SemaDecl.cpp revision e5e8f4d2db48ec21f537fd6452276c1fe26bc726
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->getTypeQualifiers() & Qualifiers::Const; 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->getTypeQualifiers() & Qualifiers::Const; 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 // If we see "T var();" at block scope, where T is a class type, it is 5249 // probably an attempt to initialize a variable, not a function declaration. 5250 // We don't catch this case earlier, since there is no ambiguity here. 5251 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 5252 CurContext->isFunctionOrMethod() && 5253 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 5254 D.getDeclSpec().getStorageClassSpecAsWritten() 5255 == DeclSpec::SCS_unspecified) { 5256 QualType T = R->getAs<FunctionType>()->getResultType(); 5257 DeclaratorChunk &C = D.getTypeObject(0); 5258 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 5259 !C.Fun.hasTrailingReturnType() && 5260 C.Fun.getExceptionSpecType() == EST_None) { 5261 SourceRange ParenRange(C.Loc, C.EndLoc); 5262 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 5263 5264 // If the declaration looks like: 5265 // T var1, 5266 // f(); 5267 // and name lookup finds a function named 'f', then the ',' was 5268 // probably intended to be a ';'. 5269 if (!D.isFirstDeclarator() && D.getIdentifier()) { 5270 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 5271 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 5272 if (Comma.getFileID() != Name.getFileID() || 5273 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 5274 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 5275 LookupOrdinaryName); 5276 if (LookupName(Result, S)) 5277 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 5278 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 5279 } 5280 } 5281 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 5282 // Empty parens mean value-initialization, and no parens mean default 5283 // initialization. These are equivalent if the default constructor is 5284 // user-provided, or if zero-initialization is a no-op. 5285 if (RD && RD->hasDefinition() && 5286 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 5287 Diag(C.Loc, diag::note_empty_parens_default_ctor) 5288 << FixItHint::CreateRemoval(ParenRange); 5289 else { 5290 std::string Init = getFixItZeroInitializerForType(T); 5291 if (Init.empty() && LangOpts.CPlusPlus0x) 5292 Init = "{}"; 5293 if (!Init.empty()) 5294 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5295 << FixItHint::CreateReplacement(ParenRange, Init); 5296 } 5297 } 5298 } 5299 5300 // C++ [dcl.fct.spec]p5: 5301 // The virtual specifier shall only be used in declarations of 5302 // nonstatic class member functions that appear within a 5303 // member-specification of a class declaration; see 10.3. 5304 // 5305 if (isVirtual && !NewFD->isInvalidDecl()) { 5306 if (!isVirtualOkay) { 5307 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5308 diag::err_virtual_non_function); 5309 } else if (!CurContext->isRecord()) { 5310 // 'virtual' was specified outside of the class. 5311 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5312 diag::err_virtual_out_of_class) 5313 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5314 } else if (NewFD->getDescribedFunctionTemplate()) { 5315 // C++ [temp.mem]p3: 5316 // A member function template shall not be virtual. 5317 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5318 diag::err_virtual_member_function_template) 5319 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5320 } else { 5321 // Okay: Add virtual to the method. 5322 NewFD->setVirtualAsWritten(true); 5323 } 5324 } 5325 5326 // C++ [dcl.fct.spec]p3: 5327 // The inline specifier shall not appear on a block scope function 5328 // declaration. 5329 if (isInline && !NewFD->isInvalidDecl()) { 5330 if (CurContext->isFunctionOrMethod()) { 5331 // 'inline' is not allowed on block scope function declaration. 5332 Diag(D.getDeclSpec().getInlineSpecLoc(), 5333 diag::err_inline_declaration_block_scope) << Name 5334 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5335 } 5336 } 5337 5338 // C++ [dcl.fct.spec]p6: 5339 // The explicit specifier shall be used only in the declaration of a 5340 // constructor or conversion function within its class definition; 5341 // see 12.3.1 and 12.3.2. 5342 if (isExplicit && !NewFD->isInvalidDecl()) { 5343 if (!CurContext->isRecord()) { 5344 // 'explicit' was specified outside of the class. 5345 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5346 diag::err_explicit_out_of_class) 5347 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5348 } else if (!isa<CXXConstructorDecl>(NewFD) && 5349 !isa<CXXConversionDecl>(NewFD)) { 5350 // 'explicit' was specified on a function that wasn't a constructor 5351 // or conversion function. 5352 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5353 diag::err_explicit_non_ctor_or_conv_function) 5354 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5355 } 5356 } 5357 5358 if (isConstexpr) { 5359 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5360 // are implicitly inline. 5361 NewFD->setImplicitlyInline(); 5362 5363 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5364 // be either constructors or to return a literal type. Therefore, 5365 // destructors cannot be declared constexpr. 5366 if (isa<CXXDestructorDecl>(NewFD)) 5367 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5368 } 5369 5370 // If __module_private__ was specified, mark the function accordingly. 5371 if (D.getDeclSpec().isModulePrivateSpecified()) { 5372 if (isFunctionTemplateSpecialization) { 5373 SourceLocation ModulePrivateLoc 5374 = D.getDeclSpec().getModulePrivateSpecLoc(); 5375 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5376 << 0 5377 << FixItHint::CreateRemoval(ModulePrivateLoc); 5378 } else { 5379 NewFD->setModulePrivate(); 5380 if (FunctionTemplate) 5381 FunctionTemplate->setModulePrivate(); 5382 } 5383 } 5384 5385 if (isFriend) { 5386 // For now, claim that the objects have no previous declaration. 5387 if (FunctionTemplate) { 5388 FunctionTemplate->setObjectOfFriendDecl(false); 5389 FunctionTemplate->setAccess(AS_public); 5390 } 5391 NewFD->setObjectOfFriendDecl(false); 5392 NewFD->setAccess(AS_public); 5393 } 5394 5395 // If a function is defined as defaulted or deleted, mark it as such now. 5396 switch (D.getFunctionDefinitionKind()) { 5397 case FDK_Declaration: 5398 case FDK_Definition: 5399 break; 5400 5401 case FDK_Defaulted: 5402 NewFD->setDefaulted(); 5403 break; 5404 5405 case FDK_Deleted: 5406 NewFD->setDeletedAsWritten(); 5407 break; 5408 } 5409 5410 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5411 D.isFunctionDefinition()) { 5412 // C++ [class.mfct]p2: 5413 // A member function may be defined (8.4) in its class definition, in 5414 // which case it is an inline member function (7.1.2) 5415 NewFD->setImplicitlyInline(); 5416 } 5417 5418 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5419 !CurContext->isRecord()) { 5420 // C++ [class.static]p1: 5421 // A data or function member of a class may be declared static 5422 // in a class definition, in which case it is a static member of 5423 // the class. 5424 5425 // Complain about the 'static' specifier if it's on an out-of-line 5426 // member function definition. 5427 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5428 diag::err_static_out_of_line) 5429 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5430 } 5431 } 5432 5433 // Filter out previous declarations that don't match the scope. 5434 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5435 isExplicitSpecialization || 5436 isFunctionTemplateSpecialization); 5437 5438 // Handle GNU asm-label extension (encoded as an attribute). 5439 if (Expr *E = (Expr*) D.getAsmLabel()) { 5440 // The parser guarantees this is a string. 5441 StringLiteral *SE = cast<StringLiteral>(E); 5442 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5443 SE->getString())); 5444 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 5445 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 5446 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); 5447 if (I != ExtnameUndeclaredIdentifiers.end()) { 5448 NewFD->addAttr(I->second); 5449 ExtnameUndeclaredIdentifiers.erase(I); 5450 } 5451 } 5452 5453 // Copy the parameter declarations from the declarator D to the function 5454 // declaration NewFD, if they are available. First scavenge them into Params. 5455 SmallVector<ParmVarDecl*, 16> Params; 5456 if (D.isFunctionDeclarator()) { 5457 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5458 5459 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5460 // function that takes no arguments, not a function that takes a 5461 // single void argument. 5462 // We let through "const void" here because Sema::GetTypeForDeclarator 5463 // already checks for that case. 5464 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5465 FTI.ArgInfo[0].Param && 5466 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5467 // Empty arg list, don't push any params. 5468 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5469 5470 // In C++, the empty parameter-type-list must be spelled "void"; a 5471 // typedef of void is not permitted. 5472 if (getLangOpts().CPlusPlus && 5473 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5474 bool IsTypeAlias = false; 5475 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5476 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5477 else if (const TemplateSpecializationType *TST = 5478 Param->getType()->getAs<TemplateSpecializationType>()) 5479 IsTypeAlias = TST->isTypeAlias(); 5480 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5481 << IsTypeAlias; 5482 } 5483 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5484 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5485 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5486 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5487 Param->setDeclContext(NewFD); 5488 Params.push_back(Param); 5489 5490 if (Param->isInvalidDecl()) 5491 NewFD->setInvalidDecl(); 5492 } 5493 } 5494 5495 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5496 // When we're declaring a function with a typedef, typeof, etc as in the 5497 // following example, we'll need to synthesize (unnamed) 5498 // parameters for use in the declaration. 5499 // 5500 // @code 5501 // typedef void fn(int); 5502 // fn f; 5503 // @endcode 5504 5505 // Synthesize a parameter for each argument type. 5506 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5507 AE = FT->arg_type_end(); AI != AE; ++AI) { 5508 ParmVarDecl *Param = 5509 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5510 Param->setScopeInfo(0, Params.size()); 5511 Params.push_back(Param); 5512 } 5513 } else { 5514 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5515 "Should not need args for typedef of non-prototype fn"); 5516 } 5517 5518 // Finally, we know we have the right number of parameters, install them. 5519 NewFD->setParams(Params); 5520 5521 // Find all anonymous symbols defined during the declaration of this function 5522 // and add to NewFD. This lets us track decls such 'enum Y' in: 5523 // 5524 // void f(enum Y {AA} x) {} 5525 // 5526 // which would otherwise incorrectly end up in the translation unit scope. 5527 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope); 5528 DeclsInPrototypeScope.clear(); 5529 5530 // Process the non-inheritable attributes on this declaration. 5531 ProcessDeclAttributes(S, NewFD, D, 5532 /*NonInheritable=*/true, /*Inheritable=*/false); 5533 5534 // Functions returning a variably modified type violate C99 6.7.5.2p2 5535 // because all functions have linkage. 5536 if (!NewFD->isInvalidDecl() && 5537 NewFD->getResultType()->isVariablyModifiedType()) { 5538 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5539 NewFD->setInvalidDecl(); 5540 } 5541 5542 // Handle attributes. 5543 ProcessDeclAttributes(S, NewFD, D, 5544 /*NonInheritable=*/false, /*Inheritable=*/true); 5545 5546 if (!getLangOpts().CPlusPlus) { 5547 // Perform semantic checking on the function declaration. 5548 bool isExplicitSpecialization=false; 5549 if (!NewFD->isInvalidDecl()) { 5550 if (NewFD->isMain()) 5551 CheckMain(NewFD, D.getDeclSpec()); 5552 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5553 isExplicitSpecialization)); 5554 } 5555 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5556 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5557 "previous declaration set still overloaded"); 5558 } else { 5559 // If the declarator is a template-id, translate the parser's template 5560 // argument list into our AST format. 5561 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5562 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5563 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5564 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5565 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5566 TemplateId->getTemplateArgs(), 5567 TemplateId->NumArgs); 5568 translateTemplateArguments(TemplateArgsPtr, 5569 TemplateArgs); 5570 TemplateArgsPtr.release(); 5571 5572 HasExplicitTemplateArgs = true; 5573 5574 if (NewFD->isInvalidDecl()) { 5575 HasExplicitTemplateArgs = false; 5576 } else if (FunctionTemplate) { 5577 // Function template with explicit template arguments. 5578 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5579 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5580 5581 HasExplicitTemplateArgs = false; 5582 } else if (!isFunctionTemplateSpecialization && 5583 !D.getDeclSpec().isFriendSpecified()) { 5584 // We have encountered something that the user meant to be a 5585 // specialization (because it has explicitly-specified template 5586 // arguments) but that was not introduced with a "template<>" (or had 5587 // too few of them). 5588 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5589 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5590 << FixItHint::CreateInsertion( 5591 D.getDeclSpec().getLocStart(), 5592 "template<> "); 5593 isFunctionTemplateSpecialization = true; 5594 } else { 5595 // "friend void foo<>(int);" is an implicit specialization decl. 5596 isFunctionTemplateSpecialization = true; 5597 } 5598 } else if (isFriend && isFunctionTemplateSpecialization) { 5599 // This combination is only possible in a recovery case; the user 5600 // wrote something like: 5601 // template <> friend void foo(int); 5602 // which we're recovering from as if the user had written: 5603 // friend void foo<>(int); 5604 // Go ahead and fake up a template id. 5605 HasExplicitTemplateArgs = true; 5606 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5607 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5608 } 5609 5610 // If it's a friend (and only if it's a friend), it's possible 5611 // that either the specialized function type or the specialized 5612 // template is dependent, and therefore matching will fail. In 5613 // this case, don't check the specialization yet. 5614 bool InstantiationDependent = false; 5615 if (isFunctionTemplateSpecialization && isFriend && 5616 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5617 TemplateSpecializationType::anyDependentTemplateArguments( 5618 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5619 InstantiationDependent))) { 5620 assert(HasExplicitTemplateArgs && 5621 "friend function specialization without template args"); 5622 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5623 Previous)) 5624 NewFD->setInvalidDecl(); 5625 } else if (isFunctionTemplateSpecialization) { 5626 if (CurContext->isDependentContext() && CurContext->isRecord() 5627 && !isFriend) { 5628 isDependentClassScopeExplicitSpecialization = true; 5629 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ? 5630 diag::ext_function_specialization_in_class : 5631 diag::err_function_specialization_in_class) 5632 << NewFD->getDeclName(); 5633 } else if (CheckFunctionTemplateSpecialization(NewFD, 5634 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5635 Previous)) 5636 NewFD->setInvalidDecl(); 5637 5638 // C++ [dcl.stc]p1: 5639 // A storage-class-specifier shall not be specified in an explicit 5640 // specialization (14.7.3) 5641 if (SC != SC_None) { 5642 if (SC != NewFD->getStorageClass()) 5643 Diag(NewFD->getLocation(), 5644 diag::err_explicit_specialization_inconsistent_storage_class) 5645 << SC 5646 << FixItHint::CreateRemoval( 5647 D.getDeclSpec().getStorageClassSpecLoc()); 5648 5649 else 5650 Diag(NewFD->getLocation(), 5651 diag::ext_explicit_specialization_storage_class) 5652 << FixItHint::CreateRemoval( 5653 D.getDeclSpec().getStorageClassSpecLoc()); 5654 } 5655 5656 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5657 if (CheckMemberSpecialization(NewFD, Previous)) 5658 NewFD->setInvalidDecl(); 5659 } 5660 5661 // Perform semantic checking on the function declaration. 5662 if (!isDependentClassScopeExplicitSpecialization) { 5663 if (NewFD->isInvalidDecl()) { 5664 // If this is a class member, mark the class invalid immediately. 5665 // This avoids some consistency errors later. 5666 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5667 methodDecl->getParent()->setInvalidDecl(); 5668 } else { 5669 if (NewFD->isMain()) 5670 CheckMain(NewFD, D.getDeclSpec()); 5671 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5672 isExplicitSpecialization)); 5673 } 5674 } 5675 5676 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5677 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5678 "previous declaration set still overloaded"); 5679 5680 NamedDecl *PrincipalDecl = (FunctionTemplate 5681 ? cast<NamedDecl>(FunctionTemplate) 5682 : NewFD); 5683 5684 if (isFriend && D.isRedeclaration()) { 5685 AccessSpecifier Access = AS_public; 5686 if (!NewFD->isInvalidDecl()) 5687 Access = NewFD->getPreviousDecl()->getAccess(); 5688 5689 NewFD->setAccess(Access); 5690 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5691 5692 PrincipalDecl->setObjectOfFriendDecl(true); 5693 } 5694 5695 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5696 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5697 PrincipalDecl->setNonMemberOperator(); 5698 5699 // If we have a function template, check the template parameter 5700 // list. This will check and merge default template arguments. 5701 if (FunctionTemplate) { 5702 FunctionTemplateDecl *PrevTemplate = 5703 FunctionTemplate->getPreviousDecl(); 5704 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5705 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5706 D.getDeclSpec().isFriendSpecified() 5707 ? (D.isFunctionDefinition() 5708 ? TPC_FriendFunctionTemplateDefinition 5709 : TPC_FriendFunctionTemplate) 5710 : (D.getCXXScopeSpec().isSet() && 5711 DC && DC->isRecord() && 5712 DC->isDependentContext()) 5713 ? TPC_ClassTemplateMember 5714 : TPC_FunctionTemplate); 5715 } 5716 5717 if (NewFD->isInvalidDecl()) { 5718 // Ignore all the rest of this. 5719 } else if (!D.isRedeclaration()) { 5720 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5721 AddToScope }; 5722 // Fake up an access specifier if it's supposed to be a class member. 5723 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5724 NewFD->setAccess(AS_public); 5725 5726 // Qualified decls generally require a previous declaration. 5727 if (D.getCXXScopeSpec().isSet()) { 5728 // ...with the major exception of templated-scope or 5729 // dependent-scope friend declarations. 5730 5731 // TODO: we currently also suppress this check in dependent 5732 // contexts because (1) the parameter depth will be off when 5733 // matching friend templates and (2) we might actually be 5734 // selecting a friend based on a dependent factor. But there 5735 // are situations where these conditions don't apply and we 5736 // can actually do this check immediately. 5737 if (isFriend && 5738 (TemplateParamLists.size() || 5739 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5740 CurContext->isDependentContext())) { 5741 // ignore these 5742 } else { 5743 // The user tried to provide an out-of-line definition for a 5744 // function that is a member of a class or namespace, but there 5745 // was no such member function declared (C++ [class.mfct]p2, 5746 // C++ [namespace.memdef]p2). For example: 5747 // 5748 // class X { 5749 // void f() const; 5750 // }; 5751 // 5752 // void X::f() { } // ill-formed 5753 // 5754 // Complain about this problem, and attempt to suggest close 5755 // matches (e.g., those that differ only in cv-qualifiers and 5756 // whether the parameter types are references). 5757 5758 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5759 NewFD, 5760 ExtraArgs)) { 5761 AddToScope = ExtraArgs.AddToScope; 5762 return Result; 5763 } 5764 } 5765 5766 // Unqualified local friend declarations are required to resolve 5767 // to something. 5768 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5769 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5770 NewFD, 5771 ExtraArgs)) { 5772 AddToScope = ExtraArgs.AddToScope; 5773 return Result; 5774 } 5775 } 5776 5777 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5778 !isFriend && !isFunctionTemplateSpecialization && 5779 !isExplicitSpecialization) { 5780 // An out-of-line member function declaration must also be a 5781 // definition (C++ [dcl.meaning]p1). 5782 // Note that this is not the case for explicit specializations of 5783 // function templates or member functions of class templates, per 5784 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5785 // extension for compatibility with old SWIG code which likes to 5786 // generate them. 5787 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5788 << D.getCXXScopeSpec().getRange(); 5789 } 5790 } 5791 5792 AddKnownFunctionAttributes(NewFD); 5793 5794 if (NewFD->hasAttr<OverloadableAttr>() && 5795 !NewFD->getType()->getAs<FunctionProtoType>()) { 5796 Diag(NewFD->getLocation(), 5797 diag::err_attribute_overloadable_no_prototype) 5798 << NewFD; 5799 5800 // Turn this into a variadic function with no parameters. 5801 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5802 FunctionProtoType::ExtProtoInfo EPI; 5803 EPI.Variadic = true; 5804 EPI.ExtInfo = FT->getExtInfo(); 5805 5806 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5807 NewFD->setType(R); 5808 } 5809 5810 // If there's a #pragma GCC visibility in scope, and this isn't a class 5811 // member, set the visibility of this function. 5812 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5813 AddPushedVisibilityAttribute(NewFD); 5814 5815 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5816 // marking the function. 5817 AddCFAuditedAttribute(NewFD); 5818 5819 // If this is a locally-scoped extern C function, update the 5820 // map of such names. 5821 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5822 && !NewFD->isInvalidDecl()) 5823 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5824 5825 // Set this FunctionDecl's range up to the right paren. 5826 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5827 5828 if (getLangOpts().CPlusPlus) { 5829 if (FunctionTemplate) { 5830 if (NewFD->isInvalidDecl()) 5831 FunctionTemplate->setInvalidDecl(); 5832 return FunctionTemplate; 5833 } 5834 } 5835 5836 // OpenCL v1.2 s6.8 static is invalid for kernel functions. 5837 if ((getLangOpts().OpenCLVersion >= 120) 5838 && NewFD->hasAttr<OpenCLKernelAttr>() 5839 && (SC == SC_Static)) { 5840 Diag(D.getIdentifierLoc(), diag::err_static_kernel); 5841 D.setInvalidType(); 5842 } 5843 5844 MarkUnusedFileScopedDecl(NewFD); 5845 5846 if (getLangOpts().CUDA) 5847 if (IdentifierInfo *II = NewFD->getIdentifier()) 5848 if (!NewFD->isInvalidDecl() && 5849 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5850 if (II->isStr("cudaConfigureCall")) { 5851 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5852 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5853 5854 Context.setcudaConfigureCallDecl(NewFD); 5855 } 5856 } 5857 5858 // Here we have an function template explicit specialization at class scope. 5859 // The actually specialization will be postponed to template instatiation 5860 // time via the ClassScopeFunctionSpecializationDecl node. 5861 if (isDependentClassScopeExplicitSpecialization) { 5862 ClassScopeFunctionSpecializationDecl *NewSpec = 5863 ClassScopeFunctionSpecializationDecl::Create( 5864 Context, CurContext, SourceLocation(), 5865 cast<CXXMethodDecl>(NewFD), 5866 HasExplicitTemplateArgs, TemplateArgs); 5867 CurContext->addDecl(NewSpec); 5868 AddToScope = false; 5869 } 5870 5871 return NewFD; 5872} 5873 5874/// \brief Perform semantic checking of a new function declaration. 5875/// 5876/// Performs semantic analysis of the new function declaration 5877/// NewFD. This routine performs all semantic checking that does not 5878/// require the actual declarator involved in the declaration, and is 5879/// used both for the declaration of functions as they are parsed 5880/// (called via ActOnDeclarator) and for the declaration of functions 5881/// that have been instantiated via C++ template instantiation (called 5882/// via InstantiateDecl). 5883/// 5884/// \param IsExplicitSpecialization whether this new function declaration is 5885/// an explicit specialization of the previous declaration. 5886/// 5887/// This sets NewFD->isInvalidDecl() to true if there was an error. 5888/// 5889/// \returns true if the function declaration is a redeclaration. 5890bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5891 LookupResult &Previous, 5892 bool IsExplicitSpecialization) { 5893 assert(!NewFD->getResultType()->isVariablyModifiedType() 5894 && "Variably modified return types are not handled here"); 5895 5896 // Check for a previous declaration of this name. 5897 if (Previous.empty() && NewFD->isExternC()) { 5898 // Since we did not find anything by this name and we're declaring 5899 // an extern "C" function, look for a non-visible extern "C" 5900 // declaration with the same name. 5901 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5902 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5903 if (Pos != LocallyScopedExternalDecls.end()) 5904 Previous.addDecl(Pos->second); 5905 } 5906 5907 bool Redeclaration = false; 5908 5909 // Merge or overload the declaration with an existing declaration of 5910 // the same name, if appropriate. 