SemaDecl.cpp revision 4e4d08403ca5cfd4d558fa2936215d3a4e5a528d
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) { 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); 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); 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); 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 // Merge the attributes 2102 mergeDeclAttributes(New, Old); 2103 2104 // Merge the storage class. 2105 if (Old->getStorageClass() != SC_Extern && 2106 Old->getStorageClass() != SC_None) 2107 New->setStorageClass(Old->getStorageClass()); 2108 2109 // Merge "pure" flag. 2110 if (Old->isPure()) 2111 New->setPure(); 2112 2113 // Merge attributes from the parameters. These can mismatch with K&R 2114 // declarations. 2115 if (New->getNumParams() == Old->getNumParams()) 2116 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2117 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2118 Context); 2119 2120 if (getLangOpts().CPlusPlus) 2121 return MergeCXXFunctionDecl(New, Old); 2122 2123 return false; 2124} 2125 2126 2127void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2128 ObjCMethodDecl *oldMethod) { 2129 // We don't want to merge unavailable and deprecated attributes 2130 // except from interface to implementation. 2131 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2132 2133 // Merge the attributes. 2134 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2135 2136 // Merge attributes from the parameters. 2137 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2138 for (ObjCMethodDecl::param_iterator 2139 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2140 ni != ne; ++ni, ++oi) 2141 mergeParamDeclAttributes(*ni, *oi, Context); 2142 2143 CheckObjCMethodOverride(newMethod, oldMethod, true); 2144} 2145 2146/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2147/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2148/// emitting diagnostics as appropriate. 2149/// 2150/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2151/// to here in AddInitializerToDecl. We can't check them before the initializer 2152/// is attached. 2153void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2154 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2155 return; 2156 2157 QualType MergedT; 2158 if (getLangOpts().CPlusPlus) { 2159 AutoType *AT = New->getType()->getContainedAutoType(); 2160 if (AT && !AT->isDeduced()) { 2161 // We don't know what the new type is until the initializer is attached. 2162 return; 2163 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2164 // These could still be something that needs exception specs checked. 2165 return MergeVarDeclExceptionSpecs(New, Old); 2166 } 2167 // C++ [basic.link]p10: 2168 // [...] the types specified by all declarations referring to a given 2169 // object or function shall be identical, except that declarations for an 2170 // array object can specify array types that differ by the presence or 2171 // absence of a major array bound (8.3.4). 2172 else if (Old->getType()->isIncompleteArrayType() && 2173 New->getType()->isArrayType()) { 2174 CanQual<ArrayType> OldArray 2175 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2176 CanQual<ArrayType> NewArray 2177 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2178 if (OldArray->getElementType() == NewArray->getElementType()) 2179 MergedT = New->getType(); 2180 } else if (Old->getType()->isArrayType() && 2181 New->getType()->isIncompleteArrayType()) { 2182 CanQual<ArrayType> OldArray 2183 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2184 CanQual<ArrayType> NewArray 2185 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2186 if (OldArray->getElementType() == NewArray->getElementType()) 2187 MergedT = Old->getType(); 2188 } else if (New->getType()->isObjCObjectPointerType() 2189 && Old->getType()->isObjCObjectPointerType()) { 2190 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2191 Old->getType()); 2192 } 2193 } else { 2194 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2195 } 2196 if (MergedT.isNull()) { 2197 Diag(New->getLocation(), diag::err_redefinition_different_type) 2198 << New->getDeclName(); 2199 Diag(Old->getLocation(), diag::note_previous_definition); 2200 return New->setInvalidDecl(); 2201 } 2202 New->setType(MergedT); 2203} 2204 2205/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2206/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2207/// situation, merging decls or emitting diagnostics as appropriate. 2208/// 2209/// Tentative definition rules (C99 6.9.2p2) are checked by 2210/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2211/// definitions here, since the initializer hasn't been attached. 2212/// 2213void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2214 // If the new decl is already invalid, don't do any other checking. 2215 if (New->isInvalidDecl()) 2216 return; 2217 2218 // Verify the old decl was also a variable. 2219 VarDecl *Old = 0; 2220 if (!Previous.isSingleResult() || 2221 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2222 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2223 << New->getDeclName(); 2224 Diag(Previous.getRepresentativeDecl()->getLocation(), 2225 diag::note_previous_definition); 2226 return New->setInvalidDecl(); 2227 } 2228 2229 // C++ [class.mem]p1: 2230 // A member shall not be declared twice in the member-specification [...] 2231 // 2232 // Here, we need only consider static data members. 2233 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2234 Diag(New->getLocation(), diag::err_duplicate_member) 2235 << New->getIdentifier(); 2236 Diag(Old->getLocation(), diag::note_previous_declaration); 2237 New->setInvalidDecl(); 2238 } 2239 2240 mergeDeclAttributes(New, Old); 2241 // Warn if an already-declared variable is made a weak_import in a subsequent 2242 // declaration 2243 if (New->getAttr<WeakImportAttr>() && 2244 Old->getStorageClass() == SC_None && 2245 !Old->getAttr<WeakImportAttr>()) { 2246 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2247 Diag(Old->getLocation(), diag::note_previous_definition); 2248 // Remove weak_import attribute on new declaration. 2249 New->dropAttr<WeakImportAttr>(); 2250 } 2251 2252 // Merge the types. 2253 MergeVarDeclTypes(New, Old); 2254 if (New->isInvalidDecl()) 2255 return; 2256 2257 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2258 if (New->getStorageClass() == SC_Static && 2259 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2260 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2261 Diag(Old->getLocation(), diag::note_previous_definition); 2262 return New->setInvalidDecl(); 2263 } 2264 // C99 6.2.2p4: 2265 // For an identifier declared with the storage-class specifier 2266 // extern in a scope in which a prior declaration of that 2267 // identifier is visible,23) if the prior declaration specifies 2268 // internal or external linkage, the linkage of the identifier at 2269 // the later declaration is the same as the linkage specified at 2270 // the prior declaration. If no prior declaration is visible, or 2271 // if the prior declaration specifies no linkage, then the 2272 // identifier has external linkage. 2273 if (New->hasExternalStorage() && Old->hasLinkage()) 2274 /* Okay */; 2275 else if (New->getStorageClass() != SC_Static && 2276 Old->getStorageClass() == SC_Static) { 2277 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2278 Diag(Old->getLocation(), diag::note_previous_definition); 2279 return New->setInvalidDecl(); 2280 } 2281 2282 // Check if extern is followed by non-extern and vice-versa. 2283 if (New->hasExternalStorage() && 2284 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2285 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2286 Diag(Old->getLocation(), diag::note_previous_definition); 2287 return New->setInvalidDecl(); 2288 } 2289 if (Old->hasExternalStorage() && 2290 !New->hasLinkage() && New->isLocalVarDecl()) { 2291 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2292 Diag(Old->getLocation(), diag::note_previous_definition); 2293 return New->setInvalidDecl(); 2294 } 2295 2296 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2297 2298 // FIXME: The test for external storage here seems wrong? We still 2299 // need to check for mismatches. 2300 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2301 // Don't complain about out-of-line definitions of static members. 2302 !(Old->getLexicalDeclContext()->isRecord() && 2303 !New->getLexicalDeclContext()->isRecord())) { 2304 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2305 Diag(Old->getLocation(), diag::note_previous_definition); 2306 return New->setInvalidDecl(); 2307 } 2308 2309 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2310 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2311 Diag(Old->getLocation(), diag::note_previous_definition); 2312 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2313 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2314 Diag(Old->getLocation(), diag::note_previous_definition); 2315 } 2316 2317 // C++ doesn't have tentative definitions, so go right ahead and check here. 2318 const VarDecl *Def; 2319 if (getLangOpts().CPlusPlus && 2320 New->isThisDeclarationADefinition() == VarDecl::Definition && 2321 (Def = Old->getDefinition())) { 2322 Diag(New->getLocation(), diag::err_redefinition) 2323 << New->getDeclName(); 2324 Diag(Def->getLocation(), diag::note_previous_definition); 2325 New->setInvalidDecl(); 2326 return; 2327 } 2328 // c99 6.2.2 P4. 2329 // For an identifier declared with the storage-class specifier extern in a 2330 // scope in which a prior declaration of that identifier is visible, if 2331 // the prior declaration specifies internal or external linkage, the linkage 2332 // of the identifier at the later declaration is the same as the linkage 2333 // specified at the prior declaration. 2334 // FIXME. revisit this code. 2335 if (New->hasExternalStorage() && 2336 Old->getLinkage() == InternalLinkage && 2337 New->getDeclContext() == Old->getDeclContext()) 2338 New->setStorageClass(Old->getStorageClass()); 2339 2340 // Keep a chain of previous declarations. 2341 New->setPreviousDeclaration(Old); 2342 2343 // Inherit access appropriately. 2344 New->setAccess(Old->getAccess()); 2345} 2346 2347/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2348/// no declarator (e.g. "struct foo;") is parsed. 2349Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2350 DeclSpec &DS) { 2351 return ParsedFreeStandingDeclSpec(S, AS, DS, 2352 MultiTemplateParamsArg(*this, 0, 0)); 2353} 2354 2355/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2356/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2357/// parameters to cope with template friend declarations. 2358Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2359 DeclSpec &DS, 2360 MultiTemplateParamsArg TemplateParams) { 2361 Decl *TagD = 0; 2362 TagDecl *Tag = 0; 2363 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2364 DS.getTypeSpecType() == DeclSpec::TST_struct || 2365 DS.getTypeSpecType() == DeclSpec::TST_union || 2366 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2367 TagD = DS.getRepAsDecl(); 2368 2369 if (!TagD) // We probably had an error 2370 return 0; 2371 2372 // Note that the above type specs guarantee that the 2373 // type rep is a Decl, whereas in many of the others 2374 // it's a Type. 2375 if (isa<TagDecl>(TagD)) 2376 Tag = cast<TagDecl>(TagD); 2377 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2378 Tag = CTD->getTemplatedDecl(); 2379 } 2380 2381 if (Tag) { 2382 Tag->setFreeStanding(); 2383 if (Tag->isInvalidDecl()) 2384 return Tag; 2385 } 2386 2387 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2388 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2389 // or incomplete types shall not be restrict-qualified." 2390 if (TypeQuals & DeclSpec::TQ_restrict) 2391 Diag(DS.getRestrictSpecLoc(), 2392 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2393 << DS.getSourceRange(); 2394 } 2395 2396 if (DS.isConstexprSpecified()) { 2397 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2398 // and definitions of functions and variables. 2399 if (Tag) 2400 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2401 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2402 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2403 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2404 else 2405 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2406 // Don't emit warnings after this error. 2407 return TagD; 2408 } 2409 2410 if (DS.isFriendSpecified()) { 2411 // If we're dealing with a decl but not a TagDecl, assume that 2412 // whatever routines created it handled the friendship aspect. 2413 if (TagD && !Tag) 2414 return 0; 2415 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2416 } 2417 2418 // Track whether we warned about the fact that there aren't any 2419 // declarators. 2420 bool emittedWarning = false; 2421 2422 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2423 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2424 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2425 if (getLangOpts().CPlusPlus || 2426 Record->getDeclContext()->isRecord()) 2427 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2428 2429 Diag(DS.getLocStart(), diag::ext_no_declarators) 2430 << DS.getSourceRange(); 2431 emittedWarning = true; 2432 } 2433 } 2434 2435 // Check for Microsoft C extension: anonymous struct. 2436 if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus && 2437 CurContext->isRecord() && 2438 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2439 // Handle 2 kinds of anonymous struct: 2440 // struct STRUCT; 2441 // and 2442 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2443 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2444 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2445 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2446 DS.getRepAsType().get()->isStructureType())) { 2447 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct) 2448 << DS.getSourceRange(); 2449 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2450 } 2451 } 2452 2453 if (getLangOpts().CPlusPlus && 2454 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2455 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2456 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2457 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2458 Diag(Enum->getLocation(), diag::ext_no_declarators) 2459 << DS.getSourceRange(); 2460 emittedWarning = true; 2461 } 2462 2463 // Skip all the checks below if we have a type error. 2464 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2465 2466 if (!DS.isMissingDeclaratorOk()) { 2467 // Warn about typedefs of enums without names, since this is an 2468 // extension in both Microsoft and GNU. 2469 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2470 Tag && isa<EnumDecl>(Tag)) { 2471 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name) 2472 << DS.getSourceRange(); 2473 return Tag; 2474 } 2475 2476 Diag(DS.getLocStart(), diag::ext_no_declarators) 2477 << DS.getSourceRange(); 2478 emittedWarning = true; 2479 } 2480 2481 // We're going to complain about a bunch of spurious specifiers; 2482 // only do this if we're declaring a tag, because otherwise we 2483 // should be getting diag::ext_no_declarators. 2484 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2485 return TagD; 2486 2487 // Note that a linkage-specification sets a storage class, but 2488 // 'extern "C" struct foo;' is actually valid and not theoretically 2489 // useless. 2490 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2491 if (!DS.isExternInLinkageSpec()) 2492 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2493 << DeclSpec::getSpecifierName(scs); 2494 2495 if (DS.isThreadSpecified()) 2496 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2497 if (DS.getTypeQualifiers()) { 2498 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2499 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2500 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2501 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2502 // Restrict is covered above. 2503 } 2504 if (DS.isInlineSpecified()) 2505 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2506 if (DS.isVirtualSpecified()) 2507 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2508 if (DS.isExplicitSpecified()) 2509 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2510 2511 if (DS.isModulePrivateSpecified() && 2512 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2513 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2514 << Tag->getTagKind() 2515 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2516 2517 // Warn about ignored type attributes, for example: 2518 // __attribute__((aligned)) struct A; 2519 // Attributes should be placed after tag to apply to type declaration. 2520 if (!DS.getAttributes().empty()) { 2521 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2522 if (TypeSpecType == DeclSpec::TST_class || 2523 TypeSpecType == DeclSpec::TST_struct || 2524 TypeSpecType == DeclSpec::TST_union || 2525 TypeSpecType == DeclSpec::TST_enum) { 2526 AttributeList* attrs = DS.getAttributes().getList(); 2527 while (attrs) { 2528 Diag(attrs->getScopeLoc(), 2529 diag::warn_declspec_attribute_ignored) 2530 << attrs->getName() 2531 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2532 TypeSpecType == DeclSpec::TST_struct ? 1 : 2533 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2534 attrs = attrs->getNext(); 2535 } 2536 } 2537 } 2538 2539 return TagD; 2540} 2541 2542/// We are trying to inject an anonymous member into the given scope; 2543/// check if there's an existing declaration that can't be overloaded. 2544/// 2545/// \return true if this is a forbidden redeclaration 2546static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2547 Scope *S, 2548 DeclContext *Owner, 2549 DeclarationName Name, 2550 SourceLocation NameLoc, 2551 unsigned diagnostic) { 2552 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2553 Sema::ForRedeclaration); 2554 if (!SemaRef.LookupName(R, S)) return false; 2555 2556 if (R.getAsSingle<TagDecl>()) 2557 return false; 2558 2559 // Pick a representative declaration. 2560 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2561 assert(PrevDecl && "Expected a non-null Decl"); 2562 2563 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2564 return false; 2565 2566 SemaRef.Diag(NameLoc, diagnostic) << Name; 2567 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2568 2569 return true; 2570} 2571 2572/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2573/// anonymous struct or union AnonRecord into the owning context Owner 2574/// and scope S. This routine will be invoked just after we realize 2575/// that an unnamed union or struct is actually an anonymous union or 2576/// struct, e.g., 2577/// 2578/// @code 2579/// union { 2580/// int i; 2581/// float f; 2582/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2583/// // f into the surrounding scope.x 2584/// @endcode 2585/// 2586/// This routine is recursive, injecting the names of nested anonymous 2587/// structs/unions into the owning context and scope as well. 2588static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2589 DeclContext *Owner, 2590 RecordDecl *AnonRecord, 2591 AccessSpecifier AS, 2592 SmallVector<NamedDecl*, 2> &Chaining, 2593 bool MSAnonStruct) { 2594 unsigned diagKind 2595 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2596 : diag::err_anonymous_struct_member_redecl; 2597 2598 bool Invalid = false; 2599 2600 // Look every FieldDecl and IndirectFieldDecl with a name. 2601 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2602 DEnd = AnonRecord->decls_end(); 2603 D != DEnd; ++D) { 2604 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2605 cast<NamedDecl>(*D)->getDeclName()) { 2606 ValueDecl *VD = cast<ValueDecl>(*D); 2607 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2608 VD->getLocation(), diagKind)) { 2609 // C++ [class.union]p2: 2610 // The names of the members of an anonymous union shall be 2611 // distinct from the names of any other entity in the 2612 // scope in which the anonymous union is declared. 2613 Invalid = true; 2614 } else { 2615 // C++ [class.union]p2: 2616 // For the purpose of name lookup, after the anonymous union 2617 // definition, the members of the anonymous union are 2618 // considered to have been defined in the scope in which the 2619 // anonymous union is declared. 2620 unsigned OldChainingSize = Chaining.size(); 2621 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2622 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2623 PE = IF->chain_end(); PI != PE; ++PI) 2624 Chaining.push_back(*PI); 2625 else 2626 Chaining.push_back(VD); 2627 2628 assert(Chaining.size() >= 2); 2629 NamedDecl **NamedChain = 2630 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2631 for (unsigned i = 0; i < Chaining.size(); i++) 2632 NamedChain[i] = Chaining[i]; 2633 2634 IndirectFieldDecl* IndirectField = 2635 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2636 VD->getIdentifier(), VD->getType(), 2637 NamedChain, Chaining.size()); 2638 2639 IndirectField->setAccess(AS); 2640 IndirectField->setImplicit(); 2641 SemaRef.PushOnScopeChains(IndirectField, S); 2642 2643 // That includes picking up the appropriate access specifier. 2644 if (AS != AS_none) IndirectField->setAccess(AS); 2645 2646 Chaining.resize(OldChainingSize); 2647 } 2648 } 2649 } 2650 2651 return Invalid; 2652} 2653 2654/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2655/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2656/// illegal input values are mapped to SC_None. 2657static StorageClass 2658StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2659 switch (StorageClassSpec) { 2660 case DeclSpec::SCS_unspecified: return SC_None; 2661 case DeclSpec::SCS_extern: return SC_Extern; 2662 case DeclSpec::SCS_static: return SC_Static; 2663 case DeclSpec::SCS_auto: return SC_Auto; 2664 case DeclSpec::SCS_register: return SC_Register; 2665 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2666 // Illegal SCSs map to None: error reporting is up to the caller. 2667 case DeclSpec::SCS_mutable: // Fall through. 2668 case DeclSpec::SCS_typedef: return SC_None; 2669 } 2670 llvm_unreachable("unknown storage class specifier"); 2671} 2672 2673/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2674/// a StorageClass. Any error reporting is up to the caller: 2675/// illegal input values are mapped to SC_None. 2676static StorageClass 2677StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2678 switch (StorageClassSpec) { 2679 case DeclSpec::SCS_unspecified: return SC_None; 2680 case DeclSpec::SCS_extern: return SC_Extern; 2681 case DeclSpec::SCS_static: return SC_Static; 2682 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2683 // Illegal SCSs map to None: error reporting is up to the caller. 2684 case DeclSpec::SCS_auto: // Fall through. 2685 case DeclSpec::SCS_mutable: // Fall through. 2686 case DeclSpec::SCS_register: // Fall through. 2687 case DeclSpec::SCS_typedef: return SC_None; 2688 } 2689 llvm_unreachable("unknown storage class specifier"); 2690} 2691 2692/// BuildAnonymousStructOrUnion - Handle the declaration of an 2693/// anonymous structure or union. Anonymous unions are a C++ feature 2694/// (C++ [class.union]) and a C11 feature; anonymous structures 2695/// are a C11 feature and GNU C++ extension. 2696Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2697 AccessSpecifier AS, 2698 RecordDecl *Record) { 2699 DeclContext *Owner = Record->getDeclContext(); 2700 2701 // Diagnose whether this anonymous struct/union is an extension. 2702 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11) 2703 Diag(Record->getLocation(), diag::ext_anonymous_union); 2704 else if (!Record->isUnion() && getLangOpts().CPlusPlus) 2705 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2706 else if (!Record->isUnion() && !getLangOpts().C11) 2707 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2708 2709 // C and C++ require different kinds of checks for anonymous 2710 // structs/unions. 2711 bool Invalid = false; 2712 if (getLangOpts().CPlusPlus) { 2713 const char* PrevSpec = 0; 2714 unsigned DiagID; 2715 if (Record->isUnion()) { 2716 // C++ [class.union]p6: 2717 // Anonymous unions declared in a named namespace or in the 2718 // global namespace shall be declared static. 2719 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2720 (isa<TranslationUnitDecl>(Owner) || 2721 (isa<NamespaceDecl>(Owner) && 2722 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2723 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2724 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2725 2726 // Recover by adding 'static'. 2727 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2728 PrevSpec, DiagID); 2729 } 2730 // C++ [class.union]p6: 2731 // A storage class is not allowed in a declaration of an 2732 // anonymous union in a class scope. 2733 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2734 isa<RecordDecl>(Owner)) { 2735 Diag(DS.getStorageClassSpecLoc(), 2736 diag::err_anonymous_union_with_storage_spec) 2737 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2738 2739 // Recover by removing the storage specifier. 2740 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2741 SourceLocation(), 2742 PrevSpec, DiagID); 2743 } 2744 } 2745 2746 // Ignore const/volatile/restrict qualifiers. 2747 if (DS.getTypeQualifiers()) { 2748 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2749 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2750 << Record->isUnion() << 0 2751 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2752 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2753 Diag(DS.getVolatileSpecLoc(), 2754 diag::ext_anonymous_struct_union_qualified) 2755 << Record->isUnion() << 1 2756 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2757 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2758 Diag(DS.getRestrictSpecLoc(), 2759 diag::ext_anonymous_struct_union_qualified) 2760 << Record->isUnion() << 2 2761 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2762 2763 DS.ClearTypeQualifiers(); 2764 } 2765 2766 // C++ [class.union]p2: 2767 // The member-specification of an anonymous union shall only 2768 // define non-static data members. [Note: nested types and 2769 // functions cannot be declared within an anonymous union. ] 2770 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2771 MemEnd = Record->decls_end(); 2772 Mem != MemEnd; ++Mem) { 2773 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2774 // C++ [class.union]p3: 2775 // An anonymous union shall not have private or protected 2776 // members (clause 11). 2777 assert(FD->getAccess() != AS_none); 2778 if (FD->getAccess() != AS_public) { 2779 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2780 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2781 Invalid = true; 2782 } 2783 2784 // C++ [class.union]p1 2785 // An object of a class with a non-trivial constructor, a non-trivial 2786 // copy constructor, a non-trivial destructor, or a non-trivial copy 2787 // assignment operator cannot be a member of a union, nor can an 2788 // array of such objects. 2789 if (CheckNontrivialField(FD)) 2790 Invalid = true; 2791 } else if ((*Mem)->isImplicit()) { 2792 // Any implicit members are fine. 2793 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2794 // This is a type that showed up in an 2795 // elaborated-type-specifier inside the anonymous struct or 2796 // union, but which actually declares a type outside of the 2797 // anonymous struct or union. It's okay. 2798 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2799 if (!MemRecord->isAnonymousStructOrUnion() && 2800 MemRecord->getDeclName()) { 2801 // Visual C++ allows type definition in anonymous struct or union. 2802 if (getLangOpts().MicrosoftExt) 2803 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2804 << (int)Record->isUnion(); 2805 else { 2806 // This is a nested type declaration. 2807 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2808 << (int)Record->isUnion(); 2809 Invalid = true; 2810 } 2811 } 2812 } else if (isa<AccessSpecDecl>(*Mem)) { 2813 // Any access specifier is fine. 2814 } else { 2815 // We have something that isn't a non-static data 2816 // member. Complain about it. 2817 unsigned DK = diag::err_anonymous_record_bad_member; 2818 if (isa<TypeDecl>(*Mem)) 2819 DK = diag::err_anonymous_record_with_type; 2820 else if (isa<FunctionDecl>(*Mem)) 2821 DK = diag::err_anonymous_record_with_function; 2822 else if (isa<VarDecl>(*Mem)) 2823 DK = diag::err_anonymous_record_with_static; 2824 2825 // Visual C++ allows type definition in anonymous struct or union. 2826 if (getLangOpts().MicrosoftExt && 2827 DK == diag::err_anonymous_record_with_type) 2828 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2829 << (int)Record->isUnion(); 2830 else { 2831 Diag((*Mem)->getLocation(), DK) 2832 << (int)Record->isUnion(); 2833 Invalid = true; 2834 } 2835 } 2836 } 2837 } 2838 2839 if (!Record->isUnion() && !Owner->isRecord()) { 2840 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2841 << (int)getLangOpts().CPlusPlus; 2842 Invalid = true; 2843 } 2844 2845 // Mock up a declarator. 2846 Declarator Dc(DS, Declarator::MemberContext); 2847 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2848 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2849 2850 // Create a declaration for this anonymous struct/union. 2851 NamedDecl *Anon = 0; 2852 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2853 Anon = FieldDecl::Create(Context, OwningClass, 2854 DS.getLocStart(), 2855 Record->getLocation(), 2856 /*IdentifierInfo=*/0, 2857 Context.getTypeDeclType(Record), 2858 TInfo, 2859 /*BitWidth=*/0, /*Mutable=*/false, 2860 /*HasInit=*/false); 2861 Anon->setAccess(AS); 2862 if (getLangOpts().CPlusPlus) 2863 FieldCollector->Add(cast<FieldDecl>(Anon)); 2864 } else { 2865 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2866 assert(SCSpec != DeclSpec::SCS_typedef && 2867 "Parser allowed 'typedef' as storage class VarDecl."); 2868 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2869 if (SCSpec == DeclSpec::SCS_mutable) { 2870 // mutable can only appear on non-static class members, so it's always 2871 // an error here 2872 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2873 Invalid = true; 2874 SC = SC_None; 2875 } 2876 SCSpec = DS.getStorageClassSpecAsWritten(); 2877 VarDecl::StorageClass SCAsWritten 2878 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2879 2880 Anon = VarDecl::Create(Context, Owner, 2881 DS.getLocStart(), 2882 Record->getLocation(), /*IdentifierInfo=*/0, 2883 Context.getTypeDeclType(Record), 2884 TInfo, SC, SCAsWritten); 2885 2886 // Default-initialize the implicit variable. This initialization will be 2887 // trivial in almost all cases, except if a union member has an in-class 2888 // initializer: 2889 // union { int n = 0; }; 2890 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2891 } 2892 Anon->setImplicit(); 2893 2894 // Add the anonymous struct/union object to the current 2895 // context. We'll be referencing this object when we refer to one of 2896 // its members. 2897 Owner->addDecl(Anon); 2898 2899 // Inject the members of the anonymous struct/union into the owning 2900 // context and into the identifier resolver chain for name lookup 2901 // purposes. 2902 SmallVector<NamedDecl*, 2> Chain; 2903 Chain.push_back(Anon); 2904 2905 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2906 Chain, false)) 2907 Invalid = true; 2908 2909 // Mark this as an anonymous struct/union type. Note that we do not 2910 // do this until after we have already checked and injected the 2911 // members of this anonymous struct/union type, because otherwise 2912 // the members could be injected twice: once by DeclContext when it 2913 // builds its lookup table, and once by 2914 // InjectAnonymousStructOrUnionMembers. 2915 Record->setAnonymousStructOrUnion(true); 2916 2917 if (Invalid) 2918 Anon->setInvalidDecl(); 2919 2920 return Anon; 2921} 2922 2923/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2924/// Microsoft C anonymous structure. 2925/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2926/// Example: 2927/// 2928/// struct A { int a; }; 2929/// struct B { struct A; int b; }; 2930/// 2931/// void foo() { 2932/// B var; 2933/// var.a = 3; 2934/// } 2935/// 2936Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2937 RecordDecl *Record) { 2938 2939 // If there is no Record, get the record via the typedef. 2940 if (!Record) 2941 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2942 2943 // Mock up a declarator. 2944 Declarator Dc(DS, Declarator::TypeNameContext); 2945 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2946 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2947 2948 // Create a declaration for this anonymous struct. 2949 NamedDecl* Anon = FieldDecl::Create(Context, 2950 cast<RecordDecl>(CurContext), 2951 DS.getLocStart(), 2952 DS.getLocStart(), 2953 /*IdentifierInfo=*/0, 2954 Context.getTypeDeclType(Record), 2955 TInfo, 2956 /*BitWidth=*/0, /*Mutable=*/false, 2957 /*HasInit=*/false); 2958 Anon->setImplicit(); 2959 2960 // Add the anonymous struct object to the current context. 2961 CurContext->addDecl(Anon); 2962 2963 // Inject the members of the anonymous struct into the current 2964 // context and into the identifier resolver chain for name lookup 2965 // purposes. 2966 SmallVector<NamedDecl*, 2> Chain; 2967 Chain.push_back(Anon); 2968 2969 RecordDecl *RecordDef = Record->getDefinition(); 2970 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2971 RecordDef, AS_none, 2972 Chain, true)) 2973 Anon->setInvalidDecl(); 2974 2975 return Anon; 2976} 2977 2978/// GetNameForDeclarator - Determine the full declaration name for the 2979/// given Declarator. 2980DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2981 return GetNameFromUnqualifiedId(D.getName()); 2982} 2983 2984/// \brief Retrieves the declaration name from a parsed unqualified-id. 2985DeclarationNameInfo 2986Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2987 DeclarationNameInfo NameInfo; 2988 NameInfo.setLoc(Name.StartLocation); 2989 2990 switch (Name.getKind()) { 2991 2992 case UnqualifiedId::IK_ImplicitSelfParam: 2993 case UnqualifiedId::IK_Identifier: 2994 NameInfo.setName(Name.Identifier); 2995 NameInfo.setLoc(Name.StartLocation); 2996 return NameInfo; 2997 2998 case UnqualifiedId::IK_OperatorFunctionId: 2999 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 3000 Name.OperatorFunctionId.Operator)); 3001 NameInfo.setLoc(Name.StartLocation); 3002 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 3003 = Name.OperatorFunctionId.SymbolLocations[0]; 3004 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 3005 = Name.EndLocation.getRawEncoding(); 3006 return NameInfo; 3007 3008 case UnqualifiedId::IK_LiteralOperatorId: 3009 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 3010 Name.Identifier)); 3011 NameInfo.setLoc(Name.StartLocation); 3012 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3013 return NameInfo; 3014 3015 case UnqualifiedId::IK_ConversionFunctionId: { 3016 TypeSourceInfo *TInfo; 3017 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3018 if (Ty.isNull()) 3019 return DeclarationNameInfo(); 3020 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3021 Context.getCanonicalType(Ty))); 3022 NameInfo.setLoc(Name.StartLocation); 3023 NameInfo.setNamedTypeInfo(TInfo); 3024 return NameInfo; 3025 } 3026 3027 case UnqualifiedId::IK_ConstructorName: { 3028 TypeSourceInfo *TInfo; 3029 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3030 if (Ty.isNull()) 3031 return DeclarationNameInfo(); 3032 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3033 Context.getCanonicalType(Ty))); 3034 NameInfo.setLoc(Name.StartLocation); 3035 NameInfo.setNamedTypeInfo(TInfo); 3036 return NameInfo; 3037 } 3038 3039 case UnqualifiedId::IK_ConstructorTemplateId: { 3040 // In well-formed code, we can only have a constructor 3041 // template-id that refers to the current context, so go there 3042 // to find the actual type being constructed. 3043 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3044 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3045 return DeclarationNameInfo(); 3046 3047 // Determine the type of the class being constructed. 3048 QualType CurClassType = Context.getTypeDeclType(CurClass); 3049 3050 // FIXME: Check two things: that the template-id names the same type as 3051 // CurClassType, and that the template-id does not occur when the name 3052 // was qualified. 3053 3054 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3055 Context.getCanonicalType(CurClassType))); 3056 NameInfo.setLoc(Name.StartLocation); 3057 // FIXME: should we retrieve TypeSourceInfo? 3058 NameInfo.setNamedTypeInfo(0); 3059 return NameInfo; 3060 } 3061 3062 case UnqualifiedId::IK_DestructorName: { 3063 TypeSourceInfo *TInfo; 3064 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3065 if (Ty.isNull()) 3066 return DeclarationNameInfo(); 3067 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3068 Context.getCanonicalType(Ty))); 3069 NameInfo.setLoc(Name.StartLocation); 3070 NameInfo.setNamedTypeInfo(TInfo); 3071 return NameInfo; 3072 } 3073 3074 case UnqualifiedId::IK_TemplateId: { 3075 TemplateName TName = Name.TemplateId->Template.get(); 3076 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3077 return Context.getNameForTemplate(TName, TNameLoc); 3078 } 3079 3080 } // switch (Name.getKind()) 3081 3082 llvm_unreachable("Unknown name kind"); 3083} 3084 3085static QualType getCoreType(QualType Ty) { 3086 do { 3087 if (Ty->isPointerType() || Ty->isReferenceType()) 3088 Ty = Ty->getPointeeType(); 3089 else if (Ty->isArrayType()) 3090 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3091 else 3092 return Ty.withoutLocalFastQualifiers(); 3093 } while (true); 3094} 3095 3096/// hasSimilarParameters - Determine whether the C++ functions Declaration 3097/// and Definition have "nearly" matching parameters. This heuristic is 3098/// used to improve diagnostics in the case where an out-of-line function 3099/// definition doesn't match any declaration within the class or namespace. 