SemaDecl.cpp revision 767a1a2391e60e358ed7d793e091cc1731a5e186
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 565Sema::NameClassification Sema::ClassifyName(Scope *S, 566 CXXScopeSpec &SS, 567 IdentifierInfo *&Name, 568 SourceLocation NameLoc, 569 const Token &NextToken) { 570 DeclarationNameInfo NameInfo(Name, NameLoc); 571 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 572 573 if (NextToken.is(tok::coloncolon)) { 574 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 575 QualType(), false, SS, 0, false); 576 577 } 578 579 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 580 LookupParsedName(Result, S, &SS, !CurMethod); 581 582 // Perform lookup for Objective-C instance variables (including automatically 583 // synthesized instance variables), if we're in an Objective-C method. 584 // FIXME: This lookup really, really needs to be folded in to the normal 585 // unqualified lookup mechanism. 586 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 587 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 588 if (E.get() || E.isInvalid()) 589 return E; 590 } 591 592 bool SecondTry = false; 593 bool IsFilteredTemplateName = false; 594 595Corrected: 596 switch (Result.getResultKind()) { 597 case LookupResult::NotFound: 598 // If an unqualified-id is followed by a '(', then we have a function 599 // call. 600 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 601 // In C++, this is an ADL-only call. 602 // FIXME: Reference? 603 if (getLangOpts().CPlusPlus) 604 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 605 606 // C90 6.3.2.2: 607 // If the expression that precedes the parenthesized argument list in a 608 // function call consists solely of an identifier, and if no 609 // declaration is visible for this identifier, the identifier is 610 // implicitly declared exactly as if, in the innermost block containing 611 // the function call, the declaration 612 // 613 // extern int identifier (); 614 // 615 // appeared. 616 // 617 // We also allow this in C99 as an extension. 618 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 619 Result.addDecl(D); 620 Result.resolveKind(); 621 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 622 } 623 } 624 625 // In C, we first see whether there is a tag type by the same name, in 626 // which case it's likely that the user just forget to write "enum", 627 // "struct", or "union". 628 if (!getLangOpts().CPlusPlus && !SecondTry && 629 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) { 630 break; 631 } 632 633 // Perform typo correction to determine if there is another name that is 634 // close to this name. 635 if (!SecondTry) { 636 SecondTry = true; 637 CorrectionCandidateCallback DefaultValidator; 638 // Try to limit which sets of keywords should be included in typo 639 // correction based on what the next token is. 640 DefaultValidator.WantTypeSpecifiers = 641 NextToken.is(tok::l_paren) || NextToken.is(tok::less) || 642 NextToken.is(tok::identifier) || NextToken.is(tok::star) || 643 NextToken.is(tok::amp) || NextToken.is(tok::l_square); 644 DefaultValidator.WantExpressionKeywords = 645 NextToken.is(tok::l_paren) || NextToken.is(tok::identifier) || 646 NextToken.is(tok::arrow) || NextToken.is(tok::period); 647 DefaultValidator.WantRemainingKeywords = 648 NextToken.is(tok::l_paren) || NextToken.is(tok::semi) || 649 NextToken.is(tok::identifier) || NextToken.is(tok::l_brace); 650 DefaultValidator.WantCXXNamedCasts = false; 651 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 652 Result.getLookupKind(), S, 653 &SS, DefaultValidator)) { 654 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 655 unsigned QualifiedDiag = diag::err_no_member_suggest; 656 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 657 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 658 659 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 660 NamedDecl *UnderlyingFirstDecl 661 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 662 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 663 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 664 UnqualifiedDiag = diag::err_no_template_suggest; 665 QualifiedDiag = diag::err_no_member_template_suggest; 666 } else if (UnderlyingFirstDecl && 667 (isa<TypeDecl>(UnderlyingFirstDecl) || 668 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 669 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 670 UnqualifiedDiag = diag::err_unknown_typename_suggest; 671 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 672 } 673 674 if (SS.isEmpty()) 675 Diag(NameLoc, UnqualifiedDiag) 676 << Name << CorrectedQuotedStr 677 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 678 else 679 Diag(NameLoc, QualifiedDiag) 680 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 681 << SS.getRange() 682 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 683 684 // Update the name, so that the caller has the new name. 685 Name = Corrected.getCorrectionAsIdentifierInfo(); 686 687 // Typo correction corrected to a keyword. 688 if (Corrected.isKeyword()) 689 return Corrected.getCorrectionAsIdentifierInfo(); 690 691 // Also update the LookupResult... 692 // FIXME: This should probably go away at some point 693 Result.clear(); 694 Result.setLookupName(Corrected.getCorrection()); 695 if (FirstDecl) { 696 Result.addDecl(FirstDecl); 697 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 698 << CorrectedQuotedStr; 699 } 700 701 // If we found an Objective-C instance variable, let 702 // LookupInObjCMethod build the appropriate expression to 703 // reference the ivar. 704 // FIXME: This is a gross hack. 705 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 706 Result.clear(); 707 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 708 return move(E); 709 } 710 711 goto Corrected; 712 } 713 } 714 715 // We failed to correct; just fall through and let the parser deal with it. 716 Result.suppressDiagnostics(); 717 return NameClassification::Unknown(); 718 719 case LookupResult::NotFoundInCurrentInstantiation: { 720 // We performed name lookup into the current instantiation, and there were 721 // dependent bases, so we treat this result the same way as any other 722 // dependent nested-name-specifier. 723 724 // C++ [temp.res]p2: 725 // A name used in a template declaration or definition and that is 726 // dependent on a template-parameter is assumed not to name a type 727 // unless the applicable name lookup finds a type name or the name is 728 // qualified by the keyword typename. 729 // 730 // FIXME: If the next token is '<', we might want to ask the parser to 731 // perform some heroics to see if we actually have a 732 // template-argument-list, which would indicate a missing 'template' 733 // keyword here. 734 return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(), 735 NameInfo, /*TemplateArgs=*/0); 736 } 737 738 case LookupResult::Found: 739 case LookupResult::FoundOverloaded: 740 case LookupResult::FoundUnresolvedValue: 741 break; 742 743 case LookupResult::Ambiguous: 744 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 745 hasAnyAcceptableTemplateNames(Result)) { 746 // C++ [temp.local]p3: 747 // A lookup that finds an injected-class-name (10.2) can result in an 748 // ambiguity in certain cases (for example, if it is found in more than 749 // one base class). If all of the injected-class-names that are found 750 // refer to specializations of the same class template, and if the name 751 // is followed by a template-argument-list, the reference refers to the 752 // class template itself and not a specialization thereof, and is not 753 // ambiguous. 754 // 755 // This filtering can make an ambiguous result into an unambiguous one, 756 // so try again after filtering out template names. 757 FilterAcceptableTemplateNames(Result); 758 if (!Result.isAmbiguous()) { 759 IsFilteredTemplateName = true; 760 break; 761 } 762 } 763 764 // Diagnose the ambiguity and return an error. 765 return NameClassification::Error(); 766 } 767 768 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 769 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 770 // C++ [temp.names]p3: 771 // After name lookup (3.4) finds that a name is a template-name or that 772 // an operator-function-id or a literal- operator-id refers to a set of 773 // overloaded functions any member of which is a function template if 774 // this is followed by a <, the < is always taken as the delimiter of a 775 // template-argument-list and never as the less-than operator. 776 if (!IsFilteredTemplateName) 777 FilterAcceptableTemplateNames(Result); 778 779 if (!Result.empty()) { 780 bool IsFunctionTemplate; 781 TemplateName Template; 782 if (Result.end() - Result.begin() > 1) { 783 IsFunctionTemplate = true; 784 Template = Context.getOverloadedTemplateName(Result.begin(), 785 Result.end()); 786 } else { 787 TemplateDecl *TD 788 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 789 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 790 791 if (SS.isSet() && !SS.isInvalid()) 792 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 793 /*TemplateKeyword=*/false, 794 TD); 795 else 796 Template = TemplateName(TD); 797 } 798 799 if (IsFunctionTemplate) { 800 // Function templates always go through overload resolution, at which 801 // point we'll perform the various checks (e.g., accessibility) we need 802 // to based on which function we selected. 803 Result.suppressDiagnostics(); 804 805 return NameClassification::FunctionTemplate(Template); 806 } 807 808 return NameClassification::TypeTemplate(Template); 809 } 810 } 811 812 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 813 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 814 DiagnoseUseOfDecl(Type, NameLoc); 815 QualType T = Context.getTypeDeclType(Type); 816 return ParsedType::make(T); 817 } 818 819 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 820 if (!Class) { 821 // FIXME: It's unfortunate that we don't have a Type node for handling this. 822 if (ObjCCompatibleAliasDecl *Alias 823 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 824 Class = Alias->getClassInterface(); 825 } 826 827 if (Class) { 828 DiagnoseUseOfDecl(Class, NameLoc); 829 830 if (NextToken.is(tok::period)) { 831 // Interface. <something> is parsed as a property reference expression. 832 // Just return "unknown" as a fall-through for now. 833 Result.suppressDiagnostics(); 834 return NameClassification::Unknown(); 835 } 836 837 QualType T = Context.getObjCInterfaceType(Class); 838 return ParsedType::make(T); 839 } 840 841 // Check for a tag type hidden by a non-type decl in a few cases where it 842 // seems likely a type is wanted instead of the non-type that was found. 843 if (!getLangOpts().ObjC1 && FirstDecl && !isa<ClassTemplateDecl>(FirstDecl) && 844 !isa<TypeAliasTemplateDecl>(FirstDecl)) { 845 bool NextIsOp = NextToken.is(tok::amp) || NextToken.is(tok::star); 846 if ((NextToken.is(tok::identifier) || 847 (NextIsOp && FirstDecl->isFunctionOrFunctionTemplate())) && 848 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) { 849 FirstDecl = (*Result.begin())->getUnderlyingDecl(); 850 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 851 DiagnoseUseOfDecl(Type, NameLoc); 852 QualType T = Context.getTypeDeclType(Type); 853 return ParsedType::make(T); 854 } 855 } 856 } 857 858 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 859 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0); 860 861 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 862 return BuildDeclarationNameExpr(SS, Result, ADL); 863} 864 865// Determines the context to return to after temporarily entering a 866// context. This depends in an unnecessarily complicated way on the 867// exact ordering of callbacks from the parser. 868DeclContext *Sema::getContainingDC(DeclContext *DC) { 869 870 // Functions defined inline within classes aren't parsed until we've 871 // finished parsing the top-level class, so the top-level class is 872 // the context we'll need to return to. 873 if (isa<FunctionDecl>(DC)) { 874 DC = DC->getLexicalParent(); 875 876 // A function not defined within a class will always return to its 877 // lexical context. 878 if (!isa<CXXRecordDecl>(DC)) 879 return DC; 880 881 // A C++ inline method/friend is parsed *after* the topmost class 882 // it was declared in is fully parsed ("complete"); the topmost 883 // class is the context we need to return to. 884 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 885 DC = RD; 886 887 // Return the declaration context of the topmost class the inline method is 888 // declared in. 889 return DC; 890 } 891 892 return DC->getLexicalParent(); 893} 894 895void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 896 assert(getContainingDC(DC) == CurContext && 897 "The next DeclContext should be lexically contained in the current one."); 898 CurContext = DC; 899 S->setEntity(DC); 900} 901 902void Sema::PopDeclContext() { 903 assert(CurContext && "DeclContext imbalance!"); 904 905 CurContext = getContainingDC(CurContext); 906 assert(CurContext && "Popped translation unit!"); 907} 908 909/// EnterDeclaratorContext - Used when we must lookup names in the context 910/// of a declarator's nested name specifier. 911/// 912void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 913 // C++0x [basic.lookup.unqual]p13: 914 // A name used in the definition of a static data member of class 915 // X (after the qualified-id of the static member) is looked up as 916 // if the name was used in a member function of X. 917 // C++0x [basic.lookup.unqual]p14: 918 // If a variable member of a namespace is defined outside of the 919 // scope of its namespace then any name used in the definition of 920 // the variable member (after the declarator-id) is looked up as 921 // if the definition of the variable member occurred in its 922 // namespace. 923 // Both of these imply that we should push a scope whose context 924 // is the semantic context of the declaration. We can't use 925 // PushDeclContext here because that context is not necessarily 926 // lexically contained in the current context. Fortunately, 927 // the containing scope should have the appropriate information. 928 929 assert(!S->getEntity() && "scope already has entity"); 930 931#ifndef NDEBUG 932 Scope *Ancestor = S->getParent(); 933 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 934 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 935#endif 936 937 CurContext = DC; 938 S->setEntity(DC); 939} 940 941void Sema::ExitDeclaratorContext(Scope *S) { 942 assert(S->getEntity() == CurContext && "Context imbalance!"); 943 944 // Switch back to the lexical context. The safety of this is 945 // enforced by an assert in EnterDeclaratorContext. 946 Scope *Ancestor = S->getParent(); 947 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 948 CurContext = (DeclContext*) Ancestor->getEntity(); 949 950 // We don't need to do anything with the scope, which is going to 951 // disappear. 952} 953 954 955void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 956 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 957 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 958 // We assume that the caller has already called 959 // ActOnReenterTemplateScope 960 FD = TFD->getTemplatedDecl(); 961 } 962 if (!FD) 963 return; 964 965 // Same implementation as PushDeclContext, but enters the context 966 // from the lexical parent, rather than the top-level class. 967 assert(CurContext == FD->getLexicalParent() && 968 "The next DeclContext should be lexically contained in the current one."); 969 CurContext = FD; 970 S->setEntity(CurContext); 971 972 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 973 ParmVarDecl *Param = FD->getParamDecl(P); 974 // If the parameter has an identifier, then add it to the scope 975 if (Param->getIdentifier()) { 976 S->AddDecl(Param); 977 IdResolver.AddDecl(Param); 978 } 979 } 980} 981 982 983void Sema::ActOnExitFunctionContext() { 984 // Same implementation as PopDeclContext, but returns to the lexical parent, 985 // rather than the top-level class. 986 assert(CurContext && "DeclContext imbalance!"); 987 CurContext = CurContext->getLexicalParent(); 988 assert(CurContext && "Popped translation unit!"); 989} 990 991 992/// \brief Determine whether we allow overloading of the function 993/// PrevDecl with another declaration. 994/// 995/// This routine determines whether overloading is possible, not 996/// whether some new function is actually an overload. It will return 997/// true in C++ (where we can always provide overloads) or, as an 998/// extension, in C when the previous function is already an 999/// overloaded function declaration or has the "overloadable" 1000/// attribute. 1001static bool AllowOverloadingOfFunction(LookupResult &Previous, 1002 ASTContext &Context) { 1003 if (Context.getLangOpts().CPlusPlus) 1004 return true; 1005 1006 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 1007 return true; 1008 1009 return (Previous.getResultKind() == LookupResult::Found 1010 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 1011} 1012 1013/// Add this decl to the scope shadowed decl chains. 1014void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 1015 // Move up the scope chain until we find the nearest enclosing 1016 // non-transparent context. The declaration will be introduced into this 1017 // scope. 1018 while (S->getEntity() && 1019 ((DeclContext *)S->getEntity())->isTransparentContext()) 1020 S = S->getParent(); 1021 1022 // Add scoped declarations into their context, so that they can be 1023 // found later. Declarations without a context won't be inserted 1024 // into any context. 1025 if (AddToContext) 1026 CurContext->addDecl(D); 1027 1028 // Out-of-line definitions shouldn't be pushed into scope in C++. 1029 // Out-of-line variable and function definitions shouldn't even in C. 1030 if ((getLangOpts().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 1031 D->isOutOfLine() && 1032 !D->getDeclContext()->getRedeclContext()->Equals( 1033 D->getLexicalDeclContext()->getRedeclContext())) 1034 return; 1035 1036 // Template instantiations should also not be pushed into scope. 1037 if (isa<FunctionDecl>(D) && 1038 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 1039 return; 1040 1041 // If this replaces anything in the current scope, 1042 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 1043 IEnd = IdResolver.end(); 1044 for (; I != IEnd; ++I) { 1045 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 1046 S->RemoveDecl(*I); 1047 IdResolver.RemoveDecl(*I); 1048 1049 // Should only need to replace one decl. 1050 break; 1051 } 1052 } 1053 1054 S->AddDecl(D); 1055 1056 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 1057 // Implicitly-generated labels may end up getting generated in an order that 1058 // isn't strictly lexical, which breaks name lookup. Be careful to insert 1059 // the label at the appropriate place in the identifier chain. 1060 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 1061 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 1062 if (IDC == CurContext) { 1063 if (!S->isDeclScope(*I)) 1064 continue; 1065 } else if (IDC->Encloses(CurContext)) 1066 break; 1067 } 1068 1069 IdResolver.InsertDeclAfter(I, D); 1070 } else { 1071 IdResolver.AddDecl(D); 1072 } 1073} 1074 1075void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 1076 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 1077 TUScope->AddDecl(D); 1078} 1079 1080bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 1081 bool ExplicitInstantiationOrSpecialization) { 1082 return IdResolver.isDeclInScope(D, Ctx, Context, S, 1083 ExplicitInstantiationOrSpecialization); 1084} 1085 1086Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 1087 DeclContext *TargetDC = DC->getPrimaryContext(); 1088 do { 1089 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 1090 if (ScopeDC->getPrimaryContext() == TargetDC) 1091 return S; 1092 } while ((S = S->getParent())); 1093 1094 return 0; 1095} 1096 1097static bool isOutOfScopePreviousDeclaration(NamedDecl *, 1098 DeclContext*, 1099 ASTContext&); 1100 1101/// Filters out lookup results that don't fall within the given scope 1102/// as determined by isDeclInScope. 1103void Sema::FilterLookupForScope(LookupResult &R, 1104 DeclContext *Ctx, Scope *S, 1105 bool ConsiderLinkage, 1106 bool ExplicitInstantiationOrSpecialization) { 1107 LookupResult::Filter F = R.makeFilter(); 1108 while (F.hasNext()) { 1109 NamedDecl *D = F.next(); 1110 1111 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 1112 continue; 1113 1114 if (ConsiderLinkage && 1115 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 1116 continue; 1117 1118 F.erase(); 1119 } 1120 1121 F.done(); 1122} 1123 1124static bool isUsingDecl(NamedDecl *D) { 1125 return isa<UsingShadowDecl>(D) || 1126 isa<UnresolvedUsingTypenameDecl>(D) || 1127 isa<UnresolvedUsingValueDecl>(D); 1128} 1129 1130/// Removes using shadow declarations from the lookup results. 1131static void RemoveUsingDecls(LookupResult &R) { 1132 LookupResult::Filter F = R.makeFilter(); 1133 while (F.hasNext()) 1134 if (isUsingDecl(F.next())) 1135 F.erase(); 1136 1137 F.done(); 1138} 1139 1140/// \brief Check for this common pattern: 1141/// @code 1142/// class S { 1143/// S(const S&); // DO NOT IMPLEMENT 1144/// void operator=(const S&); // DO NOT IMPLEMENT 1145/// }; 1146/// @endcode 1147static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1148 // FIXME: Should check for private access too but access is set after we get 1149 // the decl here. 1150 if (D->doesThisDeclarationHaveABody()) 1151 return false; 1152 1153 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1154 return CD->isCopyConstructor(); 1155 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1156 return Method->isCopyAssignmentOperator(); 1157 return false; 1158} 1159 1160bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1161 assert(D); 1162 1163 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1164 return false; 1165 1166 // Ignore class templates. 1167 if (D->getDeclContext()->isDependentContext() || 1168 D->getLexicalDeclContext()->isDependentContext()) 1169 return false; 1170 1171 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1172 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1173 return false; 1174 1175 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1176 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1177 return false; 1178 } else { 1179 // 'static inline' functions are used in headers; don't warn. 1180 if (FD->getStorageClass() == SC_Static && 1181 FD->isInlineSpecified()) 1182 return false; 1183 } 1184 1185 if (FD->doesThisDeclarationHaveABody() && 1186 Context.DeclMustBeEmitted(FD)) 1187 return false; 1188 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1189 if (!VD->isFileVarDecl() || 1190 VD->getType().isConstant(Context) || 1191 Context.DeclMustBeEmitted(VD)) 1192 return false; 1193 1194 if (VD->isStaticDataMember() && 1195 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1196 return false; 1197 1198 } else { 1199 return false; 1200 } 1201 1202 // Only warn for unused decls internal to the translation unit. 1203 if (D->getLinkage() == ExternalLinkage) 1204 return false; 1205 1206 return true; 1207} 1208 1209void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1210 if (!D) 1211 return; 1212 1213 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1214 const FunctionDecl *First = FD->getFirstDeclaration(); 1215 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1216 return; // First should already be in the vector. 1217 } 1218 1219 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1220 const VarDecl *First = VD->getFirstDeclaration(); 1221 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1222 return; // First should already be in the vector. 1223 } 1224 1225 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1226 UnusedFileScopedDecls.push_back(D); 1227} 1228 1229static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1230 if (D->isInvalidDecl()) 1231 return false; 1232 1233 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1234 return false; 1235 1236 if (isa<LabelDecl>(D)) 1237 return true; 1238 1239 // White-list anything that isn't a local variable. 1240 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1241 !D->getDeclContext()->isFunctionOrMethod()) 1242 return false; 1243 1244 // Types of valid local variables should be complete, so this should succeed. 1245 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1246 1247 // White-list anything with an __attribute__((unused)) type. 1248 QualType Ty = VD->getType(); 1249 1250 // Only look at the outermost level of typedef. 1251 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1252 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1253 return false; 1254 } 1255 1256 // If we failed to complete the type for some reason, or if the type is 1257 // dependent, don't diagnose the variable. 1258 if (Ty->isIncompleteType() || Ty->isDependentType()) 1259 return false; 1260 1261 if (const TagType *TT = Ty->getAs<TagType>()) { 1262 const TagDecl *Tag = TT->getDecl(); 1263 if (Tag->hasAttr<UnusedAttr>()) 1264 return false; 1265 1266 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1267 if (!RD->hasTrivialDestructor()) 1268 return false; 1269 1270 if (const Expr *Init = VD->getInit()) { 1271 const CXXConstructExpr *Construct = 1272 dyn_cast<CXXConstructExpr>(Init); 1273 if (Construct && !Construct->isElidable()) { 1274 CXXConstructorDecl *CD = Construct->getConstructor(); 1275 if (!CD->isTrivial()) 1276 return false; 1277 } 1278 } 1279 } 1280 } 1281 1282 // TODO: __attribute__((unused)) templates? 1283 } 1284 1285 return true; 1286} 1287 1288static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1289 FixItHint &Hint) { 1290 if (isa<LabelDecl>(D)) { 1291 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1292 tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), true); 1293 if (AfterColon.isInvalid()) 1294 return; 1295 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1296 getCharRange(D->getLocStart(), AfterColon)); 1297 } 1298 return; 1299} 1300 1301/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1302/// unless they are marked attr(unused). 1303void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1304 FixItHint Hint; 1305 if (!ShouldDiagnoseUnusedDecl(D)) 1306 return; 1307 1308 GenerateFixForUnusedDecl(D, Context, Hint); 1309 1310 unsigned DiagID; 1311 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1312 DiagID = diag::warn_unused_exception_param; 1313 else if (isa<LabelDecl>(D)) 1314 DiagID = diag::warn_unused_label; 1315 else 1316 DiagID = diag::warn_unused_variable; 1317 1318 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1319} 1320 1321static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1322 // Verify that we have no forward references left. If so, there was a goto 1323 // or address of a label taken, but no definition of it. Label fwd 1324 // definitions are indicated with a null substmt. 1325 if (L->getStmt() == 0) 1326 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1327} 1328 1329void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1330 if (S->decl_empty()) return; 1331 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1332 "Scope shouldn't contain decls!"); 1333 1334 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1335 I != E; ++I) { 1336 Decl *TmpD = (*I); 1337 assert(TmpD && "This decl didn't get pushed??"); 1338 1339 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1340 NamedDecl *D = cast<NamedDecl>(TmpD); 1341 1342 if (!D->getDeclName()) continue; 1343 1344 // Diagnose unused variables in this scope. 1345 if (!S->hasErrorOccurred()) 1346 DiagnoseUnusedDecl(D); 1347 1348 // If this was a forward reference to a label, verify it was defined. 1349 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1350 CheckPoppedLabel(LD, *this); 1351 1352 // Remove this name from our lexical scope. 1353 IdResolver.RemoveDecl(D); 1354 } 1355} 1356 1357void Sema::ActOnStartFunctionDeclarator() { 1358 ++InFunctionDeclarator; 1359} 1360 1361void Sema::ActOnEndFunctionDeclarator() { 1362 assert(InFunctionDeclarator); 1363 --InFunctionDeclarator; 1364} 1365 1366/// \brief Look for an Objective-C class in the translation unit. 1367/// 1368/// \param Id The name of the Objective-C class we're looking for. If 1369/// typo-correction fixes this name, the Id will be updated 1370/// to the fixed name. 1371/// 1372/// \param IdLoc The location of the name in the translation unit. 1373/// 1374/// \param DoTypoCorrection If true, this routine will attempt typo correction 1375/// if there is no class with the given name. 1376/// 1377/// \returns The declaration of the named Objective-C class, or NULL if the 1378/// class could not be found. 1379ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1380 SourceLocation IdLoc, 1381 bool DoTypoCorrection) { 1382 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1383 // creation from this context. 1384 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1385 1386 if (!IDecl && DoTypoCorrection) { 1387 // Perform typo correction at the given location, but only if we 1388 // find an Objective-C class name. 1389 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1390 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1391 LookupOrdinaryName, TUScope, NULL, 1392 Validator)) { 1393 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1394 Diag(IdLoc, diag::err_undef_interface_suggest) 1395 << Id << IDecl->getDeclName() 1396 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1397 Diag(IDecl->getLocation(), diag::note_previous_decl) 1398 << IDecl->getDeclName(); 1399 1400 Id = IDecl->getIdentifier(); 1401 } 1402 } 1403 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1404 // This routine must always return a class definition, if any. 1405 if (Def && Def->getDefinition()) 1406 Def = Def->getDefinition(); 1407 return Def; 1408} 1409 1410/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1411/// from S, where a non-field would be declared. This routine copes 1412/// with the difference between C and C++ scoping rules in structs and 1413/// unions. For example, the following code is well-formed in C but 1414/// ill-formed in C++: 1415/// @code 1416/// struct S6 { 1417/// enum { BAR } e; 1418/// }; 1419/// 1420/// void test_S6() { 1421/// struct S6 a; 1422/// a.e = BAR; 1423/// } 1424/// @endcode 1425/// For the declaration of BAR, this routine will return a different 1426/// scope. The scope S will be the scope of the unnamed enumeration 1427/// within S6. In C++, this routine will return the scope associated 1428/// with S6, because the enumeration's scope is a transparent 1429/// context but structures can contain non-field names. In C, this 1430/// routine will return the translation unit scope, since the 1431/// enumeration's scope is a transparent context and structures cannot 1432/// contain non-field names. 1433Scope *Sema::getNonFieldDeclScope(Scope *S) { 1434 while (((S->getFlags() & Scope::DeclScope) == 0) || 1435 (S->getEntity() && 1436 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1437 (S->isClassScope() && !getLangOpts().CPlusPlus)) 1438 S = S->getParent(); 1439 return S; 1440} 1441 1442/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1443/// file scope. lazily create a decl for it. ForRedeclaration is true 1444/// if we're creating this built-in in anticipation of redeclaring the 1445/// built-in. 1446NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1447 Scope *S, bool ForRedeclaration, 1448 SourceLocation Loc) { 1449 Builtin::ID BID = (Builtin::ID)bid; 1450 1451 ASTContext::GetBuiltinTypeError Error; 1452 QualType R = Context.GetBuiltinType(BID, Error); 1453 switch (Error) { 1454 case ASTContext::GE_None: 1455 // Okay 1456 break; 1457 1458 case ASTContext::GE_Missing_stdio: 1459 if (ForRedeclaration) 1460 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1461 << Context.BuiltinInfo.GetName(BID); 1462 return 0; 1463 1464 case ASTContext::GE_Missing_setjmp: 1465 if (ForRedeclaration) 1466 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1467 << Context.BuiltinInfo.GetName(BID); 1468 return 0; 1469 1470 case ASTContext::GE_Missing_ucontext: 1471 if (ForRedeclaration) 1472 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1473 << Context.BuiltinInfo.GetName(BID); 1474 return 0; 1475 } 1476 1477 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1478 Diag(Loc, diag::ext_implicit_lib_function_decl) 1479 << Context.BuiltinInfo.GetName(BID) 1480 << R; 1481 if (Context.BuiltinInfo.getHeaderName(BID) && 1482 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1483 != DiagnosticsEngine::Ignored) 1484 Diag(Loc, diag::note_please_include_header) 1485 << Context.BuiltinInfo.getHeaderName(BID) 1486 << Context.BuiltinInfo.GetName(BID); 1487 } 1488 1489 FunctionDecl *New = FunctionDecl::Create(Context, 1490 Context.getTranslationUnitDecl(), 1491 Loc, Loc, II, R, /*TInfo=*/0, 1492 SC_Extern, 1493 SC_None, false, 1494 /*hasPrototype=*/true); 1495 New->setImplicit(); 1496 1497 // Create Decl objects for each parameter, adding them to the 1498 // FunctionDecl. 1499 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1500 SmallVector<ParmVarDecl*, 16> Params; 1501 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1502 ParmVarDecl *parm = 1503 ParmVarDecl::Create(Context, New, SourceLocation(), 1504 SourceLocation(), 0, 1505 FT->getArgType(i), /*TInfo=*/0, 1506 SC_None, SC_None, 0); 1507 parm->setScopeInfo(0, i); 1508 Params.push_back(parm); 1509 } 1510 New->setParams(Params); 1511 } 1512 1513 AddKnownFunctionAttributes(New); 1514 1515 // TUScope is the translation-unit scope to insert this function into. 1516 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1517 // relate Scopes to DeclContexts, and probably eliminate CurContext 1518 // entirely, but we're not there yet. 1519 DeclContext *SavedContext = CurContext; 1520 CurContext = Context.getTranslationUnitDecl(); 1521 PushOnScopeChains(New, TUScope); 1522 CurContext = SavedContext; 1523 return New; 1524} 1525 1526bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1527 QualType OldType; 1528 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1529 OldType = OldTypedef->getUnderlyingType(); 1530 else 1531 OldType = Context.getTypeDeclType(Old); 1532 QualType NewType = New->getUnderlyingType(); 1533 1534 if (NewType->isVariablyModifiedType()) { 1535 // Must not redefine a typedef with a variably-modified type. 1536 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1537 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1538 << Kind << NewType; 1539 if (Old->getLocation().isValid()) 1540 Diag(Old->getLocation(), diag::note_previous_definition); 1541 New->setInvalidDecl(); 1542 return true; 1543 } 1544 1545 if (OldType != NewType && 1546 !OldType->isDependentType() && 1547 !NewType->isDependentType() && 1548 !Context.hasSameType(OldType, NewType)) { 1549 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1550 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1551 << Kind << NewType << OldType; 1552 if (Old->getLocation().isValid()) 1553 Diag(Old->getLocation(), diag::note_previous_definition); 1554 New->setInvalidDecl(); 1555 return true; 1556 } 1557 return false; 1558} 1559 1560/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1561/// same name and scope as a previous declaration 'Old'. Figure out 1562/// how to resolve this situation, merging decls or emitting 1563/// diagnostics as appropriate. If there was an error, set New to be invalid. 1564/// 1565void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1566 // If the new decl is known invalid already, don't bother doing any 1567 // merging checks. 1568 if (New->isInvalidDecl()) return; 1569 1570 // Allow multiple definitions for ObjC built-in typedefs. 1571 // FIXME: Verify the underlying types are equivalent! 1572 if (getLangOpts().ObjC1) { 1573 const IdentifierInfo *TypeID = New->getIdentifier(); 1574 switch (TypeID->getLength()) { 1575 default: break; 1576 case 2: 1577 { 1578 if (!TypeID->isStr("id")) 1579 break; 1580 QualType T = New->getUnderlyingType(); 1581 if (!T->isPointerType()) 1582 break; 1583 if (!T->isVoidPointerType()) { 1584 QualType PT = T->getAs<PointerType>()->getPointeeType(); 1585 if (!PT->isStructureType()) 1586 break; 1587 } 1588 Context.setObjCIdRedefinitionType(T); 1589 // Install the built-in type for 'id', ignoring the current definition. 1590 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1591 return; 1592 } 1593 case 5: 1594 if (!TypeID->isStr("Class")) 1595 break; 1596 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1597 // Install the built-in type for 'Class', ignoring the current definition. 1598 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1599 return; 1600 case 3: 1601 if (!TypeID->isStr("SEL")) 1602 break; 1603 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1604 // Install the built-in type for 'SEL', ignoring the current definition. 1605 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1606 return; 1607 } 1608 // Fall through - the typedef name was not a builtin type. 1609 } 1610 1611 // Verify the old decl was also a type. 1612 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1613 if (!Old) { 1614 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1615 << New->getDeclName(); 1616 1617 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1618 if (OldD->getLocation().isValid()) 1619 Diag(OldD->getLocation(), diag::note_previous_definition); 1620 1621 return New->setInvalidDecl(); 1622 } 1623 1624 // If the old declaration is invalid, just give up here. 1625 if (Old->isInvalidDecl()) 1626 return New->setInvalidDecl(); 1627 1628 // If the typedef types are not identical, reject them in all languages and 1629 // with any extensions enabled. 1630 if (isIncompatibleTypedef(Old, New)) 1631 return; 1632 1633 // The types match. Link up the redeclaration chain if the old 1634 // declaration was a typedef. 1635 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1636 New->setPreviousDeclaration(Typedef); 1637 1638 if (getLangOpts().MicrosoftExt) 1639 return; 1640 1641 if (getLangOpts().CPlusPlus) { 1642 // C++ [dcl.typedef]p2: 1643 // In a given non-class scope, a typedef specifier can be used to 1644 // redefine the name of any type declared in that scope to refer 1645 // to the type to which it already refers. 1646 if (!isa<CXXRecordDecl>(CurContext)) 1647 return; 1648 1649 // C++0x [dcl.typedef]p4: 1650 // In a given class scope, a typedef specifier can be used to redefine 1651 // any class-name declared in that scope that is not also a typedef-name 1652 // to refer to the type to which it already refers. 1653 // 1654 // This wording came in via DR424, which was a correction to the 1655 // wording in DR56, which accidentally banned code like: 1656 // 1657 // struct S { 1658 // typedef struct A { } A; 1659 // }; 1660 // 1661 // in the C++03 standard. We implement the C++0x semantics, which 1662 // allow the above but disallow 1663 // 1664 // struct S { 1665 // typedef int I; 1666 // typedef int I; 1667 // }; 1668 // 1669 // since that was the intent of DR56. 1670 if (!isa<TypedefNameDecl>(Old)) 1671 return; 1672 1673 Diag(New->getLocation(), diag::err_redefinition) 1674 << New->getDeclName(); 1675 Diag(Old->getLocation(), diag::note_previous_definition); 1676 return New->setInvalidDecl(); 1677 } 1678 1679 // Modules always permit redefinition of typedefs, as does C11. 1680 if (getLangOpts().Modules || getLangOpts().C11) 1681 return; 1682 1683 // If we have a redefinition of a typedef in C, emit a warning. This warning 1684 // is normally mapped to an error, but can be controlled with 1685 // -Wtypedef-redefinition. If either the original or the redefinition is 1686 // in a system header, don't emit this for compatibility with GCC. 1687 if (getDiagnostics().getSuppressSystemWarnings() && 1688 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1689 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1690 return; 1691 1692 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1693 << New->getDeclName(); 1694 Diag(Old->getLocation(), diag::note_previous_definition); 1695 return; 1696} 1697 1698/// DeclhasAttr - returns true if decl Declaration already has the target 1699/// attribute. 1700static bool 1701DeclHasAttr(const Decl *D, const Attr *A) { 1702 // There can be multiple AvailabilityAttr in a Decl. Make sure we copy 1703 // all of them. It is mergeAvailabilityAttr in SemaDeclAttr.cpp that is 1704 // responsible for making sure they are consistent. 1705 const AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(A); 1706 if (AA) 1707 return false; 1708 1709 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1710 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1711 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1712 if ((*i)->getKind() == A->getKind()) { 1713 if (Ann) { 1714 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1715 return true; 1716 continue; 1717 } 1718 // FIXME: Don't hardcode this check 1719 if (OA && isa<OwnershipAttr>(*i)) 1720 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1721 return true; 1722 } 1723 1724 return false; 1725} 1726 1727bool Sema::mergeDeclAttribute(Decl *D, InheritableAttr *Attr) { 1728 InheritableAttr *NewAttr = NULL; 1729 if (AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(Attr)) 1730 NewAttr = mergeAvailabilityAttr(D, AA->getRange(), AA->getPlatform(), 1731 AA->getIntroduced(), AA->getDeprecated(), 1732 AA->getObsoleted(), AA->getUnavailable(), 1733 AA->getMessage()); 1734 else if (VisibilityAttr *VA = dyn_cast<VisibilityAttr>(Attr)) 1735 NewAttr = mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility()); 1736 else if (DLLImportAttr *ImportA = dyn_cast<DLLImportAttr>(Attr)) 1737 NewAttr = mergeDLLImportAttr(D, ImportA->getRange()); 1738 else if (DLLExportAttr *ExportA = dyn_cast<DLLExportAttr>(Attr)) 1739 NewAttr = mergeDLLExportAttr(D, ExportA->getRange()); 1740 else if (FormatAttr *FA = dyn_cast<FormatAttr>(Attr)) 1741 NewAttr = mergeFormatAttr(D, FA->getRange(), FA->getType(), 1742 FA->getFormatIdx(), FA->getFirstArg()); 1743 else if (SectionAttr *SA = dyn_cast<SectionAttr>(Attr)) 1744 NewAttr = mergeSectionAttr(D, SA->getRange(), SA->getName()); 1745 else if (!DeclHasAttr(D, Attr)) 1746 NewAttr = cast<InheritableAttr>(Attr->clone(Context)); 1747 1748 if (NewAttr) { 1749 NewAttr->setInherited(true); 1750 D->addAttr(NewAttr); 1751 return true; 1752 } 1753 1754 return false; 1755} 1756 1757static const Decl *getDefinition(const Decl *D) { 1758 if (const TagDecl *TD = dyn_cast<TagDecl>(D)) 1759 return TD->getDefinition(); 1760 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 1761 return VD->getDefinition(); 1762 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1763 const FunctionDecl* Def; 1764 if (FD->hasBody(Def)) 1765 return Def; 1766 } 1767 return NULL; 1768} 1769 1770static bool hasAttribute(const Decl *D, attr::Kind Kind) { 1771 for (Decl::attr_iterator I = D->attr_begin(), E = D->attr_end(); 1772 I != E; ++I) { 1773 Attr *Attribute = *I; 1774 if (Attribute->getKind() == Kind) 1775 return true; 1776 } 1777 return false; 1778} 1779 1780/// checkNewAttributesAfterDef - If we already have a definition, check that 1781/// there are no new attributes in this declaration. 1782static void checkNewAttributesAfterDef(Sema &S, Decl *New, const Decl *Old) { 1783 if (!New->hasAttrs()) 1784 return; 1785 1786 const Decl *Def = getDefinition(Old); 1787 if (!Def || Def == New) 1788 return; 1789 1790 AttrVec &NewAttributes = New->getAttrs(); 1791 for (unsigned I = 0, E = NewAttributes.size(); I != E;) { 1792 const Attr *NewAttribute = NewAttributes[I]; 1793 if (hasAttribute(Def, NewAttribute->getKind())) { 1794 ++I; 1795 continue; // regular attr merging will take care of validating this. 1796 } 1797 S.Diag(NewAttribute->getLocation(), 1798 diag::warn_attribute_precede_definition); 1799 S.Diag(Def->getLocation(), diag::note_previous_definition); 1800 NewAttributes.erase(NewAttributes.begin() + I); 1801 --E; 1802 } 1803} 1804 1805/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1806void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1807 bool MergeDeprecation) { 1808 // attributes declared post-definition are currently ignored 1809 checkNewAttributesAfterDef(*this, New, Old); 1810 1811 if (!Old->hasAttrs()) 1812 return; 1813 1814 bool foundAny = New->hasAttrs(); 1815 1816 // Ensure that any moving of objects within the allocated map is done before 1817 // we process them. 1818 if (!foundAny) New->setAttrs(AttrVec()); 1819 1820 for (specific_attr_iterator<InheritableAttr> 1821 i = Old->specific_attr_begin<InheritableAttr>(), 1822 e = Old->specific_attr_end<InheritableAttr>(); 1823 i != e; ++i) { 1824 // Ignore deprecated/unavailable/availability attributes if requested. 1825 if (!MergeDeprecation && 1826 (isa<DeprecatedAttr>(*i) || 1827 isa<UnavailableAttr>(*i) || 1828 isa<AvailabilityAttr>(*i))) 1829 continue; 1830 1831 if (mergeDeclAttribute(New, *i)) 1832 foundAny = true; 1833 } 1834 1835 if (!foundAny) New->dropAttrs(); 1836} 1837 1838/// mergeParamDeclAttributes - Copy attributes from the old parameter 1839/// to the new one. 1840static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1841 const ParmVarDecl *oldDecl, 1842 ASTContext &C) { 1843 if (!oldDecl->hasAttrs()) 1844 return; 1845 1846 bool foundAny = newDecl->hasAttrs(); 1847 1848 // Ensure that any moving of objects within the allocated map is 1849 // done before we process them. 1850 if (!foundAny) newDecl->setAttrs(AttrVec()); 1851 1852 for (specific_attr_iterator<InheritableParamAttr> 1853 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1854 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1855 if (!DeclHasAttr(newDecl, *i)) { 1856 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1857 newAttr->setInherited(true); 1858 newDecl->addAttr(newAttr); 1859 foundAny = true; 1860 } 1861 } 1862 1863 if (!foundAny) newDecl->dropAttrs(); 1864} 1865 1866namespace { 1867 1868/// Used in MergeFunctionDecl to keep track of function parameters in 1869/// C. 1870struct GNUCompatibleParamWarning { 1871 ParmVarDecl *OldParm; 1872 ParmVarDecl *NewParm; 1873 QualType PromotedType; 1874}; 1875 1876} 1877 1878/// getSpecialMember - get the special member enum for a method. 1879Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1880 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1881 if (Ctor->isDefaultConstructor()) 1882 return Sema::CXXDefaultConstructor; 1883 1884 if (Ctor->isCopyConstructor()) 1885 return Sema::CXXCopyConstructor; 1886 1887 if (Ctor->isMoveConstructor()) 1888 return Sema::CXXMoveConstructor; 1889 } else if (isa<CXXDestructorDecl>(MD)) { 1890 return Sema::CXXDestructor; 1891 } else if (MD->isCopyAssignmentOperator()) { 1892 return Sema::CXXCopyAssignment; 1893 } else if (MD->isMoveAssignmentOperator()) { 1894 return Sema::CXXMoveAssignment; 1895 } 1896 1897 return Sema::CXXInvalid; 1898} 1899 1900/// canRedefineFunction - checks if a function can be redefined. Currently, 1901/// only extern inline functions can be redefined, and even then only in 1902/// GNU89 mode. 1903static bool canRedefineFunction(const FunctionDecl *FD, 1904 const LangOptions& LangOpts) { 1905 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1906 !LangOpts.CPlusPlus && 1907 FD->isInlineSpecified() && 1908 FD->getStorageClass() == SC_Extern); 1909} 1910 1911/// MergeFunctionDecl - We just parsed a function 'New' from 1912/// declarator D which has the same name and scope as a previous 1913/// declaration 'Old'. Figure out how to resolve this situation, 1914/// merging decls or emitting diagnostics as appropriate. 