration of this function 5517 // and add to NewFD. This lets us track decls such 'enum Y' in: 5518 // 5519 // void f(enum Y {AA} x) {} 5520 // 5521 // which would otherwise incorrectly end up in the translation unit scope. 5522 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope); 5523 DeclsInPrototypeScope.clear(); 5524 5525 // Process the non-inheritable attributes on this declaration. 5526 ProcessDeclAttributes(S, NewFD, D, 5527 /*NonInheritable=*/true, /*Inheritable=*/false); 5528 5529 // Functions returning a variably modified type violate C99 6.7.5.2p2 5530 // because all functions have linkage. 5531 if (!NewFD->isInvalidDecl() && 5532 NewFD->getResultType()->isVariablyModifiedType()) { 5533 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5534 NewFD->setInvalidDecl(); 5535 } 5536 5537 // Handle attributes. 5538 ProcessDeclAttributes(S, NewFD, D, 5539 /*NonInheritable=*/false, /*Inheritable=*/true); 5540 5541 if (!getLangOpts().CPlusPlus) { 5542 // Perform semantic checking on the function declaration. 5543 bool isExplicitSpecialization=false; 5544 if (!NewFD->isInvalidDecl()) { 5545 if (NewFD->isMain()) 5546 CheckMain(NewFD, D.getDeclSpec()); 5547 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5548 isExplicitSpecialization)); 5549 } 5550 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5551 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5552 "previous declaration set still overloaded"); 5553 } else { 5554 // If the declarator is a template-id, translate the parser's template 5555 // argument list into our AST format. 5556 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5557 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5558 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5559 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5560 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(), 5561 TemplateId->NumArgs); 5562 translateTemplateArguments(TemplateArgsPtr, 5563 TemplateArgs); 5564 5565 HasExplicitTemplateArgs = true; 5566 5567 if (NewFD->isInvalidDecl()) { 5568 HasExplicitTemplateArgs = false; 5569 } else if (FunctionTemplate) { 5570 // Function template with explicit template arguments. 5571 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5572 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5573 5574 HasExplicitTemplateArgs = false; 5575 } else if (!isFunctionTemplateSpecialization && 5576 !D.getDeclSpec().isFriendSpecified()) { 5577 // We have encountered something that the user meant to be a 5578 // specialization (because it has explicitly-specified template 5579 // arguments) but that was not introduced with a "template<>" (or had 5580 // too few of them). 5581 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5582 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5583 << FixItHint::CreateInsertion( 5584 D.getDeclSpec().getLocStart(), 5585 "template<> "); 5586 isFunctionTemplateSpecialization = true; 5587 } else { 5588 // "friend void foo<>(int);" is an implicit specialization decl. 5589 isFunctionTemplateSpecialization = true; 5590 } 5591 } else if (isFriend && isFunctionTemplateSpecialization) { 5592 // This combination is only possible in a recovery case; the user 5593 // wrote something like: 5594 // template <> friend void foo(int); 5595 // which we're recovering from as if the user had written: 5596 // friend void foo<>(int); 5597 // Go ahead and fake up a template id. 5598 HasExplicitTemplateArgs = true; 5599 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5600 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5601 } 5602 5603 // If it's a friend (and only if it's a friend), it's possible 5604 // that either the specialized function type or the specialized 5605 // template is dependent, and therefore matching will fail. In 5606 // this case, don't check the specialization yet. 5607 bool InstantiationDependent = false; 5608 if (isFunctionTemplateSpecialization && isFriend && 5609 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5610 TemplateSpecializationType::anyDependentTemplateArguments( 5611 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5612 InstantiationDependent))) { 5613 assert(HasExplicitTemplateArgs && 5614 "friend function specialization without template args"); 5615 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5616 Previous)) 5617 NewFD->setInvalidDecl(); 5618 } else if (isFunctionTemplateSpecialization) { 5619 if (CurContext->isDependentContext() && CurContext->isRecord() 5620 && !isFriend) { 5621 isDependentClassScopeExplicitSpecialization = true; 5622 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ? 5623 diag::ext_function_specialization_in_class : 5624 diag::err_function_specialization_in_class) 5625 << NewFD->getDeclName(); 5626 } else if (CheckFunctionTemplateSpecialization(NewFD, 5627 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5628 Previous)) 5629 NewFD->setInvalidDecl(); 5630 5631 // C++ [dcl.stc]p1: 5632 // A storage-class-specifier shall not be specified in an explicit 5633 // specialization (14.7.3) 5634 if (SC != SC_None) { 5635 if (SC != NewFD->getStorageClass()) 5636 Diag(NewFD->getLocation(), 5637 diag::err_explicit_specialization_inconsistent_storage_class) 5638 << SC 5639 << FixItHint::CreateRemoval( 5640 D.getDeclSpec().getStorageClassSpecLoc()); 5641 5642 else 5643 Diag(NewFD->getLocation(), 5644 diag::ext_explicit_specialization_storage_class) 5645 << FixItHint::CreateRemoval( 5646 D.getDeclSpec().getStorageClassSpecLoc()); 5647 } 5648 5649 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5650 if (CheckMemberSpecialization(NewFD, Previous)) 5651 NewFD->setInvalidDecl(); 5652 } 5653 5654 // Perform semantic checking on the function declaration. 5655 if (!isDependentClassScopeExplicitSpecialization) { 5656 if (NewFD->isInvalidDecl()) { 5657 // If this is a class member, mark the class invalid immediately. 5658 // This avoids some consistency errors later. 5659 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5660 methodDecl->getParent()->setInvalidDecl(); 5661 } else { 5662 if (NewFD->isMain()) 5663 CheckMain(NewFD, D.getDeclSpec()); 5664 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5665 isExplicitSpecialization)); 5666 } 5667 } 5668 5669 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5670 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5671 "previous declaration set still overloaded"); 5672 5673 NamedDecl *PrincipalDecl = (FunctionTemplate 5674 ? cast<NamedDecl>(FunctionTemplate) 5675 : NewFD); 5676 5677 if (isFriend && D.isRedeclaration()) { 5678 AccessSpecifier Access = AS_public; 5679 if (!NewFD->isInvalidDecl()) 5680 Access = NewFD->getPreviousDecl()->getAccess(); 5681 5682 NewFD->setAccess(Access); 5683 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5684 5685 PrincipalDecl->setObjectOfFriendDecl(true); 5686 } 5687 5688 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5689 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5690 PrincipalDecl->setNonMemberOperator(); 5691 5692 // If we have a function template, check the template parameter 5693 // list. This will check and merge default template arguments. 5694 if (FunctionTemplate) { 5695 FunctionTemplateDecl *PrevTemplate = 5696 FunctionTemplate->getPreviousDecl(); 5697 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5698 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5699 D.getDeclSpec().isFriendSpecified() 5700 ? (D.isFunctionDefinition() 5701 ? TPC_FriendFunctionTemplateDefinition 5702 : TPC_FriendFunctionTemplate) 5703 : (D.getCXXScopeSpec().isSet() && 5704 DC && DC->isRecord() && 5705 DC->isDependentContext()) 5706 ? TPC_ClassTemplateMember 5707 : TPC_FunctionTemplate); 5708 } 5709 5710 if (NewFD->isInvalidDecl()) { 5711 // Ignore all the rest of this. 5712 } else if (!D.isRedeclaration()) { 5713 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5714 AddToScope }; 5715 // Fake up an access specifier if it's supposed to be a class member. 5716 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5717 NewFD->setAccess(AS_public); 5718 5719 // Qualified decls generally require a previous declaration. 5720 if (D.getCXXScopeSpec().isSet()) { 5721 // ...with the major exception of templated-scope or 5722 // dependent-scope friend declarations. 5723 5724 // TODO: we currently also suppress this check in dependent 5725 // contexts because (1) the parameter depth will be off when 5726 // matching friend templates and (2) we might actually be 5727 // selecting a friend based on a dependent factor. But there 5728 // are situations where these conditions don't apply and we 5729 // can actually do this check immediately. 5730 if (isFriend && 5731 (TemplateParamLists.size() || 5732 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5733 CurContext->isDependentContext())) { 5734 // ignore these 5735 } else { 5736 // The user tried to provide an out-of-line definition for a 5737 // function that is a member of a class or namespace, but there 5738 // was no such member function declared (C++ [class.mfct]p2, 5739 // C++ [namespace.memdef]p2). For example: 5740 // 5741 // class X { 5742 // void f() const; 5743 // }; 5744 // 5745 // void X::f() { } // ill-formed 5746 // 5747 // Complain about this problem, and attempt to suggest close 5748 // matches (e.g., those that differ only in cv-qualifiers and 5749 // whether the parameter types are references). 5750 5751 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5752 NewFD, 5753 ExtraArgs)) { 5754 AddToScope = ExtraArgs.AddToScope; 5755 return Result; 5756 } 5757 } 5758 5759 // Unqualified local friend declarations are required to resolve 5760 // to something. 5761 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5762 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5763 NewFD, 5764 ExtraArgs)) { 5765 AddToScope = ExtraArgs.AddToScope; 5766 return Result; 5767 } 5768 } 5769 5770 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5771 !isFriend && !isFunctionTemplateSpecialization && 5772 !isExplicitSpecialization) { 5773 // An out-of-line member function declaration must also be a 5774 // definition (C++ [dcl.meaning]p1). 5775 // Note that this is not the case for explicit specializations of 5776 // function templates or member functions of class templates, per 5777 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5778 // extension for compatibility with old SWIG code which likes to 5779 // generate them. 5780 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5781 << D.getCXXScopeSpec().getRange(); 5782 } 5783 } 5784 5785 AddKnownFunctionAttributes(NewFD); 5786 5787 if (NewFD->hasAttr<OverloadableAttr>() && 5788 !NewFD->getType()->getAs<FunctionProtoType>()) { 5789 Diag(NewFD->getLocation(), 5790 diag::err_attribute_overloadable_no_prototype) 5791 << NewFD; 5792 5793 // Turn this into a variadic function with no parameters. 5794 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5795 FunctionProtoType::ExtProtoInfo EPI; 5796 EPI.Variadic = true; 5797 EPI.ExtInfo = FT->getExtInfo(); 5798 5799 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5800 NewFD->setType(R); 5801 } 5802 5803 // If there's a #pragma GCC visibility in scope, and this isn't a class 5804 // member, set the visibility of this function. 5805 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5806 AddPushedVisibilityAttribute(NewFD); 5807 5808 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5809 // marking the function. 5810 AddCFAuditedAttribute(NewFD); 5811 5812 // If this is a locally-scoped extern C function, update the 5813 // map of such names. 5814 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5815 && !NewFD->isInvalidDecl()) 5816 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5817 5818 // Set this FunctionDecl's range up to the right paren. 5819 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5820 5821 if (getLangOpts().CPlusPlus) { 5822 if (FunctionTemplate) { 5823 if (NewFD->isInvalidDecl()) 5824 FunctionTemplate->setInvalidDecl(); 5825 return FunctionTemplate; 5826 } 5827 } 5828 5829 // OpenCL v1.2 s6.8 static is invalid for kernel functions. 5830 if ((getLangOpts().OpenCLVersion >= 120) 5831 && NewFD->hasAttr<OpenCLKernelAttr>() 5832 && (SC == SC_Static)) { 5833 Diag(D.getIdentifierLoc(), diag::err_static_kernel); 5834 D.setInvalidType(); 5835 } 5836 5837 MarkUnusedFileScopedDecl(NewFD); 5838 5839 if (getLangOpts().CUDA) 5840 if (IdentifierInfo *II = NewFD->getIdentifier()) 5841 if (!NewFD->isInvalidDecl() && 5842 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5843 if (II->isStr("cudaConfigureCall")) { 5844 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5845 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5846 5847 Context.setcudaConfigureCallDecl(NewFD); 5848 } 5849 } 5850 5851 // Here we have an function template explicit specialization at class scope. 5852 // The actually specialization will be postponed to template instatiation 5853 // time via the ClassScopeFunctionSpecializationDecl node. 5854 if (isDependentClassScopeExplicitSpecialization) { 5855 ClassScopeFunctionSpecializationDecl *NewSpec = 5856 ClassScopeFunctionSpecializationDecl::Create( 5857 Context, CurContext, SourceLocation(), 5858 cast<CXXMethodDecl>(NewFD), 5859 HasExplicitTemplateArgs, TemplateArgs); 5860 CurContext->addDecl(NewSpec); 5861 AddToScope = false; 5862 } 5863 5864 return NewFD; 5865} 5866 5867/// \brief Perform semantic checking of a new function declaration. 5868/// 5869/// Performs semantic analysis of the new function declaration 5870/// NewFD. This routine performs all semantic checking that does not 5871/// require the actual declarator involved in the declaration, and is 5872/// used both for the declaration of functions as they are parsed 5873/// (called via ActOnDeclarator) and for the declaration of functions 5874/// that have been instantiated via C++ template instantiation (called 5875/// via InstantiateDecl). 5876/// 5877/// \param IsExplicitSpecialization whether this new function declaration is 5878/// an explicit specialization of the previous declaration. 5879/// 5880/// This sets NewFD->isInvalidDecl() to true if there was an error. 5881/// 5882/// \returns true if the function declaration is a redeclaration. 5883bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5884 LookupResult &Previous, 5885 bool IsExplicitSpecialization) { 5886 assert(!NewFD->getResultType()->isVariablyModifiedType() 5887 && "Variably modified return types are not handled here"); 5888 5889 // Check for a previous declaration of this name. 5890 if (Previous.empty() && NewFD->isExternC()) { 5891 // Since we did not find anything by this name and we're declaring 5892 // an extern "C" function, look for a non-visible extern "C" 5893 // declaration with the same name. 5894 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5895 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5896 if (Pos != LocallyScopedExternalDecls.end()) 5897 Previous.addDecl(Pos->second); 5898 } 5899 5900 bool Redeclaration = false; 5901 5902 // Merge or overload the declaration with an existing declaration of 5903 // the same name, if appropriate. 5904 if (!Previous.empty()) { 5905 // Determine whether NewFD is an overload of PrevDecl or 5906 // a declaration that requires merging. If it's an overload, 5907 // there's no more work to do here; we'll just add the new 5908 // function to the scope. 5909 5910 NamedDecl *OldDecl = 0; 5911 if (!AllowOverloadingOfFunction(Previous, Context)) { 5912 Redeclaration = true; 5913 OldDecl = Previous.getFoundDecl(); 5914 } else { 5915 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5916 /*NewIsUsingDecl*/ false)) { 5917 case Ovl_Match: 5918 Redeclaration = true; 5919 break; 5920 5921 case Ovl_NonFunction: 5922 Redeclaration = true; 5923 break; 5924 5925 case Ovl_Overload: 5926 Redeclaration = false; 5927 break; 5928 } 5929 5930 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5931 // If a function name is overloadable in C, then every function 5932 // with that name must be marked "overloadable". 5933 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5934 << Redeclaration << NewFD; 5935 NamedDecl *OverloadedDecl = 0; 5936 if (Redeclaration) 5937 OverloadedDecl = OldDecl; 5938 else if (!Previous.empty()) 5939 OverloadedDecl = Previous.getRepresentativeDecl(); 5940 if (OverloadedDecl) 5941 Diag(OverloadedDecl->getLocation(), 5942 diag::note_attribute_overloadable_prev_overload); 5943 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5944 Context)); 5945 } 5946 } 5947 5948 if (Redeclaration) { 5949 // NewFD and OldDecl represent declarations that need to be 5950 // merged. 5951 if (MergeFunctionDecl(NewFD, OldDecl, S)) { 5952 NewFD->setInvalidDecl(); 5953 return Redeclaration; 5954 } 5955 5956 Previous.clear(); 5957 Previous.addDecl(OldDecl); 5958 5959 if (FunctionTemplateDecl *OldTemplateDecl 5960 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5961 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5962 FunctionTemplateDecl *NewTemplateDecl 5963 = NewFD->getDescribedFunctionTemplate(); 5964 assert(NewTemplateDecl && "Template/non-template mismatch"); 5965 if (CXXMethodDecl *Method 5966 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5967 Method->setAccess(OldTemplateDecl->getAccess()); 5968 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5969 } 5970 5971 // If this is an explicit specialization of a member that is a function 5972 // template, mark it as a member specialization. 5973 if (IsExplicitSpecialization && 5974 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5975 NewTemplateDecl->setMemberSpecialization(); 5976 assert(OldTemplateDecl->isMemberSpecialization()); 5977 } 5978 5979 } else { 5980 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5981 NewFD->setAccess(OldDecl->getAccess()); 5982 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5983 } 5984 } 5985 } 5986 5987 // Semantic checking for this function declaration (in isolation). 5988 if (getLangOpts().CPlusPlus) { 5989 // C++-specific checks. 5990 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5991 CheckConstructor(Constructor); 5992 } else if (CXXDestructorDecl *Destructor = 5993 dyn_cast<CXXDestructorDecl>(NewFD)) { 5994 CXXRecordDecl *Record = Destructor->getParent(); 5995 QualType ClassType = Context.getTypeDeclType(Record); 5996 5997 // FIXME: Shouldn't we be able to perform this check even when the class 5998 // type is dependent? Both gcc and edg can handle that. 5999 if (!ClassType->isDependentType()) { 6000 DeclarationName Name 6001 = Context.DeclarationNames.getCXXDestructorName( 6002 Context.getCanonicalType(ClassType)); 6003 if (NewFD->getDeclName() != Name) { 6004 Diag(NewFD->getLocation(), diag::err_destructor_name); 6005 NewFD->setInvalidDecl(); 6006 return Redeclaration; 6007 } 6008 } 6009 } else if (CXXConversionDecl *Conversion 6010 = dyn_cast<CXXConversionDecl>(NewFD)) { 6011 ActOnConversionDeclarator(Conversion); 6012 } 6013 6014 // Find any virtual functions that this function overrides. 6015 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 6016 if (!Method->isFunctionTemplateSpecialization() && 6017 !Method->getDescribedFunctionTemplate()) { 6018 if (AddOverriddenMethods(Method->getParent(), Method)) { 6019 // If the function was marked as "static", we have a problem. 6020 if (NewFD->getStorageClass() == SC_Static) { 6021 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 6022 << NewFD->getDeclName(); 6023 for (CXXMethodDecl::method_iterator 6024 Overridden = Method->begin_overridden_methods(), 6025 OverriddenEnd = Method->end_overridden_methods(); 6026 Overridden != OverriddenEnd; 6027 ++Overridden) { 6028 Diag((*Overridden)->getLocation(), 6029 diag::note_overridden_virtual_function); 6030 } 6031 } 6032 } 6033 } 6034 6035 if (Method->isStatic()) 6036 checkThisInStaticMemberFunctionType(Method); 6037 } 6038 6039 // Extra checking for C++ overloaded operators (C++ [over.oper]). 6040 if (NewFD->isOverloadedOperator() && 6041 CheckOverloadedOperatorDeclaration(NewFD)) { 6042 NewFD->setInvalidDecl(); 6043 return Redeclaration; 6044 } 6045 6046 // Extra checking for C++0x literal operators (C++0x [over.literal]). 6047 if (NewFD->getLiteralIdentifier() && 6048 CheckLiteralOperatorDeclaration(NewFD)) { 6049 NewFD->setInvalidDecl(); 6050 return Redeclaration; 6051 } 6052 6053 // In C++, check default arguments now that we have merged decls. Unless 6054 // the lexical context is the class, because in this case this is done 6055 // during delayed parsing anyway. 6056 if (!CurContext->isRecord()) 6057 CheckCXXDefaultArguments(NewFD); 6058 6059 // If this function declares a builtin function, check the type of this 6060 // declaration against the expected type for the builtin. 6061 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 6062 ASTContext::GetBuiltinTypeError Error; 6063 QualType T = Context.GetBuiltinType(BuiltinID, Error); 6064 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 6065 // The type of this function differs from the type of the builtin, 6066 // so forget about the builtin entirely. 6067 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 6068 } 6069 } 6070 6071 // If this function is declared as being extern "C", then check to see if 6072 // the function returns a UDT (class, struct, or union type) that is not C 6073 // compatible, and if it does, warn the user. 6074 if (NewFD->isExternC()) { 6075 QualType R = NewFD->getResultType(); 6076 if (R->isIncompleteType() && !R->isVoidType()) 6077 Diag(NewFD->getLocation(), diag::warn_return_value_udt_incomplete) 6078 << NewFD << R; 6079 else if (!R.isPODType(Context) && !R->isVoidType() && 6080 !R->isObjCObjectPointerType()) 6081 Diag(NewFD->getLocation(), diag::warn_return_value_udt) << NewFD << R; 6082 } 6083 } 6084 return Redeclaration; 6085} 6086 6087void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 6088 // C++11 [basic.start.main]p3: A program that declares main to be inline, 6089 // static or constexpr is ill-formed. 6090 // C99 6.7.4p4: In a hosted environment, the inline function specifier 6091 // shall not appear in a declaration of main. 6092 // static main is not an error under C99, but we should warn about it. 6093 if (FD->getStorageClass() == SC_Static) 6094 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus 6095 ? diag::err_static_main : diag::warn_static_main) 6096 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 6097 if (FD->isInlineSpecified()) 6098 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 6099 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 6100 if (FD->isConstexpr()) { 6101 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 6102 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 6103 FD->setConstexpr(false); 6104 } 6105 6106 QualType T = FD->getType(); 6107 assert(T->isFunctionType() && "function decl is not of function type"); 6108 const FunctionType* FT = T->castAs<FunctionType>(); 6109 6110 // All the standards say that main() should should return 'int'. 6111 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 6112 // In C and C++, main magically returns 0 if you fall off the end; 6113 // set the flag which tells us that. 6114 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6115 FD->setHasImplicitReturnZero(true); 6116 6117 // In C with GNU extensions we allow main() to have non-integer return 6118 // type, but we should warn about the extension, and we disable the 6119 // implicit-return-zero rule. 6120 } else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) { 6121 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); 6122 6123 // Otherwise, this is just a flat-out error. 6124 } else { 6125 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 6126 FD->setInvalidDecl(true); 6127 } 6128 6129 // Treat protoless main() as nullary. 6130 if (isa<FunctionNoProtoType>(FT)) return; 6131 6132 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 6133 unsigned nparams = FTP->getNumArgs(); 6134 assert(FD->getNumParams() == nparams); 6135 6136 bool HasExtraParameters = (nparams > 3); 6137 6138 // Darwin passes an undocumented fourth argument of type char**. If 6139 // other platforms start sprouting these, the logic below will start 6140 // getting shifty. 6141 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 6142 HasExtraParameters = false; 6143 6144 if (HasExtraParameters) { 6145 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 6146 FD->setInvalidDecl(true); 6147 nparams = 3; 6148 } 6149 6150 // FIXME: a lot of the following diagnostics would be improved 6151 // if we had some location information about types. 