SemaDecl.cpp revision 9cda03ff7fc40b727d0cc44b1702dbae09d63f42
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) 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 473Sema::NameClassification Sema::ClassifyName(Scope *S, 474 CXXScopeSpec &SS, 475 IdentifierInfo *&Name, 476 SourceLocation NameLoc, 477 const Token &NextToken) { 478 DeclarationNameInfo NameInfo(Name, NameLoc); 479 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 480 481 if (NextToken.is(tok::coloncolon)) { 482 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 483 QualType(), false, SS, 0, false); 484 485 } 486 487 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 488 LookupParsedName(Result, S, &SS, !CurMethod); 489 490 // Perform lookup for Objective-C instance variables (including automatically 491 // synthesized instance variables), if we're in an Objective-C method. 492 // FIXME: This lookup really, really needs to be folded in to the normal 493 // unqualified lookup mechanism. 494 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 495 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 496 if (E.get() || E.isInvalid()) 497 return E; 498 } 499 500 bool SecondTry = false; 501 bool IsFilteredTemplateName = false; 502 503Corrected: 504 switch (Result.getResultKind()) { 505 case LookupResult::NotFound: 506 // If an unqualified-id is followed by a '(', then we have a function 507 // call. 508 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 509 // In C++, this is an ADL-only call. 510 // FIXME: Reference? 511 if (getLangOpts().CPlusPlus) 512 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 513 514 // C90 6.3.2.2: 515 // If the expression that precedes the parenthesized argument list in a 516 // function call consists solely of an identifier, and if no 517 // declaration is visible for this identifier, the identifier is 518 // implicitly declared exactly as if, in the innermost block containing 519 // the function call, the declaration 520 // 521 // extern int identifier (); 522 // 523 // appeared. 524 // 525 // We also allow this in C99 as an extension. 526 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 527 Result.addDecl(D); 528 Result.resolveKind(); 529 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 530 } 531 } 532 533 // In C, we first see whether there is a tag type by the same name, in 534 // which case it's likely that the user just forget to write "enum", 535 // "struct", or "union". 536 if (!getLangOpts().CPlusPlus && !SecondTry) { 537 Result.clear(LookupTagName); 538 LookupParsedName(Result, S, &SS); 539 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 540 const char *TagName = 0; 541 const char *FixItTagName = 0; 542 switch (Tag->getTagKind()) { 543 case TTK_Class: 544 TagName = "class"; 545 FixItTagName = "class "; 546 break; 547 548 case TTK_Enum: 549 TagName = "enum"; 550 FixItTagName = "enum "; 551 break; 552 553 case TTK_Struct: 554 TagName = "struct"; 555 FixItTagName = "struct "; 556 break; 557 558 case TTK_Union: 559 TagName = "union"; 560 FixItTagName = "union "; 561 break; 562 } 563 564 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 565 << Name << TagName << getLangOpts().CPlusPlus 566 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 567 break; 568 } 569 570 Result.clear(LookupOrdinaryName); 571 } 572 573 // Perform typo correction to determine if there is another name that is 574 // close to this name. 575 if (!SecondTry) { 576 SecondTry = true; 577 CorrectionCandidateCallback DefaultValidator; 578 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 579 Result.getLookupKind(), S, 580 &SS, DefaultValidator)) { 581 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 582 unsigned QualifiedDiag = diag::err_no_member_suggest; 583 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 584 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 585 586 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 587 NamedDecl *UnderlyingFirstDecl 588 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 589 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 590 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 591 UnqualifiedDiag = diag::err_no_template_suggest; 592 QualifiedDiag = diag::err_no_member_template_suggest; 593 } else if (UnderlyingFirstDecl && 594 (isa<TypeDecl>(UnderlyingFirstDecl) || 595 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 596 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 597 UnqualifiedDiag = diag::err_unknown_typename_suggest; 598 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 599 } 600 601 if (SS.isEmpty()) 602 Diag(NameLoc, UnqualifiedDiag) 603 << Name << CorrectedQuotedStr 604 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 605 else 606 Diag(NameLoc, QualifiedDiag) 607 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 608 << SS.getRange() 609 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 610 611 // Update the name, so that the caller has the new name. 612 Name = Corrected.getCorrectionAsIdentifierInfo(); 613 614 // Typo correction corrected to a keyword. 615 if (Corrected.isKeyword()) 616 return Corrected.getCorrectionAsIdentifierInfo(); 617 618 // Also update the LookupResult... 619 // FIXME: This should probably go away at some point 620 Result.clear(); 621 Result.setLookupName(Corrected.getCorrection()); 622 if (FirstDecl) { 623 Result.addDecl(FirstDecl); 624 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 625 << CorrectedQuotedStr; 626 } 627 628 // If we found an Objective-C instance variable, let 629 // LookupInObjCMethod build the appropriate expression to 630 // reference the ivar. 631 // FIXME: This is a gross hack. 632 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 633 Result.clear(); 634 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 635 return move(E); 636 } 637 638 goto Corrected; 639 } 640 } 641 642 // We failed to correct; just fall through and let the parser deal with it. 643 Result.suppressDiagnostics(); 644 return NameClassification::Unknown(); 645 646 case LookupResult::NotFoundInCurrentInstantiation: { 647 // We performed name lookup into the current instantiation, and there were 648 // dependent bases, so we treat this result the same way as any other 649 // dependent nested-name-specifier. 650 651 // C++ [temp.res]p2: 652 // A name used in a template declaration or definition and that is 653 // dependent on a template-parameter is assumed not to name a type 654 // unless the applicable name lookup finds a type name or the name is 655 // qualified by the keyword typename. 656 // 657 // FIXME: If the next token is '<', we might want to ask the parser to 658 // perform some heroics to see if we actually have a 659 // template-argument-list, which would indicate a missing 'template' 660 // keyword here. 661 return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(), 662 NameInfo, /*TemplateArgs=*/0); 663 } 664 665 case LookupResult::Found: 666 case LookupResult::FoundOverloaded: 667 case LookupResult::FoundUnresolvedValue: 668 break; 669 670 case LookupResult::Ambiguous: 671 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 672 hasAnyAcceptableTemplateNames(Result)) { 673 // C++ [temp.local]p3: 674 // A lookup that finds an injected-class-name (10.2) can result in an 675 // ambiguity in certain cases (for example, if it is found in more than 676 // one base class). If all of the injected-class-names that are found 677 // refer to specializations of the same class template, and if the name 678 // is followed by a template-argument-list, the reference refers to the 679 // class template itself and not a specialization thereof, and is not 680 // ambiguous. 681 // 682 // This filtering can make an ambiguous result into an unambiguous one, 683 // so try again after filtering out template names. 684 FilterAcceptableTemplateNames(Result); 685 if (!Result.isAmbiguous()) { 686 IsFilteredTemplateName = true; 687 break; 688 } 689 } 690 691 // Diagnose the ambiguity and return an error. 692 return NameClassification::Error(); 693 } 694 695 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 696 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 697 // C++ [temp.names]p3: 698 // After name lookup (3.4) finds that a name is a template-name or that 699 // an operator-function-id or a literal- operator-id refers to a set of 700 // overloaded functions any member of which is a function template if 701 // this is followed by a <, the < is always taken as the delimiter of a 702 // template-argument-list and never as the less-than operator. 703 if (!IsFilteredTemplateName) 704 FilterAcceptableTemplateNames(Result); 705 706 if (!Result.empty()) { 707 bool IsFunctionTemplate; 708 TemplateName Template; 709 if (Result.end() - Result.begin() > 1) { 710 IsFunctionTemplate = true; 711 Template = Context.getOverloadedTemplateName(Result.begin(), 712 Result.end()); 713 } else { 714 TemplateDecl *TD 715 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 716 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 717 718 if (SS.isSet() && !SS.isInvalid()) 719 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 720 /*TemplateKeyword=*/false, 721 TD); 722 else 723 Template = TemplateName(TD); 724 } 725 726 if (IsFunctionTemplate) { 727 // Function templates always go through overload resolution, at which 728 // point we'll perform the various checks (e.g., accessibility) we need 729 // to based on which function we selected. 730 Result.suppressDiagnostics(); 731 732 return NameClassification::FunctionTemplate(Template); 733 } 734 735 return NameClassification::TypeTemplate(Template); 736 } 737 } 738 739 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 740 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 741 DiagnoseUseOfDecl(Type, NameLoc); 742 QualType T = Context.getTypeDeclType(Type); 743 return ParsedType::make(T); 744 } 745 746 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 747 if (!Class) { 748 // FIXME: It's unfortunate that we don't have a Type node for handling this. 749 if (ObjCCompatibleAliasDecl *Alias 750 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 751 Class = Alias->getClassInterface(); 752 } 753 754 if (Class) { 755 DiagnoseUseOfDecl(Class, NameLoc); 756 757 if (NextToken.is(tok::period)) { 758 // Interface. <something> is parsed as a property reference expression. 759 // Just return "unknown" as a fall-through for now. 760 Result.suppressDiagnostics(); 761 return NameClassification::Unknown(); 762 } 763 764 QualType T = Context.getObjCInterfaceType(Class); 765 return ParsedType::make(T); 766 } 767 768 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 769 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0); 770 771 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 772 return BuildDeclarationNameExpr(SS, Result, ADL); 773} 774 775// Determines the context to return to after temporarily entering a 776// context. This depends in an unnecessarily complicated way on the 777// exact ordering of callbacks from the parser. 778DeclContext *Sema::getContainingDC(DeclContext *DC) { 779 780 // Functions defined inline within classes aren't parsed until we've 781 // finished parsing the top-level class, so the top-level class is 782 // the context we'll need to return to. 783 if (isa<FunctionDecl>(DC)) { 784 DC = DC->getLexicalParent(); 785 786 // A function not defined within a class will always return to its 787 // lexical context. 788 if (!isa<CXXRecordDecl>(DC)) 789 return DC; 790 791 // A C++ inline method/friend is parsed *after* the topmost class 792 // it was declared in is fully parsed ("complete"); the topmost 793 // class is the context we need to return to. 794 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 795 DC = RD; 796 797 // Return the declaration context of the topmost class the inline method is 798 // declared in. 799 return DC; 800 } 801 802 return DC->getLexicalParent(); 803} 804 805void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 806 assert(getContainingDC(DC) == CurContext && 807 "The next DeclContext should be lexically contained in the current one."); 808 CurContext = DC; 809 S->setEntity(DC); 810} 811 812void Sema::PopDeclContext() { 813 assert(CurContext && "DeclContext imbalance!"); 814 815 CurContext = getContainingDC(CurContext); 816 assert(CurContext && "Popped translation unit!"); 817} 818 819/// EnterDeclaratorContext - Used when we must lookup names in the context 820/// of a declarator's nested name specifier. 821/// 822void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 823 // C++0x [basic.lookup.unqual]p13: 824 // A name used in the definition of a static data member of class 825 // X (after the qualified-id of the static member) is looked up as 826 // if the name was used in a member function of X. 827 // C++0x [basic.lookup.unqual]p14: 828 // If a variable member of a namespace is defined outside of the 829 // scope of its namespace then any name used in the definition of 830 // the variable member (after the declarator-id) is looked up as 831 // if the definition of the variable member occurred in its 832 // namespace. 833 // Both of these imply that we should push a scope whose context 834 // is the semantic context of the declaration. We can't use 835 // PushDeclContext here because that context is not necessarily 836 // lexically contained in the current context. Fortunately, 837 // the containing scope should have the appropriate information. 838 839 assert(!S->getEntity() && "scope already has entity"); 840 841#ifndef NDEBUG 842 Scope *Ancestor = S->getParent(); 843 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 844 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 845#endif 846 847 CurContext = DC; 848 S->setEntity(DC); 849} 850 851void Sema::ExitDeclaratorContext(Scope *S) { 852 assert(S->getEntity() == CurContext && "Context imbalance!"); 853 854 // Switch back to the lexical context. The safety of this is 855 // enforced by an assert in EnterDeclaratorContext. 856 Scope *Ancestor = S->getParent(); 857 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 858 CurContext = (DeclContext*) Ancestor->getEntity(); 859 860 // We don't need to do anything with the scope, which is going to 861 // disappear. 862} 863 864 865void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 866 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 867 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 868 // We assume that the caller has already called 869 // ActOnReenterTemplateScope 870 FD = TFD->getTemplatedDecl(); 871 } 872 if (!FD) 873 return; 874 875 PushDeclContext(S, FD); 876 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 877 ParmVarDecl *Param = FD->getParamDecl(P); 878 // If the parameter has an identifier, then add it to the scope 879 if (Param->getIdentifier()) { 880 S->AddDecl(Param); 881 IdResolver.AddDecl(Param); 882 } 883 } 884} 885 886 887/// \brief Determine whether we allow overloading of the function 888/// PrevDecl with another declaration. 889/// 890/// This routine determines whether overloading is possible, not 891/// whether some new function is actually an overload. It will return 892/// true in C++ (where we can always provide overloads) or, as an 893/// extension, in C when the previous function is already an 894/// overloaded function declaration or has the "overloadable" 895/// attribute. 896static bool AllowOverloadingOfFunction(LookupResult &Previous, 897 ASTContext &Context) { 898 if (Context.getLangOpts().CPlusPlus) 899 return true; 900 901 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 902 return true; 903 904 return (Previous.getResultKind() == LookupResult::Found 905 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 906} 907 908/// Add this decl to the scope shadowed decl chains. 909void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 910 // Move up the scope chain until we find the nearest enclosing 911 // non-transparent context. The declaration will be introduced into this 912 // scope. 913 while (S->getEntity() && 914 ((DeclContext *)S->getEntity())->isTransparentContext()) 915 S = S->getParent(); 916 917 // Add scoped declarations into their context, so that they can be 918 // found later. Declarations without a context won't be inserted 919 // into any context. 920 if (AddToContext) 921 CurContext->addDecl(D); 922 923 // Out-of-line definitions shouldn't be pushed into scope in C++. 924 // Out-of-line variable and function definitions shouldn't even in C. 925 if ((getLangOpts().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 926 D->isOutOfLine() && 927 !D->getDeclContext()->getRedeclContext()->Equals( 928 D->getLexicalDeclContext()->getRedeclContext())) 929 return; 930 931 // Template instantiations should also not be pushed into scope. 932 if (isa<FunctionDecl>(D) && 933 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 934 return; 935 936 // If this replaces anything in the current scope, 937 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 938 IEnd = IdResolver.end(); 939 for (; I != IEnd; ++I) { 940 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 941 S->RemoveDecl(*I); 942 IdResolver.RemoveDecl(*I); 943 944 // Should only need to replace one decl. 945 break; 946 } 947 } 948 949 S->AddDecl(D); 950 951 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 952 // Implicitly-generated labels may end up getting generated in an order that 953 // isn't strictly lexical, which breaks name lookup. Be careful to insert 954 // the label at the appropriate place in the identifier chain. 955 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 956 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 957 if (IDC == CurContext) { 958 if (!S->isDeclScope(*I)) 959 continue; 960 } else if (IDC->Encloses(CurContext)) 961 break; 962 } 963 964 IdResolver.InsertDeclAfter(I, D); 965 } else { 966 IdResolver.AddDecl(D); 967 } 968} 969 970void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 971 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 972 TUScope->AddDecl(D); 973} 974 975bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 976 bool ExplicitInstantiationOrSpecialization) { 977 return IdResolver.isDeclInScope(D, Ctx, Context, S, 978 ExplicitInstantiationOrSpecialization); 979} 980 981Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 982 DeclContext *TargetDC = DC->getPrimaryContext(); 983 do { 984 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 985 if (ScopeDC->getPrimaryContext() == TargetDC) 986 return S; 987 } while ((S = S->getParent())); 988 989 return 0; 990} 991 992static bool isOutOfScopePreviousDeclaration(NamedDecl *, 993 DeclContext*, 994 ASTContext&); 995 996/// Filters out lookup results that don't fall within the given scope 997/// as determined by isDeclInScope. 998void Sema::FilterLookupForScope(LookupResult &R, 999 DeclContext *Ctx, Scope *S, 1000 bool ConsiderLinkage, 1001 bool ExplicitInstantiationOrSpecialization) { 1002 LookupResult::Filter F = R.makeFilter(); 1003 while (F.hasNext()) { 1004 NamedDecl *D = F.next(); 1005 1006 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 1007 continue; 1008 1009 if (ConsiderLinkage && 1010 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 1011 continue; 1012 1013 F.erase(); 1014 } 1015 1016 F.done(); 1017} 1018 1019static bool isUsingDecl(NamedDecl *D) { 1020 return isa<UsingShadowDecl>(D) || 1021 isa<UnresolvedUsingTypenameDecl>(D) || 1022 isa<UnresolvedUsingValueDecl>(D); 1023} 1024 1025/// Removes using shadow declarations from the lookup results. 1026static void RemoveUsingDecls(LookupResult &R) { 1027 LookupResult::Filter F = R.makeFilter(); 1028 while (F.hasNext()) 1029 if (isUsingDecl(F.next())) 1030 F.erase(); 1031 1032 F.done(); 1033} 1034 1035/// \brief Check for this common pattern: 1036/// @code 1037/// class S { 1038/// S(const S&); // DO NOT IMPLEMENT 1039/// void operator=(const S&); // DO NOT IMPLEMENT 1040/// }; 1041/// @endcode 1042static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1043 // FIXME: Should check for private access too but access is set after we get 1044 // the decl here. 1045 if (D->doesThisDeclarationHaveABody()) 1046 return false; 1047 1048 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1049 return CD->isCopyConstructor(); 1050 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1051 return Method->isCopyAssignmentOperator(); 1052 return false; 1053} 1054 1055bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1056 assert(D); 1057 1058 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1059 return false; 1060 1061 // Ignore class templates. 1062 if (D->getDeclContext()->isDependentContext() || 1063 D->getLexicalDeclContext()->isDependentContext()) 1064 return false; 1065 1066 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1067 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1068 return false; 1069 1070 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1071 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1072 return false; 1073 } else { 1074 // 'static inline' functions are used in headers; don't warn. 1075 if (FD->getStorageClass() == SC_Static && 1076 FD->isInlineSpecified()) 1077 return false; 1078 } 1079 1080 if (FD->doesThisDeclarationHaveABody() && 1081 Context.DeclMustBeEmitted(FD)) 1082 return false; 1083 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1084 if (!VD->isFileVarDecl() || 1085 VD->getType().isConstant(Context) || 1086 Context.DeclMustBeEmitted(VD)) 1087 return false; 1088 1089 if (VD->isStaticDataMember() && 1090 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1091 return false; 1092 1093 } else { 1094 return false; 1095 } 1096 1097 // Only warn for unused decls internal to the translation unit. 1098 if (D->getLinkage() == ExternalLinkage) 1099 return false; 1100 1101 return true; 1102} 1103 1104void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1105 if (!D) 1106 return; 1107 1108 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1109 const FunctionDecl *First = FD->getFirstDeclaration(); 1110 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1111 return; // First should already be in the vector. 1112 } 1113 1114 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1115 const VarDecl *First = VD->getFirstDeclaration(); 1116 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1117 return; // First should already be in the vector. 1118 } 1119 1120 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1121 UnusedFileScopedDecls.push_back(D); 1122 } 1123 1124static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1125 if (D->isInvalidDecl()) 1126 return false; 1127 1128 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1129 return false; 1130 1131 if (isa<LabelDecl>(D)) 1132 return true; 1133 1134 // White-list anything that isn't a local variable. 1135 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1136 !D->getDeclContext()->isFunctionOrMethod()) 1137 return false; 1138 1139 // Types of valid local variables should be complete, so this should succeed. 1140 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1141 1142 // White-list anything with an __attribute__((unused)) type. 1143 QualType Ty = VD->getType(); 1144 1145 // Only look at the outermost level of typedef. 1146 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1147 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1148 return false; 1149 } 1150 1151 // If we failed to complete the type for some reason, or if the type is 1152 // dependent, don't diagnose the variable. 1153 if (Ty->isIncompleteType() || Ty->isDependentType()) 1154 return false; 1155 1156 if (const TagType *TT = Ty->getAs<TagType>()) { 1157 const TagDecl *Tag = TT->getDecl(); 1158 if (Tag->hasAttr<UnusedAttr>()) 1159 return false; 1160 1161 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1162 if (!RD->hasTrivialDestructor()) 1163 return false; 1164 1165 if (const Expr *Init = VD->getInit()) { 1166 const CXXConstructExpr *Construct = 1167 dyn_cast<CXXConstructExpr>(Init); 1168 if (Construct && !Construct->isElidable()) { 1169 CXXConstructorDecl *CD = Construct->getConstructor(); 1170 if (!CD->isTrivial()) 1171 return false; 1172 } 1173 } 1174 } 1175 } 1176 1177 // TODO: __attribute__((unused)) templates? 1178 } 1179 1180 return true; 1181} 1182 1183static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1184 FixItHint &Hint) { 1185 if (isa<LabelDecl>(D)) { 1186 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1187 tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), true); 1188 if (AfterColon.isInvalid()) 1189 return; 1190 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1191 getCharRange(D->getLocStart(), AfterColon)); 1192 } 1193 return; 1194} 1195 1196/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1197/// unless they are marked attr(unused). 1198void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1199 FixItHint Hint; 1200 if (!ShouldDiagnoseUnusedDecl(D)) 1201 return; 1202 1203 GenerateFixForUnusedDecl(D, Context, Hint); 1204 1205 unsigned DiagID; 1206 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1207 DiagID = diag::warn_unused_exception_param; 1208 else if (isa<LabelDecl>(D)) 1209 DiagID = diag::warn_unused_label; 1210 else 1211 DiagID = diag::warn_unused_variable; 1212 1213 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1214} 1215 1216static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1217 // Verify that we have no forward references left. If so, there was a goto 1218 // or address of a label taken, but no definition of it. Label fwd 1219 // definitions are indicated with a null substmt. 1220 if (L->getStmt() == 0) 1221 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1222} 1223 1224void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1225 if (S->decl_empty()) return; 1226 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1227 "Scope shouldn't contain decls!"); 1228 1229 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1230 I != E; ++I) { 1231 Decl *TmpD = (*I); 1232 assert(TmpD && "This decl didn't get pushed??"); 1233 1234 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1235 NamedDecl *D = cast<NamedDecl>(TmpD); 1236 1237 if (!D->getDeclName()) continue; 1238 1239 // Diagnose unused variables in this scope. 1240 if (!S->hasErrorOccurred()) 1241 DiagnoseUnusedDecl(D); 1242 1243 // If this was a forward reference to a label, verify it was defined. 1244 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1245 CheckPoppedLabel(LD, *this); 1246 1247 // Remove this name from our lexical scope. 1248 IdResolver.RemoveDecl(D); 1249 } 1250} 1251 1252void Sema::ActOnStartFunctionDeclarator() { 1253 ++InFunctionDeclarator; 1254} 1255 1256void Sema::ActOnEndFunctionDeclarator() { 1257 assert(InFunctionDeclarator); 1258 --InFunctionDeclarator; 1259} 1260 1261/// \brief Look for an Objective-C class in the translation unit. 1262/// 1263/// \param Id The name of the Objective-C class we're looking for. If 1264/// typo-correction fixes this name, the Id will be updated 1265/// to the fixed name. 1266/// 1267/// \param IdLoc The location of the name in the translation unit. 1268/// 1269/// \param TypoCorrection If true, this routine will attempt typo correction 1270/// if there is no class with the given name. 1271/// 1272/// \returns The declaration of the named Objective-C class, or NULL if the 1273/// class could not be found. 1274ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1275 SourceLocation IdLoc, 1276 bool DoTypoCorrection) { 1277 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1278 // creation from this context. 1279 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1280 1281 if (!IDecl && DoTypoCorrection) { 1282 // Perform typo correction at the given location, but only if we 1283 // find an Objective-C class name. 1284 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1285 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1286 LookupOrdinaryName, TUScope, NULL, 1287 Validator)) { 1288 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1289 Diag(IdLoc, diag::err_undef_interface_suggest) 1290 << Id << IDecl->getDeclName() 1291 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1292 Diag(IDecl->getLocation(), diag::note_previous_decl) 1293 << IDecl->getDeclName(); 1294 1295 Id = IDecl->getIdentifier(); 1296 } 1297 } 1298 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1299 // This routine must always return a class definition, if any. 1300 if (Def && Def->getDefinition()) 1301 Def = Def->getDefinition(); 1302 return Def; 1303} 1304 1305/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1306/// from S, where a non-field would be declared. This routine copes 1307/// with the difference between C and C++ scoping rules in structs and 1308/// unions. For example, the following code is well-formed in C but 1309/// ill-formed in C++: 1310/// @code 1311/// struct S6 { 1312/// enum { BAR } e; 1313/// }; 1314/// 1315/// void test_S6() { 1316/// struct S6 a; 1317/// a.e = BAR; 1318/// } 1319/// @endcode 1320/// For the declaration of BAR, this routine will return a different 1321/// scope. The scope S will be the scope of the unnamed enumeration 1322/// within S6. In C++, this routine will return the scope associated 1323/// with S6, because the enumeration's scope is a transparent 1324/// context but structures can contain non-field names. In C, this 1325/// routine will return the translation unit scope, since the 1326/// enumeration's scope is a transparent context and structures cannot 1327/// contain non-field names. 1328Scope *Sema::getNonFieldDeclScope(Scope *S) { 1329 while (((S->getFlags() & Scope::DeclScope) == 0) || 1330 (S->getEntity() && 1331 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1332 (S->isClassScope() && !getLangOpts().CPlusPlus)) 1333 S = S->getParent(); 1334 return S; 1335} 1336 1337/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1338/// file scope. lazily create a decl for it. ForRedeclaration is true 1339/// if we're creating this built-in in anticipation of redeclaring the 1340/// built-in. 1341NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1342 Scope *S, bool ForRedeclaration, 1343 SourceLocation Loc) { 1344 Builtin::ID BID = (Builtin::ID)bid; 1345 1346 ASTContext::GetBuiltinTypeError Error; 1347 QualType R = Context.GetBuiltinType(BID, Error); 1348 switch (Error) { 1349 case ASTContext::GE_None: 1350 // Okay 1351 break; 1352 1353 case ASTContext::GE_Missing_stdio: 1354 if (ForRedeclaration) 1355 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1356 << Context.BuiltinInfo.GetName(BID); 1357 return 0; 1358 1359 case ASTContext::GE_Missing_setjmp: 1360 if (ForRedeclaration) 1361 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1362 << Context.BuiltinInfo.GetName(BID); 1363 return 0; 1364 1365 case ASTContext::GE_Missing_ucontext: 1366 if (ForRedeclaration) 1367 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1368 << Context.BuiltinInfo.GetName(BID); 1369 return 0; 1370 } 1371 1372 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1373 Diag(Loc, diag::ext_implicit_lib_function_decl) 1374 << Context.BuiltinInfo.GetName(BID) 1375 << R; 1376 if (Context.BuiltinInfo.getHeaderName(BID) && 1377 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1378 != DiagnosticsEngine::Ignored) 1379 Diag(Loc, diag::note_please_include_header) 1380 << Context.BuiltinInfo.getHeaderName(BID) 1381 << Context.BuiltinInfo.GetName(BID); 1382 } 1383 1384 FunctionDecl *New = FunctionDecl::Create(Context, 1385 Context.getTranslationUnitDecl(), 1386 Loc, Loc, II, R, /*TInfo=*/0, 1387 SC_Extern, 1388 SC_None, false, 1389 /*hasPrototype=*/true); 1390 New->setImplicit(); 1391 1392 // Create Decl objects for each parameter, adding them to the 1393 // FunctionDecl. 1394 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1395 SmallVector<ParmVarDecl*, 16> Params; 1396 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1397 ParmVarDecl *parm = 1398 ParmVarDecl::Create(Context, New, SourceLocation(), 1399 SourceLocation(), 0, 1400 FT->getArgType(i), /*TInfo=*/0, 1401 SC_None, SC_None, 0); 1402 parm->setScopeInfo(0, i); 1403 Params.push_back(parm); 1404 } 1405 New->setParams(Params); 1406 } 1407 1408 AddKnownFunctionAttributes(New); 1409 1410 // TUScope is the translation-unit scope to insert this function into. 1411 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1412 // relate Scopes to DeclContexts, and probably eliminate CurContext 1413 // entirely, but we're not there yet. 1414 DeclContext *SavedContext = CurContext; 1415 CurContext = Context.getTranslationUnitDecl(); 1416 PushOnScopeChains(New, TUScope); 1417 CurContext = SavedContext; 1418 return New; 1419} 1420 1421bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1422 QualType OldType; 1423 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1424 OldType = OldTypedef->getUnderlyingType(); 1425 else 1426 OldType = Context.getTypeDeclType(Old); 1427 QualType NewType = New->getUnderlyingType(); 1428 1429 if (NewType->isVariablyModifiedType()) { 1430 // Must not redefine a typedef with a variably-modified type. 1431 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1432 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1433 << Kind << NewType; 1434 if (Old->getLocation().isValid()) 1435 Diag(Old->getLocation(), diag::note_previous_definition); 1436 New->setInvalidDecl(); 1437 return true; 1438 } 1439 1440 if (OldType != NewType && 1441 !OldType->isDependentType() && 1442 !NewType->isDependentType() && 1443 !Context.hasSameType(OldType, NewType)) { 1444 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1445 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1446 << Kind << NewType << OldType; 1447 if (Old->getLocation().isValid()) 1448 Diag(Old->getLocation(), diag::note_previous_definition); 1449 New->setInvalidDecl(); 1450 return true; 1451 } 1452 return false; 1453} 1454 1455/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1456/// same name and scope as a previous declaration 'Old'. Figure out 1457/// how to resolve this situation, merging decls or emitting 1458/// diagnostics as appropriate. If there was an error, set New to be invalid. 1459/// 1460void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1461 // If the new decl is known invalid already, don't bother doing any 1462 // merging checks. 1463 if (New->isInvalidDecl()) return; 1464 1465 // Allow multiple definitions for ObjC built-in typedefs. 1466 // FIXME: Verify the underlying types are equivalent! 1467 if (getLangOpts().ObjC1) { 1468 const IdentifierInfo *TypeID = New->getIdentifier(); 1469 switch (TypeID->getLength()) { 1470 default: break; 1471 case 2: 1472 if (!TypeID->isStr("id")) 1473 break; 1474 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1475 // Install the built-in type for 'id', ignoring the current definition. 1476 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1477 return; 1478 case 5: 1479 if (!TypeID->isStr("Class")) 1480 break; 1481 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1482 // Install the built-in type for 'Class', ignoring the current definition. 1483 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1484 return; 1485 case 3: 1486 if (!TypeID->isStr("SEL")) 1487 break; 1488 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1489 // Install the built-in type for 'SEL', ignoring the current definition. 1490 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1491 return; 1492 } 1493 // Fall through - the typedef name was not a builtin type. 1494 } 1495 1496 // Verify the old decl was also a type. 1497 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1498 if (!Old) { 1499 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1500 << New->getDeclName(); 1501 1502 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1503 if (OldD->getLocation().isValid()) 1504 Diag(OldD->getLocation(), diag::note_previous_definition); 1505 1506 return New->setInvalidDecl(); 1507 } 1508 1509 // If the old declaration is invalid, just give up here. 1510 if (Old->isInvalidDecl()) 1511 return New->setInvalidDecl(); 1512 1513 // If the typedef types are not identical, reject them in all languages and 1514 // with any extensions enabled. 1515 if (isIncompatibleTypedef(Old, New)) 1516 return; 1517 1518 // The types match. Link up the redeclaration chain if the old 1519 // declaration was a typedef. 1520 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1521 New->setPreviousDeclaration(Typedef); 1522 1523 if (getLangOpts().MicrosoftExt) 1524 return; 1525 1526 if (getLangOpts().CPlusPlus) { 1527 // C++ [dcl.typedef]p2: 1528 // In a given non-class scope, a typedef specifier can be used to 1529 // redefine the name of any type declared in that scope to refer 1530 // to the type to which it already refers. 1531 if (!isa<CXXRecordDecl>(CurContext)) 1532 return; 1533 1534 // C++0x [dcl.typedef]p4: 1535 // In a given class scope, a typedef specifier can be used to redefine 1536 // any class-name declared in that scope that is not also a typedef-name 1537 // to refer to the type to which it already refers. 1538 // 1539 // This wording came in via DR424, which was a correction to the 1540 // wording in DR56, which accidentally banned code like: 1541 // 1542 // struct S { 1543 // typedef struct A { } A; 1544 // }; 1545 // 1546 // in the C++03 standard. We implement the C++0x semantics, which 1547 // allow the above but disallow 1548 // 1549 // struct S { 1550 // typedef int I; 1551 // typedef int I; 1552 // }; 1553 // 1554 // since that was the intent of DR56. 1555 if (!isa<TypedefNameDecl>(Old)) 1556 return; 1557 1558 Diag(New->getLocation(), diag::err_redefinition) 1559 << New->getDeclName(); 1560 Diag(Old->getLocation(), diag::note_previous_definition); 1561 return New->setInvalidDecl(); 1562 } 1563 1564 // Modules always permit redefinition of typedefs, as does C11. 1565 if (getLangOpts().Modules || getLangOpts().C11) 1566 return; 1567 1568 // If we have a redefinition of a typedef in C, emit a warning. This warning 1569 // is normally mapped to an error, but can be controlled with 1570 // -Wtypedef-redefinition. If either the original or the redefinition is 1571 // in a system header, don't emit this for compatibility with GCC. 1572 if (getDiagnostics().getSuppressSystemWarnings() && 1573 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1574 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1575 return; 1576 1577 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1578 << New->getDeclName(); 1579 Diag(Old->getLocation(), diag::note_previous_definition); 1580 return; 1581} 1582 1583/// DeclhasAttr - returns true if decl Declaration already has the target 1584/// attribute. 1585static bool 1586DeclHasAttr(const Decl *D, const Attr *A) { 1587 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1588 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1589 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1590 if ((*i)->getKind() == A->getKind()) { 1591 if (Ann) { 1592 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1593 return true; 1594 continue; 1595 } 1596 // FIXME: Don't hardcode this check 1597 if (OA && isa<OwnershipAttr>(*i)) 1598 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1599 return true; 1600 } 1601 1602 return false; 1603} 1604 1605/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1606void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1607 bool MergeDeprecation) { 1608 if (!Old->hasAttrs()) 1609 return; 1610 1611 bool foundAny = New->hasAttrs(); 1612 1613 // Ensure that any moving of objects within the allocated map is done before 1614 // we process them. 1615 if (!foundAny) New->setAttrs(AttrVec()); 1616 1617 for (specific_attr_iterator<InheritableAttr> 1618 i = Old->specific_attr_begin<InheritableAttr>(), 1619 e = Old->specific_attr_end<InheritableAttr>(); 1620 i != e; ++i) { 1621 // Ignore deprecated/unavailable/availability attributes if requested. 1622 if (!MergeDeprecation && 1623 (isa<DeprecatedAttr>(*i) || 1624 isa<UnavailableAttr>(*i) || 1625 isa<AvailabilityAttr>(*i))) 1626 continue; 1627 1628 if (!DeclHasAttr(New, *i)) { 1629 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(Context)); 1630 newAttr->setInherited(true); 1631 New->addAttr(newAttr); 1632 foundAny = true; 1633 } 1634 } 1635 1636 if (!foundAny) New->dropAttrs(); 1637} 1638 1639/// mergeParamDeclAttributes - Copy attributes from the old parameter 1640/// to the new one. 1641static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1642 const ParmVarDecl *oldDecl, 1643 ASTContext &C) { 1644 if (!oldDecl->hasAttrs()) 1645 return; 1646 1647 bool foundAny = newDecl->hasAttrs(); 1648 1649 // Ensure that any moving of objects within the allocated map is 1650 // done before we process them. 1651 if (!foundAny) newDecl->setAttrs(AttrVec()); 1652 1653 for (specific_attr_iterator<InheritableParamAttr> 1654 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1655 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1656 if (!DeclHasAttr(newDecl, *i)) { 1657 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1658 newAttr->setInherited(true); 1659 newDecl->addAttr(newAttr); 1660 foundAny = true; 1661 } 1662 } 1663 1664 if (!foundAny) newDecl->dropAttrs(); 1665} 1666 1667namespace { 1668 1669/// Used in MergeFunctionDecl to keep track of function parameters in 1670/// C. 1671struct GNUCompatibleParamWarning { 1672 ParmVarDecl *OldParm; 1673 ParmVarDecl *NewParm; 1674 QualType PromotedType; 1675}; 1676 1677} 1678 1679/// getSpecialMember - get the special member enum for a method. 1680Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1681 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1682 if (Ctor->isDefaultConstructor()) 1683 return Sema::CXXDefaultConstructor; 1684 1685 if (Ctor->isCopyConstructor()) 1686 return Sema::CXXCopyConstructor; 1687 1688 if (Ctor->isMoveConstructor()) 1689 return Sema::CXXMoveConstructor; 1690 } else if (isa<CXXDestructorDecl>(MD)) { 1691 return Sema::CXXDestructor; 1692 } else if (MD->isCopyAssignmentOperator()) { 1693 return Sema::CXXCopyAssignment; 1694 } else if (MD->isMoveAssignmentOperator()) { 1695 return Sema::CXXMoveAssignment; 1696 } 1697 1698 return Sema::CXXInvalid; 1699} 1700 1701/// canRedefineFunction - checks if a function can be redefined. Currently, 1702/// only extern inline functions can be redefined, and even then only in 1703/// GNU89 mode. 1704static bool canRedefineFunction(const FunctionDecl *FD, 1705 const LangOptions& LangOpts) { 1706 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1707 !LangOpts.CPlusPlus && 1708 FD->isInlineSpecified() && 1709 FD->getStorageClass() == SC_Extern); 1710} 1711 1712/// MergeFunctionDecl - We just parsed a function 'New' from 1713/// declarator D which has the same name and scope as a previous 1714/// declaration 'Old'. Figure out how to resolve this situation, 1715/// merging decls or emitting diagnostics as appropriate. 1716/// 1717/// In C++, New and Old must be declarations that are not 1718/// overloaded. Use IsOverload to determine whether New and Old are 1719/// overloaded, and to select the Old declaration that New should be 1720/// merged with. 1721/// 1722/// Returns true if there was an error, false otherwise. 1723bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) { 1724 // Verify the old decl was also a function. 1725 FunctionDecl *Old = 0; 1726 if (FunctionTemplateDecl *OldFunctionTemplate 1727 = dyn_cast<FunctionTemplateDecl>(OldD)) 1728 Old = OldFunctionTemplate->getTemplatedDecl(); 1729 else 1730 Old = dyn_cast<FunctionDecl>(OldD); 1731 if (!Old) { 1732 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1733 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1734 Diag(Shadow->getTargetDecl()->getLocation(), 1735 diag::note_using_decl_target); 1736 Diag(Shadow->getUsingDecl()->getLocation(), 1737 diag::note_using_decl) << 0; 1738 return true; 1739 } 1740 1741 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1742 << New->getDeclName(); 1743 Diag(OldD->getLocation(), diag::note_previous_definition); 1744 return true; 1745 } 1746 1747 // Determine whether the previous declaration was a definition, 1748 // implicit declaration, or a declaration. 1749 diag::kind PrevDiag; 1750 if (Old->isThisDeclarationADefinition()) 1751 PrevDiag = diag::note_previous_definition; 1752 else if (Old->isImplicit()) 1753 PrevDiag = diag::note_previous_implicit_declaration; 1754 else 1755 PrevDiag = diag::note_previous_declaration; 1756 1757 QualType OldQType = Context.getCanonicalType(Old->getType()); 1758 QualType NewQType = Context.getCanonicalType(New->getType()); 1759 1760 // Don't complain about this if we're in GNU89 mode and the old function 1761 // is an extern inline function. 1762 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1763 New->getStorageClass() == SC_Static && 1764 Old->getStorageClass() != SC_Static && 1765 !canRedefineFunction(Old, getLangOpts())) { 1766 if (getLangOpts().MicrosoftExt) { 1767 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1768 Diag(Old->getLocation(), PrevDiag); 1769 } else { 1770 Diag(New->getLocation(), diag::err_static_non_static) << New; 1771 Diag(Old->getLocation(), PrevDiag); 1772 return true; 1773 } 1774 } 1775 1776 // If a function is first declared with a calling convention, but is 1777 // later declared or defined without one, the second decl assumes the 1778 // calling convention of the first. 