SemaDecl.cpp revision 717a20b9cebb0d261b74995f8ebf3a1c814bbc08
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/APValue.h" 22#include "clang/AST/ASTConsumer.h" 23#include "clang/AST/ASTContext.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/EvaluatedExprVisitor.h" 29#include "clang/AST/ExprCXX.h" 30#include "clang/AST/StmtCXX.h" 31#include "clang/AST/CharUnits.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Parse/ParseDiagnostic.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "clang/Lex/ModuleLoader.h" 42#include "llvm/ADT/Triple.h" 43#include <algorithm> 44#include <cstring> 45#include <functional> 46using namespace clang; 47using namespace sema; 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 50 if (OwnedType) { 51 Decl *Group[2] = { OwnedType, Ptr }; 52 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 53 } 54 55 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 56} 57 58/// \brief If the identifier refers to a type name within this scope, 59/// return the declaration of that type. 60/// 61/// This routine performs ordinary name lookup of the identifier II 62/// within the given scope, with optional C++ scope specifier SS, to 63/// determine whether the name refers to a type. If so, returns an 64/// opaque pointer (actually a QualType) corresponding to that 65/// type. Otherwise, returns NULL. 66/// 67/// If name lookup results in an ambiguity, this routine will complain 68/// and then return NULL. 69ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 70 Scope *S, CXXScopeSpec *SS, 71 bool isClassName, bool HasTrailingDot, 72 ParsedType ObjectTypePtr, 73 bool WantNontrivialTypeSourceInfo) { 74 // Determine where we will perform name lookup. 75 DeclContext *LookupCtx = 0; 76 if (ObjectTypePtr) { 77 QualType ObjectType = ObjectTypePtr.get(); 78 if (ObjectType->isRecordType()) 79 LookupCtx = computeDeclContext(ObjectType); 80 } else if (SS && SS->isNotEmpty()) { 81 LookupCtx = computeDeclContext(*SS, false); 82 83 if (!LookupCtx) { 84 if (isDependentScopeSpecifier(*SS)) { 85 // C++ [temp.res]p3: 86 // A qualified-id that refers to a type and in which the 87 // nested-name-specifier depends on a template-parameter (14.6.2) 88 // shall be prefixed by the keyword typename to indicate that the 89 // qualified-id denotes a type, forming an 90 // elaborated-type-specifier (7.1.5.3). 91 // 92 // We therefore do not perform any name lookup if the result would 93 // refer to a member of an unknown specialization. 94 if (!isClassName) 95 return ParsedType(); 96 97 // We know from the grammar that this name refers to a type, 98 // so build a dependent node to describe the type. 99 if (WantNontrivialTypeSourceInfo) 100 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 101 102 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 103 QualType T = 104 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 105 II, NameLoc); 106 107 return ParsedType::make(T); 108 } 109 110 return ParsedType(); 111 } 112 113 if (!LookupCtx->isDependentContext() && 114 RequireCompleteDeclContext(*SS, LookupCtx)) 115 return ParsedType(); 116 } 117 118 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 119 // lookup for class-names. 120 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 121 LookupOrdinaryName; 122 LookupResult Result(*this, &II, NameLoc, Kind); 123 if (LookupCtx) { 124 // Perform "qualified" name lookup into the declaration context we 125 // computed, which is either the type of the base of a member access 126 // expression or the declaration context associated with a prior 127 // nested-name-specifier. 128 LookupQualifiedName(Result, LookupCtx); 129 130 if (ObjectTypePtr && Result.empty()) { 131 // C++ [basic.lookup.classref]p3: 132 // If the unqualified-id is ~type-name, the type-name is looked up 133 // in the context of the entire postfix-expression. If the type T of 134 // the object expression is of a class type C, the type-name is also 135 // looked up in the scope of class C. At least one of the lookups shall 136 // find a name that refers to (possibly cv-qualified) T. 137 LookupName(Result, S); 138 } 139 } else { 140 // Perform unqualified name lookup. 141 LookupName(Result, S); 142 } 143 144 NamedDecl *IIDecl = 0; 145 switch (Result.getResultKind()) { 146 case LookupResult::NotFound: 147 case LookupResult::NotFoundInCurrentInstantiation: 148 case LookupResult::FoundOverloaded: 149 case LookupResult::FoundUnresolvedValue: 150 Result.suppressDiagnostics(); 151 return ParsedType(); 152 153 case LookupResult::Ambiguous: 154 // Recover from type-hiding ambiguities by hiding the type. We'll 155 // do the lookup again when looking for an object, and we can 156 // diagnose the error then. If we don't do this, then the error 157 // about hiding the type will be immediately followed by an error 158 // that only makes sense if the identifier was treated like a type. 159 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 160 Result.suppressDiagnostics(); 161 return ParsedType(); 162 } 163 164 // Look to see if we have a type anywhere in the list of results. 165 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 166 Res != ResEnd; ++Res) { 167 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 168 if (!IIDecl || 169 (*Res)->getLocation().getRawEncoding() < 170 IIDecl->getLocation().getRawEncoding()) 171 IIDecl = *Res; 172 } 173 } 174 175 if (!IIDecl) { 176 // None of the entities we found is a type, so there is no way 177 // to even assume that the result is a type. In this case, don't 178 // complain about the ambiguity. The parser will either try to 179 // perform this lookup again (e.g., as an object name), which 180 // will produce the ambiguity, or will complain that it expected 181 // a type name. 182 Result.suppressDiagnostics(); 183 return ParsedType(); 184 } 185 186 // We found a type within the ambiguous lookup; diagnose the 187 // ambiguity and then return that type. This might be the right 188 // answer, or it might not be, but it suppresses any attempt to 189 // perform the name lookup again. 190 break; 191 192 case LookupResult::Found: 193 IIDecl = Result.getFoundDecl(); 194 break; 195 } 196 197 assert(IIDecl && "Didn't find decl"); 198 199 QualType T; 200 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 201 DiagnoseUseOfDecl(IIDecl, NameLoc); 202 203 if (T.isNull()) 204 T = Context.getTypeDeclType(TD); 205 206 if (SS && SS->isNotEmpty()) { 207 if (WantNontrivialTypeSourceInfo) { 208 // Construct a type with type-source information. 209 TypeLocBuilder Builder; 210 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 211 212 T = getElaboratedType(ETK_None, *SS, T); 213 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 214 ElabTL.setKeywordLoc(SourceLocation()); 215 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 216 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 217 } else { 218 T = getElaboratedType(ETK_None, *SS, T); 219 } 220 } 221 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 222 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 223 if (!HasTrailingDot) 224 T = Context.getObjCInterfaceType(IDecl); 225 } 226 227 if (T.isNull()) { 228 // If it's not plausibly a type, suppress diagnostics. 229 Result.suppressDiagnostics(); 230 return ParsedType(); 231 } 232 return ParsedType::make(T); 233} 234 235/// isTagName() - This method is called *for error recovery purposes only* 236/// to determine if the specified name is a valid tag name ("struct foo"). If 237/// so, this returns the TST for the tag corresponding to it (TST_enum, 238/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 239/// where the user forgot to specify the tag. 240DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 241 // Do a tag name lookup in this scope. 242 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 243 LookupName(R, S, false); 244 R.suppressDiagnostics(); 245 if (R.getResultKind() == LookupResult::Found) 246 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 247 switch (TD->getTagKind()) { 248 default: return DeclSpec::TST_unspecified; 249 case TTK_Struct: return DeclSpec::TST_struct; 250 case TTK_Union: return DeclSpec::TST_union; 251 case TTK_Class: return DeclSpec::TST_class; 252 case TTK_Enum: return DeclSpec::TST_enum; 253 } 254 } 255 256 return DeclSpec::TST_unspecified; 257} 258 259/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 260/// if a CXXScopeSpec's type is equal to the type of one of the base classes 261/// then downgrade the missing typename error to a warning. 262/// This is needed for MSVC compatibility; Example: 263/// @code 264/// template<class T> class A { 265/// public: 266/// typedef int TYPE; 267/// }; 268/// template<class T> class B : public A<T> { 269/// public: 270/// A<T>::TYPE a; // no typename required because A<T> is a base class. 271/// }; 272/// @endcode 273bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 274 if (CurContext->isRecord()) { 275 const Type *Ty = SS->getScopeRep()->getAsType(); 276 277 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 278 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 279 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 280 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 281 return true; 282 } 283 return CurContext->isFunctionOrMethod(); 284} 285 286bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 287 SourceLocation IILoc, 288 Scope *S, 289 CXXScopeSpec *SS, 290 ParsedType &SuggestedType) { 291 // We don't have anything to suggest (yet). 292 SuggestedType = ParsedType(); 293 294 // There may have been a typo in the name of the type. Look up typo 295 // results, in case we have something that we can suggest. 296 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 297 LookupOrdinaryName, S, SS, NULL, 298 false, CTC_Type)) { 299 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 300 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 301 302 if (Corrected.isKeyword()) { 303 // We corrected to a keyword. 304 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 305 Diag(IILoc, diag::err_unknown_typename_suggest) 306 << &II << CorrectedQuotedStr; 307 return true; 308 } else { 309 NamedDecl *Result = Corrected.getCorrectionDecl(); 310 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 311 !Result->isInvalidDecl()) { 312 // We found a similarly-named type or interface; suggest that. 313 if (!SS || !SS->isSet()) 314 Diag(IILoc, diag::err_unknown_typename_suggest) 315 << &II << CorrectedQuotedStr 316 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 317 else if (DeclContext *DC = computeDeclContext(*SS, false)) 318 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 319 << &II << DC << CorrectedQuotedStr << SS->getRange() 320 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 321 else 322 llvm_unreachable("could not have corrected a typo here"); 323 324 Diag(Result->getLocation(), diag::note_previous_decl) 325 << CorrectedQuotedStr; 326 327 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 328 false, false, ParsedType(), 329 /*NonTrivialTypeSourceInfo=*/true); 330 return true; 331 } 332 } 333 } 334 335 if (getLangOptions().CPlusPlus) { 336 // See if II is a class template that the user forgot to pass arguments to. 337 UnqualifiedId Name; 338 Name.setIdentifier(&II, IILoc); 339 CXXScopeSpec EmptySS; 340 TemplateTy TemplateResult; 341 bool MemberOfUnknownSpecialization; 342 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 343 Name, ParsedType(), true, TemplateResult, 344 MemberOfUnknownSpecialization) == TNK_Type_template) { 345 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 346 Diag(IILoc, diag::err_template_missing_args) << TplName; 347 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 348 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 349 << TplDecl->getTemplateParameters()->getSourceRange(); 350 } 351 return true; 352 } 353 } 354 355 // FIXME: Should we move the logic that tries to recover from a missing tag 356 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 357 358 if (!SS || (!SS->isSet() && !SS->isInvalid())) 359 Diag(IILoc, diag::err_unknown_typename) << &II; 360 else if (DeclContext *DC = computeDeclContext(*SS, false)) 361 Diag(IILoc, diag::err_typename_nested_not_found) 362 << &II << DC << SS->getRange(); 363 else if (isDependentScopeSpecifier(*SS)) { 364 unsigned DiagID = diag::err_typename_missing; 365 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS)) 366 DiagID = diag::warn_typename_missing; 367 368 Diag(SS->getRange().getBegin(), DiagID) 369 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 370 << SourceRange(SS->getRange().getBegin(), IILoc) 371 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 372 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 373 } else { 374 assert(SS && SS->isInvalid() && 375 "Invalid scope specifier has already been diagnosed"); 376 } 377 378 return true; 379} 380 381/// \brief Determine whether the given result set contains either a type name 382/// or 383static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 384 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 385 NextToken.is(tok::less); 386 387 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 388 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 389 return true; 390 391 if (CheckTemplate && isa<TemplateDecl>(*I)) 392 return true; 393 } 394 395 return false; 396} 397 398Sema::NameClassification Sema::ClassifyName(Scope *S, 399 CXXScopeSpec &SS, 400 IdentifierInfo *&Name, 401 SourceLocation NameLoc, 402 const Token &NextToken) { 403 DeclarationNameInfo NameInfo(Name, NameLoc); 404 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 405 406 if (NextToken.is(tok::coloncolon)) { 407 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 408 QualType(), false, SS, 0, false); 409 410 } 411 412 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 413 LookupParsedName(Result, S, &SS, !CurMethod); 414 415 // Perform lookup for Objective-C instance variables (including automatically 416 // synthesized instance variables), if we're in an Objective-C method. 417 // FIXME: This lookup really, really needs to be folded in to the normal 418 // unqualified lookup mechanism. 419 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 420 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 421 if (E.get() || E.isInvalid()) 422 return E; 423 } 424 425 bool SecondTry = false; 426 bool IsFilteredTemplateName = false; 427 428Corrected: 429 switch (Result.getResultKind()) { 430 case LookupResult::NotFound: 431 // If an unqualified-id is followed by a '(', then we have a function 432 // call. 433 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 434 // In C++, this is an ADL-only call. 435 // FIXME: Reference? 436 if (getLangOptions().CPlusPlus) 437 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 438 439 // C90 6.3.2.2: 440 // If the expression that precedes the parenthesized argument list in a 441 // function call consists solely of an identifier, and if no 442 // declaration is visible for this identifier, the identifier is 443 // implicitly declared exactly as if, in the innermost block containing 444 // the function call, the declaration 445 // 446 // extern int identifier (); 447 // 448 // appeared. 449 // 450 // We also allow this in C99 as an extension. 451 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 452 Result.addDecl(D); 453 Result.resolveKind(); 454 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 455 } 456 } 457 458 // In C, we first see whether there is a tag type by the same name, in 459 // which case it's likely that the user just forget to write "enum", 460 // "struct", or "union". 461 if (!getLangOptions().CPlusPlus && !SecondTry) { 462 Result.clear(LookupTagName); 463 LookupParsedName(Result, S, &SS); 464 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 465 const char *TagName = 0; 466 const char *FixItTagName = 0; 467 switch (Tag->getTagKind()) { 468 case TTK_Class: 469 TagName = "class"; 470 FixItTagName = "class "; 471 break; 472 473 case TTK_Enum: 474 TagName = "enum"; 475 FixItTagName = "enum "; 476 break; 477 478 case TTK_Struct: 479 TagName = "struct"; 480 FixItTagName = "struct "; 481 break; 482 483 case TTK_Union: 484 TagName = "union"; 485 FixItTagName = "union "; 486 break; 487 } 488 489 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 490 << Name << TagName << getLangOptions().CPlusPlus 491 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 492 break; 493 } 494 495 Result.clear(LookupOrdinaryName); 496 } 497 498 // Perform typo correction to determine if there is another name that is 499 // close to this name. 500 if (!SecondTry) { 501 SecondTry = true; 502 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 503 Result.getLookupKind(), S, &SS)) { 504 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 505 unsigned QualifiedDiag = diag::err_no_member_suggest; 506 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 507 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 508 509 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 510 NamedDecl *UnderlyingFirstDecl 511 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 512 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 513 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 514 UnqualifiedDiag = diag::err_no_template_suggest; 515 QualifiedDiag = diag::err_no_member_template_suggest; 516 } else if (UnderlyingFirstDecl && 517 (isa<TypeDecl>(UnderlyingFirstDecl) || 518 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 519 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 520 UnqualifiedDiag = diag::err_unknown_typename_suggest; 521 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 522 } 523 524 if (SS.isEmpty()) 525 Diag(NameLoc, UnqualifiedDiag) 526 << Name << CorrectedQuotedStr 527 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 528 else 529 Diag(NameLoc, QualifiedDiag) 530 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 531 << SS.getRange() 532 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 533 534 // Update the name, so that the caller has the new name. 535 Name = Corrected.getCorrectionAsIdentifierInfo(); 536 537 // Also update the LookupResult... 538 // FIXME: This should probably go away at some point 539 Result.clear(); 540 Result.setLookupName(Corrected.getCorrection()); 541 if (FirstDecl) Result.addDecl(FirstDecl); 542 543 // Typo correction corrected to a keyword. 544 if (Corrected.isKeyword()) 545 return Corrected.getCorrectionAsIdentifierInfo(); 546 547 if (FirstDecl) 548 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 549 << CorrectedQuotedStr; 550 551 // If we found an Objective-C instance variable, let 552 // LookupInObjCMethod build the appropriate expression to 553 // reference the ivar. 554 // FIXME: This is a gross hack. 555 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 556 Result.clear(); 557 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 558 return move(E); 559 } 560 561 goto Corrected; 562 } 563 } 564 565 // We failed to correct; just fall through and let the parser deal with it. 566 Result.suppressDiagnostics(); 567 return NameClassification::Unknown(); 568 569 case LookupResult::NotFoundInCurrentInstantiation: 570 // We performed name lookup into the current instantiation, and there were 571 // dependent bases, so we treat this result the same way as any other 572 // dependent nested-name-specifier. 573 574 // C++ [temp.res]p2: 575 // A name used in a template declaration or definition and that is 576 // dependent on a template-parameter is assumed not to name a type 577 // unless the applicable name lookup finds a type name or the name is 578 // qualified by the keyword typename. 579 // 580 // FIXME: If the next token is '<', we might want to ask the parser to 581 // perform some heroics to see if we actually have a 582 // template-argument-list, which would indicate a missing 'template' 583 // keyword here. 584 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 585 586 case LookupResult::Found: 587 case LookupResult::FoundOverloaded: 588 case LookupResult::FoundUnresolvedValue: 589 break; 590 591 case LookupResult::Ambiguous: 592 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 593 hasAnyAcceptableTemplateNames(Result)) { 594 // C++ [temp.local]p3: 595 // A lookup that finds an injected-class-name (10.2) can result in an 596 // ambiguity in certain cases (for example, if it is found in more than 597 // one base class). If all of the injected-class-names that are found 598 // refer to specializations of the same class template, and if the name 599 // is followed by a template-argument-list, the reference refers to the 600 // class template itself and not a specialization thereof, and is not 601 // ambiguous. 602 // 603 // This filtering can make an ambiguous result into an unambiguous one, 604 // so try again after filtering out template names. 605 FilterAcceptableTemplateNames(Result); 606 if (!Result.isAmbiguous()) { 607 IsFilteredTemplateName = true; 608 break; 609 } 610 } 611 612 // Diagnose the ambiguity and return an error. 613 return NameClassification::Error(); 614 } 615 616 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 617 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 618 // C++ [temp.names]p3: 619 // After name lookup (3.4) finds that a name is a template-name or that 620 // an operator-function-id or a literal- operator-id refers to a set of 621 // overloaded functions any member of which is a function template if 622 // this is followed by a <, the < is always taken as the delimiter of a 623 // template-argument-list and never as the less-than operator. 624 if (!IsFilteredTemplateName) 625 FilterAcceptableTemplateNames(Result); 626 627 if (!Result.empty()) { 628 bool IsFunctionTemplate; 629 TemplateName Template; 630 if (Result.end() - Result.begin() > 1) { 631 IsFunctionTemplate = true; 632 Template = Context.getOverloadedTemplateName(Result.begin(), 633 Result.end()); 634 } else { 635 TemplateDecl *TD 636 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 637 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 638 639 if (SS.isSet() && !SS.isInvalid()) 640 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 641 /*TemplateKeyword=*/false, 642 TD); 643 else 644 Template = TemplateName(TD); 645 } 646 647 if (IsFunctionTemplate) { 648 // Function templates always go through overload resolution, at which 649 // point we'll perform the various checks (e.g., accessibility) we need 650 // to based on which function we selected. 651 Result.suppressDiagnostics(); 652 653 return NameClassification::FunctionTemplate(Template); 654 } 655 656 return NameClassification::TypeTemplate(Template); 657 } 658 } 659 660 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 661 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 662 DiagnoseUseOfDecl(Type, NameLoc); 663 QualType T = Context.getTypeDeclType(Type); 664 return ParsedType::make(T); 665 } 666 667 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 668 if (!Class) { 669 // FIXME: It's unfortunate that we don't have a Type node for handling this. 670 if (ObjCCompatibleAliasDecl *Alias 671 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 672 Class = Alias->getClassInterface(); 673 } 674 675 if (Class) { 676 DiagnoseUseOfDecl(Class, NameLoc); 677 678 if (NextToken.is(tok::period)) { 679 // Interface. <something> is parsed as a property reference expression. 680 // Just return "unknown" as a fall-through for now. 681 Result.suppressDiagnostics(); 682 return NameClassification::Unknown(); 683 } 684 685 QualType T = Context.getObjCInterfaceType(Class); 686 return ParsedType::make(T); 687 } 688 689 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 690 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 691 692 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 693 return BuildDeclarationNameExpr(SS, Result, ADL); 694} 695 696// Determines the context to return to after temporarily entering a 697// context. This depends in an unnecessarily complicated way on the 698// exact ordering of callbacks from the parser. 699DeclContext *Sema::getContainingDC(DeclContext *DC) { 700 701 // Functions defined inline within classes aren't parsed until we've 702 // finished parsing the top-level class, so the top-level class is 703 // the context we'll need to return to. 704 if (isa<FunctionDecl>(DC)) { 705 DC = DC->getLexicalParent(); 706 707 // A function not defined within a class will always return to its 708 // lexical context. 709 if (!isa<CXXRecordDecl>(DC)) 710 return DC; 711 712 // A C++ inline method/friend is parsed *after* the topmost class 713 // it was declared in is fully parsed ("complete"); the topmost 714 // class is the context we need to return to. 715 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 716 DC = RD; 717 718 // Return the declaration context of the topmost class the inline method is 719 // declared in. 720 return DC; 721 } 722 723 return DC->getLexicalParent(); 724} 725 726void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 727 assert(getContainingDC(DC) == CurContext && 728 "The next DeclContext should be lexically contained in the current one."); 729 CurContext = DC; 730 S->setEntity(DC); 731} 732 733void Sema::PopDeclContext() { 734 assert(CurContext && "DeclContext imbalance!"); 735 736 CurContext = getContainingDC(CurContext); 737 assert(CurContext && "Popped translation unit!"); 738} 739 740/// EnterDeclaratorContext - Used when we must lookup names in the context 741/// of a declarator's nested name specifier. 742/// 743void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 744 // C++0x [basic.lookup.unqual]p13: 745 // A name used in the definition of a static data member of class 746 // X (after the qualified-id of the static member) is looked up as 747 // if the name was used in a member function of X. 748 // C++0x [basic.lookup.unqual]p14: 749 // If a variable member of a namespace is defined outside of the 750 // scope of its namespace then any name used in the definition of 751 // the variable member (after the declarator-id) is looked up as 752 // if the definition of the variable member occurred in its 753 // namespace. 754 // Both of these imply that we should push a scope whose context 755 // is the semantic context of the declaration. We can't use 756 // PushDeclContext here because that context is not necessarily 757 // lexically contained in the current context. Fortunately, 758 // the containing scope should have the appropriate information. 759 760 assert(!S->getEntity() && "scope already has entity"); 761 762#ifndef NDEBUG 763 Scope *Ancestor = S->getParent(); 764 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 765 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 766#endif 767 768 CurContext = DC; 769 S->setEntity(DC); 770} 771 772void Sema::ExitDeclaratorContext(Scope *S) { 773 assert(S->getEntity() == CurContext && "Context imbalance!"); 774 775 // Switch back to the lexical context. The safety of this is 776 // enforced by an assert in EnterDeclaratorContext. 777 Scope *Ancestor = S->getParent(); 778 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 779 CurContext = (DeclContext*) Ancestor->getEntity(); 780 781 // We don't need to do anything with the scope, which is going to 782 // disappear. 783} 784 785 786void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 787 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 788 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 789 // We assume that the caller has already called 790 // ActOnReenterTemplateScope 791 FD = TFD->getTemplatedDecl(); 792 } 793 if (!FD) 794 return; 795 796 PushDeclContext(S, FD); 797 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 798 ParmVarDecl *Param = FD->getParamDecl(P); 799 // If the parameter has an identifier, then add it to the scope 800 if (Param->getIdentifier()) { 801 S->AddDecl(Param); 802 IdResolver.AddDecl(Param); 803 } 804 } 805} 806 807 808/// \brief Determine whether we allow overloading of the function 809/// PrevDecl with another declaration. 810/// 811/// This routine determines whether overloading is possible, not 812/// whether some new function is actually an overload. It will return 813/// true in C++ (where we can always provide overloads) or, as an 814/// extension, in C when the previous function is already an 815/// overloaded function declaration or has the "overloadable" 816/// attribute. 817static bool AllowOverloadingOfFunction(LookupResult &Previous, 818 ASTContext &Context) { 819 if (Context.getLangOptions().CPlusPlus) 820 return true; 821 822 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 823 return true; 824 825 return (Previous.getResultKind() == LookupResult::Found 826 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 827} 828 829/// Add this decl to the scope shadowed decl chains. 830void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 831 // Move up the scope chain until we find the nearest enclosing 832 // non-transparent context. The declaration will be introduced into this 833 // scope. 834 while (S->getEntity() && 835 ((DeclContext *)S->getEntity())->isTransparentContext()) 836 S = S->getParent(); 837 838 // Add scoped declarations into their context, so that they can be 839 // found later. Declarations without a context won't be inserted 840 // into any context. 841 if (AddToContext) 842 CurContext->addDecl(D); 843 844 // Out-of-line definitions shouldn't be pushed into scope in C++. 845 // Out-of-line variable and function definitions shouldn't even in C. 846 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 847 D->isOutOfLine()) 848 return; 849 850 // Template instantiations should also not be pushed into scope. 