3100/// Also sets Params to the list of indices to the parameters that differ 3101/// between the declaration and the definition. If hasSimilarParameters 3102/// returns true and Params is empty, then all of the parameters match. 3103static bool hasSimilarParameters(ASTContext &Context, 3104 FunctionDecl *Declaration, 3105 FunctionDecl *Definition, 3106 llvm::SmallVectorImpl<unsigned> &Params) { 3107 Params.clear(); 3108 if (Declaration->param_size() != Definition->param_size()) 3109 return false; 3110 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3111 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3112 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3113 3114 // The parameter types are identical 3115 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3116 continue; 3117 3118 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3119 QualType DefParamBaseTy = getCoreType(DefParamTy); 3120 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3121 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3122 3123 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3124 (DeclTyName && DeclTyName == DefTyName)) 3125 Params.push_back(Idx); 3126 else // The two parameters aren't even close 3127 return false; 3128 } 3129 3130 return true; 3131} 3132 3133/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3134/// declarator needs to be rebuilt in the current instantiation. 3135/// Any bits of declarator which appear before the name are valid for 3136/// consideration here. That's specifically the type in the decl spec 3137/// and the base type in any member-pointer chunks. 3138static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3139 DeclarationName Name) { 3140 // The types we specifically need to rebuild are: 3141 // - typenames, typeofs, and decltypes 3142 // - types which will become injected class names 3143 // Of course, we also need to rebuild any type referencing such a 3144 // type. It's safest to just say "dependent", but we call out a 3145 // few cases here. 3146 3147 DeclSpec &DS = D.getMutableDeclSpec(); 3148 switch (DS.getTypeSpecType()) { 3149 case DeclSpec::TST_typename: 3150 case DeclSpec::TST_typeofType: 3151 case DeclSpec::TST_decltype: 3152 case DeclSpec::TST_underlyingType: 3153 case DeclSpec::TST_atomic: { 3154 // Grab the type from the parser. 3155 TypeSourceInfo *TSI = 0; 3156 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3157 if (T.isNull() || !T->isDependentType()) break; 3158 3159 // Make sure there's a type source info. This isn't really much 3160 // of a waste; most dependent types should have type source info 3161 // attached already. 3162 if (!TSI) 3163 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3164 3165 // Rebuild the type in the current instantiation. 3166 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3167 if (!TSI) return true; 3168 3169 // Store the new type back in the decl spec. 3170 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3171 DS.UpdateTypeRep(LocType); 3172 break; 3173 } 3174 3175 case DeclSpec::TST_typeofExpr: { 3176 Expr *E = DS.getRepAsExpr(); 3177 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3178 if (Result.isInvalid()) return true; 3179 DS.UpdateExprRep(Result.get()); 3180 break; 3181 } 3182 3183 default: 3184 // Nothing to do for these decl specs. 3185 break; 3186 } 3187 3188 // It doesn't matter what order we do this in. 3189 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3190 DeclaratorChunk &Chunk = D.getTypeObject(I); 3191 3192 // The only type information in the declarator which can come 3193 // before the declaration name is the base type of a member 3194 // pointer. 3195 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3196 continue; 3197 3198 // Rebuild the scope specifier in-place. 3199 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3200 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3201 return true; 3202 } 3203 3204 return false; 3205} 3206 3207Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3208 D.setFunctionDefinitionKind(FDK_Declaration); 3209 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3210 3211 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3212 Dcl->getDeclContext()->isFileContext()) 3213 Dcl->setTopLevelDeclInObjCContainer(); 3214 3215 return Dcl; 3216} 3217 3218/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3219/// If T is the name of a class, then each of the following shall have a 3220/// name different from T: 3221/// - every static data member of class T; 3222/// - every member function of class T 3223/// - every member of class T that is itself a type; 3224/// \returns true if the declaration name violates these rules. 3225bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3226 DeclarationNameInfo NameInfo) { 3227 DeclarationName Name = NameInfo.getName(); 3228 3229 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3230 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3231 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3232 return true; 3233 } 3234 3235 return false; 3236} 3237 3238Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3239 MultiTemplateParamsArg TemplateParamLists) { 3240 // TODO: consider using NameInfo for diagnostic. 3241 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3242 DeclarationName Name = NameInfo.getName(); 3243 3244 // All of these full declarators require an identifier. If it doesn't have 3245 // one, the ParsedFreeStandingDeclSpec action should be used. 3246 if (!Name) { 3247 if (!D.isInvalidType()) // Reject this if we think it is valid. 3248 Diag(D.getDeclSpec().getLocStart(), 3249 diag::err_declarator_need_ident) 3250 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3251 return 0; 3252 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3253 return 0; 3254 3255 // The scope passed in may not be a decl scope. Zip up the scope tree until 3256 // we find one that is. 3257 while ((S->getFlags() & Scope::DeclScope) == 0 || 3258 (S->getFlags() & Scope::TemplateParamScope) != 0) 3259 S = S->getParent(); 3260 3261 DeclContext *DC = CurContext; 3262 if (D.getCXXScopeSpec().isInvalid()) 3263 D.setInvalidType(); 3264 else if (D.getCXXScopeSpec().isSet()) { 3265 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3266 UPPC_DeclarationQualifier)) 3267 return 0; 3268 3269 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3270 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3271 if (!DC) { 3272 // If we could not compute the declaration context, it's because the 3273 // declaration context is dependent but does not refer to a class, 3274 // class template, or class template partial specialization. Complain 3275 // and return early, to avoid the coming semantic disaster. 3276 Diag(D.getIdentifierLoc(), 3277 diag::err_template_qualified_declarator_no_match) 3278 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3279 << D.getCXXScopeSpec().getRange(); 3280 return 0; 3281 } 3282 bool IsDependentContext = DC->isDependentContext(); 3283 3284 if (!IsDependentContext && 3285 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3286 return 0; 3287 3288 if (isa<CXXRecordDecl>(DC)) { 3289 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3290 Diag(D.getIdentifierLoc(), 3291 diag::err_member_def_undefined_record) 3292 << Name << DC << D.getCXXScopeSpec().getRange(); 3293 D.setInvalidType(); 3294 } else if (isa<CXXRecordDecl>(CurContext) && 3295 !D.getDeclSpec().isFriendSpecified()) { 3296 // The user provided a superfluous scope specifier inside a class 3297 // definition: 3298 // 3299 // class X { 3300 // void X::f(); 3301 // }; 3302 if (CurContext->Equals(DC)) { 3303 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3304 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3305 } else { 3306 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3307 << Name << D.getCXXScopeSpec().getRange(); 3308 3309 // C++ constructors and destructors with incorrect scopes can break 3310 // our AST invariants by having the wrong underlying types. If 3311 // that's the case, then drop this declaration entirely. 3312 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3313 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3314 !Context.hasSameType(Name.getCXXNameType(), 3315 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3316 return 0; 3317 } 3318 3319 // Pretend that this qualifier was not here. 3320 D.getCXXScopeSpec().clear(); 3321 } 3322 } 3323 3324 // Check whether we need to rebuild the type of the given 3325 // declaration in the current instantiation. 3326 if (EnteringContext && IsDependentContext && 3327 TemplateParamLists.size() != 0) { 3328 ContextRAII SavedContext(*this, DC); 3329 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3330 D.setInvalidType(); 3331 } 3332 } 3333 3334 if (DiagnoseClassNameShadow(DC, NameInfo)) 3335 // If this is a typedef, we'll end up spewing multiple diagnostics. 3336 // Just return early; it's safer. 3337 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3338 return 0; 3339 3340 NamedDecl *New; 3341 3342 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3343 QualType R = TInfo->getType(); 3344 3345 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3346 UPPC_DeclarationType)) 3347 D.setInvalidType(); 3348 3349 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3350 ForRedeclaration); 3351 3352 // See if this is a redefinition of a variable in the same scope. 3353 if (!D.getCXXScopeSpec().isSet()) { 3354 bool IsLinkageLookup = false; 3355 3356 // If the declaration we're planning to build will be a function 3357 // or object with linkage, then look for another declaration with 3358 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3359 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3360 /* Do nothing*/; 3361 else if (R->isFunctionType()) { 3362 if (CurContext->isFunctionOrMethod() || 3363 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3364 IsLinkageLookup = true; 3365 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3366 IsLinkageLookup = true; 3367 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3368 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3369 IsLinkageLookup = true; 3370 3371 if (IsLinkageLookup) 3372 Previous.clear(LookupRedeclarationWithLinkage); 3373 3374 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3375 } else { // Something like "int foo::x;" 3376 LookupQualifiedName(Previous, DC); 3377 3378 // Don't consider using declarations as previous declarations for 3379 // out-of-line members. 3380 RemoveUsingDecls(Previous); 3381 3382 // C++ 7.3.1.2p2: 3383 // Members (including explicit specializations of templates) of a named 3384 // namespace can also be defined outside that namespace by explicit 3385 // qualification of the name being defined, provided that the entity being 3386 // defined was already declared in the namespace and the definition appears 3387 // after the point of declaration in a namespace that encloses the 3388 // declarations namespace. 3389 // 3390 // Note that we only check the context at this point. We don't yet 3391 // have enough information to make sure that PrevDecl is actually 3392 // the declaration we want to match. For example, given: 3393 // 3394 // class X { 3395 // void f(); 3396 // void f(float); 3397 // }; 3398 // 3399 // void X::f(int) { } // ill-formed 3400 // 3401 // In this case, PrevDecl will point to the overload set 3402 // containing the two f's declared in X, but neither of them 3403 // matches. 3404 3405 // First check whether we named the global scope. 3406 if (isa<TranslationUnitDecl>(DC)) { 3407 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3408 << Name << D.getCXXScopeSpec().getRange(); 3409 } else { 3410 DeclContext *Cur = CurContext; 3411 while (isa<LinkageSpecDecl>(Cur)) 3412 Cur = Cur->getParent(); 3413 if (!Cur->Encloses(DC)) { 3414 // The qualifying scope doesn't enclose the original declaration. 3415 // Emit diagnostic based on current scope. 3416 SourceLocation L = D.getIdentifierLoc(); 3417 SourceRange R = D.getCXXScopeSpec().getRange(); 3418 if (isa<FunctionDecl>(Cur)) 3419 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3420 else 3421 Diag(L, diag::err_invalid_declarator_scope) 3422 << Name << cast<NamedDecl>(DC) << R; 3423 D.setInvalidType(); 3424 } 3425 3426 // C++11 8.3p1: 3427 // ... "The nested-name-specifier of the qualified declarator-id shall 3428 // not begin with a decltype-specifer" 3429 NestedNameSpecifierLoc SpecLoc = 3430 D.getCXXScopeSpec().getWithLocInContext(Context); 3431 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3432 "NestedNameSpecifierLoc"); 3433 while (SpecLoc.getPrefix()) 3434 SpecLoc = SpecLoc.getPrefix(); 3435 if (dyn_cast_or_null<DecltypeType>( 3436 SpecLoc.getNestedNameSpecifier()->getAsType())) 3437 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3438 << SpecLoc.getTypeLoc().getSourceRange(); 3439 } 3440 } 3441 3442 if (Previous.isSingleResult() && 3443 Previous.getFoundDecl()->isTemplateParameter()) { 3444 // Maybe we will complain about the shadowed template parameter. 3445 if (!D.isInvalidType()) 3446 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3447 Previous.getFoundDecl()); 3448 3449 // Just pretend that we didn't see the previous declaration. 3450 Previous.clear(); 3451 } 3452 3453 // In C++, the previous declaration we find might be a tag type 3454 // (class or enum). In this case, the new declaration will hide the 3455 // tag type. Note that this does does not apply if we're declaring a 3456 // typedef (C++ [dcl.typedef]p4). 3457 if (Previous.isSingleTagDecl() && 3458 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3459 Previous.clear(); 3460 3461 bool AddToScope = true; 3462 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3463 if (TemplateParamLists.size()) { 3464 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3465 return 0; 3466 } 3467 3468 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3469 } else if (R->isFunctionType()) { 3470 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3471 move(TemplateParamLists), 3472 AddToScope); 3473 } else { 3474 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3475 move(TemplateParamLists)); 3476 } 3477 3478 if (New == 0) 3479 return 0; 3480 3481 // If this has an identifier and is not an invalid redeclaration or 3482 // function template specialization, add it to the scope stack. 3483 if (New->getDeclName() && AddToScope && 3484 !(D.isRedeclaration() && New->isInvalidDecl())) 3485 PushOnScopeChains(New, S); 3486 3487 return New; 3488} 3489 3490/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3491/// types into constant array types in certain situations which would otherwise 3492/// be errors (for GCC compatibility). 3493static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3494 ASTContext &Context, 3495 bool &SizeIsNegative, 3496 llvm::APSInt &Oversized) { 3497 // This method tries to turn a variable array into a constant 3498 // array even when the size isn't an ICE. This is necessary 3499 // for compatibility with code that depends on gcc's buggy 3500 // constant expression folding, like struct {char x[(int)(char*)2];} 3501 SizeIsNegative = false; 3502 Oversized = 0; 3503 3504 if (T->isDependentType()) 3505 return QualType(); 3506 3507 QualifierCollector Qs; 3508 const Type *Ty = Qs.strip(T); 3509 3510 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3511 QualType Pointee = PTy->getPointeeType(); 3512 QualType FixedType = 3513 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3514 Oversized); 3515 if (FixedType.isNull()) return FixedType; 3516 FixedType = Context.getPointerType(FixedType); 3517 return Qs.apply(Context, FixedType); 3518 } 3519 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3520 QualType Inner = PTy->getInnerType(); 3521 QualType FixedType = 3522 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3523 Oversized); 3524 if (FixedType.isNull()) return FixedType; 3525 FixedType = Context.getParenType(FixedType); 3526 return Qs.apply(Context, FixedType); 3527 } 3528 3529 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3530 if (!VLATy) 3531 return QualType(); 3532 // FIXME: We should probably handle this case 3533 if (VLATy->getElementType()->isVariablyModifiedType()) 3534 return QualType(); 3535 3536 llvm::APSInt Res; 3537 if (!VLATy->getSizeExpr() || 3538 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3539 return QualType(); 3540 3541 // Check whether the array size is negative. 3542 if (Res.isSigned() && Res.isNegative()) { 3543 SizeIsNegative = true; 3544 return QualType(); 3545 } 3546 3547 // Check whether the array is too large to be addressed. 3548 unsigned ActiveSizeBits 3549 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3550 Res); 3551 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3552 Oversized = Res; 3553 return QualType(); 3554 } 3555 3556 return Context.getConstantArrayType(VLATy->getElementType(), 3557 Res, ArrayType::Normal, 0); 3558} 3559 3560/// \brief Register the given locally-scoped external C declaration so 3561/// that it can be found later for redeclarations 3562void 3563Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3564 const LookupResult &Previous, 3565 Scope *S) { 3566 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3567 "Decl is not a locally-scoped decl!"); 3568 // Note that we have a locally-scoped external with this name. 3569 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3570 3571 if (!Previous.isSingleResult()) 3572 return; 3573 3574 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3575 3576 // If there was a previous declaration of this variable, it may be 3577 // in our identifier chain. Update the identifier chain with the new 3578 // declaration. 3579 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3580 // The previous declaration was found on the identifer resolver 3581 // chain, so remove it from its scope. 3582 3583 if (S->isDeclScope(PrevDecl)) { 3584 // Special case for redeclarations in the SAME scope. 3585 // Because this declaration is going to be added to the identifier chain 3586 // later, we should temporarily take it OFF the chain. 3587 IdResolver.RemoveDecl(ND); 3588 3589 } else { 3590 // Find the scope for the original declaration. 3591 while (S && !S->isDeclScope(PrevDecl)) 3592 S = S->getParent(); 3593 } 3594 3595 if (S) 3596 S->RemoveDecl(PrevDecl); 3597 } 3598} 3599 3600llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3601Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3602 if (ExternalSource) { 3603 // Load locally-scoped external decls from the external source. 3604 SmallVector<NamedDecl *, 4> Decls; 3605 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3606 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3607 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3608 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3609 if (Pos == LocallyScopedExternalDecls.end()) 3610 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3611 } 3612 } 3613 3614 return LocallyScopedExternalDecls.find(Name); 3615} 3616 3617/// \brief Diagnose function specifiers on a declaration of an identifier that 3618/// does not identify a function. 3619void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3620 // FIXME: We should probably indicate the identifier in question to avoid 3621 // confusion for constructs like "inline int a(), b;" 3622 if (D.getDeclSpec().isInlineSpecified()) 3623 Diag(D.getDeclSpec().getInlineSpecLoc(), 3624 diag::err_inline_non_function); 3625 3626 if (D.getDeclSpec().isVirtualSpecified()) 3627 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3628 diag::err_virtual_non_function); 3629 3630 if (D.getDeclSpec().isExplicitSpecified()) 3631 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3632 diag::err_explicit_non_function); 3633} 3634 3635NamedDecl* 3636Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3637 TypeSourceInfo *TInfo, LookupResult &Previous) { 3638 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3639 if (D.getCXXScopeSpec().isSet()) { 3640 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3641 << D.getCXXScopeSpec().getRange(); 3642 D.setInvalidType(); 3643 // Pretend we didn't see the scope specifier. 3644 DC = CurContext; 3645 Previous.clear(); 3646 } 3647 3648 if (getLangOpts().CPlusPlus) { 3649 // Check that there are no default arguments (C++ only). 3650 CheckExtraCXXDefaultArguments(D); 3651 } 3652 3653 DiagnoseFunctionSpecifiers(D); 3654 3655 if (D.getDeclSpec().isThreadSpecified()) 3656 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3657 if (D.getDeclSpec().isConstexprSpecified()) 3658 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3659 << 1; 3660 3661 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3662 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3663 << D.getName().getSourceRange(); 3664 return 0; 3665 } 3666 3667 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3668 if (!NewTD) return 0; 3669 3670 // Handle attributes prior to checking for duplicates in MergeVarDecl 3671 ProcessDeclAttributes(S, NewTD, D); 3672 3673 CheckTypedefForVariablyModifiedType(S, NewTD); 3674 3675 bool Redeclaration = D.isRedeclaration(); 3676 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3677 D.setRedeclaration(Redeclaration); 3678 return ND; 3679} 3680 3681void 3682Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3683 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3684 // then it shall have block scope. 3685 // Note that variably modified types must be fixed before merging the decl so 3686 // that redeclarations will match. 3687 QualType T = NewTD->getUnderlyingType(); 3688 if (T->isVariablyModifiedType()) { 3689 getCurFunction()->setHasBranchProtectedScope(); 3690 3691 if (S->getFnParent() == 0) { 3692 bool SizeIsNegative; 3693 llvm::APSInt Oversized; 3694 QualType FixedTy = 3695 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3696 Oversized); 3697 if (!FixedTy.isNull()) { 3698 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3699 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3700 } else { 3701 if (SizeIsNegative) 3702 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3703 else if (T->isVariableArrayType()) 3704 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3705 else if (Oversized.getBoolValue()) 3706 Diag(NewTD->getLocation(), diag::err_array_too_large) 3707 << Oversized.toString(10); 3708 else 3709 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3710 NewTD->setInvalidDecl(); 3711 } 3712 } 3713 } 3714} 3715 3716 3717/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3718/// declares a typedef-name, either using the 'typedef' type specifier or via 3719/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3720NamedDecl* 3721Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3722 LookupResult &Previous, bool &Redeclaration) { 3723 // Merge the decl with the existing one if appropriate. If the decl is 3724 // in an outer scope, it isn't the same thing. 3725 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3726 /*ExplicitInstantiationOrSpecialization=*/false); 3727 if (!Previous.empty()) { 3728 Redeclaration = true; 3729 MergeTypedefNameDecl(NewTD, Previous); 3730 } 3731 3732 // If this is the C FILE type, notify the AST context. 3733 if (IdentifierInfo *II = NewTD->getIdentifier()) 3734 if (!NewTD->isInvalidDecl() && 3735 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3736 if (II->isStr("FILE")) 3737 Context.setFILEDecl(NewTD); 3738 else if (II->isStr("jmp_buf")) 3739 Context.setjmp_bufDecl(NewTD); 3740 else if (II->isStr("sigjmp_buf")) 3741 Context.setsigjmp_bufDecl(NewTD); 3742 else if (II->isStr("ucontext_t")) 3743 Context.setucontext_tDecl(NewTD); 3744 else if (II->isStr("__builtin_va_list")) 3745 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3746 } 3747 3748 return NewTD; 3749} 3750 3751/// \brief Determines whether the given declaration is an out-of-scope 3752/// previous declaration. 3753/// 3754/// This routine should be invoked when name lookup has found a 3755/// previous declaration (PrevDecl) that is not in the scope where a 3756/// new declaration by the same name is being introduced. If the new 3757/// declaration occurs in a local scope, previous declarations with 3758/// linkage may still be considered previous declarations (C99 3759/// 6.2.2p4-5, C++ [basic.link]p6). 3760/// 3761/// \param PrevDecl the previous declaration found by name 3762/// lookup 3763/// 3764/// \param DC the context in which the new declaration is being 3765/// declared. 3766/// 3767/// \returns true if PrevDecl is an out-of-scope previous declaration 3768/// for a new delcaration with the same name. 3769static bool 3770isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3771 ASTContext &Context) { 3772 if (!PrevDecl) 3773 return false; 3774 3775 if (!PrevDecl->hasLinkage()) 3776 return false; 3777 3778 if (Context.getLangOpts().CPlusPlus) { 3779 // C++ [basic.link]p6: 3780 // If there is a visible declaration of an entity with linkage 3781 // having the same name and type, ignoring entities declared 3782 // outside the innermost enclosing namespace scope, the block 3783 // scope declaration declares that same entity and receives the 3784 // linkage of the previous declaration. 3785 DeclContext *OuterContext = DC->getRedeclContext(); 3786 if (!OuterContext->isFunctionOrMethod()) 3787 // This rule only applies to block-scope declarations. 3788 return false; 3789 3790 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3791 if (PrevOuterContext->isRecord()) 3792 // We found a member function: ignore it. 3793 return false; 3794 3795 // Find the innermost enclosing namespace for the new and 3796 // previous declarations. 3797 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3798 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3799 3800 // The previous declaration is in a different namespace, so it 3801 // isn't the same function. 3802 if (!OuterContext->Equals(PrevOuterContext)) 3803 return false; 3804 } 3805 3806 return true; 3807} 3808 3809static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3810 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3811 if (!SS.isSet()) return; 3812 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3813} 3814 3815bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3816 QualType type = decl->getType(); 3817 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3818 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3819 // Various kinds of declaration aren't allowed to be __autoreleasing. 3820 unsigned kind = -1U; 3821 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3822 if (var->hasAttr<BlocksAttr>()) 3823 kind = 0; // __block 3824 else if (!var->hasLocalStorage()) 3825 kind = 1; // global 3826 } else if (isa<ObjCIvarDecl>(decl)) { 3827 kind = 3; // ivar 3828 } else if (isa<FieldDecl>(decl)) { 3829 kind = 2; // field 3830 } 3831 3832 if (kind != -1U) { 3833 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3834 << kind; 3835 } 3836 } else if (lifetime == Qualifiers::OCL_None) { 3837 // Try to infer lifetime. 3838 if (!type->isObjCLifetimeType()) 3839 return false; 3840 3841 lifetime = type->getObjCARCImplicitLifetime(); 3842 type = Context.getLifetimeQualifiedType(type, lifetime); 3843 decl->setType(type); 3844 } 3845 3846 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3847 // Thread-local variables cannot have lifetime. 3848 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3849 var->isThreadSpecified()) { 3850 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3851 << var->getType(); 3852 return true; 3853 } 3854 } 3855 3856 return false; 3857} 3858 3859NamedDecl* 3860Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3861 TypeSourceInfo *TInfo, LookupResult &Previous, 3862 MultiTemplateParamsArg TemplateParamLists) { 3863 QualType R = TInfo->getType(); 3864 DeclarationName Name = GetNameForDeclarator(D).getName(); 3865 3866 // Check that there are no default arguments (C++ only). 3867 if (getLangOpts().CPlusPlus) 3868 CheckExtraCXXDefaultArguments(D); 3869 3870 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3871 assert(SCSpec != DeclSpec::SCS_typedef && 3872 "Parser allowed 'typedef' as storage class VarDecl."); 3873 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3874 if (SCSpec == DeclSpec::SCS_mutable) { 3875 // mutable can only appear on non-static class members, so it's always 3876 // an error here 3877 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3878 D.setInvalidType(); 3879 SC = SC_None; 3880 } 3881 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3882 VarDecl::StorageClass SCAsWritten 3883 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3884 3885 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3886 if (!II) { 3887 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3888 << Name; 3889 return 0; 3890 } 3891 3892 DiagnoseFunctionSpecifiers(D); 3893 3894 if (!DC->isRecord() && S->getFnParent() == 0) { 3895 // C99 6.9p2: The storage-class specifiers auto and register shall not 3896 // appear in the declaration specifiers in an external declaration. 3897 if (SC == SC_Auto || SC == SC_Register) { 3898 3899 // If this is a register variable with an asm label specified, then this 3900 // is a GNU extension. 3901 if (SC == SC_Register && D.getAsmLabel()) 3902 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3903 else 3904 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3905 D.setInvalidType(); 3906 } 3907 } 3908 3909 if (getLangOpts().OpenCL) { 3910 // Set up the special work-group-local storage class for variables in the 3911 // OpenCL __local address space. 3912 if (R.getAddressSpace() == LangAS::opencl_local) 3913 SC = SC_OpenCLWorkGroupLocal; 3914 } 3915 3916 bool isExplicitSpecialization = false; 3917 VarDecl *NewVD; 3918 if (!getLangOpts().CPlusPlus) { 3919 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 3920 D.getIdentifierLoc(), II, 3921 R, TInfo, SC, SCAsWritten); 3922 3923 if (D.isInvalidType()) 3924 NewVD->setInvalidDecl(); 3925 } else { 3926 if (DC->isRecord() && !CurContext->isRecord()) { 3927 // This is an out-of-line definition of a static data member. 3928 if (SC == SC_Static) { 3929 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3930 diag::err_static_out_of_line) 3931 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3932 } else if (SC == SC_None) 3933 SC = SC_Static; 3934 } 3935 if (SC == SC_Static && CurContext->isRecord()) { 3936 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3937 if (RD->isLocalClass()) 3938 Diag(D.getIdentifierLoc(), 3939 diag::err_static_data_member_not_allowed_in_local_class) 3940 << Name << RD->getDeclName(); 3941 3942 // C++98 [class.union]p1: If a union contains a static data member, 3943 // the program is ill-formed. C++11 drops this restriction. 3944 if (RD->isUnion()) 3945 Diag(D.getIdentifierLoc(), 3946 getLangOpts().CPlusPlus0x 3947 ? diag::warn_cxx98_compat_static_data_member_in_union 3948 : diag::ext_static_data_member_in_union) << Name; 3949 // We conservatively disallow static data members in anonymous structs. 3950 else if (!RD->getDeclName()) 3951 Diag(D.getIdentifierLoc(), 3952 diag::err_static_data_member_not_allowed_in_anon_struct) 3953 << Name << RD->isUnion(); 3954 } 3955 } 3956 3957 // Match up the template parameter lists with the scope specifier, then 3958 // determine whether we have a template or a template specialization. 3959 isExplicitSpecialization = false; 3960 bool Invalid = false; 3961 if (TemplateParameterList *TemplateParams 3962 = MatchTemplateParametersToScopeSpecifier( 3963 D.getDeclSpec().getLocStart(), 3964 D.getIdentifierLoc(), 3965 D.getCXXScopeSpec(), 3966 TemplateParamLists.get(), 3967 TemplateParamLists.size(), 3968 /*never a friend*/ false, 3969 isExplicitSpecialization, 3970 Invalid)) { 3971 if (TemplateParams->size() > 0) { 3972 // There is no such thing as a variable template. 3973 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3974 << II 3975 << SourceRange(TemplateParams->getTemplateLoc(), 3976 TemplateParams->getRAngleLoc()); 3977 return 0; 3978 } else { 3979 // There is an extraneous 'template<>' for this variable. Complain 3980 // about it, but allow the declaration of the variable. 3981 Diag(TemplateParams->getTemplateLoc(), 3982 diag::err_template_variable_noparams) 3983 << II 3984 << SourceRange(TemplateParams->getTemplateLoc(), 3985 TemplateParams->getRAngleLoc()); 3986 } 3987 } 3988 3989 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 3990 D.getIdentifierLoc(), II, 3991 R, TInfo, SC, SCAsWritten); 3992 3993 // If this decl has an auto type in need of deduction, make a note of the 3994 // Decl so we can diagnose uses of it in its own initializer. 3995 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3996 R->getContainedAutoType()) 3997 ParsingInitForAutoVars.insert(NewVD); 3998 3999 if (D.isInvalidType() || Invalid) 4000 NewVD->setInvalidDecl(); 4001 4002 SetNestedNameSpecifier(NewVD, D); 4003 4004 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 4005 NewVD->setTemplateParameterListsInfo(Context, 4006 TemplateParamLists.size(), 4007 TemplateParamLists.release()); 4008 } 4009 4010 if (D.getDeclSpec().isConstexprSpecified()) 4011 NewVD->setConstexpr(true); 4012 } 4013 4014 // Set the lexical context. If the declarator has a C++ scope specifier, the 4015 // lexical context will be different from the semantic context. 4016 NewVD->setLexicalDeclContext(CurContext); 4017 4018 if (D.getDeclSpec().isThreadSpecified()) { 4019 if (NewVD->hasLocalStorage()) 4020 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4021 else if (!Context.getTargetInfo().isTLSSupported()) 4022 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4023 else 4024 NewVD->setThreadSpecified(true); 4025 } 4026 4027 if (D.getDeclSpec().isModulePrivateSpecified()) { 4028 if (isExplicitSpecialization) 4029 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4030 << 2 4031 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4032 else if (NewVD->hasLocalStorage()) 4033 Diag(NewVD->getLocation(), diag::err_module_private_local) 4034 << 0 << NewVD->getDeclName() 4035 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4036 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4037 else 4038 NewVD->setModulePrivate(); 4039 } 4040 4041 // Handle attributes prior to checking for duplicates in MergeVarDecl 4042 ProcessDeclAttributes(S, NewVD, D); 4043 4044 // In auto-retain/release, infer strong retension for variables of 4045 // retainable type. 4046 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4047 NewVD->setInvalidDecl(); 4048 4049 // Handle GNU asm-label extension (encoded as an attribute). 4050 if (Expr *E = (Expr*)D.getAsmLabel()) { 4051 // The parser guarantees this is a string. 4052 StringLiteral *SE = cast<StringLiteral>(E); 4053 StringRef Label = SE->getString(); 4054 if (S->getFnParent() != 0) { 4055 switch (SC) { 4056 case SC_None: 4057 case SC_Auto: 4058 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4059 break; 4060 case SC_Register: 4061 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4062 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4063 break; 4064 case SC_Static: 4065 case SC_Extern: 4066 case SC_PrivateExtern: 4067 case SC_OpenCLWorkGroupLocal: 4068 break; 4069 } 4070 } 4071 4072 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4073 Context, Label)); 4074 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 4075 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 4076 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier()); 4077 if (I != ExtnameUndeclaredIdentifiers.end()) { 4078 NewVD->addAttr(I->second); 4079 ExtnameUndeclaredIdentifiers.erase(I); 4080 } 4081 } 4082 4083 // Diagnose shadowed variables before filtering for scope. 4084 if (!D.getCXXScopeSpec().isSet()) 4085 CheckShadow(S, NewVD, Previous); 4086 4087 // Don't consider existing declarations that are in a different 4088 // scope and are out-of-semantic-context declarations (if the new 4089 // declaration has linkage). 4090 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4091 isExplicitSpecialization); 4092 4093 if (!getLangOpts().CPlusPlus) { 4094 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4095 } else { 4096 // Merge the decl with the existing one if appropriate. 4097 if (!Previous.empty()) { 4098 if (Previous.isSingleResult() && 4099 isa<FieldDecl>(Previous.getFoundDecl()) && 4100 D.getCXXScopeSpec().isSet()) { 4101 // The user tried to define a non-static data member 4102 // out-of-line (C++ [dcl.meaning]p1). 4103 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4104 << D.getCXXScopeSpec().getRange(); 4105 Previous.clear(); 4106 NewVD->setInvalidDecl(); 4107 } 4108 } else if (D.getCXXScopeSpec().isSet()) { 4109 // No previous declaration in the qualifying scope. 4110 Diag(D.getIdentifierLoc(), diag::err_no_member) 4111 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4112 << D.getCXXScopeSpec().getRange(); 4113 NewVD->setInvalidDecl(); 4114 } 4115 4116 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4117 4118 // This is an explicit specialization of a static data member. Check it. 4119 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4120 CheckMemberSpecialization(NewVD, Previous)) 4121 NewVD->setInvalidDecl(); 4122 } 4123 4124 // attributes declared post-definition are currently ignored 4125 // FIXME: This should be handled in attribute merging, not 4126 // here. 4127 if (Previous.isSingleResult()) { 4128 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4129 if (Def && (Def = Def->getDefinition()) && 4130 Def != NewVD && D.hasAttributes()) { 4131 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4132 Diag(Def->getLocation(), diag::note_previous_definition); 4133 } 4134 } 4135 4136 // If this is a locally-scoped extern C variable, update the map of 4137 // such variables. 4138 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4139 !NewVD->isInvalidDecl()) 4140 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4141 4142 // If there's a #pragma GCC visibility in scope, and this isn't a class 4143 // member, set the visibility of this variable. 