1779 // 1780 // For the new decl, we have to look at the NON-canonical type to tell the 1781 // difference between a function that really doesn't have a calling 1782 // convention and one that is declared cdecl. That's because in 1783 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1784 // because it is the default calling convention. 1785 // 1786 // Note also that we DO NOT return at this point, because we still have 1787 // other tests to run. 1788 const FunctionType *OldType = cast<FunctionType>(OldQType); 1789 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1790 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1791 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1792 bool RequiresAdjustment = false; 1793 if (OldTypeInfo.getCC() != CC_Default && 1794 NewTypeInfo.getCC() == CC_Default) { 1795 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1796 RequiresAdjustment = true; 1797 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1798 NewTypeInfo.getCC())) { 1799 // Calling conventions really aren't compatible, so complain. 1800 Diag(New->getLocation(), diag::err_cconv_change) 1801 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1802 << (OldTypeInfo.getCC() == CC_Default) 1803 << (OldTypeInfo.getCC() == CC_Default ? "" : 1804 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1805 Diag(Old->getLocation(), diag::note_previous_declaration); 1806 return true; 1807 } 1808 1809 // FIXME: diagnose the other way around? 1810 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1811 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1812 RequiresAdjustment = true; 1813 } 1814 1815 // Merge regparm attribute. 1816 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1817 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1818 if (NewTypeInfo.getHasRegParm()) { 1819 Diag(New->getLocation(), diag::err_regparm_mismatch) 1820 << NewType->getRegParmType() 1821 << OldType->getRegParmType(); 1822 Diag(Old->getLocation(), diag::note_previous_declaration); 1823 return true; 1824 } 1825 1826 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1827 RequiresAdjustment = true; 1828 } 1829 1830 // Merge ns_returns_retained attribute. 1831 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1832 if (NewTypeInfo.getProducesResult()) { 1833 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1834 Diag(Old->getLocation(), diag::note_previous_declaration); 1835 return true; 1836 } 1837 1838 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1839 RequiresAdjustment = true; 1840 } 1841 1842 if (RequiresAdjustment) { 1843 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1844 New->setType(QualType(NewType, 0)); 1845 NewQType = Context.getCanonicalType(New->getType()); 1846 } 1847 1848 if (getLangOpts().CPlusPlus) { 1849 // (C++98 13.1p2): 1850 // Certain function declarations cannot be overloaded: 1851 // -- Function declarations that differ only in the return type 1852 // cannot be overloaded. 1853 QualType OldReturnType = OldType->getResultType(); 1854 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1855 QualType ResQT; 1856 if (OldReturnType != NewReturnType) { 1857 if (NewReturnType->isObjCObjectPointerType() 1858 && OldReturnType->isObjCObjectPointerType()) 1859 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1860 if (ResQT.isNull()) { 1861 if (New->isCXXClassMember() && New->isOutOfLine()) 1862 Diag(New->getLocation(), 1863 diag::err_member_def_does_not_match_ret_type) << New; 1864 else 1865 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1866 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1867 return true; 1868 } 1869 else 1870 NewQType = ResQT; 1871 } 1872 1873 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1874 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1875 if (OldMethod && NewMethod) { 1876 // Preserve triviality. 1877 NewMethod->setTrivial(OldMethod->isTrivial()); 1878 1879 // MSVC allows explicit template specialization at class scope: 1880 // 2 CXMethodDecls referring to the same function will be injected. 1881 // We don't want a redeclartion error. 1882 bool IsClassScopeExplicitSpecialization = 1883 OldMethod->isFunctionTemplateSpecialization() && 1884 NewMethod->isFunctionTemplateSpecialization(); 1885 bool isFriend = NewMethod->getFriendObjectKind(); 1886 1887 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1888 !IsClassScopeExplicitSpecialization) { 1889 // -- Member function declarations with the same name and the 1890 // same parameter types cannot be overloaded if any of them 1891 // is a static member function declaration. 1892 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1893 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1894 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1895 return true; 1896 } 1897 1898 // C++ [class.mem]p1: 1899 // [...] A member shall not be declared twice in the 1900 // member-specification, except that a nested class or member 1901 // class template can be declared and then later defined. 1902 unsigned NewDiag; 1903 if (isa<CXXConstructorDecl>(OldMethod)) 1904 NewDiag = diag::err_constructor_redeclared; 1905 else if (isa<CXXDestructorDecl>(NewMethod)) 1906 NewDiag = diag::err_destructor_redeclared; 1907 else if (isa<CXXConversionDecl>(NewMethod)) 1908 NewDiag = diag::err_conv_function_redeclared; 1909 else 1910 NewDiag = diag::err_member_redeclared; 1911 1912 Diag(New->getLocation(), NewDiag); 1913 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1914 1915 // Complain if this is an explicit declaration of a special 1916 // member that was initially declared implicitly. 1917 // 1918 // As an exception, it's okay to befriend such methods in order 1919 // to permit the implicit constructor/destructor/operator calls. 1920 } else if (OldMethod->isImplicit()) { 1921 if (isFriend) { 1922 NewMethod->setImplicit(); 1923 } else { 1924 Diag(NewMethod->getLocation(), 1925 diag::err_definition_of_implicitly_declared_member) 1926 << New << getSpecialMember(OldMethod); 1927 return true; 1928 } 1929 } else if (OldMethod->isExplicitlyDefaulted()) { 1930 Diag(NewMethod->getLocation(), 1931 diag::err_definition_of_explicitly_defaulted_member) 1932 << getSpecialMember(OldMethod); 1933 return true; 1934 } 1935 } 1936 1937 // (C++98 8.3.5p3): 1938 // All declarations for a function shall agree exactly in both the 1939 // return type and the parameter-type-list. 1940 // We also want to respect all the extended bits except noreturn. 1941 1942 // noreturn should now match unless the old type info didn't have it. 1943 QualType OldQTypeForComparison = OldQType; 1944 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1945 assert(OldQType == QualType(OldType, 0)); 1946 const FunctionType *OldTypeForComparison 1947 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1948 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1949 assert(OldQTypeForComparison.isCanonical()); 1950 } 1951 1952 if (OldQTypeForComparison == NewQType) 1953 return MergeCompatibleFunctionDecls(New, Old, S); 1954 1955 // Fall through for conflicting redeclarations and redefinitions. 1956 } 1957 1958 // C: Function types need to be compatible, not identical. This handles 1959 // duplicate function decls like "void f(int); void f(enum X);" properly. 1960 if (!getLangOpts().CPlusPlus && 1961 Context.typesAreCompatible(OldQType, NewQType)) { 1962 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1963 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1964 const FunctionProtoType *OldProto = 0; 1965 if (isa<FunctionNoProtoType>(NewFuncType) && 1966 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1967 // The old declaration provided a function prototype, but the 1968 // new declaration does not. Merge in the prototype. 1969 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1970 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1971 OldProto->arg_type_end()); 1972 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1973 ParamTypes.data(), ParamTypes.size(), 1974 OldProto->getExtProtoInfo()); 1975 New->setType(NewQType); 1976 New->setHasInheritedPrototype(); 1977 1978 // Synthesize a parameter for each argument type. 1979 SmallVector<ParmVarDecl*, 16> Params; 1980 for (FunctionProtoType::arg_type_iterator 1981 ParamType = OldProto->arg_type_begin(), 1982 ParamEnd = OldProto->arg_type_end(); 1983 ParamType != ParamEnd; ++ParamType) { 1984 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1985 SourceLocation(), 1986 SourceLocation(), 0, 1987 *ParamType, /*TInfo=*/0, 1988 SC_None, SC_None, 1989 0); 1990 Param->setScopeInfo(0, Params.size()); 1991 Param->setImplicit(); 1992 Params.push_back(Param); 1993 } 1994 1995 New->setParams(Params); 1996 } 1997 1998 return MergeCompatibleFunctionDecls(New, Old, S); 1999 } 2000 2001 // GNU C permits a K&R definition to follow a prototype declaration 2002 // if the declared types of the parameters in the K&R definition 2003 // match the types in the prototype declaration, even when the 2004 // promoted types of the parameters from the K&R definition differ 2005 // from the types in the prototype. GCC then keeps the types from 2006 // the prototype. 2007 // 2008 // If a variadic prototype is followed by a non-variadic K&R definition, 2009 // the K&R definition becomes variadic. This is sort of an edge case, but 2010 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2011 // C99 6.9.1p8. 2012 if (!getLangOpts().CPlusPlus && 2013 Old->hasPrototype() && !New->hasPrototype() && 2014 New->getType()->getAs<FunctionProtoType>() && 2015 Old->getNumParams() == New->getNumParams()) { 2016 SmallVector<QualType, 16> ArgTypes; 2017 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2018 const FunctionProtoType *OldProto 2019 = Old->getType()->getAs<FunctionProtoType>(); 2020 const FunctionProtoType *NewProto 2021 = New->getType()->getAs<FunctionProtoType>(); 2022 2023 // Determine whether this is the GNU C extension. 2024 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2025 NewProto->getResultType()); 2026 bool LooseCompatible = !MergedReturn.isNull(); 2027 for (unsigned Idx = 0, End = Old->getNumParams(); 2028 LooseCompatible && Idx != End; ++Idx) { 2029 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2030 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2031 if (Context.typesAreCompatible(OldParm->getType(), 2032 NewProto->getArgType(Idx))) { 2033 ArgTypes.push_back(NewParm->getType()); 2034 } else if (Context.typesAreCompatible(OldParm->getType(), 2035 NewParm->getType(), 2036 /*CompareUnqualified=*/true)) { 2037 GNUCompatibleParamWarning Warn 2038 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2039 Warnings.push_back(Warn); 2040 ArgTypes.push_back(NewParm->getType()); 2041 } else 2042 LooseCompatible = false; 2043 } 2044 2045 if (LooseCompatible) { 2046 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2047 Diag(Warnings[Warn].NewParm->getLocation(), 2048 diag::ext_param_promoted_not_compatible_with_prototype) 2049 << Warnings[Warn].PromotedType 2050 << Warnings[Warn].OldParm->getType(); 2051 if (Warnings[Warn].OldParm->getLocation().isValid()) 2052 Diag(Warnings[Warn].OldParm->getLocation(), 2053 diag::note_previous_declaration); 2054 } 2055 2056 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2057 ArgTypes.size(), 2058 OldProto->getExtProtoInfo())); 2059 return MergeCompatibleFunctionDecls(New, Old, S); 2060 } 2061 2062 // Fall through to diagnose conflicting types. 2063 } 2064 2065 // A function that has already been declared has been redeclared or defined 2066 // with a different type- show appropriate diagnostic 2067 if (unsigned BuiltinID = Old->getBuiltinID()) { 2068 // The user has declared a builtin function with an incompatible 2069 // signature. 2070 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2071 // The function the user is redeclaring is a library-defined 2072 // function like 'malloc' or 'printf'. Warn about the 2073 // redeclaration, then pretend that we don't know about this 2074 // library built-in. 2075 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2076 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2077 << Old << Old->getType(); 2078 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2079 Old->setInvalidDecl(); 2080 return false; 2081 } 2082 2083 PrevDiag = diag::note_previous_builtin_declaration; 2084 } 2085 2086 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2087 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2088 return true; 2089} 2090 2091/// \brief Completes the merge of two function declarations that are 2092/// known to be compatible. 2093/// 2094/// This routine handles the merging of attributes and other 2095/// properties of function declarations form the old declaration to 2096/// the new declaration, once we know that New is in fact a 2097/// redeclaration of Old. 2098/// 2099/// \returns false 2100bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old, 2101 Scope *S) { 2102 // Merge the attributes 2103 mergeDeclAttributes(New, Old); 2104 2105 // Merge the storage class. 2106 if (Old->getStorageClass() != SC_Extern && 2107 Old->getStorageClass() != SC_None) 2108 New->setStorageClass(Old->getStorageClass()); 2109 2110 // Merge "pure" flag. 2111 if (Old->isPure()) 2112 New->setPure(); 2113 2114 // Merge attributes from the parameters. These can mismatch with K&R 2115 // declarations. 2116 if (New->getNumParams() == Old->getNumParams()) 2117 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2118 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2119 Context); 2120 2121 if (getLangOpts().CPlusPlus) 2122 return MergeCXXFunctionDecl(New, Old, S); 2123 2124 return false; 2125} 2126 2127 2128void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2129 ObjCMethodDecl *oldMethod) { 2130 // We don't want to merge unavailable and deprecated attributes 2131 // except from interface to implementation. 2132 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2133 2134 // Merge the attributes. 2135 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2136 2137 // Merge attributes from the parameters. 2138 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2139 for (ObjCMethodDecl::param_iterator 2140 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2141 ni != ne; ++ni, ++oi) 2142 mergeParamDeclAttributes(*ni, *oi, Context); 2143 2144 CheckObjCMethodOverride(newMethod, oldMethod, true); 2145} 2146 2147/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2148/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2149/// emitting diagnostics as appropriate. 2150/// 2151/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2152/// to here in AddInitializerToDecl. We can't check them before the initializer 2153/// is attached. 2154void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2155 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2156 return; 2157 2158 QualType MergedT; 2159 if (getLangOpts().CPlusPlus) { 2160 AutoType *AT = New->getType()->getContainedAutoType(); 2161 if (AT && !AT->isDeduced()) { 2162 // We don't know what the new type is until the initializer is attached. 2163 return; 2164 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2165 // These could still be something that needs exception specs checked. 2166 return MergeVarDeclExceptionSpecs(New, Old); 2167 } 2168 // C++ [basic.link]p10: 2169 // [...] the types specified by all declarations referring to a given 2170 // object or function shall be identical, except that declarations for an 2171 // array object can specify array types that differ by the presence or 2172 // absence of a major array bound (8.3.4). 2173 else if (Old->getType()->isIncompleteArrayType() && 2174 New->getType()->isArrayType()) { 2175 CanQual<ArrayType> OldArray 2176 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2177 CanQual<ArrayType> NewArray 2178 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2179 if (OldArray->getElementType() == NewArray->getElementType()) 2180 MergedT = New->getType(); 2181 } else if (Old->getType()->isArrayType() && 2182 New->getType()->isIncompleteArrayType()) { 2183 CanQual<ArrayType> OldArray 2184 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2185 CanQual<ArrayType> NewArray 2186 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2187 if (OldArray->getElementType() == NewArray->getElementType()) 2188 MergedT = Old->getType(); 2189 } else if (New->getType()->isObjCObjectPointerType() 2190 && Old->getType()->isObjCObjectPointerType()) { 2191 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2192 Old->getType()); 2193 } 2194 } else { 2195 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2196 } 2197 if (MergedT.isNull()) { 2198 Diag(New->getLocation(), diag::err_redefinition_different_type) 2199 << New->getDeclName(); 2200 Diag(Old->getLocation(), diag::note_previous_definition); 2201 return New->setInvalidDecl(); 2202 } 2203 New->setType(MergedT); 2204} 2205 2206/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2207/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2208/// situation, merging decls or emitting diagnostics as appropriate. 2209/// 2210/// Tentative definition rules (C99 6.9.2p2) are checked by 2211/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2212/// definitions here, since the initializer hasn't been attached. 2213/// 2214void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2215 // If the new decl is already invalid, don't do any other checking. 2216 if (New->isInvalidDecl()) 2217 return; 2218 2219 // Verify the old decl was also a variable. 2220 VarDecl *Old = 0; 2221 if (!Previous.isSingleResult() || 2222 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2223 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2224 << New->getDeclName(); 2225 Diag(Previous.getRepresentativeDecl()->getLocation(), 2226 diag::note_previous_definition); 2227 return New->setInvalidDecl(); 2228 } 2229 2230 // C++ [class.mem]p1: 2231 // A member shall not be declared twice in the member-specification [...] 2232 // 2233 // Here, we need only consider static data members. 2234 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2235 Diag(New->getLocation(), diag::err_duplicate_member) 2236 << New->getIdentifier(); 2237 Diag(Old->getLocation(), diag::note_previous_declaration); 2238 New->setInvalidDecl(); 2239 } 2240 2241 mergeDeclAttributes(New, Old); 2242 // Warn if an already-declared variable is made a weak_import in a subsequent 2243 // declaration 2244 if (New->getAttr<WeakImportAttr>() && 2245 Old->getStorageClass() == SC_None && 2246 !Old->getAttr<WeakImportAttr>()) { 2247 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2248 Diag(Old->getLocation(), diag::note_previous_definition); 2249 // Remove weak_import attribute on new declaration. 2250 New->dropAttr<WeakImportAttr>(); 2251 } 2252 2253 // Merge the types. 2254 MergeVarDeclTypes(New, Old); 2255 if (New->isInvalidDecl()) 2256 return; 2257 2258 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2259 if (New->getStorageClass() == SC_Static && 2260 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2261 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2262 Diag(Old->getLocation(), diag::note_previous_definition); 2263 return New->setInvalidDecl(); 2264 } 2265 // C99 6.2.2p4: 2266 // For an identifier declared with the storage-class specifier 2267 // extern in a scope in which a prior declaration of that 2268 // identifier is visible,23) if the prior declaration specifies 2269 // internal or external linkage, the linkage of the identifier at 2270 // the later declaration is the same as the linkage specified at 2271 // the prior declaration. If no prior declaration is visible, or 2272 // if the prior declaration specifies no linkage, then the 2273 // identifier has external linkage. 2274 if (New->hasExternalStorage() && Old->hasLinkage()) 2275 /* Okay */; 2276 else if (New->getStorageClass() != SC_Static && 2277 Old->getStorageClass() == SC_Static) { 2278 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2279 Diag(Old->getLocation(), diag::note_previous_definition); 2280 return New->setInvalidDecl(); 2281 } 2282 2283 // Check if extern is followed by non-extern and vice-versa. 2284 if (New->hasExternalStorage() && 2285 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2286 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2287 Diag(Old->getLocation(), diag::note_previous_definition); 2288 return New->setInvalidDecl(); 2289 } 2290 if (Old->hasExternalStorage() && 2291 !New->hasLinkage() && New->isLocalVarDecl()) { 2292 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2293 Diag(Old->getLocation(), diag::note_previous_definition); 2294 return New->setInvalidDecl(); 2295 } 2296 2297 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2298 2299 // FIXME: The test for external storage here seems wrong? We still 2300 // need to check for mismatches. 2301 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2302 // Don't complain about out-of-line definitions of static members. 2303 !(Old->getLexicalDeclContext()->isRecord() && 2304 !New->getLexicalDeclContext()->isRecord())) { 2305 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2306 Diag(Old->getLocation(), diag::note_previous_definition); 2307 return New->setInvalidDecl(); 2308 } 2309 2310 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2311 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2312 Diag(Old->getLocation(), diag::note_previous_definition); 2313 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2314 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2315 Diag(Old->getLocation(), diag::note_previous_definition); 2316 } 2317 2318 // C++ doesn't have tentative definitions, so go right ahead and check here. 2319 const VarDecl *Def; 2320 if (getLangOpts().CPlusPlus && 2321 New->isThisDeclarationADefinition() == VarDecl::Definition && 2322 (Def = Old->getDefinition())) { 2323 Diag(New->getLocation(), diag::err_redefinition) 2324 << New->getDeclName(); 2325 Diag(Def->getLocation(), diag::note_previous_definition); 2326 New->setInvalidDecl(); 2327 return; 2328 } 2329 // c99 6.2.2 P4. 2330 // For an identifier declared with the storage-class specifier extern in a 2331 // scope in which a prior declaration of that identifier is visible, if 2332 // the prior declaration specifies internal or external linkage, the linkage 2333 // of the identifier at the later declaration is the same as the linkage 2334 // specified at the prior declaration. 2335 // FIXME. revisit this code. 2336 if (New->hasExternalStorage() && 2337 Old->getLinkage() == InternalLinkage && 2338 New->getDeclContext() == Old->getDeclContext()) 2339 New->setStorageClass(Old->getStorageClass()); 2340 2341 // Keep a chain of previous declarations. 2342 New->setPreviousDeclaration(Old); 2343 2344 // Inherit access appropriately. 2345 New->setAccess(Old->getAccess()); 2346} 2347 2348/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2349/// no declarator (e.g. "struct foo;") is parsed. 2350Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2351 DeclSpec &DS) { 2352 return ParsedFreeStandingDeclSpec(S, AS, DS, 2353 MultiTemplateParamsArg(*this, 0, 0)); 2354} 2355 2356/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2357/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2358/// parameters to cope with template friend declarations. 2359Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2360 DeclSpec &DS, 2361 MultiTemplateParamsArg TemplateParams) { 2362 Decl *TagD = 0; 2363 TagDecl *Tag = 0; 2364 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2365 DS.getTypeSpecType() == DeclSpec::TST_struct || 2366 DS.getTypeSpecType() == DeclSpec::TST_union || 2367 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2368 TagD = DS.getRepAsDecl(); 2369 2370 if (!TagD) // We probably had an error 2371 return 0; 2372 2373 // Note that the above type specs guarantee that the 2374 // type rep is a Decl, whereas in many of the others 2375 // it's a Type. 2376 if (isa<TagDecl>(TagD)) 2377 Tag = cast<TagDecl>(TagD); 2378 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2379 Tag = CTD->getTemplatedDecl(); 2380 } 2381 2382 if (Tag) { 2383 Tag->setFreeStanding(); 2384 if (Tag->isInvalidDecl()) 2385 return Tag; 2386 } 2387 2388 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2389 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2390 // or incomplete types shall not be restrict-qualified." 2391 if (TypeQuals & DeclSpec::TQ_restrict) 2392 Diag(DS.getRestrictSpecLoc(), 2393 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2394 << DS.getSourceRange(); 2395 } 2396 2397 if (DS.isConstexprSpecified()) { 2398 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2399 // and definitions of functions and variables. 2400 if (Tag) 2401 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2402 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2403 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2404 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2405 else 2406 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2407 // Don't emit warnings after this error. 2408 return TagD; 2409 } 2410 2411 if (DS.isFriendSpecified()) { 2412 // If we're dealing with a decl but not a TagDecl, assume that 2413 // whatever routines created it handled the friendship aspect. 2414 if (TagD && !Tag) 2415 return 0; 2416 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2417 } 2418 2419 // Track whether we warned about the fact that there aren't any 2420 // declarators. 2421 bool emittedWarning = false; 2422 2423 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2424 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2425 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2426 if (getLangOpts().CPlusPlus || 2427 Record->getDeclContext()->isRecord()) 2428 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2429 2430 Diag(DS.getLocStart(), diag::ext_no_declarators) 2431 << DS.getSourceRange(); 2432 emittedWarning = true; 2433 } 2434 } 2435 2436 // Check for Microsoft C extension: anonymous struct. 2437 if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus && 2438 CurContext->isRecord() && 2439 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2440 // Handle 2 kinds of anonymous struct: 2441 // struct STRUCT; 2442 // and 2443 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2444 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2445 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2446 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2447 DS.getRepAsType().get()->isStructureType())) { 2448 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct) 2449 << DS.getSourceRange(); 2450 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2451 } 2452 } 2453 2454 if (getLangOpts().CPlusPlus && 2455 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2456 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2457 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2458 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2459 Diag(Enum->getLocation(), diag::ext_no_declarators) 2460 << DS.getSourceRange(); 2461 emittedWarning = true; 2462 } 2463 2464 // Skip all the checks below if we have a type error. 2465 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2466 2467 if (!DS.isMissingDeclaratorOk()) { 2468 // Warn about typedefs of enums without names, since this is an 2469 // extension in both Microsoft and GNU. 2470 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2471 Tag && isa<EnumDecl>(Tag)) { 2472 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name) 2473 << DS.getSourceRange(); 2474 return Tag; 2475 } 2476 2477 Diag(DS.getLocStart(), diag::ext_no_declarators) 2478 << DS.getSourceRange(); 2479 emittedWarning = true; 2480 } 2481 2482 // We're going to complain about a bunch of spurious specifiers; 2483 // only do this if we're declaring a tag, because otherwise we 2484 // should be getting diag::ext_no_declarators. 2485 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2486 return TagD; 2487 2488 // Note that a linkage-specification sets a storage class, but 2489 // 'extern "C" struct foo;' is actually valid and not theoretically 2490 // useless. 2491 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2492 if (!DS.isExternInLinkageSpec()) 2493 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2494 << DeclSpec::getSpecifierName(scs); 2495 2496 if (DS.isThreadSpecified()) 2497 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2498 if (DS.getTypeQualifiers()) { 2499 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2500 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2501 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2502 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2503 // Restrict is covered above. 2504 } 2505 if (DS.isInlineSpecified()) 2506 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2507 if (DS.isVirtualSpecified()) 2508 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2509 if (DS.isExplicitSpecified()) 2510 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2511 2512 if (DS.isModulePrivateSpecified() && 2513 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2514 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2515 << Tag->getTagKind() 2516 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2517 2518 // Warn about ignored type attributes, for example: 2519 // __attribute__((aligned)) struct A; 2520 // Attributes should be placed after tag to apply to type declaration. 2521 if (!DS.getAttributes().empty()) { 2522 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2523 if (TypeSpecType == DeclSpec::TST_class || 2524 TypeSpecType == DeclSpec::TST_struct || 2525 TypeSpecType == DeclSpec::TST_union || 2526 TypeSpecType == DeclSpec::TST_enum) { 2527 AttributeList* attrs = DS.getAttributes().getList(); 2528 while (attrs) { 2529 Diag(attrs->getScopeLoc(), 2530 diag::warn_declspec_attribute_ignored) 2531 << attrs->getName() 2532 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2533 TypeSpecType == DeclSpec::TST_struct ? 1 : 2534 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2535 attrs = attrs->getNext(); 2536 } 2537 } 2538 } 2539 2540 return TagD; 2541} 2542 2543/// We are trying to inject an anonymous member into the given scope; 2544/// check if there's an existing declaration that can't be overloaded. 2545/// 2546/// \return true if this is a forbidden redeclaration 2547static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2548 Scope *S, 2549 DeclContext *Owner, 2550 DeclarationName Name, 2551 SourceLocation NameLoc, 2552 unsigned diagnostic) { 2553 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2554 Sema::ForRedeclaration); 2555 if (!SemaRef.LookupName(R, S)) return false; 2556 2557 if (R.getAsSingle<TagDecl>()) 2558 return false; 2559 2560 // Pick a representative declaration. 2561 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2562 assert(PrevDecl && "Expected a non-null Decl"); 2563 2564 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2565 return false; 2566 2567 SemaRef.Diag(NameLoc, diagnostic) << Name; 2568 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2569 2570 return true; 2571} 2572 2573/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2574/// anonymous struct or union AnonRecord into the owning context Owner 2575/// and scope S. This routine will be invoked just after we realize 2576/// that an unnamed union or struct is actually an anonymous union or 2577/// struct, e.g., 2578/// 2579/// @code 2580/// union { 2581/// int i; 2582/// float f; 2583/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2584/// // f into the surrounding scope.x 2585/// @endcode 2586/// 2587/// This routine is recursive, injecting the names of nested anonymous 2588/// structs/unions into the owning context and scope as well. 2589static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2590 DeclContext *Owner, 2591 RecordDecl *AnonRecord, 2592 AccessSpecifier AS, 2593 SmallVector<NamedDecl*, 2> &Chaining, 2594 bool MSAnonStruct) { 2595 unsigned diagKind 2596 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2597 : diag::err_anonymous_struct_member_redecl; 2598 2599 bool Invalid = false; 2600 2601 // Look every FieldDecl and IndirectFieldDecl with a name. 2602 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2603 DEnd = AnonRecord->decls_end(); 2604 D != DEnd; ++D) { 2605 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2606 cast<NamedDecl>(*D)->getDeclName()) { 2607 ValueDecl *VD = cast<ValueDecl>(*D); 2608 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2609 VD->getLocation(), diagKind)) { 2610 // C++ [class.union]p2: 2611 // The names of the members of an anonymous union shall be 2612 // distinct from the names of any other entity in the 2613 // scope in which the anonymous union is declared. 2614 Invalid = true; 2615 } else { 2616 // C++ [class.union]p2: 2617 // For the purpose of name lookup, after the anonymous union 2618 // definition, the members of the anonymous union are 2619 // considered to have been defined in the scope in which the 2620 // anonymous union is declared. 2621 unsigned OldChainingSize = Chaining.size(); 2622 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2623 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2624 PE = IF->chain_end(); PI != PE; ++PI) 2625 Chaining.push_back(*PI); 2626 else 2627 Chaining.push_back(VD); 2628 2629 assert(Chaining.size() >= 2); 2630 NamedDecl **NamedChain = 2631 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2632 for (unsigned i = 0; i < Chaining.size(); i++) 2633 NamedChain[i] = Chaining[i]; 2634 2635 IndirectFieldDecl* IndirectField = 2636 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2637 VD->getIdentifier(), VD->getType(), 2638 NamedChain, Chaining.size()); 2639 2640 IndirectField->setAccess(AS); 2641 IndirectField->setImplicit(); 2642 SemaRef.PushOnScopeChains(IndirectField, S); 2643 2644 // That includes picking up the appropriate access specifier. 2645 if (AS != AS_none) IndirectField->setAccess(AS); 2646 2647 Chaining.resize(OldChainingSize); 2648 } 2649 } 2650 } 2651 2652 return Invalid; 2653} 2654 2655/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2656/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2657/// illegal input values are mapped to SC_None. 2658static StorageClass 2659StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2660 switch (StorageClassSpec) { 2661 case DeclSpec::SCS_unspecified: return SC_None; 2662 case DeclSpec::SCS_extern: return SC_Extern; 2663 case DeclSpec::SCS_static: return SC_Static; 2664 case DeclSpec::SCS_auto: return SC_Auto; 2665 case DeclSpec::SCS_register: return SC_Register; 2666 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2667 // Illegal SCSs map to None: error reporting is up to the caller. 2668 case DeclSpec::SCS_mutable: // Fall through. 2669 case DeclSpec::SCS_typedef: return SC_None; 2670 } 2671 llvm_unreachable("unknown storage class specifier"); 2672} 2673 2674/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2675/// a StorageClass. Any error reporting is up to the caller: 2676/// illegal input values are mapped to SC_None. 2677static StorageClass 2678StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2679 switch (StorageClassSpec) { 2680 case DeclSpec::SCS_unspecified: return SC_None; 2681 case DeclSpec::SCS_extern: return SC_Extern; 2682 case DeclSpec::SCS_static: return SC_Static; 2683 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2684 // Illegal SCSs map to None: error reporting is up to the caller. 2685 case DeclSpec::SCS_auto: // Fall through. 2686 case DeclSpec::SCS_mutable: // Fall through. 2687 case DeclSpec::SCS_register: // Fall through. 2688 case DeclSpec::SCS_typedef: return SC_None; 2689 } 2690 llvm_unreachable("unknown storage class specifier"); 2691} 2692 2693/// BuildAnonymousStructOrUnion - Handle the declaration of an 2694/// anonymous structure or union. Anonymous unions are a C++ feature 2695/// (C++ [class.union]) and a C11 feature; anonymous structures 2696/// are a C11 feature and GNU C++ extension. 2697Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2698 AccessSpecifier AS, 2699 RecordDecl *Record) { 2700 DeclContext *Owner = Record->getDeclContext(); 2701 2702 // Diagnose whether this anonymous struct/union is an extension. 2703 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11) 2704 Diag(Record->getLocation(), diag::ext_anonymous_union); 2705 else if (!Record->isUnion() && getLangOpts().CPlusPlus) 2706 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2707 else if (!Record->isUnion() && !getLangOpts().C11) 2708 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2709 2710 // C and C++ require different kinds of checks for anonymous 2711 // structs/unions. 2712 bool Invalid = false; 2713 if (getLangOpts().CPlusPlus) { 2714 const char* PrevSpec = 0; 2715 unsigned DiagID; 2716 if (Record->isUnion()) { 2717 // C++ [class.union]p6: 2718 // Anonymous unions declared in a named namespace or in the 2719 // global namespace shall be declared static. 2720 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2721 (isa<TranslationUnitDecl>(Owner) || 2722 (isa<NamespaceDecl>(Owner) && 2723 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2724 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2725 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2726 2727 // Recover by adding 'static'. 2728 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2729 PrevSpec, DiagID); 2730 } 2731 // C++ [class.union]p6: 2732 // A storage class is not allowed in a declaration of an 2733 // anonymous union in a class scope. 2734 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2735 isa<RecordDecl>(Owner)) { 2736 Diag(DS.getStorageClassSpecLoc(), 2737 diag::err_anonymous_union_with_storage_spec) 2738 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2739 2740 // Recover by removing the storage specifier. 2741 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2742 SourceLocation(), 2743 PrevSpec, DiagID); 2744 } 2745 } 2746 2747 // Ignore const/volatile/restrict qualifiers. 2748 if (DS.getTypeQualifiers()) { 2749 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2750 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2751 << Record->isUnion() << 0 2752 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2753 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2754 Diag(DS.getVolatileSpecLoc(), 2755 diag::ext_anonymous_struct_union_qualified) 2756 << Record->isUnion() << 1 2757 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2758 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2759 Diag(DS.getRestrictSpecLoc(), 2760 diag::ext_anonymous_struct_union_qualified) 2761 << Record->isUnion() << 2 2762 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2763 2764 DS.ClearTypeQualifiers(); 2765 } 2766 2767 // C++ [class.union]p2: 2768 // The member-specification of an anonymous union shall only 2769 // define non-static data members. [Note: nested types and 2770 // functions cannot be declared within an anonymous union. ] 2771 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2772 MemEnd = Record->decls_end(); 2773 Mem != MemEnd; ++Mem) { 2774 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2775 // C++ [class.union]p3: 2776 // An anonymous union shall not have private or protected 2777 // members (clause 11). 2778 assert(FD->getAccess() != AS_none); 2779 if (FD->getAccess() != AS_public) { 2780 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2781 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2782 Invalid = true; 2783 } 2784 2785 // C++ [class.union]p1 2786 // An object of a class with a non-trivial constructor, a non-trivial 2787 // copy constructor, a non-trivial destructor, or a non-trivial copy 2788 // assignment operator cannot be a member of a union, nor can an 2789 // array of such objects. 2790 if (CheckNontrivialField(FD)) 2791 Invalid = true; 2792 } else if ((*Mem)->isImplicit()) { 2793 // Any implicit members are fine. 2794 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2795 // This is a type that showed up in an 2796 // elaborated-type-specifier inside the anonymous struct or 2797 // union, but which actually declares a type outside of the 2798 // anonymous struct or union. It's okay. 2799 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2800 if (!MemRecord->isAnonymousStructOrUnion() && 2801 MemRecord->getDeclName()) { 2802 // Visual C++ allows type definition in anonymous struct or union. 2803 if (getLangOpts().MicrosoftExt) 2804 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2805 << (int)Record->isUnion(); 2806 else { 2807 // This is a nested type declaration. 2808 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2809 << (int)Record->isUnion(); 2810 Invalid = true; 2811 } 2812 } 2813 } else if (isa<AccessSpecDecl>(*Mem)) { 2814 // Any access specifier is fine. 2815 } else { 2816 // We have something that isn't a non-static data 2817 // member. Complain about it. 2818 unsigned DK = diag::err_anonymous_record_bad_member; 2819 if (isa<TypeDecl>(*Mem)) 2820 DK = diag::err_anonymous_record_with_type; 2821 else if (isa<FunctionDecl>(*Mem)) 2822 DK = diag::err_anonymous_record_with_function; 2823 else if (isa<VarDecl>(*Mem)) 2824 DK = diag::err_anonymous_record_with_static; 2825 2826 // Visual C++ allows type definition in anonymous struct or union. 2827 if (getLangOpts().MicrosoftExt && 2828 DK == diag::err_anonymous_record_with_type) 2829 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2830 << (int)Record->isUnion(); 2831 else { 2832 Diag((*Mem)->getLocation(), DK) 2833 << (int)Record->isUnion(); 2834 Invalid = true; 2835 } 2836 } 2837 } 2838 } 2839 2840 if (!Record->isUnion() && !Owner->isRecord()) { 2841 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2842 << (int)getLangOpts().CPlusPlus; 2843 Invalid = true; 2844 } 2845 2846 // Mock up a declarator. 2847 Declarator Dc(DS, Declarator::MemberContext); 2848 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2849 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2850 2851 // Create a declaration for this anonymous struct/union. 2852 NamedDecl *Anon = 0; 2853 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2854 Anon = FieldDecl::Create(Context, OwningClass, 2855 DS.getLocStart(), 2856 Record->getLocation(), 2857 /*IdentifierInfo=*/0, 2858 Context.getTypeDeclType(Record), 2859 TInfo, 2860 /*BitWidth=*/0, /*Mutable=*/false, 2861 /*HasInit=*/false); 2862 Anon->setAccess(AS); 2863 if (getLangOpts().CPlusPlus) 2864 FieldCollector->Add(cast<FieldDecl>(Anon)); 2865 } else { 2866 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2867 assert(SCSpec != DeclSpec::SCS_typedef && 2868 "Parser allowed 'typedef' as storage class VarDecl."); 2869 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2870 if (SCSpec == DeclSpec::SCS_mutable) { 2871 // mutable can only appear on non-static class members, so it's always 2872 // an error here 2873 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2874 Invalid = true; 2875 SC = SC_None; 2876 } 2877 SCSpec = DS.getStorageClassSpecAsWritten(); 2878 VarDecl::StorageClass SCAsWritten 2879 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2880 2881 Anon = VarDecl::Create(Context, Owner, 2882 DS.getLocStart(), 2883 Record->getLocation(), /*IdentifierInfo=*/0, 2884 Context.getTypeDeclType(Record), 2885 TInfo, SC, SCAsWritten); 2886 2887 // Default-initialize the implicit variable. This initialization will be 2888 // trivial in almost all cases, except if a union member has an in-class 2889 // initializer: 2890 // union { int n = 0; }; 2891 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2892 } 2893 Anon->setImplicit(); 2894 2895 // Add the anonymous struct/union object to the current 2896 // context. We'll be referencing this object when we refer to one of 2897 // its members. 2898 Owner->addDecl(Anon); 2899 2900 // Inject the members of the anonymous struct/union into the owning 2901 // context and into the identifier resolver chain for name lookup 2902 // purposes. 2903 SmallVector<NamedDecl*, 2> Chain; 2904 Chain.push_back(Anon); 2905 2906 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2907 Chain, false)) 2908 Invalid = true; 2909 2910 // Mark this as an anonymous struct/union type. Note that we do not 2911 // do this until after we have already checked and injected the 2912 // members of this anonymous struct/union type, because otherwise 2913 // the members could be injected twice: once by DeclContext when it 2914 // builds its lookup table, and once by 2915 // InjectAnonymousStructOrUnionMembers. 2916 Record->setAnonymousStructOrUnion(true); 2917 2918 if (Invalid) 2919 Anon->setInvalidDecl(); 2920 2921 return Anon; 2922} 2923 2924/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2925/// Microsoft C anonymous structure. 2926/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2927/// Example: 2928/// 2929/// struct A { int a; }; 2930/// struct B { struct A; int b; }; 2931/// 2932/// void foo() { 2933/// B var; 2934/// var.a = 3; 2935/// } 2936/// 2937Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2938 RecordDecl *Record) { 2939 2940 // If there is no Record, get the record via the typedef. 2941 if (!Record) 2942 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2943 2944 // Mock up a declarator. 2945 Declarator Dc(DS, Declarator::TypeNameContext); 2946 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2947 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2948 2949 // Create a declaration for this anonymous struct. 