SemaDecl.cpp revision f4fe843aac730e2202b3c9c6c52649ee186ba788
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/ASTConsumer.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclCXX.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclTemplate.h" 27#include "clang/AST/EvaluatedExprVisitor.h" 28#include "clang/AST/ExprCXX.h" 29#include "clang/AST/StmtCXX.h" 30#include "clang/AST/CharUnits.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Parse/ParseDiagnostic.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Sema/DelayedDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "clang/Lex/ModuleLoader.h" 42#include "llvm/ADT/SmallString.h" 43#include "llvm/ADT/Triple.h" 44#include <algorithm> 45#include <cstring> 46#include <functional> 47using namespace clang; 48using namespace sema; 49 50Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 51 if (OwnedType) { 52 Decl *Group[2] = { OwnedType, Ptr }; 53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 54 } 55 56 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 57} 58 59namespace { 60 61class TypeNameValidatorCCC : public CorrectionCandidateCallback { 62 public: 63 TypeNameValidatorCCC(bool AllowInvalid) : AllowInvalidDecl(AllowInvalid) { 64 WantExpressionKeywords = false; 65 WantCXXNamedCasts = false; 66 WantRemainingKeywords = false; 67 } 68 69 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 70 if (NamedDecl *ND = candidate.getCorrectionDecl()) 71 return (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) && 72 (AllowInvalidDecl || !ND->isInvalidDecl()); 73 else 74 return candidate.isKeyword(); 75 } 76 77 private: 78 bool AllowInvalidDecl; 79}; 80 81} 82 83/// \brief If the identifier refers to a type name within this scope, 84/// return the declaration of that type. 85/// 86/// This routine performs ordinary name lookup of the identifier II 87/// within the given scope, with optional C++ scope specifier SS, to 88/// determine whether the name refers to a type. If so, returns an 89/// opaque pointer (actually a QualType) corresponding to that 90/// type. Otherwise, returns NULL. 91/// 92/// If name lookup results in an ambiguity, this routine will complain 93/// and then return NULL. 94ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 95 Scope *S, CXXScopeSpec *SS, 96 bool isClassName, bool HasTrailingDot, 97 ParsedType ObjectTypePtr, 98 bool IsCtorOrDtorName, 99 bool WantNontrivialTypeSourceInfo, 100 IdentifierInfo **CorrectedII) { 101 // Determine where we will perform name lookup. 102 DeclContext *LookupCtx = 0; 103 if (ObjectTypePtr) { 104 QualType ObjectType = ObjectTypePtr.get(); 105 if (ObjectType->isRecordType()) 106 LookupCtx = computeDeclContext(ObjectType); 107 } else if (SS && SS->isNotEmpty()) { 108 LookupCtx = computeDeclContext(*SS, false); 109 110 if (!LookupCtx) { 111 if (isDependentScopeSpecifier(*SS)) { 112 // C++ [temp.res]p3: 113 // A qualified-id that refers to a type and in which the 114 // nested-name-specifier depends on a template-parameter (14.6.2) 115 // shall be prefixed by the keyword typename to indicate that the 116 // qualified-id denotes a type, forming an 117 // elaborated-type-specifier (7.1.5.3). 118 // 119 // We therefore do not perform any name lookup if the result would 120 // refer to a member of an unknown specialization. 121 if (!isClassName && !IsCtorOrDtorName) 122 return ParsedType(); 123 124 // We know from the grammar that this name refers to a type, 125 // so build a dependent node to describe the type. 126 if (WantNontrivialTypeSourceInfo) 127 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 128 129 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 130 QualType T = 131 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 132 II, NameLoc); 133 134 return ParsedType::make(T); 135 } 136 137 return ParsedType(); 138 } 139 140 if (!LookupCtx->isDependentContext() && 141 RequireCompleteDeclContext(*SS, LookupCtx)) 142 return ParsedType(); 143 } 144 145 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 146 // lookup for class-names. 147 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 148 LookupOrdinaryName; 149 LookupResult Result(*this, &II, NameLoc, Kind); 150 if (LookupCtx) { 151 // Perform "qualified" name lookup into the declaration context we 152 // computed, which is either the type of the base of a member access 153 // expression or the declaration context associated with a prior 154 // nested-name-specifier. 155 LookupQualifiedName(Result, LookupCtx); 156 157 if (ObjectTypePtr && Result.empty()) { 158 // C++ [basic.lookup.classref]p3: 159 // If the unqualified-id is ~type-name, the type-name is looked up 160 // in the context of the entire postfix-expression. If the type T of 161 // the object expression is of a class type C, the type-name is also 162 // looked up in the scope of class C. At least one of the lookups shall 163 // find a name that refers to (possibly cv-qualified) T. 164 LookupName(Result, S); 165 } 166 } else { 167 // Perform unqualified name lookup. 168 LookupName(Result, S); 169 } 170 171 NamedDecl *IIDecl = 0; 172 switch (Result.getResultKind()) { 173 case LookupResult::NotFound: 174 case LookupResult::NotFoundInCurrentInstantiation: 175 if (CorrectedII) { 176 TypeNameValidatorCCC Validator(true); 177 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 178 Kind, S, SS, Validator); 179 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 180 TemplateTy Template; 181 bool MemberOfUnknownSpecialization; 182 UnqualifiedId TemplateName; 183 TemplateName.setIdentifier(NewII, NameLoc); 184 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 185 CXXScopeSpec NewSS, *NewSSPtr = SS; 186 if (SS && NNS) { 187 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 188 NewSSPtr = &NewSS; 189 } 190 if (Correction && (NNS || NewII != &II) && 191 // Ignore a correction to a template type as the to-be-corrected 192 // identifier is not a template (typo correction for template names 193 // is handled elsewhere). 194 !(getLangOpts().CPlusPlus && NewSSPtr && 195 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 196 false, Template, MemberOfUnknownSpecialization))) { 197 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 198 isClassName, HasTrailingDot, ObjectTypePtr, 199 IsCtorOrDtorName, 200 WantNontrivialTypeSourceInfo); 201 if (Ty) { 202 std::string CorrectedStr(Correction.getAsString(getLangOpts())); 203 std::string CorrectedQuotedStr( 204 Correction.getQuoted(getLangOpts())); 205 Diag(NameLoc, diag::err_unknown_typename_suggest) 206 << Result.getLookupName() << CorrectedQuotedStr 207 << FixItHint::CreateReplacement(SourceRange(NameLoc), 208 CorrectedStr); 209 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 210 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 211 << CorrectedQuotedStr; 212 213 if (SS && NNS) 214 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 215 *CorrectedII = NewII; 216 return Ty; 217 } 218 } 219 } 220 // If typo correction failed or was not performed, fall through 221 case LookupResult::FoundOverloaded: 222 case LookupResult::FoundUnresolvedValue: 223 Result.suppressDiagnostics(); 224 return ParsedType(); 225 226 case LookupResult::Ambiguous: 227 // Recover from type-hiding ambiguities by hiding the type. We'll 228 // do the lookup again when looking for an object, and we can 229 // diagnose the error then. If we don't do this, then the error 230 // about hiding the type will be immediately followed by an error 231 // that only makes sense if the identifier was treated like a type. 232 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 233 Result.suppressDiagnostics(); 234 return ParsedType(); 235 } 236 237 // Look to see if we have a type anywhere in the list of results. 238 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 239 Res != ResEnd; ++Res) { 240 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 241 if (!IIDecl || 242 (*Res)->getLocation().getRawEncoding() < 243 IIDecl->getLocation().getRawEncoding()) 244 IIDecl = *Res; 245 } 246 } 247 248 if (!IIDecl) { 249 // None of the entities we found is a type, so there is no way 250 // to even assume that the result is a type. In this case, don't 251 // complain about the ambiguity. The parser will either try to 252 // perform this lookup again (e.g., as an object name), which 253 // will produce the ambiguity, or will complain that it expected 254 // a type name. 255 Result.suppressDiagnostics(); 256 return ParsedType(); 257 } 258 259 // We found a type within the ambiguous lookup; diagnose the 260 // ambiguity and then return that type. This might be the right 261 // answer, or it might not be, but it suppresses any attempt to 262 // perform the name lookup again. 263 break; 264 265 case LookupResult::Found: 266 IIDecl = Result.getFoundDecl(); 267 break; 268 } 269 270 assert(IIDecl && "Didn't find decl"); 271 272 QualType T; 273 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 274 DiagnoseUseOfDecl(IIDecl, NameLoc); 275 276 if (T.isNull()) 277 T = Context.getTypeDeclType(TD); 278 279 // NOTE: avoid constructing an ElaboratedType(Loc) if this is a 280 // constructor or destructor name (in such a case, the scope specifier 281 // will be attached to the enclosing Expr or Decl node). 282 if (SS && SS->isNotEmpty() && !IsCtorOrDtorName) { 283 if (WantNontrivialTypeSourceInfo) { 284 // Construct a type with type-source information. 285 TypeLocBuilder Builder; 286 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 287 288 T = getElaboratedType(ETK_None, *SS, T); 289 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 290 ElabTL.setElaboratedKeywordLoc(SourceLocation()); 291 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 292 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 293 } else { 294 T = getElaboratedType(ETK_None, *SS, T); 295 } 296 } 297 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 298 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 299 if (!HasTrailingDot) 300 T = Context.getObjCInterfaceType(IDecl); 301 } 302 303 if (T.isNull()) { 304 // If it's not plausibly a type, suppress diagnostics. 305 Result.suppressDiagnostics(); 306 return ParsedType(); 307 } 308 return ParsedType::make(T); 309} 310 311/// isTagName() - This method is called *for error recovery purposes only* 312/// to determine if the specified name is a valid tag name ("struct foo"). If 313/// so, this returns the TST for the tag corresponding to it (TST_enum, 314/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 315/// where the user forgot to specify the tag. 316DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 317 // Do a tag name lookup in this scope. 318 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 319 LookupName(R, S, false); 320 R.suppressDiagnostics(); 321 if (R.getResultKind() == LookupResult::Found) 322 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 323 switch (TD->getTagKind()) { 324 case TTK_Struct: return DeclSpec::TST_struct; 325 case TTK_Union: return DeclSpec::TST_union; 326 case TTK_Class: return DeclSpec::TST_class; 327 case TTK_Enum: return DeclSpec::TST_enum; 328 } 329 } 330 331 return DeclSpec::TST_unspecified; 332} 333 334/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 335/// if a CXXScopeSpec's type is equal to the type of one of the base classes 336/// then downgrade the missing typename error to a warning. 337/// This is needed for MSVC compatibility; Example: 338/// @code 339/// template<class T> class A { 340/// public: 341/// typedef int TYPE; 342/// }; 343/// template<class T> class B : public A<T> { 344/// public: 345/// A<T>::TYPE a; // no typename required because A<T> is a base class. 346/// }; 347/// @endcode 348bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 349 if (CurContext->isRecord()) { 350 const Type *Ty = SS->getScopeRep()->getAsType(); 351 352 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 353 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 354 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 355 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 356 return true; 357 return S->isFunctionPrototypeScope(); 358 } 359 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 360} 361 362bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 363 SourceLocation IILoc, 364 Scope *S, 365 CXXScopeSpec *SS, 366 ParsedType &SuggestedType) { 367 // We don't have anything to suggest (yet). 368 SuggestedType = ParsedType(); 369 370 // There may have been a typo in the name of the type. Look up typo 371 // results, in case we have something that we can suggest. 372 TypeNameValidatorCCC Validator(false); 373 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 374 LookupOrdinaryName, S, SS, 375 Validator)) { 376 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 377 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 378 379 if (Corrected.isKeyword()) { 380 // We corrected to a keyword. 381 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 382 Diag(IILoc, diag::err_unknown_typename_suggest) 383 << &II << CorrectedQuotedStr; 384 } else { 385 NamedDecl *Result = Corrected.getCorrectionDecl(); 386 // We found a similarly-named type or interface; suggest that. 387 if (!SS || !SS->isSet()) 388 Diag(IILoc, diag::err_unknown_typename_suggest) 389 << &II << CorrectedQuotedStr 390 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 391 else if (DeclContext *DC = computeDeclContext(*SS, false)) 392 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 393 << &II << DC << CorrectedQuotedStr << SS->getRange() 394 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 395 else 396 llvm_unreachable("could not have corrected a typo here"); 397 398 Diag(Result->getLocation(), diag::note_previous_decl) 399 << CorrectedQuotedStr; 400 401 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 402 false, false, ParsedType(), 403 /*IsCtorOrDtorName=*/false, 404 /*NonTrivialTypeSourceInfo=*/true); 405 } 406 return true; 407 } 408 409 if (getLangOpts().CPlusPlus) { 410 // See if II is a class template that the user forgot to pass arguments to. 411 UnqualifiedId Name; 412 Name.setIdentifier(&II, IILoc); 413 CXXScopeSpec EmptySS; 414 TemplateTy TemplateResult; 415 bool MemberOfUnknownSpecialization; 416 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 417 Name, ParsedType(), true, TemplateResult, 418 MemberOfUnknownSpecialization) == TNK_Type_template) { 419 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 420 Diag(IILoc, diag::err_template_missing_args) << TplName; 421 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 422 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 423 << TplDecl->getTemplateParameters()->getSourceRange(); 424 } 425 return true; 426 } 427 } 428 429 // FIXME: Should we move the logic that tries to recover from a missing tag 430 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 431 432 if (!SS || (!SS->isSet() && !SS->isInvalid())) 433 Diag(IILoc, diag::err_unknown_typename) << &II; 434 else if (DeclContext *DC = computeDeclContext(*SS, false)) 435 Diag(IILoc, diag::err_typename_nested_not_found) 436 << &II << DC << SS->getRange(); 437 else if (isDependentScopeSpecifier(*SS)) { 438 unsigned DiagID = diag::err_typename_missing; 439 if (getLangOpts().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 440 DiagID = diag::warn_typename_missing; 441 442 Diag(SS->getRange().getBegin(), DiagID) 443 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 444 << SourceRange(SS->getRange().getBegin(), IILoc) 445 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 446 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 447 .get(); 448 } else { 449 assert(SS && SS->isInvalid() && 450 "Invalid scope specifier has already been diagnosed"); 451 } 452 453 return true; 454} 455 456/// \brief Determine whether the given result set contains either a type name 457/// or 458static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 459 bool CheckTemplate = R.getSema().getLangOpts().CPlusPlus && 460 NextToken.is(tok::less); 461 462 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 463 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 464 return true; 465 466 if (CheckTemplate && isa<TemplateDecl>(*I)) 467 return true; 468 } 469 470 return false; 471} 472 473static bool isTagTypeWithMissingTag(Sema &SemaRef, LookupResult &Result, 474 Scope *S, CXXScopeSpec &SS, 475 IdentifierInfo *&Name, 476 SourceLocation NameLoc) { 477 Result.clear(Sema::LookupTagName); 478 SemaRef.LookupParsedName(Result, S, &SS); 479 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 480 const char *TagName = 0; 481 const char *FixItTagName = 0; 482 switch (Tag->getTagKind()) { 483 case TTK_Class: 484 TagName = "class"; 485 FixItTagName = "class "; 486 break; 487 488 case TTK_Enum: 489 TagName = "enum"; 490 FixItTagName = "enum "; 491 break; 492 493 case TTK_Struct: 494 TagName = "struct"; 495 FixItTagName = "struct "; 496 break; 497 498 case TTK_Union: 499 TagName = "union"; 500 FixItTagName = "union "; 501 break; 502 } 503 504 SemaRef.Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 505 << Name << TagName << SemaRef.getLangOpts().CPlusPlus 506 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 507 508 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupOrdinaryName); 509 if (SemaRef.LookupParsedName(R, S, &SS)) { 510 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); 511 I != IEnd; ++I) 512 SemaRef.Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type) 513 << Name << TagName; 514 } 515 return true; 516 } 517 518 Result.clear(Sema::LookupOrdinaryName); 519 return false; 520} 521 522Sema::NameClassification Sema::ClassifyName(Scope *S, 523 CXXScopeSpec &SS, 524 IdentifierInfo *&Name, 525 SourceLocation NameLoc, 526 const Token &NextToken) { 527 DeclarationNameInfo NameInfo(Name, NameLoc); 528 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 529 530 if (NextToken.is(tok::coloncolon)) { 531 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 532 QualType(), false, SS, 0, false); 533 534 } 535 536 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 537 LookupParsedName(Result, S, &SS, !CurMethod); 538 539 // Perform lookup for Objective-C instance variables (including automatically 540 // synthesized instance variables), if we're in an Objective-C method. 541 // FIXME: This lookup really, really needs to be folded in to the normal 542 // unqualified lookup mechanism. 543 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 544 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 545 if (E.get() || E.isInvalid()) 546 return E; 547 } 548 549 bool SecondTry = false; 550 bool IsFilteredTemplateName = false; 551 552Corrected: 553 switch (Result.getResultKind()) { 554 case LookupResult::NotFound: 555 // If an unqualified-id is followed by a '(', then we have a function 556 // call. 557 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 558 // In C++, this is an ADL-only call. 559 // FIXME: Reference? 560 if (getLangOpts().CPlusPlus) 561 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 562 563 // C90 6.3.2.2: 564 // If the expression that precedes the parenthesized argument list in a 565 // function call consists solely of an identifier, and if no 566 // declaration is visible for this identifier, the identifier is 567 // implicitly declared exactly as if, in the innermost block containing 568 // the function call, the declaration 569 // 570 // extern int identifier (); 571 // 572 // appeared. 573 // 574 // We also allow this in C99 as an extension. 575 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 576 Result.addDecl(D); 577 Result.resolveKind(); 578 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 579 } 580 } 581 582 // In C, we first see whether there is a tag type by the same name, in 583 // which case it's likely that the user just forget to write "enum", 584 // "struct", or "union". 585 if (!getLangOpts().CPlusPlus && !SecondTry && 586 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) { 587 break; 588 } 589 590 // Perform typo correction to determine if there is another name that is 591 // close to this name. 592 if (!SecondTry) { 593 SecondTry = true; 594 CorrectionCandidateCallback DefaultValidator; 595 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 596 Result.getLookupKind(), S, 597 &SS, DefaultValidator)) { 598 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 599 unsigned QualifiedDiag = diag::err_no_member_suggest; 600 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 601 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 602 603 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 604 NamedDecl *UnderlyingFirstDecl 605 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 606 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 607 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 608 UnqualifiedDiag = diag::err_no_template_suggest; 609 QualifiedDiag = diag::err_no_member_template_suggest; 610 } else if (UnderlyingFirstDecl && 611 (isa<TypeDecl>(UnderlyingFirstDecl) || 612 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 613 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 614 UnqualifiedDiag = diag::err_unknown_typename_suggest; 615 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 616 } 617 618 if (SS.isEmpty()) 619 Diag(NameLoc, UnqualifiedDiag) 620 << Name << CorrectedQuotedStr 621 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 622 else 623 Diag(NameLoc, QualifiedDiag) 624 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 625 << SS.getRange() 626 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 627 628 // Update the name, so that the caller has the new name. 629 Name = Corrected.getCorrectionAsIdentifierInfo(); 630 631 // Typo correction corrected to a keyword. 632 if (Corrected.isKeyword()) 633 return Corrected.getCorrectionAsIdentifierInfo(); 634 635 // Also update the LookupResult... 636 // FIXME: This should probably go away at some point 637 Result.clear(); 638 Result.setLookupName(Corrected.getCorrection()); 639 if (FirstDecl) { 640 Result.addDecl(FirstDecl); 641 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 642 << CorrectedQuotedStr; 643 } 644 645 // If we found an Objective-C instance variable, let 646 // LookupInObjCMethod build the appropriate expression to 647 // reference the ivar. 648 // FIXME: This is a gross hack. 649 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 650 Result.clear(); 651 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 652 return move(E); 653 } 654 655 goto Corrected; 656 } 657 } 658 659 // We failed to correct; just fall through and let the parser deal with it. 660 Result.suppressDiagnostics(); 661 return NameClassification::Unknown(); 662 663 case LookupResult::NotFoundInCurrentInstantiation: { 664 // We performed name lookup into the current instantiation, and there were 665 // dependent bases, so we treat this result the same way as any other 666 // dependent nested-name-specifier. 667 668 // C++ [temp.res]p2: 669 // A name used in a template declaration or definition and that is 670 // dependent on a template-parameter is assumed not to name a type 671 // unless the applicable name lookup finds a type name or the name is 672 // qualified by the keyword typename. 673 // 674 // FIXME: If the next token is '<', we might want to ask the parser to 675 // perform some heroics to see if we actually have a 676 // template-argument-list, which would indicate a missing 'template' 677 // keyword here. 678 return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(), 679 NameInfo, /*TemplateArgs=*/0); 680 } 681 682 case LookupResult::Found: 683 case LookupResult::FoundOverloaded: 684 case LookupResult::FoundUnresolvedValue: 685 break; 686 687 case LookupResult::Ambiguous: 688 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 689 hasAnyAcceptableTemplateNames(Result)) { 690 // C++ [temp.local]p3: 691 // A lookup that finds an injected-class-name (10.2) can result in an 692 // ambiguity in certain cases (for example, if it is found in more than 693 // one base class). If all of the injected-class-names that are found 694 // refer to specializations of the same class template, and if the name 695 // is followed by a template-argument-list, the reference refers to the 696 // class template itself and not a specialization thereof, and is not 697 // ambiguous. 698 // 699 // This filtering can make an ambiguous result into an unambiguous one, 700 // so try again after filtering out template names. 701 FilterAcceptableTemplateNames(Result); 702 if (!Result.isAmbiguous()) { 703 IsFilteredTemplateName = true; 704 break; 705 } 706 } 707 708 // Diagnose the ambiguity and return an error. 709 return NameClassification::Error(); 710 } 711 712 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 713 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 714 // C++ [temp.names]p3: 715 // After name lookup (3.4) finds that a name is a template-name or that 716 // an operator-function-id or a literal- operator-id refers to a set of 717 // overloaded functions any member of which is a function template if 718 // this is followed by a <, the < is always taken as the delimiter of a 719 // template-argument-list and never as the less-than operator. 720 if (!IsFilteredTemplateName) 721 FilterAcceptableTemplateNames(Result); 722 723 if (!Result.empty()) { 724 bool IsFunctionTemplate; 725 TemplateName Template; 726 if (Result.end() - Result.begin() > 1) { 727 IsFunctionTemplate = true; 728 Template = Context.getOverloadedTemplateName(Result.begin(), 729 Result.end()); 730 } else { 731 TemplateDecl *TD 732 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 733 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 734 735 if (SS.isSet() && !SS.isInvalid()) 736 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 737 /*TemplateKeyword=*/false, 738 TD); 739 else 740 Template = TemplateName(TD); 741 } 742 743 if (IsFunctionTemplate) { 744 // Function templates always go through overload resolution, at which 745 // point we'll perform the various checks (e.g., accessibility) we need 746 // to based on which function we selected. 747 Result.suppressDiagnostics(); 748 749 return NameClassification::FunctionTemplate(Template); 750 } 751 752 return NameClassification::TypeTemplate(Template); 753 } 754 } 755 756 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 757 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 758 DiagnoseUseOfDecl(Type, NameLoc); 759 QualType T = Context.getTypeDeclType(Type); 760 return ParsedType::make(T); 761 } 762 763 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 764 if (!Class) { 765 // FIXME: It's unfortunate that we don't have a Type node for handling this. 766 if (ObjCCompatibleAliasDecl *Alias 767 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 768 Class = Alias->getClassInterface(); 769 } 770 771 if (Class) { 772 DiagnoseUseOfDecl(Class, NameLoc); 773 774 if (NextToken.is(tok::period)) { 775 // Interface. <something> is parsed as a property reference expression. 776 // Just return "unknown" as a fall-through for now. 777 Result.suppressDiagnostics(); 778 return NameClassification::Unknown(); 779 } 780 781 QualType T = Context.getObjCInterfaceType(Class); 782 return ParsedType::make(T); 783 } 784 785 // Check for a tag type hidden by a non-type decl in a few cases where it 786 // seems likely a type is wanted instead of the non-type that was found. 787 if (!getLangOpts().ObjC1 && FirstDecl && !isa<ClassTemplateDecl>(FirstDecl) && 788 !isa<TypeAliasTemplateDecl>(FirstDecl)) { 789 bool NextIsOp = NextToken.is(tok::amp) || NextToken.is(tok::star); 790 if ((NextToken.is(tok::identifier) || 791 (NextIsOp && FirstDecl->isFunctionOrFunctionTemplate())) && 792 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) { 793 FirstDecl = (*Result.begin())->getUnderlyingDecl(); 794 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 795 DiagnoseUseOfDecl(Type, NameLoc); 796 QualType T = Context.getTypeDeclType(Type); 797 return ParsedType::make(T); 798 } 799 } 800 } 801 802 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 803 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0); 804 805 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 806 return BuildDeclarationNameExpr(SS, Result, ADL); 807} 808 809// Determines the context to return to after temporarily entering a 810// context. This depends in an unnecessarily complicated way on the 811// exact ordering of callbacks from the parser. 812DeclContext *Sema::getContainingDC(DeclContext *DC) { 813 814 // Functions defined inline within classes aren't parsed until we've 815 // finished parsing the top-level class, so the top-level class is 816 // the context we'll need to return to. 817 if (isa<FunctionDecl>(DC)) { 818 DC = DC->getLexicalParent(); 819 820 // A function not defined within a class will always return to its 821 // lexical context. 822 if (!isa<CXXRecordDecl>(DC)) 823 return DC; 824 825 // A C++ inline method/friend is parsed *after* the topmost class 826 // it was declared in is fully parsed ("complete"); the topmost 827 // class is the context we need to return to. 828 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 829 DC = RD; 830 831 // Return the declaration context of the topmost class the inline method is 832 // declared in. 833 return DC; 834 } 835 836 return DC->getLexicalParent(); 837} 838 839void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 840 assert(getContainingDC(DC) == CurContext && 841 "The next DeclContext should be lexically contained in the current one."); 842 CurContext = DC; 843 S->setEntity(DC); 844} 845 846void Sema::PopDeclContext() { 847 assert(CurContext && "DeclContext imbalance!"); 848 849 CurContext = getContainingDC(CurContext); 850 assert(CurContext && "Popped translation unit!"); 851} 852 853/// EnterDeclaratorContext - Used when we must lookup names in the context 854/// of a declarator's nested name specifier. 855/// 856void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 857 // C++0x [basic.lookup.unqual]p13: 858 // A name used in the definition of a static data member of class 859 // X (after the qualified-id of the static member) is looked up as 860 // if the name was used in a member function of X. 861 // C++0x [basic.lookup.unqual]p14: 862 // If a variable member of a namespace is defined outside of the 863 // scope of its namespace then any name used in the definition of 864 // the variable member (after the declarator-id) is looked up as 865 // if the definition of the variable member occurred in its 866 // namespace. 867 // Both of these imply that we should push a scope whose context 868 // is the semantic context of the declaration. We can't use 869 // PushDeclContext here because that context is not necessarily 870 // lexically contained in the current context. Fortunately, 871 // the containing scope should have the appropriate information. 872 873 assert(!S->getEntity() && "scope already has entity"); 874 875#ifndef NDEBUG 876 Scope *Ancestor = S->getParent(); 877 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 878 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 879#endif 880 881 CurContext = DC; 882 S->setEntity(DC); 883} 884 885void Sema::ExitDeclaratorContext(Scope *S) { 886 assert(S->getEntity() == CurContext && "Context imbalance!"); 887 888 // Switch back to the lexical context. The safety of this is 889 // enforced by an assert in EnterDeclaratorContext. 890 Scope *Ancestor = S->getParent(); 891 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 892 CurContext = (DeclContext*) Ancestor->getEntity(); 893 894 // We don't need to do anything with the scope, which is going to 895 // disappear. 896} 897 898 899void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 900 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 901 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 902 // We assume that the caller has already called 903 // ActOnReenterTemplateScope 904 FD = TFD->getTemplatedDecl(); 905 } 906 if (!FD) 907 return; 908 909 // Same implementation as PushDeclContext, but enters the context 910 // from the lexical parent, rather than the top-level class. 911 assert(CurContext == FD->getLexicalParent() && 912 "The next DeclContext should be lexically contained in the current one."); 913 CurContext = FD; 914 S->setEntity(CurContext); 915 916 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 917 ParmVarDecl *Param = FD->getParamDecl(P); 918 // If the parameter has an identifier, then add it to the scope 919 if (Param->getIdentifier()) { 920 S->AddDecl(Param); 921 IdResolver.AddDecl(Param); 922 } 923 } 924} 925 926 927void Sema::ActOnExitFunctionContext() { 928 // Same implementation as PopDeclContext, but returns to the lexical parent, 929 // rather than the top-level class. 930 assert(CurContext && "DeclContext imbalance!"); 931 CurContext = CurContext->getLexicalParent(); 932 assert(CurContext && "Popped translation unit!"); 933} 934 935 936/// \brief Determine whether we allow overloading of the function 937/// PrevDecl with another declaration. 938/// 939/// This routine determines whether overloading is possible, not 940/// whether some new function is actually an overload. It will return 941/// true in C++ (where we can always provide overloads) or, as an 942/// extension, in C when the previous function is already an 943/// overloaded function declaration or has the "overloadable" 944/// attribute. 945static bool AllowOverloadingOfFunction(LookupResult &Previous, 946 ASTContext &Context) { 947 if (Context.getLangOpts().CPlusPlus) 948 return true; 949 950 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 951 return true; 952 953 return (Previous.getResultKind() == LookupResult::Found 954 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 955} 956 957/// Add this decl to the scope shadowed decl chains. 958void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 959 // Move up the scope chain until we find the nearest enclosing 960 // non-transparent context. The declaration will be introduced into this 961 // scope. 962 while (S->getEntity() && 963 ((DeclContext *)S->getEntity())->isTransparentContext()) 964 S = S->getParent(); 965 966 // Add scoped declarations into their context, so that they can be 967 // found later. Declarations without a context won't be inserted 968 // into any context. 969 if (AddToContext) 970 CurContext->addDecl(D); 971 972 // Out-of-line definitions shouldn't be pushed into scope in C++. 973 // Out-of-line variable and function definitions shouldn't even in C. 974 if ((getLangOpts().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 975 D->isOutOfLine() && 976 !D->getDeclContext()->getRedeclContext()->Equals( 977 D->getLexicalDeclContext()->getRedeclContext())) 978 return; 979 980 // Template instantiations should also not be pushed into scope. 981 if (isa<FunctionDecl>(D) && 982 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 983 return; 984 985 // If this replaces anything in the current scope, 986 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 987 IEnd = IdResolver.end(); 988 for (; I != IEnd; ++I) { 989 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 990 S->RemoveDecl(*I); 991 IdResolver.RemoveDecl(*I); 992 993 // Should only need to replace one decl. 994 break; 995 } 996 } 997 998 S->AddDecl(D); 999 1000 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 1001 // Implicitly-generated labels may end up getting generated in an order that 1002 // isn't strictly lexical, which breaks name lookup. Be careful to insert 1003 // the label at the appropriate place in the identifier chain. 1004 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 1005 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 1006 if (IDC == CurContext) { 1007 if (!S->isDeclScope(*I)) 1008 continue; 1009 } else if (IDC->Encloses(CurContext)) 1010 break; 1011 } 1012 1013 IdResolver.InsertDeclAfter(I, D); 1014 } else { 1015 IdResolver.AddDecl(D); 1016 } 1017} 1018 1019void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 1020 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 1021 TUScope->AddDecl(D); 1022} 1023 1024bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 1025 bool ExplicitInstantiationOrSpecialization) { 1026 return IdResolver.isDeclInScope(D, Ctx, Context, S, 1027 ExplicitInstantiationOrSpecialization); 1028} 1029 1030Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 1031 DeclContext *TargetDC = DC->getPrimaryContext(); 1032 do { 1033 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 1034 if (ScopeDC->getPrimaryContext() == TargetDC) 1035 return S; 1036 } while ((S = S->getParent())); 1037 1038 return 0; 1039} 1040 1041static bool isOutOfScopePreviousDeclaration(NamedDecl *, 1042 DeclContext*, 1043 ASTContext&); 1044 1045/// Filters out lookup results that don't fall within the given scope 1046/// as determined by isDeclInScope. 1047void Sema::FilterLookupForScope(LookupResult &R, 1048 DeclContext *Ctx, Scope *S, 1049 bool ConsiderLinkage, 1050 bool ExplicitInstantiationOrSpecialization) { 1051 LookupResult::Filter F = R.makeFilter(); 1052 while (F.hasNext()) { 1053 NamedDecl *D = F.next(); 1054 1055 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 1056 continue; 1057 1058 if (ConsiderLinkage && 1059 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 1060 continue; 1061 1062 F.erase(); 1063 } 1064 1065 F.done(); 1066} 1067 1068static bool isUsingDecl(NamedDecl *D) { 1069 return isa<UsingShadowDecl>(D) || 1070 isa<UnresolvedUsingTypenameDecl>(D) || 1071 isa<UnresolvedUsingValueDecl>(D); 1072} 1073 1074/// Removes using shadow declarations from the lookup results. 1075static void RemoveUsingDecls(LookupResult &R) { 1076 LookupResult::Filter F = R.makeFilter(); 1077 while (F.hasNext()) 1078 if (isUsingDecl(F.next())) 1079 F.erase(); 1080 1081 F.done(); 1082} 1083 1084/// \brief Check for this common pattern: 1085/// @code 1086/// class S { 1087/// S(const S&); // DO NOT IMPLEMENT 1088/// void operator=(const S&); // DO NOT IMPLEMENT 1089/// }; 1090/// @endcode 1091static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1092 // FIXME: Should check for private access too but access is set after we get 1093 // the decl here. 1094 if (D->doesThisDeclarationHaveABody()) 1095 return false; 1096 1097 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1098 return CD->isCopyConstructor(); 1099 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1100 return Method->isCopyAssignmentOperator(); 1101 return false; 1102} 1103 1104bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1105 assert(D); 1106 1107 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1108 return false; 1109 1110 // Ignore class templates. 1111 if (D->getDeclContext()->isDependentContext() || 1112 D->getLexicalDeclContext()->isDependentContext()) 1113 return false; 1114 1115 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1116 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1117 return false; 1118 1119 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1120 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1121 return false; 1122 } else { 1123 // 'static inline' functions are used in headers; don't warn. 1124 if (FD->getStorageClass() == SC_Static && 1125 FD->isInlineSpecified()) 1126 return false; 1127 } 1128 1129 if (FD->doesThisDeclarationHaveABody() && 1130 Context.DeclMustBeEmitted(FD)) 1131 return false; 1132 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1133 if (!VD->isFileVarDecl() || 1134 VD->getType().isConstant(Context) || 1135 Context.DeclMustBeEmitted(VD)) 1136 return false; 1137 1138 if (VD->isStaticDataMember() && 1139 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1140 return false; 1141 1142 } else { 1143 return false; 1144 } 1145 1146 // Only warn for unused decls internal to the translation unit. 1147 if (D->getLinkage() == ExternalLinkage) 1148 return false; 1149 1150 return true; 1151} 1152 1153void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1154 if (!D) 1155 return; 1156 1157 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1158 const FunctionDecl *First = FD->getFirstDeclaration(); 1159 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1160 return; // First should already be in the vector. 1161 } 1162 1163 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1164 const VarDecl *First = VD->getFirstDeclaration(); 1165 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1166 return; // First should already be in the vector. 1167 } 1168 1169 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1170 UnusedFileScopedDecls.push_back(D); 1171} 1172 1173static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1174 if (D->isInvalidDecl()) 1175 return false; 1176 1177 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1178 return false; 1179 1180 if (isa<LabelDecl>(D)) 1181 return true; 1182 1183 // White-list anything that isn't a local variable. 1184 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1185 !D->getDeclContext()->isFunctionOrMethod()) 1186 return false; 1187 1188 // Types of valid local variables should be complete, so this should succeed. 1189 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1190 1191 // White-list anything with an __attribute__((unused)) type. 1192 QualType Ty = VD->getType(); 1193 1194 // Only look at the outermost level of typedef. 1195 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1196 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1197 return false; 1198 } 1199 1200 // If we failed to complete the type for some reason, or if the type is 1201 // dependent, don't diagnose the variable. 1202 if (Ty->isIncompleteType() || Ty->isDependentType()) 1203 return false; 1204 1205 if (const TagType *TT = Ty->getAs<TagType>()) { 1206 const TagDecl *Tag = TT->getDecl(); 1207 if (Tag->hasAttr<UnusedAttr>()) 1208 return false; 1209 1210 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1211 if (!RD->hasTrivialDestructor()) 1212 return false; 1213 1214 if (const Expr *Init = VD->getInit()) { 1215 const CXXConstructExpr *Construct = 1216 dyn_cast<CXXConstructExpr>(Init); 1217 if (Construct && !Construct->isElidable()) { 1218 CXXConstructorDecl *CD = Construct->getConstructor(); 1219 if (!CD->isTrivial()) 1220 return false; 1221 } 1222 } 1223 } 1224 } 1225 1226 // TODO: __attribute__((unused)) templates? 1227 } 1228 1229 return true; 1230} 1231 1232static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1233 FixItHint &Hint) { 1234 if (isa<LabelDecl>(D)) { 1235 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1236 tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), true); 1237 if (AfterColon.isInvalid()) 1238 return; 1239 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1240 getCharRange(D->getLocStart(), AfterColon)); 1241 } 1242 return; 1243} 1244 1245/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1246/// unless they are marked attr(unused). 1247void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1248 FixItHint Hint; 1249 if (!ShouldDiagnoseUnusedDecl(D)) 1250 return; 1251 1252 GenerateFixForUnusedDecl(D, Context, Hint); 1253 1254 unsigned DiagID; 1255 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1256 DiagID = diag::warn_unused_exception_param; 1257 else if (isa<LabelDecl>(D)) 1258 DiagID = diag::warn_unused_label; 1259 else 1260 DiagID = diag::warn_unused_variable; 1261 1262 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1263} 1264 1265static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1266 // Verify that we have no forward references left. If so, there was a goto 1267 // or address of a label taken, but no definition of it. Label fwd 1268 // definitions are indicated with a null substmt. 1269 if (L->getStmt() == 0) 1270 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1271} 1272 1273void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1274 if (S->decl_empty()) return; 1275 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1276 "Scope shouldn't contain decls!"); 1277 1278 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1279 I != E; ++I) { 1280 Decl *TmpD = (*I); 1281 assert(TmpD && "This decl didn't get pushed??"); 1282 1283 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1284 NamedDecl *D = cast<NamedDecl>(TmpD); 1285 1286 if (!D->getDeclName()) continue; 1287 1288 // Diagnose unused variables in this scope. 1289 if (!S->hasErrorOccurred()) 1290 DiagnoseUnusedDecl(D); 1291 1292 // If this was a forward reference to a label, verify it was defined. 1293 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1294 CheckPoppedLabel(LD, *this); 1295 1296 // Remove this name from our lexical scope. 1297 IdResolver.RemoveDecl(D); 1298 } 1299} 1300 1301void Sema::ActOnStartFunctionDeclarator() { 1302 ++InFunctionDeclarator; 1303} 1304 1305void Sema::ActOnEndFunctionDeclarator() { 1306 assert(InFunctionDeclarator); 1307 --InFunctionDeclarator; 1308} 1309 1310/// \brief Look for an Objective-C class in the translation unit. 1311/// 1312/// \param Id The name of the Objective-C class we're looking for. If 1313/// typo-correction fixes this name, the Id will be updated 1314/// to the fixed name. 1315/// 1316/// \param IdLoc The location of the name in the translation unit. 1317/// 1318/// \param TypoCorrection If true, this routine will attempt typo correction 1319/// if there is no class with the given name. 1320/// 1321/// \returns The declaration of the named Objective-C class, or NULL if the 1322/// class could not be found. 1323ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1324 SourceLocation IdLoc, 1325 bool DoTypoCorrection) { 1326 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1327 // creation from this context. 1328 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1329 1330 if (!IDecl && DoTypoCorrection) { 1331 // Perform typo correction at the given location, but only if we 1332 // find an Objective-C class name. 1333 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1334 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1335 LookupOrdinaryName, TUScope, NULL, 1336 Validator)) { 1337 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1338 Diag(IdLoc, diag::err_undef_interface_suggest) 1339 << Id << IDecl->getDeclName() 1340 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1341 Diag(IDecl->getLocation(), diag::note_previous_decl) 1342 << IDecl->getDeclName(); 1343 1344 Id = IDecl->getIdentifier(); 1345 } 1346 } 1347 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1348 // This routine must always return a class definition, if any. 1349 if (Def && Def->getDefinition()) 1350 Def = Def->getDefinition(); 1351 return Def; 1352} 1353 1354/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1355/// from S, where a non-field would be declared. This routine copes 1356/// with the difference between C and C++ scoping rules in structs and 1357/// unions. For example, the following code is well-formed in C but 1358/// ill-formed in C++: 1359/// @code 1360/// struct S6 { 1361/// enum { BAR } e; 1362/// }; 1363/// 1364/// void test_S6() { 1365/// struct S6 a; 1366/// a.e = BAR; 1367/// } 1368/// @endcode 1369/// For the declaration of BAR, this routine will return a different 1370/// scope. The scope S will be the scope of the unnamed enumeration 1371/// within S6. In C++, this routine will return the scope associated 1372/// with S6, because the enumeration's scope is a transparent 1373/// context but structures can contain non-field names. In C, this 1374/// routine will return the translation unit scope, since the 1375/// enumeration's scope is a transparent context and structures cannot 1376/// contain non-field names. 