1915/// 1916/// In C++, New and Old must be declarations that are not 1917/// overloaded. Use IsOverload to determine whether New and Old are 1918/// overloaded, and to select the Old declaration that New should be 1919/// merged with. 1920/// 1921/// Returns true if there was an error, false otherwise. 1922bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) { 1923 // Verify the old decl was also a function. 1924 FunctionDecl *Old = 0; 1925 if (FunctionTemplateDecl *OldFunctionTemplate 1926 = dyn_cast<FunctionTemplateDecl>(OldD)) 1927 Old = OldFunctionTemplate->getTemplatedDecl(); 1928 else 1929 Old = dyn_cast<FunctionDecl>(OldD); 1930 if (!Old) { 1931 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1932 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1933 Diag(Shadow->getTargetDecl()->getLocation(), 1934 diag::note_using_decl_target); 1935 Diag(Shadow->getUsingDecl()->getLocation(), 1936 diag::note_using_decl) << 0; 1937 return true; 1938 } 1939 1940 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1941 << New->getDeclName(); 1942 Diag(OldD->getLocation(), diag::note_previous_definition); 1943 return true; 1944 } 1945 1946 // Determine whether the previous declaration was a definition, 1947 // implicit declaration, or a declaration. 1948 diag::kind PrevDiag; 1949 if (Old->isThisDeclarationADefinition()) 1950 PrevDiag = diag::note_previous_definition; 1951 else if (Old->isImplicit()) 1952 PrevDiag = diag::note_previous_implicit_declaration; 1953 else 1954 PrevDiag = diag::note_previous_declaration; 1955 1956 QualType OldQType = Context.getCanonicalType(Old->getType()); 1957 QualType NewQType = Context.getCanonicalType(New->getType()); 1958 1959 // Don't complain about this if we're in GNU89 mode and the old function 1960 // is an extern inline function. 1961 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1962 New->getStorageClass() == SC_Static && 1963 Old->getStorageClass() != SC_Static && 1964 !canRedefineFunction(Old, getLangOpts())) { 1965 if (getLangOpts().MicrosoftExt) { 1966 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1967 Diag(Old->getLocation(), PrevDiag); 1968 } else { 1969 Diag(New->getLocation(), diag::err_static_non_static) << New; 1970 Diag(Old->getLocation(), PrevDiag); 1971 return true; 1972 } 1973 } 1974 1975 // If a function is first declared with a calling convention, but is 1976 // later declared or defined without one, the second decl assumes the 1977 // calling convention of the first. 1978 // 1979 // For the new decl, we have to look at the NON-canonical type to tell the 1980 // difference between a function that really doesn't have a calling 1981 // convention and one that is declared cdecl. That's because in 1982 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1983 // because it is the default calling convention. 1984 // 1985 // Note also that we DO NOT return at this point, because we still have 1986 // other tests to run. 1987 const FunctionType *OldType = cast<FunctionType>(OldQType); 1988 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1989 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1990 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1991 bool RequiresAdjustment = false; 1992 if (OldTypeInfo.getCC() != CC_Default && 1993 NewTypeInfo.getCC() == CC_Default) { 1994 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1995 RequiresAdjustment = true; 1996 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1997 NewTypeInfo.getCC())) { 1998 // Calling conventions really aren't compatible, so complain. 1999 Diag(New->getLocation(), diag::err_cconv_change) 2000 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 2001 << (OldTypeInfo.getCC() == CC_Default) 2002 << (OldTypeInfo.getCC() == CC_Default ? "" : 2003 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 2004 Diag(Old->getLocation(), diag::note_previous_declaration); 2005 return true; 2006 } 2007 2008 // FIXME: diagnose the other way around? 2009 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 2010 NewTypeInfo = NewTypeInfo.withNoReturn(true); 2011 RequiresAdjustment = true; 2012 } 2013 2014 // Merge regparm attribute. 2015 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 2016 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 2017 if (NewTypeInfo.getHasRegParm()) { 2018 Diag(New->getLocation(), diag::err_regparm_mismatch) 2019 << NewType->getRegParmType() 2020 << OldType->getRegParmType(); 2021 Diag(Old->getLocation(), diag::note_previous_declaration); 2022 return true; 2023 } 2024 2025 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 2026 RequiresAdjustment = true; 2027 } 2028 2029 // Merge ns_returns_retained attribute. 2030 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 2031 if (NewTypeInfo.getProducesResult()) { 2032 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 2033 Diag(Old->getLocation(), diag::note_previous_declaration); 2034 return true; 2035 } 2036 2037 NewTypeInfo = NewTypeInfo.withProducesResult(true); 2038 RequiresAdjustment = true; 2039 } 2040 2041 if (RequiresAdjustment) { 2042 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 2043 New->setType(QualType(NewType, 0)); 2044 NewQType = Context.getCanonicalType(New->getType()); 2045 } 2046 2047 if (getLangOpts().CPlusPlus) { 2048 // (C++98 13.1p2): 2049 // Certain function declarations cannot be overloaded: 2050 // -- Function declarations that differ only in the return type 2051 // cannot be overloaded. 2052 QualType OldReturnType = OldType->getResultType(); 2053 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 2054 QualType ResQT; 2055 if (OldReturnType != NewReturnType) { 2056 if (NewReturnType->isObjCObjectPointerType() 2057 && OldReturnType->isObjCObjectPointerType()) 2058 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 2059 if (ResQT.isNull()) { 2060 if (New->isCXXClassMember() && New->isOutOfLine()) 2061 Diag(New->getLocation(), 2062 diag::err_member_def_does_not_match_ret_type) << New; 2063 else 2064 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 2065 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2066 return true; 2067 } 2068 else 2069 NewQType = ResQT; 2070 } 2071 2072 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 2073 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 2074 if (OldMethod && NewMethod) { 2075 // Preserve triviality. 2076 NewMethod->setTrivial(OldMethod->isTrivial()); 2077 2078 // MSVC allows explicit template specialization at class scope: 2079 // 2 CXMethodDecls referring to the same function will be injected. 2080 // We don't want a redeclartion error. 2081 bool IsClassScopeExplicitSpecialization = 2082 OldMethod->isFunctionTemplateSpecialization() && 2083 NewMethod->isFunctionTemplateSpecialization(); 2084 bool isFriend = NewMethod->getFriendObjectKind(); 2085 2086 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 2087 !IsClassScopeExplicitSpecialization) { 2088 // -- Member function declarations with the same name and the 2089 // same parameter types cannot be overloaded if any of them 2090 // is a static member function declaration. 2091 if (OldMethod->isStatic() || NewMethod->isStatic()) { 2092 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 2093 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2094 return true; 2095 } 2096 2097 // C++ [class.mem]p1: 2098 // [...] A member shall not be declared twice in the 2099 // member-specification, except that a nested class or member 2100 // class template can be declared and then later defined. 2101 if (ActiveTemplateInstantiations.empty()) { 2102 unsigned NewDiag; 2103 if (isa<CXXConstructorDecl>(OldMethod)) 2104 NewDiag = diag::err_constructor_redeclared; 2105 else if (isa<CXXDestructorDecl>(NewMethod)) 2106 NewDiag = diag::err_destructor_redeclared; 2107 else if (isa<CXXConversionDecl>(NewMethod)) 2108 NewDiag = diag::err_conv_function_redeclared; 2109 else 2110 NewDiag = diag::err_member_redeclared; 2111 2112 Diag(New->getLocation(), NewDiag); 2113 } else { 2114 Diag(New->getLocation(), diag::err_member_redeclared_in_instantiation) 2115 << New << New->getType(); 2116 } 2117 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2118 2119 // Complain if this is an explicit declaration of a special 2120 // member that was initially declared implicitly. 2121 // 2122 // As an exception, it's okay to befriend such methods in order 2123 // to permit the implicit constructor/destructor/operator calls. 2124 } else if (OldMethod->isImplicit()) { 2125 if (isFriend) { 2126 NewMethod->setImplicit(); 2127 } else { 2128 Diag(NewMethod->getLocation(), 2129 diag::err_definition_of_implicitly_declared_member) 2130 << New << getSpecialMember(OldMethod); 2131 return true; 2132 } 2133 } else if (OldMethod->isExplicitlyDefaulted() && !isFriend) { 2134 Diag(NewMethod->getLocation(), 2135 diag::err_definition_of_explicitly_defaulted_member) 2136 << getSpecialMember(OldMethod); 2137 return true; 2138 } 2139 } 2140 2141 // (C++98 8.3.5p3): 2142 // All declarations for a function shall agree exactly in both the 2143 // return type and the parameter-type-list. 2144 // We also want to respect all the extended bits except noreturn. 2145 2146 // noreturn should now match unless the old type info didn't have it. 2147 QualType OldQTypeForComparison = OldQType; 2148 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 2149 assert(OldQType == QualType(OldType, 0)); 2150 const FunctionType *OldTypeForComparison 2151 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 2152 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 2153 assert(OldQTypeForComparison.isCanonical()); 2154 } 2155 2156 if (OldQTypeForComparison == NewQType) 2157 return MergeCompatibleFunctionDecls(New, Old, S); 2158 2159 // Fall through for conflicting redeclarations and redefinitions. 2160 } 2161 2162 // C: Function types need to be compatible, not identical. This handles 2163 // duplicate function decls like "void f(int); void f(enum X);" properly. 2164 if (!getLangOpts().CPlusPlus && 2165 Context.typesAreCompatible(OldQType, NewQType)) { 2166 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 2167 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 2168 const FunctionProtoType *OldProto = 0; 2169 if (isa<FunctionNoProtoType>(NewFuncType) && 2170 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 2171 // The old declaration provided a function prototype, but the 2172 // new declaration does not. Merge in the prototype. 2173 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 2174 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 2175 OldProto->arg_type_end()); 2176 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 2177 ParamTypes.data(), ParamTypes.size(), 2178 OldProto->getExtProtoInfo()); 2179 New->setType(NewQType); 2180 New->setHasInheritedPrototype(); 2181 2182 // Synthesize a parameter for each argument type. 2183 SmallVector<ParmVarDecl*, 16> Params; 2184 for (FunctionProtoType::arg_type_iterator 2185 ParamType = OldProto->arg_type_begin(), 2186 ParamEnd = OldProto->arg_type_end(); 2187 ParamType != ParamEnd; ++ParamType) { 2188 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 2189 SourceLocation(), 2190 SourceLocation(), 0, 2191 *ParamType, /*TInfo=*/0, 2192 SC_None, SC_None, 2193 0); 2194 Param->setScopeInfo(0, Params.size()); 2195 Param->setImplicit(); 2196 Params.push_back(Param); 2197 } 2198 2199 New->setParams(Params); 2200 } 2201 2202 return MergeCompatibleFunctionDecls(New, Old, S); 2203 } 2204 2205 // GNU C permits a K&R definition to follow a prototype declaration 2206 // if the declared types of the parameters in the K&R definition 2207 // match the types in the prototype declaration, even when the 2208 // promoted types of the parameters from the K&R definition differ 2209 // from the types in the prototype. GCC then keeps the types from 2210 // the prototype. 2211 // 2212 // If a variadic prototype is followed by a non-variadic K&R definition, 2213 // the K&R definition becomes variadic. This is sort of an edge case, but 2214 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2215 // C99 6.9.1p8. 2216 if (!getLangOpts().CPlusPlus && 2217 Old->hasPrototype() && !New->hasPrototype() && 2218 New->getType()->getAs<FunctionProtoType>() && 2219 Old->getNumParams() == New->getNumParams()) { 2220 SmallVector<QualType, 16> ArgTypes; 2221 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2222 const FunctionProtoType *OldProto 2223 = Old->getType()->getAs<FunctionProtoType>(); 2224 const FunctionProtoType *NewProto 2225 = New->getType()->getAs<FunctionProtoType>(); 2226 2227 // Determine whether this is the GNU C extension. 2228 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2229 NewProto->getResultType()); 2230 bool LooseCompatible = !MergedReturn.isNull(); 2231 for (unsigned Idx = 0, End = Old->getNumParams(); 2232 LooseCompatible && Idx != End; ++Idx) { 2233 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2234 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2235 if (Context.typesAreCompatible(OldParm->getType(), 2236 NewProto->getArgType(Idx))) { 2237 ArgTypes.push_back(NewParm->getType()); 2238 } else if (Context.typesAreCompatible(OldParm->getType(), 2239 NewParm->getType(), 2240 /*CompareUnqualified=*/true)) { 2241 GNUCompatibleParamWarning Warn 2242 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2243 Warnings.push_back(Warn); 2244 ArgTypes.push_back(NewParm->getType()); 2245 } else 2246 LooseCompatible = false; 2247 } 2248 2249 if (LooseCompatible) { 2250 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2251 Diag(Warnings[Warn].NewParm->getLocation(), 2252 diag::ext_param_promoted_not_compatible_with_prototype) 2253 << Warnings[Warn].PromotedType 2254 << Warnings[Warn].OldParm->getType(); 2255 if (Warnings[Warn].OldParm->getLocation().isValid()) 2256 Diag(Warnings[Warn].OldParm->getLocation(), 2257 diag::note_previous_declaration); 2258 } 2259 2260 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2261 ArgTypes.size(), 2262 OldProto->getExtProtoInfo())); 2263 return MergeCompatibleFunctionDecls(New, Old, S); 2264 } 2265 2266 // Fall through to diagnose conflicting types. 2267 } 2268 2269 // A function that has already been declared has been redeclared or defined 2270 // with a different type- show appropriate diagnostic 2271 if (unsigned BuiltinID = Old->getBuiltinID()) { 2272 // The user has declared a builtin function with an incompatible 2273 // signature. 2274 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2275 // The function the user is redeclaring is a library-defined 2276 // function like 'malloc' or 'printf'. Warn about the 2277 // redeclaration, then pretend that we don't know about this 2278 // library built-in. 2279 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2280 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2281 << Old << Old->getType(); 2282 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2283 Old->setInvalidDecl(); 2284 return false; 2285 } 2286 2287 PrevDiag = diag::note_previous_builtin_declaration; 2288 } 2289 2290 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2291 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2292 return true; 2293} 2294 2295/// \brief Completes the merge of two function declarations that are 2296/// known to be compatible. 2297/// 2298/// This routine handles the merging of attributes and other 2299/// properties of function declarations form the old declaration to 2300/// the new declaration, once we know that New is in fact a 2301/// redeclaration of Old. 2302/// 2303/// \returns false 2304bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old, 2305 Scope *S) { 2306 // Merge the attributes 2307 mergeDeclAttributes(New, Old); 2308 2309 // Merge the storage class. 2310 if (Old->getStorageClass() != SC_Extern && 2311 Old->getStorageClass() != SC_None) 2312 New->setStorageClass(Old->getStorageClass()); 2313 2314 // Merge "pure" flag. 2315 if (Old->isPure()) 2316 New->setPure(); 2317 2318 // Merge attributes from the parameters. These can mismatch with K&R 2319 // declarations. 2320 if (New->getNumParams() == Old->getNumParams()) 2321 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2322 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2323 Context); 2324 2325 if (getLangOpts().CPlusPlus) 2326 return MergeCXXFunctionDecl(New, Old, S); 2327 2328 return false; 2329} 2330 2331 2332void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2333 ObjCMethodDecl *oldMethod) { 2334 2335 // Merge the attributes, including deprecated/unavailable 2336 mergeDeclAttributes(newMethod, oldMethod, /* mergeDeprecation */true); 2337 2338 // Merge attributes from the parameters. 2339 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(), 2340 oe = oldMethod->param_end(); 2341 for (ObjCMethodDecl::param_iterator 2342 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2343 ni != ne && oi != oe; ++ni, ++oi) 2344 mergeParamDeclAttributes(*ni, *oi, Context); 2345 2346 CheckObjCMethodOverride(newMethod, oldMethod, true); 2347} 2348 2349/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2350/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2351/// emitting diagnostics as appropriate. 2352/// 2353/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2354/// to here in AddInitializerToDecl. We can't check them before the initializer 2355/// is attached. 2356void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2357 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2358 return; 2359 2360 QualType MergedT; 2361 if (getLangOpts().CPlusPlus) { 2362 AutoType *AT = New->getType()->getContainedAutoType(); 2363 if (AT && !AT->isDeduced()) { 2364 // We don't know what the new type is until the initializer is attached. 2365 return; 2366 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2367 // These could still be something that needs exception specs checked. 2368 return MergeVarDeclExceptionSpecs(New, Old); 2369 } 2370 // C++ [basic.link]p10: 2371 // [...] the types specified by all declarations referring to a given 2372 // object or function shall be identical, except that declarations for an 2373 // array object can specify array types that differ by the presence or 2374 // absence of a major array bound (8.3.4). 2375 else if (Old->getType()->isIncompleteArrayType() && 2376 New->getType()->isArrayType()) { 2377 CanQual<ArrayType> OldArray 2378 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2379 CanQual<ArrayType> NewArray 2380 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2381 if (OldArray->getElementType() == NewArray->getElementType()) 2382 MergedT = New->getType(); 2383 } else if (Old->getType()->isArrayType() && 2384 New->getType()->isIncompleteArrayType()) { 2385 CanQual<ArrayType> OldArray 2386 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2387 CanQual<ArrayType> NewArray 2388 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2389 if (OldArray->getElementType() == NewArray->getElementType()) 2390 MergedT = Old->getType(); 2391 } else if (New->getType()->isObjCObjectPointerType() 2392 && Old->getType()->isObjCObjectPointerType()) { 2393 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2394 Old->getType()); 2395 } 2396 } else { 2397 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2398 } 2399 if (MergedT.isNull()) { 2400 Diag(New->getLocation(), diag::err_redefinition_different_type) 2401 << New->getDeclName(); 2402 Diag(Old->getLocation(), diag::note_previous_definition); 2403 return New->setInvalidDecl(); 2404 } 2405 New->setType(MergedT); 2406} 2407 2408/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2409/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2410/// situation, merging decls or emitting diagnostics as appropriate. 2411/// 2412/// Tentative definition rules (C99 6.9.2p2) are checked by 2413/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2414/// definitions here, since the initializer hasn't been attached. 2415/// 2416void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2417 // If the new decl is already invalid, don't do any other checking. 2418 if (New->isInvalidDecl()) 2419 return; 2420 2421 // Verify the old decl was also a variable. 2422 VarDecl *Old = 0; 2423 if (!Previous.isSingleResult() || 2424 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2425 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2426 << New->getDeclName(); 2427 Diag(Previous.getRepresentativeDecl()->getLocation(), 2428 diag::note_previous_definition); 2429 return New->setInvalidDecl(); 2430 } 2431 2432 // C++ [class.mem]p1: 2433 // A member shall not be declared twice in the member-specification [...] 2434 // 2435 // Here, we need only consider static data members. 2436 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2437 Diag(New->getLocation(), diag::err_duplicate_member) 2438 << New->getIdentifier(); 2439 Diag(Old->getLocation(), diag::note_previous_declaration); 2440 New->setInvalidDecl(); 2441 } 2442 2443 mergeDeclAttributes(New, Old); 2444 // Warn if an already-declared variable is made a weak_import in a subsequent 2445 // declaration 2446 if (New->getAttr<WeakImportAttr>() && 2447 Old->getStorageClass() == SC_None && 2448 !Old->getAttr<WeakImportAttr>()) { 2449 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2450 Diag(Old->getLocation(), diag::note_previous_definition); 2451 // Remove weak_import attribute on new declaration. 2452 New->dropAttr<WeakImportAttr>(); 2453 } 2454 2455 // Merge the types. 2456 MergeVarDeclTypes(New, Old); 2457 if (New->isInvalidDecl()) 2458 return; 2459 2460 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2461 if (New->getStorageClass() == SC_Static && 2462 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2463 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2464 Diag(Old->getLocation(), diag::note_previous_definition); 2465 return New->setInvalidDecl(); 2466 } 2467 // C99 6.2.2p4: 2468 // For an identifier declared with the storage-class specifier 2469 // extern in a scope in which a prior declaration of that 2470 // identifier is visible,23) if the prior declaration specifies 2471 // internal or external linkage, the linkage of the identifier at 2472 // the later declaration is the same as the linkage specified at 2473 // the prior declaration. If no prior declaration is visible, or 2474 // if the prior declaration specifies no linkage, then the 2475 // identifier has external linkage. 2476 if (New->hasExternalStorage() && Old->hasLinkage()) 2477 /* Okay */; 2478 else if (New->getStorageClass() != SC_Static && 2479 Old->getStorageClass() == SC_Static) { 2480 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2481 Diag(Old->getLocation(), diag::note_previous_definition); 2482 return New->setInvalidDecl(); 2483 } 2484 2485 // Check if extern is followed by non-extern and vice-versa. 2486 if (New->hasExternalStorage() && 2487 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2488 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2489 Diag(Old->getLocation(), diag::note_previous_definition); 2490 return New->setInvalidDecl(); 2491 } 2492 if (Old->hasExternalStorage() && 2493 !New->hasLinkage() && New->isLocalVarDecl()) { 2494 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2495 Diag(Old->getLocation(), diag::note_previous_definition); 2496 return New->setInvalidDecl(); 2497 } 2498 2499 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2500 2501 // FIXME: The test for external storage here seems wrong? We still 2502 // need to check for mismatches. 2503 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2504 // Don't complain about out-of-line definitions of static members. 2505 !(Old->getLexicalDeclContext()->isRecord() && 2506 !New->getLexicalDeclContext()->isRecord())) { 2507 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2508 Diag(Old->getLocation(), diag::note_previous_definition); 2509 return New->setInvalidDecl(); 2510 } 2511 2512 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2513 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2514 Diag(Old->getLocation(), diag::note_previous_definition); 2515 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2516 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2517 Diag(Old->getLocation(), diag::note_previous_definition); 2518 } 2519 2520 // C++ doesn't have tentative definitions, so go right ahead and check here. 2521 const VarDecl *Def; 2522 if (getLangOpts().CPlusPlus && 2523 New->isThisDeclarationADefinition() == VarDecl::Definition && 2524 (Def = Old->getDefinition())) { 2525 Diag(New->getLocation(), diag::err_redefinition) 2526 << New->getDeclName(); 2527 Diag(Def->getLocation(), diag::note_previous_definition); 2528 New->setInvalidDecl(); 2529 return; 2530 } 2531 // c99 6.2.2 P4. 2532 // For an identifier declared with the storage-class specifier extern in a 2533 // scope in which a prior declaration of that identifier is visible, if 2534 // the prior declaration specifies internal or external linkage, the linkage 2535 // of the identifier at the later declaration is the same as the linkage 2536 // specified at the prior declaration. 2537 // FIXME. revisit this code. 2538 if (New->hasExternalStorage() && 2539 Old->getLinkage() == InternalLinkage && 2540 New->getDeclContext() == Old->getDeclContext()) 2541 New->setStorageClass(Old->getStorageClass()); 2542 2543 // Keep a chain of previous declarations. 2544 New->setPreviousDeclaration(Old); 2545 2546 // Inherit access appropriately. 2547 New->setAccess(Old->getAccess()); 2548} 2549 2550/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2551/// no declarator (e.g. "struct foo;") is parsed. 2552Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2553 DeclSpec &DS) { 2554 return ParsedFreeStandingDeclSpec(S, AS, DS, 2555 MultiTemplateParamsArg(*this, 0, 0)); 2556} 2557 2558/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2559/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2560/// parameters to cope with template friend declarations. 2561Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2562 DeclSpec &DS, 2563 MultiTemplateParamsArg TemplateParams) { 2564 Decl *TagD = 0; 2565 TagDecl *Tag = 0; 2566 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2567 DS.getTypeSpecType() == DeclSpec::TST_struct || 2568 DS.getTypeSpecType() == DeclSpec::TST_union || 2569 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2570 TagD = DS.getRepAsDecl(); 2571 2572 if (!TagD) // We probably had an error 2573 return 0; 2574 2575 // Note that the above type specs guarantee that the 2576 // type rep is a Decl, whereas in many of the others 2577 // it's a Type. 2578 if (isa<TagDecl>(TagD)) 2579 Tag = cast<TagDecl>(TagD); 2580 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2581 Tag = CTD->getTemplatedDecl(); 2582 } 2583 2584 if (Tag) { 2585 Tag->setFreeStanding(); 2586 if (Tag->isInvalidDecl()) 2587 return Tag; 2588 } 2589 2590 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2591 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2592 // or incomplete types shall not be restrict-qualified." 2593 if (TypeQuals & DeclSpec::TQ_restrict) 2594 Diag(DS.getRestrictSpecLoc(), 2595 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2596 << DS.getSourceRange(); 2597 } 2598 2599 if (DS.isConstexprSpecified()) { 2600 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2601 // and definitions of functions and variables. 2602 if (Tag) 2603 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2604 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2605 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2606 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2607 else 2608 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2609 // Don't emit warnings after this error. 2610 return TagD; 2611 } 2612 2613 if (DS.isFriendSpecified()) { 2614 // If we're dealing with a decl but not a TagDecl, assume that 2615 // whatever routines created it handled the friendship aspect. 2616 if (TagD && !Tag) 2617 return 0; 2618 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2619 } 2620 2621 // Track whether we warned about the fact that there aren't any 2622 // declarators. 2623 bool emittedWarning = false; 2624 2625 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2626 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2627 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2628 if (getLangOpts().CPlusPlus || 2629 Record->getDeclContext()->isRecord()) 2630 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2631 2632 Diag(DS.getLocStart(), diag::ext_no_declarators) 2633 << DS.getSourceRange(); 2634 emittedWarning = true; 2635 } 2636 } 2637 2638 // Check for Microsoft C extension: anonymous struct. 2639 if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus && 2640 CurContext->isRecord() && 2641 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2642 // Handle 2 kinds of anonymous struct: 2643 // struct STRUCT; 2644 // and 2645 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2646 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2647 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2648 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2649 DS.getRepAsType().get()->isStructureType())) { 2650 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct) 2651 << DS.getSourceRange(); 2652 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2653 } 2654 } 2655 2656 if (getLangOpts().CPlusPlus && 2657 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2658 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2659 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2660 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2661 Diag(Enum->getLocation(), diag::ext_no_declarators) 2662 << DS.getSourceRange(); 2663 emittedWarning = true; 2664 } 2665 2666 // Skip all the checks below if we have a type error. 2667 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2668 2669 if (!DS.isMissingDeclaratorOk()) { 2670 // Warn about typedefs of enums without names, since this is an 2671 // extension in both Microsoft and GNU. 2672 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2673 Tag && isa<EnumDecl>(Tag)) { 2674 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name) 2675 << DS.getSourceRange(); 2676 return Tag; 2677 } 2678 2679 Diag(DS.getLocStart(), diag::ext_no_declarators) 2680 << DS.getSourceRange(); 2681 emittedWarning = true; 2682 } 2683 2684 // We're going to complain about a bunch of spurious specifiers; 2685 // only do this if we're declaring a tag, because otherwise we 2686 // should be getting diag::ext_no_declarators. 2687 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2688 return TagD; 2689 2690 // Note that a linkage-specification sets a storage class, but 2691 // 'extern "C" struct foo;' is actually valid and not theoretically 2692 // useless. 2693 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2694 if (!DS.isExternInLinkageSpec()) 2695 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2696 << DeclSpec::getSpecifierName(scs); 2697 2698 if (DS.isThreadSpecified()) 2699 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2700 if (DS.getTypeQualifiers()) { 2701 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2702 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2703 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2704 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2705 // Restrict is covered above. 2706 } 2707 if (DS.isInlineSpecified()) 2708 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2709 if (DS.isVirtualSpecified()) 2710 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2711 if (DS.isExplicitSpecified()) 2712 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2713 2714 if (DS.isModulePrivateSpecified() && 2715 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2716 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2717 << Tag->getTagKind() 2718 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2719 2720 // Warn about ignored type attributes, for example: 2721 // __attribute__((aligned)) struct A; 2722 // Attributes should be placed after tag to apply to type declaration. 2723 if (!DS.getAttributes().empty()) { 2724 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2725 if (TypeSpecType == DeclSpec::TST_class || 2726 TypeSpecType == DeclSpec::TST_struct || 2727 TypeSpecType == DeclSpec::TST_union || 2728 TypeSpecType == DeclSpec::TST_enum) { 2729 AttributeList* attrs = DS.getAttributes().getList(); 2730 while (attrs) { 2731 Diag(attrs->getScopeLoc(), 2732 diag::warn_declspec_attribute_ignored) 2733 << attrs->getName() 2734 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2735 TypeSpecType == DeclSpec::TST_struct ? 1 : 2736 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2737 attrs = attrs->getNext(); 2738 } 2739 } 2740 } 2741 2742 ActOnDocumentableDecl(TagD); 2743 2744 return TagD; 2745} 2746 2747/// We are trying to inject an anonymous member into the given scope; 2748/// check if there's an existing declaration that can't be overloaded. 2749/// 2750/// \return true if this is a forbidden redeclaration 2751static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2752 Scope *S, 2753 DeclContext *Owner, 2754 DeclarationName Name, 2755 SourceLocation NameLoc, 2756 unsigned diagnostic) { 2757 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2758 Sema::ForRedeclaration); 2759 if (!SemaRef.LookupName(R, S)) return false; 2760 2761 if (R.getAsSingle<TagDecl>()) 2762 return false; 2763 2764 // Pick a representative declaration. 2765 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2766 assert(PrevDecl && "Expected a non-null Decl"); 2767 2768 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2769 return false; 2770 2771 SemaRef.Diag(NameLoc, diagnostic) << Name; 2772 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2773 2774 return true; 2775} 2776 2777/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2778/// anonymous struct or union AnonRecord into the owning context Owner 2779/// and scope S. This routine will be invoked just after we realize 2780/// that an unnamed union or struct is actually an anonymous union or 2781/// struct, e.g., 2782/// 2783/// @code 2784/// union { 2785/// int i; 2786/// float f; 2787/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2788/// // f into the surrounding scope.x 2789/// @endcode 2790/// 2791/// This routine is recursive, injecting the names of nested anonymous 2792/// structs/unions into the owning context and scope as well. 2793static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2794 DeclContext *Owner, 2795 RecordDecl *AnonRecord, 2796 AccessSpecifier AS, 2797 SmallVector<NamedDecl*, 2> &Chaining, 2798 bool MSAnonStruct) { 2799 unsigned diagKind 2800 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2801 : diag::err_anonymous_struct_member_redecl; 2802 2803 bool Invalid = false; 2804 2805 // Look every FieldDecl and IndirectFieldDecl with a name. 2806 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2807 DEnd = AnonRecord->decls_end(); 2808 D != DEnd; ++D) { 2809 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2810 cast<NamedDecl>(*D)->getDeclName()) { 2811 ValueDecl *VD = cast<ValueDecl>(*D); 2812 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2813 VD->getLocation(), diagKind)) { 2814 // C++ [class.union]p2: 2815 // The names of the members of an anonymous union shall be 2816 // distinct from the names of any other entity in the 2817 // scope in which the anonymous union is declared. 2818 Invalid = true; 2819 } else { 2820 // C++ [class.union]p2: 2821 // For the purpose of name lookup, after the anonymous union 2822 // definition, the members of the anonymous union are 2823 // considered to have been defined in the scope in which the 2824 // anonymous union is declared. 2825 unsigned OldChainingSize = Chaining.size(); 2826 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2827 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2828 PE = IF->chain_end(); PI != PE; ++PI) 2829 Chaining.push_back(*PI); 2830 else 2831 Chaining.push_back(VD); 2832 2833 assert(Chaining.size() >= 2); 2834 NamedDecl **NamedChain = 2835 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2836 for (unsigned i = 0; i < Chaining.size(); i++) 2837 NamedChain[i] = Chaining[i]; 2838 2839 IndirectFieldDecl* IndirectField = 2840 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2841 VD->getIdentifier(), VD->getType(), 2842 NamedChain, Chaining.size()); 2843 2844 IndirectField->setAccess(AS); 2845 IndirectField->setImplicit(); 2846 SemaRef.PushOnScopeChains(IndirectField, S); 2847 2848 // That includes picking up the appropriate access specifier. 2849 if (AS != AS_none) IndirectField->setAccess(AS); 2850 2851 Chaining.resize(OldChainingSize); 2852 } 2853 } 2854 } 2855 2856 return Invalid; 2857} 2858 2859/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2860/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2861/// illegal input values are mapped to SC_None. 2862static StorageClass 2863StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2864 switch (StorageClassSpec) { 2865 case DeclSpec::SCS_unspecified: return SC_None; 2866 case DeclSpec::SCS_extern: return SC_Extern; 2867 case DeclSpec::SCS_static: return SC_Static; 2868 case DeclSpec::SCS_auto: return SC_Auto; 2869 case DeclSpec::SCS_register: return SC_Register; 2870 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2871 // Illegal SCSs map to None: error reporting is up to the caller. 2872 case DeclSpec::SCS_mutable: // Fall through. 2873 case DeclSpec::SCS_typedef: return SC_None; 2874 } 2875 llvm_unreachable("unknown storage class specifier"); 2876} 2877 2878/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2879/// a StorageClass. Any error reporting is up to the caller: 2880/// illegal input values are mapped to SC_None. 2881static StorageClass 2882StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2883 switch (StorageClassSpec) { 2884 case DeclSpec::SCS_unspecified: return SC_None; 2885 case DeclSpec::SCS_extern: return SC_Extern; 2886 case DeclSpec::SCS_static: return SC_Static; 2887 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2888 // Illegal SCSs map to None: error reporting is up to the caller. 2889 case DeclSpec::SCS_auto: // Fall through. 2890 case DeclSpec::SCS_mutable: // Fall through. 2891 case DeclSpec::SCS_register: // Fall through. 2892 case DeclSpec::SCS_typedef: return SC_None; 2893 } 2894 llvm_unreachable("unknown storage class specifier"); 2895} 2896 2897/// BuildAnonymousStructOrUnion - Handle the declaration of an 2898/// anonymous structure or union. Anonymous unions are a C++ feature 2899/// (C++ [class.union]) and a C11 feature; anonymous structures 2900/// are a C11 feature and GNU C++ extension. 2901Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2902 AccessSpecifier AS, 2903 RecordDecl *Record) { 2904 DeclContext *Owner = Record->getDeclContext(); 2905 2906 // Diagnose whether this anonymous struct/union is an extension. 2907 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11) 2908 Diag(Record->getLocation(), diag::ext_anonymous_union); 2909 else if (!Record->isUnion() && getLangOpts().CPlusPlus) 2910 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2911 else if (!Record->isUnion() && !getLangOpts().C11) 2912 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2913 2914 // C and C++ require different kinds of checks for anonymous 2915 // structs/unions. 2916 bool Invalid = false; 2917 if (getLangOpts().CPlusPlus) { 2918 const char* PrevSpec = 0; 2919 unsigned DiagID; 2920 if (Record->isUnion()) { 2921 // C++ [class.union]p6: 2922 // Anonymous unions declared in a named namespace or in the 2923 // global namespace shall be declared static. 2924 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2925 (isa<TranslationUnitDecl>(Owner) || 2926 (isa<NamespaceDecl>(Owner) && 2927 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2928 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2929 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2930 2931 // Recover by adding 'static'. 2932 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2933 PrevSpec, DiagID); 2934 } 2935 // C++ [class.union]p6: 2936 // A storage class is not allowed in a declaration of an 2937 // anonymous union in a class scope. 2938 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2939 isa<RecordDecl>(Owner)) { 2940 Diag(DS.getStorageClassSpecLoc(), 2941 diag::err_anonymous_union_with_storage_spec) 2942 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2943 2944 // Recover by removing the storage specifier. 2945 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2946 SourceLocation(), 2947 PrevSpec, DiagID); 2948 } 2949 } 2950 2951 // Ignore const/volatile/restrict qualifiers. 2952 if (DS.getTypeQualifiers()) { 2953 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2954 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2955 << Record->isUnion() << 0 2956 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2957 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2958 Diag(DS.getVolatileSpecLoc(), 2959 diag::ext_anonymous_struct_union_qualified) 2960 << Record->isUnion() << 1 2961 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2962 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2963 Diag(DS.getRestrictSpecLoc(), 2964 diag::ext_anonymous_struct_union_qualified) 2965 << Record->isUnion() << 2 2966 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2967 2968 DS.ClearTypeQualifiers(); 2969 } 2970 2971 // C++ [class.union]p2: 2972 // The member-specification of an anonymous union shall only 2973 // define non-static data members. [Note: nested types and 2974 // functions cannot be declared within an anonymous union. ] 2975 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2976 MemEnd = Record->decls_end(); 2977 Mem != MemEnd; ++Mem) { 2978 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2979 // C++ [class.union]p3: 2980 // An anonymous union shall not have private or protected 2981 // members (clause 11). 2982 assert(FD->getAccess() != AS_none); 2983 if (FD->getAccess() != AS_public) { 2984 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2985 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2986 Invalid = true; 2987 } 2988 2989 // C++ [class.union]p1 2990 // An object of a class with a non-trivial constructor, a non-trivial 2991 // copy constructor, a non-trivial destructor, or a non-trivial copy 2992 // assignment operator cannot be a member of a union, nor can an 2993 // array of such objects. 2994 if (CheckNontrivialField(FD)) 2995 Invalid = true; 2996 } else if ((*Mem)->isImplicit()) { 2997 // Any implicit members are fine. 2998 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2999 // This is a type that showed up in an 3000 // elaborated-type-specifier inside the anonymous struct or 3001 // union, but which actually declares a type outside of the 3002 // anonymous struct or union. It's okay. 3003 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 3004 if (!MemRecord->isAnonymousStructOrUnion() && 3005 MemRecord->getDeclName()) { 3006 // Visual C++ allows type definition in anonymous struct or union. 3007 if (getLangOpts().MicrosoftExt) 3008 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 3009 << (int)Record->isUnion(); 3010 else { 3011 // This is a nested type declaration. 3012 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 3013 << (int)Record->isUnion(); 3014 Invalid = true; 3015 } 3016 } 3017 } else if (isa<AccessSpecDecl>(*Mem)) { 3018 // Any access specifier is fine. 3019 } else { 3020 // We have something that isn't a non-static data 3021 // member. Complain about it. 3022 unsigned DK = diag::err_anonymous_record_bad_member; 3023 if (isa<TypeDecl>(*Mem)) 3024 DK = diag::err_anonymous_record_with_type; 3025 else if (isa<FunctionDecl>(*Mem)) 3026 DK = diag::err_anonymous_record_with_function; 3027 else if (isa<VarDecl>(*Mem)) 3028 DK = diag::err_anonymous_record_with_static; 3029 3030 // Visual C++ allows type definition in anonymous struct or union. 3031 if (getLangOpts().MicrosoftExt && 3032 DK == diag::err_anonymous_record_with_type) 3033 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 3034 << (int)Record->isUnion(); 3035 else { 3036 Diag((*Mem)->getLocation(), DK) 3037 << (int)Record->isUnion(); 3038 Invalid = true; 3039 } 3040 } 3041 } 3042 } 3043 3044 if (!Record->isUnion() && !Owner->isRecord()) { 3045 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 3046 << (int)getLangOpts().CPlusPlus; 3047 Invalid = true; 3048 } 3049 3050 // Mock up a declarator. 3051 Declarator Dc(DS, Declarator::MemberContext); 3052 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 3053 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 3054 3055 // Create a declaration for this anonymous struct/union. 3056 NamedDecl *Anon = 0; 3057 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 3058 Anon = FieldDecl::Create(Context, OwningClass, 3059 DS.getLocStart(), 3060 Record->getLocation(), 3061 /*IdentifierInfo=*/0, 3062 Context.getTypeDeclType(Record), 3063 TInfo, 3064 /*BitWidth=*/0, /*Mutable=*/false, 3065 /*InitStyle=*/ICIS_NoInit); 3066 Anon->setAccess(AS); 3067 if (getLangOpts().CPlusPlus) 3068 FieldCollector->Add(cast<FieldDecl>(Anon)); 3069 } else { 3070 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 3071 assert(SCSpec != DeclSpec::SCS_typedef && 3072 "Parser allowed 'typedef' as storage class VarDecl."); 3073 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3074 if (SCSpec == DeclSpec::SCS_mutable) { 3075 // mutable can only appear on non-static class members, so it's always 3076 // an error here 3077 Diag(Record->getLocation(), diag::err_mutable_nonmember); 3078 Invalid = true; 3079 SC = SC_None; 3080 } 3081 SCSpec = DS.getStorageClassSpecAsWritten(); 3082 VarDecl::StorageClass SCAsWritten 3083 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3084 3085 Anon = VarDecl::Create(Context, Owner, 3086 DS.getLocStart(), 3087 Record->getLocation(), /*IdentifierInfo=*/0, 3088 Context.getTypeDeclType(Record), 3089 TInfo, SC, SCAsWritten); 3090 3091 // Default-initialize the implicit variable. This initialization will be 3092 // trivial in almost all cases, except if a union member has an in-class 3093 // initializer: 3094 // union { int n = 0; }; 3095 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 3096 } 3097 Anon->setImplicit(); 3098 3099 // Add the anonymous struct/union object to the current 3100 // context. We'll be referencing this object when we refer to one of 3101 // its members. 3102 Owner->addDecl(Anon); 3103 3104 // Inject the members of the anonymous struct/union into the owning 3105 // context and into the identifier resolver chain for name lookup 3106 // purposes. 3107 SmallVector<NamedDecl*, 2> Chain; 3108 Chain.push_back(Anon); 3109 3110 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 3111 Chain, false)) 3112 Invalid = true; 3113 3114 // Mark this as an anonymous struct/union type. Note that we do not 3115 // do this until after we have already checked and injected the 3116 // members of this anonymous struct/union type, because otherwise 3117 // the members could be injected twice: once by DeclContext when it 3118 // builds its lookup table, and once by 3119 // InjectAnonymousStructOrUnionMembers. 