SemaDecl.cpp revision 599f1b7100745efacb7ded6c176cb7feade114a5
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 if (!TypeID->isStr("id")) 1522 break; 1523 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1524 // Install the built-in type for 'id', ignoring the current definition. 1525 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1526 return; 1527 case 5: 1528 if (!TypeID->isStr("Class")) 1529 break; 1530 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1531 // Install the built-in type for 'Class', ignoring the current definition. 1532 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1533 return; 1534 case 3: 1535 if (!TypeID->isStr("SEL")) 1536 break; 1537 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1538 // Install the built-in type for 'SEL', ignoring the current definition. 1539 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1540 return; 1541 } 1542 // Fall through - the typedef name was not a builtin type. 1543 } 1544 1545 // Verify the old decl was also a type. 1546 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1547 if (!Old) { 1548 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1549 << New->getDeclName(); 1550 1551 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1552 if (OldD->getLocation().isValid()) 1553 Diag(OldD->getLocation(), diag::note_previous_definition); 1554 1555 return New->setInvalidDecl(); 1556 } 1557 1558 // If the old declaration is invalid, just give up here. 1559 if (Old->isInvalidDecl()) 1560 return New->setInvalidDecl(); 1561 1562 // If the typedef types are not identical, reject them in all languages and 1563 // with any extensions enabled. 1564 if (isIncompatibleTypedef(Old, New)) 1565 return; 1566 1567 // The types match. Link up the redeclaration chain if the old 1568 // declaration was a typedef. 1569 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1570 New->setPreviousDeclaration(Typedef); 1571 1572 if (getLangOpts().MicrosoftExt) 1573 return; 1574 1575 if (getLangOpts().CPlusPlus) { 1576 // C++ [dcl.typedef]p2: 1577 // In a given non-class scope, a typedef specifier can be used to 1578 // redefine the name of any type declared in that scope to refer 1579 // to the type to which it already refers. 1580 if (!isa<CXXRecordDecl>(CurContext)) 1581 return; 1582 1583 // C++0x [dcl.typedef]p4: 1584 // In a given class scope, a typedef specifier can be used to redefine 1585 // any class-name declared in that scope that is not also a typedef-name 1586 // to refer to the type to which it already refers. 1587 // 1588 // This wording came in via DR424, which was a correction to the 1589 // wording in DR56, which accidentally banned code like: 1590 // 1591 // struct S { 1592 // typedef struct A { } A; 1593 // }; 1594 // 1595 // in the C++03 standard. We implement the C++0x semantics, which 1596 // allow the above but disallow 1597 // 1598 // struct S { 1599 // typedef int I; 1600 // typedef int I; 1601 // }; 1602 // 1603 // since that was the intent of DR56. 1604 if (!isa<TypedefNameDecl>(Old)) 1605 return; 1606 1607 Diag(New->getLocation(), diag::err_redefinition) 1608 << New->getDeclName(); 1609 Diag(Old->getLocation(), diag::note_previous_definition); 1610 return New->setInvalidDecl(); 1611 } 1612 1613 // Modules always permit redefinition of typedefs, as does C11. 1614 if (getLangOpts().Modules || getLangOpts().C11) 1615 return; 1616 1617 // If we have a redefinition of a typedef in C, emit a warning. This warning 1618 // is normally mapped to an error, but can be controlled with 1619 // -Wtypedef-redefinition. If either the original or the redefinition is 1620 // in a system header, don't emit this for compatibility with GCC. 1621 if (getDiagnostics().getSuppressSystemWarnings() && 1622 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1623 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1624 return; 1625 1626 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1627 << New->getDeclName(); 1628 Diag(Old->getLocation(), diag::note_previous_definition); 1629 return; 1630} 1631 1632/// DeclhasAttr - returns true if decl Declaration already has the target 1633/// attribute. 1634static bool 1635DeclHasAttr(const Decl *D, const Attr *A) { 1636 // There can be multiple AvailabilityAttr in a Decl. Make sure we copy 1637 // all of them. It is mergeAvailabilityAttr in SemaDeclAttr.cpp that is 1638 // responsible for making sure they are consistent. 1639 const AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(A); 1640 if (AA) 1641 return false; 1642 1643 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1644 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1645 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1646 if ((*i)->getKind() == A->getKind()) { 1647 if (Ann) { 1648 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1649 return true; 1650 continue; 1651 } 1652 // FIXME: Don't hardcode this check 1653 if (OA && isa<OwnershipAttr>(*i)) 1654 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1655 return true; 1656 } 1657 1658 return false; 1659} 1660 1661bool Sema::mergeDeclAttribute(Decl *D, InheritableAttr *Attr) { 1662 InheritableAttr *NewAttr = NULL; 1663 if (AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(Attr)) 1664 NewAttr = mergeAvailabilityAttr(D, AA->getRange(), AA->getPlatform(), 1665 AA->getIntroduced(), AA->getDeprecated(), 1666 AA->getObsoleted(), AA->getUnavailable(), 1667 AA->getMessage()); 1668 else if (VisibilityAttr *VA = dyn_cast<VisibilityAttr>(Attr)) 1669 NewAttr = mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility()); 1670 else if (DLLImportAttr *ImportA = dyn_cast<DLLImportAttr>(Attr)) 1671 NewAttr = mergeDLLImportAttr(D, ImportA->getRange()); 1672 else if (DLLExportAttr *ExportA = dyn_cast<DLLExportAttr>(Attr)) 1673 NewAttr = mergeDLLExportAttr(D, ExportA->getRange()); 1674 else if (FormatAttr *FA = dyn_cast<FormatAttr>(Attr)) 1675 NewAttr = mergeFormatAttr(D, FA->getRange(), FA->getType(), 1676 FA->getFormatIdx(), FA->getFirstArg()); 1677 else if (SectionAttr *SA = dyn_cast<SectionAttr>(Attr)) 1678 NewAttr = mergeSectionAttr(D, SA->getRange(), SA->getName()); 1679 else if (!DeclHasAttr(D, Attr)) 1680 NewAttr = cast<InheritableAttr>(Attr->clone(Context)); 1681 1682 if (NewAttr) { 1683 NewAttr->setInherited(true); 1684 D->addAttr(NewAttr); 1685 return true; 1686 } 1687 1688 return false; 1689} 1690 1691/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1692void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1693 bool MergeDeprecation) { 1694 if (!Old->hasAttrs()) 1695 return; 1696 1697 bool foundAny = New->hasAttrs(); 1698 1699 // Ensure that any moving of objects within the allocated map is done before 1700 // we process them. 1701 if (!foundAny) New->setAttrs(AttrVec()); 1702 1703 for (specific_attr_iterator<InheritableAttr> 1704 i = Old->specific_attr_begin<InheritableAttr>(), 1705 e = Old->specific_attr_end<InheritableAttr>(); 1706 i != e; ++i) { 1707 // Ignore deprecated/unavailable/availability attributes if requested. 1708 if (!MergeDeprecation && 1709 (isa<DeprecatedAttr>(*i) || 1710 isa<UnavailableAttr>(*i) || 1711 isa<AvailabilityAttr>(*i))) 1712 continue; 1713 1714 if (mergeDeclAttribute(New, *i)) 1715 foundAny = true; 1716 } 1717 1718 if (!foundAny) New->dropAttrs(); 1719} 1720 1721/// mergeParamDeclAttributes - Copy attributes from the old parameter 1722/// to the new one. 1723static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1724 const ParmVarDecl *oldDecl, 1725 ASTContext &C) { 1726 if (!oldDecl->hasAttrs()) 1727 return; 1728 1729 bool foundAny = newDecl->hasAttrs(); 1730 1731 // Ensure that any moving of objects within the allocated map is 1732 // done before we process them. 1733 if (!foundAny) newDecl->setAttrs(AttrVec()); 1734 1735 for (specific_attr_iterator<InheritableParamAttr> 1736 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1737 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1738 if (!DeclHasAttr(newDecl, *i)) { 1739 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1740 newAttr->setInherited(true); 1741 newDecl->addAttr(newAttr); 1742 foundAny = true; 1743 } 1744 } 1745 1746 if (!foundAny) newDecl->dropAttrs(); 1747} 1748 1749namespace { 1750 1751/// Used in MergeFunctionDecl to keep track of function parameters in 1752/// C. 1753struct GNUCompatibleParamWarning { 1754 ParmVarDecl *OldParm; 1755 ParmVarDecl *NewParm; 1756 QualType PromotedType; 1757}; 1758 1759} 1760 1761/// getSpecialMember - get the special member enum for a method. 1762Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1763 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1764 if (Ctor->isDefaultConstructor()) 1765 return Sema::CXXDefaultConstructor; 1766 1767 if (Ctor->isCopyConstructor()) 1768 return Sema::CXXCopyConstructor; 1769 1770 if (Ctor->isMoveConstructor()) 1771 return Sema::CXXMoveConstructor; 1772 } else if (isa<CXXDestructorDecl>(MD)) { 1773 return Sema::CXXDestructor; 1774 } else if (MD->isCopyAssignmentOperator()) { 1775 return Sema::CXXCopyAssignment; 1776 } else if (MD->isMoveAssignmentOperator()) { 1777 return Sema::CXXMoveAssignment; 1778 } 1779 1780 return Sema::CXXInvalid; 1781} 1782 1783/// canRedefineFunction - checks if a function can be redefined. Currently, 1784/// only extern inline functions can be redefined, and even then only in 1785/// GNU89 mode. 1786static bool canRedefineFunction(const FunctionDecl *FD, 1787 const LangOptions& LangOpts) { 1788 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1789 !LangOpts.CPlusPlus && 1790 FD->isInlineSpecified() && 1791 FD->getStorageClass() == SC_Extern); 1792} 1793 1794/// MergeFunctionDecl - We just parsed a function 'New' from 1795/// declarator D which has the same name and scope as a previous 1796/// declaration 'Old'. Figure out how to resolve this situation, 1797/// merging decls or emitting diagnostics as appropriate. 1798/// 1799/// In C++, New and Old must be declarations that are not 1800/// overloaded. Use IsOverload to determine whether New and Old are 1801/// overloaded, and to select the Old declaration that New should be 1802/// merged with. 1803/// 1804/// Returns true if there was an error, false otherwise. 1805bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) { 1806 // Verify the old decl was also a function. 1807 FunctionDecl *Old = 0; 1808 if (FunctionTemplateDecl *OldFunctionTemplate 1809 = dyn_cast<FunctionTemplateDecl>(OldD)) 1810 Old = OldFunctionTemplate->getTemplatedDecl(); 1811 else 1812 Old = dyn_cast<FunctionDecl>(OldD); 1813 if (!Old) { 1814 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1815 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1816 Diag(Shadow->getTargetDecl()->getLocation(), 1817 diag::note_using_decl_target); 1818 Diag(Shadow->getUsingDecl()->getLocation(), 1819 diag::note_using_decl) << 0; 1820 return true; 1821 } 1822 1823 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1824 << New->getDeclName(); 1825 Diag(OldD->getLocation(), diag::note_previous_definition); 1826 return true; 1827 } 1828 1829 // Determine whether the previous declaration was a definition, 1830 // implicit declaration, or a declaration. 1831 diag::kind PrevDiag; 1832 if (Old->isThisDeclarationADefinition()) 1833 PrevDiag = diag::note_previous_definition; 1834 else if (Old->isImplicit()) 1835 PrevDiag = diag::note_previous_implicit_declaration; 1836 else 1837 PrevDiag = diag::note_previous_declaration; 1838 1839 QualType OldQType = Context.getCanonicalType(Old->getType()); 1840 QualType NewQType = Context.getCanonicalType(New->getType()); 1841 1842 // Don't complain about this if we're in GNU89 mode and the old function 1843 // is an extern inline function. 1844 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1845 New->getStorageClass() == SC_Static && 1846 Old->getStorageClass() != SC_Static && 1847 !canRedefineFunction(Old, getLangOpts())) { 1848 if (getLangOpts().MicrosoftExt) { 1849 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1850 Diag(Old->getLocation(), PrevDiag); 1851 } else { 1852 Diag(New->getLocation(), diag::err_static_non_static) << New; 1853 Diag(Old->getLocation(), PrevDiag); 1854 return true; 1855 } 1856 } 1857 1858 // If a function is first declared with a calling convention, but is 1859 // later declared or defined without one, the second decl assumes the 1860 // calling convention of the first. 1861 // 1862 // For the new decl, we have to look at the NON-canonical type to tell the 1863 // difference between a function that really doesn't have a calling 1864 // convention and one that is declared cdecl. That's because in 1865 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1866 // because it is the default calling convention. 1867 // 1868 // Note also that we DO NOT return at this point, because we still have 1869 // other tests to run. 1870 const FunctionType *OldType = cast<FunctionType>(OldQType); 1871 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1872 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1873 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1874 bool RequiresAdjustment = false; 1875 if (OldTypeInfo.getCC() != CC_Default && 1876 NewTypeInfo.getCC() == CC_Default) { 1877 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1878 RequiresAdjustment = true; 1879 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1880 NewTypeInfo.getCC())) { 1881 // Calling conventions really aren't compatible, so complain. 1882 Diag(New->getLocation(), diag::err_cconv_change) 1883 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1884 << (OldTypeInfo.getCC() == CC_Default) 1885 << (OldTypeInfo.getCC() == CC_Default ? "" : 1886 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1887 Diag(Old->getLocation(), diag::note_previous_declaration); 1888 return true; 1889 } 1890 1891 // FIXME: diagnose the other way around? 1892 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1893 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1894 RequiresAdjustment = true; 1895 } 1896 1897 // Merge regparm attribute. 1898 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1899 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1900 if (NewTypeInfo.getHasRegParm()) { 1901 Diag(New->getLocation(), diag::err_regparm_mismatch) 1902 << NewType->getRegParmType() 1903 << OldType->getRegParmType(); 1904 Diag(Old->getLocation(), diag::note_previous_declaration); 1905 return true; 1906 } 1907 1908 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1909 RequiresAdjustment = true; 1910 } 1911 1912 // Merge ns_returns_retained attribute. 1913 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1914 if (NewTypeInfo.getProducesResult()) { 1915 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1916 Diag(Old->getLocation(), diag::note_previous_declaration); 1917 return true; 1918 } 1919 1920 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1921 RequiresAdjustment = true; 1922 } 1923 1924 if (RequiresAdjustment) { 1925 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1926 New->setType(QualType(NewType, 0)); 1927 NewQType = Context.getCanonicalType(New->getType()); 1928 } 1929 1930 if (getLangOpts().CPlusPlus) { 1931 // (C++98 13.1p2): 1932 // Certain function declarations cannot be overloaded: 1933 // -- Function declarations that differ only in the return type 1934 // cannot be overloaded. 1935 QualType OldReturnType = OldType->getResultType(); 1936 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1937 QualType ResQT; 1938 if (OldReturnType != NewReturnType) { 1939 if (NewReturnType->isObjCObjectPointerType() 1940 && OldReturnType->isObjCObjectPointerType()) 1941 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1942 if (ResQT.isNull()) { 1943 if (New->isCXXClassMember() && New->isOutOfLine()) 1944 Diag(New->getLocation(), 1945 diag::err_member_def_does_not_match_ret_type) << New; 1946 else 1947 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1948 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1949 return true; 1950 } 1951 else 1952 NewQType = ResQT; 1953 } 1954 1955 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1956 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1957 if (OldMethod && NewMethod) { 1958 // Preserve triviality. 1959 NewMethod->setTrivial(OldMethod->isTrivial()); 1960 1961 // MSVC allows explicit template specialization at class scope: 1962 // 2 CXMethodDecls referring to the same function will be injected. 1963 // We don't want a redeclartion error. 1964 bool IsClassScopeExplicitSpecialization = 1965 OldMethod->isFunctionTemplateSpecialization() && 1966 NewMethod->isFunctionTemplateSpecialization(); 1967 bool isFriend = NewMethod->getFriendObjectKind(); 1968 1969 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1970 !IsClassScopeExplicitSpecialization) { 1971 // -- Member function declarations with the same name and the 1972 // same parameter types cannot be overloaded if any of them 1973 // is a static member function declaration. 1974 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1975 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1976 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1977 return true; 1978 } 1979 1980 // C++ [class.mem]p1: 1981 // [...] A member shall not be declared twice in the 1982 // member-specification, except that a nested class or member 1983 // class template can be declared and then later defined. 1984 unsigned NewDiag; 1985 if (isa<CXXConstructorDecl>(OldMethod)) 1986 NewDiag = diag::err_constructor_redeclared; 1987 else if (isa<CXXDestructorDecl>(NewMethod)) 1988 NewDiag = diag::err_destructor_redeclared; 1989 else if (isa<CXXConversionDecl>(NewMethod)) 1990 NewDiag = diag::err_conv_function_redeclared; 1991 else 1992 NewDiag = diag::err_member_redeclared; 1993 1994 Diag(New->getLocation(), NewDiag); 1995 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1996 1997 // Complain if this is an explicit declaration of a special 1998 // member that was initially declared implicitly. 1999 // 2000 // As an exception, it's okay to befriend such methods in order 2001 // to permit the implicit constructor/destructor/operator calls. 2002 } else if (OldMethod->isImplicit()) { 2003 if (isFriend) { 2004 NewMethod->setImplicit(); 2005 } else { 2006 Diag(NewMethod->getLocation(), 2007 diag::err_definition_of_implicitly_declared_member) 2008 << New << getSpecialMember(OldMethod); 2009 return true; 2010 } 2011 } else if (OldMethod->isExplicitlyDefaulted()) { 2012 Diag(NewMethod->getLocation(), 2013 diag::err_definition_of_explicitly_defaulted_member) 2014 << getSpecialMember(OldMethod); 2015 return true; 2016 } 2017 } 2018 2019 // (C++98 8.3.5p3): 2020 // All declarations for a function shall agree exactly in both the 2021 // return type and the parameter-type-list. 2022 // We also want to respect all the extended bits except noreturn. 2023 2024 // noreturn should now match unless the old type info didn't have it. 2025 QualType OldQTypeForComparison = OldQType; 2026 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 2027 assert(OldQType == QualType(OldType, 0)); 2028 const FunctionType *OldTypeForComparison 2029 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 2030 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 2031 assert(OldQTypeForComparison.isCanonical()); 2032 } 2033 2034 if (OldQTypeForComparison == NewQType) 2035 return MergeCompatibleFunctionDecls(New, Old, S); 2036 2037 // Fall through for conflicting redeclarations and redefinitions. 2038 } 2039 2040 // C: Function types need to be compatible, not identical. This handles 2041 // duplicate function decls like "void f(int); void f(enum X);" properly. 2042 if (!getLangOpts().CPlusPlus && 2043 Context.typesAreCompatible(OldQType, NewQType)) { 2044 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 2045 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 2046 const FunctionProtoType *OldProto = 0; 2047 if (isa<FunctionNoProtoType>(NewFuncType) && 2048 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 2049 // The old declaration provided a function prototype, but the 2050 // new declaration does not. Merge in the prototype. 2051 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 2052 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 2053 OldProto->arg_type_end()); 2054 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 2055 ParamTypes.data(), ParamTypes.size(), 2056 OldProto->getExtProtoInfo()); 2057 New->setType(NewQType); 2058 New->setHasInheritedPrototype(); 2059 2060 // Synthesize a parameter for each argument type. 2061 SmallVector<ParmVarDecl*, 16> Params; 2062 for (FunctionProtoType::arg_type_iterator 2063 ParamType = OldProto->arg_type_begin(), 2064 ParamEnd = OldProto->arg_type_end(); 2065 ParamType != ParamEnd; ++ParamType) { 2066 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 2067 SourceLocation(), 2068 SourceLocation(), 0, 2069 *ParamType, /*TInfo=*/0, 2070 SC_None, SC_None, 2071 0); 2072 Param->setScopeInfo(0, Params.size()); 2073 Param->setImplicit(); 2074 Params.push_back(Param); 2075 } 2076 2077 New->setParams(Params); 2078 } 2079 2080 return MergeCompatibleFunctionDecls(New, Old, S); 2081 } 2082 2083 // GNU C permits a K&R definition to follow a prototype declaration 2084 // if the declared types of the parameters in the K&R definition 2085 // match the types in the prototype declaration, even when the 2086 // promoted types of the parameters from the K&R definition differ 2087 // from the types in the prototype. GCC then keeps the types from 2088 // the prototype. 2089 // 2090 // If a variadic prototype is followed by a non-variadic K&R definition, 2091 // the K&R definition becomes variadic. This is sort of an edge case, but 2092 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2093 // C99 6.9.1p8. 2094 if (!getLangOpts().CPlusPlus && 2095 Old->hasPrototype() && !New->hasPrototype() && 2096 New->getType()->getAs<FunctionProtoType>() && 2097 Old->getNumParams() == New->getNumParams()) { 2098 SmallVector<QualType, 16> ArgTypes; 2099 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2100 const FunctionProtoType *OldProto 2101 = Old->getType()->getAs<FunctionProtoType>(); 2102 const FunctionProtoType *NewProto 2103 = New->getType()->getAs<FunctionProtoType>(); 2104 2105 // Determine whether this is the GNU C extension. 2106 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2107 NewProto->getResultType()); 2108 bool LooseCompatible = !MergedReturn.isNull(); 2109 for (unsigned Idx = 0, End = Old->getNumParams(); 2110 LooseCompatible && Idx != End; ++Idx) { 2111 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2112 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2113 if (Context.typesAreCompatible(OldParm->getType(), 2114 NewProto->getArgType(Idx))) { 2115 ArgTypes.push_back(NewParm->getType()); 2116 } else if (Context.typesAreCompatible(OldParm->getType(), 2117 NewParm->getType(), 2118 /*CompareUnqualified=*/true)) { 2119 GNUCompatibleParamWarning Warn 2120 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2121 Warnings.push_back(Warn); 2122 ArgTypes.push_back(NewParm->getType()); 2123 } else 2124 LooseCompatible = false; 2125 } 2126 2127 if (LooseCompatible) { 2128 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2129 Diag(Warnings[Warn].NewParm->getLocation(), 2130 diag::ext_param_promoted_not_compatible_with_prototype) 2131 << Warnings[Warn].PromotedType 2132 << Warnings[Warn].OldParm->getType(); 2133 if (Warnings[Warn].OldParm->getLocation().isValid()) 2134 Diag(Warnings[Warn].OldParm->getLocation(), 2135 diag::note_previous_declaration); 2136 } 2137 2138 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2139 ArgTypes.size(), 2140 OldProto->getExtProtoInfo())); 2141 return MergeCompatibleFunctionDecls(New, Old, S); 2142 } 2143 2144 // Fall through to diagnose conflicting types. 2145 } 2146 2147 // A function that has already been declared has been redeclared or defined 2148 // with a different type- show appropriate diagnostic 2149 if (unsigned BuiltinID = Old->getBuiltinID()) { 2150 // The user has declared a builtin function with an incompatible 2151 // signature. 2152 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2153 // The function the user is redeclaring is a library-defined 2154 // function like 'malloc' or 'printf'. Warn about the 2155 // redeclaration, then pretend that we don't know about this 2156 // library built-in. 2157 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2158 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2159 << Old << Old->getType(); 2160 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2161 Old->setInvalidDecl(); 2162 return false; 2163 } 2164 2165 PrevDiag = diag::note_previous_builtin_declaration; 2166 } 2167 2168 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2169 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2170 return true; 2171} 2172 2173/// \brief Completes the merge of two function declarations that are 2174/// known to be compatible. 2175/// 2176/// This routine handles the merging of attributes and other 2177/// properties of function declarations form the old declaration to 2178/// the new declaration, once we know that New is in fact a 2179/// redeclaration of Old. 2180/// 2181/// \returns false 2182bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old, 2183 Scope *S) { 2184 // Merge the attributes 2185 mergeDeclAttributes(New, Old); 2186 2187 // Merge the storage class. 2188 if (Old->getStorageClass() != SC_Extern && 2189 Old->getStorageClass() != SC_None) 2190 New->setStorageClass(Old->getStorageClass()); 2191 2192 // Merge "pure" flag. 2193 if (Old->isPure()) 2194 New->setPure(); 2195 2196 // Merge attributes from the parameters. These can mismatch with K&R 2197 // declarations. 2198 if (New->getNumParams() == Old->getNumParams()) 2199 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2200 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2201 Context); 2202 2203 if (getLangOpts().CPlusPlus) 2204 return MergeCXXFunctionDecl(New, Old, S); 2205 2206 return false; 2207} 2208 2209 2210void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2211 ObjCMethodDecl *oldMethod) { 2212 // We don't want to merge unavailable and deprecated attributes 2213 // except from interface to implementation. 2214 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2215 2216 // Merge the attributes. 2217 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2218 2219 // Merge attributes from the parameters. 2220 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2221 for (ObjCMethodDecl::param_iterator 2222 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2223 ni != ne; ++ni, ++oi) 2224 mergeParamDeclAttributes(*ni, *oi, Context); 2225 2226 CheckObjCMethodOverride(newMethod, oldMethod, true); 2227} 2228 2229/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2230/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2231/// emitting diagnostics as appropriate. 2232/// 2233/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2234/// to here in AddInitializerToDecl. We can't check them before the initializer 2235/// is attached. 2236void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2237 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2238 return; 2239 2240 QualType MergedT; 2241 if (getLangOpts().CPlusPlus) { 2242 AutoType *AT = New->getType()->getContainedAutoType(); 2243 if (AT && !AT->isDeduced()) { 2244 // We don't know what the new type is until the initializer is attached. 2245 return; 2246 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2247 // These could still be something that needs exception specs checked. 2248 return MergeVarDeclExceptionSpecs(New, Old); 2249 } 2250 // C++ [basic.link]p10: 2251 // [...] the types specified by all declarations referring to a given 2252 // object or function shall be identical, except that declarations for an 2253 // array object can specify array types that differ by the presence or 2254 // absence of a major array bound (8.3.4). 2255 else if (Old->getType()->isIncompleteArrayType() && 2256 New->getType()->isArrayType()) { 2257 CanQual<ArrayType> OldArray 2258 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2259 CanQual<ArrayType> NewArray 2260 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2261 if (OldArray->getElementType() == NewArray->getElementType()) 2262 MergedT = New->getType(); 2263 } else if (Old->getType()->isArrayType() && 2264 New->getType()->isIncompleteArrayType()) { 2265 CanQual<ArrayType> OldArray 2266 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2267 CanQual<ArrayType> NewArray 2268 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2269 if (OldArray->getElementType() == NewArray->getElementType()) 2270 MergedT = Old->getType(); 2271 } else if (New->getType()->isObjCObjectPointerType() 2272 && Old->getType()->isObjCObjectPointerType()) { 2273 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2274 Old->getType()); 2275 } 2276 } else { 2277 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2278 } 2279 if (MergedT.isNull()) { 2280 Diag(New->getLocation(), diag::err_redefinition_different_type) 2281 << New->getDeclName(); 2282 Diag(Old->getLocation(), diag::note_previous_definition); 2283 return New->setInvalidDecl(); 2284 } 2285 New->setType(MergedT); 2286} 2287 2288/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2289/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2290/// situation, merging decls or emitting diagnostics as appropriate. 2291/// 2292/// Tentative definition rules (C99 6.9.2p2) are checked by 2293/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2294/// definitions here, since the initializer hasn't been attached. 2295/// 2296void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2297 // If the new decl is already invalid, don't do any other checking. 2298 if (New->isInvalidDecl()) 2299 return; 2300 2301 // Verify the old decl was also a variable. 2302 VarDecl *Old = 0; 2303 if (!Previous.isSingleResult() || 2304 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2305 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2306 << New->getDeclName(); 2307 Diag(Previous.getRepresentativeDecl()->getLocation(), 2308 diag::note_previous_definition); 2309 return New->setInvalidDecl(); 2310 } 2311 2312 // C++ [class.mem]p1: 2313 // A member shall not be declared twice in the member-specification [...] 2314 // 2315 // Here, we need only consider static data members. 2316 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2317 Diag(New->getLocation(), diag::err_duplicate_member) 2318 << New->getIdentifier(); 2319 Diag(Old->getLocation(), diag::note_previous_declaration); 2320 New->setInvalidDecl(); 2321 } 2322 2323 mergeDeclAttributes(New, Old); 2324 // Warn if an already-declared variable is made a weak_import in a subsequent 2325 // declaration 2326 if (New->getAttr<WeakImportAttr>() && 2327 Old->getStorageClass() == SC_None && 2328 !Old->getAttr<WeakImportAttr>()) { 2329 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2330 Diag(Old->getLocation(), diag::note_previous_definition); 2331 // Remove weak_import attribute on new declaration. 2332 New->dropAttr<WeakImportAttr>(); 2333 } 2334 2335 // Merge the types. 2336 MergeVarDeclTypes(New, Old); 2337 if (New->isInvalidDecl()) 2338 return; 2339 2340 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2341 if (New->getStorageClass() == SC_Static && 2342 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2343 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2344 Diag(Old->getLocation(), diag::note_previous_definition); 2345 return New->setInvalidDecl(); 2346 } 2347 // C99 6.2.2p4: 2348 // For an identifier declared with the storage-class specifier 2349 // extern in a scope in which a prior declaration of that 2350 // identifier is visible,23) if the prior declaration specifies 2351 // internal or external linkage, the linkage of the identifier at 2352 // the later declaration is the same as the linkage specified at 2353 // the prior declaration. If no prior declaration is visible, or 2354 // if the prior declaration specifies no linkage, then the 2355 // identifier has external linkage. 2356 if (New->hasExternalStorage() && Old->hasLinkage()) 2357 /* Okay */; 2358 else if (New->getStorageClass() != SC_Static && 2359 Old->getStorageClass() == SC_Static) { 2360 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2361 Diag(Old->getLocation(), diag::note_previous_definition); 2362 return New->setInvalidDecl(); 2363 } 2364 2365 // Check if extern is followed by non-extern and vice-versa. 2366 if (New->hasExternalStorage() && 2367 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2368 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2369 Diag(Old->getLocation(), diag::note_previous_definition); 2370 return New->setInvalidDecl(); 2371 } 2372 if (Old->hasExternalStorage() && 2373 !New->hasLinkage() && New->isLocalVarDecl()) { 2374 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2375 Diag(Old->getLocation(), diag::note_previous_definition); 2376 return New->setInvalidDecl(); 2377 } 2378 2379 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2380 2381 // FIXME: The test for external storage here seems wrong? We still 2382 // need to check for mismatches. 2383 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2384 // Don't complain about out-of-line definitions of static members. 2385 !(Old->getLexicalDeclContext()->isRecord() && 2386 !New->getLexicalDeclContext()->isRecord())) { 2387 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2388 Diag(Old->getLocation(), diag::note_previous_definition); 2389 return New->setInvalidDecl(); 2390 } 2391 2392 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2393 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2394 Diag(Old->getLocation(), diag::note_previous_definition); 2395 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2396 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2397 Diag(Old->getLocation(), diag::note_previous_definition); 2398 } 2399 2400 // C++ doesn't have tentative definitions, so go right ahead and check here. 2401 const VarDecl *Def; 2402 if (getLangOpts().CPlusPlus && 2403 New->isThisDeclarationADefinition() == VarDecl::Definition && 2404 (Def = Old->getDefinition())) { 2405 Diag(New->getLocation(), diag::err_redefinition) 2406 << New->getDeclName(); 2407 Diag(Def->getLocation(), diag::note_previous_definition); 2408 New->setInvalidDecl(); 2409 return; 2410 } 2411 // c99 6.2.2 P4. 2412 // For an identifier declared with the storage-class specifier extern in a 2413 // scope in which a prior declaration of that identifier is visible, if 2414 // the prior declaration specifies internal or external linkage, the linkage 2415 // of the identifier at the later declaration is the same as the linkage 2416 // specified at the prior declaration. 2417 // FIXME. revisit this code. 2418 if (New->hasExternalStorage() && 2419 Old->getLinkage() == InternalLinkage && 2420 New->getDeclContext() == Old->getDeclContext()) 2421 New->setStorageClass(Old->getStorageClass()); 2422 2423 // Keep a chain of previous declarations. 2424 New->setPreviousDeclaration(Old); 2425 2426 // Inherit access appropriately. 2427 New->setAccess(Old->getAccess()); 2428} 2429 2430/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2431/// no declarator (e.g. "struct foo;") is parsed. 2432Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2433 DeclSpec &DS) { 2434 return ParsedFreeStandingDeclSpec(S, AS, DS, 2435 MultiTemplateParamsArg(*this, 0, 0)); 2436} 2437 2438/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2439/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2440/// parameters to cope with template friend declarations. 2441Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2442 DeclSpec &DS, 2443 MultiTemplateParamsArg TemplateParams) { 2444 Decl *TagD = 0; 2445 TagDecl *Tag = 0; 2446 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2447 DS.getTypeSpecType() == DeclSpec::TST_struct || 2448 DS.getTypeSpecType() == DeclSpec::TST_union || 2449 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2450 TagD = DS.getRepAsDecl(); 2451 2452 if (!TagD) // We probably had an error 2453 return 0; 2454 2455 // Note that the above type specs guarantee that the 2456 // type rep is a Decl, whereas in many of the others 2457 // it's a Type. 2458 if (isa<TagDecl>(TagD)) 2459 Tag = cast<TagDecl>(TagD); 2460 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2461 Tag = CTD->getTemplatedDecl(); 2462 } 2463 2464 if (Tag) { 2465 Tag->setFreeStanding(); 2466 if (Tag->isInvalidDecl()) 2467 return Tag; 2468 } 2469 2470 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2471 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2472 // or incomplete types shall not be restrict-qualified." 2473 if (TypeQuals & DeclSpec::TQ_restrict) 2474 Diag(DS.getRestrictSpecLoc(), 2475 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2476 << DS.getSourceRange(); 2477 } 2478 2479 if (DS.isConstexprSpecified()) { 2480 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2481 // and definitions of functions and variables. 2482 if (Tag) 2483 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2484 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2485 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2486 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2487 else 2488 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2489 // Don't emit warnings after this error. 2490 return TagD; 2491 } 2492 2493 if (DS.isFriendSpecified()) { 2494 // If we're dealing with a decl but not a TagDecl, assume that 2495 // whatever routines created it handled the friendship aspect. 2496 if (TagD && !Tag) 2497 return 0; 2498 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2499 } 2500 2501 // Track whether we warned about the fact that there aren't any 2502 // declarators. 2503 bool emittedWarning = false; 2504 2505 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2506 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2507 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2508 if (getLangOpts().CPlusPlus || 2509 Record->getDeclContext()->isRecord()) 2510 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2511 2512 Diag(DS.getLocStart(), diag::ext_no_declarators) 2513 << DS.getSourceRange(); 2514 emittedWarning = true; 2515 } 2516 } 2517 2518 // Check for Microsoft C extension: anonymous struct. 2519 if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus && 2520 CurContext->isRecord() && 2521 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2522 // Handle 2 kinds of anonymous struct: 2523 // struct STRUCT; 2524 // and 2525 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2526 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2527 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2528 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2529 DS.getRepAsType().get()->isStructureType())) { 2530 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct) 2531 << DS.getSourceRange(); 2532 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2533 } 2534 } 2535 2536 if (getLangOpts().CPlusPlus && 2537 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2538 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2539 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2540 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2541 Diag(Enum->getLocation(), diag::ext_no_declarators) 2542 << DS.getSourceRange(); 2543 emittedWarning = true; 2544 } 2545 2546 // Skip all the checks below if we have a type error. 2547 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2548 2549 if (!DS.isMissingDeclaratorOk()) { 2550 // Warn about typedefs of enums without names, since this is an 2551 // extension in both Microsoft and GNU. 2552 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2553 Tag && isa<EnumDecl>(Tag)) { 2554 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name) 2555 << DS.getSourceRange(); 2556 return Tag; 2557 } 2558 2559 Diag(DS.getLocStart(), diag::ext_no_declarators) 2560 << DS.getSourceRange(); 2561 emittedWarning = true; 2562 } 2563 2564 // We're going to complain about a bunch of spurious specifiers; 2565 // only do this if we're declaring a tag, because otherwise we 2566 // should be getting diag::ext_no_declarators. 2567 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2568 return TagD; 2569 2570 // Note that a linkage-specification sets a storage class, but 2571 // 'extern "C" struct foo;' is actually valid and not theoretically 2572 // useless. 2573 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2574 if (!DS.isExternInLinkageSpec()) 2575 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2576 << DeclSpec::getSpecifierName(scs); 2577 2578 if (DS.isThreadSpecified()) 2579 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2580 if (DS.getTypeQualifiers()) { 2581 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2582 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2583 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2584 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2585 // Restrict is covered above. 2586 } 2587 if (DS.isInlineSpecified()) 2588 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2589 if (DS.isVirtualSpecified()) 2590 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2591 if (DS.isExplicitSpecified()) 2592 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2593 2594 if (DS.isModulePrivateSpecified() && 2595 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2596 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2597 << Tag->getTagKind() 2598 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2599 2600 // Warn about ignored type attributes, for example: 2601 // __attribute__((aligned)) struct A; 2602 // Attributes should be placed after tag to apply to type declaration. 