1377Scope *Sema::getNonFieldDeclScope(Scope *S) { 1378 while (((S->getFlags() & Scope::DeclScope) == 0) || 1379 (S->getEntity() && 1380 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1381 (S->isClassScope() && !getLangOpts().CPlusPlus)) 1382 S = S->getParent(); 1383 return S; 1384} 1385 1386/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1387/// file scope. lazily create a decl for it. ForRedeclaration is true 1388/// if we're creating this built-in in anticipation of redeclaring the 1389/// built-in. 1390NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1391 Scope *S, bool ForRedeclaration, 1392 SourceLocation Loc) { 1393 Builtin::ID BID = (Builtin::ID)bid; 1394 1395 ASTContext::GetBuiltinTypeError Error; 1396 QualType R = Context.GetBuiltinType(BID, Error); 1397 switch (Error) { 1398 case ASTContext::GE_None: 1399 // Okay 1400 break; 1401 1402 case ASTContext::GE_Missing_stdio: 1403 if (ForRedeclaration) 1404 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1405 << Context.BuiltinInfo.GetName(BID); 1406 return 0; 1407 1408 case ASTContext::GE_Missing_setjmp: 1409 if (ForRedeclaration) 1410 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1411 << Context.BuiltinInfo.GetName(BID); 1412 return 0; 1413 1414 case ASTContext::GE_Missing_ucontext: 1415 if (ForRedeclaration) 1416 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1417 << Context.BuiltinInfo.GetName(BID); 1418 return 0; 1419 } 1420 1421 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1422 Diag(Loc, diag::ext_implicit_lib_function_decl) 1423 << Context.BuiltinInfo.GetName(BID) 1424 << R; 1425 if (Context.BuiltinInfo.getHeaderName(BID) && 1426 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1427 != DiagnosticsEngine::Ignored) 1428 Diag(Loc, diag::note_please_include_header) 1429 << Context.BuiltinInfo.getHeaderName(BID) 1430 << Context.BuiltinInfo.GetName(BID); 1431 } 1432 1433 FunctionDecl *New = FunctionDecl::Create(Context, 1434 Context.getTranslationUnitDecl(), 1435 Loc, Loc, II, R, /*TInfo=*/0, 1436 SC_Extern, 1437 SC_None, false, 1438 /*hasPrototype=*/true); 1439 New->setImplicit(); 1440 1441 // Create Decl objects for each parameter, adding them to the 1442 // FunctionDecl. 1443 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1444 SmallVector<ParmVarDecl*, 16> Params; 1445 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1446 ParmVarDecl *parm = 1447 ParmVarDecl::Create(Context, New, SourceLocation(), 1448 SourceLocation(), 0, 1449 FT->getArgType(i), /*TInfo=*/0, 1450 SC_None, SC_None, 0); 1451 parm->setScopeInfo(0, i); 1452 Params.push_back(parm); 1453 } 1454 New->setParams(Params); 1455 } 1456 1457 AddKnownFunctionAttributes(New); 1458 1459 // TUScope is the translation-unit scope to insert this function into. 1460 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1461 // relate Scopes to DeclContexts, and probably eliminate CurContext 1462 // entirely, but we're not there yet. 1463 DeclContext *SavedContext = CurContext; 1464 CurContext = Context.getTranslationUnitDecl(); 1465 PushOnScopeChains(New, TUScope); 1466 CurContext = SavedContext; 1467 return New; 1468} 1469 1470bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1471 QualType OldType; 1472 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1473 OldType = OldTypedef->getUnderlyingType(); 1474 else 1475 OldType = Context.getTypeDeclType(Old); 1476 QualType NewType = New->getUnderlyingType(); 1477 1478 if (NewType->isVariablyModifiedType()) { 1479 // Must not redefine a typedef with a variably-modified type. 1480 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1481 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1482 << Kind << NewType; 1483 if (Old->getLocation().isValid()) 1484 Diag(Old->getLocation(), diag::note_previous_definition); 1485 New->setInvalidDecl(); 1486 return true; 1487 } 1488 1489 if (OldType != NewType && 1490 !OldType->isDependentType() && 1491 !NewType->isDependentType() && 1492 !Context.hasSameType(OldType, NewType)) { 1493 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1494 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1495 << Kind << NewType << OldType; 1496 if (Old->getLocation().isValid()) 1497 Diag(Old->getLocation(), diag::note_previous_definition); 1498 New->setInvalidDecl(); 1499 return true; 1500 } 1501 return false; 1502} 1503 1504/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1505/// same name and scope as a previous declaration 'Old'. Figure out 1506/// how to resolve this situation, merging decls or emitting 1507/// diagnostics as appropriate. If there was an error, set New to be invalid. 1508/// 1509void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1510 // If the new decl is known invalid already, don't bother doing any 1511 // merging checks. 1512 if (New->isInvalidDecl()) return; 1513 1514 // Allow multiple definitions for ObjC built-in typedefs. 1515 // FIXME: Verify the underlying types are equivalent! 1516 if (getLangOpts().ObjC1) { 1517 const IdentifierInfo *TypeID = New->getIdentifier(); 1518 switch (TypeID->getLength()) { 1519 default: break; 1520 case 2: 1521 { 1522 if (!TypeID->isStr("id")) 1523 break; 1524 QualType T = New->getUnderlyingType(); 1525 if (!T->isPointerType()) 1526 break; 1527 if (!T->isVoidPointerType()) { 1528 QualType PT = T->getAs<PointerType>()->getPointeeType(); 1529 if (!PT->isStructureType()) 1530 break; 1531 } 1532 Context.setObjCIdRedefinitionType(T); 1533 // Install the built-in type for 'id', ignoring the current definition. 1534 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1535 return; 1536 } 1537 case 5: 1538 if (!TypeID->isStr("Class")) 1539 break; 1540 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1541 // Install the built-in type for 'Class', ignoring the current definition. 1542 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1543 return; 1544 case 3: 1545 if (!TypeID->isStr("SEL")) 1546 break; 1547 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1548 // Install the built-in type for 'SEL', ignoring the current definition. 1549 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1550 return; 1551 } 1552 // Fall through - the typedef name was not a builtin type. 1553 } 1554 1555 // Verify the old decl was also a type. 1556 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1557 if (!Old) { 1558 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1559 << New->getDeclName(); 1560 1561 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1562 if (OldD->getLocation().isValid()) 1563 Diag(OldD->getLocation(), diag::note_previous_definition); 1564 1565 return New->setInvalidDecl(); 1566 } 1567 1568 // If the old declaration is invalid, just give up here. 1569 if (Old->isInvalidDecl()) 1570 return New->setInvalidDecl(); 1571 1572 // If the typedef types are not identical, reject them in all languages and 1573 // with any extensions enabled. 1574 if (isIncompatibleTypedef(Old, New)) 1575 return; 1576 1577 // The types match. Link up the redeclaration chain if the old 1578 // declaration was a typedef. 1579 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1580 New->setPreviousDeclaration(Typedef); 1581 1582 if (getLangOpts().MicrosoftExt) 1583 return; 1584 1585 if (getLangOpts().CPlusPlus) { 1586 // C++ [dcl.typedef]p2: 1587 // In a given non-class scope, a typedef specifier can be used to 1588 // redefine the name of any type declared in that scope to refer 1589 // to the type to which it already refers. 1590 if (!isa<CXXRecordDecl>(CurContext)) 1591 return; 1592 1593 // C++0x [dcl.typedef]p4: 1594 // In a given class scope, a typedef specifier can be used to redefine 1595 // any class-name declared in that scope that is not also a typedef-name 1596 // to refer to the type to which it already refers. 1597 // 1598 // This wording came in via DR424, which was a correction to the 1599 // wording in DR56, which accidentally banned code like: 1600 // 1601 // struct S { 1602 // typedef struct A { } A; 1603 // }; 1604 // 1605 // in the C++03 standard. We implement the C++0x semantics, which 1606 // allow the above but disallow 1607 // 1608 // struct S { 1609 // typedef int I; 1610 // typedef int I; 1611 // }; 1612 // 1613 // since that was the intent of DR56. 1614 if (!isa<TypedefNameDecl>(Old)) 1615 return; 1616 1617 Diag(New->getLocation(), diag::err_redefinition) 1618 << New->getDeclName(); 1619 Diag(Old->getLocation(), diag::note_previous_definition); 1620 return New->setInvalidDecl(); 1621 } 1622 1623 // Modules always permit redefinition of typedefs, as does C11. 1624 if (getLangOpts().Modules || getLangOpts().C11) 1625 return; 1626 1627 // If we have a redefinition of a typedef in C, emit a warning. This warning 1628 // is normally mapped to an error, but can be controlled with 1629 // -Wtypedef-redefinition. If either the original or the redefinition is 1630 // in a system header, don't emit this for compatibility with GCC. 1631 if (getDiagnostics().getSuppressSystemWarnings() && 1632 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1633 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1634 return; 1635 1636 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1637 << New->getDeclName(); 1638 Diag(Old->getLocation(), diag::note_previous_definition); 1639 return; 1640} 1641 1642/// DeclhasAttr - returns true if decl Declaration already has the target 1643/// attribute. 1644static bool 1645DeclHasAttr(const Decl *D, const Attr *A) { 1646 // There can be multiple AvailabilityAttr in a Decl. Make sure we copy 1647 // all of them. It is mergeAvailabilityAttr in SemaDeclAttr.cpp that is 1648 // responsible for making sure they are consistent. 1649 const AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(A); 1650 if (AA) 1651 return false; 1652 1653 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1654 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1655 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1656 if ((*i)->getKind() == A->getKind()) { 1657 if (Ann) { 1658 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1659 return true; 1660 continue; 1661 } 1662 // FIXME: Don't hardcode this check 1663 if (OA && isa<OwnershipAttr>(*i)) 1664 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1665 return true; 1666 } 1667 1668 return false; 1669} 1670 1671bool Sema::mergeDeclAttribute(Decl *D, InheritableAttr *Attr) { 1672 InheritableAttr *NewAttr = NULL; 1673 if (AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(Attr)) 1674 NewAttr = mergeAvailabilityAttr(D, AA->getRange(), AA->getPlatform(), 1675 AA->getIntroduced(), AA->getDeprecated(), 1676 AA->getObsoleted(), AA->getUnavailable(), 1677 AA->getMessage()); 1678 else if (VisibilityAttr *VA = dyn_cast<VisibilityAttr>(Attr)) 1679 NewAttr = mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility()); 1680 else if (DLLImportAttr *ImportA = dyn_cast<DLLImportAttr>(Attr)) 1681 NewAttr = mergeDLLImportAttr(D, ImportA->getRange()); 1682 else if (DLLExportAttr *ExportA = dyn_cast<DLLExportAttr>(Attr)) 1683 NewAttr = mergeDLLExportAttr(D, ExportA->getRange()); 1684 else if (FormatAttr *FA = dyn_cast<FormatAttr>(Attr)) 1685 NewAttr = mergeFormatAttr(D, FA->getRange(), FA->getType(), 1686 FA->getFormatIdx(), FA->getFirstArg()); 1687 else if (SectionAttr *SA = dyn_cast<SectionAttr>(Attr)) 1688 NewAttr = mergeSectionAttr(D, SA->getRange(), SA->getName()); 1689 else if (!DeclHasAttr(D, Attr)) 1690 NewAttr = cast<InheritableAttr>(Attr->clone(Context)); 1691 1692 if (NewAttr) { 1693 NewAttr->setInherited(true); 1694 D->addAttr(NewAttr); 1695 return true; 1696 } 1697 1698 return false; 1699} 1700 1701static const Decl *getDefinition(Decl *D) { 1702 if (TagDecl *TD = dyn_cast<TagDecl>(D)) 1703 return TD->getDefinition(); 1704 if (VarDecl *VD = dyn_cast<VarDecl>(D)) 1705 return VD->getDefinition(); 1706 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1707 const FunctionDecl* Def; 1708 if (FD->hasBody(Def)) 1709 return Def; 1710 } 1711 return NULL; 1712} 1713 1714/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1715void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1716 bool MergeDeprecation) { 1717 // attributes declared post-definition are currently ignored 1718 const Decl *Def = getDefinition(Old); 1719 if (Def && Def != New && New->hasAttrs()) { 1720 Diag(New->getLocation(), diag::warn_attribute_precede_definition); 1721 Diag(Def->getLocation(), diag::note_previous_definition); 1722 New->dropAttrs(); 1723 } 1724 1725 if (!Old->hasAttrs()) 1726 return; 1727 1728 bool foundAny = New->hasAttrs(); 1729 1730 // Ensure that any moving of objects within the allocated map is done before 1731 // we process them. 1732 if (!foundAny) New->setAttrs(AttrVec()); 1733 1734 for (specific_attr_iterator<InheritableAttr> 1735 i = Old->specific_attr_begin<InheritableAttr>(), 1736 e = Old->specific_attr_end<InheritableAttr>(); 1737 i != e; ++i) { 1738 // Ignore deprecated/unavailable/availability attributes if requested. 1739 if (!MergeDeprecation && 1740 (isa<DeprecatedAttr>(*i) || 1741 isa<UnavailableAttr>(*i) || 1742 isa<AvailabilityAttr>(*i))) 1743 continue; 1744 1745 if (mergeDeclAttribute(New, *i)) 1746 foundAny = true; 1747 } 1748 1749 if (!foundAny) New->dropAttrs(); 1750} 1751 1752/// mergeParamDeclAttributes - Copy attributes from the old parameter 1753/// to the new one. 1754static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1755 const ParmVarDecl *oldDecl, 1756 ASTContext &C) { 1757 if (!oldDecl->hasAttrs()) 1758 return; 1759 1760 bool foundAny = newDecl->hasAttrs(); 1761 1762 // Ensure that any moving of objects within the allocated map is 1763 // done before we process them. 1764 if (!foundAny) newDecl->setAttrs(AttrVec()); 1765 1766 for (specific_attr_iterator<InheritableParamAttr> 1767 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1768 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1769 if (!DeclHasAttr(newDecl, *i)) { 1770 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1771 newAttr->setInherited(true); 1772 newDecl->addAttr(newAttr); 1773 foundAny = true; 1774 } 1775 } 1776 1777 if (!foundAny) newDecl->dropAttrs(); 1778} 1779 1780namespace { 1781 1782/// Used in MergeFunctionDecl to keep track of function parameters in 1783/// C. 1784struct GNUCompatibleParamWarning { 1785 ParmVarDecl *OldParm; 1786 ParmVarDecl *NewParm; 1787 QualType PromotedType; 1788}; 1789 1790} 1791 1792/// getSpecialMember - get the special member enum for a method. 1793Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1794 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1795 if (Ctor->isDefaultConstructor()) 1796 return Sema::CXXDefaultConstructor; 1797 1798 if (Ctor->isCopyConstructor()) 1799 return Sema::CXXCopyConstructor; 1800 1801 if (Ctor->isMoveConstructor()) 1802 return Sema::CXXMoveConstructor; 1803 } else if (isa<CXXDestructorDecl>(MD)) { 1804 return Sema::CXXDestructor; 1805 } else if (MD->isCopyAssignmentOperator()) { 1806 return Sema::CXXCopyAssignment; 1807 } else if (MD->isMoveAssignmentOperator()) { 1808 return Sema::CXXMoveAssignment; 1809 } 1810 1811 return Sema::CXXInvalid; 1812} 1813 1814/// canRedefineFunction - checks if a function can be redefined. Currently, 1815/// only extern inline functions can be redefined, and even then only in 1816/// GNU89 mode. 1817static bool canRedefineFunction(const FunctionDecl *FD, 1818 const LangOptions& LangOpts) { 1819 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1820 !LangOpts.CPlusPlus && 1821 FD->isInlineSpecified() && 1822 FD->getStorageClass() == SC_Extern); 1823} 1824 1825/// MergeFunctionDecl - We just parsed a function 'New' from 1826/// declarator D which has the same name and scope as a previous 1827/// declaration 'Old'. Figure out how to resolve this situation, 1828/// merging decls or emitting diagnostics as appropriate. 1829/// 1830/// In C++, New and Old must be declarations that are not 1831/// overloaded. Use IsOverload to determine whether New and Old are 1832/// overloaded, and to select the Old declaration that New should be 1833/// merged with. 1834/// 1835/// Returns true if there was an error, false otherwise. 1836bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) { 1837 // Verify the old decl was also a function. 1838 FunctionDecl *Old = 0; 1839 if (FunctionTemplateDecl *OldFunctionTemplate 1840 = dyn_cast<FunctionTemplateDecl>(OldD)) 1841 Old = OldFunctionTemplate->getTemplatedDecl(); 1842 else 1843 Old = dyn_cast<FunctionDecl>(OldD); 1844 if (!Old) { 1845 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1846 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1847 Diag(Shadow->getTargetDecl()->getLocation(), 1848 diag::note_using_decl_target); 1849 Diag(Shadow->getUsingDecl()->getLocation(), 1850 diag::note_using_decl) << 0; 1851 return true; 1852 } 1853 1854 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1855 << New->getDeclName(); 1856 Diag(OldD->getLocation(), diag::note_previous_definition); 1857 return true; 1858 } 1859 1860 // Determine whether the previous declaration was a definition, 1861 // implicit declaration, or a declaration. 1862 diag::kind PrevDiag; 1863 if (Old->isThisDeclarationADefinition()) 1864 PrevDiag = diag::note_previous_definition; 1865 else if (Old->isImplicit()) 1866 PrevDiag = diag::note_previous_implicit_declaration; 1867 else 1868 PrevDiag = diag::note_previous_declaration; 1869 1870 QualType OldQType = Context.getCanonicalType(Old->getType()); 1871 QualType NewQType = Context.getCanonicalType(New->getType()); 1872 1873 // Don't complain about this if we're in GNU89 mode and the old function 1874 // is an extern inline function. 1875 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1876 New->getStorageClass() == SC_Static && 1877 Old->getStorageClass() != SC_Static && 1878 !canRedefineFunction(Old, getLangOpts())) { 1879 if (getLangOpts().MicrosoftExt) { 1880 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1881 Diag(Old->getLocation(), PrevDiag); 1882 } else { 1883 Diag(New->getLocation(), diag::err_static_non_static) << New; 1884 Diag(Old->getLocation(), PrevDiag); 1885 return true; 1886 } 1887 } 1888 1889 // If a function is first declared with a calling convention, but is 1890 // later declared or defined without one, the second decl assumes the 1891 // calling convention of the first. 1892 // 1893 // For the new decl, we have to look at the NON-canonical type to tell the 1894 // difference between a function that really doesn't have a calling 1895 // convention and one that is declared cdecl. That's because in 1896 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1897 // because it is the default calling convention. 1898 // 1899 // Note also that we DO NOT return at this point, because we still have 1900 // other tests to run. 1901 const FunctionType *OldType = cast<FunctionType>(OldQType); 1902 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1903 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1904 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1905 bool RequiresAdjustment = false; 1906 if (OldTypeInfo.getCC() != CC_Default && 1907 NewTypeInfo.getCC() == CC_Default) { 1908 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1909 RequiresAdjustment = true; 1910 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1911 NewTypeInfo.getCC())) { 1912 // Calling conventions really aren't compatible, so complain. 1913 Diag(New->getLocation(), diag::err_cconv_change) 1914 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1915 << (OldTypeInfo.getCC() == CC_Default) 1916 << (OldTypeInfo.getCC() == CC_Default ? "" : 1917 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1918 Diag(Old->getLocation(), diag::note_previous_declaration); 1919 return true; 1920 } 1921 1922 // FIXME: diagnose the other way around? 1923 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1924 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1925 RequiresAdjustment = true; 1926 } 1927 1928 // Merge regparm attribute. 1929 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1930 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1931 if (NewTypeInfo.getHasRegParm()) { 1932 Diag(New->getLocation(), diag::err_regparm_mismatch) 1933 << NewType->getRegParmType() 1934 << OldType->getRegParmType(); 1935 Diag(Old->getLocation(), diag::note_previous_declaration); 1936 return true; 1937 } 1938 1939 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1940 RequiresAdjustment = true; 1941 } 1942 1943 // Merge ns_returns_retained attribute. 1944 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1945 if (NewTypeInfo.getProducesResult()) { 1946 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1947 Diag(Old->getLocation(), diag::note_previous_declaration); 1948 return true; 1949 } 1950 1951 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1952 RequiresAdjustment = true; 1953 } 1954 1955 if (RequiresAdjustment) { 1956 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1957 New->setType(QualType(NewType, 0)); 1958 NewQType = Context.getCanonicalType(New->getType()); 1959 } 1960 1961 if (getLangOpts().CPlusPlus) { 1962 // (C++98 13.1p2): 1963 // Certain function declarations cannot be overloaded: 1964 // -- Function declarations that differ only in the return type 1965 // cannot be overloaded. 1966 QualType OldReturnType = OldType->getResultType(); 1967 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1968 QualType ResQT; 1969 if (OldReturnType != NewReturnType) { 1970 if (NewReturnType->isObjCObjectPointerType() 1971 && OldReturnType->isObjCObjectPointerType()) 1972 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1973 if (ResQT.isNull()) { 1974 if (New->isCXXClassMember() && New->isOutOfLine()) 1975 Diag(New->getLocation(), 1976 diag::err_member_def_does_not_match_ret_type) << New; 1977 else 1978 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1979 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1980 return true; 1981 } 1982 else 1983 NewQType = ResQT; 1984 } 1985 1986 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1987 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1988 if (OldMethod && NewMethod) { 1989 // Preserve triviality. 1990 NewMethod->setTrivial(OldMethod->isTrivial()); 1991 1992 // MSVC allows explicit template specialization at class scope: 1993 // 2 CXMethodDecls referring to the same function will be injected. 1994 // We don't want a redeclartion error. 1995 bool IsClassScopeExplicitSpecialization = 1996 OldMethod->isFunctionTemplateSpecialization() && 1997 NewMethod->isFunctionTemplateSpecialization(); 1998 bool isFriend = NewMethod->getFriendObjectKind(); 1999 2000 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 2001 !IsClassScopeExplicitSpecialization) { 2002 // -- Member function declarations with the same name and the 2003 // same parameter types cannot be overloaded if any of them 2004 // is a static member function declaration. 2005 if (OldMethod->isStatic() || NewMethod->isStatic()) { 2006 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 2007 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2008 return true; 2009 } 2010 2011 // C++ [class.mem]p1: 2012 // [...] A member shall not be declared twice in the 2013 // member-specification, except that a nested class or member 2014 // class template can be declared and then later defined. 2015 unsigned NewDiag; 2016 if (isa<CXXConstructorDecl>(OldMethod)) 2017 NewDiag = diag::err_constructor_redeclared; 2018 else if (isa<CXXDestructorDecl>(NewMethod)) 2019 NewDiag = diag::err_destructor_redeclared; 2020 else if (isa<CXXConversionDecl>(NewMethod)) 2021 NewDiag = diag::err_conv_function_redeclared; 2022 else 2023 NewDiag = diag::err_member_redeclared; 2024 2025 Diag(New->getLocation(), NewDiag); 2026 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2027 2028 // Complain if this is an explicit declaration of a special 2029 // member that was initially declared implicitly. 2030 // 2031 // As an exception, it's okay to befriend such methods in order 2032 // to permit the implicit constructor/destructor/operator calls. 2033 } else if (OldMethod->isImplicit()) { 2034 if (isFriend) { 2035 NewMethod->setImplicit(); 2036 } else { 2037 Diag(NewMethod->getLocation(), 2038 diag::err_definition_of_implicitly_declared_member) 2039 << New << getSpecialMember(OldMethod); 2040 return true; 2041 } 2042 } else if (OldMethod->isExplicitlyDefaulted() && !isFriend) { 2043 Diag(NewMethod->getLocation(), 2044 diag::err_definition_of_explicitly_defaulted_member) 2045 << getSpecialMember(OldMethod); 2046 return true; 2047 } 2048 } 2049 2050 // (C++98 8.3.5p3): 2051 // All declarations for a function shall agree exactly in both the 2052 // return type and the parameter-type-list. 2053 // We also want to respect all the extended bits except noreturn. 2054 2055 // noreturn should now match unless the old type info didn't have it. 2056 QualType OldQTypeForComparison = OldQType; 2057 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 2058 assert(OldQType == QualType(OldType, 0)); 2059 const FunctionType *OldTypeForComparison 2060 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 2061 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 2062 assert(OldQTypeForComparison.isCanonical()); 2063 } 2064 2065 if (OldQTypeForComparison == NewQType) 2066 return MergeCompatibleFunctionDecls(New, Old, S); 2067 2068 // Fall through for conflicting redeclarations and redefinitions. 2069 } 2070 2071 // C: Function types need to be compatible, not identical. This handles 2072 // duplicate function decls like "void f(int); void f(enum X);" properly. 2073 if (!getLangOpts().CPlusPlus && 2074 Context.typesAreCompatible(OldQType, NewQType)) { 2075 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 2076 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 2077 const FunctionProtoType *OldProto = 0; 2078 if (isa<FunctionNoProtoType>(NewFuncType) && 2079 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 2080 // The old declaration provided a function prototype, but the 2081 // new declaration does not. Merge in the prototype. 2082 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 2083 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 2084 OldProto->arg_type_end()); 2085 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 2086 ParamTypes.data(), ParamTypes.size(), 2087 OldProto->getExtProtoInfo()); 2088 New->setType(NewQType); 2089 New->setHasInheritedPrototype(); 2090 2091 // Synthesize a parameter for each argument type. 2092 SmallVector<ParmVarDecl*, 16> Params; 2093 for (FunctionProtoType::arg_type_iterator 2094 ParamType = OldProto->arg_type_begin(), 2095 ParamEnd = OldProto->arg_type_end(); 2096 ParamType != ParamEnd; ++ParamType) { 2097 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 2098 SourceLocation(), 2099 SourceLocation(), 0, 2100 *ParamType, /*TInfo=*/0, 2101 SC_None, SC_None, 2102 0); 2103 Param->setScopeInfo(0, Params.size()); 2104 Param->setImplicit(); 2105 Params.push_back(Param); 2106 } 2107 2108 New->setParams(Params); 2109 } 2110 2111 return MergeCompatibleFunctionDecls(New, Old, S); 2112 } 2113 2114 // GNU C permits a K&R definition to follow a prototype declaration 2115 // if the declared types of the parameters in the K&R definition 2116 // match the types in the prototype declaration, even when the 2117 // promoted types of the parameters from the K&R definition differ 2118 // from the types in the prototype. GCC then keeps the types from 2119 // the prototype. 2120 // 2121 // If a variadic prototype is followed by a non-variadic K&R definition, 2122 // the K&R definition becomes variadic. This is sort of an edge case, but 2123 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2124 // C99 6.9.1p8. 2125 if (!getLangOpts().CPlusPlus && 2126 Old->hasPrototype() && !New->hasPrototype() && 2127 New->getType()->getAs<FunctionProtoType>() && 2128 Old->getNumParams() == New->getNumParams()) { 2129 SmallVector<QualType, 16> ArgTypes; 2130 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2131 const FunctionProtoType *OldProto 2132 = Old->getType()->getAs<FunctionProtoType>(); 2133 const FunctionProtoType *NewProto 2134 = New->getType()->getAs<FunctionProtoType>(); 2135 2136 // Determine whether this is the GNU C extension. 2137 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2138 NewProto->getResultType()); 2139 bool LooseCompatible = !MergedReturn.isNull(); 2140 for (unsigned Idx = 0, End = Old->getNumParams(); 2141 LooseCompatible && Idx != End; ++Idx) { 2142 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2143 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2144 if (Context.typesAreCompatible(OldParm->getType(), 2145 NewProto->getArgType(Idx))) { 2146 ArgTypes.push_back(NewParm->getType()); 2147 } else if (Context.typesAreCompatible(OldParm->getType(), 2148 NewParm->getType(), 2149 /*CompareUnqualified=*/true)) { 2150 GNUCompatibleParamWarning Warn 2151 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2152 Warnings.push_back(Warn); 2153 ArgTypes.push_back(NewParm->getType()); 2154 } else 2155 LooseCompatible = false; 2156 } 2157 2158 if (LooseCompatible) { 2159 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2160 Diag(Warnings[Warn].NewParm->getLocation(), 2161 diag::ext_param_promoted_not_compatible_with_prototype) 2162 << Warnings[Warn].PromotedType 2163 << Warnings[Warn].OldParm->getType(); 2164 if (Warnings[Warn].OldParm->getLocation().isValid()) 2165 Diag(Warnings[Warn].OldParm->getLocation(), 2166 diag::note_previous_declaration); 2167 } 2168 2169 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2170 ArgTypes.size(), 2171 OldProto->getExtProtoInfo())); 2172 return MergeCompatibleFunctionDecls(New, Old, S); 2173 } 2174 2175 // Fall through to diagnose conflicting types. 2176 } 2177 2178 // A function that has already been declared has been redeclared or defined 2179 // with a different type- show appropriate diagnostic 2180 if (unsigned BuiltinID = Old->getBuiltinID()) { 2181 // The user has declared a builtin function with an incompatible 2182 // signature. 2183 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2184 // The function the user is redeclaring is a library-defined 2185 // function like 'malloc' or 'printf'. Warn about the 2186 // redeclaration, then pretend that we don't know about this 2187 // library built-in. 2188 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2189 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2190 << Old << Old->getType(); 2191 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2192 Old->setInvalidDecl(); 2193 return false; 2194 } 2195 2196 PrevDiag = diag::note_previous_builtin_declaration; 2197 } 2198 2199 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2200 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2201 return true; 2202} 2203 2204/// \brief Completes the merge of two function declarations that are 2205/// known to be compatible. 2206/// 2207/// This routine handles the merging of attributes and other 2208/// properties of function declarations form the old declaration to 2209/// the new declaration, once we know that New is in fact a 2210/// redeclaration of Old. 2211/// 2212/// \returns false 2213bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old, 2214 Scope *S) { 2215 // Merge the attributes 2216 mergeDeclAttributes(New, Old); 2217 2218 // Merge the storage class. 2219 if (Old->getStorageClass() != SC_Extern && 2220 Old->getStorageClass() != SC_None) 2221 New->setStorageClass(Old->getStorageClass()); 2222 2223 // Merge "pure" flag. 2224 if (Old->isPure()) 2225 New->setPure(); 2226 2227 // Merge attributes from the parameters. These can mismatch with K&R 2228 // declarations. 2229 if (New->getNumParams() == Old->getNumParams()) 2230 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2231 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2232 Context); 2233 2234 if (getLangOpts().CPlusPlus) 2235 return MergeCXXFunctionDecl(New, Old, S); 2236 2237 return false; 2238} 2239 2240 2241void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2242 ObjCMethodDecl *oldMethod) { 2243 2244 // Merge the attributes, including deprecated/unavailable 2245 mergeDeclAttributes(newMethod, oldMethod, /* mergeDeprecation */true); 2246 2247 // Merge attributes from the parameters. 2248 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(), 2249 oe = oldMethod->param_end(); 2250 for (ObjCMethodDecl::param_iterator 2251 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2252 ni != ne && oi != oe; ++ni, ++oi) 2253 mergeParamDeclAttributes(*ni, *oi, Context); 2254 2255 CheckObjCMethodOverride(newMethod, oldMethod, true); 2256} 2257 2258/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2259/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2260/// emitting diagnostics as appropriate. 2261/// 2262/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2263/// to here in AddInitializerToDecl. We can't check them before the initializer 2264/// is attached. 2265void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2266 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2267 return; 2268 2269 QualType MergedT; 2270 if (getLangOpts().CPlusPlus) { 2271 AutoType *AT = New->getType()->getContainedAutoType(); 2272 if (AT && !AT->isDeduced()) { 2273 // We don't know what the new type is until the initializer is attached. 2274 return; 2275 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2276 // These could still be something that needs exception specs checked. 2277 return MergeVarDeclExceptionSpecs(New, Old); 2278 } 2279 // C++ [basic.link]p10: 2280 // [...] the types specified by all declarations referring to a given 2281 // object or function shall be identical, except that declarations for an 2282 // array object can specify array types that differ by the presence or 2283 // absence of a major array bound (8.3.4). 2284 else if (Old->getType()->isIncompleteArrayType() && 2285 New->getType()->isArrayType()) { 2286 CanQual<ArrayType> OldArray 2287 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2288 CanQual<ArrayType> NewArray 2289 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2290 if (OldArray->getElementType() == NewArray->getElementType()) 2291 MergedT = New->getType(); 2292 } else if (Old->getType()->isArrayType() && 2293 New->getType()->isIncompleteArrayType()) { 2294 CanQual<ArrayType> OldArray 2295 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2296 CanQual<ArrayType> NewArray 2297 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2298 if (OldArray->getElementType() == NewArray->getElementType()) 2299 MergedT = Old->getType(); 2300 } else if (New->getType()->isObjCObjectPointerType() 2301 && Old->getType()->isObjCObjectPointerType()) { 2302 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2303 Old->getType()); 2304 } 2305 } else { 2306 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2307 } 2308 if (MergedT.isNull()) { 2309 Diag(New->getLocation(), diag::err_redefinition_different_type) 2310 << New->getDeclName(); 2311 Diag(Old->getLocation(), diag::note_previous_definition); 2312 return New->setInvalidDecl(); 2313 } 2314 New->setType(MergedT); 2315} 2316 2317/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2318/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2319/// situation, merging decls or emitting diagnostics as appropriate. 2320/// 2321/// Tentative definition rules (C99 6.9.2p2) are checked by 2322/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2323/// definitions here, since the initializer hasn't been attached. 2324/// 2325void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2326 // If the new decl is already invalid, don't do any other checking. 2327 if (New->isInvalidDecl()) 2328 return; 2329 2330 // Verify the old decl was also a variable. 2331 VarDecl *Old = 0; 2332 if (!Previous.isSingleResult() || 2333 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2334 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2335 << New->getDeclName(); 2336 Diag(Previous.getRepresentativeDecl()->getLocation(), 2337 diag::note_previous_definition); 2338 return New->setInvalidDecl(); 2339 } 2340 2341 // C++ [class.mem]p1: 2342 // A member shall not be declared twice in the member-specification [...] 2343 // 2344 // Here, we need only consider static data members. 2345 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2346 Diag(New->getLocation(), diag::err_duplicate_member) 2347 << New->getIdentifier(); 2348 Diag(Old->getLocation(), diag::note_previous_declaration); 2349 New->setInvalidDecl(); 2350 } 2351 2352 mergeDeclAttributes(New, Old); 2353 // Warn if an already-declared variable is made a weak_import in a subsequent 2354 // declaration 2355 if (New->getAttr<WeakImportAttr>() && 2356 Old->getStorageClass() == SC_None && 2357 !Old->getAttr<WeakImportAttr>()) { 2358 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2359 Diag(Old->getLocation(), diag::note_previous_definition); 2360 // Remove weak_import attribute on new declaration. 2361 New->dropAttr<WeakImportAttr>(); 2362 } 2363 2364 // Merge the types. 2365 MergeVarDeclTypes(New, Old); 2366 if (New->isInvalidDecl()) 2367 return; 2368 2369 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2370 if (New->getStorageClass() == SC_Static && 2371 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2372 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2373 Diag(Old->getLocation(), diag::note_previous_definition); 2374 return New->setInvalidDecl(); 2375 } 2376 // C99 6.2.2p4: 2377 // For an identifier declared with the storage-class specifier 2378 // extern in a scope in which a prior declaration of that 2379 // identifier is visible,23) if the prior declaration specifies 2380 // internal or external linkage, the linkage of the identifier at 2381 // the later declaration is the same as the linkage specified at 2382 // the prior declaration. If no prior declaration is visible, or 2383 // if the prior declaration specifies no linkage, then the 2384 // identifier has external linkage. 2385 if (New->hasExternalStorage() && Old->hasLinkage()) 2386 /* Okay */; 2387 else if (New->getStorageClass() != SC_Static && 2388 Old->getStorageClass() == SC_Static) { 2389 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2390 Diag(Old->getLocation(), diag::note_previous_definition); 2391 return New->setInvalidDecl(); 2392 } 2393 2394 // Check if extern is followed by non-extern and vice-versa. 2395 if (New->hasExternalStorage() && 2396 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2397 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2398 Diag(Old->getLocation(), diag::note_previous_definition); 2399 return New->setInvalidDecl(); 2400 } 2401 if (Old->hasExternalStorage() && 2402 !New->hasLinkage() && New->isLocalVarDecl()) { 2403 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2404 Diag(Old->getLocation(), diag::note_previous_definition); 2405 return New->setInvalidDecl(); 2406 } 2407 2408 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2409 2410 // FIXME: The test for external storage here seems wrong? We still 2411 // need to check for mismatches. 2412 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2413 // Don't complain about out-of-line definitions of static members. 2414 !(Old->getLexicalDeclContext()->isRecord() && 2415 !New->getLexicalDeclContext()->isRecord())) { 2416 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2417 Diag(Old->getLocation(), diag::note_previous_definition); 2418 return New->setInvalidDecl(); 2419 } 2420 2421 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2422 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2423 Diag(Old->getLocation(), diag::note_previous_definition); 2424 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2425 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2426 Diag(Old->getLocation(), diag::note_previous_definition); 2427 } 2428 2429 // C++ doesn't have tentative definitions, so go right ahead and check here. 2430 const VarDecl *Def; 2431 if (getLangOpts().CPlusPlus && 2432 New->isThisDeclarationADefinition() == VarDecl::Definition && 2433 (Def = Old->getDefinition())) { 2434 Diag(New->getLocation(), diag::err_redefinition) 2435 << New->getDeclName(); 2436 Diag(Def->getLocation(), diag::note_previous_definition); 2437 New->setInvalidDecl(); 2438 return; 2439 } 2440 // c99 6.2.2 P4. 2441 // For an identifier declared with the storage-class specifier extern in a 2442 // scope in which a prior declaration of that identifier is visible, if 2443 // the prior declaration specifies internal or external linkage, the linkage 2444 // of the identifier at the later declaration is the same as the linkage 2445 // specified at the prior declaration. 2446 // FIXME. revisit this code. 2447 if (New->hasExternalStorage() && 2448 Old->getLinkage() == InternalLinkage && 2449 New->getDeclContext() == Old->getDeclContext()) 2450 New->setStorageClass(Old->getStorageClass()); 2451 2452 // Keep a chain of previous declarations. 2453 New->setPreviousDeclaration(Old); 2454 2455 // Inherit access appropriately. 2456 New->setAccess(Old->getAccess()); 2457} 2458 2459/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2460/// no declarator (e.g. "struct foo;") is parsed. 2461Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2462 DeclSpec &DS) { 2463 return ParsedFreeStandingDeclSpec(S, AS, DS, 2464 MultiTemplateParamsArg(*this, 0, 0)); 2465} 2466 2467/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2468/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2469/// parameters to cope with template friend declarations. 2470Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2471 DeclSpec &DS, 2472 MultiTemplateParamsArg TemplateParams) { 2473 Decl *TagD = 0; 2474 TagDecl *Tag = 0; 2475 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2476 DS.getTypeSpecType() == DeclSpec::TST_struct || 2477 DS.getTypeSpecType() == DeclSpec::TST_union || 2478 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2479 TagD = DS.getRepAsDecl(); 2480 2481 if (!TagD) // We probably had an error 2482 return 0; 2483 2484 // Note that the above type specs guarantee that the 2485 // type rep is a Decl, whereas in many of the others 2486 // it's a Type. 2487 if (isa<TagDecl>(TagD)) 2488 Tag = cast<TagDecl>(TagD); 2489 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2490 Tag = CTD->getTemplatedDecl(); 2491 } 2492 2493 if (Tag) { 2494 Tag->setFreeStanding(); 2495 if (Tag->isInvalidDecl()) 2496 return Tag; 2497 } 2498 2499 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2500 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2501 // or incomplete types shall not be restrict-qualified." 2502 if (TypeQuals & DeclSpec::TQ_restrict) 2503 Diag(DS.getRestrictSpecLoc(), 2504 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2505 << DS.getSourceRange(); 2506 } 2507 2508 if (DS.isConstexprSpecified()) { 2509 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2510 // and definitions of functions and variables. 2511 if (Tag) 2512 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2513 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2514 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2515 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2516 else 2517 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2518 // Don't emit warnings after this error. 2519 return TagD; 2520 } 2521 2522 if (DS.isFriendSpecified()) { 2523 // If we're dealing with a decl but not a TagDecl, assume that 2524 // whatever routines created it handled the friendship aspect. 2525 if (TagD && !Tag) 2526 return 0; 2527 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2528 } 2529 2530 // Track whether we warned about the fact that there aren't any 2531 // declarators. 2532 bool emittedWarning = false; 2533 2534 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2535 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2536 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2537 if (getLangOpts().CPlusPlus || 2538 Record->getDeclContext()->isRecord()) 2539 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2540 2541 Diag(DS.getLocStart(), diag::ext_no_declarators) 2542 << DS.getSourceRange(); 2543 emittedWarning = true; 2544 } 2545 } 2546 2547 // Check for Microsoft C extension: anonymous struct. 2548 if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus && 2549 CurContext->isRecord() && 2550 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2551 // Handle 2 kinds of anonymous struct: 2552 // struct STRUCT; 2553 // and 2554 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2555 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2556 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2557 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2558 DS.getRepAsType().get()->isStructureType())) { 2559 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct) 2560 << DS.getSourceRange(); 2561 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2562 } 2563 } 2564 2565 if (getLangOpts().CPlusPlus && 2566 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2567 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2568 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2569 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2570 Diag(Enum->getLocation(), diag::ext_no_declarators) 2571 << DS.getSourceRange(); 2572 emittedWarning = true; 2573 } 2574 2575 // Skip all the checks below if we have a type error. 2576 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2577 2578 if (!DS.isMissingDeclaratorOk()) { 2579 // Warn about typedefs of enums without names, since this is an 2580 // extension in both Microsoft and GNU. 2581 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2582 Tag && isa<EnumDecl>(Tag)) { 2583 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name) 2584 << DS.getSourceRange(); 2585 return Tag; 2586 } 2587 2588 Diag(DS.getLocStart(), diag::ext_no_declarators) 2589 << DS.getSourceRange(); 2590 emittedWarning = true; 2591 } 2592 2593 // We're going to complain about a bunch of spurious specifiers; 2594 // only do this if we're declaring a tag, because otherwise we 2595 // should be getting diag::ext_no_declarators. 2596 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2597 return TagD; 2598 2599 // Note that a linkage-specification sets a storage class, but 2600 // 'extern "C" struct foo;' is actually valid and not theoretically 2601 // useless. 2602 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2603 if (!DS.isExternInLinkageSpec()) 2604 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2605 << DeclSpec::getSpecifierName(scs); 2606 2607 if (DS.isThreadSpecified()) 2608 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2609 if (DS.getTypeQualifiers()) { 2610 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2611 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2612 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2613 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2614 // Restrict is covered above. 2615 } 2616 if (DS.isInlineSpecified()) 2617 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2618 if (DS.isVirtualSpecified()) 2619 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2620 if (DS.isExplicitSpecified()) 2621 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2622 2623 if (DS.isModulePrivateSpecified() && 2624 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2625 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2626 << Tag->getTagKind() 2627 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2628 2629 // Warn about ignored type attributes, for example: 2630 // __attribute__((aligned)) struct A; 2631 // Attributes should be placed after tag to apply to type declaration. 2632 if (!DS.getAttributes().empty()) { 2633 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2634 if (TypeSpecType == DeclSpec::TST_class || 2635 TypeSpecType == DeclSpec::TST_struct || 2636 TypeSpecType == DeclSpec::TST_union || 2637 TypeSpecType == DeclSpec::TST_enum) { 2638 AttributeList* attrs = DS.getAttributes().getList(); 2639 while (attrs) { 2640 Diag(attrs->getScopeLoc(), 2641 diag::warn_declspec_attribute_ignored) 2642 << attrs->getName() 2643 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2644 TypeSpecType == DeclSpec::TST_struct ? 1 : 2645 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2646 attrs = attrs->getNext(); 2647 } 2648 } 2649 } 2650 2651 return TagD; 2652} 2653 2654/// We are trying to inject an anonymous member into the given scope; 2655/// check if there's an existing declaration that can't be overloaded. 2656/// 2657/// \return true if this is a forbidden redeclaration 2658static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2659 Scope *S, 2660 DeclContext *Owner, 2661 DeclarationName Name, 2662 SourceLocation NameLoc, 2663 unsigned diagnostic) { 2664 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2665 Sema::ForRedeclaration); 2666 if (!SemaRef.LookupName(R, S)) return false; 2667 2668 if (R.getAsSingle<TagDecl>()) 2669 return false; 2670 2671 // Pick a representative declaration. 