SemaDecl.cpp revision 24c38e1ff057ce49c866294bf486444255e18f31
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 "llvm/ADT/Triple.h" 42#include <algorithm> 43#include <cstring> 44#include <functional> 45using namespace clang; 46using namespace sema; 47 48Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr) { 49 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 50} 51 52/// \brief If the identifier refers to a type name within this scope, 53/// return the declaration of that type. 54/// 55/// This routine performs ordinary name lookup of the identifier II 56/// within the given scope, with optional C++ scope specifier SS, to 57/// determine whether the name refers to a type. If so, returns an 58/// opaque pointer (actually a QualType) corresponding to that 59/// type. Otherwise, returns NULL. 60/// 61/// If name lookup results in an ambiguity, this routine will complain 62/// and then return NULL. 63ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 64 Scope *S, CXXScopeSpec *SS, 65 bool isClassName, bool HasTrailingDot, 66 ParsedType ObjectTypePtr, 67 bool WantNontrivialTypeSourceInfo) { 68 // Determine where we will perform name lookup. 69 DeclContext *LookupCtx = 0; 70 if (ObjectTypePtr) { 71 QualType ObjectType = ObjectTypePtr.get(); 72 if (ObjectType->isRecordType()) 73 LookupCtx = computeDeclContext(ObjectType); 74 } else if (SS && SS->isNotEmpty()) { 75 LookupCtx = computeDeclContext(*SS, false); 76 77 if (!LookupCtx) { 78 if (isDependentScopeSpecifier(*SS)) { 79 // C++ [temp.res]p3: 80 // A qualified-id that refers to a type and in which the 81 // nested-name-specifier depends on a template-parameter (14.6.2) 82 // shall be prefixed by the keyword typename to indicate that the 83 // qualified-id denotes a type, forming an 84 // elaborated-type-specifier (7.1.5.3). 85 // 86 // We therefore do not perform any name lookup if the result would 87 // refer to a member of an unknown specialization. 88 if (!isClassName) 89 return ParsedType(); 90 91 // We know from the grammar that this name refers to a type, 92 // so build a dependent node to describe the type. 93 if (WantNontrivialTypeSourceInfo) 94 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 95 96 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 97 QualType T = 98 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 99 II, NameLoc); 100 101 return ParsedType::make(T); 102 } 103 104 return ParsedType(); 105 } 106 107 if (!LookupCtx->isDependentContext() && 108 RequireCompleteDeclContext(*SS, LookupCtx)) 109 return ParsedType(); 110 } 111 112 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 113 // lookup for class-names. 114 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 115 LookupOrdinaryName; 116 LookupResult Result(*this, &II, NameLoc, Kind); 117 if (LookupCtx) { 118 // Perform "qualified" name lookup into the declaration context we 119 // computed, which is either the type of the base of a member access 120 // expression or the declaration context associated with a prior 121 // nested-name-specifier. 122 LookupQualifiedName(Result, LookupCtx); 123 124 if (ObjectTypePtr && Result.empty()) { 125 // C++ [basic.lookup.classref]p3: 126 // If the unqualified-id is ~type-name, the type-name is looked up 127 // in the context of the entire postfix-expression. If the type T of 128 // the object expression is of a class type C, the type-name is also 129 // looked up in the scope of class C. At least one of the lookups shall 130 // find a name that refers to (possibly cv-qualified) T. 131 LookupName(Result, S); 132 } 133 } else { 134 // Perform unqualified name lookup. 135 LookupName(Result, S); 136 } 137 138 NamedDecl *IIDecl = 0; 139 switch (Result.getResultKind()) { 140 case LookupResult::NotFound: 141 case LookupResult::NotFoundInCurrentInstantiation: 142 case LookupResult::FoundOverloaded: 143 case LookupResult::FoundUnresolvedValue: 144 Result.suppressDiagnostics(); 145 return ParsedType(); 146 147 case LookupResult::Ambiguous: 148 // Recover from type-hiding ambiguities by hiding the type. We'll 149 // do the lookup again when looking for an object, and we can 150 // diagnose the error then. If we don't do this, then the error 151 // about hiding the type will be immediately followed by an error 152 // that only makes sense if the identifier was treated like a type. 153 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 154 Result.suppressDiagnostics(); 155 return ParsedType(); 156 } 157 158 // Look to see if we have a type anywhere in the list of results. 159 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 160 Res != ResEnd; ++Res) { 161 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 162 if (!IIDecl || 163 (*Res)->getLocation().getRawEncoding() < 164 IIDecl->getLocation().getRawEncoding()) 165 IIDecl = *Res; 166 } 167 } 168 169 if (!IIDecl) { 170 // None of the entities we found is a type, so there is no way 171 // to even assume that the result is a type. In this case, don't 172 // complain about the ambiguity. The parser will either try to 173 // perform this lookup again (e.g., as an object name), which 174 // will produce the ambiguity, or will complain that it expected 175 // a type name. 176 Result.suppressDiagnostics(); 177 return ParsedType(); 178 } 179 180 // We found a type within the ambiguous lookup; diagnose the 181 // ambiguity and then return that type. This might be the right 182 // answer, or it might not be, but it suppresses any attempt to 183 // perform the name lookup again. 184 break; 185 186 case LookupResult::Found: 187 IIDecl = Result.getFoundDecl(); 188 break; 189 } 190 191 assert(IIDecl && "Didn't find decl"); 192 193 QualType T; 194 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 195 DiagnoseUseOfDecl(IIDecl, NameLoc); 196 197 if (T.isNull()) 198 T = Context.getTypeDeclType(TD); 199 200 if (SS && SS->isNotEmpty()) { 201 if (WantNontrivialTypeSourceInfo) { 202 // Construct a type with type-source information. 203 TypeLocBuilder Builder; 204 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 205 206 T = getElaboratedType(ETK_None, *SS, T); 207 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 208 ElabTL.setKeywordLoc(SourceLocation()); 209 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 210 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 211 } else { 212 T = getElaboratedType(ETK_None, *SS, T); 213 } 214 } 215 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 216 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 217 if (!HasTrailingDot) 218 T = Context.getObjCInterfaceType(IDecl); 219 } 220 221 if (T.isNull()) { 222 // If it's not plausibly a type, suppress diagnostics. 223 Result.suppressDiagnostics(); 224 return ParsedType(); 225 } 226 return ParsedType::make(T); 227} 228 229/// isTagName() - This method is called *for error recovery purposes only* 230/// to determine if the specified name is a valid tag name ("struct foo"). If 231/// so, this returns the TST for the tag corresponding to it (TST_enum, 232/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 233/// where the user forgot to specify the tag. 234DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 235 // Do a tag name lookup in this scope. 236 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 237 LookupName(R, S, false); 238 R.suppressDiagnostics(); 239 if (R.getResultKind() == LookupResult::Found) 240 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 241 switch (TD->getTagKind()) { 242 default: return DeclSpec::TST_unspecified; 243 case TTK_Struct: return DeclSpec::TST_struct; 244 case TTK_Union: return DeclSpec::TST_union; 245 case TTK_Class: return DeclSpec::TST_class; 246 case TTK_Enum: return DeclSpec::TST_enum; 247 } 248 } 249 250 return DeclSpec::TST_unspecified; 251} 252 253/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 254/// if a CXXScopeSpec's type is equal to the type of one of the base classes 255/// then downgrade the missing typename error to a warning. 256/// This is needed for MSVC compatibility; Example: 257/// @code 258/// template<class T> class A { 259/// public: 260/// typedef int TYPE; 261/// }; 262/// template<class T> class B : public A<T> { 263/// public: 264/// A<T>::TYPE a; // no typename required because A<T> is a base class. 265/// }; 266/// @endcode 267bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 268 if (CurContext->isRecord()) { 269 const Type *Ty = SS->getScopeRep()->getAsType(); 270 271 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 272 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 273 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 274 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 275 return true; 276 } 277 return false; 278} 279 280bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 281 SourceLocation IILoc, 282 Scope *S, 283 CXXScopeSpec *SS, 284 ParsedType &SuggestedType) { 285 // We don't have anything to suggest (yet). 286 SuggestedType = ParsedType(); 287 288 // There may have been a typo in the name of the type. Look up typo 289 // results, in case we have something that we can suggest. 290 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 291 NotForRedeclaration); 292 293 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 294 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 295 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 296 !Result->isInvalidDecl()) { 297 // We found a similarly-named type or interface; suggest that. 298 if (!SS || !SS->isSet()) 299 Diag(IILoc, diag::err_unknown_typename_suggest) 300 << &II << Lookup.getLookupName() 301 << FixItHint::CreateReplacement(SourceRange(IILoc), 302 Result->getNameAsString()); 303 else if (DeclContext *DC = computeDeclContext(*SS, false)) 304 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 305 << &II << DC << Lookup.getLookupName() << SS->getRange() 306 << FixItHint::CreateReplacement(SourceRange(IILoc), 307 Result->getNameAsString()); 308 else 309 llvm_unreachable("could not have corrected a typo here"); 310 311 Diag(Result->getLocation(), diag::note_previous_decl) 312 << Result->getDeclName(); 313 314 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 315 false, false, ParsedType(), 316 /*NonTrivialTypeSourceInfo=*/true); 317 return true; 318 } 319 } else if (Lookup.empty()) { 320 // We corrected to a keyword. 321 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 322 Diag(IILoc, diag::err_unknown_typename_suggest) 323 << &II << Corrected; 324 return true; 325 } 326 } 327 328 if (getLangOptions().CPlusPlus) { 329 // See if II is a class template that the user forgot to pass arguments to. 330 UnqualifiedId Name; 331 Name.setIdentifier(&II, IILoc); 332 CXXScopeSpec EmptySS; 333 TemplateTy TemplateResult; 334 bool MemberOfUnknownSpecialization; 335 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 336 Name, ParsedType(), true, TemplateResult, 337 MemberOfUnknownSpecialization) == TNK_Type_template) { 338 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 339 Diag(IILoc, diag::err_template_missing_args) << TplName; 340 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 341 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 342 << TplDecl->getTemplateParameters()->getSourceRange(); 343 } 344 return true; 345 } 346 } 347 348 // FIXME: Should we move the logic that tries to recover from a missing tag 349 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 350 351 if (!SS || (!SS->isSet() && !SS->isInvalid())) 352 Diag(IILoc, diag::err_unknown_typename) << &II; 353 else if (DeclContext *DC = computeDeclContext(*SS, false)) 354 Diag(IILoc, diag::err_typename_nested_not_found) 355 << &II << DC << SS->getRange(); 356 else if (isDependentScopeSpecifier(*SS)) { 357 unsigned DiagID = diag::err_typename_missing; 358 if (getLangOptions().Microsoft && isMicrosoftMissingTypename(SS)) 359 DiagID = diag::warn_typename_missing; 360 361 Diag(SS->getRange().getBegin(), DiagID) 362 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 363 << SourceRange(SS->getRange().getBegin(), IILoc) 364 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 365 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 366 } else { 367 assert(SS && SS->isInvalid() && 368 "Invalid scope specifier has already been diagnosed"); 369 } 370 371 return true; 372} 373 374/// \brief Determine whether the given result set contains either a type name 375/// or 376static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 377 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 378 NextToken.is(tok::less); 379 380 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 381 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 382 return true; 383 384 if (CheckTemplate && isa<TemplateDecl>(*I)) 385 return true; 386 } 387 388 return false; 389} 390 391Sema::NameClassification Sema::ClassifyName(Scope *S, 392 CXXScopeSpec &SS, 393 IdentifierInfo *&Name, 394 SourceLocation NameLoc, 395 const Token &NextToken) { 396 DeclarationNameInfo NameInfo(Name, NameLoc); 397 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 398 399 if (NextToken.is(tok::coloncolon)) { 400 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 401 QualType(), false, SS, 0, false); 402 403 } 404 405 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 406 LookupParsedName(Result, S, &SS, !CurMethod); 407 408 // Perform lookup for Objective-C instance variables (including automatically 409 // synthesized instance variables), if we're in an Objective-C method. 410 // FIXME: This lookup really, really needs to be folded in to the normal 411 // unqualified lookup mechanism. 412 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 413 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 414 if (E.get() || E.isInvalid()) 415 return E; 416 417 // Synthesize ivars lazily. 418 if (getLangOptions().ObjCDefaultSynthProperties && 419 getLangOptions().ObjCNonFragileABI2) { 420 if (SynthesizeProvisionalIvar(Result, Name, NameLoc)) { 421 if (const ObjCPropertyDecl *Property = 422 canSynthesizeProvisionalIvar(Name)) { 423 Diag(NameLoc, diag::warn_synthesized_ivar_access) << Name; 424 Diag(Property->getLocation(), diag::note_property_declare); 425 } 426 427 // FIXME: This is strange. Shouldn't we just take the ivar returned 428 // from SynthesizeProvisionalIvar and continue with that? 429 E = LookupInObjCMethod(Result, S, Name, true); 430 if (E.get() || E.isInvalid()) 431 return E; 432 } 433 } 434 } 435 436 bool SecondTry = false; 437 bool IsFilteredTemplateName = false; 438 439Corrected: 440 switch (Result.getResultKind()) { 441 case LookupResult::NotFound: 442 // If an unqualified-id is followed by a '(', then we have a function 443 // call. 444 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 445 // In C++, this is an ADL-only call. 446 // FIXME: Reference? 447 if (getLangOptions().CPlusPlus) 448 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 449 450 // C90 6.3.2.2: 451 // If the expression that precedes the parenthesized argument list in a 452 // function call consists solely of an identifier, and if no 453 // declaration is visible for this identifier, the identifier is 454 // implicitly declared exactly as if, in the innermost block containing 455 // the function call, the declaration 456 // 457 // extern int identifier (); 458 // 459 // appeared. 460 // 461 // We also allow this in C99 as an extension. 462 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 463 Result.addDecl(D); 464 Result.resolveKind(); 465 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 466 } 467 } 468 469 // In C, we first see whether there is a tag type by the same name, in 470 // which case it's likely that the user just forget to write "enum", 471 // "struct", or "union". 472 if (!getLangOptions().CPlusPlus && !SecondTry) { 473 Result.clear(LookupTagName); 474 LookupParsedName(Result, S, &SS); 475 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 476 const char *TagName = 0; 477 const char *FixItTagName = 0; 478 switch (Tag->getTagKind()) { 479 case TTK_Class: 480 TagName = "class"; 481 FixItTagName = "class "; 482 break; 483 484 case TTK_Enum: 485 TagName = "enum"; 486 FixItTagName = "enum "; 487 break; 488 489 case TTK_Struct: 490 TagName = "struct"; 491 FixItTagName = "struct "; 492 break; 493 494 case TTK_Union: 495 TagName = "union"; 496 FixItTagName = "union "; 497 break; 498 } 499 500 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 501 << Name << TagName << getLangOptions().CPlusPlus 502 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 503 break; 504 } 505 506 Result.clear(LookupOrdinaryName); 507 } 508 509 // Perform typo correction to determine if there is another name that is 510 // close to this name. 511 if (!SecondTry) { 512 if (DeclarationName Corrected = CorrectTypo(Result, S, &SS)) { 513 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 514 unsigned QualifiedDiag = diag::err_no_member_suggest; 515 516 NamedDecl *FirstDecl = Result.empty()? 0 : *Result.begin(); 517 NamedDecl *UnderlyingFirstDecl 518 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 519 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 520 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 521 UnqualifiedDiag = diag::err_no_template_suggest; 522 QualifiedDiag = diag::err_no_member_template_suggest; 523 } else if (UnderlyingFirstDecl && 524 (isa<TypeDecl>(UnderlyingFirstDecl) || 525 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 526 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 527 UnqualifiedDiag = diag::err_unknown_typename_suggest; 528 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 529 } 530 531 if (SS.isEmpty()) 532 Diag(NameLoc, UnqualifiedDiag) 533 << Name << Corrected 534 << FixItHint::CreateReplacement(NameLoc, Corrected.getAsString()); 535 else 536 Diag(NameLoc, QualifiedDiag) 537 << Name << computeDeclContext(SS, false) << Corrected 538 << SS.getRange() 539 << FixItHint::CreateReplacement(NameLoc, Corrected.getAsString()); 540 541 // Update the name, so that the caller has the new name. 542 Name = Corrected.getAsIdentifierInfo(); 543 544 // Typo correction corrected to a keyword. 545 if (Result.empty()) 546 return Corrected.getAsIdentifierInfo(); 547 548 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 549 << FirstDecl->getDeclName(); 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 // ObjCMethodDecls are parsed (for some reason) outside the context 724 // of the class. 725 if (isa<ObjCMethodDecl>(DC)) 726 return DC->getLexicalParent()->getLexicalParent(); 727 728 return DC->getLexicalParent(); 729} 730 731void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 732 assert(getContainingDC(DC) == CurContext && 733 "The next DeclContext should be lexically contained in the current one."); 734 CurContext = DC; 735 S->setEntity(DC); 736} 737 738void Sema::PopDeclContext() { 739 assert(CurContext && "DeclContext imbalance!"); 740 741 CurContext = getContainingDC(CurContext); 742 assert(CurContext && "Popped translation unit!"); 743} 744 745/// EnterDeclaratorContext - Used when we must lookup names in the context 746/// of a declarator's nested name specifier. 747/// 748void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 749 // C++0x [basic.lookup.unqual]p13: 750 // A name used in the definition of a static data member of class 751 // X (after the qualified-id of the static member) is looked up as 752 // if the name was used in a member function of X. 753 // C++0x [basic.lookup.unqual]p14: 754 // If a variable member of a namespace is defined outside of the 755 // scope of its namespace then any name used in the definition of 756 // the variable member (after the declarator-id) is looked up as 757 // if the definition of the variable member occurred in its 758 // namespace. 759 // Both of these imply that we should push a scope whose context 760 // is the semantic context of the declaration. We can't use 761 // PushDeclContext here because that context is not necessarily 762 // lexically contained in the current context. Fortunately, 763 // the containing scope should have the appropriate information. 764 765 assert(!S->getEntity() && "scope already has entity"); 766 767#ifndef NDEBUG 768 Scope *Ancestor = S->getParent(); 769 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 770 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 771#endif 772 773 CurContext = DC; 774 S->setEntity(DC); 775} 776 777void Sema::ExitDeclaratorContext(Scope *S) { 778 assert(S->getEntity() == CurContext && "Context imbalance!"); 779 780 // Switch back to the lexical context. The safety of this is 781 // enforced by an assert in EnterDeclaratorContext. 782 Scope *Ancestor = S->getParent(); 783 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 784 CurContext = (DeclContext*) Ancestor->getEntity(); 785 786 // We don't need to do anything with the scope, which is going to 787 // disappear. 788} 789 790/// \brief Determine whether we allow overloading of the function 791/// PrevDecl with another declaration. 792/// 793/// This routine determines whether overloading is possible, not 794/// whether some new function is actually an overload. It will return 795/// true in C++ (where we can always provide overloads) or, as an 796/// extension, in C when the previous function is already an 797/// overloaded function declaration or has the "overloadable" 798/// attribute. 799static bool AllowOverloadingOfFunction(LookupResult &Previous, 800 ASTContext &Context) { 801 if (Context.getLangOptions().CPlusPlus) 802 return true; 803 804 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 805 return true; 806 807 return (Previous.getResultKind() == LookupResult::Found 808 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 809} 810 811/// Add this decl to the scope shadowed decl chains. 812void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 813 // Move up the scope chain until we find the nearest enclosing 814 // non-transparent context. The declaration will be introduced into this 815 // scope. 816 while (S->getEntity() && 817 ((DeclContext *)S->getEntity())->isTransparentContext()) 818 S = S->getParent(); 819 820 // Add scoped declarations into their context, so that they can be 821 // found later. Declarations without a context won't be inserted 822 // into any context. 823 if (AddToContext) 824 CurContext->addDecl(D); 825 826 // Out-of-line definitions shouldn't be pushed into scope in C++. 827 // Out-of-line variable and function definitions shouldn't even in C. 828 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 829 D->isOutOfLine()) 830 return; 831 832 // Template instantiations should also not be pushed into scope. 833 if (isa<FunctionDecl>(D) && 834 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 835 return; 836 837 // If this replaces anything in the current scope, 838 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 839 IEnd = IdResolver.end(); 840 for (; I != IEnd; ++I) { 841 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 842 S->RemoveDecl(*I); 843 IdResolver.RemoveDecl(*I); 844 845 // Should only need to replace one decl. 846 break; 847 } 848 } 849 850 S->AddDecl(D); 851 852 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 853 // Implicitly-generated labels may end up getting generated in an order that 854 // isn't strictly lexical, which breaks name lookup. Be careful to insert 855 // the label at the appropriate place in the identifier chain. 856 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 857 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 858 if (IDC == CurContext) { 859 if (!S->isDeclScope(*I)) 860 continue; 861 } else if (IDC->Encloses(CurContext)) 862 break; 863 } 864 865 IdResolver.InsertDeclAfter(I, D); 866 } else { 867 IdResolver.AddDecl(D); 868 } 869} 870 871bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 872 bool ExplicitInstantiationOrSpecialization) { 873 return IdResolver.isDeclInScope(D, Ctx, Context, S, 874 ExplicitInstantiationOrSpecialization); 875} 876 877Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 878 DeclContext *TargetDC = DC->getPrimaryContext(); 879 do { 880 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 881 if (ScopeDC->getPrimaryContext() == TargetDC) 882 return S; 883 } while ((S = S->getParent())); 884 885 return 0; 886} 887 888static bool isOutOfScopePreviousDeclaration(NamedDecl *, 889 DeclContext*, 890 ASTContext&); 891 892/// Filters out lookup results that don't fall within the given scope 893/// as determined by isDeclInScope. 894void Sema::FilterLookupForScope(LookupResult &R, 895 DeclContext *Ctx, Scope *S, 896 bool ConsiderLinkage, 897 bool ExplicitInstantiationOrSpecialization) { 898 LookupResult::Filter F = R.makeFilter(); 899 while (F.hasNext()) { 900 NamedDecl *D = F.next(); 901 902 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 903 continue; 904 905 if (ConsiderLinkage && 906 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 907 continue; 908 909 F.erase(); 910 } 911 912 F.done(); 913} 914 915static bool isUsingDecl(NamedDecl *D) { 916 return isa<UsingShadowDecl>(D) || 917 isa<UnresolvedUsingTypenameDecl>(D) || 918 isa<UnresolvedUsingValueDecl>(D); 919} 920 921/// Removes using shadow declarations from the lookup results. 922static void RemoveUsingDecls(LookupResult &R) { 923 LookupResult::Filter F = R.makeFilter(); 924 while (F.hasNext()) 925 if (isUsingDecl(F.next())) 926 F.erase(); 927 928 F.done(); 929} 930 931/// \brief Check for this common pattern: 932/// @code 933/// class S { 934/// S(const S&); // DO NOT IMPLEMENT 935/// void operator=(const S&); // DO NOT IMPLEMENT 936/// }; 937/// @endcode 938static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 939 // FIXME: Should check for private access too but access is set after we get 940 // the decl here. 941 if (D->doesThisDeclarationHaveABody()) 942 return false; 943 944 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 945 return CD->isCopyConstructor(); 946 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 947 return Method->isCopyAssignmentOperator(); 948 return false; 949} 950 951bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 952 assert(D); 953 954 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 955 return false; 956 957 // Ignore class templates. 958 if (D->getDeclContext()->isDependentContext() || 959 D->getLexicalDeclContext()->isDependentContext()) 960 return false; 961 962 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 963 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 964 return false; 965 966 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 967 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 968 return false; 969 } else { 970 // 'static inline' functions are used in headers; don't warn. 971 if (FD->getStorageClass() == SC_Static && 972 FD->isInlineSpecified()) 973 return false; 974 } 975 976 if (FD->doesThisDeclarationHaveABody() && 977 Context.DeclMustBeEmitted(FD)) 978 return false; 979 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 980 if (!VD->isFileVarDecl() || 981 VD->getType().isConstant(Context) || 982 Context.DeclMustBeEmitted(VD)) 983 return false; 984 985 if (VD->isStaticDataMember() && 986 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 987 return false; 988 989 } else { 990 return false; 991 } 992 993 // Only warn for unused decls internal to the translation unit. 994 if (D->getLinkage() == ExternalLinkage) 995 return false; 996 997 return true; 998} 999 1000void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1001 if (!D) 1002 return; 1003 1004 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1005 const FunctionDecl *First = FD->getFirstDeclaration(); 1006 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1007 return; // First should already be in the vector. 1008 } 1009 1010 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1011 const VarDecl *First = VD->getFirstDeclaration(); 1012 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1013 return; // First should already be in the vector. 1014 } 1015 1016 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1017 UnusedFileScopedDecls.push_back(D); 1018 } 1019 1020static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1021 if (D->isInvalidDecl()) 1022 return false; 1023 1024 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1025 return false; 1026 1027 if (isa<LabelDecl>(D)) 1028 return true; 1029 1030 // White-list anything that isn't a local variable. 1031 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1032 !D->getDeclContext()->isFunctionOrMethod()) 1033 return false; 1034 1035 // Types of valid local variables should be complete, so this should succeed. 1036 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1037 1038 // White-list anything with an __attribute__((unused)) type. 1039 QualType Ty = VD->getType(); 1040 1041 // Only look at the outermost level of typedef. 1042 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1043 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1044 return false; 1045 } 1046 1047 // If we failed to complete the type for some reason, or if the type is 1048 // dependent, don't diagnose the variable. 1049 if (Ty->isIncompleteType() || Ty->isDependentType()) 1050 return false; 1051 1052 if (const TagType *TT = Ty->getAs<TagType>()) { 1053 const TagDecl *Tag = TT->getDecl(); 1054 if (Tag->hasAttr<UnusedAttr>()) 1055 return false; 1056 1057 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1058 // FIXME: Checking for the presence of a user-declared constructor 1059 // isn't completely accurate; we'd prefer to check that the initializer 1060 // has no side effects. 1061 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1062 return false; 1063 } 1064 } 1065 1066 // TODO: __attribute__((unused)) templates? 1067 } 1068 1069 return true; 1070} 1071 1072/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1073/// unless they are marked attr(unused). 1074void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1075 if (!ShouldDiagnoseUnusedDecl(D)) 1076 return; 1077 1078 unsigned DiagID; 1079 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1080 DiagID = diag::warn_unused_exception_param; 1081 else if (isa<LabelDecl>(D)) 1082 DiagID = diag::warn_unused_label; 1083 else 1084 DiagID = diag::warn_unused_variable; 1085 1086 Diag(D->getLocation(), DiagID) << D->getDeclName(); 1087} 1088 1089static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1090 // Verify that we have no forward references left. If so, there was a goto 1091 // or address of a label taken, but no definition of it. Label fwd 1092 // definitions are indicated with a null substmt. 1093 if (L->getStmt() == 0) 1094 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1095} 1096 1097void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1098 if (S->decl_empty()) return; 1099 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1100 "Scope shouldn't contain decls!"); 1101 1102 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1103 I != E; ++I) { 1104 Decl *TmpD = (*I); 1105 assert(TmpD && "This decl didn't get pushed??"); 1106 1107 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1108 NamedDecl *D = cast<NamedDecl>(TmpD); 1109 1110 if (!D->getDeclName()) continue; 1111 1112 // Diagnose unused variables in this scope. 1113 if (!S->hasErrorOccurred()) 1114 DiagnoseUnusedDecl(D); 1115 1116 // If this was a forward reference to a label, verify it was defined. 1117 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1118 CheckPoppedLabel(LD, *this); 1119 1120 // Remove this name from our lexical scope. 1121 IdResolver.RemoveDecl(D); 1122 } 1123} 1124 1125/// \brief Look for an Objective-C class in the translation unit. 1126/// 1127/// \param Id The name of the Objective-C class we're looking for. If 1128/// typo-correction fixes this name, the Id will be updated 1129/// to the fixed name. 1130/// 1131/// \param IdLoc The location of the name in the translation unit. 1132/// 1133/// \param TypoCorrection If true, this routine will attempt typo correction 1134/// if there is no class with the given name. 1135/// 1136/// \returns The declaration of the named Objective-C class, or NULL if the 1137/// class could not be found. 1138ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1139 SourceLocation IdLoc, 1140 bool TypoCorrection) { 1141 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1142 // creation from this context. 1143 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1144 1145 if (!IDecl && TypoCorrection) { 1146 // Perform typo correction at the given location, but only if we 1147 // find an Objective-C class name. 1148 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 1149 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 1150 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 1151 Diag(IdLoc, diag::err_undef_interface_suggest) 1152 << Id << IDecl->getDeclName() 1153 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1154 Diag(IDecl->getLocation(), diag::note_previous_decl) 1155 << IDecl->getDeclName(); 1156 1157 Id = IDecl->getIdentifier(); 1158 } 1159 } 1160 1161 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1162} 1163 1164/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1165/// from S, where a non-field would be declared. This routine copes 1166/// with the difference between C and C++ scoping rules in structs and 1167/// unions. For example, the following code is well-formed in C but 1168/// ill-formed in C++: 1169/// @code 1170/// struct S6 { 1171/// enum { BAR } e; 1172/// }; 1173/// 1174/// void test_S6() { 1175/// struct S6 a; 1176/// a.e = BAR; 1177/// } 1178/// @endcode 1179/// For the declaration of BAR, this routine will return a different 1180/// scope. The scope S will be the scope of the unnamed enumeration 1181/// within S6. In C++, this routine will return the scope associated 1182/// with S6, because the enumeration's scope is a transparent 1183/// context but structures can contain non-field names. In C, this 1184/// routine will return the translation unit scope, since the 1185/// enumeration's scope is a transparent context and structures cannot 1186/// contain non-field names. 1187Scope *Sema::getNonFieldDeclScope(Scope *S) { 1188 while (((S->getFlags() & Scope::DeclScope) == 0) || 1189 (S->getEntity() && 1190 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1191 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1192 S = S->getParent(); 1193 return S; 1194} 1195 1196/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1197/// file scope. lazily create a decl for it. ForRedeclaration is true 1198/// if we're creating this built-in in anticipation of redeclaring the 1199/// built-in. 1200NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1201 Scope *S, bool ForRedeclaration, 1202 SourceLocation Loc) { 1203 Builtin::ID BID = (Builtin::ID)bid; 1204 1205 ASTContext::GetBuiltinTypeError Error; 1206 QualType R = Context.GetBuiltinType(BID, Error); 1207 switch (Error) { 1208 case ASTContext::GE_None: 1209 // Okay 1210 break; 1211 1212 case ASTContext::GE_Missing_stdio: 1213 if (ForRedeclaration) 1214 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1215 << Context.BuiltinInfo.GetName(BID); 1216 return 0; 1217 1218 case ASTContext::GE_Missing_setjmp: 1219 if (ForRedeclaration) 1220 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1221 << Context.BuiltinInfo.GetName(BID); 1222 return 0; 1223 } 1224 1225 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1226 Diag(Loc, diag::ext_implicit_lib_function_decl) 1227 << Context.BuiltinInfo.GetName(BID) 1228 << R; 1229 if (Context.BuiltinInfo.getHeaderName(BID) && 1230 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1231 != Diagnostic::Ignored) 1232 Diag(Loc, diag::note_please_include_header) 1233 << Context.BuiltinInfo.getHeaderName(BID) 1234 << Context.BuiltinInfo.GetName(BID); 1235 } 1236 1237 FunctionDecl *New = FunctionDecl::Create(Context, 1238 Context.getTranslationUnitDecl(), 1239 Loc, Loc, II, R, /*TInfo=*/0, 1240 SC_Extern, 1241 SC_None, false, 1242 /*hasPrototype=*/true); 1243 New->setImplicit(); 1244 1245 // Create Decl objects for each parameter, adding them to the 1246 // FunctionDecl. 1247 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1248 llvm::SmallVector<ParmVarDecl*, 16> Params; 1249 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1250 ParmVarDecl *parm = 1251 ParmVarDecl::Create(Context, New, SourceLocation(), 1252 SourceLocation(), 0, 1253 FT->getArgType(i), /*TInfo=*/0, 1254 SC_None, SC_None, 0); 1255 parm->setScopeInfo(0, i); 1256 Params.push_back(parm); 1257 } 1258 New->setParams(Params.data(), Params.size()); 1259 } 1260 1261 AddKnownFunctionAttributes(New); 1262 1263 // TUScope is the translation-unit scope to insert this function into. 1264 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1265 // relate Scopes to DeclContexts, and probably eliminate CurContext 1266 // entirely, but we're not there yet. 1267 DeclContext *SavedContext = CurContext; 1268 CurContext = Context.getTranslationUnitDecl(); 1269 PushOnScopeChains(New, TUScope); 1270 CurContext = SavedContext; 1271 return New; 1272} 1273 1274/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1275/// same name and scope as a previous declaration 'Old'. Figure out 1276/// how to resolve this situation, merging decls or emitting 1277/// diagnostics as appropriate. If there was an error, set New to be invalid. 1278/// 1279void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1280 // If the new decl is known invalid already, don't bother doing any 1281 // merging checks. 1282 if (New->isInvalidDecl()) return; 1283 1284 // Allow multiple definitions for ObjC built-in typedefs. 1285 // FIXME: Verify the underlying types are equivalent! 1286 if (getLangOptions().ObjC1) { 1287 const IdentifierInfo *TypeID = New->getIdentifier(); 1288 switch (TypeID->getLength()) { 1289 default: break; 1290 case 2: 1291 if (!TypeID->isStr("id")) 1292 break; 1293 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 1294 // Install the built-in type for 'id', ignoring the current definition. 1295 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1296 return; 1297 case 5: 1298 if (!TypeID->isStr("Class")) 1299 break; 1300 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 1301 // Install the built-in type for 'Class', ignoring the current definition. 1302 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1303 return; 1304 case 3: 1305 if (!TypeID->isStr("SEL")) 1306 break; 1307 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 1308 // Install the built-in type for 'SEL', ignoring the current definition. 1309 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1310 return; 1311 case 8: 1312 if (!TypeID->isStr("Protocol")) 1313 break; 1314 Context.setObjCProtoType(New->getUnderlyingType()); 1315 return; 1316 } 1317 // Fall through - the typedef name was not a builtin type. 1318 } 1319 1320 // Verify the old decl was also a type. 1321 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1322 if (!Old) { 1323 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1324 << New->getDeclName(); 1325 1326 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1327 if (OldD->getLocation().isValid()) 1328 Diag(OldD->getLocation(), diag::note_previous_definition); 1329 1330 return New->setInvalidDecl(); 1331 } 1332 1333 // If the old declaration is invalid, just give up here. 1334 if (Old->isInvalidDecl()) 1335 return New->setInvalidDecl(); 1336 1337 // Determine the "old" type we'll use for checking and diagnostics. 1338 QualType OldType; 1339 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1340 OldType = OldTypedef->getUnderlyingType(); 1341 else 1342 OldType = Context.getTypeDeclType(Old); 1343 1344 // If the typedef types are not identical, reject them in all languages and 1345 // with any extensions enabled. 