SemaDecl.cpp revision bf359c9683fd56260d6860c7d1a8abc26a190a2b
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 !(getLangOptions().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(getLangOptions())); 203 std::string CorrectedQuotedStr( 204 Correction.getQuoted(getLangOptions())); 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(getLangOptions())); 377 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 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 (getLangOptions().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 (getLangOptions().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().getLangOptions().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 (getLangOptions().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 (!getLangOptions().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 << getLangOptions().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(getLangOptions())); 584 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 585 586 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 587 NamedDecl *UnderlyingFirstDecl 588 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 589 if (getLangOptions().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 (getLangOptions().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 (getLangOptions().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.getLangOptions().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 ((getLangOptions().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.getLangOptions(), 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 = true; 1254} 1255 1256/// \brief Look for an Objective-C class in the translation unit. 1257/// 1258/// \param Id The name of the Objective-C class we're looking for. If 1259/// typo-correction fixes this name, the Id will be updated 1260/// to the fixed name. 1261/// 1262/// \param IdLoc The location of the name in the translation unit. 1263/// 1264/// \param TypoCorrection If true, this routine will attempt typo correction 1265/// if there is no class with the given name. 1266/// 1267/// \returns The declaration of the named Objective-C class, or NULL if the 1268/// class could not be found. 1269ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1270 SourceLocation IdLoc, 1271 bool DoTypoCorrection) { 1272 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1273 // creation from this context. 1274 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1275 1276 if (!IDecl && DoTypoCorrection) { 1277 // Perform typo correction at the given location, but only if we 1278 // find an Objective-C class name. 1279 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1280 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1281 LookupOrdinaryName, TUScope, NULL, 1282 Validator)) { 1283 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1284 Diag(IdLoc, diag::err_undef_interface_suggest) 1285 << Id << IDecl->getDeclName() 1286 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1287 Diag(IDecl->getLocation(), diag::note_previous_decl) 1288 << IDecl->getDeclName(); 1289 1290 Id = IDecl->getIdentifier(); 1291 } 1292 } 1293 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1294 // This routine must always return a class definition, if any. 1295 if (Def && Def->getDefinition()) 1296 Def = Def->getDefinition(); 1297 return Def; 1298} 1299 1300/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1301/// from S, where a non-field would be declared. This routine copes 1302/// with the difference between C and C++ scoping rules in structs and 1303/// unions. For example, the following code is well-formed in C but 1304/// ill-formed in C++: 1305/// @code 1306/// struct S6 { 1307/// enum { BAR } e; 1308/// }; 1309/// 1310/// void test_S6() { 1311/// struct S6 a; 1312/// a.e = BAR; 1313/// } 1314/// @endcode 1315/// For the declaration of BAR, this routine will return a different 1316/// scope. The scope S will be the scope of the unnamed enumeration 1317/// within S6. In C++, this routine will return the scope associated 1318/// with S6, because the enumeration's scope is a transparent 1319/// context but structures can contain non-field names. In C, this 1320/// routine will return the translation unit scope, since the 1321/// enumeration's scope is a transparent context and structures cannot 1322/// contain non-field names. 1323Scope *Sema::getNonFieldDeclScope(Scope *S) { 1324 while (((S->getFlags() & Scope::DeclScope) == 0) || 1325 (S->getEntity() && 1326 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1327 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1328 S = S->getParent(); 1329 return S; 1330} 1331 1332/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1333/// file scope. lazily create a decl for it. ForRedeclaration is true 1334/// if we're creating this built-in in anticipation of redeclaring the 1335/// built-in. 1336NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1337 Scope *S, bool ForRedeclaration, 1338 SourceLocation Loc) { 1339 Builtin::ID BID = (Builtin::ID)bid; 1340 1341 ASTContext::GetBuiltinTypeError Error; 1342 QualType R = Context.GetBuiltinType(BID, Error); 1343 switch (Error) { 1344 case ASTContext::GE_None: 1345 // Okay 1346 break; 1347 1348 case ASTContext::GE_Missing_stdio: 1349 if (ForRedeclaration) 1350 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1351 << Context.BuiltinInfo.GetName(BID); 1352 return 0; 1353 1354 case ASTContext::GE_Missing_setjmp: 1355 if (ForRedeclaration) 1356 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1357 << Context.BuiltinInfo.GetName(BID); 1358 return 0; 1359 1360 case ASTContext::GE_Missing_ucontext: 1361 if (ForRedeclaration) 1362 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1363 << Context.BuiltinInfo.GetName(BID); 1364 return 0; 1365 } 1366 1367 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1368 Diag(Loc, diag::ext_implicit_lib_function_decl) 1369 << Context.BuiltinInfo.GetName(BID) 1370 << R; 1371 if (Context.BuiltinInfo.getHeaderName(BID) && 1372 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1373 != DiagnosticsEngine::Ignored) 1374 Diag(Loc, diag::note_please_include_header) 1375 << Context.BuiltinInfo.getHeaderName(BID) 1376 << Context.BuiltinInfo.GetName(BID); 1377 } 1378 1379 FunctionDecl *New = FunctionDecl::Create(Context, 1380 Context.getTranslationUnitDecl(), 1381 Loc, Loc, II, R, /*TInfo=*/0, 1382 SC_Extern, 1383 SC_None, false, 1384 /*hasPrototype=*/true); 1385 New->setImplicit(); 1386 1387 // Create Decl objects for each parameter, adding them to the 1388 // FunctionDecl. 1389 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1390 SmallVector<ParmVarDecl*, 16> Params; 1391 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1392 ParmVarDecl *parm = 1393 ParmVarDecl::Create(Context, New, SourceLocation(), 1394 SourceLocation(), 0, 1395 FT->getArgType(i), /*TInfo=*/0, 1396 SC_None, SC_None, 0); 1397 parm->setScopeInfo(0, i); 1398 Params.push_back(parm); 1399 } 1400 New->setParams(Params); 1401 } 1402 1403 AddKnownFunctionAttributes(New); 1404 1405 // TUScope is the translation-unit scope to insert this function into. 1406 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1407 // relate Scopes to DeclContexts, and probably eliminate CurContext 1408 // entirely, but we're not there yet. 1409 DeclContext *SavedContext = CurContext; 1410 CurContext = Context.getTranslationUnitDecl(); 1411 PushOnScopeChains(New, TUScope); 1412 CurContext = SavedContext; 1413 return New; 1414} 1415 1416bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1417 QualType OldType; 1418 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1419 OldType = OldTypedef->getUnderlyingType(); 1420 else 1421 OldType = Context.getTypeDeclType(Old); 1422 QualType NewType = New->getUnderlyingType(); 1423 1424 if (NewType->isVariablyModifiedType()) { 1425 // Must not redefine a typedef with a variably-modified type. 1426 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1427 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1428 << Kind << NewType; 1429 if (Old->getLocation().isValid()) 1430 Diag(Old->getLocation(), diag::note_previous_definition); 1431 New->setInvalidDecl(); 1432 return true; 1433 } 1434 1435 if (OldType != NewType && 1436 !OldType->isDependentType() && 1437 !NewType->isDependentType() && 1438 !Context.hasSameType(OldType, NewType)) { 1439 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1440 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1441 << Kind << NewType << OldType; 1442 if (Old->getLocation().isValid()) 1443 Diag(Old->getLocation(), diag::note_previous_definition); 1444 New->setInvalidDecl(); 1445 return true; 1446 } 1447 return false; 1448} 1449 1450/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1451/// same name and scope as a previous declaration 'Old'. Figure out 1452/// how to resolve this situation, merging decls or emitting 1453/// diagnostics as appropriate. If there was an error, set New to be invalid. 1454/// 1455void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1456 // If the new decl is known invalid already, don't bother doing any 1457 // merging checks. 1458 if (New->isInvalidDecl()) return; 1459 1460 // Allow multiple definitions for ObjC built-in typedefs. 1461 // FIXME: Verify the underlying types are equivalent! 1462 if (getLangOptions().ObjC1) { 1463 const IdentifierInfo *TypeID = New->getIdentifier(); 1464 switch (TypeID->getLength()) { 1465 default: break; 1466 case 2: 1467 if (!TypeID->isStr("id")) 1468 break; 1469 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1470 // Install the built-in type for 'id', ignoring the current definition. 1471 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1472 return; 1473 case 5: 1474 if (!TypeID->isStr("Class")) 1475 break; 1476 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1477 // Install the built-in type for 'Class', ignoring the current definition. 1478 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1479 return; 1480 case 3: 1481 if (!TypeID->isStr("SEL")) 1482 break; 1483 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1484 // Install the built-in type for 'SEL', ignoring the current definition. 1485 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1486 return; 1487 } 1488 // Fall through - the typedef name was not a builtin type. 1489 } 1490 1491 // Verify the old decl was also a type. 1492 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1493 if (!Old) { 1494 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1495 << New->getDeclName(); 1496 1497 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1498 if (OldD->getLocation().isValid()) 1499 Diag(OldD->getLocation(), diag::note_previous_definition); 1500 1501 return New->setInvalidDecl(); 1502 } 1503 1504 // If the old declaration is invalid, just give up here. 1505 if (Old->isInvalidDecl()) 1506 return New->setInvalidDecl(); 1507 1508 // If the typedef types are not identical, reject them in all languages and 1509 // with any extensions enabled. 1510 if (isIncompatibleTypedef(Old, New)) 1511 return; 1512 1513 // The types match. Link up the redeclaration chain if the old 1514 // declaration was a typedef. 1515 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1516 New->setPreviousDeclaration(Typedef); 1517 1518 if (getLangOptions().MicrosoftExt) 1519 return; 1520 1521 if (getLangOptions().CPlusPlus) { 1522 // C++ [dcl.typedef]p2: 1523 // In a given non-class scope, a typedef specifier can be used to 1524 // redefine the name of any type declared in that scope to refer 1525 // to the type to which it already refers. 1526 if (!isa<CXXRecordDecl>(CurContext)) 1527 return; 1528 1529 // C++0x [dcl.typedef]p4: 1530 // In a given class scope, a typedef specifier can be used to redefine 1531 // any class-name declared in that scope that is not also a typedef-name 1532 // to refer to the type to which it already refers. 1533 // 1534 // This wording came in via DR424, which was a correction to the 1535 // wording in DR56, which accidentally banned code like: 1536 // 1537 // struct S { 1538 // typedef struct A { } A; 1539 // }; 1540 // 1541 // in the C++03 standard. We implement the C++0x semantics, which 1542 // allow the above but disallow 1543 // 1544 // struct S { 1545 // typedef int I; 1546 // typedef int I; 1547 // }; 1548 // 1549 // since that was the intent of DR56. 1550 if (!isa<TypedefNameDecl>(Old)) 1551 return; 1552 1553 Diag(New->getLocation(), diag::err_redefinition) 1554 << New->getDeclName(); 1555 Diag(Old->getLocation(), diag::note_previous_definition); 1556 return New->setInvalidDecl(); 1557 } 1558 1559 // Modules always permit redefinition of typedefs, as does C11. 1560 if (getLangOptions().Modules || getLangOptions().C11) 1561 return; 1562 1563 // If we have a redefinition of a typedef in C, emit a warning. This warning 1564 // is normally mapped to an error, but can be controlled with 1565 // -Wtypedef-redefinition. If either the original or the redefinition is 1566 // in a system header, don't emit this for compatibility with GCC. 1567 if (getDiagnostics().getSuppressSystemWarnings() && 1568 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1569 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1570 return; 1571 1572 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1573 << New->getDeclName(); 1574 Diag(Old->getLocation(), diag::note_previous_definition); 1575 return; 1576} 1577 1578/// DeclhasAttr - returns true if decl Declaration already has the target 1579/// attribute. 1580static bool 1581DeclHasAttr(const Decl *D, const Attr *A) { 1582 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1583 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1584 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1585 if ((*i)->getKind() == A->getKind()) { 1586 if (Ann) { 1587 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1588 return true; 1589 continue; 1590 } 1591 // FIXME: Don't hardcode this check 1592 if (OA && isa<OwnershipAttr>(*i)) 1593 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1594 return true; 1595 } 1596 1597 return false; 1598} 1599 1600/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1601void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1602 bool MergeDeprecation) { 1603 if (!Old->hasAttrs()) 1604 return; 1605 1606 bool foundAny = New->hasAttrs(); 1607 1608 // Ensure that any moving of objects within the allocated map is done before 1609 // we process them. 1610 if (!foundAny) New->setAttrs(AttrVec()); 1611 1612 for (specific_attr_iterator<InheritableAttr> 1613 i = Old->specific_attr_begin<InheritableAttr>(), 1614 e = Old->specific_attr_end<InheritableAttr>(); 1615 i != e; ++i) { 1616 // Ignore deprecated/unavailable/availability attributes if requested. 1617 if (!MergeDeprecation && 1618 (isa<DeprecatedAttr>(*i) || 1619 isa<UnavailableAttr>(*i) || 1620 isa<AvailabilityAttr>(*i))) 1621 continue; 1622 1623 if (!DeclHasAttr(New, *i)) { 1624 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(Context)); 1625 newAttr->setInherited(true); 1626 New->addAttr(newAttr); 1627 foundAny = true; 1628 } 1629 } 1630 1631 if (!foundAny) New->dropAttrs(); 1632} 1633 1634/// mergeParamDeclAttributes - Copy attributes from the old parameter 1635/// to the new one. 1636static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1637 const ParmVarDecl *oldDecl, 1638 ASTContext &C) { 1639 if (!oldDecl->hasAttrs()) 1640 return; 1641 1642 bool foundAny = newDecl->hasAttrs(); 1643 1644 // Ensure that any moving of objects within the allocated map is 1645 // done before we process them. 1646 if (!foundAny) newDecl->setAttrs(AttrVec()); 1647 1648 for (specific_attr_iterator<InheritableParamAttr> 1649 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1650 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1651 if (!DeclHasAttr(newDecl, *i)) { 1652 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1653 newAttr->setInherited(true); 1654 newDecl->addAttr(newAttr); 1655 foundAny = true; 1656 } 1657 } 1658 1659 if (!foundAny) newDecl->dropAttrs(); 1660} 1661 1662namespace { 1663 1664/// Used in MergeFunctionDecl to keep track of function parameters in 1665/// C. 1666struct GNUCompatibleParamWarning { 1667 ParmVarDecl *OldParm; 1668 ParmVarDecl *NewParm; 1669 QualType PromotedType; 1670}; 1671 1672} 1673 1674/// getSpecialMember - get the special member enum for a method. 1675Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1676 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1677 if (Ctor->isDefaultConstructor()) 1678 return Sema::CXXDefaultConstructor; 1679 1680 if (Ctor->isCopyConstructor()) 1681 return Sema::CXXCopyConstructor; 1682 1683 if (Ctor->isMoveConstructor()) 1684 return Sema::CXXMoveConstructor; 1685 } else if (isa<CXXDestructorDecl>(MD)) { 1686 return Sema::CXXDestructor; 1687 } else if (MD->isCopyAssignmentOperator()) { 1688 return Sema::CXXCopyAssignment; 1689 } else if (MD->isMoveAssignmentOperator()) { 1690 return Sema::CXXMoveAssignment; 1691 } 1692 1693 return Sema::CXXInvalid; 1694} 1695 1696/// canRedefineFunction - checks if a function can be redefined. Currently, 1697/// only extern inline functions can be redefined, and even then only in 1698/// GNU89 mode. 1699static bool canRedefineFunction(const FunctionDecl *FD, 1700 const LangOptions& LangOpts) { 1701 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1702 !LangOpts.CPlusPlus && 1703 FD->isInlineSpecified() && 1704 FD->getStorageClass() == SC_Extern); 1705} 1706 1707/// MergeFunctionDecl - We just parsed a function 'New' from 1708/// declarator D which has the same name and scope as a previous 1709/// declaration 'Old'. Figure out how to resolve this situation, 1710/// merging decls or emitting diagnostics as appropriate. 1711/// 1712/// In C++, New and Old must be declarations that are not 1713/// overloaded. Use IsOverload to determine whether New and Old are 1714/// overloaded, and to select the Old declaration that New should be 1715/// merged with. 1716/// 1717/// Returns true if there was an error, false otherwise. 1718bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1719 // Verify the old decl was also a function. 1720 FunctionDecl *Old = 0; 1721 if (FunctionTemplateDecl *OldFunctionTemplate 1722 = dyn_cast<FunctionTemplateDecl>(OldD)) 1723 Old = OldFunctionTemplate->getTemplatedDecl(); 1724 else 1725 Old = dyn_cast<FunctionDecl>(OldD); 1726 if (!Old) { 1727 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1728 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1729 Diag(Shadow->getTargetDecl()->getLocation(), 1730 diag::note_using_decl_target); 1731 Diag(Shadow->getUsingDecl()->getLocation(), 1732 diag::note_using_decl) << 0; 1733 return true; 1734 } 1735 1736 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1737 << New->getDeclName(); 1738 Diag(OldD->getLocation(), diag::note_previous_definition); 1739 return true; 1740 } 1741 1742 // Determine whether the previous declaration was a definition, 1743 // implicit declaration, or a declaration. 1744 diag::kind PrevDiag; 1745 if (Old->isThisDeclarationADefinition()) 1746 PrevDiag = diag::note_previous_definition; 1747 else if (Old->isImplicit()) 1748 PrevDiag = diag::note_previous_implicit_declaration; 1749 else 1750 PrevDiag = diag::note_previous_declaration; 1751 1752 QualType OldQType = Context.getCanonicalType(Old->getType()); 1753 QualType NewQType = Context.getCanonicalType(New->getType()); 1754 1755 // Don't complain about this if we're in GNU89 mode and the old function 1756 // is an extern inline function. 1757 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1758 New->getStorageClass() == SC_Static && 1759 Old->getStorageClass() != SC_Static && 1760 !canRedefineFunction(Old, getLangOptions())) { 1761 if (getLangOptions().MicrosoftExt) { 1762 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1763 Diag(Old->getLocation(), PrevDiag); 1764 } else { 1765 Diag(New->getLocation(), diag::err_static_non_static) << New; 1766 Diag(Old->getLocation(), PrevDiag); 1767 return true; 1768 } 1769 } 1770 1771 // If a function is first declared with a calling convention, but is 1772 // later declared or defined without one, the second decl assumes the 1773 // calling convention of the first. 1774 // 1775 // For the new decl, we have to look at the NON-canonical type to tell the 1776 // difference between a function that really doesn't have a calling 1777 // convention and one that is declared cdecl. That's because in 1778 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1779 // because it is the default calling convention. 1780 // 1781 // Note also that we DO NOT return at this point, because we still have 1782 // other tests to run. 1783 const FunctionType *OldType = cast<FunctionType>(OldQType); 1784 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1785 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1786 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1787 bool RequiresAdjustment = false; 1788 if (OldTypeInfo.getCC() != CC_Default && 1789 NewTypeInfo.getCC() == CC_Default) { 1790 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1791 RequiresAdjustment = true; 1792 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1793 NewTypeInfo.getCC())) { 1794 // Calling conventions really aren't compatible, so complain. 1795 Diag(New->getLocation(), diag::err_cconv_change) 1796 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1797 << (OldTypeInfo.getCC() == CC_Default) 1798 << (OldTypeInfo.getCC() == CC_Default ? "" : 1799 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1800 Diag(Old->getLocation(), diag::note_previous_declaration); 1801 return true; 1802 } 1803 1804 // FIXME: diagnose the other way around? 1805 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1806 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1807 RequiresAdjustment = true; 1808 } 1809 1810 // Merge regparm attribute. 1811 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1812 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1813 if (NewTypeInfo.getHasRegParm()) { 1814 Diag(New->getLocation(), diag::err_regparm_mismatch) 1815 << NewType->getRegParmType() 1816 << OldType->getRegParmType(); 1817 Diag(Old->getLocation(), diag::note_previous_declaration); 1818 return true; 1819 } 1820 1821 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1822 RequiresAdjustment = true; 1823 } 1824 1825 // Merge ns_returns_retained attribute. 1826 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1827 if (NewTypeInfo.getProducesResult()) { 1828 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1829 Diag(Old->getLocation(), diag::note_previous_declaration); 1830 return true; 1831 } 1832 1833 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1834 RequiresAdjustment = true; 1835 } 1836 1837 if (RequiresAdjustment) { 1838 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1839 New->setType(QualType(NewType, 0)); 1840 NewQType = Context.getCanonicalType(New->getType()); 1841 } 1842 1843 if (getLangOptions().CPlusPlus) { 1844 // (C++98 13.1p2): 1845 // Certain function declarations cannot be overloaded: 1846 // -- Function declarations that differ only in the return type 1847 // cannot be overloaded. 1848 QualType OldReturnType = OldType->getResultType(); 1849 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1850 QualType ResQT; 1851 if (OldReturnType != NewReturnType) { 1852 if (NewReturnType->isObjCObjectPointerType() 1853 && OldReturnType->isObjCObjectPointerType()) 1854 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1855 if (ResQT.isNull()) { 1856 if (New->isCXXClassMember() && New->isOutOfLine()) 1857 Diag(New->getLocation(), 1858 diag::err_member_def_does_not_match_ret_type) << New; 1859 else 1860 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1861 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1862 return true; 1863 } 1864 else 1865 NewQType = ResQT; 1866 } 1867 1868 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1869 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1870 if (OldMethod && NewMethod) { 1871 // Preserve triviality. 1872 NewMethod->setTrivial(OldMethod->isTrivial()); 1873 1874 // MSVC allows explicit template specialization at class scope: 1875 // 2 CXMethodDecls referring to the same function will be injected. 1876 // We don't want a redeclartion error. 1877 bool IsClassScopeExplicitSpecialization = 1878 OldMethod->isFunctionTemplateSpecialization() && 1879 NewMethod->isFunctionTemplateSpecialization(); 1880 bool isFriend = NewMethod->getFriendObjectKind(); 1881 1882 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1883 !IsClassScopeExplicitSpecialization) { 1884 // -- Member function declarations with the same name and the 1885 // same parameter types cannot be overloaded if any of them 1886 // is a static member function declaration. 1887 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1888 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1889 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1890 return true; 1891 } 1892 1893 // C++ [class.mem]p1: 1894 // [...] A member shall not be declared twice in the 1895 // member-specification, except that a nested class or member 1896 // class template can be declared and then later defined. 1897 unsigned NewDiag; 1898 if (isa<CXXConstructorDecl>(OldMethod)) 1899 NewDiag = diag::err_constructor_redeclared; 1900 else if (isa<CXXDestructorDecl>(NewMethod)) 1901 NewDiag = diag::err_destructor_redeclared; 1902 else if (isa<CXXConversionDecl>(NewMethod)) 1903 NewDiag = diag::err_conv_function_redeclared; 1904 else 1905 NewDiag = diag::err_member_redeclared; 1906 1907 Diag(New->getLocation(), NewDiag); 1908 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1909 1910 // Complain if this is an explicit declaration of a special 1911 // member that was initially declared implicitly. 1912 // 1913 // As an exception, it's okay to befriend such methods in order 1914 // to permit the implicit constructor/destructor/operator calls. 1915 } else if (OldMethod->isImplicit()) { 1916 if (isFriend) { 1917 NewMethod->setImplicit(); 1918 } else { 1919 Diag(NewMethod->getLocation(), 1920 diag::err_definition_of_implicitly_declared_member) 1921 << New << getSpecialMember(OldMethod); 1922 return true; 1923 } 1924 } else if (OldMethod->isExplicitlyDefaulted()) { 1925 Diag(NewMethod->getLocation(), 1926 diag::err_definition_of_explicitly_defaulted_member) 1927 << getSpecialMember(OldMethod); 1928 return true; 1929 } 1930 } 1931 1932 // (C++98 8.3.5p3): 1933 // All declarations for a function shall agree exactly in both the 1934 // return type and the parameter-type-list. 1935 // We also want to respect all the extended bits except noreturn. 1936 1937 // noreturn should now match unless the old type info didn't have it. 1938 QualType OldQTypeForComparison = OldQType; 1939 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1940 assert(OldQType == QualType(OldType, 0)); 1941 const FunctionType *OldTypeForComparison 1942 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1943 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1944 assert(OldQTypeForComparison.isCanonical()); 1945 } 1946 1947 if (OldQTypeForComparison == NewQType) 1948 return MergeCompatibleFunctionDecls(New, Old); 1949 1950 // Fall through for conflicting redeclarations and redefinitions. 1951 } 1952 1953 // C: Function types need to be compatible, not identical. This handles 1954 // duplicate function decls like "void f(int); void f(enum X);" properly. 1955 if (!getLangOptions().CPlusPlus && 1956 Context.typesAreCompatible(OldQType, NewQType)) { 1957 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1958 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1959 const FunctionProtoType *OldProto = 0; 1960 if (isa<FunctionNoProtoType>(NewFuncType) && 1961 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1962 // The old declaration provided a function prototype, but the 1963 // new declaration does not. Merge in the prototype. 1964 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1965 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1966 OldProto->arg_type_end()); 1967 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1968 ParamTypes.data(), ParamTypes.size(), 1969 OldProto->getExtProtoInfo()); 1970 New->setType(NewQType); 1971 New->setHasInheritedPrototype(); 1972 1973 // Synthesize a parameter for each argument type. 1974 SmallVector<ParmVarDecl*, 16> Params; 1975 for (FunctionProtoType::arg_type_iterator 1976 ParamType = OldProto->arg_type_begin(), 1977 ParamEnd = OldProto->arg_type_end(); 1978 ParamType != ParamEnd; ++ParamType) { 1979 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1980 SourceLocation(), 1981 SourceLocation(), 0, 1982 *ParamType, /*TInfo=*/0, 1983 SC_None, SC_None, 1984 0); 1985 Param->setScopeInfo(0, Params.size()); 1986 Param->setImplicit(); 1987 Params.push_back(Param); 1988 } 1989 1990 New->setParams(Params); 1991 } 1992 1993 return MergeCompatibleFunctionDecls(New, Old); 1994 } 1995 1996 // GNU C permits a K&R definition to follow a prototype declaration 1997 // if the declared types of the parameters in the K&R definition 1998 // match the types in the prototype declaration, even when the 1999 // promoted types of the parameters from the K&R definition differ 2000 // from the types in the prototype. GCC then keeps the types from 2001 // the prototype. 2002 // 2003 // If a variadic prototype is followed by a non-variadic K&R definition, 2004 // the K&R definition becomes variadic. This is sort of an edge case, but 2005 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2006 // C99 6.9.1p8. 2007 if (!getLangOptions().CPlusPlus && 2008 Old->hasPrototype() && !New->hasPrototype() && 2009 New->getType()->getAs<FunctionProtoType>() && 2010 Old->getNumParams() == New->getNumParams()) { 2011 SmallVector<QualType, 16> ArgTypes; 2012 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2013 const FunctionProtoType *OldProto 2014 = Old->getType()->getAs<FunctionProtoType>(); 2015 const FunctionProtoType *NewProto 2016 = New->getType()->getAs<FunctionProtoType>(); 2017 2018 // Determine whether this is the GNU C extension. 2019 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2020 NewProto->getResultType()); 2021 bool LooseCompatible = !MergedReturn.isNull(); 2022 for (unsigned Idx = 0, End = Old->getNumParams(); 2023 LooseCompatible && Idx != End; ++Idx) { 2024 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2025 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2026 if (Context.typesAreCompatible(OldParm->getType(), 2027 NewProto->getArgType(Idx))) { 2028 ArgTypes.push_back(NewParm->getType()); 2029 } else if (Context.typesAreCompatible(OldParm->getType(), 2030 NewParm->getType(), 2031 /*CompareUnqualified=*/true)) { 2032 GNUCompatibleParamWarning Warn 2033 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2034 Warnings.push_back(Warn); 2035 ArgTypes.push_back(NewParm->getType()); 2036 } else 2037 LooseCompatible = false; 2038 } 2039 2040 if (LooseCompatible) { 2041 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2042 Diag(Warnings[Warn].NewParm->getLocation(), 2043 diag::ext_param_promoted_not_compatible_with_prototype) 2044 << Warnings[Warn].PromotedType 2045 << Warnings[Warn].OldParm->getType(); 2046 if (Warnings[Warn].OldParm->getLocation().isValid()) 2047 Diag(Warnings[Warn].OldParm->getLocation(), 2048 diag::note_previous_declaration); 2049 } 2050 2051 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2052 ArgTypes.size(), 2053 OldProto->getExtProtoInfo())); 2054 return MergeCompatibleFunctionDecls(New, Old); 2055 } 2056 2057 // Fall through to diagnose conflicting types. 2058 } 2059 2060 // A function that has already been declared has been redeclared or defined 2061 // with a different type- show appropriate diagnostic 2062 if (unsigned BuiltinID = Old->getBuiltinID()) { 2063 // The user has declared a builtin function with an incompatible 2064 // signature. 2065 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2066 // The function the user is redeclaring is a library-defined 2067 // function like 'malloc' or 'printf'. Warn about the 2068 // redeclaration, then pretend that we don't know about this 2069 // library built-in. 2070 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2071 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2072 << Old << Old->getType(); 2073 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2074 Old->setInvalidDecl(); 2075 return false; 2076 } 2077 2078 PrevDiag = diag::note_previous_builtin_declaration; 2079 } 2080 2081 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2082 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2083 return true; 2084} 2085 2086/// \brief Completes the merge of two function declarations that are 2087/// known to be compatible. 2088/// 2089/// This routine handles the merging of attributes and other 2090/// properties of function declarations form the old declaration to 2091/// the new declaration, once we know that New is in fact a 2092/// redeclaration of Old. 2093/// 2094/// \returns false 2095bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2096 // Merge the attributes 2097 mergeDeclAttributes(New, Old); 2098 2099 // Merge the storage class. 2100 if (Old->getStorageClass() != SC_Extern && 2101 Old->getStorageClass() != SC_None) 2102 New->setStorageClass(Old->getStorageClass()); 2103 2104 // Merge "pure" flag. 2105 if (Old->isPure()) 2106 New->setPure(); 2107 2108 // Merge attributes from the parameters. These can mismatch with K&R 2109 // declarations. 2110 if (New->getNumParams() == Old->getNumParams()) 2111 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2112 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2113 Context); 2114 2115 if (getLangOptions().CPlusPlus) 2116 return MergeCXXFunctionDecl(New, Old); 2117 2118 return false; 2119} 2120 2121 2122void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2123 ObjCMethodDecl *oldMethod) { 2124 // We don't want to merge unavailable and deprecated attributes 2125 // except from interface to implementation. 2126 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2127 2128 // Merge the attributes. 2129 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2130 2131 // Merge attributes from the parameters. 2132 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2133 for (ObjCMethodDecl::param_iterator 2134 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2135 ni != ne; ++ni, ++oi) 2136 mergeParamDeclAttributes(*ni, *oi, Context); 2137 2138 CheckObjCMethodOverride(newMethod, oldMethod, true); 2139} 2140 2141/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2142/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2143/// emitting diagnostics as appropriate. 2144/// 2145/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2146/// to here in AddInitializerToDecl. We can't check them before the initializer 2147/// is attached. 2148void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2149 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2150 return; 2151 2152 QualType MergedT; 2153 if (getLangOptions().CPlusPlus) { 2154 AutoType *AT = New->getType()->getContainedAutoType(); 2155 if (AT && !AT->isDeduced()) { 2156 // We don't know what the new type is until the initializer is attached. 2157 return; 2158 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2159 // These could still be something that needs exception specs checked. 2160 return MergeVarDeclExceptionSpecs(New, Old); 2161 } 2162 // C++ [basic.link]p10: 2163 // [...] the types specified by all declarations referring to a given 2164 // object or function shall be identical, except that declarations for an 2165 // array object can specify array types that differ by the presence or 2166 // absence of a major array bound (8.3.4). 2167 else if (Old->getType()->isIncompleteArrayType() && 2168 New->getType()->isArrayType()) { 2169 CanQual<ArrayType> OldArray 2170 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2171 CanQual<ArrayType> NewArray 2172 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2173 if (OldArray->getElementType() == NewArray->getElementType()) 2174 MergedT = New->getType(); 2175 } else if (Old->getType()->isArrayType() && 2176 New->getType()->isIncompleteArrayType()) { 2177 CanQual<ArrayType> OldArray 2178 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2179 CanQual<ArrayType> NewArray 2180 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2181 if (OldArray->getElementType() == NewArray->getElementType()) 2182 MergedT = Old->getType(); 2183 } else if (New->getType()->isObjCObjectPointerType() 2184 && Old->getType()->isObjCObjectPointerType()) { 2185 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2186 Old->getType()); 2187 } 2188 } else { 2189 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2190 } 2191 if (MergedT.isNull()) { 2192 Diag(New->getLocation(), diag::err_redefinition_different_type) 2193 << New->getDeclName(); 2194 Diag(Old->getLocation(), diag::note_previous_definition); 2195 return New->setInvalidDecl(); 2196 } 2197 New->setType(MergedT); 2198} 2199 2200/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2201/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2202/// situation, merging decls or emitting diagnostics as appropriate. 2203/// 2204/// Tentative definition rules (C99 6.9.2p2) are checked by 2205/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2206/// definitions here, since the initializer hasn't been attached. 2207/// 2208void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2209 // If the new decl is already invalid, don't do any other checking. 2210 if (New->isInvalidDecl()) 2211 return; 2212 2213 // Verify the old decl was also a variable. 2214 VarDecl *Old = 0; 2215 if (!Previous.isSingleResult() || 2216 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2217 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2218 << New->getDeclName(); 2219 Diag(Previous.getRepresentativeDecl()->getLocation(), 2220 diag::note_previous_definition); 2221 return New->setInvalidDecl(); 2222 } 2223 2224 // C++ [class.mem]p1: 2225 // A member shall not be declared twice in the member-specification [...] 2226 // 2227 // Here, we need only consider static data members. 2228 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2229 Diag(New->getLocation(), diag::err_duplicate_member) 2230 << New->getIdentifier(); 2231 Diag(Old->getLocation(), diag::note_previous_declaration); 2232 New->setInvalidDecl(); 2233 } 2234 2235 mergeDeclAttributes(New, Old); 2236 // Warn if an already-declared variable is made a weak_import in a subsequent 2237 // declaration 2238 if (New->getAttr<WeakImportAttr>() && 2239 Old->getStorageClass() == SC_None && 2240 !Old->getAttr<WeakImportAttr>()) { 2241 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2242 Diag(Old->getLocation(), diag::note_previous_definition); 2243 // Remove weak_import attribute on new declaration. 2244 New->dropAttr<WeakImportAttr>(); 2245 } 2246 2247 // Merge the types. 2248 MergeVarDeclTypes(New, Old); 2249 if (New->isInvalidDecl()) 2250 return; 2251 2252 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2253 if (New->getStorageClass() == SC_Static && 2254 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2255 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2256 Diag(Old->getLocation(), diag::note_previous_definition); 2257 return New->setInvalidDecl(); 2258 } 2259 // C99 6.2.2p4: 2260 // For an identifier declared with the storage-class specifier 2261 // extern in a scope in which a prior declaration of that 2262 // identifier is visible,23) if the prior declaration specifies 2263 // internal or external linkage, the linkage of the identifier at 2264 // the later declaration is the same as the linkage specified at 2265 // the prior declaration. If no prior declaration is visible, or 2266 // if the prior declaration specifies no linkage, then the 2267 // identifier has external linkage. 2268 if (New->hasExternalStorage() && Old->hasLinkage()) 2269 /* Okay */; 2270 else if (New->getStorageClass() != SC_Static && 2271 Old->getStorageClass() == SC_Static) { 2272 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2273 Diag(Old->getLocation(), diag::note_previous_definition); 2274 return New->setInvalidDecl(); 2275 } 2276 2277 // Check if extern is followed by non-extern and vice-versa. 2278 if (New->hasExternalStorage() && 2279 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2280 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2281 Diag(Old->getLocation(), diag::note_previous_definition); 2282 return New->setInvalidDecl(); 2283 } 2284 if (Old->hasExternalStorage() && 2285 !New->hasLinkage() && New->isLocalVarDecl()) { 2286 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2287 Diag(Old->getLocation(), diag::note_previous_definition); 2288 return New->setInvalidDecl(); 2289 } 2290 2291 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2292 2293 // FIXME: The test for external storage here seems wrong? We still 2294 // need to check for mismatches. 2295 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2296 // Don't complain about out-of-line definitions of static members. 2297 !(Old->getLexicalDeclContext()->isRecord() && 2298 !New->getLexicalDeclContext()->isRecord())) { 2299 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2300 Diag(Old->getLocation(), diag::note_previous_definition); 2301 return New->setInvalidDecl(); 2302 } 2303 2304 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2305 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2306 Diag(Old->getLocation(), diag::note_previous_definition); 2307 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2308 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2309 Diag(Old->getLocation(), diag::note_previous_definition); 2310 } 2311 2312 // C++ doesn't have tentative definitions, so go right ahead and check here. 2313 const VarDecl *Def; 2314 if (getLangOptions().CPlusPlus && 2315 New->isThisDeclarationADefinition() == VarDecl::Definition && 2316 (Def = Old->getDefinition())) { 2317 Diag(New->getLocation(), diag::err_redefinition) 2318 << New->getDeclName(); 2319 Diag(Def->getLocation(), diag::note_previous_definition); 2320 New->setInvalidDecl(); 2321 return; 2322 } 2323 // c99 6.2.2 P4. 