2672 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2673 assert(PrevDecl && "Expected a non-null Decl"); 2674 2675 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2676 return false; 2677 2678 SemaRef.Diag(NameLoc, diagnostic) << Name; 2679 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2680 2681 return true; 2682} 2683 2684/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2685/// anonymous struct or union AnonRecord into the owning context Owner 2686/// and scope S. This routine will be invoked just after we realize 2687/// that an unnamed union or struct is actually an anonymous union or 2688/// struct, e.g., 2689/// 2690/// @code 2691/// union { 2692/// int i; 2693/// float f; 2694/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2695/// // f into the surrounding scope.x 2696/// @endcode 2697/// 2698/// This routine is recursive, injecting the names of nested anonymous 2699/// structs/unions into the owning context and scope as well. 2700static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2701 DeclContext *Owner, 2702 RecordDecl *AnonRecord, 2703 AccessSpecifier AS, 2704 SmallVector<NamedDecl*, 2> &Chaining, 2705 bool MSAnonStruct) { 2706 unsigned diagKind 2707 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2708 : diag::err_anonymous_struct_member_redecl; 2709 2710 bool Invalid = false; 2711 2712 // Look every FieldDecl and IndirectFieldDecl with a name. 2713 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2714 DEnd = AnonRecord->decls_end(); 2715 D != DEnd; ++D) { 2716 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2717 cast<NamedDecl>(*D)->getDeclName()) { 2718 ValueDecl *VD = cast<ValueDecl>(*D); 2719 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2720 VD->getLocation(), diagKind)) { 2721 // C++ [class.union]p2: 2722 // The names of the members of an anonymous union shall be 2723 // distinct from the names of any other entity in the 2724 // scope in which the anonymous union is declared. 2725 Invalid = true; 2726 } else { 2727 // C++ [class.union]p2: 2728 // For the purpose of name lookup, after the anonymous union 2729 // definition, the members of the anonymous union are 2730 // considered to have been defined in the scope in which the 2731 // anonymous union is declared. 2732 unsigned OldChainingSize = Chaining.size(); 2733 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2734 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2735 PE = IF->chain_end(); PI != PE; ++PI) 2736 Chaining.push_back(*PI); 2737 else 2738 Chaining.push_back(VD); 2739 2740 assert(Chaining.size() >= 2); 2741 NamedDecl **NamedChain = 2742 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2743 for (unsigned i = 0; i < Chaining.size(); i++) 2744 NamedChain[i] = Chaining[i]; 2745 2746 IndirectFieldDecl* IndirectField = 2747 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2748 VD->getIdentifier(), VD->getType(), 2749 NamedChain, Chaining.size()); 2750 2751 IndirectField->setAccess(AS); 2752 IndirectField->setImplicit(); 2753 SemaRef.PushOnScopeChains(IndirectField, S); 2754 2755 // That includes picking up the appropriate access specifier. 2756 if (AS != AS_none) IndirectField->setAccess(AS); 2757 2758 Chaining.resize(OldChainingSize); 2759 } 2760 } 2761 } 2762 2763 return Invalid; 2764} 2765 2766/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2767/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2768/// illegal input values are mapped to SC_None. 2769static StorageClass 2770StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2771 switch (StorageClassSpec) { 2772 case DeclSpec::SCS_unspecified: return SC_None; 2773 case DeclSpec::SCS_extern: return SC_Extern; 2774 case DeclSpec::SCS_static: return SC_Static; 2775 case DeclSpec::SCS_auto: return SC_Auto; 2776 case DeclSpec::SCS_register: return SC_Register; 2777 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2778 // Illegal SCSs map to None: error reporting is up to the caller. 2779 case DeclSpec::SCS_mutable: // Fall through. 2780 case DeclSpec::SCS_typedef: return SC_None; 2781 } 2782 llvm_unreachable("unknown storage class specifier"); 2783} 2784 2785/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2786/// a StorageClass. Any error reporting is up to the caller: 2787/// illegal input values are mapped to SC_None. 2788static StorageClass 2789StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2790 switch (StorageClassSpec) { 2791 case DeclSpec::SCS_unspecified: return SC_None; 2792 case DeclSpec::SCS_extern: return SC_Extern; 2793 case DeclSpec::SCS_static: return SC_Static; 2794 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2795 // Illegal SCSs map to None: error reporting is up to the caller. 2796 case DeclSpec::SCS_auto: // Fall through. 2797 case DeclSpec::SCS_mutable: // Fall through. 2798 case DeclSpec::SCS_register: // Fall through. 2799 case DeclSpec::SCS_typedef: return SC_None; 2800 } 2801 llvm_unreachable("unknown storage class specifier"); 2802} 2803 2804/// BuildAnonymousStructOrUnion - Handle the declaration of an 2805/// anonymous structure or union. Anonymous unions are a C++ feature 2806/// (C++ [class.union]) and a C11 feature; anonymous structures 2807/// are a C11 feature and GNU C++ extension. 2808Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2809 AccessSpecifier AS, 2810 RecordDecl *Record) { 2811 DeclContext *Owner = Record->getDeclContext(); 2812 2813 // Diagnose whether this anonymous struct/union is an extension. 2814 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11) 2815 Diag(Record->getLocation(), diag::ext_anonymous_union); 2816 else if (!Record->isUnion() && getLangOpts().CPlusPlus) 2817 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2818 else if (!Record->isUnion() && !getLangOpts().C11) 2819 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2820 2821 // C and C++ require different kinds of checks for anonymous 2822 // structs/unions. 2823 bool Invalid = false; 2824 if (getLangOpts().CPlusPlus) { 2825 const char* PrevSpec = 0; 2826 unsigned DiagID; 2827 if (Record->isUnion()) { 2828 // C++ [class.union]p6: 2829 // Anonymous unions declared in a named namespace or in the 2830 // global namespace shall be declared static. 2831 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2832 (isa<TranslationUnitDecl>(Owner) || 2833 (isa<NamespaceDecl>(Owner) && 2834 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2835 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2836 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2837 2838 // Recover by adding 'static'. 2839 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2840 PrevSpec, DiagID); 2841 } 2842 // C++ [class.union]p6: 2843 // A storage class is not allowed in a declaration of an 2844 // anonymous union in a class scope. 2845 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2846 isa<RecordDecl>(Owner)) { 2847 Diag(DS.getStorageClassSpecLoc(), 2848 diag::err_anonymous_union_with_storage_spec) 2849 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2850 2851 // Recover by removing the storage specifier. 2852 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2853 SourceLocation(), 2854 PrevSpec, DiagID); 2855 } 2856 } 2857 2858 // Ignore const/volatile/restrict qualifiers. 2859 if (DS.getTypeQualifiers()) { 2860 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2861 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2862 << Record->isUnion() << 0 2863 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2864 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2865 Diag(DS.getVolatileSpecLoc(), 2866 diag::ext_anonymous_struct_union_qualified) 2867 << Record->isUnion() << 1 2868 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2869 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2870 Diag(DS.getRestrictSpecLoc(), 2871 diag::ext_anonymous_struct_union_qualified) 2872 << Record->isUnion() << 2 2873 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2874 2875 DS.ClearTypeQualifiers(); 2876 } 2877 2878 // C++ [class.union]p2: 2879 // The member-specification of an anonymous union shall only 2880 // define non-static data members. [Note: nested types and 2881 // functions cannot be declared within an anonymous union. ] 2882 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2883 MemEnd = Record->decls_end(); 2884 Mem != MemEnd; ++Mem) { 2885 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2886 // C++ [class.union]p3: 2887 // An anonymous union shall not have private or protected 2888 // members (clause 11). 2889 assert(FD->getAccess() != AS_none); 2890 if (FD->getAccess() != AS_public) { 2891 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2892 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2893 Invalid = true; 2894 } 2895 2896 // C++ [class.union]p1 2897 // An object of a class with a non-trivial constructor, a non-trivial 2898 // copy constructor, a non-trivial destructor, or a non-trivial copy 2899 // assignment operator cannot be a member of a union, nor can an 2900 // array of such objects. 2901 if (CheckNontrivialField(FD)) 2902 Invalid = true; 2903 } else if ((*Mem)->isImplicit()) { 2904 // Any implicit members are fine. 2905 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2906 // This is a type that showed up in an 2907 // elaborated-type-specifier inside the anonymous struct or 2908 // union, but which actually declares a type outside of the 2909 // anonymous struct or union. It's okay. 2910 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2911 if (!MemRecord->isAnonymousStructOrUnion() && 2912 MemRecord->getDeclName()) { 2913 // Visual C++ allows type definition in anonymous struct or union. 2914 if (getLangOpts().MicrosoftExt) 2915 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2916 << (int)Record->isUnion(); 2917 else { 2918 // This is a nested type declaration. 2919 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2920 << (int)Record->isUnion(); 2921 Invalid = true; 2922 } 2923 } 2924 } else if (isa<AccessSpecDecl>(*Mem)) { 2925 // Any access specifier is fine. 2926 } else { 2927 // We have something that isn't a non-static data 2928 // member. Complain about it. 2929 unsigned DK = diag::err_anonymous_record_bad_member; 2930 if (isa<TypeDecl>(*Mem)) 2931 DK = diag::err_anonymous_record_with_type; 2932 else if (isa<FunctionDecl>(*Mem)) 2933 DK = diag::err_anonymous_record_with_function; 2934 else if (isa<VarDecl>(*Mem)) 2935 DK = diag::err_anonymous_record_with_static; 2936 2937 // Visual C++ allows type definition in anonymous struct or union. 2938 if (getLangOpts().MicrosoftExt && 2939 DK == diag::err_anonymous_record_with_type) 2940 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2941 << (int)Record->isUnion(); 2942 else { 2943 Diag((*Mem)->getLocation(), DK) 2944 << (int)Record->isUnion(); 2945 Invalid = true; 2946 } 2947 } 2948 } 2949 } 2950 2951 if (!Record->isUnion() && !Owner->isRecord()) { 2952 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2953 << (int)getLangOpts().CPlusPlus; 2954 Invalid = true; 2955 } 2956 2957 // Mock up a declarator. 2958 Declarator Dc(DS, Declarator::MemberContext); 2959 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2960 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2961 2962 // Create a declaration for this anonymous struct/union. 2963 NamedDecl *Anon = 0; 2964 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2965 Anon = FieldDecl::Create(Context, OwningClass, 2966 DS.getLocStart(), 2967 Record->getLocation(), 2968 /*IdentifierInfo=*/0, 2969 Context.getTypeDeclType(Record), 2970 TInfo, 2971 /*BitWidth=*/0, /*Mutable=*/false, 2972 /*HasInit=*/false); 2973 Anon->setAccess(AS); 2974 if (getLangOpts().CPlusPlus) 2975 FieldCollector->Add(cast<FieldDecl>(Anon)); 2976 } else { 2977 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2978 assert(SCSpec != DeclSpec::SCS_typedef && 2979 "Parser allowed 'typedef' as storage class VarDecl."); 2980 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2981 if (SCSpec == DeclSpec::SCS_mutable) { 2982 // mutable can only appear on non-static class members, so it's always 2983 // an error here 2984 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2985 Invalid = true; 2986 SC = SC_None; 2987 } 2988 SCSpec = DS.getStorageClassSpecAsWritten(); 2989 VarDecl::StorageClass SCAsWritten 2990 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2991 2992 Anon = VarDecl::Create(Context, Owner, 2993 DS.getLocStart(), 2994 Record->getLocation(), /*IdentifierInfo=*/0, 2995 Context.getTypeDeclType(Record), 2996 TInfo, SC, SCAsWritten); 2997 2998 // Default-initialize the implicit variable. This initialization will be 2999 // trivial in almost all cases, except if a union member has an in-class 3000 // initializer: 3001 // union { int n = 0; }; 3002 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 3003 } 3004 Anon->setImplicit(); 3005 3006 // Add the anonymous struct/union object to the current 3007 // context. We'll be referencing this object when we refer to one of 3008 // its members. 3009 Owner->addDecl(Anon); 3010 3011 // Inject the members of the anonymous struct/union into the owning 3012 // context and into the identifier resolver chain for name lookup 3013 // purposes. 3014 SmallVector<NamedDecl*, 2> Chain; 3015 Chain.push_back(Anon); 3016 3017 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 3018 Chain, false)) 3019 Invalid = true; 3020 3021 // Mark this as an anonymous struct/union type. Note that we do not 3022 // do this until after we have already checked and injected the 3023 // members of this anonymous struct/union type, because otherwise 3024 // the members could be injected twice: once by DeclContext when it 3025 // builds its lookup table, and once by 3026 // InjectAnonymousStructOrUnionMembers. 3027 Record->setAnonymousStructOrUnion(true); 3028 3029 if (Invalid) 3030 Anon->setInvalidDecl(); 3031 3032 return Anon; 3033} 3034 3035/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 3036/// Microsoft C anonymous structure. 3037/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 3038/// Example: 3039/// 3040/// struct A { int a; }; 3041/// struct B { struct A; int b; }; 3042/// 3043/// void foo() { 3044/// B var; 3045/// var.a = 3; 3046/// } 3047/// 3048Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 3049 RecordDecl *Record) { 3050 3051 // If there is no Record, get the record via the typedef. 3052 if (!Record) 3053 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 3054 3055 // Mock up a declarator. 3056 Declarator Dc(DS, Declarator::TypeNameContext); 3057 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 3058 assert(TInfo && "couldn't build declarator info for anonymous struct"); 3059 3060 // Create a declaration for this anonymous struct. 3061 NamedDecl* Anon = FieldDecl::Create(Context, 3062 cast<RecordDecl>(CurContext), 3063 DS.getLocStart(), 3064 DS.getLocStart(), 3065 /*IdentifierInfo=*/0, 3066 Context.getTypeDeclType(Record), 3067 TInfo, 3068 /*BitWidth=*/0, /*Mutable=*/false, 3069 /*HasInit=*/false); 3070 Anon->setImplicit(); 3071 3072 // Add the anonymous struct object to the current context. 3073 CurContext->addDecl(Anon); 3074 3075 // Inject the members of the anonymous struct into the current 3076 // context and into the identifier resolver chain for name lookup 3077 // purposes. 3078 SmallVector<NamedDecl*, 2> Chain; 3079 Chain.push_back(Anon); 3080 3081 RecordDecl *RecordDef = Record->getDefinition(); 3082 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 3083 RecordDef, AS_none, 3084 Chain, true)) 3085 Anon->setInvalidDecl(); 3086 3087 return Anon; 3088} 3089 3090/// GetNameForDeclarator - Determine the full declaration name for the 3091/// given Declarator. 3092DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 3093 return GetNameFromUnqualifiedId(D.getName()); 3094} 3095 3096/// \brief Retrieves the declaration name from a parsed unqualified-id. 3097DeclarationNameInfo 3098Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 3099 DeclarationNameInfo NameInfo; 3100 NameInfo.setLoc(Name.StartLocation); 3101 3102 switch (Name.getKind()) { 3103 3104 case UnqualifiedId::IK_ImplicitSelfParam: 3105 case UnqualifiedId::IK_Identifier: 3106 NameInfo.setName(Name.Identifier); 3107 NameInfo.setLoc(Name.StartLocation); 3108 return NameInfo; 3109 3110 case UnqualifiedId::IK_OperatorFunctionId: 3111 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 3112 Name.OperatorFunctionId.Operator)); 3113 NameInfo.setLoc(Name.StartLocation); 3114 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 3115 = Name.OperatorFunctionId.SymbolLocations[0]; 3116 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 3117 = Name.EndLocation.getRawEncoding(); 3118 return NameInfo; 3119 3120 case UnqualifiedId::IK_LiteralOperatorId: 3121 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 3122 Name.Identifier)); 3123 NameInfo.setLoc(Name.StartLocation); 3124 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3125 return NameInfo; 3126 3127 case UnqualifiedId::IK_ConversionFunctionId: { 3128 TypeSourceInfo *TInfo; 3129 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3130 if (Ty.isNull()) 3131 return DeclarationNameInfo(); 3132 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3133 Context.getCanonicalType(Ty))); 3134 NameInfo.setLoc(Name.StartLocation); 3135 NameInfo.setNamedTypeInfo(TInfo); 3136 return NameInfo; 3137 } 3138 3139 case UnqualifiedId::IK_ConstructorName: { 3140 TypeSourceInfo *TInfo; 3141 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3142 if (Ty.isNull()) 3143 return DeclarationNameInfo(); 3144 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3145 Context.getCanonicalType(Ty))); 3146 NameInfo.setLoc(Name.StartLocation); 3147 NameInfo.setNamedTypeInfo(TInfo); 3148 return NameInfo; 3149 } 3150 3151 case UnqualifiedId::IK_ConstructorTemplateId: { 3152 // In well-formed code, we can only have a constructor 3153 // template-id that refers to the current context, so go there 3154 // to find the actual type being constructed. 3155 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3156 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3157 return DeclarationNameInfo(); 3158 3159 // Determine the type of the class being constructed. 3160 QualType CurClassType = Context.getTypeDeclType(CurClass); 3161 3162 // FIXME: Check two things: that the template-id names the same type as 3163 // CurClassType, and that the template-id does not occur when the name 3164 // was qualified. 3165 3166 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3167 Context.getCanonicalType(CurClassType))); 3168 NameInfo.setLoc(Name.StartLocation); 3169 // FIXME: should we retrieve TypeSourceInfo? 3170 NameInfo.setNamedTypeInfo(0); 3171 return NameInfo; 3172 } 3173 3174 case UnqualifiedId::IK_DestructorName: { 3175 TypeSourceInfo *TInfo; 3176 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3177 if (Ty.isNull()) 3178 return DeclarationNameInfo(); 3179 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3180 Context.getCanonicalType(Ty))); 3181 NameInfo.setLoc(Name.StartLocation); 3182 NameInfo.setNamedTypeInfo(TInfo); 3183 return NameInfo; 3184 } 3185 3186 case UnqualifiedId::IK_TemplateId: { 3187 TemplateName TName = Name.TemplateId->Template.get(); 3188 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3189 return Context.getNameForTemplate(TName, TNameLoc); 3190 } 3191 3192 } // switch (Name.getKind()) 3193 3194 llvm_unreachable("Unknown name kind"); 3195} 3196 3197static QualType getCoreType(QualType Ty) { 3198 do { 3199 if (Ty->isPointerType() || Ty->isReferenceType()) 3200 Ty = Ty->getPointeeType(); 3201 else if (Ty->isArrayType()) 3202 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3203 else 3204 return Ty.withoutLocalFastQualifiers(); 3205 } while (true); 3206} 3207 3208/// hasSimilarParameters - Determine whether the C++ functions Declaration 3209/// and Definition have "nearly" matching parameters. This heuristic is 3210/// used to improve diagnostics in the case where an out-of-line function 3211/// definition doesn't match any declaration within the class or namespace. 3212/// Also sets Params to the list of indices to the parameters that differ 3213/// between the declaration and the definition. If hasSimilarParameters 3214/// returns true and Params is empty, then all of the parameters match. 3215static bool hasSimilarParameters(ASTContext &Context, 3216 FunctionDecl *Declaration, 3217 FunctionDecl *Definition, 3218 llvm::SmallVectorImpl<unsigned> &Params) { 3219 Params.clear(); 3220 if (Declaration->param_size() != Definition->param_size()) 3221 return false; 3222 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3223 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3224 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3225 3226 // The parameter types are identical 3227 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3228 continue; 3229 3230 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3231 QualType DefParamBaseTy = getCoreType(DefParamTy); 3232 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3233 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3234 3235 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3236 (DeclTyName && DeclTyName == DefTyName)) 3237 Params.push_back(Idx); 3238 else // The two parameters aren't even close 3239 return false; 3240 } 3241 3242 return true; 3243} 3244 3245/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3246/// declarator needs to be rebuilt in the current instantiation. 3247/// Any bits of declarator which appear before the name are valid for 3248/// consideration here. That's specifically the type in the decl spec 3249/// and the base type in any member-pointer chunks. 3250static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3251 DeclarationName Name) { 3252 // The types we specifically need to rebuild are: 3253 // - typenames, typeofs, and decltypes 3254 // - types which will become injected class names 3255 // Of course, we also need to rebuild any type referencing such a 3256 // type. It's safest to just say "dependent", but we call out a 3257 // few cases here. 3258 3259 DeclSpec &DS = D.getMutableDeclSpec(); 3260 switch (DS.getTypeSpecType()) { 3261 case DeclSpec::TST_typename: 3262 case DeclSpec::TST_typeofType: 3263 case DeclSpec::TST_decltype: 3264 case DeclSpec::TST_underlyingType: 3265 case DeclSpec::TST_atomic: { 3266 // Grab the type from the parser. 3267 TypeSourceInfo *TSI = 0; 3268 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3269 if (T.isNull() || !T->isDependentType()) break; 3270 3271 // Make sure there's a type source info. This isn't really much 3272 // of a waste; most dependent types should have type source info 3273 // attached already. 3274 if (!TSI) 3275 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3276 3277 // Rebuild the type in the current instantiation. 3278 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3279 if (!TSI) return true; 3280 3281 // Store the new type back in the decl spec. 3282 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3283 DS.UpdateTypeRep(LocType); 3284 break; 3285 } 3286 3287 case DeclSpec::TST_typeofExpr: { 3288 Expr *E = DS.getRepAsExpr(); 3289 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3290 if (Result.isInvalid()) return true; 3291 DS.UpdateExprRep(Result.get()); 3292 break; 3293 } 3294 3295 default: 3296 // Nothing to do for these decl specs. 3297 break; 3298 } 3299 3300 // It doesn't matter what order we do this in. 3301 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3302 DeclaratorChunk &Chunk = D.getTypeObject(I); 3303 3304 // The only type information in the declarator which can come 3305 // before the declaration name is the base type of a member 3306 // pointer. 3307 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3308 continue; 3309 3310 // Rebuild the scope specifier in-place. 3311 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3312 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3313 return true; 3314 } 3315 3316 return false; 3317} 3318 3319Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3320 D.setFunctionDefinitionKind(FDK_Declaration); 3321 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3322 3323 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3324 Dcl && Dcl->getDeclContext()->isFileContext()) 3325 Dcl->setTopLevelDeclInObjCContainer(); 3326 3327 return Dcl; 3328} 3329 3330/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3331/// If T is the name of a class, then each of the following shall have a 3332/// name different from T: 3333/// - every static data member of class T; 3334/// - every member function of class T 3335/// - every member of class T that is itself a type; 3336/// \returns true if the declaration name violates these rules. 3337bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3338 DeclarationNameInfo NameInfo) { 3339 DeclarationName Name = NameInfo.getName(); 3340 3341 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3342 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3343 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3344 return true; 3345 } 3346 3347 return false; 3348} 3349 3350/// \brief Diagnose a declaration whose declarator-id has the given 3351/// nested-name-specifier. 3352/// 3353/// \param SS The nested-name-specifier of the declarator-id. 3354/// 3355/// \param DC The declaration context to which the nested-name-specifier 3356/// resolves. 3357/// 3358/// \param Name The name of the entity being declared. 3359/// 3360/// \param Loc The location of the name of the entity being declared. 3361/// 3362/// \returns true if we cannot safely recover from this error, false otherwise. 3363bool Sema::diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC, 3364 DeclarationName Name, 3365 SourceLocation Loc) { 3366 DeclContext *Cur = CurContext; 3367 while (isa<LinkageSpecDecl>(Cur)) 3368 Cur = Cur->getParent(); 3369 3370 // C++ [dcl.meaning]p1: 3371 // A declarator-id shall not be qualified except for the definition 3372 // of a member function (9.3) or static data member (9.4) outside of 3373 // its class, the definition or explicit instantiation of a function 3374 // or variable member of a namespace outside of its namespace, or the 3375 // definition of an explicit specialization outside of its namespace, 3376 // or the declaration of a friend function that is a member of 3377 // another class or namespace (11.3). [...] 3378 3379 // The user provided a superfluous scope specifier that refers back to the 3380 // class or namespaces in which the entity is already declared. 3381 // 3382 // class X { 3383 // void X::f(); 3384 // }; 3385 if (Cur->Equals(DC)) { 3386 Diag(Loc, diag::warn_member_extra_qualification) 3387 << Name << FixItHint::CreateRemoval(SS.getRange()); 3388 SS.clear(); 3389 return false; 3390 } 3391 3392 // Check whether the qualifying scope encloses the scope of the original 3393 // declaration. 3394 if (!Cur->Encloses(DC)) { 3395 if (Cur->isRecord()) 3396 Diag(Loc, diag::err_member_qualification) 3397 << Name << SS.getRange(); 3398 else if (isa<TranslationUnitDecl>(DC)) 3399 Diag(Loc, diag::err_invalid_declarator_global_scope) 3400 << Name << SS.getRange(); 3401 else if (isa<FunctionDecl>(Cur)) 3402 Diag(Loc, diag::err_invalid_declarator_in_function) 3403 << Name << SS.getRange(); 3404 else 3405 Diag(Loc, diag::err_invalid_declarator_scope) 3406 << Name << cast<NamedDecl>(Cur) << cast<NamedDecl>(DC) << SS.getRange(); 3407 3408 return true; 3409 } 3410 3411 if (Cur->isRecord()) { 3412 // Cannot qualify members within a class. 3413 Diag(Loc, diag::err_member_qualification) 3414 << Name << SS.getRange(); 3415 SS.clear(); 3416 3417 // C++ constructors and destructors with incorrect scopes can break 3418 // our AST invariants by having the wrong underlying types. If 3419 // that's the case, then drop this declaration entirely. 3420 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3421 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3422 !Context.hasSameType(Name.getCXXNameType(), 3423 Context.getTypeDeclType(cast<CXXRecordDecl>(Cur)))) 3424 return true; 3425 3426 return false; 3427 } 3428 3429 // C++11 [dcl.meaning]p1: 3430 // [...] "The nested-name-specifier of the qualified declarator-id shall 3431 // not begin with a decltype-specifer" 3432 NestedNameSpecifierLoc SpecLoc(SS.getScopeRep(), SS.location_data()); 3433 while (SpecLoc.getPrefix()) 3434 SpecLoc = SpecLoc.getPrefix(); 3435 if (dyn_cast_or_null<DecltypeType>( 3436 SpecLoc.getNestedNameSpecifier()->getAsType())) 3437 Diag(Loc, diag::err_decltype_in_declarator) 3438 << SpecLoc.getTypeLoc().getSourceRange(); 3439 3440 return false; 3441} 3442 3443Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3444 MultiTemplateParamsArg TemplateParamLists) { 3445 // TODO: consider using NameInfo for diagnostic. 3446 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3447 DeclarationName Name = NameInfo.getName(); 3448 3449 // All of these full declarators require an identifier. If it doesn't have 3450 // one, the ParsedFreeStandingDeclSpec action should be used. 3451 if (!Name) { 3452 if (!D.isInvalidType()) // Reject this if we think it is valid. 3453 Diag(D.getDeclSpec().getLocStart(), 3454 diag::err_declarator_need_ident) 3455 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3456 return 0; 3457 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3458 return 0; 3459 3460 // The scope passed in may not be a decl scope. Zip up the scope tree until 3461 // we find one that is. 3462 while ((S->getFlags() & Scope::DeclScope) == 0 || 3463 (S->getFlags() & Scope::TemplateParamScope) != 0) 3464 S = S->getParent(); 3465 3466 DeclContext *DC = CurContext; 3467 if (D.getCXXScopeSpec().isInvalid()) 3468 D.setInvalidType(); 3469 else if (D.getCXXScopeSpec().isSet()) { 3470 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3471 UPPC_DeclarationQualifier)) 3472 return 0; 3473 3474 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3475 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3476 if (!DC) { 3477 // If we could not compute the declaration context, it's because the 3478 // declaration context is dependent but does not refer to a class, 3479 // class template, or class template partial specialization. Complain 3480 // and return early, to avoid the coming semantic disaster. 3481 Diag(D.getIdentifierLoc(), 3482 diag::err_template_qualified_declarator_no_match) 3483 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3484 << D.getCXXScopeSpec().getRange(); 3485 return 0; 3486 } 3487 bool IsDependentContext = DC->isDependentContext(); 3488 3489 if (!IsDependentContext && 3490 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3491 return 0; 3492 3493 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 3494 Diag(D.getIdentifierLoc(), 3495 diag::err_member_def_undefined_record) 3496 << Name << DC << D.getCXXScopeSpec().getRange(); 3497 D.setInvalidType(); 3498 } else if (!D.getDeclSpec().isFriendSpecified()) { 3499 if (diagnoseQualifiedDeclaration(D.getCXXScopeSpec(), DC, 3500 Name, D.getIdentifierLoc())) { 3501 if (DC->isRecord()) 3502 return 0; 3503 3504 D.setInvalidType(); 3505 } 3506 } 3507 3508 // Check whether we need to rebuild the type of the given 3509 // declaration in the current instantiation. 3510 if (EnteringContext && IsDependentContext && 3511 TemplateParamLists.size() != 0) { 3512 ContextRAII SavedContext(*this, DC); 3513 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3514 D.setInvalidType(); 3515 } 3516 } 3517 3518 if (DiagnoseClassNameShadow(DC, NameInfo)) 3519 // If this is a typedef, we'll end up spewing multiple diagnostics. 3520 // Just return early; it's safer. 3521 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3522 return 0; 3523 3524 NamedDecl *New; 3525 3526 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3527 QualType R = TInfo->getType(); 3528 3529 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3530 UPPC_DeclarationType)) 3531 D.setInvalidType(); 3532 3533 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3534 ForRedeclaration); 3535 3536 // See if this is a redefinition of a variable in the same scope. 3537 if (!D.getCXXScopeSpec().isSet()) { 3538 bool IsLinkageLookup = false; 3539 3540 // If the declaration we're planning to build will be a function 3541 // or object with linkage, then look for another declaration with 3542 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3543 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3544 /* Do nothing*/; 3545 else if (R->isFunctionType()) { 3546 if (CurContext->isFunctionOrMethod() || 3547 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3548 IsLinkageLookup = true; 3549 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3550 IsLinkageLookup = true; 3551 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3552 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3553 IsLinkageLookup = true; 3554 3555 if (IsLinkageLookup) 3556 Previous.clear(LookupRedeclarationWithLinkage); 3557 3558 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3559 } else { // Something like "int foo::x;" 3560 LookupQualifiedName(Previous, DC); 3561 3562 // C++ [dcl.meaning]p1: 3563 // When the declarator-id is qualified, the declaration shall refer to a 3564 // previously declared member of the class or namespace to which the 3565 // qualifier refers (or, in the case of a namespace, of an element of the 3566 // inline namespace set of that namespace (7.3.1)) or to a specialization 3567 // thereof; [...] 3568 // 3569 // Note that we already checked the context above, and that we do not have 3570 // enough information to make sure that Previous contains the declaration 3571 // we want to match. For example, given: 3572 // 3573 // class X { 3574 // void f(); 3575 // void f(float); 3576 // }; 3577 // 3578 // void X::f(int) { } // ill-formed 3579 // 3580 // In this case, Previous will point to the overload set 3581 // containing the two f's declared in X, but neither of them 3582 // matches. 3583 3584 // C++ [dcl.meaning]p1: 3585 // [...] the member shall not merely have been introduced by a 3586 // using-declaration in the scope of the class or namespace nominated by 3587 // the nested-name-specifier of the declarator-id. 3588 RemoveUsingDecls(Previous); 3589 } 3590 3591 if (Previous.isSingleResult() && 3592 Previous.getFoundDecl()->isTemplateParameter()) { 3593 // Maybe we will complain about the shadowed template parameter. 3594 if (!D.isInvalidType()) 3595 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3596 Previous.getFoundDecl()); 3597 3598 // Just pretend that we didn't see the previous declaration. 3599 Previous.clear(); 3600 } 3601 3602 // In C++, the previous declaration we find might be a tag type 3603 // (class or enum). In this case, the new declaration will hide the 3604 // tag type. Note that this does does not apply if we're declaring a 3605 // typedef (C++ [dcl.typedef]p4). 3606 if (Previous.isSingleTagDecl() && 3607 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3608 Previous.clear(); 3609 3610 bool AddToScope = true; 3611 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3612 if (TemplateParamLists.size()) { 3613 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3614 return 0; 3615 } 3616 3617 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3618 } else if (R->isFunctionType()) { 3619 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3620 move(TemplateParamLists), 3621 AddToScope); 3622 } else { 3623 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3624 move(TemplateParamLists)); 3625 } 3626 3627 if (New == 0) 3628 return 0; 3629 3630 // If this has an identifier and is not an invalid redeclaration or 3631 // function template specialization, add it to the scope stack. 3632 if (New->getDeclName() && AddToScope && 3633 !(D.isRedeclaration() && New->isInvalidDecl())) 3634 PushOnScopeChains(New, S); 3635 3636 return New; 3637} 3638 3639/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3640/// types into constant array types in certain situations which would otherwise 3641/// be errors (for GCC compatibility). 3642static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3643 ASTContext &Context, 3644 bool &SizeIsNegative, 3645 llvm::APSInt &Oversized) { 3646 // This method tries to turn a variable array into a constant 3647 // array even when the size isn't an ICE. This is necessary 3648 // for compatibility with code that depends on gcc's buggy 3649 // constant expression folding, like struct {char x[(int)(char*)2];} 3650 SizeIsNegative = false; 3651 Oversized = 0; 3652 3653 if (T->isDependentType()) 3654 return QualType(); 3655 3656 QualifierCollector Qs; 3657 const Type *Ty = Qs.strip(T); 3658 3659 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3660 QualType Pointee = PTy->getPointeeType(); 3661 QualType FixedType = 3662 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3663 Oversized); 3664 if (FixedType.isNull()) return FixedType; 3665 FixedType = Context.getPointerType(FixedType); 3666 return Qs.apply(Context, FixedType); 3667 } 3668 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3669 QualType Inner = PTy->getInnerType(); 3670 QualType FixedType = 3671 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3672 Oversized); 3673 if (FixedType.isNull()) return FixedType; 3674 FixedType = Context.getParenType(FixedType); 3675 return Qs.apply(Context, FixedType); 3676 } 3677 3678 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3679 if (!VLATy) 3680 return QualType(); 3681 // FIXME: We should probably handle this case 3682 if (VLATy->getElementType()->isVariablyModifiedType()) 3683 return QualType(); 3684 3685 llvm::APSInt Res; 3686 if (!VLATy->getSizeExpr() || 3687 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3688 return QualType(); 3689 3690 // Check whether the array size is negative. 3691 if (Res.isSigned() && Res.isNegative()) { 3692 SizeIsNegative = true; 3693 return QualType(); 3694 } 3695 3696 // Check whether the array is too large to be addressed. 3697 unsigned ActiveSizeBits 3698 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3699 Res); 3700 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3701 Oversized = Res; 3702 return QualType(); 3703 } 3704 3705 return Context.getConstantArrayType(VLATy->getElementType(), 3706 Res, ArrayType::Normal, 0); 3707} 3708 3709/// \brief Register the given locally-scoped external C declaration so 3710/// that it can be found later for redeclarations 3711void 3712Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3713 const LookupResult &Previous, 3714 Scope *S) { 3715 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3716 "Decl is not a locally-scoped decl!"); 3717 // Note that we have a locally-scoped external with this name. 3718 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3719 3720 if (!Previous.isSingleResult()) 3721 return; 3722 3723 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3724 3725 // If there was a previous declaration of this variable, it may be 3726 // in our identifier chain. Update the identifier chain with the new 3727 // declaration. 3728 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3729 // The previous declaration was found on the identifer resolver 3730 // chain, so remove it from its scope. 3731 3732 if (S->isDeclScope(PrevDecl)) { 3733 // Special case for redeclarations in the SAME scope. 3734 // Because this declaration is going to be added to the identifier chain 3735 // later, we should temporarily take it OFF the chain. 3736 IdResolver.RemoveDecl(ND); 3737 3738 } else { 3739 // Find the scope for the original declaration. 3740 while (S && !S->isDeclScope(PrevDecl)) 3741 S = S->getParent(); 3742 } 3743 3744 if (S) 3745 S->RemoveDecl(PrevDecl); 3746 } 3747} 3748 3749llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3750Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3751 if (ExternalSource) { 3752 // Load locally-scoped external decls from the external source. 3753 SmallVector<NamedDecl *, 4> Decls; 3754 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3755 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3756 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3757 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3758 if (Pos == LocallyScopedExternalDecls.end()) 3759 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3760 } 3761 } 3762 3763 return LocallyScopedExternalDecls.find(Name); 3764} 3765 3766/// \brief Diagnose function specifiers on a declaration of an identifier that 3767/// does not identify a function. 3768void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3769 // FIXME: We should probably indicate the identifier in question to avoid 3770 // confusion for constructs like "inline int a(), b;" 3771 if (D.getDeclSpec().isInlineSpecified()) 3772 Diag(D.getDeclSpec().getInlineSpecLoc(), 3773 diag::err_inline_non_function); 3774 3775 if (D.getDeclSpec().isVirtualSpecified()) 3776 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3777 diag::err_virtual_non_function); 3778 3779 if (D.getDeclSpec().isExplicitSpecified()) 3780 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3781 diag::err_explicit_non_function); 3782} 3783 3784NamedDecl* 3785Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3786 TypeSourceInfo *TInfo, LookupResult &Previous) { 3787 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3788 if (D.getCXXScopeSpec().isSet()) { 3789 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3790 << D.getCXXScopeSpec().getRange(); 3791 D.setInvalidType(); 3792 // Pretend we didn't see the scope specifier. 3793 DC = CurContext; 3794 Previous.clear(); 3795 } 3796 3797 if (getLangOpts().CPlusPlus) { 3798 // Check that there are no default arguments (C++ only). 3799 CheckExtraCXXDefaultArguments(D); 3800 } 3801 3802 DiagnoseFunctionSpecifiers(D); 3803 3804 if (D.getDeclSpec().isThreadSpecified()) 3805 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3806 if (D.getDeclSpec().isConstexprSpecified()) 3807 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3808 << 1; 3809 3810 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3811 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3812 << D.getName().getSourceRange(); 3813 return 0; 3814 } 3815 3816 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3817 if (!NewTD) return 0; 3818 3819 // Handle attributes prior to checking for duplicates in MergeVarDecl 3820 ProcessDeclAttributes(S, NewTD, D); 3821 3822 CheckTypedefForVariablyModifiedType(S, NewTD); 3823 3824 bool Redeclaration = D.isRedeclaration(); 3825 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3826 D.setRedeclaration(Redeclaration); 3827 return ND; 3828} 3829 3830void 3831Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3832 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3833 // then it shall have block scope. 3834 // Note that variably modified types must be fixed before merging the decl so 3835 // that redeclarations will match. 3836 QualType T = NewTD->getUnderlyingType(); 3837 if (T->isVariablyModifiedType()) { 3838 getCurFunction()->setHasBranchProtectedScope(); 3839 3840 if (S->getFnParent() == 0) { 3841 bool SizeIsNegative; 3842 llvm::APSInt Oversized; 3843 QualType FixedTy = 3844 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3845 Oversized); 3846 if (!FixedTy.isNull()) { 3847 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3848 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3849 } else { 3850 if (SizeIsNegative) 3851 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3852 else if (T->isVariableArrayType()) 3853 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3854 else if (Oversized.getBoolValue()) 3855 Diag(NewTD->getLocation(), diag::err_array_too_large) 3856 << Oversized.toString(10); 3857 else 3858 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3859 NewTD->setInvalidDecl(); 3860 } 3861 } 3862 } 3863} 3864 3865 3866/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3867/// declares a typedef-name, either using the 'typedef' type specifier or via 3868/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3869NamedDecl* 3870Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3871 LookupResult &Previous, bool &Redeclaration) { 3872 // Merge the decl with the existing one if appropriate. If the decl is 3873 // in an outer scope, it isn't the same thing. 3874 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3875 /*ExplicitInstantiationOrSpecialization=*/false); 3876 if (!Previous.empty()) { 3877 Redeclaration = true; 3878 MergeTypedefNameDecl(NewTD, Previous); 3879 } 3880 3881 // If this is the C FILE type, notify the AST context. 3882 if (IdentifierInfo *II = NewTD->getIdentifier()) 3883 if (!NewTD->isInvalidDecl() && 3884 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3885 if (II->isStr("FILE")) 3886 Context.setFILEDecl(NewTD); 3887 else if (II->isStr("jmp_buf")) 3888 Context.setjmp_bufDecl(NewTD); 3889 else if (II->isStr("sigjmp_buf")) 3890 Context.setsigjmp_bufDecl(NewTD); 3891 else if (II->isStr("ucontext_t")) 3892 Context.setucontext_tDecl(NewTD); 3893 else if (II->isStr("__builtin_va_list")) 3894 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3895 } 3896 3897 return NewTD; 3898} 3899 3900/// \brief Determines whether the given declaration is an out-of-scope 3901/// previous declaration. 3902/// 3903/// This routine should be invoked when name lookup has found a 3904/// previous declaration (PrevDecl) that is not in the scope where a 3905/// new declaration by the same name is being introduced. If the new 3906/// declaration occurs in a local scope, previous declarations with 3907/// linkage may still be considered previous declarations (C99 3908/// 6.2.2p4-5, C++ [basic.link]p6). 3909/// 3910/// \param PrevDecl the previous declaration found by name 3911/// lookup 3912/// 3913/// \param DC the context in which the new declaration is being 3914/// declared. 3915/// 3916/// \returns true if PrevDecl is an out-of-scope previous declaration 3917/// for a new delcaration with the same name. 3918static bool 3919isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3920 ASTContext &Context) { 3921 if (!PrevDecl) 3922 return false; 3923 3924 if (!PrevDecl->hasLinkage()) 3925 return false; 3926 3927 if (Context.getLangOpts().CPlusPlus) { 3928 // C++ [basic.link]p6: 3929 // If there is a visible declaration of an entity with linkage 3930 // having the same name and type, ignoring entities declared 3931 // outside the innermost enclosing namespace scope, the block 3932 // scope declaration declares that same entity and receives the 3933 // linkage of the previous declaration. 3934 DeclContext *OuterContext = DC->getRedeclContext(); 3935 if (!OuterContext->isFunctionOrMethod()) 3936 // This rule only applies to block-scope declarations. 3937 return false; 3938 3939 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3940 if (PrevOuterContext->isRecord()) 3941 // We found a member function: ignore it. 3942 return false; 3943 3944 // Find the innermost enclosing namespace for the new and 3945 // previous declarations. 3946 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3947 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3948 3949 // The previous declaration is in a different namespace, so it 3950 // isn't the same function. 3951 if (!OuterContext->Equals(PrevOuterContext)) 3952 return false; 3953 } 3954 3955 return true; 3956} 3957 3958static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3959 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3960 if (!SS.isSet()) return; 3961 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3962} 3963 3964bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3965 QualType type = decl->getType(); 3966 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3967 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3968 // Various kinds of declaration aren't allowed to be __autoreleasing. 3969 unsigned kind = -1U; 3970 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3971 if (var->hasAttr<BlocksAttr>()) 3972 kind = 0; // __block 3973 else if (!var->hasLocalStorage()) 3974 kind = 1; // global 3975 } else if (isa<ObjCIvarDecl>(decl)) { 3976 kind = 3; // ivar 3977 } else if (isa<FieldDecl>(decl)) { 3978 kind = 2; // field 3979 } 3980 3981 if (kind != -1U) { 3982 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3983 << kind; 3984 } 3985 } else if (lifetime == Qualifiers::OCL_None) { 3986 // Try to infer lifetime. 3987 if (!type->isObjCLifetimeType()) 3988 return false; 3989 3990 lifetime = type->getObjCARCImplicitLifetime(); 3991 type = Context.getLifetimeQualifiedType(type, lifetime); 3992 decl->setType(type); 3993 } 3994 3995 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3996 // Thread-local variables cannot have lifetime. 3997 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3998 var->isThreadSpecified()) { 3999 Diag(var->getLocation(), diag::err_arc_thread_ownership) 4000 << var->getType(); 4001 return true; 4002 } 4003 } 4004 4005 return false; 4006} 4007 4008NamedDecl* 4009Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4010 TypeSourceInfo *TInfo, LookupResult &Previous, 4011 MultiTemplateParamsArg TemplateParamLists) { 4012 QualType R = TInfo->getType(); 4013 DeclarationName Name = GetNameForDeclarator(D).getName(); 4014 4015 // Check that there are no default arguments (C++ only). 