1346 1347 if (OldType != New->getUnderlyingType() && 1348 Context.getCanonicalType(OldType) != 1349 Context.getCanonicalType(New->getUnderlyingType())) { 1350 int Kind = 0; 1351 if (isa<TypeAliasDecl>(Old)) 1352 Kind = 1; 1353 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1354 << Kind << New->getUnderlyingType() << OldType; 1355 if (Old->getLocation().isValid()) 1356 Diag(Old->getLocation(), diag::note_previous_definition); 1357 return New->setInvalidDecl(); 1358 } 1359 1360 // The types match. Link up the redeclaration chain if the old 1361 // declaration was a typedef. 1362 // FIXME: this is a potential source of wierdness if the type 1363 // spellings don't match exactly. 1364 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1365 New->setPreviousDeclaration(Typedef); 1366 1367 if (getLangOptions().Microsoft) 1368 return; 1369 1370 if (getLangOptions().CPlusPlus) { 1371 // C++ [dcl.typedef]p2: 1372 // In a given non-class scope, a typedef specifier can be used to 1373 // redefine the name of any type declared in that scope to refer 1374 // to the type to which it already refers. 1375 if (!isa<CXXRecordDecl>(CurContext)) 1376 return; 1377 1378 // C++0x [dcl.typedef]p4: 1379 // In a given class scope, a typedef specifier can be used to redefine 1380 // any class-name declared in that scope that is not also a typedef-name 1381 // to refer to the type to which it already refers. 1382 // 1383 // This wording came in via DR424, which was a correction to the 1384 // wording in DR56, which accidentally banned code like: 1385 // 1386 // struct S { 1387 // typedef struct A { } A; 1388 // }; 1389 // 1390 // in the C++03 standard. We implement the C++0x semantics, which 1391 // allow the above but disallow 1392 // 1393 // struct S { 1394 // typedef int I; 1395 // typedef int I; 1396 // }; 1397 // 1398 // since that was the intent of DR56. 1399 if (!isa<TypedefNameDecl>(Old)) 1400 return; 1401 1402 Diag(New->getLocation(), diag::err_redefinition) 1403 << New->getDeclName(); 1404 Diag(Old->getLocation(), diag::note_previous_definition); 1405 return New->setInvalidDecl(); 1406 } 1407 1408 // If we have a redefinition of a typedef in C, emit a warning. This warning 1409 // is normally mapped to an error, but can be controlled with 1410 // -Wtypedef-redefinition. If either the original or the redefinition is 1411 // in a system header, don't emit this for compatibility with GCC. 1412 if (getDiagnostics().getSuppressSystemWarnings() && 1413 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1414 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1415 return; 1416 1417 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1418 << New->getDeclName(); 1419 Diag(Old->getLocation(), diag::note_previous_definition); 1420 return; 1421} 1422 1423/// DeclhasAttr - returns true if decl Declaration already has the target 1424/// attribute. 1425static bool 1426DeclHasAttr(const Decl *D, const Attr *A) { 1427 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1428 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1429 if ((*i)->getKind() == A->getKind()) { 1430 // FIXME: Don't hardcode this check 1431 if (OA && isa<OwnershipAttr>(*i)) 1432 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1433 return true; 1434 } 1435 1436 return false; 1437} 1438 1439/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1440static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1441 ASTContext &C) { 1442 if (!oldDecl->hasAttrs()) 1443 return; 1444 1445 bool foundAny = newDecl->hasAttrs(); 1446 1447 // Ensure that any moving of objects within the allocated map is done before 1448 // we process them. 1449 if (!foundAny) newDecl->setAttrs(AttrVec()); 1450 1451 for (specific_attr_iterator<InheritableAttr> 1452 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1453 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1454 if (!DeclHasAttr(newDecl, *i)) { 1455 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1456 newAttr->setInherited(true); 1457 newDecl->addAttr(newAttr); 1458 foundAny = true; 1459 } 1460 } 1461 1462 if (!foundAny) newDecl->dropAttrs(); 1463} 1464 1465/// mergeParamDeclAttributes - Copy attributes from the old parameter 1466/// to the new one. 1467static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1468 const ParmVarDecl *oldDecl, 1469 ASTContext &C) { 1470 if (!oldDecl->hasAttrs()) 1471 return; 1472 1473 bool foundAny = newDecl->hasAttrs(); 1474 1475 // Ensure that any moving of objects within the allocated map is 1476 // done before we process them. 1477 if (!foundAny) newDecl->setAttrs(AttrVec()); 1478 1479 for (specific_attr_iterator<InheritableParamAttr> 1480 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1481 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1482 if (!DeclHasAttr(newDecl, *i)) { 1483 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1484 newAttr->setInherited(true); 1485 newDecl->addAttr(newAttr); 1486 foundAny = true; 1487 } 1488 } 1489 1490 if (!foundAny) newDecl->dropAttrs(); 1491} 1492 1493namespace { 1494 1495/// Used in MergeFunctionDecl to keep track of function parameters in 1496/// C. 1497struct GNUCompatibleParamWarning { 1498 ParmVarDecl *OldParm; 1499 ParmVarDecl *NewParm; 1500 QualType PromotedType; 1501}; 1502 1503} 1504 1505/// getSpecialMember - get the special member enum for a method. 1506Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1507 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1508 if (Ctor->isDefaultConstructor()) 1509 return Sema::CXXDefaultConstructor; 1510 1511 if (Ctor->isCopyConstructor()) 1512 return Sema::CXXCopyConstructor; 1513 1514 if (Ctor->isMoveConstructor()) 1515 return Sema::CXXMoveConstructor; 1516 } else if (isa<CXXDestructorDecl>(MD)) { 1517 return Sema::CXXDestructor; 1518 } else if (MD->isCopyAssignmentOperator()) { 1519 return Sema::CXXCopyAssignment; 1520 } 1521 1522 return Sema::CXXInvalid; 1523} 1524 1525/// canRedefineFunction - checks if a function can be redefined. Currently, 1526/// only extern inline functions can be redefined, and even then only in 1527/// GNU89 mode. 1528static bool canRedefineFunction(const FunctionDecl *FD, 1529 const LangOptions& LangOpts) { 1530 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1531 !LangOpts.CPlusPlus && 1532 FD->isInlineSpecified() && 1533 FD->getStorageClass() == SC_Extern); 1534} 1535 1536/// MergeFunctionDecl - We just parsed a function 'New' from 1537/// declarator D which has the same name and scope as a previous 1538/// declaration 'Old'. Figure out how to resolve this situation, 1539/// merging decls or emitting diagnostics as appropriate. 1540/// 1541/// In C++, New and Old must be declarations that are not 1542/// overloaded. Use IsOverload to determine whether New and Old are 1543/// overloaded, and to select the Old declaration that New should be 1544/// merged with. 1545/// 1546/// Returns true if there was an error, false otherwise. 1547bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1548 // Verify the old decl was also a function. 1549 FunctionDecl *Old = 0; 1550 if (FunctionTemplateDecl *OldFunctionTemplate 1551 = dyn_cast<FunctionTemplateDecl>(OldD)) 1552 Old = OldFunctionTemplate->getTemplatedDecl(); 1553 else 1554 Old = dyn_cast<FunctionDecl>(OldD); 1555 if (!Old) { 1556 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1557 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1558 Diag(Shadow->getTargetDecl()->getLocation(), 1559 diag::note_using_decl_target); 1560 Diag(Shadow->getUsingDecl()->getLocation(), 1561 diag::note_using_decl) << 0; 1562 return true; 1563 } 1564 1565 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1566 << New->getDeclName(); 1567 Diag(OldD->getLocation(), diag::note_previous_definition); 1568 return true; 1569 } 1570 1571 // Determine whether the previous declaration was a definition, 1572 // implicit declaration, or a declaration. 1573 diag::kind PrevDiag; 1574 if (Old->isThisDeclarationADefinition()) 1575 PrevDiag = diag::note_previous_definition; 1576 else if (Old->isImplicit()) 1577 PrevDiag = diag::note_previous_implicit_declaration; 1578 else 1579 PrevDiag = diag::note_previous_declaration; 1580 1581 QualType OldQType = Context.getCanonicalType(Old->getType()); 1582 QualType NewQType = Context.getCanonicalType(New->getType()); 1583 1584 // Don't complain about this if we're in GNU89 mode and the old function 1585 // is an extern inline function. 1586 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1587 New->getStorageClass() == SC_Static && 1588 Old->getStorageClass() != SC_Static && 1589 !canRedefineFunction(Old, getLangOptions())) { 1590 if (getLangOptions().Microsoft) { 1591 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1592 Diag(Old->getLocation(), PrevDiag); 1593 } else { 1594 Diag(New->getLocation(), diag::err_static_non_static) << New; 1595 Diag(Old->getLocation(), PrevDiag); 1596 return true; 1597 } 1598 } 1599 1600 // If a function is first declared with a calling convention, but is 1601 // later declared or defined without one, the second decl assumes the 1602 // calling convention of the first. 1603 // 1604 // For the new decl, we have to look at the NON-canonical type to tell the 1605 // difference between a function that really doesn't have a calling 1606 // convention and one that is declared cdecl. That's because in 1607 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1608 // because it is the default calling convention. 1609 // 1610 // Note also that we DO NOT return at this point, because we still have 1611 // other tests to run. 1612 const FunctionType *OldType = cast<FunctionType>(OldQType); 1613 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1614 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1615 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1616 bool RequiresAdjustment = false; 1617 if (OldTypeInfo.getCC() != CC_Default && 1618 NewTypeInfo.getCC() == CC_Default) { 1619 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1620 RequiresAdjustment = true; 1621 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1622 NewTypeInfo.getCC())) { 1623 // Calling conventions really aren't compatible, so complain. 1624 Diag(New->getLocation(), diag::err_cconv_change) 1625 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1626 << (OldTypeInfo.getCC() == CC_Default) 1627 << (OldTypeInfo.getCC() == CC_Default ? "" : 1628 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1629 Diag(Old->getLocation(), diag::note_previous_declaration); 1630 return true; 1631 } 1632 1633 // FIXME: diagnose the other way around? 1634 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1635 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1636 RequiresAdjustment = true; 1637 } 1638 1639 // Merge regparm attribute. 1640 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1641 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1642 if (NewTypeInfo.getHasRegParm()) { 1643 Diag(New->getLocation(), diag::err_regparm_mismatch) 1644 << NewType->getRegParmType() 1645 << OldType->getRegParmType(); 1646 Diag(Old->getLocation(), diag::note_previous_declaration); 1647 return true; 1648 } 1649 1650 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1651 RequiresAdjustment = true; 1652 } 1653 1654 if (RequiresAdjustment) { 1655 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1656 New->setType(QualType(NewType, 0)); 1657 NewQType = Context.getCanonicalType(New->getType()); 1658 } 1659 1660 if (getLangOptions().CPlusPlus) { 1661 // (C++98 13.1p2): 1662 // Certain function declarations cannot be overloaded: 1663 // -- Function declarations that differ only in the return type 1664 // cannot be overloaded. 1665 QualType OldReturnType = OldType->getResultType(); 1666 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1667 QualType ResQT; 1668 if (OldReturnType != NewReturnType) { 1669 if (NewReturnType->isObjCObjectPointerType() 1670 && OldReturnType->isObjCObjectPointerType()) 1671 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1672 if (ResQT.isNull()) { 1673 if (New->isCXXClassMember() && New->isOutOfLine()) 1674 Diag(New->getLocation(), 1675 diag::err_member_def_does_not_match_ret_type) << New; 1676 else 1677 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1678 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1679 return true; 1680 } 1681 else 1682 NewQType = ResQT; 1683 } 1684 1685 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1686 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1687 if (OldMethod && NewMethod) { 1688 // Preserve triviality. 1689 NewMethod->setTrivial(OldMethod->isTrivial()); 1690 1691 bool isFriend = NewMethod->getFriendObjectKind(); 1692 1693 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1694 // -- Member function declarations with the same name and the 1695 // same parameter types cannot be overloaded if any of them 1696 // is a static member function declaration. 1697 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1698 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1699 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1700 return true; 1701 } 1702 1703 // C++ [class.mem]p1: 1704 // [...] A member shall not be declared twice in the 1705 // member-specification, except that a nested class or member 1706 // class template can be declared and then later defined. 1707 unsigned NewDiag; 1708 if (isa<CXXConstructorDecl>(OldMethod)) 1709 NewDiag = diag::err_constructor_redeclared; 1710 else if (isa<CXXDestructorDecl>(NewMethod)) 1711 NewDiag = diag::err_destructor_redeclared; 1712 else if (isa<CXXConversionDecl>(NewMethod)) 1713 NewDiag = diag::err_conv_function_redeclared; 1714 else 1715 NewDiag = diag::err_member_redeclared; 1716 1717 Diag(New->getLocation(), NewDiag); 1718 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1719 1720 // Complain if this is an explicit declaration of a special 1721 // member that was initially declared implicitly. 1722 // 1723 // As an exception, it's okay to befriend such methods in order 1724 // to permit the implicit constructor/destructor/operator calls. 1725 } else if (OldMethod->isImplicit()) { 1726 if (isFriend) { 1727 NewMethod->setImplicit(); 1728 } else { 1729 Diag(NewMethod->getLocation(), 1730 diag::err_definition_of_implicitly_declared_member) 1731 << New << getSpecialMember(OldMethod); 1732 return true; 1733 } 1734 } else if (OldMethod->isExplicitlyDefaulted()) { 1735 Diag(NewMethod->getLocation(), 1736 diag::err_definition_of_explicitly_defaulted_member) 1737 << getSpecialMember(OldMethod); 1738 return true; 1739 } 1740 } 1741 1742 // (C++98 8.3.5p3): 1743 // All declarations for a function shall agree exactly in both the 1744 // return type and the parameter-type-list. 1745 // We also want to respect all the extended bits except noreturn. 1746 1747 // noreturn should now match unless the old type info didn't have it. 1748 QualType OldQTypeForComparison = OldQType; 1749 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1750 assert(OldQType == QualType(OldType, 0)); 1751 const FunctionType *OldTypeForComparison 1752 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1753 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1754 assert(OldQTypeForComparison.isCanonical()); 1755 } 1756 1757 if (OldQTypeForComparison == NewQType) 1758 return MergeCompatibleFunctionDecls(New, Old); 1759 1760 // Fall through for conflicting redeclarations and redefinitions. 1761 } 1762 1763 // C: Function types need to be compatible, not identical. This handles 1764 // duplicate function decls like "void f(int); void f(enum X);" properly. 1765 if (!getLangOptions().CPlusPlus && 1766 Context.typesAreCompatible(OldQType, NewQType)) { 1767 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1768 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1769 const FunctionProtoType *OldProto = 0; 1770 if (isa<FunctionNoProtoType>(NewFuncType) && 1771 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1772 // The old declaration provided a function prototype, but the 1773 // new declaration does not. Merge in the prototype. 1774 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1775 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1776 OldProto->arg_type_end()); 1777 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1778 ParamTypes.data(), ParamTypes.size(), 1779 OldProto->getExtProtoInfo()); 1780 New->setType(NewQType); 1781 New->setHasInheritedPrototype(); 1782 1783 // Synthesize a parameter for each argument type. 1784 llvm::SmallVector<ParmVarDecl*, 16> Params; 1785 for (FunctionProtoType::arg_type_iterator 1786 ParamType = OldProto->arg_type_begin(), 1787 ParamEnd = OldProto->arg_type_end(); 1788 ParamType != ParamEnd; ++ParamType) { 1789 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1790 SourceLocation(), 1791 SourceLocation(), 0, 1792 *ParamType, /*TInfo=*/0, 1793 SC_None, SC_None, 1794 0); 1795 Param->setScopeInfo(0, Params.size()); 1796 Param->setImplicit(); 1797 Params.push_back(Param); 1798 } 1799 1800 New->setParams(Params.data(), Params.size()); 1801 } 1802 1803 return MergeCompatibleFunctionDecls(New, Old); 1804 } 1805 1806 // GNU C permits a K&R definition to follow a prototype declaration 1807 // if the declared types of the parameters in the K&R definition 1808 // match the types in the prototype declaration, even when the 1809 // promoted types of the parameters from the K&R definition differ 1810 // from the types in the prototype. GCC then keeps the types from 1811 // the prototype. 1812 // 1813 // If a variadic prototype is followed by a non-variadic K&R definition, 1814 // the K&R definition becomes variadic. This is sort of an edge case, but 1815 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1816 // C99 6.9.1p8. 1817 if (!getLangOptions().CPlusPlus && 1818 Old->hasPrototype() && !New->hasPrototype() && 1819 New->getType()->getAs<FunctionProtoType>() && 1820 Old->getNumParams() == New->getNumParams()) { 1821 llvm::SmallVector<QualType, 16> ArgTypes; 1822 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1823 const FunctionProtoType *OldProto 1824 = Old->getType()->getAs<FunctionProtoType>(); 1825 const FunctionProtoType *NewProto 1826 = New->getType()->getAs<FunctionProtoType>(); 1827 1828 // Determine whether this is the GNU C extension. 1829 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1830 NewProto->getResultType()); 1831 bool LooseCompatible = !MergedReturn.isNull(); 1832 for (unsigned Idx = 0, End = Old->getNumParams(); 1833 LooseCompatible && Idx != End; ++Idx) { 1834 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1835 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1836 if (Context.typesAreCompatible(OldParm->getType(), 1837 NewProto->getArgType(Idx))) { 1838 ArgTypes.push_back(NewParm->getType()); 1839 } else if (Context.typesAreCompatible(OldParm->getType(), 1840 NewParm->getType(), 1841 /*CompareUnqualified=*/true)) { 1842 GNUCompatibleParamWarning Warn 1843 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1844 Warnings.push_back(Warn); 1845 ArgTypes.push_back(NewParm->getType()); 1846 } else 1847 LooseCompatible = false; 1848 } 1849 1850 if (LooseCompatible) { 1851 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1852 Diag(Warnings[Warn].NewParm->getLocation(), 1853 diag::ext_param_promoted_not_compatible_with_prototype) 1854 << Warnings[Warn].PromotedType 1855 << Warnings[Warn].OldParm->getType(); 1856 if (Warnings[Warn].OldParm->getLocation().isValid()) 1857 Diag(Warnings[Warn].OldParm->getLocation(), 1858 diag::note_previous_declaration); 1859 } 1860 1861 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1862 ArgTypes.size(), 1863 OldProto->getExtProtoInfo())); 1864 return MergeCompatibleFunctionDecls(New, Old); 1865 } 1866 1867 // Fall through to diagnose conflicting types. 1868 } 1869 1870 // A function that has already been declared has been redeclared or defined 1871 // with a different type- show appropriate diagnostic 1872 if (unsigned BuiltinID = Old->getBuiltinID()) { 1873 // The user has declared a builtin function with an incompatible 1874 // signature. 1875 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1876 // The function the user is redeclaring is a library-defined 1877 // function like 'malloc' or 'printf'. Warn about the 1878 // redeclaration, then pretend that we don't know about this 1879 // library built-in. 1880 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1881 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1882 << Old << Old->getType(); 1883 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1884 Old->setInvalidDecl(); 1885 return false; 1886 } 1887 1888 PrevDiag = diag::note_previous_builtin_declaration; 1889 } 1890 1891 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1892 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1893 return true; 1894} 1895 1896/// \brief Completes the merge of two function declarations that are 1897/// known to be compatible. 1898/// 1899/// This routine handles the merging of attributes and other 1900/// properties of function declarations form the old declaration to 1901/// the new declaration, once we know that New is in fact a 1902/// redeclaration of Old. 1903/// 1904/// \returns false 1905bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1906 // Merge the attributes 1907 mergeDeclAttributes(New, Old, Context); 1908 1909 // Merge the storage class. 1910 if (Old->getStorageClass() != SC_Extern && 1911 Old->getStorageClass() != SC_None) 1912 New->setStorageClass(Old->getStorageClass()); 1913 1914 // Merge "pure" flag. 1915 if (Old->isPure()) 1916 New->setPure(); 1917 1918 // Merge attributes from the parameters. These can mismatch with K&R 1919 // declarations. 1920 if (New->getNumParams() == Old->getNumParams()) 1921 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1922 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1923 Context); 1924 1925 if (getLangOptions().CPlusPlus) 1926 return MergeCXXFunctionDecl(New, Old); 1927 1928 return false; 1929} 1930 1931void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1932 const ObjCMethodDecl *oldMethod) { 1933 // Merge the attributes. 1934 mergeDeclAttributes(newMethod, oldMethod, Context); 1935 1936 // Merge attributes from the parameters. 1937 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 1938 ni = newMethod->param_begin(), ne = newMethod->param_end(); 1939 ni != ne; ++ni, ++oi) 1940 mergeParamDeclAttributes(*ni, *oi, Context); 1941 1942 CheckObjCMethodOverride(newMethod, oldMethod, true); 1943} 1944 1945/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 1946/// scope as a previous declaration 'Old'. Figure out how to merge their types, 1947/// emitting diagnostics as appropriate. 1948/// 1949/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 1950/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 1951/// check them before the initializer is attached. 1952/// 1953void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 1954 if (New->isInvalidDecl() || Old->isInvalidDecl()) 1955 return; 1956 1957 QualType MergedT; 1958 if (getLangOptions().CPlusPlus) { 1959 AutoType *AT = New->getType()->getContainedAutoType(); 1960 if (AT && !AT->isDeduced()) { 1961 // We don't know what the new type is until the initializer is attached. 1962 return; 1963 } else if (Context.hasSameType(New->getType(), Old->getType())) { 1964 // These could still be something that needs exception specs checked. 1965 return MergeVarDeclExceptionSpecs(New, Old); 1966 } 1967 // C++ [basic.link]p10: 1968 // [...] the types specified by all declarations referring to a given 1969 // object or function shall be identical, except that declarations for an 1970 // array object can specify array types that differ by the presence or 1971 // absence of a major array bound (8.3.4). 1972 else if (Old->getType()->isIncompleteArrayType() && 1973 New->getType()->isArrayType()) { 1974 CanQual<ArrayType> OldArray 1975 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1976 CanQual<ArrayType> NewArray 1977 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1978 if (OldArray->getElementType() == NewArray->getElementType()) 1979 MergedT = New->getType(); 1980 } else if (Old->getType()->isArrayType() && 1981 New->getType()->isIncompleteArrayType()) { 1982 CanQual<ArrayType> OldArray 1983 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1984 CanQual<ArrayType> NewArray 1985 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1986 if (OldArray->getElementType() == NewArray->getElementType()) 1987 MergedT = Old->getType(); 1988 } else if (New->getType()->isObjCObjectPointerType() 1989 && Old->getType()->isObjCObjectPointerType()) { 1990 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 1991 Old->getType()); 1992 } 1993 } else { 1994 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1995 } 1996 if (MergedT.isNull()) { 1997 Diag(New->getLocation(), diag::err_redefinition_different_type) 1998 << New->getDeclName(); 1999 Diag(Old->getLocation(), diag::note_previous_definition); 2000 return New->setInvalidDecl(); 2001 } 2002 New->setType(MergedT); 2003} 2004 2005/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2006/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2007/// situation, merging decls or emitting diagnostics as appropriate. 2008/// 2009/// Tentative definition rules (C99 6.9.2p2) are checked by 2010/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2011/// definitions here, since the initializer hasn't been attached. 2012/// 2013void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2014 // If the new decl is already invalid, don't do any other checking. 2015 if (New->isInvalidDecl()) 2016 return; 2017 2018 // Verify the old decl was also a variable. 2019 VarDecl *Old = 0; 2020 if (!Previous.isSingleResult() || 2021 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2022 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2023 << New->getDeclName(); 2024 Diag(Previous.getRepresentativeDecl()->getLocation(), 2025 diag::note_previous_definition); 2026 return New->setInvalidDecl(); 2027 } 2028 2029 // C++ [class.mem]p1: 2030 // A member shall not be declared twice in the member-specification [...] 2031 // 2032 // Here, we need only consider static data members. 2033 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2034 Diag(New->getLocation(), diag::err_duplicate_member) 2035 << New->getIdentifier(); 2036 Diag(Old->getLocation(), diag::note_previous_declaration); 2037 New->setInvalidDecl(); 2038 } 2039 2040 mergeDeclAttributes(New, Old, Context); 2041 2042 // Merge the types. 2043 MergeVarDeclTypes(New, Old); 2044 if (New->isInvalidDecl()) 2045 return; 2046 2047 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2048 if (New->getStorageClass() == SC_Static && 2049 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2050 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2051 Diag(Old->getLocation(), diag::note_previous_definition); 2052 return New->setInvalidDecl(); 2053 } 2054 // C99 6.2.2p4: 2055 // For an identifier declared with the storage-class specifier 2056 // extern in a scope in which a prior declaration of that 2057 // identifier is visible,23) if the prior declaration specifies 2058 // internal or external linkage, the linkage of the identifier at 2059 // the later declaration is the same as the linkage specified at 2060 // the prior declaration. If no prior declaration is visible, or 2061 // if the prior declaration specifies no linkage, then the 2062 // identifier has external linkage. 2063 if (New->hasExternalStorage() && Old->hasLinkage()) 2064 /* Okay */; 2065 else if (New->getStorageClass() != SC_Static && 2066 Old->getStorageClass() == SC_Static) { 2067 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2068 Diag(Old->getLocation(), diag::note_previous_definition); 2069 return New->setInvalidDecl(); 2070 } 2071 2072 // Check if extern is followed by non-extern and vice-versa. 2073 if (New->hasExternalStorage() && 2074 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2075 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2076 Diag(Old->getLocation(), diag::note_previous_definition); 2077 return New->setInvalidDecl(); 2078 } 2079 if (Old->hasExternalStorage() && 2080 !New->hasLinkage() && New->isLocalVarDecl()) { 2081 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2082 Diag(Old->getLocation(), diag::note_previous_definition); 2083 return New->setInvalidDecl(); 2084 } 2085 2086 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2087 2088 // FIXME: The test for external storage here seems wrong? We still 2089 // need to check for mismatches. 2090 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2091 // Don't complain about out-of-line definitions of static members. 2092 !(Old->getLexicalDeclContext()->isRecord() && 2093 !New->getLexicalDeclContext()->isRecord())) { 2094 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2095 Diag(Old->getLocation(), diag::note_previous_definition); 2096 return New->setInvalidDecl(); 2097 } 2098 2099 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2100 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2101 Diag(Old->getLocation(), diag::note_previous_definition); 2102 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2103 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2104 Diag(Old->getLocation(), diag::note_previous_definition); 2105 } 2106 2107 // C++ doesn't have tentative definitions, so go right ahead and check here. 2108 const VarDecl *Def; 2109 if (getLangOptions().CPlusPlus && 2110 New->isThisDeclarationADefinition() == VarDecl::Definition && 2111 (Def = Old->getDefinition())) { 2112 Diag(New->getLocation(), diag::err_redefinition) 2113 << New->getDeclName(); 2114 Diag(Def->getLocation(), diag::note_previous_definition); 2115 New->setInvalidDecl(); 2116 return; 2117 } 2118 // c99 6.2.2 P4. 2119 // For an identifier declared with the storage-class specifier extern in a 2120 // scope in which a prior declaration of that identifier is visible, if 2121 // the prior declaration specifies internal or external linkage, the linkage 2122 // of the identifier at the later declaration is the same as the linkage 2123 // specified at the prior declaration. 2124 // FIXME. revisit this code. 2125 if (New->hasExternalStorage() && 2126 Old->getLinkage() == InternalLinkage && 2127 New->getDeclContext() == Old->getDeclContext()) 2128 New->setStorageClass(Old->getStorageClass()); 2129 2130 // Keep a chain of previous declarations. 2131 New->setPreviousDeclaration(Old); 2132 2133 // Inherit access appropriately. 2134 New->setAccess(Old->getAccess()); 2135} 2136 2137/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2138/// no declarator (e.g. "struct foo;") is parsed. 2139Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2140 DeclSpec &DS) { 2141 return ParsedFreeStandingDeclSpec(S, AS, DS, 2142 MultiTemplateParamsArg(*this, 0, 0)); 2143} 2144 2145/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2146/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2147/// parameters to cope with template friend declarations. 2148Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2149 DeclSpec &DS, 2150 MultiTemplateParamsArg TemplateParams) { 2151 Decl *TagD = 0; 2152 TagDecl *Tag = 0; 2153 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2154 DS.getTypeSpecType() == DeclSpec::TST_struct || 2155 DS.getTypeSpecType() == DeclSpec::TST_union || 2156 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2157 TagD = DS.getRepAsDecl(); 2158 2159 if (!TagD) // We probably had an error 2160 return 0; 2161 2162 // Note that the above type specs guarantee that the 2163 // type rep is a Decl, whereas in many of the others 2164 // it's a Type. 2165 Tag = dyn_cast<TagDecl>(TagD); 2166 } 2167 2168 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2169 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2170 // or incomplete types shall not be restrict-qualified." 2171 if (TypeQuals & DeclSpec::TQ_restrict) 2172 Diag(DS.getRestrictSpecLoc(), 2173 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2174 << DS.getSourceRange(); 2175 } 2176 2177 if (DS.isFriendSpecified()) { 2178 // If we're dealing with a decl but not a TagDecl, assume that 2179 // whatever routines created it handled the friendship aspect. 2180 if (TagD && !Tag) 2181 return 0; 2182 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2183 } 2184 2185 // Track whether we warned about the fact that there aren't any 2186 // declarators. 2187 bool emittedWarning = false; 2188 2189 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2190 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2191 2192 if (!Record->getDeclName() && Record->isDefinition() && 2193 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2194 if (getLangOptions().CPlusPlus || 2195 Record->getDeclContext()->isRecord()) 2196 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2197 2198 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2199 << DS.getSourceRange(); 2200 emittedWarning = true; 2201 } 2202 } 2203 2204 // Check for Microsoft C extension: anonymous struct. 2205 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 2206 CurContext->isRecord() && 2207 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2208 // Handle 2 kinds of anonymous struct: 2209 // struct STRUCT; 2210 // and 2211 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2212 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2213 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2214 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2215 DS.getRepAsType().get()->isStructureType())) { 2216 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2217 << DS.getSourceRange(); 2218 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2219 } 2220 } 2221 2222 if (getLangOptions().CPlusPlus && 2223 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2224 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2225 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2226 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2227 Diag(Enum->getLocation(), diag::ext_no_declarators) 2228 << DS.getSourceRange(); 2229 emittedWarning = true; 2230 } 2231 2232 // Skip all the checks below if we have a type error. 2233 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2234 2235 if (!DS.isMissingDeclaratorOk()) { 2236 // Warn about typedefs of enums without names, since this is an 2237 // extension in both Microsoft and GNU. 2238 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2239 Tag && isa<EnumDecl>(Tag)) { 2240 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2241 << DS.getSourceRange(); 2242 return Tag; 2243 } 2244 2245 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2246 << DS.getSourceRange(); 2247 emittedWarning = true; 2248 } 2249 2250 // We're going to complain about a bunch of spurious specifiers; 2251 // only do this if we're declaring a tag, because otherwise we 2252 // should be getting diag::ext_no_declarators. 2253 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2254 return TagD; 2255 2256 // Note that a linkage-specification sets a storage class, but 2257 // 'extern "C" struct foo;' is actually valid and not theoretically 2258 // useless. 2259 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2260 if (!DS.isExternInLinkageSpec()) 2261 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2262 << DeclSpec::getSpecifierName(scs); 2263 2264 if (DS.isThreadSpecified()) 2265 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2266 if (DS.getTypeQualifiers()) { 2267 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2268 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2269 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2270 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2271 // Restrict is covered above. 2272 } 2273 if (DS.isInlineSpecified()) 2274 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2275 if (DS.isVirtualSpecified()) 2276 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2277 if (DS.isExplicitSpecified()) 2278 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2279 2280 // FIXME: Warn on useless attributes 2281 2282 return TagD; 2283} 2284 2285/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2286/// builds a statement for it and returns it so it is evaluated. 2287StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2288 StmtResult R; 2289 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2290 Expr *Exp = DS.getRepAsExpr(); 2291 QualType Ty = Exp->getType(); 2292 if (Ty->isPointerType()) { 2293 do 2294 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2295 while (Ty->isPointerType()); 2296 } 2297 if (Ty->isVariableArrayType()) { 2298 R = ActOnExprStmt(MakeFullExpr(Exp)); 2299 } 2300 } 2301 return R; 2302} 2303 2304/// We are trying to inject an anonymous member into the given scope; 2305/// check if there's an existing declaration that can't be overloaded. 2306/// 2307/// \return true if this is a forbidden redeclaration 2308static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2309 Scope *S, 2310 DeclContext *Owner, 2311 DeclarationName Name, 2312 SourceLocation NameLoc, 2313 unsigned diagnostic) { 2314 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2315 Sema::ForRedeclaration); 2316 if (!SemaRef.LookupName(R, S)) return false; 2317 2318 if (R.getAsSingle<TagDecl>()) 2319 return false; 2320 2321 // Pick a representative declaration. 2322 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2323 assert(PrevDecl && "Expected a non-null Decl"); 2324 2325 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2326 return false; 2327 2328 SemaRef.Diag(NameLoc, diagnostic) << Name; 2329 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2330 2331 return true; 2332} 2333 2334/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2335/// anonymous struct or union AnonRecord into the owning context Owner 2336/// and scope S. This routine will be invoked just after we realize 2337/// that an unnamed union or struct is actually an anonymous union or 2338/// struct, e.g., 2339/// 2340/// @code 2341/// union { 2342/// int i; 2343/// float f; 2344/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2345/// // f into the surrounding scope.x 2346/// @endcode 2347/// 2348/// This routine is recursive, injecting the names of nested anonymous 2349/// structs/unions into the owning context and scope as well. 2350static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2351 DeclContext *Owner, 2352 RecordDecl *AnonRecord, 2353 AccessSpecifier AS, 2354 llvm::SmallVector<NamedDecl*, 2> &Chaining, 2355 bool MSAnonStruct) { 2356 unsigned diagKind 2357 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2358 : diag::err_anonymous_struct_member_redecl; 2359 2360 bool Invalid = false; 2361 2362 // Look every FieldDecl and IndirectFieldDecl with a name. 2363 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2364 DEnd = AnonRecord->decls_end(); 2365 D != DEnd; ++D) { 2366 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2367 cast<NamedDecl>(*D)->getDeclName()) { 2368 ValueDecl *VD = cast<ValueDecl>(*D); 2369 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2370 VD->getLocation(), diagKind)) { 2371 // C++ [class.union]p2: 2372 // The names of the members of an anonymous union shall be 2373 // distinct from the names of any other entity in the 2374 // scope in which the anonymous union is declared. 2375 Invalid = true; 2376 } else { 2377 // C++ [class.union]p2: 2378 // For the purpose of name lookup, after the anonymous union 2379 // definition, the members of the anonymous union are 2380 // considered to have been defined in the scope in which the 2381 // anonymous union is declared. 