2324 // For an identifier declared with the storage-class specifier extern in a 2325 // scope in which a prior declaration of that identifier is visible, if 2326 // the prior declaration specifies internal or external linkage, the linkage 2327 // of the identifier at the later declaration is the same as the linkage 2328 // specified at the prior declaration. 2329 // FIXME. revisit this code. 2330 if (New->hasExternalStorage() && 2331 Old->getLinkage() == InternalLinkage && 2332 New->getDeclContext() == Old->getDeclContext()) 2333 New->setStorageClass(Old->getStorageClass()); 2334 2335 // Keep a chain of previous declarations. 2336 New->setPreviousDeclaration(Old); 2337 2338 // Inherit access appropriately. 2339 New->setAccess(Old->getAccess()); 2340} 2341 2342/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2343/// no declarator (e.g. "struct foo;") is parsed. 2344Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2345 DeclSpec &DS) { 2346 return ParsedFreeStandingDeclSpec(S, AS, DS, 2347 MultiTemplateParamsArg(*this, 0, 0)); 2348} 2349 2350/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2351/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2352/// parameters to cope with template friend declarations. 2353Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2354 DeclSpec &DS, 2355 MultiTemplateParamsArg TemplateParams) { 2356 Decl *TagD = 0; 2357 TagDecl *Tag = 0; 2358 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2359 DS.getTypeSpecType() == DeclSpec::TST_struct || 2360 DS.getTypeSpecType() == DeclSpec::TST_union || 2361 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2362 TagD = DS.getRepAsDecl(); 2363 2364 if (!TagD) // We probably had an error 2365 return 0; 2366 2367 // Note that the above type specs guarantee that the 2368 // type rep is a Decl, whereas in many of the others 2369 // it's a Type. 2370 if (isa<TagDecl>(TagD)) 2371 Tag = cast<TagDecl>(TagD); 2372 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2373 Tag = CTD->getTemplatedDecl(); 2374 } 2375 2376 if (Tag) 2377 Tag->setFreeStanding(); 2378 2379 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2380 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2381 // or incomplete types shall not be restrict-qualified." 2382 if (TypeQuals & DeclSpec::TQ_restrict) 2383 Diag(DS.getRestrictSpecLoc(), 2384 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2385 << DS.getSourceRange(); 2386 } 2387 2388 if (DS.isConstexprSpecified()) { 2389 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2390 // and definitions of functions and variables. 2391 if (Tag) 2392 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2393 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2394 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2395 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2396 else 2397 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2398 // Don't emit warnings after this error. 2399 return TagD; 2400 } 2401 2402 if (DS.isFriendSpecified()) { 2403 // If we're dealing with a decl but not a TagDecl, assume that 2404 // whatever routines created it handled the friendship aspect. 2405 if (TagD && !Tag) 2406 return 0; 2407 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2408 } 2409 2410 // Track whether we warned about the fact that there aren't any 2411 // declarators. 2412 bool emittedWarning = false; 2413 2414 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2415 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2416 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2417 if (getLangOptions().CPlusPlus || 2418 Record->getDeclContext()->isRecord()) 2419 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2420 2421 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2422 << DS.getSourceRange(); 2423 emittedWarning = true; 2424 } 2425 } 2426 2427 // Check for Microsoft C extension: anonymous struct. 2428 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2429 CurContext->isRecord() && 2430 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2431 // Handle 2 kinds of anonymous struct: 2432 // struct STRUCT; 2433 // and 2434 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2435 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2436 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2437 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2438 DS.getRepAsType().get()->isStructureType())) { 2439 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2440 << DS.getSourceRange(); 2441 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2442 } 2443 } 2444 2445 if (getLangOptions().CPlusPlus && 2446 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2447 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2448 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2449 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2450 Diag(Enum->getLocation(), diag::ext_no_declarators) 2451 << DS.getSourceRange(); 2452 emittedWarning = true; 2453 } 2454 2455 // Skip all the checks below if we have a type error. 2456 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2457 2458 if (!DS.isMissingDeclaratorOk()) { 2459 // Warn about typedefs of enums without names, since this is an 2460 // extension in both Microsoft and GNU. 2461 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2462 Tag && isa<EnumDecl>(Tag)) { 2463 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2464 << DS.getSourceRange(); 2465 return Tag; 2466 } 2467 2468 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2469 << DS.getSourceRange(); 2470 emittedWarning = true; 2471 } 2472 2473 // We're going to complain about a bunch of spurious specifiers; 2474 // only do this if we're declaring a tag, because otherwise we 2475 // should be getting diag::ext_no_declarators. 2476 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2477 return TagD; 2478 2479 // Note that a linkage-specification sets a storage class, but 2480 // 'extern "C" struct foo;' is actually valid and not theoretically 2481 // useless. 2482 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2483 if (!DS.isExternInLinkageSpec()) 2484 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2485 << DeclSpec::getSpecifierName(scs); 2486 2487 if (DS.isThreadSpecified()) 2488 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2489 if (DS.getTypeQualifiers()) { 2490 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2491 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2492 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2493 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2494 // Restrict is covered above. 2495 } 2496 if (DS.isInlineSpecified()) 2497 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2498 if (DS.isVirtualSpecified()) 2499 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2500 if (DS.isExplicitSpecified()) 2501 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2502 2503 if (DS.isModulePrivateSpecified() && 2504 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2505 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2506 << Tag->getTagKind() 2507 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2508 2509 // Warn about ignored type attributes, for example: 2510 // __attribute__((aligned)) struct A; 2511 // Attributes should be placed after tag to apply to type declaration. 2512 if (!DS.getAttributes().empty()) { 2513 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2514 if (TypeSpecType == DeclSpec::TST_class || 2515 TypeSpecType == DeclSpec::TST_struct || 2516 TypeSpecType == DeclSpec::TST_union || 2517 TypeSpecType == DeclSpec::TST_enum) { 2518 AttributeList* attrs = DS.getAttributes().getList(); 2519 while (attrs) { 2520 Diag(attrs->getScopeLoc(), 2521 diag::warn_declspec_attribute_ignored) 2522 << attrs->getName() 2523 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2524 TypeSpecType == DeclSpec::TST_struct ? 1 : 2525 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2526 attrs = attrs->getNext(); 2527 } 2528 } 2529 } 2530 2531 return TagD; 2532} 2533 2534/// We are trying to inject an anonymous member into the given scope; 2535/// check if there's an existing declaration that can't be overloaded. 2536/// 2537/// \return true if this is a forbidden redeclaration 2538static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2539 Scope *S, 2540 DeclContext *Owner, 2541 DeclarationName Name, 2542 SourceLocation NameLoc, 2543 unsigned diagnostic) { 2544 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2545 Sema::ForRedeclaration); 2546 if (!SemaRef.LookupName(R, S)) return false; 2547 2548 if (R.getAsSingle<TagDecl>()) 2549 return false; 2550 2551 // Pick a representative declaration. 2552 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2553 assert(PrevDecl && "Expected a non-null Decl"); 2554 2555 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2556 return false; 2557 2558 SemaRef.Diag(NameLoc, diagnostic) << Name; 2559 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2560 2561 return true; 2562} 2563 2564/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2565/// anonymous struct or union AnonRecord into the owning context Owner 2566/// and scope S. This routine will be invoked just after we realize 2567/// that an unnamed union or struct is actually an anonymous union or 2568/// struct, e.g., 2569/// 2570/// @code 2571/// union { 2572/// int i; 2573/// float f; 2574/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2575/// // f into the surrounding scope.x 2576/// @endcode 2577/// 2578/// This routine is recursive, injecting the names of nested anonymous 2579/// structs/unions into the owning context and scope as well. 2580static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2581 DeclContext *Owner, 2582 RecordDecl *AnonRecord, 2583 AccessSpecifier AS, 2584 SmallVector<NamedDecl*, 2> &Chaining, 2585 bool MSAnonStruct) { 2586 unsigned diagKind 2587 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2588 : diag::err_anonymous_struct_member_redecl; 2589 2590 bool Invalid = false; 2591 2592 // Look every FieldDecl and IndirectFieldDecl with a name. 2593 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2594 DEnd = AnonRecord->decls_end(); 2595 D != DEnd; ++D) { 2596 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2597 cast<NamedDecl>(*D)->getDeclName()) { 2598 ValueDecl *VD = cast<ValueDecl>(*D); 2599 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2600 VD->getLocation(), diagKind)) { 2601 // C++ [class.union]p2: 2602 // The names of the members of an anonymous union shall be 2603 // distinct from the names of any other entity in the 2604 // scope in which the anonymous union is declared. 2605 Invalid = true; 2606 } else { 2607 // C++ [class.union]p2: 2608 // For the purpose of name lookup, after the anonymous union 2609 // definition, the members of the anonymous union are 2610 // considered to have been defined in the scope in which the 2611 // anonymous union is declared. 2612 unsigned OldChainingSize = Chaining.size(); 2613 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2614 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2615 PE = IF->chain_end(); PI != PE; ++PI) 2616 Chaining.push_back(*PI); 2617 else 2618 Chaining.push_back(VD); 2619 2620 assert(Chaining.size() >= 2); 2621 NamedDecl **NamedChain = 2622 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2623 for (unsigned i = 0; i < Chaining.size(); i++) 2624 NamedChain[i] = Chaining[i]; 2625 2626 IndirectFieldDecl* IndirectField = 2627 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2628 VD->getIdentifier(), VD->getType(), 2629 NamedChain, Chaining.size()); 2630 2631 IndirectField->setAccess(AS); 2632 IndirectField->setImplicit(); 2633 SemaRef.PushOnScopeChains(IndirectField, S); 2634 2635 // That includes picking up the appropriate access specifier. 2636 if (AS != AS_none) IndirectField->setAccess(AS); 2637 2638 Chaining.resize(OldChainingSize); 2639 } 2640 } 2641 } 2642 2643 return Invalid; 2644} 2645 2646/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2647/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2648/// illegal input values are mapped to SC_None. 2649static StorageClass 2650StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2651 switch (StorageClassSpec) { 2652 case DeclSpec::SCS_unspecified: return SC_None; 2653 case DeclSpec::SCS_extern: return SC_Extern; 2654 case DeclSpec::SCS_static: return SC_Static; 2655 case DeclSpec::SCS_auto: return SC_Auto; 2656 case DeclSpec::SCS_register: return SC_Register; 2657 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2658 // Illegal SCSs map to None: error reporting is up to the caller. 2659 case DeclSpec::SCS_mutable: // Fall through. 2660 case DeclSpec::SCS_typedef: return SC_None; 2661 } 2662 llvm_unreachable("unknown storage class specifier"); 2663} 2664 2665/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2666/// a StorageClass. Any error reporting is up to the caller: 2667/// illegal input values are mapped to SC_None. 2668static StorageClass 2669StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2670 switch (StorageClassSpec) { 2671 case DeclSpec::SCS_unspecified: return SC_None; 2672 case DeclSpec::SCS_extern: return SC_Extern; 2673 case DeclSpec::SCS_static: return SC_Static; 2674 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2675 // Illegal SCSs map to None: error reporting is up to the caller. 2676 case DeclSpec::SCS_auto: // Fall through. 2677 case DeclSpec::SCS_mutable: // Fall through. 2678 case DeclSpec::SCS_register: // Fall through. 2679 case DeclSpec::SCS_typedef: return SC_None; 2680 } 2681 llvm_unreachable("unknown storage class specifier"); 2682} 2683 2684/// BuildAnonymousStructOrUnion - Handle the declaration of an 2685/// anonymous structure or union. Anonymous unions are a C++ feature 2686/// (C++ [class.union]) and a C11 feature; anonymous structures 2687/// are a C11 feature and GNU C++ extension. 2688Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2689 AccessSpecifier AS, 2690 RecordDecl *Record) { 2691 DeclContext *Owner = Record->getDeclContext(); 2692 2693 // Diagnose whether this anonymous struct/union is an extension. 2694 if (Record->isUnion() && !getLangOptions().CPlusPlus && !getLangOptions().C11) 2695 Diag(Record->getLocation(), diag::ext_anonymous_union); 2696 else if (!Record->isUnion() && getLangOptions().CPlusPlus) 2697 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2698 else if (!Record->isUnion() && !getLangOptions().C11) 2699 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2700 2701 // C and C++ require different kinds of checks for anonymous 2702 // structs/unions. 2703 bool Invalid = false; 2704 if (getLangOptions().CPlusPlus) { 2705 const char* PrevSpec = 0; 2706 unsigned DiagID; 2707 if (Record->isUnion()) { 2708 // C++ [class.union]p6: 2709 // Anonymous unions declared in a named namespace or in the 2710 // global namespace shall be declared static. 2711 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2712 (isa<TranslationUnitDecl>(Owner) || 2713 (isa<NamespaceDecl>(Owner) && 2714 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2715 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2716 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2717 2718 // Recover by adding 'static'. 2719 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2720 PrevSpec, DiagID); 2721 } 2722 // C++ [class.union]p6: 2723 // A storage class is not allowed in a declaration of an 2724 // anonymous union in a class scope. 2725 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2726 isa<RecordDecl>(Owner)) { 2727 Diag(DS.getStorageClassSpecLoc(), 2728 diag::err_anonymous_union_with_storage_spec) 2729 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2730 2731 // Recover by removing the storage specifier. 2732 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2733 SourceLocation(), 2734 PrevSpec, DiagID); 2735 } 2736 } 2737 2738 // Ignore const/volatile/restrict qualifiers. 2739 if (DS.getTypeQualifiers()) { 2740 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2741 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2742 << Record->isUnion() << 0 2743 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2744 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2745 Diag(DS.getVolatileSpecLoc(), 2746 diag::ext_anonymous_struct_union_qualified) 2747 << Record->isUnion() << 1 2748 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2749 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2750 Diag(DS.getRestrictSpecLoc(), 2751 diag::ext_anonymous_struct_union_qualified) 2752 << Record->isUnion() << 2 2753 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2754 2755 DS.ClearTypeQualifiers(); 2756 } 2757 2758 // C++ [class.union]p2: 2759 // The member-specification of an anonymous union shall only 2760 // define non-static data members. [Note: nested types and 2761 // functions cannot be declared within an anonymous union. ] 2762 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2763 MemEnd = Record->decls_end(); 2764 Mem != MemEnd; ++Mem) { 2765 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2766 // C++ [class.union]p3: 2767 // An anonymous union shall not have private or protected 2768 // members (clause 11). 2769 assert(FD->getAccess() != AS_none); 2770 if (FD->getAccess() != AS_public) { 2771 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2772 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2773 Invalid = true; 2774 } 2775 2776 // C++ [class.union]p1 2777 // An object of a class with a non-trivial constructor, a non-trivial 2778 // copy constructor, a non-trivial destructor, or a non-trivial copy 2779 // assignment operator cannot be a member of a union, nor can an 2780 // array of such objects. 2781 if (CheckNontrivialField(FD)) 2782 Invalid = true; 2783 } else if ((*Mem)->isImplicit()) { 2784 // Any implicit members are fine. 2785 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2786 // This is a type that showed up in an 2787 // elaborated-type-specifier inside the anonymous struct or 2788 // union, but which actually declares a type outside of the 2789 // anonymous struct or union. It's okay. 2790 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2791 if (!MemRecord->isAnonymousStructOrUnion() && 2792 MemRecord->getDeclName()) { 2793 // Visual C++ allows type definition in anonymous struct or union. 2794 if (getLangOptions().MicrosoftExt) 2795 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2796 << (int)Record->isUnion(); 2797 else { 2798 // This is a nested type declaration. 2799 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2800 << (int)Record->isUnion(); 2801 Invalid = true; 2802 } 2803 } 2804 } else if (isa<AccessSpecDecl>(*Mem)) { 2805 // Any access specifier is fine. 2806 } else { 2807 // We have something that isn't a non-static data 2808 // member. Complain about it. 2809 unsigned DK = diag::err_anonymous_record_bad_member; 2810 if (isa<TypeDecl>(*Mem)) 2811 DK = diag::err_anonymous_record_with_type; 2812 else if (isa<FunctionDecl>(*Mem)) 2813 DK = diag::err_anonymous_record_with_function; 2814 else if (isa<VarDecl>(*Mem)) 2815 DK = diag::err_anonymous_record_with_static; 2816 2817 // Visual C++ allows type definition in anonymous struct or union. 2818 if (getLangOptions().MicrosoftExt && 2819 DK == diag::err_anonymous_record_with_type) 2820 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2821 << (int)Record->isUnion(); 2822 else { 2823 Diag((*Mem)->getLocation(), DK) 2824 << (int)Record->isUnion(); 2825 Invalid = true; 2826 } 2827 } 2828 } 2829 } 2830 2831 if (!Record->isUnion() && !Owner->isRecord()) { 2832 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2833 << (int)getLangOptions().CPlusPlus; 2834 Invalid = true; 2835 } 2836 2837 // Mock up a declarator. 2838 Declarator Dc(DS, Declarator::MemberContext); 2839 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2840 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2841 2842 // Create a declaration for this anonymous struct/union. 2843 NamedDecl *Anon = 0; 2844 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2845 Anon = FieldDecl::Create(Context, OwningClass, 2846 DS.getSourceRange().getBegin(), 2847 Record->getLocation(), 2848 /*IdentifierInfo=*/0, 2849 Context.getTypeDeclType(Record), 2850 TInfo, 2851 /*BitWidth=*/0, /*Mutable=*/false, 2852 /*HasInit=*/false); 2853 Anon->setAccess(AS); 2854 if (getLangOptions().CPlusPlus) 2855 FieldCollector->Add(cast<FieldDecl>(Anon)); 2856 } else { 2857 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2858 assert(SCSpec != DeclSpec::SCS_typedef && 2859 "Parser allowed 'typedef' as storage class VarDecl."); 2860 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2861 if (SCSpec == DeclSpec::SCS_mutable) { 2862 // mutable can only appear on non-static class members, so it's always 2863 // an error here 2864 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2865 Invalid = true; 2866 SC = SC_None; 2867 } 2868 SCSpec = DS.getStorageClassSpecAsWritten(); 2869 VarDecl::StorageClass SCAsWritten 2870 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2871 2872 Anon = VarDecl::Create(Context, Owner, 2873 DS.getSourceRange().getBegin(), 2874 Record->getLocation(), /*IdentifierInfo=*/0, 2875 Context.getTypeDeclType(Record), 2876 TInfo, SC, SCAsWritten); 2877 2878 // Default-initialize the implicit variable. This initialization will be 2879 // trivial in almost all cases, except if a union member has an in-class 2880 // initializer: 2881 // union { int n = 0; }; 2882 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2883 } 2884 Anon->setImplicit(); 2885 2886 // Add the anonymous struct/union object to the current 2887 // context. We'll be referencing this object when we refer to one of 2888 // its members. 2889 Owner->addDecl(Anon); 2890 2891 // Inject the members of the anonymous struct/union into the owning 2892 // context and into the identifier resolver chain for name lookup 2893 // purposes. 2894 SmallVector<NamedDecl*, 2> Chain; 2895 Chain.push_back(Anon); 2896 2897 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2898 Chain, false)) 2899 Invalid = true; 2900 2901 // Mark this as an anonymous struct/union type. Note that we do not 2902 // do this until after we have already checked and injected the 2903 // members of this anonymous struct/union type, because otherwise 2904 // the members could be injected twice: once by DeclContext when it 2905 // builds its lookup table, and once by 2906 // InjectAnonymousStructOrUnionMembers. 2907 Record->setAnonymousStructOrUnion(true); 2908 2909 if (Invalid) 2910 Anon->setInvalidDecl(); 2911 2912 return Anon; 2913} 2914 2915/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2916/// Microsoft C anonymous structure. 2917/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2918/// Example: 2919/// 2920/// struct A { int a; }; 2921/// struct B { struct A; int b; }; 2922/// 2923/// void foo() { 2924/// B var; 2925/// var.a = 3; 2926/// } 2927/// 2928Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2929 RecordDecl *Record) { 2930 2931 // If there is no Record, get the record via the typedef. 2932 if (!Record) 2933 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2934 2935 // Mock up a declarator. 2936 Declarator Dc(DS, Declarator::TypeNameContext); 2937 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2938 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2939 2940 // Create a declaration for this anonymous struct. 2941 NamedDecl* Anon = FieldDecl::Create(Context, 2942 cast<RecordDecl>(CurContext), 2943 DS.getSourceRange().getBegin(), 2944 DS.getSourceRange().getBegin(), 2945 /*IdentifierInfo=*/0, 2946 Context.getTypeDeclType(Record), 2947 TInfo, 2948 /*BitWidth=*/0, /*Mutable=*/false, 2949 /*HasInit=*/false); 2950 Anon->setImplicit(); 2951 2952 // Add the anonymous struct object to the current context. 2953 CurContext->addDecl(Anon); 2954 2955 // Inject the members of the anonymous struct into the current 2956 // context and into the identifier resolver chain for name lookup 2957 // purposes. 2958 SmallVector<NamedDecl*, 2> Chain; 2959 Chain.push_back(Anon); 2960 2961 RecordDecl *RecordDef = Record->getDefinition(); 2962 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2963 RecordDef, AS_none, 2964 Chain, true)) 2965 Anon->setInvalidDecl(); 2966 2967 return Anon; 2968} 2969 2970/// GetNameForDeclarator - Determine the full declaration name for the 2971/// given Declarator. 2972DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2973 return GetNameFromUnqualifiedId(D.getName()); 2974} 2975 2976/// \brief Retrieves the declaration name from a parsed unqualified-id. 2977DeclarationNameInfo 2978Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2979 DeclarationNameInfo NameInfo; 2980 NameInfo.setLoc(Name.StartLocation); 2981 2982 switch (Name.getKind()) { 2983 2984 case UnqualifiedId::IK_ImplicitSelfParam: 2985 case UnqualifiedId::IK_Identifier: 2986 NameInfo.setName(Name.Identifier); 2987 NameInfo.setLoc(Name.StartLocation); 2988 return NameInfo; 2989 2990 case UnqualifiedId::IK_OperatorFunctionId: 2991 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2992 Name.OperatorFunctionId.Operator)); 2993 NameInfo.setLoc(Name.StartLocation); 2994 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2995 = Name.OperatorFunctionId.SymbolLocations[0]; 2996 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2997 = Name.EndLocation.getRawEncoding(); 2998 return NameInfo; 2999 3000 case UnqualifiedId::IK_LiteralOperatorId: 3001 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 3002 Name.Identifier)); 3003 NameInfo.setLoc(Name.StartLocation); 3004 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3005 return NameInfo; 3006 3007 case UnqualifiedId::IK_ConversionFunctionId: { 3008 TypeSourceInfo *TInfo; 3009 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3010 if (Ty.isNull()) 3011 return DeclarationNameInfo(); 3012 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3013 Context.getCanonicalType(Ty))); 3014 NameInfo.setLoc(Name.StartLocation); 3015 NameInfo.setNamedTypeInfo(TInfo); 3016 return NameInfo; 3017 } 3018 3019 case UnqualifiedId::IK_ConstructorName: { 3020 TypeSourceInfo *TInfo; 3021 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3022 if (Ty.isNull()) 3023 return DeclarationNameInfo(); 3024 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3025 Context.getCanonicalType(Ty))); 3026 NameInfo.setLoc(Name.StartLocation); 3027 NameInfo.setNamedTypeInfo(TInfo); 3028 return NameInfo; 3029 } 3030 3031 case UnqualifiedId::IK_ConstructorTemplateId: { 3032 // In well-formed code, we can only have a constructor 3033 // template-id that refers to the current context, so go there 3034 // to find the actual type being constructed. 3035 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3036 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3037 return DeclarationNameInfo(); 3038 3039 // Determine the type of the class being constructed. 3040 QualType CurClassType = Context.getTypeDeclType(CurClass); 3041 3042 // FIXME: Check two things: that the template-id names the same type as 3043 // CurClassType, and that the template-id does not occur when the name 3044 // was qualified. 3045 3046 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3047 Context.getCanonicalType(CurClassType))); 3048 NameInfo.setLoc(Name.StartLocation); 3049 // FIXME: should we retrieve TypeSourceInfo? 3050 NameInfo.setNamedTypeInfo(0); 3051 return NameInfo; 3052 } 3053 3054 case UnqualifiedId::IK_DestructorName: { 3055 TypeSourceInfo *TInfo; 3056 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3057 if (Ty.isNull()) 3058 return DeclarationNameInfo(); 3059 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3060 Context.getCanonicalType(Ty))); 3061 NameInfo.setLoc(Name.StartLocation); 3062 NameInfo.setNamedTypeInfo(TInfo); 3063 return NameInfo; 3064 } 3065 3066 case UnqualifiedId::IK_TemplateId: { 3067 TemplateName TName = Name.TemplateId->Template.get(); 3068 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3069 return Context.getNameForTemplate(TName, TNameLoc); 3070 } 3071 3072 } // switch (Name.getKind()) 3073 3074 llvm_unreachable("Unknown name kind"); 3075} 3076 3077static QualType getCoreType(QualType Ty) { 3078 do { 3079 if (Ty->isPointerType() || Ty->isReferenceType()) 3080 Ty = Ty->getPointeeType(); 3081 else if (Ty->isArrayType()) 3082 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3083 else 3084 return Ty.withoutLocalFastQualifiers(); 3085 } while (true); 3086} 3087 3088/// hasSimilarParameters - Determine whether the C++ functions Declaration 3089/// and Definition have "nearly" matching parameters. This heuristic is 3090/// used to improve diagnostics in the case where an out-of-line function 3091/// definition doesn't match any declaration within the class or namespace. 3092/// Also sets Params to the list of indices to the parameters that differ 3093/// between the declaration and the definition. If hasSimilarParameters 3094/// returns true and Params is empty, then all of the parameters match. 3095static bool hasSimilarParameters(ASTContext &Context, 3096 FunctionDecl *Declaration, 3097 FunctionDecl *Definition, 3098 llvm::SmallVectorImpl<unsigned> &Params) { 3099 Params.clear(); 3100 if (Declaration->param_size() != Definition->param_size()) 3101 return false; 3102 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3103 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3104 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3105 3106 // The parameter types are identical 3107 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3108 continue; 3109 3110 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3111 QualType DefParamBaseTy = getCoreType(DefParamTy); 3112 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3113 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3114 3115 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3116 (DeclTyName && DeclTyName == DefTyName)) 3117 Params.push_back(Idx); 3118 else // The two parameters aren't even close 3119 return false; 3120 } 3121 3122 return true; 3123} 3124 3125/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3126/// declarator needs to be rebuilt in the current instantiation. 3127/// Any bits of declarator which appear before the name are valid for 3128/// consideration here. That's specifically the type in the decl spec 3129/// and the base type in any member-pointer chunks. 3130static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3131 DeclarationName Name) { 3132 // The types we specifically need to rebuild are: 3133 // - typenames, typeofs, and decltypes 3134 // - types which will become injected class names 3135 // Of course, we also need to rebuild any type referencing such a 3136 // type. It's safest to just say "dependent", but we call out a 3137 // few cases here. 3138 3139 DeclSpec &DS = D.getMutableDeclSpec(); 3140 switch (DS.getTypeSpecType()) { 3141 case DeclSpec::TST_typename: 3142 case DeclSpec::TST_typeofType: 3143 case DeclSpec::TST_decltype: 3144 case DeclSpec::TST_underlyingType: 3145 case DeclSpec::TST_atomic: { 3146 // Grab the type from the parser. 3147 TypeSourceInfo *TSI = 0; 3148 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3149 if (T.isNull() || !T->isDependentType()) break; 3150 3151 // Make sure there's a type source info. This isn't really much 3152 // of a waste; most dependent types should have type source info 3153 // attached already. 3154 if (!TSI) 3155 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3156 3157 // Rebuild the type in the current instantiation. 3158 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3159 if (!TSI) return true; 3160 3161 // Store the new type back in the decl spec. 3162 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3163 DS.UpdateTypeRep(LocType); 3164 break; 3165 } 3166 3167 case DeclSpec::TST_typeofExpr: { 3168 Expr *E = DS.getRepAsExpr(); 3169 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3170 if (Result.isInvalid()) return true; 3171 DS.UpdateExprRep(Result.get()); 3172 break; 3173 } 3174 3175 default: 3176 // Nothing to do for these decl specs. 3177 break; 3178 } 3179 3180 // It doesn't matter what order we do this in. 3181 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3182 DeclaratorChunk &Chunk = D.getTypeObject(I); 3183 3184 // The only type information in the declarator which can come 3185 // before the declaration name is the base type of a member 3186 // pointer. 3187 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3188 continue; 3189 3190 // Rebuild the scope specifier in-place. 3191 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3192 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3193 return true; 3194 } 3195 3196 return false; 3197} 3198 3199Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3200 D.setFunctionDefinitionKind(FDK_Declaration); 3201 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3202 3203 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3204 Dcl->getDeclContext()->isFileContext()) 3205 Dcl->setTopLevelDeclInObjCContainer(); 3206 3207 return Dcl; 3208} 3209 3210/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3211/// If T is the name of a class, then each of the following shall have a 3212/// name different from T: 3213/// - every static data member of class T; 3214/// - every member function of class T 3215/// - every member of class T that is itself a type; 3216/// \returns true if the declaration name violates these rules. 3217bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3218 DeclarationNameInfo NameInfo) { 3219 DeclarationName Name = NameInfo.getName(); 3220 3221 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3222 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3223 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3224 return true; 3225 } 3226 3227 return false; 3228} 3229 3230Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3231 MultiTemplateParamsArg TemplateParamLists) { 3232 // TODO: consider using NameInfo for diagnostic. 3233 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3234 DeclarationName Name = NameInfo.getName(); 3235 3236 // All of these full declarators require an identifier. If it doesn't have 3237 // one, the ParsedFreeStandingDeclSpec action should be used. 3238 if (!Name) { 3239 if (!D.isInvalidType()) // Reject this if we think it is valid. 3240 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3241 diag::err_declarator_need_ident) 3242 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3243 return 0; 3244 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3245 return 0; 3246 3247 // The scope passed in may not be a decl scope. Zip up the scope tree until 3248 // we find one that is. 3249 while ((S->getFlags() & Scope::DeclScope) == 0 || 3250 (S->getFlags() & Scope::TemplateParamScope) != 0) 3251 S = S->getParent(); 3252 3253 DeclContext *DC = CurContext; 3254 if (D.getCXXScopeSpec().isInvalid()) 3255 D.setInvalidType(); 3256 else if (D.getCXXScopeSpec().isSet()) { 3257 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3258 UPPC_DeclarationQualifier)) 3259 return 0; 3260 3261 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3262 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3263 if (!DC) { 3264 // If we could not compute the declaration context, it's because the 3265 // declaration context is dependent but does not refer to a class, 3266 // class template, or class template partial specialization. Complain 3267 // and return early, to avoid the coming semantic disaster. 3268 Diag(D.getIdentifierLoc(), 3269 diag::err_template_qualified_declarator_no_match) 3270 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3271 << D.getCXXScopeSpec().getRange(); 3272 return 0; 3273 } 3274 bool IsDependentContext = DC->isDependentContext(); 3275 3276 if (!IsDependentContext && 3277 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3278 return 0; 3279 3280 if (isa<CXXRecordDecl>(DC)) { 3281 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3282 Diag(D.getIdentifierLoc(), 3283 diag::err_member_def_undefined_record) 3284 << Name << DC << D.getCXXScopeSpec().getRange(); 3285 D.setInvalidType(); 3286 } else if (isa<CXXRecordDecl>(CurContext) && 3287 !D.getDeclSpec().isFriendSpecified()) { 3288 // The user provided a superfluous scope specifier inside a class 3289 // definition: 3290 // 3291 // class X { 3292 // void X::f(); 3293 // }; 3294 if (CurContext->Equals(DC)) { 3295 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3296 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3297 } else { 3298 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3299 << Name << D.getCXXScopeSpec().getRange(); 3300 3301 // C++ constructors and destructors with incorrect scopes can break 3302 // our AST invariants by having the wrong underlying types. If 3303 // that's the case, then drop this declaration entirely. 3304 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3305 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3306 !Context.hasSameType(Name.getCXXNameType(), 3307 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3308 return 0; 3309 } 3310 3311 // Pretend that this qualifier was not here. 3312 D.getCXXScopeSpec().clear(); 3313 } 3314 } 3315 3316 // Check whether we need to rebuild the type of the given 3317 // declaration in the current instantiation. 3318 if (EnteringContext && IsDependentContext && 3319 TemplateParamLists.size() != 0) { 3320 ContextRAII SavedContext(*this, DC); 3321 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3322 D.setInvalidType(); 3323 } 3324 } 3325 3326 if (DiagnoseClassNameShadow(DC, NameInfo)) 3327 // If this is a typedef, we'll end up spewing multiple diagnostics. 3328 // Just return early; it's safer. 3329 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3330 return 0; 3331 3332 NamedDecl *New; 3333 3334 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3335 QualType R = TInfo->getType(); 3336 3337 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3338 UPPC_DeclarationType)) 3339 D.setInvalidType(); 3340 3341 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3342 ForRedeclaration); 3343 3344 // See if this is a redefinition of a variable in the same scope. 3345 if (!D.getCXXScopeSpec().isSet()) { 3346 bool IsLinkageLookup = false; 3347 3348 // If the declaration we're planning to build will be a function 3349 // or object with linkage, then look for another declaration with 3350 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3351 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3352 /* Do nothing*/; 3353 else if (R->isFunctionType()) { 3354 if (CurContext->isFunctionOrMethod() || 3355 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3356 IsLinkageLookup = true; 3357 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3358 IsLinkageLookup = true; 3359 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3360 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3361 IsLinkageLookup = true; 3362 3363 if (IsLinkageLookup) 3364 Previous.clear(LookupRedeclarationWithLinkage); 3365 3366 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3367 } else { // Something like "int foo::x;" 3368 LookupQualifiedName(Previous, DC); 3369 3370 // Don't consider using declarations as previous declarations for 3371 // out-of-line members. 3372 RemoveUsingDecls(Previous); 3373 3374 // C++ 7.3.1.2p2: 3375 // Members (including explicit specializations of templates) of a named 3376 // namespace can also be defined outside that namespace by explicit 3377 // qualification of the name being defined, provided that the entity being 3378 // defined was already declared in the namespace and the definition appears 3379 // after the point of declaration in a namespace that encloses the 3380 // declarations namespace. 3381 // 3382 // Note that we only check the context at this point. We don't yet 3383 // have enough information to make sure that PrevDecl is actually 3384 // the declaration we want to match. For example, given: 3385 // 3386 // class X { 3387 // void f(); 3388 // void f(float); 3389 // }; 3390 // 3391 // void X::f(int) { } // ill-formed 3392 // 3393 // In this case, PrevDecl will point to the overload set 3394 // containing the two f's declared in X, but neither of them 3395 // matches. 3396 3397 // First check whether we named the global scope. 3398 if (isa<TranslationUnitDecl>(DC)) { 3399 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3400 << Name << D.getCXXScopeSpec().getRange(); 3401 } else { 3402 DeclContext *Cur = CurContext; 3403 while (isa<LinkageSpecDecl>(Cur)) 3404 Cur = Cur->getParent(); 3405 if (!Cur->Encloses(DC)) { 3406 // The qualifying scope doesn't enclose the original declaration. 3407 // Emit diagnostic based on current scope. 3408 SourceLocation L = D.getIdentifierLoc(); 3409 SourceRange R = D.getCXXScopeSpec().getRange(); 3410 if (isa<FunctionDecl>(Cur)) 3411 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3412 else 3413 Diag(L, diag::err_invalid_declarator_scope) 3414 << Name << cast<NamedDecl>(DC) << R; 3415 D.setInvalidType(); 3416 } 3417 3418 // C++11 8.3p1: 3419 // ... "The nested-name-specifier of the qualified declarator-id shall 3420 // not begin with a decltype-specifer" 3421 NestedNameSpecifierLoc SpecLoc = 3422 D.getCXXScopeSpec().getWithLocInContext(Context); 3423 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3424 "NestedNameSpecifierLoc"); 3425 while (SpecLoc.getPrefix()) 3426 SpecLoc = SpecLoc.getPrefix(); 3427 if (dyn_cast_or_null<DecltypeType>( 3428 SpecLoc.getNestedNameSpecifier()->getAsType())) 3429 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3430 << SpecLoc.getTypeLoc().getSourceRange(); 3431 } 3432 } 3433 3434 if (Previous.isSingleResult() && 3435 Previous.getFoundDecl()->isTemplateParameter()) { 3436 // Maybe we will complain about the shadowed template parameter. 3437 if (!D.isInvalidType()) 3438 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3439 Previous.getFoundDecl()); 3440 3441 // Just pretend that we didn't see the previous declaration. 