4144 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4145 AddPushedVisibilityAttribute(NewVD); 4146 4147 MarkUnusedFileScopedDecl(NewVD); 4148 4149 return NewVD; 4150} 4151 4152/// \brief Diagnose variable or built-in function shadowing. Implements 4153/// -Wshadow. 4154/// 4155/// This method is called whenever a VarDecl is added to a "useful" 4156/// scope. 4157/// 4158/// \param S the scope in which the shadowing name is being declared 4159/// \param R the lookup of the name 4160/// 4161void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4162 // Return if warning is ignored. 4163 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4164 DiagnosticsEngine::Ignored) 4165 return; 4166 4167 // Don't diagnose declarations at file scope. 4168 if (D->hasGlobalStorage()) 4169 return; 4170 4171 DeclContext *NewDC = D->getDeclContext(); 4172 4173 // Only diagnose if we're shadowing an unambiguous field or variable. 4174 if (R.getResultKind() != LookupResult::Found) 4175 return; 4176 4177 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4178 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4179 return; 4180 4181 // Fields are not shadowed by variables in C++ static methods. 4182 if (isa<FieldDecl>(ShadowedDecl)) 4183 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4184 if (MD->isStatic()) 4185 return; 4186 4187 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4188 if (shadowedVar->isExternC()) { 4189 // For shadowing external vars, make sure that we point to the global 4190 // declaration, not a locally scoped extern declaration. 4191 for (VarDecl::redecl_iterator 4192 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4193 I != E; ++I) 4194 if (I->isFileVarDecl()) { 4195 ShadowedDecl = *I; 4196 break; 4197 } 4198 } 4199 4200 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4201 4202 // Only warn about certain kinds of shadowing for class members. 4203 if (NewDC && NewDC->isRecord()) { 4204 // In particular, don't warn about shadowing non-class members. 4205 if (!OldDC->isRecord()) 4206 return; 4207 4208 // TODO: should we warn about static data members shadowing 4209 // static data members from base classes? 4210 4211 // TODO: don't diagnose for inaccessible shadowed members. 4212 // This is hard to do perfectly because we might friend the 4213 // shadowing context, but that's just a false negative. 4214 } 4215 4216 // Determine what kind of declaration we're shadowing. 4217 unsigned Kind; 4218 if (isa<RecordDecl>(OldDC)) { 4219 if (isa<FieldDecl>(ShadowedDecl)) 4220 Kind = 3; // field 4221 else 4222 Kind = 2; // static data member 4223 } else if (OldDC->isFileContext()) 4224 Kind = 1; // global 4225 else 4226 Kind = 0; // local 4227 4228 DeclarationName Name = R.getLookupName(); 4229 4230 // Emit warning and note. 4231 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4232 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4233} 4234 4235/// \brief Check -Wshadow without the advantage of a previous lookup. 4236void Sema::CheckShadow(Scope *S, VarDecl *D) { 4237 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4238 DiagnosticsEngine::Ignored) 4239 return; 4240 4241 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4242 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4243 LookupName(R, S); 4244 CheckShadow(S, D, R); 4245} 4246 4247/// \brief Perform semantic checking on a newly-created variable 4248/// declaration. 4249/// 4250/// This routine performs all of the type-checking required for a 4251/// variable declaration once it has been built. It is used both to 4252/// check variables after they have been parsed and their declarators 4253/// have been translated into a declaration, and to check variables 4254/// that have been instantiated from a template. 4255/// 4256/// Sets NewVD->isInvalidDecl() if an error was encountered. 4257/// 4258/// Returns true if the variable declaration is a redeclaration. 4259bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4260 LookupResult &Previous) { 4261 // If the decl is already known invalid, don't check it. 4262 if (NewVD->isInvalidDecl()) 4263 return false; 4264 4265 QualType T = NewVD->getType(); 4266 4267 if (T->isObjCObjectType()) { 4268 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4269 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4270 T = Context.getObjCObjectPointerType(T); 4271 NewVD->setType(T); 4272 } 4273 4274 // Emit an error if an address space was applied to decl with local storage. 4275 // This includes arrays of objects with address space qualifiers, but not 4276 // automatic variables that point to other address spaces. 4277 // ISO/IEC TR 18037 S5.1.2 4278 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4279 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4280 NewVD->setInvalidDecl(); 4281 return false; 4282 } 4283 4284 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4285 && !NewVD->hasAttr<BlocksAttr>()) { 4286 if (getLangOpts().getGC() != LangOptions::NonGC) 4287 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4288 else 4289 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4290 } 4291 4292 bool isVM = T->isVariablyModifiedType(); 4293 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4294 NewVD->hasAttr<BlocksAttr>()) 4295 getCurFunction()->setHasBranchProtectedScope(); 4296 4297 if ((isVM && NewVD->hasLinkage()) || 4298 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4299 bool SizeIsNegative; 4300 llvm::APSInt Oversized; 4301 QualType FixedTy = 4302 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4303 Oversized); 4304 4305 if (FixedTy.isNull() && T->isVariableArrayType()) { 4306 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4307 // FIXME: This won't give the correct result for 4308 // int a[10][n]; 4309 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4310 4311 if (NewVD->isFileVarDecl()) 4312 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4313 << SizeRange; 4314 else if (NewVD->getStorageClass() == SC_Static) 4315 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4316 << SizeRange; 4317 else 4318 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4319 << SizeRange; 4320 NewVD->setInvalidDecl(); 4321 return false; 4322 } 4323 4324 if (FixedTy.isNull()) { 4325 if (NewVD->isFileVarDecl()) 4326 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4327 else 4328 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4329 NewVD->setInvalidDecl(); 4330 return false; 4331 } 4332 4333 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4334 NewVD->setType(FixedTy); 4335 } 4336 4337 if (Previous.empty() && NewVD->isExternC()) { 4338 // Since we did not find anything by this name and we're declaring 4339 // an extern "C" variable, look for a non-visible extern "C" 4340 // declaration with the same name. 4341 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4342 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4343 if (Pos != LocallyScopedExternalDecls.end()) 4344 Previous.addDecl(Pos->second); 4345 } 4346 4347 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4348 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4349 << T; 4350 NewVD->setInvalidDecl(); 4351 return false; 4352 } 4353 4354 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4355 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4356 NewVD->setInvalidDecl(); 4357 return false; 4358 } 4359 4360 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4361 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4362 NewVD->setInvalidDecl(); 4363 return false; 4364 } 4365 4366 if (NewVD->isConstexpr() && !T->isDependentType() && 4367 RequireLiteralType(NewVD->getLocation(), T, 4368 PDiag(diag::err_constexpr_var_non_literal))) { 4369 NewVD->setInvalidDecl(); 4370 return false; 4371 } 4372 4373 if (!Previous.empty()) { 4374 MergeVarDecl(NewVD, Previous); 4375 return true; 4376 } 4377 return false; 4378} 4379 4380/// \brief Data used with FindOverriddenMethod 4381struct FindOverriddenMethodData { 4382 Sema *S; 4383 CXXMethodDecl *Method; 4384}; 4385 4386/// \brief Member lookup function that determines whether a given C++ 4387/// method overrides a method in a base class, to be used with 4388/// CXXRecordDecl::lookupInBases(). 4389static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4390 CXXBasePath &Path, 4391 void *UserData) { 4392 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4393 4394 FindOverriddenMethodData *Data 4395 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4396 4397 DeclarationName Name = Data->Method->getDeclName(); 4398 4399 // FIXME: Do we care about other names here too? 4400 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4401 // We really want to find the base class destructor here. 4402 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4403 CanQualType CT = Data->S->Context.getCanonicalType(T); 4404 4405 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4406 } 4407 4408 for (Path.Decls = BaseRecord->lookup(Name); 4409 Path.Decls.first != Path.Decls.second; 4410 ++Path.Decls.first) { 4411 NamedDecl *D = *Path.Decls.first; 4412 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4413 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4414 return true; 4415 } 4416 } 4417 4418 return false; 4419} 4420 4421/// AddOverriddenMethods - See if a method overrides any in the base classes, 4422/// and if so, check that it's a valid override and remember it. 4423bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4424 // Look for virtual methods in base classes that this method might override. 4425 CXXBasePaths Paths; 4426 FindOverriddenMethodData Data; 4427 Data.Method = MD; 4428 Data.S = this; 4429 bool AddedAny = false; 4430 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4431 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4432 E = Paths.found_decls_end(); I != E; ++I) { 4433 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4434 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4435 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4436 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4437 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4438 AddedAny = true; 4439 } 4440 } 4441 } 4442 } 4443 4444 return AddedAny; 4445} 4446 4447namespace { 4448 // Struct for holding all of the extra arguments needed by 4449 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4450 struct ActOnFDArgs { 4451 Scope *S; 4452 Declarator &D; 4453 MultiTemplateParamsArg TemplateParamLists; 4454 bool AddToScope; 4455 }; 4456} 4457 4458namespace { 4459 4460// Callback to only accept typo corrections that have a non-zero edit distance. 4461// Also only accept corrections that have the same parent decl. 4462class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4463 public: 4464 DifferentNameValidatorCCC(CXXRecordDecl *Parent) 4465 : ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {} 4466 4467 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4468 if (candidate.getEditDistance() == 0) 4469 return false; 4470 4471 if (CXXMethodDecl *MD = candidate.getCorrectionDeclAs<CXXMethodDecl>()) { 4472 CXXRecordDecl *Parent = MD->getParent(); 4473 return Parent && Parent->getCanonicalDecl() == ExpectedParent; 4474 } 4475 4476 return !ExpectedParent; 4477 } 4478 4479 private: 4480 CXXRecordDecl *ExpectedParent; 4481}; 4482 4483} 4484 4485/// \brief Generate diagnostics for an invalid function redeclaration. 4486/// 4487/// This routine handles generating the diagnostic messages for an invalid 4488/// function redeclaration, including finding possible similar declarations 4489/// or performing typo correction if there are no previous declarations with 4490/// the same name. 4491/// 4492/// Returns a NamedDecl iff typo correction was performed and substituting in 4493/// the new declaration name does not cause new errors. 4494static NamedDecl* DiagnoseInvalidRedeclaration( 4495 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4496 ActOnFDArgs &ExtraArgs) { 4497 NamedDecl *Result = NULL; 4498 DeclarationName Name = NewFD->getDeclName(); 4499 DeclContext *NewDC = NewFD->getDeclContext(); 4500 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4501 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4502 llvm::SmallVector<unsigned, 1> MismatchedParams; 4503 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4504 TypoCorrection Correction; 4505 bool isFriendDecl = (SemaRef.getLangOpts().CPlusPlus && 4506 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4507 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4508 : diag::err_member_def_does_not_match; 4509 4510 NewFD->setInvalidDecl(); 4511 SemaRef.LookupQualifiedName(Prev, NewDC); 4512 assert(!Prev.isAmbiguous() && 4513 "Cannot have an ambiguity in previous-declaration lookup"); 4514 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 4515 DifferentNameValidatorCCC Validator(MD ? MD->getParent() : 0); 4516 if (!Prev.empty()) { 4517 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4518 Func != FuncEnd; ++Func) { 4519 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4520 if (FD && 4521 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4522 // Add 1 to the index so that 0 can mean the mismatch didn't 4523 // involve a parameter 4524 unsigned ParamNum = 4525 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4526 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4527 } 4528 } 4529 // If the qualified name lookup yielded nothing, try typo correction 4530 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4531 Prev.getLookupKind(), 0, 0, 4532 Validator, NewDC))) { 4533 // Trap errors. 4534 Sema::SFINAETrap Trap(SemaRef); 4535 4536 // Set up everything for the call to ActOnFunctionDeclarator 4537 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4538 ExtraArgs.D.getIdentifierLoc()); 4539 Previous.clear(); 4540 Previous.setLookupName(Correction.getCorrection()); 4541 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4542 CDeclEnd = Correction.end(); 4543 CDecl != CDeclEnd; ++CDecl) { 4544 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4545 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4546 MismatchedParams)) { 4547 Previous.addDecl(FD); 4548 } 4549 } 4550 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4551 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4552 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4553 // eliminate the need for the parameter pack ExtraArgs. 4554 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4555 NewFD->getDeclContext(), 4556 NewFD->getTypeSourceInfo(), 4557 Previous, 4558 ExtraArgs.TemplateParamLists, 4559 ExtraArgs.AddToScope); 4560 if (Trap.hasErrorOccurred()) { 4561 // Pretend the typo correction never occurred 4562 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4563 ExtraArgs.D.getIdentifierLoc()); 4564 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4565 Previous.clear(); 4566 Previous.setLookupName(Name); 4567 Result = NULL; 4568 } else { 4569 for (LookupResult::iterator Func = Previous.begin(), 4570 FuncEnd = Previous.end(); 4571 Func != FuncEnd; ++Func) { 4572 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4573 NearMatches.push_back(std::make_pair(FD, 0)); 4574 } 4575 } 4576 if (NearMatches.empty()) { 4577 // Ignore the correction if it didn't yield any close FunctionDecl matches 4578 Correction = TypoCorrection(); 4579 } else { 4580 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4581 : diag::err_member_def_does_not_match_suggest; 4582 } 4583 } 4584 4585 if (Correction) 4586 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4587 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOpts()) 4588 << FixItHint::CreateReplacement( 4589 NewFD->getLocation(), 4590 Correction.getAsString(SemaRef.getLangOpts())); 4591 else 4592 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4593 << Name << NewDC << NewFD->getLocation(); 4594 4595 bool NewFDisConst = false; 4596 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4597 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4598 4599 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4600 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4601 NearMatch != NearMatchEnd; ++NearMatch) { 4602 FunctionDecl *FD = NearMatch->first; 4603 bool FDisConst = false; 4604 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4605 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4606 4607 if (unsigned Idx = NearMatch->second) { 4608 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4609 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4610 diag::note_member_def_close_param_match) 4611 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4612 } else if (Correction) { 4613 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4614 << Correction.getQuoted(SemaRef.getLangOpts()); 4615 } else if (FDisConst != NewFDisConst) { 4616 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4617 << NewFDisConst << FD->getSourceRange().getEnd(); 4618 } else 4619 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4620 } 4621 return Result; 4622} 4623 4624static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4625 Declarator &D) { 4626 switch (D.getDeclSpec().getStorageClassSpec()) { 4627 default: llvm_unreachable("Unknown storage class!"); 4628 case DeclSpec::SCS_auto: 4629 case DeclSpec::SCS_register: 4630 case DeclSpec::SCS_mutable: 4631 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4632 diag::err_typecheck_sclass_func); 4633 D.setInvalidType(); 4634 break; 4635 case DeclSpec::SCS_unspecified: break; 4636 case DeclSpec::SCS_extern: return SC_Extern; 4637 case DeclSpec::SCS_static: { 4638 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4639 // C99 6.7.1p5: 4640 // The declaration of an identifier for a function that has 4641 // block scope shall have no explicit storage-class specifier 4642 // other than extern 4643 // See also (C++ [dcl.stc]p4). 4644 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4645 diag::err_static_block_func); 4646 break; 4647 } else 4648 return SC_Static; 4649 } 4650 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4651 } 4652 4653 // No explicit storage class has already been returned 4654 return SC_None; 4655} 4656 4657static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4658 DeclContext *DC, QualType &R, 4659 TypeSourceInfo *TInfo, 4660 FunctionDecl::StorageClass SC, 4661 bool &IsVirtualOkay) { 4662 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4663 DeclarationName Name = NameInfo.getName(); 4664 4665 FunctionDecl *NewFD = 0; 4666 bool isInline = D.getDeclSpec().isInlineSpecified(); 4667 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4668 FunctionDecl::StorageClass SCAsWritten 4669 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4670 4671 if (!SemaRef.getLangOpts().CPlusPlus) { 4672 // Determine whether the function was written with a 4673 // prototype. This true when: 4674 // - there is a prototype in the declarator, or 4675 // - the type R of the function is some kind of typedef or other reference 4676 // to a type name (which eventually refers to a function type). 4677 bool HasPrototype = 4678 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4679 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4680 4681 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4682 D.getLocStart(), NameInfo, R, 4683 TInfo, SC, SCAsWritten, isInline, 4684 HasPrototype); 4685 if (D.isInvalidType()) 4686 NewFD->setInvalidDecl(); 4687 4688 // Set the lexical context. 4689 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4690 4691 return NewFD; 4692 } 4693 4694 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4695 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4696 4697 // Check that the return type is not an abstract class type. 4698 // For record types, this is done by the AbstractClassUsageDiagnoser once 4699 // the class has been completely parsed. 4700 if (!DC->isRecord() && 4701 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4702 R->getAs<FunctionType>()->getResultType(), 4703 diag::err_abstract_type_in_decl, 4704 SemaRef.AbstractReturnType)) 4705 D.setInvalidType(); 4706 4707 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4708 // This is a C++ constructor declaration. 4709 assert(DC->isRecord() && 4710 "Constructors can only be declared in a member context"); 4711 4712 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4713 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4714 D.getLocStart(), NameInfo, 4715 R, TInfo, isExplicit, isInline, 4716 /*isImplicitlyDeclared=*/false, 4717 isConstexpr); 4718 4719 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4720 // This is a C++ destructor declaration. 4721 if (DC->isRecord()) { 4722 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4723 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4724 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4725 SemaRef.Context, Record, 4726 D.getLocStart(), 4727 NameInfo, R, TInfo, isInline, 4728 /*isImplicitlyDeclared=*/false); 4729 4730 // If the class is complete, then we now create the implicit exception 4731 // specification. If the class is incomplete or dependent, we can't do 4732 // it yet. 4733 if (SemaRef.getLangOpts().CPlusPlus0x && !Record->isDependentType() && 4734 Record->getDefinition() && !Record->isBeingDefined() && 4735 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4736 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4737 } 4738 4739 IsVirtualOkay = true; 4740 return NewDD; 4741 4742 } else { 4743 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4744 D.setInvalidType(); 4745 4746 // Create a FunctionDecl to satisfy the function definition parsing 4747 // code path. 4748 return FunctionDecl::Create(SemaRef.Context, DC, 4749 D.getLocStart(), 4750 D.getIdentifierLoc(), Name, R, TInfo, 4751 SC, SCAsWritten, isInline, 4752 /*hasPrototype=*/true, isConstexpr); 4753 } 4754 4755 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4756 if (!DC->isRecord()) { 4757 SemaRef.Diag(D.getIdentifierLoc(), 4758 diag::err_conv_function_not_member); 4759 return 0; 4760 } 4761 4762 SemaRef.CheckConversionDeclarator(D, R, SC); 4763 IsVirtualOkay = true; 4764 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4765 D.getLocStart(), NameInfo, 4766 R, TInfo, isInline, isExplicit, 4767 isConstexpr, SourceLocation()); 4768 4769 } else if (DC->isRecord()) { 4770 // If the name of the function is the same as the name of the record, 4771 // then this must be an invalid constructor that has a return type. 4772 // (The parser checks for a return type and makes the declarator a 4773 // constructor if it has no return type). 4774 if (Name.getAsIdentifierInfo() && 4775 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4776 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4777 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4778 << SourceRange(D.getIdentifierLoc()); 4779 return 0; 4780 } 4781 4782 bool isStatic = SC == SC_Static; 4783 4784 // [class.free]p1: 4785 // Any allocation function for a class T is a static member 4786 // (even if not explicitly declared static). 4787 if (Name.getCXXOverloadedOperator() == OO_New || 4788 Name.getCXXOverloadedOperator() == OO_Array_New) 4789 isStatic = true; 4790 4791 // [class.free]p6 Any deallocation function for a class X is a static member 4792 // (even if not explicitly declared static). 4793 if (Name.getCXXOverloadedOperator() == OO_Delete || 4794 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4795 isStatic = true; 4796 4797 IsVirtualOkay = !isStatic; 4798 4799 // This is a C++ method declaration. 4800 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4801 D.getLocStart(), NameInfo, R, 4802 TInfo, isStatic, SCAsWritten, isInline, 4803 isConstexpr, SourceLocation()); 4804 4805 } else { 4806 // Determine whether the function was written with a 4807 // prototype. This true when: 4808 // - we're in C++ (where every function has a prototype), 4809 return FunctionDecl::Create(SemaRef.Context, DC, 4810 D.getLocStart(), 4811 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4812 true/*HasPrototype*/, isConstexpr); 4813 } 4814} 4815 4816NamedDecl* 4817Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4818 TypeSourceInfo *TInfo, LookupResult &Previous, 4819 MultiTemplateParamsArg TemplateParamLists, 4820 bool &AddToScope) { 4821 QualType R = TInfo->getType(); 4822 4823 assert(R.getTypePtr()->isFunctionType()); 4824 4825 // TODO: consider using NameInfo for diagnostic. 4826 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4827 DeclarationName Name = NameInfo.getName(); 4828 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4829 4830 if (D.getDeclSpec().isThreadSpecified()) 4831 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4832 4833 // Do not allow returning a objc interface by-value. 4834 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4835 Diag(D.getIdentifierLoc(), 4836 diag::err_object_cannot_be_passed_returned_by_value) << 0 4837 << R->getAs<FunctionType>()->getResultType() 4838 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4839 4840 QualType T = R->getAs<FunctionType>()->getResultType(); 4841 T = Context.getObjCObjectPointerType(T); 4842 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4843 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4844 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4845 FPT->getNumArgs(), EPI); 4846 } 4847 else if (isa<FunctionNoProtoType>(R)) 4848 R = Context.getFunctionNoProtoType(T); 4849 } 4850 4851 bool isFriend = false; 4852 FunctionTemplateDecl *FunctionTemplate = 0; 4853 bool isExplicitSpecialization = false; 4854 bool isFunctionTemplateSpecialization = false; 4855 bool isDependentClassScopeExplicitSpecialization = false; 4856 bool isVirtualOkay = false; 4857 4858 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4859 isVirtualOkay); 4860 if (!NewFD) return 0; 4861 4862 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4863 NewFD->setTopLevelDeclInObjCContainer(); 4864 4865 if (getLangOpts().CPlusPlus) { 4866 bool isInline = D.getDeclSpec().isInlineSpecified(); 4867 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4868 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4869 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4870 isFriend = D.getDeclSpec().isFriendSpecified(); 4871 if (isFriend && !isInline && D.isFunctionDefinition()) { 4872 // C++ [class.friend]p5 4873 // A function can be defined in a friend declaration of a 4874 // class . . . . Such a function is implicitly inline. 4875 NewFD->setImplicitlyInline(); 4876 } 4877 4878 SetNestedNameSpecifier(NewFD, D); 4879 isExplicitSpecialization = false; 4880 isFunctionTemplateSpecialization = false; 4881 if (D.isInvalidType()) 4882 NewFD->setInvalidDecl(); 4883 4884 // Set the lexical context. If the declarator has a C++ 4885 // scope specifier, or is the object of a friend declaration, the 4886 // lexical context will be different from the semantic context. 4887 NewFD->setLexicalDeclContext(CurContext); 4888 4889 // Match up the template parameter lists with the scope specifier, then 4890 // determine whether we have a template or a template specialization. 4891 bool Invalid = false; 4892 if (TemplateParameterList *TemplateParams 4893 = MatchTemplateParametersToScopeSpecifier( 4894 D.getDeclSpec().getLocStart(), 4895 D.getIdentifierLoc(), 4896 D.getCXXScopeSpec(), 4897 TemplateParamLists.get(), 4898 TemplateParamLists.size(), 4899 isFriend, 4900 isExplicitSpecialization, 4901 Invalid)) { 4902 if (TemplateParams->size() > 0) { 4903 // This is a function template 4904 4905 // Check that we can declare a template here. 4906 if (CheckTemplateDeclScope(S, TemplateParams)) 4907 return 0; 4908 4909 // A destructor cannot be a template. 4910 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4911 Diag(NewFD->getLocation(), diag::err_destructor_template); 4912 return 0; 4913 } 4914 4915 // If we're adding a template to a dependent context, we may need to 4916 // rebuilding some of the types used within the template parameter list, 4917 // now that we know what the current instantiation is. 4918 if (DC->isDependentContext()) { 4919 ContextRAII SavedContext(*this, DC); 4920 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4921 Invalid = true; 4922 } 4923 4924 4925 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4926 NewFD->getLocation(), 4927 Name, TemplateParams, 4928 NewFD); 4929 FunctionTemplate->setLexicalDeclContext(CurContext); 4930 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4931 4932 // For source fidelity, store the other template param lists. 4933 if (TemplateParamLists.size() > 1) { 4934 NewFD->setTemplateParameterListsInfo(Context, 4935 TemplateParamLists.size() - 1, 4936 TemplateParamLists.release()); 4937 } 4938 } else { 4939 // This is a function template specialization. 4940 isFunctionTemplateSpecialization = true; 4941 // For source fidelity, store all the template param lists. 4942 NewFD->setTemplateParameterListsInfo(Context, 4943 TemplateParamLists.size(), 4944 TemplateParamLists.release()); 4945 4946 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4947 if (isFriend) { 4948 // We want to remove the "template<>", found here. 4949 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4950 4951 // If we remove the template<> and the name is not a 4952 // template-id, we're actually silently creating a problem: 4953 // the friend declaration will refer to an untemplated decl, 4954 // and clearly the user wants a template specialization. So 4955 // we need to insert '<>' after the name. 4956 SourceLocation InsertLoc; 4957 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4958 InsertLoc = D.getName().getSourceRange().getEnd(); 4959 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4960 } 4961 4962 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4963 << Name << RemoveRange 4964 << FixItHint::CreateRemoval(RemoveRange) 4965 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4966 } 4967 } 4968 } 4969 else { 4970 // All template param lists were matched against the scope specifier: 4971 // this is NOT (an explicit specialization of) a template. 4972 if (TemplateParamLists.size() > 0) 4973 // For source fidelity, store all the template param lists. 4974 NewFD->setTemplateParameterListsInfo(Context, 4975 TemplateParamLists.size(), 4976 TemplateParamLists.release()); 4977 } 4978 4979 if (Invalid) { 4980 NewFD->setInvalidDecl(); 4981 if (FunctionTemplate) 4982 FunctionTemplate->setInvalidDecl(); 4983 } 4984 4985 // If we see "T var();" at block scope, where T is a class type, it is 4986 // probably an attempt to initialize a variable, not a function declaration. 4987 // We don't catch this case earlier, since there is no ambiguity here. 4988 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 4989 CurContext->isFunctionOrMethod() && 4990 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 4991 D.getDeclSpec().getStorageClassSpecAsWritten() 4992 == DeclSpec::SCS_unspecified) { 4993 QualType T = R->getAs<FunctionType>()->getResultType(); 4994 DeclaratorChunk &C = D.getTypeObject(0); 4995 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 4996 !C.Fun.TrailingReturnType && 4997 C.Fun.getExceptionSpecType() == EST_None) { 4998 SourceRange ParenRange(C.Loc, C.EndLoc); 4999 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 5000 5001 // If the declaration looks like: 5002 // T var1, 5003 // f(); 5004 // and name lookup finds a function named 'f', then the ',' was 5005 // probably intended to be a ';'. 5006 if (!D.isFirstDeclarator() && D.getIdentifier()) { 5007 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 5008 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 5009 if (Comma.getFileID() != Name.getFileID() || 5010 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 5011 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 5012 LookupOrdinaryName); 5013 if (LookupName(Result, S)) 5014 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 5015 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 5016 } 5017 } 5018 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 5019 // Empty parens mean value-initialization, and no parens mean default 5020 // initialization. These are equivalent if the default constructor is 5021 // user-provided, or if zero-initialization is a no-op. 5022 if (RD && RD->hasDefinition() && 5023 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 5024 Diag(C.Loc, diag::note_empty_parens_default_ctor) 5025 << FixItHint::CreateRemoval(ParenRange); 5026 else if (const char *Init = getFixItZeroInitializerForType(T)) 5027 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5028 << FixItHint::CreateReplacement(ParenRange, Init); 5029 else if (LangOpts.CPlusPlus0x) 5030 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5031 << FixItHint::CreateReplacement(ParenRange, "{}"); 5032 } 5033 } 5034 5035 // C++ [dcl.fct.spec]p5: 5036 // The virtual specifier shall only be used in declarations of 5037 // nonstatic class member functions that appear within a 5038 // member-specification of a class declaration; see 10.3. 5039 // 5040 if (isVirtual && !NewFD->isInvalidDecl()) { 5041 if (!isVirtualOkay) { 5042 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5043 diag::err_virtual_non_function); 5044 } else if (!CurContext->isRecord()) { 5045 // 'virtual' was specified outside of the class. 5046 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5047 diag::err_virtual_out_of_class) 5048 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5049 } else if (NewFD->getDescribedFunctionTemplate()) { 5050 // C++ [temp.mem]p3: 5051 // A member function template shall not be virtual. 5052 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5053 diag::err_virtual_member_function_template) 5054 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5055 } else { 5056 // Okay: Add virtual to the method. 5057 NewFD->setVirtualAsWritten(true); 5058 } 5059 } 5060 5061 // C++ [dcl.fct.spec]p3: 5062 // The inline specifier shall not appear on a block scope function 5063 // declaration. 5064 if (isInline && !NewFD->isInvalidDecl()) { 5065 if (CurContext->isFunctionOrMethod()) { 5066 // 'inline' is not allowed on block scope function declaration. 5067 Diag(D.getDeclSpec().getInlineSpecLoc(), 5068 diag::err_inline_declaration_block_scope) << Name 5069 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5070 } 5071 } 5072 5073 // C++ [dcl.fct.spec]p6: 5074 // The explicit specifier shall be used only in the declaration of a 5075 // constructor or conversion function within its class definition; 5076 // see 12.3.1 and 12.3.2. 5077 if (isExplicit && !NewFD->isInvalidDecl()) { 5078 if (!CurContext->isRecord()) { 5079 // 'explicit' was specified outside of the class. 5080 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5081 diag::err_explicit_out_of_class) 5082 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5083 } else if (!isa<CXXConstructorDecl>(NewFD) && 5084 !isa<CXXConversionDecl>(NewFD)) { 5085 // 'explicit' was specified on a function that wasn't a constructor 5086 // or conversion function. 5087 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5088 diag::err_explicit_non_ctor_or_conv_function) 5089 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5090 } 5091 } 5092 5093 if (isConstexpr) { 5094 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5095 // are implicitly inline. 5096 NewFD->setImplicitlyInline(); 5097 5098 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5099 // be either constructors or to return a literal type. Therefore, 5100 // destructors cannot be declared constexpr. 5101 if (isa<CXXDestructorDecl>(NewFD)) 5102 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5103 } 5104 5105 // If __module_private__ was specified, mark the function accordingly. 5106 if (D.getDeclSpec().isModulePrivateSpecified()) { 5107 if (isFunctionTemplateSpecialization) { 5108 SourceLocation ModulePrivateLoc 5109 = D.getDeclSpec().getModulePrivateSpecLoc(); 5110 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5111 << 0 5112 << FixItHint::CreateRemoval(ModulePrivateLoc); 5113 } else { 5114 NewFD->setModulePrivate(); 5115 if (FunctionTemplate) 5116 FunctionTemplate->setModulePrivate(); 5117 } 5118 } 5119 5120 if (isFriend) { 5121 // For now, claim that the objects have no previous declaration. 5122 if (FunctionTemplate) { 5123 FunctionTemplate->setObjectOfFriendDecl(false); 5124 FunctionTemplate->setAccess(AS_public); 5125 } 5126 NewFD->setObjectOfFriendDecl(false); 5127 NewFD->setAccess(AS_public); 5128 } 5129 5130 // If a function is defined as defaulted or deleted, mark it as such now. 5131 switch (D.getFunctionDefinitionKind()) { 5132 case FDK_Declaration: 5133 case FDK_Definition: 5134 break; 5135 5136 case FDK_Defaulted: 5137 NewFD->setDefaulted(); 5138 break; 5139 5140 case FDK_Deleted: 5141 NewFD->setDeletedAsWritten(); 5142 break; 5143 } 5144 5145 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5146 D.isFunctionDefinition()) { 5147 // C++ [class.mfct]p2: 5148 // A member function may be defined (8.4) in its class definition, in 5149 // which case it is an inline member function (7.1.2) 5150 NewFD->setImplicitlyInline(); 5151 } 5152 5153 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5154 !CurContext->isRecord()) { 5155 // C++ [class.static]p1: 5156 // A data or function member of a class may be declared static 5157 // in a class definition, in which case it is a static member of 5158 // the class. 5159 5160 // Complain about the 'static' specifier if it's on an out-of-line 5161 // member function definition. 5162 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5163 diag::err_static_out_of_line) 5164 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5165 } 5166 } 5167 5168 // Filter out previous declarations that don't match the scope. 5169 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5170 isExplicitSpecialization || 5171 isFunctionTemplateSpecialization); 5172 5173 // Handle GNU asm-label extension (encoded as an attribute). 5174 if (Expr *E = (Expr*) D.getAsmLabel()) { 5175 // The parser guarantees this is a string. 