3120 Record->setAnonymousStructOrUnion(true); 3121 3122 if (Invalid) 3123 Anon->setInvalidDecl(); 3124 3125 return Anon; 3126} 3127 3128/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 3129/// Microsoft C anonymous structure. 3130/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 3131/// Example: 3132/// 3133/// struct A { int a; }; 3134/// struct B { struct A; int b; }; 3135/// 3136/// void foo() { 3137/// B var; 3138/// var.a = 3; 3139/// } 3140/// 3141Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 3142 RecordDecl *Record) { 3143 3144 // If there is no Record, get the record via the typedef. 3145 if (!Record) 3146 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 3147 3148 // Mock up a declarator. 3149 Declarator Dc(DS, Declarator::TypeNameContext); 3150 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 3151 assert(TInfo && "couldn't build declarator info for anonymous struct"); 3152 3153 // Create a declaration for this anonymous struct. 3154 NamedDecl* Anon = FieldDecl::Create(Context, 3155 cast<RecordDecl>(CurContext), 3156 DS.getLocStart(), 3157 DS.getLocStart(), 3158 /*IdentifierInfo=*/0, 3159 Context.getTypeDeclType(Record), 3160 TInfo, 3161 /*BitWidth=*/0, /*Mutable=*/false, 3162 /*InitStyle=*/ICIS_NoInit); 3163 Anon->setImplicit(); 3164 3165 // Add the anonymous struct object to the current context. 3166 CurContext->addDecl(Anon); 3167 3168 // Inject the members of the anonymous struct into the current 3169 // context and into the identifier resolver chain for name lookup 3170 // purposes. 3171 SmallVector<NamedDecl*, 2> Chain; 3172 Chain.push_back(Anon); 3173 3174 RecordDecl *RecordDef = Record->getDefinition(); 3175 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 3176 RecordDef, AS_none, 3177 Chain, true)) 3178 Anon->setInvalidDecl(); 3179 3180 return Anon; 3181} 3182 3183/// GetNameForDeclarator - Determine the full declaration name for the 3184/// given Declarator. 3185DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 3186 return GetNameFromUnqualifiedId(D.getName()); 3187} 3188 3189/// \brief Retrieves the declaration name from a parsed unqualified-id. 3190DeclarationNameInfo 3191Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 3192 DeclarationNameInfo NameInfo; 3193 NameInfo.setLoc(Name.StartLocation); 3194 3195 switch (Name.getKind()) { 3196 3197 case UnqualifiedId::IK_ImplicitSelfParam: 3198 case UnqualifiedId::IK_Identifier: 3199 NameInfo.setName(Name.Identifier); 3200 NameInfo.setLoc(Name.StartLocation); 3201 return NameInfo; 3202 3203 case UnqualifiedId::IK_OperatorFunctionId: 3204 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 3205 Name.OperatorFunctionId.Operator)); 3206 NameInfo.setLoc(Name.StartLocation); 3207 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 3208 = Name.OperatorFunctionId.SymbolLocations[0]; 3209 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 3210 = Name.EndLocation.getRawEncoding(); 3211 return NameInfo; 3212 3213 case UnqualifiedId::IK_LiteralOperatorId: 3214 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 3215 Name.Identifier)); 3216 NameInfo.setLoc(Name.StartLocation); 3217 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3218 return NameInfo; 3219 3220 case UnqualifiedId::IK_ConversionFunctionId: { 3221 TypeSourceInfo *TInfo; 3222 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3223 if (Ty.isNull()) 3224 return DeclarationNameInfo(); 3225 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3226 Context.getCanonicalType(Ty))); 3227 NameInfo.setLoc(Name.StartLocation); 3228 NameInfo.setNamedTypeInfo(TInfo); 3229 return NameInfo; 3230 } 3231 3232 case UnqualifiedId::IK_ConstructorName: { 3233 TypeSourceInfo *TInfo; 3234 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3235 if (Ty.isNull()) 3236 return DeclarationNameInfo(); 3237 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3238 Context.getCanonicalType(Ty))); 3239 NameInfo.setLoc(Name.StartLocation); 3240 NameInfo.setNamedTypeInfo(TInfo); 3241 return NameInfo; 3242 } 3243 3244 case UnqualifiedId::IK_ConstructorTemplateId: { 3245 // In well-formed code, we can only have a constructor 3246 // template-id that refers to the current context, so go there 3247 // to find the actual type being constructed. 3248 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3249 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3250 return DeclarationNameInfo(); 3251 3252 // Determine the type of the class being constructed. 3253 QualType CurClassType = Context.getTypeDeclType(CurClass); 3254 3255 // FIXME: Check two things: that the template-id names the same type as 3256 // CurClassType, and that the template-id does not occur when the name 3257 // was qualified. 3258 3259 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3260 Context.getCanonicalType(CurClassType))); 3261 NameInfo.setLoc(Name.StartLocation); 3262 // FIXME: should we retrieve TypeSourceInfo? 3263 NameInfo.setNamedTypeInfo(0); 3264 return NameInfo; 3265 } 3266 3267 case UnqualifiedId::IK_DestructorName: { 3268 TypeSourceInfo *TInfo; 3269 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3270 if (Ty.isNull()) 3271 return DeclarationNameInfo(); 3272 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3273 Context.getCanonicalType(Ty))); 3274 NameInfo.setLoc(Name.StartLocation); 3275 NameInfo.setNamedTypeInfo(TInfo); 3276 return NameInfo; 3277 } 3278 3279 case UnqualifiedId::IK_TemplateId: { 3280 TemplateName TName = Name.TemplateId->Template.get(); 3281 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3282 return Context.getNameForTemplate(TName, TNameLoc); 3283 } 3284 3285 } // switch (Name.getKind()) 3286 3287 llvm_unreachable("Unknown name kind"); 3288} 3289 3290static QualType getCoreType(QualType Ty) { 3291 do { 3292 if (Ty->isPointerType() || Ty->isReferenceType()) 3293 Ty = Ty->getPointeeType(); 3294 else if (Ty->isArrayType()) 3295 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3296 else 3297 return Ty.withoutLocalFastQualifiers(); 3298 } while (true); 3299} 3300 3301/// hasSimilarParameters - Determine whether the C++ functions Declaration 3302/// and Definition have "nearly" matching parameters. This heuristic is 3303/// used to improve diagnostics in the case where an out-of-line function 3304/// definition doesn't match any declaration within the class or namespace. 3305/// Also sets Params to the list of indices to the parameters that differ 3306/// between the declaration and the definition. If hasSimilarParameters 3307/// returns true and Params is empty, then all of the parameters match. 3308static bool hasSimilarParameters(ASTContext &Context, 3309 FunctionDecl *Declaration, 3310 FunctionDecl *Definition, 3311 llvm::SmallVectorImpl<unsigned> &Params) { 3312 Params.clear(); 3313 if (Declaration->param_size() != Definition->param_size()) 3314 return false; 3315 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3316 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3317 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3318 3319 // The parameter types are identical 3320 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3321 continue; 3322 3323 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3324 QualType DefParamBaseTy = getCoreType(DefParamTy); 3325 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3326 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3327 3328 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3329 (DeclTyName && DeclTyName == DefTyName)) 3330 Params.push_back(Idx); 3331 else // The two parameters aren't even close 3332 return false; 3333 } 3334 3335 return true; 3336} 3337 3338/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3339/// declarator needs to be rebuilt in the current instantiation. 3340/// Any bits of declarator which appear before the name are valid for 3341/// consideration here. That's specifically the type in the decl spec 3342/// and the base type in any member-pointer chunks. 3343static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3344 DeclarationName Name) { 3345 // The types we specifically need to rebuild are: 3346 // - typenames, typeofs, and decltypes 3347 // - types which will become injected class names 3348 // Of course, we also need to rebuild any type referencing such a 3349 // type. It's safest to just say "dependent", but we call out a 3350 // few cases here. 3351 3352 DeclSpec &DS = D.getMutableDeclSpec(); 3353 switch (DS.getTypeSpecType()) { 3354 case DeclSpec::TST_typename: 3355 case DeclSpec::TST_typeofType: 3356 case DeclSpec::TST_decltype: 3357 case DeclSpec::TST_underlyingType: 3358 case DeclSpec::TST_atomic: { 3359 // Grab the type from the parser. 3360 TypeSourceInfo *TSI = 0; 3361 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3362 if (T.isNull() || !T->isDependentType()) break; 3363 3364 // Make sure there's a type source info. This isn't really much 3365 // of a waste; most dependent types should have type source info 3366 // attached already. 3367 if (!TSI) 3368 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3369 3370 // Rebuild the type in the current instantiation. 3371 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3372 if (!TSI) return true; 3373 3374 // Store the new type back in the decl spec. 3375 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3376 DS.UpdateTypeRep(LocType); 3377 break; 3378 } 3379 3380 case DeclSpec::TST_typeofExpr: { 3381 Expr *E = DS.getRepAsExpr(); 3382 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3383 if (Result.isInvalid()) return true; 3384 DS.UpdateExprRep(Result.get()); 3385 break; 3386 } 3387 3388 default: 3389 // Nothing to do for these decl specs. 3390 break; 3391 } 3392 3393 // It doesn't matter what order we do this in. 3394 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3395 DeclaratorChunk &Chunk = D.getTypeObject(I); 3396 3397 // The only type information in the declarator which can come 3398 // before the declaration name is the base type of a member 3399 // pointer. 3400 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3401 continue; 3402 3403 // Rebuild the scope specifier in-place. 3404 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3405 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3406 return true; 3407 } 3408 3409 return false; 3410} 3411 3412Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3413 D.setFunctionDefinitionKind(FDK_Declaration); 3414 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3415 3416 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3417 Dcl && Dcl->getDeclContext()->isFileContext()) 3418 Dcl->setTopLevelDeclInObjCContainer(); 3419 3420 return Dcl; 3421} 3422 3423/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3424/// If T is the name of a class, then each of the following shall have a 3425/// name different from T: 3426/// - every static data member of class T; 3427/// - every member function of class T 3428/// - every member of class T that is itself a type; 3429/// \returns true if the declaration name violates these rules. 3430bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3431 DeclarationNameInfo NameInfo) { 3432 DeclarationName Name = NameInfo.getName(); 3433 3434 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3435 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3436 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3437 return true; 3438 } 3439 3440 return false; 3441} 3442 3443/// \brief Diagnose a declaration whose declarator-id has the given 3444/// nested-name-specifier. 3445/// 3446/// \param SS The nested-name-specifier of the declarator-id. 3447/// 3448/// \param DC The declaration context to which the nested-name-specifier 3449/// resolves. 3450/// 3451/// \param Name The name of the entity being declared. 3452/// 3453/// \param Loc The location of the name of the entity being declared. 3454/// 3455/// \returns true if we cannot safely recover from this error, false otherwise. 3456bool Sema::diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC, 3457 DeclarationName Name, 3458 SourceLocation Loc) { 3459 DeclContext *Cur = CurContext; 3460 while (isa<LinkageSpecDecl>(Cur)) 3461 Cur = Cur->getParent(); 3462 3463 // C++ [dcl.meaning]p1: 3464 // A declarator-id shall not be qualified except for the definition 3465 // of a member function (9.3) or static data member (9.4) outside of 3466 // its class, the definition or explicit instantiation of a function 3467 // or variable member of a namespace outside of its namespace, or the 3468 // definition of an explicit specialization outside of its namespace, 3469 // or the declaration of a friend function that is a member of 3470 // another class or namespace (11.3). [...] 3471 3472 // The user provided a superfluous scope specifier that refers back to the 3473 // class or namespaces in which the entity is already declared. 3474 // 3475 // class X { 3476 // void X::f(); 3477 // }; 3478 if (Cur->Equals(DC)) { 3479 Diag(Loc, diag::warn_member_extra_qualification) 3480 << Name << FixItHint::CreateRemoval(SS.getRange()); 3481 SS.clear(); 3482 return false; 3483 } 3484 3485 // Check whether the qualifying scope encloses the scope of the original 3486 // declaration. 3487 if (!Cur->Encloses(DC)) { 3488 if (Cur->isRecord()) 3489 Diag(Loc, diag::err_member_qualification) 3490 << Name << SS.getRange(); 3491 else if (isa<TranslationUnitDecl>(DC)) 3492 Diag(Loc, diag::err_invalid_declarator_global_scope) 3493 << Name << SS.getRange(); 3494 else if (isa<FunctionDecl>(Cur)) 3495 Diag(Loc, diag::err_invalid_declarator_in_function) 3496 << Name << SS.getRange(); 3497 else 3498 Diag(Loc, diag::err_invalid_declarator_scope) 3499 << Name << cast<NamedDecl>(Cur) << cast<NamedDecl>(DC) << SS.getRange(); 3500 3501 return true; 3502 } 3503 3504 if (Cur->isRecord()) { 3505 // Cannot qualify members within a class. 3506 Diag(Loc, diag::err_member_qualification) 3507 << Name << SS.getRange(); 3508 SS.clear(); 3509 3510 // C++ constructors and destructors with incorrect scopes can break 3511 // our AST invariants by having the wrong underlying types. If 3512 // that's the case, then drop this declaration entirely. 3513 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3514 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3515 !Context.hasSameType(Name.getCXXNameType(), 3516 Context.getTypeDeclType(cast<CXXRecordDecl>(Cur)))) 3517 return true; 3518 3519 return false; 3520 } 3521 3522 // C++11 [dcl.meaning]p1: 3523 // [...] "The nested-name-specifier of the qualified declarator-id shall 3524 // not begin with a decltype-specifer" 3525 NestedNameSpecifierLoc SpecLoc(SS.getScopeRep(), SS.location_data()); 3526 while (SpecLoc.getPrefix()) 3527 SpecLoc = SpecLoc.getPrefix(); 3528 if (dyn_cast_or_null<DecltypeType>( 3529 SpecLoc.getNestedNameSpecifier()->getAsType())) 3530 Diag(Loc, diag::err_decltype_in_declarator) 3531 << SpecLoc.getTypeLoc().getSourceRange(); 3532 3533 return false; 3534} 3535 3536Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3537 MultiTemplateParamsArg TemplateParamLists) { 3538 // TODO: consider using NameInfo for diagnostic. 3539 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3540 DeclarationName Name = NameInfo.getName(); 3541 3542 // All of these full declarators require an identifier. If it doesn't have 3543 // one, the ParsedFreeStandingDeclSpec action should be used. 3544 if (!Name) { 3545 if (!D.isInvalidType()) // Reject this if we think it is valid. 3546 Diag(D.getDeclSpec().getLocStart(), 3547 diag::err_declarator_need_ident) 3548 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3549 return 0; 3550 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3551 return 0; 3552 3553 // The scope passed in may not be a decl scope. Zip up the scope tree until 3554 // we find one that is. 3555 while ((S->getFlags() & Scope::DeclScope) == 0 || 3556 (S->getFlags() & Scope::TemplateParamScope) != 0) 3557 S = S->getParent(); 3558 3559 DeclContext *DC = CurContext; 3560 if (D.getCXXScopeSpec().isInvalid()) 3561 D.setInvalidType(); 3562 else if (D.getCXXScopeSpec().isSet()) { 3563 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3564 UPPC_DeclarationQualifier)) 3565 return 0; 3566 3567 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3568 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3569 if (!DC) { 3570 // If we could not compute the declaration context, it's because the 3571 // declaration context is dependent but does not refer to a class, 3572 // class template, or class template partial specialization. Complain 3573 // and return early, to avoid the coming semantic disaster. 3574 Diag(D.getIdentifierLoc(), 3575 diag::err_template_qualified_declarator_no_match) 3576 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3577 << D.getCXXScopeSpec().getRange(); 3578 return 0; 3579 } 3580 bool IsDependentContext = DC->isDependentContext(); 3581 3582 if (!IsDependentContext && 3583 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3584 return 0; 3585 3586 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 3587 Diag(D.getIdentifierLoc(), 3588 diag::err_member_def_undefined_record) 3589 << Name << DC << D.getCXXScopeSpec().getRange(); 3590 D.setInvalidType(); 3591 } else if (!D.getDeclSpec().isFriendSpecified()) { 3592 if (diagnoseQualifiedDeclaration(D.getCXXScopeSpec(), DC, 3593 Name, D.getIdentifierLoc())) { 3594 if (DC->isRecord()) 3595 return 0; 3596 3597 D.setInvalidType(); 3598 } 3599 } 3600 3601 // Check whether we need to rebuild the type of the given 3602 // declaration in the current instantiation. 3603 if (EnteringContext && IsDependentContext && 3604 TemplateParamLists.size() != 0) { 3605 ContextRAII SavedContext(*this, DC); 3606 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3607 D.setInvalidType(); 3608 } 3609 } 3610 3611 if (DiagnoseClassNameShadow(DC, NameInfo)) 3612 // If this is a typedef, we'll end up spewing multiple diagnostics. 3613 // Just return early; it's safer. 3614 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3615 return 0; 3616 3617 NamedDecl *New; 3618 3619 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3620 QualType R = TInfo->getType(); 3621 3622 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3623 UPPC_DeclarationType)) 3624 D.setInvalidType(); 3625 3626 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3627 ForRedeclaration); 3628 3629 // See if this is a redefinition of a variable in the same scope. 3630 if (!D.getCXXScopeSpec().isSet()) { 3631 bool IsLinkageLookup = false; 3632 3633 // If the declaration we're planning to build will be a function 3634 // or object with linkage, then look for another declaration with 3635 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3636 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3637 /* Do nothing*/; 3638 else if (R->isFunctionType()) { 3639 if (CurContext->isFunctionOrMethod() || 3640 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3641 IsLinkageLookup = true; 3642 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3643 IsLinkageLookup = true; 3644 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3645 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3646 IsLinkageLookup = true; 3647 3648 if (IsLinkageLookup) 3649 Previous.clear(LookupRedeclarationWithLinkage); 3650 3651 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3652 } else { // Something like "int foo::x;" 3653 LookupQualifiedName(Previous, DC); 3654 3655 // C++ [dcl.meaning]p1: 3656 // When the declarator-id is qualified, the declaration shall refer to a 3657 // previously declared member of the class or namespace to which the 3658 // qualifier refers (or, in the case of a namespace, of an element of the 3659 // inline namespace set of that namespace (7.3.1)) or to a specialization 3660 // thereof; [...] 3661 // 3662 // Note that we already checked the context above, and that we do not have 3663 // enough information to make sure that Previous contains the declaration 3664 // we want to match. For example, given: 3665 // 3666 // class X { 3667 // void f(); 3668 // void f(float); 3669 // }; 3670 // 3671 // void X::f(int) { } // ill-formed 3672 // 3673 // In this case, Previous will point to the overload set 3674 // containing the two f's declared in X, but neither of them 3675 // matches. 3676 3677 // C++ [dcl.meaning]p1: 3678 // [...] the member shall not merely have been introduced by a 3679 // using-declaration in the scope of the class or namespace nominated by 3680 // the nested-name-specifier of the declarator-id. 3681 RemoveUsingDecls(Previous); 3682 } 3683 3684 if (Previous.isSingleResult() && 3685 Previous.getFoundDecl()->isTemplateParameter()) { 3686 // Maybe we will complain about the shadowed template parameter. 3687 if (!D.isInvalidType()) 3688 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3689 Previous.getFoundDecl()); 3690 3691 // Just pretend that we didn't see the previous declaration. 3692 Previous.clear(); 3693 } 3694 3695 // In C++, the previous declaration we find might be a tag type 3696 // (class or enum). In this case, the new declaration will hide the 3697 // tag type. Note that this does does not apply if we're declaring a 3698 // typedef (C++ [dcl.typedef]p4). 3699 if (Previous.isSingleTagDecl() && 3700 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3701 Previous.clear(); 3702 3703 bool AddToScope = true; 3704 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3705 if (TemplateParamLists.size()) { 3706 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3707 return 0; 3708 } 3709 3710 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3711 } else if (R->isFunctionType()) { 3712 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3713 move(TemplateParamLists), 3714 AddToScope); 3715 } else { 3716 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3717 move(TemplateParamLists)); 3718 } 3719 3720 if (New == 0) 3721 return 0; 3722 3723 // If this has an identifier and is not an invalid redeclaration or 3724 // function template specialization, add it to the scope stack. 3725 if (New->getDeclName() && AddToScope && 3726 !(D.isRedeclaration() && New->isInvalidDecl())) 3727 PushOnScopeChains(New, S); 3728 3729 return New; 3730} 3731 3732/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3733/// types into constant array types in certain situations which would otherwise 3734/// be errors (for GCC compatibility). 3735static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3736 ASTContext &Context, 3737 bool &SizeIsNegative, 3738 llvm::APSInt &Oversized) { 3739 // This method tries to turn a variable array into a constant 3740 // array even when the size isn't an ICE. This is necessary 3741 // for compatibility with code that depends on gcc's buggy 3742 // constant expression folding, like struct {char x[(int)(char*)2];} 3743 SizeIsNegative = false; 3744 Oversized = 0; 3745 3746 if (T->isDependentType()) 3747 return QualType(); 3748 3749 QualifierCollector Qs; 3750 const Type *Ty = Qs.strip(T); 3751 3752 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3753 QualType Pointee = PTy->getPointeeType(); 3754 QualType FixedType = 3755 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3756 Oversized); 3757 if (FixedType.isNull()) return FixedType; 3758 FixedType = Context.getPointerType(FixedType); 3759 return Qs.apply(Context, FixedType); 3760 } 3761 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3762 QualType Inner = PTy->getInnerType(); 3763 QualType FixedType = 3764 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3765 Oversized); 3766 if (FixedType.isNull()) return FixedType; 3767 FixedType = Context.getParenType(FixedType); 3768 return Qs.apply(Context, FixedType); 3769 } 3770 3771 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3772 if (!VLATy) 3773 return QualType(); 3774 // FIXME: We should probably handle this case 3775 if (VLATy->getElementType()->isVariablyModifiedType()) 3776 return QualType(); 3777 3778 llvm::APSInt Res; 3779 if (!VLATy->getSizeExpr() || 3780 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3781 return QualType(); 3782 3783 // Check whether the array size is negative. 3784 if (Res.isSigned() && Res.isNegative()) { 3785 SizeIsNegative = true; 3786 return QualType(); 3787 } 3788 3789 // Check whether the array is too large to be addressed. 3790 unsigned ActiveSizeBits 3791 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3792 Res); 3793 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3794 Oversized = Res; 3795 return QualType(); 3796 } 3797 3798 return Context.getConstantArrayType(VLATy->getElementType(), 3799 Res, ArrayType::Normal, 0); 3800} 3801 3802/// \brief Register the given locally-scoped external C declaration so 3803/// that it can be found later for redeclarations 3804void 3805Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3806 const LookupResult &Previous, 3807 Scope *S) { 3808 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3809 "Decl is not a locally-scoped decl!"); 3810 // Note that we have a locally-scoped external with this name. 3811 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3812 3813 if (!Previous.isSingleResult()) 3814 return; 3815 3816 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3817 3818 // If there was a previous declaration of this variable, it may be 3819 // in our identifier chain. Update the identifier chain with the new 3820 // declaration. 3821 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3822 // The previous declaration was found on the identifer resolver 3823 // chain, so remove it from its scope. 3824 3825 if (S->isDeclScope(PrevDecl)) { 3826 // Special case for redeclarations in the SAME scope. 3827 // Because this declaration is going to be added to the identifier chain 3828 // later, we should temporarily take it OFF the chain. 3829 IdResolver.RemoveDecl(ND); 3830 3831 } else { 3832 // Find the scope for the original declaration. 3833 while (S && !S->isDeclScope(PrevDecl)) 3834 S = S->getParent(); 3835 } 3836 3837 if (S) 3838 S->RemoveDecl(PrevDecl); 3839 } 3840} 3841 3842llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3843Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3844 if (ExternalSource) { 3845 // Load locally-scoped external decls from the external source. 3846 SmallVector<NamedDecl *, 4> Decls; 3847 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3848 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3849 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3850 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3851 if (Pos == LocallyScopedExternalDecls.end()) 3852 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3853 } 3854 } 3855 3856 return LocallyScopedExternalDecls.find(Name); 3857} 3858 3859/// \brief Diagnose function specifiers on a declaration of an identifier that 3860/// does not identify a function. 3861void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3862 // FIXME: We should probably indicate the identifier in question to avoid 3863 // confusion for constructs like "inline int a(), b;" 3864 if (D.getDeclSpec().isInlineSpecified()) 3865 Diag(D.getDeclSpec().getInlineSpecLoc(), 3866 diag::err_inline_non_function); 3867 3868 if (D.getDeclSpec().isVirtualSpecified()) 3869 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3870 diag::err_virtual_non_function); 3871 3872 if (D.getDeclSpec().isExplicitSpecified()) 3873 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3874 diag::err_explicit_non_function); 3875} 3876 3877NamedDecl* 3878Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3879 TypeSourceInfo *TInfo, LookupResult &Previous) { 3880 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3881 if (D.getCXXScopeSpec().isSet()) { 3882 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3883 << D.getCXXScopeSpec().getRange(); 3884 D.setInvalidType(); 3885 // Pretend we didn't see the scope specifier. 3886 DC = CurContext; 3887 Previous.clear(); 3888 } 3889 3890 if (getLangOpts().CPlusPlus) { 3891 // Check that there are no default arguments (C++ only). 3892 CheckExtraCXXDefaultArguments(D); 3893 } 3894 3895 DiagnoseFunctionSpecifiers(D); 3896 3897 if (D.getDeclSpec().isThreadSpecified()) 3898 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3899 if (D.getDeclSpec().isConstexprSpecified()) 3900 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3901 << 1; 3902 3903 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3904 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3905 << D.getName().getSourceRange(); 3906 return 0; 3907 } 3908 3909 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3910 if (!NewTD) return 0; 3911 3912 // Handle attributes prior to checking for duplicates in MergeVarDecl 3913 ProcessDeclAttributes(S, NewTD, D); 3914 3915 CheckTypedefForVariablyModifiedType(S, NewTD); 3916 3917 bool Redeclaration = D.isRedeclaration(); 3918 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3919 D.setRedeclaration(Redeclaration); 3920 return ND; 3921} 3922 3923void 3924Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3925 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3926 // then it shall have block scope. 3927 // Note that variably modified types must be fixed before merging the decl so 3928 // that redeclarations will match. 3929 QualType T = NewTD->getUnderlyingType(); 3930 if (T->isVariablyModifiedType()) { 3931 getCurFunction()->setHasBranchProtectedScope(); 3932 3933 if (S->getFnParent() == 0) { 3934 bool SizeIsNegative; 3935 llvm::APSInt Oversized; 3936 QualType FixedTy = 3937 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3938 Oversized); 3939 if (!FixedTy.isNull()) { 3940 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3941 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3942 } else { 3943 if (SizeIsNegative) 3944 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3945 else if (T->isVariableArrayType()) 3946 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3947 else if (Oversized.getBoolValue()) 3948 Diag(NewTD->getLocation(), diag::err_array_too_large) 3949 << Oversized.toString(10); 3950 else 3951 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3952 NewTD->setInvalidDecl(); 3953 } 3954 } 3955 } 3956} 3957 3958 3959/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3960/// declares a typedef-name, either using the 'typedef' type specifier or via 3961/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3962NamedDecl* 3963Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3964 LookupResult &Previous, bool &Redeclaration) { 3965 // Merge the decl with the existing one if appropriate. If the decl is 3966 // in an outer scope, it isn't the same thing. 3967 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3968 /*ExplicitInstantiationOrSpecialization=*/false); 3969 if (!Previous.empty()) { 3970 Redeclaration = true; 3971 MergeTypedefNameDecl(NewTD, Previous); 3972 } 3973 3974 // If this is the C FILE type, notify the AST context. 3975 if (IdentifierInfo *II = NewTD->getIdentifier()) 3976 if (!NewTD->isInvalidDecl() && 3977 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3978 if (II->isStr("FILE")) 3979 Context.setFILEDecl(NewTD); 3980 else if (II->isStr("jmp_buf")) 3981 Context.setjmp_bufDecl(NewTD); 3982 else if (II->isStr("sigjmp_buf")) 3983 Context.setsigjmp_bufDecl(NewTD); 3984 else if (II->isStr("ucontext_t")) 3985 Context.setucontext_tDecl(NewTD); 3986 } 3987 3988 return NewTD; 3989} 3990 3991/// \brief Determines whether the given declaration is an out-of-scope 3992/// previous declaration. 3993/// 3994/// This routine should be invoked when name lookup has found a 3995/// previous declaration (PrevDecl) that is not in the scope where a 3996/// new declaration by the same name is being introduced. If the new 3997/// declaration occurs in a local scope, previous declarations with 3998/// linkage may still be considered previous declarations (C99 3999/// 6.2.2p4-5, C++ [basic.link]p6). 4000/// 4001/// \param PrevDecl the previous declaration found by name 4002/// lookup 4003/// 4004/// \param DC the context in which the new declaration is being 4005/// declared. 4006/// 4007/// \returns true if PrevDecl is an out-of-scope previous declaration 4008/// for a new delcaration with the same name. 4009static bool 4010isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 4011 ASTContext &Context) { 4012 if (!PrevDecl) 4013 return false; 4014 4015 if (!PrevDecl->hasLinkage()) 4016 return false; 4017 4018 if (Context.getLangOpts().CPlusPlus) { 4019 // C++ [basic.link]p6: 4020 // If there is a visible declaration of an entity with linkage 4021 // having the same name and type, ignoring entities declared 4022 // outside the innermost enclosing namespace scope, the block 4023 // scope declaration declares that same entity and receives the 4024 // linkage of the previous declaration. 4025 DeclContext *OuterContext = DC->getRedeclContext(); 4026 if (!OuterContext->isFunctionOrMethod()) 4027 // This rule only applies to block-scope declarations. 4028 return false; 4029 4030 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 4031 if (PrevOuterContext->isRecord()) 4032 // We found a member function: ignore it. 4033 return false; 4034 4035 // Find the innermost enclosing namespace for the new and 4036 // previous declarations. 4037 OuterContext = OuterContext->getEnclosingNamespaceContext(); 4038 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 4039 4040 // The previous declaration is in a different namespace, so it 4041 // isn't the same function. 4042 if (!OuterContext->Equals(PrevOuterContext)) 4043 return false; 4044 } 4045 4046 return true; 4047} 4048 4049static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 4050 CXXScopeSpec &SS = D.getCXXScopeSpec(); 4051 if (!SS.isSet()) return; 4052 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 4053} 4054 4055bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 4056 QualType type = decl->getType(); 4057 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 4058 if (lifetime == Qualifiers::OCL_Autoreleasing) { 4059 // Various kinds of declaration aren't allowed to be __autoreleasing. 4060 unsigned kind = -1U; 4061 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 4062 if (var->hasAttr<BlocksAttr>()) 4063 kind = 0; // __block 4064 else if (!var->hasLocalStorage()) 4065 kind = 1; // global 4066 } else if (isa<ObjCIvarDecl>(decl)) { 4067 kind = 3; // ivar 4068 } else if (isa<FieldDecl>(decl)) { 4069 kind = 2; // field 4070 } 4071 4072 if (kind != -1U) { 4073 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 4074 << kind; 4075 } 4076 } else if (lifetime == Qualifiers::OCL_None) { 4077 // Try to infer lifetime. 4078 if (!type->isObjCLifetimeType()) 4079 return false; 4080 4081 lifetime = type->getObjCARCImplicitLifetime(); 4082 type = Context.getLifetimeQualifiedType(type, lifetime); 4083 decl->setType(type); 4084 } 4085 4086 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 4087 // Thread-local variables cannot have lifetime. 4088 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 4089 var->isThreadSpecified()) { 4090 Diag(var->getLocation(), diag::err_arc_thread_ownership) 4091 << var->getType(); 4092 return true; 4093 } 4094 } 4095 4096 return false; 4097} 4098 4099NamedDecl* 4100Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4101 TypeSourceInfo *TInfo, LookupResult &Previous, 4102 MultiTemplateParamsArg TemplateParamLists) { 4103 QualType R = TInfo->getType(); 4104 DeclarationName Name = GetNameForDeclarator(D).getName(); 4105 4106 // Check that there are no default arguments (C++ only). 4107 if (getLangOpts().CPlusPlus) 4108 CheckExtraCXXDefaultArguments(D); 4109 4110 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 4111 assert(SCSpec != DeclSpec::SCS_typedef && 4112 "Parser allowed 'typedef' as storage class VarDecl."); 4113 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 4114 if (SCSpec == DeclSpec::SCS_mutable) { 4115 // mutable can only appear on non-static class members, so it's always 4116 // an error here 4117 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 4118 D.setInvalidType(); 4119 SC = SC_None; 4120 } 4121 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4122 VarDecl::StorageClass SCAsWritten 4123 = StorageClassSpecToVarDeclStorageClass(SCSpec); 4124 4125 IdentifierInfo *II = Name.getAsIdentifierInfo(); 4126 if (!II) { 4127 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 4128 << Name; 4129 return 0; 4130 } 4131 4132 DiagnoseFunctionSpecifiers(D); 4133 4134 if (!DC->isRecord() && S->getFnParent() == 0) { 4135 // C99 6.9p2: The storage-class specifiers auto and register shall not 4136 // appear in the declaration specifiers in an external declaration. 4137 if (SC == SC_Auto || SC == SC_Register) { 4138 4139 // If this is a register variable with an asm label specified, then this 4140 // is a GNU extension. 4141 if (SC == SC_Register && D.getAsmLabel()) 4142 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 4143 else 4144 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 4145 D.setInvalidType(); 4146 } 4147 } 4148 4149 if (getLangOpts().OpenCL) { 4150 // Set up the special work-group-local storage class for variables in the 4151 // OpenCL __local address space. 4152 if (R.getAddressSpace() == LangAS::opencl_local) 4153 SC = SC_OpenCLWorkGroupLocal; 4154 } 4155 4156 bool isExplicitSpecialization = false; 4157 VarDecl *NewVD; 4158 if (!getLangOpts().CPlusPlus) { 4159 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4160 D.getIdentifierLoc(), II, 4161 R, TInfo, SC, SCAsWritten); 4162 4163 if (D.isInvalidType()) 4164 NewVD->setInvalidDecl(); 4165 } else { 4166 if (DC->isRecord() && !CurContext->isRecord()) { 4167 // This is an out-of-line definition of a static data member. 4168 if (SC == SC_Static) { 4169 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4170 diag::err_static_out_of_line) 4171 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4172 } else if (SC == SC_None) 4173 SC = SC_Static; 4174 } 4175 if (SC == SC_Static && CurContext->isRecord()) { 4176 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 4177 if (RD->isLocalClass()) 4178 Diag(D.getIdentifierLoc(), 4179 diag::err_static_data_member_not_allowed_in_local_class) 4180 << Name << RD->getDeclName(); 4181 4182 // C++98 [class.union]p1: If a union contains a static data member, 4183 // the program is ill-formed. C++11 drops this restriction. 4184 if (RD->isUnion()) 4185 Diag(D.getIdentifierLoc(), 4186 getLangOpts().CPlusPlus0x 4187 ? diag::warn_cxx98_compat_static_data_member_in_union 4188 : diag::ext_static_data_member_in_union) << Name; 4189 // We conservatively disallow static data members in anonymous structs. 4190 else if (!RD->getDeclName()) 4191 Diag(D.getIdentifierLoc(), 4192 diag::err_static_data_member_not_allowed_in_anon_struct) 4193 << Name << RD->isUnion(); 4194 } 4195 } 4196 4197 // Match up the template parameter lists with the scope specifier, then 4198 // determine whether we have a template or a template specialization. 4199 isExplicitSpecialization = false; 4200 bool Invalid = false; 4201 if (TemplateParameterList *TemplateParams 4202 = MatchTemplateParametersToScopeSpecifier( 4203 D.getDeclSpec().getLocStart(), 4204 D.getIdentifierLoc(), 4205 D.getCXXScopeSpec(), 4206 TemplateParamLists.get(), 4207 TemplateParamLists.size(), 4208 /*never a friend*/ false, 4209 isExplicitSpecialization, 4210 Invalid)) { 4211 if (TemplateParams->size() > 0) { 4212 // There is no such thing as a variable template. 4213 Diag(D.getIdentifierLoc(), diag::err_template_variable) 4214 << II 4215 << SourceRange(TemplateParams->getTemplateLoc(), 4216 TemplateParams->getRAngleLoc()); 4217 return 0; 4218 } else { 4219 // There is an extraneous 'template<>' for this variable. Complain 4220 // about it, but allow the declaration of the variable. 4221 Diag(TemplateParams->getTemplateLoc(), 4222 diag::err_template_variable_noparams) 4223 << II 4224 << SourceRange(TemplateParams->getTemplateLoc(), 4225 TemplateParams->getRAngleLoc()); 4226 } 4227 } 4228 4229 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4230 D.getIdentifierLoc(), II, 4231 R, TInfo, SC, SCAsWritten); 4232 4233 // If this decl has an auto type in need of deduction, make a note of the 4234 // Decl so we can diagnose uses of it in its own initializer. 4235 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 4236 R->getContainedAutoType()) 4237 ParsingInitForAutoVars.insert(NewVD); 4238 4239 if (D.isInvalidType() || Invalid) 4240 NewVD->setInvalidDecl(); 4241 4242 SetNestedNameSpecifier(NewVD, D); 4243 4244 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 4245 NewVD->setTemplateParameterListsInfo(Context, 4246 TemplateParamLists.size(), 4247 TemplateParamLists.release()); 4248 } 4249 4250 if (D.getDeclSpec().isConstexprSpecified()) 4251 NewVD->setConstexpr(true); 4252 } 4253 4254 // Set the lexical context. If the declarator has a C++ scope specifier, the 4255 // lexical context will be different from the semantic context. 4256 NewVD->setLexicalDeclContext(CurContext); 4257 4258 if (D.getDeclSpec().isThreadSpecified()) { 4259 if (NewVD->hasLocalStorage()) 4260 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4261 else if (!Context.getTargetInfo().isTLSSupported()) 4262 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4263 else 4264 NewVD->setThreadSpecified(true); 4265 } 4266 4267 if (D.getDeclSpec().isModulePrivateSpecified()) { 4268 if (isExplicitSpecialization) 4269 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4270 << 2 4271 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4272 else if (NewVD->hasLocalStorage()) 4273 Diag(NewVD->getLocation(), diag::err_module_private_local) 4274 << 0 << NewVD->getDeclName() 4275 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4276 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4277 else 4278 NewVD->setModulePrivate(); 4279 } 4280 4281 // Handle attributes prior to checking for duplicates in MergeVarDecl 4282 ProcessDeclAttributes(S, NewVD, D); 4283 4284 // In auto-retain/release, infer strong retension for variables of 4285 // retainable type. 4286 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4287 NewVD->setInvalidDecl(); 4288 4289 // Handle GNU asm-label extension (encoded as an attribute). 4290 if (Expr *E = (Expr*)D.getAsmLabel()) { 4291 // The parser guarantees this is a string. 4292 StringLiteral *SE = cast<StringLiteral>(E); 4293 StringRef Label = SE->getString(); 4294 if (S->getFnParent() != 0) { 4295 switch (SC) { 4296 case SC_None: 4297 case SC_Auto: 4298 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4299 break; 4300 case SC_Register: 4301 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4302 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4303 break; 4304 case SC_Static: 4305 case SC_Extern: 4306 case SC_PrivateExtern: 4307 case SC_OpenCLWorkGroupLocal: 4308 break; 4309 } 4310 } 4311 4312 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4313 Context, Label)); 4314 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 4315 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 4316 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier()); 4317 if (I != ExtnameUndeclaredIdentifiers.end()) { 4318 NewVD->addAttr(I->second); 4319 ExtnameUndeclaredIdentifiers.erase(I); 4320 } 4321 } 4322 4323 // Diagnose shadowed variables before filtering for scope. 4324 if (!D.getCXXScopeSpec().isSet()) 4325 CheckShadow(S, NewVD, Previous); 4326 4327 // Don't consider existing declarations that are in a different 4328 // scope and are out-of-semantic-context declarations (if the new 4329 // declaration has linkage). 4330 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4331 isExplicitSpecialization); 4332 4333 if (!getLangOpts().CPlusPlus) { 4334 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4335 } else { 4336 // Merge the decl with the existing one if appropriate. 4337 if (!Previous.empty()) { 4338 if (Previous.isSingleResult() && 4339 isa<FieldDecl>(Previous.getFoundDecl()) && 4340 D.getCXXScopeSpec().isSet()) { 4341 // The user tried to define a non-static data member 4342 // out-of-line (C++ [dcl.meaning]p1). 4343 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4344 << D.getCXXScopeSpec().getRange(); 4345 Previous.clear(); 4346 NewVD->setInvalidDecl(); 4347 } 4348 } else if (D.getCXXScopeSpec().isSet()) { 4349 // No previous declaration in the qualifying scope. 4350 Diag(D.getIdentifierLoc(), diag::err_no_member) 4351 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4352 << D.getCXXScopeSpec().getRange(); 4353 NewVD->setInvalidDecl(); 4354 } 4355 4356 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4357 4358 // This is an explicit specialization of a static data member. Check it. 4359 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4360 CheckMemberSpecialization(NewVD, Previous)) 4361 NewVD->setInvalidDecl(); 4362 } 4363 4364 // If this is a locally-scoped extern C variable, update the map of 4365 // such variables. 4366 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4367 !NewVD->isInvalidDecl()) 4368 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4369 4370 // If there's a #pragma GCC visibility in scope, and this isn't a class 4371 // member, set the visibility of this variable. 4372 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4373 AddPushedVisibilityAttribute(NewVD); 4374 4375 MarkUnusedFileScopedDecl(NewVD); 4376 4377 return NewVD; 4378} 4379 4380/// \brief Diagnose variable or built-in function shadowing. Implements 4381/// -Wshadow. 4382/// 4383/// This method is called whenever a VarDecl is added to a "useful" 4384/// scope. 4385/// 4386/// \param S the scope in which the shadowing name is being declared 4387/// \param R the lookup of the name 4388/// 4389void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4390 // Return if warning is ignored. 4391 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4392 DiagnosticsEngine::Ignored) 4393 return; 4394 4395 // Don't diagnose declarations at file scope. 4396 if (D->hasGlobalStorage()) 4397 return; 4398 4399 DeclContext *NewDC = D->getDeclContext(); 4400 4401 // Only diagnose if we're shadowing an unambiguous field or variable. 4402 if (R.getResultKind() != LookupResult::Found) 4403 return; 4404 4405 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4406 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4407 return; 4408 4409 // Fields are not shadowed by variables in C++ static methods. 4410 if (isa<FieldDecl>(ShadowedDecl)) 4411 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4412 if (MD->isStatic()) 4413 return; 4414 4415 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4416 if (shadowedVar->isExternC()) { 4417 // For shadowing external vars, make sure that we point to the global 4418 // declaration, not a locally scoped extern declaration. 4419 for (VarDecl::redecl_iterator 4420 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4421 I != E; ++I) 4422 if (I->isFileVarDecl()) { 4423 ShadowedDecl = *I; 4424 break; 4425 } 4426 } 4427 4428 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4429 4430 // Only warn about certain kinds of shadowing for class members. 4431 if (NewDC && NewDC->isRecord()) { 4432 // In particular, don't warn about shadowing non-class members. 4433 if (!OldDC->isRecord()) 4434 return; 4435 4436 // TODO: should we warn about static data members shadowing 4437 // static data members from base classes? 4438 4439 // TODO: don't diagnose for inaccessible shadowed members. 