2382 unsigned OldChainingSize = Chaining.size(); 2383 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2384 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2385 PE = IF->chain_end(); PI != PE; ++PI) 2386 Chaining.push_back(*PI); 2387 else 2388 Chaining.push_back(VD); 2389 2390 assert(Chaining.size() >= 2); 2391 NamedDecl **NamedChain = 2392 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2393 for (unsigned i = 0; i < Chaining.size(); i++) 2394 NamedChain[i] = Chaining[i]; 2395 2396 IndirectFieldDecl* IndirectField = 2397 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2398 VD->getIdentifier(), VD->getType(), 2399 NamedChain, Chaining.size()); 2400 2401 IndirectField->setAccess(AS); 2402 IndirectField->setImplicit(); 2403 SemaRef.PushOnScopeChains(IndirectField, S); 2404 2405 // That includes picking up the appropriate access specifier. 2406 if (AS != AS_none) IndirectField->setAccess(AS); 2407 2408 Chaining.resize(OldChainingSize); 2409 } 2410 } 2411 } 2412 2413 return Invalid; 2414} 2415 2416/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2417/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2418/// illegal input values are mapped to SC_None. 2419static StorageClass 2420StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2421 switch (StorageClassSpec) { 2422 case DeclSpec::SCS_unspecified: return SC_None; 2423 case DeclSpec::SCS_extern: return SC_Extern; 2424 case DeclSpec::SCS_static: return SC_Static; 2425 case DeclSpec::SCS_auto: return SC_Auto; 2426 case DeclSpec::SCS_register: return SC_Register; 2427 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2428 // Illegal SCSs map to None: error reporting is up to the caller. 2429 case DeclSpec::SCS_mutable: // Fall through. 2430 case DeclSpec::SCS_typedef: return SC_None; 2431 } 2432 llvm_unreachable("unknown storage class specifier"); 2433} 2434 2435/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2436/// a StorageClass. Any error reporting is up to the caller: 2437/// illegal input values are mapped to SC_None. 2438static StorageClass 2439StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2440 switch (StorageClassSpec) { 2441 case DeclSpec::SCS_unspecified: return SC_None; 2442 case DeclSpec::SCS_extern: return SC_Extern; 2443 case DeclSpec::SCS_static: return SC_Static; 2444 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2445 // Illegal SCSs map to None: error reporting is up to the caller. 2446 case DeclSpec::SCS_auto: // Fall through. 2447 case DeclSpec::SCS_mutable: // Fall through. 2448 case DeclSpec::SCS_register: // Fall through. 2449 case DeclSpec::SCS_typedef: return SC_None; 2450 } 2451 llvm_unreachable("unknown storage class specifier"); 2452} 2453 2454/// BuildAnonymousStructOrUnion - Handle the declaration of an 2455/// anonymous structure or union. Anonymous unions are a C++ feature 2456/// (C++ [class.union]) and a GNU C extension; anonymous structures 2457/// are a GNU C and GNU C++ extension. 2458Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2459 AccessSpecifier AS, 2460 RecordDecl *Record) { 2461 DeclContext *Owner = Record->getDeclContext(); 2462 2463 // Diagnose whether this anonymous struct/union is an extension. 2464 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2465 Diag(Record->getLocation(), diag::ext_anonymous_union); 2466 else if (!Record->isUnion()) 2467 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2468 2469 // C and C++ require different kinds of checks for anonymous 2470 // structs/unions. 2471 bool Invalid = false; 2472 if (getLangOptions().CPlusPlus) { 2473 const char* PrevSpec = 0; 2474 unsigned DiagID; 2475 // C++ [class.union]p3: 2476 // Anonymous unions declared in a named namespace or in the 2477 // global namespace shall be declared static. 2478 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2479 (isa<TranslationUnitDecl>(Owner) || 2480 (isa<NamespaceDecl>(Owner) && 2481 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2482 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2483 Invalid = true; 2484 2485 // Recover by adding 'static'. 2486 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2487 PrevSpec, DiagID, getLangOptions()); 2488 } 2489 // C++ [class.union]p3: 2490 // A storage class is not allowed in a declaration of an 2491 // anonymous union in a class scope. 2492 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2493 isa<RecordDecl>(Owner)) { 2494 Diag(DS.getStorageClassSpecLoc(), 2495 diag::err_anonymous_union_with_storage_spec); 2496 Invalid = true; 2497 2498 // Recover by removing the storage specifier. 2499 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2500 PrevSpec, DiagID, getLangOptions()); 2501 } 2502 2503 // Ignore const/volatile/restrict qualifiers. 2504 if (DS.getTypeQualifiers()) { 2505 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2506 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2507 << Record->isUnion() << 0 2508 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2509 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2510 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2511 << Record->isUnion() << 1 2512 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2513 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2514 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2515 << Record->isUnion() << 2 2516 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2517 2518 DS.ClearTypeQualifiers(); 2519 } 2520 2521 // C++ [class.union]p2: 2522 // The member-specification of an anonymous union shall only 2523 // define non-static data members. [Note: nested types and 2524 // functions cannot be declared within an anonymous union. ] 2525 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2526 MemEnd = Record->decls_end(); 2527 Mem != MemEnd; ++Mem) { 2528 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2529 // C++ [class.union]p3: 2530 // An anonymous union shall not have private or protected 2531 // members (clause 11). 2532 assert(FD->getAccess() != AS_none); 2533 if (FD->getAccess() != AS_public) { 2534 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2535 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2536 Invalid = true; 2537 } 2538 2539 // C++ [class.union]p1 2540 // An object of a class with a non-trivial constructor, a non-trivial 2541 // copy constructor, a non-trivial destructor, or a non-trivial copy 2542 // assignment operator cannot be a member of a union, nor can an 2543 // array of such objects. 2544 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2545 Invalid = true; 2546 } else if ((*Mem)->isImplicit()) { 2547 // Any implicit members are fine. 2548 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2549 // This is a type that showed up in an 2550 // elaborated-type-specifier inside the anonymous struct or 2551 // union, but which actually declares a type outside of the 2552 // anonymous struct or union. It's okay. 2553 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2554 if (!MemRecord->isAnonymousStructOrUnion() && 2555 MemRecord->getDeclName()) { 2556 // Visual C++ allows type definition in anonymous struct or union. 2557 if (getLangOptions().Microsoft) 2558 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2559 << (int)Record->isUnion(); 2560 else { 2561 // This is a nested type declaration. 2562 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2563 << (int)Record->isUnion(); 2564 Invalid = true; 2565 } 2566 } 2567 } else if (isa<AccessSpecDecl>(*Mem)) { 2568 // Any access specifier is fine. 2569 } else { 2570 // We have something that isn't a non-static data 2571 // member. Complain about it. 2572 unsigned DK = diag::err_anonymous_record_bad_member; 2573 if (isa<TypeDecl>(*Mem)) 2574 DK = diag::err_anonymous_record_with_type; 2575 else if (isa<FunctionDecl>(*Mem)) 2576 DK = diag::err_anonymous_record_with_function; 2577 else if (isa<VarDecl>(*Mem)) 2578 DK = diag::err_anonymous_record_with_static; 2579 2580 // Visual C++ allows type definition in anonymous struct or union. 2581 if (getLangOptions().Microsoft && 2582 DK == diag::err_anonymous_record_with_type) 2583 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2584 << (int)Record->isUnion(); 2585 else { 2586 Diag((*Mem)->getLocation(), DK) 2587 << (int)Record->isUnion(); 2588 Invalid = true; 2589 } 2590 } 2591 } 2592 } 2593 2594 if (!Record->isUnion() && !Owner->isRecord()) { 2595 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2596 << (int)getLangOptions().CPlusPlus; 2597 Invalid = true; 2598 } 2599 2600 // Mock up a declarator. 2601 Declarator Dc(DS, Declarator::TypeNameContext); 2602 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2603 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2604 2605 // Create a declaration for this anonymous struct/union. 2606 NamedDecl *Anon = 0; 2607 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2608 Anon = FieldDecl::Create(Context, OwningClass, 2609 DS.getSourceRange().getBegin(), 2610 Record->getLocation(), 2611 /*IdentifierInfo=*/0, 2612 Context.getTypeDeclType(Record), 2613 TInfo, 2614 /*BitWidth=*/0, /*Mutable=*/false, 2615 /*HasInit=*/false); 2616 Anon->setAccess(AS); 2617 if (getLangOptions().CPlusPlus) 2618 FieldCollector->Add(cast<FieldDecl>(Anon)); 2619 } else { 2620 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2621 assert(SCSpec != DeclSpec::SCS_typedef && 2622 "Parser allowed 'typedef' as storage class VarDecl."); 2623 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2624 if (SCSpec == DeclSpec::SCS_mutable) { 2625 // mutable can only appear on non-static class members, so it's always 2626 // an error here 2627 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2628 Invalid = true; 2629 SC = SC_None; 2630 } 2631 SCSpec = DS.getStorageClassSpecAsWritten(); 2632 VarDecl::StorageClass SCAsWritten 2633 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2634 2635 Anon = VarDecl::Create(Context, Owner, 2636 DS.getSourceRange().getBegin(), 2637 Record->getLocation(), /*IdentifierInfo=*/0, 2638 Context.getTypeDeclType(Record), 2639 TInfo, SC, SCAsWritten); 2640 } 2641 Anon->setImplicit(); 2642 2643 // Add the anonymous struct/union object to the current 2644 // context. We'll be referencing this object when we refer to one of 2645 // its members. 2646 Owner->addDecl(Anon); 2647 2648 // Inject the members of the anonymous struct/union into the owning 2649 // context and into the identifier resolver chain for name lookup 2650 // purposes. 2651 llvm::SmallVector<NamedDecl*, 2> Chain; 2652 Chain.push_back(Anon); 2653 2654 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2655 Chain, false)) 2656 Invalid = true; 2657 2658 // Mark this as an anonymous struct/union type. Note that we do not 2659 // do this until after we have already checked and injected the 2660 // members of this anonymous struct/union type, because otherwise 2661 // the members could be injected twice: once by DeclContext when it 2662 // builds its lookup table, and once by 2663 // InjectAnonymousStructOrUnionMembers. 2664 Record->setAnonymousStructOrUnion(true); 2665 2666 if (Invalid) 2667 Anon->setInvalidDecl(); 2668 2669 return Anon; 2670} 2671 2672/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2673/// Microsoft C anonymous structure. 2674/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2675/// Example: 2676/// 2677/// struct A { int a; }; 2678/// struct B { struct A; int b; }; 2679/// 2680/// void foo() { 2681/// B var; 2682/// var.a = 3; 2683/// } 2684/// 2685Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2686 RecordDecl *Record) { 2687 2688 // If there is no Record, get the record via the typedef. 2689 if (!Record) 2690 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2691 2692 // Mock up a declarator. 2693 Declarator Dc(DS, Declarator::TypeNameContext); 2694 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2695 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2696 2697 // Create a declaration for this anonymous struct. 2698 NamedDecl* Anon = FieldDecl::Create(Context, 2699 cast<RecordDecl>(CurContext), 2700 DS.getSourceRange().getBegin(), 2701 DS.getSourceRange().getBegin(), 2702 /*IdentifierInfo=*/0, 2703 Context.getTypeDeclType(Record), 2704 TInfo, 2705 /*BitWidth=*/0, /*Mutable=*/false, 2706 /*HasInit=*/false); 2707 Anon->setImplicit(); 2708 2709 // Add the anonymous struct object to the current context. 2710 CurContext->addDecl(Anon); 2711 2712 // Inject the members of the anonymous struct into the current 2713 // context and into the identifier resolver chain for name lookup 2714 // purposes. 2715 llvm::SmallVector<NamedDecl*, 2> Chain; 2716 Chain.push_back(Anon); 2717 2718 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2719 Record->getDefinition(), 2720 AS_none, Chain, true)) 2721 Anon->setInvalidDecl(); 2722 2723 return Anon; 2724} 2725 2726/// GetNameForDeclarator - Determine the full declaration name for the 2727/// given Declarator. 2728DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2729 return GetNameFromUnqualifiedId(D.getName()); 2730} 2731 2732/// \brief Retrieves the declaration name from a parsed unqualified-id. 2733DeclarationNameInfo 2734Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2735 DeclarationNameInfo NameInfo; 2736 NameInfo.setLoc(Name.StartLocation); 2737 2738 switch (Name.getKind()) { 2739 2740 case UnqualifiedId::IK_Identifier: 2741 NameInfo.setName(Name.Identifier); 2742 NameInfo.setLoc(Name.StartLocation); 2743 return NameInfo; 2744 2745 case UnqualifiedId::IK_OperatorFunctionId: 2746 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2747 Name.OperatorFunctionId.Operator)); 2748 NameInfo.setLoc(Name.StartLocation); 2749 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2750 = Name.OperatorFunctionId.SymbolLocations[0]; 2751 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2752 = Name.EndLocation.getRawEncoding(); 2753 return NameInfo; 2754 2755 case UnqualifiedId::IK_LiteralOperatorId: 2756 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2757 Name.Identifier)); 2758 NameInfo.setLoc(Name.StartLocation); 2759 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2760 return NameInfo; 2761 2762 case UnqualifiedId::IK_ConversionFunctionId: { 2763 TypeSourceInfo *TInfo; 2764 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2765 if (Ty.isNull()) 2766 return DeclarationNameInfo(); 2767 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2768 Context.getCanonicalType(Ty))); 2769 NameInfo.setLoc(Name.StartLocation); 2770 NameInfo.setNamedTypeInfo(TInfo); 2771 return NameInfo; 2772 } 2773 2774 case UnqualifiedId::IK_ConstructorName: { 2775 TypeSourceInfo *TInfo; 2776 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2777 if (Ty.isNull()) 2778 return DeclarationNameInfo(); 2779 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2780 Context.getCanonicalType(Ty))); 2781 NameInfo.setLoc(Name.StartLocation); 2782 NameInfo.setNamedTypeInfo(TInfo); 2783 return NameInfo; 2784 } 2785 2786 case UnqualifiedId::IK_ConstructorTemplateId: { 2787 // In well-formed code, we can only have a constructor 2788 // template-id that refers to the current context, so go there 2789 // to find the actual type being constructed. 2790 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2791 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2792 return DeclarationNameInfo(); 2793 2794 // Determine the type of the class being constructed. 2795 QualType CurClassType = Context.getTypeDeclType(CurClass); 2796 2797 // FIXME: Check two things: that the template-id names the same type as 2798 // CurClassType, and that the template-id does not occur when the name 2799 // was qualified. 2800 2801 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2802 Context.getCanonicalType(CurClassType))); 2803 NameInfo.setLoc(Name.StartLocation); 2804 // FIXME: should we retrieve TypeSourceInfo? 2805 NameInfo.setNamedTypeInfo(0); 2806 return NameInfo; 2807 } 2808 2809 case UnqualifiedId::IK_DestructorName: { 2810 TypeSourceInfo *TInfo; 2811 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2812 if (Ty.isNull()) 2813 return DeclarationNameInfo(); 2814 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2815 Context.getCanonicalType(Ty))); 2816 NameInfo.setLoc(Name.StartLocation); 2817 NameInfo.setNamedTypeInfo(TInfo); 2818 return NameInfo; 2819 } 2820 2821 case UnqualifiedId::IK_TemplateId: { 2822 TemplateName TName = Name.TemplateId->Template.get(); 2823 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2824 return Context.getNameForTemplate(TName, TNameLoc); 2825 } 2826 2827 } // switch (Name.getKind()) 2828 2829 assert(false && "Unknown name kind"); 2830 return DeclarationNameInfo(); 2831} 2832 2833/// isNearlyMatchingFunction - Determine whether the C++ functions 2834/// Declaration and Definition are "nearly" matching. This heuristic 2835/// is used to improve diagnostics in the case where an out-of-line 2836/// function definition doesn't match any declaration within 2837/// the class or namespace. 2838static bool isNearlyMatchingFunction(ASTContext &Context, 2839 FunctionDecl *Declaration, 2840 FunctionDecl *Definition) { 2841 if (Declaration->param_size() != Definition->param_size()) 2842 return false; 2843 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2844 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2845 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2846 2847 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2848 DefParamTy.getNonReferenceType())) 2849 return false; 2850 } 2851 2852 return true; 2853} 2854 2855/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2856/// declarator needs to be rebuilt in the current instantiation. 2857/// Any bits of declarator which appear before the name are valid for 2858/// consideration here. That's specifically the type in the decl spec 2859/// and the base type in any member-pointer chunks. 2860static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2861 DeclarationName Name) { 2862 // The types we specifically need to rebuild are: 2863 // - typenames, typeofs, and decltypes 2864 // - types which will become injected class names 2865 // Of course, we also need to rebuild any type referencing such a 2866 // type. It's safest to just say "dependent", but we call out a 2867 // few cases here. 2868 2869 DeclSpec &DS = D.getMutableDeclSpec(); 2870 switch (DS.getTypeSpecType()) { 2871 case DeclSpec::TST_typename: 2872 case DeclSpec::TST_typeofType: 2873 case DeclSpec::TST_decltype: 2874 case DeclSpec::TST_underlyingType: { 2875 // Grab the type from the parser. 2876 TypeSourceInfo *TSI = 0; 2877 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2878 if (T.isNull() || !T->isDependentType()) break; 2879 2880 // Make sure there's a type source info. This isn't really much 2881 // of a waste; most dependent types should have type source info 2882 // attached already. 2883 if (!TSI) 2884 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2885 2886 // Rebuild the type in the current instantiation. 2887 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2888 if (!TSI) return true; 2889 2890 // Store the new type back in the decl spec. 2891 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2892 DS.UpdateTypeRep(LocType); 2893 break; 2894 } 2895 2896 case DeclSpec::TST_typeofExpr: { 2897 Expr *E = DS.getRepAsExpr(); 2898 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2899 if (Result.isInvalid()) return true; 2900 DS.UpdateExprRep(Result.get()); 2901 break; 2902 } 2903 2904 default: 2905 // Nothing to do for these decl specs. 2906 break; 2907 } 2908 2909 // It doesn't matter what order we do this in. 2910 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2911 DeclaratorChunk &Chunk = D.getTypeObject(I); 2912 2913 // The only type information in the declarator which can come 2914 // before the declaration name is the base type of a member 2915 // pointer. 2916 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2917 continue; 2918 2919 // Rebuild the scope specifier in-place. 2920 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2921 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2922 return true; 2923 } 2924 2925 return false; 2926} 2927 2928Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D, 2929 bool IsFunctionDefinition) { 2930 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 2931 IsFunctionDefinition); 2932} 2933 2934/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 2935/// If T is the name of a class, then each of the following shall have a 2936/// name different from T: 2937/// - every static data member of class T; 2938/// - every member function of class T 2939/// - every member of class T that is itself a type; 2940/// \returns true if the declaration name violates these rules. 2941bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 2942 DeclarationNameInfo NameInfo) { 2943 DeclarationName Name = NameInfo.getName(); 2944 2945 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 2946 if (Record->getIdentifier() && Record->getDeclName() == Name) { 2947 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 2948 return true; 2949 } 2950 2951 return false; 2952} 2953 2954Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2955 MultiTemplateParamsArg TemplateParamLists, 2956 bool IsFunctionDefinition) { 2957 // TODO: consider using NameInfo for diagnostic. 2958 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2959 DeclarationName Name = NameInfo.getName(); 2960 2961 // All of these full declarators require an identifier. If it doesn't have 2962 // one, the ParsedFreeStandingDeclSpec action should be used. 2963 if (!Name) { 2964 if (!D.isInvalidType()) // Reject this if we think it is valid. 2965 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2966 diag::err_declarator_need_ident) 2967 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2968 return 0; 2969 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 2970 return 0; 2971 2972 // The scope passed in may not be a decl scope. Zip up the scope tree until 2973 // we find one that is. 2974 while ((S->getFlags() & Scope::DeclScope) == 0 || 2975 (S->getFlags() & Scope::TemplateParamScope) != 0) 2976 S = S->getParent(); 2977 2978 DeclContext *DC = CurContext; 2979 if (D.getCXXScopeSpec().isInvalid()) 2980 D.setInvalidType(); 2981 else if (D.getCXXScopeSpec().isSet()) { 2982 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 2983 UPPC_DeclarationQualifier)) 2984 return 0; 2985 2986 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2987 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2988 if (!DC) { 2989 // If we could not compute the declaration context, it's because the 2990 // declaration context is dependent but does not refer to a class, 2991 // class template, or class template partial specialization. Complain 2992 // and return early, to avoid the coming semantic disaster. 2993 Diag(D.getIdentifierLoc(), 2994 diag::err_template_qualified_declarator_no_match) 2995 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2996 << D.getCXXScopeSpec().getRange(); 2997 return 0; 2998 } 2999 bool IsDependentContext = DC->isDependentContext(); 3000 3001 if (!IsDependentContext && 3002 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3003 return 0; 3004 3005 if (isa<CXXRecordDecl>(DC)) { 3006 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3007 Diag(D.getIdentifierLoc(), 3008 diag::err_member_def_undefined_record) 3009 << Name << DC << D.getCXXScopeSpec().getRange(); 3010 D.setInvalidType(); 3011 } else if (isa<CXXRecordDecl>(CurContext) && 3012 !D.getDeclSpec().isFriendSpecified()) { 3013 // The user provided a superfluous scope specifier inside a class 3014 // definition: 3015 // 3016 // class X { 3017 // void X::f(); 3018 // }; 3019 if (CurContext->Equals(DC)) 3020 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3021 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3022 else 3023 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3024 << Name << D.getCXXScopeSpec().getRange(); 3025 3026 // Pretend that this qualifier was not here. 3027 D.getCXXScopeSpec().clear(); 3028 } 3029 } 3030 3031 // Check whether we need to rebuild the type of the given 3032 // declaration in the current instantiation. 3033 if (EnteringContext && IsDependentContext && 3034 TemplateParamLists.size() != 0) { 3035 ContextRAII SavedContext(*this, DC); 3036 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3037 D.setInvalidType(); 3038 } 3039 } 3040 3041 if (DiagnoseClassNameShadow(DC, NameInfo)) 3042 // If this is a typedef, we'll end up spewing multiple diagnostics. 3043 // Just return early; it's safer. 3044 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3045 return 0; 3046 3047 NamedDecl *New; 3048 3049 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3050 QualType R = TInfo->getType(); 3051 3052 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3053 UPPC_DeclarationType)) 3054 D.setInvalidType(); 3055 3056 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3057 ForRedeclaration); 3058 3059 // See if this is a redefinition of a variable in the same scope. 3060 if (!D.getCXXScopeSpec().isSet()) { 3061 bool IsLinkageLookup = false; 3062 3063 // If the declaration we're planning to build will be a function 3064 // or object with linkage, then look for another declaration with 3065 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3066 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3067 /* Do nothing*/; 3068 else if (R->isFunctionType()) { 3069 if (CurContext->isFunctionOrMethod() || 3070 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3071 IsLinkageLookup = true; 3072 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3073 IsLinkageLookup = true; 3074 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3075 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3076 IsLinkageLookup = true; 3077 3078 if (IsLinkageLookup) 3079 Previous.clear(LookupRedeclarationWithLinkage); 3080 3081 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3082 } else { // Something like "int foo::x;" 3083 LookupQualifiedName(Previous, DC); 3084 3085 // Don't consider using declarations as previous declarations for 3086 // out-of-line members. 3087 RemoveUsingDecls(Previous); 3088 3089 // C++ 7.3.1.2p2: 3090 // Members (including explicit specializations of templates) of a named 3091 // namespace can also be defined outside that namespace by explicit 3092 // qualification of the name being defined, provided that the entity being 3093 // defined was already declared in the namespace and the definition appears 3094 // after the point of declaration in a namespace that encloses the 3095 // declarations namespace. 3096 // 3097 // Note that we only check the context at this point. We don't yet 3098 // have enough information to make sure that PrevDecl is actually 3099 // the declaration we want to match. For example, given: 3100 // 3101 // class X { 3102 // void f(); 3103 // void f(float); 3104 // }; 3105 // 3106 // void X::f(int) { } // ill-formed 3107 // 3108 // In this case, PrevDecl will point to the overload set 3109 // containing the two f's declared in X, but neither of them 3110 // matches. 3111 3112 // First check whether we named the global scope. 3113 if (isa<TranslationUnitDecl>(DC)) { 3114 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3115 << Name << D.getCXXScopeSpec().getRange(); 3116 } else { 3117 DeclContext *Cur = CurContext; 3118 while (isa<LinkageSpecDecl>(Cur)) 3119 Cur = Cur->getParent(); 3120 if (!Cur->Encloses(DC)) { 3121 // The qualifying scope doesn't enclose the original declaration. 3122 // Emit diagnostic based on current scope. 3123 SourceLocation L = D.getIdentifierLoc(); 3124 SourceRange R = D.getCXXScopeSpec().getRange(); 3125 if (isa<FunctionDecl>(Cur)) 3126 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3127 else 3128 Diag(L, diag::err_invalid_declarator_scope) 3129 << Name << cast<NamedDecl>(DC) << R; 3130 D.setInvalidType(); 3131 } 3132 } 3133 } 3134 3135 if (Previous.isSingleResult() && 3136 Previous.getFoundDecl()->isTemplateParameter()) { 3137 // Maybe we will complain about the shadowed template parameter. 3138 if (!D.isInvalidType()) 3139 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3140 Previous.getFoundDecl())) 3141 D.setInvalidType(); 3142 3143 // Just pretend that we didn't see the previous declaration. 3144 Previous.clear(); 3145 } 3146 3147 // In C++, the previous declaration we find might be a tag type 3148 // (class or enum). In this case, the new declaration will hide the 3149 // tag type. Note that this does does not apply if we're declaring a 3150 // typedef (C++ [dcl.typedef]p4). 3151 if (Previous.isSingleTagDecl() && 3152 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3153 Previous.clear(); 3154 3155 bool Redeclaration = false; 3156 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3157 if (TemplateParamLists.size()) { 3158 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3159 return 0; 3160 } 3161 3162 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3163 } else if (R->isFunctionType()) { 3164 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3165 move(TemplateParamLists), 3166 IsFunctionDefinition, Redeclaration); 3167 } else { 3168 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3169 move(TemplateParamLists), 3170 Redeclaration); 3171 } 3172 3173 if (New == 0) 3174 return 0; 3175 3176 // If this has an identifier and is not an invalid redeclaration or 3177 // function template specialization, add it to the scope stack. 3178 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 3179 PushOnScopeChains(New, S); 3180 3181 return New; 3182} 3183 3184/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3185/// types into constant array types in certain situations which would otherwise 3186/// be errors (for GCC compatibility). 3187static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3188 ASTContext &Context, 3189 bool &SizeIsNegative, 3190 llvm::APSInt &Oversized) { 3191 // This method tries to turn a variable array into a constant 3192 // array even when the size isn't an ICE. This is necessary 3193 // for compatibility with code that depends on gcc's buggy 3194 // constant expression folding, like struct {char x[(int)(char*)2];} 3195 SizeIsNegative = false; 3196 Oversized = 0; 3197 3198 if (T->isDependentType()) 3199 return QualType(); 3200 3201 QualifierCollector Qs; 3202 const Type *Ty = Qs.strip(T); 3203 3204 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3205 QualType Pointee = PTy->getPointeeType(); 3206 QualType FixedType = 3207 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3208 Oversized); 3209 if (FixedType.isNull()) return FixedType; 3210 FixedType = Context.getPointerType(FixedType); 3211 return Qs.apply(Context, FixedType); 3212 } 3213 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3214 QualType Inner = PTy->getInnerType(); 3215 QualType FixedType = 3216 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3217 Oversized); 3218 if (FixedType.isNull()) return FixedType; 3219 FixedType = Context.getParenType(FixedType); 3220 return Qs.apply(Context, FixedType); 3221 } 3222 3223 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3224 if (!VLATy) 3225 return QualType(); 3226 // FIXME: We should probably handle this case 3227 if (VLATy->getElementType()->isVariablyModifiedType()) 3228 return QualType(); 3229 3230 Expr::EvalResult EvalResult; 3231 if (!VLATy->getSizeExpr() || 3232 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3233 !EvalResult.Val.isInt()) 3234 return QualType(); 3235 3236 // Check whether the array size is negative. 3237 llvm::APSInt &Res = EvalResult.Val.getInt(); 3238 if (Res.isSigned() && Res.isNegative()) { 3239 SizeIsNegative = true; 3240 return QualType(); 3241 } 3242 3243 // Check whether the array is too large to be addressed. 3244 unsigned ActiveSizeBits 3245 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3246 Res); 3247 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3248 Oversized = Res; 3249 return QualType(); 3250 } 3251 3252 return Context.getConstantArrayType(VLATy->getElementType(), 3253 Res, ArrayType::Normal, 0); 3254} 3255 3256/// \brief Register the given locally-scoped external C declaration so 3257/// that it can be found later for redeclarations 3258void 3259Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3260 const LookupResult &Previous, 3261 Scope *S) { 3262 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3263 "Decl is not a locally-scoped decl!"); 3264 // Note that we have a locally-scoped external with this name. 3265 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3266 3267 if (!Previous.isSingleResult()) 3268 return; 3269 3270 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3271 3272 // If there was a previous declaration of this variable, it may be 3273 // in our identifier chain. Update the identifier chain with the new 3274 // declaration. 3275 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3276 // The previous declaration was found on the identifer resolver 3277 // chain, so remove it from its scope. 3278 while (S && !S->isDeclScope(PrevDecl)) 3279 S = S->getParent(); 3280 3281 if (S) 3282 S->RemoveDecl(PrevDecl); 3283 } 3284} 3285 3286/// \brief Diagnose function specifiers on a declaration of an identifier that 3287/// does not identify a function. 3288void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3289 // FIXME: We should probably indicate the identifier in question to avoid 3290 // confusion for constructs like "inline int a(), b;" 3291 if (D.getDeclSpec().isInlineSpecified()) 3292 Diag(D.getDeclSpec().getInlineSpecLoc(), 3293 diag::err_inline_non_function); 3294 3295 if (D.getDeclSpec().isVirtualSpecified()) 3296 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3297 diag::err_virtual_non_function); 3298 3299 if (D.getDeclSpec().isExplicitSpecified()) 3300 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3301 diag::err_explicit_non_function); 3302} 3303 3304NamedDecl* 3305Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3306 QualType R, TypeSourceInfo *TInfo, 3307 LookupResult &Previous, bool &Redeclaration) { 3308 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3309 if (D.getCXXScopeSpec().isSet()) { 3310 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3311 << D.getCXXScopeSpec().getRange(); 3312 D.setInvalidType(); 3313 // Pretend we didn't see the scope specifier. 3314 DC = CurContext; 3315 Previous.clear(); 3316 } 3317 3318 if (getLangOptions().CPlusPlus) { 3319 // Check that there are no default arguments (C++ only). 3320 CheckExtraCXXDefaultArguments(D); 3321 } 3322 3323 DiagnoseFunctionSpecifiers(D); 3324 3325 if (D.getDeclSpec().isThreadSpecified()) 3326 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3327 3328 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3329 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3330 << D.getName().getSourceRange(); 3331 return 0; 3332 } 3333 3334 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3335 if (!NewTD) return 0; 3336 3337 // Handle attributes prior to checking for duplicates in MergeVarDecl 3338 ProcessDeclAttributes(S, NewTD, D); 3339 3340 CheckTypedefForVariablyModifiedType(S, NewTD); 3341 3342 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3343} 3344 3345void 3346Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3347 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3348 // then it shall have block scope. 3349 // Note that variably modified types must be fixed before merging the decl so 3350 // that redeclarations will match. 3351 QualType T = NewTD->getUnderlyingType(); 3352 if (T->isVariablyModifiedType()) { 3353 getCurFunction()->setHasBranchProtectedScope(); 3354 3355 if (S->getFnParent() == 0) { 3356 bool SizeIsNegative; 3357 llvm::APSInt Oversized; 3358 QualType FixedTy = 3359 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3360 Oversized); 3361 if (!FixedTy.isNull()) { 3362 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3363 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3364 } else { 3365 if (SizeIsNegative) 3366 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3367 else if (T->isVariableArrayType()) 3368 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3369 else if (Oversized.getBoolValue()) 3370 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3371 else 3372 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3373 NewTD->setInvalidDecl(); 3374 } 3375 } 3376 } 3377} 3378 3379 3380/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3381/// declares a typedef-name, either using the 'typedef' type specifier or via 3382/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3383NamedDecl* 3384Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3385 LookupResult &Previous, bool &Redeclaration) { 3386 // Merge the decl with the existing one if appropriate. If the decl is 3387 // in an outer scope, it isn't the same thing. 3388 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3389 /*ExplicitInstantiationOrSpecialization=*/false); 3390 if (!Previous.empty()) { 3391 Redeclaration = true; 3392 MergeTypedefNameDecl(NewTD, Previous); 3393 } 3394 3395 // If this is the C FILE type, notify the AST context. 3396 if (IdentifierInfo *II = NewTD->getIdentifier()) 3397 if (!NewTD->isInvalidDecl() && 3398 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3399 if (II->isStr("FILE")) 3400 Context.setFILEDecl(NewTD); 3401 else if (II->isStr("jmp_buf")) 3402 Context.setjmp_bufDecl(NewTD); 3403 else if (II->isStr("sigjmp_buf")) 3404 Context.setsigjmp_bufDecl(NewTD); 3405 else if (II->isStr("__builtin_va_list")) 3406 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3407 } 3408 3409 return NewTD; 3410} 3411 3412/// \brief Determines whether the given declaration is an out-of-scope 3413/// previous declaration. 3414/// 3415/// This routine should be invoked when name lookup has found a 3416/// previous declaration (PrevDecl) that is not in the scope where a 3417/// new declaration by the same name is being introduced. If the new 3418/// declaration occurs in a local scope, previous declarations with 3419/// linkage may still be considered previous declarations (C99 3420/// 6.2.2p4-5, C++ [basic.link]p6). 3421/// 3422/// \param PrevDecl the previous declaration found by name 3423/// lookup 3424/// 3425/// \param DC the context in which the new declaration is being 3426/// declared. 3427/// 3428/// \returns true if PrevDecl is an out-of-scope previous declaration 3429/// for a new delcaration with the same name. 3430static bool 3431isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3432 ASTContext &Context) { 3433 if (!PrevDecl) 3434 return false; 3435 3436 if (!PrevDecl->hasLinkage()) 3437 return false; 3438 3439 if (Context.getLangOptions().CPlusPlus) { 3440 // C++ [basic.link]p6: 3441 // If there is a visible declaration of an entity with linkage 3442 // having the same name and type, ignoring entities declared 3443 // outside the innermost enclosing namespace scope, the block 3444 // scope declaration declares that same entity and receives the 3445 // linkage of the previous declaration. 3446 DeclContext *OuterContext = DC->getRedeclContext(); 3447 if (!OuterContext->isFunctionOrMethod()) 3448 // This rule only applies to block-scope declarations. 3449 return false; 3450 3451 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3452 if (PrevOuterContext->isRecord()) 3453 // We found a member function: ignore it. 3454 return false; 3455 3456 // Find the innermost enclosing namespace for the new and 3457 // previous declarations. 