SemaDecl.cpp revision ed9d84a2112e2bd56befb5f4fa8fc5bdf71fafa3
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/APValue.h" 22#include "clang/AST/ASTConsumer.h" 23#include "clang/AST/ASTContext.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/EvaluatedExprVisitor.h" 29#include "clang/AST/ExprCXX.h" 30#include "clang/AST/StmtCXX.h" 31#include "clang/AST/CharUnits.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Parse/ParseDiagnostic.h" 35#include "clang/Basic/PartialDiagnostic.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/Triple.h" 43#include <algorithm> 44#include <cstring> 45#include <functional> 46using namespace clang; 47using namespace sema; 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 50 if (OwnedType) { 51 Decl *Group[2] = { OwnedType, Ptr }; 52 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 53 } 54 55 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 56} 57 58/// \brief If the identifier refers to a type name within this scope, 59/// return the declaration of that type. 60/// 61/// This routine performs ordinary name lookup of the identifier II 62/// within the given scope, with optional C++ scope specifier SS, to 63/// determine whether the name refers to a type. If so, returns an 64/// opaque pointer (actually a QualType) corresponding to that 65/// type. Otherwise, returns NULL. 66/// 67/// If name lookup results in an ambiguity, this routine will complain 68/// and then return NULL. 69ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 70 Scope *S, CXXScopeSpec *SS, 71 bool isClassName, bool HasTrailingDot, 72 ParsedType ObjectTypePtr, 73 bool WantNontrivialTypeSourceInfo) { 74 // Determine where we will perform name lookup. 75 DeclContext *LookupCtx = 0; 76 if (ObjectTypePtr) { 77 QualType ObjectType = ObjectTypePtr.get(); 78 if (ObjectType->isRecordType()) 79 LookupCtx = computeDeclContext(ObjectType); 80 } else if (SS && SS->isNotEmpty()) { 81 LookupCtx = computeDeclContext(*SS, false); 82 83 if (!LookupCtx) { 84 if (isDependentScopeSpecifier(*SS)) { 85 // C++ [temp.res]p3: 86 // A qualified-id that refers to a type and in which the 87 // nested-name-specifier depends on a template-parameter (14.6.2) 88 // shall be prefixed by the keyword typename to indicate that the 89 // qualified-id denotes a type, forming an 90 // elaborated-type-specifier (7.1.5.3). 91 // 92 // We therefore do not perform any name lookup if the result would 93 // refer to a member of an unknown specialization. 94 if (!isClassName) 95 return ParsedType(); 96 97 // We know from the grammar that this name refers to a type, 98 // so build a dependent node to describe the type. 99 if (WantNontrivialTypeSourceInfo) 100 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 101 102 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 103 QualType T = 104 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 105 II, NameLoc); 106 107 return ParsedType::make(T); 108 } 109 110 return ParsedType(); 111 } 112 113 if (!LookupCtx->isDependentContext() && 114 RequireCompleteDeclContext(*SS, LookupCtx)) 115 return ParsedType(); 116 } 117 118 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 119 // lookup for class-names. 120 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 121 LookupOrdinaryName; 122 LookupResult Result(*this, &II, NameLoc, Kind); 123 if (LookupCtx) { 124 // Perform "qualified" name lookup into the declaration context we 125 // computed, which is either the type of the base of a member access 126 // expression or the declaration context associated with a prior 127 // nested-name-specifier. 128 LookupQualifiedName(Result, LookupCtx); 129 130 if (ObjectTypePtr && Result.empty()) { 131 // C++ [basic.lookup.classref]p3: 132 // If the unqualified-id is ~type-name, the type-name is looked up 133 // in the context of the entire postfix-expression. If the type T of 134 // the object expression is of a class type C, the type-name is also 135 // looked up in the scope of class C. At least one of the lookups shall 136 // find a name that refers to (possibly cv-qualified) T. 137 LookupName(Result, S); 138 } 139 } else { 140 // Perform unqualified name lookup. 141 LookupName(Result, S); 142 } 143 144 NamedDecl *IIDecl = 0; 145 switch (Result.getResultKind()) { 146 case LookupResult::NotFound: 147 case LookupResult::NotFoundInCurrentInstantiation: 148 case LookupResult::FoundOverloaded: 149 case LookupResult::FoundUnresolvedValue: 150 Result.suppressDiagnostics(); 151 return ParsedType(); 152 153 case LookupResult::Ambiguous: 154 // Recover from type-hiding ambiguities by hiding the type. We'll 155 // do the lookup again when looking for an object, and we can 156 // diagnose the error then. If we don't do this, then the error 157 // about hiding the type will be immediately followed by an error 158 // that only makes sense if the identifier was treated like a type. 159 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 160 Result.suppressDiagnostics(); 161 return ParsedType(); 162 } 163 164 // Look to see if we have a type anywhere in the list of results. 165 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 166 Res != ResEnd; ++Res) { 167 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 168 if (!IIDecl || 169 (*Res)->getLocation().getRawEncoding() < 170 IIDecl->getLocation().getRawEncoding()) 171 IIDecl = *Res; 172 } 173 } 174 175 if (!IIDecl) { 176 // None of the entities we found is a type, so there is no way 177 // to even assume that the result is a type. In this case, don't 178 // complain about the ambiguity. The parser will either try to 179 // perform this lookup again (e.g., as an object name), which 180 // will produce the ambiguity, or will complain that it expected 181 // a type name. 182 Result.suppressDiagnostics(); 183 return ParsedType(); 184 } 185 186 // We found a type within the ambiguous lookup; diagnose the 187 // ambiguity and then return that type. This might be the right 188 // answer, or it might not be, but it suppresses any attempt to 189 // perform the name lookup again. 190 break; 191 192 case LookupResult::Found: 193 IIDecl = Result.getFoundDecl(); 194 break; 195 } 196 197 assert(IIDecl && "Didn't find decl"); 198 199 QualType T; 200 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 201 DiagnoseUseOfDecl(IIDecl, NameLoc); 202 203 if (T.isNull()) 204 T = Context.getTypeDeclType(TD); 205 206 if (SS && SS->isNotEmpty()) { 207 if (WantNontrivialTypeSourceInfo) { 208 // Construct a type with type-source information. 209 TypeLocBuilder Builder; 210 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 211 212 T = getElaboratedType(ETK_None, *SS, T); 213 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 214 ElabTL.setKeywordLoc(SourceLocation()); 215 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 216 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 217 } else { 218 T = getElaboratedType(ETK_None, *SS, T); 219 } 220 } 221 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 222 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 223 if (!HasTrailingDot) 224 T = Context.getObjCInterfaceType(IDecl); 225 } 226 227 if (T.isNull()) { 228 // If it's not plausibly a type, suppress diagnostics. 229 Result.suppressDiagnostics(); 230 return ParsedType(); 231 } 232 return ParsedType::make(T); 233} 234 235/// isTagName() - This method is called *for error recovery purposes only* 236/// to determine if the specified name is a valid tag name ("struct foo"). If 237/// so, this returns the TST for the tag corresponding to it (TST_enum, 238/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 239/// where the user forgot to specify the tag. 240DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 241 // Do a tag name lookup in this scope. 242 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 243 LookupName(R, S, false); 244 R.suppressDiagnostics(); 245 if (R.getResultKind() == LookupResult::Found) 246 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 247 switch (TD->getTagKind()) { 248 default: return DeclSpec::TST_unspecified; 249 case TTK_Struct: return DeclSpec::TST_struct; 250 case TTK_Union: return DeclSpec::TST_union; 251 case TTK_Class: return DeclSpec::TST_class; 252 case TTK_Enum: return DeclSpec::TST_enum; 253 } 254 } 255 256 return DeclSpec::TST_unspecified; 257} 258 259/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 260/// if a CXXScopeSpec's type is equal to the type of one of the base classes 261/// then downgrade the missing typename error to a warning. 262/// This is needed for MSVC compatibility; Example: 263/// @code 264/// template<class T> class A { 265/// public: 266/// typedef int TYPE; 267/// }; 268/// template<class T> class B : public A<T> { 269/// public: 270/// A<T>::TYPE a; // no typename required because A<T> is a base class. 271/// }; 272/// @endcode 273bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 274 if (CurContext->isRecord()) { 275 const Type *Ty = SS->getScopeRep()->getAsType(); 276 277 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 278 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 279 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 280 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 281 return true; 282 } 283 return false; 284} 285 286bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 287 SourceLocation IILoc, 288 Scope *S, 289 CXXScopeSpec *SS, 290 ParsedType &SuggestedType) { 291 // We don't have anything to suggest (yet). 292 SuggestedType = ParsedType(); 293 294 // There may have been a typo in the name of the type. Look up typo 295 // results, in case we have something that we can suggest. 296 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 297 LookupOrdinaryName, S, SS, NULL, 298 false, CTC_Type)) { 299 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 300 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 301 302 if (Corrected.isKeyword()) { 303 // We corrected to a keyword. 304 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 305 Diag(IILoc, diag::err_unknown_typename_suggest) 306 << &II << CorrectedQuotedStr; 307 return true; 308 } else { 309 NamedDecl *Result = Corrected.getCorrectionDecl(); 310 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 311 !Result->isInvalidDecl()) { 312 // We found a similarly-named type or interface; suggest that. 313 if (!SS || !SS->isSet()) 314 Diag(IILoc, diag::err_unknown_typename_suggest) 315 << &II << CorrectedQuotedStr 316 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 317 else if (DeclContext *DC = computeDeclContext(*SS, false)) 318 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 319 << &II << DC << CorrectedQuotedStr << SS->getRange() 320 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 321 else 322 llvm_unreachable("could not have corrected a typo here"); 323 324 Diag(Result->getLocation(), diag::note_previous_decl) 325 << CorrectedQuotedStr; 326 327 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 328 false, false, ParsedType(), 329 /*NonTrivialTypeSourceInfo=*/true); 330 return true; 331 } 332 } 333 } 334 335 if (getLangOptions().CPlusPlus) { 336 // See if II is a class template that the user forgot to pass arguments to. 337 UnqualifiedId Name; 338 Name.setIdentifier(&II, IILoc); 339 CXXScopeSpec EmptySS; 340 TemplateTy TemplateResult; 341 bool MemberOfUnknownSpecialization; 342 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 343 Name, ParsedType(), true, TemplateResult, 344 MemberOfUnknownSpecialization) == TNK_Type_template) { 345 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 346 Diag(IILoc, diag::err_template_missing_args) << TplName; 347 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 348 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 349 << TplDecl->getTemplateParameters()->getSourceRange(); 350 } 351 return true; 352 } 353 } 354 355 // FIXME: Should we move the logic that tries to recover from a missing tag 356 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 357 358 if (!SS || (!SS->isSet() && !SS->isInvalid())) 359 Diag(IILoc, diag::err_unknown_typename) << &II; 360 else if (DeclContext *DC = computeDeclContext(*SS, false)) 361 Diag(IILoc, diag::err_typename_nested_not_found) 362 << &II << DC << SS->getRange(); 363 else if (isDependentScopeSpecifier(*SS)) { 364 unsigned DiagID = diag::err_typename_missing; 365 if (getLangOptions().Microsoft && isMicrosoftMissingTypename(SS)) 366 DiagID = diag::warn_typename_missing; 367 368 Diag(SS->getRange().getBegin(), DiagID) 369 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 370 << SourceRange(SS->getRange().getBegin(), IILoc) 371 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 372 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 373 } else { 374 assert(SS && SS->isInvalid() && 375 "Invalid scope specifier has already been diagnosed"); 376 } 377 378 return true; 379} 380 381/// \brief Determine whether the given result set contains either a type name 382/// or 383static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 384 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 385 NextToken.is(tok::less); 386 387 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 388 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 389 return true; 390 391 if (CheckTemplate && isa<TemplateDecl>(*I)) 392 return true; 393 } 394 395 return false; 396} 397 398Sema::NameClassification Sema::ClassifyName(Scope *S, 399 CXXScopeSpec &SS, 400 IdentifierInfo *&Name, 401 SourceLocation NameLoc, 402 const Token &NextToken) { 403 DeclarationNameInfo NameInfo(Name, NameLoc); 404 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 405 406 if (NextToken.is(tok::coloncolon)) { 407 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 408 QualType(), false, SS, 0, false); 409 410 } 411 412 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 413 LookupParsedName(Result, S, &SS, !CurMethod); 414 415 // Perform lookup for Objective-C instance variables (including automatically 416 // synthesized instance variables), if we're in an Objective-C method. 417 // FIXME: This lookup really, really needs to be folded in to the normal 418 // unqualified lookup mechanism. 419 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 420 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 421 if (E.get() || E.isInvalid()) 422 return E; 423 } 424 425 bool SecondTry = false; 426 bool IsFilteredTemplateName = false; 427 428Corrected: 429 switch (Result.getResultKind()) { 430 case LookupResult::NotFound: 431 // If an unqualified-id is followed by a '(', then we have a function 432 // call. 433 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 434 // In C++, this is an ADL-only call. 435 // FIXME: Reference? 436 if (getLangOptions().CPlusPlus) 437 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 438 439 // C90 6.3.2.2: 440 // If the expression that precedes the parenthesized argument list in a 441 // function call consists solely of an identifier, and if no 442 // declaration is visible for this identifier, the identifier is 443 // implicitly declared exactly as if, in the innermost block containing 444 // the function call, the declaration 445 // 446 // extern int identifier (); 447 // 448 // appeared. 449 // 450 // We also allow this in C99 as an extension. 451 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 452 Result.addDecl(D); 453 Result.resolveKind(); 454 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 455 } 456 } 457 458 // In C, we first see whether there is a tag type by the same name, in 459 // which case it's likely that the user just forget to write "enum", 460 // "struct", or "union". 461 if (!getLangOptions().CPlusPlus && !SecondTry) { 462 Result.clear(LookupTagName); 463 LookupParsedName(Result, S, &SS); 464 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 465 const char *TagName = 0; 466 const char *FixItTagName = 0; 467 switch (Tag->getTagKind()) { 468 case TTK_Class: 469 TagName = "class"; 470 FixItTagName = "class "; 471 break; 472 473 case TTK_Enum: 474 TagName = "enum"; 475 FixItTagName = "enum "; 476 break; 477 478 case TTK_Struct: 479 TagName = "struct"; 480 FixItTagName = "struct "; 481 break; 482 483 case TTK_Union: 484 TagName = "union"; 485 FixItTagName = "union "; 486 break; 487 } 488 489 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 490 << Name << TagName << getLangOptions().CPlusPlus 491 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 492 break; 493 } 494 495 Result.clear(LookupOrdinaryName); 496 } 497 498 // Perform typo correction to determine if there is another name that is 499 // close to this name. 500 if (!SecondTry) { 501 SecondTry = true; 502 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 503 Result.getLookupKind(), S, &SS)) { 504 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 505 unsigned QualifiedDiag = diag::err_no_member_suggest; 506 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 507 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 508 509 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 510 NamedDecl *UnderlyingFirstDecl 511 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 512 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 513 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 514 UnqualifiedDiag = diag::err_no_template_suggest; 515 QualifiedDiag = diag::err_no_member_template_suggest; 516 } else if (UnderlyingFirstDecl && 517 (isa<TypeDecl>(UnderlyingFirstDecl) || 518 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 519 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 520 UnqualifiedDiag = diag::err_unknown_typename_suggest; 521 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 522 } 523 524 if (SS.isEmpty()) 525 Diag(NameLoc, UnqualifiedDiag) 526 << Name << CorrectedQuotedStr 527 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 528 else 529 Diag(NameLoc, QualifiedDiag) 530 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 531 << SS.getRange() 532 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 533 534 // Update the name, so that the caller has the new name. 535 Name = Corrected.getCorrectionAsIdentifierInfo(); 536 537 // Also update the LookupResult... 538 // FIXME: This should probably go away at some point 539 Result.clear(); 540 Result.setLookupName(Corrected.getCorrection()); 541 if (FirstDecl) Result.addDecl(FirstDecl); 542 543 // Typo correction corrected to a keyword. 544 if (Corrected.isKeyword()) 545 return Corrected.getCorrectionAsIdentifierInfo(); 546 547 if (FirstDecl) 548 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 549 << CorrectedQuotedStr; 550 551 // If we found an Objective-C instance variable, let 552 // LookupInObjCMethod build the appropriate expression to 553 // reference the ivar. 554 // FIXME: This is a gross hack. 555 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 556 Result.clear(); 557 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 558 return move(E); 559 } 560 561 goto Corrected; 562 } 563 } 564 565 // We failed to correct; just fall through and let the parser deal with it. 566 Result.suppressDiagnostics(); 567 return NameClassification::Unknown(); 568 569 case LookupResult::NotFoundInCurrentInstantiation: 570 // We performed name lookup into the current instantiation, and there were 571 // dependent bases, so we treat this result the same way as any other 572 // dependent nested-name-specifier. 573 574 // C++ [temp.res]p2: 575 // A name used in a template declaration or definition and that is 576 // dependent on a template-parameter is assumed not to name a type 577 // unless the applicable name lookup finds a type name or the name is 578 // qualified by the keyword typename. 579 // 580 // FIXME: If the next token is '<', we might want to ask the parser to 581 // perform some heroics to see if we actually have a 582 // template-argument-list, which would indicate a missing 'template' 583 // keyword here. 584 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 585 586 case LookupResult::Found: 587 case LookupResult::FoundOverloaded: 588 case LookupResult::FoundUnresolvedValue: 589 break; 590 591 case LookupResult::Ambiguous: 592 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 593 hasAnyAcceptableTemplateNames(Result)) { 594 // C++ [temp.local]p3: 595 // A lookup that finds an injected-class-name (10.2) can result in an 596 // ambiguity in certain cases (for example, if it is found in more than 597 // one base class). If all of the injected-class-names that are found 598 // refer to specializations of the same class template, and if the name 599 // is followed by a template-argument-list, the reference refers to the 600 // class template itself and not a specialization thereof, and is not 601 // ambiguous. 602 // 603 // This filtering can make an ambiguous result into an unambiguous one, 604 // so try again after filtering out template names. 605 FilterAcceptableTemplateNames(Result); 606 if (!Result.isAmbiguous()) { 607 IsFilteredTemplateName = true; 608 break; 609 } 610 } 611 612 // Diagnose the ambiguity and return an error. 613 return NameClassification::Error(); 614 } 615 616 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 617 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 618 // C++ [temp.names]p3: 619 // After name lookup (3.4) finds that a name is a template-name or that 620 // an operator-function-id or a literal- operator-id refers to a set of 621 // overloaded functions any member of which is a function template if 622 // this is followed by a <, the < is always taken as the delimiter of a 623 // template-argument-list and never as the less-than operator. 624 if (!IsFilteredTemplateName) 625 FilterAcceptableTemplateNames(Result); 626 627 if (!Result.empty()) { 628 bool IsFunctionTemplate; 629 TemplateName Template; 630 if (Result.end() - Result.begin() > 1) { 631 IsFunctionTemplate = true; 632 Template = Context.getOverloadedTemplateName(Result.begin(), 633 Result.end()); 634 } else { 635 TemplateDecl *TD 636 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 637 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 638 639 if (SS.isSet() && !SS.isInvalid()) 640 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 641 /*TemplateKeyword=*/false, 642 TD); 643 else 644 Template = TemplateName(TD); 645 } 646 647 if (IsFunctionTemplate) { 648 // Function templates always go through overload resolution, at which 649 // point we'll perform the various checks (e.g., accessibility) we need 650 // to based on which function we selected. 651 Result.suppressDiagnostics(); 652 653 return NameClassification::FunctionTemplate(Template); 654 } 655 656 return NameClassification::TypeTemplate(Template); 657 } 658 } 659 660 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 661 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 662 DiagnoseUseOfDecl(Type, NameLoc); 663 QualType T = Context.getTypeDeclType(Type); 664 return ParsedType::make(T); 665 } 666 667 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 668 if (!Class) { 669 // FIXME: It's unfortunate that we don't have a Type node for handling this. 670 if (ObjCCompatibleAliasDecl *Alias 671 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 672 Class = Alias->getClassInterface(); 673 } 674 675 if (Class) { 676 DiagnoseUseOfDecl(Class, NameLoc); 677 678 if (NextToken.is(tok::period)) { 679 // Interface. <something> is parsed as a property reference expression. 680 // Just return "unknown" as a fall-through for now. 681 Result.suppressDiagnostics(); 682 return NameClassification::Unknown(); 683 } 684 685 QualType T = Context.getObjCInterfaceType(Class); 686 return ParsedType::make(T); 687 } 688 689 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 690 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 691 692 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 693 return BuildDeclarationNameExpr(SS, Result, ADL); 694} 695 696// Determines the context to return to after temporarily entering a 697// context. This depends in an unnecessarily complicated way on the 698// exact ordering of callbacks from the parser. 699DeclContext *Sema::getContainingDC(DeclContext *DC) { 700 701 // Functions defined inline within classes aren't parsed until we've 702 // finished parsing the top-level class, so the top-level class is 703 // the context we'll need to return to. 704 if (isa<FunctionDecl>(DC)) { 705 DC = DC->getLexicalParent(); 706 707 // A function not defined within a class will always return to its 708 // lexical context. 709 if (!isa<CXXRecordDecl>(DC)) 710 return DC; 711 712 // A C++ inline method/friend is parsed *after* the topmost class 713 // it was declared in is fully parsed ("complete"); the topmost 714 // class is the context we need to return to. 715 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 716 DC = RD; 717 718 // Return the declaration context of the topmost class the inline method is 719 // declared in. 720 return DC; 721 } 722 723 return DC->getLexicalParent(); 724} 725 726void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 727 assert(getContainingDC(DC) == CurContext && 728 "The next DeclContext should be lexically contained in the current one."); 729 CurContext = DC; 730 S->setEntity(DC); 731} 732 733void Sema::PopDeclContext() { 734 assert(CurContext && "DeclContext imbalance!"); 735 736 CurContext = getContainingDC(CurContext); 737 assert(CurContext && "Popped translation unit!"); 738} 739 740/// EnterDeclaratorContext - Used when we must lookup names in the context 741/// of a declarator's nested name specifier. 742/// 743void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 744 // C++0x [basic.lookup.unqual]p13: 745 // A name used in the definition of a static data member of class 746 // X (after the qualified-id of the static member) is looked up as 747 // if the name was used in a member function of X. 748 // C++0x [basic.lookup.unqual]p14: 749 // If a variable member of a namespace is defined outside of the 750 // scope of its namespace then any name used in the definition of 751 // the variable member (after the declarator-id) is looked up as 752 // if the definition of the variable member occurred in its 753 // namespace. 754 // Both of these imply that we should push a scope whose context 755 // is the semantic context of the declaration. We can't use 756 // PushDeclContext here because that context is not necessarily 757 // lexically contained in the current context. Fortunately, 758 // the containing scope should have the appropriate information. 759 760 assert(!S->getEntity() && "scope already has entity"); 761 762#ifndef NDEBUG 763 Scope *Ancestor = S->getParent(); 764 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 765 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 766#endif 767 768 CurContext = DC; 769 S->setEntity(DC); 770} 771 772void Sema::ExitDeclaratorContext(Scope *S) { 773 assert(S->getEntity() == CurContext && "Context imbalance!"); 774 775 // Switch back to the lexical context. The safety of this is 776 // enforced by an assert in EnterDeclaratorContext. 777 Scope *Ancestor = S->getParent(); 778 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 779 CurContext = (DeclContext*) Ancestor->getEntity(); 780 781 // We don't need to do anything with the scope, which is going to 782 // disappear. 783} 784 785 786void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 787 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 788 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 789 // We assume that the caller has already called 790 // ActOnReenterTemplateScope 791 FD = TFD->getTemplatedDecl(); 792 } 793 if (!FD) 794 return; 795 796 PushDeclContext(S, FD); 797 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 798 ParmVarDecl *Param = FD->getParamDecl(P); 799 // If the parameter has an identifier, then add it to the scope 800 if (Param->getIdentifier()) { 801 S->AddDecl(Param); 802 IdResolver.AddDecl(Param); 803 } 804 } 805} 806 807 808/// \brief Determine whether we allow overloading of the function 809/// PrevDecl with another declaration. 810/// 811/// This routine determines whether overloading is possible, not 812/// whether some new function is actually an overload. It will return 813/// true in C++ (where we can always provide overloads) or, as an 814/// extension, in C when the previous function is already an 815/// overloaded function declaration or has the "overloadable" 816/// attribute. 817static bool AllowOverloadingOfFunction(LookupResult &Previous, 818 ASTContext &Context) { 819 if (Context.getLangOptions().CPlusPlus) 820 return true; 821 822 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 823 return true; 824 825 return (Previous.getResultKind() == LookupResult::Found 826 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 827} 828 829/// Add this decl to the scope shadowed decl chains. 830void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 831 // Move up the scope chain until we find the nearest enclosing 832 // non-transparent context. The declaration will be introduced into this 833 // scope. 834 while (S->getEntity() && 835 ((DeclContext *)S->getEntity())->isTransparentContext()) 836 S = S->getParent(); 837 838 // Add scoped declarations into their context, so that they can be 839 // found later. Declarations without a context won't be inserted 840 // into any context. 841 if (AddToContext) 842 CurContext->addDecl(D); 843 844 // Out-of-line definitions shouldn't be pushed into scope in C++. 845 // Out-of-line variable and function definitions shouldn't even in C. 846 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 847 D->isOutOfLine()) 848 return; 849 850 // Template instantiations should also not be pushed into scope. 851 if (isa<FunctionDecl>(D) && 852 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 853 return; 854 855 // If this replaces anything in the current scope, 856 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 857 IEnd = IdResolver.end(); 858 for (; I != IEnd; ++I) { 859 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 860 S->RemoveDecl(*I); 861 IdResolver.RemoveDecl(*I); 862 863 // Should only need to replace one decl. 864 break; 865 } 866 } 867 868 S->AddDecl(D); 869 870 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 871 // Implicitly-generated labels may end up getting generated in an order that 872 // isn't strictly lexical, which breaks name lookup. Be careful to insert 873 // the label at the appropriate place in the identifier chain. 874 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 875 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 876 if (IDC == CurContext) { 877 if (!S->isDeclScope(*I)) 878 continue; 879 } else if (IDC->Encloses(CurContext)) 880 break; 881 } 882 883 IdResolver.InsertDeclAfter(I, D); 884 } else { 885 IdResolver.AddDecl(D); 886 } 887} 888 889bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 890 bool ExplicitInstantiationOrSpecialization) { 891 return IdResolver.isDeclInScope(D, Ctx, Context, S, 892 ExplicitInstantiationOrSpecialization); 893} 894 895Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 896 DeclContext *TargetDC = DC->getPrimaryContext(); 897 do { 898 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 899 if (ScopeDC->getPrimaryContext() == TargetDC) 900 return S; 901 } while ((S = S->getParent())); 902 903 return 0; 904} 905 906static bool isOutOfScopePreviousDeclaration(NamedDecl *, 907 DeclContext*, 908 ASTContext&); 909 910/// Filters out lookup results that don't fall within the given scope 911/// as determined by isDeclInScope. 912void Sema::FilterLookupForScope(LookupResult &R, 913 DeclContext *Ctx, Scope *S, 914 bool ConsiderLinkage, 915 bool ExplicitInstantiationOrSpecialization) { 916 LookupResult::Filter F = R.makeFilter(); 917 while (F.hasNext()) { 918 NamedDecl *D = F.next(); 919 920 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 921 continue; 922 923 if (ConsiderLinkage && 924 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 925 continue; 926 927 F.erase(); 928 } 929 930 F.done(); 931} 932 933static bool isUsingDecl(NamedDecl *D) { 934 return isa<UsingShadowDecl>(D) || 935 isa<UnresolvedUsingTypenameDecl>(D) || 936 isa<UnresolvedUsingValueDecl>(D); 937} 938 939/// Removes using shadow declarations from the lookup results. 940static void RemoveUsingDecls(LookupResult &R) { 941 LookupResult::Filter F = R.makeFilter(); 942 while (F.hasNext()) 943 if (isUsingDecl(F.next())) 944 F.erase(); 945 946 F.done(); 947} 948 949/// \brief Check for this common pattern: 950/// @code 951/// class S { 952/// S(const S&); // DO NOT IMPLEMENT 953/// void operator=(const S&); // DO NOT IMPLEMENT 954/// }; 955/// @endcode 956static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 957 // FIXME: Should check for private access too but access is set after we get 958 // the decl here. 959 if (D->doesThisDeclarationHaveABody()) 960 return false; 961 962 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 963 return CD->isCopyConstructor(); 964 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 965 return Method->isCopyAssignmentOperator(); 966 return false; 967} 968 969bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 970 assert(D); 971 972 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 973 return false; 974 975 // Ignore class templates. 976 if (D->getDeclContext()->isDependentContext() || 977 D->getLexicalDeclContext()->isDependentContext()) 978 return false; 979 980 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 981 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 982 return false; 983 984 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 985 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 986 return false; 987 } else { 988 // 'static inline' functions are used in headers; don't warn. 989 if (FD->getStorageClass() == SC_Static && 990 FD->isInlineSpecified()) 991 return false; 992 } 993 994 if (FD->doesThisDeclarationHaveABody() && 995 Context.DeclMustBeEmitted(FD)) 996 return false; 997 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 998 if (!VD->isFileVarDecl() || 999 VD->getType().isConstant(Context) || 1000 Context.DeclMustBeEmitted(VD)) 1001 return false; 1002 1003 if (VD->isStaticDataMember() && 1004 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1005 return false; 1006 1007 } else { 1008 return false; 1009 } 1010 1011 // Only warn for unused decls internal to the translation unit. 1012 if (D->getLinkage() == ExternalLinkage) 1013 return false; 1014 1015 return true; 1016} 1017 1018void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1019 if (!D) 1020 return; 1021 1022 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1023 const FunctionDecl *First = FD->getFirstDeclaration(); 1024 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1025 return; // First should already be in the vector. 1026 } 1027 1028 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1029 const VarDecl *First = VD->getFirstDeclaration(); 1030 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1031 return; // First should already be in the vector. 1032 } 1033 1034 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1035 UnusedFileScopedDecls.push_back(D); 1036 } 1037 1038static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1039 if (D->isInvalidDecl()) 1040 return false; 1041 1042 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1043 return false; 1044 1045 if (isa<LabelDecl>(D)) 1046 return true; 1047 1048 // White-list anything that isn't a local variable. 1049 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1050 !D->getDeclContext()->isFunctionOrMethod()) 1051 return false; 1052 1053 // Types of valid local variables should be complete, so this should succeed. 1054 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1055 1056 // White-list anything with an __attribute__((unused)) type. 1057 QualType Ty = VD->getType(); 1058 1059 // Only look at the outermost level of typedef. 1060 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1061 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1062 return false; 1063 } 1064 1065 // If we failed to complete the type for some reason, or if the type is 1066 // dependent, don't diagnose the variable. 1067 if (Ty->isIncompleteType() || Ty->isDependentType()) 1068 return false; 1069 1070 if (const TagType *TT = Ty->getAs<TagType>()) { 1071 const TagDecl *Tag = TT->getDecl(); 1072 if (Tag->hasAttr<UnusedAttr>()) 1073 return false; 1074 1075 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1076 // FIXME: Checking for the presence of a user-declared constructor 1077 // isn't completely accurate; we'd prefer to check that the initializer 1078 // has no side effects. 1079 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1080 return false; 1081 } 1082 } 1083 1084 // TODO: __attribute__((unused)) templates? 1085 } 1086 1087 return true; 1088} 1089 1090static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1091 FixItHint &Hint) { 1092 if (isa<LabelDecl>(D)) { 1093 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1094 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1095 if (AfterColon.isInvalid()) 1096 return; 1097 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1098 getCharRange(D->getLocStart(), AfterColon)); 1099 } 1100 return; 1101} 1102 1103/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1104/// unless they are marked attr(unused). 1105void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1106 FixItHint Hint; 1107 if (!ShouldDiagnoseUnusedDecl(D)) 1108 return; 1109 1110 GenerateFixForUnusedDecl(D, Context, Hint); 1111 1112 unsigned DiagID; 1113 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1114 DiagID = diag::warn_unused_exception_param; 1115 else if (isa<LabelDecl>(D)) 1116 DiagID = diag::warn_unused_label; 1117 else 1118 DiagID = diag::warn_unused_variable; 1119 1120 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1121} 1122 1123static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1124 // Verify that we have no forward references left. If so, there was a goto 1125 // or address of a label taken, but no definition of it. Label fwd 1126 // definitions are indicated with a null substmt. 1127 if (L->getStmt() == 0) 1128 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1129} 1130 1131void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1132 if (S->decl_empty()) return; 1133 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1134 "Scope shouldn't contain decls!"); 1135 1136 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1137 I != E; ++I) { 1138 Decl *TmpD = (*I); 1139 assert(TmpD && "This decl didn't get pushed??"); 1140 1141 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1142 NamedDecl *D = cast<NamedDecl>(TmpD); 1143 1144 if (!D->getDeclName()) continue; 1145 1146 // Diagnose unused variables in this scope. 1147 if (!S->hasErrorOccurred()) 1148 DiagnoseUnusedDecl(D); 1149 1150 // If this was a forward reference to a label, verify it was defined. 1151 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1152 CheckPoppedLabel(LD, *this); 1153 1154 // Remove this name from our lexical scope. 1155 IdResolver.RemoveDecl(D); 1156 } 1157} 1158 1159/// \brief Look for an Objective-C class in the translation unit. 1160/// 1161/// \param Id The name of the Objective-C class we're looking for. If 1162/// typo-correction fixes this name, the Id will be updated 1163/// to the fixed name. 1164/// 1165/// \param IdLoc The location of the name in the translation unit. 1166/// 1167/// \param TypoCorrection If true, this routine will attempt typo correction 1168/// if there is no class with the given name. 1169/// 1170/// \returns The declaration of the named Objective-C class, or NULL if the 1171/// class could not be found. 1172ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1173 SourceLocation IdLoc, 1174 bool DoTypoCorrection) { 1175 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1176 // creation from this context. 1177 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1178 1179 if (!IDecl && DoTypoCorrection) { 1180 // Perform typo correction at the given location, but only if we 1181 // find an Objective-C class name. 1182 TypoCorrection C; 1183 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1184 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1185 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1186 Diag(IdLoc, diag::err_undef_interface_suggest) 1187 << Id << IDecl->getDeclName() 1188 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1189 Diag(IDecl->getLocation(), diag::note_previous_decl) 1190 << IDecl->getDeclName(); 1191 1192 Id = IDecl->getIdentifier(); 1193 } 1194 } 1195 1196 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1197} 1198 1199/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1200/// from S, where a non-field would be declared. This routine copes 1201/// with the difference between C and C++ scoping rules in structs and 1202/// unions. For example, the following code is well-formed in C but 1203/// ill-formed in C++: 1204/// @code 1205/// struct S6 { 1206/// enum { BAR } e; 1207/// }; 1208/// 1209/// void test_S6() { 1210/// struct S6 a; 1211/// a.e = BAR; 1212/// } 1213/// @endcode 1214/// For the declaration of BAR, this routine will return a different 1215/// scope. The scope S will be the scope of the unnamed enumeration 1216/// within S6. In C++, this routine will return the scope associated 1217/// with S6, because the enumeration's scope is a transparent 1218/// context but structures can contain non-field names. In C, this 1219/// routine will return the translation unit scope, since the 1220/// enumeration's scope is a transparent context and structures cannot 1221/// contain non-field names. 1222Scope *Sema::getNonFieldDeclScope(Scope *S) { 1223 while (((S->getFlags() & Scope::DeclScope) == 0) || 1224 (S->getEntity() && 1225 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1226 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1227 S = S->getParent(); 1228 return S; 1229} 1230 1231/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1232/// file scope. lazily create a decl for it. ForRedeclaration is true 1233/// if we're creating this built-in in anticipation of redeclaring the 1234/// built-in. 1235NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1236 Scope *S, bool ForRedeclaration, 1237 SourceLocation Loc) { 1238 Builtin::ID BID = (Builtin::ID)bid; 1239 1240 ASTContext::GetBuiltinTypeError Error; 1241 QualType R = Context.GetBuiltinType(BID, Error); 1242 switch (Error) { 1243 case ASTContext::GE_None: 1244 // Okay 1245 break; 1246 1247 case ASTContext::GE_Missing_stdio: 1248 if (ForRedeclaration) 1249 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1250 << Context.BuiltinInfo.GetName(BID); 1251 return 0; 1252 1253 case ASTContext::GE_Missing_setjmp: 1254 if (ForRedeclaration) 1255 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1256 << Context.BuiltinInfo.GetName(BID); 1257 return 0; 1258 } 1259 1260 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1261 Diag(Loc, diag::ext_implicit_lib_function_decl) 1262 << Context.BuiltinInfo.GetName(BID) 1263 << R; 1264 if (Context.BuiltinInfo.getHeaderName(BID) && 1265 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1266 != Diagnostic::Ignored) 1267 Diag(Loc, diag::note_please_include_header) 1268 << Context.BuiltinInfo.getHeaderName(BID) 1269 << Context.BuiltinInfo.GetName(BID); 1270 } 1271 1272 FunctionDecl *New = FunctionDecl::Create(Context, 1273 Context.getTranslationUnitDecl(), 1274 Loc, Loc, II, R, /*TInfo=*/0, 1275 SC_Extern, 1276 SC_None, false, 1277 /*hasPrototype=*/true); 1278 New->setImplicit(); 1279 1280 // Create Decl objects for each parameter, adding them to the 1281 // FunctionDecl. 