5911 if (!Previous.empty()) { 5912 // Determine whether NewFD is an overload of PrevDecl or 5913 // a declaration that requires merging. If it's an overload, 5914 // there's no more work to do here; we'll just add the new 5915 // function to the scope. 5916 5917 NamedDecl *OldDecl = 0; 5918 if (!AllowOverloadingOfFunction(Previous, Context)) { 5919 Redeclaration = true; 5920 OldDecl = Previous.getFoundDecl(); 5921 } else { 5922 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5923 /*NewIsUsingDecl*/ false)) { 5924 case Ovl_Match: 5925 Redeclaration = true; 5926 break; 5927 5928 case Ovl_NonFunction: 5929 Redeclaration = true; 5930 break; 5931 5932 case Ovl_Overload: 5933 Redeclaration = false; 5934 break; 5935 } 5936 5937 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5938 // If a function name is overloadable in C, then every function 5939 // with that name must be marked "overloadable". 5940 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5941 << Redeclaration << NewFD; 5942 NamedDecl *OverloadedDecl = 0; 5943 if (Redeclaration) 5944 OverloadedDecl = OldDecl; 5945 else if (!Previous.empty()) 5946 OverloadedDecl = Previous.getRepresentativeDecl(); 5947 if (OverloadedDecl) 5948 Diag(OverloadedDecl->getLocation(), 5949 diag::note_attribute_overloadable_prev_overload); 5950 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5951 Context)); 5952 } 5953 } 5954 5955 if (Redeclaration) { 5956 // NewFD and OldDecl represent declarations that need to be 5957 // merged. 5958 if (MergeFunctionDecl(NewFD, OldDecl, S)) { 5959 NewFD->setInvalidDecl(); 5960 return Redeclaration; 5961 } 5962 5963 Previous.clear(); 5964 Previous.addDecl(OldDecl); 5965 5966 if (FunctionTemplateDecl *OldTemplateDecl 5967 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5968 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5969 FunctionTemplateDecl *NewTemplateDecl 5970 = NewFD->getDescribedFunctionTemplate(); 5971 assert(NewTemplateDecl && "Template/non-template mismatch"); 5972 if (CXXMethodDecl *Method 5973 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5974 Method->setAccess(OldTemplateDecl->getAccess()); 5975 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5976 } 5977 5978 // If this is an explicit specialization of a member that is a function 5979 // template, mark it as a member specialization. 5980 if (IsExplicitSpecialization && 5981 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5982 NewTemplateDecl->setMemberSpecialization(); 5983 assert(OldTemplateDecl->isMemberSpecialization()); 5984 } 5985 5986 } else { 5987 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5988 NewFD->setAccess(OldDecl->getAccess()); 5989 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5990 } 5991 } 5992 } 5993 5994 // Semantic checking for this function declaration (in isolation). 5995 if (getLangOpts().CPlusPlus) { 5996 // C++-specific checks. 5997 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5998 CheckConstructor(Constructor); 5999 } else if (CXXDestructorDecl *Destructor = 6000 dyn_cast<CXXDestructorDecl>(NewFD)) { 6001 CXXRecordDecl *Record = Destructor->getParent(); 6002 QualType ClassType = Context.getTypeDeclType(Record); 6003 6004 // FIXME: Shouldn't we be able to perform this check even when the class 6005 // type is dependent? Both gcc and edg can handle that. 6006 if (!ClassType->isDependentType()) { 6007 DeclarationName Name 6008 = Context.DeclarationNames.getCXXDestructorName( 6009 Context.getCanonicalType(ClassType)); 6010 if (NewFD->getDeclName() != Name) { 6011 Diag(NewFD->getLocation(), diag::err_destructor_name); 6012 NewFD->setInvalidDecl(); 6013 return Redeclaration; 6014 } 6015 } 6016 } else if (CXXConversionDecl *Conversion 6017 = dyn_cast<CXXConversionDecl>(NewFD)) { 6018 ActOnConversionDeclarator(Conversion); 6019 } 6020 6021 // Find any virtual functions that this function overrides. 6022 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 6023 if (!Method->isFunctionTemplateSpecialization() && 6024 !Method->getDescribedFunctionTemplate()) { 6025 if (AddOverriddenMethods(Method->getParent(), Method)) { 6026 // If the function was marked as "static", we have a problem. 6027 if (NewFD->getStorageClass() == SC_Static) { 6028 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 6029 << NewFD->getDeclName(); 6030 for (CXXMethodDecl::method_iterator 6031 Overridden = Method->begin_overridden_methods(), 6032 OverriddenEnd = Method->end_overridden_methods(); 6033 Overridden != OverriddenEnd; 6034 ++Overridden) { 6035 Diag((*Overridden)->getLocation(), 6036 diag::note_overridden_virtual_function); 6037 } 6038 } 6039 } 6040 } 6041 6042 if (Method->isStatic()) 6043 checkThisInStaticMemberFunctionType(Method); 6044 } 6045 6046 // Extra checking for C++ overloaded operators (C++ [over.oper]). 6047 if (NewFD->isOverloadedOperator() && 6048 CheckOverloadedOperatorDeclaration(NewFD)) { 6049 NewFD->setInvalidDecl(); 6050 return Redeclaration; 6051 } 6052 6053 // Extra checking for C++0x literal operators (C++0x [over.literal]). 6054 if (NewFD->getLiteralIdentifier() && 6055 CheckLiteralOperatorDeclaration(NewFD)) { 6056 NewFD->setInvalidDecl(); 6057 return Redeclaration; 6058 } 6059 6060 // In C++, check default arguments now that we have merged decls. Unless 6061 // the lexical context is the class, because in this case this is done 6062 // during delayed parsing anyway. 6063 if (!CurContext->isRecord()) 6064 CheckCXXDefaultArguments(NewFD); 6065 6066 // If this function declares a builtin function, check the type of this 6067 // declaration against the expected type for the builtin. 6068 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 6069 ASTContext::GetBuiltinTypeError Error; 6070 QualType T = Context.GetBuiltinType(BuiltinID, Error); 6071 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 6072 // The type of this function differs from the type of the builtin, 6073 // so forget about the builtin entirely. 6074 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 6075 } 6076 } 6077 6078 // If this function is declared as being extern "C", then check to see if 6079 // the function returns a UDT (class, struct, or union type) that is not C 6080 // compatible, and if it does, warn the user. 6081 if (NewFD->isExternC()) { 6082 QualType R = NewFD->getResultType(); 6083 if (R->isIncompleteType() && !R->isVoidType()) 6084 Diag(NewFD->getLocation(), diag::warn_return_value_udt_incomplete) 6085 << NewFD << R; 6086 else if (!R.isPODType(Context) && !R->isVoidType()) 6087 Diag(NewFD->getLocation(), diag::warn_return_value_udt) << NewFD << R; 6088 } 6089 } 6090 return Redeclaration; 6091} 6092 6093void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 6094 // C++11 [basic.start.main]p3: A program that declares main to be inline, 6095 // static or constexpr is ill-formed. 6096 // C99 6.7.4p4: In a hosted environment, the inline function specifier 6097 // shall not appear in a declaration of main. 6098 // static main is not an error under C99, but we should warn about it. 6099 if (FD->getStorageClass() == SC_Static) 6100 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus 6101 ? diag::err_static_main : diag::warn_static_main) 6102 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 6103 if (FD->isInlineSpecified()) 6104 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 6105 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 6106 if (FD->isConstexpr()) { 6107 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 6108 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 6109 FD->setConstexpr(false); 6110 } 6111 6112 QualType T = FD->getType(); 6113 assert(T->isFunctionType() && "function decl is not of function type"); 6114 const FunctionType* FT = T->castAs<FunctionType>(); 6115 6116 // All the standards say that main() should should return 'int'. 6117 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 6118 // In C and C++, main magically returns 0 if you fall off the end; 6119 // set the flag which tells us that. 6120 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6121 FD->setHasImplicitReturnZero(true); 6122 6123 // In C with GNU extensions we allow main() to have non-integer return 6124 // type, but we should warn about the extension, and we disable the 6125 // implicit-return-zero rule. 6126 } else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) { 6127 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); 6128 6129 // Otherwise, this is just a flat-out error. 6130 } else { 6131 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 6132 FD->setInvalidDecl(true); 6133 } 6134 6135 // Treat protoless main() as nullary. 6136 if (isa<FunctionNoProtoType>(FT)) return; 6137 6138 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 6139 unsigned nparams = FTP->getNumArgs(); 6140 assert(FD->getNumParams() == nparams); 6141 6142 bool HasExtraParameters = (nparams > 3); 6143 6144 // Darwin passes an undocumented fourth argument of type char**. If 6145 // other platforms start sprouting these, the logic below will start 6146 // getting shifty. 6147 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 6148 HasExtraParameters = false; 6149 6150 if (HasExtraParameters) { 6151 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 6152 FD->setInvalidDecl(true); 6153 nparams = 3; 6154 } 6155 6156 // FIXME: a lot of the following diagnostics would be improved 6157 // if we had some location information about types. 6158 6159 QualType CharPP = 6160 Context.getPointerType(Context.getPointerType(Context.CharTy)); 6161 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 6162 6163 for (unsigned i = 0; i < nparams; ++i) { 6164 QualType AT = FTP->getArgType(i); 6165 6166 bool mismatch = true; 6167 6168 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 6169 mismatch = false; 6170 else if (Expected[i] == CharPP) { 6171 // As an extension, the following forms are okay: 6172 // char const ** 6173 // char const * const * 6174 // char * const * 6175 6176 QualifierCollector qs; 6177 const PointerType* PT; 6178 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 6179 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 6180 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 6181 qs.removeConst(); 6182 mismatch = !qs.empty(); 6183 } 6184 } 6185 6186 if (mismatch) { 6187 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 6188 // TODO: suggest replacing given type with expected type 6189 FD->setInvalidDecl(true); 6190 } 6191 } 6192 6193 if (nparams == 1 && !FD->isInvalidDecl()) { 6194 Diag(FD->getLocation(), diag::warn_main_one_arg); 6195 } 6196 6197 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 6198 Diag(FD->getLocation(), diag::err_main_template_decl); 6199 FD->setInvalidDecl(); 6200 } 6201} 6202 6203bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 6204 // FIXME: Need strict checking. In C89, we need to check for 6205 // any assignment, increment, decrement, function-calls, or 6206 // commas outside of a sizeof. In C99, it's the same list, 6207 // except that the aforementioned are allowed in unevaluated 6208 // expressions. Everything else falls under the 6209 // "may accept other forms of constant expressions" exception. 6210 // (We never end up here for C++, so the constant expression 6211 // rules there don't matter.) 6212 if (Init->isConstantInitializer(Context, false)) 6213 return false; 6214 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 6215 << Init->getSourceRange(); 6216 return true; 6217} 6218 6219namespace { 6220 // Visits an initialization expression to see if OrigDecl is evaluated in 6221 // its own initialization and throws a warning if it does. 6222 class SelfReferenceChecker 6223 : public EvaluatedExprVisitor<SelfReferenceChecker> { 6224 Sema &S; 6225 Decl *OrigDecl; 6226 bool isRecordType; 6227 bool isPODType; 6228 6229 public: 6230 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 6231 6232 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 6233 S(S), OrigDecl(OrigDecl) { 6234 isPODType = false; 6235 isRecordType = false; 6236 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 6237 isPODType = VD->getType().isPODType(S.Context); 6238 isRecordType = VD->getType()->isRecordType(); 6239 } 6240 } 6241 6242 // Sometimes, the expression passed in lacks the casts that are used 6243 // to determine which DeclRefExpr's to check. Assume that the casts 6244 // are present and continue visiting the expression. 6245 void HandleExpr(Expr *E) { 6246 // Skip checking T a = a where T is not a record type. Doing so is a 6247 // way to silence uninitialized warnings. 6248 if (isRecordType) 6249 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 6250 HandleDeclRefExpr(DRE); 6251 6252 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 6253 HandleValue(CO->getTrueExpr()); 6254 HandleValue(CO->getFalseExpr()); 6255 } 6256 6257 Visit(E); 6258 } 6259 6260 // For most expressions, the cast is directly above the DeclRefExpr. 6261 // For conditional operators, the cast can be outside the conditional 6262 // operator if both expressions are DeclRefExpr's. 6263 void HandleValue(Expr *E) { 6264 E = E->IgnoreParenImpCasts(); 6265 if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) { 6266 HandleDeclRefExpr(DRE); 6267 return; 6268 } 6269 6270 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 6271 HandleValue(CO->getTrueExpr()); 6272 HandleValue(CO->getFalseExpr()); 6273 } 6274 } 6275 6276 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 6277 if ((!isRecordType && E->getCastKind() == CK_LValueToRValue) || 6278 (isRecordType && E->getCastKind() == CK_NoOp)) 6279 HandleValue(E->getSubExpr()); 6280 6281 Inherited::VisitImplicitCastExpr(E); 6282 } 6283 6284 void VisitMemberExpr(MemberExpr *E) { 6285 // Don't warn on arrays since they can be treated as pointers. 6286 if (E->getType()->canDecayToPointerType()) return; 6287 6288 ValueDecl *VD = E->getMemberDecl(); 6289 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(VD); 6290 if (isa<FieldDecl>(VD) || (MD && !MD->isStatic())) 6291 if (DeclRefExpr *DRE 6292 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 6293 HandleDeclRefExpr(DRE); 6294 return; 6295 } 6296 6297 Inherited::VisitMemberExpr(E); 6298 } 6299 6300 void VisitUnaryOperator(UnaryOperator *E) { 6301 // For POD record types, addresses of its own members are well-defined. 6302 if (E->getOpcode() == UO_AddrOf && isRecordType && isPODType && 6303 isa<MemberExpr>(E->getSubExpr()->IgnoreParens())) return; 6304 Inherited::VisitUnaryOperator(E); 6305 } 6306 6307 void VisitObjCMessageExpr(ObjCMessageExpr *E) { return; } 6308 6309 void HandleDeclRefExpr(DeclRefExpr *DRE) { 6310 Decl* ReferenceDecl = DRE->getDecl(); 6311 if (OrigDecl != ReferenceDecl) return; 6312 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 6313 Sema::NotForRedeclaration); 6314 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 6315 S.PDiag(diag::warn_uninit_self_reference_in_init) 6316 << Result.getLookupName() 6317 << OrigDecl->getLocation() 6318 << DRE->getSourceRange()); 6319 } 6320 }; 6321} 6322 6323/// CheckSelfReference - Warns if OrigDecl is used in expression E. 6324void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 6325 SelfReferenceChecker(*this, OrigDecl).HandleExpr(E); 6326} 6327 6328/// AddInitializerToDecl - Adds the initializer Init to the 6329/// declaration dcl. If DirectInit is true, this is C++ direct 6330/// initialization rather than copy initialization. 6331void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 6332 bool DirectInit, bool TypeMayContainAuto) { 6333 // If there is no declaration, there was an error parsing it. Just ignore 6334 // the initializer. 6335 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 6336 return; 6337 6338 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6339 // With declarators parsed the way they are, the parser cannot 6340 // distinguish between a normal initializer and a pure-specifier. 6341 // Thus this grotesque test. 6342 IntegerLiteral *IL; 6343 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6344 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6345 CheckPureMethod(Method, Init->getSourceRange()); 6346 else { 6347 Diag(Method->getLocation(), diag::err_member_function_initialization) 6348 << Method->getDeclName() << Init->getSourceRange(); 6349 Method->setInvalidDecl(); 6350 } 6351 return; 6352 } 6353 6354 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6355 if (!VDecl) { 6356 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6357 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6358 RealDecl->setInvalidDecl(); 6359 return; 6360 } 6361 6362 // Check for self-references within variable initializers. 6363 // Variables declared within a function/method body are handled 6364 // by a dataflow analysis. 6365 if (!VDecl->hasLocalStorage() && !VDecl->isStaticLocal()) 6366 CheckSelfReference(RealDecl, Init); 6367 6368 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); 6369 6370 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6371 AutoType *Auto = 0; 6372 if (TypeMayContainAuto && 6373 (Auto = VDecl->getType()->getContainedAutoType()) && 6374 !Auto->isDeduced()) { 6375 Expr *DeduceInit = Init; 6376 // Initializer could be a C++ direct-initializer. Deduction only works if it 6377 // contains exactly one expression. 6378 if (CXXDirectInit) { 6379 if (CXXDirectInit->getNumExprs() == 0) { 6380 // It isn't possible to write this directly, but it is possible to 6381 // end up in this situation with "auto x(some_pack...);" 6382 Diag(CXXDirectInit->getLocStart(), 6383 diag::err_auto_var_init_no_expression) 6384 << VDecl->getDeclName() << VDecl->getType() 6385 << VDecl->getSourceRange(); 6386 RealDecl->setInvalidDecl(); 6387 return; 6388 } else if (CXXDirectInit->getNumExprs() > 1) { 6389 Diag(CXXDirectInit->getExpr(1)->getLocStart(), 6390 diag::err_auto_var_init_multiple_expressions) 6391 << VDecl->getDeclName() << VDecl->getType() 6392 << VDecl->getSourceRange(); 6393 RealDecl->setInvalidDecl(); 6394 return; 6395 } else { 6396 DeduceInit = CXXDirectInit->getExpr(0); 6397 } 6398 } 6399 TypeSourceInfo *DeducedType = 0; 6400 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) == 6401 DAR_Failed) 6402 DiagnoseAutoDeductionFailure(VDecl, DeduceInit); 6403 if (!DeducedType) { 6404 RealDecl->setInvalidDecl(); 6405 return; 6406 } 6407 VDecl->setTypeSourceInfo(DeducedType); 6408 VDecl->setType(DeducedType->getType()); 6409 VDecl->ClearLinkageCache(); 6410 6411 // In ARC, infer lifetime. 6412 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6413 VDecl->setInvalidDecl(); 6414 6415 // Warn if we deduced 'id'. 'auto' usually implies type-safety, but using 6416 // 'id' instead of a specific object type prevents most of our usual checks. 6417 // We only want to warn outside of template instantiations, though: 6418 // inside a template, the 'id' could have come from a parameter. 6419 if (ActiveTemplateInstantiations.empty() && 6420 DeducedType->getType()->isObjCIdType()) { 6421 SourceLocation Loc = DeducedType->getTypeLoc().getBeginLoc(); 6422 Diag(Loc, diag::warn_auto_var_is_id) 6423 << VDecl->getDeclName() << DeduceInit->getSourceRange(); 6424 } 6425 6426 // If this is a redeclaration, check that the type we just deduced matches 6427 // the previously declared type. 6428 if (VarDecl *Old = VDecl->getPreviousDecl()) 6429 MergeVarDeclTypes(VDecl, Old); 6430 } 6431 6432 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6433 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6434 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6435 VDecl->setInvalidDecl(); 6436 return; 6437 } 6438 6439 if (!VDecl->getType()->isDependentType()) { 6440 // A definition must end up with a complete type, which means it must be 6441 // complete with the restriction that an array type might be completed by 6442 // the initializer; note that later code assumes this restriction. 6443 QualType BaseDeclType = VDecl->getType(); 6444 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6445 BaseDeclType = Array->getElementType(); 6446 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6447 diag::err_typecheck_decl_incomplete_type)) { 6448 RealDecl->setInvalidDecl(); 6449 return; 6450 } 6451 6452 // The variable can not have an abstract class type. 6453 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6454 diag::err_abstract_type_in_decl, 6455 AbstractVariableType)) 6456 VDecl->setInvalidDecl(); 6457 } 6458 6459 const VarDecl *Def; 6460 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6461 Diag(VDecl->getLocation(), diag::err_redefinition) 6462 << VDecl->getDeclName(); 6463 Diag(Def->getLocation(), diag::note_previous_definition); 6464 VDecl->setInvalidDecl(); 6465 return; 6466 } 6467 6468 const VarDecl* PrevInit = 0; 6469 if (getLangOpts().CPlusPlus) { 6470 // C++ [class.static.data]p4 6471 // If a static data member is of const integral or const 6472 // enumeration type, its declaration in the class definition can 6473 // specify a constant-initializer which shall be an integral 6474 // constant expression (5.19). In that case, the member can appear 6475 // in integral constant expressions. The member shall still be 6476 // defined in a namespace scope if it is used in the program and the 6477 // namespace scope definition shall not contain an initializer. 6478 // 6479 // We already performed a redefinition check above, but for static 6480 // data members we also need to check whether there was an in-class 6481 // declaration with an initializer. 6482 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6483 Diag(VDecl->getLocation(), diag::err_redefinition) 6484 << VDecl->getDeclName(); 6485 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6486 return; 6487 } 6488 6489 if (VDecl->hasLocalStorage()) 6490 getCurFunction()->setHasBranchProtectedScope(); 6491 6492 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6493 VDecl->setInvalidDecl(); 6494 return; 6495 } 6496 } 6497 6498 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6499 // a kernel function cannot be initialized." 6500 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6501 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6502 VDecl->setInvalidDecl(); 6503 return; 6504 } 6505 6506 // Get the decls type and save a reference for later, since 6507 // CheckInitializerTypes may change it. 6508 QualType DclT = VDecl->getType(), SavT = DclT; 6509 6510 // Top-level message sends default to 'id' when we're in a debugger 6511 // and we are assigning it to a variable of 'id' type. 6512 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCIdType()) 6513 if (Init->getType() == Context.UnknownAnyTy && isa<ObjCMessageExpr>(Init)) { 6514 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); 6515 if (Result.isInvalid()) { 6516 VDecl->setInvalidDecl(); 6517 return; 6518 } 6519 Init = Result.take(); 6520 } 6521 6522 // Perform the initialization. 6523 if (!VDecl->isInvalidDecl()) { 6524 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6525 InitializationKind Kind 6526 = DirectInit ? 6527 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6528 Init->getLocStart(), 6529 Init->getLocEnd()) 6530 : InitializationKind::CreateDirectList( 6531 VDecl->getLocation()) 6532 : InitializationKind::CreateCopy(VDecl->getLocation(), 6533 Init->getLocStart()); 6534 6535 Expr **Args = &Init; 6536 unsigned NumArgs = 1; 6537 if (CXXDirectInit) { 6538 Args = CXXDirectInit->getExprs(); 6539 NumArgs = CXXDirectInit->getNumExprs(); 6540 } 6541 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs); 6542 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6543 MultiExprArg(*this, Args,NumArgs), 6544 &DclT); 6545 if (Result.isInvalid()) { 6546 VDecl->setInvalidDecl(); 6547 return; 6548 } 6549 6550 Init = Result.takeAs<Expr>(); 6551 } 6552 6553 // If the type changed, it means we had an incomplete type that was 6554 // completed by the initializer. For example: 6555 // int ary[] = { 1, 3, 5 }; 6556 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6557 if (!VDecl->isInvalidDecl() && (DclT != SavT)) 6558 VDecl->setType(DclT); 6559 6560 // Check any implicit conversions within the expression. 6561 CheckImplicitConversions(Init, VDecl->getLocation()); 6562 6563 if (!VDecl->isInvalidDecl()) 6564 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6565 6566 Init = MaybeCreateExprWithCleanups(Init); 6567 // Attach the initializer to the decl. 6568 VDecl->setInit(Init); 6569 6570 if (VDecl->isLocalVarDecl()) { 6571 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6572 // static storage duration shall be constant expressions or string literals. 6573 // C++ does not have this restriction. 6574 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() && 6575 VDecl->getStorageClass() == SC_Static) 6576 CheckForConstantInitializer(Init, DclT); 6577 } else if (VDecl->isStaticDataMember() && 6578 VDecl->getLexicalDeclContext()->isRecord()) { 6579 // This is an in-class initialization for a static data member, e.g., 6580 // 6581 // struct S { 6582 // static const int value = 17; 6583 // }; 6584 6585 // C++ [class.mem]p4: 6586 // A member-declarator can contain a constant-initializer only 6587 // if it declares a static member (9.4) of const integral or 6588 // const enumeration type, see 9.4.2. 6589 // 6590 // C++11 [class.static.data]p3: 6591 // If a non-volatile const static data member is of integral or 6592 // enumeration type, its declaration in the class definition can 6593 // specify a brace-or-equal-initializer in which every initalizer-clause 6594 // that is an assignment-expression is a constant expression. A static 6595 // data member of literal type can be declared in the class definition 6596 // with the constexpr specifier; if so, its declaration shall specify a 6597 // brace-or-equal-initializer in which every initializer-clause that is 6598 // an assignment-expression is a constant expression. 