SemaDecl.cpp revision 0cd00be2813db976d62fb88fa26ccca8d6791823
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/DeclCXX.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclTemplate.h" 27#include "clang/AST/EvaluatedExprVisitor.h" 28#include "clang/AST/ExprCXX.h" 29#include "clang/AST/StmtCXX.h" 30#include "clang/AST/CharUnits.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Parse/ParseDiagnostic.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Sema/DelayedDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "clang/Lex/ModuleLoader.h" 42#include "llvm/ADT/SmallString.h" 43#include "llvm/ADT/Triple.h" 44#include <algorithm> 45#include <cstring> 46#include <functional> 47using namespace clang; 48using namespace sema; 49 50Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 51 if (OwnedType) { 52 Decl *Group[2] = { OwnedType, Ptr }; 53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 54 } 55 56 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 57} 58 59namespace { 60 61class TypeNameValidatorCCC : public CorrectionCandidateCallback { 62 public: 63 TypeNameValidatorCCC(bool AllowInvalid) : AllowInvalidDecl(AllowInvalid) { 64 WantExpressionKeywords = false; 65 WantCXXNamedCasts = false; 66 WantRemainingKeywords = false; 67 } 68 69 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 70 if (NamedDecl *ND = candidate.getCorrectionDecl()) 71 return (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) && 72 (AllowInvalidDecl || !ND->isInvalidDecl()); 73 else 74 return candidate.isKeyword(); 75 } 76 77 private: 78 bool AllowInvalidDecl; 79}; 80 81} 82 83/// \brief If the identifier refers to a type name within this scope, 84/// return the declaration of that type. 85/// 86/// This routine performs ordinary name lookup of the identifier II 87/// within the given scope, with optional C++ scope specifier SS, to 88/// determine whether the name refers to a type. If so, returns an 89/// opaque pointer (actually a QualType) corresponding to that 90/// type. Otherwise, returns NULL. 91/// 92/// If name lookup results in an ambiguity, this routine will complain 93/// and then return NULL. 94ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 95 Scope *S, CXXScopeSpec *SS, 96 bool isClassName, bool HasTrailingDot, 97 ParsedType ObjectTypePtr, 98 bool IsCtorOrDtorName, 99 bool WantNontrivialTypeSourceInfo, 100 IdentifierInfo **CorrectedII) { 101 // Determine where we will perform name lookup. 102 DeclContext *LookupCtx = 0; 103 if (ObjectTypePtr) { 104 QualType ObjectType = ObjectTypePtr.get(); 105 if (ObjectType->isRecordType()) 106 LookupCtx = computeDeclContext(ObjectType); 107 } else if (SS && SS->isNotEmpty()) { 108 LookupCtx = computeDeclContext(*SS, false); 109 110 if (!LookupCtx) { 111 if (isDependentScopeSpecifier(*SS)) { 112 // C++ [temp.res]p3: 113 // A qualified-id that refers to a type and in which the 114 // nested-name-specifier depends on a template-parameter (14.6.2) 115 // shall be prefixed by the keyword typename to indicate that the 116 // qualified-id denotes a type, forming an 117 // elaborated-type-specifier (7.1.5.3). 118 // 119 // We therefore do not perform any name lookup if the result would 120 // refer to a member of an unknown specialization. 121 if (!isClassName && !IsCtorOrDtorName) 122 return ParsedType(); 123 124 // We know from the grammar that this name refers to a type, 125 // so build a dependent node to describe the type. 126 if (WantNontrivialTypeSourceInfo) 127 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 128 129 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 130 QualType T = 131 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 132 II, NameLoc); 133 134 return ParsedType::make(T); 135 } 136 137 return ParsedType(); 138 } 139 140 if (!LookupCtx->isDependentContext() && 141 RequireCompleteDeclContext(*SS, LookupCtx)) 142 return ParsedType(); 143 } 144 145 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 146 // lookup for class-names. 147 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 148 LookupOrdinaryName; 149 LookupResult Result(*this, &II, NameLoc, Kind); 150 if (LookupCtx) { 151 // Perform "qualified" name lookup into the declaration context we 152 // computed, which is either the type of the base of a member access 153 // expression or the declaration context associated with a prior 154 // nested-name-specifier. 155 LookupQualifiedName(Result, LookupCtx); 156 157 if (ObjectTypePtr && Result.empty()) { 158 // C++ [basic.lookup.classref]p3: 159 // If the unqualified-id is ~type-name, the type-name is looked up 160 // in the context of the entire postfix-expression. If the type T of 161 // the object expression is of a class type C, the type-name is also 162 // looked up in the scope of class C. At least one of the lookups shall 163 // find a name that refers to (possibly cv-qualified) T. 164 LookupName(Result, S); 165 } 166 } else { 167 // Perform unqualified name lookup. 168 LookupName(Result, S); 169 } 170 171 NamedDecl *IIDecl = 0; 172 switch (Result.getResultKind()) { 173 case LookupResult::NotFound: 174 case LookupResult::NotFoundInCurrentInstantiation: 175 if (CorrectedII) { 176 TypeNameValidatorCCC Validator(true); 177 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 178 Kind, S, SS, Validator); 179 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 180 TemplateTy Template; 181 bool MemberOfUnknownSpecialization; 182 UnqualifiedId TemplateName; 183 TemplateName.setIdentifier(NewII, NameLoc); 184 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 185 CXXScopeSpec NewSS, *NewSSPtr = SS; 186 if (SS && NNS) { 187 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 188 NewSSPtr = &NewSS; 189 } 190 if (Correction && (NNS || NewII != &II) && 191 // Ignore a correction to a template type as the to-be-corrected 192 // identifier is not a template (typo correction for template names 193 // is handled elsewhere). 194 !(getLangOpts().CPlusPlus && NewSSPtr && 195 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 196 false, Template, MemberOfUnknownSpecialization))) { 197 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 198 isClassName, HasTrailingDot, ObjectTypePtr, 199 IsCtorOrDtorName, 200 WantNontrivialTypeSourceInfo); 201 if (Ty) { 202 std::string CorrectedStr(Correction.getAsString(getLangOpts())); 203 std::string CorrectedQuotedStr( 204 Correction.getQuoted(getLangOpts())); 205 Diag(NameLoc, diag::err_unknown_typename_suggest) 206 << Result.getLookupName() << CorrectedQuotedStr 207 << FixItHint::CreateReplacement(SourceRange(NameLoc), 208 CorrectedStr); 209 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 210 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 211 << CorrectedQuotedStr; 212 213 if (SS && NNS) 214 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 215 *CorrectedII = NewII; 216 return Ty; 217 } 218 } 219 } 220 // If typo correction failed or was not performed, fall through 221 case LookupResult::FoundOverloaded: 222 case LookupResult::FoundUnresolvedValue: 223 Result.suppressDiagnostics(); 224 return ParsedType(); 225 226 case LookupResult::Ambiguous: 227 // Recover from type-hiding ambiguities by hiding the type. We'll 228 // do the lookup again when looking for an object, and we can 229 // diagnose the error then. If we don't do this, then the error 230 // about hiding the type will be immediately followed by an error 231 // that only makes sense if the identifier was treated like a type. 232 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 233 Result.suppressDiagnostics(); 234 return ParsedType(); 235 } 236 237 // Look to see if we have a type anywhere in the list of results. 238 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 239 Res != ResEnd; ++Res) { 240 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 241 if (!IIDecl || 242 (*Res)->getLocation().getRawEncoding() < 243 IIDecl->getLocation().getRawEncoding()) 244 IIDecl = *Res; 245 } 246 } 247 248 if (!IIDecl) { 249 // None of the entities we found is a type, so there is no way 250 // to even assume that the result is a type. In this case, don't 251 // complain about the ambiguity. The parser will either try to 252 // perform this lookup again (e.g., as an object name), which 253 // will produce the ambiguity, or will complain that it expected 254 // a type name. 255 Result.suppressDiagnostics(); 256 return ParsedType(); 257 } 258 259 // We found a type within the ambiguous lookup; diagnose the 260 // ambiguity and then return that type. This might be the right 261 // answer, or it might not be, but it suppresses any attempt to 262 // perform the name lookup again. 263 break; 264 265 case LookupResult::Found: 266 IIDecl = Result.getFoundDecl(); 267 break; 268 } 269 270 assert(IIDecl && "Didn't find decl"); 271 272 QualType T; 273 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 274 DiagnoseUseOfDecl(IIDecl, NameLoc); 275 276 if (T.isNull()) 277 T = Context.getTypeDeclType(TD); 278 279 // NOTE: avoid constructing an ElaboratedType(Loc) if this is a 280 // constructor or destructor name (in such a case, the scope specifier 281 // will be attached to the enclosing Expr or Decl node). 282 if (SS && SS->isNotEmpty() && !IsCtorOrDtorName) { 283 if (WantNontrivialTypeSourceInfo) { 284 // Construct a type with type-source information. 285 TypeLocBuilder Builder; 286 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 287 288 T = getElaboratedType(ETK_None, *SS, T); 289 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 290 ElabTL.setElaboratedKeywordLoc(SourceLocation()); 291 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 292 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 293 } else { 294 T = getElaboratedType(ETK_None, *SS, T); 295 } 296 } 297 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 298 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 299 if (!HasTrailingDot) 300 T = Context.getObjCInterfaceType(IDecl); 301 } 302 303 if (T.isNull()) { 304 // If it's not plausibly a type, suppress diagnostics. 305 Result.suppressDiagnostics(); 306 return ParsedType(); 307 } 308 return ParsedType::make(T); 309} 310 311/// isTagName() - This method is called *for error recovery purposes only* 312/// to determine if the specified name is a valid tag name ("struct foo"). If 313/// so, this returns the TST for the tag corresponding to it (TST_enum, 314/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 315/// where the user forgot to specify the tag. 316DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 317 // Do a tag name lookup in this scope. 318 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 319 LookupName(R, S, false); 320 R.suppressDiagnostics(); 321 if (R.getResultKind() == LookupResult::Found) 322 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 323 switch (TD->getTagKind()) { 324 case TTK_Struct: return DeclSpec::TST_struct; 325 case TTK_Union: return DeclSpec::TST_union; 326 case TTK_Class: return DeclSpec::TST_class; 327 case TTK_Enum: return DeclSpec::TST_enum; 328 } 329 } 330 331 return DeclSpec::TST_unspecified; 332} 333 334/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 335/// if a CXXScopeSpec's type is equal to the type of one of the base classes 336/// then downgrade the missing typename error to a warning. 337/// This is needed for MSVC compatibility; Example: 338/// @code 339/// template<class T> class A { 340/// public: 341/// typedef int TYPE; 342/// }; 343/// template<class T> class B : public A<T> { 344/// public: 345/// A<T>::TYPE a; // no typename required because A<T> is a base class. 346/// }; 347/// @endcode 348bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 349 if (CurContext->isRecord()) { 350 const Type *Ty = SS->getScopeRep()->getAsType(); 351 352 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 353 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 354 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 355 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 356 return true; 357 return S->isFunctionPrototypeScope(); 358 } 359 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 360} 361 362bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 363 SourceLocation IILoc, 364 Scope *S, 365 CXXScopeSpec *SS, 366 ParsedType &SuggestedType) { 367 // We don't have anything to suggest (yet). 368 SuggestedType = ParsedType(); 369 370 // There may have been a typo in the name of the type. Look up typo 371 // results, in case we have something that we can suggest. 372 TypeNameValidatorCCC Validator(false); 373 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 374 LookupOrdinaryName, S, SS, 375 Validator)) { 376 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 377 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 378 379 if (Corrected.isKeyword()) { 380 // We corrected to a keyword. 381 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 382 Diag(IILoc, diag::err_unknown_typename_suggest) 383 << &II << CorrectedQuotedStr; 384 } else { 385 NamedDecl *Result = Corrected.getCorrectionDecl(); 386 // We found a similarly-named type or interface; suggest that. 387 if (!SS || !SS->isSet()) 388 Diag(IILoc, diag::err_unknown_typename_suggest) 389 << &II << CorrectedQuotedStr 390 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 391 else if (DeclContext *DC = computeDeclContext(*SS, false)) 392 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 393 << &II << DC << CorrectedQuotedStr << SS->getRange() 394 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 395 else 396 llvm_unreachable("could not have corrected a typo here"); 397 398 Diag(Result->getLocation(), diag::note_previous_decl) 399 << CorrectedQuotedStr; 400 401 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 402 false, false, ParsedType(), 403 /*IsCtorOrDtorName=*/false, 404 /*NonTrivialTypeSourceInfo=*/true); 405 } 406 return true; 407 } 408 409 if (getLangOpts().CPlusPlus) { 410 // See if II is a class template that the user forgot to pass arguments to. 411 UnqualifiedId Name; 412 Name.setIdentifier(&II, IILoc); 413 CXXScopeSpec EmptySS; 414 TemplateTy TemplateResult; 415 bool MemberOfUnknownSpecialization; 416 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 417 Name, ParsedType(), true, TemplateResult, 418 MemberOfUnknownSpecialization) == TNK_Type_template) { 419 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 420 Diag(IILoc, diag::err_template_missing_args) << TplName; 421 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 422 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 423 << TplDecl->getTemplateParameters()->getSourceRange(); 424 } 425 return true; 426 } 427 } 428 429 // FIXME: Should we move the logic that tries to recover from a missing tag 430 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 431 432 if (!SS || (!SS->isSet() && !SS->isInvalid())) 433 Diag(IILoc, diag::err_unknown_typename) << &II; 434 else if (DeclContext *DC = computeDeclContext(*SS, false)) 435 Diag(IILoc, diag::err_typename_nested_not_found) 436 << &II << DC << SS->getRange(); 437 else if (isDependentScopeSpecifier(*SS)) { 438 unsigned DiagID = diag::err_typename_missing; 439 if (getLangOpts().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 440 DiagID = diag::warn_typename_missing; 441 442 Diag(SS->getRange().getBegin(), DiagID) 443 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 444 << SourceRange(SS->getRange().getBegin(), IILoc) 445 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 446 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 447 .get(); 448 } else { 449 assert(SS && SS->isInvalid() && 450 "Invalid scope specifier has already been diagnosed"); 451 } 452 453 return true; 454} 455 456/// \brief Determine whether the given result set contains either a type name 457/// or 458static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 459 bool CheckTemplate = R.getSema().getLangOpts().CPlusPlus && 460 NextToken.is(tok::less); 461 462 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 463 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 464 return true; 465 466 if (CheckTemplate && isa<TemplateDecl>(*I)) 467 return true; 468 } 469 470 return false; 471} 472 473static bool isTagTypeWithMissingTag(Sema &SemaRef, LookupResult &Result, 474 Scope *S, CXXScopeSpec &SS, 475 IdentifierInfo *&Name, 476 SourceLocation NameLoc) { 477 Result.clear(Sema::LookupTagName); 478 SemaRef.LookupParsedName(Result, S, &SS); 479 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 480 const char *TagName = 0; 481 const char *FixItTagName = 0; 482 switch (Tag->getTagKind()) { 483 case TTK_Class: 484 TagName = "class"; 485 FixItTagName = "class "; 486 break; 487 488 case TTK_Enum: 489 TagName = "enum"; 490 FixItTagName = "enum "; 491 break; 492 493 case TTK_Struct: 494 TagName = "struct"; 495 FixItTagName = "struct "; 496 break; 497 498 case TTK_Union: 499 TagName = "union"; 500 FixItTagName = "union "; 501 break; 502 } 503 504 SemaRef.Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 505 << Name << TagName << SemaRef.getLangOpts().CPlusPlus 506 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 507 508 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupOrdinaryName); 509 if (SemaRef.LookupParsedName(R, S, &SS)) { 510 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); 511 I != IEnd; ++I) 512 SemaRef.Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type) 513 << Name << TagName; 514 } 515 return true; 516 } 517 518 Result.clear(Sema::LookupOrdinaryName); 519 return false; 520} 521 522Sema::NameClassification Sema::ClassifyName(Scope *S, 523 CXXScopeSpec &SS, 524 IdentifierInfo *&Name, 525 SourceLocation NameLoc, 526 const Token &NextToken) { 527 DeclarationNameInfo NameInfo(Name, NameLoc); 528 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 529 530 if (NextToken.is(tok::coloncolon)) { 531 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 532 QualType(), false, SS, 0, false); 533 534 } 535 536 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 537 LookupParsedName(Result, S, &SS, !CurMethod); 538 539 // Perform lookup for Objective-C instance variables (including automatically 540 // synthesized instance variables), if we're in an Objective-C method. 541 // FIXME: This lookup really, really needs to be folded in to the normal 542 // unqualified lookup mechanism. 543 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 544 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 545 if (E.get() || E.isInvalid()) 546 return E; 547 } 548 549 bool SecondTry = false; 550 bool IsFilteredTemplateName = false; 551 552Corrected: 553 switch (Result.getResultKind()) { 554 case LookupResult::NotFound: 555 // If an unqualified-id is followed by a '(', then we have a function 556 // call. 557 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 558 // In C++, this is an ADL-only call. 559 // FIXME: Reference? 560 if (getLangOpts().CPlusPlus) 561 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 562 563 // C90 6.3.2.2: 564 // If the expression that precedes the parenthesized argument list in a 565 // function call consists solely of an identifier, and if no 566 // declaration is visible for this identifier, the identifier is 567 // implicitly declared exactly as if, in the innermost block containing 568 // the function call, the declaration 569 // 570 // extern int identifier (); 571 // 572 // appeared. 573 // 574 // We also allow this in C99 as an extension. 575 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 576 Result.addDecl(D); 577 Result.resolveKind(); 578 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 579 } 580 } 581 582 // In C, we first see whether there is a tag type by the same name, in 583 // which case it's likely that the user just forget to write "enum", 584 // "struct", or "union". 585 if (!getLangOpts().CPlusPlus && !SecondTry && 586 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) { 587 break; 588 } 589 590 // Perform typo correction to determine if there is another name that is 591 // close to this name. 592 if (!SecondTry) { 593 SecondTry = true; 594 CorrectionCandidateCallback DefaultValidator; 595 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 596 Result.getLookupKind(), S, 597 &SS, DefaultValidator)) { 598 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 599 unsigned QualifiedDiag = diag::err_no_member_suggest; 600 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 601 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 602 603 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 604 NamedDecl *UnderlyingFirstDecl 605 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 606 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 607 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 608 UnqualifiedDiag = diag::err_no_template_suggest; 609 QualifiedDiag = diag::err_no_member_template_suggest; 610 } else if (UnderlyingFirstDecl && 611 (isa<TypeDecl>(UnderlyingFirstDecl) || 612 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 613 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 614 UnqualifiedDiag = diag::err_unknown_typename_suggest; 615 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 616 } 617 618 if (SS.isEmpty()) 619 Diag(NameLoc, UnqualifiedDiag) 620 << Name << CorrectedQuotedStr 621 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 622 else 623 Diag(NameLoc, QualifiedDiag) 624 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 625 << SS.getRange() 626 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 627 628 // Update the name, so that the caller has the new name. 629 Name = Corrected.getCorrectionAsIdentifierInfo(); 630 631 // Typo correction corrected to a keyword. 632 if (Corrected.isKeyword()) 633 return Corrected.getCorrectionAsIdentifierInfo(); 634 635 // Also update the LookupResult... 636 // FIXME: This should probably go away at some point 637 Result.clear(); 638 Result.setLookupName(Corrected.getCorrection()); 639 if (FirstDecl) { 640 Result.addDecl(FirstDecl); 641 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 642 << CorrectedQuotedStr; 643 } 644 645 // If we found an Objective-C instance variable, let 646 // LookupInObjCMethod build the appropriate expression to 647 // reference the ivar. 648 // FIXME: This is a gross hack. 649 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 650 Result.clear(); 651 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 652 return move(E); 653 } 654 655 goto Corrected; 656 } 657 } 658 659 // We failed to correct; just fall through and let the parser deal with it. 660 Result.suppressDiagnostics(); 661 return NameClassification::Unknown(); 662 663 case LookupResult::NotFoundInCurrentInstantiation: { 664 // We performed name lookup into the current instantiation, and there were 665 // dependent bases, so we treat this result the same way as any other 666 // dependent nested-name-specifier. 667 668 // C++ [temp.res]p2: 669 // A name used in a template declaration or definition and that is 670 // dependent on a template-parameter is assumed not to name a type 671 // unless the applicable name lookup finds a type name or the name is 672 // qualified by the keyword typename. 673 // 674 // FIXME: If the next token is '<', we might want to ask the parser to 675 // perform some heroics to see if we actually have a 676 // template-argument-list, which would indicate a missing 'template' 677 // keyword here. 678 return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(), 679 NameInfo, /*TemplateArgs=*/0); 680 } 681 682 case LookupResult::Found: 683 case LookupResult::FoundOverloaded: 684 case LookupResult::FoundUnresolvedValue: 685 break; 686 687 case LookupResult::Ambiguous: 688 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 689 hasAnyAcceptableTemplateNames(Result)) { 690 // C++ [temp.local]p3: 691 // A lookup that finds an injected-class-name (10.2) can result in an 692 // ambiguity in certain cases (for example, if it is found in more than 693 // one base class). If all of the injected-class-names that are found 694 // refer to specializations of the same class template, and if the name 695 // is followed by a template-argument-list, the reference refers to the 696 // class template itself and not a specialization thereof, and is not 697 // ambiguous. 698 // 699 // This filtering can make an ambiguous result into an unambiguous one, 700 // so try again after filtering out template names. 701 FilterAcceptableTemplateNames(Result); 702 if (!Result.isAmbiguous()) { 703 IsFilteredTemplateName = true; 704 break; 705 } 706 } 707 708 // Diagnose the ambiguity and return an error. 709 return NameClassification::Error(); 710 } 711 712 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 713 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 714 // C++ [temp.names]p3: 715 // After name lookup (3.4) finds that a name is a template-name or that 716 // an operator-function-id or a literal- operator-id refers to a set of 717 // overloaded functions any member of which is a function template if 718 // this is followed by a <, the < is always taken as the delimiter of a 719 // template-argument-list and never as the less-than operator. 720 if (!IsFilteredTemplateName) 721 FilterAcceptableTemplateNames(Result); 722 723 if (!Result.empty()) { 724 bool IsFunctionTemplate; 725 TemplateName Template; 726 if (Result.end() - Result.begin() > 1) { 727 IsFunctionTemplate = true; 728 Template = Context.getOverloadedTemplateName(Result.begin(), 729 Result.end()); 730 } else { 731 TemplateDecl *TD 732 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 733 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 734 735 if (SS.isSet() && !SS.isInvalid()) 736 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 737 /*TemplateKeyword=*/false, 738 TD); 739 else 740 Template = TemplateName(TD); 741 } 742 743 if (IsFunctionTemplate) { 744 // Function templates always go through overload resolution, at which 745 // point we'll perform the various checks (e.g., accessibility) we need 746 // to based on which function we selected. 747 Result.suppressDiagnostics(); 748 749 return NameClassification::FunctionTemplate(Template); 750 } 751 752 return NameClassification::TypeTemplate(Template); 753 } 754 } 755 756 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 757 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 758 DiagnoseUseOfDecl(Type, NameLoc); 759 QualType T = Context.getTypeDeclType(Type); 760 return ParsedType::make(T); 761 } 762 763 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 764 if (!Class) { 765 // FIXME: It's unfortunate that we don't have a Type node for handling this. 766 if (ObjCCompatibleAliasDecl *Alias 767 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 768 Class = Alias->getClassInterface(); 769 } 770 771 if (Class) { 772 DiagnoseUseOfDecl(Class, NameLoc); 773 774 if (NextToken.is(tok::period)) { 775 // Interface. <something> is parsed as a property reference expression. 776 // Just return "unknown" as a fall-through for now. 777 Result.suppressDiagnostics(); 778 return NameClassification::Unknown(); 779 } 780 781 QualType T = Context.getObjCInterfaceType(Class); 782 return ParsedType::make(T); 783 } 784 785 // Check for a tag type hidden by a non-type decl in a few cases where it 786 // seems likely a type is wanted instead of the non-type that was found. 787 if (!getLangOpts().ObjC1 && FirstDecl && !isa<ClassTemplateDecl>(FirstDecl) && 788 !isa<TypeAliasTemplateDecl>(FirstDecl)) { 789 bool NextIsOp = NextToken.is(tok::amp) || NextToken.is(tok::star); 790 if ((NextToken.is(tok::identifier) || 791 (NextIsOp && FirstDecl->isFunctionOrFunctionTemplate())) && 792 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) { 793 FirstDecl = (*Result.begin())->getUnderlyingDecl(); 794 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 795 DiagnoseUseOfDecl(Type, NameLoc); 796 QualType T = Context.getTypeDeclType(Type); 797 return ParsedType::make(T); 798 } 799 } 800 } 801 802 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 803 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0); 804 805 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 806 return BuildDeclarationNameExpr(SS, Result, ADL); 807} 808 809// Determines the context to return to after temporarily entering a 810// context. This depends in an unnecessarily complicated way on the 811// exact ordering of callbacks from the parser. 812DeclContext *Sema::getContainingDC(DeclContext *DC) { 813 814 // Functions defined inline within classes aren't parsed until we've 815 // finished parsing the top-level class, so the top-level class is 816 // the context we'll need to return to. 817 if (isa<FunctionDecl>(DC)) { 818 DC = DC->getLexicalParent(); 819 820 // A function not defined within a class will always return to its 821 // lexical context. 822 if (!isa<CXXRecordDecl>(DC)) 823 return DC; 824 825 // A C++ inline method/friend is parsed *after* the topmost class 826 // it was declared in is fully parsed ("complete"); the topmost 827 // class is the context we need to return to. 828 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 829 DC = RD; 830 831 // Return the declaration context of the topmost class the inline method is 832 // declared in. 833 return DC; 834 } 835 836 return DC->getLexicalParent(); 837} 838 839void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 840 assert(getContainingDC(DC) == CurContext && 841 "The next DeclContext should be lexically contained in the current one."); 842 CurContext = DC; 843 S->setEntity(DC); 844} 845 846void Sema::PopDeclContext() { 847 assert(CurContext && "DeclContext imbalance!"); 848 849 CurContext = getContainingDC(CurContext); 850 assert(CurContext && "Popped translation unit!"); 851} 852 853/// EnterDeclaratorContext - Used when we must lookup names in the context 854/// of a declarator's nested name specifier. 855/// 856void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 857 // C++0x [basic.lookup.unqual]p13: 858 // A name used in the definition of a static data member of class 859 // X (after the qualified-id of the static member) is looked up as 860 // if the name was used in a member function of X. 861 // C++0x [basic.lookup.unqual]p14: 862 // If a variable member of a namespace is defined outside of the 863 // scope of its namespace then any name used in the definition of 864 // the variable member (after the declarator-id) is looked up as 865 // if the definition of the variable member occurred in its 866 // namespace. 867 // Both of these imply that we should push a scope whose context 868 // is the semantic context of the declaration. We can't use 869 // PushDeclContext here because that context is not necessarily 870 // lexically contained in the current context. Fortunately, 871 // the containing scope should have the appropriate information. 872 873 assert(!S->getEntity() && "scope already has entity"); 874 875#ifndef NDEBUG 876 Scope *Ancestor = S->getParent(); 877 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 878 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 879#endif 880 881 CurContext = DC; 882 S->setEntity(DC); 883} 884 885void Sema::ExitDeclaratorContext(Scope *S) { 886 assert(S->getEntity() == CurContext && "Context imbalance!"); 887 888 // Switch back to the lexical context. The safety of this is 889 // enforced by an assert in EnterDeclaratorContext. 890 Scope *Ancestor = S->getParent(); 891 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 892 CurContext = (DeclContext*) Ancestor->getEntity(); 893 894 // We don't need to do anything with the scope, which is going to 895 // disappear. 896} 897 898 899void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 900 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 901 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 902 // We assume that the caller has already called 903 // ActOnReenterTemplateScope 904 FD = TFD->getTemplatedDecl(); 905 } 906 if (!FD) 907 return; 908 909 // Same implementation as PushDeclContext, but enters the context 910 // from the lexical parent, rather than the top-level class. 911 assert(CurContext == FD->getLexicalParent() && 912 "The next DeclContext should be lexically contained in the current one."); 913 CurContext = FD; 914 S->setEntity(CurContext); 915 916 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 917 ParmVarDecl *Param = FD->getParamDecl(P); 918 // If the parameter has an identifier, then add it to the scope 919 if (Param->getIdentifier()) { 920 S->AddDecl(Param); 921 IdResolver.AddDecl(Param); 922 } 923 } 924} 925 926 927void Sema::ActOnExitFunctionContext() { 928 // Same implementation as PopDeclContext, but returns to the lexical parent, 929 // rather than the top-level class. 930 assert(CurContext && "DeclContext imbalance!"); 931 CurContext = CurContext->getLexicalParent(); 932 assert(CurContext && "Popped translation unit!"); 933} 934 935 936/// \brief Determine whether we allow overloading of the function 937/// PrevDecl with another declaration. 938/// 939/// This routine determines whether overloading is possible, not 940/// whether some new function is actually an overload. It will return 941/// true in C++ (where we can always provide overloads) or, as an 942/// extension, in C when the previous function is already an 943/// overloaded function declaration or has the "overloadable" 944/// attribute. 945static bool AllowOverloadingOfFunction(LookupResult &Previous, 946 ASTContext &Context) { 947 if (Context.getLangOpts().CPlusPlus) 948 return true; 949 950 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 951 return true; 952 953 return (Previous.getResultKind() == LookupResult::Found 954 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 955} 956 957/// Add this decl to the scope shadowed decl chains. 958void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 959 // Move up the scope chain until we find the nearest enclosing 960 // non-transparent context. The declaration will be introduced into this 961 // scope. 962 while (S->getEntity() && 963 ((DeclContext *)S->getEntity())->isTransparentContext()) 964 S = S->getParent(); 965 966 // Add scoped declarations into their context, so that they can be 967 // found later. Declarations without a context won't be inserted 968 // into any context. 969 if (AddToContext) 970 CurContext->addDecl(D); 971 972 // Out-of-line definitions shouldn't be pushed into scope in C++. 973 // Out-of-line variable and function definitions shouldn't even in C. 974 if ((getLangOpts().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 975 D->isOutOfLine() && 976 !D->getDeclContext()->getRedeclContext()->Equals( 977 D->getLexicalDeclContext()->getRedeclContext())) 978 return; 979 980 // Template instantiations should also not be pushed into scope. 981 if (isa<FunctionDecl>(D) && 982 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 983 return; 984 985 // If this replaces anything in the current scope, 986 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 987 IEnd = IdResolver.end(); 988 for (; I != IEnd; ++I) { 989 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 990 S->RemoveDecl(*I); 991 IdResolver.RemoveDecl(*I); 992 993 // Should only need to replace one decl. 994 break; 995 } 996 } 997 998 S->AddDecl(D); 999 1000 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 1001 // Implicitly-generated labels may end up getting generated in an order that 1002 // isn't strictly lexical, which breaks name lookup. Be careful to insert 1003 // the label at the appropriate place in the identifier chain. 1004 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 1005 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 1006 if (IDC == CurContext) { 1007 if (!S->isDeclScope(*I)) 1008 continue; 1009 } else if (IDC->Encloses(CurContext)) 1010 break; 1011 } 1012 1013 IdResolver.InsertDeclAfter(I, D); 1014 } else { 1015 IdResolver.AddDecl(D); 1016 } 1017} 1018 1019void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 1020 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 1021 TUScope->AddDecl(D); 1022} 1023 1024bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 1025 bool ExplicitInstantiationOrSpecialization) { 1026 return IdResolver.isDeclInScope(D, Ctx, Context, S, 1027 ExplicitInstantiationOrSpecialization); 1028} 1029 1030Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 1031 DeclContext *TargetDC = DC->getPrimaryContext(); 1032 do { 1033 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 1034 if (ScopeDC->getPrimaryContext() == TargetDC) 1035 return S; 1036 } while ((S = S->getParent())); 1037 1038 return 0; 1039} 1040 1041static bool isOutOfScopePreviousDeclaration(NamedDecl *, 1042 DeclContext*, 1043 ASTContext&); 1044 1045/// Filters out lookup results that don't fall within the given scope 1046/// as determined by isDeclInScope. 1047void Sema::FilterLookupForScope(LookupResult &R, 1048 DeclContext *Ctx, Scope *S, 1049 bool ConsiderLinkage, 1050 bool ExplicitInstantiationOrSpecialization) { 1051 LookupResult::Filter F = R.makeFilter(); 1052 while (F.hasNext()) { 1053 NamedDecl *D = F.next(); 1054 1055 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 1056 continue; 1057 1058 if (ConsiderLinkage && 1059 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 1060 continue; 1061 1062 F.erase(); 1063 } 1064 1065 F.done(); 1066} 1067 1068static bool isUsingDecl(NamedDecl *D) { 1069 return isa<UsingShadowDecl>(D) || 1070 isa<UnresolvedUsingTypenameDecl>(D) || 1071 isa<UnresolvedUsingValueDecl>(D); 1072} 1073 1074/// Removes using shadow declarations from the lookup results. 1075static void RemoveUsingDecls(LookupResult &R) { 1076 LookupResult::Filter F = R.makeFilter(); 1077 while (F.hasNext()) 1078 if (isUsingDecl(F.next())) 1079 F.erase(); 1080 1081 F.done(); 1082} 1083 1084/// \brief Check for this common pattern: 1085/// @code 1086/// class S { 1087/// S(const S&); // DO NOT IMPLEMENT 1088/// void operator=(const S&); // DO NOT IMPLEMENT 1089/// }; 1090/// @endcode 1091static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1092 // FIXME: Should check for private access too but access is set after we get 1093 // the decl here. 1094 if (D->doesThisDeclarationHaveABody()) 1095 return false; 1096 1097 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1098 return CD->isCopyConstructor(); 1099 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1100 return Method->isCopyAssignmentOperator(); 1101 return false; 1102} 1103 1104bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1105 assert(D); 1106 1107 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1108 return false; 1109 1110 // Ignore class templates. 1111 if (D->getDeclContext()->isDependentContext() || 1112 D->getLexicalDeclContext()->isDependentContext()) 1113 return false; 1114 1115 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1116 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1117 return false; 1118 1119 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1120 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1121 return false; 1122 } else { 1123 // 'static inline' functions are used in headers; don't warn. 1124 if (FD->getStorageClass() == SC_Static && 1125 FD->isInlineSpecified()) 1126 return false; 1127 } 1128 1129 if (FD->doesThisDeclarationHaveABody() && 1130 Context.DeclMustBeEmitted(FD)) 1131 return false; 1132 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1133 if (!VD->isFileVarDecl() || 1134 VD->getType().isConstant(Context) || 1135 Context.DeclMustBeEmitted(VD)) 1136 return false; 1137 1138 if (VD->isStaticDataMember() && 1139 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1140 return false; 1141 1142 } else { 1143 return false; 1144 } 1145 1146 // Only warn for unused decls internal to the translation unit. 1147 if (D->getLinkage() == ExternalLinkage) 1148 return false; 1149 1150 return true; 1151} 1152 1153void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1154 if (!D) 1155 return; 1156 1157 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1158 const FunctionDecl *First = FD->getFirstDeclaration(); 1159 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1160 return; // First should already be in the vector. 1161 } 1162 1163 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1164 const VarDecl *First = VD->getFirstDeclaration(); 1165 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1166 return; // First should already be in the vector. 1167 } 1168 1169 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1170 UnusedFileScopedDecls.push_back(D); 1171 } 1172 1173static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1174 if (D->isInvalidDecl()) 1175 return false; 1176 1177 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1178 return false; 1179 1180 if (isa<LabelDecl>(D)) 1181 return true; 1182 1183 // White-list anything that isn't a local variable. 1184 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1185 !D->getDeclContext()->isFunctionOrMethod()) 1186 return false; 1187 1188 // Types of valid local variables should be complete, so this should succeed. 1189 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1190 1191 // White-list anything with an __attribute__((unused)) type. 1192 QualType Ty = VD->getType(); 1193 1194 // Only look at the outermost level of typedef. 1195 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1196 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1197 return false; 1198 } 1199 1200 // If we failed to complete the type for some reason, or if the type is 1201 // dependent, don't diagnose the variable. 1202 if (Ty->isIncompleteType() || Ty->isDependentType()) 1203 return false; 1204 1205 if (const TagType *TT = Ty->getAs<TagType>()) { 1206 const TagDecl *Tag = TT->getDecl(); 1207 if (Tag->hasAttr<UnusedAttr>()) 1208 return false; 1209 1210 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1211 if (!RD->hasTrivialDestructor()) 1212 return false; 1213 1214 if (const Expr *Init = VD->getInit()) { 1215 const CXXConstructExpr *Construct = 1216 dyn_cast<CXXConstructExpr>(Init); 1217 if (Construct && !Construct->isElidable()) { 1218 CXXConstructorDecl *CD = Construct->getConstructor(); 1219 if (!CD->isTrivial()) 1220 return false; 1221 } 1222 } 1223 } 1224 } 1225 1226 // TODO: __attribute__((unused)) templates? 1227 } 1228 1229 return true; 1230} 1231 1232static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1233 FixItHint &Hint) { 1234 if (isa<LabelDecl>(D)) { 1235 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1236 tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), true); 1237 if (AfterColon.isInvalid()) 1238 return; 1239 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1240 getCharRange(D->getLocStart(), AfterColon)); 1241 } 1242 return; 1243} 1244 1245/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1246/// unless they are marked attr(unused). 1247void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1248 FixItHint Hint; 1249 if (!ShouldDiagnoseUnusedDecl(D)) 1250 return; 1251 1252 GenerateFixForUnusedDecl(D, Context, Hint); 1253 1254 unsigned DiagID; 1255 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1256 DiagID = diag::warn_unused_exception_param; 1257 else if (isa<LabelDecl>(D)) 1258 DiagID = diag::warn_unused_label; 1259 else 1260 DiagID = diag::warn_unused_variable; 1261 1262 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1263} 1264 1265static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1266 // Verify that we have no forward references left. If so, there was a goto 1267 // or address of a label taken, but no definition of it. Label fwd 1268 // definitions are indicated with a null substmt. 1269 if (L->getStmt() == 0) 1270 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1271} 1272 1273void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1274 if (S->decl_empty()) return; 1275 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1276 "Scope shouldn't contain decls!"); 1277 1278 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1279 I != E; ++I) { 1280 Decl *TmpD = (*I); 1281 assert(TmpD && "This decl didn't get pushed??"); 1282 1283 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1284 NamedDecl *D = cast<NamedDecl>(TmpD); 1285 1286 if (!D->getDeclName()) continue; 1287 1288 // Diagnose unused variables in this scope. 1289 if (!S->hasErrorOccurred()) 1290 DiagnoseUnusedDecl(D); 1291 1292 // If this was a forward reference to a label, verify it was defined. 1293 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1294 CheckPoppedLabel(LD, *this); 1295 1296 // Remove this name from our lexical scope. 1297 IdResolver.RemoveDecl(D); 1298 } 1299} 1300 1301void Sema::ActOnStartFunctionDeclarator() { 1302 ++InFunctionDeclarator; 1303} 1304 1305void Sema::ActOnEndFunctionDeclarator() { 1306 assert(InFunctionDeclarator); 1307 --InFunctionDeclarator; 1308} 1309 1310/// \brief Look for an Objective-C class in the translation unit. 1311/// 1312/// \param Id The name of the Objective-C class we're looking for. If 1313/// typo-correction fixes this name, the Id will be updated 1314/// to the fixed name. 1315/// 1316/// \param IdLoc The location of the name in the translation unit. 1317/// 1318/// \param TypoCorrection If true, this routine will attempt typo correction 1319/// if there is no class with the given name. 1320/// 1321/// \returns The declaration of the named Objective-C class, or NULL if the 1322/// class could not be found. 1323ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1324 SourceLocation IdLoc, 1325 bool DoTypoCorrection) { 1326 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1327 // creation from this context. 1328 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1329 1330 if (!IDecl && DoTypoCorrection) { 1331 // Perform typo correction at the given location, but only if we 1332 // find an Objective-C class name. 1333 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1334 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1335 LookupOrdinaryName, TUScope, NULL, 1336 Validator)) { 1337 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1338 Diag(IdLoc, diag::err_undef_interface_suggest) 1339 << Id << IDecl->getDeclName() 1340 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1341 Diag(IDecl->getLocation(), diag::note_previous_decl) 1342 << IDecl->getDeclName(); 1343 1344 Id = IDecl->getIdentifier(); 1345 } 1346 } 1347 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1348 // This routine must always return a class definition, if any. 1349 if (Def && Def->getDefinition()) 1350 Def = Def->getDefinition(); 1351 return Def; 1352} 1353 1354/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1355/// from S, where a non-field would be declared. This routine copes 1356/// with the difference between C and C++ scoping rules in structs and 1357/// unions. For example, the following code is well-formed in C but 1358/// ill-formed in C++: 1359/// @code 1360/// struct S6 { 1361/// enum { BAR } e; 1362/// }; 1363/// 1364/// void test_S6() { 1365/// struct S6 a; 1366/// a.e = BAR; 1367/// } 1368/// @endcode 1369/// For the declaration of BAR, this routine will return a different 1370/// scope. The scope S will be the scope of the unnamed enumeration 1371/// within S6. In C++, this routine will return the scope associated 1372/// with S6, because the enumeration's scope is a transparent 1373/// context but structures can contain non-field names. In C, this 1374/// routine will return the translation unit scope, since the 1375/// enumeration's scope is a transparent context and structures cannot 1376/// contain non-field names. 