4016 if (getLangOpts().CPlusPlus) 4017 CheckExtraCXXDefaultArguments(D); 4018 4019 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 4020 assert(SCSpec != DeclSpec::SCS_typedef && 4021 "Parser allowed 'typedef' as storage class VarDecl."); 4022 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 4023 if (SCSpec == DeclSpec::SCS_mutable) { 4024 // mutable can only appear on non-static class members, so it's always 4025 // an error here 4026 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 4027 D.setInvalidType(); 4028 SC = SC_None; 4029 } 4030 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4031 VarDecl::StorageClass SCAsWritten 4032 = StorageClassSpecToVarDeclStorageClass(SCSpec); 4033 4034 IdentifierInfo *II = Name.getAsIdentifierInfo(); 4035 if (!II) { 4036 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 4037 << Name; 4038 return 0; 4039 } 4040 4041 DiagnoseFunctionSpecifiers(D); 4042 4043 if (!DC->isRecord() && S->getFnParent() == 0) { 4044 // C99 6.9p2: The storage-class specifiers auto and register shall not 4045 // appear in the declaration specifiers in an external declaration. 4046 if (SC == SC_Auto || SC == SC_Register) { 4047 4048 // If this is a register variable with an asm label specified, then this 4049 // is a GNU extension. 4050 if (SC == SC_Register && D.getAsmLabel()) 4051 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 4052 else 4053 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 4054 D.setInvalidType(); 4055 } 4056 } 4057 4058 if (getLangOpts().OpenCL) { 4059 // Set up the special work-group-local storage class for variables in the 4060 // OpenCL __local address space. 4061 if (R.getAddressSpace() == LangAS::opencl_local) 4062 SC = SC_OpenCLWorkGroupLocal; 4063 } 4064 4065 bool isExplicitSpecialization = false; 4066 VarDecl *NewVD; 4067 if (!getLangOpts().CPlusPlus) { 4068 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4069 D.getIdentifierLoc(), II, 4070 R, TInfo, SC, SCAsWritten); 4071 4072 if (D.isInvalidType()) 4073 NewVD->setInvalidDecl(); 4074 } else { 4075 if (DC->isRecord() && !CurContext->isRecord()) { 4076 // This is an out-of-line definition of a static data member. 4077 if (SC == SC_Static) { 4078 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4079 diag::err_static_out_of_line) 4080 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4081 } else if (SC == SC_None) 4082 SC = SC_Static; 4083 } 4084 if (SC == SC_Static && CurContext->isRecord()) { 4085 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 4086 if (RD->isLocalClass()) 4087 Diag(D.getIdentifierLoc(), 4088 diag::err_static_data_member_not_allowed_in_local_class) 4089 << Name << RD->getDeclName(); 4090 4091 // C++98 [class.union]p1: If a union contains a static data member, 4092 // the program is ill-formed. C++11 drops this restriction. 4093 if (RD->isUnion()) 4094 Diag(D.getIdentifierLoc(), 4095 getLangOpts().CPlusPlus0x 4096 ? diag::warn_cxx98_compat_static_data_member_in_union 4097 : diag::ext_static_data_member_in_union) << Name; 4098 // We conservatively disallow static data members in anonymous structs. 4099 else if (!RD->getDeclName()) 4100 Diag(D.getIdentifierLoc(), 4101 diag::err_static_data_member_not_allowed_in_anon_struct) 4102 << Name << RD->isUnion(); 4103 } 4104 } 4105 4106 // Match up the template parameter lists with the scope specifier, then 4107 // determine whether we have a template or a template specialization. 4108 isExplicitSpecialization = false; 4109 bool Invalid = false; 4110 if (TemplateParameterList *TemplateParams 4111 = MatchTemplateParametersToScopeSpecifier( 4112 D.getDeclSpec().getLocStart(), 4113 D.getIdentifierLoc(), 4114 D.getCXXScopeSpec(), 4115 TemplateParamLists.get(), 4116 TemplateParamLists.size(), 4117 /*never a friend*/ false, 4118 isExplicitSpecialization, 4119 Invalid)) { 4120 if (TemplateParams->size() > 0) { 4121 // There is no such thing as a variable template. 4122 Diag(D.getIdentifierLoc(), diag::err_template_variable) 4123 << II 4124 << SourceRange(TemplateParams->getTemplateLoc(), 4125 TemplateParams->getRAngleLoc()); 4126 return 0; 4127 } else { 4128 // There is an extraneous 'template<>' for this variable. Complain 4129 // about it, but allow the declaration of the variable. 4130 Diag(TemplateParams->getTemplateLoc(), 4131 diag::err_template_variable_noparams) 4132 << II 4133 << SourceRange(TemplateParams->getTemplateLoc(), 4134 TemplateParams->getRAngleLoc()); 4135 } 4136 } 4137 4138 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4139 D.getIdentifierLoc(), II, 4140 R, TInfo, SC, SCAsWritten); 4141 4142 // If this decl has an auto type in need of deduction, make a note of the 4143 // Decl so we can diagnose uses of it in its own initializer. 4144 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 4145 R->getContainedAutoType()) 4146 ParsingInitForAutoVars.insert(NewVD); 4147 4148 if (D.isInvalidType() || Invalid) 4149 NewVD->setInvalidDecl(); 4150 4151 SetNestedNameSpecifier(NewVD, D); 4152 4153 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 4154 NewVD->setTemplateParameterListsInfo(Context, 4155 TemplateParamLists.size(), 4156 TemplateParamLists.release()); 4157 } 4158 4159 if (D.getDeclSpec().isConstexprSpecified()) 4160 NewVD->setConstexpr(true); 4161 } 4162 4163 // Set the lexical context. If the declarator has a C++ scope specifier, the 4164 // lexical context will be different from the semantic context. 4165 NewVD->setLexicalDeclContext(CurContext); 4166 4167 if (D.getDeclSpec().isThreadSpecified()) { 4168 if (NewVD->hasLocalStorage()) 4169 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4170 else if (!Context.getTargetInfo().isTLSSupported()) 4171 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4172 else 4173 NewVD->setThreadSpecified(true); 4174 } 4175 4176 if (D.getDeclSpec().isModulePrivateSpecified()) { 4177 if (isExplicitSpecialization) 4178 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4179 << 2 4180 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4181 else if (NewVD->hasLocalStorage()) 4182 Diag(NewVD->getLocation(), diag::err_module_private_local) 4183 << 0 << NewVD->getDeclName() 4184 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4185 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4186 else 4187 NewVD->setModulePrivate(); 4188 } 4189 4190 // Handle attributes prior to checking for duplicates in MergeVarDecl 4191 ProcessDeclAttributes(S, NewVD, D); 4192 4193 // In auto-retain/release, infer strong retension for variables of 4194 // retainable type. 4195 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4196 NewVD->setInvalidDecl(); 4197 4198 // Handle GNU asm-label extension (encoded as an attribute). 4199 if (Expr *E = (Expr*)D.getAsmLabel()) { 4200 // The parser guarantees this is a string. 4201 StringLiteral *SE = cast<StringLiteral>(E); 4202 StringRef Label = SE->getString(); 4203 if (S->getFnParent() != 0) { 4204 switch (SC) { 4205 case SC_None: 4206 case SC_Auto: 4207 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4208 break; 4209 case SC_Register: 4210 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4211 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4212 break; 4213 case SC_Static: 4214 case SC_Extern: 4215 case SC_PrivateExtern: 4216 case SC_OpenCLWorkGroupLocal: 4217 break; 4218 } 4219 } 4220 4221 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4222 Context, Label)); 4223 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 4224 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 4225 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier()); 4226 if (I != ExtnameUndeclaredIdentifiers.end()) { 4227 NewVD->addAttr(I->second); 4228 ExtnameUndeclaredIdentifiers.erase(I); 4229 } 4230 } 4231 4232 // Diagnose shadowed variables before filtering for scope. 4233 if (!D.getCXXScopeSpec().isSet()) 4234 CheckShadow(S, NewVD, Previous); 4235 4236 // Don't consider existing declarations that are in a different 4237 // scope and are out-of-semantic-context declarations (if the new 4238 // declaration has linkage). 4239 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4240 isExplicitSpecialization); 4241 4242 if (!getLangOpts().CPlusPlus) { 4243 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4244 } else { 4245 // Merge the decl with the existing one if appropriate. 4246 if (!Previous.empty()) { 4247 if (Previous.isSingleResult() && 4248 isa<FieldDecl>(Previous.getFoundDecl()) && 4249 D.getCXXScopeSpec().isSet()) { 4250 // The user tried to define a non-static data member 4251 // out-of-line (C++ [dcl.meaning]p1). 4252 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4253 << D.getCXXScopeSpec().getRange(); 4254 Previous.clear(); 4255 NewVD->setInvalidDecl(); 4256 } 4257 } else if (D.getCXXScopeSpec().isSet()) { 4258 // No previous declaration in the qualifying scope. 4259 Diag(D.getIdentifierLoc(), diag::err_no_member) 4260 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4261 << D.getCXXScopeSpec().getRange(); 4262 NewVD->setInvalidDecl(); 4263 } 4264 4265 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4266 4267 // This is an explicit specialization of a static data member. Check it. 4268 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4269 CheckMemberSpecialization(NewVD, Previous)) 4270 NewVD->setInvalidDecl(); 4271 } 4272 4273 // If this is a locally-scoped extern C variable, update the map of 4274 // such variables. 4275 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4276 !NewVD->isInvalidDecl()) 4277 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4278 4279 // If there's a #pragma GCC visibility in scope, and this isn't a class 4280 // member, set the visibility of this variable. 4281 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4282 AddPushedVisibilityAttribute(NewVD); 4283 4284 MarkUnusedFileScopedDecl(NewVD); 4285 4286 return NewVD; 4287} 4288 4289/// \brief Diagnose variable or built-in function shadowing. Implements 4290/// -Wshadow. 4291/// 4292/// This method is called whenever a VarDecl is added to a "useful" 4293/// scope. 4294/// 4295/// \param S the scope in which the shadowing name is being declared 4296/// \param R the lookup of the name 4297/// 4298void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4299 // Return if warning is ignored. 4300 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4301 DiagnosticsEngine::Ignored) 4302 return; 4303 4304 // Don't diagnose declarations at file scope. 4305 if (D->hasGlobalStorage()) 4306 return; 4307 4308 DeclContext *NewDC = D->getDeclContext(); 4309 4310 // Only diagnose if we're shadowing an unambiguous field or variable. 4311 if (R.getResultKind() != LookupResult::Found) 4312 return; 4313 4314 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4315 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4316 return; 4317 4318 // Fields are not shadowed by variables in C++ static methods. 4319 if (isa<FieldDecl>(ShadowedDecl)) 4320 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4321 if (MD->isStatic()) 4322 return; 4323 4324 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4325 if (shadowedVar->isExternC()) { 4326 // For shadowing external vars, make sure that we point to the global 4327 // declaration, not a locally scoped extern declaration. 4328 for (VarDecl::redecl_iterator 4329 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4330 I != E; ++I) 4331 if (I->isFileVarDecl()) { 4332 ShadowedDecl = *I; 4333 break; 4334 } 4335 } 4336 4337 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4338 4339 // Only warn about certain kinds of shadowing for class members. 4340 if (NewDC && NewDC->isRecord()) { 4341 // In particular, don't warn about shadowing non-class members. 4342 if (!OldDC->isRecord()) 4343 return; 4344 4345 // TODO: should we warn about static data members shadowing 4346 // static data members from base classes? 4347 4348 // TODO: don't diagnose for inaccessible shadowed members. 4349 // This is hard to do perfectly because we might friend the 4350 // shadowing context, but that's just a false negative. 4351 } 4352 4353 // Determine what kind of declaration we're shadowing. 4354 unsigned Kind; 4355 if (isa<RecordDecl>(OldDC)) { 4356 if (isa<FieldDecl>(ShadowedDecl)) 4357 Kind = 3; // field 4358 else 4359 Kind = 2; // static data member 4360 } else if (OldDC->isFileContext()) 4361 Kind = 1; // global 4362 else 4363 Kind = 0; // local 4364 4365 DeclarationName Name = R.getLookupName(); 4366 4367 // Emit warning and note. 4368 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4369 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4370} 4371 4372/// \brief Check -Wshadow without the advantage of a previous lookup. 4373void Sema::CheckShadow(Scope *S, VarDecl *D) { 4374 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4375 DiagnosticsEngine::Ignored) 4376 return; 4377 4378 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4379 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4380 LookupName(R, S); 4381 CheckShadow(S, D, R); 4382} 4383 4384/// \brief Perform semantic checking on a newly-created variable 4385/// declaration. 4386/// 4387/// This routine performs all of the type-checking required for a 4388/// variable declaration once it has been built. It is used both to 4389/// check variables after they have been parsed and their declarators 4390/// have been translated into a declaration, and to check variables 4391/// that have been instantiated from a template. 4392/// 4393/// Sets NewVD->isInvalidDecl() if an error was encountered. 4394/// 4395/// Returns true if the variable declaration is a redeclaration. 4396bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4397 LookupResult &Previous) { 4398 // If the decl is already known invalid, don't check it. 4399 if (NewVD->isInvalidDecl()) 4400 return false; 4401 4402 QualType T = NewVD->getType(); 4403 4404 if (T->isObjCObjectType()) { 4405 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4406 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4407 T = Context.getObjCObjectPointerType(T); 4408 NewVD->setType(T); 4409 } 4410 4411 // Emit an error if an address space was applied to decl with local storage. 4412 // This includes arrays of objects with address space qualifiers, but not 4413 // automatic variables that point to other address spaces. 4414 // ISO/IEC TR 18037 S5.1.2 4415 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4416 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4417 NewVD->setInvalidDecl(); 4418 return false; 4419 } 4420 4421 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4422 && !NewVD->hasAttr<BlocksAttr>()) { 4423 if (getLangOpts().getGC() != LangOptions::NonGC) 4424 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4425 else 4426 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4427 } 4428 4429 bool isVM = T->isVariablyModifiedType(); 4430 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4431 NewVD->hasAttr<BlocksAttr>()) 4432 getCurFunction()->setHasBranchProtectedScope(); 4433 4434 if ((isVM && NewVD->hasLinkage()) || 4435 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4436 bool SizeIsNegative; 4437 llvm::APSInt Oversized; 4438 QualType FixedTy = 4439 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4440 Oversized); 4441 4442 if (FixedTy.isNull() && T->isVariableArrayType()) { 4443 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4444 // FIXME: This won't give the correct result for 4445 // int a[10][n]; 4446 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4447 4448 if (NewVD->isFileVarDecl()) 4449 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4450 << SizeRange; 4451 else if (NewVD->getStorageClass() == SC_Static) 4452 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4453 << SizeRange; 4454 else 4455 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4456 << SizeRange; 4457 NewVD->setInvalidDecl(); 4458 return false; 4459 } 4460 4461 if (FixedTy.isNull()) { 4462 if (NewVD->isFileVarDecl()) 4463 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4464 else 4465 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4466 NewVD->setInvalidDecl(); 4467 return false; 4468 } 4469 4470 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4471 NewVD->setType(FixedTy); 4472 } 4473 4474 if (Previous.empty() && NewVD->isExternC()) { 4475 // Since we did not find anything by this name and we're declaring 4476 // an extern "C" variable, look for a non-visible extern "C" 4477 // declaration with the same name. 4478 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4479 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4480 if (Pos != LocallyScopedExternalDecls.end()) 4481 Previous.addDecl(Pos->second); 4482 } 4483 4484 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4485 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4486 << T; 4487 NewVD->setInvalidDecl(); 4488 return false; 4489 } 4490 4491 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4492 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4493 NewVD->setInvalidDecl(); 4494 return false; 4495 } 4496 4497 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4498 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4499 NewVD->setInvalidDecl(); 4500 return false; 4501 } 4502 4503 if (NewVD->isConstexpr() && !T->isDependentType() && 4504 RequireLiteralType(NewVD->getLocation(), T, 4505 diag::err_constexpr_var_non_literal)) { 4506 NewVD->setInvalidDecl(); 4507 return false; 4508 } 4509 4510 if (!Previous.empty()) { 4511 MergeVarDecl(NewVD, Previous); 4512 return true; 4513 } 4514 return false; 4515} 4516 4517/// \brief Data used with FindOverriddenMethod 4518struct FindOverriddenMethodData { 4519 Sema *S; 4520 CXXMethodDecl *Method; 4521}; 4522 4523/// \brief Member lookup function that determines whether a given C++ 4524/// method overrides a method in a base class, to be used with 4525/// CXXRecordDecl::lookupInBases(). 4526static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4527 CXXBasePath &Path, 4528 void *UserData) { 4529 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4530 4531 FindOverriddenMethodData *Data 4532 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4533 4534 DeclarationName Name = Data->Method->getDeclName(); 4535 4536 // FIXME: Do we care about other names here too? 4537 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4538 // We really want to find the base class destructor here. 4539 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4540 CanQualType CT = Data->S->Context.getCanonicalType(T); 4541 4542 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4543 } 4544 4545 for (Path.Decls = BaseRecord->lookup(Name); 4546 Path.Decls.first != Path.Decls.second; 4547 ++Path.Decls.first) { 4548 NamedDecl *D = *Path.Decls.first; 4549 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4550 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4551 return true; 4552 } 4553 } 4554 4555 return false; 4556} 4557 4558static bool hasDelayedExceptionSpec(CXXMethodDecl *Method) { 4559 const FunctionProtoType *Proto =Method->getType()->getAs<FunctionProtoType>(); 4560 return Proto && Proto->getExceptionSpecType() == EST_Delayed; 4561} 4562 4563/// AddOverriddenMethods - See if a method overrides any in the base classes, 4564/// and if so, check that it's a valid override and remember it. 4565bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4566 // Look for virtual methods in base classes that this method might override. 4567 CXXBasePaths Paths; 4568 FindOverriddenMethodData Data; 4569 Data.Method = MD; 4570 Data.S = this; 4571 bool AddedAny = false; 4572 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4573 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4574 E = Paths.found_decls_end(); I != E; ++I) { 4575 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4576 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4577 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4578 (hasDelayedExceptionSpec(MD) || 4579 !CheckOverridingFunctionExceptionSpec(MD, OldMD)) && 4580 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4581 AddedAny = true; 4582 } 4583 } 4584 } 4585 } 4586 4587 return AddedAny; 4588} 4589 4590namespace { 4591 // Struct for holding all of the extra arguments needed by 4592 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4593 struct ActOnFDArgs { 4594 Scope *S; 4595 Declarator &D; 4596 MultiTemplateParamsArg TemplateParamLists; 4597 bool AddToScope; 4598 }; 4599} 4600 4601namespace { 4602 4603// Callback to only accept typo corrections that have a non-zero edit distance. 4604// Also only accept corrections that have the same parent decl. 4605class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4606 public: 4607 DifferentNameValidatorCCC(ASTContext &Context, FunctionDecl *TypoFD, 4608 CXXRecordDecl *Parent) 4609 : Context(Context), OriginalFD(TypoFD), 4610 ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {} 4611 4612 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4613 if (candidate.getEditDistance() == 0) 4614 return false; 4615 4616 llvm::SmallVector<unsigned, 1> MismatchedParams; 4617 for (TypoCorrection::const_decl_iterator CDecl = candidate.begin(), 4618 CDeclEnd = candidate.end(); 4619 CDecl != CDeclEnd; ++CDecl) { 4620 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4621 4622 if (FD && !FD->hasBody() && 4623 hasSimilarParameters(Context, FD, OriginalFD, MismatchedParams)) { 4624 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 4625 CXXRecordDecl *Parent = MD->getParent(); 4626 if (Parent && Parent->getCanonicalDecl() == ExpectedParent) 4627 return true; 4628 } else if (!ExpectedParent) { 4629 return true; 4630 } 4631 } 4632 } 4633 4634 return false; 4635 } 4636 4637 private: 4638 ASTContext &Context; 4639 FunctionDecl *OriginalFD; 4640 CXXRecordDecl *ExpectedParent; 4641}; 4642 4643} 4644 4645/// \brief Generate diagnostics for an invalid function redeclaration. 4646/// 4647/// This routine handles generating the diagnostic messages for an invalid 4648/// function redeclaration, including finding possible similar declarations 4649/// or performing typo correction if there are no previous declarations with 4650/// the same name. 4651/// 4652/// Returns a NamedDecl iff typo correction was performed and substituting in 4653/// the new declaration name does not cause new errors. 4654static NamedDecl* DiagnoseInvalidRedeclaration( 4655 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4656 ActOnFDArgs &ExtraArgs) { 4657 NamedDecl *Result = NULL; 4658 DeclarationName Name = NewFD->getDeclName(); 4659 DeclContext *NewDC = NewFD->getDeclContext(); 4660 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4661 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4662 llvm::SmallVector<unsigned, 1> MismatchedParams; 4663 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4664 TypoCorrection Correction; 4665 bool isFriendDecl = (SemaRef.getLangOpts().CPlusPlus && 4666 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4667 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4668 : diag::err_member_def_does_not_match; 4669 4670 NewFD->setInvalidDecl(); 4671 SemaRef.LookupQualifiedName(Prev, NewDC); 4672 assert(!Prev.isAmbiguous() && 4673 "Cannot have an ambiguity in previous-declaration lookup"); 4674 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 4675 DifferentNameValidatorCCC Validator(SemaRef.Context, NewFD, 4676 MD ? MD->getParent() : 0); 4677 if (!Prev.empty()) { 4678 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4679 Func != FuncEnd; ++Func) { 4680 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4681 if (FD && 4682 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4683 // Add 1 to the index so that 0 can mean the mismatch didn't 4684 // involve a parameter 4685 unsigned ParamNum = 4686 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4687 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4688 } 4689 } 4690 // If the qualified name lookup yielded nothing, try typo correction 4691 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4692 Prev.getLookupKind(), 0, 0, 4693 Validator, NewDC))) { 4694 // Trap errors. 4695 Sema::SFINAETrap Trap(SemaRef); 4696 4697 // Set up everything for the call to ActOnFunctionDeclarator 4698 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4699 ExtraArgs.D.getIdentifierLoc()); 4700 Previous.clear(); 4701 Previous.setLookupName(Correction.getCorrection()); 4702 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4703 CDeclEnd = Correction.end(); 4704 CDecl != CDeclEnd; ++CDecl) { 4705 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4706 if (FD && !FD->hasBody() && 4707 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4708 Previous.addDecl(FD); 4709 } 4710 } 4711 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4712 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4713 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4714 // eliminate the need for the parameter pack ExtraArgs. 4715 Result = SemaRef.ActOnFunctionDeclarator( 4716 ExtraArgs.S, ExtraArgs.D, 4717 Correction.getCorrectionDecl()->getDeclContext(), 4718 NewFD->getTypeSourceInfo(), Previous, ExtraArgs.TemplateParamLists, 4719 ExtraArgs.AddToScope); 4720 if (Trap.hasErrorOccurred()) { 4721 // Pretend the typo correction never occurred 4722 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4723 ExtraArgs.D.getIdentifierLoc()); 4724 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4725 Previous.clear(); 4726 Previous.setLookupName(Name); 4727 Result = NULL; 4728 } else { 4729 for (LookupResult::iterator Func = Previous.begin(), 4730 FuncEnd = Previous.end(); 4731 Func != FuncEnd; ++Func) { 4732 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4733 NearMatches.push_back(std::make_pair(FD, 0)); 4734 } 4735 } 4736 if (NearMatches.empty()) { 4737 // Ignore the correction if it didn't yield any close FunctionDecl matches 4738 Correction = TypoCorrection(); 4739 } else { 4740 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4741 : diag::err_member_def_does_not_match_suggest; 4742 } 4743 } 4744 4745 if (Correction) { 4746 SourceRange FixItLoc(NewFD->getLocation()); 4747 CXXScopeSpec &SS = ExtraArgs.D.getCXXScopeSpec(); 4748 if (Correction.getCorrectionSpecifier() && SS.isValid()) 4749 FixItLoc.setBegin(SS.getBeginLoc()); 4750 SemaRef.Diag(NewFD->getLocStart(), DiagMsg) 4751 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOpts()) 4752 << FixItHint::CreateReplacement( 4753 FixItLoc, Correction.getAsString(SemaRef.getLangOpts())); 4754 } else { 4755 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4756 << Name << NewDC << NewFD->getLocation(); 4757 } 4758 4759 bool NewFDisConst = false; 4760 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4761 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4762 4763 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4764 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4765 NearMatch != NearMatchEnd; ++NearMatch) { 4766 FunctionDecl *FD = NearMatch->first; 4767 bool FDisConst = false; 4768 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4769 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4770 4771 if (unsigned Idx = NearMatch->second) { 4772 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4773 SourceLocation Loc = FDParam->getTypeSpecStartLoc(); 4774 if (Loc.isInvalid()) Loc = FD->getLocation(); 4775 SemaRef.Diag(Loc, diag::note_member_def_close_param_match) 4776 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4777 } else if (Correction) { 4778 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4779 << Correction.getQuoted(SemaRef.getLangOpts()); 4780 } else if (FDisConst != NewFDisConst) { 4781 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4782 << NewFDisConst << FD->getSourceRange().getEnd(); 4783 } else 4784 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4785 } 4786 return Result; 4787} 4788 4789static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4790 Declarator &D) { 4791 switch (D.getDeclSpec().getStorageClassSpec()) { 4792 default: llvm_unreachable("Unknown storage class!"); 4793 case DeclSpec::SCS_auto: 4794 case DeclSpec::SCS_register: 4795 case DeclSpec::SCS_mutable: 4796 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4797 diag::err_typecheck_sclass_func); 4798 D.setInvalidType(); 4799 break; 4800 case DeclSpec::SCS_unspecified: break; 4801 case DeclSpec::SCS_extern: return SC_Extern; 4802 case DeclSpec::SCS_static: { 4803 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4804 // C99 6.7.1p5: 4805 // The declaration of an identifier for a function that has 4806 // block scope shall have no explicit storage-class specifier 4807 // other than extern 4808 // See also (C++ [dcl.stc]p4). 4809 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4810 diag::err_static_block_func); 4811 break; 4812 } else 4813 return SC_Static; 4814 } 4815 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4816 } 4817 4818 // No explicit storage class has already been returned 4819 return SC_None; 4820} 4821 4822static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4823 DeclContext *DC, QualType &R, 4824 TypeSourceInfo *TInfo, 4825 FunctionDecl::StorageClass SC, 4826 bool &IsVirtualOkay) { 4827 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4828 DeclarationName Name = NameInfo.getName(); 4829 4830 FunctionDecl *NewFD = 0; 4831 bool isInline = D.getDeclSpec().isInlineSpecified(); 4832 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4833 FunctionDecl::StorageClass SCAsWritten 4834 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4835 4836 if (!SemaRef.getLangOpts().CPlusPlus) { 4837 // Determine whether the function was written with a 4838 // prototype. This true when: 4839 // - there is a prototype in the declarator, or 4840 // - the type R of the function is some kind of typedef or other reference 4841 // to a type name (which eventually refers to a function type). 4842 bool HasPrototype = 4843 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4844 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4845 4846 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4847 D.getLocStart(), NameInfo, R, 4848 TInfo, SC, SCAsWritten, isInline, 4849 HasPrototype); 4850 if (D.isInvalidType()) 4851 NewFD->setInvalidDecl(); 4852 4853 // Set the lexical context. 4854 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4855 4856 return NewFD; 4857 } 4858 4859 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4860 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4861 4862 // Check that the return type is not an abstract class type. 4863 // For record types, this is done by the AbstractClassUsageDiagnoser once 4864 // the class has been completely parsed. 4865 if (!DC->isRecord() && 4866 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4867 R->getAs<FunctionType>()->getResultType(), 4868 diag::err_abstract_type_in_decl, 4869 SemaRef.AbstractReturnType)) 4870 D.setInvalidType(); 4871 4872 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4873 // This is a C++ constructor declaration. 4874 assert(DC->isRecord() && 4875 "Constructors can only be declared in a member context"); 4876 4877 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4878 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4879 D.getLocStart(), NameInfo, 4880 R, TInfo, isExplicit, isInline, 4881 /*isImplicitlyDeclared=*/false, 4882 isConstexpr); 4883 4884 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4885 // This is a C++ destructor declaration. 4886 if (DC->isRecord()) { 4887 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4888 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4889 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4890 SemaRef.Context, Record, 4891 D.getLocStart(), 4892 NameInfo, R, TInfo, isInline, 4893 /*isImplicitlyDeclared=*/false); 4894 4895 // If the class is complete, then we now create the implicit exception 4896 // specification. If the class is incomplete or dependent, we can't do 4897 // it yet. 4898 if (SemaRef.getLangOpts().CPlusPlus0x && !Record->isDependentType() && 4899 Record->getDefinition() && !Record->isBeingDefined() && 4900 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4901 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4902 } 4903 4904 IsVirtualOkay = true; 4905 return NewDD; 4906 4907 } else { 4908 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4909 D.setInvalidType(); 4910 4911 // Create a FunctionDecl to satisfy the function definition parsing 4912 // code path. 4913 return FunctionDecl::Create(SemaRef.Context, DC, 4914 D.getLocStart(), 4915 D.getIdentifierLoc(), Name, R, TInfo, 4916 SC, SCAsWritten, isInline, 4917 /*hasPrototype=*/true, isConstexpr); 4918 } 4919 4920 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4921 if (!DC->isRecord()) { 4922 SemaRef.Diag(D.getIdentifierLoc(), 4923 diag::err_conv_function_not_member); 4924 return 0; 4925 } 4926 4927 SemaRef.CheckConversionDeclarator(D, R, SC); 4928 IsVirtualOkay = true; 4929 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4930 D.getLocStart(), NameInfo, 4931 R, TInfo, isInline, isExplicit, 4932 isConstexpr, SourceLocation()); 4933 4934 } else if (DC->isRecord()) { 4935 // If the name of the function is the same as the name of the record, 4936 // then this must be an invalid constructor that has a return type. 4937 // (The parser checks for a return type and makes the declarator a 4938 // constructor if it has no return type). 4939 if (Name.getAsIdentifierInfo() && 4940 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4941 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4942 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4943 << SourceRange(D.getIdentifierLoc()); 4944 return 0; 4945 } 4946 4947 bool isStatic = SC == SC_Static; 4948 4949 // [class.free]p1: 4950 // Any allocation function for a class T is a static member 4951 // (even if not explicitly declared static). 4952 if (Name.getCXXOverloadedOperator() == OO_New || 4953 Name.getCXXOverloadedOperator() == OO_Array_New) 4954 isStatic = true; 4955 4956 // [class.free]p6 Any deallocation function for a class X is a static member 4957 // (even if not explicitly declared static). 4958 if (Name.getCXXOverloadedOperator() == OO_Delete || 4959 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4960 isStatic = true; 4961 4962 IsVirtualOkay = !isStatic; 4963 4964 // This is a C++ method declaration. 4965 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4966 D.getLocStart(), NameInfo, R, 4967 TInfo, isStatic, SCAsWritten, isInline, 4968 isConstexpr, SourceLocation()); 4969 4970 } else { 4971 // Determine whether the function was written with a 4972 // prototype. This true when: 4973 // - we're in C++ (where every function has a prototype), 4974 return FunctionDecl::Create(SemaRef.Context, DC, 4975 D.getLocStart(), 4976 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4977 true/*HasPrototype*/, isConstexpr); 4978 } 4979} 4980 4981NamedDecl* 4982Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4983 TypeSourceInfo *TInfo, LookupResult &Previous, 4984 MultiTemplateParamsArg TemplateParamLists, 4985 bool &AddToScope) { 4986 QualType R = TInfo->getType(); 4987 4988 assert(R.getTypePtr()->isFunctionType()); 4989 4990 // TODO: consider using NameInfo for diagnostic. 4991 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4992 DeclarationName Name = NameInfo.getName(); 4993 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4994 4995 if (D.getDeclSpec().isThreadSpecified()) 4996 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4997 4998 // Do not allow returning a objc interface by-value. 4999 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 5000 Diag(D.getIdentifierLoc(), 5001 diag::err_object_cannot_be_passed_returned_by_value) << 0 5002 << R->getAs<FunctionType>()->getResultType() 5003 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 5004 5005 QualType T = R->getAs<FunctionType>()->getResultType(); 5006 T = Context.getObjCObjectPointerType(T); 5007 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 5008 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 5009 R = Context.getFunctionType(T, FPT->arg_type_begin(), 5010 FPT->getNumArgs(), EPI); 5011 } 5012 else if (isa<FunctionNoProtoType>(R)) 5013 R = Context.getFunctionNoProtoType(T); 5014 } 5015 5016 bool isFriend = false; 5017 FunctionTemplateDecl *FunctionTemplate = 0; 5018 bool isExplicitSpecialization = false; 5019 bool isFunctionTemplateSpecialization = false; 5020 bool isDependentClassScopeExplicitSpecialization = false; 5021 bool isVirtualOkay = false; 5022 5023 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 5024 isVirtualOkay); 5025 if (!NewFD) return 0; 5026 5027 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 5028 NewFD->setTopLevelDeclInObjCContainer(); 5029 5030 if (getLangOpts().CPlusPlus) { 5031 bool isInline = D.getDeclSpec().isInlineSpecified(); 5032 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5033 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 5034 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 5035 isFriend = D.getDeclSpec().isFriendSpecified(); 5036 if (isFriend && !isInline && D.isFunctionDefinition()) { 5037 // C++ [class.friend]p5 5038 // A function can be defined in a friend declaration of a 5039 // class . . . . Such a function is implicitly inline. 5040 NewFD->setImplicitlyInline(); 5041 } 5042 5043 SetNestedNameSpecifier(NewFD, D); 5044 isExplicitSpecialization = false; 5045 isFunctionTemplateSpecialization = false; 5046 if (D.isInvalidType()) 5047 NewFD->setInvalidDecl(); 5048 5049 // Set the lexical context. If the declarator has a C++ 5050 // scope specifier, or is the object of a friend declaration, the 5051 // lexical context will be different from the semantic context. 5052 NewFD->setLexicalDeclContext(CurContext); 5053 5054 // Match up the template parameter lists with the scope specifier, then 5055 // determine whether we have a template or a template specialization. 5056 bool Invalid = false; 5057 if (TemplateParameterList *TemplateParams 5058 = MatchTemplateParametersToScopeSpecifier( 5059 D.getDeclSpec().getLocStart(), 5060 D.getIdentifierLoc(), 5061 D.getCXXScopeSpec(), 5062 TemplateParamLists.get(), 5063 TemplateParamLists.size(), 5064 isFriend, 5065 isExplicitSpecialization, 5066 Invalid)) { 5067 if (TemplateParams->size() > 0) { 5068 // This is a function template 5069 5070 // Check that we can declare a template here. 5071 if (CheckTemplateDeclScope(S, TemplateParams)) 5072 return 0; 5073 5074 // A destructor cannot be a template. 5075 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 5076 Diag(NewFD->getLocation(), diag::err_destructor_template); 5077 return 0; 5078 } 5079 5080 // If we're adding a template to a dependent context, we may need to 5081 // rebuilding some of the types used within the template parameter list, 5082 // now that we know what the current instantiation is. 5083 if (DC->isDependentContext()) { 5084 ContextRAII SavedContext(*this, DC); 5085 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 5086 Invalid = true; 5087 } 5088 5089 5090 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 5091 NewFD->getLocation(), 5092 Name, TemplateParams, 5093 NewFD); 5094 FunctionTemplate->setLexicalDeclContext(CurContext); 5095 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 5096 5097 // For source fidelity, store the other template param lists. 5098 if (TemplateParamLists.size() > 1) { 5099 NewFD->setTemplateParameterListsInfo(Context, 5100 TemplateParamLists.size() - 1, 5101 TemplateParamLists.release()); 5102 } 5103 } else { 5104 // This is a function template specialization. 5105 isFunctionTemplateSpecialization = true; 5106 // For source fidelity, store all the template param lists. 5107 NewFD->setTemplateParameterListsInfo(Context, 5108 TemplateParamLists.size(), 5109 TemplateParamLists.release()); 5110 5111 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 5112 if (isFriend) { 5113 // We want to remove the "template<>", found here. 5114 SourceRange RemoveRange = TemplateParams->getSourceRange(); 5115 5116 // If we remove the template<> and the name is not a 5117 // template-id, we're actually silently creating a problem: 5118 // the friend declaration will refer to an untemplated decl, 5119 // and clearly the user wants a template specialization. So 5120 // we need to insert '<>' after the name. 5121 SourceLocation InsertLoc; 5122 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 5123 InsertLoc = D.getName().getSourceRange().getEnd(); 5124 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 5125 } 5126 5127 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 5128 << Name << RemoveRange 5129 << FixItHint::CreateRemoval(RemoveRange) 5130 << FixItHint::CreateInsertion(InsertLoc, "<>"); 5131 } 5132 } 5133 } 5134 else { 5135 // All template param lists were matched against the scope specifier: 5136 // this is NOT (an explicit specialization of) a template. 5137 if (TemplateParamLists.size() > 0) 5138 // For source fidelity, store all the template param lists. 5139 NewFD->setTemplateParameterListsInfo(Context, 5140 TemplateParamLists.size(), 5141 TemplateParamLists.release()); 5142 } 5143 5144 if (Invalid) { 5145 NewFD->setInvalidDecl(); 5146 if (FunctionTemplate) 5147 FunctionTemplate->setInvalidDecl(); 5148 } 5149 5150 // If we see "T var();" at block scope, where T is a class type, it is 5151 // probably an attempt to initialize a variable, not a function declaration. 5152 // We don't catch this case earlier, since there is no ambiguity here. 5153 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 5154 CurContext->isFunctionOrMethod() && 5155 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 5156 D.getDeclSpec().getStorageClassSpecAsWritten() 5157 == DeclSpec::SCS_unspecified) { 5158 QualType T = R->getAs<FunctionType>()->getResultType(); 5159 DeclaratorChunk &C = D.getTypeObject(0); 5160 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 5161 !C.Fun.TrailingReturnType && 5162 C.Fun.getExceptionSpecType() == EST_None) { 5163 SourceRange ParenRange(C.Loc, C.EndLoc); 5164 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 5165 5166 // If the declaration looks like: 5167 // T var1, 5168 // f(); 5169 // and name lookup finds a function named 'f', then the ',' was 5170 // probably intended to be a ';'. 5171 if (!D.isFirstDeclarator() && D.getIdentifier()) { 5172 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 5173 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 5174 if (Comma.getFileID() != Name.getFileID() || 5175 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 5176 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 5177 LookupOrdinaryName); 5178 if (LookupName(Result, S)) 5179 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 5180 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 5181 } 5182 } 5183 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 5184 // Empty parens mean value-initialization, and no parens mean default 5185 // initialization. These are equivalent if the default constructor is 5186 // user-provided, or if zero-initialization is a no-op. 5187 if (RD && RD->hasDefinition() && 5188 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 5189 Diag(C.Loc, diag::note_empty_parens_default_ctor) 5190 << FixItHint::CreateRemoval(ParenRange); 5191 else { 5192 std::string Init = getFixItZeroInitializerForType(T); 5193 if (Init.empty() && LangOpts.CPlusPlus0x) 5194 Init = "{}"; 5195 if (!Init.empty()) 5196 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5197 << FixItHint::CreateReplacement(ParenRange, Init); 5198 } 5199 } 5200 } 5201 5202 // C++ [dcl.fct.spec]p5: 5203 // The virtual specifier shall only be used in declarations of 5204 // nonstatic class member functions that appear within a 5205 // member-specification of a class declaration; see 10.3. 5206 // 5207 if (isVirtual && !NewFD->isInvalidDecl()) { 5208 if (!isVirtualOkay) { 5209 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5210 diag::err_virtual_non_function); 5211 } else if (!CurContext->isRecord()) { 5212 // 'virtual' was specified outside of the class. 5213 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5214 diag::err_virtual_out_of_class) 5215 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5216 } else if (NewFD->getDescribedFunctionTemplate()) { 5217 // C++ [temp.mem]p3: 5218 // A member function template shall not be virtual. 5219 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5220 diag::err_virtual_member_function_template) 5221 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5222 } else { 5223 // Okay: Add virtual to the method. 5224 NewFD->setVirtualAsWritten(true); 5225 } 5226 } 5227 5228 // C++ [dcl.fct.spec]p3: 5229 // The inline specifier shall not appear on a block scope function 5230 // declaration. 5231 if (isInline && !NewFD->isInvalidDecl()) { 5232 if (CurContext->isFunctionOrMethod()) { 5233 // 'inline' is not allowed on block scope function declaration. 5234 Diag(D.getDeclSpec().getInlineSpecLoc(), 5235 diag::err_inline_declaration_block_scope) << Name 5236 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5237 } 5238 } 5239 5240 // C++ [dcl.fct.spec]p6: 5241 // The explicit specifier shall be used only in the declaration of a 5242 // constructor or conversion function within its class definition; 5243 // see 12.3.1 and 12.3.2. 5244 if (isExplicit && !NewFD->isInvalidDecl()) { 5245 if (!CurContext->isRecord()) { 5246 // 'explicit' was specified outside of the class. 5247 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5248 diag::err_explicit_out_of_class) 5249 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5250 } else if (!isa<CXXConstructorDecl>(NewFD) && 5251 !isa<CXXConversionDecl>(NewFD)) { 5252 // 'explicit' was specified on a function that wasn't a constructor 5253 // or conversion function. 5254 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5255 diag::err_explicit_non_ctor_or_conv_function) 5256 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5257 } 5258 } 5259 5260 if (isConstexpr) { 5261 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5262 // are implicitly inline. 5263 NewFD->setImplicitlyInline(); 5264 5265 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5266 // be either constructors or to return a literal type. Therefore, 5267 // destructors cannot be declared constexpr. 5268 if (isa<CXXDestructorDecl>(NewFD)) 5269 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5270 } 5271 5272 // If __module_private__ was specified, mark the function accordingly. 5273 if (D.getDeclSpec().isModulePrivateSpecified()) { 5274 if (isFunctionTemplateSpecialization) { 5275 SourceLocation ModulePrivateLoc 5276 = D.getDeclSpec().getModulePrivateSpecLoc(); 5277 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5278 << 0 5279 << FixItHint::CreateRemoval(ModulePrivateLoc); 5280 } else { 5281 NewFD->setModulePrivate(); 5282 if (FunctionTemplate) 5283 FunctionTemplate->setModulePrivate(); 5284 } 5285 } 5286 5287 if (isFriend) { 5288 // For now, claim that the objects have no previous declaration. 5289 if (FunctionTemplate) { 5290 FunctionTemplate->setObjectOfFriendDecl(false); 5291 FunctionTemplate->setAccess(AS_public); 5292 } 5293 NewFD->setObjectOfFriendDecl(false); 5294 NewFD->setAccess(AS_public); 5295 } 5296 5297 // If a function is defined as defaulted or deleted, mark it as such now. 5298 switch (D.getFunctionDefinitionKind()) { 5299 case FDK_Declaration: 5300 case FDK_Definition: 5301 break; 5302 5303 case FDK_Defaulted: 5304 NewFD->setDefaulted(); 5305 break; 5306 5307 case FDK_Deleted: 5308 NewFD->setDeletedAsWritten(); 5309 break; 5310 } 5311 5312 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5313 D.isFunctionDefinition()) { 5314 // C++ [class.mfct]p2: 5315 // A member function may be defined (8.4) in its class definition, in 5316 // which case it is an inline member function (7.1.2) 5317 NewFD->setImplicitlyInline(); 5318 } 5319 5320 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5321 !CurContext->isRecord()) { 5322 // C++ [class.static]p1: 5323 // A data or function member of a class may be declared static 5324 // in a class definition, in which case it is a static member of 5325 // the class. 5326 5327 // Complain about the 'static' specifier if it's on an out-of-line 5328 // member function definition. 5329 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5330 diag::err_static_out_of_line) 5331 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5332 } 5333 } 5334 5335 // Filter out previous declarations that don't match the scope. 5336 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5337 isExplicitSpecialization || 5338 isFunctionTemplateSpecialization); 5339 5340 // Handle GNU asm-label extension (encoded as an attribute). 