3442 Previous.clear(); 3443 } 3444 3445 // In C++, the previous declaration we find might be a tag type 3446 // (class or enum). In this case, the new declaration will hide the 3447 // tag type. Note that this does does not apply if we're declaring a 3448 // typedef (C++ [dcl.typedef]p4). 3449 if (Previous.isSingleTagDecl() && 3450 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3451 Previous.clear(); 3452 3453 bool AddToScope = true; 3454 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3455 if (TemplateParamLists.size()) { 3456 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3457 return 0; 3458 } 3459 3460 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3461 } else if (R->isFunctionType()) { 3462 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3463 move(TemplateParamLists), 3464 AddToScope); 3465 } else { 3466 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3467 move(TemplateParamLists)); 3468 } 3469 3470 if (New == 0) 3471 return 0; 3472 3473 // If this has an identifier and is not an invalid redeclaration or 3474 // function template specialization, add it to the scope stack. 3475 if (New->getDeclName() && AddToScope && 3476 !(D.isRedeclaration() && New->isInvalidDecl())) 3477 PushOnScopeChains(New, S); 3478 3479 return New; 3480} 3481 3482/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3483/// types into constant array types in certain situations which would otherwise 3484/// be errors (for GCC compatibility). 3485static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3486 ASTContext &Context, 3487 bool &SizeIsNegative, 3488 llvm::APSInt &Oversized) { 3489 // This method tries to turn a variable array into a constant 3490 // array even when the size isn't an ICE. This is necessary 3491 // for compatibility with code that depends on gcc's buggy 3492 // constant expression folding, like struct {char x[(int)(char*)2];} 3493 SizeIsNegative = false; 3494 Oversized = 0; 3495 3496 if (T->isDependentType()) 3497 return QualType(); 3498 3499 QualifierCollector Qs; 3500 const Type *Ty = Qs.strip(T); 3501 3502 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3503 QualType Pointee = PTy->getPointeeType(); 3504 QualType FixedType = 3505 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3506 Oversized); 3507 if (FixedType.isNull()) return FixedType; 3508 FixedType = Context.getPointerType(FixedType); 3509 return Qs.apply(Context, FixedType); 3510 } 3511 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3512 QualType Inner = PTy->getInnerType(); 3513 QualType FixedType = 3514 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3515 Oversized); 3516 if (FixedType.isNull()) return FixedType; 3517 FixedType = Context.getParenType(FixedType); 3518 return Qs.apply(Context, FixedType); 3519 } 3520 3521 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3522 if (!VLATy) 3523 return QualType(); 3524 // FIXME: We should probably handle this case 3525 if (VLATy->getElementType()->isVariablyModifiedType()) 3526 return QualType(); 3527 3528 llvm::APSInt Res; 3529 if (!VLATy->getSizeExpr() || 3530 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3531 return QualType(); 3532 3533 // Check whether the array size is negative. 3534 if (Res.isSigned() && Res.isNegative()) { 3535 SizeIsNegative = true; 3536 return QualType(); 3537 } 3538 3539 // Check whether the array is too large to be addressed. 3540 unsigned ActiveSizeBits 3541 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3542 Res); 3543 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3544 Oversized = Res; 3545 return QualType(); 3546 } 3547 3548 return Context.getConstantArrayType(VLATy->getElementType(), 3549 Res, ArrayType::Normal, 0); 3550} 3551 3552/// \brief Register the given locally-scoped external C declaration so 3553/// that it can be found later for redeclarations 3554void 3555Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3556 const LookupResult &Previous, 3557 Scope *S) { 3558 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3559 "Decl is not a locally-scoped decl!"); 3560 // Note that we have a locally-scoped external with this name. 3561 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3562 3563 if (!Previous.isSingleResult()) 3564 return; 3565 3566 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3567 3568 // If there was a previous declaration of this variable, it may be 3569 // in our identifier chain. Update the identifier chain with the new 3570 // declaration. 3571 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3572 // The previous declaration was found on the identifer resolver 3573 // chain, so remove it from its scope. 3574 3575 if (S->isDeclScope(PrevDecl)) { 3576 // Special case for redeclarations in the SAME scope. 3577 // Because this declaration is going to be added to the identifier chain 3578 // later, we should temporarily take it OFF the chain. 3579 IdResolver.RemoveDecl(ND); 3580 3581 } else { 3582 // Find the scope for the original declaration. 3583 while (S && !S->isDeclScope(PrevDecl)) 3584 S = S->getParent(); 3585 } 3586 3587 if (S) 3588 S->RemoveDecl(PrevDecl); 3589 } 3590} 3591 3592llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3593Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3594 if (ExternalSource) { 3595 // Load locally-scoped external decls from the external source. 3596 SmallVector<NamedDecl *, 4> Decls; 3597 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3598 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3599 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3600 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3601 if (Pos == LocallyScopedExternalDecls.end()) 3602 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3603 } 3604 } 3605 3606 return LocallyScopedExternalDecls.find(Name); 3607} 3608 3609/// \brief Diagnose function specifiers on a declaration of an identifier that 3610/// does not identify a function. 3611void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3612 // FIXME: We should probably indicate the identifier in question to avoid 3613 // confusion for constructs like "inline int a(), b;" 3614 if (D.getDeclSpec().isInlineSpecified()) 3615 Diag(D.getDeclSpec().getInlineSpecLoc(), 3616 diag::err_inline_non_function); 3617 3618 if (D.getDeclSpec().isVirtualSpecified()) 3619 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3620 diag::err_virtual_non_function); 3621 3622 if (D.getDeclSpec().isExplicitSpecified()) 3623 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3624 diag::err_explicit_non_function); 3625} 3626 3627NamedDecl* 3628Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3629 TypeSourceInfo *TInfo, LookupResult &Previous) { 3630 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3631 if (D.getCXXScopeSpec().isSet()) { 3632 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3633 << D.getCXXScopeSpec().getRange(); 3634 D.setInvalidType(); 3635 // Pretend we didn't see the scope specifier. 3636 DC = CurContext; 3637 Previous.clear(); 3638 } 3639 3640 if (getLangOptions().CPlusPlus) { 3641 // Check that there are no default arguments (C++ only). 3642 CheckExtraCXXDefaultArguments(D); 3643 } 3644 3645 DiagnoseFunctionSpecifiers(D); 3646 3647 if (D.getDeclSpec().isThreadSpecified()) 3648 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3649 if (D.getDeclSpec().isConstexprSpecified()) 3650 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3651 << 1; 3652 3653 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3654 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3655 << D.getName().getSourceRange(); 3656 return 0; 3657 } 3658 3659 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3660 if (!NewTD) return 0; 3661 3662 // Handle attributes prior to checking for duplicates in MergeVarDecl 3663 ProcessDeclAttributes(S, NewTD, D); 3664 3665 CheckTypedefForVariablyModifiedType(S, NewTD); 3666 3667 bool Redeclaration = D.isRedeclaration(); 3668 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3669 D.setRedeclaration(Redeclaration); 3670 return ND; 3671} 3672 3673void 3674Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3675 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3676 // then it shall have block scope. 3677 // Note that variably modified types must be fixed before merging the decl so 3678 // that redeclarations will match. 3679 QualType T = NewTD->getUnderlyingType(); 3680 if (T->isVariablyModifiedType()) { 3681 getCurFunction()->setHasBranchProtectedScope(); 3682 3683 if (S->getFnParent() == 0) { 3684 bool SizeIsNegative; 3685 llvm::APSInt Oversized; 3686 QualType FixedTy = 3687 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3688 Oversized); 3689 if (!FixedTy.isNull()) { 3690 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3691 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3692 } else { 3693 if (SizeIsNegative) 3694 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3695 else if (T->isVariableArrayType()) 3696 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3697 else if (Oversized.getBoolValue()) 3698 Diag(NewTD->getLocation(), diag::err_array_too_large) 3699 << Oversized.toString(10); 3700 else 3701 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3702 NewTD->setInvalidDecl(); 3703 } 3704 } 3705 } 3706} 3707 3708 3709/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3710/// declares a typedef-name, either using the 'typedef' type specifier or via 3711/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3712NamedDecl* 3713Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3714 LookupResult &Previous, bool &Redeclaration) { 3715 // Merge the decl with the existing one if appropriate. If the decl is 3716 // in an outer scope, it isn't the same thing. 3717 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3718 /*ExplicitInstantiationOrSpecialization=*/false); 3719 if (!Previous.empty()) { 3720 Redeclaration = true; 3721 MergeTypedefNameDecl(NewTD, Previous); 3722 } 3723 3724 // If this is the C FILE type, notify the AST context. 3725 if (IdentifierInfo *II = NewTD->getIdentifier()) 3726 if (!NewTD->isInvalidDecl() && 3727 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3728 if (II->isStr("FILE")) 3729 Context.setFILEDecl(NewTD); 3730 else if (II->isStr("jmp_buf")) 3731 Context.setjmp_bufDecl(NewTD); 3732 else if (II->isStr("sigjmp_buf")) 3733 Context.setsigjmp_bufDecl(NewTD); 3734 else if (II->isStr("ucontext_t")) 3735 Context.setucontext_tDecl(NewTD); 3736 else if (II->isStr("__builtin_va_list")) 3737 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3738 } 3739 3740 return NewTD; 3741} 3742 3743/// \brief Determines whether the given declaration is an out-of-scope 3744/// previous declaration. 3745/// 3746/// This routine should be invoked when name lookup has found a 3747/// previous declaration (PrevDecl) that is not in the scope where a 3748/// new declaration by the same name is being introduced. If the new 3749/// declaration occurs in a local scope, previous declarations with 3750/// linkage may still be considered previous declarations (C99 3751/// 6.2.2p4-5, C++ [basic.link]p6). 3752/// 3753/// \param PrevDecl the previous declaration found by name 3754/// lookup 3755/// 3756/// \param DC the context in which the new declaration is being 3757/// declared. 3758/// 3759/// \returns true if PrevDecl is an out-of-scope previous declaration 3760/// for a new delcaration with the same name. 3761static bool 3762isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3763 ASTContext &Context) { 3764 if (!PrevDecl) 3765 return false; 3766 3767 if (!PrevDecl->hasLinkage()) 3768 return false; 3769 3770 if (Context.getLangOptions().CPlusPlus) { 3771 // C++ [basic.link]p6: 3772 // If there is a visible declaration of an entity with linkage 3773 // having the same name and type, ignoring entities declared 3774 // outside the innermost enclosing namespace scope, the block 3775 // scope declaration declares that same entity and receives the 3776 // linkage of the previous declaration. 3777 DeclContext *OuterContext = DC->getRedeclContext(); 3778 if (!OuterContext->isFunctionOrMethod()) 3779 // This rule only applies to block-scope declarations. 3780 return false; 3781 3782 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3783 if (PrevOuterContext->isRecord()) 3784 // We found a member function: ignore it. 3785 return false; 3786 3787 // Find the innermost enclosing namespace for the new and 3788 // previous declarations. 3789 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3790 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3791 3792 // The previous declaration is in a different namespace, so it 3793 // isn't the same function. 3794 if (!OuterContext->Equals(PrevOuterContext)) 3795 return false; 3796 } 3797 3798 return true; 3799} 3800 3801static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3802 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3803 if (!SS.isSet()) return; 3804 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3805} 3806 3807bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3808 QualType type = decl->getType(); 3809 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3810 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3811 // Various kinds of declaration aren't allowed to be __autoreleasing. 3812 unsigned kind = -1U; 3813 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3814 if (var->hasAttr<BlocksAttr>()) 3815 kind = 0; // __block 3816 else if (!var->hasLocalStorage()) 3817 kind = 1; // global 3818 } else if (isa<ObjCIvarDecl>(decl)) { 3819 kind = 3; // ivar 3820 } else if (isa<FieldDecl>(decl)) { 3821 kind = 2; // field 3822 } 3823 3824 if (kind != -1U) { 3825 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3826 << kind; 3827 } 3828 } else if (lifetime == Qualifiers::OCL_None) { 3829 // Try to infer lifetime. 3830 if (!type->isObjCLifetimeType()) 3831 return false; 3832 3833 lifetime = type->getObjCARCImplicitLifetime(); 3834 type = Context.getLifetimeQualifiedType(type, lifetime); 3835 decl->setType(type); 3836 } 3837 3838 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3839 // Thread-local variables cannot have lifetime. 3840 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3841 var->isThreadSpecified()) { 3842 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3843 << var->getType(); 3844 return true; 3845 } 3846 } 3847 3848 return false; 3849} 3850 3851NamedDecl* 3852Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3853 TypeSourceInfo *TInfo, LookupResult &Previous, 3854 MultiTemplateParamsArg TemplateParamLists) { 3855 QualType R = TInfo->getType(); 3856 DeclarationName Name = GetNameForDeclarator(D).getName(); 3857 3858 // Check that there are no default arguments (C++ only). 3859 if (getLangOptions().CPlusPlus) 3860 CheckExtraCXXDefaultArguments(D); 3861 3862 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3863 assert(SCSpec != DeclSpec::SCS_typedef && 3864 "Parser allowed 'typedef' as storage class VarDecl."); 3865 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3866 if (SCSpec == DeclSpec::SCS_mutable) { 3867 // mutable can only appear on non-static class members, so it's always 3868 // an error here 3869 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3870 D.setInvalidType(); 3871 SC = SC_None; 3872 } 3873 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3874 VarDecl::StorageClass SCAsWritten 3875 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3876 3877 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3878 if (!II) { 3879 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3880 << Name; 3881 return 0; 3882 } 3883 3884 DiagnoseFunctionSpecifiers(D); 3885 3886 if (!DC->isRecord() && S->getFnParent() == 0) { 3887 // C99 6.9p2: The storage-class specifiers auto and register shall not 3888 // appear in the declaration specifiers in an external declaration. 3889 if (SC == SC_Auto || SC == SC_Register) { 3890 3891 // If this is a register variable with an asm label specified, then this 3892 // is a GNU extension. 3893 if (SC == SC_Register && D.getAsmLabel()) 3894 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3895 else 3896 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3897 D.setInvalidType(); 3898 } 3899 } 3900 3901 if (getLangOptions().OpenCL) { 3902 // Set up the special work-group-local storage class for variables in the 3903 // OpenCL __local address space. 3904 if (R.getAddressSpace() == LangAS::opencl_local) 3905 SC = SC_OpenCLWorkGroupLocal; 3906 } 3907 3908 bool isExplicitSpecialization = false; 3909 VarDecl *NewVD; 3910 if (!getLangOptions().CPlusPlus) { 3911 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3912 D.getIdentifierLoc(), II, 3913 R, TInfo, SC, SCAsWritten); 3914 3915 if (D.isInvalidType()) 3916 NewVD->setInvalidDecl(); 3917 } else { 3918 if (DC->isRecord() && !CurContext->isRecord()) { 3919 // This is an out-of-line definition of a static data member. 3920 if (SC == SC_Static) { 3921 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3922 diag::err_static_out_of_line) 3923 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3924 } else if (SC == SC_None) 3925 SC = SC_Static; 3926 } 3927 if (SC == SC_Static && CurContext->isRecord()) { 3928 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3929 if (RD->isLocalClass()) 3930 Diag(D.getIdentifierLoc(), 3931 diag::err_static_data_member_not_allowed_in_local_class) 3932 << Name << RD->getDeclName(); 3933 3934 // C++98 [class.union]p1: If a union contains a static data member, 3935 // the program is ill-formed. C++11 drops this restriction. 3936 if (RD->isUnion()) 3937 Diag(D.getIdentifierLoc(), 3938 getLangOptions().CPlusPlus0x 3939 ? diag::warn_cxx98_compat_static_data_member_in_union 3940 : diag::ext_static_data_member_in_union) << Name; 3941 // We conservatively disallow static data members in anonymous structs. 3942 else if (!RD->getDeclName()) 3943 Diag(D.getIdentifierLoc(), 3944 diag::err_static_data_member_not_allowed_in_anon_struct) 3945 << Name << RD->isUnion(); 3946 } 3947 } 3948 3949 // Match up the template parameter lists with the scope specifier, then 3950 // determine whether we have a template or a template specialization. 3951 isExplicitSpecialization = false; 3952 bool Invalid = false; 3953 if (TemplateParameterList *TemplateParams 3954 = MatchTemplateParametersToScopeSpecifier( 3955 D.getDeclSpec().getSourceRange().getBegin(), 3956 D.getIdentifierLoc(), 3957 D.getCXXScopeSpec(), 3958 TemplateParamLists.get(), 3959 TemplateParamLists.size(), 3960 /*never a friend*/ false, 3961 isExplicitSpecialization, 3962 Invalid)) { 3963 if (TemplateParams->size() > 0) { 3964 // There is no such thing as a variable template. 3965 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3966 << II 3967 << SourceRange(TemplateParams->getTemplateLoc(), 3968 TemplateParams->getRAngleLoc()); 3969 return 0; 3970 } else { 3971 // There is an extraneous 'template<>' for this variable. Complain 3972 // about it, but allow the declaration of the variable. 3973 Diag(TemplateParams->getTemplateLoc(), 3974 diag::err_template_variable_noparams) 3975 << II 3976 << SourceRange(TemplateParams->getTemplateLoc(), 3977 TemplateParams->getRAngleLoc()); 3978 } 3979 } 3980 3981 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3982 D.getIdentifierLoc(), II, 3983 R, TInfo, SC, SCAsWritten); 3984 3985 // If this decl has an auto type in need of deduction, make a note of the 3986 // Decl so we can diagnose uses of it in its own initializer. 3987 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3988 R->getContainedAutoType()) 3989 ParsingInitForAutoVars.insert(NewVD); 3990 3991 if (D.isInvalidType() || Invalid) 3992 NewVD->setInvalidDecl(); 3993 3994 SetNestedNameSpecifier(NewVD, D); 3995 3996 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3997 NewVD->setTemplateParameterListsInfo(Context, 3998 TemplateParamLists.size(), 3999 TemplateParamLists.release()); 4000 } 4001 4002 if (D.getDeclSpec().isConstexprSpecified()) 4003 NewVD->setConstexpr(true); 4004 } 4005 4006 // Set the lexical context. If the declarator has a C++ scope specifier, the 4007 // lexical context will be different from the semantic context. 4008 NewVD->setLexicalDeclContext(CurContext); 4009 4010 if (D.getDeclSpec().isThreadSpecified()) { 4011 if (NewVD->hasLocalStorage()) 4012 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4013 else if (!Context.getTargetInfo().isTLSSupported()) 4014 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4015 else 4016 NewVD->setThreadSpecified(true); 4017 } 4018 4019 if (D.getDeclSpec().isModulePrivateSpecified()) { 4020 if (isExplicitSpecialization) 4021 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4022 << 2 4023 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4024 else if (NewVD->hasLocalStorage()) 4025 Diag(NewVD->getLocation(), diag::err_module_private_local) 4026 << 0 << NewVD->getDeclName() 4027 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4028 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4029 else 4030 NewVD->setModulePrivate(); 4031 } 4032 4033 // Handle attributes prior to checking for duplicates in MergeVarDecl 4034 ProcessDeclAttributes(S, NewVD, D); 4035 4036 // In auto-retain/release, infer strong retension for variables of 4037 // retainable type. 4038 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4039 NewVD->setInvalidDecl(); 4040 4041 // Handle GNU asm-label extension (encoded as an attribute). 4042 if (Expr *E = (Expr*)D.getAsmLabel()) { 4043 // The parser guarantees this is a string. 4044 StringLiteral *SE = cast<StringLiteral>(E); 4045 StringRef Label = SE->getString(); 4046 if (S->getFnParent() != 0) { 4047 switch (SC) { 4048 case SC_None: 4049 case SC_Auto: 4050 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4051 break; 4052 case SC_Register: 4053 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4054 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4055 break; 4056 case SC_Static: 4057 case SC_Extern: 4058 case SC_PrivateExtern: 4059 case SC_OpenCLWorkGroupLocal: 4060 break; 4061 } 4062 } 4063 4064 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4065 Context, Label)); 4066 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 4067 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 4068 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier()); 4069 if (I != ExtnameUndeclaredIdentifiers.end()) { 4070 NewVD->addAttr(I->second); 4071 ExtnameUndeclaredIdentifiers.erase(I); 4072 } 4073 } 4074 4075 // Diagnose shadowed variables before filtering for scope. 4076 if (!D.getCXXScopeSpec().isSet()) 4077 CheckShadow(S, NewVD, Previous); 4078 4079 // Don't consider existing declarations that are in a different 4080 // scope and are out-of-semantic-context declarations (if the new 4081 // declaration has linkage). 4082 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4083 isExplicitSpecialization); 4084 4085 if (!getLangOptions().CPlusPlus) { 4086 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4087 } else { 4088 // Merge the decl with the existing one if appropriate. 4089 if (!Previous.empty()) { 4090 if (Previous.isSingleResult() && 4091 isa<FieldDecl>(Previous.getFoundDecl()) && 4092 D.getCXXScopeSpec().isSet()) { 4093 // The user tried to define a non-static data member 4094 // out-of-line (C++ [dcl.meaning]p1). 4095 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4096 << D.getCXXScopeSpec().getRange(); 4097 Previous.clear(); 4098 NewVD->setInvalidDecl(); 4099 } 4100 } else if (D.getCXXScopeSpec().isSet()) { 4101 // No previous declaration in the qualifying scope. 4102 Diag(D.getIdentifierLoc(), diag::err_no_member) 4103 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4104 << D.getCXXScopeSpec().getRange(); 4105 NewVD->setInvalidDecl(); 4106 } 4107 4108 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4109 4110 // This is an explicit specialization of a static data member. Check it. 4111 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4112 CheckMemberSpecialization(NewVD, Previous)) 4113 NewVD->setInvalidDecl(); 4114 } 4115 4116 // attributes declared post-definition are currently ignored 4117 // FIXME: This should be handled in attribute merging, not 4118 // here. 4119 if (Previous.isSingleResult()) { 4120 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4121 if (Def && (Def = Def->getDefinition()) && 4122 Def != NewVD && D.hasAttributes()) { 4123 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4124 Diag(Def->getLocation(), diag::note_previous_definition); 4125 } 4126 } 4127 4128 // If this is a locally-scoped extern C variable, update the map of 4129 // such variables. 4130 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4131 !NewVD->isInvalidDecl()) 4132 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4133 4134 // If there's a #pragma GCC visibility in scope, and this isn't a class 4135 // member, set the visibility of this variable. 4136 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4137 AddPushedVisibilityAttribute(NewVD); 4138 4139 MarkUnusedFileScopedDecl(NewVD); 4140 4141 return NewVD; 4142} 4143 4144/// \brief Diagnose variable or built-in function shadowing. Implements 4145/// -Wshadow. 4146/// 4147/// This method is called whenever a VarDecl is added to a "useful" 4148/// scope. 4149/// 4150/// \param S the scope in which the shadowing name is being declared 4151/// \param R the lookup of the name 4152/// 4153void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4154 // Return if warning is ignored. 4155 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4156 DiagnosticsEngine::Ignored) 4157 return; 4158 4159 // Don't diagnose declarations at file scope. 4160 if (D->hasGlobalStorage()) 4161 return; 4162 4163 DeclContext *NewDC = D->getDeclContext(); 4164 4165 // Only diagnose if we're shadowing an unambiguous field or variable. 4166 if (R.getResultKind() != LookupResult::Found) 4167 return; 4168 4169 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4170 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4171 return; 4172 4173 // Fields are not shadowed by variables in C++ static methods. 4174 if (isa<FieldDecl>(ShadowedDecl)) 4175 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4176 if (MD->isStatic()) 4177 return; 4178 4179 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4180 if (shadowedVar->isExternC()) { 4181 // For shadowing external vars, make sure that we point to the global 4182 // declaration, not a locally scoped extern declaration. 4183 for (VarDecl::redecl_iterator 4184 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4185 I != E; ++I) 4186 if (I->isFileVarDecl()) { 4187 ShadowedDecl = *I; 4188 break; 4189 } 4190 } 4191 4192 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4193 4194 // Only warn about certain kinds of shadowing for class members. 4195 if (NewDC && NewDC->isRecord()) { 4196 // In particular, don't warn about shadowing non-class members. 4197 if (!OldDC->isRecord()) 4198 return; 4199 4200 // TODO: should we warn about static data members shadowing 4201 // static data members from base classes? 4202 4203 // TODO: don't diagnose for inaccessible shadowed members. 4204 // This is hard to do perfectly because we might friend the 4205 // shadowing context, but that's just a false negative. 4206 } 4207 4208 // Determine what kind of declaration we're shadowing. 4209 unsigned Kind; 4210 if (isa<RecordDecl>(OldDC)) { 4211 if (isa<FieldDecl>(ShadowedDecl)) 4212 Kind = 3; // field 4213 else 4214 Kind = 2; // static data member 4215 } else if (OldDC->isFileContext()) 4216 Kind = 1; // global 4217 else 4218 Kind = 0; // local 4219 4220 DeclarationName Name = R.getLookupName(); 4221 4222 // Emit warning and note. 4223 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4224 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4225} 4226 4227/// \brief Check -Wshadow without the advantage of a previous lookup. 4228void Sema::CheckShadow(Scope *S, VarDecl *D) { 4229 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4230 DiagnosticsEngine::Ignored) 4231 return; 4232 4233 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4234 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4235 LookupName(R, S); 4236 CheckShadow(S, D, R); 4237} 4238 4239/// \brief Perform semantic checking on a newly-created variable 4240/// declaration. 4241/// 4242/// This routine performs all of the type-checking required for a 4243/// variable declaration once it has been built. It is used both to 4244/// check variables after they have been parsed and their declarators 4245/// have been translated into a declaration, and to check variables 4246/// that have been instantiated from a template. 4247/// 4248/// Sets NewVD->isInvalidDecl() if an error was encountered. 4249/// 4250/// Returns true if the variable declaration is a redeclaration. 4251bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4252 LookupResult &Previous) { 4253 // If the decl is already known invalid, don't check it. 4254 if (NewVD->isInvalidDecl()) 4255 return false; 4256 4257 QualType T = NewVD->getType(); 4258 4259 if (T->isObjCObjectType()) { 4260 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4261 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4262 T = Context.getObjCObjectPointerType(T); 4263 NewVD->setType(T); 4264 } 4265 4266 // Emit an error if an address space was applied to decl with local storage. 4267 // This includes arrays of objects with address space qualifiers, but not 4268 // automatic variables that point to other address spaces. 4269 // ISO/IEC TR 18037 S5.1.2 4270 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4271 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4272 NewVD->setInvalidDecl(); 4273 return false; 4274 } 4275 4276 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4277 && !NewVD->hasAttr<BlocksAttr>()) { 4278 if (getLangOptions().getGC() != LangOptions::NonGC) 4279 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4280 else 4281 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4282 } 4283 4284 bool isVM = T->isVariablyModifiedType(); 4285 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4286 NewVD->hasAttr<BlocksAttr>()) 4287 getCurFunction()->setHasBranchProtectedScope(); 4288 4289 if ((isVM && NewVD->hasLinkage()) || 4290 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4291 bool SizeIsNegative; 4292 llvm::APSInt Oversized; 4293 QualType FixedTy = 4294 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4295 Oversized); 4296 4297 if (FixedTy.isNull() && T->isVariableArrayType()) { 4298 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4299 // FIXME: This won't give the correct result for 4300 // int a[10][n]; 4301 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4302 4303 if (NewVD->isFileVarDecl()) 4304 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4305 << SizeRange; 4306 else if (NewVD->getStorageClass() == SC_Static) 4307 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4308 << SizeRange; 4309 else 4310 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4311 << SizeRange; 4312 NewVD->setInvalidDecl(); 4313 return false; 4314 } 4315 4316 if (FixedTy.isNull()) { 4317 if (NewVD->isFileVarDecl()) 4318 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4319 else 4320 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4321 NewVD->setInvalidDecl(); 4322 return false; 4323 } 4324 4325 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4326 NewVD->setType(FixedTy); 4327 } 4328 4329 if (Previous.empty() && NewVD->isExternC()) { 4330 // Since we did not find anything by this name and we're declaring 4331 // an extern "C" variable, look for a non-visible extern "C" 4332 // declaration with the same name. 4333 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4334 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4335 if (Pos != LocallyScopedExternalDecls.end()) 4336 Previous.addDecl(Pos->second); 4337 } 4338 4339 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4340 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4341 << T; 4342 NewVD->setInvalidDecl(); 4343 return false; 4344 } 4345 4346 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4347 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4348 NewVD->setInvalidDecl(); 4349 return false; 4350 } 4351 4352 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4353 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4354 NewVD->setInvalidDecl(); 4355 return false; 4356 } 4357 4358 if (NewVD->isConstexpr() && !T->isDependentType() && 4359 RequireLiteralType(NewVD->getLocation(), T, 4360 PDiag(diag::err_constexpr_var_non_literal))) { 4361 NewVD->setInvalidDecl(); 4362 return false; 4363 } 4364 4365 if (!Previous.empty()) { 4366 MergeVarDecl(NewVD, Previous); 4367 return true; 4368 } 4369 return false; 4370} 4371 4372/// \brief Data used with FindOverriddenMethod 4373struct FindOverriddenMethodData { 4374 Sema *S; 4375 CXXMethodDecl *Method; 4376}; 4377 4378/// \brief Member lookup function that determines whether a given C++ 4379/// method overrides a method in a base class, to be used with 4380/// CXXRecordDecl::lookupInBases(). 4381static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4382 CXXBasePath &Path, 4383 void *UserData) { 4384 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4385 4386 FindOverriddenMethodData *Data 4387 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4388 4389 DeclarationName Name = Data->Method->getDeclName(); 4390 4391 // FIXME: Do we care about other names here too? 4392 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4393 // We really want to find the base class destructor here. 4394 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4395 CanQualType CT = Data->S->Context.getCanonicalType(T); 4396 4397 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4398 } 4399 4400 for (Path.Decls = BaseRecord->lookup(Name); 4401 Path.Decls.first != Path.Decls.second; 4402 ++Path.Decls.first) { 4403 NamedDecl *D = *Path.Decls.first; 4404 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4405 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4406 return true; 4407 } 4408 } 4409 4410 return false; 4411} 4412 4413/// AddOverriddenMethods - See if a method overrides any in the base classes, 4414/// and if so, check that it's a valid override and remember it. 4415bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4416 // Look for virtual methods in base classes that this method might override. 4417 CXXBasePaths Paths; 4418 FindOverriddenMethodData Data; 4419 Data.Method = MD; 4420 Data.S = this; 4421 bool AddedAny = false; 4422 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4423 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4424 E = Paths.found_decls_end(); I != E; ++I) { 4425 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4426 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4427 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4428 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4429 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4430 AddedAny = true; 4431 } 4432 } 4433 } 4434 } 4435 4436 return AddedAny; 4437} 4438 4439namespace { 4440 // Struct for holding all of the extra arguments needed by 4441 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4442 struct ActOnFDArgs { 4443 Scope *S; 4444 Declarator &D; 4445 MultiTemplateParamsArg TemplateParamLists; 4446 bool AddToScope; 4447 }; 4448} 4449 4450namespace { 4451 4452// Callback to only accept typo corrections that have a non-zero edit distance. 4453// Also only accept corrections that have the same parent decl. 4454class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4455 public: 4456 DifferentNameValidatorCCC(CXXRecordDecl *Parent) 4457 : ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {} 4458 4459 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4460 if (candidate.getEditDistance() == 0) 4461 return false; 4462 4463 if (CXXMethodDecl *MD = candidate.getCorrectionDeclAs<CXXMethodDecl>()) { 4464 CXXRecordDecl *Parent = MD->getParent(); 4465 return Parent && Parent->getCanonicalDecl() == ExpectedParent; 4466 } 4467 4468 return !ExpectedParent; 4469 } 4470 4471 private: 4472 CXXRecordDecl *ExpectedParent; 4473}; 4474 4475} 4476 4477/// \brief Generate diagnostics for an invalid function redeclaration. 4478/// 4479/// This routine handles generating the diagnostic messages for an invalid 4480/// function redeclaration, including finding possible similar declarations 4481/// or performing typo correction if there are no previous declarations with 4482/// the same name. 4483/// 4484/// Returns a NamedDecl iff typo correction was performed and substituting in 4485/// the new declaration name does not cause new errors. 4486static NamedDecl* DiagnoseInvalidRedeclaration( 4487 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4488 ActOnFDArgs &ExtraArgs) { 4489 NamedDecl *Result = NULL; 4490 DeclarationName Name = NewFD->getDeclName(); 4491 DeclContext *NewDC = NewFD->getDeclContext(); 4492 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4493 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4494 llvm::SmallVector<unsigned, 1> MismatchedParams; 4495 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4496 TypoCorrection Correction; 4497 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4498 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4499 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4500 : diag::err_member_def_does_not_match; 4501 4502 NewFD->setInvalidDecl(); 4503 SemaRef.LookupQualifiedName(Prev, NewDC); 4504 assert(!Prev.isAmbiguous() && 4505 "Cannot have an ambiguity in previous-declaration lookup"); 4506 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 4507 DifferentNameValidatorCCC Validator(MD ? MD->getParent() : 0); 4508 if (!Prev.empty()) { 4509 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4510 Func != FuncEnd; ++Func) { 4511 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4512 if (FD && 4513 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4514 // Add 1 to the index so that 0 can mean the mismatch didn't 4515 // involve a parameter 4516 unsigned ParamNum = 4517 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4518 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4519 } 4520 } 4521 // If the qualified name lookup yielded nothing, try typo correction 4522 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4523 Prev.getLookupKind(), 0, 0, 4524 Validator, NewDC))) { 4525 // Trap errors. 4526 Sema::SFINAETrap Trap(SemaRef); 4527 4528 // Set up everything for the call to ActOnFunctionDeclarator 4529 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4530 ExtraArgs.D.getIdentifierLoc()); 4531 Previous.clear(); 4532 Previous.setLookupName(Correction.getCorrection()); 4533 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4534 CDeclEnd = Correction.end(); 4535 CDecl != CDeclEnd; ++CDecl) { 4536 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4537 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4538 MismatchedParams)) { 4539 Previous.addDecl(FD); 4540 } 4541 } 4542 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4543 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4544 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4545 // eliminate the need for the parameter pack ExtraArgs. 4546 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4547 NewFD->getDeclContext(), 4548 NewFD->getTypeSourceInfo(), 4549 Previous, 4550 ExtraArgs.TemplateParamLists, 4551 ExtraArgs.AddToScope); 4552 if (Trap.hasErrorOccurred()) { 4553 // Pretend the typo correction never occurred 4554 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4555 ExtraArgs.D.getIdentifierLoc()); 4556 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4557 Previous.clear(); 4558 Previous.setLookupName(Name); 4559 Result = NULL; 4560 } else { 4561 for (LookupResult::iterator Func = Previous.begin(), 4562 FuncEnd = Previous.end(); 4563 Func != FuncEnd; ++Func) { 4564 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4565 NearMatches.push_back(std::make_pair(FD, 0)); 4566 } 4567 } 4568 if (NearMatches.empty()) { 4569 // Ignore the correction if it didn't yield any close FunctionDecl matches 4570 Correction = TypoCorrection(); 4571 } else { 4572 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4573 : diag::err_member_def_does_not_match_suggest; 4574 } 4575 } 4576 4577 if (Correction) 4578 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4579 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4580 << FixItHint::CreateReplacement( 4581 NewFD->getLocation(), 4582 Correction.getAsString(SemaRef.getLangOptions())); 4583 else 4584 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4585 << Name << NewDC << NewFD->getLocation(); 4586 4587 bool NewFDisConst = false; 4588 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4589 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4590 4591 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4592 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4593 NearMatch != NearMatchEnd; ++NearMatch) { 4594 FunctionDecl *FD = NearMatch->first; 4595 bool FDisConst = false; 4596 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4597 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4598 4599 if (unsigned Idx = NearMatch->second) { 4600 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4601 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4602 diag::note_member_def_close_param_match) 4603 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4604 } else if (Correction) { 4605 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4606 << Correction.getQuoted(SemaRef.getLangOptions()); 4607 } else if (FDisConst != NewFDisConst) { 4608 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4609 << NewFDisConst << FD->getSourceRange().getEnd(); 4610 } else 4611 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4612 } 4613 return Result; 4614} 4615 4616static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4617 Declarator &D) { 4618 switch (D.getDeclSpec().getStorageClassSpec()) { 4619 default: llvm_unreachable("Unknown storage class!"); 4620 case DeclSpec::SCS_auto: 4621 case DeclSpec::SCS_register: 4622 case DeclSpec::SCS_mutable: 4623 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4624 diag::err_typecheck_sclass_func); 4625 D.setInvalidType(); 4626 break; 4627 case DeclSpec::SCS_unspecified: break; 4628 case DeclSpec::SCS_extern: return SC_Extern; 4629 case DeclSpec::SCS_static: { 4630 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4631 // C99 6.7.1p5: 4632 // The declaration of an identifier for a function that has 4633 // block scope shall have no explicit storage-class specifier 4634 // other than extern 4635 // See also (C++ [dcl.stc]p4). 