1377Scope *Sema::getNonFieldDeclScope(Scope *S) { 1378 while (((S->getFlags() & Scope::DeclScope) == 0) || 1379 (S->getEntity() && 1380 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1381 (S->isClassScope() && !getLangOpts().CPlusPlus)) 1382 S = S->getParent(); 1383 return S; 1384} 1385 1386/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1387/// file scope. lazily create a decl for it. ForRedeclaration is true 1388/// if we're creating this built-in in anticipation of redeclaring the 1389/// built-in. 1390NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1391 Scope *S, bool ForRedeclaration, 1392 SourceLocation Loc) { 1393 Builtin::ID BID = (Builtin::ID)bid; 1394 1395 ASTContext::GetBuiltinTypeError Error; 1396 QualType R = Context.GetBuiltinType(BID, Error); 1397 switch (Error) { 1398 case ASTContext::GE_None: 1399 // Okay 1400 break; 1401 1402 case ASTContext::GE_Missing_stdio: 1403 if (ForRedeclaration) 1404 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1405 << Context.BuiltinInfo.GetName(BID); 1406 return 0; 1407 1408 case ASTContext::GE_Missing_setjmp: 1409 if (ForRedeclaration) 1410 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1411 << Context.BuiltinInfo.GetName(BID); 1412 return 0; 1413 1414 case ASTContext::GE_Missing_ucontext: 1415 if (ForRedeclaration) 1416 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1417 << Context.BuiltinInfo.GetName(BID); 1418 return 0; 1419 } 1420 1421 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1422 Diag(Loc, diag::ext_implicit_lib_function_decl) 1423 << Context.BuiltinInfo.GetName(BID) 1424 << R; 1425 if (Context.BuiltinInfo.getHeaderName(BID) && 1426 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1427 != DiagnosticsEngine::Ignored) 1428 Diag(Loc, diag::note_please_include_header) 1429 << Context.BuiltinInfo.getHeaderName(BID) 1430 << Context.BuiltinInfo.GetName(BID); 1431 } 1432 1433 FunctionDecl *New = FunctionDecl::Create(Context, 1434 Context.getTranslationUnitDecl(), 1435 Loc, Loc, II, R, /*TInfo=*/0, 1436 SC_Extern, 1437 SC_None, false, 1438 /*hasPrototype=*/true); 1439 New->setImplicit(); 1440 1441 // Create Decl objects for each parameter, adding them to the 1442 // FunctionDecl. 1443 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1444 SmallVector<ParmVarDecl*, 16> Params; 1445 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1446 ParmVarDecl *parm = 1447 ParmVarDecl::Create(Context, New, SourceLocation(), 1448 SourceLocation(), 0, 1449 FT->getArgType(i), /*TInfo=*/0, 1450 SC_None, SC_None, 0); 1451 parm->setScopeInfo(0, i); 1452 Params.push_back(parm); 1453 } 1454 New->setParams(Params); 1455 } 1456 1457 AddKnownFunctionAttributes(New); 1458 1459 // TUScope is the translation-unit scope to insert this function into. 1460 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1461 // relate Scopes to DeclContexts, and probably eliminate CurContext 1462 // entirely, but we're not there yet. 1463 DeclContext *SavedContext = CurContext; 1464 CurContext = Context.getTranslationUnitDecl(); 1465 PushOnScopeChains(New, TUScope); 1466 CurContext = SavedContext; 1467 return New; 1468} 1469 1470bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1471 QualType OldType; 1472 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1473 OldType = OldTypedef->getUnderlyingType(); 1474 else 1475 OldType = Context.getTypeDeclType(Old); 1476 QualType NewType = New->getUnderlyingType(); 1477 1478 if (NewType->isVariablyModifiedType()) { 1479 // Must not redefine a typedef with a variably-modified type. 1480 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1481 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1482 << Kind << NewType; 1483 if (Old->getLocation().isValid()) 1484 Diag(Old->getLocation(), diag::note_previous_definition); 1485 New->setInvalidDecl(); 1486 return true; 1487 } 1488 1489 if (OldType != NewType && 1490 !OldType->isDependentType() && 1491 !NewType->isDependentType() && 1492 !Context.hasSameType(OldType, NewType)) { 1493 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1494 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1495 << Kind << NewType << OldType; 1496 if (Old->getLocation().isValid()) 1497 Diag(Old->getLocation(), diag::note_previous_definition); 1498 New->setInvalidDecl(); 1499 return true; 1500 } 1501 return false; 1502} 1503 1504/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1505/// same name and scope as a previous declaration 'Old'. Figure out 1506/// how to resolve this situation, merging decls or emitting 1507/// diagnostics as appropriate. If there was an error, set New to be invalid. 1508/// 1509void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1510 // If the new decl is known invalid already, don't bother doing any 1511 // merging checks. 1512 if (New->isInvalidDecl()) return; 1513 1514 // Allow multiple definitions for ObjC built-in typedefs. 1515 // FIXME: Verify the underlying types are equivalent! 1516 if (getLangOpts().ObjC1) { 1517 const IdentifierInfo *TypeID = New->getIdentifier(); 1518 switch (TypeID->getLength()) { 1519 default: break; 1520 case 2: 1521 { 1522 if (!TypeID->isStr("id")) 1523 break; 1524 QualType T = New->getUnderlyingType(); 1525 if (!T->isPointerType()) 1526 break; 1527 if (!T->isVoidPointerType()) { 1528 QualType PT = T->getAs<PointerType>()->getPointeeType(); 1529 if (!PT->isStructureType()) 1530 break; 1531 } 1532 Context.setObjCIdRedefinitionType(T); 1533 // Install the built-in type for 'id', ignoring the current definition. 1534 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1535 return; 1536 } 1537 case 5: 1538 if (!TypeID->isStr("Class")) 1539 break; 1540 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1541 // Install the built-in type for 'Class', ignoring the current definition. 1542 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1543 return; 1544 case 3: 1545 if (!TypeID->isStr("SEL")) 1546 break; 1547 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1548 // Install the built-in type for 'SEL', ignoring the current definition. 1549 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1550 return; 1551 } 1552 // Fall through - the typedef name was not a builtin type. 1553 } 1554 1555 // Verify the old decl was also a type. 1556 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1557 if (!Old) { 1558 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1559 << New->getDeclName(); 1560 1561 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1562 if (OldD->getLocation().isValid()) 1563 Diag(OldD->getLocation(), diag::note_previous_definition); 1564 1565 return New->setInvalidDecl(); 1566 } 1567 1568 // If the old declaration is invalid, just give up here. 1569 if (Old->isInvalidDecl()) 1570 return New->setInvalidDecl(); 1571 1572 // If the typedef types are not identical, reject them in all languages and 1573 // with any extensions enabled. 1574 if (isIncompatibleTypedef(Old, New)) 1575 return; 1576 1577 // The types match. Link up the redeclaration chain if the old 1578 // declaration was a typedef. 1579 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1580 New->setPreviousDeclaration(Typedef); 1581 1582 if (getLangOpts().MicrosoftExt) 1583 return; 1584 1585 if (getLangOpts().CPlusPlus) { 1586 // C++ [dcl.typedef]p2: 1587 // In a given non-class scope, a typedef specifier can be used to 1588 // redefine the name of any type declared in that scope to refer 1589 // to the type to which it already refers. 1590 if (!isa<CXXRecordDecl>(CurContext)) 1591 return; 1592 1593 // C++0x [dcl.typedef]p4: 1594 // In a given class scope, a typedef specifier can be used to redefine 1595 // any class-name declared in that scope that is not also a typedef-name 1596 // to refer to the type to which it already refers. 1597 // 1598 // This wording came in via DR424, which was a correction to the 1599 // wording in DR56, which accidentally banned code like: 1600 // 1601 // struct S { 1602 // typedef struct A { } A; 1603 // }; 1604 // 1605 // in the C++03 standard. We implement the C++0x semantics, which 1606 // allow the above but disallow 1607 // 1608 // struct S { 1609 // typedef int I; 1610 // typedef int I; 1611 // }; 1612 // 1613 // since that was the intent of DR56. 1614 if (!isa<TypedefNameDecl>(Old)) 1615 return; 1616 1617 Diag(New->getLocation(), diag::err_redefinition) 1618 << New->getDeclName(); 1619 Diag(Old->getLocation(), diag::note_previous_definition); 1620 return New->setInvalidDecl(); 1621 } 1622 1623 // Modules always permit redefinition of typedefs, as does C11. 1624 if (getLangOpts().Modules || getLangOpts().C11) 1625 return; 1626 1627 // If we have a redefinition of a typedef in C, emit a warning. This warning 1628 // is normally mapped to an error, but can be controlled with 1629 // -Wtypedef-redefinition. If either the original or the redefinition is 1630 // in a system header, don't emit this for compatibility with GCC. 1631 if (getDiagnostics().getSuppressSystemWarnings() && 1632 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1633 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1634 return; 1635 1636 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1637 << New->getDeclName(); 1638 Diag(Old->getLocation(), diag::note_previous_definition); 1639 return; 1640} 1641 1642/// DeclhasAttr - returns true if decl Declaration already has the target 1643/// attribute. 1644static bool 1645DeclHasAttr(const Decl *D, const Attr *A) { 1646 // There can be multiple AvailabilityAttr in a Decl. Make sure we copy 1647 // all of them. It is mergeAvailabilityAttr in SemaDeclAttr.cpp that is 1648 // responsible for making sure they are consistent. 1649 const AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(A); 1650 if (AA) 1651 return false; 1652 1653 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1654 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1655 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1656 if ((*i)->getKind() == A->getKind()) { 1657 if (Ann) { 1658 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1659 return true; 1660 continue; 1661 } 1662 // FIXME: Don't hardcode this check 1663 if (OA && isa<OwnershipAttr>(*i)) 1664 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1665 return true; 1666 } 1667 1668 return false; 1669} 1670 1671bool Sema::mergeDeclAttribute(Decl *D, InheritableAttr *Attr) { 1672 InheritableAttr *NewAttr = NULL; 1673 if (AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(Attr)) 1674 NewAttr = mergeAvailabilityAttr(D, AA->getRange(), AA->getPlatform(), 1675 AA->getIntroduced(), AA->getDeprecated(), 1676 AA->getObsoleted(), AA->getUnavailable(), 1677 AA->getMessage()); 1678 else if (VisibilityAttr *VA = dyn_cast<VisibilityAttr>(Attr)) 1679 NewAttr = mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility()); 1680 else if (DLLImportAttr *ImportA = dyn_cast<DLLImportAttr>(Attr)) 1681 NewAttr = mergeDLLImportAttr(D, ImportA->getRange()); 1682 else if (DLLExportAttr *ExportA = dyn_cast<DLLExportAttr>(Attr)) 1683 NewAttr = mergeDLLExportAttr(D, ExportA->getRange()); 1684 else if (FormatAttr *FA = dyn_cast<FormatAttr>(Attr)) 1685 NewAttr = mergeFormatAttr(D, FA->getRange(), FA->getType(), 1686 FA->getFormatIdx(), FA->getFirstArg()); 1687 else if (SectionAttr *SA = dyn_cast<SectionAttr>(Attr)) 1688 NewAttr = mergeSectionAttr(D, SA->getRange(), SA->getName()); 1689 else if (!DeclHasAttr(D, Attr)) 1690 NewAttr = cast<InheritableAttr>(Attr->clone(Context)); 1691 1692 if (NewAttr) { 1693 NewAttr->setInherited(true); 1694 D->addAttr(NewAttr); 1695 return true; 1696 } 1697 1698 return false; 1699} 1700 1701/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1702void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1703 bool MergeDeprecation) { 1704 if (!Old->hasAttrs()) 1705 return; 1706 1707 bool foundAny = New->hasAttrs(); 1708 1709 // Ensure that any moving of objects within the allocated map is done before 1710 // we process them. 1711 if (!foundAny) New->setAttrs(AttrVec()); 1712 1713 for (specific_attr_iterator<InheritableAttr> 1714 i = Old->specific_attr_begin<InheritableAttr>(), 1715 e = Old->specific_attr_end<InheritableAttr>(); 1716 i != e; ++i) { 1717 // Ignore deprecated/unavailable/availability attributes if requested. 1718 if (!MergeDeprecation && 1719 (isa<DeprecatedAttr>(*i) || 1720 isa<UnavailableAttr>(*i) || 1721 isa<AvailabilityAttr>(*i))) 1722 continue; 1723 1724 if (mergeDeclAttribute(New, *i)) 1725 foundAny = true; 1726 } 1727 1728 if (!foundAny) New->dropAttrs(); 1729} 1730 1731/// mergeParamDeclAttributes - Copy attributes from the old parameter 1732/// to the new one. 1733static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1734 const ParmVarDecl *oldDecl, 1735 ASTContext &C) { 1736 if (!oldDecl->hasAttrs()) 1737 return; 1738 1739 bool foundAny = newDecl->hasAttrs(); 1740 1741 // Ensure that any moving of objects within the allocated map is 1742 // done before we process them. 1743 if (!foundAny) newDecl->setAttrs(AttrVec()); 1744 1745 for (specific_attr_iterator<InheritableParamAttr> 1746 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1747 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1748 if (!DeclHasAttr(newDecl, *i)) { 1749 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1750 newAttr->setInherited(true); 1751 newDecl->addAttr(newAttr); 1752 foundAny = true; 1753 } 1754 } 1755 1756 if (!foundAny) newDecl->dropAttrs(); 1757} 1758 1759namespace { 1760 1761/// Used in MergeFunctionDecl to keep track of function parameters in 1762/// C. 1763struct GNUCompatibleParamWarning { 1764 ParmVarDecl *OldParm; 1765 ParmVarDecl *NewParm; 1766 QualType PromotedType; 1767}; 1768 1769} 1770 1771/// getSpecialMember - get the special member enum for a method. 1772Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1773 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1774 if (Ctor->isDefaultConstructor()) 1775 return Sema::CXXDefaultConstructor; 1776 1777 if (Ctor->isCopyConstructor()) 1778 return Sema::CXXCopyConstructor; 1779 1780 if (Ctor->isMoveConstructor()) 1781 return Sema::CXXMoveConstructor; 1782 } else if (isa<CXXDestructorDecl>(MD)) { 1783 return Sema::CXXDestructor; 1784 } else if (MD->isCopyAssignmentOperator()) { 1785 return Sema::CXXCopyAssignment; 1786 } else if (MD->isMoveAssignmentOperator()) { 1787 return Sema::CXXMoveAssignment; 1788 } 1789 1790 return Sema::CXXInvalid; 1791} 1792 1793/// canRedefineFunction - checks if a function can be redefined. Currently, 1794/// only extern inline functions can be redefined, and even then only in 1795/// GNU89 mode. 1796static bool canRedefineFunction(const FunctionDecl *FD, 1797 const LangOptions& LangOpts) { 1798 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1799 !LangOpts.CPlusPlus && 1800 FD->isInlineSpecified() && 1801 FD->getStorageClass() == SC_Extern); 1802} 1803 1804/// MergeFunctionDecl - We just parsed a function 'New' from 1805/// declarator D which has the same name and scope as a previous 1806/// declaration 'Old'. Figure out how to resolve this situation, 1807/// merging decls or emitting diagnostics as appropriate. 1808/// 1809/// In C++, New and Old must be declarations that are not 1810/// overloaded. Use IsOverload to determine whether New and Old are 1811/// overloaded, and to select the Old declaration that New should be 1812/// merged with. 1813/// 1814/// Returns true if there was an error, false otherwise. 1815bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) { 1816 // Verify the old decl was also a function. 1817 FunctionDecl *Old = 0; 1818 if (FunctionTemplateDecl *OldFunctionTemplate 1819 = dyn_cast<FunctionTemplateDecl>(OldD)) 1820 Old = OldFunctionTemplate->getTemplatedDecl(); 1821 else 1822 Old = dyn_cast<FunctionDecl>(OldD); 1823 if (!Old) { 1824 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1825 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1826 Diag(Shadow->getTargetDecl()->getLocation(), 1827 diag::note_using_decl_target); 1828 Diag(Shadow->getUsingDecl()->getLocation(), 1829 diag::note_using_decl) << 0; 1830 return true; 1831 } 1832 1833 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1834 << New->getDeclName(); 1835 Diag(OldD->getLocation(), diag::note_previous_definition); 1836 return true; 1837 } 1838 1839 // Determine whether the previous declaration was a definition, 1840 // implicit declaration, or a declaration. 1841 diag::kind PrevDiag; 1842 if (Old->isThisDeclarationADefinition()) 1843 PrevDiag = diag::note_previous_definition; 1844 else if (Old->isImplicit()) 1845 PrevDiag = diag::note_previous_implicit_declaration; 1846 else 1847 PrevDiag = diag::note_previous_declaration; 1848 1849 QualType OldQType = Context.getCanonicalType(Old->getType()); 1850 QualType NewQType = Context.getCanonicalType(New->getType()); 1851 1852 // Don't complain about this if we're in GNU89 mode and the old function 1853 // is an extern inline function. 1854 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1855 New->getStorageClass() == SC_Static && 1856 Old->getStorageClass() != SC_Static && 1857 !canRedefineFunction(Old, getLangOpts())) { 1858 if (getLangOpts().MicrosoftExt) { 1859 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1860 Diag(Old->getLocation(), PrevDiag); 1861 } else { 1862 Diag(New->getLocation(), diag::err_static_non_static) << New; 1863 Diag(Old->getLocation(), PrevDiag); 1864 return true; 1865 } 1866 } 1867 1868 // If a function is first declared with a calling convention, but is 1869 // later declared or defined without one, the second decl assumes the 1870 // calling convention of the first. 1871 // 1872 // For the new decl, we have to look at the NON-canonical type to tell the 1873 // difference between a function that really doesn't have a calling 1874 // convention and one that is declared cdecl. That's because in 1875 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1876 // because it is the default calling convention. 1877 // 1878 // Note also that we DO NOT return at this point, because we still have 1879 // other tests to run. 1880 const FunctionType *OldType = cast<FunctionType>(OldQType); 1881 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1882 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1883 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1884 bool RequiresAdjustment = false; 1885 if (OldTypeInfo.getCC() != CC_Default && 1886 NewTypeInfo.getCC() == CC_Default) { 1887 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1888 RequiresAdjustment = true; 1889 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1890 NewTypeInfo.getCC())) { 1891 // Calling conventions really aren't compatible, so complain. 1892 Diag(New->getLocation(), diag::err_cconv_change) 1893 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1894 << (OldTypeInfo.getCC() == CC_Default) 1895 << (OldTypeInfo.getCC() == CC_Default ? "" : 1896 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1897 Diag(Old->getLocation(), diag::note_previous_declaration); 1898 return true; 1899 } 1900 1901 // FIXME: diagnose the other way around? 1902 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1903 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1904 RequiresAdjustment = true; 1905 } 1906 1907 // Merge regparm attribute. 1908 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1909 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1910 if (NewTypeInfo.getHasRegParm()) { 1911 Diag(New->getLocation(), diag::err_regparm_mismatch) 1912 << NewType->getRegParmType() 1913 << OldType->getRegParmType(); 1914 Diag(Old->getLocation(), diag::note_previous_declaration); 1915 return true; 1916 } 1917 1918 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1919 RequiresAdjustment = true; 1920 } 1921 1922 // Merge ns_returns_retained attribute. 1923 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1924 if (NewTypeInfo.getProducesResult()) { 1925 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1926 Diag(Old->getLocation(), diag::note_previous_declaration); 1927 return true; 1928 } 1929 1930 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1931 RequiresAdjustment = true; 1932 } 1933 1934 if (RequiresAdjustment) { 1935 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1936 New->setType(QualType(NewType, 0)); 1937 NewQType = Context.getCanonicalType(New->getType()); 1938 } 1939 1940 if (getLangOpts().CPlusPlus) { 1941 // (C++98 13.1p2): 1942 // Certain function declarations cannot be overloaded: 1943 // -- Function declarations that differ only in the return type 1944 // cannot be overloaded. 1945 QualType OldReturnType = OldType->getResultType(); 1946 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1947 QualType ResQT; 1948 if (OldReturnType != NewReturnType) { 1949 if (NewReturnType->isObjCObjectPointerType() 1950 && OldReturnType->isObjCObjectPointerType()) 1951 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1952 if (ResQT.isNull()) { 1953 if (New->isCXXClassMember() && New->isOutOfLine()) 1954 Diag(New->getLocation(), 1955 diag::err_member_def_does_not_match_ret_type) << New; 1956 else 1957 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1958 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1959 return true; 1960 } 1961 else 1962 NewQType = ResQT; 1963 } 1964 1965 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1966 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1967 if (OldMethod && NewMethod) { 1968 // Preserve triviality. 1969 NewMethod->setTrivial(OldMethod->isTrivial()); 1970 1971 // MSVC allows explicit template specialization at class scope: 1972 // 2 CXMethodDecls referring to the same function will be injected. 1973 // We don't want a redeclartion error. 1974 bool IsClassScopeExplicitSpecialization = 1975 OldMethod->isFunctionTemplateSpecialization() && 1976 NewMethod->isFunctionTemplateSpecialization(); 1977 bool isFriend = NewMethod->getFriendObjectKind(); 1978 1979 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1980 !IsClassScopeExplicitSpecialization) { 1981 // -- Member function declarations with the same name and the 1982 // same parameter types cannot be overloaded if any of them 1983 // is a static member function declaration. 1984 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1985 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1986 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1987 return true; 1988 } 1989 1990 // C++ [class.mem]p1: 1991 // [...] A member shall not be declared twice in the 1992 // member-specification, except that a nested class or member 1993 // class template can be declared and then later defined. 1994 unsigned NewDiag; 1995 if (isa<CXXConstructorDecl>(OldMethod)) 1996 NewDiag = diag::err_constructor_redeclared; 1997 else if (isa<CXXDestructorDecl>(NewMethod)) 1998 NewDiag = diag::err_destructor_redeclared; 1999 else if (isa<CXXConversionDecl>(NewMethod)) 2000 NewDiag = diag::err_conv_function_redeclared; 2001 else 2002 NewDiag = diag::err_member_redeclared; 2003 2004 Diag(New->getLocation(), NewDiag); 2005 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2006 2007 // Complain if this is an explicit declaration of a special 2008 // member that was initially declared implicitly. 2009 // 2010 // As an exception, it's okay to befriend such methods in order 2011 // to permit the implicit constructor/destructor/operator calls. 2012 } else if (OldMethod->isImplicit()) { 2013 if (isFriend) { 2014 NewMethod->setImplicit(); 2015 } else { 2016 Diag(NewMethod->getLocation(), 2017 diag::err_definition_of_implicitly_declared_member) 2018 << New << getSpecialMember(OldMethod); 2019 return true; 2020 } 2021 } else if (OldMethod->isExplicitlyDefaulted()) { 2022 Diag(NewMethod->getLocation(), 2023 diag::err_definition_of_explicitly_defaulted_member) 2024 << getSpecialMember(OldMethod); 2025 return true; 2026 } 2027 } 2028 2029 // (C++98 8.3.5p3): 2030 // All declarations for a function shall agree exactly in both the 2031 // return type and the parameter-type-list. 2032 // We also want to respect all the extended bits except noreturn. 2033 2034 // noreturn should now match unless the old type info didn't have it. 2035 QualType OldQTypeForComparison = OldQType; 2036 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 2037 assert(OldQType == QualType(OldType, 0)); 2038 const FunctionType *OldTypeForComparison 2039 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 2040 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 2041 assert(OldQTypeForComparison.isCanonical()); 2042 } 2043 2044 if (OldQTypeForComparison == NewQType) 2045 return MergeCompatibleFunctionDecls(New, Old, S); 2046 2047 // Fall through for conflicting redeclarations and redefinitions. 2048 } 2049 2050 // C: Function types need to be compatible, not identical. This handles 2051 // duplicate function decls like "void f(int); void f(enum X);" properly. 2052 if (!getLangOpts().CPlusPlus && 2053 Context.typesAreCompatible(OldQType, NewQType)) { 2054 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 2055 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 2056 const FunctionProtoType *OldProto = 0; 2057 if (isa<FunctionNoProtoType>(NewFuncType) && 2058 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 2059 // The old declaration provided a function prototype, but the 2060 // new declaration does not. Merge in the prototype. 2061 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 2062 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 2063 OldProto->arg_type_end()); 2064 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 2065 ParamTypes.data(), ParamTypes.size(), 2066 OldProto->getExtProtoInfo()); 2067 New->setType(NewQType); 2068 New->setHasInheritedPrototype(); 2069 2070 // Synthesize a parameter for each argument type. 2071 SmallVector<ParmVarDecl*, 16> Params; 2072 for (FunctionProtoType::arg_type_iterator 2073 ParamType = OldProto->arg_type_begin(), 2074 ParamEnd = OldProto->arg_type_end(); 2075 ParamType != ParamEnd; ++ParamType) { 2076 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 2077 SourceLocation(), 2078 SourceLocation(), 0, 2079 *ParamType, /*TInfo=*/0, 2080 SC_None, SC_None, 2081 0); 2082 Param->setScopeInfo(0, Params.size()); 2083 Param->setImplicit(); 2084 Params.push_back(Param); 2085 } 2086 2087 New->setParams(Params); 2088 } 2089 2090 return MergeCompatibleFunctionDecls(New, Old, S); 2091 } 2092 2093 // GNU C permits a K&R definition to follow a prototype declaration 2094 // if the declared types of the parameters in the K&R definition 2095 // match the types in the prototype declaration, even when the 2096 // promoted types of the parameters from the K&R definition differ 2097 // from the types in the prototype. GCC then keeps the types from 2098 // the prototype. 2099 // 2100 // If a variadic prototype is followed by a non-variadic K&R definition, 2101 // the K&R definition becomes variadic. This is sort of an edge case, but 2102 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2103 // C99 6.9.1p8. 2104 if (!getLangOpts().CPlusPlus && 2105 Old->hasPrototype() && !New->hasPrototype() && 2106 New->getType()->getAs<FunctionProtoType>() && 2107 Old->getNumParams() == New->getNumParams()) { 2108 SmallVector<QualType, 16> ArgTypes; 2109 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2110 const FunctionProtoType *OldProto 2111 = Old->getType()->getAs<FunctionProtoType>(); 2112 const FunctionProtoType *NewProto 2113 = New->getType()->getAs<FunctionProtoType>(); 2114 2115 // Determine whether this is the GNU C extension. 2116 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2117 NewProto->getResultType()); 2118 bool LooseCompatible = !MergedReturn.isNull(); 2119 for (unsigned Idx = 0, End = Old->getNumParams(); 2120 LooseCompatible && Idx != End; ++Idx) { 2121 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2122 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2123 if (Context.typesAreCompatible(OldParm->getType(), 2124 NewProto->getArgType(Idx))) { 2125 ArgTypes.push_back(NewParm->getType()); 2126 } else if (Context.typesAreCompatible(OldParm->getType(), 2127 NewParm->getType(), 2128 /*CompareUnqualified=*/true)) { 2129 GNUCompatibleParamWarning Warn 2130 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2131 Warnings.push_back(Warn); 2132 ArgTypes.push_back(NewParm->getType()); 2133 } else 2134 LooseCompatible = false; 2135 } 2136 2137 if (LooseCompatible) { 2138 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2139 Diag(Warnings[Warn].NewParm->getLocation(), 2140 diag::ext_param_promoted_not_compatible_with_prototype) 2141 << Warnings[Warn].PromotedType 2142 << Warnings[Warn].OldParm->getType(); 2143 if (Warnings[Warn].OldParm->getLocation().isValid()) 2144 Diag(Warnings[Warn].OldParm->getLocation(), 2145 diag::note_previous_declaration); 2146 } 2147 2148 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2149 ArgTypes.size(), 2150 OldProto->getExtProtoInfo())); 2151 return MergeCompatibleFunctionDecls(New, Old, S); 2152 } 2153 2154 // Fall through to diagnose conflicting types. 2155 } 2156 2157 // A function that has already been declared has been redeclared or defined 2158 // with a different type- show appropriate diagnostic 2159 if (unsigned BuiltinID = Old->getBuiltinID()) { 2160 // The user has declared a builtin function with an incompatible 2161 // signature. 2162 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2163 // The function the user is redeclaring is a library-defined 2164 // function like 'malloc' or 'printf'. Warn about the 2165 // redeclaration, then pretend that we don't know about this 2166 // library built-in. 2167 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2168 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2169 << Old << Old->getType(); 2170 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2171 Old->setInvalidDecl(); 2172 return false; 2173 } 2174 2175 PrevDiag = diag::note_previous_builtin_declaration; 2176 } 2177 2178 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2179 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2180 return true; 2181} 2182 2183/// \brief Completes the merge of two function declarations that are 2184/// known to be compatible. 2185/// 2186/// This routine handles the merging of attributes and other 2187/// properties of function declarations form the old declaration to 2188/// the new declaration, once we know that New is in fact a 2189/// redeclaration of Old. 2190/// 2191/// \returns false 2192bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old, 2193 Scope *S) { 2194 // Merge the attributes 2195 mergeDeclAttributes(New, Old); 2196 2197 // Merge the storage class. 2198 if (Old->getStorageClass() != SC_Extern && 2199 Old->getStorageClass() != SC_None) 2200 New->setStorageClass(Old->getStorageClass()); 2201 2202 // Merge "pure" flag. 2203 if (Old->isPure()) 2204 New->setPure(); 2205 2206 // Merge attributes from the parameters. These can mismatch with K&R 2207 // declarations. 2208 if (New->getNumParams() == Old->getNumParams()) 2209 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2210 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2211 Context); 2212 2213 if (getLangOpts().CPlusPlus) 2214 return MergeCXXFunctionDecl(New, Old, S); 2215 2216 return false; 2217} 2218 2219 2220void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2221 ObjCMethodDecl *oldMethod) { 2222 // We don't want to merge unavailable and deprecated attributes 2223 // except from interface to implementation. 2224 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2225 2226 // Merge the attributes. 2227 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2228 2229 // Merge attributes from the parameters. 2230 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2231 for (ObjCMethodDecl::param_iterator 2232 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2233 ni != ne; ++ni, ++oi) 2234 mergeParamDeclAttributes(*ni, *oi, Context); 2235 2236 CheckObjCMethodOverride(newMethod, oldMethod, true); 2237} 2238 2239/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2240/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2241/// emitting diagnostics as appropriate. 2242/// 2243/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2244/// to here in AddInitializerToDecl. We can't check them before the initializer 2245/// is attached. 2246void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2247 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2248 return; 2249 2250 QualType MergedT; 2251 if (getLangOpts().CPlusPlus) { 2252 AutoType *AT = New->getType()->getContainedAutoType(); 2253 if (AT && !AT->isDeduced()) { 2254 // We don't know what the new type is until the initializer is attached. 2255 return; 2256 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2257 // These could still be something that needs exception specs checked. 2258 return MergeVarDeclExceptionSpecs(New, Old); 2259 } 2260 // C++ [basic.link]p10: 2261 // [...] the types specified by all declarations referring to a given 2262 // object or function shall be identical, except that declarations for an 2263 // array object can specify array types that differ by the presence or 2264 // absence of a major array bound (8.3.4). 2265 else if (Old->getType()->isIncompleteArrayType() && 2266 New->getType()->isArrayType()) { 2267 CanQual<ArrayType> OldArray 2268 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2269 CanQual<ArrayType> NewArray 2270 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2271 if (OldArray->getElementType() == NewArray->getElementType()) 2272 MergedT = New->getType(); 2273 } else if (Old->getType()->isArrayType() && 2274 New->getType()->isIncompleteArrayType()) { 2275 CanQual<ArrayType> OldArray 2276 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2277 CanQual<ArrayType> NewArray 2278 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2279 if (OldArray->getElementType() == NewArray->getElementType()) 2280 MergedT = Old->getType(); 2281 } else if (New->getType()->isObjCObjectPointerType() 2282 && Old->getType()->isObjCObjectPointerType()) { 2283 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2284 Old->getType()); 2285 } 2286 } else { 2287 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2288 } 2289 if (MergedT.isNull()) { 2290 Diag(New->getLocation(), diag::err_redefinition_different_type) 2291 << New->getDeclName(); 2292 Diag(Old->getLocation(), diag::note_previous_definition); 2293 return New->setInvalidDecl(); 2294 } 2295 New->setType(MergedT); 2296} 2297 2298/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2299/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2300/// situation, merging decls or emitting diagnostics as appropriate. 2301/// 2302/// Tentative definition rules (C99 6.9.2p2) are checked by 2303/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2304/// definitions here, since the initializer hasn't been attached. 2305/// 2306void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2307 // If the new decl is already invalid, don't do any other checking. 2308 if (New->isInvalidDecl()) 2309 return; 2310 2311 // Verify the old decl was also a variable. 2312 VarDecl *Old = 0; 2313 if (!Previous.isSingleResult() || 2314 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2315 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2316 << New->getDeclName(); 2317 Diag(Previous.getRepresentativeDecl()->getLocation(), 2318 diag::note_previous_definition); 2319 return New->setInvalidDecl(); 2320 } 2321 2322 // C++ [class.mem]p1: 2323 // A member shall not be declared twice in the member-specification [...] 2324 // 2325 // Here, we need only consider static data members. 2326 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2327 Diag(New->getLocation(), diag::err_duplicate_member) 2328 << New->getIdentifier(); 2329 Diag(Old->getLocation(), diag::note_previous_declaration); 2330 New->setInvalidDecl(); 2331 } 2332 2333 mergeDeclAttributes(New, Old); 2334 // Warn if an already-declared variable is made a weak_import in a subsequent 2335 // declaration 2336 if (New->getAttr<WeakImportAttr>() && 2337 Old->getStorageClass() == SC_None && 2338 !Old->getAttr<WeakImportAttr>()) { 2339 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2340 Diag(Old->getLocation(), diag::note_previous_definition); 2341 // Remove weak_import attribute on new declaration. 2342 New->dropAttr<WeakImportAttr>(); 2343 } 2344 2345 // Merge the types. 2346 MergeVarDeclTypes(New, Old); 2347 if (New->isInvalidDecl()) 2348 return; 2349 2350 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2351 if (New->getStorageClass() == SC_Static && 2352 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2353 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2354 Diag(Old->getLocation(), diag::note_previous_definition); 2355 return New->setInvalidDecl(); 2356 } 2357 // C99 6.2.2p4: 2358 // For an identifier declared with the storage-class specifier 2359 // extern in a scope in which a prior declaration of that 2360 // identifier is visible,23) if the prior declaration specifies 2361 // internal or external linkage, the linkage of the identifier at 2362 // the later declaration is the same as the linkage specified at 2363 // the prior declaration. If no prior declaration is visible, or 2364 // if the prior declaration specifies no linkage, then the 2365 // identifier has external linkage. 2366 if (New->hasExternalStorage() && Old->hasLinkage()) 2367 /* Okay */; 2368 else if (New->getStorageClass() != SC_Static && 2369 Old->getStorageClass() == SC_Static) { 2370 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2371 Diag(Old->getLocation(), diag::note_previous_definition); 2372 return New->setInvalidDecl(); 2373 } 2374 2375 // Check if extern is followed by non-extern and vice-versa. 2376 if (New->hasExternalStorage() && 2377 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2378 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2379 Diag(Old->getLocation(), diag::note_previous_definition); 2380 return New->setInvalidDecl(); 2381 } 2382 if (Old->hasExternalStorage() && 2383 !New->hasLinkage() && New->isLocalVarDecl()) { 2384 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2385 Diag(Old->getLocation(), diag::note_previous_definition); 2386 return New->setInvalidDecl(); 2387 } 2388 2389 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2390 2391 // FIXME: The test for external storage here seems wrong? We still 2392 // need to check for mismatches. 2393 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2394 // Don't complain about out-of-line definitions of static members. 2395 !(Old->getLexicalDeclContext()->isRecord() && 2396 !New->getLexicalDeclContext()->isRecord())) { 2397 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2398 Diag(Old->getLocation(), diag::note_previous_definition); 2399 return New->setInvalidDecl(); 2400 } 2401 2402 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2403 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2404 Diag(Old->getLocation(), diag::note_previous_definition); 2405 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2406 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2407 Diag(Old->getLocation(), diag::note_previous_definition); 2408 } 2409 2410 // C++ doesn't have tentative definitions, so go right ahead and check here. 2411 const VarDecl *Def; 2412 if (getLangOpts().CPlusPlus && 2413 New->isThisDeclarationADefinition() == VarDecl::Definition && 2414 (Def = Old->getDefinition())) { 2415 Diag(New->getLocation(), diag::err_redefinition) 2416 << New->getDeclName(); 2417 Diag(Def->getLocation(), diag::note_previous_definition); 2418 New->setInvalidDecl(); 2419 return; 2420 } 2421 // c99 6.2.2 P4. 2422 // For an identifier declared with the storage-class specifier extern in a 2423 // scope in which a prior declaration of that identifier is visible, if 2424 // the prior declaration specifies internal or external linkage, the linkage 2425 // of the identifier at the later declaration is the same as the linkage 2426 // specified at the prior declaration. 2427 // FIXME. revisit this code. 2428 if (New->hasExternalStorage() && 2429 Old->getLinkage() == InternalLinkage && 2430 New->getDeclContext() == Old->getDeclContext()) 2431 New->setStorageClass(Old->getStorageClass()); 2432 2433 // Keep a chain of previous declarations. 2434 New->setPreviousDeclaration(Old); 2435 2436 // Inherit access appropriately. 2437 New->setAccess(Old->getAccess()); 2438} 2439 2440/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2441/// no declarator (e.g. "struct foo;") is parsed. 2442Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2443 DeclSpec &DS) { 2444 return ParsedFreeStandingDeclSpec(S, AS, DS, 2445 MultiTemplateParamsArg(*this, 0, 0)); 2446} 2447 2448/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2449/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2450/// parameters to cope with template friend declarations. 2451Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2452 DeclSpec &DS, 2453 MultiTemplateParamsArg TemplateParams) { 2454 Decl *TagD = 0; 2455 TagDecl *Tag = 0; 2456 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2457 DS.getTypeSpecType() == DeclSpec::TST_struct || 2458 DS.getTypeSpecType() == DeclSpec::TST_union || 2459 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2460 TagD = DS.getRepAsDecl(); 2461 2462 if (!TagD) // We probably had an error 2463 return 0; 2464 2465 // Note that the above type specs guarantee that the 2466 // type rep is a Decl, whereas in many of the others 2467 // it's a Type. 2468 if (isa<TagDecl>(TagD)) 2469 Tag = cast<TagDecl>(TagD); 2470 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2471 Tag = CTD->getTemplatedDecl(); 2472 } 2473 2474 if (Tag) { 2475 Tag->setFreeStanding(); 2476 if (Tag->isInvalidDecl()) 2477 return Tag; 2478 } 2479 2480 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2481 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2482 // or incomplete types shall not be restrict-qualified." 2483 if (TypeQuals & DeclSpec::TQ_restrict) 2484 Diag(DS.getRestrictSpecLoc(), 2485 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2486 << DS.getSourceRange(); 2487 } 2488 2489 if (DS.isConstexprSpecified()) { 2490 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2491 // and definitions of functions and variables. 2492 if (Tag) 2493 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2494 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2495 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2496 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2497 else 2498 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2499 // Don't emit warnings after this error. 2500 return TagD; 2501 } 2502 2503 if (DS.isFriendSpecified()) { 2504 // If we're dealing with a decl but not a TagDecl, assume that 2505 // whatever routines created it handled the friendship aspect. 2506 if (TagD && !Tag) 2507 return 0; 2508 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2509 } 2510 2511 // Track whether we warned about the fact that there aren't any 2512 // declarators. 2513 bool emittedWarning = false; 2514 2515 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2516 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2517 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2518 if (getLangOpts().CPlusPlus || 2519 Record->getDeclContext()->isRecord()) 2520 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2521 2522 Diag(DS.getLocStart(), diag::ext_no_declarators) 2523 << DS.getSourceRange(); 2524 emittedWarning = true; 2525 } 2526 } 2527 2528 // Check for Microsoft C extension: anonymous struct. 2529 if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus && 2530 CurContext->isRecord() && 2531 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2532 // Handle 2 kinds of anonymous struct: 2533 // struct STRUCT; 2534 // and 2535 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2536 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2537 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2538 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2539 DS.getRepAsType().get()->isStructureType())) { 2540 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct) 2541 << DS.getSourceRange(); 2542 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2543 } 2544 } 2545 2546 if (getLangOpts().CPlusPlus && 2547 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2548 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2549 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2550 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2551 Diag(Enum->getLocation(), diag::ext_no_declarators) 2552 << DS.getSourceRange(); 2553 emittedWarning = true; 2554 } 2555 2556 // Skip all the checks below if we have a type error. 2557 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2558 2559 if (!DS.isMissingDeclaratorOk()) { 2560 // Warn about typedefs of enums without names, since this is an 2561 // extension in both Microsoft and GNU. 2562 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2563 Tag && isa<EnumDecl>(Tag)) { 2564 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name) 2565 << DS.getSourceRange(); 2566 return Tag; 2567 } 2568 2569 Diag(DS.getLocStart(), diag::ext_no_declarators) 2570 << DS.getSourceRange(); 2571 emittedWarning = true; 2572 } 2573 2574 // We're going to complain about a bunch of spurious specifiers; 2575 // only do this if we're declaring a tag, because otherwise we 2576 // should be getting diag::ext_no_declarators. 2577 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2578 return TagD; 2579 2580 // Note that a linkage-specification sets a storage class, but 2581 // 'extern "C" struct foo;' is actually valid and not theoretically 2582 // useless. 2583 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2584 if (!DS.isExternInLinkageSpec()) 2585 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2586 << DeclSpec::getSpecifierName(scs); 2587 2588 if (DS.isThreadSpecified()) 2589 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2590 if (DS.getTypeQualifiers()) { 2591 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2592 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2593 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2594 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2595 // Restrict is covered above. 2596 } 2597 if (DS.isInlineSpecified()) 2598 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2599 if (DS.isVirtualSpecified()) 2600 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2601 if (DS.isExplicitSpecified()) 2602 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2603 2604 if (DS.isModulePrivateSpecified() && 2605 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2606 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2607 << Tag->getTagKind() 2608 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2609 2610 // Warn about ignored type attributes, for example: 2611 // __attribute__((aligned)) struct A; 2612 // Attributes should be placed after tag to apply to type declaration. 2613 if (!DS.getAttributes().empty()) { 2614 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2615 if (TypeSpecType == DeclSpec::TST_class || 2616 TypeSpecType == DeclSpec::TST_struct || 2617 TypeSpecType == DeclSpec::TST_union || 2618 TypeSpecType == DeclSpec::TST_enum) { 2619 AttributeList* attrs = DS.getAttributes().getList(); 2620 while (attrs) { 2621 Diag(attrs->getScopeLoc(), 2622 diag::warn_declspec_attribute_ignored) 2623 << attrs->getName() 2624 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2625 TypeSpecType == DeclSpec::TST_struct ? 1 : 2626 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2627 attrs = attrs->getNext(); 2628 } 2629 } 2630 } 2631 2632 return TagD; 2633} 2634 2635/// We are trying to inject an anonymous member into the given scope; 2636/// check if there's an existing declaration that can't be overloaded. 2637/// 2638/// \return true if this is a forbidden redeclaration 2639static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2640 Scope *S, 2641 DeclContext *Owner, 2642 DeclarationName Name, 2643 SourceLocation NameLoc, 2644 unsigned diagnostic) { 2645 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2646 Sema::ForRedeclaration); 2647 if (!SemaRef.LookupName(R, S)) return false; 2648 2649 if (R.getAsSingle<TagDecl>()) 2650 return false; 2651 2652 // Pick a representative declaration. 2653 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2654 assert(PrevDecl && "Expected a non-null Decl"); 2655 2656 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2657 return false; 2658 2659 SemaRef.Diag(NameLoc, diagnostic) << Name; 2660 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2661 2662 return true; 2663} 2664 2665/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2666/// anonymous struct or union AnonRecord into the owning context Owner 2667/// and scope S. This routine will be invoked just after we realize 2668/// that an unnamed union or struct is actually an anonymous union or 2669/// struct, e.g., 2670/// 2671/// @code 2672/// union { 2673/// int i; 2674/// float f; 2675/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2676/// // f into the surrounding scope.x 2677/// @endcode 2678/// 2679/// This routine is recursive, injecting the names of nested anonymous 2680/// structs/unions into the owning context and scope as well. 2681static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2682 DeclContext *Owner, 2683 RecordDecl *AnonRecord, 2684 AccessSpecifier AS, 2685 SmallVector<NamedDecl*, 2> &Chaining, 2686 bool MSAnonStruct) { 2687 unsigned diagKind 2688 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2689 : diag::err_anonymous_struct_member_redecl; 2690 2691 bool Invalid = false; 2692 2693 // Look every FieldDecl and IndirectFieldDecl with a name. 2694 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2695 DEnd = AnonRecord->decls_end(); 2696 D != DEnd; ++D) { 2697 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2698 cast<NamedDecl>(*D)->getDeclName()) { 2699 ValueDecl *VD = cast<ValueDecl>(*D); 2700 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2701 VD->getLocation(), diagKind)) { 2702 // C++ [class.union]p2: 2703 // The names of the members of an anonymous union shall be 2704 // distinct from the names of any other entity in the 2705 // scope in which the anonymous union is declared. 