1282 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1283 SmallVector<ParmVarDecl*, 16> Params; 1284 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1285 ParmVarDecl *parm = 1286 ParmVarDecl::Create(Context, New, SourceLocation(), 1287 SourceLocation(), 0, 1288 FT->getArgType(i), /*TInfo=*/0, 1289 SC_None, SC_None, 0); 1290 parm->setScopeInfo(0, i); 1291 Params.push_back(parm); 1292 } 1293 New->setParams(Params.data(), Params.size()); 1294 } 1295 1296 AddKnownFunctionAttributes(New); 1297 1298 // TUScope is the translation-unit scope to insert this function into. 1299 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1300 // relate Scopes to DeclContexts, and probably eliminate CurContext 1301 // entirely, but we're not there yet. 1302 DeclContext *SavedContext = CurContext; 1303 CurContext = Context.getTranslationUnitDecl(); 1304 PushOnScopeChains(New, TUScope); 1305 CurContext = SavedContext; 1306 return New; 1307} 1308 1309/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1310/// same name and scope as a previous declaration 'Old'. Figure out 1311/// how to resolve this situation, merging decls or emitting 1312/// diagnostics as appropriate. If there was an error, set New to be invalid. 1313/// 1314void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1315 // If the new decl is known invalid already, don't bother doing any 1316 // merging checks. 1317 if (New->isInvalidDecl()) return; 1318 1319 // Allow multiple definitions for ObjC built-in typedefs. 1320 // FIXME: Verify the underlying types are equivalent! 1321 if (getLangOptions().ObjC1) { 1322 const IdentifierInfo *TypeID = New->getIdentifier(); 1323 switch (TypeID->getLength()) { 1324 default: break; 1325 case 2: 1326 if (!TypeID->isStr("id")) 1327 break; 1328 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1329 // Install the built-in type for 'id', ignoring the current definition. 1330 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1331 return; 1332 case 5: 1333 if (!TypeID->isStr("Class")) 1334 break; 1335 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1336 // Install the built-in type for 'Class', ignoring the current definition. 1337 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1338 return; 1339 case 3: 1340 if (!TypeID->isStr("SEL")) 1341 break; 1342 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1343 // Install the built-in type for 'SEL', ignoring the current definition. 1344 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1345 return; 1346 } 1347 // Fall through - the typedef name was not a builtin type. 1348 } 1349 1350 // Verify the old decl was also a type. 1351 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1352 if (!Old) { 1353 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1354 << New->getDeclName(); 1355 1356 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1357 if (OldD->getLocation().isValid()) 1358 Diag(OldD->getLocation(), diag::note_previous_definition); 1359 1360 return New->setInvalidDecl(); 1361 } 1362 1363 // If the old declaration is invalid, just give up here. 1364 if (Old->isInvalidDecl()) 1365 return New->setInvalidDecl(); 1366 1367 // Determine the "old" type we'll use for checking and diagnostics. 1368 QualType OldType; 1369 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1370 OldType = OldTypedef->getUnderlyingType(); 1371 else 1372 OldType = Context.getTypeDeclType(Old); 1373 1374 // If the typedef types are not identical, reject them in all languages and 1375 // with any extensions enabled. 1376 1377 if (OldType != New->getUnderlyingType() && 1378 Context.getCanonicalType(OldType) != 1379 Context.getCanonicalType(New->getUnderlyingType())) { 1380 int Kind = 0; 1381 if (isa<TypeAliasDecl>(Old)) 1382 Kind = 1; 1383 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1384 << Kind << New->getUnderlyingType() << OldType; 1385 if (Old->getLocation().isValid()) 1386 Diag(Old->getLocation(), diag::note_previous_definition); 1387 return New->setInvalidDecl(); 1388 } 1389 1390 // The types match. Link up the redeclaration chain if the old 1391 // declaration was a typedef. 1392 // FIXME: this is a potential source of weirdness if the type 1393 // spellings don't match exactly. 1394 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1395 New->setPreviousDeclaration(Typedef); 1396 1397 if (getLangOptions().Microsoft) 1398 return; 1399 1400 if (getLangOptions().CPlusPlus) { 1401 // C++ [dcl.typedef]p2: 1402 // In a given non-class scope, a typedef specifier can be used to 1403 // redefine the name of any type declared in that scope to refer 1404 // to the type to which it already refers. 1405 if (!isa<CXXRecordDecl>(CurContext)) 1406 return; 1407 1408 // C++0x [dcl.typedef]p4: 1409 // In a given class scope, a typedef specifier can be used to redefine 1410 // any class-name declared in that scope that is not also a typedef-name 1411 // to refer to the type to which it already refers. 1412 // 1413 // This wording came in via DR424, which was a correction to the 1414 // wording in DR56, which accidentally banned code like: 1415 // 1416 // struct S { 1417 // typedef struct A { } A; 1418 // }; 1419 // 1420 // in the C++03 standard. We implement the C++0x semantics, which 1421 // allow the above but disallow 1422 // 1423 // struct S { 1424 // typedef int I; 1425 // typedef int I; 1426 // }; 1427 // 1428 // since that was the intent of DR56. 1429 if (!isa<TypedefNameDecl>(Old)) 1430 return; 1431 1432 Diag(New->getLocation(), diag::err_redefinition) 1433 << New->getDeclName(); 1434 Diag(Old->getLocation(), diag::note_previous_definition); 1435 return New->setInvalidDecl(); 1436 } 1437 1438 // If we have a redefinition of a typedef in C, emit a warning. This warning 1439 // is normally mapped to an error, but can be controlled with 1440 // -Wtypedef-redefinition. If either the original or the redefinition is 1441 // in a system header, don't emit this for compatibility with GCC. 1442 if (getDiagnostics().getSuppressSystemWarnings() && 1443 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1444 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1445 return; 1446 1447 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1448 << New->getDeclName(); 1449 Diag(Old->getLocation(), diag::note_previous_definition); 1450 return; 1451} 1452 1453/// DeclhasAttr - returns true if decl Declaration already has the target 1454/// attribute. 1455static bool 1456DeclHasAttr(const Decl *D, const Attr *A) { 1457 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1458 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1459 if ((*i)->getKind() == A->getKind()) { 1460 // FIXME: Don't hardcode this check 1461 if (OA && isa<OwnershipAttr>(*i)) 1462 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1463 return true; 1464 } 1465 1466 return false; 1467} 1468 1469/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1470static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1471 ASTContext &C, bool mergeDeprecation = true) { 1472 if (!oldDecl->hasAttrs()) 1473 return; 1474 1475 bool foundAny = newDecl->hasAttrs(); 1476 1477 // Ensure that any moving of objects within the allocated map is done before 1478 // we process them. 1479 if (!foundAny) newDecl->setAttrs(AttrVec()); 1480 1481 for (specific_attr_iterator<InheritableAttr> 1482 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1483 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1484 // Ignore deprecated and unavailable attributes if requested. 1485 if (!mergeDeprecation && 1486 (isa<DeprecatedAttr>(*i) || isa<UnavailableAttr>(*i))) 1487 continue; 1488 1489 if (!DeclHasAttr(newDecl, *i)) { 1490 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1491 newAttr->setInherited(true); 1492 newDecl->addAttr(newAttr); 1493 foundAny = true; 1494 } 1495 } 1496 1497 if (!foundAny) newDecl->dropAttrs(); 1498} 1499 1500/// mergeParamDeclAttributes - Copy attributes from the old parameter 1501/// to the new one. 1502static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1503 const ParmVarDecl *oldDecl, 1504 ASTContext &C) { 1505 if (!oldDecl->hasAttrs()) 1506 return; 1507 1508 bool foundAny = newDecl->hasAttrs(); 1509 1510 // Ensure that any moving of objects within the allocated map is 1511 // done before we process them. 1512 if (!foundAny) newDecl->setAttrs(AttrVec()); 1513 1514 for (specific_attr_iterator<InheritableParamAttr> 1515 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1516 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1517 if (!DeclHasAttr(newDecl, *i)) { 1518 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1519 newAttr->setInherited(true); 1520 newDecl->addAttr(newAttr); 1521 foundAny = true; 1522 } 1523 } 1524 1525 if (!foundAny) newDecl->dropAttrs(); 1526} 1527 1528namespace { 1529 1530/// Used in MergeFunctionDecl to keep track of function parameters in 1531/// C. 1532struct GNUCompatibleParamWarning { 1533 ParmVarDecl *OldParm; 1534 ParmVarDecl *NewParm; 1535 QualType PromotedType; 1536}; 1537 1538} 1539 1540/// getSpecialMember - get the special member enum for a method. 1541Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1542 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1543 if (Ctor->isDefaultConstructor()) 1544 return Sema::CXXDefaultConstructor; 1545 1546 if (Ctor->isCopyConstructor()) 1547 return Sema::CXXCopyConstructor; 1548 1549 if (Ctor->isMoveConstructor()) 1550 return Sema::CXXMoveConstructor; 1551 } else if (isa<CXXDestructorDecl>(MD)) { 1552 return Sema::CXXDestructor; 1553 } else if (MD->isCopyAssignmentOperator()) { 1554 return Sema::CXXCopyAssignment; 1555 } else if (MD->isMoveAssignmentOperator()) { 1556 return Sema::CXXMoveAssignment; 1557 } 1558 1559 return Sema::CXXInvalid; 1560} 1561 1562/// canRedefineFunction - checks if a function can be redefined. Currently, 1563/// only extern inline functions can be redefined, and even then only in 1564/// GNU89 mode. 1565static bool canRedefineFunction(const FunctionDecl *FD, 1566 const LangOptions& LangOpts) { 1567 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1568 !LangOpts.CPlusPlus && 1569 FD->isInlineSpecified() && 1570 FD->getStorageClass() == SC_Extern); 1571} 1572 1573/// MergeFunctionDecl - We just parsed a function 'New' from 1574/// declarator D which has the same name and scope as a previous 1575/// declaration 'Old'. Figure out how to resolve this situation, 1576/// merging decls or emitting diagnostics as appropriate. 1577/// 1578/// In C++, New and Old must be declarations that are not 1579/// overloaded. Use IsOverload to determine whether New and Old are 1580/// overloaded, and to select the Old declaration that New should be 1581/// merged with. 1582/// 1583/// Returns true if there was an error, false otherwise. 1584bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1585 // Verify the old decl was also a function. 1586 FunctionDecl *Old = 0; 1587 if (FunctionTemplateDecl *OldFunctionTemplate 1588 = dyn_cast<FunctionTemplateDecl>(OldD)) 1589 Old = OldFunctionTemplate->getTemplatedDecl(); 1590 else 1591 Old = dyn_cast<FunctionDecl>(OldD); 1592 if (!Old) { 1593 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1594 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1595 Diag(Shadow->getTargetDecl()->getLocation(), 1596 diag::note_using_decl_target); 1597 Diag(Shadow->getUsingDecl()->getLocation(), 1598 diag::note_using_decl) << 0; 1599 return true; 1600 } 1601 1602 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1603 << New->getDeclName(); 1604 Diag(OldD->getLocation(), diag::note_previous_definition); 1605 return true; 1606 } 1607 1608 // Determine whether the previous declaration was a definition, 1609 // implicit declaration, or a declaration. 1610 diag::kind PrevDiag; 1611 if (Old->isThisDeclarationADefinition()) 1612 PrevDiag = diag::note_previous_definition; 1613 else if (Old->isImplicit()) 1614 PrevDiag = diag::note_previous_implicit_declaration; 1615 else 1616 PrevDiag = diag::note_previous_declaration; 1617 1618 QualType OldQType = Context.getCanonicalType(Old->getType()); 1619 QualType NewQType = Context.getCanonicalType(New->getType()); 1620 1621 // Don't complain about this if we're in GNU89 mode and the old function 1622 // is an extern inline function. 1623 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1624 New->getStorageClass() == SC_Static && 1625 Old->getStorageClass() != SC_Static && 1626 !canRedefineFunction(Old, getLangOptions())) { 1627 if (getLangOptions().Microsoft) { 1628 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1629 Diag(Old->getLocation(), PrevDiag); 1630 } else { 1631 Diag(New->getLocation(), diag::err_static_non_static) << New; 1632 Diag(Old->getLocation(), PrevDiag); 1633 return true; 1634 } 1635 } 1636 1637 // If a function is first declared with a calling convention, but is 1638 // later declared or defined without one, the second decl assumes the 1639 // calling convention of the first. 1640 // 1641 // For the new decl, we have to look at the NON-canonical type to tell the 1642 // difference between a function that really doesn't have a calling 1643 // convention and one that is declared cdecl. That's because in 1644 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1645 // because it is the default calling convention. 1646 // 1647 // Note also that we DO NOT return at this point, because we still have 1648 // other tests to run. 1649 const FunctionType *OldType = cast<FunctionType>(OldQType); 1650 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1651 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1652 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1653 bool RequiresAdjustment = false; 1654 if (OldTypeInfo.getCC() != CC_Default && 1655 NewTypeInfo.getCC() == CC_Default) { 1656 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1657 RequiresAdjustment = true; 1658 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1659 NewTypeInfo.getCC())) { 1660 // Calling conventions really aren't compatible, so complain. 1661 Diag(New->getLocation(), diag::err_cconv_change) 1662 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1663 << (OldTypeInfo.getCC() == CC_Default) 1664 << (OldTypeInfo.getCC() == CC_Default ? "" : 1665 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1666 Diag(Old->getLocation(), diag::note_previous_declaration); 1667 return true; 1668 } 1669 1670 // FIXME: diagnose the other way around? 1671 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1672 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1673 RequiresAdjustment = true; 1674 } 1675 1676 // Merge regparm attribute. 1677 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1678 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1679 if (NewTypeInfo.getHasRegParm()) { 1680 Diag(New->getLocation(), diag::err_regparm_mismatch) 1681 << NewType->getRegParmType() 1682 << OldType->getRegParmType(); 1683 Diag(Old->getLocation(), diag::note_previous_declaration); 1684 return true; 1685 } 1686 1687 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1688 RequiresAdjustment = true; 1689 } 1690 1691 if (RequiresAdjustment) { 1692 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1693 New->setType(QualType(NewType, 0)); 1694 NewQType = Context.getCanonicalType(New->getType()); 1695 } 1696 1697 if (getLangOptions().CPlusPlus) { 1698 // (C++98 13.1p2): 1699 // Certain function declarations cannot be overloaded: 1700 // -- Function declarations that differ only in the return type 1701 // cannot be overloaded. 1702 QualType OldReturnType = OldType->getResultType(); 1703 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1704 QualType ResQT; 1705 if (OldReturnType != NewReturnType) { 1706 if (NewReturnType->isObjCObjectPointerType() 1707 && OldReturnType->isObjCObjectPointerType()) 1708 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1709 if (ResQT.isNull()) { 1710 if (New->isCXXClassMember() && New->isOutOfLine()) 1711 Diag(New->getLocation(), 1712 diag::err_member_def_does_not_match_ret_type) << New; 1713 else 1714 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1715 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1716 return true; 1717 } 1718 else 1719 NewQType = ResQT; 1720 } 1721 1722 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1723 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1724 if (OldMethod && NewMethod) { 1725 // Preserve triviality. 1726 NewMethod->setTrivial(OldMethod->isTrivial()); 1727 1728 // MSVC allows explicit template specialization at class scope: 1729 // 2 CXMethodDecls referring to the same function will be injected. 1730 // We don't want a redeclartion error. 1731 bool IsClassScopeExplicitSpecialization = 1732 OldMethod->isFunctionTemplateSpecialization() && 1733 NewMethod->isFunctionTemplateSpecialization(); 1734 bool isFriend = NewMethod->getFriendObjectKind(); 1735 1736 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1737 !IsClassScopeExplicitSpecialization) { 1738 // -- Member function declarations with the same name and the 1739 // same parameter types cannot be overloaded if any of them 1740 // is a static member function declaration. 1741 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1742 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1743 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1744 return true; 1745 } 1746 1747 // C++ [class.mem]p1: 1748 // [...] A member shall not be declared twice in the 1749 // member-specification, except that a nested class or member 1750 // class template can be declared and then later defined. 1751 unsigned NewDiag; 1752 if (isa<CXXConstructorDecl>(OldMethod)) 1753 NewDiag = diag::err_constructor_redeclared; 1754 else if (isa<CXXDestructorDecl>(NewMethod)) 1755 NewDiag = diag::err_destructor_redeclared; 1756 else if (isa<CXXConversionDecl>(NewMethod)) 1757 NewDiag = diag::err_conv_function_redeclared; 1758 else 1759 NewDiag = diag::err_member_redeclared; 1760 1761 Diag(New->getLocation(), NewDiag); 1762 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1763 1764 // Complain if this is an explicit declaration of a special 1765 // member that was initially declared implicitly. 1766 // 1767 // As an exception, it's okay to befriend such methods in order 1768 // to permit the implicit constructor/destructor/operator calls. 1769 } else if (OldMethod->isImplicit()) { 1770 if (isFriend) { 1771 NewMethod->setImplicit(); 1772 } else { 1773 Diag(NewMethod->getLocation(), 1774 diag::err_definition_of_implicitly_declared_member) 1775 << New << getSpecialMember(OldMethod); 1776 return true; 1777 } 1778 } else if (OldMethod->isExplicitlyDefaulted()) { 1779 Diag(NewMethod->getLocation(), 1780 diag::err_definition_of_explicitly_defaulted_member) 1781 << getSpecialMember(OldMethod); 1782 return true; 1783 } 1784 } 1785 1786 // (C++98 8.3.5p3): 1787 // All declarations for a function shall agree exactly in both the 1788 // return type and the parameter-type-list. 1789 // We also want to respect all the extended bits except noreturn. 1790 1791 // noreturn should now match unless the old type info didn't have it. 1792 QualType OldQTypeForComparison = OldQType; 1793 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1794 assert(OldQType == QualType(OldType, 0)); 1795 const FunctionType *OldTypeForComparison 1796 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1797 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1798 assert(OldQTypeForComparison.isCanonical()); 1799 } 1800 1801 if (OldQTypeForComparison == NewQType) 1802 return MergeCompatibleFunctionDecls(New, Old); 1803 1804 // Fall through for conflicting redeclarations and redefinitions. 1805 } 1806 1807 // C: Function types need to be compatible, not identical. This handles 1808 // duplicate function decls like "void f(int); void f(enum X);" properly. 1809 if (!getLangOptions().CPlusPlus && 1810 Context.typesAreCompatible(OldQType, NewQType)) { 1811 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1812 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1813 const FunctionProtoType *OldProto = 0; 1814 if (isa<FunctionNoProtoType>(NewFuncType) && 1815 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1816 // The old declaration provided a function prototype, but the 1817 // new declaration does not. Merge in the prototype. 1818 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1819 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1820 OldProto->arg_type_end()); 1821 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1822 ParamTypes.data(), ParamTypes.size(), 1823 OldProto->getExtProtoInfo()); 1824 New->setType(NewQType); 1825 New->setHasInheritedPrototype(); 1826 1827 // Synthesize a parameter for each argument type. 1828 SmallVector<ParmVarDecl*, 16> Params; 1829 for (FunctionProtoType::arg_type_iterator 1830 ParamType = OldProto->arg_type_begin(), 1831 ParamEnd = OldProto->arg_type_end(); 1832 ParamType != ParamEnd; ++ParamType) { 1833 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1834 SourceLocation(), 1835 SourceLocation(), 0, 1836 *ParamType, /*TInfo=*/0, 1837 SC_None, SC_None, 1838 0); 1839 Param->setScopeInfo(0, Params.size()); 1840 Param->setImplicit(); 1841 Params.push_back(Param); 1842 } 1843 1844 New->setParams(Params.data(), Params.size()); 1845 } 1846 1847 return MergeCompatibleFunctionDecls(New, Old); 1848 } 1849 1850 // GNU C permits a K&R definition to follow a prototype declaration 1851 // if the declared types of the parameters in the K&R definition 1852 // match the types in the prototype declaration, even when the 1853 // promoted types of the parameters from the K&R definition differ 1854 // from the types in the prototype. GCC then keeps the types from 1855 // the prototype. 1856 // 1857 // If a variadic prototype is followed by a non-variadic K&R definition, 1858 // the K&R definition becomes variadic. This is sort of an edge case, but 1859 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1860 // C99 6.9.1p8. 1861 if (!getLangOptions().CPlusPlus && 1862 Old->hasPrototype() && !New->hasPrototype() && 1863 New->getType()->getAs<FunctionProtoType>() && 1864 Old->getNumParams() == New->getNumParams()) { 1865 SmallVector<QualType, 16> ArgTypes; 1866 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1867 const FunctionProtoType *OldProto 1868 = Old->getType()->getAs<FunctionProtoType>(); 1869 const FunctionProtoType *NewProto 1870 = New->getType()->getAs<FunctionProtoType>(); 1871 1872 // Determine whether this is the GNU C extension. 1873 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1874 NewProto->getResultType()); 1875 bool LooseCompatible = !MergedReturn.isNull(); 1876 for (unsigned Idx = 0, End = Old->getNumParams(); 1877 LooseCompatible && Idx != End; ++Idx) { 1878 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1879 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1880 if (Context.typesAreCompatible(OldParm->getType(), 1881 NewProto->getArgType(Idx))) { 1882 ArgTypes.push_back(NewParm->getType()); 1883 } else if (Context.typesAreCompatible(OldParm->getType(), 1884 NewParm->getType(), 1885 /*CompareUnqualified=*/true)) { 1886 GNUCompatibleParamWarning Warn 1887 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1888 Warnings.push_back(Warn); 1889 ArgTypes.push_back(NewParm->getType()); 1890 } else 1891 LooseCompatible = false; 1892 } 1893 1894 if (LooseCompatible) { 1895 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1896 Diag(Warnings[Warn].NewParm->getLocation(), 1897 diag::ext_param_promoted_not_compatible_with_prototype) 1898 << Warnings[Warn].PromotedType 1899 << Warnings[Warn].OldParm->getType(); 1900 if (Warnings[Warn].OldParm->getLocation().isValid()) 1901 Diag(Warnings[Warn].OldParm->getLocation(), 1902 diag::note_previous_declaration); 1903 } 1904 1905 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1906 ArgTypes.size(), 1907 OldProto->getExtProtoInfo())); 1908 return MergeCompatibleFunctionDecls(New, Old); 1909 } 1910 1911 // Fall through to diagnose conflicting types. 1912 } 1913 1914 // A function that has already been declared has been redeclared or defined 1915 // with a different type- show appropriate diagnostic 1916 if (unsigned BuiltinID = Old->getBuiltinID()) { 1917 // The user has declared a builtin function with an incompatible 1918 // signature. 1919 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1920 // The function the user is redeclaring is a library-defined 1921 // function like 'malloc' or 'printf'. Warn about the 1922 // redeclaration, then pretend that we don't know about this 1923 // library built-in. 1924 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1925 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1926 << Old << Old->getType(); 1927 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1928 Old->setInvalidDecl(); 1929 return false; 1930 } 1931 1932 PrevDiag = diag::note_previous_builtin_declaration; 1933 } 1934 1935 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1936 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1937 return true; 1938} 1939 1940/// \brief Completes the merge of two function declarations that are 1941/// known to be compatible. 1942/// 1943/// This routine handles the merging of attributes and other 1944/// properties of function declarations form the old declaration to 1945/// the new declaration, once we know that New is in fact a 1946/// redeclaration of Old. 1947/// 1948/// \returns false 1949bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1950 // Merge the attributes 1951 mergeDeclAttributes(New, Old, Context); 1952 1953 // Merge the storage class. 1954 if (Old->getStorageClass() != SC_Extern && 1955 Old->getStorageClass() != SC_None) 1956 New->setStorageClass(Old->getStorageClass()); 1957 1958 // Merge "pure" flag. 1959 if (Old->isPure()) 1960 New->setPure(); 1961 1962 // Merge attributes from the parameters. These can mismatch with K&R 1963 // declarations. 1964 if (New->getNumParams() == Old->getNumParams()) 1965 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1966 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1967 Context); 1968 1969 if (getLangOptions().CPlusPlus) 1970 return MergeCXXFunctionDecl(New, Old); 1971 1972 return false; 1973} 1974 1975 1976void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1977 const ObjCMethodDecl *oldMethod) { 1978 // We don't want to merge unavailable and deprecated attributes 1979 // except from interface to implementation. 1980 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 1981 1982 // Merge the attributes. 1983 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 1984 1985 // Merge attributes from the parameters. 1986 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 1987 ni = newMethod->param_begin(), ne = newMethod->param_end(); 1988 ni != ne; ++ni, ++oi) 1989 mergeParamDeclAttributes(*ni, *oi, Context); 1990 1991 CheckObjCMethodOverride(newMethod, oldMethod, true); 1992} 1993 1994/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 1995/// scope as a previous declaration 'Old'. Figure out how to merge their types, 1996/// emitting diagnostics as appropriate. 1997/// 1998/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 1999/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2000/// check them before the initializer is attached. 2001/// 2002void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2003 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2004 return; 2005 2006 QualType MergedT; 2007 if (getLangOptions().CPlusPlus) { 2008 AutoType *AT = New->getType()->getContainedAutoType(); 2009 if (AT && !AT->isDeduced()) { 2010 // We don't know what the new type is until the initializer is attached. 2011 return; 2012 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2013 // These could still be something that needs exception specs checked. 2014 return MergeVarDeclExceptionSpecs(New, Old); 2015 } 2016 // C++ [basic.link]p10: 2017 // [...] the types specified by all declarations referring to a given 2018 // object or function shall be identical, except that declarations for an 2019 // array object can specify array types that differ by the presence or 2020 // absence of a major array bound (8.3.4). 2021 else if (Old->getType()->isIncompleteArrayType() && 2022 New->getType()->isArrayType()) { 2023 CanQual<ArrayType> OldArray 2024 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2025 CanQual<ArrayType> NewArray 2026 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2027 if (OldArray->getElementType() == NewArray->getElementType()) 2028 MergedT = New->getType(); 2029 } else if (Old->getType()->isArrayType() && 2030 New->getType()->isIncompleteArrayType()) { 2031 CanQual<ArrayType> OldArray 2032 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2033 CanQual<ArrayType> NewArray 2034 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2035 if (OldArray->getElementType() == NewArray->getElementType()) 2036 MergedT = Old->getType(); 2037 } else if (New->getType()->isObjCObjectPointerType() 2038 && Old->getType()->isObjCObjectPointerType()) { 2039 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2040 Old->getType()); 2041 } 2042 } else { 2043 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2044 } 2045 if (MergedT.isNull()) { 2046 Diag(New->getLocation(), diag::err_redefinition_different_type) 2047 << New->getDeclName(); 2048 Diag(Old->getLocation(), diag::note_previous_definition); 2049 return New->setInvalidDecl(); 2050 } 2051 New->setType(MergedT); 2052} 2053 2054/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2055/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2056/// situation, merging decls or emitting diagnostics as appropriate. 2057/// 2058/// Tentative definition rules (C99 6.9.2p2) are checked by 2059/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2060/// definitions here, since the initializer hasn't been attached. 2061/// 2062void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2063 // If the new decl is already invalid, don't do any other checking. 2064 if (New->isInvalidDecl()) 2065 return; 2066 2067 // Verify the old decl was also a variable. 2068 VarDecl *Old = 0; 2069 if (!Previous.isSingleResult() || 2070 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2071 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2072 << New->getDeclName(); 2073 Diag(Previous.getRepresentativeDecl()->getLocation(), 2074 diag::note_previous_definition); 2075 return New->setInvalidDecl(); 2076 } 2077 2078 // C++ [class.mem]p1: 2079 // A member shall not be declared twice in the member-specification [...] 2080 // 2081 // Here, we need only consider static data members. 2082 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2083 Diag(New->getLocation(), diag::err_duplicate_member) 2084 << New->getIdentifier(); 2085 Diag(Old->getLocation(), diag::note_previous_declaration); 2086 New->setInvalidDecl(); 2087 } 2088 2089 mergeDeclAttributes(New, Old, Context); 2090 // Warn if an already-declared variable is made a weak_import in a subsequent declaration 2091 if (New->getAttr<WeakImportAttr>() && 2092 Old->getStorageClass() == SC_None && 2093 !Old->getAttr<WeakImportAttr>()) { 2094 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2095 Diag(Old->getLocation(), diag::note_previous_definition); 2096 // Remove weak_import attribute on new declaration. 2097 New->dropAttr<WeakImportAttr>(); 2098 } 2099 2100 // Merge the types. 2101 MergeVarDeclTypes(New, Old); 2102 if (New->isInvalidDecl()) 2103 return; 2104 2105 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2106 if (New->getStorageClass() == SC_Static && 2107 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2108 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2109 Diag(Old->getLocation(), diag::note_previous_definition); 2110 return New->setInvalidDecl(); 2111 } 2112 // C99 6.2.2p4: 2113 // For an identifier declared with the storage-class specifier 2114 // extern in a scope in which a prior declaration of that 2115 // identifier is visible,23) if the prior declaration specifies 2116 // internal or external linkage, the linkage of the identifier at 2117 // the later declaration is the same as the linkage specified at 2118 // the prior declaration. If no prior declaration is visible, or 2119 // if the prior declaration specifies no linkage, then the 2120 // identifier has external linkage. 2121 if (New->hasExternalStorage() && Old->hasLinkage()) 2122 /* Okay */; 2123 else if (New->getStorageClass() != SC_Static && 2124 Old->getStorageClass() == SC_Static) { 2125 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2126 Diag(Old->getLocation(), diag::note_previous_definition); 2127 return New->setInvalidDecl(); 2128 } 2129 2130 // Check if extern is followed by non-extern and vice-versa. 2131 if (New->hasExternalStorage() && 2132 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2133 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2134 Diag(Old->getLocation(), diag::note_previous_definition); 2135 return New->setInvalidDecl(); 2136 } 2137 if (Old->hasExternalStorage() && 2138 !New->hasLinkage() && New->isLocalVarDecl()) { 2139 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2140 Diag(Old->getLocation(), diag::note_previous_definition); 2141 return New->setInvalidDecl(); 2142 } 2143 2144 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2145 2146 // FIXME: The test for external storage here seems wrong? We still 2147 // need to check for mismatches. 2148 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2149 // Don't complain about out-of-line definitions of static members. 2150 !(Old->getLexicalDeclContext()->isRecord() && 2151 !New->getLexicalDeclContext()->isRecord())) { 2152 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2153 Diag(Old->getLocation(), diag::note_previous_definition); 2154 return New->setInvalidDecl(); 2155 } 2156 2157 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2158 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2159 Diag(Old->getLocation(), diag::note_previous_definition); 2160 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2161 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2162 Diag(Old->getLocation(), diag::note_previous_definition); 2163 } 2164 2165 // C++ doesn't have tentative definitions, so go right ahead and check here. 2166 const VarDecl *Def; 2167 if (getLangOptions().CPlusPlus && 2168 New->isThisDeclarationADefinition() == VarDecl::Definition && 2169 (Def = Old->getDefinition())) { 2170 Diag(New->getLocation(), diag::err_redefinition) 2171 << New->getDeclName(); 2172 Diag(Def->getLocation(), diag::note_previous_definition); 2173 New->setInvalidDecl(); 2174 return; 2175 } 2176 // c99 6.2.2 P4. 2177 // For an identifier declared with the storage-class specifier extern in a 2178 // scope in which a prior declaration of that identifier is visible, if 2179 // the prior declaration specifies internal or external linkage, the linkage 2180 // of the identifier at the later declaration is the same as the linkage 2181 // specified at the prior declaration. 2182 // FIXME. revisit this code. 2183 if (New->hasExternalStorage() && 2184 Old->getLinkage() == InternalLinkage && 2185 New->getDeclContext() == Old->getDeclContext()) 2186 New->setStorageClass(Old->getStorageClass()); 2187 2188 // Keep a chain of previous declarations. 2189 New->setPreviousDeclaration(Old); 2190 2191 // Inherit access appropriately. 2192 New->setAccess(Old->getAccess()); 2193} 2194 2195/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2196/// no declarator (e.g. "struct foo;") is parsed. 2197Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2198 DeclSpec &DS) { 2199 return ParsedFreeStandingDeclSpec(S, AS, DS, 2200 MultiTemplateParamsArg(*this, 0, 0)); 2201} 2202 2203/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2204/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2205/// parameters to cope with template friend declarations. 2206Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2207 DeclSpec &DS, 2208 MultiTemplateParamsArg TemplateParams) { 2209 Decl *TagD = 0; 2210 TagDecl *Tag = 0; 2211 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2212 DS.getTypeSpecType() == DeclSpec::TST_struct || 2213 DS.getTypeSpecType() == DeclSpec::TST_union || 2214 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2215 TagD = DS.getRepAsDecl(); 2216 2217 if (!TagD) // We probably had an error 2218 return 0; 2219 2220 // Note that the above type specs guarantee that the 2221 // type rep is a Decl, whereas in many of the others 2222 // it's a Type. 2223 Tag = dyn_cast<TagDecl>(TagD); 2224 } 2225 2226 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2227 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2228 // or incomplete types shall not be restrict-qualified." 2229 if (TypeQuals & DeclSpec::TQ_restrict) 2230 Diag(DS.getRestrictSpecLoc(), 2231 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2232 << DS.getSourceRange(); 2233 } 2234 2235 if (DS.isConstexprSpecified()) { 2236 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2237 // and definitions of functions and variables. 2238 if (Tag) 2239 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2240 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2241 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2242 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2243 else 2244 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2245 // Don't emit warnings after this error. 2246 return TagD; 2247 } 2248 2249 if (DS.isFriendSpecified()) { 2250 // If we're dealing with a decl but not a TagDecl, assume that 2251 // whatever routines created it handled the friendship aspect. 2252 if (TagD && !Tag) 2253 return 0; 2254 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2255 } 2256 2257 // Track whether we warned about the fact that there aren't any 2258 // declarators. 2259 bool emittedWarning = false; 2260 2261 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2262 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2263 2264 if (!Record->getDeclName() && Record->isDefinition() && 2265 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2266 if (getLangOptions().CPlusPlus || 2267 Record->getDeclContext()->isRecord()) 2268 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2269 2270 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2271 << DS.getSourceRange(); 2272 emittedWarning = true; 2273 } 2274 } 2275 2276 // Check for Microsoft C extension: anonymous struct. 2277 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 2278 CurContext->isRecord() && 2279 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2280 // Handle 2 kinds of anonymous struct: 2281 // struct STRUCT; 2282 // and 2283 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2284 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2285 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2286 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2287 DS.getRepAsType().get()->isStructureType())) { 2288 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2289 << DS.getSourceRange(); 2290 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2291 } 2292 } 2293 2294 if (getLangOptions().CPlusPlus && 2295 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2296 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2297 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2298 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2299 Diag(Enum->getLocation(), diag::ext_no_declarators) 2300 << DS.getSourceRange(); 2301 emittedWarning = true; 2302 } 2303 2304 // Skip all the checks below if we have a type error. 2305 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2306 2307 if (!DS.isMissingDeclaratorOk()) { 2308 // Warn about typedefs of enums without names, since this is an 2309 // extension in both Microsoft and GNU. 2310 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2311 Tag && isa<EnumDecl>(Tag)) { 2312 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2313 << DS.getSourceRange(); 2314 return Tag; 2315 } 2316 2317 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2318 << DS.getSourceRange(); 2319 emittedWarning = true; 2320 } 2321 2322 // We're going to complain about a bunch of spurious specifiers; 2323 // only do this if we're declaring a tag, because otherwise we 2324 // should be getting diag::ext_no_declarators. 2325 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2326 return TagD; 2327 2328 // Note that a linkage-specification sets a storage class, but 2329 // 'extern "C" struct foo;' is actually valid and not theoretically 2330 // useless. 2331 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2332 if (!DS.isExternInLinkageSpec()) 2333 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2334 << DeclSpec::getSpecifierName(scs); 2335 2336 if (DS.isThreadSpecified()) 2337 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2338 if (DS.getTypeQualifiers()) { 2339 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2340 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2341 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2342 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2343 // Restrict is covered above. 2344 } 2345 if (DS.isInlineSpecified()) 2346 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2347 if (DS.isVirtualSpecified()) 2348 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2349 if (DS.isExplicitSpecified()) 2350 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2351 2352 // FIXME: Warn on useless attributes 2353 2354 return TagD; 2355} 2356 2357/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2358/// builds a statement for it and returns it so it is evaluated. 2359StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2360 StmtResult R; 2361 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2362 Expr *Exp = DS.getRepAsExpr(); 2363 QualType Ty = Exp->getType(); 2364 if (Ty->isPointerType()) { 2365 do 2366 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2367 while (Ty->isPointerType()); 2368 } 2369 if (Ty->isVariableArrayType()) { 2370 R = ActOnExprStmt(MakeFullExpr(Exp)); 2371 } 2372 } 2373 return R; 2374} 2375 2376/// We are trying to inject an anonymous member into the given scope; 2377/// check if there's an existing declaration that can't be overloaded. 