4636 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4637 diag::err_static_block_func); 4638 break; 4639 } else 4640 return SC_Static; 4641 } 4642 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4643 } 4644 4645 // No explicit storage class has already been returned 4646 return SC_None; 4647} 4648 4649static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4650 DeclContext *DC, QualType &R, 4651 TypeSourceInfo *TInfo, 4652 FunctionDecl::StorageClass SC, 4653 bool &IsVirtualOkay) { 4654 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4655 DeclarationName Name = NameInfo.getName(); 4656 4657 FunctionDecl *NewFD = 0; 4658 bool isInline = D.getDeclSpec().isInlineSpecified(); 4659 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4660 FunctionDecl::StorageClass SCAsWritten 4661 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4662 4663 if (!SemaRef.getLangOptions().CPlusPlus) { 4664 // Determine whether the function was written with a 4665 // prototype. This true when: 4666 // - there is a prototype in the declarator, or 4667 // - the type R of the function is some kind of typedef or other reference 4668 // to a type name (which eventually refers to a function type). 4669 bool HasPrototype = 4670 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4671 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4672 4673 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4674 D.getSourceRange().getBegin(), NameInfo, R, 4675 TInfo, SC, SCAsWritten, isInline, 4676 HasPrototype); 4677 if (D.isInvalidType()) 4678 NewFD->setInvalidDecl(); 4679 4680 // Set the lexical context. 4681 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4682 4683 return NewFD; 4684 } 4685 4686 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4687 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4688 4689 // Check that the return type is not an abstract class type. 4690 // For record types, this is done by the AbstractClassUsageDiagnoser once 4691 // the class has been completely parsed. 4692 if (!DC->isRecord() && 4693 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4694 R->getAs<FunctionType>()->getResultType(), 4695 diag::err_abstract_type_in_decl, 4696 SemaRef.AbstractReturnType)) 4697 D.setInvalidType(); 4698 4699 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4700 // This is a C++ constructor declaration. 4701 assert(DC->isRecord() && 4702 "Constructors can only be declared in a member context"); 4703 4704 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4705 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4706 D.getSourceRange().getBegin(), NameInfo, 4707 R, TInfo, isExplicit, isInline, 4708 /*isImplicitlyDeclared=*/false, 4709 isConstexpr); 4710 4711 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4712 // This is a C++ destructor declaration. 4713 if (DC->isRecord()) { 4714 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4715 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4716 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4717 SemaRef.Context, Record, 4718 D.getSourceRange().getBegin(), 4719 NameInfo, R, TInfo, isInline, 4720 /*isImplicitlyDeclared=*/false); 4721 4722 // If the class is complete, then we now create the implicit exception 4723 // specification. If the class is incomplete or dependent, we can't do 4724 // it yet. 4725 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4726 Record->getDefinition() && !Record->isBeingDefined() && 4727 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4728 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4729 } 4730 4731 IsVirtualOkay = true; 4732 return NewDD; 4733 4734 } else { 4735 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4736 D.setInvalidType(); 4737 4738 // Create a FunctionDecl to satisfy the function definition parsing 4739 // code path. 4740 return FunctionDecl::Create(SemaRef.Context, DC, 4741 D.getSourceRange().getBegin(), 4742 D.getIdentifierLoc(), Name, R, TInfo, 4743 SC, SCAsWritten, isInline, 4744 /*hasPrototype=*/true, isConstexpr); 4745 } 4746 4747 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4748 if (!DC->isRecord()) { 4749 SemaRef.Diag(D.getIdentifierLoc(), 4750 diag::err_conv_function_not_member); 4751 return 0; 4752 } 4753 4754 SemaRef.CheckConversionDeclarator(D, R, SC); 4755 IsVirtualOkay = true; 4756 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4757 D.getSourceRange().getBegin(), NameInfo, 4758 R, TInfo, isInline, isExplicit, 4759 isConstexpr, SourceLocation()); 4760 4761 } else if (DC->isRecord()) { 4762 // If the name of the function is the same as the name of the record, 4763 // then this must be an invalid constructor that has a return type. 4764 // (The parser checks for a return type and makes the declarator a 4765 // constructor if it has no return type). 4766 if (Name.getAsIdentifierInfo() && 4767 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4768 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4769 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4770 << SourceRange(D.getIdentifierLoc()); 4771 return 0; 4772 } 4773 4774 bool isStatic = SC == SC_Static; 4775 4776 // [class.free]p1: 4777 // Any allocation function for a class T is a static member 4778 // (even if not explicitly declared static). 4779 if (Name.getCXXOverloadedOperator() == OO_New || 4780 Name.getCXXOverloadedOperator() == OO_Array_New) 4781 isStatic = true; 4782 4783 // [class.free]p6 Any deallocation function for a class X is a static member 4784 // (even if not explicitly declared static). 4785 if (Name.getCXXOverloadedOperator() == OO_Delete || 4786 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4787 isStatic = true; 4788 4789 IsVirtualOkay = !isStatic; 4790 4791 // This is a C++ method declaration. 4792 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4793 D.getSourceRange().getBegin(), NameInfo, R, 4794 TInfo, isStatic, SCAsWritten, isInline, 4795 isConstexpr, SourceLocation()); 4796 4797 } else { 4798 // Determine whether the function was written with a 4799 // prototype. This true when: 4800 // - we're in C++ (where every function has a prototype), 4801 return FunctionDecl::Create(SemaRef.Context, DC, 4802 D.getSourceRange().getBegin(), 4803 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4804 true/*HasPrototype*/, isConstexpr); 4805 } 4806} 4807 4808NamedDecl* 4809Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4810 TypeSourceInfo *TInfo, LookupResult &Previous, 4811 MultiTemplateParamsArg TemplateParamLists, 4812 bool &AddToScope) { 4813 QualType R = TInfo->getType(); 4814 4815 assert(R.getTypePtr()->isFunctionType()); 4816 4817 InFunctionDeclarator = false; 4818 4819 // TODO: consider using NameInfo for diagnostic. 4820 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4821 DeclarationName Name = NameInfo.getName(); 4822 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4823 4824 if (D.getDeclSpec().isThreadSpecified()) 4825 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4826 4827 // Do not allow returning a objc interface by-value. 4828 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4829 Diag(D.getIdentifierLoc(), 4830 diag::err_object_cannot_be_passed_returned_by_value) << 0 4831 << R->getAs<FunctionType>()->getResultType() 4832 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4833 4834 QualType T = R->getAs<FunctionType>()->getResultType(); 4835 T = Context.getObjCObjectPointerType(T); 4836 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4837 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4838 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4839 FPT->getNumArgs(), EPI); 4840 } 4841 else if (isa<FunctionNoProtoType>(R)) 4842 R = Context.getFunctionNoProtoType(T); 4843 } 4844 4845 bool isFriend = false; 4846 FunctionTemplateDecl *FunctionTemplate = 0; 4847 bool isExplicitSpecialization = false; 4848 bool isFunctionTemplateSpecialization = false; 4849 bool isDependentClassScopeExplicitSpecialization = false; 4850 bool isVirtualOkay = false; 4851 4852 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4853 isVirtualOkay); 4854 if (!NewFD) return 0; 4855 4856 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4857 NewFD->setTopLevelDeclInObjCContainer(); 4858 4859 if (getLangOptions().CPlusPlus) { 4860 bool isInline = D.getDeclSpec().isInlineSpecified(); 4861 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4862 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4863 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4864 isFriend = D.getDeclSpec().isFriendSpecified(); 4865 if (isFriend && !isInline && D.isFunctionDefinition()) { 4866 // C++ [class.friend]p5 4867 // A function can be defined in a friend declaration of a 4868 // class . . . . Such a function is implicitly inline. 4869 NewFD->setImplicitlyInline(); 4870 } 4871 4872 SetNestedNameSpecifier(NewFD, D); 4873 isExplicitSpecialization = false; 4874 isFunctionTemplateSpecialization = false; 4875 if (D.isInvalidType()) 4876 NewFD->setInvalidDecl(); 4877 4878 // Set the lexical context. If the declarator has a C++ 4879 // scope specifier, or is the object of a friend declaration, the 4880 // lexical context will be different from the semantic context. 4881 NewFD->setLexicalDeclContext(CurContext); 4882 4883 // Match up the template parameter lists with the scope specifier, then 4884 // determine whether we have a template or a template specialization. 4885 bool Invalid = false; 4886 if (TemplateParameterList *TemplateParams 4887 = MatchTemplateParametersToScopeSpecifier( 4888 D.getDeclSpec().getSourceRange().getBegin(), 4889 D.getIdentifierLoc(), 4890 D.getCXXScopeSpec(), 4891 TemplateParamLists.get(), 4892 TemplateParamLists.size(), 4893 isFriend, 4894 isExplicitSpecialization, 4895 Invalid)) { 4896 if (TemplateParams->size() > 0) { 4897 // This is a function template 4898 4899 // Check that we can declare a template here. 4900 if (CheckTemplateDeclScope(S, TemplateParams)) 4901 return 0; 4902 4903 // A destructor cannot be a template. 4904 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4905 Diag(NewFD->getLocation(), diag::err_destructor_template); 4906 return 0; 4907 } 4908 4909 // If we're adding a template to a dependent context, we may need to 4910 // rebuilding some of the types used within the template parameter list, 4911 // now that we know what the current instantiation is. 4912 if (DC->isDependentContext()) { 4913 ContextRAII SavedContext(*this, DC); 4914 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4915 Invalid = true; 4916 } 4917 4918 4919 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4920 NewFD->getLocation(), 4921 Name, TemplateParams, 4922 NewFD); 4923 FunctionTemplate->setLexicalDeclContext(CurContext); 4924 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4925 4926 // For source fidelity, store the other template param lists. 4927 if (TemplateParamLists.size() > 1) { 4928 NewFD->setTemplateParameterListsInfo(Context, 4929 TemplateParamLists.size() - 1, 4930 TemplateParamLists.release()); 4931 } 4932 } else { 4933 // This is a function template specialization. 4934 isFunctionTemplateSpecialization = true; 4935 // For source fidelity, store all the template param lists. 4936 NewFD->setTemplateParameterListsInfo(Context, 4937 TemplateParamLists.size(), 4938 TemplateParamLists.release()); 4939 4940 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4941 if (isFriend) { 4942 // We want to remove the "template<>", found here. 4943 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4944 4945 // If we remove the template<> and the name is not a 4946 // template-id, we're actually silently creating a problem: 4947 // the friend declaration will refer to an untemplated decl, 4948 // and clearly the user wants a template specialization. So 4949 // we need to insert '<>' after the name. 4950 SourceLocation InsertLoc; 4951 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4952 InsertLoc = D.getName().getSourceRange().getEnd(); 4953 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4954 } 4955 4956 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4957 << Name << RemoveRange 4958 << FixItHint::CreateRemoval(RemoveRange) 4959 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4960 } 4961 } 4962 } 4963 else { 4964 // All template param lists were matched against the scope specifier: 4965 // this is NOT (an explicit specialization of) a template. 4966 if (TemplateParamLists.size() > 0) 4967 // For source fidelity, store all the template param lists. 4968 NewFD->setTemplateParameterListsInfo(Context, 4969 TemplateParamLists.size(), 4970 TemplateParamLists.release()); 4971 } 4972 4973 if (Invalid) { 4974 NewFD->setInvalidDecl(); 4975 if (FunctionTemplate) 4976 FunctionTemplate->setInvalidDecl(); 4977 } 4978 4979 // If we see "T var();" at block scope, where T is a class type, it is 4980 // probably an attempt to initialize a variable, not a function declaration. 4981 // We don't catch this case earlier, since there is no ambiguity here. 4982 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 4983 CurContext->isFunctionOrMethod() && 4984 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 4985 D.getDeclSpec().getStorageClassSpecAsWritten() 4986 == DeclSpec::SCS_unspecified) { 4987 QualType T = R->getAs<FunctionType>()->getResultType(); 4988 DeclaratorChunk &C = D.getTypeObject(0); 4989 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 4990 !C.Fun.TrailingReturnType && 4991 C.Fun.getExceptionSpecType() == EST_None) { 4992 SourceRange ParenRange(C.Loc, C.EndLoc); 4993 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 4994 4995 // If the declaration looks like: 4996 // T var1, 4997 // f(); 4998 // and name lookup finds a function named 'f', then the ',' was 4999 // probably intended to be a ';'. 5000 if (!D.isFirstDeclarator() && D.getIdentifier()) { 5001 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 5002 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 5003 if (Comma.getFileID() != Name.getFileID() || 5004 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 5005 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 5006 LookupOrdinaryName); 5007 if (LookupName(Result, S)) 5008 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 5009 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 5010 } 5011 } 5012 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 5013 // Empty parens mean value-initialization, and no parens mean default 5014 // initialization. These are equivalent if the default constructor is 5015 // user-provided, or if zero-initialization is a no-op. 5016 if (RD && RD->hasDefinition() && 5017 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 5018 Diag(C.Loc, diag::note_empty_parens_default_ctor) 5019 << FixItHint::CreateRemoval(ParenRange); 5020 else if (const char *Init = getFixItZeroInitializerForType(T)) 5021 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5022 << FixItHint::CreateReplacement(ParenRange, Init); 5023 else if (LangOpts.CPlusPlus0x) 5024 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5025 << FixItHint::CreateReplacement(ParenRange, "{}"); 5026 } 5027 } 5028 5029 // C++ [dcl.fct.spec]p5: 5030 // The virtual specifier shall only be used in declarations of 5031 // nonstatic class member functions that appear within a 5032 // member-specification of a class declaration; see 10.3. 5033 // 5034 if (isVirtual && !NewFD->isInvalidDecl()) { 5035 if (!isVirtualOkay) { 5036 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5037 diag::err_virtual_non_function); 5038 } else if (!CurContext->isRecord()) { 5039 // 'virtual' was specified outside of the class. 5040 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5041 diag::err_virtual_out_of_class) 5042 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5043 } else if (NewFD->getDescribedFunctionTemplate()) { 5044 // C++ [temp.mem]p3: 5045 // A member function template shall not be virtual. 5046 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5047 diag::err_virtual_member_function_template) 5048 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5049 } else { 5050 // Okay: Add virtual to the method. 5051 NewFD->setVirtualAsWritten(true); 5052 } 5053 } 5054 5055 // C++ [dcl.fct.spec]p3: 5056 // The inline specifier shall not appear on a block scope function 5057 // declaration. 5058 if (isInline && !NewFD->isInvalidDecl()) { 5059 if (CurContext->isFunctionOrMethod()) { 5060 // 'inline' is not allowed on block scope function declaration. 5061 Diag(D.getDeclSpec().getInlineSpecLoc(), 5062 diag::err_inline_declaration_block_scope) << Name 5063 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5064 } 5065 } 5066 5067 // C++ [dcl.fct.spec]p6: 5068 // The explicit specifier shall be used only in the declaration of a 5069 // constructor or conversion function within its class definition; 5070 // see 12.3.1 and 12.3.2. 5071 if (isExplicit && !NewFD->isInvalidDecl()) { 5072 if (!CurContext->isRecord()) { 5073 // 'explicit' was specified outside of the class. 5074 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5075 diag::err_explicit_out_of_class) 5076 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5077 } else if (!isa<CXXConstructorDecl>(NewFD) && 5078 !isa<CXXConversionDecl>(NewFD)) { 5079 // 'explicit' was specified on a function that wasn't a constructor 5080 // or conversion function. 5081 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5082 diag::err_explicit_non_ctor_or_conv_function) 5083 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5084 } 5085 } 5086 5087 if (isConstexpr) { 5088 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5089 // are implicitly inline. 5090 NewFD->setImplicitlyInline(); 5091 5092 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5093 // be either constructors or to return a literal type. Therefore, 5094 // destructors cannot be declared constexpr. 5095 if (isa<CXXDestructorDecl>(NewFD)) 5096 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5097 } 5098 5099 // If __module_private__ was specified, mark the function accordingly. 5100 if (D.getDeclSpec().isModulePrivateSpecified()) { 5101 if (isFunctionTemplateSpecialization) { 5102 SourceLocation ModulePrivateLoc 5103 = D.getDeclSpec().getModulePrivateSpecLoc(); 5104 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5105 << 0 5106 << FixItHint::CreateRemoval(ModulePrivateLoc); 5107 } else { 5108 NewFD->setModulePrivate(); 5109 if (FunctionTemplate) 5110 FunctionTemplate->setModulePrivate(); 5111 } 5112 } 5113 5114 if (isFriend) { 5115 // For now, claim that the objects have no previous declaration. 5116 if (FunctionTemplate) { 5117 FunctionTemplate->setObjectOfFriendDecl(false); 5118 FunctionTemplate->setAccess(AS_public); 5119 } 5120 NewFD->setObjectOfFriendDecl(false); 5121 NewFD->setAccess(AS_public); 5122 } 5123 5124 // If a function is defined as defaulted or deleted, mark it as such now. 5125 switch (D.getFunctionDefinitionKind()) { 5126 case FDK_Declaration: 5127 case FDK_Definition: 5128 break; 5129 5130 case FDK_Defaulted: 5131 NewFD->setDefaulted(); 5132 break; 5133 5134 case FDK_Deleted: 5135 NewFD->setDeletedAsWritten(); 5136 break; 5137 } 5138 5139 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5140 D.isFunctionDefinition()) { 5141 // C++ [class.mfct]p2: 5142 // A member function may be defined (8.4) in its class definition, in 5143 // which case it is an inline member function (7.1.2) 5144 NewFD->setImplicitlyInline(); 5145 } 5146 5147 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5148 !CurContext->isRecord()) { 5149 // C++ [class.static]p1: 5150 // A data or function member of a class may be declared static 5151 // in a class definition, in which case it is a static member of 5152 // the class. 5153 5154 // Complain about the 'static' specifier if it's on an out-of-line 5155 // member function definition. 5156 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5157 diag::err_static_out_of_line) 5158 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5159 } 5160 } 5161 5162 // Filter out previous declarations that don't match the scope. 5163 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5164 isExplicitSpecialization || 5165 isFunctionTemplateSpecialization); 5166 5167 // Handle GNU asm-label extension (encoded as an attribute). 5168 if (Expr *E = (Expr*) D.getAsmLabel()) { 5169 // The parser guarantees this is a string. 5170 StringLiteral *SE = cast<StringLiteral>(E); 5171 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5172 SE->getString())); 5173 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 5174 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 5175 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); 5176 if (I != ExtnameUndeclaredIdentifiers.end()) { 5177 NewFD->addAttr(I->second); 5178 ExtnameUndeclaredIdentifiers.erase(I); 5179 } 5180 } 5181 5182 // Copy the parameter declarations from the declarator D to the function 5183 // declaration NewFD, if they are available. First scavenge them into Params. 5184 SmallVector<ParmVarDecl*, 16> Params; 5185 if (D.isFunctionDeclarator()) { 5186 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5187 5188 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5189 // function that takes no arguments, not a function that takes a 5190 // single void argument. 5191 // We let through "const void" here because Sema::GetTypeForDeclarator 5192 // already checks for that case. 5193 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5194 FTI.ArgInfo[0].Param && 5195 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5196 // Empty arg list, don't push any params. 5197 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5198 5199 // In C++, the empty parameter-type-list must be spelled "void"; a 5200 // typedef of void is not permitted. 5201 if (getLangOptions().CPlusPlus && 5202 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5203 bool IsTypeAlias = false; 5204 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5205 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5206 else if (const TemplateSpecializationType *TST = 5207 Param->getType()->getAs<TemplateSpecializationType>()) 5208 IsTypeAlias = TST->isTypeAlias(); 5209 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5210 << IsTypeAlias; 5211 } 5212 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5213 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5214 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5215 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5216 Param->setDeclContext(NewFD); 5217 Params.push_back(Param); 5218 5219 if (Param->isInvalidDecl()) 5220 NewFD->setInvalidDecl(); 5221 } 5222 } 5223 5224 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5225 // When we're declaring a function with a typedef, typeof, etc as in the 5226 // following example, we'll need to synthesize (unnamed) 5227 // parameters for use in the declaration. 5228 // 5229 // @code 5230 // typedef void fn(int); 5231 // fn f; 5232 // @endcode 5233 5234 // Synthesize a parameter for each argument type. 5235 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5236 AE = FT->arg_type_end(); AI != AE; ++AI) { 5237 ParmVarDecl *Param = 5238 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5239 Param->setScopeInfo(0, Params.size()); 5240 Params.push_back(Param); 5241 } 5242 } else { 5243 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5244 "Should not need args for typedef of non-prototype fn"); 5245 } 5246 5247 // Finally, we know we have the right number of parameters, install them. 5248 NewFD->setParams(Params); 5249 5250 // Find all anonymous symbols defined during the declaration of this function 5251 // and add to NewFD. This lets us track decls such 'enum Y' in: 5252 // 5253 // void f(enum Y {AA} x) {} 5254 // 5255 // which would otherwise incorrectly end up in the translation unit scope. 5256 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope); 5257 DeclsInPrototypeScope.clear(); 5258 5259 // Process the non-inheritable attributes on this declaration. 5260 ProcessDeclAttributes(S, NewFD, D, 5261 /*NonInheritable=*/true, /*Inheritable=*/false); 5262 5263 if (!getLangOptions().CPlusPlus) { 5264 // Perform semantic checking on the function declaration. 5265 bool isExplicitSpecialization=false; 5266 if (!NewFD->isInvalidDecl()) { 5267 if (NewFD->getResultType()->isVariablyModifiedType()) { 5268 // Functions returning a variably modified type violate C99 6.7.5.2p2 5269 // because all functions have linkage. 5270 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5271 NewFD->setInvalidDecl(); 5272 } else { 5273 if (NewFD->isMain()) 5274 CheckMain(NewFD, D.getDeclSpec()); 5275 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5276 isExplicitSpecialization)); 5277 } 5278 } 5279 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5280 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5281 "previous declaration set still overloaded"); 5282 } else { 5283 // If the declarator is a template-id, translate the parser's template 5284 // argument list into our AST format. 5285 bool HasExplicitTemplateArgs = false; 5286 TemplateArgumentListInfo TemplateArgs; 5287 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5288 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5289 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5290 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5291 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5292 TemplateId->getTemplateArgs(), 5293 TemplateId->NumArgs); 5294 translateTemplateArguments(TemplateArgsPtr, 5295 TemplateArgs); 5296 TemplateArgsPtr.release(); 5297 5298 HasExplicitTemplateArgs = true; 5299 5300 if (NewFD->isInvalidDecl()) { 5301 HasExplicitTemplateArgs = false; 5302 } else if (FunctionTemplate) { 5303 // Function template with explicit template arguments. 5304 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5305 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5306 5307 HasExplicitTemplateArgs = false; 5308 } else if (!isFunctionTemplateSpecialization && 5309 !D.getDeclSpec().isFriendSpecified()) { 5310 // We have encountered something that the user meant to be a 5311 // specialization (because it has explicitly-specified template 5312 // arguments) but that was not introduced with a "template<>" (or had 5313 // too few of them). 5314 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5315 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5316 << FixItHint::CreateInsertion( 5317 D.getDeclSpec().getSourceRange().getBegin(), 5318 "template<> "); 5319 isFunctionTemplateSpecialization = true; 5320 } else { 5321 // "friend void foo<>(int);" is an implicit specialization decl. 5322 isFunctionTemplateSpecialization = true; 5323 } 5324 } else if (isFriend && isFunctionTemplateSpecialization) { 5325 // This combination is only possible in a recovery case; the user 5326 // wrote something like: 5327 // template <> friend void foo(int); 5328 // which we're recovering from as if the user had written: 5329 // friend void foo<>(int); 5330 // Go ahead and fake up a template id. 5331 HasExplicitTemplateArgs = true; 5332 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5333 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5334 } 5335 5336 // If it's a friend (and only if it's a friend), it's possible 5337 // that either the specialized function type or the specialized 5338 // template is dependent, and therefore matching will fail. In 5339 // this case, don't check the specialization yet. 5340 bool InstantiationDependent = false; 5341 if (isFunctionTemplateSpecialization && isFriend && 5342 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5343 TemplateSpecializationType::anyDependentTemplateArguments( 5344 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5345 InstantiationDependent))) { 5346 assert(HasExplicitTemplateArgs && 5347 "friend function specialization without template args"); 5348 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5349 Previous)) 5350 NewFD->setInvalidDecl(); 5351 } else if (isFunctionTemplateSpecialization) { 5352 if (CurContext->isDependentContext() && CurContext->isRecord() 5353 && !isFriend) { 5354 isDependentClassScopeExplicitSpecialization = true; 5355 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5356 diag::ext_function_specialization_in_class : 5357 diag::err_function_specialization_in_class) 5358 << NewFD->getDeclName(); 5359 } else if (CheckFunctionTemplateSpecialization(NewFD, 5360 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5361 Previous)) 5362 NewFD->setInvalidDecl(); 5363 5364 // C++ [dcl.stc]p1: 5365 // A storage-class-specifier shall not be specified in an explicit 5366 // specialization (14.7.3) 5367 if (SC != SC_None) { 5368 if (SC != NewFD->getStorageClass()) 5369 Diag(NewFD->getLocation(), 5370 diag::err_explicit_specialization_inconsistent_storage_class) 5371 << SC 5372 << FixItHint::CreateRemoval( 5373 D.getDeclSpec().getStorageClassSpecLoc()); 5374 5375 else 5376 Diag(NewFD->getLocation(), 5377 diag::ext_explicit_specialization_storage_class) 5378 << FixItHint::CreateRemoval( 5379 D.getDeclSpec().getStorageClassSpecLoc()); 5380 } 5381 5382 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5383 if (CheckMemberSpecialization(NewFD, Previous)) 5384 NewFD->setInvalidDecl(); 5385 } 5386 5387 // Perform semantic checking on the function declaration. 5388 if (!isDependentClassScopeExplicitSpecialization) { 5389 if (NewFD->isInvalidDecl()) { 5390 // If this is a class member, mark the class invalid immediately. 5391 // This avoids some consistency errors later. 5392 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5393 methodDecl->getParent()->setInvalidDecl(); 5394 } else { 5395 if (NewFD->isMain()) 5396 CheckMain(NewFD, D.getDeclSpec()); 5397 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5398 isExplicitSpecialization)); 5399 } 5400 } 5401 5402 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5403 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5404 "previous declaration set still overloaded"); 5405 5406 NamedDecl *PrincipalDecl = (FunctionTemplate 5407 ? cast<NamedDecl>(FunctionTemplate) 5408 : NewFD); 5409 5410 if (isFriend && D.isRedeclaration()) { 5411 AccessSpecifier Access = AS_public; 5412 if (!NewFD->isInvalidDecl()) 5413 Access = NewFD->getPreviousDecl()->getAccess(); 5414 5415 NewFD->setAccess(Access); 5416 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5417 5418 PrincipalDecl->setObjectOfFriendDecl(true); 5419 } 5420 5421 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5422 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5423 PrincipalDecl->setNonMemberOperator(); 5424 5425 // If we have a function template, check the template parameter 5426 // list. This will check and merge default template arguments. 5427 if (FunctionTemplate) { 5428 FunctionTemplateDecl *PrevTemplate = 5429 FunctionTemplate->getPreviousDecl(); 5430 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5431 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5432 D.getDeclSpec().isFriendSpecified() 5433 ? (D.isFunctionDefinition() 5434 ? TPC_FriendFunctionTemplateDefinition 5435 : TPC_FriendFunctionTemplate) 5436 : (D.getCXXScopeSpec().isSet() && 5437 DC && DC->isRecord() && 5438 DC->isDependentContext()) 5439 ? TPC_ClassTemplateMember 5440 : TPC_FunctionTemplate); 5441 } 5442 5443 if (NewFD->isInvalidDecl()) { 5444 // Ignore all the rest of this. 5445 } else if (!D.isRedeclaration()) { 5446 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5447 AddToScope }; 5448 // Fake up an access specifier if it's supposed to be a class member. 5449 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5450 NewFD->setAccess(AS_public); 5451 5452 // Qualified decls generally require a previous declaration. 5453 if (D.getCXXScopeSpec().isSet()) { 5454 // ...with the major exception of templated-scope or 5455 // dependent-scope friend declarations. 5456 5457 // TODO: we currently also suppress this check in dependent 5458 // contexts because (1) the parameter depth will be off when 5459 // matching friend templates and (2) we might actually be 5460 // selecting a friend based on a dependent factor. But there 5461 // are situations where these conditions don't apply and we 5462 // can actually do this check immediately. 5463 if (isFriend && 5464 (TemplateParamLists.size() || 5465 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5466 CurContext->isDependentContext())) { 5467 // ignore these 5468 } else { 5469 // The user tried to provide an out-of-line definition for a 5470 // function that is a member of a class or namespace, but there 5471 // was no such member function declared (C++ [class.mfct]p2, 5472 // C++ [namespace.memdef]p2). For example: 5473 // 5474 // class X { 5475 // void f() const; 5476 // }; 5477 // 5478 // void X::f() { } // ill-formed 5479 // 5480 // Complain about this problem, and attempt to suggest close 5481 // matches (e.g., those that differ only in cv-qualifiers and 5482 // whether the parameter types are references). 5483 5484 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5485 NewFD, 5486 ExtraArgs)) { 5487 AddToScope = ExtraArgs.AddToScope; 5488 return Result; 5489 } 5490 } 5491 5492 // Unqualified local friend declarations are required to resolve 5493 // to something. 5494 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5495 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5496 NewFD, 5497 ExtraArgs)) { 5498 AddToScope = ExtraArgs.AddToScope; 5499 return Result; 5500 } 5501 } 5502 5503 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5504 !isFriend && !isFunctionTemplateSpecialization && 5505 !isExplicitSpecialization) { 5506 // An out-of-line member function declaration must also be a 5507 // definition (C++ [dcl.meaning]p1). 5508 // Note that this is not the case for explicit specializations of 5509 // function templates or member functions of class templates, per 5510 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5511 // extension for compatibility with old SWIG code which likes to 5512 // generate them. 5513 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5514 << D.getCXXScopeSpec().getRange(); 5515 } 5516 } 5517 5518 5519 // Handle attributes. We need to have merged decls when handling attributes 5520 // (for example to check for conflicts, etc). 5521 // FIXME: This needs to happen before we merge declarations. Then, 5522 // let attribute merging cope with attribute conflicts. 5523 ProcessDeclAttributes(S, NewFD, D, 5524 /*NonInheritable=*/false, /*Inheritable=*/true); 5525 5526 // attributes declared post-definition are currently ignored 5527 // FIXME: This should happen during attribute merging 5528 if (D.isRedeclaration() && Previous.isSingleResult()) { 5529 const FunctionDecl *Def; 5530 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5531 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5532 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5533 Diag(Def->getLocation(), diag::note_previous_definition); 5534 } 5535 } 5536 5537 AddKnownFunctionAttributes(NewFD); 5538 5539 if (NewFD->hasAttr<OverloadableAttr>() && 5540 !NewFD->getType()->getAs<FunctionProtoType>()) { 5541 Diag(NewFD->getLocation(), 5542 diag::err_attribute_overloadable_no_prototype) 5543 << NewFD; 5544 5545 // Turn this into a variadic function with no parameters. 5546 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5547 FunctionProtoType::ExtProtoInfo EPI; 5548 EPI.Variadic = true; 5549 EPI.ExtInfo = FT->getExtInfo(); 5550 5551 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5552 NewFD->setType(R); 5553 } 5554 5555 // If there's a #pragma GCC visibility in scope, and this isn't a class 5556 // member, set the visibility of this function. 5557 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5558 AddPushedVisibilityAttribute(NewFD); 5559 5560 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5561 // marking the function. 5562 AddCFAuditedAttribute(NewFD); 5563 5564 // If this is a locally-scoped extern C function, update the 5565 // map of such names. 5566 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5567 && !NewFD->isInvalidDecl()) 5568 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5569 5570 // Set this FunctionDecl's range up to the right paren. 5571 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5572 5573 if (getLangOptions().CPlusPlus) { 5574 if (FunctionTemplate) { 5575 if (NewFD->isInvalidDecl()) 5576 FunctionTemplate->setInvalidDecl(); 5577 return FunctionTemplate; 5578 } 5579 } 5580 5581 MarkUnusedFileScopedDecl(NewFD); 5582 5583 if (getLangOptions().CUDA) 5584 if (IdentifierInfo *II = NewFD->getIdentifier()) 5585 if (!NewFD->isInvalidDecl() && 5586 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5587 if (II->isStr("cudaConfigureCall")) { 5588 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5589 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5590 5591 Context.setcudaConfigureCallDecl(NewFD); 5592 } 5593 } 5594 5595 // Here we have an function template explicit specialization at class scope. 5596 // The actually specialization will be postponed to template instatiation 5597 // time via the ClassScopeFunctionSpecializationDecl node. 5598 if (isDependentClassScopeExplicitSpecialization) { 5599 ClassScopeFunctionSpecializationDecl *NewSpec = 5600 ClassScopeFunctionSpecializationDecl::Create( 5601 Context, CurContext, SourceLocation(), 5602 cast<CXXMethodDecl>(NewFD)); 5603 CurContext->addDecl(NewSpec); 5604 AddToScope = false; 5605 } 5606 5607 return NewFD; 5608} 5609 5610/// \brief Perform semantic checking of a new function declaration. 5611/// 5612/// Performs semantic analysis of the new function declaration 5613/// NewFD. This routine performs all semantic checking that does not 5614/// require the actual declarator involved in the declaration, and is 5615/// used both for the declaration of functions as they are parsed 5616/// (called via ActOnDeclarator) and for the declaration of functions 5617/// that have been instantiated via C++ template instantiation (called 5618/// via InstantiateDecl). 5619/// 5620/// \param IsExplicitSpecialiation whether this new function declaration is 5621/// an explicit specialization of the previous declaration. 5622/// 5623/// This sets NewFD->isInvalidDecl() to true if there was an error. 5624/// 5625/// Returns true if the function declaration is a redeclaration. 5626bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5627 LookupResult &Previous, 5628 bool IsExplicitSpecialization) { 5629 assert(!NewFD->getResultType()->isVariablyModifiedType() 5630 && "Variably modified return types are not handled here"); 5631 5632 // Check for a previous declaration of this name. 5633 if (Previous.empty() && NewFD->isExternC()) { 5634 // Since we did not find anything by this name and we're declaring 5635 // an extern "C" function, look for a non-visible extern "C" 5636 // declaration with the same name. 5637 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5638 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5639 if (Pos != LocallyScopedExternalDecls.end()) 5640 Previous.addDecl(Pos->second); 5641 } 5642 5643 bool Redeclaration = false; 5644 5645 // Merge or overload the declaration with an existing declaration of 5646 // the same name, if appropriate. 5647 if (!Previous.empty()) { 5648 // Determine whether NewFD is an overload of PrevDecl or 5649 // a declaration that requires merging. If it's an overload, 5650 // there's no more work to do here; we'll just add the new 5651 // function to the scope. 5652 5653 NamedDecl *OldDecl = 0; 5654 if (!AllowOverloadingOfFunction(Previous, Context)) { 5655 Redeclaration = true; 5656 OldDecl = Previous.getFoundDecl(); 5657 } else { 5658 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5659 /*NewIsUsingDecl*/ false)) { 5660 case Ovl_Match: 5661 Redeclaration = true; 5662 break; 5663 5664 case Ovl_NonFunction: 5665 Redeclaration = true; 5666 break; 5667 5668 case Ovl_Overload: 5669 Redeclaration = false; 5670 break; 5671 } 5672 5673 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5674 // If a function name is overloadable in C, then every function 5675 // with that name must be marked "overloadable". 5676 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5677 << Redeclaration << NewFD; 5678 NamedDecl *OverloadedDecl = 0; 5679 if (Redeclaration) 5680 OverloadedDecl = OldDecl; 5681 else if (!Previous.empty()) 5682 OverloadedDecl = Previous.getRepresentativeDecl(); 5683 if (OverloadedDecl) 5684 Diag(OverloadedDecl->getLocation(), 5685 diag::note_attribute_overloadable_prev_overload); 5686 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5687 Context)); 5688 } 5689 } 5690 5691 if (Redeclaration) { 5692 // NewFD and OldDecl represent declarations that need to be 5693 // merged. 5694 if (MergeFunctionDecl(NewFD, OldDecl)) { 5695 NewFD->setInvalidDecl(); 5696 return Redeclaration; 5697 } 5698 5699 Previous.clear(); 5700 Previous.addDecl(OldDecl); 5701 5702 if (FunctionTemplateDecl *OldTemplateDecl 5703 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5704 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5705 FunctionTemplateDecl *NewTemplateDecl 5706 = NewFD->getDescribedFunctionTemplate(); 5707 assert(NewTemplateDecl && "Template/non-template mismatch"); 5708 if (CXXMethodDecl *Method 5709 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5710 Method->setAccess(OldTemplateDecl->getAccess()); 5711 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5712 } 5713 5714 // If this is an explicit specialization of a member that is a function 5715 // template, mark it as a member specialization. 