5176 StringLiteral *SE = cast<StringLiteral>(E); 5177 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5178 SE->getString())); 5179 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 5180 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 5181 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); 5182 if (I != ExtnameUndeclaredIdentifiers.end()) { 5183 NewFD->addAttr(I->second); 5184 ExtnameUndeclaredIdentifiers.erase(I); 5185 } 5186 } 5187 5188 // Copy the parameter declarations from the declarator D to the function 5189 // declaration NewFD, if they are available. First scavenge them into Params. 5190 SmallVector<ParmVarDecl*, 16> Params; 5191 if (D.isFunctionDeclarator()) { 5192 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5193 5194 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5195 // function that takes no arguments, not a function that takes a 5196 // single void argument. 5197 // We let through "const void" here because Sema::GetTypeForDeclarator 5198 // already checks for that case. 5199 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5200 FTI.ArgInfo[0].Param && 5201 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5202 // Empty arg list, don't push any params. 5203 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5204 5205 // In C++, the empty parameter-type-list must be spelled "void"; a 5206 // typedef of void is not permitted. 5207 if (getLangOpts().CPlusPlus && 5208 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5209 bool IsTypeAlias = false; 5210 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5211 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5212 else if (const TemplateSpecializationType *TST = 5213 Param->getType()->getAs<TemplateSpecializationType>()) 5214 IsTypeAlias = TST->isTypeAlias(); 5215 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5216 << IsTypeAlias; 5217 } 5218 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5219 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5220 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5221 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5222 Param->setDeclContext(NewFD); 5223 Params.push_back(Param); 5224 5225 if (Param->isInvalidDecl()) 5226 NewFD->setInvalidDecl(); 5227 } 5228 } 5229 5230 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5231 // When we're declaring a function with a typedef, typeof, etc as in the 5232 // following example, we'll need to synthesize (unnamed) 5233 // parameters for use in the declaration. 5234 // 5235 // @code 5236 // typedef void fn(int); 5237 // fn f; 5238 // @endcode 5239 5240 // Synthesize a parameter for each argument type. 5241 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5242 AE = FT->arg_type_end(); AI != AE; ++AI) { 5243 ParmVarDecl *Param = 5244 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5245 Param->setScopeInfo(0, Params.size()); 5246 Params.push_back(Param); 5247 } 5248 } else { 5249 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5250 "Should not need args for typedef of non-prototype fn"); 5251 } 5252 5253 // Finally, we know we have the right number of parameters, install them. 5254 NewFD->setParams(Params); 5255 5256 // Find all anonymous symbols defined during the declaration of this function 5257 // and add to NewFD. This lets us track decls such 'enum Y' in: 5258 // 5259 // void f(enum Y {AA} x) {} 5260 // 5261 // which would otherwise incorrectly end up in the translation unit scope. 5262 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope); 5263 DeclsInPrototypeScope.clear(); 5264 5265 // Process the non-inheritable attributes on this declaration. 5266 ProcessDeclAttributes(S, NewFD, D, 5267 /*NonInheritable=*/true, /*Inheritable=*/false); 5268 5269 if (!getLangOpts().CPlusPlus) { 5270 // Perform semantic checking on the function declaration. 5271 bool isExplicitSpecialization=false; 5272 if (!NewFD->isInvalidDecl()) { 5273 if (NewFD->getResultType()->isVariablyModifiedType()) { 5274 // Functions returning a variably modified type violate C99 6.7.5.2p2 5275 // because all functions have linkage. 5276 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5277 NewFD->setInvalidDecl(); 5278 } else { 5279 if (NewFD->isMain()) 5280 CheckMain(NewFD, D.getDeclSpec()); 5281 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5282 isExplicitSpecialization)); 5283 } 5284 } 5285 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5286 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5287 "previous declaration set still overloaded"); 5288 } else { 5289 // If the declarator is a template-id, translate the parser's template 5290 // argument list into our AST format. 5291 bool HasExplicitTemplateArgs = false; 5292 TemplateArgumentListInfo TemplateArgs; 5293 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5294 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5295 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5296 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5297 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5298 TemplateId->getTemplateArgs(), 5299 TemplateId->NumArgs); 5300 translateTemplateArguments(TemplateArgsPtr, 5301 TemplateArgs); 5302 TemplateArgsPtr.release(); 5303 5304 HasExplicitTemplateArgs = true; 5305 5306 if (NewFD->isInvalidDecl()) { 5307 HasExplicitTemplateArgs = false; 5308 } else if (FunctionTemplate) { 5309 // Function template with explicit template arguments. 5310 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5311 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5312 5313 HasExplicitTemplateArgs = false; 5314 } else if (!isFunctionTemplateSpecialization && 5315 !D.getDeclSpec().isFriendSpecified()) { 5316 // We have encountered something that the user meant to be a 5317 // specialization (because it has explicitly-specified template 5318 // arguments) but that was not introduced with a "template<>" (or had 5319 // too few of them). 5320 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5321 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5322 << FixItHint::CreateInsertion( 5323 D.getDeclSpec().getLocStart(), 5324 "template<> "); 5325 isFunctionTemplateSpecialization = true; 5326 } else { 5327 // "friend void foo<>(int);" is an implicit specialization decl. 5328 isFunctionTemplateSpecialization = true; 5329 } 5330 } else if (isFriend && isFunctionTemplateSpecialization) { 5331 // This combination is only possible in a recovery case; the user 5332 // wrote something like: 5333 // template <> friend void foo(int); 5334 // which we're recovering from as if the user had written: 5335 // friend void foo<>(int); 5336 // Go ahead and fake up a template id. 5337 HasExplicitTemplateArgs = true; 5338 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5339 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5340 } 5341 5342 // If it's a friend (and only if it's a friend), it's possible 5343 // that either the specialized function type or the specialized 5344 // template is dependent, and therefore matching will fail. In 5345 // this case, don't check the specialization yet. 5346 bool InstantiationDependent = false; 5347 if (isFunctionTemplateSpecialization && isFriend && 5348 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5349 TemplateSpecializationType::anyDependentTemplateArguments( 5350 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5351 InstantiationDependent))) { 5352 assert(HasExplicitTemplateArgs && 5353 "friend function specialization without template args"); 5354 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5355 Previous)) 5356 NewFD->setInvalidDecl(); 5357 } else if (isFunctionTemplateSpecialization) { 5358 if (CurContext->isDependentContext() && CurContext->isRecord() 5359 && !isFriend) { 5360 isDependentClassScopeExplicitSpecialization = true; 5361 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ? 5362 diag::ext_function_specialization_in_class : 5363 diag::err_function_specialization_in_class) 5364 << NewFD->getDeclName(); 5365 } else if (CheckFunctionTemplateSpecialization(NewFD, 5366 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5367 Previous)) 5368 NewFD->setInvalidDecl(); 5369 5370 // C++ [dcl.stc]p1: 5371 // A storage-class-specifier shall not be specified in an explicit 5372 // specialization (14.7.3) 5373 if (SC != SC_None) { 5374 if (SC != NewFD->getStorageClass()) 5375 Diag(NewFD->getLocation(), 5376 diag::err_explicit_specialization_inconsistent_storage_class) 5377 << SC 5378 << FixItHint::CreateRemoval( 5379 D.getDeclSpec().getStorageClassSpecLoc()); 5380 5381 else 5382 Diag(NewFD->getLocation(), 5383 diag::ext_explicit_specialization_storage_class) 5384 << FixItHint::CreateRemoval( 5385 D.getDeclSpec().getStorageClassSpecLoc()); 5386 } 5387 5388 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5389 if (CheckMemberSpecialization(NewFD, Previous)) 5390 NewFD->setInvalidDecl(); 5391 } 5392 5393 // Perform semantic checking on the function declaration. 5394 if (!isDependentClassScopeExplicitSpecialization) { 5395 if (NewFD->isInvalidDecl()) { 5396 // If this is a class member, mark the class invalid immediately. 5397 // This avoids some consistency errors later. 5398 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5399 methodDecl->getParent()->setInvalidDecl(); 5400 } else { 5401 if (NewFD->isMain()) 5402 CheckMain(NewFD, D.getDeclSpec()); 5403 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5404 isExplicitSpecialization)); 5405 } 5406 } 5407 5408 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5409 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5410 "previous declaration set still overloaded"); 5411 5412 NamedDecl *PrincipalDecl = (FunctionTemplate 5413 ? cast<NamedDecl>(FunctionTemplate) 5414 : NewFD); 5415 5416 if (isFriend && D.isRedeclaration()) { 5417 AccessSpecifier Access = AS_public; 5418 if (!NewFD->isInvalidDecl()) 5419 Access = NewFD->getPreviousDecl()->getAccess(); 5420 5421 NewFD->setAccess(Access); 5422 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5423 5424 PrincipalDecl->setObjectOfFriendDecl(true); 5425 } 5426 5427 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5428 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5429 PrincipalDecl->setNonMemberOperator(); 5430 5431 // If we have a function template, check the template parameter 5432 // list. This will check and merge default template arguments. 5433 if (FunctionTemplate) { 5434 FunctionTemplateDecl *PrevTemplate = 5435 FunctionTemplate->getPreviousDecl(); 5436 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5437 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5438 D.getDeclSpec().isFriendSpecified() 5439 ? (D.isFunctionDefinition() 5440 ? TPC_FriendFunctionTemplateDefinition 5441 : TPC_FriendFunctionTemplate) 5442 : (D.getCXXScopeSpec().isSet() && 5443 DC && DC->isRecord() && 5444 DC->isDependentContext()) 5445 ? TPC_ClassTemplateMember 5446 : TPC_FunctionTemplate); 5447 } 5448 5449 if (NewFD->isInvalidDecl()) { 5450 // Ignore all the rest of this. 5451 } else if (!D.isRedeclaration()) { 5452 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5453 AddToScope }; 5454 // Fake up an access specifier if it's supposed to be a class member. 5455 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5456 NewFD->setAccess(AS_public); 5457 5458 // Qualified decls generally require a previous declaration. 5459 if (D.getCXXScopeSpec().isSet()) { 5460 // ...with the major exception of templated-scope or 5461 // dependent-scope friend declarations. 5462 5463 // TODO: we currently also suppress this check in dependent 5464 // contexts because (1) the parameter depth will be off when 5465 // matching friend templates and (2) we might actually be 5466 // selecting a friend based on a dependent factor. But there 5467 // are situations where these conditions don't apply and we 5468 // can actually do this check immediately. 5469 if (isFriend && 5470 (TemplateParamLists.size() || 5471 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5472 CurContext->isDependentContext())) { 5473 // ignore these 5474 } else { 5475 // The user tried to provide an out-of-line definition for a 5476 // function that is a member of a class or namespace, but there 5477 // was no such member function declared (C++ [class.mfct]p2, 5478 // C++ [namespace.memdef]p2). For example: 5479 // 5480 // class X { 5481 // void f() const; 5482 // }; 5483 // 5484 // void X::f() { } // ill-formed 5485 // 5486 // Complain about this problem, and attempt to suggest close 5487 // matches (e.g., those that differ only in cv-qualifiers and 5488 // whether the parameter types are references). 5489 5490 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5491 NewFD, 5492 ExtraArgs)) { 5493 AddToScope = ExtraArgs.AddToScope; 5494 return Result; 5495 } 5496 } 5497 5498 // Unqualified local friend declarations are required to resolve 5499 // to something. 5500 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5501 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5502 NewFD, 5503 ExtraArgs)) { 5504 AddToScope = ExtraArgs.AddToScope; 5505 return Result; 5506 } 5507 } 5508 5509 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5510 !isFriend && !isFunctionTemplateSpecialization && 5511 !isExplicitSpecialization) { 5512 // An out-of-line member function declaration must also be a 5513 // definition (C++ [dcl.meaning]p1). 5514 // Note that this is not the case for explicit specializations of 5515 // function templates or member functions of class templates, per 5516 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5517 // extension for compatibility with old SWIG code which likes to 5518 // generate them. 5519 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5520 << D.getCXXScopeSpec().getRange(); 5521 } 5522 } 5523 5524 5525 // Handle attributes. We need to have merged decls when handling attributes 5526 // (for example to check for conflicts, etc). 5527 // FIXME: This needs to happen before we merge declarations. Then, 5528 // let attribute merging cope with attribute conflicts. 5529 ProcessDeclAttributes(S, NewFD, D, 5530 /*NonInheritable=*/false, /*Inheritable=*/true); 5531 5532 // attributes declared post-definition are currently ignored 5533 // FIXME: This should happen during attribute merging 5534 if (D.isRedeclaration() && Previous.isSingleResult()) { 5535 const FunctionDecl *Def; 5536 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5537 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5538 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5539 Diag(Def->getLocation(), diag::note_previous_definition); 5540 } 5541 } 5542 5543 AddKnownFunctionAttributes(NewFD); 5544 5545 if (NewFD->hasAttr<OverloadableAttr>() && 5546 !NewFD->getType()->getAs<FunctionProtoType>()) { 5547 Diag(NewFD->getLocation(), 5548 diag::err_attribute_overloadable_no_prototype) 5549 << NewFD; 5550 5551 // Turn this into a variadic function with no parameters. 5552 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5553 FunctionProtoType::ExtProtoInfo EPI; 5554 EPI.Variadic = true; 5555 EPI.ExtInfo = FT->getExtInfo(); 5556 5557 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5558 NewFD->setType(R); 5559 } 5560 5561 // If there's a #pragma GCC visibility in scope, and this isn't a class 5562 // member, set the visibility of this function. 5563 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5564 AddPushedVisibilityAttribute(NewFD); 5565 5566 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5567 // marking the function. 5568 AddCFAuditedAttribute(NewFD); 5569 5570 // If this is a locally-scoped extern C function, update the 5571 // map of such names. 5572 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5573 && !NewFD->isInvalidDecl()) 5574 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5575 5576 // Set this FunctionDecl's range up to the right paren. 5577 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5578 5579 if (getLangOpts().CPlusPlus) { 5580 if (FunctionTemplate) { 5581 if (NewFD->isInvalidDecl()) 5582 FunctionTemplate->setInvalidDecl(); 5583 return FunctionTemplate; 5584 } 5585 } 5586 5587 MarkUnusedFileScopedDecl(NewFD); 5588 5589 if (getLangOpts().CUDA) 5590 if (IdentifierInfo *II = NewFD->getIdentifier()) 5591 if (!NewFD->isInvalidDecl() && 5592 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5593 if (II->isStr("cudaConfigureCall")) { 5594 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5595 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5596 5597 Context.setcudaConfigureCallDecl(NewFD); 5598 } 5599 } 5600 5601 // Here we have an function template explicit specialization at class scope. 5602 // The actually specialization will be postponed to template instatiation 5603 // time via the ClassScopeFunctionSpecializationDecl node. 5604 if (isDependentClassScopeExplicitSpecialization) { 5605 ClassScopeFunctionSpecializationDecl *NewSpec = 5606 ClassScopeFunctionSpecializationDecl::Create( 5607 Context, CurContext, SourceLocation(), 5608 cast<CXXMethodDecl>(NewFD)); 5609 CurContext->addDecl(NewSpec); 5610 AddToScope = false; 5611 } 5612 5613 return NewFD; 5614} 5615 5616/// \brief Perform semantic checking of a new function declaration. 5617/// 5618/// Performs semantic analysis of the new function declaration 5619/// NewFD. This routine performs all semantic checking that does not 5620/// require the actual declarator involved in the declaration, and is 5621/// used both for the declaration of functions as they are parsed 5622/// (called via ActOnDeclarator) and for the declaration of functions 5623/// that have been instantiated via C++ template instantiation (called 5624/// via InstantiateDecl). 5625/// 5626/// \param IsExplicitSpecialiation whether this new function declaration is 5627/// an explicit specialization of the previous declaration. 5628/// 5629/// This sets NewFD->isInvalidDecl() to true if there was an error. 5630/// 5631/// Returns true if the function declaration is a redeclaration. 5632bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5633 LookupResult &Previous, 5634 bool IsExplicitSpecialization) { 5635 assert(!NewFD->getResultType()->isVariablyModifiedType() 5636 && "Variably modified return types are not handled here"); 5637 5638 // Check for a previous declaration of this name. 5639 if (Previous.empty() && NewFD->isExternC()) { 5640 // Since we did not find anything by this name and we're declaring 5641 // an extern "C" function, look for a non-visible extern "C" 5642 // declaration with the same name. 5643 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5644 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5645 if (Pos != LocallyScopedExternalDecls.end()) 5646 Previous.addDecl(Pos->second); 5647 } 5648 5649 bool Redeclaration = false; 5650 5651 // Merge or overload the declaration with an existing declaration of 5652 // the same name, if appropriate. 5653 if (!Previous.empty()) { 5654 // Determine whether NewFD is an overload of PrevDecl or 5655 // a declaration that requires merging. If it's an overload, 5656 // there's no more work to do here; we'll just add the new 5657 // function to the scope. 5658 5659 NamedDecl *OldDecl = 0; 5660 if (!AllowOverloadingOfFunction(Previous, Context)) { 5661 Redeclaration = true; 5662 OldDecl = Previous.getFoundDecl(); 5663 } else { 5664 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5665 /*NewIsUsingDecl*/ false)) { 5666 case Ovl_Match: 5667 Redeclaration = true; 5668 break; 5669 5670 case Ovl_NonFunction: 5671 Redeclaration = true; 5672 break; 5673 5674 case Ovl_Overload: 5675 Redeclaration = false; 5676 break; 5677 } 5678 5679 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5680 // If a function name is overloadable in C, then every function 5681 // with that name must be marked "overloadable". 5682 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5683 << Redeclaration << NewFD; 5684 NamedDecl *OverloadedDecl = 0; 5685 if (Redeclaration) 5686 OverloadedDecl = OldDecl; 5687 else if (!Previous.empty()) 5688 OverloadedDecl = Previous.getRepresentativeDecl(); 5689 if (OverloadedDecl) 5690 Diag(OverloadedDecl->getLocation(), 5691 diag::note_attribute_overloadable_prev_overload); 5692 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5693 Context)); 5694 } 5695 } 5696 5697 if (Redeclaration) { 5698 // NewFD and OldDecl represent declarations that need to be 5699 // merged. 5700 if (MergeFunctionDecl(NewFD, OldDecl)) { 5701 NewFD->setInvalidDecl(); 5702 return Redeclaration; 5703 } 5704 5705 Previous.clear(); 5706 Previous.addDecl(OldDecl); 5707 5708 if (FunctionTemplateDecl *OldTemplateDecl 5709 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5710 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5711 FunctionTemplateDecl *NewTemplateDecl 5712 = NewFD->getDescribedFunctionTemplate(); 5713 assert(NewTemplateDecl && "Template/non-template mismatch"); 5714 if (CXXMethodDecl *Method 5715 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5716 Method->setAccess(OldTemplateDecl->getAccess()); 5717 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5718 } 5719 5720 // If this is an explicit specialization of a member that is a function 5721 // template, mark it as a member specialization. 5722 if (IsExplicitSpecialization && 5723 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5724 NewTemplateDecl->setMemberSpecialization(); 5725 assert(OldTemplateDecl->isMemberSpecialization()); 5726 } 5727 5728 } else { 5729 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5730 NewFD->setAccess(OldDecl->getAccess()); 5731 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5732 } 5733 } 5734 } 5735 5736 // Semantic checking for this function declaration (in isolation). 5737 if (getLangOpts().CPlusPlus) { 5738 // C++-specific checks. 5739 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5740 CheckConstructor(Constructor); 5741 } else if (CXXDestructorDecl *Destructor = 5742 dyn_cast<CXXDestructorDecl>(NewFD)) { 5743 CXXRecordDecl *Record = Destructor->getParent(); 5744 QualType ClassType = Context.getTypeDeclType(Record); 5745 5746 // FIXME: Shouldn't we be able to perform this check even when the class 5747 // type is dependent? Both gcc and edg can handle that. 5748 if (!ClassType->isDependentType()) { 5749 DeclarationName Name 5750 = Context.DeclarationNames.getCXXDestructorName( 5751 Context.getCanonicalType(ClassType)); 5752 if (NewFD->getDeclName() != Name) { 5753 Diag(NewFD->getLocation(), diag::err_destructor_name); 5754 NewFD->setInvalidDecl(); 5755 return Redeclaration; 5756 } 5757 } 5758 } else if (CXXConversionDecl *Conversion 5759 = dyn_cast<CXXConversionDecl>(NewFD)) { 5760 ActOnConversionDeclarator(Conversion); 5761 } 5762 5763 // Find any virtual functions that this function overrides. 5764 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5765 if (!Method->isFunctionTemplateSpecialization() && 5766 !Method->getDescribedFunctionTemplate()) { 5767 if (AddOverriddenMethods(Method->getParent(), Method)) { 5768 // If the function was marked as "static", we have a problem. 5769 if (NewFD->getStorageClass() == SC_Static) { 5770 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5771 << NewFD->getDeclName(); 5772 for (CXXMethodDecl::method_iterator 5773 Overridden = Method->begin_overridden_methods(), 5774 OverriddenEnd = Method->end_overridden_methods(); 5775 Overridden != OverriddenEnd; 5776 ++Overridden) { 5777 Diag((*Overridden)->getLocation(), 5778 diag::note_overridden_virtual_function); 5779 } 5780 } 5781 } 5782 } 5783 } 5784 5785 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5786 if (NewFD->isOverloadedOperator() && 5787 CheckOverloadedOperatorDeclaration(NewFD)) { 5788 NewFD->setInvalidDecl(); 5789 return Redeclaration; 5790 } 5791 5792 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5793 if (NewFD->getLiteralIdentifier() && 5794 CheckLiteralOperatorDeclaration(NewFD)) { 5795 NewFD->setInvalidDecl(); 5796 return Redeclaration; 5797 } 5798 5799 // In C++, check default arguments now that we have merged decls. Unless 5800 // the lexical context is the class, because in this case this is done 5801 // during delayed parsing anyway. 5802 if (!CurContext->isRecord()) 5803 CheckCXXDefaultArguments(NewFD); 5804 5805 // If this function declares a builtin function, check the type of this 5806 // declaration against the expected type for the builtin. 5807 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5808 ASTContext::GetBuiltinTypeError Error; 5809 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5810 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5811 // The type of this function differs from the type of the builtin, 5812 // so forget about the builtin entirely. 5813 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5814 } 5815 } 5816 5817 // If this function is declared as being extern "C", then check to see if 5818 // the function returns a UDT (class, struct, or union type) that is not C 5819 // compatible, and if it does, warn the user. 5820 if (NewFD->isExternC()) { 5821 QualType R = NewFD->getResultType(); 5822 if (!R.isPODType(Context) && 5823 !R->isVoidType()) 5824 Diag( NewFD->getLocation(), diag::warn_return_value_udt ) 5825 << NewFD << R; 5826 } 5827 } 5828 return Redeclaration; 5829} 5830 5831void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5832 // C++11 [basic.start.main]p3: A program that declares main to be inline, 5833 // static or constexpr is ill-formed. 5834 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5835 // shall not appear in a declaration of main. 5836 // static main is not an error under C99, but we should warn about it. 5837 if (FD->getStorageClass() == SC_Static) 5838 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus 5839 ? diag::err_static_main : diag::warn_static_main) 5840 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5841 if (FD->isInlineSpecified()) 5842 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5843 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5844 if (FD->isConstexpr()) { 5845 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 5846 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 5847 FD->setConstexpr(false); 5848 } 5849 5850 QualType T = FD->getType(); 5851 assert(T->isFunctionType() && "function decl is not of function type"); 5852 const FunctionType* FT = T->castAs<FunctionType>(); 5853 5854 // All the standards say that main() should should return 'int'. 5855 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5856 // In C and C++, main magically returns 0 if you fall off the end; 5857 // set the flag which tells us that. 5858 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5859 FD->setHasImplicitReturnZero(true); 5860 5861 // In C with GNU extensions we allow main() to have non-integer return 5862 // type, but we should warn about the extension, and we disable the 5863 // implicit-return-zero rule. 5864 } else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) { 5865 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); 5866 5867 // Otherwise, this is just a flat-out error. 5868 } else { 5869 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5870 FD->setInvalidDecl(true); 5871 } 5872 5873 // Treat protoless main() as nullary. 5874 if (isa<FunctionNoProtoType>(FT)) return; 5875 5876 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5877 unsigned nparams = FTP->getNumArgs(); 5878 assert(FD->getNumParams() == nparams); 5879 5880 bool HasExtraParameters = (nparams > 3); 5881 5882 // Darwin passes an undocumented fourth argument of type char**. If 5883 // other platforms start sprouting these, the logic below will start 5884 // getting shifty. 5885 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5886 HasExtraParameters = false; 5887 5888 if (HasExtraParameters) { 5889 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5890 FD->setInvalidDecl(true); 5891 nparams = 3; 5892 } 5893 5894 // FIXME: a lot of the following diagnostics would be improved 5895 // if we had some location information about types. 5896 5897 QualType CharPP = 5898 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5899 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5900 5901 for (unsigned i = 0; i < nparams; ++i) { 5902 QualType AT = FTP->getArgType(i); 5903 5904 bool mismatch = true; 5905 5906 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5907 mismatch = false; 5908 else if (Expected[i] == CharPP) { 5909 // As an extension, the following forms are okay: 5910 // char const ** 5911 // char const * const * 5912 // char * const * 5913 5914 QualifierCollector qs; 5915 const PointerType* PT; 5916 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5917 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5918 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5919 qs.removeConst(); 5920 mismatch = !qs.empty(); 5921 } 5922 } 5923 5924 if (mismatch) { 5925 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5926 // TODO: suggest replacing given type with expected type 5927 FD->setInvalidDecl(true); 5928 } 5929 } 5930 5931 if (nparams == 1 && !FD->isInvalidDecl()) { 5932 Diag(FD->getLocation(), diag::warn_main_one_arg); 5933 } 5934 5935 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5936 Diag(FD->getLocation(), diag::err_main_template_decl); 5937 FD->setInvalidDecl(); 5938 } 5939} 5940 5941bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5942 // FIXME: Need strict checking. In C89, we need to check for 5943 // any assignment, increment, decrement, function-calls, or 5944 // commas outside of a sizeof. In C99, it's the same list, 5945 // except that the aforementioned are allowed in unevaluated 5946 // expressions. Everything else falls under the 5947 // "may accept other forms of constant expressions" exception. 5948 // (We never end up here for C++, so the constant expression 5949 // rules there don't matter.) 5950 if (Init->isConstantInitializer(Context, false)) 5951 return false; 5952 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5953 << Init->getSourceRange(); 5954 return true; 5955} 5956 5957namespace { 5958 // Visits an initialization expression to see if OrigDecl is evaluated in 5959 // its own initialization and throws a warning if it does. 5960 class SelfReferenceChecker 5961 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5962 Sema &S; 5963 Decl *OrigDecl; 5964 bool isRecordType; 5965 bool isPODType; 5966 5967 public: 5968 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5969 5970 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5971 S(S), OrigDecl(OrigDecl) { 5972 isPODType = false; 5973 isRecordType = false; 5974 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5975 isPODType = VD->getType().isPODType(S.Context); 5976 isRecordType = VD->getType()->isRecordType(); 5977 } 5978 } 5979 5980 void VisitExpr(Expr *E) { 5981 if (isa<ObjCMessageExpr>(*E)) return; 5982 if (isRecordType) { 5983 Expr *expr = E; 5984 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5985 ValueDecl *VD = ME->getMemberDecl(); 5986 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5987 expr = ME->getBase(); 5988 } 5989 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5990 HandleDeclRefExpr(DRE); 5991 return; 5992 } 5993 } 5994 Inherited::VisitExpr(E); 5995 } 5996 5997 void VisitMemberExpr(MemberExpr *E) { 5998 if (E->getType()->canDecayToPointerType()) return; 5999 ValueDecl *VD = E->getMemberDecl(); 6000 if (isa<FieldDecl>(VD) || isa<CXXMethodDecl>(VD)) 6001 if (DeclRefExpr *DRE 6002 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 6003 HandleDeclRefExpr(DRE); 6004 return; 6005 } 6006 Inherited::VisitMemberExpr(E); 6007 } 6008 6009 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 6010 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 6011 (isRecordType && E->getCastKind() == CK_NoOp)) { 6012 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 6013 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 6014 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 6015 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 6016 HandleDeclRefExpr(DRE); 6017 return; 6018 } 6019 } 6020 Inherited::VisitImplicitCastExpr(E); 6021 } 6022 6023 void VisitUnaryOperator(UnaryOperator *E) { 6024 // For POD record types, addresses of its own members are well-defined. 6025 if (isRecordType && isPODType) return; 6026 Inherited::VisitUnaryOperator(E); 6027 } 6028 6029 void HandleDeclRefExpr(DeclRefExpr *DRE) { 6030 Decl* ReferenceDecl = DRE->getDecl(); 6031 if (OrigDecl != ReferenceDecl) return; 6032 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 6033 Sema::NotForRedeclaration); 6034 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 6035 S.PDiag(diag::warn_uninit_self_reference_in_init) 6036 << Result.getLookupName() 6037 << OrigDecl->getLocation() 6038 << DRE->getSourceRange()); 6039 } 6040 }; 6041} 6042 6043/// CheckSelfReference - Warns if OrigDecl is used in expression E. 6044void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 6045 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 6046} 6047 6048/// AddInitializerToDecl - Adds the initializer Init to the 6049/// declaration dcl. If DirectInit is true, this is C++ direct 6050/// initialization rather than copy initialization. 6051void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 6052 bool DirectInit, bool TypeMayContainAuto) { 6053 // If there is no declaration, there was an error parsing it. Just ignore 6054 // the initializer. 6055 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 6056 return; 6057 6058 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6059 // With declarators parsed the way they are, the parser cannot 6060 // distinguish between a normal initializer and a pure-specifier. 6061 // Thus this grotesque test. 6062 IntegerLiteral *IL; 6063 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6064 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6065 CheckPureMethod(Method, Init->getSourceRange()); 6066 else { 6067 Diag(Method->getLocation(), diag::err_member_function_initialization) 6068 << Method->getDeclName() << Init->getSourceRange(); 6069 Method->setInvalidDecl(); 6070 } 6071 return; 6072 } 6073 6074 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6075 if (!VDecl) { 6076 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6077 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6078 RealDecl->setInvalidDecl(); 6079 return; 6080 } 6081 6082 // Check for self-references within variable initializers. 6083 // Variables declared within a function/method body are handled 6084 // by a dataflow analysis. 6085 if (!VDecl->hasLocalStorage() && !VDecl->isStaticLocal()) 6086 CheckSelfReference(RealDecl, Init); 6087 6088 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); 6089 6090 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6091 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6092 Expr *DeduceInit = Init; 6093 // Initializer could be a C++ direct-initializer. Deduction only works if it 6094 // contains exactly one expression. 6095 if (CXXDirectInit) { 6096 if (CXXDirectInit->getNumExprs() == 0) { 6097 // It isn't possible to write this directly, but it is possible to 6098 // end up in this situation with "auto x(some_pack...);" 6099 Diag(CXXDirectInit->getLocStart(), 6100 diag::err_auto_var_init_no_expression) 6101 << VDecl->getDeclName() << VDecl->getType() 6102 << VDecl->getSourceRange(); 6103 RealDecl->setInvalidDecl(); 6104 return; 6105 } else if (CXXDirectInit->getNumExprs() > 1) { 6106 Diag(CXXDirectInit->getExpr(1)->getLocStart(), 6107 diag::err_auto_var_init_multiple_expressions) 6108 << VDecl->getDeclName() << VDecl->getType() 6109 << VDecl->getSourceRange(); 6110 RealDecl->setInvalidDecl(); 6111 return; 6112 } else { 6113 DeduceInit = CXXDirectInit->getExpr(0); 6114 } 6115 } 6116 TypeSourceInfo *DeducedType = 0; 6117 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) == 6118 DAR_Failed) 6119 DiagnoseAutoDeductionFailure(VDecl, DeduceInit); 6120 if (!DeducedType) { 6121 RealDecl->setInvalidDecl(); 6122 return; 6123 } 6124 VDecl->setTypeSourceInfo(DeducedType); 6125 VDecl->setType(DeducedType->getType()); 6126 VDecl->ClearLinkageCache(); 6127 6128 // In ARC, infer lifetime. 6129 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6130 VDecl->setInvalidDecl(); 6131 6132 // If this is a redeclaration, check that the type we just deduced matches 6133 // the previously declared type. 6134 if (VarDecl *Old = VDecl->getPreviousDecl()) 6135 MergeVarDeclTypes(VDecl, Old); 6136 } 6137 6138 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6139 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6140 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6141 VDecl->setInvalidDecl(); 6142 return; 6143 } 6144 6145 if (!VDecl->getType()->isDependentType()) { 6146 // A definition must end up with a complete type, which means it must be 6147 // complete with the restriction that an array type might be completed by 6148 // the initializer; note that later code assumes this restriction. 6149 QualType BaseDeclType = VDecl->getType(); 6150 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6151 BaseDeclType = Array->getElementType(); 6152 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6153 diag::err_typecheck_decl_incomplete_type)) { 6154 RealDecl->setInvalidDecl(); 6155 return; 6156 } 6157 6158 // The variable can not have an abstract class type. 6159 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6160 diag::err_abstract_type_in_decl, 6161 AbstractVariableType)) 6162 VDecl->setInvalidDecl(); 6163 } 6164 6165 const VarDecl *Def; 6166 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6167 Diag(VDecl->getLocation(), diag::err_redefinition) 6168 << VDecl->getDeclName(); 6169 Diag(Def->getLocation(), diag::note_previous_definition); 6170 VDecl->setInvalidDecl(); 6171 return; 6172 } 6173 6174 const VarDecl* PrevInit = 0; 6175 if (getLangOpts().CPlusPlus) { 6176 // C++ [class.static.data]p4 6177 // If a static data member is of const integral or const 6178 // enumeration type, its declaration in the class definition can 6179 // specify a constant-initializer which shall be an integral 6180 // constant expression (5.19). In that case, the member can appear 6181 // in integral constant expressions. The member shall still be 6182 // defined in a namespace scope if it is used in the program and the 6183 // namespace scope definition shall not contain an initializer. 