2378/// 2379/// \return true if this is a forbidden redeclaration 2380static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2381 Scope *S, 2382 DeclContext *Owner, 2383 DeclarationName Name, 2384 SourceLocation NameLoc, 2385 unsigned diagnostic) { 2386 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2387 Sema::ForRedeclaration); 2388 if (!SemaRef.LookupName(R, S)) return false; 2389 2390 if (R.getAsSingle<TagDecl>()) 2391 return false; 2392 2393 // Pick a representative declaration. 2394 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2395 assert(PrevDecl && "Expected a non-null Decl"); 2396 2397 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2398 return false; 2399 2400 SemaRef.Diag(NameLoc, diagnostic) << Name; 2401 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2402 2403 return true; 2404} 2405 2406/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2407/// anonymous struct or union AnonRecord into the owning context Owner 2408/// and scope S. This routine will be invoked just after we realize 2409/// that an unnamed union or struct is actually an anonymous union or 2410/// struct, e.g., 2411/// 2412/// @code 2413/// union { 2414/// int i; 2415/// float f; 2416/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2417/// // f into the surrounding scope.x 2418/// @endcode 2419/// 2420/// This routine is recursive, injecting the names of nested anonymous 2421/// structs/unions into the owning context and scope as well. 2422static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2423 DeclContext *Owner, 2424 RecordDecl *AnonRecord, 2425 AccessSpecifier AS, 2426 SmallVector<NamedDecl*, 2> &Chaining, 2427 bool MSAnonStruct) { 2428 unsigned diagKind 2429 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2430 : diag::err_anonymous_struct_member_redecl; 2431 2432 bool Invalid = false; 2433 2434 // Look every FieldDecl and IndirectFieldDecl with a name. 2435 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2436 DEnd = AnonRecord->decls_end(); 2437 D != DEnd; ++D) { 2438 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2439 cast<NamedDecl>(*D)->getDeclName()) { 2440 ValueDecl *VD = cast<ValueDecl>(*D); 2441 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2442 VD->getLocation(), diagKind)) { 2443 // C++ [class.union]p2: 2444 // The names of the members of an anonymous union shall be 2445 // distinct from the names of any other entity in the 2446 // scope in which the anonymous union is declared. 2447 Invalid = true; 2448 } else { 2449 // C++ [class.union]p2: 2450 // For the purpose of name lookup, after the anonymous union 2451 // definition, the members of the anonymous union are 2452 // considered to have been defined in the scope in which the 2453 // anonymous union is declared. 2454 unsigned OldChainingSize = Chaining.size(); 2455 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2456 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2457 PE = IF->chain_end(); PI != PE; ++PI) 2458 Chaining.push_back(*PI); 2459 else 2460 Chaining.push_back(VD); 2461 2462 assert(Chaining.size() >= 2); 2463 NamedDecl **NamedChain = 2464 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2465 for (unsigned i = 0; i < Chaining.size(); i++) 2466 NamedChain[i] = Chaining[i]; 2467 2468 IndirectFieldDecl* IndirectField = 2469 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2470 VD->getIdentifier(), VD->getType(), 2471 NamedChain, Chaining.size()); 2472 2473 IndirectField->setAccess(AS); 2474 IndirectField->setImplicit(); 2475 SemaRef.PushOnScopeChains(IndirectField, S); 2476 2477 // That includes picking up the appropriate access specifier. 2478 if (AS != AS_none) IndirectField->setAccess(AS); 2479 2480 Chaining.resize(OldChainingSize); 2481 } 2482 } 2483 } 2484 2485 return Invalid; 2486} 2487 2488/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2489/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2490/// illegal input values are mapped to SC_None. 2491static StorageClass 2492StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2493 switch (StorageClassSpec) { 2494 case DeclSpec::SCS_unspecified: return SC_None; 2495 case DeclSpec::SCS_extern: return SC_Extern; 2496 case DeclSpec::SCS_static: return SC_Static; 2497 case DeclSpec::SCS_auto: return SC_Auto; 2498 case DeclSpec::SCS_register: return SC_Register; 2499 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2500 // Illegal SCSs map to None: error reporting is up to the caller. 2501 case DeclSpec::SCS_mutable: // Fall through. 2502 case DeclSpec::SCS_typedef: return SC_None; 2503 } 2504 llvm_unreachable("unknown storage class specifier"); 2505} 2506 2507/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2508/// a StorageClass. Any error reporting is up to the caller: 2509/// illegal input values are mapped to SC_None. 2510static StorageClass 2511StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2512 switch (StorageClassSpec) { 2513 case DeclSpec::SCS_unspecified: return SC_None; 2514 case DeclSpec::SCS_extern: return SC_Extern; 2515 case DeclSpec::SCS_static: return SC_Static; 2516 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2517 // Illegal SCSs map to None: error reporting is up to the caller. 2518 case DeclSpec::SCS_auto: // Fall through. 2519 case DeclSpec::SCS_mutable: // Fall through. 2520 case DeclSpec::SCS_register: // Fall through. 2521 case DeclSpec::SCS_typedef: return SC_None; 2522 } 2523 llvm_unreachable("unknown storage class specifier"); 2524} 2525 2526/// BuildAnonymousStructOrUnion - Handle the declaration of an 2527/// anonymous structure or union. Anonymous unions are a C++ feature 2528/// (C++ [class.union]) and a GNU C extension; anonymous structures 2529/// are a GNU C and GNU C++ extension. 2530Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2531 AccessSpecifier AS, 2532 RecordDecl *Record) { 2533 DeclContext *Owner = Record->getDeclContext(); 2534 2535 // Diagnose whether this anonymous struct/union is an extension. 2536 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2537 Diag(Record->getLocation(), diag::ext_anonymous_union); 2538 else if (!Record->isUnion()) 2539 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2540 2541 // C and C++ require different kinds of checks for anonymous 2542 // structs/unions. 2543 bool Invalid = false; 2544 if (getLangOptions().CPlusPlus) { 2545 const char* PrevSpec = 0; 2546 unsigned DiagID; 2547 // C++ [class.union]p3: 2548 // Anonymous unions declared in a named namespace or in the 2549 // global namespace shall be declared static. 2550 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2551 (isa<TranslationUnitDecl>(Owner) || 2552 (isa<NamespaceDecl>(Owner) && 2553 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2554 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2555 Invalid = true; 2556 2557 // Recover by adding 'static'. 2558 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2559 PrevSpec, DiagID, getLangOptions()); 2560 } 2561 // C++ [class.union]p3: 2562 // A storage class is not allowed in a declaration of an 2563 // anonymous union in a class scope. 2564 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2565 isa<RecordDecl>(Owner)) { 2566 Diag(DS.getStorageClassSpecLoc(), 2567 diag::err_anonymous_union_with_storage_spec); 2568 Invalid = true; 2569 2570 // Recover by removing the storage specifier. 2571 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2572 PrevSpec, DiagID, getLangOptions()); 2573 } 2574 2575 // Ignore const/volatile/restrict qualifiers. 2576 if (DS.getTypeQualifiers()) { 2577 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2578 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2579 << Record->isUnion() << 0 2580 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2581 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2582 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2583 << Record->isUnion() << 1 2584 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2585 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2586 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2587 << Record->isUnion() << 2 2588 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2589 2590 DS.ClearTypeQualifiers(); 2591 } 2592 2593 // C++ [class.union]p2: 2594 // The member-specification of an anonymous union shall only 2595 // define non-static data members. [Note: nested types and 2596 // functions cannot be declared within an anonymous union. ] 2597 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2598 MemEnd = Record->decls_end(); 2599 Mem != MemEnd; ++Mem) { 2600 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2601 // C++ [class.union]p3: 2602 // An anonymous union shall not have private or protected 2603 // members (clause 11). 2604 assert(FD->getAccess() != AS_none); 2605 if (FD->getAccess() != AS_public) { 2606 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2607 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2608 Invalid = true; 2609 } 2610 2611 // C++ [class.union]p1 2612 // An object of a class with a non-trivial constructor, a non-trivial 2613 // copy constructor, a non-trivial destructor, or a non-trivial copy 2614 // assignment operator cannot be a member of a union, nor can an 2615 // array of such objects. 2616 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2617 Invalid = true; 2618 } else if ((*Mem)->isImplicit()) { 2619 // Any implicit members are fine. 2620 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2621 // This is a type that showed up in an 2622 // elaborated-type-specifier inside the anonymous struct or 2623 // union, but which actually declares a type outside of the 2624 // anonymous struct or union. It's okay. 2625 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2626 if (!MemRecord->isAnonymousStructOrUnion() && 2627 MemRecord->getDeclName()) { 2628 // Visual C++ allows type definition in anonymous struct or union. 2629 if (getLangOptions().Microsoft) 2630 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2631 << (int)Record->isUnion(); 2632 else { 2633 // This is a nested type declaration. 2634 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2635 << (int)Record->isUnion(); 2636 Invalid = true; 2637 } 2638 } 2639 } else if (isa<AccessSpecDecl>(*Mem)) { 2640 // Any access specifier is fine. 2641 } else { 2642 // We have something that isn't a non-static data 2643 // member. Complain about it. 2644 unsigned DK = diag::err_anonymous_record_bad_member; 2645 if (isa<TypeDecl>(*Mem)) 2646 DK = diag::err_anonymous_record_with_type; 2647 else if (isa<FunctionDecl>(*Mem)) 2648 DK = diag::err_anonymous_record_with_function; 2649 else if (isa<VarDecl>(*Mem)) 2650 DK = diag::err_anonymous_record_with_static; 2651 2652 // Visual C++ allows type definition in anonymous struct or union. 2653 if (getLangOptions().Microsoft && 2654 DK == diag::err_anonymous_record_with_type) 2655 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2656 << (int)Record->isUnion(); 2657 else { 2658 Diag((*Mem)->getLocation(), DK) 2659 << (int)Record->isUnion(); 2660 Invalid = true; 2661 } 2662 } 2663 } 2664 } 2665 2666 if (!Record->isUnion() && !Owner->isRecord()) { 2667 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2668 << (int)getLangOptions().CPlusPlus; 2669 Invalid = true; 2670 } 2671 2672 // Mock up a declarator. 2673 Declarator Dc(DS, Declarator::MemberContext); 2674 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2675 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2676 2677 // Create a declaration for this anonymous struct/union. 2678 NamedDecl *Anon = 0; 2679 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2680 Anon = FieldDecl::Create(Context, OwningClass, 2681 DS.getSourceRange().getBegin(), 2682 Record->getLocation(), 2683 /*IdentifierInfo=*/0, 2684 Context.getTypeDeclType(Record), 2685 TInfo, 2686 /*BitWidth=*/0, /*Mutable=*/false, 2687 /*HasInit=*/false); 2688 Anon->setAccess(AS); 2689 if (getLangOptions().CPlusPlus) 2690 FieldCollector->Add(cast<FieldDecl>(Anon)); 2691 } else { 2692 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2693 assert(SCSpec != DeclSpec::SCS_typedef && 2694 "Parser allowed 'typedef' as storage class VarDecl."); 2695 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2696 if (SCSpec == DeclSpec::SCS_mutable) { 2697 // mutable can only appear on non-static class members, so it's always 2698 // an error here 2699 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2700 Invalid = true; 2701 SC = SC_None; 2702 } 2703 SCSpec = DS.getStorageClassSpecAsWritten(); 2704 VarDecl::StorageClass SCAsWritten 2705 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2706 2707 Anon = VarDecl::Create(Context, Owner, 2708 DS.getSourceRange().getBegin(), 2709 Record->getLocation(), /*IdentifierInfo=*/0, 2710 Context.getTypeDeclType(Record), 2711 TInfo, SC, SCAsWritten); 2712 } 2713 Anon->setImplicit(); 2714 2715 // Add the anonymous struct/union object to the current 2716 // context. We'll be referencing this object when we refer to one of 2717 // its members. 2718 Owner->addDecl(Anon); 2719 2720 // Inject the members of the anonymous struct/union into the owning 2721 // context and into the identifier resolver chain for name lookup 2722 // purposes. 2723 SmallVector<NamedDecl*, 2> Chain; 2724 Chain.push_back(Anon); 2725 2726 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2727 Chain, false)) 2728 Invalid = true; 2729 2730 // Mark this as an anonymous struct/union type. Note that we do not 2731 // do this until after we have already checked and injected the 2732 // members of this anonymous struct/union type, because otherwise 2733 // the members could be injected twice: once by DeclContext when it 2734 // builds its lookup table, and once by 2735 // InjectAnonymousStructOrUnionMembers. 2736 Record->setAnonymousStructOrUnion(true); 2737 2738 if (Invalid) 2739 Anon->setInvalidDecl(); 2740 2741 return Anon; 2742} 2743 2744/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2745/// Microsoft C anonymous structure. 2746/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2747/// Example: 2748/// 2749/// struct A { int a; }; 2750/// struct B { struct A; int b; }; 2751/// 2752/// void foo() { 2753/// B var; 2754/// var.a = 3; 2755/// } 2756/// 2757Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2758 RecordDecl *Record) { 2759 2760 // If there is no Record, get the record via the typedef. 2761 if (!Record) 2762 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2763 2764 // Mock up a declarator. 2765 Declarator Dc(DS, Declarator::TypeNameContext); 2766 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2767 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2768 2769 // Create a declaration for this anonymous struct. 2770 NamedDecl* Anon = FieldDecl::Create(Context, 2771 cast<RecordDecl>(CurContext), 2772 DS.getSourceRange().getBegin(), 2773 DS.getSourceRange().getBegin(), 2774 /*IdentifierInfo=*/0, 2775 Context.getTypeDeclType(Record), 2776 TInfo, 2777 /*BitWidth=*/0, /*Mutable=*/false, 2778 /*HasInit=*/false); 2779 Anon->setImplicit(); 2780 2781 // Add the anonymous struct object to the current context. 2782 CurContext->addDecl(Anon); 2783 2784 // Inject the members of the anonymous struct into the current 2785 // context and into the identifier resolver chain for name lookup 2786 // purposes. 2787 SmallVector<NamedDecl*, 2> Chain; 2788 Chain.push_back(Anon); 2789 2790 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2791 Record->getDefinition(), 2792 AS_none, Chain, true)) 2793 Anon->setInvalidDecl(); 2794 2795 return Anon; 2796} 2797 2798/// GetNameForDeclarator - Determine the full declaration name for the 2799/// given Declarator. 2800DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2801 return GetNameFromUnqualifiedId(D.getName()); 2802} 2803 2804/// \brief Retrieves the declaration name from a parsed unqualified-id. 2805DeclarationNameInfo 2806Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2807 DeclarationNameInfo NameInfo; 2808 NameInfo.setLoc(Name.StartLocation); 2809 2810 switch (Name.getKind()) { 2811 2812 case UnqualifiedId::IK_ImplicitSelfParam: 2813 case UnqualifiedId::IK_Identifier: 2814 NameInfo.setName(Name.Identifier); 2815 NameInfo.setLoc(Name.StartLocation); 2816 return NameInfo; 2817 2818 case UnqualifiedId::IK_OperatorFunctionId: 2819 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2820 Name.OperatorFunctionId.Operator)); 2821 NameInfo.setLoc(Name.StartLocation); 2822 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2823 = Name.OperatorFunctionId.SymbolLocations[0]; 2824 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2825 = Name.EndLocation.getRawEncoding(); 2826 return NameInfo; 2827 2828 case UnqualifiedId::IK_LiteralOperatorId: 2829 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2830 Name.Identifier)); 2831 NameInfo.setLoc(Name.StartLocation); 2832 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2833 return NameInfo; 2834 2835 case UnqualifiedId::IK_ConversionFunctionId: { 2836 TypeSourceInfo *TInfo; 2837 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2838 if (Ty.isNull()) 2839 return DeclarationNameInfo(); 2840 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2841 Context.getCanonicalType(Ty))); 2842 NameInfo.setLoc(Name.StartLocation); 2843 NameInfo.setNamedTypeInfo(TInfo); 2844 return NameInfo; 2845 } 2846 2847 case UnqualifiedId::IK_ConstructorName: { 2848 TypeSourceInfo *TInfo; 2849 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2850 if (Ty.isNull()) 2851 return DeclarationNameInfo(); 2852 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2853 Context.getCanonicalType(Ty))); 2854 NameInfo.setLoc(Name.StartLocation); 2855 NameInfo.setNamedTypeInfo(TInfo); 2856 return NameInfo; 2857 } 2858 2859 case UnqualifiedId::IK_ConstructorTemplateId: { 2860 // In well-formed code, we can only have a constructor 2861 // template-id that refers to the current context, so go there 2862 // to find the actual type being constructed. 2863 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2864 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2865 return DeclarationNameInfo(); 2866 2867 // Determine the type of the class being constructed. 2868 QualType CurClassType = Context.getTypeDeclType(CurClass); 2869 2870 // FIXME: Check two things: that the template-id names the same type as 2871 // CurClassType, and that the template-id does not occur when the name 2872 // was qualified. 2873 2874 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2875 Context.getCanonicalType(CurClassType))); 2876 NameInfo.setLoc(Name.StartLocation); 2877 // FIXME: should we retrieve TypeSourceInfo? 2878 NameInfo.setNamedTypeInfo(0); 2879 return NameInfo; 2880 } 2881 2882 case UnqualifiedId::IK_DestructorName: { 2883 TypeSourceInfo *TInfo; 2884 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2885 if (Ty.isNull()) 2886 return DeclarationNameInfo(); 2887 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2888 Context.getCanonicalType(Ty))); 2889 NameInfo.setLoc(Name.StartLocation); 2890 NameInfo.setNamedTypeInfo(TInfo); 2891 return NameInfo; 2892 } 2893 2894 case UnqualifiedId::IK_TemplateId: { 2895 TemplateName TName = Name.TemplateId->Template.get(); 2896 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2897 return Context.getNameForTemplate(TName, TNameLoc); 2898 } 2899 2900 } // switch (Name.getKind()) 2901 2902 assert(false && "Unknown name kind"); 2903 return DeclarationNameInfo(); 2904} 2905 2906static QualType getCoreType(QualType Ty) { 2907 do { 2908 if (Ty->isPointerType() || Ty->isReferenceType()) 2909 Ty = Ty->getPointeeType(); 2910 else if (Ty->isArrayType()) 2911 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 2912 else 2913 return Ty.withoutLocalFastQualifiers(); 2914 } while (true); 2915} 2916 2917/// isNearlyMatchingFunction - Determine whether the C++ functions 2918/// Declaration and Definition are "nearly" matching. This heuristic 2919/// is used to improve diagnostics in the case where an out-of-line 2920/// function definition doesn't match any declaration within the class 2921/// or namespace. Also sets Params to the list of indices to the 2922/// parameters that differ between the declaration and the definition. 2923static bool isNearlyMatchingFunction(ASTContext &Context, 2924 FunctionDecl *Declaration, 2925 FunctionDecl *Definition, 2926 llvm::SmallVectorImpl<unsigned> &Params) { 2927 Params.clear(); 2928 if (Declaration->param_size() != Definition->param_size()) 2929 return false; 2930 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2931 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2932 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2933 2934 // The parameter types are identical 2935 if (Context.hasSameType(DefParamTy, DeclParamTy)) 2936 continue; 2937 2938 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 2939 QualType DefParamBaseTy = getCoreType(DefParamTy); 2940 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 2941 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 2942 2943 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 2944 (DeclTyName && DeclTyName == DefTyName)) 2945 Params.push_back(Idx); 2946 else // The two parameters aren't even close 2947 return false; 2948 } 2949 2950 return true; 2951} 2952 2953/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2954/// declarator needs to be rebuilt in the current instantiation. 2955/// Any bits of declarator which appear before the name are valid for 2956/// consideration here. That's specifically the type in the decl spec 2957/// and the base type in any member-pointer chunks. 2958static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2959 DeclarationName Name) { 2960 // The types we specifically need to rebuild are: 2961 // - typenames, typeofs, and decltypes 2962 // - types which will become injected class names 2963 // Of course, we also need to rebuild any type referencing such a 2964 // type. It's safest to just say "dependent", but we call out a 2965 // few cases here. 2966 2967 DeclSpec &DS = D.getMutableDeclSpec(); 2968 switch (DS.getTypeSpecType()) { 2969 case DeclSpec::TST_typename: 2970 case DeclSpec::TST_typeofType: 2971 case DeclSpec::TST_decltype: 2972 case DeclSpec::TST_underlyingType: { 2973 // Grab the type from the parser. 2974 TypeSourceInfo *TSI = 0; 2975 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2976 if (T.isNull() || !T->isDependentType()) break; 2977 2978 // Make sure there's a type source info. This isn't really much 2979 // of a waste; most dependent types should have type source info 2980 // attached already. 2981 if (!TSI) 2982 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2983 2984 // Rebuild the type in the current instantiation. 2985 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2986 if (!TSI) return true; 2987 2988 // Store the new type back in the decl spec. 2989 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2990 DS.UpdateTypeRep(LocType); 2991 break; 2992 } 2993 2994 case DeclSpec::TST_typeofExpr: { 2995 Expr *E = DS.getRepAsExpr(); 2996 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2997 if (Result.isInvalid()) return true; 2998 DS.UpdateExprRep(Result.get()); 2999 break; 3000 } 3001 3002 default: 3003 // Nothing to do for these decl specs. 3004 break; 3005 } 3006 3007 // It doesn't matter what order we do this in. 3008 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3009 DeclaratorChunk &Chunk = D.getTypeObject(I); 3010 3011 // The only type information in the declarator which can come 3012 // before the declaration name is the base type of a member 3013 // pointer. 3014 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3015 continue; 3016 3017 // Rebuild the scope specifier in-place. 3018 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3019 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3020 return true; 3021 } 3022 3023 return false; 3024} 3025 3026Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3027 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 3028 /*IsFunctionDefinition=*/false); 3029} 3030 3031/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3032/// If T is the name of a class, then each of the following shall have a 3033/// name different from T: 3034/// - every static data member of class T; 3035/// - every member function of class T 3036/// - every member of class T that is itself a type; 3037/// \returns true if the declaration name violates these rules. 3038bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3039 DeclarationNameInfo NameInfo) { 3040 DeclarationName Name = NameInfo.getName(); 3041 3042 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3043 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3044 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3045 return true; 3046 } 3047 3048 return false; 3049} 3050 3051Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3052 MultiTemplateParamsArg TemplateParamLists, 3053 bool IsFunctionDefinition) { 3054 // TODO: consider using NameInfo for diagnostic. 3055 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3056 DeclarationName Name = NameInfo.getName(); 3057 3058 // All of these full declarators require an identifier. If it doesn't have 3059 // one, the ParsedFreeStandingDeclSpec action should be used. 3060 if (!Name) { 3061 if (!D.isInvalidType()) // Reject this if we think it is valid. 3062 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3063 diag::err_declarator_need_ident) 3064 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3065 return 0; 3066 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3067 return 0; 3068 3069 // The scope passed in may not be a decl scope. Zip up the scope tree until 3070 // we find one that is. 3071 while ((S->getFlags() & Scope::DeclScope) == 0 || 3072 (S->getFlags() & Scope::TemplateParamScope) != 0) 3073 S = S->getParent(); 3074 3075 DeclContext *DC = CurContext; 3076 if (D.getCXXScopeSpec().isInvalid()) 3077 D.setInvalidType(); 3078 else if (D.getCXXScopeSpec().isSet()) { 3079 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3080 UPPC_DeclarationQualifier)) 3081 return 0; 3082 3083 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3084 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3085 if (!DC) { 3086 // If we could not compute the declaration context, it's because the 3087 // declaration context is dependent but does not refer to a class, 3088 // class template, or class template partial specialization. Complain 3089 // and return early, to avoid the coming semantic disaster. 3090 Diag(D.getIdentifierLoc(), 3091 diag::err_template_qualified_declarator_no_match) 3092 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3093 << D.getCXXScopeSpec().getRange(); 3094 return 0; 3095 } 3096 bool IsDependentContext = DC->isDependentContext(); 3097 3098 if (!IsDependentContext && 3099 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3100 return 0; 3101 3102 if (isa<CXXRecordDecl>(DC)) { 3103 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3104 Diag(D.getIdentifierLoc(), 3105 diag::err_member_def_undefined_record) 3106 << Name << DC << D.getCXXScopeSpec().getRange(); 3107 D.setInvalidType(); 3108 } else if (isa<CXXRecordDecl>(CurContext) && 3109 !D.getDeclSpec().isFriendSpecified()) { 3110 // The user provided a superfluous scope specifier inside a class 3111 // definition: 3112 // 3113 // class X { 3114 // void X::f(); 3115 // }; 3116 if (CurContext->Equals(DC)) 3117 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3118 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3119 else 3120 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3121 << Name << D.getCXXScopeSpec().getRange(); 3122 3123 // Pretend that this qualifier was not here. 3124 D.getCXXScopeSpec().clear(); 3125 } 3126 } 3127 3128 // Check whether we need to rebuild the type of the given 3129 // declaration in the current instantiation. 3130 if (EnteringContext && IsDependentContext && 3131 TemplateParamLists.size() != 0) { 3132 ContextRAII SavedContext(*this, DC); 3133 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3134 D.setInvalidType(); 3135 } 3136 } 3137 3138 if (DiagnoseClassNameShadow(DC, NameInfo)) 3139 // If this is a typedef, we'll end up spewing multiple diagnostics. 3140 // Just return early; it's safer. 3141 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3142 return 0; 3143 3144 NamedDecl *New; 3145 3146 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3147 QualType R = TInfo->getType(); 3148 3149 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3150 UPPC_DeclarationType)) 3151 D.setInvalidType(); 3152 3153 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3154 ForRedeclaration); 3155 3156 // See if this is a redefinition of a variable in the same scope. 3157 if (!D.getCXXScopeSpec().isSet()) { 3158 bool IsLinkageLookup = false; 3159 3160 // If the declaration we're planning to build will be a function 3161 // or object with linkage, then look for another declaration with 3162 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3163 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3164 /* Do nothing*/; 3165 else if (R->isFunctionType()) { 3166 if (CurContext->isFunctionOrMethod() || 3167 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3168 IsLinkageLookup = true; 3169 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3170 IsLinkageLookup = true; 3171 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3172 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3173 IsLinkageLookup = true; 3174 3175 if (IsLinkageLookup) 3176 Previous.clear(LookupRedeclarationWithLinkage); 3177 3178 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3179 } else { // Something like "int foo::x;" 3180 LookupQualifiedName(Previous, DC); 3181 3182 // Don't consider using declarations as previous declarations for 3183 // out-of-line members. 3184 RemoveUsingDecls(Previous); 3185 3186 // C++ 7.3.1.2p2: 3187 // Members (including explicit specializations of templates) of a named 3188 // namespace can also be defined outside that namespace by explicit 3189 // qualification of the name being defined, provided that the entity being 3190 // defined was already declared in the namespace and the definition appears 3191 // after the point of declaration in a namespace that encloses the 3192 // declarations namespace. 3193 // 3194 // Note that we only check the context at this point. We don't yet 3195 // have enough information to make sure that PrevDecl is actually 3196 // the declaration we want to match. For example, given: 3197 // 3198 // class X { 3199 // void f(); 3200 // void f(float); 3201 // }; 3202 // 3203 // void X::f(int) { } // ill-formed 3204 // 3205 // In this case, PrevDecl will point to the overload set 3206 // containing the two f's declared in X, but neither of them 3207 // matches. 3208 3209 // First check whether we named the global scope. 3210 if (isa<TranslationUnitDecl>(DC)) { 3211 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3212 << Name << D.getCXXScopeSpec().getRange(); 3213 } else { 3214 DeclContext *Cur = CurContext; 3215 while (isa<LinkageSpecDecl>(Cur)) 3216 Cur = Cur->getParent(); 3217 if (!Cur->Encloses(DC)) { 3218 // The qualifying scope doesn't enclose the original declaration. 3219 // Emit diagnostic based on current scope. 3220 SourceLocation L = D.getIdentifierLoc(); 3221 SourceRange R = D.getCXXScopeSpec().getRange(); 3222 if (isa<FunctionDecl>(Cur)) 3223 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3224 else 3225 Diag(L, diag::err_invalid_declarator_scope) 3226 << Name << cast<NamedDecl>(DC) << R; 3227 D.setInvalidType(); 3228 } 3229 } 3230 } 3231 3232 if (Previous.isSingleResult() && 3233 Previous.getFoundDecl()->isTemplateParameter()) { 3234 // Maybe we will complain about the shadowed template parameter. 3235 if (!D.isInvalidType()) 3236 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3237 Previous.getFoundDecl())) 3238 D.setInvalidType(); 3239 3240 // Just pretend that we didn't see the previous declaration. 3241 Previous.clear(); 3242 } 3243 3244 // In C++, the previous declaration we find might be a tag type 3245 // (class or enum). In this case, the new declaration will hide the 3246 // tag type. Note that this does does not apply if we're declaring a 3247 // typedef (C++ [dcl.typedef]p4). 3248 if (Previous.isSingleTagDecl() && 3249 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3250 Previous.clear(); 3251 3252 bool Redeclaration = false; 3253 bool AddToScope = true; 3254 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3255 if (TemplateParamLists.size()) { 3256 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3257 return 0; 3258 } 3259 3260 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3261 } else if (R->isFunctionType()) { 3262 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3263 move(TemplateParamLists), 3264 IsFunctionDefinition, Redeclaration, 3265 AddToScope); 3266 } else { 3267 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3268 move(TemplateParamLists), 3269 Redeclaration); 3270 } 3271 3272 if (New == 0) 3273 return 0; 3274 3275 // If this has an identifier and is not an invalid redeclaration or 3276 // function template specialization, add it to the scope stack. 3277 if (New->getDeclName() && AddToScope && 3278 !(Redeclaration && New->isInvalidDecl())) 3279 PushOnScopeChains(New, S); 3280 3281 return New; 3282} 3283 3284/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3285/// types into constant array types in certain situations which would otherwise 3286/// be errors (for GCC compatibility). 3287static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3288 ASTContext &Context, 3289 bool &SizeIsNegative, 3290 llvm::APSInt &Oversized) { 3291 // This method tries to turn a variable array into a constant 3292 // array even when the size isn't an ICE. This is necessary 3293 // for compatibility with code that depends on gcc's buggy 3294 // constant expression folding, like struct {char x[(int)(char*)2];} 3295 SizeIsNegative = false; 3296 Oversized = 0; 3297 3298 if (T->isDependentType()) 3299 return QualType(); 3300 3301 QualifierCollector Qs; 3302 const Type *Ty = Qs.strip(T); 3303 3304 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3305 QualType Pointee = PTy->getPointeeType(); 3306 QualType FixedType = 3307 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3308 Oversized); 3309 if (FixedType.isNull()) return FixedType; 3310 FixedType = Context.getPointerType(FixedType); 3311 return Qs.apply(Context, FixedType); 3312 } 3313 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3314 QualType Inner = PTy->getInnerType(); 3315 QualType FixedType = 3316 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3317 Oversized); 3318 if (FixedType.isNull()) return FixedType; 3319 FixedType = Context.getParenType(FixedType); 3320 return Qs.apply(Context, FixedType); 3321 } 3322 3323 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3324 if (!VLATy) 3325 return QualType(); 3326 // FIXME: We should probably handle this case 3327 if (VLATy->getElementType()->isVariablyModifiedType()) 3328 return QualType(); 3329 3330 Expr::EvalResult EvalResult; 3331 if (!VLATy->getSizeExpr() || 3332 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3333 !EvalResult.Val.isInt()) 3334 return QualType(); 3335 3336 // Check whether the array size is negative. 3337 llvm::APSInt &Res = EvalResult.Val.getInt(); 3338 if (Res.isSigned() && Res.isNegative()) { 3339 SizeIsNegative = true; 3340 return QualType(); 3341 } 3342 3343 // Check whether the array is too large to be addressed. 3344 unsigned ActiveSizeBits 3345 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3346 Res); 3347 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3348 Oversized = Res; 3349 return QualType(); 3350 } 3351 3352 return Context.getConstantArrayType(VLATy->getElementType(), 3353 Res, ArrayType::Normal, 0); 3354} 3355 3356/// \brief Register the given locally-scoped external C declaration so 3357/// that it can be found later for redeclarations 3358void 3359Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3360 const LookupResult &Previous, 3361 Scope *S) { 3362 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3363 "Decl is not a locally-scoped decl!"); 3364 // Note that we have a locally-scoped external with this name. 3365 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3366 3367 if (!Previous.isSingleResult()) 3368 return; 3369 3370 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3371 3372 // If there was a previous declaration of this variable, it may be 3373 // in our identifier chain. Update the identifier chain with the new 3374 // declaration. 3375 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3376 // The previous declaration was found on the identifer resolver 3377 // chain, so remove it from its scope. 3378 3379 if (S->isDeclScope(PrevDecl)) { 3380 // Special case for redeclarations in the SAME scope. 3381 // Because this declaration is going to be added to the identifier chain 3382 // later, we should temporarily take it OFF the chain. 3383 IdResolver.RemoveDecl(ND); 3384 3385 } else { 3386 // Find the scope for the original declaration. 3387 while (S && !S->isDeclScope(PrevDecl)) 3388 S = S->getParent(); 3389 } 3390 3391 if (S) 3392 S->RemoveDecl(PrevDecl); 3393 } 3394} 3395 3396llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3397Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3398 if (ExternalSource) { 3399 // Load locally-scoped external decls from the external source. 3400 SmallVector<NamedDecl *, 4> Decls; 3401 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3402 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3403 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3404 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3405 if (Pos == LocallyScopedExternalDecls.end()) 3406 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3407 } 3408 } 3409 3410 return LocallyScopedExternalDecls.find(Name); 3411} 3412 3413/// \brief Diagnose function specifiers on a declaration of an identifier that 3414/// does not identify a function. 3415void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3416 // FIXME: We should probably indicate the identifier in question to avoid 3417 // confusion for constructs like "inline int a(), b;" 3418 if (D.getDeclSpec().isInlineSpecified()) 3419 Diag(D.getDeclSpec().getInlineSpecLoc(), 3420 diag::err_inline_non_function); 3421 3422 if (D.getDeclSpec().isVirtualSpecified()) 3423 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3424 diag::err_virtual_non_function); 3425 3426 if (D.getDeclSpec().isExplicitSpecified()) 3427 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3428 diag::err_explicit_non_function); 3429} 3430 3431NamedDecl* 3432Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3433 QualType R, TypeSourceInfo *TInfo, 3434 LookupResult &Previous, bool &Redeclaration) { 3435 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3436 if (D.getCXXScopeSpec().isSet()) { 3437 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3438 << D.getCXXScopeSpec().getRange(); 3439 D.setInvalidType(); 3440 // Pretend we didn't see the scope specifier. 3441 DC = CurContext; 3442 Previous.clear(); 3443 } 3444 3445 if (getLangOptions().CPlusPlus) { 3446 // Check that there are no default arguments (C++ only). 3447 CheckExtraCXXDefaultArguments(D); 3448 } 3449 3450 DiagnoseFunctionSpecifiers(D); 3451 3452 if (D.getDeclSpec().isThreadSpecified()) 3453 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3454 if (D.getDeclSpec().isConstexprSpecified()) 3455 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3456 << 1; 3457 3458 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3459 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3460 << D.getName().getSourceRange(); 3461 return 0; 3462 } 3463 3464 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3465 if (!NewTD) return 0; 3466 3467 // Handle attributes prior to checking for duplicates in MergeVarDecl 3468 ProcessDeclAttributes(S, NewTD, D); 3469 3470 CheckTypedefForVariablyModifiedType(S, NewTD); 3471 3472 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3473} 3474 3475void 3476Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3477 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3478 // then it shall have block scope. 3479 // Note that variably modified types must be fixed before merging the decl so 3480 // that redeclarations will match. 3481 QualType T = NewTD->getUnderlyingType(); 3482 if (T->isVariablyModifiedType()) { 3483 getCurFunction()->setHasBranchProtectedScope(); 3484 3485 if (S->getFnParent() == 0) { 3486 bool SizeIsNegative; 3487 llvm::APSInt Oversized; 3488 QualType FixedTy = 3489 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3490 Oversized); 3491 if (!FixedTy.isNull()) { 3492 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3493 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3494 } else { 3495 if (SizeIsNegative) 3496 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3497 else if (T->isVariableArrayType()) 3498 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3499 else if (Oversized.getBoolValue()) 3500 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3501 else 3502 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3503 NewTD->setInvalidDecl(); 3504 } 3505 } 3506 } 3507} 3508 3509 3510/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3511/// declares a typedef-name, either using the 'typedef' type specifier or via 3512/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3513NamedDecl* 3514Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3515 LookupResult &Previous, bool &Redeclaration) { 3516 // Merge the decl with the existing one if appropriate. If the decl is 3517 // in an outer scope, it isn't the same thing. 3518 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3519 /*ExplicitInstantiationOrSpecialization=*/false); 3520 if (!Previous.empty()) { 3521 Redeclaration = true; 3522 MergeTypedefNameDecl(NewTD, Previous); 3523 } 3524 3525 // If this is the C FILE type, notify the AST context. 3526 if (IdentifierInfo *II = NewTD->getIdentifier()) 3527 if (!NewTD->isInvalidDecl() && 3528 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3529 if (II->isStr("FILE")) 3530 Context.setFILEDecl(NewTD); 3531 else if (II->isStr("jmp_buf")) 3532 Context.setjmp_bufDecl(NewTD); 3533 else if (II->isStr("sigjmp_buf")) 3534 Context.setsigjmp_bufDecl(NewTD); 3535 else if (II->isStr("__builtin_va_list")) 3536 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3537 } 3538 3539 return NewTD; 3540} 3541 3542/// \brief Determines whether the given declaration is an out-of-scope 3543/// previous declaration. 