2603 if (!DS.getAttributes().empty()) { 2604 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2605 if (TypeSpecType == DeclSpec::TST_class || 2606 TypeSpecType == DeclSpec::TST_struct || 2607 TypeSpecType == DeclSpec::TST_union || 2608 TypeSpecType == DeclSpec::TST_enum) { 2609 AttributeList* attrs = DS.getAttributes().getList(); 2610 while (attrs) { 2611 Diag(attrs->getScopeLoc(), 2612 diag::warn_declspec_attribute_ignored) 2613 << attrs->getName() 2614 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2615 TypeSpecType == DeclSpec::TST_struct ? 1 : 2616 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2617 attrs = attrs->getNext(); 2618 } 2619 } 2620 } 2621 2622 return TagD; 2623} 2624 2625/// We are trying to inject an anonymous member into the given scope; 2626/// check if there's an existing declaration that can't be overloaded. 2627/// 2628/// \return true if this is a forbidden redeclaration 2629static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2630 Scope *S, 2631 DeclContext *Owner, 2632 DeclarationName Name, 2633 SourceLocation NameLoc, 2634 unsigned diagnostic) { 2635 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2636 Sema::ForRedeclaration); 2637 if (!SemaRef.LookupName(R, S)) return false; 2638 2639 if (R.getAsSingle<TagDecl>()) 2640 return false; 2641 2642 // Pick a representative declaration. 2643 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2644 assert(PrevDecl && "Expected a non-null Decl"); 2645 2646 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2647 return false; 2648 2649 SemaRef.Diag(NameLoc, diagnostic) << Name; 2650 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2651 2652 return true; 2653} 2654 2655/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2656/// anonymous struct or union AnonRecord into the owning context Owner 2657/// and scope S. This routine will be invoked just after we realize 2658/// that an unnamed union or struct is actually an anonymous union or 2659/// struct, e.g., 2660/// 2661/// @code 2662/// union { 2663/// int i; 2664/// float f; 2665/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2666/// // f into the surrounding scope.x 2667/// @endcode 2668/// 2669/// This routine is recursive, injecting the names of nested anonymous 2670/// structs/unions into the owning context and scope as well. 2671static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2672 DeclContext *Owner, 2673 RecordDecl *AnonRecord, 2674 AccessSpecifier AS, 2675 SmallVector<NamedDecl*, 2> &Chaining, 2676 bool MSAnonStruct) { 2677 unsigned diagKind 2678 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2679 : diag::err_anonymous_struct_member_redecl; 2680 2681 bool Invalid = false; 2682 2683 // Look every FieldDecl and IndirectFieldDecl with a name. 2684 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2685 DEnd = AnonRecord->decls_end(); 2686 D != DEnd; ++D) { 2687 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2688 cast<NamedDecl>(*D)->getDeclName()) { 2689 ValueDecl *VD = cast<ValueDecl>(*D); 2690 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2691 VD->getLocation(), diagKind)) { 2692 // C++ [class.union]p2: 2693 // The names of the members of an anonymous union shall be 2694 // distinct from the names of any other entity in the 2695 // scope in which the anonymous union is declared. 2696 Invalid = true; 2697 } else { 2698 // C++ [class.union]p2: 2699 // For the purpose of name lookup, after the anonymous union 2700 // definition, the members of the anonymous union are 2701 // considered to have been defined in the scope in which the 2702 // anonymous union is declared. 2703 unsigned OldChainingSize = Chaining.size(); 2704 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2705 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2706 PE = IF->chain_end(); PI != PE; ++PI) 2707 Chaining.push_back(*PI); 2708 else 2709 Chaining.push_back(VD); 2710 2711 assert(Chaining.size() >= 2); 2712 NamedDecl **NamedChain = 2713 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2714 for (unsigned i = 0; i < Chaining.size(); i++) 2715 NamedChain[i] = Chaining[i]; 2716 2717 IndirectFieldDecl* IndirectField = 2718 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2719 VD->getIdentifier(), VD->getType(), 2720 NamedChain, Chaining.size()); 2721 2722 IndirectField->setAccess(AS); 2723 IndirectField->setImplicit(); 2724 SemaRef.PushOnScopeChains(IndirectField, S); 2725 2726 // That includes picking up the appropriate access specifier. 2727 if (AS != AS_none) IndirectField->setAccess(AS); 2728 2729 Chaining.resize(OldChainingSize); 2730 } 2731 } 2732 } 2733 2734 return Invalid; 2735} 2736 2737/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2738/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2739/// illegal input values are mapped to SC_None. 2740static StorageClass 2741StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2742 switch (StorageClassSpec) { 2743 case DeclSpec::SCS_unspecified: return SC_None; 2744 case DeclSpec::SCS_extern: return SC_Extern; 2745 case DeclSpec::SCS_static: return SC_Static; 2746 case DeclSpec::SCS_auto: return SC_Auto; 2747 case DeclSpec::SCS_register: return SC_Register; 2748 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2749 // Illegal SCSs map to None: error reporting is up to the caller. 2750 case DeclSpec::SCS_mutable: // Fall through. 2751 case DeclSpec::SCS_typedef: return SC_None; 2752 } 2753 llvm_unreachable("unknown storage class specifier"); 2754} 2755 2756/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2757/// a StorageClass. Any error reporting is up to the caller: 2758/// illegal input values are mapped to SC_None. 2759static StorageClass 2760StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2761 switch (StorageClassSpec) { 2762 case DeclSpec::SCS_unspecified: return SC_None; 2763 case DeclSpec::SCS_extern: return SC_Extern; 2764 case DeclSpec::SCS_static: return SC_Static; 2765 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2766 // Illegal SCSs map to None: error reporting is up to the caller. 2767 case DeclSpec::SCS_auto: // Fall through. 2768 case DeclSpec::SCS_mutable: // Fall through. 2769 case DeclSpec::SCS_register: // Fall through. 2770 case DeclSpec::SCS_typedef: return SC_None; 2771 } 2772 llvm_unreachable("unknown storage class specifier"); 2773} 2774 2775/// BuildAnonymousStructOrUnion - Handle the declaration of an 2776/// anonymous structure or union. Anonymous unions are a C++ feature 2777/// (C++ [class.union]) and a C11 feature; anonymous structures 2778/// are a C11 feature and GNU C++ extension. 2779Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2780 AccessSpecifier AS, 2781 RecordDecl *Record) { 2782 DeclContext *Owner = Record->getDeclContext(); 2783 2784 // Diagnose whether this anonymous struct/union is an extension. 2785 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11) 2786 Diag(Record->getLocation(), diag::ext_anonymous_union); 2787 else if (!Record->isUnion() && getLangOpts().CPlusPlus) 2788 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2789 else if (!Record->isUnion() && !getLangOpts().C11) 2790 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2791 2792 // C and C++ require different kinds of checks for anonymous 2793 // structs/unions. 2794 bool Invalid = false; 2795 if (getLangOpts().CPlusPlus) { 2796 const char* PrevSpec = 0; 2797 unsigned DiagID; 2798 if (Record->isUnion()) { 2799 // C++ [class.union]p6: 2800 // Anonymous unions declared in a named namespace or in the 2801 // global namespace shall be declared static. 2802 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2803 (isa<TranslationUnitDecl>(Owner) || 2804 (isa<NamespaceDecl>(Owner) && 2805 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2806 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2807 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2808 2809 // Recover by adding 'static'. 2810 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2811 PrevSpec, DiagID); 2812 } 2813 // C++ [class.union]p6: 2814 // A storage class is not allowed in a declaration of an 2815 // anonymous union in a class scope. 2816 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2817 isa<RecordDecl>(Owner)) { 2818 Diag(DS.getStorageClassSpecLoc(), 2819 diag::err_anonymous_union_with_storage_spec) 2820 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2821 2822 // Recover by removing the storage specifier. 2823 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2824 SourceLocation(), 2825 PrevSpec, DiagID); 2826 } 2827 } 2828 2829 // Ignore const/volatile/restrict qualifiers. 2830 if (DS.getTypeQualifiers()) { 2831 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2832 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2833 << Record->isUnion() << 0 2834 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2835 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2836 Diag(DS.getVolatileSpecLoc(), 2837 diag::ext_anonymous_struct_union_qualified) 2838 << Record->isUnion() << 1 2839 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2840 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2841 Diag(DS.getRestrictSpecLoc(), 2842 diag::ext_anonymous_struct_union_qualified) 2843 << Record->isUnion() << 2 2844 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2845 2846 DS.ClearTypeQualifiers(); 2847 } 2848 2849 // C++ [class.union]p2: 2850 // The member-specification of an anonymous union shall only 2851 // define non-static data members. [Note: nested types and 2852 // functions cannot be declared within an anonymous union. ] 2853 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2854 MemEnd = Record->decls_end(); 2855 Mem != MemEnd; ++Mem) { 2856 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2857 // C++ [class.union]p3: 2858 // An anonymous union shall not have private or protected 2859 // members (clause 11). 2860 assert(FD->getAccess() != AS_none); 2861 if (FD->getAccess() != AS_public) { 2862 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2863 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2864 Invalid = true; 2865 } 2866 2867 // C++ [class.union]p1 2868 // An object of a class with a non-trivial constructor, a non-trivial 2869 // copy constructor, a non-trivial destructor, or a non-trivial copy 2870 // assignment operator cannot be a member of a union, nor can an 2871 // array of such objects. 2872 if (CheckNontrivialField(FD)) 2873 Invalid = true; 2874 } else if ((*Mem)->isImplicit()) { 2875 // Any implicit members are fine. 2876 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2877 // This is a type that showed up in an 2878 // elaborated-type-specifier inside the anonymous struct or 2879 // union, but which actually declares a type outside of the 2880 // anonymous struct or union. It's okay. 2881 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2882 if (!MemRecord->isAnonymousStructOrUnion() && 2883 MemRecord->getDeclName()) { 2884 // Visual C++ allows type definition in anonymous struct or union. 2885 if (getLangOpts().MicrosoftExt) 2886 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2887 << (int)Record->isUnion(); 2888 else { 2889 // This is a nested type declaration. 2890 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2891 << (int)Record->isUnion(); 2892 Invalid = true; 2893 } 2894 } 2895 } else if (isa<AccessSpecDecl>(*Mem)) { 2896 // Any access specifier is fine. 2897 } else { 2898 // We have something that isn't a non-static data 2899 // member. Complain about it. 2900 unsigned DK = diag::err_anonymous_record_bad_member; 2901 if (isa<TypeDecl>(*Mem)) 2902 DK = diag::err_anonymous_record_with_type; 2903 else if (isa<FunctionDecl>(*Mem)) 2904 DK = diag::err_anonymous_record_with_function; 2905 else if (isa<VarDecl>(*Mem)) 2906 DK = diag::err_anonymous_record_with_static; 2907 2908 // Visual C++ allows type definition in anonymous struct or union. 2909 if (getLangOpts().MicrosoftExt && 2910 DK == diag::err_anonymous_record_with_type) 2911 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2912 << (int)Record->isUnion(); 2913 else { 2914 Diag((*Mem)->getLocation(), DK) 2915 << (int)Record->isUnion(); 2916 Invalid = true; 2917 } 2918 } 2919 } 2920 } 2921 2922 if (!Record->isUnion() && !Owner->isRecord()) { 2923 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2924 << (int)getLangOpts().CPlusPlus; 2925 Invalid = true; 2926 } 2927 2928 // Mock up a declarator. 2929 Declarator Dc(DS, Declarator::MemberContext); 2930 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2931 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2932 2933 // Create a declaration for this anonymous struct/union. 2934 NamedDecl *Anon = 0; 2935 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2936 Anon = FieldDecl::Create(Context, OwningClass, 2937 DS.getLocStart(), 2938 Record->getLocation(), 2939 /*IdentifierInfo=*/0, 2940 Context.getTypeDeclType(Record), 2941 TInfo, 2942 /*BitWidth=*/0, /*Mutable=*/false, 2943 /*HasInit=*/false); 2944 Anon->setAccess(AS); 2945 if (getLangOpts().CPlusPlus) 2946 FieldCollector->Add(cast<FieldDecl>(Anon)); 2947 } else { 2948 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2949 assert(SCSpec != DeclSpec::SCS_typedef && 2950 "Parser allowed 'typedef' as storage class VarDecl."); 2951 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2952 if (SCSpec == DeclSpec::SCS_mutable) { 2953 // mutable can only appear on non-static class members, so it's always 2954 // an error here 2955 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2956 Invalid = true; 2957 SC = SC_None; 2958 } 2959 SCSpec = DS.getStorageClassSpecAsWritten(); 2960 VarDecl::StorageClass SCAsWritten 2961 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2962 2963 Anon = VarDecl::Create(Context, Owner, 2964 DS.getLocStart(), 2965 Record->getLocation(), /*IdentifierInfo=*/0, 2966 Context.getTypeDeclType(Record), 2967 TInfo, SC, SCAsWritten); 2968 2969 // Default-initialize the implicit variable. This initialization will be 2970 // trivial in almost all cases, except if a union member has an in-class 2971 // initializer: 2972 // union { int n = 0; }; 2973 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2974 } 2975 Anon->setImplicit(); 2976 2977 // Add the anonymous struct/union object to the current 2978 // context. We'll be referencing this object when we refer to one of 2979 // its members. 2980 Owner->addDecl(Anon); 2981 2982 // Inject the members of the anonymous struct/union into the owning 2983 // context and into the identifier resolver chain for name lookup 2984 // purposes. 2985 SmallVector<NamedDecl*, 2> Chain; 2986 Chain.push_back(Anon); 2987 2988 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2989 Chain, false)) 2990 Invalid = true; 2991 2992 // Mark this as an anonymous struct/union type. Note that we do not 2993 // do this until after we have already checked and injected the 2994 // members of this anonymous struct/union type, because otherwise 2995 // the members could be injected twice: once by DeclContext when it 2996 // builds its lookup table, and once by 2997 // InjectAnonymousStructOrUnionMembers. 2998 Record->setAnonymousStructOrUnion(true); 2999 3000 if (Invalid) 3001 Anon->setInvalidDecl(); 3002 3003 return Anon; 3004} 3005 3006/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 3007/// Microsoft C anonymous structure. 3008/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 3009/// Example: 3010/// 3011/// struct A { int a; }; 3012/// struct B { struct A; int b; }; 3013/// 3014/// void foo() { 3015/// B var; 3016/// var.a = 3; 3017/// } 3018/// 3019Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 3020 RecordDecl *Record) { 3021 3022 // If there is no Record, get the record via the typedef. 3023 if (!Record) 3024 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 3025 3026 // Mock up a declarator. 3027 Declarator Dc(DS, Declarator::TypeNameContext); 3028 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 3029 assert(TInfo && "couldn't build declarator info for anonymous struct"); 3030 3031 // Create a declaration for this anonymous struct. 3032 NamedDecl* Anon = FieldDecl::Create(Context, 3033 cast<RecordDecl>(CurContext), 3034 DS.getLocStart(), 3035 DS.getLocStart(), 3036 /*IdentifierInfo=*/0, 3037 Context.getTypeDeclType(Record), 3038 TInfo, 3039 /*BitWidth=*/0, /*Mutable=*/false, 3040 /*HasInit=*/false); 3041 Anon->setImplicit(); 3042 3043 // Add the anonymous struct object to the current context. 3044 CurContext->addDecl(Anon); 3045 3046 // Inject the members of the anonymous struct into the current 3047 // context and into the identifier resolver chain for name lookup 3048 // purposes. 3049 SmallVector<NamedDecl*, 2> Chain; 3050 Chain.push_back(Anon); 3051 3052 RecordDecl *RecordDef = Record->getDefinition(); 3053 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 3054 RecordDef, AS_none, 3055 Chain, true)) 3056 Anon->setInvalidDecl(); 3057 3058 return Anon; 3059} 3060 3061/// GetNameForDeclarator - Determine the full declaration name for the 3062/// given Declarator. 3063DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 3064 return GetNameFromUnqualifiedId(D.getName()); 3065} 3066 3067/// \brief Retrieves the declaration name from a parsed unqualified-id. 3068DeclarationNameInfo 3069Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 3070 DeclarationNameInfo NameInfo; 3071 NameInfo.setLoc(Name.StartLocation); 3072 3073 switch (Name.getKind()) { 3074 3075 case UnqualifiedId::IK_ImplicitSelfParam: 3076 case UnqualifiedId::IK_Identifier: 3077 NameInfo.setName(Name.Identifier); 3078 NameInfo.setLoc(Name.StartLocation); 3079 return NameInfo; 3080 3081 case UnqualifiedId::IK_OperatorFunctionId: 3082 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 3083 Name.OperatorFunctionId.Operator)); 3084 NameInfo.setLoc(Name.StartLocation); 3085 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 3086 = Name.OperatorFunctionId.SymbolLocations[0]; 3087 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 3088 = Name.EndLocation.getRawEncoding(); 3089 return NameInfo; 3090 3091 case UnqualifiedId::IK_LiteralOperatorId: 3092 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 3093 Name.Identifier)); 3094 NameInfo.setLoc(Name.StartLocation); 3095 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3096 return NameInfo; 3097 3098 case UnqualifiedId::IK_ConversionFunctionId: { 3099 TypeSourceInfo *TInfo; 3100 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3101 if (Ty.isNull()) 3102 return DeclarationNameInfo(); 3103 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3104 Context.getCanonicalType(Ty))); 3105 NameInfo.setLoc(Name.StartLocation); 3106 NameInfo.setNamedTypeInfo(TInfo); 3107 return NameInfo; 3108 } 3109 3110 case UnqualifiedId::IK_ConstructorName: { 3111 TypeSourceInfo *TInfo; 3112 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3113 if (Ty.isNull()) 3114 return DeclarationNameInfo(); 3115 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3116 Context.getCanonicalType(Ty))); 3117 NameInfo.setLoc(Name.StartLocation); 3118 NameInfo.setNamedTypeInfo(TInfo); 3119 return NameInfo; 3120 } 3121 3122 case UnqualifiedId::IK_ConstructorTemplateId: { 3123 // In well-formed code, we can only have a constructor 3124 // template-id that refers to the current context, so go there 3125 // to find the actual type being constructed. 3126 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3127 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3128 return DeclarationNameInfo(); 3129 3130 // Determine the type of the class being constructed. 3131 QualType CurClassType = Context.getTypeDeclType(CurClass); 3132 3133 // FIXME: Check two things: that the template-id names the same type as 3134 // CurClassType, and that the template-id does not occur when the name 3135 // was qualified. 3136 3137 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3138 Context.getCanonicalType(CurClassType))); 3139 NameInfo.setLoc(Name.StartLocation); 3140 // FIXME: should we retrieve TypeSourceInfo? 3141 NameInfo.setNamedTypeInfo(0); 3142 return NameInfo; 3143 } 3144 3145 case UnqualifiedId::IK_DestructorName: { 3146 TypeSourceInfo *TInfo; 3147 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3148 if (Ty.isNull()) 3149 return DeclarationNameInfo(); 3150 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3151 Context.getCanonicalType(Ty))); 3152 NameInfo.setLoc(Name.StartLocation); 3153 NameInfo.setNamedTypeInfo(TInfo); 3154 return NameInfo; 3155 } 3156 3157 case UnqualifiedId::IK_TemplateId: { 3158 TemplateName TName = Name.TemplateId->Template.get(); 3159 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3160 return Context.getNameForTemplate(TName, TNameLoc); 3161 } 3162 3163 } // switch (Name.getKind()) 3164 3165 llvm_unreachable("Unknown name kind"); 3166} 3167 3168static QualType getCoreType(QualType Ty) { 3169 do { 3170 if (Ty->isPointerType() || Ty->isReferenceType()) 3171 Ty = Ty->getPointeeType(); 3172 else if (Ty->isArrayType()) 3173 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3174 else 3175 return Ty.withoutLocalFastQualifiers(); 3176 } while (true); 3177} 3178 3179/// hasSimilarParameters - Determine whether the C++ functions Declaration 3180/// and Definition have "nearly" matching parameters. This heuristic is 3181/// used to improve diagnostics in the case where an out-of-line function 3182/// definition doesn't match any declaration within the class or namespace. 3183/// Also sets Params to the list of indices to the parameters that differ 3184/// between the declaration and the definition. If hasSimilarParameters 3185/// returns true and Params is empty, then all of the parameters match. 3186static bool hasSimilarParameters(ASTContext &Context, 3187 FunctionDecl *Declaration, 3188 FunctionDecl *Definition, 3189 llvm::SmallVectorImpl<unsigned> &Params) { 3190 Params.clear(); 3191 if (Declaration->param_size() != Definition->param_size()) 3192 return false; 3193 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3194 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3195 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3196 3197 // The parameter types are identical 3198 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3199 continue; 3200 3201 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3202 QualType DefParamBaseTy = getCoreType(DefParamTy); 3203 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3204 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3205 3206 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3207 (DeclTyName && DeclTyName == DefTyName)) 3208 Params.push_back(Idx); 3209 else // The two parameters aren't even close 3210 return false; 3211 } 3212 3213 return true; 3214} 3215 3216/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3217/// declarator needs to be rebuilt in the current instantiation. 3218/// Any bits of declarator which appear before the name are valid for 3219/// consideration here. That's specifically the type in the decl spec 3220/// and the base type in any member-pointer chunks. 3221static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3222 DeclarationName Name) { 3223 // The types we specifically need to rebuild are: 3224 // - typenames, typeofs, and decltypes 3225 // - types which will become injected class names 3226 // Of course, we also need to rebuild any type referencing such a 3227 // type. It's safest to just say "dependent", but we call out a 3228 // few cases here. 3229 3230 DeclSpec &DS = D.getMutableDeclSpec(); 3231 switch (DS.getTypeSpecType()) { 3232 case DeclSpec::TST_typename: 3233 case DeclSpec::TST_typeofType: 3234 case DeclSpec::TST_decltype: 3235 case DeclSpec::TST_underlyingType: 3236 case DeclSpec::TST_atomic: { 3237 // Grab the type from the parser. 3238 TypeSourceInfo *TSI = 0; 3239 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3240 if (T.isNull() || !T->isDependentType()) break; 3241 3242 // Make sure there's a type source info. This isn't really much 3243 // of a waste; most dependent types should have type source info 3244 // attached already. 3245 if (!TSI) 3246 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3247 3248 // Rebuild the type in the current instantiation. 3249 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3250 if (!TSI) return true; 3251 3252 // Store the new type back in the decl spec. 3253 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3254 DS.UpdateTypeRep(LocType); 3255 break; 3256 } 3257 3258 case DeclSpec::TST_typeofExpr: { 3259 Expr *E = DS.getRepAsExpr(); 3260 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3261 if (Result.isInvalid()) return true; 3262 DS.UpdateExprRep(Result.get()); 3263 break; 3264 } 3265 3266 default: 3267 // Nothing to do for these decl specs. 3268 break; 3269 } 3270 3271 // It doesn't matter what order we do this in. 3272 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3273 DeclaratorChunk &Chunk = D.getTypeObject(I); 3274 3275 // The only type information in the declarator which can come 3276 // before the declaration name is the base type of a member 3277 // pointer. 3278 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3279 continue; 3280 3281 // Rebuild the scope specifier in-place. 3282 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3283 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3284 return true; 3285 } 3286 3287 return false; 3288} 3289 3290Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3291 D.setFunctionDefinitionKind(FDK_Declaration); 3292 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3293 3294 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3295 Dcl && Dcl->getDeclContext()->isFileContext()) 3296 Dcl->setTopLevelDeclInObjCContainer(); 3297 3298 return Dcl; 3299} 3300 3301/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3302/// If T is the name of a class, then each of the following shall have a 3303/// name different from T: 3304/// - every static data member of class T; 3305/// - every member function of class T 3306/// - every member of class T that is itself a type; 3307/// \returns true if the declaration name violates these rules. 3308bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3309 DeclarationNameInfo NameInfo) { 3310 DeclarationName Name = NameInfo.getName(); 3311 3312 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3313 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3314 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3315 return true; 3316 } 3317 3318 return false; 3319} 3320 3321/// \brief Diagnose a declaration whose declarator-id has the given 3322/// nested-name-specifier. 3323/// 3324/// \param SS The nested-name-specifier of the declarator-id. 3325/// 3326/// \param DC The declaration context to which the nested-name-specifier 3327/// resolves. 3328/// 3329/// \param Name The name of the entity being declared. 3330/// 3331/// \param Loc The location of the name of the entity being declared. 3332/// 3333/// \returns true if we cannot safely recover from this error, false otherwise. 3334bool Sema::diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC, 3335 DeclarationName Name, 3336 SourceLocation Loc) { 3337 DeclContext *Cur = CurContext; 3338 while (isa<LinkageSpecDecl>(Cur)) 3339 Cur = Cur->getParent(); 3340 3341 // C++ [dcl.meaning]p1: 3342 // A declarator-id shall not be qualified except for the definition 3343 // of a member function (9.3) or static data member (9.4) outside of 3344 // its class, the definition or explicit instantiation of a function 3345 // or variable member of a namespace outside of its namespace, or the 3346 // definition of an explicit specialization outside of its namespace, 3347 // or the declaration of a friend function that is a member of 3348 // another class or namespace (11.3). [...] 3349 3350 // The user provided a superfluous scope specifier that refers back to the 3351 // class or namespaces in which the entity is already declared. 3352 // 3353 // class X { 3354 // void X::f(); 3355 // }; 3356 if (Cur->Equals(DC)) { 3357 Diag(Loc, diag::warn_member_extra_qualification) 3358 << Name << FixItHint::CreateRemoval(SS.getRange()); 3359 SS.clear(); 3360 return false; 3361 } 3362 3363 // Check whether the qualifying scope encloses the scope of the original 3364 // declaration. 3365 if (!Cur->Encloses(DC)) { 3366 if (Cur->isRecord()) 3367 Diag(Loc, diag::err_member_qualification) 3368 << Name << SS.getRange(); 3369 else if (isa<TranslationUnitDecl>(DC)) 3370 Diag(Loc, diag::err_invalid_declarator_global_scope) 3371 << Name << SS.getRange(); 3372 else if (isa<FunctionDecl>(Cur)) 3373 Diag(Loc, diag::err_invalid_declarator_in_function) 3374 << Name << SS.getRange(); 3375 else 3376 Diag(Loc, diag::err_invalid_declarator_scope) 3377 << Name << cast<NamedDecl>(Cur) << cast<NamedDecl>(DC) << SS.getRange(); 3378 3379 return true; 3380 } 3381 3382 if (Cur->isRecord()) { 3383 // Cannot qualify members within a class. 3384 Diag(Loc, diag::err_member_qualification) 3385 << Name << SS.getRange(); 3386 SS.clear(); 3387 3388 // C++ constructors and destructors with incorrect scopes can break 3389 // our AST invariants by having the wrong underlying types. If 3390 // that's the case, then drop this declaration entirely. 3391 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3392 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3393 !Context.hasSameType(Name.getCXXNameType(), 3394 Context.getTypeDeclType(cast<CXXRecordDecl>(Cur)))) 3395 return true; 3396 3397 return false; 3398 } 3399 3400 // C++11 [dcl.meaning]p1: 3401 // [...] "The nested-name-specifier of the qualified declarator-id shall 3402 // not begin with a decltype-specifer" 3403 NestedNameSpecifierLoc SpecLoc(SS.getScopeRep(), SS.location_data()); 3404 while (SpecLoc.getPrefix()) 3405 SpecLoc = SpecLoc.getPrefix(); 3406 if (dyn_cast_or_null<DecltypeType>( 3407 SpecLoc.getNestedNameSpecifier()->getAsType())) 3408 Diag(Loc, diag::err_decltype_in_declarator) 3409 << SpecLoc.getTypeLoc().getSourceRange(); 3410 3411 return false; 3412} 3413 3414Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3415 MultiTemplateParamsArg TemplateParamLists) { 3416 // TODO: consider using NameInfo for diagnostic. 3417 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3418 DeclarationName Name = NameInfo.getName(); 3419 3420 // All of these full declarators require an identifier. If it doesn't have 3421 // one, the ParsedFreeStandingDeclSpec action should be used. 3422 if (!Name) { 3423 if (!D.isInvalidType()) // Reject this if we think it is valid. 3424 Diag(D.getDeclSpec().getLocStart(), 3425 diag::err_declarator_need_ident) 3426 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3427 return 0; 3428 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3429 return 0; 3430 3431 // The scope passed in may not be a decl scope. Zip up the scope tree until 3432 // we find one that is. 3433 while ((S->getFlags() & Scope::DeclScope) == 0 || 3434 (S->getFlags() & Scope::TemplateParamScope) != 0) 3435 S = S->getParent(); 3436 3437 DeclContext *DC = CurContext; 3438 if (D.getCXXScopeSpec().isInvalid()) 3439 D.setInvalidType(); 3440 else if (D.getCXXScopeSpec().isSet()) { 3441 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3442 UPPC_DeclarationQualifier)) 3443 return 0; 3444 3445 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3446 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3447 if (!DC) { 3448 // If we could not compute the declaration context, it's because the 3449 // declaration context is dependent but does not refer to a class, 3450 // class template, or class template partial specialization. Complain 3451 // and return early, to avoid the coming semantic disaster. 3452 Diag(D.getIdentifierLoc(), 3453 diag::err_template_qualified_declarator_no_match) 3454 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3455 << D.getCXXScopeSpec().getRange(); 3456 return 0; 3457 } 3458 bool IsDependentContext = DC->isDependentContext(); 3459 3460 if (!IsDependentContext && 3461 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3462 return 0; 3463 3464 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 3465 Diag(D.getIdentifierLoc(), 3466 diag::err_member_def_undefined_record) 3467 << Name << DC << D.getCXXScopeSpec().getRange(); 3468 D.setInvalidType(); 3469 } else if (!D.getDeclSpec().isFriendSpecified()) { 3470 if (diagnoseQualifiedDeclaration(D.getCXXScopeSpec(), DC, 3471 Name, D.getIdentifierLoc())) { 3472 if (DC->isRecord()) 3473 return 0; 3474 3475 D.setInvalidType(); 3476 } 3477 } 3478 3479 // Check whether we need to rebuild the type of the given 3480 // declaration in the current instantiation. 3481 if (EnteringContext && IsDependentContext && 3482 TemplateParamLists.size() != 0) { 3483 ContextRAII SavedContext(*this, DC); 3484 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3485 D.setInvalidType(); 3486 } 3487 } 3488 3489 if (DiagnoseClassNameShadow(DC, NameInfo)) 3490 // If this is a typedef, we'll end up spewing multiple diagnostics. 3491 // Just return early; it's safer. 3492 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3493 return 0; 3494 3495 NamedDecl *New; 3496 3497 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3498 QualType R = TInfo->getType(); 3499 3500 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3501 UPPC_DeclarationType)) 3502 D.setInvalidType(); 3503 3504 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3505 ForRedeclaration); 3506 3507 // See if this is a redefinition of a variable in the same scope. 3508 if (!D.getCXXScopeSpec().isSet()) { 3509 bool IsLinkageLookup = false; 3510 3511 // If the declaration we're planning to build will be a function 3512 // or object with linkage, then look for another declaration with 3513 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3514 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3515 /* Do nothing*/; 3516 else if (R->isFunctionType()) { 3517 if (CurContext->isFunctionOrMethod() || 3518 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3519 IsLinkageLookup = true; 3520 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3521 IsLinkageLookup = true; 3522 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3523 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3524 IsLinkageLookup = true; 3525 3526 if (IsLinkageLookup) 3527 Previous.clear(LookupRedeclarationWithLinkage); 3528 3529 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3530 } else { // Something like "int foo::x;" 3531 LookupQualifiedName(Previous, DC); 3532 3533 // C++ [dcl.meaning]p1: 3534 // When the declarator-id is qualified, the declaration shall refer to a 3535 // previously declared member of the class or namespace to which the 3536 // qualifier refers (or, in the case of a namespace, of an element of the 3537 // inline namespace set of that namespace (7.3.1)) or to a specialization 3538 // thereof; [...] 3539 // 3540 // Note that we already checked the context above, and that we do not have 3541 // enough information to make sure that Previous contains the declaration 3542 // we want to match. For example, given: 3543 // 3544 // class X { 3545 // void f(); 3546 // void f(float); 3547 // }; 3548 // 3549 // void X::f(int) { } // ill-formed 3550 // 3551 // In this case, Previous will point to the overload set 3552 // containing the two f's declared in X, but neither of them 3553 // matches. 3554 3555 // C++ [dcl.meaning]p1: 3556 // [...] the member shall not merely have been introduced by a 3557 // using-declaration in the scope of the class or namespace nominated by 3558 // the nested-name-specifier of the declarator-id. 3559 RemoveUsingDecls(Previous); 3560 } 3561 3562 if (Previous.isSingleResult() && 3563 Previous.getFoundDecl()->isTemplateParameter()) { 3564 // Maybe we will complain about the shadowed template parameter. 3565 if (!D.isInvalidType()) 3566 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3567 Previous.getFoundDecl()); 3568 3569 // Just pretend that we didn't see the previous declaration. 3570 Previous.clear(); 3571 } 3572 3573 // In C++, the previous declaration we find might be a tag type 3574 // (class or enum). In this case, the new declaration will hide the 3575 // tag type. Note that this does does not apply if we're declaring a 3576 // typedef (C++ [dcl.typedef]p4). 3577 if (Previous.isSingleTagDecl() && 3578 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3579 Previous.clear(); 3580 3581 bool AddToScope = true; 3582 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3583 if (TemplateParamLists.size()) { 3584 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3585 return 0; 3586 } 3587 3588 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3589 } else if (R->isFunctionType()) { 3590 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3591 move(TemplateParamLists), 3592 AddToScope); 3593 } else { 3594 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3595 move(TemplateParamLists)); 3596 } 3597 3598 if (New == 0) 3599 return 0; 3600 3601 // If this has an identifier and is not an invalid redeclaration or 3602 // function template specialization, add it to the scope stack. 3603 if (New->getDeclName() && AddToScope && 3604 !(D.isRedeclaration() && New->isInvalidDecl())) 3605 PushOnScopeChains(New, S); 3606 3607 return New; 3608} 3609 3610/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3611/// types into constant array types in certain situations which would otherwise 3612/// be errors (for GCC compatibility). 3613static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3614 ASTContext &Context, 3615 bool &SizeIsNegative, 3616 llvm::APSInt &Oversized) { 3617 // This method tries to turn a variable array into a constant 3618 // array even when the size isn't an ICE. This is necessary 3619 // for compatibility with code that depends on gcc's buggy 3620 // constant expression folding, like struct {char x[(int)(char*)2];} 3621 SizeIsNegative = false; 3622 Oversized = 0; 3623 3624 if (T->isDependentType()) 3625 return QualType(); 3626 3627 QualifierCollector Qs; 3628 const Type *Ty = Qs.strip(T); 3629 3630 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3631 QualType Pointee = PTy->getPointeeType(); 3632 QualType FixedType = 3633 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3634 Oversized); 3635 if (FixedType.isNull()) return FixedType; 3636 FixedType = Context.getPointerType(FixedType); 3637 return Qs.apply(Context, FixedType); 3638 } 3639 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3640 QualType Inner = PTy->getInnerType(); 3641 QualType FixedType = 3642 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3643 Oversized); 3644 if (FixedType.isNull()) return FixedType; 3645 FixedType = Context.getParenType(FixedType); 3646 return Qs.apply(Context, FixedType); 3647 } 3648 3649 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3650 if (!VLATy) 3651 return QualType(); 3652 // FIXME: We should probably handle this case 3653 if (VLATy->getElementType()->isVariablyModifiedType()) 3654 return QualType(); 3655 3656 llvm::APSInt Res; 3657 if (!VLATy->getSizeExpr() || 3658 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3659 return QualType(); 3660 3661 // Check whether the array size is negative. 3662 if (Res.isSigned() && Res.isNegative()) { 3663 SizeIsNegative = true; 3664 return QualType(); 3665 } 3666 3667 // Check whether the array is too large to be addressed. 3668 unsigned ActiveSizeBits 3669 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3670 Res); 3671 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3672 Oversized = Res; 3673 return QualType(); 3674 } 3675 3676 return Context.getConstantArrayType(VLATy->getElementType(), 3677 Res, ArrayType::Normal, 0); 3678} 3679 3680/// \brief Register the given locally-scoped external C declaration so 3681/// that it can be found later for redeclarations 3682void 3683Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3684 const LookupResult &Previous, 3685 Scope *S) { 3686 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3687 "Decl is not a locally-scoped decl!"); 3688 // Note that we have a locally-scoped external with this name. 3689 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3690 3691 if (!Previous.isSingleResult()) 3692 return; 3693 3694 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3695 3696 // If there was a previous declaration of this variable, it may be 3697 // in our identifier chain. Update the identifier chain with the new 3698 // declaration. 3699 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3700 // The previous declaration was found on the identifer resolver 3701 // chain, so remove it from its scope. 3702 3703 if (S->isDeclScope(PrevDecl)) { 3704 // Special case for redeclarations in the SAME scope. 3705 // Because this declaration is going to be added to the identifier chain 3706 // later, we should temporarily take it OFF the chain. 3707 IdResolver.RemoveDecl(ND); 3708 3709 } else { 3710 // Find the scope for the original declaration. 3711 while (S && !S->isDeclScope(PrevDecl)) 3712 S = S->getParent(); 3713 } 3714 3715 if (S) 3716 S->RemoveDecl(PrevDecl); 3717 } 3718} 3719 3720llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3721Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3722 if (ExternalSource) { 3723 // Load locally-scoped external decls from the external source. 3724 SmallVector<NamedDecl *, 4> Decls; 3725 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3726 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3727 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3728 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3729 if (Pos == LocallyScopedExternalDecls.end()) 3730 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3731 } 3732 } 3733 3734 return LocallyScopedExternalDecls.find(Name); 3735} 3736 3737/// \brief Diagnose function specifiers on a declaration of an identifier that 3738/// does not identify a function. 