6599 6600 // Do nothing on dependent types. 6601 if (DclT->isDependentType()) { 6602 6603 // Allow any 'static constexpr' members, whether or not they are of literal 6604 // type. We separately check that every constexpr variable is of literal 6605 // type. 6606 } else if (VDecl->isConstexpr()) { 6607 6608 // Require constness. 6609 } else if (!DclT.isConstQualified()) { 6610 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6611 << Init->getSourceRange(); 6612 VDecl->setInvalidDecl(); 6613 6614 // We allow integer constant expressions in all cases. 6615 } else if (DclT->isIntegralOrEnumerationType()) { 6616 // Check whether the expression is a constant expression. 6617 SourceLocation Loc; 6618 if (getLangOpts().CPlusPlus0x && DclT.isVolatileQualified()) 6619 // In C++11, a non-constexpr const static data member with an 6620 // in-class initializer cannot be volatile. 6621 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6622 else if (Init->isValueDependent()) 6623 ; // Nothing to check. 6624 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6625 ; // Ok, it's an ICE! 6626 else if (Init->isEvaluatable(Context)) { 6627 // If we can constant fold the initializer through heroics, accept it, 6628 // but report this as a use of an extension for -pedantic. 6629 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6630 << Init->getSourceRange(); 6631 } else { 6632 // Otherwise, this is some crazy unknown case. Report the issue at the 6633 // location provided by the isIntegerConstantExpr failed check. 6634 Diag(Loc, diag::err_in_class_initializer_non_constant) 6635 << Init->getSourceRange(); 6636 VDecl->setInvalidDecl(); 6637 } 6638 6639 // We allow foldable floating-point constants as an extension. 6640 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6641 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6642 << DclT << Init->getSourceRange(); 6643 if (getLangOpts().CPlusPlus0x) 6644 Diag(VDecl->getLocation(), 6645 diag::note_in_class_initializer_float_type_constexpr) 6646 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6647 6648 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6649 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6650 << Init->getSourceRange(); 6651 VDecl->setInvalidDecl(); 6652 } 6653 6654 // Suggest adding 'constexpr' in C++11 for literal types. 6655 } else if (getLangOpts().CPlusPlus0x && DclT->isLiteralType()) { 6656 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6657 << DclT << Init->getSourceRange() 6658 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6659 VDecl->setConstexpr(true); 6660 6661 } else { 6662 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6663 << DclT << Init->getSourceRange(); 6664 VDecl->setInvalidDecl(); 6665 } 6666 } else if (VDecl->isFileVarDecl()) { 6667 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6668 (!getLangOpts().CPlusPlus || 6669 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6670 Diag(VDecl->getLocation(), diag::warn_extern_init); 6671 6672 // C99 6.7.8p4. All file scoped initializers need to be constant. 6673 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) 6674 CheckForConstantInitializer(Init, DclT); 6675 } 6676 6677 // We will represent direct-initialization similarly to copy-initialization: 6678 // int x(1); -as-> int x = 1; 6679 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6680 // 6681 // Clients that want to distinguish between the two forms, can check for 6682 // direct initializer using VarDecl::getInitStyle(). 6683 // A major benefit is that clients that don't particularly care about which 6684 // exactly form was it (like the CodeGen) can handle both cases without 6685 // special case code. 6686 6687 // C++ 8.5p11: 6688 // The form of initialization (using parentheses or '=') is generally 6689 // insignificant, but does matter when the entity being initialized has a 6690 // class type. 6691 if (CXXDirectInit) { 6692 assert(DirectInit && "Call-style initializer must be direct init."); 6693 VDecl->setInitStyle(VarDecl::CallInit); 6694 } else if (DirectInit) { 6695 // This must be list-initialization. No other way is direct-initialization. 6696 VDecl->setInitStyle(VarDecl::ListInit); 6697 } 6698 6699 CheckCompleteVariableDeclaration(VDecl); 6700} 6701 6702/// ActOnInitializerError - Given that there was an error parsing an 6703/// initializer for the given declaration, try to return to some form 6704/// of sanity. 6705void Sema::ActOnInitializerError(Decl *D) { 6706 // Our main concern here is re-establishing invariants like "a 6707 // variable's type is either dependent or complete". 6708 if (!D || D->isInvalidDecl()) return; 6709 6710 VarDecl *VD = dyn_cast<VarDecl>(D); 6711 if (!VD) return; 6712 6713 // Auto types are meaningless if we can't make sense of the initializer. 6714 if (ParsingInitForAutoVars.count(D)) { 6715 D->setInvalidDecl(); 6716 return; 6717 } 6718 6719 QualType Ty = VD->getType(); 6720 if (Ty->isDependentType()) return; 6721 6722 // Require a complete type. 6723 if (RequireCompleteType(VD->getLocation(), 6724 Context.getBaseElementType(Ty), 6725 diag::err_typecheck_decl_incomplete_type)) { 6726 VD->setInvalidDecl(); 6727 return; 6728 } 6729 6730 // Require an abstract type. 6731 if (RequireNonAbstractType(VD->getLocation(), Ty, 6732 diag::err_abstract_type_in_decl, 6733 AbstractVariableType)) { 6734 VD->setInvalidDecl(); 6735 return; 6736 } 6737 6738 // Don't bother complaining about constructors or destructors, 6739 // though. 6740} 6741 6742void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6743 bool TypeMayContainAuto) { 6744 // If there is no declaration, there was an error parsing it. Just ignore it. 6745 if (RealDecl == 0) 6746 return; 6747 6748 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6749 QualType Type = Var->getType(); 6750 6751 // C++11 [dcl.spec.auto]p3 6752 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6753 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6754 << Var->getDeclName() << Type; 6755 Var->setInvalidDecl(); 6756 return; 6757 } 6758 6759 // C++11 [class.static.data]p3: A static data member can be declared with 6760 // the constexpr specifier; if so, its declaration shall specify 6761 // a brace-or-equal-initializer. 6762 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6763 // the definition of a variable [...] or the declaration of a static data 6764 // member. 6765 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6766 if (Var->isStaticDataMember()) 6767 Diag(Var->getLocation(), 6768 diag::err_constexpr_static_mem_var_requires_init) 6769 << Var->getDeclName(); 6770 else 6771 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6772 Var->setInvalidDecl(); 6773 return; 6774 } 6775 6776 switch (Var->isThisDeclarationADefinition()) { 6777 case VarDecl::Definition: 6778 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6779 break; 6780 6781 // We have an out-of-line definition of a static data member 6782 // that has an in-class initializer, so we type-check this like 6783 // a declaration. 6784 // 6785 // Fall through 6786 6787 case VarDecl::DeclarationOnly: 6788 // It's only a declaration. 6789 6790 // Block scope. C99 6.7p7: If an identifier for an object is 6791 // declared with no linkage (C99 6.2.2p6), the type for the 6792 // object shall be complete. 6793 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6794 !Var->getLinkage() && !Var->isInvalidDecl() && 6795 RequireCompleteType(Var->getLocation(), Type, 6796 diag::err_typecheck_decl_incomplete_type)) 6797 Var->setInvalidDecl(); 6798 6799 // Make sure that the type is not abstract. 6800 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6801 RequireNonAbstractType(Var->getLocation(), Type, 6802 diag::err_abstract_type_in_decl, 6803 AbstractVariableType)) 6804 Var->setInvalidDecl(); 6805 return; 6806 6807 case VarDecl::TentativeDefinition: 6808 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6809 // object that has file scope without an initializer, and without a 6810 // storage-class specifier or with the storage-class specifier "static", 6811 // constitutes a tentative definition. Note: A tentative definition with 6812 // external linkage is valid (C99 6.2.2p5). 6813 if (!Var->isInvalidDecl()) { 6814 if (const IncompleteArrayType *ArrayT 6815 = Context.getAsIncompleteArrayType(Type)) { 6816 if (RequireCompleteType(Var->getLocation(), 6817 ArrayT->getElementType(), 6818 diag::err_illegal_decl_array_incomplete_type)) 6819 Var->setInvalidDecl(); 6820 } else if (Var->getStorageClass() == SC_Static) { 6821 // C99 6.9.2p3: If the declaration of an identifier for an object is 6822 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6823 // declared type shall not be an incomplete type. 6824 // NOTE: code such as the following 6825 // static struct s; 6826 // struct s { int a; }; 6827 // is accepted by gcc. Hence here we issue a warning instead of 6828 // an error and we do not invalidate the static declaration. 6829 // NOTE: to avoid multiple warnings, only check the first declaration. 6830 if (Var->getPreviousDecl() == 0) 6831 RequireCompleteType(Var->getLocation(), Type, 6832 diag::ext_typecheck_decl_incomplete_type); 6833 } 6834 } 6835 6836 // Record the tentative definition; we're done. 6837 if (!Var->isInvalidDecl()) 6838 TentativeDefinitions.push_back(Var); 6839 return; 6840 } 6841 6842 // Provide a specific diagnostic for uninitialized variable 6843 // definitions with incomplete array type. 6844 if (Type->isIncompleteArrayType()) { 6845 Diag(Var->getLocation(), 6846 diag::err_typecheck_incomplete_array_needs_initializer); 6847 Var->setInvalidDecl(); 6848 return; 6849 } 6850 6851 // Provide a specific diagnostic for uninitialized variable 6852 // definitions with reference type. 6853 if (Type->isReferenceType()) { 6854 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6855 << Var->getDeclName() 6856 << SourceRange(Var->getLocation(), Var->getLocation()); 6857 Var->setInvalidDecl(); 6858 return; 6859 } 6860 6861 // Do not attempt to type-check the default initializer for a 6862 // variable with dependent type. 6863 if (Type->isDependentType()) 6864 return; 6865 6866 if (Var->isInvalidDecl()) 6867 return; 6868 6869 if (RequireCompleteType(Var->getLocation(), 6870 Context.getBaseElementType(Type), 6871 diag::err_typecheck_decl_incomplete_type)) { 6872 Var->setInvalidDecl(); 6873 return; 6874 } 6875 6876 // The variable can not have an abstract class type. 6877 if (RequireNonAbstractType(Var->getLocation(), Type, 6878 diag::err_abstract_type_in_decl, 6879 AbstractVariableType)) { 6880 Var->setInvalidDecl(); 6881 return; 6882 } 6883 6884 // Check for jumps past the implicit initializer. C++0x 6885 // clarifies that this applies to a "variable with automatic 6886 // storage duration", not a "local variable". 6887 // C++11 [stmt.dcl]p3 6888 // A program that jumps from a point where a variable with automatic 6889 // storage duration is not in scope to a point where it is in scope is 6890 // ill-formed unless the variable has scalar type, class type with a 6891 // trivial default constructor and a trivial destructor, a cv-qualified 6892 // version of one of these types, or an array of one of the preceding 6893 // types and is declared without an initializer. 6894 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) { 6895 if (const RecordType *Record 6896 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6897 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6898 // Mark the function for further checking even if the looser rules of 6899 // C++11 do not require such checks, so that we can diagnose 6900 // incompatibilities with C++98. 6901 if (!CXXRecord->isPOD()) 6902 getCurFunction()->setHasBranchProtectedScope(); 6903 } 6904 } 6905 6906 // C++03 [dcl.init]p9: 6907 // If no initializer is specified for an object, and the 6908 // object is of (possibly cv-qualified) non-POD class type (or 6909 // array thereof), the object shall be default-initialized; if 6910 // the object is of const-qualified type, the underlying class 6911 // type shall have a user-declared default 6912 // constructor. Otherwise, if no initializer is specified for 6913 // a non- static object, the object and its subobjects, if 6914 // any, have an indeterminate initial value); if the object 6915 // or any of its subobjects are of const-qualified type, the 6916 // program is ill-formed. 6917 // C++0x [dcl.init]p11: 6918 // If no initializer is specified for an object, the object is 6919 // default-initialized; [...]. 6920 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6921 InitializationKind Kind 6922 = InitializationKind::CreateDefault(Var->getLocation()); 6923 6924 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6925 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6926 MultiExprArg(*this, 0, 0)); 6927 if (Init.isInvalid()) 6928 Var->setInvalidDecl(); 6929 else if (Init.get()) { 6930 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6931 // This is important for template substitution. 6932 Var->setInitStyle(VarDecl::CallInit); 6933 } 6934 6935 CheckCompleteVariableDeclaration(Var); 6936 } 6937} 6938 6939void Sema::ActOnCXXForRangeDecl(Decl *D) { 6940 VarDecl *VD = dyn_cast<VarDecl>(D); 6941 if (!VD) { 6942 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6943 D->setInvalidDecl(); 6944 return; 6945 } 6946 6947 VD->setCXXForRangeDecl(true); 6948 6949 // for-range-declaration cannot be given a storage class specifier. 6950 int Error = -1; 6951 switch (VD->getStorageClassAsWritten()) { 6952 case SC_None: 6953 break; 6954 case SC_Extern: 6955 Error = 0; 6956 break; 6957 case SC_Static: 6958 Error = 1; 6959 break; 6960 case SC_PrivateExtern: 6961 Error = 2; 6962 break; 6963 case SC_Auto: 6964 Error = 3; 6965 break; 6966 case SC_Register: 6967 Error = 4; 6968 break; 6969 case SC_OpenCLWorkGroupLocal: 6970 llvm_unreachable("Unexpected storage class"); 6971 } 6972 if (VD->isConstexpr()) 6973 Error = 5; 6974 if (Error != -1) { 6975 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6976 << VD->getDeclName() << Error; 6977 D->setInvalidDecl(); 6978 } 6979} 6980 6981void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6982 if (var->isInvalidDecl()) return; 6983 6984 // In ARC, don't allow jumps past the implicit initialization of a 6985 // local retaining variable. 6986 if (getLangOpts().ObjCAutoRefCount && 6987 var->hasLocalStorage()) { 6988 switch (var->getType().getObjCLifetime()) { 6989 case Qualifiers::OCL_None: 6990 case Qualifiers::OCL_ExplicitNone: 6991 case Qualifiers::OCL_Autoreleasing: 6992 break; 6993 6994 case Qualifiers::OCL_Weak: 6995 case Qualifiers::OCL_Strong: 6996 getCurFunction()->setHasBranchProtectedScope(); 6997 break; 6998 } 6999 } 7000 7001 // All the following checks are C++ only. 7002 if (!getLangOpts().CPlusPlus) return; 7003 7004 QualType baseType = Context.getBaseElementType(var->getType()); 7005 if (baseType->isDependentType()) return; 7006 7007 // __block variables might require us to capture a copy-initializer. 7008 if (var->hasAttr<BlocksAttr>()) { 7009 // It's currently invalid to ever have a __block variable with an 7010 // array type; should we diagnose that here? 7011 7012 // Regardless, we don't want to ignore array nesting when 7013 // constructing this copy. 7014 QualType type = var->getType(); 7015 7016 if (type->isStructureOrClassType()) { 7017 SourceLocation poi = var->getLocation(); 7018 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi); 7019 ExprResult result = 7020 PerformCopyInitialization( 7021 InitializedEntity::InitializeBlock(poi, type, false), 7022 poi, Owned(varRef)); 7023 if (!result.isInvalid()) { 7024 result = MaybeCreateExprWithCleanups(result); 7025 Expr *init = result.takeAs<Expr>(); 7026 Context.setBlockVarCopyInits(var, init); 7027 } 7028 } 7029 } 7030 7031 Expr *Init = var->getInit(); 7032 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 7033 7034 if (!var->getDeclContext()->isDependentContext() && Init) { 7035 if (IsGlobal && !var->isConstexpr() && 7036 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 7037 var->getLocation()) 7038 != DiagnosticsEngine::Ignored && 7039 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 7040 Diag(var->getLocation(), diag::warn_global_constructor) 7041 << Init->getSourceRange(); 7042 7043 if (var->isConstexpr()) { 7044 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 7045 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 7046 SourceLocation DiagLoc = var->getLocation(); 7047 // If the note doesn't add any useful information other than a source 7048 // location, fold it into the primary diagnostic. 7049 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 7050 diag::note_invalid_subexpr_in_const_expr) { 7051 DiagLoc = Notes[0].first; 7052 Notes.clear(); 7053 } 7054 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 7055 << var << Init->getSourceRange(); 7056 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 7057 Diag(Notes[I].first, Notes[I].second); 7058 } 7059 } else if (var->isUsableInConstantExpressions(Context)) { 7060 // Check whether the initializer of a const variable of integral or 7061 // enumeration type is an ICE now, since we can't tell whether it was 7062 // initialized by a constant expression if we check later. 7063 var->checkInitIsICE(); 7064 } 7065 } 7066 7067 // Require the destructor. 7068 if (const RecordType *recordType = baseType->getAs<RecordType>()) 7069 FinalizeVarWithDestructor(var, recordType); 7070} 7071 7072/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 7073/// any semantic actions necessary after any initializer has been attached. 7074void 7075Sema::FinalizeDeclaration(Decl *ThisDecl) { 7076 // Note that we are no longer parsing the initializer for this declaration. 7077 ParsingInitForAutoVars.erase(ThisDecl); 7078} 7079 7080Sema::DeclGroupPtrTy 7081Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 7082 Decl **Group, unsigned NumDecls) { 7083 SmallVector<Decl*, 8> Decls; 7084 7085 if (DS.isTypeSpecOwned()) 7086 Decls.push_back(DS.getRepAsDecl()); 7087 7088 for (unsigned i = 0; i != NumDecls; ++i) 7089 if (Decl *D = Group[i]) 7090 Decls.push_back(D); 7091 7092 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 7093 DS.getTypeSpecType() == DeclSpec::TST_auto); 7094} 7095 7096/// BuildDeclaratorGroup - convert a list of declarations into a declaration 7097/// group, performing any necessary semantic checking. 7098Sema::DeclGroupPtrTy 7099Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 7100 bool TypeMayContainAuto) { 7101 // C++0x [dcl.spec.auto]p7: 7102 // If the type deduced for the template parameter U is not the same in each 7103 // deduction, the program is ill-formed. 7104 // FIXME: When initializer-list support is added, a distinction is needed 7105 // between the deduced type U and the deduced type which 'auto' stands for. 7106 // auto a = 0, b = { 1, 2, 3 }; 7107 // is legal because the deduced type U is 'int' in both cases. 7108 if (TypeMayContainAuto && NumDecls > 1) { 7109 QualType Deduced; 7110 CanQualType DeducedCanon; 7111 VarDecl *DeducedDecl = 0; 7112 for (unsigned i = 0; i != NumDecls; ++i) { 7113 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 7114 AutoType *AT = D->getType()->getContainedAutoType(); 7115 // Don't reissue diagnostics when instantiating a template. 7116 if (AT && D->isInvalidDecl()) 7117 break; 7118 if (AT && AT->isDeduced()) { 7119 QualType U = AT->getDeducedType(); 7120 CanQualType UCanon = Context.getCanonicalType(U); 7121 if (Deduced.isNull()) { 7122 Deduced = U; 7123 DeducedCanon = UCanon; 7124 DeducedDecl = D; 7125 } else if (DeducedCanon != UCanon) { 7126 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 7127 diag::err_auto_different_deductions) 7128 << Deduced << DeducedDecl->getDeclName() 7129 << U << D->getDeclName() 7130 << DeducedDecl->getInit()->getSourceRange() 7131 << D->getInit()->getSourceRange(); 7132 D->setInvalidDecl(); 7133 break; 7134 } 7135 } 7136 } 7137 } 7138 } 7139 7140 ActOnDocumentableDecls(Group, NumDecls); 7141 7142 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 7143} 7144 7145void Sema::ActOnDocumentableDecl(Decl *D) { 7146 ActOnDocumentableDecls(&D, 1); 7147} 7148 7149void Sema::ActOnDocumentableDecls(Decl **Group, unsigned NumDecls) { 7150 // Don't parse the comment if Doxygen diagnostics are ignored. 7151 if (NumDecls == 0 || !Group[0]) 7152 return; 7153 7154 if (Diags.getDiagnosticLevel(diag::warn_doc_param_not_found, 7155 Group[0]->getLocation()) 7156 == DiagnosticsEngine::Ignored) 7157 return; 7158 7159 if (NumDecls >= 2) { 7160 // This is a decl group. Normally it will contain only declarations 7161 // procuded from declarator list. But in case we have any definitions or 7162 // additional declaration references: 7163 // 'typedef struct S {} S;' 7164 // 'typedef struct S *S;' 7165 // 'struct S *pS;' 7166 // FinalizeDeclaratorGroup adds these as separate declarations. 7167 Decl *MaybeTagDecl = Group[0]; 7168 if (MaybeTagDecl && isa<TagDecl>(MaybeTagDecl)) { 7169 Group++; 7170 NumDecls--; 7171 } 7172 } 7173 7174 // See if there are any new comments that are not attached to a decl. 7175 ArrayRef<RawComment *> Comments = Context.getRawCommentList().getComments(); 7176 if (!Comments.empty() && 7177 !Comments.back()->isAttached()) { 7178 // There is at least one comment that not attached to a decl. 7179 // Maybe it should be attached to one of these decls? 7180 // 7181 // Note that this way we pick up not only comments that precede the 7182 // declaration, but also comments that *follow* the declaration -- thanks to 7183 // the lookahead in the lexer: we've consumed the semicolon and looked 7184 // ahead through comments. 7185 for (unsigned i = 0; i != NumDecls; ++i) 7186 Context.getCommentForDecl(Group[i]); 7187 } 7188} 7189 7190/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 7191/// to introduce parameters into function prototype scope. 7192Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 7193 const DeclSpec &DS = D.getDeclSpec(); 7194 7195 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 7196 // C++03 [dcl.stc]p2 also permits 'auto'. 7197 VarDecl::StorageClass StorageClass = SC_None; 7198 VarDecl::StorageClass StorageClassAsWritten = SC_None; 7199 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 7200 StorageClass = SC_Register; 7201 StorageClassAsWritten = SC_Register; 7202 } else if (getLangOpts().CPlusPlus && 7203 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 7204 StorageClass = SC_Auto; 7205 StorageClassAsWritten = SC_Auto; 7206 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 7207 Diag(DS.getStorageClassSpecLoc(), 7208 diag::err_invalid_storage_class_in_func_decl); 7209 D.getMutableDeclSpec().ClearStorageClassSpecs(); 7210 } 7211 7212 if (D.getDeclSpec().isThreadSpecified()) 7213 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7214 if (D.getDeclSpec().isConstexprSpecified()) 7215 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 7216 << 0; 7217 7218 DiagnoseFunctionSpecifiers(D); 7219 7220 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7221 QualType parmDeclType = TInfo->getType(); 7222 7223 if (getLangOpts().CPlusPlus) { 7224 // Check that there are no default arguments inside the type of this 7225 // parameter. 7226 CheckExtraCXXDefaultArguments(D); 7227 7228 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 7229 if (D.getCXXScopeSpec().isSet()) { 7230 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 7231 << D.getCXXScopeSpec().getRange(); 7232 D.getCXXScopeSpec().clear(); 7233 } 7234 } 7235 7236 // Ensure we have a valid name 7237 IdentifierInfo *II = 0; 7238 if (D.hasName()) { 7239 II = D.getIdentifier(); 7240 if (!II) { 7241 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 7242 << GetNameForDeclarator(D).getName().getAsString(); 7243 D.setInvalidType(true); 7244 } 7245 } 7246 7247 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 7248 if (II) { 7249 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 7250 ForRedeclaration); 7251 LookupName(R, S); 7252 if (R.isSingleResult()) { 7253 NamedDecl *PrevDecl = R.getFoundDecl(); 7254 if (PrevDecl->isTemplateParameter()) { 7255 // Maybe we will complain about the shadowed template parameter. 7256 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7257 // Just pretend that we didn't see the previous declaration. 7258 PrevDecl = 0; 7259 } else if (S->isDeclScope(PrevDecl)) { 7260 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 7261 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7262 7263 // Recover by removing the name 7264 II = 0; 7265 D.SetIdentifier(0, D.getIdentifierLoc()); 7266 D.setInvalidType(true); 7267 } 7268 } 7269 } 7270 7271 // Temporarily put parameter variables in the translation unit, not 7272 // the enclosing context. This prevents them from accidentally 7273 // looking like class members in C++. 7274 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 7275 D.getLocStart(), 7276 D.getIdentifierLoc(), II, 7277 parmDeclType, TInfo, 7278 StorageClass, StorageClassAsWritten); 7279 7280 if (D.isInvalidType()) 7281 New->setInvalidDecl(); 7282 7283 assert(S->isFunctionPrototypeScope()); 7284 assert(S->getFunctionPrototypeDepth() >= 1); 7285 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 7286 S->getNextFunctionPrototypeIndex()); 7287 7288 // Add the parameter declaration into this scope. 7289 S->AddDecl(New); 7290 if (II) 7291 IdResolver.AddDecl(New); 7292 7293 ProcessDeclAttributes(S, New, D); 7294 7295 if (D.getDeclSpec().isModulePrivateSpecified()) 7296 Diag(New->getLocation(), diag::err_module_private_local) 7297 << 1 << New->getDeclName() 7298 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7299 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7300 7301 if (New->hasAttr<BlocksAttr>()) { 7302 Diag(New->getLocation(), diag::err_block_on_nonlocal); 7303 } 7304 return New; 7305} 7306 7307/// \brief Synthesizes a variable for a parameter arising from a 7308/// typedef. 