2950 NamedDecl* Anon = FieldDecl::Create(Context, 2951 cast<RecordDecl>(CurContext), 2952 DS.getLocStart(), 2953 DS.getLocStart(), 2954 /*IdentifierInfo=*/0, 2955 Context.getTypeDeclType(Record), 2956 TInfo, 2957 /*BitWidth=*/0, /*Mutable=*/false, 2958 /*HasInit=*/false); 2959 Anon->setImplicit(); 2960 2961 // Add the anonymous struct object to the current context. 2962 CurContext->addDecl(Anon); 2963 2964 // Inject the members of the anonymous struct into the current 2965 // context and into the identifier resolver chain for name lookup 2966 // purposes. 2967 SmallVector<NamedDecl*, 2> Chain; 2968 Chain.push_back(Anon); 2969 2970 RecordDecl *RecordDef = Record->getDefinition(); 2971 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2972 RecordDef, AS_none, 2973 Chain, true)) 2974 Anon->setInvalidDecl(); 2975 2976 return Anon; 2977} 2978 2979/// GetNameForDeclarator - Determine the full declaration name for the 2980/// given Declarator. 2981DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2982 return GetNameFromUnqualifiedId(D.getName()); 2983} 2984 2985/// \brief Retrieves the declaration name from a parsed unqualified-id. 2986DeclarationNameInfo 2987Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2988 DeclarationNameInfo NameInfo; 2989 NameInfo.setLoc(Name.StartLocation); 2990 2991 switch (Name.getKind()) { 2992 2993 case UnqualifiedId::IK_ImplicitSelfParam: 2994 case UnqualifiedId::IK_Identifier: 2995 NameInfo.setName(Name.Identifier); 2996 NameInfo.setLoc(Name.StartLocation); 2997 return NameInfo; 2998 2999 case UnqualifiedId::IK_OperatorFunctionId: 3000 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 3001 Name.OperatorFunctionId.Operator)); 3002 NameInfo.setLoc(Name.StartLocation); 3003 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 3004 = Name.OperatorFunctionId.SymbolLocations[0]; 3005 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 3006 = Name.EndLocation.getRawEncoding(); 3007 return NameInfo; 3008 3009 case UnqualifiedId::IK_LiteralOperatorId: 3010 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 3011 Name.Identifier)); 3012 NameInfo.setLoc(Name.StartLocation); 3013 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3014 return NameInfo; 3015 3016 case UnqualifiedId::IK_ConversionFunctionId: { 3017 TypeSourceInfo *TInfo; 3018 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3019 if (Ty.isNull()) 3020 return DeclarationNameInfo(); 3021 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3022 Context.getCanonicalType(Ty))); 3023 NameInfo.setLoc(Name.StartLocation); 3024 NameInfo.setNamedTypeInfo(TInfo); 3025 return NameInfo; 3026 } 3027 3028 case UnqualifiedId::IK_ConstructorName: { 3029 TypeSourceInfo *TInfo; 3030 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3031 if (Ty.isNull()) 3032 return DeclarationNameInfo(); 3033 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3034 Context.getCanonicalType(Ty))); 3035 NameInfo.setLoc(Name.StartLocation); 3036 NameInfo.setNamedTypeInfo(TInfo); 3037 return NameInfo; 3038 } 3039 3040 case UnqualifiedId::IK_ConstructorTemplateId: { 3041 // In well-formed code, we can only have a constructor 3042 // template-id that refers to the current context, so go there 3043 // to find the actual type being constructed. 3044 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3045 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3046 return DeclarationNameInfo(); 3047 3048 // Determine the type of the class being constructed. 3049 QualType CurClassType = Context.getTypeDeclType(CurClass); 3050 3051 // FIXME: Check two things: that the template-id names the same type as 3052 // CurClassType, and that the template-id does not occur when the name 3053 // was qualified. 3054 3055 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3056 Context.getCanonicalType(CurClassType))); 3057 NameInfo.setLoc(Name.StartLocation); 3058 // FIXME: should we retrieve TypeSourceInfo? 3059 NameInfo.setNamedTypeInfo(0); 3060 return NameInfo; 3061 } 3062 3063 case UnqualifiedId::IK_DestructorName: { 3064 TypeSourceInfo *TInfo; 3065 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3066 if (Ty.isNull()) 3067 return DeclarationNameInfo(); 3068 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3069 Context.getCanonicalType(Ty))); 3070 NameInfo.setLoc(Name.StartLocation); 3071 NameInfo.setNamedTypeInfo(TInfo); 3072 return NameInfo; 3073 } 3074 3075 case UnqualifiedId::IK_TemplateId: { 3076 TemplateName TName = Name.TemplateId->Template.get(); 3077 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3078 return Context.getNameForTemplate(TName, TNameLoc); 3079 } 3080 3081 } // switch (Name.getKind()) 3082 3083 llvm_unreachable("Unknown name kind"); 3084} 3085 3086static QualType getCoreType(QualType Ty) { 3087 do { 3088 if (Ty->isPointerType() || Ty->isReferenceType()) 3089 Ty = Ty->getPointeeType(); 3090 else if (Ty->isArrayType()) 3091 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3092 else 3093 return Ty.withoutLocalFastQualifiers(); 3094 } while (true); 3095} 3096 3097/// hasSimilarParameters - Determine whether the C++ functions Declaration 3098/// and Definition have "nearly" matching parameters. This heuristic is 3099/// used to improve diagnostics in the case where an out-of-line function 3100/// definition doesn't match any declaration within the class or namespace. 3101/// Also sets Params to the list of indices to the parameters that differ 3102/// between the declaration and the definition. If hasSimilarParameters 3103/// returns true and Params is empty, then all of the parameters match. 3104static bool hasSimilarParameters(ASTContext &Context, 3105 FunctionDecl *Declaration, 3106 FunctionDecl *Definition, 3107 llvm::SmallVectorImpl<unsigned> &Params) { 3108 Params.clear(); 3109 if (Declaration->param_size() != Definition->param_size()) 3110 return false; 3111 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3112 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3113 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3114 3115 // The parameter types are identical 3116 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3117 continue; 3118 3119 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3120 QualType DefParamBaseTy = getCoreType(DefParamTy); 3121 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3122 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3123 3124 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3125 (DeclTyName && DeclTyName == DefTyName)) 3126 Params.push_back(Idx); 3127 else // The two parameters aren't even close 3128 return false; 3129 } 3130 3131 return true; 3132} 3133 3134/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3135/// declarator needs to be rebuilt in the current instantiation. 3136/// Any bits of declarator which appear before the name are valid for 3137/// consideration here. That's specifically the type in the decl spec 3138/// and the base type in any member-pointer chunks. 3139static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3140 DeclarationName Name) { 3141 // The types we specifically need to rebuild are: 3142 // - typenames, typeofs, and decltypes 3143 // - types which will become injected class names 3144 // Of course, we also need to rebuild any type referencing such a 3145 // type. It's safest to just say "dependent", but we call out a 3146 // few cases here. 3147 3148 DeclSpec &DS = D.getMutableDeclSpec(); 3149 switch (DS.getTypeSpecType()) { 3150 case DeclSpec::TST_typename: 3151 case DeclSpec::TST_typeofType: 3152 case DeclSpec::TST_decltype: 3153 case DeclSpec::TST_underlyingType: 3154 case DeclSpec::TST_atomic: { 3155 // Grab the type from the parser. 3156 TypeSourceInfo *TSI = 0; 3157 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3158 if (T.isNull() || !T->isDependentType()) break; 3159 3160 // Make sure there's a type source info. This isn't really much 3161 // of a waste; most dependent types should have type source info 3162 // attached already. 3163 if (!TSI) 3164 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3165 3166 // Rebuild the type in the current instantiation. 3167 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3168 if (!TSI) return true; 3169 3170 // Store the new type back in the decl spec. 3171 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3172 DS.UpdateTypeRep(LocType); 3173 break; 3174 } 3175 3176 case DeclSpec::TST_typeofExpr: { 3177 Expr *E = DS.getRepAsExpr(); 3178 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3179 if (Result.isInvalid()) return true; 3180 DS.UpdateExprRep(Result.get()); 3181 break; 3182 } 3183 3184 default: 3185 // Nothing to do for these decl specs. 3186 break; 3187 } 3188 3189 // It doesn't matter what order we do this in. 3190 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3191 DeclaratorChunk &Chunk = D.getTypeObject(I); 3192 3193 // The only type information in the declarator which can come 3194 // before the declaration name is the base type of a member 3195 // pointer. 3196 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3197 continue; 3198 3199 // Rebuild the scope specifier in-place. 3200 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3201 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3202 return true; 3203 } 3204 3205 return false; 3206} 3207 3208Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3209 D.setFunctionDefinitionKind(FDK_Declaration); 3210 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3211 3212 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3213 Dcl->getDeclContext()->isFileContext()) 3214 Dcl->setTopLevelDeclInObjCContainer(); 3215 3216 return Dcl; 3217} 3218 3219/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3220/// If T is the name of a class, then each of the following shall have a 3221/// name different from T: 3222/// - every static data member of class T; 3223/// - every member function of class T 3224/// - every member of class T that is itself a type; 3225/// \returns true if the declaration name violates these rules. 3226bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3227 DeclarationNameInfo NameInfo) { 3228 DeclarationName Name = NameInfo.getName(); 3229 3230 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3231 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3232 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3233 return true; 3234 } 3235 3236 return false; 3237} 3238 3239Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3240 MultiTemplateParamsArg TemplateParamLists) { 3241 // TODO: consider using NameInfo for diagnostic. 3242 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3243 DeclarationName Name = NameInfo.getName(); 3244 3245 // All of these full declarators require an identifier. If it doesn't have 3246 // one, the ParsedFreeStandingDeclSpec action should be used. 3247 if (!Name) { 3248 if (!D.isInvalidType()) // Reject this if we think it is valid. 3249 Diag(D.getDeclSpec().getLocStart(), 3250 diag::err_declarator_need_ident) 3251 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3252 return 0; 3253 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3254 return 0; 3255 3256 // The scope passed in may not be a decl scope. Zip up the scope tree until 3257 // we find one that is. 3258 while ((S->getFlags() & Scope::DeclScope) == 0 || 3259 (S->getFlags() & Scope::TemplateParamScope) != 0) 3260 S = S->getParent(); 3261 3262 DeclContext *DC = CurContext; 3263 if (D.getCXXScopeSpec().isInvalid()) 3264 D.setInvalidType(); 3265 else if (D.getCXXScopeSpec().isSet()) { 3266 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3267 UPPC_DeclarationQualifier)) 3268 return 0; 3269 3270 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3271 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3272 if (!DC) { 3273 // If we could not compute the declaration context, it's because the 3274 // declaration context is dependent but does not refer to a class, 3275 // class template, or class template partial specialization. Complain 3276 // and return early, to avoid the coming semantic disaster. 3277 Diag(D.getIdentifierLoc(), 3278 diag::err_template_qualified_declarator_no_match) 3279 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3280 << D.getCXXScopeSpec().getRange(); 3281 return 0; 3282 } 3283 bool IsDependentContext = DC->isDependentContext(); 3284 3285 if (!IsDependentContext && 3286 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3287 return 0; 3288 3289 if (isa<CXXRecordDecl>(DC)) { 3290 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3291 Diag(D.getIdentifierLoc(), 3292 diag::err_member_def_undefined_record) 3293 << Name << DC << D.getCXXScopeSpec().getRange(); 3294 D.setInvalidType(); 3295 } else if (isa<CXXRecordDecl>(CurContext) && 3296 !D.getDeclSpec().isFriendSpecified()) { 3297 // The user provided a superfluous scope specifier inside a class 3298 // definition: 3299 // 3300 // class X { 3301 // void X::f(); 3302 // }; 3303 if (CurContext->Equals(DC)) { 3304 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3305 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3306 } else { 3307 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3308 << Name << D.getCXXScopeSpec().getRange(); 3309 3310 // C++ constructors and destructors with incorrect scopes can break 3311 // our AST invariants by having the wrong underlying types. If 3312 // that's the case, then drop this declaration entirely. 3313 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3314 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3315 !Context.hasSameType(Name.getCXXNameType(), 3316 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3317 return 0; 3318 } 3319 3320 // Pretend that this qualifier was not here. 3321 D.getCXXScopeSpec().clear(); 3322 } 3323 } 3324 3325 // Check whether we need to rebuild the type of the given 3326 // declaration in the current instantiation. 3327 if (EnteringContext && IsDependentContext && 3328 TemplateParamLists.size() != 0) { 3329 ContextRAII SavedContext(*this, DC); 3330 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3331 D.setInvalidType(); 3332 } 3333 } 3334 3335 if (DiagnoseClassNameShadow(DC, NameInfo)) 3336 // If this is a typedef, we'll end up spewing multiple diagnostics. 3337 // Just return early; it's safer. 3338 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3339 return 0; 3340 3341 NamedDecl *New; 3342 3343 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3344 QualType R = TInfo->getType(); 3345 3346 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3347 UPPC_DeclarationType)) 3348 D.setInvalidType(); 3349 3350 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3351 ForRedeclaration); 3352 3353 // See if this is a redefinition of a variable in the same scope. 3354 if (!D.getCXXScopeSpec().isSet()) { 3355 bool IsLinkageLookup = false; 3356 3357 // If the declaration we're planning to build will be a function 3358 // or object with linkage, then look for another declaration with 3359 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3360 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3361 /* Do nothing*/; 3362 else if (R->isFunctionType()) { 3363 if (CurContext->isFunctionOrMethod() || 3364 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3365 IsLinkageLookup = true; 3366 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3367 IsLinkageLookup = true; 3368 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3369 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3370 IsLinkageLookup = true; 3371 3372 if (IsLinkageLookup) 3373 Previous.clear(LookupRedeclarationWithLinkage); 3374 3375 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3376 } else { // Something like "int foo::x;" 3377 LookupQualifiedName(Previous, DC); 3378 3379 // Don't consider using declarations as previous declarations for 3380 // out-of-line members. 3381 RemoveUsingDecls(Previous); 3382 3383 // C++ 7.3.1.2p2: 3384 // Members (including explicit specializations of templates) of a named 3385 // namespace can also be defined outside that namespace by explicit 3386 // qualification of the name being defined, provided that the entity being 3387 // defined was already declared in the namespace and the definition appears 3388 // after the point of declaration in a namespace that encloses the 3389 // declarations namespace. 3390 // 3391 // Note that we only check the context at this point. We don't yet 3392 // have enough information to make sure that PrevDecl is actually 3393 // the declaration we want to match. For example, given: 3394 // 3395 // class X { 3396 // void f(); 3397 // void f(float); 3398 // }; 3399 // 3400 // void X::f(int) { } // ill-formed 3401 // 3402 // In this case, PrevDecl will point to the overload set 3403 // containing the two f's declared in X, but neither of them 3404 // matches. 3405 3406 // First check whether we named the global scope. 3407 if (isa<TranslationUnitDecl>(DC)) { 3408 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3409 << Name << D.getCXXScopeSpec().getRange(); 3410 } else { 3411 DeclContext *Cur = CurContext; 3412 while (isa<LinkageSpecDecl>(Cur)) 3413 Cur = Cur->getParent(); 3414 if (!Cur->Encloses(DC)) { 3415 // The qualifying scope doesn't enclose the original declaration. 3416 // Emit diagnostic based on current scope. 3417 SourceLocation L = D.getIdentifierLoc(); 3418 SourceRange R = D.getCXXScopeSpec().getRange(); 3419 if (isa<FunctionDecl>(Cur)) 3420 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3421 else 3422 Diag(L, diag::err_invalid_declarator_scope) 3423 << Name << cast<NamedDecl>(DC) << R; 3424 D.setInvalidType(); 3425 } 3426 3427 // C++11 8.3p1: 3428 // ... "The nested-name-specifier of the qualified declarator-id shall 3429 // not begin with a decltype-specifer" 3430 NestedNameSpecifierLoc SpecLoc = 3431 D.getCXXScopeSpec().getWithLocInContext(Context); 3432 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3433 "NestedNameSpecifierLoc"); 3434 while (SpecLoc.getPrefix()) 3435 SpecLoc = SpecLoc.getPrefix(); 3436 if (dyn_cast_or_null<DecltypeType>( 3437 SpecLoc.getNestedNameSpecifier()->getAsType())) 3438 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3439 << SpecLoc.getTypeLoc().getSourceRange(); 3440 } 3441 } 3442 3443 if (Previous.isSingleResult() && 3444 Previous.getFoundDecl()->isTemplateParameter()) { 3445 // Maybe we will complain about the shadowed template parameter. 3446 if (!D.isInvalidType()) 3447 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3448 Previous.getFoundDecl()); 3449 3450 // Just pretend that we didn't see the previous declaration. 3451 Previous.clear(); 3452 } 3453 3454 // In C++, the previous declaration we find might be a tag type 3455 // (class or enum). In this case, the new declaration will hide the 3456 // tag type. Note that this does does not apply if we're declaring a 3457 // typedef (C++ [dcl.typedef]p4). 3458 if (Previous.isSingleTagDecl() && 3459 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3460 Previous.clear(); 3461 3462 bool AddToScope = true; 3463 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3464 if (TemplateParamLists.size()) { 3465 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3466 return 0; 3467 } 3468 3469 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3470 } else if (R->isFunctionType()) { 3471 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3472 move(TemplateParamLists), 3473 AddToScope); 3474 } else { 3475 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3476 move(TemplateParamLists)); 3477 } 3478 3479 if (New == 0) 3480 return 0; 3481 3482 // If this has an identifier and is not an invalid redeclaration or 3483 // function template specialization, add it to the scope stack. 3484 if (New->getDeclName() && AddToScope && 3485 !(D.isRedeclaration() && New->isInvalidDecl())) 3486 PushOnScopeChains(New, S); 3487 3488 return New; 3489} 3490 3491/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3492/// types into constant array types in certain situations which would otherwise 3493/// be errors (for GCC compatibility). 3494static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3495 ASTContext &Context, 3496 bool &SizeIsNegative, 3497 llvm::APSInt &Oversized) { 3498 // This method tries to turn a variable array into a constant 3499 // array even when the size isn't an ICE. This is necessary 3500 // for compatibility with code that depends on gcc's buggy 3501 // constant expression folding, like struct {char x[(int)(char*)2];} 3502 SizeIsNegative = false; 3503 Oversized = 0; 3504 3505 if (T->isDependentType()) 3506 return QualType(); 3507 3508 QualifierCollector Qs; 3509 const Type *Ty = Qs.strip(T); 3510 3511 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3512 QualType Pointee = PTy->getPointeeType(); 3513 QualType FixedType = 3514 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3515 Oversized); 3516 if (FixedType.isNull()) return FixedType; 3517 FixedType = Context.getPointerType(FixedType); 3518 return Qs.apply(Context, FixedType); 3519 } 3520 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3521 QualType Inner = PTy->getInnerType(); 3522 QualType FixedType = 3523 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3524 Oversized); 3525 if (FixedType.isNull()) return FixedType; 3526 FixedType = Context.getParenType(FixedType); 3527 return Qs.apply(Context, FixedType); 3528 } 3529 3530 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3531 if (!VLATy) 3532 return QualType(); 3533 // FIXME: We should probably handle this case 3534 if (VLATy->getElementType()->isVariablyModifiedType()) 3535 return QualType(); 3536 3537 llvm::APSInt Res; 3538 if (!VLATy->getSizeExpr() || 3539 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3540 return QualType(); 3541 3542 // Check whether the array size is negative. 3543 if (Res.isSigned() && Res.isNegative()) { 3544 SizeIsNegative = true; 3545 return QualType(); 3546 } 3547 3548 // Check whether the array is too large to be addressed. 3549 unsigned ActiveSizeBits 3550 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3551 Res); 3552 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3553 Oversized = Res; 3554 return QualType(); 3555 } 3556 3557 return Context.getConstantArrayType(VLATy->getElementType(), 3558 Res, ArrayType::Normal, 0); 3559} 3560 3561/// \brief Register the given locally-scoped external C declaration so 3562/// that it can be found later for redeclarations 3563void 3564Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3565 const LookupResult &Previous, 3566 Scope *S) { 3567 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3568 "Decl is not a locally-scoped decl!"); 3569 // Note that we have a locally-scoped external with this name. 3570 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3571 3572 if (!Previous.isSingleResult()) 3573 return; 3574 3575 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3576 3577 // If there was a previous declaration of this variable, it may be 3578 // in our identifier chain. Update the identifier chain with the new 3579 // declaration. 3580 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3581 // The previous declaration was found on the identifer resolver 3582 // chain, so remove it from its scope. 3583 3584 if (S->isDeclScope(PrevDecl)) { 3585 // Special case for redeclarations in the SAME scope. 3586 // Because this declaration is going to be added to the identifier chain 3587 // later, we should temporarily take it OFF the chain. 3588 IdResolver.RemoveDecl(ND); 3589 3590 } else { 3591 // Find the scope for the original declaration. 3592 while (S && !S->isDeclScope(PrevDecl)) 3593 S = S->getParent(); 3594 } 3595 3596 if (S) 3597 S->RemoveDecl(PrevDecl); 3598 } 3599} 3600 3601llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3602Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3603 if (ExternalSource) { 3604 // Load locally-scoped external decls from the external source. 3605 SmallVector<NamedDecl *, 4> Decls; 3606 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3607 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3608 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3609 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3610 if (Pos == LocallyScopedExternalDecls.end()) 3611 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3612 } 3613 } 3614 3615 return LocallyScopedExternalDecls.find(Name); 3616} 3617 3618/// \brief Diagnose function specifiers on a declaration of an identifier that 3619/// does not identify a function. 3620void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3621 // FIXME: We should probably indicate the identifier in question to avoid 3622 // confusion for constructs like "inline int a(), b;" 3623 if (D.getDeclSpec().isInlineSpecified()) 3624 Diag(D.getDeclSpec().getInlineSpecLoc(), 3625 diag::err_inline_non_function); 3626 3627 if (D.getDeclSpec().isVirtualSpecified()) 3628 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3629 diag::err_virtual_non_function); 3630 3631 if (D.getDeclSpec().isExplicitSpecified()) 3632 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3633 diag::err_explicit_non_function); 3634} 3635 3636NamedDecl* 3637Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3638 TypeSourceInfo *TInfo, LookupResult &Previous) { 3639 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3640 if (D.getCXXScopeSpec().isSet()) { 3641 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3642 << D.getCXXScopeSpec().getRange(); 3643 D.setInvalidType(); 3644 // Pretend we didn't see the scope specifier. 3645 DC = CurContext; 3646 Previous.clear(); 3647 } 3648 3649 if (getLangOpts().CPlusPlus) { 3650 // Check that there are no default arguments (C++ only). 3651 CheckExtraCXXDefaultArguments(D); 3652 } 3653 3654 DiagnoseFunctionSpecifiers(D); 3655 3656 if (D.getDeclSpec().isThreadSpecified()) 3657 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3658 if (D.getDeclSpec().isConstexprSpecified()) 3659 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3660 << 1; 3661 3662 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3663 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3664 << D.getName().getSourceRange(); 3665 return 0; 3666 } 3667 3668 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3669 if (!NewTD) return 0; 3670 3671 // Handle attributes prior to checking for duplicates in MergeVarDecl 3672 ProcessDeclAttributes(S, NewTD, D); 3673 3674 CheckTypedefForVariablyModifiedType(S, NewTD); 3675 3676 bool Redeclaration = D.isRedeclaration(); 3677 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3678 D.setRedeclaration(Redeclaration); 3679 return ND; 3680} 3681 3682void 3683Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3684 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3685 // then it shall have block scope. 3686 // Note that variably modified types must be fixed before merging the decl so 3687 // that redeclarations will match. 3688 QualType T = NewTD->getUnderlyingType(); 3689 if (T->isVariablyModifiedType()) { 3690 getCurFunction()->setHasBranchProtectedScope(); 3691 3692 if (S->getFnParent() == 0) { 3693 bool SizeIsNegative; 3694 llvm::APSInt Oversized; 3695 QualType FixedTy = 3696 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3697 Oversized); 3698 if (!FixedTy.isNull()) { 3699 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3700 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3701 } else { 3702 if (SizeIsNegative) 3703 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3704 else if (T->isVariableArrayType()) 3705 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3706 else if (Oversized.getBoolValue()) 3707 Diag(NewTD->getLocation(), diag::err_array_too_large) 3708 << Oversized.toString(10); 3709 else 3710 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3711 NewTD->setInvalidDecl(); 3712 } 3713 } 3714 } 3715} 3716 3717 3718/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3719/// declares a typedef-name, either using the 'typedef' type specifier or via 3720/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3721NamedDecl* 3722Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3723 LookupResult &Previous, bool &Redeclaration) { 3724 // Merge the decl with the existing one if appropriate. If the decl is 3725 // in an outer scope, it isn't the same thing. 3726 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3727 /*ExplicitInstantiationOrSpecialization=*/false); 3728 if (!Previous.empty()) { 3729 Redeclaration = true; 3730 MergeTypedefNameDecl(NewTD, Previous); 3731 } 3732 3733 // If this is the C FILE type, notify the AST context. 3734 if (IdentifierInfo *II = NewTD->getIdentifier()) 3735 if (!NewTD->isInvalidDecl() && 3736 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3737 if (II->isStr("FILE")) 3738 Context.setFILEDecl(NewTD); 3739 else if (II->isStr("jmp_buf")) 3740 Context.setjmp_bufDecl(NewTD); 3741 else if (II->isStr("sigjmp_buf")) 3742 Context.setsigjmp_bufDecl(NewTD); 3743 else if (II->isStr("ucontext_t")) 3744 Context.setucontext_tDecl(NewTD); 3745 else if (II->isStr("__builtin_va_list")) 3746 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3747 } 3748 3749 return NewTD; 3750} 3751 3752/// \brief Determines whether the given declaration is an out-of-scope 3753/// previous declaration. 3754/// 3755/// This routine should be invoked when name lookup has found a 3756/// previous declaration (PrevDecl) that is not in the scope where a 3757/// new declaration by the same name is being introduced. If the new 3758/// declaration occurs in a local scope, previous declarations with 3759/// linkage may still be considered previous declarations (C99 3760/// 6.2.2p4-5, C++ [basic.link]p6). 3761/// 3762/// \param PrevDecl the previous declaration found by name 3763/// lookup 3764/// 3765/// \param DC the context in which the new declaration is being 3766/// declared. 3767/// 3768/// \returns true if PrevDecl is an out-of-scope previous declaration 3769/// for a new delcaration with the same name. 3770static bool 3771isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3772 ASTContext &Context) { 3773 if (!PrevDecl) 3774 return false; 3775 3776 if (!PrevDecl->hasLinkage()) 3777 return false; 3778 3779 if (Context.getLangOpts().CPlusPlus) { 3780 // C++ [basic.link]p6: 3781 // If there is a visible declaration of an entity with linkage 3782 // having the same name and type, ignoring entities declared 3783 // outside the innermost enclosing namespace scope, the block 3784 // scope declaration declares that same entity and receives the 3785 // linkage of the previous declaration. 3786 DeclContext *OuterContext = DC->getRedeclContext(); 3787 if (!OuterContext->isFunctionOrMethod()) 3788 // This rule only applies to block-scope declarations. 3789 return false; 3790 3791 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3792 if (PrevOuterContext->isRecord()) 3793 // We found a member function: ignore it. 3794 return false; 3795 3796 // Find the innermost enclosing namespace for the new and 3797 // previous declarations. 3798 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3799 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3800 3801 // The previous declaration is in a different namespace, so it 3802 // isn't the same function. 3803 if (!OuterContext->Equals(PrevOuterContext)) 3804 return false; 3805 } 3806 3807 return true; 3808} 3809 3810static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3811 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3812 if (!SS.isSet()) return; 3813 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3814} 3815 3816bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3817 QualType type = decl->getType(); 3818 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3819 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3820 // Various kinds of declaration aren't allowed to be __autoreleasing. 3821 unsigned kind = -1U; 3822 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3823 if (var->hasAttr<BlocksAttr>()) 3824 kind = 0; // __block 3825 else if (!var->hasLocalStorage()) 3826 kind = 1; // global 3827 } else if (isa<ObjCIvarDecl>(decl)) { 3828 kind = 3; // ivar 3829 } else if (isa<FieldDecl>(decl)) { 3830 kind = 2; // field 3831 } 3832 3833 if (kind != -1U) { 3834 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3835 << kind; 3836 } 3837 } else if (lifetime == Qualifiers::OCL_None) { 3838 // Try to infer lifetime. 3839 if (!type->isObjCLifetimeType()) 3840 return false; 3841 3842 lifetime = type->getObjCARCImplicitLifetime(); 3843 type = Context.getLifetimeQualifiedType(type, lifetime); 3844 decl->setType(type); 3845 } 3846 3847 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3848 // Thread-local variables cannot have lifetime. 3849 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3850 var->isThreadSpecified()) { 3851 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3852 << var->getType(); 3853 return true; 3854 } 3855 } 3856 3857 return false; 3858} 3859 3860NamedDecl* 3861Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3862 TypeSourceInfo *TInfo, LookupResult &Previous, 3863 MultiTemplateParamsArg TemplateParamLists) { 3864 QualType R = TInfo->getType(); 3865 DeclarationName Name = GetNameForDeclarator(D).getName(); 3866 3867 // Check that there are no default arguments (C++ only). 3868 if (getLangOpts().CPlusPlus) 3869 CheckExtraCXXDefaultArguments(D); 3870 3871 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3872 assert(SCSpec != DeclSpec::SCS_typedef && 3873 "Parser allowed 'typedef' as storage class VarDecl."); 3874 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3875 if (SCSpec == DeclSpec::SCS_mutable) { 3876 // mutable can only appear on non-static class members, so it's always 3877 // an error here 3878 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3879 D.setInvalidType(); 3880 SC = SC_None; 3881 } 3882 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3883 VarDecl::StorageClass SCAsWritten 3884 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3885 3886 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3887 if (!II) { 3888 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3889 << Name; 3890 return 0; 3891 } 3892 3893 DiagnoseFunctionSpecifiers(D); 3894 3895 if (!DC->isRecord() && S->getFnParent() == 0) { 3896 // C99 6.9p2: The storage-class specifiers auto and register shall not 3897 // appear in the declaration specifiers in an external declaration. 3898 if (SC == SC_Auto || SC == SC_Register) { 3899 3900 // If this is a register variable with an asm label specified, then this 3901 // is a GNU extension. 3902 if (SC == SC_Register && D.getAsmLabel()) 3903 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3904 else 3905 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3906 D.setInvalidType(); 3907 } 3908 } 3909 3910 if (getLangOpts().OpenCL) { 3911 // Set up the special work-group-local storage class for variables in the 3912 // OpenCL __local address space. 3913 if (R.getAddressSpace() == LangAS::opencl_local) 3914 SC = SC_OpenCLWorkGroupLocal; 3915 } 3916 3917 bool isExplicitSpecialization = false; 3918 VarDecl *NewVD; 3919 if (!getLangOpts().CPlusPlus) { 3920 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 3921 D.getIdentifierLoc(), II, 3922 R, TInfo, SC, SCAsWritten); 3923 3924 if (D.isInvalidType()) 3925 NewVD->setInvalidDecl(); 3926 } else { 3927 if (DC->isRecord() && !CurContext->isRecord()) { 3928 // This is an out-of-line definition of a static data member. 3929 if (SC == SC_Static) { 3930 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3931 diag::err_static_out_of_line) 3932 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3933 } else if (SC == SC_None) 3934 SC = SC_Static; 3935 } 3936 if (SC == SC_Static && CurContext->isRecord()) { 3937 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3938 if (RD->isLocalClass()) 3939 Diag(D.getIdentifierLoc(), 3940 diag::err_static_data_member_not_allowed_in_local_class) 3941 << Name << RD->getDeclName(); 3942 3943 // C++98 [class.union]p1: If a union contains a static data member, 3944 // the program is ill-formed. C++11 drops this restriction. 3945 if (RD->isUnion()) 3946 Diag(D.getIdentifierLoc(), 3947 getLangOpts().CPlusPlus0x 3948 ? diag::warn_cxx98_compat_static_data_member_in_union 3949 : diag::ext_static_data_member_in_union) << Name; 3950 // We conservatively disallow static data members in anonymous structs. 3951 else if (!RD->getDeclName()) 3952 Diag(D.getIdentifierLoc(), 3953 diag::err_static_data_member_not_allowed_in_anon_struct) 3954 << Name << RD->isUnion(); 3955 } 3956 } 3957 3958 // Match up the template parameter lists with the scope specifier, then 3959 // determine whether we have a template or a template specialization. 3960 isExplicitSpecialization = false; 3961 bool Invalid = false; 3962 if (TemplateParameterList *TemplateParams 3963 = MatchTemplateParametersToScopeSpecifier( 3964 D.getDeclSpec().getLocStart(), 3965 D.getIdentifierLoc(), 3966 D.getCXXScopeSpec(), 3967 TemplateParamLists.get(), 3968 TemplateParamLists.size(), 3969 /*never a friend*/ false, 3970 isExplicitSpecialization, 3971 Invalid)) { 3972 if (TemplateParams->size() > 0) { 3973 // There is no such thing as a variable template. 3974 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3975 << II 3976 << SourceRange(TemplateParams->getTemplateLoc(), 3977 TemplateParams->getRAngleLoc()); 3978 return 0; 3979 } else { 3980 // There is an extraneous 'template<>' for this variable. Complain 3981 // about it, but allow the declaration of the variable. 3982 Diag(TemplateParams->getTemplateLoc(), 3983 diag::err_template_variable_noparams) 3984 << II 3985 << SourceRange(TemplateParams->getTemplateLoc(), 3986 TemplateParams->getRAngleLoc()); 3987 } 3988 } 3989 3990 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 3991 D.getIdentifierLoc(), II, 3992 R, TInfo, SC, SCAsWritten); 3993 3994 // If this decl has an auto type in need of deduction, make a note of the 3995 // Decl so we can diagnose uses of it in its own initializer. 3996 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3997 R->getContainedAutoType()) 3998 ParsingInitForAutoVars.insert(NewVD); 3999 4000 if (D.isInvalidType() || Invalid) 4001 NewVD->setInvalidDecl(); 4002 4003 SetNestedNameSpecifier(NewVD, D); 4004 4005 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 4006 NewVD->setTemplateParameterListsInfo(Context, 4007 TemplateParamLists.size(), 4008 TemplateParamLists.release()); 4009 } 4010 4011 if (D.getDeclSpec().isConstexprSpecified()) 4012 NewVD->setConstexpr(true); 4013 } 4014 4015 // Set the lexical context. If the declarator has a C++ scope specifier, the 4016 // lexical context will be different from the semantic context. 4017 NewVD->setLexicalDeclContext(CurContext); 4018 4019 if (D.getDeclSpec().isThreadSpecified()) { 4020 if (NewVD->hasLocalStorage()) 4021 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4022 else if (!Context.getTargetInfo().isTLSSupported()) 4023 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4024 else 4025 NewVD->setThreadSpecified(true); 4026 } 4027 4028 if (D.getDeclSpec().isModulePrivateSpecified()) { 4029 if (isExplicitSpecialization) 4030 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4031 << 2 4032 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4033 else if (NewVD->hasLocalStorage()) 4034 Diag(NewVD->getLocation(), diag::err_module_private_local) 4035 << 0 << NewVD->getDeclName() 4036 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4037 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4038 else 4039 NewVD->setModulePrivate(); 4040 } 4041 4042 // Handle attributes prior to checking for duplicates in MergeVarDecl 4043 ProcessDeclAttributes(S, NewVD, D); 4044 4045 // In auto-retain/release, infer strong retension for variables of 4046 // retainable type. 4047 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4048 NewVD->setInvalidDecl(); 4049 4050 // Handle GNU asm-label extension (encoded as an attribute). 4051 if (Expr *E = (Expr*)D.getAsmLabel()) { 4052 // The parser guarantees this is a string. 4053 StringLiteral *SE = cast<StringLiteral>(E); 4054 StringRef Label = SE->getString(); 4055 if (S->getFnParent() != 0) { 4056 switch (SC) { 4057 case SC_None: 4058 case SC_Auto: 4059 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4060 break; 4061 case SC_Register: 4062 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4063 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4064 break; 4065 case SC_Static: 4066 case SC_Extern: 4067 case SC_PrivateExtern: 4068 case SC_OpenCLWorkGroupLocal: 4069 break; 4070 } 4071 } 4072 4073 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4074 Context, Label)); 4075 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 4076 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 4077 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier()); 4078 if (I != ExtnameUndeclaredIdentifiers.end()) { 4079 NewVD->addAttr(I->second); 4080 ExtnameUndeclaredIdentifiers.erase(I); 4081 } 4082 } 4083 4084 // Diagnose shadowed variables before filtering for scope. 4085 if (!D.getCXXScopeSpec().isSet()) 4086 CheckShadow(S, NewVD, Previous); 4087 4088 // Don't consider existing declarations that are in a different 4089 // scope and are out-of-semantic-context declarations (if the new 4090 // declaration has linkage). 4091 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4092 isExplicitSpecialization); 4093 4094 if (!getLangOpts().CPlusPlus) { 4095 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4096 } else { 4097 // Merge the decl with the existing one if appropriate. 4098 if (!Previous.empty()) { 4099 if (Previous.isSingleResult() && 4100 isa<FieldDecl>(Previous.getFoundDecl()) && 4101 D.getCXXScopeSpec().isSet()) { 4102 // The user tried to define a non-static data member 4103 // out-of-line (C++ [dcl.meaning]p1). 4104 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4105 << D.getCXXScopeSpec().getRange(); 4106 Previous.clear(); 4107 NewVD->setInvalidDecl(); 4108 } 4109 } else if (D.getCXXScopeSpec().isSet()) { 4110 // No previous declaration in the qualifying scope. 4111 Diag(D.getIdentifierLoc(), diag::err_no_member) 4112 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4113 << D.getCXXScopeSpec().getRange(); 4114 NewVD->setInvalidDecl(); 4115 } 4116 4117 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4118 4119 // This is an explicit specialization of a static data member. Check it. 4120 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4121 CheckMemberSpecialization(NewVD, Previous)) 4122 NewVD->setInvalidDecl(); 4123 } 4124 4125 // attributes declared post-definition are currently ignored 4126 // FIXME: This should be handled in attribute merging, not 4127 // here. 4128 if (Previous.isSingleResult()) { 4129 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4130 if (Def && (Def = Def->getDefinition()) && 4131 Def != NewVD && D.hasAttributes()) { 4132 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4133 Diag(Def->getLocation(), diag::note_previous_definition); 4134 } 4135 } 4136 4137 // If this is a locally-scoped extern C variable, update the map of 4138 // such variables. 4139 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4140 !NewVD->isInvalidDecl()) 4141 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4142 4143 // If there's a #pragma GCC visibility in scope, and this isn't a class 4144 // member, set the visibility of this variable. 4145 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4146 AddPushedVisibilityAttribute(NewVD); 4147 4148 MarkUnusedFileScopedDecl(NewVD); 4149 4150 return NewVD; 4151} 4152 4153/// \brief Diagnose variable or built-in function shadowing. Implements 4154/// -Wshadow. 4155/// 4156/// This method is called whenever a VarDecl is added to a "useful" 4157/// scope. 4158/// 4159/// \param S the scope in which the shadowing name is being declared 4160/// \param R the lookup of the name 4161/// 4162void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4163 // Return if warning is ignored. 4164 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4165 DiagnosticsEngine::Ignored) 4166 return; 4167 4168 // Don't diagnose declarations at file scope. 4169 if (D->hasGlobalStorage()) 4170 return; 4171 4172 DeclContext *NewDC = D->getDeclContext(); 4173 4174 // Only diagnose if we're shadowing an unambiguous field or variable. 4175 if (R.getResultKind() != LookupResult::Found) 4176 return; 4177 4178 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4179 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4180 return; 4181 4182 // Fields are not shadowed by variables in C++ static methods. 4183 if (isa<FieldDecl>(ShadowedDecl)) 4184 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4185 if (MD->isStatic()) 4186 return; 4187 4188 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4189 if (shadowedVar->isExternC()) { 4190 // For shadowing external vars, make sure that we point to the global 4191 // declaration, not a locally scoped extern declaration. 4192 for (VarDecl::redecl_iterator 4193 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4194 I != E; ++I) 4195 if (I->isFileVarDecl()) { 4196 ShadowedDecl = *I; 4197 break; 4198 } 4199 } 4200 4201 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4202 4203 // Only warn about certain kinds of shadowing for class members. 4204 if (NewDC && NewDC->isRecord()) { 4205 // In particular, don't warn about shadowing non-class members. 