3739void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3740 // FIXME: We should probably indicate the identifier in question to avoid 3741 // confusion for constructs like "inline int a(), b;" 3742 if (D.getDeclSpec().isInlineSpecified()) 3743 Diag(D.getDeclSpec().getInlineSpecLoc(), 3744 diag::err_inline_non_function); 3745 3746 if (D.getDeclSpec().isVirtualSpecified()) 3747 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3748 diag::err_virtual_non_function); 3749 3750 if (D.getDeclSpec().isExplicitSpecified()) 3751 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3752 diag::err_explicit_non_function); 3753} 3754 3755NamedDecl* 3756Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3757 TypeSourceInfo *TInfo, LookupResult &Previous) { 3758 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3759 if (D.getCXXScopeSpec().isSet()) { 3760 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3761 << D.getCXXScopeSpec().getRange(); 3762 D.setInvalidType(); 3763 // Pretend we didn't see the scope specifier. 3764 DC = CurContext; 3765 Previous.clear(); 3766 } 3767 3768 if (getLangOpts().CPlusPlus) { 3769 // Check that there are no default arguments (C++ only). 3770 CheckExtraCXXDefaultArguments(D); 3771 } 3772 3773 DiagnoseFunctionSpecifiers(D); 3774 3775 if (D.getDeclSpec().isThreadSpecified()) 3776 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3777 if (D.getDeclSpec().isConstexprSpecified()) 3778 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3779 << 1; 3780 3781 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3782 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3783 << D.getName().getSourceRange(); 3784 return 0; 3785 } 3786 3787 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3788 if (!NewTD) return 0; 3789 3790 // Handle attributes prior to checking for duplicates in MergeVarDecl 3791 ProcessDeclAttributes(S, NewTD, D); 3792 3793 CheckTypedefForVariablyModifiedType(S, NewTD); 3794 3795 bool Redeclaration = D.isRedeclaration(); 3796 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3797 D.setRedeclaration(Redeclaration); 3798 return ND; 3799} 3800 3801void 3802Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3803 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3804 // then it shall have block scope. 3805 // Note that variably modified types must be fixed before merging the decl so 3806 // that redeclarations will match. 3807 QualType T = NewTD->getUnderlyingType(); 3808 if (T->isVariablyModifiedType()) { 3809 getCurFunction()->setHasBranchProtectedScope(); 3810 3811 if (S->getFnParent() == 0) { 3812 bool SizeIsNegative; 3813 llvm::APSInt Oversized; 3814 QualType FixedTy = 3815 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3816 Oversized); 3817 if (!FixedTy.isNull()) { 3818 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3819 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3820 } else { 3821 if (SizeIsNegative) 3822 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3823 else if (T->isVariableArrayType()) 3824 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3825 else if (Oversized.getBoolValue()) 3826 Diag(NewTD->getLocation(), diag::err_array_too_large) 3827 << Oversized.toString(10); 3828 else 3829 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3830 NewTD->setInvalidDecl(); 3831 } 3832 } 3833 } 3834} 3835 3836 3837/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3838/// declares a typedef-name, either using the 'typedef' type specifier or via 3839/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3840NamedDecl* 3841Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3842 LookupResult &Previous, bool &Redeclaration) { 3843 // Merge the decl with the existing one if appropriate. If the decl is 3844 // in an outer scope, it isn't the same thing. 3845 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3846 /*ExplicitInstantiationOrSpecialization=*/false); 3847 if (!Previous.empty()) { 3848 Redeclaration = true; 3849 MergeTypedefNameDecl(NewTD, Previous); 3850 } 3851 3852 // If this is the C FILE type, notify the AST context. 3853 if (IdentifierInfo *II = NewTD->getIdentifier()) 3854 if (!NewTD->isInvalidDecl() && 3855 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3856 if (II->isStr("FILE")) 3857 Context.setFILEDecl(NewTD); 3858 else if (II->isStr("jmp_buf")) 3859 Context.setjmp_bufDecl(NewTD); 3860 else if (II->isStr("sigjmp_buf")) 3861 Context.setsigjmp_bufDecl(NewTD); 3862 else if (II->isStr("ucontext_t")) 3863 Context.setucontext_tDecl(NewTD); 3864 else if (II->isStr("__builtin_va_list")) 3865 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3866 } 3867 3868 return NewTD; 3869} 3870 3871/// \brief Determines whether the given declaration is an out-of-scope 3872/// previous declaration. 3873/// 3874/// This routine should be invoked when name lookup has found a 3875/// previous declaration (PrevDecl) that is not in the scope where a 3876/// new declaration by the same name is being introduced. If the new 3877/// declaration occurs in a local scope, previous declarations with 3878/// linkage may still be considered previous declarations (C99 3879/// 6.2.2p4-5, C++ [basic.link]p6). 3880/// 3881/// \param PrevDecl the previous declaration found by name 3882/// lookup 3883/// 3884/// \param DC the context in which the new declaration is being 3885/// declared. 3886/// 3887/// \returns true if PrevDecl is an out-of-scope previous declaration 3888/// for a new delcaration with the same name. 3889static bool 3890isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3891 ASTContext &Context) { 3892 if (!PrevDecl) 3893 return false; 3894 3895 if (!PrevDecl->hasLinkage()) 3896 return false; 3897 3898 if (Context.getLangOpts().CPlusPlus) { 3899 // C++ [basic.link]p6: 3900 // If there is a visible declaration of an entity with linkage 3901 // having the same name and type, ignoring entities declared 3902 // outside the innermost enclosing namespace scope, the block 3903 // scope declaration declares that same entity and receives the 3904 // linkage of the previous declaration. 3905 DeclContext *OuterContext = DC->getRedeclContext(); 3906 if (!OuterContext->isFunctionOrMethod()) 3907 // This rule only applies to block-scope declarations. 3908 return false; 3909 3910 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3911 if (PrevOuterContext->isRecord()) 3912 // We found a member function: ignore it. 3913 return false; 3914 3915 // Find the innermost enclosing namespace for the new and 3916 // previous declarations. 3917 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3918 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3919 3920 // The previous declaration is in a different namespace, so it 3921 // isn't the same function. 3922 if (!OuterContext->Equals(PrevOuterContext)) 3923 return false; 3924 } 3925 3926 return true; 3927} 3928 3929static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3930 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3931 if (!SS.isSet()) return; 3932 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3933} 3934 3935bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3936 QualType type = decl->getType(); 3937 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3938 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3939 // Various kinds of declaration aren't allowed to be __autoreleasing. 3940 unsigned kind = -1U; 3941 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3942 if (var->hasAttr<BlocksAttr>()) 3943 kind = 0; // __block 3944 else if (!var->hasLocalStorage()) 3945 kind = 1; // global 3946 } else if (isa<ObjCIvarDecl>(decl)) { 3947 kind = 3; // ivar 3948 } else if (isa<FieldDecl>(decl)) { 3949 kind = 2; // field 3950 } 3951 3952 if (kind != -1U) { 3953 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3954 << kind; 3955 } 3956 } else if (lifetime == Qualifiers::OCL_None) { 3957 // Try to infer lifetime. 3958 if (!type->isObjCLifetimeType()) 3959 return false; 3960 3961 lifetime = type->getObjCARCImplicitLifetime(); 3962 type = Context.getLifetimeQualifiedType(type, lifetime); 3963 decl->setType(type); 3964 } 3965 3966 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3967 // Thread-local variables cannot have lifetime. 3968 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3969 var->isThreadSpecified()) { 3970 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3971 << var->getType(); 3972 return true; 3973 } 3974 } 3975 3976 return false; 3977} 3978 3979NamedDecl* 3980Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3981 TypeSourceInfo *TInfo, LookupResult &Previous, 3982 MultiTemplateParamsArg TemplateParamLists) { 3983 QualType R = TInfo->getType(); 3984 DeclarationName Name = GetNameForDeclarator(D).getName(); 3985 3986 // Check that there are no default arguments (C++ only). 3987 if (getLangOpts().CPlusPlus) 3988 CheckExtraCXXDefaultArguments(D); 3989 3990 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3991 assert(SCSpec != DeclSpec::SCS_typedef && 3992 "Parser allowed 'typedef' as storage class VarDecl."); 3993 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3994 if (SCSpec == DeclSpec::SCS_mutable) { 3995 // mutable can only appear on non-static class members, so it's always 3996 // an error here 3997 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3998 D.setInvalidType(); 3999 SC = SC_None; 4000 } 4001 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4002 VarDecl::StorageClass SCAsWritten 4003 = StorageClassSpecToVarDeclStorageClass(SCSpec); 4004 4005 IdentifierInfo *II = Name.getAsIdentifierInfo(); 4006 if (!II) { 4007 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 4008 << Name; 4009 return 0; 4010 } 4011 4012 DiagnoseFunctionSpecifiers(D); 4013 4014 if (!DC->isRecord() && S->getFnParent() == 0) { 4015 // C99 6.9p2: The storage-class specifiers auto and register shall not 4016 // appear in the declaration specifiers in an external declaration. 4017 if (SC == SC_Auto || SC == SC_Register) { 4018 4019 // If this is a register variable with an asm label specified, then this 4020 // is a GNU extension. 4021 if (SC == SC_Register && D.getAsmLabel()) 4022 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 4023 else 4024 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 4025 D.setInvalidType(); 4026 } 4027 } 4028 4029 if (getLangOpts().OpenCL) { 4030 // Set up the special work-group-local storage class for variables in the 4031 // OpenCL __local address space. 4032 if (R.getAddressSpace() == LangAS::opencl_local) 4033 SC = SC_OpenCLWorkGroupLocal; 4034 } 4035 4036 bool isExplicitSpecialization = false; 4037 VarDecl *NewVD; 4038 if (!getLangOpts().CPlusPlus) { 4039 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4040 D.getIdentifierLoc(), II, 4041 R, TInfo, SC, SCAsWritten); 4042 4043 if (D.isInvalidType()) 4044 NewVD->setInvalidDecl(); 4045 } else { 4046 if (DC->isRecord() && !CurContext->isRecord()) { 4047 // This is an out-of-line definition of a static data member. 4048 if (SC == SC_Static) { 4049 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4050 diag::err_static_out_of_line) 4051 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4052 } else if (SC == SC_None) 4053 SC = SC_Static; 4054 } 4055 if (SC == SC_Static && CurContext->isRecord()) { 4056 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 4057 if (RD->isLocalClass()) 4058 Diag(D.getIdentifierLoc(), 4059 diag::err_static_data_member_not_allowed_in_local_class) 4060 << Name << RD->getDeclName(); 4061 4062 // C++98 [class.union]p1: If a union contains a static data member, 4063 // the program is ill-formed. C++11 drops this restriction. 4064 if (RD->isUnion()) 4065 Diag(D.getIdentifierLoc(), 4066 getLangOpts().CPlusPlus0x 4067 ? diag::warn_cxx98_compat_static_data_member_in_union 4068 : diag::ext_static_data_member_in_union) << Name; 4069 // We conservatively disallow static data members in anonymous structs. 4070 else if (!RD->getDeclName()) 4071 Diag(D.getIdentifierLoc(), 4072 diag::err_static_data_member_not_allowed_in_anon_struct) 4073 << Name << RD->isUnion(); 4074 } 4075 } 4076 4077 // Match up the template parameter lists with the scope specifier, then 4078 // determine whether we have a template or a template specialization. 4079 isExplicitSpecialization = false; 4080 bool Invalid = false; 4081 if (TemplateParameterList *TemplateParams 4082 = MatchTemplateParametersToScopeSpecifier( 4083 D.getDeclSpec().getLocStart(), 4084 D.getIdentifierLoc(), 4085 D.getCXXScopeSpec(), 4086 TemplateParamLists.get(), 4087 TemplateParamLists.size(), 4088 /*never a friend*/ false, 4089 isExplicitSpecialization, 4090 Invalid)) { 4091 if (TemplateParams->size() > 0) { 4092 // There is no such thing as a variable template. 4093 Diag(D.getIdentifierLoc(), diag::err_template_variable) 4094 << II 4095 << SourceRange(TemplateParams->getTemplateLoc(), 4096 TemplateParams->getRAngleLoc()); 4097 return 0; 4098 } else { 4099 // There is an extraneous 'template<>' for this variable. Complain 4100 // about it, but allow the declaration of the variable. 4101 Diag(TemplateParams->getTemplateLoc(), 4102 diag::err_template_variable_noparams) 4103 << II 4104 << SourceRange(TemplateParams->getTemplateLoc(), 4105 TemplateParams->getRAngleLoc()); 4106 } 4107 } 4108 4109 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4110 D.getIdentifierLoc(), II, 4111 R, TInfo, SC, SCAsWritten); 4112 4113 // If this decl has an auto type in need of deduction, make a note of the 4114 // Decl so we can diagnose uses of it in its own initializer. 4115 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 4116 R->getContainedAutoType()) 4117 ParsingInitForAutoVars.insert(NewVD); 4118 4119 if (D.isInvalidType() || Invalid) 4120 NewVD->setInvalidDecl(); 4121 4122 SetNestedNameSpecifier(NewVD, D); 4123 4124 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 4125 NewVD->setTemplateParameterListsInfo(Context, 4126 TemplateParamLists.size(), 4127 TemplateParamLists.release()); 4128 } 4129 4130 if (D.getDeclSpec().isConstexprSpecified()) 4131 NewVD->setConstexpr(true); 4132 } 4133 4134 // Set the lexical context. If the declarator has a C++ scope specifier, the 4135 // lexical context will be different from the semantic context. 4136 NewVD->setLexicalDeclContext(CurContext); 4137 4138 if (D.getDeclSpec().isThreadSpecified()) { 4139 if (NewVD->hasLocalStorage()) 4140 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4141 else if (!Context.getTargetInfo().isTLSSupported()) 4142 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4143 else 4144 NewVD->setThreadSpecified(true); 4145 } 4146 4147 if (D.getDeclSpec().isModulePrivateSpecified()) { 4148 if (isExplicitSpecialization) 4149 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4150 << 2 4151 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4152 else if (NewVD->hasLocalStorage()) 4153 Diag(NewVD->getLocation(), diag::err_module_private_local) 4154 << 0 << NewVD->getDeclName() 4155 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4156 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4157 else 4158 NewVD->setModulePrivate(); 4159 } 4160 4161 // Handle attributes prior to checking for duplicates in MergeVarDecl 4162 ProcessDeclAttributes(S, NewVD, D); 4163 4164 // In auto-retain/release, infer strong retension for variables of 4165 // retainable type. 4166 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4167 NewVD->setInvalidDecl(); 4168 4169 // Handle GNU asm-label extension (encoded as an attribute). 4170 if (Expr *E = (Expr*)D.getAsmLabel()) { 4171 // The parser guarantees this is a string. 4172 StringLiteral *SE = cast<StringLiteral>(E); 4173 StringRef Label = SE->getString(); 4174 if (S->getFnParent() != 0) { 4175 switch (SC) { 4176 case SC_None: 4177 case SC_Auto: 4178 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4179 break; 4180 case SC_Register: 4181 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4182 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4183 break; 4184 case SC_Static: 4185 case SC_Extern: 4186 case SC_PrivateExtern: 4187 case SC_OpenCLWorkGroupLocal: 4188 break; 4189 } 4190 } 4191 4192 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4193 Context, Label)); 4194 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 4195 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 4196 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier()); 4197 if (I != ExtnameUndeclaredIdentifiers.end()) { 4198 NewVD->addAttr(I->second); 4199 ExtnameUndeclaredIdentifiers.erase(I); 4200 } 4201 } 4202 4203 // Diagnose shadowed variables before filtering for scope. 4204 if (!D.getCXXScopeSpec().isSet()) 4205 CheckShadow(S, NewVD, Previous); 4206 4207 // Don't consider existing declarations that are in a different 4208 // scope and are out-of-semantic-context declarations (if the new 4209 // declaration has linkage). 4210 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4211 isExplicitSpecialization); 4212 4213 if (!getLangOpts().CPlusPlus) { 4214 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4215 } else { 4216 // Merge the decl with the existing one if appropriate. 4217 if (!Previous.empty()) { 4218 if (Previous.isSingleResult() && 4219 isa<FieldDecl>(Previous.getFoundDecl()) && 4220 D.getCXXScopeSpec().isSet()) { 4221 // The user tried to define a non-static data member 4222 // out-of-line (C++ [dcl.meaning]p1). 4223 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4224 << D.getCXXScopeSpec().getRange(); 4225 Previous.clear(); 4226 NewVD->setInvalidDecl(); 4227 } 4228 } else if (D.getCXXScopeSpec().isSet()) { 4229 // No previous declaration in the qualifying scope. 4230 Diag(D.getIdentifierLoc(), diag::err_no_member) 4231 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4232 << D.getCXXScopeSpec().getRange(); 4233 NewVD->setInvalidDecl(); 4234 } 4235 4236 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4237 4238 // This is an explicit specialization of a static data member. Check it. 4239 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4240 CheckMemberSpecialization(NewVD, Previous)) 4241 NewVD->setInvalidDecl(); 4242 } 4243 4244 // attributes declared post-definition are currently ignored 4245 // FIXME: This should be handled in attribute merging, not 4246 // here. 4247 if (Previous.isSingleResult()) { 4248 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4249 if (Def && (Def = Def->getDefinition()) && 4250 Def != NewVD && D.hasAttributes()) { 4251 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4252 Diag(Def->getLocation(), diag::note_previous_definition); 4253 } 4254 } 4255 4256 // If this is a locally-scoped extern C variable, update the map of 4257 // such variables. 4258 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4259 !NewVD->isInvalidDecl()) 4260 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4261 4262 // If there's a #pragma GCC visibility in scope, and this isn't a class 4263 // member, set the visibility of this variable. 4264 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4265 AddPushedVisibilityAttribute(NewVD); 4266 4267 MarkUnusedFileScopedDecl(NewVD); 4268 4269 return NewVD; 4270} 4271 4272/// \brief Diagnose variable or built-in function shadowing. Implements 4273/// -Wshadow. 4274/// 4275/// This method is called whenever a VarDecl is added to a "useful" 4276/// scope. 4277/// 4278/// \param S the scope in which the shadowing name is being declared 4279/// \param R the lookup of the name 4280/// 4281void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4282 // Return if warning is ignored. 4283 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4284 DiagnosticsEngine::Ignored) 4285 return; 4286 4287 // Don't diagnose declarations at file scope. 4288 if (D->hasGlobalStorage()) 4289 return; 4290 4291 DeclContext *NewDC = D->getDeclContext(); 4292 4293 // Only diagnose if we're shadowing an unambiguous field or variable. 4294 if (R.getResultKind() != LookupResult::Found) 4295 return; 4296 4297 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4298 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4299 return; 4300 4301 // Fields are not shadowed by variables in C++ static methods. 4302 if (isa<FieldDecl>(ShadowedDecl)) 4303 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4304 if (MD->isStatic()) 4305 return; 4306 4307 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4308 if (shadowedVar->isExternC()) { 4309 // For shadowing external vars, make sure that we point to the global 4310 // declaration, not a locally scoped extern declaration. 4311 for (VarDecl::redecl_iterator 4312 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4313 I != E; ++I) 4314 if (I->isFileVarDecl()) { 4315 ShadowedDecl = *I; 4316 break; 4317 } 4318 } 4319 4320 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4321 4322 // Only warn about certain kinds of shadowing for class members. 4323 if (NewDC && NewDC->isRecord()) { 4324 // In particular, don't warn about shadowing non-class members. 4325 if (!OldDC->isRecord()) 4326 return; 4327 4328 // TODO: should we warn about static data members shadowing 4329 // static data members from base classes? 4330 4331 // TODO: don't diagnose for inaccessible shadowed members. 4332 // This is hard to do perfectly because we might friend the 4333 // shadowing context, but that's just a false negative. 4334 } 4335 4336 // Determine what kind of declaration we're shadowing. 4337 unsigned Kind; 4338 if (isa<RecordDecl>(OldDC)) { 4339 if (isa<FieldDecl>(ShadowedDecl)) 4340 Kind = 3; // field 4341 else 4342 Kind = 2; // static data member 4343 } else if (OldDC->isFileContext()) 4344 Kind = 1; // global 4345 else 4346 Kind = 0; // local 4347 4348 DeclarationName Name = R.getLookupName(); 4349 4350 // Emit warning and note. 4351 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4352 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4353} 4354 4355/// \brief Check -Wshadow without the advantage of a previous lookup. 4356void Sema::CheckShadow(Scope *S, VarDecl *D) { 4357 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4358 DiagnosticsEngine::Ignored) 4359 return; 4360 4361 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4362 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4363 LookupName(R, S); 4364 CheckShadow(S, D, R); 4365} 4366 4367/// \brief Perform semantic checking on a newly-created variable 4368/// declaration. 4369/// 4370/// This routine performs all of the type-checking required for a 4371/// variable declaration once it has been built. It is used both to 4372/// check variables after they have been parsed and their declarators 4373/// have been translated into a declaration, and to check variables 4374/// that have been instantiated from a template. 4375/// 4376/// Sets NewVD->isInvalidDecl() if an error was encountered. 4377/// 4378/// Returns true if the variable declaration is a redeclaration. 4379bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4380 LookupResult &Previous) { 4381 // If the decl is already known invalid, don't check it. 4382 if (NewVD->isInvalidDecl()) 4383 return false; 4384 4385 QualType T = NewVD->getType(); 4386 4387 if (T->isObjCObjectType()) { 4388 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4389 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4390 T = Context.getObjCObjectPointerType(T); 4391 NewVD->setType(T); 4392 } 4393 4394 // Emit an error if an address space was applied to decl with local storage. 4395 // This includes arrays of objects with address space qualifiers, but not 4396 // automatic variables that point to other address spaces. 4397 // ISO/IEC TR 18037 S5.1.2 4398 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4399 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4400 NewVD->setInvalidDecl(); 4401 return false; 4402 } 4403 4404 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4405 && !NewVD->hasAttr<BlocksAttr>()) { 4406 if (getLangOpts().getGC() != LangOptions::NonGC) 4407 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4408 else 4409 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4410 } 4411 4412 bool isVM = T->isVariablyModifiedType(); 4413 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4414 NewVD->hasAttr<BlocksAttr>()) 4415 getCurFunction()->setHasBranchProtectedScope(); 4416 4417 if ((isVM && NewVD->hasLinkage()) || 4418 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4419 bool SizeIsNegative; 4420 llvm::APSInt Oversized; 4421 QualType FixedTy = 4422 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4423 Oversized); 4424 4425 if (FixedTy.isNull() && T->isVariableArrayType()) { 4426 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4427 // FIXME: This won't give the correct result for 4428 // int a[10][n]; 4429 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4430 4431 if (NewVD->isFileVarDecl()) 4432 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4433 << SizeRange; 4434 else if (NewVD->getStorageClass() == SC_Static) 4435 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4436 << SizeRange; 4437 else 4438 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4439 << SizeRange; 4440 NewVD->setInvalidDecl(); 4441 return false; 4442 } 4443 4444 if (FixedTy.isNull()) { 4445 if (NewVD->isFileVarDecl()) 4446 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4447 else 4448 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4449 NewVD->setInvalidDecl(); 4450 return false; 4451 } 4452 4453 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4454 NewVD->setType(FixedTy); 4455 } 4456 4457 if (Previous.empty() && NewVD->isExternC()) { 4458 // Since we did not find anything by this name and we're declaring 4459 // an extern "C" variable, look for a non-visible extern "C" 4460 // declaration with the same name. 4461 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4462 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4463 if (Pos != LocallyScopedExternalDecls.end()) 4464 Previous.addDecl(Pos->second); 4465 } 4466 4467 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4468 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4469 << T; 4470 NewVD->setInvalidDecl(); 4471 return false; 4472 } 4473 4474 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4475 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4476 NewVD->setInvalidDecl(); 4477 return false; 4478 } 4479 4480 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4481 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4482 NewVD->setInvalidDecl(); 4483 return false; 4484 } 4485 4486 if (NewVD->isConstexpr() && !T->isDependentType() && 4487 RequireLiteralType(NewVD->getLocation(), T, 4488 diag::err_constexpr_var_non_literal)) { 4489 NewVD->setInvalidDecl(); 4490 return false; 4491 } 4492 4493 if (!Previous.empty()) { 4494 MergeVarDecl(NewVD, Previous); 4495 return true; 4496 } 4497 return false; 4498} 4499 4500/// \brief Data used with FindOverriddenMethod 4501struct FindOverriddenMethodData { 4502 Sema *S; 4503 CXXMethodDecl *Method; 4504}; 4505 4506/// \brief Member lookup function that determines whether a given C++ 4507/// method overrides a method in a base class, to be used with 4508/// CXXRecordDecl::lookupInBases(). 4509static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4510 CXXBasePath &Path, 4511 void *UserData) { 4512 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4513 4514 FindOverriddenMethodData *Data 4515 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4516 4517 DeclarationName Name = Data->Method->getDeclName(); 4518 4519 // FIXME: Do we care about other names here too? 4520 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4521 // We really want to find the base class destructor here. 4522 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4523 CanQualType CT = Data->S->Context.getCanonicalType(T); 4524 4525 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4526 } 4527 4528 for (Path.Decls = BaseRecord->lookup(Name); 4529 Path.Decls.first != Path.Decls.second; 4530 ++Path.Decls.first) { 4531 NamedDecl *D = *Path.Decls.first; 4532 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4533 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4534 return true; 4535 } 4536 } 4537 4538 return false; 4539} 4540 4541static bool hasDelayedExceptionSpec(CXXMethodDecl *Method) { 4542 const FunctionProtoType *Proto =Method->getType()->getAs<FunctionProtoType>(); 4543 return Proto && Proto->getExceptionSpecType() == EST_Delayed; 4544} 4545 4546/// AddOverriddenMethods - See if a method overrides any in the base classes, 4547/// and if so, check that it's a valid override and remember it. 4548bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4549 // Look for virtual methods in base classes that this method might override. 4550 CXXBasePaths Paths; 4551 FindOverriddenMethodData Data; 4552 Data.Method = MD; 4553 Data.S = this; 4554 bool AddedAny = false; 4555 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4556 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4557 E = Paths.found_decls_end(); I != E; ++I) { 4558 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4559 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4560 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4561 (hasDelayedExceptionSpec(MD) || 4562 !CheckOverridingFunctionExceptionSpec(MD, OldMD)) && 4563 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4564 AddedAny = true; 4565 } 4566 } 4567 } 4568 } 4569 4570 return AddedAny; 4571} 4572 4573namespace { 4574 // Struct for holding all of the extra arguments needed by 4575 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4576 struct ActOnFDArgs { 4577 Scope *S; 4578 Declarator &D; 4579 MultiTemplateParamsArg TemplateParamLists; 4580 bool AddToScope; 4581 }; 4582} 4583 4584namespace { 4585 4586// Callback to only accept typo corrections that have a non-zero edit distance. 4587// Also only accept corrections that have the same parent decl. 4588class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4589 public: 4590 DifferentNameValidatorCCC(CXXRecordDecl *Parent) 4591 : ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {} 4592 4593 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4594 if (candidate.getEditDistance() == 0) 4595 return false; 4596 4597 if (CXXMethodDecl *MD = candidate.getCorrectionDeclAs<CXXMethodDecl>()) { 4598 CXXRecordDecl *Parent = MD->getParent(); 4599 return Parent && Parent->getCanonicalDecl() == ExpectedParent; 4600 } 4601 4602 return !ExpectedParent; 4603 } 4604 4605 private: 4606 CXXRecordDecl *ExpectedParent; 4607}; 4608 4609} 4610 4611/// \brief Generate diagnostics for an invalid function redeclaration. 4612/// 4613/// This routine handles generating the diagnostic messages for an invalid 4614/// function redeclaration, including finding possible similar declarations 4615/// or performing typo correction if there are no previous declarations with 4616/// the same name. 4617/// 4618/// Returns a NamedDecl iff typo correction was performed and substituting in 4619/// the new declaration name does not cause new errors. 4620static NamedDecl* DiagnoseInvalidRedeclaration( 4621 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4622 ActOnFDArgs &ExtraArgs) { 4623 NamedDecl *Result = NULL; 4624 DeclarationName Name = NewFD->getDeclName(); 4625 DeclContext *NewDC = NewFD->getDeclContext(); 4626 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4627 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4628 llvm::SmallVector<unsigned, 1> MismatchedParams; 4629 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4630 TypoCorrection Correction; 4631 bool isFriendDecl = (SemaRef.getLangOpts().CPlusPlus && 4632 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4633 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4634 : diag::err_member_def_does_not_match; 4635 4636 NewFD->setInvalidDecl(); 4637 SemaRef.LookupQualifiedName(Prev, NewDC); 4638 assert(!Prev.isAmbiguous() && 4639 "Cannot have an ambiguity in previous-declaration lookup"); 4640 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 4641 DifferentNameValidatorCCC Validator(MD ? MD->getParent() : 0); 4642 if (!Prev.empty()) { 4643 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4644 Func != FuncEnd; ++Func) { 4645 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4646 if (FD && 4647 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4648 // Add 1 to the index so that 0 can mean the mismatch didn't 4649 // involve a parameter 4650 unsigned ParamNum = 4651 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4652 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4653 } 4654 } 4655 // If the qualified name lookup yielded nothing, try typo correction 4656 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4657 Prev.getLookupKind(), 0, 0, 4658 Validator, NewDC))) { 4659 // Trap errors. 4660 Sema::SFINAETrap Trap(SemaRef); 4661 4662 // Set up everything for the call to ActOnFunctionDeclarator 4663 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4664 ExtraArgs.D.getIdentifierLoc()); 4665 Previous.clear(); 4666 Previous.setLookupName(Correction.getCorrection()); 4667 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4668 CDeclEnd = Correction.end(); 4669 CDecl != CDeclEnd; ++CDecl) { 4670 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4671 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4672 MismatchedParams)) { 4673 Previous.addDecl(FD); 4674 } 4675 } 4676 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4677 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4678 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4679 // eliminate the need for the parameter pack ExtraArgs. 4680 Result = SemaRef.ActOnFunctionDeclarator( 4681 ExtraArgs.S, ExtraArgs.D, 4682 Correction.getCorrectionDecl()->getDeclContext(), 4683 NewFD->getTypeSourceInfo(), Previous, ExtraArgs.TemplateParamLists, 4684 ExtraArgs.AddToScope); 4685 if (Trap.hasErrorOccurred()) { 4686 // Pretend the typo correction never occurred 4687 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4688 ExtraArgs.D.getIdentifierLoc()); 4689 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4690 Previous.clear(); 4691 Previous.setLookupName(Name); 4692 Result = NULL; 4693 } else { 4694 for (LookupResult::iterator Func = Previous.begin(), 4695 FuncEnd = Previous.end(); 4696 Func != FuncEnd; ++Func) { 4697 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4698 NearMatches.push_back(std::make_pair(FD, 0)); 4699 } 4700 } 4701 if (NearMatches.empty()) { 4702 // Ignore the correction if it didn't yield any close FunctionDecl matches 4703 Correction = TypoCorrection(); 4704 } else { 4705 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4706 : diag::err_member_def_does_not_match_suggest; 4707 } 4708 } 4709 4710 if (Correction) 4711 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4712 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOpts()) 4713 << FixItHint::CreateReplacement( 4714 NewFD->getLocation(), 4715 Correction.getAsString(SemaRef.getLangOpts())); 4716 else 4717 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4718 << Name << NewDC << NewFD->getLocation(); 4719 4720 bool NewFDisConst = false; 4721 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4722 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4723 4724 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4725 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4726 NearMatch != NearMatchEnd; ++NearMatch) { 4727 FunctionDecl *FD = NearMatch->first; 4728 bool FDisConst = false; 4729 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4730 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4731 4732 if (unsigned Idx = NearMatch->second) { 4733 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4734 SourceLocation Loc = FDParam->getTypeSpecStartLoc(); 4735 if (Loc.isInvalid()) Loc = FD->getLocation(); 4736 SemaRef.Diag(Loc, diag::note_member_def_close_param_match) 4737 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4738 } else if (Correction) { 4739 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4740 << Correction.getQuoted(SemaRef.getLangOpts()); 4741 } else if (FDisConst != NewFDisConst) { 4742 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4743 << NewFDisConst << FD->getSourceRange().getEnd(); 4744 } else 4745 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4746 } 4747 return Result; 4748} 4749 4750static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4751 Declarator &D) { 4752 switch (D.getDeclSpec().getStorageClassSpec()) { 4753 default: llvm_unreachable("Unknown storage class!"); 4754 case DeclSpec::SCS_auto: 4755 case DeclSpec::SCS_register: 4756 case DeclSpec::SCS_mutable: 4757 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4758 diag::err_typecheck_sclass_func); 4759 D.setInvalidType(); 4760 break; 4761 case DeclSpec::SCS_unspecified: break; 4762 case DeclSpec::SCS_extern: return SC_Extern; 4763 case DeclSpec::SCS_static: { 4764 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4765 // C99 6.7.1p5: 4766 // The declaration of an identifier for a function that has 4767 // block scope shall have no explicit storage-class specifier 4768 // other than extern 4769 // See also (C++ [dcl.stc]p4). 4770 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4771 diag::err_static_block_func); 4772 break; 4773 } else 4774 return SC_Static; 4775 } 4776 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4777 } 4778 4779 // No explicit storage class has already been returned 4780 return SC_None; 4781} 4782 4783static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4784 DeclContext *DC, QualType &R, 4785 TypeSourceInfo *TInfo, 4786 FunctionDecl::StorageClass SC, 4787 bool &IsVirtualOkay) { 4788 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4789 DeclarationName Name = NameInfo.getName(); 4790 4791 FunctionDecl *NewFD = 0; 4792 bool isInline = D.getDeclSpec().isInlineSpecified(); 4793 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4794 FunctionDecl::StorageClass SCAsWritten 4795 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4796 4797 if (!SemaRef.getLangOpts().CPlusPlus) { 4798 // Determine whether the function was written with a 4799 // prototype. This true when: 4800 // - there is a prototype in the declarator, or 4801 // - the type R of the function is some kind of typedef or other reference 4802 // to a type name (which eventually refers to a function type). 4803 bool HasPrototype = 4804 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4805 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4806 4807 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4808 D.getLocStart(), NameInfo, R, 4809 TInfo, SC, SCAsWritten, isInline, 4810 HasPrototype); 4811 if (D.isInvalidType()) 4812 NewFD->setInvalidDecl(); 4813 4814 // Set the lexical context. 4815 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4816 4817 return NewFD; 4818 } 4819 4820 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4821 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4822 4823 // Check that the return type is not an abstract class type. 4824 // For record types, this is done by the AbstractClassUsageDiagnoser once 4825 // the class has been completely parsed. 4826 if (!DC->isRecord() && 4827 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4828 R->getAs<FunctionType>()->getResultType(), 4829 diag::err_abstract_type_in_decl, 4830 SemaRef.AbstractReturnType)) 4831 D.setInvalidType(); 4832 4833 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4834 // This is a C++ constructor declaration. 4835 assert(DC->isRecord() && 4836 "Constructors can only be declared in a member context"); 4837 4838 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4839 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4840 D.getLocStart(), NameInfo, 4841 R, TInfo, isExplicit, isInline, 4842 /*isImplicitlyDeclared=*/false, 4843 isConstexpr); 4844 4845 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4846 // This is a C++ destructor declaration. 4847 if (DC->isRecord()) { 4848 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4849 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4850 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4851 SemaRef.Context, Record, 4852 D.getLocStart(), 4853 NameInfo, R, TInfo, isInline, 4854 /*isImplicitlyDeclared=*/false); 4855 4856 // If the class is complete, then we now create the implicit exception 4857 // specification. If the class is incomplete or dependent, we can't do 4858 // it yet. 4859 if (SemaRef.getLangOpts().CPlusPlus0x && !Record->isDependentType() && 4860 Record->getDefinition() && !Record->isBeingDefined() && 4861 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4862 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4863 } 4864 4865 IsVirtualOkay = true; 4866 return NewDD; 4867 4868 } else { 4869 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4870 D.setInvalidType(); 4871 4872 // Create a FunctionDecl to satisfy the function definition parsing 4873 // code path. 4874 return FunctionDecl::Create(SemaRef.Context, DC, 4875 D.getLocStart(), 4876 D.getIdentifierLoc(), Name, R, TInfo, 4877 SC, SCAsWritten, isInline, 4878 /*hasPrototype=*/true, isConstexpr); 4879 } 4880 4881 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4882 if (!DC->isRecord()) { 4883 SemaRef.Diag(D.getIdentifierLoc(), 4884 diag::err_conv_function_not_member); 4885 return 0; 4886 } 4887 4888 SemaRef.CheckConversionDeclarator(D, R, SC); 4889 IsVirtualOkay = true; 4890 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4891 D.getLocStart(), NameInfo, 4892 R, TInfo, isInline, isExplicit, 4893 isConstexpr, SourceLocation()); 4894 4895 } else if (DC->isRecord()) { 4896 // If the name of the function is the same as the name of the record, 4897 // then this must be an invalid constructor that has a return type. 4898 // (The parser checks for a return type and makes the declarator a 4899 // constructor if it has no return type). 