5716 if (IsExplicitSpecialization && 5717 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5718 NewTemplateDecl->setMemberSpecialization(); 5719 assert(OldTemplateDecl->isMemberSpecialization()); 5720 } 5721 5722 } else { 5723 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5724 NewFD->setAccess(OldDecl->getAccess()); 5725 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5726 } 5727 } 5728 } 5729 5730 // Semantic checking for this function declaration (in isolation). 5731 if (getLangOptions().CPlusPlus) { 5732 // C++-specific checks. 5733 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5734 CheckConstructor(Constructor); 5735 } else if (CXXDestructorDecl *Destructor = 5736 dyn_cast<CXXDestructorDecl>(NewFD)) { 5737 CXXRecordDecl *Record = Destructor->getParent(); 5738 QualType ClassType = Context.getTypeDeclType(Record); 5739 5740 // FIXME: Shouldn't we be able to perform this check even when the class 5741 // type is dependent? Both gcc and edg can handle that. 5742 if (!ClassType->isDependentType()) { 5743 DeclarationName Name 5744 = Context.DeclarationNames.getCXXDestructorName( 5745 Context.getCanonicalType(ClassType)); 5746 if (NewFD->getDeclName() != Name) { 5747 Diag(NewFD->getLocation(), diag::err_destructor_name); 5748 NewFD->setInvalidDecl(); 5749 return Redeclaration; 5750 } 5751 } 5752 } else if (CXXConversionDecl *Conversion 5753 = dyn_cast<CXXConversionDecl>(NewFD)) { 5754 ActOnConversionDeclarator(Conversion); 5755 } 5756 5757 // Find any virtual functions that this function overrides. 5758 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5759 if (!Method->isFunctionTemplateSpecialization() && 5760 !Method->getDescribedFunctionTemplate()) { 5761 if (AddOverriddenMethods(Method->getParent(), Method)) { 5762 // If the function was marked as "static", we have a problem. 5763 if (NewFD->getStorageClass() == SC_Static) { 5764 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5765 << NewFD->getDeclName(); 5766 for (CXXMethodDecl::method_iterator 5767 Overridden = Method->begin_overridden_methods(), 5768 OverriddenEnd = Method->end_overridden_methods(); 5769 Overridden != OverriddenEnd; 5770 ++Overridden) { 5771 Diag((*Overridden)->getLocation(), 5772 diag::note_overridden_virtual_function); 5773 } 5774 } 5775 } 5776 } 5777 } 5778 5779 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5780 if (NewFD->isOverloadedOperator() && 5781 CheckOverloadedOperatorDeclaration(NewFD)) { 5782 NewFD->setInvalidDecl(); 5783 return Redeclaration; 5784 } 5785 5786 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5787 if (NewFD->getLiteralIdentifier() && 5788 CheckLiteralOperatorDeclaration(NewFD)) { 5789 NewFD->setInvalidDecl(); 5790 return Redeclaration; 5791 } 5792 5793 // In C++, check default arguments now that we have merged decls. Unless 5794 // the lexical context is the class, because in this case this is done 5795 // during delayed parsing anyway. 5796 if (!CurContext->isRecord()) 5797 CheckCXXDefaultArguments(NewFD); 5798 5799 // If this function declares a builtin function, check the type of this 5800 // declaration against the expected type for the builtin. 5801 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5802 ASTContext::GetBuiltinTypeError Error; 5803 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5804 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5805 // The type of this function differs from the type of the builtin, 5806 // so forget about the builtin entirely. 5807 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5808 } 5809 } 5810 5811 // If this function is declared as being extern "C", then check to see if 5812 // the function returns a UDT (class, struct, or union type) that is not C 5813 // compatible, and if it does, warn the user. 5814 if (NewFD->isExternC()) { 5815 QualType R = NewFD->getResultType(); 5816 if (!R.isPODType(Context) && 5817 !R->isVoidType()) 5818 Diag( NewFD->getLocation(), diag::warn_return_value_udt ) 5819 << NewFD << R; 5820 } 5821 } 5822 return Redeclaration; 5823} 5824 5825void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5826 // C++11 [basic.start.main]p3: A program that declares main to be inline, 5827 // static or constexpr is ill-formed. 5828 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5829 // shall not appear in a declaration of main. 5830 // static main is not an error under C99, but we should warn about it. 5831 if (FD->getStorageClass() == SC_Static) 5832 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5833 ? diag::err_static_main : diag::warn_static_main) 5834 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5835 if (FD->isInlineSpecified()) 5836 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5837 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5838 if (FD->isConstexpr()) { 5839 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 5840 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 5841 FD->setConstexpr(false); 5842 } 5843 5844 QualType T = FD->getType(); 5845 assert(T->isFunctionType() && "function decl is not of function type"); 5846 const FunctionType* FT = T->castAs<FunctionType>(); 5847 5848 // All the standards say that main() should should return 'int'. 5849 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5850 // In C and C++, main magically returns 0 if you fall off the end; 5851 // set the flag which tells us that. 5852 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5853 FD->setHasImplicitReturnZero(true); 5854 5855 // In C with GNU extensions we allow main() to have non-integer return 5856 // type, but we should warn about the extension, and we disable the 5857 // implicit-return-zero rule. 5858 } else if (getLangOptions().GNUMode && !getLangOptions().CPlusPlus) { 5859 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); 5860 5861 // Otherwise, this is just a flat-out error. 5862 } else { 5863 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5864 FD->setInvalidDecl(true); 5865 } 5866 5867 // Treat protoless main() as nullary. 5868 if (isa<FunctionNoProtoType>(FT)) return; 5869 5870 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5871 unsigned nparams = FTP->getNumArgs(); 5872 assert(FD->getNumParams() == nparams); 5873 5874 bool HasExtraParameters = (nparams > 3); 5875 5876 // Darwin passes an undocumented fourth argument of type char**. If 5877 // other platforms start sprouting these, the logic below will start 5878 // getting shifty. 5879 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5880 HasExtraParameters = false; 5881 5882 if (HasExtraParameters) { 5883 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5884 FD->setInvalidDecl(true); 5885 nparams = 3; 5886 } 5887 5888 // FIXME: a lot of the following diagnostics would be improved 5889 // if we had some location information about types. 5890 5891 QualType CharPP = 5892 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5893 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5894 5895 for (unsigned i = 0; i < nparams; ++i) { 5896 QualType AT = FTP->getArgType(i); 5897 5898 bool mismatch = true; 5899 5900 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5901 mismatch = false; 5902 else if (Expected[i] == CharPP) { 5903 // As an extension, the following forms are okay: 5904 // char const ** 5905 // char const * const * 5906 // char * const * 5907 5908 QualifierCollector qs; 5909 const PointerType* PT; 5910 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5911 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5912 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5913 qs.removeConst(); 5914 mismatch = !qs.empty(); 5915 } 5916 } 5917 5918 if (mismatch) { 5919 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5920 // TODO: suggest replacing given type with expected type 5921 FD->setInvalidDecl(true); 5922 } 5923 } 5924 5925 if (nparams == 1 && !FD->isInvalidDecl()) { 5926 Diag(FD->getLocation(), diag::warn_main_one_arg); 5927 } 5928 5929 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5930 Diag(FD->getLocation(), diag::err_main_template_decl); 5931 FD->setInvalidDecl(); 5932 } 5933} 5934 5935bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5936 // FIXME: Need strict checking. In C89, we need to check for 5937 // any assignment, increment, decrement, function-calls, or 5938 // commas outside of a sizeof. In C99, it's the same list, 5939 // except that the aforementioned are allowed in unevaluated 5940 // expressions. Everything else falls under the 5941 // "may accept other forms of constant expressions" exception. 5942 // (We never end up here for C++, so the constant expression 5943 // rules there don't matter.) 5944 if (Init->isConstantInitializer(Context, false)) 5945 return false; 5946 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5947 << Init->getSourceRange(); 5948 return true; 5949} 5950 5951namespace { 5952 // Visits an initialization expression to see if OrigDecl is evaluated in 5953 // its own initialization and throws a warning if it does. 5954 class SelfReferenceChecker 5955 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5956 Sema &S; 5957 Decl *OrigDecl; 5958 bool isRecordType; 5959 bool isPODType; 5960 5961 public: 5962 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5963 5964 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5965 S(S), OrigDecl(OrigDecl) { 5966 isPODType = false; 5967 isRecordType = false; 5968 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5969 isPODType = VD->getType().isPODType(S.Context); 5970 isRecordType = VD->getType()->isRecordType(); 5971 } 5972 } 5973 5974 void VisitExpr(Expr *E) { 5975 if (isa<ObjCMessageExpr>(*E)) return; 5976 if (isRecordType) { 5977 Expr *expr = E; 5978 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5979 ValueDecl *VD = ME->getMemberDecl(); 5980 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5981 expr = ME->getBase(); 5982 } 5983 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5984 HandleDeclRefExpr(DRE); 5985 return; 5986 } 5987 } 5988 Inherited::VisitExpr(E); 5989 } 5990 5991 void VisitMemberExpr(MemberExpr *E) { 5992 if (E->getType()->canDecayToPointerType()) return; 5993 if (isa<FieldDecl>(E->getMemberDecl())) 5994 if (DeclRefExpr *DRE 5995 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5996 HandleDeclRefExpr(DRE); 5997 return; 5998 } 5999 Inherited::VisitMemberExpr(E); 6000 } 6001 6002 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 6003 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 6004 (isRecordType && E->getCastKind() == CK_NoOp)) { 6005 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 6006 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 6007 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 6008 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 6009 HandleDeclRefExpr(DRE); 6010 return; 6011 } 6012 } 6013 Inherited::VisitImplicitCastExpr(E); 6014 } 6015 6016 void VisitUnaryOperator(UnaryOperator *E) { 6017 // For POD record types, addresses of its own members are well-defined. 6018 if (isRecordType && isPODType) return; 6019 Inherited::VisitUnaryOperator(E); 6020 } 6021 6022 void HandleDeclRefExpr(DeclRefExpr *DRE) { 6023 Decl* ReferenceDecl = DRE->getDecl(); 6024 if (OrigDecl != ReferenceDecl) return; 6025 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 6026 Sema::NotForRedeclaration); 6027 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 6028 S.PDiag(diag::warn_uninit_self_reference_in_init) 6029 << Result.getLookupName() 6030 << OrigDecl->getLocation() 6031 << DRE->getSourceRange()); 6032 } 6033 }; 6034} 6035 6036/// CheckSelfReference - Warns if OrigDecl is used in expression E. 6037void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 6038 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 6039} 6040 6041/// AddInitializerToDecl - Adds the initializer Init to the 6042/// declaration dcl. If DirectInit is true, this is C++ direct 6043/// initialization rather than copy initialization. 6044void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 6045 bool DirectInit, bool TypeMayContainAuto) { 6046 // If there is no declaration, there was an error parsing it. Just ignore 6047 // the initializer. 6048 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 6049 return; 6050 6051 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6052 // With declarators parsed the way they are, the parser cannot 6053 // distinguish between a normal initializer and a pure-specifier. 6054 // Thus this grotesque test. 6055 IntegerLiteral *IL; 6056 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6057 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6058 CheckPureMethod(Method, Init->getSourceRange()); 6059 else { 6060 Diag(Method->getLocation(), diag::err_member_function_initialization) 6061 << Method->getDeclName() << Init->getSourceRange(); 6062 Method->setInvalidDecl(); 6063 } 6064 return; 6065 } 6066 6067 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6068 if (!VDecl) { 6069 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6070 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6071 RealDecl->setInvalidDecl(); 6072 return; 6073 } 6074 6075 // Check for self-references within variable initializers. 6076 // Variables declared within a function/method body are handled 6077 // by a dataflow analysis. 6078 if (!VDecl->hasLocalStorage() && !VDecl->isStaticLocal()) 6079 CheckSelfReference(RealDecl, Init); 6080 6081 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); 6082 6083 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6084 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6085 Expr *DeduceInit = Init; 6086 // Initializer could be a C++ direct-initializer. Deduction only works if it 6087 // contains exactly one expression. 6088 if (CXXDirectInit) { 6089 if (CXXDirectInit->getNumExprs() == 0) { 6090 // It isn't possible to write this directly, but it is possible to 6091 // end up in this situation with "auto x(some_pack...);" 6092 Diag(CXXDirectInit->getSourceRange().getBegin(), 6093 diag::err_auto_var_init_no_expression) 6094 << VDecl->getDeclName() << VDecl->getType() 6095 << VDecl->getSourceRange(); 6096 RealDecl->setInvalidDecl(); 6097 return; 6098 } else if (CXXDirectInit->getNumExprs() > 1) { 6099 Diag(CXXDirectInit->getExpr(1)->getSourceRange().getBegin(), 6100 diag::err_auto_var_init_multiple_expressions) 6101 << VDecl->getDeclName() << VDecl->getType() 6102 << VDecl->getSourceRange(); 6103 RealDecl->setInvalidDecl(); 6104 return; 6105 } else { 6106 DeduceInit = CXXDirectInit->getExpr(0); 6107 } 6108 } 6109 TypeSourceInfo *DeducedType = 0; 6110 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) == 6111 DAR_Failed) 6112 DiagnoseAutoDeductionFailure(VDecl, DeduceInit); 6113 if (!DeducedType) { 6114 RealDecl->setInvalidDecl(); 6115 return; 6116 } 6117 VDecl->setTypeSourceInfo(DeducedType); 6118 VDecl->setType(DeducedType->getType()); 6119 VDecl->ClearLinkageCache(); 6120 6121 // In ARC, infer lifetime. 6122 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6123 VDecl->setInvalidDecl(); 6124 6125 // If this is a redeclaration, check that the type we just deduced matches 6126 // the previously declared type. 6127 if (VarDecl *Old = VDecl->getPreviousDecl()) 6128 MergeVarDeclTypes(VDecl, Old); 6129 } 6130 6131 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6132 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6133 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6134 VDecl->setInvalidDecl(); 6135 return; 6136 } 6137 6138 if (!VDecl->getType()->isDependentType()) { 6139 // A definition must end up with a complete type, which means it must be 6140 // complete with the restriction that an array type might be completed by 6141 // the initializer; note that later code assumes this restriction. 6142 QualType BaseDeclType = VDecl->getType(); 6143 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6144 BaseDeclType = Array->getElementType(); 6145 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6146 diag::err_typecheck_decl_incomplete_type)) { 6147 RealDecl->setInvalidDecl(); 6148 return; 6149 } 6150 6151 // The variable can not have an abstract class type. 6152 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6153 diag::err_abstract_type_in_decl, 6154 AbstractVariableType)) 6155 VDecl->setInvalidDecl(); 6156 } 6157 6158 const VarDecl *Def; 6159 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6160 Diag(VDecl->getLocation(), diag::err_redefinition) 6161 << VDecl->getDeclName(); 6162 Diag(Def->getLocation(), diag::note_previous_definition); 6163 VDecl->setInvalidDecl(); 6164 return; 6165 } 6166 6167 const VarDecl* PrevInit = 0; 6168 if (getLangOptions().CPlusPlus) { 6169 // C++ [class.static.data]p4 6170 // If a static data member is of const integral or const 6171 // enumeration type, its declaration in the class definition can 6172 // specify a constant-initializer which shall be an integral 6173 // constant expression (5.19). In that case, the member can appear 6174 // in integral constant expressions. The member shall still be 6175 // defined in a namespace scope if it is used in the program and the 6176 // namespace scope definition shall not contain an initializer. 6177 // 6178 // We already performed a redefinition check above, but for static 6179 // data members we also need to check whether there was an in-class 6180 // declaration with an initializer. 6181 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6182 Diag(VDecl->getLocation(), diag::err_redefinition) 6183 << VDecl->getDeclName(); 6184 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6185 return; 6186 } 6187 6188 if (VDecl->hasLocalStorage()) 6189 getCurFunction()->setHasBranchProtectedScope(); 6190 6191 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6192 VDecl->setInvalidDecl(); 6193 return; 6194 } 6195 } 6196 6197 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6198 // a kernel function cannot be initialized." 6199 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6200 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6201 VDecl->setInvalidDecl(); 6202 return; 6203 } 6204 6205 // Get the decls type and save a reference for later, since 6206 // CheckInitializerTypes may change it. 6207 QualType DclT = VDecl->getType(), SavT = DclT; 6208 6209 // Perform the initialization. 6210 if (!VDecl->isInvalidDecl()) { 6211 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6212 InitializationKind Kind 6213 = DirectInit ? 6214 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6215 Init->getLocStart(), 6216 Init->getLocEnd()) 6217 : InitializationKind::CreateDirectList( 6218 VDecl->getLocation()) 6219 : InitializationKind::CreateCopy(VDecl->getLocation(), 6220 Init->getLocStart()); 6221 6222 Expr **Args = &Init; 6223 unsigned NumArgs = 1; 6224 if (CXXDirectInit) { 6225 Args = CXXDirectInit->getExprs(); 6226 NumArgs = CXXDirectInit->getNumExprs(); 6227 } 6228 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs); 6229 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6230 MultiExprArg(*this, Args,NumArgs), 6231 &DclT); 6232 if (Result.isInvalid()) { 6233 VDecl->setInvalidDecl(); 6234 return; 6235 } 6236 6237 Init = Result.takeAs<Expr>(); 6238 } 6239 6240 // If the type changed, it means we had an incomplete type that was 6241 // completed by the initializer. For example: 6242 // int ary[] = { 1, 3, 5 }; 6243 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6244 if (!VDecl->isInvalidDecl() && (DclT != SavT)) 6245 VDecl->setType(DclT); 6246 6247 // Check any implicit conversions within the expression. 6248 CheckImplicitConversions(Init, VDecl->getLocation()); 6249 6250 if (!VDecl->isInvalidDecl()) 6251 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6252 6253 Init = MaybeCreateExprWithCleanups(Init); 6254 // Attach the initializer to the decl. 6255 VDecl->setInit(Init); 6256 6257 if (VDecl->isLocalVarDecl()) { 6258 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6259 // static storage duration shall be constant expressions or string literals. 6260 // C++ does not have this restriction. 6261 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl() && 6262 VDecl->getStorageClass() == SC_Static) 6263 CheckForConstantInitializer(Init, DclT); 6264 } else if (VDecl->isStaticDataMember() && 6265 VDecl->getLexicalDeclContext()->isRecord()) { 6266 // This is an in-class initialization for a static data member, e.g., 6267 // 6268 // struct S { 6269 // static const int value = 17; 6270 // }; 6271 6272 // C++ [class.mem]p4: 6273 // A member-declarator can contain a constant-initializer only 6274 // if it declares a static member (9.4) of const integral or 6275 // const enumeration type, see 9.4.2. 6276 // 6277 // C++11 [class.static.data]p3: 6278 // If a non-volatile const static data member is of integral or 6279 // enumeration type, its declaration in the class definition can 6280 // specify a brace-or-equal-initializer in which every initalizer-clause 6281 // that is an assignment-expression is a constant expression. A static 6282 // data member of literal type can be declared in the class definition 6283 // with the constexpr specifier; if so, its declaration shall specify a 6284 // brace-or-equal-initializer in which every initializer-clause that is 6285 // an assignment-expression is a constant expression. 6286 6287 // Do nothing on dependent types. 6288 if (DclT->isDependentType()) { 6289 6290 // Allow any 'static constexpr' members, whether or not they are of literal 6291 // type. We separately check that every constexpr variable is of literal 6292 // type. 6293 } else if (VDecl->isConstexpr()) { 6294 6295 // Require constness. 6296 } else if (!DclT.isConstQualified()) { 6297 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6298 << Init->getSourceRange(); 6299 VDecl->setInvalidDecl(); 6300 6301 // We allow integer constant expressions in all cases. 6302 } else if (DclT->isIntegralOrEnumerationType()) { 6303 // Check whether the expression is a constant expression. 6304 SourceLocation Loc; 6305 if (getLangOptions().CPlusPlus0x && DclT.isVolatileQualified()) 6306 // In C++11, a non-constexpr const static data member with an 6307 // in-class initializer cannot be volatile. 6308 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6309 else if (Init->isValueDependent()) 6310 ; // Nothing to check. 6311 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6312 ; // Ok, it's an ICE! 6313 else if (Init->isEvaluatable(Context)) { 6314 // If we can constant fold the initializer through heroics, accept it, 6315 // but report this as a use of an extension for -pedantic. 6316 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6317 << Init->getSourceRange(); 6318 } else { 6319 // Otherwise, this is some crazy unknown case. Report the issue at the 6320 // location provided by the isIntegerConstantExpr failed check. 6321 Diag(Loc, diag::err_in_class_initializer_non_constant) 6322 << Init->getSourceRange(); 6323 VDecl->setInvalidDecl(); 6324 } 6325 6326 // We allow foldable floating-point constants as an extension. 6327 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6328 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6329 << DclT << Init->getSourceRange(); 6330 if (getLangOptions().CPlusPlus0x) 6331 Diag(VDecl->getLocation(), 6332 diag::note_in_class_initializer_float_type_constexpr) 6333 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6334 6335 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6336 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6337 << Init->getSourceRange(); 6338 VDecl->setInvalidDecl(); 6339 } 6340 6341 // Suggest adding 'constexpr' in C++11 for literal types. 6342 } else if (getLangOptions().CPlusPlus0x && DclT->isLiteralType()) { 6343 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6344 << DclT << Init->getSourceRange() 6345 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6346 VDecl->setConstexpr(true); 6347 6348 } else { 6349 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6350 << DclT << Init->getSourceRange(); 6351 VDecl->setInvalidDecl(); 6352 } 6353 } else if (VDecl->isFileVarDecl()) { 6354 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6355 (!getLangOptions().CPlusPlus || 6356 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6357 Diag(VDecl->getLocation(), diag::warn_extern_init); 6358 6359 // C99 6.7.8p4. All file scoped initializers need to be constant. 6360 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) 6361 CheckForConstantInitializer(Init, DclT); 6362 } 6363 6364 // We will represent direct-initialization similarly to copy-initialization: 6365 // int x(1); -as-> int x = 1; 6366 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6367 // 6368 // Clients that want to distinguish between the two forms, can check for 6369 // direct initializer using VarDecl::getInitStyle(). 6370 // A major benefit is that clients that don't particularly care about which 6371 // exactly form was it (like the CodeGen) can handle both cases without 6372 // special case code. 6373 6374 // C++ 8.5p11: 6375 // The form of initialization (using parentheses or '=') is generally 6376 // insignificant, but does matter when the entity being initialized has a 6377 // class type. 6378 if (CXXDirectInit) { 6379 assert(DirectInit && "Call-style initializer must be direct init."); 6380 VDecl->setInitStyle(VarDecl::CallInit); 6381 } else if (DirectInit) { 6382 // This must be list-initialization. No other way is direct-initialization. 6383 VDecl->setInitStyle(VarDecl::ListInit); 6384 } 6385 6386 CheckCompleteVariableDeclaration(VDecl); 6387} 6388 6389/// ActOnInitializerError - Given that there was an error parsing an 6390/// initializer for the given declaration, try to return to some form 6391/// of sanity. 6392void Sema::ActOnInitializerError(Decl *D) { 6393 // Our main concern here is re-establishing invariants like "a 6394 // variable's type is either dependent or complete". 6395 if (!D || D->isInvalidDecl()) return; 6396 6397 VarDecl *VD = dyn_cast<VarDecl>(D); 6398 if (!VD) return; 6399 6400 // Auto types are meaningless if we can't make sense of the initializer. 6401 if (ParsingInitForAutoVars.count(D)) { 6402 D->setInvalidDecl(); 6403 return; 6404 } 6405 6406 QualType Ty = VD->getType(); 6407 if (Ty->isDependentType()) return; 6408 6409 // Require a complete type. 6410 if (RequireCompleteType(VD->getLocation(), 6411 Context.getBaseElementType(Ty), 6412 diag::err_typecheck_decl_incomplete_type)) { 6413 VD->setInvalidDecl(); 6414 return; 6415 } 6416 6417 // Require an abstract type. 6418 if (RequireNonAbstractType(VD->getLocation(), Ty, 6419 diag::err_abstract_type_in_decl, 6420 AbstractVariableType)) { 6421 VD->setInvalidDecl(); 6422 return; 6423 } 6424 6425 // Don't bother complaining about constructors or destructors, 6426 // though. 6427} 6428 6429void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6430 bool TypeMayContainAuto) { 6431 // If there is no declaration, there was an error parsing it. Just ignore it. 6432 if (RealDecl == 0) 6433 return; 6434 6435 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6436 QualType Type = Var->getType(); 6437 6438 // C++11 [dcl.spec.auto]p3 6439 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6440 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6441 << Var->getDeclName() << Type; 6442 Var->setInvalidDecl(); 6443 return; 6444 } 6445 6446 // C++11 [class.static.data]p3: A static data member can be declared with 6447 // the constexpr specifier; if so, its declaration shall specify 6448 // a brace-or-equal-initializer. 6449 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6450 // the definition of a variable [...] or the declaration of a static data 6451 // member. 6452 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6453 if (Var->isStaticDataMember()) 6454 Diag(Var->getLocation(), 6455 diag::err_constexpr_static_mem_var_requires_init) 6456 << Var->getDeclName(); 6457 else 6458 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6459 Var->setInvalidDecl(); 6460 return; 6461 } 6462 6463 switch (Var->isThisDeclarationADefinition()) { 6464 case VarDecl::Definition: 6465 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6466 break; 6467 6468 // We have an out-of-line definition of a static data member 6469 // that has an in-class initializer, so we type-check this like 6470 // a declaration. 6471 // 6472 // Fall through 6473 6474 case VarDecl::DeclarationOnly: 6475 // It's only a declaration. 6476 6477 // Block scope. C99 6.7p7: If an identifier for an object is 6478 // declared with no linkage (C99 6.2.2p6), the type for the 6479 // object shall be complete. 6480 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6481 !Var->getLinkage() && !Var->isInvalidDecl() && 6482 RequireCompleteType(Var->getLocation(), Type, 6483 diag::err_typecheck_decl_incomplete_type)) 6484 Var->setInvalidDecl(); 6485 6486 // Make sure that the type is not abstract. 6487 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6488 RequireNonAbstractType(Var->getLocation(), Type, 6489 diag::err_abstract_type_in_decl, 6490 AbstractVariableType)) 6491 Var->setInvalidDecl(); 6492 return; 6493 6494 case VarDecl::TentativeDefinition: 6495 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6496 // object that has file scope without an initializer, and without a 6497 // storage-class specifier or with the storage-class specifier "static", 6498 // constitutes a tentative definition. Note: A tentative definition with 6499 // external linkage is valid (C99 6.2.2p5). 6500 if (!Var->isInvalidDecl()) { 6501 if (const IncompleteArrayType *ArrayT 6502 = Context.getAsIncompleteArrayType(Type)) { 6503 if (RequireCompleteType(Var->getLocation(), 6504 ArrayT->getElementType(), 6505 diag::err_illegal_decl_array_incomplete_type)) 6506 Var->setInvalidDecl(); 6507 } else if (Var->getStorageClass() == SC_Static) { 6508 // C99 6.9.2p3: If the declaration of an identifier for an object is 6509 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6510 // declared type shall not be an incomplete type. 6511 // NOTE: code such as the following 6512 // static struct s; 6513 // struct s { int a; }; 6514 // is accepted by gcc. Hence here we issue a warning instead of 6515 // an error and we do not invalidate the static declaration. 6516 // NOTE: to avoid multiple warnings, only check the first declaration. 6517 if (Var->getPreviousDecl() == 0) 6518 RequireCompleteType(Var->getLocation(), Type, 6519 diag::ext_typecheck_decl_incomplete_type); 6520 } 6521 } 6522 6523 // Record the tentative definition; we're done. 6524 if (!Var->isInvalidDecl()) 6525 TentativeDefinitions.push_back(Var); 6526 return; 6527 } 6528 6529 // Provide a specific diagnostic for uninitialized variable 6530 // definitions with incomplete array type. 6531 if (Type->isIncompleteArrayType()) { 6532 Diag(Var->getLocation(), 6533 diag::err_typecheck_incomplete_array_needs_initializer); 6534 Var->setInvalidDecl(); 6535 return; 6536 } 6537 6538 // Provide a specific diagnostic for uninitialized variable 6539 // definitions with reference type. 6540 if (Type->isReferenceType()) { 6541 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6542 << Var->getDeclName() 6543 << SourceRange(Var->getLocation(), Var->getLocation()); 6544 Var->setInvalidDecl(); 6545 return; 6546 } 6547 6548 // Do not attempt to type-check the default initializer for a 6549 // variable with dependent type. 6550 if (Type->isDependentType()) 6551 return; 6552 6553 if (Var->isInvalidDecl()) 6554 return; 6555 6556 if (RequireCompleteType(Var->getLocation(), 6557 Context.getBaseElementType(Type), 6558 diag::err_typecheck_decl_incomplete_type)) { 6559 Var->setInvalidDecl(); 6560 return; 6561 } 6562 6563 // The variable can not have an abstract class type. 6564 if (RequireNonAbstractType(Var->getLocation(), Type, 6565 diag::err_abstract_type_in_decl, 6566 AbstractVariableType)) { 6567 Var->setInvalidDecl(); 6568 return; 6569 } 6570 6571 // Check for jumps past the implicit initializer. C++0x 6572 // clarifies that this applies to a "variable with automatic 6573 // storage duration", not a "local variable". 6574 // C++11 [stmt.dcl]p3 6575 // A program that jumps from a point where a variable with automatic 6576 // storage duration is not in scope to a point where it is in scope is 6577 // ill-formed unless the variable has scalar type, class type with a 6578 // trivial default constructor and a trivial destructor, a cv-qualified 6579 // version of one of these types, or an array of one of the preceding 6580 // types and is declared without an initializer. 6581 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6582 if (const RecordType *Record 6583 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6584 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6585 // Mark the function for further checking even if the looser rules of 6586 // C++11 do not require such checks, so that we can diagnose 6587 // incompatibilities with C++98. 6588 if (!CXXRecord->isPOD()) 6589 getCurFunction()->setHasBranchProtectedScope(); 6590 } 6591 } 6592 6593 // C++03 [dcl.init]p9: 6594 // If no initializer is specified for an object, and the 6595 // object is of (possibly cv-qualified) non-POD class type (or 6596 // array thereof), the object shall be default-initialized; if 6597 // the object is of const-qualified type, the underlying class 6598 // type shall have a user-declared default 6599 // constructor. Otherwise, if no initializer is specified for 6600 // a non- static object, the object and its subobjects, if 6601 // any, have an indeterminate initial value); if the object 6602 // or any of its subobjects are of const-qualified type, the 6603 // program is ill-formed. 6604 // C++0x [dcl.init]p11: 6605 // If no initializer is specified for an object, the object is 6606 // default-initialized; [...]. 6607 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6608 InitializationKind Kind 6609 = InitializationKind::CreateDefault(Var->getLocation()); 6610 6611 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6612 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6613 MultiExprArg(*this, 0, 0)); 6614 if (Init.isInvalid()) 6615 Var->setInvalidDecl(); 6616 else if (Init.get()) { 6617 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6618 // This is important for template substitution. 6619 Var->setInitStyle(VarDecl::CallInit); 6620 } 6621 6622 CheckCompleteVariableDeclaration(Var); 6623 } 6624} 6625 6626void Sema::ActOnCXXForRangeDecl(Decl *D) { 6627 VarDecl *VD = dyn_cast<VarDecl>(D); 6628 if (!VD) { 6629 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6630 D->setInvalidDecl(); 6631 return; 6632 } 6633 6634 VD->setCXXForRangeDecl(true); 6635 6636 // for-range-declaration cannot be given a storage class specifier. 6637 int Error = -1; 6638 switch (VD->getStorageClassAsWritten()) { 6639 case SC_None: 6640 break; 6641 case SC_Extern: 6642 Error = 0; 6643 break; 6644 case SC_Static: 6645 Error = 1; 6646 break; 6647 case SC_PrivateExtern: 6648 Error = 2; 6649 break; 6650 case SC_Auto: 6651 Error = 3; 6652 break; 6653 case SC_Register: 6654 Error = 4; 6655 break; 6656 case SC_OpenCLWorkGroupLocal: 6657 llvm_unreachable("Unexpected storage class"); 6658 } 6659 if (VD->isConstexpr()) 6660 Error = 5; 6661 if (Error != -1) { 6662 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6663 << VD->getDeclName() << Error; 6664 D->setInvalidDecl(); 6665 } 6666} 6667 6668void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6669 if (var->isInvalidDecl()) return; 6670 6671 // In ARC, don't allow jumps past the implicit initialization of a 6672 // local retaining variable. 6673 if (getLangOptions().ObjCAutoRefCount && 6674 var->hasLocalStorage()) { 6675 switch (var->getType().getObjCLifetime()) { 6676 case Qualifiers::OCL_None: 6677 case Qualifiers::OCL_ExplicitNone: 6678 case Qualifiers::OCL_Autoreleasing: 6679 break; 6680 6681 case Qualifiers::OCL_Weak: 6682 case Qualifiers::OCL_Strong: 6683 getCurFunction()->setHasBranchProtectedScope(); 6684 break; 6685 } 6686 } 6687 6688 // All the following checks are C++ only. 6689 if (!getLangOptions().CPlusPlus) return; 6690 6691 QualType baseType = Context.getBaseElementType(var->getType()); 6692 if (baseType->isDependentType()) return; 6693 6694 // __block variables might require us to capture a copy-initializer. 6695 if (var->hasAttr<BlocksAttr>()) { 6696 // It's currently invalid to ever have a __block variable with an 6697 // array type; should we diagnose that here? 6698 6699 // Regardless, we don't want to ignore array nesting when 6700 // constructing this copy. 6701 QualType type = var->getType(); 6702 6703 if (type->isStructureOrClassType()) { 6704 SourceLocation poi = var->getLocation(); 6705 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6706 ExprResult result = 6707 PerformCopyInitialization( 6708 InitializedEntity::InitializeBlock(poi, type, false), 6709 poi, Owned(varRef)); 6710 if (!result.isInvalid()) { 6711 result = MaybeCreateExprWithCleanups(result); 6712 Expr *init = result.takeAs<Expr>(); 6713 Context.setBlockVarCopyInits(var, init); 6714 } 6715 } 6716 } 6717 6718 Expr *Init = var->getInit(); 6719 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6720 6721 if (!var->getDeclContext()->isDependentContext() && Init) { 6722 if (IsGlobal && !var->isConstexpr() && 6723 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6724 var->getLocation()) 6725 != DiagnosticsEngine::Ignored && 6726 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6727 Diag(var->getLocation(), diag::warn_global_constructor) 6728 << Init->getSourceRange(); 6729 6730 if (var->isConstexpr()) { 6731 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6732 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6733 SourceLocation DiagLoc = var->getLocation(); 6734 // If the note doesn't add any useful information other than a source 6735 // location, fold it into the primary diagnostic. 6736 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6737 diag::note_invalid_subexpr_in_const_expr) { 6738 DiagLoc = Notes[0].first; 6739 Notes.clear(); 6740 } 6741 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6742 << var << Init->getSourceRange(); 6743 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6744 Diag(Notes[I].first, Notes[I].second); 6745 } 6746 } else if (var->isUsableInConstantExpressions()) { 6747 // Check whether the initializer of a const variable of integral or 6748 // enumeration type is an ICE now, since we can't tell whether it was 6749 // initialized by a constant expression if we check later. 6750 var->checkInitIsICE(); 6751 } 6752 } 6753 6754 // Require the destructor. 6755 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6756 FinalizeVarWithDestructor(var, recordType); 6757} 6758 6759/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6760/// any semantic actions necessary after any initializer has been attached. 6761void 6762Sema::FinalizeDeclaration(Decl *ThisDecl) { 6763 // Note that we are no longer parsing the initializer for this declaration. 6764 ParsingInitForAutoVars.erase(ThisDecl); 6765} 6766 6767Sema::DeclGroupPtrTy 6768Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6769 Decl **Group, unsigned NumDecls) { 6770 SmallVector<Decl*, 8> Decls; 6771 6772 if (DS.isTypeSpecOwned()) 6773 Decls.push_back(DS.getRepAsDecl()); 6774 6775 for (unsigned i = 0; i != NumDecls; ++i) 6776 if (Decl *D = Group[i]) 6777 Decls.push_back(D); 6778 6779 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6780 DS.getTypeSpecType() == DeclSpec::TST_auto); 6781} 6782 6783/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6784/// group, performing any necessary semantic checking. 6785Sema::DeclGroupPtrTy 6786Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6787 bool TypeMayContainAuto) { 6788 // C++0x [dcl.spec.auto]p7: 6789 // If the type deduced for the template parameter U is not the same in each 6790 // deduction, the program is ill-formed. 6791 // FIXME: When initializer-list support is added, a distinction is needed 6792 // between the deduced type U and the deduced type which 'auto' stands for. 6793 // auto a = 0, b = { 1, 2, 3 }; 6794 // is legal because the deduced type U is 'int' in both cases. 6795 if (TypeMayContainAuto && NumDecls > 1) { 6796 QualType Deduced; 6797 CanQualType DeducedCanon; 6798 VarDecl *DeducedDecl = 0; 6799 for (unsigned i = 0; i != NumDecls; ++i) { 6800 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6801 AutoType *AT = D->getType()->getContainedAutoType(); 6802 // Don't reissue diagnostics when instantiating a template. 6803 if (AT && D->isInvalidDecl()) 6804 break; 6805 if (AT && AT->isDeduced()) { 6806 QualType U = AT->getDeducedType(); 6807 CanQualType UCanon = Context.getCanonicalType(U); 6808 if (Deduced.isNull()) { 6809 Deduced = U; 6810 DeducedCanon = UCanon; 6811 DeducedDecl = D; 6812 } else if (DeducedCanon != UCanon) { 6813 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6814 diag::err_auto_different_deductions) 6815 << Deduced << DeducedDecl->getDeclName() 6816 << U << D->getDeclName() 6817 << DeducedDecl->getInit()->getSourceRange() 6818 << D->getInit()->getSourceRange(); 6819 D->setInvalidDecl(); 6820 break; 6821 } 6822 } 6823 } 6824 } 6825 } 6826 6827 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6828} 6829 6830 6831/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6832/// to introduce parameters into function prototype scope. 6833Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6834 const DeclSpec &DS = D.getDeclSpec(); 6835 6836 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6837 // C++03 [dcl.stc]p2 also permits 'auto'. 6838 VarDecl::StorageClass StorageClass = SC_None; 6839 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6840 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6841 StorageClass = SC_Register; 6842 StorageClassAsWritten = SC_Register; 6843 } else if (getLangOptions().CPlusPlus && 6844 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6845 StorageClass = SC_Auto; 6846 StorageClassAsWritten = SC_Auto; 6847 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6848 Diag(DS.getStorageClassSpecLoc(), 6849 diag::err_invalid_storage_class_in_func_decl); 6850 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6851 } 6852 6853 if (D.getDeclSpec().isThreadSpecified()) 6854 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6855 if (D.getDeclSpec().isConstexprSpecified()) 6856 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6857 << 0; 6858 6859 DiagnoseFunctionSpecifiers(D); 6860 6861 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6862 QualType parmDeclType = TInfo->getType(); 6863 6864 if (getLangOptions().CPlusPlus) { 6865 // Check that there are no default arguments inside the type of this 6866 // parameter. 