2706 Invalid = true; 2707 } else { 2708 // C++ [class.union]p2: 2709 // For the purpose of name lookup, after the anonymous union 2710 // definition, the members of the anonymous union are 2711 // considered to have been defined in the scope in which the 2712 // anonymous union is declared. 2713 unsigned OldChainingSize = Chaining.size(); 2714 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2715 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2716 PE = IF->chain_end(); PI != PE; ++PI) 2717 Chaining.push_back(*PI); 2718 else 2719 Chaining.push_back(VD); 2720 2721 assert(Chaining.size() >= 2); 2722 NamedDecl **NamedChain = 2723 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2724 for (unsigned i = 0; i < Chaining.size(); i++) 2725 NamedChain[i] = Chaining[i]; 2726 2727 IndirectFieldDecl* IndirectField = 2728 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2729 VD->getIdentifier(), VD->getType(), 2730 NamedChain, Chaining.size()); 2731 2732 IndirectField->setAccess(AS); 2733 IndirectField->setImplicit(); 2734 SemaRef.PushOnScopeChains(IndirectField, S); 2735 2736 // That includes picking up the appropriate access specifier. 2737 if (AS != AS_none) IndirectField->setAccess(AS); 2738 2739 Chaining.resize(OldChainingSize); 2740 } 2741 } 2742 } 2743 2744 return Invalid; 2745} 2746 2747/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2748/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2749/// illegal input values are mapped to SC_None. 2750static StorageClass 2751StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2752 switch (StorageClassSpec) { 2753 case DeclSpec::SCS_unspecified: return SC_None; 2754 case DeclSpec::SCS_extern: return SC_Extern; 2755 case DeclSpec::SCS_static: return SC_Static; 2756 case DeclSpec::SCS_auto: return SC_Auto; 2757 case DeclSpec::SCS_register: return SC_Register; 2758 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2759 // Illegal SCSs map to None: error reporting is up to the caller. 2760 case DeclSpec::SCS_mutable: // Fall through. 2761 case DeclSpec::SCS_typedef: return SC_None; 2762 } 2763 llvm_unreachable("unknown storage class specifier"); 2764} 2765 2766/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2767/// a StorageClass. Any error reporting is up to the caller: 2768/// illegal input values are mapped to SC_None. 2769static StorageClass 2770StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2771 switch (StorageClassSpec) { 2772 case DeclSpec::SCS_unspecified: return SC_None; 2773 case DeclSpec::SCS_extern: return SC_Extern; 2774 case DeclSpec::SCS_static: return SC_Static; 2775 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2776 // Illegal SCSs map to None: error reporting is up to the caller. 2777 case DeclSpec::SCS_auto: // Fall through. 2778 case DeclSpec::SCS_mutable: // Fall through. 2779 case DeclSpec::SCS_register: // Fall through. 2780 case DeclSpec::SCS_typedef: return SC_None; 2781 } 2782 llvm_unreachable("unknown storage class specifier"); 2783} 2784 2785/// BuildAnonymousStructOrUnion - Handle the declaration of an 2786/// anonymous structure or union. Anonymous unions are a C++ feature 2787/// (C++ [class.union]) and a C11 feature; anonymous structures 2788/// are a C11 feature and GNU C++ extension. 2789Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2790 AccessSpecifier AS, 2791 RecordDecl *Record) { 2792 DeclContext *Owner = Record->getDeclContext(); 2793 2794 // Diagnose whether this anonymous struct/union is an extension. 2795 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11) 2796 Diag(Record->getLocation(), diag::ext_anonymous_union); 2797 else if (!Record->isUnion() && getLangOpts().CPlusPlus) 2798 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2799 else if (!Record->isUnion() && !getLangOpts().C11) 2800 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2801 2802 // C and C++ require different kinds of checks for anonymous 2803 // structs/unions. 2804 bool Invalid = false; 2805 if (getLangOpts().CPlusPlus) { 2806 const char* PrevSpec = 0; 2807 unsigned DiagID; 2808 if (Record->isUnion()) { 2809 // C++ [class.union]p6: 2810 // Anonymous unions declared in a named namespace or in the 2811 // global namespace shall be declared static. 2812 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2813 (isa<TranslationUnitDecl>(Owner) || 2814 (isa<NamespaceDecl>(Owner) && 2815 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2816 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2817 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2818 2819 // Recover by adding 'static'. 2820 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2821 PrevSpec, DiagID); 2822 } 2823 // C++ [class.union]p6: 2824 // A storage class is not allowed in a declaration of an 2825 // anonymous union in a class scope. 2826 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2827 isa<RecordDecl>(Owner)) { 2828 Diag(DS.getStorageClassSpecLoc(), 2829 diag::err_anonymous_union_with_storage_spec) 2830 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2831 2832 // Recover by removing the storage specifier. 2833 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2834 SourceLocation(), 2835 PrevSpec, DiagID); 2836 } 2837 } 2838 2839 // Ignore const/volatile/restrict qualifiers. 2840 if (DS.getTypeQualifiers()) { 2841 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2842 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2843 << Record->isUnion() << 0 2844 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2845 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2846 Diag(DS.getVolatileSpecLoc(), 2847 diag::ext_anonymous_struct_union_qualified) 2848 << Record->isUnion() << 1 2849 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2850 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2851 Diag(DS.getRestrictSpecLoc(), 2852 diag::ext_anonymous_struct_union_qualified) 2853 << Record->isUnion() << 2 2854 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2855 2856 DS.ClearTypeQualifiers(); 2857 } 2858 2859 // C++ [class.union]p2: 2860 // The member-specification of an anonymous union shall only 2861 // define non-static data members. [Note: nested types and 2862 // functions cannot be declared within an anonymous union. ] 2863 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2864 MemEnd = Record->decls_end(); 2865 Mem != MemEnd; ++Mem) { 2866 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2867 // C++ [class.union]p3: 2868 // An anonymous union shall not have private or protected 2869 // members (clause 11). 2870 assert(FD->getAccess() != AS_none); 2871 if (FD->getAccess() != AS_public) { 2872 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2873 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2874 Invalid = true; 2875 } 2876 2877 // C++ [class.union]p1 2878 // An object of a class with a non-trivial constructor, a non-trivial 2879 // copy constructor, a non-trivial destructor, or a non-trivial copy 2880 // assignment operator cannot be a member of a union, nor can an 2881 // array of such objects. 2882 if (CheckNontrivialField(FD)) 2883 Invalid = true; 2884 } else if ((*Mem)->isImplicit()) { 2885 // Any implicit members are fine. 2886 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2887 // This is a type that showed up in an 2888 // elaborated-type-specifier inside the anonymous struct or 2889 // union, but which actually declares a type outside of the 2890 // anonymous struct or union. It's okay. 2891 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2892 if (!MemRecord->isAnonymousStructOrUnion() && 2893 MemRecord->getDeclName()) { 2894 // Visual C++ allows type definition in anonymous struct or union. 2895 if (getLangOpts().MicrosoftExt) 2896 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2897 << (int)Record->isUnion(); 2898 else { 2899 // This is a nested type declaration. 2900 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2901 << (int)Record->isUnion(); 2902 Invalid = true; 2903 } 2904 } 2905 } else if (isa<AccessSpecDecl>(*Mem)) { 2906 // Any access specifier is fine. 2907 } else { 2908 // We have something that isn't a non-static data 2909 // member. Complain about it. 2910 unsigned DK = diag::err_anonymous_record_bad_member; 2911 if (isa<TypeDecl>(*Mem)) 2912 DK = diag::err_anonymous_record_with_type; 2913 else if (isa<FunctionDecl>(*Mem)) 2914 DK = diag::err_anonymous_record_with_function; 2915 else if (isa<VarDecl>(*Mem)) 2916 DK = diag::err_anonymous_record_with_static; 2917 2918 // Visual C++ allows type definition in anonymous struct or union. 2919 if (getLangOpts().MicrosoftExt && 2920 DK == diag::err_anonymous_record_with_type) 2921 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2922 << (int)Record->isUnion(); 2923 else { 2924 Diag((*Mem)->getLocation(), DK) 2925 << (int)Record->isUnion(); 2926 Invalid = true; 2927 } 2928 } 2929 } 2930 } 2931 2932 if (!Record->isUnion() && !Owner->isRecord()) { 2933 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2934 << (int)getLangOpts().CPlusPlus; 2935 Invalid = true; 2936 } 2937 2938 // Mock up a declarator. 2939 Declarator Dc(DS, Declarator::MemberContext); 2940 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2941 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2942 2943 // Create a declaration for this anonymous struct/union. 2944 NamedDecl *Anon = 0; 2945 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2946 Anon = FieldDecl::Create(Context, OwningClass, 2947 DS.getLocStart(), 2948 Record->getLocation(), 2949 /*IdentifierInfo=*/0, 2950 Context.getTypeDeclType(Record), 2951 TInfo, 2952 /*BitWidth=*/0, /*Mutable=*/false, 2953 /*HasInit=*/false); 2954 Anon->setAccess(AS); 2955 if (getLangOpts().CPlusPlus) 2956 FieldCollector->Add(cast<FieldDecl>(Anon)); 2957 } else { 2958 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2959 assert(SCSpec != DeclSpec::SCS_typedef && 2960 "Parser allowed 'typedef' as storage class VarDecl."); 2961 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2962 if (SCSpec == DeclSpec::SCS_mutable) { 2963 // mutable can only appear on non-static class members, so it's always 2964 // an error here 2965 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2966 Invalid = true; 2967 SC = SC_None; 2968 } 2969 SCSpec = DS.getStorageClassSpecAsWritten(); 2970 VarDecl::StorageClass SCAsWritten 2971 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2972 2973 Anon = VarDecl::Create(Context, Owner, 2974 DS.getLocStart(), 2975 Record->getLocation(), /*IdentifierInfo=*/0, 2976 Context.getTypeDeclType(Record), 2977 TInfo, SC, SCAsWritten); 2978 2979 // Default-initialize the implicit variable. This initialization will be 2980 // trivial in almost all cases, except if a union member has an in-class 2981 // initializer: 2982 // union { int n = 0; }; 2983 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2984 } 2985 Anon->setImplicit(); 2986 2987 // Add the anonymous struct/union object to the current 2988 // context. We'll be referencing this object when we refer to one of 2989 // its members. 2990 Owner->addDecl(Anon); 2991 2992 // Inject the members of the anonymous struct/union into the owning 2993 // context and into the identifier resolver chain for name lookup 2994 // purposes. 2995 SmallVector<NamedDecl*, 2> Chain; 2996 Chain.push_back(Anon); 2997 2998 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2999 Chain, false)) 3000 Invalid = true; 3001 3002 // Mark this as an anonymous struct/union type. Note that we do not 3003 // do this until after we have already checked and injected the 3004 // members of this anonymous struct/union type, because otherwise 3005 // the members could be injected twice: once by DeclContext when it 3006 // builds its lookup table, and once by 3007 // InjectAnonymousStructOrUnionMembers. 3008 Record->setAnonymousStructOrUnion(true); 3009 3010 if (Invalid) 3011 Anon->setInvalidDecl(); 3012 3013 return Anon; 3014} 3015 3016/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 3017/// Microsoft C anonymous structure. 3018/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 3019/// Example: 3020/// 3021/// struct A { int a; }; 3022/// struct B { struct A; int b; }; 3023/// 3024/// void foo() { 3025/// B var; 3026/// var.a = 3; 3027/// } 3028/// 3029Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 3030 RecordDecl *Record) { 3031 3032 // If there is no Record, get the record via the typedef. 3033 if (!Record) 3034 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 3035 3036 // Mock up a declarator. 3037 Declarator Dc(DS, Declarator::TypeNameContext); 3038 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 3039 assert(TInfo && "couldn't build declarator info for anonymous struct"); 3040 3041 // Create a declaration for this anonymous struct. 3042 NamedDecl* Anon = FieldDecl::Create(Context, 3043 cast<RecordDecl>(CurContext), 3044 DS.getLocStart(), 3045 DS.getLocStart(), 3046 /*IdentifierInfo=*/0, 3047 Context.getTypeDeclType(Record), 3048 TInfo, 3049 /*BitWidth=*/0, /*Mutable=*/false, 3050 /*HasInit=*/false); 3051 Anon->setImplicit(); 3052 3053 // Add the anonymous struct object to the current context. 3054 CurContext->addDecl(Anon); 3055 3056 // Inject the members of the anonymous struct into the current 3057 // context and into the identifier resolver chain for name lookup 3058 // purposes. 3059 SmallVector<NamedDecl*, 2> Chain; 3060 Chain.push_back(Anon); 3061 3062 RecordDecl *RecordDef = Record->getDefinition(); 3063 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 3064 RecordDef, AS_none, 3065 Chain, true)) 3066 Anon->setInvalidDecl(); 3067 3068 return Anon; 3069} 3070 3071/// GetNameForDeclarator - Determine the full declaration name for the 3072/// given Declarator. 3073DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 3074 return GetNameFromUnqualifiedId(D.getName()); 3075} 3076 3077/// \brief Retrieves the declaration name from a parsed unqualified-id. 3078DeclarationNameInfo 3079Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 3080 DeclarationNameInfo NameInfo; 3081 NameInfo.setLoc(Name.StartLocation); 3082 3083 switch (Name.getKind()) { 3084 3085 case UnqualifiedId::IK_ImplicitSelfParam: 3086 case UnqualifiedId::IK_Identifier: 3087 NameInfo.setName(Name.Identifier); 3088 NameInfo.setLoc(Name.StartLocation); 3089 return NameInfo; 3090 3091 case UnqualifiedId::IK_OperatorFunctionId: 3092 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 3093 Name.OperatorFunctionId.Operator)); 3094 NameInfo.setLoc(Name.StartLocation); 3095 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 3096 = Name.OperatorFunctionId.SymbolLocations[0]; 3097 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 3098 = Name.EndLocation.getRawEncoding(); 3099 return NameInfo; 3100 3101 case UnqualifiedId::IK_LiteralOperatorId: 3102 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 3103 Name.Identifier)); 3104 NameInfo.setLoc(Name.StartLocation); 3105 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3106 return NameInfo; 3107 3108 case UnqualifiedId::IK_ConversionFunctionId: { 3109 TypeSourceInfo *TInfo; 3110 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3111 if (Ty.isNull()) 3112 return DeclarationNameInfo(); 3113 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3114 Context.getCanonicalType(Ty))); 3115 NameInfo.setLoc(Name.StartLocation); 3116 NameInfo.setNamedTypeInfo(TInfo); 3117 return NameInfo; 3118 } 3119 3120 case UnqualifiedId::IK_ConstructorName: { 3121 TypeSourceInfo *TInfo; 3122 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3123 if (Ty.isNull()) 3124 return DeclarationNameInfo(); 3125 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3126 Context.getCanonicalType(Ty))); 3127 NameInfo.setLoc(Name.StartLocation); 3128 NameInfo.setNamedTypeInfo(TInfo); 3129 return NameInfo; 3130 } 3131 3132 case UnqualifiedId::IK_ConstructorTemplateId: { 3133 // In well-formed code, we can only have a constructor 3134 // template-id that refers to the current context, so go there 3135 // to find the actual type being constructed. 3136 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3137 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3138 return DeclarationNameInfo(); 3139 3140 // Determine the type of the class being constructed. 3141 QualType CurClassType = Context.getTypeDeclType(CurClass); 3142 3143 // FIXME: Check two things: that the template-id names the same type as 3144 // CurClassType, and that the template-id does not occur when the name 3145 // was qualified. 3146 3147 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3148 Context.getCanonicalType(CurClassType))); 3149 NameInfo.setLoc(Name.StartLocation); 3150 // FIXME: should we retrieve TypeSourceInfo? 3151 NameInfo.setNamedTypeInfo(0); 3152 return NameInfo; 3153 } 3154 3155 case UnqualifiedId::IK_DestructorName: { 3156 TypeSourceInfo *TInfo; 3157 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3158 if (Ty.isNull()) 3159 return DeclarationNameInfo(); 3160 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3161 Context.getCanonicalType(Ty))); 3162 NameInfo.setLoc(Name.StartLocation); 3163 NameInfo.setNamedTypeInfo(TInfo); 3164 return NameInfo; 3165 } 3166 3167 case UnqualifiedId::IK_TemplateId: { 3168 TemplateName TName = Name.TemplateId->Template.get(); 3169 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3170 return Context.getNameForTemplate(TName, TNameLoc); 3171 } 3172 3173 } // switch (Name.getKind()) 3174 3175 llvm_unreachable("Unknown name kind"); 3176} 3177 3178static QualType getCoreType(QualType Ty) { 3179 do { 3180 if (Ty->isPointerType() || Ty->isReferenceType()) 3181 Ty = Ty->getPointeeType(); 3182 else if (Ty->isArrayType()) 3183 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3184 else 3185 return Ty.withoutLocalFastQualifiers(); 3186 } while (true); 3187} 3188 3189/// hasSimilarParameters - Determine whether the C++ functions Declaration 3190/// and Definition have "nearly" matching parameters. This heuristic is 3191/// used to improve diagnostics in the case where an out-of-line function 3192/// definition doesn't match any declaration within the class or namespace. 3193/// Also sets Params to the list of indices to the parameters that differ 3194/// between the declaration and the definition. If hasSimilarParameters 3195/// returns true and Params is empty, then all of the parameters match. 3196static bool hasSimilarParameters(ASTContext &Context, 3197 FunctionDecl *Declaration, 3198 FunctionDecl *Definition, 3199 llvm::SmallVectorImpl<unsigned> &Params) { 3200 Params.clear(); 3201 if (Declaration->param_size() != Definition->param_size()) 3202 return false; 3203 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3204 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3205 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3206 3207 // The parameter types are identical 3208 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3209 continue; 3210 3211 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3212 QualType DefParamBaseTy = getCoreType(DefParamTy); 3213 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3214 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3215 3216 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3217 (DeclTyName && DeclTyName == DefTyName)) 3218 Params.push_back(Idx); 3219 else // The two parameters aren't even close 3220 return false; 3221 } 3222 3223 return true; 3224} 3225 3226/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3227/// declarator needs to be rebuilt in the current instantiation. 3228/// Any bits of declarator which appear before the name are valid for 3229/// consideration here. That's specifically the type in the decl spec 3230/// and the base type in any member-pointer chunks. 3231static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3232 DeclarationName Name) { 3233 // The types we specifically need to rebuild are: 3234 // - typenames, typeofs, and decltypes 3235 // - types which will become injected class names 3236 // Of course, we also need to rebuild any type referencing such a 3237 // type. It's safest to just say "dependent", but we call out a 3238 // few cases here. 3239 3240 DeclSpec &DS = D.getMutableDeclSpec(); 3241 switch (DS.getTypeSpecType()) { 3242 case DeclSpec::TST_typename: 3243 case DeclSpec::TST_typeofType: 3244 case DeclSpec::TST_decltype: 3245 case DeclSpec::TST_underlyingType: 3246 case DeclSpec::TST_atomic: { 3247 // Grab the type from the parser. 3248 TypeSourceInfo *TSI = 0; 3249 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3250 if (T.isNull() || !T->isDependentType()) break; 3251 3252 // Make sure there's a type source info. This isn't really much 3253 // of a waste; most dependent types should have type source info 3254 // attached already. 3255 if (!TSI) 3256 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3257 3258 // Rebuild the type in the current instantiation. 3259 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3260 if (!TSI) return true; 3261 3262 // Store the new type back in the decl spec. 3263 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3264 DS.UpdateTypeRep(LocType); 3265 break; 3266 } 3267 3268 case DeclSpec::TST_typeofExpr: { 3269 Expr *E = DS.getRepAsExpr(); 3270 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3271 if (Result.isInvalid()) return true; 3272 DS.UpdateExprRep(Result.get()); 3273 break; 3274 } 3275 3276 default: 3277 // Nothing to do for these decl specs. 3278 break; 3279 } 3280 3281 // It doesn't matter what order we do this in. 3282 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3283 DeclaratorChunk &Chunk = D.getTypeObject(I); 3284 3285 // The only type information in the declarator which can come 3286 // before the declaration name is the base type of a member 3287 // pointer. 3288 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3289 continue; 3290 3291 // Rebuild the scope specifier in-place. 3292 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3293 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3294 return true; 3295 } 3296 3297 return false; 3298} 3299 3300Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3301 D.setFunctionDefinitionKind(FDK_Declaration); 3302 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3303 3304 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3305 Dcl && Dcl->getDeclContext()->isFileContext()) 3306 Dcl->setTopLevelDeclInObjCContainer(); 3307 3308 return Dcl; 3309} 3310 3311/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3312/// If T is the name of a class, then each of the following shall have a 3313/// name different from T: 3314/// - every static data member of class T; 3315/// - every member function of class T 3316/// - every member of class T that is itself a type; 3317/// \returns true if the declaration name violates these rules. 3318bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3319 DeclarationNameInfo NameInfo) { 3320 DeclarationName Name = NameInfo.getName(); 3321 3322 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3323 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3324 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3325 return true; 3326 } 3327 3328 return false; 3329} 3330 3331/// \brief Diagnose a declaration whose declarator-id has the given 3332/// nested-name-specifier. 3333/// 3334/// \param SS The nested-name-specifier of the declarator-id. 3335/// 3336/// \param DC The declaration context to which the nested-name-specifier 3337/// resolves. 3338/// 3339/// \param Name The name of the entity being declared. 3340/// 3341/// \param Loc The location of the name of the entity being declared. 3342/// 3343/// \returns true if we cannot safely recover from this error, false otherwise. 3344bool Sema::diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC, 3345 DeclarationName Name, 3346 SourceLocation Loc) { 3347 DeclContext *Cur = CurContext; 3348 while (isa<LinkageSpecDecl>(Cur)) 3349 Cur = Cur->getParent(); 3350 3351 // C++ [dcl.meaning]p1: 3352 // A declarator-id shall not be qualified except for the definition 3353 // of a member function (9.3) or static data member (9.4) outside of 3354 // its class, the definition or explicit instantiation of a function 3355 // or variable member of a namespace outside of its namespace, or the 3356 // definition of an explicit specialization outside of its namespace, 3357 // or the declaration of a friend function that is a member of 3358 // another class or namespace (11.3). [...] 3359 3360 // The user provided a superfluous scope specifier that refers back to the 3361 // class or namespaces in which the entity is already declared. 3362 // 3363 // class X { 3364 // void X::f(); 3365 // }; 3366 if (Cur->Equals(DC)) { 3367 Diag(Loc, diag::warn_member_extra_qualification) 3368 << Name << FixItHint::CreateRemoval(SS.getRange()); 3369 SS.clear(); 3370 return false; 3371 } 3372 3373 // Check whether the qualifying scope encloses the scope of the original 3374 // declaration. 3375 if (!Cur->Encloses(DC)) { 3376 if (Cur->isRecord()) 3377 Diag(Loc, diag::err_member_qualification) 3378 << Name << SS.getRange(); 3379 else if (isa<TranslationUnitDecl>(DC)) 3380 Diag(Loc, diag::err_invalid_declarator_global_scope) 3381 << Name << SS.getRange(); 3382 else if (isa<FunctionDecl>(Cur)) 3383 Diag(Loc, diag::err_invalid_declarator_in_function) 3384 << Name << SS.getRange(); 3385 else 3386 Diag(Loc, diag::err_invalid_declarator_scope) 3387 << Name << cast<NamedDecl>(Cur) << cast<NamedDecl>(DC) << SS.getRange(); 3388 3389 return true; 3390 } 3391 3392 if (Cur->isRecord()) { 3393 // Cannot qualify members within a class. 3394 Diag(Loc, diag::err_member_qualification) 3395 << Name << SS.getRange(); 3396 SS.clear(); 3397 3398 // C++ constructors and destructors with incorrect scopes can break 3399 // our AST invariants by having the wrong underlying types. If 3400 // that's the case, then drop this declaration entirely. 3401 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3402 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3403 !Context.hasSameType(Name.getCXXNameType(), 3404 Context.getTypeDeclType(cast<CXXRecordDecl>(Cur)))) 3405 return true; 3406 3407 return false; 3408 } 3409 3410 // C++11 [dcl.meaning]p1: 3411 // [...] "The nested-name-specifier of the qualified declarator-id shall 3412 // not begin with a decltype-specifer" 3413 NestedNameSpecifierLoc SpecLoc(SS.getScopeRep(), SS.location_data()); 3414 while (SpecLoc.getPrefix()) 3415 SpecLoc = SpecLoc.getPrefix(); 3416 if (dyn_cast_or_null<DecltypeType>( 3417 SpecLoc.getNestedNameSpecifier()->getAsType())) 3418 Diag(Loc, diag::err_decltype_in_declarator) 3419 << SpecLoc.getTypeLoc().getSourceRange(); 3420 3421 return false; 3422} 3423 3424Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3425 MultiTemplateParamsArg TemplateParamLists) { 3426 // TODO: consider using NameInfo for diagnostic. 3427 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3428 DeclarationName Name = NameInfo.getName(); 3429 3430 // All of these full declarators require an identifier. If it doesn't have 3431 // one, the ParsedFreeStandingDeclSpec action should be used. 3432 if (!Name) { 3433 if (!D.isInvalidType()) // Reject this if we think it is valid. 3434 Diag(D.getDeclSpec().getLocStart(), 3435 diag::err_declarator_need_ident) 3436 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3437 return 0; 3438 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3439 return 0; 3440 3441 // The scope passed in may not be a decl scope. Zip up the scope tree until 3442 // we find one that is. 3443 while ((S->getFlags() & Scope::DeclScope) == 0 || 3444 (S->getFlags() & Scope::TemplateParamScope) != 0) 3445 S = S->getParent(); 3446 3447 DeclContext *DC = CurContext; 3448 if (D.getCXXScopeSpec().isInvalid()) 3449 D.setInvalidType(); 3450 else if (D.getCXXScopeSpec().isSet()) { 3451 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3452 UPPC_DeclarationQualifier)) 3453 return 0; 3454 3455 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3456 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3457 if (!DC) { 3458 // If we could not compute the declaration context, it's because the 3459 // declaration context is dependent but does not refer to a class, 3460 // class template, or class template partial specialization. Complain 3461 // and return early, to avoid the coming semantic disaster. 3462 Diag(D.getIdentifierLoc(), 3463 diag::err_template_qualified_declarator_no_match) 3464 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3465 << D.getCXXScopeSpec().getRange(); 3466 return 0; 3467 } 3468 bool IsDependentContext = DC->isDependentContext(); 3469 3470 if (!IsDependentContext && 3471 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3472 return 0; 3473 3474 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 3475 Diag(D.getIdentifierLoc(), 3476 diag::err_member_def_undefined_record) 3477 << Name << DC << D.getCXXScopeSpec().getRange(); 3478 D.setInvalidType(); 3479 } else if (!D.getDeclSpec().isFriendSpecified()) { 3480 if (diagnoseQualifiedDeclaration(D.getCXXScopeSpec(), DC, 3481 Name, D.getIdentifierLoc())) { 3482 if (DC->isRecord()) 3483 return 0; 3484 3485 D.setInvalidType(); 3486 } 3487 } 3488 3489 // Check whether we need to rebuild the type of the given 3490 // declaration in the current instantiation. 3491 if (EnteringContext && IsDependentContext && 3492 TemplateParamLists.size() != 0) { 3493 ContextRAII SavedContext(*this, DC); 3494 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3495 D.setInvalidType(); 3496 } 3497 } 3498 3499 if (DiagnoseClassNameShadow(DC, NameInfo)) 3500 // If this is a typedef, we'll end up spewing multiple diagnostics. 3501 // Just return early; it's safer. 3502 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3503 return 0; 3504 3505 NamedDecl *New; 3506 3507 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3508 QualType R = TInfo->getType(); 3509 3510 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3511 UPPC_DeclarationType)) 3512 D.setInvalidType(); 3513 3514 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3515 ForRedeclaration); 3516 3517 // See if this is a redefinition of a variable in the same scope. 3518 if (!D.getCXXScopeSpec().isSet()) { 3519 bool IsLinkageLookup = false; 3520 3521 // If the declaration we're planning to build will be a function 3522 // or object with linkage, then look for another declaration with 3523 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3524 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3525 /* Do nothing*/; 3526 else if (R->isFunctionType()) { 3527 if (CurContext->isFunctionOrMethod() || 3528 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3529 IsLinkageLookup = true; 3530 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3531 IsLinkageLookup = true; 3532 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3533 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3534 IsLinkageLookup = true; 3535 3536 if (IsLinkageLookup) 3537 Previous.clear(LookupRedeclarationWithLinkage); 3538 3539 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3540 } else { // Something like "int foo::x;" 3541 LookupQualifiedName(Previous, DC); 3542 3543 // C++ [dcl.meaning]p1: 3544 // When the declarator-id is qualified, the declaration shall refer to a 3545 // previously declared member of the class or namespace to which the 3546 // qualifier refers (or, in the case of a namespace, of an element of the 3547 // inline namespace set of that namespace (7.3.1)) or to a specialization 3548 // thereof; [...] 3549 // 3550 // Note that we already checked the context above, and that we do not have 3551 // enough information to make sure that Previous contains the declaration 3552 // we want to match. For example, given: 3553 // 3554 // class X { 3555 // void f(); 3556 // void f(float); 3557 // }; 3558 // 3559 // void X::f(int) { } // ill-formed 3560 // 3561 // In this case, Previous will point to the overload set 3562 // containing the two f's declared in X, but neither of them 3563 // matches. 3564 3565 // C++ [dcl.meaning]p1: 3566 // [...] the member shall not merely have been introduced by a 3567 // using-declaration in the scope of the class or namespace nominated by 3568 // the nested-name-specifier of the declarator-id. 3569 RemoveUsingDecls(Previous); 3570 } 3571 3572 if (Previous.isSingleResult() && 3573 Previous.getFoundDecl()->isTemplateParameter()) { 3574 // Maybe we will complain about the shadowed template parameter. 3575 if (!D.isInvalidType()) 3576 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3577 Previous.getFoundDecl()); 3578 3579 // Just pretend that we didn't see the previous declaration. 3580 Previous.clear(); 3581 } 3582 3583 // In C++, the previous declaration we find might be a tag type 3584 // (class or enum). In this case, the new declaration will hide the 3585 // tag type. Note that this does does not apply if we're declaring a 3586 // typedef (C++ [dcl.typedef]p4). 3587 if (Previous.isSingleTagDecl() && 3588 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3589 Previous.clear(); 3590 3591 bool AddToScope = true; 3592 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3593 if (TemplateParamLists.size()) { 3594 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3595 return 0; 3596 } 3597 3598 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3599 } else if (R->isFunctionType()) { 3600 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3601 move(TemplateParamLists), 3602 AddToScope); 3603 } else { 3604 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3605 move(TemplateParamLists)); 3606 } 3607 3608 if (New == 0) 3609 return 0; 3610 3611 // If this has an identifier and is not an invalid redeclaration or 3612 // function template specialization, add it to the scope stack. 3613 if (New->getDeclName() && AddToScope && 3614 !(D.isRedeclaration() && New->isInvalidDecl())) 3615 PushOnScopeChains(New, S); 3616 3617 return New; 3618} 3619 3620/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3621/// types into constant array types in certain situations which would otherwise 3622/// be errors (for GCC compatibility). 3623static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3624 ASTContext &Context, 3625 bool &SizeIsNegative, 3626 llvm::APSInt &Oversized) { 3627 // This method tries to turn a variable array into a constant 3628 // array even when the size isn't an ICE. This is necessary 3629 // for compatibility with code that depends on gcc's buggy 3630 // constant expression folding, like struct {char x[(int)(char*)2];} 3631 SizeIsNegative = false; 3632 Oversized = 0; 3633 3634 if (T->isDependentType()) 3635 return QualType(); 3636 3637 QualifierCollector Qs; 3638 const Type *Ty = Qs.strip(T); 3639 3640 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3641 QualType Pointee = PTy->getPointeeType(); 3642 QualType FixedType = 3643 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3644 Oversized); 3645 if (FixedType.isNull()) return FixedType; 3646 FixedType = Context.getPointerType(FixedType); 3647 return Qs.apply(Context, FixedType); 3648 } 3649 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3650 QualType Inner = PTy->getInnerType(); 3651 QualType FixedType = 3652 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3653 Oversized); 3654 if (FixedType.isNull()) return FixedType; 3655 FixedType = Context.getParenType(FixedType); 3656 return Qs.apply(Context, FixedType); 3657 } 3658 3659 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3660 if (!VLATy) 3661 return QualType(); 3662 // FIXME: We should probably handle this case 3663 if (VLATy->getElementType()->isVariablyModifiedType()) 3664 return QualType(); 3665 3666 llvm::APSInt Res; 3667 if (!VLATy->getSizeExpr() || 3668 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3669 return QualType(); 3670 3671 // Check whether the array size is negative. 3672 if (Res.isSigned() && Res.isNegative()) { 3673 SizeIsNegative = true; 3674 return QualType(); 3675 } 3676 3677 // Check whether the array is too large to be addressed. 3678 unsigned ActiveSizeBits 3679 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3680 Res); 3681 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3682 Oversized = Res; 3683 return QualType(); 3684 } 3685 3686 return Context.getConstantArrayType(VLATy->getElementType(), 3687 Res, ArrayType::Normal, 0); 3688} 3689 3690/// \brief Register the given locally-scoped external C declaration so 3691/// that it can be found later for redeclarations 3692void 3693Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3694 const LookupResult &Previous, 3695 Scope *S) { 3696 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3697 "Decl is not a locally-scoped decl!"); 3698 // Note that we have a locally-scoped external with this name. 3699 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3700 3701 if (!Previous.isSingleResult()) 3702 return; 3703 3704 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3705 3706 // If there was a previous declaration of this variable, it may be 3707 // in our identifier chain. Update the identifier chain with the new 3708 // declaration. 3709 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3710 // The previous declaration was found on the identifer resolver 3711 // chain, so remove it from its scope. 3712 3713 if (S->isDeclScope(PrevDecl)) { 3714 // Special case for redeclarations in the SAME scope. 3715 // Because this declaration is going to be added to the identifier chain 3716 // later, we should temporarily take it OFF the chain. 3717 IdResolver.RemoveDecl(ND); 3718 3719 } else { 3720 // Find the scope for the original declaration. 3721 while (S && !S->isDeclScope(PrevDecl)) 3722 S = S->getParent(); 3723 } 3724 3725 if (S) 3726 S->RemoveDecl(PrevDecl); 3727 } 3728} 3729 3730llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3731Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3732 if (ExternalSource) { 3733 // Load locally-scoped external decls from the external source. 3734 SmallVector<NamedDecl *, 4> Decls; 3735 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3736 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3737 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3738 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3739 if (Pos == LocallyScopedExternalDecls.end()) 3740 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3741 } 3742 } 3743 3744 return LocallyScopedExternalDecls.find(Name); 3745} 3746 3747/// \brief Diagnose function specifiers on a declaration of an identifier that 3748/// does not identify a function. 3749void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3750 // FIXME: We should probably indicate the identifier in question to avoid 3751 // confusion for constructs like "inline int a(), b;" 3752 if (D.getDeclSpec().isInlineSpecified()) 3753 Diag(D.getDeclSpec().getInlineSpecLoc(), 3754 diag::err_inline_non_function); 3755 3756 if (D.getDeclSpec().isVirtualSpecified()) 3757 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3758 diag::err_virtual_non_function); 3759 3760 if (D.getDeclSpec().isExplicitSpecified()) 3761 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3762 diag::err_explicit_non_function); 3763} 3764 3765NamedDecl* 3766Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3767 TypeSourceInfo *TInfo, LookupResult &Previous) { 3768 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3769 if (D.getCXXScopeSpec().isSet()) { 3770 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3771 << D.getCXXScopeSpec().getRange(); 3772 D.setInvalidType(); 3773 // Pretend we didn't see the scope specifier. 3774 DC = CurContext; 3775 Previous.clear(); 3776 } 3777 3778 if (getLangOpts().CPlusPlus) { 3779 // Check that there are no default arguments (C++ only). 3780 CheckExtraCXXDefaultArguments(D); 3781 } 3782 3783 DiagnoseFunctionSpecifiers(D); 3784 3785 if (D.getDeclSpec().isThreadSpecified()) 3786 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3787 if (D.getDeclSpec().isConstexprSpecified()) 3788 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3789 << 1; 3790 3791 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3792 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3793 << D.getName().getSourceRange(); 3794 return 0; 3795 } 3796 3797 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3798 if (!NewTD) return 0; 3799 3800 // Handle attributes prior to checking for duplicates in MergeVarDecl 3801 ProcessDeclAttributes(S, NewTD, D); 3802 3803 CheckTypedefForVariablyModifiedType(S, NewTD); 3804 3805 bool Redeclaration = D.isRedeclaration(); 3806 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3807 D.setRedeclaration(Redeclaration); 3808 return ND; 3809} 3810 3811void 3812Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3813 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3814 // then it shall have block scope. 3815 // Note that variably modified types must be fixed before merging the decl so 3816 // that redeclarations will match. 3817 QualType T = NewTD->getUnderlyingType(); 3818 if (T->isVariablyModifiedType()) { 3819 getCurFunction()->setHasBranchProtectedScope(); 3820 3821 if (S->getFnParent() == 0) { 3822 bool SizeIsNegative; 3823 llvm::APSInt Oversized; 3824 QualType FixedTy = 3825 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3826 Oversized); 3827 if (!FixedTy.isNull()) { 3828 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3829 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3830 } else { 3831 if (SizeIsNegative) 3832 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3833 else if (T->isVariableArrayType()) 3834 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3835 else if (Oversized.getBoolValue()) 3836 Diag(NewTD->getLocation(), diag::err_array_too_large) 3837 << Oversized.toString(10); 3838 else 3839 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3840 NewTD->setInvalidDecl(); 3841 } 3842 } 3843 } 3844} 3845 3846 3847/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3848/// declares a typedef-name, either using the 'typedef' type specifier or via 3849/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3850NamedDecl* 3851Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3852 LookupResult &Previous, bool &Redeclaration) { 3853 // Merge the decl with the existing one if appropriate. If the decl is 3854 // in an outer scope, it isn't the same thing. 3855 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3856 /*ExplicitInstantiationOrSpecialization=*/false); 3857 if (!Previous.empty()) { 3858 Redeclaration = true; 3859 MergeTypedefNameDecl(NewTD, Previous); 3860 } 3861 3862 // If this is the C FILE type, notify the AST context. 3863 if (IdentifierInfo *II = NewTD->getIdentifier()) 3864 if (!NewTD->isInvalidDecl() && 3865 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3866 if (II->isStr("FILE")) 3867 Context.setFILEDecl(NewTD); 3868 else if (II->isStr("jmp_buf")) 3869 Context.setjmp_bufDecl(NewTD); 3870 else if (II->isStr("sigjmp_buf")) 3871 Context.setsigjmp_bufDecl(NewTD); 3872 else if (II->isStr("ucontext_t")) 3873 Context.setucontext_tDecl(NewTD); 3874 else if (II->isStr("__builtin_va_list")) 3875 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3876 } 3877 3878 return NewTD; 3879} 3880 3881/// \brief Determines whether the given declaration is an out-of-scope 3882/// previous declaration. 3883/// 3884/// This routine should be invoked when name lookup has found a 3885/// previous declaration (PrevDecl) that is not in the scope where a 3886/// new declaration by the same name is being introduced. If the new 3887/// declaration occurs in a local scope, previous declarations with 3888/// linkage may still be considered previous declarations (C99 3889/// 6.2.2p4-5, C++ [basic.link]p6). 3890/// 3891/// \param PrevDecl the previous declaration found by name 3892/// lookup 3893/// 3894/// \param DC the context in which the new declaration is being 3895/// declared. 3896/// 3897/// \returns true if PrevDecl is an out-of-scope previous declaration 3898/// for a new delcaration with the same name. 3899static bool 3900isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3901 ASTContext &Context) { 3902 if (!PrevDecl) 3903 return false; 3904 3905 if (!PrevDecl->hasLinkage()) 3906 return false; 3907 3908 if (Context.getLangOpts().CPlusPlus) { 3909 // C++ [basic.link]p6: 3910 // If there is a visible declaration of an entity with linkage 3911 // having the same name and type, ignoring entities declared 3912 // outside the innermost enclosing namespace scope, the block 3913 // scope declaration declares that same entity and receives the 3914 // linkage of the previous declaration. 3915 DeclContext *OuterContext = DC->getRedeclContext(); 3916 if (!OuterContext->isFunctionOrMethod()) 3917 // This rule only applies to block-scope declarations. 3918 return false; 3919 3920 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3921 if (PrevOuterContext->isRecord()) 3922 // We found a member function: ignore it. 3923 return false; 3924 3925 // Find the innermost enclosing namespace for the new and 3926 // previous declarations. 3927 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3928 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3929 3930 // The previous declaration is in a different namespace, so it 3931 // isn't the same function. 3932 if (!OuterContext->Equals(PrevOuterContext)) 3933 return false; 3934 } 3935 3936 return true; 3937} 3938 3939static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3940 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3941 if (!SS.isSet()) return; 3942 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3943} 3944 3945bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3946 QualType type = decl->getType(); 3947 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3948 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3949 // Various kinds of declaration aren't allowed to be __autoreleasing. 3950 unsigned kind = -1U; 3951 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3952 if (var->hasAttr<BlocksAttr>()) 3953 kind = 0; // __block 3954 else if (!var->hasLocalStorage()) 3955 kind = 1; // global 3956 } else if (isa<ObjCIvarDecl>(decl)) { 3957 kind = 3; // ivar 3958 } else if (isa<FieldDecl>(decl)) { 3959 kind = 2; // field 3960 } 3961 3962 if (kind != -1U) { 3963 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3964 << kind; 3965 } 3966 } else if (lifetime == Qualifiers::OCL_None) { 3967 // Try to infer lifetime. 3968 if (!type->isObjCLifetimeType()) 3969 return false; 3970 3971 lifetime = type->getObjCARCImplicitLifetime(); 3972 type = Context.getLifetimeQualifiedType(type, lifetime); 3973 decl->setType(type); 3974 } 3975 3976 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3977 // Thread-local variables cannot have lifetime. 3978 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3979 var->isThreadSpecified()) { 3980 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3981 << var->getType(); 3982 return true; 3983 } 3984 } 3985 3986 return false; 3987} 3988 3989NamedDecl* 3990Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3991 TypeSourceInfo *TInfo, LookupResult &Previous, 3992 MultiTemplateParamsArg TemplateParamLists) { 3993 QualType R = TInfo->getType(); 3994 DeclarationName Name = GetNameForDeclarator(D).getName(); 3995 3996 // Check that there are no default arguments (C++ only). 