4206 if (!OldDC->isRecord()) 4207 return; 4208 4209 // TODO: should we warn about static data members shadowing 4210 // static data members from base classes? 4211 4212 // TODO: don't diagnose for inaccessible shadowed members. 4213 // This is hard to do perfectly because we might friend the 4214 // shadowing context, but that's just a false negative. 4215 } 4216 4217 // Determine what kind of declaration we're shadowing. 4218 unsigned Kind; 4219 if (isa<RecordDecl>(OldDC)) { 4220 if (isa<FieldDecl>(ShadowedDecl)) 4221 Kind = 3; // field 4222 else 4223 Kind = 2; // static data member 4224 } else if (OldDC->isFileContext()) 4225 Kind = 1; // global 4226 else 4227 Kind = 0; // local 4228 4229 DeclarationName Name = R.getLookupName(); 4230 4231 // Emit warning and note. 4232 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4233 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4234} 4235 4236/// \brief Check -Wshadow without the advantage of a previous lookup. 4237void Sema::CheckShadow(Scope *S, VarDecl *D) { 4238 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4239 DiagnosticsEngine::Ignored) 4240 return; 4241 4242 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4243 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4244 LookupName(R, S); 4245 CheckShadow(S, D, R); 4246} 4247 4248/// \brief Perform semantic checking on a newly-created variable 4249/// declaration. 4250/// 4251/// This routine performs all of the type-checking required for a 4252/// variable declaration once it has been built. It is used both to 4253/// check variables after they have been parsed and their declarators 4254/// have been translated into a declaration, and to check variables 4255/// that have been instantiated from a template. 4256/// 4257/// Sets NewVD->isInvalidDecl() if an error was encountered. 4258/// 4259/// Returns true if the variable declaration is a redeclaration. 4260bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4261 LookupResult &Previous) { 4262 // If the decl is already known invalid, don't check it. 4263 if (NewVD->isInvalidDecl()) 4264 return false; 4265 4266 QualType T = NewVD->getType(); 4267 4268 if (T->isObjCObjectType()) { 4269 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4270 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4271 T = Context.getObjCObjectPointerType(T); 4272 NewVD->setType(T); 4273 } 4274 4275 // Emit an error if an address space was applied to decl with local storage. 4276 // This includes arrays of objects with address space qualifiers, but not 4277 // automatic variables that point to other address spaces. 4278 // ISO/IEC TR 18037 S5.1.2 4279 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4280 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4281 NewVD->setInvalidDecl(); 4282 return false; 4283 } 4284 4285 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4286 && !NewVD->hasAttr<BlocksAttr>()) { 4287 if (getLangOpts().getGC() != LangOptions::NonGC) 4288 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4289 else 4290 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4291 } 4292 4293 bool isVM = T->isVariablyModifiedType(); 4294 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4295 NewVD->hasAttr<BlocksAttr>()) 4296 getCurFunction()->setHasBranchProtectedScope(); 4297 4298 if ((isVM && NewVD->hasLinkage()) || 4299 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4300 bool SizeIsNegative; 4301 llvm::APSInt Oversized; 4302 QualType FixedTy = 4303 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4304 Oversized); 4305 4306 if (FixedTy.isNull() && T->isVariableArrayType()) { 4307 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4308 // FIXME: This won't give the correct result for 4309 // int a[10][n]; 4310 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4311 4312 if (NewVD->isFileVarDecl()) 4313 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4314 << SizeRange; 4315 else if (NewVD->getStorageClass() == SC_Static) 4316 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4317 << SizeRange; 4318 else 4319 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4320 << SizeRange; 4321 NewVD->setInvalidDecl(); 4322 return false; 4323 } 4324 4325 if (FixedTy.isNull()) { 4326 if (NewVD->isFileVarDecl()) 4327 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4328 else 4329 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4330 NewVD->setInvalidDecl(); 4331 return false; 4332 } 4333 4334 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4335 NewVD->setType(FixedTy); 4336 } 4337 4338 if (Previous.empty() && NewVD->isExternC()) { 4339 // Since we did not find anything by this name and we're declaring 4340 // an extern "C" variable, look for a non-visible extern "C" 4341 // declaration with the same name. 4342 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4343 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4344 if (Pos != LocallyScopedExternalDecls.end()) 4345 Previous.addDecl(Pos->second); 4346 } 4347 4348 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4349 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4350 << T; 4351 NewVD->setInvalidDecl(); 4352 return false; 4353 } 4354 4355 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4356 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4357 NewVD->setInvalidDecl(); 4358 return false; 4359 } 4360 4361 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4362 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4363 NewVD->setInvalidDecl(); 4364 return false; 4365 } 4366 4367 if (NewVD->isConstexpr() && !T->isDependentType() && 4368 RequireLiteralType(NewVD->getLocation(), T, 4369 PDiag(diag::err_constexpr_var_non_literal))) { 4370 NewVD->setInvalidDecl(); 4371 return false; 4372 } 4373 4374 if (!Previous.empty()) { 4375 MergeVarDecl(NewVD, Previous); 4376 return true; 4377 } 4378 return false; 4379} 4380 4381/// \brief Data used with FindOverriddenMethod 4382struct FindOverriddenMethodData { 4383 Sema *S; 4384 CXXMethodDecl *Method; 4385}; 4386 4387/// \brief Member lookup function that determines whether a given C++ 4388/// method overrides a method in a base class, to be used with 4389/// CXXRecordDecl::lookupInBases(). 4390static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4391 CXXBasePath &Path, 4392 void *UserData) { 4393 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4394 4395 FindOverriddenMethodData *Data 4396 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4397 4398 DeclarationName Name = Data->Method->getDeclName(); 4399 4400 // FIXME: Do we care about other names here too? 4401 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4402 // We really want to find the base class destructor here. 4403 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4404 CanQualType CT = Data->S->Context.getCanonicalType(T); 4405 4406 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4407 } 4408 4409 for (Path.Decls = BaseRecord->lookup(Name); 4410 Path.Decls.first != Path.Decls.second; 4411 ++Path.Decls.first) { 4412 NamedDecl *D = *Path.Decls.first; 4413 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4414 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4415 return true; 4416 } 4417 } 4418 4419 return false; 4420} 4421 4422/// AddOverriddenMethods - See if a method overrides any in the base classes, 4423/// and if so, check that it's a valid override and remember it. 4424bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4425 // Look for virtual methods in base classes that this method might override. 4426 CXXBasePaths Paths; 4427 FindOverriddenMethodData Data; 4428 Data.Method = MD; 4429 Data.S = this; 4430 bool AddedAny = false; 4431 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4432 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4433 E = Paths.found_decls_end(); I != E; ++I) { 4434 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4435 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4436 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4437 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4438 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4439 AddedAny = true; 4440 } 4441 } 4442 } 4443 } 4444 4445 return AddedAny; 4446} 4447 4448namespace { 4449 // Struct for holding all of the extra arguments needed by 4450 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4451 struct ActOnFDArgs { 4452 Scope *S; 4453 Declarator &D; 4454 MultiTemplateParamsArg TemplateParamLists; 4455 bool AddToScope; 4456 }; 4457} 4458 4459namespace { 4460 4461// Callback to only accept typo corrections that have a non-zero edit distance. 4462// Also only accept corrections that have the same parent decl. 4463class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4464 public: 4465 DifferentNameValidatorCCC(CXXRecordDecl *Parent) 4466 : ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {} 4467 4468 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4469 if (candidate.getEditDistance() == 0) 4470 return false; 4471 4472 if (CXXMethodDecl *MD = candidate.getCorrectionDeclAs<CXXMethodDecl>()) { 4473 CXXRecordDecl *Parent = MD->getParent(); 4474 return Parent && Parent->getCanonicalDecl() == ExpectedParent; 4475 } 4476 4477 return !ExpectedParent; 4478 } 4479 4480 private: 4481 CXXRecordDecl *ExpectedParent; 4482}; 4483 4484} 4485 4486/// \brief Generate diagnostics for an invalid function redeclaration. 4487/// 4488/// This routine handles generating the diagnostic messages for an invalid 4489/// function redeclaration, including finding possible similar declarations 4490/// or performing typo correction if there are no previous declarations with 4491/// the same name. 4492/// 4493/// Returns a NamedDecl iff typo correction was performed and substituting in 4494/// the new declaration name does not cause new errors. 4495static NamedDecl* DiagnoseInvalidRedeclaration( 4496 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4497 ActOnFDArgs &ExtraArgs) { 4498 NamedDecl *Result = NULL; 4499 DeclarationName Name = NewFD->getDeclName(); 4500 DeclContext *NewDC = NewFD->getDeclContext(); 4501 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4502 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4503 llvm::SmallVector<unsigned, 1> MismatchedParams; 4504 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4505 TypoCorrection Correction; 4506 bool isFriendDecl = (SemaRef.getLangOpts().CPlusPlus && 4507 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4508 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4509 : diag::err_member_def_does_not_match; 4510 4511 NewFD->setInvalidDecl(); 4512 SemaRef.LookupQualifiedName(Prev, NewDC); 4513 assert(!Prev.isAmbiguous() && 4514 "Cannot have an ambiguity in previous-declaration lookup"); 4515 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 4516 DifferentNameValidatorCCC Validator(MD ? MD->getParent() : 0); 4517 if (!Prev.empty()) { 4518 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4519 Func != FuncEnd; ++Func) { 4520 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4521 if (FD && 4522 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4523 // Add 1 to the index so that 0 can mean the mismatch didn't 4524 // involve a parameter 4525 unsigned ParamNum = 4526 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4527 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4528 } 4529 } 4530 // If the qualified name lookup yielded nothing, try typo correction 4531 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4532 Prev.getLookupKind(), 0, 0, 4533 Validator, NewDC))) { 4534 // Trap errors. 4535 Sema::SFINAETrap Trap(SemaRef); 4536 4537 // Set up everything for the call to ActOnFunctionDeclarator 4538 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4539 ExtraArgs.D.getIdentifierLoc()); 4540 Previous.clear(); 4541 Previous.setLookupName(Correction.getCorrection()); 4542 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4543 CDeclEnd = Correction.end(); 4544 CDecl != CDeclEnd; ++CDecl) { 4545 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4546 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4547 MismatchedParams)) { 4548 Previous.addDecl(FD); 4549 } 4550 } 4551 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4552 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4553 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4554 // eliminate the need for the parameter pack ExtraArgs. 4555 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4556 NewFD->getDeclContext(), 4557 NewFD->getTypeSourceInfo(), 4558 Previous, 4559 ExtraArgs.TemplateParamLists, 4560 ExtraArgs.AddToScope); 4561 if (Trap.hasErrorOccurred()) { 4562 // Pretend the typo correction never occurred 4563 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4564 ExtraArgs.D.getIdentifierLoc()); 4565 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4566 Previous.clear(); 4567 Previous.setLookupName(Name); 4568 Result = NULL; 4569 } else { 4570 for (LookupResult::iterator Func = Previous.begin(), 4571 FuncEnd = Previous.end(); 4572 Func != FuncEnd; ++Func) { 4573 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4574 NearMatches.push_back(std::make_pair(FD, 0)); 4575 } 4576 } 4577 if (NearMatches.empty()) { 4578 // Ignore the correction if it didn't yield any close FunctionDecl matches 4579 Correction = TypoCorrection(); 4580 } else { 4581 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4582 : diag::err_member_def_does_not_match_suggest; 4583 } 4584 } 4585 4586 if (Correction) 4587 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4588 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOpts()) 4589 << FixItHint::CreateReplacement( 4590 NewFD->getLocation(), 4591 Correction.getAsString(SemaRef.getLangOpts())); 4592 else 4593 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4594 << Name << NewDC << NewFD->getLocation(); 4595 4596 bool NewFDisConst = false; 4597 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4598 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4599 4600 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4601 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4602 NearMatch != NearMatchEnd; ++NearMatch) { 4603 FunctionDecl *FD = NearMatch->first; 4604 bool FDisConst = false; 4605 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4606 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4607 4608 if (unsigned Idx = NearMatch->second) { 4609 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4610 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4611 diag::note_member_def_close_param_match) 4612 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4613 } else if (Correction) { 4614 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4615 << Correction.getQuoted(SemaRef.getLangOpts()); 4616 } else if (FDisConst != NewFDisConst) { 4617 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4618 << NewFDisConst << FD->getSourceRange().getEnd(); 4619 } else 4620 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4621 } 4622 return Result; 4623} 4624 4625static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4626 Declarator &D) { 4627 switch (D.getDeclSpec().getStorageClassSpec()) { 4628 default: llvm_unreachable("Unknown storage class!"); 4629 case DeclSpec::SCS_auto: 4630 case DeclSpec::SCS_register: 4631 case DeclSpec::SCS_mutable: 4632 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4633 diag::err_typecheck_sclass_func); 4634 D.setInvalidType(); 4635 break; 4636 case DeclSpec::SCS_unspecified: break; 4637 case DeclSpec::SCS_extern: return SC_Extern; 4638 case DeclSpec::SCS_static: { 4639 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4640 // C99 6.7.1p5: 4641 // The declaration of an identifier for a function that has 4642 // block scope shall have no explicit storage-class specifier 4643 // other than extern 4644 // See also (C++ [dcl.stc]p4). 4645 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4646 diag::err_static_block_func); 4647 break; 4648 } else 4649 return SC_Static; 4650 } 4651 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4652 } 4653 4654 // No explicit storage class has already been returned 4655 return SC_None; 4656} 4657 4658static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4659 DeclContext *DC, QualType &R, 4660 TypeSourceInfo *TInfo, 4661 FunctionDecl::StorageClass SC, 4662 bool &IsVirtualOkay) { 4663 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4664 DeclarationName Name = NameInfo.getName(); 4665 4666 FunctionDecl *NewFD = 0; 4667 bool isInline = D.getDeclSpec().isInlineSpecified(); 4668 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4669 FunctionDecl::StorageClass SCAsWritten 4670 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4671 4672 if (!SemaRef.getLangOpts().CPlusPlus) { 4673 // Determine whether the function was written with a 4674 // prototype. This true when: 4675 // - there is a prototype in the declarator, or 4676 // - the type R of the function is some kind of typedef or other reference 4677 // to a type name (which eventually refers to a function type). 4678 bool HasPrototype = 4679 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4680 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4681 4682 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4683 D.getLocStart(), NameInfo, R, 4684 TInfo, SC, SCAsWritten, isInline, 4685 HasPrototype); 4686 if (D.isInvalidType()) 4687 NewFD->setInvalidDecl(); 4688 4689 // Set the lexical context. 4690 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4691 4692 return NewFD; 4693 } 4694 4695 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4696 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4697 4698 // Check that the return type is not an abstract class type. 4699 // For record types, this is done by the AbstractClassUsageDiagnoser once 4700 // the class has been completely parsed. 4701 if (!DC->isRecord() && 4702 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4703 R->getAs<FunctionType>()->getResultType(), 4704 diag::err_abstract_type_in_decl, 4705 SemaRef.AbstractReturnType)) 4706 D.setInvalidType(); 4707 4708 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4709 // This is a C++ constructor declaration. 4710 assert(DC->isRecord() && 4711 "Constructors can only be declared in a member context"); 4712 4713 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4714 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4715 D.getLocStart(), NameInfo, 4716 R, TInfo, isExplicit, isInline, 4717 /*isImplicitlyDeclared=*/false, 4718 isConstexpr); 4719 4720 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4721 // This is a C++ destructor declaration. 4722 if (DC->isRecord()) { 4723 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4724 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4725 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4726 SemaRef.Context, Record, 4727 D.getLocStart(), 4728 NameInfo, R, TInfo, isInline, 4729 /*isImplicitlyDeclared=*/false); 4730 4731 // If the class is complete, then we now create the implicit exception 4732 // specification. If the class is incomplete or dependent, we can't do 4733 // it yet. 4734 if (SemaRef.getLangOpts().CPlusPlus0x && !Record->isDependentType() && 4735 Record->getDefinition() && !Record->isBeingDefined() && 4736 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4737 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4738 } 4739 4740 IsVirtualOkay = true; 4741 return NewDD; 4742 4743 } else { 4744 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4745 D.setInvalidType(); 4746 4747 // Create a FunctionDecl to satisfy the function definition parsing 4748 // code path. 4749 return FunctionDecl::Create(SemaRef.Context, DC, 4750 D.getLocStart(), 4751 D.getIdentifierLoc(), Name, R, TInfo, 4752 SC, SCAsWritten, isInline, 4753 /*hasPrototype=*/true, isConstexpr); 4754 } 4755 4756 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4757 if (!DC->isRecord()) { 4758 SemaRef.Diag(D.getIdentifierLoc(), 4759 diag::err_conv_function_not_member); 4760 return 0; 4761 } 4762 4763 SemaRef.CheckConversionDeclarator(D, R, SC); 4764 IsVirtualOkay = true; 4765 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4766 D.getLocStart(), NameInfo, 4767 R, TInfo, isInline, isExplicit, 4768 isConstexpr, SourceLocation()); 4769 4770 } else if (DC->isRecord()) { 4771 // If the name of the function is the same as the name of the record, 4772 // then this must be an invalid constructor that has a return type. 4773 // (The parser checks for a return type and makes the declarator a 4774 // constructor if it has no return type). 4775 if (Name.getAsIdentifierInfo() && 4776 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4777 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4778 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4779 << SourceRange(D.getIdentifierLoc()); 4780 return 0; 4781 } 4782 4783 bool isStatic = SC == SC_Static; 4784 4785 // [class.free]p1: 4786 // Any allocation function for a class T is a static member 4787 // (even if not explicitly declared static). 4788 if (Name.getCXXOverloadedOperator() == OO_New || 4789 Name.getCXXOverloadedOperator() == OO_Array_New) 4790 isStatic = true; 4791 4792 // [class.free]p6 Any deallocation function for a class X is a static member 4793 // (even if not explicitly declared static). 4794 if (Name.getCXXOverloadedOperator() == OO_Delete || 4795 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4796 isStatic = true; 4797 4798 IsVirtualOkay = !isStatic; 4799 4800 // This is a C++ method declaration. 4801 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4802 D.getLocStart(), NameInfo, R, 4803 TInfo, isStatic, SCAsWritten, isInline, 4804 isConstexpr, SourceLocation()); 4805 4806 } else { 4807 // Determine whether the function was written with a 4808 // prototype. This true when: 4809 // - we're in C++ (where every function has a prototype), 4810 return FunctionDecl::Create(SemaRef.Context, DC, 4811 D.getLocStart(), 4812 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4813 true/*HasPrototype*/, isConstexpr); 4814 } 4815} 4816 4817NamedDecl* 4818Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4819 TypeSourceInfo *TInfo, LookupResult &Previous, 4820 MultiTemplateParamsArg TemplateParamLists, 4821 bool &AddToScope) { 4822 QualType R = TInfo->getType(); 4823 4824 assert(R.getTypePtr()->isFunctionType()); 4825 4826 // TODO: consider using NameInfo for diagnostic. 4827 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4828 DeclarationName Name = NameInfo.getName(); 4829 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4830 4831 if (D.getDeclSpec().isThreadSpecified()) 4832 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4833 4834 // Do not allow returning a objc interface by-value. 4835 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4836 Diag(D.getIdentifierLoc(), 4837 diag::err_object_cannot_be_passed_returned_by_value) << 0 4838 << R->getAs<FunctionType>()->getResultType() 4839 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4840 4841 QualType T = R->getAs<FunctionType>()->getResultType(); 4842 T = Context.getObjCObjectPointerType(T); 4843 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4844 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4845 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4846 FPT->getNumArgs(), EPI); 4847 } 4848 else if (isa<FunctionNoProtoType>(R)) 4849 R = Context.getFunctionNoProtoType(T); 4850 } 4851 4852 bool isFriend = false; 4853 FunctionTemplateDecl *FunctionTemplate = 0; 4854 bool isExplicitSpecialization = false; 4855 bool isFunctionTemplateSpecialization = false; 4856 bool isDependentClassScopeExplicitSpecialization = false; 4857 bool isVirtualOkay = false; 4858 4859 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4860 isVirtualOkay); 4861 if (!NewFD) return 0; 4862 4863 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4864 NewFD->setTopLevelDeclInObjCContainer(); 4865 4866 if (getLangOpts().CPlusPlus) { 4867 bool isInline = D.getDeclSpec().isInlineSpecified(); 4868 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4869 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4870 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4871 isFriend = D.getDeclSpec().isFriendSpecified(); 4872 if (isFriend && !isInline && D.isFunctionDefinition()) { 4873 // C++ [class.friend]p5 4874 // A function can be defined in a friend declaration of a 4875 // class . . . . Such a function is implicitly inline. 4876 NewFD->setImplicitlyInline(); 4877 } 4878 4879 SetNestedNameSpecifier(NewFD, D); 4880 isExplicitSpecialization = false; 4881 isFunctionTemplateSpecialization = false; 4882 if (D.isInvalidType()) 4883 NewFD->setInvalidDecl(); 4884 4885 // Set the lexical context. If the declarator has a C++ 4886 // scope specifier, or is the object of a friend declaration, the 4887 // lexical context will be different from the semantic context. 4888 NewFD->setLexicalDeclContext(CurContext); 4889 4890 // Match up the template parameter lists with the scope specifier, then 4891 // determine whether we have a template or a template specialization. 4892 bool Invalid = false; 4893 if (TemplateParameterList *TemplateParams 4894 = MatchTemplateParametersToScopeSpecifier( 4895 D.getDeclSpec().getLocStart(), 4896 D.getIdentifierLoc(), 4897 D.getCXXScopeSpec(), 4898 TemplateParamLists.get(), 4899 TemplateParamLists.size(), 4900 isFriend, 4901 isExplicitSpecialization, 4902 Invalid)) { 4903 if (TemplateParams->size() > 0) { 4904 // This is a function template 4905 4906 // Check that we can declare a template here. 4907 if (CheckTemplateDeclScope(S, TemplateParams)) 4908 return 0; 4909 4910 // A destructor cannot be a template. 4911 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4912 Diag(NewFD->getLocation(), diag::err_destructor_template); 4913 return 0; 4914 } 4915 4916 // If we're adding a template to a dependent context, we may need to 4917 // rebuilding some of the types used within the template parameter list, 4918 // now that we know what the current instantiation is. 4919 if (DC->isDependentContext()) { 4920 ContextRAII SavedContext(*this, DC); 4921 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4922 Invalid = true; 4923 } 4924 4925 4926 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4927 NewFD->getLocation(), 4928 Name, TemplateParams, 4929 NewFD); 4930 FunctionTemplate->setLexicalDeclContext(CurContext); 4931 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4932 4933 // For source fidelity, store the other template param lists. 4934 if (TemplateParamLists.size() > 1) { 4935 NewFD->setTemplateParameterListsInfo(Context, 4936 TemplateParamLists.size() - 1, 4937 TemplateParamLists.release()); 4938 } 4939 } else { 4940 // This is a function template specialization. 4941 isFunctionTemplateSpecialization = true; 4942 // For source fidelity, store all the template param lists. 4943 NewFD->setTemplateParameterListsInfo(Context, 4944 TemplateParamLists.size(), 4945 TemplateParamLists.release()); 4946 4947 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4948 if (isFriend) { 4949 // We want to remove the "template<>", found here. 4950 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4951 4952 // If we remove the template<> and the name is not a 4953 // template-id, we're actually silently creating a problem: 4954 // the friend declaration will refer to an untemplated decl, 4955 // and clearly the user wants a template specialization. So 4956 // we need to insert '<>' after the name. 4957 SourceLocation InsertLoc; 4958 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4959 InsertLoc = D.getName().getSourceRange().getEnd(); 4960 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4961 } 4962 4963 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4964 << Name << RemoveRange 4965 << FixItHint::CreateRemoval(RemoveRange) 4966 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4967 } 4968 } 4969 } 4970 else { 4971 // All template param lists were matched against the scope specifier: 4972 // this is NOT (an explicit specialization of) a template. 4973 if (TemplateParamLists.size() > 0) 4974 // For source fidelity, store all the template param lists. 4975 NewFD->setTemplateParameterListsInfo(Context, 4976 TemplateParamLists.size(), 4977 TemplateParamLists.release()); 4978 } 4979 4980 if (Invalid) { 4981 NewFD->setInvalidDecl(); 4982 if (FunctionTemplate) 4983 FunctionTemplate->setInvalidDecl(); 4984 } 4985 4986 // If we see "T var();" at block scope, where T is a class type, it is 4987 // probably an attempt to initialize a variable, not a function declaration. 4988 // We don't catch this case earlier, since there is no ambiguity here. 4989 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 4990 CurContext->isFunctionOrMethod() && 4991 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 4992 D.getDeclSpec().getStorageClassSpecAsWritten() 4993 == DeclSpec::SCS_unspecified) { 4994 QualType T = R->getAs<FunctionType>()->getResultType(); 4995 DeclaratorChunk &C = D.getTypeObject(0); 4996 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 4997 !C.Fun.TrailingReturnType && 4998 C.Fun.getExceptionSpecType() == EST_None) { 4999 SourceRange ParenRange(C.Loc, C.EndLoc); 5000 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 5001 5002 // If the declaration looks like: 5003 // T var1, 5004 // f(); 5005 // and name lookup finds a function named 'f', then the ',' was 5006 // probably intended to be a ';'. 5007 if (!D.isFirstDeclarator() && D.getIdentifier()) { 5008 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 5009 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 5010 if (Comma.getFileID() != Name.getFileID() || 5011 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 5012 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 5013 LookupOrdinaryName); 5014 if (LookupName(Result, S)) 5015 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 5016 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 5017 } 5018 } 5019 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 5020 // Empty parens mean value-initialization, and no parens mean default 5021 // initialization. These are equivalent if the default constructor is 5022 // user-provided, or if zero-initialization is a no-op. 5023 if (RD && RD->hasDefinition() && 5024 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 5025 Diag(C.Loc, diag::note_empty_parens_default_ctor) 5026 << FixItHint::CreateRemoval(ParenRange); 5027 else if (const char *Init = getFixItZeroInitializerForType(T)) 5028 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5029 << FixItHint::CreateReplacement(ParenRange, Init); 5030 else if (LangOpts.CPlusPlus0x) 5031 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5032 << FixItHint::CreateReplacement(ParenRange, "{}"); 5033 } 5034 } 5035 5036 // C++ [dcl.fct.spec]p5: 5037 // The virtual specifier shall only be used in declarations of 5038 // nonstatic class member functions that appear within a 5039 // member-specification of a class declaration; see 10.3. 5040 // 5041 if (isVirtual && !NewFD->isInvalidDecl()) { 5042 if (!isVirtualOkay) { 5043 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5044 diag::err_virtual_non_function); 5045 } else if (!CurContext->isRecord()) { 5046 // 'virtual' was specified outside of the class. 5047 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5048 diag::err_virtual_out_of_class) 5049 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5050 } else if (NewFD->getDescribedFunctionTemplate()) { 5051 // C++ [temp.mem]p3: 5052 // A member function template shall not be virtual. 5053 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5054 diag::err_virtual_member_function_template) 5055 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5056 } else { 5057 // Okay: Add virtual to the method. 5058 NewFD->setVirtualAsWritten(true); 5059 } 5060 } 5061 5062 // C++ [dcl.fct.spec]p3: 5063 // The inline specifier shall not appear on a block scope function 5064 // declaration. 5065 if (isInline && !NewFD->isInvalidDecl()) { 5066 if (CurContext->isFunctionOrMethod()) { 5067 // 'inline' is not allowed on block scope function declaration. 5068 Diag(D.getDeclSpec().getInlineSpecLoc(), 5069 diag::err_inline_declaration_block_scope) << Name 5070 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5071 } 5072 } 5073 5074 // C++ [dcl.fct.spec]p6: 5075 // The explicit specifier shall be used only in the declaration of a 5076 // constructor or conversion function within its class definition; 5077 // see 12.3.1 and 12.3.2. 5078 if (isExplicit && !NewFD->isInvalidDecl()) { 5079 if (!CurContext->isRecord()) { 5080 // 'explicit' was specified outside of the class. 5081 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5082 diag::err_explicit_out_of_class) 5083 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5084 } else if (!isa<CXXConstructorDecl>(NewFD) && 5085 !isa<CXXConversionDecl>(NewFD)) { 5086 // 'explicit' was specified on a function that wasn't a constructor 5087 // or conversion function. 5088 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5089 diag::err_explicit_non_ctor_or_conv_function) 5090 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5091 } 5092 } 5093 5094 if (isConstexpr) { 5095 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5096 // are implicitly inline. 5097 NewFD->setImplicitlyInline(); 5098 5099 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5100 // be either constructors or to return a literal type. Therefore, 5101 // destructors cannot be declared constexpr. 5102 if (isa<CXXDestructorDecl>(NewFD)) 5103 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5104 } 5105 5106 // If __module_private__ was specified, mark the function accordingly. 5107 if (D.getDeclSpec().isModulePrivateSpecified()) { 5108 if (isFunctionTemplateSpecialization) { 5109 SourceLocation ModulePrivateLoc 5110 = D.getDeclSpec().getModulePrivateSpecLoc(); 5111 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5112 << 0 5113 << FixItHint::CreateRemoval(ModulePrivateLoc); 5114 } else { 5115 NewFD->setModulePrivate(); 5116 if (FunctionTemplate) 5117 FunctionTemplate->setModulePrivate(); 5118 } 5119 } 5120 5121 if (isFriend) { 5122 // For now, claim that the objects have no previous declaration. 5123 if (FunctionTemplate) { 5124 FunctionTemplate->setObjectOfFriendDecl(false); 5125 FunctionTemplate->setAccess(AS_public); 5126 } 5127 NewFD->setObjectOfFriendDecl(false); 5128 NewFD->setAccess(AS_public); 5129 } 5130 5131 // If a function is defined as defaulted or deleted, mark it as such now. 5132 switch (D.getFunctionDefinitionKind()) { 5133 case FDK_Declaration: 5134 case FDK_Definition: 5135 break; 5136 5137 case FDK_Defaulted: 5138 NewFD->setDefaulted(); 5139 break; 5140 5141 case FDK_Deleted: 5142 NewFD->setDeletedAsWritten(); 5143 break; 5144 } 5145 5146 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5147 D.isFunctionDefinition()) { 5148 // C++ [class.mfct]p2: 5149 // A member function may be defined (8.4) in its class definition, in 5150 // which case it is an inline member function (7.1.2) 5151 NewFD->setImplicitlyInline(); 5152 } 5153 5154 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5155 !CurContext->isRecord()) { 5156 // C++ [class.static]p1: 5157 // A data or function member of a class may be declared static 5158 // in a class definition, in which case it is a static member of 5159 // the class. 5160 5161 // Complain about the 'static' specifier if it's on an out-of-line 5162 // member function definition. 5163 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5164 diag::err_static_out_of_line) 5165 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5166 } 5167 } 5168 5169 // Filter out previous declarations that don't match the scope. 5170 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5171 isExplicitSpecialization || 5172 isFunctionTemplateSpecialization); 5173 5174 // Handle GNU asm-label extension (encoded as an attribute). 5175 if (Expr *E = (Expr*) D.getAsmLabel()) { 5176 // The parser guarantees this is a string. 5177 StringLiteral *SE = cast<StringLiteral>(E); 5178 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5179 SE->getString())); 5180 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 5181 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 5182 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); 5183 if (I != ExtnameUndeclaredIdentifiers.end()) { 5184 NewFD->addAttr(I->second); 5185 ExtnameUndeclaredIdentifiers.erase(I); 5186 } 5187 } 5188 5189 // Copy the parameter declarations from the declarator D to the function 5190 // declaration NewFD, if they are available. First scavenge them into Params. 5191 SmallVector<ParmVarDecl*, 16> Params; 5192 if (D.isFunctionDeclarator()) { 5193 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5194 5195 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5196 // function that takes no arguments, not a function that takes a 5197 // single void argument. 5198 // We let through "const void" here because Sema::GetTypeForDeclarator 5199 // already checks for that case. 5200 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5201 FTI.ArgInfo[0].Param && 5202 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5203 // Empty arg list, don't push any params. 5204 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5205 5206 // In C++, the empty parameter-type-list must be spelled "void"; a 5207 // typedef of void is not permitted. 5208 if (getLangOpts().CPlusPlus && 5209 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5210 bool IsTypeAlias = false; 5211 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5212 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5213 else if (const TemplateSpecializationType *TST = 5214 Param->getType()->getAs<TemplateSpecializationType>()) 5215 IsTypeAlias = TST->isTypeAlias(); 5216 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5217 << IsTypeAlias; 5218 } 5219 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5220 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5221 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5222 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5223 Param->setDeclContext(NewFD); 5224 Params.push_back(Param); 5225 5226 if (Param->isInvalidDecl()) 5227 NewFD->setInvalidDecl(); 5228 } 5229 } 5230 5231 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5232 // When we're declaring a function with a typedef, typeof, etc as in the 5233 // following example, we'll need to synthesize (unnamed) 5234 // parameters for use in the declaration. 5235 // 5236 // @code 5237 // typedef void fn(int); 5238 // fn f; 5239 // @endcode 5240 5241 // Synthesize a parameter for each argument type. 5242 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5243 AE = FT->arg_type_end(); AI != AE; ++AI) { 5244 ParmVarDecl *Param = 5245 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5246 Param->setScopeInfo(0, Params.size()); 5247 Params.push_back(Param); 5248 } 5249 } else { 5250 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5251 "Should not need args for typedef of non-prototype fn"); 5252 } 5253 5254 // Finally, we know we have the right number of parameters, install them. 5255 NewFD->setParams(Params); 5256 5257 // Find all anonymous symbols defined during the declaration of this function 5258 // and add to NewFD. This lets us track decls such 'enum Y' in: 5259 // 5260 // void f(enum Y {AA} x) {} 5261 // 5262 // which would otherwise incorrectly end up in the translation unit scope. 5263 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope); 5264 DeclsInPrototypeScope.clear(); 5265 5266 // Process the non-inheritable attributes on this declaration. 5267 ProcessDeclAttributes(S, NewFD, D, 5268 /*NonInheritable=*/true, /*Inheritable=*/false); 5269 5270 // Functions returning a variably modified type violate C99 6.7.5.2p2 5271 // because all functions have linkage. 5272 if (!NewFD->isInvalidDecl() && 5273 NewFD->getResultType()->isVariablyModifiedType()) { 5274 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5275 NewFD->setInvalidDecl(); 5276 } 5277 5278 if (!getLangOpts().CPlusPlus) { 5279 // Perform semantic checking on the function declaration. 5280 bool isExplicitSpecialization=false; 5281 if (!NewFD->isInvalidDecl()) { 5282 if (NewFD->isMain()) 5283 CheckMain(NewFD, D.getDeclSpec()); 5284 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5285 isExplicitSpecialization)); 5286 } 5287 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5288 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5289 "previous declaration set still overloaded"); 5290 } else { 5291 // If the declarator is a template-id, translate the parser's template 5292 // argument list into our AST format. 5293 bool HasExplicitTemplateArgs = false; 5294 TemplateArgumentListInfo TemplateArgs; 5295 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5296 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5297 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5298 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5299 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5300 TemplateId->getTemplateArgs(), 5301 TemplateId->NumArgs); 5302 translateTemplateArguments(TemplateArgsPtr, 5303 TemplateArgs); 5304 TemplateArgsPtr.release(); 5305 5306 HasExplicitTemplateArgs = true; 5307 5308 if (NewFD->isInvalidDecl()) { 5309 HasExplicitTemplateArgs = false; 5310 } else if (FunctionTemplate) { 5311 // Function template with explicit template arguments. 5312 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5313 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5314 5315 HasExplicitTemplateArgs = false; 5316 } else if (!isFunctionTemplateSpecialization && 5317 !D.getDeclSpec().isFriendSpecified()) { 5318 // We have encountered something that the user meant to be a 5319 // specialization (because it has explicitly-specified template 5320 // arguments) but that was not introduced with a "template<>" (or had 5321 // too few of them). 5322 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5323 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5324 << FixItHint::CreateInsertion( 5325 D.getDeclSpec().getLocStart(), 5326 "template<> "); 5327 isFunctionTemplateSpecialization = true; 5328 } else { 5329 // "friend void foo<>(int);" is an implicit specialization decl. 5330 isFunctionTemplateSpecialization = true; 5331 } 5332 } else if (isFriend && isFunctionTemplateSpecialization) { 5333 // This combination is only possible in a recovery case; the user 5334 // wrote something like: 5335 // template <> friend void foo(int); 5336 // which we're recovering from as if the user had written: 5337 // friend void foo<>(int); 5338 // Go ahead and fake up a template id. 5339 HasExplicitTemplateArgs = true; 5340 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5341 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5342 } 5343 5344 // If it's a friend (and only if it's a friend), it's possible 5345 // that either the specialized function type or the specialized 5346 // template is dependent, and therefore matching will fail. In 5347 // this case, don't check the specialization yet. 5348 bool InstantiationDependent = false; 5349 if (isFunctionTemplateSpecialization && isFriend && 5350 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5351 TemplateSpecializationType::anyDependentTemplateArguments( 5352 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5353 InstantiationDependent))) { 5354 assert(HasExplicitTemplateArgs && 5355 "friend function specialization without template args"); 5356 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5357 Previous)) 5358 NewFD->setInvalidDecl(); 5359 } else if (isFunctionTemplateSpecialization) { 5360 if (CurContext->isDependentContext() && CurContext->isRecord() 5361 && !isFriend) { 5362 isDependentClassScopeExplicitSpecialization = true; 5363 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ? 5364 diag::ext_function_specialization_in_class : 5365 diag::err_function_specialization_in_class) 5366 << NewFD->getDeclName(); 5367 } else if (CheckFunctionTemplateSpecialization(NewFD, 5368 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5369 Previous)) 5370 NewFD->setInvalidDecl(); 5371 5372 // C++ [dcl.stc]p1: 5373 // A storage-class-specifier shall not be specified in an explicit 5374 // specialization (14.7.3) 5375 if (SC != SC_None) { 5376 if (SC != NewFD->getStorageClass()) 5377 Diag(NewFD->getLocation(), 5378 diag::err_explicit_specialization_inconsistent_storage_class) 5379 << SC 5380 << FixItHint::CreateRemoval( 5381 D.getDeclSpec().getStorageClassSpecLoc()); 5382 5383 else 5384 Diag(NewFD->getLocation(), 5385 diag::ext_explicit_specialization_storage_class) 5386 << FixItHint::CreateRemoval( 5387 D.getDeclSpec().getStorageClassSpecLoc()); 5388 } 5389 5390 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5391 if (CheckMemberSpecialization(NewFD, Previous)) 5392 NewFD->setInvalidDecl(); 5393 } 5394 5395 // Perform semantic checking on the function declaration. 5396 if (!isDependentClassScopeExplicitSpecialization) { 5397 if (NewFD->isInvalidDecl()) { 5398 // If this is a class member, mark the class invalid immediately. 5399 // This avoids some consistency errors later. 