6867 CheckExtraCXXDefaultArguments(D); 6868 6869 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6870 if (D.getCXXScopeSpec().isSet()) { 6871 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6872 << D.getCXXScopeSpec().getRange(); 6873 D.getCXXScopeSpec().clear(); 6874 } 6875 } 6876 6877 // Ensure we have a valid name 6878 IdentifierInfo *II = 0; 6879 if (D.hasName()) { 6880 II = D.getIdentifier(); 6881 if (!II) { 6882 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6883 << GetNameForDeclarator(D).getName().getAsString(); 6884 D.setInvalidType(true); 6885 } 6886 } 6887 6888 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6889 if (II) { 6890 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6891 ForRedeclaration); 6892 LookupName(R, S); 6893 if (R.isSingleResult()) { 6894 NamedDecl *PrevDecl = R.getFoundDecl(); 6895 if (PrevDecl->isTemplateParameter()) { 6896 // Maybe we will complain about the shadowed template parameter. 6897 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6898 // Just pretend that we didn't see the previous declaration. 6899 PrevDecl = 0; 6900 } else if (S->isDeclScope(PrevDecl)) { 6901 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6902 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6903 6904 // Recover by removing the name 6905 II = 0; 6906 D.SetIdentifier(0, D.getIdentifierLoc()); 6907 D.setInvalidType(true); 6908 } 6909 } 6910 } 6911 6912 // Temporarily put parameter variables in the translation unit, not 6913 // the enclosing context. This prevents them from accidentally 6914 // looking like class members in C++. 6915 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6916 D.getSourceRange().getBegin(), 6917 D.getIdentifierLoc(), II, 6918 parmDeclType, TInfo, 6919 StorageClass, StorageClassAsWritten); 6920 6921 if (D.isInvalidType()) 6922 New->setInvalidDecl(); 6923 6924 assert(S->isFunctionPrototypeScope()); 6925 assert(S->getFunctionPrototypeDepth() >= 1); 6926 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6927 S->getNextFunctionPrototypeIndex()); 6928 6929 // Add the parameter declaration into this scope. 6930 S->AddDecl(New); 6931 if (II) 6932 IdResolver.AddDecl(New); 6933 6934 ProcessDeclAttributes(S, New, D); 6935 6936 if (D.getDeclSpec().isModulePrivateSpecified()) 6937 Diag(New->getLocation(), diag::err_module_private_local) 6938 << 1 << New->getDeclName() 6939 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6940 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6941 6942 if (New->hasAttr<BlocksAttr>()) { 6943 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6944 } 6945 return New; 6946} 6947 6948/// \brief Synthesizes a variable for a parameter arising from a 6949/// typedef. 6950ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6951 SourceLocation Loc, 6952 QualType T) { 6953 /* FIXME: setting StartLoc == Loc. 6954 Would it be worth to modify callers so as to provide proper source 6955 location for the unnamed parameters, embedding the parameter's type? */ 6956 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6957 T, Context.getTrivialTypeSourceInfo(T, Loc), 6958 SC_None, SC_None, 0); 6959 Param->setImplicit(); 6960 return Param; 6961} 6962 6963void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6964 ParmVarDecl * const *ParamEnd) { 6965 // Don't diagnose unused-parameter errors in template instantiations; we 6966 // will already have done so in the template itself. 6967 if (!ActiveTemplateInstantiations.empty()) 6968 return; 6969 6970 for (; Param != ParamEnd; ++Param) { 6971 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 6972 !(*Param)->hasAttr<UnusedAttr>()) { 6973 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6974 << (*Param)->getDeclName(); 6975 } 6976 } 6977} 6978 6979void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6980 ParmVarDecl * const *ParamEnd, 6981 QualType ReturnTy, 6982 NamedDecl *D) { 6983 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6984 return; 6985 6986 // Warn if the return value is pass-by-value and larger than the specified 6987 // threshold. 6988 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 6989 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6990 if (Size > LangOpts.NumLargeByValueCopy) 6991 Diag(D->getLocation(), diag::warn_return_value_size) 6992 << D->getDeclName() << Size; 6993 } 6994 6995 // Warn if any parameter is pass-by-value and larger than the specified 6996 // threshold. 6997 for (; Param != ParamEnd; ++Param) { 6998 QualType T = (*Param)->getType(); 6999 if (T->isDependentType() || !T.isPODType(Context)) 7000 continue; 7001 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 7002 if (Size > LangOpts.NumLargeByValueCopy) 7003 Diag((*Param)->getLocation(), diag::warn_parameter_size) 7004 << (*Param)->getDeclName() << Size; 7005 } 7006} 7007 7008ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 7009 SourceLocation NameLoc, IdentifierInfo *Name, 7010 QualType T, TypeSourceInfo *TSInfo, 7011 VarDecl::StorageClass StorageClass, 7012 VarDecl::StorageClass StorageClassAsWritten) { 7013 // In ARC, infer a lifetime qualifier for appropriate parameter types. 7014 if (getLangOptions().ObjCAutoRefCount && 7015 T.getObjCLifetime() == Qualifiers::OCL_None && 7016 T->isObjCLifetimeType()) { 7017 7018 Qualifiers::ObjCLifetime lifetime; 7019 7020 // Special cases for arrays: 7021 // - if it's const, use __unsafe_unretained 7022 // - otherwise, it's an error 7023 if (T->isArrayType()) { 7024 if (!T.isConstQualified()) { 7025 DelayedDiagnostics.add( 7026 sema::DelayedDiagnostic::makeForbiddenType( 7027 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 7028 } 7029 lifetime = Qualifiers::OCL_ExplicitNone; 7030 } else { 7031 lifetime = T->getObjCARCImplicitLifetime(); 7032 } 7033 T = Context.getLifetimeQualifiedType(T, lifetime); 7034 } 7035 7036 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 7037 Context.getAdjustedParameterType(T), 7038 TSInfo, 7039 StorageClass, StorageClassAsWritten, 7040 0); 7041 7042 // Parameters can not be abstract class types. 7043 // For record types, this is done by the AbstractClassUsageDiagnoser once 7044 // the class has been completely parsed. 7045 if (!CurContext->isRecord() && 7046 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 7047 AbstractParamType)) 7048 New->setInvalidDecl(); 7049 7050 // Parameter declarators cannot be interface types. All ObjC objects are 7051 // passed by reference. 7052 if (T->isObjCObjectType()) { 7053 Diag(NameLoc, 7054 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 7055 << FixItHint::CreateInsertion(NameLoc, "*"); 7056 T = Context.getObjCObjectPointerType(T); 7057 New->setType(T); 7058 } 7059 7060 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 7061 // duration shall not be qualified by an address-space qualifier." 7062 // Since all parameters have automatic store duration, they can not have 7063 // an address space. 7064 if (T.getAddressSpace() != 0) { 7065 Diag(NameLoc, diag::err_arg_with_address_space); 7066 New->setInvalidDecl(); 7067 } 7068 7069 return New; 7070} 7071 7072void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 7073 SourceLocation LocAfterDecls) { 7074 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 7075 7076 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 7077 // for a K&R function. 7078 if (!FTI.hasPrototype) { 7079 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 7080 --i; 7081 if (FTI.ArgInfo[i].Param == 0) { 7082 SmallString<256> Code; 7083 llvm::raw_svector_ostream(Code) << " int " 7084 << FTI.ArgInfo[i].Ident->getName() 7085 << ";\n"; 7086 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 7087 << FTI.ArgInfo[i].Ident 7088 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 7089 7090 // Implicitly declare the argument as type 'int' for lack of a better 7091 // type. 7092 AttributeFactory attrs; 7093 DeclSpec DS(attrs); 7094 const char* PrevSpec; // unused 7095 unsigned DiagID; // unused 7096 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 7097 PrevSpec, DiagID); 7098 Declarator ParamD(DS, Declarator::KNRTypeListContext); 7099 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 7100 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 7101 } 7102 } 7103 } 7104} 7105 7106Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 7107 Declarator &D) { 7108 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 7109 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 7110 Scope *ParentScope = FnBodyScope->getParent(); 7111 7112 D.setFunctionDefinitionKind(FDK_Definition); 7113 Decl *DP = HandleDeclarator(ParentScope, D, 7114 MultiTemplateParamsArg(*this)); 7115 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7116} 7117 7118static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7119 // Don't warn about invalid declarations. 7120 if (FD->isInvalidDecl()) 7121 return false; 7122 7123 // Or declarations that aren't global. 7124 if (!FD->isGlobal()) 7125 return false; 7126 7127 // Don't warn about C++ member functions. 7128 if (isa<CXXMethodDecl>(FD)) 7129 return false; 7130 7131 // Don't warn about 'main'. 7132 if (FD->isMain()) 7133 return false; 7134 7135 // Don't warn about inline functions. 7136 if (FD->isInlined()) 7137 return false; 7138 7139 // Don't warn about function templates. 7140 if (FD->getDescribedFunctionTemplate()) 7141 return false; 7142 7143 // Don't warn about function template specializations. 7144 if (FD->isFunctionTemplateSpecialization()) 7145 return false; 7146 7147 bool MissingPrototype = true; 7148 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7149 Prev; Prev = Prev->getPreviousDecl()) { 7150 // Ignore any declarations that occur in function or method 7151 // scope, because they aren't visible from the header. 7152 if (Prev->getDeclContext()->isFunctionOrMethod()) 7153 continue; 7154 7155 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7156 break; 7157 } 7158 7159 return MissingPrototype; 7160} 7161 7162void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7163 // Don't complain if we're in GNU89 mode and the previous definition 7164 // was an extern inline function. 7165 const FunctionDecl *Definition; 7166 if (FD->isDefined(Definition) && 7167 !canRedefineFunction(Definition, getLangOptions())) { 7168 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 7169 Definition->getStorageClass() == SC_Extern) 7170 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7171 << FD->getDeclName() << getLangOptions().CPlusPlus; 7172 else 7173 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7174 Diag(Definition->getLocation(), diag::note_previous_definition); 7175 } 7176} 7177 7178Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7179 // Clear the last template instantiation error context. 7180 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7181 7182 if (!D) 7183 return D; 7184 FunctionDecl *FD = 0; 7185 7186 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7187 FD = FunTmpl->getTemplatedDecl(); 7188 else 7189 FD = cast<FunctionDecl>(D); 7190 7191 // Enter a new function scope 7192 PushFunctionScope(); 7193 7194 // See if this is a redefinition. 7195 if (!FD->isLateTemplateParsed()) 7196 CheckForFunctionRedefinition(FD); 7197 7198 // Builtin functions cannot be defined. 7199 if (unsigned BuiltinID = FD->getBuiltinID()) { 7200 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7201 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7202 FD->setInvalidDecl(); 7203 } 7204 } 7205 7206 // The return type of a function definition must be complete 7207 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7208 QualType ResultType = FD->getResultType(); 7209 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7210 !FD->isInvalidDecl() && 7211 RequireCompleteType(FD->getLocation(), ResultType, 7212 diag::err_func_def_incomplete_result)) 7213 FD->setInvalidDecl(); 7214 7215 // GNU warning -Wmissing-prototypes: 7216 // Warn if a global function is defined without a previous 7217 // prototype declaration. This warning is issued even if the 7218 // definition itself provides a prototype. The aim is to detect 7219 // global functions that fail to be declared in header files. 7220 if (ShouldWarnAboutMissingPrototype(FD)) 7221 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7222 7223 if (FnBodyScope) 7224 PushDeclContext(FnBodyScope, FD); 7225 7226 // Check the validity of our function parameters 7227 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7228 /*CheckParameterNames=*/true); 7229 7230 // Introduce our parameters into the function scope 7231 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7232 ParmVarDecl *Param = FD->getParamDecl(p); 7233 Param->setOwningFunction(FD); 7234 7235 // If this has an identifier, add it to the scope stack. 7236 if (Param->getIdentifier() && FnBodyScope) { 7237 CheckShadow(FnBodyScope, Param); 7238 7239 PushOnScopeChains(Param, FnBodyScope); 7240 } 7241 } 7242 7243 // If we had any tags defined in the function prototype, 7244 // introduce them into the function scope. 7245 if (FnBodyScope) { 7246 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(), 7247 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) { 7248 NamedDecl *D = *I; 7249 7250 // Some of these decls (like enums) may have been pinned to the translation unit 7251 // for lack of a real context earlier. If so, remove from the translation unit 7252 // and reattach to the current context. 7253 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) { 7254 // Is the decl actually in the context? 7255 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(), 7256 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) { 7257 if (*DI == D) { 7258 Context.getTranslationUnitDecl()->removeDecl(D); 7259 break; 7260 } 7261 } 7262 // Either way, reassign the lexical decl context to our FunctionDecl. 7263 D->setLexicalDeclContext(CurContext); 7264 } 7265 7266 // If the decl has a non-null name, make accessible in the current scope. 7267 if (!D->getName().empty()) 7268 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false); 7269 7270 // Similarly, dive into enums and fish their constants out, making them 7271 // accessible in this scope. 7272 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) { 7273 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(), 7274 EE = ED->enumerator_end(); EI != EE; ++EI) 7275 PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false); 7276 } 7277 } 7278 } 7279 7280 // Checking attributes of current function definition 7281 // dllimport attribute. 7282 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7283 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7284 // dllimport attribute cannot be directly applied to definition. 7285 // Microsoft accepts dllimport for functions defined within class scope. 7286 if (!DA->isInherited() && 7287 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7288 Diag(FD->getLocation(), 7289 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7290 << "dllimport"; 7291 FD->setInvalidDecl(); 7292 return FD; 7293 } 7294 7295 // Visual C++ appears to not think this is an issue, so only issue 7296 // a warning when Microsoft extensions are disabled. 7297 if (!LangOpts.MicrosoftExt) { 7298 // If a symbol previously declared dllimport is later defined, the 7299 // attribute is ignored in subsequent references, and a warning is 7300 // emitted. 7301 Diag(FD->getLocation(), 7302 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7303 << FD->getName() << "dllimport"; 7304 } 7305 } 7306 return FD; 7307} 7308 7309/// \brief Given the set of return statements within a function body, 7310/// compute the variables that are subject to the named return value 7311/// optimization. 7312/// 7313/// Each of the variables that is subject to the named return value 7314/// optimization will be marked as NRVO variables in the AST, and any 7315/// return statement that has a marked NRVO variable as its NRVO candidate can 7316/// use the named return value optimization. 7317/// 7318/// This function applies a very simplistic algorithm for NRVO: if every return 7319/// statement in the function has the same NRVO candidate, that candidate is 7320/// the NRVO variable. 7321/// 7322/// FIXME: Employ a smarter algorithm that accounts for multiple return 7323/// statements and the lifetimes of the NRVO candidates. We should be able to 7324/// find a maximal set of NRVO variables. 7325void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7326 ReturnStmt **Returns = Scope->Returns.data(); 7327 7328 const VarDecl *NRVOCandidate = 0; 7329 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7330 if (!Returns[I]->getNRVOCandidate()) 7331 return; 7332 7333 if (!NRVOCandidate) 7334 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7335 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7336 return; 7337 } 7338 7339 if (NRVOCandidate) 7340 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7341} 7342 7343Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7344 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7345} 7346 7347Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7348 bool IsInstantiation) { 7349 FunctionDecl *FD = 0; 7350 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7351 if (FunTmpl) 7352 FD = FunTmpl->getTemplatedDecl(); 7353 else 7354 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7355 7356 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7357 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7358 7359 if (FD) { 7360 FD->setBody(Body); 7361 7362 // If the function implicitly returns zero (like 'main') or is naked, 7363 // don't complain about missing return statements. 7364 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) 7365 WP.disableCheckFallThrough(); 7366 7367 // MSVC permits the use of pure specifier (=0) on function definition, 7368 // defined at class scope, warn about this non standard construct. 7369 if (getLangOptions().MicrosoftExt && FD->isPure()) 7370 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7371 7372 if (!FD->isInvalidDecl()) { 7373 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7374 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7375 FD->getResultType(), FD); 7376 7377 // If this is a constructor, we need a vtable. 7378 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7379 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7380 7381 computeNRVO(Body, getCurFunction()); 7382 } 7383 7384 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 7385 "Function parsing confused"); 7386 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7387 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7388 MD->setBody(Body); 7389 if (Body) 7390 MD->setEndLoc(Body->getLocEnd()); 7391 if (!MD->isInvalidDecl()) { 7392 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7393 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7394 MD->getResultType(), MD); 7395 7396 if (Body) 7397 computeNRVO(Body, getCurFunction()); 7398 } 7399 if (ObjCShouldCallSuperDealloc) { 7400 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7401 ObjCShouldCallSuperDealloc = false; 7402 } 7403 if (ObjCShouldCallSuperFinalize) { 7404 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7405 ObjCShouldCallSuperFinalize = false; 7406 } 7407 } else { 7408 return 0; 7409 } 7410 7411 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7412 "ObjC methods, which should have been handled in the block above."); 7413 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7414 "ObjC methods, which should have been handled in the block above."); 7415 7416 // Verify and clean out per-function state. 7417 if (Body) { 7418 // C++ constructors that have function-try-blocks can't have return 7419 // statements in the handlers of that block. (C++ [except.handle]p14) 7420 // Verify this. 7421 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7422 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7423 7424 // Verify that gotos and switch cases don't jump into scopes illegally. 7425 if (getCurFunction()->NeedsScopeChecking() && 7426 !dcl->isInvalidDecl() && 7427 !hasAnyUnrecoverableErrorsInThisFunction()) 7428 DiagnoseInvalidJumps(Body); 7429 7430 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7431 if (!Destructor->getParent()->isDependentType()) 7432 CheckDestructor(Destructor); 7433 7434 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7435 Destructor->getParent()); 7436 } 7437 7438 // If any errors have occurred, clear out any temporaries that may have 7439 // been leftover. This ensures that these temporaries won't be picked up for 7440 // deletion in some later function. 7441 if (PP.getDiagnostics().hasErrorOccurred() || 7442 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7443 DiscardCleanupsInEvaluationContext(); 7444 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7445 // Since the body is valid, issue any analysis-based warnings that are 7446 // enabled. 7447 ActivePolicy = &WP; 7448 } 7449 7450 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7451 (!CheckConstexprFunctionDecl(FD) || 7452 !CheckConstexprFunctionBody(FD, Body))) 7453 FD->setInvalidDecl(); 7454 7455 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7456 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7457 assert(MaybeODRUseExprs.empty() && 7458 "Leftover expressions for odr-use checking"); 7459 } 7460 7461 if (!IsInstantiation) 7462 PopDeclContext(); 7463 7464 PopFunctionScopeInfo(ActivePolicy, dcl); 7465 7466 // If any errors have occurred, clear out any temporaries that may have 7467 // been leftover. This ensures that these temporaries won't be picked up for 7468 // deletion in some later function. 7469 if (getDiagnostics().hasErrorOccurred()) { 7470 DiscardCleanupsInEvaluationContext(); 7471 } 7472 7473 return dcl; 7474} 7475 7476 7477/// When we finish delayed parsing of an attribute, we must attach it to the 7478/// relevant Decl. 7479void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7480 ParsedAttributes &Attrs) { 7481 // Always attach attributes to the underlying decl. 7482 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7483 D = TD->getTemplatedDecl(); 7484 ProcessDeclAttributeList(S, D, Attrs.getList()); 7485} 7486 7487 7488/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7489/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7490NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7491 IdentifierInfo &II, Scope *S) { 7492 // Before we produce a declaration for an implicitly defined 7493 // function, see whether there was a locally-scoped declaration of 7494 // this name as a function or variable. If so, use that 7495 // (non-visible) declaration, and complain about it. 7496 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7497 = findLocallyScopedExternalDecl(&II); 7498 if (Pos != LocallyScopedExternalDecls.end()) { 7499 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7500 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7501 return Pos->second; 7502 } 7503 7504 // Extension in C99. Legal in C90, but warn about it. 7505 unsigned diag_id; 7506 if (II.getName().startswith("__builtin_")) 7507 diag_id = diag::warn_builtin_unknown; 7508 else if (getLangOptions().C99) 7509 diag_id = diag::ext_implicit_function_decl; 7510 else 7511 diag_id = diag::warn_implicit_function_decl; 7512 Diag(Loc, diag_id) << &II; 7513 7514 // Because typo correction is expensive, only do it if the implicit 7515 // function declaration is going to be treated as an error. 7516 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7517 TypoCorrection Corrected; 7518 DeclFilterCCC<FunctionDecl> Validator; 7519 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7520 LookupOrdinaryName, S, 0, Validator))) { 7521 std::string CorrectedStr = Corrected.getAsString(getLangOptions()); 7522 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7523 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7524 7525 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7526 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7527 7528 if (Func->getLocation().isValid() 7529 && !II.getName().startswith("__builtin_")) 7530 Diag(Func->getLocation(), diag::note_previous_decl) 7531 << CorrectedQuotedStr; 7532 } 7533 } 7534 7535 // Set a Declarator for the implicit definition: int foo(); 7536 const char *Dummy; 7537 AttributeFactory attrFactory; 7538 DeclSpec DS(attrFactory); 7539 unsigned DiagID; 7540 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7541 (void)Error; // Silence warning. 7542 assert(!Error && "Error setting up implicit decl!"); 7543 Declarator D(DS, Declarator::BlockContext); 7544 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7545 0, 0, true, SourceLocation(), 7546 SourceLocation(), SourceLocation(), 7547 SourceLocation(), 7548 EST_None, SourceLocation(), 7549 0, 0, 0, 0, Loc, Loc, D), 7550 DS.getAttributes(), 7551 SourceLocation()); 7552 D.SetIdentifier(&II, Loc); 7553 7554 // Insert this function into translation-unit scope. 7555 7556 DeclContext *PrevDC = CurContext; 7557 CurContext = Context.getTranslationUnitDecl(); 7558 7559 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7560 FD->setImplicit(); 7561 7562 CurContext = PrevDC; 7563 7564 AddKnownFunctionAttributes(FD); 7565 7566 return FD; 7567} 7568 7569/// \brief Adds any function attributes that we know a priori based on 7570/// the declaration of this function. 7571/// 7572/// These attributes can apply both to implicitly-declared builtins 7573/// (like __builtin___printf_chk) or to library-declared functions 7574/// like NSLog or printf. 7575/// 7576/// We need to check for duplicate attributes both here and where user-written 7577/// attributes are applied to declarations. 7578void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7579 if (FD->isInvalidDecl()) 7580 return; 7581 7582 // If this is a built-in function, map its builtin attributes to 7583 // actual attributes. 7584 if (unsigned BuiltinID = FD->getBuiltinID()) { 7585 // Handle printf-formatting attributes. 7586 unsigned FormatIdx; 7587 bool HasVAListArg; 7588 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7589 if (!FD->getAttr<FormatAttr>()) { 7590 const char *fmt = "printf"; 7591 unsigned int NumParams = FD->getNumParams(); 7592 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7593 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7594 fmt = "NSString"; 7595 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7596 fmt, FormatIdx+1, 7597 HasVAListArg ? 0 : FormatIdx+2)); 7598 } 7599 } 7600 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7601 HasVAListArg)) { 7602 if (!FD->getAttr<FormatAttr>()) 7603 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7604 "scanf", FormatIdx+1, 7605 HasVAListArg ? 0 : FormatIdx+2)); 7606 } 7607 7608 // Mark const if we don't care about errno and that is the only 7609 // thing preventing the function from being const. This allows 7610 // IRgen to use LLVM intrinsics for such functions. 7611 if (!getLangOptions().MathErrno && 7612 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7613 if (!FD->getAttr<ConstAttr>()) 7614 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7615 } 7616 7617 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7618 !FD->getAttr<ReturnsTwiceAttr>()) 7619 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7620 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7621 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7622 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7623 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7624 } 7625 7626 IdentifierInfo *Name = FD->getIdentifier(); 7627 if (!Name) 7628 return; 7629 if ((!getLangOptions().CPlusPlus && 7630 FD->getDeclContext()->isTranslationUnit()) || 7631 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7632 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7633 LinkageSpecDecl::lang_c)) { 7634 // Okay: this could be a libc/libm/Objective-C function we know 7635 // about. 7636 } else 7637 return; 7638 7639 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7640 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7641 // target-specific builtins, perhaps? 7642 if (!FD->getAttr<FormatAttr>()) 7643 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7644 "printf", 2, 7645 Name->isStr("vasprintf") ? 0 : 3)); 7646 } 7647} 7648 7649TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7650 TypeSourceInfo *TInfo) { 7651 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7652 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7653 7654 if (!TInfo) { 7655 assert(D.isInvalidType() && "no declarator info for valid type"); 7656 TInfo = Context.getTrivialTypeSourceInfo(T); 7657 } 7658 7659 // Scope manipulation handled by caller. 7660 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7661 D.getSourceRange().getBegin(), 7662 D.getIdentifierLoc(), 7663 D.getIdentifier(), 7664 TInfo); 7665 7666 // Bail out immediately if we have an invalid declaration. 7667 if (D.isInvalidType()) { 7668 NewTD->setInvalidDecl(); 7669 return NewTD; 7670 } 7671 7672 if (D.getDeclSpec().isModulePrivateSpecified()) { 7673 if (CurContext->isFunctionOrMethod()) 7674 Diag(NewTD->getLocation(), diag::err_module_private_local) 7675 << 2 << NewTD->getDeclName() 7676 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7677 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7678 else 7679 NewTD->setModulePrivate(); 7680 } 7681 7682 // C++ [dcl.typedef]p8: 7683 // If the typedef declaration defines an unnamed class (or 7684 // enum), the first typedef-name declared by the declaration 7685 // to be that class type (or enum type) is used to denote the 7686 // class type (or enum type) for linkage purposes only. 7687 // We need to check whether the type was declared in the declaration. 7688 switch (D.getDeclSpec().getTypeSpecType()) { 7689 case TST_enum: 7690 case TST_struct: 7691 case TST_union: 7692 case TST_class: { 7693 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7694 7695 // Do nothing if the tag is not anonymous or already has an 7696 // associated typedef (from an earlier typedef in this decl group). 7697 if (tagFromDeclSpec->getIdentifier()) break; 7698 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7699 7700 // A well-formed anonymous tag must always be a TUK_Definition. 7701 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7702 7703 // The type must match the tag exactly; no qualifiers allowed. 7704 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7705 break; 7706 7707 // Otherwise, set this is the anon-decl typedef for the tag. 7708 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7709 break; 7710 } 7711 7712 default: 7713 break; 7714 } 7715 7716 return NewTD; 7717} 7718 7719 7720/// \brief Determine whether a tag with a given kind is acceptable 7721/// as a redeclaration of the given tag declaration. 7722/// 7723/// \returns true if the new tag kind is acceptable, false otherwise. 7724bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7725 TagTypeKind NewTag, bool isDefinition, 7726 SourceLocation NewTagLoc, 7727 const IdentifierInfo &Name) { 7728 // C++ [dcl.type.elab]p3: 7729 // The class-key or enum keyword present in the 7730 // elaborated-type-specifier shall agree in kind with the 7731 // declaration to which the name in the elaborated-type-specifier 7732 // refers. This rule also applies to the form of 7733 // elaborated-type-specifier that declares a class-name or 7734 // friend class since it can be construed as referring to the 7735 // definition of the class. Thus, in any 7736 // elaborated-type-specifier, the enum keyword shall be used to 7737 // refer to an enumeration (7.2), the union class-key shall be 7738 // used to refer to a union (clause 9), and either the class or 7739 // struct class-key shall be used to refer to a class (clause 9) 7740 // declared using the class or struct class-key. 7741 TagTypeKind OldTag = Previous->getTagKind(); 7742 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7743 if (OldTag == NewTag) 7744 return true; 7745 7746 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7747 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7748 // Warn about the struct/class tag mismatch. 7749 bool isTemplate = false; 7750 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7751 isTemplate = Record->getDescribedClassTemplate(); 7752 7753 if (!ActiveTemplateInstantiations.empty()) { 7754 // In a template instantiation, do not offer fix-its for tag mismatches 7755 // since they usually mess up the template instead of fixing the problem. 7756 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7757 << (NewTag == TTK_Class) << isTemplate << &Name; 7758 return true; 7759 } 7760 7761 if (isDefinition) { 7762 // On definitions, check previous tags and issue a fix-it for each 7763 // one that doesn't match the current tag. 7764 if (Previous->getDefinition()) { 7765 // Don't suggest fix-its for redefinitions. 7766 return true; 7767 } 7768 7769 bool previousMismatch = false; 7770 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7771 E(Previous->redecls_end()); I != E; ++I) { 7772 if (I->getTagKind() != NewTag) { 7773 if (!previousMismatch) { 7774 previousMismatch = true; 7775 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7776 << (NewTag == TTK_Class) << isTemplate << &Name; 7777 } 7778 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7779 << (NewTag == TTK_Class) 7780 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7781 NewTag == TTK_Class? 7782 "class" : "struct"); 7783 } 7784 } 7785 return true; 7786 } 7787 7788 // Check for a previous definition. If current tag and definition 7789 // are same type, do nothing. If no definition, but disagree with 7790 // with previous tag type, give a warning, but no fix-it. 7791 const TagDecl *Redecl = Previous->getDefinition() ? 7792 Previous->getDefinition() : Previous; 7793 if (Redecl->getTagKind() == NewTag) { 7794 return true; 7795 } 7796 7797 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7798 << (NewTag == TTK_Class) 7799 << isTemplate << &Name; 7800 Diag(Redecl->getLocation(), diag::note_previous_use); 7801 7802 // If there is a previous defintion, suggest a fix-it. 7803 if (Previous->getDefinition()) { 7804 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7805 << (Redecl->getTagKind() == TTK_Class) 7806 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7807 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7808 } 7809 7810 return true; 7811 } 7812 return false; 7813} 7814 7815/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7816/// former case, Name will be non-null. In the later case, Name will be null. 7817/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7818/// reference/declaration/definition of a tag. 7819Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7820 SourceLocation KWLoc, CXXScopeSpec &SS, 7821 IdentifierInfo *Name, SourceLocation NameLoc, 7822 AttributeList *Attr, AccessSpecifier AS, 7823 SourceLocation ModulePrivateLoc, 7824 MultiTemplateParamsArg TemplateParameterLists, 7825 bool &OwnedDecl, bool &IsDependent, 7826 SourceLocation ScopedEnumKWLoc, 7827 bool ScopedEnumUsesClassTag, 7828 TypeResult UnderlyingType) { 7829 // If this is not a definition, it must have a name. 7830 assert((Name != 0 || TUK == TUK_Definition) && 7831 "Nameless record must be a definition!"); 7832 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7833 7834 OwnedDecl = false; 7835 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7836 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 7837 7838 // FIXME: Check explicit specializations more carefully. 7839 bool isExplicitSpecialization = false; 7840 bool Invalid = false; 7841 7842 // We only need to do this matching if we have template parameters 7843 // or a scope specifier, which also conveniently avoids this work 7844 // for non-C++ cases. 7845 if (TemplateParameterLists.size() > 0 || 7846 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7847 if (TemplateParameterList *TemplateParams 7848 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7849 TemplateParameterLists.get(), 7850 TemplateParameterLists.size(), 7851 TUK == TUK_Friend, 7852 isExplicitSpecialization, 7853 Invalid)) { 7854 if (TemplateParams->size() > 0) { 7855 // This is a declaration or definition of a class template (which may 7856 // be a member of another template). 7857 7858 if (Invalid) 7859 return 0; 7860 7861 OwnedDecl = false; 7862 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7863 SS, Name, NameLoc, Attr, 7864 TemplateParams, AS, 7865 ModulePrivateLoc, 7866 TemplateParameterLists.size() - 1, 7867 (TemplateParameterList**) TemplateParameterLists.release()); 7868 return Result.get(); 7869 } else { 7870 // The "template<>" header is extraneous. 7871 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7872 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7873 isExplicitSpecialization = true; 7874 } 7875 } 7876 } 7877 7878 // Figure out the underlying type if this a enum declaration. We need to do 7879 // this early, because it's needed to detect if this is an incompatible 7880 // redeclaration. 7881 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7882 7883 if (Kind == TTK_Enum) { 7884 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7885 // No underlying type explicitly specified, or we failed to parse the 7886 // type, default to int. 7887 EnumUnderlying = Context.IntTy.getTypePtr(); 7888 else if (UnderlyingType.get()) { 7889 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7890 // integral type; any cv-qualification is ignored. 7891 TypeSourceInfo *TI = 0; 7892 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7893 EnumUnderlying = TI; 7894 7895 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7896 7897 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7898 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7899 << T; 7900 // Recover by falling back to int. 7901 EnumUnderlying = Context.IntTy.getTypePtr(); 7902 } 7903 7904 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7905 UPPC_FixedUnderlyingType)) 7906 EnumUnderlying = Context.IntTy.getTypePtr(); 7907 7908 } else if (getLangOptions().MicrosoftMode) 7909 // Microsoft enums are always of int type. 7910 EnumUnderlying = Context.IntTy.getTypePtr(); 7911 } 7912 7913 DeclContext *SearchDC = CurContext; 7914 DeclContext *DC = CurContext; 7915 bool isStdBadAlloc = false; 7916 7917 RedeclarationKind Redecl = ForRedeclaration; 7918 if (TUK == TUK_Friend || TUK == TUK_Reference) 7919 Redecl = NotForRedeclaration; 7920 7921 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7922 7923 if (Name && SS.isNotEmpty()) { 7924 // We have a nested-name tag ('struct foo::bar'). 7925 7926 // Check for invalid 'foo::'. 7927 if (SS.isInvalid()) { 7928 Name = 0; 7929 goto CreateNewDecl; 7930 } 7931 7932 // If this is a friend or a reference to a class in a dependent 7933 // context, don't try to make a decl for it. 7934 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7935 DC = computeDeclContext(SS, false); 7936 if (!DC) { 7937 IsDependent = true; 7938 return 0; 7939 } 7940 } else { 7941 DC = computeDeclContext(SS, true); 7942 if (!DC) { 7943 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7944 << SS.getRange(); 7945 return 0; 7946 } 7947 } 7948 7949 if (RequireCompleteDeclContext(SS, DC)) 7950 return 0; 7951 7952 SearchDC = DC; 7953 // Look-up name inside 'foo::'. 7954 LookupQualifiedName(Previous, DC); 7955 7956 if (Previous.isAmbiguous()) 7957 return 0; 7958 7959 if (Previous.empty()) { 7960 // Name lookup did not find anything. However, if the 7961 // nested-name-specifier refers to the current instantiation, 7962 // and that current instantiation has any dependent base 7963 // classes, we might find something at instantiation time: treat 7964 // this as a dependent elaborated-type-specifier. 7965 // But this only makes any sense for reference-like lookups. 7966 if (Previous.wasNotFoundInCurrentInstantiation() && 7967 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7968 IsDependent = true; 7969 return 0; 7970 } 7971 7972 // A tag 'foo::bar' must already exist. 7973 Diag(NameLoc, diag::err_not_tag_in_scope) 7974 << Kind << Name << DC << SS.getRange(); 7975 Name = 0; 7976 Invalid = true; 7977 goto CreateNewDecl; 7978 } 7979 } else if (Name) { 7980 // If this is a named struct, check to see if there was a previous forward 7981 // declaration or definition. 7982 // FIXME: We're looking into outer scopes here, even when we 7983 // shouldn't be. Doing so can result in ambiguities that we 7984 // shouldn't be diagnosing. 7985 LookupName(Previous, S); 7986 7987 if (Previous.isAmbiguous() && 7988 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7989 LookupResult::Filter F = Previous.makeFilter(); 7990 while (F.hasNext()) { 7991 NamedDecl *ND = F.next(); 7992 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7993 F.erase(); 7994 } 7995 F.done(); 7996 } 7997 7998 // Note: there used to be some attempt at recovery here. 7999 if (Previous.isAmbiguous()) 8000 return 0; 8001 8002 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 8003 // FIXME: This makes sure that we ignore the contexts associated 8004 // with C structs, unions, and enums when looking for a matching 8005 // tag declaration or definition. See the similar lookup tweak 8006 // in Sema::LookupName; is there a better way to deal with this? 8007 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 8008 SearchDC = SearchDC->getParent(); 8009 } 8010 } else if (S->isFunctionPrototypeScope()) { 8011 // If this is an enum declaration in function prototype scope, set its 8012 // initial context to the translation unit. 8013 SearchDC = Context.getTranslationUnitDecl(); 8014 } 8015 8016 if (Previous.isSingleResult() && 8017 Previous.getFoundDecl()->isTemplateParameter()) { 8018 // Maybe we will complain about the shadowed template parameter. 