851 if (isa<FunctionDecl>(D) && 852 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 853 return; 854 855 // If this replaces anything in the current scope, 856 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 857 IEnd = IdResolver.end(); 858 for (; I != IEnd; ++I) { 859 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 860 S->RemoveDecl(*I); 861 IdResolver.RemoveDecl(*I); 862 863 // Should only need to replace one decl. 864 break; 865 } 866 } 867 868 S->AddDecl(D); 869 870 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 871 // Implicitly-generated labels may end up getting generated in an order that 872 // isn't strictly lexical, which breaks name lookup. Be careful to insert 873 // the label at the appropriate place in the identifier chain. 874 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 875 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 876 if (IDC == CurContext) { 877 if (!S->isDeclScope(*I)) 878 continue; 879 } else if (IDC->Encloses(CurContext)) 880 break; 881 } 882 883 IdResolver.InsertDeclAfter(I, D); 884 } else { 885 IdResolver.AddDecl(D); 886 } 887} 888 889bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 890 bool ExplicitInstantiationOrSpecialization) { 891 return IdResolver.isDeclInScope(D, Ctx, Context, S, 892 ExplicitInstantiationOrSpecialization); 893} 894 895Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 896 DeclContext *TargetDC = DC->getPrimaryContext(); 897 do { 898 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 899 if (ScopeDC->getPrimaryContext() == TargetDC) 900 return S; 901 } while ((S = S->getParent())); 902 903 return 0; 904} 905 906static bool isOutOfScopePreviousDeclaration(NamedDecl *, 907 DeclContext*, 908 ASTContext&); 909 910/// Filters out lookup results that don't fall within the given scope 911/// as determined by isDeclInScope. 912void Sema::FilterLookupForScope(LookupResult &R, 913 DeclContext *Ctx, Scope *S, 914 bool ConsiderLinkage, 915 bool ExplicitInstantiationOrSpecialization) { 916 LookupResult::Filter F = R.makeFilter(); 917 while (F.hasNext()) { 918 NamedDecl *D = F.next(); 919 920 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 921 continue; 922 923 if (ConsiderLinkage && 924 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 925 continue; 926 927 F.erase(); 928 } 929 930 F.done(); 931} 932 933static bool isUsingDecl(NamedDecl *D) { 934 return isa<UsingShadowDecl>(D) || 935 isa<UnresolvedUsingTypenameDecl>(D) || 936 isa<UnresolvedUsingValueDecl>(D); 937} 938 939/// Removes using shadow declarations from the lookup results. 940static void RemoveUsingDecls(LookupResult &R) { 941 LookupResult::Filter F = R.makeFilter(); 942 while (F.hasNext()) 943 if (isUsingDecl(F.next())) 944 F.erase(); 945 946 F.done(); 947} 948 949/// \brief Check for this common pattern: 950/// @code 951/// class S { 952/// S(const S&); // DO NOT IMPLEMENT 953/// void operator=(const S&); // DO NOT IMPLEMENT 954/// }; 955/// @endcode 956static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 957 // FIXME: Should check for private access too but access is set after we get 958 // the decl here. 959 if (D->doesThisDeclarationHaveABody()) 960 return false; 961 962 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 963 return CD->isCopyConstructor(); 964 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 965 return Method->isCopyAssignmentOperator(); 966 return false; 967} 968 969bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 970 assert(D); 971 972 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 973 return false; 974 975 // Ignore class templates. 976 if (D->getDeclContext()->isDependentContext() || 977 D->getLexicalDeclContext()->isDependentContext()) 978 return false; 979 980 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 981 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 982 return false; 983 984 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 985 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 986 return false; 987 } else { 988 // 'static inline' functions are used in headers; don't warn. 989 if (FD->getStorageClass() == SC_Static && 990 FD->isInlineSpecified()) 991 return false; 992 } 993 994 if (FD->doesThisDeclarationHaveABody() && 995 Context.DeclMustBeEmitted(FD)) 996 return false; 997 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 998 if (!VD->isFileVarDecl() || 999 VD->getType().isConstant(Context) || 1000 Context.DeclMustBeEmitted(VD)) 1001 return false; 1002 1003 if (VD->isStaticDataMember() && 1004 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1005 return false; 1006 1007 } else { 1008 return false; 1009 } 1010 1011 // Only warn for unused decls internal to the translation unit. 1012 if (D->getLinkage() == ExternalLinkage) 1013 return false; 1014 1015 return true; 1016} 1017 1018void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1019 if (!D) 1020 return; 1021 1022 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1023 const FunctionDecl *First = FD->getFirstDeclaration(); 1024 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1025 return; // First should already be in the vector. 1026 } 1027 1028 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1029 const VarDecl *First = VD->getFirstDeclaration(); 1030 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1031 return; // First should already be in the vector. 1032 } 1033 1034 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1035 UnusedFileScopedDecls.push_back(D); 1036 } 1037 1038static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1039 if (D->isInvalidDecl()) 1040 return false; 1041 1042 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1043 return false; 1044 1045 if (isa<LabelDecl>(D)) 1046 return true; 1047 1048 // White-list anything that isn't a local variable. 1049 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1050 !D->getDeclContext()->isFunctionOrMethod()) 1051 return false; 1052 1053 // Types of valid local variables should be complete, so this should succeed. 1054 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1055 1056 // White-list anything with an __attribute__((unused)) type. 1057 QualType Ty = VD->getType(); 1058 1059 // Only look at the outermost level of typedef. 1060 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1061 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1062 return false; 1063 } 1064 1065 // If we failed to complete the type for some reason, or if the type is 1066 // dependent, don't diagnose the variable. 1067 if (Ty->isIncompleteType() || Ty->isDependentType()) 1068 return false; 1069 1070 if (const TagType *TT = Ty->getAs<TagType>()) { 1071 const TagDecl *Tag = TT->getDecl(); 1072 if (Tag->hasAttr<UnusedAttr>()) 1073 return false; 1074 1075 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1076 // FIXME: Checking for the presence of a user-declared constructor 1077 // isn't completely accurate; we'd prefer to check that the initializer 1078 // has no side effects. 1079 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1080 return false; 1081 } 1082 } 1083 1084 // TODO: __attribute__((unused)) templates? 1085 } 1086 1087 return true; 1088} 1089 1090static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1091 FixItHint &Hint) { 1092 if (isa<LabelDecl>(D)) { 1093 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1094 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1095 if (AfterColon.isInvalid()) 1096 return; 1097 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1098 getCharRange(D->getLocStart(), AfterColon)); 1099 } 1100 return; 1101} 1102 1103/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1104/// unless they are marked attr(unused). 1105void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1106 FixItHint Hint; 1107 if (!ShouldDiagnoseUnusedDecl(D)) 1108 return; 1109 1110 GenerateFixForUnusedDecl(D, Context, Hint); 1111 1112 unsigned DiagID; 1113 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1114 DiagID = diag::warn_unused_exception_param; 1115 else if (isa<LabelDecl>(D)) 1116 DiagID = diag::warn_unused_label; 1117 else 1118 DiagID = diag::warn_unused_variable; 1119 1120 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1121} 1122 1123static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1124 // Verify that we have no forward references left. If so, there was a goto 1125 // or address of a label taken, but no definition of it. Label fwd 1126 // definitions are indicated with a null substmt. 1127 if (L->getStmt() == 0) 1128 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1129} 1130 1131void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1132 if (S->decl_empty()) return; 1133 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1134 "Scope shouldn't contain decls!"); 1135 1136 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1137 I != E; ++I) { 1138 Decl *TmpD = (*I); 1139 assert(TmpD && "This decl didn't get pushed??"); 1140 1141 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1142 NamedDecl *D = cast<NamedDecl>(TmpD); 1143 1144 if (!D->getDeclName()) continue; 1145 1146 // Diagnose unused variables in this scope. 1147 if (!S->hasErrorOccurred()) 1148 DiagnoseUnusedDecl(D); 1149 1150 // If this was a forward reference to a label, verify it was defined. 1151 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1152 CheckPoppedLabel(LD, *this); 1153 1154 // Remove this name from our lexical scope. 1155 IdResolver.RemoveDecl(D); 1156 } 1157} 1158 1159/// \brief Look for an Objective-C class in the translation unit. 1160/// 1161/// \param Id The name of the Objective-C class we're looking for. If 1162/// typo-correction fixes this name, the Id will be updated 1163/// to the fixed name. 1164/// 1165/// \param IdLoc The location of the name in the translation unit. 1166/// 1167/// \param TypoCorrection If true, this routine will attempt typo correction 1168/// if there is no class with the given name. 1169/// 1170/// \returns The declaration of the named Objective-C class, or NULL if the 1171/// class could not be found. 1172ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1173 SourceLocation IdLoc, 1174 bool DoTypoCorrection) { 1175 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1176 // creation from this context. 1177 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1178 1179 if (!IDecl && DoTypoCorrection) { 1180 // Perform typo correction at the given location, but only if we 1181 // find an Objective-C class name. 1182 TypoCorrection C; 1183 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1184 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1185 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1186 Diag(IdLoc, diag::err_undef_interface_suggest) 1187 << Id << IDecl->getDeclName() 1188 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1189 Diag(IDecl->getLocation(), diag::note_previous_decl) 1190 << IDecl->getDeclName(); 1191 1192 Id = IDecl->getIdentifier(); 1193 } 1194 } 1195 1196 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1197} 1198 1199/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1200/// from S, where a non-field would be declared. This routine copes 1201/// with the difference between C and C++ scoping rules in structs and 1202/// unions. For example, the following code is well-formed in C but 1203/// ill-formed in C++: 1204/// @code 1205/// struct S6 { 1206/// enum { BAR } e; 1207/// }; 1208/// 1209/// void test_S6() { 1210/// struct S6 a; 1211/// a.e = BAR; 1212/// } 1213/// @endcode 1214/// For the declaration of BAR, this routine will return a different 1215/// scope. The scope S will be the scope of the unnamed enumeration 1216/// within S6. In C++, this routine will return the scope associated 1217/// with S6, because the enumeration's scope is a transparent 1218/// context but structures can contain non-field names. In C, this 1219/// routine will return the translation unit scope, since the 1220/// enumeration's scope is a transparent context and structures cannot 1221/// contain non-field names. 1222Scope *Sema::getNonFieldDeclScope(Scope *S) { 1223 while (((S->getFlags() & Scope::DeclScope) == 0) || 1224 (S->getEntity() && 1225 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1226 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1227 S = S->getParent(); 1228 return S; 1229} 1230 1231/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1232/// file scope. lazily create a decl for it. ForRedeclaration is true 1233/// if we're creating this built-in in anticipation of redeclaring the 1234/// built-in. 1235NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1236 Scope *S, bool ForRedeclaration, 1237 SourceLocation Loc) { 1238 Builtin::ID BID = (Builtin::ID)bid; 1239 1240 ASTContext::GetBuiltinTypeError Error; 1241 QualType R = Context.GetBuiltinType(BID, Error); 1242 switch (Error) { 1243 case ASTContext::GE_None: 1244 // Okay 1245 break; 1246 1247 case ASTContext::GE_Missing_stdio: 1248 if (ForRedeclaration) 1249 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1250 << Context.BuiltinInfo.GetName(BID); 1251 return 0; 1252 1253 case ASTContext::GE_Missing_setjmp: 1254 if (ForRedeclaration) 1255 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1256 << Context.BuiltinInfo.GetName(BID); 1257 return 0; 1258 } 1259 1260 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1261 Diag(Loc, diag::ext_implicit_lib_function_decl) 1262 << Context.BuiltinInfo.GetName(BID) 1263 << R; 1264 if (Context.BuiltinInfo.getHeaderName(BID) && 1265 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1266 != DiagnosticsEngine::Ignored) 1267 Diag(Loc, diag::note_please_include_header) 1268 << Context.BuiltinInfo.getHeaderName(BID) 1269 << Context.BuiltinInfo.GetName(BID); 1270 } 1271 1272 FunctionDecl *New = FunctionDecl::Create(Context, 1273 Context.getTranslationUnitDecl(), 1274 Loc, Loc, II, R, /*TInfo=*/0, 1275 SC_Extern, 1276 SC_None, false, 1277 /*hasPrototype=*/true); 1278 New->setImplicit(); 1279 1280 // Create Decl objects for each parameter, adding them to the 1281 // FunctionDecl. 1282 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1283 SmallVector<ParmVarDecl*, 16> Params; 1284 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1285 ParmVarDecl *parm = 1286 ParmVarDecl::Create(Context, New, SourceLocation(), 1287 SourceLocation(), 0, 1288 FT->getArgType(i), /*TInfo=*/0, 1289 SC_None, SC_None, 0); 1290 parm->setScopeInfo(0, i); 1291 Params.push_back(parm); 1292 } 1293 New->setParams(Params); 1294 } 1295 1296 AddKnownFunctionAttributes(New); 1297 1298 // TUScope is the translation-unit scope to insert this function into. 1299 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1300 // relate Scopes to DeclContexts, and probably eliminate CurContext 1301 // entirely, but we're not there yet. 1302 DeclContext *SavedContext = CurContext; 1303 CurContext = Context.getTranslationUnitDecl(); 1304 PushOnScopeChains(New, TUScope); 1305 CurContext = SavedContext; 1306 return New; 1307} 1308 1309/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1310/// same name and scope as a previous declaration 'Old'. Figure out 1311/// how to resolve this situation, merging decls or emitting 1312/// diagnostics as appropriate. If there was an error, set New to be invalid. 1313/// 1314void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1315 // If the new decl is known invalid already, don't bother doing any 1316 // merging checks. 1317 if (New->isInvalidDecl()) return; 1318 1319 // Allow multiple definitions for ObjC built-in typedefs. 1320 // FIXME: Verify the underlying types are equivalent! 1321 if (getLangOptions().ObjC1) { 1322 const IdentifierInfo *TypeID = New->getIdentifier(); 1323 switch (TypeID->getLength()) { 1324 default: break; 1325 case 2: 1326 if (!TypeID->isStr("id")) 1327 break; 1328 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1329 // Install the built-in type for 'id', ignoring the current definition. 1330 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1331 return; 1332 case 5: 1333 if (!TypeID->isStr("Class")) 1334 break; 1335 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1336 // Install the built-in type for 'Class', ignoring the current definition. 1337 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1338 return; 1339 case 3: 1340 if (!TypeID->isStr("SEL")) 1341 break; 1342 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1343 // Install the built-in type for 'SEL', ignoring the current definition. 1344 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1345 return; 1346 } 1347 // Fall through - the typedef name was not a builtin type. 1348 } 1349 1350 // Verify the old decl was also a type. 1351 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1352 if (!Old) { 1353 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1354 << New->getDeclName(); 1355 1356 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1357 if (OldD->getLocation().isValid()) 1358 Diag(OldD->getLocation(), diag::note_previous_definition); 1359 1360 return New->setInvalidDecl(); 1361 } 1362 1363 // If the old declaration is invalid, just give up here. 1364 if (Old->isInvalidDecl()) 1365 return New->setInvalidDecl(); 1366 1367 // Determine the "old" type we'll use for checking and diagnostics. 1368 QualType OldType; 1369 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1370 OldType = OldTypedef->getUnderlyingType(); 1371 else 1372 OldType = Context.getTypeDeclType(Old); 1373 1374 // If the typedef types are not identical, reject them in all languages and 1375 // with any extensions enabled. 1376 1377 if (OldType != New->getUnderlyingType() && 1378 Context.getCanonicalType(OldType) != 1379 Context.getCanonicalType(New->getUnderlyingType())) { 1380 int Kind = 0; 1381 if (isa<TypeAliasDecl>(Old)) 1382 Kind = 1; 1383 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1384 << Kind << New->getUnderlyingType() << OldType; 1385 if (Old->getLocation().isValid()) 1386 Diag(Old->getLocation(), diag::note_previous_definition); 1387 return New->setInvalidDecl(); 1388 } 1389 1390 // The types match. Link up the redeclaration chain if the old 1391 // declaration was a typedef. 1392 // FIXME: this is a potential source of weirdness if the type 1393 // spellings don't match exactly. 1394 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1395 New->setPreviousDeclaration(Typedef); 1396 1397 // __module_private__ is propagated to later declarations. 1398 if (Old->isModulePrivate()) 1399 New->setModulePrivate(); 1400 else if (New->isModulePrivate()) 1401 diagnoseModulePrivateRedeclaration(New, Old); 1402 1403 if (getLangOptions().MicrosoftExt) 1404 return; 1405 1406 if (getLangOptions().CPlusPlus) { 1407 // C++ [dcl.typedef]p2: 1408 // In a given non-class scope, a typedef specifier can be used to 1409 // redefine the name of any type declared in that scope to refer 1410 // to the type to which it already refers. 1411 if (!isa<CXXRecordDecl>(CurContext)) 1412 return; 1413 1414 // C++0x [dcl.typedef]p4: 1415 // In a given class scope, a typedef specifier can be used to redefine 1416 // any class-name declared in that scope that is not also a typedef-name 1417 // to refer to the type to which it already refers. 1418 // 1419 // This wording came in via DR424, which was a correction to the 1420 // wording in DR56, which accidentally banned code like: 1421 // 1422 // struct S { 1423 // typedef struct A { } A; 1424 // }; 1425 // 1426 // in the C++03 standard. We implement the C++0x semantics, which 1427 // allow the above but disallow 1428 // 1429 // struct S { 1430 // typedef int I; 1431 // typedef int I; 1432 // }; 1433 // 1434 // since that was the intent of DR56. 1435 if (!isa<TypedefNameDecl>(Old)) 1436 return; 1437 1438 Diag(New->getLocation(), diag::err_redefinition) 1439 << New->getDeclName(); 1440 Diag(Old->getLocation(), diag::note_previous_definition); 1441 return New->setInvalidDecl(); 1442 } 1443 1444 // If we have a redefinition of a typedef in C, emit a warning. This warning 1445 // is normally mapped to an error, but can be controlled with 1446 // -Wtypedef-redefinition. If either the original or the redefinition is 1447 // in a system header, don't emit this for compatibility with GCC. 1448 if (getDiagnostics().getSuppressSystemWarnings() && 1449 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1450 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1451 return; 1452 1453 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1454 << New->getDeclName(); 1455 Diag(Old->getLocation(), diag::note_previous_definition); 1456 return; 1457} 1458 1459/// DeclhasAttr - returns true if decl Declaration already has the target 1460/// attribute. 1461static bool 1462DeclHasAttr(const Decl *D, const Attr *A) { 1463 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1464 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1465 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1466 if ((*i)->getKind() == A->getKind()) { 1467 if (Ann) { 1468 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1469 return true; 1470 continue; 1471 } 1472 // FIXME: Don't hardcode this check 1473 if (OA && isa<OwnershipAttr>(*i)) 1474 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1475 return true; 1476 } 1477 1478 return false; 1479} 1480 1481/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1482static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1483 ASTContext &C, bool mergeDeprecation = true) { 1484 if (!oldDecl->hasAttrs()) 1485 return; 1486 1487 bool foundAny = newDecl->hasAttrs(); 1488 1489 // Ensure that any moving of objects within the allocated map is done before 1490 // we process them. 1491 if (!foundAny) newDecl->setAttrs(AttrVec()); 1492 1493 for (specific_attr_iterator<InheritableAttr> 1494 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1495 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1496 // Ignore deprecated/unavailable/availability attributes if requested. 1497 if (!mergeDeprecation && 1498 (isa<DeprecatedAttr>(*i) || 1499 isa<UnavailableAttr>(*i) || 1500 isa<AvailabilityAttr>(*i))) 1501 continue; 1502 1503 if (!DeclHasAttr(newDecl, *i)) { 1504 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1505 newAttr->setInherited(true); 1506 newDecl->addAttr(newAttr); 1507 foundAny = true; 1508 } 1509 } 1510 1511 if (!foundAny) newDecl->dropAttrs(); 1512} 1513 1514/// mergeParamDeclAttributes - Copy attributes from the old parameter 1515/// to the new one. 1516static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1517 const ParmVarDecl *oldDecl, 1518 ASTContext &C) { 1519 if (!oldDecl->hasAttrs()) 1520 return; 1521 1522 bool foundAny = newDecl->hasAttrs(); 1523 1524 // Ensure that any moving of objects within the allocated map is 1525 // done before we process them. 1526 if (!foundAny) newDecl->setAttrs(AttrVec()); 1527 1528 for (specific_attr_iterator<InheritableParamAttr> 1529 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1530 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1531 if (!DeclHasAttr(newDecl, *i)) { 1532 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1533 newAttr->setInherited(true); 1534 newDecl->addAttr(newAttr); 1535 foundAny = true; 1536 } 1537 } 1538 1539 if (!foundAny) newDecl->dropAttrs(); 1540} 1541 1542namespace { 1543 1544/// Used in MergeFunctionDecl to keep track of function parameters in 1545/// C. 1546struct GNUCompatibleParamWarning { 1547 ParmVarDecl *OldParm; 1548 ParmVarDecl *NewParm; 1549 QualType PromotedType; 1550}; 1551 1552} 1553 1554/// getSpecialMember - get the special member enum for a method. 1555Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1556 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1557 if (Ctor->isDefaultConstructor()) 1558 return Sema::CXXDefaultConstructor; 1559 1560 if (Ctor->isCopyConstructor()) 1561 return Sema::CXXCopyConstructor; 1562 1563 if (Ctor->isMoveConstructor()) 1564 return Sema::CXXMoveConstructor; 1565 } else if (isa<CXXDestructorDecl>(MD)) { 1566 return Sema::CXXDestructor; 1567 } else if (MD->isCopyAssignmentOperator()) { 1568 return Sema::CXXCopyAssignment; 1569 } else if (MD->isMoveAssignmentOperator()) { 1570 return Sema::CXXMoveAssignment; 1571 } 1572 1573 return Sema::CXXInvalid; 1574} 1575 1576/// canRedefineFunction - checks if a function can be redefined. Currently, 1577/// only extern inline functions can be redefined, and even then only in 1578/// GNU89 mode. 1579static bool canRedefineFunction(const FunctionDecl *FD, 1580 const LangOptions& LangOpts) { 1581 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1582 !LangOpts.CPlusPlus && 1583 FD->isInlineSpecified() && 1584 FD->getStorageClass() == SC_Extern); 1585} 1586 1587/// MergeFunctionDecl - We just parsed a function 'New' from 1588/// declarator D which has the same name and scope as a previous 1589/// declaration 'Old'. Figure out how to resolve this situation, 1590/// merging decls or emitting diagnostics as appropriate. 1591/// 1592/// In C++, New and Old must be declarations that are not 1593/// overloaded. Use IsOverload to determine whether New and Old are 1594/// overloaded, and to select the Old declaration that New should be 1595/// merged with. 1596/// 1597/// Returns true if there was an error, false otherwise. 1598bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1599 // Verify the old decl was also a function. 1600 FunctionDecl *Old = 0; 1601 if (FunctionTemplateDecl *OldFunctionTemplate 1602 = dyn_cast<FunctionTemplateDecl>(OldD)) 1603 Old = OldFunctionTemplate->getTemplatedDecl(); 1604 else 1605 Old = dyn_cast<FunctionDecl>(OldD); 1606 if (!Old) { 1607 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1608 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1609 Diag(Shadow->getTargetDecl()->getLocation(), 1610 diag::note_using_decl_target); 1611 Diag(Shadow->getUsingDecl()->getLocation(), 1612 diag::note_using_decl) << 0; 1613 return true; 1614 } 1615 1616 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1617 << New->getDeclName(); 1618 Diag(OldD->getLocation(), diag::note_previous_definition); 1619 return true; 1620 } 1621 1622 // Determine whether the previous declaration was a definition, 1623 // implicit declaration, or a declaration. 1624 diag::kind PrevDiag; 1625 if (Old->isThisDeclarationADefinition()) 1626 PrevDiag = diag::note_previous_definition; 1627 else if (Old->isImplicit()) 1628 PrevDiag = diag::note_previous_implicit_declaration; 1629 else 1630 PrevDiag = diag::note_previous_declaration; 1631 1632 QualType OldQType = Context.getCanonicalType(Old->getType()); 1633 QualType NewQType = Context.getCanonicalType(New->getType()); 1634 1635 // Don't complain about this if we're in GNU89 mode and the old function 1636 // is an extern inline function. 1637 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1638 New->getStorageClass() == SC_Static && 1639 Old->getStorageClass() != SC_Static && 1640 !canRedefineFunction(Old, getLangOptions())) { 1641 if (getLangOptions().MicrosoftExt) { 1642 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1643 Diag(Old->getLocation(), PrevDiag); 1644 } else { 1645 Diag(New->getLocation(), diag::err_static_non_static) << New; 1646 Diag(Old->getLocation(), PrevDiag); 1647 return true; 1648 } 1649 } 1650 1651 // If a function is first declared with a calling convention, but is 1652 // later declared or defined without one, the second decl assumes the 1653 // calling convention of the first. 1654 // 1655 // For the new decl, we have to look at the NON-canonical type to tell the 1656 // difference between a function that really doesn't have a calling 1657 // convention and one that is declared cdecl. That's because in 1658 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1659 // because it is the default calling convention. 1660 // 1661 // Note also that we DO NOT return at this point, because we still have 1662 // other tests to run. 1663 const FunctionType *OldType = cast<FunctionType>(OldQType); 1664 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1665 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1666 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1667 bool RequiresAdjustment = false; 1668 if (OldTypeInfo.getCC() != CC_Default && 1669 NewTypeInfo.getCC() == CC_Default) { 1670 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1671 RequiresAdjustment = true; 1672 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1673 NewTypeInfo.getCC())) { 1674 // Calling conventions really aren't compatible, so complain. 1675 Diag(New->getLocation(), diag::err_cconv_change) 1676 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1677 << (OldTypeInfo.getCC() == CC_Default) 1678 << (OldTypeInfo.getCC() == CC_Default ? "" : 1679 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1680 Diag(Old->getLocation(), diag::note_previous_declaration); 1681 return true; 1682 } 1683 1684 // FIXME: diagnose the other way around? 1685 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1686 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1687 RequiresAdjustment = true; 1688 } 1689 1690 // Merge regparm attribute. 1691 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1692 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1693 if (NewTypeInfo.getHasRegParm()) { 1694 Diag(New->getLocation(), diag::err_regparm_mismatch) 1695 << NewType->getRegParmType() 1696 << OldType->getRegParmType(); 1697 Diag(Old->getLocation(), diag::note_previous_declaration); 1698 return true; 1699 } 1700 1701 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1702 RequiresAdjustment = true; 1703 } 1704 1705 if (RequiresAdjustment) { 1706 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1707 New->setType(QualType(NewType, 0)); 1708 NewQType = Context.getCanonicalType(New->getType()); 1709 } 1710 1711 if (getLangOptions().CPlusPlus) { 1712 // (C++98 13.1p2): 1713 // Certain function declarations cannot be overloaded: 1714 // -- Function declarations that differ only in the return type 1715 // cannot be overloaded. 