4440 // This is hard to do perfectly because we might friend the 4441 // shadowing context, but that's just a false negative. 4442 } 4443 4444 // Determine what kind of declaration we're shadowing. 4445 unsigned Kind; 4446 if (isa<RecordDecl>(OldDC)) { 4447 if (isa<FieldDecl>(ShadowedDecl)) 4448 Kind = 3; // field 4449 else 4450 Kind = 2; // static data member 4451 } else if (OldDC->isFileContext()) 4452 Kind = 1; // global 4453 else 4454 Kind = 0; // local 4455 4456 DeclarationName Name = R.getLookupName(); 4457 4458 // Emit warning and note. 4459 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4460 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4461} 4462 4463/// \brief Check -Wshadow without the advantage of a previous lookup. 4464void Sema::CheckShadow(Scope *S, VarDecl *D) { 4465 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4466 DiagnosticsEngine::Ignored) 4467 return; 4468 4469 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4470 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4471 LookupName(R, S); 4472 CheckShadow(S, D, R); 4473} 4474 4475/// \brief Perform semantic checking on a newly-created variable 4476/// declaration. 4477/// 4478/// This routine performs all of the type-checking required for a 4479/// variable declaration once it has been built. It is used both to 4480/// check variables after they have been parsed and their declarators 4481/// have been translated into a declaration, and to check variables 4482/// that have been instantiated from a template. 4483/// 4484/// Sets NewVD->isInvalidDecl() if an error was encountered. 4485/// 4486/// Returns true if the variable declaration is a redeclaration. 4487bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4488 LookupResult &Previous) { 4489 // If the decl is already known invalid, don't check it. 4490 if (NewVD->isInvalidDecl()) 4491 return false; 4492 4493 QualType T = NewVD->getType(); 4494 4495 if (T->isObjCObjectType()) { 4496 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4497 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4498 T = Context.getObjCObjectPointerType(T); 4499 NewVD->setType(T); 4500 } 4501 4502 // Emit an error if an address space was applied to decl with local storage. 4503 // This includes arrays of objects with address space qualifiers, but not 4504 // automatic variables that point to other address spaces. 4505 // ISO/IEC TR 18037 S5.1.2 4506 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4507 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4508 NewVD->setInvalidDecl(); 4509 return false; 4510 } 4511 4512 // OpenCL v1.2 s6.8 -- The static qualifier is valid only in program 4513 // scope. 4514 if ((getLangOpts().OpenCLVersion >= 120) 4515 && NewVD->isStaticLocal()) { 4516 Diag(NewVD->getLocation(), diag::err_static_function_scope); 4517 NewVD->setInvalidDecl(); 4518 return false; 4519 } 4520 4521 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4522 && !NewVD->hasAttr<BlocksAttr>()) { 4523 if (getLangOpts().getGC() != LangOptions::NonGC) 4524 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4525 else 4526 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4527 } 4528 4529 bool isVM = T->isVariablyModifiedType(); 4530 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4531 NewVD->hasAttr<BlocksAttr>()) 4532 getCurFunction()->setHasBranchProtectedScope(); 4533 4534 if ((isVM && NewVD->hasLinkage()) || 4535 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4536 bool SizeIsNegative; 4537 llvm::APSInt Oversized; 4538 QualType FixedTy = 4539 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4540 Oversized); 4541 4542 if (FixedTy.isNull() && T->isVariableArrayType()) { 4543 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4544 // FIXME: This won't give the correct result for 4545 // int a[10][n]; 4546 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4547 4548 if (NewVD->isFileVarDecl()) 4549 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4550 << SizeRange; 4551 else if (NewVD->getStorageClass() == SC_Static) 4552 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4553 << SizeRange; 4554 else 4555 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4556 << SizeRange; 4557 NewVD->setInvalidDecl(); 4558 return false; 4559 } 4560 4561 if (FixedTy.isNull()) { 4562 if (NewVD->isFileVarDecl()) 4563 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4564 else 4565 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4566 NewVD->setInvalidDecl(); 4567 return false; 4568 } 4569 4570 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4571 NewVD->setType(FixedTy); 4572 } 4573 4574 if (Previous.empty() && NewVD->isExternC()) { 4575 // Since we did not find anything by this name and we're declaring 4576 // an extern "C" variable, look for a non-visible extern "C" 4577 // declaration with the same name. 4578 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4579 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4580 if (Pos != LocallyScopedExternalDecls.end()) 4581 Previous.addDecl(Pos->second); 4582 } 4583 4584 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4585 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4586 << T; 4587 NewVD->setInvalidDecl(); 4588 return false; 4589 } 4590 4591 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4592 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4593 NewVD->setInvalidDecl(); 4594 return false; 4595 } 4596 4597 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4598 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4599 NewVD->setInvalidDecl(); 4600 return false; 4601 } 4602 4603 if (NewVD->isConstexpr() && !T->isDependentType() && 4604 RequireLiteralType(NewVD->getLocation(), T, 4605 diag::err_constexpr_var_non_literal)) { 4606 NewVD->setInvalidDecl(); 4607 return false; 4608 } 4609 4610 if (!Previous.empty()) { 4611 MergeVarDecl(NewVD, Previous); 4612 return true; 4613 } 4614 return false; 4615} 4616 4617/// \brief Data used with FindOverriddenMethod 4618struct FindOverriddenMethodData { 4619 Sema *S; 4620 CXXMethodDecl *Method; 4621}; 4622 4623/// \brief Member lookup function that determines whether a given C++ 4624/// method overrides a method in a base class, to be used with 4625/// CXXRecordDecl::lookupInBases(). 4626static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4627 CXXBasePath &Path, 4628 void *UserData) { 4629 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4630 4631 FindOverriddenMethodData *Data 4632 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4633 4634 DeclarationName Name = Data->Method->getDeclName(); 4635 4636 // FIXME: Do we care about other names here too? 4637 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4638 // We really want to find the base class destructor here. 4639 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4640 CanQualType CT = Data->S->Context.getCanonicalType(T); 4641 4642 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4643 } 4644 4645 for (Path.Decls = BaseRecord->lookup(Name); 4646 Path.Decls.first != Path.Decls.second; 4647 ++Path.Decls.first) { 4648 NamedDecl *D = *Path.Decls.first; 4649 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4650 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4651 return true; 4652 } 4653 } 4654 4655 return false; 4656} 4657 4658/// AddOverriddenMethods - See if a method overrides any in the base classes, 4659/// and if so, check that it's a valid override and remember it. 4660bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4661 // Look for virtual methods in base classes that this method might override. 4662 CXXBasePaths Paths; 4663 FindOverriddenMethodData Data; 4664 Data.Method = MD; 4665 Data.S = this; 4666 bool AddedAny = false; 4667 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4668 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4669 E = Paths.found_decls_end(); I != E; ++I) { 4670 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4671 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4672 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4673 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4674 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4675 AddedAny = true; 4676 } 4677 } 4678 } 4679 } 4680 4681 return AddedAny; 4682} 4683 4684namespace { 4685 // Struct for holding all of the extra arguments needed by 4686 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4687 struct ActOnFDArgs { 4688 Scope *S; 4689 Declarator &D; 4690 MultiTemplateParamsArg TemplateParamLists; 4691 bool AddToScope; 4692 }; 4693} 4694 4695namespace { 4696 4697// Callback to only accept typo corrections that have a non-zero edit distance. 4698// Also only accept corrections that have the same parent decl. 4699class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4700 public: 4701 DifferentNameValidatorCCC(ASTContext &Context, FunctionDecl *TypoFD, 4702 CXXRecordDecl *Parent) 4703 : Context(Context), OriginalFD(TypoFD), 4704 ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {} 4705 4706 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4707 if (candidate.getEditDistance() == 0) 4708 return false; 4709 4710 llvm::SmallVector<unsigned, 1> MismatchedParams; 4711 for (TypoCorrection::const_decl_iterator CDecl = candidate.begin(), 4712 CDeclEnd = candidate.end(); 4713 CDecl != CDeclEnd; ++CDecl) { 4714 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4715 4716 if (FD && !FD->hasBody() && 4717 hasSimilarParameters(Context, FD, OriginalFD, MismatchedParams)) { 4718 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 4719 CXXRecordDecl *Parent = MD->getParent(); 4720 if (Parent && Parent->getCanonicalDecl() == ExpectedParent) 4721 return true; 4722 } else if (!ExpectedParent) { 4723 return true; 4724 } 4725 } 4726 } 4727 4728 return false; 4729 } 4730 4731 private: 4732 ASTContext &Context; 4733 FunctionDecl *OriginalFD; 4734 CXXRecordDecl *ExpectedParent; 4735}; 4736 4737} 4738 4739/// \brief Generate diagnostics for an invalid function redeclaration. 4740/// 4741/// This routine handles generating the diagnostic messages for an invalid 4742/// function redeclaration, including finding possible similar declarations 4743/// or performing typo correction if there are no previous declarations with 4744/// the same name. 4745/// 4746/// Returns a NamedDecl iff typo correction was performed and substituting in 4747/// the new declaration name does not cause new errors. 4748static NamedDecl* DiagnoseInvalidRedeclaration( 4749 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4750 ActOnFDArgs &ExtraArgs) { 4751 NamedDecl *Result = NULL; 4752 DeclarationName Name = NewFD->getDeclName(); 4753 DeclContext *NewDC = NewFD->getDeclContext(); 4754 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4755 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4756 llvm::SmallVector<unsigned, 1> MismatchedParams; 4757 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4758 TypoCorrection Correction; 4759 bool isFriendDecl = (SemaRef.getLangOpts().CPlusPlus && 4760 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4761 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4762 : diag::err_member_def_does_not_match; 4763 4764 NewFD->setInvalidDecl(); 4765 SemaRef.LookupQualifiedName(Prev, NewDC); 4766 assert(!Prev.isAmbiguous() && 4767 "Cannot have an ambiguity in previous-declaration lookup"); 4768 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 4769 DifferentNameValidatorCCC Validator(SemaRef.Context, NewFD, 4770 MD ? MD->getParent() : 0); 4771 if (!Prev.empty()) { 4772 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4773 Func != FuncEnd; ++Func) { 4774 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4775 if (FD && 4776 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4777 // Add 1 to the index so that 0 can mean the mismatch didn't 4778 // involve a parameter 4779 unsigned ParamNum = 4780 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4781 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4782 } 4783 } 4784 // If the qualified name lookup yielded nothing, try typo correction 4785 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4786 Prev.getLookupKind(), 0, 0, 4787 Validator, NewDC))) { 4788 // Trap errors. 4789 Sema::SFINAETrap Trap(SemaRef); 4790 4791 // Set up everything for the call to ActOnFunctionDeclarator 4792 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4793 ExtraArgs.D.getIdentifierLoc()); 4794 Previous.clear(); 4795 Previous.setLookupName(Correction.getCorrection()); 4796 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4797 CDeclEnd = Correction.end(); 4798 CDecl != CDeclEnd; ++CDecl) { 4799 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4800 if (FD && !FD->hasBody() && 4801 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4802 Previous.addDecl(FD); 4803 } 4804 } 4805 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4806 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4807 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4808 // eliminate the need for the parameter pack ExtraArgs. 4809 Result = SemaRef.ActOnFunctionDeclarator( 4810 ExtraArgs.S, ExtraArgs.D, 4811 Correction.getCorrectionDecl()->getDeclContext(), 4812 NewFD->getTypeSourceInfo(), Previous, ExtraArgs.TemplateParamLists, 4813 ExtraArgs.AddToScope); 4814 if (Trap.hasErrorOccurred()) { 4815 // Pretend the typo correction never occurred 4816 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4817 ExtraArgs.D.getIdentifierLoc()); 4818 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4819 Previous.clear(); 4820 Previous.setLookupName(Name); 4821 Result = NULL; 4822 } else { 4823 for (LookupResult::iterator Func = Previous.begin(), 4824 FuncEnd = Previous.end(); 4825 Func != FuncEnd; ++Func) { 4826 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4827 NearMatches.push_back(std::make_pair(FD, 0)); 4828 } 4829 } 4830 if (NearMatches.empty()) { 4831 // Ignore the correction if it didn't yield any close FunctionDecl matches 4832 Correction = TypoCorrection(); 4833 } else { 4834 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4835 : diag::err_member_def_does_not_match_suggest; 4836 } 4837 } 4838 4839 if (Correction) { 4840 SourceRange FixItLoc(NewFD->getLocation()); 4841 CXXScopeSpec &SS = ExtraArgs.D.getCXXScopeSpec(); 4842 if (Correction.getCorrectionSpecifier() && SS.isValid()) 4843 FixItLoc.setBegin(SS.getBeginLoc()); 4844 SemaRef.Diag(NewFD->getLocStart(), DiagMsg) 4845 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOpts()) 4846 << FixItHint::CreateReplacement( 4847 FixItLoc, Correction.getAsString(SemaRef.getLangOpts())); 4848 } else { 4849 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4850 << Name << NewDC << NewFD->getLocation(); 4851 } 4852 4853 bool NewFDisConst = false; 4854 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4855 NewFDisConst = NewMD->isConst(); 4856 4857 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4858 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4859 NearMatch != NearMatchEnd; ++NearMatch) { 4860 FunctionDecl *FD = NearMatch->first; 4861 bool FDisConst = false; 4862 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4863 FDisConst = MD->isConst(); 4864 4865 if (unsigned Idx = NearMatch->second) { 4866 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4867 SourceLocation Loc = FDParam->getTypeSpecStartLoc(); 4868 if (Loc.isInvalid()) Loc = FD->getLocation(); 4869 SemaRef.Diag(Loc, diag::note_member_def_close_param_match) 4870 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4871 } else if (Correction) { 4872 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4873 << Correction.getQuoted(SemaRef.getLangOpts()); 4874 } else if (FDisConst != NewFDisConst) { 4875 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4876 << NewFDisConst << FD->getSourceRange().getEnd(); 4877 } else 4878 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4879 } 4880 return Result; 4881} 4882 4883static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4884 Declarator &D) { 4885 switch (D.getDeclSpec().getStorageClassSpec()) { 4886 default: llvm_unreachable("Unknown storage class!"); 4887 case DeclSpec::SCS_auto: 4888 case DeclSpec::SCS_register: 4889 case DeclSpec::SCS_mutable: 4890 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4891 diag::err_typecheck_sclass_func); 4892 D.setInvalidType(); 4893 break; 4894 case DeclSpec::SCS_unspecified: break; 4895 case DeclSpec::SCS_extern: return SC_Extern; 4896 case DeclSpec::SCS_static: { 4897 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4898 // C99 6.7.1p5: 4899 // The declaration of an identifier for a function that has 4900 // block scope shall have no explicit storage-class specifier 4901 // other than extern 4902 // See also (C++ [dcl.stc]p4). 4903 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4904 diag::err_static_block_func); 4905 break; 4906 } else 4907 return SC_Static; 4908 } 4909 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4910 } 4911 4912 // No explicit storage class has already been returned 4913 return SC_None; 4914} 4915 4916static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4917 DeclContext *DC, QualType &R, 4918 TypeSourceInfo *TInfo, 4919 FunctionDecl::StorageClass SC, 4920 bool &IsVirtualOkay) { 4921 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4922 DeclarationName Name = NameInfo.getName(); 4923 4924 FunctionDecl *NewFD = 0; 4925 bool isInline = D.getDeclSpec().isInlineSpecified(); 4926 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4927 FunctionDecl::StorageClass SCAsWritten 4928 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4929 4930 if (!SemaRef.getLangOpts().CPlusPlus) { 4931 // Determine whether the function was written with a 4932 // prototype. This true when: 4933 // - there is a prototype in the declarator, or 4934 // - the type R of the function is some kind of typedef or other reference 4935 // to a type name (which eventually refers to a function type). 4936 bool HasPrototype = 4937 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4938 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4939 4940 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4941 D.getLocStart(), NameInfo, R, 4942 TInfo, SC, SCAsWritten, isInline, 4943 HasPrototype); 4944 if (D.isInvalidType()) 4945 NewFD->setInvalidDecl(); 4946 4947 // Set the lexical context. 4948 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4949 4950 return NewFD; 4951 } 4952 4953 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4954 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4955 4956 // Check that the return type is not an abstract class type. 4957 // For record types, this is done by the AbstractClassUsageDiagnoser once 4958 // the class has been completely parsed. 4959 if (!DC->isRecord() && 4960 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4961 R->getAs<FunctionType>()->getResultType(), 4962 diag::err_abstract_type_in_decl, 4963 SemaRef.AbstractReturnType)) 4964 D.setInvalidType(); 4965 4966 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4967 // This is a C++ constructor declaration. 4968 assert(DC->isRecord() && 4969 "Constructors can only be declared in a member context"); 4970 4971 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4972 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4973 D.getLocStart(), NameInfo, 4974 R, TInfo, isExplicit, isInline, 4975 /*isImplicitlyDeclared=*/false, 4976 isConstexpr); 4977 4978 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4979 // This is a C++ destructor declaration. 4980 if (DC->isRecord()) { 4981 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4982 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4983 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4984 SemaRef.Context, Record, 4985 D.getLocStart(), 4986 NameInfo, R, TInfo, isInline, 4987 /*isImplicitlyDeclared=*/false); 4988 4989 // If the class is complete, then we now create the implicit exception 4990 // specification. If the class is incomplete or dependent, we can't do 4991 // it yet. 4992 if (SemaRef.getLangOpts().CPlusPlus0x && !Record->isDependentType() && 4993 Record->getDefinition() && !Record->isBeingDefined() && 4994 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4995 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4996 } 4997 4998 IsVirtualOkay = true; 4999 return NewDD; 5000 5001 } else { 5002 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 5003 D.setInvalidType(); 5004 5005 // Create a FunctionDecl to satisfy the function definition parsing 5006 // code path. 5007 return FunctionDecl::Create(SemaRef.Context, DC, 5008 D.getLocStart(), 5009 D.getIdentifierLoc(), Name, R, TInfo, 5010 SC, SCAsWritten, isInline, 5011 /*hasPrototype=*/true, isConstexpr); 5012 } 5013 5014 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 5015 if (!DC->isRecord()) { 5016 SemaRef.Diag(D.getIdentifierLoc(), 5017 diag::err_conv_function_not_member); 5018 return 0; 5019 } 5020 5021 SemaRef.CheckConversionDeclarator(D, R, SC); 5022 IsVirtualOkay = true; 5023 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 5024 D.getLocStart(), NameInfo, 5025 R, TInfo, isInline, isExplicit, 5026 isConstexpr, SourceLocation()); 5027 5028 } else if (DC->isRecord()) { 5029 // If the name of the function is the same as the name of the record, 5030 // then this must be an invalid constructor that has a return type. 5031 // (The parser checks for a return type and makes the declarator a 5032 // constructor if it has no return type). 5033 if (Name.getAsIdentifierInfo() && 5034 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 5035 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 5036 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5037 << SourceRange(D.getIdentifierLoc()); 5038 return 0; 5039 } 5040 5041 bool isStatic = SC == SC_Static; 5042 5043 // [class.free]p1: 5044 // Any allocation function for a class T is a static member 5045 // (even if not explicitly declared static). 5046 if (Name.getCXXOverloadedOperator() == OO_New || 5047 Name.getCXXOverloadedOperator() == OO_Array_New) 5048 isStatic = true; 5049 5050 // [class.free]p6 Any deallocation function for a class X is a static member 5051 // (even if not explicitly declared static). 5052 if (Name.getCXXOverloadedOperator() == OO_Delete || 5053 Name.getCXXOverloadedOperator() == OO_Array_Delete) 5054 isStatic = true; 5055 5056 IsVirtualOkay = !isStatic; 5057 5058 // This is a C++ method declaration. 5059 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 5060 D.getLocStart(), NameInfo, R, 5061 TInfo, isStatic, SCAsWritten, isInline, 5062 isConstexpr, SourceLocation()); 5063 5064 } else { 5065 // Determine whether the function was written with a 5066 // prototype. This true when: 5067 // - we're in C++ (where every function has a prototype), 5068 return FunctionDecl::Create(SemaRef.Context, DC, 5069 D.getLocStart(), 5070 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 5071 true/*HasPrototype*/, isConstexpr); 5072 } 5073} 5074 5075NamedDecl* 5076Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 5077 TypeSourceInfo *TInfo, LookupResult &Previous, 5078 MultiTemplateParamsArg TemplateParamLists, 5079 bool &AddToScope) { 5080 QualType R = TInfo->getType(); 5081 5082 assert(R.getTypePtr()->isFunctionType()); 5083 5084 // TODO: consider using NameInfo for diagnostic. 5085 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 5086 DeclarationName Name = NameInfo.getName(); 5087 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 5088 5089 if (D.getDeclSpec().isThreadSpecified()) 5090 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5091 5092 // Do not allow returning a objc interface by-value. 5093 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 5094 Diag(D.getIdentifierLoc(), 5095 diag::err_object_cannot_be_passed_returned_by_value) << 0 5096 << R->getAs<FunctionType>()->getResultType() 5097 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 5098 5099 QualType T = R->getAs<FunctionType>()->getResultType(); 5100 T = Context.getObjCObjectPointerType(T); 5101 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 5102 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 5103 R = Context.getFunctionType(T, FPT->arg_type_begin(), 5104 FPT->getNumArgs(), EPI); 5105 } 5106 else if (isa<FunctionNoProtoType>(R)) 5107 R = Context.getFunctionNoProtoType(T); 5108 } 5109 5110 bool isFriend = false; 5111 FunctionTemplateDecl *FunctionTemplate = 0; 5112 bool isExplicitSpecialization = false; 5113 bool isFunctionTemplateSpecialization = false; 5114 5115 bool isDependentClassScopeExplicitSpecialization = false; 5116 bool HasExplicitTemplateArgs = false; 5117 TemplateArgumentListInfo TemplateArgs; 5118 5119 bool isVirtualOkay = false; 5120 5121 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 5122 isVirtualOkay); 5123 if (!NewFD) return 0; 5124 5125 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 5126 NewFD->setTopLevelDeclInObjCContainer(); 5127 5128 if (getLangOpts().CPlusPlus) { 5129 bool isInline = D.getDeclSpec().isInlineSpecified(); 5130 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5131 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 5132 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 5133 isFriend = D.getDeclSpec().isFriendSpecified(); 5134 if (isFriend && !isInline && D.isFunctionDefinition()) { 5135 // C++ [class.friend]p5 5136 // A function can be defined in a friend declaration of a 5137 // class . . . . Such a function is implicitly inline. 5138 NewFD->setImplicitlyInline(); 5139 } 5140 5141 SetNestedNameSpecifier(NewFD, D); 5142 isExplicitSpecialization = false; 5143 isFunctionTemplateSpecialization = false; 5144 if (D.isInvalidType()) 5145 NewFD->setInvalidDecl(); 5146 5147 // Set the lexical context. If the declarator has a C++ 5148 // scope specifier, or is the object of a friend declaration, the 5149 // lexical context will be different from the semantic context. 5150 NewFD->setLexicalDeclContext(CurContext); 5151 5152 // Match up the template parameter lists with the scope specifier, then 5153 // determine whether we have a template or a template specialization. 5154 bool Invalid = false; 5155 if (TemplateParameterList *TemplateParams 5156 = MatchTemplateParametersToScopeSpecifier( 5157 D.getDeclSpec().getLocStart(), 5158 D.getIdentifierLoc(), 5159 D.getCXXScopeSpec(), 5160 TemplateParamLists.get(), 5161 TemplateParamLists.size(), 5162 isFriend, 5163 isExplicitSpecialization, 5164 Invalid)) { 5165 if (TemplateParams->size() > 0) { 5166 // This is a function template 5167 5168 // Check that we can declare a template here. 5169 if (CheckTemplateDeclScope(S, TemplateParams)) 5170 return 0; 5171 5172 // A destructor cannot be a template. 5173 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 5174 Diag(NewFD->getLocation(), diag::err_destructor_template); 5175 return 0; 5176 } 5177 5178 // If we're adding a template to a dependent context, we may need to 5179 // rebuilding some of the types used within the template parameter list, 5180 // now that we know what the current instantiation is. 5181 if (DC->isDependentContext()) { 5182 ContextRAII SavedContext(*this, DC); 5183 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 5184 Invalid = true; 5185 } 5186 5187 5188 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 5189 NewFD->getLocation(), 5190 Name, TemplateParams, 5191 NewFD); 5192 FunctionTemplate->setLexicalDeclContext(CurContext); 5193 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 5194 5195 // For source fidelity, store the other template param lists. 5196 if (TemplateParamLists.size() > 1) { 5197 NewFD->setTemplateParameterListsInfo(Context, 5198 TemplateParamLists.size() - 1, 5199 TemplateParamLists.release()); 5200 } 5201 } else { 5202 // This is a function template specialization. 5203 isFunctionTemplateSpecialization = true; 5204 // For source fidelity, store all the template param lists. 5205 NewFD->setTemplateParameterListsInfo(Context, 5206 TemplateParamLists.size(), 5207 TemplateParamLists.release()); 5208 5209 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 5210 if (isFriend) { 5211 // We want to remove the "template<>", found here. 5212 SourceRange RemoveRange = TemplateParams->getSourceRange(); 5213 5214 // If we remove the template<> and the name is not a 5215 // template-id, we're actually silently creating a problem: 5216 // the friend declaration will refer to an untemplated decl, 5217 // and clearly the user wants a template specialization. So 5218 // we need to insert '<>' after the name. 5219 SourceLocation InsertLoc; 5220 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 5221 InsertLoc = D.getName().getSourceRange().getEnd(); 5222 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 5223 } 5224 5225 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 5226 << Name << RemoveRange 5227 << FixItHint::CreateRemoval(RemoveRange) 5228 << FixItHint::CreateInsertion(InsertLoc, "<>"); 5229 } 5230 } 5231 } 5232 else { 5233 // All template param lists were matched against the scope specifier: 5234 // this is NOT (an explicit specialization of) a template. 5235 if (TemplateParamLists.size() > 0) 5236 // For source fidelity, store all the template param lists. 5237 NewFD->setTemplateParameterListsInfo(Context, 5238 TemplateParamLists.size(), 5239 TemplateParamLists.release()); 5240 } 5241 5242 if (Invalid) { 5243 NewFD->setInvalidDecl(); 5244 if (FunctionTemplate) 5245 FunctionTemplate->setInvalidDecl(); 5246 } 5247 5248 // C++ [dcl.fct.spec]p5: 5249 // The virtual specifier shall only be used in declarations of 5250 // nonstatic class member functions that appear within a 5251 // member-specification of a class declaration; see 10.3. 5252 // 5253 if (isVirtual && !NewFD->isInvalidDecl()) { 5254 if (!isVirtualOkay) { 5255 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5256 diag::err_virtual_non_function); 5257 } else if (!CurContext->isRecord()) { 5258 // 'virtual' was specified outside of the class. 5259 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5260 diag::err_virtual_out_of_class) 5261 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5262 } else if (NewFD->getDescribedFunctionTemplate()) { 5263 // C++ [temp.mem]p3: 5264 // A member function template shall not be virtual. 5265 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5266 diag::err_virtual_member_function_template) 5267 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5268 } else { 5269 // Okay: Add virtual to the method. 5270 NewFD->setVirtualAsWritten(true); 5271 } 5272 } 5273 5274 // C++ [dcl.fct.spec]p3: 5275 // The inline specifier shall not appear on a block scope function 5276 // declaration. 5277 if (isInline && !NewFD->isInvalidDecl()) { 5278 if (CurContext->isFunctionOrMethod()) { 5279 // 'inline' is not allowed on block scope function declaration. 5280 Diag(D.getDeclSpec().getInlineSpecLoc(), 5281 diag::err_inline_declaration_block_scope) << Name 5282 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5283 } 5284 } 5285 5286 // C++ [dcl.fct.spec]p6: 5287 // The explicit specifier shall be used only in the declaration of a 5288 // constructor or conversion function within its class definition; 5289 // see 12.3.1 and 12.3.2. 5290 if (isExplicit && !NewFD->isInvalidDecl()) { 5291 if (!CurContext->isRecord()) { 5292 // 'explicit' was specified outside of the class. 5293 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5294 diag::err_explicit_out_of_class) 5295 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5296 } else if (!isa<CXXConstructorDecl>(NewFD) && 5297 !isa<CXXConversionDecl>(NewFD)) { 5298 // 'explicit' was specified on a function that wasn't a constructor 5299 // or conversion function. 5300 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5301 diag::err_explicit_non_ctor_or_conv_function) 5302 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5303 } 5304 } 5305 5306 if (isConstexpr) { 5307 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5308 // are implicitly inline. 5309 NewFD->setImplicitlyInline(); 5310 5311 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5312 // be either constructors or to return a literal type. Therefore, 5313 // destructors cannot be declared constexpr. 5314 if (isa<CXXDestructorDecl>(NewFD)) 5315 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5316 } 5317 5318 // If __module_private__ was specified, mark the function accordingly. 5319 if (D.getDeclSpec().isModulePrivateSpecified()) { 5320 if (isFunctionTemplateSpecialization) { 5321 SourceLocation ModulePrivateLoc 5322 = D.getDeclSpec().getModulePrivateSpecLoc(); 5323 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5324 << 0 5325 << FixItHint::CreateRemoval(ModulePrivateLoc); 5326 } else { 5327 NewFD->setModulePrivate(); 5328 if (FunctionTemplate) 5329 FunctionTemplate->setModulePrivate(); 5330 } 5331 } 5332 5333 if (isFriend) { 5334 // For now, claim that the objects have no previous declaration. 5335 if (FunctionTemplate) { 5336 FunctionTemplate->setObjectOfFriendDecl(false); 5337 FunctionTemplate->setAccess(AS_public); 5338 } 5339 NewFD->setObjectOfFriendDecl(false); 5340 NewFD->setAccess(AS_public); 5341 } 5342 5343 // If a function is defined as defaulted or deleted, mark it as such now. 5344 switch (D.getFunctionDefinitionKind()) { 5345 case FDK_Declaration: 5346 case FDK_Definition: 5347 break; 5348 5349 case FDK_Defaulted: 5350 NewFD->setDefaulted(); 5351 break; 5352 5353 case FDK_Deleted: 5354 NewFD->setDeletedAsWritten(); 5355 break; 5356 } 5357 5358 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5359 D.isFunctionDefinition()) { 5360 // C++ [class.mfct]p2: 5361 // A member function may be defined (8.4) in its class definition, in 5362 // which case it is an inline member function (7.1.2) 5363 NewFD->setImplicitlyInline(); 5364 } 5365 5366 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5367 !CurContext->isRecord()) { 5368 // C++ [class.static]p1: 5369 // A data or function member of a class may be declared static 5370 // in a class definition, in which case it is a static member of 5371 // the class. 5372 5373 // Complain about the 'static' specifier if it's on an out-of-line 5374 // member function definition. 5375 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5376 diag::err_static_out_of_line) 5377 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5378 } 5379 } 5380 5381 // Filter out previous declarations that don't match the scope. 5382 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5383 isExplicitSpecialization || 5384 isFunctionTemplateSpecialization); 5385 5386 // Handle GNU asm-label extension (encoded as an attribute). 5387 if (Expr *E = (Expr*) D.getAsmLabel()) { 5388 // The parser guarantees this is a string. 5389 StringLiteral *SE = cast<StringLiteral>(E); 5390 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5391 SE->getString())); 5392 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 5393 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 5394 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); 5395 if (I != ExtnameUndeclaredIdentifiers.end()) { 5396 NewFD->addAttr(I->second); 5397 ExtnameUndeclaredIdentifiers.erase(I); 5398 } 5399 } 5400 5401 // Copy the parameter declarations from the declarator D to the function 5402 // declaration NewFD, if they are available. First scavenge them into Params. 5403 SmallVector<ParmVarDecl*, 16> Params; 5404 if (D.isFunctionDeclarator()) { 5405 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5406 5407 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5408 // function that takes no arguments, not a function that takes a 5409 // single void argument. 5410 // We let through "const void" here because Sema::GetTypeForDeclarator 5411 // already checks for that case. 5412 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5413 FTI.ArgInfo[0].Param && 5414 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5415 // Empty arg list, don't push any params. 5416 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5417 5418 // In C++, the empty parameter-type-list must be spelled "void"; a 5419 // typedef of void is not permitted. 5420 if (getLangOpts().CPlusPlus && 5421 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5422 bool IsTypeAlias = false; 5423 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5424 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5425 else if (const TemplateSpecializationType *TST = 5426 Param->getType()->getAs<TemplateSpecializationType>()) 5427 IsTypeAlias = TST->isTypeAlias(); 5428 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5429 << IsTypeAlias; 5430 } 5431 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5432 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5433 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5434 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5435 Param->setDeclContext(NewFD); 5436 Params.push_back(Param); 5437 5438 if (Param->isInvalidDecl()) 5439 NewFD->setInvalidDecl(); 5440 } 5441 } 5442 5443 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5444 // When we're declaring a function with a typedef, typeof, etc as in the 5445 // following example, we'll need to synthesize (unnamed) 5446 // parameters for use in the declaration. 5447 // 5448 // @code 5449 // typedef void fn(int); 5450 // fn f; 5451 // @endcode 5452 5453 // Synthesize a parameter for each argument type. 5454 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5455 AE = FT->arg_type_end(); AI != AE; ++AI) { 5456 ParmVarDecl *Param = 5457 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5458 Param->setScopeInfo(0, Params.size()); 5459 Params.push_back(Param); 5460 } 5461 } else { 5462 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5463 "Should not need args for typedef of non-prototype fn"); 5464 } 5465 5466 // Finally, we know we have the right number of parameters, install them. 5467 NewFD->setParams(Params); 5468 5469 // Find all anonymous symbols defined during the declaration of this function 5470 // and add to NewFD. This lets us track decls such 'enum Y' in: 5471 // 5472 // void f(enum Y {AA} x) {} 5473 // 5474 // which would otherwise incorrectly end up in the translation unit scope. 5475 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope); 5476 DeclsInPrototypeScope.clear(); 5477 5478 // Process the non-inheritable attributes on this declaration. 5479 ProcessDeclAttributes(S, NewFD, D, 5480 /*NonInheritable=*/true, /*Inheritable=*/false); 5481 5482 // Functions returning a variably modified type violate C99 6.7.5.2p2 5483 // because all functions have linkage. 5484 if (!NewFD->isInvalidDecl() && 5485 NewFD->getResultType()->isVariablyModifiedType()) { 5486 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5487 NewFD->setInvalidDecl(); 5488 } 5489 5490 // Handle attributes. 5491 ProcessDeclAttributes(S, NewFD, D, 5492 /*NonInheritable=*/false, /*Inheritable=*/true); 5493 5494 if (!getLangOpts().CPlusPlus) { 5495 // Perform semantic checking on the function declaration. 5496 bool isExplicitSpecialization=false; 5497 if (!NewFD->isInvalidDecl()) { 5498 if (NewFD->isMain()) 5499 CheckMain(NewFD, D.getDeclSpec()); 5500 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5501 isExplicitSpecialization)); 5502 } 5503 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5504 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5505 "previous declaration set still overloaded"); 5506 } else { 5507 // If the declarator is a template-id, translate the parser's template 5508 // argument list into our AST format. 5509 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5510 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5511 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5512 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5513 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5514 TemplateId->getTemplateArgs(), 5515 TemplateId->NumArgs); 5516 translateTemplateArguments(TemplateArgsPtr, 5517 TemplateArgs); 5518 TemplateArgsPtr.release(); 5519 5520 HasExplicitTemplateArgs = true; 5521 5522 if (NewFD->isInvalidDecl()) { 5523 HasExplicitTemplateArgs = false; 5524 } else if (FunctionTemplate) { 5525 // Function template with explicit template arguments. 5526 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5527 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5528 5529 HasExplicitTemplateArgs = false; 5530 } else if (!isFunctionTemplateSpecialization && 5531 !D.getDeclSpec().isFriendSpecified()) { 5532 // We have encountered something that the user meant to be a 5533 // specialization (because it has explicitly-specified template 5534 // arguments) but that was not introduced with a "template<>" (or had 5535 // too few of them). 5536 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5537 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5538 << FixItHint::CreateInsertion( 5539 D.getDeclSpec().getLocStart(), 5540 "template<> "); 5541 isFunctionTemplateSpecialization = true; 5542 } else { 5543 // "friend void foo<>(int);" is an implicit specialization decl. 5544 isFunctionTemplateSpecialization = true; 5545 } 5546 } else if (isFriend && isFunctionTemplateSpecialization) { 5547 // This combination is only possible in a recovery case; the user 5548 // wrote something like: 5549 // template <> friend void foo(int); 5550 // which we're recovering from as if the user had written: 5551 // friend void foo<>(int); 5552 // Go ahead and fake up a template id. 5553 HasExplicitTemplateArgs = true; 5554 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5555 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5556 } 5557 5558 // If it's a friend (and only if it's a friend), it's possible 5559 // that either the specialized function type or the specialized 5560 // template is dependent, and therefore matching will fail. In 5561 // this case, don't check the specialization yet. 5562 bool InstantiationDependent = false; 5563 if (isFunctionTemplateSpecialization && isFriend && 5564 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5565 TemplateSpecializationType::anyDependentTemplateArguments( 5566 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5567 InstantiationDependent))) { 5568 assert(HasExplicitTemplateArgs && 5569 "friend function specialization without template args"); 5570 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5571 Previous)) 5572 NewFD->setInvalidDecl(); 5573 } else if (isFunctionTemplateSpecialization) { 5574 if (CurContext->isDependentContext() && CurContext->isRecord() 5575 && !isFriend) { 5576 isDependentClassScopeExplicitSpecialization = true; 5577 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ? 5578 diag::ext_function_specialization_in_class : 5579 diag::err_function_specialization_in_class) 5580 << NewFD->getDeclName(); 5581 } else if (CheckFunctionTemplateSpecialization(NewFD, 5582 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5583 Previous)) 5584 NewFD->setInvalidDecl(); 5585 5586 // C++ [dcl.stc]p1: 5587 // A storage-class-specifier shall not be specified in an explicit 5588 // specialization (14.7.3) 5589 if (SC != SC_None) { 5590 if (SC != NewFD->getStorageClass()) 5591 Diag(NewFD->getLocation(), 5592 diag::err_explicit_specialization_inconsistent_storage_class) 5593 << SC 5594 << FixItHint::CreateRemoval( 5595 D.getDeclSpec().getStorageClassSpecLoc()); 5596 5597 else 5598 Diag(NewFD->getLocation(), 5599 diag::ext_explicit_specialization_storage_class) 5600 << FixItHint::CreateRemoval( 5601 D.getDeclSpec().getStorageClassSpecLoc()); 5602 } 5603 5604 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5605 if (CheckMemberSpecialization(NewFD, Previous)) 5606 NewFD->setInvalidDecl(); 5607 } 5608 5609 // Perform semantic checking on the function declaration. 5610 if (!isDependentClassScopeExplicitSpecialization) { 5611 if (NewFD->isInvalidDecl()) { 5612 // If this is a class member, mark the class invalid immediately. 5613 // This avoids some consistency errors later. 5614 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5615 methodDecl->getParent()->setInvalidDecl(); 5616 } else { 5617 if (NewFD->isMain()) 5618 CheckMain(NewFD, D.getDeclSpec()); 5619 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5620 isExplicitSpecialization)); 5621 } 5622 } 5623 5624 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5625 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5626 "previous declaration set still overloaded"); 5627 5628 NamedDecl *PrincipalDecl = (FunctionTemplate 5629 ? cast<NamedDecl>(FunctionTemplate) 5630 : NewFD); 5631 5632 if (isFriend && D.isRedeclaration()) { 5633 AccessSpecifier Access = AS_public; 5634 if (!NewFD->isInvalidDecl()) 5635 Access = NewFD->getPreviousDecl()->getAccess(); 5636 5637 NewFD->setAccess(Access); 5638 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5639 5640 PrincipalDecl->setObjectOfFriendDecl(true); 5641 } 5642 5643 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5644 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5645 PrincipalDecl->setNonMemberOperator(); 5646 5647 // If we have a function template, check the template parameter 5648 // list. This will check and merge default template arguments. 5649 if (FunctionTemplate) { 5650 FunctionTemplateDecl *PrevTemplate = 5651 FunctionTemplate->getPreviousDecl(); 5652 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5653 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5654 D.getDeclSpec().isFriendSpecified() 5655 ? (D.isFunctionDefinition() 5656 ? TPC_FriendFunctionTemplateDefinition 5657 : TPC_FriendFunctionTemplate) 5658 : (D.getCXXScopeSpec().isSet() && 5659 DC && DC->isRecord() && 5660 DC->isDependentContext()) 5661 ? TPC_ClassTemplateMember 5662 : TPC_FunctionTemplate); 5663 } 5664 5665 if (NewFD->isInvalidDecl()) { 5666 // Ignore all the rest of this. 5667 } else if (!D.isRedeclaration()) { 5668 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5669 AddToScope }; 5670 // Fake up an access specifier if it's supposed to be a class member. 5671 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5672 NewFD->setAccess(AS_public); 5673 5674 // Qualified decls generally require a previous declaration. 5675 if (D.getCXXScopeSpec().isSet()) { 5676 // ...with the major exception of templated-scope or 5677 // dependent-scope friend declarations. 5678 5679 // TODO: we currently also suppress this check in dependent 5680 // contexts because (1) the parameter depth will be off when 5681 // matching friend templates and (2) we might actually be 5682 // selecting a friend based on a dependent factor. But there 5683 // are situations where these conditions don't apply and we 5684 // can actually do this check immediately. 5685 if (isFriend && 5686 (TemplateParamLists.size() || 5687 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5688 CurContext->isDependentContext())) { 5689 // ignore these 5690 } else { 5691 // The user tried to provide an out-of-line definition for a 5692 // function that is a member of a class or namespace, but there 5693 // was no such member function declared (C++ [class.mfct]p2, 5694 // C++ [namespace.memdef]p2). For example: 5695 // 5696 // class X { 5697 // void f() const; 5698 // }; 5699 // 5700 // void X::f() { } // ill-formed 5701 // 5702 // Complain about this problem, and attempt to suggest close 5703 // matches (e.g., those that differ only in cv-qualifiers and 5704 // whether the parameter types are references). 