6184 // 6185 // We already performed a redefinition check above, but for static 6186 // data members we also need to check whether there was an in-class 6187 // declaration with an initializer. 6188 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6189 Diag(VDecl->getLocation(), diag::err_redefinition) 6190 << VDecl->getDeclName(); 6191 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6192 return; 6193 } 6194 6195 if (VDecl->hasLocalStorage()) 6196 getCurFunction()->setHasBranchProtectedScope(); 6197 6198 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6199 VDecl->setInvalidDecl(); 6200 return; 6201 } 6202 } 6203 6204 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6205 // a kernel function cannot be initialized." 6206 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6207 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6208 VDecl->setInvalidDecl(); 6209 return; 6210 } 6211 6212 // Get the decls type and save a reference for later, since 6213 // CheckInitializerTypes may change it. 6214 QualType DclT = VDecl->getType(), SavT = DclT; 6215 6216 // Top-level message sends default to 'id' when we're in a debugger 6217 // and we are assigning it to a variable of 'id' type. 6218 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCIdType()) 6219 if (Init->getType() == Context.UnknownAnyTy && isa<ObjCMessageExpr>(Init)) { 6220 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); 6221 if (Result.isInvalid()) { 6222 VDecl->setInvalidDecl(); 6223 return; 6224 } 6225 Init = Result.take(); 6226 } 6227 6228 // Perform the initialization. 6229 if (!VDecl->isInvalidDecl()) { 6230 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6231 InitializationKind Kind 6232 = DirectInit ? 6233 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6234 Init->getLocStart(), 6235 Init->getLocEnd()) 6236 : InitializationKind::CreateDirectList( 6237 VDecl->getLocation()) 6238 : InitializationKind::CreateCopy(VDecl->getLocation(), 6239 Init->getLocStart()); 6240 6241 Expr **Args = &Init; 6242 unsigned NumArgs = 1; 6243 if (CXXDirectInit) { 6244 Args = CXXDirectInit->getExprs(); 6245 NumArgs = CXXDirectInit->getNumExprs(); 6246 } 6247 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs); 6248 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6249 MultiExprArg(*this, Args,NumArgs), 6250 &DclT); 6251 if (Result.isInvalid()) { 6252 VDecl->setInvalidDecl(); 6253 return; 6254 } 6255 6256 Init = Result.takeAs<Expr>(); 6257 } 6258 6259 // If the type changed, it means we had an incomplete type that was 6260 // completed by the initializer. For example: 6261 // int ary[] = { 1, 3, 5 }; 6262 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6263 if (!VDecl->isInvalidDecl() && (DclT != SavT)) 6264 VDecl->setType(DclT); 6265 6266 // Check any implicit conversions within the expression. 6267 CheckImplicitConversions(Init, VDecl->getLocation()); 6268 6269 if (!VDecl->isInvalidDecl()) 6270 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6271 6272 Init = MaybeCreateExprWithCleanups(Init); 6273 // Attach the initializer to the decl. 6274 VDecl->setInit(Init); 6275 6276 if (VDecl->isLocalVarDecl()) { 6277 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6278 // static storage duration shall be constant expressions or string literals. 6279 // C++ does not have this restriction. 6280 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() && 6281 VDecl->getStorageClass() == SC_Static) 6282 CheckForConstantInitializer(Init, DclT); 6283 } else if (VDecl->isStaticDataMember() && 6284 VDecl->getLexicalDeclContext()->isRecord()) { 6285 // This is an in-class initialization for a static data member, e.g., 6286 // 6287 // struct S { 6288 // static const int value = 17; 6289 // }; 6290 6291 // C++ [class.mem]p4: 6292 // A member-declarator can contain a constant-initializer only 6293 // if it declares a static member (9.4) of const integral or 6294 // const enumeration type, see 9.4.2. 6295 // 6296 // C++11 [class.static.data]p3: 6297 // If a non-volatile const static data member is of integral or 6298 // enumeration type, its declaration in the class definition can 6299 // specify a brace-or-equal-initializer in which every initalizer-clause 6300 // that is an assignment-expression is a constant expression. A static 6301 // data member of literal type can be declared in the class definition 6302 // with the constexpr specifier; if so, its declaration shall specify a 6303 // brace-or-equal-initializer in which every initializer-clause that is 6304 // an assignment-expression is a constant expression. 6305 6306 // Do nothing on dependent types. 6307 if (DclT->isDependentType()) { 6308 6309 // Allow any 'static constexpr' members, whether or not they are of literal 6310 // type. We separately check that every constexpr variable is of literal 6311 // type. 6312 } else if (VDecl->isConstexpr()) { 6313 6314 // Require constness. 6315 } else if (!DclT.isConstQualified()) { 6316 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6317 << Init->getSourceRange(); 6318 VDecl->setInvalidDecl(); 6319 6320 // We allow integer constant expressions in all cases. 6321 } else if (DclT->isIntegralOrEnumerationType()) { 6322 // Check whether the expression is a constant expression. 6323 SourceLocation Loc; 6324 if (getLangOpts().CPlusPlus0x && DclT.isVolatileQualified()) 6325 // In C++11, a non-constexpr const static data member with an 6326 // in-class initializer cannot be volatile. 6327 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6328 else if (Init->isValueDependent()) 6329 ; // Nothing to check. 6330 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6331 ; // Ok, it's an ICE! 6332 else if (Init->isEvaluatable(Context)) { 6333 // If we can constant fold the initializer through heroics, accept it, 6334 // but report this as a use of an extension for -pedantic. 6335 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6336 << Init->getSourceRange(); 6337 } else { 6338 // Otherwise, this is some crazy unknown case. Report the issue at the 6339 // location provided by the isIntegerConstantExpr failed check. 6340 Diag(Loc, diag::err_in_class_initializer_non_constant) 6341 << Init->getSourceRange(); 6342 VDecl->setInvalidDecl(); 6343 } 6344 6345 // We allow foldable floating-point constants as an extension. 6346 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6347 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6348 << DclT << Init->getSourceRange(); 6349 if (getLangOpts().CPlusPlus0x) 6350 Diag(VDecl->getLocation(), 6351 diag::note_in_class_initializer_float_type_constexpr) 6352 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6353 6354 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6355 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6356 << Init->getSourceRange(); 6357 VDecl->setInvalidDecl(); 6358 } 6359 6360 // Suggest adding 'constexpr' in C++11 for literal types. 6361 } else if (getLangOpts().CPlusPlus0x && DclT->isLiteralType()) { 6362 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6363 << DclT << Init->getSourceRange() 6364 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6365 VDecl->setConstexpr(true); 6366 6367 } else { 6368 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6369 << DclT << Init->getSourceRange(); 6370 VDecl->setInvalidDecl(); 6371 } 6372 } else if (VDecl->isFileVarDecl()) { 6373 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6374 (!getLangOpts().CPlusPlus || 6375 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6376 Diag(VDecl->getLocation(), diag::warn_extern_init); 6377 6378 // C99 6.7.8p4. All file scoped initializers need to be constant. 6379 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) 6380 CheckForConstantInitializer(Init, DclT); 6381 } 6382 6383 // We will represent direct-initialization similarly to copy-initialization: 6384 // int x(1); -as-> int x = 1; 6385 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6386 // 6387 // Clients that want to distinguish between the two forms, can check for 6388 // direct initializer using VarDecl::getInitStyle(). 6389 // A major benefit is that clients that don't particularly care about which 6390 // exactly form was it (like the CodeGen) can handle both cases without 6391 // special case code. 6392 6393 // C++ 8.5p11: 6394 // The form of initialization (using parentheses or '=') is generally 6395 // insignificant, but does matter when the entity being initialized has a 6396 // class type. 6397 if (CXXDirectInit) { 6398 assert(DirectInit && "Call-style initializer must be direct init."); 6399 VDecl->setInitStyle(VarDecl::CallInit); 6400 } else if (DirectInit) { 6401 // This must be list-initialization. No other way is direct-initialization. 6402 VDecl->setInitStyle(VarDecl::ListInit); 6403 } 6404 6405 CheckCompleteVariableDeclaration(VDecl); 6406} 6407 6408/// ActOnInitializerError - Given that there was an error parsing an 6409/// initializer for the given declaration, try to return to some form 6410/// of sanity. 6411void Sema::ActOnInitializerError(Decl *D) { 6412 // Our main concern here is re-establishing invariants like "a 6413 // variable's type is either dependent or complete". 6414 if (!D || D->isInvalidDecl()) return; 6415 6416 VarDecl *VD = dyn_cast<VarDecl>(D); 6417 if (!VD) return; 6418 6419 // Auto types are meaningless if we can't make sense of the initializer. 6420 if (ParsingInitForAutoVars.count(D)) { 6421 D->setInvalidDecl(); 6422 return; 6423 } 6424 6425 QualType Ty = VD->getType(); 6426 if (Ty->isDependentType()) return; 6427 6428 // Require a complete type. 6429 if (RequireCompleteType(VD->getLocation(), 6430 Context.getBaseElementType(Ty), 6431 diag::err_typecheck_decl_incomplete_type)) { 6432 VD->setInvalidDecl(); 6433 return; 6434 } 6435 6436 // Require an abstract type. 6437 if (RequireNonAbstractType(VD->getLocation(), Ty, 6438 diag::err_abstract_type_in_decl, 6439 AbstractVariableType)) { 6440 VD->setInvalidDecl(); 6441 return; 6442 } 6443 6444 // Don't bother complaining about constructors or destructors, 6445 // though. 6446} 6447 6448void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6449 bool TypeMayContainAuto) { 6450 // If there is no declaration, there was an error parsing it. Just ignore it. 6451 if (RealDecl == 0) 6452 return; 6453 6454 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6455 QualType Type = Var->getType(); 6456 6457 // C++11 [dcl.spec.auto]p3 6458 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6459 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6460 << Var->getDeclName() << Type; 6461 Var->setInvalidDecl(); 6462 return; 6463 } 6464 6465 // C++11 [class.static.data]p3: A static data member can be declared with 6466 // the constexpr specifier; if so, its declaration shall specify 6467 // a brace-or-equal-initializer. 6468 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6469 // the definition of a variable [...] or the declaration of a static data 6470 // member. 6471 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6472 if (Var->isStaticDataMember()) 6473 Diag(Var->getLocation(), 6474 diag::err_constexpr_static_mem_var_requires_init) 6475 << Var->getDeclName(); 6476 else 6477 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6478 Var->setInvalidDecl(); 6479 return; 6480 } 6481 6482 switch (Var->isThisDeclarationADefinition()) { 6483 case VarDecl::Definition: 6484 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6485 break; 6486 6487 // We have an out-of-line definition of a static data member 6488 // that has an in-class initializer, so we type-check this like 6489 // a declaration. 6490 // 6491 // Fall through 6492 6493 case VarDecl::DeclarationOnly: 6494 // It's only a declaration. 6495 6496 // Block scope. C99 6.7p7: If an identifier for an object is 6497 // declared with no linkage (C99 6.2.2p6), the type for the 6498 // object shall be complete. 6499 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6500 !Var->getLinkage() && !Var->isInvalidDecl() && 6501 RequireCompleteType(Var->getLocation(), Type, 6502 diag::err_typecheck_decl_incomplete_type)) 6503 Var->setInvalidDecl(); 6504 6505 // Make sure that the type is not abstract. 6506 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6507 RequireNonAbstractType(Var->getLocation(), Type, 6508 diag::err_abstract_type_in_decl, 6509 AbstractVariableType)) 6510 Var->setInvalidDecl(); 6511 return; 6512 6513 case VarDecl::TentativeDefinition: 6514 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6515 // object that has file scope without an initializer, and without a 6516 // storage-class specifier or with the storage-class specifier "static", 6517 // constitutes a tentative definition. Note: A tentative definition with 6518 // external linkage is valid (C99 6.2.2p5). 6519 if (!Var->isInvalidDecl()) { 6520 if (const IncompleteArrayType *ArrayT 6521 = Context.getAsIncompleteArrayType(Type)) { 6522 if (RequireCompleteType(Var->getLocation(), 6523 ArrayT->getElementType(), 6524 diag::err_illegal_decl_array_incomplete_type)) 6525 Var->setInvalidDecl(); 6526 } else if (Var->getStorageClass() == SC_Static) { 6527 // C99 6.9.2p3: If the declaration of an identifier for an object is 6528 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6529 // declared type shall not be an incomplete type. 6530 // NOTE: code such as the following 6531 // static struct s; 6532 // struct s { int a; }; 6533 // is accepted by gcc. Hence here we issue a warning instead of 6534 // an error and we do not invalidate the static declaration. 6535 // NOTE: to avoid multiple warnings, only check the first declaration. 6536 if (Var->getPreviousDecl() == 0) 6537 RequireCompleteType(Var->getLocation(), Type, 6538 diag::ext_typecheck_decl_incomplete_type); 6539 } 6540 } 6541 6542 // Record the tentative definition; we're done. 6543 if (!Var->isInvalidDecl()) 6544 TentativeDefinitions.push_back(Var); 6545 return; 6546 } 6547 6548 // Provide a specific diagnostic for uninitialized variable 6549 // definitions with incomplete array type. 6550 if (Type->isIncompleteArrayType()) { 6551 Diag(Var->getLocation(), 6552 diag::err_typecheck_incomplete_array_needs_initializer); 6553 Var->setInvalidDecl(); 6554 return; 6555 } 6556 6557 // Provide a specific diagnostic for uninitialized variable 6558 // definitions with reference type. 6559 if (Type->isReferenceType()) { 6560 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6561 << Var->getDeclName() 6562 << SourceRange(Var->getLocation(), Var->getLocation()); 6563 Var->setInvalidDecl(); 6564 return; 6565 } 6566 6567 // Do not attempt to type-check the default initializer for a 6568 // variable with dependent type. 6569 if (Type->isDependentType()) 6570 return; 6571 6572 if (Var->isInvalidDecl()) 6573 return; 6574 6575 if (RequireCompleteType(Var->getLocation(), 6576 Context.getBaseElementType(Type), 6577 diag::err_typecheck_decl_incomplete_type)) { 6578 Var->setInvalidDecl(); 6579 return; 6580 } 6581 6582 // The variable can not have an abstract class type. 6583 if (RequireNonAbstractType(Var->getLocation(), Type, 6584 diag::err_abstract_type_in_decl, 6585 AbstractVariableType)) { 6586 Var->setInvalidDecl(); 6587 return; 6588 } 6589 6590 // Check for jumps past the implicit initializer. C++0x 6591 // clarifies that this applies to a "variable with automatic 6592 // storage duration", not a "local variable". 6593 // C++11 [stmt.dcl]p3 6594 // A program that jumps from a point where a variable with automatic 6595 // storage duration is not in scope to a point where it is in scope is 6596 // ill-formed unless the variable has scalar type, class type with a 6597 // trivial default constructor and a trivial destructor, a cv-qualified 6598 // version of one of these types, or an array of one of the preceding 6599 // types and is declared without an initializer. 6600 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) { 6601 if (const RecordType *Record 6602 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6603 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6604 // Mark the function for further checking even if the looser rules of 6605 // C++11 do not require such checks, so that we can diagnose 6606 // incompatibilities with C++98. 6607 if (!CXXRecord->isPOD()) 6608 getCurFunction()->setHasBranchProtectedScope(); 6609 } 6610 } 6611 6612 // C++03 [dcl.init]p9: 6613 // If no initializer is specified for an object, and the 6614 // object is of (possibly cv-qualified) non-POD class type (or 6615 // array thereof), the object shall be default-initialized; if 6616 // the object is of const-qualified type, the underlying class 6617 // type shall have a user-declared default 6618 // constructor. Otherwise, if no initializer is specified for 6619 // a non- static object, the object and its subobjects, if 6620 // any, have an indeterminate initial value); if the object 6621 // or any of its subobjects are of const-qualified type, the 6622 // program is ill-formed. 6623 // C++0x [dcl.init]p11: 6624 // If no initializer is specified for an object, the object is 6625 // default-initialized; [...]. 6626 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6627 InitializationKind Kind 6628 = InitializationKind::CreateDefault(Var->getLocation()); 6629 6630 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6631 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6632 MultiExprArg(*this, 0, 0)); 6633 if (Init.isInvalid()) 6634 Var->setInvalidDecl(); 6635 else if (Init.get()) { 6636 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6637 // This is important for template substitution. 6638 Var->setInitStyle(VarDecl::CallInit); 6639 } 6640 6641 CheckCompleteVariableDeclaration(Var); 6642 } 6643} 6644 6645void Sema::ActOnCXXForRangeDecl(Decl *D) { 6646 VarDecl *VD = dyn_cast<VarDecl>(D); 6647 if (!VD) { 6648 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6649 D->setInvalidDecl(); 6650 return; 6651 } 6652 6653 VD->setCXXForRangeDecl(true); 6654 6655 // for-range-declaration cannot be given a storage class specifier. 6656 int Error = -1; 6657 switch (VD->getStorageClassAsWritten()) { 6658 case SC_None: 6659 break; 6660 case SC_Extern: 6661 Error = 0; 6662 break; 6663 case SC_Static: 6664 Error = 1; 6665 break; 6666 case SC_PrivateExtern: 6667 Error = 2; 6668 break; 6669 case SC_Auto: 6670 Error = 3; 6671 break; 6672 case SC_Register: 6673 Error = 4; 6674 break; 6675 case SC_OpenCLWorkGroupLocal: 6676 llvm_unreachable("Unexpected storage class"); 6677 } 6678 if (VD->isConstexpr()) 6679 Error = 5; 6680 if (Error != -1) { 6681 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6682 << VD->getDeclName() << Error; 6683 D->setInvalidDecl(); 6684 } 6685} 6686 6687void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6688 if (var->isInvalidDecl()) return; 6689 6690 // In ARC, don't allow jumps past the implicit initialization of a 6691 // local retaining variable. 6692 if (getLangOpts().ObjCAutoRefCount && 6693 var->hasLocalStorage()) { 6694 switch (var->getType().getObjCLifetime()) { 6695 case Qualifiers::OCL_None: 6696 case Qualifiers::OCL_ExplicitNone: 6697 case Qualifiers::OCL_Autoreleasing: 6698 break; 6699 6700 case Qualifiers::OCL_Weak: 6701 case Qualifiers::OCL_Strong: 6702 getCurFunction()->setHasBranchProtectedScope(); 6703 break; 6704 } 6705 } 6706 6707 // All the following checks are C++ only. 6708 if (!getLangOpts().CPlusPlus) return; 6709 6710 QualType baseType = Context.getBaseElementType(var->getType()); 6711 if (baseType->isDependentType()) return; 6712 6713 // __block variables might require us to capture a copy-initializer. 6714 if (var->hasAttr<BlocksAttr>()) { 6715 // It's currently invalid to ever have a __block variable with an 6716 // array type; should we diagnose that here? 6717 6718 // Regardless, we don't want to ignore array nesting when 6719 // constructing this copy. 6720 QualType type = var->getType(); 6721 6722 if (type->isStructureOrClassType()) { 6723 SourceLocation poi = var->getLocation(); 6724 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi); 6725 ExprResult result = 6726 PerformCopyInitialization( 6727 InitializedEntity::InitializeBlock(poi, type, false), 6728 poi, Owned(varRef)); 6729 if (!result.isInvalid()) { 6730 result = MaybeCreateExprWithCleanups(result); 6731 Expr *init = result.takeAs<Expr>(); 6732 Context.setBlockVarCopyInits(var, init); 6733 } 6734 } 6735 } 6736 6737 Expr *Init = var->getInit(); 6738 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6739 6740 if (!var->getDeclContext()->isDependentContext() && Init) { 6741 if (IsGlobal && !var->isConstexpr() && 6742 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6743 var->getLocation()) 6744 != DiagnosticsEngine::Ignored && 6745 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6746 Diag(var->getLocation(), diag::warn_global_constructor) 6747 << Init->getSourceRange(); 6748 6749 if (var->isConstexpr()) { 6750 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6751 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6752 SourceLocation DiagLoc = var->getLocation(); 6753 // If the note doesn't add any useful information other than a source 6754 // location, fold it into the primary diagnostic. 6755 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6756 diag::note_invalid_subexpr_in_const_expr) { 6757 DiagLoc = Notes[0].first; 6758 Notes.clear(); 6759 } 6760 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6761 << var << Init->getSourceRange(); 6762 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6763 Diag(Notes[I].first, Notes[I].second); 6764 } 6765 } else if (var->isUsableInConstantExpressions(Context)) { 6766 // Check whether the initializer of a const variable of integral or 6767 // enumeration type is an ICE now, since we can't tell whether it was 6768 // initialized by a constant expression if we check later. 6769 var->checkInitIsICE(); 6770 } 6771 } 6772 6773 // Require the destructor. 6774 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6775 FinalizeVarWithDestructor(var, recordType); 6776} 6777 6778/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6779/// any semantic actions necessary after any initializer has been attached. 6780void 6781Sema::FinalizeDeclaration(Decl *ThisDecl) { 6782 // Note that we are no longer parsing the initializer for this declaration. 6783 ParsingInitForAutoVars.erase(ThisDecl); 6784} 6785 6786Sema::DeclGroupPtrTy 6787Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6788 Decl **Group, unsigned NumDecls) { 6789 SmallVector<Decl*, 8> Decls; 6790 6791 if (DS.isTypeSpecOwned()) 6792 Decls.push_back(DS.getRepAsDecl()); 6793 6794 for (unsigned i = 0; i != NumDecls; ++i) 6795 if (Decl *D = Group[i]) 6796 Decls.push_back(D); 6797 6798 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6799 DS.getTypeSpecType() == DeclSpec::TST_auto); 6800} 6801 6802/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6803/// group, performing any necessary semantic checking. 6804Sema::DeclGroupPtrTy 6805Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6806 bool TypeMayContainAuto) { 6807 // C++0x [dcl.spec.auto]p7: 6808 // If the type deduced for the template parameter U is not the same in each 6809 // deduction, the program is ill-formed. 6810 // FIXME: When initializer-list support is added, a distinction is needed 6811 // between the deduced type U and the deduced type which 'auto' stands for. 6812 // auto a = 0, b = { 1, 2, 3 }; 6813 // is legal because the deduced type U is 'int' in both cases. 6814 if (TypeMayContainAuto && NumDecls > 1) { 6815 QualType Deduced; 6816 CanQualType DeducedCanon; 6817 VarDecl *DeducedDecl = 0; 6818 for (unsigned i = 0; i != NumDecls; ++i) { 6819 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6820 AutoType *AT = D->getType()->getContainedAutoType(); 6821 // Don't reissue diagnostics when instantiating a template. 6822 if (AT && D->isInvalidDecl()) 6823 break; 6824 if (AT && AT->isDeduced()) { 6825 QualType U = AT->getDeducedType(); 6826 CanQualType UCanon = Context.getCanonicalType(U); 6827 if (Deduced.isNull()) { 6828 Deduced = U; 6829 DeducedCanon = UCanon; 6830 DeducedDecl = D; 6831 } else if (DeducedCanon != UCanon) { 6832 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6833 diag::err_auto_different_deductions) 6834 << Deduced << DeducedDecl->getDeclName() 6835 << U << D->getDeclName() 6836 << DeducedDecl->getInit()->getSourceRange() 6837 << D->getInit()->getSourceRange(); 6838 D->setInvalidDecl(); 6839 break; 6840 } 6841 } 6842 } 6843 } 6844 } 6845 6846 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6847} 6848 6849 6850/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6851/// to introduce parameters into function prototype scope. 6852Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6853 const DeclSpec &DS = D.getDeclSpec(); 6854 6855 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6856 // C++03 [dcl.stc]p2 also permits 'auto'. 6857 VarDecl::StorageClass StorageClass = SC_None; 6858 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6859 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6860 StorageClass = SC_Register; 6861 StorageClassAsWritten = SC_Register; 6862 } else if (getLangOpts().CPlusPlus && 6863 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6864 StorageClass = SC_Auto; 6865 StorageClassAsWritten = SC_Auto; 6866 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6867 Diag(DS.getStorageClassSpecLoc(), 6868 diag::err_invalid_storage_class_in_func_decl); 6869 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6870 } 6871 6872 if (D.getDeclSpec().isThreadSpecified()) 6873 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6874 if (D.getDeclSpec().isConstexprSpecified()) 6875 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6876 << 0; 6877 6878 DiagnoseFunctionSpecifiers(D); 6879 6880 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6881 QualType parmDeclType = TInfo->getType(); 6882 6883 if (getLangOpts().CPlusPlus) { 6884 // Check that there are no default arguments inside the type of this 6885 // parameter. 6886 CheckExtraCXXDefaultArguments(D); 6887 6888 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6889 if (D.getCXXScopeSpec().isSet()) { 6890 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6891 << D.getCXXScopeSpec().getRange(); 6892 D.getCXXScopeSpec().clear(); 6893 } 6894 } 6895 6896 // Ensure we have a valid name 6897 IdentifierInfo *II = 0; 6898 if (D.hasName()) { 6899 II = D.getIdentifier(); 6900 if (!II) { 6901 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6902 << GetNameForDeclarator(D).getName().getAsString(); 6903 D.setInvalidType(true); 6904 } 6905 } 6906 6907 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6908 if (II) { 6909 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6910 ForRedeclaration); 6911 LookupName(R, S); 6912 if (R.isSingleResult()) { 6913 NamedDecl *PrevDecl = R.getFoundDecl(); 6914 if (PrevDecl->isTemplateParameter()) { 6915 // Maybe we will complain about the shadowed template parameter. 6916 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6917 // Just pretend that we didn't see the previous declaration. 6918 PrevDecl = 0; 6919 } else if (S->isDeclScope(PrevDecl)) { 6920 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6921 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6922 6923 // Recover by removing the name 6924 II = 0; 6925 D.SetIdentifier(0, D.getIdentifierLoc()); 6926 D.setInvalidType(true); 6927 } 6928 } 6929 } 6930 6931 // Temporarily put parameter variables in the translation unit, not 6932 // the enclosing context. This prevents them from accidentally 6933 // looking like class members in C++. 6934 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6935 D.getLocStart(), 6936 D.getIdentifierLoc(), II, 6937 parmDeclType, TInfo, 6938 StorageClass, StorageClassAsWritten); 6939 6940 if (D.isInvalidType()) 6941 New->setInvalidDecl(); 6942 6943 assert(S->isFunctionPrototypeScope()); 6944 assert(S->getFunctionPrototypeDepth() >= 1); 6945 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6946 S->getNextFunctionPrototypeIndex()); 6947 6948 // Add the parameter declaration into this scope. 6949 S->AddDecl(New); 6950 if (II) 6951 IdResolver.AddDecl(New); 6952 6953 ProcessDeclAttributes(S, New, D); 6954 6955 if (D.getDeclSpec().isModulePrivateSpecified()) 6956 Diag(New->getLocation(), diag::err_module_private_local) 6957 << 1 << New->getDeclName() 6958 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6959 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6960 6961 if (New->hasAttr<BlocksAttr>()) { 6962 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6963 } 6964 return New; 6965} 6966 6967/// \brief Synthesizes a variable for a parameter arising from a 6968/// typedef. 6969ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6970 SourceLocation Loc, 6971 QualType T) { 6972 /* FIXME: setting StartLoc == Loc. 6973 Would it be worth to modify callers so as to provide proper source 6974 location for the unnamed parameters, embedding the parameter's type? */ 6975 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6976 T, Context.getTrivialTypeSourceInfo(T, Loc), 6977 SC_None, SC_None, 0); 6978 Param->setImplicit(); 6979 return Param; 6980} 6981 6982void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6983 ParmVarDecl * const *ParamEnd) { 6984 // Don't diagnose unused-parameter errors in template instantiations; we 6985 // will already have done so in the template itself. 6986 if (!ActiveTemplateInstantiations.empty()) 6987 return; 6988 6989 for (; Param != ParamEnd; ++Param) { 6990 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 6991 !(*Param)->hasAttr<UnusedAttr>()) { 6992 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6993 << (*Param)->getDeclName(); 6994 } 6995 } 6996} 6997 6998void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6999 ParmVarDecl * const *ParamEnd, 7000 QualType ReturnTy, 7001 NamedDecl *D) { 7002 if (LangOpts.NumLargeByValueCopy == 0) // No check. 7003 return; 7004 7005 // Warn if the return value is pass-by-value and larger than the specified 7006 // threshold. 7007 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 7008 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 7009 if (Size > LangOpts.NumLargeByValueCopy) 7010 Diag(D->getLocation(), diag::warn_return_value_size) 7011 << D->getDeclName() << Size; 7012 } 7013 7014 // Warn if any parameter is pass-by-value and larger than the specified 7015 // threshold. 7016 for (; Param != ParamEnd; ++Param) { 7017 QualType T = (*Param)->getType(); 7018 if (T->isDependentType() || !T.isPODType(Context)) 7019 continue; 7020 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 7021 if (Size > LangOpts.NumLargeByValueCopy) 7022 Diag((*Param)->getLocation(), diag::warn_parameter_size) 7023 << (*Param)->getDeclName() << Size; 7024 } 7025} 7026 7027ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 7028 SourceLocation NameLoc, IdentifierInfo *Name, 7029 QualType T, TypeSourceInfo *TSInfo, 7030 VarDecl::StorageClass StorageClass, 7031 VarDecl::StorageClass StorageClassAsWritten) { 7032 // In ARC, infer a lifetime qualifier for appropriate parameter types. 7033 if (getLangOpts().ObjCAutoRefCount && 7034 T.getObjCLifetime() == Qualifiers::OCL_None && 7035 T->isObjCLifetimeType()) { 7036 7037 Qualifiers::ObjCLifetime lifetime; 7038 7039 // Special cases for arrays: 7040 // - if it's const, use __unsafe_unretained 7041 // - otherwise, it's an error 7042 if (T->isArrayType()) { 7043 if (!T.isConstQualified()) { 7044 DelayedDiagnostics.add( 7045 sema::DelayedDiagnostic::makeForbiddenType( 7046 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 7047 } 7048 lifetime = Qualifiers::OCL_ExplicitNone; 7049 } else { 7050 lifetime = T->getObjCARCImplicitLifetime(); 7051 } 7052 T = Context.getLifetimeQualifiedType(T, lifetime); 7053 } 7054 7055 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 7056 Context.getAdjustedParameterType(T), 7057 TSInfo, 7058 StorageClass, StorageClassAsWritten, 7059 0); 7060 7061 // Parameters can not be abstract class types. 7062 // For record types, this is done by the AbstractClassUsageDiagnoser once 7063 // the class has been completely parsed. 7064 if (!CurContext->isRecord() && 7065 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 7066 AbstractParamType)) 7067 New->setInvalidDecl(); 7068 7069 // Parameter declarators cannot be interface types. All ObjC objects are 7070 // passed by reference. 7071 if (T->isObjCObjectType()) { 7072 Diag(NameLoc, 7073 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 7074 << FixItHint::CreateInsertion(NameLoc, "*"); 7075 T = Context.getObjCObjectPointerType(T); 7076 New->setType(T); 7077 } 7078 7079 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 7080 // duration shall not be qualified by an address-space qualifier." 7081 // Since all parameters have automatic store duration, they can not have 7082 // an address space. 7083 if (T.getAddressSpace() != 0) { 7084 Diag(NameLoc, diag::err_arg_with_address_space); 7085 New->setInvalidDecl(); 7086 } 7087 7088 return New; 7089} 7090 7091void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 7092 SourceLocation LocAfterDecls) { 7093 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 7094 7095 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 7096 // for a K&R function. 7097 if (!FTI.hasPrototype) { 7098 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 7099 --i; 7100 if (FTI.ArgInfo[i].Param == 0) { 7101 SmallString<256> Code; 7102 llvm::raw_svector_ostream(Code) << " int " 7103 << FTI.ArgInfo[i].Ident->getName() 7104 << ";\n"; 7105 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 7106 << FTI.ArgInfo[i].Ident 7107 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 7108 7109 // Implicitly declare the argument as type 'int' for lack of a better 7110 // type. 7111 AttributeFactory attrs; 7112 DeclSpec DS(attrs); 7113 const char* PrevSpec; // unused 7114 unsigned DiagID; // unused 7115 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 7116 PrevSpec, DiagID); 7117 Declarator ParamD(DS, Declarator::KNRTypeListContext); 7118 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 7119 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 7120 } 7121 } 7122 } 7123} 7124 7125Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 7126 Declarator &D) { 7127 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 7128 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 7129 Scope *ParentScope = FnBodyScope->getParent(); 7130 7131 D.setFunctionDefinitionKind(FDK_Definition); 7132 Decl *DP = HandleDeclarator(ParentScope, D, 7133 MultiTemplateParamsArg(*this)); 7134 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7135} 7136 7137static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7138 // Don't warn about invalid declarations. 7139 if (FD->isInvalidDecl()) 7140 return false; 7141 7142 // Or declarations that aren't global. 7143 if (!FD->isGlobal()) 7144 return false; 7145 7146 // Don't warn about C++ member functions. 7147 if (isa<CXXMethodDecl>(FD)) 7148 return false; 7149 7150 // Don't warn about 'main'. 7151 if (FD->isMain()) 7152 return false; 7153 7154 // Don't warn about inline functions. 7155 if (FD->isInlined()) 7156 return false; 7157 7158 // Don't warn about function templates. 7159 if (FD->getDescribedFunctionTemplate()) 7160 return false; 7161 7162 // Don't warn about function template specializations. 7163 if (FD->isFunctionTemplateSpecialization()) 7164 return false; 7165 7166 bool MissingPrototype = true; 7167 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7168 Prev; Prev = Prev->getPreviousDecl()) { 7169 // Ignore any declarations that occur in function or method 7170 // scope, because they aren't visible from the header. 7171 if (Prev->getDeclContext()->isFunctionOrMethod()) 7172 continue; 7173 7174 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7175 break; 7176 } 7177 7178 return MissingPrototype; 7179} 7180 7181void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7182 // Don't complain if we're in GNU89 mode and the previous definition 7183 // was an extern inline function. 7184 const FunctionDecl *Definition; 7185 if (FD->isDefined(Definition) && 7186 !canRedefineFunction(Definition, getLangOpts())) { 7187 if (getLangOpts().GNUMode && Definition->isInlineSpecified() && 7188 Definition->getStorageClass() == SC_Extern) 7189 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7190 << FD->getDeclName() << getLangOpts().CPlusPlus; 7191 else 7192 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7193 Diag(Definition->getLocation(), diag::note_previous_definition); 7194 } 7195} 7196 7197Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7198 // Clear the last template instantiation error context. 7199 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7200 7201 if (!D) 7202 return D; 7203 FunctionDecl *FD = 0; 7204 7205 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7206 FD = FunTmpl->getTemplatedDecl(); 7207 else 7208 FD = cast<FunctionDecl>(D); 7209 7210 // Enter a new function scope 7211 PushFunctionScope(); 7212 7213 // See if this is a redefinition. 7214 if (!FD->isLateTemplateParsed()) 7215 CheckForFunctionRedefinition(FD); 7216 7217 // Builtin functions cannot be defined. 7218 if (unsigned BuiltinID = FD->getBuiltinID()) { 7219 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7220 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7221 FD->setInvalidDecl(); 7222 } 7223 } 7224 7225 // The return type of a function definition must be complete 7226 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7227 QualType ResultType = FD->getResultType(); 7228 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7229 !FD->isInvalidDecl() && 7230 RequireCompleteType(FD->getLocation(), ResultType, 7231 diag::err_func_def_incomplete_result)) 7232 FD->setInvalidDecl(); 7233 7234 // GNU warning -Wmissing-prototypes: 7235 // Warn if a global function is defined without a previous 7236 // prototype declaration. This warning is issued even if the 7237 // definition itself provides a prototype. The aim is to detect 7238 // global functions that fail to be declared in header files. 