1716 QualType OldReturnType = OldType->getResultType(); 1717 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1718 QualType ResQT; 1719 if (OldReturnType != NewReturnType) { 1720 if (NewReturnType->isObjCObjectPointerType() 1721 && OldReturnType->isObjCObjectPointerType()) 1722 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1723 if (ResQT.isNull()) { 1724 if (New->isCXXClassMember() && New->isOutOfLine()) 1725 Diag(New->getLocation(), 1726 diag::err_member_def_does_not_match_ret_type) << New; 1727 else 1728 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1729 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1730 return true; 1731 } 1732 else 1733 NewQType = ResQT; 1734 } 1735 1736 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1737 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1738 if (OldMethod && NewMethod) { 1739 // Preserve triviality. 1740 NewMethod->setTrivial(OldMethod->isTrivial()); 1741 1742 // MSVC allows explicit template specialization at class scope: 1743 // 2 CXMethodDecls referring to the same function will be injected. 1744 // We don't want a redeclartion error. 1745 bool IsClassScopeExplicitSpecialization = 1746 OldMethod->isFunctionTemplateSpecialization() && 1747 NewMethod->isFunctionTemplateSpecialization(); 1748 bool isFriend = NewMethod->getFriendObjectKind(); 1749 1750 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1751 !IsClassScopeExplicitSpecialization) { 1752 // -- Member function declarations with the same name and the 1753 // same parameter types cannot be overloaded if any of them 1754 // is a static member function declaration. 1755 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1756 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1757 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1758 return true; 1759 } 1760 1761 // C++ [class.mem]p1: 1762 // [...] A member shall not be declared twice in the 1763 // member-specification, except that a nested class or member 1764 // class template can be declared and then later defined. 1765 unsigned NewDiag; 1766 if (isa<CXXConstructorDecl>(OldMethod)) 1767 NewDiag = diag::err_constructor_redeclared; 1768 else if (isa<CXXDestructorDecl>(NewMethod)) 1769 NewDiag = diag::err_destructor_redeclared; 1770 else if (isa<CXXConversionDecl>(NewMethod)) 1771 NewDiag = diag::err_conv_function_redeclared; 1772 else 1773 NewDiag = diag::err_member_redeclared; 1774 1775 Diag(New->getLocation(), NewDiag); 1776 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1777 1778 // Complain if this is an explicit declaration of a special 1779 // member that was initially declared implicitly. 1780 // 1781 // As an exception, it's okay to befriend such methods in order 1782 // to permit the implicit constructor/destructor/operator calls. 1783 } else if (OldMethod->isImplicit()) { 1784 if (isFriend) { 1785 NewMethod->setImplicit(); 1786 } else { 1787 Diag(NewMethod->getLocation(), 1788 diag::err_definition_of_implicitly_declared_member) 1789 << New << getSpecialMember(OldMethod); 1790 return true; 1791 } 1792 } else if (OldMethod->isExplicitlyDefaulted()) { 1793 Diag(NewMethod->getLocation(), 1794 diag::err_definition_of_explicitly_defaulted_member) 1795 << getSpecialMember(OldMethod); 1796 return true; 1797 } 1798 } 1799 1800 // (C++98 8.3.5p3): 1801 // All declarations for a function shall agree exactly in both the 1802 // return type and the parameter-type-list. 1803 // We also want to respect all the extended bits except noreturn. 1804 1805 // noreturn should now match unless the old type info didn't have it. 1806 QualType OldQTypeForComparison = OldQType; 1807 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1808 assert(OldQType == QualType(OldType, 0)); 1809 const FunctionType *OldTypeForComparison 1810 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1811 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1812 assert(OldQTypeForComparison.isCanonical()); 1813 } 1814 1815 if (OldQTypeForComparison == NewQType) 1816 return MergeCompatibleFunctionDecls(New, Old); 1817 1818 // Fall through for conflicting redeclarations and redefinitions. 1819 } 1820 1821 // C: Function types need to be compatible, not identical. This handles 1822 // duplicate function decls like "void f(int); void f(enum X);" properly. 1823 if (!getLangOptions().CPlusPlus && 1824 Context.typesAreCompatible(OldQType, NewQType)) { 1825 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1826 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1827 const FunctionProtoType *OldProto = 0; 1828 if (isa<FunctionNoProtoType>(NewFuncType) && 1829 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1830 // The old declaration provided a function prototype, but the 1831 // new declaration does not. Merge in the prototype. 1832 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1833 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1834 OldProto->arg_type_end()); 1835 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1836 ParamTypes.data(), ParamTypes.size(), 1837 OldProto->getExtProtoInfo()); 1838 New->setType(NewQType); 1839 New->setHasInheritedPrototype(); 1840 1841 // Synthesize a parameter for each argument type. 1842 SmallVector<ParmVarDecl*, 16> Params; 1843 for (FunctionProtoType::arg_type_iterator 1844 ParamType = OldProto->arg_type_begin(), 1845 ParamEnd = OldProto->arg_type_end(); 1846 ParamType != ParamEnd; ++ParamType) { 1847 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1848 SourceLocation(), 1849 SourceLocation(), 0, 1850 *ParamType, /*TInfo=*/0, 1851 SC_None, SC_None, 1852 0); 1853 Param->setScopeInfo(0, Params.size()); 1854 Param->setImplicit(); 1855 Params.push_back(Param); 1856 } 1857 1858 New->setParams(Params); 1859 } 1860 1861 return MergeCompatibleFunctionDecls(New, Old); 1862 } 1863 1864 // GNU C permits a K&R definition to follow a prototype declaration 1865 // if the declared types of the parameters in the K&R definition 1866 // match the types in the prototype declaration, even when the 1867 // promoted types of the parameters from the K&R definition differ 1868 // from the types in the prototype. GCC then keeps the types from 1869 // the prototype. 1870 // 1871 // If a variadic prototype is followed by a non-variadic K&R definition, 1872 // the K&R definition becomes variadic. This is sort of an edge case, but 1873 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1874 // C99 6.9.1p8. 1875 if (!getLangOptions().CPlusPlus && 1876 Old->hasPrototype() && !New->hasPrototype() && 1877 New->getType()->getAs<FunctionProtoType>() && 1878 Old->getNumParams() == New->getNumParams()) { 1879 SmallVector<QualType, 16> ArgTypes; 1880 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1881 const FunctionProtoType *OldProto 1882 = Old->getType()->getAs<FunctionProtoType>(); 1883 const FunctionProtoType *NewProto 1884 = New->getType()->getAs<FunctionProtoType>(); 1885 1886 // Determine whether this is the GNU C extension. 1887 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1888 NewProto->getResultType()); 1889 bool LooseCompatible = !MergedReturn.isNull(); 1890 for (unsigned Idx = 0, End = Old->getNumParams(); 1891 LooseCompatible && Idx != End; ++Idx) { 1892 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1893 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1894 if (Context.typesAreCompatible(OldParm->getType(), 1895 NewProto->getArgType(Idx))) { 1896 ArgTypes.push_back(NewParm->getType()); 1897 } else if (Context.typesAreCompatible(OldParm->getType(), 1898 NewParm->getType(), 1899 /*CompareUnqualified=*/true)) { 1900 GNUCompatibleParamWarning Warn 1901 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1902 Warnings.push_back(Warn); 1903 ArgTypes.push_back(NewParm->getType()); 1904 } else 1905 LooseCompatible = false; 1906 } 1907 1908 if (LooseCompatible) { 1909 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1910 Diag(Warnings[Warn].NewParm->getLocation(), 1911 diag::ext_param_promoted_not_compatible_with_prototype) 1912 << Warnings[Warn].PromotedType 1913 << Warnings[Warn].OldParm->getType(); 1914 if (Warnings[Warn].OldParm->getLocation().isValid()) 1915 Diag(Warnings[Warn].OldParm->getLocation(), 1916 diag::note_previous_declaration); 1917 } 1918 1919 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1920 ArgTypes.size(), 1921 OldProto->getExtProtoInfo())); 1922 return MergeCompatibleFunctionDecls(New, Old); 1923 } 1924 1925 // Fall through to diagnose conflicting types. 1926 } 1927 1928 // A function that has already been declared has been redeclared or defined 1929 // with a different type- show appropriate diagnostic 1930 if (unsigned BuiltinID = Old->getBuiltinID()) { 1931 // The user has declared a builtin function with an incompatible 1932 // signature. 1933 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1934 // The function the user is redeclaring is a library-defined 1935 // function like 'malloc' or 'printf'. Warn about the 1936 // redeclaration, then pretend that we don't know about this 1937 // library built-in. 1938 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1939 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1940 << Old << Old->getType(); 1941 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1942 Old->setInvalidDecl(); 1943 return false; 1944 } 1945 1946 PrevDiag = diag::note_previous_builtin_declaration; 1947 } 1948 1949 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1950 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1951 return true; 1952} 1953 1954/// \brief Completes the merge of two function declarations that are 1955/// known to be compatible. 1956/// 1957/// This routine handles the merging of attributes and other 1958/// properties of function declarations form the old declaration to 1959/// the new declaration, once we know that New is in fact a 1960/// redeclaration of Old. 1961/// 1962/// \returns false 1963bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1964 // Merge the attributes 1965 mergeDeclAttributes(New, Old, Context); 1966 1967 // Merge the storage class. 1968 if (Old->getStorageClass() != SC_Extern && 1969 Old->getStorageClass() != SC_None) 1970 New->setStorageClass(Old->getStorageClass()); 1971 1972 // Merge "pure" flag. 1973 if (Old->isPure()) 1974 New->setPure(); 1975 1976 // __module_private__ is propagated to later declarations. 1977 if (Old->isModulePrivate()) 1978 New->setModulePrivate(); 1979 else if (New->isModulePrivate()) 1980 diagnoseModulePrivateRedeclaration(New, Old); 1981 1982 // Merge attributes from the parameters. These can mismatch with K&R 1983 // declarations. 1984 if (New->getNumParams() == Old->getNumParams()) 1985 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1986 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1987 Context); 1988 1989 if (getLangOptions().CPlusPlus) 1990 return MergeCXXFunctionDecl(New, Old); 1991 1992 return false; 1993} 1994 1995 1996void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1997 const ObjCMethodDecl *oldMethod) { 1998 // We don't want to merge unavailable and deprecated attributes 1999 // except from interface to implementation. 2000 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2001 2002 // Merge the attributes. 2003 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2004 2005 // Merge attributes from the parameters. 2006 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 2007 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2008 ni != ne; ++ni, ++oi) 2009 mergeParamDeclAttributes(*ni, *oi, Context); 2010 2011 CheckObjCMethodOverride(newMethod, oldMethod, true); 2012} 2013 2014/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2015/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2016/// emitting diagnostics as appropriate. 2017/// 2018/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2019/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2020/// check them before the initializer is attached. 2021/// 2022void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2023 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2024 return; 2025 2026 QualType MergedT; 2027 if (getLangOptions().CPlusPlus) { 2028 AutoType *AT = New->getType()->getContainedAutoType(); 2029 if (AT && !AT->isDeduced()) { 2030 // We don't know what the new type is until the initializer is attached. 2031 return; 2032 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2033 // These could still be something that needs exception specs checked. 2034 return MergeVarDeclExceptionSpecs(New, Old); 2035 } 2036 // C++ [basic.link]p10: 2037 // [...] the types specified by all declarations referring to a given 2038 // object or function shall be identical, except that declarations for an 2039 // array object can specify array types that differ by the presence or 2040 // absence of a major array bound (8.3.4). 2041 else if (Old->getType()->isIncompleteArrayType() && 2042 New->getType()->isArrayType()) { 2043 CanQual<ArrayType> OldArray 2044 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2045 CanQual<ArrayType> NewArray 2046 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2047 if (OldArray->getElementType() == NewArray->getElementType()) 2048 MergedT = New->getType(); 2049 } else if (Old->getType()->isArrayType() && 2050 New->getType()->isIncompleteArrayType()) { 2051 CanQual<ArrayType> OldArray 2052 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2053 CanQual<ArrayType> NewArray 2054 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2055 if (OldArray->getElementType() == NewArray->getElementType()) 2056 MergedT = Old->getType(); 2057 } else if (New->getType()->isObjCObjectPointerType() 2058 && Old->getType()->isObjCObjectPointerType()) { 2059 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2060 Old->getType()); 2061 } 2062 } else { 2063 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2064 } 2065 if (MergedT.isNull()) { 2066 Diag(New->getLocation(), diag::err_redefinition_different_type) 2067 << New->getDeclName(); 2068 Diag(Old->getLocation(), diag::note_previous_definition); 2069 return New->setInvalidDecl(); 2070 } 2071 New->setType(MergedT); 2072} 2073 2074/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2075/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2076/// situation, merging decls or emitting diagnostics as appropriate. 2077/// 2078/// Tentative definition rules (C99 6.9.2p2) are checked by 2079/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2080/// definitions here, since the initializer hasn't been attached. 2081/// 2082void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2083 // If the new decl is already invalid, don't do any other checking. 2084 if (New->isInvalidDecl()) 2085 return; 2086 2087 // Verify the old decl was also a variable. 2088 VarDecl *Old = 0; 2089 if (!Previous.isSingleResult() || 2090 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2091 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2092 << New->getDeclName(); 2093 Diag(Previous.getRepresentativeDecl()->getLocation(), 2094 diag::note_previous_definition); 2095 return New->setInvalidDecl(); 2096 } 2097 2098 // C++ [class.mem]p1: 2099 // A member shall not be declared twice in the member-specification [...] 2100 // 2101 // Here, we need only consider static data members. 2102 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2103 Diag(New->getLocation(), diag::err_duplicate_member) 2104 << New->getIdentifier(); 2105 Diag(Old->getLocation(), diag::note_previous_declaration); 2106 New->setInvalidDecl(); 2107 } 2108 2109 mergeDeclAttributes(New, Old, Context); 2110 // Warn if an already-declared variable is made a weak_import in a subsequent declaration 2111 if (New->getAttr<WeakImportAttr>() && 2112 Old->getStorageClass() == SC_None && 2113 !Old->getAttr<WeakImportAttr>()) { 2114 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2115 Diag(Old->getLocation(), diag::note_previous_definition); 2116 // Remove weak_import attribute on new declaration. 2117 New->dropAttr<WeakImportAttr>(); 2118 } 2119 2120 // Merge the types. 2121 MergeVarDeclTypes(New, Old); 2122 if (New->isInvalidDecl()) 2123 return; 2124 2125 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2126 if (New->getStorageClass() == SC_Static && 2127 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2128 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2129 Diag(Old->getLocation(), diag::note_previous_definition); 2130 return New->setInvalidDecl(); 2131 } 2132 // C99 6.2.2p4: 2133 // For an identifier declared with the storage-class specifier 2134 // extern in a scope in which a prior declaration of that 2135 // identifier is visible,23) if the prior declaration specifies 2136 // internal or external linkage, the linkage of the identifier at 2137 // the later declaration is the same as the linkage specified at 2138 // the prior declaration. If no prior declaration is visible, or 2139 // if the prior declaration specifies no linkage, then the 2140 // identifier has external linkage. 2141 if (New->hasExternalStorage() && Old->hasLinkage()) 2142 /* Okay */; 2143 else if (New->getStorageClass() != SC_Static && 2144 Old->getStorageClass() == SC_Static) { 2145 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2146 Diag(Old->getLocation(), diag::note_previous_definition); 2147 return New->setInvalidDecl(); 2148 } 2149 2150 // Check if extern is followed by non-extern and vice-versa. 2151 if (New->hasExternalStorage() && 2152 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2153 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2154 Diag(Old->getLocation(), diag::note_previous_definition); 2155 return New->setInvalidDecl(); 2156 } 2157 if (Old->hasExternalStorage() && 2158 !New->hasLinkage() && New->isLocalVarDecl()) { 2159 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2160 Diag(Old->getLocation(), diag::note_previous_definition); 2161 return New->setInvalidDecl(); 2162 } 2163 2164 // __module_private__ is propagated to later declarations. 2165 if (Old->isModulePrivate()) 2166 New->setModulePrivate(); 2167 else if (New->isModulePrivate()) 2168 diagnoseModulePrivateRedeclaration(New, Old); 2169 2170 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2171 2172 // FIXME: The test for external storage here seems wrong? We still 2173 // need to check for mismatches. 2174 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2175 // Don't complain about out-of-line definitions of static members. 2176 !(Old->getLexicalDeclContext()->isRecord() && 2177 !New->getLexicalDeclContext()->isRecord())) { 2178 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2179 Diag(Old->getLocation(), diag::note_previous_definition); 2180 return New->setInvalidDecl(); 2181 } 2182 2183 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2184 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2185 Diag(Old->getLocation(), diag::note_previous_definition); 2186 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2187 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2188 Diag(Old->getLocation(), diag::note_previous_definition); 2189 } 2190 2191 // C++ doesn't have tentative definitions, so go right ahead and check here. 2192 const VarDecl *Def; 2193 if (getLangOptions().CPlusPlus && 2194 New->isThisDeclarationADefinition() == VarDecl::Definition && 2195 (Def = Old->getDefinition())) { 2196 Diag(New->getLocation(), diag::err_redefinition) 2197 << New->getDeclName(); 2198 Diag(Def->getLocation(), diag::note_previous_definition); 2199 New->setInvalidDecl(); 2200 return; 2201 } 2202 // c99 6.2.2 P4. 2203 // For an identifier declared with the storage-class specifier extern in a 2204 // scope in which a prior declaration of that identifier is visible, if 2205 // the prior declaration specifies internal or external linkage, the linkage 2206 // of the identifier at the later declaration is the same as the linkage 2207 // specified at the prior declaration. 2208 // FIXME. revisit this code. 2209 if (New->hasExternalStorage() && 2210 Old->getLinkage() == InternalLinkage && 2211 New->getDeclContext() == Old->getDeclContext()) 2212 New->setStorageClass(Old->getStorageClass()); 2213 2214 // Keep a chain of previous declarations. 2215 New->setPreviousDeclaration(Old); 2216 2217 // Inherit access appropriately. 2218 New->setAccess(Old->getAccess()); 2219} 2220 2221/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2222/// no declarator (e.g. "struct foo;") is parsed. 2223Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2224 DeclSpec &DS) { 2225 return ParsedFreeStandingDeclSpec(S, AS, DS, 2226 MultiTemplateParamsArg(*this, 0, 0)); 2227} 2228 2229/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2230/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2231/// parameters to cope with template friend declarations. 2232Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2233 DeclSpec &DS, 2234 MultiTemplateParamsArg TemplateParams) { 2235 Decl *TagD = 0; 2236 TagDecl *Tag = 0; 2237 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2238 DS.getTypeSpecType() == DeclSpec::TST_struct || 2239 DS.getTypeSpecType() == DeclSpec::TST_union || 2240 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2241 TagD = DS.getRepAsDecl(); 2242 2243 if (!TagD) // We probably had an error 2244 return 0; 2245 2246 // Note that the above type specs guarantee that the 2247 // type rep is a Decl, whereas in many of the others 2248 // it's a Type. 2249 Tag = dyn_cast<TagDecl>(TagD); 2250 } 2251 2252 if (Tag) 2253 Tag->setFreeStanding(); 2254 2255 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2256 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2257 // or incomplete types shall not be restrict-qualified." 2258 if (TypeQuals & DeclSpec::TQ_restrict) 2259 Diag(DS.getRestrictSpecLoc(), 2260 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2261 << DS.getSourceRange(); 2262 } 2263 2264 if (DS.isConstexprSpecified()) { 2265 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2266 // and definitions of functions and variables. 2267 if (Tag) 2268 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2269 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2270 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2271 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2272 else 2273 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2274 // Don't emit warnings after this error. 2275 return TagD; 2276 } 2277 2278 if (DS.isFriendSpecified()) { 2279 // If we're dealing with a decl but not a TagDecl, assume that 2280 // whatever routines created it handled the friendship aspect. 2281 if (TagD && !Tag) 2282 return 0; 2283 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2284 } 2285 2286 // Track whether we warned about the fact that there aren't any 2287 // declarators. 2288 bool emittedWarning = false; 2289 2290 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2291 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2292 2293 if (!Record->getDeclName() && Record->isDefinition() && 2294 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2295 if (getLangOptions().CPlusPlus || 2296 Record->getDeclContext()->isRecord()) 2297 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2298 2299 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2300 << DS.getSourceRange(); 2301 emittedWarning = true; 2302 } 2303 } 2304 2305 // Check for Microsoft C extension: anonymous struct. 2306 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2307 CurContext->isRecord() && 2308 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2309 // Handle 2 kinds of anonymous struct: 2310 // struct STRUCT; 2311 // and 2312 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2313 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2314 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2315 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2316 DS.getRepAsType().get()->isStructureType())) { 2317 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2318 << DS.getSourceRange(); 2319 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2320 } 2321 } 2322 2323 if (getLangOptions().CPlusPlus && 2324 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2325 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2326 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2327 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2328 Diag(Enum->getLocation(), diag::ext_no_declarators) 2329 << DS.getSourceRange(); 2330 emittedWarning = true; 2331 } 2332 2333 // Skip all the checks below if we have a type error. 2334 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2335 2336 if (!DS.isMissingDeclaratorOk()) { 2337 // Warn about typedefs of enums without names, since this is an 2338 // extension in both Microsoft and GNU. 2339 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2340 Tag && isa<EnumDecl>(Tag)) { 2341 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2342 << DS.getSourceRange(); 2343 return Tag; 2344 } 2345 2346 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2347 << DS.getSourceRange(); 2348 emittedWarning = true; 2349 } 2350 2351 // We're going to complain about a bunch of spurious specifiers; 2352 // only do this if we're declaring a tag, because otherwise we 2353 // should be getting diag::ext_no_declarators. 2354 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2355 return TagD; 2356 2357 // Note that a linkage-specification sets a storage class, but 2358 // 'extern "C" struct foo;' is actually valid and not theoretically 2359 // useless. 2360 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2361 if (!DS.isExternInLinkageSpec()) 2362 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2363 << DeclSpec::getSpecifierName(scs); 2364 2365 if (DS.isThreadSpecified()) 2366 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2367 if (DS.getTypeQualifiers()) { 2368 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2369 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2370 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2371 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2372 // Restrict is covered above. 2373 } 2374 if (DS.isInlineSpecified()) 2375 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2376 if (DS.isVirtualSpecified()) 2377 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2378 if (DS.isExplicitSpecified()) 2379 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2380 2381 if (DS.isModulePrivateSpecified() && 2382 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2383 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2384 << Tag->getTagKind() 2385 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2386 2387 // FIXME: Warn on useless attributes 2388 2389 return TagD; 2390} 2391 2392/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2393/// builds a statement for it and returns it so it is evaluated. 2394StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2395 StmtResult R; 2396 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2397 Expr *Exp = DS.getRepAsExpr(); 2398 QualType Ty = Exp->getType(); 2399 if (Ty->isPointerType()) { 2400 do 2401 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2402 while (Ty->isPointerType()); 2403 } 2404 if (Ty->isVariableArrayType()) { 2405 R = ActOnExprStmt(MakeFullExpr(Exp)); 2406 } 2407 } 2408 return R; 2409} 2410 2411/// We are trying to inject an anonymous member into the given scope; 2412/// check if there's an existing declaration that can't be overloaded. 2413/// 2414/// \return true if this is a forbidden redeclaration 2415static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2416 Scope *S, 2417 DeclContext *Owner, 2418 DeclarationName Name, 2419 SourceLocation NameLoc, 2420 unsigned diagnostic) { 2421 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2422 Sema::ForRedeclaration); 2423 if (!SemaRef.LookupName(R, S)) return false; 2424 2425 if (R.getAsSingle<TagDecl>()) 2426 return false; 2427 2428 // Pick a representative declaration. 2429 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2430 assert(PrevDecl && "Expected a non-null Decl"); 2431 2432 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2433 return false; 2434 2435 SemaRef.Diag(NameLoc, diagnostic) << Name; 2436 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2437 2438 return true; 2439} 2440 2441/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2442/// anonymous struct or union AnonRecord into the owning context Owner 2443/// and scope S. This routine will be invoked just after we realize 2444/// that an unnamed union or struct is actually an anonymous union or 2445/// struct, e.g., 2446/// 2447/// @code 2448/// union { 2449/// int i; 2450/// float f; 2451/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2452/// // f into the surrounding scope.x 2453/// @endcode 2454/// 2455/// This routine is recursive, injecting the names of nested anonymous 2456/// structs/unions into the owning context and scope as well. 2457static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2458 DeclContext *Owner, 2459 RecordDecl *AnonRecord, 2460 AccessSpecifier AS, 2461 SmallVector<NamedDecl*, 2> &Chaining, 2462 bool MSAnonStruct) { 2463 unsigned diagKind 2464 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2465 : diag::err_anonymous_struct_member_redecl; 2466 2467 bool Invalid = false; 2468 2469 // Look every FieldDecl and IndirectFieldDecl with a name. 2470 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2471 DEnd = AnonRecord->decls_end(); 2472 D != DEnd; ++D) { 2473 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2474 cast<NamedDecl>(*D)->getDeclName()) { 2475 ValueDecl *VD = cast<ValueDecl>(*D); 2476 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2477 VD->getLocation(), diagKind)) { 2478 // C++ [class.union]p2: 2479 // The names of the members of an anonymous union shall be 2480 // distinct from the names of any other entity in the 2481 // scope in which the anonymous union is declared. 2482 Invalid = true; 2483 } else { 2484 // C++ [class.union]p2: 2485 // For the purpose of name lookup, after the anonymous union 2486 // definition, the members of the anonymous union are 2487 // considered to have been defined in the scope in which the 2488 // anonymous union is declared. 