7309ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 7310 SourceLocation Loc, 7311 QualType T) { 7312 /* FIXME: setting StartLoc == Loc. 7313 Would it be worth to modify callers so as to provide proper source 7314 location for the unnamed parameters, embedding the parameter's type? */ 7315 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 7316 T, Context.getTrivialTypeSourceInfo(T, Loc), 7317 SC_None, SC_None, 0); 7318 Param->setImplicit(); 7319 return Param; 7320} 7321 7322void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 7323 ParmVarDecl * const *ParamEnd) { 7324 // Don't diagnose unused-parameter errors in template instantiations; we 7325 // will already have done so in the template itself. 7326 if (!ActiveTemplateInstantiations.empty()) 7327 return; 7328 7329 for (; Param != ParamEnd; ++Param) { 7330 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 7331 !(*Param)->hasAttr<UnusedAttr>()) { 7332 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 7333 << (*Param)->getDeclName(); 7334 } 7335 } 7336} 7337 7338void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 7339 ParmVarDecl * const *ParamEnd, 7340 QualType ReturnTy, 7341 NamedDecl *D) { 7342 if (LangOpts.NumLargeByValueCopy == 0) // No check. 7343 return; 7344 7345 // Warn if the return value is pass-by-value and larger than the specified 7346 // threshold. 7347 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 7348 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 7349 if (Size > LangOpts.NumLargeByValueCopy) 7350 Diag(D->getLocation(), diag::warn_return_value_size) 7351 << D->getDeclName() << Size; 7352 } 7353 7354 // Warn if any parameter is pass-by-value and larger than the specified 7355 // threshold. 7356 for (; Param != ParamEnd; ++Param) { 7357 QualType T = (*Param)->getType(); 7358 if (T->isDependentType() || !T.isPODType(Context)) 7359 continue; 7360 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 7361 if (Size > LangOpts.NumLargeByValueCopy) 7362 Diag((*Param)->getLocation(), diag::warn_parameter_size) 7363 << (*Param)->getDeclName() << Size; 7364 } 7365} 7366 7367ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 7368 SourceLocation NameLoc, IdentifierInfo *Name, 7369 QualType T, TypeSourceInfo *TSInfo, 7370 VarDecl::StorageClass StorageClass, 7371 VarDecl::StorageClass StorageClassAsWritten) { 7372 // In ARC, infer a lifetime qualifier for appropriate parameter types. 7373 if (getLangOpts().ObjCAutoRefCount && 7374 T.getObjCLifetime() == Qualifiers::OCL_None && 7375 T->isObjCLifetimeType()) { 7376 7377 Qualifiers::ObjCLifetime lifetime; 7378 7379 // Special cases for arrays: 7380 // - if it's const, use __unsafe_unretained 7381 // - otherwise, it's an error 7382 if (T->isArrayType()) { 7383 if (!T.isConstQualified()) { 7384 DelayedDiagnostics.add( 7385 sema::DelayedDiagnostic::makeForbiddenType( 7386 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 7387 } 7388 lifetime = Qualifiers::OCL_ExplicitNone; 7389 } else { 7390 lifetime = T->getObjCARCImplicitLifetime(); 7391 } 7392 T = Context.getLifetimeQualifiedType(T, lifetime); 7393 } 7394 7395 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 7396 Context.getAdjustedParameterType(T), 7397 TSInfo, 7398 StorageClass, StorageClassAsWritten, 7399 0); 7400 7401 // Parameters can not be abstract class types. 7402 // For record types, this is done by the AbstractClassUsageDiagnoser once 7403 // the class has been completely parsed. 7404 if (!CurContext->isRecord() && 7405 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 7406 AbstractParamType)) 7407 New->setInvalidDecl(); 7408 7409 // Parameter declarators cannot be interface types. All ObjC objects are 7410 // passed by reference. 7411 if (T->isObjCObjectType()) { 7412 SourceLocation TypeEndLoc = TSInfo->getTypeLoc().getLocEnd(); 7413 Diag(NameLoc, 7414 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 7415 << FixItHint::CreateInsertion(TypeEndLoc, "*"); 7416 T = Context.getObjCObjectPointerType(T); 7417 New->setType(T); 7418 } 7419 7420 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 7421 // duration shall not be qualified by an address-space qualifier." 7422 // Since all parameters have automatic store duration, they can not have 7423 // an address space. 7424 if (T.getAddressSpace() != 0) { 7425 Diag(NameLoc, diag::err_arg_with_address_space); 7426 New->setInvalidDecl(); 7427 } 7428 7429 return New; 7430} 7431 7432void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 7433 SourceLocation LocAfterDecls) { 7434 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 7435 7436 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 7437 // for a K&R function. 7438 if (!FTI.hasPrototype) { 7439 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 7440 --i; 7441 if (FTI.ArgInfo[i].Param == 0) { 7442 SmallString<256> Code; 7443 llvm::raw_svector_ostream(Code) << " int " 7444 << FTI.ArgInfo[i].Ident->getName() 7445 << ";\n"; 7446 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 7447 << FTI.ArgInfo[i].Ident 7448 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 7449 7450 // Implicitly declare the argument as type 'int' for lack of a better 7451 // type. 7452 AttributeFactory attrs; 7453 DeclSpec DS(attrs); 7454 const char* PrevSpec; // unused 7455 unsigned DiagID; // unused 7456 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 7457 PrevSpec, DiagID); 7458 Declarator ParamD(DS, Declarator::KNRTypeListContext); 7459 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 7460 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 7461 } 7462 } 7463 } 7464} 7465 7466Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 7467 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 7468 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 7469 Scope *ParentScope = FnBodyScope->getParent(); 7470 7471 D.setFunctionDefinitionKind(FDK_Definition); 7472 Decl *DP = HandleDeclarator(ParentScope, D, 7473 MultiTemplateParamsArg(*this)); 7474 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7475} 7476 7477static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7478 // Don't warn about invalid declarations. 7479 if (FD->isInvalidDecl()) 7480 return false; 7481 7482 // Or declarations that aren't global. 7483 if (!FD->isGlobal()) 7484 return false; 7485 7486 // Don't warn about C++ member functions. 7487 if (isa<CXXMethodDecl>(FD)) 7488 return false; 7489 7490 // Don't warn about 'main'. 7491 if (FD->isMain()) 7492 return false; 7493 7494 // Don't warn about inline functions. 7495 if (FD->isInlined()) 7496 return false; 7497 7498 // Don't warn about function templates. 7499 if (FD->getDescribedFunctionTemplate()) 7500 return false; 7501 7502 // Don't warn about function template specializations. 7503 if (FD->isFunctionTemplateSpecialization()) 7504 return false; 7505 7506 // Don't warn for OpenCL kernels. 7507 if (FD->hasAttr<OpenCLKernelAttr>()) 7508 return false; 7509 7510 bool MissingPrototype = true; 7511 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7512 Prev; Prev = Prev->getPreviousDecl()) { 7513 // Ignore any declarations that occur in function or method 7514 // scope, because they aren't visible from the header. 7515 if (Prev->getDeclContext()->isFunctionOrMethod()) 7516 continue; 7517 7518 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7519 break; 7520 } 7521 7522 return MissingPrototype; 7523} 7524 7525void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7526 // Don't complain if we're in GNU89 mode and the previous definition 7527 // was an extern inline function. 7528 const FunctionDecl *Definition; 7529 if (FD->isDefined(Definition) && 7530 !canRedefineFunction(Definition, getLangOpts())) { 7531 if (getLangOpts().GNUMode && Definition->isInlineSpecified() && 7532 Definition->getStorageClass() == SC_Extern) 7533 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7534 << FD->getDeclName() << getLangOpts().CPlusPlus; 7535 else 7536 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7537 Diag(Definition->getLocation(), diag::note_previous_definition); 7538 } 7539} 7540 7541Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7542 // Clear the last template instantiation error context. 7543 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7544 7545 if (!D) 7546 return D; 7547 FunctionDecl *FD = 0; 7548 7549 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7550 FD = FunTmpl->getTemplatedDecl(); 7551 else 7552 FD = cast<FunctionDecl>(D); 7553 7554 // Enter a new function scope 7555 PushFunctionScope(); 7556 7557 // See if this is a redefinition. 7558 if (!FD->isLateTemplateParsed()) 7559 CheckForFunctionRedefinition(FD); 7560 7561 // Builtin functions cannot be defined. 7562 if (unsigned BuiltinID = FD->getBuiltinID()) { 7563 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7564 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7565 FD->setInvalidDecl(); 7566 } 7567 } 7568 7569 // The return type of a function definition must be complete 7570 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7571 QualType ResultType = FD->getResultType(); 7572 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7573 !FD->isInvalidDecl() && 7574 RequireCompleteType(FD->getLocation(), ResultType, 7575 diag::err_func_def_incomplete_result)) 7576 FD->setInvalidDecl(); 7577 7578 // GNU warning -Wmissing-prototypes: 7579 // Warn if a global function is defined without a previous 7580 // prototype declaration. This warning is issued even if the 7581 // definition itself provides a prototype. The aim is to detect 7582 // global functions that fail to be declared in header files. 7583 if (ShouldWarnAboutMissingPrototype(FD)) 7584 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7585 7586 if (FnBodyScope) 7587 PushDeclContext(FnBodyScope, FD); 7588 7589 // Check the validity of our function parameters 7590 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7591 /*CheckParameterNames=*/true); 7592 7593 // Introduce our parameters into the function scope 7594 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7595 ParmVarDecl *Param = FD->getParamDecl(p); 7596 Param->setOwningFunction(FD); 7597 7598 // If this has an identifier, add it to the scope stack. 7599 if (Param->getIdentifier() && FnBodyScope) { 7600 CheckShadow(FnBodyScope, Param); 7601 7602 PushOnScopeChains(Param, FnBodyScope); 7603 } 7604 } 7605 7606 // If we had any tags defined in the function prototype, 7607 // introduce them into the function scope. 7608 if (FnBodyScope) { 7609 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(), 7610 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) { 7611 NamedDecl *D = *I; 7612 7613 // Some of these decls (like enums) may have been pinned to the translation unit 7614 // for lack of a real context earlier. If so, remove from the translation unit 7615 // and reattach to the current context. 7616 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) { 7617 // Is the decl actually in the context? 7618 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(), 7619 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) { 7620 if (*DI == D) { 7621 Context.getTranslationUnitDecl()->removeDecl(D); 7622 break; 7623 } 7624 } 7625 // Either way, reassign the lexical decl context to our FunctionDecl. 7626 D->setLexicalDeclContext(CurContext); 7627 } 7628 7629 // If the decl has a non-null name, make accessible in the current scope. 7630 if (!D->getName().empty()) 7631 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false); 7632 7633 // Similarly, dive into enums and fish their constants out, making them 7634 // accessible in this scope. 7635 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) { 7636 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(), 7637 EE = ED->enumerator_end(); EI != EE; ++EI) 7638 PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false); 7639 } 7640 } 7641 } 7642 7643 // Ensure that the function's exception specification is instantiated. 7644 if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>()) 7645 ResolveExceptionSpec(D->getLocation(), FPT); 7646 7647 // Checking attributes of current function definition 7648 // dllimport attribute. 7649 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7650 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7651 // dllimport attribute cannot be directly applied to definition. 7652 // Microsoft accepts dllimport for functions defined within class scope. 7653 if (!DA->isInherited() && 7654 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7655 Diag(FD->getLocation(), 7656 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7657 << "dllimport"; 7658 FD->setInvalidDecl(); 7659 return FD; 7660 } 7661 7662 // Visual C++ appears to not think this is an issue, so only issue 7663 // a warning when Microsoft extensions are disabled. 7664 if (!LangOpts.MicrosoftExt) { 7665 // If a symbol previously declared dllimport is later defined, the 7666 // attribute is ignored in subsequent references, and a warning is 7667 // emitted. 7668 Diag(FD->getLocation(), 7669 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7670 << FD->getName() << "dllimport"; 7671 } 7672 } 7673 return FD; 7674} 7675 7676/// \brief Given the set of return statements within a function body, 7677/// compute the variables that are subject to the named return value 7678/// optimization. 7679/// 7680/// Each of the variables that is subject to the named return value 7681/// optimization will be marked as NRVO variables in the AST, and any 7682/// return statement that has a marked NRVO variable as its NRVO candidate can 7683/// use the named return value optimization. 7684/// 7685/// This function applies a very simplistic algorithm for NRVO: if every return 7686/// statement in the function has the same NRVO candidate, that candidate is 7687/// the NRVO variable. 7688/// 7689/// FIXME: Employ a smarter algorithm that accounts for multiple return 7690/// statements and the lifetimes of the NRVO candidates. We should be able to 7691/// find a maximal set of NRVO variables. 7692void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7693 ReturnStmt **Returns = Scope->Returns.data(); 7694 7695 const VarDecl *NRVOCandidate = 0; 7696 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7697 if (!Returns[I]->getNRVOCandidate()) 7698 return; 7699 7700 if (!NRVOCandidate) 7701 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7702 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7703 return; 7704 } 7705 7706 if (NRVOCandidate) 7707 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7708} 7709 7710Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7711 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7712} 7713 7714Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7715 bool IsInstantiation) { 7716 FunctionDecl *FD = 0; 7717 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7718 if (FunTmpl) 7719 FD = FunTmpl->getTemplatedDecl(); 7720 else 7721 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7722 7723 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7724 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7725 7726 if (FD) { 7727 FD->setBody(Body); 7728 7729 // If the function implicitly returns zero (like 'main') or is naked, 7730 // don't complain about missing return statements. 7731 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) 7732 WP.disableCheckFallThrough(); 7733 7734 // MSVC permits the use of pure specifier (=0) on function definition, 7735 // defined at class scope, warn about this non standard construct. 7736 if (getLangOpts().MicrosoftExt && FD->isPure()) 7737 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7738 7739 if (!FD->isInvalidDecl()) { 7740 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7741 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7742 FD->getResultType(), FD); 7743 7744 // If this is a constructor, we need a vtable. 7745 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7746 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7747 7748 // Try to apply the named return value optimization. We have to check 7749 // if we can do this here because lambdas keep return statements around 7750 // to deduce an implicit return type. 7751 if (getLangOpts().CPlusPlus && FD->getResultType()->isRecordType() && 7752 !FD->isDependentContext()) 7753 computeNRVO(Body, getCurFunction()); 7754 } 7755 7756 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 7757 "Function parsing confused"); 7758 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7759 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7760 MD->setBody(Body); 7761 if (!MD->isInvalidDecl()) { 7762 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7763 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7764 MD->getResultType(), MD); 7765 7766 if (Body) 7767 computeNRVO(Body, getCurFunction()); 7768 } 7769 if (ObjCShouldCallSuperDealloc) { 7770 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7771 ObjCShouldCallSuperDealloc = false; 7772 } 7773 if (ObjCShouldCallSuperFinalize) { 7774 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7775 ObjCShouldCallSuperFinalize = false; 7776 } 7777 } else { 7778 return 0; 7779 } 7780 7781 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7782 "ObjC methods, which should have been handled in the block above."); 7783 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7784 "ObjC methods, which should have been handled in the block above."); 7785 7786 // Verify and clean out per-function state. 7787 if (Body) { 7788 // C++ constructors that have function-try-blocks can't have return 7789 // statements in the handlers of that block. (C++ [except.handle]p14) 7790 // Verify this. 7791 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7792 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7793 7794 // Verify that gotos and switch cases don't jump into scopes illegally. 7795 if (getCurFunction()->NeedsScopeChecking() && 7796 !dcl->isInvalidDecl() && 7797 !hasAnyUnrecoverableErrorsInThisFunction()) 7798 DiagnoseInvalidJumps(Body); 7799 7800 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7801 if (!Destructor->getParent()->isDependentType()) 7802 CheckDestructor(Destructor); 7803 7804 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7805 Destructor->getParent()); 7806 } 7807 7808 // If any errors have occurred, clear out any temporaries that may have 7809 // been leftover. This ensures that these temporaries won't be picked up for 7810 // deletion in some later function. 7811 if (PP.getDiagnostics().hasErrorOccurred() || 7812 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7813 DiscardCleanupsInEvaluationContext(); 7814 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7815 // Since the body is valid, issue any analysis-based warnings that are 7816 // enabled. 7817 ActivePolicy = &WP; 7818 } 7819 7820 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7821 (!CheckConstexprFunctionDecl(FD) || 7822 !CheckConstexprFunctionBody(FD, Body))) 7823 FD->setInvalidDecl(); 7824 7825 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7826 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7827 assert(MaybeODRUseExprs.empty() && 7828 "Leftover expressions for odr-use checking"); 7829 } 7830 7831 if (!IsInstantiation) 7832 PopDeclContext(); 7833 7834 PopFunctionScopeInfo(ActivePolicy, dcl); 7835 7836 // If any errors have occurred, clear out any temporaries that may have 7837 // been leftover. This ensures that these temporaries won't be picked up for 7838 // deletion in some later function. 7839 if (getDiagnostics().hasErrorOccurred()) { 7840 DiscardCleanupsInEvaluationContext(); 7841 } 7842 7843 return dcl; 7844} 7845 7846 7847/// When we finish delayed parsing of an attribute, we must attach it to the 7848/// relevant Decl. 7849void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7850 ParsedAttributes &Attrs) { 7851 // Always attach attributes to the underlying decl. 7852 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7853 D = TD->getTemplatedDecl(); 7854 ProcessDeclAttributeList(S, D, Attrs.getList()); 7855 7856 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D)) 7857 if (Method->isStatic()) 7858 checkThisInStaticMemberFunctionAttributes(Method); 7859} 7860 7861 7862/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7863/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7864NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7865 IdentifierInfo &II, Scope *S) { 7866 // Before we produce a declaration for an implicitly defined 7867 // function, see whether there was a locally-scoped declaration of 7868 // this name as a function or variable. If so, use that 7869 // (non-visible) declaration, and complain about it. 7870 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7871 = findLocallyScopedExternalDecl(&II); 7872 if (Pos != LocallyScopedExternalDecls.end()) { 7873 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7874 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7875 return Pos->second; 7876 } 7877 7878 // Extension in C99. Legal in C90, but warn about it. 7879 unsigned diag_id; 7880 if (II.getName().startswith("__builtin_")) 7881 diag_id = diag::warn_builtin_unknown; 7882 else if (getLangOpts().C99) 7883 diag_id = diag::ext_implicit_function_decl; 7884 else 7885 diag_id = diag::warn_implicit_function_decl; 7886 Diag(Loc, diag_id) << &II; 7887 7888 // Because typo correction is expensive, only do it if the implicit 7889 // function declaration is going to be treated as an error. 7890 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7891 TypoCorrection Corrected; 7892 DeclFilterCCC<FunctionDecl> Validator; 7893 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7894 LookupOrdinaryName, S, 0, Validator))) { 7895 std::string CorrectedStr = Corrected.getAsString(getLangOpts()); 7896 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts()); 7897 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7898 7899 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7900 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7901 7902 if (Func->getLocation().isValid() 7903 && !II.getName().startswith("__builtin_")) 7904 Diag(Func->getLocation(), diag::note_previous_decl) 7905 << CorrectedQuotedStr; 7906 } 7907 } 7908 7909 // Set a Declarator for the implicit definition: int foo(); 7910 const char *Dummy; 7911 AttributeFactory attrFactory; 7912 DeclSpec DS(attrFactory); 7913 unsigned DiagID; 7914 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7915 (void)Error; // Silence warning. 7916 assert(!Error && "Error setting up implicit decl!"); 7917 Declarator D(DS, Declarator::BlockContext); 7918 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7919 0, 0, true, SourceLocation(), 7920 SourceLocation(), SourceLocation(), 7921 SourceLocation(), 7922 EST_None, SourceLocation(), 7923 0, 0, 0, 0, Loc, Loc, D), 7924 DS.getAttributes(), 7925 SourceLocation()); 7926 D.SetIdentifier(&II, Loc); 7927 7928 // Insert this function into translation-unit scope. 7929 7930 DeclContext *PrevDC = CurContext; 7931 CurContext = Context.getTranslationUnitDecl(); 7932 7933 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7934 FD->setImplicit(); 7935 7936 CurContext = PrevDC; 7937 7938 AddKnownFunctionAttributes(FD); 7939 7940 return FD; 7941} 7942 7943/// \brief Adds any function attributes that we know a priori based on 7944/// the declaration of this function. 7945/// 7946/// These attributes can apply both to implicitly-declared builtins 7947/// (like __builtin___printf_chk) or to library-declared functions 7948/// like NSLog or printf. 7949/// 7950/// We need to check for duplicate attributes both here and where user-written 7951/// attributes are applied to declarations. 7952void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7953 if (FD->isInvalidDecl()) 7954 return; 7955 7956 // If this is a built-in function, map its builtin attributes to 7957 // actual attributes. 7958 if (unsigned BuiltinID = FD->getBuiltinID()) { 7959 // Handle printf-formatting attributes. 7960 unsigned FormatIdx; 7961 bool HasVAListArg; 7962 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7963 if (!FD->getAttr<FormatAttr>()) { 7964 const char *fmt = "printf"; 7965 unsigned int NumParams = FD->getNumParams(); 7966 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7967 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7968 fmt = "NSString"; 7969 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7970 fmt, FormatIdx+1, 7971 HasVAListArg ? 0 : FormatIdx+2)); 7972 } 7973 } 7974 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7975 HasVAListArg)) { 7976 if (!FD->getAttr<FormatAttr>()) 7977 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7978 "scanf", FormatIdx+1, 7979 HasVAListArg ? 0 : FormatIdx+2)); 7980 } 7981 7982 // Mark const if we don't care about errno and that is the only 7983 // thing preventing the function from being const. This allows 7984 // IRgen to use LLVM intrinsics for such functions. 7985 if (!getLangOpts().MathErrno && 7986 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7987 if (!FD->getAttr<ConstAttr>()) 7988 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7989 } 7990 7991 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7992 !FD->getAttr<ReturnsTwiceAttr>()) 7993 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7994 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7995 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7996 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7997 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7998 } 7999 8000 IdentifierInfo *Name = FD->getIdentifier(); 8001 if (!Name) 8002 return; 8003 if ((!getLangOpts().CPlusPlus && 8004 FD->getDeclContext()->isTranslationUnit()) || 8005 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 8006 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 8007 LinkageSpecDecl::lang_c)) { 8008 // Okay: this could be a libc/libm/Objective-C function we know 8009 // about. 