4900 if (Name.getAsIdentifierInfo() && 4901 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4902 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4903 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4904 << SourceRange(D.getIdentifierLoc()); 4905 return 0; 4906 } 4907 4908 bool isStatic = SC == SC_Static; 4909 4910 // [class.free]p1: 4911 // Any allocation function for a class T is a static member 4912 // (even if not explicitly declared static). 4913 if (Name.getCXXOverloadedOperator() == OO_New || 4914 Name.getCXXOverloadedOperator() == OO_Array_New) 4915 isStatic = true; 4916 4917 // [class.free]p6 Any deallocation function for a class X is a static member 4918 // (even if not explicitly declared static). 4919 if (Name.getCXXOverloadedOperator() == OO_Delete || 4920 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4921 isStatic = true; 4922 4923 IsVirtualOkay = !isStatic; 4924 4925 // This is a C++ method declaration. 4926 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4927 D.getLocStart(), NameInfo, R, 4928 TInfo, isStatic, SCAsWritten, isInline, 4929 isConstexpr, SourceLocation()); 4930 4931 } else { 4932 // Determine whether the function was written with a 4933 // prototype. This true when: 4934 // - we're in C++ (where every function has a prototype), 4935 return FunctionDecl::Create(SemaRef.Context, DC, 4936 D.getLocStart(), 4937 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4938 true/*HasPrototype*/, isConstexpr); 4939 } 4940} 4941 4942NamedDecl* 4943Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4944 TypeSourceInfo *TInfo, LookupResult &Previous, 4945 MultiTemplateParamsArg TemplateParamLists, 4946 bool &AddToScope) { 4947 QualType R = TInfo->getType(); 4948 4949 assert(R.getTypePtr()->isFunctionType()); 4950 4951 // TODO: consider using NameInfo for diagnostic. 4952 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4953 DeclarationName Name = NameInfo.getName(); 4954 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4955 4956 if (D.getDeclSpec().isThreadSpecified()) 4957 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4958 4959 // Do not allow returning a objc interface by-value. 4960 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4961 Diag(D.getIdentifierLoc(), 4962 diag::err_object_cannot_be_passed_returned_by_value) << 0 4963 << R->getAs<FunctionType>()->getResultType() 4964 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4965 4966 QualType T = R->getAs<FunctionType>()->getResultType(); 4967 T = Context.getObjCObjectPointerType(T); 4968 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4969 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4970 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4971 FPT->getNumArgs(), EPI); 4972 } 4973 else if (isa<FunctionNoProtoType>(R)) 4974 R = Context.getFunctionNoProtoType(T); 4975 } 4976 4977 bool isFriend = false; 4978 FunctionTemplateDecl *FunctionTemplate = 0; 4979 bool isExplicitSpecialization = false; 4980 bool isFunctionTemplateSpecialization = false; 4981 bool isDependentClassScopeExplicitSpecialization = false; 4982 bool isVirtualOkay = false; 4983 4984 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4985 isVirtualOkay); 4986 if (!NewFD) return 0; 4987 4988 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4989 NewFD->setTopLevelDeclInObjCContainer(); 4990 4991 if (getLangOpts().CPlusPlus) { 4992 bool isInline = D.getDeclSpec().isInlineSpecified(); 4993 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4994 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4995 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4996 isFriend = D.getDeclSpec().isFriendSpecified(); 4997 if (isFriend && !isInline && D.isFunctionDefinition()) { 4998 // C++ [class.friend]p5 4999 // A function can be defined in a friend declaration of a 5000 // class . . . . Such a function is implicitly inline. 5001 NewFD->setImplicitlyInline(); 5002 } 5003 5004 SetNestedNameSpecifier(NewFD, D); 5005 isExplicitSpecialization = false; 5006 isFunctionTemplateSpecialization = false; 5007 if (D.isInvalidType()) 5008 NewFD->setInvalidDecl(); 5009 5010 // Set the lexical context. If the declarator has a C++ 5011 // scope specifier, or is the object of a friend declaration, the 5012 // lexical context will be different from the semantic context. 5013 NewFD->setLexicalDeclContext(CurContext); 5014 5015 // Match up the template parameter lists with the scope specifier, then 5016 // determine whether we have a template or a template specialization. 5017 bool Invalid = false; 5018 if (TemplateParameterList *TemplateParams 5019 = MatchTemplateParametersToScopeSpecifier( 5020 D.getDeclSpec().getLocStart(), 5021 D.getIdentifierLoc(), 5022 D.getCXXScopeSpec(), 5023 TemplateParamLists.get(), 5024 TemplateParamLists.size(), 5025 isFriend, 5026 isExplicitSpecialization, 5027 Invalid)) { 5028 if (TemplateParams->size() > 0) { 5029 // This is a function template 5030 5031 // Check that we can declare a template here. 5032 if (CheckTemplateDeclScope(S, TemplateParams)) 5033 return 0; 5034 5035 // A destructor cannot be a template. 5036 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 5037 Diag(NewFD->getLocation(), diag::err_destructor_template); 5038 return 0; 5039 } 5040 5041 // If we're adding a template to a dependent context, we may need to 5042 // rebuilding some of the types used within the template parameter list, 5043 // now that we know what the current instantiation is. 5044 if (DC->isDependentContext()) { 5045 ContextRAII SavedContext(*this, DC); 5046 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 5047 Invalid = true; 5048 } 5049 5050 5051 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 5052 NewFD->getLocation(), 5053 Name, TemplateParams, 5054 NewFD); 5055 FunctionTemplate->setLexicalDeclContext(CurContext); 5056 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 5057 5058 // For source fidelity, store the other template param lists. 5059 if (TemplateParamLists.size() > 1) { 5060 NewFD->setTemplateParameterListsInfo(Context, 5061 TemplateParamLists.size() - 1, 5062 TemplateParamLists.release()); 5063 } 5064 } else { 5065 // This is a function template specialization. 5066 isFunctionTemplateSpecialization = true; 5067 // For source fidelity, store all the template param lists. 5068 NewFD->setTemplateParameterListsInfo(Context, 5069 TemplateParamLists.size(), 5070 TemplateParamLists.release()); 5071 5072 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 5073 if (isFriend) { 5074 // We want to remove the "template<>", found here. 5075 SourceRange RemoveRange = TemplateParams->getSourceRange(); 5076 5077 // If we remove the template<> and the name is not a 5078 // template-id, we're actually silently creating a problem: 5079 // the friend declaration will refer to an untemplated decl, 5080 // and clearly the user wants a template specialization. So 5081 // we need to insert '<>' after the name. 5082 SourceLocation InsertLoc; 5083 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 5084 InsertLoc = D.getName().getSourceRange().getEnd(); 5085 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 5086 } 5087 5088 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 5089 << Name << RemoveRange 5090 << FixItHint::CreateRemoval(RemoveRange) 5091 << FixItHint::CreateInsertion(InsertLoc, "<>"); 5092 } 5093 } 5094 } 5095 else { 5096 // All template param lists were matched against the scope specifier: 5097 // this is NOT (an explicit specialization of) a template. 5098 if (TemplateParamLists.size() > 0) 5099 // For source fidelity, store all the template param lists. 5100 NewFD->setTemplateParameterListsInfo(Context, 5101 TemplateParamLists.size(), 5102 TemplateParamLists.release()); 5103 } 5104 5105 if (Invalid) { 5106 NewFD->setInvalidDecl(); 5107 if (FunctionTemplate) 5108 FunctionTemplate->setInvalidDecl(); 5109 } 5110 5111 // If we see "T var();" at block scope, where T is a class type, it is 5112 // probably an attempt to initialize a variable, not a function declaration. 5113 // We don't catch this case earlier, since there is no ambiguity here. 5114 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 5115 CurContext->isFunctionOrMethod() && 5116 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 5117 D.getDeclSpec().getStorageClassSpecAsWritten() 5118 == DeclSpec::SCS_unspecified) { 5119 QualType T = R->getAs<FunctionType>()->getResultType(); 5120 DeclaratorChunk &C = D.getTypeObject(0); 5121 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 5122 !C.Fun.TrailingReturnType && 5123 C.Fun.getExceptionSpecType() == EST_None) { 5124 SourceRange ParenRange(C.Loc, C.EndLoc); 5125 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 5126 5127 // If the declaration looks like: 5128 // T var1, 5129 // f(); 5130 // and name lookup finds a function named 'f', then the ',' was 5131 // probably intended to be a ';'. 5132 if (!D.isFirstDeclarator() && D.getIdentifier()) { 5133 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 5134 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 5135 if (Comma.getFileID() != Name.getFileID() || 5136 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 5137 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 5138 LookupOrdinaryName); 5139 if (LookupName(Result, S)) 5140 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 5141 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 5142 } 5143 } 5144 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 5145 // Empty parens mean value-initialization, and no parens mean default 5146 // initialization. These are equivalent if the default constructor is 5147 // user-provided, or if zero-initialization is a no-op. 5148 if (RD && RD->hasDefinition() && 5149 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 5150 Diag(C.Loc, diag::note_empty_parens_default_ctor) 5151 << FixItHint::CreateRemoval(ParenRange); 5152 else { 5153 std::string Init = getFixItZeroInitializerForType(T); 5154 if (Init.empty() && LangOpts.CPlusPlus0x) 5155 Init = "{}"; 5156 if (!Init.empty()) 5157 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5158 << FixItHint::CreateReplacement(ParenRange, Init); 5159 } 5160 } 5161 } 5162 5163 // C++ [dcl.fct.spec]p5: 5164 // The virtual specifier shall only be used in declarations of 5165 // nonstatic class member functions that appear within a 5166 // member-specification of a class declaration; see 10.3. 5167 // 5168 if (isVirtual && !NewFD->isInvalidDecl()) { 5169 if (!isVirtualOkay) { 5170 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5171 diag::err_virtual_non_function); 5172 } else if (!CurContext->isRecord()) { 5173 // 'virtual' was specified outside of the class. 5174 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5175 diag::err_virtual_out_of_class) 5176 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5177 } else if (NewFD->getDescribedFunctionTemplate()) { 5178 // C++ [temp.mem]p3: 5179 // A member function template shall not be virtual. 5180 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5181 diag::err_virtual_member_function_template) 5182 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5183 } else { 5184 // Okay: Add virtual to the method. 5185 NewFD->setVirtualAsWritten(true); 5186 } 5187 } 5188 5189 // C++ [dcl.fct.spec]p3: 5190 // The inline specifier shall not appear on a block scope function 5191 // declaration. 5192 if (isInline && !NewFD->isInvalidDecl()) { 5193 if (CurContext->isFunctionOrMethod()) { 5194 // 'inline' is not allowed on block scope function declaration. 5195 Diag(D.getDeclSpec().getInlineSpecLoc(), 5196 diag::err_inline_declaration_block_scope) << Name 5197 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5198 } 5199 } 5200 5201 // C++ [dcl.fct.spec]p6: 5202 // The explicit specifier shall be used only in the declaration of a 5203 // constructor or conversion function within its class definition; 5204 // see 12.3.1 and 12.3.2. 5205 if (isExplicit && !NewFD->isInvalidDecl()) { 5206 if (!CurContext->isRecord()) { 5207 // 'explicit' was specified outside of the class. 5208 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5209 diag::err_explicit_out_of_class) 5210 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5211 } else if (!isa<CXXConstructorDecl>(NewFD) && 5212 !isa<CXXConversionDecl>(NewFD)) { 5213 // 'explicit' was specified on a function that wasn't a constructor 5214 // or conversion function. 5215 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5216 diag::err_explicit_non_ctor_or_conv_function) 5217 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5218 } 5219 } 5220 5221 if (isConstexpr) { 5222 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5223 // are implicitly inline. 5224 NewFD->setImplicitlyInline(); 5225 5226 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5227 // be either constructors or to return a literal type. Therefore, 5228 // destructors cannot be declared constexpr. 5229 if (isa<CXXDestructorDecl>(NewFD)) 5230 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5231 } 5232 5233 // If __module_private__ was specified, mark the function accordingly. 5234 if (D.getDeclSpec().isModulePrivateSpecified()) { 5235 if (isFunctionTemplateSpecialization) { 5236 SourceLocation ModulePrivateLoc 5237 = D.getDeclSpec().getModulePrivateSpecLoc(); 5238 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5239 << 0 5240 << FixItHint::CreateRemoval(ModulePrivateLoc); 5241 } else { 5242 NewFD->setModulePrivate(); 5243 if (FunctionTemplate) 5244 FunctionTemplate->setModulePrivate(); 5245 } 5246 } 5247 5248 if (isFriend) { 5249 // For now, claim that the objects have no previous declaration. 5250 if (FunctionTemplate) { 5251 FunctionTemplate->setObjectOfFriendDecl(false); 5252 FunctionTemplate->setAccess(AS_public); 5253 } 5254 NewFD->setObjectOfFriendDecl(false); 5255 NewFD->setAccess(AS_public); 5256 } 5257 5258 // If a function is defined as defaulted or deleted, mark it as such now. 5259 switch (D.getFunctionDefinitionKind()) { 5260 case FDK_Declaration: 5261 case FDK_Definition: 5262 break; 5263 5264 case FDK_Defaulted: 5265 NewFD->setDefaulted(); 5266 break; 5267 5268 case FDK_Deleted: 5269 NewFD->setDeletedAsWritten(); 5270 break; 5271 } 5272 5273 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5274 D.isFunctionDefinition()) { 5275 // C++ [class.mfct]p2: 5276 // A member function may be defined (8.4) in its class definition, in 5277 // which case it is an inline member function (7.1.2) 5278 NewFD->setImplicitlyInline(); 5279 } 5280 5281 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5282 !CurContext->isRecord()) { 5283 // C++ [class.static]p1: 5284 // A data or function member of a class may be declared static 5285 // in a class definition, in which case it is a static member of 5286 // the class. 5287 5288 // Complain about the 'static' specifier if it's on an out-of-line 5289 // member function definition. 5290 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5291 diag::err_static_out_of_line) 5292 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5293 } 5294 } 5295 5296 // Filter out previous declarations that don't match the scope. 5297 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5298 isExplicitSpecialization || 5299 isFunctionTemplateSpecialization); 5300 5301 // Handle GNU asm-label extension (encoded as an attribute). 5302 if (Expr *E = (Expr*) D.getAsmLabel()) { 5303 // The parser guarantees this is a string. 5304 StringLiteral *SE = cast<StringLiteral>(E); 5305 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5306 SE->getString())); 5307 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 5308 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 5309 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); 5310 if (I != ExtnameUndeclaredIdentifiers.end()) { 5311 NewFD->addAttr(I->second); 5312 ExtnameUndeclaredIdentifiers.erase(I); 5313 } 5314 } 5315 5316 // Copy the parameter declarations from the declarator D to the function 5317 // declaration NewFD, if they are available. First scavenge them into Params. 5318 SmallVector<ParmVarDecl*, 16> Params; 5319 if (D.isFunctionDeclarator()) { 5320 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5321 5322 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5323 // function that takes no arguments, not a function that takes a 5324 // single void argument. 5325 // We let through "const void" here because Sema::GetTypeForDeclarator 5326 // already checks for that case. 5327 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5328 FTI.ArgInfo[0].Param && 5329 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5330 // Empty arg list, don't push any params. 5331 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5332 5333 // In C++, the empty parameter-type-list must be spelled "void"; a 5334 // typedef of void is not permitted. 5335 if (getLangOpts().CPlusPlus && 5336 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5337 bool IsTypeAlias = false; 5338 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5339 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5340 else if (const TemplateSpecializationType *TST = 5341 Param->getType()->getAs<TemplateSpecializationType>()) 5342 IsTypeAlias = TST->isTypeAlias(); 5343 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5344 << IsTypeAlias; 5345 } 5346 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5347 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5348 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5349 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5350 Param->setDeclContext(NewFD); 5351 Params.push_back(Param); 5352 5353 if (Param->isInvalidDecl()) 5354 NewFD->setInvalidDecl(); 5355 } 5356 } 5357 5358 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5359 // When we're declaring a function with a typedef, typeof, etc as in the 5360 // following example, we'll need to synthesize (unnamed) 5361 // parameters for use in the declaration. 5362 // 5363 // @code 5364 // typedef void fn(int); 5365 // fn f; 5366 // @endcode 5367 5368 // Synthesize a parameter for each argument type. 5369 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5370 AE = FT->arg_type_end(); AI != AE; ++AI) { 5371 ParmVarDecl *Param = 5372 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5373 Param->setScopeInfo(0, Params.size()); 5374 Params.push_back(Param); 5375 } 5376 } else { 5377 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5378 "Should not need args for typedef of non-prototype fn"); 5379 } 5380 5381 // Finally, we know we have the right number of parameters, install them. 5382 NewFD->setParams(Params); 5383 5384 // Find all anonymous symbols defined during the declaration of this function 5385 // and add to NewFD. This lets us track decls such 'enum Y' in: 5386 // 5387 // void f(enum Y {AA} x) {} 5388 // 5389 // which would otherwise incorrectly end up in the translation unit scope. 5390 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope); 5391 DeclsInPrototypeScope.clear(); 5392 5393 // Process the non-inheritable attributes on this declaration. 5394 ProcessDeclAttributes(S, NewFD, D, 5395 /*NonInheritable=*/true, /*Inheritable=*/false); 5396 5397 // Functions returning a variably modified type violate C99 6.7.5.2p2 5398 // because all functions have linkage. 5399 if (!NewFD->isInvalidDecl() && 5400 NewFD->getResultType()->isVariablyModifiedType()) { 5401 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5402 NewFD->setInvalidDecl(); 5403 } 5404 5405 // Handle attributes. 5406 ProcessDeclAttributes(S, NewFD, D, 5407 /*NonInheritable=*/false, /*Inheritable=*/true); 5408 5409 if (!getLangOpts().CPlusPlus) { 5410 // Perform semantic checking on the function declaration. 5411 bool isExplicitSpecialization=false; 5412 if (!NewFD->isInvalidDecl()) { 5413 if (NewFD->isMain()) 5414 CheckMain(NewFD, D.getDeclSpec()); 5415 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5416 isExplicitSpecialization)); 5417 } 5418 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5419 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5420 "previous declaration set still overloaded"); 5421 } else { 5422 // If the declarator is a template-id, translate the parser's template 5423 // argument list into our AST format. 5424 bool HasExplicitTemplateArgs = false; 5425 TemplateArgumentListInfo TemplateArgs; 5426 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5427 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5428 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5429 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5430 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5431 TemplateId->getTemplateArgs(), 5432 TemplateId->NumArgs); 5433 translateTemplateArguments(TemplateArgsPtr, 5434 TemplateArgs); 5435 TemplateArgsPtr.release(); 5436 5437 HasExplicitTemplateArgs = true; 5438 5439 if (NewFD->isInvalidDecl()) { 5440 HasExplicitTemplateArgs = false; 5441 } else if (FunctionTemplate) { 5442 // Function template with explicit template arguments. 5443 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5444 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5445 5446 HasExplicitTemplateArgs = false; 5447 } else if (!isFunctionTemplateSpecialization && 5448 !D.getDeclSpec().isFriendSpecified()) { 5449 // We have encountered something that the user meant to be a 5450 // specialization (because it has explicitly-specified template 5451 // arguments) but that was not introduced with a "template<>" (or had 5452 // too few of them). 5453 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5454 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5455 << FixItHint::CreateInsertion( 5456 D.getDeclSpec().getLocStart(), 5457 "template<> "); 5458 isFunctionTemplateSpecialization = true; 5459 } else { 5460 // "friend void foo<>(int);" is an implicit specialization decl. 5461 isFunctionTemplateSpecialization = true; 5462 } 5463 } else if (isFriend && isFunctionTemplateSpecialization) { 5464 // This combination is only possible in a recovery case; the user 5465 // wrote something like: 5466 // template <> friend void foo(int); 5467 // which we're recovering from as if the user had written: 5468 // friend void foo<>(int); 5469 // Go ahead and fake up a template id. 5470 HasExplicitTemplateArgs = true; 5471 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5472 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5473 } 5474 5475 // If it's a friend (and only if it's a friend), it's possible 5476 // that either the specialized function type or the specialized 5477 // template is dependent, and therefore matching will fail. In 5478 // this case, don't check the specialization yet. 5479 bool InstantiationDependent = false; 5480 if (isFunctionTemplateSpecialization && isFriend && 5481 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5482 TemplateSpecializationType::anyDependentTemplateArguments( 5483 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5484 InstantiationDependent))) { 5485 assert(HasExplicitTemplateArgs && 5486 "friend function specialization without template args"); 5487 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5488 Previous)) 5489 NewFD->setInvalidDecl(); 5490 } else if (isFunctionTemplateSpecialization) { 5491 if (CurContext->isDependentContext() && CurContext->isRecord() 5492 && !isFriend) { 5493 isDependentClassScopeExplicitSpecialization = true; 5494 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ? 5495 diag::ext_function_specialization_in_class : 5496 diag::err_function_specialization_in_class) 5497 << NewFD->getDeclName(); 5498 } else if (CheckFunctionTemplateSpecialization(NewFD, 5499 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5500 Previous)) 5501 NewFD->setInvalidDecl(); 5502 5503 // C++ [dcl.stc]p1: 5504 // A storage-class-specifier shall not be specified in an explicit 5505 // specialization (14.7.3) 5506 if (SC != SC_None) { 5507 if (SC != NewFD->getStorageClass()) 5508 Diag(NewFD->getLocation(), 5509 diag::err_explicit_specialization_inconsistent_storage_class) 5510 << SC 5511 << FixItHint::CreateRemoval( 5512 D.getDeclSpec().getStorageClassSpecLoc()); 5513 5514 else 5515 Diag(NewFD->getLocation(), 5516 diag::ext_explicit_specialization_storage_class) 5517 << FixItHint::CreateRemoval( 5518 D.getDeclSpec().getStorageClassSpecLoc()); 5519 } 5520 5521 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5522 if (CheckMemberSpecialization(NewFD, Previous)) 5523 NewFD->setInvalidDecl(); 5524 } 5525 5526 // Perform semantic checking on the function declaration. 5527 if (!isDependentClassScopeExplicitSpecialization) { 5528 if (NewFD->isInvalidDecl()) { 5529 // If this is a class member, mark the class invalid immediately. 5530 // This avoids some consistency errors later. 5531 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5532 methodDecl->getParent()->setInvalidDecl(); 5533 } else { 5534 if (NewFD->isMain()) 5535 CheckMain(NewFD, D.getDeclSpec()); 5536 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5537 isExplicitSpecialization)); 5538 } 5539 } 5540 5541 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5542 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5543 "previous declaration set still overloaded"); 5544 5545 NamedDecl *PrincipalDecl = (FunctionTemplate 5546 ? cast<NamedDecl>(FunctionTemplate) 5547 : NewFD); 5548 5549 if (isFriend && D.isRedeclaration()) { 5550 AccessSpecifier Access = AS_public; 5551 if (!NewFD->isInvalidDecl()) 5552 Access = NewFD->getPreviousDecl()->getAccess(); 5553 5554 NewFD->setAccess(Access); 5555 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5556 5557 PrincipalDecl->setObjectOfFriendDecl(true); 5558 } 5559 5560 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5561 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5562 PrincipalDecl->setNonMemberOperator(); 5563 5564 // If we have a function template, check the template parameter 5565 // list. This will check and merge default template arguments. 5566 if (FunctionTemplate) { 5567 FunctionTemplateDecl *PrevTemplate = 5568 FunctionTemplate->getPreviousDecl(); 5569 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5570 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5571 D.getDeclSpec().isFriendSpecified() 5572 ? (D.isFunctionDefinition() 5573 ? TPC_FriendFunctionTemplateDefinition 5574 : TPC_FriendFunctionTemplate) 5575 : (D.getCXXScopeSpec().isSet() && 5576 DC && DC->isRecord() && 5577 DC->isDependentContext()) 5578 ? TPC_ClassTemplateMember 5579 : TPC_FunctionTemplate); 5580 } 5581 5582 if (NewFD->isInvalidDecl()) { 5583 // Ignore all the rest of this. 5584 } else if (!D.isRedeclaration()) { 5585 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5586 AddToScope }; 5587 // Fake up an access specifier if it's supposed to be a class member. 5588 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5589 NewFD->setAccess(AS_public); 5590 5591 // Qualified decls generally require a previous declaration. 5592 if (D.getCXXScopeSpec().isSet()) { 5593 // ...with the major exception of templated-scope or 5594 // dependent-scope friend declarations. 5595 5596 // TODO: we currently also suppress this check in dependent 5597 // contexts because (1) the parameter depth will be off when 5598 // matching friend templates and (2) we might actually be 5599 // selecting a friend based on a dependent factor. But there 5600 // are situations where these conditions don't apply and we 5601 // can actually do this check immediately. 5602 if (isFriend && 5603 (TemplateParamLists.size() || 5604 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5605 CurContext->isDependentContext())) { 5606 // ignore these 5607 } else { 5608 // The user tried to provide an out-of-line definition for a 5609 // function that is a member of a class or namespace, but there 5610 // was no such member function declared (C++ [class.mfct]p2, 5611 // C++ [namespace.memdef]p2). For example: 5612 // 5613 // class X { 5614 // void f() const; 5615 // }; 5616 // 5617 // void X::f() { } // ill-formed 5618 // 5619 // Complain about this problem, and attempt to suggest close 5620 // matches (e.g., those that differ only in cv-qualifiers and 5621 // whether the parameter types are references). 5622 5623 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5624 NewFD, 5625 ExtraArgs)) { 5626 AddToScope = ExtraArgs.AddToScope; 5627 return Result; 5628 } 5629 } 5630 5631 // Unqualified local friend declarations are required to resolve 5632 // to something. 5633 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5634 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5635 NewFD, 5636 ExtraArgs)) { 5637 AddToScope = ExtraArgs.AddToScope; 5638 return Result; 5639 } 5640 } 5641 5642 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5643 !isFriend && !isFunctionTemplateSpecialization && 5644 !isExplicitSpecialization) { 5645 // An out-of-line member function declaration must also be a 5646 // definition (C++ [dcl.meaning]p1). 5647 // Note that this is not the case for explicit specializations of 5648 // function templates or member functions of class templates, per 5649 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5650 // extension for compatibility with old SWIG code which likes to 5651 // generate them. 5652 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5653 << D.getCXXScopeSpec().getRange(); 5654 } 5655 } 5656 5657 // attributes declared post-definition are currently ignored 5658 // FIXME: This should happen during attribute merging 5659 if (D.isRedeclaration() && Previous.isSingleResult()) { 5660 const FunctionDecl *Def; 5661 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5662 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5663 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5664 Diag(Def->getLocation(), diag::note_previous_definition); 5665 } 5666 } 5667 5668 AddKnownFunctionAttributes(NewFD); 5669 5670 if (NewFD->hasAttr<OverloadableAttr>() && 5671 !NewFD->getType()->getAs<FunctionProtoType>()) { 5672 Diag(NewFD->getLocation(), 5673 diag::err_attribute_overloadable_no_prototype) 5674 << NewFD; 5675 5676 // Turn this into a variadic function with no parameters. 5677 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5678 FunctionProtoType::ExtProtoInfo EPI; 5679 EPI.Variadic = true; 5680 EPI.ExtInfo = FT->getExtInfo(); 5681 5682 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5683 NewFD->setType(R); 5684 } 5685 5686 // If there's a #pragma GCC visibility in scope, and this isn't a class 5687 // member, set the visibility of this function. 5688 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5689 AddPushedVisibilityAttribute(NewFD); 5690 5691 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5692 // marking the function. 5693 AddCFAuditedAttribute(NewFD); 5694 5695 // If this is a locally-scoped extern C function, update the 5696 // map of such names. 5697 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5698 && !NewFD->isInvalidDecl()) 5699 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5700 5701 // Set this FunctionDecl's range up to the right paren. 5702 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5703 5704 if (getLangOpts().CPlusPlus) { 5705 if (FunctionTemplate) { 5706 if (NewFD->isInvalidDecl()) 5707 FunctionTemplate->setInvalidDecl(); 5708 return FunctionTemplate; 5709 } 5710 } 5711 5712 MarkUnusedFileScopedDecl(NewFD); 5713 5714 if (getLangOpts().CUDA) 5715 if (IdentifierInfo *II = NewFD->getIdentifier()) 5716 if (!NewFD->isInvalidDecl() && 5717 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5718 if (II->isStr("cudaConfigureCall")) { 5719 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5720 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5721 5722 Context.setcudaConfigureCallDecl(NewFD); 5723 } 5724 } 5725 5726 // Here we have an function template explicit specialization at class scope. 5727 // The actually specialization will be postponed to template instatiation 5728 // time via the ClassScopeFunctionSpecializationDecl node. 5729 if (isDependentClassScopeExplicitSpecialization) { 5730 ClassScopeFunctionSpecializationDecl *NewSpec = 5731 ClassScopeFunctionSpecializationDecl::Create( 5732 Context, CurContext, SourceLocation(), 5733 cast<CXXMethodDecl>(NewFD)); 5734 CurContext->addDecl(NewSpec); 5735 AddToScope = false; 5736 } 5737 5738 return NewFD; 5739} 5740 5741/// \brief Perform semantic checking of a new function declaration. 5742/// 5743/// Performs semantic analysis of the new function declaration 5744/// NewFD. This routine performs all semantic checking that does not 5745/// require the actual declarator involved in the declaration, and is 5746/// used both for the declaration of functions as they are parsed 5747/// (called via ActOnDeclarator) and for the declaration of functions 5748/// that have been instantiated via C++ template instantiation (called 5749/// via InstantiateDecl). 5750/// 5751/// \param IsExplicitSpecialiation whether this new function declaration is 5752/// an explicit specialization of the previous declaration. 5753/// 5754/// This sets NewFD->isInvalidDecl() to true if there was an error. 5755/// 5756/// Returns true if the function declaration is a redeclaration. 5757bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5758 LookupResult &Previous, 5759 bool IsExplicitSpecialization) { 5760 assert(!NewFD->getResultType()->isVariablyModifiedType() 5761 && "Variably modified return types are not handled here"); 5762 5763 // Check for a previous declaration of this name. 5764 if (Previous.empty() && NewFD->isExternC()) { 5765 // Since we did not find anything by this name and we're declaring 5766 // an extern "C" function, look for a non-visible extern "C" 5767 // declaration with the same name. 5768 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5769 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5770 if (Pos != LocallyScopedExternalDecls.end()) 5771 Previous.addDecl(Pos->second); 5772 } 5773 5774 bool Redeclaration = false; 5775 5776 // Merge or overload the declaration with an existing declaration of 5777 // the same name, if appropriate. 5778 if (!Previous.empty()) { 5779 // Determine whether NewFD is an overload of PrevDecl or 5780 // a declaration that requires merging. If it's an overload, 5781 // there's no more work to do here; we'll just add the new 5782 // function to the scope. 5783 5784 NamedDecl *OldDecl = 0; 5785 if (!AllowOverloadingOfFunction(Previous, Context)) { 5786 Redeclaration = true; 5787 OldDecl = Previous.getFoundDecl(); 5788 } else { 5789 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5790 /*NewIsUsingDecl*/ false)) { 5791 case Ovl_Match: 5792 Redeclaration = true; 5793 break; 5794 5795 case Ovl_NonFunction: 5796 Redeclaration = true; 5797 break; 5798 5799 case Ovl_Overload: 5800 Redeclaration = false; 5801 break; 5802 } 5803 5804 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5805 // If a function name is overloadable in C, then every function 5806 // with that name must be marked "overloadable". 5807 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5808 << Redeclaration << NewFD; 5809 NamedDecl *OverloadedDecl = 0; 5810 if (Redeclaration) 5811 OverloadedDecl = OldDecl; 5812 else if (!Previous.empty()) 5813 OverloadedDecl = Previous.getRepresentativeDecl(); 5814 if (OverloadedDecl) 5815 Diag(OverloadedDecl->getLocation(), 5816 diag::note_attribute_overloadable_prev_overload); 5817 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5818 Context)); 5819 } 5820 } 5821 5822 if (Redeclaration) { 5823 // NewFD and OldDecl represent declarations that need to be 5824 // merged. 5825 if (MergeFunctionDecl(NewFD, OldDecl, S)) { 5826 NewFD->setInvalidDecl(); 5827 return Redeclaration; 5828 } 5829 5830 Previous.clear(); 5831 Previous.addDecl(OldDecl); 5832 5833 if (FunctionTemplateDecl *OldTemplateDecl 5834 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5835 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5836 FunctionTemplateDecl *NewTemplateDecl 5837 = NewFD->getDescribedFunctionTemplate(); 5838 assert(NewTemplateDecl && "Template/non-template mismatch"); 5839 if (CXXMethodDecl *Method 5840 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5841 Method->setAccess(OldTemplateDecl->getAccess()); 5842 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5843 } 5844 5845 // If this is an explicit specialization of a member that is a function 5846 // template, mark it as a member specialization. 5847 if (IsExplicitSpecialization && 5848 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5849 NewTemplateDecl->setMemberSpecialization(); 5850 assert(OldTemplateDecl->isMemberSpecialization()); 5851 } 5852 5853 } else { 5854 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5855 NewFD->setAccess(OldDecl->getAccess()); 5856 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5857 } 5858 } 5859 } 5860 5861 // Semantic checking for this function declaration (in isolation). 5862 if (getLangOpts().CPlusPlus) { 5863 // C++-specific checks. 5864 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5865 CheckConstructor(Constructor); 5866 } else if (CXXDestructorDecl *Destructor = 5867 dyn_cast<CXXDestructorDecl>(NewFD)) { 5868 CXXRecordDecl *Record = Destructor->getParent(); 5869 QualType ClassType = Context.getTypeDeclType(Record); 5870 5871 // FIXME: Shouldn't we be able to perform this check even when the class 5872 // type is dependent? Both gcc and edg can handle that. 5873 if (!ClassType->isDependentType()) { 5874 DeclarationName Name 5875 = Context.DeclarationNames.getCXXDestructorName( 5876 Context.getCanonicalType(ClassType)); 5877 if (NewFD->getDeclName() != Name) { 5878 Diag(NewFD->getLocation(), diag::err_destructor_name); 5879 NewFD->setInvalidDecl(); 5880 return Redeclaration; 5881 } 5882 } 5883 } else if (CXXConversionDecl *Conversion 5884 = dyn_cast<CXXConversionDecl>(NewFD)) { 5885 ActOnConversionDeclarator(Conversion); 5886 } 5887 5888 // Find any virtual functions that this function overrides. 5889 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5890 if (!Method->isFunctionTemplateSpecialization() && 5891 !Method->getDescribedFunctionTemplate()) { 5892 if (AddOverriddenMethods(Method->getParent(), Method)) { 5893 // If the function was marked as "static", we have a problem. 5894 if (NewFD->getStorageClass() == SC_Static) { 5895 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5896 << NewFD->getDeclName(); 5897 for (CXXMethodDecl::method_iterator 5898 Overridden = Method->begin_overridden_methods(), 5899 OverriddenEnd = Method->end_overridden_methods(); 5900 Overridden != OverriddenEnd; 5901 ++Overridden) { 5902 Diag((*Overridden)->getLocation(), 5903 diag::note_overridden_virtual_function); 5904 } 5905 } 5906 } 5907 } 5908 5909 if (Method->isStatic()) 5910 checkThisInStaticMemberFunctionType(Method); 5911 } 5912 5913 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5914 if (NewFD->isOverloadedOperator() && 5915 CheckOverloadedOperatorDeclaration(NewFD)) { 5916 NewFD->setInvalidDecl(); 5917 return Redeclaration; 5918 } 5919 5920 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5921 if (NewFD->getLiteralIdentifier() && 5922 CheckLiteralOperatorDeclaration(NewFD)) { 5923 NewFD->setInvalidDecl(); 5924 return Redeclaration; 5925 } 5926 5927 // In C++, check default arguments now that we have merged decls. Unless 5928 // the lexical context is the class, because in this case this is done 5929 // during delayed parsing anyway. 5930 if (!CurContext->isRecord()) 5931 CheckCXXDefaultArguments(NewFD); 5932 5933 // If this function declares a builtin function, check the type of this 5934 // declaration against the expected type for the builtin. 5935 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5936 ASTContext::GetBuiltinTypeError Error; 5937 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5938 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5939 // The type of this function differs from the type of the builtin, 5940 // so forget about the builtin entirely. 5941 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5942 } 5943 } 5944 5945 // If this function is declared as being extern "C", then check to see if 5946 // the function returns a UDT (class, struct, or union type) that is not C 5947 // compatible, and if it does, warn the user. 5948 if (NewFD->isExternC()) { 5949 QualType R = NewFD->getResultType(); 5950 if (!R.isPODType(Context) && 5951 !R->isVoidType()) 5952 Diag( NewFD->getLocation(), diag::warn_return_value_udt ) 5953 << NewFD << R; 5954 } 5955 } 5956 return Redeclaration; 5957} 5958 5959void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5960 // C++11 [basic.start.main]p3: A program that declares main to be inline, 5961 // static or constexpr is ill-formed. 5962 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5963 // shall not appear in a declaration of main. 5964 // static main is not an error under C99, but we should warn about it. 5965 if (FD->getStorageClass() == SC_Static) 5966 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus 5967 ? diag::err_static_main : diag::warn_static_main) 5968 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5969 if (FD->isInlineSpecified()) 5970 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5971 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5972 if (FD->isConstexpr()) { 5973 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 5974 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 5975 FD->setConstexpr(false); 5976 } 5977 5978 QualType T = FD->getType(); 5979 assert(T->isFunctionType() && "function decl is not of function type"); 5980 const FunctionType* FT = T->castAs<FunctionType>(); 5981 5982 // All the standards say that main() should should return 'int'. 