2489 unsigned OldChainingSize = Chaining.size(); 2490 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2491 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2492 PE = IF->chain_end(); PI != PE; ++PI) 2493 Chaining.push_back(*PI); 2494 else 2495 Chaining.push_back(VD); 2496 2497 assert(Chaining.size() >= 2); 2498 NamedDecl **NamedChain = 2499 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2500 for (unsigned i = 0; i < Chaining.size(); i++) 2501 NamedChain[i] = Chaining[i]; 2502 2503 IndirectFieldDecl* IndirectField = 2504 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2505 VD->getIdentifier(), VD->getType(), 2506 NamedChain, Chaining.size()); 2507 2508 IndirectField->setAccess(AS); 2509 IndirectField->setImplicit(); 2510 SemaRef.PushOnScopeChains(IndirectField, S); 2511 2512 // That includes picking up the appropriate access specifier. 2513 if (AS != AS_none) IndirectField->setAccess(AS); 2514 2515 Chaining.resize(OldChainingSize); 2516 } 2517 } 2518 } 2519 2520 return Invalid; 2521} 2522 2523/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2524/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2525/// illegal input values are mapped to SC_None. 2526static StorageClass 2527StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2528 switch (StorageClassSpec) { 2529 case DeclSpec::SCS_unspecified: return SC_None; 2530 case DeclSpec::SCS_extern: return SC_Extern; 2531 case DeclSpec::SCS_static: return SC_Static; 2532 case DeclSpec::SCS_auto: return SC_Auto; 2533 case DeclSpec::SCS_register: return SC_Register; 2534 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2535 // Illegal SCSs map to None: error reporting is up to the caller. 2536 case DeclSpec::SCS_mutable: // Fall through. 2537 case DeclSpec::SCS_typedef: return SC_None; 2538 } 2539 llvm_unreachable("unknown storage class specifier"); 2540} 2541 2542/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2543/// a StorageClass. Any error reporting is up to the caller: 2544/// illegal input values are mapped to SC_None. 2545static StorageClass 2546StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2547 switch (StorageClassSpec) { 2548 case DeclSpec::SCS_unspecified: return SC_None; 2549 case DeclSpec::SCS_extern: return SC_Extern; 2550 case DeclSpec::SCS_static: return SC_Static; 2551 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2552 // Illegal SCSs map to None: error reporting is up to the caller. 2553 case DeclSpec::SCS_auto: // Fall through. 2554 case DeclSpec::SCS_mutable: // Fall through. 2555 case DeclSpec::SCS_register: // Fall through. 2556 case DeclSpec::SCS_typedef: return SC_None; 2557 } 2558 llvm_unreachable("unknown storage class specifier"); 2559} 2560 2561/// BuildAnonymousStructOrUnion - Handle the declaration of an 2562/// anonymous structure or union. Anonymous unions are a C++ feature 2563/// (C++ [class.union]) and a GNU C extension; anonymous structures 2564/// are a GNU C and GNU C++ extension. 2565Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2566 AccessSpecifier AS, 2567 RecordDecl *Record) { 2568 DeclContext *Owner = Record->getDeclContext(); 2569 2570 // Diagnose whether this anonymous struct/union is an extension. 2571 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2572 Diag(Record->getLocation(), diag::ext_anonymous_union); 2573 else if (!Record->isUnion()) 2574 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2575 2576 // C and C++ require different kinds of checks for anonymous 2577 // structs/unions. 2578 bool Invalid = false; 2579 if (getLangOptions().CPlusPlus) { 2580 const char* PrevSpec = 0; 2581 unsigned DiagID; 2582 // C++ [class.union]p3: 2583 // Anonymous unions declared in a named namespace or in the 2584 // global namespace shall be declared static. 2585 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2586 (isa<TranslationUnitDecl>(Owner) || 2587 (isa<NamespaceDecl>(Owner) && 2588 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2589 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2590 Invalid = true; 2591 2592 // Recover by adding 'static'. 2593 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2594 PrevSpec, DiagID, getLangOptions()); 2595 } 2596 // C++ [class.union]p3: 2597 // A storage class is not allowed in a declaration of an 2598 // anonymous union in a class scope. 2599 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2600 isa<RecordDecl>(Owner)) { 2601 Diag(DS.getStorageClassSpecLoc(), 2602 diag::err_anonymous_union_with_storage_spec); 2603 Invalid = true; 2604 2605 // Recover by removing the storage specifier. 2606 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2607 PrevSpec, DiagID, getLangOptions()); 2608 } 2609 2610 // Ignore const/volatile/restrict qualifiers. 2611 if (DS.getTypeQualifiers()) { 2612 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2613 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2614 << Record->isUnion() << 0 2615 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2616 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2617 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2618 << Record->isUnion() << 1 2619 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2620 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2621 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2622 << Record->isUnion() << 2 2623 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2624 2625 DS.ClearTypeQualifiers(); 2626 } 2627 2628 // C++ [class.union]p2: 2629 // The member-specification of an anonymous union shall only 2630 // define non-static data members. [Note: nested types and 2631 // functions cannot be declared within an anonymous union. ] 2632 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2633 MemEnd = Record->decls_end(); 2634 Mem != MemEnd; ++Mem) { 2635 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2636 // C++ [class.union]p3: 2637 // An anonymous union shall not have private or protected 2638 // members (clause 11). 2639 assert(FD->getAccess() != AS_none); 2640 if (FD->getAccess() != AS_public) { 2641 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2642 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2643 Invalid = true; 2644 } 2645 2646 // C++ [class.union]p1 2647 // An object of a class with a non-trivial constructor, a non-trivial 2648 // copy constructor, a non-trivial destructor, or a non-trivial copy 2649 // assignment operator cannot be a member of a union, nor can an 2650 // array of such objects. 2651 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2652 Invalid = true; 2653 } else if ((*Mem)->isImplicit()) { 2654 // Any implicit members are fine. 2655 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2656 // This is a type that showed up in an 2657 // elaborated-type-specifier inside the anonymous struct or 2658 // union, but which actually declares a type outside of the 2659 // anonymous struct or union. It's okay. 2660 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2661 if (!MemRecord->isAnonymousStructOrUnion() && 2662 MemRecord->getDeclName()) { 2663 // Visual C++ allows type definition in anonymous struct or union. 2664 if (getLangOptions().MicrosoftExt) 2665 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2666 << (int)Record->isUnion(); 2667 else { 2668 // This is a nested type declaration. 2669 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2670 << (int)Record->isUnion(); 2671 Invalid = true; 2672 } 2673 } 2674 } else if (isa<AccessSpecDecl>(*Mem)) { 2675 // Any access specifier is fine. 2676 } else { 2677 // We have something that isn't a non-static data 2678 // member. Complain about it. 2679 unsigned DK = diag::err_anonymous_record_bad_member; 2680 if (isa<TypeDecl>(*Mem)) 2681 DK = diag::err_anonymous_record_with_type; 2682 else if (isa<FunctionDecl>(*Mem)) 2683 DK = diag::err_anonymous_record_with_function; 2684 else if (isa<VarDecl>(*Mem)) 2685 DK = diag::err_anonymous_record_with_static; 2686 2687 // Visual C++ allows type definition in anonymous struct or union. 2688 if (getLangOptions().MicrosoftExt && 2689 DK == diag::err_anonymous_record_with_type) 2690 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2691 << (int)Record->isUnion(); 2692 else { 2693 Diag((*Mem)->getLocation(), DK) 2694 << (int)Record->isUnion(); 2695 Invalid = true; 2696 } 2697 } 2698 } 2699 } 2700 2701 if (!Record->isUnion() && !Owner->isRecord()) { 2702 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2703 << (int)getLangOptions().CPlusPlus; 2704 Invalid = true; 2705 } 2706 2707 // Mock up a declarator. 2708 Declarator Dc(DS, Declarator::MemberContext); 2709 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2710 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2711 2712 // Create a declaration for this anonymous struct/union. 2713 NamedDecl *Anon = 0; 2714 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2715 Anon = FieldDecl::Create(Context, OwningClass, 2716 DS.getSourceRange().getBegin(), 2717 Record->getLocation(), 2718 /*IdentifierInfo=*/0, 2719 Context.getTypeDeclType(Record), 2720 TInfo, 2721 /*BitWidth=*/0, /*Mutable=*/false, 2722 /*HasInit=*/false); 2723 Anon->setAccess(AS); 2724 if (getLangOptions().CPlusPlus) 2725 FieldCollector->Add(cast<FieldDecl>(Anon)); 2726 } else { 2727 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2728 assert(SCSpec != DeclSpec::SCS_typedef && 2729 "Parser allowed 'typedef' as storage class VarDecl."); 2730 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2731 if (SCSpec == DeclSpec::SCS_mutable) { 2732 // mutable can only appear on non-static class members, so it's always 2733 // an error here 2734 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2735 Invalid = true; 2736 SC = SC_None; 2737 } 2738 SCSpec = DS.getStorageClassSpecAsWritten(); 2739 VarDecl::StorageClass SCAsWritten 2740 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2741 2742 Anon = VarDecl::Create(Context, Owner, 2743 DS.getSourceRange().getBegin(), 2744 Record->getLocation(), /*IdentifierInfo=*/0, 2745 Context.getTypeDeclType(Record), 2746 TInfo, SC, SCAsWritten); 2747 2748 // Default-initialize the implicit variable. This initialization will be 2749 // trivial in almost all cases, except if a union member has an in-class 2750 // initializer: 2751 // union { int n = 0; }; 2752 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2753 } 2754 Anon->setImplicit(); 2755 2756 // Add the anonymous struct/union object to the current 2757 // context. We'll be referencing this object when we refer to one of 2758 // its members. 2759 Owner->addDecl(Anon); 2760 2761 // Inject the members of the anonymous struct/union into the owning 2762 // context and into the identifier resolver chain for name lookup 2763 // purposes. 2764 SmallVector<NamedDecl*, 2> Chain; 2765 Chain.push_back(Anon); 2766 2767 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2768 Chain, false)) 2769 Invalid = true; 2770 2771 // Mark this as an anonymous struct/union type. Note that we do not 2772 // do this until after we have already checked and injected the 2773 // members of this anonymous struct/union type, because otherwise 2774 // the members could be injected twice: once by DeclContext when it 2775 // builds its lookup table, and once by 2776 // InjectAnonymousStructOrUnionMembers. 2777 Record->setAnonymousStructOrUnion(true); 2778 2779 if (Invalid) 2780 Anon->setInvalidDecl(); 2781 2782 return Anon; 2783} 2784 2785/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2786/// Microsoft C anonymous structure. 2787/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2788/// Example: 2789/// 2790/// struct A { int a; }; 2791/// struct B { struct A; int b; }; 2792/// 2793/// void foo() { 2794/// B var; 2795/// var.a = 3; 2796/// } 2797/// 2798Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2799 RecordDecl *Record) { 2800 2801 // If there is no Record, get the record via the typedef. 2802 if (!Record) 2803 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2804 2805 // Mock up a declarator. 2806 Declarator Dc(DS, Declarator::TypeNameContext); 2807 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2808 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2809 2810 // Create a declaration for this anonymous struct. 2811 NamedDecl* Anon = FieldDecl::Create(Context, 2812 cast<RecordDecl>(CurContext), 2813 DS.getSourceRange().getBegin(), 2814 DS.getSourceRange().getBegin(), 2815 /*IdentifierInfo=*/0, 2816 Context.getTypeDeclType(Record), 2817 TInfo, 2818 /*BitWidth=*/0, /*Mutable=*/false, 2819 /*HasInit=*/false); 2820 Anon->setImplicit(); 2821 2822 // Add the anonymous struct object to the current context. 2823 CurContext->addDecl(Anon); 2824 2825 // Inject the members of the anonymous struct into the current 2826 // context and into the identifier resolver chain for name lookup 2827 // purposes. 2828 SmallVector<NamedDecl*, 2> Chain; 2829 Chain.push_back(Anon); 2830 2831 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2832 Record->getDefinition(), 2833 AS_none, Chain, true)) 2834 Anon->setInvalidDecl(); 2835 2836 return Anon; 2837} 2838 2839/// GetNameForDeclarator - Determine the full declaration name for the 2840/// given Declarator. 2841DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2842 return GetNameFromUnqualifiedId(D.getName()); 2843} 2844 2845/// \brief Retrieves the declaration name from a parsed unqualified-id. 2846DeclarationNameInfo 2847Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2848 DeclarationNameInfo NameInfo; 2849 NameInfo.setLoc(Name.StartLocation); 2850 2851 switch (Name.getKind()) { 2852 2853 case UnqualifiedId::IK_ImplicitSelfParam: 2854 case UnqualifiedId::IK_Identifier: 2855 NameInfo.setName(Name.Identifier); 2856 NameInfo.setLoc(Name.StartLocation); 2857 return NameInfo; 2858 2859 case UnqualifiedId::IK_OperatorFunctionId: 2860 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2861 Name.OperatorFunctionId.Operator)); 2862 NameInfo.setLoc(Name.StartLocation); 2863 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2864 = Name.OperatorFunctionId.SymbolLocations[0]; 2865 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2866 = Name.EndLocation.getRawEncoding(); 2867 return NameInfo; 2868 2869 case UnqualifiedId::IK_LiteralOperatorId: 2870 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2871 Name.Identifier)); 2872 NameInfo.setLoc(Name.StartLocation); 2873 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2874 return NameInfo; 2875 2876 case UnqualifiedId::IK_ConversionFunctionId: { 2877 TypeSourceInfo *TInfo; 2878 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2879 if (Ty.isNull()) 2880 return DeclarationNameInfo(); 2881 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2882 Context.getCanonicalType(Ty))); 2883 NameInfo.setLoc(Name.StartLocation); 2884 NameInfo.setNamedTypeInfo(TInfo); 2885 return NameInfo; 2886 } 2887 2888 case UnqualifiedId::IK_ConstructorName: { 2889 TypeSourceInfo *TInfo; 2890 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2891 if (Ty.isNull()) 2892 return DeclarationNameInfo(); 2893 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2894 Context.getCanonicalType(Ty))); 2895 NameInfo.setLoc(Name.StartLocation); 2896 NameInfo.setNamedTypeInfo(TInfo); 2897 return NameInfo; 2898 } 2899 2900 case UnqualifiedId::IK_ConstructorTemplateId: { 2901 // In well-formed code, we can only have a constructor 2902 // template-id that refers to the current context, so go there 2903 // to find the actual type being constructed. 2904 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2905 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2906 return DeclarationNameInfo(); 2907 2908 // Determine the type of the class being constructed. 2909 QualType CurClassType = Context.getTypeDeclType(CurClass); 2910 2911 // FIXME: Check two things: that the template-id names the same type as 2912 // CurClassType, and that the template-id does not occur when the name 2913 // was qualified. 2914 2915 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2916 Context.getCanonicalType(CurClassType))); 2917 NameInfo.setLoc(Name.StartLocation); 2918 // FIXME: should we retrieve TypeSourceInfo? 2919 NameInfo.setNamedTypeInfo(0); 2920 return NameInfo; 2921 } 2922 2923 case UnqualifiedId::IK_DestructorName: { 2924 TypeSourceInfo *TInfo; 2925 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2926 if (Ty.isNull()) 2927 return DeclarationNameInfo(); 2928 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2929 Context.getCanonicalType(Ty))); 2930 NameInfo.setLoc(Name.StartLocation); 2931 NameInfo.setNamedTypeInfo(TInfo); 2932 return NameInfo; 2933 } 2934 2935 case UnqualifiedId::IK_TemplateId: { 2936 TemplateName TName = Name.TemplateId->Template.get(); 2937 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2938 return Context.getNameForTemplate(TName, TNameLoc); 2939 } 2940 2941 } // switch (Name.getKind()) 2942 2943 llvm_unreachable("Unknown name kind"); 2944} 2945 2946static QualType getCoreType(QualType Ty) { 2947 do { 2948 if (Ty->isPointerType() || Ty->isReferenceType()) 2949 Ty = Ty->getPointeeType(); 2950 else if (Ty->isArrayType()) 2951 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 2952 else 2953 return Ty.withoutLocalFastQualifiers(); 2954 } while (true); 2955} 2956 2957/// isNearlyMatchingFunction - Determine whether the C++ functions 2958/// Declaration and Definition are "nearly" matching. This heuristic 2959/// is used to improve diagnostics in the case where an out-of-line 2960/// function definition doesn't match any declaration within the class 2961/// or namespace. Also sets Params to the list of indices to the 2962/// parameters that differ between the declaration and the definition. 2963static bool isNearlyMatchingFunction(ASTContext &Context, 2964 FunctionDecl *Declaration, 2965 FunctionDecl *Definition, 2966 llvm::SmallVectorImpl<unsigned> &Params) { 2967 Params.clear(); 2968 if (Declaration->param_size() != Definition->param_size()) 2969 return false; 2970 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2971 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2972 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2973 2974 // The parameter types are identical 2975 if (Context.hasSameType(DefParamTy, DeclParamTy)) 2976 continue; 2977 2978 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 2979 QualType DefParamBaseTy = getCoreType(DefParamTy); 2980 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 2981 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 2982 2983 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 2984 (DeclTyName && DeclTyName == DefTyName)) 2985 Params.push_back(Idx); 2986 else // The two parameters aren't even close 2987 return false; 2988 } 2989 2990 return true; 2991} 2992 2993/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2994/// declarator needs to be rebuilt in the current instantiation. 2995/// Any bits of declarator which appear before the name are valid for 2996/// consideration here. That's specifically the type in the decl spec 2997/// and the base type in any member-pointer chunks. 2998static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2999 DeclarationName Name) { 3000 // The types we specifically need to rebuild are: 3001 // - typenames, typeofs, and decltypes 3002 // - types which will become injected class names 3003 // Of course, we also need to rebuild any type referencing such a 3004 // type. It's safest to just say "dependent", but we call out a 3005 // few cases here. 3006 3007 DeclSpec &DS = D.getMutableDeclSpec(); 3008 switch (DS.getTypeSpecType()) { 3009 case DeclSpec::TST_typename: 3010 case DeclSpec::TST_typeofType: 3011 case DeclSpec::TST_decltype: 3012 case DeclSpec::TST_underlyingType: { 3013 // Grab the type from the parser. 3014 TypeSourceInfo *TSI = 0; 3015 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3016 if (T.isNull() || !T->isDependentType()) break; 3017 3018 // Make sure there's a type source info. This isn't really much 3019 // of a waste; most dependent types should have type source info 3020 // attached already. 3021 if (!TSI) 3022 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3023 3024 // Rebuild the type in the current instantiation. 3025 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3026 if (!TSI) return true; 3027 3028 // Store the new type back in the decl spec. 3029 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3030 DS.UpdateTypeRep(LocType); 3031 break; 3032 } 3033 3034 case DeclSpec::TST_typeofExpr: { 3035 Expr *E = DS.getRepAsExpr(); 3036 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3037 if (Result.isInvalid()) return true; 3038 DS.UpdateExprRep(Result.get()); 3039 break; 3040 } 3041 3042 default: 3043 // Nothing to do for these decl specs. 3044 break; 3045 } 3046 3047 // It doesn't matter what order we do this in. 3048 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3049 DeclaratorChunk &Chunk = D.getTypeObject(I); 3050 3051 // The only type information in the declarator which can come 3052 // before the declaration name is the base type of a member 3053 // pointer. 3054 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3055 continue; 3056 3057 // Rebuild the scope specifier in-place. 3058 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3059 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3060 return true; 3061 } 3062 3063 return false; 3064} 3065 3066Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3067 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 3068 /*IsFunctionDefinition=*/false); 3069} 3070 3071/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3072/// If T is the name of a class, then each of the following shall have a 3073/// name different from T: 3074/// - every static data member of class T; 3075/// - every member function of class T 3076/// - every member of class T that is itself a type; 3077/// \returns true if the declaration name violates these rules. 3078bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3079 DeclarationNameInfo NameInfo) { 3080 DeclarationName Name = NameInfo.getName(); 3081 3082 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3083 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3084 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3085 return true; 3086 } 3087 3088 return false; 3089} 3090 3091Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3092 MultiTemplateParamsArg TemplateParamLists, 3093 bool IsFunctionDefinition) { 3094 // TODO: consider using NameInfo for diagnostic. 3095 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3096 DeclarationName Name = NameInfo.getName(); 3097 3098 // All of these full declarators require an identifier. If it doesn't have 3099 // one, the ParsedFreeStandingDeclSpec action should be used. 3100 if (!Name) { 3101 if (!D.isInvalidType()) // Reject this if we think it is valid. 3102 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3103 diag::err_declarator_need_ident) 3104 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3105 return 0; 3106 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3107 return 0; 3108 3109 // The scope passed in may not be a decl scope. Zip up the scope tree until 3110 // we find one that is. 3111 while ((S->getFlags() & Scope::DeclScope) == 0 || 3112 (S->getFlags() & Scope::TemplateParamScope) != 0) 3113 S = S->getParent(); 3114 3115 DeclContext *DC = CurContext; 3116 if (D.getCXXScopeSpec().isInvalid()) 3117 D.setInvalidType(); 3118 else if (D.getCXXScopeSpec().isSet()) { 3119 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3120 UPPC_DeclarationQualifier)) 3121 return 0; 3122 3123 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3124 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3125 if (!DC) { 3126 // If we could not compute the declaration context, it's because the 3127 // declaration context is dependent but does not refer to a class, 3128 // class template, or class template partial specialization. Complain 3129 // and return early, to avoid the coming semantic disaster. 3130 Diag(D.getIdentifierLoc(), 3131 diag::err_template_qualified_declarator_no_match) 3132 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3133 << D.getCXXScopeSpec().getRange(); 3134 return 0; 3135 } 3136 bool IsDependentContext = DC->isDependentContext(); 3137 3138 if (!IsDependentContext && 3139 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3140 return 0; 3141 3142 if (isa<CXXRecordDecl>(DC)) { 3143 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3144 Diag(D.getIdentifierLoc(), 3145 diag::err_member_def_undefined_record) 3146 << Name << DC << D.getCXXScopeSpec().getRange(); 3147 D.setInvalidType(); 3148 } else if (isa<CXXRecordDecl>(CurContext) && 3149 !D.getDeclSpec().isFriendSpecified()) { 3150 // The user provided a superfluous scope specifier inside a class 3151 // definition: 3152 // 3153 // class X { 3154 // void X::f(); 3155 // }; 3156 if (CurContext->Equals(DC)) 3157 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3158 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3159 else 3160 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3161 << Name << D.getCXXScopeSpec().getRange(); 3162 3163 // Pretend that this qualifier was not here. 3164 D.getCXXScopeSpec().clear(); 3165 } 3166 } 3167 3168 // Check whether we need to rebuild the type of the given 3169 // declaration in the current instantiation. 3170 if (EnteringContext && IsDependentContext && 3171 TemplateParamLists.size() != 0) { 3172 ContextRAII SavedContext(*this, DC); 3173 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3174 D.setInvalidType(); 3175 } 3176 } 3177 3178 if (DiagnoseClassNameShadow(DC, NameInfo)) 3179 // If this is a typedef, we'll end up spewing multiple diagnostics. 3180 // Just return early; it's safer. 3181 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3182 return 0; 3183 3184 NamedDecl *New; 3185 3186 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3187 QualType R = TInfo->getType(); 3188 3189 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3190 UPPC_DeclarationType)) 3191 D.setInvalidType(); 3192 3193 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3194 ForRedeclaration); 3195 3196 // See if this is a redefinition of a variable in the same scope. 3197 if (!D.getCXXScopeSpec().isSet()) { 3198 bool IsLinkageLookup = false; 3199 3200 // If the declaration we're planning to build will be a function 3201 // or object with linkage, then look for another declaration with 3202 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3203 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3204 /* Do nothing*/; 3205 else if (R->isFunctionType()) { 3206 if (CurContext->isFunctionOrMethod() || 3207 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3208 IsLinkageLookup = true; 3209 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3210 IsLinkageLookup = true; 3211 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3212 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3213 IsLinkageLookup = true; 3214 3215 if (IsLinkageLookup) 3216 Previous.clear(LookupRedeclarationWithLinkage); 3217 3218 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3219 } else { // Something like "int foo::x;" 3220 LookupQualifiedName(Previous, DC); 3221 3222 // Don't consider using declarations as previous declarations for 3223 // out-of-line members. 3224 RemoveUsingDecls(Previous); 3225 3226 // C++ 7.3.1.2p2: 3227 // Members (including explicit specializations of templates) of a named 3228 // namespace can also be defined outside that namespace by explicit 3229 // qualification of the name being defined, provided that the entity being 3230 // defined was already declared in the namespace and the definition appears 3231 // after the point of declaration in a namespace that encloses the 3232 // declarations namespace. 3233 // 3234 // Note that we only check the context at this point. We don't yet 3235 // have enough information to make sure that PrevDecl is actually 3236 // the declaration we want to match. For example, given: 3237 // 3238 // class X { 3239 // void f(); 3240 // void f(float); 3241 // }; 3242 // 3243 // void X::f(int) { } // ill-formed 3244 // 3245 // In this case, PrevDecl will point to the overload set 3246 // containing the two f's declared in X, but neither of them 3247 // matches. 3248 3249 // First check whether we named the global scope. 3250 if (isa<TranslationUnitDecl>(DC)) { 3251 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3252 << Name << D.getCXXScopeSpec().getRange(); 3253 } else { 3254 DeclContext *Cur = CurContext; 3255 while (isa<LinkageSpecDecl>(Cur)) 3256 Cur = Cur->getParent(); 3257 if (!Cur->Encloses(DC)) { 3258 // The qualifying scope doesn't enclose the original declaration. 3259 // Emit diagnostic based on current scope. 3260 SourceLocation L = D.getIdentifierLoc(); 3261 SourceRange R = D.getCXXScopeSpec().getRange(); 3262 if (isa<FunctionDecl>(Cur)) 3263 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3264 else 3265 Diag(L, diag::err_invalid_declarator_scope) 3266 << Name << cast<NamedDecl>(DC) << R; 3267 D.setInvalidType(); 3268 } 3269 } 3270 } 3271 3272 if (Previous.isSingleResult() && 3273 Previous.getFoundDecl()->isTemplateParameter()) { 3274 // Maybe we will complain about the shadowed template parameter. 3275 if (!D.isInvalidType()) 3276 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3277 Previous.getFoundDecl())) 3278 D.setInvalidType(); 3279 3280 // Just pretend that we didn't see the previous declaration. 3281 Previous.clear(); 3282 } 3283 3284 // In C++, the previous declaration we find might be a tag type 3285 // (class or enum). In this case, the new declaration will hide the 3286 // tag type. Note that this does does not apply if we're declaring a 3287 // typedef (C++ [dcl.typedef]p4). 