3458 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3459 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3460 3461 // The previous declaration is in a different namespace, so it 3462 // isn't the same function. 3463 if (!OuterContext->Equals(PrevOuterContext)) 3464 return false; 3465 } 3466 3467 return true; 3468} 3469 3470static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3471 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3472 if (!SS.isSet()) return; 3473 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3474} 3475 3476NamedDecl* 3477Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3478 QualType R, TypeSourceInfo *TInfo, 3479 LookupResult &Previous, 3480 MultiTemplateParamsArg TemplateParamLists, 3481 bool &Redeclaration) { 3482 DeclarationName Name = GetNameForDeclarator(D).getName(); 3483 3484 // Check that there are no default arguments (C++ only). 3485 if (getLangOptions().CPlusPlus) 3486 CheckExtraCXXDefaultArguments(D); 3487 3488 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3489 assert(SCSpec != DeclSpec::SCS_typedef && 3490 "Parser allowed 'typedef' as storage class VarDecl."); 3491 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3492 if (SCSpec == DeclSpec::SCS_mutable) { 3493 // mutable can only appear on non-static class members, so it's always 3494 // an error here 3495 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3496 D.setInvalidType(); 3497 SC = SC_None; 3498 } 3499 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3500 VarDecl::StorageClass SCAsWritten 3501 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3502 3503 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3504 if (!II) { 3505 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3506 << Name.getAsString(); 3507 return 0; 3508 } 3509 3510 DiagnoseFunctionSpecifiers(D); 3511 3512 if (!DC->isRecord() && S->getFnParent() == 0) { 3513 // C99 6.9p2: The storage-class specifiers auto and register shall not 3514 // appear in the declaration specifiers in an external declaration. 3515 if (SC == SC_Auto || SC == SC_Register) { 3516 3517 // If this is a register variable with an asm label specified, then this 3518 // is a GNU extension. 3519 if (SC == SC_Register && D.getAsmLabel()) 3520 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3521 else 3522 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3523 D.setInvalidType(); 3524 } 3525 } 3526 3527 bool isExplicitSpecialization = false; 3528 VarDecl *NewVD; 3529 if (!getLangOptions().CPlusPlus) { 3530 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3531 D.getIdentifierLoc(), II, 3532 R, TInfo, SC, SCAsWritten); 3533 3534 if (D.isInvalidType()) 3535 NewVD->setInvalidDecl(); 3536 } else { 3537 if (DC->isRecord() && !CurContext->isRecord()) { 3538 // This is an out-of-line definition of a static data member. 3539 if (SC == SC_Static) { 3540 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3541 diag::err_static_out_of_line) 3542 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3543 } else if (SC == SC_None) 3544 SC = SC_Static; 3545 } 3546 if (SC == SC_Static) { 3547 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3548 if (RD->isLocalClass()) 3549 Diag(D.getIdentifierLoc(), 3550 diag::err_static_data_member_not_allowed_in_local_class) 3551 << Name << RD->getDeclName(); 3552 3553 // C++ [class.union]p1: If a union contains a static data member, 3554 // the program is ill-formed. 3555 // 3556 // We also disallow static data members in anonymous structs. 3557 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3558 Diag(D.getIdentifierLoc(), 3559 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3560 << Name << RD->isUnion(); 3561 } 3562 } 3563 3564 // Match up the template parameter lists with the scope specifier, then 3565 // determine whether we have a template or a template specialization. 3566 isExplicitSpecialization = false; 3567 bool Invalid = false; 3568 if (TemplateParameterList *TemplateParams 3569 = MatchTemplateParametersToScopeSpecifier( 3570 D.getDeclSpec().getSourceRange().getBegin(), 3571 D.getIdentifierLoc(), 3572 D.getCXXScopeSpec(), 3573 TemplateParamLists.get(), 3574 TemplateParamLists.size(), 3575 /*never a friend*/ false, 3576 isExplicitSpecialization, 3577 Invalid)) { 3578 if (TemplateParams->size() > 0) { 3579 // There is no such thing as a variable template. 3580 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3581 << II 3582 << SourceRange(TemplateParams->getTemplateLoc(), 3583 TemplateParams->getRAngleLoc()); 3584 return 0; 3585 } else { 3586 // There is an extraneous 'template<>' for this variable. Complain 3587 // about it, but allow the declaration of the variable. 3588 Diag(TemplateParams->getTemplateLoc(), 3589 diag::err_template_variable_noparams) 3590 << II 3591 << SourceRange(TemplateParams->getTemplateLoc(), 3592 TemplateParams->getRAngleLoc()); 3593 } 3594 } 3595 3596 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3597 D.getIdentifierLoc(), II, 3598 R, TInfo, SC, SCAsWritten); 3599 3600 // If this decl has an auto type in need of deduction, make a note of the 3601 // Decl so we can diagnose uses of it in its own initializer. 3602 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3603 R->getContainedAutoType()) 3604 ParsingInitForAutoVars.insert(NewVD); 3605 3606 if (D.isInvalidType() || Invalid) 3607 NewVD->setInvalidDecl(); 3608 3609 SetNestedNameSpecifier(NewVD, D); 3610 3611 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3612 NewVD->setTemplateParameterListsInfo(Context, 3613 TemplateParamLists.size(), 3614 TemplateParamLists.release()); 3615 } 3616 } 3617 3618 if (D.getDeclSpec().isThreadSpecified()) { 3619 if (NewVD->hasLocalStorage()) 3620 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3621 else if (!Context.Target.isTLSSupported()) 3622 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3623 else 3624 NewVD->setThreadSpecified(true); 3625 } 3626 3627 // Set the lexical context. If the declarator has a C++ scope specifier, the 3628 // lexical context will be different from the semantic context. 3629 NewVD->setLexicalDeclContext(CurContext); 3630 3631 // Handle attributes prior to checking for duplicates in MergeVarDecl 3632 ProcessDeclAttributes(S, NewVD, D); 3633 3634 // Handle GNU asm-label extension (encoded as an attribute). 3635 if (Expr *E = (Expr*)D.getAsmLabel()) { 3636 // The parser guarantees this is a string. 3637 StringLiteral *SE = cast<StringLiteral>(E); 3638 llvm::StringRef Label = SE->getString(); 3639 if (S->getFnParent() != 0) { 3640 switch (SC) { 3641 case SC_None: 3642 case SC_Auto: 3643 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3644 break; 3645 case SC_Register: 3646 if (!Context.Target.isValidGCCRegisterName(Label)) 3647 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3648 break; 3649 case SC_Static: 3650 case SC_Extern: 3651 case SC_PrivateExtern: 3652 break; 3653 } 3654 } 3655 3656 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3657 Context, Label)); 3658 } 3659 3660 // Diagnose shadowed variables before filtering for scope. 3661 if (!D.getCXXScopeSpec().isSet()) 3662 CheckShadow(S, NewVD, Previous); 3663 3664 // Don't consider existing declarations that are in a different 3665 // scope and are out-of-semantic-context declarations (if the new 3666 // declaration has linkage). 3667 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3668 isExplicitSpecialization); 3669 3670 if (!getLangOptions().CPlusPlus) 3671 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3672 else { 3673 // Merge the decl with the existing one if appropriate. 3674 if (!Previous.empty()) { 3675 if (Previous.isSingleResult() && 3676 isa<FieldDecl>(Previous.getFoundDecl()) && 3677 D.getCXXScopeSpec().isSet()) { 3678 // The user tried to define a non-static data member 3679 // out-of-line (C++ [dcl.meaning]p1). 3680 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3681 << D.getCXXScopeSpec().getRange(); 3682 Previous.clear(); 3683 NewVD->setInvalidDecl(); 3684 } 3685 } else if (D.getCXXScopeSpec().isSet()) { 3686 // No previous declaration in the qualifying scope. 3687 Diag(D.getIdentifierLoc(), diag::err_no_member) 3688 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3689 << D.getCXXScopeSpec().getRange(); 3690 NewVD->setInvalidDecl(); 3691 } 3692 3693 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3694 3695 // This is an explicit specialization of a static data member. Check it. 3696 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3697 CheckMemberSpecialization(NewVD, Previous)) 3698 NewVD->setInvalidDecl(); 3699 } 3700 3701 // attributes declared post-definition are currently ignored 3702 // FIXME: This should be handled in attribute merging, not 3703 // here. 3704 if (Previous.isSingleResult()) { 3705 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3706 if (Def && (Def = Def->getDefinition()) && 3707 Def != NewVD && D.hasAttributes()) { 3708 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3709 Diag(Def->getLocation(), diag::note_previous_definition); 3710 } 3711 } 3712 3713 // If this is a locally-scoped extern C variable, update the map of 3714 // such variables. 3715 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3716 !NewVD->isInvalidDecl()) 3717 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3718 3719 // If there's a #pragma GCC visibility in scope, and this isn't a class 3720 // member, set the visibility of this variable. 3721 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3722 AddPushedVisibilityAttribute(NewVD); 3723 3724 MarkUnusedFileScopedDecl(NewVD); 3725 3726 return NewVD; 3727} 3728 3729/// \brief Diagnose variable or built-in function shadowing. Implements 3730/// -Wshadow. 3731/// 3732/// This method is called whenever a VarDecl is added to a "useful" 3733/// scope. 3734/// 3735/// \param S the scope in which the shadowing name is being declared 3736/// \param R the lookup of the name 3737/// 3738void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3739 // Return if warning is ignored. 3740 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3741 Diagnostic::Ignored) 3742 return; 3743 3744 // Don't diagnose declarations at file scope. 3745 if (D->hasGlobalStorage()) 3746 return; 3747 3748 DeclContext *NewDC = D->getDeclContext(); 3749 3750 // Only diagnose if we're shadowing an unambiguous field or variable. 3751 if (R.getResultKind() != LookupResult::Found) 3752 return; 3753 3754 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3755 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3756 return; 3757 3758 // Fields are not shadowed by variables in C++ static methods. 3759 if (isa<FieldDecl>(ShadowedDecl)) 3760 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 3761 if (MD->isStatic()) 3762 return; 3763 3764 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 3765 if (shadowedVar->isExternC()) { 3766 // For shadowing external vars, make sure that we point to the global 3767 // declaration, not a locally scoped extern declaration. 3768 for (VarDecl::redecl_iterator 3769 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 3770 I != E; ++I) 3771 if (I->isFileVarDecl()) { 3772 ShadowedDecl = *I; 3773 break; 3774 } 3775 } 3776 3777 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3778 3779 // Only warn about certain kinds of shadowing for class members. 3780 if (NewDC && NewDC->isRecord()) { 3781 // In particular, don't warn about shadowing non-class members. 3782 if (!OldDC->isRecord()) 3783 return; 3784 3785 // TODO: should we warn about static data members shadowing 3786 // static data members from base classes? 3787 3788 // TODO: don't diagnose for inaccessible shadowed members. 3789 // This is hard to do perfectly because we might friend the 3790 // shadowing context, but that's just a false negative. 3791 } 3792 3793 // Determine what kind of declaration we're shadowing. 3794 unsigned Kind; 3795 if (isa<RecordDecl>(OldDC)) { 3796 if (isa<FieldDecl>(ShadowedDecl)) 3797 Kind = 3; // field 3798 else 3799 Kind = 2; // static data member 3800 } else if (OldDC->isFileContext()) 3801 Kind = 1; // global 3802 else 3803 Kind = 0; // local 3804 3805 DeclarationName Name = R.getLookupName(); 3806 3807 // Emit warning and note. 3808 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3809 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3810} 3811 3812/// \brief Check -Wshadow without the advantage of a previous lookup. 3813void Sema::CheckShadow(Scope *S, VarDecl *D) { 3814 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 3815 Diagnostic::Ignored) 3816 return; 3817 3818 LookupResult R(*this, D->getDeclName(), D->getLocation(), 3819 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3820 LookupName(R, S); 3821 CheckShadow(S, D, R); 3822} 3823 3824/// \brief Perform semantic checking on a newly-created variable 3825/// declaration. 3826/// 3827/// This routine performs all of the type-checking required for a 3828/// variable declaration once it has been built. It is used both to 3829/// check variables after they have been parsed and their declarators 3830/// have been translated into a declaration, and to check variables 3831/// that have been instantiated from a template. 3832/// 3833/// Sets NewVD->isInvalidDecl() if an error was encountered. 3834void Sema::CheckVariableDeclaration(VarDecl *NewVD, 3835 LookupResult &Previous, 3836 bool &Redeclaration) { 3837 // If the decl is already known invalid, don't check it. 3838 if (NewVD->isInvalidDecl()) 3839 return; 3840 3841 QualType T = NewVD->getType(); 3842 3843 if (T->isObjCObjectType()) { 3844 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 3845 return NewVD->setInvalidDecl(); 3846 } 3847 3848 // Emit an error if an address space was applied to decl with local storage. 3849 // This includes arrays of objects with address space qualifiers, but not 3850 // automatic variables that point to other address spaces. 3851 // ISO/IEC TR 18037 S5.1.2 3852 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 3853 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 3854 return NewVD->setInvalidDecl(); 3855 } 3856 3857 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 3858 && !NewVD->hasAttr<BlocksAttr>()) { 3859 if (getLangOptions().getGCMode() != LangOptions::NonGC) 3860 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 3861 else 3862 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 3863 } 3864 3865 bool isVM = T->isVariablyModifiedType(); 3866 if (isVM || NewVD->hasAttr<CleanupAttr>() || 3867 NewVD->hasAttr<BlocksAttr>()) 3868 getCurFunction()->setHasBranchProtectedScope(); 3869 3870 if ((isVM && NewVD->hasLinkage()) || 3871 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3872 bool SizeIsNegative; 3873 llvm::APSInt Oversized; 3874 QualType FixedTy = 3875 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3876 Oversized); 3877 3878 if (FixedTy.isNull() && T->isVariableArrayType()) { 3879 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3880 // FIXME: This won't give the correct result for 3881 // int a[10][n]; 3882 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3883 3884 if (NewVD->isFileVarDecl()) 3885 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3886 << SizeRange; 3887 else if (NewVD->getStorageClass() == SC_Static) 3888 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3889 << SizeRange; 3890 else 3891 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3892 << SizeRange; 3893 return NewVD->setInvalidDecl(); 3894 } 3895 3896 if (FixedTy.isNull()) { 3897 if (NewVD->isFileVarDecl()) 3898 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3899 else 3900 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3901 return NewVD->setInvalidDecl(); 3902 } 3903 3904 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3905 NewVD->setType(FixedTy); 3906 } 3907 3908 if (Previous.empty() && NewVD->isExternC()) { 3909 // Since we did not find anything by this name and we're declaring 3910 // an extern "C" variable, look for a non-visible extern "C" 3911 // declaration with the same name. 3912 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3913 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3914 if (Pos != LocallyScopedExternalDecls.end()) 3915 Previous.addDecl(Pos->second); 3916 } 3917 3918 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3919 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3920 << T; 3921 return NewVD->setInvalidDecl(); 3922 } 3923 3924 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3925 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3926 return NewVD->setInvalidDecl(); 3927 } 3928 3929 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3930 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3931 return NewVD->setInvalidDecl(); 3932 } 3933 3934 // Function pointers and references cannot have qualified function type, only 3935 // function pointer-to-members can do that. 3936 QualType Pointee; 3937 unsigned PtrOrRef = 0; 3938 if (const PointerType *Ptr = T->getAs<PointerType>()) 3939 Pointee = Ptr->getPointeeType(); 3940 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3941 Pointee = Ref->getPointeeType(); 3942 PtrOrRef = 1; 3943 } 3944 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3945 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3946 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3947 << PtrOrRef; 3948 return NewVD->setInvalidDecl(); 3949 } 3950 3951 if (!Previous.empty()) { 3952 Redeclaration = true; 3953 MergeVarDecl(NewVD, Previous); 3954 } 3955} 3956 3957/// \brief Data used with FindOverriddenMethod 3958struct FindOverriddenMethodData { 3959 Sema *S; 3960 CXXMethodDecl *Method; 3961}; 3962 3963/// \brief Member lookup function that determines whether a given C++ 3964/// method overrides a method in a base class, to be used with 3965/// CXXRecordDecl::lookupInBases(). 3966static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3967 CXXBasePath &Path, 3968 void *UserData) { 3969 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3970 3971 FindOverriddenMethodData *Data 3972 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3973 3974 DeclarationName Name = Data->Method->getDeclName(); 3975 3976 // FIXME: Do we care about other names here too? 3977 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3978 // We really want to find the base class destructor here. 3979 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3980 CanQualType CT = Data->S->Context.getCanonicalType(T); 3981 3982 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3983 } 3984 3985 for (Path.Decls = BaseRecord->lookup(Name); 3986 Path.Decls.first != Path.Decls.second; 3987 ++Path.Decls.first) { 3988 NamedDecl *D = *Path.Decls.first; 3989 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3990 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3991 return true; 3992 } 3993 } 3994 3995 return false; 3996} 3997 3998/// AddOverriddenMethods - See if a method overrides any in the base classes, 3999/// and if so, check that it's a valid override and remember it. 4000bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4001 // Look for virtual methods in base classes that this method might override. 4002 CXXBasePaths Paths; 4003 FindOverriddenMethodData Data; 4004 Data.Method = MD; 4005 Data.S = this; 4006 bool AddedAny = false; 4007 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4008 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4009 E = Paths.found_decls_end(); I != E; ++I) { 4010 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4011 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4012 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4013 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4014 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4015 AddedAny = true; 4016 } 4017 } 4018 } 4019 } 4020 4021 return AddedAny; 4022} 4023 4024static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD) { 4025 LookupResult Prev(S, NewFD->getDeclName(), NewFD->getLocation(), 4026 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4027 S.LookupQualifiedName(Prev, NewFD->getDeclContext()); 4028 assert(!Prev.isAmbiguous() && 4029 "Cannot have an ambiguity in previous-declaration lookup"); 4030 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4031 Func != FuncEnd; ++Func) { 4032 if (isa<FunctionDecl>(*Func) && 4033 isNearlyMatchingFunction(S.Context, cast<FunctionDecl>(*Func), NewFD)) 4034 S.Diag((*Func)->getLocation(), diag::note_member_def_close_match); 4035 } 4036} 4037 4038NamedDecl* 4039Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 4040 QualType R, TypeSourceInfo *TInfo, 4041 LookupResult &Previous, 4042 MultiTemplateParamsArg TemplateParamLists, 4043 bool IsFunctionDefinition, bool &Redeclaration) { 4044 assert(R.getTypePtr()->isFunctionType()); 4045 4046 // TODO: consider using NameInfo for diagnostic. 4047 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4048 DeclarationName Name = NameInfo.getName(); 4049 FunctionDecl::StorageClass SC = SC_None; 4050 switch (D.getDeclSpec().getStorageClassSpec()) { 4051 default: assert(0 && "Unknown storage class!"); 4052 case DeclSpec::SCS_auto: 4053 case DeclSpec::SCS_register: 4054 case DeclSpec::SCS_mutable: 4055 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4056 diag::err_typecheck_sclass_func); 4057 D.setInvalidType(); 4058 break; 4059 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4060 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4061 case DeclSpec::SCS_static: { 4062 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4063 // C99 6.7.1p5: 4064 // The declaration of an identifier for a function that has 4065 // block scope shall have no explicit storage-class specifier 4066 // other than extern 4067 // See also (C++ [dcl.stc]p4). 4068 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4069 diag::err_static_block_func); 4070 SC = SC_None; 4071 } else 4072 SC = SC_Static; 4073 break; 4074 } 4075 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4076 } 4077 4078 if (D.getDeclSpec().isThreadSpecified()) 4079 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4080 4081 // Do not allow returning a objc interface by-value. 4082 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4083 Diag(D.getIdentifierLoc(), 4084 diag::err_object_cannot_be_passed_returned_by_value) << 0 4085 << R->getAs<FunctionType>()->getResultType(); 4086 D.setInvalidType(); 4087 } 4088 4089 FunctionDecl *NewFD; 4090 bool isInline = D.getDeclSpec().isInlineSpecified(); 4091 bool isFriend = false; 4092 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4093 FunctionDecl::StorageClass SCAsWritten 4094 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4095 FunctionTemplateDecl *FunctionTemplate = 0; 4096 bool isExplicitSpecialization = false; 4097 bool isFunctionTemplateSpecialization = false; 4098 4099 if (!getLangOptions().CPlusPlus) { 4100 // Determine whether the function was written with a 4101 // prototype. This true when: 4102 // - there is a prototype in the declarator, or 4103 // - the type R of the function is some kind of typedef or other reference 4104 // to a type name (which eventually refers to a function type). 4105 bool HasPrototype = 4106 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4107 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4108 4109 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4110 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4111 HasPrototype); 4112 if (D.isInvalidType()) 4113 NewFD->setInvalidDecl(); 4114 4115 // Set the lexical context. 4116 NewFD->setLexicalDeclContext(CurContext); 4117 // Filter out previous declarations that don't match the scope. 4118 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4119 /*ExplicitInstantiationOrSpecialization=*/false); 4120 } else { 4121 isFriend = D.getDeclSpec().isFriendSpecified(); 4122 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4123 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4124 bool isVirtualOkay = false; 4125 4126 // Check that the return type is not an abstract class type. 4127 // For record types, this is done by the AbstractClassUsageDiagnoser once 4128 // the class has been completely parsed. 4129 if (!DC->isRecord() && 4130 RequireNonAbstractType(D.getIdentifierLoc(), 4131 R->getAs<FunctionType>()->getResultType(), 4132 diag::err_abstract_type_in_decl, 4133 AbstractReturnType)) 4134 D.setInvalidType(); 4135 4136 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4137 // This is a C++ constructor declaration. 4138 assert(DC->isRecord() && 4139 "Constructors can only be declared in a member context"); 4140 4141 R = CheckConstructorDeclarator(D, R, SC); 4142 4143 // Create the new declaration 4144 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4145 Context, 4146 cast<CXXRecordDecl>(DC), 4147 D.getSourceRange().getBegin(), 4148 NameInfo, R, TInfo, 4149 isExplicit, isInline, 4150 /*isImplicitlyDeclared=*/false); 4151 4152 NewFD = NewCD; 4153 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4154 // This is a C++ destructor declaration. 4155 if (DC->isRecord()) { 4156 R = CheckDestructorDeclarator(D, R, SC); 4157 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4158 4159 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4160 D.getSourceRange().getBegin(), 4161 NameInfo, R, TInfo, 4162 isInline, 4163 /*isImplicitlyDeclared=*/false); 4164 NewFD = NewDD; 4165 isVirtualOkay = true; 4166 4167 // If the class is complete, then we now create the implicit exception 4168 // specification. If the class is incomplete or dependent, we can't do 4169 // it yet. 4170 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4171 Record->getDefinition() && !Record->isBeingDefined() && 4172 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4173 AdjustDestructorExceptionSpec(Record, NewDD); 4174 } 4175 4176 } else { 4177 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4178 4179 // Create a FunctionDecl to satisfy the function definition parsing 4180 // code path. 4181 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4182 D.getIdentifierLoc(), Name, R, TInfo, 4183 SC, SCAsWritten, isInline, 4184 /*hasPrototype=*/true); 4185 D.setInvalidType(); 4186 } 4187 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4188 if (!DC->isRecord()) { 4189 Diag(D.getIdentifierLoc(), 4190 diag::err_conv_function_not_member); 4191 return 0; 4192 } 4193 4194 CheckConversionDeclarator(D, R, SC); 4195 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4196 D.getSourceRange().getBegin(), 4197 NameInfo, R, TInfo, 4198 isInline, isExplicit, 4199 SourceLocation()); 4200 4201 isVirtualOkay = true; 4202 } else if (DC->isRecord()) { 4203 // If the of the function is the same as the name of the record, then this 4204 // must be an invalid constructor that has a return type. 4205 // (The parser checks for a return type and makes the declarator a 4206 // constructor if it has no return type). 4207 // must have an invalid constructor that has a return type 4208 if (Name.getAsIdentifierInfo() && 4209 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4210 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4211 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4212 << SourceRange(D.getIdentifierLoc()); 4213 return 0; 4214 } 4215 4216 bool isStatic = SC == SC_Static; 4217 4218 // [class.free]p1: 4219 // Any allocation function for a class T is a static member 4220 // (even if not explicitly declared static). 4221 if (Name.getCXXOverloadedOperator() == OO_New || 4222 Name.getCXXOverloadedOperator() == OO_Array_New) 4223 isStatic = true; 4224 4225 // [class.free]p6 Any deallocation function for a class X is a static member 4226 // (even if not explicitly declared static). 4227 if (Name.getCXXOverloadedOperator() == OO_Delete || 4228 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4229 isStatic = true; 4230 4231 // This is a C++ method declaration. 4232 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4233 Context, cast<CXXRecordDecl>(DC), 4234 D.getSourceRange().getBegin(), 4235 NameInfo, R, TInfo, 4236 isStatic, SCAsWritten, isInline, 4237 SourceLocation()); 4238 NewFD = NewMD; 4239 4240 isVirtualOkay = !isStatic; 4241 } else { 4242 // Determine whether the function was written with a 4243 // prototype. This true when: 4244 // - we're in C++ (where every function has a prototype), 4245 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4246 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4247 true/*HasPrototype*/); 4248 } 4249 4250 if (isFriend && !isInline && IsFunctionDefinition) { 4251 // C++ [class.friend]p5 4252 // A function can be defined in a friend declaration of a 4253 // class . . . . Such a function is implicitly inline. 4254 NewFD->setImplicitlyInline(); 4255 } 4256 4257 SetNestedNameSpecifier(NewFD, D); 4258 isExplicitSpecialization = false; 4259 isFunctionTemplateSpecialization = false; 4260 if (D.isInvalidType()) 4261 NewFD->setInvalidDecl(); 4262 4263 // Set the lexical context. If the declarator has a C++ 4264 // scope specifier, or is the object of a friend declaration, the 4265 // lexical context will be different from the semantic context. 4266 NewFD->setLexicalDeclContext(CurContext); 4267 4268 // Match up the template parameter lists with the scope specifier, then 4269 // determine whether we have a template or a template specialization. 4270 bool Invalid = false; 4271 if (TemplateParameterList *TemplateParams 4272 = MatchTemplateParametersToScopeSpecifier( 4273 D.getDeclSpec().getSourceRange().getBegin(), 4274 D.getIdentifierLoc(), 4275 D.getCXXScopeSpec(), 4276 TemplateParamLists.get(), 4277 TemplateParamLists.size(), 4278 isFriend, 4279 isExplicitSpecialization, 4280 Invalid)) { 4281 if (TemplateParams->size() > 0) { 4282 // This is a function template 4283 4284 // Check that we can declare a template here. 4285 if (CheckTemplateDeclScope(S, TemplateParams)) 4286 return 0; 4287 4288 // A destructor cannot be a template. 4289 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4290 Diag(NewFD->getLocation(), diag::err_destructor_template); 4291 return 0; 4292 } 4293 4294 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4295 NewFD->getLocation(), 4296 Name, TemplateParams, 4297 NewFD); 4298 FunctionTemplate->setLexicalDeclContext(CurContext); 4299 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4300 4301 // For source fidelity, store the other template param lists. 4302 if (TemplateParamLists.size() > 1) { 4303 NewFD->setTemplateParameterListsInfo(Context, 4304 TemplateParamLists.size() - 1, 4305 TemplateParamLists.release()); 4306 } 4307 } else { 4308 // This is a function template specialization. 4309 isFunctionTemplateSpecialization = true; 4310 // For source fidelity, store all the template param lists. 4311 NewFD->setTemplateParameterListsInfo(Context, 4312 TemplateParamLists.size(), 4313 TemplateParamLists.release()); 4314 4315 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4316 if (isFriend) { 4317 // We want to remove the "template<>", found here. 4318 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4319 4320 // If we remove the template<> and the name is not a 4321 // template-id, we're actually silently creating a problem: 4322 // the friend declaration will refer to an untemplated decl, 4323 // and clearly the user wants a template specialization. So 4324 // we need to insert '<>' after the name. 4325 SourceLocation InsertLoc; 4326 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4327 InsertLoc = D.getName().getSourceRange().getEnd(); 4328 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4329 } 4330 4331 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4332 << Name << RemoveRange 4333 << FixItHint::CreateRemoval(RemoveRange) 4334 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4335 } 4336 } 4337 } 4338 else { 4339 // All template param lists were matched against the scope specifier: 4340 // this is NOT (an explicit specialization of) a template. 4341 if (TemplateParamLists.size() > 0) 4342 // For source fidelity, store all the template param lists. 4343 NewFD->setTemplateParameterListsInfo(Context, 4344 TemplateParamLists.size(), 4345 TemplateParamLists.release()); 4346 } 4347 4348 if (Invalid) { 4349 NewFD->setInvalidDecl(); 4350 if (FunctionTemplate) 4351 FunctionTemplate->setInvalidDecl(); 4352 } 4353 4354 // C++ [dcl.fct.spec]p5: 4355 // The virtual specifier shall only be used in declarations of 4356 // nonstatic class member functions that appear within a 4357 // member-specification of a class declaration; see 10.3. 4358 // 4359 if (isVirtual && !NewFD->isInvalidDecl()) { 4360 if (!isVirtualOkay) { 4361 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4362 diag::err_virtual_non_function); 4363 } else if (!CurContext->isRecord()) { 4364 // 'virtual' was specified outside of the class. 4365 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4366 diag::err_virtual_out_of_class) 4367 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4368 } else if (NewFD->getDescribedFunctionTemplate()) { 4369 // C++ [temp.mem]p3: 4370 // A member function template shall not be virtual. 4371 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4372 diag::err_virtual_member_function_template) 4373 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4374 } else { 4375 // Okay: Add virtual to the method. 4376 NewFD->setVirtualAsWritten(true); 4377 } 4378 } 4379 4380 // C++ [dcl.fct.spec]p3: 4381 // The inline specifier shall not appear on a block scope function declaration. 4382 if (isInline && !NewFD->isInvalidDecl()) { 4383 if (CurContext->isFunctionOrMethod()) { 4384 // 'inline' is not allowed on block scope function declaration. 4385 Diag(D.getDeclSpec().getInlineSpecLoc(), 4386 diag::err_inline_declaration_block_scope) << Name 4387 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4388 } 4389 } 4390 4391 // C++ [dcl.fct.spec]p6: 4392 // The explicit specifier shall be used only in the declaration of a 4393 // constructor or conversion function within its class definition; see 12.3.1 4394 // and 12.3.2. 4395 if (isExplicit && !NewFD->isInvalidDecl()) { 4396 if (!CurContext->isRecord()) { 4397 // 'explicit' was specified outside of the class. 4398 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4399 diag::err_explicit_out_of_class) 4400 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4401 } else if (!isa<CXXConstructorDecl>(NewFD) && 4402 !isa<CXXConversionDecl>(NewFD)) { 4403 // 'explicit' was specified on a function that wasn't a constructor 4404 // or conversion function. 4405 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4406 diag::err_explicit_non_ctor_or_conv_function) 4407 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4408 } 4409 } 4410 4411 // Filter out previous declarations that don't match the scope. 4412 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4413 isExplicitSpecialization || 4414 isFunctionTemplateSpecialization); 4415 4416 if (isFriend) { 4417 // For now, claim that the objects have no previous declaration. 4418 if (FunctionTemplate) { 4419 FunctionTemplate->setObjectOfFriendDecl(false); 4420 FunctionTemplate->setAccess(AS_public); 4421 } 4422 NewFD->setObjectOfFriendDecl(false); 4423 NewFD->setAccess(AS_public); 4424 } 4425 4426 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4427 // A method is implicitly inline if it's defined in its class 4428 // definition. 4429 NewFD->setImplicitlyInline(); 4430 } 4431 4432 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4433 !CurContext->isRecord()) { 4434 // C++ [class.static]p1: 4435 // A data or function member of a class may be declared static 4436 // in a class definition, in which case it is a static member of 4437 // the class. 4438 4439 // Complain about the 'static' specifier if it's on an out-of-line 4440 // member function definition. 4441 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4442 diag::err_static_out_of_line) 4443 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4444 } 4445 } 4446 4447 // Handle GNU asm-label extension (encoded as an attribute). 4448 if (Expr *E = (Expr*) D.getAsmLabel()) { 4449 // The parser guarantees this is a string. 4450 StringLiteral *SE = cast<StringLiteral>(E); 4451 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4452 SE->getString())); 4453 } 4454 4455 // Copy the parameter declarations from the declarator D to the function 4456 // declaration NewFD, if they are available. First scavenge them into Params. 4457 llvm::SmallVector<ParmVarDecl*, 16> Params; 4458 if (D.isFunctionDeclarator()) { 4459 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4460 4461 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4462 // function that takes no arguments, not a function that takes a 4463 // single void argument. 4464 // We let through "const void" here because Sema::GetTypeForDeclarator 4465 // already checks for that case. 4466 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4467 FTI.ArgInfo[0].Param && 4468 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4469 // Empty arg list, don't push any params. 4470 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4471 4472 // In C++, the empty parameter-type-list must be spelled "void"; a 4473 // typedef of void is not permitted. 4474 if (getLangOptions().CPlusPlus && 4475 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4476 bool IsTypeAlias = false; 4477 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4478 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4479 else if (const TemplateSpecializationType *TST = 4480 Param->getType()->getAs<TemplateSpecializationType>()) 4481 IsTypeAlias = TST->isTypeAlias(); 4482 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4483 << IsTypeAlias; 4484 } 4485 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4486 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4487 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4488 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4489 Param->setDeclContext(NewFD); 4490 Params.push_back(Param); 4491 4492 if (Param->isInvalidDecl()) 4493 NewFD->setInvalidDecl(); 4494 } 4495 } 4496 4497 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4498 // When we're declaring a function with a typedef, typeof, etc as in the 4499 // following example, we'll need to synthesize (unnamed) 4500 // parameters for use in the declaration. 4501 // 4502 // @code 4503 // typedef void fn(int); 4504 // fn f; 4505 // @endcode 4506 4507 // Synthesize a parameter for each argument type. 4508 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4509 AE = FT->arg_type_end(); AI != AE; ++AI) { 4510 ParmVarDecl *Param = 4511 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4512 Param->setScopeInfo(0, Params.size()); 4513 Params.push_back(Param); 4514 } 4515 } else { 4516 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4517 "Should not need args for typedef of non-prototype fn"); 4518 } 4519 // Finally, we know we have the right number of parameters, install them. 4520 NewFD->setParams(Params.data(), Params.size()); 4521 4522 // Process the non-inheritable attributes on this declaration. 4523 ProcessDeclAttributes(S, NewFD, D, 4524 /*NonInheritable=*/true, /*Inheritable=*/false); 4525 4526 if (!getLangOptions().CPlusPlus) { 4527 // Perform semantic checking on the function declaration. 4528 bool isExplicitSpecialization=false; 4529 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4530 Redeclaration); 4531 assert((NewFD->isInvalidDecl() || !Redeclaration || 4532 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4533 "previous declaration set still overloaded"); 4534 } else { 4535 // If the declarator is a template-id, translate the parser's template 4536 // argument list into our AST format. 