5705 5706 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5707 NewFD, 5708 ExtraArgs)) { 5709 AddToScope = ExtraArgs.AddToScope; 5710 return Result; 5711 } 5712 } 5713 5714 // Unqualified local friend declarations are required to resolve 5715 // to something. 5716 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5717 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5718 NewFD, 5719 ExtraArgs)) { 5720 AddToScope = ExtraArgs.AddToScope; 5721 return Result; 5722 } 5723 } 5724 5725 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5726 !isFriend && !isFunctionTemplateSpecialization && 5727 !isExplicitSpecialization) { 5728 // An out-of-line member function declaration must also be a 5729 // definition (C++ [dcl.meaning]p1). 5730 // Note that this is not the case for explicit specializations of 5731 // function templates or member functions of class templates, per 5732 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5733 // extension for compatibility with old SWIG code which likes to 5734 // generate them. 5735 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5736 << D.getCXXScopeSpec().getRange(); 5737 } 5738 } 5739 5740 AddKnownFunctionAttributes(NewFD); 5741 5742 if (NewFD->hasAttr<OverloadableAttr>() && 5743 !NewFD->getType()->getAs<FunctionProtoType>()) { 5744 Diag(NewFD->getLocation(), 5745 diag::err_attribute_overloadable_no_prototype) 5746 << NewFD; 5747 5748 // Turn this into a variadic function with no parameters. 5749 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5750 FunctionProtoType::ExtProtoInfo EPI; 5751 EPI.Variadic = true; 5752 EPI.ExtInfo = FT->getExtInfo(); 5753 5754 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5755 NewFD->setType(R); 5756 } 5757 5758 // If there's a #pragma GCC visibility in scope, and this isn't a class 5759 // member, set the visibility of this function. 5760 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5761 AddPushedVisibilityAttribute(NewFD); 5762 5763 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5764 // marking the function. 5765 AddCFAuditedAttribute(NewFD); 5766 5767 // If this is a locally-scoped extern C function, update the 5768 // map of such names. 5769 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5770 && !NewFD->isInvalidDecl()) 5771 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5772 5773 // Set this FunctionDecl's range up to the right paren. 5774 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5775 5776 if (getLangOpts().CPlusPlus) { 5777 if (FunctionTemplate) { 5778 if (NewFD->isInvalidDecl()) 5779 FunctionTemplate->setInvalidDecl(); 5780 return FunctionTemplate; 5781 } 5782 } 5783 5784 // OpenCL v1.2 s6.8 static is invalid for kernel functions. 5785 if ((getLangOpts().OpenCLVersion >= 120) 5786 && NewFD->hasAttr<OpenCLKernelAttr>() 5787 && (SC == SC_Static)) { 5788 Diag(D.getIdentifierLoc(), diag::err_static_kernel); 5789 D.setInvalidType(); 5790 } 5791 5792 MarkUnusedFileScopedDecl(NewFD); 5793 5794 if (getLangOpts().CUDA) 5795 if (IdentifierInfo *II = NewFD->getIdentifier()) 5796 if (!NewFD->isInvalidDecl() && 5797 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5798 if (II->isStr("cudaConfigureCall")) { 5799 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5800 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5801 5802 Context.setcudaConfigureCallDecl(NewFD); 5803 } 5804 } 5805 5806 // Here we have an function template explicit specialization at class scope. 5807 // The actually specialization will be postponed to template instatiation 5808 // time via the ClassScopeFunctionSpecializationDecl node. 5809 if (isDependentClassScopeExplicitSpecialization) { 5810 ClassScopeFunctionSpecializationDecl *NewSpec = 5811 ClassScopeFunctionSpecializationDecl::Create( 5812 Context, CurContext, SourceLocation(), 5813 cast<CXXMethodDecl>(NewFD), 5814 HasExplicitTemplateArgs, TemplateArgs); 5815 CurContext->addDecl(NewSpec); 5816 AddToScope = false; 5817 } 5818 5819 return NewFD; 5820} 5821 5822/// \brief Perform semantic checking of a new function declaration. 5823/// 5824/// Performs semantic analysis of the new function declaration 5825/// NewFD. This routine performs all semantic checking that does not 5826/// require the actual declarator involved in the declaration, and is 5827/// used both for the declaration of functions as they are parsed 5828/// (called via ActOnDeclarator) and for the declaration of functions 5829/// that have been instantiated via C++ template instantiation (called 5830/// via InstantiateDecl). 5831/// 5832/// \param IsExplicitSpecialization whether this new function declaration is 5833/// an explicit specialization of the previous declaration. 5834/// 5835/// This sets NewFD->isInvalidDecl() to true if there was an error. 5836/// 5837/// \returns true if the function declaration is a redeclaration. 5838bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5839 LookupResult &Previous, 5840 bool IsExplicitSpecialization) { 5841 assert(!NewFD->getResultType()->isVariablyModifiedType() 5842 && "Variably modified return types are not handled here"); 5843 5844 // Check for a previous declaration of this name. 5845 if (Previous.empty() && NewFD->isExternC()) { 5846 // Since we did not find anything by this name and we're declaring 5847 // an extern "C" function, look for a non-visible extern "C" 5848 // declaration with the same name. 5849 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5850 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5851 if (Pos != LocallyScopedExternalDecls.end()) 5852 Previous.addDecl(Pos->second); 5853 } 5854 5855 bool Redeclaration = false; 5856 5857 // Merge or overload the declaration with an existing declaration of 5858 // the same name, if appropriate. 5859 if (!Previous.empty()) { 5860 // Determine whether NewFD is an overload of PrevDecl or 5861 // a declaration that requires merging. If it's an overload, 5862 // there's no more work to do here; we'll just add the new 5863 // function to the scope. 5864 5865 NamedDecl *OldDecl = 0; 5866 if (!AllowOverloadingOfFunction(Previous, Context)) { 5867 Redeclaration = true; 5868 OldDecl = Previous.getFoundDecl(); 5869 } else { 5870 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5871 /*NewIsUsingDecl*/ false)) { 5872 case Ovl_Match: 5873 Redeclaration = true; 5874 break; 5875 5876 case Ovl_NonFunction: 5877 Redeclaration = true; 5878 break; 5879 5880 case Ovl_Overload: 5881 Redeclaration = false; 5882 break; 5883 } 5884 5885 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5886 // If a function name is overloadable in C, then every function 5887 // with that name must be marked "overloadable". 5888 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5889 << Redeclaration << NewFD; 5890 NamedDecl *OverloadedDecl = 0; 5891 if (Redeclaration) 5892 OverloadedDecl = OldDecl; 5893 else if (!Previous.empty()) 5894 OverloadedDecl = Previous.getRepresentativeDecl(); 5895 if (OverloadedDecl) 5896 Diag(OverloadedDecl->getLocation(), 5897 diag::note_attribute_overloadable_prev_overload); 5898 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5899 Context)); 5900 } 5901 } 5902 5903 if (Redeclaration) { 5904 // NewFD and OldDecl represent declarations that need to be 5905 // merged. 5906 if (MergeFunctionDecl(NewFD, OldDecl, S)) { 5907 NewFD->setInvalidDecl(); 5908 return Redeclaration; 5909 } 5910 5911 Previous.clear(); 5912 Previous.addDecl(OldDecl); 5913 5914 if (FunctionTemplateDecl *OldTemplateDecl 5915 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5916 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5917 FunctionTemplateDecl *NewTemplateDecl 5918 = NewFD->getDescribedFunctionTemplate(); 5919 assert(NewTemplateDecl && "Template/non-template mismatch"); 5920 if (CXXMethodDecl *Method 5921 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5922 Method->setAccess(OldTemplateDecl->getAccess()); 5923 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5924 } 5925 5926 // If this is an explicit specialization of a member that is a function 5927 // template, mark it as a member specialization. 5928 if (IsExplicitSpecialization && 5929 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5930 NewTemplateDecl->setMemberSpecialization(); 5931 assert(OldTemplateDecl->isMemberSpecialization()); 5932 } 5933 5934 } else { 5935 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5936 NewFD->setAccess(OldDecl->getAccess()); 5937 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5938 } 5939 } 5940 } 5941 5942 // Semantic checking for this function declaration (in isolation). 5943 if (getLangOpts().CPlusPlus) { 5944 // C++-specific checks. 5945 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5946 CheckConstructor(Constructor); 5947 } else if (CXXDestructorDecl *Destructor = 5948 dyn_cast<CXXDestructorDecl>(NewFD)) { 5949 CXXRecordDecl *Record = Destructor->getParent(); 5950 QualType ClassType = Context.getTypeDeclType(Record); 5951 5952 // FIXME: Shouldn't we be able to perform this check even when the class 5953 // type is dependent? Both gcc and edg can handle that. 5954 if (!ClassType->isDependentType()) { 5955 DeclarationName Name 5956 = Context.DeclarationNames.getCXXDestructorName( 5957 Context.getCanonicalType(ClassType)); 5958 if (NewFD->getDeclName() != Name) { 5959 Diag(NewFD->getLocation(), diag::err_destructor_name); 5960 NewFD->setInvalidDecl(); 5961 return Redeclaration; 5962 } 5963 } 5964 } else if (CXXConversionDecl *Conversion 5965 = dyn_cast<CXXConversionDecl>(NewFD)) { 5966 ActOnConversionDeclarator(Conversion); 5967 } 5968 5969 // Find any virtual functions that this function overrides. 5970 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5971 if (!Method->isFunctionTemplateSpecialization() && 5972 !Method->getDescribedFunctionTemplate()) { 5973 if (AddOverriddenMethods(Method->getParent(), Method)) { 5974 // If the function was marked as "static", we have a problem. 5975 if (NewFD->getStorageClass() == SC_Static) { 5976 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5977 << NewFD->getDeclName(); 5978 for (CXXMethodDecl::method_iterator 5979 Overridden = Method->begin_overridden_methods(), 5980 OverriddenEnd = Method->end_overridden_methods(); 5981 Overridden != OverriddenEnd; 5982 ++Overridden) { 5983 Diag((*Overridden)->getLocation(), 5984 diag::note_overridden_virtual_function); 5985 } 5986 } 5987 } 5988 } 5989 5990 if (Method->isStatic()) 5991 checkThisInStaticMemberFunctionType(Method); 5992 } 5993 5994 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5995 if (NewFD->isOverloadedOperator() && 5996 CheckOverloadedOperatorDeclaration(NewFD)) { 5997 NewFD->setInvalidDecl(); 5998 return Redeclaration; 5999 } 6000 6001 // Extra checking for C++0x literal operators (C++0x [over.literal]). 6002 if (NewFD->getLiteralIdentifier() && 6003 CheckLiteralOperatorDeclaration(NewFD)) { 6004 NewFD->setInvalidDecl(); 6005 return Redeclaration; 6006 } 6007 6008 // In C++, check default arguments now that we have merged decls. Unless 6009 // the lexical context is the class, because in this case this is done 6010 // during delayed parsing anyway. 6011 if (!CurContext->isRecord()) 6012 CheckCXXDefaultArguments(NewFD); 6013 6014 // If this function declares a builtin function, check the type of this 6015 // declaration against the expected type for the builtin. 6016 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 6017 ASTContext::GetBuiltinTypeError Error; 6018 QualType T = Context.GetBuiltinType(BuiltinID, Error); 6019 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 6020 // The type of this function differs from the type of the builtin, 6021 // so forget about the builtin entirely. 6022 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 6023 } 6024 } 6025 6026 // If this function is declared as being extern "C", then check to see if 6027 // the function returns a UDT (class, struct, or union type) that is not C 6028 // compatible, and if it does, warn the user. 6029 if (NewFD->isExternC()) { 6030 QualType R = NewFD->getResultType(); 6031 if (R->isIncompleteType() && !R->isVoidType()) 6032 Diag(NewFD->getLocation(), diag::warn_return_value_udt_incomplete) 6033 << NewFD << R; 6034 else if (!R.isPODType(Context) && !R->isVoidType() && 6035 !R->isObjCObjectPointerType()) 6036 Diag(NewFD->getLocation(), diag::warn_return_value_udt) << NewFD << R; 6037 } 6038 } 6039 return Redeclaration; 6040} 6041 6042void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 6043 // C++11 [basic.start.main]p3: A program that declares main to be inline, 6044 // static or constexpr is ill-formed. 6045 // C99 6.7.4p4: In a hosted environment, the inline function specifier 6046 // shall not appear in a declaration of main. 6047 // static main is not an error under C99, but we should warn about it. 6048 if (FD->getStorageClass() == SC_Static) 6049 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus 6050 ? diag::err_static_main : diag::warn_static_main) 6051 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 6052 if (FD->isInlineSpecified()) 6053 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 6054 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 6055 if (FD->isConstexpr()) { 6056 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 6057 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 6058 FD->setConstexpr(false); 6059 } 6060 6061 QualType T = FD->getType(); 6062 assert(T->isFunctionType() && "function decl is not of function type"); 6063 const FunctionType* FT = T->castAs<FunctionType>(); 6064 6065 // All the standards say that main() should should return 'int'. 6066 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 6067 // In C and C++, main magically returns 0 if you fall off the end; 6068 // set the flag which tells us that. 6069 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6070 FD->setHasImplicitReturnZero(true); 6071 6072 // In C with GNU extensions we allow main() to have non-integer return 6073 // type, but we should warn about the extension, and we disable the 6074 // implicit-return-zero rule. 6075 } else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) { 6076 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); 6077 6078 // Otherwise, this is just a flat-out error. 6079 } else { 6080 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 6081 FD->setInvalidDecl(true); 6082 } 6083 6084 // Treat protoless main() as nullary. 6085 if (isa<FunctionNoProtoType>(FT)) return; 6086 6087 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 6088 unsigned nparams = FTP->getNumArgs(); 6089 assert(FD->getNumParams() == nparams); 6090 6091 bool HasExtraParameters = (nparams > 3); 6092 6093 // Darwin passes an undocumented fourth argument of type char**. If 6094 // other platforms start sprouting these, the logic below will start 6095 // getting shifty. 6096 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 6097 HasExtraParameters = false; 6098 6099 if (HasExtraParameters) { 6100 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 6101 FD->setInvalidDecl(true); 6102 nparams = 3; 6103 } 6104 6105 // FIXME: a lot of the following diagnostics would be improved 6106 // if we had some location information about types. 6107 6108 QualType CharPP = 6109 Context.getPointerType(Context.getPointerType(Context.CharTy)); 6110 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 6111 6112 for (unsigned i = 0; i < nparams; ++i) { 6113 QualType AT = FTP->getArgType(i); 6114 6115 bool mismatch = true; 6116 6117 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 6118 mismatch = false; 6119 else if (Expected[i] == CharPP) { 6120 // As an extension, the following forms are okay: 6121 // char const ** 6122 // char const * const * 6123 // char * const * 6124 6125 QualifierCollector qs; 6126 const PointerType* PT; 6127 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 6128 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 6129 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 6130 qs.removeConst(); 6131 mismatch = !qs.empty(); 6132 } 6133 } 6134 6135 if (mismatch) { 6136 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 6137 // TODO: suggest replacing given type with expected type 6138 FD->setInvalidDecl(true); 6139 } 6140 } 6141 6142 if (nparams == 1 && !FD->isInvalidDecl()) { 6143 Diag(FD->getLocation(), diag::warn_main_one_arg); 6144 } 6145 6146 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 6147 Diag(FD->getLocation(), diag::err_main_template_decl); 6148 FD->setInvalidDecl(); 6149 } 6150} 6151 6152bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 6153 // FIXME: Need strict checking. In C89, we need to check for 6154 // any assignment, increment, decrement, function-calls, or 6155 // commas outside of a sizeof. In C99, it's the same list, 6156 // except that the aforementioned are allowed in unevaluated 6157 // expressions. Everything else falls under the 6158 // "may accept other forms of constant expressions" exception. 6159 // (We never end up here for C++, so the constant expression 6160 // rules there don't matter.) 6161 if (Init->isConstantInitializer(Context, false)) 6162 return false; 6163 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 6164 << Init->getSourceRange(); 6165 return true; 6166} 6167 6168namespace { 6169 // Visits an initialization expression to see if OrigDecl is evaluated in 6170 // its own initialization and throws a warning if it does. 6171 class SelfReferenceChecker 6172 : public EvaluatedExprVisitor<SelfReferenceChecker> { 6173 Sema &S; 6174 Decl *OrigDecl; 6175 bool isRecordType; 6176 bool isPODType; 6177 bool isReferenceType; 6178 6179 public: 6180 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 6181 6182 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 6183 S(S), OrigDecl(OrigDecl) { 6184 isPODType = false; 6185 isRecordType = false; 6186 isReferenceType = false; 6187 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 6188 isPODType = VD->getType().isPODType(S.Context); 6189 isRecordType = VD->getType()->isRecordType(); 6190 isReferenceType = VD->getType()->isReferenceType(); 6191 } 6192 } 6193 6194 // Sometimes, the expression passed in lacks the casts that are used 6195 // to determine which DeclRefExpr's to check. Assume that the casts 6196 // are present and continue visiting the expression. 6197 void HandleExpr(Expr *E) { 6198 // Skip checking T a = a where T is not a record or reference type. 6199 // Doing so is a way to silence uninitialized warnings. 6200 if (isRecordType || isReferenceType) 6201 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 6202 HandleDeclRefExpr(DRE); 6203 6204 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 6205 HandleValue(CO->getTrueExpr()); 6206 HandleValue(CO->getFalseExpr()); 6207 } 6208 6209 Visit(E); 6210 } 6211 6212 // For most expressions, the cast is directly above the DeclRefExpr. 6213 // For conditional operators, the cast can be outside the conditional 6214 // operator if both expressions are DeclRefExpr's. 6215 void HandleValue(Expr *E) { 6216 E = E->IgnoreParenImpCasts(); 6217 if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) { 6218 HandleDeclRefExpr(DRE); 6219 return; 6220 } 6221 6222 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 6223 HandleValue(CO->getTrueExpr()); 6224 HandleValue(CO->getFalseExpr()); 6225 } 6226 } 6227 6228 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 6229 if ((!isRecordType && E->getCastKind() == CK_LValueToRValue) || 6230 (isRecordType && E->getCastKind() == CK_NoOp)) 6231 HandleValue(E->getSubExpr()); 6232 6233 Inherited::VisitImplicitCastExpr(E); 6234 } 6235 6236 void VisitMemberExpr(MemberExpr *E) { 6237 // Don't warn on arrays since they can be treated as pointers. 6238 if (E->getType()->canDecayToPointerType()) return; 6239 6240 ValueDecl *VD = E->getMemberDecl(); 6241 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(VD); 6242 if (isa<FieldDecl>(VD) || (MD && !MD->isStatic())) 6243 if (DeclRefExpr *DRE 6244 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 6245 HandleDeclRefExpr(DRE); 6246 return; 6247 } 6248 6249 Inherited::VisitMemberExpr(E); 6250 } 6251 6252 void VisitUnaryOperator(UnaryOperator *E) { 6253 // For POD record types, addresses of its own members are well-defined. 6254 if (E->getOpcode() == UO_AddrOf && isRecordType && isPODType && 6255 isa<MemberExpr>(E->getSubExpr()->IgnoreParens())) return; 6256 Inherited::VisitUnaryOperator(E); 6257 } 6258 6259 void VisitObjCMessageExpr(ObjCMessageExpr *E) { return; } 6260 6261 void HandleDeclRefExpr(DeclRefExpr *DRE) { 6262 Decl* ReferenceDecl = DRE->getDecl(); 6263 if (OrigDecl != ReferenceDecl) return; 6264 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 6265 Sema::NotForRedeclaration); 6266 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 6267 S.PDiag(diag::warn_uninit_self_reference_in_init) 6268 << Result.getLookupName() 6269 << OrigDecl->getLocation() 6270 << DRE->getSourceRange()); 6271 } 6272 }; 6273} 6274 6275/// CheckSelfReference - Warns if OrigDecl is used in expression E. 6276void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 6277 SelfReferenceChecker(*this, OrigDecl).HandleExpr(E); 6278} 6279 6280/// AddInitializerToDecl - Adds the initializer Init to the 6281/// declaration dcl. If DirectInit is true, this is C++ direct 6282/// initialization rather than copy initialization. 6283void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 6284 bool DirectInit, bool TypeMayContainAuto) { 6285 // If there is no declaration, there was an error parsing it. Just ignore 6286 // the initializer. 6287 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 6288 return; 6289 6290 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6291 // With declarators parsed the way they are, the parser cannot 6292 // distinguish between a normal initializer and a pure-specifier. 6293 // Thus this grotesque test. 6294 IntegerLiteral *IL; 6295 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6296 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6297 CheckPureMethod(Method, Init->getSourceRange()); 6298 else { 6299 Diag(Method->getLocation(), diag::err_member_function_initialization) 6300 << Method->getDeclName() << Init->getSourceRange(); 6301 Method->setInvalidDecl(); 6302 } 6303 return; 6304 } 6305 6306 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6307 if (!VDecl) { 6308 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6309 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6310 RealDecl->setInvalidDecl(); 6311 return; 6312 } 6313 6314 // Check for self-references within variable initializers. 6315 // Variables declared within a function/method body (except for references) 6316 // are handled by a dataflow analysis. 6317 // Record types initialized by initializer list are handled here. 6318 // Initialization by constructors are handled in TryConstructorInitialization. 6319 if ((!VDecl->hasLocalStorage() || VDecl->getType()->isReferenceType()) && 6320 (isa<InitListExpr>(Init) || !VDecl->getType()->isRecordType())) 6321 CheckSelfReference(RealDecl, Init); 6322 6323 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); 6324 6325 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6326 AutoType *Auto = 0; 6327 if (TypeMayContainAuto && 6328 (Auto = VDecl->getType()->getContainedAutoType()) && 6329 !Auto->isDeduced()) { 6330 Expr *DeduceInit = Init; 6331 // Initializer could be a C++ direct-initializer. Deduction only works if it 6332 // contains exactly one expression. 6333 if (CXXDirectInit) { 6334 if (CXXDirectInit->getNumExprs() == 0) { 6335 // It isn't possible to write this directly, but it is possible to 6336 // end up in this situation with "auto x(some_pack...);" 6337 Diag(CXXDirectInit->getLocStart(), 6338 diag::err_auto_var_init_no_expression) 6339 << VDecl->getDeclName() << VDecl->getType() 6340 << VDecl->getSourceRange(); 6341 RealDecl->setInvalidDecl(); 6342 return; 6343 } else if (CXXDirectInit->getNumExprs() > 1) { 6344 Diag(CXXDirectInit->getExpr(1)->getLocStart(), 6345 diag::err_auto_var_init_multiple_expressions) 6346 << VDecl->getDeclName() << VDecl->getType() 6347 << VDecl->getSourceRange(); 6348 RealDecl->setInvalidDecl(); 6349 return; 6350 } else { 6351 DeduceInit = CXXDirectInit->getExpr(0); 6352 } 6353 } 6354 TypeSourceInfo *DeducedType = 0; 6355 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) == 6356 DAR_Failed) 6357 DiagnoseAutoDeductionFailure(VDecl, DeduceInit); 6358 if (!DeducedType) { 6359 RealDecl->setInvalidDecl(); 6360 return; 6361 } 6362 VDecl->setTypeSourceInfo(DeducedType); 6363 VDecl->setType(DeducedType->getType()); 6364 VDecl->ClearLinkageCache(); 6365 6366 // In ARC, infer lifetime. 6367 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6368 VDecl->setInvalidDecl(); 6369 6370 // Warn if we deduced 'id'. 'auto' usually implies type-safety, but using 6371 // 'id' instead of a specific object type prevents most of our usual checks. 6372 // We only want to warn outside of template instantiations, though: 6373 // inside a template, the 'id' could have come from a parameter. 6374 if (ActiveTemplateInstantiations.empty() && 6375 DeducedType->getType()->isObjCIdType()) { 6376 SourceLocation Loc = DeducedType->getTypeLoc().getBeginLoc(); 6377 Diag(Loc, diag::warn_auto_var_is_id) 6378 << VDecl->getDeclName() << DeduceInit->getSourceRange(); 6379 } 6380 6381 // If this is a redeclaration, check that the type we just deduced matches 6382 // the previously declared type. 6383 if (VarDecl *Old = VDecl->getPreviousDecl()) 6384 MergeVarDeclTypes(VDecl, Old); 6385 } 6386 6387 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6388 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6389 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6390 VDecl->setInvalidDecl(); 6391 return; 6392 } 6393 6394 if (!VDecl->getType()->isDependentType()) { 6395 // A definition must end up with a complete type, which means it must be 6396 // complete with the restriction that an array type might be completed by 6397 // the initializer; note that later code assumes this restriction. 6398 QualType BaseDeclType = VDecl->getType(); 6399 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6400 BaseDeclType = Array->getElementType(); 6401 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6402 diag::err_typecheck_decl_incomplete_type)) { 6403 RealDecl->setInvalidDecl(); 6404 return; 6405 } 6406 6407 // The variable can not have an abstract class type. 6408 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6409 diag::err_abstract_type_in_decl, 6410 AbstractVariableType)) 6411 VDecl->setInvalidDecl(); 6412 } 6413 6414 const VarDecl *Def; 6415 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6416 Diag(VDecl->getLocation(), diag::err_redefinition) 6417 << VDecl->getDeclName(); 6418 Diag(Def->getLocation(), diag::note_previous_definition); 6419 VDecl->setInvalidDecl(); 6420 return; 6421 } 6422 6423 const VarDecl* PrevInit = 0; 6424 if (getLangOpts().CPlusPlus) { 6425 // C++ [class.static.data]p4 6426 // If a static data member is of const integral or const 6427 // enumeration type, its declaration in the class definition can 6428 // specify a constant-initializer which shall be an integral 6429 // constant expression (5.19). In that case, the member can appear 6430 // in integral constant expressions. The member shall still be 6431 // defined in a namespace scope if it is used in the program and the 6432 // namespace scope definition shall not contain an initializer. 6433 // 6434 // We already performed a redefinition check above, but for static 6435 // data members we also need to check whether there was an in-class 6436 // declaration with an initializer. 6437 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6438 Diag(VDecl->getLocation(), diag::err_redefinition) 6439 << VDecl->getDeclName(); 6440 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6441 return; 6442 } 6443 6444 if (VDecl->hasLocalStorage()) 6445 getCurFunction()->setHasBranchProtectedScope(); 6446 6447 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6448 VDecl->setInvalidDecl(); 6449 return; 6450 } 6451 } 6452 6453 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6454 // a kernel function cannot be initialized." 6455 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6456 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6457 VDecl->setInvalidDecl(); 6458 return; 6459 } 6460 6461 // Get the decls type and save a reference for later, since 6462 // CheckInitializerTypes may change it. 6463 QualType DclT = VDecl->getType(), SavT = DclT; 6464 6465 // Top-level message sends default to 'id' when we're in a debugger 6466 // and we are assigning it to a variable of 'id' type. 6467 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCIdType()) 6468 if (Init->getType() == Context.UnknownAnyTy && isa<ObjCMessageExpr>(Init)) { 6469 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); 6470 if (Result.isInvalid()) { 6471 VDecl->setInvalidDecl(); 6472 return; 6473 } 6474 Init = Result.take(); 6475 } 6476 6477 // Perform the initialization. 6478 if (!VDecl->isInvalidDecl()) { 6479 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6480 InitializationKind Kind 6481 = DirectInit ? 6482 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6483 Init->getLocStart(), 6484 Init->getLocEnd()) 6485 : InitializationKind::CreateDirectList( 6486 VDecl->getLocation()) 6487 : InitializationKind::CreateCopy(VDecl->getLocation(), 6488 Init->getLocStart()); 6489 6490 Expr **Args = &Init; 6491 unsigned NumArgs = 1; 6492 if (CXXDirectInit) { 6493 Args = CXXDirectInit->getExprs(); 6494 NumArgs = CXXDirectInit->getNumExprs(); 6495 } 6496 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs); 6497 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6498 MultiExprArg(*this, Args,NumArgs), 6499 &DclT); 6500 if (Result.isInvalid()) { 6501 VDecl->setInvalidDecl(); 6502 return; 6503 } 6504 6505 Init = Result.takeAs<Expr>(); 6506 } 6507 6508 // If the type changed, it means we had an incomplete type that was 6509 // completed by the initializer. For example: 6510 // int ary[] = { 1, 3, 5 }; 6511 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6512 if (!VDecl->isInvalidDecl() && (DclT != SavT)) 6513 VDecl->setType(DclT); 6514 6515 // Check any implicit conversions within the expression. 6516 CheckImplicitConversions(Init, VDecl->getLocation()); 6517 6518 if (!VDecl->isInvalidDecl()) 6519 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6520 6521 Init = MaybeCreateExprWithCleanups(Init); 6522 // Attach the initializer to the decl. 6523 VDecl->setInit(Init); 6524 6525 if (VDecl->isLocalVarDecl()) { 6526 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6527 // static storage duration shall be constant expressions or string literals. 6528 // C++ does not have this restriction. 6529 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() && 6530 VDecl->getStorageClass() == SC_Static) 6531 CheckForConstantInitializer(Init, DclT); 6532 } else if (VDecl->isStaticDataMember() && 6533 VDecl->getLexicalDeclContext()->isRecord()) { 6534 // This is an in-class initialization for a static data member, e.g., 6535 // 6536 // struct S { 6537 // static const int value = 17; 6538 // }; 6539 6540 // C++ [class.mem]p4: 6541 // A member-declarator can contain a constant-initializer only 6542 // if it declares a static member (9.4) of const integral or 6543 // const enumeration type, see 9.4.2. 6544 // 6545 // C++11 [class.static.data]p3: 6546 // If a non-volatile const static data member is of integral or 6547 // enumeration type, its declaration in the class definition can 6548 // specify a brace-or-equal-initializer in which every initalizer-clause 6549 // that is an assignment-expression is a constant expression. A static 6550 // data member of literal type can be declared in the class definition 6551 // with the constexpr specifier; if so, its declaration shall specify a 6552 // brace-or-equal-initializer in which every initializer-clause that is 6553 // an assignment-expression is a constant expression. 6554 6555 // Do nothing on dependent types. 6556 if (DclT->isDependentType()) { 6557 6558 // Allow any 'static constexpr' members, whether or not they are of literal 6559 // type. We separately check that every constexpr variable is of literal 6560 // type. 6561 } else if (VDecl->isConstexpr()) { 6562 6563 // Require constness. 6564 } else if (!DclT.isConstQualified()) { 6565 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6566 << Init->getSourceRange(); 6567 VDecl->setInvalidDecl(); 6568 6569 // We allow integer constant expressions in all cases. 6570 } else if (DclT->isIntegralOrEnumerationType()) { 6571 // Check whether the expression is a constant expression. 6572 SourceLocation Loc; 6573 if (getLangOpts().CPlusPlus0x && DclT.isVolatileQualified()) 6574 // In C++11, a non-constexpr const static data member with an 6575 // in-class initializer cannot be volatile. 6576 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6577 else if (Init->isValueDependent()) 6578 ; // Nothing to check. 6579 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6580 ; // Ok, it's an ICE! 6581 else if (Init->isEvaluatable(Context)) { 6582 // If we can constant fold the initializer through heroics, accept it, 6583 // but report this as a use of an extension for -pedantic. 6584 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6585 << Init->getSourceRange(); 6586 } else { 6587 // Otherwise, this is some crazy unknown case. Report the issue at the 6588 // location provided by the isIntegerConstantExpr failed check. 6589 Diag(Loc, diag::err_in_class_initializer_non_constant) 6590 << Init->getSourceRange(); 6591 VDecl->setInvalidDecl(); 6592 } 6593 6594 // We allow foldable floating-point constants as an extension. 6595 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6596 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6597 << DclT << Init->getSourceRange(); 6598 if (getLangOpts().CPlusPlus0x) 6599 Diag(VDecl->getLocation(), 6600 diag::note_in_class_initializer_float_type_constexpr) 6601 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6602 6603 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6604 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6605 << Init->getSourceRange(); 6606 VDecl->setInvalidDecl(); 6607 } 6608 6609 // Suggest adding 'constexpr' in C++11 for literal types. 6610 } else if (getLangOpts().CPlusPlus0x && DclT->isLiteralType()) { 6611 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6612 << DclT << Init->getSourceRange() 6613 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6614 VDecl->setConstexpr(true); 6615 6616 } else { 6617 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6618 << DclT << Init->getSourceRange(); 6619 VDecl->setInvalidDecl(); 6620 } 6621 } else if (VDecl->isFileVarDecl()) { 6622 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6623 (!getLangOpts().CPlusPlus || 6624 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6625 Diag(VDecl->getLocation(), diag::warn_extern_init); 6626 6627 // C99 6.7.8p4. All file scoped initializers need to be constant. 6628 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) 6629 CheckForConstantInitializer(Init, DclT); 6630 } 6631 6632 // We will represent direct-initialization similarly to copy-initialization: 6633 // int x(1); -as-> int x = 1; 6634 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6635 // 6636 // Clients that want to distinguish between the two forms, can check for 6637 // direct initializer using VarDecl::getInitStyle(). 6638 // A major benefit is that clients that don't particularly care about which 6639 // exactly form was it (like the CodeGen) can handle both cases without 6640 // special case code. 6641 6642 // C++ 8.5p11: 6643 // The form of initialization (using parentheses or '=') is generally 6644 // insignificant, but does matter when the entity being initialized has a 6645 // class type. 6646 if (CXXDirectInit) { 6647 assert(DirectInit && "Call-style initializer must be direct init."); 6648 VDecl->setInitStyle(VarDecl::CallInit); 6649 } else if (DirectInit) { 6650 // This must be list-initialization. No other way is direct-initialization. 6651 VDecl->setInitStyle(VarDecl::ListInit); 6652 } 6653 6654 CheckCompleteVariableDeclaration(VDecl); 6655} 6656 6657/// ActOnInitializerError - Given that there was an error parsing an 6658/// initializer for the given declaration, try to return to some form 6659/// of sanity. 6660void Sema::ActOnInitializerError(Decl *D) { 6661 // Our main concern here is re-establishing invariants like "a 6662 // variable's type is either dependent or complete". 6663 if (!D || D->isInvalidDecl()) return; 6664 6665 VarDecl *VD = dyn_cast<VarDecl>(D); 6666 if (!VD) return; 6667 6668 // Auto types are meaningless if we can't make sense of the initializer. 6669 if (ParsingInitForAutoVars.count(D)) { 6670 D->setInvalidDecl(); 6671 return; 6672 } 6673 6674 QualType Ty = VD->getType(); 6675 if (Ty->isDependentType()) return; 6676 6677 // Require a complete type. 6678 if (RequireCompleteType(VD->getLocation(), 6679 Context.getBaseElementType(Ty), 6680 diag::err_typecheck_decl_incomplete_type)) { 6681 VD->setInvalidDecl(); 6682 return; 6683 } 6684 6685 // Require an abstract type. 6686 if (RequireNonAbstractType(VD->getLocation(), Ty, 6687 diag::err_abstract_type_in_decl, 6688 AbstractVariableType)) { 6689 VD->setInvalidDecl(); 6690 return; 6691 } 6692 6693 // Don't bother complaining about constructors or destructors, 6694 // though. 6695} 6696 6697void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6698 bool TypeMayContainAuto) { 6699 // If there is no declaration, there was an error parsing it. Just ignore it. 6700 if (RealDecl == 0) 6701 return; 6702 6703 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6704 QualType Type = Var->getType(); 6705 6706 // C++11 [dcl.spec.auto]p3 6707 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6708 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6709 << Var->getDeclName() << Type; 6710 Var->setInvalidDecl(); 6711 return; 6712 } 6713 6714 // C++11 [class.static.data]p3: A static data member can be declared with 6715 // the constexpr specifier; if so, its declaration shall specify 6716 // a brace-or-equal-initializer. 6717 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6718 // the definition of a variable [...] or the declaration of a static data 6719 // member. 6720 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6721 if (Var->isStaticDataMember()) 6722 Diag(Var->getLocation(), 6723 diag::err_constexpr_static_mem_var_requires_init) 6724 << Var->getDeclName(); 6725 else 6726 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6727 Var->setInvalidDecl(); 6728 return; 6729 } 6730 6731 switch (Var->isThisDeclarationADefinition()) { 6732 case VarDecl::Definition: 6733 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6734 break; 6735 6736 // We have an out-of-line definition of a static data member 6737 // that has an in-class initializer, so we type-check this like 6738 // a declaration. 6739 // 6740 // Fall through 6741 6742 case VarDecl::DeclarationOnly: 6743 // It's only a declaration. 6744 6745 // Block scope. C99 6.7p7: If an identifier for an object is 6746 // declared with no linkage (C99 6.2.2p6), the type for the 6747 // object shall be complete. 6748 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6749 !Var->getLinkage() && !Var->isInvalidDecl() && 6750 RequireCompleteType(Var->getLocation(), Type, 6751 diag::err_typecheck_decl_incomplete_type)) 6752 Var->setInvalidDecl(); 6753 6754 // Make sure that the type is not abstract. 6755 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6756 RequireNonAbstractType(Var->getLocation(), Type, 6757 diag::err_abstract_type_in_decl, 6758 AbstractVariableType)) 6759 Var->setInvalidDecl(); 6760 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6761 Var->getStorageClass() == SC_PrivateExtern) { 6762 Diag(Var->getLocation(), diag::warn_private_extern); 6763 Diag(Var->getLocation(), diag::note_private_extern); 6764 } 6765 6766 return; 6767 6768 case VarDecl::TentativeDefinition: 6769 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6770 // object that has file scope without an initializer, and without a 6771 // storage-class specifier or with the storage-class specifier "static", 6772 // constitutes a tentative definition. Note: A tentative definition with 6773 // external linkage is valid (C99 6.2.2p5). 6774 if (!Var->isInvalidDecl()) { 6775 if (const IncompleteArrayType *ArrayT 6776 = Context.getAsIncompleteArrayType(Type)) { 6777 if (RequireCompleteType(Var->getLocation(), 6778 ArrayT->getElementType(), 6779 diag::err_illegal_decl_array_incomplete_type)) 6780 Var->setInvalidDecl(); 6781 } else if (Var->getStorageClass() == SC_Static) { 6782 // C99 6.9.2p3: If the declaration of an identifier for an object is 6783 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6784 // declared type shall not be an incomplete type. 6785 // NOTE: code such as the following 6786 // static struct s; 6787 // struct s { int a; }; 6788 // is accepted by gcc. Hence here we issue a warning instead of 6789 // an error and we do not invalidate the static declaration. 6790 // NOTE: to avoid multiple warnings, only check the first declaration. 6791 if (Var->getPreviousDecl() == 0) 6792 RequireCompleteType(Var->getLocation(), Type, 6793 diag::ext_typecheck_decl_incomplete_type); 6794 } 6795 } 6796 6797 // Record the tentative definition; we're done. 6798 if (!Var->isInvalidDecl()) 6799 TentativeDefinitions.push_back(Var); 6800 return; 6801 } 6802 6803 // Provide a specific diagnostic for uninitialized variable 6804 // definitions with incomplete array type. 6805 if (Type->isIncompleteArrayType()) { 6806 Diag(Var->getLocation(), 6807 diag::err_typecheck_incomplete_array_needs_initializer); 6808 Var->setInvalidDecl(); 6809 return; 6810 } 6811 6812 // Provide a specific diagnostic for uninitialized variable 6813 // definitions with reference type. 6814 if (Type->isReferenceType()) { 6815 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6816 << Var->getDeclName() 6817 << SourceRange(Var->getLocation(), Var->getLocation()); 6818 Var->setInvalidDecl(); 6819 return; 6820 } 6821 6822 // Do not attempt to type-check the default initializer for a 6823 // variable with dependent type. 6824 if (Type->isDependentType()) 6825 return; 6826 6827 if (Var->isInvalidDecl()) 6828 return; 6829 6830 if (RequireCompleteType(Var->getLocation(), 6831 Context.getBaseElementType(Type), 6832 diag::err_typecheck_decl_incomplete_type)) { 6833 Var->setInvalidDecl(); 6834 return; 6835 } 6836 6837 // The variable can not have an abstract class type. 6838 if (RequireNonAbstractType(Var->getLocation(), Type, 6839 diag::err_abstract_type_in_decl, 6840 AbstractVariableType)) { 6841 Var->setInvalidDecl(); 6842 return; 6843 } 6844 6845 // Check for jumps past the implicit initializer. C++0x 6846 // clarifies that this applies to a "variable with automatic 6847 // storage duration", not a "local variable". 6848 // C++11 [stmt.dcl]p3 6849 // A program that jumps from a point where a variable with automatic 6850 // storage duration is not in scope to a point where it is in scope is 6851 // ill-formed unless the variable has scalar type, class type with a 6852 // trivial default constructor and a trivial destructor, a cv-qualified 6853 // version of one of these types, or an array of one of the preceding 6854 // types and is declared without an initializer. 6855 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) { 6856 if (const RecordType *Record 6857 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6858 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6859 // Mark the function for further checking even if the looser rules of 6860 // C++11 do not require such checks, so that we can diagnose 6861 // incompatibilities with C++98. 6862 if (!CXXRecord->isPOD()) 6863 getCurFunction()->setHasBranchProtectedScope(); 6864 } 6865 } 6866 6867 // C++03 [dcl.init]p9: 6868 // If no initializer is specified for an object, and the 6869 // object is of (possibly cv-qualified) non-POD class type (or 6870 // array thereof), the object shall be default-initialized; if 6871 // the object is of const-qualified type, the underlying class 6872 // type shall have a user-declared default 6873 // constructor. Otherwise, if no initializer is specified for 6874 // a non- static object, the object and its subobjects, if 6875 // any, have an indeterminate initial value); if the object 6876 // or any of its subobjects are of const-qualified type, the 6877 // program is ill-formed. 6878 // C++0x [dcl.init]p11: 6879 // If no initializer is specified for an object, the object is 6880 // default-initialized; [...]. 6881 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6882 InitializationKind Kind 6883 = InitializationKind::CreateDefault(Var->getLocation()); 6884 6885 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6886 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6887 MultiExprArg(*this, 0, 0)); 6888 if (Init.isInvalid()) 6889 Var->setInvalidDecl(); 6890 else if (Init.get()) { 6891 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6892 // This is important for template substitution. 6893 Var->setInitStyle(VarDecl::CallInit); 6894 } 6895 6896 CheckCompleteVariableDeclaration(Var); 6897 } 6898} 6899 6900void Sema::ActOnCXXForRangeDecl(Decl *D) { 6901 VarDecl *VD = dyn_cast<VarDecl>(D); 6902 if (!VD) { 6903 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6904 D->setInvalidDecl(); 6905 return; 6906 } 6907 6908 VD->setCXXForRangeDecl(true); 6909 6910 // for-range-declaration cannot be given a storage class specifier. 6911 int Error = -1; 6912 switch (VD->getStorageClassAsWritten()) { 6913 case SC_None: 6914 break; 6915 case SC_Extern: 6916 Error = 0; 6917 break; 6918 case SC_Static: 6919 Error = 1; 6920 break; 6921 case SC_PrivateExtern: 6922 Error = 2; 6923 break; 6924 case SC_Auto: 6925 Error = 3; 6926 break; 6927 case SC_Register: 6928 Error = 4; 6929 break; 6930 case SC_OpenCLWorkGroupLocal: 6931 llvm_unreachable("Unexpected storage class"); 6932 } 6933 if (VD->isConstexpr()) 6934 Error = 5; 6935 if (Error != -1) { 6936 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6937 << VD->getDeclName() << Error; 6938 D->setInvalidDecl(); 6939 } 6940} 6941 6942void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6943 if (var->isInvalidDecl()) return; 6944 6945 // In ARC, don't allow jumps past the implicit initialization of a 6946 // local retaining variable. 6947 if (getLangOpts().ObjCAutoRefCount && 6948 var->hasLocalStorage()) { 6949 switch (var->getType().getObjCLifetime()) { 6950 case Qualifiers::OCL_None: 6951 case Qualifiers::OCL_ExplicitNone: 6952 case Qualifiers::OCL_Autoreleasing: 6953 break; 6954 6955 case Qualifiers::OCL_Weak: 6956 case Qualifiers::OCL_Strong: 6957 getCurFunction()->setHasBranchProtectedScope(); 6958 break; 6959 } 6960 } 6961 6962 // All the following checks are C++ only. 6963 if (!getLangOpts().CPlusPlus) return; 6964 6965 QualType baseType = Context.getBaseElementType(var->getType()); 6966 if (baseType->isDependentType()) return; 6967 6968 // __block variables might require us to capture a copy-initializer. 