5400 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5401 methodDecl->getParent()->setInvalidDecl(); 5402 } else { 5403 if (NewFD->isMain()) 5404 CheckMain(NewFD, D.getDeclSpec()); 5405 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5406 isExplicitSpecialization)); 5407 } 5408 } 5409 5410 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5411 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5412 "previous declaration set still overloaded"); 5413 5414 NamedDecl *PrincipalDecl = (FunctionTemplate 5415 ? cast<NamedDecl>(FunctionTemplate) 5416 : NewFD); 5417 5418 if (isFriend && D.isRedeclaration()) { 5419 AccessSpecifier Access = AS_public; 5420 if (!NewFD->isInvalidDecl()) 5421 Access = NewFD->getPreviousDecl()->getAccess(); 5422 5423 NewFD->setAccess(Access); 5424 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5425 5426 PrincipalDecl->setObjectOfFriendDecl(true); 5427 } 5428 5429 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5430 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5431 PrincipalDecl->setNonMemberOperator(); 5432 5433 // If we have a function template, check the template parameter 5434 // list. This will check and merge default template arguments. 5435 if (FunctionTemplate) { 5436 FunctionTemplateDecl *PrevTemplate = 5437 FunctionTemplate->getPreviousDecl(); 5438 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5439 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5440 D.getDeclSpec().isFriendSpecified() 5441 ? (D.isFunctionDefinition() 5442 ? TPC_FriendFunctionTemplateDefinition 5443 : TPC_FriendFunctionTemplate) 5444 : (D.getCXXScopeSpec().isSet() && 5445 DC && DC->isRecord() && 5446 DC->isDependentContext()) 5447 ? TPC_ClassTemplateMember 5448 : TPC_FunctionTemplate); 5449 } 5450 5451 if (NewFD->isInvalidDecl()) { 5452 // Ignore all the rest of this. 5453 } else if (!D.isRedeclaration()) { 5454 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5455 AddToScope }; 5456 // Fake up an access specifier if it's supposed to be a class member. 5457 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5458 NewFD->setAccess(AS_public); 5459 5460 // Qualified decls generally require a previous declaration. 5461 if (D.getCXXScopeSpec().isSet()) { 5462 // ...with the major exception of templated-scope or 5463 // dependent-scope friend declarations. 5464 5465 // TODO: we currently also suppress this check in dependent 5466 // contexts because (1) the parameter depth will be off when 5467 // matching friend templates and (2) we might actually be 5468 // selecting a friend based on a dependent factor. But there 5469 // are situations where these conditions don't apply and we 5470 // can actually do this check immediately. 5471 if (isFriend && 5472 (TemplateParamLists.size() || 5473 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5474 CurContext->isDependentContext())) { 5475 // ignore these 5476 } else { 5477 // The user tried to provide an out-of-line definition for a 5478 // function that is a member of a class or namespace, but there 5479 // was no such member function declared (C++ [class.mfct]p2, 5480 // C++ [namespace.memdef]p2). For example: 5481 // 5482 // class X { 5483 // void f() const; 5484 // }; 5485 // 5486 // void X::f() { } // ill-formed 5487 // 5488 // Complain about this problem, and attempt to suggest close 5489 // matches (e.g., those that differ only in cv-qualifiers and 5490 // whether the parameter types are references). 5491 5492 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5493 NewFD, 5494 ExtraArgs)) { 5495 AddToScope = ExtraArgs.AddToScope; 5496 return Result; 5497 } 5498 } 5499 5500 // Unqualified local friend declarations are required to resolve 5501 // to something. 5502 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5503 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5504 NewFD, 5505 ExtraArgs)) { 5506 AddToScope = ExtraArgs.AddToScope; 5507 return Result; 5508 } 5509 } 5510 5511 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5512 !isFriend && !isFunctionTemplateSpecialization && 5513 !isExplicitSpecialization) { 5514 // An out-of-line member function declaration must also be a 5515 // definition (C++ [dcl.meaning]p1). 5516 // Note that this is not the case for explicit specializations of 5517 // function templates or member functions of class templates, per 5518 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5519 // extension for compatibility with old SWIG code which likes to 5520 // generate them. 5521 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5522 << D.getCXXScopeSpec().getRange(); 5523 } 5524 } 5525 5526 5527 // Handle attributes. We need to have merged decls when handling attributes 5528 // (for example to check for conflicts, etc). 5529 // FIXME: This needs to happen before we merge declarations. Then, 5530 // let attribute merging cope with attribute conflicts. 5531 ProcessDeclAttributes(S, NewFD, D, 5532 /*NonInheritable=*/false, /*Inheritable=*/true); 5533 5534 // attributes declared post-definition are currently ignored 5535 // FIXME: This should happen during attribute merging 5536 if (D.isRedeclaration() && Previous.isSingleResult()) { 5537 const FunctionDecl *Def; 5538 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5539 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5540 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5541 Diag(Def->getLocation(), diag::note_previous_definition); 5542 } 5543 } 5544 5545 AddKnownFunctionAttributes(NewFD); 5546 5547 if (NewFD->hasAttr<OverloadableAttr>() && 5548 !NewFD->getType()->getAs<FunctionProtoType>()) { 5549 Diag(NewFD->getLocation(), 5550 diag::err_attribute_overloadable_no_prototype) 5551 << NewFD; 5552 5553 // Turn this into a variadic function with no parameters. 5554 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5555 FunctionProtoType::ExtProtoInfo EPI; 5556 EPI.Variadic = true; 5557 EPI.ExtInfo = FT->getExtInfo(); 5558 5559 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5560 NewFD->setType(R); 5561 } 5562 5563 // If there's a #pragma GCC visibility in scope, and this isn't a class 5564 // member, set the visibility of this function. 5565 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5566 AddPushedVisibilityAttribute(NewFD); 5567 5568 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5569 // marking the function. 5570 AddCFAuditedAttribute(NewFD); 5571 5572 // If this is a locally-scoped extern C function, update the 5573 // map of such names. 5574 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5575 && !NewFD->isInvalidDecl()) 5576 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5577 5578 // Set this FunctionDecl's range up to the right paren. 5579 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5580 5581 if (getLangOpts().CPlusPlus) { 5582 if (FunctionTemplate) { 5583 if (NewFD->isInvalidDecl()) 5584 FunctionTemplate->setInvalidDecl(); 5585 return FunctionTemplate; 5586 } 5587 } 5588 5589 MarkUnusedFileScopedDecl(NewFD); 5590 5591 if (getLangOpts().CUDA) 5592 if (IdentifierInfo *II = NewFD->getIdentifier()) 5593 if (!NewFD->isInvalidDecl() && 5594 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5595 if (II->isStr("cudaConfigureCall")) { 5596 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5597 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5598 5599 Context.setcudaConfigureCallDecl(NewFD); 5600 } 5601 } 5602 5603 // Here we have an function template explicit specialization at class scope. 5604 // The actually specialization will be postponed to template instatiation 5605 // time via the ClassScopeFunctionSpecializationDecl node. 5606 if (isDependentClassScopeExplicitSpecialization) { 5607 ClassScopeFunctionSpecializationDecl *NewSpec = 5608 ClassScopeFunctionSpecializationDecl::Create( 5609 Context, CurContext, SourceLocation(), 5610 cast<CXXMethodDecl>(NewFD)); 5611 CurContext->addDecl(NewSpec); 5612 AddToScope = false; 5613 } 5614 5615 return NewFD; 5616} 5617 5618/// \brief Perform semantic checking of a new function declaration. 5619/// 5620/// Performs semantic analysis of the new function declaration 5621/// NewFD. This routine performs all semantic checking that does not 5622/// require the actual declarator involved in the declaration, and is 5623/// used both for the declaration of functions as they are parsed 5624/// (called via ActOnDeclarator) and for the declaration of functions 5625/// that have been instantiated via C++ template instantiation (called 5626/// via InstantiateDecl). 5627/// 5628/// \param IsExplicitSpecialiation whether this new function declaration is 5629/// an explicit specialization of the previous declaration. 5630/// 5631/// This sets NewFD->isInvalidDecl() to true if there was an error. 5632/// 5633/// Returns true if the function declaration is a redeclaration. 5634bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5635 LookupResult &Previous, 5636 bool IsExplicitSpecialization) { 5637 assert(!NewFD->getResultType()->isVariablyModifiedType() 5638 && "Variably modified return types are not handled here"); 5639 5640 // Check for a previous declaration of this name. 5641 if (Previous.empty() && NewFD->isExternC()) { 5642 // Since we did not find anything by this name and we're declaring 5643 // an extern "C" function, look for a non-visible extern "C" 5644 // declaration with the same name. 5645 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5646 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5647 if (Pos != LocallyScopedExternalDecls.end()) 5648 Previous.addDecl(Pos->second); 5649 } 5650 5651 bool Redeclaration = false; 5652 5653 // Merge or overload the declaration with an existing declaration of 5654 // the same name, if appropriate. 5655 if (!Previous.empty()) { 5656 // Determine whether NewFD is an overload of PrevDecl or 5657 // a declaration that requires merging. If it's an overload, 5658 // there's no more work to do here; we'll just add the new 5659 // function to the scope. 5660 5661 NamedDecl *OldDecl = 0; 5662 if (!AllowOverloadingOfFunction(Previous, Context)) { 5663 Redeclaration = true; 5664 OldDecl = Previous.getFoundDecl(); 5665 } else { 5666 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5667 /*NewIsUsingDecl*/ false)) { 5668 case Ovl_Match: 5669 Redeclaration = true; 5670 break; 5671 5672 case Ovl_NonFunction: 5673 Redeclaration = true; 5674 break; 5675 5676 case Ovl_Overload: 5677 Redeclaration = false; 5678 break; 5679 } 5680 5681 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5682 // If a function name is overloadable in C, then every function 5683 // with that name must be marked "overloadable". 5684 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5685 << Redeclaration << NewFD; 5686 NamedDecl *OverloadedDecl = 0; 5687 if (Redeclaration) 5688 OverloadedDecl = OldDecl; 5689 else if (!Previous.empty()) 5690 OverloadedDecl = Previous.getRepresentativeDecl(); 5691 if (OverloadedDecl) 5692 Diag(OverloadedDecl->getLocation(), 5693 diag::note_attribute_overloadable_prev_overload); 5694 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5695 Context)); 5696 } 5697 } 5698 5699 if (Redeclaration) { 5700 // NewFD and OldDecl represent declarations that need to be 5701 // merged. 5702 if (MergeFunctionDecl(NewFD, OldDecl, S)) { 5703 NewFD->setInvalidDecl(); 5704 return Redeclaration; 5705 } 5706 5707 Previous.clear(); 5708 Previous.addDecl(OldDecl); 5709 5710 if (FunctionTemplateDecl *OldTemplateDecl 5711 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5712 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5713 FunctionTemplateDecl *NewTemplateDecl 5714 = NewFD->getDescribedFunctionTemplate(); 5715 assert(NewTemplateDecl && "Template/non-template mismatch"); 5716 if (CXXMethodDecl *Method 5717 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5718 Method->setAccess(OldTemplateDecl->getAccess()); 5719 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5720 } 5721 5722 // If this is an explicit specialization of a member that is a function 5723 // template, mark it as a member specialization. 5724 if (IsExplicitSpecialization && 5725 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5726 NewTemplateDecl->setMemberSpecialization(); 5727 assert(OldTemplateDecl->isMemberSpecialization()); 5728 } 5729 5730 } else { 5731 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5732 NewFD->setAccess(OldDecl->getAccess()); 5733 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5734 } 5735 } 5736 } 5737 5738 // Semantic checking for this function declaration (in isolation). 5739 if (getLangOpts().CPlusPlus) { 5740 // C++-specific checks. 5741 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5742 CheckConstructor(Constructor); 5743 } else if (CXXDestructorDecl *Destructor = 5744 dyn_cast<CXXDestructorDecl>(NewFD)) { 5745 CXXRecordDecl *Record = Destructor->getParent(); 5746 QualType ClassType = Context.getTypeDeclType(Record); 5747 5748 // FIXME: Shouldn't we be able to perform this check even when the class 5749 // type is dependent? Both gcc and edg can handle that. 5750 if (!ClassType->isDependentType()) { 5751 DeclarationName Name 5752 = Context.DeclarationNames.getCXXDestructorName( 5753 Context.getCanonicalType(ClassType)); 5754 if (NewFD->getDeclName() != Name) { 5755 Diag(NewFD->getLocation(), diag::err_destructor_name); 5756 NewFD->setInvalidDecl(); 5757 return Redeclaration; 5758 } 5759 } 5760 } else if (CXXConversionDecl *Conversion 5761 = dyn_cast<CXXConversionDecl>(NewFD)) { 5762 ActOnConversionDeclarator(Conversion); 5763 } 5764 5765 // Find any virtual functions that this function overrides. 5766 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5767 if (!Method->isFunctionTemplateSpecialization() && 5768 !Method->getDescribedFunctionTemplate()) { 5769 if (AddOverriddenMethods(Method->getParent(), Method)) { 5770 // If the function was marked as "static", we have a problem. 5771 if (NewFD->getStorageClass() == SC_Static) { 5772 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5773 << NewFD->getDeclName(); 5774 for (CXXMethodDecl::method_iterator 5775 Overridden = Method->begin_overridden_methods(), 5776 OverriddenEnd = Method->end_overridden_methods(); 5777 Overridden != OverriddenEnd; 5778 ++Overridden) { 5779 Diag((*Overridden)->getLocation(), 5780 diag::note_overridden_virtual_function); 5781 } 5782 } 5783 } 5784 } 5785 } 5786 5787 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5788 if (NewFD->isOverloadedOperator() && 5789 CheckOverloadedOperatorDeclaration(NewFD)) { 5790 NewFD->setInvalidDecl(); 5791 return Redeclaration; 5792 } 5793 5794 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5795 if (NewFD->getLiteralIdentifier() && 5796 CheckLiteralOperatorDeclaration(NewFD)) { 5797 NewFD->setInvalidDecl(); 5798 return Redeclaration; 5799 } 5800 5801 // In C++, check default arguments now that we have merged decls. Unless 5802 // the lexical context is the class, because in this case this is done 5803 // during delayed parsing anyway. 5804 if (!CurContext->isRecord()) 5805 CheckCXXDefaultArguments(NewFD); 5806 5807 // If this function declares a builtin function, check the type of this 5808 // declaration against the expected type for the builtin. 5809 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5810 ASTContext::GetBuiltinTypeError Error; 5811 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5812 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5813 // The type of this function differs from the type of the builtin, 5814 // so forget about the builtin entirely. 5815 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5816 } 5817 } 5818 5819 // If this function is declared as being extern "C", then check to see if 5820 // the function returns a UDT (class, struct, or union type) that is not C 5821 // compatible, and if it does, warn the user. 5822 if (NewFD->isExternC()) { 5823 QualType R = NewFD->getResultType(); 5824 if (!R.isPODType(Context) && 5825 !R->isVoidType()) 5826 Diag( NewFD->getLocation(), diag::warn_return_value_udt ) 5827 << NewFD << R; 5828 } 5829 } 5830 return Redeclaration; 5831} 5832 5833void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5834 // C++11 [basic.start.main]p3: A program that declares main to be inline, 5835 // static or constexpr is ill-formed. 5836 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5837 // shall not appear in a declaration of main. 5838 // static main is not an error under C99, but we should warn about it. 5839 if (FD->getStorageClass() == SC_Static) 5840 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus 5841 ? diag::err_static_main : diag::warn_static_main) 5842 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5843 if (FD->isInlineSpecified()) 5844 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5845 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5846 if (FD->isConstexpr()) { 5847 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 5848 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 5849 FD->setConstexpr(false); 5850 } 5851 5852 QualType T = FD->getType(); 5853 assert(T->isFunctionType() && "function decl is not of function type"); 5854 const FunctionType* FT = T->castAs<FunctionType>(); 5855 5856 // All the standards say that main() should should return 'int'. 5857 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5858 // In C and C++, main magically returns 0 if you fall off the end; 5859 // set the flag which tells us that. 5860 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5861 FD->setHasImplicitReturnZero(true); 5862 5863 // In C with GNU extensions we allow main() to have non-integer return 5864 // type, but we should warn about the extension, and we disable the 5865 // implicit-return-zero rule. 5866 } else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) { 5867 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); 5868 5869 // Otherwise, this is just a flat-out error. 5870 } else { 5871 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5872 FD->setInvalidDecl(true); 5873 } 5874 5875 // Treat protoless main() as nullary. 5876 if (isa<FunctionNoProtoType>(FT)) return; 5877 5878 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5879 unsigned nparams = FTP->getNumArgs(); 5880 assert(FD->getNumParams() == nparams); 5881 5882 bool HasExtraParameters = (nparams > 3); 5883 5884 // Darwin passes an undocumented fourth argument of type char**. If 5885 // other platforms start sprouting these, the logic below will start 5886 // getting shifty. 5887 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5888 HasExtraParameters = false; 5889 5890 if (HasExtraParameters) { 5891 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5892 FD->setInvalidDecl(true); 5893 nparams = 3; 5894 } 5895 5896 // FIXME: a lot of the following diagnostics would be improved 5897 // if we had some location information about types. 5898 5899 QualType CharPP = 5900 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5901 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5902 5903 for (unsigned i = 0; i < nparams; ++i) { 5904 QualType AT = FTP->getArgType(i); 5905 5906 bool mismatch = true; 5907 5908 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5909 mismatch = false; 5910 else if (Expected[i] == CharPP) { 5911 // As an extension, the following forms are okay: 5912 // char const ** 5913 // char const * const * 5914 // char * const * 5915 5916 QualifierCollector qs; 5917 const PointerType* PT; 5918 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5919 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5920 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5921 qs.removeConst(); 5922 mismatch = !qs.empty(); 5923 } 5924 } 5925 5926 if (mismatch) { 5927 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5928 // TODO: suggest replacing given type with expected type 5929 FD->setInvalidDecl(true); 5930 } 5931 } 5932 5933 if (nparams == 1 && !FD->isInvalidDecl()) { 5934 Diag(FD->getLocation(), diag::warn_main_one_arg); 5935 } 5936 5937 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5938 Diag(FD->getLocation(), diag::err_main_template_decl); 5939 FD->setInvalidDecl(); 5940 } 5941} 5942 5943bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5944 // FIXME: Need strict checking. In C89, we need to check for 5945 // any assignment, increment, decrement, function-calls, or 5946 // commas outside of a sizeof. In C99, it's the same list, 5947 // except that the aforementioned are allowed in unevaluated 5948 // expressions. Everything else falls under the 5949 // "may accept other forms of constant expressions" exception. 5950 // (We never end up here for C++, so the constant expression 5951 // rules there don't matter.) 5952 if (Init->isConstantInitializer(Context, false)) 5953 return false; 5954 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5955 << Init->getSourceRange(); 5956 return true; 5957} 5958 5959namespace { 5960 // Visits an initialization expression to see if OrigDecl is evaluated in 5961 // its own initialization and throws a warning if it does. 5962 class SelfReferenceChecker 5963 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5964 Sema &S; 5965 Decl *OrigDecl; 5966 bool isRecordType; 5967 bool isPODType; 5968 5969 public: 5970 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5971 5972 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5973 S(S), OrigDecl(OrigDecl) { 5974 isPODType = false; 5975 isRecordType = false; 5976 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5977 isPODType = VD->getType().isPODType(S.Context); 5978 isRecordType = VD->getType()->isRecordType(); 5979 } 5980 } 5981 5982 void VisitExpr(Expr *E) { 5983 if (isa<ObjCMessageExpr>(*E)) return; 5984 if (isRecordType) { 5985 Expr *expr = E; 5986 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5987 ValueDecl *VD = ME->getMemberDecl(); 5988 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5989 expr = ME->getBase(); 5990 } 5991 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5992 HandleDeclRefExpr(DRE); 5993 return; 5994 } 5995 } 5996 Inherited::VisitExpr(E); 5997 } 5998 5999 void VisitMemberExpr(MemberExpr *E) { 6000 if (E->getType()->canDecayToPointerType()) return; 6001 ValueDecl *VD = E->getMemberDecl(); 6002 if (isa<FieldDecl>(VD) || isa<CXXMethodDecl>(VD)) 6003 if (DeclRefExpr *DRE 6004 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 6005 HandleDeclRefExpr(DRE); 6006 return; 6007 } 6008 Inherited::VisitMemberExpr(E); 6009 } 6010 6011 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 6012 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 6013 (isRecordType && E->getCastKind() == CK_NoOp)) { 6014 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 6015 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 6016 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 6017 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 6018 HandleDeclRefExpr(DRE); 6019 return; 6020 } 6021 } 6022 Inherited::VisitImplicitCastExpr(E); 6023 } 6024 6025 void VisitUnaryOperator(UnaryOperator *E) { 6026 // For POD record types, addresses of its own members are well-defined. 6027 if (isRecordType && isPODType) return; 6028 Inherited::VisitUnaryOperator(E); 6029 } 6030 6031 void HandleDeclRefExpr(DeclRefExpr *DRE) { 6032 Decl* ReferenceDecl = DRE->getDecl(); 6033 if (OrigDecl != ReferenceDecl) return; 6034 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 6035 Sema::NotForRedeclaration); 6036 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 6037 S.PDiag(diag::warn_uninit_self_reference_in_init) 6038 << Result.getLookupName() 6039 << OrigDecl->getLocation() 6040 << DRE->getSourceRange()); 6041 } 6042 }; 6043} 6044 6045/// CheckSelfReference - Warns if OrigDecl is used in expression E. 6046void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 6047 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 6048} 6049 6050/// AddInitializerToDecl - Adds the initializer Init to the 6051/// declaration dcl. If DirectInit is true, this is C++ direct 6052/// initialization rather than copy initialization. 6053void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 6054 bool DirectInit, bool TypeMayContainAuto) { 6055 // If there is no declaration, there was an error parsing it. Just ignore 6056 // the initializer. 6057 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 6058 return; 6059 6060 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6061 // With declarators parsed the way they are, the parser cannot 6062 // distinguish between a normal initializer and a pure-specifier. 6063 // Thus this grotesque test. 6064 IntegerLiteral *IL; 6065 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6066 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6067 CheckPureMethod(Method, Init->getSourceRange()); 6068 else { 6069 Diag(Method->getLocation(), diag::err_member_function_initialization) 6070 << Method->getDeclName() << Init->getSourceRange(); 6071 Method->setInvalidDecl(); 6072 } 6073 return; 6074 } 6075 6076 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6077 if (!VDecl) { 6078 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6079 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6080 RealDecl->setInvalidDecl(); 6081 return; 6082 } 6083 6084 // Check for self-references within variable initializers. 6085 // Variables declared within a function/method body are handled 6086 // by a dataflow analysis. 6087 if (!VDecl->hasLocalStorage() && !VDecl->isStaticLocal()) 6088 CheckSelfReference(RealDecl, Init); 6089 6090 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); 6091 6092 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6093 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6094 Expr *DeduceInit = Init; 6095 // Initializer could be a C++ direct-initializer. Deduction only works if it 6096 // contains exactly one expression. 6097 if (CXXDirectInit) { 6098 if (CXXDirectInit->getNumExprs() == 0) { 6099 // It isn't possible to write this directly, but it is possible to 6100 // end up in this situation with "auto x(some_pack...);" 6101 Diag(CXXDirectInit->getLocStart(), 6102 diag::err_auto_var_init_no_expression) 6103 << VDecl->getDeclName() << VDecl->getType() 6104 << VDecl->getSourceRange(); 6105 RealDecl->setInvalidDecl(); 6106 return; 6107 } else if (CXXDirectInit->getNumExprs() > 1) { 6108 Diag(CXXDirectInit->getExpr(1)->getLocStart(), 6109 diag::err_auto_var_init_multiple_expressions) 6110 << VDecl->getDeclName() << VDecl->getType() 6111 << VDecl->getSourceRange(); 6112 RealDecl->setInvalidDecl(); 6113 return; 6114 } else { 6115 DeduceInit = CXXDirectInit->getExpr(0); 6116 } 6117 } 6118 TypeSourceInfo *DeducedType = 0; 6119 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) == 6120 DAR_Failed) 6121 DiagnoseAutoDeductionFailure(VDecl, DeduceInit); 6122 if (!DeducedType) { 6123 RealDecl->setInvalidDecl(); 6124 return; 6125 } 6126 VDecl->setTypeSourceInfo(DeducedType); 6127 VDecl->setType(DeducedType->getType()); 6128 VDecl->ClearLinkageCache(); 6129 6130 // In ARC, infer lifetime. 6131 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6132 VDecl->setInvalidDecl(); 6133 6134 // If this is a redeclaration, check that the type we just deduced matches 6135 // the previously declared type. 6136 if (VarDecl *Old = VDecl->getPreviousDecl()) 6137 MergeVarDeclTypes(VDecl, Old); 6138 } 6139 6140 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6141 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6142 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6143 VDecl->setInvalidDecl(); 6144 return; 6145 } 6146 6147 if (!VDecl->getType()->isDependentType()) { 6148 // A definition must end up with a complete type, which means it must be 6149 // complete with the restriction that an array type might be completed by 6150 // the initializer; note that later code assumes this restriction. 6151 QualType BaseDeclType = VDecl->getType(); 6152 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6153 BaseDeclType = Array->getElementType(); 6154 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6155 diag::err_typecheck_decl_incomplete_type)) { 6156 RealDecl->setInvalidDecl(); 6157 return; 6158 } 6159 6160 // The variable can not have an abstract class type. 6161 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6162 diag::err_abstract_type_in_decl, 6163 AbstractVariableType)) 6164 VDecl->setInvalidDecl(); 6165 } 6166 6167 const VarDecl *Def; 6168 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6169 Diag(VDecl->getLocation(), diag::err_redefinition) 6170 << VDecl->getDeclName(); 6171 Diag(Def->getLocation(), diag::note_previous_definition); 6172 VDecl->setInvalidDecl(); 6173 return; 6174 } 6175 6176 const VarDecl* PrevInit = 0; 6177 if (getLangOpts().CPlusPlus) { 6178 // C++ [class.static.data]p4 6179 // If a static data member is of const integral or const 6180 // enumeration type, its declaration in the class definition can 6181 // specify a constant-initializer which shall be an integral 6182 // constant expression (5.19). In that case, the member can appear 6183 // in integral constant expressions. The member shall still be 6184 // defined in a namespace scope if it is used in the program and the 6185 // namespace scope definition shall not contain an initializer. 6186 // 6187 // We already performed a redefinition check above, but for static 6188 // data members we also need to check whether there was an in-class 6189 // declaration with an initializer. 6190 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6191 Diag(VDecl->getLocation(), diag::err_redefinition) 6192 << VDecl->getDeclName(); 6193 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6194 return; 6195 } 6196 6197 if (VDecl->hasLocalStorage()) 6198 getCurFunction()->setHasBranchProtectedScope(); 6199 6200 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6201 VDecl->setInvalidDecl(); 6202 return; 6203 } 6204 } 6205 6206 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6207 // a kernel function cannot be initialized." 6208 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6209 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6210 VDecl->setInvalidDecl(); 6211 return; 6212 } 6213 6214 // Get the decls type and save a reference for later, since 6215 // CheckInitializerTypes may change it. 6216 QualType DclT = VDecl->getType(), SavT = DclT; 6217 6218 // Top-level message sends default to 'id' when we're in a debugger 6219 // and we are assigning it to a variable of 'id' type. 6220 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCIdType()) 6221 if (Init->getType() == Context.UnknownAnyTy && isa<ObjCMessageExpr>(Init)) { 6222 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); 6223 if (Result.isInvalid()) { 6224 VDecl->setInvalidDecl(); 6225 return; 6226 } 6227 Init = Result.take(); 6228 } 6229 6230 // Perform the initialization. 6231 if (!VDecl->isInvalidDecl()) { 6232 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6233 InitializationKind Kind 6234 = DirectInit ? 6235 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6236 Init->getLocStart(), 6237 Init->getLocEnd()) 6238 : InitializationKind::CreateDirectList( 6239 VDecl->getLocation()) 6240 : InitializationKind::CreateCopy(VDecl->getLocation(), 6241 Init->getLocStart()); 6242 6243 Expr **Args = &Init; 6244 unsigned NumArgs = 1; 6245 if (CXXDirectInit) { 6246 Args = CXXDirectInit->getExprs(); 6247 NumArgs = CXXDirectInit->getNumExprs(); 6248 } 6249 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs); 6250 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6251 MultiExprArg(*this, Args,NumArgs), 6252 &DclT); 6253 if (Result.isInvalid()) { 6254 VDecl->setInvalidDecl(); 6255 return; 6256 } 6257 6258 Init = Result.takeAs<Expr>(); 6259 } 6260 6261 // If the type changed, it means we had an incomplete type that was 6262 // completed by the initializer. For example: 6263 // int ary[] = { 1, 3, 5 }; 6264 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6265 if (!VDecl->isInvalidDecl() && (DclT != SavT)) 6266 VDecl->setType(DclT); 6267 6268 // Check any implicit conversions within the expression. 6269 CheckImplicitConversions(Init, VDecl->getLocation()); 6270 6271 if (!VDecl->isInvalidDecl()) 6272 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6273 6274 Init = MaybeCreateExprWithCleanups(Init); 6275 // Attach the initializer to the decl. 6276 VDecl->setInit(Init); 6277 6278 if (VDecl->isLocalVarDecl()) { 6279 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6280 // static storage duration shall be constant expressions or string literals. 6281 // C++ does not have this restriction. 6282 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() && 6283 VDecl->getStorageClass() == SC_Static) 6284 CheckForConstantInitializer(Init, DclT); 6285 } else if (VDecl->isStaticDataMember() && 6286 VDecl->getLexicalDeclContext()->isRecord()) { 6287 // This is an in-class initialization for a static data member, e.g., 6288 // 6289 // struct S { 6290 // static const int value = 17; 6291 // }; 6292 6293 // C++ [class.mem]p4: 6294 // A member-declarator can contain a constant-initializer only 6295 // if it declares a static member (9.4) of const integral or 6296 // const enumeration type, see 9.4.2. 6297 // 6298 // C++11 [class.static.data]p3: 6299 // If a non-volatile const static data member is of integral or 6300 // enumeration type, its declaration in the class definition can 6301 // specify a brace-or-equal-initializer in which every initalizer-clause 6302 // that is an assignment-expression is a constant expression. A static 6303 // data member of literal type can be declared in the class definition 6304 // with the constexpr specifier; if so, its declaration shall specify a 6305 // brace-or-equal-initializer in which every initializer-clause that is 6306 // an assignment-expression is a constant expression. 6307 6308 // Do nothing on dependent types. 6309 if (DclT->isDependentType()) { 6310 6311 // Allow any 'static constexpr' members, whether or not they are of literal 6312 // type. We separately check that every constexpr variable is of literal 6313 // type. 6314 } else if (VDecl->isConstexpr()) { 6315 6316 // Require constness. 6317 } else if (!DclT.isConstQualified()) { 6318 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6319 << Init->getSourceRange(); 6320 VDecl->setInvalidDecl(); 6321 6322 // We allow integer constant expressions in all cases. 6323 } else if (DclT->isIntegralOrEnumerationType()) { 6324 // Check whether the expression is a constant expression. 6325 SourceLocation Loc; 6326 if (getLangOpts().CPlusPlus0x && DclT.isVolatileQualified()) 6327 // In C++11, a non-constexpr const static data member with an 6328 // in-class initializer cannot be volatile. 6329 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6330 else if (Init->isValueDependent()) 6331 ; // Nothing to check. 6332 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6333 ; // Ok, it's an ICE! 6334 else if (Init->isEvaluatable(Context)) { 6335 // If we can constant fold the initializer through heroics, accept it, 6336 // but report this as a use of an extension for -pedantic. 6337 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6338 << Init->getSourceRange(); 6339 } else { 6340 // Otherwise, this is some crazy unknown case. Report the issue at the 6341 // location provided by the isIntegerConstantExpr failed check. 6342 Diag(Loc, diag::err_in_class_initializer_non_constant) 6343 << Init->getSourceRange(); 6344 VDecl->setInvalidDecl(); 6345 } 6346 6347 // We allow foldable floating-point constants as an extension. 6348 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6349 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6350 << DclT << Init->getSourceRange(); 6351 if (getLangOpts().CPlusPlus0x) 6352 Diag(VDecl->getLocation(), 6353 diag::note_in_class_initializer_float_type_constexpr) 6354 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6355 6356 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6357 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6358 << Init->getSourceRange(); 6359 VDecl->setInvalidDecl(); 6360 } 6361 6362 // Suggest adding 'constexpr' in C++11 for literal types. 6363 } else if (getLangOpts().CPlusPlus0x && DclT->isLiteralType()) { 6364 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6365 << DclT << Init->getSourceRange() 6366 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6367 VDecl->setConstexpr(true); 6368 6369 } else { 6370 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6371 << DclT << Init->getSourceRange(); 6372 VDecl->setInvalidDecl(); 6373 } 6374 } else if (VDecl->isFileVarDecl()) { 6375 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6376 (!getLangOpts().CPlusPlus || 6377 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6378 Diag(VDecl->getLocation(), diag::warn_extern_init); 6379 6380 // C99 6.7.8p4. All file scoped initializers need to be constant. 6381 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) 6382 CheckForConstantInitializer(Init, DclT); 6383 } 6384 6385 // We will represent direct-initialization similarly to copy-initialization: 6386 // int x(1); -as-> int x = 1; 6387 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6388 // 6389 // Clients that want to distinguish between the two forms, can check for 6390 // direct initializer using VarDecl::getInitStyle(). 6391 // A major benefit is that clients that don't particularly care about which 6392 // exactly form was it (like the CodeGen) can handle both cases without 6393 // special case code. 6394 6395 // C++ 8.5p11: 6396 // The form of initialization (using parentheses or '=') is generally 6397 // insignificant, but does matter when the entity being initialized has a 6398 // class type. 6399 if (CXXDirectInit) { 6400 assert(DirectInit && "Call-style initializer must be direct init."); 6401 VDecl->setInitStyle(VarDecl::CallInit); 6402 } else if (DirectInit) { 6403 // This must be list-initialization. No other way is direct-initialization. 6404 VDecl->setInitStyle(VarDecl::ListInit); 6405 } 6406 6407 CheckCompleteVariableDeclaration(VDecl); 6408} 6409 6410/// ActOnInitializerError - Given that there was an error parsing an 6411/// initializer for the given declaration, try to return to some form 6412/// of sanity. 6413void Sema::ActOnInitializerError(Decl *D) { 6414 // Our main concern here is re-establishing invariants like "a 6415 // variable's type is either dependent or complete". 6416 if (!D || D->isInvalidDecl()) return; 6417 6418 VarDecl *VD = dyn_cast<VarDecl>(D); 6419 if (!VD) return; 6420 6421 // Auto types are meaningless if we can't make sense of the initializer. 6422 if (ParsingInitForAutoVars.count(D)) { 6423 D->setInvalidDecl(); 6424 return; 6425 } 6426 6427 QualType Ty = VD->getType(); 6428 if (Ty->isDependentType()) return; 6429 6430 // Require a complete type. 6431 if (RequireCompleteType(VD->getLocation(), 6432 Context.getBaseElementType(Ty), 6433 diag::err_typecheck_decl_incomplete_type)) { 6434 VD->setInvalidDecl(); 6435 return; 6436 } 6437 6438 // Require an abstract type. 6439 if (RequireNonAbstractType(VD->getLocation(), Ty, 6440 diag::err_abstract_type_in_decl, 6441 AbstractVariableType)) { 6442 VD->setInvalidDecl(); 6443 return; 6444 } 6445 6446 // Don't bother complaining about constructors or destructors, 6447 // though. 6448} 6449 6450void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6451 bool TypeMayContainAuto) { 6452 // If there is no declaration, there was an error parsing it. Just ignore it. 6453 if (RealDecl == 0) 6454 return; 6455 6456 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6457 QualType Type = Var->getType(); 6458 6459 // C++11 [dcl.spec.auto]p3 6460 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6461 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6462 << Var->getDeclName() << Type; 6463 Var->setInvalidDecl(); 6464 return; 6465 } 6466 6467 // C++11 [class.static.data]p3: A static data member can be declared with 6468 // the constexpr specifier; if so, its declaration shall specify 6469 // a brace-or-equal-initializer. 6470 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6471 // the definition of a variable [...] or the declaration of a static data 6472 // member. 6473 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6474 if (Var->isStaticDataMember()) 6475 Diag(Var->getLocation(), 6476 diag::err_constexpr_static_mem_var_requires_init) 6477 << Var->getDeclName(); 6478 else 6479 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6480 Var->setInvalidDecl(); 6481 return; 6482 } 6483 6484 switch (Var->isThisDeclarationADefinition()) { 6485 case VarDecl::Definition: 6486 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6487 break; 6488 6489 // We have an out-of-line definition of a static data member 6490 // that has an in-class initializer, so we type-check this like 6491 // a declaration. 6492 // 6493 // Fall through 6494 6495 case VarDecl::DeclarationOnly: 6496 // It's only a declaration. 6497 6498 // Block scope. C99 6.7p7: If an identifier for an object is 6499 // declared with no linkage (C99 6.2.2p6), the type for the 6500 // object shall be complete. 6501 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6502 !Var->getLinkage() && !Var->isInvalidDecl() && 6503 RequireCompleteType(Var->getLocation(), Type, 6504 diag::err_typecheck_decl_incomplete_type)) 6505 Var->setInvalidDecl(); 6506 6507 // Make sure that the type is not abstract. 6508 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6509 RequireNonAbstractType(Var->getLocation(), Type, 6510 diag::err_abstract_type_in_decl, 6511 AbstractVariableType)) 6512 Var->setInvalidDecl(); 6513 return; 6514 6515 case VarDecl::TentativeDefinition: 6516 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6517 // object that has file scope without an initializer, and without a 6518 // storage-class specifier or with the storage-class specifier "static", 6519 // constitutes a tentative definition. Note: A tentative definition with 6520 // external linkage is valid (C99 6.2.2p5). 6521 if (!Var->isInvalidDecl()) { 6522 if (const IncompleteArrayType *ArrayT 6523 = Context.getAsIncompleteArrayType(Type)) { 6524 if (RequireCompleteType(Var->getLocation(), 6525 ArrayT->getElementType(), 6526 diag::err_illegal_decl_array_incomplete_type)) 6527 Var->setInvalidDecl(); 6528 } else if (Var->getStorageClass() == SC_Static) { 6529 // C99 6.9.2p3: If the declaration of an identifier for an object is 6530 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6531 // declared type shall not be an incomplete type. 6532 // NOTE: code such as the following 6533 // static struct s; 6534 // struct s { int a; }; 6535 // is accepted by gcc. Hence here we issue a warning instead of 6536 // an error and we do not invalidate the static declaration. 6537 // NOTE: to avoid multiple warnings, only check the first declaration. 6538 if (Var->getPreviousDecl() == 0) 6539 RequireCompleteType(Var->getLocation(), Type, 6540 diag::ext_typecheck_decl_incomplete_type); 6541 } 6542 } 6543 6544 // Record the tentative definition; we're done. 6545 if (!Var->isInvalidDecl()) 6546 TentativeDefinitions.push_back(Var); 6547 return; 6548 } 6549 6550 // Provide a specific diagnostic for uninitialized variable 6551 // definitions with incomplete array type. 6552 if (Type->isIncompleteArrayType()) { 6553 Diag(Var->getLocation(), 6554 diag::err_typecheck_incomplete_array_needs_initializer); 6555 Var->setInvalidDecl(); 6556 return; 6557 } 6558 6559 // Provide a specific diagnostic for uninitialized variable 6560 // definitions with reference type. 6561 if (Type->isReferenceType()) { 6562 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6563 << Var->getDeclName() 6564 << SourceRange(Var->getLocation(), Var->getLocation()); 6565 Var->setInvalidDecl(); 6566 return; 6567 } 6568 6569 // Do not attempt to type-check the default initializer for a 6570 // variable with dependent type. 6571 if (Type->isDependentType()) 6572 return; 6573 6574 if (Var->isInvalidDecl()) 6575 return; 6576 6577 if (RequireCompleteType(Var->getLocation(), 6578 Context.getBaseElementType(Type), 6579 diag::err_typecheck_decl_incomplete_type)) { 6580 Var->setInvalidDecl(); 6581 return; 6582 } 6583 6584 // The variable can not have an abstract class type. 6585 if (RequireNonAbstractType(Var->getLocation(), Type, 6586 diag::err_abstract_type_in_decl, 6587 AbstractVariableType)) { 6588 Var->setInvalidDecl(); 6589 return; 6590 } 6591 6592 // Check for jumps past the implicit initializer. C++0x 6593 // clarifies that this applies to a "variable with automatic 6594 // storage duration", not a "local variable". 6595 // C++11 [stmt.dcl]p3 6596 // A program that jumps from a point where a variable with automatic 6597 // storage duration is not in scope to a point where it is in scope is 6598 // ill-formed unless the variable has scalar type, class type with a 6599 // trivial default constructor and a trivial destructor, a cv-qualified 6600 // version of one of these types, or an array of one of the preceding 6601 // types and is declared without an initializer. 6602 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) { 6603 if (const RecordType *Record 6604 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6605 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6606 // Mark the function for further checking even if the looser rules of 6607 // C++11 do not require such checks, so that we can diagnose 6608 // incompatibilities with C++98. 