5341 if (Expr *E = (Expr*) D.getAsmLabel()) { 5342 // The parser guarantees this is a string. 5343 StringLiteral *SE = cast<StringLiteral>(E); 5344 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5345 SE->getString())); 5346 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 5347 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 5348 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); 5349 if (I != ExtnameUndeclaredIdentifiers.end()) { 5350 NewFD->addAttr(I->second); 5351 ExtnameUndeclaredIdentifiers.erase(I); 5352 } 5353 } 5354 5355 // Copy the parameter declarations from the declarator D to the function 5356 // declaration NewFD, if they are available. First scavenge them into Params. 5357 SmallVector<ParmVarDecl*, 16> Params; 5358 if (D.isFunctionDeclarator()) { 5359 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5360 5361 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5362 // function that takes no arguments, not a function that takes a 5363 // single void argument. 5364 // We let through "const void" here because Sema::GetTypeForDeclarator 5365 // already checks for that case. 5366 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5367 FTI.ArgInfo[0].Param && 5368 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5369 // Empty arg list, don't push any params. 5370 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5371 5372 // In C++, the empty parameter-type-list must be spelled "void"; a 5373 // typedef of void is not permitted. 5374 if (getLangOpts().CPlusPlus && 5375 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5376 bool IsTypeAlias = false; 5377 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5378 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5379 else if (const TemplateSpecializationType *TST = 5380 Param->getType()->getAs<TemplateSpecializationType>()) 5381 IsTypeAlias = TST->isTypeAlias(); 5382 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5383 << IsTypeAlias; 5384 } 5385 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5386 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5387 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5388 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5389 Param->setDeclContext(NewFD); 5390 Params.push_back(Param); 5391 5392 if (Param->isInvalidDecl()) 5393 NewFD->setInvalidDecl(); 5394 } 5395 } 5396 5397 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5398 // When we're declaring a function with a typedef, typeof, etc as in the 5399 // following example, we'll need to synthesize (unnamed) 5400 // parameters for use in the declaration. 5401 // 5402 // @code 5403 // typedef void fn(int); 5404 // fn f; 5405 // @endcode 5406 5407 // Synthesize a parameter for each argument type. 5408 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5409 AE = FT->arg_type_end(); AI != AE; ++AI) { 5410 ParmVarDecl *Param = 5411 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5412 Param->setScopeInfo(0, Params.size()); 5413 Params.push_back(Param); 5414 } 5415 } else { 5416 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5417 "Should not need args for typedef of non-prototype fn"); 5418 } 5419 5420 // Finally, we know we have the right number of parameters, install them. 5421 NewFD->setParams(Params); 5422 5423 // Find all anonymous symbols defined during the declaration of this function 5424 // and add to NewFD. This lets us track decls such 'enum Y' in: 5425 // 5426 // void f(enum Y {AA} x) {} 5427 // 5428 // which would otherwise incorrectly end up in the translation unit scope. 5429 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope); 5430 DeclsInPrototypeScope.clear(); 5431 5432 // Process the non-inheritable attributes on this declaration. 5433 ProcessDeclAttributes(S, NewFD, D, 5434 /*NonInheritable=*/true, /*Inheritable=*/false); 5435 5436 // Functions returning a variably modified type violate C99 6.7.5.2p2 5437 // because all functions have linkage. 5438 if (!NewFD->isInvalidDecl() && 5439 NewFD->getResultType()->isVariablyModifiedType()) { 5440 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5441 NewFD->setInvalidDecl(); 5442 } 5443 5444 // Handle attributes. 5445 ProcessDeclAttributes(S, NewFD, D, 5446 /*NonInheritable=*/false, /*Inheritable=*/true); 5447 5448 if (!getLangOpts().CPlusPlus) { 5449 // Perform semantic checking on the function declaration. 5450 bool isExplicitSpecialization=false; 5451 if (!NewFD->isInvalidDecl()) { 5452 if (NewFD->isMain()) 5453 CheckMain(NewFD, D.getDeclSpec()); 5454 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5455 isExplicitSpecialization)); 5456 } 5457 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5458 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5459 "previous declaration set still overloaded"); 5460 } else { 5461 // If the declarator is a template-id, translate the parser's template 5462 // argument list into our AST format. 5463 bool HasExplicitTemplateArgs = false; 5464 TemplateArgumentListInfo TemplateArgs; 5465 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5466 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5467 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5468 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5469 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5470 TemplateId->getTemplateArgs(), 5471 TemplateId->NumArgs); 5472 translateTemplateArguments(TemplateArgsPtr, 5473 TemplateArgs); 5474 TemplateArgsPtr.release(); 5475 5476 HasExplicitTemplateArgs = true; 5477 5478 if (NewFD->isInvalidDecl()) { 5479 HasExplicitTemplateArgs = false; 5480 } else if (FunctionTemplate) { 5481 // Function template with explicit template arguments. 5482 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5483 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5484 5485 HasExplicitTemplateArgs = false; 5486 } else if (!isFunctionTemplateSpecialization && 5487 !D.getDeclSpec().isFriendSpecified()) { 5488 // We have encountered something that the user meant to be a 5489 // specialization (because it has explicitly-specified template 5490 // arguments) but that was not introduced with a "template<>" (or had 5491 // too few of them). 5492 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5493 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5494 << FixItHint::CreateInsertion( 5495 D.getDeclSpec().getLocStart(), 5496 "template<> "); 5497 isFunctionTemplateSpecialization = true; 5498 } else { 5499 // "friend void foo<>(int);" is an implicit specialization decl. 5500 isFunctionTemplateSpecialization = true; 5501 } 5502 } else if (isFriend && isFunctionTemplateSpecialization) { 5503 // This combination is only possible in a recovery case; the user 5504 // wrote something like: 5505 // template <> friend void foo(int); 5506 // which we're recovering from as if the user had written: 5507 // friend void foo<>(int); 5508 // Go ahead and fake up a template id. 5509 HasExplicitTemplateArgs = true; 5510 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5511 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5512 } 5513 5514 // If it's a friend (and only if it's a friend), it's possible 5515 // that either the specialized function type or the specialized 5516 // template is dependent, and therefore matching will fail. In 5517 // this case, don't check the specialization yet. 5518 bool InstantiationDependent = false; 5519 if (isFunctionTemplateSpecialization && isFriend && 5520 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5521 TemplateSpecializationType::anyDependentTemplateArguments( 5522 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5523 InstantiationDependent))) { 5524 assert(HasExplicitTemplateArgs && 5525 "friend function specialization without template args"); 5526 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5527 Previous)) 5528 NewFD->setInvalidDecl(); 5529 } else if (isFunctionTemplateSpecialization) { 5530 if (CurContext->isDependentContext() && CurContext->isRecord() 5531 && !isFriend) { 5532 isDependentClassScopeExplicitSpecialization = true; 5533 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ? 5534 diag::ext_function_specialization_in_class : 5535 diag::err_function_specialization_in_class) 5536 << NewFD->getDeclName(); 5537 } else if (CheckFunctionTemplateSpecialization(NewFD, 5538 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5539 Previous)) 5540 NewFD->setInvalidDecl(); 5541 5542 // C++ [dcl.stc]p1: 5543 // A storage-class-specifier shall not be specified in an explicit 5544 // specialization (14.7.3) 5545 if (SC != SC_None) { 5546 if (SC != NewFD->getStorageClass()) 5547 Diag(NewFD->getLocation(), 5548 diag::err_explicit_specialization_inconsistent_storage_class) 5549 << SC 5550 << FixItHint::CreateRemoval( 5551 D.getDeclSpec().getStorageClassSpecLoc()); 5552 5553 else 5554 Diag(NewFD->getLocation(), 5555 diag::ext_explicit_specialization_storage_class) 5556 << FixItHint::CreateRemoval( 5557 D.getDeclSpec().getStorageClassSpecLoc()); 5558 } 5559 5560 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5561 if (CheckMemberSpecialization(NewFD, Previous)) 5562 NewFD->setInvalidDecl(); 5563 } 5564 5565 // Perform semantic checking on the function declaration. 5566 if (!isDependentClassScopeExplicitSpecialization) { 5567 if (NewFD->isInvalidDecl()) { 5568 // If this is a class member, mark the class invalid immediately. 5569 // This avoids some consistency errors later. 5570 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5571 methodDecl->getParent()->setInvalidDecl(); 5572 } else { 5573 if (NewFD->isMain()) 5574 CheckMain(NewFD, D.getDeclSpec()); 5575 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5576 isExplicitSpecialization)); 5577 } 5578 } 5579 5580 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5581 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5582 "previous declaration set still overloaded"); 5583 5584 NamedDecl *PrincipalDecl = (FunctionTemplate 5585 ? cast<NamedDecl>(FunctionTemplate) 5586 : NewFD); 5587 5588 if (isFriend && D.isRedeclaration()) { 5589 AccessSpecifier Access = AS_public; 5590 if (!NewFD->isInvalidDecl()) 5591 Access = NewFD->getPreviousDecl()->getAccess(); 5592 5593 NewFD->setAccess(Access); 5594 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5595 5596 PrincipalDecl->setObjectOfFriendDecl(true); 5597 } 5598 5599 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5600 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5601 PrincipalDecl->setNonMemberOperator(); 5602 5603 // If we have a function template, check the template parameter 5604 // list. This will check and merge default template arguments. 5605 if (FunctionTemplate) { 5606 FunctionTemplateDecl *PrevTemplate = 5607 FunctionTemplate->getPreviousDecl(); 5608 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5609 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5610 D.getDeclSpec().isFriendSpecified() 5611 ? (D.isFunctionDefinition() 5612 ? TPC_FriendFunctionTemplateDefinition 5613 : TPC_FriendFunctionTemplate) 5614 : (D.getCXXScopeSpec().isSet() && 5615 DC && DC->isRecord() && 5616 DC->isDependentContext()) 5617 ? TPC_ClassTemplateMember 5618 : TPC_FunctionTemplate); 5619 } 5620 5621 if (NewFD->isInvalidDecl()) { 5622 // Ignore all the rest of this. 5623 } else if (!D.isRedeclaration()) { 5624 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5625 AddToScope }; 5626 // Fake up an access specifier if it's supposed to be a class member. 5627 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5628 NewFD->setAccess(AS_public); 5629 5630 // Qualified decls generally require a previous declaration. 5631 if (D.getCXXScopeSpec().isSet()) { 5632 // ...with the major exception of templated-scope or 5633 // dependent-scope friend declarations. 5634 5635 // TODO: we currently also suppress this check in dependent 5636 // contexts because (1) the parameter depth will be off when 5637 // matching friend templates and (2) we might actually be 5638 // selecting a friend based on a dependent factor. But there 5639 // are situations where these conditions don't apply and we 5640 // can actually do this check immediately. 5641 if (isFriend && 5642 (TemplateParamLists.size() || 5643 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5644 CurContext->isDependentContext())) { 5645 // ignore these 5646 } else { 5647 // The user tried to provide an out-of-line definition for a 5648 // function that is a member of a class or namespace, but there 5649 // was no such member function declared (C++ [class.mfct]p2, 5650 // C++ [namespace.memdef]p2). For example: 5651 // 5652 // class X { 5653 // void f() const; 5654 // }; 5655 // 5656 // void X::f() { } // ill-formed 5657 // 5658 // Complain about this problem, and attempt to suggest close 5659 // matches (e.g., those that differ only in cv-qualifiers and 5660 // whether the parameter types are references). 5661 5662 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5663 NewFD, 5664 ExtraArgs)) { 5665 AddToScope = ExtraArgs.AddToScope; 5666 return Result; 5667 } 5668 } 5669 5670 // Unqualified local friend declarations are required to resolve 5671 // to something. 5672 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5673 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5674 NewFD, 5675 ExtraArgs)) { 5676 AddToScope = ExtraArgs.AddToScope; 5677 return Result; 5678 } 5679 } 5680 5681 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5682 !isFriend && !isFunctionTemplateSpecialization && 5683 !isExplicitSpecialization) { 5684 // An out-of-line member function declaration must also be a 5685 // definition (C++ [dcl.meaning]p1). 5686 // Note that this is not the case for explicit specializations of 5687 // function templates or member functions of class templates, per 5688 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5689 // extension for compatibility with old SWIG code which likes to 5690 // generate them. 5691 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5692 << D.getCXXScopeSpec().getRange(); 5693 } 5694 } 5695 5696 AddKnownFunctionAttributes(NewFD); 5697 5698 if (NewFD->hasAttr<OverloadableAttr>() && 5699 !NewFD->getType()->getAs<FunctionProtoType>()) { 5700 Diag(NewFD->getLocation(), 5701 diag::err_attribute_overloadable_no_prototype) 5702 << NewFD; 5703 5704 // Turn this into a variadic function with no parameters. 5705 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5706 FunctionProtoType::ExtProtoInfo EPI; 5707 EPI.Variadic = true; 5708 EPI.ExtInfo = FT->getExtInfo(); 5709 5710 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5711 NewFD->setType(R); 5712 } 5713 5714 // If there's a #pragma GCC visibility in scope, and this isn't a class 5715 // member, set the visibility of this function. 5716 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5717 AddPushedVisibilityAttribute(NewFD); 5718 5719 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5720 // marking the function. 5721 AddCFAuditedAttribute(NewFD); 5722 5723 // If this is a locally-scoped extern C function, update the 5724 // map of such names. 5725 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5726 && !NewFD->isInvalidDecl()) 5727 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5728 5729 // Set this FunctionDecl's range up to the right paren. 5730 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5731 5732 if (getLangOpts().CPlusPlus) { 5733 if (FunctionTemplate) { 5734 if (NewFD->isInvalidDecl()) 5735 FunctionTemplate->setInvalidDecl(); 5736 return FunctionTemplate; 5737 } 5738 } 5739 5740 MarkUnusedFileScopedDecl(NewFD); 5741 5742 if (getLangOpts().CUDA) 5743 if (IdentifierInfo *II = NewFD->getIdentifier()) 5744 if (!NewFD->isInvalidDecl() && 5745 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5746 if (II->isStr("cudaConfigureCall")) { 5747 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5748 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5749 5750 Context.setcudaConfigureCallDecl(NewFD); 5751 } 5752 } 5753 5754 // Here we have an function template explicit specialization at class scope. 5755 // The actually specialization will be postponed to template instatiation 5756 // time via the ClassScopeFunctionSpecializationDecl node. 5757 if (isDependentClassScopeExplicitSpecialization) { 5758 ClassScopeFunctionSpecializationDecl *NewSpec = 5759 ClassScopeFunctionSpecializationDecl::Create( 5760 Context, CurContext, SourceLocation(), 5761 cast<CXXMethodDecl>(NewFD)); 5762 CurContext->addDecl(NewSpec); 5763 AddToScope = false; 5764 } 5765 5766 return NewFD; 5767} 5768 5769/// \brief Perform semantic checking of a new function declaration. 5770/// 5771/// Performs semantic analysis of the new function declaration 5772/// NewFD. This routine performs all semantic checking that does not 5773/// require the actual declarator involved in the declaration, and is 5774/// used both for the declaration of functions as they are parsed 5775/// (called via ActOnDeclarator) and for the declaration of functions 5776/// that have been instantiated via C++ template instantiation (called 5777/// via InstantiateDecl). 5778/// 5779/// \param IsExplicitSpecialiation whether this new function declaration is 5780/// an explicit specialization of the previous declaration. 5781/// 5782/// This sets NewFD->isInvalidDecl() to true if there was an error. 5783/// 5784/// Returns true if the function declaration is a redeclaration. 5785bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5786 LookupResult &Previous, 5787 bool IsExplicitSpecialization) { 5788 assert(!NewFD->getResultType()->isVariablyModifiedType() 5789 && "Variably modified return types are not handled here"); 5790 5791 // Check for a previous declaration of this name. 5792 if (Previous.empty() && NewFD->isExternC()) { 5793 // Since we did not find anything by this name and we're declaring 5794 // an extern "C" function, look for a non-visible extern "C" 5795 // declaration with the same name. 5796 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5797 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5798 if (Pos != LocallyScopedExternalDecls.end()) 5799 Previous.addDecl(Pos->second); 5800 } 5801 5802 bool Redeclaration = false; 5803 5804 // Merge or overload the declaration with an existing declaration of 5805 // the same name, if appropriate. 5806 if (!Previous.empty()) { 5807 // Determine whether NewFD is an overload of PrevDecl or 5808 // a declaration that requires merging. If it's an overload, 5809 // there's no more work to do here; we'll just add the new 5810 // function to the scope. 5811 5812 NamedDecl *OldDecl = 0; 5813 if (!AllowOverloadingOfFunction(Previous, Context)) { 5814 Redeclaration = true; 5815 OldDecl = Previous.getFoundDecl(); 5816 } else { 5817 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5818 /*NewIsUsingDecl*/ false)) { 5819 case Ovl_Match: 5820 Redeclaration = true; 5821 break; 5822 5823 case Ovl_NonFunction: 5824 Redeclaration = true; 5825 break; 5826 5827 case Ovl_Overload: 5828 Redeclaration = false; 5829 break; 5830 } 5831 5832 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5833 // If a function name is overloadable in C, then every function 5834 // with that name must be marked "overloadable". 5835 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5836 << Redeclaration << NewFD; 5837 NamedDecl *OverloadedDecl = 0; 5838 if (Redeclaration) 5839 OverloadedDecl = OldDecl; 5840 else if (!Previous.empty()) 5841 OverloadedDecl = Previous.getRepresentativeDecl(); 5842 if (OverloadedDecl) 5843 Diag(OverloadedDecl->getLocation(), 5844 diag::note_attribute_overloadable_prev_overload); 5845 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5846 Context)); 5847 } 5848 } 5849 5850 if (Redeclaration) { 5851 // NewFD and OldDecl represent declarations that need to be 5852 // merged. 5853 if (MergeFunctionDecl(NewFD, OldDecl, S)) { 5854 NewFD->setInvalidDecl(); 5855 return Redeclaration; 5856 } 5857 5858 Previous.clear(); 5859 Previous.addDecl(OldDecl); 5860 5861 if (FunctionTemplateDecl *OldTemplateDecl 5862 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5863 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5864 FunctionTemplateDecl *NewTemplateDecl 5865 = NewFD->getDescribedFunctionTemplate(); 5866 assert(NewTemplateDecl && "Template/non-template mismatch"); 5867 if (CXXMethodDecl *Method 5868 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5869 Method->setAccess(OldTemplateDecl->getAccess()); 5870 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5871 } 5872 5873 // If this is an explicit specialization of a member that is a function 5874 // template, mark it as a member specialization. 5875 if (IsExplicitSpecialization && 5876 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5877 NewTemplateDecl->setMemberSpecialization(); 5878 assert(OldTemplateDecl->isMemberSpecialization()); 5879 } 5880 5881 } else { 5882 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5883 NewFD->setAccess(OldDecl->getAccess()); 5884 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5885 } 5886 } 5887 } 5888 5889 // Semantic checking for this function declaration (in isolation). 5890 if (getLangOpts().CPlusPlus) { 5891 // C++-specific checks. 5892 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5893 CheckConstructor(Constructor); 5894 } else if (CXXDestructorDecl *Destructor = 5895 dyn_cast<CXXDestructorDecl>(NewFD)) { 5896 CXXRecordDecl *Record = Destructor->getParent(); 5897 QualType ClassType = Context.getTypeDeclType(Record); 5898 5899 // FIXME: Shouldn't we be able to perform this check even when the class 5900 // type is dependent? Both gcc and edg can handle that. 5901 if (!ClassType->isDependentType()) { 5902 DeclarationName Name 5903 = Context.DeclarationNames.getCXXDestructorName( 5904 Context.getCanonicalType(ClassType)); 5905 if (NewFD->getDeclName() != Name) { 5906 Diag(NewFD->getLocation(), diag::err_destructor_name); 5907 NewFD->setInvalidDecl(); 5908 return Redeclaration; 5909 } 5910 } 5911 } else if (CXXConversionDecl *Conversion 5912 = dyn_cast<CXXConversionDecl>(NewFD)) { 5913 ActOnConversionDeclarator(Conversion); 5914 } 5915 5916 // Find any virtual functions that this function overrides. 5917 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5918 if (!Method->isFunctionTemplateSpecialization() && 5919 !Method->getDescribedFunctionTemplate()) { 5920 if (AddOverriddenMethods(Method->getParent(), Method)) { 5921 // If the function was marked as "static", we have a problem. 5922 if (NewFD->getStorageClass() == SC_Static) { 5923 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5924 << NewFD->getDeclName(); 5925 for (CXXMethodDecl::method_iterator 5926 Overridden = Method->begin_overridden_methods(), 5927 OverriddenEnd = Method->end_overridden_methods(); 5928 Overridden != OverriddenEnd; 5929 ++Overridden) { 5930 Diag((*Overridden)->getLocation(), 5931 diag::note_overridden_virtual_function); 5932 } 5933 } 5934 } 5935 } 5936 5937 if (Method->isStatic()) 5938 checkThisInStaticMemberFunctionType(Method); 5939 } 5940 5941 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5942 if (NewFD->isOverloadedOperator() && 5943 CheckOverloadedOperatorDeclaration(NewFD)) { 5944 NewFD->setInvalidDecl(); 5945 return Redeclaration; 5946 } 5947 5948 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5949 if (NewFD->getLiteralIdentifier() && 5950 CheckLiteralOperatorDeclaration(NewFD)) { 5951 NewFD->setInvalidDecl(); 5952 return Redeclaration; 5953 } 5954 5955 // In C++, check default arguments now that we have merged decls. Unless 5956 // the lexical context is the class, because in this case this is done 5957 // during delayed parsing anyway. 5958 if (!CurContext->isRecord()) 5959 CheckCXXDefaultArguments(NewFD); 5960 5961 // If this function declares a builtin function, check the type of this 5962 // declaration against the expected type for the builtin. 5963 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5964 ASTContext::GetBuiltinTypeError Error; 5965 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5966 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5967 // The type of this function differs from the type of the builtin, 5968 // so forget about the builtin entirely. 5969 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5970 } 5971 } 5972 5973 // If this function is declared as being extern "C", then check to see if 5974 // the function returns a UDT (class, struct, or union type) that is not C 5975 // compatible, and if it does, warn the user. 5976 if (NewFD->isExternC()) { 5977 QualType R = NewFD->getResultType(); 5978 if (!R.isPODType(Context) && 5979 !R->isVoidType()) 5980 Diag( NewFD->getLocation(), diag::warn_return_value_udt ) 5981 << NewFD << R; 5982 } 5983 } 5984 return Redeclaration; 5985} 5986 5987void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5988 // C++11 [basic.start.main]p3: A program that declares main to be inline, 5989 // static or constexpr is ill-formed. 5990 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5991 // shall not appear in a declaration of main. 5992 // static main is not an error under C99, but we should warn about it. 5993 if (FD->getStorageClass() == SC_Static) 5994 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus 5995 ? diag::err_static_main : diag::warn_static_main) 5996 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5997 if (FD->isInlineSpecified()) 5998 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5999 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 6000 if (FD->isConstexpr()) { 6001 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 6002 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 6003 FD->setConstexpr(false); 6004 } 6005 6006 QualType T = FD->getType(); 6007 assert(T->isFunctionType() && "function decl is not of function type"); 6008 const FunctionType* FT = T->castAs<FunctionType>(); 6009 6010 // All the standards say that main() should should return 'int'. 6011 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 6012 // In C and C++, main magically returns 0 if you fall off the end; 6013 // set the flag which tells us that. 6014 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6015 FD->setHasImplicitReturnZero(true); 6016 6017 // In C with GNU extensions we allow main() to have non-integer return 6018 // type, but we should warn about the extension, and we disable the 6019 // implicit-return-zero rule. 6020 } else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) { 6021 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); 6022 6023 // Otherwise, this is just a flat-out error. 6024 } else { 6025 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 6026 FD->setInvalidDecl(true); 6027 } 6028 6029 // Treat protoless main() as nullary. 6030 if (isa<FunctionNoProtoType>(FT)) return; 6031 6032 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 6033 unsigned nparams = FTP->getNumArgs(); 6034 assert(FD->getNumParams() == nparams); 6035 6036 bool HasExtraParameters = (nparams > 3); 6037 6038 // Darwin passes an undocumented fourth argument of type char**. If 6039 // other platforms start sprouting these, the logic below will start 6040 // getting shifty. 6041 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 6042 HasExtraParameters = false; 6043 6044 if (HasExtraParameters) { 6045 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 6046 FD->setInvalidDecl(true); 6047 nparams = 3; 6048 } 6049 6050 // FIXME: a lot of the following diagnostics would be improved 6051 // if we had some location information about types. 6052 6053 QualType CharPP = 6054 Context.getPointerType(Context.getPointerType(Context.CharTy)); 6055 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 6056 6057 for (unsigned i = 0; i < nparams; ++i) { 6058 QualType AT = FTP->getArgType(i); 6059 6060 bool mismatch = true; 6061 6062 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 6063 mismatch = false; 6064 else if (Expected[i] == CharPP) { 6065 // As an extension, the following forms are okay: 6066 // char const ** 6067 // char const * const * 6068 // char * const * 6069 6070 QualifierCollector qs; 6071 const PointerType* PT; 6072 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 6073 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 6074 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 6075 qs.removeConst(); 6076 mismatch = !qs.empty(); 6077 } 6078 } 6079 6080 if (mismatch) { 6081 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 6082 // TODO: suggest replacing given type with expected type 6083 FD->setInvalidDecl(true); 6084 } 6085 } 6086 6087 if (nparams == 1 && !FD->isInvalidDecl()) { 6088 Diag(FD->getLocation(), diag::warn_main_one_arg); 6089 } 6090 6091 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 6092 Diag(FD->getLocation(), diag::err_main_template_decl); 6093 FD->setInvalidDecl(); 6094 } 6095} 6096 6097bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 6098 // FIXME: Need strict checking. In C89, we need to check for 6099 // any assignment, increment, decrement, function-calls, or 6100 // commas outside of a sizeof. In C99, it's the same list, 6101 // except that the aforementioned are allowed in unevaluated 6102 // expressions. Everything else falls under the 6103 // "may accept other forms of constant expressions" exception. 6104 // (We never end up here for C++, so the constant expression 6105 // rules there don't matter.) 6106 if (Init->isConstantInitializer(Context, false)) 6107 return false; 6108 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 6109 << Init->getSourceRange(); 6110 return true; 6111} 6112 6113namespace { 6114 // Visits an initialization expression to see if OrigDecl is evaluated in 6115 // its own initialization and throws a warning if it does. 6116 class SelfReferenceChecker 6117 : public EvaluatedExprVisitor<SelfReferenceChecker> { 6118 Sema &S; 6119 Decl *OrigDecl; 6120 bool isRecordType; 6121 bool isPODType; 6122 6123 public: 6124 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 6125 6126 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 6127 S(S), OrigDecl(OrigDecl) { 6128 isPODType = false; 6129 isRecordType = false; 6130 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 6131 isPODType = VD->getType().isPODType(S.Context); 6132 isRecordType = VD->getType()->isRecordType(); 6133 } 6134 } 6135 6136 // Sometimes, the expression passed in lacks the casts that are used 6137 // to determine which DeclRefExpr's to check. Assume that the casts 6138 // are present and continue visiting the expression. 6139 void HandleExpr(Expr *E) { 6140 // Skip checking T a = a where T is not a record type. Doing so is a 6141 // way to silence uninitialized warnings. 6142 if (isRecordType) 6143 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 6144 HandleDeclRefExpr(DRE); 6145 6146 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 6147 HandleValue(CO->getTrueExpr()); 6148 HandleValue(CO->getFalseExpr()); 6149 } 6150 6151 Visit(E); 6152 } 6153 6154 // For most expressions, the cast is directly above the DeclRefExpr. 6155 // For conditional operators, the cast can be outside the conditional 6156 // operator if both expressions are DeclRefExpr's. 6157 void HandleValue(Expr *E) { 6158 E = E->IgnoreParenImpCasts(); 6159 if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) { 6160 HandleDeclRefExpr(DRE); 6161 return; 6162 } 6163 6164 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 6165 HandleValue(CO->getTrueExpr()); 6166 HandleValue(CO->getFalseExpr()); 6167 } 6168 } 6169 6170 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 6171 if ((!isRecordType && E->getCastKind() == CK_LValueToRValue) || 6172 (isRecordType && E->getCastKind() == CK_NoOp)) 6173 HandleValue(E->getSubExpr()); 6174 6175 Inherited::VisitImplicitCastExpr(E); 6176 } 6177 6178 void VisitMemberExpr(MemberExpr *E) { 6179 // Don't warn on arrays since they can be treated as pointers. 6180 if (E->getType()->canDecayToPointerType()) return; 6181 6182 ValueDecl *VD = E->getMemberDecl(); 6183 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(VD); 6184 if (isa<FieldDecl>(VD) || (MD && !MD->isStatic())) 6185 if (DeclRefExpr *DRE 6186 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 6187 HandleDeclRefExpr(DRE); 6188 return; 6189 } 6190 6191 Inherited::VisitMemberExpr(E); 6192 } 6193 6194 void VisitUnaryOperator(UnaryOperator *E) { 6195 // For POD record types, addresses of its own members are well-defined. 6196 if (E->getOpcode() == UO_AddrOf && isRecordType && isPODType && 6197 isa<MemberExpr>(E->getSubExpr())) return; 6198 Inherited::VisitUnaryOperator(E); 6199 } 6200 6201 void VisitObjCMessageExpr(ObjCMessageExpr *E) { return; } 6202 6203 void HandleDeclRefExpr(DeclRefExpr *DRE) { 6204 Decl* ReferenceDecl = DRE->getDecl(); 6205 if (OrigDecl != ReferenceDecl) return; 6206 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 6207 Sema::NotForRedeclaration); 6208 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 6209 S.PDiag(diag::warn_uninit_self_reference_in_init) 6210 << Result.getLookupName() 6211 << OrigDecl->getLocation() 6212 << DRE->getSourceRange()); 6213 } 6214 }; 6215} 6216 6217/// CheckSelfReference - Warns if OrigDecl is used in expression E. 6218void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 6219 SelfReferenceChecker(*this, OrigDecl).HandleExpr(E); 6220} 6221 6222/// AddInitializerToDecl - Adds the initializer Init to the 6223/// declaration dcl. If DirectInit is true, this is C++ direct 6224/// initialization rather than copy initialization. 6225void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 6226 bool DirectInit, bool TypeMayContainAuto) { 6227 // If there is no declaration, there was an error parsing it. Just ignore 6228 // the initializer. 6229 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 6230 return; 6231 6232 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6233 // With declarators parsed the way they are, the parser cannot 6234 // distinguish between a normal initializer and a pure-specifier. 6235 // Thus this grotesque test. 6236 IntegerLiteral *IL; 6237 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6238 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6239 CheckPureMethod(Method, Init->getSourceRange()); 6240 else { 6241 Diag(Method->getLocation(), diag::err_member_function_initialization) 6242 << Method->getDeclName() << Init->getSourceRange(); 6243 Method->setInvalidDecl(); 6244 } 6245 return; 6246 } 6247 6248 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6249 if (!VDecl) { 6250 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6251 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6252 RealDecl->setInvalidDecl(); 6253 return; 6254 } 6255 6256 // Check for self-references within variable initializers. 6257 // Variables declared within a function/method body are handled 6258 // by a dataflow analysis. 6259 if (!VDecl->hasLocalStorage() && !VDecl->isStaticLocal()) 6260 CheckSelfReference(RealDecl, Init); 6261 6262 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); 6263 6264 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6265 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6266 Expr *DeduceInit = Init; 6267 // Initializer could be a C++ direct-initializer. Deduction only works if it 6268 // contains exactly one expression. 6269 if (CXXDirectInit) { 6270 if (CXXDirectInit->getNumExprs() == 0) { 6271 // It isn't possible to write this directly, but it is possible to 6272 // end up in this situation with "auto x(some_pack...);" 6273 Diag(CXXDirectInit->getLocStart(), 6274 diag::err_auto_var_init_no_expression) 6275 << VDecl->getDeclName() << VDecl->getType() 6276 << VDecl->getSourceRange(); 6277 RealDecl->setInvalidDecl(); 6278 return; 6279 } else if (CXXDirectInit->getNumExprs() > 1) { 6280 Diag(CXXDirectInit->getExpr(1)->getLocStart(), 6281 diag::err_auto_var_init_multiple_expressions) 6282 << VDecl->getDeclName() << VDecl->getType() 6283 << VDecl->getSourceRange(); 6284 RealDecl->setInvalidDecl(); 6285 return; 6286 } else { 6287 DeduceInit = CXXDirectInit->getExpr(0); 6288 } 6289 } 6290 TypeSourceInfo *DeducedType = 0; 6291 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) == 6292 DAR_Failed) 6293 DiagnoseAutoDeductionFailure(VDecl, DeduceInit); 6294 if (!DeducedType) { 6295 RealDecl->setInvalidDecl(); 6296 return; 6297 } 6298 VDecl->setTypeSourceInfo(DeducedType); 6299 VDecl->setType(DeducedType->getType()); 6300 VDecl->ClearLinkageCache(); 6301 6302 // In ARC, infer lifetime. 6303 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6304 VDecl->setInvalidDecl(); 6305 6306 // If this is a redeclaration, check that the type we just deduced matches 6307 // the previously declared type. 6308 if (VarDecl *Old = VDecl->getPreviousDecl()) 6309 MergeVarDeclTypes(VDecl, Old); 6310 } 6311 6312 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6313 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6314 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6315 VDecl->setInvalidDecl(); 6316 return; 6317 } 6318 6319 if (!VDecl->getType()->isDependentType()) { 6320 // A definition must end up with a complete type, which means it must be 6321 // complete with the restriction that an array type might be completed by 6322 // the initializer; note that later code assumes this restriction. 6323 QualType BaseDeclType = VDecl->getType(); 6324 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6325 BaseDeclType = Array->getElementType(); 6326 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6327 diag::err_typecheck_decl_incomplete_type)) { 6328 RealDecl->setInvalidDecl(); 6329 return; 6330 } 6331 6332 // The variable can not have an abstract class type. 6333 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6334 diag::err_abstract_type_in_decl, 6335 AbstractVariableType)) 6336 VDecl->setInvalidDecl(); 6337 } 6338 6339 const VarDecl *Def; 6340 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6341 Diag(VDecl->getLocation(), diag::err_redefinition) 6342 << VDecl->getDeclName(); 6343 Diag(Def->getLocation(), diag::note_previous_definition); 6344 VDecl->setInvalidDecl(); 6345 return; 6346 } 6347 6348 const VarDecl* PrevInit = 0; 6349 if (getLangOpts().CPlusPlus) { 6350 // C++ [class.static.data]p4 6351 // If a static data member is of const integral or const 6352 // enumeration type, its declaration in the class definition can 6353 // specify a constant-initializer which shall be an integral 6354 // constant expression (5.19). In that case, the member can appear 6355 // in integral constant expressions. The member shall still be 6356 // defined in a namespace scope if it is used in the program and the 6357 // namespace scope definition shall not contain an initializer. 6358 // 6359 // We already performed a redefinition check above, but for static 6360 // data members we also need to check whether there was an in-class 6361 // declaration with an initializer. 6362 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6363 Diag(VDecl->getLocation(), diag::err_redefinition) 6364 << VDecl->getDeclName(); 6365 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6366 return; 6367 } 6368 6369 if (VDecl->hasLocalStorage()) 6370 getCurFunction()->setHasBranchProtectedScope(); 6371 6372 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6373 VDecl->setInvalidDecl(); 6374 return; 6375 } 6376 } 6377 6378 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6379 // a kernel function cannot be initialized." 6380 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6381 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6382 VDecl->setInvalidDecl(); 6383 return; 6384 } 6385 6386 // Get the decls type and save a reference for later, since 6387 // CheckInitializerTypes may change it. 6388 QualType DclT = VDecl->getType(), SavT = DclT; 6389 6390 // Top-level message sends default to 'id' when we're in a debugger 6391 // and we are assigning it to a variable of 'id' type. 6392 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCIdType()) 6393 if (Init->getType() == Context.UnknownAnyTy && isa<ObjCMessageExpr>(Init)) { 6394 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); 6395 if (Result.isInvalid()) { 6396 VDecl->setInvalidDecl(); 6397 return; 6398 } 6399 Init = Result.take(); 6400 } 6401 6402 // Perform the initialization. 6403 if (!VDecl->isInvalidDecl()) { 6404 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6405 InitializationKind Kind 6406 = DirectInit ? 6407 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6408 Init->getLocStart(), 6409 Init->getLocEnd()) 6410 : InitializationKind::CreateDirectList( 6411 VDecl->getLocation()) 6412 : InitializationKind::CreateCopy(VDecl->getLocation(), 6413 Init->getLocStart()); 6414 6415 Expr **Args = &Init; 6416 unsigned NumArgs = 1; 6417 if (CXXDirectInit) { 6418 Args = CXXDirectInit->getExprs(); 6419 NumArgs = CXXDirectInit->getNumExprs(); 6420 } 6421 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs); 6422 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6423 MultiExprArg(*this, Args,NumArgs), 6424 &DclT); 6425 if (Result.isInvalid()) { 6426 VDecl->setInvalidDecl(); 6427 return; 6428 } 6429 6430 Init = Result.takeAs<Expr>(); 6431 } 6432 6433 // If the type changed, it means we had an incomplete type that was 6434 // completed by the initializer. For example: 6435 // int ary[] = { 1, 3, 5 }; 6436 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6437 if (!VDecl->isInvalidDecl() && (DclT != SavT)) 6438 VDecl->setType(DclT); 6439 6440 // Check any implicit conversions within the expression. 6441 CheckImplicitConversions(Init, VDecl->getLocation()); 6442 6443 if (!VDecl->isInvalidDecl()) 6444 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6445 6446 Init = MaybeCreateExprWithCleanups(Init); 6447 // Attach the initializer to the decl. 6448 VDecl->setInit(Init); 6449 6450 if (VDecl->isLocalVarDecl()) { 6451 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6452 // static storage duration shall be constant expressions or string literals. 6453 // C++ does not have this restriction. 6454 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() && 6455 VDecl->getStorageClass() == SC_Static) 6456 CheckForConstantInitializer(Init, DclT); 6457 } else if (VDecl->isStaticDataMember() && 6458 VDecl->getLexicalDeclContext()->isRecord()) { 6459 // This is an in-class initialization for a static data member, e.g., 6460 // 6461 // struct S { 6462 // static const int value = 17; 6463 // }; 6464 6465 // C++ [class.mem]p4: 6466 // A member-declarator can contain a constant-initializer only 6467 // if it declares a static member (9.4) of const integral or 6468 // const enumeration type, see 9.4.2. 6469 // 6470 // C++11 [class.static.data]p3: 6471 // If a non-volatile const static data member is of integral or 6472 // enumeration type, its declaration in the class definition can 6473 // specify a brace-or-equal-initializer in which every initalizer-clause 6474 // that is an assignment-expression is a constant expression. A static 6475 // data member of literal type can be declared in the class definition 6476 // with the constexpr specifier; if so, its declaration shall specify a 6477 // brace-or-equal-initializer in which every initializer-clause that is 6478 // an assignment-expression is a constant expression. 6479 6480 // Do nothing on dependent types. 6481 if (DclT->isDependentType()) { 6482 6483 // Allow any 'static constexpr' members, whether or not they are of literal 6484 // type. We separately check that every constexpr variable is of literal 6485 // type. 6486 } else if (VDecl->isConstexpr()) { 6487 6488 // Require constness. 6489 } else if (!DclT.isConstQualified()) { 6490 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6491 << Init->getSourceRange(); 6492 VDecl->setInvalidDecl(); 6493 6494 // We allow integer constant expressions in all cases. 6495 } else if (DclT->isIntegralOrEnumerationType()) { 6496 // Check whether the expression is a constant expression. 6497 SourceLocation Loc; 6498 if (getLangOpts().CPlusPlus0x && DclT.isVolatileQualified()) 6499 // In C++11, a non-constexpr const static data member with an 6500 // in-class initializer cannot be volatile. 6501 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6502 else if (Init->isValueDependent()) 6503 ; // Nothing to check. 6504 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6505 ; // Ok, it's an ICE! 6506 else if (Init->isEvaluatable(Context)) { 6507 // If we can constant fold the initializer through heroics, accept it, 6508 // but report this as a use of an extension for -pedantic. 6509 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6510 << Init->getSourceRange(); 6511 } else { 6512 // Otherwise, this is some crazy unknown case. Report the issue at the 6513 // location provided by the isIntegerConstantExpr failed check. 6514 Diag(Loc, diag::err_in_class_initializer_non_constant) 6515 << Init->getSourceRange(); 6516 VDecl->setInvalidDecl(); 6517 } 6518 6519 // We allow foldable floating-point constants as an extension. 6520 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6521 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6522 << DclT << Init->getSourceRange(); 6523 if (getLangOpts().CPlusPlus0x) 6524 Diag(VDecl->getLocation(), 6525 diag::note_in_class_initializer_float_type_constexpr) 6526 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6527 6528 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6529 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6530 << Init->getSourceRange(); 6531 VDecl->setInvalidDecl(); 6532 } 6533 6534 // Suggest adding 'constexpr' in C++11 for literal types. 6535 } else if (getLangOpts().CPlusPlus0x && DclT->isLiteralType()) { 6536 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6537 << DclT << Init->getSourceRange() 6538 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6539 VDecl->setConstexpr(true); 6540 6541 } else { 6542 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6543 << DclT << Init->getSourceRange(); 6544 VDecl->setInvalidDecl(); 6545 } 6546 } else if (VDecl->isFileVarDecl()) { 6547 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6548 (!getLangOpts().CPlusPlus || 6549 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6550 Diag(VDecl->getLocation(), diag::warn_extern_init); 6551 6552 // C99 6.7.8p4. All file scoped initializers need to be constant. 6553 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) 6554 CheckForConstantInitializer(Init, DclT); 6555 } 6556 6557 // We will represent direct-initialization similarly to copy-initialization: 6558 // int x(1); -as-> int x = 1; 6559 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6560 // 6561 // Clients that want to distinguish between the two forms, can check for 6562 // direct initializer using VarDecl::getInitStyle(). 6563 // A major benefit is that clients that don't particularly care about which 6564 // exactly form was it (like the CodeGen) can handle both cases without 6565 // special case code. 6566 6567 // C++ 8.5p11: 6568 // The form of initialization (using parentheses or '=') is generally 6569 // insignificant, but does matter when the entity being initialized has a 6570 // class type. 6571 if (CXXDirectInit) { 6572 assert(DirectInit && "Call-style initializer must be direct init."); 6573 VDecl->setInitStyle(VarDecl::CallInit); 6574 } else if (DirectInit) { 6575 // This must be list-initialization. No other way is direct-initialization. 6576 VDecl->setInitStyle(VarDecl::ListInit); 6577 } 6578 6579 CheckCompleteVariableDeclaration(VDecl); 6580} 6581 6582/// ActOnInitializerError - Given that there was an error parsing an 6583/// initializer for the given declaration, try to return to some form 6584/// of sanity. 6585void Sema::ActOnInitializerError(Decl *D) { 6586 // Our main concern here is re-establishing invariants like "a 6587 // variable's type is either dependent or complete". 6588 if (!D || D->isInvalidDecl()) return; 6589 6590 VarDecl *VD = dyn_cast<VarDecl>(D); 6591 if (!VD) return; 6592 6593 // Auto types are meaningless if we can't make sense of the initializer. 6594 if (ParsingInitForAutoVars.count(D)) { 6595 D->setInvalidDecl(); 6596 return; 6597 } 6598 6599 QualType Ty = VD->getType(); 6600 if (Ty->isDependentType()) return; 6601 6602 // Require a complete type. 6603 if (RequireCompleteType(VD->getLocation(), 6604 Context.getBaseElementType(Ty), 6605 diag::err_typecheck_decl_incomplete_type)) { 6606 VD->setInvalidDecl(); 6607 return; 6608 } 6609 6610 // Require an abstract type. 6611 if (RequireNonAbstractType(VD->getLocation(), Ty, 6612 diag::err_abstract_type_in_decl, 6613 AbstractVariableType)) { 6614 VD->setInvalidDecl(); 6615 return; 6616 } 6617 6618 // Don't bother complaining about constructors or destructors, 6619 // though. 