3288 if (Previous.isSingleTagDecl() && 3289 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3290 Previous.clear(); 3291 3292 bool Redeclaration = false; 3293 bool AddToScope = true; 3294 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3295 if (TemplateParamLists.size()) { 3296 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3297 return 0; 3298 } 3299 3300 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3301 } else if (R->isFunctionType()) { 3302 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3303 move(TemplateParamLists), 3304 IsFunctionDefinition, Redeclaration, 3305 AddToScope); 3306 } else { 3307 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3308 move(TemplateParamLists), 3309 Redeclaration); 3310 } 3311 3312 if (New == 0) 3313 return 0; 3314 3315 // If this has an identifier and is not an invalid redeclaration or 3316 // function template specialization, add it to the scope stack. 3317 if (New->getDeclName() && AddToScope && 3318 !(Redeclaration && New->isInvalidDecl())) 3319 PushOnScopeChains(New, S); 3320 3321 return New; 3322} 3323 3324/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3325/// types into constant array types in certain situations which would otherwise 3326/// be errors (for GCC compatibility). 3327static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3328 ASTContext &Context, 3329 bool &SizeIsNegative, 3330 llvm::APSInt &Oversized) { 3331 // This method tries to turn a variable array into a constant 3332 // array even when the size isn't an ICE. This is necessary 3333 // for compatibility with code that depends on gcc's buggy 3334 // constant expression folding, like struct {char x[(int)(char*)2];} 3335 SizeIsNegative = false; 3336 Oversized = 0; 3337 3338 if (T->isDependentType()) 3339 return QualType(); 3340 3341 QualifierCollector Qs; 3342 const Type *Ty = Qs.strip(T); 3343 3344 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3345 QualType Pointee = PTy->getPointeeType(); 3346 QualType FixedType = 3347 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3348 Oversized); 3349 if (FixedType.isNull()) return FixedType; 3350 FixedType = Context.getPointerType(FixedType); 3351 return Qs.apply(Context, FixedType); 3352 } 3353 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3354 QualType Inner = PTy->getInnerType(); 3355 QualType FixedType = 3356 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3357 Oversized); 3358 if (FixedType.isNull()) return FixedType; 3359 FixedType = Context.getParenType(FixedType); 3360 return Qs.apply(Context, FixedType); 3361 } 3362 3363 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3364 if (!VLATy) 3365 return QualType(); 3366 // FIXME: We should probably handle this case 3367 if (VLATy->getElementType()->isVariablyModifiedType()) 3368 return QualType(); 3369 3370 Expr::EvalResult EvalResult; 3371 if (!VLATy->getSizeExpr() || 3372 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3373 !EvalResult.Val.isInt()) 3374 return QualType(); 3375 3376 // Check whether the array size is negative. 3377 llvm::APSInt &Res = EvalResult.Val.getInt(); 3378 if (Res.isSigned() && Res.isNegative()) { 3379 SizeIsNegative = true; 3380 return QualType(); 3381 } 3382 3383 // Check whether the array is too large to be addressed. 3384 unsigned ActiveSizeBits 3385 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3386 Res); 3387 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3388 Oversized = Res; 3389 return QualType(); 3390 } 3391 3392 return Context.getConstantArrayType(VLATy->getElementType(), 3393 Res, ArrayType::Normal, 0); 3394} 3395 3396/// \brief Register the given locally-scoped external C declaration so 3397/// that it can be found later for redeclarations 3398void 3399Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3400 const LookupResult &Previous, 3401 Scope *S) { 3402 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3403 "Decl is not a locally-scoped decl!"); 3404 // Note that we have a locally-scoped external with this name. 3405 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3406 3407 if (!Previous.isSingleResult()) 3408 return; 3409 3410 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3411 3412 // If there was a previous declaration of this variable, it may be 3413 // in our identifier chain. Update the identifier chain with the new 3414 // declaration. 3415 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3416 // The previous declaration was found on the identifer resolver 3417 // chain, so remove it from its scope. 3418 3419 if (S->isDeclScope(PrevDecl)) { 3420 // Special case for redeclarations in the SAME scope. 3421 // Because this declaration is going to be added to the identifier chain 3422 // later, we should temporarily take it OFF the chain. 3423 IdResolver.RemoveDecl(ND); 3424 3425 } else { 3426 // Find the scope for the original declaration. 3427 while (S && !S->isDeclScope(PrevDecl)) 3428 S = S->getParent(); 3429 } 3430 3431 if (S) 3432 S->RemoveDecl(PrevDecl); 3433 } 3434} 3435 3436llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3437Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3438 if (ExternalSource) { 3439 // Load locally-scoped external decls from the external source. 3440 SmallVector<NamedDecl *, 4> Decls; 3441 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3442 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3443 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3444 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3445 if (Pos == LocallyScopedExternalDecls.end()) 3446 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3447 } 3448 } 3449 3450 return LocallyScopedExternalDecls.find(Name); 3451} 3452 3453/// \brief Diagnose function specifiers on a declaration of an identifier that 3454/// does not identify a function. 3455void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3456 // FIXME: We should probably indicate the identifier in question to avoid 3457 // confusion for constructs like "inline int a(), b;" 3458 if (D.getDeclSpec().isInlineSpecified()) 3459 Diag(D.getDeclSpec().getInlineSpecLoc(), 3460 diag::err_inline_non_function); 3461 3462 if (D.getDeclSpec().isVirtualSpecified()) 3463 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3464 diag::err_virtual_non_function); 3465 3466 if (D.getDeclSpec().isExplicitSpecified()) 3467 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3468 diag::err_explicit_non_function); 3469} 3470 3471NamedDecl* 3472Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3473 QualType R, TypeSourceInfo *TInfo, 3474 LookupResult &Previous, bool &Redeclaration) { 3475 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3476 if (D.getCXXScopeSpec().isSet()) { 3477 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3478 << D.getCXXScopeSpec().getRange(); 3479 D.setInvalidType(); 3480 // Pretend we didn't see the scope specifier. 3481 DC = CurContext; 3482 Previous.clear(); 3483 } 3484 3485 if (getLangOptions().CPlusPlus) { 3486 // Check that there are no default arguments (C++ only). 3487 CheckExtraCXXDefaultArguments(D); 3488 } 3489 3490 DiagnoseFunctionSpecifiers(D); 3491 3492 if (D.getDeclSpec().isThreadSpecified()) 3493 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3494 if (D.getDeclSpec().isConstexprSpecified()) 3495 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3496 << 1; 3497 3498 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3499 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3500 << D.getName().getSourceRange(); 3501 return 0; 3502 } 3503 3504 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3505 if (!NewTD) return 0; 3506 3507 // Handle attributes prior to checking for duplicates in MergeVarDecl 3508 ProcessDeclAttributes(S, NewTD, D); 3509 3510 CheckTypedefForVariablyModifiedType(S, NewTD); 3511 3512 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3513} 3514 3515void 3516Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3517 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3518 // then it shall have block scope. 3519 // Note that variably modified types must be fixed before merging the decl so 3520 // that redeclarations will match. 3521 QualType T = NewTD->getUnderlyingType(); 3522 if (T->isVariablyModifiedType()) { 3523 getCurFunction()->setHasBranchProtectedScope(); 3524 3525 if (S->getFnParent() == 0) { 3526 bool SizeIsNegative; 3527 llvm::APSInt Oversized; 3528 QualType FixedTy = 3529 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3530 Oversized); 3531 if (!FixedTy.isNull()) { 3532 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3533 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3534 } else { 3535 if (SizeIsNegative) 3536 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3537 else if (T->isVariableArrayType()) 3538 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3539 else if (Oversized.getBoolValue()) 3540 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3541 else 3542 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3543 NewTD->setInvalidDecl(); 3544 } 3545 } 3546 } 3547} 3548 3549 3550/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3551/// declares a typedef-name, either using the 'typedef' type specifier or via 3552/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3553NamedDecl* 3554Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3555 LookupResult &Previous, bool &Redeclaration) { 3556 // Merge the decl with the existing one if appropriate. If the decl is 3557 // in an outer scope, it isn't the same thing. 3558 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3559 /*ExplicitInstantiationOrSpecialization=*/false); 3560 if (!Previous.empty()) { 3561 Redeclaration = true; 3562 MergeTypedefNameDecl(NewTD, Previous); 3563 } 3564 3565 // If this is the C FILE type, notify the AST context. 3566 if (IdentifierInfo *II = NewTD->getIdentifier()) 3567 if (!NewTD->isInvalidDecl() && 3568 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3569 if (II->isStr("FILE")) 3570 Context.setFILEDecl(NewTD); 3571 else if (II->isStr("jmp_buf")) 3572 Context.setjmp_bufDecl(NewTD); 3573 else if (II->isStr("sigjmp_buf")) 3574 Context.setsigjmp_bufDecl(NewTD); 3575 else if (II->isStr("__builtin_va_list")) 3576 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3577 } 3578 3579 return NewTD; 3580} 3581 3582/// \brief Determines whether the given declaration is an out-of-scope 3583/// previous declaration. 3584/// 3585/// This routine should be invoked when name lookup has found a 3586/// previous declaration (PrevDecl) that is not in the scope where a 3587/// new declaration by the same name is being introduced. If the new 3588/// declaration occurs in a local scope, previous declarations with 3589/// linkage may still be considered previous declarations (C99 3590/// 6.2.2p4-5, C++ [basic.link]p6). 3591/// 3592/// \param PrevDecl the previous declaration found by name 3593/// lookup 3594/// 3595/// \param DC the context in which the new declaration is being 3596/// declared. 3597/// 3598/// \returns true if PrevDecl is an out-of-scope previous declaration 3599/// for a new delcaration with the same name. 3600static bool 3601isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3602 ASTContext &Context) { 3603 if (!PrevDecl) 3604 return false; 3605 3606 if (!PrevDecl->hasLinkage()) 3607 return false; 3608 3609 if (Context.getLangOptions().CPlusPlus) { 3610 // C++ [basic.link]p6: 3611 // If there is a visible declaration of an entity with linkage 3612 // having the same name and type, ignoring entities declared 3613 // outside the innermost enclosing namespace scope, the block 3614 // scope declaration declares that same entity and receives the 3615 // linkage of the previous declaration. 3616 DeclContext *OuterContext = DC->getRedeclContext(); 3617 if (!OuterContext->isFunctionOrMethod()) 3618 // This rule only applies to block-scope declarations. 3619 return false; 3620 3621 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3622 if (PrevOuterContext->isRecord()) 3623 // We found a member function: ignore it. 3624 return false; 3625 3626 // Find the innermost enclosing namespace for the new and 3627 // previous declarations. 3628 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3629 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3630 3631 // The previous declaration is in a different namespace, so it 3632 // isn't the same function. 3633 if (!OuterContext->Equals(PrevOuterContext)) 3634 return false; 3635 } 3636 3637 return true; 3638} 3639 3640static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3641 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3642 if (!SS.isSet()) return; 3643 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3644} 3645 3646bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3647 QualType type = decl->getType(); 3648 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3649 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3650 // Various kinds of declaration aren't allowed to be __autoreleasing. 3651 unsigned kind = -1U; 3652 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3653 if (var->hasAttr<BlocksAttr>()) 3654 kind = 0; // __block 3655 else if (!var->hasLocalStorage()) 3656 kind = 1; // global 3657 } else if (isa<ObjCIvarDecl>(decl)) { 3658 kind = 3; // ivar 3659 } else if (isa<FieldDecl>(decl)) { 3660 kind = 2; // field 3661 } 3662 3663 if (kind != -1U) { 3664 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3665 << kind; 3666 } 3667 } else if (lifetime == Qualifiers::OCL_None) { 3668 // Try to infer lifetime. 3669 if (!type->isObjCLifetimeType()) 3670 return false; 3671 3672 lifetime = type->getObjCARCImplicitLifetime(); 3673 type = Context.getLifetimeQualifiedType(type, lifetime); 3674 decl->setType(type); 3675 } 3676 3677 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3678 // Thread-local variables cannot have lifetime. 3679 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3680 var->isThreadSpecified()) { 3681 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3682 << var->getType(); 3683 return true; 3684 } 3685 } 3686 3687 return false; 3688} 3689 3690NamedDecl* 3691Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3692 QualType R, TypeSourceInfo *TInfo, 3693 LookupResult &Previous, 3694 MultiTemplateParamsArg TemplateParamLists, 3695 bool &Redeclaration) { 3696 DeclarationName Name = GetNameForDeclarator(D).getName(); 3697 3698 // Check that there are no default arguments (C++ only). 3699 if (getLangOptions().CPlusPlus) 3700 CheckExtraCXXDefaultArguments(D); 3701 3702 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3703 assert(SCSpec != DeclSpec::SCS_typedef && 3704 "Parser allowed 'typedef' as storage class VarDecl."); 3705 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3706 if (SCSpec == DeclSpec::SCS_mutable) { 3707 // mutable can only appear on non-static class members, so it's always 3708 // an error here 3709 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3710 D.setInvalidType(); 3711 SC = SC_None; 3712 } 3713 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3714 VarDecl::StorageClass SCAsWritten 3715 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3716 3717 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3718 if (!II) { 3719 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3720 << Name.getAsString(); 3721 return 0; 3722 } 3723 3724 DiagnoseFunctionSpecifiers(D); 3725 3726 if (!DC->isRecord() && S->getFnParent() == 0) { 3727 // C99 6.9p2: The storage-class specifiers auto and register shall not 3728 // appear in the declaration specifiers in an external declaration. 3729 if (SC == SC_Auto || SC == SC_Register) { 3730 3731 // If this is a register variable with an asm label specified, then this 3732 // is a GNU extension. 3733 if (SC == SC_Register && D.getAsmLabel()) 3734 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3735 else 3736 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3737 D.setInvalidType(); 3738 } 3739 } 3740 3741 if (getLangOptions().OpenCL) { 3742 // Set up the special work-group-local storage class for variables in the 3743 // OpenCL __local address space. 3744 if (R.getAddressSpace() == LangAS::opencl_local) 3745 SC = SC_OpenCLWorkGroupLocal; 3746 } 3747 3748 bool isExplicitSpecialization = false; 3749 VarDecl *NewVD; 3750 if (!getLangOptions().CPlusPlus) { 3751 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3752 D.getIdentifierLoc(), II, 3753 R, TInfo, SC, SCAsWritten); 3754 3755 if (D.isInvalidType()) 3756 NewVD->setInvalidDecl(); 3757 } else { 3758 if (DC->isRecord() && !CurContext->isRecord()) { 3759 // This is an out-of-line definition of a static data member. 3760 if (SC == SC_Static) { 3761 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3762 diag::err_static_out_of_line) 3763 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3764 } else if (SC == SC_None) 3765 SC = SC_Static; 3766 } 3767 if (SC == SC_Static) { 3768 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3769 if (RD->isLocalClass()) 3770 Diag(D.getIdentifierLoc(), 3771 diag::err_static_data_member_not_allowed_in_local_class) 3772 << Name << RD->getDeclName(); 3773 3774 // C++ [class.union]p1: If a union contains a static data member, 3775 // the program is ill-formed. 3776 // 3777 // We also disallow static data members in anonymous structs. 3778 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3779 Diag(D.getIdentifierLoc(), 3780 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3781 << Name << RD->isUnion(); 3782 } 3783 } 3784 3785 // Match up the template parameter lists with the scope specifier, then 3786 // determine whether we have a template or a template specialization. 3787 isExplicitSpecialization = false; 3788 bool Invalid = false; 3789 if (TemplateParameterList *TemplateParams 3790 = MatchTemplateParametersToScopeSpecifier( 3791 D.getDeclSpec().getSourceRange().getBegin(), 3792 D.getIdentifierLoc(), 3793 D.getCXXScopeSpec(), 3794 TemplateParamLists.get(), 3795 TemplateParamLists.size(), 3796 /*never a friend*/ false, 3797 isExplicitSpecialization, 3798 Invalid)) { 3799 if (TemplateParams->size() > 0) { 3800 // There is no such thing as a variable template. 3801 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3802 << II 3803 << SourceRange(TemplateParams->getTemplateLoc(), 3804 TemplateParams->getRAngleLoc()); 3805 return 0; 3806 } else { 3807 // There is an extraneous 'template<>' for this variable. Complain 3808 // about it, but allow the declaration of the variable. 3809 Diag(TemplateParams->getTemplateLoc(), 3810 diag::err_template_variable_noparams) 3811 << II 3812 << SourceRange(TemplateParams->getTemplateLoc(), 3813 TemplateParams->getRAngleLoc()); 3814 } 3815 } 3816 3817 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3818 D.getIdentifierLoc(), II, 3819 R, TInfo, SC, SCAsWritten); 3820 3821 // If this decl has an auto type in need of deduction, make a note of the 3822 // Decl so we can diagnose uses of it in its own initializer. 3823 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3824 R->getContainedAutoType()) 3825 ParsingInitForAutoVars.insert(NewVD); 3826 3827 if (D.isInvalidType() || Invalid) 3828 NewVD->setInvalidDecl(); 3829 3830 SetNestedNameSpecifier(NewVD, D); 3831 3832 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3833 NewVD->setTemplateParameterListsInfo(Context, 3834 TemplateParamLists.size(), 3835 TemplateParamLists.release()); 3836 } 3837 3838 if (D.getDeclSpec().isConstexprSpecified()) { 3839 // FIXME: once we know whether there's an initializer, apply this to 3840 // static data members too. 3841 if (!NewVD->isStaticDataMember() && 3842 !NewVD->isThisDeclarationADefinition()) { 3843 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3844 // of a variable. Suggest replacing it with 'const' if appropriate. 3845 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3846 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3847 // If the declarator is complex, we need to move the keyword to the 3848 // innermost chunk as we switch it from 'constexpr' to 'const'. 3849 int Kind = DeclaratorChunk::Paren; 3850 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3851 Kind = D.getTypeObject(I).Kind; 3852 if (Kind != DeclaratorChunk::Paren) 3853 break; 3854 } 3855 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3856 Kind == DeclaratorChunk::Reference) 3857 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3858 << FixItHint::CreateRemoval(ConstexprRange); 3859 else if (Kind == DeclaratorChunk::Paren) 3860 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3861 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3862 else 3863 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3864 << FixItHint::CreateRemoval(ConstexprRange) 3865 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3866 } else { 3867 NewVD->setConstexpr(true); 3868 } 3869 } 3870 } 3871 3872 // Set the lexical context. If the declarator has a C++ scope specifier, the 3873 // lexical context will be different from the semantic context. 3874 NewVD->setLexicalDeclContext(CurContext); 3875 3876 if (D.getDeclSpec().isThreadSpecified()) { 3877 if (NewVD->hasLocalStorage()) 3878 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3879 else if (!Context.getTargetInfo().isTLSSupported()) 3880 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3881 else 3882 NewVD->setThreadSpecified(true); 3883 } 3884 3885 if (D.getDeclSpec().isModulePrivateSpecified()) { 3886 if (isExplicitSpecialization) 3887 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3888 << 2 3889 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3890 else if (NewVD->hasLocalStorage()) 3891 Diag(NewVD->getLocation(), diag::err_module_private_local) 3892 << 0 << NewVD->getDeclName() 3893 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3894 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3895 else 3896 NewVD->setModulePrivate(); 3897 } 3898 3899 // Handle attributes prior to checking for duplicates in MergeVarDecl 3900 ProcessDeclAttributes(S, NewVD, D); 3901 3902 // In auto-retain/release, infer strong retension for variables of 3903 // retainable type. 3904 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3905 NewVD->setInvalidDecl(); 3906 3907 // Handle GNU asm-label extension (encoded as an attribute). 3908 if (Expr *E = (Expr*)D.getAsmLabel()) { 3909 // The parser guarantees this is a string. 3910 StringLiteral *SE = cast<StringLiteral>(E); 3911 StringRef Label = SE->getString(); 3912 if (S->getFnParent() != 0) { 3913 switch (SC) { 3914 case SC_None: 3915 case SC_Auto: 3916 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3917 break; 3918 case SC_Register: 3919 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3920 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3921 break; 3922 case SC_Static: 3923 case SC_Extern: 3924 case SC_PrivateExtern: 3925 case SC_OpenCLWorkGroupLocal: 3926 break; 3927 } 3928 } 3929 3930 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3931 Context, Label)); 3932 } 3933 3934 // Diagnose shadowed variables before filtering for scope. 3935 if (!D.getCXXScopeSpec().isSet()) 3936 CheckShadow(S, NewVD, Previous); 3937 3938 // Don't consider existing declarations that are in a different 3939 // scope and are out-of-semantic-context declarations (if the new 3940 // declaration has linkage). 3941 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3942 isExplicitSpecialization); 3943 3944 if (!getLangOptions().CPlusPlus) 3945 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3946 else { 3947 // Merge the decl with the existing one if appropriate. 3948 if (!Previous.empty()) { 3949 if (Previous.isSingleResult() && 3950 isa<FieldDecl>(Previous.getFoundDecl()) && 3951 D.getCXXScopeSpec().isSet()) { 3952 // The user tried to define a non-static data member 3953 // out-of-line (C++ [dcl.meaning]p1). 3954 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3955 << D.getCXXScopeSpec().getRange(); 3956 Previous.clear(); 3957 NewVD->setInvalidDecl(); 3958 } 3959 } else if (D.getCXXScopeSpec().isSet()) { 3960 // No previous declaration in the qualifying scope. 3961 Diag(D.getIdentifierLoc(), diag::err_no_member) 3962 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3963 << D.getCXXScopeSpec().getRange(); 3964 NewVD->setInvalidDecl(); 3965 } 3966 3967 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3968 3969 // This is an explicit specialization of a static data member. Check it. 3970 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3971 CheckMemberSpecialization(NewVD, Previous)) 3972 NewVD->setInvalidDecl(); 3973 } 3974 3975 // attributes declared post-definition are currently ignored 3976 // FIXME: This should be handled in attribute merging, not 3977 // here. 3978 if (Previous.isSingleResult()) { 3979 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3980 if (Def && (Def = Def->getDefinition()) && 3981 Def != NewVD && D.hasAttributes()) { 3982 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3983 Diag(Def->getLocation(), diag::note_previous_definition); 3984 } 3985 } 3986 3987 // If this is a locally-scoped extern C variable, update the map of 3988 // such variables. 3989 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3990 !NewVD->isInvalidDecl()) 3991 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3992 3993 // If there's a #pragma GCC visibility in scope, and this isn't a class 3994 // member, set the visibility of this variable. 3995 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3996 AddPushedVisibilityAttribute(NewVD); 3997 3998 MarkUnusedFileScopedDecl(NewVD); 3999 4000 return NewVD; 4001} 4002 4003/// \brief Diagnose variable or built-in function shadowing. Implements 4004/// -Wshadow. 4005/// 4006/// This method is called whenever a VarDecl is added to a "useful" 4007/// scope. 4008/// 4009/// \param S the scope in which the shadowing name is being declared 4010/// \param R the lookup of the name 4011/// 4012void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4013 // Return if warning is ignored. 4014 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4015 DiagnosticsEngine::Ignored) 4016 return; 4017 4018 // Don't diagnose declarations at file scope. 4019 if (D->hasGlobalStorage()) 4020 return; 4021 4022 DeclContext *NewDC = D->getDeclContext(); 4023 4024 // Only diagnose if we're shadowing an unambiguous field or variable. 4025 if (R.getResultKind() != LookupResult::Found) 4026 return; 4027 4028 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4029 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4030 return; 4031 4032 // Fields are not shadowed by variables in C++ static methods. 4033 if (isa<FieldDecl>(ShadowedDecl)) 4034 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4035 if (MD->isStatic()) 4036 return; 4037 4038 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4039 if (shadowedVar->isExternC()) { 4040 // For shadowing external vars, make sure that we point to the global 4041 // declaration, not a locally scoped extern declaration. 4042 for (VarDecl::redecl_iterator 4043 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4044 I != E; ++I) 4045 if (I->isFileVarDecl()) { 4046 ShadowedDecl = *I; 4047 break; 4048 } 4049 } 4050 4051 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4052 4053 // Only warn about certain kinds of shadowing for class members. 4054 if (NewDC && NewDC->isRecord()) { 4055 // In particular, don't warn about shadowing non-class members. 4056 if (!OldDC->isRecord()) 4057 return; 4058 4059 // TODO: should we warn about static data members shadowing 4060 // static data members from base classes? 4061 4062 // TODO: don't diagnose for inaccessible shadowed members. 4063 // This is hard to do perfectly because we might friend the 4064 // shadowing context, but that's just a false negative. 4065 } 4066 4067 // Determine what kind of declaration we're shadowing. 4068 unsigned Kind; 4069 if (isa<RecordDecl>(OldDC)) { 4070 if (isa<FieldDecl>(ShadowedDecl)) 4071 Kind = 3; // field 4072 else 4073 Kind = 2; // static data member 4074 } else if (OldDC->isFileContext()) 4075 Kind = 1; // global 4076 else 4077 Kind = 0; // local 4078 4079 DeclarationName Name = R.getLookupName(); 4080 4081 // Emit warning and note. 4082 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4083 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4084} 4085 4086/// \brief Check -Wshadow without the advantage of a previous lookup. 4087void Sema::CheckShadow(Scope *S, VarDecl *D) { 4088 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4089 DiagnosticsEngine::Ignored) 4090 return; 4091 4092 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4093 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4094 LookupName(R, S); 4095 CheckShadow(S, D, R); 4096} 4097 4098/// \brief Perform semantic checking on a newly-created variable 4099/// declaration. 4100/// 4101/// This routine performs all of the type-checking required for a 4102/// variable declaration once it has been built. It is used both to 4103/// check variables after they have been parsed and their declarators 4104/// have been translated into a declaration, and to check variables 4105/// that have been instantiated from a template. 4106/// 4107/// Sets NewVD->isInvalidDecl() if an error was encountered. 4108void Sema::CheckVariableDeclaration(VarDecl *NewVD, 4109 LookupResult &Previous, 4110 bool &Redeclaration) { 4111 // If the decl is already known invalid, don't check it. 4112 if (NewVD->isInvalidDecl()) 4113 return; 4114 4115 QualType T = NewVD->getType(); 4116 4117 if (T->isObjCObjectType()) { 4118 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4119 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4120 T = Context.getObjCObjectPointerType(T); 4121 NewVD->setType(T); 4122 } 4123 4124 // Emit an error if an address space was applied to decl with local storage. 4125 // This includes arrays of objects with address space qualifiers, but not 4126 // automatic variables that point to other address spaces. 