6152 6153 QualType CharPP = 6154 Context.getPointerType(Context.getPointerType(Context.CharTy)); 6155 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 6156 6157 for (unsigned i = 0; i < nparams; ++i) { 6158 QualType AT = FTP->getArgType(i); 6159 6160 bool mismatch = true; 6161 6162 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 6163 mismatch = false; 6164 else if (Expected[i] == CharPP) { 6165 // As an extension, the following forms are okay: 6166 // char const ** 6167 // char const * const * 6168 // char * const * 6169 6170 QualifierCollector qs; 6171 const PointerType* PT; 6172 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 6173 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 6174 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 6175 qs.removeConst(); 6176 mismatch = !qs.empty(); 6177 } 6178 } 6179 6180 if (mismatch) { 6181 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 6182 // TODO: suggest replacing given type with expected type 6183 FD->setInvalidDecl(true); 6184 } 6185 } 6186 6187 if (nparams == 1 && !FD->isInvalidDecl()) { 6188 Diag(FD->getLocation(), diag::warn_main_one_arg); 6189 } 6190 6191 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 6192 Diag(FD->getLocation(), diag::err_main_template_decl); 6193 FD->setInvalidDecl(); 6194 } 6195} 6196 6197bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 6198 // FIXME: Need strict checking. In C89, we need to check for 6199 // any assignment, increment, decrement, function-calls, or 6200 // commas outside of a sizeof. In C99, it's the same list, 6201 // except that the aforementioned are allowed in unevaluated 6202 // expressions. Everything else falls under the 6203 // "may accept other forms of constant expressions" exception. 6204 // (We never end up here for C++, so the constant expression 6205 // rules there don't matter.) 6206 if (Init->isConstantInitializer(Context, false)) 6207 return false; 6208 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 6209 << Init->getSourceRange(); 6210 return true; 6211} 6212 6213namespace { 6214 // Visits an initialization expression to see if OrigDecl is evaluated in 6215 // its own initialization and throws a warning if it does. 6216 class SelfReferenceChecker 6217 : public EvaluatedExprVisitor<SelfReferenceChecker> { 6218 Sema &S; 6219 Decl *OrigDecl; 6220 bool isRecordType; 6221 bool isPODType; 6222 bool isReferenceType; 6223 6224 public: 6225 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 6226 6227 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 6228 S(S), OrigDecl(OrigDecl) { 6229 isPODType = false; 6230 isRecordType = false; 6231 isReferenceType = false; 6232 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 6233 isPODType = VD->getType().isPODType(S.Context); 6234 isRecordType = VD->getType()->isRecordType(); 6235 isReferenceType = VD->getType()->isReferenceType(); 6236 } 6237 } 6238 6239 // Sometimes, the expression passed in lacks the casts that are used 6240 // to determine which DeclRefExpr's to check. Assume that the casts 6241 // are present and continue visiting the expression. 6242 void HandleExpr(Expr *E) { 6243 // Skip checking T a = a where T is not a record or reference type. 6244 // Doing so is a way to silence uninitialized warnings. 6245 if (isRecordType || isReferenceType) 6246 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 6247 HandleDeclRefExpr(DRE); 6248 6249 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 6250 HandleValue(CO->getTrueExpr()); 6251 HandleValue(CO->getFalseExpr()); 6252 } 6253 6254 Visit(E); 6255 } 6256 6257 // For most expressions, the cast is directly above the DeclRefExpr. 6258 // For conditional operators, the cast can be outside the conditional 6259 // operator if both expressions are DeclRefExpr's. 6260 void HandleValue(Expr *E) { 6261 E = E->IgnoreParenImpCasts(); 6262 if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) { 6263 HandleDeclRefExpr(DRE); 6264 return; 6265 } 6266 6267 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 6268 HandleValue(CO->getTrueExpr()); 6269 HandleValue(CO->getFalseExpr()); 6270 } 6271 } 6272 6273 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 6274 if ((!isRecordType && E->getCastKind() == CK_LValueToRValue) || 6275 (isRecordType && E->getCastKind() == CK_NoOp)) 6276 HandleValue(E->getSubExpr()); 6277 6278 Inherited::VisitImplicitCastExpr(E); 6279 } 6280 6281 void VisitMemberExpr(MemberExpr *E) { 6282 // Don't warn on arrays since they can be treated as pointers. 6283 if (E->getType()->canDecayToPointerType()) return; 6284 6285 ValueDecl *VD = E->getMemberDecl(); 6286 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(VD); 6287 if (isa<FieldDecl>(VD) || (MD && !MD->isStatic())) 6288 if (DeclRefExpr *DRE 6289 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 6290 HandleDeclRefExpr(DRE); 6291 return; 6292 } 6293 6294 Inherited::VisitMemberExpr(E); 6295 } 6296 6297 void VisitUnaryOperator(UnaryOperator *E) { 6298 // For POD record types, addresses of its own members are well-defined. 6299 if (E->getOpcode() == UO_AddrOf && isRecordType && isPODType && 6300 isa<MemberExpr>(E->getSubExpr()->IgnoreParens())) return; 6301 Inherited::VisitUnaryOperator(E); 6302 } 6303 6304 void VisitObjCMessageExpr(ObjCMessageExpr *E) { return; } 6305 6306 void HandleDeclRefExpr(DeclRefExpr *DRE) { 6307 Decl* ReferenceDecl = DRE->getDecl(); 6308 if (OrigDecl != ReferenceDecl) return; 6309 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 6310 Sema::NotForRedeclaration); 6311 unsigned diag = isReferenceType 6312 ? diag::warn_uninit_self_reference_in_reference_init 6313 : diag::warn_uninit_self_reference_in_init; 6314 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 6315 S.PDiag(diag) 6316 << Result.getLookupName() 6317 << OrigDecl->getLocation() 6318 << DRE->getSourceRange()); 6319 } 6320 }; 6321} 6322 6323/// CheckSelfReference - Warns if OrigDecl is used in expression E. 6324void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 6325 SelfReferenceChecker(*this, OrigDecl).HandleExpr(E); 6326} 6327 6328/// AddInitializerToDecl - Adds the initializer Init to the 6329/// declaration dcl. If DirectInit is true, this is C++ direct 6330/// initialization rather than copy initialization. 6331void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 6332 bool DirectInit, bool TypeMayContainAuto) { 6333 // If there is no declaration, there was an error parsing it. Just ignore 6334 // the initializer. 6335 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 6336 return; 6337 6338 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6339 // With declarators parsed the way they are, the parser cannot 6340 // distinguish between a normal initializer and a pure-specifier. 6341 // Thus this grotesque test. 6342 IntegerLiteral *IL; 6343 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6344 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6345 CheckPureMethod(Method, Init->getSourceRange()); 6346 else { 6347 Diag(Method->getLocation(), diag::err_member_function_initialization) 6348 << Method->getDeclName() << Init->getSourceRange(); 6349 Method->setInvalidDecl(); 6350 } 6351 return; 6352 } 6353 6354 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6355 if (!VDecl) { 6356 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6357 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6358 RealDecl->setInvalidDecl(); 6359 return; 6360 } 6361 6362 // Check for self-references within variable initializers. 6363 // Variables declared within a function/method body (except for references) 6364 // are handled by a dataflow analysis. 6365 // Record types initialized by initializer list are handled here. 6366 // Initialization by constructors are handled in TryConstructorInitialization. 6367 if ((!VDecl->hasLocalStorage() || VDecl->getType()->isReferenceType()) && 6368 (isa<InitListExpr>(Init) || !VDecl->getType()->isRecordType())) 6369 CheckSelfReference(RealDecl, Init); 6370 6371 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); 6372 6373 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6374 AutoType *Auto = 0; 6375 if (TypeMayContainAuto && 6376 (Auto = VDecl->getType()->getContainedAutoType()) && 6377 !Auto->isDeduced()) { 6378 Expr *DeduceInit = Init; 6379 // Initializer could be a C++ direct-initializer. Deduction only works if it 6380 // contains exactly one expression. 6381 if (CXXDirectInit) { 6382 if (CXXDirectInit->getNumExprs() == 0) { 6383 // It isn't possible to write this directly, but it is possible to 6384 // end up in this situation with "auto x(some_pack...);" 6385 Diag(CXXDirectInit->getLocStart(), 6386 diag::err_auto_var_init_no_expression) 6387 << VDecl->getDeclName() << VDecl->getType() 6388 << VDecl->getSourceRange(); 6389 RealDecl->setInvalidDecl(); 6390 return; 6391 } else if (CXXDirectInit->getNumExprs() > 1) { 6392 Diag(CXXDirectInit->getExpr(1)->getLocStart(), 6393 diag::err_auto_var_init_multiple_expressions) 6394 << VDecl->getDeclName() << VDecl->getType() 6395 << VDecl->getSourceRange(); 6396 RealDecl->setInvalidDecl(); 6397 return; 6398 } else { 6399 DeduceInit = CXXDirectInit->getExpr(0); 6400 } 6401 } 6402 TypeSourceInfo *DeducedType = 0; 6403 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) == 6404 DAR_Failed) 6405 DiagnoseAutoDeductionFailure(VDecl, DeduceInit); 6406 if (!DeducedType) { 6407 RealDecl->setInvalidDecl(); 6408 return; 6409 } 6410 VDecl->setTypeSourceInfo(DeducedType); 6411 VDecl->setType(DeducedType->getType()); 6412 VDecl->ClearLinkageCache(); 6413 6414 // In ARC, infer lifetime. 6415 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6416 VDecl->setInvalidDecl(); 6417 6418 // Warn if we deduced 'id'. 'auto' usually implies type-safety, but using 6419 // 'id' instead of a specific object type prevents most of our usual checks. 6420 // We only want to warn outside of template instantiations, though: 6421 // inside a template, the 'id' could have come from a parameter. 6422 if (ActiveTemplateInstantiations.empty() && 6423 DeducedType->getType()->isObjCIdType()) { 6424 SourceLocation Loc = DeducedType->getTypeLoc().getBeginLoc(); 6425 Diag(Loc, diag::warn_auto_var_is_id) 6426 << VDecl->getDeclName() << DeduceInit->getSourceRange(); 6427 } 6428 6429 // If this is a redeclaration, check that the type we just deduced matches 6430 // the previously declared type. 6431 if (VarDecl *Old = VDecl->getPreviousDecl()) 6432 MergeVarDeclTypes(VDecl, Old); 6433 } 6434 6435 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6436 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6437 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6438 VDecl->setInvalidDecl(); 6439 return; 6440 } 6441 6442 if (!VDecl->getType()->isDependentType()) { 6443 // A definition must end up with a complete type, which means it must be 6444 // complete with the restriction that an array type might be completed by 6445 // the initializer; note that later code assumes this restriction. 6446 QualType BaseDeclType = VDecl->getType(); 6447 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6448 BaseDeclType = Array->getElementType(); 6449 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6450 diag::err_typecheck_decl_incomplete_type)) { 6451 RealDecl->setInvalidDecl(); 6452 return; 6453 } 6454 6455 // The variable can not have an abstract class type. 6456 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6457 diag::err_abstract_type_in_decl, 6458 AbstractVariableType)) 6459 VDecl->setInvalidDecl(); 6460 } 6461 6462 const VarDecl *Def; 6463 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6464 Diag(VDecl->getLocation(), diag::err_redefinition) 6465 << VDecl->getDeclName(); 6466 Diag(Def->getLocation(), diag::note_previous_definition); 6467 VDecl->setInvalidDecl(); 6468 return; 6469 } 6470 6471 const VarDecl* PrevInit = 0; 6472 if (getLangOpts().CPlusPlus) { 6473 // C++ [class.static.data]p4 6474 // If a static data member is of const integral or const 6475 // enumeration type, its declaration in the class definition can 6476 // specify a constant-initializer which shall be an integral 6477 // constant expression (5.19). In that case, the member can appear 6478 // in integral constant expressions. The member shall still be 6479 // defined in a namespace scope if it is used in the program and the 6480 // namespace scope definition shall not contain an initializer. 6481 // 6482 // We already performed a redefinition check above, but for static 6483 // data members we also need to check whether there was an in-class 6484 // declaration with an initializer. 6485 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6486 Diag(VDecl->getLocation(), diag::err_redefinition) 6487 << VDecl->getDeclName(); 6488 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6489 return; 6490 } 6491 6492 if (VDecl->hasLocalStorage()) 6493 getCurFunction()->setHasBranchProtectedScope(); 6494 6495 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6496 VDecl->setInvalidDecl(); 6497 return; 6498 } 6499 } 6500 6501 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6502 // a kernel function cannot be initialized." 6503 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6504 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6505 VDecl->setInvalidDecl(); 6506 return; 6507 } 6508 6509 // Get the decls type and save a reference for later, since 6510 // CheckInitializerTypes may change it. 6511 QualType DclT = VDecl->getType(), SavT = DclT; 6512 6513 // Top-level message sends default to 'id' when we're in a debugger 6514 // and we are assigning it to a variable of 'id' type. 6515 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCIdType()) 6516 if (Init->getType() == Context.UnknownAnyTy && isa<ObjCMessageExpr>(Init)) { 6517 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); 6518 if (Result.isInvalid()) { 6519 VDecl->setInvalidDecl(); 6520 return; 6521 } 6522 Init = Result.take(); 6523 } 6524 6525 // Perform the initialization. 6526 if (!VDecl->isInvalidDecl()) { 6527 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6528 InitializationKind Kind 6529 = DirectInit ? 6530 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6531 Init->getLocStart(), 6532 Init->getLocEnd()) 6533 : InitializationKind::CreateDirectList( 6534 VDecl->getLocation()) 6535 : InitializationKind::CreateCopy(VDecl->getLocation(), 6536 Init->getLocStart()); 6537 6538 Expr **Args = &Init; 6539 unsigned NumArgs = 1; 6540 if (CXXDirectInit) { 6541 Args = CXXDirectInit->getExprs(); 6542 NumArgs = CXXDirectInit->getNumExprs(); 6543 } 6544 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs); 6545 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6546 MultiExprArg(Args, NumArgs), &DclT); 6547 if (Result.isInvalid()) { 6548 VDecl->setInvalidDecl(); 6549 return; 6550 } 6551 6552 Init = Result.takeAs<Expr>(); 6553 } 6554 6555 // If the type changed, it means we had an incomplete type that was 6556 // completed by the initializer. For example: 6557 // int ary[] = { 1, 3, 5 }; 6558 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6559 if (!VDecl->isInvalidDecl() && (DclT != SavT)) 6560 VDecl->setType(DclT); 6561 6562 // Check any implicit conversions within the expression. 6563 CheckImplicitConversions(Init, VDecl->getLocation()); 6564 6565 if (!VDecl->isInvalidDecl()) 6566 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6567 6568 Init = MaybeCreateExprWithCleanups(Init); 6569 // Attach the initializer to the decl. 6570 VDecl->setInit(Init); 6571 6572 if (VDecl->isLocalVarDecl()) { 6573 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6574 // static storage duration shall be constant expressions or string literals. 6575 // C++ does not have this restriction. 6576 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() && 6577 VDecl->getStorageClass() == SC_Static) 6578 CheckForConstantInitializer(Init, DclT); 6579 } else if (VDecl->isStaticDataMember() && 6580 VDecl->getLexicalDeclContext()->isRecord()) { 6581 // This is an in-class initialization for a static data member, e.g., 6582 // 6583 // struct S { 6584 // static const int value = 17; 6585 // }; 6586 6587 // C++ [class.mem]p4: 6588 // A member-declarator can contain a constant-initializer only 6589 // if it declares a static member (9.4) of const integral or 6590 // const enumeration type, see 9.4.2. 6591 // 6592 // C++11 [class.static.data]p3: 6593 // If a non-volatile const static data member is of integral or 6594 // enumeration type, its declaration in the class definition can 6595 // specify a brace-or-equal-initializer in which every initalizer-clause 6596 // that is an assignment-expression is a constant expression. A static 6597 // data member of literal type can be declared in the class definition 6598 // with the constexpr specifier; if so, its declaration shall specify a 6599 // brace-or-equal-initializer in which every initializer-clause that is 6600 // an assignment-expression is a constant expression. 6601 6602 // Do nothing on dependent types. 6603 if (DclT->isDependentType()) { 6604 6605 // Allow any 'static constexpr' members, whether or not they are of literal 6606 // type. We separately check that every constexpr variable is of literal 6607 // type. 6608 } else if (VDecl->isConstexpr()) { 6609 6610 // Require constness. 6611 } else if (!DclT.isConstQualified()) { 6612 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6613 << Init->getSourceRange(); 6614 VDecl->setInvalidDecl(); 6615 6616 // We allow integer constant expressions in all cases. 6617 } else if (DclT->isIntegralOrEnumerationType()) { 6618 // Check whether the expression is a constant expression. 6619 SourceLocation Loc; 6620 if (getLangOpts().CPlusPlus0x && DclT.isVolatileQualified()) 6621 // In C++11, a non-constexpr const static data member with an 6622 // in-class initializer cannot be volatile. 6623 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6624 else if (Init->isValueDependent()) 6625 ; // Nothing to check. 6626 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6627 ; // Ok, it's an ICE! 6628 else if (Init->isEvaluatable(Context)) { 6629 // If we can constant fold the initializer through heroics, accept it, 6630 // but report this as a use of an extension for -pedantic. 6631 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6632 << Init->getSourceRange(); 6633 } else { 6634 // Otherwise, this is some crazy unknown case. Report the issue at the 6635 // location provided by the isIntegerConstantExpr failed check. 6636 Diag(Loc, diag::err_in_class_initializer_non_constant) 6637 << Init->getSourceRange(); 6638 VDecl->setInvalidDecl(); 6639 } 6640 6641 // We allow foldable floating-point constants as an extension. 6642 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6643 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6644 << DclT << Init->getSourceRange(); 6645 if (getLangOpts().CPlusPlus0x) 6646 Diag(VDecl->getLocation(), 6647 diag::note_in_class_initializer_float_type_constexpr) 6648 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6649 6650 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6651 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6652 << Init->getSourceRange(); 6653 VDecl->setInvalidDecl(); 6654 } 6655 6656 // Suggest adding 'constexpr' in C++11 for literal types. 6657 } else if (getLangOpts().CPlusPlus0x && DclT->isLiteralType()) { 6658 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6659 << DclT << Init->getSourceRange() 6660 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6661 VDecl->setConstexpr(true); 6662 6663 } else { 6664 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6665 << DclT << Init->getSourceRange(); 6666 VDecl->setInvalidDecl(); 6667 } 6668 } else if (VDecl->isFileVarDecl()) { 6669 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6670 (!getLangOpts().CPlusPlus || 6671 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6672 Diag(VDecl->getLocation(), diag::warn_extern_init); 6673 6674 // C99 6.7.8p4. All file scoped initializers need to be constant. 6675 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) 6676 CheckForConstantInitializer(Init, DclT); 6677 } 6678 6679 // We will represent direct-initialization similarly to copy-initialization: 6680 // int x(1); -as-> int x = 1; 6681 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6682 // 6683 // Clients that want to distinguish between the two forms, can check for 6684 // direct initializer using VarDecl::getInitStyle(). 6685 // A major benefit is that clients that don't particularly care about which 6686 // exactly form was it (like the CodeGen) can handle both cases without 6687 // special case code. 6688 6689 // C++ 8.5p11: 6690 // The form of initialization (using parentheses or '=') is generally 6691 // insignificant, but does matter when the entity being initialized has a 6692 // class type. 6693 if (CXXDirectInit) { 6694 assert(DirectInit && "Call-style initializer must be direct init."); 6695 VDecl->setInitStyle(VarDecl::CallInit); 6696 } else if (DirectInit) { 6697 // This must be list-initialization. No other way is direct-initialization. 6698 VDecl->setInitStyle(VarDecl::ListInit); 6699 } 6700 6701 CheckCompleteVariableDeclaration(VDecl); 6702} 6703 6704/// ActOnInitializerError - Given that there was an error parsing an 6705/// initializer for the given declaration, try to return to some form 6706/// of sanity. 6707void Sema::ActOnInitializerError(Decl *D) { 6708 // Our main concern here is re-establishing invariants like "a 6709 // variable's type is either dependent or complete". 6710 if (!D || D->isInvalidDecl()) return; 6711 6712 VarDecl *VD = dyn_cast<VarDecl>(D); 6713 if (!VD) return; 6714 6715 // Auto types are meaningless if we can't make sense of the initializer. 6716 if (ParsingInitForAutoVars.count(D)) { 6717 D->setInvalidDecl(); 6718 return; 6719 } 6720 6721 QualType Ty = VD->getType(); 6722 if (Ty->isDependentType()) return; 6723 6724 // Require a complete type. 6725 if (RequireCompleteType(VD->getLocation(), 6726 Context.getBaseElementType(Ty), 6727 diag::err_typecheck_decl_incomplete_type)) { 6728 VD->setInvalidDecl(); 6729 return; 6730 } 6731 6732 // Require an abstract type. 6733 if (RequireNonAbstractType(VD->getLocation(), Ty, 6734 diag::err_abstract_type_in_decl, 6735 AbstractVariableType)) { 6736 VD->setInvalidDecl(); 6737 return; 6738 } 6739 6740 // Don't bother complaining about constructors or destructors, 6741 // though. 6742} 6743 6744void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6745 bool TypeMayContainAuto) { 6746 // If there is no declaration, there was an error parsing it. Just ignore it. 6747 if (RealDecl == 0) 6748 return; 6749 6750 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6751 QualType Type = Var->getType(); 6752 6753 // C++11 [dcl.spec.auto]p3 6754 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6755 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6756 << Var->getDeclName() << Type; 6757 Var->setInvalidDecl(); 6758 return; 6759 } 6760 6761 // C++11 [class.static.data]p3: A static data member can be declared with 6762 // the constexpr specifier; if so, its declaration shall specify 6763 // a brace-or-equal-initializer. 6764 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6765 // the definition of a variable [...] or the declaration of a static data 6766 // member. 6767 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6768 if (Var->isStaticDataMember()) 6769 Diag(Var->getLocation(), 6770 diag::err_constexpr_static_mem_var_requires_init) 6771 << Var->getDeclName(); 6772 else 6773 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6774 Var->setInvalidDecl(); 6775 return; 6776 } 6777 6778 switch (Var->isThisDeclarationADefinition()) { 6779 case VarDecl::Definition: 6780 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6781 break; 6782 6783 // We have an out-of-line definition of a static data member 6784 // that has an in-class initializer, so we type-check this like 6785 // a declaration. 6786 // 6787 // Fall through 6788 6789 case VarDecl::DeclarationOnly: 6790 // It's only a declaration. 6791 6792 // Block scope. C99 6.7p7: If an identifier for an object is 6793 // declared with no linkage (C99 6.2.2p6), the type for the 6794 // object shall be complete. 6795 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6796 !Var->getLinkage() && !Var->isInvalidDecl() && 6797 RequireCompleteType(Var->getLocation(), Type, 6798 diag::err_typecheck_decl_incomplete_type)) 6799 Var->setInvalidDecl(); 6800 6801 // Make sure that the type is not abstract. 6802 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6803 RequireNonAbstractType(Var->getLocation(), Type, 6804 diag::err_abstract_type_in_decl, 6805 AbstractVariableType)) 6806 Var->setInvalidDecl(); 6807 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6808 Var->getStorageClass() == SC_PrivateExtern) { 6809 Diag(Var->getLocation(), diag::warn_private_extern); 6810 Diag(Var->getLocation(), diag::note_private_extern); 6811 } 6812 6813 return; 6814 6815 case VarDecl::TentativeDefinition: 6816 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6817 // object that has file scope without an initializer, and without a 6818 // storage-class specifier or with the storage-class specifier "static", 6819 // constitutes a tentative definition. Note: A tentative definition with 6820 // external linkage is valid (C99 6.2.2p5). 