5983 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5984 // In C and C++, main magically returns 0 if you fall off the end; 5985 // set the flag which tells us that. 5986 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5987 FD->setHasImplicitReturnZero(true); 5988 5989 // In C with GNU extensions we allow main() to have non-integer return 5990 // type, but we should warn about the extension, and we disable the 5991 // implicit-return-zero rule. 5992 } else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) { 5993 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); 5994 5995 // Otherwise, this is just a flat-out error. 5996 } else { 5997 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5998 FD->setInvalidDecl(true); 5999 } 6000 6001 // Treat protoless main() as nullary. 6002 if (isa<FunctionNoProtoType>(FT)) return; 6003 6004 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 6005 unsigned nparams = FTP->getNumArgs(); 6006 assert(FD->getNumParams() == nparams); 6007 6008 bool HasExtraParameters = (nparams > 3); 6009 6010 // Darwin passes an undocumented fourth argument of type char**. If 6011 // other platforms start sprouting these, the logic below will start 6012 // getting shifty. 6013 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 6014 HasExtraParameters = false; 6015 6016 if (HasExtraParameters) { 6017 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 6018 FD->setInvalidDecl(true); 6019 nparams = 3; 6020 } 6021 6022 // FIXME: a lot of the following diagnostics would be improved 6023 // if we had some location information about types. 6024 6025 QualType CharPP = 6026 Context.getPointerType(Context.getPointerType(Context.CharTy)); 6027 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 6028 6029 for (unsigned i = 0; i < nparams; ++i) { 6030 QualType AT = FTP->getArgType(i); 6031 6032 bool mismatch = true; 6033 6034 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 6035 mismatch = false; 6036 else if (Expected[i] == CharPP) { 6037 // As an extension, the following forms are okay: 6038 // char const ** 6039 // char const * const * 6040 // char * const * 6041 6042 QualifierCollector qs; 6043 const PointerType* PT; 6044 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 6045 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 6046 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 6047 qs.removeConst(); 6048 mismatch = !qs.empty(); 6049 } 6050 } 6051 6052 if (mismatch) { 6053 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 6054 // TODO: suggest replacing given type with expected type 6055 FD->setInvalidDecl(true); 6056 } 6057 } 6058 6059 if (nparams == 1 && !FD->isInvalidDecl()) { 6060 Diag(FD->getLocation(), diag::warn_main_one_arg); 6061 } 6062 6063 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 6064 Diag(FD->getLocation(), diag::err_main_template_decl); 6065 FD->setInvalidDecl(); 6066 } 6067} 6068 6069bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 6070 // FIXME: Need strict checking. In C89, we need to check for 6071 // any assignment, increment, decrement, function-calls, or 6072 // commas outside of a sizeof. In C99, it's the same list, 6073 // except that the aforementioned are allowed in unevaluated 6074 // expressions. Everything else falls under the 6075 // "may accept other forms of constant expressions" exception. 6076 // (We never end up here for C++, so the constant expression 6077 // rules there don't matter.) 6078 if (Init->isConstantInitializer(Context, false)) 6079 return false; 6080 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 6081 << Init->getSourceRange(); 6082 return true; 6083} 6084 6085namespace { 6086 // Visits an initialization expression to see if OrigDecl is evaluated in 6087 // its own initialization and throws a warning if it does. 6088 class SelfReferenceChecker 6089 : public EvaluatedExprVisitor<SelfReferenceChecker> { 6090 Sema &S; 6091 Decl *OrigDecl; 6092 bool isRecordType; 6093 bool isPODType; 6094 6095 public: 6096 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 6097 6098 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 6099 S(S), OrigDecl(OrigDecl) { 6100 isPODType = false; 6101 isRecordType = false; 6102 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 6103 isPODType = VD->getType().isPODType(S.Context); 6104 isRecordType = VD->getType()->isRecordType(); 6105 } 6106 } 6107 6108 // Sometimes, the expression passed in lacks the casts that are used 6109 // to determine which DeclRefExpr's to check. Assume that the casts 6110 // are present and continue visiting the expression. 6111 void HandleExpr(Expr *E) { 6112 // Skip checking T a = a where T is not a record type. Doing so is a 6113 // way to silence uninitialized warnings. 6114 if (isRecordType) 6115 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 6116 HandleDeclRefExpr(DRE); 6117 6118 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 6119 HandleValue(CO->getTrueExpr()); 6120 HandleValue(CO->getFalseExpr()); 6121 } 6122 6123 Visit(E); 6124 } 6125 6126 // For most expressions, the cast is directly above the DeclRefExpr. 6127 // For conditional operators, the cast can be outside the conditional 6128 // operator if both expressions are DeclRefExpr's. 6129 void HandleValue(Expr *E) { 6130 E = E->IgnoreParenImpCasts(); 6131 if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) { 6132 HandleDeclRefExpr(DRE); 6133 return; 6134 } 6135 6136 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 6137 HandleValue(CO->getTrueExpr()); 6138 HandleValue(CO->getFalseExpr()); 6139 } 6140 } 6141 6142 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 6143 if ((!isRecordType && E->getCastKind() == CK_LValueToRValue) || 6144 (isRecordType && E->getCastKind() == CK_NoOp)) 6145 HandleValue(E->getSubExpr()); 6146 6147 Inherited::VisitImplicitCastExpr(E); 6148 } 6149 6150 void VisitMemberExpr(MemberExpr *E) { 6151 // Don't warn on arrays since they can be treated as pointers. 6152 if (E->getType()->canDecayToPointerType()) return; 6153 6154 ValueDecl *VD = E->getMemberDecl(); 6155 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(VD); 6156 if (isa<FieldDecl>(VD) || (MD && !MD->isStatic())) 6157 if (DeclRefExpr *DRE 6158 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 6159 HandleDeclRefExpr(DRE); 6160 return; 6161 } 6162 6163 Inherited::VisitMemberExpr(E); 6164 } 6165 6166 void VisitUnaryOperator(UnaryOperator *E) { 6167 // For POD record types, addresses of its own members are well-defined. 6168 if (E->getOpcode() == UO_AddrOf && isRecordType && isPODType && 6169 isa<MemberExpr>(E->getSubExpr())) return; 6170 Inherited::VisitUnaryOperator(E); 6171 } 6172 6173 void VisitObjCMessageExpr(ObjCMessageExpr *E) { return; } 6174 6175 void HandleDeclRefExpr(DeclRefExpr *DRE) { 6176 Decl* ReferenceDecl = DRE->getDecl(); 6177 if (OrigDecl != ReferenceDecl) return; 6178 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 6179 Sema::NotForRedeclaration); 6180 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 6181 S.PDiag(diag::warn_uninit_self_reference_in_init) 6182 << Result.getLookupName() 6183 << OrigDecl->getLocation() 6184 << DRE->getSourceRange()); 6185 } 6186 }; 6187} 6188 6189/// CheckSelfReference - Warns if OrigDecl is used in expression E. 6190void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 6191 SelfReferenceChecker(*this, OrigDecl).HandleExpr(E); 6192} 6193 6194/// AddInitializerToDecl - Adds the initializer Init to the 6195/// declaration dcl. If DirectInit is true, this is C++ direct 6196/// initialization rather than copy initialization. 6197void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 6198 bool DirectInit, bool TypeMayContainAuto) { 6199 // If there is no declaration, there was an error parsing it. Just ignore 6200 // the initializer. 6201 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 6202 return; 6203 6204 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6205 // With declarators parsed the way they are, the parser cannot 6206 // distinguish between a normal initializer and a pure-specifier. 6207 // Thus this grotesque test. 6208 IntegerLiteral *IL; 6209 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6210 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6211 CheckPureMethod(Method, Init->getSourceRange()); 6212 else { 6213 Diag(Method->getLocation(), diag::err_member_function_initialization) 6214 << Method->getDeclName() << Init->getSourceRange(); 6215 Method->setInvalidDecl(); 6216 } 6217 return; 6218 } 6219 6220 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6221 if (!VDecl) { 6222 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6223 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6224 RealDecl->setInvalidDecl(); 6225 return; 6226 } 6227 6228 // Check for self-references within variable initializers. 6229 // Variables declared within a function/method body are handled 6230 // by a dataflow analysis. 6231 if (!VDecl->hasLocalStorage() && !VDecl->isStaticLocal()) 6232 CheckSelfReference(RealDecl, Init); 6233 6234 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); 6235 6236 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6237 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6238 Expr *DeduceInit = Init; 6239 // Initializer could be a C++ direct-initializer. Deduction only works if it 6240 // contains exactly one expression. 6241 if (CXXDirectInit) { 6242 if (CXXDirectInit->getNumExprs() == 0) { 6243 // It isn't possible to write this directly, but it is possible to 6244 // end up in this situation with "auto x(some_pack...);" 6245 Diag(CXXDirectInit->getLocStart(), 6246 diag::err_auto_var_init_no_expression) 6247 << VDecl->getDeclName() << VDecl->getType() 6248 << VDecl->getSourceRange(); 6249 RealDecl->setInvalidDecl(); 6250 return; 6251 } else if (CXXDirectInit->getNumExprs() > 1) { 6252 Diag(CXXDirectInit->getExpr(1)->getLocStart(), 6253 diag::err_auto_var_init_multiple_expressions) 6254 << VDecl->getDeclName() << VDecl->getType() 6255 << VDecl->getSourceRange(); 6256 RealDecl->setInvalidDecl(); 6257 return; 6258 } else { 6259 DeduceInit = CXXDirectInit->getExpr(0); 6260 } 6261 } 6262 TypeSourceInfo *DeducedType = 0; 6263 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) == 6264 DAR_Failed) 6265 DiagnoseAutoDeductionFailure(VDecl, DeduceInit); 6266 if (!DeducedType) { 6267 RealDecl->setInvalidDecl(); 6268 return; 6269 } 6270 VDecl->setTypeSourceInfo(DeducedType); 6271 VDecl->setType(DeducedType->getType()); 6272 VDecl->ClearLinkageCache(); 6273 6274 // In ARC, infer lifetime. 6275 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6276 VDecl->setInvalidDecl(); 6277 6278 // If this is a redeclaration, check that the type we just deduced matches 6279 // the previously declared type. 6280 if (VarDecl *Old = VDecl->getPreviousDecl()) 6281 MergeVarDeclTypes(VDecl, Old); 6282 } 6283 6284 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6285 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6286 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6287 VDecl->setInvalidDecl(); 6288 return; 6289 } 6290 6291 if (!VDecl->getType()->isDependentType()) { 6292 // A definition must end up with a complete type, which means it must be 6293 // complete with the restriction that an array type might be completed by 6294 // the initializer; note that later code assumes this restriction. 6295 QualType BaseDeclType = VDecl->getType(); 6296 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6297 BaseDeclType = Array->getElementType(); 6298 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6299 diag::err_typecheck_decl_incomplete_type)) { 6300 RealDecl->setInvalidDecl(); 6301 return; 6302 } 6303 6304 // The variable can not have an abstract class type. 6305 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6306 diag::err_abstract_type_in_decl, 6307 AbstractVariableType)) 6308 VDecl->setInvalidDecl(); 6309 } 6310 6311 const VarDecl *Def; 6312 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6313 Diag(VDecl->getLocation(), diag::err_redefinition) 6314 << VDecl->getDeclName(); 6315 Diag(Def->getLocation(), diag::note_previous_definition); 6316 VDecl->setInvalidDecl(); 6317 return; 6318 } 6319 6320 const VarDecl* PrevInit = 0; 6321 if (getLangOpts().CPlusPlus) { 6322 // C++ [class.static.data]p4 6323 // If a static data member is of const integral or const 6324 // enumeration type, its declaration in the class definition can 6325 // specify a constant-initializer which shall be an integral 6326 // constant expression (5.19). In that case, the member can appear 6327 // in integral constant expressions. The member shall still be 6328 // defined in a namespace scope if it is used in the program and the 6329 // namespace scope definition shall not contain an initializer. 6330 // 6331 // We already performed a redefinition check above, but for static 6332 // data members we also need to check whether there was an in-class 6333 // declaration with an initializer. 6334 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6335 Diag(VDecl->getLocation(), diag::err_redefinition) 6336 << VDecl->getDeclName(); 6337 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6338 return; 6339 } 6340 6341 if (VDecl->hasLocalStorage()) 6342 getCurFunction()->setHasBranchProtectedScope(); 6343 6344 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6345 VDecl->setInvalidDecl(); 6346 return; 6347 } 6348 } 6349 6350 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6351 // a kernel function cannot be initialized." 6352 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6353 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6354 VDecl->setInvalidDecl(); 6355 return; 6356 } 6357 6358 // Get the decls type and save a reference for later, since 6359 // CheckInitializerTypes may change it. 6360 QualType DclT = VDecl->getType(), SavT = DclT; 6361 6362 // Top-level message sends default to 'id' when we're in a debugger 6363 // and we are assigning it to a variable of 'id' type. 6364 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCIdType()) 6365 if (Init->getType() == Context.UnknownAnyTy && isa<ObjCMessageExpr>(Init)) { 6366 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); 6367 if (Result.isInvalid()) { 6368 VDecl->setInvalidDecl(); 6369 return; 6370 } 6371 Init = Result.take(); 6372 } 6373 6374 // Perform the initialization. 6375 if (!VDecl->isInvalidDecl()) { 6376 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6377 InitializationKind Kind 6378 = DirectInit ? 6379 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6380 Init->getLocStart(), 6381 Init->getLocEnd()) 6382 : InitializationKind::CreateDirectList( 6383 VDecl->getLocation()) 6384 : InitializationKind::CreateCopy(VDecl->getLocation(), 6385 Init->getLocStart()); 6386 6387 Expr **Args = &Init; 6388 unsigned NumArgs = 1; 6389 if (CXXDirectInit) { 6390 Args = CXXDirectInit->getExprs(); 6391 NumArgs = CXXDirectInit->getNumExprs(); 6392 } 6393 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs); 6394 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6395 MultiExprArg(*this, Args,NumArgs), 6396 &DclT); 6397 if (Result.isInvalid()) { 6398 VDecl->setInvalidDecl(); 6399 return; 6400 } 6401 6402 Init = Result.takeAs<Expr>(); 6403 } 6404 6405 // If the type changed, it means we had an incomplete type that was 6406 // completed by the initializer. For example: 6407 // int ary[] = { 1, 3, 5 }; 6408 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6409 if (!VDecl->isInvalidDecl() && (DclT != SavT)) 6410 VDecl->setType(DclT); 6411 6412 // Check any implicit conversions within the expression. 6413 CheckImplicitConversions(Init, VDecl->getLocation()); 6414 6415 if (!VDecl->isInvalidDecl()) 6416 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6417 6418 Init = MaybeCreateExprWithCleanups(Init); 6419 // Attach the initializer to the decl. 6420 VDecl->setInit(Init); 6421 6422 if (VDecl->isLocalVarDecl()) { 6423 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6424 // static storage duration shall be constant expressions or string literals. 6425 // C++ does not have this restriction. 6426 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() && 6427 VDecl->getStorageClass() == SC_Static) 6428 CheckForConstantInitializer(Init, DclT); 6429 } else if (VDecl->isStaticDataMember() && 6430 VDecl->getLexicalDeclContext()->isRecord()) { 6431 // This is an in-class initialization for a static data member, e.g., 6432 // 6433 // struct S { 6434 // static const int value = 17; 6435 // }; 6436 6437 // C++ [class.mem]p4: 6438 // A member-declarator can contain a constant-initializer only 6439 // if it declares a static member (9.4) of const integral or 6440 // const enumeration type, see 9.4.2. 6441 // 6442 // C++11 [class.static.data]p3: 6443 // If a non-volatile const static data member is of integral or 6444 // enumeration type, its declaration in the class definition can 6445 // specify a brace-or-equal-initializer in which every initalizer-clause 6446 // that is an assignment-expression is a constant expression. A static 6447 // data member of literal type can be declared in the class definition 6448 // with the constexpr specifier; if so, its declaration shall specify a 6449 // brace-or-equal-initializer in which every initializer-clause that is 6450 // an assignment-expression is a constant expression. 6451 6452 // Do nothing on dependent types. 6453 if (DclT->isDependentType()) { 6454 6455 // Allow any 'static constexpr' members, whether or not they are of literal 6456 // type. We separately check that every constexpr variable is of literal 6457 // type. 6458 } else if (VDecl->isConstexpr()) { 6459 6460 // Require constness. 6461 } else if (!DclT.isConstQualified()) { 6462 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6463 << Init->getSourceRange(); 6464 VDecl->setInvalidDecl(); 6465 6466 // We allow integer constant expressions in all cases. 6467 } else if (DclT->isIntegralOrEnumerationType()) { 6468 // Check whether the expression is a constant expression. 6469 SourceLocation Loc; 6470 if (getLangOpts().CPlusPlus0x && DclT.isVolatileQualified()) 6471 // In C++11, a non-constexpr const static data member with an 6472 // in-class initializer cannot be volatile. 6473 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6474 else if (Init->isValueDependent()) 6475 ; // Nothing to check. 6476 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6477 ; // Ok, it's an ICE! 6478 else if (Init->isEvaluatable(Context)) { 6479 // If we can constant fold the initializer through heroics, accept it, 6480 // but report this as a use of an extension for -pedantic. 6481 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6482 << Init->getSourceRange(); 6483 } else { 6484 // Otherwise, this is some crazy unknown case. Report the issue at the 6485 // location provided by the isIntegerConstantExpr failed check. 6486 Diag(Loc, diag::err_in_class_initializer_non_constant) 6487 << Init->getSourceRange(); 6488 VDecl->setInvalidDecl(); 6489 } 6490 6491 // We allow foldable floating-point constants as an extension. 6492 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6493 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6494 << DclT << Init->getSourceRange(); 6495 if (getLangOpts().CPlusPlus0x) 6496 Diag(VDecl->getLocation(), 6497 diag::note_in_class_initializer_float_type_constexpr) 6498 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6499 6500 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6501 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6502 << Init->getSourceRange(); 6503 VDecl->setInvalidDecl(); 6504 } 6505 6506 // Suggest adding 'constexpr' in C++11 for literal types. 6507 } else if (getLangOpts().CPlusPlus0x && DclT->isLiteralType()) { 6508 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6509 << DclT << Init->getSourceRange() 6510 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6511 VDecl->setConstexpr(true); 6512 6513 } else { 6514 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6515 << DclT << Init->getSourceRange(); 6516 VDecl->setInvalidDecl(); 6517 } 6518 } else if (VDecl->isFileVarDecl()) { 6519 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6520 (!getLangOpts().CPlusPlus || 6521 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6522 Diag(VDecl->getLocation(), diag::warn_extern_init); 6523 6524 // C99 6.7.8p4. All file scoped initializers need to be constant. 6525 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) 6526 CheckForConstantInitializer(Init, DclT); 6527 } 6528 6529 // We will represent direct-initialization similarly to copy-initialization: 6530 // int x(1); -as-> int x = 1; 6531 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6532 // 6533 // Clients that want to distinguish between the two forms, can check for 6534 // direct initializer using VarDecl::getInitStyle(). 6535 // A major benefit is that clients that don't particularly care about which 6536 // exactly form was it (like the CodeGen) can handle both cases without 6537 // special case code. 6538 6539 // C++ 8.5p11: 6540 // The form of initialization (using parentheses or '=') is generally 6541 // insignificant, but does matter when the entity being initialized has a 6542 // class type. 6543 if (CXXDirectInit) { 6544 assert(DirectInit && "Call-style initializer must be direct init."); 6545 VDecl->setInitStyle(VarDecl::CallInit); 6546 } else if (DirectInit) { 6547 // This must be list-initialization. No other way is direct-initialization. 6548 VDecl->setInitStyle(VarDecl::ListInit); 6549 } 6550 6551 CheckCompleteVariableDeclaration(VDecl); 6552} 6553 6554/// ActOnInitializerError - Given that there was an error parsing an 6555/// initializer for the given declaration, try to return to some form 6556/// of sanity. 6557void Sema::ActOnInitializerError(Decl *D) { 6558 // Our main concern here is re-establishing invariants like "a 6559 // variable's type is either dependent or complete". 6560 if (!D || D->isInvalidDecl()) return; 6561 6562 VarDecl *VD = dyn_cast<VarDecl>(D); 6563 if (!VD) return; 6564 6565 // Auto types are meaningless if we can't make sense of the initializer. 6566 if (ParsingInitForAutoVars.count(D)) { 6567 D->setInvalidDecl(); 6568 return; 6569 } 6570 6571 QualType Ty = VD->getType(); 6572 if (Ty->isDependentType()) return; 6573 6574 // Require a complete type. 6575 if (RequireCompleteType(VD->getLocation(), 6576 Context.getBaseElementType(Ty), 6577 diag::err_typecheck_decl_incomplete_type)) { 6578 VD->setInvalidDecl(); 6579 return; 6580 } 6581 6582 // Require an abstract type. 6583 if (RequireNonAbstractType(VD->getLocation(), Ty, 6584 diag::err_abstract_type_in_decl, 6585 AbstractVariableType)) { 6586 VD->setInvalidDecl(); 6587 return; 6588 } 6589 6590 // Don't bother complaining about constructors or destructors, 6591 // though. 6592} 6593 6594void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6595 bool TypeMayContainAuto) { 6596 // If there is no declaration, there was an error parsing it. Just ignore it. 6597 if (RealDecl == 0) 6598 return; 6599 6600 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6601 QualType Type = Var->getType(); 6602 6603 // C++11 [dcl.spec.auto]p3 6604 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6605 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6606 << Var->getDeclName() << Type; 6607 Var->setInvalidDecl(); 6608 return; 6609 } 6610 6611 // C++11 [class.static.data]p3: A static data member can be declared with 6612 // the constexpr specifier; if so, its declaration shall specify 6613 // a brace-or-equal-initializer. 6614 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6615 // the definition of a variable [...] or the declaration of a static data 6616 // member. 6617 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6618 if (Var->isStaticDataMember()) 6619 Diag(Var->getLocation(), 6620 diag::err_constexpr_static_mem_var_requires_init) 6621 << Var->getDeclName(); 6622 else 6623 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6624 Var->setInvalidDecl(); 6625 return; 6626 } 6627 6628 switch (Var->isThisDeclarationADefinition()) { 6629 case VarDecl::Definition: 6630 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6631 break; 6632 6633 // We have an out-of-line definition of a static data member 6634 // that has an in-class initializer, so we type-check this like 6635 // a declaration. 6636 // 6637 // Fall through 6638 6639 case VarDecl::DeclarationOnly: 6640 // It's only a declaration. 6641 6642 // Block scope. C99 6.7p7: If an identifier for an object is 6643 // declared with no linkage (C99 6.2.2p6), the type for the 6644 // object shall be complete. 6645 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6646 !Var->getLinkage() && !Var->isInvalidDecl() && 6647 RequireCompleteType(Var->getLocation(), Type, 6648 diag::err_typecheck_decl_incomplete_type)) 6649 Var->setInvalidDecl(); 6650 6651 // Make sure that the type is not abstract. 6652 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6653 RequireNonAbstractType(Var->getLocation(), Type, 6654 diag::err_abstract_type_in_decl, 6655 AbstractVariableType)) 6656 Var->setInvalidDecl(); 6657 return; 6658 6659 case VarDecl::TentativeDefinition: 6660 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6661 // object that has file scope without an initializer, and without a 6662 // storage-class specifier or with the storage-class specifier "static", 6663 // constitutes a tentative definition. Note: A tentative definition with 6664 // external linkage is valid (C99 6.2.2p5). 6665 if (!Var->isInvalidDecl()) { 6666 if (const IncompleteArrayType *ArrayT 6667 = Context.getAsIncompleteArrayType(Type)) { 6668 if (RequireCompleteType(Var->getLocation(), 6669 ArrayT->getElementType(), 6670 diag::err_illegal_decl_array_incomplete_type)) 6671 Var->setInvalidDecl(); 6672 } else if (Var->getStorageClass() == SC_Static) { 6673 // C99 6.9.2p3: If the declaration of an identifier for an object is 6674 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6675 // declared type shall not be an incomplete type. 6676 // NOTE: code such as the following 6677 // static struct s; 6678 // struct s { int a; }; 6679 // is accepted by gcc. Hence here we issue a warning instead of 6680 // an error and we do not invalidate the static declaration. 6681 // NOTE: to avoid multiple warnings, only check the first declaration. 6682 if (Var->getPreviousDecl() == 0) 6683 RequireCompleteType(Var->getLocation(), Type, 6684 diag::ext_typecheck_decl_incomplete_type); 6685 } 6686 } 6687 6688 // Record the tentative definition; we're done. 6689 if (!Var->isInvalidDecl()) 6690 TentativeDefinitions.push_back(Var); 6691 return; 6692 } 6693 6694 // Provide a specific diagnostic for uninitialized variable 6695 // definitions with incomplete array type. 6696 if (Type->isIncompleteArrayType()) { 6697 Diag(Var->getLocation(), 6698 diag::err_typecheck_incomplete_array_needs_initializer); 6699 Var->setInvalidDecl(); 6700 return; 6701 } 6702 6703 // Provide a specific diagnostic for uninitialized variable 6704 // definitions with reference type. 6705 if (Type->isReferenceType()) { 6706 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6707 << Var->getDeclName() 6708 << SourceRange(Var->getLocation(), Var->getLocation()); 6709 Var->setInvalidDecl(); 6710 return; 6711 } 6712 6713 // Do not attempt to type-check the default initializer for a 6714 // variable with dependent type. 6715 if (Type->isDependentType()) 6716 return; 6717 6718 if (Var->isInvalidDecl()) 6719 return; 6720 6721 if (RequireCompleteType(Var->getLocation(), 6722 Context.getBaseElementType(Type), 6723 diag::err_typecheck_decl_incomplete_type)) { 6724 Var->setInvalidDecl(); 6725 return; 6726 } 6727 6728 // The variable can not have an abstract class type. 6729 if (RequireNonAbstractType(Var->getLocation(), Type, 6730 diag::err_abstract_type_in_decl, 6731 AbstractVariableType)) { 6732 Var->setInvalidDecl(); 6733 return; 6734 } 6735 6736 // Check for jumps past the implicit initializer. C++0x 6737 // clarifies that this applies to a "variable with automatic 6738 // storage duration", not a "local variable". 6739 // C++11 [stmt.dcl]p3 6740 // A program that jumps from a point where a variable with automatic 6741 // storage duration is not in scope to a point where it is in scope is 6742 // ill-formed unless the variable has scalar type, class type with a 6743 // trivial default constructor and a trivial destructor, a cv-qualified 6744 // version of one of these types, or an array of one of the preceding 6745 // types and is declared without an initializer. 6746 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) { 6747 if (const RecordType *Record 6748 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6749 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6750 // Mark the function for further checking even if the looser rules of 6751 // C++11 do not require such checks, so that we can diagnose 6752 // incompatibilities with C++98. 6753 if (!CXXRecord->isPOD()) 6754 getCurFunction()->setHasBranchProtectedScope(); 6755 } 6756 } 6757 6758 // C++03 [dcl.init]p9: 6759 // If no initializer is specified for an object, and the 6760 // object is of (possibly cv-qualified) non-POD class type (or 6761 // array thereof), the object shall be default-initialized; if 6762 // the object is of const-qualified type, the underlying class 6763 // type shall have a user-declared default 6764 // constructor. Otherwise, if no initializer is specified for 6765 // a non- static object, the object and its subobjects, if 6766 // any, have an indeterminate initial value); if the object 6767 // or any of its subobjects are of const-qualified type, the 6768 // program is ill-formed. 6769 // C++0x [dcl.init]p11: 6770 // If no initializer is specified for an object, the object is 6771 // default-initialized; [...]. 6772 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6773 InitializationKind Kind 6774 = InitializationKind::CreateDefault(Var->getLocation()); 6775 6776 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6777 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6778 MultiExprArg(*this, 0, 0)); 6779 if (Init.isInvalid()) 6780 Var->setInvalidDecl(); 6781 else if (Init.get()) { 6782 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6783 // This is important for template substitution. 6784 Var->setInitStyle(VarDecl::CallInit); 6785 } 6786 6787 CheckCompleteVariableDeclaration(Var); 6788 } 6789} 6790 6791void Sema::ActOnCXXForRangeDecl(Decl *D) { 6792 VarDecl *VD = dyn_cast<VarDecl>(D); 6793 if (!VD) { 6794 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6795 D->setInvalidDecl(); 6796 return; 6797 } 6798 6799 VD->setCXXForRangeDecl(true); 6800 6801 // for-range-declaration cannot be given a storage class specifier. 6802 int Error = -1; 6803 switch (VD->getStorageClassAsWritten()) { 6804 case SC_None: 6805 break; 6806 case SC_Extern: 6807 Error = 0; 6808 break; 6809 case SC_Static: 6810 Error = 1; 6811 break; 6812 case SC_PrivateExtern: 6813 Error = 2; 6814 break; 6815 case SC_Auto: 6816 Error = 3; 6817 break; 6818 case SC_Register: 6819 Error = 4; 6820 break; 6821 case SC_OpenCLWorkGroupLocal: 6822 llvm_unreachable("Unexpected storage class"); 6823 } 6824 if (VD->isConstexpr()) 6825 Error = 5; 6826 if (Error != -1) { 6827 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6828 << VD->getDeclName() << Error; 6829 D->setInvalidDecl(); 6830 } 6831} 6832 6833void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6834 if (var->isInvalidDecl()) return; 6835 6836 // In ARC, don't allow jumps past the implicit initialization of a 6837 // local retaining variable. 6838 if (getLangOpts().ObjCAutoRefCount && 6839 var->hasLocalStorage()) { 6840 switch (var->getType().getObjCLifetime()) { 6841 case Qualifiers::OCL_None: 6842 case Qualifiers::OCL_ExplicitNone: 6843 case Qualifiers::OCL_Autoreleasing: 6844 break; 6845 6846 case Qualifiers::OCL_Weak: 6847 case Qualifiers::OCL_Strong: 6848 getCurFunction()->setHasBranchProtectedScope(); 6849 break; 6850 } 6851 } 6852 6853 // All the following checks are C++ only. 6854 if (!getLangOpts().CPlusPlus) return; 6855 6856 QualType baseType = Context.getBaseElementType(var->getType()); 6857 if (baseType->isDependentType()) return; 6858 6859 // __block variables might require us to capture a copy-initializer. 6860 if (var->hasAttr<BlocksAttr>()) { 6861 // It's currently invalid to ever have a __block variable with an 6862 // array type; should we diagnose that here? 6863 6864 // Regardless, we don't want to ignore array nesting when 6865 // constructing this copy. 6866 QualType type = var->getType(); 6867 6868 if (type->isStructureOrClassType()) { 6869 SourceLocation poi = var->getLocation(); 6870 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi); 6871 ExprResult result = 6872 PerformCopyInitialization( 6873 InitializedEntity::InitializeBlock(poi, type, false), 6874 poi, Owned(varRef)); 6875 if (!result.isInvalid()) { 6876 result = MaybeCreateExprWithCleanups(result); 6877 Expr *init = result.takeAs<Expr>(); 6878 Context.setBlockVarCopyInits(var, init); 6879 } 6880 } 6881 } 6882 6883 Expr *Init = var->getInit(); 6884 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6885 6886 if (!var->getDeclContext()->isDependentContext() && Init) { 6887 if (IsGlobal && !var->isConstexpr() && 6888 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6889 var->getLocation()) 6890 != DiagnosticsEngine::Ignored && 6891 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6892 Diag(var->getLocation(), diag::warn_global_constructor) 6893 << Init->getSourceRange(); 6894 6895 if (var->isConstexpr()) { 6896 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6897 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6898 SourceLocation DiagLoc = var->getLocation(); 6899 // If the note doesn't add any useful information other than a source 6900 // location, fold it into the primary diagnostic. 6901 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6902 diag::note_invalid_subexpr_in_const_expr) { 6903 DiagLoc = Notes[0].first; 6904 Notes.clear(); 6905 } 6906 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6907 << var << Init->getSourceRange(); 6908 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6909 Diag(Notes[I].first, Notes[I].second); 6910 } 6911 } else if (var->isUsableInConstantExpressions(Context)) { 6912 // Check whether the initializer of a const variable of integral or 6913 // enumeration type is an ICE now, since we can't tell whether it was 6914 // initialized by a constant expression if we check later. 6915 var->checkInitIsICE(); 6916 } 6917 } 6918 6919 // Require the destructor. 6920 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6921 FinalizeVarWithDestructor(var, recordType); 6922} 6923 6924/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6925/// any semantic actions necessary after any initializer has been attached. 6926void 6927Sema::FinalizeDeclaration(Decl *ThisDecl) { 6928 // Note that we are no longer parsing the initializer for this declaration. 6929 ParsingInitForAutoVars.erase(ThisDecl); 6930} 6931 6932Sema::DeclGroupPtrTy 6933Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6934 Decl **Group, unsigned NumDecls) { 6935 SmallVector<Decl*, 8> Decls; 6936 6937 if (DS.isTypeSpecOwned()) 6938 Decls.push_back(DS.getRepAsDecl()); 6939 6940 for (unsigned i = 0; i != NumDecls; ++i) 6941 if (Decl *D = Group[i]) 6942 Decls.push_back(D); 6943 6944 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6945 DS.getTypeSpecType() == DeclSpec::TST_auto); 6946} 6947 6948/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6949/// group, performing any necessary semantic checking. 6950Sema::DeclGroupPtrTy 6951Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6952 bool TypeMayContainAuto) { 6953 // C++0x [dcl.spec.auto]p7: 6954 // If the type deduced for the template parameter U is not the same in each 6955 // deduction, the program is ill-formed. 6956 // FIXME: When initializer-list support is added, a distinction is needed 6957 // between the deduced type U and the deduced type which 'auto' stands for. 6958 // auto a = 0, b = { 1, 2, 3 }; 6959 // is legal because the deduced type U is 'int' in both cases. 6960 if (TypeMayContainAuto && NumDecls > 1) { 6961 QualType Deduced; 6962 CanQualType DeducedCanon; 6963 VarDecl *DeducedDecl = 0; 6964 for (unsigned i = 0; i != NumDecls; ++i) { 6965 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6966 AutoType *AT = D->getType()->getContainedAutoType(); 6967 // Don't reissue diagnostics when instantiating a template. 6968 if (AT && D->isInvalidDecl()) 6969 break; 6970 if (AT && AT->isDeduced()) { 6971 QualType U = AT->getDeducedType(); 6972 CanQualType UCanon = Context.getCanonicalType(U); 6973 if (Deduced.isNull()) { 6974 Deduced = U; 6975 DeducedCanon = UCanon; 6976 DeducedDecl = D; 6977 } else if (DeducedCanon != UCanon) { 6978 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6979 diag::err_auto_different_deductions) 6980 << Deduced << DeducedDecl->getDeclName() 6981 << U << D->getDeclName() 6982 << DeducedDecl->getInit()->getSourceRange() 6983 << D->getInit()->getSourceRange(); 6984 D->setInvalidDecl(); 6985 break; 6986 } 6987 } 6988 } 6989 } 6990 } 6991 6992 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6993} 6994 6995 6996/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6997/// to introduce parameters into function prototype scope. 6998Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6999 const DeclSpec &DS = D.getDeclSpec(); 7000 7001 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 7002 // C++03 [dcl.stc]p2 also permits 'auto'. 7003 VarDecl::StorageClass StorageClass = SC_None; 7004 VarDecl::StorageClass StorageClassAsWritten = SC_None; 7005 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 7006 StorageClass = SC_Register; 7007 StorageClassAsWritten = SC_Register; 7008 } else if (getLangOpts().CPlusPlus && 7009 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 7010 StorageClass = SC_Auto; 7011 StorageClassAsWritten = SC_Auto; 7012 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 7013 Diag(DS.getStorageClassSpecLoc(), 7014 diag::err_invalid_storage_class_in_func_decl); 7015 D.getMutableDeclSpec().ClearStorageClassSpecs(); 7016 } 7017 7018 if (D.getDeclSpec().isThreadSpecified()) 7019 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7020 if (D.getDeclSpec().isConstexprSpecified()) 7021 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 7022 << 0; 7023 7024 DiagnoseFunctionSpecifiers(D); 7025 7026 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7027 QualType parmDeclType = TInfo->getType(); 7028 7029 if (getLangOpts().CPlusPlus) { 7030 // Check that there are no default arguments inside the type of this 7031 // parameter. 7032 CheckExtraCXXDefaultArguments(D); 7033 7034 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 7035 if (D.getCXXScopeSpec().isSet()) { 7036 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 7037 << D.getCXXScopeSpec().getRange(); 7038 D.getCXXScopeSpec().clear(); 7039 } 7040 } 7041 7042 // Ensure we have a valid name 7043 IdentifierInfo *II = 0; 7044 if (D.hasName()) { 7045 II = D.getIdentifier(); 7046 if (!II) { 7047 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 7048 << GetNameForDeclarator(D).getName().getAsString(); 7049 D.setInvalidType(true); 7050 } 7051 } 7052 7053 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 7054 if (II) { 7055 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 7056 ForRedeclaration); 7057 LookupName(R, S); 7058 if (R.isSingleResult()) { 7059 NamedDecl *PrevDecl = R.getFoundDecl(); 7060 if (PrevDecl->isTemplateParameter()) { 7061 // Maybe we will complain about the shadowed template parameter. 7062 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7063 // Just pretend that we didn't see the previous declaration. 7064 PrevDecl = 0; 7065 } else if (S->isDeclScope(PrevDecl)) { 7066 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 7067 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7068 7069 // Recover by removing the name 7070 II = 0; 7071 D.SetIdentifier(0, D.getIdentifierLoc()); 7072 D.setInvalidType(true); 7073 } 7074 } 7075 } 7076 7077 // Temporarily put parameter variables in the translation unit, not 7078 // the enclosing context. This prevents them from accidentally 7079 // looking like class members in C++. 7080 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 7081 D.getLocStart(), 7082 D.getIdentifierLoc(), II, 7083 parmDeclType, TInfo, 7084 StorageClass, StorageClassAsWritten); 7085 7086 if (D.isInvalidType()) 7087 New->setInvalidDecl(); 7088 7089 assert(S->isFunctionPrototypeScope()); 7090 assert(S->getFunctionPrototypeDepth() >= 1); 7091 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 7092 S->getNextFunctionPrototypeIndex()); 7093 7094 // Add the parameter declaration into this scope. 7095 S->AddDecl(New); 7096 if (II) 7097 IdResolver.AddDecl(New); 7098 7099 ProcessDeclAttributes(S, New, D); 7100 7101 if (D.getDeclSpec().isModulePrivateSpecified()) 7102 Diag(New->getLocation(), diag::err_module_private_local) 7103 << 1 << New->getDeclName() 7104 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7105 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7106 7107 if (New->hasAttr<BlocksAttr>()) { 7108 Diag(New->getLocation(), diag::err_block_on_nonlocal); 7109 } 7110 return New; 7111} 7112 7113/// \brief Synthesizes a variable for a parameter arising from a 7114/// typedef. 7115ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 7116 SourceLocation Loc, 7117 QualType T) { 7118 /* FIXME: setting StartLoc == Loc. 7119 Would it be worth to modify callers so as to provide proper source 7120 location for the unnamed parameters, embedding the parameter's type? */ 7121 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 7122 T, Context.getTrivialTypeSourceInfo(T, Loc), 7123 SC_None, SC_None, 0); 7124 Param->setImplicit(); 7125 return Param; 7126} 7127 7128void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 7129 ParmVarDecl * const *ParamEnd) { 7130 // Don't diagnose unused-parameter errors in template instantiations; we 7131 // will already have done so in the template itself. 