4127 // ISO/IEC TR 18037 S5.1.2 4128 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4129 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4130 return NewVD->setInvalidDecl(); 4131 } 4132 4133 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4134 && !NewVD->hasAttr<BlocksAttr>()) { 4135 if (getLangOptions().getGC() != LangOptions::NonGC) 4136 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4137 else 4138 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4139 } 4140 4141 bool isVM = T->isVariablyModifiedType(); 4142 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4143 NewVD->hasAttr<BlocksAttr>()) 4144 getCurFunction()->setHasBranchProtectedScope(); 4145 4146 if ((isVM && NewVD->hasLinkage()) || 4147 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4148 bool SizeIsNegative; 4149 llvm::APSInt Oversized; 4150 QualType FixedTy = 4151 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4152 Oversized); 4153 4154 if (FixedTy.isNull() && T->isVariableArrayType()) { 4155 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4156 // FIXME: This won't give the correct result for 4157 // int a[10][n]; 4158 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4159 4160 if (NewVD->isFileVarDecl()) 4161 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4162 << SizeRange; 4163 else if (NewVD->getStorageClass() == SC_Static) 4164 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4165 << SizeRange; 4166 else 4167 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4168 << SizeRange; 4169 return NewVD->setInvalidDecl(); 4170 } 4171 4172 if (FixedTy.isNull()) { 4173 if (NewVD->isFileVarDecl()) 4174 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4175 else 4176 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4177 return NewVD->setInvalidDecl(); 4178 } 4179 4180 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4181 NewVD->setType(FixedTy); 4182 } 4183 4184 if (Previous.empty() && NewVD->isExternC()) { 4185 // Since we did not find anything by this name and we're declaring 4186 // an extern "C" variable, look for a non-visible extern "C" 4187 // declaration with the same name. 4188 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4189 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4190 if (Pos != LocallyScopedExternalDecls.end()) 4191 Previous.addDecl(Pos->second); 4192 } 4193 4194 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4195 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4196 << T; 4197 return NewVD->setInvalidDecl(); 4198 } 4199 4200 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4201 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4202 return NewVD->setInvalidDecl(); 4203 } 4204 4205 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4206 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4207 return NewVD->setInvalidDecl(); 4208 } 4209 4210 // Function pointers and references cannot have qualified function type, only 4211 // function pointer-to-members can do that. 4212 QualType Pointee; 4213 unsigned PtrOrRef = 0; 4214 if (const PointerType *Ptr = T->getAs<PointerType>()) 4215 Pointee = Ptr->getPointeeType(); 4216 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4217 Pointee = Ref->getPointeeType(); 4218 PtrOrRef = 1; 4219 } 4220 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4221 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4222 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4223 << PtrOrRef; 4224 return NewVD->setInvalidDecl(); 4225 } 4226 4227 if (!Previous.empty()) { 4228 Redeclaration = true; 4229 MergeVarDecl(NewVD, Previous); 4230 } 4231} 4232 4233/// \brief Data used with FindOverriddenMethod 4234struct FindOverriddenMethodData { 4235 Sema *S; 4236 CXXMethodDecl *Method; 4237}; 4238 4239/// \brief Member lookup function that determines whether a given C++ 4240/// method overrides a method in a base class, to be used with 4241/// CXXRecordDecl::lookupInBases(). 4242static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4243 CXXBasePath &Path, 4244 void *UserData) { 4245 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4246 4247 FindOverriddenMethodData *Data 4248 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4249 4250 DeclarationName Name = Data->Method->getDeclName(); 4251 4252 // FIXME: Do we care about other names here too? 4253 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4254 // We really want to find the base class destructor here. 4255 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4256 CanQualType CT = Data->S->Context.getCanonicalType(T); 4257 4258 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4259 } 4260 4261 for (Path.Decls = BaseRecord->lookup(Name); 4262 Path.Decls.first != Path.Decls.second; 4263 ++Path.Decls.first) { 4264 NamedDecl *D = *Path.Decls.first; 4265 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4266 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4267 return true; 4268 } 4269 } 4270 4271 return false; 4272} 4273 4274/// AddOverriddenMethods - See if a method overrides any in the base classes, 4275/// and if so, check that it's a valid override and remember it. 4276bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4277 // Look for virtual methods in base classes that this method might override. 4278 CXXBasePaths Paths; 4279 FindOverriddenMethodData Data; 4280 Data.Method = MD; 4281 Data.S = this; 4282 bool AddedAny = false; 4283 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4284 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4285 E = Paths.found_decls_end(); I != E; ++I) { 4286 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4287 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4288 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4289 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4290 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4291 AddedAny = true; 4292 } 4293 } 4294 } 4295 } 4296 4297 return AddedAny; 4298} 4299 4300static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD, 4301 bool isFriendDecl) { 4302 DeclarationName Name = NewFD->getDeclName(); 4303 DeclContext *DC = NewFD->getDeclContext(); 4304 LookupResult Prev(S, Name, NewFD->getLocation(), 4305 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4306 llvm::SmallVector<unsigned, 1> MismatchedParams; 4307 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4308 TypoCorrection Correction; 4309 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4310 : diag::err_member_def_does_not_match; 4311 4312 NewFD->setInvalidDecl(); 4313 S.LookupQualifiedName(Prev, DC); 4314 assert(!Prev.isAmbiguous() && 4315 "Cannot have an ambiguity in previous-declaration lookup"); 4316 if (!Prev.empty()) { 4317 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4318 Func != FuncEnd; ++Func) { 4319 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4320 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4321 MismatchedParams)) { 4322 // Add 1 to the index so that 0 can mean the mismatch didn't 4323 // involve a parameter 4324 unsigned ParamNum = 4325 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4326 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4327 } 4328 } 4329 // If the qualified name lookup yielded nothing, try typo correction 4330 } else if ((Correction = S.CorrectTypo(Prev.getLookupNameInfo(), 4331 Prev.getLookupKind(), 0, 0, DC)) && 4332 Correction.getCorrection() != Name) { 4333 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4334 CDeclEnd = Correction.end(); 4335 CDecl != CDeclEnd; ++CDecl) { 4336 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4337 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4338 MismatchedParams)) { 4339 // Add 1 to the index so that 0 can mean the mismatch didn't 4340 // involve a parameter 4341 unsigned ParamNum = 4342 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4343 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4344 } 4345 } 4346 if (!NearMatches.empty()) 4347 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4348 : diag::err_member_def_does_not_match_suggest; 4349 } 4350 4351 // Ignore the correction if it didn't yield any close FunctionDecl matches 4352 if (Correction && NearMatches.empty()) 4353 Correction = TypoCorrection(); 4354 4355 if (Correction) 4356 S.Diag(NewFD->getLocation(), DiagMsg) 4357 << Name << DC << Correction.getQuoted(S.getLangOptions()) 4358 << FixItHint::CreateReplacement( 4359 NewFD->getLocation(), Correction.getAsString(S.getLangOptions())); 4360 else 4361 S.Diag(NewFD->getLocation(), DiagMsg) << Name << DC << NewFD->getLocation(); 4362 4363 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4364 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4365 NearMatch != NearMatchEnd; ++NearMatch) { 4366 FunctionDecl *FD = NearMatch->first; 4367 4368 if (unsigned Idx = NearMatch->second) { 4369 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4370 S.Diag(FDParam->getTypeSpecStartLoc(), 4371 diag::note_member_def_close_param_match) 4372 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4373 } else if (Correction) { 4374 S.Diag(FD->getLocation(), diag::note_previous_decl) 4375 << Correction.getQuoted(S.getLangOptions()); 4376 } else 4377 S.Diag(FD->getLocation(), diag::note_member_def_close_match); 4378 } 4379} 4380 4381NamedDecl* 4382Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4383 QualType R, TypeSourceInfo *TInfo, 4384 LookupResult &Previous, 4385 MultiTemplateParamsArg TemplateParamLists, 4386 bool IsFunctionDefinition, bool &Redeclaration, 4387 bool &AddToScope) { 4388 assert(R.getTypePtr()->isFunctionType()); 4389 4390 // TODO: consider using NameInfo for diagnostic. 4391 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4392 DeclarationName Name = NameInfo.getName(); 4393 FunctionDecl::StorageClass SC = SC_None; 4394 switch (D.getDeclSpec().getStorageClassSpec()) { 4395 default: llvm_unreachable("Unknown storage class!"); 4396 case DeclSpec::SCS_auto: 4397 case DeclSpec::SCS_register: 4398 case DeclSpec::SCS_mutable: 4399 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4400 diag::err_typecheck_sclass_func); 4401 D.setInvalidType(); 4402 break; 4403 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4404 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4405 case DeclSpec::SCS_static: { 4406 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4407 // C99 6.7.1p5: 4408 // The declaration of an identifier for a function that has 4409 // block scope shall have no explicit storage-class specifier 4410 // other than extern 4411 // See also (C++ [dcl.stc]p4). 4412 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4413 diag::err_static_block_func); 4414 SC = SC_None; 4415 } else 4416 SC = SC_Static; 4417 break; 4418 } 4419 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4420 } 4421 4422 if (D.getDeclSpec().isThreadSpecified()) 4423 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4424 4425 // Do not allow returning a objc interface by-value. 4426 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4427 Diag(D.getIdentifierLoc(), 4428 diag::err_object_cannot_be_passed_returned_by_value) << 0 4429 << R->getAs<FunctionType>()->getResultType() 4430 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4431 4432 QualType T = R->getAs<FunctionType>()->getResultType(); 4433 T = Context.getObjCObjectPointerType(T); 4434 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4435 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4436 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4437 FPT->getNumArgs(), EPI); 4438 } 4439 else if (isa<FunctionNoProtoType>(R)) 4440 R = Context.getFunctionNoProtoType(T); 4441 } 4442 4443 FunctionDecl *NewFD; 4444 bool isInline = D.getDeclSpec().isInlineSpecified(); 4445 bool isFriend = false; 4446 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4447 FunctionDecl::StorageClass SCAsWritten 4448 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4449 FunctionTemplateDecl *FunctionTemplate = 0; 4450 bool isExplicitSpecialization = false; 4451 bool isFunctionTemplateSpecialization = false; 4452 bool isDependentClassScopeExplicitSpecialization = false; 4453 4454 if (!getLangOptions().CPlusPlus) { 4455 // Determine whether the function was written with a 4456 // prototype. This true when: 4457 // - there is a prototype in the declarator, or 4458 // - the type R of the function is some kind of typedef or other reference 4459 // to a type name (which eventually refers to a function type). 4460 bool HasPrototype = 4461 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4462 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4463 4464 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4465 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4466 HasPrototype); 4467 if (D.isInvalidType()) 4468 NewFD->setInvalidDecl(); 4469 4470 // Set the lexical context. 4471 NewFD->setLexicalDeclContext(CurContext); 4472 // Filter out previous declarations that don't match the scope. 4473 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4474 /*ExplicitInstantiationOrSpecialization=*/false); 4475 } else { 4476 isFriend = D.getDeclSpec().isFriendSpecified(); 4477 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4478 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4479 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4480 bool isVirtualOkay = false; 4481 4482 // Check that the return type is not an abstract class type. 4483 // For record types, this is done by the AbstractClassUsageDiagnoser once 4484 // the class has been completely parsed. 4485 if (!DC->isRecord() && 4486 RequireNonAbstractType(D.getIdentifierLoc(), 4487 R->getAs<FunctionType>()->getResultType(), 4488 diag::err_abstract_type_in_decl, 4489 AbstractReturnType)) 4490 D.setInvalidType(); 4491 4492 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4493 // This is a C++ constructor declaration. 4494 assert(DC->isRecord() && 4495 "Constructors can only be declared in a member context"); 4496 4497 R = CheckConstructorDeclarator(D, R, SC); 4498 4499 // Create the new declaration 4500 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4501 Context, 4502 cast<CXXRecordDecl>(DC), 4503 D.getSourceRange().getBegin(), 4504 NameInfo, R, TInfo, 4505 isExplicit, isInline, 4506 /*isImplicitlyDeclared=*/false, 4507 isConstexpr); 4508 4509 NewFD = NewCD; 4510 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4511 // This is a C++ destructor declaration. 4512 if (DC->isRecord()) { 4513 R = CheckDestructorDeclarator(D, R, SC); 4514 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4515 4516 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4517 D.getSourceRange().getBegin(), 4518 NameInfo, R, TInfo, 4519 isInline, 4520 /*isImplicitlyDeclared=*/false); 4521 NewFD = NewDD; 4522 isVirtualOkay = true; 4523 4524 // If the class is complete, then we now create the implicit exception 4525 // specification. If the class is incomplete or dependent, we can't do 4526 // it yet. 4527 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4528 Record->getDefinition() && !Record->isBeingDefined() && 4529 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4530 AdjustDestructorExceptionSpec(Record, NewDD); 4531 } 4532 4533 } else { 4534 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4535 4536 // Create a FunctionDecl to satisfy the function definition parsing 4537 // code path. 4538 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4539 D.getIdentifierLoc(), Name, R, TInfo, 4540 SC, SCAsWritten, isInline, 4541 /*hasPrototype=*/true, isConstexpr); 4542 D.setInvalidType(); 4543 } 4544 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4545 if (!DC->isRecord()) { 4546 Diag(D.getIdentifierLoc(), 4547 diag::err_conv_function_not_member); 4548 return 0; 4549 } 4550 4551 CheckConversionDeclarator(D, R, SC); 4552 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4553 D.getSourceRange().getBegin(), 4554 NameInfo, R, TInfo, 4555 isInline, isExplicit, isConstexpr, 4556 SourceLocation()); 4557 4558 isVirtualOkay = true; 4559 } else if (DC->isRecord()) { 4560 // If the name of the function is the same as the name of the record, 4561 // then this must be an invalid constructor that has a return type. 4562 // (The parser checks for a return type and makes the declarator a 4563 // constructor if it has no return type). 4564 if (Name.getAsIdentifierInfo() && 4565 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4566 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4567 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4568 << SourceRange(D.getIdentifierLoc()); 4569 return 0; 4570 } 4571 4572 bool isStatic = SC == SC_Static; 4573 4574 // [class.free]p1: 4575 // Any allocation function for a class T is a static member 4576 // (even if not explicitly declared static). 4577 if (Name.getCXXOverloadedOperator() == OO_New || 4578 Name.getCXXOverloadedOperator() == OO_Array_New) 4579 isStatic = true; 4580 4581 // [class.free]p6 Any deallocation function for a class X is a static member 4582 // (even if not explicitly declared static). 4583 if (Name.getCXXOverloadedOperator() == OO_Delete || 4584 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4585 isStatic = true; 4586 4587 // This is a C++ method declaration. 4588 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4589 Context, cast<CXXRecordDecl>(DC), 4590 D.getSourceRange().getBegin(), 4591 NameInfo, R, TInfo, 4592 isStatic, SCAsWritten, isInline, 4593 isConstexpr, 4594 SourceLocation()); 4595 NewFD = NewMD; 4596 4597 isVirtualOkay = !isStatic; 4598 } else { 4599 // Determine whether the function was written with a 4600 // prototype. This true when: 4601 // - we're in C++ (where every function has a prototype), 4602 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4603 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4604 true/*HasPrototype*/, isConstexpr); 4605 } 4606 4607 if (isFriend && !isInline && IsFunctionDefinition) { 4608 // C++ [class.friend]p5 4609 // A function can be defined in a friend declaration of a 4610 // class . . . . Such a function is implicitly inline. 4611 NewFD->setImplicitlyInline(); 4612 } 4613 4614 SetNestedNameSpecifier(NewFD, D); 4615 isExplicitSpecialization = false; 4616 isFunctionTemplateSpecialization = false; 4617 if (D.isInvalidType()) 4618 NewFD->setInvalidDecl(); 4619 4620 // Set the lexical context. If the declarator has a C++ 4621 // scope specifier, or is the object of a friend declaration, the 4622 // lexical context will be different from the semantic context. 4623 NewFD->setLexicalDeclContext(CurContext); 4624 4625 // Match up the template parameter lists with the scope specifier, then 4626 // determine whether we have a template or a template specialization. 4627 bool Invalid = false; 4628 if (TemplateParameterList *TemplateParams 4629 = MatchTemplateParametersToScopeSpecifier( 4630 D.getDeclSpec().getSourceRange().getBegin(), 4631 D.getIdentifierLoc(), 4632 D.getCXXScopeSpec(), 4633 TemplateParamLists.get(), 4634 TemplateParamLists.size(), 4635 isFriend, 4636 isExplicitSpecialization, 4637 Invalid)) { 4638 if (TemplateParams->size() > 0) { 4639 // This is a function template 4640 4641 // Check that we can declare a template here. 4642 if (CheckTemplateDeclScope(S, TemplateParams)) 4643 return 0; 4644 4645 // A destructor cannot be a template. 4646 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4647 Diag(NewFD->getLocation(), diag::err_destructor_template); 4648 return 0; 4649 } 4650 4651 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4652 NewFD->getLocation(), 4653 Name, TemplateParams, 4654 NewFD); 4655 FunctionTemplate->setLexicalDeclContext(CurContext); 4656 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4657 4658 // For source fidelity, store the other template param lists. 4659 if (TemplateParamLists.size() > 1) { 4660 NewFD->setTemplateParameterListsInfo(Context, 4661 TemplateParamLists.size() - 1, 4662 TemplateParamLists.release()); 4663 } 4664 } else { 4665 // This is a function template specialization. 4666 isFunctionTemplateSpecialization = true; 4667 // For source fidelity, store all the template param lists. 4668 NewFD->setTemplateParameterListsInfo(Context, 4669 TemplateParamLists.size(), 4670 TemplateParamLists.release()); 4671 4672 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4673 if (isFriend) { 4674 // We want to remove the "template<>", found here. 4675 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4676 4677 // If we remove the template<> and the name is not a 4678 // template-id, we're actually silently creating a problem: 4679 // the friend declaration will refer to an untemplated decl, 4680 // and clearly the user wants a template specialization. So 4681 // we need to insert '<>' after the name. 4682 SourceLocation InsertLoc; 4683 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4684 InsertLoc = D.getName().getSourceRange().getEnd(); 4685 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4686 } 4687 4688 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4689 << Name << RemoveRange 4690 << FixItHint::CreateRemoval(RemoveRange) 4691 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4692 } 4693 } 4694 } 4695 else { 4696 // All template param lists were matched against the scope specifier: 4697 // this is NOT (an explicit specialization of) a template. 4698 if (TemplateParamLists.size() > 0) 4699 // For source fidelity, store all the template param lists. 4700 NewFD->setTemplateParameterListsInfo(Context, 4701 TemplateParamLists.size(), 4702 TemplateParamLists.release()); 4703 } 4704 4705 if (Invalid) { 4706 NewFD->setInvalidDecl(); 4707 if (FunctionTemplate) 4708 FunctionTemplate->setInvalidDecl(); 4709 } 4710 4711 // C++ [dcl.fct.spec]p5: 4712 // The virtual specifier shall only be used in declarations of 4713 // nonstatic class member functions that appear within a 4714 // member-specification of a class declaration; see 10.3. 4715 // 4716 if (isVirtual && !NewFD->isInvalidDecl()) { 4717 if (!isVirtualOkay) { 4718 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4719 diag::err_virtual_non_function); 4720 } else if (!CurContext->isRecord()) { 4721 // 'virtual' was specified outside of the class. 4722 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4723 diag::err_virtual_out_of_class) 4724 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4725 } else if (NewFD->getDescribedFunctionTemplate()) { 4726 // C++ [temp.mem]p3: 4727 // A member function template shall not be virtual. 4728 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4729 diag::err_virtual_member_function_template) 4730 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4731 } else { 4732 // Okay: Add virtual to the method. 4733 NewFD->setVirtualAsWritten(true); 4734 } 4735 } 4736 4737 // C++ [dcl.fct.spec]p3: 4738 // The inline specifier shall not appear on a block scope function declaration. 4739 if (isInline && !NewFD->isInvalidDecl()) { 4740 if (CurContext->isFunctionOrMethod()) { 4741 // 'inline' is not allowed on block scope function declaration. 4742 Diag(D.getDeclSpec().getInlineSpecLoc(), 4743 diag::err_inline_declaration_block_scope) << Name 4744 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4745 } 4746 } 4747 4748 // C++ [dcl.fct.spec]p6: 4749 // The explicit specifier shall be used only in the declaration of a 4750 // constructor or conversion function within its class definition; see 12.3.1 4751 // and 12.3.2. 4752 if (isExplicit && !NewFD->isInvalidDecl()) { 4753 if (!CurContext->isRecord()) { 4754 // 'explicit' was specified outside of the class. 4755 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4756 diag::err_explicit_out_of_class) 4757 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4758 } else if (!isa<CXXConstructorDecl>(NewFD) && 4759 !isa<CXXConversionDecl>(NewFD)) { 4760 // 'explicit' was specified on a function that wasn't a constructor 4761 // or conversion function. 4762 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4763 diag::err_explicit_non_ctor_or_conv_function) 4764 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4765 } 4766 } 4767 4768 if (isConstexpr) { 4769 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4770 // are implicitly inline. 4771 NewFD->setImplicitlyInline(); 4772 4773 // FIXME: If this is a redeclaration, check the original declaration was 4774 // marked constepr. 4775 4776 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4777 // be either constructors or to return a literal type. Therefore, 4778 // destructors cannot be declared constexpr. 4779 if (isa<CXXDestructorDecl>(NewFD)) 4780 Diag(D.getDeclSpec().getConstexprSpecLoc(), 4781 diag::err_constexpr_dtor); 4782 } 4783 4784 // If __module_private__ was specified, mark the function accordingly. 4785 if (D.getDeclSpec().isModulePrivateSpecified()) { 4786 if (isFunctionTemplateSpecialization) { 4787 SourceLocation ModulePrivateLoc 4788 = D.getDeclSpec().getModulePrivateSpecLoc(); 4789 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4790 << 0 4791 << FixItHint::CreateRemoval(ModulePrivateLoc); 4792 } else { 4793 NewFD->setModulePrivate(); 4794 if (FunctionTemplate) 4795 FunctionTemplate->setModulePrivate(); 4796 } 4797 } 4798 4799 // Filter out previous declarations that don't match the scope. 4800 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4801 isExplicitSpecialization || 4802 isFunctionTemplateSpecialization); 4803 4804 if (isFriend) { 4805 // For now, claim that the objects have no previous declaration. 4806 if (FunctionTemplate) { 4807 FunctionTemplate->setObjectOfFriendDecl(false); 4808 FunctionTemplate->setAccess(AS_public); 4809 } 4810 NewFD->setObjectOfFriendDecl(false); 4811 NewFD->setAccess(AS_public); 4812 } 4813 4814 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4815 // A method is implicitly inline if it's defined in its class 4816 // definition. 4817 NewFD->setImplicitlyInline(); 4818 } 4819 4820 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4821 !CurContext->isRecord()) { 4822 // C++ [class.static]p1: 4823 // A data or function member of a class may be declared static 4824 // in a class definition, in which case it is a static member of 4825 // the class. 4826 4827 // Complain about the 'static' specifier if it's on an out-of-line 4828 // member function definition. 4829 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4830 diag::err_static_out_of_line) 4831 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4832 } 4833 } 4834 4835 // Handle GNU asm-label extension (encoded as an attribute). 4836 if (Expr *E = (Expr*) D.getAsmLabel()) { 4837 // The parser guarantees this is a string. 4838 StringLiteral *SE = cast<StringLiteral>(E); 4839 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4840 SE->getString())); 4841 } 4842 4843 // Copy the parameter declarations from the declarator D to the function 4844 // declaration NewFD, if they are available. First scavenge them into Params. 4845 SmallVector<ParmVarDecl*, 16> Params; 4846 if (D.isFunctionDeclarator()) { 4847 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4848 4849 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4850 // function that takes no arguments, not a function that takes a 4851 // single void argument. 4852 // We let through "const void" here because Sema::GetTypeForDeclarator 4853 // already checks for that case. 4854 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4855 FTI.ArgInfo[0].Param && 4856 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4857 // Empty arg list, don't push any params. 4858 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4859 4860 // In C++, the empty parameter-type-list must be spelled "void"; a 4861 // typedef of void is not permitted. 4862 if (getLangOptions().CPlusPlus && 4863 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4864 bool IsTypeAlias = false; 4865 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4866 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4867 else if (const TemplateSpecializationType *TST = 4868 Param->getType()->getAs<TemplateSpecializationType>()) 4869 IsTypeAlias = TST->isTypeAlias(); 4870 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4871 << IsTypeAlias; 4872 } 4873 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4874 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4875 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4876 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4877 Param->setDeclContext(NewFD); 4878 Params.push_back(Param); 4879 4880 if (Param->isInvalidDecl()) 4881 NewFD->setInvalidDecl(); 4882 } 4883 } 4884 4885 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4886 // When we're declaring a function with a typedef, typeof, etc as in the 4887 // following example, we'll need to synthesize (unnamed) 4888 // parameters for use in the declaration. 4889 // 4890 // @code 4891 // typedef void fn(int); 4892 // fn f; 4893 // @endcode 4894 4895 // Synthesize a parameter for each argument type. 4896 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4897 AE = FT->arg_type_end(); AI != AE; ++AI) { 4898 ParmVarDecl *Param = 4899 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4900 Param->setScopeInfo(0, Params.size()); 4901 Params.push_back(Param); 4902 } 4903 } else { 4904 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4905 "Should not need args for typedef of non-prototype fn"); 4906 } 4907 // Finally, we know we have the right number of parameters, install them. 4908 NewFD->setParams(Params); 4909 4910 // Process the non-inheritable attributes on this declaration. 4911 ProcessDeclAttributes(S, NewFD, D, 4912 /*NonInheritable=*/true, /*Inheritable=*/false); 4913 4914 if (!getLangOptions().CPlusPlus) { 4915 // Perform semantic checking on the function declaration. 4916 bool isExplicitSpecialization=false; 4917 if (!NewFD->isInvalidDecl()) { 4918 if (NewFD->getResultType()->isVariablyModifiedType()) { 4919 // Functions returning a variably modified type violate C99 6.7.5.2p2 4920 // because all functions have linkage. 