7239 if (ShouldWarnAboutMissingPrototype(FD)) 7240 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7241 7242 if (FnBodyScope) 7243 PushDeclContext(FnBodyScope, FD); 7244 7245 // Check the validity of our function parameters 7246 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7247 /*CheckParameterNames=*/true); 7248 7249 // Introduce our parameters into the function scope 7250 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7251 ParmVarDecl *Param = FD->getParamDecl(p); 7252 Param->setOwningFunction(FD); 7253 7254 // If this has an identifier, add it to the scope stack. 7255 if (Param->getIdentifier() && FnBodyScope) { 7256 CheckShadow(FnBodyScope, Param); 7257 7258 PushOnScopeChains(Param, FnBodyScope); 7259 } 7260 } 7261 7262 // If we had any tags defined in the function prototype, 7263 // introduce them into the function scope. 7264 if (FnBodyScope) { 7265 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(), 7266 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) { 7267 NamedDecl *D = *I; 7268 7269 // Some of these decls (like enums) may have been pinned to the translation unit 7270 // for lack of a real context earlier. If so, remove from the translation unit 7271 // and reattach to the current context. 7272 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) { 7273 // Is the decl actually in the context? 7274 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(), 7275 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) { 7276 if (*DI == D) { 7277 Context.getTranslationUnitDecl()->removeDecl(D); 7278 break; 7279 } 7280 } 7281 // Either way, reassign the lexical decl context to our FunctionDecl. 7282 D->setLexicalDeclContext(CurContext); 7283 } 7284 7285 // If the decl has a non-null name, make accessible in the current scope. 7286 if (!D->getName().empty()) 7287 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false); 7288 7289 // Similarly, dive into enums and fish their constants out, making them 7290 // accessible in this scope. 7291 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) { 7292 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(), 7293 EE = ED->enumerator_end(); EI != EE; ++EI) 7294 PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false); 7295 } 7296 } 7297 } 7298 7299 // Checking attributes of current function definition 7300 // dllimport attribute. 7301 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7302 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7303 // dllimport attribute cannot be directly applied to definition. 7304 // Microsoft accepts dllimport for functions defined within class scope. 7305 if (!DA->isInherited() && 7306 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7307 Diag(FD->getLocation(), 7308 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7309 << "dllimport"; 7310 FD->setInvalidDecl(); 7311 return FD; 7312 } 7313 7314 // Visual C++ appears to not think this is an issue, so only issue 7315 // a warning when Microsoft extensions are disabled. 7316 if (!LangOpts.MicrosoftExt) { 7317 // If a symbol previously declared dllimport is later defined, the 7318 // attribute is ignored in subsequent references, and a warning is 7319 // emitted. 7320 Diag(FD->getLocation(), 7321 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7322 << FD->getName() << "dllimport"; 7323 } 7324 } 7325 return FD; 7326} 7327 7328/// \brief Given the set of return statements within a function body, 7329/// compute the variables that are subject to the named return value 7330/// optimization. 7331/// 7332/// Each of the variables that is subject to the named return value 7333/// optimization will be marked as NRVO variables in the AST, and any 7334/// return statement that has a marked NRVO variable as its NRVO candidate can 7335/// use the named return value optimization. 7336/// 7337/// This function applies a very simplistic algorithm for NRVO: if every return 7338/// statement in the function has the same NRVO candidate, that candidate is 7339/// the NRVO variable. 7340/// 7341/// FIXME: Employ a smarter algorithm that accounts for multiple return 7342/// statements and the lifetimes of the NRVO candidates. We should be able to 7343/// find a maximal set of NRVO variables. 7344void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7345 ReturnStmt **Returns = Scope->Returns.data(); 7346 7347 const VarDecl *NRVOCandidate = 0; 7348 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7349 if (!Returns[I]->getNRVOCandidate()) 7350 return; 7351 7352 if (!NRVOCandidate) 7353 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7354 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7355 return; 7356 } 7357 7358 if (NRVOCandidate) 7359 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7360} 7361 7362Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7363 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7364} 7365 7366Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7367 bool IsInstantiation) { 7368 FunctionDecl *FD = 0; 7369 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7370 if (FunTmpl) 7371 FD = FunTmpl->getTemplatedDecl(); 7372 else 7373 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7374 7375 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7376 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7377 7378 if (FD) { 7379 FD->setBody(Body); 7380 7381 // If the function implicitly returns zero (like 'main') or is naked, 7382 // don't complain about missing return statements. 7383 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) 7384 WP.disableCheckFallThrough(); 7385 7386 // MSVC permits the use of pure specifier (=0) on function definition, 7387 // defined at class scope, warn about this non standard construct. 7388 if (getLangOpts().MicrosoftExt && FD->isPure()) 7389 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7390 7391 if (!FD->isInvalidDecl()) { 7392 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7393 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7394 FD->getResultType(), FD); 7395 7396 // If this is a constructor, we need a vtable. 7397 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7398 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7399 7400 computeNRVO(Body, getCurFunction()); 7401 } 7402 7403 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 7404 "Function parsing confused"); 7405 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7406 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7407 MD->setBody(Body); 7408 if (Body) 7409 MD->setEndLoc(Body->getLocEnd()); 7410 if (!MD->isInvalidDecl()) { 7411 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7412 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7413 MD->getResultType(), MD); 7414 7415 if (Body) 7416 computeNRVO(Body, getCurFunction()); 7417 } 7418 if (ObjCShouldCallSuperDealloc) { 7419 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7420 ObjCShouldCallSuperDealloc = false; 7421 } 7422 if (ObjCShouldCallSuperFinalize) { 7423 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7424 ObjCShouldCallSuperFinalize = false; 7425 } 7426 } else { 7427 return 0; 7428 } 7429 7430 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7431 "ObjC methods, which should have been handled in the block above."); 7432 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7433 "ObjC methods, which should have been handled in the block above."); 7434 7435 // Verify and clean out per-function state. 7436 if (Body) { 7437 // C++ constructors that have function-try-blocks can't have return 7438 // statements in the handlers of that block. (C++ [except.handle]p14) 7439 // Verify this. 7440 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7441 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7442 7443 // Verify that gotos and switch cases don't jump into scopes illegally. 7444 if (getCurFunction()->NeedsScopeChecking() && 7445 !dcl->isInvalidDecl() && 7446 !hasAnyUnrecoverableErrorsInThisFunction()) 7447 DiagnoseInvalidJumps(Body); 7448 7449 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7450 if (!Destructor->getParent()->isDependentType()) 7451 CheckDestructor(Destructor); 7452 7453 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7454 Destructor->getParent()); 7455 } 7456 7457 // If any errors have occurred, clear out any temporaries that may have 7458 // been leftover. This ensures that these temporaries won't be picked up for 7459 // deletion in some later function. 7460 if (PP.getDiagnostics().hasErrorOccurred() || 7461 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7462 DiscardCleanupsInEvaluationContext(); 7463 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7464 // Since the body is valid, issue any analysis-based warnings that are 7465 // enabled. 7466 ActivePolicy = &WP; 7467 } 7468 7469 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7470 (!CheckConstexprFunctionDecl(FD) || 7471 !CheckConstexprFunctionBody(FD, Body))) 7472 FD->setInvalidDecl(); 7473 7474 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7475 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7476 assert(MaybeODRUseExprs.empty() && 7477 "Leftover expressions for odr-use checking"); 7478 } 7479 7480 if (!IsInstantiation) 7481 PopDeclContext(); 7482 7483 PopFunctionScopeInfo(ActivePolicy, dcl); 7484 7485 // If any errors have occurred, clear out any temporaries that may have 7486 // been leftover. This ensures that these temporaries won't be picked up for 7487 // deletion in some later function. 7488 if (getDiagnostics().hasErrorOccurred()) { 7489 DiscardCleanupsInEvaluationContext(); 7490 } 7491 7492 return dcl; 7493} 7494 7495 7496/// When we finish delayed parsing of an attribute, we must attach it to the 7497/// relevant Decl. 7498void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7499 ParsedAttributes &Attrs) { 7500 // Always attach attributes to the underlying decl. 7501 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7502 D = TD->getTemplatedDecl(); 7503 ProcessDeclAttributeList(S, D, Attrs.getList()); 7504} 7505 7506 7507/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7508/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7509NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7510 IdentifierInfo &II, Scope *S) { 7511 // Before we produce a declaration for an implicitly defined 7512 // function, see whether there was a locally-scoped declaration of 7513 // this name as a function or variable. If so, use that 7514 // (non-visible) declaration, and complain about it. 7515 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7516 = findLocallyScopedExternalDecl(&II); 7517 if (Pos != LocallyScopedExternalDecls.end()) { 7518 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7519 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7520 return Pos->second; 7521 } 7522 7523 // Extension in C99. Legal in C90, but warn about it. 7524 unsigned diag_id; 7525 if (II.getName().startswith("__builtin_")) 7526 diag_id = diag::warn_builtin_unknown; 7527 else if (getLangOpts().C99) 7528 diag_id = diag::ext_implicit_function_decl; 7529 else 7530 diag_id = diag::warn_implicit_function_decl; 7531 Diag(Loc, diag_id) << &II; 7532 7533 // Because typo correction is expensive, only do it if the implicit 7534 // function declaration is going to be treated as an error. 7535 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7536 TypoCorrection Corrected; 7537 DeclFilterCCC<FunctionDecl> Validator; 7538 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7539 LookupOrdinaryName, S, 0, Validator))) { 7540 std::string CorrectedStr = Corrected.getAsString(getLangOpts()); 7541 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts()); 7542 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7543 7544 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7545 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7546 7547 if (Func->getLocation().isValid() 7548 && !II.getName().startswith("__builtin_")) 7549 Diag(Func->getLocation(), diag::note_previous_decl) 7550 << CorrectedQuotedStr; 7551 } 7552 } 7553 7554 // Set a Declarator for the implicit definition: int foo(); 7555 const char *Dummy; 7556 AttributeFactory attrFactory; 7557 DeclSpec DS(attrFactory); 7558 unsigned DiagID; 7559 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7560 (void)Error; // Silence warning. 7561 assert(!Error && "Error setting up implicit decl!"); 7562 Declarator D(DS, Declarator::BlockContext); 7563 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7564 0, 0, true, SourceLocation(), 7565 SourceLocation(), SourceLocation(), 7566 SourceLocation(), 7567 EST_None, SourceLocation(), 7568 0, 0, 0, 0, Loc, Loc, D), 7569 DS.getAttributes(), 7570 SourceLocation()); 7571 D.SetIdentifier(&II, Loc); 7572 7573 // Insert this function into translation-unit scope. 7574 7575 DeclContext *PrevDC = CurContext; 7576 CurContext = Context.getTranslationUnitDecl(); 7577 7578 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7579 FD->setImplicit(); 7580 7581 CurContext = PrevDC; 7582 7583 AddKnownFunctionAttributes(FD); 7584 7585 return FD; 7586} 7587 7588/// \brief Adds any function attributes that we know a priori based on 7589/// the declaration of this function. 7590/// 7591/// These attributes can apply both to implicitly-declared builtins 7592/// (like __builtin___printf_chk) or to library-declared functions 7593/// like NSLog or printf. 7594/// 7595/// We need to check for duplicate attributes both here and where user-written 7596/// attributes are applied to declarations. 7597void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7598 if (FD->isInvalidDecl()) 7599 return; 7600 7601 // If this is a built-in function, map its builtin attributes to 7602 // actual attributes. 7603 if (unsigned BuiltinID = FD->getBuiltinID()) { 7604 // Handle printf-formatting attributes. 7605 unsigned FormatIdx; 7606 bool HasVAListArg; 7607 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7608 if (!FD->getAttr<FormatAttr>()) { 7609 const char *fmt = "printf"; 7610 unsigned int NumParams = FD->getNumParams(); 7611 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7612 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7613 fmt = "NSString"; 7614 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7615 fmt, FormatIdx+1, 7616 HasVAListArg ? 0 : FormatIdx+2)); 7617 } 7618 } 7619 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7620 HasVAListArg)) { 7621 if (!FD->getAttr<FormatAttr>()) 7622 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7623 "scanf", FormatIdx+1, 7624 HasVAListArg ? 0 : FormatIdx+2)); 7625 } 7626 7627 // Mark const if we don't care about errno and that is the only 7628 // thing preventing the function from being const. This allows 7629 // IRgen to use LLVM intrinsics for such functions. 7630 if (!getLangOpts().MathErrno && 7631 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7632 if (!FD->getAttr<ConstAttr>()) 7633 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7634 } 7635 7636 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7637 !FD->getAttr<ReturnsTwiceAttr>()) 7638 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7639 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7640 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7641 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7642 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7643 } 7644 7645 IdentifierInfo *Name = FD->getIdentifier(); 7646 if (!Name) 7647 return; 7648 if ((!getLangOpts().CPlusPlus && 7649 FD->getDeclContext()->isTranslationUnit()) || 7650 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7651 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7652 LinkageSpecDecl::lang_c)) { 7653 // Okay: this could be a libc/libm/Objective-C function we know 7654 // about. 7655 } else 7656 return; 7657 7658 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7659 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7660 // target-specific builtins, perhaps? 7661 if (!FD->getAttr<FormatAttr>()) 7662 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7663 "printf", 2, 7664 Name->isStr("vasprintf") ? 0 : 3)); 7665 } 7666} 7667 7668TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7669 TypeSourceInfo *TInfo) { 7670 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7671 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7672 7673 if (!TInfo) { 7674 assert(D.isInvalidType() && "no declarator info for valid type"); 7675 TInfo = Context.getTrivialTypeSourceInfo(T); 7676 } 7677 7678 // Scope manipulation handled by caller. 7679 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7680 D.getLocStart(), 7681 D.getIdentifierLoc(), 7682 D.getIdentifier(), 7683 TInfo); 7684 7685 // Bail out immediately if we have an invalid declaration. 7686 if (D.isInvalidType()) { 7687 NewTD->setInvalidDecl(); 7688 return NewTD; 7689 } 7690 7691 if (D.getDeclSpec().isModulePrivateSpecified()) { 7692 if (CurContext->isFunctionOrMethod()) 7693 Diag(NewTD->getLocation(), diag::err_module_private_local) 7694 << 2 << NewTD->getDeclName() 7695 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7696 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7697 else 7698 NewTD->setModulePrivate(); 7699 } 7700 7701 // C++ [dcl.typedef]p8: 7702 // If the typedef declaration defines an unnamed class (or 7703 // enum), the first typedef-name declared by the declaration 7704 // to be that class type (or enum type) is used to denote the 7705 // class type (or enum type) for linkage purposes only. 7706 // We need to check whether the type was declared in the declaration. 7707 switch (D.getDeclSpec().getTypeSpecType()) { 7708 case TST_enum: 7709 case TST_struct: 7710 case TST_union: 7711 case TST_class: { 7712 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7713 7714 // Do nothing if the tag is not anonymous or already has an 7715 // associated typedef (from an earlier typedef in this decl group). 7716 if (tagFromDeclSpec->getIdentifier()) break; 7717 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7718 7719 // A well-formed anonymous tag must always be a TUK_Definition. 7720 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7721 7722 // The type must match the tag exactly; no qualifiers allowed. 7723 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7724 break; 7725 7726 // Otherwise, set this is the anon-decl typedef for the tag. 7727 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7728 break; 7729 } 7730 7731 default: 7732 break; 7733 } 7734 7735 return NewTD; 7736} 7737 7738 7739/// \brief Determine whether a tag with a given kind is acceptable 7740/// as a redeclaration of the given tag declaration. 7741/// 7742/// \returns true if the new tag kind is acceptable, false otherwise. 7743bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7744 TagTypeKind NewTag, bool isDefinition, 7745 SourceLocation NewTagLoc, 7746 const IdentifierInfo &Name) { 7747 // C++ [dcl.type.elab]p3: 7748 // The class-key or enum keyword present in the 7749 // elaborated-type-specifier shall agree in kind with the 7750 // declaration to which the name in the elaborated-type-specifier 7751 // refers. This rule also applies to the form of 7752 // elaborated-type-specifier that declares a class-name or 7753 // friend class since it can be construed as referring to the 7754 // definition of the class. Thus, in any 7755 // elaborated-type-specifier, the enum keyword shall be used to 7756 // refer to an enumeration (7.2), the union class-key shall be 7757 // used to refer to a union (clause 9), and either the class or 7758 // struct class-key shall be used to refer to a class (clause 9) 7759 // declared using the class or struct class-key. 7760 TagTypeKind OldTag = Previous->getTagKind(); 7761 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7762 if (OldTag == NewTag) 7763 return true; 7764 7765 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7766 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7767 // Warn about the struct/class tag mismatch. 7768 bool isTemplate = false; 7769 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7770 isTemplate = Record->getDescribedClassTemplate(); 7771 7772 if (!ActiveTemplateInstantiations.empty()) { 7773 // In a template instantiation, do not offer fix-its for tag mismatches 7774 // since they usually mess up the template instead of fixing the problem. 7775 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7776 << (NewTag == TTK_Class) << isTemplate << &Name; 7777 return true; 7778 } 7779 7780 if (isDefinition) { 7781 // On definitions, check previous tags and issue a fix-it for each 7782 // one that doesn't match the current tag. 7783 if (Previous->getDefinition()) { 7784 // Don't suggest fix-its for redefinitions. 7785 return true; 7786 } 7787 7788 bool previousMismatch = false; 7789 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7790 E(Previous->redecls_end()); I != E; ++I) { 7791 if (I->getTagKind() != NewTag) { 7792 if (!previousMismatch) { 7793 previousMismatch = true; 7794 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7795 << (NewTag == TTK_Class) << isTemplate << &Name; 7796 } 7797 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7798 << (NewTag == TTK_Class) 7799 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7800 NewTag == TTK_Class? 7801 "class" : "struct"); 7802 } 7803 } 7804 return true; 7805 } 7806 7807 // Check for a previous definition. If current tag and definition 7808 // are same type, do nothing. If no definition, but disagree with 7809 // with previous tag type, give a warning, but no fix-it. 7810 const TagDecl *Redecl = Previous->getDefinition() ? 7811 Previous->getDefinition() : Previous; 7812 if (Redecl->getTagKind() == NewTag) { 7813 return true; 7814 } 7815 7816 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7817 << (NewTag == TTK_Class) 7818 << isTemplate << &Name; 7819 Diag(Redecl->getLocation(), diag::note_previous_use); 7820 7821 // If there is a previous defintion, suggest a fix-it. 7822 if (Previous->getDefinition()) { 7823 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7824 << (Redecl->getTagKind() == TTK_Class) 7825 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7826 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7827 } 7828 7829 return true; 7830 } 7831 return false; 7832} 7833 7834/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7835/// former case, Name will be non-null. In the later case, Name will be null. 7836/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7837/// reference/declaration/definition of a tag. 7838Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7839 SourceLocation KWLoc, CXXScopeSpec &SS, 7840 IdentifierInfo *Name, SourceLocation NameLoc, 7841 AttributeList *Attr, AccessSpecifier AS, 7842 SourceLocation ModulePrivateLoc, 7843 MultiTemplateParamsArg TemplateParameterLists, 7844 bool &OwnedDecl, bool &IsDependent, 7845 SourceLocation ScopedEnumKWLoc, 7846 bool ScopedEnumUsesClassTag, 7847 TypeResult UnderlyingType) { 7848 // If this is not a definition, it must have a name. 7849 assert((Name != 0 || TUK == TUK_Definition) && 7850 "Nameless record must be a definition!"); 7851 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7852 7853 OwnedDecl = false; 7854 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7855 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 7856 7857 // FIXME: Check explicit specializations more carefully. 7858 bool isExplicitSpecialization = false; 7859 bool Invalid = false; 7860 7861 // We only need to do this matching if we have template parameters 7862 // or a scope specifier, which also conveniently avoids this work 7863 // for non-C++ cases. 7864 if (TemplateParameterLists.size() > 0 || 7865 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7866 if (TemplateParameterList *TemplateParams 7867 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7868 TemplateParameterLists.get(), 7869 TemplateParameterLists.size(), 7870 TUK == TUK_Friend, 7871 isExplicitSpecialization, 7872 Invalid)) { 7873 if (TemplateParams->size() > 0) { 7874 // This is a declaration or definition of a class template (which may 7875 // be a member of another template). 7876 7877 if (Invalid) 7878 return 0; 7879 7880 OwnedDecl = false; 7881 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7882 SS, Name, NameLoc, Attr, 7883 TemplateParams, AS, 7884 ModulePrivateLoc, 7885 TemplateParameterLists.size() - 1, 7886 (TemplateParameterList**) TemplateParameterLists.release()); 7887 return Result.get(); 7888 } else { 7889 // The "template<>" header is extraneous. 7890 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7891 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7892 isExplicitSpecialization = true; 7893 } 7894 } 7895 } 7896 7897 // Figure out the underlying type if this a enum declaration. We need to do 7898 // this early, because it's needed to detect if this is an incompatible 7899 // redeclaration. 7900 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7901 7902 if (Kind == TTK_Enum) { 7903 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7904 // No underlying type explicitly specified, or we failed to parse the 7905 // type, default to int. 7906 EnumUnderlying = Context.IntTy.getTypePtr(); 7907 else if (UnderlyingType.get()) { 7908 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7909 // integral type; any cv-qualification is ignored. 7910 TypeSourceInfo *TI = 0; 7911 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7912 EnumUnderlying = TI; 7913 7914 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7915 7916 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7917 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7918 << T; 7919 // Recover by falling back to int. 7920 EnumUnderlying = Context.IntTy.getTypePtr(); 7921 } 7922 7923 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7924 UPPC_FixedUnderlyingType)) 7925 EnumUnderlying = Context.IntTy.getTypePtr(); 7926 7927 } else if (getLangOpts().MicrosoftMode) 7928 // Microsoft enums are always of int type. 7929 EnumUnderlying = Context.IntTy.getTypePtr(); 7930 } 7931 7932 DeclContext *SearchDC = CurContext; 7933 DeclContext *DC = CurContext; 7934 bool isStdBadAlloc = false; 7935 7936 RedeclarationKind Redecl = ForRedeclaration; 7937 if (TUK == TUK_Friend || TUK == TUK_Reference) 7938 Redecl = NotForRedeclaration; 7939 7940 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7941 7942 if (Name && SS.isNotEmpty()) { 7943 // We have a nested-name tag ('struct foo::bar'). 7944 7945 // Check for invalid 'foo::'. 7946 if (SS.isInvalid()) { 7947 Name = 0; 7948 goto CreateNewDecl; 7949 } 7950 7951 // If this is a friend or a reference to a class in a dependent 7952 // context, don't try to make a decl for it. 7953 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7954 DC = computeDeclContext(SS, false); 7955 if (!DC) { 7956 IsDependent = true; 7957 return 0; 7958 } 7959 } else { 7960 DC = computeDeclContext(SS, true); 7961 if (!DC) { 7962 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7963 << SS.getRange(); 7964 return 0; 7965 } 7966 } 7967 7968 if (RequireCompleteDeclContext(SS, DC)) 7969 return 0; 7970 7971 SearchDC = DC; 7972 // Look-up name inside 'foo::'. 7973 LookupQualifiedName(Previous, DC); 7974 7975 if (Previous.isAmbiguous()) 7976 return 0; 7977 7978 if (Previous.empty()) { 7979 // Name lookup did not find anything. However, if the 7980 // nested-name-specifier refers to the current instantiation, 7981 // and that current instantiation has any dependent base 7982 // classes, we might find something at instantiation time: treat 7983 // this as a dependent elaborated-type-specifier. 7984 // But this only makes any sense for reference-like lookups. 7985 if (Previous.wasNotFoundInCurrentInstantiation() && 7986 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7987 IsDependent = true; 7988 return 0; 7989 } 7990 7991 // A tag 'foo::bar' must already exist. 7992 Diag(NameLoc, diag::err_not_tag_in_scope) 7993 << Kind << Name << DC << SS.getRange(); 7994 Name = 0; 7995 Invalid = true; 7996 goto CreateNewDecl; 7997 } 7998 } else if (Name) { 7999 // If this is a named struct, check to see if there was a previous forward 8000 // declaration or definition. 8001 // FIXME: We're looking into outer scopes here, even when we 8002 // shouldn't be. Doing so can result in ambiguities that we 8003 // shouldn't be diagnosing. 8004 LookupName(Previous, S); 8005 8006 if (Previous.isAmbiguous() && 8007 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 8008 LookupResult::Filter F = Previous.makeFilter(); 8009 while (F.hasNext()) { 8010 NamedDecl *ND = F.next(); 8011 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 8012 F.erase(); 8013 } 8014 F.done(); 8015 } 8016 8017 // Note: there used to be some attempt at recovery here. 8018 if (Previous.isAmbiguous()) 8019 return 0; 8020 8021 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) { 8022 // FIXME: This makes sure that we ignore the contexts associated 8023 // with C structs, unions, and enums when looking for a matching 8024 // tag declaration or definition. See the similar lookup tweak 8025 // in Sema::LookupName; is there a better way to deal with this? 8026 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 8027 SearchDC = SearchDC->getParent(); 8028 } 8029 } else if (S->isFunctionPrototypeScope()) { 8030 // If this is an enum declaration in function prototype scope, set its 8031 // initial context to the translation unit. 8032 // FIXME: [citation needed] 8033 SearchDC = Context.getTranslationUnitDecl(); 8034 } 8035 8036 if (Previous.isSingleResult() && 8037 Previous.getFoundDecl()->isTemplateParameter()) { 8038 // Maybe we will complain about the shadowed template parameter. 8039 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 8040 // Just pretend that we didn't see the previous declaration. 8041 Previous.clear(); 8042 } 8043 8044 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace && 8045 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 8046 // This is a declaration of or a reference to "std::bad_alloc". 8047 isStdBadAlloc = true; 8048 8049 if (Previous.empty() && StdBadAlloc) { 8050 // std::bad_alloc has been implicitly declared (but made invisible to 8051 // name lookup). Fill in this implicit declaration as the previous 8052 // declaration, so that the declarations get chained appropriately. 8053 Previous.addDecl(getStdBadAlloc()); 8054 } 8055 } 8056 8057 // If we didn't find a previous declaration, and this is a reference 8058 // (or friend reference), move to the correct scope. In C++, we 8059 // also need to do a redeclaration lookup there, just in case 8060 // there's a shadow friend decl. 8061 if (Name && Previous.empty() && 8062 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8063 if (Invalid) goto CreateNewDecl; 8064 assert(SS.isEmpty()); 8065 8066 if (TUK == TUK_Reference) { 8067 // C++ [basic.scope.pdecl]p5: 8068 // -- for an elaborated-type-specifier of the form 8069 // 8070 // class-key identifier 8071 // 8072 // if the elaborated-type-specifier is used in the 8073 // decl-specifier-seq or parameter-declaration-clause of a 8074 // function defined in namespace scope, the identifier is 8075 // declared as a class-name in the namespace that contains 8076 // the declaration; otherwise, except as a friend 8077 // declaration, the identifier is declared in the smallest 8078 // non-class, non-function-prototype scope that contains the 8079 // declaration. 8080 // 8081 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 8082 // C structs and unions. 8083 // 8084 // It is an error in C++ to declare (rather than define) an enum 8085 // type, including via an elaborated type specifier. We'll 8086 // diagnose that later; for now, declare the enum in the same 8087 // scope as we would have picked for any other tag type. 8088 // 8089 // GNU C also supports this behavior as part of its incomplete 8090 // enum types extension, while GNU C++ does not. 8091 // 8092 // Find the context where we'll be declaring the tag. 8093 // FIXME: We would like to maintain the current DeclContext as the 8094 // lexical context, 8095 while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod()) 8096 SearchDC = SearchDC->getParent(); 8097 8098 // Find the scope where we'll be declaring the tag. 8099 while (S->isClassScope() || 8100 (getLangOpts().CPlusPlus && 8101 S->isFunctionPrototypeScope()) || 8102 ((S->getFlags() & Scope::DeclScope) == 0) || 8103 (S->getEntity() && 8104 ((DeclContext *)S->getEntity())->isTransparentContext())) 8105 S = S->getParent(); 8106 } else { 8107 assert(TUK == TUK_Friend); 8108 // C++ [namespace.memdef]p3: 8109 // If a friend declaration in a non-local class first declares a 8110 // class or function, the friend class or function is a member of 8111 // the innermost enclosing namespace. 8112 SearchDC = SearchDC->getEnclosingNamespaceContext(); 8113 } 8114 8115 // In C++, we need to do a redeclaration lookup to properly 8116 // diagnose some problems. 8117 if (getLangOpts().CPlusPlus) { 8118 Previous.setRedeclarationKind(ForRedeclaration); 8119 LookupQualifiedName(Previous, SearchDC); 8120 } 8121 } 8122 8123 if (!Previous.empty()) { 8124 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 8125 8126 // It's okay to have a tag decl in the same scope as a typedef 8127 // which hides a tag decl in the same scope. Finding this 8128 // insanity with a redeclaration lookup can only actually happen 8129 // in C++. 8130 // 8131 // This is also okay for elaborated-type-specifiers, which is 8132 // technically forbidden by the current standard but which is 8133 // okay according to the likely resolution of an open issue; 8134 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 8135 if (getLangOpts().CPlusPlus) { 8136 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8137 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 8138 TagDecl *Tag = TT->getDecl(); 8139 if (Tag->getDeclName() == Name && 8140 Tag->getDeclContext()->getRedeclContext() 8141 ->Equals(TD->getDeclContext()->getRedeclContext())) { 8142 PrevDecl = Tag; 8143 Previous.clear(); 8144 Previous.addDecl(Tag); 8145 Previous.resolveKind(); 8146 } 8147 } 8148 } 8149 } 8150 8151 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 8152 // If this is a use of a previous tag, or if the tag is already declared 8153 // in the same scope (so that the definition/declaration completes or 8154 // rementions the tag), reuse the decl. 8155 if (TUK == TUK_Reference || TUK == TUK_Friend || 8156 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 8157 // Make sure that this wasn't declared as an enum and now used as a 8158 // struct or something similar. 8159 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 8160 TUK == TUK_Definition, KWLoc, 8161 *Name)) { 8162 bool SafeToContinue 8163 = (PrevTagDecl->getTagKind() != TTK_Enum && 8164 Kind != TTK_Enum); 8165 if (SafeToContinue) 8166 Diag(KWLoc, diag::err_use_with_wrong_tag) 8167 << Name 8168 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8169 PrevTagDecl->getKindName()); 8170 else 8171 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8172 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8173 8174 if (SafeToContinue) 8175 Kind = PrevTagDecl->getTagKind(); 8176 else { 8177 // Recover by making this an anonymous redefinition. 8178 Name = 0; 8179 Previous.clear(); 8180 Invalid = true; 8181 } 8182 } 8183 8184 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8185 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8186 8187 // If this is an elaborated-type-specifier for a scoped enumeration, 8188 // the 'class' keyword is not necessary and not permitted. 8189 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8190 if (ScopedEnum) 8191 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8192 << PrevEnum->isScoped() 8193 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8194 return PrevTagDecl; 8195 } 8196 8197 // All conflicts with previous declarations are recovered by 8198 // returning the previous declaration. 8199 if (ScopedEnum != PrevEnum->isScoped()) { 8200 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 8201 << PrevEnum->isScoped(); 8202 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8203 return PrevTagDecl; 8204 } 8205 else if (EnumUnderlying && PrevEnum->isFixed()) { 8206 QualType T; 8207 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8208 T = TI->getType(); 8209 else 8210 T = QualType(EnumUnderlying.get<const Type*>(), 0); 8211 8212 if (!Context.hasSameUnqualifiedType(T, 8213 PrevEnum->getIntegerType())) { 8214 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 8215 diag::err_enum_redeclare_type_mismatch) 8216 << T 8217 << PrevEnum->getIntegerType(); 8218 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8219 return PrevTagDecl; 8220 } 8221 } 8222 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 8223 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 8224 << PrevEnum->isFixed(); 8225 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8226 return PrevTagDecl; 8227 } 8228 } 8229 8230 if (!Invalid) { 8231 // If this is a use, just return the declaration we found. 8232 8233 // FIXME: In the future, return a variant or some other clue 8234 // for the consumer of this Decl to know it doesn't own it. 8235 // For our current ASTs this shouldn't be a problem, but will 8236 // need to be changed with DeclGroups. 8237 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8238 getLangOpts().MicrosoftExt)) || TUK == TUK_Friend) 8239 return PrevTagDecl; 8240 8241 // Diagnose attempts to redefine a tag. 8242 if (TUK == TUK_Definition) { 8243 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8244 // If we're defining a specialization and the previous definition 8245 // is from an implicit instantiation, don't emit an error 8246 // here; we'll catch this in the general case below. 8247 if (!isExplicitSpecialization || 8248 !isa<CXXRecordDecl>(Def) || 8249 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 8250 == TSK_ExplicitSpecialization) { 8251 // A redeclaration in function prototype scope in C isn't 8252 // visible elsewhere, so merely issue a warning. 