6620} 6621 6622void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6623 bool TypeMayContainAuto) { 6624 // If there is no declaration, there was an error parsing it. Just ignore it. 6625 if (RealDecl == 0) 6626 return; 6627 6628 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6629 QualType Type = Var->getType(); 6630 6631 // C++11 [dcl.spec.auto]p3 6632 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6633 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6634 << Var->getDeclName() << Type; 6635 Var->setInvalidDecl(); 6636 return; 6637 } 6638 6639 // C++11 [class.static.data]p3: A static data member can be declared with 6640 // the constexpr specifier; if so, its declaration shall specify 6641 // a brace-or-equal-initializer. 6642 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6643 // the definition of a variable [...] or the declaration of a static data 6644 // member. 6645 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6646 if (Var->isStaticDataMember()) 6647 Diag(Var->getLocation(), 6648 diag::err_constexpr_static_mem_var_requires_init) 6649 << Var->getDeclName(); 6650 else 6651 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6652 Var->setInvalidDecl(); 6653 return; 6654 } 6655 6656 switch (Var->isThisDeclarationADefinition()) { 6657 case VarDecl::Definition: 6658 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6659 break; 6660 6661 // We have an out-of-line definition of a static data member 6662 // that has an in-class initializer, so we type-check this like 6663 // a declaration. 6664 // 6665 // Fall through 6666 6667 case VarDecl::DeclarationOnly: 6668 // It's only a declaration. 6669 6670 // Block scope. C99 6.7p7: If an identifier for an object is 6671 // declared with no linkage (C99 6.2.2p6), the type for the 6672 // object shall be complete. 6673 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6674 !Var->getLinkage() && !Var->isInvalidDecl() && 6675 RequireCompleteType(Var->getLocation(), Type, 6676 diag::err_typecheck_decl_incomplete_type)) 6677 Var->setInvalidDecl(); 6678 6679 // Make sure that the type is not abstract. 6680 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6681 RequireNonAbstractType(Var->getLocation(), Type, 6682 diag::err_abstract_type_in_decl, 6683 AbstractVariableType)) 6684 Var->setInvalidDecl(); 6685 return; 6686 6687 case VarDecl::TentativeDefinition: 6688 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6689 // object that has file scope without an initializer, and without a 6690 // storage-class specifier or with the storage-class specifier "static", 6691 // constitutes a tentative definition. Note: A tentative definition with 6692 // external linkage is valid (C99 6.2.2p5). 6693 if (!Var->isInvalidDecl()) { 6694 if (const IncompleteArrayType *ArrayT 6695 = Context.getAsIncompleteArrayType(Type)) { 6696 if (RequireCompleteType(Var->getLocation(), 6697 ArrayT->getElementType(), 6698 diag::err_illegal_decl_array_incomplete_type)) 6699 Var->setInvalidDecl(); 6700 } else if (Var->getStorageClass() == SC_Static) { 6701 // C99 6.9.2p3: If the declaration of an identifier for an object is 6702 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6703 // declared type shall not be an incomplete type. 6704 // NOTE: code such as the following 6705 // static struct s; 6706 // struct s { int a; }; 6707 // is accepted by gcc. Hence here we issue a warning instead of 6708 // an error and we do not invalidate the static declaration. 6709 // NOTE: to avoid multiple warnings, only check the first declaration. 6710 if (Var->getPreviousDecl() == 0) 6711 RequireCompleteType(Var->getLocation(), Type, 6712 diag::ext_typecheck_decl_incomplete_type); 6713 } 6714 } 6715 6716 // Record the tentative definition; we're done. 6717 if (!Var->isInvalidDecl()) 6718 TentativeDefinitions.push_back(Var); 6719 return; 6720 } 6721 6722 // Provide a specific diagnostic for uninitialized variable 6723 // definitions with incomplete array type. 6724 if (Type->isIncompleteArrayType()) { 6725 Diag(Var->getLocation(), 6726 diag::err_typecheck_incomplete_array_needs_initializer); 6727 Var->setInvalidDecl(); 6728 return; 6729 } 6730 6731 // Provide a specific diagnostic for uninitialized variable 6732 // definitions with reference type. 6733 if (Type->isReferenceType()) { 6734 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6735 << Var->getDeclName() 6736 << SourceRange(Var->getLocation(), Var->getLocation()); 6737 Var->setInvalidDecl(); 6738 return; 6739 } 6740 6741 // Do not attempt to type-check the default initializer for a 6742 // variable with dependent type. 6743 if (Type->isDependentType()) 6744 return; 6745 6746 if (Var->isInvalidDecl()) 6747 return; 6748 6749 if (RequireCompleteType(Var->getLocation(), 6750 Context.getBaseElementType(Type), 6751 diag::err_typecheck_decl_incomplete_type)) { 6752 Var->setInvalidDecl(); 6753 return; 6754 } 6755 6756 // The variable can not have an abstract class type. 6757 if (RequireNonAbstractType(Var->getLocation(), Type, 6758 diag::err_abstract_type_in_decl, 6759 AbstractVariableType)) { 6760 Var->setInvalidDecl(); 6761 return; 6762 } 6763 6764 // Check for jumps past the implicit initializer. C++0x 6765 // clarifies that this applies to a "variable with automatic 6766 // storage duration", not a "local variable". 6767 // C++11 [stmt.dcl]p3 6768 // A program that jumps from a point where a variable with automatic 6769 // storage duration is not in scope to a point where it is in scope is 6770 // ill-formed unless the variable has scalar type, class type with a 6771 // trivial default constructor and a trivial destructor, a cv-qualified 6772 // version of one of these types, or an array of one of the preceding 6773 // types and is declared without an initializer. 6774 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) { 6775 if (const RecordType *Record 6776 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6777 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6778 // Mark the function for further checking even if the looser rules of 6779 // C++11 do not require such checks, so that we can diagnose 6780 // incompatibilities with C++98. 6781 if (!CXXRecord->isPOD()) 6782 getCurFunction()->setHasBranchProtectedScope(); 6783 } 6784 } 6785 6786 // C++03 [dcl.init]p9: 6787 // If no initializer is specified for an object, and the 6788 // object is of (possibly cv-qualified) non-POD class type (or 6789 // array thereof), the object shall be default-initialized; if 6790 // the object is of const-qualified type, the underlying class 6791 // type shall have a user-declared default 6792 // constructor. Otherwise, if no initializer is specified for 6793 // a non- static object, the object and its subobjects, if 6794 // any, have an indeterminate initial value); if the object 6795 // or any of its subobjects are of const-qualified type, the 6796 // program is ill-formed. 6797 // C++0x [dcl.init]p11: 6798 // If no initializer is specified for an object, the object is 6799 // default-initialized; [...]. 6800 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6801 InitializationKind Kind 6802 = InitializationKind::CreateDefault(Var->getLocation()); 6803 6804 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6805 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6806 MultiExprArg(*this, 0, 0)); 6807 if (Init.isInvalid()) 6808 Var->setInvalidDecl(); 6809 else if (Init.get()) { 6810 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6811 // This is important for template substitution. 6812 Var->setInitStyle(VarDecl::CallInit); 6813 } 6814 6815 CheckCompleteVariableDeclaration(Var); 6816 } 6817} 6818 6819void Sema::ActOnCXXForRangeDecl(Decl *D) { 6820 VarDecl *VD = dyn_cast<VarDecl>(D); 6821 if (!VD) { 6822 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6823 D->setInvalidDecl(); 6824 return; 6825 } 6826 6827 VD->setCXXForRangeDecl(true); 6828 6829 // for-range-declaration cannot be given a storage class specifier. 6830 int Error = -1; 6831 switch (VD->getStorageClassAsWritten()) { 6832 case SC_None: 6833 break; 6834 case SC_Extern: 6835 Error = 0; 6836 break; 6837 case SC_Static: 6838 Error = 1; 6839 break; 6840 case SC_PrivateExtern: 6841 Error = 2; 6842 break; 6843 case SC_Auto: 6844 Error = 3; 6845 break; 6846 case SC_Register: 6847 Error = 4; 6848 break; 6849 case SC_OpenCLWorkGroupLocal: 6850 llvm_unreachable("Unexpected storage class"); 6851 } 6852 if (VD->isConstexpr()) 6853 Error = 5; 6854 if (Error != -1) { 6855 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6856 << VD->getDeclName() << Error; 6857 D->setInvalidDecl(); 6858 } 6859} 6860 6861void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6862 if (var->isInvalidDecl()) return; 6863 6864 // In ARC, don't allow jumps past the implicit initialization of a 6865 // local retaining variable. 6866 if (getLangOpts().ObjCAutoRefCount && 6867 var->hasLocalStorage()) { 6868 switch (var->getType().getObjCLifetime()) { 6869 case Qualifiers::OCL_None: 6870 case Qualifiers::OCL_ExplicitNone: 6871 case Qualifiers::OCL_Autoreleasing: 6872 break; 6873 6874 case Qualifiers::OCL_Weak: 6875 case Qualifiers::OCL_Strong: 6876 getCurFunction()->setHasBranchProtectedScope(); 6877 break; 6878 } 6879 } 6880 6881 // All the following checks are C++ only. 6882 if (!getLangOpts().CPlusPlus) return; 6883 6884 QualType baseType = Context.getBaseElementType(var->getType()); 6885 if (baseType->isDependentType()) return; 6886 6887 // __block variables might require us to capture a copy-initializer. 6888 if (var->hasAttr<BlocksAttr>()) { 6889 // It's currently invalid to ever have a __block variable with an 6890 // array type; should we diagnose that here? 6891 6892 // Regardless, we don't want to ignore array nesting when 6893 // constructing this copy. 6894 QualType type = var->getType(); 6895 6896 if (type->isStructureOrClassType()) { 6897 SourceLocation poi = var->getLocation(); 6898 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi); 6899 ExprResult result = 6900 PerformCopyInitialization( 6901 InitializedEntity::InitializeBlock(poi, type, false), 6902 poi, Owned(varRef)); 6903 if (!result.isInvalid()) { 6904 result = MaybeCreateExprWithCleanups(result); 6905 Expr *init = result.takeAs<Expr>(); 6906 Context.setBlockVarCopyInits(var, init); 6907 } 6908 } 6909 } 6910 6911 Expr *Init = var->getInit(); 6912 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6913 6914 if (!var->getDeclContext()->isDependentContext() && Init) { 6915 if (IsGlobal && !var->isConstexpr() && 6916 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6917 var->getLocation()) 6918 != DiagnosticsEngine::Ignored && 6919 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6920 Diag(var->getLocation(), diag::warn_global_constructor) 6921 << Init->getSourceRange(); 6922 6923 if (var->isConstexpr()) { 6924 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6925 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6926 SourceLocation DiagLoc = var->getLocation(); 6927 // If the note doesn't add any useful information other than a source 6928 // location, fold it into the primary diagnostic. 6929 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6930 diag::note_invalid_subexpr_in_const_expr) { 6931 DiagLoc = Notes[0].first; 6932 Notes.clear(); 6933 } 6934 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6935 << var << Init->getSourceRange(); 6936 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6937 Diag(Notes[I].first, Notes[I].second); 6938 } 6939 } else if (var->isUsableInConstantExpressions(Context)) { 6940 // Check whether the initializer of a const variable of integral or 6941 // enumeration type is an ICE now, since we can't tell whether it was 6942 // initialized by a constant expression if we check later. 6943 var->checkInitIsICE(); 6944 } 6945 } 6946 6947 // Require the destructor. 6948 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6949 FinalizeVarWithDestructor(var, recordType); 6950} 6951 6952/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6953/// any semantic actions necessary after any initializer has been attached. 6954void 6955Sema::FinalizeDeclaration(Decl *ThisDecl) { 6956 // Note that we are no longer parsing the initializer for this declaration. 6957 ParsingInitForAutoVars.erase(ThisDecl); 6958} 6959 6960Sema::DeclGroupPtrTy 6961Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6962 Decl **Group, unsigned NumDecls) { 6963 SmallVector<Decl*, 8> Decls; 6964 6965 if (DS.isTypeSpecOwned()) 6966 Decls.push_back(DS.getRepAsDecl()); 6967 6968 for (unsigned i = 0; i != NumDecls; ++i) 6969 if (Decl *D = Group[i]) 6970 Decls.push_back(D); 6971 6972 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6973 DS.getTypeSpecType() == DeclSpec::TST_auto); 6974} 6975 6976/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6977/// group, performing any necessary semantic checking. 6978Sema::DeclGroupPtrTy 6979Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6980 bool TypeMayContainAuto) { 6981 // C++0x [dcl.spec.auto]p7: 6982 // If the type deduced for the template parameter U is not the same in each 6983 // deduction, the program is ill-formed. 6984 // FIXME: When initializer-list support is added, a distinction is needed 6985 // between the deduced type U and the deduced type which 'auto' stands for. 6986 // auto a = 0, b = { 1, 2, 3 }; 6987 // is legal because the deduced type U is 'int' in both cases. 6988 if (TypeMayContainAuto && NumDecls > 1) { 6989 QualType Deduced; 6990 CanQualType DeducedCanon; 6991 VarDecl *DeducedDecl = 0; 6992 for (unsigned i = 0; i != NumDecls; ++i) { 6993 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6994 AutoType *AT = D->getType()->getContainedAutoType(); 6995 // Don't reissue diagnostics when instantiating a template. 6996 if (AT && D->isInvalidDecl()) 6997 break; 6998 if (AT && AT->isDeduced()) { 6999 QualType U = AT->getDeducedType(); 7000 CanQualType UCanon = Context.getCanonicalType(U); 7001 if (Deduced.isNull()) { 7002 Deduced = U; 7003 DeducedCanon = UCanon; 7004 DeducedDecl = D; 7005 } else if (DeducedCanon != UCanon) { 7006 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 7007 diag::err_auto_different_deductions) 7008 << Deduced << DeducedDecl->getDeclName() 7009 << U << D->getDeclName() 7010 << DeducedDecl->getInit()->getSourceRange() 7011 << D->getInit()->getSourceRange(); 7012 D->setInvalidDecl(); 7013 break; 7014 } 7015 } 7016 } 7017 } 7018 } 7019 7020 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 7021} 7022 7023 7024/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 7025/// to introduce parameters into function prototype scope. 7026Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 7027 const DeclSpec &DS = D.getDeclSpec(); 7028 7029 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 7030 // C++03 [dcl.stc]p2 also permits 'auto'. 7031 VarDecl::StorageClass StorageClass = SC_None; 7032 VarDecl::StorageClass StorageClassAsWritten = SC_None; 7033 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 7034 StorageClass = SC_Register; 7035 StorageClassAsWritten = SC_Register; 7036 } else if (getLangOpts().CPlusPlus && 7037 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 7038 StorageClass = SC_Auto; 7039 StorageClassAsWritten = SC_Auto; 7040 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 7041 Diag(DS.getStorageClassSpecLoc(), 7042 diag::err_invalid_storage_class_in_func_decl); 7043 D.getMutableDeclSpec().ClearStorageClassSpecs(); 7044 } 7045 7046 if (D.getDeclSpec().isThreadSpecified()) 7047 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7048 if (D.getDeclSpec().isConstexprSpecified()) 7049 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 7050 << 0; 7051 7052 DiagnoseFunctionSpecifiers(D); 7053 7054 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7055 QualType parmDeclType = TInfo->getType(); 7056 7057 if (getLangOpts().CPlusPlus) { 7058 // Check that there are no default arguments inside the type of this 7059 // parameter. 7060 CheckExtraCXXDefaultArguments(D); 7061 7062 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 7063 if (D.getCXXScopeSpec().isSet()) { 7064 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 7065 << D.getCXXScopeSpec().getRange(); 7066 D.getCXXScopeSpec().clear(); 7067 } 7068 } 7069 7070 // Ensure we have a valid name 7071 IdentifierInfo *II = 0; 7072 if (D.hasName()) { 7073 II = D.getIdentifier(); 7074 if (!II) { 7075 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 7076 << GetNameForDeclarator(D).getName().getAsString(); 7077 D.setInvalidType(true); 7078 } 7079 } 7080 7081 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 7082 if (II) { 7083 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 7084 ForRedeclaration); 7085 LookupName(R, S); 7086 if (R.isSingleResult()) { 7087 NamedDecl *PrevDecl = R.getFoundDecl(); 7088 if (PrevDecl->isTemplateParameter()) { 7089 // Maybe we will complain about the shadowed template parameter. 7090 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7091 // Just pretend that we didn't see the previous declaration. 7092 PrevDecl = 0; 7093 } else if (S->isDeclScope(PrevDecl)) { 7094 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 7095 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7096 7097 // Recover by removing the name 7098 II = 0; 7099 D.SetIdentifier(0, D.getIdentifierLoc()); 7100 D.setInvalidType(true); 7101 } 7102 } 7103 } 7104 7105 // Temporarily put parameter variables in the translation unit, not 7106 // the enclosing context. This prevents them from accidentally 7107 // looking like class members in C++. 7108 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 7109 D.getLocStart(), 7110 D.getIdentifierLoc(), II, 7111 parmDeclType, TInfo, 7112 StorageClass, StorageClassAsWritten); 7113 7114 if (D.isInvalidType()) 7115 New->setInvalidDecl(); 7116 7117 assert(S->isFunctionPrototypeScope()); 7118 assert(S->getFunctionPrototypeDepth() >= 1); 7119 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 7120 S->getNextFunctionPrototypeIndex()); 7121 7122 // Add the parameter declaration into this scope. 7123 S->AddDecl(New); 7124 if (II) 7125 IdResolver.AddDecl(New); 7126 7127 ProcessDeclAttributes(S, New, D); 7128 7129 if (D.getDeclSpec().isModulePrivateSpecified()) 7130 Diag(New->getLocation(), diag::err_module_private_local) 7131 << 1 << New->getDeclName() 7132 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7133 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7134 7135 if (New->hasAttr<BlocksAttr>()) { 7136 Diag(New->getLocation(), diag::err_block_on_nonlocal); 7137 } 7138 return New; 7139} 7140 7141/// \brief Synthesizes a variable for a parameter arising from a 7142/// typedef. 7143ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 7144 SourceLocation Loc, 7145 QualType T) { 7146 /* FIXME: setting StartLoc == Loc. 7147 Would it be worth to modify callers so as to provide proper source 7148 location for the unnamed parameters, embedding the parameter's type? */ 7149 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 7150 T, Context.getTrivialTypeSourceInfo(T, Loc), 7151 SC_None, SC_None, 0); 7152 Param->setImplicit(); 7153 return Param; 7154} 7155 7156void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 7157 ParmVarDecl * const *ParamEnd) { 7158 // Don't diagnose unused-parameter errors in template instantiations; we 7159 // will already have done so in the template itself. 7160 if (!ActiveTemplateInstantiations.empty()) 7161 return; 7162 7163 for (; Param != ParamEnd; ++Param) { 7164 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 7165 !(*Param)->hasAttr<UnusedAttr>()) { 7166 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 7167 << (*Param)->getDeclName(); 7168 } 7169 } 7170} 7171 7172void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 7173 ParmVarDecl * const *ParamEnd, 7174 QualType ReturnTy, 7175 NamedDecl *D) { 7176 if (LangOpts.NumLargeByValueCopy == 0) // No check. 7177 return; 7178 7179 // Warn if the return value is pass-by-value and larger than the specified 7180 // threshold. 7181 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 7182 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 7183 if (Size > LangOpts.NumLargeByValueCopy) 7184 Diag(D->getLocation(), diag::warn_return_value_size) 7185 << D->getDeclName() << Size; 7186 } 7187 7188 // Warn if any parameter is pass-by-value and larger than the specified 7189 // threshold. 7190 for (; Param != ParamEnd; ++Param) { 7191 QualType T = (*Param)->getType(); 7192 if (T->isDependentType() || !T.isPODType(Context)) 7193 continue; 7194 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 7195 if (Size > LangOpts.NumLargeByValueCopy) 7196 Diag((*Param)->getLocation(), diag::warn_parameter_size) 7197 << (*Param)->getDeclName() << Size; 7198 } 7199} 7200 7201ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 7202 SourceLocation NameLoc, IdentifierInfo *Name, 7203 QualType T, TypeSourceInfo *TSInfo, 7204 VarDecl::StorageClass StorageClass, 7205 VarDecl::StorageClass StorageClassAsWritten) { 7206 // In ARC, infer a lifetime qualifier for appropriate parameter types. 7207 if (getLangOpts().ObjCAutoRefCount && 7208 T.getObjCLifetime() == Qualifiers::OCL_None && 7209 T->isObjCLifetimeType()) { 7210 7211 Qualifiers::ObjCLifetime lifetime; 7212 7213 // Special cases for arrays: 7214 // - if it's const, use __unsafe_unretained 7215 // - otherwise, it's an error 7216 if (T->isArrayType()) { 7217 if (!T.isConstQualified()) { 7218 DelayedDiagnostics.add( 7219 sema::DelayedDiagnostic::makeForbiddenType( 7220 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 7221 } 7222 lifetime = Qualifiers::OCL_ExplicitNone; 7223 } else { 7224 lifetime = T->getObjCARCImplicitLifetime(); 7225 } 7226 T = Context.getLifetimeQualifiedType(T, lifetime); 7227 } 7228 7229 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 7230 Context.getAdjustedParameterType(T), 7231 TSInfo, 7232 StorageClass, StorageClassAsWritten, 7233 0); 7234 7235 // Parameters can not be abstract class types. 7236 // For record types, this is done by the AbstractClassUsageDiagnoser once 7237 // the class has been completely parsed. 7238 if (!CurContext->isRecord() && 7239 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 7240 AbstractParamType)) 7241 New->setInvalidDecl(); 7242 7243 // Parameter declarators cannot be interface types. All ObjC objects are 7244 // passed by reference. 7245 if (T->isObjCObjectType()) { 7246 SourceLocation TypeEndLoc = TSInfo->getTypeLoc().getLocEnd(); 7247 Diag(NameLoc, 7248 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 7249 << FixItHint::CreateInsertion(TypeEndLoc, "*"); 7250 T = Context.getObjCObjectPointerType(T); 7251 New->setType(T); 7252 } 7253 7254 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 7255 // duration shall not be qualified by an address-space qualifier." 7256 // Since all parameters have automatic store duration, they can not have 7257 // an address space. 7258 if (T.getAddressSpace() != 0) { 7259 Diag(NameLoc, diag::err_arg_with_address_space); 7260 New->setInvalidDecl(); 7261 } 7262 7263 return New; 7264} 7265 7266void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 7267 SourceLocation LocAfterDecls) { 7268 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 7269 7270 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 7271 // for a K&R function. 7272 if (!FTI.hasPrototype) { 7273 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 7274 --i; 7275 if (FTI.ArgInfo[i].Param == 0) { 7276 SmallString<256> Code; 7277 llvm::raw_svector_ostream(Code) << " int " 7278 << FTI.ArgInfo[i].Ident->getName() 7279 << ";\n"; 7280 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 7281 << FTI.ArgInfo[i].Ident 7282 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 7283 7284 // Implicitly declare the argument as type 'int' for lack of a better 7285 // type. 7286 AttributeFactory attrs; 7287 DeclSpec DS(attrs); 7288 const char* PrevSpec; // unused 7289 unsigned DiagID; // unused 7290 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 7291 PrevSpec, DiagID); 7292 Declarator ParamD(DS, Declarator::KNRTypeListContext); 7293 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 7294 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 7295 } 7296 } 7297 } 7298} 7299 7300Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 7301 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 7302 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 7303 Scope *ParentScope = FnBodyScope->getParent(); 7304 7305 D.setFunctionDefinitionKind(FDK_Definition); 7306 Decl *DP = HandleDeclarator(ParentScope, D, 7307 MultiTemplateParamsArg(*this)); 7308 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7309} 7310 7311static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7312 // Don't warn about invalid declarations. 7313 if (FD->isInvalidDecl()) 7314 return false; 7315 7316 // Or declarations that aren't global. 7317 if (!FD->isGlobal()) 7318 return false; 7319 7320 // Don't warn about C++ member functions. 7321 if (isa<CXXMethodDecl>(FD)) 7322 return false; 7323 7324 // Don't warn about 'main'. 7325 if (FD->isMain()) 7326 return false; 7327 7328 // Don't warn about inline functions. 7329 if (FD->isInlined()) 7330 return false; 7331 7332 // Don't warn about function templates. 7333 if (FD->getDescribedFunctionTemplate()) 7334 return false; 7335 7336 // Don't warn about function template specializations. 7337 if (FD->isFunctionTemplateSpecialization()) 7338 return false; 7339 7340 bool MissingPrototype = true; 7341 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7342 Prev; Prev = Prev->getPreviousDecl()) { 7343 // Ignore any declarations that occur in function or method 7344 // scope, because they aren't visible from the header. 7345 if (Prev->getDeclContext()->isFunctionOrMethod()) 7346 continue; 7347 7348 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7349 break; 7350 } 7351 7352 return MissingPrototype; 7353} 7354 7355void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7356 // Don't complain if we're in GNU89 mode and the previous definition 7357 // was an extern inline function. 7358 const FunctionDecl *Definition; 7359 if (FD->isDefined(Definition) && 7360 !canRedefineFunction(Definition, getLangOpts())) { 7361 if (getLangOpts().GNUMode && Definition->isInlineSpecified() && 7362 Definition->getStorageClass() == SC_Extern) 7363 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7364 << FD->getDeclName() << getLangOpts().CPlusPlus; 7365 else 7366 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7367 Diag(Definition->getLocation(), diag::note_previous_definition); 7368 } 7369} 7370 7371Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7372 // Clear the last template instantiation error context. 7373 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7374 7375 if (!D) 7376 return D; 7377 FunctionDecl *FD = 0; 7378 7379 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7380 FD = FunTmpl->getTemplatedDecl(); 7381 else 7382 FD = cast<FunctionDecl>(D); 7383 7384 // Enter a new function scope 7385 PushFunctionScope(); 7386 7387 // See if this is a redefinition. 7388 if (!FD->isLateTemplateParsed()) 7389 CheckForFunctionRedefinition(FD); 7390 7391 // Builtin functions cannot be defined. 7392 if (unsigned BuiltinID = FD->getBuiltinID()) { 7393 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7394 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7395 FD->setInvalidDecl(); 7396 } 7397 } 7398 7399 // The return type of a function definition must be complete 7400 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7401 QualType ResultType = FD->getResultType(); 7402 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7403 !FD->isInvalidDecl() && 7404 RequireCompleteType(FD->getLocation(), ResultType, 7405 diag::err_func_def_incomplete_result)) 7406 FD->setInvalidDecl(); 7407 7408 // GNU warning -Wmissing-prototypes: 7409 // Warn if a global function is defined without a previous 7410 // prototype declaration. This warning is issued even if the 7411 // definition itself provides a prototype. The aim is to detect 7412 // global functions that fail to be declared in header files. 7413 if (ShouldWarnAboutMissingPrototype(FD)) 7414 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7415 7416 if (FnBodyScope) 7417 PushDeclContext(FnBodyScope, FD); 7418 7419 // Check the validity of our function parameters 7420 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7421 /*CheckParameterNames=*/true); 7422 7423 // Introduce our parameters into the function scope 7424 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7425 ParmVarDecl *Param = FD->getParamDecl(p); 7426 Param->setOwningFunction(FD); 7427 7428 // If this has an identifier, add it to the scope stack. 7429 if (Param->getIdentifier() && FnBodyScope) { 7430 CheckShadow(FnBodyScope, Param); 7431 7432 PushOnScopeChains(Param, FnBodyScope); 7433 } 7434 } 7435 7436 // If we had any tags defined in the function prototype, 7437 // introduce them into the function scope. 7438 if (FnBodyScope) { 7439 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(), 7440 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) { 7441 NamedDecl *D = *I; 7442 7443 // Some of these decls (like enums) may have been pinned to the translation unit 7444 // for lack of a real context earlier. If so, remove from the translation unit 7445 // and reattach to the current context. 7446 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) { 7447 // Is the decl actually in the context? 7448 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(), 7449 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) { 7450 if (*DI == D) { 7451 Context.getTranslationUnitDecl()->removeDecl(D); 7452 break; 7453 } 7454 } 7455 // Either way, reassign the lexical decl context to our FunctionDecl. 7456 D->setLexicalDeclContext(CurContext); 7457 } 7458 7459 // If the decl has a non-null name, make accessible in the current scope. 7460 if (!D->getName().empty()) 7461 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false); 7462 7463 // Similarly, dive into enums and fish their constants out, making them 7464 // accessible in this scope. 7465 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) { 7466 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(), 7467 EE = ED->enumerator_end(); EI != EE; ++EI) 7468 PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false); 7469 } 7470 } 7471 } 7472 7473 // Ensure that the function's exception specification is instantiated. 7474 if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>()) 7475 ResolveExceptionSpec(D->getLocation(), FPT); 7476 7477 // Checking attributes of current function definition 7478 // dllimport attribute. 7479 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7480 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7481 // dllimport attribute cannot be directly applied to definition. 7482 // Microsoft accepts dllimport for functions defined within class scope. 7483 if (!DA->isInherited() && 7484 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7485 Diag(FD->getLocation(), 7486 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7487 << "dllimport"; 7488 FD->setInvalidDecl(); 7489 return FD; 7490 } 7491 7492 // Visual C++ appears to not think this is an issue, so only issue 7493 // a warning when Microsoft extensions are disabled. 7494 if (!LangOpts.MicrosoftExt) { 7495 // If a symbol previously declared dllimport is later defined, the 7496 // attribute is ignored in subsequent references, and a warning is 7497 // emitted. 7498 Diag(FD->getLocation(), 7499 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7500 << FD->getName() << "dllimport"; 7501 } 7502 } 7503 return FD; 7504} 7505 7506/// \brief Given the set of return statements within a function body, 7507/// compute the variables that are subject to the named return value 7508/// optimization. 7509/// 7510/// Each of the variables that is subject to the named return value 7511/// optimization will be marked as NRVO variables in the AST, and any 7512/// return statement that has a marked NRVO variable as its NRVO candidate can 7513/// use the named return value optimization. 7514/// 7515/// This function applies a very simplistic algorithm for NRVO: if every return 7516/// statement in the function has the same NRVO candidate, that candidate is 7517/// the NRVO variable. 7518/// 7519/// FIXME: Employ a smarter algorithm that accounts for multiple return 7520/// statements and the lifetimes of the NRVO candidates. We should be able to 7521/// find a maximal set of NRVO variables. 7522void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7523 ReturnStmt **Returns = Scope->Returns.data(); 7524 7525 const VarDecl *NRVOCandidate = 0; 7526 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7527 if (!Returns[I]->getNRVOCandidate()) 7528 return; 7529 7530 if (!NRVOCandidate) 7531 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7532 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7533 return; 7534 } 7535 7536 if (NRVOCandidate) 7537 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7538} 7539 7540Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7541 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7542} 7543 7544Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7545 bool IsInstantiation) { 7546 FunctionDecl *FD = 0; 7547 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7548 if (FunTmpl) 7549 FD = FunTmpl->getTemplatedDecl(); 7550 else 7551 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7552 7553 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7554 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7555 7556 if (FD) { 7557 FD->setBody(Body); 7558 7559 // If the function implicitly returns zero (like 'main') or is naked, 7560 // don't complain about missing return statements. 7561 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) 7562 WP.disableCheckFallThrough(); 7563 7564 // MSVC permits the use of pure specifier (=0) on function definition, 7565 // defined at class scope, warn about this non standard construct. 7566 if (getLangOpts().MicrosoftExt && FD->isPure()) 7567 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7568 7569 if (!FD->isInvalidDecl()) { 7570 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7571 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7572 FD->getResultType(), FD); 7573 7574 // If this is a constructor, we need a vtable. 7575 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7576 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7577 7578 computeNRVO(Body, getCurFunction()); 7579 } 7580 7581 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 7582 "Function parsing confused"); 7583 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7584 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7585 MD->setBody(Body); 7586 if (Body) 7587 MD->setEndLoc(Body->getLocEnd()); 7588 if (!MD->isInvalidDecl()) { 7589 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7590 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7591 MD->getResultType(), MD); 7592 7593 if (Body) 7594 computeNRVO(Body, getCurFunction()); 7595 } 7596 if (ObjCShouldCallSuperDealloc) { 7597 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7598 ObjCShouldCallSuperDealloc = false; 7599 } 7600 if (ObjCShouldCallSuperFinalize) { 7601 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7602 ObjCShouldCallSuperFinalize = false; 7603 } 7604 } else { 7605 return 0; 7606 } 7607 7608 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7609 "ObjC methods, which should have been handled in the block above."); 7610 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7611 "ObjC methods, which should have been handled in the block above."); 7612 7613 // Verify and clean out per-function state. 7614 if (Body) { 7615 // C++ constructors that have function-try-blocks can't have return 7616 // statements in the handlers of that block. (C++ [except.handle]p14) 7617 // Verify this. 7618 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7619 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7620 7621 // Verify that gotos and switch cases don't jump into scopes illegally. 7622 if (getCurFunction()->NeedsScopeChecking() && 7623 !dcl->isInvalidDecl() && 7624 !hasAnyUnrecoverableErrorsInThisFunction()) 7625 DiagnoseInvalidJumps(Body); 7626 7627 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7628 if (!Destructor->getParent()->isDependentType()) 7629 CheckDestructor(Destructor); 7630 7631 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7632 Destructor->getParent()); 7633 } 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 (PP.getDiagnostics().hasErrorOccurred() || 7639 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7640 DiscardCleanupsInEvaluationContext(); 7641 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7642 // Since the body is valid, issue any analysis-based warnings that are 7643 // enabled. 7644 ActivePolicy = &WP; 7645 } 7646 7647 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7648 (!CheckConstexprFunctionDecl(FD) || 7649 !CheckConstexprFunctionBody(FD, Body))) 7650 FD->setInvalidDecl(); 7651 7652 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7653 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7654 assert(MaybeODRUseExprs.empty() && 7655 "Leftover expressions for odr-use checking"); 7656 } 7657 7658 if (!IsInstantiation) 7659 PopDeclContext(); 7660 7661 PopFunctionScopeInfo(ActivePolicy, dcl); 7662 7663 // If any errors have occurred, clear out any temporaries that may have 7664 // been leftover. This ensures that these temporaries won't be picked up for 7665 // deletion in some later function. 7666 if (getDiagnostics().hasErrorOccurred()) { 7667 DiscardCleanupsInEvaluationContext(); 7668 } 7669 7670 return dcl; 7671} 7672 7673 7674/// When we finish delayed parsing of an attribute, we must attach it to the 7675/// relevant Decl. 7676void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7677 ParsedAttributes &Attrs) { 7678 // Always attach attributes to the underlying decl. 7679 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7680 D = TD->getTemplatedDecl(); 7681 ProcessDeclAttributeList(S, D, Attrs.getList()); 7682 7683 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D)) 7684 if (Method->isStatic()) 7685 checkThisInStaticMemberFunctionAttributes(Method); 7686} 7687 7688 7689/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7690/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7691NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7692 IdentifierInfo &II, Scope *S) { 7693 // Before we produce a declaration for an implicitly defined 7694 // function, see whether there was a locally-scoped declaration of 7695 // this name as a function or variable. If so, use that 7696 // (non-visible) declaration, and complain about it. 7697 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7698 = findLocallyScopedExternalDecl(&II); 7699 if (Pos != LocallyScopedExternalDecls.end()) { 7700 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7701 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7702 return Pos->second; 7703 } 7704 7705 // Extension in C99. Legal in C90, but warn about it. 7706 unsigned diag_id; 7707 if (II.getName().startswith("__builtin_")) 7708 diag_id = diag::warn_builtin_unknown; 7709 else if (getLangOpts().C99) 7710 diag_id = diag::ext_implicit_function_decl; 7711 else 7712 diag_id = diag::warn_implicit_function_decl; 7713 Diag(Loc, diag_id) << &II; 7714 7715 // Because typo correction is expensive, only do it if the implicit 7716 // function declaration is going to be treated as an error. 7717 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7718 TypoCorrection Corrected; 7719 DeclFilterCCC<FunctionDecl> Validator; 7720 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7721 LookupOrdinaryName, S, 0, Validator))) { 7722 std::string CorrectedStr = Corrected.getAsString(getLangOpts()); 7723 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts()); 7724 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7725 7726 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7727 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7728 7729 if (Func->getLocation().isValid() 7730 && !II.getName().startswith("__builtin_")) 7731 Diag(Func->getLocation(), diag::note_previous_decl) 7732 << CorrectedQuotedStr; 7733 } 7734 } 7735 7736 // Set a Declarator for the implicit definition: int foo(); 7737 const char *Dummy; 7738 AttributeFactory attrFactory; 7739 DeclSpec DS(attrFactory); 7740 unsigned DiagID; 7741 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7742 (void)Error; // Silence warning. 7743 assert(!Error && "Error setting up implicit decl!"); 7744 Declarator D(DS, Declarator::BlockContext); 7745 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7746 0, 0, true, SourceLocation(), 7747 SourceLocation(), SourceLocation(), 7748 SourceLocation(), 7749 EST_None, SourceLocation(), 7750 0, 0, 0, 0, Loc, Loc, D), 7751 DS.getAttributes(), 7752 SourceLocation()); 7753 D.SetIdentifier(&II, Loc); 7754 7755 // Insert this function into translation-unit scope. 7756 7757 DeclContext *PrevDC = CurContext; 7758 CurContext = Context.getTranslationUnitDecl(); 7759 7760 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7761 FD->setImplicit(); 7762 7763 CurContext = PrevDC; 7764 7765 AddKnownFunctionAttributes(FD); 7766 7767 return FD; 7768} 7769 7770/// \brief Adds any function attributes that we know a priori based on 7771/// the declaration of this function. 7772/// 7773/// These attributes can apply both to implicitly-declared builtins 7774/// (like __builtin___printf_chk) or to library-declared functions 7775/// like NSLog or printf. 7776/// 7777/// We need to check for duplicate attributes both here and where user-written 7778/// attributes are applied to declarations. 7779void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7780 if (FD->isInvalidDecl()) 7781 return; 7782 7783 // If this is a built-in function, map its builtin attributes to 7784 // actual attributes. 7785 if (unsigned BuiltinID = FD->getBuiltinID()) { 7786 // Handle printf-formatting attributes. 7787 unsigned FormatIdx; 7788 bool HasVAListArg; 7789 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7790 if (!FD->getAttr<FormatAttr>()) { 7791 const char *fmt = "printf"; 7792 unsigned int NumParams = FD->getNumParams(); 7793 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7794 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7795 fmt = "NSString"; 7796 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7797 fmt, FormatIdx+1, 7798 HasVAListArg ? 0 : FormatIdx+2)); 7799 } 7800 } 7801 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7802 HasVAListArg)) { 7803 if (!FD->getAttr<FormatAttr>()) 7804 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7805 "scanf", FormatIdx+1, 7806 HasVAListArg ? 0 : FormatIdx+2)); 7807 } 7808 7809 // Mark const if we don't care about errno and that is the only 7810 // thing preventing the function from being const. This allows 7811 // IRgen to use LLVM intrinsics for such functions. 7812 if (!getLangOpts().MathErrno && 7813 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7814 if (!FD->getAttr<ConstAttr>()) 7815 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7816 } 7817 7818 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7819 !FD->getAttr<ReturnsTwiceAttr>()) 7820 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7821 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7822 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7823 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7824 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7825 } 7826 7827 IdentifierInfo *Name = FD->getIdentifier(); 7828 if (!Name) 7829 return; 7830 if ((!getLangOpts().CPlusPlus && 7831 FD->getDeclContext()->isTranslationUnit()) || 7832 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7833 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7834 LinkageSpecDecl::lang_c)) { 7835 // Okay: this could be a libc/libm/Objective-C function we know 7836 // about. 7837 } else 7838 return; 7839 7840 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7841 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7842 // target-specific builtins, perhaps? 7843 if (!FD->getAttr<FormatAttr>()) 7844 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7845 "printf", 2, 7846 Name->isStr("vasprintf") ? 0 : 3)); 7847 } 7848} 7849 7850TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7851 TypeSourceInfo *TInfo) { 7852 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7853 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7854 7855 if (!TInfo) { 7856 assert(D.isInvalidType() && "no declarator info for valid type"); 7857 TInfo = Context.getTrivialTypeSourceInfo(T); 7858 } 7859 7860 // Scope manipulation handled by caller. 7861 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7862 D.getLocStart(), 7863 D.getIdentifierLoc(), 7864 D.getIdentifier(), 7865 TInfo); 7866 7867 // Bail out immediately if we have an invalid declaration. 7868 if (D.isInvalidType()) { 7869 NewTD->setInvalidDecl(); 7870 return NewTD; 7871 } 7872 7873 if (D.getDeclSpec().isModulePrivateSpecified()) { 7874 if (CurContext->isFunctionOrMethod()) 7875 Diag(NewTD->getLocation(), diag::err_module_private_local) 7876 << 2 << NewTD->getDeclName() 7877 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7878 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7879 else 7880 NewTD->setModulePrivate(); 7881 } 7882 7883 // C++ [dcl.typedef]p8: 7884 // If the typedef declaration defines an unnamed class (or 7885 // enum), the first typedef-name declared by the declaration 7886 // to be that class type (or enum type) is used to denote the 7887 // class type (or enum type) for linkage purposes only. 7888 // We need to check whether the type was declared in the declaration. 7889 switch (D.getDeclSpec().getTypeSpecType()) { 7890 case TST_enum: 7891 case TST_struct: 7892 case TST_union: 7893 case TST_class: { 7894 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7895 7896 // Do nothing if the tag is not anonymous or already has an 7897 // associated typedef (from an earlier typedef in this decl group). 7898 if (tagFromDeclSpec->getIdentifier()) break; 7899 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7900 7901 // A well-formed anonymous tag must always be a TUK_Definition. 7902 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7903 7904 // The type must match the tag exactly; no qualifiers allowed. 7905 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7906 break; 7907 7908 // Otherwise, set this is the anon-decl typedef for the tag. 7909 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7910 break; 7911 } 7912 7913 default: 7914 break; 7915 } 7916 7917 return NewTD; 7918} 7919 7920 7921/// \brief Check that this is a valid underlying type for an enum declaration. 7922bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) { 7923 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7924 QualType T = TI->getType(); 7925 7926 if (T->isDependentType() || T->isIntegralType(Context)) 7927 return false; 7928 7929 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T; 7930 return true; 7931} 7932 7933/// Check whether this is a valid redeclaration of a previous enumeration. 7934/// \return true if the redeclaration was invalid. 7935bool Sema::CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped, 7936 QualType EnumUnderlyingTy, 7937 const EnumDecl *Prev) { 7938 bool IsFixed = !EnumUnderlyingTy.isNull(); 7939 7940 if (IsScoped != Prev->isScoped()) { 7941 Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch) 7942 << Prev->isScoped(); 7943 Diag(Prev->getLocation(), diag::note_previous_use); 7944 return true; 7945 } 7946 7947 if (IsFixed && Prev->isFixed()) { 7948 if (!EnumUnderlyingTy->isDependentType() && 7949 !Prev->getIntegerType()->isDependentType() && 7950 !Context.hasSameUnqualifiedType(EnumUnderlyingTy, 7951 Prev->getIntegerType())) { 7952 Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch) 7953 << EnumUnderlyingTy << Prev->getIntegerType(); 7954 Diag(Prev->getLocation(), diag::note_previous_use); 7955 return true; 7956 } 7957 } else if (IsFixed != Prev->isFixed()) { 7958 Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch) 7959 << Prev->isFixed(); 7960 Diag(Prev->getLocation(), diag::note_previous_use); 7961 return true; 7962 } 7963 7964 return false; 7965} 7966 7967/// \brief Determine whether a tag with a given kind is acceptable 7968/// as a redeclaration of the given tag declaration. 7969/// 7970/// \returns true if the new tag kind is acceptable, false otherwise. 