8010 } else 8011 return; 8012 8013 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 8014 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 8015 // target-specific builtins, perhaps? 8016 if (!FD->getAttr<FormatAttr>()) 8017 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 8018 "printf", 2, 8019 Name->isStr("vasprintf") ? 0 : 3)); 8020 } 8021} 8022 8023TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 8024 TypeSourceInfo *TInfo) { 8025 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 8026 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 8027 8028 if (!TInfo) { 8029 assert(D.isInvalidType() && "no declarator info for valid type"); 8030 TInfo = Context.getTrivialTypeSourceInfo(T); 8031 } 8032 8033 // Scope manipulation handled by caller. 8034 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 8035 D.getLocStart(), 8036 D.getIdentifierLoc(), 8037 D.getIdentifier(), 8038 TInfo); 8039 8040 // Bail out immediately if we have an invalid declaration. 8041 if (D.isInvalidType()) { 8042 NewTD->setInvalidDecl(); 8043 return NewTD; 8044 } 8045 8046 if (D.getDeclSpec().isModulePrivateSpecified()) { 8047 if (CurContext->isFunctionOrMethod()) 8048 Diag(NewTD->getLocation(), diag::err_module_private_local) 8049 << 2 << NewTD->getDeclName() 8050 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 8051 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 8052 else 8053 NewTD->setModulePrivate(); 8054 } 8055 8056 // C++ [dcl.typedef]p8: 8057 // If the typedef declaration defines an unnamed class (or 8058 // enum), the first typedef-name declared by the declaration 8059 // to be that class type (or enum type) is used to denote the 8060 // class type (or enum type) for linkage purposes only. 8061 // We need to check whether the type was declared in the declaration. 8062 switch (D.getDeclSpec().getTypeSpecType()) { 8063 case TST_enum: 8064 case TST_struct: 8065 case TST_union: 8066 case TST_class: { 8067 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 8068 8069 // Do nothing if the tag is not anonymous or already has an 8070 // associated typedef (from an earlier typedef in this decl group). 8071 if (tagFromDeclSpec->getIdentifier()) break; 8072 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 8073 8074 // A well-formed anonymous tag must always be a TUK_Definition. 8075 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 8076 8077 // The type must match the tag exactly; no qualifiers allowed. 8078 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 8079 break; 8080 8081 // Otherwise, set this is the anon-decl typedef for the tag. 8082 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 8083 break; 8084 } 8085 8086 default: 8087 break; 8088 } 8089 8090 return NewTD; 8091} 8092 8093 8094/// \brief Check that this is a valid underlying type for an enum declaration. 8095bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) { 8096 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 8097 QualType T = TI->getType(); 8098 8099 if (T->isDependentType() || T->isIntegralType(Context)) 8100 return false; 8101 8102 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T; 8103 return true; 8104} 8105 8106/// Check whether this is a valid redeclaration of a previous enumeration. 8107/// \return true if the redeclaration was invalid. 8108bool Sema::CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped, 8109 QualType EnumUnderlyingTy, 8110 const EnumDecl *Prev) { 8111 bool IsFixed = !EnumUnderlyingTy.isNull(); 8112 8113 if (IsScoped != Prev->isScoped()) { 8114 Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch) 8115 << Prev->isScoped(); 8116 Diag(Prev->getLocation(), diag::note_previous_use); 8117 return true; 8118 } 8119 8120 if (IsFixed && Prev->isFixed()) { 8121 if (!EnumUnderlyingTy->isDependentType() && 8122 !Prev->getIntegerType()->isDependentType() && 8123 !Context.hasSameUnqualifiedType(EnumUnderlyingTy, 8124 Prev->getIntegerType())) { 8125 Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch) 8126 << EnumUnderlyingTy << Prev->getIntegerType(); 8127 Diag(Prev->getLocation(), diag::note_previous_use); 8128 return true; 8129 } 8130 } else if (IsFixed != Prev->isFixed()) { 8131 Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch) 8132 << Prev->isFixed(); 8133 Diag(Prev->getLocation(), diag::note_previous_use); 8134 return true; 8135 } 8136 8137 return false; 8138} 8139 8140/// \brief Determine whether a tag with a given kind is acceptable 8141/// as a redeclaration of the given tag declaration. 8142/// 8143/// \returns true if the new tag kind is acceptable, false otherwise. 8144bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 8145 TagTypeKind NewTag, bool isDefinition, 8146 SourceLocation NewTagLoc, 8147 const IdentifierInfo &Name) { 8148 // C++ [dcl.type.elab]p3: 8149 // The class-key or enum keyword present in the 8150 // elaborated-type-specifier shall agree in kind with the 8151 // declaration to which the name in the elaborated-type-specifier 8152 // refers. This rule also applies to the form of 8153 // elaborated-type-specifier that declares a class-name or 8154 // friend class since it can be construed as referring to the 8155 // definition of the class. Thus, in any 8156 // elaborated-type-specifier, the enum keyword shall be used to 8157 // refer to an enumeration (7.2), the union class-key shall be 8158 // used to refer to a union (clause 9), and either the class or 8159 // struct class-key shall be used to refer to a class (clause 9) 8160 // declared using the class or struct class-key. 8161 TagTypeKind OldTag = Previous->getTagKind(); 8162 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 8163 if (OldTag == NewTag) 8164 return true; 8165 8166 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 8167 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 8168 // Warn about the struct/class tag mismatch. 8169 bool isTemplate = false; 8170 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 8171 isTemplate = Record->getDescribedClassTemplate(); 8172 8173 if (!ActiveTemplateInstantiations.empty()) { 8174 // In a template instantiation, do not offer fix-its for tag mismatches 8175 // since they usually mess up the template instead of fixing the problem. 8176 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 8177 << (NewTag == TTK_Class) << isTemplate << &Name; 8178 return true; 8179 } 8180 8181 if (isDefinition) { 8182 // On definitions, check previous tags and issue a fix-it for each 8183 // one that doesn't match the current tag. 8184 if (Previous->getDefinition()) { 8185 // Don't suggest fix-its for redefinitions. 8186 return true; 8187 } 8188 8189 bool previousMismatch = false; 8190 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 8191 E(Previous->redecls_end()); I != E; ++I) { 8192 if (I->getTagKind() != NewTag) { 8193 if (!previousMismatch) { 8194 previousMismatch = true; 8195 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 8196 << (NewTag == TTK_Class) << isTemplate << &Name; 8197 } 8198 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 8199 << (NewTag == TTK_Class) 8200 << FixItHint::CreateReplacement(I->getInnerLocStart(), 8201 NewTag == TTK_Class? 8202 "class" : "struct"); 8203 } 8204 } 8205 return true; 8206 } 8207 8208 // Check for a previous definition. If current tag and definition 8209 // are same type, do nothing. If no definition, but disagree with 8210 // with previous tag type, give a warning, but no fix-it. 8211 const TagDecl *Redecl = Previous->getDefinition() ? 8212 Previous->getDefinition() : Previous; 8213 if (Redecl->getTagKind() == NewTag) { 8214 return true; 8215 } 8216 8217 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 8218 << (NewTag == TTK_Class) 8219 << isTemplate << &Name; 8220 Diag(Redecl->getLocation(), diag::note_previous_use); 8221 8222 // If there is a previous defintion, suggest a fix-it. 8223 if (Previous->getDefinition()) { 8224 Diag(NewTagLoc, diag::note_struct_class_suggestion) 8225 << (Redecl->getTagKind() == TTK_Class) 8226 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 8227 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 8228 } 8229 8230 return true; 8231 } 8232 return false; 8233} 8234 8235/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 8236/// former case, Name will be non-null. In the later case, Name will be null. 8237/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 8238/// reference/declaration/definition of a tag. 8239Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 8240 SourceLocation KWLoc, CXXScopeSpec &SS, 8241 IdentifierInfo *Name, SourceLocation NameLoc, 8242 AttributeList *Attr, AccessSpecifier AS, 8243 SourceLocation ModulePrivateLoc, 8244 MultiTemplateParamsArg TemplateParameterLists, 8245 bool &OwnedDecl, bool &IsDependent, 8246 SourceLocation ScopedEnumKWLoc, 8247 bool ScopedEnumUsesClassTag, 8248 TypeResult UnderlyingType) { 8249 // If this is not a definition, it must have a name. 8250 IdentifierInfo *OrigName = Name; 8251 assert((Name != 0 || TUK == TUK_Definition) && 8252 "Nameless record must be a definition!"); 8253 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 8254 8255 OwnedDecl = false; 8256 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8257 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 8258 8259 // FIXME: Check explicit specializations more carefully. 8260 bool isExplicitSpecialization = false; 8261 bool Invalid = false; 8262 8263 // We only need to do this matching if we have template parameters 8264 // or a scope specifier, which also conveniently avoids this work 8265 // for non-C++ cases. 8266 if (TemplateParameterLists.size() > 0 || 8267 (SS.isNotEmpty() && TUK != TUK_Reference)) { 8268 if (TemplateParameterList *TemplateParams 8269 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 8270 TemplateParameterLists.get(), 8271 TemplateParameterLists.size(), 8272 TUK == TUK_Friend, 8273 isExplicitSpecialization, 8274 Invalid)) { 8275 if (TemplateParams->size() > 0) { 8276 // This is a declaration or definition of a class template (which may 8277 // be a member of another template). 8278 8279 if (Invalid) 8280 return 0; 8281 8282 OwnedDecl = false; 8283 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 8284 SS, Name, NameLoc, Attr, 8285 TemplateParams, AS, 8286 ModulePrivateLoc, 8287 TemplateParameterLists.size() - 1, 8288 (TemplateParameterList**) TemplateParameterLists.release()); 8289 return Result.get(); 8290 } else { 8291 // The "template<>" header is extraneous. 8292 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8293 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8294 isExplicitSpecialization = true; 8295 } 8296 } 8297 } 8298 8299 // Figure out the underlying type if this a enum declaration. We need to do 8300 // this early, because it's needed to detect if this is an incompatible 8301 // redeclaration. 8302 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 8303 8304 if (Kind == TTK_Enum) { 8305 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 8306 // No underlying type explicitly specified, or we failed to parse the 8307 // type, default to int. 8308 EnumUnderlying = Context.IntTy.getTypePtr(); 8309 else if (UnderlyingType.get()) { 8310 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 8311 // integral type; any cv-qualification is ignored. 8312 TypeSourceInfo *TI = 0; 8313 GetTypeFromParser(UnderlyingType.get(), &TI); 8314 EnumUnderlying = TI; 8315 8316 if (CheckEnumUnderlyingType(TI)) 8317 // Recover by falling back to int. 8318 EnumUnderlying = Context.IntTy.getTypePtr(); 8319 8320 if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI, 8321 UPPC_FixedUnderlyingType)) 8322 EnumUnderlying = Context.IntTy.getTypePtr(); 8323 8324 } else if (getLangOpts().MicrosoftMode) 8325 // Microsoft enums are always of int type. 8326 EnumUnderlying = Context.IntTy.getTypePtr(); 8327 } 8328 8329 DeclContext *SearchDC = CurContext; 8330 DeclContext *DC = CurContext; 8331 bool isStdBadAlloc = false; 8332 8333 RedeclarationKind Redecl = ForRedeclaration; 8334 if (TUK == TUK_Friend || TUK == TUK_Reference) 8335 Redecl = NotForRedeclaration; 8336 8337 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 8338 8339 if (Name && SS.isNotEmpty()) { 8340 // We have a nested-name tag ('struct foo::bar'). 8341 8342 // Check for invalid 'foo::'. 8343 if (SS.isInvalid()) { 8344 Name = 0; 8345 goto CreateNewDecl; 8346 } 8347 8348 // If this is a friend or a reference to a class in a dependent 8349 // context, don't try to make a decl for it. 8350 if (TUK == TUK_Friend || TUK == TUK_Reference) { 8351 DC = computeDeclContext(SS, false); 8352 if (!DC) { 8353 IsDependent = true; 8354 return 0; 8355 } 8356 } else { 8357 DC = computeDeclContext(SS, true); 8358 if (!DC) { 8359 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 8360 << SS.getRange(); 8361 return 0; 8362 } 8363 } 8364 8365 if (RequireCompleteDeclContext(SS, DC)) 8366 return 0; 8367 8368 SearchDC = DC; 8369 // Look-up name inside 'foo::'. 8370 LookupQualifiedName(Previous, DC); 8371 8372 if (Previous.isAmbiguous()) 8373 return 0; 8374 8375 if (Previous.empty()) { 8376 // Name lookup did not find anything. However, if the 8377 // nested-name-specifier refers to the current instantiation, 8378 // and that current instantiation has any dependent base 8379 // classes, we might find something at instantiation time: treat 8380 // this as a dependent elaborated-type-specifier. 8381 // But this only makes any sense for reference-like lookups. 8382 if (Previous.wasNotFoundInCurrentInstantiation() && 8383 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8384 IsDependent = true; 8385 return 0; 8386 } 8387 8388 // A tag 'foo::bar' must already exist. 8389 Diag(NameLoc, diag::err_not_tag_in_scope) 8390 << Kind << Name << DC << SS.getRange(); 8391 Name = 0; 8392 Invalid = true; 8393 goto CreateNewDecl; 8394 } 8395 } else if (Name) { 8396 // If this is a named struct, check to see if there was a previous forward 8397 // declaration or definition. 8398 // FIXME: We're looking into outer scopes here, even when we 8399 // shouldn't be. Doing so can result in ambiguities that we 8400 // shouldn't be diagnosing. 8401 LookupName(Previous, S); 8402 8403 if (Previous.isAmbiguous() && 8404 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 8405 LookupResult::Filter F = Previous.makeFilter(); 8406 while (F.hasNext()) { 8407 NamedDecl *ND = F.next(); 8408 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 8409 F.erase(); 8410 } 8411 F.done(); 8412 } 8413 8414 // Note: there used to be some attempt at recovery here. 8415 if (Previous.isAmbiguous()) 8416 return 0; 8417 8418 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) { 8419 // FIXME: This makes sure that we ignore the contexts associated 8420 // with C structs, unions, and enums when looking for a matching 8421 // tag declaration or definition. See the similar lookup tweak 8422 // in Sema::LookupName; is there a better way to deal with this? 8423 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 8424 SearchDC = SearchDC->getParent(); 8425 } 8426 } else if (S->isFunctionPrototypeScope()) { 8427 // If this is an enum declaration in function prototype scope, set its 8428 // initial context to the translation unit. 8429 // FIXME: [citation needed] 8430 SearchDC = Context.getTranslationUnitDecl(); 8431 } 8432 8433 if (Previous.isSingleResult() && 8434 Previous.getFoundDecl()->isTemplateParameter()) { 8435 // Maybe we will complain about the shadowed template parameter. 8436 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 8437 // Just pretend that we didn't see the previous declaration. 8438 Previous.clear(); 8439 } 8440 8441 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace && 8442 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 8443 // This is a declaration of or a reference to "std::bad_alloc". 8444 isStdBadAlloc = true; 8445 8446 if (Previous.empty() && StdBadAlloc) { 8447 // std::bad_alloc has been implicitly declared (but made invisible to 8448 // name lookup). Fill in this implicit declaration as the previous 8449 // declaration, so that the declarations get chained appropriately. 8450 Previous.addDecl(getStdBadAlloc()); 8451 } 8452 } 8453 8454 // If we didn't find a previous declaration, and this is a reference 8455 // (or friend reference), move to the correct scope. In C++, we 8456 // also need to do a redeclaration lookup there, just in case 8457 // there's a shadow friend decl. 8458 if (Name && Previous.empty() && 8459 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8460 if (Invalid) goto CreateNewDecl; 8461 assert(SS.isEmpty()); 8462 8463 if (TUK == TUK_Reference) { 8464 // C++ [basic.scope.pdecl]p5: 8465 // -- for an elaborated-type-specifier of the form 8466 // 8467 // class-key identifier 8468 // 8469 // if the elaborated-type-specifier is used in the 8470 // decl-specifier-seq or parameter-declaration-clause of a 8471 // function defined in namespace scope, the identifier is 8472 // declared as a class-name in the namespace that contains 8473 // the declaration; otherwise, except as a friend 8474 // declaration, the identifier is declared in the smallest 8475 // non-class, non-function-prototype scope that contains the 8476 // declaration. 8477 // 8478 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 8479 // C structs and unions. 8480 // 8481 // It is an error in C++ to declare (rather than define) an enum 8482 // type, including via an elaborated type specifier. We'll 8483 // diagnose that later; for now, declare the enum in the same 8484 // scope as we would have picked for any other tag type. 8485 // 8486 // GNU C also supports this behavior as part of its incomplete 8487 // enum types extension, while GNU C++ does not. 8488 // 8489 // Find the context where we'll be declaring the tag. 8490 // FIXME: We would like to maintain the current DeclContext as the 8491 // lexical context, 8492 while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod()) 8493 SearchDC = SearchDC->getParent(); 8494 8495 // Find the scope where we'll be declaring the tag. 8496 while (S->isClassScope() || 8497 (getLangOpts().CPlusPlus && 8498 S->isFunctionPrototypeScope()) || 8499 ((S->getFlags() & Scope::DeclScope) == 0) || 8500 (S->getEntity() && 8501 ((DeclContext *)S->getEntity())->isTransparentContext())) 8502 S = S->getParent(); 8503 } else { 8504 assert(TUK == TUK_Friend); 8505 // C++ [namespace.memdef]p3: 8506 // If a friend declaration in a non-local class first declares a 8507 // class or function, the friend class or function is a member of 8508 // the innermost enclosing namespace. 8509 SearchDC = SearchDC->getEnclosingNamespaceContext(); 8510 } 8511 8512 // In C++, we need to do a redeclaration lookup to properly 8513 // diagnose some problems. 8514 if (getLangOpts().CPlusPlus) { 8515 Previous.setRedeclarationKind(ForRedeclaration); 8516 LookupQualifiedName(Previous, SearchDC); 8517 } 8518 } 8519 8520 if (!Previous.empty()) { 8521 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 8522 8523 // It's okay to have a tag decl in the same scope as a typedef 8524 // which hides a tag decl in the same scope. Finding this 8525 // insanity with a redeclaration lookup can only actually happen 8526 // in C++. 8527 // 8528 // This is also okay for elaborated-type-specifiers, which is 8529 // technically forbidden by the current standard but which is 8530 // okay according to the likely resolution of an open issue; 8531 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 8532 if (getLangOpts().CPlusPlus) { 8533 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8534 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 8535 TagDecl *Tag = TT->getDecl(); 8536 if (Tag->getDeclName() == Name && 8537 Tag->getDeclContext()->getRedeclContext() 8538 ->Equals(TD->getDeclContext()->getRedeclContext())) { 8539 PrevDecl = Tag; 8540 Previous.clear(); 8541 Previous.addDecl(Tag); 8542 Previous.resolveKind(); 8543 } 8544 } 8545 } 8546 } 8547 8548 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 8549 // If this is a use of a previous tag, or if the tag is already declared 8550 // in the same scope (so that the definition/declaration completes or 8551 // rementions the tag), reuse the decl. 8552 if (TUK == TUK_Reference || TUK == TUK_Friend || 8553 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 8554 // Make sure that this wasn't declared as an enum and now used as a 8555 // struct or something similar. 8556 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 8557 TUK == TUK_Definition, KWLoc, 8558 *Name)) { 8559 bool SafeToContinue 8560 = (PrevTagDecl->getTagKind() != TTK_Enum && 8561 Kind != TTK_Enum); 8562 if (SafeToContinue) 8563 Diag(KWLoc, diag::err_use_with_wrong_tag) 8564 << Name 8565 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8566 PrevTagDecl->getKindName()); 8567 else 8568 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8569 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8570 8571 if (SafeToContinue) 8572 Kind = PrevTagDecl->getTagKind(); 8573 else { 8574 // Recover by making this an anonymous redefinition. 8575 Name = 0; 8576 Previous.clear(); 8577 Invalid = true; 8578 } 8579 } 8580 8581 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8582 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8583 8584 // If this is an elaborated-type-specifier for a scoped enumeration, 8585 // the 'class' keyword is not necessary and not permitted. 8586 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8587 if (ScopedEnum) 8588 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8589 << PrevEnum->isScoped() 8590 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8591 return PrevTagDecl; 8592 } 8593 8594 QualType EnumUnderlyingTy; 8595 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8596 EnumUnderlyingTy = TI->getType(); 8597 else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>()) 8598 EnumUnderlyingTy = QualType(T, 0); 8599 8600 // All conflicts with previous declarations are recovered by 8601 // returning the previous declaration, unless this is a definition, 8602 // in which case we want the caller to bail out. 8603 if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc, 8604 ScopedEnum, EnumUnderlyingTy, PrevEnum)) 8605 return TUK == TUK_Declaration ? PrevTagDecl : 0; 8606 } 8607 8608 if (!Invalid) { 8609 // If this is a use, just return the declaration we found. 8610 8611 // FIXME: In the future, return a variant or some other clue 8612 // for the consumer of this Decl to know it doesn't own it. 8613 // For our current ASTs this shouldn't be a problem, but will 8614 // need to be changed with DeclGroups. 8615 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8616 getLangOpts().MicrosoftExt)) || TUK == TUK_Friend) 8617 return PrevTagDecl; 8618 8619 // Diagnose attempts to redefine a tag. 8620 if (TUK == TUK_Definition) { 8621 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8622 // If we're defining a specialization and the previous definition 8623 // is from an implicit instantiation, don't emit an error 8624 // here; we'll catch this in the general case below. 8625 bool IsExplicitSpecializationAfterInstantiation = false; 8626 if (isExplicitSpecialization) { 8627 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def)) 8628 IsExplicitSpecializationAfterInstantiation = 8629 RD->getTemplateSpecializationKind() != 8630 TSK_ExplicitSpecialization; 8631 else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def)) 8632 IsExplicitSpecializationAfterInstantiation = 8633 ED->getTemplateSpecializationKind() != 8634 TSK_ExplicitSpecialization; 8635 } 8636 8637 if (!IsExplicitSpecializationAfterInstantiation) { 8638 // A redeclaration in function prototype scope in C isn't 8639 // visible elsewhere, so merely issue a warning. 8640 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope()) 8641 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name; 8642 else 8643 Diag(NameLoc, diag::err_redefinition) << Name; 8644 Diag(Def->getLocation(), diag::note_previous_definition); 8645 // If this is a redefinition, recover by making this 8646 // struct be anonymous, which will make any later 8647 // references get the previous definition. 8648 Name = 0; 8649 Previous.clear(); 8650 Invalid = true; 8651 } 8652 } else { 8653 // If the type is currently being defined, complain 8654 // about a nested redefinition. 8655 const TagType *Tag 8656 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8657 if (Tag->isBeingDefined()) { 8658 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8659 Diag(PrevTagDecl->getLocation(), 8660 diag::note_previous_definition); 8661 Name = 0; 8662 Previous.clear(); 8663 Invalid = true; 8664 } 8665 } 8666 8667 // Okay, this is definition of a previously declared or referenced 8668 // tag PrevDecl. We're going to create a new Decl for it. 8669 } 8670 } 8671 // If we get here we have (another) forward declaration or we 8672 // have a definition. Just create a new decl. 8673 8674 } else { 8675 // If we get here, this is a definition of a new tag type in a nested 8676 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8677 // new decl/type. We set PrevDecl to NULL so that the entities 8678 // have distinct types. 8679 Previous.clear(); 8680 } 8681 // If we get here, we're going to create a new Decl. If PrevDecl 8682 // is non-NULL, it's a definition of the tag declared by 8683 // PrevDecl. If it's NULL, we have a new definition. 8684 8685 8686 // Otherwise, PrevDecl is not a tag, but was found with tag 8687 // lookup. This is only actually possible in C++, where a few 8688 // things like templates still live in the tag namespace. 8689 } else { 8690 // Use a better diagnostic if an elaborated-type-specifier 8691 // found the wrong kind of type on the first 8692 // (non-redeclaration) lookup. 