8019 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 8020 // Just pretend that we didn't see the previous declaration. 8021 Previous.clear(); 8022 } 8023 8024 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 8025 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 8026 // This is a declaration of or a reference to "std::bad_alloc". 8027 isStdBadAlloc = true; 8028 8029 if (Previous.empty() && StdBadAlloc) { 8030 // std::bad_alloc has been implicitly declared (but made invisible to 8031 // name lookup). Fill in this implicit declaration as the previous 8032 // declaration, so that the declarations get chained appropriately. 8033 Previous.addDecl(getStdBadAlloc()); 8034 } 8035 } 8036 8037 // If we didn't find a previous declaration, and this is a reference 8038 // (or friend reference), move to the correct scope. In C++, we 8039 // also need to do a redeclaration lookup there, just in case 8040 // there's a shadow friend decl. 8041 if (Name && Previous.empty() && 8042 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8043 if (Invalid) goto CreateNewDecl; 8044 assert(SS.isEmpty()); 8045 8046 if (TUK == TUK_Reference) { 8047 // C++ [basic.scope.pdecl]p5: 8048 // -- for an elaborated-type-specifier of the form 8049 // 8050 // class-key identifier 8051 // 8052 // if the elaborated-type-specifier is used in the 8053 // decl-specifier-seq or parameter-declaration-clause of a 8054 // function defined in namespace scope, the identifier is 8055 // declared as a class-name in the namespace that contains 8056 // the declaration; otherwise, except as a friend 8057 // declaration, the identifier is declared in the smallest 8058 // non-class, non-function-prototype scope that contains the 8059 // declaration. 8060 // 8061 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 8062 // C structs and unions. 8063 // 8064 // It is an error in C++ to declare (rather than define) an enum 8065 // type, including via an elaborated type specifier. We'll 8066 // diagnose that later; for now, declare the enum in the same 8067 // scope as we would have picked for any other tag type. 8068 // 8069 // GNU C also supports this behavior as part of its incomplete 8070 // enum types extension, while GNU C++ does not. 8071 // 8072 // Find the context where we'll be declaring the tag. 8073 // FIXME: We would like to maintain the current DeclContext as the 8074 // lexical context, 8075 while (SearchDC->isRecord() || SearchDC->isTransparentContext() || 8076 SearchDC->isObjCContainer()) 8077 SearchDC = SearchDC->getParent(); 8078 8079 // Find the scope where we'll be declaring the tag. 8080 while (S->isClassScope() || 8081 (getLangOptions().CPlusPlus && 8082 S->isFunctionPrototypeScope()) || 8083 ((S->getFlags() & Scope::DeclScope) == 0) || 8084 (S->getEntity() && 8085 ((DeclContext *)S->getEntity())->isTransparentContext())) 8086 S = S->getParent(); 8087 } else { 8088 assert(TUK == TUK_Friend); 8089 // C++ [namespace.memdef]p3: 8090 // If a friend declaration in a non-local class first declares a 8091 // class or function, the friend class or function is a member of 8092 // the innermost enclosing namespace. 8093 SearchDC = SearchDC->getEnclosingNamespaceContext(); 8094 } 8095 8096 // In C++, we need to do a redeclaration lookup to properly 8097 // diagnose some problems. 8098 if (getLangOptions().CPlusPlus) { 8099 Previous.setRedeclarationKind(ForRedeclaration); 8100 LookupQualifiedName(Previous, SearchDC); 8101 } 8102 } 8103 8104 if (!Previous.empty()) { 8105 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 8106 8107 // It's okay to have a tag decl in the same scope as a typedef 8108 // which hides a tag decl in the same scope. Finding this 8109 // insanity with a redeclaration lookup can only actually happen 8110 // in C++. 8111 // 8112 // This is also okay for elaborated-type-specifiers, which is 8113 // technically forbidden by the current standard but which is 8114 // okay according to the likely resolution of an open issue; 8115 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 8116 if (getLangOptions().CPlusPlus) { 8117 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8118 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 8119 TagDecl *Tag = TT->getDecl(); 8120 if (Tag->getDeclName() == Name && 8121 Tag->getDeclContext()->getRedeclContext() 8122 ->Equals(TD->getDeclContext()->getRedeclContext())) { 8123 PrevDecl = Tag; 8124 Previous.clear(); 8125 Previous.addDecl(Tag); 8126 Previous.resolveKind(); 8127 } 8128 } 8129 } 8130 } 8131 8132 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 8133 // If this is a use of a previous tag, or if the tag is already declared 8134 // in the same scope (so that the definition/declaration completes or 8135 // rementions the tag), reuse the decl. 8136 if (TUK == TUK_Reference || TUK == TUK_Friend || 8137 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 8138 // Make sure that this wasn't declared as an enum and now used as a 8139 // struct or something similar. 8140 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 8141 TUK == TUK_Definition, KWLoc, 8142 *Name)) { 8143 bool SafeToContinue 8144 = (PrevTagDecl->getTagKind() != TTK_Enum && 8145 Kind != TTK_Enum); 8146 if (SafeToContinue) 8147 Diag(KWLoc, diag::err_use_with_wrong_tag) 8148 << Name 8149 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8150 PrevTagDecl->getKindName()); 8151 else 8152 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8153 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8154 8155 if (SafeToContinue) 8156 Kind = PrevTagDecl->getTagKind(); 8157 else { 8158 // Recover by making this an anonymous redefinition. 8159 Name = 0; 8160 Previous.clear(); 8161 Invalid = true; 8162 } 8163 } 8164 8165 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8166 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8167 8168 // If this is an elaborated-type-specifier for a scoped enumeration, 8169 // the 'class' keyword is not necessary and not permitted. 8170 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8171 if (ScopedEnum) 8172 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8173 << PrevEnum->isScoped() 8174 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8175 return PrevTagDecl; 8176 } 8177 8178 // All conflicts with previous declarations are recovered by 8179 // returning the previous declaration. 8180 if (ScopedEnum != PrevEnum->isScoped()) { 8181 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 8182 << PrevEnum->isScoped(); 8183 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8184 return PrevTagDecl; 8185 } 8186 else if (EnumUnderlying && PrevEnum->isFixed()) { 8187 QualType T; 8188 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8189 T = TI->getType(); 8190 else 8191 T = QualType(EnumUnderlying.get<const Type*>(), 0); 8192 8193 if (!Context.hasSameUnqualifiedType(T, 8194 PrevEnum->getIntegerType())) { 8195 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 8196 diag::err_enum_redeclare_type_mismatch) 8197 << T 8198 << PrevEnum->getIntegerType(); 8199 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8200 return PrevTagDecl; 8201 } 8202 } 8203 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 8204 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 8205 << PrevEnum->isFixed(); 8206 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8207 return PrevTagDecl; 8208 } 8209 } 8210 8211 if (!Invalid) { 8212 // If this is a use, just return the declaration we found. 8213 8214 // FIXME: In the future, return a variant or some other clue 8215 // for the consumer of this Decl to know it doesn't own it. 8216 // For our current ASTs this shouldn't be a problem, but will 8217 // need to be changed with DeclGroups. 8218 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8219 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 8220 return PrevTagDecl; 8221 8222 // Diagnose attempts to redefine a tag. 8223 if (TUK == TUK_Definition) { 8224 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8225 // If we're defining a specialization and the previous definition 8226 // is from an implicit instantiation, don't emit an error 8227 // here; we'll catch this in the general case below. 8228 if (!isExplicitSpecialization || 8229 !isa<CXXRecordDecl>(Def) || 8230 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 8231 == TSK_ExplicitSpecialization) { 8232 // A redeclaration in function prototype scope in C isn't 8233 // visible elsewhere, so merely issue a warning. 8234 if (!getLangOptions().CPlusPlus && S->containedInPrototypeScope()) 8235 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name; 8236 else 8237 Diag(NameLoc, diag::err_redefinition) << Name; 8238 Diag(Def->getLocation(), diag::note_previous_definition); 8239 // If this is a redefinition, recover by making this 8240 // struct be anonymous, which will make any later 8241 // references get the previous definition. 8242 Name = 0; 8243 Previous.clear(); 8244 Invalid = true; 8245 } 8246 } else { 8247 // If the type is currently being defined, complain 8248 // about a nested redefinition. 8249 const TagType *Tag 8250 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8251 if (Tag->isBeingDefined()) { 8252 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8253 Diag(PrevTagDecl->getLocation(), 8254 diag::note_previous_definition); 8255 Name = 0; 8256 Previous.clear(); 8257 Invalid = true; 8258 } 8259 } 8260 8261 // Okay, this is definition of a previously declared or referenced 8262 // tag PrevDecl. We're going to create a new Decl for it. 8263 } 8264 } 8265 // If we get here we have (another) forward declaration or we 8266 // have a definition. Just create a new decl. 8267 8268 } else { 8269 // If we get here, this is a definition of a new tag type in a nested 8270 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8271 // new decl/type. We set PrevDecl to NULL so that the entities 8272 // have distinct types. 8273 Previous.clear(); 8274 } 8275 // If we get here, we're going to create a new Decl. If PrevDecl 8276 // is non-NULL, it's a definition of the tag declared by 8277 // PrevDecl. If it's NULL, we have a new definition. 8278 8279 8280 // Otherwise, PrevDecl is not a tag, but was found with tag 8281 // lookup. This is only actually possible in C++, where a few 8282 // things like templates still live in the tag namespace. 8283 } else { 8284 // Use a better diagnostic if an elaborated-type-specifier 8285 // found the wrong kind of type on the first 8286 // (non-redeclaration) lookup. 8287 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8288 !Previous.isForRedeclaration()) { 8289 unsigned Kind = 0; 8290 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8291 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8292 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8293 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8294 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8295 Invalid = true; 8296 8297 // Otherwise, only diagnose if the declaration is in scope. 8298 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8299 isExplicitSpecialization)) { 8300 // do nothing 8301 8302 // Diagnose implicit declarations introduced by elaborated types. 8303 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8304 unsigned Kind = 0; 8305 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8306 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8307 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8308 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8309 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8310 Invalid = true; 8311 8312 // Otherwise it's a declaration. Call out a particularly common 8313 // case here. 8314 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8315 unsigned Kind = 0; 8316 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8317 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8318 << Name << Kind << TND->getUnderlyingType(); 8319 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8320 Invalid = true; 8321 8322 // Otherwise, diagnose. 8323 } else { 8324 // The tag name clashes with something else in the target scope, 8325 // issue an error and recover by making this tag be anonymous. 8326 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8327 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8328 Name = 0; 8329 Invalid = true; 8330 } 8331 8332 // The existing declaration isn't relevant to us; we're in a 8333 // new scope, so clear out the previous declaration. 8334 Previous.clear(); 8335 } 8336 } 8337 8338CreateNewDecl: 8339 8340 TagDecl *PrevDecl = 0; 8341 if (Previous.isSingleResult()) 8342 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8343 8344 // If there is an identifier, use the location of the identifier as the 8345 // location of the decl, otherwise use the location of the struct/union 8346 // keyword. 8347 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8348 8349 // Otherwise, create a new declaration. If there is a previous 8350 // declaration of the same entity, the two will be linked via 8351 // PrevDecl. 8352 TagDecl *New; 8353 8354 bool IsForwardReference = false; 8355 if (Kind == TTK_Enum) { 8356 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8357 // enum X { A, B, C } D; D should chain to X. 8358 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8359 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8360 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8361 // If this is an undefined enum, warn. 8362 if (TUK != TUK_Definition && !Invalid) { 8363 TagDecl *Def; 8364 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8365 // C++0x: 7.2p2: opaque-enum-declaration. 8366 // Conflicts are diagnosed above. Do nothing. 8367 } 8368 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8369 Diag(Loc, diag::ext_forward_ref_enum_def) 8370 << New; 8371 Diag(Def->getLocation(), diag::note_previous_definition); 8372 } else { 8373 unsigned DiagID = diag::ext_forward_ref_enum; 8374 if (getLangOptions().MicrosoftMode) 8375 DiagID = diag::ext_ms_forward_ref_enum; 8376 else if (getLangOptions().CPlusPlus) 8377 DiagID = diag::err_forward_ref_enum; 8378 Diag(Loc, DiagID); 8379 8380 // If this is a forward-declared reference to an enumeration, make a 8381 // note of it; we won't actually be introducing the declaration into 8382 // the declaration context. 8383 if (TUK == TUK_Reference) 8384 IsForwardReference = true; 8385 } 8386 } 8387 8388 if (EnumUnderlying) { 8389 EnumDecl *ED = cast<EnumDecl>(New); 8390 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8391 ED->setIntegerTypeSourceInfo(TI); 8392 else 8393 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8394 ED->setPromotionType(ED->getIntegerType()); 8395 } 8396 8397 } else { 8398 // struct/union/class 8399 8400 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8401 // struct X { int A; } D; D should chain to X. 8402 if (getLangOptions().CPlusPlus) { 8403 // FIXME: Look for a way to use RecordDecl for simple structs. 8404 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8405 cast_or_null<CXXRecordDecl>(PrevDecl)); 8406 8407 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8408 StdBadAlloc = cast<CXXRecordDecl>(New); 8409 } else 8410 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8411 cast_or_null<RecordDecl>(PrevDecl)); 8412 } 8413 8414 // Maybe add qualifier info. 8415 if (SS.isNotEmpty()) { 8416 if (SS.isSet()) { 8417 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8418 if (TemplateParameterLists.size() > 0) { 8419 New->setTemplateParameterListsInfo(Context, 8420 TemplateParameterLists.size(), 8421 (TemplateParameterList**) TemplateParameterLists.release()); 8422 } 8423 } 8424 else 8425 Invalid = true; 8426 } 8427 8428 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8429 // Add alignment attributes if necessary; these attributes are checked when 8430 // the ASTContext lays out the structure. 8431 // 8432 // It is important for implementing the correct semantics that this 8433 // happen here (in act on tag decl). The #pragma pack stack is 8434 // maintained as a result of parser callbacks which can occur at 8435 // many points during the parsing of a struct declaration (because 8436 // the #pragma tokens are effectively skipped over during the 8437 // parsing of the struct). 8438 AddAlignmentAttributesForRecord(RD); 8439 8440 AddMsStructLayoutForRecord(RD); 8441 } 8442 8443 if (ModulePrivateLoc.isValid()) { 8444 if (isExplicitSpecialization) 8445 Diag(New->getLocation(), diag::err_module_private_specialization) 8446 << 2 8447 << FixItHint::CreateRemoval(ModulePrivateLoc); 8448 // __module_private__ does not apply to local classes. However, we only 8449 // diagnose this as an error when the declaration specifiers are 8450 // freestanding. Here, we just ignore the __module_private__. 8451 else if (!SearchDC->isFunctionOrMethod()) 8452 New->setModulePrivate(); 8453 } 8454 8455 // If this is a specialization of a member class (of a class template), 8456 // check the specialization. 8457 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8458 Invalid = true; 8459 8460 if (Invalid) 8461 New->setInvalidDecl(); 8462 8463 if (Attr) 8464 ProcessDeclAttributeList(S, New, Attr); 8465 8466 // If we're declaring or defining a tag in function prototype scope 8467 // in C, note that this type can only be used within the function. 8468 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8469 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8470 8471 // Set the lexical context. If the tag has a C++ scope specifier, the 8472 // lexical context will be different from the semantic context. 8473 New->setLexicalDeclContext(CurContext); 8474 8475 // Mark this as a friend decl if applicable. 8476 // In Microsoft mode, a friend declaration also acts as a forward 8477 // declaration so we always pass true to setObjectOfFriendDecl to make 8478 // the tag name visible. 8479 if (TUK == TUK_Friend) 8480 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8481 getLangOptions().MicrosoftExt); 8482 8483 // Set the access specifier. 8484 if (!Invalid && SearchDC->isRecord()) 8485 SetMemberAccessSpecifier(New, PrevDecl, AS); 8486 8487 if (TUK == TUK_Definition) 8488 New->startDefinition(); 8489 8490 // If this has an identifier, add it to the scope stack. 8491 if (TUK == TUK_Friend) { 8492 // We might be replacing an existing declaration in the lookup tables; 8493 // if so, borrow its access specifier. 8494 if (PrevDecl) 8495 New->setAccess(PrevDecl->getAccess()); 8496 8497 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8498 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8499 if (Name) // can be null along some error paths 8500 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8501 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8502 } else if (Name) { 8503 S = getNonFieldDeclScope(S); 8504 PushOnScopeChains(New, S, !IsForwardReference); 8505 if (IsForwardReference) 8506 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8507 8508 } else { 8509 CurContext->addDecl(New); 8510 } 8511 8512 // If this is the C FILE type, notify the AST context. 8513 if (IdentifierInfo *II = New->getIdentifier()) 8514 if (!New->isInvalidDecl() && 8515 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8516 II->isStr("FILE")) 8517 Context.setFILEDecl(New); 8518 8519 // If we were in function prototype scope (and not in C++ mode), add this 8520 // tag to the list of decls to inject into the function definition scope. 8521 if (S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus && 8522 InFunctionDeclarator && Name) 8523 DeclsInPrototypeScope.push_back(New); 8524 8525 OwnedDecl = true; 8526 return New; 8527} 8528 8529void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8530 AdjustDeclIfTemplate(TagD); 8531 TagDecl *Tag = cast<TagDecl>(TagD); 8532 8533 // Enter the tag context. 8534 PushDeclContext(S, Tag); 8535} 8536 8537Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8538 assert(isa<ObjCContainerDecl>(IDecl) && 8539 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8540 DeclContext *OCD = cast<DeclContext>(IDecl); 8541 assert(getContainingDC(OCD) == CurContext && 8542 "The next DeclContext should be lexically contained in the current one."); 8543 CurContext = OCD; 8544 return IDecl; 8545} 8546 8547void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8548 SourceLocation FinalLoc, 8549 SourceLocation LBraceLoc) { 8550 AdjustDeclIfTemplate(TagD); 8551 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8552 8553 FieldCollector->StartClass(); 8554 8555 if (!Record->getIdentifier()) 8556 return; 8557 8558 if (FinalLoc.isValid()) 8559 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8560 8561 // C++ [class]p2: 8562 // [...] The class-name is also inserted into the scope of the 8563 // class itself; this is known as the injected-class-name. For 8564 // purposes of access checking, the injected-class-name is treated 8565 // as if it were a public member name. 8566 CXXRecordDecl *InjectedClassName 8567 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8568 Record->getLocStart(), Record->getLocation(), 8569 Record->getIdentifier(), 8570 /*PrevDecl=*/0, 8571 /*DelayTypeCreation=*/true); 8572 Context.getTypeDeclType(InjectedClassName, Record); 8573 InjectedClassName->setImplicit(); 8574 InjectedClassName->setAccess(AS_public); 8575 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8576 InjectedClassName->setDescribedClassTemplate(Template); 8577 PushOnScopeChains(InjectedClassName, S); 8578 assert(InjectedClassName->isInjectedClassName() && 8579 "Broken injected-class-name"); 8580} 8581 8582void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8583 SourceLocation RBraceLoc) { 8584 AdjustDeclIfTemplate(TagD); 8585 TagDecl *Tag = cast<TagDecl>(TagD); 8586 Tag->setRBraceLoc(RBraceLoc); 8587 8588 if (isa<CXXRecordDecl>(Tag)) 8589 FieldCollector->FinishClass(); 8590 8591 // Exit this scope of this tag's definition. 8592 PopDeclContext(); 8593 8594 // Notify the consumer that we've defined a tag. 8595 Consumer.HandleTagDeclDefinition(Tag); 8596} 8597 8598void Sema::ActOnObjCContainerFinishDefinition() { 8599 // Exit this scope of this interface definition. 8600 PopDeclContext(); 8601} 8602 8603void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8604 assert(DC == CurContext && "Mismatch of container contexts"); 8605 OriginalLexicalContext = DC; 8606 ActOnObjCContainerFinishDefinition(); 8607} 8608 8609void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8610 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8611 OriginalLexicalContext = 0; 8612} 8613 8614void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8615 AdjustDeclIfTemplate(TagD); 8616 TagDecl *Tag = cast<TagDecl>(TagD); 8617 Tag->setInvalidDecl(); 8618 8619 // We're undoing ActOnTagStartDefinition here, not 8620 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8621 // the FieldCollector. 8622 8623 PopDeclContext(); 8624} 8625 8626// Note that FieldName may be null for anonymous bitfields. 8627ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 8628 IdentifierInfo *FieldName, 8629 QualType FieldTy, Expr *BitWidth, 8630 bool *ZeroWidth) { 8631 // Default to true; that shouldn't confuse checks for emptiness 8632 if (ZeroWidth) 8633 *ZeroWidth = true; 8634 8635 // C99 6.7.2.1p4 - verify the field type. 8636 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8637 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8638 // Handle incomplete types with specific error. 8639 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8640 return ExprError(); 8641 if (FieldName) 8642 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8643 << FieldName << FieldTy << BitWidth->getSourceRange(); 8644 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8645 << FieldTy << BitWidth->getSourceRange(); 8646 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8647 UPPC_BitFieldWidth)) 8648 return ExprError(); 8649 8650 // If the bit-width is type- or value-dependent, don't try to check 8651 // it now. 8652 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8653 return Owned(BitWidth); 8654 8655 llvm::APSInt Value; 8656 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 8657 if (ICE.isInvalid()) 8658 return ICE; 8659 BitWidth = ICE.take(); 8660 8661 if (Value != 0 && ZeroWidth) 8662 *ZeroWidth = false; 8663 8664 // Zero-width bitfield is ok for anonymous field. 8665 if (Value == 0 && FieldName) 8666 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8667 8668 if (Value.isSigned() && Value.isNegative()) { 8669 if (FieldName) 8670 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8671 << FieldName << Value.toString(10); 8672 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8673 << Value.toString(10); 8674 } 8675 8676 if (!FieldTy->isDependentType()) { 8677 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8678 if (Value.getZExtValue() > TypeSize) { 8679 if (!getLangOptions().CPlusPlus) { 8680 if (FieldName) 8681 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8682 << FieldName << (unsigned)Value.getZExtValue() 8683 << (unsigned)TypeSize; 8684 8685 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8686 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8687 } 8688 8689 if (FieldName) 8690 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8691 << FieldName << (unsigned)Value.getZExtValue() 8692 << (unsigned)TypeSize; 8693 else 8694 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8695 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8696 } 8697 } 8698 8699 return Owned(BitWidth); 8700} 8701 8702/// ActOnField - Each field of a C struct/union is passed into this in order 8703/// to create a FieldDecl object for it. 8704Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8705 Declarator &D, Expr *BitfieldWidth) { 8706 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8707 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8708 /*HasInit=*/false, AS_public); 8709 return Res; 8710} 8711 8712/// HandleField - Analyze a field of a C struct or a C++ data member. 8713/// 8714FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8715 SourceLocation DeclStart, 8716 Declarator &D, Expr *BitWidth, bool HasInit, 8717 AccessSpecifier AS) { 8718 IdentifierInfo *II = D.getIdentifier(); 8719 SourceLocation Loc = DeclStart; 8720 if (II) Loc = D.getIdentifierLoc(); 8721 8722 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8723 QualType T = TInfo->getType(); 8724 if (getLangOptions().CPlusPlus) { 8725 CheckExtraCXXDefaultArguments(D); 8726 8727 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8728 UPPC_DataMemberType)) { 8729 D.setInvalidType(); 8730 T = Context.IntTy; 8731 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8732 } 8733 } 8734 8735 DiagnoseFunctionSpecifiers(D); 8736 8737 if (D.getDeclSpec().isThreadSpecified()) 8738 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8739 if (D.getDeclSpec().isConstexprSpecified()) 8740 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8741 << 2; 8742 8743 // Check to see if this name was declared as a member previously 8744 NamedDecl *PrevDecl = 0; 8745 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8746 LookupName(Previous, S); 8747 switch (Previous.getResultKind()) { 8748 case LookupResult::Found: 8749 case LookupResult::FoundUnresolvedValue: 8750 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8751 break; 8752 8753 case LookupResult::FoundOverloaded: 8754 PrevDecl = Previous.getRepresentativeDecl(); 8755 break; 8756 8757 case LookupResult::NotFound: 8758 case LookupResult::NotFoundInCurrentInstantiation: 8759 case LookupResult::Ambiguous: 8760 break; 8761 } 8762 Previous.suppressDiagnostics(); 8763 8764 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8765 // Maybe we will complain about the shadowed template parameter. 8766 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8767 // Just pretend that we didn't see the previous declaration. 8768 PrevDecl = 0; 8769 } 8770 8771 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8772 PrevDecl = 0; 8773 8774 bool Mutable 8775 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8776 SourceLocation TSSL = D.getSourceRange().getBegin(); 8777 FieldDecl *NewFD 8778 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8779 TSSL, AS, PrevDecl, &D); 8780 8781 if (NewFD->isInvalidDecl()) 8782 Record->setInvalidDecl(); 8783 8784 if (D.getDeclSpec().isModulePrivateSpecified()) 8785 NewFD->setModulePrivate(); 8786 8787 if (NewFD->isInvalidDecl() && PrevDecl) { 8788 // Don't introduce NewFD into scope; there's already something 8789 // with the same name in the same scope. 8790 } else if (II) { 8791 PushOnScopeChains(NewFD, S); 8792 } else 8793 Record->addDecl(NewFD); 8794 8795 return NewFD; 8796} 8797 8798/// \brief Build a new FieldDecl and check its well-formedness. 8799/// 8800/// This routine builds a new FieldDecl given the fields name, type, 8801/// record, etc. \p PrevDecl should refer to any previous declaration 8802/// with the same name and in the same scope as the field to be 8803/// created. 8804/// 8805/// \returns a new FieldDecl. 8806/// 8807/// \todo The Declarator argument is a hack. It will be removed once 8808FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8809 TypeSourceInfo *TInfo, 8810 RecordDecl *Record, SourceLocation Loc, 8811 bool Mutable, Expr *BitWidth, bool HasInit, 8812 SourceLocation TSSL, 8813 AccessSpecifier AS, NamedDecl *PrevDecl, 8814 Declarator *D) { 8815 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8816 bool InvalidDecl = false; 8817 if (D) InvalidDecl = D->isInvalidType(); 8818 8819 // If we receive a broken type, recover by assuming 'int' and 8820 // marking this declaration as invalid. 8821 if (T.isNull()) { 8822 InvalidDecl = true; 8823 T = Context.IntTy; 8824 } 8825 8826 QualType EltTy = Context.getBaseElementType(T); 8827 if (!EltTy->isDependentType() && 8828 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8829 // Fields of incomplete type force their record to be invalid. 8830 Record->setInvalidDecl(); 8831 InvalidDecl = true; 8832 } 8833 8834 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8835 // than a variably modified type. 8836 if (!InvalidDecl && T->isVariablyModifiedType()) { 8837 bool SizeIsNegative; 8838 llvm::APSInt Oversized; 8839 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8840 SizeIsNegative, 8841 Oversized); 8842 if (!FixedTy.isNull()) { 8843 Diag(Loc, diag::warn_illegal_constant_array_size); 8844 T = FixedTy; 8845 } else { 8846 if (SizeIsNegative) 8847 Diag(Loc, diag::err_typecheck_negative_array_size); 8848 else if (Oversized.getBoolValue()) 8849 Diag(Loc, diag::err_array_too_large) 8850 << Oversized.toString(10); 8851 else 8852 Diag(Loc, diag::err_typecheck_field_variable_size); 8853 InvalidDecl = true; 8854 } 8855 } 8856 8857 // Fields can not have abstract class types 8858 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8859 diag::err_abstract_type_in_decl, 8860 AbstractFieldType)) 8861 InvalidDecl = true; 8862 8863 bool ZeroWidth = false; 8864 // If this is declared as a bit-field, check the bit-field. 8865 if (!InvalidDecl && BitWidth) { 8866 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 8867 if (!BitWidth) { 8868 InvalidDecl = true; 8869 BitWidth = 0; 8870 ZeroWidth = false; 8871 } 8872 } 8873 8874 // Check that 'mutable' is consistent with the type of the declaration. 8875 if (!InvalidDecl && Mutable) { 8876 unsigned DiagID = 0; 8877 if (T->isReferenceType()) 8878 DiagID = diag::err_mutable_reference; 8879 else if (T.isConstQualified()) 8880 DiagID = diag::err_mutable_const; 8881 8882 if (DiagID) { 8883 SourceLocation ErrLoc = Loc; 8884 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8885 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8886 Diag(ErrLoc, DiagID); 8887 Mutable = false; 8888 InvalidDecl = true; 8889 } 8890 } 8891 8892 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8893 BitWidth, Mutable, HasInit); 8894 if (InvalidDecl) 8895 NewFD->setInvalidDecl(); 8896 8897 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8898 Diag(Loc, diag::err_duplicate_member) << II; 8899 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8900 NewFD->setInvalidDecl(); 8901 } 8902 8903 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8904 if (Record->isUnion()) { 8905 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8906 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8907 if (RDecl->getDefinition()) { 8908 // C++ [class.union]p1: An object of a class with a non-trivial 8909 // constructor, a non-trivial copy constructor, a non-trivial 8910 // destructor, or a non-trivial copy assignment operator 8911 // cannot be a member of a union, nor can an array of such 8912 // objects. 8913 if (CheckNontrivialField(NewFD)) 8914 NewFD->setInvalidDecl(); 8915 } 8916 } 8917 8918 // C++ [class.union]p1: If a union contains a member of reference type, 8919 // the program is ill-formed. 8920 if (EltTy->isReferenceType()) { 8921 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8922 << NewFD->getDeclName() << EltTy; 8923 NewFD->setInvalidDecl(); 8924 } 8925 } 8926 } 8927 8928 // FIXME: We need to pass in the attributes given an AST 8929 // representation, not a parser representation. 8930 if (D) 8931 // FIXME: What to pass instead of TUScope? 8932 ProcessDeclAttributes(TUScope, NewFD, *D); 8933 8934 // In auto-retain/release, infer strong retension for fields of 8935 // retainable type. 8936 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8937 NewFD->setInvalidDecl(); 8938 8939 if (T.isObjCGCWeak()) 8940 Diag(Loc, diag::warn_attribute_weak_on_field); 8941 8942 NewFD->setAccess(AS); 8943 return NewFD; 8944} 8945 8946bool Sema::CheckNontrivialField(FieldDecl *FD) { 8947 assert(FD); 8948 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8949 8950 if (FD->isInvalidDecl()) 8951 return true; 8952 8953 QualType EltTy = Context.getBaseElementType(FD->getType()); 8954 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8955 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8956 if (RDecl->getDefinition()) { 8957 // We check for copy constructors before constructors 8958 // because otherwise we'll never get complaints about 8959 // copy constructors. 8960 8961 CXXSpecialMember member = CXXInvalid; 8962 if (!RDecl->hasTrivialCopyConstructor()) 8963 member = CXXCopyConstructor; 8964 else if (!RDecl->hasTrivialDefaultConstructor()) 8965 member = CXXDefaultConstructor; 8966 else if (!RDecl->hasTrivialCopyAssignment()) 8967 member = CXXCopyAssignment; 8968 else if (!RDecl->hasTrivialDestructor()) 8969 member = CXXDestructor; 8970 8971 if (member != CXXInvalid) { 8972 if (!getLangOptions().CPlusPlus0x && 8973 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8974 // Objective-C++ ARC: it is an error to have a non-trivial field of 8975 // a union. However, system headers in Objective-C programs 8976 // occasionally have Objective-C lifetime objects within unions, 8977 // and rather than cause the program to fail, we make those 8978 // members unavailable. 8979 SourceLocation Loc = FD->getLocation(); 8980 if (getSourceManager().isInSystemHeader(Loc)) { 8981 if (!FD->hasAttr<UnavailableAttr>()) 8982 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8983 "this system field has retaining ownership")); 8984 return false; 8985 } 8986 } 8987 8988 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8989 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8990 diag::err_illegal_union_or_anon_struct_member) 8991 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8992 DiagnoseNontrivial(RT, member); 8993 return !getLangOptions().CPlusPlus0x; 8994 } 8995 } 8996 } 8997 8998 return false; 8999} 9000 9001/// If the given constructor is user-provided, produce a diagnostic explaining 9002/// that it makes the class non-trivial. 9003static bool DiagnoseNontrivialUserProvidedCtor(Sema &S, QualType QT, 9004 CXXConstructorDecl *CD, 9005 Sema::CXXSpecialMember CSM) { 9006 if (!CD->isUserProvided()) 9007 return false; 9008 9009 SourceLocation CtorLoc = CD->getLocation(); 9010 S.Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << CSM; 9011 return true; 9012} 9013 9014/// DiagnoseNontrivial - Given that a class has a non-trivial 9015/// special member, figure out why. 9016void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 9017 QualType QT(T, 0U); 9018 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 9019 9020 // Check whether the member was user-declared. 9021 switch (member) { 9022 case CXXInvalid: 9023 break; 9024 9025 case CXXDefaultConstructor: 9026 if (RD->hasUserDeclaredConstructor()) { 9027 typedef CXXRecordDecl::ctor_iterator ctor_iter; 9028 for (ctor_iter CI = RD->ctor_begin(), CE = RD->ctor_end(); CI != CE; ++CI) 9029 if (DiagnoseNontrivialUserProvidedCtor(*this, QT, *CI, member)) 9030 return; 9031 9032 // No user-provided constructors; look for constructor templates. 9033 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 9034 tmpl_iter; 9035 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); 9036 TI != TE; ++TI) { 9037 CXXConstructorDecl *CD = 9038 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()); 9039 if (CD && DiagnoseNontrivialUserProvidedCtor(*this, QT, CD, member)) 9040 return; 9041 } 9042 } 9043 break; 9044 9045 case CXXCopyConstructor: 9046 if (RD->hasUserDeclaredCopyConstructor()) { 9047 SourceLocation CtorLoc = 9048 RD->getCopyConstructor(0)->getLocation(); 9049 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9050 return; 9051 } 9052 break; 9053 9054 case CXXMoveConstructor: 9055 if (RD->hasUserDeclaredMoveConstructor()) { 9056 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 9057 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9058 return; 9059 } 9060 break; 9061 9062 case CXXCopyAssignment: 9063 if (RD->hasUserDeclaredCopyAssignment()) { 9064 // FIXME: this should use the location of the copy 9065 // assignment, not the type. 9066 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 9067 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 9068 return; 9069 } 9070 break; 9071 9072 case CXXMoveAssignment: 9073 if (RD->hasUserDeclaredMoveAssignment()) { 9074 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 9075 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9076 return; 9077 } 9078 break; 9079 9080 case CXXDestructor: 9081 if (RD->hasUserDeclaredDestructor()) { 9082 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 9083 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9084 return; 9085 } 9086 break; 9087 } 9088 9089 typedef CXXRecordDecl::base_class_iterator base_iter; 9090 9091 // Virtual bases and members inhibit trivial copying/construction, 9092 // but not trivial destruction. 9093 if (member != CXXDestructor) { 9094 // Check for virtual bases. vbases includes indirect virtual bases, 9095 // so we just iterate through the direct bases. 9096 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 9097 if (bi->isVirtual()) { 9098 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 9099 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 9100 return; 9101 } 9102 9103 // Check for virtual methods. 9104 typedef CXXRecordDecl::method_iterator meth_iter; 9105 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 9106 ++mi) { 9107 if (mi->isVirtual()) { 9108 SourceLocation MLoc = mi->getSourceRange().getBegin(); 9109 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 9110 return; 9111 } 9112 } 9113 } 9114 9115 bool (CXXRecordDecl::*hasTrivial)() const; 9116 switch (member) { 9117 case CXXDefaultConstructor: 9118 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 9119 case CXXCopyConstructor: 9120 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 9121 case CXXCopyAssignment: 9122 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 9123 case CXXDestructor: 9124 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 9125 default: 9126 llvm_unreachable("unexpected special member"); 9127 } 9128 9129 // Check for nontrivial bases (and recurse). 9130 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 9131 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 9132 assert(BaseRT && "Don't know how to handle dependent bases"); 9133 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 9134 if (!(BaseRecTy->*hasTrivial)()) { 9135 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 9136 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 9137 DiagnoseNontrivial(BaseRT, member); 9138 return; 9139 } 9140 } 9141 9142 // Check for nontrivial members (and recurse). 9143 typedef RecordDecl::field_iterator field_iter; 9144 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 9145 ++fi) { 9146 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 9147 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 9148 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 9149 9150 if (!(EltRD->*hasTrivial)()) { 9151 SourceLocation FLoc = (*fi)->getLocation(); 9152 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 9153 DiagnoseNontrivial(EltRT, member); 9154 return; 9155 } 9156 } 9157 9158 if (EltTy->isObjCLifetimeType()) { 9159 switch (EltTy.getObjCLifetime()) { 9160 case Qualifiers::OCL_None: 9161 case Qualifiers::OCL_ExplicitNone: 9162 break; 9163 9164 case Qualifiers::OCL_Autoreleasing: 9165 case Qualifiers::OCL_Weak: 9166 case Qualifiers::OCL_Strong: 9167 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 9168 << QT << EltTy.getObjCLifetime(); 9169 return; 9170 } 9171 } 9172 } 9173 9174 llvm_unreachable("found no explanation for non-trivial member"); 9175} 9176 9177/// TranslateIvarVisibility - Translate visibility from a token ID to an 9178/// AST enum value. 