7971bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7972 TagTypeKind NewTag, bool isDefinition, 7973 SourceLocation NewTagLoc, 7974 const IdentifierInfo &Name) { 7975 // C++ [dcl.type.elab]p3: 7976 // The class-key or enum keyword present in the 7977 // elaborated-type-specifier shall agree in kind with the 7978 // declaration to which the name in the elaborated-type-specifier 7979 // refers. This rule also applies to the form of 7980 // elaborated-type-specifier that declares a class-name or 7981 // friend class since it can be construed as referring to the 7982 // definition of the class. Thus, in any 7983 // elaborated-type-specifier, the enum keyword shall be used to 7984 // refer to an enumeration (7.2), the union class-key shall be 7985 // used to refer to a union (clause 9), and either the class or 7986 // struct class-key shall be used to refer to a class (clause 9) 7987 // declared using the class or struct class-key. 7988 TagTypeKind OldTag = Previous->getTagKind(); 7989 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7990 if (OldTag == NewTag) 7991 return true; 7992 7993 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7994 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7995 // Warn about the struct/class tag mismatch. 7996 bool isTemplate = false; 7997 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7998 isTemplate = Record->getDescribedClassTemplate(); 7999 8000 if (!ActiveTemplateInstantiations.empty()) { 8001 // In a template instantiation, do not offer fix-its for tag mismatches 8002 // since they usually mess up the template instead of fixing the problem. 8003 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 8004 << (NewTag == TTK_Class) << isTemplate << &Name; 8005 return true; 8006 } 8007 8008 if (isDefinition) { 8009 // On definitions, check previous tags and issue a fix-it for each 8010 // one that doesn't match the current tag. 8011 if (Previous->getDefinition()) { 8012 // Don't suggest fix-its for redefinitions. 8013 return true; 8014 } 8015 8016 bool previousMismatch = false; 8017 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 8018 E(Previous->redecls_end()); I != E; ++I) { 8019 if (I->getTagKind() != NewTag) { 8020 if (!previousMismatch) { 8021 previousMismatch = true; 8022 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 8023 << (NewTag == TTK_Class) << isTemplate << &Name; 8024 } 8025 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 8026 << (NewTag == TTK_Class) 8027 << FixItHint::CreateReplacement(I->getInnerLocStart(), 8028 NewTag == TTK_Class? 8029 "class" : "struct"); 8030 } 8031 } 8032 return true; 8033 } 8034 8035 // Check for a previous definition. If current tag and definition 8036 // are same type, do nothing. If no definition, but disagree with 8037 // with previous tag type, give a warning, but no fix-it. 8038 const TagDecl *Redecl = Previous->getDefinition() ? 8039 Previous->getDefinition() : Previous; 8040 if (Redecl->getTagKind() == NewTag) { 8041 return true; 8042 } 8043 8044 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 8045 << (NewTag == TTK_Class) 8046 << isTemplate << &Name; 8047 Diag(Redecl->getLocation(), diag::note_previous_use); 8048 8049 // If there is a previous defintion, suggest a fix-it. 8050 if (Previous->getDefinition()) { 8051 Diag(NewTagLoc, diag::note_struct_class_suggestion) 8052 << (Redecl->getTagKind() == TTK_Class) 8053 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 8054 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 8055 } 8056 8057 return true; 8058 } 8059 return false; 8060} 8061 8062/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 8063/// former case, Name will be non-null. In the later case, Name will be null. 8064/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 8065/// reference/declaration/definition of a tag. 8066Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 8067 SourceLocation KWLoc, CXXScopeSpec &SS, 8068 IdentifierInfo *Name, SourceLocation NameLoc, 8069 AttributeList *Attr, AccessSpecifier AS, 8070 SourceLocation ModulePrivateLoc, 8071 MultiTemplateParamsArg TemplateParameterLists, 8072 bool &OwnedDecl, bool &IsDependent, 8073 SourceLocation ScopedEnumKWLoc, 8074 bool ScopedEnumUsesClassTag, 8075 TypeResult UnderlyingType) { 8076 // If this is not a definition, it must have a name. 8077 IdentifierInfo *OrigName = Name; 8078 assert((Name != 0 || TUK == TUK_Definition) && 8079 "Nameless record must be a definition!"); 8080 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 8081 8082 OwnedDecl = false; 8083 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8084 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 8085 8086 // FIXME: Check explicit specializations more carefully. 8087 bool isExplicitSpecialization = false; 8088 bool Invalid = false; 8089 8090 // We only need to do this matching if we have template parameters 8091 // or a scope specifier, which also conveniently avoids this work 8092 // for non-C++ cases. 8093 if (TemplateParameterLists.size() > 0 || 8094 (SS.isNotEmpty() && TUK != TUK_Reference)) { 8095 if (TemplateParameterList *TemplateParams 8096 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 8097 TemplateParameterLists.get(), 8098 TemplateParameterLists.size(), 8099 TUK == TUK_Friend, 8100 isExplicitSpecialization, 8101 Invalid)) { 8102 if (TemplateParams->size() > 0) { 8103 // This is a declaration or definition of a class template (which may 8104 // be a member of another template). 8105 8106 if (Invalid) 8107 return 0; 8108 8109 OwnedDecl = false; 8110 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 8111 SS, Name, NameLoc, Attr, 8112 TemplateParams, AS, 8113 ModulePrivateLoc, 8114 TemplateParameterLists.size() - 1, 8115 (TemplateParameterList**) TemplateParameterLists.release()); 8116 return Result.get(); 8117 } else { 8118 // The "template<>" header is extraneous. 8119 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8120 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8121 isExplicitSpecialization = true; 8122 } 8123 } 8124 } 8125 8126 // Figure out the underlying type if this a enum declaration. We need to do 8127 // this early, because it's needed to detect if this is an incompatible 8128 // redeclaration. 8129 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 8130 8131 if (Kind == TTK_Enum) { 8132 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 8133 // No underlying type explicitly specified, or we failed to parse the 8134 // type, default to int. 8135 EnumUnderlying = Context.IntTy.getTypePtr(); 8136 else if (UnderlyingType.get()) { 8137 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 8138 // integral type; any cv-qualification is ignored. 8139 TypeSourceInfo *TI = 0; 8140 GetTypeFromParser(UnderlyingType.get(), &TI); 8141 EnumUnderlying = TI; 8142 8143 if (CheckEnumUnderlyingType(TI)) 8144 // Recover by falling back to int. 8145 EnumUnderlying = Context.IntTy.getTypePtr(); 8146 8147 if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI, 8148 UPPC_FixedUnderlyingType)) 8149 EnumUnderlying = Context.IntTy.getTypePtr(); 8150 8151 } else if (getLangOpts().MicrosoftMode) 8152 // Microsoft enums are always of int type. 8153 EnumUnderlying = Context.IntTy.getTypePtr(); 8154 } 8155 8156 DeclContext *SearchDC = CurContext; 8157 DeclContext *DC = CurContext; 8158 bool isStdBadAlloc = false; 8159 8160 RedeclarationKind Redecl = ForRedeclaration; 8161 if (TUK == TUK_Friend || TUK == TUK_Reference) 8162 Redecl = NotForRedeclaration; 8163 8164 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 8165 8166 if (Name && SS.isNotEmpty()) { 8167 // We have a nested-name tag ('struct foo::bar'). 8168 8169 // Check for invalid 'foo::'. 8170 if (SS.isInvalid()) { 8171 Name = 0; 8172 goto CreateNewDecl; 8173 } 8174 8175 // If this is a friend or a reference to a class in a dependent 8176 // context, don't try to make a decl for it. 8177 if (TUK == TUK_Friend || TUK == TUK_Reference) { 8178 DC = computeDeclContext(SS, false); 8179 if (!DC) { 8180 IsDependent = true; 8181 return 0; 8182 } 8183 } else { 8184 DC = computeDeclContext(SS, true); 8185 if (!DC) { 8186 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 8187 << SS.getRange(); 8188 return 0; 8189 } 8190 } 8191 8192 if (RequireCompleteDeclContext(SS, DC)) 8193 return 0; 8194 8195 SearchDC = DC; 8196 // Look-up name inside 'foo::'. 8197 LookupQualifiedName(Previous, DC); 8198 8199 if (Previous.isAmbiguous()) 8200 return 0; 8201 8202 if (Previous.empty()) { 8203 // Name lookup did not find anything. However, if the 8204 // nested-name-specifier refers to the current instantiation, 8205 // and that current instantiation has any dependent base 8206 // classes, we might find something at instantiation time: treat 8207 // this as a dependent elaborated-type-specifier. 8208 // But this only makes any sense for reference-like lookups. 8209 if (Previous.wasNotFoundInCurrentInstantiation() && 8210 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8211 IsDependent = true; 8212 return 0; 8213 } 8214 8215 // A tag 'foo::bar' must already exist. 8216 Diag(NameLoc, diag::err_not_tag_in_scope) 8217 << Kind << Name << DC << SS.getRange(); 8218 Name = 0; 8219 Invalid = true; 8220 goto CreateNewDecl; 8221 } 8222 } else if (Name) { 8223 // If this is a named struct, check to see if there was a previous forward 8224 // declaration or definition. 8225 // FIXME: We're looking into outer scopes here, even when we 8226 // shouldn't be. Doing so can result in ambiguities that we 8227 // shouldn't be diagnosing. 8228 LookupName(Previous, S); 8229 8230 if (Previous.isAmbiguous() && 8231 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 8232 LookupResult::Filter F = Previous.makeFilter(); 8233 while (F.hasNext()) { 8234 NamedDecl *ND = F.next(); 8235 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 8236 F.erase(); 8237 } 8238 F.done(); 8239 } 8240 8241 // Note: there used to be some attempt at recovery here. 8242 if (Previous.isAmbiguous()) 8243 return 0; 8244 8245 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) { 8246 // FIXME: This makes sure that we ignore the contexts associated 8247 // with C structs, unions, and enums when looking for a matching 8248 // tag declaration or definition. See the similar lookup tweak 8249 // in Sema::LookupName; is there a better way to deal with this? 8250 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 8251 SearchDC = SearchDC->getParent(); 8252 } 8253 } else if (S->isFunctionPrototypeScope()) { 8254 // If this is an enum declaration in function prototype scope, set its 8255 // initial context to the translation unit. 8256 // FIXME: [citation needed] 8257 SearchDC = Context.getTranslationUnitDecl(); 8258 } 8259 8260 if (Previous.isSingleResult() && 8261 Previous.getFoundDecl()->isTemplateParameter()) { 8262 // Maybe we will complain about the shadowed template parameter. 8263 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 8264 // Just pretend that we didn't see the previous declaration. 8265 Previous.clear(); 8266 } 8267 8268 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace && 8269 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 8270 // This is a declaration of or a reference to "std::bad_alloc". 8271 isStdBadAlloc = true; 8272 8273 if (Previous.empty() && StdBadAlloc) { 8274 // std::bad_alloc has been implicitly declared (but made invisible to 8275 // name lookup). Fill in this implicit declaration as the previous 8276 // declaration, so that the declarations get chained appropriately. 8277 Previous.addDecl(getStdBadAlloc()); 8278 } 8279 } 8280 8281 // If we didn't find a previous declaration, and this is a reference 8282 // (or friend reference), move to the correct scope. In C++, we 8283 // also need to do a redeclaration lookup there, just in case 8284 // there's a shadow friend decl. 8285 if (Name && Previous.empty() && 8286 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8287 if (Invalid) goto CreateNewDecl; 8288 assert(SS.isEmpty()); 8289 8290 if (TUK == TUK_Reference) { 8291 // C++ [basic.scope.pdecl]p5: 8292 // -- for an elaborated-type-specifier of the form 8293 // 8294 // class-key identifier 8295 // 8296 // if the elaborated-type-specifier is used in the 8297 // decl-specifier-seq or parameter-declaration-clause of a 8298 // function defined in namespace scope, the identifier is 8299 // declared as a class-name in the namespace that contains 8300 // the declaration; otherwise, except as a friend 8301 // declaration, the identifier is declared in the smallest 8302 // non-class, non-function-prototype scope that contains the 8303 // declaration. 8304 // 8305 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 8306 // C structs and unions. 8307 // 8308 // It is an error in C++ to declare (rather than define) an enum 8309 // type, including via an elaborated type specifier. We'll 8310 // diagnose that later; for now, declare the enum in the same 8311 // scope as we would have picked for any other tag type. 8312 // 8313 // GNU C also supports this behavior as part of its incomplete 8314 // enum types extension, while GNU C++ does not. 8315 // 8316 // Find the context where we'll be declaring the tag. 8317 // FIXME: We would like to maintain the current DeclContext as the 8318 // lexical context, 8319 while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod()) 8320 SearchDC = SearchDC->getParent(); 8321 8322 // Find the scope where we'll be declaring the tag. 8323 while (S->isClassScope() || 8324 (getLangOpts().CPlusPlus && 8325 S->isFunctionPrototypeScope()) || 8326 ((S->getFlags() & Scope::DeclScope) == 0) || 8327 (S->getEntity() && 8328 ((DeclContext *)S->getEntity())->isTransparentContext())) 8329 S = S->getParent(); 8330 } else { 8331 assert(TUK == TUK_Friend); 8332 // C++ [namespace.memdef]p3: 8333 // If a friend declaration in a non-local class first declares a 8334 // class or function, the friend class or function is a member of 8335 // the innermost enclosing namespace. 8336 SearchDC = SearchDC->getEnclosingNamespaceContext(); 8337 } 8338 8339 // In C++, we need to do a redeclaration lookup to properly 8340 // diagnose some problems. 8341 if (getLangOpts().CPlusPlus) { 8342 Previous.setRedeclarationKind(ForRedeclaration); 8343 LookupQualifiedName(Previous, SearchDC); 8344 } 8345 } 8346 8347 if (!Previous.empty()) { 8348 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 8349 8350 // It's okay to have a tag decl in the same scope as a typedef 8351 // which hides a tag decl in the same scope. Finding this 8352 // insanity with a redeclaration lookup can only actually happen 8353 // in C++. 8354 // 8355 // This is also okay for elaborated-type-specifiers, which is 8356 // technically forbidden by the current standard but which is 8357 // okay according to the likely resolution of an open issue; 8358 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 8359 if (getLangOpts().CPlusPlus) { 8360 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8361 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 8362 TagDecl *Tag = TT->getDecl(); 8363 if (Tag->getDeclName() == Name && 8364 Tag->getDeclContext()->getRedeclContext() 8365 ->Equals(TD->getDeclContext()->getRedeclContext())) { 8366 PrevDecl = Tag; 8367 Previous.clear(); 8368 Previous.addDecl(Tag); 8369 Previous.resolveKind(); 8370 } 8371 } 8372 } 8373 } 8374 8375 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 8376 // If this is a use of a previous tag, or if the tag is already declared 8377 // in the same scope (so that the definition/declaration completes or 8378 // rementions the tag), reuse the decl. 8379 if (TUK == TUK_Reference || TUK == TUK_Friend || 8380 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 8381 // Make sure that this wasn't declared as an enum and now used as a 8382 // struct or something similar. 8383 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 8384 TUK == TUK_Definition, KWLoc, 8385 *Name)) { 8386 bool SafeToContinue 8387 = (PrevTagDecl->getTagKind() != TTK_Enum && 8388 Kind != TTK_Enum); 8389 if (SafeToContinue) 8390 Diag(KWLoc, diag::err_use_with_wrong_tag) 8391 << Name 8392 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8393 PrevTagDecl->getKindName()); 8394 else 8395 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8396 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8397 8398 if (SafeToContinue) 8399 Kind = PrevTagDecl->getTagKind(); 8400 else { 8401 // Recover by making this an anonymous redefinition. 8402 Name = 0; 8403 Previous.clear(); 8404 Invalid = true; 8405 } 8406 } 8407 8408 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8409 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8410 8411 // If this is an elaborated-type-specifier for a scoped enumeration, 8412 // the 'class' keyword is not necessary and not permitted. 8413 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8414 if (ScopedEnum) 8415 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8416 << PrevEnum->isScoped() 8417 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8418 return PrevTagDecl; 8419 } 8420 8421 QualType EnumUnderlyingTy; 8422 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8423 EnumUnderlyingTy = TI->getType(); 8424 else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>()) 8425 EnumUnderlyingTy = QualType(T, 0); 8426 8427 // All conflicts with previous declarations are recovered by 8428 // returning the previous declaration, unless this is a definition, 8429 // in which case we want the caller to bail out. 8430 if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc, 8431 ScopedEnum, EnumUnderlyingTy, PrevEnum)) 8432 return TUK == TUK_Declaration ? PrevTagDecl : 0; 8433 } 8434 8435 if (!Invalid) { 8436 // If this is a use, just return the declaration we found. 8437 8438 // FIXME: In the future, return a variant or some other clue 8439 // for the consumer of this Decl to know it doesn't own it. 8440 // For our current ASTs this shouldn't be a problem, but will 8441 // need to be changed with DeclGroups. 8442 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8443 getLangOpts().MicrosoftExt)) || TUK == TUK_Friend) 8444 return PrevTagDecl; 8445 8446 // Diagnose attempts to redefine a tag. 8447 if (TUK == TUK_Definition) { 8448 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8449 // If we're defining a specialization and the previous definition 8450 // is from an implicit instantiation, don't emit an error 8451 // here; we'll catch this in the general case below. 8452 bool IsExplicitSpecializationAfterInstantiation = false; 8453 if (isExplicitSpecialization) { 8454 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def)) 8455 IsExplicitSpecializationAfterInstantiation = 8456 RD->getTemplateSpecializationKind() != 8457 TSK_ExplicitSpecialization; 8458 else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def)) 8459 IsExplicitSpecializationAfterInstantiation = 8460 ED->getTemplateSpecializationKind() != 8461 TSK_ExplicitSpecialization; 8462 } 8463 8464 if (!IsExplicitSpecializationAfterInstantiation) { 8465 // A redeclaration in function prototype scope in C isn't 8466 // visible elsewhere, so merely issue a warning. 8467 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope()) 8468 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name; 8469 else 8470 Diag(NameLoc, diag::err_redefinition) << Name; 8471 Diag(Def->getLocation(), diag::note_previous_definition); 8472 // If this is a redefinition, recover by making this 8473 // struct be anonymous, which will make any later 8474 // references get the previous definition. 8475 Name = 0; 8476 Previous.clear(); 8477 Invalid = true; 8478 } 8479 } else { 8480 // If the type is currently being defined, complain 8481 // about a nested redefinition. 8482 const TagType *Tag 8483 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8484 if (Tag->isBeingDefined()) { 8485 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8486 Diag(PrevTagDecl->getLocation(), 8487 diag::note_previous_definition); 8488 Name = 0; 8489 Previous.clear(); 8490 Invalid = true; 8491 } 8492 } 8493 8494 // Okay, this is definition of a previously declared or referenced 8495 // tag PrevDecl. We're going to create a new Decl for it. 8496 } 8497 } 8498 // If we get here we have (another) forward declaration or we 8499 // have a definition. Just create a new decl. 8500 8501 } else { 8502 // If we get here, this is a definition of a new tag type in a nested 8503 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8504 // new decl/type. We set PrevDecl to NULL so that the entities 8505 // have distinct types. 8506 Previous.clear(); 8507 } 8508 // If we get here, we're going to create a new Decl. If PrevDecl 8509 // is non-NULL, it's a definition of the tag declared by 8510 // PrevDecl. If it's NULL, we have a new definition. 8511 8512 8513 // Otherwise, PrevDecl is not a tag, but was found with tag 8514 // lookup. This is only actually possible in C++, where a few 8515 // things like templates still live in the tag namespace. 8516 } else { 8517 // Use a better diagnostic if an elaborated-type-specifier 8518 // found the wrong kind of type on the first 8519 // (non-redeclaration) lookup. 8520 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8521 !Previous.isForRedeclaration()) { 8522 unsigned Kind = 0; 8523 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8524 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8525 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8526 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8527 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8528 Invalid = true; 8529 8530 // Otherwise, only diagnose if the declaration is in scope. 8531 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8532 isExplicitSpecialization)) { 8533 // do nothing 8534 8535 // Diagnose implicit declarations introduced by elaborated types. 8536 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8537 unsigned Kind = 0; 8538 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8539 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8540 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8541 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8542 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8543 Invalid = true; 8544 8545 // Otherwise it's a declaration. Call out a particularly common 8546 // case here. 8547 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8548 unsigned Kind = 0; 8549 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8550 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8551 << Name << Kind << TND->getUnderlyingType(); 8552 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8553 Invalid = true; 8554 8555 // Otherwise, diagnose. 8556 } else { 8557 // The tag name clashes with something else in the target scope, 8558 // issue an error and recover by making this tag be anonymous. 8559 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8560 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8561 Name = 0; 8562 Invalid = true; 8563 } 8564 8565 // The existing declaration isn't relevant to us; we're in a 8566 // new scope, so clear out the previous declaration. 8567 Previous.clear(); 8568 } 8569 } 8570 8571CreateNewDecl: 8572 8573 TagDecl *PrevDecl = 0; 8574 if (Previous.isSingleResult()) 8575 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8576 8577 // If there is an identifier, use the location of the identifier as the 8578 // location of the decl, otherwise use the location of the struct/union 8579 // keyword. 8580 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8581 8582 // Otherwise, create a new declaration. If there is a previous 8583 // declaration of the same entity, the two will be linked via 8584 // PrevDecl. 8585 TagDecl *New; 8586 8587 bool IsForwardReference = false; 8588 if (Kind == TTK_Enum) { 8589 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8590 // enum X { A, B, C } D; D should chain to X. 8591 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8592 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8593 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8594 // If this is an undefined enum, warn. 8595 if (TUK != TUK_Definition && !Invalid) { 8596 TagDecl *Def; 8597 if (getLangOpts().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8598 // C++0x: 7.2p2: opaque-enum-declaration. 8599 // Conflicts are diagnosed above. Do nothing. 8600 } 8601 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8602 Diag(Loc, diag::ext_forward_ref_enum_def) 8603 << New; 8604 Diag(Def->getLocation(), diag::note_previous_definition); 8605 } else { 8606 unsigned DiagID = diag::ext_forward_ref_enum; 8607 if (getLangOpts().MicrosoftMode) 8608 DiagID = diag::ext_ms_forward_ref_enum; 8609 else if (getLangOpts().CPlusPlus) 8610 DiagID = diag::err_forward_ref_enum; 8611 Diag(Loc, DiagID); 8612 8613 // If this is a forward-declared reference to an enumeration, make a 8614 // note of it; we won't actually be introducing the declaration into 8615 // the declaration context. 8616 if (TUK == TUK_Reference) 8617 IsForwardReference = true; 8618 } 8619 } 8620 8621 if (EnumUnderlying) { 8622 EnumDecl *ED = cast<EnumDecl>(New); 8623 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8624 ED->setIntegerTypeSourceInfo(TI); 8625 else 8626 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8627 ED->setPromotionType(ED->getIntegerType()); 8628 } 8629 8630 } else { 8631 // struct/union/class 8632 8633 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8634 // struct X { int A; } D; D should chain to X. 8635 if (getLangOpts().CPlusPlus) { 8636 // FIXME: Look for a way to use RecordDecl for simple structs. 8637 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8638 cast_or_null<CXXRecordDecl>(PrevDecl)); 8639 8640 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8641 StdBadAlloc = cast<CXXRecordDecl>(New); 8642 } else 8643 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8644 cast_or_null<RecordDecl>(PrevDecl)); 8645 } 8646 8647 // Maybe add qualifier info. 8648 if (SS.isNotEmpty()) { 8649 if (SS.isSet()) { 8650 // If this is either a declaration or a definition, check the 8651 // nested-name-specifier against the current context. We don't do this 8652 // for explicit specializations, because they have similar checking 8653 // (with more specific diagnostics) in the call to 8654 // CheckMemberSpecialization, below. 8655 if (!isExplicitSpecialization && 8656 (TUK == TUK_Definition || TUK == TUK_Declaration) && 8657 diagnoseQualifiedDeclaration(SS, DC, OrigName, NameLoc)) 8658 Invalid = true; 8659 8660 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8661 if (TemplateParameterLists.size() > 0) { 8662 New->setTemplateParameterListsInfo(Context, 8663 TemplateParameterLists.size(), 8664 (TemplateParameterList**) TemplateParameterLists.release()); 8665 } 8666 } 8667 else 8668 Invalid = true; 8669 } 8670 8671 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8672 // Add alignment attributes if necessary; these attributes are checked when 8673 // the ASTContext lays out the structure. 8674 // 8675 // It is important for implementing the correct semantics that this 8676 // happen here (in act on tag decl). The #pragma pack stack is 8677 // maintained as a result of parser callbacks which can occur at 8678 // many points during the parsing of a struct declaration (because 8679 // the #pragma tokens are effectively skipped over during the 8680 // parsing of the struct). 8681 AddAlignmentAttributesForRecord(RD); 8682 8683 AddMsStructLayoutForRecord(RD); 8684 } 8685 8686 if (ModulePrivateLoc.isValid()) { 8687 if (isExplicitSpecialization) 8688 Diag(New->getLocation(), diag::err_module_private_specialization) 8689 << 2 8690 << FixItHint::CreateRemoval(ModulePrivateLoc); 8691 // __module_private__ does not apply to local classes. However, we only 8692 // diagnose this as an error when the declaration specifiers are 8693 // freestanding. Here, we just ignore the __module_private__. 8694 else if (!SearchDC->isFunctionOrMethod()) 8695 New->setModulePrivate(); 8696 } 8697 8698 // If this is a specialization of a member class (of a class template), 8699 // check the specialization. 8700 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8701 Invalid = true; 8702 8703 if (Invalid) 8704 New->setInvalidDecl(); 8705 8706 if (Attr) 8707 ProcessDeclAttributeList(S, New, Attr); 8708 8709 // If we're declaring or defining a tag in function prototype scope 8710 // in C, note that this type can only be used within the function. 8711 if (Name && S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus) 8712 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8713 8714 // Set the lexical context. If the tag has a C++ scope specifier, the 8715 // lexical context will be different from the semantic context. 8716 New->setLexicalDeclContext(CurContext); 8717 8718 // Mark this as a friend decl if applicable. 8719 // In Microsoft mode, a friend declaration also acts as a forward 8720 // declaration so we always pass true to setObjectOfFriendDecl to make 8721 // the tag name visible. 8722 if (TUK == TUK_Friend) 8723 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8724 getLangOpts().MicrosoftExt); 8725 8726 // Set the access specifier. 8727 if (!Invalid && SearchDC->isRecord()) 8728 SetMemberAccessSpecifier(New, PrevDecl, AS); 8729 8730 if (TUK == TUK_Definition) 8731 New->startDefinition(); 8732 8733 // If this has an identifier, add it to the scope stack. 8734 if (TUK == TUK_Friend) { 8735 // We might be replacing an existing declaration in the lookup tables; 8736 // if so, borrow its access specifier. 8737 if (PrevDecl) 8738 New->setAccess(PrevDecl->getAccess()); 8739 8740 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8741 DC->makeDeclVisibleInContext(New); 8742 if (Name) // can be null along some error paths 8743 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8744 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8745 } else if (Name) { 8746 S = getNonFieldDeclScope(S); 8747 PushOnScopeChains(New, S, !IsForwardReference); 8748 if (IsForwardReference) 8749 SearchDC->makeDeclVisibleInContext(New); 8750 8751 } else { 8752 CurContext->addDecl(New); 8753 } 8754 8755 // If this is the C FILE type, notify the AST context. 8756 if (IdentifierInfo *II = New->getIdentifier()) 8757 if (!New->isInvalidDecl() && 8758 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8759 II->isStr("FILE")) 8760 Context.setFILEDecl(New); 8761 8762 // If we were in function prototype scope (and not in C++ mode), add this 8763 // tag to the list of decls to inject into the function definition scope. 8764 if (S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus && 8765 InFunctionDeclarator && Name) 8766 DeclsInPrototypeScope.push_back(New); 8767 8768 if (PrevDecl) 8769 mergeDeclAttributes(New, PrevDecl); 8770 8771 OwnedDecl = true; 8772 return New; 8773} 8774 8775void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8776 AdjustDeclIfTemplate(TagD); 8777 TagDecl *Tag = cast<TagDecl>(TagD); 8778 8779 // Enter the tag context. 8780 PushDeclContext(S, Tag); 8781} 8782 8783Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8784 assert(isa<ObjCContainerDecl>(IDecl) && 8785 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8786 DeclContext *OCD = cast<DeclContext>(IDecl); 8787 assert(getContainingDC(OCD) == CurContext && 8788 "The next DeclContext should be lexically contained in the current one."); 8789 CurContext = OCD; 8790 return IDecl; 8791} 8792 8793void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8794 SourceLocation FinalLoc, 8795 SourceLocation LBraceLoc) { 8796 AdjustDeclIfTemplate(TagD); 8797 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8798 8799 FieldCollector->StartClass(); 8800 8801 if (!Record->getIdentifier()) 8802 return; 8803 8804 if (FinalLoc.isValid()) 8805 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8806 8807 // C++ [class]p2: 8808 // [...] The class-name is also inserted into the scope of the 8809 // class itself; this is known as the injected-class-name. For 8810 // purposes of access checking, the injected-class-name is treated 8811 // as if it were a public member name. 8812 CXXRecordDecl *InjectedClassName 8813 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8814 Record->getLocStart(), Record->getLocation(), 8815 Record->getIdentifier(), 8816 /*PrevDecl=*/0, 8817 /*DelayTypeCreation=*/true); 8818 Context.getTypeDeclType(InjectedClassName, Record); 8819 InjectedClassName->setImplicit(); 8820 InjectedClassName->setAccess(AS_public); 8821 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8822 InjectedClassName->setDescribedClassTemplate(Template); 8823 PushOnScopeChains(InjectedClassName, S); 8824 assert(InjectedClassName->isInjectedClassName() && 8825 "Broken injected-class-name"); 8826} 8827 8828void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8829 SourceLocation RBraceLoc) { 8830 AdjustDeclIfTemplate(TagD); 8831 TagDecl *Tag = cast<TagDecl>(TagD); 8832 Tag->setRBraceLoc(RBraceLoc); 8833 8834 // Make sure we "complete" the definition even it is invalid. 8835 if (Tag->isBeingDefined()) { 8836 assert(Tag->isInvalidDecl() && "We should already have completed it"); 8837 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 8838 RD->completeDefinition(); 8839 } 8840 8841 if (isa<CXXRecordDecl>(Tag)) 8842 FieldCollector->FinishClass(); 8843 8844 // Exit this scope of this tag's definition. 8845 PopDeclContext(); 8846 8847 // Notify the consumer that we've defined a tag. 8848 Consumer.HandleTagDeclDefinition(Tag); 8849} 8850 8851void Sema::ActOnObjCContainerFinishDefinition() { 8852 // Exit this scope of this interface definition. 8853 PopDeclContext(); 8854} 8855 8856void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8857 assert(DC == CurContext && "Mismatch of container contexts"); 8858 OriginalLexicalContext = DC; 8859 ActOnObjCContainerFinishDefinition(); 8860} 8861 8862void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8863 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8864 OriginalLexicalContext = 0; 8865} 8866 8867void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8868 AdjustDeclIfTemplate(TagD); 8869 TagDecl *Tag = cast<TagDecl>(TagD); 8870 Tag->setInvalidDecl(); 8871 8872 // Make sure we "complete" the definition even it is invalid. 8873 if (Tag->isBeingDefined()) { 8874 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 8875 RD->completeDefinition(); 8876 } 8877 8878 // We're undoing ActOnTagStartDefinition here, not 8879 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8880 // the FieldCollector. 8881 8882 PopDeclContext(); 8883} 8884 8885// Note that FieldName may be null for anonymous bitfields. 8886ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 8887 IdentifierInfo *FieldName, 8888 QualType FieldTy, Expr *BitWidth, 8889 bool *ZeroWidth) { 8890 // Default to true; that shouldn't confuse checks for emptiness 8891 if (ZeroWidth) 8892 *ZeroWidth = true; 8893 8894 // C99 6.7.2.1p4 - verify the field type. 8895 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8896 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8897 // Handle incomplete types with specific error. 8898 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8899 return ExprError(); 8900 if (FieldName) 8901 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8902 << FieldName << FieldTy << BitWidth->getSourceRange(); 8903 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8904 << FieldTy << BitWidth->getSourceRange(); 8905 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8906 UPPC_BitFieldWidth)) 8907 return ExprError(); 8908 8909 // If the bit-width is type- or value-dependent, don't try to check 8910 // it now. 8911 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8912 return Owned(BitWidth); 8913 8914 llvm::APSInt Value; 8915 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 8916 if (ICE.isInvalid()) 8917 return ICE; 8918 BitWidth = ICE.take(); 8919 8920 if (Value != 0 && ZeroWidth) 8921 *ZeroWidth = false; 8922 8923 // Zero-width bitfield is ok for anonymous field. 8924 if (Value == 0 && FieldName) 8925 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8926 8927 if (Value.isSigned() && Value.isNegative()) { 8928 if (FieldName) 8929 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8930 << FieldName << Value.toString(10); 8931 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8932 << Value.toString(10); 8933 } 8934 8935 if (!FieldTy->isDependentType()) { 8936 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8937 if (Value.getZExtValue() > TypeSize) { 8938 if (!getLangOpts().CPlusPlus) { 8939 if (FieldName) 8940 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8941 << FieldName << (unsigned)Value.getZExtValue() 8942 << (unsigned)TypeSize; 8943 8944 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8945 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8946 } 8947 8948 if (FieldName) 8949 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8950 << FieldName << (unsigned)Value.getZExtValue() 8951 << (unsigned)TypeSize; 8952 else 8953 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8954 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8955 } 8956 } 8957 8958 return Owned(BitWidth); 8959} 8960 8961/// ActOnField - Each field of a C struct/union is passed into this in order 8962/// to create a FieldDecl object for it. 8963Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8964 Declarator &D, Expr *BitfieldWidth) { 8965 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8966 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8967 /*HasInit=*/false, AS_public); 8968 return Res; 8969} 8970 8971/// HandleField - Analyze a field of a C struct or a C++ data member. 8972/// 8973FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8974 SourceLocation DeclStart, 8975 Declarator &D, Expr *BitWidth, bool HasInit, 8976 AccessSpecifier AS) { 8977 IdentifierInfo *II = D.getIdentifier(); 8978 SourceLocation Loc = DeclStart; 8979 if (II) Loc = D.getIdentifierLoc(); 8980 8981 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8982 QualType T = TInfo->getType(); 8983 if (getLangOpts().CPlusPlus) { 8984 CheckExtraCXXDefaultArguments(D); 8985 8986 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8987 UPPC_DataMemberType)) { 8988 D.setInvalidType(); 8989 T = Context.IntTy; 8990 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8991 } 8992 } 8993 8994 DiagnoseFunctionSpecifiers(D); 8995 8996 if (D.getDeclSpec().isThreadSpecified()) 8997 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8998 if (D.getDeclSpec().isConstexprSpecified()) 8999 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 9000 << 2; 9001 9002 // Check to see if this name was declared as a member previously 9003 NamedDecl *PrevDecl = 0; 9004 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 9005 LookupName(Previous, S); 9006 switch (Previous.getResultKind()) { 9007 case LookupResult::Found: 9008 case LookupResult::FoundUnresolvedValue: 9009 PrevDecl = Previous.getAsSingle<NamedDecl>(); 9010 break; 9011 9012 case LookupResult::FoundOverloaded: 9013 PrevDecl = Previous.getRepresentativeDecl(); 9014 break; 9015 9016 case LookupResult::NotFound: 9017 case LookupResult::NotFoundInCurrentInstantiation: 9018 case LookupResult::Ambiguous: 9019 break; 9020 } 9021 Previous.suppressDiagnostics(); 9022 9023 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9024 // Maybe we will complain about the shadowed template parameter. 9025 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9026 // Just pretend that we didn't see the previous declaration. 9027 PrevDecl = 0; 9028 } 9029 9030 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 9031 PrevDecl = 0; 9032 9033 bool Mutable 9034 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 9035 SourceLocation TSSL = D.getLocStart(); 9036 FieldDecl *NewFD 9037 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 9038 TSSL, AS, PrevDecl, &D); 9039 9040 if (NewFD->isInvalidDecl()) 9041 Record->setInvalidDecl(); 9042 9043 if (D.getDeclSpec().isModulePrivateSpecified()) 9044 NewFD->setModulePrivate(); 9045 9046 if (NewFD->isInvalidDecl() && PrevDecl) { 9047 // Don't introduce NewFD into scope; there's already something 9048 // with the same name in the same scope. 9049 } else if (II) { 9050 PushOnScopeChains(NewFD, S); 9051 } else 9052 Record->addDecl(NewFD); 9053 9054 return NewFD; 9055} 9056 9057/// \brief Build a new FieldDecl and check its well-formedness. 9058/// 9059/// This routine builds a new FieldDecl given the fields name, type, 9060/// record, etc. \p PrevDecl should refer to any previous declaration 9061/// with the same name and in the same scope as the field to be 9062/// created. 9063/// 9064/// \returns a new FieldDecl. 9065/// 9066/// \todo The Declarator argument is a hack. It will be removed once 9067FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 9068 TypeSourceInfo *TInfo, 9069 RecordDecl *Record, SourceLocation Loc, 9070 bool Mutable, Expr *BitWidth, bool HasInit, 9071 SourceLocation TSSL, 9072 AccessSpecifier AS, NamedDecl *PrevDecl, 9073 Declarator *D) { 9074 IdentifierInfo *II = Name.getAsIdentifierInfo(); 9075 bool InvalidDecl = false; 9076 if (D) InvalidDecl = D->isInvalidType(); 9077 9078 // If we receive a broken type, recover by assuming 'int' and 9079 // marking this declaration as invalid. 9080 if (T.isNull()) { 9081 InvalidDecl = true; 9082 T = Context.IntTy; 9083 } 9084 9085 QualType EltTy = Context.getBaseElementType(T); 9086 if (!EltTy->isDependentType()) { 9087 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 9088 // Fields of incomplete type force their record to be invalid. 9089 Record->setInvalidDecl(); 9090 InvalidDecl = true; 9091 } else { 9092 NamedDecl *Def; 9093 EltTy->isIncompleteType(&Def); 9094 if (Def && Def->isInvalidDecl()) { 9095 Record->setInvalidDecl(); 9096 InvalidDecl = true; 9097 } 9098 } 9099 } 9100 9101 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9102 // than a variably modified type. 9103 if (!InvalidDecl && T->isVariablyModifiedType()) { 9104 bool SizeIsNegative; 9105 llvm::APSInt Oversized; 9106 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 9107 SizeIsNegative, 9108 Oversized); 9109 if (!FixedTy.isNull()) { 9110 Diag(Loc, diag::warn_illegal_constant_array_size); 9111 T = FixedTy; 9112 } else { 9113 if (SizeIsNegative) 9114 Diag(Loc, diag::err_typecheck_negative_array_size); 9115 else if (Oversized.getBoolValue()) 9116 Diag(Loc, diag::err_array_too_large) 9117 << Oversized.toString(10); 9118 else 9119 Diag(Loc, diag::err_typecheck_field_variable_size); 9120 InvalidDecl = true; 9121 } 9122 } 9123 9124 // Fields can not have abstract class types 9125 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 9126 diag::err_abstract_type_in_decl, 9127 AbstractFieldType)) 9128 InvalidDecl = true; 9129 9130 bool ZeroWidth = false; 9131 // If this is declared as a bit-field, check the bit-field. 9132 if (!InvalidDecl && BitWidth) { 9133 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 9134 if (!BitWidth) { 9135 InvalidDecl = true; 9136 BitWidth = 0; 9137 ZeroWidth = false; 9138 } 9139 } 9140 9141 // Check that 'mutable' is consistent with the type of the declaration. 9142 if (!InvalidDecl && Mutable) { 9143 unsigned DiagID = 0; 9144 if (T->isReferenceType()) 9145 DiagID = diag::err_mutable_reference; 9146 else if (T.isConstQualified()) 9147 DiagID = diag::err_mutable_const; 9148 9149 if (DiagID) { 9150 SourceLocation ErrLoc = Loc; 9151 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 9152 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 9153 Diag(ErrLoc, DiagID); 9154 Mutable = false; 9155 InvalidDecl = true; 9156 } 9157 } 9158 9159 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 9160 BitWidth, Mutable, HasInit); 9161 if (InvalidDecl) 9162 NewFD->setInvalidDecl(); 9163 9164 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 9165 Diag(Loc, diag::err_duplicate_member) << II; 9166 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9167 NewFD->setInvalidDecl(); 9168 } 9169 9170 if (!InvalidDecl && getLangOpts().CPlusPlus) { 9171 if (Record->isUnion()) { 9172 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9173 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9174 if (RDecl->getDefinition()) { 9175 // C++ [class.union]p1: An object of a class with a non-trivial 9176 // constructor, a non-trivial copy constructor, a non-trivial 9177 // destructor, or a non-trivial copy assignment operator 9178 // cannot be a member of a union, nor can an array of such 9179 // objects. 9180 if (CheckNontrivialField(NewFD)) 9181 NewFD->setInvalidDecl(); 9182 } 9183 } 9184 9185 // C++ [class.union]p1: If a union contains a member of reference type, 9186 // the program is ill-formed. 9187 if (EltTy->isReferenceType()) { 9188 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 9189 << NewFD->getDeclName() << EltTy; 9190 NewFD->setInvalidDecl(); 9191 } 9192 } 9193 } 9194 9195 // FIXME: We need to pass in the attributes given an AST 9196 // representation, not a parser representation. 9197 if (D) 9198 // FIXME: What to pass instead of TUScope? 9199 ProcessDeclAttributes(TUScope, NewFD, *D); 9200 9201 // In auto-retain/release, infer strong retension for fields of 9202 // retainable type. 9203 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 9204 NewFD->setInvalidDecl(); 9205 9206 if (T.isObjCGCWeak()) 9207 Diag(Loc, diag::warn_attribute_weak_on_field); 9208 9209 NewFD->setAccess(AS); 9210 return NewFD; 9211} 9212 9213bool Sema::CheckNontrivialField(FieldDecl *FD) { 9214 assert(FD); 9215 assert(getLangOpts().CPlusPlus && "valid check only for C++"); 9216 9217 if (FD->isInvalidDecl()) 9218 return true; 9219 9220 QualType EltTy = Context.getBaseElementType(FD->getType()); 9221 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9222 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9223 if (RDecl->getDefinition()) { 9224 // We check for copy constructors before constructors 9225 // because otherwise we'll never get complaints about 9226 // copy constructors. 9227 9228 CXXSpecialMember member = CXXInvalid; 9229 if (!RDecl->hasTrivialCopyConstructor()) 9230 member = CXXCopyConstructor; 9231 else if (!RDecl->hasTrivialDefaultConstructor()) 9232 member = CXXDefaultConstructor; 9233 else if (!RDecl->hasTrivialCopyAssignment()) 9234 member = CXXCopyAssignment; 9235 else if (!RDecl->hasTrivialDestructor()) 9236 member = CXXDestructor; 9237 9238 if (member != CXXInvalid) { 9239 if (!getLangOpts().CPlusPlus0x && 9240 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) { 9241 // Objective-C++ ARC: it is an error to have a non-trivial field of 9242 // a union. However, system headers in Objective-C programs 9243 // occasionally have Objective-C lifetime objects within unions, 9244 // and rather than cause the program to fail, we make those 9245 // members unavailable. 9246 SourceLocation Loc = FD->getLocation(); 9247 if (getSourceManager().isInSystemHeader(Loc)) { 9248 if (!FD->hasAttr<UnavailableAttr>()) 9249 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 9250 "this system field has retaining ownership")); 9251 return false; 9252 } 9253 } 9254 9255 Diag(FD->getLocation(), getLangOpts().CPlusPlus0x ? 9256 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 9257 diag::err_illegal_union_or_anon_struct_member) 9258 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 9259 DiagnoseNontrivial(RT, member); 9260 return !getLangOpts().CPlusPlus0x; 9261 } 9262 } 9263 } 9264 9265 return false; 9266} 9267 9268/// If the given constructor is user-provided, produce a diagnostic explaining 9269/// that it makes the class non-trivial. 9270static bool DiagnoseNontrivialUserProvidedCtor(Sema &S, QualType QT, 9271 CXXConstructorDecl *CD, 9272 Sema::CXXSpecialMember CSM) { 9273 if (!CD->isUserProvided()) 9274 return false; 9275 9276 SourceLocation CtorLoc = CD->getLocation(); 9277 S.Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << CSM; 9278 return true; 9279} 9280 9281/// DiagnoseNontrivial - Given that a class has a non-trivial 9282/// special member, figure out why. 9283void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 9284 QualType QT(T, 0U); 9285 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 9286 9287 // Check whether the member was user-declared. 9288 switch (member) { 9289 case CXXInvalid: 9290 break; 9291 9292 case CXXDefaultConstructor: 9293 if (RD->hasUserDeclaredConstructor()) { 9294 typedef CXXRecordDecl::ctor_iterator ctor_iter; 9295 for (ctor_iter CI = RD->ctor_begin(), CE = RD->ctor_end(); CI != CE; ++CI) 9296 if (DiagnoseNontrivialUserProvidedCtor(*this, QT, *CI, member)) 9297 return; 9298 9299 // No user-provided constructors; look for constructor templates. 