4921 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4922 NewFD->setInvalidDecl(); 4923 } else { 4924 if (NewFD->isMain()) 4925 CheckMain(NewFD, D.getDeclSpec()); 4926 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4927 Redeclaration); 4928 } 4929 } 4930 assert((NewFD->isInvalidDecl() || !Redeclaration || 4931 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4932 "previous declaration set still overloaded"); 4933 } else { 4934 // If the declarator is a template-id, translate the parser's template 4935 // argument list into our AST format. 4936 bool HasExplicitTemplateArgs = false; 4937 TemplateArgumentListInfo TemplateArgs; 4938 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4939 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4940 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4941 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4942 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4943 TemplateId->getTemplateArgs(), 4944 TemplateId->NumArgs); 4945 translateTemplateArguments(TemplateArgsPtr, 4946 TemplateArgs); 4947 TemplateArgsPtr.release(); 4948 4949 HasExplicitTemplateArgs = true; 4950 4951 if (NewFD->isInvalidDecl()) { 4952 HasExplicitTemplateArgs = false; 4953 } else if (FunctionTemplate) { 4954 // Function template with explicit template arguments. 4955 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4956 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4957 4958 HasExplicitTemplateArgs = false; 4959 } else if (!isFunctionTemplateSpecialization && 4960 !D.getDeclSpec().isFriendSpecified()) { 4961 // We have encountered something that the user meant to be a 4962 // specialization (because it has explicitly-specified template 4963 // arguments) but that was not introduced with a "template<>" (or had 4964 // too few of them). 4965 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4966 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4967 << FixItHint::CreateInsertion( 4968 D.getDeclSpec().getSourceRange().getBegin(), 4969 "template<> "); 4970 isFunctionTemplateSpecialization = true; 4971 } else { 4972 // "friend void foo<>(int);" is an implicit specialization decl. 4973 isFunctionTemplateSpecialization = true; 4974 } 4975 } else if (isFriend && isFunctionTemplateSpecialization) { 4976 // This combination is only possible in a recovery case; the user 4977 // wrote something like: 4978 // template <> friend void foo(int); 4979 // which we're recovering from as if the user had written: 4980 // friend void foo<>(int); 4981 // Go ahead and fake up a template id. 4982 HasExplicitTemplateArgs = true; 4983 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4984 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4985 } 4986 4987 // If it's a friend (and only if it's a friend), it's possible 4988 // that either the specialized function type or the specialized 4989 // template is dependent, and therefore matching will fail. In 4990 // this case, don't check the specialization yet. 4991 if (isFunctionTemplateSpecialization && isFriend && 4992 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4993 assert(HasExplicitTemplateArgs && 4994 "friend function specialization without template args"); 4995 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4996 Previous)) 4997 NewFD->setInvalidDecl(); 4998 } else if (isFunctionTemplateSpecialization) { 4999 if (CurContext->isDependentContext() && CurContext->isRecord() 5000 && !isFriend) { 5001 isDependentClassScopeExplicitSpecialization = true; 5002 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5003 diag::ext_function_specialization_in_class : 5004 diag::err_function_specialization_in_class) 5005 << NewFD->getDeclName(); 5006 } else if (CheckFunctionTemplateSpecialization(NewFD, 5007 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5008 Previous)) 5009 NewFD->setInvalidDecl(); 5010 5011 // C++ [dcl.stc]p1: 5012 // A storage-class-specifier shall not be specified in an explicit 5013 // specialization (14.7.3) 5014 if (SC != SC_None) { 5015 if (SC != NewFD->getStorageClass()) 5016 Diag(NewFD->getLocation(), 5017 diag::err_explicit_specialization_inconsistent_storage_class) 5018 << SC 5019 << FixItHint::CreateRemoval( 5020 D.getDeclSpec().getStorageClassSpecLoc()); 5021 5022 else 5023 Diag(NewFD->getLocation(), 5024 diag::ext_explicit_specialization_storage_class) 5025 << FixItHint::CreateRemoval( 5026 D.getDeclSpec().getStorageClassSpecLoc()); 5027 } 5028 5029 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5030 if (CheckMemberSpecialization(NewFD, Previous)) 5031 NewFD->setInvalidDecl(); 5032 } 5033 5034 // Perform semantic checking on the function declaration. 5035 if (!isDependentClassScopeExplicitSpecialization) { 5036 if (NewFD->isInvalidDecl()) { 5037 // If this is a class member, mark the class invalid immediately. 5038 // This avoids some consistency errors later. 5039 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5040 methodDecl->getParent()->setInvalidDecl(); 5041 } else { 5042 if (NewFD->isMain()) 5043 CheckMain(NewFD, D.getDeclSpec()); 5044 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 5045 Redeclaration); 5046 } 5047 } 5048 5049 assert((NewFD->isInvalidDecl() || !Redeclaration || 5050 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5051 "previous declaration set still overloaded"); 5052 5053 NamedDecl *PrincipalDecl = (FunctionTemplate 5054 ? cast<NamedDecl>(FunctionTemplate) 5055 : NewFD); 5056 5057 if (isFriend && Redeclaration) { 5058 AccessSpecifier Access = AS_public; 5059 if (!NewFD->isInvalidDecl()) 5060 Access = NewFD->getPreviousDeclaration()->getAccess(); 5061 5062 NewFD->setAccess(Access); 5063 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5064 5065 PrincipalDecl->setObjectOfFriendDecl(true); 5066 } 5067 5068 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5069 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5070 PrincipalDecl->setNonMemberOperator(); 5071 5072 // If we have a function template, check the template parameter 5073 // list. This will check and merge default template arguments. 5074 if (FunctionTemplate) { 5075 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 5076 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5077 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 5078 D.getDeclSpec().isFriendSpecified() 5079 ? (IsFunctionDefinition 5080 ? TPC_FriendFunctionTemplateDefinition 5081 : TPC_FriendFunctionTemplate) 5082 : (D.getCXXScopeSpec().isSet() && 5083 DC && DC->isRecord() && 5084 DC->isDependentContext()) 5085 ? TPC_ClassTemplateMember 5086 : TPC_FunctionTemplate); 5087 } 5088 5089 if (NewFD->isInvalidDecl()) { 5090 // Ignore all the rest of this. 5091 } else if (!Redeclaration) { 5092 // Fake up an access specifier if it's supposed to be a class member. 5093 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5094 NewFD->setAccess(AS_public); 5095 5096 // Qualified decls generally require a previous declaration. 5097 if (D.getCXXScopeSpec().isSet()) { 5098 // ...with the major exception of templated-scope or 5099 // dependent-scope friend declarations. 5100 5101 // TODO: we currently also suppress this check in dependent 5102 // contexts because (1) the parameter depth will be off when 5103 // matching friend templates and (2) we might actually be 5104 // selecting a friend based on a dependent factor. But there 5105 // are situations where these conditions don't apply and we 5106 // can actually do this check immediately. 5107 if (isFriend && 5108 (TemplateParamLists.size() || 5109 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5110 CurContext->isDependentContext())) { 5111 // ignore these 5112 } else { 5113 // The user tried to provide an out-of-line definition for a 5114 // function that is a member of a class or namespace, but there 5115 // was no such member function declared (C++ [class.mfct]p2, 5116 // C++ [namespace.memdef]p2). For example: 5117 // 5118 // class X { 5119 // void f() const; 5120 // }; 5121 // 5122 // void X::f() { } // ill-formed 5123 // 5124 // Complain about this problem, and attempt to suggest close 5125 // matches (e.g., those that differ only in cv-qualifiers and 5126 // whether the parameter types are references). 5127 5128 DiagnoseInvalidRedeclaration(*this, NewFD, false); 5129 } 5130 5131 // Unqualified local friend declarations are required to resolve 5132 // to something. 5133 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5134 DiagnoseInvalidRedeclaration(*this, NewFD, true); 5135 } 5136 5137 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 5138 !isFriend && !isFunctionTemplateSpecialization && 5139 !isExplicitSpecialization) { 5140 // An out-of-line member function declaration must also be a 5141 // definition (C++ [dcl.meaning]p1). 5142 // Note that this is not the case for explicit specializations of 5143 // function templates or member functions of class templates, per 5144 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5145 // for compatibility with old SWIG code which likes to generate them. 5146 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5147 << D.getCXXScopeSpec().getRange(); 5148 } 5149 } 5150 5151 5152 // Handle attributes. We need to have merged decls when handling attributes 5153 // (for example to check for conflicts, etc). 5154 // FIXME: This needs to happen before we merge declarations. Then, 5155 // let attribute merging cope with attribute conflicts. 5156 ProcessDeclAttributes(S, NewFD, D, 5157 /*NonInheritable=*/false, /*Inheritable=*/true); 5158 5159 // attributes declared post-definition are currently ignored 5160 // FIXME: This should happen during attribute merging 5161 if (Redeclaration && Previous.isSingleResult()) { 5162 const FunctionDecl *Def; 5163 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5164 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5165 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5166 Diag(Def->getLocation(), diag::note_previous_definition); 5167 } 5168 } 5169 5170 AddKnownFunctionAttributes(NewFD); 5171 5172 if (NewFD->hasAttr<OverloadableAttr>() && 5173 !NewFD->getType()->getAs<FunctionProtoType>()) { 5174 Diag(NewFD->getLocation(), 5175 diag::err_attribute_overloadable_no_prototype) 5176 << NewFD; 5177 5178 // Turn this into a variadic function with no parameters. 5179 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5180 FunctionProtoType::ExtProtoInfo EPI; 5181 EPI.Variadic = true; 5182 EPI.ExtInfo = FT->getExtInfo(); 5183 5184 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5185 NewFD->setType(R); 5186 } 5187 5188 // If there's a #pragma GCC visibility in scope, and this isn't a class 5189 // member, set the visibility of this function. 5190 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5191 AddPushedVisibilityAttribute(NewFD); 5192 5193 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5194 // marking the function. 5195 AddCFAuditedAttribute(NewFD); 5196 5197 // If this is a locally-scoped extern C function, update the 5198 // map of such names. 5199 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5200 && !NewFD->isInvalidDecl()) 5201 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5202 5203 // Set this FunctionDecl's range up to the right paren. 5204 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5205 5206 if (getLangOptions().CPlusPlus) { 5207 if (FunctionTemplate) { 5208 if (NewFD->isInvalidDecl()) 5209 FunctionTemplate->setInvalidDecl(); 5210 return FunctionTemplate; 5211 } 5212 } 5213 5214 MarkUnusedFileScopedDecl(NewFD); 5215 5216 if (getLangOptions().CUDA) 5217 if (IdentifierInfo *II = NewFD->getIdentifier()) 5218 if (!NewFD->isInvalidDecl() && 5219 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5220 if (II->isStr("cudaConfigureCall")) { 5221 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5222 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5223 5224 Context.setcudaConfigureCallDecl(NewFD); 5225 } 5226 } 5227 5228 // Here we have an function template explicit specialization at class scope. 5229 // The actually specialization will be postponed to template instatiation 5230 // time via the ClassScopeFunctionSpecializationDecl node. 5231 if (isDependentClassScopeExplicitSpecialization) { 5232 ClassScopeFunctionSpecializationDecl *NewSpec = 5233 ClassScopeFunctionSpecializationDecl::Create( 5234 Context, CurContext, SourceLocation(), 5235 cast<CXXMethodDecl>(NewFD)); 5236 CurContext->addDecl(NewSpec); 5237 AddToScope = false; 5238 } 5239 5240 return NewFD; 5241} 5242 5243/// \brief Perform semantic checking of a new function declaration. 5244/// 5245/// Performs semantic analysis of the new function declaration 5246/// NewFD. This routine performs all semantic checking that does not 5247/// require the actual declarator involved in the declaration, and is 5248/// used both for the declaration of functions as they are parsed 5249/// (called via ActOnDeclarator) and for the declaration of functions 5250/// that have been instantiated via C++ template instantiation (called 5251/// via InstantiateDecl). 5252/// 5253/// \param IsExplicitSpecialiation whether this new function declaration is 5254/// an explicit specialization of the previous declaration. 5255/// 5256/// This sets NewFD->isInvalidDecl() to true if there was an error. 5257void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5258 LookupResult &Previous, 5259 bool IsExplicitSpecialization, 5260 bool &Redeclaration) { 5261 assert(!NewFD->getResultType()->isVariablyModifiedType() 5262 && "Variably modified return types are not handled here"); 5263 5264 // Check for a previous declaration of this name. 5265 if (Previous.empty() && NewFD->isExternC()) { 5266 // Since we did not find anything by this name and we're declaring 5267 // an extern "C" function, look for a non-visible extern "C" 5268 // declaration with the same name. 5269 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5270 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5271 if (Pos != LocallyScopedExternalDecls.end()) 5272 Previous.addDecl(Pos->second); 5273 } 5274 5275 // Merge or overload the declaration with an existing declaration of 5276 // the same name, if appropriate. 5277 if (!Previous.empty()) { 5278 // Determine whether NewFD is an overload of PrevDecl or 5279 // a declaration that requires merging. If it's an overload, 5280 // there's no more work to do here; we'll just add the new 5281 // function to the scope. 5282 5283 NamedDecl *OldDecl = 0; 5284 if (!AllowOverloadingOfFunction(Previous, Context)) { 5285 Redeclaration = true; 5286 OldDecl = Previous.getFoundDecl(); 5287 } else { 5288 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5289 /*NewIsUsingDecl*/ false)) { 5290 case Ovl_Match: 5291 Redeclaration = true; 5292 break; 5293 5294 case Ovl_NonFunction: 5295 Redeclaration = true; 5296 break; 5297 5298 case Ovl_Overload: 5299 Redeclaration = false; 5300 break; 5301 } 5302 5303 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5304 // If a function name is overloadable in C, then every function 5305 // with that name must be marked "overloadable". 5306 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5307 << Redeclaration << NewFD; 5308 NamedDecl *OverloadedDecl = 0; 5309 if (Redeclaration) 5310 OverloadedDecl = OldDecl; 5311 else if (!Previous.empty()) 5312 OverloadedDecl = Previous.getRepresentativeDecl(); 5313 if (OverloadedDecl) 5314 Diag(OverloadedDecl->getLocation(), 5315 diag::note_attribute_overloadable_prev_overload); 5316 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5317 Context)); 5318 } 5319 } 5320 5321 if (Redeclaration) { 5322 // NewFD and OldDecl represent declarations that need to be 5323 // merged. 5324 if (MergeFunctionDecl(NewFD, OldDecl)) 5325 return NewFD->setInvalidDecl(); 5326 5327 Previous.clear(); 5328 Previous.addDecl(OldDecl); 5329 5330 if (FunctionTemplateDecl *OldTemplateDecl 5331 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5332 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5333 FunctionTemplateDecl *NewTemplateDecl 5334 = NewFD->getDescribedFunctionTemplate(); 5335 assert(NewTemplateDecl && "Template/non-template mismatch"); 5336 if (CXXMethodDecl *Method 5337 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5338 Method->setAccess(OldTemplateDecl->getAccess()); 5339 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5340 } 5341 5342 // If this is an explicit specialization of a member that is a function 5343 // template, mark it as a member specialization. 5344 if (IsExplicitSpecialization && 5345 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5346 NewTemplateDecl->setMemberSpecialization(); 5347 assert(OldTemplateDecl->isMemberSpecialization()); 5348 } 5349 5350 if (OldTemplateDecl->isModulePrivate()) 5351 NewTemplateDecl->setModulePrivate(); 5352 5353 } else { 5354 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5355 NewFD->setAccess(OldDecl->getAccess()); 5356 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5357 } 5358 } 5359 } 5360 5361 // Semantic checking for this function declaration (in isolation). 5362 if (getLangOptions().CPlusPlus) { 5363 // C++-specific checks. 5364 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5365 CheckConstructor(Constructor); 5366 } else if (CXXDestructorDecl *Destructor = 5367 dyn_cast<CXXDestructorDecl>(NewFD)) { 5368 CXXRecordDecl *Record = Destructor->getParent(); 5369 QualType ClassType = Context.getTypeDeclType(Record); 5370 5371 // FIXME: Shouldn't we be able to perform this check even when the class 5372 // type is dependent? Both gcc and edg can handle that. 5373 if (!ClassType->isDependentType()) { 5374 DeclarationName Name 5375 = Context.DeclarationNames.getCXXDestructorName( 5376 Context.getCanonicalType(ClassType)); 5377 if (NewFD->getDeclName() != Name) { 5378 Diag(NewFD->getLocation(), diag::err_destructor_name); 5379 return NewFD->setInvalidDecl(); 5380 } 5381 } 5382 } else if (CXXConversionDecl *Conversion 5383 = dyn_cast<CXXConversionDecl>(NewFD)) { 5384 ActOnConversionDeclarator(Conversion); 5385 } 5386 5387 // Find any virtual functions that this function overrides. 5388 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5389 if (!Method->isFunctionTemplateSpecialization() && 5390 !Method->getDescribedFunctionTemplate()) { 5391 if (AddOverriddenMethods(Method->getParent(), Method)) { 5392 // If the function was marked as "static", we have a problem. 5393 if (NewFD->getStorageClass() == SC_Static) { 5394 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5395 << NewFD->getDeclName(); 5396 for (CXXMethodDecl::method_iterator 5397 Overridden = Method->begin_overridden_methods(), 5398 OverriddenEnd = Method->end_overridden_methods(); 5399 Overridden != OverriddenEnd; 5400 ++Overridden) { 5401 Diag((*Overridden)->getLocation(), 5402 diag::note_overridden_virtual_function); 5403 } 5404 } 5405 } 5406 } 5407 } 5408 5409 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5410 if (NewFD->isOverloadedOperator() && 5411 CheckOverloadedOperatorDeclaration(NewFD)) 5412 return NewFD->setInvalidDecl(); 5413 5414 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5415 if (NewFD->getLiteralIdentifier() && 5416 CheckLiteralOperatorDeclaration(NewFD)) 5417 return NewFD->setInvalidDecl(); 5418 5419 // In C++, check default arguments now that we have merged decls. Unless 5420 // the lexical context is the class, because in this case this is done 5421 // during delayed parsing anyway. 5422 if (!CurContext->isRecord()) 5423 CheckCXXDefaultArguments(NewFD); 5424 5425 // If this function declares a builtin function, check the type of this 5426 // declaration against the expected type for the builtin. 5427 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5428 ASTContext::GetBuiltinTypeError Error; 5429 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5430 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5431 // The type of this function differs from the type of the builtin, 5432 // so forget about the builtin entirely. 5433 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5434 } 5435 } 5436 } 5437} 5438 5439void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5440 // C++ [basic.start.main]p3: A program that declares main to be inline 5441 // or static is ill-formed. 5442 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5443 // shall not appear in a declaration of main. 5444 // static main is not an error under C99, but we should warn about it. 5445 if (FD->getStorageClass() == SC_Static) 5446 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5447 ? diag::err_static_main : diag::warn_static_main) 5448 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5449 if (FD->isInlineSpecified()) 5450 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5451 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5452 5453 QualType T = FD->getType(); 5454 assert(T->isFunctionType() && "function decl is not of function type"); 5455 const FunctionType* FT = T->getAs<FunctionType>(); 5456 5457 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5458 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5459 FD->setInvalidDecl(true); 5460 } 5461 5462 // Treat protoless main() as nullary. 5463 if (isa<FunctionNoProtoType>(FT)) return; 5464 5465 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5466 unsigned nparams = FTP->getNumArgs(); 5467 assert(FD->getNumParams() == nparams); 5468 5469 bool HasExtraParameters = (nparams > 3); 5470 5471 // Darwin passes an undocumented fourth argument of type char**. If 5472 // other platforms start sprouting these, the logic below will start 5473 // getting shifty. 5474 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5475 HasExtraParameters = false; 5476 5477 if (HasExtraParameters) { 5478 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5479 FD->setInvalidDecl(true); 5480 nparams = 3; 5481 } 5482 5483 // FIXME: a lot of the following diagnostics would be improved 5484 // if we had some location information about types. 5485 5486 QualType CharPP = 5487 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5488 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5489 5490 for (unsigned i = 0; i < nparams; ++i) { 5491 QualType AT = FTP->getArgType(i); 5492 5493 bool mismatch = true; 5494 5495 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5496 mismatch = false; 5497 else if (Expected[i] == CharPP) { 5498 // As an extension, the following forms are okay: 5499 // char const ** 5500 // char const * const * 5501 // char * const * 5502 5503 QualifierCollector qs; 5504 const PointerType* PT; 5505 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5506 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5507 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5508 qs.removeConst(); 5509 mismatch = !qs.empty(); 5510 } 5511 } 5512 5513 if (mismatch) { 5514 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5515 // TODO: suggest replacing given type with expected type 5516 FD->setInvalidDecl(true); 5517 } 5518 } 5519 5520 if (nparams == 1 && !FD->isInvalidDecl()) { 5521 Diag(FD->getLocation(), diag::warn_main_one_arg); 5522 } 5523 5524 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5525 Diag(FD->getLocation(), diag::err_main_template_decl); 5526 FD->setInvalidDecl(); 5527 } 5528} 5529 5530bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5531 // FIXME: Need strict checking. In C89, we need to check for 5532 // any assignment, increment, decrement, function-calls, or 5533 // commas outside of a sizeof. In C99, it's the same list, 5534 // except that the aforementioned are allowed in unevaluated 5535 // expressions. Everything else falls under the 5536 // "may accept other forms of constant expressions" exception. 5537 // (We never end up here for C++, so the constant expression 5538 // rules there don't matter.) 5539 if (Init->isConstantInitializer(Context, false)) 5540 return false; 5541 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5542 << Init->getSourceRange(); 5543 return true; 5544} 5545 5546namespace { 5547 // Visits an initialization expression to see if OrigDecl is evaluated in 5548 // its own initialization and throws a warning if it does. 5549 class SelfReferenceChecker 5550 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5551 Sema &S; 5552 Decl *OrigDecl; 5553 bool isRecordType; 5554 bool isPODType; 5555 5556 public: 5557 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5558 5559 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5560 S(S), OrigDecl(OrigDecl) { 5561 isPODType = false; 5562 isRecordType = false; 5563 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5564 isPODType = VD->getType().isPODType(S.Context); 5565 isRecordType = VD->getType()->isRecordType(); 5566 } 5567 } 5568 5569 void VisitExpr(Expr *E) { 5570 if (isa<ObjCMessageExpr>(*E)) return; 5571 if (isRecordType) { 5572 Expr *expr = E; 5573 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5574 ValueDecl *VD = ME->getMemberDecl(); 5575 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5576 expr = ME->getBase(); 5577 } 5578 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5579 HandleDeclRefExpr(DRE); 5580 return; 5581 } 5582 } 5583 Inherited::VisitExpr(E); 5584 } 5585 5586 void VisitMemberExpr(MemberExpr *E) { 5587 if (E->getType()->canDecayToPointerType()) return; 5588 if (isa<FieldDecl>(E->getMemberDecl())) 5589 if (DeclRefExpr *DRE 5590 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5591 HandleDeclRefExpr(DRE); 5592 return; 5593 } 5594 Inherited::VisitMemberExpr(E); 5595 } 5596 5597 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5598 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5599 (isRecordType && E->getCastKind() == CK_NoOp)) { 5600 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5601 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5602 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5603 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5604 HandleDeclRefExpr(DRE); 5605 return; 5606 } 5607 } 5608 Inherited::VisitImplicitCastExpr(E); 5609 } 5610 5611 void VisitUnaryOperator(UnaryOperator *E) { 5612 // For POD record types, addresses of its own members are well-defined. 5613 if (isRecordType && isPODType) return; 5614 Inherited::VisitUnaryOperator(E); 5615 } 5616 5617 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5618 Decl* ReferenceDecl = DRE->getDecl(); 5619 if (OrigDecl != ReferenceDecl) return; 5620 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5621 Sema::NotForRedeclaration); 5622 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5623 S.PDiag(diag::warn_uninit_self_reference_in_init) 5624 << Result.getLookupName() 5625 << OrigDecl->getLocation() 5626 << DRE->getSourceRange()); 5627 } 5628 }; 5629} 5630 5631/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5632void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5633 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5634} 5635 5636/// AddInitializerToDecl - Adds the initializer Init to the 5637/// declaration dcl. If DirectInit is true, this is C++ direct 5638/// initialization rather than copy initialization. 5639void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5640 bool DirectInit, bool TypeMayContainAuto) { 5641 // If there is no declaration, there was an error parsing it. Just ignore 5642 // the initializer. 5643 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5644 return; 5645 5646 // Check for self-references within variable initializers. 5647 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5648 // Variables declared within a function/method body are handled 5649 // by a dataflow analysis. 5650 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5651 CheckSelfReference(RealDecl, Init); 5652 } 5653 else { 5654 CheckSelfReference(RealDecl, Init); 5655 } 5656 5657 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5658 // With declarators parsed the way they are, the parser cannot 5659 // distinguish between a normal initializer and a pure-specifier. 5660 // Thus this grotesque test. 5661 IntegerLiteral *IL; 5662 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5663 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5664 CheckPureMethod(Method, Init->getSourceRange()); 5665 else { 5666 Diag(Method->getLocation(), diag::err_member_function_initialization) 5667 << Method->getDeclName() << Init->getSourceRange(); 5668 Method->setInvalidDecl(); 5669 } 5670 return; 5671 } 5672 5673 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5674 if (!VDecl) { 5675 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5676 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5677 RealDecl->setInvalidDecl(); 5678 return; 5679 } 5680 5681 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5682 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5683 TypeSourceInfo *DeducedType = 0; 5684 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5685 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5686 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5687 << Init->getSourceRange(); 5688 if (!DeducedType) { 5689 RealDecl->setInvalidDecl(); 5690 return; 5691 } 5692 VDecl->setTypeSourceInfo(DeducedType); 5693 VDecl->setType(DeducedType->getType()); 5694 5695 // In ARC, infer lifetime. 5696 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5697 VDecl->setInvalidDecl(); 5698 5699 // If this is a redeclaration, check that the type we just deduced matches 5700 // the previously declared type. 5701 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5702 MergeVarDeclTypes(VDecl, Old); 5703 } 5704 5705 5706 // A definition must end up with a complete type, which means it must be 5707 // complete with the restriction that an array type might be completed by the 5708 // initializer; note that later code assumes this restriction. 