6821 if (!Var->isInvalidDecl()) { 6822 if (const IncompleteArrayType *ArrayT 6823 = Context.getAsIncompleteArrayType(Type)) { 6824 if (RequireCompleteType(Var->getLocation(), 6825 ArrayT->getElementType(), 6826 diag::err_illegal_decl_array_incomplete_type)) 6827 Var->setInvalidDecl(); 6828 } else if (Var->getStorageClass() == SC_Static) { 6829 // C99 6.9.2p3: If the declaration of an identifier for an object is 6830 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6831 // declared type shall not be an incomplete type. 6832 // NOTE: code such as the following 6833 // static struct s; 6834 // struct s { int a; }; 6835 // is accepted by gcc. Hence here we issue a warning instead of 6836 // an error and we do not invalidate the static declaration. 6837 // NOTE: to avoid multiple warnings, only check the first declaration. 6838 if (Var->getPreviousDecl() == 0) 6839 RequireCompleteType(Var->getLocation(), Type, 6840 diag::ext_typecheck_decl_incomplete_type); 6841 } 6842 } 6843 6844 // Record the tentative definition; we're done. 6845 if (!Var->isInvalidDecl()) 6846 TentativeDefinitions.push_back(Var); 6847 return; 6848 } 6849 6850 // Provide a specific diagnostic for uninitialized variable 6851 // definitions with incomplete array type. 6852 if (Type->isIncompleteArrayType()) { 6853 Diag(Var->getLocation(), 6854 diag::err_typecheck_incomplete_array_needs_initializer); 6855 Var->setInvalidDecl(); 6856 return; 6857 } 6858 6859 // Provide a specific diagnostic for uninitialized variable 6860 // definitions with reference type. 6861 if (Type->isReferenceType()) { 6862 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6863 << Var->getDeclName() 6864 << SourceRange(Var->getLocation(), Var->getLocation()); 6865 Var->setInvalidDecl(); 6866 return; 6867 } 6868 6869 // Do not attempt to type-check the default initializer for a 6870 // variable with dependent type. 6871 if (Type->isDependentType()) 6872 return; 6873 6874 if (Var->isInvalidDecl()) 6875 return; 6876 6877 if (RequireCompleteType(Var->getLocation(), 6878 Context.getBaseElementType(Type), 6879 diag::err_typecheck_decl_incomplete_type)) { 6880 Var->setInvalidDecl(); 6881 return; 6882 } 6883 6884 // The variable can not have an abstract class type. 6885 if (RequireNonAbstractType(Var->getLocation(), Type, 6886 diag::err_abstract_type_in_decl, 6887 AbstractVariableType)) { 6888 Var->setInvalidDecl(); 6889 return; 6890 } 6891 6892 // Check for jumps past the implicit initializer. C++0x 6893 // clarifies that this applies to a "variable with automatic 6894 // storage duration", not a "local variable". 6895 // C++11 [stmt.dcl]p3 6896 // A program that jumps from a point where a variable with automatic 6897 // storage duration is not in scope to a point where it is in scope is 6898 // ill-formed unless the variable has scalar type, class type with a 6899 // trivial default constructor and a trivial destructor, a cv-qualified 6900 // version of one of these types, or an array of one of the preceding 6901 // types and is declared without an initializer. 6902 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) { 6903 if (const RecordType *Record 6904 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6905 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6906 // Mark the function for further checking even if the looser rules of 6907 // C++11 do not require such checks, so that we can diagnose 6908 // incompatibilities with C++98. 6909 if (!CXXRecord->isPOD()) 6910 getCurFunction()->setHasBranchProtectedScope(); 6911 } 6912 } 6913 6914 // C++03 [dcl.init]p9: 6915 // If no initializer is specified for an object, and the 6916 // object is of (possibly cv-qualified) non-POD class type (or 6917 // array thereof), the object shall be default-initialized; if 6918 // the object is of const-qualified type, the underlying class 6919 // type shall have a user-declared default 6920 // constructor. Otherwise, if no initializer is specified for 6921 // a non- static object, the object and its subobjects, if 6922 // any, have an indeterminate initial value); if the object 6923 // or any of its subobjects are of const-qualified type, the 6924 // program is ill-formed. 6925 // C++0x [dcl.init]p11: 6926 // If no initializer is specified for an object, the object is 6927 // default-initialized; [...]. 6928 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6929 InitializationKind Kind 6930 = InitializationKind::CreateDefault(Var->getLocation()); 6931 6932 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6933 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, MultiExprArg()); 6934 if (Init.isInvalid()) 6935 Var->setInvalidDecl(); 6936 else if (Init.get()) { 6937 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6938 // This is important for template substitution. 6939 Var->setInitStyle(VarDecl::CallInit); 6940 } 6941 6942 CheckCompleteVariableDeclaration(Var); 6943 } 6944} 6945 6946void Sema::ActOnCXXForRangeDecl(Decl *D) { 6947 VarDecl *VD = dyn_cast<VarDecl>(D); 6948 if (!VD) { 6949 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6950 D->setInvalidDecl(); 6951 return; 6952 } 6953 6954 VD->setCXXForRangeDecl(true); 6955 6956 // for-range-declaration cannot be given a storage class specifier. 6957 int Error = -1; 6958 switch (VD->getStorageClassAsWritten()) { 6959 case SC_None: 6960 break; 6961 case SC_Extern: 6962 Error = 0; 6963 break; 6964 case SC_Static: 6965 Error = 1; 6966 break; 6967 case SC_PrivateExtern: 6968 Error = 2; 6969 break; 6970 case SC_Auto: 6971 Error = 3; 6972 break; 6973 case SC_Register: 6974 Error = 4; 6975 break; 6976 case SC_OpenCLWorkGroupLocal: 6977 llvm_unreachable("Unexpected storage class"); 6978 } 6979 if (VD->isConstexpr()) 6980 Error = 5; 6981 if (Error != -1) { 6982 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6983 << VD->getDeclName() << Error; 6984 D->setInvalidDecl(); 6985 } 6986} 6987 6988void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6989 if (var->isInvalidDecl()) return; 6990 6991 // In ARC, don't allow jumps past the implicit initialization of a 6992 // local retaining variable. 6993 if (getLangOpts().ObjCAutoRefCount && 6994 var->hasLocalStorage()) { 6995 switch (var->getType().getObjCLifetime()) { 6996 case Qualifiers::OCL_None: 6997 case Qualifiers::OCL_ExplicitNone: 6998 case Qualifiers::OCL_Autoreleasing: 6999 break; 7000 7001 case Qualifiers::OCL_Weak: 7002 case Qualifiers::OCL_Strong: 7003 getCurFunction()->setHasBranchProtectedScope(); 7004 break; 7005 } 7006 } 7007 7008 // All the following checks are C++ only. 7009 if (!getLangOpts().CPlusPlus) return; 7010 7011 QualType baseType = Context.getBaseElementType(var->getType()); 7012 if (baseType->isDependentType()) return; 7013 7014 // __block variables might require us to capture a copy-initializer. 7015 if (var->hasAttr<BlocksAttr>()) { 7016 // It's currently invalid to ever have a __block variable with an 7017 // array type; should we diagnose that here? 7018 7019 // Regardless, we don't want to ignore array nesting when 7020 // constructing this copy. 7021 QualType type = var->getType(); 7022 7023 if (type->isStructureOrClassType()) { 7024 SourceLocation poi = var->getLocation(); 7025 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi); 7026 ExprResult result = 7027 PerformCopyInitialization( 7028 InitializedEntity::InitializeBlock(poi, type, false), 7029 poi, Owned(varRef)); 7030 if (!result.isInvalid()) { 7031 result = MaybeCreateExprWithCleanups(result); 7032 Expr *init = result.takeAs<Expr>(); 7033 Context.setBlockVarCopyInits(var, init); 7034 } 7035 } 7036 } 7037 7038 Expr *Init = var->getInit(); 7039 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 7040 7041 if (!var->getDeclContext()->isDependentContext() && Init) { 7042 if (IsGlobal && !var->isConstexpr() && 7043 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 7044 var->getLocation()) 7045 != DiagnosticsEngine::Ignored && 7046 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 7047 Diag(var->getLocation(), diag::warn_global_constructor) 7048 << Init->getSourceRange(); 7049 7050 if (var->isConstexpr()) { 7051 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 7052 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 7053 SourceLocation DiagLoc = var->getLocation(); 7054 // If the note doesn't add any useful information other than a source 7055 // location, fold it into the primary diagnostic. 7056 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 7057 diag::note_invalid_subexpr_in_const_expr) { 7058 DiagLoc = Notes[0].first; 7059 Notes.clear(); 7060 } 7061 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 7062 << var << Init->getSourceRange(); 7063 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 7064 Diag(Notes[I].first, Notes[I].second); 7065 } 7066 } else if (var->isUsableInConstantExpressions(Context)) { 7067 // Check whether the initializer of a const variable of integral or 7068 // enumeration type is an ICE now, since we can't tell whether it was 7069 // initialized by a constant expression if we check later. 7070 var->checkInitIsICE(); 7071 } 7072 } 7073 7074 // Require the destructor. 7075 if (const RecordType *recordType = baseType->getAs<RecordType>()) 7076 FinalizeVarWithDestructor(var, recordType); 7077} 7078 7079/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 7080/// any semantic actions necessary after any initializer has been attached. 7081void 7082Sema::FinalizeDeclaration(Decl *ThisDecl) { 7083 // Note that we are no longer parsing the initializer for this declaration. 7084 ParsingInitForAutoVars.erase(ThisDecl); 7085 7086 // Now we have parsed the initializer and can update the table of magic 7087 // tag values. 7088 if (ThisDecl && ThisDecl->hasAttr<TypeTagForDatatypeAttr>()) { 7089 const VarDecl *VD = dyn_cast<VarDecl>(ThisDecl); 7090 if (VD && VD->getType()->isIntegralOrEnumerationType()) { 7091 for (specific_attr_iterator<TypeTagForDatatypeAttr> 7092 I = ThisDecl->specific_attr_begin<TypeTagForDatatypeAttr>(), 7093 E = ThisDecl->specific_attr_end<TypeTagForDatatypeAttr>(); 7094 I != E; ++I) { 7095 const Expr *MagicValueExpr = VD->getInit(); 7096 if (!MagicValueExpr) { 7097 continue; 7098 } 7099 llvm::APSInt MagicValueInt; 7100 if (!MagicValueExpr->isIntegerConstantExpr(MagicValueInt, Context)) { 7101 Diag(I->getRange().getBegin(), 7102 diag::err_type_tag_for_datatype_not_ice) 7103 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange(); 7104 continue; 7105 } 7106 if (MagicValueInt.getActiveBits() > 64) { 7107 Diag(I->getRange().getBegin(), 7108 diag::err_type_tag_for_datatype_too_large) 7109 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange(); 7110 continue; 7111 } 7112 uint64_t MagicValue = MagicValueInt.getZExtValue(); 7113 RegisterTypeTagForDatatype(I->getArgumentKind(), 7114 MagicValue, 7115 I->getMatchingCType(), 7116 I->getLayoutCompatible(), 7117 I->getMustBeNull()); 7118 } 7119 } 7120 } 7121} 7122 7123Sema::DeclGroupPtrTy 7124Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 7125 Decl **Group, unsigned NumDecls) { 7126 SmallVector<Decl*, 8> Decls; 7127 7128 if (DS.isTypeSpecOwned()) 7129 Decls.push_back(DS.getRepAsDecl()); 7130 7131 for (unsigned i = 0; i != NumDecls; ++i) 7132 if (Decl *D = Group[i]) 7133 Decls.push_back(D); 7134 7135 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 7136 DS.getTypeSpecType() == DeclSpec::TST_auto); 7137} 7138 7139/// BuildDeclaratorGroup - convert a list of declarations into a declaration 7140/// group, performing any necessary semantic checking. 7141Sema::DeclGroupPtrTy 7142Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 7143 bool TypeMayContainAuto) { 7144 // C++0x [dcl.spec.auto]p7: 7145 // If the type deduced for the template parameter U is not the same in each 7146 // deduction, the program is ill-formed. 7147 // FIXME: When initializer-list support is added, a distinction is needed 7148 // between the deduced type U and the deduced type which 'auto' stands for. 7149 // auto a = 0, b = { 1, 2, 3 }; 7150 // is legal because the deduced type U is 'int' in both cases. 7151 if (TypeMayContainAuto && NumDecls > 1) { 7152 QualType Deduced; 7153 CanQualType DeducedCanon; 7154 VarDecl *DeducedDecl = 0; 7155 for (unsigned i = 0; i != NumDecls; ++i) { 7156 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 7157 AutoType *AT = D->getType()->getContainedAutoType(); 7158 // Don't reissue diagnostics when instantiating a template. 7159 if (AT && D->isInvalidDecl()) 7160 break; 7161 if (AT && AT->isDeduced()) { 7162 QualType U = AT->getDeducedType(); 7163 CanQualType UCanon = Context.getCanonicalType(U); 7164 if (Deduced.isNull()) { 7165 Deduced = U; 7166 DeducedCanon = UCanon; 7167 DeducedDecl = D; 7168 } else if (DeducedCanon != UCanon) { 7169 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 7170 diag::err_auto_different_deductions) 7171 << Deduced << DeducedDecl->getDeclName() 7172 << U << D->getDeclName() 7173 << DeducedDecl->getInit()->getSourceRange() 7174 << D->getInit()->getSourceRange(); 7175 D->setInvalidDecl(); 7176 break; 7177 } 7178 } 7179 } 7180 } 7181 } 7182 7183 ActOnDocumentableDecls(Group, NumDecls); 7184 7185 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 7186} 7187 7188void Sema::ActOnDocumentableDecl(Decl *D) { 7189 ActOnDocumentableDecls(&D, 1); 7190} 7191 7192void Sema::ActOnDocumentableDecls(Decl **Group, unsigned NumDecls) { 7193 // Don't parse the comment if Doxygen diagnostics are ignored. 7194 if (NumDecls == 0 || !Group[0]) 7195 return; 7196 7197 if (Diags.getDiagnosticLevel(diag::warn_doc_param_not_found, 7198 Group[0]->getLocation()) 7199 == DiagnosticsEngine::Ignored) 7200 return; 7201 7202 if (NumDecls >= 2) { 7203 // This is a decl group. Normally it will contain only declarations 7204 // procuded from declarator list. But in case we have any definitions or 7205 // additional declaration references: 7206 // 'typedef struct S {} S;' 7207 // 'typedef struct S *S;' 7208 // 'struct S *pS;' 7209 // FinalizeDeclaratorGroup adds these as separate declarations. 7210 Decl *MaybeTagDecl = Group[0]; 7211 if (MaybeTagDecl && isa<TagDecl>(MaybeTagDecl)) { 7212 Group++; 7213 NumDecls--; 7214 } 7215 } 7216 7217 // See if there are any new comments that are not attached to a decl. 7218 ArrayRef<RawComment *> Comments = Context.getRawCommentList().getComments(); 7219 if (!Comments.empty() && 7220 !Comments.back()->isAttached()) { 7221 // There is at least one comment that not attached to a decl. 7222 // Maybe it should be attached to one of these decls? 7223 // 7224 // Note that this way we pick up not only comments that precede the 7225 // declaration, but also comments that *follow* the declaration -- thanks to 7226 // the lookahead in the lexer: we've consumed the semicolon and looked 7227 // ahead through comments. 7228 for (unsigned i = 0; i != NumDecls; ++i) 7229 Context.getCommentForDecl(Group[i]); 7230 } 7231} 7232 7233/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 7234/// to introduce parameters into function prototype scope. 7235Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 7236 const DeclSpec &DS = D.getDeclSpec(); 7237 7238 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 7239 // C++03 [dcl.stc]p2 also permits 'auto'. 7240 VarDecl::StorageClass StorageClass = SC_None; 7241 VarDecl::StorageClass StorageClassAsWritten = SC_None; 7242 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 7243 StorageClass = SC_Register; 7244 StorageClassAsWritten = SC_Register; 7245 } else if (getLangOpts().CPlusPlus && 7246 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 7247 StorageClass = SC_Auto; 7248 StorageClassAsWritten = SC_Auto; 7249 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 7250 Diag(DS.getStorageClassSpecLoc(), 7251 diag::err_invalid_storage_class_in_func_decl); 7252 D.getMutableDeclSpec().ClearStorageClassSpecs(); 7253 } 7254 7255 if (D.getDeclSpec().isThreadSpecified()) 7256 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7257 if (D.getDeclSpec().isConstexprSpecified()) 7258 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 7259 << 0; 7260 7261 DiagnoseFunctionSpecifiers(D); 7262 7263 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7264 QualType parmDeclType = TInfo->getType(); 7265 7266 if (getLangOpts().CPlusPlus) { 7267 // Check that there are no default arguments inside the type of this 7268 // parameter. 7269 CheckExtraCXXDefaultArguments(D); 7270 7271 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 7272 if (D.getCXXScopeSpec().isSet()) { 7273 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 7274 << D.getCXXScopeSpec().getRange(); 7275 D.getCXXScopeSpec().clear(); 7276 } 7277 } 7278 7279 // Ensure we have a valid name 7280 IdentifierInfo *II = 0; 7281 if (D.hasName()) { 7282 II = D.getIdentifier(); 7283 if (!II) { 7284 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 7285 << GetNameForDeclarator(D).getName().getAsString(); 7286 D.setInvalidType(true); 7287 } 7288 } 7289 7290 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 7291 if (II) { 7292 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 7293 ForRedeclaration); 7294 LookupName(R, S); 7295 if (R.isSingleResult()) { 7296 NamedDecl *PrevDecl = R.getFoundDecl(); 7297 if (PrevDecl->isTemplateParameter()) { 7298 // Maybe we will complain about the shadowed template parameter. 7299 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7300 // Just pretend that we didn't see the previous declaration. 7301 PrevDecl = 0; 7302 } else if (S->isDeclScope(PrevDecl)) { 7303 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 7304 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7305 7306 // Recover by removing the name 7307 II = 0; 7308 D.SetIdentifier(0, D.getIdentifierLoc()); 7309 D.setInvalidType(true); 7310 } 7311 } 7312 } 7313 7314 // Temporarily put parameter variables in the translation unit, not 7315 // the enclosing context. This prevents them from accidentally 7316 // looking like class members in C++. 7317 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 7318 D.getLocStart(), 7319 D.getIdentifierLoc(), II, 7320 parmDeclType, TInfo, 7321 StorageClass, StorageClassAsWritten); 7322 7323 if (D.isInvalidType()) 7324 New->setInvalidDecl(); 7325 7326 assert(S->isFunctionPrototypeScope()); 7327 assert(S->getFunctionPrototypeDepth() >= 1); 7328 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 7329 S->getNextFunctionPrototypeIndex()); 7330 7331 // Add the parameter declaration into this scope. 7332 S->AddDecl(New); 7333 if (II) 7334 IdResolver.AddDecl(New); 7335 7336 ProcessDeclAttributes(S, New, D); 7337 7338 if (D.getDeclSpec().isModulePrivateSpecified()) 7339 Diag(New->getLocation(), diag::err_module_private_local) 7340 << 1 << New->getDeclName() 7341 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7342 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7343 7344 if (New->hasAttr<BlocksAttr>()) { 7345 Diag(New->getLocation(), diag::err_block_on_nonlocal); 7346 } 7347 return New; 7348} 7349 7350/// \brief Synthesizes a variable for a parameter arising from a 7351/// typedef. 7352ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 7353 SourceLocation Loc, 7354 QualType T) { 7355 /* FIXME: setting StartLoc == Loc. 7356 Would it be worth to modify callers so as to provide proper source 7357 location for the unnamed parameters, embedding the parameter's type? */ 7358 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 7359 T, Context.getTrivialTypeSourceInfo(T, Loc), 7360 SC_None, SC_None, 0); 7361 Param->setImplicit(); 7362 return Param; 7363} 7364 7365void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 7366 ParmVarDecl * const *ParamEnd) { 7367 // Don't diagnose unused-parameter errors in template instantiations; we 7368 // will already have done so in the template itself. 7369 if (!ActiveTemplateInstantiations.empty()) 7370 return; 7371 7372 for (; Param != ParamEnd; ++Param) { 7373 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 7374 !(*Param)->hasAttr<UnusedAttr>()) { 7375 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 7376 << (*Param)->getDeclName(); 7377 } 7378 } 7379} 7380 7381void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 7382 ParmVarDecl * const *ParamEnd, 7383 QualType ReturnTy, 7384 NamedDecl *D) { 7385 if (LangOpts.NumLargeByValueCopy == 0) // No check. 7386 return; 7387 7388 // Warn if the return value is pass-by-value and larger than the specified 7389 // threshold. 7390 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 7391 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 7392 if (Size > LangOpts.NumLargeByValueCopy) 7393 Diag(D->getLocation(), diag::warn_return_value_size) 7394 << D->getDeclName() << Size; 7395 } 7396 7397 // Warn if any parameter is pass-by-value and larger than the specified 7398 // threshold. 7399 for (; Param != ParamEnd; ++Param) { 7400 QualType T = (*Param)->getType(); 7401 if (T->isDependentType() || !T.isPODType(Context)) 7402 continue; 7403 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 7404 if (Size > LangOpts.NumLargeByValueCopy) 7405 Diag((*Param)->getLocation(), diag::warn_parameter_size) 7406 << (*Param)->getDeclName() << Size; 7407 } 7408} 7409 7410ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 7411 SourceLocation NameLoc, IdentifierInfo *Name, 7412 QualType T, TypeSourceInfo *TSInfo, 7413 VarDecl::StorageClass StorageClass, 7414 VarDecl::StorageClass StorageClassAsWritten) { 7415 // In ARC, infer a lifetime qualifier for appropriate parameter types. 7416 if (getLangOpts().ObjCAutoRefCount && 7417 T.getObjCLifetime() == Qualifiers::OCL_None && 7418 T->isObjCLifetimeType()) { 7419 7420 Qualifiers::ObjCLifetime lifetime; 7421 7422 // Special cases for arrays: 7423 // - if it's const, use __unsafe_unretained 7424 // - otherwise, it's an error 7425 if (T->isArrayType()) { 7426 if (!T.isConstQualified()) { 7427 DelayedDiagnostics.add( 7428 sema::DelayedDiagnostic::makeForbiddenType( 7429 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 7430 } 7431 lifetime = Qualifiers::OCL_ExplicitNone; 7432 } else { 7433 lifetime = T->getObjCARCImplicitLifetime(); 7434 } 7435 T = Context.getLifetimeQualifiedType(T, lifetime); 7436 } 7437 7438 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 7439 Context.getAdjustedParameterType(T), 7440 TSInfo, 7441 StorageClass, StorageClassAsWritten, 7442 0); 7443 7444 // Parameters can not be abstract class types. 7445 // For record types, this is done by the AbstractClassUsageDiagnoser once 7446 // the class has been completely parsed. 7447 if (!CurContext->isRecord() && 7448 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 7449 AbstractParamType)) 7450 New->setInvalidDecl(); 7451 7452 // Parameter declarators cannot be interface types. All ObjC objects are 7453 // passed by reference. 7454 if (T->isObjCObjectType()) { 7455 SourceLocation TypeEndLoc = TSInfo->getTypeLoc().getLocEnd(); 7456 Diag(NameLoc, 7457 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 7458 << FixItHint::CreateInsertion(TypeEndLoc, "*"); 7459 T = Context.getObjCObjectPointerType(T); 7460 New->setType(T); 7461 } 7462 7463 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 7464 // duration shall not be qualified by an address-space qualifier." 7465 // Since all parameters have automatic store duration, they can not have 7466 // an address space. 7467 if (T.getAddressSpace() != 0) { 7468 Diag(NameLoc, diag::err_arg_with_address_space); 7469 New->setInvalidDecl(); 7470 } 7471 7472 return New; 7473} 7474 7475void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 7476 SourceLocation LocAfterDecls) { 7477 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 7478 7479 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 7480 // for a K&R function. 7481 if (!FTI.hasPrototype) { 7482 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 7483 --i; 7484 if (FTI.ArgInfo[i].Param == 0) { 7485 SmallString<256> Code; 7486 llvm::raw_svector_ostream(Code) << " int " 7487 << FTI.ArgInfo[i].Ident->getName() 7488 << ";\n"; 7489 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 7490 << FTI.ArgInfo[i].Ident 7491 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 7492 7493 // Implicitly declare the argument as type 'int' for lack of a better 7494 // type. 7495 AttributeFactory attrs; 7496 DeclSpec DS(attrs); 7497 const char* PrevSpec; // unused 7498 unsigned DiagID; // unused 7499 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 7500 PrevSpec, DiagID); 7501 Declarator ParamD(DS, Declarator::KNRTypeListContext); 7502 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 7503 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 7504 } 7505 } 7506 } 7507} 7508 7509Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 7510 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 7511 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 7512 Scope *ParentScope = FnBodyScope->getParent(); 7513 7514 D.setFunctionDefinitionKind(FDK_Definition); 7515 Decl *DP = HandleDeclarator(ParentScope, D, MultiTemplateParamsArg()); 7516 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7517} 7518 7519static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7520 // Don't warn about invalid declarations. 