6969 if (var->hasAttr<BlocksAttr>()) { 6970 // It's currently invalid to ever have a __block variable with an 6971 // array type; should we diagnose that here? 6972 6973 // Regardless, we don't want to ignore array nesting when 6974 // constructing this copy. 6975 QualType type = var->getType(); 6976 6977 if (type->isStructureOrClassType()) { 6978 SourceLocation poi = var->getLocation(); 6979 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi); 6980 ExprResult result = 6981 PerformCopyInitialization( 6982 InitializedEntity::InitializeBlock(poi, type, false), 6983 poi, Owned(varRef)); 6984 if (!result.isInvalid()) { 6985 result = MaybeCreateExprWithCleanups(result); 6986 Expr *init = result.takeAs<Expr>(); 6987 Context.setBlockVarCopyInits(var, init); 6988 } 6989 } 6990 } 6991 6992 Expr *Init = var->getInit(); 6993 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6994 6995 if (!var->getDeclContext()->isDependentContext() && Init) { 6996 if (IsGlobal && !var->isConstexpr() && 6997 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6998 var->getLocation()) 6999 != DiagnosticsEngine::Ignored && 7000 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 7001 Diag(var->getLocation(), diag::warn_global_constructor) 7002 << Init->getSourceRange(); 7003 7004 if (var->isConstexpr()) { 7005 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 7006 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 7007 SourceLocation DiagLoc = var->getLocation(); 7008 // If the note doesn't add any useful information other than a source 7009 // location, fold it into the primary diagnostic. 7010 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 7011 diag::note_invalid_subexpr_in_const_expr) { 7012 DiagLoc = Notes[0].first; 7013 Notes.clear(); 7014 } 7015 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 7016 << var << Init->getSourceRange(); 7017 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 7018 Diag(Notes[I].first, Notes[I].second); 7019 } 7020 } else if (var->isUsableInConstantExpressions(Context)) { 7021 // Check whether the initializer of a const variable of integral or 7022 // enumeration type is an ICE now, since we can't tell whether it was 7023 // initialized by a constant expression if we check later. 7024 var->checkInitIsICE(); 7025 } 7026 } 7027 7028 // Require the destructor. 7029 if (const RecordType *recordType = baseType->getAs<RecordType>()) 7030 FinalizeVarWithDestructor(var, recordType); 7031} 7032 7033/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 7034/// any semantic actions necessary after any initializer has been attached. 7035void 7036Sema::FinalizeDeclaration(Decl *ThisDecl) { 7037 // Note that we are no longer parsing the initializer for this declaration. 7038 ParsingInitForAutoVars.erase(ThisDecl); 7039 7040 // Now we have parsed the initializer and can update the table of magic 7041 // tag values. 7042 if (ThisDecl && ThisDecl->hasAttr<TypeTagForDatatypeAttr>()) { 7043 const VarDecl *VD = dyn_cast<VarDecl>(ThisDecl); 7044 if (VD && VD->getType()->isIntegralOrEnumerationType()) { 7045 for (specific_attr_iterator<TypeTagForDatatypeAttr> 7046 I = ThisDecl->specific_attr_begin<TypeTagForDatatypeAttr>(), 7047 E = ThisDecl->specific_attr_end<TypeTagForDatatypeAttr>(); 7048 I != E; ++I) { 7049 const Expr *MagicValueExpr = VD->getInit(); 7050 if (!MagicValueExpr) { 7051 continue; 7052 } 7053 llvm::APSInt MagicValueInt; 7054 if (!MagicValueExpr->isIntegerConstantExpr(MagicValueInt, Context)) { 7055 Diag(I->getRange().getBegin(), 7056 diag::err_type_tag_for_datatype_not_ice) 7057 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange(); 7058 continue; 7059 } 7060 if (MagicValueInt.getActiveBits() > 64) { 7061 Diag(I->getRange().getBegin(), 7062 diag::err_type_tag_for_datatype_too_large) 7063 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange(); 7064 continue; 7065 } 7066 uint64_t MagicValue = MagicValueInt.getZExtValue(); 7067 RegisterTypeTagForDatatype(I->getArgumentKind(), 7068 MagicValue, 7069 I->getMatchingCType(), 7070 I->getLayoutCompatible(), 7071 I->getMustBeNull()); 7072 } 7073 } 7074 } 7075} 7076 7077Sema::DeclGroupPtrTy 7078Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 7079 Decl **Group, unsigned NumDecls) { 7080 SmallVector<Decl*, 8> Decls; 7081 7082 if (DS.isTypeSpecOwned()) 7083 Decls.push_back(DS.getRepAsDecl()); 7084 7085 for (unsigned i = 0; i != NumDecls; ++i) 7086 if (Decl *D = Group[i]) 7087 Decls.push_back(D); 7088 7089 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 7090 DS.getTypeSpecType() == DeclSpec::TST_auto); 7091} 7092 7093/// BuildDeclaratorGroup - convert a list of declarations into a declaration 7094/// group, performing any necessary semantic checking. 7095Sema::DeclGroupPtrTy 7096Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 7097 bool TypeMayContainAuto) { 7098 // C++0x [dcl.spec.auto]p7: 7099 // If the type deduced for the template parameter U is not the same in each 7100 // deduction, the program is ill-formed. 7101 // FIXME: When initializer-list support is added, a distinction is needed 7102 // between the deduced type U and the deduced type which 'auto' stands for. 7103 // auto a = 0, b = { 1, 2, 3 }; 7104 // is legal because the deduced type U is 'int' in both cases. 7105 if (TypeMayContainAuto && NumDecls > 1) { 7106 QualType Deduced; 7107 CanQualType DeducedCanon; 7108 VarDecl *DeducedDecl = 0; 7109 for (unsigned i = 0; i != NumDecls; ++i) { 7110 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 7111 AutoType *AT = D->getType()->getContainedAutoType(); 7112 // Don't reissue diagnostics when instantiating a template. 7113 if (AT && D->isInvalidDecl()) 7114 break; 7115 if (AT && AT->isDeduced()) { 7116 QualType U = AT->getDeducedType(); 7117 CanQualType UCanon = Context.getCanonicalType(U); 7118 if (Deduced.isNull()) { 7119 Deduced = U; 7120 DeducedCanon = UCanon; 7121 DeducedDecl = D; 7122 } else if (DeducedCanon != UCanon) { 7123 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 7124 diag::err_auto_different_deductions) 7125 << Deduced << DeducedDecl->getDeclName() 7126 << U << D->getDeclName() 7127 << DeducedDecl->getInit()->getSourceRange() 7128 << D->getInit()->getSourceRange(); 7129 D->setInvalidDecl(); 7130 break; 7131 } 7132 } 7133 } 7134 } 7135 } 7136 7137 ActOnDocumentableDecls(Group, NumDecls); 7138 7139 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 7140} 7141 7142void Sema::ActOnDocumentableDecl(Decl *D) { 7143 ActOnDocumentableDecls(&D, 1); 7144} 7145 7146void Sema::ActOnDocumentableDecls(Decl **Group, unsigned NumDecls) { 7147 // Don't parse the comment if Doxygen diagnostics are ignored. 7148 if (NumDecls == 0 || !Group[0]) 7149 return; 7150 7151 if (Diags.getDiagnosticLevel(diag::warn_doc_param_not_found, 7152 Group[0]->getLocation()) 7153 == DiagnosticsEngine::Ignored) 7154 return; 7155 7156 if (NumDecls >= 2) { 7157 // This is a decl group. Normally it will contain only declarations 7158 // procuded from declarator list. But in case we have any definitions or 7159 // additional declaration references: 7160 // 'typedef struct S {} S;' 7161 // 'typedef struct S *S;' 7162 // 'struct S *pS;' 7163 // FinalizeDeclaratorGroup adds these as separate declarations. 7164 Decl *MaybeTagDecl = Group[0]; 7165 if (MaybeTagDecl && isa<TagDecl>(MaybeTagDecl)) { 7166 Group++; 7167 NumDecls--; 7168 } 7169 } 7170 7171 // See if there are any new comments that are not attached to a decl. 7172 ArrayRef<RawComment *> Comments = Context.getRawCommentList().getComments(); 7173 if (!Comments.empty() && 7174 !Comments.back()->isAttached()) { 7175 // There is at least one comment that not attached to a decl. 7176 // Maybe it should be attached to one of these decls? 7177 // 7178 // Note that this way we pick up not only comments that precede the 7179 // declaration, but also comments that *follow* the declaration -- thanks to 7180 // the lookahead in the lexer: we've consumed the semicolon and looked 7181 // ahead through comments. 7182 for (unsigned i = 0; i != NumDecls; ++i) 7183 Context.getCommentForDecl(Group[i]); 7184 } 7185} 7186 7187/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 7188/// to introduce parameters into function prototype scope. 7189Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 7190 const DeclSpec &DS = D.getDeclSpec(); 7191 7192 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 7193 // C++03 [dcl.stc]p2 also permits 'auto'. 7194 VarDecl::StorageClass StorageClass = SC_None; 7195 VarDecl::StorageClass StorageClassAsWritten = SC_None; 7196 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 7197 StorageClass = SC_Register; 7198 StorageClassAsWritten = SC_Register; 7199 } else if (getLangOpts().CPlusPlus && 7200 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 7201 StorageClass = SC_Auto; 7202 StorageClassAsWritten = SC_Auto; 7203 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 7204 Diag(DS.getStorageClassSpecLoc(), 7205 diag::err_invalid_storage_class_in_func_decl); 7206 D.getMutableDeclSpec().ClearStorageClassSpecs(); 7207 } 7208 7209 if (D.getDeclSpec().isThreadSpecified()) 7210 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7211 if (D.getDeclSpec().isConstexprSpecified()) 7212 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 7213 << 0; 7214 7215 DiagnoseFunctionSpecifiers(D); 7216 7217 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7218 QualType parmDeclType = TInfo->getType(); 7219 7220 if (getLangOpts().CPlusPlus) { 7221 // Check that there are no default arguments inside the type of this 7222 // parameter. 7223 CheckExtraCXXDefaultArguments(D); 7224 7225 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 7226 if (D.getCXXScopeSpec().isSet()) { 7227 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 7228 << D.getCXXScopeSpec().getRange(); 7229 D.getCXXScopeSpec().clear(); 7230 } 7231 } 7232 7233 // Ensure we have a valid name 7234 IdentifierInfo *II = 0; 7235 if (D.hasName()) { 7236 II = D.getIdentifier(); 7237 if (!II) { 7238 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 7239 << GetNameForDeclarator(D).getName().getAsString(); 7240 D.setInvalidType(true); 7241 } 7242 } 7243 7244 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 7245 if (II) { 7246 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 7247 ForRedeclaration); 7248 LookupName(R, S); 7249 if (R.isSingleResult()) { 7250 NamedDecl *PrevDecl = R.getFoundDecl(); 7251 if (PrevDecl->isTemplateParameter()) { 7252 // Maybe we will complain about the shadowed template parameter. 7253 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7254 // Just pretend that we didn't see the previous declaration. 7255 PrevDecl = 0; 7256 } else if (S->isDeclScope(PrevDecl)) { 7257 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 7258 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7259 7260 // Recover by removing the name 7261 II = 0; 7262 D.SetIdentifier(0, D.getIdentifierLoc()); 7263 D.setInvalidType(true); 7264 } 7265 } 7266 } 7267 7268 // Temporarily put parameter variables in the translation unit, not 7269 // the enclosing context. This prevents them from accidentally 7270 // looking like class members in C++. 7271 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 7272 D.getLocStart(), 7273 D.getIdentifierLoc(), II, 7274 parmDeclType, TInfo, 7275 StorageClass, StorageClassAsWritten); 7276 7277 if (D.isInvalidType()) 7278 New->setInvalidDecl(); 7279 7280 assert(S->isFunctionPrototypeScope()); 7281 assert(S->getFunctionPrototypeDepth() >= 1); 7282 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 7283 S->getNextFunctionPrototypeIndex()); 7284 7285 // Add the parameter declaration into this scope. 7286 S->AddDecl(New); 7287 if (II) 7288 IdResolver.AddDecl(New); 7289 7290 ProcessDeclAttributes(S, New, D); 7291 7292 if (D.getDeclSpec().isModulePrivateSpecified()) 7293 Diag(New->getLocation(), diag::err_module_private_local) 7294 << 1 << New->getDeclName() 7295 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7296 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7297 7298 if (New->hasAttr<BlocksAttr>()) { 7299 Diag(New->getLocation(), diag::err_block_on_nonlocal); 7300 } 7301 return New; 7302} 7303 7304/// \brief Synthesizes a variable for a parameter arising from a 7305/// typedef. 7306ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 7307 SourceLocation Loc, 7308 QualType T) { 7309 /* FIXME: setting StartLoc == Loc. 7310 Would it be worth to modify callers so as to provide proper source 7311 location for the unnamed parameters, embedding the parameter's type? */ 7312 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 7313 T, Context.getTrivialTypeSourceInfo(T, Loc), 7314 SC_None, SC_None, 0); 7315 Param->setImplicit(); 7316 return Param; 7317} 7318 7319void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 7320 ParmVarDecl * const *ParamEnd) { 7321 // Don't diagnose unused-parameter errors in template instantiations; we 7322 // will already have done so in the template itself. 7323 if (!ActiveTemplateInstantiations.empty()) 7324 return; 7325 7326 for (; Param != ParamEnd; ++Param) { 7327 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 7328 !(*Param)->hasAttr<UnusedAttr>()) { 7329 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 7330 << (*Param)->getDeclName(); 7331 } 7332 } 7333} 7334 7335void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 7336 ParmVarDecl * const *ParamEnd, 7337 QualType ReturnTy, 7338 NamedDecl *D) { 7339 if (LangOpts.NumLargeByValueCopy == 0) // No check. 7340 return; 7341 7342 // Warn if the return value is pass-by-value and larger than the specified 7343 // threshold. 7344 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 7345 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 7346 if (Size > LangOpts.NumLargeByValueCopy) 7347 Diag(D->getLocation(), diag::warn_return_value_size) 7348 << D->getDeclName() << Size; 7349 } 7350 7351 // Warn if any parameter is pass-by-value and larger than the specified 7352 // threshold. 7353 for (; Param != ParamEnd; ++Param) { 7354 QualType T = (*Param)->getType(); 7355 if (T->isDependentType() || !T.isPODType(Context)) 7356 continue; 7357 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 7358 if (Size > LangOpts.NumLargeByValueCopy) 7359 Diag((*Param)->getLocation(), diag::warn_parameter_size) 7360 << (*Param)->getDeclName() << Size; 7361 } 7362} 7363 7364ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 7365 SourceLocation NameLoc, IdentifierInfo *Name, 7366 QualType T, TypeSourceInfo *TSInfo, 7367 VarDecl::StorageClass StorageClass, 7368 VarDecl::StorageClass StorageClassAsWritten) { 7369 // In ARC, infer a lifetime qualifier for appropriate parameter types. 7370 if (getLangOpts().ObjCAutoRefCount && 7371 T.getObjCLifetime() == Qualifiers::OCL_None && 7372 T->isObjCLifetimeType()) { 7373 7374 Qualifiers::ObjCLifetime lifetime; 7375 7376 // Special cases for arrays: 7377 // - if it's const, use __unsafe_unretained 7378 // - otherwise, it's an error 7379 if (T->isArrayType()) { 7380 if (!T.isConstQualified()) { 7381 DelayedDiagnostics.add( 7382 sema::DelayedDiagnostic::makeForbiddenType( 7383 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 7384 } 7385 lifetime = Qualifiers::OCL_ExplicitNone; 7386 } else { 7387 lifetime = T->getObjCARCImplicitLifetime(); 7388 } 7389 T = Context.getLifetimeQualifiedType(T, lifetime); 7390 } 7391 7392 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 7393 Context.getAdjustedParameterType(T), 7394 TSInfo, 7395 StorageClass, StorageClassAsWritten, 7396 0); 7397 7398 // Parameters can not be abstract class types. 7399 // For record types, this is done by the AbstractClassUsageDiagnoser once 7400 // the class has been completely parsed. 7401 if (!CurContext->isRecord() && 7402 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 7403 AbstractParamType)) 7404 New->setInvalidDecl(); 7405 7406 // Parameter declarators cannot be interface types. All ObjC objects are 7407 // passed by reference. 7408 if (T->isObjCObjectType()) { 7409 SourceLocation TypeEndLoc = TSInfo->getTypeLoc().getLocEnd(); 7410 Diag(NameLoc, 7411 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 7412 << FixItHint::CreateInsertion(TypeEndLoc, "*"); 7413 T = Context.getObjCObjectPointerType(T); 7414 New->setType(T); 7415 } 7416 7417 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 7418 // duration shall not be qualified by an address-space qualifier." 7419 // Since all parameters have automatic store duration, they can not have 7420 // an address space. 7421 if (T.getAddressSpace() != 0) { 7422 Diag(NameLoc, diag::err_arg_with_address_space); 7423 New->setInvalidDecl(); 7424 } 7425 7426 return New; 7427} 7428 7429void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 7430 SourceLocation LocAfterDecls) { 7431 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 7432 7433 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 7434 // for a K&R function. 7435 if (!FTI.hasPrototype) { 7436 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 7437 --i; 7438 if (FTI.ArgInfo[i].Param == 0) { 7439 SmallString<256> Code; 7440 llvm::raw_svector_ostream(Code) << " int " 7441 << FTI.ArgInfo[i].Ident->getName() 7442 << ";\n"; 7443 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 7444 << FTI.ArgInfo[i].Ident 7445 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 7446 7447 // Implicitly declare the argument as type 'int' for lack of a better 7448 // type. 7449 AttributeFactory attrs; 7450 DeclSpec DS(attrs); 7451 const char* PrevSpec; // unused 7452 unsigned DiagID; // unused 7453 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 7454 PrevSpec, DiagID); 7455 Declarator ParamD(DS, Declarator::KNRTypeListContext); 7456 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 7457 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 7458 } 7459 } 7460 } 7461} 7462 7463Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 7464 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 7465 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 7466 Scope *ParentScope = FnBodyScope->getParent(); 7467 7468 D.setFunctionDefinitionKind(FDK_Definition); 7469 Decl *DP = HandleDeclarator(ParentScope, D, 7470 MultiTemplateParamsArg(*this)); 7471 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7472} 7473 7474static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7475 // Don't warn about invalid declarations. 7476 if (FD->isInvalidDecl()) 7477 return false; 7478 7479 // Or declarations that aren't global. 7480 if (!FD->isGlobal()) 7481 return false; 7482 7483 // Don't warn about C++ member functions. 7484 if (isa<CXXMethodDecl>(FD)) 7485 return false; 7486 7487 // Don't warn about 'main'. 7488 if (FD->isMain()) 7489 return false; 7490 7491 // Don't warn about inline functions. 7492 if (FD->isInlined()) 7493 return false; 7494 7495 // Don't warn about function templates. 7496 if (FD->getDescribedFunctionTemplate()) 7497 return false; 7498 7499 // Don't warn about function template specializations. 7500 if (FD->isFunctionTemplateSpecialization()) 7501 return false; 7502 7503 // Don't warn for OpenCL kernels. 7504 if (FD->hasAttr<OpenCLKernelAttr>()) 7505 return false; 7506 7507 bool MissingPrototype = true; 7508 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7509 Prev; Prev = Prev->getPreviousDecl()) { 7510 // Ignore any declarations that occur in function or method 7511 // scope, because they aren't visible from the header. 7512 if (Prev->getDeclContext()->isFunctionOrMethod()) 7513 continue; 7514 7515 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7516 break; 7517 } 7518 7519 return MissingPrototype; 7520} 7521 7522void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7523 // Don't complain if we're in GNU89 mode and the previous definition 7524 // was an extern inline function. 7525 const FunctionDecl *Definition; 7526 if (FD->isDefined(Definition) && 7527 !canRedefineFunction(Definition, getLangOpts())) { 7528 if (getLangOpts().GNUMode && Definition->isInlineSpecified() && 7529 Definition->getStorageClass() == SC_Extern) 7530 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7531 << FD->getDeclName() << getLangOpts().CPlusPlus; 7532 else 7533 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7534 Diag(Definition->getLocation(), diag::note_previous_definition); 7535 FD->setInvalidDecl(); 7536 } 7537} 7538 7539Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7540 // Clear the last template instantiation error context. 7541 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7542 7543 if (!D) 7544 return D; 7545 FunctionDecl *FD = 0; 7546 7547 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7548 FD = FunTmpl->getTemplatedDecl(); 7549 else 7550 FD = cast<FunctionDecl>(D); 7551 7552 // Enter a new function scope 7553 PushFunctionScope(); 7554 7555 // See if this is a redefinition. 7556 if (!FD->isLateTemplateParsed()) 7557 CheckForFunctionRedefinition(FD); 7558 7559 // Builtin functions cannot be defined. 7560 if (unsigned BuiltinID = FD->getBuiltinID()) { 7561 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7562 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7563 FD->setInvalidDecl(); 7564 } 7565 } 7566 7567 // The return type of a function definition must be complete 7568 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7569 QualType ResultType = FD->getResultType(); 7570 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7571 !FD->isInvalidDecl() && 7572 RequireCompleteType(FD->getLocation(), ResultType, 7573 diag::err_func_def_incomplete_result)) 7574 FD->setInvalidDecl(); 7575 7576 // GNU warning -Wmissing-prototypes: 7577 // Warn if a global function is defined without a previous 7578 // prototype declaration. This warning is issued even if the 7579 // definition itself provides a prototype. The aim is to detect 7580 // global functions that fail to be declared in header files. 7581 if (ShouldWarnAboutMissingPrototype(FD)) 7582 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7583 7584 if (FnBodyScope) 7585 PushDeclContext(FnBodyScope, FD); 7586 7587 // Check the validity of our function parameters 7588 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7589 /*CheckParameterNames=*/true); 7590 7591 // Introduce our parameters into the function scope 7592 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7593 ParmVarDecl *Param = FD->getParamDecl(p); 7594 Param->setOwningFunction(FD); 7595 7596 // If this has an identifier, add it to the scope stack. 7597 if (Param->getIdentifier() && FnBodyScope) { 7598 CheckShadow(FnBodyScope, Param); 7599 7600 PushOnScopeChains(Param, FnBodyScope); 7601 } 7602 } 7603 7604 // If we had any tags defined in the function prototype, 7605 // introduce them into the function scope. 7606 if (FnBodyScope) { 7607 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(), 7608 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) { 7609 NamedDecl *D = *I; 7610 7611 // Some of these decls (like enums) may have been pinned to the translation unit 7612 // for lack of a real context earlier. If so, remove from the translation unit 7613 // and reattach to the current context. 7614 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) { 7615 // Is the decl actually in the context? 7616 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(), 7617 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) { 7618 if (*DI == D) { 7619 Context.getTranslationUnitDecl()->removeDecl(D); 7620 break; 7621 } 7622 } 7623 // Either way, reassign the lexical decl context to our FunctionDecl. 7624 D->setLexicalDeclContext(CurContext); 7625 } 7626 7627 // If the decl has a non-null name, make accessible in the current scope. 7628 if (!D->getName().empty()) 7629 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false); 7630 7631 // Similarly, dive into enums and fish their constants out, making them 7632 // accessible in this scope. 7633 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) { 7634 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(), 7635 EE = ED->enumerator_end(); EI != EE; ++EI) 7636 PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false); 7637 } 7638 } 7639 } 7640 7641 // Ensure that the function's exception specification is instantiated. 7642 if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>()) 7643 ResolveExceptionSpec(D->getLocation(), FPT); 7644 7645 // Checking attributes of current function definition 7646 // dllimport attribute. 7647 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7648 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7649 // dllimport attribute cannot be directly applied to definition. 7650 // Microsoft accepts dllimport for functions defined within class scope. 7651 if (!DA->isInherited() && 7652 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7653 Diag(FD->getLocation(), 7654 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7655 << "dllimport"; 7656 FD->setInvalidDecl(); 7657 return FD; 7658 } 7659 7660 // Visual C++ appears to not think this is an issue, so only issue 7661 // a warning when Microsoft extensions are disabled. 7662 if (!LangOpts.MicrosoftExt) { 7663 // If a symbol previously declared dllimport is later defined, the 7664 // attribute is ignored in subsequent references, and a warning is 7665 // emitted. 7666 Diag(FD->getLocation(), 7667 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7668 << FD->getName() << "dllimport"; 7669 } 7670 } 7671 // We want to attach documentation to original Decl (which might be 7672 // a function template). 7673 ActOnDocumentableDecl(D); 7674 return FD; 7675} 7676 7677/// \brief Given the set of return statements within a function body, 7678/// compute the variables that are subject to the named return value 7679/// optimization. 7680/// 7681/// Each of the variables that is subject to the named return value 7682/// optimization will be marked as NRVO variables in the AST, and any 7683/// return statement that has a marked NRVO variable as its NRVO candidate can 7684/// use the named return value optimization. 7685/// 7686/// This function applies a very simplistic algorithm for NRVO: if every return 7687/// statement in the function has the same NRVO candidate, that candidate is 7688/// the NRVO variable. 7689/// 7690/// FIXME: Employ a smarter algorithm that accounts for multiple return 7691/// statements and the lifetimes of the NRVO candidates. We should be able to 7692/// find a maximal set of NRVO variables. 7693void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7694 ReturnStmt **Returns = Scope->Returns.data(); 7695 7696 const VarDecl *NRVOCandidate = 0; 7697 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7698 if (!Returns[I]->getNRVOCandidate()) 7699 return; 7700 7701 if (!NRVOCandidate) 7702 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7703 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7704 return; 7705 } 7706 7707 if (NRVOCandidate) 7708 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7709} 7710 7711Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7712 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7713} 7714 7715Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7716 bool IsInstantiation) { 7717 FunctionDecl *FD = 0; 7718 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7719 if (FunTmpl) 7720 FD = FunTmpl->getTemplatedDecl(); 7721 else 7722 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7723 7724 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7725 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7726 7727 if (FD) { 7728 FD->setBody(Body); 7729 7730 // If the function implicitly returns zero (like 'main') or is naked, 7731 // don't complain about missing return statements. 7732 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) 7733 WP.disableCheckFallThrough(); 7734 7735 // MSVC permits the use of pure specifier (=0) on function definition, 7736 // defined at class scope, warn about this non standard construct. 7737 if (getLangOpts().MicrosoftExt && FD->isPure()) 7738 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7739 7740 if (!FD->isInvalidDecl()) { 7741 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7742 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7743 FD->getResultType(), FD); 7744 7745 // If this is a constructor, we need a vtable. 7746 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7747 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7748 7749 // Try to apply the named return value optimization. We have to check 7750 // if we can do this here because lambdas keep return statements around 7751 // to deduce an implicit return type. 7752 if (getLangOpts().CPlusPlus && FD->getResultType()->isRecordType() && 7753 !FD->isDependentContext()) 7754 computeNRVO(Body, getCurFunction()); 7755 } 7756 7757 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 7758 "Function parsing confused"); 7759 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7760 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7761 MD->setBody(Body); 7762 if (!MD->isInvalidDecl()) { 7763 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7764 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7765 MD->getResultType(), MD); 7766 7767 if (Body) 7768 computeNRVO(Body, getCurFunction()); 7769 } 7770 if (getCurFunction()->ObjCShouldCallSuperDealloc) { 7771 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7772 getCurFunction()->ObjCShouldCallSuperDealloc = false; 7773 } 7774 if (getCurFunction()->ObjCShouldCallSuperFinalize) { 7775 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7776 getCurFunction()->ObjCShouldCallSuperFinalize = false; 7777 } 7778 } else { 7779 return 0; 7780 } 7781 7782 assert(!getCurFunction()->ObjCShouldCallSuperDealloc && 7783 "This should only be set for ObjC methods, which should have been " 7784 "handled in the block above."); 7785 assert(!getCurFunction()->ObjCShouldCallSuperFinalize && 7786 "This should only be set for ObjC methods, which should have been " 7787 "handled in the block above."); 7788 7789 // Verify and clean out per-function state. 7790 if (Body) { 7791 // C++ constructors that have function-try-blocks can't have return 7792 // statements in the handlers of that block. (C++ [except.handle]p14) 7793 // Verify this. 7794 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7795 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7796 7797 // Verify that gotos and switch cases don't jump into scopes illegally. 7798 if (getCurFunction()->NeedsScopeChecking() && 7799 !dcl->isInvalidDecl() && 7800 !hasAnyUnrecoverableErrorsInThisFunction() && 7801 !PP.isCodeCompletionEnabled()) 7802 DiagnoseInvalidJumps(Body); 7803 7804 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7805 if (!Destructor->getParent()->isDependentType()) 7806 CheckDestructor(Destructor); 7807 7808 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7809 Destructor->getParent()); 7810 } 7811 7812 // If any errors have occurred, clear out any temporaries that may have 7813 // been leftover. This ensures that these temporaries won't be picked up for 7814 // deletion in some later function. 7815 if (PP.getDiagnostics().hasErrorOccurred() || 7816 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7817 DiscardCleanupsInEvaluationContext(); 7818 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7819 // Since the body is valid, issue any analysis-based warnings that are 7820 // enabled. 7821 ActivePolicy = &WP; 7822 } 7823 7824 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7825 (!CheckConstexprFunctionDecl(FD) || 7826 !CheckConstexprFunctionBody(FD, Body))) 7827 FD->setInvalidDecl(); 7828 7829 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7830 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7831 assert(MaybeODRUseExprs.empty() && 7832 "Leftover expressions for odr-use checking"); 7833 } 7834 7835 if (!IsInstantiation) 7836 PopDeclContext(); 7837 7838 PopFunctionScopeInfo(ActivePolicy, dcl); 7839 7840 // If any errors have occurred, clear out any temporaries that may have 7841 // been leftover. This ensures that these temporaries won't be picked up for 7842 // deletion in some later function. 7843 if (getDiagnostics().hasErrorOccurred()) { 7844 DiscardCleanupsInEvaluationContext(); 7845 } 7846 7847 return dcl; 7848} 7849 7850 7851/// When we finish delayed parsing of an attribute, we must attach it to the 7852/// relevant Decl. 7853void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7854 ParsedAttributes &Attrs) { 7855 // Always attach attributes to the underlying decl. 7856 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7857 D = TD->getTemplatedDecl(); 7858 ProcessDeclAttributeList(S, D, Attrs.getList()); 7859 7860 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D)) 7861 if (Method->isStatic()) 7862 checkThisInStaticMemberFunctionAttributes(Method); 7863} 7864 7865 7866/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7867/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7868NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7869 IdentifierInfo &II, Scope *S) { 7870 // Before we produce a declaration for an implicitly defined 7871 // function, see whether there was a locally-scoped declaration of 7872 // this name as a function or variable. If so, use that 7873 // (non-visible) declaration, and complain about it. 7874 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7875 = findLocallyScopedExternalDecl(&II); 7876 if (Pos != LocallyScopedExternalDecls.end()) { 7877 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7878 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7879 return Pos->second; 7880 } 7881 7882 // Extension in C99. Legal in C90, but warn about it. 7883 unsigned diag_id; 7884 if (II.getName().startswith("__builtin_")) 7885 diag_id = diag::warn_builtin_unknown; 7886 else if (getLangOpts().C99) 7887 diag_id = diag::ext_implicit_function_decl; 7888 else 7889 diag_id = diag::warn_implicit_function_decl; 7890 Diag(Loc, diag_id) << &II; 7891 7892 // Because typo correction is expensive, only do it if the implicit 7893 // function declaration is going to be treated as an error. 7894 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7895 TypoCorrection Corrected; 7896 DeclFilterCCC<FunctionDecl> Validator; 7897 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7898 LookupOrdinaryName, S, 0, Validator))) { 7899 std::string CorrectedStr = Corrected.getAsString(getLangOpts()); 7900 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts()); 7901 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7902 7903 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7904 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7905 7906 if (Func->getLocation().isValid() 7907 && !II.getName().startswith("__builtin_")) 7908 Diag(Func->getLocation(), diag::note_previous_decl) 7909 << CorrectedQuotedStr; 7910 } 7911 } 7912 7913 // Set a Declarator for the implicit definition: int foo(); 7914 const char *Dummy; 7915 AttributeFactory attrFactory; 7916 DeclSpec DS(attrFactory); 7917 unsigned DiagID; 7918 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7919 (void)Error; // Silence warning. 7920 assert(!Error && "Error setting up implicit decl!"); 7921 Declarator D(DS, Declarator::BlockContext); 7922 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, false, 7923 SourceLocation(), 0, 0, 0, true, 7924 SourceLocation(), SourceLocation(), 7925 SourceLocation(), SourceLocation(), 7926 EST_None, SourceLocation(), 7927 0, 0, 0, 0, Loc, Loc, D), 7928 DS.getAttributes(), 7929 SourceLocation()); 7930 D.SetIdentifier(&II, Loc); 7931 7932 // Insert this function into translation-unit scope. 7933 7934 DeclContext *PrevDC = CurContext; 7935 CurContext = Context.getTranslationUnitDecl(); 7936 7937 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7938 FD->setImplicit(); 7939 7940 CurContext = PrevDC; 7941 7942 AddKnownFunctionAttributes(FD); 7943 7944 return FD; 7945} 7946 7947/// \brief Adds any function attributes that we know a priori based on 7948/// the declaration of this function. 7949/// 7950/// These attributes can apply both to implicitly-declared builtins 7951/// (like __builtin___printf_chk) or to library-declared functions 7952/// like NSLog or printf. 7953/// 7954/// We need to check for duplicate attributes both here and where user-written 7955/// attributes are applied to declarations. 7956void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7957 if (FD->isInvalidDecl()) 7958 return; 7959 7960 // If this is a built-in function, map its builtin attributes to 7961 // actual attributes. 7962 if (unsigned BuiltinID = FD->getBuiltinID()) { 7963 // Handle printf-formatting attributes. 7964 unsigned FormatIdx; 7965 bool HasVAListArg; 7966 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7967 if (!FD->getAttr<FormatAttr>()) { 7968 const char *fmt = "printf"; 7969 unsigned int NumParams = FD->getNumParams(); 7970 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7971 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7972 fmt = "NSString"; 7973 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7974 fmt, FormatIdx+1, 7975 HasVAListArg ? 0 : FormatIdx+2)); 7976 } 7977 } 7978 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7979 HasVAListArg)) { 7980 if (!FD->getAttr<FormatAttr>()) 7981 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7982 "scanf", FormatIdx+1, 7983 HasVAListArg ? 0 : FormatIdx+2)); 7984 } 7985 7986 // Mark const if we don't care about errno and that is the only 7987 // thing preventing the function from being const. This allows 7988 // IRgen to use LLVM intrinsics for such functions. 7989 if (!getLangOpts().MathErrno && 7990 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7991 if (!FD->getAttr<ConstAttr>()) 7992 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7993 } 7994 7995 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7996 !FD->getAttr<ReturnsTwiceAttr>()) 7997 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7998 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7999 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 8000 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 8001 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 8002 } 8003 8004 IdentifierInfo *Name = FD->getIdentifier(); 8005 if (!Name) 8006 return; 8007 if ((!getLangOpts().CPlusPlus && 8008 FD->getDeclContext()->isTranslationUnit()) || 8009 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 8010 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 8011 LinkageSpecDecl::lang_c)) { 8012 // Okay: this could be a libc/libm/Objective-C function we know 8013 // about. 8014 } else 8015 return; 8016 8017 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 8018 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 8019 // target-specific builtins, perhaps? 8020 if (!FD->getAttr<FormatAttr>()) 8021 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 8022 "printf", 2, 8023 Name->isStr("vasprintf") ? 0 : 3)); 8024 } 8025 8026 if (Name->isStr("__CFStringMakeConstantString")) { 8027 // We already have a __builtin___CFStringMakeConstantString, 8028 // but builds that use -fno-constant-cfstrings don't go through that. 8029 if (!FD->getAttr<FormatArgAttr>()) 8030 FD->addAttr(::new (Context) FormatArgAttr(FD->getLocation(), Context, 1)); 8031 } 8032} 8033 8034TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 8035 TypeSourceInfo *TInfo) { 8036 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 8037 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 8038 8039 if (!TInfo) { 8040 assert(D.isInvalidType() && "no declarator info for valid type"); 8041 TInfo = Context.getTrivialTypeSourceInfo(T); 8042 } 8043 8044 // Scope manipulation handled by caller. 8045 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 8046 D.getLocStart(), 8047 D.getIdentifierLoc(), 8048 D.getIdentifier(), 8049 TInfo); 8050 8051 // Bail out immediately if we have an invalid declaration. 8052 if (D.isInvalidType()) { 8053 NewTD->setInvalidDecl(); 8054 return NewTD; 8055 } 8056 8057 if (D.getDeclSpec().isModulePrivateSpecified()) { 8058 if (CurContext->isFunctionOrMethod()) 8059 Diag(NewTD->getLocation(), diag::err_module_private_local) 8060 << 2 << NewTD->getDeclName() 8061 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 8062 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 8063 else 8064 NewTD->setModulePrivate(); 8065 } 8066 8067 // C++ [dcl.typedef]p8: 8068 // If the typedef declaration defines an unnamed class (or 8069 // enum), the first typedef-name declared by the declaration 8070 // to be that class type (or enum type) is used to denote the 8071 // class type (or enum type) for linkage purposes only. 8072 // We need to check whether the type was declared in the declaration. 8073 switch (D.getDeclSpec().getTypeSpecType()) { 8074 case TST_enum: 8075 case TST_struct: 8076 case TST_union: 8077 case TST_class: { 8078 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 8079 8080 // Do nothing if the tag is not anonymous or already has an 8081 // associated typedef (from an earlier typedef in this decl group). 8082 if (tagFromDeclSpec->getIdentifier()) break; 8083 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 8084 8085 // A well-formed anonymous tag must always be a TUK_Definition. 8086 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 8087 8088 // The type must match the tag exactly; no qualifiers allowed. 8089 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 8090 break; 8091 8092 // Otherwise, set this is the anon-decl typedef for the tag. 8093 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 8094 break; 8095 } 8096 8097 default: 8098 break; 8099 } 8100 8101 return NewTD; 8102} 8103 8104 8105/// \brief Check that this is a valid underlying type for an enum declaration. 8106bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) { 8107 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 8108 QualType T = TI->getType(); 8109 8110 if (T->isDependentType() || T->isIntegralType(Context)) 8111 return false; 8112 8113 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T; 8114 return true; 8115} 8116 8117/// Check whether this is a valid redeclaration of a previous enumeration. 8118/// \return true if the redeclaration was invalid. 8119bool Sema::CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped, 8120 QualType EnumUnderlyingTy, 8121 const EnumDecl *Prev) { 8122 bool IsFixed = !EnumUnderlyingTy.isNull(); 8123 8124 if (IsScoped != Prev->isScoped()) { 8125 Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch) 8126 << Prev->isScoped(); 8127 Diag(Prev->getLocation(), diag::note_previous_use); 8128 return true; 8129 } 8130 8131 if (IsFixed && Prev->isFixed()) { 8132 if (!EnumUnderlyingTy->isDependentType() && 8133 !Prev->getIntegerType()->isDependentType() && 8134 !Context.hasSameUnqualifiedType(EnumUnderlyingTy, 8135 Prev->getIntegerType())) { 8136 Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch) 8137 << EnumUnderlyingTy << Prev->getIntegerType(); 8138 Diag(Prev->getLocation(), diag::note_previous_use); 8139 return true; 8140 } 8141 } else if (IsFixed != Prev->isFixed()) { 8142 Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch) 8143 << Prev->isFixed(); 8144 Diag(Prev->getLocation(), diag::note_previous_use); 8145 return true; 8146 } 8147 8148 return false; 8149} 8150 8151/// \brief Determine whether a tag with a given kind is acceptable 8152/// as a redeclaration of the given tag declaration. 8153/// 8154/// \returns true if the new tag kind is acceptable, false otherwise. 8155bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 8156 TagTypeKind NewTag, bool isDefinition, 8157 SourceLocation NewTagLoc, 8158 const IdentifierInfo &Name) { 8159 // C++ [dcl.type.elab]p3: 8160 // The class-key or enum keyword present in the 8161 // elaborated-type-specifier shall agree in kind with the 8162 // declaration to which the name in the elaborated-type-specifier 8163 // refers. This rule also applies to the form of 8164 // elaborated-type-specifier that declares a class-name or 8165 // friend class since it can be construed as referring to the 8166 // definition of the class. Thus, in any 8167 // elaborated-type-specifier, the enum keyword shall be used to 8168 // refer to an enumeration (7.2), the union class-key shall be 8169 // used to refer to a union (clause 9), and either the class or 8170 // struct class-key shall be used to refer to a class (clause 9) 8171 // declared using the class or struct class-key. 8172 TagTypeKind OldTag = Previous->getTagKind(); 8173 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 8174 if (OldTag == NewTag) 8175 return true; 8176 8177 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 8178 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 8179 // Warn about the struct/class tag mismatch. 8180 bool isTemplate = false; 8181 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 8182 isTemplate = Record->getDescribedClassTemplate(); 8183 8184 if (!ActiveTemplateInstantiations.empty()) { 8185 // In a template instantiation, do not offer fix-its for tag mismatches 8186 // since they usually mess up the template instead of fixing the problem. 8187 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 8188 << (NewTag == TTK_Class) << isTemplate << &Name; 8189 return true; 8190 } 8191 8192 if (isDefinition) { 8193 // On definitions, check previous tags and issue a fix-it for each 8194 // one that doesn't match the current tag. 8195 if (Previous->getDefinition()) { 8196 // Don't suggest fix-its for redefinitions. 8197 return true; 8198 } 8199 8200 bool previousMismatch = false; 8201 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 8202 E(Previous->redecls_end()); I != E; ++I) { 8203 if (I->getTagKind() != NewTag) { 8204 if (!previousMismatch) { 8205 previousMismatch = true; 8206 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 8207 << (NewTag == TTK_Class) << isTemplate << &Name; 8208 } 8209 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 8210 << (NewTag == TTK_Class) 8211 << FixItHint::CreateReplacement(I->getInnerLocStart(), 8212 NewTag == TTK_Class? 8213 "class" : "struct"); 8214 } 8215 } 8216 return true; 8217 } 8218 8219 // Check for a previous definition. If current tag and definition 8220 // are same type, do nothing. If no definition, but disagree with 8221 // with previous tag type, give a warning, but no fix-it. 8222 const TagDecl *Redecl = Previous->getDefinition() ? 8223 Previous->getDefinition() : Previous; 8224 if (Redecl->getTagKind() == NewTag) { 8225 return true; 8226 } 8227 8228 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 8229 << (NewTag == TTK_Class) 8230 << isTemplate << &Name; 8231 Diag(Redecl->getLocation(), diag::note_previous_use); 8232 8233 // If there is a previous defintion, suggest a fix-it. 8234 if (Previous->getDefinition()) { 8235 Diag(NewTagLoc, diag::note_struct_class_suggestion) 8236 << (Redecl->getTagKind() == TTK_Class) 8237 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 8238 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 8239 } 8240 8241 return true; 8242 } 8243 return false; 8244} 8245 8246/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 8247/// former case, Name will be non-null. In the later case, Name will be null. 8248/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 8249/// reference/declaration/definition of a tag. 8250Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 8251 SourceLocation KWLoc, CXXScopeSpec &SS, 8252 IdentifierInfo *Name, SourceLocation NameLoc, 8253 AttributeList *Attr, AccessSpecifier AS, 8254 SourceLocation ModulePrivateLoc, 8255 MultiTemplateParamsArg TemplateParameterLists, 8256 bool &OwnedDecl, bool &IsDependent, 8257 SourceLocation ScopedEnumKWLoc, 8258 bool ScopedEnumUsesClassTag, 8259 TypeResult UnderlyingType) { 8260 // If this is not a definition, it must have a name. 8261 IdentifierInfo *OrigName = Name; 8262 assert((Name != 0 || TUK == TUK_Definition) && 8263 "Nameless record must be a definition!"); 8264 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 8265 8266 OwnedDecl = false; 8267 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8268 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 8269 8270 // FIXME: Check explicit specializations more carefully. 