8693 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8694 !Previous.isForRedeclaration()) { 8695 unsigned Kind = 0; 8696 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8697 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8698 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8699 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8700 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8701 Invalid = true; 8702 8703 // Otherwise, only diagnose if the declaration is in scope. 8704 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8705 isExplicitSpecialization)) { 8706 // do nothing 8707 8708 // Diagnose implicit declarations introduced by elaborated types. 8709 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8710 unsigned Kind = 0; 8711 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8712 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8713 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8714 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8715 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8716 Invalid = true; 8717 8718 // Otherwise it's a declaration. Call out a particularly common 8719 // case here. 8720 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8721 unsigned Kind = 0; 8722 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8723 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8724 << Name << Kind << TND->getUnderlyingType(); 8725 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8726 Invalid = true; 8727 8728 // Otherwise, diagnose. 8729 } else { 8730 // The tag name clashes with something else in the target scope, 8731 // issue an error and recover by making this tag be anonymous. 8732 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8733 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8734 Name = 0; 8735 Invalid = true; 8736 } 8737 8738 // The existing declaration isn't relevant to us; we're in a 8739 // new scope, so clear out the previous declaration. 8740 Previous.clear(); 8741 } 8742 } 8743 8744CreateNewDecl: 8745 8746 TagDecl *PrevDecl = 0; 8747 if (Previous.isSingleResult()) 8748 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8749 8750 // If there is an identifier, use the location of the identifier as the 8751 // location of the decl, otherwise use the location of the struct/union 8752 // keyword. 8753 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8754 8755 // Otherwise, create a new declaration. If there is a previous 8756 // declaration of the same entity, the two will be linked via 8757 // PrevDecl. 8758 TagDecl *New; 8759 8760 bool IsForwardReference = false; 8761 if (Kind == TTK_Enum) { 8762 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8763 // enum X { A, B, C } D; D should chain to X. 8764 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8765 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8766 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8767 // If this is an undefined enum, warn. 8768 if (TUK != TUK_Definition && !Invalid) { 8769 TagDecl *Def; 8770 if (getLangOpts().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8771 // C++0x: 7.2p2: opaque-enum-declaration. 8772 // Conflicts are diagnosed above. Do nothing. 8773 } 8774 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8775 Diag(Loc, diag::ext_forward_ref_enum_def) 8776 << New; 8777 Diag(Def->getLocation(), diag::note_previous_definition); 8778 } else { 8779 unsigned DiagID = diag::ext_forward_ref_enum; 8780 if (getLangOpts().MicrosoftMode) 8781 DiagID = diag::ext_ms_forward_ref_enum; 8782 else if (getLangOpts().CPlusPlus) 8783 DiagID = diag::err_forward_ref_enum; 8784 Diag(Loc, DiagID); 8785 8786 // If this is a forward-declared reference to an enumeration, make a 8787 // note of it; we won't actually be introducing the declaration into 8788 // the declaration context. 8789 if (TUK == TUK_Reference) 8790 IsForwardReference = true; 8791 } 8792 } 8793 8794 if (EnumUnderlying) { 8795 EnumDecl *ED = cast<EnumDecl>(New); 8796 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8797 ED->setIntegerTypeSourceInfo(TI); 8798 else 8799 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8800 ED->setPromotionType(ED->getIntegerType()); 8801 } 8802 8803 } else { 8804 // struct/union/class 8805 8806 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8807 // struct X { int A; } D; D should chain to X. 8808 if (getLangOpts().CPlusPlus) { 8809 // FIXME: Look for a way to use RecordDecl for simple structs. 8810 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8811 cast_or_null<CXXRecordDecl>(PrevDecl)); 8812 8813 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8814 StdBadAlloc = cast<CXXRecordDecl>(New); 8815 } else 8816 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8817 cast_or_null<RecordDecl>(PrevDecl)); 8818 } 8819 8820 // Maybe add qualifier info. 8821 if (SS.isNotEmpty()) { 8822 if (SS.isSet()) { 8823 // If this is either a declaration or a definition, check the 8824 // nested-name-specifier against the current context. We don't do this 8825 // for explicit specializations, because they have similar checking 8826 // (with more specific diagnostics) in the call to 8827 // CheckMemberSpecialization, below. 8828 if (!isExplicitSpecialization && 8829 (TUK == TUK_Definition || TUK == TUK_Declaration) && 8830 diagnoseQualifiedDeclaration(SS, DC, OrigName, NameLoc)) 8831 Invalid = true; 8832 8833 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8834 if (TemplateParameterLists.size() > 0) { 8835 New->setTemplateParameterListsInfo(Context, 8836 TemplateParameterLists.size(), 8837 (TemplateParameterList**) TemplateParameterLists.release()); 8838 } 8839 } 8840 else 8841 Invalid = true; 8842 } 8843 8844 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8845 // Add alignment attributes if necessary; these attributes are checked when 8846 // the ASTContext lays out the structure. 8847 // 8848 // It is important for implementing the correct semantics that this 8849 // happen here (in act on tag decl). The #pragma pack stack is 8850 // maintained as a result of parser callbacks which can occur at 8851 // many points during the parsing of a struct declaration (because 8852 // the #pragma tokens are effectively skipped over during the 8853 // parsing of the struct). 8854 AddAlignmentAttributesForRecord(RD); 8855 8856 AddMsStructLayoutForRecord(RD); 8857 } 8858 8859 if (ModulePrivateLoc.isValid()) { 8860 if (isExplicitSpecialization) 8861 Diag(New->getLocation(), diag::err_module_private_specialization) 8862 << 2 8863 << FixItHint::CreateRemoval(ModulePrivateLoc); 8864 // __module_private__ does not apply to local classes. However, we only 8865 // diagnose this as an error when the declaration specifiers are 8866 // freestanding. Here, we just ignore the __module_private__. 8867 else if (!SearchDC->isFunctionOrMethod()) 8868 New->setModulePrivate(); 8869 } 8870 8871 // If this is a specialization of a member class (of a class template), 8872 // check the specialization. 8873 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8874 Invalid = true; 8875 8876 if (Invalid) 8877 New->setInvalidDecl(); 8878 8879 if (Attr) 8880 ProcessDeclAttributeList(S, New, Attr); 8881 8882 // If we're declaring or defining a tag in function prototype scope 8883 // in C, note that this type can only be used within the function. 8884 if (Name && S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus) 8885 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8886 8887 // Set the lexical context. If the tag has a C++ scope specifier, the 8888 // lexical context will be different from the semantic context. 8889 New->setLexicalDeclContext(CurContext); 8890 8891 // Mark this as a friend decl if applicable. 8892 // In Microsoft mode, a friend declaration also acts as a forward 8893 // declaration so we always pass true to setObjectOfFriendDecl to make 8894 // the tag name visible. 8895 if (TUK == TUK_Friend) 8896 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8897 getLangOpts().MicrosoftExt); 8898 8899 // Set the access specifier. 8900 if (!Invalid && SearchDC->isRecord()) 8901 SetMemberAccessSpecifier(New, PrevDecl, AS); 8902 8903 if (TUK == TUK_Definition) 8904 New->startDefinition(); 8905 8906 // If this has an identifier, add it to the scope stack. 8907 if (TUK == TUK_Friend) { 8908 // We might be replacing an existing declaration in the lookup tables; 8909 // if so, borrow its access specifier. 8910 if (PrevDecl) 8911 New->setAccess(PrevDecl->getAccess()); 8912 8913 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8914 DC->makeDeclVisibleInContext(New); 8915 if (Name) // can be null along some error paths 8916 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8917 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8918 } else if (Name) { 8919 S = getNonFieldDeclScope(S); 8920 PushOnScopeChains(New, S, !IsForwardReference); 8921 if (IsForwardReference) 8922 SearchDC->makeDeclVisibleInContext(New); 8923 8924 } else { 8925 CurContext->addDecl(New); 8926 } 8927 8928 // If this is the C FILE type, notify the AST context. 8929 if (IdentifierInfo *II = New->getIdentifier()) 8930 if (!New->isInvalidDecl() && 8931 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8932 II->isStr("FILE")) 8933 Context.setFILEDecl(New); 8934 8935 // If we were in function prototype scope (and not in C++ mode), add this 8936 // tag to the list of decls to inject into the function definition scope. 8937 if (S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus && 8938 InFunctionDeclarator && Name) 8939 DeclsInPrototypeScope.push_back(New); 8940 8941 if (PrevDecl) 8942 mergeDeclAttributes(New, PrevDecl); 8943 8944 // If there's a #pragma GCC visibility in scope, set the visibility of this 8945 // record. 8946 AddPushedVisibilityAttribute(New); 8947 8948 OwnedDecl = true; 8949 return New; 8950} 8951 8952void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8953 AdjustDeclIfTemplate(TagD); 8954 TagDecl *Tag = cast<TagDecl>(TagD); 8955 8956 // Enter the tag context. 8957 PushDeclContext(S, Tag); 8958 8959 ActOnDocumentableDecl(TagD); 8960 8961 // If there's a #pragma GCC visibility in scope, set the visibility of this 8962 // record. 8963 AddPushedVisibilityAttribute(Tag); 8964} 8965 8966Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8967 assert(isa<ObjCContainerDecl>(IDecl) && 8968 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8969 DeclContext *OCD = cast<DeclContext>(IDecl); 8970 assert(getContainingDC(OCD) == CurContext && 8971 "The next DeclContext should be lexically contained in the current one."); 8972 CurContext = OCD; 8973 return IDecl; 8974} 8975 8976void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8977 SourceLocation FinalLoc, 8978 SourceLocation LBraceLoc) { 8979 AdjustDeclIfTemplate(TagD); 8980 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8981 8982 FieldCollector->StartClass(); 8983 8984 if (!Record->getIdentifier()) 8985 return; 8986 8987 if (FinalLoc.isValid()) 8988 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8989 8990 // C++ [class]p2: 8991 // [...] The class-name is also inserted into the scope of the 8992 // class itself; this is known as the injected-class-name. For 8993 // purposes of access checking, the injected-class-name is treated 8994 // as if it were a public member name. 8995 CXXRecordDecl *InjectedClassName 8996 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8997 Record->getLocStart(), Record->getLocation(), 8998 Record->getIdentifier(), 8999 /*PrevDecl=*/0, 9000 /*DelayTypeCreation=*/true); 9001 Context.getTypeDeclType(InjectedClassName, Record); 9002 InjectedClassName->setImplicit(); 9003 InjectedClassName->setAccess(AS_public); 9004 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 9005 InjectedClassName->setDescribedClassTemplate(Template); 9006 PushOnScopeChains(InjectedClassName, S); 9007 assert(InjectedClassName->isInjectedClassName() && 9008 "Broken injected-class-name"); 9009} 9010 9011void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 9012 SourceLocation RBraceLoc) { 9013 AdjustDeclIfTemplate(TagD); 9014 TagDecl *Tag = cast<TagDecl>(TagD); 9015 Tag->setRBraceLoc(RBraceLoc); 9016 9017 // Make sure we "complete" the definition even it is invalid. 9018 if (Tag->isBeingDefined()) { 9019 assert(Tag->isInvalidDecl() && "We should already have completed it"); 9020 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 9021 RD->completeDefinition(); 9022 } 9023 9024 if (isa<CXXRecordDecl>(Tag)) 9025 FieldCollector->FinishClass(); 9026 9027 // Exit this scope of this tag's definition. 9028 PopDeclContext(); 9029 9030 // Notify the consumer that we've defined a tag. 9031 Consumer.HandleTagDeclDefinition(Tag); 9032} 9033 9034void Sema::ActOnObjCContainerFinishDefinition() { 9035 // Exit this scope of this interface definition. 9036 PopDeclContext(); 9037} 9038 9039void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 9040 assert(DC == CurContext && "Mismatch of container contexts"); 9041 OriginalLexicalContext = DC; 9042 ActOnObjCContainerFinishDefinition(); 9043} 9044 9045void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 9046 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 9047 OriginalLexicalContext = 0; 9048} 9049 9050void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 9051 AdjustDeclIfTemplate(TagD); 9052 TagDecl *Tag = cast<TagDecl>(TagD); 9053 Tag->setInvalidDecl(); 9054 9055 // Make sure we "complete" the definition even it is invalid. 9056 if (Tag->isBeingDefined()) { 9057 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 9058 RD->completeDefinition(); 9059 } 9060 9061 // We're undoing ActOnTagStartDefinition here, not 9062 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 9063 // the FieldCollector. 9064 9065 PopDeclContext(); 9066} 9067 9068// Note that FieldName may be null for anonymous bitfields. 9069ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 9070 IdentifierInfo *FieldName, 9071 QualType FieldTy, Expr *BitWidth, 9072 bool *ZeroWidth) { 9073 // Default to true; that shouldn't confuse checks for emptiness 9074 if (ZeroWidth) 9075 *ZeroWidth = true; 9076 9077 // C99 6.7.2.1p4 - verify the field type. 9078 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 9079 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 9080 // Handle incomplete types with specific error. 9081 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 9082 return ExprError(); 9083 if (FieldName) 9084 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 9085 << FieldName << FieldTy << BitWidth->getSourceRange(); 9086 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 9087 << FieldTy << BitWidth->getSourceRange(); 9088 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 9089 UPPC_BitFieldWidth)) 9090 return ExprError(); 9091 9092 // If the bit-width is type- or value-dependent, don't try to check 9093 // it now. 9094 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 9095 return Owned(BitWidth); 9096 9097 llvm::APSInt Value; 9098 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 9099 if (ICE.isInvalid()) 9100 return ICE; 9101 BitWidth = ICE.take(); 9102 9103 if (Value != 0 && ZeroWidth) 9104 *ZeroWidth = false; 9105 9106 // Zero-width bitfield is ok for anonymous field. 9107 if (Value == 0 && FieldName) 9108 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 9109 9110 if (Value.isSigned() && Value.isNegative()) { 9111 if (FieldName) 9112 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 9113 << FieldName << Value.toString(10); 9114 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 9115 << Value.toString(10); 9116 } 9117 9118 if (!FieldTy->isDependentType()) { 9119 uint64_t TypeSize = Context.getTypeSize(FieldTy); 9120 if (Value.getZExtValue() > TypeSize) { 9121 if (!getLangOpts().CPlusPlus) { 9122 if (FieldName) 9123 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 9124 << FieldName << (unsigned)Value.getZExtValue() 9125 << (unsigned)TypeSize; 9126 9127 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 9128 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 9129 } 9130 9131 if (FieldName) 9132 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 9133 << FieldName << (unsigned)Value.getZExtValue() 9134 << (unsigned)TypeSize; 9135 else 9136 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 9137 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 9138 } 9139 } 9140 9141 return Owned(BitWidth); 9142} 9143 9144/// ActOnField - Each field of a C struct/union is passed into this in order 9145/// to create a FieldDecl object for it. 9146Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 9147 Declarator &D, Expr *BitfieldWidth) { 9148 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 9149 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 9150 /*InitStyle=*/ICIS_NoInit, AS_public); 9151 return Res; 9152} 9153 9154/// HandleField - Analyze a field of a C struct or a C++ data member. 9155/// 9156FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 9157 SourceLocation DeclStart, 9158 Declarator &D, Expr *BitWidth, 9159 InClassInitStyle InitStyle, 9160 AccessSpecifier AS) { 9161 IdentifierInfo *II = D.getIdentifier(); 9162 SourceLocation Loc = DeclStart; 9163 if (II) Loc = D.getIdentifierLoc(); 9164 9165 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9166 QualType T = TInfo->getType(); 9167 if (getLangOpts().CPlusPlus) { 9168 CheckExtraCXXDefaultArguments(D); 9169 9170 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9171 UPPC_DataMemberType)) { 9172 D.setInvalidType(); 9173 T = Context.IntTy; 9174 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 9175 } 9176 } 9177 9178 DiagnoseFunctionSpecifiers(D); 9179 9180 if (D.getDeclSpec().isThreadSpecified()) 9181 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 9182 if (D.getDeclSpec().isConstexprSpecified()) 9183 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 9184 << 2; 9185 9186 // Check to see if this name was declared as a member previously 9187 NamedDecl *PrevDecl = 0; 9188 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 9189 LookupName(Previous, S); 9190 switch (Previous.getResultKind()) { 9191 case LookupResult::Found: 9192 case LookupResult::FoundUnresolvedValue: 9193 PrevDecl = Previous.getAsSingle<NamedDecl>(); 9194 break; 9195 9196 case LookupResult::FoundOverloaded: 9197 PrevDecl = Previous.getRepresentativeDecl(); 9198 break; 9199 9200 case LookupResult::NotFound: 9201 case LookupResult::NotFoundInCurrentInstantiation: 9202 case LookupResult::Ambiguous: 9203 break; 9204 } 9205 Previous.suppressDiagnostics(); 9206 9207 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9208 // Maybe we will complain about the shadowed template parameter. 9209 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9210 // Just pretend that we didn't see the previous declaration. 9211 PrevDecl = 0; 9212 } 9213 9214 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 9215 PrevDecl = 0; 9216 9217 bool Mutable 9218 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 9219 SourceLocation TSSL = D.getLocStart(); 9220 FieldDecl *NewFD 9221 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, InitStyle, 9222 TSSL, AS, PrevDecl, &D); 9223 9224 if (NewFD->isInvalidDecl()) 9225 Record->setInvalidDecl(); 9226 9227 if (D.getDeclSpec().isModulePrivateSpecified()) 9228 NewFD->setModulePrivate(); 9229 9230 if (NewFD->isInvalidDecl() && PrevDecl) { 9231 // Don't introduce NewFD into scope; there's already something 9232 // with the same name in the same scope. 9233 } else if (II) { 9234 PushOnScopeChains(NewFD, S); 9235 } else 9236 Record->addDecl(NewFD); 9237 9238 return NewFD; 9239} 9240 9241/// \brief Build a new FieldDecl and check its well-formedness. 9242/// 9243/// This routine builds a new FieldDecl given the fields name, type, 9244/// record, etc. \p PrevDecl should refer to any previous declaration 9245/// with the same name and in the same scope as the field to be 9246/// created. 9247/// 9248/// \returns a new FieldDecl. 9249/// 9250/// \todo The Declarator argument is a hack. It will be removed once 9251FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 9252 TypeSourceInfo *TInfo, 9253 RecordDecl *Record, SourceLocation Loc, 9254 bool Mutable, Expr *BitWidth, 9255 InClassInitStyle InitStyle, 9256 SourceLocation TSSL, 9257 AccessSpecifier AS, NamedDecl *PrevDecl, 9258 Declarator *D) { 9259 IdentifierInfo *II = Name.getAsIdentifierInfo(); 9260 bool InvalidDecl = false; 9261 if (D) InvalidDecl = D->isInvalidType(); 9262 9263 // If we receive a broken type, recover by assuming 'int' and 9264 // marking this declaration as invalid. 9265 if (T.isNull()) { 9266 InvalidDecl = true; 9267 T = Context.IntTy; 9268 } 9269 9270 QualType EltTy = Context.getBaseElementType(T); 9271 if (!EltTy->isDependentType()) { 9272 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 9273 // Fields of incomplete type force their record to be invalid. 9274 Record->setInvalidDecl(); 9275 InvalidDecl = true; 9276 } else { 9277 NamedDecl *Def; 9278 EltTy->isIncompleteType(&Def); 9279 if (Def && Def->isInvalidDecl()) { 9280 Record->setInvalidDecl(); 9281 InvalidDecl = true; 9282 } 9283 } 9284 } 9285 9286 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9287 // than a variably modified type. 9288 if (!InvalidDecl && T->isVariablyModifiedType()) { 9289 bool SizeIsNegative; 9290 llvm::APSInt Oversized; 9291 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 9292 SizeIsNegative, 9293 Oversized); 9294 if (!FixedTy.isNull()) { 9295 Diag(Loc, diag::warn_illegal_constant_array_size); 9296 T = FixedTy; 9297 } else { 9298 if (SizeIsNegative) 9299 Diag(Loc, diag::err_typecheck_negative_array_size); 9300 else if (Oversized.getBoolValue()) 9301 Diag(Loc, diag::err_array_too_large) 9302 << Oversized.toString(10); 9303 else 9304 Diag(Loc, diag::err_typecheck_field_variable_size); 9305 InvalidDecl = true; 9306 } 9307 } 9308 9309 // Fields can not have abstract class types 9310 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 9311 diag::err_abstract_type_in_decl, 9312 AbstractFieldType)) 9313 InvalidDecl = true; 9314 9315 bool ZeroWidth = false; 9316 // If this is declared as a bit-field, check the bit-field. 9317 if (!InvalidDecl && BitWidth) { 9318 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 9319 if (!BitWidth) { 9320 InvalidDecl = true; 9321 BitWidth = 0; 9322 ZeroWidth = false; 9323 } 9324 } 9325 9326 // Check that 'mutable' is consistent with the type of the declaration. 9327 if (!InvalidDecl && Mutable) { 9328 unsigned DiagID = 0; 9329 if (T->isReferenceType()) 9330 DiagID = diag::err_mutable_reference; 9331 else if (T.isConstQualified()) 9332 DiagID = diag::err_mutable_const; 9333 9334 if (DiagID) { 9335 SourceLocation ErrLoc = Loc; 9336 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 9337 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 9338 Diag(ErrLoc, DiagID); 9339 Mutable = false; 9340 InvalidDecl = true; 9341 } 9342 } 9343 9344 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 9345 BitWidth, Mutable, InitStyle); 9346 if (InvalidDecl) 9347 NewFD->setInvalidDecl(); 9348 9349 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 9350 Diag(Loc, diag::err_duplicate_member) << II; 9351 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9352 NewFD->setInvalidDecl(); 9353 } 9354 9355 if (!InvalidDecl && getLangOpts().CPlusPlus) { 9356 if (Record->isUnion()) { 9357 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9358 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9359 if (RDecl->getDefinition()) { 9360 // C++ [class.union]p1: An object of a class with a non-trivial 9361 // constructor, a non-trivial copy constructor, a non-trivial 9362 // destructor, or a non-trivial copy assignment operator 9363 // cannot be a member of a union, nor can an array of such 9364 // objects. 9365 if (CheckNontrivialField(NewFD)) 9366 NewFD->setInvalidDecl(); 9367 } 9368 } 9369 9370 // C++ [class.union]p1: If a union contains a member of reference type, 9371 // the program is ill-formed. 9372 if (EltTy->isReferenceType()) { 9373 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 9374 << NewFD->getDeclName() << EltTy; 9375 NewFD->setInvalidDecl(); 9376 } 9377 } 9378 } 9379 9380 // FIXME: We need to pass in the attributes given an AST 9381 // representation, not a parser representation. 9382 if (D) 9383 // FIXME: What to pass instead of TUScope? 9384 ProcessDeclAttributes(TUScope, NewFD, *D); 9385 9386 // In auto-retain/release, infer strong retension for fields of 9387 // retainable type. 9388 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 9389 NewFD->setInvalidDecl(); 9390 9391 if (T.isObjCGCWeak()) 9392 Diag(Loc, diag::warn_attribute_weak_on_field); 9393 9394 NewFD->setAccess(AS); 9395 return NewFD; 9396} 9397 9398bool Sema::CheckNontrivialField(FieldDecl *FD) { 9399 assert(FD); 9400 assert(getLangOpts().CPlusPlus && "valid check only for C++"); 9401 9402 if (FD->isInvalidDecl()) 9403 return true; 9404 9405 QualType EltTy = Context.getBaseElementType(FD->getType()); 9406 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9407 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9408 if (RDecl->getDefinition()) { 9409 // We check for copy constructors before constructors 9410 // because otherwise we'll never get complaints about 9411 // copy constructors. 9412 9413 CXXSpecialMember member = CXXInvalid; 9414 if (!RDecl->hasTrivialCopyConstructor()) 9415 member = CXXCopyConstructor; 9416 else if (!RDecl->hasTrivialDefaultConstructor()) 9417 member = CXXDefaultConstructor; 9418 else if (!RDecl->hasTrivialCopyAssignment()) 9419 member = CXXCopyAssignment; 9420 else if (!RDecl->hasTrivialDestructor()) 9421 member = CXXDestructor; 9422 9423 if (member != CXXInvalid) { 9424 if (!getLangOpts().CPlusPlus0x && 9425 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) { 9426 // Objective-C++ ARC: it is an error to have a non-trivial field of 9427 // a union. However, system headers in Objective-C programs 9428 // occasionally have Objective-C lifetime objects within unions, 9429 // and rather than cause the program to fail, we make those 9430 // members unavailable. 