7521 if (FD->isInvalidDecl()) 7522 return false; 7523 7524 // Or declarations that aren't global. 7525 if (!FD->isGlobal()) 7526 return false; 7527 7528 // Don't warn about C++ member functions. 7529 if (isa<CXXMethodDecl>(FD)) 7530 return false; 7531 7532 // Don't warn about 'main'. 7533 if (FD->isMain()) 7534 return false; 7535 7536 // Don't warn about inline functions. 7537 if (FD->isInlined()) 7538 return false; 7539 7540 // Don't warn about function templates. 7541 if (FD->getDescribedFunctionTemplate()) 7542 return false; 7543 7544 // Don't warn about function template specializations. 7545 if (FD->isFunctionTemplateSpecialization()) 7546 return false; 7547 7548 // Don't warn for OpenCL kernels. 7549 if (FD->hasAttr<OpenCLKernelAttr>()) 7550 return false; 7551 7552 bool MissingPrototype = true; 7553 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7554 Prev; Prev = Prev->getPreviousDecl()) { 7555 // Ignore any declarations that occur in function or method 7556 // scope, because they aren't visible from the header. 7557 if (Prev->getDeclContext()->isFunctionOrMethod()) 7558 continue; 7559 7560 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7561 break; 7562 } 7563 7564 return MissingPrototype; 7565} 7566 7567void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7568 // Don't complain if we're in GNU89 mode and the previous definition 7569 // was an extern inline function. 7570 const FunctionDecl *Definition; 7571 if (FD->isDefined(Definition) && 7572 !canRedefineFunction(Definition, getLangOpts())) { 7573 if (getLangOpts().GNUMode && Definition->isInlineSpecified() && 7574 Definition->getStorageClass() == SC_Extern) 7575 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7576 << FD->getDeclName() << getLangOpts().CPlusPlus; 7577 else 7578 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7579 Diag(Definition->getLocation(), diag::note_previous_definition); 7580 FD->setInvalidDecl(); 7581 } 7582} 7583 7584Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7585 // Clear the last template instantiation error context. 7586 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7587 7588 if (!D) 7589 return D; 7590 FunctionDecl *FD = 0; 7591 7592 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7593 FD = FunTmpl->getTemplatedDecl(); 7594 else 7595 FD = cast<FunctionDecl>(D); 7596 7597 // Enter a new function scope 7598 PushFunctionScope(); 7599 7600 // See if this is a redefinition. 7601 if (!FD->isLateTemplateParsed()) 7602 CheckForFunctionRedefinition(FD); 7603 7604 // Builtin functions cannot be defined. 7605 if (unsigned BuiltinID = FD->getBuiltinID()) { 7606 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7607 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7608 FD->setInvalidDecl(); 7609 } 7610 } 7611 7612 // The return type of a function definition must be complete 7613 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7614 QualType ResultType = FD->getResultType(); 7615 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7616 !FD->isInvalidDecl() && 7617 RequireCompleteType(FD->getLocation(), ResultType, 7618 diag::err_func_def_incomplete_result)) 7619 FD->setInvalidDecl(); 7620 7621 // GNU warning -Wmissing-prototypes: 7622 // Warn if a global function is defined without a previous 7623 // prototype declaration. This warning is issued even if the 7624 // definition itself provides a prototype. The aim is to detect 7625 // global functions that fail to be declared in header files. 7626 if (ShouldWarnAboutMissingPrototype(FD)) 7627 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7628 7629 if (FnBodyScope) 7630 PushDeclContext(FnBodyScope, FD); 7631 7632 // Check the validity of our function parameters 7633 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7634 /*CheckParameterNames=*/true); 7635 7636 // Introduce our parameters into the function scope 7637 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7638 ParmVarDecl *Param = FD->getParamDecl(p); 7639 Param->setOwningFunction(FD); 7640 7641 // If this has an identifier, add it to the scope stack. 7642 if (Param->getIdentifier() && FnBodyScope) { 7643 CheckShadow(FnBodyScope, Param); 7644 7645 PushOnScopeChains(Param, FnBodyScope); 7646 } 7647 } 7648 7649 // If we had any tags defined in the function prototype, 7650 // introduce them into the function scope. 7651 if (FnBodyScope) { 7652 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(), 7653 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) { 7654 NamedDecl *D = *I; 7655 7656 // Some of these decls (like enums) may have been pinned to the translation unit 7657 // for lack of a real context earlier. If so, remove from the translation unit 7658 // and reattach to the current context. 7659 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) { 7660 // Is the decl actually in the context? 7661 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(), 7662 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) { 7663 if (*DI == D) { 7664 Context.getTranslationUnitDecl()->removeDecl(D); 7665 break; 7666 } 7667 } 7668 // Either way, reassign the lexical decl context to our FunctionDecl. 7669 D->setLexicalDeclContext(CurContext); 7670 } 7671 7672 // If the decl has a non-null name, make accessible in the current scope. 7673 if (!D->getName().empty()) 7674 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false); 7675 7676 // Similarly, dive into enums and fish their constants out, making them 7677 // accessible in this scope. 7678 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) { 7679 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(), 7680 EE = ED->enumerator_end(); EI != EE; ++EI) 7681 PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false); 7682 } 7683 } 7684 } 7685 7686 // Ensure that the function's exception specification is instantiated. 7687 if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>()) 7688 ResolveExceptionSpec(D->getLocation(), FPT); 7689 7690 // Checking attributes of current function definition 7691 // dllimport attribute. 7692 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7693 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7694 // dllimport attribute cannot be directly applied to definition. 7695 // Microsoft accepts dllimport for functions defined within class scope. 7696 if (!DA->isInherited() && 7697 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7698 Diag(FD->getLocation(), 7699 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7700 << "dllimport"; 7701 FD->setInvalidDecl(); 7702 return FD; 7703 } 7704 7705 // Visual C++ appears to not think this is an issue, so only issue 7706 // a warning when Microsoft extensions are disabled. 7707 if (!LangOpts.MicrosoftExt) { 7708 // If a symbol previously declared dllimport is later defined, the 7709 // attribute is ignored in subsequent references, and a warning is 7710 // emitted. 7711 Diag(FD->getLocation(), 7712 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7713 << FD->getName() << "dllimport"; 7714 } 7715 } 7716 // We want to attach documentation to original Decl (which might be 7717 // a function template). 7718 ActOnDocumentableDecl(D); 7719 return FD; 7720} 7721 7722/// \brief Given the set of return statements within a function body, 7723/// compute the variables that are subject to the named return value 7724/// optimization. 7725/// 7726/// Each of the variables that is subject to the named return value 7727/// optimization will be marked as NRVO variables in the AST, and any 7728/// return statement that has a marked NRVO variable as its NRVO candidate can 7729/// use the named return value optimization. 7730/// 7731/// This function applies a very simplistic algorithm for NRVO: if every return 7732/// statement in the function has the same NRVO candidate, that candidate is 7733/// the NRVO variable. 7734/// 7735/// FIXME: Employ a smarter algorithm that accounts for multiple return 7736/// statements and the lifetimes of the NRVO candidates. We should be able to 7737/// find a maximal set of NRVO variables. 7738void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7739 ReturnStmt **Returns = Scope->Returns.data(); 7740 7741 const VarDecl *NRVOCandidate = 0; 7742 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7743 if (!Returns[I]->getNRVOCandidate()) 7744 return; 7745 7746 if (!NRVOCandidate) 7747 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7748 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7749 return; 7750 } 7751 7752 if (NRVOCandidate) 7753 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7754} 7755 7756Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7757 return ActOnFinishFunctionBody(D, BodyArg, false); 7758} 7759 7760Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7761 bool IsInstantiation) { 7762 FunctionDecl *FD = 0; 7763 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7764 if (FunTmpl) 7765 FD = FunTmpl->getTemplatedDecl(); 7766 else 7767 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7768 7769 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7770 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7771 7772 if (FD) { 7773 FD->setBody(Body); 7774 7775 // If the function implicitly returns zero (like 'main') or is naked, 7776 // don't complain about missing return statements. 7777 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) 7778 WP.disableCheckFallThrough(); 7779 7780 // MSVC permits the use of pure specifier (=0) on function definition, 7781 // defined at class scope, warn about this non standard construct. 7782 if (getLangOpts().MicrosoftExt && FD->isPure()) 7783 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7784 7785 if (!FD->isInvalidDecl()) { 7786 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7787 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7788 FD->getResultType(), FD); 7789 7790 // If this is a constructor, we need a vtable. 7791 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7792 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7793 7794 // Try to apply the named return value optimization. We have to check 7795 // if we can do this here because lambdas keep return statements around 7796 // to deduce an implicit return type. 7797 if (getLangOpts().CPlusPlus && FD->getResultType()->isRecordType() && 7798 !FD->isDependentContext()) 7799 computeNRVO(Body, getCurFunction()); 7800 } 7801 7802 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 7803 "Function parsing confused"); 7804 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7805 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7806 MD->setBody(Body); 7807 if (!MD->isInvalidDecl()) { 7808 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7809 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7810 MD->getResultType(), MD); 7811 7812 if (Body) 7813 computeNRVO(Body, getCurFunction()); 7814 } 7815 if (getCurFunction()->ObjCShouldCallSuperDealloc) { 7816 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7817 getCurFunction()->ObjCShouldCallSuperDealloc = false; 7818 } 7819 if (getCurFunction()->ObjCShouldCallSuperFinalize) { 7820 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7821 getCurFunction()->ObjCShouldCallSuperFinalize = false; 7822 } 7823 } else { 7824 return 0; 7825 } 7826 7827 assert(!getCurFunction()->ObjCShouldCallSuperDealloc && 7828 "This should only be set for ObjC methods, which should have been " 7829 "handled in the block above."); 7830 assert(!getCurFunction()->ObjCShouldCallSuperFinalize && 7831 "This should only be set for ObjC methods, which should have been " 7832 "handled in the block above."); 7833 7834 // Verify and clean out per-function state. 7835 if (Body) { 7836 // C++ constructors that have function-try-blocks can't have return 7837 // statements in the handlers of that block. (C++ [except.handle]p14) 7838 // Verify this. 7839 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7840 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7841 7842 // Verify that gotos and switch cases don't jump into scopes illegally. 7843 if (getCurFunction()->NeedsScopeChecking() && 7844 !dcl->isInvalidDecl() && 7845 !hasAnyUnrecoverableErrorsInThisFunction() && 7846 !PP.isCodeCompletionEnabled()) 7847 DiagnoseInvalidJumps(Body); 7848 7849 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7850 if (!Destructor->getParent()->isDependentType()) 7851 CheckDestructor(Destructor); 7852 7853 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7854 Destructor->getParent()); 7855 } 7856 7857 // If any errors have occurred, clear out any temporaries that may have 7858 // been leftover. This ensures that these temporaries won't be picked up for 7859 // deletion in some later function. 7860 if (PP.getDiagnostics().hasErrorOccurred() || 7861 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7862 DiscardCleanupsInEvaluationContext(); 7863 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7864 // Since the body is valid, issue any analysis-based warnings that are 7865 // enabled. 7866 ActivePolicy = &WP; 7867 } 7868 7869 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7870 (!CheckConstexprFunctionDecl(FD) || 7871 !CheckConstexprFunctionBody(FD, Body))) 7872 FD->setInvalidDecl(); 7873 7874 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7875 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7876 assert(MaybeODRUseExprs.empty() && 7877 "Leftover expressions for odr-use checking"); 7878 } 7879 7880 if (!IsInstantiation) 7881 PopDeclContext(); 7882 7883 PopFunctionScopeInfo(ActivePolicy, dcl); 7884 7885 // If any errors have occurred, clear out any temporaries that may have 7886 // been leftover. This ensures that these temporaries won't be picked up for 7887 // deletion in some later function. 7888 if (getDiagnostics().hasErrorOccurred()) { 7889 DiscardCleanupsInEvaluationContext(); 7890 } 7891 7892 return dcl; 7893} 7894 7895 7896/// When we finish delayed parsing of an attribute, we must attach it to the 7897/// relevant Decl. 7898void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7899 ParsedAttributes &Attrs) { 7900 // Always attach attributes to the underlying decl. 7901 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7902 D = TD->getTemplatedDecl(); 7903 ProcessDeclAttributeList(S, D, Attrs.getList()); 7904 7905 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D)) 7906 if (Method->isStatic()) 7907 checkThisInStaticMemberFunctionAttributes(Method); 7908} 7909 7910 7911/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7912/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7913NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7914 IdentifierInfo &II, Scope *S) { 7915 // Before we produce a declaration for an implicitly defined 7916 // function, see whether there was a locally-scoped declaration of 7917 // this name as a function or variable. If so, use that 7918 // (non-visible) declaration, and complain about it. 7919 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7920 = findLocallyScopedExternalDecl(&II); 7921 if (Pos != LocallyScopedExternalDecls.end()) { 7922 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7923 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7924 return Pos->second; 7925 } 7926 7927 // Extension in C99. Legal in C90, but warn about it. 7928 unsigned diag_id; 7929 if (II.getName().startswith("__builtin_")) 7930 diag_id = diag::warn_builtin_unknown; 7931 else if (getLangOpts().C99) 7932 diag_id = diag::ext_implicit_function_decl; 7933 else 7934 diag_id = diag::warn_implicit_function_decl; 7935 Diag(Loc, diag_id) << &II; 7936 7937 // Because typo correction is expensive, only do it if the implicit 7938 // function declaration is going to be treated as an error. 7939 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7940 TypoCorrection Corrected; 7941 DeclFilterCCC<FunctionDecl> Validator; 7942 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7943 LookupOrdinaryName, S, 0, Validator))) { 7944 std::string CorrectedStr = Corrected.getAsString(getLangOpts()); 7945 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts()); 7946 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7947 7948 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7949 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7950 7951 if (Func->getLocation().isValid() 7952 && !II.getName().startswith("__builtin_")) 7953 Diag(Func->getLocation(), diag::note_previous_decl) 7954 << CorrectedQuotedStr; 7955 } 7956 } 7957 7958 // Set a Declarator for the implicit definition: int foo(); 7959 const char *Dummy; 7960 AttributeFactory attrFactory; 7961 DeclSpec DS(attrFactory); 7962 unsigned DiagID; 7963 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7964 (void)Error; // Silence warning. 7965 assert(!Error && "Error setting up implicit decl!"); 7966 Declarator D(DS, Declarator::BlockContext); 7967 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, false, 7968 SourceLocation(), 0, 0, 0, true, 7969 SourceLocation(), SourceLocation(), 7970 SourceLocation(), SourceLocation(), 7971 EST_None, SourceLocation(), 7972 0, 0, 0, 0, Loc, Loc, D), 7973 DS.getAttributes(), 7974 SourceLocation()); 7975 D.SetIdentifier(&II, Loc); 7976 7977 // Insert this function into translation-unit scope. 7978 7979 DeclContext *PrevDC = CurContext; 7980 CurContext = Context.getTranslationUnitDecl(); 7981 7982 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7983 FD->setImplicit(); 7984 7985 CurContext = PrevDC; 7986 7987 AddKnownFunctionAttributes(FD); 7988 7989 return FD; 7990} 7991 7992/// \brief Adds any function attributes that we know a priori based on 7993/// the declaration of this function. 7994/// 7995/// These attributes can apply both to implicitly-declared builtins 7996/// (like __builtin___printf_chk) or to library-declared functions 7997/// like NSLog or printf. 7998/// 7999/// We need to check for duplicate attributes both here and where user-written 8000/// attributes are applied to declarations. 8001void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 8002 if (FD->isInvalidDecl()) 8003 return; 8004 8005 // If this is a built-in function, map its builtin attributes to 8006 // actual attributes. 8007 if (unsigned BuiltinID = FD->getBuiltinID()) { 8008 // Handle printf-formatting attributes. 8009 unsigned FormatIdx; 8010 bool HasVAListArg; 8011 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 8012 if (!FD->getAttr<FormatAttr>()) { 8013 const char *fmt = "printf"; 8014 unsigned int NumParams = FD->getNumParams(); 8015 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 8016 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 8017 fmt = "NSString"; 8018 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 8019 fmt, FormatIdx+1, 8020 HasVAListArg ? 0 : FormatIdx+2)); 8021 } 8022 } 8023 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 8024 HasVAListArg)) { 8025 if (!FD->getAttr<FormatAttr>()) 8026 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 8027 "scanf", FormatIdx+1, 8028 HasVAListArg ? 0 : FormatIdx+2)); 8029 } 8030 8031 // Mark const if we don't care about errno and that is the only 8032 // thing preventing the function from being const. This allows 8033 // IRgen to use LLVM intrinsics for such functions. 8034 if (!getLangOpts().MathErrno && 8035 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 8036 if (!FD->getAttr<ConstAttr>()) 8037 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 8038 } 8039 8040 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 8041 !FD->getAttr<ReturnsTwiceAttr>()) 8042 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 8043 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 8044 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 8045 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 8046 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 8047 } 8048 8049 IdentifierInfo *Name = FD->getIdentifier(); 8050 if (!Name) 8051 return; 8052 if ((!getLangOpts().CPlusPlus && 8053 FD->getDeclContext()->isTranslationUnit()) || 8054 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 8055 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 8056 LinkageSpecDecl::lang_c)) { 8057 // Okay: this could be a libc/libm/Objective-C function we know 8058 // about. 8059 } else 8060 return; 8061 8062 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 8063 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 8064 // target-specific builtins, perhaps? 8065 if (!FD->getAttr<FormatAttr>()) 8066 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 8067 "printf", 2, 8068 Name->isStr("vasprintf") ? 0 : 3)); 8069 } 8070 8071 if (Name->isStr("__CFStringMakeConstantString")) { 8072 // We already have a __builtin___CFStringMakeConstantString, 8073 // but builds that use -fno-constant-cfstrings don't go through that. 8074 if (!FD->getAttr<FormatArgAttr>()) 8075 FD->addAttr(::new (Context) FormatArgAttr(FD->getLocation(), Context, 1)); 8076 } 8077} 8078 8079TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 8080 TypeSourceInfo *TInfo) { 8081 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 8082 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 8083 8084 if (!TInfo) { 8085 assert(D.isInvalidType() && "no declarator info for valid type"); 8086 TInfo = Context.getTrivialTypeSourceInfo(T); 8087 } 8088 8089 // Scope manipulation handled by caller. 8090 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 8091 D.getLocStart(), 8092 D.getIdentifierLoc(), 8093 D.getIdentifier(), 8094 TInfo); 8095 8096 // Bail out immediately if we have an invalid declaration. 8097 if (D.isInvalidType()) { 8098 NewTD->setInvalidDecl(); 8099 return NewTD; 8100 } 8101 8102 if (D.getDeclSpec().isModulePrivateSpecified()) { 8103 if (CurContext->isFunctionOrMethod()) 8104 Diag(NewTD->getLocation(), diag::err_module_private_local) 8105 << 2 << NewTD->getDeclName() 8106 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 8107 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 8108 else 8109 NewTD->setModulePrivate(); 8110 } 8111 8112 // C++ [dcl.typedef]p8: 8113 // If the typedef declaration defines an unnamed class (or 8114 // enum), the first typedef-name declared by the declaration 8115 // to be that class type (or enum type) is used to denote the 8116 // class type (or enum type) for linkage purposes only. 8117 // We need to check whether the type was declared in the declaration. 8118 switch (D.getDeclSpec().getTypeSpecType()) { 8119 case TST_enum: 8120 case TST_struct: 8121 case TST_union: 8122 case TST_class: { 8123 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 8124 8125 // Do nothing if the tag is not anonymous or already has an 8126 // associated typedef (from an earlier typedef in this decl group). 8127 if (tagFromDeclSpec->getIdentifier()) break; 8128 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 8129 8130 // A well-formed anonymous tag must always be a TUK_Definition. 8131 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 8132 8133 // The type must match the tag exactly; no qualifiers allowed. 8134 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 8135 break; 8136 8137 // Otherwise, set this is the anon-decl typedef for the tag. 8138 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 8139 break; 8140 } 8141 8142 default: 8143 break; 8144 } 8145 8146 return NewTD; 8147} 8148 8149 8150/// \brief Check that this is a valid underlying type for an enum declaration. 8151bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) { 8152 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 8153 QualType T = TI->getType(); 8154 8155 if (T->isDependentType() || T->isIntegralType(Context)) 8156 return false; 8157 8158 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T; 8159 return true; 8160} 8161 8162/// Check whether this is a valid redeclaration of a previous enumeration. 8163/// \return true if the redeclaration was invalid. 8164bool Sema::CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped, 8165 QualType EnumUnderlyingTy, 8166 const EnumDecl *Prev) { 8167 bool IsFixed = !EnumUnderlyingTy.isNull(); 8168 8169 if (IsScoped != Prev->isScoped()) { 8170 Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch) 8171 << Prev->isScoped(); 8172 Diag(Prev->getLocation(), diag::note_previous_use); 8173 return true; 8174 } 8175 8176 if (IsFixed && Prev->isFixed()) { 8177 if (!EnumUnderlyingTy->isDependentType() && 8178 !Prev->getIntegerType()->isDependentType() && 8179 !Context.hasSameUnqualifiedType(EnumUnderlyingTy, 8180 Prev->getIntegerType())) { 8181 Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch) 8182 << EnumUnderlyingTy << Prev->getIntegerType(); 8183 Diag(Prev->getLocation(), diag::note_previous_use); 8184 return true; 8185 } 8186 } else if (IsFixed != Prev->isFixed()) { 8187 Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch) 8188 << Prev->isFixed(); 8189 Diag(Prev->getLocation(), diag::note_previous_use); 8190 return true; 8191 } 8192 8193 return false; 8194} 8195 8196/// \brief Determine whether a tag with a given kind is acceptable 8197/// as a redeclaration of the given tag declaration. 