7132 if (!ActiveTemplateInstantiations.empty()) 7133 return; 7134 7135 for (; Param != ParamEnd; ++Param) { 7136 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 7137 !(*Param)->hasAttr<UnusedAttr>()) { 7138 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 7139 << (*Param)->getDeclName(); 7140 } 7141 } 7142} 7143 7144void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 7145 ParmVarDecl * const *ParamEnd, 7146 QualType ReturnTy, 7147 NamedDecl *D) { 7148 if (LangOpts.NumLargeByValueCopy == 0) // No check. 7149 return; 7150 7151 // Warn if the return value is pass-by-value and larger than the specified 7152 // threshold. 7153 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 7154 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 7155 if (Size > LangOpts.NumLargeByValueCopy) 7156 Diag(D->getLocation(), diag::warn_return_value_size) 7157 << D->getDeclName() << Size; 7158 } 7159 7160 // Warn if any parameter is pass-by-value and larger than the specified 7161 // threshold. 7162 for (; Param != ParamEnd; ++Param) { 7163 QualType T = (*Param)->getType(); 7164 if (T->isDependentType() || !T.isPODType(Context)) 7165 continue; 7166 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 7167 if (Size > LangOpts.NumLargeByValueCopy) 7168 Diag((*Param)->getLocation(), diag::warn_parameter_size) 7169 << (*Param)->getDeclName() << Size; 7170 } 7171} 7172 7173ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 7174 SourceLocation NameLoc, IdentifierInfo *Name, 7175 QualType T, TypeSourceInfo *TSInfo, 7176 VarDecl::StorageClass StorageClass, 7177 VarDecl::StorageClass StorageClassAsWritten) { 7178 // In ARC, infer a lifetime qualifier for appropriate parameter types. 7179 if (getLangOpts().ObjCAutoRefCount && 7180 T.getObjCLifetime() == Qualifiers::OCL_None && 7181 T->isObjCLifetimeType()) { 7182 7183 Qualifiers::ObjCLifetime lifetime; 7184 7185 // Special cases for arrays: 7186 // - if it's const, use __unsafe_unretained 7187 // - otherwise, it's an error 7188 if (T->isArrayType()) { 7189 if (!T.isConstQualified()) { 7190 DelayedDiagnostics.add( 7191 sema::DelayedDiagnostic::makeForbiddenType( 7192 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 7193 } 7194 lifetime = Qualifiers::OCL_ExplicitNone; 7195 } else { 7196 lifetime = T->getObjCARCImplicitLifetime(); 7197 } 7198 T = Context.getLifetimeQualifiedType(T, lifetime); 7199 } 7200 7201 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 7202 Context.getAdjustedParameterType(T), 7203 TSInfo, 7204 StorageClass, StorageClassAsWritten, 7205 0); 7206 7207 // Parameters can not be abstract class types. 7208 // For record types, this is done by the AbstractClassUsageDiagnoser once 7209 // the class has been completely parsed. 7210 if (!CurContext->isRecord() && 7211 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 7212 AbstractParamType)) 7213 New->setInvalidDecl(); 7214 7215 // Parameter declarators cannot be interface types. All ObjC objects are 7216 // passed by reference. 7217 if (T->isObjCObjectType()) { 7218 SourceLocation TypeEndLoc = TSInfo->getTypeLoc().getLocEnd(); 7219 Diag(NameLoc, 7220 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 7221 << FixItHint::CreateInsertion(TypeEndLoc, "*"); 7222 T = Context.getObjCObjectPointerType(T); 7223 New->setType(T); 7224 } 7225 7226 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 7227 // duration shall not be qualified by an address-space qualifier." 7228 // Since all parameters have automatic store duration, they can not have 7229 // an address space. 7230 if (T.getAddressSpace() != 0) { 7231 Diag(NameLoc, diag::err_arg_with_address_space); 7232 New->setInvalidDecl(); 7233 } 7234 7235 return New; 7236} 7237 7238void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 7239 SourceLocation LocAfterDecls) { 7240 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 7241 7242 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 7243 // for a K&R function. 7244 if (!FTI.hasPrototype) { 7245 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 7246 --i; 7247 if (FTI.ArgInfo[i].Param == 0) { 7248 SmallString<256> Code; 7249 llvm::raw_svector_ostream(Code) << " int " 7250 << FTI.ArgInfo[i].Ident->getName() 7251 << ";\n"; 7252 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 7253 << FTI.ArgInfo[i].Ident 7254 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 7255 7256 // Implicitly declare the argument as type 'int' for lack of a better 7257 // type. 7258 AttributeFactory attrs; 7259 DeclSpec DS(attrs); 7260 const char* PrevSpec; // unused 7261 unsigned DiagID; // unused 7262 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 7263 PrevSpec, DiagID); 7264 Declarator ParamD(DS, Declarator::KNRTypeListContext); 7265 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 7266 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 7267 } 7268 } 7269 } 7270} 7271 7272Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 7273 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 7274 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 7275 Scope *ParentScope = FnBodyScope->getParent(); 7276 7277 D.setFunctionDefinitionKind(FDK_Definition); 7278 Decl *DP = HandleDeclarator(ParentScope, D, 7279 MultiTemplateParamsArg(*this)); 7280 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7281} 7282 7283static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7284 // Don't warn about invalid declarations. 7285 if (FD->isInvalidDecl()) 7286 return false; 7287 7288 // Or declarations that aren't global. 7289 if (!FD->isGlobal()) 7290 return false; 7291 7292 // Don't warn about C++ member functions. 7293 if (isa<CXXMethodDecl>(FD)) 7294 return false; 7295 7296 // Don't warn about 'main'. 7297 if (FD->isMain()) 7298 return false; 7299 7300 // Don't warn about inline functions. 7301 if (FD->isInlined()) 7302 return false; 7303 7304 // Don't warn about function templates. 7305 if (FD->getDescribedFunctionTemplate()) 7306 return false; 7307 7308 // Don't warn about function template specializations. 7309 if (FD->isFunctionTemplateSpecialization()) 7310 return false; 7311 7312 bool MissingPrototype = true; 7313 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7314 Prev; Prev = Prev->getPreviousDecl()) { 7315 // Ignore any declarations that occur in function or method 7316 // scope, because they aren't visible from the header. 7317 if (Prev->getDeclContext()->isFunctionOrMethod()) 7318 continue; 7319 7320 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7321 break; 7322 } 7323 7324 return MissingPrototype; 7325} 7326 7327void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7328 // Don't complain if we're in GNU89 mode and the previous definition 7329 // was an extern inline function. 7330 const FunctionDecl *Definition; 7331 if (FD->isDefined(Definition) && 7332 !canRedefineFunction(Definition, getLangOpts())) { 7333 if (getLangOpts().GNUMode && Definition->isInlineSpecified() && 7334 Definition->getStorageClass() == SC_Extern) 7335 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7336 << FD->getDeclName() << getLangOpts().CPlusPlus; 7337 else 7338 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7339 Diag(Definition->getLocation(), diag::note_previous_definition); 7340 } 7341} 7342 7343Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7344 // Clear the last template instantiation error context. 7345 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7346 7347 if (!D) 7348 return D; 7349 FunctionDecl *FD = 0; 7350 7351 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7352 FD = FunTmpl->getTemplatedDecl(); 7353 else 7354 FD = cast<FunctionDecl>(D); 7355 7356 // Enter a new function scope 7357 PushFunctionScope(); 7358 7359 // See if this is a redefinition. 7360 if (!FD->isLateTemplateParsed()) 7361 CheckForFunctionRedefinition(FD); 7362 7363 // Builtin functions cannot be defined. 7364 if (unsigned BuiltinID = FD->getBuiltinID()) { 7365 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7366 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7367 FD->setInvalidDecl(); 7368 } 7369 } 7370 7371 // The return type of a function definition must be complete 7372 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7373 QualType ResultType = FD->getResultType(); 7374 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7375 !FD->isInvalidDecl() && 7376 RequireCompleteType(FD->getLocation(), ResultType, 7377 diag::err_func_def_incomplete_result)) 7378 FD->setInvalidDecl(); 7379 7380 // GNU warning -Wmissing-prototypes: 7381 // Warn if a global function is defined without a previous 7382 // prototype declaration. This warning is issued even if the 7383 // definition itself provides a prototype. The aim is to detect 7384 // global functions that fail to be declared in header files. 7385 if (ShouldWarnAboutMissingPrototype(FD)) 7386 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7387 7388 if (FnBodyScope) 7389 PushDeclContext(FnBodyScope, FD); 7390 7391 // Check the validity of our function parameters 7392 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7393 /*CheckParameterNames=*/true); 7394 7395 // Introduce our parameters into the function scope 7396 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7397 ParmVarDecl *Param = FD->getParamDecl(p); 7398 Param->setOwningFunction(FD); 7399 7400 // If this has an identifier, add it to the scope stack. 7401 if (Param->getIdentifier() && FnBodyScope) { 7402 CheckShadow(FnBodyScope, Param); 7403 7404 PushOnScopeChains(Param, FnBodyScope); 7405 } 7406 } 7407 7408 // If we had any tags defined in the function prototype, 7409 // introduce them into the function scope. 7410 if (FnBodyScope) { 7411 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(), 7412 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) { 7413 NamedDecl *D = *I; 7414 7415 // Some of these decls (like enums) may have been pinned to the translation unit 7416 // for lack of a real context earlier. If so, remove from the translation unit 7417 // and reattach to the current context. 7418 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) { 7419 // Is the decl actually in the context? 7420 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(), 7421 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) { 7422 if (*DI == D) { 7423 Context.getTranslationUnitDecl()->removeDecl(D); 7424 break; 7425 } 7426 } 7427 // Either way, reassign the lexical decl context to our FunctionDecl. 7428 D->setLexicalDeclContext(CurContext); 7429 } 7430 7431 // If the decl has a non-null name, make accessible in the current scope. 7432 if (!D->getName().empty()) 7433 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false); 7434 7435 // Similarly, dive into enums and fish their constants out, making them 7436 // accessible in this scope. 7437 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) { 7438 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(), 7439 EE = ED->enumerator_end(); EI != EE; ++EI) 7440 PushOnScopeChains(&*EI, FnBodyScope, /*AddToContext=*/false); 7441 } 7442 } 7443 } 7444 7445 // Ensure that the function's exception specification is instantiated. 7446 if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>()) 7447 ResolveExceptionSpec(D->getLocation(), FPT); 7448 7449 // Checking attributes of current function definition 7450 // dllimport attribute. 7451 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7452 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7453 // dllimport attribute cannot be directly applied to definition. 7454 // Microsoft accepts dllimport for functions defined within class scope. 7455 if (!DA->isInherited() && 7456 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7457 Diag(FD->getLocation(), 7458 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7459 << "dllimport"; 7460 FD->setInvalidDecl(); 7461 return FD; 7462 } 7463 7464 // Visual C++ appears to not think this is an issue, so only issue 7465 // a warning when Microsoft extensions are disabled. 7466 if (!LangOpts.MicrosoftExt) { 7467 // If a symbol previously declared dllimport is later defined, the 7468 // attribute is ignored in subsequent references, and a warning is 7469 // emitted. 7470 Diag(FD->getLocation(), 7471 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7472 << FD->getName() << "dllimport"; 7473 } 7474 } 7475 return FD; 7476} 7477 7478/// \brief Given the set of return statements within a function body, 7479/// compute the variables that are subject to the named return value 7480/// optimization. 7481/// 7482/// Each of the variables that is subject to the named return value 7483/// optimization will be marked as NRVO variables in the AST, and any 7484/// return statement that has a marked NRVO variable as its NRVO candidate can 7485/// use the named return value optimization. 7486/// 7487/// This function applies a very simplistic algorithm for NRVO: if every return 7488/// statement in the function has the same NRVO candidate, that candidate is 7489/// the NRVO variable. 7490/// 7491/// FIXME: Employ a smarter algorithm that accounts for multiple return 7492/// statements and the lifetimes of the NRVO candidates. We should be able to 7493/// find a maximal set of NRVO variables. 7494void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7495 ReturnStmt **Returns = Scope->Returns.data(); 7496 7497 const VarDecl *NRVOCandidate = 0; 7498 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7499 if (!Returns[I]->getNRVOCandidate()) 7500 return; 7501 7502 if (!NRVOCandidate) 7503 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7504 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7505 return; 7506 } 7507 7508 if (NRVOCandidate) 7509 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7510} 7511 7512Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7513 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7514} 7515 7516Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7517 bool IsInstantiation) { 7518 FunctionDecl *FD = 0; 7519 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7520 if (FunTmpl) 7521 FD = FunTmpl->getTemplatedDecl(); 7522 else 7523 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7524 7525 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7526 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7527 7528 if (FD) { 7529 FD->setBody(Body); 7530 7531 // If the function implicitly returns zero (like 'main') or is naked, 7532 // don't complain about missing return statements. 7533 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) 7534 WP.disableCheckFallThrough(); 7535 7536 // MSVC permits the use of pure specifier (=0) on function definition, 7537 // defined at class scope, warn about this non standard construct. 7538 if (getLangOpts().MicrosoftExt && FD->isPure()) 7539 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7540 7541 if (!FD->isInvalidDecl()) { 7542 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7543 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7544 FD->getResultType(), FD); 7545 7546 // If this is a constructor, we need a vtable. 7547 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7548 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7549 7550 computeNRVO(Body, getCurFunction()); 7551 } 7552 7553 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 7554 "Function parsing confused"); 7555 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7556 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7557 MD->setBody(Body); 7558 if (Body) 7559 MD->setEndLoc(Body->getLocEnd()); 7560 if (!MD->isInvalidDecl()) { 7561 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7562 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7563 MD->getResultType(), MD); 7564 7565 if (Body) 7566 computeNRVO(Body, getCurFunction()); 7567 } 7568 if (ObjCShouldCallSuperDealloc) { 7569 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7570 ObjCShouldCallSuperDealloc = false; 7571 } 7572 if (ObjCShouldCallSuperFinalize) { 7573 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7574 ObjCShouldCallSuperFinalize = false; 7575 } 7576 } else { 7577 return 0; 7578 } 7579 7580 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7581 "ObjC methods, which should have been handled in the block above."); 7582 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7583 "ObjC methods, which should have been handled in the block above."); 7584 7585 // Verify and clean out per-function state. 7586 if (Body) { 7587 // C++ constructors that have function-try-blocks can't have return 7588 // statements in the handlers of that block. (C++ [except.handle]p14) 7589 // Verify this. 7590 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7591 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7592 7593 // Verify that gotos and switch cases don't jump into scopes illegally. 7594 if (getCurFunction()->NeedsScopeChecking() && 7595 !dcl->isInvalidDecl() && 7596 !hasAnyUnrecoverableErrorsInThisFunction()) 7597 DiagnoseInvalidJumps(Body); 7598 7599 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7600 if (!Destructor->getParent()->isDependentType()) 7601 CheckDestructor(Destructor); 7602 7603 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7604 Destructor->getParent()); 7605 } 7606 7607 // If any errors have occurred, clear out any temporaries that may have 7608 // been leftover. This ensures that these temporaries won't be picked up for 7609 // deletion in some later function. 7610 if (PP.getDiagnostics().hasErrorOccurred() || 7611 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7612 DiscardCleanupsInEvaluationContext(); 7613 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7614 // Since the body is valid, issue any analysis-based warnings that are 7615 // enabled. 7616 ActivePolicy = &WP; 7617 } 7618 7619 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7620 (!CheckConstexprFunctionDecl(FD) || 7621 !CheckConstexprFunctionBody(FD, Body))) 7622 FD->setInvalidDecl(); 7623 7624 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7625 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7626 assert(MaybeODRUseExprs.empty() && 7627 "Leftover expressions for odr-use checking"); 7628 } 7629 7630 if (!IsInstantiation) 7631 PopDeclContext(); 7632 7633 PopFunctionScopeInfo(ActivePolicy, dcl); 7634 7635 // If any errors have occurred, clear out any temporaries that may have 7636 // been leftover. This ensures that these temporaries won't be picked up for 7637 // deletion in some later function. 7638 if (getDiagnostics().hasErrorOccurred()) { 7639 DiscardCleanupsInEvaluationContext(); 7640 } 7641 7642 return dcl; 7643} 7644 7645 7646/// When we finish delayed parsing of an attribute, we must attach it to the 7647/// relevant Decl. 7648void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7649 ParsedAttributes &Attrs) { 7650 // Always attach attributes to the underlying decl. 7651 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7652 D = TD->getTemplatedDecl(); 7653 ProcessDeclAttributeList(S, D, Attrs.getList()); 7654 7655 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D)) 7656 if (Method->isStatic()) 7657 checkThisInStaticMemberFunctionAttributes(Method); 7658} 7659 7660 7661/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7662/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7663NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7664 IdentifierInfo &II, Scope *S) { 7665 // Before we produce a declaration for an implicitly defined 7666 // function, see whether there was a locally-scoped declaration of 7667 // this name as a function or variable. If so, use that 7668 // (non-visible) declaration, and complain about it. 7669 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7670 = findLocallyScopedExternalDecl(&II); 7671 if (Pos != LocallyScopedExternalDecls.end()) { 7672 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7673 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7674 return Pos->second; 7675 } 7676 7677 // Extension in C99. Legal in C90, but warn about it. 7678 unsigned diag_id; 7679 if (II.getName().startswith("__builtin_")) 7680 diag_id = diag::warn_builtin_unknown; 7681 else if (getLangOpts().C99) 7682 diag_id = diag::ext_implicit_function_decl; 7683 else 7684 diag_id = diag::warn_implicit_function_decl; 7685 Diag(Loc, diag_id) << &II; 7686 7687 // Because typo correction is expensive, only do it if the implicit 7688 // function declaration is going to be treated as an error. 7689 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7690 TypoCorrection Corrected; 7691 DeclFilterCCC<FunctionDecl> Validator; 7692 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7693 LookupOrdinaryName, S, 0, Validator))) { 7694 std::string CorrectedStr = Corrected.getAsString(getLangOpts()); 7695 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts()); 7696 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7697 7698 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7699 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7700 7701 if (Func->getLocation().isValid() 7702 && !II.getName().startswith("__builtin_")) 7703 Diag(Func->getLocation(), diag::note_previous_decl) 7704 << CorrectedQuotedStr; 7705 } 7706 } 7707 7708 // Set a Declarator for the implicit definition: int foo(); 7709 const char *Dummy; 7710 AttributeFactory attrFactory; 7711 DeclSpec DS(attrFactory); 7712 unsigned DiagID; 7713 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7714 (void)Error; // Silence warning. 7715 assert(!Error && "Error setting up implicit decl!"); 7716 Declarator D(DS, Declarator::BlockContext); 7717 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7718 0, 0, true, SourceLocation(), 7719 SourceLocation(), SourceLocation(), 7720 SourceLocation(), 7721 EST_None, SourceLocation(), 7722 0, 0, 0, 0, Loc, Loc, D), 7723 DS.getAttributes(), 7724 SourceLocation()); 7725 D.SetIdentifier(&II, Loc); 7726 7727 // Insert this function into translation-unit scope. 7728 7729 DeclContext *PrevDC = CurContext; 7730 CurContext = Context.getTranslationUnitDecl(); 7731 7732 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7733 FD->setImplicit(); 7734 7735 CurContext = PrevDC; 7736 7737 AddKnownFunctionAttributes(FD); 7738 7739 return FD; 7740} 7741 7742/// \brief Adds any function attributes that we know a priori based on 7743/// the declaration of this function. 7744/// 7745/// These attributes can apply both to implicitly-declared builtins 7746/// (like __builtin___printf_chk) or to library-declared functions 7747/// like NSLog or printf. 7748/// 7749/// We need to check for duplicate attributes both here and where user-written 7750/// attributes are applied to declarations. 7751void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7752 if (FD->isInvalidDecl()) 7753 return; 7754 7755 // If this is a built-in function, map its builtin attributes to 7756 // actual attributes. 7757 if (unsigned BuiltinID = FD->getBuiltinID()) { 7758 // Handle printf-formatting attributes. 7759 unsigned FormatIdx; 7760 bool HasVAListArg; 7761 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7762 if (!FD->getAttr<FormatAttr>()) { 7763 const char *fmt = "printf"; 7764 unsigned int NumParams = FD->getNumParams(); 7765 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7766 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7767 fmt = "NSString"; 7768 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7769 fmt, FormatIdx+1, 7770 HasVAListArg ? 0 : FormatIdx+2)); 7771 } 7772 } 7773 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7774 HasVAListArg)) { 7775 if (!FD->getAttr<FormatAttr>()) 7776 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7777 "scanf", FormatIdx+1, 7778 HasVAListArg ? 0 : FormatIdx+2)); 7779 } 7780 7781 // Mark const if we don't care about errno and that is the only 7782 // thing preventing the function from being const. This allows 7783 // IRgen to use LLVM intrinsics for such functions. 7784 if (!getLangOpts().MathErrno && 7785 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7786 if (!FD->getAttr<ConstAttr>()) 7787 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7788 } 7789 7790 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7791 !FD->getAttr<ReturnsTwiceAttr>()) 7792 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7793 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7794 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7795 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7796 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7797 } 7798 7799 IdentifierInfo *Name = FD->getIdentifier(); 7800 if (!Name) 7801 return; 7802 if ((!getLangOpts().CPlusPlus && 7803 FD->getDeclContext()->isTranslationUnit()) || 7804 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7805 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7806 LinkageSpecDecl::lang_c)) { 7807 // Okay: this could be a libc/libm/Objective-C function we know 7808 // about. 7809 } else 7810 return; 7811 7812 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7813 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7814 // target-specific builtins, perhaps? 7815 if (!FD->getAttr<FormatAttr>()) 7816 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7817 "printf", 2, 7818 Name->isStr("vasprintf") ? 0 : 3)); 7819 } 7820} 7821 7822TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7823 TypeSourceInfo *TInfo) { 7824 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7825 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7826 7827 if (!TInfo) { 7828 assert(D.isInvalidType() && "no declarator info for valid type"); 7829 TInfo = Context.getTrivialTypeSourceInfo(T); 7830 } 7831 7832 // Scope manipulation handled by caller. 7833 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7834 D.getLocStart(), 7835 D.getIdentifierLoc(), 7836 D.getIdentifier(), 7837 TInfo); 7838 7839 // Bail out immediately if we have an invalid declaration. 7840 if (D.isInvalidType()) { 7841 NewTD->setInvalidDecl(); 7842 return NewTD; 7843 } 7844 7845 if (D.getDeclSpec().isModulePrivateSpecified()) { 7846 if (CurContext->isFunctionOrMethod()) 7847 Diag(NewTD->getLocation(), diag::err_module_private_local) 7848 << 2 << NewTD->getDeclName() 7849 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7850 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7851 else 7852 NewTD->setModulePrivate(); 7853 } 7854 7855 // C++ [dcl.typedef]p8: 7856 // If the typedef declaration defines an unnamed class (or 7857 // enum), the first typedef-name declared by the declaration 7858 // to be that class type (or enum type) is used to denote the 7859 // class type (or enum type) for linkage purposes only. 7860 // We need to check whether the type was declared in the declaration. 7861 switch (D.getDeclSpec().getTypeSpecType()) { 7862 case TST_enum: 7863 case TST_struct: 7864 case TST_union: 7865 case TST_class: { 7866 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7867 7868 // Do nothing if the tag is not anonymous or already has an 7869 // associated typedef (from an earlier typedef in this decl group). 7870 if (tagFromDeclSpec->getIdentifier()) break; 7871 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7872 7873 // A well-formed anonymous tag must always be a TUK_Definition. 7874 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7875 7876 // The type must match the tag exactly; no qualifiers allowed. 7877 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7878 break; 7879 7880 // Otherwise, set this is the anon-decl typedef for the tag. 7881 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7882 break; 7883 } 7884 7885 default: 7886 break; 7887 } 7888 7889 return NewTD; 7890} 7891 7892 7893/// \brief Check that this is a valid underlying type for an enum declaration. 7894bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) { 7895 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7896 QualType T = TI->getType(); 7897 7898 if (T->isDependentType() || T->isIntegralType(Context)) 7899 return false; 7900 7901 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T; 7902 return true; 7903} 7904 7905/// Check whether this is a valid redeclaration of a previous enumeration. 7906/// \return true if the redeclaration was invalid. 7907bool Sema::CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped, 7908 QualType EnumUnderlyingTy, 7909 const EnumDecl *Prev) { 7910 bool IsFixed = !EnumUnderlyingTy.isNull(); 7911 7912 if (IsScoped != Prev->isScoped()) { 7913 Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch) 7914 << Prev->isScoped(); 7915 Diag(Prev->getLocation(), diag::note_previous_use); 7916 return true; 7917 } 7918 7919 if (IsFixed && Prev->isFixed()) { 7920 if (!EnumUnderlyingTy->isDependentType() && 7921 !Prev->getIntegerType()->isDependentType() && 7922 !Context.hasSameUnqualifiedType(EnumUnderlyingTy, 7923 Prev->getIntegerType())) { 7924 Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch) 7925 << EnumUnderlyingTy << Prev->getIntegerType(); 7926 Diag(Prev->getLocation(), diag::note_previous_use); 7927 return true; 7928 } 7929 } else if (IsFixed != Prev->isFixed()) { 7930 Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch) 7931 << Prev->isFixed(); 7932 Diag(Prev->getLocation(), diag::note_previous_use); 7933 return true; 7934 } 7935 7936 return false; 7937} 7938 7939/// \brief Determine whether a tag with a given kind is acceptable 7940/// as a redeclaration of the given tag declaration. 7941/// 7942/// \returns true if the new tag kind is acceptable, false otherwise. 7943bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7944 TagTypeKind NewTag, bool isDefinition, 7945 SourceLocation NewTagLoc, 7946 const IdentifierInfo &Name) { 7947 // C++ [dcl.type.elab]p3: 7948 // The class-key or enum keyword present in the 7949 // elaborated-type-specifier shall agree in kind with the 7950 // declaration to which the name in the elaborated-type-specifier 7951 // refers. This rule also applies to the form of 7952 // elaborated-type-specifier that declares a class-name or 7953 // friend class since it can be construed as referring to the 7954 // definition of the class. Thus, in any 7955 // elaborated-type-specifier, the enum keyword shall be used to 7956 // refer to an enumeration (7.2), the union class-key shall be 7957 // used to refer to a union (clause 9), and either the class or 7958 // struct class-key shall be used to refer to a class (clause 9) 7959 // declared using the class or struct class-key. 7960 TagTypeKind OldTag = Previous->getTagKind(); 7961 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7962 if (OldTag == NewTag) 7963 return true; 7964 7965 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7966 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7967 // Warn about the struct/class tag mismatch. 7968 bool isTemplate = false; 7969 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7970 isTemplate = Record->getDescribedClassTemplate(); 7971 7972 if (!ActiveTemplateInstantiations.empty()) { 7973 // In a template instantiation, do not offer fix-its for tag mismatches 7974 // since they usually mess up the template instead of fixing the problem. 7975 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7976 << (NewTag == TTK_Class) << isTemplate << &Name; 7977 return true; 7978 } 7979 7980 if (isDefinition) { 7981 // On definitions, check previous tags and issue a fix-it for each 7982 // one that doesn't match the current tag. 7983 if (Previous->getDefinition()) { 7984 // Don't suggest fix-its for redefinitions. 7985 return true; 7986 } 7987 7988 bool previousMismatch = false; 7989 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7990 E(Previous->redecls_end()); I != E; ++I) { 7991 if (I->getTagKind() != NewTag) { 7992 if (!previousMismatch) { 7993 previousMismatch = true; 7994 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7995 << (NewTag == TTK_Class) << isTemplate << &Name; 7996 } 7997 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7998 << (NewTag == TTK_Class) 7999 << FixItHint::CreateReplacement(I->getInnerLocStart(), 8000 NewTag == TTK_Class? 8001 "class" : "struct"); 8002 } 8003 } 8004 return true; 8005 } 8006 8007 // Check for a previous definition. If current tag and definition 8008 // are same type, do nothing. If no definition, but disagree with 8009 // with previous tag type, give a warning, but no fix-it. 8010 const TagDecl *Redecl = Previous->getDefinition() ? 8011 Previous->getDefinition() : Previous; 8012 if (Redecl->getTagKind() == NewTag) { 8013 return true; 8014 } 8015 8016 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 8017 << (NewTag == TTK_Class) 8018 << isTemplate << &Name; 8019 Diag(Redecl->getLocation(), diag::note_previous_use); 8020 8021 // If there is a previous defintion, suggest a fix-it. 8022 if (Previous->getDefinition()) { 8023 Diag(NewTagLoc, diag::note_struct_class_suggestion) 8024 << (Redecl->getTagKind() == TTK_Class) 8025 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 8026 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 8027 } 8028 8029 return true; 8030 } 8031 return false; 8032} 8033 8034/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 8035/// former case, Name will be non-null. In the later case, Name will be null. 8036/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 8037/// reference/declaration/definition of a tag. 8038Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 8039 SourceLocation KWLoc, CXXScopeSpec &SS, 8040 IdentifierInfo *Name, SourceLocation NameLoc, 8041 AttributeList *Attr, AccessSpecifier AS, 8042 SourceLocation ModulePrivateLoc, 8043 MultiTemplateParamsArg TemplateParameterLists, 8044 bool &OwnedDecl, bool &IsDependent, 8045 SourceLocation ScopedEnumKWLoc, 8046 bool ScopedEnumUsesClassTag, 8047 TypeResult UnderlyingType) { 8048 // If this is not a definition, it must have a name. 8049 IdentifierInfo *OrigName = Name; 8050 assert((Name != 0 || TUK == TUK_Definition) && 8051 "Nameless record must be a definition!"); 8052 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 8053 8054 OwnedDecl = false; 8055 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8056 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 8057 8058 // FIXME: Check explicit specializations more carefully. 8059 bool isExplicitSpecialization = false; 8060 bool Invalid = false; 8061 8062 // We only need to do this matching if we have template parameters 8063 // or a scope specifier, which also conveniently avoids this work 8064 // for non-C++ cases. 8065 if (TemplateParameterLists.size() > 0 || 8066 (SS.isNotEmpty() && TUK != TUK_Reference)) { 8067 if (TemplateParameterList *TemplateParams 8068 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 8069 TemplateParameterLists.get(), 8070 TemplateParameterLists.size(), 8071 TUK == TUK_Friend, 8072 isExplicitSpecialization, 8073 Invalid)) { 8074 if (TemplateParams->size() > 0) { 8075 // This is a declaration or definition of a class template (which may 8076 // be a member of another template). 8077 8078 if (Invalid) 8079 return 0; 8080 8081 OwnedDecl = false; 8082 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 8083 SS, Name, NameLoc, Attr, 8084 TemplateParams, AS, 8085 ModulePrivateLoc, 8086 TemplateParameterLists.size() - 1, 8087 (TemplateParameterList**) TemplateParameterLists.release()); 8088 return Result.get(); 8089 } else { 8090 // The "template<>" header is extraneous. 8091 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8092 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8093 isExplicitSpecialization = true; 8094 } 8095 } 8096 } 8097 8098 // Figure out the underlying type if this a enum declaration. We need to do 8099 // this early, because it's needed to detect if this is an incompatible 8100 // redeclaration. 8101 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 8102 8103 if (Kind == TTK_Enum) { 8104 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 8105 // No underlying type explicitly specified, or we failed to parse the 8106 // type, default to int. 8107 EnumUnderlying = Context.IntTy.getTypePtr(); 8108 else if (UnderlyingType.get()) { 8109 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 8110 // integral type; any cv-qualification is ignored. 8111 TypeSourceInfo *TI = 0; 8112 GetTypeFromParser(UnderlyingType.get(), &TI); 8113 EnumUnderlying = TI; 8114 8115 if (CheckEnumUnderlyingType(TI)) 8116 // Recover by falling back to int. 8117 EnumUnderlying = Context.IntTy.getTypePtr(); 8118 8119 if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI, 8120 UPPC_FixedUnderlyingType)) 8121 EnumUnderlying = Context.IntTy.getTypePtr(); 8122 8123 } else if (getLangOpts().MicrosoftMode) 8124 // Microsoft enums are always of int type. 8125 EnumUnderlying = Context.IntTy.getTypePtr(); 8126 } 8127 8128 DeclContext *SearchDC = CurContext; 8129 DeclContext *DC = CurContext; 8130 bool isStdBadAlloc = false; 8131 8132 RedeclarationKind Redecl = ForRedeclaration; 8133 if (TUK == TUK_Friend || TUK == TUK_Reference) 8134 Redecl = NotForRedeclaration; 8135 8136 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 8137 8138 if (Name && SS.isNotEmpty()) { 8139 // We have a nested-name tag ('struct foo::bar'). 8140 8141 // Check for invalid 'foo::'. 8142 if (SS.isInvalid()) { 8143 Name = 0; 8144 goto CreateNewDecl; 8145 } 8146 8147 // If this is a friend or a reference to a class in a dependent 8148 // context, don't try to make a decl for it. 8149 if (TUK == TUK_Friend || TUK == TUK_Reference) { 8150 DC = computeDeclContext(SS, false); 8151 if (!DC) { 8152 IsDependent = true; 8153 return 0; 8154 } 8155 } else { 8156 DC = computeDeclContext(SS, true); 8157 if (!DC) { 8158 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 8159 << SS.getRange(); 8160 return 0; 8161 } 8162 } 8163 8164 if (RequireCompleteDeclContext(SS, DC)) 8165 return 0; 8166 8167 SearchDC = DC; 8168 // Look-up name inside 'foo::'. 8169 LookupQualifiedName(Previous, DC); 8170 8171 if (Previous.isAmbiguous()) 8172 return 0; 8173 8174 if (Previous.empty()) { 8175 // Name lookup did not find anything. However, if the 8176 // nested-name-specifier refers to the current instantiation, 8177 // and that current instantiation has any dependent base 8178 // classes, we might find something at instantiation time: treat 8179 // this as a dependent elaborated-type-specifier. 8180 // But this only makes any sense for reference-like lookups. 8181 if (Previous.wasNotFoundInCurrentInstantiation() && 8182 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8183 IsDependent = true; 8184 return 0; 8185 } 8186 8187 // A tag 'foo::bar' must already exist. 8188 Diag(NameLoc, diag::err_not_tag_in_scope) 8189 << Kind << Name << DC << SS.getRange(); 8190 Name = 0; 8191 Invalid = true; 8192 goto CreateNewDecl; 8193 } 8194 } else if (Name) { 8195 // If this is a named struct, check to see if there was a previous forward 8196 // declaration or definition. 8197 // FIXME: We're looking into outer scopes here, even when we 8198 // shouldn't be. Doing so can result in ambiguities that we 8199 // shouldn't be diagnosing. 8200 LookupName(Previous, S); 8201 8202 if (Previous.isAmbiguous() && 8203 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 8204 LookupResult::Filter F = Previous.makeFilter(); 8205 while (F.hasNext()) { 8206 NamedDecl *ND = F.next(); 8207 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 8208 F.erase(); 8209 } 8210 F.done(); 8211 } 8212 8213 // Note: there used to be some attempt at recovery here. 8214 if (Previous.isAmbiguous()) 8215 return 0; 8216 8217 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) { 8218 // FIXME: This makes sure that we ignore the contexts associated 8219 // with C structs, unions, and enums when looking for a matching 8220 // tag declaration or definition. See the similar lookup tweak 8221 // in Sema::LookupName; is there a better way to deal with this? 8222 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 8223 SearchDC = SearchDC->getParent(); 8224 } 8225 } else if (S->isFunctionPrototypeScope()) { 8226 // If this is an enum declaration in function prototype scope, set its 8227 // initial context to the translation unit. 8228 // FIXME: [citation needed] 8229 SearchDC = Context.getTranslationUnitDecl(); 8230 } 8231 8232 if (Previous.isSingleResult() && 8233 Previous.getFoundDecl()->isTemplateParameter()) { 8234 // Maybe we will complain about the shadowed template parameter. 8235 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 8236 // Just pretend that we didn't see the previous declaration. 8237 Previous.clear(); 8238 } 8239 8240 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace && 8241 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 8242 // This is a declaration of or a reference to "std::bad_alloc". 8243 isStdBadAlloc = true; 8244 8245 if (Previous.empty() && StdBadAlloc) { 8246 // std::bad_alloc has been implicitly declared (but made invisible to 8247 // name lookup). Fill in this implicit declaration as the previous 8248 // declaration, so that the declarations get chained appropriately. 8249 Previous.addDecl(getStdBadAlloc()); 8250 } 8251 } 8252 8253 // If we didn't find a previous declaration, and this is a reference 8254 // (or friend reference), move to the correct scope. In C++, we 8255 // also need to do a redeclaration lookup there, just in case 8256 // there's a shadow friend decl. 8257 if (Name && Previous.empty() && 8258 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8259 if (Invalid) goto CreateNewDecl; 8260 assert(SS.isEmpty()); 8261 8262 if (TUK == TUK_Reference) { 8263 // C++ [basic.scope.pdecl]p5: 8264 // -- for an elaborated-type-specifier of the form 8265 // 8266 // class-key identifier 8267 // 8268 // if the elaborated-type-specifier is used in the 8269 // decl-specifier-seq or parameter-declaration-clause of a 8270 // function defined in namespace scope, the identifier is 8271 // declared as a class-name in the namespace that contains 8272 // the declaration; otherwise, except as a friend 8273 // declaration, the identifier is declared in the smallest 8274 // non-class, non-function-prototype scope that contains the 8275 // declaration. 