3544/// 3545/// This routine should be invoked when name lookup has found a 3546/// previous declaration (PrevDecl) that is not in the scope where a 3547/// new declaration by the same name is being introduced. If the new 3548/// declaration occurs in a local scope, previous declarations with 3549/// linkage may still be considered previous declarations (C99 3550/// 6.2.2p4-5, C++ [basic.link]p6). 3551/// 3552/// \param PrevDecl the previous declaration found by name 3553/// lookup 3554/// 3555/// \param DC the context in which the new declaration is being 3556/// declared. 3557/// 3558/// \returns true if PrevDecl is an out-of-scope previous declaration 3559/// for a new delcaration with the same name. 3560static bool 3561isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3562 ASTContext &Context) { 3563 if (!PrevDecl) 3564 return false; 3565 3566 if (!PrevDecl->hasLinkage()) 3567 return false; 3568 3569 if (Context.getLangOptions().CPlusPlus) { 3570 // C++ [basic.link]p6: 3571 // If there is a visible declaration of an entity with linkage 3572 // having the same name and type, ignoring entities declared 3573 // outside the innermost enclosing namespace scope, the block 3574 // scope declaration declares that same entity and receives the 3575 // linkage of the previous declaration. 3576 DeclContext *OuterContext = DC->getRedeclContext(); 3577 if (!OuterContext->isFunctionOrMethod()) 3578 // This rule only applies to block-scope declarations. 3579 return false; 3580 3581 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3582 if (PrevOuterContext->isRecord()) 3583 // We found a member function: ignore it. 3584 return false; 3585 3586 // Find the innermost enclosing namespace for the new and 3587 // previous declarations. 3588 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3589 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3590 3591 // The previous declaration is in a different namespace, so it 3592 // isn't the same function. 3593 if (!OuterContext->Equals(PrevOuterContext)) 3594 return false; 3595 } 3596 3597 return true; 3598} 3599 3600static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3601 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3602 if (!SS.isSet()) return; 3603 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3604} 3605 3606bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3607 QualType type = decl->getType(); 3608 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3609 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3610 // Various kinds of declaration aren't allowed to be __autoreleasing. 3611 unsigned kind = -1U; 3612 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3613 if (var->hasAttr<BlocksAttr>()) 3614 kind = 0; // __block 3615 else if (!var->hasLocalStorage()) 3616 kind = 1; // global 3617 } else if (isa<ObjCIvarDecl>(decl)) { 3618 kind = 3; // ivar 3619 } else if (isa<FieldDecl>(decl)) { 3620 kind = 2; // field 3621 } 3622 3623 if (kind != -1U) { 3624 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3625 << kind; 3626 } 3627 } else if (lifetime == Qualifiers::OCL_None) { 3628 // Try to infer lifetime. 3629 if (!type->isObjCLifetimeType()) 3630 return false; 3631 3632 lifetime = type->getObjCARCImplicitLifetime(); 3633 type = Context.getLifetimeQualifiedType(type, lifetime); 3634 decl->setType(type); 3635 } 3636 3637 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3638 // Thread-local variables cannot have lifetime. 3639 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3640 var->isThreadSpecified()) { 3641 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3642 << var->getType(); 3643 return true; 3644 } 3645 } 3646 3647 return false; 3648} 3649 3650NamedDecl* 3651Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3652 QualType R, TypeSourceInfo *TInfo, 3653 LookupResult &Previous, 3654 MultiTemplateParamsArg TemplateParamLists, 3655 bool &Redeclaration) { 3656 DeclarationName Name = GetNameForDeclarator(D).getName(); 3657 3658 // Check that there are no default arguments (C++ only). 3659 if (getLangOptions().CPlusPlus) 3660 CheckExtraCXXDefaultArguments(D); 3661 3662 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3663 assert(SCSpec != DeclSpec::SCS_typedef && 3664 "Parser allowed 'typedef' as storage class VarDecl."); 3665 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3666 if (SCSpec == DeclSpec::SCS_mutable) { 3667 // mutable can only appear on non-static class members, so it's always 3668 // an error here 3669 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3670 D.setInvalidType(); 3671 SC = SC_None; 3672 } 3673 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3674 VarDecl::StorageClass SCAsWritten 3675 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3676 3677 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3678 if (!II) { 3679 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3680 << Name.getAsString(); 3681 return 0; 3682 } 3683 3684 DiagnoseFunctionSpecifiers(D); 3685 3686 if (!DC->isRecord() && S->getFnParent() == 0) { 3687 // C99 6.9p2: The storage-class specifiers auto and register shall not 3688 // appear in the declaration specifiers in an external declaration. 3689 if (SC == SC_Auto || SC == SC_Register) { 3690 3691 // If this is a register variable with an asm label specified, then this 3692 // is a GNU extension. 3693 if (SC == SC_Register && D.getAsmLabel()) 3694 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3695 else 3696 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3697 D.setInvalidType(); 3698 } 3699 } 3700 3701 bool isExplicitSpecialization = false; 3702 VarDecl *NewVD; 3703 if (!getLangOptions().CPlusPlus) { 3704 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3705 D.getIdentifierLoc(), II, 3706 R, TInfo, SC, SCAsWritten); 3707 3708 if (D.isInvalidType()) 3709 NewVD->setInvalidDecl(); 3710 } else { 3711 if (DC->isRecord() && !CurContext->isRecord()) { 3712 // This is an out-of-line definition of a static data member. 3713 if (SC == SC_Static) { 3714 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3715 diag::err_static_out_of_line) 3716 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3717 } else if (SC == SC_None) 3718 SC = SC_Static; 3719 } 3720 if (SC == SC_Static) { 3721 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3722 if (RD->isLocalClass()) 3723 Diag(D.getIdentifierLoc(), 3724 diag::err_static_data_member_not_allowed_in_local_class) 3725 << Name << RD->getDeclName(); 3726 3727 // C++ [class.union]p1: If a union contains a static data member, 3728 // the program is ill-formed. 3729 // 3730 // We also disallow static data members in anonymous structs. 3731 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3732 Diag(D.getIdentifierLoc(), 3733 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3734 << Name << RD->isUnion(); 3735 } 3736 } 3737 3738 // Match up the template parameter lists with the scope specifier, then 3739 // determine whether we have a template or a template specialization. 3740 isExplicitSpecialization = false; 3741 bool Invalid = false; 3742 if (TemplateParameterList *TemplateParams 3743 = MatchTemplateParametersToScopeSpecifier( 3744 D.getDeclSpec().getSourceRange().getBegin(), 3745 D.getIdentifierLoc(), 3746 D.getCXXScopeSpec(), 3747 TemplateParamLists.get(), 3748 TemplateParamLists.size(), 3749 /*never a friend*/ false, 3750 isExplicitSpecialization, 3751 Invalid)) { 3752 if (TemplateParams->size() > 0) { 3753 // There is no such thing as a variable template. 3754 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3755 << II 3756 << SourceRange(TemplateParams->getTemplateLoc(), 3757 TemplateParams->getRAngleLoc()); 3758 return 0; 3759 } else { 3760 // There is an extraneous 'template<>' for this variable. Complain 3761 // about it, but allow the declaration of the variable. 3762 Diag(TemplateParams->getTemplateLoc(), 3763 diag::err_template_variable_noparams) 3764 << II 3765 << SourceRange(TemplateParams->getTemplateLoc(), 3766 TemplateParams->getRAngleLoc()); 3767 } 3768 } 3769 3770 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3771 D.getIdentifierLoc(), II, 3772 R, TInfo, SC, SCAsWritten); 3773 3774 // If this decl has an auto type in need of deduction, make a note of the 3775 // Decl so we can diagnose uses of it in its own initializer. 3776 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3777 R->getContainedAutoType()) 3778 ParsingInitForAutoVars.insert(NewVD); 3779 3780 if (D.isInvalidType() || Invalid) 3781 NewVD->setInvalidDecl(); 3782 3783 SetNestedNameSpecifier(NewVD, D); 3784 3785 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3786 NewVD->setTemplateParameterListsInfo(Context, 3787 TemplateParamLists.size(), 3788 TemplateParamLists.release()); 3789 } 3790 3791 if (D.getDeclSpec().isConstexprSpecified()) { 3792 // FIXME: check this is a valid use of constexpr. 3793 NewVD->setConstexpr(true); 3794 } 3795 } 3796 3797 if (D.getDeclSpec().isThreadSpecified()) { 3798 if (NewVD->hasLocalStorage()) 3799 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3800 else if (!Context.getTargetInfo().isTLSSupported()) 3801 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3802 else 3803 NewVD->setThreadSpecified(true); 3804 } 3805 3806 // Set the lexical context. If the declarator has a C++ scope specifier, the 3807 // lexical context will be different from the semantic context. 3808 NewVD->setLexicalDeclContext(CurContext); 3809 3810 // Handle attributes prior to checking for duplicates in MergeVarDecl 3811 ProcessDeclAttributes(S, NewVD, D); 3812 3813 // In auto-retain/release, infer strong retension for variables of 3814 // retainable type. 3815 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3816 NewVD->setInvalidDecl(); 3817 3818 // Handle GNU asm-label extension (encoded as an attribute). 3819 if (Expr *E = (Expr*)D.getAsmLabel()) { 3820 // The parser guarantees this is a string. 3821 StringLiteral *SE = cast<StringLiteral>(E); 3822 StringRef Label = SE->getString(); 3823 if (S->getFnParent() != 0) { 3824 switch (SC) { 3825 case SC_None: 3826 case SC_Auto: 3827 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3828 break; 3829 case SC_Register: 3830 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3831 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3832 break; 3833 case SC_Static: 3834 case SC_Extern: 3835 case SC_PrivateExtern: 3836 break; 3837 } 3838 } 3839 3840 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3841 Context, Label)); 3842 } 3843 3844 // Diagnose shadowed variables before filtering for scope. 3845 if (!D.getCXXScopeSpec().isSet()) 3846 CheckShadow(S, NewVD, Previous); 3847 3848 // Don't consider existing declarations that are in a different 3849 // scope and are out-of-semantic-context declarations (if the new 3850 // declaration has linkage). 3851 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3852 isExplicitSpecialization); 3853 3854 if (!getLangOptions().CPlusPlus) 3855 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3856 else { 3857 // Merge the decl with the existing one if appropriate. 3858 if (!Previous.empty()) { 3859 if (Previous.isSingleResult() && 3860 isa<FieldDecl>(Previous.getFoundDecl()) && 3861 D.getCXXScopeSpec().isSet()) { 3862 // The user tried to define a non-static data member 3863 // out-of-line (C++ [dcl.meaning]p1). 3864 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3865 << D.getCXXScopeSpec().getRange(); 3866 Previous.clear(); 3867 NewVD->setInvalidDecl(); 3868 } 3869 } else if (D.getCXXScopeSpec().isSet()) { 3870 // No previous declaration in the qualifying scope. 3871 Diag(D.getIdentifierLoc(), diag::err_no_member) 3872 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3873 << D.getCXXScopeSpec().getRange(); 3874 NewVD->setInvalidDecl(); 3875 } 3876 3877 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3878 3879 // This is an explicit specialization of a static data member. Check it. 3880 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3881 CheckMemberSpecialization(NewVD, Previous)) 3882 NewVD->setInvalidDecl(); 3883 } 3884 3885 // attributes declared post-definition are currently ignored 3886 // FIXME: This should be handled in attribute merging, not 3887 // here. 3888 if (Previous.isSingleResult()) { 3889 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3890 if (Def && (Def = Def->getDefinition()) && 3891 Def != NewVD && D.hasAttributes()) { 3892 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3893 Diag(Def->getLocation(), diag::note_previous_definition); 3894 } 3895 } 3896 3897 // If this is a locally-scoped extern C variable, update the map of 3898 // such variables. 3899 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3900 !NewVD->isInvalidDecl()) 3901 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3902 3903 // If there's a #pragma GCC visibility in scope, and this isn't a class 3904 // member, set the visibility of this variable. 3905 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3906 AddPushedVisibilityAttribute(NewVD); 3907 3908 MarkUnusedFileScopedDecl(NewVD); 3909 3910 return NewVD; 3911} 3912 3913/// \brief Diagnose variable or built-in function shadowing. Implements 3914/// -Wshadow. 3915/// 3916/// This method is called whenever a VarDecl is added to a "useful" 3917/// scope. 3918/// 3919/// \param S the scope in which the shadowing name is being declared 3920/// \param R the lookup of the name 3921/// 3922void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3923 // Return if warning is ignored. 3924 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3925 Diagnostic::Ignored) 3926 return; 3927 3928 // Don't diagnose declarations at file scope. 3929 if (D->hasGlobalStorage()) 3930 return; 3931 3932 DeclContext *NewDC = D->getDeclContext(); 3933 3934 // Only diagnose if we're shadowing an unambiguous field or variable. 3935 if (R.getResultKind() != LookupResult::Found) 3936 return; 3937 3938 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3939 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3940 return; 3941 3942 // Fields are not shadowed by variables in C++ static methods. 3943 if (isa<FieldDecl>(ShadowedDecl)) 3944 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 3945 if (MD->isStatic()) 3946 return; 3947 3948 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 3949 if (shadowedVar->isExternC()) { 3950 // For shadowing external vars, make sure that we point to the global 3951 // declaration, not a locally scoped extern declaration. 3952 for (VarDecl::redecl_iterator 3953 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 3954 I != E; ++I) 3955 if (I->isFileVarDecl()) { 3956 ShadowedDecl = *I; 3957 break; 3958 } 3959 } 3960 3961 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3962 3963 // Only warn about certain kinds of shadowing for class members. 3964 if (NewDC && NewDC->isRecord()) { 3965 // In particular, don't warn about shadowing non-class members. 3966 if (!OldDC->isRecord()) 3967 return; 3968 3969 // TODO: should we warn about static data members shadowing 3970 // static data members from base classes? 3971 3972 // TODO: don't diagnose for inaccessible shadowed members. 3973 // This is hard to do perfectly because we might friend the 3974 // shadowing context, but that's just a false negative. 3975 } 3976 3977 // Determine what kind of declaration we're shadowing. 3978 unsigned Kind; 3979 if (isa<RecordDecl>(OldDC)) { 3980 if (isa<FieldDecl>(ShadowedDecl)) 3981 Kind = 3; // field 3982 else 3983 Kind = 2; // static data member 3984 } else if (OldDC->isFileContext()) 3985 Kind = 1; // global 3986 else 3987 Kind = 0; // local 3988 3989 DeclarationName Name = R.getLookupName(); 3990 3991 // Emit warning and note. 3992 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3993 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3994} 3995 3996/// \brief Check -Wshadow without the advantage of a previous lookup. 3997void Sema::CheckShadow(Scope *S, VarDecl *D) { 3998 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 3999 Diagnostic::Ignored) 4000 return; 4001 4002 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4003 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4004 LookupName(R, S); 4005 CheckShadow(S, D, R); 4006} 4007 4008/// \brief Perform semantic checking on a newly-created variable 4009/// declaration. 4010/// 4011/// This routine performs all of the type-checking required for a 4012/// variable declaration once it has been built. It is used both to 4013/// check variables after they have been parsed and their declarators 4014/// have been translated into a declaration, and to check variables 4015/// that have been instantiated from a template. 4016/// 4017/// Sets NewVD->isInvalidDecl() if an error was encountered. 4018void Sema::CheckVariableDeclaration(VarDecl *NewVD, 4019 LookupResult &Previous, 4020 bool &Redeclaration) { 4021 // If the decl is already known invalid, don't check it. 4022 if (NewVD->isInvalidDecl()) 4023 return; 4024 4025 QualType T = NewVD->getType(); 4026 4027 if (T->isObjCObjectType()) { 4028 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4029 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4030 T = Context.getObjCObjectPointerType(T); 4031 NewVD->setType(T); 4032 } 4033 4034 // Emit an error if an address space was applied to decl with local storage. 4035 // This includes arrays of objects with address space qualifiers, but not 4036 // automatic variables that point to other address spaces. 4037 // ISO/IEC TR 18037 S5.1.2 4038 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4039 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4040 return NewVD->setInvalidDecl(); 4041 } 4042 4043 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4044 && !NewVD->hasAttr<BlocksAttr>()) { 4045 if (getLangOptions().getGCMode() != LangOptions::NonGC) 4046 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4047 else 4048 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4049 } 4050 4051 bool isVM = T->isVariablyModifiedType(); 4052 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4053 NewVD->hasAttr<BlocksAttr>()) 4054 getCurFunction()->setHasBranchProtectedScope(); 4055 4056 if ((isVM && NewVD->hasLinkage()) || 4057 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4058 bool SizeIsNegative; 4059 llvm::APSInt Oversized; 4060 QualType FixedTy = 4061 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4062 Oversized); 4063 4064 if (FixedTy.isNull() && T->isVariableArrayType()) { 4065 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4066 // FIXME: This won't give the correct result for 4067 // int a[10][n]; 4068 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4069 4070 if (NewVD->isFileVarDecl()) 4071 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4072 << SizeRange; 4073 else if (NewVD->getStorageClass() == SC_Static) 4074 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4075 << SizeRange; 4076 else 4077 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4078 << SizeRange; 4079 return NewVD->setInvalidDecl(); 4080 } 4081 4082 if (FixedTy.isNull()) { 4083 if (NewVD->isFileVarDecl()) 4084 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4085 else 4086 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4087 return NewVD->setInvalidDecl(); 4088 } 4089 4090 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4091 NewVD->setType(FixedTy); 4092 } 4093 4094 if (Previous.empty() && NewVD->isExternC()) { 4095 // Since we did not find anything by this name and we're declaring 4096 // an extern "C" variable, look for a non-visible extern "C" 4097 // declaration with the same name. 4098 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4099 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4100 if (Pos != LocallyScopedExternalDecls.end()) 4101 Previous.addDecl(Pos->second); 4102 } 4103 4104 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4105 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4106 << T; 4107 return NewVD->setInvalidDecl(); 4108 } 4109 4110 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4111 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4112 return NewVD->setInvalidDecl(); 4113 } 4114 4115 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4116 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4117 return NewVD->setInvalidDecl(); 4118 } 4119 4120 // Function pointers and references cannot have qualified function type, only 4121 // function pointer-to-members can do that. 4122 QualType Pointee; 4123 unsigned PtrOrRef = 0; 4124 if (const PointerType *Ptr = T->getAs<PointerType>()) 4125 Pointee = Ptr->getPointeeType(); 4126 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4127 Pointee = Ref->getPointeeType(); 4128 PtrOrRef = 1; 4129 } 4130 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4131 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4132 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4133 << PtrOrRef; 4134 return NewVD->setInvalidDecl(); 4135 } 4136 4137 if (!Previous.empty()) { 4138 Redeclaration = true; 4139 MergeVarDecl(NewVD, Previous); 4140 } 4141} 4142 4143/// \brief Data used with FindOverriddenMethod 4144struct FindOverriddenMethodData { 4145 Sema *S; 4146 CXXMethodDecl *Method; 4147}; 4148 4149/// \brief Member lookup function that determines whether a given C++ 4150/// method overrides a method in a base class, to be used with 4151/// CXXRecordDecl::lookupInBases(). 4152static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4153 CXXBasePath &Path, 4154 void *UserData) { 4155 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4156 4157 FindOverriddenMethodData *Data 4158 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4159 4160 DeclarationName Name = Data->Method->getDeclName(); 4161 4162 // FIXME: Do we care about other names here too? 4163 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4164 // We really want to find the base class destructor here. 4165 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4166 CanQualType CT = Data->S->Context.getCanonicalType(T); 4167 4168 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4169 } 4170 4171 for (Path.Decls = BaseRecord->lookup(Name); 4172 Path.Decls.first != Path.Decls.second; 4173 ++Path.Decls.first) { 4174 NamedDecl *D = *Path.Decls.first; 4175 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4176 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4177 return true; 4178 } 4179 } 4180 4181 return false; 4182} 4183 4184/// AddOverriddenMethods - See if a method overrides any in the base classes, 4185/// and if so, check that it's a valid override and remember it. 4186bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4187 // Look for virtual methods in base classes that this method might override. 4188 CXXBasePaths Paths; 4189 FindOverriddenMethodData Data; 4190 Data.Method = MD; 4191 Data.S = this; 4192 bool AddedAny = false; 4193 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4194 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4195 E = Paths.found_decls_end(); I != E; ++I) { 4196 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4197 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4198 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4199 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4200 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4201 AddedAny = true; 4202 } 4203 } 4204 } 4205 } 4206 4207 return AddedAny; 4208} 4209 4210static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD, 4211 bool isFriendDecl) { 4212 DeclarationName Name = NewFD->getDeclName(); 4213 DeclContext *DC = NewFD->getDeclContext(); 4214 LookupResult Prev(S, Name, NewFD->getLocation(), 4215 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4216 llvm::SmallVector<unsigned, 1> MismatchedParams; 4217 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4218 TypoCorrection Correction; 4219 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4220 : diag::err_member_def_does_not_match; 4221 4222 NewFD->setInvalidDecl(); 4223 S.LookupQualifiedName(Prev, DC); 4224 assert(!Prev.isAmbiguous() && 4225 "Cannot have an ambiguity in previous-declaration lookup"); 4226 if (!Prev.empty()) { 4227 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4228 Func != FuncEnd; ++Func) { 4229 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4230 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4231 MismatchedParams)) { 4232 // Add 1 to the index so that 0 can mean the mismatch didn't 4233 // involve a parameter 4234 unsigned ParamNum = 4235 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4236 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4237 } 4238 } 4239 // If the qualified name lookup yielded nothing, try typo correction 4240 } else if ((Correction = S.CorrectTypo(Prev.getLookupNameInfo(), 4241 Prev.getLookupKind(), 0, 0, DC)) && 4242 Correction.getCorrection() != Name) { 4243 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4244 : diag::err_member_def_does_not_match_suggest; 4245 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4246 CDeclEnd = Correction.end(); 4247 CDecl != CDeclEnd; ++CDecl) { 4248 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4249 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4250 MismatchedParams)) { 4251 // Add 1 to the index so that 0 can mean the mismatch didn't 4252 // involve a parameter 4253 unsigned ParamNum = 4254 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4255 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4256 } 4257 } 4258 } 4259 4260 if (Correction) 4261 S.Diag(NewFD->getLocation(), DiagMsg) 4262 << Name << DC << Correction.getQuoted(S.getLangOptions()) 4263 << FixItHint::CreateReplacement( 4264 NewFD->getLocation(), Correction.getAsString(S.getLangOptions())); 4265 else 4266 S.Diag(NewFD->getLocation(), DiagMsg) << Name << DC << NewFD->getLocation(); 4267 4268 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4269 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4270 NearMatch != NearMatchEnd; ++NearMatch) { 4271 FunctionDecl *FD = NearMatch->first; 4272 4273 if (unsigned Idx = NearMatch->second) { 4274 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4275 S.Diag(FDParam->getTypeSpecStartLoc(), 4276 diag::note_member_def_close_param_match) 4277 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4278 } else if (Correction) { 4279 S.Diag(FD->getLocation(), diag::note_previous_decl) 4280 << Correction.getQuoted(S.getLangOptions()); 4281 } else 4282 S.Diag(FD->getLocation(), diag::note_member_def_close_match); 4283 } 4284} 4285 4286NamedDecl* 4287Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4288 QualType R, TypeSourceInfo *TInfo, 4289 LookupResult &Previous, 4290 MultiTemplateParamsArg TemplateParamLists, 4291 bool IsFunctionDefinition, bool &Redeclaration, 4292 bool &AddToScope) { 4293 assert(R.getTypePtr()->isFunctionType()); 4294 4295 // TODO: consider using NameInfo for diagnostic. 4296 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4297 DeclarationName Name = NameInfo.getName(); 4298 FunctionDecl::StorageClass SC = SC_None; 4299 switch (D.getDeclSpec().getStorageClassSpec()) { 4300 default: assert(0 && "Unknown storage class!"); 4301 case DeclSpec::SCS_auto: 4302 case DeclSpec::SCS_register: 4303 case DeclSpec::SCS_mutable: 4304 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4305 diag::err_typecheck_sclass_func); 4306 D.setInvalidType(); 4307 break; 4308 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4309 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4310 case DeclSpec::SCS_static: { 4311 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4312 // C99 6.7.1p5: 4313 // The declaration of an identifier for a function that has 4314 // block scope shall have no explicit storage-class specifier 4315 // other than extern 4316 // See also (C++ [dcl.stc]p4). 4317 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4318 diag::err_static_block_func); 4319 SC = SC_None; 4320 } else 4321 SC = SC_Static; 4322 break; 4323 } 4324 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4325 } 4326 4327 if (D.getDeclSpec().isThreadSpecified()) 4328 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4329 4330 // Do not allow returning a objc interface by-value. 4331 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4332 Diag(D.getIdentifierLoc(), 4333 diag::err_object_cannot_be_passed_returned_by_value) << 0 4334 << R->getAs<FunctionType>()->getResultType() 4335 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4336 4337 QualType T = R->getAs<FunctionType>()->getResultType(); 4338 T = Context.getObjCObjectPointerType(T); 4339 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4340 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4341 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4342 FPT->getNumArgs(), EPI); 4343 } 4344 else if (isa<FunctionNoProtoType>(R)) 4345 R = Context.getFunctionNoProtoType(T); 4346 } 4347 4348 FunctionDecl *NewFD; 4349 bool isInline = D.getDeclSpec().isInlineSpecified(); 4350 bool isFriend = false; 4351 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4352 FunctionDecl::StorageClass SCAsWritten 4353 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4354 FunctionTemplateDecl *FunctionTemplate = 0; 4355 bool isExplicitSpecialization = false; 4356 bool isFunctionTemplateSpecialization = false; 4357 bool isDependentClassScopeExplicitSpecialization = false; 4358 4359 if (!getLangOptions().CPlusPlus) { 4360 // Determine whether the function was written with a 4361 // prototype. This true when: 4362 // - there is a prototype in the declarator, or 4363 // - the type R of the function is some kind of typedef or other reference 4364 // to a type name (which eventually refers to a function type). 4365 bool HasPrototype = 4366 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4367 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4368 4369 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4370 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4371 HasPrototype); 4372 if (D.isInvalidType()) 4373 NewFD->setInvalidDecl(); 4374 4375 // Set the lexical context. 4376 NewFD->setLexicalDeclContext(CurContext); 4377 // Filter out previous declarations that don't match the scope. 4378 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4379 /*ExplicitInstantiationOrSpecialization=*/false); 4380 } else { 4381 isFriend = D.getDeclSpec().isFriendSpecified(); 4382 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4383 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4384 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4385 bool isVirtualOkay = false; 4386 4387 // Check that the return type is not an abstract class type. 4388 // For record types, this is done by the AbstractClassUsageDiagnoser once 4389 // the class has been completely parsed. 4390 if (!DC->isRecord() && 4391 RequireNonAbstractType(D.getIdentifierLoc(), 4392 R->getAs<FunctionType>()->getResultType(), 4393 diag::err_abstract_type_in_decl, 4394 AbstractReturnType)) 4395 D.setInvalidType(); 4396 4397 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4398 // This is a C++ constructor declaration. 4399 assert(DC->isRecord() && 4400 "Constructors can only be declared in a member context"); 4401 4402 R = CheckConstructorDeclarator(D, R, SC); 4403 4404 // Create the new declaration 4405 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4406 Context, 4407 cast<CXXRecordDecl>(DC), 4408 D.getSourceRange().getBegin(), 4409 NameInfo, R, TInfo, 4410 isExplicit, isInline, 4411 /*isImplicitlyDeclared=*/false, 4412 isConstexpr); 4413 4414 NewFD = NewCD; 4415 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4416 // This is a C++ destructor declaration. 4417 if (DC->isRecord()) { 4418 R = CheckDestructorDeclarator(D, R, SC); 4419 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4420 4421 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4422 D.getSourceRange().getBegin(), 4423 NameInfo, R, TInfo, 4424 isInline, 4425 /*isImplicitlyDeclared=*/false); 4426 NewFD = NewDD; 4427 isVirtualOkay = true; 4428 4429 // If the class is complete, then we now create the implicit exception 4430 // specification. If the class is incomplete or dependent, we can't do 4431 // it yet. 4432 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4433 Record->getDefinition() && !Record->isBeingDefined() && 4434 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4435 AdjustDestructorExceptionSpec(Record, NewDD); 4436 } 4437 4438 } else { 4439 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4440 4441 // Create a FunctionDecl to satisfy the function definition parsing 4442 // code path. 4443 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4444 D.getIdentifierLoc(), Name, R, TInfo, 4445 SC, SCAsWritten, isInline, 4446 /*hasPrototype=*/true, isConstexpr); 4447 D.setInvalidType(); 4448 } 4449 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4450 if (!DC->isRecord()) { 4451 Diag(D.getIdentifierLoc(), 4452 diag::err_conv_function_not_member); 4453 return 0; 4454 } 4455 4456 CheckConversionDeclarator(D, R, SC); 4457 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4458 D.getSourceRange().getBegin(), 4459 NameInfo, R, TInfo, 4460 isInline, isExplicit, isConstexpr, 4461 SourceLocation()); 4462 4463 isVirtualOkay = true; 4464 } else if (DC->isRecord()) { 4465 // If the name of the function is the same as the name of the record, 4466 // then this must be an invalid constructor that has a return type. 4467 // (The parser checks for a return type and makes the declarator a 4468 // constructor if it has no return type). 4469 if (Name.getAsIdentifierInfo() && 4470 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4471 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4472 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4473 << SourceRange(D.getIdentifierLoc()); 4474 return 0; 4475 } 4476 4477 bool isStatic = SC == SC_Static; 4478 4479 // [class.free]p1: 4480 // Any allocation function for a class T is a static member 4481 // (even if not explicitly declared static). 4482 if (Name.getCXXOverloadedOperator() == OO_New || 4483 Name.getCXXOverloadedOperator() == OO_Array_New) 4484 isStatic = true; 4485 4486 // [class.free]p6 Any deallocation function for a class X is a static member 4487 // (even if not explicitly declared static). 4488 if (Name.getCXXOverloadedOperator() == OO_Delete || 4489 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4490 isStatic = true; 4491 4492 // This is a C++ method declaration. 4493 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4494 Context, cast<CXXRecordDecl>(DC), 4495 D.getSourceRange().getBegin(), 4496 NameInfo, R, TInfo, 4497 isStatic, SCAsWritten, isInline, 4498 isConstexpr, 4499 SourceLocation()); 4500 NewFD = NewMD; 4501 4502 isVirtualOkay = !isStatic; 4503 } else { 4504 // Determine whether the function was written with a 4505 // prototype. This true when: 4506 // - we're in C++ (where every function has a prototype), 4507 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4508 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4509 true/*HasPrototype*/, isConstexpr); 4510 } 4511 4512 if (isFriend && !isInline && IsFunctionDefinition) { 4513 // C++ [class.friend]p5 4514 // A function can be defined in a friend declaration of a 4515 // class . . . . Such a function is implicitly inline. 4516 NewFD->setImplicitlyInline(); 4517 } 4518 4519 SetNestedNameSpecifier(NewFD, D); 4520 isExplicitSpecialization = false; 4521 isFunctionTemplateSpecialization = false; 4522 if (D.isInvalidType()) 4523 NewFD->setInvalidDecl(); 4524 4525 // Set the lexical context. If the declarator has a C++ 4526 // scope specifier, or is the object of a friend declaration, the 4527 // lexical context will be different from the semantic context. 4528 NewFD->setLexicalDeclContext(CurContext); 4529 4530 // Match up the template parameter lists with the scope specifier, then 4531 // determine whether we have a template or a template specialization. 4532 bool Invalid = false; 4533 if (TemplateParameterList *TemplateParams 4534 = MatchTemplateParametersToScopeSpecifier( 4535 D.getDeclSpec().getSourceRange().getBegin(), 4536 D.getIdentifierLoc(), 4537 D.getCXXScopeSpec(), 4538 TemplateParamLists.get(), 4539 TemplateParamLists.size(), 4540 isFriend, 4541 isExplicitSpecialization, 4542 Invalid)) { 4543 if (TemplateParams->size() > 0) { 4544 // This is a function template 4545 4546 // Check that we can declare a template here. 4547 if (CheckTemplateDeclScope(S, TemplateParams)) 4548 return 0; 4549 4550 // A destructor cannot be a template. 4551 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4552 Diag(NewFD->getLocation(), diag::err_destructor_template); 4553 return 0; 4554 } 4555 4556 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4557 NewFD->getLocation(), 4558 Name, TemplateParams, 4559 NewFD); 4560 FunctionTemplate->setLexicalDeclContext(CurContext); 4561 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4562 4563 // For source fidelity, store the other template param lists. 4564 if (TemplateParamLists.size() > 1) { 4565 NewFD->setTemplateParameterListsInfo(Context, 4566 TemplateParamLists.size() - 1, 4567 TemplateParamLists.release()); 4568 } 4569 } else { 4570 // This is a function template specialization. 4571 isFunctionTemplateSpecialization = true; 4572 // For source fidelity, store all the template param lists. 4573 NewFD->setTemplateParameterListsInfo(Context, 4574 TemplateParamLists.size(), 4575 TemplateParamLists.release()); 4576 4577 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4578 if (isFriend) { 4579 // We want to remove the "template<>", found here. 4580 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4581 4582 // If we remove the template<> and the name is not a 4583 // template-id, we're actually silently creating a problem: 4584 // the friend declaration will refer to an untemplated decl, 4585 // and clearly the user wants a template specialization. So 4586 // we need to insert '<>' after the name. 4587 SourceLocation InsertLoc; 4588 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4589 InsertLoc = D.getName().getSourceRange().getEnd(); 4590 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4591 } 4592 4593 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4594 << Name << RemoveRange 4595 << FixItHint::CreateRemoval(RemoveRange) 4596 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4597 } 4598 } 4599 } 4600 else { 4601 // All template param lists were matched against the scope specifier: 4602 // this is NOT (an explicit specialization of) a template. 4603 if (TemplateParamLists.size() > 0) 4604 // For source fidelity, store all the template param lists. 4605 NewFD->setTemplateParameterListsInfo(Context, 4606 TemplateParamLists.size(), 4607 TemplateParamLists.release()); 4608 } 4609 4610 if (Invalid) { 4611 NewFD->setInvalidDecl(); 4612 if (FunctionTemplate) 4613 FunctionTemplate->setInvalidDecl(); 4614 } 4615 4616 // C++ [dcl.fct.spec]p5: 4617 // The virtual specifier shall only be used in declarations of 4618 // nonstatic class member functions that appear within a 4619 // member-specification of a class declaration; see 10.3. 4620 // 4621 if (isVirtual && !NewFD->isInvalidDecl()) { 4622 if (!isVirtualOkay) { 4623 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4624 diag::err_virtual_non_function); 4625 } else if (!CurContext->isRecord()) { 4626 // 'virtual' was specified outside of the class. 4627 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4628 diag::err_virtual_out_of_class) 4629 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4630 } else if (NewFD->getDescribedFunctionTemplate()) { 4631 // C++ [temp.mem]p3: 4632 // A member function template shall not be virtual. 4633 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4634 diag::err_virtual_member_function_template) 4635 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4636 } else { 4637 // Okay: Add virtual to the method. 4638 NewFD->setVirtualAsWritten(true); 4639 } 4640 } 4641 4642 // C++ [dcl.fct.spec]p3: 4643 // The inline specifier shall not appear on a block scope function declaration. 4644 if (isInline && !NewFD->isInvalidDecl()) { 4645 if (CurContext->isFunctionOrMethod()) { 4646 // 'inline' is not allowed on block scope function declaration. 4647 Diag(D.getDeclSpec().getInlineSpecLoc(), 4648 diag::err_inline_declaration_block_scope) << Name 4649 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4650 } 4651 } 4652 4653 // C++ [dcl.fct.spec]p6: 4654 // The explicit specifier shall be used only in the declaration of a 4655 // constructor or conversion function within its class definition; see 12.3.1 4656 // and 12.3.2. 4657 if (isExplicit && !NewFD->isInvalidDecl()) { 4658 if (!CurContext->isRecord()) { 4659 // 'explicit' was specified outside of the class. 4660 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4661 diag::err_explicit_out_of_class) 4662 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4663 } else if (!isa<CXXConstructorDecl>(NewFD) && 4664 !isa<CXXConversionDecl>(NewFD)) { 4665 // 'explicit' was specified on a function that wasn't a constructor 4666 // or conversion function. 4667 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4668 diag::err_explicit_non_ctor_or_conv_function) 4669 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4670 } 4671 } 4672 4673 if (isConstexpr) { 4674 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4675 // are implicitly inline. 4676 NewFD->setImplicitlyInline(); 4677 4678 // FIXME: If this is a redeclaration, check the original declaration was 4679 // marked constepr. 4680 4681 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4682 // be either constructors or to return a literal type. Therefore, 4683 // destructors cannot be declared constexpr. 4684 if (isa<CXXDestructorDecl>(NewFD)) 4685 Diag(D.getDeclSpec().getConstexprSpecLoc(), 4686 diag::err_constexpr_dtor); 4687 } 4688 4689 4690 // Filter out previous declarations that don't match the scope. 4691 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4692 isExplicitSpecialization || 4693 isFunctionTemplateSpecialization); 4694 4695 if (isFriend) { 4696 // For now, claim that the objects have no previous declaration. 4697 if (FunctionTemplate) { 4698 FunctionTemplate->setObjectOfFriendDecl(false); 4699 FunctionTemplate->setAccess(AS_public); 4700 } 4701 NewFD->setObjectOfFriendDecl(false); 4702 NewFD->setAccess(AS_public); 4703 } 4704 4705 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4706 // A method is implicitly inline if it's defined in its class 4707 // definition. 4708 NewFD->setImplicitlyInline(); 4709 } 4710 4711 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4712 !CurContext->isRecord()) { 4713 // C++ [class.static]p1: 4714 // A data or function member of a class may be declared static 4715 // in a class definition, in which case it is a static member of 4716 // the class. 4717 4718 // Complain about the 'static' specifier if it's on an out-of-line 4719 // member function definition. 