4537 bool HasExplicitTemplateArgs = false; 4538 TemplateArgumentListInfo TemplateArgs; 4539 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4540 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4541 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4542 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4543 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4544 TemplateId->getTemplateArgs(), 4545 TemplateId->NumArgs); 4546 translateTemplateArguments(TemplateArgsPtr, 4547 TemplateArgs); 4548 TemplateArgsPtr.release(); 4549 4550 HasExplicitTemplateArgs = true; 4551 4552 if (NewFD->isInvalidDecl()) { 4553 HasExplicitTemplateArgs = false; 4554 } else if (FunctionTemplate) { 4555 // Function template with explicit template arguments. 4556 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4557 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4558 4559 HasExplicitTemplateArgs = false; 4560 } else if (!isFunctionTemplateSpecialization && 4561 !D.getDeclSpec().isFriendSpecified()) { 4562 // We have encountered something that the user meant to be a 4563 // specialization (because it has explicitly-specified template 4564 // arguments) but that was not introduced with a "template<>" (or had 4565 // too few of them). 4566 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4567 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4568 << FixItHint::CreateInsertion( 4569 D.getDeclSpec().getSourceRange().getBegin(), 4570 "template<> "); 4571 isFunctionTemplateSpecialization = true; 4572 } else { 4573 // "friend void foo<>(int);" is an implicit specialization decl. 4574 isFunctionTemplateSpecialization = true; 4575 } 4576 } else if (isFriend && isFunctionTemplateSpecialization) { 4577 // This combination is only possible in a recovery case; the user 4578 // wrote something like: 4579 // template <> friend void foo(int); 4580 // which we're recovering from as if the user had written: 4581 // friend void foo<>(int); 4582 // Go ahead and fake up a template id. 4583 HasExplicitTemplateArgs = true; 4584 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4585 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4586 } 4587 4588 // If it's a friend (and only if it's a friend), it's possible 4589 // that either the specialized function type or the specialized 4590 // template is dependent, and therefore matching will fail. In 4591 // this case, don't check the specialization yet. 4592 if (isFunctionTemplateSpecialization && isFriend && 4593 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4594 assert(HasExplicitTemplateArgs && 4595 "friend function specialization without template args"); 4596 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4597 Previous)) 4598 NewFD->setInvalidDecl(); 4599 } else if (isFunctionTemplateSpecialization) { 4600 if (CurContext->isDependentContext() && CurContext->isRecord() 4601 && !isFriend) { 4602 Diag(NewFD->getLocation(), diag::err_function_specialization_in_class) 4603 << NewFD->getDeclName(); 4604 NewFD->setInvalidDecl(); 4605 return 0; 4606 } else if (CheckFunctionTemplateSpecialization(NewFD, 4607 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 4608 Previous)) 4609 NewFD->setInvalidDecl(); 4610 4611 // C++ [dcl.stc]p1: 4612 // A storage-class-specifier shall not be specified in an explicit 4613 // specialization (14.7.3) 4614 if (SC != SC_None) { 4615 Diag(NewFD->getLocation(), 4616 diag::err_explicit_specialization_storage_class) 4617 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4618 } 4619 4620 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 4621 if (CheckMemberSpecialization(NewFD, Previous)) 4622 NewFD->setInvalidDecl(); 4623 } 4624 4625 // Perform semantic checking on the function declaration. 4626 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4627 Redeclaration); 4628 4629 assert((NewFD->isInvalidDecl() || !Redeclaration || 4630 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4631 "previous declaration set still overloaded"); 4632 4633 NamedDecl *PrincipalDecl = (FunctionTemplate 4634 ? cast<NamedDecl>(FunctionTemplate) 4635 : NewFD); 4636 4637 if (isFriend && Redeclaration) { 4638 AccessSpecifier Access = AS_public; 4639 if (!NewFD->isInvalidDecl()) 4640 Access = NewFD->getPreviousDeclaration()->getAccess(); 4641 4642 NewFD->setAccess(Access); 4643 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 4644 4645 PrincipalDecl->setObjectOfFriendDecl(true); 4646 } 4647 4648 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 4649 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 4650 PrincipalDecl->setNonMemberOperator(); 4651 4652 // If we have a function template, check the template parameter 4653 // list. This will check and merge default template arguments. 4654 if (FunctionTemplate) { 4655 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 4656 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 4657 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 4658 D.getDeclSpec().isFriendSpecified() 4659 ? (IsFunctionDefinition 4660 ? TPC_FriendFunctionTemplateDefinition 4661 : TPC_FriendFunctionTemplate) 4662 : (D.getCXXScopeSpec().isSet() && 4663 DC && DC->isRecord() && 4664 DC->isDependentContext()) 4665 ? TPC_ClassTemplateMember 4666 : TPC_FunctionTemplate); 4667 } 4668 4669 if (NewFD->isInvalidDecl()) { 4670 // Ignore all the rest of this. 4671 } else if (!Redeclaration) { 4672 // Fake up an access specifier if it's supposed to be a class member. 4673 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 4674 NewFD->setAccess(AS_public); 4675 4676 // Qualified decls generally require a previous declaration. 4677 if (D.getCXXScopeSpec().isSet()) { 4678 // ...with the major exception of templated-scope or 4679 // dependent-scope friend declarations. 4680 4681 // TODO: we currently also suppress this check in dependent 4682 // contexts because (1) the parameter depth will be off when 4683 // matching friend templates and (2) we might actually be 4684 // selecting a friend based on a dependent factor. But there 4685 // are situations where these conditions don't apply and we 4686 // can actually do this check immediately. 4687 if (isFriend && 4688 (TemplateParamLists.size() || 4689 D.getCXXScopeSpec().getScopeRep()->isDependent() || 4690 CurContext->isDependentContext())) { 4691 // ignore these 4692 } else { 4693 // The user tried to provide an out-of-line definition for a 4694 // function that is a member of a class or namespace, but there 4695 // was no such member function declared (C++ [class.mfct]p2, 4696 // C++ [namespace.memdef]p2). For example: 4697 // 4698 // class X { 4699 // void f() const; 4700 // }; 4701 // 4702 // void X::f() { } // ill-formed 4703 // 4704 // Complain about this problem, and attempt to suggest close 4705 // matches (e.g., those that differ only in cv-qualifiers and 4706 // whether the parameter types are references). 4707 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 4708 << Name << DC << D.getCXXScopeSpec().getRange(); 4709 NewFD->setInvalidDecl(); 4710 4711 DiagnoseInvalidRedeclaration(*this, NewFD); 4712 } 4713 4714 // Unqualified local friend declarations are required to resolve 4715 // to something. 4716 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 4717 Diag(D.getIdentifierLoc(), diag::err_no_matching_local_friend); 4718 NewFD->setInvalidDecl(); 4719 DiagnoseInvalidRedeclaration(*this, NewFD); 4720 } 4721 4722 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 4723 !isFriend && !isFunctionTemplateSpecialization && 4724 !isExplicitSpecialization) { 4725 // An out-of-line member function declaration must also be a 4726 // definition (C++ [dcl.meaning]p1). 4727 // Note that this is not the case for explicit specializations of 4728 // function templates or member functions of class templates, per 4729 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 4730 // for compatibility with old SWIG code which likes to generate them. 4731 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 4732 << D.getCXXScopeSpec().getRange(); 4733 } 4734 } 4735 4736 4737 // Handle attributes. We need to have merged decls when handling attributes 4738 // (for example to check for conflicts, etc). 4739 // FIXME: This needs to happen before we merge declarations. Then, 4740 // let attribute merging cope with attribute conflicts. 4741 ProcessDeclAttributes(S, NewFD, D, 4742 /*NonInheritable=*/false, /*Inheritable=*/true); 4743 4744 // attributes declared post-definition are currently ignored 4745 // FIXME: This should happen during attribute merging 4746 if (Redeclaration && Previous.isSingleResult()) { 4747 const FunctionDecl *Def; 4748 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 4749 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 4750 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 4751 Diag(Def->getLocation(), diag::note_previous_definition); 4752 } 4753 } 4754 4755 AddKnownFunctionAttributes(NewFD); 4756 4757 if (NewFD->hasAttr<OverloadableAttr>() && 4758 !NewFD->getType()->getAs<FunctionProtoType>()) { 4759 Diag(NewFD->getLocation(), 4760 diag::err_attribute_overloadable_no_prototype) 4761 << NewFD; 4762 4763 // Turn this into a variadic function with no parameters. 4764 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 4765 FunctionProtoType::ExtProtoInfo EPI; 4766 EPI.Variadic = true; 4767 EPI.ExtInfo = FT->getExtInfo(); 4768 4769 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 4770 NewFD->setType(R); 4771 } 4772 4773 // If there's a #pragma GCC visibility in scope, and this isn't a class 4774 // member, set the visibility of this function. 4775 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4776 AddPushedVisibilityAttribute(NewFD); 4777 4778 // If this is a locally-scoped extern C function, update the 4779 // map of such names. 4780 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 4781 && !NewFD->isInvalidDecl()) 4782 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 4783 4784 // Set this FunctionDecl's range up to the right paren. 4785 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 4786 4787 if (getLangOptions().CPlusPlus) { 4788 if (FunctionTemplate) { 4789 if (NewFD->isInvalidDecl()) 4790 FunctionTemplate->setInvalidDecl(); 4791 return FunctionTemplate; 4792 } 4793 } 4794 4795 MarkUnusedFileScopedDecl(NewFD); 4796 4797 if (getLangOptions().CUDA) 4798 if (IdentifierInfo *II = NewFD->getIdentifier()) 4799 if (!NewFD->isInvalidDecl() && 4800 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 4801 if (II->isStr("cudaConfigureCall")) { 4802 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 4803 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 4804 4805 Context.setcudaConfigureCallDecl(NewFD); 4806 } 4807 } 4808 4809 return NewFD; 4810} 4811 4812/// \brief Perform semantic checking of a new function declaration. 4813/// 4814/// Performs semantic analysis of the new function declaration 4815/// NewFD. This routine performs all semantic checking that does not 4816/// require the actual declarator involved in the declaration, and is 4817/// used both for the declaration of functions as they are parsed 4818/// (called via ActOnDeclarator) and for the declaration of functions 4819/// that have been instantiated via C++ template instantiation (called 4820/// via InstantiateDecl). 4821/// 4822/// \param IsExplicitSpecialiation whether this new function declaration is 4823/// an explicit specialization of the previous declaration. 4824/// 4825/// This sets NewFD->isInvalidDecl() to true if there was an error. 4826void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 4827 LookupResult &Previous, 4828 bool IsExplicitSpecialization, 4829 bool &Redeclaration) { 4830 // If NewFD is already known erroneous, don't do any of this checking. 4831 if (NewFD->isInvalidDecl()) { 4832 // If this is a class member, mark the class invalid immediately. 4833 // This avoids some consistency errors later. 4834 if (isa<CXXMethodDecl>(NewFD)) 4835 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 4836 4837 return; 4838 } 4839 4840 if (NewFD->getResultType()->isVariablyModifiedType()) { 4841 // Functions returning a variably modified type violate C99 6.7.5.2p2 4842 // because all functions have linkage. 4843 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4844 return NewFD->setInvalidDecl(); 4845 } 4846 4847 if (NewFD->isMain()) 4848 CheckMain(NewFD); 4849 4850 // Check for a previous declaration of this name. 4851 if (Previous.empty() && NewFD->isExternC()) { 4852 // Since we did not find anything by this name and we're declaring 4853 // an extern "C" function, look for a non-visible extern "C" 4854 // declaration with the same name. 4855 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4856 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 4857 if (Pos != LocallyScopedExternalDecls.end()) 4858 Previous.addDecl(Pos->second); 4859 } 4860 4861 // Merge or overload the declaration with an existing declaration of 4862 // the same name, if appropriate. 4863 if (!Previous.empty()) { 4864 // Determine whether NewFD is an overload of PrevDecl or 4865 // a declaration that requires merging. If it's an overload, 4866 // there's no more work to do here; we'll just add the new 4867 // function to the scope. 4868 4869 NamedDecl *OldDecl = 0; 4870 if (!AllowOverloadingOfFunction(Previous, Context)) { 4871 Redeclaration = true; 4872 OldDecl = Previous.getFoundDecl(); 4873 } else { 4874 switch (CheckOverload(S, NewFD, Previous, OldDecl, 4875 /*NewIsUsingDecl*/ false)) { 4876 case Ovl_Match: 4877 Redeclaration = true; 4878 break; 4879 4880 case Ovl_NonFunction: 4881 Redeclaration = true; 4882 break; 4883 4884 case Ovl_Overload: 4885 Redeclaration = false; 4886 break; 4887 } 4888 4889 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 4890 // If a function name is overloadable in C, then every function 4891 // with that name must be marked "overloadable". 4892 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 4893 << Redeclaration << NewFD; 4894 NamedDecl *OverloadedDecl = 0; 4895 if (Redeclaration) 4896 OverloadedDecl = OldDecl; 4897 else if (!Previous.empty()) 4898 OverloadedDecl = Previous.getRepresentativeDecl(); 4899 if (OverloadedDecl) 4900 Diag(OverloadedDecl->getLocation(), 4901 diag::note_attribute_overloadable_prev_overload); 4902 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 4903 Context)); 4904 } 4905 } 4906 4907 if (Redeclaration) { 4908 // NewFD and OldDecl represent declarations that need to be 4909 // merged. 4910 if (MergeFunctionDecl(NewFD, OldDecl)) 4911 return NewFD->setInvalidDecl(); 4912 4913 Previous.clear(); 4914 Previous.addDecl(OldDecl); 4915 4916 if (FunctionTemplateDecl *OldTemplateDecl 4917 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 4918 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 4919 FunctionTemplateDecl *NewTemplateDecl 4920 = NewFD->getDescribedFunctionTemplate(); 4921 assert(NewTemplateDecl && "Template/non-template mismatch"); 4922 if (CXXMethodDecl *Method 4923 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 4924 Method->setAccess(OldTemplateDecl->getAccess()); 4925 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 4926 } 4927 4928 // If this is an explicit specialization of a member that is a function 4929 // template, mark it as a member specialization. 4930 if (IsExplicitSpecialization && 4931 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 4932 NewTemplateDecl->setMemberSpecialization(); 4933 assert(OldTemplateDecl->isMemberSpecialization()); 4934 } 4935 } else { 4936 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 4937 NewFD->setAccess(OldDecl->getAccess()); 4938 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 4939 } 4940 } 4941 } 4942 4943 // Semantic checking for this function declaration (in isolation). 4944 if (getLangOptions().CPlusPlus) { 4945 // C++-specific checks. 4946 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 4947 CheckConstructor(Constructor); 4948 } else if (CXXDestructorDecl *Destructor = 4949 dyn_cast<CXXDestructorDecl>(NewFD)) { 4950 CXXRecordDecl *Record = Destructor->getParent(); 4951 QualType ClassType = Context.getTypeDeclType(Record); 4952 4953 // FIXME: Shouldn't we be able to perform this check even when the class 4954 // type is dependent? Both gcc and edg can handle that. 4955 if (!ClassType->isDependentType()) { 4956 DeclarationName Name 4957 = Context.DeclarationNames.getCXXDestructorName( 4958 Context.getCanonicalType(ClassType)); 4959 if (NewFD->getDeclName() != Name) { 4960 Diag(NewFD->getLocation(), diag::err_destructor_name); 4961 return NewFD->setInvalidDecl(); 4962 } 4963 } 4964 } else if (CXXConversionDecl *Conversion 4965 = dyn_cast<CXXConversionDecl>(NewFD)) { 4966 ActOnConversionDeclarator(Conversion); 4967 } 4968 4969 // Find any virtual functions that this function overrides. 4970 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 4971 if (!Method->isFunctionTemplateSpecialization() && 4972 !Method->getDescribedFunctionTemplate()) { 4973 if (AddOverriddenMethods(Method->getParent(), Method)) { 4974 // If the function was marked as "static", we have a problem. 4975 if (NewFD->getStorageClass() == SC_Static) { 4976 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 4977 << NewFD->getDeclName(); 4978 for (CXXMethodDecl::method_iterator 4979 Overridden = Method->begin_overridden_methods(), 4980 OverriddenEnd = Method->end_overridden_methods(); 4981 Overridden != OverriddenEnd; 4982 ++Overridden) { 4983 Diag((*Overridden)->getLocation(), 4984 diag::note_overridden_virtual_function); 4985 } 4986 } 4987 } 4988 } 4989 } 4990 4991 // Extra checking for C++ overloaded operators (C++ [over.oper]). 4992 if (NewFD->isOverloadedOperator() && 4993 CheckOverloadedOperatorDeclaration(NewFD)) 4994 return NewFD->setInvalidDecl(); 4995 4996 // Extra checking for C++0x literal operators (C++0x [over.literal]). 4997 if (NewFD->getLiteralIdentifier() && 4998 CheckLiteralOperatorDeclaration(NewFD)) 4999 return NewFD->setInvalidDecl(); 5000 5001 // In C++, check default arguments now that we have merged decls. Unless 5002 // the lexical context is the class, because in this case this is done 5003 // during delayed parsing anyway. 5004 if (!CurContext->isRecord()) 5005 CheckCXXDefaultArguments(NewFD); 5006 5007 // If this function declares a builtin function, check the type of this 5008 // declaration against the expected type for the builtin. 5009 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5010 ASTContext::GetBuiltinTypeError Error; 5011 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5012 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5013 // The type of this function differs from the type of the builtin, 5014 // so forget about the builtin entirely. 5015 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5016 } 5017 } 5018 } 5019} 5020 5021void Sema::CheckMain(FunctionDecl* FD) { 5022 // C++ [basic.start.main]p3: A program that declares main to be inline 5023 // or static is ill-formed. 5024 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5025 // shall not appear in a declaration of main. 5026 // static main is not an error under C99, but we should warn about it. 5027 bool isInline = FD->isInlineSpecified(); 5028 bool isStatic = FD->getStorageClass() == SC_Static; 5029 if (isInline || isStatic) { 5030 unsigned diagID = diag::warn_unusual_main_decl; 5031 if (isInline || getLangOptions().CPlusPlus) 5032 diagID = diag::err_unusual_main_decl; 5033 5034 int which = isStatic + (isInline << 1) - 1; 5035 Diag(FD->getLocation(), diagID) << which; 5036 } 5037 5038 QualType T = FD->getType(); 5039 assert(T->isFunctionType() && "function decl is not of function type"); 5040 const FunctionType* FT = T->getAs<FunctionType>(); 5041 5042 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5043 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5044 FD->setInvalidDecl(true); 5045 } 5046 5047 // Treat protoless main() as nullary. 5048 if (isa<FunctionNoProtoType>(FT)) return; 5049 5050 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5051 unsigned nparams = FTP->getNumArgs(); 5052 assert(FD->getNumParams() == nparams); 5053 5054 bool HasExtraParameters = (nparams > 3); 5055 5056 // Darwin passes an undocumented fourth argument of type char**. If 5057 // other platforms start sprouting these, the logic below will start 5058 // getting shifty. 5059 if (nparams == 4 && Context.Target.getTriple().isOSDarwin()) 5060 HasExtraParameters = false; 5061 5062 if (HasExtraParameters) { 5063 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5064 FD->setInvalidDecl(true); 5065 nparams = 3; 5066 } 5067 5068 // FIXME: a lot of the following diagnostics would be improved 5069 // if we had some location information about types. 5070 5071 QualType CharPP = 5072 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5073 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5074 5075 for (unsigned i = 0; i < nparams; ++i) { 5076 QualType AT = FTP->getArgType(i); 5077 5078 bool mismatch = true; 5079 5080 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5081 mismatch = false; 5082 else if (Expected[i] == CharPP) { 5083 // As an extension, the following forms are okay: 5084 // char const ** 5085 // char const * const * 5086 // char * const * 5087 5088 QualifierCollector qs; 5089 const PointerType* PT; 5090 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5091 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5092 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5093 qs.removeConst(); 5094 mismatch = !qs.empty(); 5095 } 5096 } 5097 5098 if (mismatch) { 5099 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5100 // TODO: suggest replacing given type with expected type 5101 FD->setInvalidDecl(true); 5102 } 5103 } 5104 5105 if (nparams == 1 && !FD->isInvalidDecl()) { 5106 Diag(FD->getLocation(), diag::warn_main_one_arg); 5107 } 5108 5109 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5110 Diag(FD->getLocation(), diag::err_main_template_decl); 5111 FD->setInvalidDecl(); 5112 } 5113} 5114 5115bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5116 // FIXME: Need strict checking. In C89, we need to check for 5117 // any assignment, increment, decrement, function-calls, or 5118 // commas outside of a sizeof. In C99, it's the same list, 5119 // except that the aforementioned are allowed in unevaluated 5120 // expressions. Everything else falls under the 5121 // "may accept other forms of constant expressions" exception. 5122 // (We never end up here for C++, so the constant expression 5123 // rules there don't matter.) 5124 if (Init->isConstantInitializer(Context, false)) 5125 return false; 5126 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5127 << Init->getSourceRange(); 5128 return true; 5129} 5130 5131namespace { 5132 // Visits an initialization expression to see if OrigDecl is evaluated in 5133 // its own initialization and throws a warning if it does. 5134 class SelfReferenceChecker 5135 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5136 Sema &S; 5137 Decl *OrigDecl; 5138 5139 public: 5140 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5141 5142 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5143 S(S), OrigDecl(OrigDecl) { } 5144 5145 void VisitExpr(Expr *E) { 5146 if (isa<ObjCMessageExpr>(*E)) return; 5147 Inherited::VisitExpr(E); 5148 } 5149 5150 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5151 CheckForSelfReference(E); 5152 Inherited::VisitImplicitCastExpr(E); 5153 } 5154 5155 void CheckForSelfReference(ImplicitCastExpr *E) { 5156 if (E->getCastKind() != CK_LValueToRValue) return; 5157 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5158 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr); 5159 if (!DRE) return; 5160 Decl* ReferenceDecl = DRE->getDecl(); 5161 if (OrigDecl != ReferenceDecl) return; 5162 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5163 Sema::NotForRedeclaration); 5164 S.DiagRuntimeBehavior(SubExpr->getLocStart(), SubExpr, 5165 S.PDiag(diag::warn_uninit_self_reference_in_init) 5166 << Result.getLookupName() 5167 << OrigDecl->getLocation() 5168 << SubExpr->getSourceRange()); 5169 } 5170 }; 5171} 5172 5173/// AddInitializerToDecl - Adds the initializer Init to the 5174/// declaration dcl. If DirectInit is true, this is C++ direct 5175/// initialization rather than copy initialization. 5176void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5177 bool DirectInit, bool TypeMayContainAuto) { 5178 // If there is no declaration, there was an error parsing it. Just ignore 5179 // the initializer. 5180 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5181 return; 5182 5183 // Check for self-references within variable initializers. 5184 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5185 // Variables declared within a function/method body are handled 5186 // by a dataflow analysis. 5187 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5188 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5189 } 5190 else { 5191 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5192 } 5193 5194 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5195 // With declarators parsed the way they are, the parser cannot 5196 // distinguish between a normal initializer and a pure-specifier. 5197 // Thus this grotesque test. 5198 IntegerLiteral *IL; 5199 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5200 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5201 CheckPureMethod(Method, Init->getSourceRange()); 5202 else { 5203 Diag(Method->getLocation(), diag::err_member_function_initialization) 5204 << Method->getDeclName() << Init->getSourceRange(); 5205 Method->setInvalidDecl(); 5206 } 5207 return; 5208 } 5209 5210 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5211 if (!VDecl) { 5212 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5213 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5214 RealDecl->setInvalidDecl(); 5215 return; 5216 } 5217 5218 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5219 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5220 TypeSourceInfo *DeducedType = 0; 5221 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5222 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5223 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5224 << Init->getSourceRange(); 5225 if (!DeducedType) { 5226 RealDecl->setInvalidDecl(); 5227 return; 5228 } 5229 VDecl->setTypeSourceInfo(DeducedType); 5230 VDecl->setType(DeducedType->getType()); 5231 5232 // If this is a redeclaration, check that the type we just deduced matches 5233 // the previously declared type. 5234 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5235 MergeVarDeclTypes(VDecl, Old); 5236 } 5237 5238 5239 // A definition must end up with a complete type, which means it must be 5240 // complete with the restriction that an array type might be completed by the 5241 // initializer; note that later code assumes this restriction. 5242 QualType BaseDeclType = VDecl->getType(); 5243 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5244 BaseDeclType = Array->getElementType(); 5245 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5246 diag::err_typecheck_decl_incomplete_type)) { 5247 RealDecl->setInvalidDecl(); 5248 return; 5249 } 5250 5251 // The variable can not have an abstract class type. 5252 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5253 diag::err_abstract_type_in_decl, 5254 AbstractVariableType)) 5255 VDecl->setInvalidDecl(); 5256 5257 const VarDecl *Def; 5258 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5259 Diag(VDecl->getLocation(), diag::err_redefinition) 5260 << VDecl->getDeclName(); 5261 Diag(Def->getLocation(), diag::note_previous_definition); 5262 VDecl->setInvalidDecl(); 5263 return; 5264 } 5265 5266 const VarDecl* PrevInit = 0; 5267 if (getLangOptions().CPlusPlus) { 5268 // C++ [class.static.data]p4 5269 // If a static data member is of const integral or const 5270 // enumeration type, its declaration in the class definition can 5271 // specify a constant-initializer which shall be an integral 5272 // constant expression (5.19). In that case, the member can appear 5273 // in integral constant expressions. The member shall still be 5274 // defined in a namespace scope if it is used in the program and the 5275 // namespace scope definition shall not contain an initializer. 5276 // 5277 // We already performed a redefinition check above, but for static 5278 // data members we also need to check whether there was an in-class 5279 // declaration with an initializer. 5280 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5281 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5282 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5283 return; 5284 } 5285 5286 if (VDecl->hasLocalStorage()) 5287 getCurFunction()->setHasBranchProtectedScope(); 5288 5289 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5290 VDecl->setInvalidDecl(); 5291 return; 5292 } 5293 } 5294 5295 // Capture the variable that is being initialized and the style of 5296 // initialization. 5297 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5298 5299 // FIXME: Poor source location information. 5300 InitializationKind Kind 5301 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5302 Init->getLocStart(), 5303 Init->getLocEnd()) 5304 : InitializationKind::CreateCopy(VDecl->getLocation(), 5305 Init->getLocStart()); 5306 5307 // Get the decls type and save a reference for later, since 5308 // CheckInitializerTypes may change it. 5309 QualType DclT = VDecl->getType(), SavT = DclT; 5310 if (VDecl->isLocalVarDecl()) { 5311 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5312 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5313 VDecl->setInvalidDecl(); 5314 } else if (!VDecl->isInvalidDecl()) { 5315 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5316 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5317 MultiExprArg(*this, &Init, 1), 5318 &DclT); 5319 if (Result.isInvalid()) { 5320 VDecl->setInvalidDecl(); 5321 return; 5322 } 5323 5324 Init = Result.takeAs<Expr>(); 5325 5326 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5327 // Don't check invalid declarations to avoid emitting useless diagnostics. 5328 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5329 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5330 CheckForConstantInitializer(Init, DclT); 5331 } 5332 } 5333 } else if (VDecl->isStaticDataMember() && 5334 VDecl->getLexicalDeclContext()->isRecord()) { 5335 // This is an in-class initialization for a static data member, e.g., 5336 // 5337 // struct S { 5338 // static const int value = 17; 5339 // }; 5340 5341 // Try to perform the initialization regardless. 5342 if (!VDecl->isInvalidDecl()) { 5343 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5344 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5345 MultiExprArg(*this, &Init, 1), 5346 &DclT); 5347 if (Result.isInvalid()) { 5348 VDecl->setInvalidDecl(); 5349 return; 5350 } 5351 5352 Init = Result.takeAs<Expr>(); 5353 } 5354 5355 // C++ [class.mem]p4: 5356 // A member-declarator can contain a constant-initializer only 5357 // if it declares a static member (9.4) of const integral or 5358 // const enumeration type, see 9.4.2. 5359 QualType T = VDecl->getType(); 5360 5361 // Do nothing on dependent types. 5362 if (T->isDependentType()) { 5363 5364 // Require constness. 5365 } else if (!T.isConstQualified()) { 5366 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5367 << Init->getSourceRange(); 5368 VDecl->setInvalidDecl(); 5369 5370 // We allow integer constant expressions in all cases. 5371 } else if (T->isIntegralOrEnumerationType()) { 5372 // Check whether the expression is a constant expression. 5373 SourceLocation Loc; 5374 if (Init->isValueDependent()) 5375 ; // Nothing to check. 5376 else if (Init->isIntegerConstantExpr(Context, &Loc)) 5377 ; // Ok, it's an ICE! 5378 else if (Init->isEvaluatable(Context)) { 5379 // If we can constant fold the initializer through heroics, accept it, 5380 // but report this as a use of an extension for -pedantic. 5381 Diag(Loc, diag::ext_in_class_initializer_non_constant) 5382 << Init->getSourceRange(); 5383 } else { 5384 // Otherwise, this is some crazy unknown case. Report the issue at the 5385 // location provided by the isIntegerConstantExpr failed check. 5386 Diag(Loc, diag::err_in_class_initializer_non_constant) 5387 << Init->getSourceRange(); 5388 VDecl->setInvalidDecl(); 5389 } 5390 5391 // We allow floating-point constants as an extension in C++03, and 5392 // C++0x has far more complicated rules that we don't really 5393 // implement fully. 5394 } else { 5395 bool Allowed = false; 5396 if (getLangOptions().CPlusPlus0x) { 5397 Allowed = T->isLiteralType(); 5398 } else if (T->isFloatingType()) { // also permits complex, which is ok 5399 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5400 << T << Init->getSourceRange(); 5401 Allowed = true; 5402 } 5403 5404 if (!Allowed) { 5405 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5406 << T << Init->getSourceRange(); 5407 VDecl->setInvalidDecl(); 5408 5409 // TODO: there are probably expressions that pass here that shouldn't. 5410 } else if (!Init->isValueDependent() && 5411 !Init->isConstantInitializer(Context, false)) { 5412 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5413 << Init->getSourceRange(); 5414 VDecl->setInvalidDecl(); 5415 } 5416 } 5417 } else if (VDecl->isFileVarDecl()) { 5418 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5419 (!getLangOptions().CPlusPlus || 5420 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5421 Diag(VDecl->getLocation(), diag::warn_extern_init); 5422 if (!VDecl->isInvalidDecl()) { 5423 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5424 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5425 MultiExprArg(*this, &Init, 1), 5426 &DclT); 5427 if (Result.isInvalid()) { 5428 VDecl->setInvalidDecl(); 5429 return; 5430 } 5431 5432 Init = Result.takeAs<Expr>(); 5433 } 5434 5435 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5436 // Don't check invalid declarations to avoid emitting useless diagnostics. 5437 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5438 // C99 6.7.8p4. All file scoped initializers need to be constant. 5439 CheckForConstantInitializer(Init, DclT); 5440 } 5441 } 5442 // If the type changed, it means we had an incomplete type that was 5443 // completed by the initializer. For example: 5444 // int ary[] = { 1, 3, 5 }; 5445 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5446 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5447 VDecl->setType(DclT); 5448 Init->setType(DclT); 5449 } 5450 5451 5452 // If this variable is a local declaration with record type, make sure it 5453 // doesn't have a flexible member initialization. We only support this as a 5454 // global/static definition. 5455 if (VDecl->hasLocalStorage()) 5456 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 5457 if (RT->getDecl()->hasFlexibleArrayMember()) { 5458 // Check whether the initializer tries to initialize the flexible 5459 // array member itself to anything other than an empty initializer list. 5460 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) { 5461 unsigned Index = std::distance(RT->getDecl()->field_begin(), 5462 RT->getDecl()->field_end()) - 1; 5463 if (Index < ILE->getNumInits() && 5464 !(isa<InitListExpr>(ILE->getInit(Index)) && 5465 cast<InitListExpr>(ILE->getInit(Index))->getNumInits() == 0)) { 5466 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 5467 VDecl->setInvalidDecl(); 5468 } 5469 } 5470 } 5471 5472 // Check any implicit conversions within the expression. 5473 CheckImplicitConversions(Init, VDecl->getLocation()); 5474 5475 Init = MaybeCreateExprWithCleanups(Init); 5476 // Attach the initializer to the decl. 5477 VDecl->setInit(Init); 5478 5479 CheckCompleteVariableDeclaration(VDecl); 5480} 5481 5482/// ActOnInitializerError - Given that there was an error parsing an 5483/// initializer for the given declaration, try to return to some form 5484/// of sanity. 5485void Sema::ActOnInitializerError(Decl *D) { 5486 // Our main concern here is re-establishing invariants like "a 5487 // variable's type is either dependent or complete". 5488 if (!D || D->isInvalidDecl()) return; 5489 5490 VarDecl *VD = dyn_cast<VarDecl>(D); 5491 if (!VD) return; 5492 5493 // Auto types are meaningless if we can't make sense of the initializer. 5494 if (ParsingInitForAutoVars.count(D)) { 5495 D->setInvalidDecl(); 5496 return; 5497 } 5498 5499 QualType Ty = VD->getType(); 5500 if (Ty->isDependentType()) return; 5501 5502 // Require a complete type. 5503 if (RequireCompleteType(VD->getLocation(), 5504 Context.getBaseElementType(Ty), 5505 diag::err_typecheck_decl_incomplete_type)) { 5506 VD->setInvalidDecl(); 5507 return; 5508 } 5509 5510 // Require an abstract type. 5511 if (RequireNonAbstractType(VD->getLocation(), Ty, 5512 diag::err_abstract_type_in_decl, 5513 AbstractVariableType)) { 5514 VD->setInvalidDecl(); 5515 return; 5516 } 5517 5518 // Don't bother complaining about constructors or destructors, 5519 // though. 5520} 5521 5522void Sema::ActOnUninitializedDecl(Decl *RealDecl, 5523 bool TypeMayContainAuto) { 5524 // If there is no declaration, there was an error parsing it. Just ignore it. 5525 if (RealDecl == 0) 5526 return; 5527 5528 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 5529 QualType Type = Var->getType(); 5530 5531 // C++0x [dcl.spec.auto]p3 5532 if (TypeMayContainAuto && Type->getContainedAutoType()) { 5533 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 5534 << Var->getDeclName() << Type; 5535 Var->setInvalidDecl(); 5536 return; 5537 } 5538 5539 switch (Var->isThisDeclarationADefinition()) { 5540 case VarDecl::Definition: 5541 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 5542 break; 5543 5544 // We have an out-of-line definition of a static data member 5545 // that has an in-class initializer, so we type-check this like 5546 // a declaration. 5547 // 5548 // Fall through 5549 5550 case VarDecl::DeclarationOnly: 5551 // It's only a declaration. 5552 5553 // Block scope. C99 6.7p7: If an identifier for an object is 5554 // declared with no linkage (C99 6.2.2p6), the type for the 5555 // object shall be complete. 5556 if (!Type->isDependentType() && Var->isLocalVarDecl() && 5557 !Var->getLinkage() && !Var->isInvalidDecl() && 5558 RequireCompleteType(Var->getLocation(), Type, 5559 diag::err_typecheck_decl_incomplete_type)) 5560 Var->setInvalidDecl(); 5561 5562 // Make sure that the type is not abstract. 5563 if (!Type->isDependentType() && !Var->isInvalidDecl() && 5564 RequireNonAbstractType(Var->getLocation(), Type, 5565 diag::err_abstract_type_in_decl, 5566 AbstractVariableType)) 5567 Var->setInvalidDecl(); 5568 return; 5569 5570 case VarDecl::TentativeDefinition: 5571 // File scope. C99 6.9.2p2: A declaration of an identifier for an 5572 // object that has file scope without an initializer, and without a 5573 // storage-class specifier or with the storage-class specifier "static", 5574 // constitutes a tentative definition. Note: A tentative definition with 5575 // external linkage is valid (C99 6.2.2p5). 5576 if (!Var->isInvalidDecl()) { 5577 if (const IncompleteArrayType *ArrayT 5578 = Context.getAsIncompleteArrayType(Type)) { 5579 if (RequireCompleteType(Var->getLocation(), 5580 ArrayT->getElementType(), 5581 diag::err_illegal_decl_array_incomplete_type)) 5582 Var->setInvalidDecl(); 5583 } else if (Var->getStorageClass() == SC_Static) { 5584 // C99 6.9.2p3: If the declaration of an identifier for an object is 5585 // a tentative definition and has internal linkage (C99 6.2.2p3), the 5586 // declared type shall not be an incomplete type. 5587 // NOTE: code such as the following 5588 // static struct s; 5589 // struct s { int a; }; 5590 // is accepted by gcc. Hence here we issue a warning instead of 5591 // an error and we do not invalidate the static declaration. 