6609 if (!CXXRecord->isPOD()) 6610 getCurFunction()->setHasBranchProtectedScope(); 6611 } 6612 } 6613 6614 // C++03 [dcl.init]p9: 6615 // If no initializer is specified for an object, and the 6616 // object is of (possibly cv-qualified) non-POD class type (or 6617 // array thereof), the object shall be default-initialized; if 6618 // the object is of const-qualified type, the underlying class 6619 // type shall have a user-declared default 6620 // constructor. Otherwise, if no initializer is specified for 6621 // a non- static object, the object and its subobjects, if 6622 // any, have an indeterminate initial value); if the object 6623 // or any of its subobjects are of const-qualified type, the 6624 // program is ill-formed. 6625 // C++0x [dcl.init]p11: 6626 // If no initializer is specified for an object, the object is 6627 // default-initialized; [...]. 6628 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6629 InitializationKind Kind 6630 = InitializationKind::CreateDefault(Var->getLocation()); 6631 6632 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6633 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6634 MultiExprArg(*this, 0, 0)); 6635 if (Init.isInvalid()) 6636 Var->setInvalidDecl(); 6637 else if (Init.get()) { 6638 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6639 // This is important for template substitution. 6640 Var->setInitStyle(VarDecl::CallInit); 6641 } 6642 6643 CheckCompleteVariableDeclaration(Var); 6644 } 6645} 6646 6647void Sema::ActOnCXXForRangeDecl(Decl *D) { 6648 VarDecl *VD = dyn_cast<VarDecl>(D); 6649 if (!VD) { 6650 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6651 D->setInvalidDecl(); 6652 return; 6653 } 6654 6655 VD->setCXXForRangeDecl(true); 6656 6657 // for-range-declaration cannot be given a storage class specifier. 6658 int Error = -1; 6659 switch (VD->getStorageClassAsWritten()) { 6660 case SC_None: 6661 break; 6662 case SC_Extern: 6663 Error = 0; 6664 break; 6665 case SC_Static: 6666 Error = 1; 6667 break; 6668 case SC_PrivateExtern: 6669 Error = 2; 6670 break; 6671 case SC_Auto: 6672 Error = 3; 6673 break; 6674 case SC_Register: 6675 Error = 4; 6676 break; 6677 case SC_OpenCLWorkGroupLocal: 6678 llvm_unreachable("Unexpected storage class"); 6679 } 6680 if (VD->isConstexpr()) 6681 Error = 5; 6682 if (Error != -1) { 6683 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6684 << VD->getDeclName() << Error; 6685 D->setInvalidDecl(); 6686 } 6687} 6688 6689void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6690 if (var->isInvalidDecl()) return; 6691 6692 // In ARC, don't allow jumps past the implicit initialization of a 6693 // local retaining variable. 6694 if (getLangOpts().ObjCAutoRefCount && 6695 var->hasLocalStorage()) { 6696 switch (var->getType().getObjCLifetime()) { 6697 case Qualifiers::OCL_None: 6698 case Qualifiers::OCL_ExplicitNone: 6699 case Qualifiers::OCL_Autoreleasing: 6700 break; 6701 6702 case Qualifiers::OCL_Weak: 6703 case Qualifiers::OCL_Strong: 6704 getCurFunction()->setHasBranchProtectedScope(); 6705 break; 6706 } 6707 } 6708 6709 // All the following checks are C++ only. 6710 if (!getLangOpts().CPlusPlus) return; 6711 6712 QualType baseType = Context.getBaseElementType(var->getType()); 6713 if (baseType->isDependentType()) return; 6714 6715 // __block variables might require us to capture a copy-initializer. 6716 if (var->hasAttr<BlocksAttr>()) { 6717 // It's currently invalid to ever have a __block variable with an 6718 // array type; should we diagnose that here? 6719 6720 // Regardless, we don't want to ignore array nesting when 6721 // constructing this copy. 6722 QualType type = var->getType(); 6723 6724 if (type->isStructureOrClassType()) { 6725 SourceLocation poi = var->getLocation(); 6726 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi); 6727 ExprResult result = 6728 PerformCopyInitialization( 6729 InitializedEntity::InitializeBlock(poi, type, false), 6730 poi, Owned(varRef)); 6731 if (!result.isInvalid()) { 6732 result = MaybeCreateExprWithCleanups(result); 6733 Expr *init = result.takeAs<Expr>(); 6734 Context.setBlockVarCopyInits(var, init); 6735 } 6736 } 6737 } 6738 6739 Expr *Init = var->getInit(); 6740 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6741 6742 if (!var->getDeclContext()->isDependentContext() && Init) { 6743 if (IsGlobal && !var->isConstexpr() && 6744 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6745 var->getLocation()) 6746 != DiagnosticsEngine::Ignored && 6747 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6748 Diag(var->getLocation(), diag::warn_global_constructor) 6749 << Init->getSourceRange(); 6750 6751 if (var->isConstexpr()) { 6752 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6753 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6754 SourceLocation DiagLoc = var->getLocation(); 6755 // If the note doesn't add any useful information other than a source 6756 // location, fold it into the primary diagnostic. 6757 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6758 diag::note_invalid_subexpr_in_const_expr) { 6759 DiagLoc = Notes[0].first; 6760 Notes.clear(); 6761 } 6762 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6763 << var << Init->getSourceRange(); 6764 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6765 Diag(Notes[I].first, Notes[I].second); 6766 } 6767 } else if (var->isUsableInConstantExpressions(Context)) { 6768 // Check whether the initializer of a const variable of integral or 6769 // enumeration type is an ICE now, since we can't tell whether it was 6770 // initialized by a constant expression if we check later. 6771 var->checkInitIsICE(); 6772 } 6773 } 6774 6775 // Require the destructor. 6776 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6777 FinalizeVarWithDestructor(var, recordType); 6778} 6779 6780/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6781/// any semantic actions necessary after any initializer has been attached. 6782void 6783Sema::FinalizeDeclaration(Decl *ThisDecl) { 6784 // Note that we are no longer parsing the initializer for this declaration. 6785 ParsingInitForAutoVars.erase(ThisDecl); 6786} 6787 6788Sema::DeclGroupPtrTy 6789Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6790 Decl **Group, unsigned NumDecls) { 6791 SmallVector<Decl*, 8> Decls; 6792 6793 if (DS.isTypeSpecOwned()) 6794 Decls.push_back(DS.getRepAsDecl()); 6795 6796 for (unsigned i = 0; i != NumDecls; ++i) 6797 if (Decl *D = Group[i]) 6798 Decls.push_back(D); 6799 6800 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6801 DS.getTypeSpecType() == DeclSpec::TST_auto); 6802} 6803 6804/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6805/// group, performing any necessary semantic checking. 6806Sema::DeclGroupPtrTy 6807Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6808 bool TypeMayContainAuto) { 6809 // C++0x [dcl.spec.auto]p7: 6810 // If the type deduced for the template parameter U is not the same in each 6811 // deduction, the program is ill-formed. 6812 // FIXME: When initializer-list support is added, a distinction is needed 6813 // between the deduced type U and the deduced type which 'auto' stands for. 6814 // auto a = 0, b = { 1, 2, 3 }; 6815 // is legal because the deduced type U is 'int' in both cases. 6816 if (TypeMayContainAuto && NumDecls > 1) { 6817 QualType Deduced; 6818 CanQualType DeducedCanon; 6819 VarDecl *DeducedDecl = 0; 6820 for (unsigned i = 0; i != NumDecls; ++i) { 6821 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6822 AutoType *AT = D->getType()->getContainedAutoType(); 6823 // Don't reissue diagnostics when instantiating a template. 6824 if (AT && D->isInvalidDecl()) 6825 break; 6826 if (AT && AT->isDeduced()) { 6827 QualType U = AT->getDeducedType(); 6828 CanQualType UCanon = Context.getCanonicalType(U); 6829 if (Deduced.isNull()) { 6830 Deduced = U; 6831 DeducedCanon = UCanon; 6832 DeducedDecl = D; 6833 } else if (DeducedCanon != UCanon) { 6834 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6835 diag::err_auto_different_deductions) 6836 << Deduced << DeducedDecl->getDeclName() 6837 << U << D->getDeclName() 6838 << DeducedDecl->getInit()->getSourceRange() 6839 << D->getInit()->getSourceRange(); 6840 D->setInvalidDecl(); 6841 break; 6842 } 6843 } 6844 } 6845 } 6846 } 6847 6848 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6849} 6850 6851 6852/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6853/// to introduce parameters into function prototype scope. 6854Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6855 const DeclSpec &DS = D.getDeclSpec(); 6856 6857 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6858 // C++03 [dcl.stc]p2 also permits 'auto'. 6859 VarDecl::StorageClass StorageClass = SC_None; 6860 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6861 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6862 StorageClass = SC_Register; 6863 StorageClassAsWritten = SC_Register; 6864 } else if (getLangOpts().CPlusPlus && 6865 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6866 StorageClass = SC_Auto; 6867 StorageClassAsWritten = SC_Auto; 6868 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6869 Diag(DS.getStorageClassSpecLoc(), 6870 diag::err_invalid_storage_class_in_func_decl); 6871 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6872 } 6873 6874 if (D.getDeclSpec().isThreadSpecified()) 6875 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6876 if (D.getDeclSpec().isConstexprSpecified()) 6877 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6878 << 0; 6879 6880 DiagnoseFunctionSpecifiers(D); 6881 6882 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6883 QualType parmDeclType = TInfo->getType(); 6884 6885 if (getLangOpts().CPlusPlus) { 6886 // Check that there are no default arguments inside the type of this 6887 // parameter. 6888 CheckExtraCXXDefaultArguments(D); 6889 6890 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6891 if (D.getCXXScopeSpec().isSet()) { 6892 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6893 << D.getCXXScopeSpec().getRange(); 6894 D.getCXXScopeSpec().clear(); 6895 } 6896 } 6897 6898 // Ensure we have a valid name 6899 IdentifierInfo *II = 0; 6900 if (D.hasName()) { 6901 II = D.getIdentifier(); 6902 if (!II) { 6903 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6904 << GetNameForDeclarator(D).getName().getAsString(); 6905 D.setInvalidType(true); 6906 } 6907 } 6908 6909 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6910 if (II) { 6911 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6912 ForRedeclaration); 6913 LookupName(R, S); 6914 if (R.isSingleResult()) { 6915 NamedDecl *PrevDecl = R.getFoundDecl(); 6916 if (PrevDecl->isTemplateParameter()) { 6917 // Maybe we will complain about the shadowed template parameter. 6918 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6919 // Just pretend that we didn't see the previous declaration. 6920 PrevDecl = 0; 6921 } else if (S->isDeclScope(PrevDecl)) { 6922 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6923 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6924 6925 // Recover by removing the name 6926 II = 0; 6927 D.SetIdentifier(0, D.getIdentifierLoc()); 6928 D.setInvalidType(true); 6929 } 6930 } 6931 } 6932 6933 // Temporarily put parameter variables in the translation unit, not 6934 // the enclosing context. This prevents them from accidentally 6935 // looking like class members in C++. 6936 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6937 D.getLocStart(), 6938 D.getIdentifierLoc(), II, 6939 parmDeclType, TInfo, 6940 StorageClass, StorageClassAsWritten); 6941 6942 if (D.isInvalidType()) 6943 New->setInvalidDecl(); 6944 6945 assert(S->isFunctionPrototypeScope()); 6946 assert(S->getFunctionPrototypeDepth() >= 1); 6947 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6948 S->getNextFunctionPrototypeIndex()); 6949 6950 // Add the parameter declaration into this scope. 6951 S->AddDecl(New); 6952 if (II) 6953 IdResolver.AddDecl(New); 6954 6955 ProcessDeclAttributes(S, New, D); 6956 6957 if (D.getDeclSpec().isModulePrivateSpecified()) 6958 Diag(New->getLocation(), diag::err_module_private_local) 6959 << 1 << New->getDeclName() 6960 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6961 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6962 6963 if (New->hasAttr<BlocksAttr>()) { 6964 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6965 } 6966 return New; 6967} 6968 6969/// \brief Synthesizes a variable for a parameter arising from a 6970/// typedef. 6971ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6972 SourceLocation Loc, 6973 QualType T) { 6974 /* FIXME: setting StartLoc == Loc. 6975 Would it be worth to modify callers so as to provide proper source 6976 location for the unnamed parameters, embedding the parameter's type? */ 6977 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6978 T, Context.getTrivialTypeSourceInfo(T, Loc), 6979 SC_None, SC_None, 0); 6980 Param->setImplicit(); 6981 return Param; 6982} 6983 6984void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6985 ParmVarDecl * const *ParamEnd) { 6986 // Don't diagnose unused-parameter errors in template instantiations; we 6987 // will already have done so in the template itself. 6988 if (!ActiveTemplateInstantiations.empty()) 6989 return; 6990 6991 for (; Param != ParamEnd; ++Param) { 6992 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 6993 !(*Param)->hasAttr<UnusedAttr>()) { 6994 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6995 << (*Param)->getDeclName(); 6996 } 6997 } 6998} 6999 7000void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 7001 ParmVarDecl * const *ParamEnd, 7002 QualType ReturnTy, 7003 NamedDecl *D) { 7004 if (LangOpts.NumLargeByValueCopy == 0) // No check. 7005 return; 7006 7007 // Warn if the return value is pass-by-value and larger than the specified 7008 // threshold. 7009 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 7010 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 7011 if (Size > LangOpts.NumLargeByValueCopy) 7012 Diag(D->getLocation(), diag::warn_return_value_size) 7013 << D->getDeclName() << Size; 7014 } 7015 7016 // Warn if any parameter is pass-by-value and larger than the specified 7017 // threshold. 7018 for (; Param != ParamEnd; ++Param) { 7019 QualType T = (*Param)->getType(); 7020 if (T->isDependentType() || !T.isPODType(Context)) 7021 continue; 7022 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 7023 if (Size > LangOpts.NumLargeByValueCopy) 7024 Diag((*Param)->getLocation(), diag::warn_parameter_size) 7025 << (*Param)->getDeclName() << Size; 7026 } 7027} 7028 7029ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 7030 SourceLocation NameLoc, IdentifierInfo *Name, 7031 QualType T, TypeSourceInfo *TSInfo, 7032 VarDecl::StorageClass StorageClass, 7033 VarDecl::StorageClass StorageClassAsWritten) { 7034 // In ARC, infer a lifetime qualifier for appropriate parameter types. 7035 if (getLangOpts().ObjCAutoRefCount && 7036 T.getObjCLifetime() == Qualifiers::OCL_None && 7037 T->isObjCLifetimeType()) { 7038 7039 Qualifiers::ObjCLifetime lifetime; 7040 7041 // Special cases for arrays: 7042 // - if it's const, use __unsafe_unretained 7043 // - otherwise, it's an error 7044 if (T->isArrayType()) { 7045 if (!T.isConstQualified()) { 7046 DelayedDiagnostics.add( 7047 sema::DelayedDiagnostic::makeForbiddenType( 7048 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 7049 } 7050 lifetime = Qualifiers::OCL_ExplicitNone; 7051 } else { 7052 lifetime = T->getObjCARCImplicitLifetime(); 7053 } 7054 T = Context.getLifetimeQualifiedType(T, lifetime); 7055 } 7056 7057 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 7058 Context.getAdjustedParameterType(T), 7059 TSInfo, 7060 StorageClass, StorageClassAsWritten, 7061 0); 7062 7063 // Parameters can not be abstract class types. 7064 // For record types, this is done by the AbstractClassUsageDiagnoser once 7065 // the class has been completely parsed. 7066 if (!CurContext->isRecord() && 7067 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 7068 AbstractParamType)) 7069 New->setInvalidDecl(); 7070 7071 // Parameter declarators cannot be interface types. All ObjC objects are 7072 // passed by reference. 7073 if (T->isObjCObjectType()) { 7074 Diag(NameLoc, 7075 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 7076 << FixItHint::CreateInsertion(NameLoc, "*"); 7077 T = Context.getObjCObjectPointerType(T); 7078 New->setType(T); 7079 } 7080 7081 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 7082 // duration shall not be qualified by an address-space qualifier." 7083 // Since all parameters have automatic store duration, they can not have 7084 // an address space. 7085 if (T.getAddressSpace() != 0) { 7086 Diag(NameLoc, diag::err_arg_with_address_space); 7087 New->setInvalidDecl(); 7088 } 7089 7090 return New; 7091} 7092 7093void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 7094 SourceLocation LocAfterDecls) { 7095 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 7096 7097 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 7098 // for a K&R function. 7099 if (!FTI.hasPrototype) { 7100 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 7101 --i; 7102 if (FTI.ArgInfo[i].Param == 0) { 7103 SmallString<256> Code; 7104 llvm::raw_svector_ostream(Code) << " int " 7105 << FTI.ArgInfo[i].Ident->getName() 7106 << ";\n"; 7107 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 7108 << FTI.ArgInfo[i].Ident 7109 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 7110 7111 // Implicitly declare the argument as type 'int' for lack of a better 7112 // type. 7113 AttributeFactory attrs; 7114 DeclSpec DS(attrs); 7115 const char* PrevSpec; // unused 7116 unsigned DiagID; // unused 7117 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 7118 PrevSpec, DiagID); 7119 Declarator ParamD(DS, Declarator::KNRTypeListContext); 7120 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 7121 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 7122 } 7123 } 7124 } 7125} 7126 7127Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 7128 Declarator &D) { 7129 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 7130 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 7131 Scope *ParentScope = FnBodyScope->getParent(); 7132 7133 D.setFunctionDefinitionKind(FDK_Definition); 7134 Decl *DP = HandleDeclarator(ParentScope, D, 7135 MultiTemplateParamsArg(*this)); 7136 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7137} 7138 7139static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7140 // Don't warn about invalid declarations. 7141 if (FD->isInvalidDecl()) 7142 return false; 7143 7144 // Or declarations that aren't global. 7145 if (!FD->isGlobal()) 7146 return false; 7147 7148 // Don't warn about C++ member functions. 7149 if (isa<CXXMethodDecl>(FD)) 7150 return false; 7151 7152 // Don't warn about 'main'. 7153 if (FD->isMain()) 7154 return false; 7155 7156 // Don't warn about inline functions. 7157 if (FD->isInlined()) 7158 return false; 7159 7160 // Don't warn about function templates. 7161 if (FD->getDescribedFunctionTemplate()) 7162 return false; 7163 7164 // Don't warn about function template specializations. 7165 if (FD->isFunctionTemplateSpecialization()) 7166 return false; 7167 7168 bool MissingPrototype = true; 7169 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7170 Prev; Prev = Prev->getPreviousDecl()) { 7171 // Ignore any declarations that occur in function or method 7172 // scope, because they aren't visible from the header. 7173 if (Prev->getDeclContext()->isFunctionOrMethod()) 7174 continue; 7175 7176 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7177 break; 7178 } 7179 7180 return MissingPrototype; 7181} 7182 7183void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7184 // Don't complain if we're in GNU89 mode and the previous definition 7185 // was an extern inline function. 7186 const FunctionDecl *Definition; 7187 if (FD->isDefined(Definition) && 7188 !canRedefineFunction(Definition, getLangOpts())) { 7189 if (getLangOpts().GNUMode && Definition->isInlineSpecified() && 7190 Definition->getStorageClass() == SC_Extern) 7191 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7192 << FD->getDeclName() << getLangOpts().CPlusPlus; 7193 else 7194 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7195 Diag(Definition->getLocation(), diag::note_previous_definition); 7196 } 7197} 7198 7199Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7200 // Clear the last template instantiation error context. 7201 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7202 7203 if (!D) 7204 return D; 7205 FunctionDecl *FD = 0; 7206 7207 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7208 FD = FunTmpl->getTemplatedDecl(); 7209 else 7210 FD = cast<FunctionDecl>(D); 7211 7212 // Enter a new function scope 7213 PushFunctionScope(); 7214 7215 // See if this is a redefinition. 7216 if (!FD->isLateTemplateParsed()) 7217 CheckForFunctionRedefinition(FD); 7218 7219 // Builtin functions cannot be defined. 7220 if (unsigned BuiltinID = FD->getBuiltinID()) { 7221 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7222 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7223 FD->setInvalidDecl(); 7224 } 7225 } 7226 7227 // The return type of a function definition must be complete 7228 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7229 QualType ResultType = FD->getResultType(); 7230 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7231 !FD->isInvalidDecl() && 7232 RequireCompleteType(FD->getLocation(), ResultType, 7233 diag::err_func_def_incomplete_result)) 7234 FD->setInvalidDecl(); 7235 7236 // GNU warning -Wmissing-prototypes: 7237 // Warn if a global function is defined without a previous 7238 // prototype declaration. This warning is issued even if the 7239 // definition itself provides a prototype. The aim is to detect 7240 // global functions that fail to be declared in header files. 7241 if (ShouldWarnAboutMissingPrototype(FD)) 7242 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7243 7244 if (FnBodyScope) 7245 PushDeclContext(FnBodyScope, FD); 7246 7247 // Check the validity of our function parameters 7248 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7249 /*CheckParameterNames=*/true); 7250 7251 // Introduce our parameters into the function scope 7252 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7253 ParmVarDecl *Param = FD->getParamDecl(p); 7254 Param->setOwningFunction(FD); 7255 7256 // If this has an identifier, add it to the scope stack. 7257 if (Param->getIdentifier() && FnBodyScope) { 7258 CheckShadow(FnBodyScope, Param); 7259 7260 PushOnScopeChains(Param, FnBodyScope); 7261 } 7262 } 7263 7264 // If we had any tags defined in the function prototype, 7265 // introduce them into the function scope. 7266 if (FnBodyScope) { 7267 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(), 7268 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) { 7269 NamedDecl *D = *I; 7270 7271 // Some of these decls (like enums) may have been pinned to the translation unit 7272 // for lack of a real context earlier. If so, remove from the translation unit 7273 // and reattach to the current context. 7274 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) { 7275 // Is the decl actually in the context? 7276 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(), 7277 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) { 7278 if (*DI == D) { 7279 Context.getTranslationUnitDecl()->removeDecl(D); 7280 break; 7281 } 7282 } 7283 // Either way, reassign the lexical decl context to our FunctionDecl. 7284 D->setLexicalDeclContext(CurContext); 7285 } 7286 7287 // If the decl has a non-null name, make accessible in the current scope. 7288 if (!D->getName().empty()) 7289 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false); 7290 7291 // Similarly, dive into enums and fish their constants out, making them 7292 // accessible in this scope. 7293 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) { 7294 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(), 7295 EE = ED->enumerator_end(); EI != EE; ++EI) 7296 PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false); 7297 } 7298 } 7299 } 7300 7301 // Checking attributes of current function definition 7302 // dllimport attribute. 7303 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7304 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7305 // dllimport attribute cannot be directly applied to definition. 7306 // Microsoft accepts dllimport for functions defined within class scope. 7307 if (!DA->isInherited() && 7308 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7309 Diag(FD->getLocation(), 7310 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7311 << "dllimport"; 7312 FD->setInvalidDecl(); 7313 return FD; 7314 } 7315 7316 // Visual C++ appears to not think this is an issue, so only issue 7317 // a warning when Microsoft extensions are disabled. 7318 if (!LangOpts.MicrosoftExt) { 7319 // If a symbol previously declared dllimport is later defined, the 7320 // attribute is ignored in subsequent references, and a warning is 7321 // emitted. 7322 Diag(FD->getLocation(), 7323 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7324 << FD->getName() << "dllimport"; 7325 } 7326 } 7327 return FD; 7328} 7329 7330/// \brief Given the set of return statements within a function body, 7331/// compute the variables that are subject to the named return value 7332/// optimization. 7333/// 7334/// Each of the variables that is subject to the named return value 7335/// optimization will be marked as NRVO variables in the AST, and any 7336/// return statement that has a marked NRVO variable as its NRVO candidate can 7337/// use the named return value optimization. 7338/// 7339/// This function applies a very simplistic algorithm for NRVO: if every return 7340/// statement in the function has the same NRVO candidate, that candidate is 7341/// the NRVO variable. 7342/// 7343/// FIXME: Employ a smarter algorithm that accounts for multiple return 7344/// statements and the lifetimes of the NRVO candidates. We should be able to 7345/// find a maximal set of NRVO variables. 7346void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7347 ReturnStmt **Returns = Scope->Returns.data(); 7348 7349 const VarDecl *NRVOCandidate = 0; 7350 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7351 if (!Returns[I]->getNRVOCandidate()) 7352 return; 7353 7354 if (!NRVOCandidate) 7355 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7356 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7357 return; 7358 } 7359 7360 if (NRVOCandidate) 7361 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7362} 7363 7364Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7365 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7366} 7367 7368Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7369 bool IsInstantiation) { 7370 FunctionDecl *FD = 0; 7371 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7372 if (FunTmpl) 7373 FD = FunTmpl->getTemplatedDecl(); 7374 else 7375 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7376 7377 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7378 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7379 7380 if (FD) { 7381 FD->setBody(Body); 7382 7383 // If the function implicitly returns zero (like 'main') or is naked, 7384 // don't complain about missing return statements. 7385 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) 7386 WP.disableCheckFallThrough(); 7387 7388 // MSVC permits the use of pure specifier (=0) on function definition, 7389 // defined at class scope, warn about this non standard construct. 7390 if (getLangOpts().MicrosoftExt && FD->isPure()) 7391 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7392 7393 if (!FD->isInvalidDecl()) { 7394 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7395 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7396 FD->getResultType(), FD); 7397 7398 // If this is a constructor, we need a vtable. 7399 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7400 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7401 7402 computeNRVO(Body, getCurFunction()); 7403 } 7404 7405 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 7406 "Function parsing confused"); 7407 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7408 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7409 MD->setBody(Body); 7410 if (Body) 7411 MD->setEndLoc(Body->getLocEnd()); 7412 if (!MD->isInvalidDecl()) { 7413 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7414 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7415 MD->getResultType(), MD); 7416 7417 if (Body) 7418 computeNRVO(Body, getCurFunction()); 7419 } 7420 if (ObjCShouldCallSuperDealloc) { 7421 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7422 ObjCShouldCallSuperDealloc = false; 7423 } 7424 if (ObjCShouldCallSuperFinalize) { 7425 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7426 ObjCShouldCallSuperFinalize = false; 7427 } 7428 } else { 7429 return 0; 7430 } 7431 7432 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7433 "ObjC methods, which should have been handled in the block above."); 7434 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7435 "ObjC methods, which should have been handled in the block above."); 7436 7437 // Verify and clean out per-function state. 7438 if (Body) { 7439 // C++ constructors that have function-try-blocks can't have return 7440 // statements in the handlers of that block. (C++ [except.handle]p14) 7441 // Verify this. 7442 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7443 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7444 7445 // Verify that gotos and switch cases don't jump into scopes illegally. 7446 if (getCurFunction()->NeedsScopeChecking() && 7447 !dcl->isInvalidDecl() && 7448 !hasAnyUnrecoverableErrorsInThisFunction()) 7449 DiagnoseInvalidJumps(Body); 7450 7451 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7452 if (!Destructor->getParent()->isDependentType()) 7453 CheckDestructor(Destructor); 7454 7455 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7456 Destructor->getParent()); 7457 } 7458 7459 // If any errors have occurred, clear out any temporaries that may have 7460 // been leftover. This ensures that these temporaries won't be picked up for 7461 // deletion in some later function. 7462 if (PP.getDiagnostics().hasErrorOccurred() || 7463 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7464 DiscardCleanupsInEvaluationContext(); 7465 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7466 // Since the body is valid, issue any analysis-based warnings that are 7467 // enabled. 7468 ActivePolicy = &WP; 7469 } 7470 7471 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7472 (!CheckConstexprFunctionDecl(FD) || 7473 !CheckConstexprFunctionBody(FD, Body))) 7474 FD->setInvalidDecl(); 7475 7476 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7477 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7478 assert(MaybeODRUseExprs.empty() && 7479 "Leftover expressions for odr-use checking"); 7480 } 7481 7482 if (!IsInstantiation) 7483 PopDeclContext(); 7484 7485 PopFunctionScopeInfo(ActivePolicy, dcl); 7486 7487 // If any errors have occurred, clear out any temporaries that may have 7488 // been leftover. This ensures that these temporaries won't be picked up for 7489 // deletion in some later function. 7490 if (getDiagnostics().hasErrorOccurred()) { 7491 DiscardCleanupsInEvaluationContext(); 7492 } 7493 7494 return dcl; 7495} 7496 7497 7498/// When we finish delayed parsing of an attribute, we must attach it to the 7499/// relevant Decl. 7500void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7501 ParsedAttributes &Attrs) { 7502 // Always attach attributes to the underlying decl. 7503 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7504 D = TD->getTemplatedDecl(); 7505 ProcessDeclAttributeList(S, D, Attrs.getList()); 7506} 7507 7508 7509/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7510/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7511NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7512 IdentifierInfo &II, Scope *S) { 7513 // Before we produce a declaration for an implicitly defined 7514 // function, see whether there was a locally-scoped declaration of 7515 // this name as a function or variable. If so, use that 7516 // (non-visible) declaration, and complain about it. 7517 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7518 = findLocallyScopedExternalDecl(&II); 7519 if (Pos != LocallyScopedExternalDecls.end()) { 7520 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7521 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7522 return Pos->second; 7523 } 7524 7525 // Extension in C99. Legal in C90, but warn about it. 7526 unsigned diag_id; 7527 if (II.getName().startswith("__builtin_")) 7528 diag_id = diag::warn_builtin_unknown; 7529 else if (getLangOpts().C99) 7530 diag_id = diag::ext_implicit_function_decl; 7531 else 7532 diag_id = diag::warn_implicit_function_decl; 7533 Diag(Loc, diag_id) << &II; 7534 7535 // Because typo correction is expensive, only do it if the implicit 7536 // function declaration is going to be treated as an error. 7537 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7538 TypoCorrection Corrected; 7539 DeclFilterCCC<FunctionDecl> Validator; 7540 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7541 LookupOrdinaryName, S, 0, Validator))) { 7542 std::string CorrectedStr = Corrected.getAsString(getLangOpts()); 7543 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts()); 7544 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7545 7546 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7547 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7548 7549 if (Func->getLocation().isValid() 7550 && !II.getName().startswith("__builtin_")) 7551 Diag(Func->getLocation(), diag::note_previous_decl) 7552 << CorrectedQuotedStr; 7553 } 7554 } 7555 7556 // Set a Declarator for the implicit definition: int foo(); 7557 const char *Dummy; 7558 AttributeFactory attrFactory; 7559 DeclSpec DS(attrFactory); 7560 unsigned DiagID; 7561 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7562 (void)Error; // Silence warning. 7563 assert(!Error && "Error setting up implicit decl!"); 7564 Declarator D(DS, Declarator::BlockContext); 7565 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7566 0, 0, true, SourceLocation(), 7567 SourceLocation(), SourceLocation(), 7568 SourceLocation(), 7569 EST_None, SourceLocation(), 7570 0, 0, 0, 0, Loc, Loc, D), 7571 DS.getAttributes(), 7572 SourceLocation()); 7573 D.SetIdentifier(&II, Loc); 7574 7575 // Insert this function into translation-unit scope. 7576 7577 DeclContext *PrevDC = CurContext; 7578 CurContext = Context.getTranslationUnitDecl(); 7579 7580 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7581 FD->setImplicit(); 7582 7583 CurContext = PrevDC; 7584 7585 AddKnownFunctionAttributes(FD); 7586 7587 return FD; 7588} 7589 7590/// \brief Adds any function attributes that we know a priori based on 7591/// the declaration of this function. 7592/// 7593/// These attributes can apply both to implicitly-declared builtins 7594/// (like __builtin___printf_chk) or to library-declared functions 7595/// like NSLog or printf. 7596/// 7597/// We need to check for duplicate attributes both here and where user-written 7598/// attributes are applied to declarations. 7599void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7600 if (FD->isInvalidDecl()) 7601 return; 7602 7603 // If this is a built-in function, map its builtin attributes to 7604 // actual attributes. 7605 if (unsigned BuiltinID = FD->getBuiltinID()) { 7606 // Handle printf-formatting attributes. 7607 unsigned FormatIdx; 7608 bool HasVAListArg; 7609 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7610 if (!FD->getAttr<FormatAttr>()) { 7611 const char *fmt = "printf"; 7612 unsigned int NumParams = FD->getNumParams(); 7613 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7614 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7615 fmt = "NSString"; 7616 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7617 fmt, FormatIdx+1, 7618 HasVAListArg ? 0 : FormatIdx+2)); 7619 } 7620 } 7621 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7622 HasVAListArg)) { 7623 if (!FD->getAttr<FormatAttr>()) 7624 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7625 "scanf", FormatIdx+1, 7626 HasVAListArg ? 0 : FormatIdx+2)); 7627 } 7628 7629 // Mark const if we don't care about errno and that is the only 7630 // thing preventing the function from being const. This allows 7631 // IRgen to use LLVM intrinsics for such functions. 7632 if (!getLangOpts().MathErrno && 7633 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7634 if (!FD->getAttr<ConstAttr>()) 7635 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7636 } 7637 7638 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7639 !FD->getAttr<ReturnsTwiceAttr>()) 7640 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7641 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7642 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7643 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7644 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7645 } 7646 7647 IdentifierInfo *Name = FD->getIdentifier(); 7648 if (!Name) 7649 return; 7650 if ((!getLangOpts().CPlusPlus && 7651 FD->getDeclContext()->isTranslationUnit()) || 7652 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7653 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7654 LinkageSpecDecl::lang_c)) { 7655 // Okay: this could be a libc/libm/Objective-C function we know 7656 // about. 7657 } else 7658 return; 7659 7660 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7661 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7662 // target-specific builtins, perhaps? 7663 if (!FD->getAttr<FormatAttr>()) 7664 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7665 "printf", 2, 7666 Name->isStr("vasprintf") ? 0 : 3)); 7667 } 7668} 7669 7670TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7671 TypeSourceInfo *TInfo) { 7672 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7673 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7674 7675 if (!TInfo) { 7676 assert(D.isInvalidType() && "no declarator info for valid type"); 7677 TInfo = Context.getTrivialTypeSourceInfo(T); 7678 } 7679 7680 // Scope manipulation handled by caller. 7681 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7682 D.getLocStart(), 7683 D.getIdentifierLoc(), 7684 D.getIdentifier(), 7685 TInfo); 7686 7687 // Bail out immediately if we have an invalid declaration. 7688 if (D.isInvalidType()) { 7689 NewTD->setInvalidDecl(); 7690 return NewTD; 7691 } 7692 7693 if (D.getDeclSpec().isModulePrivateSpecified()) { 7694 if (CurContext->isFunctionOrMethod()) 7695 Diag(NewTD->getLocation(), diag::err_module_private_local) 7696 << 2 << NewTD->getDeclName() 7697 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7698 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7699 else 7700 NewTD->setModulePrivate(); 7701 } 7702 7703 // C++ [dcl.typedef]p8: 7704 // If the typedef declaration defines an unnamed class (or 7705 // enum), the first typedef-name declared by the declaration 7706 // to be that class type (or enum type) is used to denote the 7707 // class type (or enum type) for linkage purposes only. 7708 // We need to check whether the type was declared in the declaration. 7709 switch (D.getDeclSpec().getTypeSpecType()) { 7710 case TST_enum: 7711 case TST_struct: 7712 case TST_union: 7713 case TST_class: { 7714 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7715 7716 // Do nothing if the tag is not anonymous or already has an 7717 // associated typedef (from an earlier typedef in this decl group). 7718 if (tagFromDeclSpec->getIdentifier()) break; 7719 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7720 7721 // A well-formed anonymous tag must always be a TUK_Definition. 7722 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7723 7724 // The type must match the tag exactly; no qualifiers allowed. 7725 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7726 break; 7727 7728 // Otherwise, set this is the anon-decl typedef for the tag. 7729 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7730 break; 7731 } 7732 7733 default: 7734 break; 7735 } 7736 7737 return NewTD; 7738} 7739 7740 7741/// \brief Determine whether a tag with a given kind is acceptable 7742/// as a redeclaration of the given tag declaration. 7743/// 7744/// \returns true if the new tag kind is acceptable, false otherwise. 7745bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7746 TagTypeKind NewTag, bool isDefinition, 7747 SourceLocation NewTagLoc, 7748 const IdentifierInfo &Name) { 7749 // C++ [dcl.type.elab]p3: 7750 // The class-key or enum keyword present in the 7751 // elaborated-type-specifier shall agree in kind with the 7752 // declaration to which the name in the elaborated-type-specifier 7753 // refers. This rule also applies to the form of 7754 // elaborated-type-specifier that declares a class-name or 7755 // friend class since it can be construed as referring to the 7756 // definition of the class. Thus, in any 7757 // elaborated-type-specifier, the enum keyword shall be used to 7758 // refer to an enumeration (7.2), the union class-key shall be 7759 // used to refer to a union (clause 9), and either the class or 7760 // struct class-key shall be used to refer to a class (clause 9) 7761 // declared using the class or struct class-key. 7762 TagTypeKind OldTag = Previous->getTagKind(); 7763 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7764 if (OldTag == NewTag) 7765 return true; 7766 7767 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7768 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7769 // Warn about the struct/class tag mismatch. 7770 bool isTemplate = false; 7771 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7772 isTemplate = Record->getDescribedClassTemplate(); 7773 7774 if (!ActiveTemplateInstantiations.empty()) { 7775 // In a template instantiation, do not offer fix-its for tag mismatches 7776 // since they usually mess up the template instead of fixing the problem. 7777 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7778 << (NewTag == TTK_Class) << isTemplate << &Name; 7779 return true; 7780 } 7781 7782 if (isDefinition) { 7783 // On definitions, check previous tags and issue a fix-it for each 7784 // one that doesn't match the current tag. 7785 if (Previous->getDefinition()) { 7786 // Don't suggest fix-its for redefinitions. 7787 return true; 7788 } 7789 7790 bool previousMismatch = false; 7791 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7792 E(Previous->redecls_end()); I != E; ++I) { 7793 if (I->getTagKind() != NewTag) { 7794 if (!previousMismatch) { 7795 previousMismatch = true; 7796 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7797 << (NewTag == TTK_Class) << isTemplate << &Name; 7798 } 7799 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7800 << (NewTag == TTK_Class) 7801 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7802 NewTag == TTK_Class? 7803 "class" : "struct"); 7804 } 7805 } 7806 return true; 7807 } 7808 7809 // Check for a previous definition. If current tag and definition 7810 // are same type, do nothing. If no definition, but disagree with 7811 // with previous tag type, give a warning, but no fix-it. 7812 const TagDecl *Redecl = Previous->getDefinition() ? 7813 Previous->getDefinition() : Previous; 7814 if (Redecl->getTagKind() == NewTag) { 7815 return true; 7816 } 7817 7818 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7819 << (NewTag == TTK_Class) 7820 << isTemplate << &Name; 7821 Diag(Redecl->getLocation(), diag::note_previous_use); 7822 7823 // If there is a previous defintion, suggest a fix-it. 7824 if (Previous->getDefinition()) { 7825 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7826 << (Redecl->getTagKind() == TTK_Class) 7827 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7828 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7829 } 7830 7831 return true; 7832 } 7833 return false; 7834} 7835 7836/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7837/// former case, Name will be non-null. In the later case, Name will be null. 7838/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7839/// reference/declaration/definition of a tag. 7840Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7841 SourceLocation KWLoc, CXXScopeSpec &SS, 7842 IdentifierInfo *Name, SourceLocation NameLoc, 7843 AttributeList *Attr, AccessSpecifier AS, 7844 SourceLocation ModulePrivateLoc, 7845 MultiTemplateParamsArg TemplateParameterLists, 7846 bool &OwnedDecl, bool &IsDependent, 7847 SourceLocation ScopedEnumKWLoc, 7848 bool ScopedEnumUsesClassTag, 7849 TypeResult UnderlyingType) { 7850 // If this is not a definition, it must have a name. 7851 assert((Name != 0 || TUK == TUK_Definition) && 7852 "Nameless record must be a definition!"); 7853 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7854 7855 OwnedDecl = false; 7856 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7857 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 7858 7859 // FIXME: Check explicit specializations more carefully. 7860 bool isExplicitSpecialization = false; 7861 bool Invalid = false; 7862 7863 // We only need to do this matching if we have template parameters 7864 // or a scope specifier, which also conveniently avoids this work 7865 // for non-C++ cases. 