4720 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4721 diag::err_static_out_of_line) 4722 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4723 } 4724 } 4725 4726 // Handle GNU asm-label extension (encoded as an attribute). 4727 if (Expr *E = (Expr*) D.getAsmLabel()) { 4728 // The parser guarantees this is a string. 4729 StringLiteral *SE = cast<StringLiteral>(E); 4730 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4731 SE->getString())); 4732 } 4733 4734 // Copy the parameter declarations from the declarator D to the function 4735 // declaration NewFD, if they are available. First scavenge them into Params. 4736 SmallVector<ParmVarDecl*, 16> Params; 4737 if (D.isFunctionDeclarator()) { 4738 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4739 4740 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4741 // function that takes no arguments, not a function that takes a 4742 // single void argument. 4743 // We let through "const void" here because Sema::GetTypeForDeclarator 4744 // already checks for that case. 4745 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4746 FTI.ArgInfo[0].Param && 4747 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4748 // Empty arg list, don't push any params. 4749 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4750 4751 // In C++, the empty parameter-type-list must be spelled "void"; a 4752 // typedef of void is not permitted. 4753 if (getLangOptions().CPlusPlus && 4754 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4755 bool IsTypeAlias = false; 4756 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4757 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4758 else if (const TemplateSpecializationType *TST = 4759 Param->getType()->getAs<TemplateSpecializationType>()) 4760 IsTypeAlias = TST->isTypeAlias(); 4761 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4762 << IsTypeAlias; 4763 } 4764 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4765 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4766 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4767 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4768 Param->setDeclContext(NewFD); 4769 Params.push_back(Param); 4770 4771 if (Param->isInvalidDecl()) 4772 NewFD->setInvalidDecl(); 4773 } 4774 } 4775 4776 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4777 // When we're declaring a function with a typedef, typeof, etc as in the 4778 // following example, we'll need to synthesize (unnamed) 4779 // parameters for use in the declaration. 4780 // 4781 // @code 4782 // typedef void fn(int); 4783 // fn f; 4784 // @endcode 4785 4786 // Synthesize a parameter for each argument type. 4787 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4788 AE = FT->arg_type_end(); AI != AE; ++AI) { 4789 ParmVarDecl *Param = 4790 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4791 Param->setScopeInfo(0, Params.size()); 4792 Params.push_back(Param); 4793 } 4794 } else { 4795 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4796 "Should not need args for typedef of non-prototype fn"); 4797 } 4798 // Finally, we know we have the right number of parameters, install them. 4799 NewFD->setParams(Params.data(), Params.size()); 4800 4801 // Process the non-inheritable attributes on this declaration. 4802 ProcessDeclAttributes(S, NewFD, D, 4803 /*NonInheritable=*/true, /*Inheritable=*/false); 4804 4805 if (!getLangOptions().CPlusPlus) { 4806 // Perform semantic checking on the function declaration. 4807 bool isExplicitSpecialization=false; 4808 if (!NewFD->isInvalidDecl()) { 4809 if (NewFD->getResultType()->isVariablyModifiedType()) { 4810 // Functions returning a variably modified type violate C99 6.7.5.2p2 4811 // because all functions have linkage. 4812 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4813 NewFD->setInvalidDecl(); 4814 } else { 4815 if (NewFD->isMain()) 4816 CheckMain(NewFD, D.getDeclSpec()); 4817 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4818 Redeclaration); 4819 } 4820 } 4821 assert((NewFD->isInvalidDecl() || !Redeclaration || 4822 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4823 "previous declaration set still overloaded"); 4824 } else { 4825 // If the declarator is a template-id, translate the parser's template 4826 // argument list into our AST format. 4827 bool HasExplicitTemplateArgs = false; 4828 TemplateArgumentListInfo TemplateArgs; 4829 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4830 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4831 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4832 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4833 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4834 TemplateId->getTemplateArgs(), 4835 TemplateId->NumArgs); 4836 translateTemplateArguments(TemplateArgsPtr, 4837 TemplateArgs); 4838 TemplateArgsPtr.release(); 4839 4840 HasExplicitTemplateArgs = true; 4841 4842 if (NewFD->isInvalidDecl()) { 4843 HasExplicitTemplateArgs = false; 4844 } else if (FunctionTemplate) { 4845 // Function template with explicit template arguments. 4846 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4847 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4848 4849 HasExplicitTemplateArgs = false; 4850 } else if (!isFunctionTemplateSpecialization && 4851 !D.getDeclSpec().isFriendSpecified()) { 4852 // We have encountered something that the user meant to be a 4853 // specialization (because it has explicitly-specified template 4854 // arguments) but that was not introduced with a "template<>" (or had 4855 // too few of them). 4856 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4857 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4858 << FixItHint::CreateInsertion( 4859 D.getDeclSpec().getSourceRange().getBegin(), 4860 "template<> "); 4861 isFunctionTemplateSpecialization = true; 4862 } else { 4863 // "friend void foo<>(int);" is an implicit specialization decl. 4864 isFunctionTemplateSpecialization = true; 4865 } 4866 } else if (isFriend && isFunctionTemplateSpecialization) { 4867 // This combination is only possible in a recovery case; the user 4868 // wrote something like: 4869 // template <> friend void foo(int); 4870 // which we're recovering from as if the user had written: 4871 // friend void foo<>(int); 4872 // Go ahead and fake up a template id. 4873 HasExplicitTemplateArgs = true; 4874 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4875 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4876 } 4877 4878 // If it's a friend (and only if it's a friend), it's possible 4879 // that either the specialized function type or the specialized 4880 // template is dependent, and therefore matching will fail. In 4881 // this case, don't check the specialization yet. 4882 if (isFunctionTemplateSpecialization && isFriend && 4883 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4884 assert(HasExplicitTemplateArgs && 4885 "friend function specialization without template args"); 4886 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4887 Previous)) 4888 NewFD->setInvalidDecl(); 4889 } else if (isFunctionTemplateSpecialization) { 4890 if (CurContext->isDependentContext() && CurContext->isRecord() 4891 && !isFriend) { 4892 isDependentClassScopeExplicitSpecialization = true; 4893 Diag(NewFD->getLocation(), getLangOptions().Microsoft ? 4894 diag::ext_function_specialization_in_class : 4895 diag::err_function_specialization_in_class) 4896 << NewFD->getDeclName(); 4897 } else if (CheckFunctionTemplateSpecialization(NewFD, 4898 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 4899 Previous)) 4900 NewFD->setInvalidDecl(); 4901 4902 // C++ [dcl.stc]p1: 4903 // A storage-class-specifier shall not be specified in an explicit 4904 // specialization (14.7.3) 4905 if (SC != SC_None) { 4906 if (SC != NewFD->getStorageClass()) 4907 Diag(NewFD->getLocation(), 4908 diag::err_explicit_specialization_inconsistent_storage_class) 4909 << SC 4910 << FixItHint::CreateRemoval( 4911 D.getDeclSpec().getStorageClassSpecLoc()); 4912 4913 else 4914 Diag(NewFD->getLocation(), 4915 diag::ext_explicit_specialization_storage_class) 4916 << FixItHint::CreateRemoval( 4917 D.getDeclSpec().getStorageClassSpecLoc()); 4918 } 4919 4920 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 4921 if (CheckMemberSpecialization(NewFD, Previous)) 4922 NewFD->setInvalidDecl(); 4923 } 4924 4925 // Perform semantic checking on the function declaration. 4926 if (!isDependentClassScopeExplicitSpecialization) { 4927 if (NewFD->isInvalidDecl()) { 4928 // If this is a class member, mark the class invalid immediately. 4929 // This avoids some consistency errors later. 4930 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 4931 methodDecl->getParent()->setInvalidDecl(); 4932 } else { 4933 if (NewFD->isMain()) 4934 CheckMain(NewFD, D.getDeclSpec()); 4935 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4936 Redeclaration); 4937 } 4938 } 4939 4940 assert((NewFD->isInvalidDecl() || !Redeclaration || 4941 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4942 "previous declaration set still overloaded"); 4943 4944 NamedDecl *PrincipalDecl = (FunctionTemplate 4945 ? cast<NamedDecl>(FunctionTemplate) 4946 : NewFD); 4947 4948 if (isFriend && Redeclaration) { 4949 AccessSpecifier Access = AS_public; 4950 if (!NewFD->isInvalidDecl()) 4951 Access = NewFD->getPreviousDeclaration()->getAccess(); 4952 4953 NewFD->setAccess(Access); 4954 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 4955 4956 PrincipalDecl->setObjectOfFriendDecl(true); 4957 } 4958 4959 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 4960 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 4961 PrincipalDecl->setNonMemberOperator(); 4962 4963 // If we have a function template, check the template parameter 4964 // list. This will check and merge default template arguments. 4965 if (FunctionTemplate) { 4966 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 4967 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 4968 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 4969 D.getDeclSpec().isFriendSpecified() 4970 ? (IsFunctionDefinition 4971 ? TPC_FriendFunctionTemplateDefinition 4972 : TPC_FriendFunctionTemplate) 4973 : (D.getCXXScopeSpec().isSet() && 4974 DC && DC->isRecord() && 4975 DC->isDependentContext()) 4976 ? TPC_ClassTemplateMember 4977 : TPC_FunctionTemplate); 4978 } 4979 4980 if (NewFD->isInvalidDecl()) { 4981 // Ignore all the rest of this. 4982 } else if (!Redeclaration) { 4983 // Fake up an access specifier if it's supposed to be a class member. 4984 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 4985 NewFD->setAccess(AS_public); 4986 4987 // Qualified decls generally require a previous declaration. 4988 if (D.getCXXScopeSpec().isSet()) { 4989 // ...with the major exception of templated-scope or 4990 // dependent-scope friend declarations. 4991 4992 // TODO: we currently also suppress this check in dependent 4993 // contexts because (1) the parameter depth will be off when 4994 // matching friend templates and (2) we might actually be 4995 // selecting a friend based on a dependent factor. But there 4996 // are situations where these conditions don't apply and we 4997 // can actually do this check immediately. 4998 if (isFriend && 4999 (TemplateParamLists.size() || 5000 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5001 CurContext->isDependentContext())) { 5002 // ignore these 5003 } else { 5004 // The user tried to provide an out-of-line definition for a 5005 // function that is a member of a class or namespace, but there 5006 // was no such member function declared (C++ [class.mfct]p2, 5007 // C++ [namespace.memdef]p2). For example: 5008 // 5009 // class X { 5010 // void f() const; 5011 // }; 5012 // 5013 // void X::f() { } // ill-formed 5014 // 5015 // Complain about this problem, and attempt to suggest close 5016 // matches (e.g., those that differ only in cv-qualifiers and 5017 // whether the parameter types are references). 5018 5019 DiagnoseInvalidRedeclaration(*this, NewFD, false); 5020 } 5021 5022 // Unqualified local friend declarations are required to resolve 5023 // to something. 5024 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5025 DiagnoseInvalidRedeclaration(*this, NewFD, true); 5026 } 5027 5028 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 5029 !isFriend && !isFunctionTemplateSpecialization && 5030 !isExplicitSpecialization) { 5031 // An out-of-line member function declaration must also be a 5032 // definition (C++ [dcl.meaning]p1). 5033 // Note that this is not the case for explicit specializations of 5034 // function templates or member functions of class templates, per 5035 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5036 // for compatibility with old SWIG code which likes to generate them. 5037 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5038 << D.getCXXScopeSpec().getRange(); 5039 } 5040 } 5041 5042 5043 // Handle attributes. We need to have merged decls when handling attributes 5044 // (for example to check for conflicts, etc). 5045 // FIXME: This needs to happen before we merge declarations. Then, 5046 // let attribute merging cope with attribute conflicts. 5047 ProcessDeclAttributes(S, NewFD, D, 5048 /*NonInheritable=*/false, /*Inheritable=*/true); 5049 5050 // attributes declared post-definition are currently ignored 5051 // FIXME: This should happen during attribute merging 5052 if (Redeclaration && Previous.isSingleResult()) { 5053 const FunctionDecl *Def; 5054 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5055 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5056 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5057 Diag(Def->getLocation(), diag::note_previous_definition); 5058 } 5059 } 5060 5061 AddKnownFunctionAttributes(NewFD); 5062 5063 if (NewFD->hasAttr<OverloadableAttr>() && 5064 !NewFD->getType()->getAs<FunctionProtoType>()) { 5065 Diag(NewFD->getLocation(), 5066 diag::err_attribute_overloadable_no_prototype) 5067 << NewFD; 5068 5069 // Turn this into a variadic function with no parameters. 5070 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5071 FunctionProtoType::ExtProtoInfo EPI; 5072 EPI.Variadic = true; 5073 EPI.ExtInfo = FT->getExtInfo(); 5074 5075 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5076 NewFD->setType(R); 5077 } 5078 5079 // If there's a #pragma GCC visibility in scope, and this isn't a class 5080 // member, set the visibility of this function. 5081 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5082 AddPushedVisibilityAttribute(NewFD); 5083 5084 // If this is a locally-scoped extern C function, update the 5085 // map of such names. 5086 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5087 && !NewFD->isInvalidDecl()) 5088 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5089 5090 // Set this FunctionDecl's range up to the right paren. 5091 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5092 5093 if (getLangOptions().CPlusPlus) { 5094 if (FunctionTemplate) { 5095 if (NewFD->isInvalidDecl()) 5096 FunctionTemplate->setInvalidDecl(); 5097 return FunctionTemplate; 5098 } 5099 } 5100 5101 MarkUnusedFileScopedDecl(NewFD); 5102 5103 if (getLangOptions().CUDA) 5104 if (IdentifierInfo *II = NewFD->getIdentifier()) 5105 if (!NewFD->isInvalidDecl() && 5106 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5107 if (II->isStr("cudaConfigureCall")) { 5108 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5109 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5110 5111 Context.setcudaConfigureCallDecl(NewFD); 5112 } 5113 } 5114 5115 // Here we have an function template explicit specialization at class scope. 5116 // The actually specialization will be postponed to template instatiation 5117 // time via the ClassScopeFunctionSpecializationDecl node. 5118 if (isDependentClassScopeExplicitSpecialization) { 5119 ClassScopeFunctionSpecializationDecl *NewSpec = 5120 ClassScopeFunctionSpecializationDecl::Create( 5121 Context, CurContext, SourceLocation(), 5122 cast<CXXMethodDecl>(NewFD)); 5123 CurContext->addDecl(NewSpec); 5124 AddToScope = false; 5125 } 5126 5127 return NewFD; 5128} 5129 5130/// \brief Perform semantic checking of a new function declaration. 5131/// 5132/// Performs semantic analysis of the new function declaration 5133/// NewFD. This routine performs all semantic checking that does not 5134/// require the actual declarator involved in the declaration, and is 5135/// used both for the declaration of functions as they are parsed 5136/// (called via ActOnDeclarator) and for the declaration of functions 5137/// that have been instantiated via C++ template instantiation (called 5138/// via InstantiateDecl). 5139/// 5140/// \param IsExplicitSpecialiation whether this new function declaration is 5141/// an explicit specialization of the previous declaration. 5142/// 5143/// This sets NewFD->isInvalidDecl() to true if there was an error. 5144void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5145 LookupResult &Previous, 5146 bool IsExplicitSpecialization, 5147 bool &Redeclaration) { 5148 assert(!NewFD->getResultType()->isVariablyModifiedType() 5149 && "Variably modified return types are not handled here"); 5150 5151 // Check for a previous declaration of this name. 5152 if (Previous.empty() && NewFD->isExternC()) { 5153 // Since we did not find anything by this name and we're declaring 5154 // an extern "C" function, look for a non-visible extern "C" 5155 // declaration with the same name. 5156 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5157 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5158 if (Pos != LocallyScopedExternalDecls.end()) 5159 Previous.addDecl(Pos->second); 5160 } 5161 5162 // Merge or overload the declaration with an existing declaration of 5163 // the same name, if appropriate. 5164 if (!Previous.empty()) { 5165 // Determine whether NewFD is an overload of PrevDecl or 5166 // a declaration that requires merging. If it's an overload, 5167 // there's no more work to do here; we'll just add the new 5168 // function to the scope. 5169 5170 NamedDecl *OldDecl = 0; 5171 if (!AllowOverloadingOfFunction(Previous, Context)) { 5172 Redeclaration = true; 5173 OldDecl = Previous.getFoundDecl(); 5174 } else { 5175 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5176 /*NewIsUsingDecl*/ false)) { 5177 case Ovl_Match: 5178 Redeclaration = true; 5179 break; 5180 5181 case Ovl_NonFunction: 5182 Redeclaration = true; 5183 break; 5184 5185 case Ovl_Overload: 5186 Redeclaration = false; 5187 break; 5188 } 5189 5190 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5191 // If a function name is overloadable in C, then every function 5192 // with that name must be marked "overloadable". 5193 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5194 << Redeclaration << NewFD; 5195 NamedDecl *OverloadedDecl = 0; 5196 if (Redeclaration) 5197 OverloadedDecl = OldDecl; 5198 else if (!Previous.empty()) 5199 OverloadedDecl = Previous.getRepresentativeDecl(); 5200 if (OverloadedDecl) 5201 Diag(OverloadedDecl->getLocation(), 5202 diag::note_attribute_overloadable_prev_overload); 5203 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5204 Context)); 5205 } 5206 } 5207 5208 if (Redeclaration) { 5209 // NewFD and OldDecl represent declarations that need to be 5210 // merged. 5211 if (MergeFunctionDecl(NewFD, OldDecl)) 5212 return NewFD->setInvalidDecl(); 5213 5214 Previous.clear(); 5215 Previous.addDecl(OldDecl); 5216 5217 if (FunctionTemplateDecl *OldTemplateDecl 5218 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5219 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5220 FunctionTemplateDecl *NewTemplateDecl 5221 = NewFD->getDescribedFunctionTemplate(); 5222 assert(NewTemplateDecl && "Template/non-template mismatch"); 5223 if (CXXMethodDecl *Method 5224 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5225 Method->setAccess(OldTemplateDecl->getAccess()); 5226 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5227 } 5228 5229 // If this is an explicit specialization of a member that is a function 5230 // template, mark it as a member specialization. 5231 if (IsExplicitSpecialization && 5232 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5233 NewTemplateDecl->setMemberSpecialization(); 5234 assert(OldTemplateDecl->isMemberSpecialization()); 5235 } 5236 } else { 5237 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5238 NewFD->setAccess(OldDecl->getAccess()); 5239 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5240 } 5241 } 5242 } 5243 5244 // Semantic checking for this function declaration (in isolation). 5245 if (getLangOptions().CPlusPlus) { 5246 // C++-specific checks. 5247 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5248 CheckConstructor(Constructor); 5249 } else if (CXXDestructorDecl *Destructor = 5250 dyn_cast<CXXDestructorDecl>(NewFD)) { 5251 CXXRecordDecl *Record = Destructor->getParent(); 5252 QualType ClassType = Context.getTypeDeclType(Record); 5253 5254 // FIXME: Shouldn't we be able to perform this check even when the class 5255 // type is dependent? Both gcc and edg can handle that. 5256 if (!ClassType->isDependentType()) { 5257 DeclarationName Name 5258 = Context.DeclarationNames.getCXXDestructorName( 5259 Context.getCanonicalType(ClassType)); 5260 if (NewFD->getDeclName() != Name) { 5261 Diag(NewFD->getLocation(), diag::err_destructor_name); 5262 return NewFD->setInvalidDecl(); 5263 } 5264 } 5265 } else if (CXXConversionDecl *Conversion 5266 = dyn_cast<CXXConversionDecl>(NewFD)) { 5267 ActOnConversionDeclarator(Conversion); 5268 } 5269 5270 // Find any virtual functions that this function overrides. 5271 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5272 if (!Method->isFunctionTemplateSpecialization() && 5273 !Method->getDescribedFunctionTemplate()) { 5274 if (AddOverriddenMethods(Method->getParent(), Method)) { 5275 // If the function was marked as "static", we have a problem. 5276 if (NewFD->getStorageClass() == SC_Static) { 5277 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5278 << NewFD->getDeclName(); 5279 for (CXXMethodDecl::method_iterator 5280 Overridden = Method->begin_overridden_methods(), 5281 OverriddenEnd = Method->end_overridden_methods(); 5282 Overridden != OverriddenEnd; 5283 ++Overridden) { 5284 Diag((*Overridden)->getLocation(), 5285 diag::note_overridden_virtual_function); 5286 } 5287 } 5288 } 5289 } 5290 } 5291 5292 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5293 if (NewFD->isOverloadedOperator() && 5294 CheckOverloadedOperatorDeclaration(NewFD)) 5295 return NewFD->setInvalidDecl(); 5296 5297 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5298 if (NewFD->getLiteralIdentifier() && 5299 CheckLiteralOperatorDeclaration(NewFD)) 5300 return NewFD->setInvalidDecl(); 5301 5302 // In C++, check default arguments now that we have merged decls. Unless 5303 // the lexical context is the class, because in this case this is done 5304 // during delayed parsing anyway. 5305 if (!CurContext->isRecord()) 5306 CheckCXXDefaultArguments(NewFD); 5307 5308 // If this function declares a builtin function, check the type of this 5309 // declaration against the expected type for the builtin. 5310 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5311 ASTContext::GetBuiltinTypeError Error; 5312 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5313 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5314 // The type of this function differs from the type of the builtin, 5315 // so forget about the builtin entirely. 5316 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5317 } 5318 } 5319 } 5320} 5321 5322void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5323 // C++ [basic.start.main]p3: A program that declares main to be inline 5324 // or static is ill-formed. 5325 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5326 // shall not appear in a declaration of main. 5327 // static main is not an error under C99, but we should warn about it. 5328 if (FD->getStorageClass() == SC_Static) 5329 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5330 ? diag::err_static_main : diag::warn_static_main) 5331 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5332 if (FD->isInlineSpecified()) 5333 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5334 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5335 5336 QualType T = FD->getType(); 5337 assert(T->isFunctionType() && "function decl is not of function type"); 5338 const FunctionType* FT = T->getAs<FunctionType>(); 5339 5340 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5341 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5342 FD->setInvalidDecl(true); 5343 } 5344 5345 // Treat protoless main() as nullary. 5346 if (isa<FunctionNoProtoType>(FT)) return; 5347 5348 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5349 unsigned nparams = FTP->getNumArgs(); 5350 assert(FD->getNumParams() == nparams); 5351 5352 bool HasExtraParameters = (nparams > 3); 5353 5354 // Darwin passes an undocumented fourth argument of type char**. If 5355 // other platforms start sprouting these, the logic below will start 5356 // getting shifty. 5357 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5358 HasExtraParameters = false; 5359 5360 if (HasExtraParameters) { 5361 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5362 FD->setInvalidDecl(true); 5363 nparams = 3; 5364 } 5365 5366 // FIXME: a lot of the following diagnostics would be improved 5367 // if we had some location information about types. 5368 5369 QualType CharPP = 5370 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5371 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5372 5373 for (unsigned i = 0; i < nparams; ++i) { 5374 QualType AT = FTP->getArgType(i); 5375 5376 bool mismatch = true; 5377 5378 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5379 mismatch = false; 5380 else if (Expected[i] == CharPP) { 5381 // As an extension, the following forms are okay: 5382 // char const ** 5383 // char const * const * 5384 // char * const * 5385 5386 QualifierCollector qs; 5387 const PointerType* PT; 5388 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5389 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5390 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5391 qs.removeConst(); 5392 mismatch = !qs.empty(); 5393 } 5394 } 5395 5396 if (mismatch) { 5397 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5398 // TODO: suggest replacing given type with expected type 5399 FD->setInvalidDecl(true); 5400 } 5401 } 5402 5403 if (nparams == 1 && !FD->isInvalidDecl()) { 5404 Diag(FD->getLocation(), diag::warn_main_one_arg); 5405 } 5406 5407 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5408 Diag(FD->getLocation(), diag::err_main_template_decl); 5409 FD->setInvalidDecl(); 5410 } 5411} 5412 5413bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5414 // FIXME: Need strict checking. In C89, we need to check for 5415 // any assignment, increment, decrement, function-calls, or 5416 // commas outside of a sizeof. In C99, it's the same list, 5417 // except that the aforementioned are allowed in unevaluated 5418 // expressions. Everything else falls under the 5419 // "may accept other forms of constant expressions" exception. 5420 // (We never end up here for C++, so the constant expression 5421 // rules there don't matter.) 5422 if (Init->isConstantInitializer(Context, false)) 5423 return false; 5424 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5425 << Init->getSourceRange(); 5426 return true; 5427} 5428 5429namespace { 5430 // Visits an initialization expression to see if OrigDecl is evaluated in 5431 // its own initialization and throws a warning if it does. 5432 class SelfReferenceChecker 5433 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5434 Sema &S; 5435 Decl *OrigDecl; 5436 bool isRecordType; 5437 bool isPODType; 5438 5439 public: 5440 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5441 5442 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5443 S(S), OrigDecl(OrigDecl) { 5444 isPODType = false; 5445 isRecordType = false; 5446 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5447 isPODType = VD->getType().isPODType(S.Context); 5448 isRecordType = VD->getType()->isRecordType(); 5449 } 5450 } 5451 5452 void VisitExpr(Expr *E) { 5453 if (isa<ObjCMessageExpr>(*E)) return; 5454 if (isRecordType) { 5455 Expr *expr = E; 5456 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5457 ValueDecl *VD = ME->getMemberDecl(); 5458 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5459 expr = ME->getBase(); 5460 } 5461 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5462 HandleDeclRefExpr(DRE); 5463 return; 5464 } 5465 } 5466 Inherited::VisitExpr(E); 5467 } 5468 5469 void VisitMemberExpr(MemberExpr *E) { 5470 if (E->getType()->canDecayToPointerType()) return; 5471 if (isa<FieldDecl>(E->getMemberDecl())) 5472 if (DeclRefExpr *DRE 5473 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5474 HandleDeclRefExpr(DRE); 5475 return; 5476 } 5477 Inherited::VisitMemberExpr(E); 5478 } 5479 5480 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5481 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5482 (isRecordType && E->getCastKind() == CK_NoOp)) { 5483 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5484 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5485 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5486 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5487 HandleDeclRefExpr(DRE); 5488 return; 5489 } 5490 } 5491 Inherited::VisitImplicitCastExpr(E); 5492 } 5493 5494 void VisitUnaryOperator(UnaryOperator *E) { 5495 // For POD record types, addresses of its own members are well-defined. 5496 if (isRecordType && isPODType) return; 5497 Inherited::VisitUnaryOperator(E); 5498 } 5499 5500 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5501 Decl* ReferenceDecl = DRE->getDecl(); 5502 if (OrigDecl != ReferenceDecl) return; 5503 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5504 Sema::NotForRedeclaration); 5505 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5506 S.PDiag(diag::warn_uninit_self_reference_in_init) 5507 << Result.getLookupName() 5508 << OrigDecl->getLocation() 5509 << DRE->getSourceRange()); 5510 } 5511 }; 5512} 5513 5514/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5515void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5516 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5517} 5518 5519/// AddInitializerToDecl - Adds the initializer Init to the 5520/// declaration dcl. If DirectInit is true, this is C++ direct 5521/// initialization rather than copy initialization. 5522void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5523 bool DirectInit, bool TypeMayContainAuto) { 5524 // If there is no declaration, there was an error parsing it. Just ignore 5525 // the initializer. 5526 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5527 return; 5528 5529 // Check for self-references within variable initializers. 5530 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5531 // Variables declared within a function/method body are handled 5532 // by a dataflow analysis. 5533 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5534 CheckSelfReference(RealDecl, Init); 5535 } 5536 else { 5537 CheckSelfReference(RealDecl, Init); 5538 } 5539 5540 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5541 // With declarators parsed the way they are, the parser cannot 5542 // distinguish between a normal initializer and a pure-specifier. 5543 // Thus this grotesque test. 5544 IntegerLiteral *IL; 5545 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5546 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5547 CheckPureMethod(Method, Init->getSourceRange()); 5548 else { 5549 Diag(Method->getLocation(), diag::err_member_function_initialization) 5550 << Method->getDeclName() << Init->getSourceRange(); 5551 Method->setInvalidDecl(); 5552 } 5553 return; 5554 } 5555 5556 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5557 if (!VDecl) { 5558 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5559 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5560 RealDecl->setInvalidDecl(); 5561 return; 5562 } 5563 5564 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5565 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5566 TypeSourceInfo *DeducedType = 0; 5567 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5568 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5569 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5570 << Init->getSourceRange(); 5571 if (!DeducedType) { 5572 RealDecl->setInvalidDecl(); 5573 return; 5574 } 5575 VDecl->setTypeSourceInfo(DeducedType); 5576 VDecl->setType(DeducedType->getType()); 5577 5578 // In ARC, infer lifetime. 5579 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5580 VDecl->setInvalidDecl(); 5581 5582 // If this is a redeclaration, check that the type we just deduced matches 5583 // the previously declared type. 5584 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5585 MergeVarDeclTypes(VDecl, Old); 5586 } 5587 5588 5589 // A definition must end up with a complete type, which means it must be 5590 // complete with the restriction that an array type might be completed by the 5591 // initializer; note that later code assumes this restriction. 5592 QualType BaseDeclType = VDecl->getType(); 5593 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5594 BaseDeclType = Array->getElementType(); 5595 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5596 diag::err_typecheck_decl_incomplete_type)) { 5597 RealDecl->setInvalidDecl(); 5598 return; 5599 } 5600 5601 // The variable can not have an abstract class type. 5602 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5603 diag::err_abstract_type_in_decl, 5604 AbstractVariableType)) 5605 VDecl->setInvalidDecl(); 5606 5607 const VarDecl *Def; 5608 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5609 Diag(VDecl->getLocation(), diag::err_redefinition) 5610 << VDecl->getDeclName(); 5611 Diag(Def->getLocation(), diag::note_previous_definition); 5612 VDecl->setInvalidDecl(); 5613 return; 5614 } 5615 5616 const VarDecl* PrevInit = 0; 5617 if (getLangOptions().CPlusPlus) { 5618 // C++ [class.static.data]p4 5619 // If a static data member is of const integral or const 5620 // enumeration type, its declaration in the class definition can 5621 // specify a constant-initializer which shall be an integral 5622 // constant expression (5.19). In that case, the member can appear 5623 // in integral constant expressions. The member shall still be 5624 // defined in a namespace scope if it is used in the program and the 5625 // namespace scope definition shall not contain an initializer. 5626 // 5627 // We already performed a redefinition check above, but for static 5628 // data members we also need to check whether there was an in-class 5629 // declaration with an initializer. 5630 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5631 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5632 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5633 return; 5634 } 5635 5636 if (VDecl->hasLocalStorage()) 5637 getCurFunction()->setHasBranchProtectedScope(); 5638 5639 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5640 VDecl->setInvalidDecl(); 5641 return; 5642 } 5643 } 5644 5645 // Capture the variable that is being initialized and the style of 5646 // initialization. 5647 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5648 5649 // FIXME: Poor source location information. 5650 InitializationKind Kind 5651 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5652 Init->getLocStart(), 5653 Init->getLocEnd()) 5654 : InitializationKind::CreateCopy(VDecl->getLocation(), 5655 Init->getLocStart()); 5656 5657 // Get the decls type and save a reference for later, since 5658 // CheckInitializerTypes may change it. 5659 QualType DclT = VDecl->getType(), SavT = DclT; 5660 if (VDecl->isLocalVarDecl()) { 5661 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5662 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5663 VDecl->setInvalidDecl(); 5664 } else if (!VDecl->isInvalidDecl()) { 5665 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5666 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5667 MultiExprArg(*this, &Init, 1), 5668 &DclT); 5669 if (Result.isInvalid()) { 5670 VDecl->setInvalidDecl(); 5671 return; 5672 } 5673 5674 Init = Result.takeAs<Expr>(); 5675 5676 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5677 // Don't check invalid declarations to avoid emitting useless diagnostics. 5678 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5679 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5680 CheckForConstantInitializer(Init, DclT); 5681 } 5682 } 5683 } else if (VDecl->isStaticDataMember() && 5684 VDecl->getLexicalDeclContext()->isRecord()) { 5685 // This is an in-class initialization for a static data member, e.g., 5686 // 5687 // struct S { 5688 // static const int value = 17; 5689 // }; 5690 5691 // Try to perform the initialization regardless. 5692 if (!VDecl->isInvalidDecl()) { 5693 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5694 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5695 MultiExprArg(*this, &Init, 1), 5696 &DclT); 5697 if (Result.isInvalid()) { 5698 VDecl->setInvalidDecl(); 5699 return; 5700 } 5701 5702 Init = Result.takeAs<Expr>(); 5703 } 5704 5705 // C++ [class.mem]p4: 5706 // A member-declarator can contain a constant-initializer only 5707 // if it declares a static member (9.4) of const integral or 5708 // const enumeration type, see 9.4.2. 5709 QualType T = VDecl->getType(); 5710 5711 // Do nothing on dependent types. 5712 if (T->isDependentType()) { 5713 5714 // Require constness. 5715 } else if (!T.isConstQualified()) { 5716 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5717 << Init->getSourceRange(); 5718 VDecl->setInvalidDecl(); 5719 5720 // We allow integer constant expressions in all cases. 5721 } else if (T->isIntegralOrEnumerationType()) { 5722 // Check whether the expression is a constant expression. 5723 SourceLocation Loc; 5724 if (Init->isValueDependent()) 5725 ; // Nothing to check. 5726 else if (Init->isIntegerConstantExpr(Context, &Loc)) 5727 ; // Ok, it's an ICE! 5728 else if (Init->isEvaluatable(Context)) { 5729 // If we can constant fold the initializer through heroics, accept it, 5730 // but report this as a use of an extension for -pedantic. 5731 Diag(Loc, diag::ext_in_class_initializer_non_constant) 5732 << Init->getSourceRange(); 5733 } else { 5734 // Otherwise, this is some crazy unknown case. Report the issue at the 5735 // location provided by the isIntegerConstantExpr failed check. 5736 Diag(Loc, diag::err_in_class_initializer_non_constant) 5737 << Init->getSourceRange(); 5738 VDecl->setInvalidDecl(); 5739 } 5740 5741 // We allow floating-point constants as an extension in C++03, and 5742 // C++0x has far more complicated rules that we don't really 5743 // implement fully. 5744 } else { 5745 bool Allowed = false; 5746 if (getLangOptions().CPlusPlus0x) { 5747 Allowed = T->isLiteralType(); 5748 } else if (T->isFloatingType()) { // also permits complex, which is ok 5749 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5750 << T << Init->getSourceRange(); 5751 Allowed = true; 5752 } 5753 5754 if (!Allowed) { 5755 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5756 << T << Init->getSourceRange(); 5757 VDecl->setInvalidDecl(); 5758 5759 // TODO: there are probably expressions that pass here that shouldn't. 5760 } else if (!Init->isValueDependent() && 5761 !Init->isConstantInitializer(Context, false)) { 5762 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5763 << Init->getSourceRange(); 5764 VDecl->setInvalidDecl(); 5765 } 5766 } 5767 } else if (VDecl->isFileVarDecl()) { 5768 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5769 (!getLangOptions().CPlusPlus || 5770 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5771 Diag(VDecl->getLocation(), diag::warn_extern_init); 5772 if (!VDecl->isInvalidDecl()) { 5773 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5774 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5775 MultiExprArg(*this, &Init, 1), 5776 &DclT); 5777 if (Result.isInvalid()) { 5778 VDecl->setInvalidDecl(); 5779 return; 5780 } 5781 5782 Init = Result.takeAs<Expr>(); 5783 } 5784 5785 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5786 // Don't check invalid declarations to avoid emitting useless diagnostics. 5787 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5788 // C99 6.7.8p4. All file scoped initializers need to be constant. 5789 CheckForConstantInitializer(Init, DclT); 5790 } 5791 } 5792 // If the type changed, it means we had an incomplete type that was 5793 // completed by the initializer. For example: 5794 // int ary[] = { 1, 3, 5 }; 5795 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5796 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5797 VDecl->setType(DclT); 5798 Init->setType(DclT); 5799 } 5800 5801 // Check any implicit conversions within the expression. 5802 CheckImplicitConversions(Init, VDecl->getLocation()); 5803 5804 if (!VDecl->isInvalidDecl()) 5805 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 5806 5807 Init = MaybeCreateExprWithCleanups(Init); 5808 // Attach the initializer to the decl. 5809 VDecl->setInit(Init); 5810 5811 CheckCompleteVariableDeclaration(VDecl); 5812} 5813 5814/// ActOnInitializerError - Given that there was an error parsing an 5815/// initializer for the given declaration, try to return to some form 5816/// of sanity. 5817void Sema::ActOnInitializerError(Decl *D) { 5818 // Our main concern here is re-establishing invariants like "a 5819 // variable's type is either dependent or complete". 5820 if (!D || D->isInvalidDecl()) return; 5821 5822 VarDecl *VD = dyn_cast<VarDecl>(D); 5823 if (!VD) return; 5824 5825 // Auto types are meaningless if we can't make sense of the initializer. 5826 if (ParsingInitForAutoVars.count(D)) { 5827 D->setInvalidDecl(); 5828 return; 5829 } 5830 5831 QualType Ty = VD->getType(); 5832 if (Ty->isDependentType()) return; 5833 5834 // Require a complete type. 5835 if (RequireCompleteType(VD->getLocation(), 5836 Context.getBaseElementType(Ty), 5837 diag::err_typecheck_decl_incomplete_type)) { 5838 VD->setInvalidDecl(); 5839 return; 5840 } 5841 5842 // Require an abstract type. 5843 if (RequireNonAbstractType(VD->getLocation(), Ty, 5844 diag::err_abstract_type_in_decl, 5845 AbstractVariableType)) { 5846 VD->setInvalidDecl(); 5847 return; 5848 } 5849 5850 // Don't bother complaining about constructors or destructors, 5851 // though. 