8271 bool isExplicitSpecialization = false; 8272 bool Invalid = false; 8273 8274 // We only need to do this matching if we have template parameters 8275 // or a scope specifier, which also conveniently avoids this work 8276 // for non-C++ cases. 8277 if (TemplateParameterLists.size() > 0 || 8278 (SS.isNotEmpty() && TUK != TUK_Reference)) { 8279 if (TemplateParameterList *TemplateParams 8280 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 8281 TemplateParameterLists.get(), 8282 TemplateParameterLists.size(), 8283 TUK == TUK_Friend, 8284 isExplicitSpecialization, 8285 Invalid)) { 8286 if (TemplateParams->size() > 0) { 8287 // This is a declaration or definition of a class template (which may 8288 // be a member of another template). 8289 8290 if (Invalid) 8291 return 0; 8292 8293 OwnedDecl = false; 8294 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 8295 SS, Name, NameLoc, Attr, 8296 TemplateParams, AS, 8297 ModulePrivateLoc, 8298 TemplateParameterLists.size() - 1, 8299 (TemplateParameterList**) TemplateParameterLists.release()); 8300 return Result.get(); 8301 } else { 8302 // The "template<>" header is extraneous. 8303 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8304 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8305 isExplicitSpecialization = true; 8306 } 8307 } 8308 } 8309 8310 // Figure out the underlying type if this a enum declaration. We need to do 8311 // this early, because it's needed to detect if this is an incompatible 8312 // redeclaration. 8313 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 8314 8315 if (Kind == TTK_Enum) { 8316 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 8317 // No underlying type explicitly specified, or we failed to parse the 8318 // type, default to int. 8319 EnumUnderlying = Context.IntTy.getTypePtr(); 8320 else if (UnderlyingType.get()) { 8321 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 8322 // integral type; any cv-qualification is ignored. 8323 TypeSourceInfo *TI = 0; 8324 GetTypeFromParser(UnderlyingType.get(), &TI); 8325 EnumUnderlying = TI; 8326 8327 if (CheckEnumUnderlyingType(TI)) 8328 // Recover by falling back to int. 8329 EnumUnderlying = Context.IntTy.getTypePtr(); 8330 8331 if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI, 8332 UPPC_FixedUnderlyingType)) 8333 EnumUnderlying = Context.IntTy.getTypePtr(); 8334 8335 } else if (getLangOpts().MicrosoftMode) 8336 // Microsoft enums are always of int type. 8337 EnumUnderlying = Context.IntTy.getTypePtr(); 8338 } 8339 8340 DeclContext *SearchDC = CurContext; 8341 DeclContext *DC = CurContext; 8342 bool isStdBadAlloc = false; 8343 8344 RedeclarationKind Redecl = ForRedeclaration; 8345 if (TUK == TUK_Friend || TUK == TUK_Reference) 8346 Redecl = NotForRedeclaration; 8347 8348 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 8349 8350 if (Name && SS.isNotEmpty()) { 8351 // We have a nested-name tag ('struct foo::bar'). 8352 8353 // Check for invalid 'foo::'. 8354 if (SS.isInvalid()) { 8355 Name = 0; 8356 goto CreateNewDecl; 8357 } 8358 8359 // If this is a friend or a reference to a class in a dependent 8360 // context, don't try to make a decl for it. 8361 if (TUK == TUK_Friend || TUK == TUK_Reference) { 8362 DC = computeDeclContext(SS, false); 8363 if (!DC) { 8364 IsDependent = true; 8365 return 0; 8366 } 8367 } else { 8368 DC = computeDeclContext(SS, true); 8369 if (!DC) { 8370 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 8371 << SS.getRange(); 8372 return 0; 8373 } 8374 } 8375 8376 if (RequireCompleteDeclContext(SS, DC)) 8377 return 0; 8378 8379 SearchDC = DC; 8380 // Look-up name inside 'foo::'. 8381 LookupQualifiedName(Previous, DC); 8382 8383 if (Previous.isAmbiguous()) 8384 return 0; 8385 8386 if (Previous.empty()) { 8387 // Name lookup did not find anything. However, if the 8388 // nested-name-specifier refers to the current instantiation, 8389 // and that current instantiation has any dependent base 8390 // classes, we might find something at instantiation time: treat 8391 // this as a dependent elaborated-type-specifier. 8392 // But this only makes any sense for reference-like lookups. 8393 if (Previous.wasNotFoundInCurrentInstantiation() && 8394 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8395 IsDependent = true; 8396 return 0; 8397 } 8398 8399 // A tag 'foo::bar' must already exist. 8400 Diag(NameLoc, diag::err_not_tag_in_scope) 8401 << Kind << Name << DC << SS.getRange(); 8402 Name = 0; 8403 Invalid = true; 8404 goto CreateNewDecl; 8405 } 8406 } else if (Name) { 8407 // If this is a named struct, check to see if there was a previous forward 8408 // declaration or definition. 8409 // FIXME: We're looking into outer scopes here, even when we 8410 // shouldn't be. Doing so can result in ambiguities that we 8411 // shouldn't be diagnosing. 8412 LookupName(Previous, S); 8413 8414 if (Previous.isAmbiguous() && 8415 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 8416 LookupResult::Filter F = Previous.makeFilter(); 8417 while (F.hasNext()) { 8418 NamedDecl *ND = F.next(); 8419 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 8420 F.erase(); 8421 } 8422 F.done(); 8423 } 8424 8425 // Note: there used to be some attempt at recovery here. 8426 if (Previous.isAmbiguous()) 8427 return 0; 8428 8429 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) { 8430 // FIXME: This makes sure that we ignore the contexts associated 8431 // with C structs, unions, and enums when looking for a matching 8432 // tag declaration or definition. See the similar lookup tweak 8433 // in Sema::LookupName; is there a better way to deal with this? 8434 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 8435 SearchDC = SearchDC->getParent(); 8436 } 8437 } else if (S->isFunctionPrototypeScope()) { 8438 // If this is an enum declaration in function prototype scope, set its 8439 // initial context to the translation unit. 8440 // FIXME: [citation needed] 8441 SearchDC = Context.getTranslationUnitDecl(); 8442 } 8443 8444 if (Previous.isSingleResult() && 8445 Previous.getFoundDecl()->isTemplateParameter()) { 8446 // Maybe we will complain about the shadowed template parameter. 8447 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 8448 // Just pretend that we didn't see the previous declaration. 8449 Previous.clear(); 8450 } 8451 8452 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace && 8453 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 8454 // This is a declaration of or a reference to "std::bad_alloc". 8455 isStdBadAlloc = true; 8456 8457 if (Previous.empty() && StdBadAlloc) { 8458 // std::bad_alloc has been implicitly declared (but made invisible to 8459 // name lookup). Fill in this implicit declaration as the previous 8460 // declaration, so that the declarations get chained appropriately. 8461 Previous.addDecl(getStdBadAlloc()); 8462 } 8463 } 8464 8465 // If we didn't find a previous declaration, and this is a reference 8466 // (or friend reference), move to the correct scope. In C++, we 8467 // also need to do a redeclaration lookup there, just in case 8468 // there's a shadow friend decl. 8469 if (Name && Previous.empty() && 8470 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8471 if (Invalid) goto CreateNewDecl; 8472 assert(SS.isEmpty()); 8473 8474 if (TUK == TUK_Reference) { 8475 // C++ [basic.scope.pdecl]p5: 8476 // -- for an elaborated-type-specifier of the form 8477 // 8478 // class-key identifier 8479 // 8480 // if the elaborated-type-specifier is used in the 8481 // decl-specifier-seq or parameter-declaration-clause of a 8482 // function defined in namespace scope, the identifier is 8483 // declared as a class-name in the namespace that contains 8484 // the declaration; otherwise, except as a friend 8485 // declaration, the identifier is declared in the smallest 8486 // non-class, non-function-prototype scope that contains the 8487 // declaration. 8488 // 8489 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 8490 // C structs and unions. 8491 // 8492 // It is an error in C++ to declare (rather than define) an enum 8493 // type, including via an elaborated type specifier. We'll 8494 // diagnose that later; for now, declare the enum in the same 8495 // scope as we would have picked for any other tag type. 8496 // 8497 // GNU C also supports this behavior as part of its incomplete 8498 // enum types extension, while GNU C++ does not. 8499 // 8500 // Find the context where we'll be declaring the tag. 8501 // FIXME: We would like to maintain the current DeclContext as the 8502 // lexical context, 8503 while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod()) 8504 SearchDC = SearchDC->getParent(); 8505 8506 // Find the scope where we'll be declaring the tag. 8507 while (S->isClassScope() || 8508 (getLangOpts().CPlusPlus && 8509 S->isFunctionPrototypeScope()) || 8510 ((S->getFlags() & Scope::DeclScope) == 0) || 8511 (S->getEntity() && 8512 ((DeclContext *)S->getEntity())->isTransparentContext())) 8513 S = S->getParent(); 8514 } else { 8515 assert(TUK == TUK_Friend); 8516 // C++ [namespace.memdef]p3: 8517 // If a friend declaration in a non-local class first declares a 8518 // class or function, the friend class or function is a member of 8519 // the innermost enclosing namespace. 8520 SearchDC = SearchDC->getEnclosingNamespaceContext(); 8521 } 8522 8523 // In C++, we need to do a redeclaration lookup to properly 8524 // diagnose some problems. 8525 if (getLangOpts().CPlusPlus) { 8526 Previous.setRedeclarationKind(ForRedeclaration); 8527 LookupQualifiedName(Previous, SearchDC); 8528 } 8529 } 8530 8531 if (!Previous.empty()) { 8532 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 8533 8534 // It's okay to have a tag decl in the same scope as a typedef 8535 // which hides a tag decl in the same scope. Finding this 8536 // insanity with a redeclaration lookup can only actually happen 8537 // in C++. 8538 // 8539 // This is also okay for elaborated-type-specifiers, which is 8540 // technically forbidden by the current standard but which is 8541 // okay according to the likely resolution of an open issue; 8542 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 8543 if (getLangOpts().CPlusPlus) { 8544 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8545 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 8546 TagDecl *Tag = TT->getDecl(); 8547 if (Tag->getDeclName() == Name && 8548 Tag->getDeclContext()->getRedeclContext() 8549 ->Equals(TD->getDeclContext()->getRedeclContext())) { 8550 PrevDecl = Tag; 8551 Previous.clear(); 8552 Previous.addDecl(Tag); 8553 Previous.resolveKind(); 8554 } 8555 } 8556 } 8557 } 8558 8559 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 8560 // If this is a use of a previous tag, or if the tag is already declared 8561 // in the same scope (so that the definition/declaration completes or 8562 // rementions the tag), reuse the decl. 8563 if (TUK == TUK_Reference || TUK == TUK_Friend || 8564 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 8565 // Make sure that this wasn't declared as an enum and now used as a 8566 // struct or something similar. 8567 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 8568 TUK == TUK_Definition, KWLoc, 8569 *Name)) { 8570 bool SafeToContinue 8571 = (PrevTagDecl->getTagKind() != TTK_Enum && 8572 Kind != TTK_Enum); 8573 if (SafeToContinue) 8574 Diag(KWLoc, diag::err_use_with_wrong_tag) 8575 << Name 8576 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8577 PrevTagDecl->getKindName()); 8578 else 8579 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8580 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8581 8582 if (SafeToContinue) 8583 Kind = PrevTagDecl->getTagKind(); 8584 else { 8585 // Recover by making this an anonymous redefinition. 8586 Name = 0; 8587 Previous.clear(); 8588 Invalid = true; 8589 } 8590 } 8591 8592 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8593 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8594 8595 // If this is an elaborated-type-specifier for a scoped enumeration, 8596 // the 'class' keyword is not necessary and not permitted. 8597 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8598 if (ScopedEnum) 8599 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8600 << PrevEnum->isScoped() 8601 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8602 return PrevTagDecl; 8603 } 8604 8605 QualType EnumUnderlyingTy; 8606 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8607 EnumUnderlyingTy = TI->getType(); 8608 else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>()) 8609 EnumUnderlyingTy = QualType(T, 0); 8610 8611 // All conflicts with previous declarations are recovered by 8612 // returning the previous declaration, unless this is a definition, 8613 // in which case we want the caller to bail out. 8614 if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc, 8615 ScopedEnum, EnumUnderlyingTy, PrevEnum)) 8616 return TUK == TUK_Declaration ? PrevTagDecl : 0; 8617 } 8618 8619 if (!Invalid) { 8620 // If this is a use, just return the declaration we found. 8621 8622 // FIXME: In the future, return a variant or some other clue 8623 // for the consumer of this Decl to know it doesn't own it. 8624 // For our current ASTs this shouldn't be a problem, but will 8625 // need to be changed with DeclGroups. 8626 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8627 getLangOpts().MicrosoftExt)) || TUK == TUK_Friend) 8628 return PrevTagDecl; 8629 8630 // Diagnose attempts to redefine a tag. 8631 if (TUK == TUK_Definition) { 8632 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8633 // If we're defining a specialization and the previous definition 8634 // is from an implicit instantiation, don't emit an error 8635 // here; we'll catch this in the general case below. 8636 bool IsExplicitSpecializationAfterInstantiation = false; 8637 if (isExplicitSpecialization) { 8638 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def)) 8639 IsExplicitSpecializationAfterInstantiation = 8640 RD->getTemplateSpecializationKind() != 8641 TSK_ExplicitSpecialization; 8642 else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def)) 8643 IsExplicitSpecializationAfterInstantiation = 8644 ED->getTemplateSpecializationKind() != 8645 TSK_ExplicitSpecialization; 8646 } 8647 8648 if (!IsExplicitSpecializationAfterInstantiation) { 8649 // A redeclaration in function prototype scope in C isn't 8650 // visible elsewhere, so merely issue a warning. 8651 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope()) 8652 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name; 8653 else 8654 Diag(NameLoc, diag::err_redefinition) << Name; 8655 Diag(Def->getLocation(), diag::note_previous_definition); 8656 // If this is a redefinition, recover by making this 8657 // struct be anonymous, which will make any later 8658 // references get the previous definition. 8659 Name = 0; 8660 Previous.clear(); 8661 Invalid = true; 8662 } 8663 } else { 8664 // If the type is currently being defined, complain 8665 // about a nested redefinition. 8666 const TagType *Tag 8667 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8668 if (Tag->isBeingDefined()) { 8669 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8670 Diag(PrevTagDecl->getLocation(), 8671 diag::note_previous_definition); 8672 Name = 0; 8673 Previous.clear(); 8674 Invalid = true; 8675 } 8676 } 8677 8678 // Okay, this is definition of a previously declared or referenced 8679 // tag PrevDecl. We're going to create a new Decl for it. 8680 } 8681 } 8682 // If we get here we have (another) forward declaration or we 8683 // have a definition. Just create a new decl. 8684 8685 } else { 8686 // If we get here, this is a definition of a new tag type in a nested 8687 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8688 // new decl/type. We set PrevDecl to NULL so that the entities 8689 // have distinct types. 8690 Previous.clear(); 8691 } 8692 // If we get here, we're going to create a new Decl. If PrevDecl 8693 // is non-NULL, it's a definition of the tag declared by 8694 // PrevDecl. If it's NULL, we have a new definition. 8695 8696 8697 // Otherwise, PrevDecl is not a tag, but was found with tag 8698 // lookup. This is only actually possible in C++, where a few 8699 // things like templates still live in the tag namespace. 8700 } else { 8701 // Use a better diagnostic if an elaborated-type-specifier 8702 // found the wrong kind of type on the first 8703 // (non-redeclaration) lookup. 8704 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8705 !Previous.isForRedeclaration()) { 8706 unsigned Kind = 0; 8707 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8708 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8709 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8710 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8711 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8712 Invalid = true; 8713 8714 // Otherwise, only diagnose if the declaration is in scope. 8715 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8716 isExplicitSpecialization)) { 8717 // do nothing 8718 8719 // Diagnose implicit declarations introduced by elaborated types. 8720 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8721 unsigned Kind = 0; 8722 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8723 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8724 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8725 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8726 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8727 Invalid = true; 8728 8729 // Otherwise it's a declaration. Call out a particularly common 8730 // case here. 8731 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8732 unsigned Kind = 0; 8733 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8734 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8735 << Name << Kind << TND->getUnderlyingType(); 8736 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8737 Invalid = true; 8738 8739 // Otherwise, diagnose. 8740 } else { 8741 // The tag name clashes with something else in the target scope, 8742 // issue an error and recover by making this tag be anonymous. 8743 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8744 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8745 Name = 0; 8746 Invalid = true; 8747 } 8748 8749 // The existing declaration isn't relevant to us; we're in a 8750 // new scope, so clear out the previous declaration. 8751 Previous.clear(); 8752 } 8753 } 8754 8755CreateNewDecl: 8756 8757 TagDecl *PrevDecl = 0; 8758 if (Previous.isSingleResult()) 8759 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8760 8761 // If there is an identifier, use the location of the identifier as the 8762 // location of the decl, otherwise use the location of the struct/union 8763 // keyword. 8764 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8765 8766 // Otherwise, create a new declaration. If there is a previous 8767 // declaration of the same entity, the two will be linked via 8768 // PrevDecl. 8769 TagDecl *New; 8770 8771 bool IsForwardReference = false; 8772 if (Kind == TTK_Enum) { 8773 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8774 // enum X { A, B, C } D; D should chain to X. 8775 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8776 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8777 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8778 // If this is an undefined enum, warn. 8779 if (TUK != TUK_Definition && !Invalid) { 8780 TagDecl *Def; 8781 if (getLangOpts().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8782 // C++0x: 7.2p2: opaque-enum-declaration. 8783 // Conflicts are diagnosed above. Do nothing. 8784 } 8785 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8786 Diag(Loc, diag::ext_forward_ref_enum_def) 8787 << New; 8788 Diag(Def->getLocation(), diag::note_previous_definition); 8789 } else { 8790 unsigned DiagID = diag::ext_forward_ref_enum; 8791 if (getLangOpts().MicrosoftMode) 8792 DiagID = diag::ext_ms_forward_ref_enum; 8793 else if (getLangOpts().CPlusPlus) 8794 DiagID = diag::err_forward_ref_enum; 8795 Diag(Loc, DiagID); 8796 8797 // If this is a forward-declared reference to an enumeration, make a 8798 // note of it; we won't actually be introducing the declaration into 8799 // the declaration context. 8800 if (TUK == TUK_Reference) 8801 IsForwardReference = true; 8802 } 8803 } 8804 8805 if (EnumUnderlying) { 8806 EnumDecl *ED = cast<EnumDecl>(New); 8807 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8808 ED->setIntegerTypeSourceInfo(TI); 8809 else 8810 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8811 ED->setPromotionType(ED->getIntegerType()); 8812 } 8813 8814 } else { 8815 // struct/union/class 8816 8817 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8818 // struct X { int A; } D; D should chain to X. 8819 if (getLangOpts().CPlusPlus) { 8820 // FIXME: Look for a way to use RecordDecl for simple structs. 8821 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8822 cast_or_null<CXXRecordDecl>(PrevDecl)); 8823 8824 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8825 StdBadAlloc = cast<CXXRecordDecl>(New); 8826 } else 8827 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8828 cast_or_null<RecordDecl>(PrevDecl)); 8829 } 8830 8831 // Maybe add qualifier info. 8832 if (SS.isNotEmpty()) { 8833 if (SS.isSet()) { 8834 // If this is either a declaration or a definition, check the 8835 // nested-name-specifier against the current context. We don't do this 8836 // for explicit specializations, because they have similar checking 8837 // (with more specific diagnostics) in the call to 8838 // CheckMemberSpecialization, below. 8839 if (!isExplicitSpecialization && 8840 (TUK == TUK_Definition || TUK == TUK_Declaration) && 8841 diagnoseQualifiedDeclaration(SS, DC, OrigName, NameLoc)) 8842 Invalid = true; 8843 8844 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8845 if (TemplateParameterLists.size() > 0) { 8846 New->setTemplateParameterListsInfo(Context, 8847 TemplateParameterLists.size(), 8848 (TemplateParameterList**) TemplateParameterLists.release()); 8849 } 8850 } 8851 else 8852 Invalid = true; 8853 } 8854 8855 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8856 // Add alignment attributes if necessary; these attributes are checked when 8857 // the ASTContext lays out the structure. 8858 // 8859 // It is important for implementing the correct semantics that this 8860 // happen here (in act on tag decl). The #pragma pack stack is 8861 // maintained as a result of parser callbacks which can occur at 8862 // many points during the parsing of a struct declaration (because 8863 // the #pragma tokens are effectively skipped over during the 8864 // parsing of the struct). 8865 if (TUK == TUK_Definition) { 8866 AddAlignmentAttributesForRecord(RD); 8867 AddMsStructLayoutForRecord(RD); 8868 } 8869 } 8870 8871 if (ModulePrivateLoc.isValid()) { 8872 if (isExplicitSpecialization) 8873 Diag(New->getLocation(), diag::err_module_private_specialization) 8874 << 2 8875 << FixItHint::CreateRemoval(ModulePrivateLoc); 8876 // __module_private__ does not apply to local classes. However, we only 8877 // diagnose this as an error when the declaration specifiers are 8878 // freestanding. Here, we just ignore the __module_private__. 8879 else if (!SearchDC->isFunctionOrMethod()) 8880 New->setModulePrivate(); 8881 } 8882 8883 // If this is a specialization of a member class (of a class template), 8884 // check the specialization. 8885 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8886 Invalid = true; 8887 8888 if (Invalid) 8889 New->setInvalidDecl(); 8890 8891 if (Attr) 8892 ProcessDeclAttributeList(S, New, Attr); 8893 8894 // If we're declaring or defining a tag in function prototype scope 8895 // in C, note that this type can only be used within the function. 8896 if (Name && S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus) 8897 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8898 8899 // Set the lexical context. If the tag has a C++ scope specifier, the 8900 // lexical context will be different from the semantic context. 8901 New->setLexicalDeclContext(CurContext); 8902 8903 // Mark this as a friend decl if applicable. 8904 // In Microsoft mode, a friend declaration also acts as a forward 8905 // declaration so we always pass true to setObjectOfFriendDecl to make 8906 // the tag name visible. 8907 if (TUK == TUK_Friend) 8908 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8909 getLangOpts().MicrosoftExt); 8910 8911 // Set the access specifier. 8912 if (!Invalid && SearchDC->isRecord()) 8913 SetMemberAccessSpecifier(New, PrevDecl, AS); 8914 8915 if (TUK == TUK_Definition) 8916 New->startDefinition(); 8917 8918 // If this has an identifier, add it to the scope stack. 8919 if (TUK == TUK_Friend) { 8920 // We might be replacing an existing declaration in the lookup tables; 8921 // if so, borrow its access specifier. 8922 if (PrevDecl) 8923 New->setAccess(PrevDecl->getAccess()); 8924 8925 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8926 DC->makeDeclVisibleInContext(New); 8927 if (Name) // can be null along some error paths 8928 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8929 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8930 } else if (Name) { 8931 S = getNonFieldDeclScope(S); 8932 PushOnScopeChains(New, S, !IsForwardReference); 8933 if (IsForwardReference) 8934 SearchDC->makeDeclVisibleInContext(New); 8935 8936 } else { 8937 CurContext->addDecl(New); 8938 } 8939 8940 // If this is the C FILE type, notify the AST context. 8941 if (IdentifierInfo *II = New->getIdentifier()) 8942 if (!New->isInvalidDecl() && 8943 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8944 II->isStr("FILE")) 8945 Context.setFILEDecl(New); 8946 8947 // If we were in function prototype scope (and not in C++ mode), add this 8948 // tag to the list of decls to inject into the function definition scope. 8949 if (S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus && 8950 InFunctionDeclarator && Name) 8951 DeclsInPrototypeScope.push_back(New); 8952 8953 if (PrevDecl) 8954 mergeDeclAttributes(New, PrevDecl); 8955 8956 // If there's a #pragma GCC visibility in scope, set the visibility of this 8957 // record. 8958 AddPushedVisibilityAttribute(New); 8959 8960 OwnedDecl = true; 8961 return New; 8962} 8963 8964void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8965 AdjustDeclIfTemplate(TagD); 8966 TagDecl *Tag = cast<TagDecl>(TagD); 8967 8968 // Enter the tag context. 8969 PushDeclContext(S, Tag); 8970 8971 ActOnDocumentableDecl(TagD); 8972 8973 // If there's a #pragma GCC visibility in scope, set the visibility of this 8974 // record. 8975 AddPushedVisibilityAttribute(Tag); 8976} 8977 8978Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8979 assert(isa<ObjCContainerDecl>(IDecl) && 8980 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8981 DeclContext *OCD = cast<DeclContext>(IDecl); 8982 assert(getContainingDC(OCD) == CurContext && 8983 "The next DeclContext should be lexically contained in the current one."); 8984 CurContext = OCD; 8985 return IDecl; 8986} 8987 8988void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8989 SourceLocation FinalLoc, 8990 SourceLocation LBraceLoc) { 8991 AdjustDeclIfTemplate(TagD); 8992 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8993 8994 FieldCollector->StartClass(); 8995 8996 if (!Record->getIdentifier()) 8997 return; 8998 8999 if (FinalLoc.isValid()) 9000 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 9001 9002 // C++ [class]p2: 9003 // [...] The class-name is also inserted into the scope of the 9004 // class itself; this is known as the injected-class-name. For 9005 // purposes of access checking, the injected-class-name is treated 9006 // as if it were a public member name. 9007 CXXRecordDecl *InjectedClassName 9008 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 9009 Record->getLocStart(), Record->getLocation(), 9010 Record->getIdentifier(), 9011 /*PrevDecl=*/0, 9012 /*DelayTypeCreation=*/true); 9013 Context.getTypeDeclType(InjectedClassName, Record); 9014 InjectedClassName->setImplicit(); 9015 InjectedClassName->setAccess(AS_public); 9016 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 9017 InjectedClassName->setDescribedClassTemplate(Template); 9018 PushOnScopeChains(InjectedClassName, S); 9019 assert(InjectedClassName->isInjectedClassName() && 9020 "Broken injected-class-name"); 9021} 9022 9023void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 9024 SourceLocation RBraceLoc) { 9025 AdjustDeclIfTemplate(TagD); 9026 TagDecl *Tag = cast<TagDecl>(TagD); 9027 Tag->setRBraceLoc(RBraceLoc); 9028 9029 // Make sure we "complete" the definition even it is invalid. 9030 if (Tag->isBeingDefined()) { 9031 assert(Tag->isInvalidDecl() && "We should already have completed it"); 9032 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 9033 RD->completeDefinition(); 9034 } 9035 9036 if (isa<CXXRecordDecl>(Tag)) 9037 FieldCollector->FinishClass(); 9038 9039 // Exit this scope of this tag's definition. 9040 PopDeclContext(); 9041 9042 // Notify the consumer that we've defined a tag. 9043 Consumer.HandleTagDeclDefinition(Tag); 9044} 9045 9046void Sema::ActOnObjCContainerFinishDefinition() { 9047 // Exit this scope of this interface definition. 9048 PopDeclContext(); 9049} 9050 9051void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 9052 assert(DC == CurContext && "Mismatch of container contexts"); 9053 OriginalLexicalContext = DC; 9054 ActOnObjCContainerFinishDefinition(); 9055} 9056 9057void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 9058 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 9059 OriginalLexicalContext = 0; 9060} 9061 9062void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 9063 AdjustDeclIfTemplate(TagD); 9064 TagDecl *Tag = cast<TagDecl>(TagD); 9065 Tag->setInvalidDecl(); 9066 9067 // Make sure we "complete" the definition even it is invalid. 9068 if (Tag->isBeingDefined()) { 9069 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 9070 RD->completeDefinition(); 9071 } 9072 9073 // We're undoing ActOnTagStartDefinition here, not 9074 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 9075 // the FieldCollector. 9076 9077 PopDeclContext(); 9078} 9079 9080// Note that FieldName may be null for anonymous bitfields. 9081ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 9082 IdentifierInfo *FieldName, 9083 QualType FieldTy, Expr *BitWidth, 9084 bool *ZeroWidth) { 9085 // Default to true; that shouldn't confuse checks for emptiness 9086 if (ZeroWidth) 9087 *ZeroWidth = true; 9088 9089 // C99 6.7.2.1p4 - verify the field type. 9090 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 9091 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 9092 // Handle incomplete types with specific error. 9093 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 9094 return ExprError(); 9095 if (FieldName) 9096 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 9097 << FieldName << FieldTy << BitWidth->getSourceRange(); 9098 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 9099 << FieldTy << BitWidth->getSourceRange(); 9100 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 9101 UPPC_BitFieldWidth)) 9102 return ExprError(); 9103 9104 // If the bit-width is type- or value-dependent, don't try to check 9105 // it now. 9106 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 9107 return Owned(BitWidth); 9108 9109 llvm::APSInt Value; 9110 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 9111 if (ICE.isInvalid()) 9112 return ICE; 9113 BitWidth = ICE.take(); 9114 9115 if (Value != 0 && ZeroWidth) 9116 *ZeroWidth = false; 9117 9118 // Zero-width bitfield is ok for anonymous field. 9119 if (Value == 0 && FieldName) 9120 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 9121 9122 if (Value.isSigned() && Value.isNegative()) { 9123 if (FieldName) 9124 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 9125 << FieldName << Value.toString(10); 9126 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 9127 << Value.toString(10); 9128 } 9129 9130 if (!FieldTy->isDependentType()) { 9131 uint64_t TypeSize = Context.getTypeSize(FieldTy); 9132 if (Value.getZExtValue() > TypeSize) { 9133 if (!getLangOpts().CPlusPlus) { 9134 if (FieldName) 9135 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 9136 << FieldName << (unsigned)Value.getZExtValue() 9137 << (unsigned)TypeSize; 9138 9139 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 9140 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 9141 } 9142 9143 if (FieldName) 9144 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 9145 << FieldName << (unsigned)Value.getZExtValue() 9146 << (unsigned)TypeSize; 9147 else 9148 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 9149 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 9150 } 9151 } 9152 9153 return Owned(BitWidth); 9154} 9155 9156/// ActOnField - Each field of a C struct/union is passed into this in order 9157/// to create a FieldDecl object for it. 9158Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 9159 Declarator &D, Expr *BitfieldWidth) { 9160 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 9161 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 9162 /*InitStyle=*/ICIS_NoInit, AS_public); 9163 return Res; 9164} 9165 9166/// HandleField - Analyze a field of a C struct or a C++ data member. 9167/// 9168FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 9169 SourceLocation DeclStart, 9170 Declarator &D, Expr *BitWidth, 9171 InClassInitStyle InitStyle, 9172 AccessSpecifier AS) { 9173 IdentifierInfo *II = D.getIdentifier(); 9174 SourceLocation Loc = DeclStart; 9175 if (II) Loc = D.getIdentifierLoc(); 9176 9177 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9178 QualType T = TInfo->getType(); 9179 if (getLangOpts().CPlusPlus) { 9180 CheckExtraCXXDefaultArguments(D); 9181 9182 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9183 UPPC_DataMemberType)) { 9184 D.setInvalidType(); 9185 T = Context.IntTy; 9186 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 9187 } 9188 } 9189 9190 DiagnoseFunctionSpecifiers(D); 9191 9192 if (D.getDeclSpec().isThreadSpecified()) 9193 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 9194 if (D.getDeclSpec().isConstexprSpecified()) 9195 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 9196 << 2; 9197 9198 // Check to see if this name was declared as a member previously 9199 NamedDecl *PrevDecl = 0; 9200 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 9201 LookupName(Previous, S); 9202 switch (Previous.getResultKind()) { 9203 case LookupResult::Found: 9204 case LookupResult::FoundUnresolvedValue: 9205 PrevDecl = Previous.getAsSingle<NamedDecl>(); 9206 break; 9207 9208 case LookupResult::FoundOverloaded: 9209 PrevDecl = Previous.getRepresentativeDecl(); 9210 break; 9211 9212 case LookupResult::NotFound: 9213 case LookupResult::NotFoundInCurrentInstantiation: 9214 case LookupResult::Ambiguous: 9215 break; 9216 } 9217 Previous.suppressDiagnostics(); 9218 9219 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9220 // Maybe we will complain about the shadowed template parameter. 9221 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9222 // Just pretend that we didn't see the previous declaration. 9223 PrevDecl = 0; 9224 } 9225 9226 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 9227 PrevDecl = 0; 9228 9229 bool Mutable 9230 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 9231 SourceLocation TSSL = D.getLocStart(); 9232 FieldDecl *NewFD 9233 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, InitStyle, 9234 TSSL, AS, PrevDecl, &D); 9235 9236 if (NewFD->isInvalidDecl()) 9237 Record->setInvalidDecl(); 9238 9239 if (D.getDeclSpec().isModulePrivateSpecified()) 9240 NewFD->setModulePrivate(); 9241 9242 if (NewFD->isInvalidDecl() && PrevDecl) { 9243 // Don't introduce NewFD into scope; there's already something 9244 // with the same name in the same scope. 9245 } else if (II) { 9246 PushOnScopeChains(NewFD, S); 9247 } else 9248 Record->addDecl(NewFD); 9249 9250 return NewFD; 9251} 9252 9253/// \brief Build a new FieldDecl and check its well-formedness. 9254/// 9255/// This routine builds a new FieldDecl given the fields name, type, 9256/// record, etc. \p PrevDecl should refer to any previous declaration 9257/// with the same name and in the same scope as the field to be 9258/// created. 9259/// 9260/// \returns a new FieldDecl. 9261/// 9262/// \todo The Declarator argument is a hack. It will be removed once 9263FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 9264 TypeSourceInfo *TInfo, 9265 RecordDecl *Record, SourceLocation Loc, 9266 bool Mutable, Expr *BitWidth, 9267 InClassInitStyle InitStyle, 9268 SourceLocation TSSL, 9269 AccessSpecifier AS, NamedDecl *PrevDecl, 9270 Declarator *D) { 9271 IdentifierInfo *II = Name.getAsIdentifierInfo(); 9272 bool InvalidDecl = false; 9273 if (D) InvalidDecl = D->isInvalidType(); 9274 9275 // If we receive a broken type, recover by assuming 'int' and 9276 // marking this declaration as invalid. 9277 if (T.isNull()) { 9278 InvalidDecl = true; 9279 T = Context.IntTy; 9280 } 9281 9282 QualType EltTy = Context.getBaseElementType(T); 9283 if (!EltTy->isDependentType()) { 9284 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 9285 // Fields of incomplete type force their record to be invalid. 9286 Record->setInvalidDecl(); 9287 InvalidDecl = true; 9288 } else { 9289 NamedDecl *Def; 9290 EltTy->isIncompleteType(&Def); 9291 if (Def && Def->isInvalidDecl()) { 9292 Record->setInvalidDecl(); 9293 InvalidDecl = true; 9294 } 9295 } 9296 } 9297 9298 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9299 // than a variably modified type. 9300 if (!InvalidDecl && T->isVariablyModifiedType()) { 9301 bool SizeIsNegative; 9302 llvm::APSInt Oversized; 9303 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 9304 SizeIsNegative, 9305 Oversized); 9306 if (!FixedTy.isNull()) { 9307 Diag(Loc, diag::warn_illegal_constant_array_size); 9308 T = FixedTy; 9309 } else { 9310 if (SizeIsNegative) 9311 Diag(Loc, diag::err_typecheck_negative_array_size); 9312 else if (Oversized.getBoolValue()) 9313 Diag(Loc, diag::err_array_too_large) 9314 << Oversized.toString(10); 9315 else 9316 Diag(Loc, diag::err_typecheck_field_variable_size); 9317 InvalidDecl = true; 9318 } 9319 } 9320 9321 // Fields can not have abstract class types 9322 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 9323 diag::err_abstract_type_in_decl, 9324 AbstractFieldType)) 9325 InvalidDecl = true; 9326 9327 bool ZeroWidth = false; 9328 // If this is declared as a bit-field, check the bit-field. 9329 if (!InvalidDecl && BitWidth) { 9330 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 9331 if (!BitWidth) { 9332 InvalidDecl = true; 9333 BitWidth = 0; 9334 ZeroWidth = false; 9335 } 9336 } 9337 9338 // Check that 'mutable' is consistent with the type of the declaration. 9339 if (!InvalidDecl && Mutable) { 9340 unsigned DiagID = 0; 9341 if (T->isReferenceType()) 9342 DiagID = diag::err_mutable_reference; 9343 else if (T.isConstQualified()) 9344 DiagID = diag::err_mutable_const; 9345 9346 if (DiagID) { 9347 SourceLocation ErrLoc = Loc; 9348 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 9349 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 9350 Diag(ErrLoc, DiagID); 9351 Mutable = false; 9352 InvalidDecl = true; 9353 } 9354 } 9355 9356 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 9357 BitWidth, Mutable, InitStyle); 9358 if (InvalidDecl) 9359 NewFD->setInvalidDecl(); 9360 9361 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 9362 Diag(Loc, diag::err_duplicate_member) << II; 9363 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9364 NewFD->setInvalidDecl(); 9365 } 9366 9367 if (!InvalidDecl && getLangOpts().CPlusPlus) { 9368 if (Record->isUnion()) { 9369 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9370 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9371 if (RDecl->getDefinition()) { 9372 // C++ [class.union]p1: An object of a class with a non-trivial 9373 // constructor, a non-trivial copy constructor, a non-trivial 9374 // destructor, or a non-trivial copy assignment operator 9375 // cannot be a member of a union, nor can an array of such 9376 // objects. 9377 if (CheckNontrivialField(NewFD)) 9378 NewFD->setInvalidDecl(); 9379 } 9380 } 9381 9382 // C++ [class.union]p1: If a union contains a member of reference type, 9383 // the program is ill-formed. 9384 if (EltTy->isReferenceType()) { 9385 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 9386 << NewFD->getDeclName() << EltTy; 9387 NewFD->setInvalidDecl(); 9388 } 9389 } 9390 } 9391 9392 // FIXME: We need to pass in the attributes given an AST 9393 // representation, not a parser representation. 9394 if (D) 9395 // FIXME: What to pass instead of TUScope? 9396 ProcessDeclAttributes(TUScope, NewFD, *D); 9397 9398 // In auto-retain/release, infer strong retension for fields of 9399 // retainable type. 9400 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 9401 NewFD->setInvalidDecl(); 9402 9403 if (T.isObjCGCWeak()) 9404 Diag(Loc, diag::warn_attribute_weak_on_field); 9405 9406 NewFD->setAccess(AS); 9407 return NewFD; 9408} 9409 9410bool Sema::CheckNontrivialField(FieldDecl *FD) { 9411 assert(FD); 9412 assert(getLangOpts().CPlusPlus && "valid check only for C++"); 9413 9414 if (FD->isInvalidDecl()) 9415 return true; 9416 9417 QualType EltTy = Context.getBaseElementType(FD->getType()); 9418 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9419 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9420 if (RDecl->getDefinition()) { 9421 // We check for copy constructors before constructors 9422 // because otherwise we'll never get complaints about 9423 // copy constructors. 9424 9425 CXXSpecialMember member = CXXInvalid; 9426 if (!RDecl->hasTrivialCopyConstructor()) 9427 member = CXXCopyConstructor; 9428 else if (!RDecl->hasTrivialDefaultConstructor()) 9429 member = CXXDefaultConstructor; 9430 else if (!RDecl->hasTrivialCopyAssignment()) 9431 member = CXXCopyAssignment; 9432 else if (!RDecl->hasTrivialDestructor()) 9433 member = CXXDestructor; 9434 9435 if (member != CXXInvalid) { 9436 if (!getLangOpts().CPlusPlus0x && 9437 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) { 9438 // Objective-C++ ARC: it is an error to have a non-trivial field of 9439 // a union. However, system headers in Objective-C programs 9440 // occasionally have Objective-C lifetime objects within unions, 9441 // and rather than cause the program to fail, we make those 9442 // members unavailable. 9443 SourceLocation Loc = FD->getLocation(); 9444 if (getSourceManager().isInSystemHeader(Loc)) { 9445 if (!FD->hasAttr<UnavailableAttr>()) 9446 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 9447 "this system field has retaining ownership")); 9448 return false; 9449 } 9450 } 9451 9452 Diag(FD->getLocation(), getLangOpts().CPlusPlus0x ? 9453 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 9454 diag::err_illegal_union_or_anon_struct_member) 9455 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 9456 DiagnoseNontrivial(RT, member); 9457 return !getLangOpts().CPlusPlus0x; 9458 } 9459 } 9460 } 9461 9462 return false; 9463} 9464 9465/// If the given constructor is user-provided, produce a diagnostic explaining 9466/// that it makes the class non-trivial. 9467static bool DiagnoseNontrivialUserProvidedCtor(Sema &S, QualType QT, 9468 CXXConstructorDecl *CD, 9469 Sema::CXXSpecialMember CSM) { 9470 if (!CD->isUserProvided()) 9471 return false; 9472 9473 SourceLocation CtorLoc = CD->getLocation(); 9474 S.Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << CSM; 9475 return true; 9476} 9477 9478/// DiagnoseNontrivial - Given that a class has a non-trivial 9479/// special member, figure out why. 9480void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 9481 QualType QT(T, 0U); 9482 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 9483 9484 // Check whether the member was user-declared. 9485 switch (member) { 9486 case CXXInvalid: 9487 break; 9488 9489 case CXXDefaultConstructor: 9490 if (RD->hasUserDeclaredConstructor()) { 9491 typedef CXXRecordDecl::ctor_iterator ctor_iter; 9492 for (ctor_iter CI = RD->ctor_begin(), CE = RD->ctor_end(); CI != CE; ++CI) 9493 if (DiagnoseNontrivialUserProvidedCtor(*this, QT, *CI, member)) 9494 return; 9495 9496 // No user-provided constructors; look for constructor templates. 9497 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 9498 tmpl_iter; 9499 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); 9500 TI != TE; ++TI) { 9501 CXXConstructorDecl *CD = 9502 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()); 9503 if (CD && DiagnoseNontrivialUserProvidedCtor(*this, QT, CD, member)) 9504 return; 9505 } 9506 } 9507 break; 9508 9509 case CXXCopyConstructor: 9510 if (RD->hasUserDeclaredCopyConstructor()) { 9511 SourceLocation CtorLoc = 9512 RD->getCopyConstructor(0)->getLocation(); 9513 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9514 return; 9515 } 9516 break; 9517 9518 case CXXMoveConstructor: 9519 if (RD->hasUserDeclaredMoveConstructor()) { 9520 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 9521 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9522 return; 9523 } 9524 break; 9525 9526 case CXXCopyAssignment: 9527 if (RD->hasUserDeclaredCopyAssignment()) { 9528 SourceLocation AssignLoc = 9529 RD->getCopyAssignmentOperator(0)->getLocation(); 9530 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9531 return; 9532 } 9533 break; 9534 9535 case CXXMoveAssignment: 9536 if (RD->hasUserDeclaredMoveAssignment()) { 9537 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 9538 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9539 return; 9540 } 9541 break; 9542 9543 case CXXDestructor: 9544 if (RD->hasUserDeclaredDestructor()) { 9545 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 9546 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9547 return; 9548 } 9549 break; 9550 } 9551 9552 typedef CXXRecordDecl::base_class_iterator base_iter; 9553 9554 // Virtual bases and members inhibit trivial copying/construction, 9555 // but not trivial destruction. 9556 if (member != CXXDestructor) { 9557 // Check for virtual bases. vbases includes indirect virtual bases, 9558 // so we just iterate through the direct bases. 9559 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 9560 if (bi->isVirtual()) { 9561 SourceLocation BaseLoc = bi->getLocStart(); 9562 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 9563 return; 9564 } 9565 9566 // Check for virtual methods. 