9431 SourceLocation Loc = FD->getLocation(); 9432 if (getSourceManager().isInSystemHeader(Loc)) { 9433 if (!FD->hasAttr<UnavailableAttr>()) 9434 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 9435 "this system field has retaining ownership")); 9436 return false; 9437 } 9438 } 9439 9440 Diag(FD->getLocation(), getLangOpts().CPlusPlus0x ? 9441 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 9442 diag::err_illegal_union_or_anon_struct_member) 9443 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 9444 DiagnoseNontrivial(RT, member); 9445 return !getLangOpts().CPlusPlus0x; 9446 } 9447 } 9448 } 9449 9450 return false; 9451} 9452 9453/// If the given constructor is user-provided, produce a diagnostic explaining 9454/// that it makes the class non-trivial. 9455static bool DiagnoseNontrivialUserProvidedCtor(Sema &S, QualType QT, 9456 CXXConstructorDecl *CD, 9457 Sema::CXXSpecialMember CSM) { 9458 if (!CD->isUserProvided()) 9459 return false; 9460 9461 SourceLocation CtorLoc = CD->getLocation(); 9462 S.Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << CSM; 9463 return true; 9464} 9465 9466/// DiagnoseNontrivial - Given that a class has a non-trivial 9467/// special member, figure out why. 9468void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 9469 QualType QT(T, 0U); 9470 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 9471 9472 // Check whether the member was user-declared. 9473 switch (member) { 9474 case CXXInvalid: 9475 break; 9476 9477 case CXXDefaultConstructor: 9478 if (RD->hasUserDeclaredConstructor()) { 9479 typedef CXXRecordDecl::ctor_iterator ctor_iter; 9480 for (ctor_iter CI = RD->ctor_begin(), CE = RD->ctor_end(); CI != CE; ++CI) 9481 if (DiagnoseNontrivialUserProvidedCtor(*this, QT, *CI, member)) 9482 return; 9483 9484 // No user-provided constructors; look for constructor templates. 9485 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 9486 tmpl_iter; 9487 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); 9488 TI != TE; ++TI) { 9489 CXXConstructorDecl *CD = 9490 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()); 9491 if (CD && DiagnoseNontrivialUserProvidedCtor(*this, QT, CD, member)) 9492 return; 9493 } 9494 } 9495 break; 9496 9497 case CXXCopyConstructor: 9498 if (RD->hasUserDeclaredCopyConstructor()) { 9499 SourceLocation CtorLoc = 9500 RD->getCopyConstructor(0)->getLocation(); 9501 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9502 return; 9503 } 9504 break; 9505 9506 case CXXMoveConstructor: 9507 if (RD->hasUserDeclaredMoveConstructor()) { 9508 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 9509 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9510 return; 9511 } 9512 break; 9513 9514 case CXXCopyAssignment: 9515 if (RD->hasUserDeclaredCopyAssignment()) { 9516 SourceLocation AssignLoc = 9517 RD->getCopyAssignmentOperator(0)->getLocation(); 9518 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9519 return; 9520 } 9521 break; 9522 9523 case CXXMoveAssignment: 9524 if (RD->hasUserDeclaredMoveAssignment()) { 9525 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 9526 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9527 return; 9528 } 9529 break; 9530 9531 case CXXDestructor: 9532 if (RD->hasUserDeclaredDestructor()) { 9533 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 9534 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9535 return; 9536 } 9537 break; 9538 } 9539 9540 typedef CXXRecordDecl::base_class_iterator base_iter; 9541 9542 // Virtual bases and members inhibit trivial copying/construction, 9543 // but not trivial destruction. 9544 if (member != CXXDestructor) { 9545 // Check for virtual bases. vbases includes indirect virtual bases, 9546 // so we just iterate through the direct bases. 9547 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 9548 if (bi->isVirtual()) { 9549 SourceLocation BaseLoc = bi->getLocStart(); 9550 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 9551 return; 9552 } 9553 9554 // Check for virtual methods. 9555 typedef CXXRecordDecl::method_iterator meth_iter; 9556 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 9557 ++mi) { 9558 if (mi->isVirtual()) { 9559 SourceLocation MLoc = mi->getLocStart(); 9560 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 9561 return; 9562 } 9563 } 9564 } 9565 9566 bool (CXXRecordDecl::*hasTrivial)() const; 9567 switch (member) { 9568 case CXXDefaultConstructor: 9569 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 9570 case CXXCopyConstructor: 9571 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 9572 case CXXCopyAssignment: 9573 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 9574 case CXXDestructor: 9575 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 9576 default: 9577 llvm_unreachable("unexpected special member"); 9578 } 9579 9580 // Check for nontrivial bases (and recurse). 9581 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 9582 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 9583 assert(BaseRT && "Don't know how to handle dependent bases"); 9584 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 9585 if (!(BaseRecTy->*hasTrivial)()) { 9586 SourceLocation BaseLoc = bi->getLocStart(); 9587 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 9588 DiagnoseNontrivial(BaseRT, member); 9589 return; 9590 } 9591 } 9592 9593 // Check for nontrivial members (and recurse). 9594 typedef RecordDecl::field_iterator field_iter; 9595 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 9596 ++fi) { 9597 QualType EltTy = Context.getBaseElementType(fi->getType()); 9598 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 9599 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 9600 9601 if (!(EltRD->*hasTrivial)()) { 9602 SourceLocation FLoc = fi->getLocation(); 9603 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 9604 DiagnoseNontrivial(EltRT, member); 9605 return; 9606 } 9607 } 9608 9609 if (EltTy->isObjCLifetimeType()) { 9610 switch (EltTy.getObjCLifetime()) { 9611 case Qualifiers::OCL_None: 9612 case Qualifiers::OCL_ExplicitNone: 9613 break; 9614 9615 case Qualifiers::OCL_Autoreleasing: 9616 case Qualifiers::OCL_Weak: 9617 case Qualifiers::OCL_Strong: 9618 Diag(fi->getLocation(), diag::note_nontrivial_objc_ownership) 9619 << QT << EltTy.getObjCLifetime(); 9620 return; 9621 } 9622 } 9623 } 9624 9625 llvm_unreachable("found no explanation for non-trivial member"); 9626} 9627 9628/// TranslateIvarVisibility - Translate visibility from a token ID to an 9629/// AST enum value. 9630static ObjCIvarDecl::AccessControl 9631TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9632 switch (ivarVisibility) { 9633 default: llvm_unreachable("Unknown visitibility kind"); 9634 case tok::objc_private: return ObjCIvarDecl::Private; 9635 case tok::objc_public: return ObjCIvarDecl::Public; 9636 case tok::objc_protected: return ObjCIvarDecl::Protected; 9637 case tok::objc_package: return ObjCIvarDecl::Package; 9638 } 9639} 9640 9641/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9642/// in order to create an IvarDecl object for it. 9643Decl *Sema::ActOnIvar(Scope *S, 9644 SourceLocation DeclStart, 9645 Declarator &D, Expr *BitfieldWidth, 9646 tok::ObjCKeywordKind Visibility) { 9647 9648 IdentifierInfo *II = D.getIdentifier(); 9649 Expr *BitWidth = (Expr*)BitfieldWidth; 9650 SourceLocation Loc = DeclStart; 9651 if (II) Loc = D.getIdentifierLoc(); 9652 9653 // FIXME: Unnamed fields can be handled in various different ways, for 9654 // example, unnamed unions inject all members into the struct namespace! 9655 9656 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9657 QualType T = TInfo->getType(); 9658 9659 if (BitWidth) { 9660 // 6.7.2.1p3, 6.7.2.1p4 9661 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9662 if (!BitWidth) 9663 D.setInvalidType(); 9664 } else { 9665 // Not a bitfield. 9666 9667 // validate II. 9668 9669 } 9670 if (T->isReferenceType()) { 9671 Diag(Loc, diag::err_ivar_reference_type); 9672 D.setInvalidType(); 9673 } 9674 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9675 // than a variably modified type. 9676 else if (T->isVariablyModifiedType()) { 9677 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9678 D.setInvalidType(); 9679 } 9680 9681 // Get the visibility (access control) for this ivar. 9682 ObjCIvarDecl::AccessControl ac = 9683 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9684 : ObjCIvarDecl::None; 9685 // Must set ivar's DeclContext to its enclosing interface. 9686 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9687 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9688 return 0; 9689 ObjCContainerDecl *EnclosingContext; 9690 if (ObjCImplementationDecl *IMPDecl = 9691 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9692 if (LangOpts.ObjCRuntime.isFragile()) { 9693 // Case of ivar declared in an implementation. Context is that of its class. 9694 EnclosingContext = IMPDecl->getClassInterface(); 9695 assert(EnclosingContext && "Implementation has no class interface!"); 9696 } 9697 else 9698 EnclosingContext = EnclosingDecl; 9699 } else { 9700 if (ObjCCategoryDecl *CDecl = 9701 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9702 if (LangOpts.ObjCRuntime.isFragile() || !CDecl->IsClassExtension()) { 9703 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9704 return 0; 9705 } 9706 } 9707 EnclosingContext = EnclosingDecl; 9708 } 9709 9710 // Construct the decl. 9711 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9712 DeclStart, Loc, II, T, 9713 TInfo, ac, (Expr *)BitfieldWidth); 9714 9715 if (II) { 9716 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9717 ForRedeclaration); 9718 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9719 && !isa<TagDecl>(PrevDecl)) { 9720 Diag(Loc, diag::err_duplicate_member) << II; 9721 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9722 NewID->setInvalidDecl(); 9723 } 9724 } 9725 9726 // Process attributes attached to the ivar. 9727 ProcessDeclAttributes(S, NewID, D); 9728 9729 if (D.isInvalidType()) 9730 NewID->setInvalidDecl(); 9731 9732 // In ARC, infer 'retaining' for ivars of retainable type. 9733 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9734 NewID->setInvalidDecl(); 9735 9736 if (D.getDeclSpec().isModulePrivateSpecified()) 9737 NewID->setModulePrivate(); 9738 9739 if (II) { 9740 // FIXME: When interfaces are DeclContexts, we'll need to add 9741 // these to the interface. 9742 S->AddDecl(NewID); 9743 IdResolver.AddDecl(NewID); 9744 } 9745 9746 if (LangOpts.ObjCRuntime.isNonFragile() && 9747 !NewID->isInvalidDecl() && isa<ObjCInterfaceDecl>(EnclosingDecl)) 9748 Diag(Loc, diag::warn_ivars_in_interface); 9749 9750 return NewID; 9751} 9752 9753/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9754/// class and class extensions. For every class @interface and class 9755/// extension @interface, if the last ivar is a bitfield of any type, 9756/// then add an implicit `char :0` ivar to the end of that interface. 9757void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9758 SmallVectorImpl<Decl *> &AllIvarDecls) { 9759 if (LangOpts.ObjCRuntime.isFragile() || AllIvarDecls.empty()) 9760 return; 9761 9762 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9763 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9764 9765 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9766 return; 9767 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9768 if (!ID) { 9769 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9770 if (!CD->IsClassExtension()) 9771 return; 9772 } 9773 // No need to add this to end of @implementation. 9774 else 9775 return; 9776 } 9777 // All conditions are met. Add a new bitfield to the tail end of ivars. 9778 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9779 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9780 9781 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9782 DeclLoc, DeclLoc, 0, 9783 Context.CharTy, 9784 Context.getTrivialTypeSourceInfo(Context.CharTy, 9785 DeclLoc), 9786 ObjCIvarDecl::Private, BW, 9787 true); 9788 AllIvarDecls.push_back(Ivar); 9789} 9790 9791void Sema::ActOnFields(Scope* S, 9792 SourceLocation RecLoc, Decl *EnclosingDecl, 9793 llvm::ArrayRef<Decl *> Fields, 9794 SourceLocation LBrac, SourceLocation RBrac, 9795 AttributeList *Attr) { 9796 assert(EnclosingDecl && "missing record or interface decl"); 9797 9798 // If the decl this is being inserted into is invalid, then it may be a 9799 // redeclaration or some other bogus case. Don't try to add fields to it. 9800 if (EnclosingDecl->isInvalidDecl()) 9801 return; 9802 9803 // If this is an Objective-C @implementation or category and we have 9804 // new fields here we should reset the layout of the interface since 9805 // it will now change. 9806 if (!Fields.empty() && isa<ObjCContainerDecl>(EnclosingDecl)) { 9807 ObjCContainerDecl *DC = cast<ObjCContainerDecl>(EnclosingDecl); 9808 switch (DC->getKind()) { 9809 default: break; 9810 case Decl::ObjCCategory: 9811 Context.ResetObjCLayout(cast<ObjCCategoryDecl>(DC)->getClassInterface()); 9812 break; 9813 case Decl::ObjCImplementation: 9814 Context. 9815 ResetObjCLayout(cast<ObjCImplementationDecl>(DC)->getClassInterface()); 9816 break; 9817 } 9818 } 9819 9820 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9821 9822 // Start counting up the number of named members; make sure to include 9823 // members of anonymous structs and unions in the total. 9824 unsigned NumNamedMembers = 0; 9825 if (Record) { 9826 for (RecordDecl::decl_iterator i = Record->decls_begin(), 9827 e = Record->decls_end(); i != e; i++) { 9828 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i)) 9829 if (IFD->getDeclName()) 9830 ++NumNamedMembers; 9831 } 9832 } 9833 9834 // Verify that all the fields are okay. 9835 SmallVector<FieldDecl*, 32> RecFields; 9836 9837 bool ARCErrReported = false; 9838 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9839 i != end; ++i) { 9840 FieldDecl *FD = cast<FieldDecl>(*i); 9841 9842 // Get the type for the field. 9843 const Type *FDTy = FD->getType().getTypePtr(); 9844 9845 if (!FD->isAnonymousStructOrUnion()) { 9846 // Remember all fields written by the user. 9847 RecFields.push_back(FD); 9848 } 9849 9850 // If the field is already invalid for some reason, don't emit more 9851 // diagnostics about it. 9852 if (FD->isInvalidDecl()) { 9853 EnclosingDecl->setInvalidDecl(); 9854 continue; 9855 } 9856 9857 // C99 6.7.2.1p2: 9858 // A structure or union shall not contain a member with 9859 // incomplete or function type (hence, a structure shall not 9860 // contain an instance of itself, but may contain a pointer to 9861 // an instance of itself), except that the last member of a 9862 // structure with more than one named member may have incomplete 9863 // array type; such a structure (and any union containing, 9864 // possibly recursively, a member that is such a structure) 9865 // shall not be a member of a structure or an element of an 9866 // array. 9867 if (FDTy->isFunctionType()) { 9868 // Field declared as a function. 9869 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9870 << FD->getDeclName(); 9871 FD->setInvalidDecl(); 9872 EnclosingDecl->setInvalidDecl(); 9873 continue; 9874 } else if (FDTy->isIncompleteArrayType() && Record && 9875 ((i + 1 == Fields.end() && !Record->isUnion()) || 9876 ((getLangOpts().MicrosoftExt || 9877 getLangOpts().CPlusPlus) && 9878 (i + 1 == Fields.end() || Record->isUnion())))) { 9879 // Flexible array member. 9880 // Microsoft and g++ is more permissive regarding flexible array. 9881 // It will accept flexible array in union and also 9882 // as the sole element of a struct/class. 9883 if (getLangOpts().MicrosoftExt) { 9884 if (Record->isUnion()) 9885 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9886 << FD->getDeclName(); 9887 else if (Fields.size() == 1) 9888 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9889 << FD->getDeclName() << Record->getTagKind(); 9890 } else if (getLangOpts().CPlusPlus) { 9891 if (Record->isUnion()) 9892 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9893 << FD->getDeclName(); 9894 else if (Fields.size() == 1) 9895 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9896 << FD->getDeclName() << Record->getTagKind(); 9897 } else if (!getLangOpts().C99) { 9898 if (Record->isUnion()) 9899 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9900 << FD->getDeclName(); 9901 else 9902 Diag(FD->getLocation(), diag::ext_c99_flexible_array_member) 9903 << FD->getDeclName() << Record->getTagKind(); 9904 } else if (NumNamedMembers < 1) { 9905 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9906 << FD->getDeclName(); 9907 FD->setInvalidDecl(); 9908 EnclosingDecl->setInvalidDecl(); 9909 continue; 9910 } 9911 if (!FD->getType()->isDependentType() && 9912 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9913 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9914 << FD->getDeclName() << FD->getType(); 9915 FD->setInvalidDecl(); 9916 EnclosingDecl->setInvalidDecl(); 9917 continue; 9918 } 9919 // Okay, we have a legal flexible array member at the end of the struct. 9920 if (Record) 9921 Record->setHasFlexibleArrayMember(true); 9922 } else if (!FDTy->isDependentType() && 9923 RequireCompleteType(FD->getLocation(), FD->getType(), 9924 diag::err_field_incomplete)) { 9925 // Incomplete type 9926 FD->setInvalidDecl(); 9927 EnclosingDecl->setInvalidDecl(); 9928 continue; 9929 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9930 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9931 // If this is a member of a union, then entire union becomes "flexible". 9932 if (Record && Record->isUnion()) { 9933 Record->setHasFlexibleArrayMember(true); 9934 } else { 9935 // If this is a struct/class and this is not the last element, reject 9936 // it. Note that GCC supports variable sized arrays in the middle of 9937 // structures. 9938 if (i + 1 != Fields.end()) 9939 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9940 << FD->getDeclName() << FD->getType(); 9941 else { 9942 // We support flexible arrays at the end of structs in 9943 // other structs as an extension. 9944 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9945 << FD->getDeclName(); 9946 if (Record) 9947 Record->setHasFlexibleArrayMember(true); 9948 } 9949 } 9950 } 9951 if (Record && FDTTy->getDecl()->hasObjectMember()) 9952 Record->setHasObjectMember(true); 9953 } else if (FDTy->isObjCObjectType()) { 9954 /// A field cannot be an Objective-c object 9955 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9956 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9957 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9958 FD->setType(T); 9959 } 9960 else if (!getLangOpts().CPlusPlus) { 9961 if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported) { 9962 // It's an error in ARC if a field has lifetime. 9963 // We don't want to report this in a system header, though, 9964 // so we just make the field unavailable. 9965 // FIXME: that's really not sufficient; we need to make the type 9966 // itself invalid to, say, initialize or copy. 9967 QualType T = FD->getType(); 9968 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9969 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9970 SourceLocation loc = FD->getLocation(); 9971 if (getSourceManager().isInSystemHeader(loc)) { 9972 if (!FD->hasAttr<UnavailableAttr>()) { 9973 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9974 "this system field has retaining ownership")); 9975 } 9976 } else { 9977 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9978 << T->isBlockPointerType(); 9979 } 9980 ARCErrReported = true; 9981 } 9982 } 9983 else if (getLangOpts().ObjC1 && 9984 getLangOpts().getGC() != LangOptions::NonGC && 9985 Record && !Record->hasObjectMember()) { 9986 if (FD->getType()->isObjCObjectPointerType() || 9987 FD->getType().isObjCGCStrong()) 9988 Record->setHasObjectMember(true); 9989 else if (Context.getAsArrayType(FD->getType())) { 9990 QualType BaseType = Context.getBaseElementType(FD->getType()); 9991 if (BaseType->isRecordType() && 9992 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9993 Record->setHasObjectMember(true); 9994 else if (BaseType->isObjCObjectPointerType() || 9995 BaseType.isObjCGCStrong()) 9996 Record->setHasObjectMember(true); 9997 } 9998 } 9999 } 10000 // Keep track of the number of named members. 10001 if (FD->getIdentifier()) 10002 ++NumNamedMembers; 10003 } 10004 10005 // Okay, we successfully defined 'Record'. 10006 if (Record) { 10007 bool Completed = false; 10008 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 10009 if (!CXXRecord->isInvalidDecl()) { 10010 // Set access bits correctly on the directly-declared conversions. 10011 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 10012 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 10013 I != E; ++I) 10014 Convs->setAccess(I, (*I)->getAccess()); 10015 10016 if (!CXXRecord->isDependentType()) { 10017 // Objective-C Automatic Reference Counting: 10018 // If a class has a non-static data member of Objective-C pointer 10019 // type (or array thereof), it is a non-POD type and its 10020 // default constructor (if any), copy constructor, copy assignment 10021 // operator, and destructor are non-trivial. 10022 // 10023 // This rule is also handled by CXXRecordDecl::completeDefinition(). 10024 // However, here we check whether this particular class is only 10025 // non-POD because of the presence of an Objective-C pointer member. 10026 // If so, objects of this type cannot be shared between code compiled 10027 // with ARC and code compiled with manual retain/release. 10028 if (getLangOpts().ObjCAutoRefCount && 10029 CXXRecord->hasObjectMember() && 10030 CXXRecord->getLinkage() == ExternalLinkage) { 10031 if (CXXRecord->isPOD()) { 10032 Diag(CXXRecord->getLocation(), 10033 diag::warn_arc_non_pod_class_with_object_member) 10034 << CXXRecord; 10035 } else { 10036 // FIXME: Fix-Its would be nice here, but finding a good location 10037 // for them is going to be tricky. 10038 if (CXXRecord->hasTrivialCopyConstructor()) 10039 Diag(CXXRecord->getLocation(), 10040 diag::warn_arc_trivial_member_function_with_object_member) 10041 << CXXRecord << 0; 10042 if (CXXRecord->hasTrivialCopyAssignment()) 10043 Diag(CXXRecord->getLocation(), 10044 diag::warn_arc_trivial_member_function_with_object_member) 10045 << CXXRecord << 1; 10046 if (CXXRecord->hasTrivialDestructor()) 10047 Diag(CXXRecord->getLocation(), 10048 diag::warn_arc_trivial_member_function_with_object_member) 10049 << CXXRecord << 2; 10050 } 10051 } 10052 10053 // Adjust user-defined destructor exception spec. 10054 if (getLangOpts().CPlusPlus0x && 10055 CXXRecord->hasUserDeclaredDestructor()) 10056 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 10057 10058 // Add any implicitly-declared members to this class. 10059 AddImplicitlyDeclaredMembersToClass(CXXRecord); 10060 10061 // If we have virtual base classes, we may end up finding multiple 10062 // final overriders for a given virtual function. Check for this 10063 // problem now. 10064 if (CXXRecord->getNumVBases()) { 10065 CXXFinalOverriderMap FinalOverriders; 10066 CXXRecord->getFinalOverriders(FinalOverriders); 10067 10068 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 10069 MEnd = FinalOverriders.end(); 10070 M != MEnd; ++M) { 10071 for (OverridingMethods::iterator SO = M->second.begin(), 10072 SOEnd = M->second.end(); 10073 SO != SOEnd; ++SO) { 10074 assert(SO->second.size() > 0 && 10075 "Virtual function without overridding functions?"); 10076 if (SO->second.size() == 1) 10077 continue; 10078 10079 // C++ [class.virtual]p2: 10080 // In a derived class, if a virtual member function of a base 10081 // class subobject has more than one final overrider the 10082 // program is ill-formed. 10083 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 10084 << (NamedDecl *)M->first << Record; 10085 Diag(M->first->getLocation(), 10086 diag::note_overridden_virtual_function); 10087 for (OverridingMethods::overriding_iterator 10088 OM = SO->second.begin(), 10089 OMEnd = SO->second.end(); 10090 OM != OMEnd; ++OM) 10091 Diag(OM->Method->getLocation(), diag::note_final_overrider) 10092 << (NamedDecl *)M->first << OM->Method->getParent(); 10093 10094 Record->setInvalidDecl(); 10095 } 10096 } 10097 CXXRecord->completeDefinition(&FinalOverriders); 10098 Completed = true; 10099 } 10100 } 10101 } 10102 } 10103 10104 if (!Completed) 10105 Record->completeDefinition(); 10106 10107 } else { 10108 ObjCIvarDecl **ClsFields = 10109 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 10110 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 10111 ID->setEndOfDefinitionLoc(RBrac); 10112 // Add ivar's to class's DeclContext. 10113 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 10114 ClsFields[i]->setLexicalDeclContext(ID); 10115 ID->addDecl(ClsFields[i]); 10116 } 10117 // Must enforce the rule that ivars in the base classes may not be 10118 // duplicates. 10119 if (ID->getSuperClass()) 10120 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 10121 } else if (ObjCImplementationDecl *IMPDecl = 10122 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 10123 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 10124 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 10125 // Ivar declared in @implementation never belongs to the implementation. 10126 // Only it is in implementation's lexical context. 10127 ClsFields[I]->setLexicalDeclContext(IMPDecl); 10128 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 10129 IMPDecl->setIvarLBraceLoc(LBrac); 10130 IMPDecl->setIvarRBraceLoc(RBrac); 10131 } else if (ObjCCategoryDecl *CDecl = 10132 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 10133 // case of ivars in class extension; all other cases have been 10134 // reported as errors elsewhere. 