3997 if (getLangOpts().CPlusPlus) 3998 CheckExtraCXXDefaultArguments(D); 3999 4000 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 4001 assert(SCSpec != DeclSpec::SCS_typedef && 4002 "Parser allowed 'typedef' as storage class VarDecl."); 4003 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 4004 if (SCSpec == DeclSpec::SCS_mutable) { 4005 // mutable can only appear on non-static class members, so it's always 4006 // an error here 4007 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 4008 D.setInvalidType(); 4009 SC = SC_None; 4010 } 4011 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4012 VarDecl::StorageClass SCAsWritten 4013 = StorageClassSpecToVarDeclStorageClass(SCSpec); 4014 4015 IdentifierInfo *II = Name.getAsIdentifierInfo(); 4016 if (!II) { 4017 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 4018 << Name; 4019 return 0; 4020 } 4021 4022 DiagnoseFunctionSpecifiers(D); 4023 4024 if (!DC->isRecord() && S->getFnParent() == 0) { 4025 // C99 6.9p2: The storage-class specifiers auto and register shall not 4026 // appear in the declaration specifiers in an external declaration. 4027 if (SC == SC_Auto || SC == SC_Register) { 4028 4029 // If this is a register variable with an asm label specified, then this 4030 // is a GNU extension. 4031 if (SC == SC_Register && D.getAsmLabel()) 4032 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 4033 else 4034 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 4035 D.setInvalidType(); 4036 } 4037 } 4038 4039 if (getLangOpts().OpenCL) { 4040 // Set up the special work-group-local storage class for variables in the 4041 // OpenCL __local address space. 4042 if (R.getAddressSpace() == LangAS::opencl_local) 4043 SC = SC_OpenCLWorkGroupLocal; 4044 } 4045 4046 bool isExplicitSpecialization = false; 4047 VarDecl *NewVD; 4048 if (!getLangOpts().CPlusPlus) { 4049 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4050 D.getIdentifierLoc(), II, 4051 R, TInfo, SC, SCAsWritten); 4052 4053 if (D.isInvalidType()) 4054 NewVD->setInvalidDecl(); 4055 } else { 4056 if (DC->isRecord() && !CurContext->isRecord()) { 4057 // This is an out-of-line definition of a static data member. 4058 if (SC == SC_Static) { 4059 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4060 diag::err_static_out_of_line) 4061 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4062 } else if (SC == SC_None) 4063 SC = SC_Static; 4064 } 4065 if (SC == SC_Static && CurContext->isRecord()) { 4066 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 4067 if (RD->isLocalClass()) 4068 Diag(D.getIdentifierLoc(), 4069 diag::err_static_data_member_not_allowed_in_local_class) 4070 << Name << RD->getDeclName(); 4071 4072 // C++98 [class.union]p1: If a union contains a static data member, 4073 // the program is ill-formed. C++11 drops this restriction. 4074 if (RD->isUnion()) 4075 Diag(D.getIdentifierLoc(), 4076 getLangOpts().CPlusPlus0x 4077 ? diag::warn_cxx98_compat_static_data_member_in_union 4078 : diag::ext_static_data_member_in_union) << Name; 4079 // We conservatively disallow static data members in anonymous structs. 4080 else if (!RD->getDeclName()) 4081 Diag(D.getIdentifierLoc(), 4082 diag::err_static_data_member_not_allowed_in_anon_struct) 4083 << Name << RD->isUnion(); 4084 } 4085 } 4086 4087 // Match up the template parameter lists with the scope specifier, then 4088 // determine whether we have a template or a template specialization. 4089 isExplicitSpecialization = false; 4090 bool Invalid = false; 4091 if (TemplateParameterList *TemplateParams 4092 = MatchTemplateParametersToScopeSpecifier( 4093 D.getDeclSpec().getLocStart(), 4094 D.getIdentifierLoc(), 4095 D.getCXXScopeSpec(), 4096 TemplateParamLists.get(), 4097 TemplateParamLists.size(), 4098 /*never a friend*/ false, 4099 isExplicitSpecialization, 4100 Invalid)) { 4101 if (TemplateParams->size() > 0) { 4102 // There is no such thing as a variable template. 4103 Diag(D.getIdentifierLoc(), diag::err_template_variable) 4104 << II 4105 << SourceRange(TemplateParams->getTemplateLoc(), 4106 TemplateParams->getRAngleLoc()); 4107 return 0; 4108 } else { 4109 // There is an extraneous 'template<>' for this variable. Complain 4110 // about it, but allow the declaration of the variable. 4111 Diag(TemplateParams->getTemplateLoc(), 4112 diag::err_template_variable_noparams) 4113 << II 4114 << SourceRange(TemplateParams->getTemplateLoc(), 4115 TemplateParams->getRAngleLoc()); 4116 } 4117 } 4118 4119 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4120 D.getIdentifierLoc(), II, 4121 R, TInfo, SC, SCAsWritten); 4122 4123 // If this decl has an auto type in need of deduction, make a note of the 4124 // Decl so we can diagnose uses of it in its own initializer. 4125 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 4126 R->getContainedAutoType()) 4127 ParsingInitForAutoVars.insert(NewVD); 4128 4129 if (D.isInvalidType() || Invalid) 4130 NewVD->setInvalidDecl(); 4131 4132 SetNestedNameSpecifier(NewVD, D); 4133 4134 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 4135 NewVD->setTemplateParameterListsInfo(Context, 4136 TemplateParamLists.size(), 4137 TemplateParamLists.release()); 4138 } 4139 4140 if (D.getDeclSpec().isConstexprSpecified()) 4141 NewVD->setConstexpr(true); 4142 } 4143 4144 // Set the lexical context. If the declarator has a C++ scope specifier, the 4145 // lexical context will be different from the semantic context. 4146 NewVD->setLexicalDeclContext(CurContext); 4147 4148 if (D.getDeclSpec().isThreadSpecified()) { 4149 if (NewVD->hasLocalStorage()) 4150 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4151 else if (!Context.getTargetInfo().isTLSSupported()) 4152 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4153 else 4154 NewVD->setThreadSpecified(true); 4155 } 4156 4157 if (D.getDeclSpec().isModulePrivateSpecified()) { 4158 if (isExplicitSpecialization) 4159 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4160 << 2 4161 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4162 else if (NewVD->hasLocalStorage()) 4163 Diag(NewVD->getLocation(), diag::err_module_private_local) 4164 << 0 << NewVD->getDeclName() 4165 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4166 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4167 else 4168 NewVD->setModulePrivate(); 4169 } 4170 4171 // Handle attributes prior to checking for duplicates in MergeVarDecl 4172 ProcessDeclAttributes(S, NewVD, D); 4173 4174 // In auto-retain/release, infer strong retension for variables of 4175 // retainable type. 4176 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4177 NewVD->setInvalidDecl(); 4178 4179 // Handle GNU asm-label extension (encoded as an attribute). 4180 if (Expr *E = (Expr*)D.getAsmLabel()) { 4181 // The parser guarantees this is a string. 4182 StringLiteral *SE = cast<StringLiteral>(E); 4183 StringRef Label = SE->getString(); 4184 if (S->getFnParent() != 0) { 4185 switch (SC) { 4186 case SC_None: 4187 case SC_Auto: 4188 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4189 break; 4190 case SC_Register: 4191 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4192 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4193 break; 4194 case SC_Static: 4195 case SC_Extern: 4196 case SC_PrivateExtern: 4197 case SC_OpenCLWorkGroupLocal: 4198 break; 4199 } 4200 } 4201 4202 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4203 Context, Label)); 4204 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 4205 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 4206 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier()); 4207 if (I != ExtnameUndeclaredIdentifiers.end()) { 4208 NewVD->addAttr(I->second); 4209 ExtnameUndeclaredIdentifiers.erase(I); 4210 } 4211 } 4212 4213 // Diagnose shadowed variables before filtering for scope. 4214 if (!D.getCXXScopeSpec().isSet()) 4215 CheckShadow(S, NewVD, Previous); 4216 4217 // Don't consider existing declarations that are in a different 4218 // scope and are out-of-semantic-context declarations (if the new 4219 // declaration has linkage). 4220 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4221 isExplicitSpecialization); 4222 4223 if (!getLangOpts().CPlusPlus) { 4224 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4225 } else { 4226 // Merge the decl with the existing one if appropriate. 4227 if (!Previous.empty()) { 4228 if (Previous.isSingleResult() && 4229 isa<FieldDecl>(Previous.getFoundDecl()) && 4230 D.getCXXScopeSpec().isSet()) { 4231 // The user tried to define a non-static data member 4232 // out-of-line (C++ [dcl.meaning]p1). 4233 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4234 << D.getCXXScopeSpec().getRange(); 4235 Previous.clear(); 4236 NewVD->setInvalidDecl(); 4237 } 4238 } else if (D.getCXXScopeSpec().isSet()) { 4239 // No previous declaration in the qualifying scope. 4240 Diag(D.getIdentifierLoc(), diag::err_no_member) 4241 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4242 << D.getCXXScopeSpec().getRange(); 4243 NewVD->setInvalidDecl(); 4244 } 4245 4246 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4247 4248 // This is an explicit specialization of a static data member. Check it. 4249 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4250 CheckMemberSpecialization(NewVD, Previous)) 4251 NewVD->setInvalidDecl(); 4252 } 4253 4254 // attributes declared post-definition are currently ignored 4255 // FIXME: This should be handled in attribute merging, not 4256 // here. 4257 if (Previous.isSingleResult()) { 4258 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4259 if (Def && (Def = Def->getDefinition()) && 4260 Def != NewVD && D.hasAttributes()) { 4261 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4262 Diag(Def->getLocation(), diag::note_previous_definition); 4263 } 4264 } 4265 4266 // If this is a locally-scoped extern C variable, update the map of 4267 // such variables. 4268 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4269 !NewVD->isInvalidDecl()) 4270 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4271 4272 // If there's a #pragma GCC visibility in scope, and this isn't a class 4273 // member, set the visibility of this variable. 4274 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4275 AddPushedVisibilityAttribute(NewVD); 4276 4277 MarkUnusedFileScopedDecl(NewVD); 4278 4279 return NewVD; 4280} 4281 4282/// \brief Diagnose variable or built-in function shadowing. Implements 4283/// -Wshadow. 4284/// 4285/// This method is called whenever a VarDecl is added to a "useful" 4286/// scope. 4287/// 4288/// \param S the scope in which the shadowing name is being declared 4289/// \param R the lookup of the name 4290/// 4291void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4292 // Return if warning is ignored. 4293 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4294 DiagnosticsEngine::Ignored) 4295 return; 4296 4297 // Don't diagnose declarations at file scope. 4298 if (D->hasGlobalStorage()) 4299 return; 4300 4301 DeclContext *NewDC = D->getDeclContext(); 4302 4303 // Only diagnose if we're shadowing an unambiguous field or variable. 4304 if (R.getResultKind() != LookupResult::Found) 4305 return; 4306 4307 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4308 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4309 return; 4310 4311 // Fields are not shadowed by variables in C++ static methods. 4312 if (isa<FieldDecl>(ShadowedDecl)) 4313 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4314 if (MD->isStatic()) 4315 return; 4316 4317 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4318 if (shadowedVar->isExternC()) { 4319 // For shadowing external vars, make sure that we point to the global 4320 // declaration, not a locally scoped extern declaration. 4321 for (VarDecl::redecl_iterator 4322 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4323 I != E; ++I) 4324 if (I->isFileVarDecl()) { 4325 ShadowedDecl = *I; 4326 break; 4327 } 4328 } 4329 4330 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4331 4332 // Only warn about certain kinds of shadowing for class members. 4333 if (NewDC && NewDC->isRecord()) { 4334 // In particular, don't warn about shadowing non-class members. 4335 if (!OldDC->isRecord()) 4336 return; 4337 4338 // TODO: should we warn about static data members shadowing 4339 // static data members from base classes? 4340 4341 // TODO: don't diagnose for inaccessible shadowed members. 4342 // This is hard to do perfectly because we might friend the 4343 // shadowing context, but that's just a false negative. 4344 } 4345 4346 // Determine what kind of declaration we're shadowing. 4347 unsigned Kind; 4348 if (isa<RecordDecl>(OldDC)) { 4349 if (isa<FieldDecl>(ShadowedDecl)) 4350 Kind = 3; // field 4351 else 4352 Kind = 2; // static data member 4353 } else if (OldDC->isFileContext()) 4354 Kind = 1; // global 4355 else 4356 Kind = 0; // local 4357 4358 DeclarationName Name = R.getLookupName(); 4359 4360 // Emit warning and note. 4361 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4362 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4363} 4364 4365/// \brief Check -Wshadow without the advantage of a previous lookup. 4366void Sema::CheckShadow(Scope *S, VarDecl *D) { 4367 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4368 DiagnosticsEngine::Ignored) 4369 return; 4370 4371 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4372 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4373 LookupName(R, S); 4374 CheckShadow(S, D, R); 4375} 4376 4377/// \brief Perform semantic checking on a newly-created variable 4378/// declaration. 4379/// 4380/// This routine performs all of the type-checking required for a 4381/// variable declaration once it has been built. It is used both to 4382/// check variables after they have been parsed and their declarators 4383/// have been translated into a declaration, and to check variables 4384/// that have been instantiated from a template. 4385/// 4386/// Sets NewVD->isInvalidDecl() if an error was encountered. 4387/// 4388/// Returns true if the variable declaration is a redeclaration. 4389bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4390 LookupResult &Previous) { 4391 // If the decl is already known invalid, don't check it. 4392 if (NewVD->isInvalidDecl()) 4393 return false; 4394 4395 QualType T = NewVD->getType(); 4396 4397 if (T->isObjCObjectType()) { 4398 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4399 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4400 T = Context.getObjCObjectPointerType(T); 4401 NewVD->setType(T); 4402 } 4403 4404 // Emit an error if an address space was applied to decl with local storage. 4405 // This includes arrays of objects with address space qualifiers, but not 4406 // automatic variables that point to other address spaces. 4407 // ISO/IEC TR 18037 S5.1.2 4408 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4409 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4410 NewVD->setInvalidDecl(); 4411 return false; 4412 } 4413 4414 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4415 && !NewVD->hasAttr<BlocksAttr>()) { 4416 if (getLangOpts().getGC() != LangOptions::NonGC) 4417 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4418 else 4419 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4420 } 4421 4422 bool isVM = T->isVariablyModifiedType(); 4423 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4424 NewVD->hasAttr<BlocksAttr>()) 4425 getCurFunction()->setHasBranchProtectedScope(); 4426 4427 if ((isVM && NewVD->hasLinkage()) || 4428 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4429 bool SizeIsNegative; 4430 llvm::APSInt Oversized; 4431 QualType FixedTy = 4432 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4433 Oversized); 4434 4435 if (FixedTy.isNull() && T->isVariableArrayType()) { 4436 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4437 // FIXME: This won't give the correct result for 4438 // int a[10][n]; 4439 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4440 4441 if (NewVD->isFileVarDecl()) 4442 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4443 << SizeRange; 4444 else if (NewVD->getStorageClass() == SC_Static) 4445 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4446 << SizeRange; 4447 else 4448 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4449 << SizeRange; 4450 NewVD->setInvalidDecl(); 4451 return false; 4452 } 4453 4454 if (FixedTy.isNull()) { 4455 if (NewVD->isFileVarDecl()) 4456 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4457 else 4458 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4459 NewVD->setInvalidDecl(); 4460 return false; 4461 } 4462 4463 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4464 NewVD->setType(FixedTy); 4465 } 4466 4467 if (Previous.empty() && NewVD->isExternC()) { 4468 // Since we did not find anything by this name and we're declaring 4469 // an extern "C" variable, look for a non-visible extern "C" 4470 // declaration with the same name. 4471 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4472 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4473 if (Pos != LocallyScopedExternalDecls.end()) 4474 Previous.addDecl(Pos->second); 4475 } 4476 4477 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4478 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4479 << T; 4480 NewVD->setInvalidDecl(); 4481 return false; 4482 } 4483 4484 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4485 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4486 NewVD->setInvalidDecl(); 4487 return false; 4488 } 4489 4490 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4491 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4492 NewVD->setInvalidDecl(); 4493 return false; 4494 } 4495 4496 if (NewVD->isConstexpr() && !T->isDependentType() && 4497 RequireLiteralType(NewVD->getLocation(), T, 4498 diag::err_constexpr_var_non_literal)) { 4499 NewVD->setInvalidDecl(); 4500 return false; 4501 } 4502 4503 if (!Previous.empty()) { 4504 MergeVarDecl(NewVD, Previous); 4505 return true; 4506 } 4507 return false; 4508} 4509 4510/// \brief Data used with FindOverriddenMethod 4511struct FindOverriddenMethodData { 4512 Sema *S; 4513 CXXMethodDecl *Method; 4514}; 4515 4516/// \brief Member lookup function that determines whether a given C++ 4517/// method overrides a method in a base class, to be used with 4518/// CXXRecordDecl::lookupInBases(). 4519static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4520 CXXBasePath &Path, 4521 void *UserData) { 4522 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4523 4524 FindOverriddenMethodData *Data 4525 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4526 4527 DeclarationName Name = Data->Method->getDeclName(); 4528 4529 // FIXME: Do we care about other names here too? 4530 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4531 // We really want to find the base class destructor here. 4532 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4533 CanQualType CT = Data->S->Context.getCanonicalType(T); 4534 4535 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4536 } 4537 4538 for (Path.Decls = BaseRecord->lookup(Name); 4539 Path.Decls.first != Path.Decls.second; 4540 ++Path.Decls.first) { 4541 NamedDecl *D = *Path.Decls.first; 4542 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4543 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4544 return true; 4545 } 4546 } 4547 4548 return false; 4549} 4550 4551static bool hasDelayedExceptionSpec(CXXMethodDecl *Method) { 4552 const FunctionProtoType *Proto =Method->getType()->getAs<FunctionProtoType>(); 4553 return Proto && Proto->getExceptionSpecType() == EST_Delayed; 4554} 4555 4556/// AddOverriddenMethods - See if a method overrides any in the base classes, 4557/// and if so, check that it's a valid override and remember it. 4558bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4559 // Look for virtual methods in base classes that this method might override. 4560 CXXBasePaths Paths; 4561 FindOverriddenMethodData Data; 4562 Data.Method = MD; 4563 Data.S = this; 4564 bool AddedAny = false; 4565 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4566 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4567 E = Paths.found_decls_end(); I != E; ++I) { 4568 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4569 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4570 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4571 (hasDelayedExceptionSpec(MD) || 4572 !CheckOverridingFunctionExceptionSpec(MD, OldMD)) && 4573 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4574 AddedAny = true; 4575 } 4576 } 4577 } 4578 } 4579 4580 return AddedAny; 4581} 4582 4583namespace { 4584 // Struct for holding all of the extra arguments needed by 4585 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4586 struct ActOnFDArgs { 4587 Scope *S; 4588 Declarator &D; 4589 MultiTemplateParamsArg TemplateParamLists; 4590 bool AddToScope; 4591 }; 4592} 4593 4594namespace { 4595 4596// Callback to only accept typo corrections that have a non-zero edit distance. 4597// Also only accept corrections that have the same parent decl. 4598class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4599 public: 4600 DifferentNameValidatorCCC(CXXRecordDecl *Parent) 4601 : ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {} 4602 4603 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4604 if (candidate.getEditDistance() == 0) 4605 return false; 4606 4607 if (CXXMethodDecl *MD = candidate.getCorrectionDeclAs<CXXMethodDecl>()) { 4608 CXXRecordDecl *Parent = MD->getParent(); 4609 return Parent && Parent->getCanonicalDecl() == ExpectedParent; 4610 } 4611 4612 return !ExpectedParent; 4613 } 4614 4615 private: 4616 CXXRecordDecl *ExpectedParent; 4617}; 4618 4619} 4620 4621/// \brief Generate diagnostics for an invalid function redeclaration. 4622/// 4623/// This routine handles generating the diagnostic messages for an invalid 4624/// function redeclaration, including finding possible similar declarations 4625/// or performing typo correction if there are no previous declarations with 4626/// the same name. 4627/// 4628/// Returns a NamedDecl iff typo correction was performed and substituting in 4629/// the new declaration name does not cause new errors. 4630static NamedDecl* DiagnoseInvalidRedeclaration( 4631 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4632 ActOnFDArgs &ExtraArgs) { 4633 NamedDecl *Result = NULL; 4634 DeclarationName Name = NewFD->getDeclName(); 4635 DeclContext *NewDC = NewFD->getDeclContext(); 4636 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4637 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4638 llvm::SmallVector<unsigned, 1> MismatchedParams; 4639 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4640 TypoCorrection Correction; 4641 bool isFriendDecl = (SemaRef.getLangOpts().CPlusPlus && 4642 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4643 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4644 : diag::err_member_def_does_not_match; 4645 4646 NewFD->setInvalidDecl(); 4647 SemaRef.LookupQualifiedName(Prev, NewDC); 4648 assert(!Prev.isAmbiguous() && 4649 "Cannot have an ambiguity in previous-declaration lookup"); 4650 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 4651 DifferentNameValidatorCCC Validator(MD ? MD->getParent() : 0); 4652 if (!Prev.empty()) { 4653 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4654 Func != FuncEnd; ++Func) { 4655 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4656 if (FD && 4657 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4658 // Add 1 to the index so that 0 can mean the mismatch didn't 4659 // involve a parameter 4660 unsigned ParamNum = 4661 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4662 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4663 } 4664 } 4665 // If the qualified name lookup yielded nothing, try typo correction 4666 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4667 Prev.getLookupKind(), 0, 0, 4668 Validator, NewDC))) { 4669 // Trap errors. 4670 Sema::SFINAETrap Trap(SemaRef); 4671 4672 // Set up everything for the call to ActOnFunctionDeclarator 4673 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4674 ExtraArgs.D.getIdentifierLoc()); 4675 Previous.clear(); 4676 Previous.setLookupName(Correction.getCorrection()); 4677 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4678 CDeclEnd = Correction.end(); 4679 CDecl != CDeclEnd; ++CDecl) { 4680 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4681 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4682 MismatchedParams)) { 4683 Previous.addDecl(FD); 4684 } 4685 } 4686 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4687 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4688 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4689 // eliminate the need for the parameter pack ExtraArgs. 4690 Result = SemaRef.ActOnFunctionDeclarator( 4691 ExtraArgs.S, ExtraArgs.D, 4692 Correction.getCorrectionDecl()->getDeclContext(), 4693 NewFD->getTypeSourceInfo(), Previous, ExtraArgs.TemplateParamLists, 4694 ExtraArgs.AddToScope); 4695 if (Trap.hasErrorOccurred()) { 4696 // Pretend the typo correction never occurred 4697 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4698 ExtraArgs.D.getIdentifierLoc()); 4699 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4700 Previous.clear(); 4701 Previous.setLookupName(Name); 4702 Result = NULL; 4703 } else { 4704 for (LookupResult::iterator Func = Previous.begin(), 4705 FuncEnd = Previous.end(); 4706 Func != FuncEnd; ++Func) { 4707 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4708 NearMatches.push_back(std::make_pair(FD, 0)); 4709 } 4710 } 4711 if (NearMatches.empty()) { 4712 // Ignore the correction if it didn't yield any close FunctionDecl matches 4713 Correction = TypoCorrection(); 4714 } else { 4715 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4716 : diag::err_member_def_does_not_match_suggest; 4717 } 4718 } 4719 4720 if (Correction) 4721 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4722 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOpts()) 4723 << FixItHint::CreateReplacement( 4724 NewFD->getLocation(), 4725 Correction.getAsString(SemaRef.getLangOpts())); 4726 else 4727 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4728 << Name << NewDC << NewFD->getLocation(); 4729 4730 bool NewFDisConst = false; 4731 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4732 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4733 4734 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4735 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4736 NearMatch != NearMatchEnd; ++NearMatch) { 4737 FunctionDecl *FD = NearMatch->first; 4738 bool FDisConst = false; 4739 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4740 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4741 4742 if (unsigned Idx = NearMatch->second) { 4743 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4744 SourceLocation Loc = FDParam->getTypeSpecStartLoc(); 4745 if (Loc.isInvalid()) Loc = FD->getLocation(); 4746 SemaRef.Diag(Loc, diag::note_member_def_close_param_match) 4747 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4748 } else if (Correction) { 4749 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4750 << Correction.getQuoted(SemaRef.getLangOpts()); 4751 } else if (FDisConst != NewFDisConst) { 4752 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4753 << NewFDisConst << FD->getSourceRange().getEnd(); 4754 } else 4755 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4756 } 4757 return Result; 4758} 4759 4760static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4761 Declarator &D) { 4762 switch (D.getDeclSpec().getStorageClassSpec()) { 4763 default: llvm_unreachable("Unknown storage class!"); 4764 case DeclSpec::SCS_auto: 4765 case DeclSpec::SCS_register: 4766 case DeclSpec::SCS_mutable: 4767 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4768 diag::err_typecheck_sclass_func); 4769 D.setInvalidType(); 4770 break; 4771 case DeclSpec::SCS_unspecified: break; 4772 case DeclSpec::SCS_extern: return SC_Extern; 4773 case DeclSpec::SCS_static: { 4774 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4775 // C99 6.7.1p5: 4776 // The declaration of an identifier for a function that has 4777 // block scope shall have no explicit storage-class specifier 4778 // other than extern 4779 // See also (C++ [dcl.stc]p4). 4780 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4781 diag::err_static_block_func); 4782 break; 4783 } else 4784 return SC_Static; 4785 } 4786 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4787 } 4788 4789 // No explicit storage class has already been returned 4790 return SC_None; 4791} 4792 4793static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4794 DeclContext *DC, QualType &R, 4795 TypeSourceInfo *TInfo, 4796 FunctionDecl::StorageClass SC, 4797 bool &IsVirtualOkay) { 4798 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4799 DeclarationName Name = NameInfo.getName(); 4800 4801 FunctionDecl *NewFD = 0; 4802 bool isInline = D.getDeclSpec().isInlineSpecified(); 4803 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4804 FunctionDecl::StorageClass SCAsWritten 4805 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4806 4807 if (!SemaRef.getLangOpts().CPlusPlus) { 4808 // Determine whether the function was written with a 4809 // prototype. This true when: 4810 // - there is a prototype in the declarator, or 4811 // - the type R of the function is some kind of typedef or other reference 4812 // to a type name (which eventually refers to a function type). 4813 bool HasPrototype = 4814 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4815 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4816 4817 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4818 D.getLocStart(), NameInfo, R, 4819 TInfo, SC, SCAsWritten, isInline, 4820 HasPrototype); 4821 if (D.isInvalidType()) 4822 NewFD->setInvalidDecl(); 4823 4824 // Set the lexical context. 4825 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4826 4827 return NewFD; 4828 } 4829 4830 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4831 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4832 4833 // Check that the return type is not an abstract class type. 4834 // For record types, this is done by the AbstractClassUsageDiagnoser once 4835 // the class has been completely parsed. 4836 if (!DC->isRecord() && 4837 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4838 R->getAs<FunctionType>()->getResultType(), 4839 diag::err_abstract_type_in_decl, 4840 SemaRef.AbstractReturnType)) 4841 D.setInvalidType(); 4842 4843 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4844 // This is a C++ constructor declaration. 4845 assert(DC->isRecord() && 4846 "Constructors can only be declared in a member context"); 4847 4848 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4849 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4850 D.getLocStart(), NameInfo, 4851 R, TInfo, isExplicit, isInline, 4852 /*isImplicitlyDeclared=*/false, 4853 isConstexpr); 4854 4855 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4856 // This is a C++ destructor declaration. 4857 if (DC->isRecord()) { 4858 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4859 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4860 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4861 SemaRef.Context, Record, 4862 D.getLocStart(), 4863 NameInfo, R, TInfo, isInline, 4864 /*isImplicitlyDeclared=*/false); 4865 4866 // If the class is complete, then we now create the implicit exception 4867 // specification. If the class is incomplete or dependent, we can't do 4868 // it yet. 4869 if (SemaRef.getLangOpts().CPlusPlus0x && !Record->isDependentType() && 4870 Record->getDefinition() && !Record->isBeingDefined() && 4871 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4872 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4873 } 4874 4875 IsVirtualOkay = true; 4876 return NewDD; 4877 4878 } else { 4879 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4880 D.setInvalidType(); 4881 4882 // Create a FunctionDecl to satisfy the function definition parsing 4883 // code path. 4884 return FunctionDecl::Create(SemaRef.Context, DC, 4885 D.getLocStart(), 4886 D.getIdentifierLoc(), Name, R, TInfo, 4887 SC, SCAsWritten, isInline, 4888 /*hasPrototype=*/true, isConstexpr); 4889 } 4890 4891 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4892 if (!DC->isRecord()) { 4893 SemaRef.Diag(D.getIdentifierLoc(), 4894 diag::err_conv_function_not_member); 4895 return 0; 4896 } 4897 4898 SemaRef.CheckConversionDeclarator(D, R, SC); 4899 IsVirtualOkay = true; 4900 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4901 D.getLocStart(), NameInfo, 4902 R, TInfo, isInline, isExplicit, 4903 isConstexpr, SourceLocation()); 4904 4905 } else if (DC->isRecord()) { 4906 // If the name of the function is the same as the name of the record, 4907 // then this must be an invalid constructor that has a return type. 4908 // (The parser checks for a return type and makes the declarator a 4909 // constructor if it has no return type). 4910 if (Name.getAsIdentifierInfo() && 4911 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4912 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4913 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4914 << SourceRange(D.getIdentifierLoc()); 4915 return 0; 4916 } 4917 4918 bool isStatic = SC == SC_Static; 4919 4920 // [class.free]p1: 4921 // Any allocation function for a class T is a static member 4922 // (even if not explicitly declared static). 4923 if (Name.getCXXOverloadedOperator() == OO_New || 4924 Name.getCXXOverloadedOperator() == OO_Array_New) 4925 isStatic = true; 4926 4927 // [class.free]p6 Any deallocation function for a class X is a static member 4928 // (even if not explicitly declared static). 4929 if (Name.getCXXOverloadedOperator() == OO_Delete || 4930 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4931 isStatic = true; 4932 4933 IsVirtualOkay = !isStatic; 4934 4935 // This is a C++ method declaration. 4936 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4937 D.getLocStart(), NameInfo, R, 4938 TInfo, isStatic, SCAsWritten, isInline, 4939 isConstexpr, SourceLocation()); 4940 4941 } else { 4942 // Determine whether the function was written with a 4943 // prototype. This true when: 4944 // - we're in C++ (where every function has a prototype), 4945 return FunctionDecl::Create(SemaRef.Context, DC, 4946 D.getLocStart(), 4947 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4948 true/*HasPrototype*/, isConstexpr); 4949 } 4950} 4951 4952NamedDecl* 4953Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4954 TypeSourceInfo *TInfo, LookupResult &Previous, 4955 MultiTemplateParamsArg TemplateParamLists, 4956 bool &AddToScope) { 4957 QualType R = TInfo->getType(); 4958 4959 assert(R.getTypePtr()->isFunctionType()); 4960 4961 // TODO: consider using NameInfo for diagnostic. 4962 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4963 DeclarationName Name = NameInfo.getName(); 4964 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4965 4966 if (D.getDeclSpec().isThreadSpecified()) 4967 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4968 4969 // Do not allow returning a objc interface by-value. 4970 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4971 Diag(D.getIdentifierLoc(), 4972 diag::err_object_cannot_be_passed_returned_by_value) << 0 4973 << R->getAs<FunctionType>()->getResultType() 4974 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4975 4976 QualType T = R->getAs<FunctionType>()->getResultType(); 4977 T = Context.getObjCObjectPointerType(T); 4978 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4979 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4980 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4981 FPT->getNumArgs(), EPI); 4982 } 4983 else if (isa<FunctionNoProtoType>(R)) 4984 R = Context.getFunctionNoProtoType(T); 4985 } 4986 4987 bool isFriend = false; 4988 FunctionTemplateDecl *FunctionTemplate = 0; 4989 bool isExplicitSpecialization = false; 4990 bool isFunctionTemplateSpecialization = false; 4991 bool isDependentClassScopeExplicitSpecialization = false; 4992 bool isVirtualOkay = false; 4993 4994 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4995 isVirtualOkay); 4996 if (!NewFD) return 0; 4997 4998 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4999 NewFD->setTopLevelDeclInObjCContainer(); 5000 5001 if (getLangOpts().CPlusPlus) { 5002 bool isInline = D.getDeclSpec().isInlineSpecified(); 5003 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5004 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 5005 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 5006 isFriend = D.getDeclSpec().isFriendSpecified(); 5007 if (isFriend && !isInline && D.isFunctionDefinition()) { 5008 // C++ [class.friend]p5 5009 // A function can be defined in a friend declaration of a 5010 // class . . . . Such a function is implicitly inline. 5011 NewFD->setImplicitlyInline(); 5012 } 5013 5014 SetNestedNameSpecifier(NewFD, D); 5015 isExplicitSpecialization = false; 5016 isFunctionTemplateSpecialization = false; 5017 if (D.isInvalidType()) 5018 NewFD->setInvalidDecl(); 5019 5020 // Set the lexical context. If the declarator has a C++ 5021 // scope specifier, or is the object of a friend declaration, the 5022 // lexical context will be different from the semantic context. 5023 NewFD->setLexicalDeclContext(CurContext); 5024 5025 // Match up the template parameter lists with the scope specifier, then 5026 // determine whether we have a template or a template specialization. 5027 bool Invalid = false; 5028 if (TemplateParameterList *TemplateParams 5029 = MatchTemplateParametersToScopeSpecifier( 5030 D.getDeclSpec().getLocStart(), 5031 D.getIdentifierLoc(), 5032 D.getCXXScopeSpec(), 5033 TemplateParamLists.get(), 5034 TemplateParamLists.size(), 5035 isFriend, 5036 isExplicitSpecialization, 5037 Invalid)) { 5038 if (TemplateParams->size() > 0) { 5039 // This is a function template 5040 5041 // Check that we can declare a template here. 5042 if (CheckTemplateDeclScope(S, TemplateParams)) 5043 return 0; 5044 5045 // A destructor cannot be a template. 5046 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 5047 Diag(NewFD->getLocation(), diag::err_destructor_template); 5048 return 0; 5049 } 5050 5051 // If we're adding a template to a dependent context, we may need to 5052 // rebuilding some of the types used within the template parameter list, 5053 // now that we know what the current instantiation is. 5054 if (DC->isDependentContext()) { 5055 ContextRAII SavedContext(*this, DC); 5056 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 5057 Invalid = true; 5058 } 5059 5060 5061 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 5062 NewFD->getLocation(), 5063 Name, TemplateParams, 5064 NewFD); 5065 FunctionTemplate->setLexicalDeclContext(CurContext); 5066 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 5067 5068 // For source fidelity, store the other template param lists. 5069 if (TemplateParamLists.size() > 1) { 5070 NewFD->setTemplateParameterListsInfo(Context, 5071 TemplateParamLists.size() - 1, 5072 TemplateParamLists.release()); 5073 } 5074 } else { 5075 // This is a function template specialization. 5076 isFunctionTemplateSpecialization = true; 5077 // For source fidelity, store all the template param lists. 5078 NewFD->setTemplateParameterListsInfo(Context, 5079 TemplateParamLists.size(), 5080 TemplateParamLists.release()); 5081 5082 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 5083 if (isFriend) { 5084 // We want to remove the "template<>", found here. 5085 SourceRange RemoveRange = TemplateParams->getSourceRange(); 5086 5087 // If we remove the template<> and the name is not a 5088 // template-id, we're actually silently creating a problem: 5089 // the friend declaration will refer to an untemplated decl, 5090 // and clearly the user wants a template specialization. So 5091 // we need to insert '<>' after the name. 5092 SourceLocation InsertLoc; 5093 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 5094 InsertLoc = D.getName().getSourceRange().getEnd(); 5095 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 5096 } 5097 5098 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 5099 << Name << RemoveRange 5100 << FixItHint::CreateRemoval(RemoveRange) 5101 << FixItHint::CreateInsertion(InsertLoc, "<>"); 5102 } 5103 } 5104 } 5105 else { 5106 // All template param lists were matched against the scope specifier: 5107 // this is NOT (an explicit specialization of) a template. 5108 if (TemplateParamLists.size() > 0) 5109 // For source fidelity, store all the template param lists. 5110 NewFD->setTemplateParameterListsInfo(Context, 5111 TemplateParamLists.size(), 5112 TemplateParamLists.release()); 5113 } 5114 5115 if (Invalid) { 5116 NewFD->setInvalidDecl(); 5117 if (FunctionTemplate) 5118 FunctionTemplate->setInvalidDecl(); 5119 } 5120 5121 // If we see "T var();" at block scope, where T is a class type, it is 5122 // probably an attempt to initialize a variable, not a function declaration. 5123 // We don't catch this case earlier, since there is no ambiguity here. 5124 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 5125 CurContext->isFunctionOrMethod() && 5126 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 5127 D.getDeclSpec().getStorageClassSpecAsWritten() 5128 == DeclSpec::SCS_unspecified) { 5129 QualType T = R->getAs<FunctionType>()->getResultType(); 5130 DeclaratorChunk &C = D.getTypeObject(0); 5131 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 5132 !C.Fun.TrailingReturnType && 5133 C.Fun.getExceptionSpecType() == EST_None) { 5134 SourceRange ParenRange(C.Loc, C.EndLoc); 5135 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 5136 5137 // If the declaration looks like: 5138 // T var1, 5139 // f(); 5140 // and name lookup finds a function named 'f', then the ',' was 5141 // probably intended to be a ';'. 5142 if (!D.isFirstDeclarator() && D.getIdentifier()) { 5143 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 5144 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 5145 if (Comma.getFileID() != Name.getFileID() || 5146 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 5147 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 5148 LookupOrdinaryName); 5149 if (LookupName(Result, S)) 5150 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 5151 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 5152 } 5153 } 5154 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 5155 // Empty parens mean value-initialization, and no parens mean default 5156 // initialization. These are equivalent if the default constructor is 5157 // user-provided, or if zero-initialization is a no-op. 5158 if (RD && RD->hasDefinition() && 5159 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 5160 Diag(C.Loc, diag::note_empty_parens_default_ctor) 5161 << FixItHint::CreateRemoval(ParenRange); 5162 else { 5163 std::string Init = getFixItZeroInitializerForType(T); 5164 if (Init.empty() && LangOpts.CPlusPlus0x) 5165 Init = "{}"; 5166 if (!Init.empty()) 5167 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5168 << FixItHint::CreateReplacement(ParenRange, Init); 5169 } 5170 } 5171 } 5172 5173 // C++ [dcl.fct.spec]p5: 5174 // The virtual specifier shall only be used in declarations of 5175 // nonstatic class member functions that appear within a 5176 // member-specification of a class declaration; see 10.3. 5177 // 5178 if (isVirtual && !NewFD->isInvalidDecl()) { 5179 if (!isVirtualOkay) { 5180 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5181 diag::err_virtual_non_function); 5182 } else if (!CurContext->isRecord()) { 5183 // 'virtual' was specified outside of the class. 5184 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5185 diag::err_virtual_out_of_class) 5186 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5187 } else if (NewFD->getDescribedFunctionTemplate()) { 5188 // C++ [temp.mem]p3: 5189 // A member function template shall not be virtual. 5190 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5191 diag::err_virtual_member_function_template) 5192 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5193 } else { 5194 // Okay: Add virtual to the method. 5195 NewFD->setVirtualAsWritten(true); 5196 } 5197 } 5198 5199 // C++ [dcl.fct.spec]p3: 5200 // The inline specifier shall not appear on a block scope function 5201 // declaration. 5202 if (isInline && !NewFD->isInvalidDecl()) { 5203 if (CurContext->isFunctionOrMethod()) { 5204 // 'inline' is not allowed on block scope function declaration. 5205 Diag(D.getDeclSpec().getInlineSpecLoc(), 5206 diag::err_inline_declaration_block_scope) << Name 5207 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5208 } 5209 } 5210 5211 // C++ [dcl.fct.spec]p6: 5212 // The explicit specifier shall be used only in the declaration of a 5213 // constructor or conversion function within its class definition; 5214 // see 12.3.1 and 12.3.2. 5215 if (isExplicit && !NewFD->isInvalidDecl()) { 5216 if (!CurContext->isRecord()) { 5217 // 'explicit' was specified outside of the class. 5218 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5219 diag::err_explicit_out_of_class) 5220 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5221 } else if (!isa<CXXConstructorDecl>(NewFD) && 5222 !isa<CXXConversionDecl>(NewFD)) { 5223 // 'explicit' was specified on a function that wasn't a constructor 5224 // or conversion function. 5225 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5226 diag::err_explicit_non_ctor_or_conv_function) 5227 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5228 } 5229 } 5230 5231 if (isConstexpr) { 5232 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5233 // are implicitly inline. 5234 NewFD->setImplicitlyInline(); 5235 5236 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5237 // be either constructors or to return a literal type. Therefore, 5238 // destructors cannot be declared constexpr. 5239 if (isa<CXXDestructorDecl>(NewFD)) 5240 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5241 } 5242 5243 // If __module_private__ was specified, mark the function accordingly. 5244 if (D.getDeclSpec().isModulePrivateSpecified()) { 5245 if (isFunctionTemplateSpecialization) { 5246 SourceLocation ModulePrivateLoc 5247 = D.getDeclSpec().getModulePrivateSpecLoc(); 5248 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5249 << 0 5250 << FixItHint::CreateRemoval(ModulePrivateLoc); 5251 } else { 5252 NewFD->setModulePrivate(); 5253 if (FunctionTemplate) 5254 FunctionTemplate->setModulePrivate(); 5255 } 5256 } 5257 5258 if (isFriend) { 5259 // For now, claim that the objects have no previous declaration. 5260 if (FunctionTemplate) { 5261 FunctionTemplate->setObjectOfFriendDecl(false); 5262 FunctionTemplate->setAccess(AS_public); 5263 } 5264 NewFD->setObjectOfFriendDecl(false); 5265 NewFD->setAccess(AS_public); 5266 } 5267 5268 // If a function is defined as defaulted or deleted, mark it as such now. 5269 switch (D.getFunctionDefinitionKind()) { 5270 case FDK_Declaration: 5271 case FDK_Definition: 5272 break; 5273 5274 case FDK_Defaulted: 5275 NewFD->setDefaulted(); 5276 break; 5277 5278 case FDK_Deleted: 5279 NewFD->setDeletedAsWritten(); 5280 break; 5281 } 5282 5283 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5284 D.isFunctionDefinition()) { 5285 // C++ [class.mfct]p2: 5286 // A member function may be defined (8.4) in its class definition, in 5287 // which case it is an inline member function (7.1.2) 5288 NewFD->setImplicitlyInline(); 5289 } 5290 5291 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5292 !CurContext->isRecord()) { 5293 // C++ [class.static]p1: 5294 // A data or function member of a class may be declared static 5295 // in a class definition, in which case it is a static member of 5296 // the class. 5297 5298 // Complain about the 'static' specifier if it's on an out-of-line 5299 // member function definition. 5300 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5301 diag::err_static_out_of_line) 5302 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5303 } 5304 } 5305 5306 // Filter out previous declarations that don't match the scope. 5307 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5308 isExplicitSpecialization || 5309 isFunctionTemplateSpecialization); 5310 5311 // Handle GNU asm-label extension (encoded as an attribute). 5312 if (Expr *E = (Expr*) D.getAsmLabel()) { 5313 // The parser guarantees this is a string. 