9300 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 9301 tmpl_iter; 9302 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); 9303 TI != TE; ++TI) { 9304 CXXConstructorDecl *CD = 9305 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()); 9306 if (CD && DiagnoseNontrivialUserProvidedCtor(*this, QT, CD, member)) 9307 return; 9308 } 9309 } 9310 break; 9311 9312 case CXXCopyConstructor: 9313 if (RD->hasUserDeclaredCopyConstructor()) { 9314 SourceLocation CtorLoc = 9315 RD->getCopyConstructor(0)->getLocation(); 9316 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9317 return; 9318 } 9319 break; 9320 9321 case CXXMoveConstructor: 9322 if (RD->hasUserDeclaredMoveConstructor()) { 9323 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 9324 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9325 return; 9326 } 9327 break; 9328 9329 case CXXCopyAssignment: 9330 if (RD->hasUserDeclaredCopyAssignment()) { 9331 // FIXME: this should use the location of the copy 9332 // assignment, not the type. 9333 SourceLocation TyLoc = RD->getLocStart(); 9334 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 9335 return; 9336 } 9337 break; 9338 9339 case CXXMoveAssignment: 9340 if (RD->hasUserDeclaredMoveAssignment()) { 9341 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 9342 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9343 return; 9344 } 9345 break; 9346 9347 case CXXDestructor: 9348 if (RD->hasUserDeclaredDestructor()) { 9349 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 9350 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9351 return; 9352 } 9353 break; 9354 } 9355 9356 typedef CXXRecordDecl::base_class_iterator base_iter; 9357 9358 // Virtual bases and members inhibit trivial copying/construction, 9359 // but not trivial destruction. 9360 if (member != CXXDestructor) { 9361 // Check for virtual bases. vbases includes indirect virtual bases, 9362 // so we just iterate through the direct bases. 9363 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 9364 if (bi->isVirtual()) { 9365 SourceLocation BaseLoc = bi->getLocStart(); 9366 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 9367 return; 9368 } 9369 9370 // Check for virtual methods. 9371 typedef CXXRecordDecl::method_iterator meth_iter; 9372 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 9373 ++mi) { 9374 if (mi->isVirtual()) { 9375 SourceLocation MLoc = mi->getLocStart(); 9376 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 9377 return; 9378 } 9379 } 9380 } 9381 9382 bool (CXXRecordDecl::*hasTrivial)() const; 9383 switch (member) { 9384 case CXXDefaultConstructor: 9385 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 9386 case CXXCopyConstructor: 9387 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 9388 case CXXCopyAssignment: 9389 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 9390 case CXXDestructor: 9391 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 9392 default: 9393 llvm_unreachable("unexpected special member"); 9394 } 9395 9396 // Check for nontrivial bases (and recurse). 9397 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 9398 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 9399 assert(BaseRT && "Don't know how to handle dependent bases"); 9400 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 9401 if (!(BaseRecTy->*hasTrivial)()) { 9402 SourceLocation BaseLoc = bi->getLocStart(); 9403 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 9404 DiagnoseNontrivial(BaseRT, member); 9405 return; 9406 } 9407 } 9408 9409 // Check for nontrivial members (and recurse). 9410 typedef RecordDecl::field_iterator field_iter; 9411 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 9412 ++fi) { 9413 QualType EltTy = Context.getBaseElementType(fi->getType()); 9414 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 9415 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 9416 9417 if (!(EltRD->*hasTrivial)()) { 9418 SourceLocation FLoc = fi->getLocation(); 9419 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 9420 DiagnoseNontrivial(EltRT, member); 9421 return; 9422 } 9423 } 9424 9425 if (EltTy->isObjCLifetimeType()) { 9426 switch (EltTy.getObjCLifetime()) { 9427 case Qualifiers::OCL_None: 9428 case Qualifiers::OCL_ExplicitNone: 9429 break; 9430 9431 case Qualifiers::OCL_Autoreleasing: 9432 case Qualifiers::OCL_Weak: 9433 case Qualifiers::OCL_Strong: 9434 Diag(fi->getLocation(), diag::note_nontrivial_objc_ownership) 9435 << QT << EltTy.getObjCLifetime(); 9436 return; 9437 } 9438 } 9439 } 9440 9441 llvm_unreachable("found no explanation for non-trivial member"); 9442} 9443 9444/// TranslateIvarVisibility - Translate visibility from a token ID to an 9445/// AST enum value. 9446static ObjCIvarDecl::AccessControl 9447TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9448 switch (ivarVisibility) { 9449 default: llvm_unreachable("Unknown visitibility kind"); 9450 case tok::objc_private: return ObjCIvarDecl::Private; 9451 case tok::objc_public: return ObjCIvarDecl::Public; 9452 case tok::objc_protected: return ObjCIvarDecl::Protected; 9453 case tok::objc_package: return ObjCIvarDecl::Package; 9454 } 9455} 9456 9457/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9458/// in order to create an IvarDecl object for it. 9459Decl *Sema::ActOnIvar(Scope *S, 9460 SourceLocation DeclStart, 9461 Declarator &D, Expr *BitfieldWidth, 9462 tok::ObjCKeywordKind Visibility) { 9463 9464 IdentifierInfo *II = D.getIdentifier(); 9465 Expr *BitWidth = (Expr*)BitfieldWidth; 9466 SourceLocation Loc = DeclStart; 9467 if (II) Loc = D.getIdentifierLoc(); 9468 9469 // FIXME: Unnamed fields can be handled in various different ways, for 9470 // example, unnamed unions inject all members into the struct namespace! 9471 9472 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9473 QualType T = TInfo->getType(); 9474 9475 if (BitWidth) { 9476 // 6.7.2.1p3, 6.7.2.1p4 9477 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9478 if (!BitWidth) 9479 D.setInvalidType(); 9480 } else { 9481 // Not a bitfield. 9482 9483 // validate II. 9484 9485 } 9486 if (T->isReferenceType()) { 9487 Diag(Loc, diag::err_ivar_reference_type); 9488 D.setInvalidType(); 9489 } 9490 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9491 // than a variably modified type. 9492 else if (T->isVariablyModifiedType()) { 9493 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9494 D.setInvalidType(); 9495 } 9496 9497 // Get the visibility (access control) for this ivar. 9498 ObjCIvarDecl::AccessControl ac = 9499 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9500 : ObjCIvarDecl::None; 9501 // Must set ivar's DeclContext to its enclosing interface. 9502 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9503 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9504 return 0; 9505 ObjCContainerDecl *EnclosingContext; 9506 if (ObjCImplementationDecl *IMPDecl = 9507 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9508 if (!LangOpts.ObjCNonFragileABI2) { 9509 // Case of ivar declared in an implementation. Context is that of its class. 9510 EnclosingContext = IMPDecl->getClassInterface(); 9511 assert(EnclosingContext && "Implementation has no class interface!"); 9512 } 9513 else 9514 EnclosingContext = EnclosingDecl; 9515 } else { 9516 if (ObjCCategoryDecl *CDecl = 9517 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9518 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9519 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9520 return 0; 9521 } 9522 } 9523 EnclosingContext = EnclosingDecl; 9524 } 9525 9526 // Construct the decl. 9527 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9528 DeclStart, Loc, II, T, 9529 TInfo, ac, (Expr *)BitfieldWidth); 9530 9531 if (II) { 9532 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9533 ForRedeclaration); 9534 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9535 && !isa<TagDecl>(PrevDecl)) { 9536 Diag(Loc, diag::err_duplicate_member) << II; 9537 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9538 NewID->setInvalidDecl(); 9539 } 9540 } 9541 9542 // Process attributes attached to the ivar. 9543 ProcessDeclAttributes(S, NewID, D); 9544 9545 if (D.isInvalidType()) 9546 NewID->setInvalidDecl(); 9547 9548 // In ARC, infer 'retaining' for ivars of retainable type. 9549 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9550 NewID->setInvalidDecl(); 9551 9552 if (D.getDeclSpec().isModulePrivateSpecified()) 9553 NewID->setModulePrivate(); 9554 9555 if (II) { 9556 // FIXME: When interfaces are DeclContexts, we'll need to add 9557 // these to the interface. 9558 S->AddDecl(NewID); 9559 IdResolver.AddDecl(NewID); 9560 } 9561 9562 if (LangOpts.ObjCNonFragileABI2 && 9563 !NewID->isInvalidDecl() && isa<ObjCInterfaceDecl>(EnclosingDecl)) 9564 Diag(Loc, diag::warn_ivars_in_interface); 9565 9566 return NewID; 9567} 9568 9569/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9570/// class and class extensions. For every class @interface and class 9571/// extension @interface, if the last ivar is a bitfield of any type, 9572/// then add an implicit `char :0` ivar to the end of that interface. 9573void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9574 SmallVectorImpl<Decl *> &AllIvarDecls) { 9575 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9576 return; 9577 9578 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9579 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9580 9581 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9582 return; 9583 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9584 if (!ID) { 9585 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9586 if (!CD->IsClassExtension()) 9587 return; 9588 } 9589 // No need to add this to end of @implementation. 9590 else 9591 return; 9592 } 9593 // All conditions are met. Add a new bitfield to the tail end of ivars. 9594 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9595 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9596 9597 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9598 DeclLoc, DeclLoc, 0, 9599 Context.CharTy, 9600 Context.getTrivialTypeSourceInfo(Context.CharTy, 9601 DeclLoc), 9602 ObjCIvarDecl::Private, BW, 9603 true); 9604 AllIvarDecls.push_back(Ivar); 9605} 9606 9607void Sema::ActOnFields(Scope* S, 9608 SourceLocation RecLoc, Decl *EnclosingDecl, 9609 llvm::ArrayRef<Decl *> Fields, 9610 SourceLocation LBrac, SourceLocation RBrac, 9611 AttributeList *Attr) { 9612 assert(EnclosingDecl && "missing record or interface decl"); 9613 9614 // If the decl this is being inserted into is invalid, then it may be a 9615 // redeclaration or some other bogus case. Don't try to add fields to it. 9616 if (EnclosingDecl->isInvalidDecl()) 9617 return; 9618 9619 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9620 9621 // Start counting up the number of named members; make sure to include 9622 // members of anonymous structs and unions in the total. 9623 unsigned NumNamedMembers = 0; 9624 if (Record) { 9625 for (RecordDecl::decl_iterator i = Record->decls_begin(), 9626 e = Record->decls_end(); i != e; i++) { 9627 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i)) 9628 if (IFD->getDeclName()) 9629 ++NumNamedMembers; 9630 } 9631 } 9632 9633 // Verify that all the fields are okay. 9634 SmallVector<FieldDecl*, 32> RecFields; 9635 9636 bool ARCErrReported = false; 9637 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9638 i != end; ++i) { 9639 FieldDecl *FD = cast<FieldDecl>(*i); 9640 9641 // Get the type for the field. 9642 const Type *FDTy = FD->getType().getTypePtr(); 9643 9644 if (!FD->isAnonymousStructOrUnion()) { 9645 // Remember all fields written by the user. 9646 RecFields.push_back(FD); 9647 } 9648 9649 // If the field is already invalid for some reason, don't emit more 9650 // diagnostics about it. 9651 if (FD->isInvalidDecl()) { 9652 EnclosingDecl->setInvalidDecl(); 9653 continue; 9654 } 9655 9656 // C99 6.7.2.1p2: 9657 // A structure or union shall not contain a member with 9658 // incomplete or function type (hence, a structure shall not 9659 // contain an instance of itself, but may contain a pointer to 9660 // an instance of itself), except that the last member of a 9661 // structure with more than one named member may have incomplete 9662 // array type; such a structure (and any union containing, 9663 // possibly recursively, a member that is such a structure) 9664 // shall not be a member of a structure or an element of an 9665 // array. 9666 if (FDTy->isFunctionType()) { 9667 // Field declared as a function. 9668 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9669 << FD->getDeclName(); 9670 FD->setInvalidDecl(); 9671 EnclosingDecl->setInvalidDecl(); 9672 continue; 9673 } else if (FDTy->isIncompleteArrayType() && Record && 9674 ((i + 1 == Fields.end() && !Record->isUnion()) || 9675 ((getLangOpts().MicrosoftExt || 9676 getLangOpts().CPlusPlus) && 9677 (i + 1 == Fields.end() || Record->isUnion())))) { 9678 // Flexible array member. 9679 // Microsoft and g++ is more permissive regarding flexible array. 9680 // It will accept flexible array in union and also 9681 // as the sole element of a struct/class. 9682 if (getLangOpts().MicrosoftExt) { 9683 if (Record->isUnion()) 9684 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9685 << FD->getDeclName(); 9686 else if (Fields.size() == 1) 9687 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9688 << FD->getDeclName() << Record->getTagKind(); 9689 } else if (getLangOpts().CPlusPlus) { 9690 if (Record->isUnion()) 9691 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9692 << FD->getDeclName(); 9693 else if (Fields.size() == 1) 9694 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9695 << FD->getDeclName() << Record->getTagKind(); 9696 } else if (!getLangOpts().C99) { 9697 if (Record->isUnion()) 9698 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9699 << FD->getDeclName(); 9700 else 9701 Diag(FD->getLocation(), diag::ext_c99_flexible_array_member) 9702 << FD->getDeclName() << Record->getTagKind(); 9703 } else if (NumNamedMembers < 1) { 9704 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9705 << FD->getDeclName(); 9706 FD->setInvalidDecl(); 9707 EnclosingDecl->setInvalidDecl(); 9708 continue; 9709 } 9710 if (!FD->getType()->isDependentType() && 9711 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9712 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9713 << FD->getDeclName() << FD->getType(); 9714 FD->setInvalidDecl(); 9715 EnclosingDecl->setInvalidDecl(); 9716 continue; 9717 } 9718 // Okay, we have a legal flexible array member at the end of the struct. 9719 if (Record) 9720 Record->setHasFlexibleArrayMember(true); 9721 } else if (!FDTy->isDependentType() && 9722 RequireCompleteType(FD->getLocation(), FD->getType(), 9723 diag::err_field_incomplete)) { 9724 // Incomplete type 9725 FD->setInvalidDecl(); 9726 EnclosingDecl->setInvalidDecl(); 9727 continue; 9728 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9729 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9730 // If this is a member of a union, then entire union becomes "flexible". 9731 if (Record && Record->isUnion()) { 9732 Record->setHasFlexibleArrayMember(true); 9733 } else { 9734 // If this is a struct/class and this is not the last element, reject 9735 // it. Note that GCC supports variable sized arrays in the middle of 9736 // structures. 9737 if (i + 1 != Fields.end()) 9738 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9739 << FD->getDeclName() << FD->getType(); 9740 else { 9741 // We support flexible arrays at the end of structs in 9742 // other structs as an extension. 9743 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9744 << FD->getDeclName(); 9745 if (Record) 9746 Record->setHasFlexibleArrayMember(true); 9747 } 9748 } 9749 } 9750 if (Record && FDTTy->getDecl()->hasObjectMember()) 9751 Record->setHasObjectMember(true); 9752 } else if (FDTy->isObjCObjectType()) { 9753 /// A field cannot be an Objective-c object 9754 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9755 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9756 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9757 FD->setType(T); 9758 } 9759 else if (!getLangOpts().CPlusPlus) { 9760 if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported) { 9761 // It's an error in ARC if a field has lifetime. 9762 // We don't want to report this in a system header, though, 9763 // so we just make the field unavailable. 9764 // FIXME: that's really not sufficient; we need to make the type 9765 // itself invalid to, say, initialize or copy. 9766 QualType T = FD->getType(); 9767 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9768 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9769 SourceLocation loc = FD->getLocation(); 9770 if (getSourceManager().isInSystemHeader(loc)) { 9771 if (!FD->hasAttr<UnavailableAttr>()) { 9772 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9773 "this system field has retaining ownership")); 9774 } 9775 } else { 9776 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9777 << T->isBlockPointerType(); 9778 } 9779 ARCErrReported = true; 9780 } 9781 } 9782 else if (getLangOpts().ObjC1 && 9783 getLangOpts().getGC() != LangOptions::NonGC && 9784 Record && !Record->hasObjectMember()) { 9785 if (FD->getType()->isObjCObjectPointerType() || 9786 FD->getType().isObjCGCStrong()) 9787 Record->setHasObjectMember(true); 9788 else if (Context.getAsArrayType(FD->getType())) { 9789 QualType BaseType = Context.getBaseElementType(FD->getType()); 9790 if (BaseType->isRecordType() && 9791 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9792 Record->setHasObjectMember(true); 9793 else if (BaseType->isObjCObjectPointerType() || 9794 BaseType.isObjCGCStrong()) 9795 Record->setHasObjectMember(true); 9796 } 9797 } 9798 } 9799 // Keep track of the number of named members. 9800 if (FD->getIdentifier()) 9801 ++NumNamedMembers; 9802 } 9803 9804 // Okay, we successfully defined 'Record'. 9805 if (Record) { 9806 bool Completed = false; 9807 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9808 if (!CXXRecord->isInvalidDecl()) { 9809 // Set access bits correctly on the directly-declared conversions. 9810 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9811 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9812 I != E; ++I) 9813 Convs->setAccess(I, (*I)->getAccess()); 9814 9815 if (!CXXRecord->isDependentType()) { 9816 // Objective-C Automatic Reference Counting: 9817 // If a class has a non-static data member of Objective-C pointer 9818 // type (or array thereof), it is a non-POD type and its 9819 // default constructor (if any), copy constructor, copy assignment 9820 // operator, and destructor are non-trivial. 9821 // 9822 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9823 // However, here we check whether this particular class is only 9824 // non-POD because of the presence of an Objective-C pointer member. 9825 // If so, objects of this type cannot be shared between code compiled 9826 // with instant objects and code compiled with manual retain/release. 9827 if (getLangOpts().ObjCAutoRefCount && 9828 CXXRecord->hasObjectMember() && 9829 CXXRecord->getLinkage() == ExternalLinkage) { 9830 if (CXXRecord->isPOD()) { 9831 Diag(CXXRecord->getLocation(), 9832 diag::warn_arc_non_pod_class_with_object_member) 9833 << CXXRecord; 9834 } else { 9835 // FIXME: Fix-Its would be nice here, but finding a good location 9836 // for them is going to be tricky. 9837 if (CXXRecord->hasTrivialCopyConstructor()) 9838 Diag(CXXRecord->getLocation(), 9839 diag::warn_arc_trivial_member_function_with_object_member) 9840 << CXXRecord << 0; 9841 if (CXXRecord->hasTrivialCopyAssignment()) 9842 Diag(CXXRecord->getLocation(), 9843 diag::warn_arc_trivial_member_function_with_object_member) 9844 << CXXRecord << 1; 9845 if (CXXRecord->hasTrivialDestructor()) 9846 Diag(CXXRecord->getLocation(), 9847 diag::warn_arc_trivial_member_function_with_object_member) 9848 << CXXRecord << 2; 9849 } 9850 } 9851 9852 // Adjust user-defined destructor exception spec. 9853 if (getLangOpts().CPlusPlus0x && 9854 CXXRecord->hasUserDeclaredDestructor()) 9855 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9856 9857 // Add any implicitly-declared members to this class. 9858 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9859 9860 // If we have virtual base classes, we may end up finding multiple 9861 // final overriders for a given virtual function. Check for this 9862 // problem now. 9863 if (CXXRecord->getNumVBases()) { 9864 CXXFinalOverriderMap FinalOverriders; 9865 CXXRecord->getFinalOverriders(FinalOverriders); 9866 9867 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9868 MEnd = FinalOverriders.end(); 9869 M != MEnd; ++M) { 9870 for (OverridingMethods::iterator SO = M->second.begin(), 9871 SOEnd = M->second.end(); 9872 SO != SOEnd; ++SO) { 9873 assert(SO->second.size() > 0 && 9874 "Virtual function without overridding functions?"); 9875 if (SO->second.size() == 1) 9876 continue; 9877 9878 // C++ [class.virtual]p2: 9879 // In a derived class, if a virtual member function of a base 9880 // class subobject has more than one final overrider the 9881 // program is ill-formed. 9882 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9883 << (NamedDecl *)M->first << Record; 9884 Diag(M->first->getLocation(), 9885 diag::note_overridden_virtual_function); 9886 for (OverridingMethods::overriding_iterator 9887 OM = SO->second.begin(), 9888 OMEnd = SO->second.end(); 9889 OM != OMEnd; ++OM) 9890 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9891 << (NamedDecl *)M->first << OM->Method->getParent(); 9892 9893 Record->setInvalidDecl(); 9894 } 9895 } 9896 CXXRecord->completeDefinition(&FinalOverriders); 9897 Completed = true; 9898 } 9899 } 9900 } 9901 } 9902 9903 if (!Completed) 9904 Record->completeDefinition(); 9905 9906 } else { 9907 ObjCIvarDecl **ClsFields = 9908 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9909 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9910 ID->setEndOfDefinitionLoc(RBrac); 9911 // Add ivar's to class's DeclContext. 9912 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9913 ClsFields[i]->setLexicalDeclContext(ID); 9914 ID->addDecl(ClsFields[i]); 9915 } 9916 // Must enforce the rule that ivars in the base classes may not be 9917 // duplicates. 9918 if (ID->getSuperClass()) 9919 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9920 } else if (ObjCImplementationDecl *IMPDecl = 9921 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9922 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9923 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9924 // Ivar declared in @implementation never belongs to the implementation. 9925 // Only it is in implementation's lexical context. 9926 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9927 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9928 IMPDecl->setIvarLBraceLoc(LBrac); 9929 IMPDecl->setIvarRBraceLoc(RBrac); 9930 } else if (ObjCCategoryDecl *CDecl = 9931 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9932 // case of ivars in class extension; all other cases have been 9933 // reported as errors elsewhere. 9934 // FIXME. Class extension does not have a LocEnd field. 9935 // CDecl->setLocEnd(RBrac); 9936 // Add ivar's to class extension's DeclContext. 9937 // Diagnose redeclaration of private ivars. 9938 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9939 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9940 if (IDecl) { 9941 if (const ObjCIvarDecl *ClsIvar = 9942 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9943 Diag(ClsFields[i]->getLocation(), 9944 diag::err_duplicate_ivar_declaration); 9945 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9946 continue; 9947 } 9948 for (const ObjCCategoryDecl *ClsExtDecl = 9949 IDecl->getFirstClassExtension(); 9950 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9951 if (const ObjCIvarDecl *ClsExtIvar = 9952 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9953 Diag(ClsFields[i]->getLocation(), 9954 diag::err_duplicate_ivar_declaration); 9955 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9956 continue; 9957 } 9958 } 9959 } 9960 ClsFields[i]->setLexicalDeclContext(CDecl); 9961 CDecl->addDecl(ClsFields[i]); 9962 } 9963 CDecl->setIvarLBraceLoc(LBrac); 9964 CDecl->setIvarRBraceLoc(RBrac); 9965 } 9966 } 9967 9968 if (Attr) 9969 ProcessDeclAttributeList(S, Record, Attr); 9970 9971 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9972 // set the visibility of this record. 9973 if (Record && !Record->getDeclContext()->isRecord()) 9974 AddPushedVisibilityAttribute(Record); 9975} 9976 9977/// \brief Determine whether the given integral value is representable within 9978/// the given type T. 9979static bool isRepresentableIntegerValue(ASTContext &Context, 9980 llvm::APSInt &Value, 9981 QualType T) { 9982 assert(T->isIntegralType(Context) && "Integral type required!"); 9983 unsigned BitWidth = Context.getIntWidth(T); 9984 9985 if (Value.isUnsigned() || Value.isNonNegative()) { 9986 if (T->isSignedIntegerOrEnumerationType()) 9987 --BitWidth; 9988 return Value.getActiveBits() <= BitWidth; 9989 } 9990 return Value.getMinSignedBits() <= BitWidth; 9991} 9992 9993// \brief Given an integral type, return the next larger integral type 9994// (or a NULL type of no such type exists). 9995static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9996 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9997 // enum checking below. 9998 assert(T->isIntegralType(Context) && "Integral type required!"); 9999 const unsigned NumTypes = 4; 10000 QualType SignedIntegralTypes[NumTypes] = { 10001 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 10002 }; 10003 QualType UnsignedIntegralTypes[NumTypes] = { 10004 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 10005 Context.UnsignedLongLongTy 10006 }; 10007 10008 unsigned BitWidth = Context.getTypeSize(T); 10009 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 10010 : UnsignedIntegralTypes; 10011 for (unsigned I = 0; I != NumTypes; ++I) 10012 if (Context.getTypeSize(Types[I]) > BitWidth) 10013 return Types[I]; 10014 10015 return QualType(); 10016} 10017 10018EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 10019 EnumConstantDecl *LastEnumConst, 10020 SourceLocation IdLoc, 10021 IdentifierInfo *Id, 10022 Expr *Val) { 10023 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10024 llvm::APSInt EnumVal(IntWidth); 10025 QualType EltTy; 10026 10027 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 10028 Val = 0; 10029 10030 if (Val) 10031 Val = DefaultLvalueConversion(Val).take(); 10032 10033 if (Val) { 10034 if (Enum->isDependentType() || Val->isTypeDependent()) 10035 EltTy = Context.DependentTy; 10036 else { 10037 SourceLocation ExpLoc; 10038 if (getLangOpts().CPlusPlus0x && Enum->isFixed() && 10039 !getLangOpts().MicrosoftMode) { 10040 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 10041 // constant-expression in the enumerator-definition shall be a converted 10042 // constant expression of the underlying type. 10043 EltTy = Enum->getIntegerType(); 10044 ExprResult Converted = 10045 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 10046 CCEK_Enumerator); 10047 if (Converted.isInvalid()) 10048 Val = 0; 10049 else 10050 Val = Converted.take(); 10051 } else if (!Val->isValueDependent() && 10052 !(Val = VerifyIntegerConstantExpression(Val, 10053 &EnumVal).take())) { 10054 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 10055 } else { 10056 if (Enum->isFixed()) { 10057 EltTy = Enum->getIntegerType(); 10058 10059 // In Obj-C and Microsoft mode, require the enumeration value to be 10060 // representable in the underlying type of the enumeration. In C++11, 10061 // we perform a non-narrowing conversion as part of converted constant 10062 // expression checking. 10063 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10064 if (getLangOpts().MicrosoftMode) { 10065 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 10066 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10067 } else 10068 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 10069 } else 10070 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 10071 } else if (getLangOpts().CPlusPlus) { 10072 // C++11 [dcl.enum]p5: 10073 // If the underlying type is not fixed, the type of each enumerator 10074 // is the type of its initializing value: 10075 // - If an initializer is specified for an enumerator, the 10076 // initializing value has the same type as the expression. 10077 EltTy = Val->getType(); 10078 } else { 10079 // C99 6.7.2.2p2: 10080 // The expression that defines the value of an enumeration constant 10081 // shall be an integer constant expression that has a value 10082 // representable as an int. 10083 10084 // Complain if the value is not representable in an int. 10085 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 10086 Diag(IdLoc, diag::ext_enum_value_not_int) 10087 << EnumVal.toString(10) << Val->getSourceRange() 10088 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 10089 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 10090 // Force the type of the expression to 'int'. 10091 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 10092 } 10093 EltTy = Val->getType(); 10094 } 10095 } 10096 } 10097 } 10098 10099 if (!Val) { 10100 if (Enum->isDependentType()) 10101 EltTy = Context.DependentTy; 10102 else if (!LastEnumConst) { 10103 // C++0x [dcl.enum]p5: 10104 // If the underlying type is not fixed, the type of each enumerator 10105 // is the type of its initializing value: 10106 // - If no initializer is specified for the first enumerator, the 10107 // initializing value has an unspecified integral type. 10108 // 10109 // GCC uses 'int' for its unspecified integral type, as does 10110 // C99 6.7.2.2p3. 10111 if (Enum->isFixed()) { 10112 EltTy = Enum->getIntegerType(); 10113 } 10114 else { 10115 EltTy = Context.IntTy; 10116 } 10117 } else { 10118 // Assign the last value + 1. 10119 EnumVal = LastEnumConst->getInitVal(); 10120 ++EnumVal; 10121 EltTy = LastEnumConst->getType(); 10122 10123 // Check for overflow on increment. 10124 if (EnumVal < LastEnumConst->getInitVal()) { 10125 // C++0x [dcl.enum]p5: 10126 // If the underlying type is not fixed, the type of each enumerator 10127 // is the type of its initializing value: 10128 // 10129 // - Otherwise the type of the initializing value is the same as 10130 // the type of the initializing value of the preceding enumerator 10131 // unless the incremented value is not representable in that type, 10132 // in which case the type is an unspecified integral type 10133 // sufficient to contain the incremented value. If no such type 10134 // exists, the program is ill-formed. 10135 QualType T = getNextLargerIntegralType(Context, EltTy); 10136 if (T.isNull() || Enum->isFixed()) { 10137 // There is no integral type larger enough to represent this 10138 // value. Complain, then allow the value to wrap around. 10139 EnumVal = LastEnumConst->getInitVal(); 10140 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 10141 ++EnumVal; 10142 if (Enum->isFixed()) 10143 // When the underlying type is fixed, this is ill-formed. 10144 Diag(IdLoc, diag::err_enumerator_wrapped) 10145 << EnumVal.toString(10) 10146 << EltTy; 10147 else 10148 Diag(IdLoc, diag::warn_enumerator_too_large) 10149 << EnumVal.toString(10); 10150 } else { 10151 EltTy = T; 10152 } 10153 10154 // Retrieve the last enumerator's value, extent that type to the 10155 // type that is supposed to be large enough to represent the incremented 10156 // value, then increment. 10157 EnumVal = LastEnumConst->getInitVal(); 10158 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10159 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 10160 ++EnumVal; 10161 10162 // If we're not in C++, diagnose the overflow of enumerator values, 10163 // which in C99 means that the enumerator value is not representable in 10164 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 10165 // permits enumerator values that are representable in some larger 10166 // integral type. 10167 if (!getLangOpts().CPlusPlus && !T.isNull()) 10168 Diag(IdLoc, diag::warn_enum_value_overflow); 10169 } else if (!getLangOpts().CPlusPlus && 10170 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10171 // Enforce C99 6.7.2.2p2 even when we compute the next value. 10172 Diag(IdLoc, diag::ext_enum_value_not_int) 10173 << EnumVal.toString(10) << 1; 10174 } 10175 } 10176 } 10177 10178 if (!EltTy->isDependentType()) { 10179 // Make the enumerator value match the signedness and size of the 10180 // enumerator's type. 10181 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); 10182 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10183 } 10184 10185 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 10186 Val, EnumVal); 10187} 10188 10189 10190Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 10191 SourceLocation IdLoc, IdentifierInfo *Id, 10192 AttributeList *Attr, 10193 SourceLocation EqualLoc, Expr *Val) { 10194 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 10195 EnumConstantDecl *LastEnumConst = 10196 cast_or_null<EnumConstantDecl>(lastEnumConst); 10197 10198 // The scope passed in may not be a decl scope. Zip up the scope tree until 10199 // we find one that is. 10200 S = getNonFieldDeclScope(S); 10201 10202 // Verify that there isn't already something declared with this name in this 10203 // scope. 10204 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 10205 ForRedeclaration); 10206 if (PrevDecl && PrevDecl->isTemplateParameter()) { 10207 // Maybe we will complain about the shadowed template parameter. 10208 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 10209 // Just pretend that we didn't see the previous declaration. 10210 PrevDecl = 0; 10211 } 10212 10213 if (PrevDecl) { 10214 // When in C++, we may get a TagDecl with the same name; in this case the 10215 // enum constant will 'hide' the tag. 10216 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 10217 "Received TagDecl when not in C++!"); 10218 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 10219 if (isa<EnumConstantDecl>(PrevDecl)) 10220 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 10221 else 10222 Diag(IdLoc, diag::err_redefinition) << Id; 10223 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 10224 return 0; 10225 } 10226 } 10227 10228 // C++ [class.mem]p13: 10229 // If T is the name of a class, then each of the following shall have a 10230 // name different from T: 10231 // - every enumerator of every member of class T that is an enumerated 10232 // type 10233 if (CXXRecordDecl *Record 10234 = dyn_cast<CXXRecordDecl>( 10235 TheEnumDecl->getDeclContext()->getRedeclContext())) 10236 if (Record->getIdentifier() && Record->getIdentifier() == Id) 10237 Diag(IdLoc, diag::err_member_name_of_class) << Id; 10238 10239 EnumConstantDecl *New = 10240 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 10241 10242 if (New) { 10243 // Process attributes. 10244 if (Attr) ProcessDeclAttributeList(S, New, Attr); 10245 10246 // Register this decl in the current scope stack. 10247 New->setAccess(TheEnumDecl->getAccess()); 10248 PushOnScopeChains(New, S); 10249 } 10250 10251 return New; 10252} 10253 10254// Emits a warning if every element in the enum is the same value and if 10255// every element is initialized with a integer or boolean literal. 10256static void CheckForUniqueEnumValues(Sema &S, Decl **Elements, 10257 unsigned NumElements, EnumDecl *Enum, 10258 QualType EnumType) { 10259 if (S.Diags.getDiagnosticLevel(diag::warn_identical_enum_values, 10260 Enum->getLocation()) == 10261 DiagnosticsEngine::Ignored) 10262 return; 10263 10264 if (NumElements < 2) 10265 return; 10266 10267 if (!Enum->getIdentifier()) 10268 return; 10269 10270 llvm::APSInt FirstVal; 10271 10272 for (unsigned i = 0; i != NumElements; ++i) { 10273 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10274 if (!ECD) 10275 return; 10276 10277 Expr *InitExpr = ECD->getInitExpr(); 10278 if (!InitExpr) 10279 return; 10280 InitExpr = InitExpr->IgnoreImpCasts(); 10281 if (!isa<IntegerLiteral>(InitExpr) && !isa<CXXBoolLiteralExpr>(InitExpr)) 10282 return; 10283 10284 if (i == 0) { 10285 FirstVal = ECD->getInitVal(); 10286 continue; 10287 } 10288 10289 if (FirstVal != ECD->getInitVal()) 10290 return; 10291 } 10292 10293 S.Diag(Enum->getLocation(), diag::warn_identical_enum_values) 10294 << EnumType << FirstVal.toString(10) 10295 << Enum->getSourceRange(); 10296} 10297 10298void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 10299 SourceLocation RBraceLoc, Decl *EnumDeclX, 10300 Decl **Elements, unsigned NumElements, 10301 Scope *S, AttributeList *Attr) { 10302 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 10303 QualType EnumType = Context.getTypeDeclType(Enum); 10304 10305 if (Attr) 10306 ProcessDeclAttributeList(S, Enum, Attr); 10307 10308 if (Enum->isDependentType()) { 10309 for (unsigned i = 0; i != NumElements; ++i) { 10310 EnumConstantDecl *ECD = 10311 cast_or_null<EnumConstantDecl>(Elements[i]); 10312 if (!ECD) continue; 10313 10314 ECD->setType(EnumType); 10315 } 10316 10317 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 10318 return; 10319 } 10320 10321 // TODO: If the result value doesn't fit in an int, it must be a long or long 10322 // long value. ISO C does not support this, but GCC does as an extension, 10323 // emit a warning. 10324 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10325 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 10326 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 10327 10328 // Verify that all the values are okay, compute the size of the values, and 10329 // reverse the list. 10330 unsigned NumNegativeBits = 0; 10331 unsigned NumPositiveBits = 0; 10332 10333 // Keep track of whether all elements have type int. 10334 bool AllElementsInt = true; 10335 10336 for (unsigned i = 0; i != NumElements; ++i) { 10337 EnumConstantDecl *ECD = 10338 cast_or_null<EnumConstantDecl>(Elements[i]); 10339 if (!ECD) continue; // Already issued a diagnostic. 10340 10341 const llvm::APSInt &InitVal = ECD->getInitVal(); 10342 10343 // Keep track of the size of positive and negative values. 10344 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 10345 NumPositiveBits = std::max(NumPositiveBits, 10346 (unsigned)InitVal.getActiveBits()); 10347 else 10348 NumNegativeBits = std::max(NumNegativeBits, 10349 (unsigned)InitVal.getMinSignedBits()); 10350 10351 // Keep track of whether every enum element has type int (very commmon). 10352 if (AllElementsInt) 10353 AllElementsInt = ECD->getType() == Context.IntTy; 10354 } 10355 10356 // Figure out the type that should be used for this enum. 10357 QualType BestType; 10358 unsigned BestWidth; 10359 10360 // C++0x N3000 [conv.prom]p3: 10361 // An rvalue of an unscoped enumeration type whose underlying 10362 // type is not fixed can be converted to an rvalue of the first 10363 // of the following types that can represent all the values of 10364 // the enumeration: int, unsigned int, long int, unsigned long 10365 // int, long long int, or unsigned long long int. 10366 // C99 6.4.4.3p2: 10367 // An identifier declared as an enumeration constant has type int. 10368 // The C99 rule is modified by a gcc extension 10369 QualType BestPromotionType; 10370 10371 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 10372 // -fshort-enums is the equivalent to specifying the packed attribute on all 10373 // enum definitions. 10374 if (LangOpts.ShortEnums) 10375 Packed = true; 10376 10377 if (Enum->isFixed()) { 10378 BestType = Enum->getIntegerType(); 10379 if (BestType->isPromotableIntegerType()) 10380 BestPromotionType = Context.getPromotedIntegerType(BestType); 10381 else 10382 BestPromotionType = BestType; 10383 // We don't need to set BestWidth, because BestType is going to be the type 10384 // of the enumerators, but we do anyway because otherwise some compilers 10385 // warn that it might be used uninitialized. 10386 BestWidth = CharWidth; 10387 } 10388 else if (NumNegativeBits) { 10389 // If there is a negative value, figure out the smallest integer type (of 10390 // int/long/longlong) that fits. 10391 // If it's packed, check also if it fits a char or a short. 10392 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 10393 BestType = Context.SignedCharTy; 10394 BestWidth = CharWidth; 10395 } else if (Packed && NumNegativeBits <= ShortWidth && 10396 NumPositiveBits < ShortWidth) { 10397 BestType = Context.ShortTy; 10398 BestWidth = ShortWidth; 10399 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 10400 BestType = Context.IntTy; 10401 BestWidth = IntWidth; 10402 } else { 10403 BestWidth = Context.getTargetInfo().getLongWidth(); 10404 10405 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 10406 BestType = Context.LongTy; 10407 } else { 10408 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10409 10410 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 10411 Diag(Enum->getLocation(), diag::warn_enum_too_large); 10412 BestType = Context.LongLongTy; 10413 } 10414 } 10415 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 10416 } else { 10417 // If there is no negative value, figure out the smallest type that fits 10418 // all of the enumerator values. 10419 // If it's packed, check also if it fits a char or a short. 10420 if (Packed && NumPositiveBits <= CharWidth) { 10421 BestType = Context.UnsignedCharTy; 10422 BestPromotionType = Context.IntTy; 10423 BestWidth = CharWidth; 10424 } else if (Packed && NumPositiveBits <= ShortWidth) { 10425 BestType = Context.UnsignedShortTy; 10426 BestPromotionType = Context.IntTy; 10427 BestWidth = ShortWidth; 10428 } else if (NumPositiveBits <= IntWidth) { 10429 BestType = Context.UnsignedIntTy; 10430 BestWidth = IntWidth; 10431 BestPromotionType 10432 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10433 ? Context.UnsignedIntTy : Context.IntTy; 10434 } else if (NumPositiveBits <= 10435 (BestWidth = Context.getTargetInfo().getLongWidth())) { 10436 BestType = Context.UnsignedLongTy; 10437 BestPromotionType 10438 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10439 ? Context.UnsignedLongTy : Context.LongTy; 10440 } else { 10441 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10442 assert(NumPositiveBits <= BestWidth && 10443 "How could an initializer get larger than ULL?"); 10444 BestType = Context.UnsignedLongLongTy; 10445 BestPromotionType 10446 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10447 ? Context.UnsignedLongLongTy : Context.LongLongTy; 10448 } 10449 } 10450 10451 // Loop over all of the enumerator constants, changing their types to match 10452 // the type of the enum if needed. 10453 for (unsigned i = 0; i != NumElements; ++i) { 10454 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10455 if (!ECD) continue; // Already issued a diagnostic. 10456 10457 // Standard C says the enumerators have int type, but we allow, as an 10458 // extension, the enumerators to be larger than int size. If each 10459 // enumerator value fits in an int, type it as an int, otherwise type it the 10460 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 10461 // that X has type 'int', not 'unsigned'. 10462 10463 // Determine whether the value fits into an int. 10464 llvm::APSInt InitVal = ECD->getInitVal(); 10465 10466 // If it fits into an integer type, force it. Otherwise force it to match 10467 // the enum decl type. 10468 QualType NewTy; 10469 unsigned NewWidth; 10470 bool NewSign; 10471 if (!getLangOpts().CPlusPlus && 10472 !Enum->isFixed() && 10473 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 10474 NewTy = Context.IntTy; 10475 NewWidth = IntWidth; 10476 NewSign = true; 10477 } else if (ECD->getType() == BestType) { 10478 // Already the right type! 10479 if (getLangOpts().CPlusPlus) 10480 // C++ [dcl.enum]p4: Following the closing brace of an 10481 // enum-specifier, each enumerator has the type of its 10482 // enumeration. 10483 ECD->setType(EnumType); 10484 continue; 10485 } else { 10486 NewTy = BestType; 10487 NewWidth = BestWidth; 10488 NewSign = BestType->isSignedIntegerOrEnumerationType(); 10489 } 10490 10491 // Adjust the APSInt value. 10492 InitVal = InitVal.extOrTrunc(NewWidth); 10493 InitVal.setIsSigned(NewSign); 10494 ECD->setInitVal(InitVal); 10495 10496 // Adjust the Expr initializer and type. 10497 if (ECD->getInitExpr() && 10498 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10499 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10500 CK_IntegralCast, 10501 ECD->getInitExpr(), 10502 /*base paths*/ 0, 10503 VK_RValue)); 10504 if (getLangOpts().CPlusPlus) 10505 // C++ [dcl.enum]p4: Following the closing brace of an 10506 // enum-specifier, each enumerator has the type of its 10507 // enumeration. 10508 ECD->setType(EnumType); 10509 else 10510 ECD->setType(NewTy); 10511 } 10512 10513 Enum->completeDefinition(BestType, BestPromotionType, 10514 NumPositiveBits, NumNegativeBits); 10515 10516 // If we're declaring a function, ensure this decl isn't forgotten about - 10517 // it needs to go into the function scope. 10518 if (InFunctionDeclarator) 10519 DeclsInPrototypeScope.push_back(Enum); 10520 10521 CheckForUniqueEnumValues(*this, Elements, NumElements, Enum, EnumType); 10522} 10523 10524Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10525 SourceLocation StartLoc, 10526 SourceLocation EndLoc) { 10527 StringLiteral *AsmString = cast<StringLiteral>(expr); 10528 10529 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10530 AsmString, StartLoc, 10531 EndLoc); 10532 CurContext->addDecl(New); 10533 return New; 10534} 10535 10536DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10537 SourceLocation ImportLoc, 10538 ModuleIdPath Path) { 10539 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10540 Module::AllVisible, 10541 /*IsIncludeDirective=*/false); 10542 if (!Mod) 10543 return true; 10544 10545 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10546 Module *ModCheck = Mod; 10547 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10548 // If we've run out of module parents, just drop the remaining identifiers. 10549 // We need the length to be consistent. 10550 if (!ModCheck) 10551 break; 10552 ModCheck = ModCheck->Parent; 10553 10554 IdentifierLocs.push_back(Path[I].second); 10555 } 10556 10557 ImportDecl *Import = ImportDecl::Create(Context, 10558 Context.getTranslationUnitDecl(), 10559 AtLoc.isValid()? AtLoc : ImportLoc, 10560 Mod, IdentifierLocs); 10561 Context.getTranslationUnitDecl()->addDecl(Import); 10562 return Import; 10563} 10564 10565void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name, 10566 IdentifierInfo* AliasName, 10567 SourceLocation PragmaLoc, 10568 SourceLocation NameLoc, 10569 SourceLocation AliasNameLoc) { 10570 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, 10571 LookupOrdinaryName); 10572 AsmLabelAttr *Attr = 10573 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName()); 10574 10575 if (PrevDecl) 10576 PrevDecl->addAttr(Attr); 10577 else 10578 (void)ExtnameUndeclaredIdentifiers.insert( 10579 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr)); 10580} 10581 10582void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10583 SourceLocation PragmaLoc, 10584 SourceLocation NameLoc) { 10585 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10586 10587 if (PrevDecl) { 10588 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10589 } else { 10590 (void)WeakUndeclaredIdentifiers.insert( 10591 std::pair<IdentifierInfo*,WeakInfo> 10592 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10593 } 10594} 10595 10596void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10597 IdentifierInfo* AliasName, 10598 SourceLocation PragmaLoc, 10599 SourceLocation NameLoc, 10600 SourceLocation AliasNameLoc) { 10601 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10602 LookupOrdinaryName); 10603 WeakInfo W = WeakInfo(Name, NameLoc); 10604 10605 if (PrevDecl) { 10606 if (!PrevDecl->hasAttr<AliasAttr>()) 10607 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10608 DeclApplyPragmaWeak(TUScope, ND, W); 10609 } else { 10610 (void)WeakUndeclaredIdentifiers.insert( 10611 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10612 } 10613} 10614 10615Decl *Sema::getObjCDeclContext() const { 10616 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10617} 10618 10619AvailabilityResult Sema::getCurContextAvailability() const { 10620 const Decl *D = cast<Decl>(getCurLexicalContext()); 10621 // A category implicitly has the availability of the interface. 10622 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10623 D = CatD->getClassInterface(); 10624 10625 return D->getAvailability(); 10626} 10627