5592 // NOTE: to avoid multiple warnings, only check the first declaration. 5593 if (Var->getPreviousDeclaration() == 0) 5594 RequireCompleteType(Var->getLocation(), Type, 5595 diag::ext_typecheck_decl_incomplete_type); 5596 } 5597 } 5598 5599 // Record the tentative definition; we're done. 5600 if (!Var->isInvalidDecl()) 5601 TentativeDefinitions.push_back(Var); 5602 return; 5603 } 5604 5605 // Provide a specific diagnostic for uninitialized variable 5606 // definitions with incomplete array type. 5607 if (Type->isIncompleteArrayType()) { 5608 Diag(Var->getLocation(), 5609 diag::err_typecheck_incomplete_array_needs_initializer); 5610 Var->setInvalidDecl(); 5611 return; 5612 } 5613 5614 // Provide a specific diagnostic for uninitialized variable 5615 // definitions with reference type. 5616 if (Type->isReferenceType()) { 5617 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 5618 << Var->getDeclName() 5619 << SourceRange(Var->getLocation(), Var->getLocation()); 5620 Var->setInvalidDecl(); 5621 return; 5622 } 5623 5624 // Do not attempt to type-check the default initializer for a 5625 // variable with dependent type. 5626 if (Type->isDependentType()) 5627 return; 5628 5629 if (Var->isInvalidDecl()) 5630 return; 5631 5632 if (RequireCompleteType(Var->getLocation(), 5633 Context.getBaseElementType(Type), 5634 diag::err_typecheck_decl_incomplete_type)) { 5635 Var->setInvalidDecl(); 5636 return; 5637 } 5638 5639 // The variable can not have an abstract class type. 5640 if (RequireNonAbstractType(Var->getLocation(), Type, 5641 diag::err_abstract_type_in_decl, 5642 AbstractVariableType)) { 5643 Var->setInvalidDecl(); 5644 return; 5645 } 5646 5647 // Check for jumps past the implicit initializer. C++0x 5648 // clarifies that this applies to a "variable with automatic 5649 // storage duration", not a "local variable". 5650 // C++0x [stmt.dcl]p3 5651 // A program that jumps from a point where a variable with automatic 5652 // storage duration is not in scope to a point where it is in scope is 5653 // ill-formed unless the variable has scalar type, class type with a 5654 // trivial default constructor and a trivial destructor, a cv-qualified 5655 // version of one of these types, or an array of one of the preceding 5656 // types and is declared without an initializer. 5657 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 5658 if (const RecordType *Record 5659 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 5660 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 5661 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 5662 (getLangOptions().CPlusPlus0x && 5663 (!CXXRecord->hasTrivialDefaultConstructor() || 5664 !CXXRecord->hasTrivialDestructor()))) 5665 getCurFunction()->setHasBranchProtectedScope(); 5666 } 5667 } 5668 5669 // C++03 [dcl.init]p9: 5670 // If no initializer is specified for an object, and the 5671 // object is of (possibly cv-qualified) non-POD class type (or 5672 // array thereof), the object shall be default-initialized; if 5673 // the object is of const-qualified type, the underlying class 5674 // type shall have a user-declared default 5675 // constructor. Otherwise, if no initializer is specified for 5676 // a non- static object, the object and its subobjects, if 5677 // any, have an indeterminate initial value); if the object 5678 // or any of its subobjects are of const-qualified type, the 5679 // program is ill-formed. 5680 // C++0x [dcl.init]p11: 5681 // If no initializer is specified for an object, the object is 5682 // default-initialized; [...]. 5683 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 5684 InitializationKind Kind 5685 = InitializationKind::CreateDefault(Var->getLocation()); 5686 5687 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 5688 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 5689 MultiExprArg(*this, 0, 0)); 5690 if (Init.isInvalid()) 5691 Var->setInvalidDecl(); 5692 else if (Init.get()) 5693 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 5694 5695 CheckCompleteVariableDeclaration(Var); 5696 } 5697} 5698 5699void Sema::ActOnCXXForRangeDecl(Decl *D) { 5700 VarDecl *VD = dyn_cast<VarDecl>(D); 5701 if (!VD) { 5702 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 5703 D->setInvalidDecl(); 5704 return; 5705 } 5706 5707 VD->setCXXForRangeDecl(true); 5708 5709 // for-range-declaration cannot be given a storage class specifier. 5710 int Error = -1; 5711 switch (VD->getStorageClassAsWritten()) { 5712 case SC_None: 5713 break; 5714 case SC_Extern: 5715 Error = 0; 5716 break; 5717 case SC_Static: 5718 Error = 1; 5719 break; 5720 case SC_PrivateExtern: 5721 Error = 2; 5722 break; 5723 case SC_Auto: 5724 Error = 3; 5725 break; 5726 case SC_Register: 5727 Error = 4; 5728 break; 5729 } 5730 // FIXME: constexpr isn't allowed here. 5731 //if (DS.isConstexprSpecified()) 5732 // Error = 5; 5733 if (Error != -1) { 5734 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 5735 << VD->getDeclName() << Error; 5736 D->setInvalidDecl(); 5737 } 5738} 5739 5740void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 5741 if (var->isInvalidDecl()) return; 5742 5743 // All the following checks are C++ only. 5744 if (!getLangOptions().CPlusPlus) return; 5745 5746 QualType baseType = Context.getBaseElementType(var->getType()); 5747 if (baseType->isDependentType()) return; 5748 5749 // __block variables might require us to capture a copy-initializer. 5750 if (var->hasAttr<BlocksAttr>()) { 5751 // It's currently invalid to ever have a __block variable with an 5752 // array type; should we diagnose that here? 5753 5754 // Regardless, we don't want to ignore array nesting when 5755 // constructing this copy. 5756 QualType type = var->getType(); 5757 5758 if (type->isStructureOrClassType()) { 5759 SourceLocation poi = var->getLocation(); 5760 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 5761 ExprResult result = 5762 PerformCopyInitialization( 5763 InitializedEntity::InitializeBlock(poi, type, false), 5764 poi, Owned(varRef)); 5765 if (!result.isInvalid()) { 5766 result = MaybeCreateExprWithCleanups(result); 5767 Expr *init = result.takeAs<Expr>(); 5768 Context.setBlockVarCopyInits(var, init); 5769 } 5770 } 5771 } 5772 5773 // Check for global constructors. 5774 if (!var->getDeclContext()->isDependentContext() && 5775 var->hasGlobalStorage() && 5776 !var->isStaticLocal() && 5777 var->getInit() && 5778 !var->getInit()->isConstantInitializer(Context, 5779 baseType->isReferenceType())) 5780 Diag(var->getLocation(), diag::warn_global_constructor) 5781 << var->getInit()->getSourceRange(); 5782 5783 // Require the destructor. 5784 if (const RecordType *recordType = baseType->getAs<RecordType>()) 5785 FinalizeVarWithDestructor(var, recordType); 5786} 5787 5788/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 5789/// any semantic actions necessary after any initializer has been attached. 5790void 5791Sema::FinalizeDeclaration(Decl *ThisDecl) { 5792 // Note that we are no longer parsing the initializer for this declaration. 5793 ParsingInitForAutoVars.erase(ThisDecl); 5794} 5795 5796Sema::DeclGroupPtrTy 5797Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 5798 Decl **Group, unsigned NumDecls) { 5799 llvm::SmallVector<Decl*, 8> Decls; 5800 5801 if (DS.isTypeSpecOwned()) 5802 Decls.push_back(DS.getRepAsDecl()); 5803 5804 for (unsigned i = 0; i != NumDecls; ++i) 5805 if (Decl *D = Group[i]) 5806 Decls.push_back(D); 5807 5808 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 5809 DS.getTypeSpecType() == DeclSpec::TST_auto); 5810} 5811 5812/// BuildDeclaratorGroup - convert a list of declarations into a declaration 5813/// group, performing any necessary semantic checking. 5814Sema::DeclGroupPtrTy 5815Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 5816 bool TypeMayContainAuto) { 5817 // C++0x [dcl.spec.auto]p7: 5818 // If the type deduced for the template parameter U is not the same in each 5819 // deduction, the program is ill-formed. 5820 // FIXME: When initializer-list support is added, a distinction is needed 5821 // between the deduced type U and the deduced type which 'auto' stands for. 5822 // auto a = 0, b = { 1, 2, 3 }; 5823 // is legal because the deduced type U is 'int' in both cases. 5824 if (TypeMayContainAuto && NumDecls > 1) { 5825 QualType Deduced; 5826 CanQualType DeducedCanon; 5827 VarDecl *DeducedDecl = 0; 5828 for (unsigned i = 0; i != NumDecls; ++i) { 5829 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 5830 AutoType *AT = D->getType()->getContainedAutoType(); 5831 // Don't reissue diagnostics when instantiating a template. 5832 if (AT && D->isInvalidDecl()) 5833 break; 5834 if (AT && AT->isDeduced()) { 5835 QualType U = AT->getDeducedType(); 5836 CanQualType UCanon = Context.getCanonicalType(U); 5837 if (Deduced.isNull()) { 5838 Deduced = U; 5839 DeducedCanon = UCanon; 5840 DeducedDecl = D; 5841 } else if (DeducedCanon != UCanon) { 5842 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 5843 diag::err_auto_different_deductions) 5844 << Deduced << DeducedDecl->getDeclName() 5845 << U << D->getDeclName() 5846 << DeducedDecl->getInit()->getSourceRange() 5847 << D->getInit()->getSourceRange(); 5848 D->setInvalidDecl(); 5849 break; 5850 } 5851 } 5852 } 5853 } 5854 } 5855 5856 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 5857} 5858 5859 5860/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 5861/// to introduce parameters into function prototype scope. 5862Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 5863 const DeclSpec &DS = D.getDeclSpec(); 5864 5865 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 5866 VarDecl::StorageClass StorageClass = SC_None; 5867 VarDecl::StorageClass StorageClassAsWritten = SC_None; 5868 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 5869 StorageClass = SC_Register; 5870 StorageClassAsWritten = SC_Register; 5871 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 5872 Diag(DS.getStorageClassSpecLoc(), 5873 diag::err_invalid_storage_class_in_func_decl); 5874 D.getMutableDeclSpec().ClearStorageClassSpecs(); 5875 } 5876 5877 if (D.getDeclSpec().isThreadSpecified()) 5878 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5879 5880 DiagnoseFunctionSpecifiers(D); 5881 5882 TagDecl *OwnedDecl = 0; 5883 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 5884 QualType parmDeclType = TInfo->getType(); 5885 5886 if (getLangOptions().CPlusPlus) { 5887 // Check that there are no default arguments inside the type of this 5888 // parameter. 5889 CheckExtraCXXDefaultArguments(D); 5890 5891 if (OwnedDecl && OwnedDecl->isDefinition()) { 5892 // C++ [dcl.fct]p6: 5893 // Types shall not be defined in return or parameter types. 5894 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 5895 << Context.getTypeDeclType(OwnedDecl); 5896 } 5897 5898 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 5899 if (D.getCXXScopeSpec().isSet()) { 5900 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 5901 << D.getCXXScopeSpec().getRange(); 5902 D.getCXXScopeSpec().clear(); 5903 } 5904 } 5905 5906 // Ensure we have a valid name 5907 IdentifierInfo *II = 0; 5908 if (D.hasName()) { 5909 II = D.getIdentifier(); 5910 if (!II) { 5911 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 5912 << GetNameForDeclarator(D).getName().getAsString(); 5913 D.setInvalidType(true); 5914 } 5915 } 5916 5917 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 5918 if (II) { 5919 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 5920 ForRedeclaration); 5921 LookupName(R, S); 5922 if (R.isSingleResult()) { 5923 NamedDecl *PrevDecl = R.getFoundDecl(); 5924 if (PrevDecl->isTemplateParameter()) { 5925 // Maybe we will complain about the shadowed template parameter. 5926 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5927 // Just pretend that we didn't see the previous declaration. 5928 PrevDecl = 0; 5929 } else if (S->isDeclScope(PrevDecl)) { 5930 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 5931 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5932 5933 // Recover by removing the name 5934 II = 0; 5935 D.SetIdentifier(0, D.getIdentifierLoc()); 5936 D.setInvalidType(true); 5937 } 5938 } 5939 } 5940 5941 // Temporarily put parameter variables in the translation unit, not 5942 // the enclosing context. This prevents them from accidentally 5943 // looking like class members in C++. 5944 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 5945 D.getSourceRange().getBegin(), 5946 D.getIdentifierLoc(), II, 5947 parmDeclType, TInfo, 5948 StorageClass, StorageClassAsWritten); 5949 5950 if (D.isInvalidType()) 5951 New->setInvalidDecl(); 5952 5953 assert(S->isFunctionPrototypeScope()); 5954 assert(S->getFunctionPrototypeDepth() >= 1); 5955 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 5956 S->getNextFunctionPrototypeIndex()); 5957 5958 // Add the parameter declaration into this scope. 5959 S->AddDecl(New); 5960 if (II) 5961 IdResolver.AddDecl(New); 5962 5963 ProcessDeclAttributes(S, New, D); 5964 5965 if (New->hasAttr<BlocksAttr>()) { 5966 Diag(New->getLocation(), diag::err_block_on_nonlocal); 5967 } 5968 return New; 5969} 5970 5971/// \brief Synthesizes a variable for a parameter arising from a 5972/// typedef. 5973ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 5974 SourceLocation Loc, 5975 QualType T) { 5976 /* FIXME: setting StartLoc == Loc. 5977 Would it be worth to modify callers so as to provide proper source 5978 location for the unnamed parameters, embedding the parameter's type? */ 5979 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 5980 T, Context.getTrivialTypeSourceInfo(T, Loc), 5981 SC_None, SC_None, 0); 5982 Param->setImplicit(); 5983 return Param; 5984} 5985 5986void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 5987 ParmVarDecl * const *ParamEnd) { 5988 // Don't diagnose unused-parameter errors in template instantiations; we 5989 // will already have done so in the template itself. 5990 if (!ActiveTemplateInstantiations.empty()) 5991 return; 5992 5993 for (; Param != ParamEnd; ++Param) { 5994 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 5995 !(*Param)->hasAttr<UnusedAttr>()) { 5996 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 5997 << (*Param)->getDeclName(); 5998 } 5999 } 6000} 6001 6002void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6003 ParmVarDecl * const *ParamEnd, 6004 QualType ReturnTy, 6005 NamedDecl *D) { 6006 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6007 return; 6008 6009 // Warn if the return value is pass-by-value and larger than the specified 6010 // threshold. 6011 if (ReturnTy->isPODType()) { 6012 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6013 if (Size > LangOpts.NumLargeByValueCopy) 6014 Diag(D->getLocation(), diag::warn_return_value_size) 6015 << D->getDeclName() << Size; 6016 } 6017 6018 // Warn if any parameter is pass-by-value and larger than the specified 6019 // threshold. 6020 for (; Param != ParamEnd; ++Param) { 6021 QualType T = (*Param)->getType(); 6022 if (!T->isPODType()) 6023 continue; 6024 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6025 if (Size > LangOpts.NumLargeByValueCopy) 6026 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6027 << (*Param)->getDeclName() << Size; 6028 } 6029} 6030 6031ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6032 SourceLocation NameLoc, IdentifierInfo *Name, 6033 QualType T, TypeSourceInfo *TSInfo, 6034 VarDecl::StorageClass StorageClass, 6035 VarDecl::StorageClass StorageClassAsWritten) { 6036 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6037 adjustParameterType(T), TSInfo, 6038 StorageClass, StorageClassAsWritten, 6039 0); 6040 6041 // Parameters can not be abstract class types. 6042 // For record types, this is done by the AbstractClassUsageDiagnoser once 6043 // the class has been completely parsed. 6044 if (!CurContext->isRecord() && 6045 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6046 AbstractParamType)) 6047 New->setInvalidDecl(); 6048 6049 // Parameter declarators cannot be interface types. All ObjC objects are 6050 // passed by reference. 6051 if (T->isObjCObjectType()) { 6052 Diag(NameLoc, 6053 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 6054 New->setInvalidDecl(); 6055 } 6056 6057 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6058 // duration shall not be qualified by an address-space qualifier." 6059 // Since all parameters have automatic store duration, they can not have 6060 // an address space. 6061 if (T.getAddressSpace() != 0) { 6062 Diag(NameLoc, diag::err_arg_with_address_space); 6063 New->setInvalidDecl(); 6064 } 6065 6066 return New; 6067} 6068 6069void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6070 SourceLocation LocAfterDecls) { 6071 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6072 6073 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6074 // for a K&R function. 6075 if (!FTI.hasPrototype) { 6076 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6077 --i; 6078 if (FTI.ArgInfo[i].Param == 0) { 6079 llvm::SmallString<256> Code; 6080 llvm::raw_svector_ostream(Code) << " int " 6081 << FTI.ArgInfo[i].Ident->getName() 6082 << ";\n"; 6083 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6084 << FTI.ArgInfo[i].Ident 6085 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6086 6087 // Implicitly declare the argument as type 'int' for lack of a better 6088 // type. 6089 AttributeFactory attrs; 6090 DeclSpec DS(attrs); 6091 const char* PrevSpec; // unused 6092 unsigned DiagID; // unused 6093 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6094 PrevSpec, DiagID); 6095 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6096 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6097 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6098 } 6099 } 6100 } 6101} 6102 6103Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6104 Declarator &D) { 6105 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6106 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6107 Scope *ParentScope = FnBodyScope->getParent(); 6108 6109 Decl *DP = HandleDeclarator(ParentScope, D, 6110 MultiTemplateParamsArg(*this), 6111 /*IsFunctionDefinition=*/true); 6112 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6113} 6114 6115static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6116 // Don't warn about invalid declarations. 6117 if (FD->isInvalidDecl()) 6118 return false; 6119 6120 // Or declarations that aren't global. 6121 if (!FD->isGlobal()) 6122 return false; 6123 6124 // Don't warn about C++ member functions. 6125 if (isa<CXXMethodDecl>(FD)) 6126 return false; 6127 6128 // Don't warn about 'main'. 6129 if (FD->isMain()) 6130 return false; 6131 6132 // Don't warn about inline functions. 6133 if (FD->isInlined()) 6134 return false; 6135 6136 // Don't warn about function templates. 6137 if (FD->getDescribedFunctionTemplate()) 6138 return false; 6139 6140 // Don't warn about function template specializations. 6141 if (FD->isFunctionTemplateSpecialization()) 6142 return false; 6143 6144 bool MissingPrototype = true; 6145 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6146 Prev; Prev = Prev->getPreviousDeclaration()) { 6147 // Ignore any declarations that occur in function or method 6148 // scope, because they aren't visible from the header. 6149 if (Prev->getDeclContext()->isFunctionOrMethod()) 6150 continue; 6151 6152 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6153 break; 6154 } 6155 6156 return MissingPrototype; 6157} 6158 6159void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6160 // Don't complain if we're in GNU89 mode and the previous definition 6161 // was an extern inline function. 6162 const FunctionDecl *Definition; 6163 if (FD->isDefined(Definition) && 6164 !canRedefineFunction(Definition, getLangOptions())) { 6165 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6166 Definition->getStorageClass() == SC_Extern) 6167 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6168 << FD->getDeclName() << getLangOptions().CPlusPlus; 6169 else 6170 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6171 Diag(Definition->getLocation(), diag::note_previous_definition); 6172 } 6173} 6174 6175Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6176 // Clear the last template instantiation error context. 6177 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6178 6179 if (!D) 6180 return D; 6181 FunctionDecl *FD = 0; 6182 6183 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6184 FD = FunTmpl->getTemplatedDecl(); 6185 else 6186 FD = cast<FunctionDecl>(D); 6187 6188 // Enter a new function scope 6189 PushFunctionScope(); 6190 6191 // See if this is a redefinition. 6192 if (!FD->isLateTemplateParsed()) 6193 CheckForFunctionRedefinition(FD); 6194 6195 // Builtin functions cannot be defined. 6196 if (unsigned BuiltinID = FD->getBuiltinID()) { 6197 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6198 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6199 FD->setInvalidDecl(); 6200 } 6201 } 6202 6203 // The return type of a function definition must be complete 6204 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6205 QualType ResultType = FD->getResultType(); 6206 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6207 !FD->isInvalidDecl() && 6208 RequireCompleteType(FD->getLocation(), ResultType, 6209 diag::err_func_def_incomplete_result)) 6210 FD->setInvalidDecl(); 6211 6212 // GNU warning -Wmissing-prototypes: 6213 // Warn if a global function is defined without a previous 6214 // prototype declaration. This warning is issued even if the 6215 // definition itself provides a prototype. The aim is to detect 6216 // global functions that fail to be declared in header files. 6217 if (ShouldWarnAboutMissingPrototype(FD)) 6218 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6219 6220 if (FnBodyScope) 6221 PushDeclContext(FnBodyScope, FD); 6222 6223 // Check the validity of our function parameters 6224 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6225 /*CheckParameterNames=*/true); 6226 6227 // Introduce our parameters into the function scope 6228 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6229 ParmVarDecl *Param = FD->getParamDecl(p); 6230 Param->setOwningFunction(FD); 6231 6232 // If this has an identifier, add it to the scope stack. 6233 if (Param->getIdentifier() && FnBodyScope) { 6234 CheckShadow(FnBodyScope, Param); 6235 6236 PushOnScopeChains(Param, FnBodyScope); 6237 } 6238 } 6239 6240 // Checking attributes of current function definition 6241 // dllimport attribute. 6242 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6243 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6244 // dllimport attribute cannot be directly applied to definition. 6245 // Microsoft accepts dllimport for functions defined within class scope. 6246 if (!DA->isInherited() && 6247 !(LangOpts.Microsoft && FD->getLexicalDeclContext()->isRecord())) { 6248 Diag(FD->getLocation(), 6249 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6250 << "dllimport"; 6251 FD->setInvalidDecl(); 6252 return FD; 6253 } 6254 6255 // Visual C++ appears to not think this is an issue, so only issue 6256 // a warning when Microsoft extensions are disabled. 6257 if (!LangOpts.Microsoft) { 6258 // If a symbol previously declared dllimport is later defined, the 6259 // attribute is ignored in subsequent references, and a warning is 6260 // emitted. 6261 Diag(FD->getLocation(), 6262 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6263 << FD->getName() << "dllimport"; 6264 } 6265 } 6266 return FD; 6267} 6268 6269/// \brief Given the set of return statements within a function body, 6270/// compute the variables that are subject to the named return value 6271/// optimization. 6272/// 6273/// Each of the variables that is subject to the named return value 6274/// optimization will be marked as NRVO variables in the AST, and any 6275/// return statement that has a marked NRVO variable as its NRVO candidate can 6276/// use the named return value optimization. 6277/// 6278/// This function applies a very simplistic algorithm for NRVO: if every return 6279/// statement in the function has the same NRVO candidate, that candidate is 6280/// the NRVO variable. 6281/// 6282/// FIXME: Employ a smarter algorithm that accounts for multiple return 6283/// statements and the lifetimes of the NRVO candidates. We should be able to 6284/// find a maximal set of NRVO variables. 6285static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6286 ReturnStmt **Returns = Scope->Returns.data(); 6287 6288 const VarDecl *NRVOCandidate = 0; 6289 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6290 if (!Returns[I]->getNRVOCandidate()) 6291 return; 6292 6293 if (!NRVOCandidate) 6294 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6295 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6296 return; 6297 } 6298 6299 if (NRVOCandidate) 6300 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6301} 6302 6303Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6304 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6305} 6306 6307Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6308 bool IsInstantiation) { 6309 FunctionDecl *FD = 0; 6310 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6311 if (FunTmpl) 6312 FD = FunTmpl->getTemplatedDecl(); 6313 else 6314 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6315 6316 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6317 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6318 6319 if (FD) { 6320 FD->setBody(Body); 6321 if (FD->isMain()) { 6322 // C and C++ allow for main to automagically return 0. 6323 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6324 FD->setHasImplicitReturnZero(true); 6325 WP.disableCheckFallThrough(); 6326 } 6327 6328 // MSVC permits the use of pure specifier (=0) on function definition, 6329 // defined at class scope, warn about this non standard construct. 6330 if (getLangOptions().Microsoft && FD->isPure()) 6331 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6332 6333 if (!FD->isInvalidDecl()) { 6334 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6335 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6336 FD->getResultType(), FD); 6337 6338 // If this is a constructor, we need a vtable. 6339 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6340 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6341 6342 ComputeNRVO(Body, getCurFunction()); 6343 } 6344 6345 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6346 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6347 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6348 MD->setBody(Body); 6349 if (Body) 6350 MD->setEndLoc(Body->getLocEnd()); 6351 if (!MD->isInvalidDecl()) { 6352 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6353 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6354 MD->getResultType(), MD); 6355 } 6356 } else { 6357 return 0; 6358 } 6359 6360 // Verify and clean out per-function state. 6361 if (Body) { 6362 // C++ constructors that have function-try-blocks can't have return 6363 // statements in the handlers of that block. (C++ [except.handle]p14) 6364 // Verify this. 6365 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6366 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6367 6368 // Verify that that gotos and switch cases don't jump into scopes illegally. 6369 // Verify that that gotos and switch cases don't jump into scopes illegally. 6370 if (getCurFunction()->NeedsScopeChecking() && 6371 !dcl->isInvalidDecl() && 6372 !hasAnyErrorsInThisFunction()) 6373 DiagnoseInvalidJumps(Body); 6374 6375 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6376 if (!Destructor->getParent()->isDependentType()) 6377 CheckDestructor(Destructor); 6378 6379 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6380 Destructor->getParent()); 6381 } 6382 6383 // If any errors have occurred, clear out any temporaries that may have 6384 // been leftover. This ensures that these temporaries won't be picked up for 6385 // deletion in some later function. 6386 if (PP.getDiagnostics().hasErrorOccurred() || 6387 PP.getDiagnostics().getSuppressAllDiagnostics()) 6388 ExprTemporaries.clear(); 6389 else if (!isa<FunctionTemplateDecl>(dcl)) { 6390 // Since the body is valid, issue any analysis-based warnings that are 6391 // enabled. 6392 ActivePolicy = &WP; 6393 } 6394 6395 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6396 } 6397 6398 if (!IsInstantiation) 6399 PopDeclContext(); 6400 6401 PopFunctionOrBlockScope(ActivePolicy, dcl); 6402 6403 // If any errors have occurred, clear out any temporaries that may have 6404 // been leftover. This ensures that these temporaries won't be picked up for 6405 // deletion in some later function. 6406 if (getDiagnostics().hasErrorOccurred()) 6407 ExprTemporaries.clear(); 6408 6409 return dcl; 6410} 6411 6412/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6413/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6414NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6415 IdentifierInfo &II, Scope *S) { 6416 // Before we produce a declaration for an implicitly defined 6417 // function, see whether there was a locally-scoped declaration of 6418 // this name as a function or variable. If so, use that 6419 // (non-visible) declaration, and complain about it. 6420 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6421 = LocallyScopedExternalDecls.find(&II); 6422 if (Pos != LocallyScopedExternalDecls.end()) { 6423 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 6424 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 6425 return Pos->second; 6426 } 6427 6428 // Extension in C99. Legal in C90, but warn about it. 6429 if (II.getName().startswith("__builtin_")) 6430 Diag(Loc, diag::warn_builtin_unknown) << &II; 6431 else if (getLangOptions().C99) 6432 Diag(Loc, diag::ext_implicit_function_decl) << &II; 6433 else 6434 Diag(Loc, diag::warn_implicit_function_decl) << &II; 6435 6436 // Set a Declarator for the implicit definition: int foo(); 6437 const char *Dummy; 6438 AttributeFactory attrFactory; 6439 DeclSpec DS(attrFactory); 6440 unsigned DiagID; 6441 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 6442 (void)Error; // Silence warning. 6443 assert(!Error && "Error setting up implicit decl!"); 6444 Declarator D(DS, Declarator::BlockContext); 6445 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 6446 0, 0, true, SourceLocation(), 6447 EST_None, SourceLocation(), 6448 0, 0, 0, 0, Loc, Loc, D), 6449 DS.getAttributes(), 6450 SourceLocation()); 6451 D.SetIdentifier(&II, Loc); 6452 6453 // Insert this function into translation-unit scope. 6454 6455 DeclContext *PrevDC = CurContext; 6456 CurContext = Context.getTranslationUnitDecl(); 6457 6458 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 6459 FD->setImplicit(); 6460 6461 CurContext = PrevDC; 6462 6463 AddKnownFunctionAttributes(FD); 6464 6465 return FD; 6466} 6467 6468/// \brief Adds any function attributes that we know a priori based on 6469/// the declaration of this function. 6470/// 6471/// These attributes can apply both to implicitly-declared builtins 6472/// (like __builtin___printf_chk) or to library-declared functions 6473/// like NSLog or printf. 6474void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 6475 if (FD->isInvalidDecl()) 6476 return; 6477 6478 // If this is a built-in function, map its builtin attributes to 6479 // actual attributes. 6480 if (unsigned BuiltinID = FD->getBuiltinID()) { 6481 // Handle printf-formatting attributes. 6482 unsigned FormatIdx; 6483 bool HasVAListArg; 6484 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 6485 if (!FD->getAttr<FormatAttr>()) 6486 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6487 "printf", FormatIdx+1, 6488 HasVAListArg ? 0 : FormatIdx+2)); 6489 } 6490 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 6491 HasVAListArg)) { 6492 if (!FD->getAttr<FormatAttr>()) 6493 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6494 "scanf", FormatIdx+1, 6495 HasVAListArg ? 0 : FormatIdx+2)); 6496 } 6497 6498 // Mark const if we don't care about errno and that is the only 6499 // thing preventing the function from being const. This allows 6500 // IRgen to use LLVM intrinsics for such functions. 6501 if (!getLangOptions().MathErrno && 6502 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 6503 if (!FD->getAttr<ConstAttr>()) 6504 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6505 } 6506 6507 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 6508 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 6509 if (Context.BuiltinInfo.isConst(BuiltinID)) 6510 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6511 } 6512 6513 IdentifierInfo *Name = FD->getIdentifier(); 6514 if (!Name) 6515 return; 6516 if ((!getLangOptions().CPlusPlus && 6517 FD->getDeclContext()->isTranslationUnit()) || 6518 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 6519 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 6520 LinkageSpecDecl::lang_c)) { 6521 // Okay: this could be a libc/libm/Objective-C function we know 6522 // about. 6523 } else 6524 return; 6525 6526 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 6527 // FIXME: NSLog and NSLogv should be target specific 6528 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 6529 // FIXME: We known better than our headers. 6530 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 6531 } else 6532 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6533 "printf", 1, 6534 Name->isStr("NSLogv") ? 0 : 2)); 6535 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 6536 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 6537 // target-specific builtins, perhaps? 6538 if (!FD->getAttr<FormatAttr>()) 6539 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6540 "printf", 2, 6541 Name->isStr("vasprintf") ? 0 : 3)); 6542 } 6543} 6544 6545TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 6546 TypeSourceInfo *TInfo) { 6547 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 6548 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 6549 6550 if (!TInfo) { 6551 assert(D.isInvalidType() && "no declarator info for valid type"); 6552 TInfo = Context.getTrivialTypeSourceInfo(T); 6553 } 6554 6555 // Scope manipulation handled by caller. 6556 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 6557 D.getSourceRange().getBegin(), 6558 D.getIdentifierLoc(), 6559 D.getIdentifier(), 6560 TInfo); 6561 6562 // Bail out immediately if we have an invalid declaration. 6563 if (D.isInvalidType()) { 6564 NewTD->setInvalidDecl(); 6565 return NewTD; 6566 } 6567 6568 // C++ [dcl.typedef]p8: 6569 // If the typedef declaration defines an unnamed class (or 6570 // enum), the first typedef-name declared by the declaration 6571 // to be that class type (or enum type) is used to denote the 6572 // class type (or enum type) for linkage purposes only. 6573 // We need to check whether the type was declared in the declaration. 6574 switch (D.getDeclSpec().getTypeSpecType()) { 6575 case TST_enum: 6576 case TST_struct: 6577 case TST_union: 6578 case TST_class: { 6579 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 6580 6581 // Do nothing if the tag is not anonymous or already has an 6582 // associated typedef (from an earlier typedef in this decl group). 6583 if (tagFromDeclSpec->getIdentifier()) break; 6584 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 6585 6586 // A well-formed anonymous tag must always be a TUK_Definition. 6587 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 6588 6589 // The type must match the tag exactly; no qualifiers allowed. 6590 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 6591 break; 6592 6593 // Otherwise, set this is the anon-decl typedef for the tag. 6594 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 6595 break; 6596 } 6597 6598 default: 6599 break; 6600 } 6601 6602 return NewTD; 6603} 6604 6605 6606/// \brief Determine whether a tag with a given kind is acceptable 6607/// as a redeclaration of the given tag declaration. 6608/// 6609/// \returns true if the new tag kind is acceptable, false otherwise. 6610bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 6611 TagTypeKind NewTag, bool isDefinition, 6612 SourceLocation NewTagLoc, 6613 const IdentifierInfo &Name) { 6614 // C++ [dcl.type.elab]p3: 6615 // The class-key or enum keyword present in the 6616 // elaborated-type-specifier shall agree in kind with the 6617 // declaration to which the name in the elaborated-type-specifier 6618 // refers. This rule also applies to the form of 6619 // elaborated-type-specifier that declares a class-name or 6620 // friend class since it can be construed as referring to the 6621 // definition of the class. Thus, in any 6622 // elaborated-type-specifier, the enum keyword shall be used to 6623 // refer to an enumeration (7.2), the union class-key shall be 6624 // used to refer to a union (clause 9), and either the class or 6625 // struct class-key shall be used to refer to a class (clause 9) 6626 // declared using the class or struct class-key. 6627 TagTypeKind OldTag = Previous->getTagKind(); 6628 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 6629 if (OldTag == NewTag) 6630 return true; 6631 6632 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 6633 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 6634 // Warn about the struct/class tag mismatch. 6635 bool isTemplate = false; 6636 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 6637 isTemplate = Record->getDescribedClassTemplate(); 6638 6639 if (!ActiveTemplateInstantiations.empty()) { 6640 // In a template instantiation, do not offer fix-its for tag mismatches 6641 // since they usually mess up the template instead of fixing the problem. 6642 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 6643 << (NewTag == TTK_Class) << isTemplate << &Name; 6644 return true; 6645 } 6646 6647 if (isDefinition) { 6648 // On definitions, check previous tags and issue a fix-it for each 6649 // one that doesn't match the current tag. 6650 if (Previous->getDefinition()) { 6651 // Don't suggest fix-its for redefinitions. 6652 return true; 6653 } 6654 6655 bool previousMismatch = false; 6656 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 6657 E(Previous->redecls_end()); I != E; ++I) { 6658 if (I->getTagKind() != NewTag) { 6659 if (!previousMismatch) { 6660 previousMismatch = true; 6661 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 6662 << (NewTag == TTK_Class) << isTemplate << &Name; 6663 } 6664 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 6665 << (NewTag == TTK_Class) 6666 << FixItHint::CreateReplacement(I->getInnerLocStart(), 6667 NewTag == TTK_Class? 6668 "class" : "struct"); 6669 } 6670 } 6671 return true; 6672 } 6673 6674 // Check for a previous definition. If current tag and definition 6675 // are same type, do nothing. If no definition, but disagree with 6676 // with previous tag type, give a warning, but no fix-it. 6677 const TagDecl *Redecl = Previous->getDefinition() ? 