8198/// 8199/// \returns true if the new tag kind is acceptable, false otherwise. 8200bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 8201 TagTypeKind NewTag, bool isDefinition, 8202 SourceLocation NewTagLoc, 8203 const IdentifierInfo &Name) { 8204 // C++ [dcl.type.elab]p3: 8205 // The class-key or enum keyword present in the 8206 // elaborated-type-specifier shall agree in kind with the 8207 // declaration to which the name in the elaborated-type-specifier 8208 // refers. This rule also applies to the form of 8209 // elaborated-type-specifier that declares a class-name or 8210 // friend class since it can be construed as referring to the 8211 // definition of the class. Thus, in any 8212 // elaborated-type-specifier, the enum keyword shall be used to 8213 // refer to an enumeration (7.2), the union class-key shall be 8214 // used to refer to a union (clause 9), and either the class or 8215 // struct class-key shall be used to refer to a class (clause 9) 8216 // declared using the class or struct class-key. 8217 TagTypeKind OldTag = Previous->getTagKind(); 8218 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 8219 if (OldTag == NewTag) 8220 return true; 8221 8222 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 8223 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 8224 // Warn about the struct/class tag mismatch. 8225 bool isTemplate = false; 8226 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 8227 isTemplate = Record->getDescribedClassTemplate(); 8228 8229 if (!ActiveTemplateInstantiations.empty()) { 8230 // In a template instantiation, do not offer fix-its for tag mismatches 8231 // since they usually mess up the template instead of fixing the problem. 8232 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 8233 << (NewTag == TTK_Class) << isTemplate << &Name; 8234 return true; 8235 } 8236 8237 if (isDefinition) { 8238 // On definitions, check previous tags and issue a fix-it for each 8239 // one that doesn't match the current tag. 8240 if (Previous->getDefinition()) { 8241 // Don't suggest fix-its for redefinitions. 8242 return true; 8243 } 8244 8245 bool previousMismatch = false; 8246 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 8247 E(Previous->redecls_end()); I != E; ++I) { 8248 if (I->getTagKind() != NewTag) { 8249 if (!previousMismatch) { 8250 previousMismatch = true; 8251 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 8252 << (NewTag == TTK_Class) << isTemplate << &Name; 8253 } 8254 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 8255 << (NewTag == TTK_Class) 8256 << FixItHint::CreateReplacement(I->getInnerLocStart(), 8257 NewTag == TTK_Class? 8258 "class" : "struct"); 8259 } 8260 } 8261 return true; 8262 } 8263 8264 // Check for a previous definition. If current tag and definition 8265 // are same type, do nothing. If no definition, but disagree with 8266 // with previous tag type, give a warning, but no fix-it. 8267 const TagDecl *Redecl = Previous->getDefinition() ? 8268 Previous->getDefinition() : Previous; 8269 if (Redecl->getTagKind() == NewTag) { 8270 return true; 8271 } 8272 8273 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 8274 << (NewTag == TTK_Class) 8275 << isTemplate << &Name; 8276 Diag(Redecl->getLocation(), diag::note_previous_use); 8277 8278 // If there is a previous defintion, suggest a fix-it. 8279 if (Previous->getDefinition()) { 8280 Diag(NewTagLoc, diag::note_struct_class_suggestion) 8281 << (Redecl->getTagKind() == TTK_Class) 8282 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 8283 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 8284 } 8285 8286 return true; 8287 } 8288 return false; 8289} 8290 8291/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 8292/// former case, Name will be non-null. In the later case, Name will be null. 8293/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 8294/// reference/declaration/definition of a tag. 8295Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 8296 SourceLocation KWLoc, CXXScopeSpec &SS, 8297 IdentifierInfo *Name, SourceLocation NameLoc, 8298 AttributeList *Attr, AccessSpecifier AS, 8299 SourceLocation ModulePrivateLoc, 8300 MultiTemplateParamsArg TemplateParameterLists, 8301 bool &OwnedDecl, bool &IsDependent, 8302 SourceLocation ScopedEnumKWLoc, 8303 bool ScopedEnumUsesClassTag, 8304 TypeResult UnderlyingType) { 8305 // If this is not a definition, it must have a name. 8306 IdentifierInfo *OrigName = Name; 8307 assert((Name != 0 || TUK == TUK_Definition) && 8308 "Nameless record must be a definition!"); 8309 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 8310 8311 OwnedDecl = false; 8312 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8313 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 8314 8315 // FIXME: Check explicit specializations more carefully. 8316 bool isExplicitSpecialization = false; 8317 bool Invalid = false; 8318 8319 // We only need to do this matching if we have template parameters 8320 // or a scope specifier, which also conveniently avoids this work 8321 // for non-C++ cases. 8322 if (TemplateParameterLists.size() > 0 || 8323 (SS.isNotEmpty() && TUK != TUK_Reference)) { 8324 if (TemplateParameterList *TemplateParams 8325 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 8326 TemplateParameterLists.data(), 8327 TemplateParameterLists.size(), 8328 TUK == TUK_Friend, 8329 isExplicitSpecialization, 8330 Invalid)) { 8331 if (TemplateParams->size() > 0) { 8332 // This is a declaration or definition of a class template (which may 8333 // be a member of another template). 8334 8335 if (Invalid) 8336 return 0; 8337 8338 OwnedDecl = false; 8339 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 8340 SS, Name, NameLoc, Attr, 8341 TemplateParams, AS, 8342 ModulePrivateLoc, 8343 TemplateParameterLists.size()-1, 8344 TemplateParameterLists.data()); 8345 return Result.get(); 8346 } else { 8347 // The "template<>" header is extraneous. 8348 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8349 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8350 isExplicitSpecialization = true; 8351 } 8352 } 8353 } 8354 8355 // Figure out the underlying type if this a enum declaration. We need to do 8356 // this early, because it's needed to detect if this is an incompatible 8357 // redeclaration. 8358 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 8359 8360 if (Kind == TTK_Enum) { 8361 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 8362 // No underlying type explicitly specified, or we failed to parse the 8363 // type, default to int. 8364 EnumUnderlying = Context.IntTy.getTypePtr(); 8365 else if (UnderlyingType.get()) { 8366 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 8367 // integral type; any cv-qualification is ignored. 8368 TypeSourceInfo *TI = 0; 8369 GetTypeFromParser(UnderlyingType.get(), &TI); 8370 EnumUnderlying = TI; 8371 8372 if (CheckEnumUnderlyingType(TI)) 8373 // Recover by falling back to int. 8374 EnumUnderlying = Context.IntTy.getTypePtr(); 8375 8376 if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI, 8377 UPPC_FixedUnderlyingType)) 8378 EnumUnderlying = Context.IntTy.getTypePtr(); 8379 8380 } else if (getLangOpts().MicrosoftMode) 8381 // Microsoft enums are always of int type. 8382 EnumUnderlying = Context.IntTy.getTypePtr(); 8383 } 8384 8385 DeclContext *SearchDC = CurContext; 8386 DeclContext *DC = CurContext; 8387 bool isStdBadAlloc = false; 8388 8389 RedeclarationKind Redecl = ForRedeclaration; 8390 if (TUK == TUK_Friend || TUK == TUK_Reference) 8391 Redecl = NotForRedeclaration; 8392 8393 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 8394 8395 if (Name && SS.isNotEmpty()) { 8396 // We have a nested-name tag ('struct foo::bar'). 8397 8398 // Check for invalid 'foo::'. 8399 if (SS.isInvalid()) { 8400 Name = 0; 8401 goto CreateNewDecl; 8402 } 8403 8404 // If this is a friend or a reference to a class in a dependent 8405 // context, don't try to make a decl for it. 8406 if (TUK == TUK_Friend || TUK == TUK_Reference) { 8407 DC = computeDeclContext(SS, false); 8408 if (!DC) { 8409 IsDependent = true; 8410 return 0; 8411 } 8412 } else { 8413 DC = computeDeclContext(SS, true); 8414 if (!DC) { 8415 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 8416 << SS.getRange(); 8417 return 0; 8418 } 8419 } 8420 8421 if (RequireCompleteDeclContext(SS, DC)) 8422 return 0; 8423 8424 SearchDC = DC; 8425 // Look-up name inside 'foo::'. 8426 LookupQualifiedName(Previous, DC); 8427 8428 if (Previous.isAmbiguous()) 8429 return 0; 8430 8431 if (Previous.empty()) { 8432 // Name lookup did not find anything. However, if the 8433 // nested-name-specifier refers to the current instantiation, 8434 // and that current instantiation has any dependent base 8435 // classes, we might find something at instantiation time: treat 8436 // this as a dependent elaborated-type-specifier. 8437 // But this only makes any sense for reference-like lookups. 8438 if (Previous.wasNotFoundInCurrentInstantiation() && 8439 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8440 IsDependent = true; 8441 return 0; 8442 } 8443 8444 // A tag 'foo::bar' must already exist. 8445 Diag(NameLoc, diag::err_not_tag_in_scope) 8446 << Kind << Name << DC << SS.getRange(); 8447 Name = 0; 8448 Invalid = true; 8449 goto CreateNewDecl; 8450 } 8451 } else if (Name) { 8452 // If this is a named struct, check to see if there was a previous forward 8453 // declaration or definition. 8454 // FIXME: We're looking into outer scopes here, even when we 8455 // shouldn't be. Doing so can result in ambiguities that we 8456 // shouldn't be diagnosing. 8457 LookupName(Previous, S); 8458 8459 if (Previous.isAmbiguous() && 8460 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 8461 LookupResult::Filter F = Previous.makeFilter(); 8462 while (F.hasNext()) { 8463 NamedDecl *ND = F.next(); 8464 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 8465 F.erase(); 8466 } 8467 F.done(); 8468 } 8469 8470 // Note: there used to be some attempt at recovery here. 8471 if (Previous.isAmbiguous()) 8472 return 0; 8473 8474 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) { 8475 // FIXME: This makes sure that we ignore the contexts associated 8476 // with C structs, unions, and enums when looking for a matching 8477 // tag declaration or definition. See the similar lookup tweak 8478 // in Sema::LookupName; is there a better way to deal with this? 8479 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 8480 SearchDC = SearchDC->getParent(); 8481 } 8482 } else if (S->isFunctionPrototypeScope()) { 8483 // If this is an enum declaration in function prototype scope, set its 8484 // initial context to the translation unit. 8485 // FIXME: [citation needed] 8486 SearchDC = Context.getTranslationUnitDecl(); 8487 } 8488 8489 if (Previous.isSingleResult() && 8490 Previous.getFoundDecl()->isTemplateParameter()) { 8491 // Maybe we will complain about the shadowed template parameter. 8492 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 8493 // Just pretend that we didn't see the previous declaration. 8494 Previous.clear(); 8495 } 8496 8497 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace && 8498 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 8499 // This is a declaration of or a reference to "std::bad_alloc". 8500 isStdBadAlloc = true; 8501 8502 if (Previous.empty() && StdBadAlloc) { 8503 // std::bad_alloc has been implicitly declared (but made invisible to 8504 // name lookup). Fill in this implicit declaration as the previous 8505 // declaration, so that the declarations get chained appropriately. 8506 Previous.addDecl(getStdBadAlloc()); 8507 } 8508 } 8509 8510 // If we didn't find a previous declaration, and this is a reference 8511 // (or friend reference), move to the correct scope. In C++, we 8512 // also need to do a redeclaration lookup there, just in case 8513 // there's a shadow friend decl. 8514 if (Name && Previous.empty() && 8515 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8516 if (Invalid) goto CreateNewDecl; 8517 assert(SS.isEmpty()); 8518 8519 if (TUK == TUK_Reference) { 8520 // C++ [basic.scope.pdecl]p5: 8521 // -- for an elaborated-type-specifier of the form 8522 // 8523 // class-key identifier 8524 // 8525 // if the elaborated-type-specifier is used in the 8526 // decl-specifier-seq or parameter-declaration-clause of a 8527 // function defined in namespace scope, the identifier is 8528 // declared as a class-name in the namespace that contains 8529 // the declaration; otherwise, except as a friend 8530 // declaration, the identifier is declared in the smallest 8531 // non-class, non-function-prototype scope that contains the 8532 // declaration. 8533 // 8534 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 8535 // C structs and unions. 8536 // 8537 // It is an error in C++ to declare (rather than define) an enum 8538 // type, including via an elaborated type specifier. We'll 8539 // diagnose that later; for now, declare the enum in the same 8540 // scope as we would have picked for any other tag type. 8541 // 8542 // GNU C also supports this behavior as part of its incomplete 8543 // enum types extension, while GNU C++ does not. 8544 // 8545 // Find the context where we'll be declaring the tag. 8546 // FIXME: We would like to maintain the current DeclContext as the 8547 // lexical context, 8548 while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod()) 8549 SearchDC = SearchDC->getParent(); 8550 8551 // Find the scope where we'll be declaring the tag. 8552 while (S->isClassScope() || 8553 (getLangOpts().CPlusPlus && 8554 S->isFunctionPrototypeScope()) || 8555 ((S->getFlags() & Scope::DeclScope) == 0) || 8556 (S->getEntity() && 8557 ((DeclContext *)S->getEntity())->isTransparentContext())) 8558 S = S->getParent(); 8559 } else { 8560 assert(TUK == TUK_Friend); 8561 // C++ [namespace.memdef]p3: 8562 // If a friend declaration in a non-local class first declares a 8563 // class or function, the friend class or function is a member of 8564 // the innermost enclosing namespace. 8565 SearchDC = SearchDC->getEnclosingNamespaceContext(); 8566 } 8567 8568 // In C++, we need to do a redeclaration lookup to properly 8569 // diagnose some problems. 8570 if (getLangOpts().CPlusPlus) { 8571 Previous.setRedeclarationKind(ForRedeclaration); 8572 LookupQualifiedName(Previous, SearchDC); 8573 } 8574 } 8575 8576 if (!Previous.empty()) { 8577 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 8578 8579 // It's okay to have a tag decl in the same scope as a typedef 8580 // which hides a tag decl in the same scope. Finding this 8581 // insanity with a redeclaration lookup can only actually happen 8582 // in C++. 8583 // 8584 // This is also okay for elaborated-type-specifiers, which is 8585 // technically forbidden by the current standard but which is 8586 // okay according to the likely resolution of an open issue; 8587 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 8588 if (getLangOpts().CPlusPlus) { 8589 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8590 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 8591 TagDecl *Tag = TT->getDecl(); 8592 if (Tag->getDeclName() == Name && 8593 Tag->getDeclContext()->getRedeclContext() 8594 ->Equals(TD->getDeclContext()->getRedeclContext())) { 8595 PrevDecl = Tag; 8596 Previous.clear(); 8597 Previous.addDecl(Tag); 8598 Previous.resolveKind(); 8599 } 8600 } 8601 } 8602 } 8603 8604 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 8605 // If this is a use of a previous tag, or if the tag is already declared 8606 // in the same scope (so that the definition/declaration completes or 8607 // rementions the tag), reuse the decl. 8608 if (TUK == TUK_Reference || TUK == TUK_Friend || 8609 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 8610 // Make sure that this wasn't declared as an enum and now used as a 8611 // struct or something similar. 8612 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 8613 TUK == TUK_Definition, KWLoc, 8614 *Name)) { 8615 bool SafeToContinue 8616 = (PrevTagDecl->getTagKind() != TTK_Enum && 8617 Kind != TTK_Enum); 8618 if (SafeToContinue) 8619 Diag(KWLoc, diag::err_use_with_wrong_tag) 8620 << Name 8621 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8622 PrevTagDecl->getKindName()); 8623 else 8624 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8625 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8626 8627 if (SafeToContinue) 8628 Kind = PrevTagDecl->getTagKind(); 8629 else { 8630 // Recover by making this an anonymous redefinition. 8631 Name = 0; 8632 Previous.clear(); 8633 Invalid = true; 8634 } 8635 } 8636 8637 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8638 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8639 8640 // If this is an elaborated-type-specifier for a scoped enumeration, 8641 // the 'class' keyword is not necessary and not permitted. 8642 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8643 if (ScopedEnum) 8644 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8645 << PrevEnum->isScoped() 8646 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8647 return PrevTagDecl; 8648 } 8649 8650 QualType EnumUnderlyingTy; 8651 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8652 EnumUnderlyingTy = TI->getType(); 8653 else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>()) 8654 EnumUnderlyingTy = QualType(T, 0); 8655 8656 // All conflicts with previous declarations are recovered by 8657 // returning the previous declaration, unless this is a definition, 8658 // in which case we want the caller to bail out. 8659 if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc, 8660 ScopedEnum, EnumUnderlyingTy, PrevEnum)) 8661 return TUK == TUK_Declaration ? PrevTagDecl : 0; 8662 } 8663 8664 if (!Invalid) { 8665 // If this is a use, just return the declaration we found. 8666 8667 // FIXME: In the future, return a variant or some other clue 8668 // for the consumer of this Decl to know it doesn't own it. 8669 // For our current ASTs this shouldn't be a problem, but will 8670 // need to be changed with DeclGroups. 8671 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8672 getLangOpts().MicrosoftExt)) || TUK == TUK_Friend) 8673 return PrevTagDecl; 8674 8675 // Diagnose attempts to redefine a tag. 8676 if (TUK == TUK_Definition) { 8677 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8678 // If we're defining a specialization and the previous definition 8679 // is from an implicit instantiation, don't emit an error 8680 // here; we'll catch this in the general case below. 8681 bool IsExplicitSpecializationAfterInstantiation = false; 8682 if (isExplicitSpecialization) { 8683 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def)) 8684 IsExplicitSpecializationAfterInstantiation = 8685 RD->getTemplateSpecializationKind() != 8686 TSK_ExplicitSpecialization; 8687 else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def)) 8688 IsExplicitSpecializationAfterInstantiation = 8689 ED->getTemplateSpecializationKind() != 8690 TSK_ExplicitSpecialization; 8691 } 8692 8693 if (!IsExplicitSpecializationAfterInstantiation) { 8694 // A redeclaration in function prototype scope in C isn't 8695 // visible elsewhere, so merely issue a warning. 8696 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope()) 8697 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name; 8698 else 8699 Diag(NameLoc, diag::err_redefinition) << Name; 8700 Diag(Def->getLocation(), diag::note_previous_definition); 8701 // If this is a redefinition, recover by making this 8702 // struct be anonymous, which will make any later 8703 // references get the previous definition. 8704 Name = 0; 8705 Previous.clear(); 8706 Invalid = true; 8707 } 8708 } else { 8709 // If the type is currently being defined, complain 8710 // about a nested redefinition. 8711 const TagType *Tag 8712 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8713 if (Tag->isBeingDefined()) { 8714 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8715 Diag(PrevTagDecl->getLocation(), 8716 diag::note_previous_definition); 8717 Name = 0; 8718 Previous.clear(); 8719 Invalid = true; 8720 } 8721 } 8722 8723 // Okay, this is definition of a previously declared or referenced 8724 // tag PrevDecl. We're going to create a new Decl for it. 8725 } 8726 } 8727 // If we get here we have (another) forward declaration or we 8728 // have a definition. Just create a new decl. 8729 8730 } else { 8731 // If we get here, this is a definition of a new tag type in a nested 8732 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8733 // new decl/type. We set PrevDecl to NULL so that the entities 8734 // have distinct types. 8735 Previous.clear(); 8736 } 8737 // If we get here, we're going to create a new Decl. If PrevDecl 8738 // is non-NULL, it's a definition of the tag declared by 8739 // PrevDecl. If it's NULL, we have a new definition. 8740 8741 8742 // Otherwise, PrevDecl is not a tag, but was found with tag 8743 // lookup. This is only actually possible in C++, where a few 8744 // things like templates still live in the tag namespace. 8745 } else { 8746 // Use a better diagnostic if an elaborated-type-specifier 8747 // found the wrong kind of type on the first 8748 // (non-redeclaration) lookup. 8749 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8750 !Previous.isForRedeclaration()) { 8751 unsigned Kind = 0; 8752 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8753 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8754 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8755 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8756 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8757 Invalid = true; 8758 8759 // Otherwise, only diagnose if the declaration is in scope. 8760 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8761 isExplicitSpecialization)) { 8762 // do nothing 8763 8764 // Diagnose implicit declarations introduced by elaborated types. 8765 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8766 unsigned Kind = 0; 8767 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8768 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8769 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8770 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8771 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8772 Invalid = true; 8773 8774 // Otherwise it's a declaration. Call out a particularly common 8775 // case here. 8776 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8777 unsigned Kind = 0; 8778 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8779 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8780 << Name << Kind << TND->getUnderlyingType(); 8781 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8782 Invalid = true; 8783 8784 // Otherwise, diagnose. 8785 } else { 8786 // The tag name clashes with something else in the target scope, 8787 // issue an error and recover by making this tag be anonymous. 8788 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8789 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8790 Name = 0; 8791 Invalid = true; 8792 } 8793 8794 // The existing declaration isn't relevant to us; we're in a 8795 // new scope, so clear out the previous declaration. 8796 Previous.clear(); 8797 } 8798 } 8799 8800CreateNewDecl: 8801 8802 TagDecl *PrevDecl = 0; 8803 if (Previous.isSingleResult()) 8804 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8805 8806 // If there is an identifier, use the location of the identifier as the 8807 // location of the decl, otherwise use the location of the struct/union 8808 // keyword. 8809 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8810 8811 // Otherwise, create a new declaration. If there is a previous 8812 // declaration of the same entity, the two will be linked via 8813 // PrevDecl. 8814 TagDecl *New; 8815 8816 bool IsForwardReference = false; 8817 if (Kind == TTK_Enum) { 8818 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8819 // enum X { A, B, C } D; D should chain to X. 8820 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8821 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8822 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8823 // If this is an undefined enum, warn. 8824 if (TUK != TUK_Definition && !Invalid) { 8825 TagDecl *Def; 8826 if (getLangOpts().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8827 // C++0x: 7.2p2: opaque-enum-declaration. 