10135 // FIXME. Class extension does not have a LocEnd field. 10136 // CDecl->setLocEnd(RBrac); 10137 // Add ivar's to class extension's DeclContext. 10138 // Diagnose redeclaration of private ivars. 10139 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 10140 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 10141 if (IDecl) { 10142 if (const ObjCIvarDecl *ClsIvar = 10143 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 10144 Diag(ClsFields[i]->getLocation(), 10145 diag::err_duplicate_ivar_declaration); 10146 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 10147 continue; 10148 } 10149 for (const ObjCCategoryDecl *ClsExtDecl = 10150 IDecl->getFirstClassExtension(); 10151 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 10152 if (const ObjCIvarDecl *ClsExtIvar = 10153 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 10154 Diag(ClsFields[i]->getLocation(), 10155 diag::err_duplicate_ivar_declaration); 10156 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 10157 continue; 10158 } 10159 } 10160 } 10161 ClsFields[i]->setLexicalDeclContext(CDecl); 10162 CDecl->addDecl(ClsFields[i]); 10163 } 10164 CDecl->setIvarLBraceLoc(LBrac); 10165 CDecl->setIvarRBraceLoc(RBrac); 10166 } 10167 } 10168 10169 if (Attr) 10170 ProcessDeclAttributeList(S, Record, Attr); 10171} 10172 10173/// \brief Determine whether the given integral value is representable within 10174/// the given type T. 10175static bool isRepresentableIntegerValue(ASTContext &Context, 10176 llvm::APSInt &Value, 10177 QualType T) { 10178 assert(T->isIntegralType(Context) && "Integral type required!"); 10179 unsigned BitWidth = Context.getIntWidth(T); 10180 10181 if (Value.isUnsigned() || Value.isNonNegative()) { 10182 if (T->isSignedIntegerOrEnumerationType()) 10183 --BitWidth; 10184 return Value.getActiveBits() <= BitWidth; 10185 } 10186 return Value.getMinSignedBits() <= BitWidth; 10187} 10188 10189// \brief Given an integral type, return the next larger integral type 10190// (or a NULL type of no such type exists). 10191static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 10192 // FIXME: Int128/UInt128 support, which also needs to be introduced into 10193 // enum checking below. 10194 assert(T->isIntegralType(Context) && "Integral type required!"); 10195 const unsigned NumTypes = 4; 10196 QualType SignedIntegralTypes[NumTypes] = { 10197 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 10198 }; 10199 QualType UnsignedIntegralTypes[NumTypes] = { 10200 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 10201 Context.UnsignedLongLongTy 10202 }; 10203 10204 unsigned BitWidth = Context.getTypeSize(T); 10205 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 10206 : UnsignedIntegralTypes; 10207 for (unsigned I = 0; I != NumTypes; ++I) 10208 if (Context.getTypeSize(Types[I]) > BitWidth) 10209 return Types[I]; 10210 10211 return QualType(); 10212} 10213 10214EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 10215 EnumConstantDecl *LastEnumConst, 10216 SourceLocation IdLoc, 10217 IdentifierInfo *Id, 10218 Expr *Val) { 10219 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10220 llvm::APSInt EnumVal(IntWidth); 10221 QualType EltTy; 10222 10223 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 10224 Val = 0; 10225 10226 if (Val) 10227 Val = DefaultLvalueConversion(Val).take(); 10228 10229 if (Val) { 10230 if (Enum->isDependentType() || Val->isTypeDependent()) 10231 EltTy = Context.DependentTy; 10232 else { 10233 SourceLocation ExpLoc; 10234 if (getLangOpts().CPlusPlus0x && Enum->isFixed() && 10235 !getLangOpts().MicrosoftMode) { 10236 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 10237 // constant-expression in the enumerator-definition shall be a converted 10238 // constant expression of the underlying type. 10239 EltTy = Enum->getIntegerType(); 10240 ExprResult Converted = 10241 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 10242 CCEK_Enumerator); 10243 if (Converted.isInvalid()) 10244 Val = 0; 10245 else 10246 Val = Converted.take(); 10247 } else if (!Val->isValueDependent() && 10248 !(Val = VerifyIntegerConstantExpression(Val, 10249 &EnumVal).take())) { 10250 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 10251 } else { 10252 if (Enum->isFixed()) { 10253 EltTy = Enum->getIntegerType(); 10254 10255 // In Obj-C and Microsoft mode, require the enumeration value to be 10256 // representable in the underlying type of the enumeration. In C++11, 10257 // we perform a non-narrowing conversion as part of converted constant 10258 // expression checking. 10259 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10260 if (getLangOpts().MicrosoftMode) { 10261 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 10262 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10263 } else 10264 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 10265 } else 10266 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10267 } else if (getLangOpts().CPlusPlus) { 10268 // C++11 [dcl.enum]p5: 10269 // If the underlying type is not fixed, the type of each enumerator 10270 // is the type of its initializing value: 10271 // - If an initializer is specified for an enumerator, the 10272 // initializing value has the same type as the expression. 10273 EltTy = Val->getType(); 10274 } else { 10275 // C99 6.7.2.2p2: 10276 // The expression that defines the value of an enumeration constant 10277 // shall be an integer constant expression that has a value 10278 // representable as an int. 10279 10280 // Complain if the value is not representable in an int. 10281 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 10282 Diag(IdLoc, diag::ext_enum_value_not_int) 10283 << EnumVal.toString(10) << Val->getSourceRange() 10284 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 10285 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 10286 // Force the type of the expression to 'int'. 10287 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 10288 } 10289 EltTy = Val->getType(); 10290 } 10291 } 10292 } 10293 } 10294 10295 if (!Val) { 10296 if (Enum->isDependentType()) 10297 EltTy = Context.DependentTy; 10298 else if (!LastEnumConst) { 10299 // C++0x [dcl.enum]p5: 10300 // If the underlying type is not fixed, the type of each enumerator 10301 // is the type of its initializing value: 10302 // - If no initializer is specified for the first enumerator, the 10303 // initializing value has an unspecified integral type. 10304 // 10305 // GCC uses 'int' for its unspecified integral type, as does 10306 // C99 6.7.2.2p3. 10307 if (Enum->isFixed()) { 10308 EltTy = Enum->getIntegerType(); 10309 } 10310 else { 10311 EltTy = Context.IntTy; 10312 } 10313 } else { 10314 // Assign the last value + 1. 10315 EnumVal = LastEnumConst->getInitVal(); 10316 ++EnumVal; 10317 EltTy = LastEnumConst->getType(); 10318 10319 // Check for overflow on increment. 10320 if (EnumVal < LastEnumConst->getInitVal()) { 10321 // C++0x [dcl.enum]p5: 10322 // If the underlying type is not fixed, the type of each enumerator 10323 // is the type of its initializing value: 10324 // 10325 // - Otherwise the type of the initializing value is the same as 10326 // the type of the initializing value of the preceding enumerator 10327 // unless the incremented value is not representable in that type, 10328 // in which case the type is an unspecified integral type 10329 // sufficient to contain the incremented value. If no such type 10330 // exists, the program is ill-formed. 10331 QualType T = getNextLargerIntegralType(Context, EltTy); 10332 if (T.isNull() || Enum->isFixed()) { 10333 // There is no integral type larger enough to represent this 10334 // value. Complain, then allow the value to wrap around. 10335 EnumVal = LastEnumConst->getInitVal(); 10336 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 10337 ++EnumVal; 10338 if (Enum->isFixed()) 10339 // When the underlying type is fixed, this is ill-formed. 10340 Diag(IdLoc, diag::err_enumerator_wrapped) 10341 << EnumVal.toString(10) 10342 << EltTy; 10343 else 10344 Diag(IdLoc, diag::warn_enumerator_too_large) 10345 << EnumVal.toString(10); 10346 } else { 10347 EltTy = T; 10348 } 10349 10350 // Retrieve the last enumerator's value, extent that type to the 10351 // type that is supposed to be large enough to represent the incremented 10352 // value, then increment. 10353 EnumVal = LastEnumConst->getInitVal(); 10354 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10355 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 10356 ++EnumVal; 10357 10358 // If we're not in C++, diagnose the overflow of enumerator values, 10359 // which in C99 means that the enumerator value is not representable in 10360 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 10361 // permits enumerator values that are representable in some larger 10362 // integral type. 10363 if (!getLangOpts().CPlusPlus && !T.isNull()) 10364 Diag(IdLoc, diag::warn_enum_value_overflow); 10365 } else if (!getLangOpts().CPlusPlus && 10366 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10367 // Enforce C99 6.7.2.2p2 even when we compute the next value. 10368 Diag(IdLoc, diag::ext_enum_value_not_int) 10369 << EnumVal.toString(10) << 1; 10370 } 10371 } 10372 } 10373 10374 if (!EltTy->isDependentType()) { 10375 // Make the enumerator value match the signedness and size of the 10376 // enumerator's type. 10377 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); 10378 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10379 } 10380 10381 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 10382 Val, EnumVal); 10383} 10384 10385 10386Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 10387 SourceLocation IdLoc, IdentifierInfo *Id, 10388 AttributeList *Attr, 10389 SourceLocation EqualLoc, Expr *Val) { 10390 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 10391 EnumConstantDecl *LastEnumConst = 10392 cast_or_null<EnumConstantDecl>(lastEnumConst); 10393 10394 // The scope passed in may not be a decl scope. Zip up the scope tree until 10395 // we find one that is. 10396 S = getNonFieldDeclScope(S); 10397 10398 // Verify that there isn't already something declared with this name in this 10399 // scope. 10400 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 10401 ForRedeclaration); 10402 if (PrevDecl && PrevDecl->isTemplateParameter()) { 10403 // Maybe we will complain about the shadowed template parameter. 10404 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 10405 // Just pretend that we didn't see the previous declaration. 10406 PrevDecl = 0; 10407 } 10408 10409 if (PrevDecl) { 10410 // When in C++, we may get a TagDecl with the same name; in this case the 10411 // enum constant will 'hide' the tag. 10412 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 10413 "Received TagDecl when not in C++!"); 10414 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 10415 if (isa<EnumConstantDecl>(PrevDecl)) 10416 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 10417 else 10418 Diag(IdLoc, diag::err_redefinition) << Id; 10419 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 10420 return 0; 10421 } 10422 } 10423 10424 // C++ [class.mem]p15: 10425 // If T is the name of a class, then each of the following shall have a name 10426 // different from T: 10427 // - every enumerator of every member of class T that is an unscoped 10428 // enumerated type 10429 if (CXXRecordDecl *Record 10430 = dyn_cast<CXXRecordDecl>( 10431 TheEnumDecl->getDeclContext()->getRedeclContext())) 10432 if (!TheEnumDecl->isScoped() && 10433 Record->getIdentifier() && Record->getIdentifier() == Id) 10434 Diag(IdLoc, diag::err_member_name_of_class) << Id; 10435 10436 EnumConstantDecl *New = 10437 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 10438 10439 if (New) { 10440 // Process attributes. 10441 if (Attr) ProcessDeclAttributeList(S, New, Attr); 10442 10443 // Register this decl in the current scope stack. 10444 New->setAccess(TheEnumDecl->getAccess()); 10445 PushOnScopeChains(New, S); 10446 } 10447 10448 ActOnDocumentableDecl(New); 10449 10450 return New; 10451} 10452 10453// Emits a warning if every element in the enum is the same value and if 10454// every element is initialized with a integer or boolean literal. 10455static void CheckForUniqueEnumValues(Sema &S, Decl **Elements, 10456 unsigned NumElements, EnumDecl *Enum, 10457 QualType EnumType) { 10458 if (S.Diags.getDiagnosticLevel(diag::warn_identical_enum_values, 10459 Enum->getLocation()) == 10460 DiagnosticsEngine::Ignored) 10461 return; 10462 10463 if (NumElements < 2) 10464 return; 10465 10466 if (!Enum->getIdentifier()) 10467 return; 10468 10469 llvm::APSInt FirstVal; 10470 10471 for (unsigned i = 0; i != NumElements; ++i) { 10472 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10473 if (!ECD) 10474 return; 10475 10476 Expr *InitExpr = ECD->getInitExpr(); 10477 if (!InitExpr) 10478 return; 10479 InitExpr = InitExpr->IgnoreImpCasts(); 10480 if (!isa<IntegerLiteral>(InitExpr) && !isa<CXXBoolLiteralExpr>(InitExpr)) 10481 return; 10482 10483 if (i == 0) { 10484 FirstVal = ECD->getInitVal(); 10485 continue; 10486 } 10487 10488 if (!llvm::APSInt::isSameValue(FirstVal, ECD->getInitVal())) 10489 return; 10490 } 10491 10492 S.Diag(Enum->getLocation(), diag::warn_identical_enum_values) 10493 << EnumType << FirstVal.toString(10) 10494 << Enum->getSourceRange(); 10495 10496 EnumConstantDecl *Last = cast<EnumConstantDecl>(Elements[NumElements - 1]), 10497 *Next = cast<EnumConstantDecl>(Elements[NumElements - 2]); 10498 10499 S.Diag(Last->getLocation(), diag::note_identical_enum_values) 10500 << FixItHint::CreateReplacement(Last->getInitExpr()->getSourceRange(), 10501 Next->getName()); 10502} 10503 10504void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 10505 SourceLocation RBraceLoc, Decl *EnumDeclX, 10506 Decl **Elements, unsigned NumElements, 10507 Scope *S, AttributeList *Attr) { 10508 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 10509 QualType EnumType = Context.getTypeDeclType(Enum); 10510 10511 if (Attr) 10512 ProcessDeclAttributeList(S, Enum, Attr); 10513 10514 if (Enum->isDependentType()) { 10515 for (unsigned i = 0; i != NumElements; ++i) { 10516 EnumConstantDecl *ECD = 10517 cast_or_null<EnumConstantDecl>(Elements[i]); 10518 if (!ECD) continue; 10519 10520 ECD->setType(EnumType); 10521 } 10522 10523 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 10524 return; 10525 } 10526 10527 // TODO: If the result value doesn't fit in an int, it must be a long or long 10528 // long value. ISO C does not support this, but GCC does as an extension, 10529 // emit a warning. 10530 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10531 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 10532 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 10533 10534 // Verify that all the values are okay, compute the size of the values, and 10535 // reverse the list. 10536 unsigned NumNegativeBits = 0; 10537 unsigned NumPositiveBits = 0; 10538 10539 // Keep track of whether all elements have type int. 10540 bool AllElementsInt = true; 10541 10542 for (unsigned i = 0; i != NumElements; ++i) { 10543 EnumConstantDecl *ECD = 10544 cast_or_null<EnumConstantDecl>(Elements[i]); 10545 if (!ECD) continue; // Already issued a diagnostic. 10546 10547 const llvm::APSInt &InitVal = ECD->getInitVal(); 10548 10549 // Keep track of the size of positive and negative values. 10550 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 10551 NumPositiveBits = std::max(NumPositiveBits, 10552 (unsigned)InitVal.getActiveBits()); 10553 else 10554 NumNegativeBits = std::max(NumNegativeBits, 10555 (unsigned)InitVal.getMinSignedBits()); 10556 10557 // Keep track of whether every enum element has type int (very commmon). 10558 if (AllElementsInt) 10559 AllElementsInt = ECD->getType() == Context.IntTy; 10560 } 10561 10562 // Figure out the type that should be used for this enum. 10563 QualType BestType; 10564 unsigned BestWidth; 10565 10566 // C++0x N3000 [conv.prom]p3: 10567 // An rvalue of an unscoped enumeration type whose underlying 10568 // type is not fixed can be converted to an rvalue of the first 10569 // of the following types that can represent all the values of 10570 // the enumeration: int, unsigned int, long int, unsigned long 10571 // int, long long int, or unsigned long long int. 10572 // C99 6.4.4.3p2: 10573 // An identifier declared as an enumeration constant has type int. 10574 // The C99 rule is modified by a gcc extension 10575 QualType BestPromotionType; 10576 10577 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 10578 // -fshort-enums is the equivalent to specifying the packed attribute on all 10579 // enum definitions. 10580 if (LangOpts.ShortEnums) 10581 Packed = true; 10582 10583 if (Enum->isFixed()) { 10584 BestType = Enum->getIntegerType(); 10585 if (BestType->isPromotableIntegerType()) 10586 BestPromotionType = Context.getPromotedIntegerType(BestType); 10587 else 10588 BestPromotionType = BestType; 10589 // We don't need to set BestWidth, because BestType is going to be the type 10590 // of the enumerators, but we do anyway because otherwise some compilers 10591 // warn that it might be used uninitialized. 10592 BestWidth = CharWidth; 10593 } 10594 else if (NumNegativeBits) { 10595 // If there is a negative value, figure out the smallest integer type (of 10596 // int/long/longlong) that fits. 10597 // If it's packed, check also if it fits a char or a short. 10598 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 10599 BestType = Context.SignedCharTy; 10600 BestWidth = CharWidth; 10601 } else if (Packed && NumNegativeBits <= ShortWidth && 10602 NumPositiveBits < ShortWidth) { 10603 BestType = Context.ShortTy; 10604 BestWidth = ShortWidth; 10605 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 10606 BestType = Context.IntTy; 10607 BestWidth = IntWidth; 10608 } else { 10609 BestWidth = Context.getTargetInfo().getLongWidth(); 10610 10611 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 10612 BestType = Context.LongTy; 10613 } else { 10614 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10615 10616 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 10617 Diag(Enum->getLocation(), diag::warn_enum_too_large); 10618 BestType = Context.LongLongTy; 10619 } 10620 } 10621 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 10622 } else { 10623 // If there is no negative value, figure out the smallest type that fits 10624 // all of the enumerator values. 10625 // If it's packed, check also if it fits a char or a short. 10626 if (Packed && NumPositiveBits <= CharWidth) { 10627 BestType = Context.UnsignedCharTy; 10628 BestPromotionType = Context.IntTy; 10629 BestWidth = CharWidth; 10630 } else if (Packed && NumPositiveBits <= ShortWidth) { 10631 BestType = Context.UnsignedShortTy; 10632 BestPromotionType = Context.IntTy; 10633 BestWidth = ShortWidth; 10634 } else if (NumPositiveBits <= IntWidth) { 10635 BestType = Context.UnsignedIntTy; 10636 BestWidth = IntWidth; 10637 BestPromotionType 10638 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10639 ? Context.UnsignedIntTy : Context.IntTy; 10640 } else if (NumPositiveBits <= 10641 (BestWidth = Context.getTargetInfo().getLongWidth())) { 10642 BestType = Context.UnsignedLongTy; 10643 BestPromotionType 10644 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10645 ? Context.UnsignedLongTy : Context.LongTy; 10646 } else { 10647 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10648 assert(NumPositiveBits <= BestWidth && 10649 "How could an initializer get larger than ULL?"); 10650 BestType = Context.UnsignedLongLongTy; 10651 BestPromotionType 10652 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10653 ? Context.UnsignedLongLongTy : Context.LongLongTy; 10654 } 10655 } 10656 10657 // Loop over all of the enumerator constants, changing their types to match 10658 // the type of the enum if needed. 10659 for (unsigned i = 0; i != NumElements; ++i) { 10660 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10661 if (!ECD) continue; // Already issued a diagnostic. 10662 10663 // Standard C says the enumerators have int type, but we allow, as an 10664 // extension, the enumerators to be larger than int size. If each 10665 // enumerator value fits in an int, type it as an int, otherwise type it the 10666 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 10667 // that X has type 'int', not 'unsigned'. 10668 10669 // Determine whether the value fits into an int. 10670 llvm::APSInt InitVal = ECD->getInitVal(); 10671 10672 // If it fits into an integer type, force it. Otherwise force it to match 10673 // the enum decl type. 10674 QualType NewTy; 10675 unsigned NewWidth; 10676 bool NewSign; 10677 if (!getLangOpts().CPlusPlus && 10678 !Enum->isFixed() && 10679 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 10680 NewTy = Context.IntTy; 10681 NewWidth = IntWidth; 10682 NewSign = true; 10683 } else if (ECD->getType() == BestType) { 10684 // Already the right type! 10685 if (getLangOpts().CPlusPlus) 10686 // C++ [dcl.enum]p4: Following the closing brace of an 10687 // enum-specifier, each enumerator has the type of its 10688 // enumeration. 10689 ECD->setType(EnumType); 10690 continue; 10691 } else { 10692 NewTy = BestType; 10693 NewWidth = BestWidth; 10694 NewSign = BestType->isSignedIntegerOrEnumerationType(); 10695 } 10696 10697 // Adjust the APSInt value. 10698 InitVal = InitVal.extOrTrunc(NewWidth); 10699 InitVal.setIsSigned(NewSign); 10700 ECD->setInitVal(InitVal); 10701 10702 // Adjust the Expr initializer and type. 10703 if (ECD->getInitExpr() && 10704 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10705 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10706 CK_IntegralCast, 10707 ECD->getInitExpr(), 10708 /*base paths*/ 0, 10709 VK_RValue)); 10710 if (getLangOpts().CPlusPlus) 10711 // C++ [dcl.enum]p4: Following the closing brace of an 10712 // enum-specifier, each enumerator has the type of its 10713 // enumeration. 10714 ECD->setType(EnumType); 10715 else 10716 ECD->setType(NewTy); 10717 } 10718 10719 Enum->completeDefinition(BestType, BestPromotionType, 10720 NumPositiveBits, NumNegativeBits); 10721 10722 // If we're declaring a function, ensure this decl isn't forgotten about - 10723 // it needs to go into the function scope. 10724 if (InFunctionDeclarator) 10725 DeclsInPrototypeScope.push_back(Enum); 10726 10727 CheckForUniqueEnumValues(*this, Elements, NumElements, Enum, EnumType); 10728} 10729 10730Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10731 SourceLocation StartLoc, 10732 SourceLocation EndLoc) { 10733 StringLiteral *AsmString = cast<StringLiteral>(expr); 10734 10735 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10736 AsmString, StartLoc, 10737 EndLoc); 10738 CurContext->addDecl(New); 10739 return New; 10740} 10741 10742DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10743 SourceLocation ImportLoc, 10744 ModuleIdPath Path) { 10745 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10746 Module::AllVisible, 10747 /*IsIncludeDirective=*/false); 10748 if (!Mod) 10749 return true; 10750 10751 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10752 Module *ModCheck = Mod; 10753 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10754 // If we've run out of module parents, just drop the remaining identifiers. 10755 // We need the length to be consistent. 10756 if (!ModCheck) 10757 break; 10758 ModCheck = ModCheck->Parent; 10759 10760 IdentifierLocs.push_back(Path[I].second); 10761 } 10762 10763 ImportDecl *Import = ImportDecl::Create(Context, 10764 Context.getTranslationUnitDecl(), 10765 AtLoc.isValid()? AtLoc : ImportLoc, 10766 Mod, IdentifierLocs); 10767 Context.getTranslationUnitDecl()->addDecl(Import); 10768 return Import; 10769} 10770 10771void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name, 10772 IdentifierInfo* AliasName, 10773 SourceLocation PragmaLoc, 10774 SourceLocation NameLoc, 10775 SourceLocation AliasNameLoc) { 10776 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, 10777 LookupOrdinaryName); 10778 AsmLabelAttr *Attr = 10779 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName()); 10780 10781 if (PrevDecl) 10782 PrevDecl->addAttr(Attr); 10783 else 10784 (void)ExtnameUndeclaredIdentifiers.insert( 10785 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr)); 10786} 10787 10788void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10789 SourceLocation PragmaLoc, 10790 SourceLocation NameLoc) { 10791 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10792 10793 if (PrevDecl) { 10794 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10795 } else { 10796 (void)WeakUndeclaredIdentifiers.insert( 10797 std::pair<IdentifierInfo*,WeakInfo> 10798 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10799 } 10800} 10801 10802void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10803 IdentifierInfo* AliasName, 10804 SourceLocation PragmaLoc, 10805 SourceLocation NameLoc, 10806 SourceLocation AliasNameLoc) { 10807 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10808 LookupOrdinaryName); 10809 WeakInfo W = WeakInfo(Name, NameLoc); 10810 10811 if (PrevDecl) { 10812 if (!PrevDecl->hasAttr<AliasAttr>()) 10813 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10814 DeclApplyPragmaWeak(TUScope, ND, W); 10815 } else { 10816 (void)WeakUndeclaredIdentifiers.insert( 10817 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10818 } 10819} 10820 10821Decl *Sema::getObjCDeclContext() const { 10822 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10823} 10824 10825AvailabilityResult Sema::getCurContextAvailability() const { 10826 const Decl *D = cast<Decl>(getCurLexicalContext()); 10827 // A category implicitly has the availability of the interface. 10828 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10829 D = CatD->getClassInterface(); 10830 10831 return D->getAvailability(); 10832} 10833