5314 StringLiteral *SE = cast<StringLiteral>(E); 5315 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5316 SE->getString())); 5317 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 5318 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 5319 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); 5320 if (I != ExtnameUndeclaredIdentifiers.end()) { 5321 NewFD->addAttr(I->second); 5322 ExtnameUndeclaredIdentifiers.erase(I); 5323 } 5324 } 5325 5326 // Copy the parameter declarations from the declarator D to the function 5327 // declaration NewFD, if they are available. First scavenge them into Params. 5328 SmallVector<ParmVarDecl*, 16> Params; 5329 if (D.isFunctionDeclarator()) { 5330 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5331 5332 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5333 // function that takes no arguments, not a function that takes a 5334 // single void argument. 5335 // We let through "const void" here because Sema::GetTypeForDeclarator 5336 // already checks for that case. 5337 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5338 FTI.ArgInfo[0].Param && 5339 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5340 // Empty arg list, don't push any params. 5341 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5342 5343 // In C++, the empty parameter-type-list must be spelled "void"; a 5344 // typedef of void is not permitted. 5345 if (getLangOpts().CPlusPlus && 5346 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5347 bool IsTypeAlias = false; 5348 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5349 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5350 else if (const TemplateSpecializationType *TST = 5351 Param->getType()->getAs<TemplateSpecializationType>()) 5352 IsTypeAlias = TST->isTypeAlias(); 5353 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5354 << IsTypeAlias; 5355 } 5356 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5357 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5358 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5359 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5360 Param->setDeclContext(NewFD); 5361 Params.push_back(Param); 5362 5363 if (Param->isInvalidDecl()) 5364 NewFD->setInvalidDecl(); 5365 } 5366 } 5367 5368 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5369 // When we're declaring a function with a typedef, typeof, etc as in the 5370 // following example, we'll need to synthesize (unnamed) 5371 // parameters for use in the declaration. 5372 // 5373 // @code 5374 // typedef void fn(int); 5375 // fn f; 5376 // @endcode 5377 5378 // Synthesize a parameter for each argument type. 5379 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5380 AE = FT->arg_type_end(); AI != AE; ++AI) { 5381 ParmVarDecl *Param = 5382 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5383 Param->setScopeInfo(0, Params.size()); 5384 Params.push_back(Param); 5385 } 5386 } else { 5387 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5388 "Should not need args for typedef of non-prototype fn"); 5389 } 5390 5391 // Finally, we know we have the right number of parameters, install them. 5392 NewFD->setParams(Params); 5393 5394 // Find all anonymous symbols defined during the declaration of this function 5395 // and add to NewFD. This lets us track decls such 'enum Y' in: 5396 // 5397 // void f(enum Y {AA} x) {} 5398 // 5399 // which would otherwise incorrectly end up in the translation unit scope. 5400 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope); 5401 DeclsInPrototypeScope.clear(); 5402 5403 // Process the non-inheritable attributes on this declaration. 5404 ProcessDeclAttributes(S, NewFD, D, 5405 /*NonInheritable=*/true, /*Inheritable=*/false); 5406 5407 // Functions returning a variably modified type violate C99 6.7.5.2p2 5408 // because all functions have linkage. 5409 if (!NewFD->isInvalidDecl() && 5410 NewFD->getResultType()->isVariablyModifiedType()) { 5411 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5412 NewFD->setInvalidDecl(); 5413 } 5414 5415 // Handle attributes. 5416 ProcessDeclAttributes(S, NewFD, D, 5417 /*NonInheritable=*/false, /*Inheritable=*/true); 5418 5419 if (!getLangOpts().CPlusPlus) { 5420 // Perform semantic checking on the function declaration. 5421 bool isExplicitSpecialization=false; 5422 if (!NewFD->isInvalidDecl()) { 5423 if (NewFD->isMain()) 5424 CheckMain(NewFD, D.getDeclSpec()); 5425 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5426 isExplicitSpecialization)); 5427 } 5428 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5429 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5430 "previous declaration set still overloaded"); 5431 } else { 5432 // If the declarator is a template-id, translate the parser's template 5433 // argument list into our AST format. 5434 bool HasExplicitTemplateArgs = false; 5435 TemplateArgumentListInfo TemplateArgs; 5436 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5437 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5438 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5439 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5440 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5441 TemplateId->getTemplateArgs(), 5442 TemplateId->NumArgs); 5443 translateTemplateArguments(TemplateArgsPtr, 5444 TemplateArgs); 5445 TemplateArgsPtr.release(); 5446 5447 HasExplicitTemplateArgs = true; 5448 5449 if (NewFD->isInvalidDecl()) { 5450 HasExplicitTemplateArgs = false; 5451 } else if (FunctionTemplate) { 5452 // Function template with explicit template arguments. 5453 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5454 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5455 5456 HasExplicitTemplateArgs = false; 5457 } else if (!isFunctionTemplateSpecialization && 5458 !D.getDeclSpec().isFriendSpecified()) { 5459 // We have encountered something that the user meant to be a 5460 // specialization (because it has explicitly-specified template 5461 // arguments) but that was not introduced with a "template<>" (or had 5462 // too few of them). 5463 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5464 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5465 << FixItHint::CreateInsertion( 5466 D.getDeclSpec().getLocStart(), 5467 "template<> "); 5468 isFunctionTemplateSpecialization = true; 5469 } else { 5470 // "friend void foo<>(int);" is an implicit specialization decl. 5471 isFunctionTemplateSpecialization = true; 5472 } 5473 } else if (isFriend && isFunctionTemplateSpecialization) { 5474 // This combination is only possible in a recovery case; the user 5475 // wrote something like: 5476 // template <> friend void foo(int); 5477 // which we're recovering from as if the user had written: 5478 // friend void foo<>(int); 5479 // Go ahead and fake up a template id. 5480 HasExplicitTemplateArgs = true; 5481 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5482 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5483 } 5484 5485 // If it's a friend (and only if it's a friend), it's possible 5486 // that either the specialized function type or the specialized 5487 // template is dependent, and therefore matching will fail. In 5488 // this case, don't check the specialization yet. 5489 bool InstantiationDependent = false; 5490 if (isFunctionTemplateSpecialization && isFriend && 5491 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5492 TemplateSpecializationType::anyDependentTemplateArguments( 5493 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5494 InstantiationDependent))) { 5495 assert(HasExplicitTemplateArgs && 5496 "friend function specialization without template args"); 5497 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5498 Previous)) 5499 NewFD->setInvalidDecl(); 5500 } else if (isFunctionTemplateSpecialization) { 5501 if (CurContext->isDependentContext() && CurContext->isRecord() 5502 && !isFriend) { 5503 isDependentClassScopeExplicitSpecialization = true; 5504 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ? 5505 diag::ext_function_specialization_in_class : 5506 diag::err_function_specialization_in_class) 5507 << NewFD->getDeclName(); 5508 } else if (CheckFunctionTemplateSpecialization(NewFD, 5509 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5510 Previous)) 5511 NewFD->setInvalidDecl(); 5512 5513 // C++ [dcl.stc]p1: 5514 // A storage-class-specifier shall not be specified in an explicit 5515 // specialization (14.7.3) 5516 if (SC != SC_None) { 5517 if (SC != NewFD->getStorageClass()) 5518 Diag(NewFD->getLocation(), 5519 diag::err_explicit_specialization_inconsistent_storage_class) 5520 << SC 5521 << FixItHint::CreateRemoval( 5522 D.getDeclSpec().getStorageClassSpecLoc()); 5523 5524 else 5525 Diag(NewFD->getLocation(), 5526 diag::ext_explicit_specialization_storage_class) 5527 << FixItHint::CreateRemoval( 5528 D.getDeclSpec().getStorageClassSpecLoc()); 5529 } 5530 5531 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5532 if (CheckMemberSpecialization(NewFD, Previous)) 5533 NewFD->setInvalidDecl(); 5534 } 5535 5536 // Perform semantic checking on the function declaration. 5537 if (!isDependentClassScopeExplicitSpecialization) { 5538 if (NewFD->isInvalidDecl()) { 5539 // If this is a class member, mark the class invalid immediately. 5540 // This avoids some consistency errors later. 5541 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5542 methodDecl->getParent()->setInvalidDecl(); 5543 } else { 5544 if (NewFD->isMain()) 5545 CheckMain(NewFD, D.getDeclSpec()); 5546 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5547 isExplicitSpecialization)); 5548 } 5549 } 5550 5551 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5552 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5553 "previous declaration set still overloaded"); 5554 5555 NamedDecl *PrincipalDecl = (FunctionTemplate 5556 ? cast<NamedDecl>(FunctionTemplate) 5557 : NewFD); 5558 5559 if (isFriend && D.isRedeclaration()) { 5560 AccessSpecifier Access = AS_public; 5561 if (!NewFD->isInvalidDecl()) 5562 Access = NewFD->getPreviousDecl()->getAccess(); 5563 5564 NewFD->setAccess(Access); 5565 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5566 5567 PrincipalDecl->setObjectOfFriendDecl(true); 5568 } 5569 5570 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5571 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5572 PrincipalDecl->setNonMemberOperator(); 5573 5574 // If we have a function template, check the template parameter 5575 // list. This will check and merge default template arguments. 5576 if (FunctionTemplate) { 5577 FunctionTemplateDecl *PrevTemplate = 5578 FunctionTemplate->getPreviousDecl(); 5579 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5580 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5581 D.getDeclSpec().isFriendSpecified() 5582 ? (D.isFunctionDefinition() 5583 ? TPC_FriendFunctionTemplateDefinition 5584 : TPC_FriendFunctionTemplate) 5585 : (D.getCXXScopeSpec().isSet() && 5586 DC && DC->isRecord() && 5587 DC->isDependentContext()) 5588 ? TPC_ClassTemplateMember 5589 : TPC_FunctionTemplate); 5590 } 5591 5592 if (NewFD->isInvalidDecl()) { 5593 // Ignore all the rest of this. 5594 } else if (!D.isRedeclaration()) { 5595 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5596 AddToScope }; 5597 // Fake up an access specifier if it's supposed to be a class member. 5598 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5599 NewFD->setAccess(AS_public); 5600 5601 // Qualified decls generally require a previous declaration. 5602 if (D.getCXXScopeSpec().isSet()) { 5603 // ...with the major exception of templated-scope or 5604 // dependent-scope friend declarations. 5605 5606 // TODO: we currently also suppress this check in dependent 5607 // contexts because (1) the parameter depth will be off when 5608 // matching friend templates and (2) we might actually be 5609 // selecting a friend based on a dependent factor. But there 5610 // are situations where these conditions don't apply and we 5611 // can actually do this check immediately. 5612 if (isFriend && 5613 (TemplateParamLists.size() || 5614 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5615 CurContext->isDependentContext())) { 5616 // ignore these 5617 } else { 5618 // The user tried to provide an out-of-line definition for a 5619 // function that is a member of a class or namespace, but there 5620 // was no such member function declared (C++ [class.mfct]p2, 5621 // C++ [namespace.memdef]p2). For example: 5622 // 5623 // class X { 5624 // void f() const; 5625 // }; 5626 // 5627 // void X::f() { } // ill-formed 5628 // 5629 // Complain about this problem, and attempt to suggest close 5630 // matches (e.g., those that differ only in cv-qualifiers and 5631 // whether the parameter types are references). 5632 5633 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5634 NewFD, 5635 ExtraArgs)) { 5636 AddToScope = ExtraArgs.AddToScope; 5637 return Result; 5638 } 5639 } 5640 5641 // Unqualified local friend declarations are required to resolve 5642 // to something. 5643 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5644 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5645 NewFD, 5646 ExtraArgs)) { 5647 AddToScope = ExtraArgs.AddToScope; 5648 return Result; 5649 } 5650 } 5651 5652 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5653 !isFriend && !isFunctionTemplateSpecialization && 5654 !isExplicitSpecialization) { 5655 // An out-of-line member function declaration must also be a 5656 // definition (C++ [dcl.meaning]p1). 5657 // Note that this is not the case for explicit specializations of 5658 // function templates or member functions of class templates, per 5659 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5660 // extension for compatibility with old SWIG code which likes to 5661 // generate them. 5662 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5663 << D.getCXXScopeSpec().getRange(); 5664 } 5665 } 5666 5667 // attributes declared post-definition are currently ignored 5668 // FIXME: This should happen during attribute merging 5669 if (D.isRedeclaration() && Previous.isSingleResult()) { 5670 const FunctionDecl *Def; 5671 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5672 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5673 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5674 Diag(Def->getLocation(), diag::note_previous_definition); 5675 } 5676 } 5677 5678 AddKnownFunctionAttributes(NewFD); 5679 5680 if (NewFD->hasAttr<OverloadableAttr>() && 5681 !NewFD->getType()->getAs<FunctionProtoType>()) { 5682 Diag(NewFD->getLocation(), 5683 diag::err_attribute_overloadable_no_prototype) 5684 << NewFD; 5685 5686 // Turn this into a variadic function with no parameters. 5687 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5688 FunctionProtoType::ExtProtoInfo EPI; 5689 EPI.Variadic = true; 5690 EPI.ExtInfo = FT->getExtInfo(); 5691 5692 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5693 NewFD->setType(R); 5694 } 5695 5696 // If there's a #pragma GCC visibility in scope, and this isn't a class 5697 // member, set the visibility of this function. 5698 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5699 AddPushedVisibilityAttribute(NewFD); 5700 5701 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5702 // marking the function. 5703 AddCFAuditedAttribute(NewFD); 5704 5705 // If this is a locally-scoped extern C function, update the 5706 // map of such names. 5707 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5708 && !NewFD->isInvalidDecl()) 5709 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5710 5711 // Set this FunctionDecl's range up to the right paren. 5712 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5713 5714 if (getLangOpts().CPlusPlus) { 5715 if (FunctionTemplate) { 5716 if (NewFD->isInvalidDecl()) 5717 FunctionTemplate->setInvalidDecl(); 5718 return FunctionTemplate; 5719 } 5720 } 5721 5722 MarkUnusedFileScopedDecl(NewFD); 5723 5724 if (getLangOpts().CUDA) 5725 if (IdentifierInfo *II = NewFD->getIdentifier()) 5726 if (!NewFD->isInvalidDecl() && 5727 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5728 if (II->isStr("cudaConfigureCall")) { 5729 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5730 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5731 5732 Context.setcudaConfigureCallDecl(NewFD); 5733 } 5734 } 5735 5736 // Here we have an function template explicit specialization at class scope. 5737 // The actually specialization will be postponed to template instatiation 5738 // time via the ClassScopeFunctionSpecializationDecl node. 5739 if (isDependentClassScopeExplicitSpecialization) { 5740 ClassScopeFunctionSpecializationDecl *NewSpec = 5741 ClassScopeFunctionSpecializationDecl::Create( 5742 Context, CurContext, SourceLocation(), 5743 cast<CXXMethodDecl>(NewFD)); 5744 CurContext->addDecl(NewSpec); 5745 AddToScope = false; 5746 } 5747 5748 return NewFD; 5749} 5750 5751/// \brief Perform semantic checking of a new function declaration. 5752/// 5753/// Performs semantic analysis of the new function declaration 5754/// NewFD. This routine performs all semantic checking that does not 5755/// require the actual declarator involved in the declaration, and is 5756/// used both for the declaration of functions as they are parsed 5757/// (called via ActOnDeclarator) and for the declaration of functions 5758/// that have been instantiated via C++ template instantiation (called 5759/// via InstantiateDecl). 5760/// 5761/// \param IsExplicitSpecialiation whether this new function declaration is 5762/// an explicit specialization of the previous declaration. 5763/// 5764/// This sets NewFD->isInvalidDecl() to true if there was an error. 5765/// 5766/// Returns true if the function declaration is a redeclaration. 5767bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5768 LookupResult &Previous, 5769 bool IsExplicitSpecialization) { 5770 assert(!NewFD->getResultType()->isVariablyModifiedType() 5771 && "Variably modified return types are not handled here"); 5772 5773 // Check for a previous declaration of this name. 5774 if (Previous.empty() && NewFD->isExternC()) { 5775 // Since we did not find anything by this name and we're declaring 5776 // an extern "C" function, look for a non-visible extern "C" 5777 // declaration with the same name. 5778 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5779 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5780 if (Pos != LocallyScopedExternalDecls.end()) 5781 Previous.addDecl(Pos->second); 5782 } 5783 5784 bool Redeclaration = false; 5785 5786 // Merge or overload the declaration with an existing declaration of 5787 // the same name, if appropriate. 5788 if (!Previous.empty()) { 5789 // Determine whether NewFD is an overload of PrevDecl or 5790 // a declaration that requires merging. If it's an overload, 5791 // there's no more work to do here; we'll just add the new 5792 // function to the scope. 5793 5794 NamedDecl *OldDecl = 0; 5795 if (!AllowOverloadingOfFunction(Previous, Context)) { 5796 Redeclaration = true; 5797 OldDecl = Previous.getFoundDecl(); 5798 } else { 5799 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5800 /*NewIsUsingDecl*/ false)) { 5801 case Ovl_Match: 5802 Redeclaration = true; 5803 break; 5804 5805 case Ovl_NonFunction: 5806 Redeclaration = true; 5807 break; 5808 5809 case Ovl_Overload: 5810 Redeclaration = false; 5811 break; 5812 } 5813 5814 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5815 // If a function name is overloadable in C, then every function 5816 // with that name must be marked "overloadable". 5817 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5818 << Redeclaration << NewFD; 5819 NamedDecl *OverloadedDecl = 0; 5820 if (Redeclaration) 5821 OverloadedDecl = OldDecl; 5822 else if (!Previous.empty()) 5823 OverloadedDecl = Previous.getRepresentativeDecl(); 5824 if (OverloadedDecl) 5825 Diag(OverloadedDecl->getLocation(), 5826 diag::note_attribute_overloadable_prev_overload); 5827 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5828 Context)); 5829 } 5830 } 5831 5832 if (Redeclaration) { 5833 // NewFD and OldDecl represent declarations that need to be 5834 // merged. 5835 if (MergeFunctionDecl(NewFD, OldDecl, S)) { 5836 NewFD->setInvalidDecl(); 5837 return Redeclaration; 5838 } 5839 5840 Previous.clear(); 5841 Previous.addDecl(OldDecl); 5842 5843 if (FunctionTemplateDecl *OldTemplateDecl 5844 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5845 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5846 FunctionTemplateDecl *NewTemplateDecl 5847 = NewFD->getDescribedFunctionTemplate(); 5848 assert(NewTemplateDecl && "Template/non-template mismatch"); 5849 if (CXXMethodDecl *Method 5850 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5851 Method->setAccess(OldTemplateDecl->getAccess()); 5852 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5853 } 5854 5855 // If this is an explicit specialization of a member that is a function 5856 // template, mark it as a member specialization. 5857 if (IsExplicitSpecialization && 5858 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5859 NewTemplateDecl->setMemberSpecialization(); 5860 assert(OldTemplateDecl->isMemberSpecialization()); 5861 } 5862 5863 } else { 5864 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5865 NewFD->setAccess(OldDecl->getAccess()); 5866 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5867 } 5868 } 5869 } 5870 5871 // Semantic checking for this function declaration (in isolation). 5872 if (getLangOpts().CPlusPlus) { 5873 // C++-specific checks. 5874 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5875 CheckConstructor(Constructor); 5876 } else if (CXXDestructorDecl *Destructor = 5877 dyn_cast<CXXDestructorDecl>(NewFD)) { 5878 CXXRecordDecl *Record = Destructor->getParent(); 5879 QualType ClassType = Context.getTypeDeclType(Record); 5880 5881 // FIXME: Shouldn't we be able to perform this check even when the class 5882 // type is dependent? Both gcc and edg can handle that. 5883 if (!ClassType->isDependentType()) { 5884 DeclarationName Name 5885 = Context.DeclarationNames.getCXXDestructorName( 5886 Context.getCanonicalType(ClassType)); 5887 if (NewFD->getDeclName() != Name) { 5888 Diag(NewFD->getLocation(), diag::err_destructor_name); 5889 NewFD->setInvalidDecl(); 5890 return Redeclaration; 5891 } 5892 } 5893 } else if (CXXConversionDecl *Conversion 5894 = dyn_cast<CXXConversionDecl>(NewFD)) { 5895 ActOnConversionDeclarator(Conversion); 5896 } 5897 5898 // Find any virtual functions that this function overrides. 5899 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5900 if (!Method->isFunctionTemplateSpecialization() && 5901 !Method->getDescribedFunctionTemplate()) { 5902 if (AddOverriddenMethods(Method->getParent(), Method)) { 5903 // If the function was marked as "static", we have a problem. 5904 if (NewFD->getStorageClass() == SC_Static) { 5905 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5906 << NewFD->getDeclName(); 5907 for (CXXMethodDecl::method_iterator 5908 Overridden = Method->begin_overridden_methods(), 5909 OverriddenEnd = Method->end_overridden_methods(); 5910 Overridden != OverriddenEnd; 5911 ++Overridden) { 5912 Diag((*Overridden)->getLocation(), 5913 diag::note_overridden_virtual_function); 5914 } 5915 } 5916 } 5917 } 5918 5919 if (Method->isStatic()) 5920 checkThisInStaticMemberFunctionType(Method); 5921 } 5922 5923 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5924 if (NewFD->isOverloadedOperator() && 5925 CheckOverloadedOperatorDeclaration(NewFD)) { 5926 NewFD->setInvalidDecl(); 5927 return Redeclaration; 5928 } 5929 5930 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5931 if (NewFD->getLiteralIdentifier() && 5932 CheckLiteralOperatorDeclaration(NewFD)) { 5933 NewFD->setInvalidDecl(); 5934 return Redeclaration; 5935 } 5936 5937 // In C++, check default arguments now that we have merged decls. Unless 5938 // the lexical context is the class, because in this case this is done 5939 // during delayed parsing anyway. 5940 if (!CurContext->isRecord()) 5941 CheckCXXDefaultArguments(NewFD); 5942 5943 // If this function declares a builtin function, check the type of this 5944 // declaration against the expected type for the builtin. 5945 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5946 ASTContext::GetBuiltinTypeError Error; 5947 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5948 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5949 // The type of this function differs from the type of the builtin, 5950 // so forget about the builtin entirely. 5951 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5952 } 5953 } 5954 5955 // If this function is declared as being extern "C", then check to see if 5956 // the function returns a UDT (class, struct, or union type) that is not C 5957 // compatible, and if it does, warn the user. 5958 if (NewFD->isExternC()) { 5959 QualType R = NewFD->getResultType(); 5960 if (!R.isPODType(Context) && 5961 !R->isVoidType()) 5962 Diag( NewFD->getLocation(), diag::warn_return_value_udt ) 5963 << NewFD << R; 5964 } 5965 } 5966 return Redeclaration; 5967} 5968 5969void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5970 // C++11 [basic.start.main]p3: A program that declares main to be inline, 5971 // static or constexpr is ill-formed. 5972 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5973 // shall not appear in a declaration of main. 5974 // static main is not an error under C99, but we should warn about it. 5975 if (FD->getStorageClass() == SC_Static) 5976 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus 5977 ? diag::err_static_main : diag::warn_static_main) 5978 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5979 if (FD->isInlineSpecified()) 5980 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5981 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5982 if (FD->isConstexpr()) { 5983 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 5984 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 5985 FD->setConstexpr(false); 5986 } 5987 5988 QualType T = FD->getType(); 5989 assert(T->isFunctionType() && "function decl is not of function type"); 5990 const FunctionType* FT = T->castAs<FunctionType>(); 5991 5992 // All the standards say that main() should should return 'int'. 5993 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5994 // In C and C++, main magically returns 0 if you fall off the end; 5995 // set the flag which tells us that. 5996 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5997 FD->setHasImplicitReturnZero(true); 5998 5999 // In C with GNU extensions we allow main() to have non-integer return 6000 // type, but we should warn about the extension, and we disable the 6001 // implicit-return-zero rule. 6002 } else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) { 6003 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); 6004 6005 // Otherwise, this is just a flat-out error. 6006 } else { 6007 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 6008 FD->setInvalidDecl(true); 6009 } 6010 6011 // Treat protoless main() as nullary. 6012 if (isa<FunctionNoProtoType>(FT)) return; 6013 6014 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 6015 unsigned nparams = FTP->getNumArgs(); 6016 assert(FD->getNumParams() == nparams); 6017 6018 bool HasExtraParameters = (nparams > 3); 6019 6020 // Darwin passes an undocumented fourth argument of type char**. If 6021 // other platforms start sprouting these, the logic below will start 6022 // getting shifty. 6023 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 6024 HasExtraParameters = false; 6025 6026 if (HasExtraParameters) { 6027 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 6028 FD->setInvalidDecl(true); 6029 nparams = 3; 6030 } 6031 6032 // FIXME: a lot of the following diagnostics would be improved 6033 // if we had some location information about types. 6034 6035 QualType CharPP = 6036 Context.getPointerType(Context.getPointerType(Context.CharTy)); 6037 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 6038 6039 for (unsigned i = 0; i < nparams; ++i) { 6040 QualType AT = FTP->getArgType(i); 6041 6042 bool mismatch = true; 6043 6044 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 6045 mismatch = false; 6046 else if (Expected[i] == CharPP) { 6047 // As an extension, the following forms are okay: 6048 // char const ** 6049 // char const * const * 6050 // char * const * 6051 6052 QualifierCollector qs; 6053 const PointerType* PT; 6054 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 6055 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 6056 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 6057 qs.removeConst(); 6058 mismatch = !qs.empty(); 6059 } 6060 } 6061 6062 if (mismatch) { 6063 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 6064 // TODO: suggest replacing given type with expected type 6065 FD->setInvalidDecl(true); 6066 } 6067 } 6068 6069 if (nparams == 1 && !FD->isInvalidDecl()) { 6070 Diag(FD->getLocation(), diag::warn_main_one_arg); 6071 } 6072 6073 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 6074 Diag(FD->getLocation(), diag::err_main_template_decl); 6075 FD->setInvalidDecl(); 6076 } 6077} 6078 6079bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 6080 // FIXME: Need strict checking. In C89, we need to check for 6081 // any assignment, increment, decrement, function-calls, or 6082 // commas outside of a sizeof. In C99, it's the same list, 6083 // except that the aforementioned are allowed in unevaluated 6084 // expressions. Everything else falls under the 6085 // "may accept other forms of constant expressions" exception. 6086 // (We never end up here for C++, so the constant expression 6087 // rules there don't matter.) 6088 if (Init->isConstantInitializer(Context, false)) 6089 return false; 6090 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 6091 << Init->getSourceRange(); 6092 return true; 6093} 6094 6095namespace { 6096 // Visits an initialization expression to see if OrigDecl is evaluated in 6097 // its own initialization and throws a warning if it does. 6098 class SelfReferenceChecker 6099 : public EvaluatedExprVisitor<SelfReferenceChecker> { 6100 Sema &S; 6101 Decl *OrigDecl; 6102 bool isRecordType; 6103 bool isPODType; 6104 6105 public: 6106 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 6107 6108 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 6109 S(S), OrigDecl(OrigDecl) { 6110 isPODType = false; 6111 isRecordType = false; 6112 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 6113 isPODType = VD->getType().isPODType(S.Context); 6114 isRecordType = VD->getType()->isRecordType(); 6115 } 6116 } 6117 6118 // Sometimes, the expression passed in lacks the casts that are used 6119 // to determine which DeclRefExpr's to check. Assume that the casts 6120 // are present and continue visiting the expression. 6121 void HandleExpr(Expr *E) { 6122 // Skip checking T a = a where T is not a record type. Doing so is a 6123 // way to silence uninitialized warnings. 6124 if (isRecordType) 6125 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 6126 HandleDeclRefExpr(DRE); 6127 6128 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 6129 HandleValue(CO->getTrueExpr()); 6130 HandleValue(CO->getFalseExpr()); 6131 } 6132 6133 Visit(E); 6134 } 6135 6136 // For most expressions, the cast is directly above the DeclRefExpr. 6137 // For conditional operators, the cast can be outside the conditional 6138 // operator if both expressions are DeclRefExpr's. 6139 void HandleValue(Expr *E) { 6140 E = E->IgnoreParenImpCasts(); 6141 if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) { 6142 HandleDeclRefExpr(DRE); 6143 return; 6144 } 6145 6146 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 6147 HandleValue(CO->getTrueExpr()); 6148 HandleValue(CO->getFalseExpr()); 6149 } 6150 } 6151 6152 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 6153 if ((!isRecordType && E->getCastKind() == CK_LValueToRValue) || 6154 (isRecordType && E->getCastKind() == CK_NoOp)) 6155 HandleValue(E->getSubExpr()); 6156 6157 Inherited::VisitImplicitCastExpr(E); 6158 } 6159 6160 void VisitMemberExpr(MemberExpr *E) { 6161 // Don't warn on arrays since they can be treated as pointers. 6162 if (E->getType()->canDecayToPointerType()) return; 6163 6164 ValueDecl *VD = E->getMemberDecl(); 6165 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(VD); 6166 if (isa<FieldDecl>(VD) || (MD && !MD->isStatic())) 6167 if (DeclRefExpr *DRE 6168 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 6169 HandleDeclRefExpr(DRE); 6170 return; 6171 } 6172 6173 Inherited::VisitMemberExpr(E); 6174 } 6175 6176 void VisitUnaryOperator(UnaryOperator *E) { 6177 // For POD record types, addresses of its own members are well-defined. 6178 if (E->getOpcode() == UO_AddrOf && isRecordType && isPODType && 6179 isa<MemberExpr>(E->getSubExpr())) return; 6180 Inherited::VisitUnaryOperator(E); 6181 } 6182 6183 void VisitObjCMessageExpr(ObjCMessageExpr *E) { return; } 6184 6185 void HandleDeclRefExpr(DeclRefExpr *DRE) { 6186 Decl* ReferenceDecl = DRE->getDecl(); 6187 if (OrigDecl != ReferenceDecl) return; 6188 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 6189 Sema::NotForRedeclaration); 6190 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 6191 S.PDiag(diag::warn_uninit_self_reference_in_init) 6192 << Result.getLookupName() 6193 << OrigDecl->getLocation() 6194 << DRE->getSourceRange()); 6195 } 6196 }; 6197} 6198 6199/// CheckSelfReference - Warns if OrigDecl is used in expression E. 6200void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 6201 SelfReferenceChecker(*this, OrigDecl).HandleExpr(E); 6202} 6203 6204/// AddInitializerToDecl - Adds the initializer Init to the 6205/// declaration dcl. If DirectInit is true, this is C++ direct 6206/// initialization rather than copy initialization. 6207void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 6208 bool DirectInit, bool TypeMayContainAuto) { 6209 // If there is no declaration, there was an error parsing it. Just ignore 6210 // the initializer. 6211 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 6212 return; 6213 6214 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6215 // With declarators parsed the way they are, the parser cannot 6216 // distinguish between a normal initializer and a pure-specifier. 6217 // Thus this grotesque test. 6218 IntegerLiteral *IL; 6219 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6220 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6221 CheckPureMethod(Method, Init->getSourceRange()); 6222 else { 6223 Diag(Method->getLocation(), diag::err_member_function_initialization) 6224 << Method->getDeclName() << Init->getSourceRange(); 6225 Method->setInvalidDecl(); 6226 } 6227 return; 6228 } 6229 6230 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6231 if (!VDecl) { 6232 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6233 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6234 RealDecl->setInvalidDecl(); 6235 return; 6236 } 6237 6238 // Check for self-references within variable initializers. 6239 // Variables declared within a function/method body are handled 6240 // by a dataflow analysis. 6241 if (!VDecl->hasLocalStorage() && !VDecl->isStaticLocal()) 6242 CheckSelfReference(RealDecl, Init); 6243 6244 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); 6245 6246 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6247 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6248 Expr *DeduceInit = Init; 6249 // Initializer could be a C++ direct-initializer. Deduction only works if it 6250 // contains exactly one expression. 6251 if (CXXDirectInit) { 6252 if (CXXDirectInit->getNumExprs() == 0) { 6253 // It isn't possible to write this directly, but it is possible to 6254 // end up in this situation with "auto x(some_pack...);" 6255 Diag(CXXDirectInit->getLocStart(), 6256 diag::err_auto_var_init_no_expression) 6257 << VDecl->getDeclName() << VDecl->getType() 6258 << VDecl->getSourceRange(); 6259 RealDecl->setInvalidDecl(); 6260 return; 6261 } else if (CXXDirectInit->getNumExprs() > 1) { 6262 Diag(CXXDirectInit->getExpr(1)->getLocStart(), 6263 diag::err_auto_var_init_multiple_expressions) 6264 << VDecl->getDeclName() << VDecl->getType() 6265 << VDecl->getSourceRange(); 6266 RealDecl->setInvalidDecl(); 6267 return; 6268 } else { 6269 DeduceInit = CXXDirectInit->getExpr(0); 6270 } 6271 } 6272 TypeSourceInfo *DeducedType = 0; 6273 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) == 6274 DAR_Failed) 6275 DiagnoseAutoDeductionFailure(VDecl, DeduceInit); 6276 if (!DeducedType) { 6277 RealDecl->setInvalidDecl(); 6278 return; 6279 } 6280 VDecl->setTypeSourceInfo(DeducedType); 6281 VDecl->setType(DeducedType->getType()); 6282 VDecl->ClearLinkageCache(); 6283 6284 // In ARC, infer lifetime. 6285 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6286 VDecl->setInvalidDecl(); 6287 6288 // If this is a redeclaration, check that the type we just deduced matches 6289 // the previously declared type. 6290 if (VarDecl *Old = VDecl->getPreviousDecl()) 6291 MergeVarDeclTypes(VDecl, Old); 6292 } 6293 6294 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6295 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6296 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6297 VDecl->setInvalidDecl(); 6298 return; 6299 } 6300 6301 if (!VDecl->getType()->isDependentType()) { 6302 // A definition must end up with a complete type, which means it must be 6303 // complete with the restriction that an array type might be completed by 6304 // the initializer; note that later code assumes this restriction. 6305 QualType BaseDeclType = VDecl->getType(); 6306 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6307 BaseDeclType = Array->getElementType(); 6308 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6309 diag::err_typecheck_decl_incomplete_type)) { 6310 RealDecl->setInvalidDecl(); 6311 return; 6312 } 6313 6314 // The variable can not have an abstract class type. 6315 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6316 diag::err_abstract_type_in_decl, 6317 AbstractVariableType)) 6318 VDecl->setInvalidDecl(); 6319 } 6320 6321 const VarDecl *Def; 6322 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6323 Diag(VDecl->getLocation(), diag::err_redefinition) 6324 << VDecl->getDeclName(); 6325 Diag(Def->getLocation(), diag::note_previous_definition); 6326 VDecl->setInvalidDecl(); 6327 return; 6328 } 6329 6330 const VarDecl* PrevInit = 0; 6331 if (getLangOpts().CPlusPlus) { 6332 // C++ [class.static.data]p4 6333 // If a static data member is of const integral or const 6334 // enumeration type, its declaration in the class definition can 6335 // specify a constant-initializer which shall be an integral 6336 // constant expression (5.19). In that case, the member can appear 6337 // in integral constant expressions. The member shall still be 6338 // defined in a namespace scope if it is used in the program and the 6339 // namespace scope definition shall not contain an initializer. 6340 // 6341 // We already performed a redefinition check above, but for static 6342 // data members we also need to check whether there was an in-class 6343 // declaration with an initializer. 6344 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6345 Diag(VDecl->getLocation(), diag::err_redefinition) 6346 << VDecl->getDeclName(); 6347 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6348 return; 6349 } 6350 6351 if (VDecl->hasLocalStorage()) 6352 getCurFunction()->setHasBranchProtectedScope(); 6353 6354 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6355 VDecl->setInvalidDecl(); 6356 return; 6357 } 6358 } 6359 6360 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6361 // a kernel function cannot be initialized." 6362 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6363 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6364 VDecl->setInvalidDecl(); 6365 return; 6366 } 6367 6368 // Get the decls type and save a reference for later, since 6369 // CheckInitializerTypes may change it. 6370 QualType DclT = VDecl->getType(), SavT = DclT; 6371 6372 // Top-level message sends default to 'id' when we're in a debugger 6373 // and we are assigning it to a variable of 'id' type. 6374 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCIdType()) 6375 if (Init->getType() == Context.UnknownAnyTy && isa<ObjCMessageExpr>(Init)) { 6376 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); 6377 if (Result.isInvalid()) { 6378 VDecl->setInvalidDecl(); 6379 return; 6380 } 6381 Init = Result.take(); 6382 } 6383 6384 // Perform the initialization. 6385 if (!VDecl->isInvalidDecl()) { 6386 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6387 InitializationKind Kind 6388 = DirectInit ? 6389 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6390 Init->getLocStart(), 6391 Init->getLocEnd()) 6392 : InitializationKind::CreateDirectList( 6393 VDecl->getLocation()) 6394 : InitializationKind::CreateCopy(VDecl->getLocation(), 6395 Init->getLocStart()); 6396 6397 Expr **Args = &Init; 6398 unsigned NumArgs = 1; 6399 if (CXXDirectInit) { 6400 Args = CXXDirectInit->getExprs(); 6401 NumArgs = CXXDirectInit->getNumExprs(); 6402 } 6403 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs); 6404 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6405 MultiExprArg(*this, Args,NumArgs), 6406 &DclT); 6407 if (Result.isInvalid()) { 6408 VDecl->setInvalidDecl(); 6409 return; 6410 } 6411 6412 Init = Result.takeAs<Expr>(); 6413 } 6414 6415 // If the type changed, it means we had an incomplete type that was 6416 // completed by the initializer. For example: 6417 // int ary[] = { 1, 3, 5 }; 6418 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6419 if (!VDecl->isInvalidDecl() && (DclT != SavT)) 6420 VDecl->setType(DclT); 6421 6422 // Check any implicit conversions within the expression. 6423 CheckImplicitConversions(Init, VDecl->getLocation()); 6424 6425 if (!VDecl->isInvalidDecl()) 6426 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6427 6428 Init = MaybeCreateExprWithCleanups(Init); 6429 // Attach the initializer to the decl. 6430 VDecl->setInit(Init); 6431 6432 if (VDecl->isLocalVarDecl()) { 6433 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6434 // static storage duration shall be constant expressions or string literals. 6435 // C++ does not have this restriction. 6436 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() && 6437 VDecl->getStorageClass() == SC_Static) 6438 CheckForConstantInitializer(Init, DclT); 6439 } else if (VDecl->isStaticDataMember() && 6440 VDecl->getLexicalDeclContext()->isRecord()) { 6441 // This is an in-class initialization for a static data member, e.g., 6442 // 6443 // struct S { 6444 // static const int value = 17; 6445 // }; 6446 6447 // C++ [class.mem]p4: 6448 // A member-declarator can contain a constant-initializer only 6449 // if it declares a static member (9.4) of const integral or 6450 // const enumeration type, see 9.4.2. 6451 // 6452 // C++11 [class.static.data]p3: 6453 // If a non-volatile const static data member is of integral or 6454 // enumeration type, its declaration in the class definition can 6455 // specify a brace-or-equal-initializer in which every initalizer-clause 6456 // that is an assignment-expression is a constant expression. A static 6457 // data member of literal type can be declared in the class definition 6458 // with the constexpr specifier; if so, its declaration shall specify a 6459 // brace-or-equal-initializer in which every initializer-clause that is 6460 // an assignment-expression is a constant expression. 6461 6462 // Do nothing on dependent types. 6463 if (DclT->isDependentType()) { 6464 6465 // Allow any 'static constexpr' members, whether or not they are of literal 6466 // type. We separately check that every constexpr variable is of literal 6467 // type. 6468 } else if (VDecl->isConstexpr()) { 6469 6470 // Require constness. 6471 } else if (!DclT.isConstQualified()) { 6472 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6473 << Init->getSourceRange(); 6474 VDecl->setInvalidDecl(); 6475 6476 // We allow integer constant expressions in all cases. 6477 } else if (DclT->isIntegralOrEnumerationType()) { 6478 // Check whether the expression is a constant expression. 6479 SourceLocation Loc; 6480 if (getLangOpts().CPlusPlus0x && DclT.isVolatileQualified()) 6481 // In C++11, a non-constexpr const static data member with an 6482 // in-class initializer cannot be volatile. 6483 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6484 else if (Init->isValueDependent()) 6485 ; // Nothing to check. 6486 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6487 ; // Ok, it's an ICE! 6488 else if (Init->isEvaluatable(Context)) { 6489 // If we can constant fold the initializer through heroics, accept it, 6490 // but report this as a use of an extension for -pedantic. 6491 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6492 << Init->getSourceRange(); 6493 } else { 6494 // Otherwise, this is some crazy unknown case. Report the issue at the 6495 // location provided by the isIntegerConstantExpr failed check. 6496 Diag(Loc, diag::err_in_class_initializer_non_constant) 6497 << Init->getSourceRange(); 6498 VDecl->setInvalidDecl(); 6499 } 6500 6501 // We allow foldable floating-point constants as an extension. 6502 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6503 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6504 << DclT << Init->getSourceRange(); 6505 if (getLangOpts().CPlusPlus0x) 6506 Diag(VDecl->getLocation(), 6507 diag::note_in_class_initializer_float_type_constexpr) 6508 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6509 6510 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6511 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6512 << Init->getSourceRange(); 6513 VDecl->setInvalidDecl(); 6514 } 6515 6516 // Suggest adding 'constexpr' in C++11 for literal types. 6517 } else if (getLangOpts().CPlusPlus0x && DclT->isLiteralType()) { 6518 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6519 << DclT << Init->getSourceRange() 6520 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6521 VDecl->setConstexpr(true); 6522 6523 } else { 6524 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6525 << DclT << Init->getSourceRange(); 6526 VDecl->setInvalidDecl(); 6527 } 6528 } else if (VDecl->isFileVarDecl()) { 6529 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6530 (!getLangOpts().CPlusPlus || 6531 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6532 Diag(VDecl->getLocation(), diag::warn_extern_init); 6533 6534 // C99 6.7.8p4. All file scoped initializers need to be constant. 6535 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) 6536 CheckForConstantInitializer(Init, DclT); 6537 } 6538 6539 // We will represent direct-initialization similarly to copy-initialization: 6540 // int x(1); -as-> int x = 1; 6541 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6542 // 6543 // Clients that want to distinguish between the two forms, can check for 6544 // direct initializer using VarDecl::getInitStyle(). 6545 // A major benefit is that clients that don't particularly care about which 6546 // exactly form was it (like the CodeGen) can handle both cases without 6547 // special case code. 6548 6549 // C++ 8.5p11: 6550 // The form of initialization (using parentheses or '=') is generally 6551 // insignificant, but does matter when the entity being initialized has a 6552 // class type. 6553 if (CXXDirectInit) { 6554 assert(DirectInit && "Call-style initializer must be direct init."); 6555 VDecl->setInitStyle(VarDecl::CallInit); 6556 } else if (DirectInit) { 6557 // This must be list-initialization. No other way is direct-initialization. 6558 VDecl->setInitStyle(VarDecl::ListInit); 6559 } 6560 6561 CheckCompleteVariableDeclaration(VDecl); 6562} 6563 6564/// ActOnInitializerError - Given that there was an error parsing an 6565/// initializer for the given declaration, try to return to some form 6566/// of sanity. 6567void Sema::ActOnInitializerError(Decl *D) { 6568 // Our main concern here is re-establishing invariants like "a 6569 // variable's type is either dependent or complete". 6570 if (!D || D->isInvalidDecl()) return; 6571 6572 VarDecl *VD = dyn_cast<VarDecl>(D); 6573 if (!VD) return; 6574 6575 // Auto types are meaningless if we can't make sense of the initializer. 