8276 // 8277 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 8278 // C structs and unions. 8279 // 8280 // It is an error in C++ to declare (rather than define) an enum 8281 // type, including via an elaborated type specifier. We'll 8282 // diagnose that later; for now, declare the enum in the same 8283 // scope as we would have picked for any other tag type. 8284 // 8285 // GNU C also supports this behavior as part of its incomplete 8286 // enum types extension, while GNU C++ does not. 8287 // 8288 // Find the context where we'll be declaring the tag. 8289 // FIXME: We would like to maintain the current DeclContext as the 8290 // lexical context, 8291 while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod()) 8292 SearchDC = SearchDC->getParent(); 8293 8294 // Find the scope where we'll be declaring the tag. 8295 while (S->isClassScope() || 8296 (getLangOpts().CPlusPlus && 8297 S->isFunctionPrototypeScope()) || 8298 ((S->getFlags() & Scope::DeclScope) == 0) || 8299 (S->getEntity() && 8300 ((DeclContext *)S->getEntity())->isTransparentContext())) 8301 S = S->getParent(); 8302 } else { 8303 assert(TUK == TUK_Friend); 8304 // C++ [namespace.memdef]p3: 8305 // If a friend declaration in a non-local class first declares a 8306 // class or function, the friend class or function is a member of 8307 // the innermost enclosing namespace. 8308 SearchDC = SearchDC->getEnclosingNamespaceContext(); 8309 } 8310 8311 // In C++, we need to do a redeclaration lookup to properly 8312 // diagnose some problems. 8313 if (getLangOpts().CPlusPlus) { 8314 Previous.setRedeclarationKind(ForRedeclaration); 8315 LookupQualifiedName(Previous, SearchDC); 8316 } 8317 } 8318 8319 if (!Previous.empty()) { 8320 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 8321 8322 // It's okay to have a tag decl in the same scope as a typedef 8323 // which hides a tag decl in the same scope. Finding this 8324 // insanity with a redeclaration lookup can only actually happen 8325 // in C++. 8326 // 8327 // This is also okay for elaborated-type-specifiers, which is 8328 // technically forbidden by the current standard but which is 8329 // okay according to the likely resolution of an open issue; 8330 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 8331 if (getLangOpts().CPlusPlus) { 8332 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8333 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 8334 TagDecl *Tag = TT->getDecl(); 8335 if (Tag->getDeclName() == Name && 8336 Tag->getDeclContext()->getRedeclContext() 8337 ->Equals(TD->getDeclContext()->getRedeclContext())) { 8338 PrevDecl = Tag; 8339 Previous.clear(); 8340 Previous.addDecl(Tag); 8341 Previous.resolveKind(); 8342 } 8343 } 8344 } 8345 } 8346 8347 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 8348 // If this is a use of a previous tag, or if the tag is already declared 8349 // in the same scope (so that the definition/declaration completes or 8350 // rementions the tag), reuse the decl. 8351 if (TUK == TUK_Reference || TUK == TUK_Friend || 8352 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 8353 // Make sure that this wasn't declared as an enum and now used as a 8354 // struct or something similar. 8355 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 8356 TUK == TUK_Definition, KWLoc, 8357 *Name)) { 8358 bool SafeToContinue 8359 = (PrevTagDecl->getTagKind() != TTK_Enum && 8360 Kind != TTK_Enum); 8361 if (SafeToContinue) 8362 Diag(KWLoc, diag::err_use_with_wrong_tag) 8363 << Name 8364 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8365 PrevTagDecl->getKindName()); 8366 else 8367 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8368 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8369 8370 if (SafeToContinue) 8371 Kind = PrevTagDecl->getTagKind(); 8372 else { 8373 // Recover by making this an anonymous redefinition. 8374 Name = 0; 8375 Previous.clear(); 8376 Invalid = true; 8377 } 8378 } 8379 8380 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8381 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8382 8383 // If this is an elaborated-type-specifier for a scoped enumeration, 8384 // the 'class' keyword is not necessary and not permitted. 8385 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8386 if (ScopedEnum) 8387 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8388 << PrevEnum->isScoped() 8389 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8390 return PrevTagDecl; 8391 } 8392 8393 QualType EnumUnderlyingTy; 8394 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8395 EnumUnderlyingTy = TI->getType(); 8396 else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>()) 8397 EnumUnderlyingTy = QualType(T, 0); 8398 8399 // All conflicts with previous declarations are recovered by 8400 // returning the previous declaration, unless this is a definition, 8401 // in which case we want the caller to bail out. 8402 if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc, 8403 ScopedEnum, EnumUnderlyingTy, PrevEnum)) 8404 return TUK == TUK_Declaration ? PrevTagDecl : 0; 8405 } 8406 8407 if (!Invalid) { 8408 // If this is a use, just return the declaration we found. 8409 8410 // FIXME: In the future, return a variant or some other clue 8411 // for the consumer of this Decl to know it doesn't own it. 8412 // For our current ASTs this shouldn't be a problem, but will 8413 // need to be changed with DeclGroups. 8414 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8415 getLangOpts().MicrosoftExt)) || TUK == TUK_Friend) 8416 return PrevTagDecl; 8417 8418 // Diagnose attempts to redefine a tag. 8419 if (TUK == TUK_Definition) { 8420 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8421 // If we're defining a specialization and the previous definition 8422 // is from an implicit instantiation, don't emit an error 8423 // here; we'll catch this in the general case below. 8424 bool IsExplicitSpecializationAfterInstantiation = false; 8425 if (isExplicitSpecialization) { 8426 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def)) 8427 IsExplicitSpecializationAfterInstantiation = 8428 RD->getTemplateSpecializationKind() != 8429 TSK_ExplicitSpecialization; 8430 else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def)) 8431 IsExplicitSpecializationAfterInstantiation = 8432 ED->getTemplateSpecializationKind() != 8433 TSK_ExplicitSpecialization; 8434 } 8435 8436 if (!IsExplicitSpecializationAfterInstantiation) { 8437 // A redeclaration in function prototype scope in C isn't 8438 // visible elsewhere, so merely issue a warning. 8439 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope()) 8440 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name; 8441 else 8442 Diag(NameLoc, diag::err_redefinition) << Name; 8443 Diag(Def->getLocation(), diag::note_previous_definition); 8444 // If this is a redefinition, recover by making this 8445 // struct be anonymous, which will make any later 8446 // references get the previous definition. 8447 Name = 0; 8448 Previous.clear(); 8449 Invalid = true; 8450 } 8451 } else { 8452 // If the type is currently being defined, complain 8453 // about a nested redefinition. 8454 const TagType *Tag 8455 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8456 if (Tag->isBeingDefined()) { 8457 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8458 Diag(PrevTagDecl->getLocation(), 8459 diag::note_previous_definition); 8460 Name = 0; 8461 Previous.clear(); 8462 Invalid = true; 8463 } 8464 } 8465 8466 // Okay, this is definition of a previously declared or referenced 8467 // tag PrevDecl. We're going to create a new Decl for it. 8468 } 8469 } 8470 // If we get here we have (another) forward declaration or we 8471 // have a definition. Just create a new decl. 8472 8473 } else { 8474 // If we get here, this is a definition of a new tag type in a nested 8475 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8476 // new decl/type. We set PrevDecl to NULL so that the entities 8477 // have distinct types. 8478 Previous.clear(); 8479 } 8480 // If we get here, we're going to create a new Decl. If PrevDecl 8481 // is non-NULL, it's a definition of the tag declared by 8482 // PrevDecl. If it's NULL, we have a new definition. 8483 8484 8485 // Otherwise, PrevDecl is not a tag, but was found with tag 8486 // lookup. This is only actually possible in C++, where a few 8487 // things like templates still live in the tag namespace. 8488 } else { 8489 // Use a better diagnostic if an elaborated-type-specifier 8490 // found the wrong kind of type on the first 8491 // (non-redeclaration) lookup. 8492 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8493 !Previous.isForRedeclaration()) { 8494 unsigned Kind = 0; 8495 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8496 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8497 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8498 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8499 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8500 Invalid = true; 8501 8502 // Otherwise, only diagnose if the declaration is in scope. 8503 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8504 isExplicitSpecialization)) { 8505 // do nothing 8506 8507 // Diagnose implicit declarations introduced by elaborated types. 8508 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8509 unsigned Kind = 0; 8510 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8511 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8512 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8513 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8514 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8515 Invalid = true; 8516 8517 // Otherwise it's a declaration. Call out a particularly common 8518 // case here. 8519 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8520 unsigned Kind = 0; 8521 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8522 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8523 << Name << Kind << TND->getUnderlyingType(); 8524 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8525 Invalid = true; 8526 8527 // Otherwise, diagnose. 8528 } else { 8529 // The tag name clashes with something else in the target scope, 8530 // issue an error and recover by making this tag be anonymous. 8531 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8532 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8533 Name = 0; 8534 Invalid = true; 8535 } 8536 8537 // The existing declaration isn't relevant to us; we're in a 8538 // new scope, so clear out the previous declaration. 8539 Previous.clear(); 8540 } 8541 } 8542 8543CreateNewDecl: 8544 8545 TagDecl *PrevDecl = 0; 8546 if (Previous.isSingleResult()) 8547 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8548 8549 // If there is an identifier, use the location of the identifier as the 8550 // location of the decl, otherwise use the location of the struct/union 8551 // keyword. 8552 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8553 8554 // Otherwise, create a new declaration. If there is a previous 8555 // declaration of the same entity, the two will be linked via 8556 // PrevDecl. 8557 TagDecl *New; 8558 8559 bool IsForwardReference = false; 8560 if (Kind == TTK_Enum) { 8561 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8562 // enum X { A, B, C } D; D should chain to X. 8563 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8564 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8565 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8566 // If this is an undefined enum, warn. 8567 if (TUK != TUK_Definition && !Invalid) { 8568 TagDecl *Def; 8569 if (getLangOpts().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8570 // C++0x: 7.2p2: opaque-enum-declaration. 8571 // Conflicts are diagnosed above. Do nothing. 8572 } 8573 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8574 Diag(Loc, diag::ext_forward_ref_enum_def) 8575 << New; 8576 Diag(Def->getLocation(), diag::note_previous_definition); 8577 } else { 8578 unsigned DiagID = diag::ext_forward_ref_enum; 8579 if (getLangOpts().MicrosoftMode) 8580 DiagID = diag::ext_ms_forward_ref_enum; 8581 else if (getLangOpts().CPlusPlus) 8582 DiagID = diag::err_forward_ref_enum; 8583 Diag(Loc, DiagID); 8584 8585 // If this is a forward-declared reference to an enumeration, make a 8586 // note of it; we won't actually be introducing the declaration into 8587 // the declaration context. 8588 if (TUK == TUK_Reference) 8589 IsForwardReference = true; 8590 } 8591 } 8592 8593 if (EnumUnderlying) { 8594 EnumDecl *ED = cast<EnumDecl>(New); 8595 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8596 ED->setIntegerTypeSourceInfo(TI); 8597 else 8598 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8599 ED->setPromotionType(ED->getIntegerType()); 8600 } 8601 8602 } else { 8603 // struct/union/class 8604 8605 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8606 // struct X { int A; } D; D should chain to X. 8607 if (getLangOpts().CPlusPlus) { 8608 // FIXME: Look for a way to use RecordDecl for simple structs. 8609 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8610 cast_or_null<CXXRecordDecl>(PrevDecl)); 8611 8612 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8613 StdBadAlloc = cast<CXXRecordDecl>(New); 8614 } else 8615 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8616 cast_or_null<RecordDecl>(PrevDecl)); 8617 } 8618 8619 // Maybe add qualifier info. 8620 if (SS.isNotEmpty()) { 8621 if (SS.isSet()) { 8622 // If this is either a declaration or a definition, check the 8623 // nested-name-specifier against the current context. We don't do this 8624 // for explicit specializations, because they have similar checking 8625 // (with more specific diagnostics) in the call to 8626 // CheckMemberSpecialization, below. 8627 if (!isExplicitSpecialization && 8628 (TUK == TUK_Definition || TUK == TUK_Declaration) && 8629 diagnoseQualifiedDeclaration(SS, DC, OrigName, NameLoc)) 8630 Invalid = true; 8631 8632 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8633 if (TemplateParameterLists.size() > 0) { 8634 New->setTemplateParameterListsInfo(Context, 8635 TemplateParameterLists.size(), 8636 (TemplateParameterList**) TemplateParameterLists.release()); 8637 } 8638 } 8639 else 8640 Invalid = true; 8641 } 8642 8643 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8644 // Add alignment attributes if necessary; these attributes are checked when 8645 // the ASTContext lays out the structure. 8646 // 8647 // It is important for implementing the correct semantics that this 8648 // happen here (in act on tag decl). The #pragma pack stack is 8649 // maintained as a result of parser callbacks which can occur at 8650 // many points during the parsing of a struct declaration (because 8651 // the #pragma tokens are effectively skipped over during the 8652 // parsing of the struct). 8653 AddAlignmentAttributesForRecord(RD); 8654 8655 AddMsStructLayoutForRecord(RD); 8656 } 8657 8658 if (ModulePrivateLoc.isValid()) { 8659 if (isExplicitSpecialization) 8660 Diag(New->getLocation(), diag::err_module_private_specialization) 8661 << 2 8662 << FixItHint::CreateRemoval(ModulePrivateLoc); 8663 // __module_private__ does not apply to local classes. However, we only 8664 // diagnose this as an error when the declaration specifiers are 8665 // freestanding. Here, we just ignore the __module_private__. 8666 else if (!SearchDC->isFunctionOrMethod()) 8667 New->setModulePrivate(); 8668 } 8669 8670 // If this is a specialization of a member class (of a class template), 8671 // check the specialization. 8672 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8673 Invalid = true; 8674 8675 if (Invalid) 8676 New->setInvalidDecl(); 8677 8678 if (Attr) 8679 ProcessDeclAttributeList(S, New, Attr); 8680 8681 // If we're declaring or defining a tag in function prototype scope 8682 // in C, note that this type can only be used within the function. 8683 if (Name && S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus) 8684 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8685 8686 // Set the lexical context. If the tag has a C++ scope specifier, the 8687 // lexical context will be different from the semantic context. 8688 New->setLexicalDeclContext(CurContext); 8689 8690 // Mark this as a friend decl if applicable. 8691 // In Microsoft mode, a friend declaration also acts as a forward 8692 // declaration so we always pass true to setObjectOfFriendDecl to make 8693 // the tag name visible. 8694 if (TUK == TUK_Friend) 8695 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8696 getLangOpts().MicrosoftExt); 8697 8698 // Set the access specifier. 8699 if (!Invalid && SearchDC->isRecord()) 8700 SetMemberAccessSpecifier(New, PrevDecl, AS); 8701 8702 if (TUK == TUK_Definition) 8703 New->startDefinition(); 8704 8705 // If this has an identifier, add it to the scope stack. 8706 if (TUK == TUK_Friend) { 8707 // We might be replacing an existing declaration in the lookup tables; 8708 // if so, borrow its access specifier. 8709 if (PrevDecl) 8710 New->setAccess(PrevDecl->getAccess()); 8711 8712 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8713 DC->makeDeclVisibleInContext(New); 8714 if (Name) // can be null along some error paths 8715 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8716 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8717 } else if (Name) { 8718 S = getNonFieldDeclScope(S); 8719 PushOnScopeChains(New, S, !IsForwardReference); 8720 if (IsForwardReference) 8721 SearchDC->makeDeclVisibleInContext(New); 8722 8723 } else { 8724 CurContext->addDecl(New); 8725 } 8726 8727 // If this is the C FILE type, notify the AST context. 8728 if (IdentifierInfo *II = New->getIdentifier()) 8729 if (!New->isInvalidDecl() && 8730 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8731 II->isStr("FILE")) 8732 Context.setFILEDecl(New); 8733 8734 // If we were in function prototype scope (and not in C++ mode), add this 8735 // tag to the list of decls to inject into the function definition scope. 8736 if (S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus && 8737 InFunctionDeclarator && Name) 8738 DeclsInPrototypeScope.push_back(New); 8739 8740 if (PrevDecl) 8741 mergeDeclAttributes(New, PrevDecl); 8742 8743 OwnedDecl = true; 8744 return New; 8745} 8746 8747void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8748 AdjustDeclIfTemplate(TagD); 8749 TagDecl *Tag = cast<TagDecl>(TagD); 8750 8751 // Enter the tag context. 8752 PushDeclContext(S, Tag); 8753} 8754 8755Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8756 assert(isa<ObjCContainerDecl>(IDecl) && 8757 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8758 DeclContext *OCD = cast<DeclContext>(IDecl); 8759 assert(getContainingDC(OCD) == CurContext && 8760 "The next DeclContext should be lexically contained in the current one."); 8761 CurContext = OCD; 8762 return IDecl; 8763} 8764 8765void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8766 SourceLocation FinalLoc, 8767 SourceLocation LBraceLoc) { 8768 AdjustDeclIfTemplate(TagD); 8769 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8770 8771 FieldCollector->StartClass(); 8772 8773 if (!Record->getIdentifier()) 8774 return; 8775 8776 if (FinalLoc.isValid()) 8777 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8778 8779 // C++ [class]p2: 8780 // [...] The class-name is also inserted into the scope of the 8781 // class itself; this is known as the injected-class-name. For 8782 // purposes of access checking, the injected-class-name is treated 8783 // as if it were a public member name. 8784 CXXRecordDecl *InjectedClassName 8785 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8786 Record->getLocStart(), Record->getLocation(), 8787 Record->getIdentifier(), 8788 /*PrevDecl=*/0, 8789 /*DelayTypeCreation=*/true); 8790 Context.getTypeDeclType(InjectedClassName, Record); 8791 InjectedClassName->setImplicit(); 8792 InjectedClassName->setAccess(AS_public); 8793 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8794 InjectedClassName->setDescribedClassTemplate(Template); 8795 PushOnScopeChains(InjectedClassName, S); 8796 assert(InjectedClassName->isInjectedClassName() && 8797 "Broken injected-class-name"); 8798} 8799 8800void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8801 SourceLocation RBraceLoc) { 8802 AdjustDeclIfTemplate(TagD); 8803 TagDecl *Tag = cast<TagDecl>(TagD); 8804 Tag->setRBraceLoc(RBraceLoc); 8805 8806 // Make sure we "complete" the definition even it is invalid. 8807 if (Tag->isBeingDefined()) { 8808 assert(Tag->isInvalidDecl() && "We should already have completed it"); 8809 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 8810 RD->completeDefinition(); 8811 } 8812 8813 if (isa<CXXRecordDecl>(Tag)) 8814 FieldCollector->FinishClass(); 8815 8816 // Exit this scope of this tag's definition. 8817 PopDeclContext(); 8818 8819 // Notify the consumer that we've defined a tag. 8820 Consumer.HandleTagDeclDefinition(Tag); 8821} 8822 8823void Sema::ActOnObjCContainerFinishDefinition() { 8824 // Exit this scope of this interface definition. 8825 PopDeclContext(); 8826} 8827 8828void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8829 assert(DC == CurContext && "Mismatch of container contexts"); 8830 OriginalLexicalContext = DC; 8831 ActOnObjCContainerFinishDefinition(); 8832} 8833 8834void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8835 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8836 OriginalLexicalContext = 0; 8837} 8838 8839void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8840 AdjustDeclIfTemplate(TagD); 8841 TagDecl *Tag = cast<TagDecl>(TagD); 8842 Tag->setInvalidDecl(); 8843 8844 // Make sure we "complete" the definition even it is invalid. 8845 if (Tag->isBeingDefined()) { 8846 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 8847 RD->completeDefinition(); 8848 } 8849 8850 // We're undoing ActOnTagStartDefinition here, not 8851 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8852 // the FieldCollector. 8853 8854 PopDeclContext(); 8855} 8856 8857// Note that FieldName may be null for anonymous bitfields. 8858ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 8859 IdentifierInfo *FieldName, 8860 QualType FieldTy, Expr *BitWidth, 8861 bool *ZeroWidth) { 8862 // Default to true; that shouldn't confuse checks for emptiness 8863 if (ZeroWidth) 8864 *ZeroWidth = true; 8865 8866 // C99 6.7.2.1p4 - verify the field type. 8867 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8868 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8869 // Handle incomplete types with specific error. 8870 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8871 return ExprError(); 8872 if (FieldName) 8873 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8874 << FieldName << FieldTy << BitWidth->getSourceRange(); 8875 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8876 << FieldTy << BitWidth->getSourceRange(); 8877 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8878 UPPC_BitFieldWidth)) 8879 return ExprError(); 8880 8881 // If the bit-width is type- or value-dependent, don't try to check 8882 // it now. 8883 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8884 return Owned(BitWidth); 8885 8886 llvm::APSInt Value; 8887 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 8888 if (ICE.isInvalid()) 8889 return ICE; 8890 BitWidth = ICE.take(); 8891 8892 if (Value != 0 && ZeroWidth) 8893 *ZeroWidth = false; 8894 8895 // Zero-width bitfield is ok for anonymous field. 8896 if (Value == 0 && FieldName) 8897 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8898 8899 if (Value.isSigned() && Value.isNegative()) { 8900 if (FieldName) 8901 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8902 << FieldName << Value.toString(10); 8903 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8904 << Value.toString(10); 8905 } 8906 8907 if (!FieldTy->isDependentType()) { 8908 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8909 if (Value.getZExtValue() > TypeSize) { 8910 if (!getLangOpts().CPlusPlus) { 8911 if (FieldName) 8912 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8913 << FieldName << (unsigned)Value.getZExtValue() 8914 << (unsigned)TypeSize; 8915 8916 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8917 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8918 } 8919 8920 if (FieldName) 8921 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8922 << FieldName << (unsigned)Value.getZExtValue() 8923 << (unsigned)TypeSize; 8924 else 8925 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8926 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8927 } 8928 } 8929 8930 return Owned(BitWidth); 8931} 8932 8933/// ActOnField - Each field of a C struct/union is passed into this in order 8934/// to create a FieldDecl object for it. 8935Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8936 Declarator &D, Expr *BitfieldWidth) { 8937 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8938 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8939 /*HasInit=*/false, AS_public); 8940 return Res; 8941} 8942 8943/// HandleField - Analyze a field of a C struct or a C++ data member. 8944/// 8945FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8946 SourceLocation DeclStart, 8947 Declarator &D, Expr *BitWidth, bool HasInit, 8948 AccessSpecifier AS) { 8949 IdentifierInfo *II = D.getIdentifier(); 8950 SourceLocation Loc = DeclStart; 8951 if (II) Loc = D.getIdentifierLoc(); 8952 8953 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8954 QualType T = TInfo->getType(); 8955 if (getLangOpts().CPlusPlus) { 8956 CheckExtraCXXDefaultArguments(D); 8957 8958 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8959 UPPC_DataMemberType)) { 8960 D.setInvalidType(); 8961 T = Context.IntTy; 8962 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8963 } 8964 } 8965 8966 DiagnoseFunctionSpecifiers(D); 8967 8968 if (D.getDeclSpec().isThreadSpecified()) 8969 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8970 if (D.getDeclSpec().isConstexprSpecified()) 8971 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8972 << 2; 8973 8974 // Check to see if this name was declared as a member previously 8975 NamedDecl *PrevDecl = 0; 8976 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8977 LookupName(Previous, S); 8978 switch (Previous.getResultKind()) { 8979 case LookupResult::Found: 8980 case LookupResult::FoundUnresolvedValue: 8981 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8982 break; 8983 8984 case LookupResult::FoundOverloaded: 8985 PrevDecl = Previous.getRepresentativeDecl(); 8986 break; 8987 8988 case LookupResult::NotFound: 8989 case LookupResult::NotFoundInCurrentInstantiation: 8990 case LookupResult::Ambiguous: 8991 break; 8992 } 8993 Previous.suppressDiagnostics(); 8994 8995 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8996 // Maybe we will complain about the shadowed template parameter. 8997 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8998 // Just pretend that we didn't see the previous declaration. 8999 PrevDecl = 0; 9000 } 9001 9002 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 9003 PrevDecl = 0; 9004 9005 bool Mutable 9006 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 9007 SourceLocation TSSL = D.getLocStart(); 9008 FieldDecl *NewFD 9009 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 9010 TSSL, AS, PrevDecl, &D); 9011 9012 if (NewFD->isInvalidDecl()) 9013 Record->setInvalidDecl(); 9014 9015 if (D.getDeclSpec().isModulePrivateSpecified()) 9016 NewFD->setModulePrivate(); 9017 9018 if (NewFD->isInvalidDecl() && PrevDecl) { 9019 // Don't introduce NewFD into scope; there's already something 9020 // with the same name in the same scope. 9021 } else if (II) { 9022 PushOnScopeChains(NewFD, S); 9023 } else 9024 Record->addDecl(NewFD); 9025 9026 return NewFD; 9027} 9028 9029/// \brief Build a new FieldDecl and check its well-formedness. 9030/// 9031/// This routine builds a new FieldDecl given the fields name, type, 9032/// record, etc. \p PrevDecl should refer to any previous declaration 9033/// with the same name and in the same scope as the field to be 9034/// created. 9035/// 9036/// \returns a new FieldDecl. 9037/// 9038/// \todo The Declarator argument is a hack. It will be removed once 9039FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 9040 TypeSourceInfo *TInfo, 9041 RecordDecl *Record, SourceLocation Loc, 9042 bool Mutable, Expr *BitWidth, bool HasInit, 9043 SourceLocation TSSL, 9044 AccessSpecifier AS, NamedDecl *PrevDecl, 9045 Declarator *D) { 9046 IdentifierInfo *II = Name.getAsIdentifierInfo(); 9047 bool InvalidDecl = false; 9048 if (D) InvalidDecl = D->isInvalidType(); 9049 9050 // If we receive a broken type, recover by assuming 'int' and 9051 // marking this declaration as invalid. 9052 if (T.isNull()) { 9053 InvalidDecl = true; 9054 T = Context.IntTy; 9055 } 9056 9057 QualType EltTy = Context.getBaseElementType(T); 9058 if (!EltTy->isDependentType()) { 9059 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 9060 // Fields of incomplete type force their record to be invalid. 9061 Record->setInvalidDecl(); 9062 InvalidDecl = true; 9063 } else { 9064 NamedDecl *Def; 9065 EltTy->isIncompleteType(&Def); 9066 if (Def && Def->isInvalidDecl()) { 9067 Record->setInvalidDecl(); 9068 InvalidDecl = true; 9069 } 9070 } 9071 } 9072 9073 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9074 // than a variably modified type. 9075 if (!InvalidDecl && T->isVariablyModifiedType()) { 9076 bool SizeIsNegative; 9077 llvm::APSInt Oversized; 9078 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 9079 SizeIsNegative, 9080 Oversized); 9081 if (!FixedTy.isNull()) { 9082 Diag(Loc, diag::warn_illegal_constant_array_size); 9083 T = FixedTy; 9084 } else { 9085 if (SizeIsNegative) 9086 Diag(Loc, diag::err_typecheck_negative_array_size); 9087 else if (Oversized.getBoolValue()) 9088 Diag(Loc, diag::err_array_too_large) 9089 << Oversized.toString(10); 9090 else 9091 Diag(Loc, diag::err_typecheck_field_variable_size); 9092 InvalidDecl = true; 9093 } 9094 } 9095 9096 // Fields can not have abstract class types 9097 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 9098 diag::err_abstract_type_in_decl, 9099 AbstractFieldType)) 9100 InvalidDecl = true; 9101 9102 bool ZeroWidth = false; 9103 // If this is declared as a bit-field, check the bit-field. 9104 if (!InvalidDecl && BitWidth) { 9105 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 9106 if (!BitWidth) { 9107 InvalidDecl = true; 9108 BitWidth = 0; 9109 ZeroWidth = false; 9110 } 9111 } 9112 9113 // Check that 'mutable' is consistent with the type of the declaration. 9114 if (!InvalidDecl && Mutable) { 9115 unsigned DiagID = 0; 9116 if (T->isReferenceType()) 9117 DiagID = diag::err_mutable_reference; 9118 else if (T.isConstQualified()) 9119 DiagID = diag::err_mutable_const; 9120 9121 if (DiagID) { 9122 SourceLocation ErrLoc = Loc; 9123 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 9124 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 9125 Diag(ErrLoc, DiagID); 9126 Mutable = false; 9127 InvalidDecl = true; 9128 } 9129 } 9130 9131 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 9132 BitWidth, Mutable, HasInit); 9133 if (InvalidDecl) 9134 NewFD->setInvalidDecl(); 9135 9136 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 9137 Diag(Loc, diag::err_duplicate_member) << II; 9138 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9139 NewFD->setInvalidDecl(); 9140 } 9141 9142 if (!InvalidDecl && getLangOpts().CPlusPlus) { 9143 if (Record->isUnion()) { 9144 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9145 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9146 if (RDecl->getDefinition()) { 9147 // C++ [class.union]p1: An object of a class with a non-trivial 9148 // constructor, a non-trivial copy constructor, a non-trivial 9149 // destructor, or a non-trivial copy assignment operator 9150 // cannot be a member of a union, nor can an array of such 9151 // objects. 9152 if (CheckNontrivialField(NewFD)) 9153 NewFD->setInvalidDecl(); 9154 } 9155 } 9156 9157 // C++ [class.union]p1: If a union contains a member of reference type, 9158 // the program is ill-formed. 9159 if (EltTy->isReferenceType()) { 9160 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 9161 << NewFD->getDeclName() << EltTy; 9162 NewFD->setInvalidDecl(); 9163 } 9164 } 9165 } 9166 9167 // FIXME: We need to pass in the attributes given an AST 9168 // representation, not a parser representation. 9169 if (D) 9170 // FIXME: What to pass instead of TUScope? 9171 ProcessDeclAttributes(TUScope, NewFD, *D); 9172 9173 // In auto-retain/release, infer strong retension for fields of 9174 // retainable type. 9175 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 9176 NewFD->setInvalidDecl(); 9177 9178 if (T.isObjCGCWeak()) 9179 Diag(Loc, diag::warn_attribute_weak_on_field); 9180 9181 NewFD->setAccess(AS); 9182 return NewFD; 9183} 9184 9185bool Sema::CheckNontrivialField(FieldDecl *FD) { 9186 assert(FD); 9187 assert(getLangOpts().CPlusPlus && "valid check only for C++"); 9188 9189 if (FD->isInvalidDecl()) 9190 return true; 9191 9192 QualType EltTy = Context.getBaseElementType(FD->getType()); 9193 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9194 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9195 if (RDecl->getDefinition()) { 9196 // We check for copy constructors before constructors 9197 // because otherwise we'll never get complaints about 9198 // copy constructors. 9199 9200 CXXSpecialMember member = CXXInvalid; 9201 if (!RDecl->hasTrivialCopyConstructor()) 9202 member = CXXCopyConstructor; 9203 else if (!RDecl->hasTrivialDefaultConstructor()) 9204 member = CXXDefaultConstructor; 9205 else if (!RDecl->hasTrivialCopyAssignment()) 9206 member = CXXCopyAssignment; 9207 else if (!RDecl->hasTrivialDestructor()) 9208 member = CXXDestructor; 9209 9210 if (member != CXXInvalid) { 9211 if (!getLangOpts().CPlusPlus0x && 9212 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) { 9213 // Objective-C++ ARC: it is an error to have a non-trivial field of 9214 // a union. However, system headers in Objective-C programs 9215 // occasionally have Objective-C lifetime objects within unions, 9216 // and rather than cause the program to fail, we make those 9217 // members unavailable. 9218 SourceLocation Loc = FD->getLocation(); 9219 if (getSourceManager().isInSystemHeader(Loc)) { 9220 if (!FD->hasAttr<UnavailableAttr>()) 9221 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 9222 "this system field has retaining ownership")); 9223 return false; 9224 } 9225 } 9226 9227 Diag(FD->getLocation(), getLangOpts().CPlusPlus0x ? 9228 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 9229 diag::err_illegal_union_or_anon_struct_member) 9230 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 9231 DiagnoseNontrivial(RT, member); 9232 return !getLangOpts().CPlusPlus0x; 9233 } 9234 } 9235 } 9236 9237 return false; 9238} 9239 9240/// If the given constructor is user-provided, produce a diagnostic explaining 9241/// that it makes the class non-trivial. 9242static bool DiagnoseNontrivialUserProvidedCtor(Sema &S, QualType QT, 9243 CXXConstructorDecl *CD, 9244 Sema::CXXSpecialMember CSM) { 9245 if (!CD->isUserProvided()) 9246 return false; 9247 9248 SourceLocation CtorLoc = CD->getLocation(); 9249 S.Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << CSM; 9250 return true; 9251} 9252 9253/// DiagnoseNontrivial - Given that a class has a non-trivial 9254/// special member, figure out why. 9255void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 9256 QualType QT(T, 0U); 9257 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 9258 9259 // Check whether the member was user-declared. 9260 switch (member) { 9261 case CXXInvalid: 9262 break; 9263 9264 case CXXDefaultConstructor: 9265 if (RD->hasUserDeclaredConstructor()) { 9266 typedef CXXRecordDecl::ctor_iterator ctor_iter; 9267 for (ctor_iter CI = RD->ctor_begin(), CE = RD->ctor_end(); CI != CE; ++CI) 9268 if (DiagnoseNontrivialUserProvidedCtor(*this, QT, &*CI, member)) 9269 return; 9270 9271 // No user-provided constructors; look for constructor templates. 9272 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 9273 tmpl_iter; 9274 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); 9275 TI != TE; ++TI) { 9276 CXXConstructorDecl *CD = 9277 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()); 9278 if (CD && DiagnoseNontrivialUserProvidedCtor(*this, QT, CD, member)) 9279 return; 9280 } 9281 } 9282 break; 9283 9284 case CXXCopyConstructor: 9285 if (RD->hasUserDeclaredCopyConstructor()) { 9286 SourceLocation CtorLoc = 9287 RD->getCopyConstructor(0)->getLocation(); 9288 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9289 return; 9290 } 9291 break; 9292 9293 case CXXMoveConstructor: 9294 if (RD->hasUserDeclaredMoveConstructor()) { 9295 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 9296 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9297 return; 9298 } 9299 break; 9300 9301 case CXXCopyAssignment: 9302 if (RD->hasUserDeclaredCopyAssignment()) { 9303 // FIXME: this should use the location of the copy 9304 // assignment, not the type. 9305 SourceLocation TyLoc = RD->getLocStart(); 9306 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 9307 return; 9308 } 9309 break; 9310 9311 case CXXMoveAssignment: 9312 if (RD->hasUserDeclaredMoveAssignment()) { 9313 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 9314 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9315 return; 9316 } 9317 break; 9318 9319 case CXXDestructor: 9320 if (RD->hasUserDeclaredDestructor()) { 9321 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 9322 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9323 return; 9324 } 9325 break; 9326 } 9327 9328 typedef CXXRecordDecl::base_class_iterator base_iter; 9329 9330 // Virtual bases and members inhibit trivial copying/construction, 9331 // but not trivial destruction. 9332 if (member != CXXDestructor) { 9333 // Check for virtual bases. vbases includes indirect virtual bases, 9334 // so we just iterate through the direct bases. 9335 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 9336 if (bi->isVirtual()) { 9337 SourceLocation BaseLoc = bi->getLocStart(); 9338 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 9339 return; 9340 } 9341 9342 // Check for virtual methods. 9343 typedef CXXRecordDecl::method_iterator meth_iter; 9344 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 9345 ++mi) { 9346 if (mi->isVirtual()) { 9347 SourceLocation MLoc = mi->getLocStart(); 9348 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 9349 return; 9350 } 9351 } 9352 } 9353 9354 bool (CXXRecordDecl::*hasTrivial)() const; 9355 switch (member) { 9356 case CXXDefaultConstructor: 9357 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 9358 case CXXCopyConstructor: 9359 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 9360 case CXXCopyAssignment: 9361 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 9362 case CXXDestructor: 9363 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 9364 default: 9365 llvm_unreachable("unexpected special member"); 9366 } 9367 9368 // Check for nontrivial bases (and recurse). 9369 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 9370 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 9371 assert(BaseRT && "Don't know how to handle dependent bases"); 9372 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 9373 if (!(BaseRecTy->*hasTrivial)()) { 9374 SourceLocation BaseLoc = bi->getLocStart(); 9375 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 9376 DiagnoseNontrivial(BaseRT, member); 9377 return; 9378 } 9379 } 9380 9381 // Check for nontrivial members (and recurse). 9382 typedef RecordDecl::field_iterator field_iter; 9383 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 9384 ++fi) { 9385 QualType EltTy = Context.getBaseElementType(fi->getType()); 9386 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 9387 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 9388 9389 if (!(EltRD->*hasTrivial)()) { 9390 SourceLocation FLoc = fi->getLocation(); 9391 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 9392 DiagnoseNontrivial(EltRT, member); 9393 return; 9394 } 9395 } 9396 9397 if (EltTy->isObjCLifetimeType()) { 9398 switch (EltTy.getObjCLifetime()) { 9399 case Qualifiers::OCL_None: 9400 case Qualifiers::OCL_ExplicitNone: 9401 break; 9402 9403 case Qualifiers::OCL_Autoreleasing: 9404 case Qualifiers::OCL_Weak: 9405 case Qualifiers::OCL_Strong: 9406 Diag(fi->getLocation(), diag::note_nontrivial_objc_ownership) 9407 << QT << EltTy.getObjCLifetime(); 9408 return; 9409 } 9410 } 9411 } 9412 9413 llvm_unreachable("found no explanation for non-trivial member"); 9414} 9415 9416/// TranslateIvarVisibility - Translate visibility from a token ID to an 9417/// AST enum value. 9418static ObjCIvarDecl::AccessControl 9419TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9420 switch (ivarVisibility) { 9421 default: llvm_unreachable("Unknown visitibility kind"); 9422 case tok::objc_private: return ObjCIvarDecl::Private; 9423 case tok::objc_public: return ObjCIvarDecl::Public; 9424 case tok::objc_protected: return ObjCIvarDecl::Protected; 9425 case tok::objc_package: return ObjCIvarDecl::Package; 9426 } 9427} 9428 9429/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9430/// in order to create an IvarDecl object for it. 9431Decl *Sema::ActOnIvar(Scope *S, 9432 SourceLocation DeclStart, 9433 Declarator &D, Expr *BitfieldWidth, 9434 tok::ObjCKeywordKind Visibility) { 9435 9436 IdentifierInfo *II = D.getIdentifier(); 9437 Expr *BitWidth = (Expr*)BitfieldWidth; 9438 SourceLocation Loc = DeclStart; 9439 if (II) Loc = D.getIdentifierLoc(); 9440 9441 // FIXME: Unnamed fields can be handled in various different ways, for 9442 // example, unnamed unions inject all members into the struct namespace! 