9567 typedef CXXRecordDecl::method_iterator meth_iter; 9568 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 9569 ++mi) { 9570 if (mi->isVirtual()) { 9571 SourceLocation MLoc = mi->getLocStart(); 9572 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 9573 return; 9574 } 9575 } 9576 } 9577 9578 bool (CXXRecordDecl::*hasTrivial)() const; 9579 switch (member) { 9580 case CXXDefaultConstructor: 9581 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 9582 case CXXCopyConstructor: 9583 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 9584 case CXXCopyAssignment: 9585 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 9586 case CXXDestructor: 9587 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 9588 default: 9589 llvm_unreachable("unexpected special member"); 9590 } 9591 9592 // Check for nontrivial bases (and recurse). 9593 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 9594 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 9595 assert(BaseRT && "Don't know how to handle dependent bases"); 9596 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 9597 if (!(BaseRecTy->*hasTrivial)()) { 9598 SourceLocation BaseLoc = bi->getLocStart(); 9599 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 9600 DiagnoseNontrivial(BaseRT, member); 9601 return; 9602 } 9603 } 9604 9605 // Check for nontrivial members (and recurse). 9606 typedef RecordDecl::field_iterator field_iter; 9607 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 9608 ++fi) { 9609 QualType EltTy = Context.getBaseElementType(fi->getType()); 9610 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 9611 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 9612 9613 if (!(EltRD->*hasTrivial)()) { 9614 SourceLocation FLoc = fi->getLocation(); 9615 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 9616 DiagnoseNontrivial(EltRT, member); 9617 return; 9618 } 9619 } 9620 9621 if (EltTy->isObjCLifetimeType()) { 9622 switch (EltTy.getObjCLifetime()) { 9623 case Qualifiers::OCL_None: 9624 case Qualifiers::OCL_ExplicitNone: 9625 break; 9626 9627 case Qualifiers::OCL_Autoreleasing: 9628 case Qualifiers::OCL_Weak: 9629 case Qualifiers::OCL_Strong: 9630 Diag(fi->getLocation(), diag::note_nontrivial_objc_ownership) 9631 << QT << EltTy.getObjCLifetime(); 9632 return; 9633 } 9634 } 9635 } 9636 9637 llvm_unreachable("found no explanation for non-trivial member"); 9638} 9639 9640/// TranslateIvarVisibility - Translate visibility from a token ID to an 9641/// AST enum value. 9642static ObjCIvarDecl::AccessControl 9643TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9644 switch (ivarVisibility) { 9645 default: llvm_unreachable("Unknown visitibility kind"); 9646 case tok::objc_private: return ObjCIvarDecl::Private; 9647 case tok::objc_public: return ObjCIvarDecl::Public; 9648 case tok::objc_protected: return ObjCIvarDecl::Protected; 9649 case tok::objc_package: return ObjCIvarDecl::Package; 9650 } 9651} 9652 9653/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9654/// in order to create an IvarDecl object for it. 9655Decl *Sema::ActOnIvar(Scope *S, 9656 SourceLocation DeclStart, 9657 Declarator &D, Expr *BitfieldWidth, 9658 tok::ObjCKeywordKind Visibility) { 9659 9660 IdentifierInfo *II = D.getIdentifier(); 9661 Expr *BitWidth = (Expr*)BitfieldWidth; 9662 SourceLocation Loc = DeclStart; 9663 if (II) Loc = D.getIdentifierLoc(); 9664 9665 // FIXME: Unnamed fields can be handled in various different ways, for 9666 // example, unnamed unions inject all members into the struct namespace! 9667 9668 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9669 QualType T = TInfo->getType(); 9670 9671 if (BitWidth) { 9672 // 6.7.2.1p3, 6.7.2.1p4 9673 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9674 if (!BitWidth) 9675 D.setInvalidType(); 9676 } else { 9677 // Not a bitfield. 9678 9679 // validate II. 9680 9681 } 9682 if (T->isReferenceType()) { 9683 Diag(Loc, diag::err_ivar_reference_type); 9684 D.setInvalidType(); 9685 } 9686 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9687 // than a variably modified type. 9688 else if (T->isVariablyModifiedType()) { 9689 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9690 D.setInvalidType(); 9691 } 9692 9693 // Get the visibility (access control) for this ivar. 9694 ObjCIvarDecl::AccessControl ac = 9695 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9696 : ObjCIvarDecl::None; 9697 // Must set ivar's DeclContext to its enclosing interface. 9698 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9699 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9700 return 0; 9701 ObjCContainerDecl *EnclosingContext; 9702 if (ObjCImplementationDecl *IMPDecl = 9703 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9704 if (LangOpts.ObjCRuntime.isFragile()) { 9705 // Case of ivar declared in an implementation. Context is that of its class. 9706 EnclosingContext = IMPDecl->getClassInterface(); 9707 assert(EnclosingContext && "Implementation has no class interface!"); 9708 } 9709 else 9710 EnclosingContext = EnclosingDecl; 9711 } else { 9712 if (ObjCCategoryDecl *CDecl = 9713 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9714 if (LangOpts.ObjCRuntime.isFragile() || !CDecl->IsClassExtension()) { 9715 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9716 return 0; 9717 } 9718 } 9719 EnclosingContext = EnclosingDecl; 9720 } 9721 9722 // Construct the decl. 9723 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9724 DeclStart, Loc, II, T, 9725 TInfo, ac, (Expr *)BitfieldWidth); 9726 9727 if (II) { 9728 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9729 ForRedeclaration); 9730 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9731 && !isa<TagDecl>(PrevDecl)) { 9732 Diag(Loc, diag::err_duplicate_member) << II; 9733 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9734 NewID->setInvalidDecl(); 9735 } 9736 } 9737 9738 // Process attributes attached to the ivar. 9739 ProcessDeclAttributes(S, NewID, D); 9740 9741 if (D.isInvalidType()) 9742 NewID->setInvalidDecl(); 9743 9744 // In ARC, infer 'retaining' for ivars of retainable type. 9745 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9746 NewID->setInvalidDecl(); 9747 9748 if (D.getDeclSpec().isModulePrivateSpecified()) 9749 NewID->setModulePrivate(); 9750 9751 if (II) { 9752 // FIXME: When interfaces are DeclContexts, we'll need to add 9753 // these to the interface. 9754 S->AddDecl(NewID); 9755 IdResolver.AddDecl(NewID); 9756 } 9757 9758 if (LangOpts.ObjCRuntime.isNonFragile() && 9759 !NewID->isInvalidDecl() && isa<ObjCInterfaceDecl>(EnclosingDecl)) 9760 Diag(Loc, diag::warn_ivars_in_interface); 9761 9762 return NewID; 9763} 9764 9765/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9766/// class and class extensions. For every class @interface and class 9767/// extension @interface, if the last ivar is a bitfield of any type, 9768/// then add an implicit `char :0` ivar to the end of that interface. 9769void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9770 SmallVectorImpl<Decl *> &AllIvarDecls) { 9771 if (LangOpts.ObjCRuntime.isFragile() || AllIvarDecls.empty()) 9772 return; 9773 9774 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9775 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9776 9777 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9778 return; 9779 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9780 if (!ID) { 9781 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9782 if (!CD->IsClassExtension()) 9783 return; 9784 } 9785 // No need to add this to end of @implementation. 9786 else 9787 return; 9788 } 9789 // All conditions are met. Add a new bitfield to the tail end of ivars. 9790 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9791 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9792 9793 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9794 DeclLoc, DeclLoc, 0, 9795 Context.CharTy, 9796 Context.getTrivialTypeSourceInfo(Context.CharTy, 9797 DeclLoc), 9798 ObjCIvarDecl::Private, BW, 9799 true); 9800 AllIvarDecls.push_back(Ivar); 9801} 9802 9803void Sema::ActOnFields(Scope* S, 9804 SourceLocation RecLoc, Decl *EnclosingDecl, 9805 llvm::ArrayRef<Decl *> Fields, 9806 SourceLocation LBrac, SourceLocation RBrac, 9807 AttributeList *Attr) { 9808 assert(EnclosingDecl && "missing record or interface decl"); 9809 9810 // If this is an Objective-C @implementation or category and we have 9811 // new fields here we should reset the layout of the interface since 9812 // it will now change. 9813 if (!Fields.empty() && isa<ObjCContainerDecl>(EnclosingDecl)) { 9814 ObjCContainerDecl *DC = cast<ObjCContainerDecl>(EnclosingDecl); 9815 switch (DC->getKind()) { 9816 default: break; 9817 case Decl::ObjCCategory: 9818 Context.ResetObjCLayout(cast<ObjCCategoryDecl>(DC)->getClassInterface()); 9819 break; 9820 case Decl::ObjCImplementation: 9821 Context. 9822 ResetObjCLayout(cast<ObjCImplementationDecl>(DC)->getClassInterface()); 9823 break; 9824 } 9825 } 9826 9827 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9828 9829 // Start counting up the number of named members; make sure to include 9830 // members of anonymous structs and unions in the total. 9831 unsigned NumNamedMembers = 0; 9832 if (Record) { 9833 for (RecordDecl::decl_iterator i = Record->decls_begin(), 9834 e = Record->decls_end(); i != e; i++) { 9835 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i)) 9836 if (IFD->getDeclName()) 9837 ++NumNamedMembers; 9838 } 9839 } 9840 9841 // Verify that all the fields are okay. 9842 SmallVector<FieldDecl*, 32> RecFields; 9843 9844 bool ARCErrReported = false; 9845 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9846 i != end; ++i) { 9847 FieldDecl *FD = cast<FieldDecl>(*i); 9848 9849 // Get the type for the field. 9850 const Type *FDTy = FD->getType().getTypePtr(); 9851 9852 if (!FD->isAnonymousStructOrUnion()) { 9853 // Remember all fields written by the user. 9854 RecFields.push_back(FD); 9855 } 9856 9857 // If the field is already invalid for some reason, don't emit more 9858 // diagnostics about it. 9859 if (FD->isInvalidDecl()) { 9860 EnclosingDecl->setInvalidDecl(); 9861 continue; 9862 } 9863 9864 // C99 6.7.2.1p2: 9865 // A structure or union shall not contain a member with 9866 // incomplete or function type (hence, a structure shall not 9867 // contain an instance of itself, but may contain a pointer to 9868 // an instance of itself), except that the last member of a 9869 // structure with more than one named member may have incomplete 9870 // array type; such a structure (and any union containing, 9871 // possibly recursively, a member that is such a structure) 9872 // shall not be a member of a structure or an element of an 9873 // array. 9874 if (FDTy->isFunctionType()) { 9875 // Field declared as a function. 9876 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9877 << FD->getDeclName(); 9878 FD->setInvalidDecl(); 9879 EnclosingDecl->setInvalidDecl(); 9880 continue; 9881 } else if (FDTy->isIncompleteArrayType() && Record && 9882 ((i + 1 == Fields.end() && !Record->isUnion()) || 9883 ((getLangOpts().MicrosoftExt || 9884 getLangOpts().CPlusPlus) && 9885 (i + 1 == Fields.end() || Record->isUnion())))) { 9886 // Flexible array member. 9887 // Microsoft and g++ is more permissive regarding flexible array. 9888 // It will accept flexible array in union and also 9889 // as the sole element of a struct/class. 9890 if (getLangOpts().MicrosoftExt) { 9891 if (Record->isUnion()) 9892 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9893 << FD->getDeclName(); 9894 else if (Fields.size() == 1) 9895 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9896 << FD->getDeclName() << Record->getTagKind(); 9897 } else if (getLangOpts().CPlusPlus) { 9898 if (Record->isUnion()) 9899 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9900 << FD->getDeclName(); 9901 else if (Fields.size() == 1) 9902 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9903 << FD->getDeclName() << Record->getTagKind(); 9904 } else if (!getLangOpts().C99) { 9905 if (Record->isUnion()) 9906 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9907 << FD->getDeclName(); 9908 else 9909 Diag(FD->getLocation(), diag::ext_c99_flexible_array_member) 9910 << FD->getDeclName() << Record->getTagKind(); 9911 } else if (NumNamedMembers < 1) { 9912 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9913 << FD->getDeclName(); 9914 FD->setInvalidDecl(); 9915 EnclosingDecl->setInvalidDecl(); 9916 continue; 9917 } 9918 if (!FD->getType()->isDependentType() && 9919 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9920 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9921 << FD->getDeclName() << FD->getType(); 9922 FD->setInvalidDecl(); 9923 EnclosingDecl->setInvalidDecl(); 9924 continue; 9925 } 9926 // Okay, we have a legal flexible array member at the end of the struct. 9927 if (Record) 9928 Record->setHasFlexibleArrayMember(true); 9929 } else if (!FDTy->isDependentType() && 9930 RequireCompleteType(FD->getLocation(), FD->getType(), 9931 diag::err_field_incomplete)) { 9932 // Incomplete type 9933 FD->setInvalidDecl(); 9934 EnclosingDecl->setInvalidDecl(); 9935 continue; 9936 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9937 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9938 // If this is a member of a union, then entire union becomes "flexible". 9939 if (Record && Record->isUnion()) { 9940 Record->setHasFlexibleArrayMember(true); 9941 } else { 9942 // If this is a struct/class and this is not the last element, reject 9943 // it. Note that GCC supports variable sized arrays in the middle of 9944 // structures. 9945 if (i + 1 != Fields.end()) 9946 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9947 << FD->getDeclName() << FD->getType(); 9948 else { 9949 // We support flexible arrays at the end of structs in 9950 // other structs as an extension. 9951 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9952 << FD->getDeclName(); 9953 if (Record) 9954 Record->setHasFlexibleArrayMember(true); 9955 } 9956 } 9957 } 9958 if (isa<ObjCContainerDecl>(EnclosingDecl) && 9959 RequireNonAbstractType(FD->getLocation(), FD->getType(), 9960 diag::err_abstract_type_in_decl, 9961 AbstractIvarType)) { 9962 // Ivars can not have abstract class types 9963 FD->setInvalidDecl(); 9964 } 9965 if (Record && FDTTy->getDecl()->hasObjectMember()) 9966 Record->setHasObjectMember(true); 9967 } else if (FDTy->isObjCObjectType()) { 9968 /// A field cannot be an Objective-c object 9969 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9970 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9971 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9972 FD->setType(T); 9973 } else if (!getLangOpts().CPlusPlus) { 9974 if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported) { 9975 // It's an error in ARC if a field has lifetime. 9976 // We don't want to report this in a system header, though, 9977 // so we just make the field unavailable. 9978 // FIXME: that's really not sufficient; we need to make the type 9979 // itself invalid to, say, initialize or copy. 9980 QualType T = FD->getType(); 9981 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9982 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9983 SourceLocation loc = FD->getLocation(); 9984 if (getSourceManager().isInSystemHeader(loc)) { 9985 if (!FD->hasAttr<UnavailableAttr>()) { 9986 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9987 "this system field has retaining ownership")); 9988 } 9989 } else { 9990 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9991 << T->isBlockPointerType(); 9992 } 9993 ARCErrReported = true; 9994 } 9995 } 9996 else if (getLangOpts().ObjC1 && 9997 getLangOpts().getGC() != LangOptions::NonGC && 9998 Record && !Record->hasObjectMember()) { 9999 if (FD->getType()->isObjCObjectPointerType() || 10000 FD->getType().isObjCGCStrong()) 10001 Record->setHasObjectMember(true); 10002 else if (Context.getAsArrayType(FD->getType())) { 10003 QualType BaseType = Context.getBaseElementType(FD->getType()); 10004 if (BaseType->isRecordType() && 10005 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 10006 Record->setHasObjectMember(true); 10007 else if (BaseType->isObjCObjectPointerType() || 10008 BaseType.isObjCGCStrong()) 10009 Record->setHasObjectMember(true); 10010 } 10011 } 10012 } 10013 // Keep track of the number of named members. 10014 if (FD->getIdentifier()) 10015 ++NumNamedMembers; 10016 } 10017 10018 // Okay, we successfully defined 'Record'. 10019 if (Record) { 10020 bool Completed = false; 10021 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 10022 if (!CXXRecord->isInvalidDecl()) { 10023 // Set access bits correctly on the directly-declared conversions. 10024 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 10025 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 10026 I != E; ++I) 10027 Convs->setAccess(I, (*I)->getAccess()); 10028 10029 if (!CXXRecord->isDependentType()) { 10030 // Objective-C Automatic Reference Counting: 10031 // If a class has a non-static data member of Objective-C pointer 10032 // type (or array thereof), it is a non-POD type and its 10033 // default constructor (if any), copy constructor, copy assignment 10034 // operator, and destructor are non-trivial. 10035 // 10036 // This rule is also handled by CXXRecordDecl::completeDefinition(). 10037 // However, here we check whether this particular class is only 10038 // non-POD because of the presence of an Objective-C pointer member. 10039 // If so, objects of this type cannot be shared between code compiled 10040 // with ARC and code compiled with manual retain/release. 10041 if (getLangOpts().ObjCAutoRefCount && 10042 CXXRecord->hasObjectMember() && 10043 CXXRecord->getLinkage() == ExternalLinkage) { 10044 if (CXXRecord->isPOD()) { 10045 Diag(CXXRecord->getLocation(), 10046 diag::warn_arc_non_pod_class_with_object_member) 10047 << CXXRecord; 10048 } else { 10049 // FIXME: Fix-Its would be nice here, but finding a good location 10050 // for them is going to be tricky. 10051 if (CXXRecord->hasTrivialCopyConstructor()) 10052 Diag(CXXRecord->getLocation(), 10053 diag::warn_arc_trivial_member_function_with_object_member) 10054 << CXXRecord << 0; 10055 if (CXXRecord->hasTrivialCopyAssignment()) 10056 Diag(CXXRecord->getLocation(), 10057 diag::warn_arc_trivial_member_function_with_object_member) 10058 << CXXRecord << 1; 10059 if (CXXRecord->hasTrivialDestructor()) 10060 Diag(CXXRecord->getLocation(), 10061 diag::warn_arc_trivial_member_function_with_object_member) 10062 << CXXRecord << 2; 10063 } 10064 } 10065 10066 // Adjust user-defined destructor exception spec. 10067 if (getLangOpts().CPlusPlus0x && 10068 CXXRecord->hasUserDeclaredDestructor()) 10069 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 10070 10071 // Add any implicitly-declared members to this class. 10072 AddImplicitlyDeclaredMembersToClass(CXXRecord); 10073 10074 // If we have virtual base classes, we may end up finding multiple 10075 // final overriders for a given virtual function. Check for this 10076 // problem now. 10077 if (CXXRecord->getNumVBases()) { 10078 CXXFinalOverriderMap FinalOverriders; 10079 CXXRecord->getFinalOverriders(FinalOverriders); 10080 10081 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 10082 MEnd = FinalOverriders.end(); 10083 M != MEnd; ++M) { 10084 for (OverridingMethods::iterator SO = M->second.begin(), 10085 SOEnd = M->second.end(); 10086 SO != SOEnd; ++SO) { 10087 assert(SO->second.size() > 0 && 10088 "Virtual function without overridding functions?"); 10089 if (SO->second.size() == 1) 10090 continue; 10091 10092 // C++ [class.virtual]p2: 10093 // In a derived class, if a virtual member function of a base 10094 // class subobject has more than one final overrider the 10095 // program is ill-formed. 10096 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 10097 << (NamedDecl *)M->first << Record; 10098 Diag(M->first->getLocation(), 10099 diag::note_overridden_virtual_function); 10100 for (OverridingMethods::overriding_iterator 10101 OM = SO->second.begin(), 10102 OMEnd = SO->second.end(); 10103 OM != OMEnd; ++OM) 10104 Diag(OM->Method->getLocation(), diag::note_final_overrider) 10105 << (NamedDecl *)M->first << OM->Method->getParent(); 10106 10107 Record->setInvalidDecl(); 10108 } 10109 } 10110 CXXRecord->completeDefinition(&FinalOverriders); 10111 Completed = true; 10112 } 10113 } 10114 } 10115 } 10116 10117 if (!Completed) 10118 Record->completeDefinition(); 10119 10120 } else { 10121 ObjCIvarDecl **ClsFields = 10122 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 10123 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 10124 ID->setEndOfDefinitionLoc(RBrac); 10125 // Add ivar's to class's DeclContext. 10126 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 10127 ClsFields[i]->setLexicalDeclContext(ID); 10128 ID->addDecl(ClsFields[i]); 10129 } 10130 // Must enforce the rule that ivars in the base classes may not be 10131 // duplicates. 10132 if (ID->getSuperClass()) 10133 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 10134 } else if (ObjCImplementationDecl *IMPDecl = 10135 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 10136 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 10137 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 10138 // Ivar declared in @implementation never belongs to the implementation. 10139 // Only it is in implementation's lexical context. 10140 ClsFields[I]->setLexicalDeclContext(IMPDecl); 10141 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 10142 IMPDecl->setIvarLBraceLoc(LBrac); 10143 IMPDecl->setIvarRBraceLoc(RBrac); 10144 } else if (ObjCCategoryDecl *CDecl = 10145 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 10146 // case of ivars in class extension; all other cases have been 10147 // reported as errors elsewhere. 10148 // FIXME. Class extension does not have a LocEnd field. 10149 // CDecl->setLocEnd(RBrac); 10150 // Add ivar's to class extension's DeclContext. 10151 // Diagnose redeclaration of private ivars. 10152 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 10153 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 10154 if (IDecl) { 10155 if (const ObjCIvarDecl *ClsIvar = 10156 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 10157 Diag(ClsFields[i]->getLocation(), 10158 diag::err_duplicate_ivar_declaration); 10159 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 10160 continue; 10161 } 10162 for (const ObjCCategoryDecl *ClsExtDecl = 10163 IDecl->getFirstClassExtension(); 10164 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 10165 if (const ObjCIvarDecl *ClsExtIvar = 10166 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 10167 Diag(ClsFields[i]->getLocation(), 10168 diag::err_duplicate_ivar_declaration); 10169 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 10170 continue; 10171 } 10172 } 10173 } 10174 ClsFields[i]->setLexicalDeclContext(CDecl); 10175 CDecl->addDecl(ClsFields[i]); 10176 } 10177 CDecl->setIvarLBraceLoc(LBrac); 10178 CDecl->setIvarRBraceLoc(RBrac); 10179 } 10180 } 10181 10182 if (Attr) 10183 ProcessDeclAttributeList(S, Record, Attr); 10184} 10185 10186/// \brief Determine whether the given integral value is representable within 10187/// the given type T. 10188static bool isRepresentableIntegerValue(ASTContext &Context, 10189 llvm::APSInt &Value, 10190 QualType T) { 10191 assert(T->isIntegralType(Context) && "Integral type required!"); 10192 unsigned BitWidth = Context.getIntWidth(T); 10193 10194 if (Value.isUnsigned() || Value.isNonNegative()) { 10195 if (T->isSignedIntegerOrEnumerationType()) 10196 --BitWidth; 10197 return Value.getActiveBits() <= BitWidth; 10198 } 10199 return Value.getMinSignedBits() <= BitWidth; 10200} 10201 10202// \brief Given an integral type, return the next larger integral type 10203// (or a NULL type of no such type exists). 10204static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 10205 // FIXME: Int128/UInt128 support, which also needs to be introduced into 10206 // enum checking below. 10207 assert(T->isIntegralType(Context) && "Integral type required!"); 10208 const unsigned NumTypes = 4; 10209 QualType SignedIntegralTypes[NumTypes] = { 10210 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 10211 }; 10212 QualType UnsignedIntegralTypes[NumTypes] = { 10213 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 10214 Context.UnsignedLongLongTy 10215 }; 10216 10217 unsigned BitWidth = Context.getTypeSize(T); 10218 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 10219 : UnsignedIntegralTypes; 10220 for (unsigned I = 0; I != NumTypes; ++I) 10221 if (Context.getTypeSize(Types[I]) > BitWidth) 10222 return Types[I]; 10223 10224 return QualType(); 10225} 10226 10227EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 10228 EnumConstantDecl *LastEnumConst, 10229 SourceLocation IdLoc, 10230 IdentifierInfo *Id, 10231 Expr *Val) { 10232 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10233 llvm::APSInt EnumVal(IntWidth); 10234 QualType EltTy; 10235 10236 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 10237 Val = 0; 10238 10239 if (Val) 10240 Val = DefaultLvalueConversion(Val).take(); 10241 10242 if (Val) { 10243 if (Enum->isDependentType() || Val->isTypeDependent()) 10244 EltTy = Context.DependentTy; 10245 else { 10246 SourceLocation ExpLoc; 10247 if (getLangOpts().CPlusPlus0x && Enum->isFixed() && 10248 !getLangOpts().MicrosoftMode) { 10249 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 10250 // constant-expression in the enumerator-definition shall be a converted 10251 // constant expression of the underlying type. 10252 EltTy = Enum->getIntegerType(); 10253 ExprResult Converted = 10254 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 10255 CCEK_Enumerator); 10256 if (Converted.isInvalid()) 10257 Val = 0; 10258 else 10259 Val = Converted.take(); 10260 } else if (!Val->isValueDependent() && 10261 !(Val = VerifyIntegerConstantExpression(Val, 10262 &EnumVal).take())) { 10263 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 10264 } else { 10265 if (Enum->isFixed()) { 10266 EltTy = Enum->getIntegerType(); 10267 10268 // In Obj-C and Microsoft mode, require the enumeration value to be 10269 // representable in the underlying type of the enumeration. In C++11, 10270 // we perform a non-narrowing conversion as part of converted constant 10271 // expression checking. 10272 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10273 if (getLangOpts().MicrosoftMode) { 10274 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 10275 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10276 } else 10277 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 10278 } else 10279 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10280 } else if (getLangOpts().CPlusPlus) { 10281 // C++11 [dcl.enum]p5: 10282 // If the underlying type is not fixed, the type of each enumerator 10283 // is the type of its initializing value: 10284 // - If an initializer is specified for an enumerator, the 10285 // initializing value has the same type as the expression. 10286 EltTy = Val->getType(); 10287 } else { 10288 // C99 6.7.2.2p2: 10289 // The expression that defines the value of an enumeration constant 10290 // shall be an integer constant expression that has a value 10291 // representable as an int. 10292 10293 // Complain if the value is not representable in an int. 10294 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 10295 Diag(IdLoc, diag::ext_enum_value_not_int) 10296 << EnumVal.toString(10) << Val->getSourceRange() 10297 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 10298 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 10299 // Force the type of the expression to 'int'. 10300 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 10301 } 10302 EltTy = Val->getType(); 10303 } 10304 } 10305 } 10306 } 10307 10308 if (!Val) { 10309 if (Enum->isDependentType()) 10310 EltTy = Context.DependentTy; 10311 else if (!LastEnumConst) { 10312 // C++0x [dcl.enum]p5: 10313 // If the underlying type is not fixed, the type of each enumerator 10314 // is the type of its initializing value: 10315 // - If no initializer is specified for the first enumerator, the 10316 // initializing value has an unspecified integral type. 10317 // 10318 // GCC uses 'int' for its unspecified integral type, as does 10319 // C99 6.7.2.2p3. 10320 if (Enum->isFixed()) { 10321 EltTy = Enum->getIntegerType(); 10322 } 10323 else { 10324 EltTy = Context.IntTy; 10325 } 10326 } else { 10327 // Assign the last value + 1. 10328 EnumVal = LastEnumConst->getInitVal(); 10329 ++EnumVal; 10330 EltTy = LastEnumConst->getType(); 10331 10332 // Check for overflow on increment. 10333 if (EnumVal < LastEnumConst->getInitVal()) { 10334 // C++0x [dcl.enum]p5: 10335 // If the underlying type is not fixed, the type of each enumerator 10336 // is the type of its initializing value: 10337 // 10338 // - Otherwise the type of the initializing value is the same as 10339 // the type of the initializing value of the preceding enumerator 10340 // unless the incremented value is not representable in that type, 10341 // in which case the type is an unspecified integral type 10342 // sufficient to contain the incremented value. If no such type 10343 // exists, the program is ill-formed. 10344 QualType T = getNextLargerIntegralType(Context, EltTy); 10345 if (T.isNull() || Enum->isFixed()) { 10346 // There is no integral type larger enough to represent this 10347 // value. Complain, then allow the value to wrap around. 10348 EnumVal = LastEnumConst->getInitVal(); 10349 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 10350 ++EnumVal; 10351 if (Enum->isFixed()) 10352 // When the underlying type is fixed, this is ill-formed. 10353 Diag(IdLoc, diag::err_enumerator_wrapped) 10354 << EnumVal.toString(10) 10355 << EltTy; 10356 else 10357 Diag(IdLoc, diag::warn_enumerator_too_large) 10358 << EnumVal.toString(10); 10359 } else { 10360 EltTy = T; 10361 } 10362 10363 // Retrieve the last enumerator's value, extent that type to the 10364 // type that is supposed to be large enough to represent the incremented 10365 // value, then increment. 10366 EnumVal = LastEnumConst->getInitVal(); 10367 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10368 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 10369 ++EnumVal; 10370 10371 // If we're not in C++, diagnose the overflow of enumerator values, 10372 // which in C99 means that the enumerator value is not representable in 10373 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 10374 // permits enumerator values that are representable in some larger 10375 // integral type. 10376 if (!getLangOpts().CPlusPlus && !T.isNull()) 10377 Diag(IdLoc, diag::warn_enum_value_overflow); 10378 } else if (!getLangOpts().CPlusPlus && 10379 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10380 // Enforce C99 6.7.2.2p2 even when we compute the next value. 10381 Diag(IdLoc, diag::ext_enum_value_not_int) 10382 << EnumVal.toString(10) << 1; 10383 } 10384 } 10385 } 10386 10387 if (!EltTy->isDependentType()) { 10388 // Make the enumerator value match the signedness and size of the 10389 // enumerator's type. 10390 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); 10391 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10392 } 10393 10394 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 10395 Val, EnumVal); 10396} 10397 10398 10399Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 10400 SourceLocation IdLoc, IdentifierInfo *Id, 10401 AttributeList *Attr, 10402 SourceLocation EqualLoc, Expr *Val) { 10403 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 10404 EnumConstantDecl *LastEnumConst = 10405 cast_or_null<EnumConstantDecl>(lastEnumConst); 10406 10407 // The scope passed in may not be a decl scope. Zip up the scope tree until 10408 // we find one that is. 10409 S = getNonFieldDeclScope(S); 10410 10411 // Verify that there isn't already something declared with this name in this 10412 // scope. 10413 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 10414 ForRedeclaration); 10415 if (PrevDecl && PrevDecl->isTemplateParameter()) { 10416 // Maybe we will complain about the shadowed template parameter. 10417 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 10418 // Just pretend that we didn't see the previous declaration. 10419 PrevDecl = 0; 10420 } 10421 10422 if (PrevDecl) { 10423 // When in C++, we may get a TagDecl with the same name; in this case the 10424 // enum constant will 'hide' the tag. 10425 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 10426 "Received TagDecl when not in C++!"); 10427 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 10428 if (isa<EnumConstantDecl>(PrevDecl)) 10429 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 10430 else 10431 Diag(IdLoc, diag::err_redefinition) << Id; 10432 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 10433 return 0; 10434 } 10435 } 10436 10437 // C++ [class.mem]p15: 10438 // If T is the name of a class, then each of the following shall have a name 10439 // different from T: 10440 // - every enumerator of every member of class T that is an unscoped 10441 // enumerated type 10442 if (CXXRecordDecl *Record 10443 = dyn_cast<CXXRecordDecl>( 10444 TheEnumDecl->getDeclContext()->getRedeclContext())) 10445 if (!TheEnumDecl->isScoped() && 10446 Record->getIdentifier() && Record->getIdentifier() == Id) 10447 Diag(IdLoc, diag::err_member_name_of_class) << Id; 10448 10449 EnumConstantDecl *New = 10450 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 10451 10452 if (New) { 10453 // Process attributes. 10454 if (Attr) ProcessDeclAttributeList(S, New, Attr); 10455 10456 // Register this decl in the current scope stack. 10457 New->setAccess(TheEnumDecl->getAccess()); 10458 PushOnScopeChains(New, S); 10459 } 10460 10461 ActOnDocumentableDecl(New); 10462 10463 return New; 10464} 10465 10466// Emits a warning if every element in the enum is the same value and if 10467// every element is initialized with a integer or boolean literal. 10468static void CheckForUniqueEnumValues(Sema &S, Decl **Elements, 10469 unsigned NumElements, EnumDecl *Enum, 10470 QualType EnumType) { 10471 if (S.Diags.getDiagnosticLevel(diag::warn_identical_enum_values, 10472 Enum->getLocation()) == 10473 DiagnosticsEngine::Ignored) 10474 return; 10475 10476 if (NumElements < 2) 10477 return; 10478 10479 if (!Enum->getIdentifier()) 10480 return; 10481 10482 llvm::APSInt FirstVal; 10483 10484 for (unsigned i = 0; i != NumElements; ++i) { 10485 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10486 if (!ECD) 10487 return; 10488 10489 Expr *InitExpr = ECD->getInitExpr(); 10490 if (!InitExpr) 10491 return; 10492 InitExpr = InitExpr->IgnoreImpCasts(); 10493 if (!isa<IntegerLiteral>(InitExpr) && !isa<CXXBoolLiteralExpr>(InitExpr)) 10494 return; 10495 10496 if (i == 0) { 10497 FirstVal = ECD->getInitVal(); 10498 continue; 10499 } 10500 10501 if (!llvm::APSInt::isSameValue(FirstVal, ECD->getInitVal())) 10502 return; 10503 } 10504 10505 S.Diag(Enum->getLocation(), diag::warn_identical_enum_values) 10506 << EnumType << FirstVal.toString(10) 10507 << Enum->getSourceRange(); 10508 10509 EnumConstantDecl *Last = cast<EnumConstantDecl>(Elements[NumElements - 1]), 10510 *Next = cast<EnumConstantDecl>(Elements[NumElements - 2]); 10511 10512 S.Diag(Last->getLocation(), diag::note_identical_enum_values) 10513 << FixItHint::CreateReplacement(Last->getInitExpr()->getSourceRange(), 10514 Next->getName()); 10515} 10516 10517void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 10518 SourceLocation RBraceLoc, Decl *EnumDeclX, 10519 Decl **Elements, unsigned NumElements, 10520 Scope *S, AttributeList *Attr) { 10521 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 10522 QualType EnumType = Context.getTypeDeclType(Enum); 10523 10524 if (Attr) 10525 ProcessDeclAttributeList(S, Enum, Attr); 10526 10527 if (Enum->isDependentType()) { 10528 for (unsigned i = 0; i != NumElements; ++i) { 10529 EnumConstantDecl *ECD = 10530 cast_or_null<EnumConstantDecl>(Elements[i]); 10531 if (!ECD) continue; 10532 10533 ECD->setType(EnumType); 10534 } 10535 10536 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 10537 return; 10538 } 10539 10540 // TODO: If the result value doesn't fit in an int, it must be a long or long 10541 // long value. ISO C does not support this, but GCC does as an extension, 10542 // emit a warning. 10543 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10544 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 10545 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 10546 10547 // Verify that all the values are okay, compute the size of the values, and 10548 // reverse the list. 10549 unsigned NumNegativeBits = 0; 10550 unsigned NumPositiveBits = 0; 10551 10552 // Keep track of whether all elements have type int. 10553 bool AllElementsInt = true; 10554 10555 for (unsigned i = 0; i != NumElements; ++i) { 10556 EnumConstantDecl *ECD = 10557 cast_or_null<EnumConstantDecl>(Elements[i]); 10558 if (!ECD) continue; // Already issued a diagnostic. 10559 10560 const llvm::APSInt &InitVal = ECD->getInitVal(); 10561 10562 // Keep track of the size of positive and negative values. 10563 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 10564 NumPositiveBits = std::max(NumPositiveBits, 10565 (unsigned)InitVal.getActiveBits()); 10566 else 10567 NumNegativeBits = std::max(NumNegativeBits, 10568 (unsigned)InitVal.getMinSignedBits()); 10569 10570 // Keep track of whether every enum element has type int (very commmon). 10571 if (AllElementsInt) 10572 AllElementsInt = ECD->getType() == Context.IntTy; 10573 } 10574 10575 // Figure out the type that should be used for this enum. 10576 QualType BestType; 10577 unsigned BestWidth; 10578 10579 // C++0x N3000 [conv.prom]p3: 10580 // An rvalue of an unscoped enumeration type whose underlying 10581 // type is not fixed can be converted to an rvalue of the first 10582 // of the following types that can represent all the values of 10583 // the enumeration: int, unsigned int, long int, unsigned long 10584 // int, long long int, or unsigned long long int. 10585 // C99 6.4.4.3p2: 10586 // An identifier declared as an enumeration constant has type int. 10587 // The C99 rule is modified by a gcc extension 10588 QualType BestPromotionType; 10589 10590 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 10591 // -fshort-enums is the equivalent to specifying the packed attribute on all 10592 // enum definitions. 10593 if (LangOpts.ShortEnums) 10594 Packed = true; 10595 10596 if (Enum->isFixed()) { 10597 BestType = Enum->getIntegerType(); 10598 if (BestType->isPromotableIntegerType()) 10599 BestPromotionType = Context.getPromotedIntegerType(BestType); 10600 else 10601 BestPromotionType = BestType; 10602 // We don't need to set BestWidth, because BestType is going to be the type 10603 // of the enumerators, but we do anyway because otherwise some compilers 10604 // warn that it might be used uninitialized. 10605 BestWidth = CharWidth; 10606 } 10607 else if (NumNegativeBits) { 10608 // If there is a negative value, figure out the smallest integer type (of 10609 // int/long/longlong) that fits. 10610 // If it's packed, check also if it fits a char or a short. 10611 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 10612 BestType = Context.SignedCharTy; 10613 BestWidth = CharWidth; 10614 } else if (Packed && NumNegativeBits <= ShortWidth && 10615 NumPositiveBits < ShortWidth) { 10616 BestType = Context.ShortTy; 10617 BestWidth = ShortWidth; 10618 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 10619 BestType = Context.IntTy; 10620 BestWidth = IntWidth; 10621 } else { 10622 BestWidth = Context.getTargetInfo().getLongWidth(); 10623 10624 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 10625 BestType = Context.LongTy; 10626 } else { 10627 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10628 10629 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 10630 Diag(Enum->getLocation(), diag::warn_enum_too_large); 10631 BestType = Context.LongLongTy; 10632 } 10633 } 10634 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 10635 } else { 10636 // If there is no negative value, figure out the smallest type that fits 10637 // all of the enumerator values. 10638 // If it's packed, check also if it fits a char or a short. 10639 if (Packed && NumPositiveBits <= CharWidth) { 10640 BestType = Context.UnsignedCharTy; 10641 BestPromotionType = Context.IntTy; 10642 BestWidth = CharWidth; 10643 } else if (Packed && NumPositiveBits <= ShortWidth) { 10644 BestType = Context.UnsignedShortTy; 10645 BestPromotionType = Context.IntTy; 10646 BestWidth = ShortWidth; 10647 } else if (NumPositiveBits <= IntWidth) { 10648 BestType = Context.UnsignedIntTy; 10649 BestWidth = IntWidth; 10650 BestPromotionType 10651 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10652 ? Context.UnsignedIntTy : Context.IntTy; 10653 } else if (NumPositiveBits <= 10654 (BestWidth = Context.getTargetInfo().getLongWidth())) { 10655 BestType = Context.UnsignedLongTy; 10656 BestPromotionType 10657 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10658 ? Context.UnsignedLongTy : Context.LongTy; 10659 } else { 10660 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10661 assert(NumPositiveBits <= BestWidth && 10662 "How could an initializer get larger than ULL?"); 10663 BestType = Context.UnsignedLongLongTy; 10664 BestPromotionType 10665 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10666 ? Context.UnsignedLongLongTy : Context.LongLongTy; 10667 } 10668 } 10669 10670 // Loop over all of the enumerator constants, changing their types to match 10671 // the type of the enum if needed. 10672 for (unsigned i = 0; i != NumElements; ++i) { 10673 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10674 if (!ECD) continue; // Already issued a diagnostic. 10675 10676 // Standard C says the enumerators have int type, but we allow, as an 10677 // extension, the enumerators to be larger than int size. If each 10678 // enumerator value fits in an int, type it as an int, otherwise type it the 10679 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 10680 // that X has type 'int', not 'unsigned'. 10681 10682 // Determine whether the value fits into an int. 10683 llvm::APSInt InitVal = ECD->getInitVal(); 10684 10685 // If it fits into an integer type, force it. Otherwise force it to match 10686 // the enum decl type. 10687 QualType NewTy; 10688 unsigned NewWidth; 10689 bool NewSign; 10690 if (!getLangOpts().CPlusPlus && 10691 !Enum->isFixed() && 10692 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 10693 NewTy = Context.IntTy; 10694 NewWidth = IntWidth; 10695 NewSign = true; 10696 } else if (ECD->getType() == BestType) { 10697 // Already the right type! 10698 if (getLangOpts().CPlusPlus) 10699 // C++ [dcl.enum]p4: Following the closing brace of an 10700 // enum-specifier, each enumerator has the type of its 10701 // enumeration. 10702 ECD->setType(EnumType); 10703 continue; 10704 } else { 10705 NewTy = BestType; 10706 NewWidth = BestWidth; 10707 NewSign = BestType->isSignedIntegerOrEnumerationType(); 10708 } 10709 10710 // Adjust the APSInt value. 10711 InitVal = InitVal.extOrTrunc(NewWidth); 10712 InitVal.setIsSigned(NewSign); 10713 ECD->setInitVal(InitVal); 10714 10715 // Adjust the Expr initializer and type. 10716 if (ECD->getInitExpr() && 10717 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10718 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10719 CK_IntegralCast, 10720 ECD->getInitExpr(), 10721 /*base paths*/ 0, 10722 VK_RValue)); 10723 if (getLangOpts().CPlusPlus) 10724 // C++ [dcl.enum]p4: Following the closing brace of an 10725 // enum-specifier, each enumerator has the type of its 10726 // enumeration. 10727 ECD->setType(EnumType); 10728 else 10729 ECD->setType(NewTy); 10730 } 10731 10732 Enum->completeDefinition(BestType, BestPromotionType, 10733 NumPositiveBits, NumNegativeBits); 10734 10735 // If we're declaring a function, ensure this decl isn't forgotten about - 10736 // it needs to go into the function scope. 10737 if (InFunctionDeclarator) 10738 DeclsInPrototypeScope.push_back(Enum); 10739 10740 CheckForUniqueEnumValues(*this, Elements, NumElements, Enum, EnumType); 10741} 10742 10743Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10744 SourceLocation StartLoc, 10745 SourceLocation EndLoc) { 10746 StringLiteral *AsmString = cast<StringLiteral>(expr); 10747 10748 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10749 AsmString, StartLoc, 10750 EndLoc); 10751 CurContext->addDecl(New); 10752 return New; 10753} 10754 10755DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10756 SourceLocation ImportLoc, 10757 ModuleIdPath Path) { 10758 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10759 Module::AllVisible, 10760 /*IsIncludeDirective=*/false); 10761 if (!Mod) 10762 return true; 10763 10764 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10765 Module *ModCheck = Mod; 10766 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10767 // If we've run out of module parents, just drop the remaining identifiers. 10768 // We need the length to be consistent. 10769 if (!ModCheck) 10770 break; 10771 ModCheck = ModCheck->Parent; 10772 10773 IdentifierLocs.push_back(Path[I].second); 10774 } 10775 10776 ImportDecl *Import = ImportDecl::Create(Context, 10777 Context.getTranslationUnitDecl(), 10778 AtLoc.isValid()? AtLoc : ImportLoc, 10779 Mod, IdentifierLocs); 10780 Context.getTranslationUnitDecl()->addDecl(Import); 10781 return Import; 10782} 10783 10784void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name, 10785 IdentifierInfo* AliasName, 10786 SourceLocation PragmaLoc, 10787 SourceLocation NameLoc, 10788 SourceLocation AliasNameLoc) { 10789 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, 10790 LookupOrdinaryName); 10791 AsmLabelAttr *Attr = 10792 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName()); 10793 10794 if (PrevDecl) 10795 PrevDecl->addAttr(Attr); 10796 else 10797 (void)ExtnameUndeclaredIdentifiers.insert( 10798 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr)); 10799} 10800 10801void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10802 SourceLocation PragmaLoc, 10803 SourceLocation NameLoc) { 10804 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10805 10806 if (PrevDecl) { 10807 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10808 } else { 10809 (void)WeakUndeclaredIdentifiers.insert( 10810 std::pair<IdentifierInfo*,WeakInfo> 10811 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10812 } 10813} 10814 10815void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10816 IdentifierInfo* AliasName, 10817 SourceLocation PragmaLoc, 10818 SourceLocation NameLoc, 10819 SourceLocation AliasNameLoc) { 10820 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10821 LookupOrdinaryName); 10822 WeakInfo W = WeakInfo(Name, NameLoc); 10823 10824 if (PrevDecl) { 10825 if (!PrevDecl->hasAttr<AliasAttr>()) 10826 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10827 DeclApplyPragmaWeak(TUScope, ND, W); 10828 } else { 10829 (void)WeakUndeclaredIdentifiers.insert( 10830 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10831 } 10832} 10833 10834Decl *Sema::getObjCDeclContext() const { 10835 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10836} 10837 10838AvailabilityResult Sema::getCurContextAvailability() const { 10839 const Decl *D = cast<Decl>(getCurLexicalContext()); 10840 // A category implicitly has the availability of the interface. 10841 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10842 D = CatD->getClassInterface(); 10843 10844 return D->getAvailability(); 10845} 10846