5852} 5853 5854void Sema::ActOnUninitializedDecl(Decl *RealDecl, 5855 bool TypeMayContainAuto) { 5856 // If there is no declaration, there was an error parsing it. Just ignore it. 5857 if (RealDecl == 0) 5858 return; 5859 5860 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 5861 QualType Type = Var->getType(); 5862 5863 // C++0x [dcl.spec.auto]p3 5864 if (TypeMayContainAuto && Type->getContainedAutoType()) { 5865 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 5866 << Var->getDeclName() << Type; 5867 Var->setInvalidDecl(); 5868 return; 5869 } 5870 5871 switch (Var->isThisDeclarationADefinition()) { 5872 case VarDecl::Definition: 5873 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 5874 break; 5875 5876 // We have an out-of-line definition of a static data member 5877 // that has an in-class initializer, so we type-check this like 5878 // a declaration. 5879 // 5880 // Fall through 5881 5882 case VarDecl::DeclarationOnly: 5883 // It's only a declaration. 5884 5885 // Block scope. C99 6.7p7: If an identifier for an object is 5886 // declared with no linkage (C99 6.2.2p6), the type for the 5887 // object shall be complete. 5888 if (!Type->isDependentType() && Var->isLocalVarDecl() && 5889 !Var->getLinkage() && !Var->isInvalidDecl() && 5890 RequireCompleteType(Var->getLocation(), Type, 5891 diag::err_typecheck_decl_incomplete_type)) 5892 Var->setInvalidDecl(); 5893 5894 // Make sure that the type is not abstract. 5895 if (!Type->isDependentType() && !Var->isInvalidDecl() && 5896 RequireNonAbstractType(Var->getLocation(), Type, 5897 diag::err_abstract_type_in_decl, 5898 AbstractVariableType)) 5899 Var->setInvalidDecl(); 5900 return; 5901 5902 case VarDecl::TentativeDefinition: 5903 // File scope. C99 6.9.2p2: A declaration of an identifier for an 5904 // object that has file scope without an initializer, and without a 5905 // storage-class specifier or with the storage-class specifier "static", 5906 // constitutes a tentative definition. Note: A tentative definition with 5907 // external linkage is valid (C99 6.2.2p5). 5908 if (!Var->isInvalidDecl()) { 5909 if (const IncompleteArrayType *ArrayT 5910 = Context.getAsIncompleteArrayType(Type)) { 5911 if (RequireCompleteType(Var->getLocation(), 5912 ArrayT->getElementType(), 5913 diag::err_illegal_decl_array_incomplete_type)) 5914 Var->setInvalidDecl(); 5915 } else if (Var->getStorageClass() == SC_Static) { 5916 // C99 6.9.2p3: If the declaration of an identifier for an object is 5917 // a tentative definition and has internal linkage (C99 6.2.2p3), the 5918 // declared type shall not be an incomplete type. 5919 // NOTE: code such as the following 5920 // static struct s; 5921 // struct s { int a; }; 5922 // is accepted by gcc. Hence here we issue a warning instead of 5923 // an error and we do not invalidate the static declaration. 5924 // NOTE: to avoid multiple warnings, only check the first declaration. 5925 if (Var->getPreviousDeclaration() == 0) 5926 RequireCompleteType(Var->getLocation(), Type, 5927 diag::ext_typecheck_decl_incomplete_type); 5928 } 5929 } 5930 5931 // Record the tentative definition; we're done. 5932 if (!Var->isInvalidDecl()) 5933 TentativeDefinitions.push_back(Var); 5934 return; 5935 } 5936 5937 // Provide a specific diagnostic for uninitialized variable 5938 // definitions with incomplete array type. 5939 if (Type->isIncompleteArrayType()) { 5940 Diag(Var->getLocation(), 5941 diag::err_typecheck_incomplete_array_needs_initializer); 5942 Var->setInvalidDecl(); 5943 return; 5944 } 5945 5946 // Provide a specific diagnostic for uninitialized variable 5947 // definitions with reference type. 5948 if (Type->isReferenceType()) { 5949 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 5950 << Var->getDeclName() 5951 << SourceRange(Var->getLocation(), Var->getLocation()); 5952 Var->setInvalidDecl(); 5953 return; 5954 } 5955 5956 // Do not attempt to type-check the default initializer for a 5957 // variable with dependent type. 5958 if (Type->isDependentType()) 5959 return; 5960 5961 if (Var->isInvalidDecl()) 5962 return; 5963 5964 if (RequireCompleteType(Var->getLocation(), 5965 Context.getBaseElementType(Type), 5966 diag::err_typecheck_decl_incomplete_type)) { 5967 Var->setInvalidDecl(); 5968 return; 5969 } 5970 5971 // The variable can not have an abstract class type. 5972 if (RequireNonAbstractType(Var->getLocation(), Type, 5973 diag::err_abstract_type_in_decl, 5974 AbstractVariableType)) { 5975 Var->setInvalidDecl(); 5976 return; 5977 } 5978 5979 // Check for jumps past the implicit initializer. C++0x 5980 // clarifies that this applies to a "variable with automatic 5981 // storage duration", not a "local variable". 5982 // C++0x [stmt.dcl]p3 5983 // A program that jumps from a point where a variable with automatic 5984 // storage duration is not in scope to a point where it is in scope is 5985 // ill-formed unless the variable has scalar type, class type with a 5986 // trivial default constructor and a trivial destructor, a cv-qualified 5987 // version of one of these types, or an array of one of the preceding 5988 // types and is declared without an initializer. 5989 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 5990 if (const RecordType *Record 5991 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 5992 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 5993 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 5994 (getLangOptions().CPlusPlus0x && 5995 (!CXXRecord->hasTrivialDefaultConstructor() || 5996 !CXXRecord->hasTrivialDestructor()))) 5997 getCurFunction()->setHasBranchProtectedScope(); 5998 } 5999 } 6000 6001 // C++03 [dcl.init]p9: 6002 // If no initializer is specified for an object, and the 6003 // object is of (possibly cv-qualified) non-POD class type (or 6004 // array thereof), the object shall be default-initialized; if 6005 // the object is of const-qualified type, the underlying class 6006 // type shall have a user-declared default 6007 // constructor. Otherwise, if no initializer is specified for 6008 // a non- static object, the object and its subobjects, if 6009 // any, have an indeterminate initial value); if the object 6010 // or any of its subobjects are of const-qualified type, the 6011 // program is ill-formed. 6012 // C++0x [dcl.init]p11: 6013 // If no initializer is specified for an object, the object is 6014 // default-initialized; [...]. 6015 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6016 InitializationKind Kind 6017 = InitializationKind::CreateDefault(Var->getLocation()); 6018 6019 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6020 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6021 MultiExprArg(*this, 0, 0)); 6022 if (Init.isInvalid()) 6023 Var->setInvalidDecl(); 6024 else if (Init.get()) 6025 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6026 6027 CheckCompleteVariableDeclaration(Var); 6028 } 6029} 6030 6031void Sema::ActOnCXXForRangeDecl(Decl *D) { 6032 VarDecl *VD = dyn_cast<VarDecl>(D); 6033 if (!VD) { 6034 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6035 D->setInvalidDecl(); 6036 return; 6037 } 6038 6039 VD->setCXXForRangeDecl(true); 6040 6041 // for-range-declaration cannot be given a storage class specifier. 6042 int Error = -1; 6043 switch (VD->getStorageClassAsWritten()) { 6044 case SC_None: 6045 break; 6046 case SC_Extern: 6047 Error = 0; 6048 break; 6049 case SC_Static: 6050 Error = 1; 6051 break; 6052 case SC_PrivateExtern: 6053 Error = 2; 6054 break; 6055 case SC_Auto: 6056 Error = 3; 6057 break; 6058 case SC_Register: 6059 Error = 4; 6060 break; 6061 } 6062 // FIXME: constexpr isn't allowed here. 6063 //if (DS.isConstexprSpecified()) 6064 // Error = 5; 6065 if (Error != -1) { 6066 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6067 << VD->getDeclName() << Error; 6068 D->setInvalidDecl(); 6069 } 6070} 6071 6072void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6073 if (var->isInvalidDecl()) return; 6074 6075 // In ARC, don't allow jumps past the implicit initialization of a 6076 // local retaining variable. 6077 if (getLangOptions().ObjCAutoRefCount && 6078 var->hasLocalStorage()) { 6079 switch (var->getType().getObjCLifetime()) { 6080 case Qualifiers::OCL_None: 6081 case Qualifiers::OCL_ExplicitNone: 6082 case Qualifiers::OCL_Autoreleasing: 6083 break; 6084 6085 case Qualifiers::OCL_Weak: 6086 case Qualifiers::OCL_Strong: 6087 getCurFunction()->setHasBranchProtectedScope(); 6088 break; 6089 } 6090 } 6091 6092 // All the following checks are C++ only. 6093 if (!getLangOptions().CPlusPlus) return; 6094 6095 QualType baseType = Context.getBaseElementType(var->getType()); 6096 if (baseType->isDependentType()) return; 6097 6098 // __block variables might require us to capture a copy-initializer. 6099 if (var->hasAttr<BlocksAttr>()) { 6100 // It's currently invalid to ever have a __block variable with an 6101 // array type; should we diagnose that here? 6102 6103 // Regardless, we don't want to ignore array nesting when 6104 // constructing this copy. 6105 QualType type = var->getType(); 6106 6107 if (type->isStructureOrClassType()) { 6108 SourceLocation poi = var->getLocation(); 6109 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6110 ExprResult result = 6111 PerformCopyInitialization( 6112 InitializedEntity::InitializeBlock(poi, type, false), 6113 poi, Owned(varRef)); 6114 if (!result.isInvalid()) { 6115 result = MaybeCreateExprWithCleanups(result); 6116 Expr *init = result.takeAs<Expr>(); 6117 Context.setBlockVarCopyInits(var, init); 6118 } 6119 } 6120 } 6121 6122 // Check for global constructors. 6123 if (!var->getDeclContext()->isDependentContext() && 6124 var->hasGlobalStorage() && 6125 !var->isStaticLocal() && 6126 var->getInit() && 6127 !var->getInit()->isConstantInitializer(Context, 6128 baseType->isReferenceType())) 6129 Diag(var->getLocation(), diag::warn_global_constructor) 6130 << var->getInit()->getSourceRange(); 6131 6132 // Require the destructor. 6133 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6134 FinalizeVarWithDestructor(var, recordType); 6135} 6136 6137/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6138/// any semantic actions necessary after any initializer has been attached. 6139void 6140Sema::FinalizeDeclaration(Decl *ThisDecl) { 6141 // Note that we are no longer parsing the initializer for this declaration. 6142 ParsingInitForAutoVars.erase(ThisDecl); 6143} 6144 6145Sema::DeclGroupPtrTy 6146Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6147 Decl **Group, unsigned NumDecls) { 6148 SmallVector<Decl*, 8> Decls; 6149 6150 if (DS.isTypeSpecOwned()) 6151 Decls.push_back(DS.getRepAsDecl()); 6152 6153 for (unsigned i = 0; i != NumDecls; ++i) 6154 if (Decl *D = Group[i]) 6155 Decls.push_back(D); 6156 6157 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6158 DS.getTypeSpecType() == DeclSpec::TST_auto); 6159} 6160 6161/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6162/// group, performing any necessary semantic checking. 6163Sema::DeclGroupPtrTy 6164Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6165 bool TypeMayContainAuto) { 6166 // C++0x [dcl.spec.auto]p7: 6167 // If the type deduced for the template parameter U is not the same in each 6168 // deduction, the program is ill-formed. 6169 // FIXME: When initializer-list support is added, a distinction is needed 6170 // between the deduced type U and the deduced type which 'auto' stands for. 6171 // auto a = 0, b = { 1, 2, 3 }; 6172 // is legal because the deduced type U is 'int' in both cases. 6173 if (TypeMayContainAuto && NumDecls > 1) { 6174 QualType Deduced; 6175 CanQualType DeducedCanon; 6176 VarDecl *DeducedDecl = 0; 6177 for (unsigned i = 0; i != NumDecls; ++i) { 6178 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6179 AutoType *AT = D->getType()->getContainedAutoType(); 6180 // Don't reissue diagnostics when instantiating a template. 6181 if (AT && D->isInvalidDecl()) 6182 break; 6183 if (AT && AT->isDeduced()) { 6184 QualType U = AT->getDeducedType(); 6185 CanQualType UCanon = Context.getCanonicalType(U); 6186 if (Deduced.isNull()) { 6187 Deduced = U; 6188 DeducedCanon = UCanon; 6189 DeducedDecl = D; 6190 } else if (DeducedCanon != UCanon) { 6191 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6192 diag::err_auto_different_deductions) 6193 << Deduced << DeducedDecl->getDeclName() 6194 << U << D->getDeclName() 6195 << DeducedDecl->getInit()->getSourceRange() 6196 << D->getInit()->getSourceRange(); 6197 D->setInvalidDecl(); 6198 break; 6199 } 6200 } 6201 } 6202 } 6203 } 6204 6205 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6206} 6207 6208 6209/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6210/// to introduce parameters into function prototype scope. 6211Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6212 const DeclSpec &DS = D.getDeclSpec(); 6213 6214 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6215 VarDecl::StorageClass StorageClass = SC_None; 6216 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6217 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6218 StorageClass = SC_Register; 6219 StorageClassAsWritten = SC_Register; 6220 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6221 Diag(DS.getStorageClassSpecLoc(), 6222 diag::err_invalid_storage_class_in_func_decl); 6223 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6224 } 6225 6226 if (D.getDeclSpec().isThreadSpecified()) 6227 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6228 if (D.getDeclSpec().isConstexprSpecified()) 6229 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6230 << 0; 6231 6232 DiagnoseFunctionSpecifiers(D); 6233 6234 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6235 QualType parmDeclType = TInfo->getType(); 6236 6237 if (getLangOptions().CPlusPlus) { 6238 // Check that there are no default arguments inside the type of this 6239 // parameter. 6240 CheckExtraCXXDefaultArguments(D); 6241 6242 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6243 if (D.getCXXScopeSpec().isSet()) { 6244 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6245 << D.getCXXScopeSpec().getRange(); 6246 D.getCXXScopeSpec().clear(); 6247 } 6248 } 6249 6250 // Ensure we have a valid name 6251 IdentifierInfo *II = 0; 6252 if (D.hasName()) { 6253 II = D.getIdentifier(); 6254 if (!II) { 6255 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6256 << GetNameForDeclarator(D).getName().getAsString(); 6257 D.setInvalidType(true); 6258 } 6259 } 6260 6261 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6262 if (II) { 6263 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6264 ForRedeclaration); 6265 LookupName(R, S); 6266 if (R.isSingleResult()) { 6267 NamedDecl *PrevDecl = R.getFoundDecl(); 6268 if (PrevDecl->isTemplateParameter()) { 6269 // Maybe we will complain about the shadowed template parameter. 6270 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6271 // Just pretend that we didn't see the previous declaration. 6272 PrevDecl = 0; 6273 } else if (S->isDeclScope(PrevDecl)) { 6274 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6275 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6276 6277 // Recover by removing the name 6278 II = 0; 6279 D.SetIdentifier(0, D.getIdentifierLoc()); 6280 D.setInvalidType(true); 6281 } 6282 } 6283 } 6284 6285 // Temporarily put parameter variables in the translation unit, not 6286 // the enclosing context. This prevents them from accidentally 6287 // looking like class members in C++. 6288 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6289 D.getSourceRange().getBegin(), 6290 D.getIdentifierLoc(), II, 6291 parmDeclType, TInfo, 6292 StorageClass, StorageClassAsWritten); 6293 6294 if (D.isInvalidType()) 6295 New->setInvalidDecl(); 6296 6297 assert(S->isFunctionPrototypeScope()); 6298 assert(S->getFunctionPrototypeDepth() >= 1); 6299 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6300 S->getNextFunctionPrototypeIndex()); 6301 6302 // Add the parameter declaration into this scope. 6303 S->AddDecl(New); 6304 if (II) 6305 IdResolver.AddDecl(New); 6306 6307 ProcessDeclAttributes(S, New, D); 6308 6309 if (New->hasAttr<BlocksAttr>()) { 6310 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6311 } 6312 return New; 6313} 6314 6315/// \brief Synthesizes a variable for a parameter arising from a 6316/// typedef. 6317ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6318 SourceLocation Loc, 6319 QualType T) { 6320 /* FIXME: setting StartLoc == Loc. 6321 Would it be worth to modify callers so as to provide proper source 6322 location for the unnamed parameters, embedding the parameter's type? */ 6323 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6324 T, Context.getTrivialTypeSourceInfo(T, Loc), 6325 SC_None, SC_None, 0); 6326 Param->setImplicit(); 6327 return Param; 6328} 6329 6330void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6331 ParmVarDecl * const *ParamEnd) { 6332 // Don't diagnose unused-parameter errors in template instantiations; we 6333 // will already have done so in the template itself. 6334 if (!ActiveTemplateInstantiations.empty()) 6335 return; 6336 6337 for (; Param != ParamEnd; ++Param) { 6338 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6339 !(*Param)->hasAttr<UnusedAttr>()) { 6340 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6341 << (*Param)->getDeclName(); 6342 } 6343 } 6344} 6345 6346void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6347 ParmVarDecl * const *ParamEnd, 6348 QualType ReturnTy, 6349 NamedDecl *D) { 6350 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6351 return; 6352 6353 // Warn if the return value is pass-by-value and larger than the specified 6354 // threshold. 6355 if (ReturnTy.isPODType(Context)) { 6356 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6357 if (Size > LangOpts.NumLargeByValueCopy) 6358 Diag(D->getLocation(), diag::warn_return_value_size) 6359 << D->getDeclName() << Size; 6360 } 6361 6362 // Warn if any parameter is pass-by-value and larger than the specified 6363 // threshold. 6364 for (; Param != ParamEnd; ++Param) { 6365 QualType T = (*Param)->getType(); 6366 if (!T.isPODType(Context)) 6367 continue; 6368 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6369 if (Size > LangOpts.NumLargeByValueCopy) 6370 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6371 << (*Param)->getDeclName() << Size; 6372 } 6373} 6374 6375ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6376 SourceLocation NameLoc, IdentifierInfo *Name, 6377 QualType T, TypeSourceInfo *TSInfo, 6378 VarDecl::StorageClass StorageClass, 6379 VarDecl::StorageClass StorageClassAsWritten) { 6380 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6381 if (getLangOptions().ObjCAutoRefCount && 6382 T.getObjCLifetime() == Qualifiers::OCL_None && 6383 T->isObjCLifetimeType()) { 6384 6385 Qualifiers::ObjCLifetime lifetime; 6386 6387 // Special cases for arrays: 6388 // - if it's const, use __unsafe_unretained 6389 // - otherwise, it's an error 6390 if (T->isArrayType()) { 6391 if (!T.isConstQualified()) { 6392 Diag(NameLoc, diag::err_arc_array_param_no_ownership) 6393 << TSInfo->getTypeLoc().getSourceRange(); 6394 } 6395 lifetime = Qualifiers::OCL_ExplicitNone; 6396 } else { 6397 lifetime = T->getObjCARCImplicitLifetime(); 6398 } 6399 T = Context.getLifetimeQualifiedType(T, lifetime); 6400 } 6401 6402 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6403 Context.getAdjustedParameterType(T), 6404 TSInfo, 6405 StorageClass, StorageClassAsWritten, 6406 0); 6407 6408 // Parameters can not be abstract class types. 6409 // For record types, this is done by the AbstractClassUsageDiagnoser once 6410 // the class has been completely parsed. 6411 if (!CurContext->isRecord() && 6412 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6413 AbstractParamType)) 6414 New->setInvalidDecl(); 6415 6416 // Parameter declarators cannot be interface types. All ObjC objects are 6417 // passed by reference. 6418 if (T->isObjCObjectType()) { 6419 Diag(NameLoc, 6420 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6421 << FixItHint::CreateInsertion(NameLoc, "*"); 6422 T = Context.getObjCObjectPointerType(T); 6423 New->setType(T); 6424 } 6425 6426 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6427 // duration shall not be qualified by an address-space qualifier." 6428 // Since all parameters have automatic store duration, they can not have 6429 // an address space. 6430 if (T.getAddressSpace() != 0) { 6431 Diag(NameLoc, diag::err_arg_with_address_space); 6432 New->setInvalidDecl(); 6433 } 6434 6435 return New; 6436} 6437 6438void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6439 SourceLocation LocAfterDecls) { 6440 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6441 6442 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6443 // for a K&R function. 6444 if (!FTI.hasPrototype) { 6445 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6446 --i; 6447 if (FTI.ArgInfo[i].Param == 0) { 6448 llvm::SmallString<256> Code; 6449 llvm::raw_svector_ostream(Code) << " int " 6450 << FTI.ArgInfo[i].Ident->getName() 6451 << ";\n"; 6452 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6453 << FTI.ArgInfo[i].Ident 6454 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6455 6456 // Implicitly declare the argument as type 'int' for lack of a better 6457 // type. 6458 AttributeFactory attrs; 6459 DeclSpec DS(attrs); 6460 const char* PrevSpec; // unused 6461 unsigned DiagID; // unused 6462 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6463 PrevSpec, DiagID); 6464 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6465 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6466 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6467 } 6468 } 6469 } 6470} 6471 6472Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6473 Declarator &D) { 6474 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6475 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6476 Scope *ParentScope = FnBodyScope->getParent(); 6477 6478 Decl *DP = HandleDeclarator(ParentScope, D, 6479 MultiTemplateParamsArg(*this), 6480 /*IsFunctionDefinition=*/true); 6481 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6482} 6483 6484static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6485 // Don't warn about invalid declarations. 6486 if (FD->isInvalidDecl()) 6487 return false; 6488 6489 // Or declarations that aren't global. 6490 if (!FD->isGlobal()) 6491 return false; 6492 6493 // Don't warn about C++ member functions. 6494 if (isa<CXXMethodDecl>(FD)) 6495 return false; 6496 6497 // Don't warn about 'main'. 6498 if (FD->isMain()) 6499 return false; 6500 6501 // Don't warn about inline functions. 6502 if (FD->isInlined()) 6503 return false; 6504 6505 // Don't warn about function templates. 6506 if (FD->getDescribedFunctionTemplate()) 6507 return false; 6508 6509 // Don't warn about function template specializations. 6510 if (FD->isFunctionTemplateSpecialization()) 6511 return false; 6512 6513 bool MissingPrototype = true; 6514 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6515 Prev; Prev = Prev->getPreviousDeclaration()) { 6516 // Ignore any declarations that occur in function or method 6517 // scope, because they aren't visible from the header. 6518 if (Prev->getDeclContext()->isFunctionOrMethod()) 6519 continue; 6520 6521 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6522 break; 6523 } 6524 6525 return MissingPrototype; 6526} 6527 6528void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6529 // Don't complain if we're in GNU89 mode and the previous definition 6530 // was an extern inline function. 6531 const FunctionDecl *Definition; 6532 if (FD->isDefined(Definition) && 6533 !canRedefineFunction(Definition, getLangOptions())) { 6534 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6535 Definition->getStorageClass() == SC_Extern) 6536 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6537 << FD->getDeclName() << getLangOptions().CPlusPlus; 6538 else 6539 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6540 Diag(Definition->getLocation(), diag::note_previous_definition); 6541 } 6542} 6543 6544Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6545 // Clear the last template instantiation error context. 6546 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6547 6548 if (!D) 6549 return D; 6550 FunctionDecl *FD = 0; 6551 6552 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6553 FD = FunTmpl->getTemplatedDecl(); 6554 else 6555 FD = cast<FunctionDecl>(D); 6556 6557 // Enter a new function scope 6558 PushFunctionScope(); 6559 6560 // See if this is a redefinition. 6561 if (!FD->isLateTemplateParsed()) 6562 CheckForFunctionRedefinition(FD); 6563 6564 // Builtin functions cannot be defined. 6565 if (unsigned BuiltinID = FD->getBuiltinID()) { 6566 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6567 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6568 FD->setInvalidDecl(); 6569 } 6570 } 6571 6572 // The return type of a function definition must be complete 6573 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6574 QualType ResultType = FD->getResultType(); 6575 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6576 !FD->isInvalidDecl() && 6577 RequireCompleteType(FD->getLocation(), ResultType, 6578 diag::err_func_def_incomplete_result)) 6579 FD->setInvalidDecl(); 6580 6581 // GNU warning -Wmissing-prototypes: 6582 // Warn if a global function is defined without a previous 6583 // prototype declaration. This warning is issued even if the 6584 // definition itself provides a prototype. The aim is to detect 6585 // global functions that fail to be declared in header files. 6586 if (ShouldWarnAboutMissingPrototype(FD)) 6587 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6588 6589 if (FnBodyScope) 6590 PushDeclContext(FnBodyScope, FD); 6591 6592 // Check the validity of our function parameters 6593 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6594 /*CheckParameterNames=*/true); 6595 6596 // Introduce our parameters into the function scope 6597 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6598 ParmVarDecl *Param = FD->getParamDecl(p); 6599 Param->setOwningFunction(FD); 6600 6601 // If this has an identifier, add it to the scope stack. 6602 if (Param->getIdentifier() && FnBodyScope) { 6603 CheckShadow(FnBodyScope, Param); 6604 6605 PushOnScopeChains(Param, FnBodyScope); 6606 } 6607 } 6608 6609 // Checking attributes of current function definition 6610 // dllimport attribute. 6611 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6612 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6613 // dllimport attribute cannot be directly applied to definition. 6614 // Microsoft accepts dllimport for functions defined within class scope. 6615 if (!DA->isInherited() && 6616 !(LangOpts.Microsoft && FD->getLexicalDeclContext()->isRecord())) { 6617 Diag(FD->getLocation(), 6618 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6619 << "dllimport"; 6620 FD->setInvalidDecl(); 6621 return FD; 6622 } 6623 6624 // Visual C++ appears to not think this is an issue, so only issue 6625 // a warning when Microsoft extensions are disabled. 6626 if (!LangOpts.Microsoft) { 6627 // If a symbol previously declared dllimport is later defined, the 6628 // attribute is ignored in subsequent references, and a warning is 6629 // emitted. 6630 Diag(FD->getLocation(), 6631 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6632 << FD->getName() << "dllimport"; 6633 } 6634 } 6635 return FD; 6636} 6637 6638/// \brief Given the set of return statements within a function body, 6639/// compute the variables that are subject to the named return value 6640/// optimization. 6641/// 6642/// Each of the variables that is subject to the named return value 6643/// optimization will be marked as NRVO variables in the AST, and any 6644/// return statement that has a marked NRVO variable as its NRVO candidate can 6645/// use the named return value optimization. 6646/// 6647/// This function applies a very simplistic algorithm for NRVO: if every return 6648/// statement in the function has the same NRVO candidate, that candidate is 6649/// the NRVO variable. 6650/// 6651/// FIXME: Employ a smarter algorithm that accounts for multiple return 6652/// statements and the lifetimes of the NRVO candidates. We should be able to 6653/// find a maximal set of NRVO variables. 6654void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6655 ReturnStmt **Returns = Scope->Returns.data(); 6656 6657 const VarDecl *NRVOCandidate = 0; 6658 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6659 if (!Returns[I]->getNRVOCandidate()) 6660 return; 6661 6662 if (!NRVOCandidate) 6663 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6664 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6665 return; 6666 } 6667 6668 if (NRVOCandidate) 6669 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6670} 6671 6672Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6673 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6674} 6675 6676Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6677 bool IsInstantiation) { 6678 FunctionDecl *FD = 0; 6679 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6680 if (FunTmpl) 6681 FD = FunTmpl->getTemplatedDecl(); 6682 else 6683 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6684 6685 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6686 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6687 6688 if (FD) { 6689 FD->setBody(Body); 6690 if (FD->isMain()) { 6691 // C and C++ allow for main to automagically return 0. 6692 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6693 FD->setHasImplicitReturnZero(true); 6694 WP.disableCheckFallThrough(); 6695 } else if (FD->hasAttr<NakedAttr>()) { 6696 // If the function is marked 'naked', don't complain about missing return 6697 // statements. 6698 WP.disableCheckFallThrough(); 6699 } 6700 6701 // MSVC permits the use of pure specifier (=0) on function definition, 6702 // defined at class scope, warn about this non standard construct. 6703 if (getLangOptions().Microsoft && FD->isPure()) 6704 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6705 6706 if (!FD->isInvalidDecl()) { 6707 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6708 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6709 FD->getResultType(), FD); 6710 6711 // If this is a constructor, we need a vtable. 6712 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6713 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6714 6715 computeNRVO(Body, getCurFunction()); 6716 } 6717 6718 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6719 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6720 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6721 MD->setBody(Body); 6722 if (Body) 6723 MD->setEndLoc(Body->getLocEnd()); 6724 if (!MD->isInvalidDecl()) { 6725 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6726 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6727 MD->getResultType(), MD); 6728 6729 if (Body) 6730 computeNRVO(Body, getCurFunction()); 6731 } 6732 if (ObjCShouldCallSuperDealloc) { 6733 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 6734 ObjCShouldCallSuperDealloc = false; 6735 } 6736 if (ObjCShouldCallSuperFinalize) { 6737 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 6738 ObjCShouldCallSuperFinalize = false; 6739 } 6740 } else { 6741 return 0; 6742 } 6743 6744 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 6745 "ObjC methods, which should have been handled in the block above."); 6746 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 6747 "ObjC methods, which should have been handled in the block above."); 6748 6749 // Verify and clean out per-function state. 6750 if (Body) { 6751 // C++ constructors that have function-try-blocks can't have return 6752 // statements in the handlers of that block. (C++ [except.handle]p14) 6753 // Verify this. 6754 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6755 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6756 6757 // Verify that gotos and switch cases don't jump into scopes illegally. 6758 if (getCurFunction()->NeedsScopeChecking() && 6759 !dcl->isInvalidDecl() && 6760 !hasAnyUnrecoverableErrorsInThisFunction()) 6761 DiagnoseInvalidJumps(Body); 6762 6763 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6764 if (!Destructor->getParent()->isDependentType()) 6765 CheckDestructor(Destructor); 6766 6767 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6768 Destructor->getParent()); 6769 } 6770 6771 // If any errors have occurred, clear out any temporaries that may have 6772 // been leftover. This ensures that these temporaries won't be picked up for 6773 // deletion in some later function. 6774 if (PP.getDiagnostics().hasErrorOccurred() || 6775 PP.getDiagnostics().getSuppressAllDiagnostics()) { 6776 ExprTemporaries.clear(); 6777 ExprNeedsCleanups = false; 6778 } else if (!isa<FunctionTemplateDecl>(dcl)) { 6779 // Since the body is valid, issue any analysis-based warnings that are 6780 // enabled. 6781 ActivePolicy = &WP; 6782 } 6783 6784 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6785 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 6786 } 6787 6788 if (!IsInstantiation) 6789 PopDeclContext(); 6790 6791 PopFunctionOrBlockScope(ActivePolicy, dcl); 6792 6793 // If any errors have occurred, clear out any temporaries that may have 6794 // been leftover. This ensures that these temporaries won't be picked up for 6795 // deletion in some later function. 6796 if (getDiagnostics().hasErrorOccurred()) { 6797 ExprTemporaries.clear(); 6798 ExprNeedsCleanups = false; 6799 } 6800 6801 return dcl; 6802} 6803 6804 6805/// When we finish delayed parsing of an attribute, we must attach it to the 6806/// relevant Decl. 6807void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 6808 ParsedAttributes &Attrs) { 6809 ProcessDeclAttributeList(S, D, Attrs.getList()); 6810} 6811 6812 6813/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6814/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6815NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6816 IdentifierInfo &II, Scope *S) { 6817 // Before we produce a declaration for an implicitly defined 6818 // function, see whether there was a locally-scoped declaration of 6819 // this name as a function or variable. If so, use that 6820 // (non-visible) declaration, and complain about it. 6821 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6822 = findLocallyScopedExternalDecl(&II); 6823 if (Pos != LocallyScopedExternalDecls.end()) { 6824 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 6825 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 6826 return Pos->second; 6827 } 6828 6829 // Extension in C99. Legal in C90, but warn about it. 6830 if (II.getName().startswith("__builtin_")) 6831 Diag(Loc, diag::warn_builtin_unknown) << &II; 6832 else if (getLangOptions().C99) 6833 Diag(Loc, diag::ext_implicit_function_decl) << &II; 6834 else 6835 Diag(Loc, diag::warn_implicit_function_decl) << &II; 6836 6837 // Set a Declarator for the implicit definition: int foo(); 6838 const char *Dummy; 6839 AttributeFactory attrFactory; 6840 DeclSpec DS(attrFactory); 6841 unsigned DiagID; 6842 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 6843 (void)Error; // Silence warning. 6844 assert(!Error && "Error setting up implicit decl!"); 6845 Declarator D(DS, Declarator::BlockContext); 6846 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 6847 0, 0, true, SourceLocation(), 6848 SourceLocation(), 6849 EST_None, SourceLocation(), 6850 0, 0, 0, 0, Loc, Loc, D), 6851 DS.getAttributes(), 6852 SourceLocation()); 6853 D.SetIdentifier(&II, Loc); 6854 6855 // Insert this function into translation-unit scope. 6856 6857 DeclContext *PrevDC = CurContext; 6858 CurContext = Context.getTranslationUnitDecl(); 6859 6860 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 6861 FD->setImplicit(); 6862 6863 CurContext = PrevDC; 6864 6865 AddKnownFunctionAttributes(FD); 6866 6867 return FD; 6868} 6869 6870/// \brief Adds any function attributes that we know a priori based on 6871/// the declaration of this function. 6872/// 6873/// These attributes can apply both to implicitly-declared builtins 6874/// (like __builtin___printf_chk) or to library-declared functions 6875/// like NSLog or printf. 6876/// 6877/// We need to check for duplicate attributes both here and where user-written 6878/// attributes are applied to declarations. 6879void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 6880 if (FD->isInvalidDecl()) 6881 return; 6882 6883 // If this is a built-in function, map its builtin attributes to 6884 // actual attributes. 6885 if (unsigned BuiltinID = FD->getBuiltinID()) { 6886 // Handle printf-formatting attributes. 6887 unsigned FormatIdx; 6888 bool HasVAListArg; 6889 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 6890 if (!FD->getAttr<FormatAttr>()) 6891 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6892 "printf", FormatIdx+1, 6893 HasVAListArg ? 0 : FormatIdx+2)); 6894 } 6895 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 6896 HasVAListArg)) { 6897 if (!FD->getAttr<FormatAttr>()) 6898 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6899 "scanf", FormatIdx+1, 6900 HasVAListArg ? 0 : FormatIdx+2)); 6901 } 6902 6903 // Mark const if we don't care about errno and that is the only 6904 // thing preventing the function from being const. This allows 6905 // IRgen to use LLVM intrinsics for such functions. 6906 if (!getLangOptions().MathErrno && 6907 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 6908 if (!FD->getAttr<ConstAttr>()) 6909 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6910 } 6911 6912 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 6913 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 6914 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 6915 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6916 } 6917 6918 IdentifierInfo *Name = FD->getIdentifier(); 6919 if (!Name) 6920 return; 6921 if ((!getLangOptions().CPlusPlus && 6922 FD->getDeclContext()->isTranslationUnit()) || 6923 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 6924 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 6925 LinkageSpecDecl::lang_c)) { 6926 // Okay: this could be a libc/libm/Objective-C function we know 6927 // about. 6928 } else 6929 return; 6930 6931 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 6932 // FIXME: NSLog and NSLogv should be target specific 6933 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 6934 // FIXME: We known better than our headers. 6935 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 6936 } else 6937 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6938 "printf", 1, 6939 Name->isStr("NSLogv") ? 0 : 2)); 6940 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 6941 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 6942 // target-specific builtins, perhaps? 6943 if (!FD->getAttr<FormatAttr>()) 6944 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6945 "printf", 2, 6946 Name->isStr("vasprintf") ? 0 : 3)); 6947 } 6948} 6949 6950TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 6951 TypeSourceInfo *TInfo) { 6952 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 6953 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 6954 6955 if (!TInfo) { 6956 assert(D.isInvalidType() && "no declarator info for valid type"); 6957 TInfo = Context.getTrivialTypeSourceInfo(T); 6958 } 6959 6960 // Scope manipulation handled by caller. 6961 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 6962 D.getSourceRange().getBegin(), 6963 D.getIdentifierLoc(), 6964 D.getIdentifier(), 6965 TInfo); 6966 6967 // Bail out immediately if we have an invalid declaration. 6968 if (D.isInvalidType()) { 6969 NewTD->setInvalidDecl(); 6970 return NewTD; 6971 } 6972 6973 // C++ [dcl.typedef]p8: 6974 // If the typedef declaration defines an unnamed class (or 6975 // enum), the first typedef-name declared by the declaration 6976 // to be that class type (or enum type) is used to denote the 6977 // class type (or enum type) for linkage purposes only. 6978 // We need to check whether the type was declared in the declaration. 6979 switch (D.getDeclSpec().getTypeSpecType()) { 6980 case TST_enum: 6981 case TST_struct: 6982 case TST_union: 6983 case TST_class: { 6984 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 6985 6986 // Do nothing if the tag is not anonymous or already has an 6987 // associated typedef (from an earlier typedef in this decl group). 6988 if (tagFromDeclSpec->getIdentifier()) break; 6989 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 6990 6991 // A well-formed anonymous tag must always be a TUK_Definition. 6992 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 6993 6994 // The type must match the tag exactly; no qualifiers allowed. 6995 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 6996 break; 6997 6998 // Otherwise, set this is the anon-decl typedef for the tag. 6999 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7000 break; 7001 } 7002 7003 default: 7004 break; 7005 } 7006 7007 return NewTD; 7008} 7009 7010 7011/// \brief Determine whether a tag with a given kind is acceptable 7012/// as a redeclaration of the given tag declaration. 7013/// 7014/// \returns true if the new tag kind is acceptable, false otherwise. 7015bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7016 TagTypeKind NewTag, bool isDefinition, 7017 SourceLocation NewTagLoc, 7018 const IdentifierInfo &Name) { 7019 // C++ [dcl.type.elab]p3: 7020 // The class-key or enum keyword present in the 7021 // elaborated-type-specifier shall agree in kind with the 7022 // declaration to which the name in the elaborated-type-specifier 7023 // refers. This rule also applies to the form of 7024 // elaborated-type-specifier that declares a class-name or 7025 // friend class since it can be construed as referring to the 7026 // definition of the class. Thus, in any 7027 // elaborated-type-specifier, the enum keyword shall be used to 7028 // refer to an enumeration (7.2), the union class-key shall be 7029 // used to refer to a union (clause 9), and either the class or 7030 // struct class-key shall be used to refer to a class (clause 9) 7031 // declared using the class or struct class-key. 7032 TagTypeKind OldTag = Previous->getTagKind(); 7033 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7034 if (OldTag == NewTag) 7035 return true; 7036 7037 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7038 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7039 // Warn about the struct/class tag mismatch. 7040 bool isTemplate = false; 7041 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7042 isTemplate = Record->getDescribedClassTemplate(); 7043 7044 if (!ActiveTemplateInstantiations.empty()) { 7045 // In a template instantiation, do not offer fix-its for tag mismatches 7046 // since they usually mess up the template instead of fixing the problem. 7047 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7048 << (NewTag == TTK_Class) << isTemplate << &Name; 7049 return true; 7050 } 7051 7052 if (isDefinition) { 7053 // On definitions, check previous tags and issue a fix-it for each 7054 // one that doesn't match the current tag. 7055 if (Previous->getDefinition()) { 7056 // Don't suggest fix-its for redefinitions. 