8828 // Conflicts are diagnosed above. Do nothing. 8829 } 8830 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8831 Diag(Loc, diag::ext_forward_ref_enum_def) 8832 << New; 8833 Diag(Def->getLocation(), diag::note_previous_definition); 8834 } else { 8835 unsigned DiagID = diag::ext_forward_ref_enum; 8836 if (getLangOpts().MicrosoftMode) 8837 DiagID = diag::ext_ms_forward_ref_enum; 8838 else if (getLangOpts().CPlusPlus) 8839 DiagID = diag::err_forward_ref_enum; 8840 Diag(Loc, DiagID); 8841 8842 // If this is a forward-declared reference to an enumeration, make a 8843 // note of it; we won't actually be introducing the declaration into 8844 // the declaration context. 8845 if (TUK == TUK_Reference) 8846 IsForwardReference = true; 8847 } 8848 } 8849 8850 if (EnumUnderlying) { 8851 EnumDecl *ED = cast<EnumDecl>(New); 8852 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8853 ED->setIntegerTypeSourceInfo(TI); 8854 else 8855 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8856 ED->setPromotionType(ED->getIntegerType()); 8857 } 8858 8859 } else { 8860 // struct/union/class 8861 8862 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8863 // struct X { int A; } D; D should chain to X. 8864 if (getLangOpts().CPlusPlus) { 8865 // FIXME: Look for a way to use RecordDecl for simple structs. 8866 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8867 cast_or_null<CXXRecordDecl>(PrevDecl)); 8868 8869 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8870 StdBadAlloc = cast<CXXRecordDecl>(New); 8871 } else 8872 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8873 cast_or_null<RecordDecl>(PrevDecl)); 8874 } 8875 8876 // Maybe add qualifier info. 8877 if (SS.isNotEmpty()) { 8878 if (SS.isSet()) { 8879 // If this is either a declaration or a definition, check the 8880 // nested-name-specifier against the current context. We don't do this 8881 // for explicit specializations, because they have similar checking 8882 // (with more specific diagnostics) in the call to 8883 // CheckMemberSpecialization, below. 8884 if (!isExplicitSpecialization && 8885 (TUK == TUK_Definition || TUK == TUK_Declaration) && 8886 diagnoseQualifiedDeclaration(SS, DC, OrigName, NameLoc)) 8887 Invalid = true; 8888 8889 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8890 if (TemplateParameterLists.size() > 0) { 8891 New->setTemplateParameterListsInfo(Context, 8892 TemplateParameterLists.size(), 8893 TemplateParameterLists.data()); 8894 } 8895 } 8896 else 8897 Invalid = true; 8898 } 8899 8900 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8901 // Add alignment attributes if necessary; these attributes are checked when 8902 // the ASTContext lays out the structure. 8903 // 8904 // It is important for implementing the correct semantics that this 8905 // happen here (in act on tag decl). The #pragma pack stack is 8906 // maintained as a result of parser callbacks which can occur at 8907 // many points during the parsing of a struct declaration (because 8908 // the #pragma tokens are effectively skipped over during the 8909 // parsing of the struct). 8910 if (TUK == TUK_Definition) { 8911 AddAlignmentAttributesForRecord(RD); 8912 AddMsStructLayoutForRecord(RD); 8913 } 8914 } 8915 8916 if (ModulePrivateLoc.isValid()) { 8917 if (isExplicitSpecialization) 8918 Diag(New->getLocation(), diag::err_module_private_specialization) 8919 << 2 8920 << FixItHint::CreateRemoval(ModulePrivateLoc); 8921 // __module_private__ does not apply to local classes. However, we only 8922 // diagnose this as an error when the declaration specifiers are 8923 // freestanding. Here, we just ignore the __module_private__. 8924 else if (!SearchDC->isFunctionOrMethod()) 8925 New->setModulePrivate(); 8926 } 8927 8928 // If this is a specialization of a member class (of a class template), 8929 // check the specialization. 8930 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8931 Invalid = true; 8932 8933 if (Invalid) 8934 New->setInvalidDecl(); 8935 8936 if (Attr) 8937 ProcessDeclAttributeList(S, New, Attr); 8938 8939 // If we're declaring or defining a tag in function prototype scope 8940 // in C, note that this type can only be used within the function. 8941 if (Name && S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus) 8942 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8943 8944 // Set the lexical context. If the tag has a C++ scope specifier, the 8945 // lexical context will be different from the semantic context. 8946 New->setLexicalDeclContext(CurContext); 8947 8948 // Mark this as a friend decl if applicable. 8949 // In Microsoft mode, a friend declaration also acts as a forward 8950 // declaration so we always pass true to setObjectOfFriendDecl to make 8951 // the tag name visible. 8952 if (TUK == TUK_Friend) 8953 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8954 getLangOpts().MicrosoftExt); 8955 8956 // Set the access specifier. 8957 if (!Invalid && SearchDC->isRecord()) 8958 SetMemberAccessSpecifier(New, PrevDecl, AS); 8959 8960 if (TUK == TUK_Definition) 8961 New->startDefinition(); 8962 8963 // If this has an identifier, add it to the scope stack. 8964 if (TUK == TUK_Friend) { 8965 // We might be replacing an existing declaration in the lookup tables; 8966 // if so, borrow its access specifier. 8967 if (PrevDecl) 8968 New->setAccess(PrevDecl->getAccess()); 8969 8970 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8971 DC->makeDeclVisibleInContext(New); 8972 if (Name) // can be null along some error paths 8973 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8974 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8975 } else if (Name) { 8976 S = getNonFieldDeclScope(S); 8977 PushOnScopeChains(New, S, !IsForwardReference); 8978 if (IsForwardReference) 8979 SearchDC->makeDeclVisibleInContext(New); 8980 8981 } else { 8982 CurContext->addDecl(New); 8983 } 8984 8985 // If this is the C FILE type, notify the AST context. 8986 if (IdentifierInfo *II = New->getIdentifier()) 8987 if (!New->isInvalidDecl() && 8988 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8989 II->isStr("FILE")) 8990 Context.setFILEDecl(New); 8991 8992 // If we were in function prototype scope (and not in C++ mode), add this 8993 // tag to the list of decls to inject into the function definition scope. 8994 if (S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus && 8995 InFunctionDeclarator && Name) 8996 DeclsInPrototypeScope.push_back(New); 8997 8998 if (PrevDecl) 8999 mergeDeclAttributes(New, PrevDecl); 9000 9001 // If there's a #pragma GCC visibility in scope, set the visibility of this 9002 // record. 9003 AddPushedVisibilityAttribute(New); 9004 9005 OwnedDecl = true; 9006 return New; 9007} 9008 9009void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 9010 AdjustDeclIfTemplate(TagD); 9011 TagDecl *Tag = cast<TagDecl>(TagD); 9012 9013 // Enter the tag context. 9014 PushDeclContext(S, Tag); 9015 9016 ActOnDocumentableDecl(TagD); 9017 9018 // If there's a #pragma GCC visibility in scope, set the visibility of this 9019 // record. 9020 AddPushedVisibilityAttribute(Tag); 9021} 9022 9023Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 9024 assert(isa<ObjCContainerDecl>(IDecl) && 9025 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 9026 DeclContext *OCD = cast<DeclContext>(IDecl); 9027 assert(getContainingDC(OCD) == CurContext && 9028 "The next DeclContext should be lexically contained in the current one."); 9029 CurContext = OCD; 9030 return IDecl; 9031} 9032 9033void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 9034 SourceLocation FinalLoc, 9035 SourceLocation LBraceLoc) { 9036 AdjustDeclIfTemplate(TagD); 9037 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 9038 9039 FieldCollector->StartClass(); 9040 9041 if (!Record->getIdentifier()) 9042 return; 9043 9044 if (FinalLoc.isValid()) 9045 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 9046 9047 // C++ [class]p2: 9048 // [...] The class-name is also inserted into the scope of the 9049 // class itself; this is known as the injected-class-name. For 9050 // purposes of access checking, the injected-class-name is treated 9051 // as if it were a public member name. 9052 CXXRecordDecl *InjectedClassName 9053 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 9054 Record->getLocStart(), Record->getLocation(), 9055 Record->getIdentifier(), 9056 /*PrevDecl=*/0, 9057 /*DelayTypeCreation=*/true); 9058 Context.getTypeDeclType(InjectedClassName, Record); 9059 InjectedClassName->setImplicit(); 9060 InjectedClassName->setAccess(AS_public); 9061 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 9062 InjectedClassName->setDescribedClassTemplate(Template); 9063 PushOnScopeChains(InjectedClassName, S); 9064 assert(InjectedClassName->isInjectedClassName() && 9065 "Broken injected-class-name"); 9066} 9067 9068void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 9069 SourceLocation RBraceLoc) { 9070 AdjustDeclIfTemplate(TagD); 9071 TagDecl *Tag = cast<TagDecl>(TagD); 9072 Tag->setRBraceLoc(RBraceLoc); 9073 9074 // Make sure we "complete" the definition even it is invalid. 9075 if (Tag->isBeingDefined()) { 9076 assert(Tag->isInvalidDecl() && "We should already have completed it"); 9077 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 9078 RD->completeDefinition(); 9079 } 9080 9081 if (isa<CXXRecordDecl>(Tag)) 9082 FieldCollector->FinishClass(); 9083 9084 // Exit this scope of this tag's definition. 9085 PopDeclContext(); 9086 9087 // Notify the consumer that we've defined a tag. 9088 Consumer.HandleTagDeclDefinition(Tag); 9089} 9090 9091void Sema::ActOnObjCContainerFinishDefinition() { 9092 // Exit this scope of this interface definition. 9093 PopDeclContext(); 9094} 9095 9096void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 9097 assert(DC == CurContext && "Mismatch of container contexts"); 9098 OriginalLexicalContext = DC; 9099 ActOnObjCContainerFinishDefinition(); 9100} 9101 9102void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 9103 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 9104 OriginalLexicalContext = 0; 9105} 9106 9107void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 9108 AdjustDeclIfTemplate(TagD); 9109 TagDecl *Tag = cast<TagDecl>(TagD); 9110 Tag->setInvalidDecl(); 9111 9112 // Make sure we "complete" the definition even it is invalid. 9113 if (Tag->isBeingDefined()) { 9114 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 9115 RD->completeDefinition(); 9116 } 9117 9118 // We're undoing ActOnTagStartDefinition here, not 9119 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 9120 // the FieldCollector. 9121 9122 PopDeclContext(); 9123} 9124 9125// Note that FieldName may be null for anonymous bitfields. 9126ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 9127 IdentifierInfo *FieldName, 9128 QualType FieldTy, Expr *BitWidth, 9129 bool *ZeroWidth) { 9130 // Default to true; that shouldn't confuse checks for emptiness 9131 if (ZeroWidth) 9132 *ZeroWidth = true; 9133 9134 // C99 6.7.2.1p4 - verify the field type. 9135 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 9136 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 9137 // Handle incomplete types with specific error. 9138 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 9139 return ExprError(); 9140 if (FieldName) 9141 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 9142 << FieldName << FieldTy << BitWidth->getSourceRange(); 9143 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 9144 << FieldTy << BitWidth->getSourceRange(); 9145 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 9146 UPPC_BitFieldWidth)) 9147 return ExprError(); 9148 9149 // If the bit-width is type- or value-dependent, don't try to check 9150 // it now. 9151 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 9152 return Owned(BitWidth); 9153 9154 llvm::APSInt Value; 9155 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 9156 if (ICE.isInvalid()) 9157 return ICE; 9158 BitWidth = ICE.take(); 9159 9160 if (Value != 0 && ZeroWidth) 9161 *ZeroWidth = false; 9162 9163 // Zero-width bitfield is ok for anonymous field. 9164 if (Value == 0 && FieldName) 9165 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 9166 9167 if (Value.isSigned() && Value.isNegative()) { 9168 if (FieldName) 9169 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 9170 << FieldName << Value.toString(10); 9171 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 9172 << Value.toString(10); 9173 } 9174 9175 if (!FieldTy->isDependentType()) { 9176 uint64_t TypeSize = Context.getTypeSize(FieldTy); 9177 if (Value.getZExtValue() > TypeSize) { 9178 if (!getLangOpts().CPlusPlus) { 9179 if (FieldName) 9180 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 9181 << FieldName << (unsigned)Value.getZExtValue() 9182 << (unsigned)TypeSize; 9183 9184 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 9185 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 9186 } 9187 9188 if (FieldName) 9189 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 9190 << FieldName << (unsigned)Value.getZExtValue() 9191 << (unsigned)TypeSize; 9192 else 9193 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 9194 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 9195 } 9196 } 9197 9198 return Owned(BitWidth); 9199} 9200 9201/// ActOnField - Each field of a C struct/union is passed into this in order 9202/// to create a FieldDecl object for it. 9203Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 9204 Declarator &D, Expr *BitfieldWidth) { 9205 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 9206 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 9207 /*InitStyle=*/ICIS_NoInit, AS_public); 9208 return Res; 9209} 9210 9211/// HandleField - Analyze a field of a C struct or a C++ data member. 9212/// 9213FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 9214 SourceLocation DeclStart, 9215 Declarator &D, Expr *BitWidth, 9216 InClassInitStyle InitStyle, 9217 AccessSpecifier AS) { 9218 IdentifierInfo *II = D.getIdentifier(); 9219 SourceLocation Loc = DeclStart; 9220 if (II) Loc = D.getIdentifierLoc(); 9221 9222 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9223 QualType T = TInfo->getType(); 9224 if (getLangOpts().CPlusPlus) { 9225 CheckExtraCXXDefaultArguments(D); 9226 9227 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9228 UPPC_DataMemberType)) { 9229 D.setInvalidType(); 9230 T = Context.IntTy; 9231 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 9232 } 9233 } 9234 9235 DiagnoseFunctionSpecifiers(D); 9236 9237 if (D.getDeclSpec().isThreadSpecified()) 9238 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 9239 if (D.getDeclSpec().isConstexprSpecified()) 9240 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 9241 << 2; 9242 9243 // Check to see if this name was declared as a member previously 9244 NamedDecl *PrevDecl = 0; 9245 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 9246 LookupName(Previous, S); 9247 switch (Previous.getResultKind()) { 9248 case LookupResult::Found: 9249 case LookupResult::FoundUnresolvedValue: 9250 PrevDecl = Previous.getAsSingle<NamedDecl>(); 9251 break; 9252 9253 case LookupResult::FoundOverloaded: 9254 PrevDecl = Previous.getRepresentativeDecl(); 9255 break; 9256 9257 case LookupResult::NotFound: 9258 case LookupResult::NotFoundInCurrentInstantiation: 9259 case LookupResult::Ambiguous: 9260 break; 9261 } 9262 Previous.suppressDiagnostics(); 9263 9264 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9265 // Maybe we will complain about the shadowed template parameter. 9266 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9267 // Just pretend that we didn't see the previous declaration. 9268 PrevDecl = 0; 9269 } 9270 9271 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 9272 PrevDecl = 0; 9273 9274 bool Mutable 9275 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 9276 SourceLocation TSSL = D.getLocStart(); 9277 FieldDecl *NewFD 9278 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, InitStyle, 9279 TSSL, AS, PrevDecl, &D); 9280 9281 if (NewFD->isInvalidDecl()) 9282 Record->setInvalidDecl(); 9283 9284 if (D.getDeclSpec().isModulePrivateSpecified()) 9285 NewFD->setModulePrivate(); 9286 9287 if (NewFD->isInvalidDecl() && PrevDecl) { 9288 // Don't introduce NewFD into scope; there's already something 9289 // with the same name in the same scope. 9290 } else if (II) { 9291 PushOnScopeChains(NewFD, S); 9292 } else 9293 Record->addDecl(NewFD); 9294 9295 return NewFD; 9296} 9297 9298/// \brief Build a new FieldDecl and check its well-formedness. 9299/// 9300/// This routine builds a new FieldDecl given the fields name, type, 9301/// record, etc. \p PrevDecl should refer to any previous declaration 9302/// with the same name and in the same scope as the field to be 9303/// created. 9304/// 9305/// \returns a new FieldDecl. 9306/// 9307/// \todo The Declarator argument is a hack. It will be removed once 9308FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 9309 TypeSourceInfo *TInfo, 9310 RecordDecl *Record, SourceLocation Loc, 9311 bool Mutable, Expr *BitWidth, 9312 InClassInitStyle InitStyle, 9313 SourceLocation TSSL, 9314 AccessSpecifier AS, NamedDecl *PrevDecl, 9315 Declarator *D) { 9316 IdentifierInfo *II = Name.getAsIdentifierInfo(); 9317 bool InvalidDecl = false; 9318 if (D) InvalidDecl = D->isInvalidType(); 9319 9320 // If we receive a broken type, recover by assuming 'int' and 9321 // marking this declaration as invalid. 9322 if (T.isNull()) { 9323 InvalidDecl = true; 9324 T = Context.IntTy; 9325 } 9326 9327 QualType EltTy = Context.getBaseElementType(T); 9328 if (!EltTy->isDependentType()) { 9329 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 9330 // Fields of incomplete type force their record to be invalid. 9331 Record->setInvalidDecl(); 9332 InvalidDecl = true; 9333 } else { 9334 NamedDecl *Def; 9335 EltTy->isIncompleteType(&Def); 9336 if (Def && Def->isInvalidDecl()) { 9337 Record->setInvalidDecl(); 9338 InvalidDecl = true; 9339 } 9340 } 9341 } 9342 9343 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9344 // than a variably modified type. 9345 if (!InvalidDecl && T->isVariablyModifiedType()) { 9346 bool SizeIsNegative; 9347 llvm::APSInt Oversized; 9348 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 9349 SizeIsNegative, 9350 Oversized); 9351 if (!FixedTy.isNull()) { 9352 Diag(Loc, diag::warn_illegal_constant_array_size); 9353 T = FixedTy; 9354 } else { 9355 if (SizeIsNegative) 9356 Diag(Loc, diag::err_typecheck_negative_array_size); 9357 else if (Oversized.getBoolValue()) 9358 Diag(Loc, diag::err_array_too_large) 9359 << Oversized.toString(10); 9360 else 9361 Diag(Loc, diag::err_typecheck_field_variable_size); 9362 InvalidDecl = true; 9363 } 9364 } 9365 9366 // Fields can not have abstract class types 9367 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 9368 diag::err_abstract_type_in_decl, 9369 AbstractFieldType)) 9370 InvalidDecl = true; 9371 9372 bool ZeroWidth = false; 9373 // If this is declared as a bit-field, check the bit-field. 9374 if (!InvalidDecl && BitWidth) { 9375 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 9376 if (!BitWidth) { 9377 InvalidDecl = true; 9378 BitWidth = 0; 9379 ZeroWidth = false; 9380 } 9381 } 9382 9383 // Check that 'mutable' is consistent with the type of the declaration. 9384 if (!InvalidDecl && Mutable) { 9385 unsigned DiagID = 0; 9386 if (T->isReferenceType()) 9387 DiagID = diag::err_mutable_reference; 9388 else if (T.isConstQualified()) 9389 DiagID = diag::err_mutable_const; 9390 9391 if (DiagID) { 9392 SourceLocation ErrLoc = Loc; 9393 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 9394 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 9395 Diag(ErrLoc, DiagID); 9396 Mutable = false; 9397 InvalidDecl = true; 9398 } 9399 } 9400 9401 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 9402 BitWidth, Mutable, InitStyle); 9403 if (InvalidDecl) 9404 NewFD->setInvalidDecl(); 9405 9406 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 9407 Diag(Loc, diag::err_duplicate_member) << II; 9408 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9409 NewFD->setInvalidDecl(); 9410 } 9411 9412 if (!InvalidDecl && getLangOpts().CPlusPlus) { 9413 if (Record->isUnion()) { 9414 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9415 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9416 if (RDecl->getDefinition()) { 9417 // C++ [class.union]p1: An object of a class with a non-trivial 9418 // constructor, a non-trivial copy constructor, a non-trivial 9419 // destructor, or a non-trivial copy assignment operator 9420 // cannot be a member of a union, nor can an array of such 9421 // objects. 9422 if (CheckNontrivialField(NewFD)) 9423 NewFD->setInvalidDecl(); 9424 } 9425 } 9426 9427 // C++ [class.union]p1: If a union contains a member of reference type, 9428 // the program is ill-formed. 9429 if (EltTy->isReferenceType()) { 9430 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 9431 << NewFD->getDeclName() << EltTy; 9432 NewFD->setInvalidDecl(); 9433 } 9434 } 9435 } 9436 9437 // FIXME: We need to pass in the attributes given an AST 9438 // representation, not a parser representation. 9439 if (D) 9440 // FIXME: What to pass instead of TUScope? 9441 ProcessDeclAttributes(TUScope, NewFD, *D); 9442 9443 // In auto-retain/release, infer strong retension for fields of 9444 // retainable type. 9445 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 9446 NewFD->setInvalidDecl(); 9447 9448 if (T.isObjCGCWeak()) 9449 Diag(Loc, diag::warn_attribute_weak_on_field); 9450 9451 NewFD->setAccess(AS); 9452 return NewFD; 9453} 9454 9455bool Sema::CheckNontrivialField(FieldDecl *FD) { 9456 assert(FD); 9457 assert(getLangOpts().CPlusPlus && "valid check only for C++"); 9458 9459 if (FD->isInvalidDecl()) 9460 return true; 9461 9462 QualType EltTy = Context.getBaseElementType(FD->getType()); 9463 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9464 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9465 if (RDecl->getDefinition()) { 9466 // We check for copy constructors before constructors 9467 // because otherwise we'll never get complaints about 9468 // copy constructors. 9469 9470 CXXSpecialMember member = CXXInvalid; 9471 if (!RDecl->hasTrivialCopyConstructor()) 9472 member = CXXCopyConstructor; 9473 else if (!RDecl->hasTrivialDefaultConstructor()) 9474 member = CXXDefaultConstructor; 9475 else if (!RDecl->hasTrivialCopyAssignment()) 9476 member = CXXCopyAssignment; 9477 else if (!RDecl->hasTrivialDestructor()) 9478 member = CXXDestructor; 9479 9480 if (member != CXXInvalid) { 9481 if (!getLangOpts().CPlusPlus0x && 9482 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) { 9483 // Objective-C++ ARC: it is an error to have a non-trivial field of 9484 // a union. However, system headers in Objective-C programs 9485 // occasionally have Objective-C lifetime objects within unions, 9486 // and rather than cause the program to fail, we make those 9487 // members unavailable. 9488 SourceLocation Loc = FD->getLocation(); 9489 if (getSourceManager().isInSystemHeader(Loc)) { 9490 if (!FD->hasAttr<UnavailableAttr>()) 9491 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 9492 "this system field has retaining ownership")); 9493 return false; 9494 } 9495 } 9496 9497 Diag(FD->getLocation(), getLangOpts().CPlusPlus0x ? 9498 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 9499 diag::err_illegal_union_or_anon_struct_member) 9500 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 9501 DiagnoseNontrivial(RT, member); 9502 return !getLangOpts().CPlusPlus0x; 9503 } 9504 } 9505 } 9506 9507 return false; 9508} 9509 9510/// If the given constructor is user-provided, produce a diagnostic explaining 9511/// that it makes the class non-trivial. 9512static bool DiagnoseNontrivialUserProvidedCtor(Sema &S, QualType QT, 9513 CXXConstructorDecl *CD, 9514 Sema::CXXSpecialMember CSM) { 9515 if (!CD->isUserProvided()) 9516 return false; 9517 9518 SourceLocation CtorLoc = CD->getLocation(); 9519 S.Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << CSM; 9520 return true; 9521} 9522 9523/// DiagnoseNontrivial - Given that a class has a non-trivial 9524/// special member, figure out why. 9525void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 9526 QualType QT(T, 0U); 9527 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 9528 9529 // Check whether the member was user-declared. 9530 switch (member) { 9531 case CXXInvalid: 9532 break; 9533 9534 case CXXDefaultConstructor: 9535 if (RD->hasUserDeclaredConstructor()) { 9536 typedef CXXRecordDecl::ctor_iterator ctor_iter; 9537 for (ctor_iter CI = RD->ctor_begin(), CE = RD->ctor_end(); CI != CE; ++CI) 9538 if (DiagnoseNontrivialUserProvidedCtor(*this, QT, *CI, member)) 9539 return; 9540 9541 // No user-provided constructors; look for constructor templates. 