9179static ObjCIvarDecl::AccessControl 9180TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9181 switch (ivarVisibility) { 9182 default: llvm_unreachable("Unknown visitibility kind"); 9183 case tok::objc_private: return ObjCIvarDecl::Private; 9184 case tok::objc_public: return ObjCIvarDecl::Public; 9185 case tok::objc_protected: return ObjCIvarDecl::Protected; 9186 case tok::objc_package: return ObjCIvarDecl::Package; 9187 } 9188} 9189 9190/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9191/// in order to create an IvarDecl object for it. 9192Decl *Sema::ActOnIvar(Scope *S, 9193 SourceLocation DeclStart, 9194 Declarator &D, Expr *BitfieldWidth, 9195 tok::ObjCKeywordKind Visibility) { 9196 9197 IdentifierInfo *II = D.getIdentifier(); 9198 Expr *BitWidth = (Expr*)BitfieldWidth; 9199 SourceLocation Loc = DeclStart; 9200 if (II) Loc = D.getIdentifierLoc(); 9201 9202 // FIXME: Unnamed fields can be handled in various different ways, for 9203 // example, unnamed unions inject all members into the struct namespace! 9204 9205 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9206 QualType T = TInfo->getType(); 9207 9208 if (BitWidth) { 9209 // 6.7.2.1p3, 6.7.2.1p4 9210 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9211 if (!BitWidth) 9212 D.setInvalidType(); 9213 } else { 9214 // Not a bitfield. 9215 9216 // validate II. 9217 9218 } 9219 if (T->isReferenceType()) { 9220 Diag(Loc, diag::err_ivar_reference_type); 9221 D.setInvalidType(); 9222 } 9223 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9224 // than a variably modified type. 9225 else if (T->isVariablyModifiedType()) { 9226 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9227 D.setInvalidType(); 9228 } 9229 9230 // Get the visibility (access control) for this ivar. 9231 ObjCIvarDecl::AccessControl ac = 9232 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9233 : ObjCIvarDecl::None; 9234 // Must set ivar's DeclContext to its enclosing interface. 9235 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9236 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9237 return 0; 9238 ObjCContainerDecl *EnclosingContext; 9239 if (ObjCImplementationDecl *IMPDecl = 9240 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9241 if (!LangOpts.ObjCNonFragileABI2) { 9242 // Case of ivar declared in an implementation. Context is that of its class. 9243 EnclosingContext = IMPDecl->getClassInterface(); 9244 assert(EnclosingContext && "Implementation has no class interface!"); 9245 } 9246 else 9247 EnclosingContext = EnclosingDecl; 9248 } else { 9249 if (ObjCCategoryDecl *CDecl = 9250 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9251 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9252 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9253 return 0; 9254 } 9255 } 9256 EnclosingContext = EnclosingDecl; 9257 } 9258 9259 // Construct the decl. 9260 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9261 DeclStart, Loc, II, T, 9262 TInfo, ac, (Expr *)BitfieldWidth); 9263 9264 if (II) { 9265 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9266 ForRedeclaration); 9267 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9268 && !isa<TagDecl>(PrevDecl)) { 9269 Diag(Loc, diag::err_duplicate_member) << II; 9270 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9271 NewID->setInvalidDecl(); 9272 } 9273 } 9274 9275 // Process attributes attached to the ivar. 9276 ProcessDeclAttributes(S, NewID, D); 9277 9278 if (D.isInvalidType()) 9279 NewID->setInvalidDecl(); 9280 9281 // In ARC, infer 'retaining' for ivars of retainable type. 9282 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9283 NewID->setInvalidDecl(); 9284 9285 if (D.getDeclSpec().isModulePrivateSpecified()) 9286 NewID->setModulePrivate(); 9287 9288 if (II) { 9289 // FIXME: When interfaces are DeclContexts, we'll need to add 9290 // these to the interface. 9291 S->AddDecl(NewID); 9292 IdResolver.AddDecl(NewID); 9293 } 9294 9295 return NewID; 9296} 9297 9298/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9299/// class and class extensions. For every class @interface and class 9300/// extension @interface, if the last ivar is a bitfield of any type, 9301/// then add an implicit `char :0` ivar to the end of that interface. 9302void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9303 SmallVectorImpl<Decl *> &AllIvarDecls) { 9304 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9305 return; 9306 9307 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9308 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9309 9310 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9311 return; 9312 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9313 if (!ID) { 9314 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9315 if (!CD->IsClassExtension()) 9316 return; 9317 } 9318 // No need to add this to end of @implementation. 9319 else 9320 return; 9321 } 9322 // All conditions are met. Add a new bitfield to the tail end of ivars. 9323 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9324 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9325 9326 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9327 DeclLoc, DeclLoc, 0, 9328 Context.CharTy, 9329 Context.getTrivialTypeSourceInfo(Context.CharTy, 9330 DeclLoc), 9331 ObjCIvarDecl::Private, BW, 9332 true); 9333 AllIvarDecls.push_back(Ivar); 9334} 9335 9336void Sema::ActOnFields(Scope* S, 9337 SourceLocation RecLoc, Decl *EnclosingDecl, 9338 llvm::ArrayRef<Decl *> Fields, 9339 SourceLocation LBrac, SourceLocation RBrac, 9340 AttributeList *Attr) { 9341 assert(EnclosingDecl && "missing record or interface decl"); 9342 9343 // If the decl this is being inserted into is invalid, then it may be a 9344 // redeclaration or some other bogus case. Don't try to add fields to it. 9345 if (EnclosingDecl->isInvalidDecl()) 9346 return; 9347 9348 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9349 9350 // Start counting up the number of named members; make sure to include 9351 // members of anonymous structs and unions in the total. 9352 unsigned NumNamedMembers = 0; 9353 if (Record) { 9354 for (RecordDecl::decl_iterator i = Record->decls_begin(), 9355 e = Record->decls_end(); i != e; i++) { 9356 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i)) 9357 if (IFD->getDeclName()) 9358 ++NumNamedMembers; 9359 } 9360 } 9361 9362 // Verify that all the fields are okay. 9363 SmallVector<FieldDecl*, 32> RecFields; 9364 9365 bool ARCErrReported = false; 9366 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9367 i != end; ++i) { 9368 FieldDecl *FD = cast<FieldDecl>(*i); 9369 9370 // Get the type for the field. 9371 const Type *FDTy = FD->getType().getTypePtr(); 9372 9373 if (!FD->isAnonymousStructOrUnion()) { 9374 // Remember all fields written by the user. 9375 RecFields.push_back(FD); 9376 } 9377 9378 // If the field is already invalid for some reason, don't emit more 9379 // diagnostics about it. 9380 if (FD->isInvalidDecl()) { 9381 EnclosingDecl->setInvalidDecl(); 9382 continue; 9383 } 9384 9385 // C99 6.7.2.1p2: 9386 // A structure or union shall not contain a member with 9387 // incomplete or function type (hence, a structure shall not 9388 // contain an instance of itself, but may contain a pointer to 9389 // an instance of itself), except that the last member of a 9390 // structure with more than one named member may have incomplete 9391 // array type; such a structure (and any union containing, 9392 // possibly recursively, a member that is such a structure) 9393 // shall not be a member of a structure or an element of an 9394 // array. 9395 if (FDTy->isFunctionType()) { 9396 // Field declared as a function. 9397 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9398 << FD->getDeclName(); 9399 FD->setInvalidDecl(); 9400 EnclosingDecl->setInvalidDecl(); 9401 continue; 9402 } else if (FDTy->isIncompleteArrayType() && Record && 9403 ((i + 1 == Fields.end() && !Record->isUnion()) || 9404 ((getLangOptions().MicrosoftExt || 9405 getLangOptions().CPlusPlus) && 9406 (i + 1 == Fields.end() || Record->isUnion())))) { 9407 // Flexible array member. 9408 // Microsoft and g++ is more permissive regarding flexible array. 9409 // It will accept flexible array in union and also 9410 // as the sole element of a struct/class. 9411 if (getLangOptions().MicrosoftExt) { 9412 if (Record->isUnion()) 9413 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9414 << FD->getDeclName(); 9415 else if (Fields.size() == 1) 9416 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9417 << FD->getDeclName() << Record->getTagKind(); 9418 } else if (getLangOptions().CPlusPlus) { 9419 if (Record->isUnion()) 9420 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9421 << FD->getDeclName(); 9422 else if (Fields.size() == 1) 9423 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9424 << FD->getDeclName() << Record->getTagKind(); 9425 } else if (NumNamedMembers < 1) { 9426 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9427 << FD->getDeclName(); 9428 FD->setInvalidDecl(); 9429 EnclosingDecl->setInvalidDecl(); 9430 continue; 9431 } 9432 if (!FD->getType()->isDependentType() && 9433 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9434 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9435 << FD->getDeclName() << FD->getType(); 9436 FD->setInvalidDecl(); 9437 EnclosingDecl->setInvalidDecl(); 9438 continue; 9439 } 9440 // Okay, we have a legal flexible array member at the end of the struct. 9441 if (Record) 9442 Record->setHasFlexibleArrayMember(true); 9443 } else if (!FDTy->isDependentType() && 9444 RequireCompleteType(FD->getLocation(), FD->getType(), 9445 diag::err_field_incomplete)) { 9446 // Incomplete type 9447 FD->setInvalidDecl(); 9448 EnclosingDecl->setInvalidDecl(); 9449 continue; 9450 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9451 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9452 // If this is a member of a union, then entire union becomes "flexible". 9453 if (Record && Record->isUnion()) { 9454 Record->setHasFlexibleArrayMember(true); 9455 } else { 9456 // If this is a struct/class and this is not the last element, reject 9457 // it. Note that GCC supports variable sized arrays in the middle of 9458 // structures. 9459 if (i + 1 != Fields.end()) 9460 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9461 << FD->getDeclName() << FD->getType(); 9462 else { 9463 // We support flexible arrays at the end of structs in 9464 // other structs as an extension. 9465 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9466 << FD->getDeclName(); 9467 if (Record) 9468 Record->setHasFlexibleArrayMember(true); 9469 } 9470 } 9471 } 9472 if (Record && FDTTy->getDecl()->hasObjectMember()) 9473 Record->setHasObjectMember(true); 9474 } else if (FDTy->isObjCObjectType()) { 9475 /// A field cannot be an Objective-c object 9476 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9477 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9478 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9479 FD->setType(T); 9480 } 9481 else if (!getLangOptions().CPlusPlus) { 9482 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9483 // It's an error in ARC if a field has lifetime. 9484 // We don't want to report this in a system header, though, 9485 // so we just make the field unavailable. 9486 // FIXME: that's really not sufficient; we need to make the type 9487 // itself invalid to, say, initialize or copy. 9488 QualType T = FD->getType(); 9489 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9490 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9491 SourceLocation loc = FD->getLocation(); 9492 if (getSourceManager().isInSystemHeader(loc)) { 9493 if (!FD->hasAttr<UnavailableAttr>()) { 9494 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9495 "this system field has retaining ownership")); 9496 } 9497 } else { 9498 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9499 << T->isBlockPointerType(); 9500 } 9501 ARCErrReported = true; 9502 } 9503 } 9504 else if (getLangOptions().ObjC1 && 9505 getLangOptions().getGC() != LangOptions::NonGC && 9506 Record && !Record->hasObjectMember()) { 9507 if (FD->getType()->isObjCObjectPointerType() || 9508 FD->getType().isObjCGCStrong()) 9509 Record->setHasObjectMember(true); 9510 else if (Context.getAsArrayType(FD->getType())) { 9511 QualType BaseType = Context.getBaseElementType(FD->getType()); 9512 if (BaseType->isRecordType() && 9513 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9514 Record->setHasObjectMember(true); 9515 else if (BaseType->isObjCObjectPointerType() || 9516 BaseType.isObjCGCStrong()) 9517 Record->setHasObjectMember(true); 9518 } 9519 } 9520 } 9521 // Keep track of the number of named members. 9522 if (FD->getIdentifier()) 9523 ++NumNamedMembers; 9524 } 9525 9526 // Okay, we successfully defined 'Record'. 9527 if (Record) { 9528 bool Completed = false; 9529 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9530 if (!CXXRecord->isInvalidDecl()) { 9531 // Set access bits correctly on the directly-declared conversions. 9532 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9533 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9534 I != E; ++I) 9535 Convs->setAccess(I, (*I)->getAccess()); 9536 9537 if (!CXXRecord->isDependentType()) { 9538 // Objective-C Automatic Reference Counting: 9539 // If a class has a non-static data member of Objective-C pointer 9540 // type (or array thereof), it is a non-POD type and its 9541 // default constructor (if any), copy constructor, copy assignment 9542 // operator, and destructor are non-trivial. 9543 // 9544 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9545 // However, here we check whether this particular class is only 9546 // non-POD because of the presence of an Objective-C pointer member. 9547 // If so, objects of this type cannot be shared between code compiled 9548 // with instant objects and code compiled with manual retain/release. 9549 if (getLangOptions().ObjCAutoRefCount && 9550 CXXRecord->hasObjectMember() && 9551 CXXRecord->getLinkage() == ExternalLinkage) { 9552 if (CXXRecord->isPOD()) { 9553 Diag(CXXRecord->getLocation(), 9554 diag::warn_arc_non_pod_class_with_object_member) 9555 << CXXRecord; 9556 } else { 9557 // FIXME: Fix-Its would be nice here, but finding a good location 9558 // for them is going to be tricky. 9559 if (CXXRecord->hasTrivialCopyConstructor()) 9560 Diag(CXXRecord->getLocation(), 9561 diag::warn_arc_trivial_member_function_with_object_member) 9562 << CXXRecord << 0; 9563 if (CXXRecord->hasTrivialCopyAssignment()) 9564 Diag(CXXRecord->getLocation(), 9565 diag::warn_arc_trivial_member_function_with_object_member) 9566 << CXXRecord << 1; 9567 if (CXXRecord->hasTrivialDestructor()) 9568 Diag(CXXRecord->getLocation(), 9569 diag::warn_arc_trivial_member_function_with_object_member) 9570 << CXXRecord << 2; 9571 } 9572 } 9573 9574 // Adjust user-defined destructor exception spec. 9575 if (getLangOptions().CPlusPlus0x && 9576 CXXRecord->hasUserDeclaredDestructor()) 9577 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9578 9579 // Add any implicitly-declared members to this class. 9580 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9581 9582 // If we have virtual base classes, we may end up finding multiple 9583 // final overriders for a given virtual function. Check for this 9584 // problem now. 9585 if (CXXRecord->getNumVBases()) { 9586 CXXFinalOverriderMap FinalOverriders; 9587 CXXRecord->getFinalOverriders(FinalOverriders); 9588 9589 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9590 MEnd = FinalOverriders.end(); 9591 M != MEnd; ++M) { 9592 for (OverridingMethods::iterator SO = M->second.begin(), 9593 SOEnd = M->second.end(); 9594 SO != SOEnd; ++SO) { 9595 assert(SO->second.size() > 0 && 9596 "Virtual function without overridding functions?"); 9597 if (SO->second.size() == 1) 9598 continue; 9599 9600 // C++ [class.virtual]p2: 9601 // In a derived class, if a virtual member function of a base 9602 // class subobject has more than one final overrider the 9603 // program is ill-formed. 9604 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9605 << (NamedDecl *)M->first << Record; 9606 Diag(M->first->getLocation(), 9607 diag::note_overridden_virtual_function); 9608 for (OverridingMethods::overriding_iterator 9609 OM = SO->second.begin(), 9610 OMEnd = SO->second.end(); 9611 OM != OMEnd; ++OM) 9612 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9613 << (NamedDecl *)M->first << OM->Method->getParent(); 9614 9615 Record->setInvalidDecl(); 9616 } 9617 } 9618 CXXRecord->completeDefinition(&FinalOverriders); 9619 Completed = true; 9620 } 9621 } 9622 } 9623 } 9624 9625 if (!Completed) 9626 Record->completeDefinition(); 9627 9628 // Now that the record is complete, do any delayed exception spec checks 9629 // we were missing. 9630 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9631 const CXXDestructorDecl *Dtor = 9632 DelayedDestructorExceptionSpecChecks.back().first; 9633 if (Dtor->getParent() != Record) 9634 break; 9635 9636 assert(!Dtor->getParent()->isDependentType() && 9637 "Should not ever add destructors of templates into the list."); 9638 CheckOverridingFunctionExceptionSpec(Dtor, 9639 DelayedDestructorExceptionSpecChecks.back().second); 9640 DelayedDestructorExceptionSpecChecks.pop_back(); 9641 } 9642 9643 } else { 9644 ObjCIvarDecl **ClsFields = 9645 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9646 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9647 ID->setEndOfDefinitionLoc(RBrac); 9648 // Add ivar's to class's DeclContext. 9649 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9650 ClsFields[i]->setLexicalDeclContext(ID); 9651 ID->addDecl(ClsFields[i]); 9652 } 9653 // Must enforce the rule that ivars in the base classes may not be 9654 // duplicates. 9655 if (ID->getSuperClass()) 9656 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9657 } else if (ObjCImplementationDecl *IMPDecl = 9658 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9659 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9660 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9661 // Ivar declared in @implementation never belongs to the implementation. 9662 // Only it is in implementation's lexical context. 9663 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9664 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9665 IMPDecl->setIvarLBraceLoc(LBrac); 9666 IMPDecl->setIvarRBraceLoc(RBrac); 9667 } else if (ObjCCategoryDecl *CDecl = 9668 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9669 // case of ivars in class extension; all other cases have been 9670 // reported as errors elsewhere. 9671 // FIXME. Class extension does not have a LocEnd field. 9672 // CDecl->setLocEnd(RBrac); 9673 // Add ivar's to class extension's DeclContext. 9674 // Diagnose redeclaration of private ivars. 9675 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9676 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9677 if (IDecl) { 9678 if (const ObjCIvarDecl *ClsIvar = 9679 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9680 Diag(ClsFields[i]->getLocation(), 9681 diag::err_duplicate_ivar_declaration); 9682 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9683 continue; 9684 } 9685 for (const ObjCCategoryDecl *ClsExtDecl = 9686 IDecl->getFirstClassExtension(); 9687 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9688 if (const ObjCIvarDecl *ClsExtIvar = 9689 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9690 Diag(ClsFields[i]->getLocation(), 9691 diag::err_duplicate_ivar_declaration); 9692 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9693 continue; 9694 } 9695 } 9696 } 9697 ClsFields[i]->setLexicalDeclContext(CDecl); 9698 CDecl->addDecl(ClsFields[i]); 9699 } 9700 CDecl->setIvarLBraceLoc(LBrac); 9701 CDecl->setIvarRBraceLoc(RBrac); 9702 } 9703 } 9704 9705 if (Attr) 9706 ProcessDeclAttributeList(S, Record, Attr); 9707 9708 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9709 // set the visibility of this record. 9710 if (Record && !Record->getDeclContext()->isRecord()) 9711 AddPushedVisibilityAttribute(Record); 9712} 9713 9714/// \brief Determine whether the given integral value is representable within 9715/// the given type T. 9716static bool isRepresentableIntegerValue(ASTContext &Context, 9717 llvm::APSInt &Value, 9718 QualType T) { 9719 assert(T->isIntegralType(Context) && "Integral type required!"); 9720 unsigned BitWidth = Context.getIntWidth(T); 9721 9722 if (Value.isUnsigned() || Value.isNonNegative()) { 9723 if (T->isSignedIntegerOrEnumerationType()) 9724 --BitWidth; 9725 return Value.getActiveBits() <= BitWidth; 9726 } 9727 return Value.getMinSignedBits() <= BitWidth; 9728} 9729 9730// \brief Given an integral type, return the next larger integral type 9731// (or a NULL type of no such type exists). 9732static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9733 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9734 // enum checking below. 9735 assert(T->isIntegralType(Context) && "Integral type required!"); 9736 const unsigned NumTypes = 4; 9737 QualType SignedIntegralTypes[NumTypes] = { 9738 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9739 }; 9740 QualType UnsignedIntegralTypes[NumTypes] = { 9741 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9742 Context.UnsignedLongLongTy 9743 }; 9744 9745 unsigned BitWidth = Context.getTypeSize(T); 9746 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9747 : UnsignedIntegralTypes; 9748 for (unsigned I = 0; I != NumTypes; ++I) 9749 if (Context.getTypeSize(Types[I]) > BitWidth) 9750 return Types[I]; 9751 9752 return QualType(); 9753} 9754 9755EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9756 EnumConstantDecl *LastEnumConst, 9757 SourceLocation IdLoc, 9758 IdentifierInfo *Id, 9759 Expr *Val) { 9760 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9761 llvm::APSInt EnumVal(IntWidth); 9762 QualType EltTy; 9763 9764 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9765 Val = 0; 9766 9767 if (Val) 9768 Val = DefaultLvalueConversion(Val).take(); 9769 9770 if (Val) { 9771 if (Enum->isDependentType() || Val->isTypeDependent()) 9772 EltTy = Context.DependentTy; 9773 else { 9774 SourceLocation ExpLoc; 9775 if (getLangOptions().CPlusPlus0x && Enum->isFixed() && 9776 !getLangOptions().MicrosoftMode) { 9777 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 9778 // constant-expression in the enumerator-definition shall be a converted 9779 // constant expression of the underlying type. 9780 EltTy = Enum->getIntegerType(); 9781 ExprResult Converted = 9782 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 9783 CCEK_Enumerator); 9784 if (Converted.isInvalid()) 9785 Val = 0; 9786 else 9787 Val = Converted.take(); 9788 } else if (!Val->isValueDependent() && 9789 !(Val = VerifyIntegerConstantExpression(Val, 9790 &EnumVal).take())) { 9791 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9792 } else { 9793 if (Enum->isFixed()) { 9794 EltTy = Enum->getIntegerType(); 9795 9796 // In Obj-C and Microsoft mode, require the enumeration value to be 9797 // representable in the underlying type of the enumeration. In C++11, 9798 // we perform a non-narrowing conversion as part of converted constant 9799 // expression checking. 9800 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9801 if (getLangOptions().MicrosoftMode) { 9802 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9803 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9804 } else 9805 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 9806 } else 9807 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9808 } else if (getLangOptions().CPlusPlus) { 9809 // C++11 [dcl.enum]p5: 9810 // If the underlying type is not fixed, the type of each enumerator 9811 // is the type of its initializing value: 9812 // - If an initializer is specified for an enumerator, the 9813 // initializing value has the same type as the expression. 9814 EltTy = Val->getType(); 9815 } else { 9816 // C99 6.7.2.2p2: 9817 // The expression that defines the value of an enumeration constant 9818 // shall be an integer constant expression that has a value 9819 // representable as an int. 9820 9821 // Complain if the value is not representable in an int. 9822 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9823 Diag(IdLoc, diag::ext_enum_value_not_int) 9824 << EnumVal.toString(10) << Val->getSourceRange() 9825 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9826 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9827 // Force the type of the expression to 'int'. 9828 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9829 } 9830 EltTy = Val->getType(); 9831 } 9832 } 9833 } 9834 } 9835 9836 if (!Val) { 9837 if (Enum->isDependentType()) 9838 EltTy = Context.DependentTy; 9839 else if (!LastEnumConst) { 9840 // C++0x [dcl.enum]p5: 9841 // If the underlying type is not fixed, the type of each enumerator 9842 // is the type of its initializing value: 9843 // - If no initializer is specified for the first enumerator, the 9844 // initializing value has an unspecified integral type. 9845 // 9846 // GCC uses 'int' for its unspecified integral type, as does 9847 // C99 6.7.2.2p3. 9848 if (Enum->isFixed()) { 9849 EltTy = Enum->getIntegerType(); 9850 } 9851 else { 9852 EltTy = Context.IntTy; 9853 } 9854 } else { 9855 // Assign the last value + 1. 9856 EnumVal = LastEnumConst->getInitVal(); 9857 ++EnumVal; 9858 EltTy = LastEnumConst->getType(); 9859 9860 // Check for overflow on increment. 9861 if (EnumVal < LastEnumConst->getInitVal()) { 9862 // C++0x [dcl.enum]p5: 9863 // If the underlying type is not fixed, the type of each enumerator 9864 // is the type of its initializing value: 9865 // 9866 // - Otherwise the type of the initializing value is the same as 9867 // the type of the initializing value of the preceding enumerator 9868 // unless the incremented value is not representable in that type, 9869 // in which case the type is an unspecified integral type 9870 // sufficient to contain the incremented value. If no such type 9871 // exists, the program is ill-formed. 9872 QualType T = getNextLargerIntegralType(Context, EltTy); 9873 if (T.isNull() || Enum->isFixed()) { 9874 // There is no integral type larger enough to represent this 9875 // value. Complain, then allow the value to wrap around. 9876 EnumVal = LastEnumConst->getInitVal(); 9877 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9878 ++EnumVal; 9879 if (Enum->isFixed()) 9880 // When the underlying type is fixed, this is ill-formed. 9881 Diag(IdLoc, diag::err_enumerator_wrapped) 9882 << EnumVal.toString(10) 9883 << EltTy; 9884 else 9885 Diag(IdLoc, diag::warn_enumerator_too_large) 9886 << EnumVal.toString(10); 9887 } else { 9888 EltTy = T; 9889 } 9890 9891 // Retrieve the last enumerator's value, extent that type to the 9892 // type that is supposed to be large enough to represent the incremented 9893 // value, then increment. 9894 EnumVal = LastEnumConst->getInitVal(); 9895 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9896 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9897 ++EnumVal; 9898 9899 // If we're not in C++, diagnose the overflow of enumerator values, 9900 // which in C99 means that the enumerator value is not representable in 9901 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9902 // permits enumerator values that are representable in some larger 9903 // integral type. 9904 if (!getLangOptions().CPlusPlus && !T.isNull()) 9905 Diag(IdLoc, diag::warn_enum_value_overflow); 9906 } else if (!getLangOptions().CPlusPlus && 9907 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9908 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9909 Diag(IdLoc, diag::ext_enum_value_not_int) 9910 << EnumVal.toString(10) << 1; 9911 } 9912 } 9913 } 9914 9915 if (!EltTy->isDependentType()) { 9916 // Make the enumerator value match the signedness and size of the 9917 // enumerator's type. 9918 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); 9919 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9920 } 9921 9922 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9923 Val, EnumVal); 9924} 9925 9926 9927Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9928 SourceLocation IdLoc, IdentifierInfo *Id, 9929 AttributeList *Attr, 9930 SourceLocation EqualLoc, Expr *Val) { 9931 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9932 EnumConstantDecl *LastEnumConst = 9933 cast_or_null<EnumConstantDecl>(lastEnumConst); 9934 9935 // The scope passed in may not be a decl scope. Zip up the scope tree until 9936 // we find one that is. 9937 S = getNonFieldDeclScope(S); 9938 9939 // Verify that there isn't already something declared with this name in this 9940 // scope. 9941 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9942 ForRedeclaration); 9943 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9944 // Maybe we will complain about the shadowed template parameter. 9945 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9946 // Just pretend that we didn't see the previous declaration. 9947 PrevDecl = 0; 9948 } 9949 9950 if (PrevDecl) { 9951 // When in C++, we may get a TagDecl with the same name; in this case the 9952 // enum constant will 'hide' the tag. 9953 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9954 "Received TagDecl when not in C++!"); 9955 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9956 if (isa<EnumConstantDecl>(PrevDecl)) 9957 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9958 else 9959 Diag(IdLoc, diag::err_redefinition) << Id; 9960 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9961 return 0; 9962 } 9963 } 9964 9965 // C++ [class.mem]p13: 9966 // If T is the name of a class, then each of the following shall have a 9967 // name different from T: 9968 // - every enumerator of every member of class T that is an enumerated 9969 // type 9970 if (CXXRecordDecl *Record 9971 = dyn_cast<CXXRecordDecl>( 9972 TheEnumDecl->getDeclContext()->getRedeclContext())) 9973 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9974 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9975 9976 EnumConstantDecl *New = 9977 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9978 9979 if (New) { 9980 // Process attributes. 9981 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9982 9983 // Register this decl in the current scope stack. 9984 New->setAccess(TheEnumDecl->getAccess()); 9985 PushOnScopeChains(New, S); 9986 } 9987 9988 return New; 9989} 9990 9991void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9992 SourceLocation RBraceLoc, Decl *EnumDeclX, 9993 Decl **Elements, unsigned NumElements, 9994 Scope *S, AttributeList *Attr) { 9995 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9996 QualType EnumType = Context.getTypeDeclType(Enum); 9997 9998 if (Attr) 9999 ProcessDeclAttributeList(S, Enum, Attr); 10000 10001 if (Enum->isDependentType()) { 10002 for (unsigned i = 0; i != NumElements; ++i) { 10003 EnumConstantDecl *ECD = 10004 cast_or_null<EnumConstantDecl>(Elements[i]); 10005 if (!ECD) continue; 10006 10007 ECD->setType(EnumType); 10008 } 10009 10010 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 10011 return; 10012 } 10013 10014 // TODO: If the result value doesn't fit in an int, it must be a long or long 10015 // long value. ISO C does not support this, but GCC does as an extension, 10016 // emit a warning. 10017 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10018 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 10019 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 10020 10021 // Verify that all the values are okay, compute the size of the values, and 10022 // reverse the list. 10023 unsigned NumNegativeBits = 0; 10024 unsigned NumPositiveBits = 0; 10025 10026 // Keep track of whether all elements have type int. 10027 bool AllElementsInt = true; 10028 10029 for (unsigned i = 0; i != NumElements; ++i) { 10030 EnumConstantDecl *ECD = 10031 cast_or_null<EnumConstantDecl>(Elements[i]); 10032 if (!ECD) continue; // Already issued a diagnostic. 10033 10034 const llvm::APSInt &InitVal = ECD->getInitVal(); 10035 10036 // Keep track of the size of positive and negative values. 10037 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 10038 NumPositiveBits = std::max(NumPositiveBits, 10039 (unsigned)InitVal.getActiveBits()); 10040 else 10041 NumNegativeBits = std::max(NumNegativeBits, 10042 (unsigned)InitVal.getMinSignedBits()); 10043 10044 // Keep track of whether every enum element has type int (very commmon). 10045 if (AllElementsInt) 10046 AllElementsInt = ECD->getType() == Context.IntTy; 10047 } 10048 10049 // Figure out the type that should be used for this enum. 10050 QualType BestType; 10051 unsigned BestWidth; 10052 10053 // C++0x N3000 [conv.prom]p3: 10054 // An rvalue of an unscoped enumeration type whose underlying 10055 // type is not fixed can be converted to an rvalue of the first 10056 // of the following types that can represent all the values of 10057 // the enumeration: int, unsigned int, long int, unsigned long 10058 // int, long long int, or unsigned long long int. 10059 // C99 6.4.4.3p2: 10060 // An identifier declared as an enumeration constant has type int. 10061 // The C99 rule is modified by a gcc extension 10062 QualType BestPromotionType; 10063 10064 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 10065 // -fshort-enums is the equivalent to specifying the packed attribute on all 10066 // enum definitions. 10067 if (LangOpts.ShortEnums) 10068 Packed = true; 10069 10070 if (Enum->isFixed()) { 10071 BestType = Enum->getIntegerType(); 10072 if (BestType->isPromotableIntegerType()) 10073 BestPromotionType = Context.getPromotedIntegerType(BestType); 10074 else 10075 BestPromotionType = BestType; 10076 // We don't need to set BestWidth, because BestType is going to be the type 10077 // of the enumerators, but we do anyway because otherwise some compilers 10078 // warn that it might be used uninitialized. 10079 BestWidth = CharWidth; 10080 } 10081 else if (NumNegativeBits) { 10082 // If there is a negative value, figure out the smallest integer type (of 10083 // int/long/longlong) that fits. 10084 // If it's packed, check also if it fits a char or a short. 10085 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 10086 BestType = Context.SignedCharTy; 10087 BestWidth = CharWidth; 10088 } else if (Packed && NumNegativeBits <= ShortWidth && 10089 NumPositiveBits < ShortWidth) { 10090 BestType = Context.ShortTy; 10091 BestWidth = ShortWidth; 10092 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 10093 BestType = Context.IntTy; 10094 BestWidth = IntWidth; 10095 } else { 10096 BestWidth = Context.getTargetInfo().getLongWidth(); 10097 10098 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 10099 BestType = Context.LongTy; 10100 } else { 10101 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10102 10103 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 10104 Diag(Enum->getLocation(), diag::warn_enum_too_large); 10105 BestType = Context.LongLongTy; 10106 } 10107 } 10108 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 10109 } else { 10110 // If there is no negative value, figure out the smallest type that fits 10111 // all of the enumerator values. 10112 // If it's packed, check also if it fits a char or a short. 10113 if (Packed && NumPositiveBits <= CharWidth) { 10114 BestType = Context.UnsignedCharTy; 10115 BestPromotionType = Context.IntTy; 10116 BestWidth = CharWidth; 10117 } else if (Packed && NumPositiveBits <= ShortWidth) { 10118 BestType = Context.UnsignedShortTy; 10119 BestPromotionType = Context.IntTy; 10120 BestWidth = ShortWidth; 10121 } else if (NumPositiveBits <= IntWidth) { 10122 BestType = Context.UnsignedIntTy; 10123 BestWidth = IntWidth; 10124 BestPromotionType 10125 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 10126 ? Context.UnsignedIntTy : Context.IntTy; 10127 } else if (NumPositiveBits <= 10128 (BestWidth = Context.getTargetInfo().getLongWidth())) { 10129 BestType = Context.UnsignedLongTy; 10130 BestPromotionType 10131 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 10132 ? Context.UnsignedLongTy : Context.LongTy; 10133 } else { 10134 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10135 assert(NumPositiveBits <= BestWidth && 10136 "How could an initializer get larger than ULL?"); 10137 BestType = Context.UnsignedLongLongTy; 10138 BestPromotionType 10139 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 10140 ? Context.UnsignedLongLongTy : Context.LongLongTy; 10141 } 10142 } 10143 10144 // Loop over all of the enumerator constants, changing their types to match 10145 // the type of the enum if needed. 10146 for (unsigned i = 0; i != NumElements; ++i) { 10147 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10148 if (!ECD) continue; // Already issued a diagnostic. 10149 10150 // Standard C says the enumerators have int type, but we allow, as an 10151 // extension, the enumerators to be larger than int size. If each 10152 // enumerator value fits in an int, type it as an int, otherwise type it the 10153 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 10154 // that X has type 'int', not 'unsigned'. 10155 10156 // Determine whether the value fits into an int. 10157 llvm::APSInt InitVal = ECD->getInitVal(); 10158 10159 // If it fits into an integer type, force it. Otherwise force it to match 10160 // the enum decl type. 10161 QualType NewTy; 10162 unsigned NewWidth; 10163 bool NewSign; 10164 if (!getLangOptions().CPlusPlus && 10165 !Enum->isFixed() && 10166 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 10167 NewTy = Context.IntTy; 10168 NewWidth = IntWidth; 10169 NewSign = true; 10170 } else if (ECD->getType() == BestType) { 10171 // Already the right type! 10172 if (getLangOptions().CPlusPlus) 10173 // C++ [dcl.enum]p4: Following the closing brace of an 10174 // enum-specifier, each enumerator has the type of its 10175 // enumeration. 10176 ECD->setType(EnumType); 10177 continue; 10178 } else { 10179 NewTy = BestType; 10180 NewWidth = BestWidth; 10181 NewSign = BestType->isSignedIntegerOrEnumerationType(); 10182 } 10183 10184 // Adjust the APSInt value. 10185 InitVal = InitVal.extOrTrunc(NewWidth); 10186 InitVal.setIsSigned(NewSign); 10187 ECD->setInitVal(InitVal); 10188 10189 // Adjust the Expr initializer and type. 10190 if (ECD->getInitExpr() && 10191 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10192 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10193 CK_IntegralCast, 10194 ECD->getInitExpr(), 10195 /*base paths*/ 0, 10196 VK_RValue)); 10197 if (getLangOptions().CPlusPlus) 10198 // C++ [dcl.enum]p4: Following the closing brace of an 10199 // enum-specifier, each enumerator has the type of its 10200 // enumeration. 10201 ECD->setType(EnumType); 10202 else 10203 ECD->setType(NewTy); 10204 } 10205 10206 Enum->completeDefinition(BestType, BestPromotionType, 10207 NumPositiveBits, NumNegativeBits); 10208 10209 // If we're declaring a function, ensure this decl isn't forgotten about - 10210 // it needs to go into the function scope. 10211 if (InFunctionDeclarator) 10212 DeclsInPrototypeScope.push_back(Enum); 10213 10214} 10215 10216Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10217 SourceLocation StartLoc, 10218 SourceLocation EndLoc) { 10219 StringLiteral *AsmString = cast<StringLiteral>(expr); 10220 10221 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10222 AsmString, StartLoc, 10223 EndLoc); 10224 CurContext->addDecl(New); 10225 return New; 10226} 10227 10228DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10229 SourceLocation ImportLoc, 10230 ModuleIdPath Path) { 10231 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10232 Module::AllVisible, 10233 /*IsIncludeDirective=*/false); 10234 if (!Mod) 10235 return true; 10236 10237 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10238 Module *ModCheck = Mod; 10239 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10240 // If we've run out of module parents, just drop the remaining identifiers. 10241 // We need the length to be consistent. 10242 if (!ModCheck) 10243 break; 10244 ModCheck = ModCheck->Parent; 10245 10246 IdentifierLocs.push_back(Path[I].second); 10247 } 10248 10249 ImportDecl *Import = ImportDecl::Create(Context, 10250 Context.getTranslationUnitDecl(), 10251 AtLoc.isValid()? AtLoc : ImportLoc, 10252 Mod, IdentifierLocs); 10253 Context.getTranslationUnitDecl()->addDecl(Import); 10254 return Import; 10255} 10256 10257void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name, 10258 IdentifierInfo* AliasName, 10259 SourceLocation PragmaLoc, 10260 SourceLocation NameLoc, 10261 SourceLocation AliasNameLoc) { 10262 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, 10263 LookupOrdinaryName); 10264 AsmLabelAttr *Attr = 10265 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName()); 10266 10267 if (PrevDecl) 10268 PrevDecl->addAttr(Attr); 10269 else 10270 (void)ExtnameUndeclaredIdentifiers.insert( 10271 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr)); 10272} 10273 10274void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10275 SourceLocation PragmaLoc, 10276 SourceLocation NameLoc) { 10277 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10278 10279 if (PrevDecl) { 10280 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10281 } else { 10282 (void)WeakUndeclaredIdentifiers.insert( 10283 std::pair<IdentifierInfo*,WeakInfo> 10284 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10285 } 10286} 10287 10288void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10289 IdentifierInfo* AliasName, 10290 SourceLocation PragmaLoc, 10291 SourceLocation NameLoc, 10292 SourceLocation AliasNameLoc) { 10293 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10294 LookupOrdinaryName); 10295 WeakInfo W = WeakInfo(Name, NameLoc); 10296 10297 if (PrevDecl) { 10298 if (!PrevDecl->hasAttr<AliasAttr>()) 10299 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10300 DeclApplyPragmaWeak(TUScope, ND, W); 10301 } else { 10302 (void)WeakUndeclaredIdentifiers.insert( 10303 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10304 } 10305} 10306 10307Decl *Sema::getObjCDeclContext() const { 10308 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10309} 10310 10311AvailabilityResult Sema::getCurContextAvailability() const { 10312 const Decl *D = cast<Decl>(getCurLexicalContext()); 10313 // A category implicitly has the availability of the interface. 10314 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10315 D = CatD->getClassInterface(); 10316 10317 return D->getAvailability(); 10318} 10319