7057 return true; 7058 } 7059 7060 bool previousMismatch = false; 7061 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7062 E(Previous->redecls_end()); I != E; ++I) { 7063 if (I->getTagKind() != NewTag) { 7064 if (!previousMismatch) { 7065 previousMismatch = true; 7066 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7067 << (NewTag == TTK_Class) << isTemplate << &Name; 7068 } 7069 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7070 << (NewTag == TTK_Class) 7071 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7072 NewTag == TTK_Class? 7073 "class" : "struct"); 7074 } 7075 } 7076 return true; 7077 } 7078 7079 // Check for a previous definition. If current tag and definition 7080 // are same type, do nothing. If no definition, but disagree with 7081 // with previous tag type, give a warning, but no fix-it. 7082 const TagDecl *Redecl = Previous->getDefinition() ? 7083 Previous->getDefinition() : Previous; 7084 if (Redecl->getTagKind() == NewTag) { 7085 return true; 7086 } 7087 7088 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7089 << (NewTag == TTK_Class) 7090 << isTemplate << &Name; 7091 Diag(Redecl->getLocation(), diag::note_previous_use); 7092 7093 // If there is a previous defintion, suggest a fix-it. 7094 if (Previous->getDefinition()) { 7095 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7096 << (Redecl->getTagKind() == TTK_Class) 7097 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7098 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7099 } 7100 7101 return true; 7102 } 7103 return false; 7104} 7105 7106/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7107/// former case, Name will be non-null. In the later case, Name will be null. 7108/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7109/// reference/declaration/definition of a tag. 7110Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7111 SourceLocation KWLoc, CXXScopeSpec &SS, 7112 IdentifierInfo *Name, SourceLocation NameLoc, 7113 AttributeList *Attr, AccessSpecifier AS, 7114 MultiTemplateParamsArg TemplateParameterLists, 7115 bool &OwnedDecl, bool &IsDependent, 7116 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7117 TypeResult UnderlyingType) { 7118 // If this is not a definition, it must have a name. 7119 assert((Name != 0 || TUK == TUK_Definition) && 7120 "Nameless record must be a definition!"); 7121 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7122 7123 OwnedDecl = false; 7124 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7125 7126 // FIXME: Check explicit specializations more carefully. 7127 bool isExplicitSpecialization = false; 7128 bool Invalid = false; 7129 7130 // We only need to do this matching if we have template parameters 7131 // or a scope specifier, which also conveniently avoids this work 7132 // for non-C++ cases. 7133 if (TemplateParameterLists.size() > 0 || 7134 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7135 if (TemplateParameterList *TemplateParams 7136 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7137 TemplateParameterLists.get(), 7138 TemplateParameterLists.size(), 7139 TUK == TUK_Friend, 7140 isExplicitSpecialization, 7141 Invalid)) { 7142 if (TemplateParams->size() > 0) { 7143 // This is a declaration or definition of a class template (which may 7144 // be a member of another template). 7145 7146 if (Invalid) 7147 return 0; 7148 7149 OwnedDecl = false; 7150 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7151 SS, Name, NameLoc, Attr, 7152 TemplateParams, AS, 7153 TemplateParameterLists.size() - 1, 7154 (TemplateParameterList**) TemplateParameterLists.release()); 7155 return Result.get(); 7156 } else { 7157 // The "template<>" header is extraneous. 7158 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7159 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7160 isExplicitSpecialization = true; 7161 } 7162 } 7163 } 7164 7165 // Figure out the underlying type if this a enum declaration. We need to do 7166 // this early, because it's needed to detect if this is an incompatible 7167 // redeclaration. 7168 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7169 7170 if (Kind == TTK_Enum) { 7171 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7172 // No underlying type explicitly specified, or we failed to parse the 7173 // type, default to int. 7174 EnumUnderlying = Context.IntTy.getTypePtr(); 7175 else if (UnderlyingType.get()) { 7176 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7177 // integral type; any cv-qualification is ignored. 7178 TypeSourceInfo *TI = 0; 7179 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7180 EnumUnderlying = TI; 7181 7182 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7183 7184 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7185 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7186 << T; 7187 // Recover by falling back to int. 7188 EnumUnderlying = Context.IntTy.getTypePtr(); 7189 } 7190 7191 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7192 UPPC_FixedUnderlyingType)) 7193 EnumUnderlying = Context.IntTy.getTypePtr(); 7194 7195 } else if (getLangOptions().Microsoft) 7196 // Microsoft enums are always of int type. 7197 EnumUnderlying = Context.IntTy.getTypePtr(); 7198 } 7199 7200 DeclContext *SearchDC = CurContext; 7201 DeclContext *DC = CurContext; 7202 bool isStdBadAlloc = false; 7203 7204 RedeclarationKind Redecl = ForRedeclaration; 7205 if (TUK == TUK_Friend || TUK == TUK_Reference) 7206 Redecl = NotForRedeclaration; 7207 7208 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7209 7210 if (Name && SS.isNotEmpty()) { 7211 // We have a nested-name tag ('struct foo::bar'). 7212 7213 // Check for invalid 'foo::'. 7214 if (SS.isInvalid()) { 7215 Name = 0; 7216 goto CreateNewDecl; 7217 } 7218 7219 // If this is a friend or a reference to a class in a dependent 7220 // context, don't try to make a decl for it. 7221 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7222 DC = computeDeclContext(SS, false); 7223 if (!DC) { 7224 IsDependent = true; 7225 return 0; 7226 } 7227 } else { 7228 DC = computeDeclContext(SS, true); 7229 if (!DC) { 7230 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7231 << SS.getRange(); 7232 return 0; 7233 } 7234 } 7235 7236 if (RequireCompleteDeclContext(SS, DC)) 7237 return 0; 7238 7239 SearchDC = DC; 7240 // Look-up name inside 'foo::'. 7241 LookupQualifiedName(Previous, DC); 7242 7243 if (Previous.isAmbiguous()) 7244 return 0; 7245 7246 if (Previous.empty()) { 7247 // Name lookup did not find anything. However, if the 7248 // nested-name-specifier refers to the current instantiation, 7249 // and that current instantiation has any dependent base 7250 // classes, we might find something at instantiation time: treat 7251 // this as a dependent elaborated-type-specifier. 7252 // But this only makes any sense for reference-like lookups. 7253 if (Previous.wasNotFoundInCurrentInstantiation() && 7254 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7255 IsDependent = true; 7256 return 0; 7257 } 7258 7259 // A tag 'foo::bar' must already exist. 7260 Diag(NameLoc, diag::err_not_tag_in_scope) 7261 << Kind << Name << DC << SS.getRange(); 7262 Name = 0; 7263 Invalid = true; 7264 goto CreateNewDecl; 7265 } 7266 } else if (Name) { 7267 // If this is a named struct, check to see if there was a previous forward 7268 // declaration or definition. 7269 // FIXME: We're looking into outer scopes here, even when we 7270 // shouldn't be. Doing so can result in ambiguities that we 7271 // shouldn't be diagnosing. 7272 LookupName(Previous, S); 7273 7274 if (Previous.isAmbiguous() && 7275 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7276 LookupResult::Filter F = Previous.makeFilter(); 7277 while (F.hasNext()) { 7278 NamedDecl *ND = F.next(); 7279 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7280 F.erase(); 7281 } 7282 F.done(); 7283 } 7284 7285 // Note: there used to be some attempt at recovery here. 7286 if (Previous.isAmbiguous()) 7287 return 0; 7288 7289 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7290 // FIXME: This makes sure that we ignore the contexts associated 7291 // with C structs, unions, and enums when looking for a matching 7292 // tag declaration or definition. See the similar lookup tweak 7293 // in Sema::LookupName; is there a better way to deal with this? 7294 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7295 SearchDC = SearchDC->getParent(); 7296 } 7297 } else if (S->isFunctionPrototypeScope()) { 7298 // If this is an enum declaration in function prototype scope, set its 7299 // initial context to the translation unit. 7300 SearchDC = Context.getTranslationUnitDecl(); 7301 } 7302 7303 if (Previous.isSingleResult() && 7304 Previous.getFoundDecl()->isTemplateParameter()) { 7305 // Maybe we will complain about the shadowed template parameter. 7306 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7307 // Just pretend that we didn't see the previous declaration. 7308 Previous.clear(); 7309 } 7310 7311 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7312 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7313 // This is a declaration of or a reference to "std::bad_alloc". 7314 isStdBadAlloc = true; 7315 7316 if (Previous.empty() && StdBadAlloc) { 7317 // std::bad_alloc has been implicitly declared (but made invisible to 7318 // name lookup). Fill in this implicit declaration as the previous 7319 // declaration, so that the declarations get chained appropriately. 7320 Previous.addDecl(getStdBadAlloc()); 7321 } 7322 } 7323 7324 // If we didn't find a previous declaration, and this is a reference 7325 // (or friend reference), move to the correct scope. In C++, we 7326 // also need to do a redeclaration lookup there, just in case 7327 // there's a shadow friend decl. 7328 if (Name && Previous.empty() && 7329 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7330 if (Invalid) goto CreateNewDecl; 7331 assert(SS.isEmpty()); 7332 7333 if (TUK == TUK_Reference) { 7334 // C++ [basic.scope.pdecl]p5: 7335 // -- for an elaborated-type-specifier of the form 7336 // 7337 // class-key identifier 7338 // 7339 // if the elaborated-type-specifier is used in the 7340 // decl-specifier-seq or parameter-declaration-clause of a 7341 // function defined in namespace scope, the identifier is 7342 // declared as a class-name in the namespace that contains 7343 // the declaration; otherwise, except as a friend 7344 // declaration, the identifier is declared in the smallest 7345 // non-class, non-function-prototype scope that contains the 7346 // declaration. 7347 // 7348 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7349 // C structs and unions. 7350 // 7351 // It is an error in C++ to declare (rather than define) an enum 7352 // type, including via an elaborated type specifier. We'll 7353 // diagnose that later; for now, declare the enum in the same 7354 // scope as we would have picked for any other tag type. 7355 // 7356 // GNU C also supports this behavior as part of its incomplete 7357 // enum types extension, while GNU C++ does not. 7358 // 7359 // Find the context where we'll be declaring the tag. 7360 // FIXME: We would like to maintain the current DeclContext as the 7361 // lexical context, 7362 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7363 SearchDC = SearchDC->getParent(); 7364 7365 // Find the scope where we'll be declaring the tag. 7366 while (S->isClassScope() || 7367 (getLangOptions().CPlusPlus && 7368 S->isFunctionPrototypeScope()) || 7369 ((S->getFlags() & Scope::DeclScope) == 0) || 7370 (S->getEntity() && 7371 ((DeclContext *)S->getEntity())->isTransparentContext())) 7372 S = S->getParent(); 7373 } else { 7374 assert(TUK == TUK_Friend); 7375 // C++ [namespace.memdef]p3: 7376 // If a friend declaration in a non-local class first declares a 7377 // class or function, the friend class or function is a member of 7378 // the innermost enclosing namespace. 7379 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7380 } 7381 7382 // In C++, we need to do a redeclaration lookup to properly 7383 // diagnose some problems. 7384 if (getLangOptions().CPlusPlus) { 7385 Previous.setRedeclarationKind(ForRedeclaration); 7386 LookupQualifiedName(Previous, SearchDC); 7387 } 7388 } 7389 7390 if (!Previous.empty()) { 7391 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7392 7393 // It's okay to have a tag decl in the same scope as a typedef 7394 // which hides a tag decl in the same scope. Finding this 7395 // insanity with a redeclaration lookup can only actually happen 7396 // in C++. 7397 // 7398 // This is also okay for elaborated-type-specifiers, which is 7399 // technically forbidden by the current standard but which is 7400 // okay according to the likely resolution of an open issue; 7401 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7402 if (getLangOptions().CPlusPlus) { 7403 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7404 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7405 TagDecl *Tag = TT->getDecl(); 7406 if (Tag->getDeclName() == Name && 7407 Tag->getDeclContext()->getRedeclContext() 7408 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7409 PrevDecl = Tag; 7410 Previous.clear(); 7411 Previous.addDecl(Tag); 7412 Previous.resolveKind(); 7413 } 7414 } 7415 } 7416 } 7417 7418 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7419 // If this is a use of a previous tag, or if the tag is already declared 7420 // in the same scope (so that the definition/declaration completes or 7421 // rementions the tag), reuse the decl. 7422 if (TUK == TUK_Reference || TUK == TUK_Friend || 7423 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7424 // Make sure that this wasn't declared as an enum and now used as a 7425 // struct or something similar. 7426 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7427 TUK == TUK_Definition, KWLoc, 7428 *Name)) { 7429 bool SafeToContinue 7430 = (PrevTagDecl->getTagKind() != TTK_Enum && 7431 Kind != TTK_Enum); 7432 if (SafeToContinue) 7433 Diag(KWLoc, diag::err_use_with_wrong_tag) 7434 << Name 7435 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7436 PrevTagDecl->getKindName()); 7437 else 7438 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7439 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7440 7441 if (SafeToContinue) 7442 Kind = PrevTagDecl->getTagKind(); 7443 else { 7444 // Recover by making this an anonymous redefinition. 7445 Name = 0; 7446 Previous.clear(); 7447 Invalid = true; 7448 } 7449 } 7450 7451 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7452 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7453 7454 // All conflicts with previous declarations are recovered by 7455 // returning the previous declaration. 7456 if (ScopedEnum != PrevEnum->isScoped()) { 7457 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7458 << PrevEnum->isScoped(); 7459 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7460 return PrevTagDecl; 7461 } 7462 else if (EnumUnderlying && PrevEnum->isFixed()) { 7463 QualType T; 7464 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7465 T = TI->getType(); 7466 else 7467 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7468 7469 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7470 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7471 diag::err_enum_redeclare_type_mismatch) 7472 << T 7473 << PrevEnum->getIntegerType(); 7474 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7475 return PrevTagDecl; 7476 } 7477 } 7478 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7479 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7480 << PrevEnum->isFixed(); 7481 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7482 return PrevTagDecl; 7483 } 7484 } 7485 7486 if (!Invalid) { 7487 // If this is a use, just return the declaration we found. 7488 7489 // FIXME: In the future, return a variant or some other clue 7490 // for the consumer of this Decl to know it doesn't own it. 7491 // For our current ASTs this shouldn't be a problem, but will 7492 // need to be changed with DeclGroups. 7493 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7494 getLangOptions().Microsoft)) || TUK == TUK_Friend) 7495 return PrevTagDecl; 7496 7497 // Diagnose attempts to redefine a tag. 7498 if (TUK == TUK_Definition) { 7499 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7500 // If we're defining a specialization and the previous definition 7501 // is from an implicit instantiation, don't emit an error 7502 // here; we'll catch this in the general case below. 7503 if (!isExplicitSpecialization || 7504 !isa<CXXRecordDecl>(Def) || 7505 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7506 == TSK_ExplicitSpecialization) { 7507 Diag(NameLoc, diag::err_redefinition) << Name; 7508 Diag(Def->getLocation(), diag::note_previous_definition); 7509 // If this is a redefinition, recover by making this 7510 // struct be anonymous, which will make any later 7511 // references get the previous definition. 7512 Name = 0; 7513 Previous.clear(); 7514 Invalid = true; 7515 } 7516 } else { 7517 // If the type is currently being defined, complain 7518 // about a nested redefinition. 7519 const TagType *Tag 7520 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7521 if (Tag->isBeingDefined()) { 7522 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7523 Diag(PrevTagDecl->getLocation(), 7524 diag::note_previous_definition); 7525 Name = 0; 7526 Previous.clear(); 7527 Invalid = true; 7528 } 7529 } 7530 7531 // Okay, this is definition of a previously declared or referenced 7532 // tag PrevDecl. We're going to create a new Decl for it. 7533 } 7534 } 7535 // If we get here we have (another) forward declaration or we 7536 // have a definition. Just create a new decl. 7537 7538 } else { 7539 // If we get here, this is a definition of a new tag type in a nested 7540 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7541 // new decl/type. We set PrevDecl to NULL so that the entities 7542 // have distinct types. 7543 Previous.clear(); 7544 } 7545 // If we get here, we're going to create a new Decl. If PrevDecl 7546 // is non-NULL, it's a definition of the tag declared by 7547 // PrevDecl. If it's NULL, we have a new definition. 7548 7549 7550 // Otherwise, PrevDecl is not a tag, but was found with tag 7551 // lookup. This is only actually possible in C++, where a few 7552 // things like templates still live in the tag namespace. 7553 } else { 7554 assert(getLangOptions().CPlusPlus); 7555 7556 // Use a better diagnostic if an elaborated-type-specifier 7557 // found the wrong kind of type on the first 7558 // (non-redeclaration) lookup. 7559 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7560 !Previous.isForRedeclaration()) { 7561 unsigned Kind = 0; 7562 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7563 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7564 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7565 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7566 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7567 Invalid = true; 7568 7569 // Otherwise, only diagnose if the declaration is in scope. 7570 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7571 isExplicitSpecialization)) { 7572 // do nothing 7573 7574 // Diagnose implicit declarations introduced by elaborated types. 7575 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7576 unsigned Kind = 0; 7577 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7578 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7579 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7580 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7581 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7582 Invalid = true; 7583 7584 // Otherwise it's a declaration. Call out a particularly common 7585 // case here. 7586 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7587 unsigned Kind = 0; 7588 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7589 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7590 << Name << Kind << TND->getUnderlyingType(); 7591 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7592 Invalid = true; 7593 7594 // Otherwise, diagnose. 7595 } else { 7596 // The tag name clashes with something else in the target scope, 7597 // issue an error and recover by making this tag be anonymous. 7598 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7599 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7600 Name = 0; 7601 Invalid = true; 7602 } 7603 7604 // The existing declaration isn't relevant to us; we're in a 7605 // new scope, so clear out the previous declaration. 7606 Previous.clear(); 7607 } 7608 } 7609 7610CreateNewDecl: 7611 7612 TagDecl *PrevDecl = 0; 7613 if (Previous.isSingleResult()) 7614 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7615 7616 // If there is an identifier, use the location of the identifier as the 7617 // location of the decl, otherwise use the location of the struct/union 7618 // keyword. 7619 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7620 7621 // Otherwise, create a new declaration. If there is a previous 7622 // declaration of the same entity, the two will be linked via 7623 // PrevDecl. 7624 TagDecl *New; 7625 7626 bool IsForwardReference = false; 7627 if (Kind == TTK_Enum) { 7628 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7629 // enum X { A, B, C } D; D should chain to X. 7630 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7631 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7632 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7633 // If this is an undefined enum, warn. 7634 if (TUK != TUK_Definition && !Invalid) { 7635 TagDecl *Def; 7636 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7637 // C++0x: 7.2p2: opaque-enum-declaration. 7638 // Conflicts are diagnosed above. Do nothing. 7639 } 7640 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7641 Diag(Loc, diag::ext_forward_ref_enum_def) 7642 << New; 7643 Diag(Def->getLocation(), diag::note_previous_definition); 7644 } else { 7645 unsigned DiagID = diag::ext_forward_ref_enum; 7646 if (getLangOptions().Microsoft) 7647 DiagID = diag::ext_ms_forward_ref_enum; 7648 else if (getLangOptions().CPlusPlus) 7649 DiagID = diag::err_forward_ref_enum; 7650 Diag(Loc, DiagID); 7651 7652 // If this is a forward-declared reference to an enumeration, make a 7653 // note of it; we won't actually be introducing the declaration into 7654 // the declaration context. 7655 if (TUK == TUK_Reference) 7656 IsForwardReference = true; 7657 } 7658 } 7659 7660 if (EnumUnderlying) { 7661 EnumDecl *ED = cast<EnumDecl>(New); 7662 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7663 ED->setIntegerTypeSourceInfo(TI); 7664 else 7665 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7666 ED->setPromotionType(ED->getIntegerType()); 7667 } 7668 7669 } else { 7670 // struct/union/class 7671 7672 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7673 // struct X { int A; } D; D should chain to X. 7674 if (getLangOptions().CPlusPlus) { 7675 // FIXME: Look for a way to use RecordDecl for simple structs. 7676 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7677 cast_or_null<CXXRecordDecl>(PrevDecl)); 7678 7679 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7680 StdBadAlloc = cast<CXXRecordDecl>(New); 7681 } else 7682 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7683 cast_or_null<RecordDecl>(PrevDecl)); 7684 } 7685 7686 // Maybe add qualifier info. 7687 if (SS.isNotEmpty()) { 7688 if (SS.isSet()) { 7689 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7690 if (TemplateParameterLists.size() > 0) { 7691 New->setTemplateParameterListsInfo(Context, 7692 TemplateParameterLists.size(), 7693 (TemplateParameterList**) TemplateParameterLists.release()); 7694 } 7695 } 7696 else 7697 Invalid = true; 7698 } 7699 7700 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7701 // Add alignment attributes if necessary; these attributes are checked when 7702 // the ASTContext lays out the structure. 7703 // 7704 // It is important for implementing the correct semantics that this 7705 // happen here (in act on tag decl). The #pragma pack stack is 7706 // maintained as a result of parser callbacks which can occur at 7707 // many points during the parsing of a struct declaration (because 7708 // the #pragma tokens are effectively skipped over during the 7709 // parsing of the struct). 7710 AddAlignmentAttributesForRecord(RD); 7711 7712 AddMsStructLayoutForRecord(RD); 7713 } 7714 7715 // If this is a specialization of a member class (of a class template), 7716 // check the specialization. 7717 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7718 Invalid = true; 7719 7720 if (Invalid) 7721 New->setInvalidDecl(); 7722 7723 if (Attr) 7724 ProcessDeclAttributeList(S, New, Attr); 7725 7726 // If we're declaring or defining a tag in function prototype scope 7727 // in C, note that this type can only be used within the function. 7728 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7729 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7730 7731 // Set the lexical context. If the tag has a C++ scope specifier, the 7732 // lexical context will be different from the semantic context. 7733 New->setLexicalDeclContext(CurContext); 7734 7735 // Mark this as a friend decl if applicable. 7736 // In Microsoft mode, a friend declaration also acts as a forward 7737 // declaration so we always pass true to setObjectOfFriendDecl to make 7738 // the tag name visible. 7739 if (TUK == TUK_Friend) 7740 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 7741 getLangOptions().Microsoft); 7742 7743 // Set the access specifier. 7744 if (!Invalid && SearchDC->isRecord()) 7745 SetMemberAccessSpecifier(New, PrevDecl, AS); 7746 7747 if (TUK == TUK_Definition) 7748 New->startDefinition(); 7749 7750 // If this has an identifier, add it to the scope stack. 7751 if (TUK == TUK_Friend) { 7752 // We might be replacing an existing declaration in the lookup tables; 7753 // if so, borrow its access specifier. 7754 if (PrevDecl) 7755 New->setAccess(PrevDecl->getAccess()); 7756 7757 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7758 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7759 if (Name) // can be null along some error paths 7760 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7761 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7762 } else if (Name) { 7763 S = getNonFieldDeclScope(S); 7764 PushOnScopeChains(New, S, !IsForwardReference); 7765 if (IsForwardReference) 7766 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7767 7768 } else { 7769 CurContext->addDecl(New); 7770 } 7771 7772 // If this is the C FILE type, notify the AST context. 7773 if (IdentifierInfo *II = New->getIdentifier()) 7774 if (!New->isInvalidDecl() && 7775 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7776 II->isStr("FILE")) 7777 Context.setFILEDecl(New); 7778 7779 OwnedDecl = true; 7780 return New; 7781} 7782 7783void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7784 AdjustDeclIfTemplate(TagD); 7785 TagDecl *Tag = cast<TagDecl>(TagD); 7786 7787 // Enter the tag context. 7788 PushDeclContext(S, Tag); 7789} 7790 7791void Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 7792 assert(isa<ObjCContainerDecl>(IDecl) && 7793 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 7794 DeclContext *OCD = cast<DeclContext>(IDecl); 7795 assert(getContainingDC(OCD) == CurContext && 7796 "The next DeclContext should be lexically contained in the current one."); 7797 CurContext = OCD; 7798} 7799 7800void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 7801 SourceLocation FinalLoc, 7802 SourceLocation LBraceLoc) { 7803 AdjustDeclIfTemplate(TagD); 7804 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 7805 7806 FieldCollector->StartClass(); 7807 7808 if (!Record->getIdentifier()) 7809 return; 7810 7811 if (FinalLoc.isValid()) 7812 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 7813 7814 // C++ [class]p2: 7815 // [...] The class-name is also inserted into the scope of the 7816 // class itself; this is known as the injected-class-name. For 7817 // purposes of access checking, the injected-class-name is treated 7818 // as if it were a public member name. 7819 CXXRecordDecl *InjectedClassName 7820 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 7821 Record->getLocStart(), Record->getLocation(), 7822 Record->getIdentifier(), 7823 /*PrevDecl=*/0, 7824 /*DelayTypeCreation=*/true); 7825 Context.getTypeDeclType(InjectedClassName, Record); 7826 InjectedClassName->setImplicit(); 7827 InjectedClassName->setAccess(AS_public); 7828 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 7829 InjectedClassName->setDescribedClassTemplate(Template); 7830 PushOnScopeChains(InjectedClassName, S); 7831 assert(InjectedClassName->isInjectedClassName() && 7832 "Broken injected-class-name"); 7833} 7834 7835void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 7836 SourceLocation RBraceLoc) { 7837 AdjustDeclIfTemplate(TagD); 7838 TagDecl *Tag = cast<TagDecl>(TagD); 7839 Tag->setRBraceLoc(RBraceLoc); 7840 7841 if (isa<CXXRecordDecl>(Tag)) 7842 FieldCollector->FinishClass(); 7843 7844 // Exit this scope of this tag's definition. 7845 PopDeclContext(); 7846 7847 // Notify the consumer that we've defined a tag. 7848 Consumer.HandleTagDeclDefinition(Tag); 7849} 7850 7851void Sema::ActOnObjCContainerFinishDefinition() { 7852 // Exit this scope of this interface definition. 7853 PopDeclContext(); 7854} 7855 7856void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 7857 AdjustDeclIfTemplate(TagD); 7858 TagDecl *Tag = cast<TagDecl>(TagD); 7859 Tag->setInvalidDecl(); 7860 7861 // We're undoing ActOnTagStartDefinition here, not 7862 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 7863 // the FieldCollector. 7864 7865 PopDeclContext(); 7866} 7867 7868// Note that FieldName may be null for anonymous bitfields. 7869bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 7870 QualType FieldTy, const Expr *BitWidth, 7871 bool *ZeroWidth) { 7872 // Default to true; that shouldn't confuse checks for emptiness 7873 if (ZeroWidth) 7874 *ZeroWidth = true; 7875 7876 // C99 6.7.2.1p4 - verify the field type. 7877 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 7878 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 7879 // Handle incomplete types with specific error. 7880 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 7881 return true; 7882 if (FieldName) 7883 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 7884 << FieldName << FieldTy << BitWidth->getSourceRange(); 7885 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 7886 << FieldTy << BitWidth->getSourceRange(); 7887 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 7888 UPPC_BitFieldWidth)) 7889 return true; 7890 7891 // If the bit-width is type- or value-dependent, don't try to check 7892 // it now. 7893 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 7894 return false; 7895 7896 llvm::APSInt Value; 7897 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 7898 return true; 7899 7900 if (Value != 0 && ZeroWidth) 7901 *ZeroWidth = false; 7902 7903 // Zero-width bitfield is ok for anonymous field. 7904 if (Value == 0 && FieldName) 7905 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 7906 7907 if (Value.isSigned() && Value.isNegative()) { 7908 if (FieldName) 7909 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 7910 << FieldName << Value.toString(10); 7911 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 7912 << Value.toString(10); 7913 } 7914 7915 if (!FieldTy->isDependentType()) { 7916 uint64_t TypeSize = Context.getTypeSize(FieldTy); 7917 if (Value.getZExtValue() > TypeSize) { 7918 if (!getLangOptions().CPlusPlus) { 7919 if (FieldName) 7920 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 7921 << FieldName << (unsigned)Value.getZExtValue() 7922 << (unsigned)TypeSize; 7923 7924 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 7925 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7926 } 7927 7928 if (FieldName) 7929 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 7930 << FieldName << (unsigned)Value.getZExtValue() 7931 << (unsigned)TypeSize; 7932 else 7933 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 7934 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7935 } 7936 } 7937 7938 return false; 7939} 7940 7941/// ActOnField - Each field of a C struct/union is passed into this in order 7942/// to create a FieldDecl object for it. 7943Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 7944 Declarator &D, ExprTy *BitfieldWidth) { 7945 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 7946 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 7947 /*HasInit=*/false, AS_public); 7948 return Res; 7949} 7950 7951/// HandleField - Analyze a field of a C struct or a C++ data member. 7952/// 7953FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 7954 SourceLocation DeclStart, 7955 Declarator &D, Expr *BitWidth, bool HasInit, 7956 AccessSpecifier AS) { 7957 IdentifierInfo *II = D.getIdentifier(); 7958 SourceLocation Loc = DeclStart; 7959 if (II) Loc = D.getIdentifierLoc(); 7960 7961 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7962 QualType T = TInfo->getType(); 7963 if (getLangOptions().CPlusPlus) { 7964 CheckExtraCXXDefaultArguments(D); 7965 7966 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7967 UPPC_DataMemberType)) { 7968 D.setInvalidType(); 7969 T = Context.IntTy; 7970 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 7971 } 7972 } 7973 7974 DiagnoseFunctionSpecifiers(D); 7975 7976 if (D.getDeclSpec().isThreadSpecified()) 7977 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7978 if (D.getDeclSpec().isConstexprSpecified()) 7979 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 7980 << 2; 7981 7982 // Check to see if this name was declared as a member previously 7983 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 7984 LookupName(Previous, S); 7985 assert((Previous.empty() || Previous.isOverloadedResult() || 7986 Previous.isSingleResult()) 7987 && "Lookup of member name should be either overloaded, single or null"); 7988 7989 // If the name is overloaded then get any declaration else get the single result 7990 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 7991 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 7992 7993 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7994 // Maybe we will complain about the shadowed template parameter. 7995 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7996 // Just pretend that we didn't see the previous declaration. 7997 PrevDecl = 0; 7998 } 7999 8000 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8001 PrevDecl = 0; 8002 8003 bool Mutable 8004 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8005 SourceLocation TSSL = D.getSourceRange().getBegin(); 8006 FieldDecl *NewFD 8007 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8008 TSSL, AS, PrevDecl, &D); 8009 8010 if (NewFD->isInvalidDecl()) 8011 Record->setInvalidDecl(); 8012 8013 if (NewFD->isInvalidDecl() && PrevDecl) { 8014 // Don't introduce NewFD into scope; there's already something 8015 // with the same name in the same scope. 8016 } else if (II) { 8017 PushOnScopeChains(NewFD, S); 8018 } else 8019 Record->addDecl(NewFD); 8020 8021 return NewFD; 8022} 8023 8024/// \brief Build a new FieldDecl and check its well-formedness. 8025/// 8026/// This routine builds a new FieldDecl given the fields name, type, 8027/// record, etc. \p PrevDecl should refer to any previous declaration 8028/// with the same name and in the same scope as the field to be 8029/// created. 8030/// 8031/// \returns a new FieldDecl. 8032/// 8033/// \todo The Declarator argument is a hack. It will be removed once 8034FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8035 TypeSourceInfo *TInfo, 8036 RecordDecl *Record, SourceLocation Loc, 8037 bool Mutable, Expr *BitWidth, bool HasInit, 8038 SourceLocation TSSL, 8039 AccessSpecifier AS, NamedDecl *PrevDecl, 8040 Declarator *D) { 8041 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8042 bool InvalidDecl = false; 8043 if (D) InvalidDecl = D->isInvalidType(); 8044 8045 // If we receive a broken type, recover by assuming 'int' and 8046 // marking this declaration as invalid. 8047 if (T.isNull()) { 8048 InvalidDecl = true; 8049 T = Context.IntTy; 8050 } 8051 8052 QualType EltTy = Context.getBaseElementType(T); 8053 if (!EltTy->isDependentType() && 8054 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8055 // Fields of incomplete type force their record to be invalid. 8056 Record->setInvalidDecl(); 8057 InvalidDecl = true; 8058 } 8059 8060 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8061 // than a variably modified type. 8062 if (!InvalidDecl && T->isVariablyModifiedType()) { 8063 bool SizeIsNegative; 8064 llvm::APSInt Oversized; 8065 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8066 SizeIsNegative, 8067 Oversized); 8068 if (!FixedTy.isNull()) { 8069 Diag(Loc, diag::warn_illegal_constant_array_size); 8070 T = FixedTy; 8071 } else { 8072 if (SizeIsNegative) 8073 Diag(Loc, diag::err_typecheck_negative_array_size); 8074 else if (Oversized.getBoolValue()) 8075 Diag(Loc, diag::err_array_too_large) 8076 << Oversized.toString(10); 8077 else 8078 Diag(Loc, diag::err_typecheck_field_variable_size); 8079 InvalidDecl = true; 8080 } 8081 } 8082 8083 // Fields can not have abstract class types 8084 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8085 diag::err_abstract_type_in_decl, 8086 AbstractFieldType)) 8087 InvalidDecl = true; 8088 8089 bool ZeroWidth = false; 8090 // If this is declared as a bit-field, check the bit-field. 8091 if (!InvalidDecl && BitWidth && 8092 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8093 InvalidDecl = true; 8094 BitWidth = 0; 8095 ZeroWidth = false; 8096 } 8097 8098 // Check that 'mutable' is consistent with the type of the declaration. 8099 if (!InvalidDecl && Mutable) { 8100 unsigned DiagID = 0; 8101 if (T->isReferenceType()) 8102 DiagID = diag::err_mutable_reference; 8103 else if (T.isConstQualified()) 8104 DiagID = diag::err_mutable_const; 8105 8106 if (DiagID) { 8107 SourceLocation ErrLoc = Loc; 8108 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8109 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8110 Diag(ErrLoc, DiagID); 8111 Mutable = false; 8112 InvalidDecl = true; 8113 } 8114 } 8115 8116 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8117 BitWidth, Mutable, HasInit); 8118 if (InvalidDecl) 8119 NewFD->setInvalidDecl(); 8120 8121 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8122 Diag(Loc, diag::err_duplicate_member) << II; 8123 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8124 NewFD->setInvalidDecl(); 8125 } 8126 8127 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8128 if (Record->isUnion()) { 8129 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8130 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8131 if (RDecl->getDefinition()) { 8132 // C++ [class.union]p1: An object of a class with a non-trivial 8133 // constructor, a non-trivial copy constructor, a non-trivial 8134 // destructor, or a non-trivial copy assignment operator 8135 // cannot be a member of a union, nor can an array of such 8136 // objects. 8137 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 8138 NewFD->setInvalidDecl(); 8139 } 8140 } 8141 8142 // C++ [class.union]p1: If a union contains a member of reference type, 8143 // the program is ill-formed. 8144 if (EltTy->isReferenceType()) { 8145 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8146 << NewFD->getDeclName() << EltTy; 8147 NewFD->setInvalidDecl(); 8148 } 8149 } 8150 } 8151 8152 // FIXME: We need to pass in the attributes given an AST 8153 // representation, not a parser representation. 8154 if (D) 8155 // FIXME: What to pass instead of TUScope? 8156 ProcessDeclAttributes(TUScope, NewFD, *D); 8157 8158 // In auto-retain/release, infer strong retension for fields of 8159 // retainable type. 8160 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8161 NewFD->setInvalidDecl(); 8162 8163 if (T.isObjCGCWeak()) 8164 Diag(Loc, diag::warn_attribute_weak_on_field); 8165 8166 NewFD->setAccess(AS); 8167 return NewFD; 8168} 8169 8170bool Sema::CheckNontrivialField(FieldDecl *FD) { 8171 assert(FD); 8172 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8173 8174 if (FD->isInvalidDecl()) 8175 return true; 8176 8177 QualType EltTy = Context.getBaseElementType(FD->getType()); 8178 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8179 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8180 if (RDecl->getDefinition()) { 8181 // We check for copy constructors before constructors 8182 // because otherwise we'll never get complaints about 8183 // copy constructors. 8184 8185 CXXSpecialMember member = CXXInvalid; 8186 if (!RDecl->hasTrivialCopyConstructor()) 8187 member = CXXCopyConstructor; 8188 else if (!RDecl->hasTrivialDefaultConstructor()) 8189 member = CXXDefaultConstructor; 8190 else if (!RDecl->hasTrivialCopyAssignment()) 8191 member = CXXCopyAssignment; 8192 else if (!RDecl->hasTrivialDestructor()) 8193 member = CXXDestructor; 8194 8195 if (member != CXXInvalid) { 8196 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8197 // Objective-C++ ARC: it is an error to have a non-trivial field of 8198 // a union. However, system headers in Objective-C programs 8199 // occasionally have Objective-C lifetime objects within unions, 8200 // and rather than cause the program to fail, we make those 8201 // members unavailable. 8202 SourceLocation Loc = FD->getLocation(); 8203 if (getSourceManager().isInSystemHeader(Loc)) { 8204 if (!FD->hasAttr<UnavailableAttr>()) 8205 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8206 "this system field has retaining ownership")); 8207 return false; 8208 } 8209 } 8210 8211 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 8212 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8213 DiagnoseNontrivial(RT, member); 8214 return true; 8215 } 8216 } 8217 } 8218 8219 return false; 8220} 8221 8222/// DiagnoseNontrivial - Given that a class has a non-trivial 8223/// special member, figure out why. 8224void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8225 QualType QT(T, 0U); 8226 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8227 8228 // Check whether the member was user-declared. 