9542 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 9543 tmpl_iter; 9544 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); 9545 TI != TE; ++TI) { 9546 CXXConstructorDecl *CD = 9547 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()); 9548 if (CD && DiagnoseNontrivialUserProvidedCtor(*this, QT, CD, member)) 9549 return; 9550 } 9551 } 9552 break; 9553 9554 case CXXCopyConstructor: 9555 if (RD->hasUserDeclaredCopyConstructor()) { 9556 SourceLocation CtorLoc = 9557 RD->getCopyConstructor(0)->getLocation(); 9558 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9559 return; 9560 } 9561 break; 9562 9563 case CXXMoveConstructor: 9564 if (RD->hasUserDeclaredMoveConstructor()) { 9565 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 9566 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9567 return; 9568 } 9569 break; 9570 9571 case CXXCopyAssignment: 9572 if (RD->hasUserDeclaredCopyAssignment()) { 9573 SourceLocation AssignLoc = 9574 RD->getCopyAssignmentOperator(0)->getLocation(); 9575 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9576 return; 9577 } 9578 break; 9579 9580 case CXXMoveAssignment: 9581 if (RD->hasUserDeclaredMoveAssignment()) { 9582 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 9583 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9584 return; 9585 } 9586 break; 9587 9588 case CXXDestructor: 9589 if (RD->hasUserDeclaredDestructor()) { 9590 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 9591 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9592 return; 9593 } 9594 break; 9595 } 9596 9597 typedef CXXRecordDecl::base_class_iterator base_iter; 9598 9599 // Virtual bases and members inhibit trivial copying/construction, 9600 // but not trivial destruction. 9601 if (member != CXXDestructor) { 9602 // Check for virtual bases. vbases includes indirect virtual bases, 9603 // so we just iterate through the direct bases. 9604 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 9605 if (bi->isVirtual()) { 9606 SourceLocation BaseLoc = bi->getLocStart(); 9607 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 9608 return; 9609 } 9610 9611 // Check for virtual methods. 9612 typedef CXXRecordDecl::method_iterator meth_iter; 9613 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 9614 ++mi) { 9615 if (mi->isVirtual()) { 9616 SourceLocation MLoc = mi->getLocStart(); 9617 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 9618 return; 9619 } 9620 } 9621 } 9622 9623 bool (CXXRecordDecl::*hasTrivial)() const; 9624 switch (member) { 9625 case CXXDefaultConstructor: 9626 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 9627 case CXXCopyConstructor: 9628 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 9629 case CXXCopyAssignment: 9630 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 9631 case CXXDestructor: 9632 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 9633 default: 9634 llvm_unreachable("unexpected special member"); 9635 } 9636 9637 // Check for nontrivial bases (and recurse). 9638 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 9639 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 9640 assert(BaseRT && "Don't know how to handle dependent bases"); 9641 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 9642 if (!(BaseRecTy->*hasTrivial)()) { 9643 SourceLocation BaseLoc = bi->getLocStart(); 9644 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 9645 DiagnoseNontrivial(BaseRT, member); 9646 return; 9647 } 9648 } 9649 9650 // Check for nontrivial members (and recurse). 9651 typedef RecordDecl::field_iterator field_iter; 9652 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 9653 ++fi) { 9654 QualType EltTy = Context.getBaseElementType(fi->getType()); 9655 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 9656 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 9657 9658 if (!(EltRD->*hasTrivial)()) { 9659 SourceLocation FLoc = fi->getLocation(); 9660 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 9661 DiagnoseNontrivial(EltRT, member); 9662 return; 9663 } 9664 } 9665 9666 if (EltTy->isObjCLifetimeType()) { 9667 switch (EltTy.getObjCLifetime()) { 9668 case Qualifiers::OCL_None: 9669 case Qualifiers::OCL_ExplicitNone: 9670 break; 9671 9672 case Qualifiers::OCL_Autoreleasing: 9673 case Qualifiers::OCL_Weak: 9674 case Qualifiers::OCL_Strong: 9675 Diag(fi->getLocation(), diag::note_nontrivial_objc_ownership) 9676 << QT << EltTy.getObjCLifetime(); 9677 return; 9678 } 9679 } 9680 } 9681 9682 llvm_unreachable("found no explanation for non-trivial member"); 9683} 9684 9685/// TranslateIvarVisibility - Translate visibility from a token ID to an 9686/// AST enum value. 9687static ObjCIvarDecl::AccessControl 9688TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9689 switch (ivarVisibility) { 9690 default: llvm_unreachable("Unknown visitibility kind"); 9691 case tok::objc_private: return ObjCIvarDecl::Private; 9692 case tok::objc_public: return ObjCIvarDecl::Public; 9693 case tok::objc_protected: return ObjCIvarDecl::Protected; 9694 case tok::objc_package: return ObjCIvarDecl::Package; 9695 } 9696} 9697 9698/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9699/// in order to create an IvarDecl object for it. 9700Decl *Sema::ActOnIvar(Scope *S, 9701 SourceLocation DeclStart, 9702 Declarator &D, Expr *BitfieldWidth, 9703 tok::ObjCKeywordKind Visibility) { 9704 9705 IdentifierInfo *II = D.getIdentifier(); 9706 Expr *BitWidth = (Expr*)BitfieldWidth; 9707 SourceLocation Loc = DeclStart; 9708 if (II) Loc = D.getIdentifierLoc(); 9709 9710 // FIXME: Unnamed fields can be handled in various different ways, for 9711 // example, unnamed unions inject all members into the struct namespace! 9712 9713 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9714 QualType T = TInfo->getType(); 9715 9716 if (BitWidth) { 9717 // 6.7.2.1p3, 6.7.2.1p4 9718 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9719 if (!BitWidth) 9720 D.setInvalidType(); 9721 } else { 9722 // Not a bitfield. 9723 9724 // validate II. 9725 9726 } 9727 if (T->isReferenceType()) { 9728 Diag(Loc, diag::err_ivar_reference_type); 9729 D.setInvalidType(); 9730 } 9731 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9732 // than a variably modified type. 9733 else if (T->isVariablyModifiedType()) { 9734 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9735 D.setInvalidType(); 9736 } 9737 9738 // Get the visibility (access control) for this ivar. 9739 ObjCIvarDecl::AccessControl ac = 9740 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9741 : ObjCIvarDecl::None; 9742 // Must set ivar's DeclContext to its enclosing interface. 9743 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9744 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9745 return 0; 9746 ObjCContainerDecl *EnclosingContext; 9747 if (ObjCImplementationDecl *IMPDecl = 9748 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9749 if (LangOpts.ObjCRuntime.isFragile()) { 9750 // Case of ivar declared in an implementation. Context is that of its class. 9751 EnclosingContext = IMPDecl->getClassInterface(); 9752 assert(EnclosingContext && "Implementation has no class interface!"); 9753 } 9754 else 9755 EnclosingContext = EnclosingDecl; 9756 } else { 9757 if (ObjCCategoryDecl *CDecl = 9758 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9759 if (LangOpts.ObjCRuntime.isFragile() || !CDecl->IsClassExtension()) { 9760 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9761 return 0; 9762 } 9763 } 9764 EnclosingContext = EnclosingDecl; 9765 } 9766 9767 // Construct the decl. 9768 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9769 DeclStart, Loc, II, T, 9770 TInfo, ac, (Expr *)BitfieldWidth); 9771 9772 if (II) { 9773 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9774 ForRedeclaration); 9775 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9776 && !isa<TagDecl>(PrevDecl)) { 9777 Diag(Loc, diag::err_duplicate_member) << II; 9778 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9779 NewID->setInvalidDecl(); 9780 } 9781 } 9782 9783 // Process attributes attached to the ivar. 9784 ProcessDeclAttributes(S, NewID, D); 9785 9786 if (D.isInvalidType()) 9787 NewID->setInvalidDecl(); 9788 9789 // In ARC, infer 'retaining' for ivars of retainable type. 9790 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9791 NewID->setInvalidDecl(); 9792 9793 if (D.getDeclSpec().isModulePrivateSpecified()) 9794 NewID->setModulePrivate(); 9795 9796 if (II) { 9797 // FIXME: When interfaces are DeclContexts, we'll need to add 9798 // these to the interface. 9799 S->AddDecl(NewID); 9800 IdResolver.AddDecl(NewID); 9801 } 9802 9803 if (LangOpts.ObjCRuntime.isNonFragile() && 9804 !NewID->isInvalidDecl() && isa<ObjCInterfaceDecl>(EnclosingDecl)) 9805 Diag(Loc, diag::warn_ivars_in_interface); 9806 9807 return NewID; 9808} 9809 9810/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9811/// class and class extensions. For every class @interface and class 9812/// extension @interface, if the last ivar is a bitfield of any type, 9813/// then add an implicit `char :0` ivar to the end of that interface. 9814void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9815 SmallVectorImpl<Decl *> &AllIvarDecls) { 9816 if (LangOpts.ObjCRuntime.isFragile() || AllIvarDecls.empty()) 9817 return; 9818 9819 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9820 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9821 9822 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9823 return; 9824 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9825 if (!ID) { 9826 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9827 if (!CD->IsClassExtension()) 9828 return; 9829 } 9830 // No need to add this to end of @implementation. 9831 else 9832 return; 9833 } 9834 // All conditions are met. Add a new bitfield to the tail end of ivars. 9835 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9836 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9837 9838 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9839 DeclLoc, DeclLoc, 0, 9840 Context.CharTy, 9841 Context.getTrivialTypeSourceInfo(Context.CharTy, 9842 DeclLoc), 9843 ObjCIvarDecl::Private, BW, 9844 true); 9845 AllIvarDecls.push_back(Ivar); 9846} 9847 9848void Sema::ActOnFields(Scope* S, 9849 SourceLocation RecLoc, Decl *EnclosingDecl, 9850 llvm::ArrayRef<Decl *> Fields, 9851 SourceLocation LBrac, SourceLocation RBrac, 9852 AttributeList *Attr) { 9853 assert(EnclosingDecl && "missing record or interface decl"); 9854 9855 // If this is an Objective-C @implementation or category and we have 9856 // new fields here we should reset the layout of the interface since 9857 // it will now change. 9858 if (!Fields.empty() && isa<ObjCContainerDecl>(EnclosingDecl)) { 9859 ObjCContainerDecl *DC = cast<ObjCContainerDecl>(EnclosingDecl); 9860 switch (DC->getKind()) { 9861 default: break; 9862 case Decl::ObjCCategory: 9863 Context.ResetObjCLayout(cast<ObjCCategoryDecl>(DC)->getClassInterface()); 9864 break; 9865 case Decl::ObjCImplementation: 9866 Context. 9867 ResetObjCLayout(cast<ObjCImplementationDecl>(DC)->getClassInterface()); 9868 break; 9869 } 9870 } 9871 9872 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9873 9874 // Start counting up the number of named members; make sure to include 9875 // members of anonymous structs and unions in the total. 9876 unsigned NumNamedMembers = 0; 9877 if (Record) { 9878 for (RecordDecl::decl_iterator i = Record->decls_begin(), 9879 e = Record->decls_end(); i != e; i++) { 9880 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i)) 9881 if (IFD->getDeclName()) 9882 ++NumNamedMembers; 9883 } 9884 } 9885 9886 // Verify that all the fields are okay. 9887 SmallVector<FieldDecl*, 32> RecFields; 9888 9889 bool ARCErrReported = false; 9890 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9891 i != end; ++i) { 9892 FieldDecl *FD = cast<FieldDecl>(*i); 9893 9894 // Get the type for the field. 9895 const Type *FDTy = FD->getType().getTypePtr(); 9896 9897 if (!FD->isAnonymousStructOrUnion()) { 9898 // Remember all fields written by the user. 9899 RecFields.push_back(FD); 9900 } 9901 9902 // If the field is already invalid for some reason, don't emit more 9903 // diagnostics about it. 9904 if (FD->isInvalidDecl()) { 9905 EnclosingDecl->setInvalidDecl(); 9906 continue; 9907 } 9908 9909 // C99 6.7.2.1p2: 9910 // A structure or union shall not contain a member with 9911 // incomplete or function type (hence, a structure shall not 9912 // contain an instance of itself, but may contain a pointer to 9913 // an instance of itself), except that the last member of a 9914 // structure with more than one named member may have incomplete 9915 // array type; such a structure (and any union containing, 9916 // possibly recursively, a member that is such a structure) 9917 // shall not be a member of a structure or an element of an 9918 // array. 9919 if (FDTy->isFunctionType()) { 9920 // Field declared as a function. 9921 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9922 << FD->getDeclName(); 9923 FD->setInvalidDecl(); 9924 EnclosingDecl->setInvalidDecl(); 9925 continue; 9926 } else if (FDTy->isIncompleteArrayType() && Record && 9927 ((i + 1 == Fields.end() && !Record->isUnion()) || 9928 ((getLangOpts().MicrosoftExt || 9929 getLangOpts().CPlusPlus) && 9930 (i + 1 == Fields.end() || Record->isUnion())))) { 9931 // Flexible array member. 9932 // Microsoft and g++ is more permissive regarding flexible array. 9933 // It will accept flexible array in union and also 9934 // as the sole element of a struct/class. 9935 if (getLangOpts().MicrosoftExt) { 9936 if (Record->isUnion()) 9937 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9938 << FD->getDeclName(); 9939 else if (Fields.size() == 1) 9940 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9941 << FD->getDeclName() << Record->getTagKind(); 9942 } else if (getLangOpts().CPlusPlus) { 9943 if (Record->isUnion()) 9944 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9945 << FD->getDeclName(); 9946 else if (Fields.size() == 1) 9947 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9948 << FD->getDeclName() << Record->getTagKind(); 9949 } else if (!getLangOpts().C99) { 9950 if (Record->isUnion()) 9951 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9952 << FD->getDeclName(); 9953 else 9954 Diag(FD->getLocation(), diag::ext_c99_flexible_array_member) 9955 << FD->getDeclName() << Record->getTagKind(); 9956 } else if (NumNamedMembers < 1) { 9957 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9958 << FD->getDeclName(); 9959 FD->setInvalidDecl(); 9960 EnclosingDecl->setInvalidDecl(); 9961 continue; 9962 } 9963 if (!FD->getType()->isDependentType() && 9964 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9965 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9966 << FD->getDeclName() << FD->getType(); 9967 FD->setInvalidDecl(); 9968 EnclosingDecl->setInvalidDecl(); 9969 continue; 9970 } 9971 // Okay, we have a legal flexible array member at the end of the struct. 9972 if (Record) 9973 Record->setHasFlexibleArrayMember(true); 9974 } else if (!FDTy->isDependentType() && 9975 RequireCompleteType(FD->getLocation(), FD->getType(), 9976 diag::err_field_incomplete)) { 9977 // Incomplete type 9978 FD->setInvalidDecl(); 9979 EnclosingDecl->setInvalidDecl(); 9980 continue; 9981 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9982 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9983 // If this is a member of a union, then entire union becomes "flexible". 9984 if (Record && Record->isUnion()) { 9985 Record->setHasFlexibleArrayMember(true); 9986 } else { 9987 // If this is a struct/class and this is not the last element, reject 9988 // it. Note that GCC supports variable sized arrays in the middle of 9989 // structures. 9990 if (i + 1 != Fields.end()) 9991 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9992 << FD->getDeclName() << FD->getType(); 9993 else { 9994 // We support flexible arrays at the end of structs in 9995 // other structs as an extension. 9996 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9997 << FD->getDeclName(); 9998 if (Record) 9999 Record->setHasFlexibleArrayMember(true); 10000 } 10001 } 10002 } 10003 if (isa<ObjCContainerDecl>(EnclosingDecl) && 10004 RequireNonAbstractType(FD->getLocation(), FD->getType(), 10005 diag::err_abstract_type_in_decl, 10006 AbstractIvarType)) { 10007 // Ivars can not have abstract class types 10008 FD->setInvalidDecl(); 10009 } 10010 if (Record && FDTTy->getDecl()->hasObjectMember()) 10011 Record->setHasObjectMember(true); 10012 } else if (FDTy->isObjCObjectType()) { 10013 /// A field cannot be an Objective-c object 10014 Diag(FD->getLocation(), diag::err_statically_allocated_object) 10015 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 10016 QualType T = Context.getObjCObjectPointerType(FD->getType()); 10017 FD->setType(T); 10018 } else if (!getLangOpts().CPlusPlus) { 10019 if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported) { 10020 // It's an error in ARC if a field has lifetime. 10021 // We don't want to report this in a system header, though, 10022 // so we just make the field unavailable. 10023 // FIXME: that's really not sufficient; we need to make the type 10024 // itself invalid to, say, initialize or copy. 10025 QualType T = FD->getType(); 10026 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 10027 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 10028 SourceLocation loc = FD->getLocation(); 10029 if (getSourceManager().isInSystemHeader(loc)) { 10030 if (!FD->hasAttr<UnavailableAttr>()) { 10031 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 10032 "this system field has retaining ownership")); 10033 } 10034 } else { 10035 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 10036 << T->isBlockPointerType(); 10037 } 10038 ARCErrReported = true; 10039 } 10040 } 10041 else if (getLangOpts().ObjC1 && 10042 getLangOpts().getGC() != LangOptions::NonGC && 10043 Record && !Record->hasObjectMember()) { 10044 if (FD->getType()->isObjCObjectPointerType() || 10045 FD->getType().isObjCGCStrong()) 10046 Record->setHasObjectMember(true); 10047 else if (Context.getAsArrayType(FD->getType())) { 10048 QualType BaseType = Context.getBaseElementType(FD->getType()); 10049 if (BaseType->isRecordType() && 10050 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 10051 Record->setHasObjectMember(true); 10052 else if (BaseType->isObjCObjectPointerType() || 10053 BaseType.isObjCGCStrong()) 10054 Record->setHasObjectMember(true); 10055 } 10056 } 10057 } 10058 // Keep track of the number of named members. 10059 if (FD->getIdentifier()) 10060 ++NumNamedMembers; 10061 } 10062 10063 // Okay, we successfully defined 'Record'. 10064 if (Record) { 10065 bool Completed = false; 10066 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 10067 if (!CXXRecord->isInvalidDecl()) { 10068 // Set access bits correctly on the directly-declared conversions. 10069 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 10070 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 10071 I != E; ++I) 10072 Convs->setAccess(I, (*I)->getAccess()); 10073 10074 if (!CXXRecord->isDependentType()) { 10075 // Objective-C Automatic Reference Counting: 10076 // If a class has a non-static data member of Objective-C pointer 10077 // type (or array thereof), it is a non-POD type and its 10078 // default constructor (if any), copy constructor, copy assignment 10079 // operator, and destructor are non-trivial. 10080 // 10081 // This rule is also handled by CXXRecordDecl::completeDefinition(). 10082 // However, here we check whether this particular class is only 10083 // non-POD because of the presence of an Objective-C pointer member. 10084 // If so, objects of this type cannot be shared between code compiled 10085 // with ARC and code compiled with manual retain/release. 10086 if (getLangOpts().ObjCAutoRefCount && 10087 CXXRecord->hasObjectMember() && 10088 CXXRecord->getLinkage() == ExternalLinkage) { 10089 if (CXXRecord->isPOD()) { 10090 Diag(CXXRecord->getLocation(), 10091 diag::warn_arc_non_pod_class_with_object_member) 10092 << CXXRecord; 10093 } else { 10094 // FIXME: Fix-Its would be nice here, but finding a good location 10095 // for them is going to be tricky. 10096 if (CXXRecord->hasTrivialCopyConstructor()) 10097 Diag(CXXRecord->getLocation(), 10098 diag::warn_arc_trivial_member_function_with_object_member) 10099 << CXXRecord << 0; 10100 if (CXXRecord->hasTrivialCopyAssignment()) 10101 Diag(CXXRecord->getLocation(), 10102 diag::warn_arc_trivial_member_function_with_object_member) 10103 << CXXRecord << 1; 10104 if (CXXRecord->hasTrivialDestructor()) 10105 Diag(CXXRecord->getLocation(), 10106 diag::warn_arc_trivial_member_function_with_object_member) 10107 << CXXRecord << 2; 10108 } 10109 } 10110 10111 // Adjust user-defined destructor exception spec. 10112 if (getLangOpts().CPlusPlus0x && 10113 CXXRecord->hasUserDeclaredDestructor()) 10114 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 10115 10116 // Add any implicitly-declared members to this class. 10117 AddImplicitlyDeclaredMembersToClass(CXXRecord); 10118 10119 // If we have virtual base classes, we may end up finding multiple 10120 // final overriders for a given virtual function. Check for this 10121 // problem now. 10122 if (CXXRecord->getNumVBases()) { 10123 CXXFinalOverriderMap FinalOverriders; 10124 CXXRecord->getFinalOverriders(FinalOverriders); 10125 10126 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 10127 MEnd = FinalOverriders.end(); 10128 M != MEnd; ++M) { 10129 for (OverridingMethods::iterator SO = M->second.begin(), 10130 SOEnd = M->second.end(); 10131 SO != SOEnd; ++SO) { 10132 assert(SO->second.size() > 0 && 10133 "Virtual function without overridding functions?"); 10134 if (SO->second.size() == 1) 10135 continue; 10136 10137 // C++ [class.virtual]p2: 10138 // In a derived class, if a virtual member function of a base 10139 // class subobject has more than one final overrider the 10140 // program is ill-formed. 10141 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 10142 << (NamedDecl *)M->first << Record; 10143 Diag(M->first->getLocation(), 10144 diag::note_overridden_virtual_function); 10145 for (OverridingMethods::overriding_iterator 10146 OM = SO->second.begin(), 10147 OMEnd = SO->second.end(); 10148 OM != OMEnd; ++OM) 10149 Diag(OM->Method->getLocation(), diag::note_final_overrider) 10150 << (NamedDecl *)M->first << OM->Method->getParent(); 10151 10152 Record->setInvalidDecl(); 10153 } 10154 } 10155 CXXRecord->completeDefinition(&FinalOverriders); 10156 Completed = true; 10157 } 10158 } 10159 } 10160 } 10161 10162 if (!Completed) 10163 Record->completeDefinition(); 10164 10165 } else { 10166 ObjCIvarDecl **ClsFields = 10167 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 10168 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 10169 ID->setEndOfDefinitionLoc(RBrac); 10170 // Add ivar's to class's DeclContext. 10171 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 10172 ClsFields[i]->setLexicalDeclContext(ID); 10173 ID->addDecl(ClsFields[i]); 10174 } 10175 // Must enforce the rule that ivars in the base classes may not be 10176 // duplicates. 10177 if (ID->getSuperClass()) 10178 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 10179 } else if (ObjCImplementationDecl *IMPDecl = 10180 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 10181 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 10182 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 10183 // Ivar declared in @implementation never belongs to the implementation. 10184 // Only it is in implementation's lexical context. 10185 ClsFields[I]->setLexicalDeclContext(IMPDecl); 10186 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 10187 IMPDecl->setIvarLBraceLoc(LBrac); 10188 IMPDecl->setIvarRBraceLoc(RBrac); 10189 } else if (ObjCCategoryDecl *CDecl = 10190 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 10191 // case of ivars in class extension; all other cases have been 10192 // reported as errors elsewhere. 10193 // FIXME. Class extension does not have a LocEnd field. 10194 // CDecl->setLocEnd(RBrac); 10195 // Add ivar's to class extension's DeclContext. 10196 // Diagnose redeclaration of private ivars. 