6576 if (ParsingInitForAutoVars.count(D)) { 6577 D->setInvalidDecl(); 6578 return; 6579 } 6580 6581 QualType Ty = VD->getType(); 6582 if (Ty->isDependentType()) return; 6583 6584 // Require a complete type. 6585 if (RequireCompleteType(VD->getLocation(), 6586 Context.getBaseElementType(Ty), 6587 diag::err_typecheck_decl_incomplete_type)) { 6588 VD->setInvalidDecl(); 6589 return; 6590 } 6591 6592 // Require an abstract type. 6593 if (RequireNonAbstractType(VD->getLocation(), Ty, 6594 diag::err_abstract_type_in_decl, 6595 AbstractVariableType)) { 6596 VD->setInvalidDecl(); 6597 return; 6598 } 6599 6600 // Don't bother complaining about constructors or destructors, 6601 // though. 6602} 6603 6604void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6605 bool TypeMayContainAuto) { 6606 // If there is no declaration, there was an error parsing it. Just ignore it. 6607 if (RealDecl == 0) 6608 return; 6609 6610 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6611 QualType Type = Var->getType(); 6612 6613 // C++11 [dcl.spec.auto]p3 6614 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6615 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6616 << Var->getDeclName() << Type; 6617 Var->setInvalidDecl(); 6618 return; 6619 } 6620 6621 // C++11 [class.static.data]p3: A static data member can be declared with 6622 // the constexpr specifier; if so, its declaration shall specify 6623 // a brace-or-equal-initializer. 6624 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6625 // the definition of a variable [...] or the declaration of a static data 6626 // member. 6627 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6628 if (Var->isStaticDataMember()) 6629 Diag(Var->getLocation(), 6630 diag::err_constexpr_static_mem_var_requires_init) 6631 << Var->getDeclName(); 6632 else 6633 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6634 Var->setInvalidDecl(); 6635 return; 6636 } 6637 6638 switch (Var->isThisDeclarationADefinition()) { 6639 case VarDecl::Definition: 6640 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6641 break; 6642 6643 // We have an out-of-line definition of a static data member 6644 // that has an in-class initializer, so we type-check this like 6645 // a declaration. 6646 // 6647 // Fall through 6648 6649 case VarDecl::DeclarationOnly: 6650 // It's only a declaration. 6651 6652 // Block scope. C99 6.7p7: If an identifier for an object is 6653 // declared with no linkage (C99 6.2.2p6), the type for the 6654 // object shall be complete. 6655 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6656 !Var->getLinkage() && !Var->isInvalidDecl() && 6657 RequireCompleteType(Var->getLocation(), Type, 6658 diag::err_typecheck_decl_incomplete_type)) 6659 Var->setInvalidDecl(); 6660 6661 // Make sure that the type is not abstract. 6662 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6663 RequireNonAbstractType(Var->getLocation(), Type, 6664 diag::err_abstract_type_in_decl, 6665 AbstractVariableType)) 6666 Var->setInvalidDecl(); 6667 return; 6668 6669 case VarDecl::TentativeDefinition: 6670 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6671 // object that has file scope without an initializer, and without a 6672 // storage-class specifier or with the storage-class specifier "static", 6673 // constitutes a tentative definition. Note: A tentative definition with 6674 // external linkage is valid (C99 6.2.2p5). 6675 if (!Var->isInvalidDecl()) { 6676 if (const IncompleteArrayType *ArrayT 6677 = Context.getAsIncompleteArrayType(Type)) { 6678 if (RequireCompleteType(Var->getLocation(), 6679 ArrayT->getElementType(), 6680 diag::err_illegal_decl_array_incomplete_type)) 6681 Var->setInvalidDecl(); 6682 } else if (Var->getStorageClass() == SC_Static) { 6683 // C99 6.9.2p3: If the declaration of an identifier for an object is 6684 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6685 // declared type shall not be an incomplete type. 6686 // NOTE: code such as the following 6687 // static struct s; 6688 // struct s { int a; }; 6689 // is accepted by gcc. Hence here we issue a warning instead of 6690 // an error and we do not invalidate the static declaration. 6691 // NOTE: to avoid multiple warnings, only check the first declaration. 6692 if (Var->getPreviousDecl() == 0) 6693 RequireCompleteType(Var->getLocation(), Type, 6694 diag::ext_typecheck_decl_incomplete_type); 6695 } 6696 } 6697 6698 // Record the tentative definition; we're done. 6699 if (!Var->isInvalidDecl()) 6700 TentativeDefinitions.push_back(Var); 6701 return; 6702 } 6703 6704 // Provide a specific diagnostic for uninitialized variable 6705 // definitions with incomplete array type. 6706 if (Type->isIncompleteArrayType()) { 6707 Diag(Var->getLocation(), 6708 diag::err_typecheck_incomplete_array_needs_initializer); 6709 Var->setInvalidDecl(); 6710 return; 6711 } 6712 6713 // Provide a specific diagnostic for uninitialized variable 6714 // definitions with reference type. 6715 if (Type->isReferenceType()) { 6716 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6717 << Var->getDeclName() 6718 << SourceRange(Var->getLocation(), Var->getLocation()); 6719 Var->setInvalidDecl(); 6720 return; 6721 } 6722 6723 // Do not attempt to type-check the default initializer for a 6724 // variable with dependent type. 6725 if (Type->isDependentType()) 6726 return; 6727 6728 if (Var->isInvalidDecl()) 6729 return; 6730 6731 if (RequireCompleteType(Var->getLocation(), 6732 Context.getBaseElementType(Type), 6733 diag::err_typecheck_decl_incomplete_type)) { 6734 Var->setInvalidDecl(); 6735 return; 6736 } 6737 6738 // The variable can not have an abstract class type. 6739 if (RequireNonAbstractType(Var->getLocation(), Type, 6740 diag::err_abstract_type_in_decl, 6741 AbstractVariableType)) { 6742 Var->setInvalidDecl(); 6743 return; 6744 } 6745 6746 // Check for jumps past the implicit initializer. C++0x 6747 // clarifies that this applies to a "variable with automatic 6748 // storage duration", not a "local variable". 6749 // C++11 [stmt.dcl]p3 6750 // A program that jumps from a point where a variable with automatic 6751 // storage duration is not in scope to a point where it is in scope is 6752 // ill-formed unless the variable has scalar type, class type with a 6753 // trivial default constructor and a trivial destructor, a cv-qualified 6754 // version of one of these types, or an array of one of the preceding 6755 // types and is declared without an initializer. 6756 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) { 6757 if (const RecordType *Record 6758 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6759 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6760 // Mark the function for further checking even if the looser rules of 6761 // C++11 do not require such checks, so that we can diagnose 6762 // incompatibilities with C++98. 6763 if (!CXXRecord->isPOD()) 6764 getCurFunction()->setHasBranchProtectedScope(); 6765 } 6766 } 6767 6768 // C++03 [dcl.init]p9: 6769 // If no initializer is specified for an object, and the 6770 // object is of (possibly cv-qualified) non-POD class type (or 6771 // array thereof), the object shall be default-initialized; if 6772 // the object is of const-qualified type, the underlying class 6773 // type shall have a user-declared default 6774 // constructor. Otherwise, if no initializer is specified for 6775 // a non- static object, the object and its subobjects, if 6776 // any, have an indeterminate initial value); if the object 6777 // or any of its subobjects are of const-qualified type, the 6778 // program is ill-formed. 6779 // C++0x [dcl.init]p11: 6780 // If no initializer is specified for an object, the object is 6781 // default-initialized; [...]. 6782 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6783 InitializationKind Kind 6784 = InitializationKind::CreateDefault(Var->getLocation()); 6785 6786 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6787 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6788 MultiExprArg(*this, 0, 0)); 6789 if (Init.isInvalid()) 6790 Var->setInvalidDecl(); 6791 else if (Init.get()) { 6792 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6793 // This is important for template substitution. 6794 Var->setInitStyle(VarDecl::CallInit); 6795 } 6796 6797 CheckCompleteVariableDeclaration(Var); 6798 } 6799} 6800 6801void Sema::ActOnCXXForRangeDecl(Decl *D) { 6802 VarDecl *VD = dyn_cast<VarDecl>(D); 6803 if (!VD) { 6804 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6805 D->setInvalidDecl(); 6806 return; 6807 } 6808 6809 VD->setCXXForRangeDecl(true); 6810 6811 // for-range-declaration cannot be given a storage class specifier. 6812 int Error = -1; 6813 switch (VD->getStorageClassAsWritten()) { 6814 case SC_None: 6815 break; 6816 case SC_Extern: 6817 Error = 0; 6818 break; 6819 case SC_Static: 6820 Error = 1; 6821 break; 6822 case SC_PrivateExtern: 6823 Error = 2; 6824 break; 6825 case SC_Auto: 6826 Error = 3; 6827 break; 6828 case SC_Register: 6829 Error = 4; 6830 break; 6831 case SC_OpenCLWorkGroupLocal: 6832 llvm_unreachable("Unexpected storage class"); 6833 } 6834 if (VD->isConstexpr()) 6835 Error = 5; 6836 if (Error != -1) { 6837 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6838 << VD->getDeclName() << Error; 6839 D->setInvalidDecl(); 6840 } 6841} 6842 6843void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6844 if (var->isInvalidDecl()) return; 6845 6846 // In ARC, don't allow jumps past the implicit initialization of a 6847 // local retaining variable. 6848 if (getLangOpts().ObjCAutoRefCount && 6849 var->hasLocalStorage()) { 6850 switch (var->getType().getObjCLifetime()) { 6851 case Qualifiers::OCL_None: 6852 case Qualifiers::OCL_ExplicitNone: 6853 case Qualifiers::OCL_Autoreleasing: 6854 break; 6855 6856 case Qualifiers::OCL_Weak: 6857 case Qualifiers::OCL_Strong: 6858 getCurFunction()->setHasBranchProtectedScope(); 6859 break; 6860 } 6861 } 6862 6863 // All the following checks are C++ only. 6864 if (!getLangOpts().CPlusPlus) return; 6865 6866 QualType baseType = Context.getBaseElementType(var->getType()); 6867 if (baseType->isDependentType()) return; 6868 6869 // __block variables might require us to capture a copy-initializer. 6870 if (var->hasAttr<BlocksAttr>()) { 6871 // It's currently invalid to ever have a __block variable with an 6872 // array type; should we diagnose that here? 6873 6874 // Regardless, we don't want to ignore array nesting when 6875 // constructing this copy. 6876 QualType type = var->getType(); 6877 6878 if (type->isStructureOrClassType()) { 6879 SourceLocation poi = var->getLocation(); 6880 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi); 6881 ExprResult result = 6882 PerformCopyInitialization( 6883 InitializedEntity::InitializeBlock(poi, type, false), 6884 poi, Owned(varRef)); 6885 if (!result.isInvalid()) { 6886 result = MaybeCreateExprWithCleanups(result); 6887 Expr *init = result.takeAs<Expr>(); 6888 Context.setBlockVarCopyInits(var, init); 6889 } 6890 } 6891 } 6892 6893 Expr *Init = var->getInit(); 6894 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6895 6896 if (!var->getDeclContext()->isDependentContext() && Init) { 6897 if (IsGlobal && !var->isConstexpr() && 6898 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6899 var->getLocation()) 6900 != DiagnosticsEngine::Ignored && 6901 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6902 Diag(var->getLocation(), diag::warn_global_constructor) 6903 << Init->getSourceRange(); 6904 6905 if (var->isConstexpr()) { 6906 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6907 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6908 SourceLocation DiagLoc = var->getLocation(); 6909 // If the note doesn't add any useful information other than a source 6910 // location, fold it into the primary diagnostic. 6911 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6912 diag::note_invalid_subexpr_in_const_expr) { 6913 DiagLoc = Notes[0].first; 6914 Notes.clear(); 6915 } 6916 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6917 << var << Init->getSourceRange(); 6918 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6919 Diag(Notes[I].first, Notes[I].second); 6920 } 6921 } else if (var->isUsableInConstantExpressions(Context)) { 6922 // Check whether the initializer of a const variable of integral or 6923 // enumeration type is an ICE now, since we can't tell whether it was 6924 // initialized by a constant expression if we check later. 6925 var->checkInitIsICE(); 6926 } 6927 } 6928 6929 // Require the destructor. 6930 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6931 FinalizeVarWithDestructor(var, recordType); 6932} 6933 6934/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6935/// any semantic actions necessary after any initializer has been attached. 6936void 6937Sema::FinalizeDeclaration(Decl *ThisDecl) { 6938 // Note that we are no longer parsing the initializer for this declaration. 6939 ParsingInitForAutoVars.erase(ThisDecl); 6940} 6941 6942Sema::DeclGroupPtrTy 6943Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6944 Decl **Group, unsigned NumDecls) { 6945 SmallVector<Decl*, 8> Decls; 6946 6947 if (DS.isTypeSpecOwned()) 6948 Decls.push_back(DS.getRepAsDecl()); 6949 6950 for (unsigned i = 0; i != NumDecls; ++i) 6951 if (Decl *D = Group[i]) 6952 Decls.push_back(D); 6953 6954 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6955 DS.getTypeSpecType() == DeclSpec::TST_auto); 6956} 6957 6958/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6959/// group, performing any necessary semantic checking. 6960Sema::DeclGroupPtrTy 6961Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6962 bool TypeMayContainAuto) { 6963 // C++0x [dcl.spec.auto]p7: 6964 // If the type deduced for the template parameter U is not the same in each 6965 // deduction, the program is ill-formed. 6966 // FIXME: When initializer-list support is added, a distinction is needed 6967 // between the deduced type U and the deduced type which 'auto' stands for. 6968 // auto a = 0, b = { 1, 2, 3 }; 6969 // is legal because the deduced type U is 'int' in both cases. 6970 if (TypeMayContainAuto && NumDecls > 1) { 6971 QualType Deduced; 6972 CanQualType DeducedCanon; 6973 VarDecl *DeducedDecl = 0; 6974 for (unsigned i = 0; i != NumDecls; ++i) { 6975 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6976 AutoType *AT = D->getType()->getContainedAutoType(); 6977 // Don't reissue diagnostics when instantiating a template. 6978 if (AT && D->isInvalidDecl()) 6979 break; 6980 if (AT && AT->isDeduced()) { 6981 QualType U = AT->getDeducedType(); 6982 CanQualType UCanon = Context.getCanonicalType(U); 6983 if (Deduced.isNull()) { 6984 Deduced = U; 6985 DeducedCanon = UCanon; 6986 DeducedDecl = D; 6987 } else if (DeducedCanon != UCanon) { 6988 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6989 diag::err_auto_different_deductions) 6990 << Deduced << DeducedDecl->getDeclName() 6991 << U << D->getDeclName() 6992 << DeducedDecl->getInit()->getSourceRange() 6993 << D->getInit()->getSourceRange(); 6994 D->setInvalidDecl(); 6995 break; 6996 } 6997 } 6998 } 6999 } 7000 } 7001 7002 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 7003} 7004 7005 7006/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 7007/// to introduce parameters into function prototype scope. 7008Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 7009 const DeclSpec &DS = D.getDeclSpec(); 7010 7011 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 7012 // C++03 [dcl.stc]p2 also permits 'auto'. 7013 VarDecl::StorageClass StorageClass = SC_None; 7014 VarDecl::StorageClass StorageClassAsWritten = SC_None; 7015 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 7016 StorageClass = SC_Register; 7017 StorageClassAsWritten = SC_Register; 7018 } else if (getLangOpts().CPlusPlus && 7019 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 7020 StorageClass = SC_Auto; 7021 StorageClassAsWritten = SC_Auto; 7022 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 7023 Diag(DS.getStorageClassSpecLoc(), 7024 diag::err_invalid_storage_class_in_func_decl); 7025 D.getMutableDeclSpec().ClearStorageClassSpecs(); 7026 } 7027 7028 if (D.getDeclSpec().isThreadSpecified()) 7029 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7030 if (D.getDeclSpec().isConstexprSpecified()) 7031 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 7032 << 0; 7033 7034 DiagnoseFunctionSpecifiers(D); 7035 7036 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7037 QualType parmDeclType = TInfo->getType(); 7038 7039 if (getLangOpts().CPlusPlus) { 7040 // Check that there are no default arguments inside the type of this 7041 // parameter. 7042 CheckExtraCXXDefaultArguments(D); 7043 7044 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 7045 if (D.getCXXScopeSpec().isSet()) { 7046 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 7047 << D.getCXXScopeSpec().getRange(); 7048 D.getCXXScopeSpec().clear(); 7049 } 7050 } 7051 7052 // Ensure we have a valid name 7053 IdentifierInfo *II = 0; 7054 if (D.hasName()) { 7055 II = D.getIdentifier(); 7056 if (!II) { 7057 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 7058 << GetNameForDeclarator(D).getName().getAsString(); 7059 D.setInvalidType(true); 7060 } 7061 } 7062 7063 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 7064 if (II) { 7065 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 7066 ForRedeclaration); 7067 LookupName(R, S); 7068 if (R.isSingleResult()) { 7069 NamedDecl *PrevDecl = R.getFoundDecl(); 7070 if (PrevDecl->isTemplateParameter()) { 7071 // Maybe we will complain about the shadowed template parameter. 7072 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7073 // Just pretend that we didn't see the previous declaration. 7074 PrevDecl = 0; 7075 } else if (S->isDeclScope(PrevDecl)) { 7076 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 7077 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7078 7079 // Recover by removing the name 7080 II = 0; 7081 D.SetIdentifier(0, D.getIdentifierLoc()); 7082 D.setInvalidType(true); 7083 } 7084 } 7085 } 7086 7087 // Temporarily put parameter variables in the translation unit, not 7088 // the enclosing context. This prevents them from accidentally 7089 // looking like class members in C++. 7090 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 7091 D.getLocStart(), 7092 D.getIdentifierLoc(), II, 7093 parmDeclType, TInfo, 7094 StorageClass, StorageClassAsWritten); 7095 7096 if (D.isInvalidType()) 7097 New->setInvalidDecl(); 7098 7099 assert(S->isFunctionPrototypeScope()); 7100 assert(S->getFunctionPrototypeDepth() >= 1); 7101 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 7102 S->getNextFunctionPrototypeIndex()); 7103 7104 // Add the parameter declaration into this scope. 7105 S->AddDecl(New); 7106 if (II) 7107 IdResolver.AddDecl(New); 7108 7109 ProcessDeclAttributes(S, New, D); 7110 7111 if (D.getDeclSpec().isModulePrivateSpecified()) 7112 Diag(New->getLocation(), diag::err_module_private_local) 7113 << 1 << New->getDeclName() 7114 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7115 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7116 7117 if (New->hasAttr<BlocksAttr>()) { 7118 Diag(New->getLocation(), diag::err_block_on_nonlocal); 7119 } 7120 return New; 7121} 7122 7123/// \brief Synthesizes a variable for a parameter arising from a 7124/// typedef. 7125ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 7126 SourceLocation Loc, 7127 QualType T) { 7128 /* FIXME: setting StartLoc == Loc. 7129 Would it be worth to modify callers so as to provide proper source 7130 location for the unnamed parameters, embedding the parameter's type? */ 7131 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 7132 T, Context.getTrivialTypeSourceInfo(T, Loc), 7133 SC_None, SC_None, 0); 7134 Param->setImplicit(); 7135 return Param; 7136} 7137 7138void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 7139 ParmVarDecl * const *ParamEnd) { 7140 // Don't diagnose unused-parameter errors in template instantiations; we 7141 // will already have done so in the template itself. 7142 if (!ActiveTemplateInstantiations.empty()) 7143 return; 7144 7145 for (; Param != ParamEnd; ++Param) { 7146 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 7147 !(*Param)->hasAttr<UnusedAttr>()) { 7148 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 7149 << (*Param)->getDeclName(); 7150 } 7151 } 7152} 7153 7154void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 7155 ParmVarDecl * const *ParamEnd, 7156 QualType ReturnTy, 7157 NamedDecl *D) { 7158 if (LangOpts.NumLargeByValueCopy == 0) // No check. 7159 return; 7160 7161 // Warn if the return value is pass-by-value and larger than the specified 7162 // threshold. 7163 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 7164 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 7165 if (Size > LangOpts.NumLargeByValueCopy) 7166 Diag(D->getLocation(), diag::warn_return_value_size) 7167 << D->getDeclName() << Size; 7168 } 7169 7170 // Warn if any parameter is pass-by-value and larger than the specified 7171 // threshold. 7172 for (; Param != ParamEnd; ++Param) { 7173 QualType T = (*Param)->getType(); 7174 if (T->isDependentType() || !T.isPODType(Context)) 7175 continue; 7176 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 7177 if (Size > LangOpts.NumLargeByValueCopy) 7178 Diag((*Param)->getLocation(), diag::warn_parameter_size) 7179 << (*Param)->getDeclName() << Size; 7180 } 7181} 7182 7183ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 7184 SourceLocation NameLoc, IdentifierInfo *Name, 7185 QualType T, TypeSourceInfo *TSInfo, 7186 VarDecl::StorageClass StorageClass, 7187 VarDecl::StorageClass StorageClassAsWritten) { 7188 // In ARC, infer a lifetime qualifier for appropriate parameter types. 7189 if (getLangOpts().ObjCAutoRefCount && 7190 T.getObjCLifetime() == Qualifiers::OCL_None && 7191 T->isObjCLifetimeType()) { 7192 7193 Qualifiers::ObjCLifetime lifetime; 7194 7195 // Special cases for arrays: 7196 // - if it's const, use __unsafe_unretained 7197 // - otherwise, it's an error 7198 if (T->isArrayType()) { 7199 if (!T.isConstQualified()) { 7200 DelayedDiagnostics.add( 7201 sema::DelayedDiagnostic::makeForbiddenType( 7202 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 7203 } 7204 lifetime = Qualifiers::OCL_ExplicitNone; 7205 } else { 7206 lifetime = T->getObjCARCImplicitLifetime(); 7207 } 7208 T = Context.getLifetimeQualifiedType(T, lifetime); 7209 } 7210 7211 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 7212 Context.getAdjustedParameterType(T), 7213 TSInfo, 7214 StorageClass, StorageClassAsWritten, 7215 0); 7216 7217 // Parameters can not be abstract class types. 7218 // For record types, this is done by the AbstractClassUsageDiagnoser once 7219 // the class has been completely parsed. 7220 if (!CurContext->isRecord() && 7221 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 7222 AbstractParamType)) 7223 New->setInvalidDecl(); 7224 7225 // Parameter declarators cannot be interface types. All ObjC objects are 7226 // passed by reference. 7227 if (T->isObjCObjectType()) { 7228 SourceLocation TypeEndLoc = TSInfo->getTypeLoc().getLocEnd(); 7229 Diag(NameLoc, 7230 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 7231 << FixItHint::CreateInsertion(TypeEndLoc, "*"); 7232 T = Context.getObjCObjectPointerType(T); 7233 New->setType(T); 7234 } 7235 7236 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 7237 // duration shall not be qualified by an address-space qualifier." 7238 // Since all parameters have automatic store duration, they can not have 7239 // an address space. 7240 if (T.getAddressSpace() != 0) { 7241 Diag(NameLoc, diag::err_arg_with_address_space); 7242 New->setInvalidDecl(); 7243 } 7244 7245 return New; 7246} 7247 7248void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 7249 SourceLocation LocAfterDecls) { 7250 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 7251 7252 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 7253 // for a K&R function. 7254 if (!FTI.hasPrototype) { 7255 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 7256 --i; 7257 if (FTI.ArgInfo[i].Param == 0) { 7258 SmallString<256> Code; 7259 llvm::raw_svector_ostream(Code) << " int " 7260 << FTI.ArgInfo[i].Ident->getName() 7261 << ";\n"; 7262 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 7263 << FTI.ArgInfo[i].Ident 7264 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 7265 7266 // Implicitly declare the argument as type 'int' for lack of a better 7267 // type. 7268 AttributeFactory attrs; 7269 DeclSpec DS(attrs); 7270 const char* PrevSpec; // unused 7271 unsigned DiagID; // unused 7272 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 7273 PrevSpec, DiagID); 7274 Declarator ParamD(DS, Declarator::KNRTypeListContext); 7275 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 7276 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 7277 } 7278 } 7279 } 7280} 7281 7282Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 7283 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 7284 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 7285 Scope *ParentScope = FnBodyScope->getParent(); 7286 7287 D.setFunctionDefinitionKind(FDK_Definition); 7288 Decl *DP = HandleDeclarator(ParentScope, D, 7289 MultiTemplateParamsArg(*this)); 7290 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7291} 7292 7293static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7294 // Don't warn about invalid declarations. 7295 if (FD->isInvalidDecl()) 7296 return false; 7297 7298 // Or declarations that aren't global. 7299 if (!FD->isGlobal()) 7300 return false; 7301 7302 // Don't warn about C++ member functions. 7303 if (isa<CXXMethodDecl>(FD)) 7304 return false; 7305 7306 // Don't warn about 'main'. 7307 if (FD->isMain()) 7308 return false; 7309 7310 // Don't warn about inline functions. 7311 if (FD->isInlined()) 7312 return false; 7313 7314 // Don't warn about function templates. 7315 if (FD->getDescribedFunctionTemplate()) 7316 return false; 7317 7318 // Don't warn about function template specializations. 7319 if (FD->isFunctionTemplateSpecialization()) 7320 return false; 7321 7322 bool MissingPrototype = true; 7323 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7324 Prev; Prev = Prev->getPreviousDecl()) { 7325 // Ignore any declarations that occur in function or method 7326 // scope, because they aren't visible from the header. 7327 if (Prev->getDeclContext()->isFunctionOrMethod()) 7328 continue; 7329 7330 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7331 break; 7332 } 7333 7334 return MissingPrototype; 7335} 7336 7337void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7338 // Don't complain if we're in GNU89 mode and the previous definition 7339 // was an extern inline function. 7340 const FunctionDecl *Definition; 7341 if (FD->isDefined(Definition) && 7342 !canRedefineFunction(Definition, getLangOpts())) { 7343 if (getLangOpts().GNUMode && Definition->isInlineSpecified() && 7344 Definition->getStorageClass() == SC_Extern) 7345 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7346 << FD->getDeclName() << getLangOpts().CPlusPlus; 7347 else 7348 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7349 Diag(Definition->getLocation(), diag::note_previous_definition); 7350 } 7351} 7352 7353Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7354 // Clear the last template instantiation error context. 7355 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7356 7357 if (!D) 7358 return D; 7359 FunctionDecl *FD = 0; 7360 7361 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7362 FD = FunTmpl->getTemplatedDecl(); 7363 else 7364 FD = cast<FunctionDecl>(D); 7365 7366 // Enter a new function scope 7367 PushFunctionScope(); 7368 7369 // See if this is a redefinition. 7370 if (!FD->isLateTemplateParsed()) 7371 CheckForFunctionRedefinition(FD); 7372 7373 // Builtin functions cannot be defined. 7374 if (unsigned BuiltinID = FD->getBuiltinID()) { 7375 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7376 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7377 FD->setInvalidDecl(); 7378 } 7379 } 7380 7381 // The return type of a function definition must be complete 7382 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7383 QualType ResultType = FD->getResultType(); 7384 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7385 !FD->isInvalidDecl() && 7386 RequireCompleteType(FD->getLocation(), ResultType, 7387 diag::err_func_def_incomplete_result)) 7388 FD->setInvalidDecl(); 7389 7390 // GNU warning -Wmissing-prototypes: 7391 // Warn if a global function is defined without a previous 7392 // prototype declaration. This warning is issued even if the 7393 // definition itself provides a prototype. The aim is to detect 7394 // global functions that fail to be declared in header files. 7395 if (ShouldWarnAboutMissingPrototype(FD)) 7396 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7397 7398 if (FnBodyScope) 7399 PushDeclContext(FnBodyScope, FD); 7400 7401 // Check the validity of our function parameters 7402 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7403 /*CheckParameterNames=*/true); 7404 7405 // Introduce our parameters into the function scope 7406 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7407 ParmVarDecl *Param = FD->getParamDecl(p); 7408 Param->setOwningFunction(FD); 7409 7410 // If this has an identifier, add it to the scope stack. 7411 if (Param->getIdentifier() && FnBodyScope) { 7412 CheckShadow(FnBodyScope, Param); 7413 7414 PushOnScopeChains(Param, FnBodyScope); 7415 } 7416 } 7417 7418 // If we had any tags defined in the function prototype, 7419 // introduce them into the function scope. 7420 if (FnBodyScope) { 7421 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(), 7422 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) { 7423 NamedDecl *D = *I; 7424 7425 // Some of these decls (like enums) may have been pinned to the translation unit 7426 // for lack of a real context earlier. If so, remove from the translation unit 7427 // and reattach to the current context. 7428 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) { 7429 // Is the decl actually in the context? 7430 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(), 7431 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) { 7432 if (*DI == D) { 7433 Context.getTranslationUnitDecl()->removeDecl(D); 7434 break; 7435 } 7436 } 7437 // Either way, reassign the lexical decl context to our FunctionDecl. 7438 D->setLexicalDeclContext(CurContext); 7439 } 7440 7441 // If the decl has a non-null name, make accessible in the current scope. 7442 if (!D->getName().empty()) 7443 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false); 7444 7445 // Similarly, dive into enums and fish their constants out, making them 7446 // accessible in this scope. 7447 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) { 7448 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(), 7449 EE = ED->enumerator_end(); EI != EE; ++EI) 7450 PushOnScopeChains(&*EI, FnBodyScope, /*AddToContext=*/false); 7451 } 7452 } 7453 } 7454 7455 // Ensure that the function's exception specification is instantiated. 7456 if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>()) 7457 ResolveExceptionSpec(D->getLocation(), FPT); 7458 7459 // Checking attributes of current function definition 7460 // dllimport attribute. 7461 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7462 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7463 // dllimport attribute cannot be directly applied to definition. 7464 // Microsoft accepts dllimport for functions defined within class scope. 7465 if (!DA->isInherited() && 7466 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7467 Diag(FD->getLocation(), 7468 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7469 << "dllimport"; 7470 FD->setInvalidDecl(); 7471 return FD; 7472 } 7473 7474 // Visual C++ appears to not think this is an issue, so only issue 7475 // a warning when Microsoft extensions are disabled. 7476 if (!LangOpts.MicrosoftExt) { 7477 // If a symbol previously declared dllimport is later defined, the 7478 // attribute is ignored in subsequent references, and a warning is 7479 // emitted. 7480 Diag(FD->getLocation(), 7481 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7482 << FD->getName() << "dllimport"; 7483 } 7484 } 7485 return FD; 7486} 7487 7488/// \brief Given the set of return statements within a function body, 7489/// compute the variables that are subject to the named return value 7490/// optimization. 7491/// 7492/// Each of the variables that is subject to the named return value 7493/// optimization will be marked as NRVO variables in the AST, and any 7494/// return statement that has a marked NRVO variable as its NRVO candidate can 7495/// use the named return value optimization. 7496/// 7497/// This function applies a very simplistic algorithm for NRVO: if every return 7498/// statement in the function has the same NRVO candidate, that candidate is 7499/// the NRVO variable. 7500/// 7501/// FIXME: Employ a smarter algorithm that accounts for multiple return 7502/// statements and the lifetimes of the NRVO candidates. We should be able to 7503/// find a maximal set of NRVO variables. 7504void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7505 ReturnStmt **Returns = Scope->Returns.data(); 7506 7507 const VarDecl *NRVOCandidate = 0; 7508 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7509 if (!Returns[I]->getNRVOCandidate()) 7510 return; 7511 7512 if (!NRVOCandidate) 7513 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7514 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7515 return; 7516 } 7517 7518 if (NRVOCandidate) 7519 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7520} 7521 7522Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7523 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7524} 7525 7526Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7527 bool IsInstantiation) { 7528 FunctionDecl *FD = 0; 7529 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7530 if (FunTmpl) 7531 FD = FunTmpl->getTemplatedDecl(); 7532 else 7533 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7534 7535 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7536 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7537 7538 if (FD) { 7539 FD->setBody(Body); 7540 7541 // If the function implicitly returns zero (like 'main') or is naked, 7542 // don't complain about missing return statements. 7543 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) 7544 WP.disableCheckFallThrough(); 7545 7546 // MSVC permits the use of pure specifier (=0) on function definition, 7547 // defined at class scope, warn about this non standard construct. 7548 if (getLangOpts().MicrosoftExt && FD->isPure()) 7549 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7550 7551 if (!FD->isInvalidDecl()) { 7552 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7553 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7554 FD->getResultType(), FD); 7555 7556 // If this is a constructor, we need a vtable. 7557 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7558 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7559 7560 computeNRVO(Body, getCurFunction()); 7561 } 7562 7563 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 7564 "Function parsing confused"); 7565 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7566 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7567 MD->setBody(Body); 7568 if (Body) 7569 MD->setEndLoc(Body->getLocEnd()); 7570 if (!MD->isInvalidDecl()) { 7571 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7572 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7573 MD->getResultType(), MD); 7574 7575 if (Body) 7576 computeNRVO(Body, getCurFunction()); 7577 } 7578 if (ObjCShouldCallSuperDealloc) { 7579 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7580 ObjCShouldCallSuperDealloc = false; 7581 } 7582 if (ObjCShouldCallSuperFinalize) { 7583 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7584 ObjCShouldCallSuperFinalize = false; 7585 } 7586 } else { 7587 return 0; 7588 } 7589 7590 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7591 "ObjC methods, which should have been handled in the block above."); 7592 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7593 "ObjC methods, which should have been handled in the block above."); 7594 7595 // Verify and clean out per-function state. 7596 if (Body) { 7597 // C++ constructors that have function-try-blocks can't have return 7598 // statements in the handlers of that block. (C++ [except.handle]p14) 7599 // Verify this. 7600 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7601 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7602 7603 // Verify that gotos and switch cases don't jump into scopes illegally. 7604 if (getCurFunction()->NeedsScopeChecking() && 7605 !dcl->isInvalidDecl() && 7606 !hasAnyUnrecoverableErrorsInThisFunction()) 7607 DiagnoseInvalidJumps(Body); 7608 7609 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7610 if (!Destructor->getParent()->isDependentType()) 7611 CheckDestructor(Destructor); 7612 7613 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7614 Destructor->getParent()); 7615 } 7616 7617 // If any errors have occurred, clear out any temporaries that may have 7618 // been leftover. This ensures that these temporaries won't be picked up for 7619 // deletion in some later function. 7620 if (PP.getDiagnostics().hasErrorOccurred() || 7621 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7622 DiscardCleanupsInEvaluationContext(); 7623 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7624 // Since the body is valid, issue any analysis-based warnings that are 7625 // enabled. 7626 ActivePolicy = &WP; 7627 } 7628 7629 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7630 (!CheckConstexprFunctionDecl(FD) || 7631 !CheckConstexprFunctionBody(FD, Body))) 7632 FD->setInvalidDecl(); 7633 7634 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7635 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7636 assert(MaybeODRUseExprs.empty() && 7637 "Leftover expressions for odr-use checking"); 7638 } 7639 7640 if (!IsInstantiation) 7641 PopDeclContext(); 7642 7643 PopFunctionScopeInfo(ActivePolicy, dcl); 7644 7645 // If any errors have occurred, clear out any temporaries that may have 7646 // been leftover. This ensures that these temporaries won't be picked up for 7647 // deletion in some later function. 7648 if (getDiagnostics().hasErrorOccurred()) { 7649 DiscardCleanupsInEvaluationContext(); 7650 } 7651 7652 return dcl; 7653} 7654 7655 7656/// When we finish delayed parsing of an attribute, we must attach it to the 7657/// relevant Decl. 7658void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7659 ParsedAttributes &Attrs) { 7660 // Always attach attributes to the underlying decl. 7661 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7662 D = TD->getTemplatedDecl(); 7663 ProcessDeclAttributeList(S, D, Attrs.getList()); 7664 7665 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D)) 7666 if (Method->isStatic()) 7667 checkThisInStaticMemberFunctionAttributes(Method); 7668} 7669 7670 7671/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7672/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7673NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7674 IdentifierInfo &II, Scope *S) { 7675 // Before we produce a declaration for an implicitly defined 7676 // function, see whether there was a locally-scoped declaration of 7677 // this name as a function or variable. If so, use that 7678 // (non-visible) declaration, and complain about it. 7679 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7680 = findLocallyScopedExternalDecl(&II); 7681 if (Pos != LocallyScopedExternalDecls.end()) { 7682 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7683 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7684 return Pos->second; 7685 } 7686 7687 // Extension in C99. Legal in C90, but warn about it. 7688 unsigned diag_id; 7689 if (II.getName().startswith("__builtin_")) 7690 diag_id = diag::warn_builtin_unknown; 7691 else if (getLangOpts().C99) 7692 diag_id = diag::ext_implicit_function_decl; 7693 else 7694 diag_id = diag::warn_implicit_function_decl; 7695 Diag(Loc, diag_id) << &II; 7696 7697 // Because typo correction is expensive, only do it if the implicit 7698 // function declaration is going to be treated as an error. 7699 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7700 TypoCorrection Corrected; 7701 DeclFilterCCC<FunctionDecl> Validator; 7702 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7703 LookupOrdinaryName, S, 0, Validator))) { 7704 std::string CorrectedStr = Corrected.getAsString(getLangOpts()); 7705 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts()); 7706 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7707 7708 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7709 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7710 7711 if (Func->getLocation().isValid() 7712 && !II.getName().startswith("__builtin_")) 7713 Diag(Func->getLocation(), diag::note_previous_decl) 7714 << CorrectedQuotedStr; 7715 } 7716 } 7717 7718 // Set a Declarator for the implicit definition: int foo(); 7719 const char *Dummy; 7720 AttributeFactory attrFactory; 7721 DeclSpec DS(attrFactory); 7722 unsigned DiagID; 7723 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7724 (void)Error; // Silence warning. 7725 assert(!Error && "Error setting up implicit decl!"); 7726 Declarator D(DS, Declarator::BlockContext); 7727 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7728 0, 0, true, SourceLocation(), 7729 SourceLocation(), SourceLocation(), 7730 SourceLocation(), 7731 EST_None, SourceLocation(), 7732 0, 0, 0, 0, Loc, Loc, D), 7733 DS.getAttributes(), 7734 SourceLocation()); 7735 D.SetIdentifier(&II, Loc); 7736 7737 // Insert this function into translation-unit scope. 7738 7739 DeclContext *PrevDC = CurContext; 7740 CurContext = Context.getTranslationUnitDecl(); 7741 7742 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7743 FD->setImplicit(); 7744 7745 CurContext = PrevDC; 7746 7747 AddKnownFunctionAttributes(FD); 7748 7749 return FD; 7750} 7751 7752/// \brief Adds any function attributes that we know a priori based on 7753/// the declaration of this function. 7754/// 7755/// These attributes can apply both to implicitly-declared builtins 7756/// (like __builtin___printf_chk) or to library-declared functions 7757/// like NSLog or printf. 7758/// 7759/// We need to check for duplicate attributes both here and where user-written 7760/// attributes are applied to declarations. 7761void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7762 if (FD->isInvalidDecl()) 7763 return; 7764 7765 // If this is a built-in function, map its builtin attributes to 7766 // actual attributes. 7767 if (unsigned BuiltinID = FD->getBuiltinID()) { 7768 // Handle printf-formatting attributes. 7769 unsigned FormatIdx; 7770 bool HasVAListArg; 7771 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7772 if (!FD->getAttr<FormatAttr>()) { 7773 const char *fmt = "printf"; 7774 unsigned int NumParams = FD->getNumParams(); 7775 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7776 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7777 fmt = "NSString"; 7778 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7779 fmt, FormatIdx+1, 7780 HasVAListArg ? 0 : FormatIdx+2)); 7781 } 7782 } 7783 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7784 HasVAListArg)) { 7785 if (!FD->getAttr<FormatAttr>()) 7786 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7787 "scanf", FormatIdx+1, 7788 HasVAListArg ? 0 : FormatIdx+2)); 7789 } 7790 7791 // Mark const if we don't care about errno and that is the only 7792 // thing preventing the function from being const. This allows 7793 // IRgen to use LLVM intrinsics for such functions. 7794 if (!getLangOpts().MathErrno && 7795 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7796 if (!FD->getAttr<ConstAttr>()) 7797 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7798 } 7799 7800 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7801 !FD->getAttr<ReturnsTwiceAttr>()) 7802 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7803 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7804 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7805 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7806 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7807 } 7808 7809 IdentifierInfo *Name = FD->getIdentifier(); 7810 if (!Name) 7811 return; 7812 if ((!getLangOpts().CPlusPlus && 7813 FD->getDeclContext()->isTranslationUnit()) || 7814 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7815 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7816 LinkageSpecDecl::lang_c)) { 7817 // Okay: this could be a libc/libm/Objective-C function we know 7818 // about. 7819 } else 7820 return; 7821 7822 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7823 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7824 // target-specific builtins, perhaps? 7825 if (!FD->getAttr<FormatAttr>()) 7826 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7827 "printf", 2, 7828 Name->isStr("vasprintf") ? 0 : 3)); 7829 } 7830} 7831 7832TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7833 TypeSourceInfo *TInfo) { 7834 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7835 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7836 7837 if (!TInfo) { 7838 assert(D.isInvalidType() && "no declarator info for valid type"); 7839 TInfo = Context.getTrivialTypeSourceInfo(T); 7840 } 7841 7842 // Scope manipulation handled by caller. 7843 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7844 D.getLocStart(), 7845 D.getIdentifierLoc(), 7846 D.getIdentifier(), 7847 TInfo); 7848 7849 // Bail out immediately if we have an invalid declaration. 7850 if (D.isInvalidType()) { 7851 NewTD->setInvalidDecl(); 7852 return NewTD; 7853 } 7854 7855 if (D.getDeclSpec().isModulePrivateSpecified()) { 7856 if (CurContext->isFunctionOrMethod()) 7857 Diag(NewTD->getLocation(), diag::err_module_private_local) 7858 << 2 << NewTD->getDeclName() 7859 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7860 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7861 else 7862 NewTD->setModulePrivate(); 7863 } 7864 7865 // C++ [dcl.typedef]p8: 7866 // If the typedef declaration defines an unnamed class (or 7867 // enum), the first typedef-name declared by the declaration 7868 // to be that class type (or enum type) is used to denote the 7869 // class type (or enum type) for linkage purposes only. 7870 // We need to check whether the type was declared in the declaration. 7871 switch (D.getDeclSpec().getTypeSpecType()) { 7872 case TST_enum: 7873 case TST_struct: 7874 case TST_union: 7875 case TST_class: { 7876 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7877 7878 // Do nothing if the tag is not anonymous or already has an 7879 // associated typedef (from an earlier typedef in this decl group). 7880 if (tagFromDeclSpec->getIdentifier()) break; 7881 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7882 7883 // A well-formed anonymous tag must always be a TUK_Definition. 7884 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7885 7886 // The type must match the tag exactly; no qualifiers allowed. 7887 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7888 break; 7889 7890 // Otherwise, set this is the anon-decl typedef for the tag. 7891 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7892 break; 7893 } 7894 7895 default: 7896 break; 7897 } 7898 7899 return NewTD; 7900} 7901 7902 7903/// \brief Check that this is a valid underlying type for an enum declaration. 7904bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) { 7905 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7906 QualType T = TI->getType(); 7907 7908 if (T->isDependentType() || T->isIntegralType(Context)) 7909 return false; 7910 7911 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T; 7912 return true; 7913} 7914 7915/// Check whether this is a valid redeclaration of a previous enumeration. 7916/// \return true if the redeclaration was invalid. 