7866 if (TemplateParameterLists.size() > 0 || 7867 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7868 if (TemplateParameterList *TemplateParams 7869 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7870 TemplateParameterLists.get(), 7871 TemplateParameterLists.size(), 7872 TUK == TUK_Friend, 7873 isExplicitSpecialization, 7874 Invalid)) { 7875 if (TemplateParams->size() > 0) { 7876 // This is a declaration or definition of a class template (which may 7877 // be a member of another template). 7878 7879 if (Invalid) 7880 return 0; 7881 7882 OwnedDecl = false; 7883 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7884 SS, Name, NameLoc, Attr, 7885 TemplateParams, AS, 7886 ModulePrivateLoc, 7887 TemplateParameterLists.size() - 1, 7888 (TemplateParameterList**) TemplateParameterLists.release()); 7889 return Result.get(); 7890 } else { 7891 // The "template<>" header is extraneous. 7892 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7893 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7894 isExplicitSpecialization = true; 7895 } 7896 } 7897 } 7898 7899 // Figure out the underlying type if this a enum declaration. We need to do 7900 // this early, because it's needed to detect if this is an incompatible 7901 // redeclaration. 7902 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7903 7904 if (Kind == TTK_Enum) { 7905 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7906 // No underlying type explicitly specified, or we failed to parse the 7907 // type, default to int. 7908 EnumUnderlying = Context.IntTy.getTypePtr(); 7909 else if (UnderlyingType.get()) { 7910 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7911 // integral type; any cv-qualification is ignored. 7912 TypeSourceInfo *TI = 0; 7913 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7914 EnumUnderlying = TI; 7915 7916 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7917 7918 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7919 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7920 << T; 7921 // Recover by falling back to int. 7922 EnumUnderlying = Context.IntTy.getTypePtr(); 7923 } 7924 7925 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7926 UPPC_FixedUnderlyingType)) 7927 EnumUnderlying = Context.IntTy.getTypePtr(); 7928 7929 } else if (getLangOpts().MicrosoftMode) 7930 // Microsoft enums are always of int type. 7931 EnumUnderlying = Context.IntTy.getTypePtr(); 7932 } 7933 7934 DeclContext *SearchDC = CurContext; 7935 DeclContext *DC = CurContext; 7936 bool isStdBadAlloc = false; 7937 7938 RedeclarationKind Redecl = ForRedeclaration; 7939 if (TUK == TUK_Friend || TUK == TUK_Reference) 7940 Redecl = NotForRedeclaration; 7941 7942 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7943 7944 if (Name && SS.isNotEmpty()) { 7945 // We have a nested-name tag ('struct foo::bar'). 7946 7947 // Check for invalid 'foo::'. 7948 if (SS.isInvalid()) { 7949 Name = 0; 7950 goto CreateNewDecl; 7951 } 7952 7953 // If this is a friend or a reference to a class in a dependent 7954 // context, don't try to make a decl for it. 7955 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7956 DC = computeDeclContext(SS, false); 7957 if (!DC) { 7958 IsDependent = true; 7959 return 0; 7960 } 7961 } else { 7962 DC = computeDeclContext(SS, true); 7963 if (!DC) { 7964 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7965 << SS.getRange(); 7966 return 0; 7967 } 7968 } 7969 7970 if (RequireCompleteDeclContext(SS, DC)) 7971 return 0; 7972 7973 SearchDC = DC; 7974 // Look-up name inside 'foo::'. 7975 LookupQualifiedName(Previous, DC); 7976 7977 if (Previous.isAmbiguous()) 7978 return 0; 7979 7980 if (Previous.empty()) { 7981 // Name lookup did not find anything. However, if the 7982 // nested-name-specifier refers to the current instantiation, 7983 // and that current instantiation has any dependent base 7984 // classes, we might find something at instantiation time: treat 7985 // this as a dependent elaborated-type-specifier. 7986 // But this only makes any sense for reference-like lookups. 7987 if (Previous.wasNotFoundInCurrentInstantiation() && 7988 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7989 IsDependent = true; 7990 return 0; 7991 } 7992 7993 // A tag 'foo::bar' must already exist. 7994 Diag(NameLoc, diag::err_not_tag_in_scope) 7995 << Kind << Name << DC << SS.getRange(); 7996 Name = 0; 7997 Invalid = true; 7998 goto CreateNewDecl; 7999 } 8000 } else if (Name) { 8001 // If this is a named struct, check to see if there was a previous forward 8002 // declaration or definition. 8003 // FIXME: We're looking into outer scopes here, even when we 8004 // shouldn't be. Doing so can result in ambiguities that we 8005 // shouldn't be diagnosing. 8006 LookupName(Previous, S); 8007 8008 if (Previous.isAmbiguous() && 8009 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 8010 LookupResult::Filter F = Previous.makeFilter(); 8011 while (F.hasNext()) { 8012 NamedDecl *ND = F.next(); 8013 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 8014 F.erase(); 8015 } 8016 F.done(); 8017 } 8018 8019 // Note: there used to be some attempt at recovery here. 8020 if (Previous.isAmbiguous()) 8021 return 0; 8022 8023 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) { 8024 // FIXME: This makes sure that we ignore the contexts associated 8025 // with C structs, unions, and enums when looking for a matching 8026 // tag declaration or definition. See the similar lookup tweak 8027 // in Sema::LookupName; is there a better way to deal with this? 8028 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 8029 SearchDC = SearchDC->getParent(); 8030 } 8031 } else if (S->isFunctionPrototypeScope()) { 8032 // If this is an enum declaration in function prototype scope, set its 8033 // initial context to the translation unit. 8034 // FIXME: [citation needed] 8035 SearchDC = Context.getTranslationUnitDecl(); 8036 } 8037 8038 if (Previous.isSingleResult() && 8039 Previous.getFoundDecl()->isTemplateParameter()) { 8040 // Maybe we will complain about the shadowed template parameter. 8041 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 8042 // Just pretend that we didn't see the previous declaration. 8043 Previous.clear(); 8044 } 8045 8046 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace && 8047 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 8048 // This is a declaration of or a reference to "std::bad_alloc". 8049 isStdBadAlloc = true; 8050 8051 if (Previous.empty() && StdBadAlloc) { 8052 // std::bad_alloc has been implicitly declared (but made invisible to 8053 // name lookup). Fill in this implicit declaration as the previous 8054 // declaration, so that the declarations get chained appropriately. 8055 Previous.addDecl(getStdBadAlloc()); 8056 } 8057 } 8058 8059 // If we didn't find a previous declaration, and this is a reference 8060 // (or friend reference), move to the correct scope. In C++, we 8061 // also need to do a redeclaration lookup there, just in case 8062 // there's a shadow friend decl. 8063 if (Name && Previous.empty() && 8064 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8065 if (Invalid) goto CreateNewDecl; 8066 assert(SS.isEmpty()); 8067 8068 if (TUK == TUK_Reference) { 8069 // C++ [basic.scope.pdecl]p5: 8070 // -- for an elaborated-type-specifier of the form 8071 // 8072 // class-key identifier 8073 // 8074 // if the elaborated-type-specifier is used in the 8075 // decl-specifier-seq or parameter-declaration-clause of a 8076 // function defined in namespace scope, the identifier is 8077 // declared as a class-name in the namespace that contains 8078 // the declaration; otherwise, except as a friend 8079 // declaration, the identifier is declared in the smallest 8080 // non-class, non-function-prototype scope that contains the 8081 // declaration. 8082 // 8083 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 8084 // C structs and unions. 8085 // 8086 // It is an error in C++ to declare (rather than define) an enum 8087 // type, including via an elaborated type specifier. We'll 8088 // diagnose that later; for now, declare the enum in the same 8089 // scope as we would have picked for any other tag type. 8090 // 8091 // GNU C also supports this behavior as part of its incomplete 8092 // enum types extension, while GNU C++ does not. 8093 // 8094 // Find the context where we'll be declaring the tag. 8095 // FIXME: We would like to maintain the current DeclContext as the 8096 // lexical context, 8097 while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod()) 8098 SearchDC = SearchDC->getParent(); 8099 8100 // Find the scope where we'll be declaring the tag. 8101 while (S->isClassScope() || 8102 (getLangOpts().CPlusPlus && 8103 S->isFunctionPrototypeScope()) || 8104 ((S->getFlags() & Scope::DeclScope) == 0) || 8105 (S->getEntity() && 8106 ((DeclContext *)S->getEntity())->isTransparentContext())) 8107 S = S->getParent(); 8108 } else { 8109 assert(TUK == TUK_Friend); 8110 // C++ [namespace.memdef]p3: 8111 // If a friend declaration in a non-local class first declares a 8112 // class or function, the friend class or function is a member of 8113 // the innermost enclosing namespace. 8114 SearchDC = SearchDC->getEnclosingNamespaceContext(); 8115 } 8116 8117 // In C++, we need to do a redeclaration lookup to properly 8118 // diagnose some problems. 8119 if (getLangOpts().CPlusPlus) { 8120 Previous.setRedeclarationKind(ForRedeclaration); 8121 LookupQualifiedName(Previous, SearchDC); 8122 } 8123 } 8124 8125 if (!Previous.empty()) { 8126 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 8127 8128 // It's okay to have a tag decl in the same scope as a typedef 8129 // which hides a tag decl in the same scope. Finding this 8130 // insanity with a redeclaration lookup can only actually happen 8131 // in C++. 8132 // 8133 // This is also okay for elaborated-type-specifiers, which is 8134 // technically forbidden by the current standard but which is 8135 // okay according to the likely resolution of an open issue; 8136 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 8137 if (getLangOpts().CPlusPlus) { 8138 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8139 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 8140 TagDecl *Tag = TT->getDecl(); 8141 if (Tag->getDeclName() == Name && 8142 Tag->getDeclContext()->getRedeclContext() 8143 ->Equals(TD->getDeclContext()->getRedeclContext())) { 8144 PrevDecl = Tag; 8145 Previous.clear(); 8146 Previous.addDecl(Tag); 8147 Previous.resolveKind(); 8148 } 8149 } 8150 } 8151 } 8152 8153 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 8154 // If this is a use of a previous tag, or if the tag is already declared 8155 // in the same scope (so that the definition/declaration completes or 8156 // rementions the tag), reuse the decl. 8157 if (TUK == TUK_Reference || TUK == TUK_Friend || 8158 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 8159 // Make sure that this wasn't declared as an enum and now used as a 8160 // struct or something similar. 8161 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 8162 TUK == TUK_Definition, KWLoc, 8163 *Name)) { 8164 bool SafeToContinue 8165 = (PrevTagDecl->getTagKind() != TTK_Enum && 8166 Kind != TTK_Enum); 8167 if (SafeToContinue) 8168 Diag(KWLoc, diag::err_use_with_wrong_tag) 8169 << Name 8170 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8171 PrevTagDecl->getKindName()); 8172 else 8173 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8174 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8175 8176 if (SafeToContinue) 8177 Kind = PrevTagDecl->getTagKind(); 8178 else { 8179 // Recover by making this an anonymous redefinition. 8180 Name = 0; 8181 Previous.clear(); 8182 Invalid = true; 8183 } 8184 } 8185 8186 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8187 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8188 8189 // If this is an elaborated-type-specifier for a scoped enumeration, 8190 // the 'class' keyword is not necessary and not permitted. 8191 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8192 if (ScopedEnum) 8193 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8194 << PrevEnum->isScoped() 8195 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8196 return PrevTagDecl; 8197 } 8198 8199 // All conflicts with previous declarations are recovered by 8200 // returning the previous declaration. 8201 if (ScopedEnum != PrevEnum->isScoped()) { 8202 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 8203 << PrevEnum->isScoped(); 8204 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8205 return PrevTagDecl; 8206 } 8207 else if (EnumUnderlying && PrevEnum->isFixed()) { 8208 QualType T; 8209 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8210 T = TI->getType(); 8211 else 8212 T = QualType(EnumUnderlying.get<const Type*>(), 0); 8213 8214 if (!Context.hasSameUnqualifiedType(T, 8215 PrevEnum->getIntegerType())) { 8216 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 8217 diag::err_enum_redeclare_type_mismatch) 8218 << T 8219 << PrevEnum->getIntegerType(); 8220 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8221 return PrevTagDecl; 8222 } 8223 } 8224 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 8225 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 8226 << PrevEnum->isFixed(); 8227 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8228 return PrevTagDecl; 8229 } 8230 } 8231 8232 if (!Invalid) { 8233 // If this is a use, just return the declaration we found. 8234 8235 // FIXME: In the future, return a variant or some other clue 8236 // for the consumer of this Decl to know it doesn't own it. 8237 // For our current ASTs this shouldn't be a problem, but will 8238 // need to be changed with DeclGroups. 8239 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8240 getLangOpts().MicrosoftExt)) || TUK == TUK_Friend) 8241 return PrevTagDecl; 8242 8243 // Diagnose attempts to redefine a tag. 8244 if (TUK == TUK_Definition) { 8245 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8246 // If we're defining a specialization and the previous definition 8247 // is from an implicit instantiation, don't emit an error 8248 // here; we'll catch this in the general case below. 8249 if (!isExplicitSpecialization || 8250 !isa<CXXRecordDecl>(Def) || 8251 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 8252 == TSK_ExplicitSpecialization) { 8253 // A redeclaration in function prototype scope in C isn't 8254 // visible elsewhere, so merely issue a warning. 8255 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope()) 8256 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name; 8257 else 8258 Diag(NameLoc, diag::err_redefinition) << Name; 8259 Diag(Def->getLocation(), diag::note_previous_definition); 8260 // If this is a redefinition, recover by making this 8261 // struct be anonymous, which will make any later 8262 // references get the previous definition. 8263 Name = 0; 8264 Previous.clear(); 8265 Invalid = true; 8266 } 8267 } else { 8268 // If the type is currently being defined, complain 8269 // about a nested redefinition. 8270 const TagType *Tag 8271 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8272 if (Tag->isBeingDefined()) { 8273 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8274 Diag(PrevTagDecl->getLocation(), 8275 diag::note_previous_definition); 8276 Name = 0; 8277 Previous.clear(); 8278 Invalid = true; 8279 } 8280 } 8281 8282 // Okay, this is definition of a previously declared or referenced 8283 // tag PrevDecl. We're going to create a new Decl for it. 8284 } 8285 } 8286 // If we get here we have (another) forward declaration or we 8287 // have a definition. Just create a new decl. 8288 8289 } else { 8290 // If we get here, this is a definition of a new tag type in a nested 8291 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8292 // new decl/type. We set PrevDecl to NULL so that the entities 8293 // have distinct types. 8294 Previous.clear(); 8295 } 8296 // If we get here, we're going to create a new Decl. If PrevDecl 8297 // is non-NULL, it's a definition of the tag declared by 8298 // PrevDecl. If it's NULL, we have a new definition. 8299 8300 8301 // Otherwise, PrevDecl is not a tag, but was found with tag 8302 // lookup. This is only actually possible in C++, where a few 8303 // things like templates still live in the tag namespace. 8304 } else { 8305 // Use a better diagnostic if an elaborated-type-specifier 8306 // found the wrong kind of type on the first 8307 // (non-redeclaration) lookup. 8308 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8309 !Previous.isForRedeclaration()) { 8310 unsigned Kind = 0; 8311 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8312 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8313 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8314 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8315 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8316 Invalid = true; 8317 8318 // Otherwise, only diagnose if the declaration is in scope. 8319 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8320 isExplicitSpecialization)) { 8321 // do nothing 8322 8323 // Diagnose implicit declarations introduced by elaborated types. 8324 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8325 unsigned Kind = 0; 8326 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8327 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8328 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8329 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8330 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8331 Invalid = true; 8332 8333 // Otherwise it's a declaration. Call out a particularly common 8334 // case here. 8335 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8336 unsigned Kind = 0; 8337 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8338 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8339 << Name << Kind << TND->getUnderlyingType(); 8340 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8341 Invalid = true; 8342 8343 // Otherwise, diagnose. 8344 } else { 8345 // The tag name clashes with something else in the target scope, 8346 // issue an error and recover by making this tag be anonymous. 8347 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8348 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8349 Name = 0; 8350 Invalid = true; 8351 } 8352 8353 // The existing declaration isn't relevant to us; we're in a 8354 // new scope, so clear out the previous declaration. 8355 Previous.clear(); 8356 } 8357 } 8358 8359CreateNewDecl: 8360 8361 TagDecl *PrevDecl = 0; 8362 if (Previous.isSingleResult()) 8363 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8364 8365 // If there is an identifier, use the location of the identifier as the 8366 // location of the decl, otherwise use the location of the struct/union 8367 // keyword. 8368 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8369 8370 // Otherwise, create a new declaration. If there is a previous 8371 // declaration of the same entity, the two will be linked via 8372 // PrevDecl. 8373 TagDecl *New; 8374 8375 bool IsForwardReference = false; 8376 if (Kind == TTK_Enum) { 8377 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8378 // enum X { A, B, C } D; D should chain to X. 8379 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8380 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8381 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8382 // If this is an undefined enum, warn. 8383 if (TUK != TUK_Definition && !Invalid) { 8384 TagDecl *Def; 8385 if (getLangOpts().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8386 // C++0x: 7.2p2: opaque-enum-declaration. 8387 // Conflicts are diagnosed above. Do nothing. 8388 } 8389 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8390 Diag(Loc, diag::ext_forward_ref_enum_def) 8391 << New; 8392 Diag(Def->getLocation(), diag::note_previous_definition); 8393 } else { 8394 unsigned DiagID = diag::ext_forward_ref_enum; 8395 if (getLangOpts().MicrosoftMode) 8396 DiagID = diag::ext_ms_forward_ref_enum; 8397 else if (getLangOpts().CPlusPlus) 8398 DiagID = diag::err_forward_ref_enum; 8399 Diag(Loc, DiagID); 8400 8401 // If this is a forward-declared reference to an enumeration, make a 8402 // note of it; we won't actually be introducing the declaration into 8403 // the declaration context. 8404 if (TUK == TUK_Reference) 8405 IsForwardReference = true; 8406 } 8407 } 8408 8409 if (EnumUnderlying) { 8410 EnumDecl *ED = cast<EnumDecl>(New); 8411 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8412 ED->setIntegerTypeSourceInfo(TI); 8413 else 8414 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8415 ED->setPromotionType(ED->getIntegerType()); 8416 } 8417 8418 } else { 8419 // struct/union/class 8420 8421 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8422 // struct X { int A; } D; D should chain to X. 8423 if (getLangOpts().CPlusPlus) { 8424 // FIXME: Look for a way to use RecordDecl for simple structs. 8425 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8426 cast_or_null<CXXRecordDecl>(PrevDecl)); 8427 8428 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8429 StdBadAlloc = cast<CXXRecordDecl>(New); 8430 } else 8431 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8432 cast_or_null<RecordDecl>(PrevDecl)); 8433 } 8434 8435 // Maybe add qualifier info. 8436 if (SS.isNotEmpty()) { 8437 if (SS.isSet()) { 8438 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8439 if (TemplateParameterLists.size() > 0) { 8440 New->setTemplateParameterListsInfo(Context, 8441 TemplateParameterLists.size(), 8442 (TemplateParameterList**) TemplateParameterLists.release()); 8443 } 8444 } 8445 else 8446 Invalid = true; 8447 } 8448 8449 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8450 // Add alignment attributes if necessary; these attributes are checked when 8451 // the ASTContext lays out the structure. 8452 // 8453 // It is important for implementing the correct semantics that this 8454 // happen here (in act on tag decl). The #pragma pack stack is 8455 // maintained as a result of parser callbacks which can occur at 8456 // many points during the parsing of a struct declaration (because 8457 // the #pragma tokens are effectively skipped over during the 8458 // parsing of the struct). 8459 AddAlignmentAttributesForRecord(RD); 8460 8461 AddMsStructLayoutForRecord(RD); 8462 } 8463 8464 if (ModulePrivateLoc.isValid()) { 8465 if (isExplicitSpecialization) 8466 Diag(New->getLocation(), diag::err_module_private_specialization) 8467 << 2 8468 << FixItHint::CreateRemoval(ModulePrivateLoc); 8469 // __module_private__ does not apply to local classes. However, we only 8470 // diagnose this as an error when the declaration specifiers are 8471 // freestanding. Here, we just ignore the __module_private__. 8472 else if (!SearchDC->isFunctionOrMethod()) 8473 New->setModulePrivate(); 8474 } 8475 8476 // If this is a specialization of a member class (of a class template), 8477 // check the specialization. 8478 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8479 Invalid = true; 8480 8481 if (Invalid) 8482 New->setInvalidDecl(); 8483 8484 if (Attr) 8485 ProcessDeclAttributeList(S, New, Attr); 8486 8487 // If we're declaring or defining a tag in function prototype scope 8488 // in C, note that this type can only be used within the function. 8489 if (Name && S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus) 8490 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8491 8492 // Set the lexical context. If the tag has a C++ scope specifier, the 8493 // lexical context will be different from the semantic context. 8494 New->setLexicalDeclContext(CurContext); 8495 8496 // Mark this as a friend decl if applicable. 8497 // In Microsoft mode, a friend declaration also acts as a forward 8498 // declaration so we always pass true to setObjectOfFriendDecl to make 8499 // the tag name visible. 8500 if (TUK == TUK_Friend) 8501 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8502 getLangOpts().MicrosoftExt); 8503 8504 // Set the access specifier. 8505 if (!Invalid && SearchDC->isRecord()) 8506 SetMemberAccessSpecifier(New, PrevDecl, AS); 8507 8508 if (TUK == TUK_Definition) 8509 New->startDefinition(); 8510 8511 // If this has an identifier, add it to the scope stack. 8512 if (TUK == TUK_Friend) { 8513 // We might be replacing an existing declaration in the lookup tables; 8514 // if so, borrow its access specifier. 8515 if (PrevDecl) 8516 New->setAccess(PrevDecl->getAccess()); 8517 8518 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8519 DC->makeDeclVisibleInContext(New); 8520 if (Name) // can be null along some error paths 8521 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8522 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8523 } else if (Name) { 8524 S = getNonFieldDeclScope(S); 8525 PushOnScopeChains(New, S, !IsForwardReference); 8526 if (IsForwardReference) 8527 SearchDC->makeDeclVisibleInContext(New); 8528 8529 } else { 8530 CurContext->addDecl(New); 8531 } 8532 8533 // If this is the C FILE type, notify the AST context. 8534 if (IdentifierInfo *II = New->getIdentifier()) 8535 if (!New->isInvalidDecl() && 8536 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8537 II->isStr("FILE")) 8538 Context.setFILEDecl(New); 8539 8540 // If we were in function prototype scope (and not in C++ mode), add this 8541 // tag to the list of decls to inject into the function definition scope. 8542 if (S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus && 8543 InFunctionDeclarator && Name) 8544 DeclsInPrototypeScope.push_back(New); 8545 8546 OwnedDecl = true; 8547 return New; 8548} 8549 8550void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8551 AdjustDeclIfTemplate(TagD); 8552 TagDecl *Tag = cast<TagDecl>(TagD); 8553 8554 // Enter the tag context. 8555 PushDeclContext(S, Tag); 8556} 8557 8558Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8559 assert(isa<ObjCContainerDecl>(IDecl) && 8560 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8561 DeclContext *OCD = cast<DeclContext>(IDecl); 8562 assert(getContainingDC(OCD) == CurContext && 8563 "The next DeclContext should be lexically contained in the current one."); 8564 CurContext = OCD; 8565 return IDecl; 8566} 8567 8568void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8569 SourceLocation FinalLoc, 8570 SourceLocation LBraceLoc) { 8571 AdjustDeclIfTemplate(TagD); 8572 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8573 8574 FieldCollector->StartClass(); 8575 8576 if (!Record->getIdentifier()) 8577 return; 8578 8579 if (FinalLoc.isValid()) 8580 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8581 8582 // C++ [class]p2: 8583 // [...] The class-name is also inserted into the scope of the 8584 // class itself; this is known as the injected-class-name. For 8585 // purposes of access checking, the injected-class-name is treated 8586 // as if it were a public member name. 8587 CXXRecordDecl *InjectedClassName 8588 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8589 Record->getLocStart(), Record->getLocation(), 8590 Record->getIdentifier(), 8591 /*PrevDecl=*/0, 8592 /*DelayTypeCreation=*/true); 8593 Context.getTypeDeclType(InjectedClassName, Record); 8594 InjectedClassName->setImplicit(); 8595 InjectedClassName->setAccess(AS_public); 8596 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8597 InjectedClassName->setDescribedClassTemplate(Template); 8598 PushOnScopeChains(InjectedClassName, S); 8599 assert(InjectedClassName->isInjectedClassName() && 8600 "Broken injected-class-name"); 8601} 8602 8603void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8604 SourceLocation RBraceLoc) { 8605 AdjustDeclIfTemplate(TagD); 8606 TagDecl *Tag = cast<TagDecl>(TagD); 8607 Tag->setRBraceLoc(RBraceLoc); 8608 8609 // Make sure we "complete" the definition even it is invalid. 8610 if (Tag->isBeingDefined()) { 8611 assert(Tag->isInvalidDecl() && "We should already have completed it"); 8612 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 8613 RD->completeDefinition(); 8614 } 8615 8616 if (isa<CXXRecordDecl>(Tag)) 8617 FieldCollector->FinishClass(); 8618 8619 // Exit this scope of this tag's definition. 8620 PopDeclContext(); 8621 8622 // Notify the consumer that we've defined a tag. 8623 Consumer.HandleTagDeclDefinition(Tag); 8624} 8625 8626void Sema::ActOnObjCContainerFinishDefinition() { 8627 // Exit this scope of this interface definition. 8628 PopDeclContext(); 8629} 8630 8631void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8632 assert(DC == CurContext && "Mismatch of container contexts"); 8633 OriginalLexicalContext = DC; 8634 ActOnObjCContainerFinishDefinition(); 8635} 8636 8637void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8638 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8639 OriginalLexicalContext = 0; 8640} 8641 8642void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8643 AdjustDeclIfTemplate(TagD); 8644 TagDecl *Tag = cast<TagDecl>(TagD); 8645 Tag->setInvalidDecl(); 8646 8647 // Make sure we "complete" the definition even it is invalid. 8648 if (Tag->isBeingDefined()) { 8649 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 8650 RD->completeDefinition(); 8651 } 8652 8653 // We're undoing ActOnTagStartDefinition here, not 8654 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8655 // the FieldCollector. 8656 8657 PopDeclContext(); 8658} 8659 8660// Note that FieldName may be null for anonymous bitfields. 8661ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 8662 IdentifierInfo *FieldName, 8663 QualType FieldTy, Expr *BitWidth, 8664 bool *ZeroWidth) { 8665 // Default to true; that shouldn't confuse checks for emptiness 8666 if (ZeroWidth) 8667 *ZeroWidth = true; 8668 8669 // C99 6.7.2.1p4 - verify the field type. 8670 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8671 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8672 // Handle incomplete types with specific error. 8673 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8674 return ExprError(); 8675 if (FieldName) 8676 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8677 << FieldName << FieldTy << BitWidth->getSourceRange(); 8678 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8679 << FieldTy << BitWidth->getSourceRange(); 8680 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8681 UPPC_BitFieldWidth)) 8682 return ExprError(); 8683 8684 // If the bit-width is type- or value-dependent, don't try to check 8685 // it now. 8686 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8687 return Owned(BitWidth); 8688 8689 llvm::APSInt Value; 8690 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 8691 if (ICE.isInvalid()) 8692 return ICE; 8693 BitWidth = ICE.take(); 8694 8695 if (Value != 0 && ZeroWidth) 8696 *ZeroWidth = false; 8697 8698 // Zero-width bitfield is ok for anonymous field. 8699 if (Value == 0 && FieldName) 8700 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8701 8702 if (Value.isSigned() && Value.isNegative()) { 8703 if (FieldName) 8704 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8705 << FieldName << Value.toString(10); 8706 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8707 << Value.toString(10); 8708 } 8709 8710 if (!FieldTy->isDependentType()) { 8711 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8712 if (Value.getZExtValue() > TypeSize) { 8713 if (!getLangOpts().CPlusPlus) { 8714 if (FieldName) 8715 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8716 << FieldName << (unsigned)Value.getZExtValue() 8717 << (unsigned)TypeSize; 8718 8719 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8720 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8721 } 8722 8723 if (FieldName) 8724 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8725 << FieldName << (unsigned)Value.getZExtValue() 8726 << (unsigned)TypeSize; 8727 else 8728 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8729 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8730 } 8731 } 8732 8733 return Owned(BitWidth); 8734} 8735 8736/// ActOnField - Each field of a C struct/union is passed into this in order 8737/// to create a FieldDecl object for it. 8738Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8739 Declarator &D, Expr *BitfieldWidth) { 8740 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8741 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8742 /*HasInit=*/false, AS_public); 8743 return Res; 8744} 8745 8746/// HandleField - Analyze a field of a C struct or a C++ data member. 8747/// 8748FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8749 SourceLocation DeclStart, 8750 Declarator &D, Expr *BitWidth, bool HasInit, 8751 AccessSpecifier AS) { 8752 IdentifierInfo *II = D.getIdentifier(); 8753 SourceLocation Loc = DeclStart; 8754 if (II) Loc = D.getIdentifierLoc(); 8755 8756 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8757 QualType T = TInfo->getType(); 8758 if (getLangOpts().CPlusPlus) { 8759 CheckExtraCXXDefaultArguments(D); 8760 8761 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8762 UPPC_DataMemberType)) { 8763 D.setInvalidType(); 8764 T = Context.IntTy; 8765 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8766 } 8767 } 8768 8769 DiagnoseFunctionSpecifiers(D); 8770 8771 if (D.getDeclSpec().isThreadSpecified()) 8772 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8773 if (D.getDeclSpec().isConstexprSpecified()) 8774 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8775 << 2; 8776 8777 // Check to see if this name was declared as a member previously 8778 NamedDecl *PrevDecl = 0; 8779 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8780 LookupName(Previous, S); 8781 switch (Previous.getResultKind()) { 8782 case LookupResult::Found: 8783 case LookupResult::FoundUnresolvedValue: 8784 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8785 break; 8786 8787 case LookupResult::FoundOverloaded: 8788 PrevDecl = Previous.getRepresentativeDecl(); 8789 break; 8790 8791 case LookupResult::NotFound: 8792 case LookupResult::NotFoundInCurrentInstantiation: 8793 case LookupResult::Ambiguous: 8794 break; 8795 } 8796 Previous.suppressDiagnostics(); 8797 8798 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8799 // Maybe we will complain about the shadowed template parameter. 8800 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8801 // Just pretend that we didn't see the previous declaration. 8802 PrevDecl = 0; 8803 } 8804 8805 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8806 PrevDecl = 0; 8807 8808 bool Mutable 8809 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8810 SourceLocation TSSL = D.getLocStart(); 8811 FieldDecl *NewFD 8812 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8813 TSSL, AS, PrevDecl, &D); 8814 8815 if (NewFD->isInvalidDecl()) 8816 Record->setInvalidDecl(); 8817 8818 if (D.getDeclSpec().isModulePrivateSpecified()) 8819 NewFD->setModulePrivate(); 8820 8821 if (NewFD->isInvalidDecl() && PrevDecl) { 8822 // Don't introduce NewFD into scope; there's already something 8823 // with the same name in the same scope. 8824 } else if (II) { 8825 PushOnScopeChains(NewFD, S); 8826 } else 8827 Record->addDecl(NewFD); 8828 8829 return NewFD; 8830} 8831 8832/// \brief Build a new FieldDecl and check its well-formedness. 8833/// 8834/// This routine builds a new FieldDecl given the fields name, type, 8835/// record, etc. \p PrevDecl should refer to any previous declaration 8836/// with the same name and in the same scope as the field to be 8837/// created. 8838/// 8839/// \returns a new FieldDecl. 8840/// 8841/// \todo The Declarator argument is a hack. It will be removed once 8842FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8843 TypeSourceInfo *TInfo, 8844 RecordDecl *Record, SourceLocation Loc, 8845 bool Mutable, Expr *BitWidth, bool HasInit, 8846 SourceLocation TSSL, 8847 AccessSpecifier AS, NamedDecl *PrevDecl, 8848 Declarator *D) { 8849 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8850 bool InvalidDecl = false; 8851 if (D) InvalidDecl = D->isInvalidType(); 8852 8853 // If we receive a broken type, recover by assuming 'int' and 8854 // marking this declaration as invalid. 8855 if (T.isNull()) { 8856 InvalidDecl = true; 8857 T = Context.IntTy; 8858 } 8859 8860 QualType EltTy = Context.getBaseElementType(T); 8861 if (!EltTy->isDependentType()) { 8862 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8863 // Fields of incomplete type force their record to be invalid. 8864 Record->setInvalidDecl(); 8865 InvalidDecl = true; 8866 } else { 8867 NamedDecl *Def; 8868 EltTy->isIncompleteType(&Def); 8869 if (Def && Def->isInvalidDecl()) { 8870 Record->setInvalidDecl(); 8871 InvalidDecl = true; 8872 } 8873 } 8874 } 8875 8876 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8877 // than a variably modified type. 8878 if (!InvalidDecl && T->isVariablyModifiedType()) { 8879 bool SizeIsNegative; 8880 llvm::APSInt Oversized; 8881 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8882 SizeIsNegative, 8883 Oversized); 8884 if (!FixedTy.isNull()) { 8885 Diag(Loc, diag::warn_illegal_constant_array_size); 8886 T = FixedTy; 8887 } else { 8888 if (SizeIsNegative) 8889 Diag(Loc, diag::err_typecheck_negative_array_size); 8890 else if (Oversized.getBoolValue()) 8891 Diag(Loc, diag::err_array_too_large) 8892 << Oversized.toString(10); 8893 else 8894 Diag(Loc, diag::err_typecheck_field_variable_size); 8895 InvalidDecl = true; 8896 } 8897 } 8898 8899 // Fields can not have abstract class types 8900 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8901 diag::err_abstract_type_in_decl, 8902 AbstractFieldType)) 8903 InvalidDecl = true; 8904 8905 bool ZeroWidth = false; 8906 // If this is declared as a bit-field, check the bit-field. 8907 if (!InvalidDecl && BitWidth) { 8908 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 8909 if (!BitWidth) { 8910 InvalidDecl = true; 8911 BitWidth = 0; 8912 ZeroWidth = false; 8913 } 8914 } 8915 8916 // Check that 'mutable' is consistent with the type of the declaration. 8917 if (!InvalidDecl && Mutable) { 8918 unsigned DiagID = 0; 8919 if (T->isReferenceType()) 8920 DiagID = diag::err_mutable_reference; 8921 else if (T.isConstQualified()) 8922 DiagID = diag::err_mutable_const; 8923 8924 if (DiagID) { 8925 SourceLocation ErrLoc = Loc; 8926 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8927 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8928 Diag(ErrLoc, DiagID); 8929 Mutable = false; 8930 InvalidDecl = true; 8931 } 8932 } 8933 8934 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8935 BitWidth, Mutable, HasInit); 8936 if (InvalidDecl) 8937 NewFD->setInvalidDecl(); 8938 8939 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8940 Diag(Loc, diag::err_duplicate_member) << II; 8941 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8942 NewFD->setInvalidDecl(); 8943 } 8944 8945 if (!InvalidDecl && getLangOpts().CPlusPlus) { 8946 if (Record->isUnion()) { 8947 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8948 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8949 if (RDecl->getDefinition()) { 8950 // C++ [class.union]p1: An object of a class with a non-trivial 8951 // constructor, a non-trivial copy constructor, a non-trivial 8952 // destructor, or a non-trivial copy assignment operator 8953 // cannot be a member of a union, nor can an array of such 8954 // objects. 8955 if (CheckNontrivialField(NewFD)) 8956 NewFD->setInvalidDecl(); 8957 } 8958 } 8959 8960 // C++ [class.union]p1: If a union contains a member of reference type, 8961 // the program is ill-formed. 8962 if (EltTy->isReferenceType()) { 8963 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8964 << NewFD->getDeclName() << EltTy; 8965 NewFD->setInvalidDecl(); 8966 } 8967 } 8968 } 8969 8970 // FIXME: We need to pass in the attributes given an AST 8971 // representation, not a parser representation. 8972 if (D) 8973 // FIXME: What to pass instead of TUScope? 8974 ProcessDeclAttributes(TUScope, NewFD, *D); 8975 8976 // In auto-retain/release, infer strong retension for fields of 8977 // retainable type. 8978 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8979 NewFD->setInvalidDecl(); 8980 8981 if (T.isObjCGCWeak()) 8982 Diag(Loc, diag::warn_attribute_weak_on_field); 8983 8984 NewFD->setAccess(AS); 8985 return NewFD; 8986} 8987 8988bool Sema::CheckNontrivialField(FieldDecl *FD) { 8989 assert(FD); 8990 assert(getLangOpts().CPlusPlus && "valid check only for C++"); 8991 8992 if (FD->isInvalidDecl()) 8993 return true; 8994 8995 QualType EltTy = Context.getBaseElementType(FD->getType()); 8996 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8997 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8998 if (RDecl->getDefinition()) { 8999 // We check for copy constructors before constructors 9000 // because otherwise we'll never get complaints about 9001 // copy constructors. 9002 9003 CXXSpecialMember member = CXXInvalid; 9004 if (!RDecl->hasTrivialCopyConstructor()) 9005 member = CXXCopyConstructor; 9006 else if (!RDecl->hasTrivialDefaultConstructor()) 9007 member = CXXDefaultConstructor; 9008 else if (!RDecl->hasTrivialCopyAssignment()) 9009 member = CXXCopyAssignment; 9010 else if (!RDecl->hasTrivialDestructor()) 9011 member = CXXDestructor; 9012 9013 if (member != CXXInvalid) { 9014 if (!getLangOpts().CPlusPlus0x && 9015 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) { 9016 // Objective-C++ ARC: it is an error to have a non-trivial field of 9017 // a union. However, system headers in Objective-C programs 9018 // occasionally have Objective-C lifetime objects within unions, 9019 // and rather than cause the program to fail, we make those 9020 // members unavailable. 9021 SourceLocation Loc = FD->getLocation(); 9022 if (getSourceManager().isInSystemHeader(Loc)) { 9023 if (!FD->hasAttr<UnavailableAttr>()) 9024 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 9025 "this system field has retaining ownership")); 9026 return false; 9027 } 9028 } 9029 9030 Diag(FD->getLocation(), getLangOpts().CPlusPlus0x ? 9031 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 9032 diag::err_illegal_union_or_anon_struct_member) 9033 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 9034 DiagnoseNontrivial(RT, member); 9035 return !getLangOpts().CPlusPlus0x; 9036 } 9037 } 9038 } 9039 9040 return false; 9041} 9042 9043/// If the given constructor is user-provided, produce a diagnostic explaining 9044/// that it makes the class non-trivial. 9045static bool DiagnoseNontrivialUserProvidedCtor(Sema &S, QualType QT, 9046 CXXConstructorDecl *CD, 9047 Sema::CXXSpecialMember CSM) { 9048 if (!CD->isUserProvided()) 9049 return false; 9050 9051 SourceLocation CtorLoc = CD->getLocation(); 9052 S.Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << CSM; 9053 return true; 9054} 9055 9056/// DiagnoseNontrivial - Given that a class has a non-trivial 9057/// special member, figure out why. 9058void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 9059 QualType QT(T, 0U); 9060 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 9061 9062 // Check whether the member was user-declared. 9063 switch (member) { 9064 case CXXInvalid: 9065 break; 9066 9067 case CXXDefaultConstructor: 9068 if (RD->hasUserDeclaredConstructor()) { 9069 typedef CXXRecordDecl::ctor_iterator ctor_iter; 9070 for (ctor_iter CI = RD->ctor_begin(), CE = RD->ctor_end(); CI != CE; ++CI) 9071 if (DiagnoseNontrivialUserProvidedCtor(*this, QT, *CI, member)) 9072 return; 9073 9074 // No user-provided constructors; look for constructor templates. 9075 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 9076 tmpl_iter; 9077 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); 9078 TI != TE; ++TI) { 9079 CXXConstructorDecl *CD = 9080 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()); 9081 if (CD && DiagnoseNontrivialUserProvidedCtor(*this, QT, CD, member)) 9082 return; 9083 } 9084 } 9085 break; 9086 9087 case CXXCopyConstructor: 9088 if (RD->hasUserDeclaredCopyConstructor()) { 9089 SourceLocation CtorLoc = 9090 RD->getCopyConstructor(0)->getLocation(); 9091 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9092 return; 9093 } 9094 break; 9095 9096 case CXXMoveConstructor: 9097 if (RD->hasUserDeclaredMoveConstructor()) { 9098 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 9099 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9100 return; 9101 } 9102 break; 9103 9104 case CXXCopyAssignment: 9105 if (RD->hasUserDeclaredCopyAssignment()) { 9106 // FIXME: this should use the location of the copy 9107 // assignment, not the type. 9108 SourceLocation TyLoc = RD->getLocStart(); 9109 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 9110 return; 9111 } 9112 break; 9113 9114 case CXXMoveAssignment: 9115 if (RD->hasUserDeclaredMoveAssignment()) { 9116 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 9117 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9118 return; 9119 } 9120 break; 9121 9122 case CXXDestructor: 9123 if (RD->hasUserDeclaredDestructor()) { 9124 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 9125 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9126 return; 9127 } 9128 break; 9129 } 9130 9131 typedef CXXRecordDecl::base_class_iterator base_iter; 9132 9133 // Virtual bases and members inhibit trivial copying/construction, 9134 // but not trivial destruction. 