10197 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 10198 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 10199 if (IDecl) { 10200 if (const ObjCIvarDecl *ClsIvar = 10201 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 10202 Diag(ClsFields[i]->getLocation(), 10203 diag::err_duplicate_ivar_declaration); 10204 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 10205 continue; 10206 } 10207 for (const ObjCCategoryDecl *ClsExtDecl = 10208 IDecl->getFirstClassExtension(); 10209 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 10210 if (const ObjCIvarDecl *ClsExtIvar = 10211 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 10212 Diag(ClsFields[i]->getLocation(), 10213 diag::err_duplicate_ivar_declaration); 10214 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 10215 continue; 10216 } 10217 } 10218 } 10219 ClsFields[i]->setLexicalDeclContext(CDecl); 10220 CDecl->addDecl(ClsFields[i]); 10221 } 10222 CDecl->setIvarLBraceLoc(LBrac); 10223 CDecl->setIvarRBraceLoc(RBrac); 10224 } 10225 } 10226 10227 if (Attr) 10228 ProcessDeclAttributeList(S, Record, Attr); 10229} 10230 10231/// \brief Determine whether the given integral value is representable within 10232/// the given type T. 10233static bool isRepresentableIntegerValue(ASTContext &Context, 10234 llvm::APSInt &Value, 10235 QualType T) { 10236 assert(T->isIntegralType(Context) && "Integral type required!"); 10237 unsigned BitWidth = Context.getIntWidth(T); 10238 10239 if (Value.isUnsigned() || Value.isNonNegative()) { 10240 if (T->isSignedIntegerOrEnumerationType()) 10241 --BitWidth; 10242 return Value.getActiveBits() <= BitWidth; 10243 } 10244 return Value.getMinSignedBits() <= BitWidth; 10245} 10246 10247// \brief Given an integral type, return the next larger integral type 10248// (or a NULL type of no such type exists). 10249static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 10250 // FIXME: Int128/UInt128 support, which also needs to be introduced into 10251 // enum checking below. 10252 assert(T->isIntegralType(Context) && "Integral type required!"); 10253 const unsigned NumTypes = 4; 10254 QualType SignedIntegralTypes[NumTypes] = { 10255 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 10256 }; 10257 QualType UnsignedIntegralTypes[NumTypes] = { 10258 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 10259 Context.UnsignedLongLongTy 10260 }; 10261 10262 unsigned BitWidth = Context.getTypeSize(T); 10263 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 10264 : UnsignedIntegralTypes; 10265 for (unsigned I = 0; I != NumTypes; ++I) 10266 if (Context.getTypeSize(Types[I]) > BitWidth) 10267 return Types[I]; 10268 10269 return QualType(); 10270} 10271 10272EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 10273 EnumConstantDecl *LastEnumConst, 10274 SourceLocation IdLoc, 10275 IdentifierInfo *Id, 10276 Expr *Val) { 10277 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10278 llvm::APSInt EnumVal(IntWidth); 10279 QualType EltTy; 10280 10281 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 10282 Val = 0; 10283 10284 if (Val) 10285 Val = DefaultLvalueConversion(Val).take(); 10286 10287 if (Val) { 10288 if (Enum->isDependentType() || Val->isTypeDependent()) 10289 EltTy = Context.DependentTy; 10290 else { 10291 SourceLocation ExpLoc; 10292 if (getLangOpts().CPlusPlus0x && Enum->isFixed() && 10293 !getLangOpts().MicrosoftMode) { 10294 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 10295 // constant-expression in the enumerator-definition shall be a converted 10296 // constant expression of the underlying type. 10297 EltTy = Enum->getIntegerType(); 10298 ExprResult Converted = 10299 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 10300 CCEK_Enumerator); 10301 if (Converted.isInvalid()) 10302 Val = 0; 10303 else 10304 Val = Converted.take(); 10305 } else if (!Val->isValueDependent() && 10306 !(Val = VerifyIntegerConstantExpression(Val, 10307 &EnumVal).take())) { 10308 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 10309 } else { 10310 if (Enum->isFixed()) { 10311 EltTy = Enum->getIntegerType(); 10312 10313 // In Obj-C and Microsoft mode, require the enumeration value to be 10314 // representable in the underlying type of the enumeration. In C++11, 10315 // we perform a non-narrowing conversion as part of converted constant 10316 // expression checking. 10317 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10318 if (getLangOpts().MicrosoftMode) { 10319 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 10320 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10321 } else 10322 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 10323 } else 10324 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10325 } else if (getLangOpts().CPlusPlus) { 10326 // C++11 [dcl.enum]p5: 10327 // If the underlying type is not fixed, the type of each enumerator 10328 // is the type of its initializing value: 10329 // - If an initializer is specified for an enumerator, the 10330 // initializing value has the same type as the expression. 10331 EltTy = Val->getType(); 10332 } else { 10333 // C99 6.7.2.2p2: 10334 // The expression that defines the value of an enumeration constant 10335 // shall be an integer constant expression that has a value 10336 // representable as an int. 10337 10338 // Complain if the value is not representable in an int. 10339 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 10340 Diag(IdLoc, diag::ext_enum_value_not_int) 10341 << EnumVal.toString(10) << Val->getSourceRange() 10342 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 10343 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 10344 // Force the type of the expression to 'int'. 10345 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 10346 } 10347 EltTy = Val->getType(); 10348 } 10349 } 10350 } 10351 } 10352 10353 if (!Val) { 10354 if (Enum->isDependentType()) 10355 EltTy = Context.DependentTy; 10356 else if (!LastEnumConst) { 10357 // C++0x [dcl.enum]p5: 10358 // If the underlying type is not fixed, the type of each enumerator 10359 // is the type of its initializing value: 10360 // - If no initializer is specified for the first enumerator, the 10361 // initializing value has an unspecified integral type. 10362 // 10363 // GCC uses 'int' for its unspecified integral type, as does 10364 // C99 6.7.2.2p3. 10365 if (Enum->isFixed()) { 10366 EltTy = Enum->getIntegerType(); 10367 } 10368 else { 10369 EltTy = Context.IntTy; 10370 } 10371 } else { 10372 // Assign the last value + 1. 10373 EnumVal = LastEnumConst->getInitVal(); 10374 ++EnumVal; 10375 EltTy = LastEnumConst->getType(); 10376 10377 // Check for overflow on increment. 10378 if (EnumVal < LastEnumConst->getInitVal()) { 10379 // C++0x [dcl.enum]p5: 10380 // If the underlying type is not fixed, the type of each enumerator 10381 // is the type of its initializing value: 10382 // 10383 // - Otherwise the type of the initializing value is the same as 10384 // the type of the initializing value of the preceding enumerator 10385 // unless the incremented value is not representable in that type, 10386 // in which case the type is an unspecified integral type 10387 // sufficient to contain the incremented value. If no such type 10388 // exists, the program is ill-formed. 10389 QualType T = getNextLargerIntegralType(Context, EltTy); 10390 if (T.isNull() || Enum->isFixed()) { 10391 // There is no integral type larger enough to represent this 10392 // value. Complain, then allow the value to wrap around. 10393 EnumVal = LastEnumConst->getInitVal(); 10394 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 10395 ++EnumVal; 10396 if (Enum->isFixed()) 10397 // When the underlying type is fixed, this is ill-formed. 10398 Diag(IdLoc, diag::err_enumerator_wrapped) 10399 << EnumVal.toString(10) 10400 << EltTy; 10401 else 10402 Diag(IdLoc, diag::warn_enumerator_too_large) 10403 << EnumVal.toString(10); 10404 } else { 10405 EltTy = T; 10406 } 10407 10408 // Retrieve the last enumerator's value, extent that type to the 10409 // type that is supposed to be large enough to represent the incremented 10410 // value, then increment. 10411 EnumVal = LastEnumConst->getInitVal(); 10412 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10413 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 10414 ++EnumVal; 10415 10416 // If we're not in C++, diagnose the overflow of enumerator values, 10417 // which in C99 means that the enumerator value is not representable in 10418 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 10419 // permits enumerator values that are representable in some larger 10420 // integral type. 10421 if (!getLangOpts().CPlusPlus && !T.isNull()) 10422 Diag(IdLoc, diag::warn_enum_value_overflow); 10423 } else if (!getLangOpts().CPlusPlus && 10424 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10425 // Enforce C99 6.7.2.2p2 even when we compute the next value. 10426 Diag(IdLoc, diag::ext_enum_value_not_int) 10427 << EnumVal.toString(10) << 1; 10428 } 10429 } 10430 } 10431 10432 if (!EltTy->isDependentType()) { 10433 // Make the enumerator value match the signedness and size of the 10434 // enumerator's type. 10435 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); 10436 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10437 } 10438 10439 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 10440 Val, EnumVal); 10441} 10442 10443 10444Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 10445 SourceLocation IdLoc, IdentifierInfo *Id, 10446 AttributeList *Attr, 10447 SourceLocation EqualLoc, Expr *Val) { 10448 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 10449 EnumConstantDecl *LastEnumConst = 10450 cast_or_null<EnumConstantDecl>(lastEnumConst); 10451 10452 // The scope passed in may not be a decl scope. Zip up the scope tree until 10453 // we find one that is. 10454 S = getNonFieldDeclScope(S); 10455 10456 // Verify that there isn't already something declared with this name in this 10457 // scope. 10458 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 10459 ForRedeclaration); 10460 if (PrevDecl && PrevDecl->isTemplateParameter()) { 10461 // Maybe we will complain about the shadowed template parameter. 10462 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 10463 // Just pretend that we didn't see the previous declaration. 10464 PrevDecl = 0; 10465 } 10466 10467 if (PrevDecl) { 10468 // When in C++, we may get a TagDecl with the same name; in this case the 10469 // enum constant will 'hide' the tag. 10470 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 10471 "Received TagDecl when not in C++!"); 10472 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 10473 if (isa<EnumConstantDecl>(PrevDecl)) 10474 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 10475 else 10476 Diag(IdLoc, diag::err_redefinition) << Id; 10477 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 10478 return 0; 10479 } 10480 } 10481 10482 // C++ [class.mem]p15: 10483 // If T is the name of a class, then each of the following shall have a name 10484 // different from T: 10485 // - every enumerator of every member of class T that is an unscoped 10486 // enumerated type 10487 if (CXXRecordDecl *Record 10488 = dyn_cast<CXXRecordDecl>( 10489 TheEnumDecl->getDeclContext()->getRedeclContext())) 10490 if (!TheEnumDecl->isScoped() && 10491 Record->getIdentifier() && Record->getIdentifier() == Id) 10492 Diag(IdLoc, diag::err_member_name_of_class) << Id; 10493 10494 EnumConstantDecl *New = 10495 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 10496 10497 if (New) { 10498 // Process attributes. 10499 if (Attr) ProcessDeclAttributeList(S, New, Attr); 10500 10501 // Register this decl in the current scope stack. 10502 New->setAccess(TheEnumDecl->getAccess()); 10503 PushOnScopeChains(New, S); 10504 } 10505 10506 ActOnDocumentableDecl(New); 10507 10508 return New; 10509} 10510 10511// Emits a warning if every element in the enum is the same value and if 10512// every element is initialized with a integer or boolean literal. 10513static void CheckForUniqueEnumValues(Sema &S, Decl **Elements, 10514 unsigned NumElements, EnumDecl *Enum, 10515 QualType EnumType) { 10516 if (S.Diags.getDiagnosticLevel(diag::warn_identical_enum_values, 10517 Enum->getLocation()) == 10518 DiagnosticsEngine::Ignored) 10519 return; 10520 10521 if (NumElements < 2) 10522 return; 10523 10524 if (!Enum->getIdentifier()) 10525 return; 10526 10527 llvm::APSInt FirstVal; 10528 10529 for (unsigned i = 0; i != NumElements; ++i) { 10530 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10531 if (!ECD) 10532 return; 10533 10534 Expr *InitExpr = ECD->getInitExpr(); 10535 if (!InitExpr) 10536 return; 10537 InitExpr = InitExpr->IgnoreImpCasts(); 10538 if (!isa<IntegerLiteral>(InitExpr) && !isa<CXXBoolLiteralExpr>(InitExpr)) 10539 return; 10540 10541 if (i == 0) { 10542 FirstVal = ECD->getInitVal(); 10543 continue; 10544 } 10545 10546 if (!llvm::APSInt::isSameValue(FirstVal, ECD->getInitVal())) 10547 return; 10548 } 10549 10550 S.Diag(Enum->getLocation(), diag::warn_identical_enum_values) 10551 << EnumType << FirstVal.toString(10) 10552 << Enum->getSourceRange(); 10553 10554 EnumConstantDecl *Last = cast<EnumConstantDecl>(Elements[NumElements - 1]), 10555 *Next = cast<EnumConstantDecl>(Elements[NumElements - 2]); 10556 10557 S.Diag(Last->getLocation(), diag::note_identical_enum_values) 10558 << FixItHint::CreateReplacement(Last->getInitExpr()->getSourceRange(), 10559 Next->getName()); 10560} 10561 10562void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 10563 SourceLocation RBraceLoc, Decl *EnumDeclX, 10564 Decl **Elements, unsigned NumElements, 10565 Scope *S, AttributeList *Attr) { 10566 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 10567 QualType EnumType = Context.getTypeDeclType(Enum); 10568 10569 if (Attr) 10570 ProcessDeclAttributeList(S, Enum, Attr); 10571 10572 if (Enum->isDependentType()) { 10573 for (unsigned i = 0; i != NumElements; ++i) { 10574 EnumConstantDecl *ECD = 10575 cast_or_null<EnumConstantDecl>(Elements[i]); 10576 if (!ECD) continue; 10577 10578 ECD->setType(EnumType); 10579 } 10580 10581 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 10582 return; 10583 } 10584 10585 // TODO: If the result value doesn't fit in an int, it must be a long or long 10586 // long value. ISO C does not support this, but GCC does as an extension, 10587 // emit a warning. 10588 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10589 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 10590 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 10591 10592 // Verify that all the values are okay, compute the size of the values, and 10593 // reverse the list. 10594 unsigned NumNegativeBits = 0; 10595 unsigned NumPositiveBits = 0; 10596 10597 // Keep track of whether all elements have type int. 10598 bool AllElementsInt = true; 10599 10600 for (unsigned i = 0; i != NumElements; ++i) { 10601 EnumConstantDecl *ECD = 10602 cast_or_null<EnumConstantDecl>(Elements[i]); 10603 if (!ECD) continue; // Already issued a diagnostic. 10604 10605 const llvm::APSInt &InitVal = ECD->getInitVal(); 10606 10607 // Keep track of the size of positive and negative values. 10608 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 10609 NumPositiveBits = std::max(NumPositiveBits, 10610 (unsigned)InitVal.getActiveBits()); 10611 else 10612 NumNegativeBits = std::max(NumNegativeBits, 10613 (unsigned)InitVal.getMinSignedBits()); 10614 10615 // Keep track of whether every enum element has type int (very commmon). 10616 if (AllElementsInt) 10617 AllElementsInt = ECD->getType() == Context.IntTy; 10618 } 10619 10620 // Figure out the type that should be used for this enum. 10621 QualType BestType; 10622 unsigned BestWidth; 10623 10624 // C++0x N3000 [conv.prom]p3: 10625 // An rvalue of an unscoped enumeration type whose underlying 10626 // type is not fixed can be converted to an rvalue of the first 10627 // of the following types that can represent all the values of 10628 // the enumeration: int, unsigned int, long int, unsigned long 10629 // int, long long int, or unsigned long long int. 10630 // C99 6.4.4.3p2: 10631 // An identifier declared as an enumeration constant has type int. 10632 // The C99 rule is modified by a gcc extension 10633 QualType BestPromotionType; 10634 10635 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 10636 // -fshort-enums is the equivalent to specifying the packed attribute on all 10637 // enum definitions. 10638 if (LangOpts.ShortEnums) 10639 Packed = true; 10640 10641 if (Enum->isFixed()) { 10642 BestType = Enum->getIntegerType(); 10643 if (BestType->isPromotableIntegerType()) 10644 BestPromotionType = Context.getPromotedIntegerType(BestType); 10645 else 10646 BestPromotionType = BestType; 10647 // We don't need to set BestWidth, because BestType is going to be the type 10648 // of the enumerators, but we do anyway because otherwise some compilers 10649 // warn that it might be used uninitialized. 10650 BestWidth = CharWidth; 10651 } 10652 else if (NumNegativeBits) { 10653 // If there is a negative value, figure out the smallest integer type (of 10654 // int/long/longlong) that fits. 10655 // If it's packed, check also if it fits a char or a short. 10656 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 10657 BestType = Context.SignedCharTy; 10658 BestWidth = CharWidth; 10659 } else if (Packed && NumNegativeBits <= ShortWidth && 10660 NumPositiveBits < ShortWidth) { 10661 BestType = Context.ShortTy; 10662 BestWidth = ShortWidth; 10663 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 10664 BestType = Context.IntTy; 10665 BestWidth = IntWidth; 10666 } else { 10667 BestWidth = Context.getTargetInfo().getLongWidth(); 10668 10669 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 10670 BestType = Context.LongTy; 10671 } else { 10672 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10673 10674 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 10675 Diag(Enum->getLocation(), diag::warn_enum_too_large); 10676 BestType = Context.LongLongTy; 10677 } 10678 } 10679 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 10680 } else { 10681 // If there is no negative value, figure out the smallest type that fits 10682 // all of the enumerator values. 10683 // If it's packed, check also if it fits a char or a short. 10684 if (Packed && NumPositiveBits <= CharWidth) { 10685 BestType = Context.UnsignedCharTy; 10686 BestPromotionType = Context.IntTy; 10687 BestWidth = CharWidth; 10688 } else if (Packed && NumPositiveBits <= ShortWidth) { 10689 BestType = Context.UnsignedShortTy; 10690 BestPromotionType = Context.IntTy; 10691 BestWidth = ShortWidth; 10692 } else if (NumPositiveBits <= IntWidth) { 10693 BestType = Context.UnsignedIntTy; 10694 BestWidth = IntWidth; 10695 BestPromotionType 10696 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10697 ? Context.UnsignedIntTy : Context.IntTy; 10698 } else if (NumPositiveBits <= 10699 (BestWidth = Context.getTargetInfo().getLongWidth())) { 10700 BestType = Context.UnsignedLongTy; 10701 BestPromotionType 10702 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10703 ? Context.UnsignedLongTy : Context.LongTy; 10704 } else { 10705 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10706 assert(NumPositiveBits <= BestWidth && 10707 "How could an initializer get larger than ULL?"); 10708 BestType = Context.UnsignedLongLongTy; 10709 BestPromotionType 10710 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10711 ? Context.UnsignedLongLongTy : Context.LongLongTy; 10712 } 10713 } 10714 10715 // Loop over all of the enumerator constants, changing their types to match 10716 // the type of the enum if needed. 10717 for (unsigned i = 0; i != NumElements; ++i) { 10718 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10719 if (!ECD) continue; // Already issued a diagnostic. 10720 10721 // Standard C says the enumerators have int type, but we allow, as an 10722 // extension, the enumerators to be larger than int size. If each 10723 // enumerator value fits in an int, type it as an int, otherwise type it the 10724 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 10725 // that X has type 'int', not 'unsigned'. 10726 10727 // Determine whether the value fits into an int. 10728 llvm::APSInt InitVal = ECD->getInitVal(); 10729 10730 // If it fits into an integer type, force it. Otherwise force it to match 10731 // the enum decl type. 10732 QualType NewTy; 10733 unsigned NewWidth; 10734 bool NewSign; 10735 if (!getLangOpts().CPlusPlus && 10736 !Enum->isFixed() && 10737 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 10738 NewTy = Context.IntTy; 10739 NewWidth = IntWidth; 10740 NewSign = true; 10741 } else if (ECD->getType() == BestType) { 10742 // Already the right type! 10743 if (getLangOpts().CPlusPlus) 10744 // C++ [dcl.enum]p4: Following the closing brace of an 10745 // enum-specifier, each enumerator has the type of its 10746 // enumeration. 10747 ECD->setType(EnumType); 10748 continue; 10749 } else { 10750 NewTy = BestType; 10751 NewWidth = BestWidth; 10752 NewSign = BestType->isSignedIntegerOrEnumerationType(); 10753 } 10754 10755 // Adjust the APSInt value. 10756 InitVal = InitVal.extOrTrunc(NewWidth); 10757 InitVal.setIsSigned(NewSign); 10758 ECD->setInitVal(InitVal); 10759 10760 // Adjust the Expr initializer and type. 10761 if (ECD->getInitExpr() && 10762 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10763 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10764 CK_IntegralCast, 10765 ECD->getInitExpr(), 10766 /*base paths*/ 0, 10767 VK_RValue)); 10768 if (getLangOpts().CPlusPlus) 10769 // C++ [dcl.enum]p4: Following the closing brace of an 10770 // enum-specifier, each enumerator has the type of its 10771 // enumeration. 10772 ECD->setType(EnumType); 10773 else 10774 ECD->setType(NewTy); 10775 } 10776 10777 Enum->completeDefinition(BestType, BestPromotionType, 10778 NumPositiveBits, NumNegativeBits); 10779 10780 // If we're declaring a function, ensure this decl isn't forgotten about - 10781 // it needs to go into the function scope. 10782 if (InFunctionDeclarator) 10783 DeclsInPrototypeScope.push_back(Enum); 10784 10785 CheckForUniqueEnumValues(*this, Elements, NumElements, Enum, EnumType); 10786} 10787 10788Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10789 SourceLocation StartLoc, 10790 SourceLocation EndLoc) { 10791 StringLiteral *AsmString = cast<StringLiteral>(expr); 10792 10793 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10794 AsmString, StartLoc, 10795 EndLoc); 10796 CurContext->addDecl(New); 10797 return New; 10798} 10799 10800DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10801 SourceLocation ImportLoc, 10802 ModuleIdPath Path) { 10803 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10804 Module::AllVisible, 10805 /*IsIncludeDirective=*/false); 10806 if (!Mod) 10807 return true; 10808 10809 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10810 Module *ModCheck = Mod; 10811 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10812 // If we've run out of module parents, just drop the remaining identifiers. 10813 // We need the length to be consistent. 10814 if (!ModCheck) 10815 break; 10816 ModCheck = ModCheck->Parent; 10817 10818 IdentifierLocs.push_back(Path[I].second); 10819 } 10820 10821 ImportDecl *Import = ImportDecl::Create(Context, 10822 Context.getTranslationUnitDecl(), 10823 AtLoc.isValid()? AtLoc : ImportLoc, 10824 Mod, IdentifierLocs); 10825 Context.getTranslationUnitDecl()->addDecl(Import); 10826 return Import; 10827} 10828 10829void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name, 10830 IdentifierInfo* AliasName, 10831 SourceLocation PragmaLoc, 10832 SourceLocation NameLoc, 10833 SourceLocation AliasNameLoc) { 10834 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, 10835 LookupOrdinaryName); 10836 AsmLabelAttr *Attr = 10837 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName()); 10838 10839 if (PrevDecl) 10840 PrevDecl->addAttr(Attr); 10841 else 10842 (void)ExtnameUndeclaredIdentifiers.insert( 10843 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr)); 10844} 10845 10846void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10847 SourceLocation PragmaLoc, 10848 SourceLocation NameLoc) { 10849 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10850 10851 if (PrevDecl) { 10852 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10853 } else { 10854 (void)WeakUndeclaredIdentifiers.insert( 10855 std::pair<IdentifierInfo*,WeakInfo> 10856 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10857 } 10858} 10859 10860void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10861 IdentifierInfo* AliasName, 10862 SourceLocation PragmaLoc, 10863 SourceLocation NameLoc, 10864 SourceLocation AliasNameLoc) { 10865 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10866 LookupOrdinaryName); 10867 WeakInfo W = WeakInfo(Name, NameLoc); 10868 10869 if (PrevDecl) { 10870 if (!PrevDecl->hasAttr<AliasAttr>()) 10871 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10872 DeclApplyPragmaWeak(TUScope, ND, W); 10873 } else { 10874 (void)WeakUndeclaredIdentifiers.insert( 10875 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10876 } 10877} 10878 10879Decl *Sema::getObjCDeclContext() const { 10880 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10881} 10882 10883AvailabilityResult Sema::getCurContextAvailability() const { 10884 const Decl *D = cast<Decl>(getCurLexicalContext()); 10885 // A category implicitly has the availability of the interface. 10886 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10887 D = CatD->getClassInterface(); 10888 10889 return D->getAvailability(); 10890} 10891