7917bool Sema::CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped, 7918 QualType EnumUnderlyingTy, 7919 const EnumDecl *Prev) { 7920 bool IsFixed = !EnumUnderlyingTy.isNull(); 7921 7922 if (IsScoped != Prev->isScoped()) { 7923 Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch) 7924 << Prev->isScoped(); 7925 Diag(Prev->getLocation(), diag::note_previous_use); 7926 return true; 7927 } 7928 7929 if (IsFixed && Prev->isFixed()) { 7930 if (!EnumUnderlyingTy->isDependentType() && 7931 !Prev->getIntegerType()->isDependentType() && 7932 !Context.hasSameUnqualifiedType(EnumUnderlyingTy, 7933 Prev->getIntegerType())) { 7934 Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch) 7935 << EnumUnderlyingTy << Prev->getIntegerType(); 7936 Diag(Prev->getLocation(), diag::note_previous_use); 7937 return true; 7938 } 7939 } else if (IsFixed != Prev->isFixed()) { 7940 Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch) 7941 << Prev->isFixed(); 7942 Diag(Prev->getLocation(), diag::note_previous_use); 7943 return true; 7944 } 7945 7946 return false; 7947} 7948 7949/// \brief Determine whether a tag with a given kind is acceptable 7950/// as a redeclaration of the given tag declaration. 7951/// 7952/// \returns true if the new tag kind is acceptable, false otherwise. 7953bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7954 TagTypeKind NewTag, bool isDefinition, 7955 SourceLocation NewTagLoc, 7956 const IdentifierInfo &Name) { 7957 // C++ [dcl.type.elab]p3: 7958 // The class-key or enum keyword present in the 7959 // elaborated-type-specifier shall agree in kind with the 7960 // declaration to which the name in the elaborated-type-specifier 7961 // refers. This rule also applies to the form of 7962 // elaborated-type-specifier that declares a class-name or 7963 // friend class since it can be construed as referring to the 7964 // definition of the class. Thus, in any 7965 // elaborated-type-specifier, the enum keyword shall be used to 7966 // refer to an enumeration (7.2), the union class-key shall be 7967 // used to refer to a union (clause 9), and either the class or 7968 // struct class-key shall be used to refer to a class (clause 9) 7969 // declared using the class or struct class-key. 7970 TagTypeKind OldTag = Previous->getTagKind(); 7971 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7972 if (OldTag == NewTag) 7973 return true; 7974 7975 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7976 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7977 // Warn about the struct/class tag mismatch. 7978 bool isTemplate = false; 7979 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7980 isTemplate = Record->getDescribedClassTemplate(); 7981 7982 if (!ActiveTemplateInstantiations.empty()) { 7983 // In a template instantiation, do not offer fix-its for tag mismatches 7984 // since they usually mess up the template instead of fixing the problem. 7985 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7986 << (NewTag == TTK_Class) << isTemplate << &Name; 7987 return true; 7988 } 7989 7990 if (isDefinition) { 7991 // On definitions, check previous tags and issue a fix-it for each 7992 // one that doesn't match the current tag. 7993 if (Previous->getDefinition()) { 7994 // Don't suggest fix-its for redefinitions. 7995 return true; 7996 } 7997 7998 bool previousMismatch = false; 7999 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 8000 E(Previous->redecls_end()); I != E; ++I) { 8001 if (I->getTagKind() != NewTag) { 8002 if (!previousMismatch) { 8003 previousMismatch = true; 8004 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 8005 << (NewTag == TTK_Class) << isTemplate << &Name; 8006 } 8007 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 8008 << (NewTag == TTK_Class) 8009 << FixItHint::CreateReplacement(I->getInnerLocStart(), 8010 NewTag == TTK_Class? 8011 "class" : "struct"); 8012 } 8013 } 8014 return true; 8015 } 8016 8017 // Check for a previous definition. If current tag and definition 8018 // are same type, do nothing. If no definition, but disagree with 8019 // with previous tag type, give a warning, but no fix-it. 8020 const TagDecl *Redecl = Previous->getDefinition() ? 8021 Previous->getDefinition() : Previous; 8022 if (Redecl->getTagKind() == NewTag) { 8023 return true; 8024 } 8025 8026 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 8027 << (NewTag == TTK_Class) 8028 << isTemplate << &Name; 8029 Diag(Redecl->getLocation(), diag::note_previous_use); 8030 8031 // If there is a previous defintion, suggest a fix-it. 8032 if (Previous->getDefinition()) { 8033 Diag(NewTagLoc, diag::note_struct_class_suggestion) 8034 << (Redecl->getTagKind() == TTK_Class) 8035 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 8036 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 8037 } 8038 8039 return true; 8040 } 8041 return false; 8042} 8043 8044/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 8045/// former case, Name will be non-null. In the later case, Name will be null. 8046/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 8047/// reference/declaration/definition of a tag. 8048Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 8049 SourceLocation KWLoc, CXXScopeSpec &SS, 8050 IdentifierInfo *Name, SourceLocation NameLoc, 8051 AttributeList *Attr, AccessSpecifier AS, 8052 SourceLocation ModulePrivateLoc, 8053 MultiTemplateParamsArg TemplateParameterLists, 8054 bool &OwnedDecl, bool &IsDependent, 8055 SourceLocation ScopedEnumKWLoc, 8056 bool ScopedEnumUsesClassTag, 8057 TypeResult UnderlyingType) { 8058 // If this is not a definition, it must have a name. 8059 IdentifierInfo *OrigName = Name; 8060 assert((Name != 0 || TUK == TUK_Definition) && 8061 "Nameless record must be a definition!"); 8062 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 8063 8064 OwnedDecl = false; 8065 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8066 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 8067 8068 // FIXME: Check explicit specializations more carefully. 8069 bool isExplicitSpecialization = false; 8070 bool Invalid = false; 8071 8072 // We only need to do this matching if we have template parameters 8073 // or a scope specifier, which also conveniently avoids this work 8074 // for non-C++ cases. 8075 if (TemplateParameterLists.size() > 0 || 8076 (SS.isNotEmpty() && TUK != TUK_Reference)) { 8077 if (TemplateParameterList *TemplateParams 8078 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 8079 TemplateParameterLists.get(), 8080 TemplateParameterLists.size(), 8081 TUK == TUK_Friend, 8082 isExplicitSpecialization, 8083 Invalid)) { 8084 if (TemplateParams->size() > 0) { 8085 // This is a declaration or definition of a class template (which may 8086 // be a member of another template). 8087 8088 if (Invalid) 8089 return 0; 8090 8091 OwnedDecl = false; 8092 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 8093 SS, Name, NameLoc, Attr, 8094 TemplateParams, AS, 8095 ModulePrivateLoc, 8096 TemplateParameterLists.size() - 1, 8097 (TemplateParameterList**) TemplateParameterLists.release()); 8098 return Result.get(); 8099 } else { 8100 // The "template<>" header is extraneous. 8101 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8102 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8103 isExplicitSpecialization = true; 8104 } 8105 } 8106 } 8107 8108 // Figure out the underlying type if this a enum declaration. We need to do 8109 // this early, because it's needed to detect if this is an incompatible 8110 // redeclaration. 8111 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 8112 8113 if (Kind == TTK_Enum) { 8114 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 8115 // No underlying type explicitly specified, or we failed to parse the 8116 // type, default to int. 8117 EnumUnderlying = Context.IntTy.getTypePtr(); 8118 else if (UnderlyingType.get()) { 8119 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 8120 // integral type; any cv-qualification is ignored. 8121 TypeSourceInfo *TI = 0; 8122 GetTypeFromParser(UnderlyingType.get(), &TI); 8123 EnumUnderlying = TI; 8124 8125 if (CheckEnumUnderlyingType(TI)) 8126 // Recover by falling back to int. 8127 EnumUnderlying = Context.IntTy.getTypePtr(); 8128 8129 if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI, 8130 UPPC_FixedUnderlyingType)) 8131 EnumUnderlying = Context.IntTy.getTypePtr(); 8132 8133 } else if (getLangOpts().MicrosoftMode) 8134 // Microsoft enums are always of int type. 8135 EnumUnderlying = Context.IntTy.getTypePtr(); 8136 } 8137 8138 DeclContext *SearchDC = CurContext; 8139 DeclContext *DC = CurContext; 8140 bool isStdBadAlloc = false; 8141 8142 RedeclarationKind Redecl = ForRedeclaration; 8143 if (TUK == TUK_Friend || TUK == TUK_Reference) 8144 Redecl = NotForRedeclaration; 8145 8146 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 8147 8148 if (Name && SS.isNotEmpty()) { 8149 // We have a nested-name tag ('struct foo::bar'). 8150 8151 // Check for invalid 'foo::'. 8152 if (SS.isInvalid()) { 8153 Name = 0; 8154 goto CreateNewDecl; 8155 } 8156 8157 // If this is a friend or a reference to a class in a dependent 8158 // context, don't try to make a decl for it. 8159 if (TUK == TUK_Friend || TUK == TUK_Reference) { 8160 DC = computeDeclContext(SS, false); 8161 if (!DC) { 8162 IsDependent = true; 8163 return 0; 8164 } 8165 } else { 8166 DC = computeDeclContext(SS, true); 8167 if (!DC) { 8168 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 8169 << SS.getRange(); 8170 return 0; 8171 } 8172 } 8173 8174 if (RequireCompleteDeclContext(SS, DC)) 8175 return 0; 8176 8177 SearchDC = DC; 8178 // Look-up name inside 'foo::'. 8179 LookupQualifiedName(Previous, DC); 8180 8181 if (Previous.isAmbiguous()) 8182 return 0; 8183 8184 if (Previous.empty()) { 8185 // Name lookup did not find anything. However, if the 8186 // nested-name-specifier refers to the current instantiation, 8187 // and that current instantiation has any dependent base 8188 // classes, we might find something at instantiation time: treat 8189 // this as a dependent elaborated-type-specifier. 8190 // But this only makes any sense for reference-like lookups. 8191 if (Previous.wasNotFoundInCurrentInstantiation() && 8192 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8193 IsDependent = true; 8194 return 0; 8195 } 8196 8197 // A tag 'foo::bar' must already exist. 8198 Diag(NameLoc, diag::err_not_tag_in_scope) 8199 << Kind << Name << DC << SS.getRange(); 8200 Name = 0; 8201 Invalid = true; 8202 goto CreateNewDecl; 8203 } 8204 } else if (Name) { 8205 // If this is a named struct, check to see if there was a previous forward 8206 // declaration or definition. 8207 // FIXME: We're looking into outer scopes here, even when we 8208 // shouldn't be. Doing so can result in ambiguities that we 8209 // shouldn't be diagnosing. 8210 LookupName(Previous, S); 8211 8212 if (Previous.isAmbiguous() && 8213 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 8214 LookupResult::Filter F = Previous.makeFilter(); 8215 while (F.hasNext()) { 8216 NamedDecl *ND = F.next(); 8217 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 8218 F.erase(); 8219 } 8220 F.done(); 8221 } 8222 8223 // Note: there used to be some attempt at recovery here. 8224 if (Previous.isAmbiguous()) 8225 return 0; 8226 8227 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) { 8228 // FIXME: This makes sure that we ignore the contexts associated 8229 // with C structs, unions, and enums when looking for a matching 8230 // tag declaration or definition. See the similar lookup tweak 8231 // in Sema::LookupName; is there a better way to deal with this? 8232 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 8233 SearchDC = SearchDC->getParent(); 8234 } 8235 } else if (S->isFunctionPrototypeScope()) { 8236 // If this is an enum declaration in function prototype scope, set its 8237 // initial context to the translation unit. 8238 // FIXME: [citation needed] 8239 SearchDC = Context.getTranslationUnitDecl(); 8240 } 8241 8242 if (Previous.isSingleResult() && 8243 Previous.getFoundDecl()->isTemplateParameter()) { 8244 // Maybe we will complain about the shadowed template parameter. 8245 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 8246 // Just pretend that we didn't see the previous declaration. 8247 Previous.clear(); 8248 } 8249 8250 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace && 8251 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 8252 // This is a declaration of or a reference to "std::bad_alloc". 8253 isStdBadAlloc = true; 8254 8255 if (Previous.empty() && StdBadAlloc) { 8256 // std::bad_alloc has been implicitly declared (but made invisible to 8257 // name lookup). Fill in this implicit declaration as the previous 8258 // declaration, so that the declarations get chained appropriately. 8259 Previous.addDecl(getStdBadAlloc()); 8260 } 8261 } 8262 8263 // If we didn't find a previous declaration, and this is a reference 8264 // (or friend reference), move to the correct scope. In C++, we 8265 // also need to do a redeclaration lookup there, just in case 8266 // there's a shadow friend decl. 8267 if (Name && Previous.empty() && 8268 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8269 if (Invalid) goto CreateNewDecl; 8270 assert(SS.isEmpty()); 8271 8272 if (TUK == TUK_Reference) { 8273 // C++ [basic.scope.pdecl]p5: 8274 // -- for an elaborated-type-specifier of the form 8275 // 8276 // class-key identifier 8277 // 8278 // if the elaborated-type-specifier is used in the 8279 // decl-specifier-seq or parameter-declaration-clause of a 8280 // function defined in namespace scope, the identifier is 8281 // declared as a class-name in the namespace that contains 8282 // the declaration; otherwise, except as a friend 8283 // declaration, the identifier is declared in the smallest 8284 // non-class, non-function-prototype scope that contains the 8285 // declaration. 8286 // 8287 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 8288 // C structs and unions. 8289 // 8290 // It is an error in C++ to declare (rather than define) an enum 8291 // type, including via an elaborated type specifier. We'll 8292 // diagnose that later; for now, declare the enum in the same 8293 // scope as we would have picked for any other tag type. 8294 // 8295 // GNU C also supports this behavior as part of its incomplete 8296 // enum types extension, while GNU C++ does not. 8297 // 8298 // Find the context where we'll be declaring the tag. 8299 // FIXME: We would like to maintain the current DeclContext as the 8300 // lexical context, 8301 while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod()) 8302 SearchDC = SearchDC->getParent(); 8303 8304 // Find the scope where we'll be declaring the tag. 8305 while (S->isClassScope() || 8306 (getLangOpts().CPlusPlus && 8307 S->isFunctionPrototypeScope()) || 8308 ((S->getFlags() & Scope::DeclScope) == 0) || 8309 (S->getEntity() && 8310 ((DeclContext *)S->getEntity())->isTransparentContext())) 8311 S = S->getParent(); 8312 } else { 8313 assert(TUK == TUK_Friend); 8314 // C++ [namespace.memdef]p3: 8315 // If a friend declaration in a non-local class first declares a 8316 // class or function, the friend class or function is a member of 8317 // the innermost enclosing namespace. 8318 SearchDC = SearchDC->getEnclosingNamespaceContext(); 8319 } 8320 8321 // In C++, we need to do a redeclaration lookup to properly 8322 // diagnose some problems. 8323 if (getLangOpts().CPlusPlus) { 8324 Previous.setRedeclarationKind(ForRedeclaration); 8325 LookupQualifiedName(Previous, SearchDC); 8326 } 8327 } 8328 8329 if (!Previous.empty()) { 8330 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 8331 8332 // It's okay to have a tag decl in the same scope as a typedef 8333 // which hides a tag decl in the same scope. Finding this 8334 // insanity with a redeclaration lookup can only actually happen 8335 // in C++. 8336 // 8337 // This is also okay for elaborated-type-specifiers, which is 8338 // technically forbidden by the current standard but which is 8339 // okay according to the likely resolution of an open issue; 8340 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 8341 if (getLangOpts().CPlusPlus) { 8342 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8343 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 8344 TagDecl *Tag = TT->getDecl(); 8345 if (Tag->getDeclName() == Name && 8346 Tag->getDeclContext()->getRedeclContext() 8347 ->Equals(TD->getDeclContext()->getRedeclContext())) { 8348 PrevDecl = Tag; 8349 Previous.clear(); 8350 Previous.addDecl(Tag); 8351 Previous.resolveKind(); 8352 } 8353 } 8354 } 8355 } 8356 8357 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 8358 // If this is a use of a previous tag, or if the tag is already declared 8359 // in the same scope (so that the definition/declaration completes or 8360 // rementions the tag), reuse the decl. 8361 if (TUK == TUK_Reference || TUK == TUK_Friend || 8362 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 8363 // Make sure that this wasn't declared as an enum and now used as a 8364 // struct or something similar. 8365 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 8366 TUK == TUK_Definition, KWLoc, 8367 *Name)) { 8368 bool SafeToContinue 8369 = (PrevTagDecl->getTagKind() != TTK_Enum && 8370 Kind != TTK_Enum); 8371 if (SafeToContinue) 8372 Diag(KWLoc, diag::err_use_with_wrong_tag) 8373 << Name 8374 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8375 PrevTagDecl->getKindName()); 8376 else 8377 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8378 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8379 8380 if (SafeToContinue) 8381 Kind = PrevTagDecl->getTagKind(); 8382 else { 8383 // Recover by making this an anonymous redefinition. 8384 Name = 0; 8385 Previous.clear(); 8386 Invalid = true; 8387 } 8388 } 8389 8390 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8391 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8392 8393 // If this is an elaborated-type-specifier for a scoped enumeration, 8394 // the 'class' keyword is not necessary and not permitted. 8395 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8396 if (ScopedEnum) 8397 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8398 << PrevEnum->isScoped() 8399 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8400 return PrevTagDecl; 8401 } 8402 8403 QualType EnumUnderlyingTy; 8404 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8405 EnumUnderlyingTy = TI->getType(); 8406 else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>()) 8407 EnumUnderlyingTy = QualType(T, 0); 8408 8409 // All conflicts with previous declarations are recovered by 8410 // returning the previous declaration, unless this is a definition, 8411 // in which case we want the caller to bail out. 8412 if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc, 8413 ScopedEnum, EnumUnderlyingTy, PrevEnum)) 8414 return TUK == TUK_Declaration ? PrevTagDecl : 0; 8415 } 8416 8417 if (!Invalid) { 8418 // If this is a use, just return the declaration we found. 8419 8420 // FIXME: In the future, return a variant or some other clue 8421 // for the consumer of this Decl to know it doesn't own it. 8422 // For our current ASTs this shouldn't be a problem, but will 8423 // need to be changed with DeclGroups. 8424 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8425 getLangOpts().MicrosoftExt)) || TUK == TUK_Friend) 8426 return PrevTagDecl; 8427 8428 // Diagnose attempts to redefine a tag. 8429 if (TUK == TUK_Definition) { 8430 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8431 // If we're defining a specialization and the previous definition 8432 // is from an implicit instantiation, don't emit an error 8433 // here; we'll catch this in the general case below. 8434 bool IsExplicitSpecializationAfterInstantiation = false; 8435 if (isExplicitSpecialization) { 8436 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def)) 8437 IsExplicitSpecializationAfterInstantiation = 8438 RD->getTemplateSpecializationKind() != 8439 TSK_ExplicitSpecialization; 8440 else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def)) 8441 IsExplicitSpecializationAfterInstantiation = 8442 ED->getTemplateSpecializationKind() != 8443 TSK_ExplicitSpecialization; 8444 } 8445 8446 if (!IsExplicitSpecializationAfterInstantiation) { 8447 // A redeclaration in function prototype scope in C isn't 8448 // visible elsewhere, so merely issue a warning. 8449 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope()) 8450 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name; 8451 else 8452 Diag(NameLoc, diag::err_redefinition) << Name; 8453 Diag(Def->getLocation(), diag::note_previous_definition); 8454 // If this is a redefinition, recover by making this 8455 // struct be anonymous, which will make any later 8456 // references get the previous definition. 8457 Name = 0; 8458 Previous.clear(); 8459 Invalid = true; 8460 } 8461 } else { 8462 // If the type is currently being defined, complain 8463 // about a nested redefinition. 8464 const TagType *Tag 8465 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8466 if (Tag->isBeingDefined()) { 8467 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8468 Diag(PrevTagDecl->getLocation(), 8469 diag::note_previous_definition); 8470 Name = 0; 8471 Previous.clear(); 8472 Invalid = true; 8473 } 8474 } 8475 8476 // Okay, this is definition of a previously declared or referenced 8477 // tag PrevDecl. We're going to create a new Decl for it. 8478 } 8479 } 8480 // If we get here we have (another) forward declaration or we 8481 // have a definition. Just create a new decl. 8482 8483 } else { 8484 // If we get here, this is a definition of a new tag type in a nested 8485 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8486 // new decl/type. We set PrevDecl to NULL so that the entities 8487 // have distinct types. 8488 Previous.clear(); 8489 } 8490 // If we get here, we're going to create a new Decl. If PrevDecl 8491 // is non-NULL, it's a definition of the tag declared by 8492 // PrevDecl. If it's NULL, we have a new definition. 8493 8494 8495 // Otherwise, PrevDecl is not a tag, but was found with tag 8496 // lookup. This is only actually possible in C++, where a few 8497 // things like templates still live in the tag namespace. 8498 } else { 8499 // Use a better diagnostic if an elaborated-type-specifier 8500 // found the wrong kind of type on the first 8501 // (non-redeclaration) lookup. 8502 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8503 !Previous.isForRedeclaration()) { 8504 unsigned Kind = 0; 8505 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8506 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8507 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8508 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8509 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8510 Invalid = true; 8511 8512 // Otherwise, only diagnose if the declaration is in scope. 8513 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8514 isExplicitSpecialization)) { 8515 // do nothing 8516 8517 // Diagnose implicit declarations introduced by elaborated types. 8518 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8519 unsigned Kind = 0; 8520 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8521 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8522 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8523 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8524 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8525 Invalid = true; 8526 8527 // Otherwise it's a declaration. Call out a particularly common 8528 // case here. 8529 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8530 unsigned Kind = 0; 8531 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8532 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8533 << Name << Kind << TND->getUnderlyingType(); 8534 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8535 Invalid = true; 8536 8537 // Otherwise, diagnose. 8538 } else { 8539 // The tag name clashes with something else in the target scope, 8540 // issue an error and recover by making this tag be anonymous. 8541 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8542 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8543 Name = 0; 8544 Invalid = true; 8545 } 8546 8547 // The existing declaration isn't relevant to us; we're in a 8548 // new scope, so clear out the previous declaration. 8549 Previous.clear(); 8550 } 8551 } 8552 8553CreateNewDecl: 8554 8555 TagDecl *PrevDecl = 0; 8556 if (Previous.isSingleResult()) 8557 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8558 8559 // If there is an identifier, use the location of the identifier as the 8560 // location of the decl, otherwise use the location of the struct/union 8561 // keyword. 8562 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8563 8564 // Otherwise, create a new declaration. If there is a previous 8565 // declaration of the same entity, the two will be linked via 8566 // PrevDecl. 8567 TagDecl *New; 8568 8569 bool IsForwardReference = false; 8570 if (Kind == TTK_Enum) { 8571 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8572 // enum X { A, B, C } D; D should chain to X. 8573 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8574 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8575 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8576 // If this is an undefined enum, warn. 8577 if (TUK != TUK_Definition && !Invalid) { 8578 TagDecl *Def; 8579 if (getLangOpts().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8580 // C++0x: 7.2p2: opaque-enum-declaration. 8581 // Conflicts are diagnosed above. Do nothing. 8582 } 8583 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8584 Diag(Loc, diag::ext_forward_ref_enum_def) 8585 << New; 8586 Diag(Def->getLocation(), diag::note_previous_definition); 8587 } else { 8588 unsigned DiagID = diag::ext_forward_ref_enum; 8589 if (getLangOpts().MicrosoftMode) 8590 DiagID = diag::ext_ms_forward_ref_enum; 8591 else if (getLangOpts().CPlusPlus) 8592 DiagID = diag::err_forward_ref_enum; 8593 Diag(Loc, DiagID); 8594 8595 // If this is a forward-declared reference to an enumeration, make a 8596 // note of it; we won't actually be introducing the declaration into 8597 // the declaration context. 8598 if (TUK == TUK_Reference) 8599 IsForwardReference = true; 8600 } 8601 } 8602 8603 if (EnumUnderlying) { 8604 EnumDecl *ED = cast<EnumDecl>(New); 8605 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8606 ED->setIntegerTypeSourceInfo(TI); 8607 else 8608 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8609 ED->setPromotionType(ED->getIntegerType()); 8610 } 8611 8612 } else { 8613 // struct/union/class 8614 8615 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8616 // struct X { int A; } D; D should chain to X. 8617 if (getLangOpts().CPlusPlus) { 8618 // FIXME: Look for a way to use RecordDecl for simple structs. 8619 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8620 cast_or_null<CXXRecordDecl>(PrevDecl)); 8621 8622 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8623 StdBadAlloc = cast<CXXRecordDecl>(New); 8624 } else 8625 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8626 cast_or_null<RecordDecl>(PrevDecl)); 8627 } 8628 8629 // Maybe add qualifier info. 8630 if (SS.isNotEmpty()) { 8631 if (SS.isSet()) { 8632 // If this is either a declaration or a definition, check the 8633 // nested-name-specifier against the current context. We don't do this 8634 // for explicit specializations, because they have similar checking 8635 // (with more specific diagnostics) in the call to 8636 // CheckMemberSpecialization, below. 8637 if (!isExplicitSpecialization && 8638 (TUK == TUK_Definition || TUK == TUK_Declaration) && 8639 diagnoseQualifiedDeclaration(SS, DC, OrigName, NameLoc)) 8640 Invalid = true; 8641 8642 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8643 if (TemplateParameterLists.size() > 0) { 8644 New->setTemplateParameterListsInfo(Context, 8645 TemplateParameterLists.size(), 8646 (TemplateParameterList**) TemplateParameterLists.release()); 8647 } 8648 } 8649 else 8650 Invalid = true; 8651 } 8652 8653 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8654 // Add alignment attributes if necessary; these attributes are checked when 8655 // the ASTContext lays out the structure. 8656 // 8657 // It is important for implementing the correct semantics that this 8658 // happen here (in act on tag decl). The #pragma pack stack is 8659 // maintained as a result of parser callbacks which can occur at 8660 // many points during the parsing of a struct declaration (because 8661 // the #pragma tokens are effectively skipped over during the 8662 // parsing of the struct). 8663 AddAlignmentAttributesForRecord(RD); 8664 8665 AddMsStructLayoutForRecord(RD); 8666 } 8667 8668 if (ModulePrivateLoc.isValid()) { 8669 if (isExplicitSpecialization) 8670 Diag(New->getLocation(), diag::err_module_private_specialization) 8671 << 2 8672 << FixItHint::CreateRemoval(ModulePrivateLoc); 8673 // __module_private__ does not apply to local classes. However, we only 8674 // diagnose this as an error when the declaration specifiers are 8675 // freestanding. Here, we just ignore the __module_private__. 8676 else if (!SearchDC->isFunctionOrMethod()) 8677 New->setModulePrivate(); 8678 } 8679 8680 // If this is a specialization of a member class (of a class template), 8681 // check the specialization. 8682 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8683 Invalid = true; 8684 8685 if (Invalid) 8686 New->setInvalidDecl(); 8687 8688 if (Attr) 8689 ProcessDeclAttributeList(S, New, Attr); 8690 8691 // If we're declaring or defining a tag in function prototype scope 8692 // in C, note that this type can only be used within the function. 8693 if (Name && S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus) 8694 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8695 8696 // Set the lexical context. If the tag has a C++ scope specifier, the 8697 // lexical context will be different from the semantic context. 8698 New->setLexicalDeclContext(CurContext); 8699 8700 // Mark this as a friend decl if applicable. 8701 // In Microsoft mode, a friend declaration also acts as a forward 8702 // declaration so we always pass true to setObjectOfFriendDecl to make 8703 // the tag name visible. 8704 if (TUK == TUK_Friend) 8705 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8706 getLangOpts().MicrosoftExt); 8707 8708 // Set the access specifier. 8709 if (!Invalid && SearchDC->isRecord()) 8710 SetMemberAccessSpecifier(New, PrevDecl, AS); 8711 8712 if (TUK == TUK_Definition) 8713 New->startDefinition(); 8714 8715 // If this has an identifier, add it to the scope stack. 8716 if (TUK == TUK_Friend) { 8717 // We might be replacing an existing declaration in the lookup tables; 8718 // if so, borrow its access specifier. 8719 if (PrevDecl) 8720 New->setAccess(PrevDecl->getAccess()); 8721 8722 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8723 DC->makeDeclVisibleInContext(New); 8724 if (Name) // can be null along some error paths 8725 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8726 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8727 } else if (Name) { 8728 S = getNonFieldDeclScope(S); 8729 PushOnScopeChains(New, S, !IsForwardReference); 8730 if (IsForwardReference) 8731 SearchDC->makeDeclVisibleInContext(New); 8732 8733 } else { 8734 CurContext->addDecl(New); 8735 } 8736 8737 // If this is the C FILE type, notify the AST context. 8738 if (IdentifierInfo *II = New->getIdentifier()) 8739 if (!New->isInvalidDecl() && 8740 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8741 II->isStr("FILE")) 8742 Context.setFILEDecl(New); 8743 8744 // If we were in function prototype scope (and not in C++ mode), add this 8745 // tag to the list of decls to inject into the function definition scope. 8746 if (S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus && 8747 InFunctionDeclarator && Name) 8748 DeclsInPrototypeScope.push_back(New); 8749 8750 if (PrevDecl) 8751 mergeDeclAttributes(New, PrevDecl); 8752 8753 OwnedDecl = true; 8754 return New; 8755} 8756 8757void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8758 AdjustDeclIfTemplate(TagD); 8759 TagDecl *Tag = cast<TagDecl>(TagD); 8760 8761 // Enter the tag context. 8762 PushDeclContext(S, Tag); 8763} 8764 8765Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8766 assert(isa<ObjCContainerDecl>(IDecl) && 8767 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8768 DeclContext *OCD = cast<DeclContext>(IDecl); 8769 assert(getContainingDC(OCD) == CurContext && 8770 "The next DeclContext should be lexically contained in the current one."); 8771 CurContext = OCD; 8772 return IDecl; 8773} 8774 8775void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8776 SourceLocation FinalLoc, 8777 SourceLocation LBraceLoc) { 8778 AdjustDeclIfTemplate(TagD); 8779 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8780 8781 FieldCollector->StartClass(); 8782 8783 if (!Record->getIdentifier()) 8784 return; 8785 8786 if (FinalLoc.isValid()) 8787 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8788 8789 // C++ [class]p2: 8790 // [...] The class-name is also inserted into the scope of the 8791 // class itself; this is known as the injected-class-name. For 8792 // purposes of access checking, the injected-class-name is treated 8793 // as if it were a public member name. 8794 CXXRecordDecl *InjectedClassName 8795 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8796 Record->getLocStart(), Record->getLocation(), 8797 Record->getIdentifier(), 8798 /*PrevDecl=*/0, 8799 /*DelayTypeCreation=*/true); 8800 Context.getTypeDeclType(InjectedClassName, Record); 8801 InjectedClassName->setImplicit(); 8802 InjectedClassName->setAccess(AS_public); 8803 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8804 InjectedClassName->setDescribedClassTemplate(Template); 8805 PushOnScopeChains(InjectedClassName, S); 8806 assert(InjectedClassName->isInjectedClassName() && 8807 "Broken injected-class-name"); 8808} 8809 8810void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8811 SourceLocation RBraceLoc) { 8812 AdjustDeclIfTemplate(TagD); 8813 TagDecl *Tag = cast<TagDecl>(TagD); 8814 Tag->setRBraceLoc(RBraceLoc); 8815 8816 // Make sure we "complete" the definition even it is invalid. 8817 if (Tag->isBeingDefined()) { 8818 assert(Tag->isInvalidDecl() && "We should already have completed it"); 8819 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 8820 RD->completeDefinition(); 8821 } 8822 8823 if (isa<CXXRecordDecl>(Tag)) 8824 FieldCollector->FinishClass(); 8825 8826 // Exit this scope of this tag's definition. 8827 PopDeclContext(); 8828 8829 // Notify the consumer that we've defined a tag. 8830 Consumer.HandleTagDeclDefinition(Tag); 8831} 8832 8833void Sema::ActOnObjCContainerFinishDefinition() { 8834 // Exit this scope of this interface definition. 8835 PopDeclContext(); 8836} 8837 8838void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8839 assert(DC == CurContext && "Mismatch of container contexts"); 8840 OriginalLexicalContext = DC; 8841 ActOnObjCContainerFinishDefinition(); 8842} 8843 8844void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8845 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8846 OriginalLexicalContext = 0; 8847} 8848 8849void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8850 AdjustDeclIfTemplate(TagD); 8851 TagDecl *Tag = cast<TagDecl>(TagD); 8852 Tag->setInvalidDecl(); 8853 8854 // Make sure we "complete" the definition even it is invalid. 8855 if (Tag->isBeingDefined()) { 8856 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 8857 RD->completeDefinition(); 8858 } 8859 8860 // We're undoing ActOnTagStartDefinition here, not 8861 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8862 // the FieldCollector. 8863 8864 PopDeclContext(); 8865} 8866 8867// Note that FieldName may be null for anonymous bitfields. 8868ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 8869 IdentifierInfo *FieldName, 8870 QualType FieldTy, Expr *BitWidth, 8871 bool *ZeroWidth) { 8872 // Default to true; that shouldn't confuse checks for emptiness 8873 if (ZeroWidth) 8874 *ZeroWidth = true; 8875 8876 // C99 6.7.2.1p4 - verify the field type. 8877 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8878 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8879 // Handle incomplete types with specific error. 8880 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8881 return ExprError(); 8882 if (FieldName) 8883 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8884 << FieldName << FieldTy << BitWidth->getSourceRange(); 8885 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8886 << FieldTy << BitWidth->getSourceRange(); 8887 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8888 UPPC_BitFieldWidth)) 8889 return ExprError(); 8890 8891 // If the bit-width is type- or value-dependent, don't try to check 8892 // it now. 8893 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8894 return Owned(BitWidth); 8895 8896 llvm::APSInt Value; 8897 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 8898 if (ICE.isInvalid()) 8899 return ICE; 8900 BitWidth = ICE.take(); 8901 8902 if (Value != 0 && ZeroWidth) 8903 *ZeroWidth = false; 8904 8905 // Zero-width bitfield is ok for anonymous field. 8906 if (Value == 0 && FieldName) 8907 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8908 8909 if (Value.isSigned() && Value.isNegative()) { 8910 if (FieldName) 8911 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8912 << FieldName << Value.toString(10); 8913 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8914 << Value.toString(10); 8915 } 8916 8917 if (!FieldTy->isDependentType()) { 8918 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8919 if (Value.getZExtValue() > TypeSize) { 8920 if (!getLangOpts().CPlusPlus) { 8921 if (FieldName) 8922 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8923 << FieldName << (unsigned)Value.getZExtValue() 8924 << (unsigned)TypeSize; 8925 8926 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8927 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8928 } 8929 8930 if (FieldName) 8931 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8932 << FieldName << (unsigned)Value.getZExtValue() 8933 << (unsigned)TypeSize; 8934 else 8935 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8936 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8937 } 8938 } 8939 8940 return Owned(BitWidth); 8941} 8942 8943/// ActOnField - Each field of a C struct/union is passed into this in order 8944/// to create a FieldDecl object for it. 8945Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8946 Declarator &D, Expr *BitfieldWidth) { 8947 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8948 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8949 /*HasInit=*/false, AS_public); 8950 return Res; 8951} 8952 8953/// HandleField - Analyze a field of a C struct or a C++ data member. 8954/// 8955FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8956 SourceLocation DeclStart, 8957 Declarator &D, Expr *BitWidth, bool HasInit, 8958 AccessSpecifier AS) { 8959 IdentifierInfo *II = D.getIdentifier(); 8960 SourceLocation Loc = DeclStart; 8961 if (II) Loc = D.getIdentifierLoc(); 8962 8963 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8964 QualType T = TInfo->getType(); 8965 if (getLangOpts().CPlusPlus) { 8966 CheckExtraCXXDefaultArguments(D); 8967 8968 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8969 UPPC_DataMemberType)) { 8970 D.setInvalidType(); 8971 T = Context.IntTy; 8972 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8973 } 8974 } 8975 8976 DiagnoseFunctionSpecifiers(D); 8977 8978 if (D.getDeclSpec().isThreadSpecified()) 8979 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8980 if (D.getDeclSpec().isConstexprSpecified()) 8981 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8982 << 2; 8983 8984 // Check to see if this name was declared as a member previously 8985 NamedDecl *PrevDecl = 0; 8986 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8987 LookupName(Previous, S); 8988 switch (Previous.getResultKind()) { 8989 case LookupResult::Found: 8990 case LookupResult::FoundUnresolvedValue: 8991 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8992 break; 8993 8994 case LookupResult::FoundOverloaded: 8995 PrevDecl = Previous.getRepresentativeDecl(); 8996 break; 8997 8998 case LookupResult::NotFound: 8999 case LookupResult::NotFoundInCurrentInstantiation: 9000 case LookupResult::Ambiguous: 9001 break; 9002 } 9003 Previous.suppressDiagnostics(); 9004 9005 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9006 // Maybe we will complain about the shadowed template parameter. 9007 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9008 // Just pretend that we didn't see the previous declaration. 9009 PrevDecl = 0; 9010 } 9011 9012 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 9013 PrevDecl = 0; 9014 9015 bool Mutable 9016 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 9017 SourceLocation TSSL = D.getLocStart(); 9018 FieldDecl *NewFD 9019 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 9020 TSSL, AS, PrevDecl, &D); 9021 9022 if (NewFD->isInvalidDecl()) 9023 Record->setInvalidDecl(); 9024 9025 if (D.getDeclSpec().isModulePrivateSpecified()) 9026 NewFD->setModulePrivate(); 9027 9028 if (NewFD->isInvalidDecl() && PrevDecl) { 9029 // Don't introduce NewFD into scope; there's already something 9030 // with the same name in the same scope. 9031 } else if (II) { 9032 PushOnScopeChains(NewFD, S); 9033 } else 9034 Record->addDecl(NewFD); 9035 9036 return NewFD; 9037} 9038 9039/// \brief Build a new FieldDecl and check its well-formedness. 9040/// 9041/// This routine builds a new FieldDecl given the fields name, type, 9042/// record, etc. \p PrevDecl should refer to any previous declaration 9043/// with the same name and in the same scope as the field to be 9044/// created. 9045/// 9046/// \returns a new FieldDecl. 9047/// 9048/// \todo The Declarator argument is a hack. It will be removed once 9049FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 9050 TypeSourceInfo *TInfo, 9051 RecordDecl *Record, SourceLocation Loc, 9052 bool Mutable, Expr *BitWidth, bool HasInit, 9053 SourceLocation TSSL, 9054 AccessSpecifier AS, NamedDecl *PrevDecl, 9055 Declarator *D) { 9056 IdentifierInfo *II = Name.getAsIdentifierInfo(); 9057 bool InvalidDecl = false; 9058 if (D) InvalidDecl = D->isInvalidType(); 9059 9060 // If we receive a broken type, recover by assuming 'int' and 9061 // marking this declaration as invalid. 9062 if (T.isNull()) { 9063 InvalidDecl = true; 9064 T = Context.IntTy; 9065 } 9066 9067 QualType EltTy = Context.getBaseElementType(T); 9068 if (!EltTy->isDependentType()) { 9069 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 9070 // Fields of incomplete type force their record to be invalid. 9071 Record->setInvalidDecl(); 9072 InvalidDecl = true; 9073 } else { 9074 NamedDecl *Def; 9075 EltTy->isIncompleteType(&Def); 9076 if (Def && Def->isInvalidDecl()) { 9077 Record->setInvalidDecl(); 9078 InvalidDecl = true; 9079 } 9080 } 9081 } 9082 9083 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9084 // than a variably modified type. 9085 if (!InvalidDecl && T->isVariablyModifiedType()) { 9086 bool SizeIsNegative; 9087 llvm::APSInt Oversized; 9088 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 9089 SizeIsNegative, 9090 Oversized); 9091 if (!FixedTy.isNull()) { 9092 Diag(Loc, diag::warn_illegal_constant_array_size); 9093 T = FixedTy; 9094 } else { 9095 if (SizeIsNegative) 9096 Diag(Loc, diag::err_typecheck_negative_array_size); 9097 else if (Oversized.getBoolValue()) 9098 Diag(Loc, diag::err_array_too_large) 9099 << Oversized.toString(10); 9100 else 9101 Diag(Loc, diag::err_typecheck_field_variable_size); 9102 InvalidDecl = true; 9103 } 9104 } 9105 9106 // Fields can not have abstract class types 9107 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 9108 diag::err_abstract_type_in_decl, 9109 AbstractFieldType)) 9110 InvalidDecl = true; 9111 9112 bool ZeroWidth = false; 9113 // If this is declared as a bit-field, check the bit-field. 9114 if (!InvalidDecl && BitWidth) { 9115 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 9116 if (!BitWidth) { 9117 InvalidDecl = true; 9118 BitWidth = 0; 9119 ZeroWidth = false; 9120 } 9121 } 9122 9123 // Check that 'mutable' is consistent with the type of the declaration. 9124 if (!InvalidDecl && Mutable) { 9125 unsigned DiagID = 0; 9126 if (T->isReferenceType()) 9127 DiagID = diag::err_mutable_reference; 9128 else if (T.isConstQualified()) 9129 DiagID = diag::err_mutable_const; 9130 9131 if (DiagID) { 9132 SourceLocation ErrLoc = Loc; 9133 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 9134 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 9135 Diag(ErrLoc, DiagID); 9136 Mutable = false; 9137 InvalidDecl = true; 9138 } 9139 } 9140 9141 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 9142 BitWidth, Mutable, HasInit); 9143 if (InvalidDecl) 9144 NewFD->setInvalidDecl(); 9145 9146 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 9147 Diag(Loc, diag::err_duplicate_member) << II; 9148 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9149 NewFD->setInvalidDecl(); 9150 } 9151 9152 if (!InvalidDecl && getLangOpts().CPlusPlus) { 9153 if (Record->isUnion()) { 9154 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9155 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9156 if (RDecl->getDefinition()) { 9157 // C++ [class.union]p1: An object of a class with a non-trivial 9158 // constructor, a non-trivial copy constructor, a non-trivial 9159 // destructor, or a non-trivial copy assignment operator 9160 // cannot be a member of a union, nor can an array of such 9161 // objects. 9162 if (CheckNontrivialField(NewFD)) 9163 NewFD->setInvalidDecl(); 9164 } 9165 } 9166 9167 // C++ [class.union]p1: If a union contains a member of reference type, 9168 // the program is ill-formed. 9169 if (EltTy->isReferenceType()) { 9170 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 9171 << NewFD->getDeclName() << EltTy; 9172 NewFD->setInvalidDecl(); 9173 } 9174 } 9175 } 9176 9177 // FIXME: We need to pass in the attributes given an AST 9178 // representation, not a parser representation. 9179 if (D) 9180 // FIXME: What to pass instead of TUScope? 9181 ProcessDeclAttributes(TUScope, NewFD, *D); 9182 9183 // In auto-retain/release, infer strong retension for fields of 9184 // retainable type. 9185 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 9186 NewFD->setInvalidDecl(); 9187 9188 if (T.isObjCGCWeak()) 9189 Diag(Loc, diag::warn_attribute_weak_on_field); 9190 9191 NewFD->setAccess(AS); 9192 return NewFD; 9193} 9194 9195bool Sema::CheckNontrivialField(FieldDecl *FD) { 9196 assert(FD); 9197 assert(getLangOpts().CPlusPlus && "valid check only for C++"); 9198 9199 if (FD->isInvalidDecl()) 9200 return true; 9201 9202 QualType EltTy = Context.getBaseElementType(FD->getType()); 9203 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9204 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9205 if (RDecl->getDefinition()) { 9206 // We check for copy constructors before constructors 9207 // because otherwise we'll never get complaints about 9208 // copy constructors. 9209 9210 CXXSpecialMember member = CXXInvalid; 9211 if (!RDecl->hasTrivialCopyConstructor()) 9212 member = CXXCopyConstructor; 9213 else if (!RDecl->hasTrivialDefaultConstructor()) 9214 member = CXXDefaultConstructor; 9215 else if (!RDecl->hasTrivialCopyAssignment()) 9216 member = CXXCopyAssignment; 9217 else if (!RDecl->hasTrivialDestructor()) 9218 member = CXXDestructor; 9219 9220 if (member != CXXInvalid) { 9221 if (!getLangOpts().CPlusPlus0x && 9222 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) { 9223 // Objective-C++ ARC: it is an error to have a non-trivial field of 9224 // a union. However, system headers in Objective-C programs 9225 // occasionally have Objective-C lifetime objects within unions, 9226 // and rather than cause the program to fail, we make those 9227 // members unavailable. 9228 SourceLocation Loc = FD->getLocation(); 9229 if (getSourceManager().isInSystemHeader(Loc)) { 9230 if (!FD->hasAttr<UnavailableAttr>()) 9231 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 9232 "this system field has retaining ownership")); 9233 return false; 9234 } 9235 } 9236 9237 Diag(FD->getLocation(), getLangOpts().CPlusPlus0x ? 9238 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 9239 diag::err_illegal_union_or_anon_struct_member) 9240 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 9241 DiagnoseNontrivial(RT, member); 9242 return !getLangOpts().CPlusPlus0x; 9243 } 9244 } 9245 } 9246 9247 return false; 9248} 9249 9250/// If the given constructor is user-provided, produce a diagnostic explaining 9251/// that it makes the class non-trivial. 