8229 switch (member) { 8230 case CXXInvalid: 8231 break; 8232 8233 case CXXDefaultConstructor: 8234 if (RD->hasUserDeclaredConstructor()) { 8235 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8236 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8237 const FunctionDecl *body = 0; 8238 ci->hasBody(body); 8239 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8240 SourceLocation CtorLoc = ci->getLocation(); 8241 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8242 return; 8243 } 8244 } 8245 8246 assert(0 && "found no user-declared constructors"); 8247 return; 8248 } 8249 break; 8250 8251 case CXXCopyConstructor: 8252 if (RD->hasUserDeclaredCopyConstructor()) { 8253 SourceLocation CtorLoc = 8254 RD->getCopyConstructor(0)->getLocation(); 8255 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8256 return; 8257 } 8258 break; 8259 8260 case CXXMoveConstructor: 8261 if (RD->hasUserDeclaredMoveConstructor()) { 8262 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8263 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8264 return; 8265 } 8266 break; 8267 8268 case CXXCopyAssignment: 8269 if (RD->hasUserDeclaredCopyAssignment()) { 8270 // FIXME: this should use the location of the copy 8271 // assignment, not the type. 8272 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8273 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8274 return; 8275 } 8276 break; 8277 8278 case CXXMoveAssignment: 8279 if (RD->hasUserDeclaredMoveAssignment()) { 8280 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8281 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8282 return; 8283 } 8284 break; 8285 8286 case CXXDestructor: 8287 if (RD->hasUserDeclaredDestructor()) { 8288 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8289 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8290 return; 8291 } 8292 break; 8293 } 8294 8295 typedef CXXRecordDecl::base_class_iterator base_iter; 8296 8297 // Virtual bases and members inhibit trivial copying/construction, 8298 // but not trivial destruction. 8299 if (member != CXXDestructor) { 8300 // Check for virtual bases. vbases includes indirect virtual bases, 8301 // so we just iterate through the direct bases. 8302 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8303 if (bi->isVirtual()) { 8304 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8305 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8306 return; 8307 } 8308 8309 // Check for virtual methods. 8310 typedef CXXRecordDecl::method_iterator meth_iter; 8311 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8312 ++mi) { 8313 if (mi->isVirtual()) { 8314 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8315 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8316 return; 8317 } 8318 } 8319 } 8320 8321 bool (CXXRecordDecl::*hasTrivial)() const; 8322 switch (member) { 8323 case CXXDefaultConstructor: 8324 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8325 case CXXCopyConstructor: 8326 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8327 case CXXCopyAssignment: 8328 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8329 case CXXDestructor: 8330 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8331 default: 8332 assert(0 && "unexpected special member"); return; 8333 } 8334 8335 // Check for nontrivial bases (and recurse). 8336 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8337 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8338 assert(BaseRT && "Don't know how to handle dependent bases"); 8339 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8340 if (!(BaseRecTy->*hasTrivial)()) { 8341 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8342 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8343 DiagnoseNontrivial(BaseRT, member); 8344 return; 8345 } 8346 } 8347 8348 // Check for nontrivial members (and recurse). 8349 typedef RecordDecl::field_iterator field_iter; 8350 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8351 ++fi) { 8352 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8353 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8354 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8355 8356 if (!(EltRD->*hasTrivial)()) { 8357 SourceLocation FLoc = (*fi)->getLocation(); 8358 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8359 DiagnoseNontrivial(EltRT, member); 8360 return; 8361 } 8362 } 8363 8364 if (EltTy->isObjCLifetimeType()) { 8365 switch (EltTy.getObjCLifetime()) { 8366 case Qualifiers::OCL_None: 8367 case Qualifiers::OCL_ExplicitNone: 8368 break; 8369 8370 case Qualifiers::OCL_Autoreleasing: 8371 case Qualifiers::OCL_Weak: 8372 case Qualifiers::OCL_Strong: 8373 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8374 << QT << EltTy.getObjCLifetime(); 8375 return; 8376 } 8377 } 8378 } 8379 8380 assert(0 && "found no explanation for non-trivial member"); 8381} 8382 8383/// TranslateIvarVisibility - Translate visibility from a token ID to an 8384/// AST enum value. 8385static ObjCIvarDecl::AccessControl 8386TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8387 switch (ivarVisibility) { 8388 default: assert(0 && "Unknown visitibility kind"); 8389 case tok::objc_private: return ObjCIvarDecl::Private; 8390 case tok::objc_public: return ObjCIvarDecl::Public; 8391 case tok::objc_protected: return ObjCIvarDecl::Protected; 8392 case tok::objc_package: return ObjCIvarDecl::Package; 8393 } 8394} 8395 8396/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8397/// in order to create an IvarDecl object for it. 8398Decl *Sema::ActOnIvar(Scope *S, 8399 SourceLocation DeclStart, 8400 Declarator &D, ExprTy *BitfieldWidth, 8401 tok::ObjCKeywordKind Visibility) { 8402 8403 IdentifierInfo *II = D.getIdentifier(); 8404 Expr *BitWidth = (Expr*)BitfieldWidth; 8405 SourceLocation Loc = DeclStart; 8406 if (II) Loc = D.getIdentifierLoc(); 8407 8408 // FIXME: Unnamed fields can be handled in various different ways, for 8409 // example, unnamed unions inject all members into the struct namespace! 8410 8411 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8412 QualType T = TInfo->getType(); 8413 8414 if (BitWidth) { 8415 // 6.7.2.1p3, 6.7.2.1p4 8416 if (VerifyBitField(Loc, II, T, BitWidth)) { 8417 D.setInvalidType(); 8418 BitWidth = 0; 8419 } 8420 } else { 8421 // Not a bitfield. 8422 8423 // validate II. 8424 8425 } 8426 if (T->isReferenceType()) { 8427 Diag(Loc, diag::err_ivar_reference_type); 8428 D.setInvalidType(); 8429 } 8430 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8431 // than a variably modified type. 8432 else if (T->isVariablyModifiedType()) { 8433 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8434 D.setInvalidType(); 8435 } 8436 8437 // Get the visibility (access control) for this ivar. 8438 ObjCIvarDecl::AccessControl ac = 8439 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8440 : ObjCIvarDecl::None; 8441 // Must set ivar's DeclContext to its enclosing interface. 8442 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8443 ObjCContainerDecl *EnclosingContext; 8444 if (ObjCImplementationDecl *IMPDecl = 8445 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8446 if (!LangOpts.ObjCNonFragileABI2) { 8447 // Case of ivar declared in an implementation. Context is that of its class. 8448 EnclosingContext = IMPDecl->getClassInterface(); 8449 assert(EnclosingContext && "Implementation has no class interface!"); 8450 } 8451 else 8452 EnclosingContext = EnclosingDecl; 8453 } else { 8454 if (ObjCCategoryDecl *CDecl = 8455 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8456 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8457 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8458 return 0; 8459 } 8460 } 8461 EnclosingContext = EnclosingDecl; 8462 } 8463 8464 // Construct the decl. 8465 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8466 DeclStart, Loc, II, T, 8467 TInfo, ac, (Expr *)BitfieldWidth); 8468 8469 if (II) { 8470 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8471 ForRedeclaration); 8472 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8473 && !isa<TagDecl>(PrevDecl)) { 8474 Diag(Loc, diag::err_duplicate_member) << II; 8475 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8476 NewID->setInvalidDecl(); 8477 } 8478 } 8479 8480 // Process attributes attached to the ivar. 8481 ProcessDeclAttributes(S, NewID, D); 8482 8483 if (D.isInvalidType()) 8484 NewID->setInvalidDecl(); 8485 8486 // In ARC, infer 'retaining' for ivars of retainable type. 8487 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8488 NewID->setInvalidDecl(); 8489 8490 if (II) { 8491 // FIXME: When interfaces are DeclContexts, we'll need to add 8492 // these to the interface. 8493 S->AddDecl(NewID); 8494 IdResolver.AddDecl(NewID); 8495 } 8496 8497 return NewID; 8498} 8499 8500/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8501/// class and class extensions. For every class @interface and class 8502/// extension @interface, if the last ivar is a bitfield of any type, 8503/// then add an implicit `char :0` ivar to the end of that interface. 8504void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8505 SmallVectorImpl<Decl *> &AllIvarDecls) { 8506 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8507 return; 8508 8509 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8510 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8511 8512 if (!Ivar->isBitField()) 8513 return; 8514 uint64_t BitFieldSize = 8515 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 8516 if (BitFieldSize == 0) 8517 return; 8518 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8519 if (!ID) { 8520 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8521 if (!CD->IsClassExtension()) 8522 return; 8523 } 8524 // No need to add this to end of @implementation. 8525 else 8526 return; 8527 } 8528 // All conditions are met. Add a new bitfield to the tail end of ivars. 8529 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8530 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8531 8532 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8533 DeclLoc, DeclLoc, 0, 8534 Context.CharTy, 8535 Context.getTrivialTypeSourceInfo(Context.CharTy, 8536 DeclLoc), 8537 ObjCIvarDecl::Private, BW, 8538 true); 8539 AllIvarDecls.push_back(Ivar); 8540} 8541 8542void Sema::ActOnFields(Scope* S, 8543 SourceLocation RecLoc, Decl *EnclosingDecl, 8544 Decl **Fields, unsigned NumFields, 8545 SourceLocation LBrac, SourceLocation RBrac, 8546 AttributeList *Attr) { 8547 assert(EnclosingDecl && "missing record or interface decl"); 8548 8549 // If the decl this is being inserted into is invalid, then it may be a 8550 // redeclaration or some other bogus case. Don't try to add fields to it. 8551 if (EnclosingDecl->isInvalidDecl()) { 8552 // FIXME: Deallocate fields? 8553 return; 8554 } 8555 8556 8557 // Verify that all the fields are okay. 8558 unsigned NumNamedMembers = 0; 8559 SmallVector<FieldDecl*, 32> RecFields; 8560 8561 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8562 bool ARCErrReported = false; 8563 for (unsigned i = 0; i != NumFields; ++i) { 8564 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 8565 8566 // Get the type for the field. 8567 const Type *FDTy = FD->getType().getTypePtr(); 8568 8569 if (!FD->isAnonymousStructOrUnion()) { 8570 // Remember all fields written by the user. 8571 RecFields.push_back(FD); 8572 } 8573 8574 // If the field is already invalid for some reason, don't emit more 8575 // diagnostics about it. 8576 if (FD->isInvalidDecl()) { 8577 EnclosingDecl->setInvalidDecl(); 8578 continue; 8579 } 8580 8581 // C99 6.7.2.1p2: 8582 // A structure or union shall not contain a member with 8583 // incomplete or function type (hence, a structure shall not 8584 // contain an instance of itself, but may contain a pointer to 8585 // an instance of itself), except that the last member of a 8586 // structure with more than one named member may have incomplete 8587 // array type; such a structure (and any union containing, 8588 // possibly recursively, a member that is such a structure) 8589 // shall not be a member of a structure or an element of an 8590 // array. 8591 if (FDTy->isFunctionType()) { 8592 // Field declared as a function. 8593 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8594 << FD->getDeclName(); 8595 FD->setInvalidDecl(); 8596 EnclosingDecl->setInvalidDecl(); 8597 continue; 8598 } else if (FDTy->isIncompleteArrayType() && Record && 8599 ((i == NumFields - 1 && !Record->isUnion()) || 8600 ((getLangOptions().Microsoft || getLangOptions().CPlusPlus) && 8601 (i == NumFields - 1 || Record->isUnion())))) { 8602 // Flexible array member. 8603 // Microsoft and g++ is more permissive regarding flexible array. 8604 // It will accept flexible array in union and also 8605 // as the sole element of a struct/class. 8606 if (getLangOptions().Microsoft) { 8607 if (Record->isUnion()) 8608 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8609 << FD->getDeclName(); 8610 else if (NumFields == 1) 8611 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8612 << FD->getDeclName() << Record->getTagKind(); 8613 } else if (getLangOptions().CPlusPlus) { 8614 if (Record->isUnion()) 8615 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8616 << FD->getDeclName(); 8617 else if (NumFields == 1) 8618 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8619 << FD->getDeclName() << Record->getTagKind(); 8620 } else if (NumNamedMembers < 1) { 8621 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8622 << FD->getDeclName(); 8623 FD->setInvalidDecl(); 8624 EnclosingDecl->setInvalidDecl(); 8625 continue; 8626 } 8627 if (!FD->getType()->isDependentType() && 8628 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 8629 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8630 << FD->getDeclName() << FD->getType(); 8631 FD->setInvalidDecl(); 8632 EnclosingDecl->setInvalidDecl(); 8633 continue; 8634 } 8635 // Okay, we have a legal flexible array member at the end of the struct. 8636 if (Record) 8637 Record->setHasFlexibleArrayMember(true); 8638 } else if (!FDTy->isDependentType() && 8639 RequireCompleteType(FD->getLocation(), FD->getType(), 8640 diag::err_field_incomplete)) { 8641 // Incomplete type 8642 FD->setInvalidDecl(); 8643 EnclosingDecl->setInvalidDecl(); 8644 continue; 8645 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8646 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8647 // If this is a member of a union, then entire union becomes "flexible". 8648 if (Record && Record->isUnion()) { 8649 Record->setHasFlexibleArrayMember(true); 8650 } else { 8651 // If this is a struct/class and this is not the last element, reject 8652 // it. Note that GCC supports variable sized arrays in the middle of 8653 // structures. 8654 if (i != NumFields-1) 8655 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8656 << FD->getDeclName() << FD->getType(); 8657 else { 8658 // We support flexible arrays at the end of structs in 8659 // other structs as an extension. 8660 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8661 << FD->getDeclName(); 8662 if (Record) 8663 Record->setHasFlexibleArrayMember(true); 8664 } 8665 } 8666 } 8667 if (Record && FDTTy->getDecl()->hasObjectMember()) 8668 Record->setHasObjectMember(true); 8669 } else if (FDTy->isObjCObjectType()) { 8670 /// A field cannot be an Objective-c object 8671 Diag(FD->getLocation(), diag::err_statically_allocated_object) 8672 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 8673 QualType T = Context.getObjCObjectPointerType(FD->getType()); 8674 FD->setType(T); 8675 } 8676 else if (!getLangOptions().CPlusPlus) { 8677 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 8678 // It's an error in ARC if a field has lifetime. 8679 // We don't want to report this in a system header, though, 8680 // so we just make the field unavailable. 8681 // FIXME: that's really not sufficient; we need to make the type 8682 // itself invalid to, say, initialize or copy. 8683 QualType T = FD->getType(); 8684 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 8685 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 8686 SourceLocation loc = FD->getLocation(); 8687 if (getSourceManager().isInSystemHeader(loc)) { 8688 if (!FD->hasAttr<UnavailableAttr>()) { 8689 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 8690 "this system field has retaining ownership")); 8691 } 8692 } else { 8693 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 8694 } 8695 ARCErrReported = true; 8696 } 8697 } 8698 else if (getLangOptions().ObjC1 && 8699 getLangOptions().getGCMode() != LangOptions::NonGC && 8700 Record && !Record->hasObjectMember()) { 8701 if (FD->getType()->isObjCObjectPointerType() || 8702 FD->getType().isObjCGCStrong()) 8703 Record->setHasObjectMember(true); 8704 else if (Context.getAsArrayType(FD->getType())) { 8705 QualType BaseType = Context.getBaseElementType(FD->getType()); 8706 if (BaseType->isRecordType() && 8707 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8708 Record->setHasObjectMember(true); 8709 else if (BaseType->isObjCObjectPointerType() || 8710 BaseType.isObjCGCStrong()) 8711 Record->setHasObjectMember(true); 8712 } 8713 } 8714 } 8715 // Keep track of the number of named members. 8716 if (FD->getIdentifier()) 8717 ++NumNamedMembers; 8718 } 8719 8720 // Okay, we successfully defined 'Record'. 8721 if (Record) { 8722 bool Completed = false; 8723 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8724 if (!CXXRecord->isInvalidDecl()) { 8725 // Set access bits correctly on the directly-declared conversions. 8726 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8727 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8728 I != E; ++I) 8729 Convs->setAccess(I, (*I)->getAccess()); 8730 8731 if (!CXXRecord->isDependentType()) { 8732 // Objective-C Automatic Reference Counting: 8733 // If a class has a non-static data member of Objective-C pointer 8734 // type (or array thereof), it is a non-POD type and its 8735 // default constructor (if any), copy constructor, copy assignment 8736 // operator, and destructor are non-trivial. 8737 // 8738 // This rule is also handled by CXXRecordDecl::completeDefinition(). 8739 // However, here we check whether this particular class is only 8740 // non-POD because of the presence of an Objective-C pointer member. 8741 // If so, objects of this type cannot be shared between code compiled 8742 // with instant objects and code compiled with manual retain/release. 8743 if (getLangOptions().ObjCAutoRefCount && 8744 CXXRecord->hasObjectMember() && 8745 CXXRecord->getLinkage() == ExternalLinkage) { 8746 if (CXXRecord->isPOD()) { 8747 Diag(CXXRecord->getLocation(), 8748 diag::warn_arc_non_pod_class_with_object_member) 8749 << CXXRecord; 8750 } else { 8751 // FIXME: Fix-Its would be nice here, but finding a good location 8752 // for them is going to be tricky. 8753 if (CXXRecord->hasTrivialCopyConstructor()) 8754 Diag(CXXRecord->getLocation(), 8755 diag::warn_arc_trivial_member_function_with_object_member) 8756 << CXXRecord << 0; 8757 if (CXXRecord->hasTrivialCopyAssignment()) 8758 Diag(CXXRecord->getLocation(), 8759 diag::warn_arc_trivial_member_function_with_object_member) 8760 << CXXRecord << 1; 8761 if (CXXRecord->hasTrivialDestructor()) 8762 Diag(CXXRecord->getLocation(), 8763 diag::warn_arc_trivial_member_function_with_object_member) 8764 << CXXRecord << 2; 8765 } 8766 } 8767 8768 // Adjust user-defined destructor exception spec. 8769 if (getLangOptions().CPlusPlus0x && 8770 CXXRecord->hasUserDeclaredDestructor()) 8771 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8772 8773 // Add any implicitly-declared members to this class. 8774 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8775 8776 // If we have virtual base classes, we may end up finding multiple 8777 // final overriders for a given virtual function. Check for this 8778 // problem now. 8779 if (CXXRecord->getNumVBases()) { 8780 CXXFinalOverriderMap FinalOverriders; 8781 CXXRecord->getFinalOverriders(FinalOverriders); 8782 8783 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8784 MEnd = FinalOverriders.end(); 8785 M != MEnd; ++M) { 8786 for (OverridingMethods::iterator SO = M->second.begin(), 8787 SOEnd = M->second.end(); 8788 SO != SOEnd; ++SO) { 8789 assert(SO->second.size() > 0 && 8790 "Virtual function without overridding functions?"); 8791 if (SO->second.size() == 1) 8792 continue; 8793 8794 // C++ [class.virtual]p2: 8795 // In a derived class, if a virtual member function of a base 8796 // class subobject has more than one final overrider the 8797 // program is ill-formed. 8798 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 8799 << (NamedDecl *)M->first << Record; 8800 Diag(M->first->getLocation(), 8801 diag::note_overridden_virtual_function); 8802 for (OverridingMethods::overriding_iterator 8803 OM = SO->second.begin(), 8804 OMEnd = SO->second.end(); 8805 OM != OMEnd; ++OM) 8806 Diag(OM->Method->getLocation(), diag::note_final_overrider) 8807 << (NamedDecl *)M->first << OM->Method->getParent(); 8808 8809 Record->setInvalidDecl(); 8810 } 8811 } 8812 CXXRecord->completeDefinition(&FinalOverriders); 8813 Completed = true; 8814 } 8815 } 8816 } 8817 } 8818 8819 if (!Completed) 8820 Record->completeDefinition(); 8821 8822 // Now that the record is complete, do any delayed exception spec checks 8823 // we were missing. 8824 while (!DelayedDestructorExceptionSpecChecks.empty()) { 8825 const CXXDestructorDecl *Dtor = 8826 DelayedDestructorExceptionSpecChecks.back().first; 8827 if (Dtor->getParent() != Record) 8828 break; 8829 8830 assert(!Dtor->getParent()->isDependentType() && 8831 "Should not ever add destructors of templates into the list."); 8832 CheckOverridingFunctionExceptionSpec(Dtor, 8833 DelayedDestructorExceptionSpecChecks.back().second); 8834 DelayedDestructorExceptionSpecChecks.pop_back(); 8835 } 8836 8837 } else { 8838 ObjCIvarDecl **ClsFields = 8839 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 8840 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 8841 ID->setLocEnd(RBrac); 8842 // Add ivar's to class's DeclContext. 8843 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8844 ClsFields[i]->setLexicalDeclContext(ID); 8845 ID->addDecl(ClsFields[i]); 8846 } 8847 // Must enforce the rule that ivars in the base classes may not be 8848 // duplicates. 8849 if (ID->getSuperClass()) 8850 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 8851 } else if (ObjCImplementationDecl *IMPDecl = 8852 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8853 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 8854 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 8855 // Ivar declared in @implementation never belongs to the implementation. 8856 // Only it is in implementation's lexical context. 8857 ClsFields[I]->setLexicalDeclContext(IMPDecl); 8858 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 8859 } else if (ObjCCategoryDecl *CDecl = 8860 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8861 // case of ivars in class extension; all other cases have been 8862 // reported as errors elsewhere. 8863 // FIXME. Class extension does not have a LocEnd field. 8864 // CDecl->setLocEnd(RBrac); 8865 // Add ivar's to class extension's DeclContext. 8866 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8867 ClsFields[i]->setLexicalDeclContext(CDecl); 8868 CDecl->addDecl(ClsFields[i]); 8869 } 8870 } 8871 } 8872 8873 if (Attr) 8874 ProcessDeclAttributeList(S, Record, Attr); 8875 8876 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 8877 // set the visibility of this record. 8878 if (Record && !Record->getDeclContext()->isRecord()) 8879 AddPushedVisibilityAttribute(Record); 8880} 8881 8882/// \brief Determine whether the given integral value is representable within 8883/// the given type T. 8884static bool isRepresentableIntegerValue(ASTContext &Context, 8885 llvm::APSInt &Value, 8886 QualType T) { 8887 assert(T->isIntegralType(Context) && "Integral type required!"); 8888 unsigned BitWidth = Context.getIntWidth(T); 8889 8890 if (Value.isUnsigned() || Value.isNonNegative()) { 8891 if (T->isSignedIntegerOrEnumerationType()) 8892 --BitWidth; 8893 return Value.getActiveBits() <= BitWidth; 8894 } 8895 return Value.getMinSignedBits() <= BitWidth; 8896} 8897 8898// \brief Given an integral type, return the next larger integral type 8899// (or a NULL type of no such type exists). 8900static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 8901 // FIXME: Int128/UInt128 support, which also needs to be introduced into 8902 // enum checking below. 8903 assert(T->isIntegralType(Context) && "Integral type required!"); 8904 const unsigned NumTypes = 4; 8905 QualType SignedIntegralTypes[NumTypes] = { 8906 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 8907 }; 8908 QualType UnsignedIntegralTypes[NumTypes] = { 8909 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 8910 Context.UnsignedLongLongTy 8911 }; 8912 8913 unsigned BitWidth = Context.getTypeSize(T); 8914 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 8915 : UnsignedIntegralTypes; 8916 for (unsigned I = 0; I != NumTypes; ++I) 8917 if (Context.getTypeSize(Types[I]) > BitWidth) 8918 return Types[I]; 8919 8920 return QualType(); 8921} 8922 8923EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 8924 EnumConstantDecl *LastEnumConst, 8925 SourceLocation IdLoc, 8926 IdentifierInfo *Id, 8927 Expr *Val) { 8928 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 8929 llvm::APSInt EnumVal(IntWidth); 8930 QualType EltTy; 8931 8932 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 8933 Val = 0; 8934 8935 if (Val) { 8936 if (Enum->isDependentType() || Val->isTypeDependent()) 8937 EltTy = Context.DependentTy; 8938 else { 8939 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 8940 SourceLocation ExpLoc; 8941 if (!Val->isValueDependent() && 8942 VerifyIntegerConstantExpression(Val, &EnumVal)) { 8943 Val = 0; 8944 } else { 8945 if (!getLangOptions().CPlusPlus) { 8946 // C99 6.7.2.2p2: 8947 // The expression that defines the value of an enumeration constant 8948 // shall be an integer constant expression that has a value 8949 // representable as an int. 8950 8951 // Complain if the value is not representable in an int. 8952 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 8953 Diag(IdLoc, diag::ext_enum_value_not_int) 8954 << EnumVal.toString(10) << Val->getSourceRange() 8955 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 8956 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 8957 // Force the type of the expression to 'int'. 8958 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 8959 } 8960 } 8961 8962 if (Enum->isFixed()) { 8963 EltTy = Enum->getIntegerType(); 8964 8965 // C++0x [dcl.enum]p5: 8966 // ... if the initializing value of an enumerator cannot be 8967 // represented by the underlying type, the program is ill-formed. 8968 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8969 if (getLangOptions().Microsoft) { 8970 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 8971 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8972 } else 8973 Diag(IdLoc, diag::err_enumerator_too_large) 8974 << EltTy; 8975 } else 8976 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8977 } 8978 else { 8979 // C++0x [dcl.enum]p5: 8980 // If the underlying type is not fixed, the type of each enumerator 8981 // is the type of its initializing value: 8982 // - If an initializer is specified for an enumerator, the 8983 // initializing value has the same type as the expression. 8984 EltTy = Val->getType(); 8985 } 8986 } 8987 } 8988 } 8989 8990 if (!Val) { 8991 if (Enum->isDependentType()) 8992 EltTy = Context.DependentTy; 8993 else if (!LastEnumConst) { 8994 // C++0x [dcl.enum]p5: 8995 // If the underlying type is not fixed, the type of each enumerator 8996 // is the type of its initializing value: 8997 // - If no initializer is specified for the first enumerator, the 8998 // initializing value has an unspecified integral type. 8999 // 9000 // GCC uses 'int' for its unspecified integral type, as does 9001 // C99 6.7.2.2p3. 9002 if (Enum->isFixed()) { 9003 EltTy = Enum->getIntegerType(); 9004 } 9005 else { 9006 EltTy = Context.IntTy; 9007 } 9008 } else { 9009 // Assign the last value + 1. 9010 EnumVal = LastEnumConst->getInitVal(); 9011 ++EnumVal; 9012 EltTy = LastEnumConst->getType(); 9013 9014 // Check for overflow on increment. 9015 if (EnumVal < LastEnumConst->getInitVal()) { 9016 // C++0x [dcl.enum]p5: 9017 // If the underlying type is not fixed, the type of each enumerator 9018 // is the type of its initializing value: 9019 // 9020 // - Otherwise the type of the initializing value is the same as 9021 // the type of the initializing value of the preceding enumerator 9022 // unless the incremented value is not representable in that type, 9023 // in which case the type is an unspecified integral type 9024 // sufficient to contain the incremented value. If no such type 9025 // exists, the program is ill-formed. 9026 QualType T = getNextLargerIntegralType(Context, EltTy); 9027 if (T.isNull() || Enum->isFixed()) { 9028 // There is no integral type larger enough to represent this 9029 // value. Complain, then allow the value to wrap around. 9030 EnumVal = LastEnumConst->getInitVal(); 9031 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9032 ++EnumVal; 9033 if (Enum->isFixed()) 9034 // When the underlying type is fixed, this is ill-formed. 9035 Diag(IdLoc, diag::err_enumerator_wrapped) 9036 << EnumVal.toString(10) 9037 << EltTy; 9038 else 9039 Diag(IdLoc, diag::warn_enumerator_too_large) 9040 << EnumVal.toString(10); 9041 } else { 9042 EltTy = T; 9043 } 9044 9045 // Retrieve the last enumerator's value, extent that type to the 9046 // type that is supposed to be large enough to represent the incremented 9047 // value, then increment. 9048 EnumVal = LastEnumConst->getInitVal(); 9049 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9050 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9051 ++EnumVal; 9052 9053 // If we're not in C++, diagnose the overflow of enumerator values, 9054 // which in C99 means that the enumerator value is not representable in 9055 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9056 // permits enumerator values that are representable in some larger 9057 // integral type. 9058 if (!getLangOptions().CPlusPlus && !T.isNull()) 9059 Diag(IdLoc, diag::warn_enum_value_overflow); 9060 } else if (!getLangOptions().CPlusPlus && 9061 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9062 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9063 Diag(IdLoc, diag::ext_enum_value_not_int) 9064 << EnumVal.toString(10) << 1; 9065 } 9066 } 9067 } 9068 9069 if (!EltTy->isDependentType()) { 9070 // Make the enumerator value match the signedness and size of the 9071 // enumerator's type. 9072 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9073 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9074 } 9075 9076 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9077 Val, EnumVal); 9078} 9079 9080 9081Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9082 SourceLocation IdLoc, IdentifierInfo *Id, 9083 AttributeList *Attr, 9084 SourceLocation EqualLoc, ExprTy *val) { 9085 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9086 EnumConstantDecl *LastEnumConst = 9087 cast_or_null<EnumConstantDecl>(lastEnumConst); 9088 Expr *Val = static_cast<Expr*>(val); 9089 9090 // The scope passed in may not be a decl scope. Zip up the scope tree until 9091 // we find one that is. 9092 S = getNonFieldDeclScope(S); 9093 9094 // Verify that there isn't already something declared with this name in this 9095 // scope. 9096 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9097 ForRedeclaration); 9098 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9099 // Maybe we will complain about the shadowed template parameter. 9100 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9101 // Just pretend that we didn't see the previous declaration. 9102 PrevDecl = 0; 9103 } 9104 9105 if (PrevDecl) { 9106 // When in C++, we may get a TagDecl with the same name; in this case the 9107 // enum constant will 'hide' the tag. 9108 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9109 "Received TagDecl when not in C++!"); 9110 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9111 if (isa<EnumConstantDecl>(PrevDecl)) 9112 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9113 else 9114 Diag(IdLoc, diag::err_redefinition) << Id; 9115 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9116 return 0; 9117 } 9118 } 9119 9120 // C++ [class.mem]p13: 9121 // If T is the name of a class, then each of the following shall have a 9122 // name different from T: 9123 // - every enumerator of every member of class T that is an enumerated 9124 // type 9125 if (CXXRecordDecl *Record 9126 = dyn_cast<CXXRecordDecl>( 9127 TheEnumDecl->getDeclContext()->getRedeclContext())) 9128 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9129 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9130 9131 EnumConstantDecl *New = 9132 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9133 9134 if (New) { 9135 // Process attributes. 9136 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9137 9138 // Register this decl in the current scope stack. 9139 New->setAccess(TheEnumDecl->getAccess()); 9140 PushOnScopeChains(New, S); 9141 } 9142 9143 return New; 9144} 9145 9146void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9147 SourceLocation RBraceLoc, Decl *EnumDeclX, 9148 Decl **Elements, unsigned NumElements, 9149 Scope *S, AttributeList *Attr) { 9150 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9151 QualType EnumType = Context.getTypeDeclType(Enum); 9152 9153 if (Attr) 9154 ProcessDeclAttributeList(S, Enum, Attr); 9155 9156 if (Enum->isDependentType()) { 9157 for (unsigned i = 0; i != NumElements; ++i) { 9158 EnumConstantDecl *ECD = 9159 cast_or_null<EnumConstantDecl>(Elements[i]); 9160 if (!ECD) continue; 9161 9162 ECD->setType(EnumType); 9163 } 9164 9165 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9166 return; 9167 } 9168 9169 // TODO: If the result value doesn't fit in an int, it must be a long or long 9170 // long value. ISO C does not support this, but GCC does as an extension, 9171 // emit a warning. 9172 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9173 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9174 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9175 9176 // Verify that all the values are okay, compute the size of the values, and 9177 // reverse the list. 9178 unsigned NumNegativeBits = 0; 9179 unsigned NumPositiveBits = 0; 9180 9181 // Keep track of whether all elements have type int. 9182 bool AllElementsInt = true; 9183 9184 for (unsigned i = 0; i != NumElements; ++i) { 9185 EnumConstantDecl *ECD = 9186 cast_or_null<EnumConstantDecl>(Elements[i]); 9187 if (!ECD) continue; // Already issued a diagnostic. 9188 9189 const llvm::APSInt &InitVal = ECD->getInitVal(); 9190 9191 // Keep track of the size of positive and negative values. 9192 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9193 NumPositiveBits = std::max(NumPositiveBits, 9194 (unsigned)InitVal.getActiveBits()); 9195 else 9196 NumNegativeBits = std::max(NumNegativeBits, 9197 (unsigned)InitVal.getMinSignedBits()); 9198 9199 // Keep track of whether every enum element has type int (very commmon). 9200 if (AllElementsInt) 9201 AllElementsInt = ECD->getType() == Context.IntTy; 9202 } 9203 9204 // Figure out the type that should be used for this enum. 9205 QualType BestType; 9206 unsigned BestWidth; 9207 9208 // C++0x N3000 [conv.prom]p3: 9209 // An rvalue of an unscoped enumeration type whose underlying 9210 // type is not fixed can be converted to an rvalue of the first 9211 // of the following types that can represent all the values of 9212 // the enumeration: int, unsigned int, long int, unsigned long 9213 // int, long long int, or unsigned long long int. 9214 // C99 6.4.4.3p2: 9215 // An identifier declared as an enumeration constant has type int. 9216 // The C99 rule is modified by a gcc extension 9217 QualType BestPromotionType; 9218 9219 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9220 // -fshort-enums is the equivalent to specifying the packed attribute on all 9221 // enum definitions. 9222 if (LangOpts.ShortEnums) 9223 Packed = true; 9224 9225 if (Enum->isFixed()) { 9226 BestType = BestPromotionType = Enum->getIntegerType(); 9227 // We don't need to set BestWidth, because BestType is going to be the type 9228 // of the enumerators, but we do anyway because otherwise some compilers 9229 // warn that it might be used uninitialized. 9230 BestWidth = CharWidth; 9231 } 9232 else if (NumNegativeBits) { 9233 // If there is a negative value, figure out the smallest integer type (of 9234 // int/long/longlong) that fits. 9235 // If it's packed, check also if it fits a char or a short. 9236 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9237 BestType = Context.SignedCharTy; 9238 BestWidth = CharWidth; 9239 } else if (Packed && NumNegativeBits <= ShortWidth && 9240 NumPositiveBits < ShortWidth) { 9241 BestType = Context.ShortTy; 9242 BestWidth = ShortWidth; 9243 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9244 BestType = Context.IntTy; 9245 BestWidth = IntWidth; 9246 } else { 9247 BestWidth = Context.getTargetInfo().getLongWidth(); 9248 9249 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9250 BestType = Context.LongTy; 9251 } else { 9252 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9253 9254 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9255 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9256 BestType = Context.LongLongTy; 9257 } 9258 } 9259 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9260 } else { 9261 // If there is no negative value, figure out the smallest type that fits 9262 // all of the enumerator values. 9263 // If it's packed, check also if it fits a char or a short. 9264 if (Packed && NumPositiveBits <= CharWidth) { 9265 BestType = Context.UnsignedCharTy; 9266 BestPromotionType = Context.IntTy; 9267 BestWidth = CharWidth; 9268 } else if (Packed && NumPositiveBits <= ShortWidth) { 9269 BestType = Context.UnsignedShortTy; 9270 BestPromotionType = Context.IntTy; 9271 BestWidth = ShortWidth; 9272 } else if (NumPositiveBits <= IntWidth) { 9273 BestType = Context.UnsignedIntTy; 9274 BestWidth = IntWidth; 9275 BestPromotionType 9276 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9277 ? Context.UnsignedIntTy : Context.IntTy; 9278 } else if (NumPositiveBits <= 9279 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9280 BestType = Context.UnsignedLongTy; 9281 BestPromotionType 9282 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9283 ? Context.UnsignedLongTy : Context.LongTy; 9284 } else { 9285 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9286 assert(NumPositiveBits <= BestWidth && 9287 "How could an initializer get larger than ULL?"); 9288 BestType = Context.UnsignedLongLongTy; 9289 BestPromotionType 9290 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9291 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9292 } 9293 } 9294 9295 // Loop over all of the enumerator constants, changing their types to match 9296 // the type of the enum if needed. 9297 for (unsigned i = 0; i != NumElements; ++i) { 9298 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9299 if (!ECD) continue; // Already issued a diagnostic. 9300 9301 // Standard C says the enumerators have int type, but we allow, as an 9302 // extension, the enumerators to be larger than int size. If each 9303 // enumerator value fits in an int, type it as an int, otherwise type it the 9304 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9305 // that X has type 'int', not 'unsigned'. 9306 9307 // Determine whether the value fits into an int. 9308 llvm::APSInt InitVal = ECD->getInitVal(); 9309 9310 // If it fits into an integer type, force it. Otherwise force it to match 9311 // the enum decl type. 9312 QualType NewTy; 9313 unsigned NewWidth; 9314 bool NewSign; 9315 if (!getLangOptions().CPlusPlus && 9316 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9317 NewTy = Context.IntTy; 9318 NewWidth = IntWidth; 9319 NewSign = true; 9320 } else if (ECD->getType() == BestType) { 9321 // Already the right type! 9322 if (getLangOptions().CPlusPlus) 9323 // C++ [dcl.enum]p4: Following the closing brace of an 9324 // enum-specifier, each enumerator has the type of its 9325 // enumeration. 9326 ECD->setType(EnumType); 9327 continue; 9328 } else { 9329 NewTy = BestType; 9330 NewWidth = BestWidth; 9331 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9332 } 9333 9334 // Adjust the APSInt value. 9335 InitVal = InitVal.extOrTrunc(NewWidth); 9336 InitVal.setIsSigned(NewSign); 9337 ECD->setInitVal(InitVal); 9338 9339 // Adjust the Expr initializer and type. 9340 if (ECD->getInitExpr() && 9341 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9342 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9343 CK_IntegralCast, 9344 ECD->getInitExpr(), 9345 /*base paths*/ 0, 9346 VK_RValue)); 9347 if (getLangOptions().CPlusPlus) 9348 // C++ [dcl.enum]p4: Following the closing brace of an 9349 // enum-specifier, each enumerator has the type of its 9350 // enumeration. 9351 ECD->setType(EnumType); 9352 else 9353 ECD->setType(NewTy); 9354 } 9355 9356 Enum->completeDefinition(BestType, BestPromotionType, 9357 NumPositiveBits, NumNegativeBits); 9358} 9359 9360Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9361 SourceLocation StartLoc, 9362 SourceLocation EndLoc) { 9363 StringLiteral *AsmString = cast<StringLiteral>(expr); 9364 9365 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9366 AsmString, StartLoc, 9367 EndLoc); 9368 CurContext->addDecl(New); 9369 return New; 9370} 9371 9372DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9373 IdentifierInfo &ModuleName, 9374 SourceLocation ModuleNameLoc) { 9375 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9376 ModuleName, ModuleNameLoc); 9377 if (!Module) 9378 return true; 9379 9380 // FIXME: Actually create a declaration to describe the module import. 9381 (void)Module; 9382 return DeclResult((Decl *)0); 9383} 9384 9385void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9386 SourceLocation PragmaLoc, 9387 SourceLocation NameLoc) { 9388 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9389 9390 if (PrevDecl) { 9391 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9392 } else { 9393 (void)WeakUndeclaredIdentifiers.insert( 9394 std::pair<IdentifierInfo*,WeakInfo> 9395 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9396 } 9397} 9398 9399void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9400 IdentifierInfo* AliasName, 9401 SourceLocation PragmaLoc, 9402 SourceLocation NameLoc, 9403 SourceLocation AliasNameLoc) { 9404 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9405 LookupOrdinaryName); 9406 WeakInfo W = WeakInfo(Name, NameLoc); 9407 9408 if (PrevDecl) { 9409 if (!PrevDecl->hasAttr<AliasAttr>()) 9410 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9411 DeclApplyPragmaWeak(TUScope, ND, W); 9412 } else { 9413 (void)WeakUndeclaredIdentifiers.insert( 9414 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9415 } 9416} 9417 9418Decl *Sema::getObjCDeclContext() const { 9419 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9420} 9421