8253 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope()) 8254 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name; 8255 else 8256 Diag(NameLoc, diag::err_redefinition) << Name; 8257 Diag(Def->getLocation(), diag::note_previous_definition); 8258 // If this is a redefinition, recover by making this 8259 // struct be anonymous, which will make any later 8260 // references get the previous definition. 8261 Name = 0; 8262 Previous.clear(); 8263 Invalid = true; 8264 } 8265 } else { 8266 // If the type is currently being defined, complain 8267 // about a nested redefinition. 8268 const TagType *Tag 8269 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8270 if (Tag->isBeingDefined()) { 8271 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8272 Diag(PrevTagDecl->getLocation(), 8273 diag::note_previous_definition); 8274 Name = 0; 8275 Previous.clear(); 8276 Invalid = true; 8277 } 8278 } 8279 8280 // Okay, this is definition of a previously declared or referenced 8281 // tag PrevDecl. We're going to create a new Decl for it. 8282 } 8283 } 8284 // If we get here we have (another) forward declaration or we 8285 // have a definition. Just create a new decl. 8286 8287 } else { 8288 // If we get here, this is a definition of a new tag type in a nested 8289 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8290 // new decl/type. We set PrevDecl to NULL so that the entities 8291 // have distinct types. 8292 Previous.clear(); 8293 } 8294 // If we get here, we're going to create a new Decl. If PrevDecl 8295 // is non-NULL, it's a definition of the tag declared by 8296 // PrevDecl. If it's NULL, we have a new definition. 8297 8298 8299 // Otherwise, PrevDecl is not a tag, but was found with tag 8300 // lookup. This is only actually possible in C++, where a few 8301 // things like templates still live in the tag namespace. 8302 } else { 8303 // Use a better diagnostic if an elaborated-type-specifier 8304 // found the wrong kind of type on the first 8305 // (non-redeclaration) lookup. 8306 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8307 !Previous.isForRedeclaration()) { 8308 unsigned Kind = 0; 8309 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8310 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8311 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8312 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8313 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8314 Invalid = true; 8315 8316 // Otherwise, only diagnose if the declaration is in scope. 8317 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8318 isExplicitSpecialization)) { 8319 // do nothing 8320 8321 // Diagnose implicit declarations introduced by elaborated types. 8322 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8323 unsigned Kind = 0; 8324 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8325 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8326 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8327 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8328 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8329 Invalid = true; 8330 8331 // Otherwise it's a declaration. Call out a particularly common 8332 // case here. 8333 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8334 unsigned Kind = 0; 8335 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8336 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8337 << Name << Kind << TND->getUnderlyingType(); 8338 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8339 Invalid = true; 8340 8341 // Otherwise, diagnose. 8342 } else { 8343 // The tag name clashes with something else in the target scope, 8344 // issue an error and recover by making this tag be anonymous. 8345 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8346 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8347 Name = 0; 8348 Invalid = true; 8349 } 8350 8351 // The existing declaration isn't relevant to us; we're in a 8352 // new scope, so clear out the previous declaration. 8353 Previous.clear(); 8354 } 8355 } 8356 8357CreateNewDecl: 8358 8359 TagDecl *PrevDecl = 0; 8360 if (Previous.isSingleResult()) 8361 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8362 8363 // If there is an identifier, use the location of the identifier as the 8364 // location of the decl, otherwise use the location of the struct/union 8365 // keyword. 8366 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8367 8368 // Otherwise, create a new declaration. If there is a previous 8369 // declaration of the same entity, the two will be linked via 8370 // PrevDecl. 8371 TagDecl *New; 8372 8373 bool IsForwardReference = false; 8374 if (Kind == TTK_Enum) { 8375 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8376 // enum X { A, B, C } D; D should chain to X. 8377 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8378 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8379 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8380 // If this is an undefined enum, warn. 8381 if (TUK != TUK_Definition && !Invalid) { 8382 TagDecl *Def; 8383 if (getLangOpts().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8384 // C++0x: 7.2p2: opaque-enum-declaration. 8385 // Conflicts are diagnosed above. Do nothing. 8386 } 8387 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8388 Diag(Loc, diag::ext_forward_ref_enum_def) 8389 << New; 8390 Diag(Def->getLocation(), diag::note_previous_definition); 8391 } else { 8392 unsigned DiagID = diag::ext_forward_ref_enum; 8393 if (getLangOpts().MicrosoftMode) 8394 DiagID = diag::ext_ms_forward_ref_enum; 8395 else if (getLangOpts().CPlusPlus) 8396 DiagID = diag::err_forward_ref_enum; 8397 Diag(Loc, DiagID); 8398 8399 // If this is a forward-declared reference to an enumeration, make a 8400 // note of it; we won't actually be introducing the declaration into 8401 // the declaration context. 8402 if (TUK == TUK_Reference) 8403 IsForwardReference = true; 8404 } 8405 } 8406 8407 if (EnumUnderlying) { 8408 EnumDecl *ED = cast<EnumDecl>(New); 8409 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8410 ED->setIntegerTypeSourceInfo(TI); 8411 else 8412 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8413 ED->setPromotionType(ED->getIntegerType()); 8414 } 8415 8416 } else { 8417 // struct/union/class 8418 8419 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8420 // struct X { int A; } D; D should chain to X. 8421 if (getLangOpts().CPlusPlus) { 8422 // FIXME: Look for a way to use RecordDecl for simple structs. 8423 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8424 cast_or_null<CXXRecordDecl>(PrevDecl)); 8425 8426 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8427 StdBadAlloc = cast<CXXRecordDecl>(New); 8428 } else 8429 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8430 cast_or_null<RecordDecl>(PrevDecl)); 8431 } 8432 8433 // Maybe add qualifier info. 8434 if (SS.isNotEmpty()) { 8435 if (SS.isSet()) { 8436 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8437 if (TemplateParameterLists.size() > 0) { 8438 New->setTemplateParameterListsInfo(Context, 8439 TemplateParameterLists.size(), 8440 (TemplateParameterList**) TemplateParameterLists.release()); 8441 } 8442 } 8443 else 8444 Invalid = true; 8445 } 8446 8447 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8448 // Add alignment attributes if necessary; these attributes are checked when 8449 // the ASTContext lays out the structure. 8450 // 8451 // It is important for implementing the correct semantics that this 8452 // happen here (in act on tag decl). The #pragma pack stack is 8453 // maintained as a result of parser callbacks which can occur at 8454 // many points during the parsing of a struct declaration (because 8455 // the #pragma tokens are effectively skipped over during the 8456 // parsing of the struct). 8457 AddAlignmentAttributesForRecord(RD); 8458 8459 AddMsStructLayoutForRecord(RD); 8460 } 8461 8462 if (ModulePrivateLoc.isValid()) { 8463 if (isExplicitSpecialization) 8464 Diag(New->getLocation(), diag::err_module_private_specialization) 8465 << 2 8466 << FixItHint::CreateRemoval(ModulePrivateLoc); 8467 // __module_private__ does not apply to local classes. However, we only 8468 // diagnose this as an error when the declaration specifiers are 8469 // freestanding. Here, we just ignore the __module_private__. 8470 else if (!SearchDC->isFunctionOrMethod()) 8471 New->setModulePrivate(); 8472 } 8473 8474 // If this is a specialization of a member class (of a class template), 8475 // check the specialization. 8476 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8477 Invalid = true; 8478 8479 if (Invalid) 8480 New->setInvalidDecl(); 8481 8482 if (Attr) 8483 ProcessDeclAttributeList(S, New, Attr); 8484 8485 // If we're declaring or defining a tag in function prototype scope 8486 // in C, note that this type can only be used within the function. 8487 if (Name && S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus) 8488 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8489 8490 // Set the lexical context. If the tag has a C++ scope specifier, the 8491 // lexical context will be different from the semantic context. 8492 New->setLexicalDeclContext(CurContext); 8493 8494 // Mark this as a friend decl if applicable. 8495 // In Microsoft mode, a friend declaration also acts as a forward 8496 // declaration so we always pass true to setObjectOfFriendDecl to make 8497 // the tag name visible. 8498 if (TUK == TUK_Friend) 8499 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8500 getLangOpts().MicrosoftExt); 8501 8502 // Set the access specifier. 8503 if (!Invalid && SearchDC->isRecord()) 8504 SetMemberAccessSpecifier(New, PrevDecl, AS); 8505 8506 if (TUK == TUK_Definition) 8507 New->startDefinition(); 8508 8509 // If this has an identifier, add it to the scope stack. 8510 if (TUK == TUK_Friend) { 8511 // We might be replacing an existing declaration in the lookup tables; 8512 // if so, borrow its access specifier. 8513 if (PrevDecl) 8514 New->setAccess(PrevDecl->getAccess()); 8515 8516 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8517 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8518 if (Name) // can be null along some error paths 8519 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8520 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8521 } else if (Name) { 8522 S = getNonFieldDeclScope(S); 8523 PushOnScopeChains(New, S, !IsForwardReference); 8524 if (IsForwardReference) 8525 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8526 8527 } else { 8528 CurContext->addDecl(New); 8529 } 8530 8531 // If this is the C FILE type, notify the AST context. 8532 if (IdentifierInfo *II = New->getIdentifier()) 8533 if (!New->isInvalidDecl() && 8534 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8535 II->isStr("FILE")) 8536 Context.setFILEDecl(New); 8537 8538 // If we were in function prototype scope (and not in C++ mode), add this 8539 // tag to the list of decls to inject into the function definition scope. 8540 if (S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus && 8541 InFunctionDeclarator && Name) 8542 DeclsInPrototypeScope.push_back(New); 8543 8544 OwnedDecl = true; 8545 return New; 8546} 8547 8548void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8549 AdjustDeclIfTemplate(TagD); 8550 TagDecl *Tag = cast<TagDecl>(TagD); 8551 8552 // Enter the tag context. 8553 PushDeclContext(S, Tag); 8554} 8555 8556Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8557 assert(isa<ObjCContainerDecl>(IDecl) && 8558 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8559 DeclContext *OCD = cast<DeclContext>(IDecl); 8560 assert(getContainingDC(OCD) == CurContext && 8561 "The next DeclContext should be lexically contained in the current one."); 8562 CurContext = OCD; 8563 return IDecl; 8564} 8565 8566void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8567 SourceLocation FinalLoc, 8568 SourceLocation LBraceLoc) { 8569 AdjustDeclIfTemplate(TagD); 8570 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8571 8572 FieldCollector->StartClass(); 8573 8574 if (!Record->getIdentifier()) 8575 return; 8576 8577 if (FinalLoc.isValid()) 8578 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8579 8580 // C++ [class]p2: 8581 // [...] The class-name is also inserted into the scope of the 8582 // class itself; this is known as the injected-class-name. For 8583 // purposes of access checking, the injected-class-name is treated 8584 // as if it were a public member name. 8585 CXXRecordDecl *InjectedClassName 8586 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8587 Record->getLocStart(), Record->getLocation(), 8588 Record->getIdentifier(), 8589 /*PrevDecl=*/0, 8590 /*DelayTypeCreation=*/true); 8591 Context.getTypeDeclType(InjectedClassName, Record); 8592 InjectedClassName->setImplicit(); 8593 InjectedClassName->setAccess(AS_public); 8594 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8595 InjectedClassName->setDescribedClassTemplate(Template); 8596 PushOnScopeChains(InjectedClassName, S); 8597 assert(InjectedClassName->isInjectedClassName() && 8598 "Broken injected-class-name"); 8599} 8600 8601void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8602 SourceLocation RBraceLoc) { 8603 AdjustDeclIfTemplate(TagD); 8604 TagDecl *Tag = cast<TagDecl>(TagD); 8605 Tag->setRBraceLoc(RBraceLoc); 8606 8607 // Make sure we "complete" the definition even it is invalid. 8608 if (Tag->isBeingDefined()) { 8609 assert(Tag->isInvalidDecl() && "We should already have completed it"); 8610 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 8611 RD->completeDefinition(); 8612 } 8613 8614 if (isa<CXXRecordDecl>(Tag)) 8615 FieldCollector->FinishClass(); 8616 8617 // Exit this scope of this tag's definition. 8618 PopDeclContext(); 8619 8620 // Notify the consumer that we've defined a tag. 8621 Consumer.HandleTagDeclDefinition(Tag); 8622} 8623 8624void Sema::ActOnObjCContainerFinishDefinition() { 8625 // Exit this scope of this interface definition. 8626 PopDeclContext(); 8627} 8628 8629void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8630 assert(DC == CurContext && "Mismatch of container contexts"); 8631 OriginalLexicalContext = DC; 8632 ActOnObjCContainerFinishDefinition(); 8633} 8634 8635void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8636 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8637 OriginalLexicalContext = 0; 8638} 8639 8640void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8641 AdjustDeclIfTemplate(TagD); 8642 TagDecl *Tag = cast<TagDecl>(TagD); 8643 Tag->setInvalidDecl(); 8644 8645 // Make sure we "complete" the definition even it is invalid. 8646 if (Tag->isBeingDefined()) { 8647 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 8648 RD->completeDefinition(); 8649 } 8650 8651 // We're undoing ActOnTagStartDefinition here, not 8652 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8653 // the FieldCollector. 8654 8655 PopDeclContext(); 8656} 8657 8658// Note that FieldName may be null for anonymous bitfields. 8659ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 8660 IdentifierInfo *FieldName, 8661 QualType FieldTy, Expr *BitWidth, 8662 bool *ZeroWidth) { 8663 // Default to true; that shouldn't confuse checks for emptiness 8664 if (ZeroWidth) 8665 *ZeroWidth = true; 8666 8667 // C99 6.7.2.1p4 - verify the field type. 8668 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8669 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8670 // Handle incomplete types with specific error. 8671 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8672 return ExprError(); 8673 if (FieldName) 8674 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8675 << FieldName << FieldTy << BitWidth->getSourceRange(); 8676 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8677 << FieldTy << BitWidth->getSourceRange(); 8678 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8679 UPPC_BitFieldWidth)) 8680 return ExprError(); 8681 8682 // If the bit-width is type- or value-dependent, don't try to check 8683 // it now. 8684 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8685 return Owned(BitWidth); 8686 8687 llvm::APSInt Value; 8688 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 8689 if (ICE.isInvalid()) 8690 return ICE; 8691 BitWidth = ICE.take(); 8692 8693 if (Value != 0 && ZeroWidth) 8694 *ZeroWidth = false; 8695 8696 // Zero-width bitfield is ok for anonymous field. 8697 if (Value == 0 && FieldName) 8698 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8699 8700 if (Value.isSigned() && Value.isNegative()) { 8701 if (FieldName) 8702 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8703 << FieldName << Value.toString(10); 8704 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8705 << Value.toString(10); 8706 } 8707 8708 if (!FieldTy->isDependentType()) { 8709 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8710 if (Value.getZExtValue() > TypeSize) { 8711 if (!getLangOpts().CPlusPlus) { 8712 if (FieldName) 8713 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8714 << FieldName << (unsigned)Value.getZExtValue() 8715 << (unsigned)TypeSize; 8716 8717 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8718 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8719 } 8720 8721 if (FieldName) 8722 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8723 << FieldName << (unsigned)Value.getZExtValue() 8724 << (unsigned)TypeSize; 8725 else 8726 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8727 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8728 } 8729 } 8730 8731 return Owned(BitWidth); 8732} 8733 8734/// ActOnField - Each field of a C struct/union is passed into this in order 8735/// to create a FieldDecl object for it. 8736Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8737 Declarator &D, Expr *BitfieldWidth) { 8738 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8739 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8740 /*HasInit=*/false, AS_public); 8741 return Res; 8742} 8743 8744/// HandleField - Analyze a field of a C struct or a C++ data member. 8745/// 8746FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8747 SourceLocation DeclStart, 8748 Declarator &D, Expr *BitWidth, bool HasInit, 8749 AccessSpecifier AS) { 8750 IdentifierInfo *II = D.getIdentifier(); 8751 SourceLocation Loc = DeclStart; 8752 if (II) Loc = D.getIdentifierLoc(); 8753 8754 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8755 QualType T = TInfo->getType(); 8756 if (getLangOpts().CPlusPlus) { 8757 CheckExtraCXXDefaultArguments(D); 8758 8759 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8760 UPPC_DataMemberType)) { 8761 D.setInvalidType(); 8762 T = Context.IntTy; 8763 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8764 } 8765 } 8766 8767 DiagnoseFunctionSpecifiers(D); 8768 8769 if (D.getDeclSpec().isThreadSpecified()) 8770 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8771 if (D.getDeclSpec().isConstexprSpecified()) 8772 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8773 << 2; 8774 8775 // Check to see if this name was declared as a member previously 8776 NamedDecl *PrevDecl = 0; 8777 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8778 LookupName(Previous, S); 8779 switch (Previous.getResultKind()) { 8780 case LookupResult::Found: 8781 case LookupResult::FoundUnresolvedValue: 8782 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8783 break; 8784 8785 case LookupResult::FoundOverloaded: 8786 PrevDecl = Previous.getRepresentativeDecl(); 8787 break; 8788 8789 case LookupResult::NotFound: 8790 case LookupResult::NotFoundInCurrentInstantiation: 8791 case LookupResult::Ambiguous: 8792 break; 8793 } 8794 Previous.suppressDiagnostics(); 8795 8796 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8797 // Maybe we will complain about the shadowed template parameter. 8798 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8799 // Just pretend that we didn't see the previous declaration. 8800 PrevDecl = 0; 8801 } 8802 8803 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8804 PrevDecl = 0; 8805 8806 bool Mutable 8807 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8808 SourceLocation TSSL = D.getLocStart(); 8809 FieldDecl *NewFD 8810 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8811 TSSL, AS, PrevDecl, &D); 8812 8813 if (NewFD->isInvalidDecl()) 8814 Record->setInvalidDecl(); 8815 8816 if (D.getDeclSpec().isModulePrivateSpecified()) 8817 NewFD->setModulePrivate(); 8818 8819 if (NewFD->isInvalidDecl() && PrevDecl) { 8820 // Don't introduce NewFD into scope; there's already something 8821 // with the same name in the same scope. 8822 } else if (II) { 8823 PushOnScopeChains(NewFD, S); 8824 } else 8825 Record->addDecl(NewFD); 8826 8827 return NewFD; 8828} 8829 8830/// \brief Build a new FieldDecl and check its well-formedness. 8831/// 8832/// This routine builds a new FieldDecl given the fields name, type, 8833/// record, etc. \p PrevDecl should refer to any previous declaration 8834/// with the same name and in the same scope as the field to be 8835/// created. 8836/// 8837/// \returns a new FieldDecl. 8838/// 8839/// \todo The Declarator argument is a hack. It will be removed once 8840FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8841 TypeSourceInfo *TInfo, 8842 RecordDecl *Record, SourceLocation Loc, 8843 bool Mutable, Expr *BitWidth, bool HasInit, 8844 SourceLocation TSSL, 8845 AccessSpecifier AS, NamedDecl *PrevDecl, 8846 Declarator *D) { 8847 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8848 bool InvalidDecl = false; 8849 if (D) InvalidDecl = D->isInvalidType(); 8850 8851 // If we receive a broken type, recover by assuming 'int' and 8852 // marking this declaration as invalid. 8853 if (T.isNull()) { 8854 InvalidDecl = true; 8855 T = Context.IntTy; 8856 } 8857 8858 QualType EltTy = Context.getBaseElementType(T); 8859 if (!EltTy->isDependentType()) { 8860 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8861 // Fields of incomplete type force their record to be invalid. 8862 Record->setInvalidDecl(); 8863 InvalidDecl = true; 8864 } else { 8865 NamedDecl *Def; 8866 EltTy->isIncompleteType(&Def); 8867 if (Def && Def->isInvalidDecl()) { 8868 Record->setInvalidDecl(); 8869 InvalidDecl = true; 8870 } 8871 } 8872 } 8873 8874 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8875 // than a variably modified type. 8876 if (!InvalidDecl && T->isVariablyModifiedType()) { 8877 bool SizeIsNegative; 8878 llvm::APSInt Oversized; 8879 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8880 SizeIsNegative, 8881 Oversized); 8882 if (!FixedTy.isNull()) { 8883 Diag(Loc, diag::warn_illegal_constant_array_size); 8884 T = FixedTy; 8885 } else { 8886 if (SizeIsNegative) 8887 Diag(Loc, diag::err_typecheck_negative_array_size); 8888 else if (Oversized.getBoolValue()) 8889 Diag(Loc, diag::err_array_too_large) 8890 << Oversized.toString(10); 8891 else 8892 Diag(Loc, diag::err_typecheck_field_variable_size); 8893 InvalidDecl = true; 8894 } 8895 } 8896 8897 // Fields can not have abstract class types 8898 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8899 diag::err_abstract_type_in_decl, 8900 AbstractFieldType)) 8901 InvalidDecl = true; 8902 8903 bool ZeroWidth = false; 8904 // If this is declared as a bit-field, check the bit-field. 8905 if (!InvalidDecl && BitWidth) { 8906 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 8907 if (!BitWidth) { 8908 InvalidDecl = true; 8909 BitWidth = 0; 8910 ZeroWidth = false; 8911 } 8912 } 8913 8914 // Check that 'mutable' is consistent with the type of the declaration. 8915 if (!InvalidDecl && Mutable) { 8916 unsigned DiagID = 0; 8917 if (T->isReferenceType()) 8918 DiagID = diag::err_mutable_reference; 8919 else if (T.isConstQualified()) 8920 DiagID = diag::err_mutable_const; 8921 8922 if (DiagID) { 8923 SourceLocation ErrLoc = Loc; 8924 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8925 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8926 Diag(ErrLoc, DiagID); 8927 Mutable = false; 8928 InvalidDecl = true; 8929 } 8930 } 8931 8932 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8933 BitWidth, Mutable, HasInit); 8934 if (InvalidDecl) 8935 NewFD->setInvalidDecl(); 8936 8937 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8938 Diag(Loc, diag::err_duplicate_member) << II; 8939 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8940 NewFD->setInvalidDecl(); 8941 } 8942 8943 if (!InvalidDecl && getLangOpts().CPlusPlus) { 8944 if (Record->isUnion()) { 8945 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8946 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8947 if (RDecl->getDefinition()) { 8948 // C++ [class.union]p1: An object of a class with a non-trivial 8949 // constructor, a non-trivial copy constructor, a non-trivial 8950 // destructor, or a non-trivial copy assignment operator 8951 // cannot be a member of a union, nor can an array of such 8952 // objects. 8953 if (CheckNontrivialField(NewFD)) 8954 NewFD->setInvalidDecl(); 8955 } 8956 } 8957 8958 // C++ [class.union]p1: If a union contains a member of reference type, 8959 // the program is ill-formed. 8960 if (EltTy->isReferenceType()) { 8961 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8962 << NewFD->getDeclName() << EltTy; 8963 NewFD->setInvalidDecl(); 8964 } 8965 } 8966 } 8967 8968 // FIXME: We need to pass in the attributes given an AST 8969 // representation, not a parser representation. 8970 if (D) 8971 // FIXME: What to pass instead of TUScope? 8972 ProcessDeclAttributes(TUScope, NewFD, *D); 8973 8974 // In auto-retain/release, infer strong retension for fields of 8975 // retainable type. 8976 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8977 NewFD->setInvalidDecl(); 8978 8979 if (T.isObjCGCWeak()) 8980 Diag(Loc, diag::warn_attribute_weak_on_field); 8981 8982 NewFD->setAccess(AS); 8983 return NewFD; 8984} 8985 8986bool Sema::CheckNontrivialField(FieldDecl *FD) { 8987 assert(FD); 8988 assert(getLangOpts().CPlusPlus && "valid check only for C++"); 8989 8990 if (FD->isInvalidDecl()) 8991 return true; 8992 8993 QualType EltTy = Context.getBaseElementType(FD->getType()); 8994 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8995 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8996 if (RDecl->getDefinition()) { 8997 // We check for copy constructors before constructors 8998 // because otherwise we'll never get complaints about 8999 // copy constructors. 9000 9001 CXXSpecialMember member = CXXInvalid; 9002 if (!RDecl->hasTrivialCopyConstructor()) 9003 member = CXXCopyConstructor; 9004 else if (!RDecl->hasTrivialDefaultConstructor()) 9005 member = CXXDefaultConstructor; 9006 else if (!RDecl->hasTrivialCopyAssignment()) 9007 member = CXXCopyAssignment; 9008 else if (!RDecl->hasTrivialDestructor()) 9009 member = CXXDestructor; 9010 9011 if (member != CXXInvalid) { 9012 if (!getLangOpts().CPlusPlus0x && 9013 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) { 9014 // Objective-C++ ARC: it is an error to have a non-trivial field of 9015 // a union. However, system headers in Objective-C programs 9016 // occasionally have Objective-C lifetime objects within unions, 9017 // and rather than cause the program to fail, we make those 9018 // members unavailable. 9019 SourceLocation Loc = FD->getLocation(); 9020 if (getSourceManager().isInSystemHeader(Loc)) { 9021 if (!FD->hasAttr<UnavailableAttr>()) 9022 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 9023 "this system field has retaining ownership")); 9024 return false; 9025 } 9026 } 9027 9028 Diag(FD->getLocation(), getLangOpts().CPlusPlus0x ? 9029 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 9030 diag::err_illegal_union_or_anon_struct_member) 9031 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 9032 DiagnoseNontrivial(RT, member); 9033 return !getLangOpts().CPlusPlus0x; 9034 } 9035 } 9036 } 9037 9038 return false; 9039} 9040 9041/// If the given constructor is user-provided, produce a diagnostic explaining 9042/// that it makes the class non-trivial. 9043static bool DiagnoseNontrivialUserProvidedCtor(Sema &S, QualType QT, 9044 CXXConstructorDecl *CD, 9045 Sema::CXXSpecialMember CSM) { 9046 if (!CD->isUserProvided()) 9047 return false; 9048 9049 SourceLocation CtorLoc = CD->getLocation(); 9050 S.Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << CSM; 9051 return true; 9052} 9053 9054/// DiagnoseNontrivial - Given that a class has a non-trivial 9055/// special member, figure out why. 9056void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 9057 QualType QT(T, 0U); 9058 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 9059 9060 // Check whether the member was user-declared. 9061 switch (member) { 9062 case CXXInvalid: 9063 break; 9064 9065 case CXXDefaultConstructor: 9066 if (RD->hasUserDeclaredConstructor()) { 9067 typedef CXXRecordDecl::ctor_iterator ctor_iter; 9068 for (ctor_iter CI = RD->ctor_begin(), CE = RD->ctor_end(); CI != CE; ++CI) 9069 if (DiagnoseNontrivialUserProvidedCtor(*this, QT, *CI, member)) 9070 return; 9071 9072 // No user-provided constructors; look for constructor templates. 9073 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 9074 tmpl_iter; 9075 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); 9076 TI != TE; ++TI) { 9077 CXXConstructorDecl *CD = 9078 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()); 9079 if (CD && DiagnoseNontrivialUserProvidedCtor(*this, QT, CD, member)) 9080 return; 9081 } 9082 } 9083 break; 9084 9085 case CXXCopyConstructor: 9086 if (RD->hasUserDeclaredCopyConstructor()) { 9087 SourceLocation CtorLoc = 9088 RD->getCopyConstructor(0)->getLocation(); 9089 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9090 return; 9091 } 9092 break; 9093 9094 case CXXMoveConstructor: 9095 if (RD->hasUserDeclaredMoveConstructor()) { 9096 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 9097 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9098 return; 9099 } 9100 break; 9101 9102 case CXXCopyAssignment: 9103 if (RD->hasUserDeclaredCopyAssignment()) { 9104 // FIXME: this should use the location of the copy 9105 // assignment, not the type. 9106 SourceLocation TyLoc = RD->getLocStart(); 9107 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 9108 return; 9109 } 9110 break; 9111 9112 case CXXMoveAssignment: 9113 if (RD->hasUserDeclaredMoveAssignment()) { 9114 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 9115 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9116 return; 9117 } 9118 break; 9119 9120 case CXXDestructor: 9121 if (RD->hasUserDeclaredDestructor()) { 9122 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 9123 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9124 return; 9125 } 9126 break; 9127 } 9128 9129 typedef CXXRecordDecl::base_class_iterator base_iter; 9130 9131 // Virtual bases and members inhibit trivial copying/construction, 9132 // but not trivial destruction. 9133 if (member != CXXDestructor) { 9134 // Check for virtual bases. vbases includes indirect virtual bases, 9135 // so we just iterate through the direct bases. 9136 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 9137 if (bi->isVirtual()) { 9138 SourceLocation BaseLoc = bi->getLocStart(); 9139 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 9140 return; 9141 } 9142 9143 // Check for virtual methods. 9144 typedef CXXRecordDecl::method_iterator meth_iter; 9145 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 9146 ++mi) { 9147 if (mi->isVirtual()) { 9148 SourceLocation MLoc = mi->getLocStart(); 9149 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 9150 return; 9151 } 9152 } 9153 } 9154 9155 bool (CXXRecordDecl::*hasTrivial)() const; 9156 switch (member) { 9157 case CXXDefaultConstructor: 9158 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 9159 case CXXCopyConstructor: 9160 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 9161 case CXXCopyAssignment: 9162 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 9163 case CXXDestructor: 9164 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 9165 default: 9166 llvm_unreachable("unexpected special member"); 9167 } 9168 9169 // Check for nontrivial bases (and recurse). 9170 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 9171 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 9172 assert(BaseRT && "Don't know how to handle dependent bases"); 9173 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 9174 if (!(BaseRecTy->*hasTrivial)()) { 9175 SourceLocation BaseLoc = bi->getLocStart(); 9176 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 9177 DiagnoseNontrivial(BaseRT, member); 9178 return; 9179 } 9180 } 9181 9182 // Check for nontrivial members (and recurse). 9183 typedef RecordDecl::field_iterator field_iter; 9184 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 9185 ++fi) { 9186 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 9187 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 9188 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 9189 9190 if (!(EltRD->*hasTrivial)()) { 9191 SourceLocation FLoc = (*fi)->getLocation(); 9192 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 9193 DiagnoseNontrivial(EltRT, member); 9194 return; 9195 } 9196 } 9197 9198 if (EltTy->isObjCLifetimeType()) { 9199 switch (EltTy.getObjCLifetime()) { 9200 case Qualifiers::OCL_None: 9201 case Qualifiers::OCL_ExplicitNone: 9202 break; 9203 9204 case Qualifiers::OCL_Autoreleasing: 9205 case Qualifiers::OCL_Weak: 9206 case Qualifiers::OCL_Strong: 9207 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 9208 << QT << EltTy.getObjCLifetime(); 9209 return; 9210 } 9211 } 9212 } 9213 9214 llvm_unreachable("found no explanation for non-trivial member"); 9215} 9216 9217/// TranslateIvarVisibility - Translate visibility from a token ID to an 9218/// AST enum value. 9219static ObjCIvarDecl::AccessControl 9220TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9221 switch (ivarVisibility) { 9222 default: llvm_unreachable("Unknown visitibility kind"); 9223 case tok::objc_private: return ObjCIvarDecl::Private; 9224 case tok::objc_public: return ObjCIvarDecl::Public; 9225 case tok::objc_protected: return ObjCIvarDecl::Protected; 9226 case tok::objc_package: return ObjCIvarDecl::Package; 9227 } 9228} 9229 9230/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9231/// in order to create an IvarDecl object for it. 9232Decl *Sema::ActOnIvar(Scope *S, 9233 SourceLocation DeclStart, 9234 Declarator &D, Expr *BitfieldWidth, 9235 tok::ObjCKeywordKind Visibility) { 9236 9237 IdentifierInfo *II = D.getIdentifier(); 9238 Expr *BitWidth = (Expr*)BitfieldWidth; 9239 SourceLocation Loc = DeclStart; 9240 if (II) Loc = D.getIdentifierLoc(); 9241 9242 // FIXME: Unnamed fields can be handled in various different ways, for 9243 // example, unnamed unions inject all members into the struct namespace! 9244 9245 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9246 QualType T = TInfo->getType(); 9247 9248 if (BitWidth) { 9249 // 6.7.2.1p3, 6.7.2.1p4 9250 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9251 if (!BitWidth) 9252 D.setInvalidType(); 9253 } else { 9254 // Not a bitfield. 9255 9256 // validate II. 9257 9258 } 9259 if (T->isReferenceType()) { 9260 Diag(Loc, diag::err_ivar_reference_type); 9261 D.setInvalidType(); 9262 } 9263 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9264 // than a variably modified type. 9265 else if (T->isVariablyModifiedType()) { 9266 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9267 D.setInvalidType(); 9268 } 9269 9270 // Get the visibility (access control) for this ivar. 9271 ObjCIvarDecl::AccessControl ac = 9272 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9273 : ObjCIvarDecl::None; 9274 // Must set ivar's DeclContext to its enclosing interface. 9275 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9276 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9277 return 0; 9278 ObjCContainerDecl *EnclosingContext; 9279 if (ObjCImplementationDecl *IMPDecl = 9280 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9281 if (!LangOpts.ObjCNonFragileABI2) { 9282 // Case of ivar declared in an implementation. Context is that of its class. 9283 EnclosingContext = IMPDecl->getClassInterface(); 9284 assert(EnclosingContext && "Implementation has no class interface!"); 9285 } 9286 else 9287 EnclosingContext = EnclosingDecl; 9288 } else { 9289 if (ObjCCategoryDecl *CDecl = 9290 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9291 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9292 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9293 return 0; 9294 } 9295 } 9296 EnclosingContext = EnclosingDecl; 9297 } 9298 9299 // Construct the decl. 9300 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9301 DeclStart, Loc, II, T, 9302 TInfo, ac, (Expr *)BitfieldWidth); 9303 9304 if (II) { 9305 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9306 ForRedeclaration); 9307 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9308 && !isa<TagDecl>(PrevDecl)) { 9309 Diag(Loc, diag::err_duplicate_member) << II; 9310 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9311 NewID->setInvalidDecl(); 9312 } 9313 } 9314 9315 // Process attributes attached to the ivar. 9316 ProcessDeclAttributes(S, NewID, D); 9317 9318 if (D.isInvalidType()) 9319 NewID->setInvalidDecl(); 9320 9321 // In ARC, infer 'retaining' for ivars of retainable type. 9322 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9323 NewID->setInvalidDecl(); 9324 9325 if (D.getDeclSpec().isModulePrivateSpecified()) 9326 NewID->setModulePrivate(); 9327 9328 if (II) { 9329 // FIXME: When interfaces are DeclContexts, we'll need to add 9330 // these to the interface. 9331 S->AddDecl(NewID); 9332 IdResolver.AddDecl(NewID); 9333 } 9334 9335 return NewID; 9336} 9337 9338/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9339/// class and class extensions. For every class @interface and class 9340/// extension @interface, if the last ivar is a bitfield of any type, 9341/// then add an implicit `char :0` ivar to the end of that interface. 