6678 Previous->getDefinition() : Previous; 6679 if (Redecl->getTagKind() == NewTag) { 6680 return true; 6681 } 6682 6683 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 6684 << (NewTag == TTK_Class) 6685 << isTemplate << &Name; 6686 Diag(Redecl->getLocation(), diag::note_previous_use); 6687 6688 // If there is a previous defintion, suggest a fix-it. 6689 if (Previous->getDefinition()) { 6690 Diag(NewTagLoc, diag::note_struct_class_suggestion) 6691 << (Redecl->getTagKind() == TTK_Class) 6692 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 6693 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 6694 } 6695 6696 return true; 6697 } 6698 return false; 6699} 6700 6701/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 6702/// former case, Name will be non-null. In the later case, Name will be null. 6703/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 6704/// reference/declaration/definition of a tag. 6705Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 6706 SourceLocation KWLoc, CXXScopeSpec &SS, 6707 IdentifierInfo *Name, SourceLocation NameLoc, 6708 AttributeList *Attr, AccessSpecifier AS, 6709 MultiTemplateParamsArg TemplateParameterLists, 6710 bool &OwnedDecl, bool &IsDependent, 6711 bool ScopedEnum, bool ScopedEnumUsesClassTag, 6712 TypeResult UnderlyingType) { 6713 // If this is not a definition, it must have a name. 6714 assert((Name != 0 || TUK == TUK_Definition) && 6715 "Nameless record must be a definition!"); 6716 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 6717 6718 OwnedDecl = false; 6719 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6720 6721 // FIXME: Check explicit specializations more carefully. 6722 bool isExplicitSpecialization = false; 6723 bool Invalid = false; 6724 6725 // We only need to do this matching if we have template parameters 6726 // or a scope specifier, which also conveniently avoids this work 6727 // for non-C++ cases. 6728 if (TemplateParameterLists.size() > 0 || 6729 (SS.isNotEmpty() && TUK != TUK_Reference)) { 6730 if (TemplateParameterList *TemplateParams 6731 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 6732 TemplateParameterLists.get(), 6733 TemplateParameterLists.size(), 6734 TUK == TUK_Friend, 6735 isExplicitSpecialization, 6736 Invalid)) { 6737 if (TemplateParams->size() > 0) { 6738 // This is a declaration or definition of a class template (which may 6739 // be a member of another template). 6740 6741 if (Invalid) 6742 return 0; 6743 6744 OwnedDecl = false; 6745 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 6746 SS, Name, NameLoc, Attr, 6747 TemplateParams, AS, 6748 TemplateParameterLists.size() - 1, 6749 (TemplateParameterList**) TemplateParameterLists.release()); 6750 return Result.get(); 6751 } else { 6752 // The "template<>" header is extraneous. 6753 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6754 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6755 isExplicitSpecialization = true; 6756 } 6757 } 6758 } 6759 6760 // Figure out the underlying type if this a enum declaration. We need to do 6761 // this early, because it's needed to detect if this is an incompatible 6762 // redeclaration. 6763 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 6764 6765 if (Kind == TTK_Enum) { 6766 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 6767 // No underlying type explicitly specified, or we failed to parse the 6768 // type, default to int. 6769 EnumUnderlying = Context.IntTy.getTypePtr(); 6770 else if (UnderlyingType.get()) { 6771 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 6772 // integral type; any cv-qualification is ignored. 6773 TypeSourceInfo *TI = 0; 6774 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 6775 EnumUnderlying = TI; 6776 6777 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 6778 6779 if (!T->isDependentType() && !T->isIntegralType(Context)) { 6780 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 6781 << T; 6782 // Recover by falling back to int. 6783 EnumUnderlying = Context.IntTy.getTypePtr(); 6784 } 6785 6786 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 6787 UPPC_FixedUnderlyingType)) 6788 EnumUnderlying = Context.IntTy.getTypePtr(); 6789 6790 } else if (getLangOptions().Microsoft) 6791 // Microsoft enums are always of int type. 6792 EnumUnderlying = Context.IntTy.getTypePtr(); 6793 } 6794 6795 DeclContext *SearchDC = CurContext; 6796 DeclContext *DC = CurContext; 6797 bool isStdBadAlloc = false; 6798 6799 RedeclarationKind Redecl = ForRedeclaration; 6800 if (TUK == TUK_Friend || TUK == TUK_Reference) 6801 Redecl = NotForRedeclaration; 6802 6803 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 6804 6805 if (Name && SS.isNotEmpty()) { 6806 // We have a nested-name tag ('struct foo::bar'). 6807 6808 // Check for invalid 'foo::'. 6809 if (SS.isInvalid()) { 6810 Name = 0; 6811 goto CreateNewDecl; 6812 } 6813 6814 // If this is a friend or a reference to a class in a dependent 6815 // context, don't try to make a decl for it. 6816 if (TUK == TUK_Friend || TUK == TUK_Reference) { 6817 DC = computeDeclContext(SS, false); 6818 if (!DC) { 6819 IsDependent = true; 6820 return 0; 6821 } 6822 } else { 6823 DC = computeDeclContext(SS, true); 6824 if (!DC) { 6825 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 6826 << SS.getRange(); 6827 return 0; 6828 } 6829 } 6830 6831 if (RequireCompleteDeclContext(SS, DC)) 6832 return 0; 6833 6834 SearchDC = DC; 6835 // Look-up name inside 'foo::'. 6836 LookupQualifiedName(Previous, DC); 6837 6838 if (Previous.isAmbiguous()) 6839 return 0; 6840 6841 if (Previous.empty()) { 6842 // Name lookup did not find anything. However, if the 6843 // nested-name-specifier refers to the current instantiation, 6844 // and that current instantiation has any dependent base 6845 // classes, we might find something at instantiation time: treat 6846 // this as a dependent elaborated-type-specifier. 6847 // But this only makes any sense for reference-like lookups. 6848 if (Previous.wasNotFoundInCurrentInstantiation() && 6849 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6850 IsDependent = true; 6851 return 0; 6852 } 6853 6854 // A tag 'foo::bar' must already exist. 6855 Diag(NameLoc, diag::err_not_tag_in_scope) 6856 << Kind << Name << DC << SS.getRange(); 6857 Name = 0; 6858 Invalid = true; 6859 goto CreateNewDecl; 6860 } 6861 } else if (Name) { 6862 // If this is a named struct, check to see if there was a previous forward 6863 // declaration or definition. 6864 // FIXME: We're looking into outer scopes here, even when we 6865 // shouldn't be. Doing so can result in ambiguities that we 6866 // shouldn't be diagnosing. 6867 LookupName(Previous, S); 6868 6869 if (Previous.isAmbiguous() && 6870 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 6871 LookupResult::Filter F = Previous.makeFilter(); 6872 while (F.hasNext()) { 6873 NamedDecl *ND = F.next(); 6874 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 6875 F.erase(); 6876 } 6877 F.done(); 6878 } 6879 6880 // Note: there used to be some attempt at recovery here. 6881 if (Previous.isAmbiguous()) 6882 return 0; 6883 6884 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 6885 // FIXME: This makes sure that we ignore the contexts associated 6886 // with C structs, unions, and enums when looking for a matching 6887 // tag declaration or definition. See the similar lookup tweak 6888 // in Sema::LookupName; is there a better way to deal with this? 6889 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 6890 SearchDC = SearchDC->getParent(); 6891 } 6892 } else if (S->isFunctionPrototypeScope()) { 6893 // If this is an enum declaration in function prototype scope, set its 6894 // initial context to the translation unit. 6895 SearchDC = Context.getTranslationUnitDecl(); 6896 } 6897 6898 if (Previous.isSingleResult() && 6899 Previous.getFoundDecl()->isTemplateParameter()) { 6900 // Maybe we will complain about the shadowed template parameter. 6901 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 6902 // Just pretend that we didn't see the previous declaration. 6903 Previous.clear(); 6904 } 6905 6906 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 6907 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 6908 // This is a declaration of or a reference to "std::bad_alloc". 6909 isStdBadAlloc = true; 6910 6911 if (Previous.empty() && StdBadAlloc) { 6912 // std::bad_alloc has been implicitly declared (but made invisible to 6913 // name lookup). Fill in this implicit declaration as the previous 6914 // declaration, so that the declarations get chained appropriately. 6915 Previous.addDecl(getStdBadAlloc()); 6916 } 6917 } 6918 6919 // If we didn't find a previous declaration, and this is a reference 6920 // (or friend reference), move to the correct scope. In C++, we 6921 // also need to do a redeclaration lookup there, just in case 6922 // there's a shadow friend decl. 6923 if (Name && Previous.empty() && 6924 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6925 if (Invalid) goto CreateNewDecl; 6926 assert(SS.isEmpty()); 6927 6928 if (TUK == TUK_Reference) { 6929 // C++ [basic.scope.pdecl]p5: 6930 // -- for an elaborated-type-specifier of the form 6931 // 6932 // class-key identifier 6933 // 6934 // if the elaborated-type-specifier is used in the 6935 // decl-specifier-seq or parameter-declaration-clause of a 6936 // function defined in namespace scope, the identifier is 6937 // declared as a class-name in the namespace that contains 6938 // the declaration; otherwise, except as a friend 6939 // declaration, the identifier is declared in the smallest 6940 // non-class, non-function-prototype scope that contains the 6941 // declaration. 6942 // 6943 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 6944 // C structs and unions. 6945 // 6946 // It is an error in C++ to declare (rather than define) an enum 6947 // type, including via an elaborated type specifier. We'll 6948 // diagnose that later; for now, declare the enum in the same 6949 // scope as we would have picked for any other tag type. 6950 // 6951 // GNU C also supports this behavior as part of its incomplete 6952 // enum types extension, while GNU C++ does not. 6953 // 6954 // Find the context where we'll be declaring the tag. 6955 // FIXME: We would like to maintain the current DeclContext as the 6956 // lexical context, 6957 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 6958 SearchDC = SearchDC->getParent(); 6959 6960 // Find the scope where we'll be declaring the tag. 6961 while (S->isClassScope() || 6962 (getLangOptions().CPlusPlus && 6963 S->isFunctionPrototypeScope()) || 6964 ((S->getFlags() & Scope::DeclScope) == 0) || 6965 (S->getEntity() && 6966 ((DeclContext *)S->getEntity())->isTransparentContext())) 6967 S = S->getParent(); 6968 } else { 6969 assert(TUK == TUK_Friend); 6970 // C++ [namespace.memdef]p3: 6971 // If a friend declaration in a non-local class first declares a 6972 // class or function, the friend class or function is a member of 6973 // the innermost enclosing namespace. 6974 SearchDC = SearchDC->getEnclosingNamespaceContext(); 6975 } 6976 6977 // In C++, we need to do a redeclaration lookup to properly 6978 // diagnose some problems. 6979 if (getLangOptions().CPlusPlus) { 6980 Previous.setRedeclarationKind(ForRedeclaration); 6981 LookupQualifiedName(Previous, SearchDC); 6982 } 6983 } 6984 6985 if (!Previous.empty()) { 6986 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 6987 6988 // It's okay to have a tag decl in the same scope as a typedef 6989 // which hides a tag decl in the same scope. Finding this 6990 // insanity with a redeclaration lookup can only actually happen 6991 // in C++. 6992 // 6993 // This is also okay for elaborated-type-specifiers, which is 6994 // technically forbidden by the current standard but which is 6995 // okay according to the likely resolution of an open issue; 6996 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 6997 if (getLangOptions().CPlusPlus) { 6998 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 6999 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7000 TagDecl *Tag = TT->getDecl(); 7001 if (Tag->getDeclName() == Name && 7002 Tag->getDeclContext()->getRedeclContext() 7003 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7004 PrevDecl = Tag; 7005 Previous.clear(); 7006 Previous.addDecl(Tag); 7007 Previous.resolveKind(); 7008 } 7009 } 7010 } 7011 } 7012 7013 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7014 // If this is a use of a previous tag, or if the tag is already declared 7015 // in the same scope (so that the definition/declaration completes or 7016 // rementions the tag), reuse the decl. 7017 if (TUK == TUK_Reference || TUK == TUK_Friend || 7018 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7019 // Make sure that this wasn't declared as an enum and now used as a 7020 // struct or something similar. 7021 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7022 TUK == TUK_Definition, KWLoc, 7023 *Name)) { 7024 bool SafeToContinue 7025 = (PrevTagDecl->getTagKind() != TTK_Enum && 7026 Kind != TTK_Enum); 7027 if (SafeToContinue) 7028 Diag(KWLoc, diag::err_use_with_wrong_tag) 7029 << Name 7030 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7031 PrevTagDecl->getKindName()); 7032 else 7033 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7034 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7035 7036 if (SafeToContinue) 7037 Kind = PrevTagDecl->getTagKind(); 7038 else { 7039 // Recover by making this an anonymous redefinition. 7040 Name = 0; 7041 Previous.clear(); 7042 Invalid = true; 7043 } 7044 } 7045 7046 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7047 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7048 7049 // All conflicts with previous declarations are recovered by 7050 // returning the previous declaration. 7051 if (ScopedEnum != PrevEnum->isScoped()) { 7052 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7053 << PrevEnum->isScoped(); 7054 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7055 return PrevTagDecl; 7056 } 7057 else if (EnumUnderlying && PrevEnum->isFixed()) { 7058 QualType T; 7059 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7060 T = TI->getType(); 7061 else 7062 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7063 7064 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7065 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7066 diag::err_enum_redeclare_type_mismatch) 7067 << T 7068 << PrevEnum->getIntegerType(); 7069 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7070 return PrevTagDecl; 7071 } 7072 } 7073 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7074 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7075 << PrevEnum->isFixed(); 7076 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7077 return PrevTagDecl; 7078 } 7079 } 7080 7081 if (!Invalid) { 7082 // If this is a use, just return the declaration we found. 7083 7084 // FIXME: In the future, return a variant or some other clue 7085 // for the consumer of this Decl to know it doesn't own it. 7086 // For our current ASTs this shouldn't be a problem, but will 7087 // need to be changed with DeclGroups. 7088 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7089 getLangOptions().Microsoft)) || TUK == TUK_Friend) 7090 return PrevTagDecl; 7091 7092 // Diagnose attempts to redefine a tag. 7093 if (TUK == TUK_Definition) { 7094 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7095 // If we're defining a specialization and the previous definition 7096 // is from an implicit instantiation, don't emit an error 7097 // here; we'll catch this in the general case below. 7098 if (!isExplicitSpecialization || 7099 !isa<CXXRecordDecl>(Def) || 7100 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7101 == TSK_ExplicitSpecialization) { 7102 Diag(NameLoc, diag::err_redefinition) << Name; 7103 Diag(Def->getLocation(), diag::note_previous_definition); 7104 // If this is a redefinition, recover by making this 7105 // struct be anonymous, which will make any later 7106 // references get the previous definition. 7107 Name = 0; 7108 Previous.clear(); 7109 Invalid = true; 7110 } 7111 } else { 7112 // If the type is currently being defined, complain 7113 // about a nested redefinition. 7114 const TagType *Tag 7115 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7116 if (Tag->isBeingDefined()) { 7117 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7118 Diag(PrevTagDecl->getLocation(), 7119 diag::note_previous_definition); 7120 Name = 0; 7121 Previous.clear(); 7122 Invalid = true; 7123 } 7124 } 7125 7126 // Okay, this is definition of a previously declared or referenced 7127 // tag PrevDecl. We're going to create a new Decl for it. 7128 } 7129 } 7130 // If we get here we have (another) forward declaration or we 7131 // have a definition. Just create a new decl. 7132 7133 } else { 7134 // If we get here, this is a definition of a new tag type in a nested 7135 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7136 // new decl/type. We set PrevDecl to NULL so that the entities 7137 // have distinct types. 7138 Previous.clear(); 7139 } 7140 // If we get here, we're going to create a new Decl. If PrevDecl 7141 // is non-NULL, it's a definition of the tag declared by 7142 // PrevDecl. If it's NULL, we have a new definition. 7143 7144 7145 // Otherwise, PrevDecl is not a tag, but was found with tag 7146 // lookup. This is only actually possible in C++, where a few 7147 // things like templates still live in the tag namespace. 7148 } else { 7149 assert(getLangOptions().CPlusPlus); 7150 7151 // Use a better diagnostic if an elaborated-type-specifier 7152 // found the wrong kind of type on the first 7153 // (non-redeclaration) lookup. 7154 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7155 !Previous.isForRedeclaration()) { 7156 unsigned Kind = 0; 7157 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7158 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7159 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7160 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7161 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7162 Invalid = true; 7163 7164 // Otherwise, only diagnose if the declaration is in scope. 7165 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7166 isExplicitSpecialization)) { 7167 // do nothing 7168 7169 // Diagnose implicit declarations introduced by elaborated types. 7170 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7171 unsigned Kind = 0; 7172 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7173 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7174 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7175 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7176 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7177 Invalid = true; 7178 7179 // Otherwise it's a declaration. Call out a particularly common 7180 // case here. 7181 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7182 unsigned Kind = 0; 7183 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7184 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7185 << Name << Kind << TND->getUnderlyingType(); 7186 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7187 Invalid = true; 7188 7189 // Otherwise, diagnose. 7190 } else { 7191 // The tag name clashes with something else in the target scope, 7192 // issue an error and recover by making this tag be anonymous. 7193 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7194 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7195 Name = 0; 7196 Invalid = true; 7197 } 7198 7199 // The existing declaration isn't relevant to us; we're in a 7200 // new scope, so clear out the previous declaration. 7201 Previous.clear(); 7202 } 7203 } 7204 7205CreateNewDecl: 7206 7207 TagDecl *PrevDecl = 0; 7208 if (Previous.isSingleResult()) 7209 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7210 7211 // If there is an identifier, use the location of the identifier as the 7212 // location of the decl, otherwise use the location of the struct/union 7213 // keyword. 7214 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7215 7216 // Otherwise, create a new declaration. If there is a previous 7217 // declaration of the same entity, the two will be linked via 7218 // PrevDecl. 7219 TagDecl *New; 7220 7221 bool IsForwardReference = false; 7222 if (Kind == TTK_Enum) { 7223 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7224 // enum X { A, B, C } D; D should chain to X. 7225 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7226 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7227 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7228 // If this is an undefined enum, warn. 7229 if (TUK != TUK_Definition && !Invalid) { 7230 TagDecl *Def; 7231 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7232 // C++0x: 7.2p2: opaque-enum-declaration. 7233 // Conflicts are diagnosed above. Do nothing. 7234 } 7235 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7236 Diag(Loc, diag::ext_forward_ref_enum_def) 7237 << New; 7238 Diag(Def->getLocation(), diag::note_previous_definition); 7239 } else { 7240 unsigned DiagID = diag::ext_forward_ref_enum; 7241 if (getLangOptions().Microsoft) 7242 DiagID = diag::ext_ms_forward_ref_enum; 7243 else if (getLangOptions().CPlusPlus) 7244 DiagID = diag::err_forward_ref_enum; 7245 Diag(Loc, DiagID); 7246 7247 // If this is a forward-declared reference to an enumeration, make a 7248 // note of it; we won't actually be introducing the declaration into 7249 // the declaration context. 7250 if (TUK == TUK_Reference) 7251 IsForwardReference = true; 7252 } 7253 } 7254 7255 if (EnumUnderlying) { 7256 EnumDecl *ED = cast<EnumDecl>(New); 7257 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7258 ED->setIntegerTypeSourceInfo(TI); 7259 else 7260 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7261 ED->setPromotionType(ED->getIntegerType()); 7262 } 7263 7264 } else { 7265 // struct/union/class 7266 7267 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7268 // struct X { int A; } D; D should chain to X. 7269 if (getLangOptions().CPlusPlus) { 7270 // FIXME: Look for a way to use RecordDecl for simple structs. 7271 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7272 cast_or_null<CXXRecordDecl>(PrevDecl)); 7273 7274 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7275 StdBadAlloc = cast<CXXRecordDecl>(New); 7276 } else 7277 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7278 cast_or_null<RecordDecl>(PrevDecl)); 7279 } 7280 7281 // Maybe add qualifier info. 7282 if (SS.isNotEmpty()) { 7283 if (SS.isSet()) { 7284 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7285 if (TemplateParameterLists.size() > 0) { 7286 New->setTemplateParameterListsInfo(Context, 7287 TemplateParameterLists.size(), 7288 (TemplateParameterList**) TemplateParameterLists.release()); 7289 } 7290 } 7291 else 7292 Invalid = true; 7293 } 7294 7295 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7296 // Add alignment attributes if necessary; these attributes are checked when 7297 // the ASTContext lays out the structure. 7298 // 7299 // It is important for implementing the correct semantics that this 7300 // happen here (in act on tag decl). The #pragma pack stack is 7301 // maintained as a result of parser callbacks which can occur at 7302 // many points during the parsing of a struct declaration (because 7303 // the #pragma tokens are effectively skipped over during the 7304 // parsing of the struct). 7305 AddAlignmentAttributesForRecord(RD); 7306 7307 AddMsStructLayoutForRecord(RD); 7308 } 7309 7310 // If this is a specialization of a member class (of a class template), 7311 // check the specialization. 7312 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7313 Invalid = true; 7314 7315 if (Invalid) 7316 New->setInvalidDecl(); 7317 7318 if (Attr) 7319 ProcessDeclAttributeList(S, New, Attr); 7320 7321 // If we're declaring or defining a tag in function prototype scope 7322 // in C, note that this type can only be used within the function. 7323 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7324 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7325 7326 // Set the lexical context. If the tag has a C++ scope specifier, the 7327 // lexical context will be different from the semantic context. 7328 New->setLexicalDeclContext(CurContext); 7329 7330 // Mark this as a friend decl if applicable. 7331 // In Microsoft mode, a friend declaration also acts as a forward 7332 // declaration so we always pass true to setObjectOfFriendDecl to make 7333 // the tag name visible. 7334 if (TUK == TUK_Friend) 7335 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 7336 getLangOptions().Microsoft); 7337 7338 // Set the access specifier. 7339 if (!Invalid && SearchDC->isRecord()) 7340 SetMemberAccessSpecifier(New, PrevDecl, AS); 7341 7342 if (TUK == TUK_Definition) 7343 New->startDefinition(); 7344 7345 // If this has an identifier, add it to the scope stack. 7346 if (TUK == TUK_Friend) { 7347 // We might be replacing an existing declaration in the lookup tables; 7348 // if so, borrow its access specifier. 7349 if (PrevDecl) 7350 New->setAccess(PrevDecl->getAccess()); 7351 7352 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7353 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7354 if (Name) // can be null along some error paths 7355 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7356 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7357 } else if (Name) { 7358 S = getNonFieldDeclScope(S); 7359 PushOnScopeChains(New, S, !IsForwardReference); 7360 if (IsForwardReference) 7361 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7362 7363 } else { 7364 CurContext->addDecl(New); 7365 } 7366 7367 // If this is the C FILE type, notify the AST context. 7368 if (IdentifierInfo *II = New->getIdentifier()) 7369 if (!New->isInvalidDecl() && 7370 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7371 II->isStr("FILE")) 7372 Context.setFILEDecl(New); 7373 7374 OwnedDecl = true; 7375 return New; 7376} 7377 7378void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7379 AdjustDeclIfTemplate(TagD); 7380 TagDecl *Tag = cast<TagDecl>(TagD); 7381 7382 // Enter the tag context. 7383 PushDeclContext(S, Tag); 7384} 7385 7386void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 7387 SourceLocation FinalLoc, 7388 SourceLocation LBraceLoc) { 7389 AdjustDeclIfTemplate(TagD); 7390 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 7391 7392 FieldCollector->StartClass(); 7393 7394 if (!Record->getIdentifier()) 7395 return; 7396 7397 if (FinalLoc.isValid()) 7398 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 7399 7400 // C++ [class]p2: 7401 // [...] The class-name is also inserted into the scope of the 7402 // class itself; this is known as the injected-class-name. For 7403 // purposes of access checking, the injected-class-name is treated 7404 // as if it were a public member name. 7405 CXXRecordDecl *InjectedClassName 7406 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 7407 Record->getLocStart(), Record->getLocation(), 7408 Record->getIdentifier(), 7409 /*PrevDecl=*/0, 7410 /*DelayTypeCreation=*/true); 7411 Context.getTypeDeclType(InjectedClassName, Record); 7412 InjectedClassName->setImplicit(); 7413 InjectedClassName->setAccess(AS_public); 7414 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 7415 InjectedClassName->setDescribedClassTemplate(Template); 7416 PushOnScopeChains(InjectedClassName, S); 7417 assert(InjectedClassName->isInjectedClassName() && 7418 "Broken injected-class-name"); 7419} 7420 7421void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 7422 SourceLocation RBraceLoc) { 7423 AdjustDeclIfTemplate(TagD); 7424 TagDecl *Tag = cast<TagDecl>(TagD); 7425 Tag->setRBraceLoc(RBraceLoc); 7426 7427 if (isa<CXXRecordDecl>(Tag)) 7428 FieldCollector->FinishClass(); 7429 7430 // Exit this scope of this tag's definition. 7431 PopDeclContext(); 7432 7433 // Notify the consumer that we've defined a tag. 7434 Consumer.HandleTagDeclDefinition(Tag); 7435} 7436 7437void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 7438 AdjustDeclIfTemplate(TagD); 7439 TagDecl *Tag = cast<TagDecl>(TagD); 7440 Tag->setInvalidDecl(); 7441 7442 // We're undoing ActOnTagStartDefinition here, not 7443 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 7444 // the FieldCollector. 7445 7446 PopDeclContext(); 7447} 7448 7449// Note that FieldName may be null for anonymous bitfields. 7450bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 7451 QualType FieldTy, const Expr *BitWidth, 7452 bool *ZeroWidth) { 7453 // Default to true; that shouldn't confuse checks for emptiness 7454 if (ZeroWidth) 7455 *ZeroWidth = true; 7456 7457 // C99 6.7.2.1p4 - verify the field type. 7458 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 7459 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 7460 // Handle incomplete types with specific error. 7461 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 7462 return true; 7463 if (FieldName) 7464 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 7465 << FieldName << FieldTy << BitWidth->getSourceRange(); 7466 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 7467 << FieldTy << BitWidth->getSourceRange(); 7468 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 7469 UPPC_BitFieldWidth)) 7470 return true; 7471 7472 // If the bit-width is type- or value-dependent, don't try to check 7473 // it now. 7474 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 7475 return false; 7476 7477 llvm::APSInt Value; 7478 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 7479 return true; 7480 7481 if (Value != 0 && ZeroWidth) 7482 *ZeroWidth = false; 7483 7484 // Zero-width bitfield is ok for anonymous field. 7485 if (Value == 0 && FieldName) 7486 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 7487 7488 if (Value.isSigned() && Value.isNegative()) { 7489 if (FieldName) 7490 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 7491 << FieldName << Value.toString(10); 7492 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 7493 << Value.toString(10); 7494 } 7495 7496 if (!FieldTy->isDependentType()) { 7497 uint64_t TypeSize = Context.getTypeSize(FieldTy); 7498 if (Value.getZExtValue() > TypeSize) { 7499 if (!getLangOptions().CPlusPlus) { 7500 if (FieldName) 7501 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 7502 << FieldName << (unsigned)Value.getZExtValue() 7503 << (unsigned)TypeSize; 7504 7505 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 7506 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7507 } 7508 7509 if (FieldName) 7510 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 7511 << FieldName << (unsigned)Value.getZExtValue() 7512 << (unsigned)TypeSize; 7513 else 7514 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 7515 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7516 } 7517 } 7518 7519 return false; 7520} 7521 7522/// ActOnField - Each field of a C struct/union is passed into this in order 7523/// to create a FieldDecl object for it. 7524Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 7525 Declarator &D, ExprTy *BitfieldWidth) { 7526 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 7527 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 7528 /*HasInit=*/false, AS_public); 7529 return Res; 7530} 7531 7532/// HandleField - Analyze a field of a C struct or a C++ data member. 7533/// 7534FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 7535 SourceLocation DeclStart, 7536 Declarator &D, Expr *BitWidth, bool HasInit, 7537 AccessSpecifier AS) { 7538 IdentifierInfo *II = D.getIdentifier(); 7539 SourceLocation Loc = DeclStart; 7540 if (II) Loc = D.getIdentifierLoc(); 7541 7542 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7543 QualType T = TInfo->getType(); 7544 if (getLangOptions().CPlusPlus) { 7545 CheckExtraCXXDefaultArguments(D); 7546 7547 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7548 UPPC_DataMemberType)) { 7549 D.setInvalidType(); 7550 T = Context.IntTy; 7551 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 7552 } 7553 } 7554 7555 DiagnoseFunctionSpecifiers(D); 7556 7557 if (D.getDeclSpec().isThreadSpecified()) 7558 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7559 7560 // Check to see if this name was declared as a member previously 7561 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 7562 LookupName(Previous, S); 7563 assert((Previous.empty() || Previous.isOverloadedResult() || 7564 Previous.isSingleResult()) 7565 && "Lookup of member name should be either overloaded, single or null"); 7566 7567 // If the name is overloaded then get any declaration else get the single result 7568 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 7569 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 7570 7571 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7572 // Maybe we will complain about the shadowed template parameter. 7573 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7574 // Just pretend that we didn't see the previous declaration. 7575 PrevDecl = 0; 7576 } 7577 7578 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 7579 PrevDecl = 0; 7580 7581 bool Mutable 7582 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 7583 SourceLocation TSSL = D.getSourceRange().getBegin(); 7584 FieldDecl *NewFD 7585 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 7586 TSSL, AS, PrevDecl, &D); 7587 7588 if (NewFD->isInvalidDecl()) 7589 Record->setInvalidDecl(); 7590 7591 if (NewFD->isInvalidDecl() && PrevDecl) { 7592 // Don't introduce NewFD into scope; there's already something 7593 // with the same name in the same scope. 7594 } else if (II) { 7595 PushOnScopeChains(NewFD, S); 7596 } else 7597 Record->addDecl(NewFD); 7598 7599 return NewFD; 7600} 7601 7602/// \brief Build a new FieldDecl and check its well-formedness. 7603/// 7604/// This routine builds a new FieldDecl given the fields name, type, 7605/// record, etc. \p PrevDecl should refer to any previous declaration 7606/// with the same name and in the same scope as the field to be 7607/// created. 7608/// 7609/// \returns a new FieldDecl. 7610/// 7611/// \todo The Declarator argument is a hack. It will be removed once 7612FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 7613 TypeSourceInfo *TInfo, 7614 RecordDecl *Record, SourceLocation Loc, 7615 bool Mutable, Expr *BitWidth, bool HasInit, 7616 SourceLocation TSSL, 7617 AccessSpecifier AS, NamedDecl *PrevDecl, 7618 Declarator *D) { 7619 IdentifierInfo *II = Name.getAsIdentifierInfo(); 7620 bool InvalidDecl = false; 7621 if (D) InvalidDecl = D->isInvalidType(); 7622 7623 // If we receive a broken type, recover by assuming 'int' and 7624 // marking this declaration as invalid. 7625 if (T.isNull()) { 7626 InvalidDecl = true; 7627 T = Context.IntTy; 7628 } 7629 7630 QualType EltTy = Context.getBaseElementType(T); 7631 if (!EltTy->isDependentType() && 7632 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 7633 // Fields of incomplete type force their record to be invalid. 7634 Record->setInvalidDecl(); 7635 InvalidDecl = true; 7636 } 7637 7638 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7639 // than a variably modified type. 7640 if (!InvalidDecl && T->isVariablyModifiedType()) { 7641 bool SizeIsNegative; 7642 llvm::APSInt Oversized; 7643 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 7644 SizeIsNegative, 7645 Oversized); 7646 if (!FixedTy.isNull()) { 7647 Diag(Loc, diag::warn_illegal_constant_array_size); 7648 T = FixedTy; 7649 } else { 7650 if (SizeIsNegative) 7651 Diag(Loc, diag::err_typecheck_negative_array_size); 7652 else if (Oversized.getBoolValue()) 7653 Diag(Loc, diag::err_array_too_large) 7654 << Oversized.toString(10); 7655 else 7656 Diag(Loc, diag::err_typecheck_field_variable_size); 7657 InvalidDecl = true; 7658 } 7659 } 7660 7661 // Fields can not have abstract class types 7662 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 7663 diag::err_abstract_type_in_decl, 7664 AbstractFieldType)) 7665 InvalidDecl = true; 7666 7667 bool ZeroWidth = false; 7668 // If this is declared as a bit-field, check the bit-field. 7669 if (!InvalidDecl && BitWidth && 7670 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 7671 InvalidDecl = true; 7672 BitWidth = 0; 7673 ZeroWidth = false; 7674 } 7675 7676 // Check that 'mutable' is consistent with the type of the declaration. 7677 if (!InvalidDecl && Mutable) { 7678 unsigned DiagID = 0; 7679 if (T->isReferenceType()) 7680 DiagID = diag::err_mutable_reference; 7681 else if (T.isConstQualified()) 7682 DiagID = diag::err_mutable_const; 7683 7684 if (DiagID) { 7685 SourceLocation ErrLoc = Loc; 7686 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 7687 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 7688 Diag(ErrLoc, DiagID); 7689 Mutable = false; 7690 InvalidDecl = true; 7691 } 7692 } 7693 7694 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 7695 BitWidth, Mutable, HasInit); 7696 if (InvalidDecl) 7697 NewFD->setInvalidDecl(); 7698 7699 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 7700 Diag(Loc, diag::err_duplicate_member) << II; 7701 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7702 NewFD->setInvalidDecl(); 7703 } 7704 7705 if (!InvalidDecl && getLangOptions().CPlusPlus) { 7706 if (Record->isUnion()) { 7707 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 7708 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 7709 if (RDecl->getDefinition()) { 7710 // C++ [class.union]p1: An object of a class with a non-trivial 7711 // constructor, a non-trivial copy constructor, a non-trivial 7712 // destructor, or a non-trivial copy assignment operator 7713 // cannot be a member of a union, nor can an array of such 7714 // objects. 7715 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 7716 NewFD->setInvalidDecl(); 7717 } 7718 } 7719 7720 // C++ [class.union]p1: If a union contains a member of reference type, 7721 // the program is ill-formed. 7722 if (EltTy->isReferenceType()) { 7723 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 7724 << NewFD->getDeclName() << EltTy; 7725 NewFD->setInvalidDecl(); 7726 } 7727 } 7728 } 7729 7730 // FIXME: We need to pass in the attributes given an AST 7731 // representation, not a parser representation. 7732 if (D) 7733 // FIXME: What to pass instead of TUScope? 7734 ProcessDeclAttributes(TUScope, NewFD, *D); 7735 7736 if (T.isObjCGCWeak()) 7737 Diag(Loc, diag::warn_attribute_weak_on_field); 7738 7739 NewFD->setAccess(AS); 7740 return NewFD; 7741} 7742 7743bool Sema::CheckNontrivialField(FieldDecl *FD) { 7744 assert(FD); 7745 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 7746 7747 if (FD->isInvalidDecl()) 7748 return true; 7749 7750 QualType EltTy = Context.getBaseElementType(FD->getType()); 7751 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 7752 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 7753 if (RDecl->getDefinition()) { 7754 // We check for copy constructors before constructors 7755 // because otherwise we'll never get complaints about 7756 // copy constructors. 7757 7758 CXXSpecialMember member = CXXInvalid; 7759 if (!RDecl->hasTrivialCopyConstructor()) 7760 member = CXXCopyConstructor; 7761 else if (!RDecl->hasTrivialDefaultConstructor()) 7762 member = CXXDefaultConstructor; 7763 else if (!RDecl->hasTrivialCopyAssignment()) 7764 member = CXXCopyAssignment; 7765 else if (!RDecl->hasTrivialDestructor()) 7766 member = CXXDestructor; 7767 7768 if (member != CXXInvalid) { 7769 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 7770 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 7771 DiagnoseNontrivial(RT, member); 7772 return true; 7773 } 7774 } 7775 } 7776 7777 return false; 7778} 7779 7780/// DiagnoseNontrivial - Given that a class has a non-trivial 7781/// special member, figure out why. 7782void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 7783 QualType QT(T, 0U); 7784 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 7785 7786 // Check whether the member was user-declared. 