9135 if (member != CXXDestructor) { 9136 // Check for virtual bases. vbases includes indirect virtual bases, 9137 // so we just iterate through the direct bases. 9138 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 9139 if (bi->isVirtual()) { 9140 SourceLocation BaseLoc = bi->getLocStart(); 9141 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 9142 return; 9143 } 9144 9145 // Check for virtual methods. 9146 typedef CXXRecordDecl::method_iterator meth_iter; 9147 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 9148 ++mi) { 9149 if (mi->isVirtual()) { 9150 SourceLocation MLoc = mi->getLocStart(); 9151 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 9152 return; 9153 } 9154 } 9155 } 9156 9157 bool (CXXRecordDecl::*hasTrivial)() const; 9158 switch (member) { 9159 case CXXDefaultConstructor: 9160 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 9161 case CXXCopyConstructor: 9162 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 9163 case CXXCopyAssignment: 9164 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 9165 case CXXDestructor: 9166 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 9167 default: 9168 llvm_unreachable("unexpected special member"); 9169 } 9170 9171 // Check for nontrivial bases (and recurse). 9172 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 9173 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 9174 assert(BaseRT && "Don't know how to handle dependent bases"); 9175 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 9176 if (!(BaseRecTy->*hasTrivial)()) { 9177 SourceLocation BaseLoc = bi->getLocStart(); 9178 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 9179 DiagnoseNontrivial(BaseRT, member); 9180 return; 9181 } 9182 } 9183 9184 // Check for nontrivial members (and recurse). 9185 typedef RecordDecl::field_iterator field_iter; 9186 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 9187 ++fi) { 9188 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 9189 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 9190 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 9191 9192 if (!(EltRD->*hasTrivial)()) { 9193 SourceLocation FLoc = (*fi)->getLocation(); 9194 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 9195 DiagnoseNontrivial(EltRT, member); 9196 return; 9197 } 9198 } 9199 9200 if (EltTy->isObjCLifetimeType()) { 9201 switch (EltTy.getObjCLifetime()) { 9202 case Qualifiers::OCL_None: 9203 case Qualifiers::OCL_ExplicitNone: 9204 break; 9205 9206 case Qualifiers::OCL_Autoreleasing: 9207 case Qualifiers::OCL_Weak: 9208 case Qualifiers::OCL_Strong: 9209 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 9210 << QT << EltTy.getObjCLifetime(); 9211 return; 9212 } 9213 } 9214 } 9215 9216 llvm_unreachable("found no explanation for non-trivial member"); 9217} 9218 9219/// TranslateIvarVisibility - Translate visibility from a token ID to an 9220/// AST enum value. 9221static ObjCIvarDecl::AccessControl 9222TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9223 switch (ivarVisibility) { 9224 default: llvm_unreachable("Unknown visitibility kind"); 9225 case tok::objc_private: return ObjCIvarDecl::Private; 9226 case tok::objc_public: return ObjCIvarDecl::Public; 9227 case tok::objc_protected: return ObjCIvarDecl::Protected; 9228 case tok::objc_package: return ObjCIvarDecl::Package; 9229 } 9230} 9231 9232/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9233/// in order to create an IvarDecl object for it. 9234Decl *Sema::ActOnIvar(Scope *S, 9235 SourceLocation DeclStart, 9236 Declarator &D, Expr *BitfieldWidth, 9237 tok::ObjCKeywordKind Visibility) { 9238 9239 IdentifierInfo *II = D.getIdentifier(); 9240 Expr *BitWidth = (Expr*)BitfieldWidth; 9241 SourceLocation Loc = DeclStart; 9242 if (II) Loc = D.getIdentifierLoc(); 9243 9244 // FIXME: Unnamed fields can be handled in various different ways, for 9245 // example, unnamed unions inject all members into the struct namespace! 9246 9247 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9248 QualType T = TInfo->getType(); 9249 9250 if (BitWidth) { 9251 // 6.7.2.1p3, 6.7.2.1p4 9252 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9253 if (!BitWidth) 9254 D.setInvalidType(); 9255 } else { 9256 // Not a bitfield. 9257 9258 // validate II. 9259 9260 } 9261 if (T->isReferenceType()) { 9262 Diag(Loc, diag::err_ivar_reference_type); 9263 D.setInvalidType(); 9264 } 9265 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9266 // than a variably modified type. 9267 else if (T->isVariablyModifiedType()) { 9268 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9269 D.setInvalidType(); 9270 } 9271 9272 // Get the visibility (access control) for this ivar. 9273 ObjCIvarDecl::AccessControl ac = 9274 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9275 : ObjCIvarDecl::None; 9276 // Must set ivar's DeclContext to its enclosing interface. 9277 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9278 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9279 return 0; 9280 ObjCContainerDecl *EnclosingContext; 9281 if (ObjCImplementationDecl *IMPDecl = 9282 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9283 if (!LangOpts.ObjCNonFragileABI2) { 9284 // Case of ivar declared in an implementation. Context is that of its class. 9285 EnclosingContext = IMPDecl->getClassInterface(); 9286 assert(EnclosingContext && "Implementation has no class interface!"); 9287 } 9288 else 9289 EnclosingContext = EnclosingDecl; 9290 } else { 9291 if (ObjCCategoryDecl *CDecl = 9292 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9293 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9294 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9295 return 0; 9296 } 9297 } 9298 EnclosingContext = EnclosingDecl; 9299 } 9300 9301 // Construct the decl. 9302 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9303 DeclStart, Loc, II, T, 9304 TInfo, ac, (Expr *)BitfieldWidth); 9305 9306 if (II) { 9307 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9308 ForRedeclaration); 9309 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9310 && !isa<TagDecl>(PrevDecl)) { 9311 Diag(Loc, diag::err_duplicate_member) << II; 9312 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9313 NewID->setInvalidDecl(); 9314 } 9315 } 9316 9317 // Process attributes attached to the ivar. 9318 ProcessDeclAttributes(S, NewID, D); 9319 9320 if (D.isInvalidType()) 9321 NewID->setInvalidDecl(); 9322 9323 // In ARC, infer 'retaining' for ivars of retainable type. 9324 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9325 NewID->setInvalidDecl(); 9326 9327 if (D.getDeclSpec().isModulePrivateSpecified()) 9328 NewID->setModulePrivate(); 9329 9330 if (II) { 9331 // FIXME: When interfaces are DeclContexts, we'll need to add 9332 // these to the interface. 9333 S->AddDecl(NewID); 9334 IdResolver.AddDecl(NewID); 9335 } 9336 9337 return NewID; 9338} 9339 9340/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9341/// class and class extensions. For every class @interface and class 9342/// extension @interface, if the last ivar is a bitfield of any type, 9343/// then add an implicit `char :0` ivar to the end of that interface. 9344void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9345 SmallVectorImpl<Decl *> &AllIvarDecls) { 9346 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9347 return; 9348 9349 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9350 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9351 9352 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9353 return; 9354 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9355 if (!ID) { 9356 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9357 if (!CD->IsClassExtension()) 9358 return; 9359 } 9360 // No need to add this to end of @implementation. 9361 else 9362 return; 9363 } 9364 // All conditions are met. Add a new bitfield to the tail end of ivars. 9365 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9366 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9367 9368 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9369 DeclLoc, DeclLoc, 0, 9370 Context.CharTy, 9371 Context.getTrivialTypeSourceInfo(Context.CharTy, 9372 DeclLoc), 9373 ObjCIvarDecl::Private, BW, 9374 true); 9375 AllIvarDecls.push_back(Ivar); 9376} 9377 9378void Sema::ActOnFields(Scope* S, 9379 SourceLocation RecLoc, Decl *EnclosingDecl, 9380 llvm::ArrayRef<Decl *> Fields, 9381 SourceLocation LBrac, SourceLocation RBrac, 9382 AttributeList *Attr) { 9383 assert(EnclosingDecl && "missing record or interface decl"); 9384 9385 // If the decl this is being inserted into is invalid, then it may be a 9386 // redeclaration or some other bogus case. Don't try to add fields to it. 9387 if (EnclosingDecl->isInvalidDecl()) 9388 return; 9389 9390 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9391 9392 // Start counting up the number of named members; make sure to include 9393 // members of anonymous structs and unions in the total. 9394 unsigned NumNamedMembers = 0; 9395 if (Record) { 9396 for (RecordDecl::decl_iterator i = Record->decls_begin(), 9397 e = Record->decls_end(); i != e; i++) { 9398 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i)) 9399 if (IFD->getDeclName()) 9400 ++NumNamedMembers; 9401 } 9402 } 9403 9404 // Verify that all the fields are okay. 9405 SmallVector<FieldDecl*, 32> RecFields; 9406 9407 bool ARCErrReported = false; 9408 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9409 i != end; ++i) { 9410 FieldDecl *FD = cast<FieldDecl>(*i); 9411 9412 // Get the type for the field. 9413 const Type *FDTy = FD->getType().getTypePtr(); 9414 9415 if (!FD->isAnonymousStructOrUnion()) { 9416 // Remember all fields written by the user. 9417 RecFields.push_back(FD); 9418 } 9419 9420 // If the field is already invalid for some reason, don't emit more 9421 // diagnostics about it. 9422 if (FD->isInvalidDecl()) { 9423 EnclosingDecl->setInvalidDecl(); 9424 continue; 9425 } 9426 9427 // C99 6.7.2.1p2: 9428 // A structure or union shall not contain a member with 9429 // incomplete or function type (hence, a structure shall not 9430 // contain an instance of itself, but may contain a pointer to 9431 // an instance of itself), except that the last member of a 9432 // structure with more than one named member may have incomplete 9433 // array type; such a structure (and any union containing, 9434 // possibly recursively, a member that is such a structure) 9435 // shall not be a member of a structure or an element of an 9436 // array. 9437 if (FDTy->isFunctionType()) { 9438 // Field declared as a function. 9439 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9440 << FD->getDeclName(); 9441 FD->setInvalidDecl(); 9442 EnclosingDecl->setInvalidDecl(); 9443 continue; 9444 } else if (FDTy->isIncompleteArrayType() && Record && 9445 ((i + 1 == Fields.end() && !Record->isUnion()) || 9446 ((getLangOpts().MicrosoftExt || 9447 getLangOpts().CPlusPlus) && 9448 (i + 1 == Fields.end() || Record->isUnion())))) { 9449 // Flexible array member. 9450 // Microsoft and g++ is more permissive regarding flexible array. 9451 // It will accept flexible array in union and also 9452 // as the sole element of a struct/class. 9453 if (getLangOpts().MicrosoftExt) { 9454 if (Record->isUnion()) 9455 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9456 << FD->getDeclName(); 9457 else if (Fields.size() == 1) 9458 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9459 << FD->getDeclName() << Record->getTagKind(); 9460 } else if (getLangOpts().CPlusPlus) { 9461 if (Record->isUnion()) 9462 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9463 << FD->getDeclName(); 9464 else if (Fields.size() == 1) 9465 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9466 << FD->getDeclName() << Record->getTagKind(); 9467 } else if (NumNamedMembers < 1) { 9468 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9469 << FD->getDeclName(); 9470 FD->setInvalidDecl(); 9471 EnclosingDecl->setInvalidDecl(); 9472 continue; 9473 } 9474 if (!FD->getType()->isDependentType() && 9475 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9476 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9477 << FD->getDeclName() << FD->getType(); 9478 FD->setInvalidDecl(); 9479 EnclosingDecl->setInvalidDecl(); 9480 continue; 9481 } 9482 // Okay, we have a legal flexible array member at the end of the struct. 9483 if (Record) 9484 Record->setHasFlexibleArrayMember(true); 9485 } else if (!FDTy->isDependentType() && 9486 RequireCompleteType(FD->getLocation(), FD->getType(), 9487 diag::err_field_incomplete)) { 9488 // Incomplete type 9489 FD->setInvalidDecl(); 9490 EnclosingDecl->setInvalidDecl(); 9491 continue; 9492 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9493 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9494 // If this is a member of a union, then entire union becomes "flexible". 9495 if (Record && Record->isUnion()) { 9496 Record->setHasFlexibleArrayMember(true); 9497 } else { 9498 // If this is a struct/class and this is not the last element, reject 9499 // it. Note that GCC supports variable sized arrays in the middle of 9500 // structures. 9501 if (i + 1 != Fields.end()) 9502 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9503 << FD->getDeclName() << FD->getType(); 9504 else { 9505 // We support flexible arrays at the end of structs in 9506 // other structs as an extension. 9507 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9508 << FD->getDeclName(); 9509 if (Record) 9510 Record->setHasFlexibleArrayMember(true); 9511 } 9512 } 9513 } 9514 if (Record && FDTTy->getDecl()->hasObjectMember()) 9515 Record->setHasObjectMember(true); 9516 } else if (FDTy->isObjCObjectType()) { 9517 /// A field cannot be an Objective-c object 9518 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9519 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9520 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9521 FD->setType(T); 9522 } 9523 else if (!getLangOpts().CPlusPlus) { 9524 if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported) { 9525 // It's an error in ARC if a field has lifetime. 9526 // We don't want to report this in a system header, though, 9527 // so we just make the field unavailable. 9528 // FIXME: that's really not sufficient; we need to make the type 9529 // itself invalid to, say, initialize or copy. 9530 QualType T = FD->getType(); 9531 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9532 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9533 SourceLocation loc = FD->getLocation(); 9534 if (getSourceManager().isInSystemHeader(loc)) { 9535 if (!FD->hasAttr<UnavailableAttr>()) { 9536 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9537 "this system field has retaining ownership")); 9538 } 9539 } else { 9540 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9541 << T->isBlockPointerType(); 9542 } 9543 ARCErrReported = true; 9544 } 9545 } 9546 else if (getLangOpts().ObjC1 && 9547 getLangOpts().getGC() != LangOptions::NonGC && 9548 Record && !Record->hasObjectMember()) { 9549 if (FD->getType()->isObjCObjectPointerType() || 9550 FD->getType().isObjCGCStrong()) 9551 Record->setHasObjectMember(true); 9552 else if (Context.getAsArrayType(FD->getType())) { 9553 QualType BaseType = Context.getBaseElementType(FD->getType()); 9554 if (BaseType->isRecordType() && 9555 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9556 Record->setHasObjectMember(true); 9557 else if (BaseType->isObjCObjectPointerType() || 9558 BaseType.isObjCGCStrong()) 9559 Record->setHasObjectMember(true); 9560 } 9561 } 9562 } 9563 // Keep track of the number of named members. 9564 if (FD->getIdentifier()) 9565 ++NumNamedMembers; 9566 } 9567 9568 // Okay, we successfully defined 'Record'. 9569 if (Record) { 9570 bool Completed = false; 9571 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9572 if (!CXXRecord->isInvalidDecl()) { 9573 // Set access bits correctly on the directly-declared conversions. 9574 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9575 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9576 I != E; ++I) 9577 Convs->setAccess(I, (*I)->getAccess()); 9578 9579 if (!CXXRecord->isDependentType()) { 9580 // Objective-C Automatic Reference Counting: 9581 // If a class has a non-static data member of Objective-C pointer 9582 // type (or array thereof), it is a non-POD type and its 9583 // default constructor (if any), copy constructor, copy assignment 9584 // operator, and destructor are non-trivial. 9585 // 9586 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9587 // However, here we check whether this particular class is only 9588 // non-POD because of the presence of an Objective-C pointer member. 9589 // If so, objects of this type cannot be shared between code compiled 9590 // with instant objects and code compiled with manual retain/release. 9591 if (getLangOpts().ObjCAutoRefCount && 9592 CXXRecord->hasObjectMember() && 9593 CXXRecord->getLinkage() == ExternalLinkage) { 9594 if (CXXRecord->isPOD()) { 9595 Diag(CXXRecord->getLocation(), 9596 diag::warn_arc_non_pod_class_with_object_member) 9597 << CXXRecord; 9598 } else { 9599 // FIXME: Fix-Its would be nice here, but finding a good location 9600 // for them is going to be tricky. 9601 if (CXXRecord->hasTrivialCopyConstructor()) 9602 Diag(CXXRecord->getLocation(), 9603 diag::warn_arc_trivial_member_function_with_object_member) 9604 << CXXRecord << 0; 9605 if (CXXRecord->hasTrivialCopyAssignment()) 9606 Diag(CXXRecord->getLocation(), 9607 diag::warn_arc_trivial_member_function_with_object_member) 9608 << CXXRecord << 1; 9609 if (CXXRecord->hasTrivialDestructor()) 9610 Diag(CXXRecord->getLocation(), 9611 diag::warn_arc_trivial_member_function_with_object_member) 9612 << CXXRecord << 2; 9613 } 9614 } 9615 9616 // Adjust user-defined destructor exception spec. 9617 if (getLangOpts().CPlusPlus0x && 9618 CXXRecord->hasUserDeclaredDestructor()) 9619 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9620 9621 // Add any implicitly-declared members to this class. 9622 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9623 9624 // If we have virtual base classes, we may end up finding multiple 9625 // final overriders for a given virtual function. Check for this 9626 // problem now. 9627 if (CXXRecord->getNumVBases()) { 9628 CXXFinalOverriderMap FinalOverriders; 9629 CXXRecord->getFinalOverriders(FinalOverriders); 9630 9631 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9632 MEnd = FinalOverriders.end(); 9633 M != MEnd; ++M) { 9634 for (OverridingMethods::iterator SO = M->second.begin(), 9635 SOEnd = M->second.end(); 9636 SO != SOEnd; ++SO) { 9637 assert(SO->second.size() > 0 && 9638 "Virtual function without overridding functions?"); 9639 if (SO->second.size() == 1) 9640 continue; 9641 9642 // C++ [class.virtual]p2: 9643 // In a derived class, if a virtual member function of a base 9644 // class subobject has more than one final overrider the 9645 // program is ill-formed. 9646 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9647 << (NamedDecl *)M->first << Record; 9648 Diag(M->first->getLocation(), 9649 diag::note_overridden_virtual_function); 9650 for (OverridingMethods::overriding_iterator 9651 OM = SO->second.begin(), 9652 OMEnd = SO->second.end(); 9653 OM != OMEnd; ++OM) 9654 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9655 << (NamedDecl *)M->first << OM->Method->getParent(); 9656 9657 Record->setInvalidDecl(); 9658 } 9659 } 9660 CXXRecord->completeDefinition(&FinalOverriders); 9661 Completed = true; 9662 } 9663 } 9664 } 9665 } 9666 9667 if (!Completed) 9668 Record->completeDefinition(); 9669 9670 // Now that the record is complete, do any delayed exception spec checks 9671 // we were missing. 9672 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9673 const CXXDestructorDecl *Dtor = 9674 DelayedDestructorExceptionSpecChecks.back().first; 9675 if (Dtor->getParent() != Record) 9676 break; 9677 9678 assert(!Dtor->getParent()->isDependentType() && 9679 "Should not ever add destructors of templates into the list."); 9680 CheckOverridingFunctionExceptionSpec(Dtor, 9681 DelayedDestructorExceptionSpecChecks.back().second); 9682 DelayedDestructorExceptionSpecChecks.pop_back(); 9683 } 9684 9685 } else { 9686 ObjCIvarDecl **ClsFields = 9687 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9688 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9689 ID->setEndOfDefinitionLoc(RBrac); 9690 // Add ivar's to class's DeclContext. 9691 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9692 ClsFields[i]->setLexicalDeclContext(ID); 9693 ID->addDecl(ClsFields[i]); 9694 } 9695 // Must enforce the rule that ivars in the base classes may not be 9696 // duplicates. 9697 if (ID->getSuperClass()) 9698 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9699 } else if (ObjCImplementationDecl *IMPDecl = 9700 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9701 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9702 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9703 // Ivar declared in @implementation never belongs to the implementation. 9704 // Only it is in implementation's lexical context. 9705 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9706 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9707 IMPDecl->setIvarLBraceLoc(LBrac); 9708 IMPDecl->setIvarRBraceLoc(RBrac); 9709 } else if (ObjCCategoryDecl *CDecl = 9710 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9711 // case of ivars in class extension; all other cases have been 9712 // reported as errors elsewhere. 9713 // FIXME. Class extension does not have a LocEnd field. 9714 // CDecl->setLocEnd(RBrac); 9715 // Add ivar's to class extension's DeclContext. 9716 // Diagnose redeclaration of private ivars. 9717 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9718 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9719 if (IDecl) { 9720 if (const ObjCIvarDecl *ClsIvar = 9721 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9722 Diag(ClsFields[i]->getLocation(), 9723 diag::err_duplicate_ivar_declaration); 9724 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9725 continue; 9726 } 9727 for (const ObjCCategoryDecl *ClsExtDecl = 9728 IDecl->getFirstClassExtension(); 9729 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9730 if (const ObjCIvarDecl *ClsExtIvar = 9731 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9732 Diag(ClsFields[i]->getLocation(), 9733 diag::err_duplicate_ivar_declaration); 9734 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9735 continue; 9736 } 9737 } 9738 } 9739 ClsFields[i]->setLexicalDeclContext(CDecl); 9740 CDecl->addDecl(ClsFields[i]); 9741 } 9742 CDecl->setIvarLBraceLoc(LBrac); 9743 CDecl->setIvarRBraceLoc(RBrac); 9744 } 9745 } 9746 9747 if (Attr) 9748 ProcessDeclAttributeList(S, Record, Attr); 9749 9750 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9751 // set the visibility of this record. 9752 if (Record && !Record->getDeclContext()->isRecord()) 9753 AddPushedVisibilityAttribute(Record); 9754} 9755 9756/// \brief Determine whether the given integral value is representable within 9757/// the given type T. 9758static bool isRepresentableIntegerValue(ASTContext &Context, 9759 llvm::APSInt &Value, 9760 QualType T) { 9761 assert(T->isIntegralType(Context) && "Integral type required!"); 9762 unsigned BitWidth = Context.getIntWidth(T); 9763 9764 if (Value.isUnsigned() || Value.isNonNegative()) { 9765 if (T->isSignedIntegerOrEnumerationType()) 9766 --BitWidth; 9767 return Value.getActiveBits() <= BitWidth; 9768 } 9769 return Value.getMinSignedBits() <= BitWidth; 9770} 9771 9772// \brief Given an integral type, return the next larger integral type 9773// (or a NULL type of no such type exists). 9774static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9775 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9776 // enum checking below. 9777 assert(T->isIntegralType(Context) && "Integral type required!"); 9778 const unsigned NumTypes = 4; 9779 QualType SignedIntegralTypes[NumTypes] = { 9780 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9781 }; 9782 QualType UnsignedIntegralTypes[NumTypes] = { 9783 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9784 Context.UnsignedLongLongTy 9785 }; 9786 9787 unsigned BitWidth = Context.getTypeSize(T); 9788 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9789 : UnsignedIntegralTypes; 9790 for (unsigned I = 0; I != NumTypes; ++I) 9791 if (Context.getTypeSize(Types[I]) > BitWidth) 9792 return Types[I]; 9793 9794 return QualType(); 9795} 9796 9797EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9798 EnumConstantDecl *LastEnumConst, 9799 SourceLocation IdLoc, 9800 IdentifierInfo *Id, 9801 Expr *Val) { 9802 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9803 llvm::APSInt EnumVal(IntWidth); 9804 QualType EltTy; 9805 9806 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9807 Val = 0; 9808 9809 if (Val) 9810 Val = DefaultLvalueConversion(Val).take(); 9811 9812 if (Val) { 9813 if (Enum->isDependentType() || Val->isTypeDependent()) 9814 EltTy = Context.DependentTy; 9815 else { 9816 SourceLocation ExpLoc; 9817 if (getLangOpts().CPlusPlus0x && Enum->isFixed() && 9818 !getLangOpts().MicrosoftMode) { 9819 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 9820 // constant-expression in the enumerator-definition shall be a converted 9821 // constant expression of the underlying type. 9822 EltTy = Enum->getIntegerType(); 9823 ExprResult Converted = 9824 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 9825 CCEK_Enumerator); 9826 if (Converted.isInvalid()) 9827 Val = 0; 9828 else 9829 Val = Converted.take(); 9830 } else if (!Val->isValueDependent() && 9831 !(Val = VerifyIntegerConstantExpression(Val, 9832 &EnumVal).take())) { 9833 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9834 } else { 9835 if (Enum->isFixed()) { 9836 EltTy = Enum->getIntegerType(); 9837 9838 // In Obj-C and Microsoft mode, require the enumeration value to be 9839 // representable in the underlying type of the enumeration. In C++11, 9840 // we perform a non-narrowing conversion as part of converted constant 9841 // expression checking. 9842 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9843 if (getLangOpts().MicrosoftMode) { 9844 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9845 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9846 } else 9847 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 9848 } else 9849 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9850 } else if (getLangOpts().CPlusPlus) { 9851 // C++11 [dcl.enum]p5: 9852 // If the underlying type is not fixed, the type of each enumerator 9853 // is the type of its initializing value: 9854 // - If an initializer is specified for an enumerator, the 9855 // initializing value has the same type as the expression. 9856 EltTy = Val->getType(); 9857 } else { 9858 // C99 6.7.2.2p2: 9859 // The expression that defines the value of an enumeration constant 9860 // shall be an integer constant expression that has a value 9861 // representable as an int. 9862 9863 // Complain if the value is not representable in an int. 9864 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9865 Diag(IdLoc, diag::ext_enum_value_not_int) 9866 << EnumVal.toString(10) << Val->getSourceRange() 9867 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9868 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9869 // Force the type of the expression to 'int'. 9870 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9871 } 9872 EltTy = Val->getType(); 9873 } 9874 } 9875 } 9876 } 9877 9878 if (!Val) { 9879 if (Enum->isDependentType()) 9880 EltTy = Context.DependentTy; 9881 else if (!LastEnumConst) { 9882 // C++0x [dcl.enum]p5: 9883 // If the underlying type is not fixed, the type of each enumerator 9884 // is the type of its initializing value: 9885 // - If no initializer is specified for the first enumerator, the 9886 // initializing value has an unspecified integral type. 9887 // 9888 // GCC uses 'int' for its unspecified integral type, as does 9889 // C99 6.7.2.2p3. 9890 if (Enum->isFixed()) { 9891 EltTy = Enum->getIntegerType(); 9892 } 9893 else { 9894 EltTy = Context.IntTy; 9895 } 9896 } else { 9897 // Assign the last value + 1. 9898 EnumVal = LastEnumConst->getInitVal(); 9899 ++EnumVal; 9900 EltTy = LastEnumConst->getType(); 9901 9902 // Check for overflow on increment. 9903 if (EnumVal < LastEnumConst->getInitVal()) { 9904 // C++0x [dcl.enum]p5: 9905 // If the underlying type is not fixed, the type of each enumerator 9906 // is the type of its initializing value: 9907 // 9908 // - Otherwise the type of the initializing value is the same as 9909 // the type of the initializing value of the preceding enumerator 9910 // unless the incremented value is not representable in that type, 9911 // in which case the type is an unspecified integral type 9912 // sufficient to contain the incremented value. If no such type 9913 // exists, the program is ill-formed. 9914 QualType T = getNextLargerIntegralType(Context, EltTy); 9915 if (T.isNull() || Enum->isFixed()) { 9916 // There is no integral type larger enough to represent this 9917 // value. Complain, then allow the value to wrap around. 9918 EnumVal = LastEnumConst->getInitVal(); 9919 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9920 ++EnumVal; 9921 if (Enum->isFixed()) 9922 // When the underlying type is fixed, this is ill-formed. 9923 Diag(IdLoc, diag::err_enumerator_wrapped) 9924 << EnumVal.toString(10) 9925 << EltTy; 9926 else 9927 Diag(IdLoc, diag::warn_enumerator_too_large) 9928 << EnumVal.toString(10); 9929 } else { 9930 EltTy = T; 9931 } 9932 9933 // Retrieve the last enumerator's value, extent that type to the 9934 // type that is supposed to be large enough to represent the incremented 9935 // value, then increment. 9936 EnumVal = LastEnumConst->getInitVal(); 9937 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9938 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9939 ++EnumVal; 9940 9941 // If we're not in C++, diagnose the overflow of enumerator values, 9942 // which in C99 means that the enumerator value is not representable in 9943 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9944 // permits enumerator values that are representable in some larger 9945 // integral type. 9946 if (!getLangOpts().CPlusPlus && !T.isNull()) 9947 Diag(IdLoc, diag::warn_enum_value_overflow); 9948 } else if (!getLangOpts().CPlusPlus && 9949 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9950 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9951 Diag(IdLoc, diag::ext_enum_value_not_int) 9952 << EnumVal.toString(10) << 1; 9953 } 9954 } 9955 } 9956 9957 if (!EltTy->isDependentType()) { 9958 // Make the enumerator value match the signedness and size of the 9959 // enumerator's type. 9960 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); 9961 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9962 } 9963 9964 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9965 Val, EnumVal); 9966} 9967 9968 9969Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9970 SourceLocation IdLoc, IdentifierInfo *Id, 9971 AttributeList *Attr, 9972 SourceLocation EqualLoc, Expr *Val) { 9973 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9974 EnumConstantDecl *LastEnumConst = 9975 cast_or_null<EnumConstantDecl>(lastEnumConst); 9976 9977 // The scope passed in may not be a decl scope. Zip up the scope tree until 9978 // we find one that is. 9979 S = getNonFieldDeclScope(S); 9980 9981 // Verify that there isn't already something declared with this name in this 9982 // scope. 9983 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9984 ForRedeclaration); 9985 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9986 // Maybe we will complain about the shadowed template parameter. 9987 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9988 // Just pretend that we didn't see the previous declaration. 9989 PrevDecl = 0; 9990 } 9991 9992 if (PrevDecl) { 9993 // When in C++, we may get a TagDecl with the same name; in this case the 9994 // enum constant will 'hide' the tag. 9995 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9996 "Received TagDecl when not in C++!"); 9997 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9998 if (isa<EnumConstantDecl>(PrevDecl)) 9999 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 10000 else 10001 Diag(IdLoc, diag::err_redefinition) << Id; 10002 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 10003 return 0; 10004 } 10005 } 10006 10007 // C++ [class.mem]p13: 10008 // If T is the name of a class, then each of the following shall have a 10009 // name different from T: 10010 // - every enumerator of every member of class T that is an enumerated 10011 // type 10012 if (CXXRecordDecl *Record 10013 = dyn_cast<CXXRecordDecl>( 10014 TheEnumDecl->getDeclContext()->getRedeclContext())) 10015 if (Record->getIdentifier() && Record->getIdentifier() == Id) 10016 Diag(IdLoc, diag::err_member_name_of_class) << Id; 10017 10018 EnumConstantDecl *New = 10019 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 10020 10021 if (New) { 10022 // Process attributes. 10023 if (Attr) ProcessDeclAttributeList(S, New, Attr); 10024 10025 // Register this decl in the current scope stack. 10026 New->setAccess(TheEnumDecl->getAccess()); 10027 PushOnScopeChains(New, S); 10028 } 10029 10030 return New; 10031} 10032 10033void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 10034 SourceLocation RBraceLoc, Decl *EnumDeclX, 10035 Decl **Elements, unsigned NumElements, 10036 Scope *S, AttributeList *Attr) { 10037 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 10038 QualType EnumType = Context.getTypeDeclType(Enum); 10039 10040 if (Attr) 10041 ProcessDeclAttributeList(S, Enum, Attr); 10042 10043 if (Enum->isDependentType()) { 10044 for (unsigned i = 0; i != NumElements; ++i) { 10045 EnumConstantDecl *ECD = 10046 cast_or_null<EnumConstantDecl>(Elements[i]); 10047 if (!ECD) continue; 10048 10049 ECD->setType(EnumType); 10050 } 10051 10052 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 10053 return; 10054 } 10055 10056 // TODO: If the result value doesn't fit in an int, it must be a long or long 10057 // long value. ISO C does not support this, but GCC does as an extension, 10058 // emit a warning. 10059 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10060 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 10061 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 10062 10063 // Verify that all the values are okay, compute the size of the values, and 10064 // reverse the list. 10065 unsigned NumNegativeBits = 0; 10066 unsigned NumPositiveBits = 0; 10067 10068 // Keep track of whether all elements have type int. 10069 bool AllElementsInt = true; 10070 10071 for (unsigned i = 0; i != NumElements; ++i) { 10072 EnumConstantDecl *ECD = 10073 cast_or_null<EnumConstantDecl>(Elements[i]); 10074 if (!ECD) continue; // Already issued a diagnostic. 10075 10076 const llvm::APSInt &InitVal = ECD->getInitVal(); 10077 10078 // Keep track of the size of positive and negative values. 10079 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 10080 NumPositiveBits = std::max(NumPositiveBits, 10081 (unsigned)InitVal.getActiveBits()); 10082 else 10083 NumNegativeBits = std::max(NumNegativeBits, 10084 (unsigned)InitVal.getMinSignedBits()); 10085 10086 // Keep track of whether every enum element has type int (very commmon). 10087 if (AllElementsInt) 10088 AllElementsInt = ECD->getType() == Context.IntTy; 10089 } 10090 10091 // Figure out the type that should be used for this enum. 10092 QualType BestType; 10093 unsigned BestWidth; 10094 10095 // C++0x N3000 [conv.prom]p3: 10096 // An rvalue of an unscoped enumeration type whose underlying 10097 // type is not fixed can be converted to an rvalue of the first 10098 // of the following types that can represent all the values of 10099 // the enumeration: int, unsigned int, long int, unsigned long 10100 // int, long long int, or unsigned long long int. 10101 // C99 6.4.4.3p2: 10102 // An identifier declared as an enumeration constant has type int. 10103 // The C99 rule is modified by a gcc extension 10104 QualType BestPromotionType; 10105 10106 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 10107 // -fshort-enums is the equivalent to specifying the packed attribute on all 10108 // enum definitions. 10109 if (LangOpts.ShortEnums) 10110 Packed = true; 10111 10112 if (Enum->isFixed()) { 10113 BestType = Enum->getIntegerType(); 10114 if (BestType->isPromotableIntegerType()) 10115 BestPromotionType = Context.getPromotedIntegerType(BestType); 10116 else 10117 BestPromotionType = BestType; 10118 // We don't need to set BestWidth, because BestType is going to be the type 10119 // of the enumerators, but we do anyway because otherwise some compilers 10120 // warn that it might be used uninitialized. 10121 BestWidth = CharWidth; 10122 } 10123 else if (NumNegativeBits) { 10124 // If there is a negative value, figure out the smallest integer type (of 10125 // int/long/longlong) that fits. 10126 // If it's packed, check also if it fits a char or a short. 10127 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 10128 BestType = Context.SignedCharTy; 10129 BestWidth = CharWidth; 10130 } else if (Packed && NumNegativeBits <= ShortWidth && 10131 NumPositiveBits < ShortWidth) { 10132 BestType = Context.ShortTy; 10133 BestWidth = ShortWidth; 10134 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 10135 BestType = Context.IntTy; 10136 BestWidth = IntWidth; 10137 } else { 10138 BestWidth = Context.getTargetInfo().getLongWidth(); 10139 10140 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 10141 BestType = Context.LongTy; 10142 } else { 10143 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10144 10145 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 10146 Diag(Enum->getLocation(), diag::warn_enum_too_large); 10147 BestType = Context.LongLongTy; 10148 } 10149 } 10150 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 10151 } else { 10152 // If there is no negative value, figure out the smallest type that fits 10153 // all of the enumerator values. 10154 // If it's packed, check also if it fits a char or a short. 10155 if (Packed && NumPositiveBits <= CharWidth) { 10156 BestType = Context.UnsignedCharTy; 10157 BestPromotionType = Context.IntTy; 10158 BestWidth = CharWidth; 10159 } else if (Packed && NumPositiveBits <= ShortWidth) { 10160 BestType = Context.UnsignedShortTy; 10161 BestPromotionType = Context.IntTy; 10162 BestWidth = ShortWidth; 10163 } else if (NumPositiveBits <= IntWidth) { 10164 BestType = Context.UnsignedIntTy; 10165 BestWidth = IntWidth; 10166 BestPromotionType 10167 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10168 ? Context.UnsignedIntTy : Context.IntTy; 10169 } else if (NumPositiveBits <= 10170 (BestWidth = Context.getTargetInfo().getLongWidth())) { 10171 BestType = Context.UnsignedLongTy; 10172 BestPromotionType 10173 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10174 ? Context.UnsignedLongTy : Context.LongTy; 10175 } else { 10176 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10177 assert(NumPositiveBits <= BestWidth && 10178 "How could an initializer get larger than ULL?"); 10179 BestType = Context.UnsignedLongLongTy; 10180 BestPromotionType 10181 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10182 ? Context.UnsignedLongLongTy : Context.LongLongTy; 10183 } 10184 } 10185 10186 // Loop over all of the enumerator constants, changing their types to match 10187 // the type of the enum if needed. 10188 for (unsigned i = 0; i != NumElements; ++i) { 10189 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10190 if (!ECD) continue; // Already issued a diagnostic. 10191 10192 // Standard C says the enumerators have int type, but we allow, as an 10193 // extension, the enumerators to be larger than int size. If each 10194 // enumerator value fits in an int, type it as an int, otherwise type it the 10195 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 10196 // that X has type 'int', not 'unsigned'. 10197 10198 // Determine whether the value fits into an int. 10199 llvm::APSInt InitVal = ECD->getInitVal(); 10200 10201 // If it fits into an integer type, force it. Otherwise force it to match 10202 // the enum decl type. 10203 QualType NewTy; 10204 unsigned NewWidth; 10205 bool NewSign; 10206 if (!getLangOpts().CPlusPlus && 10207 !Enum->isFixed() && 10208 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 10209 NewTy = Context.IntTy; 10210 NewWidth = IntWidth; 10211 NewSign = true; 10212 } else if (ECD->getType() == BestType) { 10213 // Already the right type! 10214 if (getLangOpts().CPlusPlus) 10215 // C++ [dcl.enum]p4: Following the closing brace of an 10216 // enum-specifier, each enumerator has the type of its 10217 // enumeration. 10218 ECD->setType(EnumType); 10219 continue; 10220 } else { 10221 NewTy = BestType; 10222 NewWidth = BestWidth; 10223 NewSign = BestType->isSignedIntegerOrEnumerationType(); 10224 } 10225 10226 // Adjust the APSInt value. 10227 InitVal = InitVal.extOrTrunc(NewWidth); 10228 InitVal.setIsSigned(NewSign); 10229 ECD->setInitVal(InitVal); 10230 10231 // Adjust the Expr initializer and type. 10232 if (ECD->getInitExpr() && 10233 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10234 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10235 CK_IntegralCast, 10236 ECD->getInitExpr(), 10237 /*base paths*/ 0, 10238 VK_RValue)); 10239 if (getLangOpts().CPlusPlus) 10240 // C++ [dcl.enum]p4: Following the closing brace of an 10241 // enum-specifier, each enumerator has the type of its 10242 // enumeration. 10243 ECD->setType(EnumType); 10244 else 10245 ECD->setType(NewTy); 10246 } 10247 10248 Enum->completeDefinition(BestType, BestPromotionType, 10249 NumPositiveBits, NumNegativeBits); 10250 10251 // If we're declaring a function, ensure this decl isn't forgotten about - 10252 // it needs to go into the function scope. 10253 if (InFunctionDeclarator) 10254 DeclsInPrototypeScope.push_back(Enum); 10255 10256} 10257 10258Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10259 SourceLocation StartLoc, 10260 SourceLocation EndLoc) { 10261 StringLiteral *AsmString = cast<StringLiteral>(expr); 10262 10263 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10264 AsmString, StartLoc, 10265 EndLoc); 10266 CurContext->addDecl(New); 10267 return New; 10268} 10269 10270DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10271 SourceLocation ImportLoc, 10272 ModuleIdPath Path) { 10273 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10274 Module::AllVisible, 10275 /*IsIncludeDirective=*/false); 10276 if (!Mod) 10277 return true; 10278 10279 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10280 Module *ModCheck = Mod; 10281 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10282 // If we've run out of module parents, just drop the remaining identifiers. 10283 // We need the length to be consistent. 10284 if (!ModCheck) 10285 break; 10286 ModCheck = ModCheck->Parent; 10287 10288 IdentifierLocs.push_back(Path[I].second); 10289 } 10290 10291 ImportDecl *Import = ImportDecl::Create(Context, 10292 Context.getTranslationUnitDecl(), 10293 AtLoc.isValid()? AtLoc : ImportLoc, 10294 Mod, IdentifierLocs); 10295 Context.getTranslationUnitDecl()->addDecl(Import); 10296 return Import; 10297} 10298 10299void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name, 10300 IdentifierInfo* AliasName, 10301 SourceLocation PragmaLoc, 10302 SourceLocation NameLoc, 10303 SourceLocation AliasNameLoc) { 10304 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, 10305 LookupOrdinaryName); 10306 AsmLabelAttr *Attr = 10307 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName()); 10308 10309 if (PrevDecl) 10310 PrevDecl->addAttr(Attr); 10311 else 10312 (void)ExtnameUndeclaredIdentifiers.insert( 10313 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr)); 10314} 10315 10316void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10317 SourceLocation PragmaLoc, 10318 SourceLocation NameLoc) { 10319 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10320 10321 if (PrevDecl) { 10322 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10323 } else { 10324 (void)WeakUndeclaredIdentifiers.insert( 10325 std::pair<IdentifierInfo*,WeakInfo> 10326 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10327 } 10328} 10329 10330void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10331 IdentifierInfo* AliasName, 10332 SourceLocation PragmaLoc, 10333 SourceLocation NameLoc, 10334 SourceLocation AliasNameLoc) { 10335 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10336 LookupOrdinaryName); 10337 WeakInfo W = WeakInfo(Name, NameLoc); 10338 10339 if (PrevDecl) { 10340 if (!PrevDecl->hasAttr<AliasAttr>()) 10341 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10342 DeclApplyPragmaWeak(TUScope, ND, W); 10343 } else { 10344 (void)WeakUndeclaredIdentifiers.insert( 10345 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10346 } 10347} 10348 10349Decl *Sema::getObjCDeclContext() const { 10350 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10351} 10352 10353AvailabilityResult Sema::getCurContextAvailability() const { 10354 const Decl *D = cast<Decl>(getCurLexicalContext()); 10355 // A category implicitly has the availability of the interface. 10356 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10357 D = CatD->getClassInterface(); 10358 10359 return D->getAvailability(); 10360} 10361