9342void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9343 SmallVectorImpl<Decl *> &AllIvarDecls) { 9344 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9345 return; 9346 9347 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9348 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9349 9350 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9351 return; 9352 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9353 if (!ID) { 9354 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9355 if (!CD->IsClassExtension()) 9356 return; 9357 } 9358 // No need to add this to end of @implementation. 9359 else 9360 return; 9361 } 9362 // All conditions are met. Add a new bitfield to the tail end of ivars. 9363 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9364 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9365 9366 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9367 DeclLoc, DeclLoc, 0, 9368 Context.CharTy, 9369 Context.getTrivialTypeSourceInfo(Context.CharTy, 9370 DeclLoc), 9371 ObjCIvarDecl::Private, BW, 9372 true); 9373 AllIvarDecls.push_back(Ivar); 9374} 9375 9376void Sema::ActOnFields(Scope* S, 9377 SourceLocation RecLoc, Decl *EnclosingDecl, 9378 llvm::ArrayRef<Decl *> Fields, 9379 SourceLocation LBrac, SourceLocation RBrac, 9380 AttributeList *Attr) { 9381 assert(EnclosingDecl && "missing record or interface decl"); 9382 9383 // If the decl this is being inserted into is invalid, then it may be a 9384 // redeclaration or some other bogus case. Don't try to add fields to it. 9385 if (EnclosingDecl->isInvalidDecl()) 9386 return; 9387 9388 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9389 9390 // Start counting up the number of named members; make sure to include 9391 // members of anonymous structs and unions in the total. 9392 unsigned NumNamedMembers = 0; 9393 if (Record) { 9394 for (RecordDecl::decl_iterator i = Record->decls_begin(), 9395 e = Record->decls_end(); i != e; i++) { 9396 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i)) 9397 if (IFD->getDeclName()) 9398 ++NumNamedMembers; 9399 } 9400 } 9401 9402 // Verify that all the fields are okay. 9403 SmallVector<FieldDecl*, 32> RecFields; 9404 9405 bool ARCErrReported = false; 9406 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9407 i != end; ++i) { 9408 FieldDecl *FD = cast<FieldDecl>(*i); 9409 9410 // Get the type for the field. 9411 const Type *FDTy = FD->getType().getTypePtr(); 9412 9413 if (!FD->isAnonymousStructOrUnion()) { 9414 // Remember all fields written by the user. 9415 RecFields.push_back(FD); 9416 } 9417 9418 // If the field is already invalid for some reason, don't emit more 9419 // diagnostics about it. 9420 if (FD->isInvalidDecl()) { 9421 EnclosingDecl->setInvalidDecl(); 9422 continue; 9423 } 9424 9425 // C99 6.7.2.1p2: 9426 // A structure or union shall not contain a member with 9427 // incomplete or function type (hence, a structure shall not 9428 // contain an instance of itself, but may contain a pointer to 9429 // an instance of itself), except that the last member of a 9430 // structure with more than one named member may have incomplete 9431 // array type; such a structure (and any union containing, 9432 // possibly recursively, a member that is such a structure) 9433 // shall not be a member of a structure or an element of an 9434 // array. 9435 if (FDTy->isFunctionType()) { 9436 // Field declared as a function. 9437 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9438 << FD->getDeclName(); 9439 FD->setInvalidDecl(); 9440 EnclosingDecl->setInvalidDecl(); 9441 continue; 9442 } else if (FDTy->isIncompleteArrayType() && Record && 9443 ((i + 1 == Fields.end() && !Record->isUnion()) || 9444 ((getLangOpts().MicrosoftExt || 9445 getLangOpts().CPlusPlus) && 9446 (i + 1 == Fields.end() || Record->isUnion())))) { 9447 // Flexible array member. 9448 // Microsoft and g++ is more permissive regarding flexible array. 9449 // It will accept flexible array in union and also 9450 // as the sole element of a struct/class. 9451 if (getLangOpts().MicrosoftExt) { 9452 if (Record->isUnion()) 9453 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9454 << FD->getDeclName(); 9455 else if (Fields.size() == 1) 9456 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9457 << FD->getDeclName() << Record->getTagKind(); 9458 } else if (getLangOpts().CPlusPlus) { 9459 if (Record->isUnion()) 9460 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9461 << FD->getDeclName(); 9462 else if (Fields.size() == 1) 9463 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9464 << FD->getDeclName() << Record->getTagKind(); 9465 } else if (NumNamedMembers < 1) { 9466 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9467 << FD->getDeclName(); 9468 FD->setInvalidDecl(); 9469 EnclosingDecl->setInvalidDecl(); 9470 continue; 9471 } 9472 if (!FD->getType()->isDependentType() && 9473 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9474 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9475 << FD->getDeclName() << FD->getType(); 9476 FD->setInvalidDecl(); 9477 EnclosingDecl->setInvalidDecl(); 9478 continue; 9479 } 9480 // Okay, we have a legal flexible array member at the end of the struct. 9481 if (Record) 9482 Record->setHasFlexibleArrayMember(true); 9483 } else if (!FDTy->isDependentType() && 9484 RequireCompleteType(FD->getLocation(), FD->getType(), 9485 diag::err_field_incomplete)) { 9486 // Incomplete type 9487 FD->setInvalidDecl(); 9488 EnclosingDecl->setInvalidDecl(); 9489 continue; 9490 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9491 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9492 // If this is a member of a union, then entire union becomes "flexible". 9493 if (Record && Record->isUnion()) { 9494 Record->setHasFlexibleArrayMember(true); 9495 } else { 9496 // If this is a struct/class and this is not the last element, reject 9497 // it. Note that GCC supports variable sized arrays in the middle of 9498 // structures. 9499 if (i + 1 != Fields.end()) 9500 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9501 << FD->getDeclName() << FD->getType(); 9502 else { 9503 // We support flexible arrays at the end of structs in 9504 // other structs as an extension. 9505 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9506 << FD->getDeclName(); 9507 if (Record) 9508 Record->setHasFlexibleArrayMember(true); 9509 } 9510 } 9511 } 9512 if (Record && FDTTy->getDecl()->hasObjectMember()) 9513 Record->setHasObjectMember(true); 9514 } else if (FDTy->isObjCObjectType()) { 9515 /// A field cannot be an Objective-c object 9516 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9517 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9518 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9519 FD->setType(T); 9520 } 9521 else if (!getLangOpts().CPlusPlus) { 9522 if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported) { 9523 // It's an error in ARC if a field has lifetime. 9524 // We don't want to report this in a system header, though, 9525 // so we just make the field unavailable. 9526 // FIXME: that's really not sufficient; we need to make the type 9527 // itself invalid to, say, initialize or copy. 9528 QualType T = FD->getType(); 9529 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9530 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9531 SourceLocation loc = FD->getLocation(); 9532 if (getSourceManager().isInSystemHeader(loc)) { 9533 if (!FD->hasAttr<UnavailableAttr>()) { 9534 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9535 "this system field has retaining ownership")); 9536 } 9537 } else { 9538 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9539 << T->isBlockPointerType(); 9540 } 9541 ARCErrReported = true; 9542 } 9543 } 9544 else if (getLangOpts().ObjC1 && 9545 getLangOpts().getGC() != LangOptions::NonGC && 9546 Record && !Record->hasObjectMember()) { 9547 if (FD->getType()->isObjCObjectPointerType() || 9548 FD->getType().isObjCGCStrong()) 9549 Record->setHasObjectMember(true); 9550 else if (Context.getAsArrayType(FD->getType())) { 9551 QualType BaseType = Context.getBaseElementType(FD->getType()); 9552 if (BaseType->isRecordType() && 9553 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9554 Record->setHasObjectMember(true); 9555 else if (BaseType->isObjCObjectPointerType() || 9556 BaseType.isObjCGCStrong()) 9557 Record->setHasObjectMember(true); 9558 } 9559 } 9560 } 9561 // Keep track of the number of named members. 9562 if (FD->getIdentifier()) 9563 ++NumNamedMembers; 9564 } 9565 9566 // Okay, we successfully defined 'Record'. 9567 if (Record) { 9568 bool Completed = false; 9569 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9570 if (!CXXRecord->isInvalidDecl()) { 9571 // Set access bits correctly on the directly-declared conversions. 9572 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9573 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9574 I != E; ++I) 9575 Convs->setAccess(I, (*I)->getAccess()); 9576 9577 if (!CXXRecord->isDependentType()) { 9578 // Objective-C Automatic Reference Counting: 9579 // If a class has a non-static data member of Objective-C pointer 9580 // type (or array thereof), it is a non-POD type and its 9581 // default constructor (if any), copy constructor, copy assignment 9582 // operator, and destructor are non-trivial. 9583 // 9584 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9585 // However, here we check whether this particular class is only 9586 // non-POD because of the presence of an Objective-C pointer member. 9587 // If so, objects of this type cannot be shared between code compiled 9588 // with instant objects and code compiled with manual retain/release. 9589 if (getLangOpts().ObjCAutoRefCount && 9590 CXXRecord->hasObjectMember() && 9591 CXXRecord->getLinkage() == ExternalLinkage) { 9592 if (CXXRecord->isPOD()) { 9593 Diag(CXXRecord->getLocation(), 9594 diag::warn_arc_non_pod_class_with_object_member) 9595 << CXXRecord; 9596 } else { 9597 // FIXME: Fix-Its would be nice here, but finding a good location 9598 // for them is going to be tricky. 9599 if (CXXRecord->hasTrivialCopyConstructor()) 9600 Diag(CXXRecord->getLocation(), 9601 diag::warn_arc_trivial_member_function_with_object_member) 9602 << CXXRecord << 0; 9603 if (CXXRecord->hasTrivialCopyAssignment()) 9604 Diag(CXXRecord->getLocation(), 9605 diag::warn_arc_trivial_member_function_with_object_member) 9606 << CXXRecord << 1; 9607 if (CXXRecord->hasTrivialDestructor()) 9608 Diag(CXXRecord->getLocation(), 9609 diag::warn_arc_trivial_member_function_with_object_member) 9610 << CXXRecord << 2; 9611 } 9612 } 9613 9614 // Adjust user-defined destructor exception spec. 9615 if (getLangOpts().CPlusPlus0x && 9616 CXXRecord->hasUserDeclaredDestructor()) 9617 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9618 9619 // Add any implicitly-declared members to this class. 9620 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9621 9622 // If we have virtual base classes, we may end up finding multiple 9623 // final overriders for a given virtual function. Check for this 9624 // problem now. 9625 if (CXXRecord->getNumVBases()) { 9626 CXXFinalOverriderMap FinalOverriders; 9627 CXXRecord->getFinalOverriders(FinalOverriders); 9628 9629 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9630 MEnd = FinalOverriders.end(); 9631 M != MEnd; ++M) { 9632 for (OverridingMethods::iterator SO = M->second.begin(), 9633 SOEnd = M->second.end(); 9634 SO != SOEnd; ++SO) { 9635 assert(SO->second.size() > 0 && 9636 "Virtual function without overridding functions?"); 9637 if (SO->second.size() == 1) 9638 continue; 9639 9640 // C++ [class.virtual]p2: 9641 // In a derived class, if a virtual member function of a base 9642 // class subobject has more than one final overrider the 9643 // program is ill-formed. 9644 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9645 << (NamedDecl *)M->first << Record; 9646 Diag(M->first->getLocation(), 9647 diag::note_overridden_virtual_function); 9648 for (OverridingMethods::overriding_iterator 9649 OM = SO->second.begin(), 9650 OMEnd = SO->second.end(); 9651 OM != OMEnd; ++OM) 9652 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9653 << (NamedDecl *)M->first << OM->Method->getParent(); 9654 9655 Record->setInvalidDecl(); 9656 } 9657 } 9658 CXXRecord->completeDefinition(&FinalOverriders); 9659 Completed = true; 9660 } 9661 } 9662 } 9663 } 9664 9665 if (!Completed) 9666 Record->completeDefinition(); 9667 9668 // Now that the record is complete, do any delayed exception spec checks 9669 // we were missing. 9670 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9671 const CXXDestructorDecl *Dtor = 9672 DelayedDestructorExceptionSpecChecks.back().first; 9673 if (Dtor->getParent() != Record) 9674 break; 9675 9676 assert(!Dtor->getParent()->isDependentType() && 9677 "Should not ever add destructors of templates into the list."); 9678 CheckOverridingFunctionExceptionSpec(Dtor, 9679 DelayedDestructorExceptionSpecChecks.back().second); 9680 DelayedDestructorExceptionSpecChecks.pop_back(); 9681 } 9682 9683 } else { 9684 ObjCIvarDecl **ClsFields = 9685 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9686 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9687 ID->setEndOfDefinitionLoc(RBrac); 9688 // Add ivar's to class's DeclContext. 9689 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9690 ClsFields[i]->setLexicalDeclContext(ID); 9691 ID->addDecl(ClsFields[i]); 9692 } 9693 // Must enforce the rule that ivars in the base classes may not be 9694 // duplicates. 9695 if (ID->getSuperClass()) 9696 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9697 } else if (ObjCImplementationDecl *IMPDecl = 9698 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9699 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9700 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9701 // Ivar declared in @implementation never belongs to the implementation. 9702 // Only it is in implementation's lexical context. 9703 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9704 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9705 IMPDecl->setIvarLBraceLoc(LBrac); 9706 IMPDecl->setIvarRBraceLoc(RBrac); 9707 } else if (ObjCCategoryDecl *CDecl = 9708 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9709 // case of ivars in class extension; all other cases have been 9710 // reported as errors elsewhere. 9711 // FIXME. Class extension does not have a LocEnd field. 9712 // CDecl->setLocEnd(RBrac); 9713 // Add ivar's to class extension's DeclContext. 9714 // Diagnose redeclaration of private ivars. 9715 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9716 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9717 if (IDecl) { 9718 if (const ObjCIvarDecl *ClsIvar = 9719 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9720 Diag(ClsFields[i]->getLocation(), 9721 diag::err_duplicate_ivar_declaration); 9722 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9723 continue; 9724 } 9725 for (const ObjCCategoryDecl *ClsExtDecl = 9726 IDecl->getFirstClassExtension(); 9727 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9728 if (const ObjCIvarDecl *ClsExtIvar = 9729 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9730 Diag(ClsFields[i]->getLocation(), 9731 diag::err_duplicate_ivar_declaration); 9732 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9733 continue; 9734 } 9735 } 9736 } 9737 ClsFields[i]->setLexicalDeclContext(CDecl); 9738 CDecl->addDecl(ClsFields[i]); 9739 } 9740 CDecl->setIvarLBraceLoc(LBrac); 9741 CDecl->setIvarRBraceLoc(RBrac); 9742 } 9743 } 9744 9745 if (Attr) 9746 ProcessDeclAttributeList(S, Record, Attr); 9747 9748 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9749 // set the visibility of this record. 9750 if (Record && !Record->getDeclContext()->isRecord()) 9751 AddPushedVisibilityAttribute(Record); 9752} 9753 9754/// \brief Determine whether the given integral value is representable within 9755/// the given type T. 9756static bool isRepresentableIntegerValue(ASTContext &Context, 9757 llvm::APSInt &Value, 9758 QualType T) { 9759 assert(T->isIntegralType(Context) && "Integral type required!"); 9760 unsigned BitWidth = Context.getIntWidth(T); 9761 9762 if (Value.isUnsigned() || Value.isNonNegative()) { 9763 if (T->isSignedIntegerOrEnumerationType()) 9764 --BitWidth; 9765 return Value.getActiveBits() <= BitWidth; 9766 } 9767 return Value.getMinSignedBits() <= BitWidth; 9768} 9769 9770// \brief Given an integral type, return the next larger integral type 9771// (or a NULL type of no such type exists). 9772static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9773 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9774 // enum checking below. 9775 assert(T->isIntegralType(Context) && "Integral type required!"); 9776 const unsigned NumTypes = 4; 9777 QualType SignedIntegralTypes[NumTypes] = { 9778 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9779 }; 9780 QualType UnsignedIntegralTypes[NumTypes] = { 9781 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9782 Context.UnsignedLongLongTy 9783 }; 9784 9785 unsigned BitWidth = Context.getTypeSize(T); 9786 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9787 : UnsignedIntegralTypes; 9788 for (unsigned I = 0; I != NumTypes; ++I) 9789 if (Context.getTypeSize(Types[I]) > BitWidth) 9790 return Types[I]; 9791 9792 return QualType(); 9793} 9794 9795EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9796 EnumConstantDecl *LastEnumConst, 9797 SourceLocation IdLoc, 9798 IdentifierInfo *Id, 9799 Expr *Val) { 9800 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9801 llvm::APSInt EnumVal(IntWidth); 9802 QualType EltTy; 9803 9804 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9805 Val = 0; 9806 9807 if (Val) 9808 Val = DefaultLvalueConversion(Val).take(); 9809 9810 if (Val) { 9811 if (Enum->isDependentType() || Val->isTypeDependent()) 9812 EltTy = Context.DependentTy; 9813 else { 9814 SourceLocation ExpLoc; 9815 if (getLangOpts().CPlusPlus0x && Enum->isFixed() && 9816 !getLangOpts().MicrosoftMode) { 9817 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 9818 // constant-expression in the enumerator-definition shall be a converted 9819 // constant expression of the underlying type. 9820 EltTy = Enum->getIntegerType(); 9821 ExprResult Converted = 9822 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 9823 CCEK_Enumerator); 9824 if (Converted.isInvalid()) 9825 Val = 0; 9826 else 9827 Val = Converted.take(); 9828 } else if (!Val->isValueDependent() && 9829 !(Val = VerifyIntegerConstantExpression(Val, 9830 &EnumVal).take())) { 9831 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9832 } else { 9833 if (Enum->isFixed()) { 9834 EltTy = Enum->getIntegerType(); 9835 9836 // In Obj-C and Microsoft mode, require the enumeration value to be 9837 // representable in the underlying type of the enumeration. In C++11, 9838 // we perform a non-narrowing conversion as part of converted constant 9839 // expression checking. 9840 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9841 if (getLangOpts().MicrosoftMode) { 9842 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9843 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9844 } else 9845 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 9846 } else 9847 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9848 } else if (getLangOpts().CPlusPlus) { 9849 // C++11 [dcl.enum]p5: 9850 // If the underlying type is not fixed, the type of each enumerator 9851 // is the type of its initializing value: 9852 // - If an initializer is specified for an enumerator, the 9853 // initializing value has the same type as the expression. 9854 EltTy = Val->getType(); 9855 } else { 9856 // C99 6.7.2.2p2: 9857 // The expression that defines the value of an enumeration constant 9858 // shall be an integer constant expression that has a value 9859 // representable as an int. 9860 9861 // Complain if the value is not representable in an int. 9862 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9863 Diag(IdLoc, diag::ext_enum_value_not_int) 9864 << EnumVal.toString(10) << Val->getSourceRange() 9865 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9866 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9867 // Force the type of the expression to 'int'. 9868 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9869 } 9870 EltTy = Val->getType(); 9871 } 9872 } 9873 } 9874 } 9875 9876 if (!Val) { 9877 if (Enum->isDependentType()) 9878 EltTy = Context.DependentTy; 9879 else if (!LastEnumConst) { 9880 // C++0x [dcl.enum]p5: 9881 // If the underlying type is not fixed, the type of each enumerator 9882 // is the type of its initializing value: 9883 // - If no initializer is specified for the first enumerator, the 9884 // initializing value has an unspecified integral type. 9885 // 9886 // GCC uses 'int' for its unspecified integral type, as does 9887 // C99 6.7.2.2p3. 9888 if (Enum->isFixed()) { 9889 EltTy = Enum->getIntegerType(); 9890 } 9891 else { 9892 EltTy = Context.IntTy; 9893 } 9894 } else { 9895 // Assign the last value + 1. 9896 EnumVal = LastEnumConst->getInitVal(); 9897 ++EnumVal; 9898 EltTy = LastEnumConst->getType(); 9899 9900 // Check for overflow on increment. 9901 if (EnumVal < LastEnumConst->getInitVal()) { 9902 // C++0x [dcl.enum]p5: 9903 // If the underlying type is not fixed, the type of each enumerator 9904 // is the type of its initializing value: 9905 // 9906 // - Otherwise the type of the initializing value is the same as 9907 // the type of the initializing value of the preceding enumerator 9908 // unless the incremented value is not representable in that type, 9909 // in which case the type is an unspecified integral type 9910 // sufficient to contain the incremented value. If no such type 9911 // exists, the program is ill-formed. 9912 QualType T = getNextLargerIntegralType(Context, EltTy); 9913 if (T.isNull() || Enum->isFixed()) { 9914 // There is no integral type larger enough to represent this 9915 // value. Complain, then allow the value to wrap around. 9916 EnumVal = LastEnumConst->getInitVal(); 9917 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9918 ++EnumVal; 9919 if (Enum->isFixed()) 9920 // When the underlying type is fixed, this is ill-formed. 9921 Diag(IdLoc, diag::err_enumerator_wrapped) 9922 << EnumVal.toString(10) 9923 << EltTy; 9924 else 9925 Diag(IdLoc, diag::warn_enumerator_too_large) 9926 << EnumVal.toString(10); 9927 } else { 9928 EltTy = T; 9929 } 9930 9931 // Retrieve the last enumerator's value, extent that type to the 9932 // type that is supposed to be large enough to represent the incremented 9933 // value, then increment. 9934 EnumVal = LastEnumConst->getInitVal(); 9935 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9936 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9937 ++EnumVal; 9938 9939 // If we're not in C++, diagnose the overflow of enumerator values, 9940 // which in C99 means that the enumerator value is not representable in 9941 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9942 // permits enumerator values that are representable in some larger 9943 // integral type. 9944 if (!getLangOpts().CPlusPlus && !T.isNull()) 9945 Diag(IdLoc, diag::warn_enum_value_overflow); 9946 } else if (!getLangOpts().CPlusPlus && 9947 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9948 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9949 Diag(IdLoc, diag::ext_enum_value_not_int) 9950 << EnumVal.toString(10) << 1; 9951 } 9952 } 9953 } 9954 9955 if (!EltTy->isDependentType()) { 9956 // Make the enumerator value match the signedness and size of the 9957 // enumerator's type. 9958 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); 9959 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9960 } 9961 9962 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9963 Val, EnumVal); 9964} 9965 9966 9967Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9968 SourceLocation IdLoc, IdentifierInfo *Id, 9969 AttributeList *Attr, 9970 SourceLocation EqualLoc, Expr *Val) { 9971 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9972 EnumConstantDecl *LastEnumConst = 9973 cast_or_null<EnumConstantDecl>(lastEnumConst); 9974 9975 // The scope passed in may not be a decl scope. Zip up the scope tree until 9976 // we find one that is. 9977 S = getNonFieldDeclScope(S); 9978 9979 // Verify that there isn't already something declared with this name in this 9980 // scope. 9981 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9982 ForRedeclaration); 9983 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9984 // Maybe we will complain about the shadowed template parameter. 9985 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9986 // Just pretend that we didn't see the previous declaration. 9987 PrevDecl = 0; 9988 } 9989 9990 if (PrevDecl) { 9991 // When in C++, we may get a TagDecl with the same name; in this case the 9992 // enum constant will 'hide' the tag. 9993 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9994 "Received TagDecl when not in C++!"); 9995 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9996 if (isa<EnumConstantDecl>(PrevDecl)) 9997 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9998 else 9999 Diag(IdLoc, diag::err_redefinition) << Id; 10000 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 10001 return 0; 10002 } 10003 } 10004 10005 // C++ [class.mem]p13: 10006 // If T is the name of a class, then each of the following shall have a 10007 // name different from T: 10008 // - every enumerator of every member of class T that is an enumerated 10009 // type 10010 if (CXXRecordDecl *Record 10011 = dyn_cast<CXXRecordDecl>( 10012 TheEnumDecl->getDeclContext()->getRedeclContext())) 10013 if (Record->getIdentifier() && Record->getIdentifier() == Id) 10014 Diag(IdLoc, diag::err_member_name_of_class) << Id; 10015 10016 EnumConstantDecl *New = 10017 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 10018 10019 if (New) { 10020 // Process attributes. 10021 if (Attr) ProcessDeclAttributeList(S, New, Attr); 10022 10023 // Register this decl in the current scope stack. 10024 New->setAccess(TheEnumDecl->getAccess()); 10025 PushOnScopeChains(New, S); 10026 } 10027 10028 return New; 10029} 10030 10031void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 10032 SourceLocation RBraceLoc, Decl *EnumDeclX, 10033 Decl **Elements, unsigned NumElements, 10034 Scope *S, AttributeList *Attr) { 10035 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 10036 QualType EnumType = Context.getTypeDeclType(Enum); 10037 10038 if (Attr) 10039 ProcessDeclAttributeList(S, Enum, Attr); 10040 10041 if (Enum->isDependentType()) { 10042 for (unsigned i = 0; i != NumElements; ++i) { 10043 EnumConstantDecl *ECD = 10044 cast_or_null<EnumConstantDecl>(Elements[i]); 10045 if (!ECD) continue; 10046 10047 ECD->setType(EnumType); 10048 } 10049 10050 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 10051 return; 10052 } 10053 10054 // TODO: If the result value doesn't fit in an int, it must be a long or long 10055 // long value. ISO C does not support this, but GCC does as an extension, 10056 // emit a warning. 10057 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10058 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 10059 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 10060 10061 // Verify that all the values are okay, compute the size of the values, and 10062 // reverse the list. 10063 unsigned NumNegativeBits = 0; 10064 unsigned NumPositiveBits = 0; 10065 10066 // Keep track of whether all elements have type int. 10067 bool AllElementsInt = true; 10068 10069 for (unsigned i = 0; i != NumElements; ++i) { 10070 EnumConstantDecl *ECD = 10071 cast_or_null<EnumConstantDecl>(Elements[i]); 10072 if (!ECD) continue; // Already issued a diagnostic. 10073 10074 const llvm::APSInt &InitVal = ECD->getInitVal(); 10075 10076 // Keep track of the size of positive and negative values. 10077 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 10078 NumPositiveBits = std::max(NumPositiveBits, 10079 (unsigned)InitVal.getActiveBits()); 10080 else 10081 NumNegativeBits = std::max(NumNegativeBits, 10082 (unsigned)InitVal.getMinSignedBits()); 10083 10084 // Keep track of whether every enum element has type int (very commmon). 10085 if (AllElementsInt) 10086 AllElementsInt = ECD->getType() == Context.IntTy; 10087 } 10088 10089 // Figure out the type that should be used for this enum. 10090 QualType BestType; 10091 unsigned BestWidth; 10092 10093 // C++0x N3000 [conv.prom]p3: 10094 // An rvalue of an unscoped enumeration type whose underlying 10095 // type is not fixed can be converted to an rvalue of the first 10096 // of the following types that can represent all the values of 10097 // the enumeration: int, unsigned int, long int, unsigned long 10098 // int, long long int, or unsigned long long int. 10099 // C99 6.4.4.3p2: 10100 // An identifier declared as an enumeration constant has type int. 10101 // The C99 rule is modified by a gcc extension 10102 QualType BestPromotionType; 10103 10104 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 10105 // -fshort-enums is the equivalent to specifying the packed attribute on all 10106 // enum definitions. 10107 if (LangOpts.ShortEnums) 10108 Packed = true; 10109 10110 if (Enum->isFixed()) { 10111 BestType = Enum->getIntegerType(); 10112 if (BestType->isPromotableIntegerType()) 10113 BestPromotionType = Context.getPromotedIntegerType(BestType); 10114 else 10115 BestPromotionType = BestType; 10116 // We don't need to set BestWidth, because BestType is going to be the type 10117 // of the enumerators, but we do anyway because otherwise some compilers 10118 // warn that it might be used uninitialized. 10119 BestWidth = CharWidth; 10120 } 10121 else if (NumNegativeBits) { 10122 // If there is a negative value, figure out the smallest integer type (of 10123 // int/long/longlong) that fits. 10124 // If it's packed, check also if it fits a char or a short. 10125 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 10126 BestType = Context.SignedCharTy; 10127 BestWidth = CharWidth; 10128 } else if (Packed && NumNegativeBits <= ShortWidth && 10129 NumPositiveBits < ShortWidth) { 10130 BestType = Context.ShortTy; 10131 BestWidth = ShortWidth; 10132 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 10133 BestType = Context.IntTy; 10134 BestWidth = IntWidth; 10135 } else { 10136 BestWidth = Context.getTargetInfo().getLongWidth(); 10137 10138 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 10139 BestType = Context.LongTy; 10140 } else { 10141 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10142 10143 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 10144 Diag(Enum->getLocation(), diag::warn_enum_too_large); 10145 BestType = Context.LongLongTy; 10146 } 10147 } 10148 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 10149 } else { 10150 // If there is no negative value, figure out the smallest type that fits 10151 // all of the enumerator values. 10152 // If it's packed, check also if it fits a char or a short. 10153 if (Packed && NumPositiveBits <= CharWidth) { 10154 BestType = Context.UnsignedCharTy; 10155 BestPromotionType = Context.IntTy; 10156 BestWidth = CharWidth; 10157 } else if (Packed && NumPositiveBits <= ShortWidth) { 10158 BestType = Context.UnsignedShortTy; 10159 BestPromotionType = Context.IntTy; 10160 BestWidth = ShortWidth; 10161 } else if (NumPositiveBits <= IntWidth) { 10162 BestType = Context.UnsignedIntTy; 10163 BestWidth = IntWidth; 10164 BestPromotionType 10165 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10166 ? Context.UnsignedIntTy : Context.IntTy; 10167 } else if (NumPositiveBits <= 10168 (BestWidth = Context.getTargetInfo().getLongWidth())) { 10169 BestType = Context.UnsignedLongTy; 10170 BestPromotionType 10171 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10172 ? Context.UnsignedLongTy : Context.LongTy; 10173 } else { 10174 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10175 assert(NumPositiveBits <= BestWidth && 10176 "How could an initializer get larger than ULL?"); 10177 BestType = Context.UnsignedLongLongTy; 10178 BestPromotionType 10179 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10180 ? Context.UnsignedLongLongTy : Context.LongLongTy; 10181 } 10182 } 10183 10184 // Loop over all of the enumerator constants, changing their types to match 10185 // the type of the enum if needed. 10186 for (unsigned i = 0; i != NumElements; ++i) { 10187 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10188 if (!ECD) continue; // Already issued a diagnostic. 10189 10190 // Standard C says the enumerators have int type, but we allow, as an 10191 // extension, the enumerators to be larger than int size. If each 10192 // enumerator value fits in an int, type it as an int, otherwise type it the 10193 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 10194 // that X has type 'int', not 'unsigned'. 10195 10196 // Determine whether the value fits into an int. 10197 llvm::APSInt InitVal = ECD->getInitVal(); 10198 10199 // If it fits into an integer type, force it. Otherwise force it to match 10200 // the enum decl type. 10201 QualType NewTy; 10202 unsigned NewWidth; 10203 bool NewSign; 10204 if (!getLangOpts().CPlusPlus && 10205 !Enum->isFixed() && 10206 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 10207 NewTy = Context.IntTy; 10208 NewWidth = IntWidth; 10209 NewSign = true; 10210 } else if (ECD->getType() == BestType) { 10211 // Already the right type! 10212 if (getLangOpts().CPlusPlus) 10213 // C++ [dcl.enum]p4: Following the closing brace of an 10214 // enum-specifier, each enumerator has the type of its 10215 // enumeration. 10216 ECD->setType(EnumType); 10217 continue; 10218 } else { 10219 NewTy = BestType; 10220 NewWidth = BestWidth; 10221 NewSign = BestType->isSignedIntegerOrEnumerationType(); 10222 } 10223 10224 // Adjust the APSInt value. 10225 InitVal = InitVal.extOrTrunc(NewWidth); 10226 InitVal.setIsSigned(NewSign); 10227 ECD->setInitVal(InitVal); 10228 10229 // Adjust the Expr initializer and type. 10230 if (ECD->getInitExpr() && 10231 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10232 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10233 CK_IntegralCast, 10234 ECD->getInitExpr(), 10235 /*base paths*/ 0, 10236 VK_RValue)); 10237 if (getLangOpts().CPlusPlus) 10238 // C++ [dcl.enum]p4: Following the closing brace of an 10239 // enum-specifier, each enumerator has the type of its 10240 // enumeration. 10241 ECD->setType(EnumType); 10242 else 10243 ECD->setType(NewTy); 10244 } 10245 10246 Enum->completeDefinition(BestType, BestPromotionType, 10247 NumPositiveBits, NumNegativeBits); 10248 10249 // If we're declaring a function, ensure this decl isn't forgotten about - 10250 // it needs to go into the function scope. 10251 if (InFunctionDeclarator) 10252 DeclsInPrototypeScope.push_back(Enum); 10253 10254} 10255 10256Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10257 SourceLocation StartLoc, 10258 SourceLocation EndLoc) { 10259 StringLiteral *AsmString = cast<StringLiteral>(expr); 10260 10261 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10262 AsmString, StartLoc, 10263 EndLoc); 10264 CurContext->addDecl(New); 10265 return New; 10266} 10267 10268DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10269 SourceLocation ImportLoc, 10270 ModuleIdPath Path) { 10271 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10272 Module::AllVisible, 10273 /*IsIncludeDirective=*/false); 10274 if (!Mod) 10275 return true; 10276 10277 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10278 Module *ModCheck = Mod; 10279 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10280 // If we've run out of module parents, just drop the remaining identifiers. 10281 // We need the length to be consistent. 10282 if (!ModCheck) 10283 break; 10284 ModCheck = ModCheck->Parent; 10285 10286 IdentifierLocs.push_back(Path[I].second); 10287 } 10288 10289 ImportDecl *Import = ImportDecl::Create(Context, 10290 Context.getTranslationUnitDecl(), 10291 AtLoc.isValid()? AtLoc : ImportLoc, 10292 Mod, IdentifierLocs); 10293 Context.getTranslationUnitDecl()->addDecl(Import); 10294 return Import; 10295} 10296 10297void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name, 10298 IdentifierInfo* AliasName, 10299 SourceLocation PragmaLoc, 10300 SourceLocation NameLoc, 10301 SourceLocation AliasNameLoc) { 10302 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, 10303 LookupOrdinaryName); 10304 AsmLabelAttr *Attr = 10305 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName()); 10306 10307 if (PrevDecl) 10308 PrevDecl->addAttr(Attr); 10309 else 10310 (void)ExtnameUndeclaredIdentifiers.insert( 10311 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr)); 10312} 10313 10314void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10315 SourceLocation PragmaLoc, 10316 SourceLocation NameLoc) { 10317 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10318 10319 if (PrevDecl) { 10320 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10321 } else { 10322 (void)WeakUndeclaredIdentifiers.insert( 10323 std::pair<IdentifierInfo*,WeakInfo> 10324 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10325 } 10326} 10327 10328void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10329 IdentifierInfo* AliasName, 10330 SourceLocation PragmaLoc, 10331 SourceLocation NameLoc, 10332 SourceLocation AliasNameLoc) { 10333 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10334 LookupOrdinaryName); 10335 WeakInfo W = WeakInfo(Name, NameLoc); 10336 10337 if (PrevDecl) { 10338 if (!PrevDecl->hasAttr<AliasAttr>()) 10339 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10340 DeclApplyPragmaWeak(TUScope, ND, W); 10341 } else { 10342 (void)WeakUndeclaredIdentifiers.insert( 10343 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10344 } 10345} 10346 10347Decl *Sema::getObjCDeclContext() const { 10348 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10349} 10350 10351AvailabilityResult Sema::getCurContextAvailability() const { 10352 const Decl *D = cast<Decl>(getCurLexicalContext()); 10353 // A category implicitly has the availability of the interface. 10354 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10355 D = CatD->getClassInterface(); 10356 10357 return D->getAvailability(); 10358} 10359