9443 9444 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9445 QualType T = TInfo->getType(); 9446 9447 if (BitWidth) { 9448 // 6.7.2.1p3, 6.7.2.1p4 9449 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9450 if (!BitWidth) 9451 D.setInvalidType(); 9452 } else { 9453 // Not a bitfield. 9454 9455 // validate II. 9456 9457 } 9458 if (T->isReferenceType()) { 9459 Diag(Loc, diag::err_ivar_reference_type); 9460 D.setInvalidType(); 9461 } 9462 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9463 // than a variably modified type. 9464 else if (T->isVariablyModifiedType()) { 9465 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9466 D.setInvalidType(); 9467 } 9468 9469 // Get the visibility (access control) for this ivar. 9470 ObjCIvarDecl::AccessControl ac = 9471 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9472 : ObjCIvarDecl::None; 9473 // Must set ivar's DeclContext to its enclosing interface. 9474 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9475 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9476 return 0; 9477 ObjCContainerDecl *EnclosingContext; 9478 if (ObjCImplementationDecl *IMPDecl = 9479 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9480 if (!LangOpts.ObjCNonFragileABI2) { 9481 // Case of ivar declared in an implementation. Context is that of its class. 9482 EnclosingContext = IMPDecl->getClassInterface(); 9483 assert(EnclosingContext && "Implementation has no class interface!"); 9484 } 9485 else 9486 EnclosingContext = EnclosingDecl; 9487 } else { 9488 if (ObjCCategoryDecl *CDecl = 9489 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9490 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9491 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9492 return 0; 9493 } 9494 } 9495 EnclosingContext = EnclosingDecl; 9496 } 9497 9498 // Construct the decl. 9499 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9500 DeclStart, Loc, II, T, 9501 TInfo, ac, (Expr *)BitfieldWidth); 9502 9503 if (II) { 9504 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9505 ForRedeclaration); 9506 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9507 && !isa<TagDecl>(PrevDecl)) { 9508 Diag(Loc, diag::err_duplicate_member) << II; 9509 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9510 NewID->setInvalidDecl(); 9511 } 9512 } 9513 9514 // Process attributes attached to the ivar. 9515 ProcessDeclAttributes(S, NewID, D); 9516 9517 if (D.isInvalidType()) 9518 NewID->setInvalidDecl(); 9519 9520 // In ARC, infer 'retaining' for ivars of retainable type. 9521 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9522 NewID->setInvalidDecl(); 9523 9524 if (D.getDeclSpec().isModulePrivateSpecified()) 9525 NewID->setModulePrivate(); 9526 9527 if (II) { 9528 // FIXME: When interfaces are DeclContexts, we'll need to add 9529 // these to the interface. 9530 S->AddDecl(NewID); 9531 IdResolver.AddDecl(NewID); 9532 } 9533 9534 return NewID; 9535} 9536 9537/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9538/// class and class extensions. For every class @interface and class 9539/// extension @interface, if the last ivar is a bitfield of any type, 9540/// then add an implicit `char :0` ivar to the end of that interface. 9541void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9542 SmallVectorImpl<Decl *> &AllIvarDecls) { 9543 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9544 return; 9545 9546 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9547 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9548 9549 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9550 return; 9551 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9552 if (!ID) { 9553 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9554 if (!CD->IsClassExtension()) 9555 return; 9556 } 9557 // No need to add this to end of @implementation. 9558 else 9559 return; 9560 } 9561 // All conditions are met. Add a new bitfield to the tail end of ivars. 9562 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9563 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9564 9565 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9566 DeclLoc, DeclLoc, 0, 9567 Context.CharTy, 9568 Context.getTrivialTypeSourceInfo(Context.CharTy, 9569 DeclLoc), 9570 ObjCIvarDecl::Private, BW, 9571 true); 9572 AllIvarDecls.push_back(Ivar); 9573} 9574 9575void Sema::ActOnFields(Scope* S, 9576 SourceLocation RecLoc, Decl *EnclosingDecl, 9577 llvm::ArrayRef<Decl *> Fields, 9578 SourceLocation LBrac, SourceLocation RBrac, 9579 AttributeList *Attr) { 9580 assert(EnclosingDecl && "missing record or interface decl"); 9581 9582 // If the decl this is being inserted into is invalid, then it may be a 9583 // redeclaration or some other bogus case. Don't try to add fields to it. 9584 if (EnclosingDecl->isInvalidDecl()) 9585 return; 9586 9587 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9588 9589 // Start counting up the number of named members; make sure to include 9590 // members of anonymous structs and unions in the total. 9591 unsigned NumNamedMembers = 0; 9592 if (Record) { 9593 for (RecordDecl::decl_iterator i = Record->decls_begin(), 9594 e = Record->decls_end(); i != e; i++) { 9595 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i)) 9596 if (IFD->getDeclName()) 9597 ++NumNamedMembers; 9598 } 9599 } 9600 9601 // Verify that all the fields are okay. 9602 SmallVector<FieldDecl*, 32> RecFields; 9603 9604 bool ARCErrReported = false; 9605 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9606 i != end; ++i) { 9607 FieldDecl *FD = cast<FieldDecl>(*i); 9608 9609 // Get the type for the field. 9610 const Type *FDTy = FD->getType().getTypePtr(); 9611 9612 if (!FD->isAnonymousStructOrUnion()) { 9613 // Remember all fields written by the user. 9614 RecFields.push_back(FD); 9615 } 9616 9617 // If the field is already invalid for some reason, don't emit more 9618 // diagnostics about it. 9619 if (FD->isInvalidDecl()) { 9620 EnclosingDecl->setInvalidDecl(); 9621 continue; 9622 } 9623 9624 // C99 6.7.2.1p2: 9625 // A structure or union shall not contain a member with 9626 // incomplete or function type (hence, a structure shall not 9627 // contain an instance of itself, but may contain a pointer to 9628 // an instance of itself), except that the last member of a 9629 // structure with more than one named member may have incomplete 9630 // array type; such a structure (and any union containing, 9631 // possibly recursively, a member that is such a structure) 9632 // shall not be a member of a structure or an element of an 9633 // array. 9634 if (FDTy->isFunctionType()) { 9635 // Field declared as a function. 9636 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9637 << FD->getDeclName(); 9638 FD->setInvalidDecl(); 9639 EnclosingDecl->setInvalidDecl(); 9640 continue; 9641 } else if (FDTy->isIncompleteArrayType() && Record && 9642 ((i + 1 == Fields.end() && !Record->isUnion()) || 9643 ((getLangOpts().MicrosoftExt || 9644 getLangOpts().CPlusPlus) && 9645 (i + 1 == Fields.end() || Record->isUnion())))) { 9646 // Flexible array member. 9647 // Microsoft and g++ is more permissive regarding flexible array. 9648 // It will accept flexible array in union and also 9649 // as the sole element of a struct/class. 9650 if (getLangOpts().MicrosoftExt) { 9651 if (Record->isUnion()) 9652 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9653 << FD->getDeclName(); 9654 else if (Fields.size() == 1) 9655 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9656 << FD->getDeclName() << Record->getTagKind(); 9657 } else if (getLangOpts().CPlusPlus) { 9658 if (Record->isUnion()) 9659 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9660 << FD->getDeclName(); 9661 else if (Fields.size() == 1) 9662 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9663 << FD->getDeclName() << Record->getTagKind(); 9664 } else if (!getLangOpts().C99) { 9665 if (Record->isUnion()) 9666 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9667 << FD->getDeclName(); 9668 else 9669 Diag(FD->getLocation(), diag::ext_c99_flexible_array_member) 9670 << FD->getDeclName() << Record->getTagKind(); 9671 } else if (NumNamedMembers < 1) { 9672 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9673 << FD->getDeclName(); 9674 FD->setInvalidDecl(); 9675 EnclosingDecl->setInvalidDecl(); 9676 continue; 9677 } 9678 if (!FD->getType()->isDependentType() && 9679 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9680 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9681 << FD->getDeclName() << FD->getType(); 9682 FD->setInvalidDecl(); 9683 EnclosingDecl->setInvalidDecl(); 9684 continue; 9685 } 9686 // Okay, we have a legal flexible array member at the end of the struct. 9687 if (Record) 9688 Record->setHasFlexibleArrayMember(true); 9689 } else if (!FDTy->isDependentType() && 9690 RequireCompleteType(FD->getLocation(), FD->getType(), 9691 diag::err_field_incomplete)) { 9692 // Incomplete type 9693 FD->setInvalidDecl(); 9694 EnclosingDecl->setInvalidDecl(); 9695 continue; 9696 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9697 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9698 // If this is a member of a union, then entire union becomes "flexible". 9699 if (Record && Record->isUnion()) { 9700 Record->setHasFlexibleArrayMember(true); 9701 } else { 9702 // If this is a struct/class and this is not the last element, reject 9703 // it. Note that GCC supports variable sized arrays in the middle of 9704 // structures. 9705 if (i + 1 != Fields.end()) 9706 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9707 << FD->getDeclName() << FD->getType(); 9708 else { 9709 // We support flexible arrays at the end of structs in 9710 // other structs as an extension. 9711 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9712 << FD->getDeclName(); 9713 if (Record) 9714 Record->setHasFlexibleArrayMember(true); 9715 } 9716 } 9717 } 9718 if (Record && FDTTy->getDecl()->hasObjectMember()) 9719 Record->setHasObjectMember(true); 9720 } else if (FDTy->isObjCObjectType()) { 9721 /// A field cannot be an Objective-c object 9722 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9723 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9724 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9725 FD->setType(T); 9726 } 9727 else if (!getLangOpts().CPlusPlus) { 9728 if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported) { 9729 // It's an error in ARC if a field has lifetime. 9730 // We don't want to report this in a system header, though, 9731 // so we just make the field unavailable. 9732 // FIXME: that's really not sufficient; we need to make the type 9733 // itself invalid to, say, initialize or copy. 9734 QualType T = FD->getType(); 9735 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9736 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9737 SourceLocation loc = FD->getLocation(); 9738 if (getSourceManager().isInSystemHeader(loc)) { 9739 if (!FD->hasAttr<UnavailableAttr>()) { 9740 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9741 "this system field has retaining ownership")); 9742 } 9743 } else { 9744 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9745 << T->isBlockPointerType(); 9746 } 9747 ARCErrReported = true; 9748 } 9749 } 9750 else if (getLangOpts().ObjC1 && 9751 getLangOpts().getGC() != LangOptions::NonGC && 9752 Record && !Record->hasObjectMember()) { 9753 if (FD->getType()->isObjCObjectPointerType() || 9754 FD->getType().isObjCGCStrong()) 9755 Record->setHasObjectMember(true); 9756 else if (Context.getAsArrayType(FD->getType())) { 9757 QualType BaseType = Context.getBaseElementType(FD->getType()); 9758 if (BaseType->isRecordType() && 9759 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9760 Record->setHasObjectMember(true); 9761 else if (BaseType->isObjCObjectPointerType() || 9762 BaseType.isObjCGCStrong()) 9763 Record->setHasObjectMember(true); 9764 } 9765 } 9766 } 9767 // Keep track of the number of named members. 9768 if (FD->getIdentifier()) 9769 ++NumNamedMembers; 9770 } 9771 9772 // Okay, we successfully defined 'Record'. 9773 if (Record) { 9774 bool Completed = false; 9775 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9776 if (!CXXRecord->isInvalidDecl()) { 9777 // Set access bits correctly on the directly-declared conversions. 9778 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9779 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9780 I != E; ++I) 9781 Convs->setAccess(I, (*I)->getAccess()); 9782 9783 if (!CXXRecord->isDependentType()) { 9784 // Objective-C Automatic Reference Counting: 9785 // If a class has a non-static data member of Objective-C pointer 9786 // type (or array thereof), it is a non-POD type and its 9787 // default constructor (if any), copy constructor, copy assignment 9788 // operator, and destructor are non-trivial. 9789 // 9790 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9791 // However, here we check whether this particular class is only 9792 // non-POD because of the presence of an Objective-C pointer member. 9793 // If so, objects of this type cannot be shared between code compiled 9794 // with instant objects and code compiled with manual retain/release. 9795 if (getLangOpts().ObjCAutoRefCount && 9796 CXXRecord->hasObjectMember() && 9797 CXXRecord->getLinkage() == ExternalLinkage) { 9798 if (CXXRecord->isPOD()) { 9799 Diag(CXXRecord->getLocation(), 9800 diag::warn_arc_non_pod_class_with_object_member) 9801 << CXXRecord; 9802 } else { 9803 // FIXME: Fix-Its would be nice here, but finding a good location 9804 // for them is going to be tricky. 9805 if (CXXRecord->hasTrivialCopyConstructor()) 9806 Diag(CXXRecord->getLocation(), 9807 diag::warn_arc_trivial_member_function_with_object_member) 9808 << CXXRecord << 0; 9809 if (CXXRecord->hasTrivialCopyAssignment()) 9810 Diag(CXXRecord->getLocation(), 9811 diag::warn_arc_trivial_member_function_with_object_member) 9812 << CXXRecord << 1; 9813 if (CXXRecord->hasTrivialDestructor()) 9814 Diag(CXXRecord->getLocation(), 9815 diag::warn_arc_trivial_member_function_with_object_member) 9816 << CXXRecord << 2; 9817 } 9818 } 9819 9820 // Adjust user-defined destructor exception spec. 9821 if (getLangOpts().CPlusPlus0x && 9822 CXXRecord->hasUserDeclaredDestructor()) 9823 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9824 9825 // Add any implicitly-declared members to this class. 9826 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9827 9828 // If we have virtual base classes, we may end up finding multiple 9829 // final overriders for a given virtual function. Check for this 9830 // problem now. 9831 if (CXXRecord->getNumVBases()) { 9832 CXXFinalOverriderMap FinalOverriders; 9833 CXXRecord->getFinalOverriders(FinalOverriders); 9834 9835 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9836 MEnd = FinalOverriders.end(); 9837 M != MEnd; ++M) { 9838 for (OverridingMethods::iterator SO = M->second.begin(), 9839 SOEnd = M->second.end(); 9840 SO != SOEnd; ++SO) { 9841 assert(SO->second.size() > 0 && 9842 "Virtual function without overridding functions?"); 9843 if (SO->second.size() == 1) 9844 continue; 9845 9846 // C++ [class.virtual]p2: 9847 // In a derived class, if a virtual member function of a base 9848 // class subobject has more than one final overrider the 9849 // program is ill-formed. 9850 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9851 << (NamedDecl *)M->first << Record; 9852 Diag(M->first->getLocation(), 9853 diag::note_overridden_virtual_function); 9854 for (OverridingMethods::overriding_iterator 9855 OM = SO->second.begin(), 9856 OMEnd = SO->second.end(); 9857 OM != OMEnd; ++OM) 9858 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9859 << (NamedDecl *)M->first << OM->Method->getParent(); 9860 9861 Record->setInvalidDecl(); 9862 } 9863 } 9864 CXXRecord->completeDefinition(&FinalOverriders); 9865 Completed = true; 9866 } 9867 } 9868 } 9869 } 9870 9871 if (!Completed) 9872 Record->completeDefinition(); 9873 9874 } else { 9875 ObjCIvarDecl **ClsFields = 9876 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9877 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9878 ID->setEndOfDefinitionLoc(RBrac); 9879 // Add ivar's to class's DeclContext. 9880 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9881 ClsFields[i]->setLexicalDeclContext(ID); 9882 ID->addDecl(ClsFields[i]); 9883 } 9884 // Must enforce the rule that ivars in the base classes may not be 9885 // duplicates. 9886 if (ID->getSuperClass()) 9887 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9888 } else if (ObjCImplementationDecl *IMPDecl = 9889 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9890 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9891 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9892 // Ivar declared in @implementation never belongs to the implementation. 9893 // Only it is in implementation's lexical context. 9894 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9895 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9896 IMPDecl->setIvarLBraceLoc(LBrac); 9897 IMPDecl->setIvarRBraceLoc(RBrac); 9898 } else if (ObjCCategoryDecl *CDecl = 9899 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9900 // case of ivars in class extension; all other cases have been 9901 // reported as errors elsewhere. 9902 // FIXME. Class extension does not have a LocEnd field. 9903 // CDecl->setLocEnd(RBrac); 9904 // Add ivar's to class extension's DeclContext. 9905 // Diagnose redeclaration of private ivars. 9906 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9907 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9908 if (IDecl) { 9909 if (const ObjCIvarDecl *ClsIvar = 9910 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9911 Diag(ClsFields[i]->getLocation(), 9912 diag::err_duplicate_ivar_declaration); 9913 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9914 continue; 9915 } 9916 for (const ObjCCategoryDecl *ClsExtDecl = 9917 IDecl->getFirstClassExtension(); 9918 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9919 if (const ObjCIvarDecl *ClsExtIvar = 9920 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9921 Diag(ClsFields[i]->getLocation(), 9922 diag::err_duplicate_ivar_declaration); 9923 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9924 continue; 9925 } 9926 } 9927 } 9928 ClsFields[i]->setLexicalDeclContext(CDecl); 9929 CDecl->addDecl(ClsFields[i]); 9930 } 9931 CDecl->setIvarLBraceLoc(LBrac); 9932 CDecl->setIvarRBraceLoc(RBrac); 9933 } 9934 } 9935 9936 if (Attr) 9937 ProcessDeclAttributeList(S, Record, Attr); 9938 9939 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9940 // set the visibility of this record. 9941 if (Record && !Record->getDeclContext()->isRecord()) 9942 AddPushedVisibilityAttribute(Record); 9943} 9944 9945/// \brief Determine whether the given integral value is representable within 9946/// the given type T. 9947static bool isRepresentableIntegerValue(ASTContext &Context, 9948 llvm::APSInt &Value, 9949 QualType T) { 9950 assert(T->isIntegralType(Context) && "Integral type required!"); 9951 unsigned BitWidth = Context.getIntWidth(T); 9952 9953 if (Value.isUnsigned() || Value.isNonNegative()) { 9954 if (T->isSignedIntegerOrEnumerationType()) 9955 --BitWidth; 9956 return Value.getActiveBits() <= BitWidth; 9957 } 9958 return Value.getMinSignedBits() <= BitWidth; 9959} 9960 9961// \brief Given an integral type, return the next larger integral type 9962// (or a NULL type of no such type exists). 9963static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9964 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9965 // enum checking below. 9966 assert(T->isIntegralType(Context) && "Integral type required!"); 9967 const unsigned NumTypes = 4; 9968 QualType SignedIntegralTypes[NumTypes] = { 9969 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9970 }; 9971 QualType UnsignedIntegralTypes[NumTypes] = { 9972 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9973 Context.UnsignedLongLongTy 9974 }; 9975 9976 unsigned BitWidth = Context.getTypeSize(T); 9977 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9978 : UnsignedIntegralTypes; 9979 for (unsigned I = 0; I != NumTypes; ++I) 9980 if (Context.getTypeSize(Types[I]) > BitWidth) 9981 return Types[I]; 9982 9983 return QualType(); 9984} 9985 9986EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9987 EnumConstantDecl *LastEnumConst, 9988 SourceLocation IdLoc, 9989 IdentifierInfo *Id, 9990 Expr *Val) { 9991 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9992 llvm::APSInt EnumVal(IntWidth); 9993 QualType EltTy; 9994 9995 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9996 Val = 0; 9997 9998 if (Val) 9999 Val = DefaultLvalueConversion(Val).take(); 10000 10001 if (Val) { 10002 if (Enum->isDependentType() || Val->isTypeDependent()) 10003 EltTy = Context.DependentTy; 10004 else { 10005 SourceLocation ExpLoc; 10006 if (getLangOpts().CPlusPlus0x && Enum->isFixed() && 10007 !getLangOpts().MicrosoftMode) { 10008 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 10009 // constant-expression in the enumerator-definition shall be a converted 10010 // constant expression of the underlying type. 10011 EltTy = Enum->getIntegerType(); 10012 ExprResult Converted = 10013 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 10014 CCEK_Enumerator); 10015 if (Converted.isInvalid()) 10016 Val = 0; 10017 else 10018 Val = Converted.take(); 10019 } else if (!Val->isValueDependent() && 10020 !(Val = VerifyIntegerConstantExpression(Val, 10021 &EnumVal).take())) { 10022 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 10023 } else { 10024 if (Enum->isFixed()) { 10025 EltTy = Enum->getIntegerType(); 10026 10027 // In Obj-C and Microsoft mode, require the enumeration value to be 10028 // representable in the underlying type of the enumeration. In C++11, 10029 // we perform a non-narrowing conversion as part of converted constant 10030 // expression checking. 10031 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10032 if (getLangOpts().MicrosoftMode) { 10033 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 10034 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10035 } else 10036 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 10037 } else 10038 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10039 } else if (getLangOpts().CPlusPlus) { 10040 // C++11 [dcl.enum]p5: 10041 // If the underlying type is not fixed, the type of each enumerator 10042 // is the type of its initializing value: 10043 // - If an initializer is specified for an enumerator, the 10044 // initializing value has the same type as the expression. 10045 EltTy = Val->getType(); 10046 } else { 10047 // C99 6.7.2.2p2: 10048 // The expression that defines the value of an enumeration constant 10049 // shall be an integer constant expression that has a value 10050 // representable as an int. 10051 10052 // Complain if the value is not representable in an int. 10053 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 10054 Diag(IdLoc, diag::ext_enum_value_not_int) 10055 << EnumVal.toString(10) << Val->getSourceRange() 10056 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 10057 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 10058 // Force the type of the expression to 'int'. 10059 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 10060 } 10061 EltTy = Val->getType(); 10062 } 10063 } 10064 } 10065 } 10066 10067 if (!Val) { 10068 if (Enum->isDependentType()) 10069 EltTy = Context.DependentTy; 10070 else if (!LastEnumConst) { 10071 // C++0x [dcl.enum]p5: 10072 // If the underlying type is not fixed, the type of each enumerator 10073 // is the type of its initializing value: 10074 // - If no initializer is specified for the first enumerator, the 10075 // initializing value has an unspecified integral type. 10076 // 10077 // GCC uses 'int' for its unspecified integral type, as does 10078 // C99 6.7.2.2p3. 10079 if (Enum->isFixed()) { 10080 EltTy = Enum->getIntegerType(); 10081 } 10082 else { 10083 EltTy = Context.IntTy; 10084 } 10085 } else { 10086 // Assign the last value + 1. 10087 EnumVal = LastEnumConst->getInitVal(); 10088 ++EnumVal; 10089 EltTy = LastEnumConst->getType(); 10090 10091 // Check for overflow on increment. 10092 if (EnumVal < LastEnumConst->getInitVal()) { 10093 // C++0x [dcl.enum]p5: 10094 // If the underlying type is not fixed, the type of each enumerator 10095 // is the type of its initializing value: 10096 // 10097 // - Otherwise the type of the initializing value is the same as 10098 // the type of the initializing value of the preceding enumerator 10099 // unless the incremented value is not representable in that type, 10100 // in which case the type is an unspecified integral type 10101 // sufficient to contain the incremented value. If no such type 10102 // exists, the program is ill-formed. 10103 QualType T = getNextLargerIntegralType(Context, EltTy); 10104 if (T.isNull() || Enum->isFixed()) { 10105 // There is no integral type larger enough to represent this 10106 // value. Complain, then allow the value to wrap around. 10107 EnumVal = LastEnumConst->getInitVal(); 10108 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 10109 ++EnumVal; 10110 if (Enum->isFixed()) 10111 // When the underlying type is fixed, this is ill-formed. 10112 Diag(IdLoc, diag::err_enumerator_wrapped) 10113 << EnumVal.toString(10) 10114 << EltTy; 10115 else 10116 Diag(IdLoc, diag::warn_enumerator_too_large) 10117 << EnumVal.toString(10); 10118 } else { 10119 EltTy = T; 10120 } 10121 10122 // Retrieve the last enumerator's value, extent that type to the 10123 // type that is supposed to be large enough to represent the incremented 10124 // value, then increment. 10125 EnumVal = LastEnumConst->getInitVal(); 10126 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10127 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 10128 ++EnumVal; 10129 10130 // If we're not in C++, diagnose the overflow of enumerator values, 10131 // which in C99 means that the enumerator value is not representable in 10132 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 10133 // permits enumerator values that are representable in some larger 10134 // integral type. 10135 if (!getLangOpts().CPlusPlus && !T.isNull()) 10136 Diag(IdLoc, diag::warn_enum_value_overflow); 10137 } else if (!getLangOpts().CPlusPlus && 10138 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10139 // Enforce C99 6.7.2.2p2 even when we compute the next value. 10140 Diag(IdLoc, diag::ext_enum_value_not_int) 10141 << EnumVal.toString(10) << 1; 10142 } 10143 } 10144 } 10145 10146 if (!EltTy->isDependentType()) { 10147 // Make the enumerator value match the signedness and size of the 10148 // enumerator's type. 10149 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); 10150 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10151 } 10152 10153 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 10154 Val, EnumVal); 10155} 10156 10157 10158Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 10159 SourceLocation IdLoc, IdentifierInfo *Id, 10160 AttributeList *Attr, 10161 SourceLocation EqualLoc, Expr *Val) { 10162 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 10163 EnumConstantDecl *LastEnumConst = 10164 cast_or_null<EnumConstantDecl>(lastEnumConst); 10165 10166 // The scope passed in may not be a decl scope. Zip up the scope tree until 10167 // we find one that is. 10168 S = getNonFieldDeclScope(S); 10169 10170 // Verify that there isn't already something declared with this name in this 10171 // scope. 10172 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 10173 ForRedeclaration); 10174 if (PrevDecl && PrevDecl->isTemplateParameter()) { 10175 // Maybe we will complain about the shadowed template parameter. 10176 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 10177 // Just pretend that we didn't see the previous declaration. 10178 PrevDecl = 0; 10179 } 10180 10181 if (PrevDecl) { 10182 // When in C++, we may get a TagDecl with the same name; in this case the 10183 // enum constant will 'hide' the tag. 10184 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 10185 "Received TagDecl when not in C++!"); 10186 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 10187 if (isa<EnumConstantDecl>(PrevDecl)) 10188 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 10189 else 10190 Diag(IdLoc, diag::err_redefinition) << Id; 10191 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 10192 return 0; 10193 } 10194 } 10195 10196 // C++ [class.mem]p13: 10197 // If T is the name of a class, then each of the following shall have a 10198 // name different from T: 10199 // - every enumerator of every member of class T that is an enumerated 10200 // type 10201 if (CXXRecordDecl *Record 10202 = dyn_cast<CXXRecordDecl>( 10203 TheEnumDecl->getDeclContext()->getRedeclContext())) 10204 if (Record->getIdentifier() && Record->getIdentifier() == Id) 10205 Diag(IdLoc, diag::err_member_name_of_class) << Id; 10206 10207 EnumConstantDecl *New = 10208 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 10209 10210 if (New) { 10211 // Process attributes. 10212 if (Attr) ProcessDeclAttributeList(S, New, Attr); 10213 10214 // Register this decl in the current scope stack. 10215 New->setAccess(TheEnumDecl->getAccess()); 10216 PushOnScopeChains(New, S); 10217 } 10218 10219 return New; 10220} 10221 10222void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 10223 SourceLocation RBraceLoc, Decl *EnumDeclX, 10224 Decl **Elements, unsigned NumElements, 10225 Scope *S, AttributeList *Attr) { 10226 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 10227 QualType EnumType = Context.getTypeDeclType(Enum); 10228 10229 if (Attr) 10230 ProcessDeclAttributeList(S, Enum, Attr); 10231 10232 if (Enum->isDependentType()) { 10233 for (unsigned i = 0; i != NumElements; ++i) { 10234 EnumConstantDecl *ECD = 10235 cast_or_null<EnumConstantDecl>(Elements[i]); 10236 if (!ECD) continue; 10237 10238 ECD->setType(EnumType); 10239 } 10240 10241 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 10242 return; 10243 } 10244 10245 // TODO: If the result value doesn't fit in an int, it must be a long or long 10246 // long value. ISO C does not support this, but GCC does as an extension, 10247 // emit a warning. 10248 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10249 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 10250 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 10251 10252 // Verify that all the values are okay, compute the size of the values, and 10253 // reverse the list. 10254 unsigned NumNegativeBits = 0; 10255 unsigned NumPositiveBits = 0; 10256 10257 // Keep track of whether all elements have type int. 10258 bool AllElementsInt = true; 10259 10260 for (unsigned i = 0; i != NumElements; ++i) { 10261 EnumConstantDecl *ECD = 10262 cast_or_null<EnumConstantDecl>(Elements[i]); 10263 if (!ECD) continue; // Already issued a diagnostic. 10264 10265 const llvm::APSInt &InitVal = ECD->getInitVal(); 10266 10267 // Keep track of the size of positive and negative values. 10268 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 10269 NumPositiveBits = std::max(NumPositiveBits, 10270 (unsigned)InitVal.getActiveBits()); 10271 else 10272 NumNegativeBits = std::max(NumNegativeBits, 10273 (unsigned)InitVal.getMinSignedBits()); 10274 10275 // Keep track of whether every enum element has type int (very commmon). 10276 if (AllElementsInt) 10277 AllElementsInt = ECD->getType() == Context.IntTy; 10278 } 10279 10280 // Figure out the type that should be used for this enum. 10281 QualType BestType; 10282 unsigned BestWidth; 10283 10284 // C++0x N3000 [conv.prom]p3: 10285 // An rvalue of an unscoped enumeration type whose underlying 10286 // type is not fixed can be converted to an rvalue of the first 10287 // of the following types that can represent all the values of 10288 // the enumeration: int, unsigned int, long int, unsigned long 10289 // int, long long int, or unsigned long long int. 10290 // C99 6.4.4.3p2: 10291 // An identifier declared as an enumeration constant has type int. 10292 // The C99 rule is modified by a gcc extension 10293 QualType BestPromotionType; 10294 10295 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 10296 // -fshort-enums is the equivalent to specifying the packed attribute on all 10297 // enum definitions. 10298 if (LangOpts.ShortEnums) 10299 Packed = true; 10300 10301 if (Enum->isFixed()) { 10302 BestType = Enum->getIntegerType(); 10303 if (BestType->isPromotableIntegerType()) 10304 BestPromotionType = Context.getPromotedIntegerType(BestType); 10305 else 10306 BestPromotionType = BestType; 10307 // We don't need to set BestWidth, because BestType is going to be the type 10308 // of the enumerators, but we do anyway because otherwise some compilers 10309 // warn that it might be used uninitialized. 10310 BestWidth = CharWidth; 10311 } 10312 else if (NumNegativeBits) { 10313 // If there is a negative value, figure out the smallest integer type (of 10314 // int/long/longlong) that fits. 10315 // If it's packed, check also if it fits a char or a short. 10316 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 10317 BestType = Context.SignedCharTy; 10318 BestWidth = CharWidth; 10319 } else if (Packed && NumNegativeBits <= ShortWidth && 10320 NumPositiveBits < ShortWidth) { 10321 BestType = Context.ShortTy; 10322 BestWidth = ShortWidth; 10323 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 10324 BestType = Context.IntTy; 10325 BestWidth = IntWidth; 10326 } else { 10327 BestWidth = Context.getTargetInfo().getLongWidth(); 10328 10329 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 10330 BestType = Context.LongTy; 10331 } else { 10332 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10333 10334 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 10335 Diag(Enum->getLocation(), diag::warn_enum_too_large); 10336 BestType = Context.LongLongTy; 10337 } 10338 } 10339 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 10340 } else { 10341 // If there is no negative value, figure out the smallest type that fits 10342 // all of the enumerator values. 10343 // If it's packed, check also if it fits a char or a short. 10344 if (Packed && NumPositiveBits <= CharWidth) { 10345 BestType = Context.UnsignedCharTy; 10346 BestPromotionType = Context.IntTy; 10347 BestWidth = CharWidth; 10348 } else if (Packed && NumPositiveBits <= ShortWidth) { 10349 BestType = Context.UnsignedShortTy; 10350 BestPromotionType = Context.IntTy; 10351 BestWidth = ShortWidth; 10352 } else if (NumPositiveBits <= IntWidth) { 10353 BestType = Context.UnsignedIntTy; 10354 BestWidth = IntWidth; 10355 BestPromotionType 10356 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10357 ? Context.UnsignedIntTy : Context.IntTy; 10358 } else if (NumPositiveBits <= 10359 (BestWidth = Context.getTargetInfo().getLongWidth())) { 10360 BestType = Context.UnsignedLongTy; 10361 BestPromotionType 10362 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10363 ? Context.UnsignedLongTy : Context.LongTy; 10364 } else { 10365 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10366 assert(NumPositiveBits <= BestWidth && 10367 "How could an initializer get larger than ULL?"); 10368 BestType = Context.UnsignedLongLongTy; 10369 BestPromotionType 10370 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10371 ? Context.UnsignedLongLongTy : Context.LongLongTy; 10372 } 10373 } 10374 10375 // Loop over all of the enumerator constants, changing their types to match 10376 // the type of the enum if needed. 10377 for (unsigned i = 0; i != NumElements; ++i) { 10378 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10379 if (!ECD) continue; // Already issued a diagnostic. 10380 10381 // Standard C says the enumerators have int type, but we allow, as an 10382 // extension, the enumerators to be larger than int size. If each 10383 // enumerator value fits in an int, type it as an int, otherwise type it the 10384 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 10385 // that X has type 'int', not 'unsigned'. 10386 10387 // Determine whether the value fits into an int. 10388 llvm::APSInt InitVal = ECD->getInitVal(); 10389 10390 // If it fits into an integer type, force it. Otherwise force it to match 10391 // the enum decl type. 10392 QualType NewTy; 10393 unsigned NewWidth; 10394 bool NewSign; 10395 if (!getLangOpts().CPlusPlus && 10396 !Enum->isFixed() && 10397 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 10398 NewTy = Context.IntTy; 10399 NewWidth = IntWidth; 10400 NewSign = true; 10401 } else if (ECD->getType() == BestType) { 10402 // Already the right type! 10403 if (getLangOpts().CPlusPlus) 10404 // C++ [dcl.enum]p4: Following the closing brace of an 10405 // enum-specifier, each enumerator has the type of its 10406 // enumeration. 10407 ECD->setType(EnumType); 10408 continue; 10409 } else { 10410 NewTy = BestType; 10411 NewWidth = BestWidth; 10412 NewSign = BestType->isSignedIntegerOrEnumerationType(); 10413 } 10414 10415 // Adjust the APSInt value. 10416 InitVal = InitVal.extOrTrunc(NewWidth); 10417 InitVal.setIsSigned(NewSign); 10418 ECD->setInitVal(InitVal); 10419 10420 // Adjust the Expr initializer and type. 10421 if (ECD->getInitExpr() && 10422 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10423 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10424 CK_IntegralCast, 10425 ECD->getInitExpr(), 10426 /*base paths*/ 0, 10427 VK_RValue)); 10428 if (getLangOpts().CPlusPlus) 10429 // C++ [dcl.enum]p4: Following the closing brace of an 10430 // enum-specifier, each enumerator has the type of its 10431 // enumeration. 10432 ECD->setType(EnumType); 10433 else 10434 ECD->setType(NewTy); 10435 } 10436 10437 Enum->completeDefinition(BestType, BestPromotionType, 10438 NumPositiveBits, NumNegativeBits); 10439 10440 // If we're declaring a function, ensure this decl isn't forgotten about - 10441 // it needs to go into the function scope. 10442 if (InFunctionDeclarator) 10443 DeclsInPrototypeScope.push_back(Enum); 10444 10445} 10446 10447Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10448 SourceLocation StartLoc, 10449 SourceLocation EndLoc) { 10450 StringLiteral *AsmString = cast<StringLiteral>(expr); 10451 10452 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10453 AsmString, StartLoc, 10454 EndLoc); 10455 CurContext->addDecl(New); 10456 return New; 10457} 10458 10459DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10460 SourceLocation ImportLoc, 10461 ModuleIdPath Path) { 10462 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10463 Module::AllVisible, 10464 /*IsIncludeDirective=*/false); 10465 if (!Mod) 10466 return true; 10467 10468 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10469 Module *ModCheck = Mod; 10470 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10471 // If we've run out of module parents, just drop the remaining identifiers. 10472 // We need the length to be consistent. 10473 if (!ModCheck) 10474 break; 10475 ModCheck = ModCheck->Parent; 10476 10477 IdentifierLocs.push_back(Path[I].second); 10478 } 10479 10480 ImportDecl *Import = ImportDecl::Create(Context, 10481 Context.getTranslationUnitDecl(), 10482 AtLoc.isValid()? AtLoc : ImportLoc, 10483 Mod, IdentifierLocs); 10484 Context.getTranslationUnitDecl()->addDecl(Import); 10485 return Import; 10486} 10487 10488void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name, 10489 IdentifierInfo* AliasName, 10490 SourceLocation PragmaLoc, 10491 SourceLocation NameLoc, 10492 SourceLocation AliasNameLoc) { 10493 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, 10494 LookupOrdinaryName); 10495 AsmLabelAttr *Attr = 10496 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName()); 10497 10498 if (PrevDecl) 10499 PrevDecl->addAttr(Attr); 10500 else 10501 (void)ExtnameUndeclaredIdentifiers.insert( 10502 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr)); 10503} 10504 10505void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10506 SourceLocation PragmaLoc, 10507 SourceLocation NameLoc) { 10508 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10509 10510 if (PrevDecl) { 10511 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10512 } else { 10513 (void)WeakUndeclaredIdentifiers.insert( 10514 std::pair<IdentifierInfo*,WeakInfo> 10515 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10516 } 10517} 10518 10519void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10520 IdentifierInfo* AliasName, 10521 SourceLocation PragmaLoc, 10522 SourceLocation NameLoc, 10523 SourceLocation AliasNameLoc) { 10524 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10525 LookupOrdinaryName); 10526 WeakInfo W = WeakInfo(Name, NameLoc); 10527 10528 if (PrevDecl) { 10529 if (!PrevDecl->hasAttr<AliasAttr>()) 10530 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10531 DeclApplyPragmaWeak(TUScope, ND, W); 10532 } else { 10533 (void)WeakUndeclaredIdentifiers.insert( 10534 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10535 } 10536} 10537 10538Decl *Sema::getObjCDeclContext() const { 10539 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10540} 10541 10542AvailabilityResult Sema::getCurContextAvailability() const { 10543 const Decl *D = cast<Decl>(getCurLexicalContext()); 10544 // A category implicitly has the availability of the interface. 10545 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10546 D = CatD->getClassInterface(); 10547 10548 return D->getAvailability(); 10549} 10550