7787 switch (member) { 7788 case CXXInvalid: 7789 break; 7790 7791 case CXXDefaultConstructor: 7792 if (RD->hasUserDeclaredConstructor()) { 7793 typedef CXXRecordDecl::ctor_iterator ctor_iter; 7794 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 7795 const FunctionDecl *body = 0; 7796 ci->hasBody(body); 7797 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 7798 SourceLocation CtorLoc = ci->getLocation(); 7799 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7800 return; 7801 } 7802 } 7803 7804 assert(0 && "found no user-declared constructors"); 7805 return; 7806 } 7807 break; 7808 7809 case CXXCopyConstructor: 7810 if (RD->hasUserDeclaredCopyConstructor()) { 7811 SourceLocation CtorLoc = 7812 RD->getCopyConstructor(0)->getLocation(); 7813 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7814 return; 7815 } 7816 break; 7817 7818 case CXXMoveConstructor: 7819 if (RD->hasUserDeclaredMoveConstructor()) { 7820 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 7821 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7822 return; 7823 } 7824 break; 7825 7826 case CXXCopyAssignment: 7827 if (RD->hasUserDeclaredCopyAssignment()) { 7828 // FIXME: this should use the location of the copy 7829 // assignment, not the type. 7830 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 7831 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 7832 return; 7833 } 7834 break; 7835 7836 case CXXMoveAssignment: 7837 if (RD->hasUserDeclaredMoveAssignment()) { 7838 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 7839 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 7840 return; 7841 } 7842 break; 7843 7844 case CXXDestructor: 7845 if (RD->hasUserDeclaredDestructor()) { 7846 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 7847 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7848 return; 7849 } 7850 break; 7851 } 7852 7853 typedef CXXRecordDecl::base_class_iterator base_iter; 7854 7855 // Virtual bases and members inhibit trivial copying/construction, 7856 // but not trivial destruction. 7857 if (member != CXXDestructor) { 7858 // Check for virtual bases. vbases includes indirect virtual bases, 7859 // so we just iterate through the direct bases. 7860 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 7861 if (bi->isVirtual()) { 7862 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7863 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 7864 return; 7865 } 7866 7867 // Check for virtual methods. 7868 typedef CXXRecordDecl::method_iterator meth_iter; 7869 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 7870 ++mi) { 7871 if (mi->isVirtual()) { 7872 SourceLocation MLoc = mi->getSourceRange().getBegin(); 7873 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 7874 return; 7875 } 7876 } 7877 } 7878 7879 bool (CXXRecordDecl::*hasTrivial)() const; 7880 switch (member) { 7881 case CXXDefaultConstructor: 7882 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 7883 case CXXCopyConstructor: 7884 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 7885 case CXXCopyAssignment: 7886 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 7887 case CXXDestructor: 7888 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 7889 default: 7890 assert(0 && "unexpected special member"); return; 7891 } 7892 7893 // Check for nontrivial bases (and recurse). 7894 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 7895 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 7896 assert(BaseRT && "Don't know how to handle dependent bases"); 7897 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 7898 if (!(BaseRecTy->*hasTrivial)()) { 7899 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7900 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 7901 DiagnoseNontrivial(BaseRT, member); 7902 return; 7903 } 7904 } 7905 7906 // Check for nontrivial members (and recurse). 7907 typedef RecordDecl::field_iterator field_iter; 7908 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 7909 ++fi) { 7910 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 7911 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 7912 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 7913 7914 if (!(EltRD->*hasTrivial)()) { 7915 SourceLocation FLoc = (*fi)->getLocation(); 7916 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 7917 DiagnoseNontrivial(EltRT, member); 7918 return; 7919 } 7920 } 7921 } 7922 7923 assert(0 && "found no explanation for non-trivial member"); 7924} 7925 7926/// TranslateIvarVisibility - Translate visibility from a token ID to an 7927/// AST enum value. 7928static ObjCIvarDecl::AccessControl 7929TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 7930 switch (ivarVisibility) { 7931 default: assert(0 && "Unknown visitibility kind"); 7932 case tok::objc_private: return ObjCIvarDecl::Private; 7933 case tok::objc_public: return ObjCIvarDecl::Public; 7934 case tok::objc_protected: return ObjCIvarDecl::Protected; 7935 case tok::objc_package: return ObjCIvarDecl::Package; 7936 } 7937} 7938 7939/// ActOnIvar - Each ivar field of an objective-c class is passed into this 7940/// in order to create an IvarDecl object for it. 7941Decl *Sema::ActOnIvar(Scope *S, 7942 SourceLocation DeclStart, 7943 Decl *IntfDecl, 7944 Declarator &D, ExprTy *BitfieldWidth, 7945 tok::ObjCKeywordKind Visibility) { 7946 7947 IdentifierInfo *II = D.getIdentifier(); 7948 Expr *BitWidth = (Expr*)BitfieldWidth; 7949 SourceLocation Loc = DeclStart; 7950 if (II) Loc = D.getIdentifierLoc(); 7951 7952 // FIXME: Unnamed fields can be handled in various different ways, for 7953 // example, unnamed unions inject all members into the struct namespace! 7954 7955 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7956 QualType T = TInfo->getType(); 7957 7958 if (BitWidth) { 7959 // 6.7.2.1p3, 6.7.2.1p4 7960 if (VerifyBitField(Loc, II, T, BitWidth)) { 7961 D.setInvalidType(); 7962 BitWidth = 0; 7963 } 7964 } else { 7965 // Not a bitfield. 7966 7967 // validate II. 7968 7969 } 7970 if (T->isReferenceType()) { 7971 Diag(Loc, diag::err_ivar_reference_type); 7972 D.setInvalidType(); 7973 } 7974 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7975 // than a variably modified type. 7976 else if (T->isVariablyModifiedType()) { 7977 Diag(Loc, diag::err_typecheck_ivar_variable_size); 7978 D.setInvalidType(); 7979 } 7980 7981 // Get the visibility (access control) for this ivar. 7982 ObjCIvarDecl::AccessControl ac = 7983 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 7984 : ObjCIvarDecl::None; 7985 // Must set ivar's DeclContext to its enclosing interface. 7986 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 7987 ObjCContainerDecl *EnclosingContext; 7988 if (ObjCImplementationDecl *IMPDecl = 7989 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 7990 if (!LangOpts.ObjCNonFragileABI2) { 7991 // Case of ivar declared in an implementation. Context is that of its class. 7992 EnclosingContext = IMPDecl->getClassInterface(); 7993 assert(EnclosingContext && "Implementation has no class interface!"); 7994 } 7995 else 7996 EnclosingContext = EnclosingDecl; 7997 } else { 7998 if (ObjCCategoryDecl *CDecl = 7999 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8000 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8001 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8002 return 0; 8003 } 8004 } 8005 EnclosingContext = EnclosingDecl; 8006 } 8007 8008 // Construct the decl. 8009 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8010 DeclStart, Loc, II, T, 8011 TInfo, ac, (Expr *)BitfieldWidth); 8012 8013 if (II) { 8014 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8015 ForRedeclaration); 8016 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8017 && !isa<TagDecl>(PrevDecl)) { 8018 Diag(Loc, diag::err_duplicate_member) << II; 8019 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8020 NewID->setInvalidDecl(); 8021 } 8022 } 8023 8024 // Process attributes attached to the ivar. 8025 ProcessDeclAttributes(S, NewID, D); 8026 8027 if (D.isInvalidType()) 8028 NewID->setInvalidDecl(); 8029 8030 if (II) { 8031 // FIXME: When interfaces are DeclContexts, we'll need to add 8032 // these to the interface. 8033 S->AddDecl(NewID); 8034 IdResolver.AddDecl(NewID); 8035 } 8036 8037 return NewID; 8038} 8039 8040/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8041/// class and class extensions. For every class @interface and class 8042/// extension @interface, if the last ivar is a bitfield of any type, 8043/// then add an implicit `char :0` ivar to the end of that interface. 8044void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 8045 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 8046 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8047 return; 8048 8049 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8050 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8051 8052 if (!Ivar->isBitField()) 8053 return; 8054 uint64_t BitFieldSize = 8055 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 8056 if (BitFieldSize == 0) 8057 return; 8058 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 8059 if (!ID) { 8060 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8061 if (!CD->IsClassExtension()) 8062 return; 8063 } 8064 // No need to add this to end of @implementation. 8065 else 8066 return; 8067 } 8068 // All conditions are met. Add a new bitfield to the tail end of ivars. 8069 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 8070 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 8071 8072 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 8073 DeclLoc, DeclLoc, 0, 8074 Context.CharTy, 8075 Context.CreateTypeSourceInfo(Context.CharTy), 8076 ObjCIvarDecl::Private, BW, 8077 true); 8078 AllIvarDecls.push_back(Ivar); 8079} 8080 8081void Sema::ActOnFields(Scope* S, 8082 SourceLocation RecLoc, Decl *EnclosingDecl, 8083 Decl **Fields, unsigned NumFields, 8084 SourceLocation LBrac, SourceLocation RBrac, 8085 AttributeList *Attr) { 8086 assert(EnclosingDecl && "missing record or interface decl"); 8087 8088 // If the decl this is being inserted into is invalid, then it may be a 8089 // redeclaration or some other bogus case. Don't try to add fields to it. 8090 if (EnclosingDecl->isInvalidDecl()) { 8091 // FIXME: Deallocate fields? 8092 return; 8093 } 8094 8095 8096 // Verify that all the fields are okay. 8097 unsigned NumNamedMembers = 0; 8098 llvm::SmallVector<FieldDecl*, 32> RecFields; 8099 8100 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8101 for (unsigned i = 0; i != NumFields; ++i) { 8102 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 8103 8104 // Get the type for the field. 8105 const Type *FDTy = FD->getType().getTypePtr(); 8106 8107 if (!FD->isAnonymousStructOrUnion()) { 8108 // Remember all fields written by the user. 8109 RecFields.push_back(FD); 8110 } 8111 8112 // If the field is already invalid for some reason, don't emit more 8113 // diagnostics about it. 8114 if (FD->isInvalidDecl()) { 8115 EnclosingDecl->setInvalidDecl(); 8116 continue; 8117 } 8118 8119 // C99 6.7.2.1p2: 8120 // A structure or union shall not contain a member with 8121 // incomplete or function type (hence, a structure shall not 8122 // contain an instance of itself, but may contain a pointer to 8123 // an instance of itself), except that the last member of a 8124 // structure with more than one named member may have incomplete 8125 // array type; such a structure (and any union containing, 8126 // possibly recursively, a member that is such a structure) 8127 // shall not be a member of a structure or an element of an 8128 // array. 8129 if (FDTy->isFunctionType()) { 8130 // Field declared as a function. 8131 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8132 << FD->getDeclName(); 8133 FD->setInvalidDecl(); 8134 EnclosingDecl->setInvalidDecl(); 8135 continue; 8136 } else if (FDTy->isIncompleteArrayType() && Record && 8137 ((i == NumFields - 1 && !Record->isUnion()) || 8138 ((getLangOptions().Microsoft || getLangOptions().CPlusPlus) && 8139 (i == NumFields - 1 || Record->isUnion())))) { 8140 // Flexible array member. 8141 // Microsoft and g++ is more permissive regarding flexible array. 8142 // It will accept flexible array in union and also 8143 // as the sole element of a struct/class. 8144 if (getLangOptions().Microsoft) { 8145 if (Record->isUnion()) 8146 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8147 << FD->getDeclName(); 8148 else if (NumFields == 1) 8149 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8150 << FD->getDeclName() << Record->getTagKind(); 8151 } else if (getLangOptions().CPlusPlus) { 8152 if (Record->isUnion()) 8153 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8154 << FD->getDeclName(); 8155 else if (NumFields == 1) 8156 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8157 << FD->getDeclName() << Record->getTagKind(); 8158 } else if (NumNamedMembers < 1) { 8159 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8160 << FD->getDeclName(); 8161 FD->setInvalidDecl(); 8162 EnclosingDecl->setInvalidDecl(); 8163 continue; 8164 } 8165 if (!FD->getType()->isDependentType() && 8166 !Context.getBaseElementType(FD->getType())->isPODType()) { 8167 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8168 << FD->getDeclName() << FD->getType(); 8169 FD->setInvalidDecl(); 8170 EnclosingDecl->setInvalidDecl(); 8171 continue; 8172 } 8173 // Okay, we have a legal flexible array member at the end of the struct. 8174 if (Record) 8175 Record->setHasFlexibleArrayMember(true); 8176 } else if (!FDTy->isDependentType() && 8177 RequireCompleteType(FD->getLocation(), FD->getType(), 8178 diag::err_field_incomplete)) { 8179 // Incomplete type 8180 FD->setInvalidDecl(); 8181 EnclosingDecl->setInvalidDecl(); 8182 continue; 8183 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8184 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8185 // If this is a member of a union, then entire union becomes "flexible". 8186 if (Record && Record->isUnion()) { 8187 Record->setHasFlexibleArrayMember(true); 8188 } else { 8189 // If this is a struct/class and this is not the last element, reject 8190 // it. Note that GCC supports variable sized arrays in the middle of 8191 // structures. 8192 if (i != NumFields-1) 8193 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8194 << FD->getDeclName() << FD->getType(); 8195 else { 8196 // We support flexible arrays at the end of structs in 8197 // other structs as an extension. 8198 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8199 << FD->getDeclName(); 8200 if (Record) 8201 Record->setHasFlexibleArrayMember(true); 8202 } 8203 } 8204 } 8205 if (Record && FDTTy->getDecl()->hasObjectMember()) 8206 Record->setHasObjectMember(true); 8207 } else if (FDTy->isObjCObjectType()) { 8208 /// A field cannot be an Objective-c object 8209 Diag(FD->getLocation(), diag::err_statically_allocated_object); 8210 FD->setInvalidDecl(); 8211 EnclosingDecl->setInvalidDecl(); 8212 continue; 8213 } else if (getLangOptions().ObjC1 && 8214 getLangOptions().getGCMode() != LangOptions::NonGC && 8215 Record && 8216 (FD->getType()->isObjCObjectPointerType() || 8217 FD->getType().isObjCGCStrong())) 8218 Record->setHasObjectMember(true); 8219 else if (Context.getAsArrayType(FD->getType())) { 8220 QualType BaseType = Context.getBaseElementType(FD->getType()); 8221 if (Record && BaseType->isRecordType() && 8222 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8223 Record->setHasObjectMember(true); 8224 } 8225 // Keep track of the number of named members. 8226 if (FD->getIdentifier()) 8227 ++NumNamedMembers; 8228 } 8229 8230 // Okay, we successfully defined 'Record'. 8231 if (Record) { 8232 bool Completed = false; 8233 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8234 if (!CXXRecord->isInvalidDecl()) { 8235 // Set access bits correctly on the directly-declared conversions. 8236 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8237 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8238 I != E; ++I) 8239 Convs->setAccess(I, (*I)->getAccess()); 8240 8241 if (!CXXRecord->isDependentType()) { 8242 // Adjust user-defined destructor exception spec. 8243 if (getLangOptions().CPlusPlus0x && 8244 CXXRecord->hasUserDeclaredDestructor()) 8245 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8246 8247 // Add any implicitly-declared members to this class. 8248 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8249 8250 // If we have virtual base classes, we may end up finding multiple 8251 // final overriders for a given virtual function. Check for this 8252 // problem now. 8253 if (CXXRecord->getNumVBases()) { 8254 CXXFinalOverriderMap FinalOverriders; 8255 CXXRecord->getFinalOverriders(FinalOverriders); 8256 8257 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8258 MEnd = FinalOverriders.end(); 8259 M != MEnd; ++M) { 8260 for (OverridingMethods::iterator SO = M->second.begin(), 8261 SOEnd = M->second.end(); 8262 SO != SOEnd; ++SO) { 8263 assert(SO->second.size() > 0 && 8264 "Virtual function without overridding functions?"); 8265 if (SO->second.size() == 1) 8266 continue; 8267 8268 // C++ [class.virtual]p2: 8269 // In a derived class, if a virtual member function of a base 8270 // class subobject has more than one final overrider the 8271 // program is ill-formed. 8272 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 8273 << (NamedDecl *)M->first << Record; 8274 Diag(M->first->getLocation(), 8275 diag::note_overridden_virtual_function); 8276 for (OverridingMethods::overriding_iterator 8277 OM = SO->second.begin(), 8278 OMEnd = SO->second.end(); 8279 OM != OMEnd; ++OM) 8280 Diag(OM->Method->getLocation(), diag::note_final_overrider) 8281 << (NamedDecl *)M->first << OM->Method->getParent(); 8282 8283 Record->setInvalidDecl(); 8284 } 8285 } 8286 CXXRecord->completeDefinition(&FinalOverriders); 8287 Completed = true; 8288 } 8289 } 8290 } 8291 } 8292 8293 if (!Completed) 8294 Record->completeDefinition(); 8295 8296 // Now that the record is complete, do any delayed exception spec checks 8297 // we were missing. 8298 while (!DelayedDestructorExceptionSpecChecks.empty()) { 8299 const CXXDestructorDecl *Dtor = 8300 DelayedDestructorExceptionSpecChecks.back().first; 8301 if (Dtor->getParent() != Record) 8302 break; 8303 8304 assert(!Dtor->getParent()->isDependentType() && 8305 "Should not ever add destructors of templates into the list."); 8306 CheckOverridingFunctionExceptionSpec(Dtor, 8307 DelayedDestructorExceptionSpecChecks.back().second); 8308 DelayedDestructorExceptionSpecChecks.pop_back(); 8309 } 8310 8311 } else { 8312 ObjCIvarDecl **ClsFields = 8313 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 8314 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 8315 ID->setLocEnd(RBrac); 8316 // Add ivar's to class's DeclContext. 8317 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8318 ClsFields[i]->setLexicalDeclContext(ID); 8319 ID->addDecl(ClsFields[i]); 8320 } 8321 // Must enforce the rule that ivars in the base classes may not be 8322 // duplicates. 8323 if (ID->getSuperClass()) 8324 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 8325 } else if (ObjCImplementationDecl *IMPDecl = 8326 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8327 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 8328 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 8329 // Ivar declared in @implementation never belongs to the implementation. 8330 // Only it is in implementation's lexical context. 8331 ClsFields[I]->setLexicalDeclContext(IMPDecl); 8332 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 8333 } else if (ObjCCategoryDecl *CDecl = 8334 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8335 // case of ivars in class extension; all other cases have been 8336 // reported as errors elsewhere. 8337 // FIXME. Class extension does not have a LocEnd field. 8338 // CDecl->setLocEnd(RBrac); 8339 // Add ivar's to class extension's DeclContext. 8340 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8341 ClsFields[i]->setLexicalDeclContext(CDecl); 8342 CDecl->addDecl(ClsFields[i]); 8343 } 8344 } 8345 } 8346 8347 if (Attr) 8348 ProcessDeclAttributeList(S, Record, Attr); 8349 8350 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 8351 // set the visibility of this record. 8352 if (Record && !Record->getDeclContext()->isRecord()) 8353 AddPushedVisibilityAttribute(Record); 8354} 8355 8356/// \brief Determine whether the given integral value is representable within 8357/// the given type T. 8358static bool isRepresentableIntegerValue(ASTContext &Context, 8359 llvm::APSInt &Value, 8360 QualType T) { 8361 assert(T->isIntegralType(Context) && "Integral type required!"); 8362 unsigned BitWidth = Context.getIntWidth(T); 8363 8364 if (Value.isUnsigned() || Value.isNonNegative()) { 8365 if (T->isSignedIntegerOrEnumerationType()) 8366 --BitWidth; 8367 return Value.getActiveBits() <= BitWidth; 8368 } 8369 return Value.getMinSignedBits() <= BitWidth; 8370} 8371 8372// \brief Given an integral type, return the next larger integral type 8373// (or a NULL type of no such type exists). 8374static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 8375 // FIXME: Int128/UInt128 support, which also needs to be introduced into 8376 // enum checking below. 8377 assert(T->isIntegralType(Context) && "Integral type required!"); 8378 const unsigned NumTypes = 4; 8379 QualType SignedIntegralTypes[NumTypes] = { 8380 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 8381 }; 8382 QualType UnsignedIntegralTypes[NumTypes] = { 8383 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 8384 Context.UnsignedLongLongTy 8385 }; 8386 8387 unsigned BitWidth = Context.getTypeSize(T); 8388 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 8389 : UnsignedIntegralTypes; 8390 for (unsigned I = 0; I != NumTypes; ++I) 8391 if (Context.getTypeSize(Types[I]) > BitWidth) 8392 return Types[I]; 8393 8394 return QualType(); 8395} 8396 8397EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 8398 EnumConstantDecl *LastEnumConst, 8399 SourceLocation IdLoc, 8400 IdentifierInfo *Id, 8401 Expr *Val) { 8402 unsigned IntWidth = Context.Target.getIntWidth(); 8403 llvm::APSInt EnumVal(IntWidth); 8404 QualType EltTy; 8405 8406 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 8407 Val = 0; 8408 8409 if (Val) { 8410 if (Enum->isDependentType() || Val->isTypeDependent()) 8411 EltTy = Context.DependentTy; 8412 else { 8413 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 8414 SourceLocation ExpLoc; 8415 if (!Val->isValueDependent() && 8416 VerifyIntegerConstantExpression(Val, &EnumVal)) { 8417 Val = 0; 8418 } else { 8419 if (!getLangOptions().CPlusPlus) { 8420 // C99 6.7.2.2p2: 8421 // The expression that defines the value of an enumeration constant 8422 // shall be an integer constant expression that has a value 8423 // representable as an int. 8424 8425 // Complain if the value is not representable in an int. 8426 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 8427 Diag(IdLoc, diag::ext_enum_value_not_int) 8428 << EnumVal.toString(10) << Val->getSourceRange() 8429 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 8430 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 8431 // Force the type of the expression to 'int'. 8432 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 8433 } 8434 } 8435 8436 if (Enum->isFixed()) { 8437 EltTy = Enum->getIntegerType(); 8438 8439 // C++0x [dcl.enum]p5: 8440 // ... if the initializing value of an enumerator cannot be 8441 // represented by the underlying type, the program is ill-formed. 8442 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8443 if (getLangOptions().Microsoft) { 8444 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 8445 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8446 } else 8447 Diag(IdLoc, diag::err_enumerator_too_large) 8448 << EltTy; 8449 } else 8450 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8451 } 8452 else { 8453 // C++0x [dcl.enum]p5: 8454 // If the underlying type is not fixed, the type of each enumerator 8455 // is the type of its initializing value: 8456 // - If an initializer is specified for an enumerator, the 8457 // initializing value has the same type as the expression. 8458 EltTy = Val->getType(); 8459 } 8460 } 8461 } 8462 } 8463 8464 if (!Val) { 8465 if (Enum->isDependentType()) 8466 EltTy = Context.DependentTy; 8467 else if (!LastEnumConst) { 8468 // C++0x [dcl.enum]p5: 8469 // If the underlying type is not fixed, the type of each enumerator 8470 // is the type of its initializing value: 8471 // - If no initializer is specified for the first enumerator, the 8472 // initializing value has an unspecified integral type. 8473 // 8474 // GCC uses 'int' for its unspecified integral type, as does 8475 // C99 6.7.2.2p3. 8476 if (Enum->isFixed()) { 8477 EltTy = Enum->getIntegerType(); 8478 } 8479 else { 8480 EltTy = Context.IntTy; 8481 } 8482 } else { 8483 // Assign the last value + 1. 8484 EnumVal = LastEnumConst->getInitVal(); 8485 ++EnumVal; 8486 EltTy = LastEnumConst->getType(); 8487 8488 // Check for overflow on increment. 8489 if (EnumVal < LastEnumConst->getInitVal()) { 8490 // C++0x [dcl.enum]p5: 8491 // If the underlying type is not fixed, the type of each enumerator 8492 // is the type of its initializing value: 8493 // 8494 // - Otherwise the type of the initializing value is the same as 8495 // the type of the initializing value of the preceding enumerator 8496 // unless the incremented value is not representable in that type, 8497 // in which case the type is an unspecified integral type 8498 // sufficient to contain the incremented value. If no such type 8499 // exists, the program is ill-formed. 8500 QualType T = getNextLargerIntegralType(Context, EltTy); 8501 if (T.isNull() || Enum->isFixed()) { 8502 // There is no integral type larger enough to represent this 8503 // value. Complain, then allow the value to wrap around. 8504 EnumVal = LastEnumConst->getInitVal(); 8505 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 8506 ++EnumVal; 8507 if (Enum->isFixed()) 8508 // When the underlying type is fixed, this is ill-formed. 8509 Diag(IdLoc, diag::err_enumerator_wrapped) 8510 << EnumVal.toString(10) 8511 << EltTy; 8512 else 8513 Diag(IdLoc, diag::warn_enumerator_too_large) 8514 << EnumVal.toString(10); 8515 } else { 8516 EltTy = T; 8517 } 8518 8519 // Retrieve the last enumerator's value, extent that type to the 8520 // type that is supposed to be large enough to represent the incremented 8521 // value, then increment. 8522 EnumVal = LastEnumConst->getInitVal(); 8523 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 8524 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8525 ++EnumVal; 8526 8527 // If we're not in C++, diagnose the overflow of enumerator values, 8528 // which in C99 means that the enumerator value is not representable in 8529 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 8530 // permits enumerator values that are representable in some larger 8531 // integral type. 8532 if (!getLangOptions().CPlusPlus && !T.isNull()) 8533 Diag(IdLoc, diag::warn_enum_value_overflow); 8534 } else if (!getLangOptions().CPlusPlus && 8535 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8536 // Enforce C99 6.7.2.2p2 even when we compute the next value. 8537 Diag(IdLoc, diag::ext_enum_value_not_int) 8538 << EnumVal.toString(10) << 1; 8539 } 8540 } 8541 } 8542 8543 if (!EltTy->isDependentType()) { 8544 // Make the enumerator value match the signedness and size of the 8545 // enumerator's type. 8546 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8547 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 8548 } 8549 8550 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 8551 Val, EnumVal); 8552} 8553 8554 8555Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 8556 SourceLocation IdLoc, IdentifierInfo *Id, 8557 AttributeList *Attr, 8558 SourceLocation EqualLoc, ExprTy *val) { 8559 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 8560 EnumConstantDecl *LastEnumConst = 8561 cast_or_null<EnumConstantDecl>(lastEnumConst); 8562 Expr *Val = static_cast<Expr*>(val); 8563 8564 // The scope passed in may not be a decl scope. Zip up the scope tree until 8565 // we find one that is. 8566 S = getNonFieldDeclScope(S); 8567 8568 // Verify that there isn't already something declared with this name in this 8569 // scope. 8570 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 8571 ForRedeclaration); 8572 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8573 // Maybe we will complain about the shadowed template parameter. 8574 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 8575 // Just pretend that we didn't see the previous declaration. 8576 PrevDecl = 0; 8577 } 8578 8579 if (PrevDecl) { 8580 // When in C++, we may get a TagDecl with the same name; in this case the 8581 // enum constant will 'hide' the tag. 8582 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 8583 "Received TagDecl when not in C++!"); 8584 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 8585 if (isa<EnumConstantDecl>(PrevDecl)) 8586 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 8587 else 8588 Diag(IdLoc, diag::err_redefinition) << Id; 8589 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8590 return 0; 8591 } 8592 } 8593 8594 // C++ [class.mem]p13: 8595 // If T is the name of a class, then each of the following shall have a 8596 // name different from T: 8597 // - every enumerator of every member of class T that is an enumerated 8598 // type 8599 if (CXXRecordDecl *Record 8600 = dyn_cast<CXXRecordDecl>( 8601 TheEnumDecl->getDeclContext()->getRedeclContext())) 8602 if (Record->getIdentifier() && Record->getIdentifier() == Id) 8603 Diag(IdLoc, diag::err_member_name_of_class) << Id; 8604 8605 EnumConstantDecl *New = 8606 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 8607 8608 if (New) { 8609 // Process attributes. 8610 if (Attr) ProcessDeclAttributeList(S, New, Attr); 8611 8612 // Register this decl in the current scope stack. 8613 New->setAccess(TheEnumDecl->getAccess()); 8614 PushOnScopeChains(New, S); 8615 } 8616 8617 return New; 8618} 8619 8620void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 8621 SourceLocation RBraceLoc, Decl *EnumDeclX, 8622 Decl **Elements, unsigned NumElements, 8623 Scope *S, AttributeList *Attr) { 8624 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 8625 QualType EnumType = Context.getTypeDeclType(Enum); 8626 8627 if (Attr) 8628 ProcessDeclAttributeList(S, Enum, Attr); 8629 8630 if (Enum->isDependentType()) { 8631 for (unsigned i = 0; i != NumElements; ++i) { 8632 EnumConstantDecl *ECD = 8633 cast_or_null<EnumConstantDecl>(Elements[i]); 8634 if (!ECD) continue; 8635 8636 ECD->setType(EnumType); 8637 } 8638 8639 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 8640 return; 8641 } 8642 8643 // TODO: If the result value doesn't fit in an int, it must be a long or long 8644 // long value. ISO C does not support this, but GCC does as an extension, 8645 // emit a warning. 8646 unsigned IntWidth = Context.Target.getIntWidth(); 8647 unsigned CharWidth = Context.Target.getCharWidth(); 8648 unsigned ShortWidth = Context.Target.getShortWidth(); 8649 8650 // Verify that all the values are okay, compute the size of the values, and 8651 // reverse the list. 8652 unsigned NumNegativeBits = 0; 8653 unsigned NumPositiveBits = 0; 8654 8655 // Keep track of whether all elements have type int. 8656 bool AllElementsInt = true; 8657 8658 for (unsigned i = 0; i != NumElements; ++i) { 8659 EnumConstantDecl *ECD = 8660 cast_or_null<EnumConstantDecl>(Elements[i]); 8661 if (!ECD) continue; // Already issued a diagnostic. 8662 8663 const llvm::APSInt &InitVal = ECD->getInitVal(); 8664 8665 // Keep track of the size of positive and negative values. 8666 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 8667 NumPositiveBits = std::max(NumPositiveBits, 8668 (unsigned)InitVal.getActiveBits()); 8669 else 8670 NumNegativeBits = std::max(NumNegativeBits, 8671 (unsigned)InitVal.getMinSignedBits()); 8672 8673 // Keep track of whether every enum element has type int (very commmon). 8674 if (AllElementsInt) 8675 AllElementsInt = ECD->getType() == Context.IntTy; 8676 } 8677 8678 // Figure out the type that should be used for this enum. 8679 QualType BestType; 8680 unsigned BestWidth; 8681 8682 // C++0x N3000 [conv.prom]p3: 8683 // An rvalue of an unscoped enumeration type whose underlying 8684 // type is not fixed can be converted to an rvalue of the first 8685 // of the following types that can represent all the values of 8686 // the enumeration: int, unsigned int, long int, unsigned long 8687 // int, long long int, or unsigned long long int. 8688 // C99 6.4.4.3p2: 8689 // An identifier declared as an enumeration constant has type int. 8690 // The C99 rule is modified by a gcc extension 8691 QualType BestPromotionType; 8692 8693 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 8694 // -fshort-enums is the equivalent to specifying the packed attribute on all 8695 // enum definitions. 8696 if (LangOpts.ShortEnums) 8697 Packed = true; 8698 8699 if (Enum->isFixed()) { 8700 BestType = BestPromotionType = Enum->getIntegerType(); 8701 // We don't need to set BestWidth, because BestType is going to be the type 8702 // of the enumerators, but we do anyway because otherwise some compilers 8703 // warn that it might be used uninitialized. 8704 BestWidth = CharWidth; 8705 } 8706 else if (NumNegativeBits) { 8707 // If there is a negative value, figure out the smallest integer type (of 8708 // int/long/longlong) that fits. 8709 // If it's packed, check also if it fits a char or a short. 8710 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 8711 BestType = Context.SignedCharTy; 8712 BestWidth = CharWidth; 8713 } else if (Packed && NumNegativeBits <= ShortWidth && 8714 NumPositiveBits < ShortWidth) { 8715 BestType = Context.ShortTy; 8716 BestWidth = ShortWidth; 8717 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 8718 BestType = Context.IntTy; 8719 BestWidth = IntWidth; 8720 } else { 8721 BestWidth = Context.Target.getLongWidth(); 8722 8723 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 8724 BestType = Context.LongTy; 8725 } else { 8726 BestWidth = Context.Target.getLongLongWidth(); 8727 8728 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 8729 Diag(Enum->getLocation(), diag::warn_enum_too_large); 8730 BestType = Context.LongLongTy; 8731 } 8732 } 8733 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 8734 } else { 8735 // If there is no negative value, figure out the smallest type that fits 8736 // all of the enumerator values. 8737 // If it's packed, check also if it fits a char or a short. 8738 if (Packed && NumPositiveBits <= CharWidth) { 8739 BestType = Context.UnsignedCharTy; 8740 BestPromotionType = Context.IntTy; 8741 BestWidth = CharWidth; 8742 } else if (Packed && NumPositiveBits <= ShortWidth) { 8743 BestType = Context.UnsignedShortTy; 8744 BestPromotionType = Context.IntTy; 8745 BestWidth = ShortWidth; 8746 } else if (NumPositiveBits <= IntWidth) { 8747 BestType = Context.UnsignedIntTy; 8748 BestWidth = IntWidth; 8749 BestPromotionType 8750 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8751 ? Context.UnsignedIntTy : Context.IntTy; 8752 } else if (NumPositiveBits <= 8753 (BestWidth = Context.Target.getLongWidth())) { 8754 BestType = Context.UnsignedLongTy; 8755 BestPromotionType 8756 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8757 ? Context.UnsignedLongTy : Context.LongTy; 8758 } else { 8759 BestWidth = Context.Target.getLongLongWidth(); 8760 assert(NumPositiveBits <= BestWidth && 8761 "How could an initializer get larger than ULL?"); 8762 BestType = Context.UnsignedLongLongTy; 8763 BestPromotionType 8764 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8765 ? Context.UnsignedLongLongTy : Context.LongLongTy; 8766 } 8767 } 8768 8769 // Loop over all of the enumerator constants, changing their types to match 8770 // the type of the enum if needed. 8771 for (unsigned i = 0; i != NumElements; ++i) { 8772 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 8773 if (!ECD) continue; // Already issued a diagnostic. 8774 8775 // Standard C says the enumerators have int type, but we allow, as an 8776 // extension, the enumerators to be larger than int size. If each 8777 // enumerator value fits in an int, type it as an int, otherwise type it the 8778 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 8779 // that X has type 'int', not 'unsigned'. 8780 8781 // Determine whether the value fits into an int. 8782 llvm::APSInt InitVal = ECD->getInitVal(); 8783 8784 // If it fits into an integer type, force it. Otherwise force it to match 8785 // the enum decl type. 8786 QualType NewTy; 8787 unsigned NewWidth; 8788 bool NewSign; 8789 if (!getLangOptions().CPlusPlus && 8790 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 8791 NewTy = Context.IntTy; 8792 NewWidth = IntWidth; 8793 NewSign = true; 8794 } else if (ECD->getType() == BestType) { 8795 // Already the right type! 8796 if (getLangOptions().CPlusPlus) 8797 // C++ [dcl.enum]p4: Following the closing brace of an 8798 // enum-specifier, each enumerator has the type of its 8799 // enumeration. 8800 ECD->setType(EnumType); 8801 continue; 8802 } else { 8803 NewTy = BestType; 8804 NewWidth = BestWidth; 8805 NewSign = BestType->isSignedIntegerOrEnumerationType(); 8806 } 8807 8808 // Adjust the APSInt value. 8809 InitVal = InitVal.extOrTrunc(NewWidth); 8810 InitVal.setIsSigned(NewSign); 8811 ECD->setInitVal(InitVal); 8812 8813 // Adjust the Expr initializer and type. 8814 if (ECD->getInitExpr() && 8815 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 8816 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 8817 CK_IntegralCast, 8818 ECD->getInitExpr(), 8819 /*base paths*/ 0, 8820 VK_RValue)); 8821 if (getLangOptions().CPlusPlus) 8822 // C++ [dcl.enum]p4: Following the closing brace of an 8823 // enum-specifier, each enumerator has the type of its 8824 // enumeration. 8825 ECD->setType(EnumType); 8826 else 8827 ECD->setType(NewTy); 8828 } 8829 8830 Enum->completeDefinition(BestType, BestPromotionType, 8831 NumPositiveBits, NumNegativeBits); 8832} 8833 8834Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 8835 SourceLocation StartLoc, 8836 SourceLocation EndLoc) { 8837 StringLiteral *AsmString = cast<StringLiteral>(expr); 8838 8839 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 8840 AsmString, StartLoc, 8841 EndLoc); 8842 CurContext->addDecl(New); 8843 return New; 8844} 8845 8846void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 8847 SourceLocation PragmaLoc, 8848 SourceLocation NameLoc) { 8849 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 8850 8851 if (PrevDecl) { 8852 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 8853 } else { 8854 (void)WeakUndeclaredIdentifiers.insert( 8855 std::pair<IdentifierInfo*,WeakInfo> 8856 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 8857 } 8858} 8859 8860void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 8861 IdentifierInfo* AliasName, 8862 SourceLocation PragmaLoc, 8863 SourceLocation NameLoc, 8864 SourceLocation AliasNameLoc) { 8865 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 8866 LookupOrdinaryName); 8867 WeakInfo W = WeakInfo(Name, NameLoc); 8868 8869 if (PrevDecl) { 8870 if (!PrevDecl->hasAttr<AliasAttr>()) 8871 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 8872 DeclApplyPragmaWeak(TUScope, ND, W); 8873 } else { 8874 (void)WeakUndeclaredIdentifiers.insert( 8875 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 8876 } 8877} 8878