9252static bool DiagnoseNontrivialUserProvidedCtor(Sema &S, QualType QT, 9253 CXXConstructorDecl *CD, 9254 Sema::CXXSpecialMember CSM) { 9255 if (!CD->isUserProvided()) 9256 return false; 9257 9258 SourceLocation CtorLoc = CD->getLocation(); 9259 S.Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << CSM; 9260 return true; 9261} 9262 9263/// DiagnoseNontrivial - Given that a class has a non-trivial 9264/// special member, figure out why. 9265void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 9266 QualType QT(T, 0U); 9267 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 9268 9269 // Check whether the member was user-declared. 9270 switch (member) { 9271 case CXXInvalid: 9272 break; 9273 9274 case CXXDefaultConstructor: 9275 if (RD->hasUserDeclaredConstructor()) { 9276 typedef CXXRecordDecl::ctor_iterator ctor_iter; 9277 for (ctor_iter CI = RD->ctor_begin(), CE = RD->ctor_end(); CI != CE; ++CI) 9278 if (DiagnoseNontrivialUserProvidedCtor(*this, QT, &*CI, member)) 9279 return; 9280 9281 // No user-provided constructors; look for constructor templates. 9282 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 9283 tmpl_iter; 9284 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); 9285 TI != TE; ++TI) { 9286 CXXConstructorDecl *CD = 9287 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()); 9288 if (CD && DiagnoseNontrivialUserProvidedCtor(*this, QT, CD, member)) 9289 return; 9290 } 9291 } 9292 break; 9293 9294 case CXXCopyConstructor: 9295 if (RD->hasUserDeclaredCopyConstructor()) { 9296 SourceLocation CtorLoc = 9297 RD->getCopyConstructor(0)->getLocation(); 9298 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9299 return; 9300 } 9301 break; 9302 9303 case CXXMoveConstructor: 9304 if (RD->hasUserDeclaredMoveConstructor()) { 9305 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 9306 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9307 return; 9308 } 9309 break; 9310 9311 case CXXCopyAssignment: 9312 if (RD->hasUserDeclaredCopyAssignment()) { 9313 // FIXME: this should use the location of the copy 9314 // assignment, not the type. 9315 SourceLocation TyLoc = RD->getLocStart(); 9316 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 9317 return; 9318 } 9319 break; 9320 9321 case CXXMoveAssignment: 9322 if (RD->hasUserDeclaredMoveAssignment()) { 9323 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 9324 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9325 return; 9326 } 9327 break; 9328 9329 case CXXDestructor: 9330 if (RD->hasUserDeclaredDestructor()) { 9331 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 9332 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9333 return; 9334 } 9335 break; 9336 } 9337 9338 typedef CXXRecordDecl::base_class_iterator base_iter; 9339 9340 // Virtual bases and members inhibit trivial copying/construction, 9341 // but not trivial destruction. 9342 if (member != CXXDestructor) { 9343 // Check for virtual bases. vbases includes indirect virtual bases, 9344 // so we just iterate through the direct bases. 9345 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 9346 if (bi->isVirtual()) { 9347 SourceLocation BaseLoc = bi->getLocStart(); 9348 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 9349 return; 9350 } 9351 9352 // Check for virtual methods. 9353 typedef CXXRecordDecl::method_iterator meth_iter; 9354 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 9355 ++mi) { 9356 if (mi->isVirtual()) { 9357 SourceLocation MLoc = mi->getLocStart(); 9358 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 9359 return; 9360 } 9361 } 9362 } 9363 9364 bool (CXXRecordDecl::*hasTrivial)() const; 9365 switch (member) { 9366 case CXXDefaultConstructor: 9367 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 9368 case CXXCopyConstructor: 9369 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 9370 case CXXCopyAssignment: 9371 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 9372 case CXXDestructor: 9373 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 9374 default: 9375 llvm_unreachable("unexpected special member"); 9376 } 9377 9378 // Check for nontrivial bases (and recurse). 9379 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 9380 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 9381 assert(BaseRT && "Don't know how to handle dependent bases"); 9382 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 9383 if (!(BaseRecTy->*hasTrivial)()) { 9384 SourceLocation BaseLoc = bi->getLocStart(); 9385 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 9386 DiagnoseNontrivial(BaseRT, member); 9387 return; 9388 } 9389 } 9390 9391 // Check for nontrivial members (and recurse). 9392 typedef RecordDecl::field_iterator field_iter; 9393 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 9394 ++fi) { 9395 QualType EltTy = Context.getBaseElementType(fi->getType()); 9396 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 9397 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 9398 9399 if (!(EltRD->*hasTrivial)()) { 9400 SourceLocation FLoc = fi->getLocation(); 9401 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 9402 DiagnoseNontrivial(EltRT, member); 9403 return; 9404 } 9405 } 9406 9407 if (EltTy->isObjCLifetimeType()) { 9408 switch (EltTy.getObjCLifetime()) { 9409 case Qualifiers::OCL_None: 9410 case Qualifiers::OCL_ExplicitNone: 9411 break; 9412 9413 case Qualifiers::OCL_Autoreleasing: 9414 case Qualifiers::OCL_Weak: 9415 case Qualifiers::OCL_Strong: 9416 Diag(fi->getLocation(), diag::note_nontrivial_objc_ownership) 9417 << QT << EltTy.getObjCLifetime(); 9418 return; 9419 } 9420 } 9421 } 9422 9423 llvm_unreachable("found no explanation for non-trivial member"); 9424} 9425 9426/// TranslateIvarVisibility - Translate visibility from a token ID to an 9427/// AST enum value. 9428static ObjCIvarDecl::AccessControl 9429TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9430 switch (ivarVisibility) { 9431 default: llvm_unreachable("Unknown visitibility kind"); 9432 case tok::objc_private: return ObjCIvarDecl::Private; 9433 case tok::objc_public: return ObjCIvarDecl::Public; 9434 case tok::objc_protected: return ObjCIvarDecl::Protected; 9435 case tok::objc_package: return ObjCIvarDecl::Package; 9436 } 9437} 9438 9439/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9440/// in order to create an IvarDecl object for it. 9441Decl *Sema::ActOnIvar(Scope *S, 9442 SourceLocation DeclStart, 9443 Declarator &D, Expr *BitfieldWidth, 9444 tok::ObjCKeywordKind Visibility) { 9445 9446 IdentifierInfo *II = D.getIdentifier(); 9447 Expr *BitWidth = (Expr*)BitfieldWidth; 9448 SourceLocation Loc = DeclStart; 9449 if (II) Loc = D.getIdentifierLoc(); 9450 9451 // FIXME: Unnamed fields can be handled in various different ways, for 9452 // example, unnamed unions inject all members into the struct namespace! 9453 9454 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9455 QualType T = TInfo->getType(); 9456 9457 if (BitWidth) { 9458 // 6.7.2.1p3, 6.7.2.1p4 9459 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9460 if (!BitWidth) 9461 D.setInvalidType(); 9462 } else { 9463 // Not a bitfield. 9464 9465 // validate II. 9466 9467 } 9468 if (T->isReferenceType()) { 9469 Diag(Loc, diag::err_ivar_reference_type); 9470 D.setInvalidType(); 9471 } 9472 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9473 // than a variably modified type. 9474 else if (T->isVariablyModifiedType()) { 9475 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9476 D.setInvalidType(); 9477 } 9478 9479 // Get the visibility (access control) for this ivar. 9480 ObjCIvarDecl::AccessControl ac = 9481 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9482 : ObjCIvarDecl::None; 9483 // Must set ivar's DeclContext to its enclosing interface. 9484 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9485 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9486 return 0; 9487 ObjCContainerDecl *EnclosingContext; 9488 if (ObjCImplementationDecl *IMPDecl = 9489 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9490 if (!LangOpts.ObjCNonFragileABI2) { 9491 // Case of ivar declared in an implementation. Context is that of its class. 9492 EnclosingContext = IMPDecl->getClassInterface(); 9493 assert(EnclosingContext && "Implementation has no class interface!"); 9494 } 9495 else 9496 EnclosingContext = EnclosingDecl; 9497 } else { 9498 if (ObjCCategoryDecl *CDecl = 9499 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9500 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9501 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9502 return 0; 9503 } 9504 } 9505 EnclosingContext = EnclosingDecl; 9506 } 9507 9508 // Construct the decl. 9509 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9510 DeclStart, Loc, II, T, 9511 TInfo, ac, (Expr *)BitfieldWidth); 9512 9513 if (II) { 9514 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9515 ForRedeclaration); 9516 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9517 && !isa<TagDecl>(PrevDecl)) { 9518 Diag(Loc, diag::err_duplicate_member) << II; 9519 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9520 NewID->setInvalidDecl(); 9521 } 9522 } 9523 9524 // Process attributes attached to the ivar. 9525 ProcessDeclAttributes(S, NewID, D); 9526 9527 if (D.isInvalidType()) 9528 NewID->setInvalidDecl(); 9529 9530 // In ARC, infer 'retaining' for ivars of retainable type. 9531 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9532 NewID->setInvalidDecl(); 9533 9534 if (D.getDeclSpec().isModulePrivateSpecified()) 9535 NewID->setModulePrivate(); 9536 9537 if (II) { 9538 // FIXME: When interfaces are DeclContexts, we'll need to add 9539 // these to the interface. 9540 S->AddDecl(NewID); 9541 IdResolver.AddDecl(NewID); 9542 } 9543 9544 return NewID; 9545} 9546 9547/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9548/// class and class extensions. For every class @interface and class 9549/// extension @interface, if the last ivar is a bitfield of any type, 9550/// then add an implicit `char :0` ivar to the end of that interface. 9551void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9552 SmallVectorImpl<Decl *> &AllIvarDecls) { 9553 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9554 return; 9555 9556 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9557 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9558 9559 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9560 return; 9561 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9562 if (!ID) { 9563 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9564 if (!CD->IsClassExtension()) 9565 return; 9566 } 9567 // No need to add this to end of @implementation. 9568 else 9569 return; 9570 } 9571 // All conditions are met. Add a new bitfield to the tail end of ivars. 9572 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9573 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9574 9575 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9576 DeclLoc, DeclLoc, 0, 9577 Context.CharTy, 9578 Context.getTrivialTypeSourceInfo(Context.CharTy, 9579 DeclLoc), 9580 ObjCIvarDecl::Private, BW, 9581 true); 9582 AllIvarDecls.push_back(Ivar); 9583} 9584 9585void Sema::ActOnFields(Scope* S, 9586 SourceLocation RecLoc, Decl *EnclosingDecl, 9587 llvm::ArrayRef<Decl *> Fields, 9588 SourceLocation LBrac, SourceLocation RBrac, 9589 AttributeList *Attr) { 9590 assert(EnclosingDecl && "missing record or interface decl"); 9591 9592 // If the decl this is being inserted into is invalid, then it may be a 9593 // redeclaration or some other bogus case. Don't try to add fields to it. 9594 if (EnclosingDecl->isInvalidDecl()) 9595 return; 9596 9597 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9598 9599 // Start counting up the number of named members; make sure to include 9600 // members of anonymous structs and unions in the total. 9601 unsigned NumNamedMembers = 0; 9602 if (Record) { 9603 for (RecordDecl::decl_iterator i = Record->decls_begin(), 9604 e = Record->decls_end(); i != e; i++) { 9605 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i)) 9606 if (IFD->getDeclName()) 9607 ++NumNamedMembers; 9608 } 9609 } 9610 9611 // Verify that all the fields are okay. 9612 SmallVector<FieldDecl*, 32> RecFields; 9613 9614 bool ARCErrReported = false; 9615 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9616 i != end; ++i) { 9617 FieldDecl *FD = cast<FieldDecl>(*i); 9618 9619 // Get the type for the field. 9620 const Type *FDTy = FD->getType().getTypePtr(); 9621 9622 if (!FD->isAnonymousStructOrUnion()) { 9623 // Remember all fields written by the user. 9624 RecFields.push_back(FD); 9625 } 9626 9627 // If the field is already invalid for some reason, don't emit more 9628 // diagnostics about it. 9629 if (FD->isInvalidDecl()) { 9630 EnclosingDecl->setInvalidDecl(); 9631 continue; 9632 } 9633 9634 // C99 6.7.2.1p2: 9635 // A structure or union shall not contain a member with 9636 // incomplete or function type (hence, a structure shall not 9637 // contain an instance of itself, but may contain a pointer to 9638 // an instance of itself), except that the last member of a 9639 // structure with more than one named member may have incomplete 9640 // array type; such a structure (and any union containing, 9641 // possibly recursively, a member that is such a structure) 9642 // shall not be a member of a structure or an element of an 9643 // array. 9644 if (FDTy->isFunctionType()) { 9645 // Field declared as a function. 9646 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9647 << FD->getDeclName(); 9648 FD->setInvalidDecl(); 9649 EnclosingDecl->setInvalidDecl(); 9650 continue; 9651 } else if (FDTy->isIncompleteArrayType() && Record && 9652 ((i + 1 == Fields.end() && !Record->isUnion()) || 9653 ((getLangOpts().MicrosoftExt || 9654 getLangOpts().CPlusPlus) && 9655 (i + 1 == Fields.end() || Record->isUnion())))) { 9656 // Flexible array member. 9657 // Microsoft and g++ is more permissive regarding flexible array. 9658 // It will accept flexible array in union and also 9659 // as the sole element of a struct/class. 9660 if (getLangOpts().MicrosoftExt) { 9661 if (Record->isUnion()) 9662 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9663 << FD->getDeclName(); 9664 else if (Fields.size() == 1) 9665 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9666 << FD->getDeclName() << Record->getTagKind(); 9667 } else if (getLangOpts().CPlusPlus) { 9668 if (Record->isUnion()) 9669 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9670 << FD->getDeclName(); 9671 else if (Fields.size() == 1) 9672 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9673 << FD->getDeclName() << Record->getTagKind(); 9674 } else if (!getLangOpts().C99) { 9675 if (Record->isUnion()) 9676 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9677 << FD->getDeclName(); 9678 else 9679 Diag(FD->getLocation(), diag::ext_c99_flexible_array_member) 9680 << FD->getDeclName() << Record->getTagKind(); 9681 } else if (NumNamedMembers < 1) { 9682 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9683 << FD->getDeclName(); 9684 FD->setInvalidDecl(); 9685 EnclosingDecl->setInvalidDecl(); 9686 continue; 9687 } 9688 if (!FD->getType()->isDependentType() && 9689 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9690 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9691 << FD->getDeclName() << FD->getType(); 9692 FD->setInvalidDecl(); 9693 EnclosingDecl->setInvalidDecl(); 9694 continue; 9695 } 9696 // Okay, we have a legal flexible array member at the end of the struct. 9697 if (Record) 9698 Record->setHasFlexibleArrayMember(true); 9699 } else if (!FDTy->isDependentType() && 9700 RequireCompleteType(FD->getLocation(), FD->getType(), 9701 diag::err_field_incomplete)) { 9702 // Incomplete type 9703 FD->setInvalidDecl(); 9704 EnclosingDecl->setInvalidDecl(); 9705 continue; 9706 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9707 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9708 // If this is a member of a union, then entire union becomes "flexible". 9709 if (Record && Record->isUnion()) { 9710 Record->setHasFlexibleArrayMember(true); 9711 } else { 9712 // If this is a struct/class and this is not the last element, reject 9713 // it. Note that GCC supports variable sized arrays in the middle of 9714 // structures. 9715 if (i + 1 != Fields.end()) 9716 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9717 << FD->getDeclName() << FD->getType(); 9718 else { 9719 // We support flexible arrays at the end of structs in 9720 // other structs as an extension. 9721 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9722 << FD->getDeclName(); 9723 if (Record) 9724 Record->setHasFlexibleArrayMember(true); 9725 } 9726 } 9727 } 9728 if (Record && FDTTy->getDecl()->hasObjectMember()) 9729 Record->setHasObjectMember(true); 9730 } else if (FDTy->isObjCObjectType()) { 9731 /// A field cannot be an Objective-c object 9732 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9733 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9734 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9735 FD->setType(T); 9736 } 9737 else if (!getLangOpts().CPlusPlus) { 9738 if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported) { 9739 // It's an error in ARC if a field has lifetime. 9740 // We don't want to report this in a system header, though, 9741 // so we just make the field unavailable. 9742 // FIXME: that's really not sufficient; we need to make the type 9743 // itself invalid to, say, initialize or copy. 9744 QualType T = FD->getType(); 9745 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9746 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9747 SourceLocation loc = FD->getLocation(); 9748 if (getSourceManager().isInSystemHeader(loc)) { 9749 if (!FD->hasAttr<UnavailableAttr>()) { 9750 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9751 "this system field has retaining ownership")); 9752 } 9753 } else { 9754 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9755 << T->isBlockPointerType(); 9756 } 9757 ARCErrReported = true; 9758 } 9759 } 9760 else if (getLangOpts().ObjC1 && 9761 getLangOpts().getGC() != LangOptions::NonGC && 9762 Record && !Record->hasObjectMember()) { 9763 if (FD->getType()->isObjCObjectPointerType() || 9764 FD->getType().isObjCGCStrong()) 9765 Record->setHasObjectMember(true); 9766 else if (Context.getAsArrayType(FD->getType())) { 9767 QualType BaseType = Context.getBaseElementType(FD->getType()); 9768 if (BaseType->isRecordType() && 9769 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9770 Record->setHasObjectMember(true); 9771 else if (BaseType->isObjCObjectPointerType() || 9772 BaseType.isObjCGCStrong()) 9773 Record->setHasObjectMember(true); 9774 } 9775 } 9776 } 9777 // Keep track of the number of named members. 9778 if (FD->getIdentifier()) 9779 ++NumNamedMembers; 9780 } 9781 9782 // Okay, we successfully defined 'Record'. 9783 if (Record) { 9784 bool Completed = false; 9785 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9786 if (!CXXRecord->isInvalidDecl()) { 9787 // Set access bits correctly on the directly-declared conversions. 9788 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9789 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9790 I != E; ++I) 9791 Convs->setAccess(I, (*I)->getAccess()); 9792 9793 if (!CXXRecord->isDependentType()) { 9794 // Objective-C Automatic Reference Counting: 9795 // If a class has a non-static data member of Objective-C pointer 9796 // type (or array thereof), it is a non-POD type and its 9797 // default constructor (if any), copy constructor, copy assignment 9798 // operator, and destructor are non-trivial. 9799 // 9800 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9801 // However, here we check whether this particular class is only 9802 // non-POD because of the presence of an Objective-C pointer member. 9803 // If so, objects of this type cannot be shared between code compiled 9804 // with instant objects and code compiled with manual retain/release. 9805 if (getLangOpts().ObjCAutoRefCount && 9806 CXXRecord->hasObjectMember() && 9807 CXXRecord->getLinkage() == ExternalLinkage) { 9808 if (CXXRecord->isPOD()) { 9809 Diag(CXXRecord->getLocation(), 9810 diag::warn_arc_non_pod_class_with_object_member) 9811 << CXXRecord; 9812 } else { 9813 // FIXME: Fix-Its would be nice here, but finding a good location 9814 // for them is going to be tricky. 9815 if (CXXRecord->hasTrivialCopyConstructor()) 9816 Diag(CXXRecord->getLocation(), 9817 diag::warn_arc_trivial_member_function_with_object_member) 9818 << CXXRecord << 0; 9819 if (CXXRecord->hasTrivialCopyAssignment()) 9820 Diag(CXXRecord->getLocation(), 9821 diag::warn_arc_trivial_member_function_with_object_member) 9822 << CXXRecord << 1; 9823 if (CXXRecord->hasTrivialDestructor()) 9824 Diag(CXXRecord->getLocation(), 9825 diag::warn_arc_trivial_member_function_with_object_member) 9826 << CXXRecord << 2; 9827 } 9828 } 9829 9830 // Adjust user-defined destructor exception spec. 9831 if (getLangOpts().CPlusPlus0x && 9832 CXXRecord->hasUserDeclaredDestructor()) 9833 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9834 9835 // Add any implicitly-declared members to this class. 9836 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9837 9838 // If we have virtual base classes, we may end up finding multiple 9839 // final overriders for a given virtual function. Check for this 9840 // problem now. 9841 if (CXXRecord->getNumVBases()) { 9842 CXXFinalOverriderMap FinalOverriders; 9843 CXXRecord->getFinalOverriders(FinalOverriders); 9844 9845 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9846 MEnd = FinalOverriders.end(); 9847 M != MEnd; ++M) { 9848 for (OverridingMethods::iterator SO = M->second.begin(), 9849 SOEnd = M->second.end(); 9850 SO != SOEnd; ++SO) { 9851 assert(SO->second.size() > 0 && 9852 "Virtual function without overridding functions?"); 9853 if (SO->second.size() == 1) 9854 continue; 9855 9856 // C++ [class.virtual]p2: 9857 // In a derived class, if a virtual member function of a base 9858 // class subobject has more than one final overrider the 9859 // program is ill-formed. 9860 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9861 << (NamedDecl *)M->first << Record; 9862 Diag(M->first->getLocation(), 9863 diag::note_overridden_virtual_function); 9864 for (OverridingMethods::overriding_iterator 9865 OM = SO->second.begin(), 9866 OMEnd = SO->second.end(); 9867 OM != OMEnd; ++OM) 9868 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9869 << (NamedDecl *)M->first << OM->Method->getParent(); 9870 9871 Record->setInvalidDecl(); 9872 } 9873 } 9874 CXXRecord->completeDefinition(&FinalOverriders); 9875 Completed = true; 9876 } 9877 } 9878 } 9879 } 9880 9881 if (!Completed) 9882 Record->completeDefinition(); 9883 9884 } else { 9885 ObjCIvarDecl **ClsFields = 9886 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9887 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9888 ID->setEndOfDefinitionLoc(RBrac); 9889 // Add ivar's to class's DeclContext. 9890 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9891 ClsFields[i]->setLexicalDeclContext(ID); 9892 ID->addDecl(ClsFields[i]); 9893 } 9894 // Must enforce the rule that ivars in the base classes may not be 9895 // duplicates. 9896 if (ID->getSuperClass()) 9897 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9898 } else if (ObjCImplementationDecl *IMPDecl = 9899 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9900 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9901 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9902 // Ivar declared in @implementation never belongs to the implementation. 9903 // Only it is in implementation's lexical context. 9904 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9905 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9906 IMPDecl->setIvarLBraceLoc(LBrac); 9907 IMPDecl->setIvarRBraceLoc(RBrac); 9908 } else if (ObjCCategoryDecl *CDecl = 9909 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9910 // case of ivars in class extension; all other cases have been 9911 // reported as errors elsewhere. 9912 // FIXME. Class extension does not have a LocEnd field. 9913 // CDecl->setLocEnd(RBrac); 9914 // Add ivar's to class extension's DeclContext. 9915 // Diagnose redeclaration of private ivars. 9916 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9917 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9918 if (IDecl) { 9919 if (const ObjCIvarDecl *ClsIvar = 9920 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9921 Diag(ClsFields[i]->getLocation(), 9922 diag::err_duplicate_ivar_declaration); 9923 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9924 continue; 9925 } 9926 for (const ObjCCategoryDecl *ClsExtDecl = 9927 IDecl->getFirstClassExtension(); 9928 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9929 if (const ObjCIvarDecl *ClsExtIvar = 9930 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9931 Diag(ClsFields[i]->getLocation(), 9932 diag::err_duplicate_ivar_declaration); 9933 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9934 continue; 9935 } 9936 } 9937 } 9938 ClsFields[i]->setLexicalDeclContext(CDecl); 9939 CDecl->addDecl(ClsFields[i]); 9940 } 9941 CDecl->setIvarLBraceLoc(LBrac); 9942 CDecl->setIvarRBraceLoc(RBrac); 9943 } 9944 } 9945 9946 if (Attr) 9947 ProcessDeclAttributeList(S, Record, Attr); 9948 9949 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9950 // set the visibility of this record. 9951 if (Record && !Record->getDeclContext()->isRecord()) 9952 AddPushedVisibilityAttribute(Record); 9953} 9954 9955/// \brief Determine whether the given integral value is representable within 9956/// the given type T. 9957static bool isRepresentableIntegerValue(ASTContext &Context, 9958 llvm::APSInt &Value, 9959 QualType T) { 9960 assert(T->isIntegralType(Context) && "Integral type required!"); 9961 unsigned BitWidth = Context.getIntWidth(T); 9962 9963 if (Value.isUnsigned() || Value.isNonNegative()) { 9964 if (T->isSignedIntegerOrEnumerationType()) 9965 --BitWidth; 9966 return Value.getActiveBits() <= BitWidth; 9967 } 9968 return Value.getMinSignedBits() <= BitWidth; 9969} 9970 9971// \brief Given an integral type, return the next larger integral type 9972// (or a NULL type of no such type exists). 9973static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9974 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9975 // enum checking below. 9976 assert(T->isIntegralType(Context) && "Integral type required!"); 9977 const unsigned NumTypes = 4; 9978 QualType SignedIntegralTypes[NumTypes] = { 9979 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9980 }; 9981 QualType UnsignedIntegralTypes[NumTypes] = { 9982 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9983 Context.UnsignedLongLongTy 9984 }; 9985 9986 unsigned BitWidth = Context.getTypeSize(T); 9987 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9988 : UnsignedIntegralTypes; 9989 for (unsigned I = 0; I != NumTypes; ++I) 9990 if (Context.getTypeSize(Types[I]) > BitWidth) 9991 return Types[I]; 9992 9993 return QualType(); 9994} 9995 9996EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9997 EnumConstantDecl *LastEnumConst, 9998 SourceLocation IdLoc, 9999 IdentifierInfo *Id, 10000 Expr *Val) { 10001 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10002 llvm::APSInt EnumVal(IntWidth); 10003 QualType EltTy; 10004 10005 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 10006 Val = 0; 10007 10008 if (Val) 10009 Val = DefaultLvalueConversion(Val).take(); 10010 10011 if (Val) { 10012 if (Enum->isDependentType() || Val->isTypeDependent()) 10013 EltTy = Context.DependentTy; 10014 else { 10015 SourceLocation ExpLoc; 10016 if (getLangOpts().CPlusPlus0x && Enum->isFixed() && 10017 !getLangOpts().MicrosoftMode) { 10018 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 10019 // constant-expression in the enumerator-definition shall be a converted 10020 // constant expression of the underlying type. 10021 EltTy = Enum->getIntegerType(); 10022 ExprResult Converted = 10023 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 10024 CCEK_Enumerator); 10025 if (Converted.isInvalid()) 10026 Val = 0; 10027 else 10028 Val = Converted.take(); 10029 } else if (!Val->isValueDependent() && 10030 !(Val = VerifyIntegerConstantExpression(Val, 10031 &EnumVal).take())) { 10032 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 10033 } else { 10034 if (Enum->isFixed()) { 10035 EltTy = Enum->getIntegerType(); 10036 10037 // In Obj-C and Microsoft mode, require the enumeration value to be 10038 // representable in the underlying type of the enumeration. In C++11, 10039 // we perform a non-narrowing conversion as part of converted constant 10040 // expression checking. 10041 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10042 if (getLangOpts().MicrosoftMode) { 10043 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 10044 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10045 } else 10046 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 10047 } else 10048 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10049 } else if (getLangOpts().CPlusPlus) { 10050 // C++11 [dcl.enum]p5: 10051 // If the underlying type is not fixed, the type of each enumerator 10052 // is the type of its initializing value: 10053 // - If an initializer is specified for an enumerator, the 10054 // initializing value has the same type as the expression. 10055 EltTy = Val->getType(); 10056 } else { 10057 // C99 6.7.2.2p2: 10058 // The expression that defines the value of an enumeration constant 10059 // shall be an integer constant expression that has a value 10060 // representable as an int. 10061 10062 // Complain if the value is not representable in an int. 10063 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 10064 Diag(IdLoc, diag::ext_enum_value_not_int) 10065 << EnumVal.toString(10) << Val->getSourceRange() 10066 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 10067 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 10068 // Force the type of the expression to 'int'. 10069 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 10070 } 10071 EltTy = Val->getType(); 10072 } 10073 } 10074 } 10075 } 10076 10077 if (!Val) { 10078 if (Enum->isDependentType()) 10079 EltTy = Context.DependentTy; 10080 else if (!LastEnumConst) { 10081 // C++0x [dcl.enum]p5: 10082 // If the underlying type is not fixed, the type of each enumerator 10083 // is the type of its initializing value: 10084 // - If no initializer is specified for the first enumerator, the 10085 // initializing value has an unspecified integral type. 10086 // 10087 // GCC uses 'int' for its unspecified integral type, as does 10088 // C99 6.7.2.2p3. 10089 if (Enum->isFixed()) { 10090 EltTy = Enum->getIntegerType(); 10091 } 10092 else { 10093 EltTy = Context.IntTy; 10094 } 10095 } else { 10096 // Assign the last value + 1. 10097 EnumVal = LastEnumConst->getInitVal(); 10098 ++EnumVal; 10099 EltTy = LastEnumConst->getType(); 10100 10101 // Check for overflow on increment. 10102 if (EnumVal < LastEnumConst->getInitVal()) { 10103 // C++0x [dcl.enum]p5: 10104 // If the underlying type is not fixed, the type of each enumerator 10105 // is the type of its initializing value: 10106 // 10107 // - Otherwise the type of the initializing value is the same as 10108 // the type of the initializing value of the preceding enumerator 10109 // unless the incremented value is not representable in that type, 10110 // in which case the type is an unspecified integral type 10111 // sufficient to contain the incremented value. If no such type 10112 // exists, the program is ill-formed. 10113 QualType T = getNextLargerIntegralType(Context, EltTy); 10114 if (T.isNull() || Enum->isFixed()) { 10115 // There is no integral type larger enough to represent this 10116 // value. Complain, then allow the value to wrap around. 10117 EnumVal = LastEnumConst->getInitVal(); 10118 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 10119 ++EnumVal; 10120 if (Enum->isFixed()) 10121 // When the underlying type is fixed, this is ill-formed. 10122 Diag(IdLoc, diag::err_enumerator_wrapped) 10123 << EnumVal.toString(10) 10124 << EltTy; 10125 else 10126 Diag(IdLoc, diag::warn_enumerator_too_large) 10127 << EnumVal.toString(10); 10128 } else { 10129 EltTy = T; 10130 } 10131 10132 // Retrieve the last enumerator's value, extent that type to the 10133 // type that is supposed to be large enough to represent the incremented 10134 // value, then increment. 10135 EnumVal = LastEnumConst->getInitVal(); 10136 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10137 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 10138 ++EnumVal; 10139 10140 // If we're not in C++, diagnose the overflow of enumerator values, 10141 // which in C99 means that the enumerator value is not representable in 10142 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 10143 // permits enumerator values that are representable in some larger 10144 // integral type. 10145 if (!getLangOpts().CPlusPlus && !T.isNull()) 10146 Diag(IdLoc, diag::warn_enum_value_overflow); 10147 } else if (!getLangOpts().CPlusPlus && 10148 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10149 // Enforce C99 6.7.2.2p2 even when we compute the next value. 10150 Diag(IdLoc, diag::ext_enum_value_not_int) 10151 << EnumVal.toString(10) << 1; 10152 } 10153 } 10154 } 10155 10156 if (!EltTy->isDependentType()) { 10157 // Make the enumerator value match the signedness and size of the 10158 // enumerator's type. 10159 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); 10160 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10161 } 10162 10163 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 10164 Val, EnumVal); 10165} 10166 10167 10168Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 10169 SourceLocation IdLoc, IdentifierInfo *Id, 10170 AttributeList *Attr, 10171 SourceLocation EqualLoc, Expr *Val) { 10172 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 10173 EnumConstantDecl *LastEnumConst = 10174 cast_or_null<EnumConstantDecl>(lastEnumConst); 10175 10176 // The scope passed in may not be a decl scope. Zip up the scope tree until 10177 // we find one that is. 10178 S = getNonFieldDeclScope(S); 10179 10180 // Verify that there isn't already something declared with this name in this 10181 // scope. 10182 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 10183 ForRedeclaration); 10184 if (PrevDecl && PrevDecl->isTemplateParameter()) { 10185 // Maybe we will complain about the shadowed template parameter. 10186 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 10187 // Just pretend that we didn't see the previous declaration. 10188 PrevDecl = 0; 10189 } 10190 10191 if (PrevDecl) { 10192 // When in C++, we may get a TagDecl with the same name; in this case the 10193 // enum constant will 'hide' the tag. 10194 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 10195 "Received TagDecl when not in C++!"); 10196 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 10197 if (isa<EnumConstantDecl>(PrevDecl)) 10198 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 10199 else 10200 Diag(IdLoc, diag::err_redefinition) << Id; 10201 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 10202 return 0; 10203 } 10204 } 10205 10206 // C++ [class.mem]p13: 10207 // If T is the name of a class, then each of the following shall have a 10208 // name different from T: 10209 // - every enumerator of every member of class T that is an enumerated 10210 // type 10211 if (CXXRecordDecl *Record 10212 = dyn_cast<CXXRecordDecl>( 10213 TheEnumDecl->getDeclContext()->getRedeclContext())) 10214 if (Record->getIdentifier() && Record->getIdentifier() == Id) 10215 Diag(IdLoc, diag::err_member_name_of_class) << Id; 10216 10217 EnumConstantDecl *New = 10218 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 10219 10220 if (New) { 10221 // Process attributes. 10222 if (Attr) ProcessDeclAttributeList(S, New, Attr); 10223 10224 // Register this decl in the current scope stack. 10225 New->setAccess(TheEnumDecl->getAccess()); 10226 PushOnScopeChains(New, S); 10227 } 10228 10229 return New; 10230} 10231 10232void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 10233 SourceLocation RBraceLoc, Decl *EnumDeclX, 10234 Decl **Elements, unsigned NumElements, 10235 Scope *S, AttributeList *Attr) { 10236 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 10237 QualType EnumType = Context.getTypeDeclType(Enum); 10238 10239 if (Attr) 10240 ProcessDeclAttributeList(S, Enum, Attr); 10241 10242 if (Enum->isDependentType()) { 10243 for (unsigned i = 0; i != NumElements; ++i) { 10244 EnumConstantDecl *ECD = 10245 cast_or_null<EnumConstantDecl>(Elements[i]); 10246 if (!ECD) continue; 10247 10248 ECD->setType(EnumType); 10249 } 10250 10251 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 10252 return; 10253 } 10254 10255 // TODO: If the result value doesn't fit in an int, it must be a long or long 10256 // long value. ISO C does not support this, but GCC does as an extension, 10257 // emit a warning. 10258 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10259 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 10260 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 10261 10262 // Verify that all the values are okay, compute the size of the values, and 10263 // reverse the list. 10264 unsigned NumNegativeBits = 0; 10265 unsigned NumPositiveBits = 0; 10266 10267 // Keep track of whether all elements have type int. 10268 bool AllElementsInt = true; 10269 10270 for (unsigned i = 0; i != NumElements; ++i) { 10271 EnumConstantDecl *ECD = 10272 cast_or_null<EnumConstantDecl>(Elements[i]); 10273 if (!ECD) continue; // Already issued a diagnostic. 10274 10275 const llvm::APSInt &InitVal = ECD->getInitVal(); 10276 10277 // Keep track of the size of positive and negative values. 10278 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 10279 NumPositiveBits = std::max(NumPositiveBits, 10280 (unsigned)InitVal.getActiveBits()); 10281 else 10282 NumNegativeBits = std::max(NumNegativeBits, 10283 (unsigned)InitVal.getMinSignedBits()); 10284 10285 // Keep track of whether every enum element has type int (very commmon). 10286 if (AllElementsInt) 10287 AllElementsInt = ECD->getType() == Context.IntTy; 10288 } 10289 10290 // Figure out the type that should be used for this enum. 10291 QualType BestType; 10292 unsigned BestWidth; 10293 10294 // C++0x N3000 [conv.prom]p3: 10295 // An rvalue of an unscoped enumeration type whose underlying 10296 // type is not fixed can be converted to an rvalue of the first 10297 // of the following types that can represent all the values of 10298 // the enumeration: int, unsigned int, long int, unsigned long 10299 // int, long long int, or unsigned long long int. 10300 // C99 6.4.4.3p2: 10301 // An identifier declared as an enumeration constant has type int. 10302 // The C99 rule is modified by a gcc extension 10303 QualType BestPromotionType; 10304 10305 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 10306 // -fshort-enums is the equivalent to specifying the packed attribute on all 10307 // enum definitions. 10308 if (LangOpts.ShortEnums) 10309 Packed = true; 10310 10311 if (Enum->isFixed()) { 10312 BestType = Enum->getIntegerType(); 10313 if (BestType->isPromotableIntegerType()) 10314 BestPromotionType = Context.getPromotedIntegerType(BestType); 10315 else 10316 BestPromotionType = BestType; 10317 // We don't need to set BestWidth, because BestType is going to be the type 10318 // of the enumerators, but we do anyway because otherwise some compilers 10319 // warn that it might be used uninitialized. 10320 BestWidth = CharWidth; 10321 } 10322 else if (NumNegativeBits) { 10323 // If there is a negative value, figure out the smallest integer type (of 10324 // int/long/longlong) that fits. 10325 // If it's packed, check also if it fits a char or a short. 10326 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 10327 BestType = Context.SignedCharTy; 10328 BestWidth = CharWidth; 10329 } else if (Packed && NumNegativeBits <= ShortWidth && 10330 NumPositiveBits < ShortWidth) { 10331 BestType = Context.ShortTy; 10332 BestWidth = ShortWidth; 10333 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 10334 BestType = Context.IntTy; 10335 BestWidth = IntWidth; 10336 } else { 10337 BestWidth = Context.getTargetInfo().getLongWidth(); 10338 10339 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 10340 BestType = Context.LongTy; 10341 } else { 10342 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10343 10344 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 10345 Diag(Enum->getLocation(), diag::warn_enum_too_large); 10346 BestType = Context.LongLongTy; 10347 } 10348 } 10349 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 10350 } else { 10351 // If there is no negative value, figure out the smallest type that fits 10352 // all of the enumerator values. 10353 // If it's packed, check also if it fits a char or a short. 10354 if (Packed && NumPositiveBits <= CharWidth) { 10355 BestType = Context.UnsignedCharTy; 10356 BestPromotionType = Context.IntTy; 10357 BestWidth = CharWidth; 10358 } else if (Packed && NumPositiveBits <= ShortWidth) { 10359 BestType = Context.UnsignedShortTy; 10360 BestPromotionType = Context.IntTy; 10361 BestWidth = ShortWidth; 10362 } else if (NumPositiveBits <= IntWidth) { 10363 BestType = Context.UnsignedIntTy; 10364 BestWidth = IntWidth; 10365 BestPromotionType 10366 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10367 ? Context.UnsignedIntTy : Context.IntTy; 10368 } else if (NumPositiveBits <= 10369 (BestWidth = Context.getTargetInfo().getLongWidth())) { 10370 BestType = Context.UnsignedLongTy; 10371 BestPromotionType 10372 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10373 ? Context.UnsignedLongTy : Context.LongTy; 10374 } else { 10375 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10376 assert(NumPositiveBits <= BestWidth && 10377 "How could an initializer get larger than ULL?"); 10378 BestType = Context.UnsignedLongLongTy; 10379 BestPromotionType 10380 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10381 ? Context.UnsignedLongLongTy : Context.LongLongTy; 10382 } 10383 } 10384 10385 // Loop over all of the enumerator constants, changing their types to match 10386 // the type of the enum if needed. 10387 for (unsigned i = 0; i != NumElements; ++i) { 10388 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10389 if (!ECD) continue; // Already issued a diagnostic. 10390 10391 // Standard C says the enumerators have int type, but we allow, as an 10392 // extension, the enumerators to be larger than int size. If each 10393 // enumerator value fits in an int, type it as an int, otherwise type it the 10394 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 10395 // that X has type 'int', not 'unsigned'. 10396 10397 // Determine whether the value fits into an int. 10398 llvm::APSInt InitVal = ECD->getInitVal(); 10399 10400 // If it fits into an integer type, force it. Otherwise force it to match 10401 // the enum decl type. 10402 QualType NewTy; 10403 unsigned NewWidth; 10404 bool NewSign; 10405 if (!getLangOpts().CPlusPlus && 10406 !Enum->isFixed() && 10407 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 10408 NewTy = Context.IntTy; 10409 NewWidth = IntWidth; 10410 NewSign = true; 10411 } else if (ECD->getType() == BestType) { 10412 // Already the right type! 10413 if (getLangOpts().CPlusPlus) 10414 // C++ [dcl.enum]p4: Following the closing brace of an 10415 // enum-specifier, each enumerator has the type of its 10416 // enumeration. 10417 ECD->setType(EnumType); 10418 continue; 10419 } else { 10420 NewTy = BestType; 10421 NewWidth = BestWidth; 10422 NewSign = BestType->isSignedIntegerOrEnumerationType(); 10423 } 10424 10425 // Adjust the APSInt value. 10426 InitVal = InitVal.extOrTrunc(NewWidth); 10427 InitVal.setIsSigned(NewSign); 10428 ECD->setInitVal(InitVal); 10429 10430 // Adjust the Expr initializer and type. 10431 if (ECD->getInitExpr() && 10432 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10433 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10434 CK_IntegralCast, 10435 ECD->getInitExpr(), 10436 /*base paths*/ 0, 10437 VK_RValue)); 10438 if (getLangOpts().CPlusPlus) 10439 // C++ [dcl.enum]p4: Following the closing brace of an 10440 // enum-specifier, each enumerator has the type of its 10441 // enumeration. 10442 ECD->setType(EnumType); 10443 else 10444 ECD->setType(NewTy); 10445 } 10446 10447 Enum->completeDefinition(BestType, BestPromotionType, 10448 NumPositiveBits, NumNegativeBits); 10449 10450 // If we're declaring a function, ensure this decl isn't forgotten about - 10451 // it needs to go into the function scope. 10452 if (InFunctionDeclarator) 10453 DeclsInPrototypeScope.push_back(Enum); 10454 10455} 10456 10457Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10458 SourceLocation StartLoc, 10459 SourceLocation EndLoc) { 10460 StringLiteral *AsmString = cast<StringLiteral>(expr); 10461 10462 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10463 AsmString, StartLoc, 10464 EndLoc); 10465 CurContext->addDecl(New); 10466 return New; 10467} 10468 10469DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10470 SourceLocation ImportLoc, 10471 ModuleIdPath Path) { 10472 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10473 Module::AllVisible, 10474 /*IsIncludeDirective=*/false); 10475 if (!Mod) 10476 return true; 10477 10478 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10479 Module *ModCheck = Mod; 10480 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10481 // If we've run out of module parents, just drop the remaining identifiers. 10482 // We need the length to be consistent. 10483 if (!ModCheck) 10484 break; 10485 ModCheck = ModCheck->Parent; 10486 10487 IdentifierLocs.push_back(Path[I].second); 10488 } 10489 10490 ImportDecl *Import = ImportDecl::Create(Context, 10491 Context.getTranslationUnitDecl(), 10492 AtLoc.isValid()? AtLoc : ImportLoc, 10493 Mod, IdentifierLocs); 10494 Context.getTranslationUnitDecl()->addDecl(Import); 10495 return Import; 10496} 10497 10498void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name, 10499 IdentifierInfo* AliasName, 10500 SourceLocation PragmaLoc, 10501 SourceLocation NameLoc, 10502 SourceLocation AliasNameLoc) { 10503 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, 10504 LookupOrdinaryName); 10505 AsmLabelAttr *Attr = 10506 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName()); 10507 10508 if (PrevDecl) 10509 PrevDecl->addAttr(Attr); 10510 else 10511 (void)ExtnameUndeclaredIdentifiers.insert( 10512 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr)); 10513} 10514 10515void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10516 SourceLocation PragmaLoc, 10517 SourceLocation NameLoc) { 10518 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10519 10520 if (PrevDecl) { 10521 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10522 } else { 10523 (void)WeakUndeclaredIdentifiers.insert( 10524 std::pair<IdentifierInfo*,WeakInfo> 10525 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10526 } 10527} 10528 10529void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10530 IdentifierInfo* AliasName, 10531 SourceLocation PragmaLoc, 10532 SourceLocation NameLoc, 10533 SourceLocation AliasNameLoc) { 10534 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10535 LookupOrdinaryName); 10536 WeakInfo W = WeakInfo(Name, NameLoc); 10537 10538 if (PrevDecl) { 10539 if (!PrevDecl->hasAttr<AliasAttr>()) 10540 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10541 DeclApplyPragmaWeak(TUScope, ND, W); 10542 } else { 10543 (void)WeakUndeclaredIdentifiers.insert( 10544 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10545 } 10546} 10547 10548Decl *Sema::getObjCDeclContext() const { 10549 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10550} 10551 10552AvailabilityResult Sema::getCurContextAvailability() const { 10553 const Decl *D = cast<Decl>(getCurLexicalContext()); 10554 // A category implicitly has the availability of the interface. 10555 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10556 D = CatD->getClassInterface(); 10557 10558 return D->getAvailability(); 10559} 10560