5709 QualType BaseDeclType = VDecl->getType(); 5710 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5711 BaseDeclType = Array->getElementType(); 5712 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5713 diag::err_typecheck_decl_incomplete_type)) { 5714 RealDecl->setInvalidDecl(); 5715 return; 5716 } 5717 5718 // The variable can not have an abstract class type. 5719 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5720 diag::err_abstract_type_in_decl, 5721 AbstractVariableType)) 5722 VDecl->setInvalidDecl(); 5723 5724 const VarDecl *Def; 5725 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5726 Diag(VDecl->getLocation(), diag::err_redefinition) 5727 << VDecl->getDeclName(); 5728 Diag(Def->getLocation(), diag::note_previous_definition); 5729 VDecl->setInvalidDecl(); 5730 return; 5731 } 5732 5733 const VarDecl* PrevInit = 0; 5734 if (getLangOptions().CPlusPlus) { 5735 // C++ [class.static.data]p4 5736 // If a static data member is of const integral or const 5737 // enumeration type, its declaration in the class definition can 5738 // specify a constant-initializer which shall be an integral 5739 // constant expression (5.19). In that case, the member can appear 5740 // in integral constant expressions. The member shall still be 5741 // defined in a namespace scope if it is used in the program and the 5742 // namespace scope definition shall not contain an initializer. 5743 // 5744 // We already performed a redefinition check above, but for static 5745 // data members we also need to check whether there was an in-class 5746 // declaration with an initializer. 5747 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5748 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5749 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5750 return; 5751 } 5752 5753 if (VDecl->hasLocalStorage()) 5754 getCurFunction()->setHasBranchProtectedScope(); 5755 5756 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5757 VDecl->setInvalidDecl(); 5758 return; 5759 } 5760 } 5761 5762 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5763 // a kernel function cannot be initialized." 5764 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5765 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5766 VDecl->setInvalidDecl(); 5767 return; 5768 } 5769 5770 // Capture the variable that is being initialized and the style of 5771 // initialization. 5772 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5773 5774 // FIXME: Poor source location information. 5775 InitializationKind Kind 5776 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5777 Init->getLocStart(), 5778 Init->getLocEnd()) 5779 : InitializationKind::CreateCopy(VDecl->getLocation(), 5780 Init->getLocStart()); 5781 5782 // Get the decls type and save a reference for later, since 5783 // CheckInitializerTypes may change it. 5784 QualType DclT = VDecl->getType(), SavT = DclT; 5785 if (VDecl->isLocalVarDecl()) { 5786 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5787 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5788 VDecl->setInvalidDecl(); 5789 } else if (!VDecl->isInvalidDecl()) { 5790 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5791 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5792 MultiExprArg(*this, &Init, 1), 5793 &DclT); 5794 if (Result.isInvalid()) { 5795 VDecl->setInvalidDecl(); 5796 return; 5797 } 5798 5799 Init = Result.takeAs<Expr>(); 5800 5801 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5802 // Don't check invalid declarations to avoid emitting useless diagnostics. 5803 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5804 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5805 CheckForConstantInitializer(Init, DclT); 5806 } 5807 } 5808 } else if (VDecl->isStaticDataMember() && 5809 VDecl->getLexicalDeclContext()->isRecord()) { 5810 // This is an in-class initialization for a static data member, e.g., 5811 // 5812 // struct S { 5813 // static const int value = 17; 5814 // }; 5815 5816 // Try to perform the initialization regardless. 5817 if (!VDecl->isInvalidDecl()) { 5818 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5819 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5820 MultiExprArg(*this, &Init, 1), 5821 &DclT); 5822 if (Result.isInvalid()) { 5823 VDecl->setInvalidDecl(); 5824 return; 5825 } 5826 5827 Init = Result.takeAs<Expr>(); 5828 } 5829 5830 // C++ [class.mem]p4: 5831 // A member-declarator can contain a constant-initializer only 5832 // if it declares a static member (9.4) of const integral or 5833 // const enumeration type, see 9.4.2. 5834 // 5835 // C++0x [class.static.data]p3: 5836 // If a non-volatile const static data member is of integral or 5837 // enumeration type, its declaration in the class definition can 5838 // specify a brace-or-equal-initializer in which every initalizer-clause 5839 // that is an assignment-expression is a constant expression. A static 5840 // data member of literal type can be declared in the class definition 5841 // with the constexpr specifier; if so, its declaration shall specify a 5842 // brace-or-equal-initializer in which every initializer-clause that is 5843 // an assignment-expression is a constant expression. 5844 QualType T = VDecl->getType(); 5845 5846 // Do nothing on dependent types. 5847 if (T->isDependentType()) { 5848 5849 // Allow any 'static constexpr' members, whether or not they are of literal 5850 // type. We separately check that the initializer is a constant expression, 5851 // which implicitly requires the member to be of literal type. 5852 } else if (VDecl->isConstexpr()) { 5853 5854 // Require constness. 5855 } else if (!T.isConstQualified()) { 5856 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5857 << Init->getSourceRange(); 5858 VDecl->setInvalidDecl(); 5859 5860 // We allow integer constant expressions in all cases. 5861 } else if (T->isIntegralOrEnumerationType()) { 5862 // Check whether the expression is a constant expression. 5863 SourceLocation Loc; 5864 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 5865 // In C++0x, a non-constexpr const static data member with an 5866 // in-class initializer cannot be volatile. 5867 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 5868 else if (Init->isValueDependent()) 5869 ; // Nothing to check. 5870 else if (Init->isIntegerConstantExpr(Context, &Loc)) 5871 ; // Ok, it's an ICE! 5872 else if (Init->isEvaluatable(Context)) { 5873 // If we can constant fold the initializer through heroics, accept it, 5874 // but report this as a use of an extension for -pedantic. 5875 Diag(Loc, diag::ext_in_class_initializer_non_constant) 5876 << Init->getSourceRange(); 5877 } else { 5878 // Otherwise, this is some crazy unknown case. Report the issue at the 5879 // location provided by the isIntegerConstantExpr failed check. 5880 Diag(Loc, diag::err_in_class_initializer_non_constant) 5881 << Init->getSourceRange(); 5882 VDecl->setInvalidDecl(); 5883 } 5884 5885 // We allow floating-point constants as an extension. 5886 } else if (T->isFloatingType()) { // also permits complex, which is ok 5887 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5888 << T << Init->getSourceRange(); 5889 if (getLangOptions().CPlusPlus0x) 5890 Diag(VDecl->getLocation(), 5891 diag::note_in_class_initializer_float_type_constexpr) 5892 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 5893 5894 if (!Init->isValueDependent() && 5895 !Init->isConstantInitializer(Context, false)) { 5896 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5897 << Init->getSourceRange(); 5898 VDecl->setInvalidDecl(); 5899 } 5900 5901 // Suggest adding 'constexpr' in C++0x for literal types. 5902 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 5903 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 5904 << T << Init->getSourceRange() 5905 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 5906 VDecl->setConstexpr(true); 5907 5908 } else { 5909 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5910 << T << Init->getSourceRange(); 5911 VDecl->setInvalidDecl(); 5912 } 5913 } else if (VDecl->isFileVarDecl()) { 5914 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5915 (!getLangOptions().CPlusPlus || 5916 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5917 Diag(VDecl->getLocation(), diag::warn_extern_init); 5918 if (!VDecl->isInvalidDecl()) { 5919 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5920 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5921 MultiExprArg(*this, &Init, 1), 5922 &DclT); 5923 if (Result.isInvalid()) { 5924 VDecl->setInvalidDecl(); 5925 return; 5926 } 5927 5928 Init = Result.takeAs<Expr>(); 5929 } 5930 5931 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5932 // Don't check invalid declarations to avoid emitting useless diagnostics. 5933 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5934 // C99 6.7.8p4. All file scoped initializers need to be constant. 5935 CheckForConstantInitializer(Init, DclT); 5936 } 5937 } 5938 // If the type changed, it means we had an incomplete type that was 5939 // completed by the initializer. For example: 5940 // int ary[] = { 1, 3, 5 }; 5941 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5942 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5943 VDecl->setType(DclT); 5944 Init->setType(DclT); 5945 } 5946 5947 // Check any implicit conversions within the expression. 5948 CheckImplicitConversions(Init, VDecl->getLocation()); 5949 5950 if (!VDecl->isInvalidDecl()) 5951 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 5952 5953 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 5954 !VDecl->getType()->isDependentType() && 5955 !Init->isTypeDependent() && !Init->isValueDependent() && 5956 !Init->isConstantInitializer(Context, 5957 VDecl->getType()->isReferenceType())) { 5958 // FIXME: Improve this diagnostic to explain why the initializer is not 5959 // a constant expression. 5960 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 5961 << VDecl << Init->getSourceRange(); 5962 } 5963 5964 Init = MaybeCreateExprWithCleanups(Init); 5965 // Attach the initializer to the decl. 5966 VDecl->setInit(Init); 5967 5968 CheckCompleteVariableDeclaration(VDecl); 5969} 5970 5971/// ActOnInitializerError - Given that there was an error parsing an 5972/// initializer for the given declaration, try to return to some form 5973/// of sanity. 5974void Sema::ActOnInitializerError(Decl *D) { 5975 // Our main concern here is re-establishing invariants like "a 5976 // variable's type is either dependent or complete". 5977 if (!D || D->isInvalidDecl()) return; 5978 5979 VarDecl *VD = dyn_cast<VarDecl>(D); 5980 if (!VD) return; 5981 5982 // Auto types are meaningless if we can't make sense of the initializer. 5983 if (ParsingInitForAutoVars.count(D)) { 5984 D->setInvalidDecl(); 5985 return; 5986 } 5987 5988 QualType Ty = VD->getType(); 5989 if (Ty->isDependentType()) return; 5990 5991 // Require a complete type. 5992 if (RequireCompleteType(VD->getLocation(), 5993 Context.getBaseElementType(Ty), 5994 diag::err_typecheck_decl_incomplete_type)) { 5995 VD->setInvalidDecl(); 5996 return; 5997 } 5998 5999 // Require an abstract type. 6000 if (RequireNonAbstractType(VD->getLocation(), Ty, 6001 diag::err_abstract_type_in_decl, 6002 AbstractVariableType)) { 6003 VD->setInvalidDecl(); 6004 return; 6005 } 6006 6007 // Don't bother complaining about constructors or destructors, 6008 // though. 6009} 6010 6011void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6012 bool TypeMayContainAuto) { 6013 // If there is no declaration, there was an error parsing it. Just ignore it. 6014 if (RealDecl == 0) 6015 return; 6016 6017 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6018 QualType Type = Var->getType(); 6019 6020 // C++0x [dcl.spec.auto]p3 6021 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6022 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6023 << Var->getDeclName() << Type; 6024 Var->setInvalidDecl(); 6025 return; 6026 } 6027 6028 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6029 // have an initializer. 6030 // C++0x [class.static.data]p3: A static data member can be declared with 6031 // the constexpr specifier; if so, its declaration shall specify 6032 // a brace-or-equal-initializer. 6033 if (Var->isConstexpr()) { 6034 // FIXME: Provide fix-its to convert the constexpr to const. 6035 if (Var->isStaticDataMember() && Var->getAnyInitializer()) { 6036 Diag(Var->getLocation(), diag::err_constexpr_initialized_static_member) 6037 << Var->getDeclName(); 6038 } else { 6039 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6040 << Var->getDeclName(); 6041 } 6042 Var->setInvalidDecl(); 6043 return; 6044 } 6045 6046 switch (Var->isThisDeclarationADefinition()) { 6047 case VarDecl::Definition: 6048 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6049 break; 6050 6051 // We have an out-of-line definition of a static data member 6052 // that has an in-class initializer, so we type-check this like 6053 // a declaration. 6054 // 6055 // Fall through 6056 6057 case VarDecl::DeclarationOnly: 6058 // It's only a declaration. 6059 6060 // Block scope. C99 6.7p7: If an identifier for an object is 6061 // declared with no linkage (C99 6.2.2p6), the type for the 6062 // object shall be complete. 6063 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6064 !Var->getLinkage() && !Var->isInvalidDecl() && 6065 RequireCompleteType(Var->getLocation(), Type, 6066 diag::err_typecheck_decl_incomplete_type)) 6067 Var->setInvalidDecl(); 6068 6069 // Make sure that the type is not abstract. 6070 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6071 RequireNonAbstractType(Var->getLocation(), Type, 6072 diag::err_abstract_type_in_decl, 6073 AbstractVariableType)) 6074 Var->setInvalidDecl(); 6075 return; 6076 6077 case VarDecl::TentativeDefinition: 6078 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6079 // object that has file scope without an initializer, and without a 6080 // storage-class specifier or with the storage-class specifier "static", 6081 // constitutes a tentative definition. Note: A tentative definition with 6082 // external linkage is valid (C99 6.2.2p5). 6083 if (!Var->isInvalidDecl()) { 6084 if (const IncompleteArrayType *ArrayT 6085 = Context.getAsIncompleteArrayType(Type)) { 6086 if (RequireCompleteType(Var->getLocation(), 6087 ArrayT->getElementType(), 6088 diag::err_illegal_decl_array_incomplete_type)) 6089 Var->setInvalidDecl(); 6090 } else if (Var->getStorageClass() == SC_Static) { 6091 // C99 6.9.2p3: If the declaration of an identifier for an object is 6092 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6093 // declared type shall not be an incomplete type. 6094 // NOTE: code such as the following 6095 // static struct s; 6096 // struct s { int a; }; 6097 // is accepted by gcc. Hence here we issue a warning instead of 6098 // an error and we do not invalidate the static declaration. 6099 // NOTE: to avoid multiple warnings, only check the first declaration. 6100 if (Var->getPreviousDeclaration() == 0) 6101 RequireCompleteType(Var->getLocation(), Type, 6102 diag::ext_typecheck_decl_incomplete_type); 6103 } 6104 } 6105 6106 // Record the tentative definition; we're done. 6107 if (!Var->isInvalidDecl()) 6108 TentativeDefinitions.push_back(Var); 6109 return; 6110 } 6111 6112 // Provide a specific diagnostic for uninitialized variable 6113 // definitions with incomplete array type. 6114 if (Type->isIncompleteArrayType()) { 6115 Diag(Var->getLocation(), 6116 diag::err_typecheck_incomplete_array_needs_initializer); 6117 Var->setInvalidDecl(); 6118 return; 6119 } 6120 6121 // Provide a specific diagnostic for uninitialized variable 6122 // definitions with reference type. 6123 if (Type->isReferenceType()) { 6124 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6125 << Var->getDeclName() 6126 << SourceRange(Var->getLocation(), Var->getLocation()); 6127 Var->setInvalidDecl(); 6128 return; 6129 } 6130 6131 // Do not attempt to type-check the default initializer for a 6132 // variable with dependent type. 6133 if (Type->isDependentType()) 6134 return; 6135 6136 if (Var->isInvalidDecl()) 6137 return; 6138 6139 if (RequireCompleteType(Var->getLocation(), 6140 Context.getBaseElementType(Type), 6141 diag::err_typecheck_decl_incomplete_type)) { 6142 Var->setInvalidDecl(); 6143 return; 6144 } 6145 6146 // The variable can not have an abstract class type. 6147 if (RequireNonAbstractType(Var->getLocation(), Type, 6148 diag::err_abstract_type_in_decl, 6149 AbstractVariableType)) { 6150 Var->setInvalidDecl(); 6151 return; 6152 } 6153 6154 // Check for jumps past the implicit initializer. C++0x 6155 // clarifies that this applies to a "variable with automatic 6156 // storage duration", not a "local variable". 6157 // C++0x [stmt.dcl]p3 6158 // A program that jumps from a point where a variable with automatic 6159 // storage duration is not in scope to a point where it is in scope is 6160 // ill-formed unless the variable has scalar type, class type with a 6161 // trivial default constructor and a trivial destructor, a cv-qualified 6162 // version of one of these types, or an array of one of the preceding 6163 // types and is declared without an initializer. 6164 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6165 if (const RecordType *Record 6166 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6167 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6168 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 6169 (getLangOptions().CPlusPlus0x && 6170 (!CXXRecord->hasTrivialDefaultConstructor() || 6171 !CXXRecord->hasTrivialDestructor()))) 6172 getCurFunction()->setHasBranchProtectedScope(); 6173 } 6174 } 6175 6176 // C++03 [dcl.init]p9: 6177 // If no initializer is specified for an object, and the 6178 // object is of (possibly cv-qualified) non-POD class type (or 6179 // array thereof), the object shall be default-initialized; if 6180 // the object is of const-qualified type, the underlying class 6181 // type shall have a user-declared default 6182 // constructor. Otherwise, if no initializer is specified for 6183 // a non- static object, the object and its subobjects, if 6184 // any, have an indeterminate initial value); if the object 6185 // or any of its subobjects are of const-qualified type, the 6186 // program is ill-formed. 6187 // C++0x [dcl.init]p11: 6188 // If no initializer is specified for an object, the object is 6189 // default-initialized; [...]. 6190 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6191 InitializationKind Kind 6192 = InitializationKind::CreateDefault(Var->getLocation()); 6193 6194 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6195 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6196 MultiExprArg(*this, 0, 0)); 6197 if (Init.isInvalid()) 6198 Var->setInvalidDecl(); 6199 else if (Init.get()) 6200 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6201 6202 CheckCompleteVariableDeclaration(Var); 6203 } 6204} 6205 6206void Sema::ActOnCXXForRangeDecl(Decl *D) { 6207 VarDecl *VD = dyn_cast<VarDecl>(D); 6208 if (!VD) { 6209 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6210 D->setInvalidDecl(); 6211 return; 6212 } 6213 6214 VD->setCXXForRangeDecl(true); 6215 6216 // for-range-declaration cannot be given a storage class specifier. 6217 int Error = -1; 6218 switch (VD->getStorageClassAsWritten()) { 6219 case SC_None: 6220 break; 6221 case SC_Extern: 6222 Error = 0; 6223 break; 6224 case SC_Static: 6225 Error = 1; 6226 break; 6227 case SC_PrivateExtern: 6228 Error = 2; 6229 break; 6230 case SC_Auto: 6231 Error = 3; 6232 break; 6233 case SC_Register: 6234 Error = 4; 6235 break; 6236 case SC_OpenCLWorkGroupLocal: 6237 llvm_unreachable("Unexpected storage class"); 6238 } 6239 if (VD->isConstexpr()) 6240 Error = 5; 6241 if (Error != -1) { 6242 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6243 << VD->getDeclName() << Error; 6244 D->setInvalidDecl(); 6245 } 6246} 6247 6248void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6249 if (var->isInvalidDecl()) return; 6250 6251 // In ARC, don't allow jumps past the implicit initialization of a 6252 // local retaining variable. 6253 if (getLangOptions().ObjCAutoRefCount && 6254 var->hasLocalStorage()) { 6255 switch (var->getType().getObjCLifetime()) { 6256 case Qualifiers::OCL_None: 6257 case Qualifiers::OCL_ExplicitNone: 6258 case Qualifiers::OCL_Autoreleasing: 6259 break; 6260 6261 case Qualifiers::OCL_Weak: 6262 case Qualifiers::OCL_Strong: 6263 getCurFunction()->setHasBranchProtectedScope(); 6264 break; 6265 } 6266 } 6267 6268 // All the following checks are C++ only. 6269 if (!getLangOptions().CPlusPlus) return; 6270 6271 QualType baseType = Context.getBaseElementType(var->getType()); 6272 if (baseType->isDependentType()) return; 6273 6274 // __block variables might require us to capture a copy-initializer. 6275 if (var->hasAttr<BlocksAttr>()) { 6276 // It's currently invalid to ever have a __block variable with an 6277 // array type; should we diagnose that here? 6278 6279 // Regardless, we don't want to ignore array nesting when 6280 // constructing this copy. 6281 QualType type = var->getType(); 6282 6283 if (type->isStructureOrClassType()) { 6284 SourceLocation poi = var->getLocation(); 6285 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6286 ExprResult result = 6287 PerformCopyInitialization( 6288 InitializedEntity::InitializeBlock(poi, type, false), 6289 poi, Owned(varRef)); 6290 if (!result.isInvalid()) { 6291 result = MaybeCreateExprWithCleanups(result); 6292 Expr *init = result.takeAs<Expr>(); 6293 Context.setBlockVarCopyInits(var, init); 6294 } 6295 } 6296 } 6297 6298 // Check for global constructors. 6299 if (!var->getDeclContext()->isDependentContext() && 6300 var->hasGlobalStorage() && 6301 !var->isStaticLocal() && 6302 var->getInit() && 6303 !var->getInit()->isConstantInitializer(Context, 6304 baseType->isReferenceType())) 6305 Diag(var->getLocation(), diag::warn_global_constructor) 6306 << var->getInit()->getSourceRange(); 6307 6308 // Require the destructor. 6309 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6310 FinalizeVarWithDestructor(var, recordType); 6311} 6312 6313/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6314/// any semantic actions necessary after any initializer has been attached. 6315void 6316Sema::FinalizeDeclaration(Decl *ThisDecl) { 6317 // Note that we are no longer parsing the initializer for this declaration. 6318 ParsingInitForAutoVars.erase(ThisDecl); 6319} 6320 6321Sema::DeclGroupPtrTy 6322Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6323 Decl **Group, unsigned NumDecls) { 6324 SmallVector<Decl*, 8> Decls; 6325 6326 if (DS.isTypeSpecOwned()) 6327 Decls.push_back(DS.getRepAsDecl()); 6328 6329 for (unsigned i = 0; i != NumDecls; ++i) 6330 if (Decl *D = Group[i]) 6331 Decls.push_back(D); 6332 6333 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6334 DS.getTypeSpecType() == DeclSpec::TST_auto); 6335} 6336 6337/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6338/// group, performing any necessary semantic checking. 6339Sema::DeclGroupPtrTy 6340Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6341 bool TypeMayContainAuto) { 6342 // C++0x [dcl.spec.auto]p7: 6343 // If the type deduced for the template parameter U is not the same in each 6344 // deduction, the program is ill-formed. 6345 // FIXME: When initializer-list support is added, a distinction is needed 6346 // between the deduced type U and the deduced type which 'auto' stands for. 6347 // auto a = 0, b = { 1, 2, 3 }; 6348 // is legal because the deduced type U is 'int' in both cases. 6349 if (TypeMayContainAuto && NumDecls > 1) { 6350 QualType Deduced; 6351 CanQualType DeducedCanon; 6352 VarDecl *DeducedDecl = 0; 6353 for (unsigned i = 0; i != NumDecls; ++i) { 6354 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6355 AutoType *AT = D->getType()->getContainedAutoType(); 6356 // Don't reissue diagnostics when instantiating a template. 6357 if (AT && D->isInvalidDecl()) 6358 break; 6359 if (AT && AT->isDeduced()) { 6360 QualType U = AT->getDeducedType(); 6361 CanQualType UCanon = Context.getCanonicalType(U); 6362 if (Deduced.isNull()) { 6363 Deduced = U; 6364 DeducedCanon = UCanon; 6365 DeducedDecl = D; 6366 } else if (DeducedCanon != UCanon) { 6367 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6368 diag::err_auto_different_deductions) 6369 << Deduced << DeducedDecl->getDeclName() 6370 << U << D->getDeclName() 6371 << DeducedDecl->getInit()->getSourceRange() 6372 << D->getInit()->getSourceRange(); 6373 D->setInvalidDecl(); 6374 break; 6375 } 6376 } 6377 } 6378 } 6379 } 6380 6381 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6382} 6383 6384 6385/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6386/// to introduce parameters into function prototype scope. 6387Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6388 const DeclSpec &DS = D.getDeclSpec(); 6389 6390 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6391 VarDecl::StorageClass StorageClass = SC_None; 6392 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6393 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6394 StorageClass = SC_Register; 6395 StorageClassAsWritten = SC_Register; 6396 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6397 Diag(DS.getStorageClassSpecLoc(), 6398 diag::err_invalid_storage_class_in_func_decl); 6399 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6400 } 6401 6402 if (D.getDeclSpec().isThreadSpecified()) 6403 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6404 if (D.getDeclSpec().isConstexprSpecified()) 6405 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6406 << 0; 6407 6408 DiagnoseFunctionSpecifiers(D); 6409 6410 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6411 QualType parmDeclType = TInfo->getType(); 6412 6413 if (getLangOptions().CPlusPlus) { 6414 // Check that there are no default arguments inside the type of this 6415 // parameter. 6416 CheckExtraCXXDefaultArguments(D); 6417 6418 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6419 if (D.getCXXScopeSpec().isSet()) { 6420 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6421 << D.getCXXScopeSpec().getRange(); 6422 D.getCXXScopeSpec().clear(); 6423 } 6424 } 6425 6426 // Ensure we have a valid name 6427 IdentifierInfo *II = 0; 6428 if (D.hasName()) { 6429 II = D.getIdentifier(); 6430 if (!II) { 6431 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6432 << GetNameForDeclarator(D).getName().getAsString(); 6433 D.setInvalidType(true); 6434 } 6435 } 6436 6437 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6438 if (II) { 6439 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6440 ForRedeclaration); 6441 LookupName(R, S); 6442 if (R.isSingleResult()) { 6443 NamedDecl *PrevDecl = R.getFoundDecl(); 6444 if (PrevDecl->isTemplateParameter()) { 6445 // Maybe we will complain about the shadowed template parameter. 6446 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6447 // Just pretend that we didn't see the previous declaration. 6448 PrevDecl = 0; 6449 } else if (S->isDeclScope(PrevDecl)) { 6450 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6451 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6452 6453 // Recover by removing the name 6454 II = 0; 6455 D.SetIdentifier(0, D.getIdentifierLoc()); 6456 D.setInvalidType(true); 6457 } 6458 } 6459 } 6460 6461 // Temporarily put parameter variables in the translation unit, not 6462 // the enclosing context. This prevents them from accidentally 6463 // looking like class members in C++. 6464 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6465 D.getSourceRange().getBegin(), 6466 D.getIdentifierLoc(), II, 6467 parmDeclType, TInfo, 6468 StorageClass, StorageClassAsWritten); 6469 6470 if (D.isInvalidType()) 6471 New->setInvalidDecl(); 6472 6473 assert(S->isFunctionPrototypeScope()); 6474 assert(S->getFunctionPrototypeDepth() >= 1); 6475 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6476 S->getNextFunctionPrototypeIndex()); 6477 6478 // Add the parameter declaration into this scope. 6479 S->AddDecl(New); 6480 if (II) 6481 IdResolver.AddDecl(New); 6482 6483 ProcessDeclAttributes(S, New, D); 6484 6485 if (D.getDeclSpec().isModulePrivateSpecified()) 6486 Diag(New->getLocation(), diag::err_module_private_local) 6487 << 1 << New->getDeclName() 6488 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6489 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6490 6491 if (New->hasAttr<BlocksAttr>()) { 6492 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6493 } 6494 return New; 6495} 6496 6497/// \brief Synthesizes a variable for a parameter arising from a 6498/// typedef. 6499ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6500 SourceLocation Loc, 6501 QualType T) { 6502 /* FIXME: setting StartLoc == Loc. 6503 Would it be worth to modify callers so as to provide proper source 6504 location for the unnamed parameters, embedding the parameter's type? */ 6505 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6506 T, Context.getTrivialTypeSourceInfo(T, Loc), 6507 SC_None, SC_None, 0); 6508 Param->setImplicit(); 6509 return Param; 6510} 6511 6512void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6513 ParmVarDecl * const *ParamEnd) { 6514 // Don't diagnose unused-parameter errors in template instantiations; we 6515 // will already have done so in the template itself. 6516 if (!ActiveTemplateInstantiations.empty()) 6517 return; 6518 6519 for (; Param != ParamEnd; ++Param) { 6520 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6521 !(*Param)->hasAttr<UnusedAttr>()) { 6522 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6523 << (*Param)->getDeclName(); 6524 } 6525 } 6526} 6527 6528void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6529 ParmVarDecl * const *ParamEnd, 6530 QualType ReturnTy, 6531 NamedDecl *D) { 6532 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6533 return; 6534 6535 // Warn if the return value is pass-by-value and larger than the specified 6536 // threshold. 6537 if (ReturnTy.isPODType(Context)) { 6538 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6539 if (Size > LangOpts.NumLargeByValueCopy) 6540 Diag(D->getLocation(), diag::warn_return_value_size) 6541 << D->getDeclName() << Size; 6542 } 6543 6544 // Warn if any parameter is pass-by-value and larger than the specified 6545 // threshold. 6546 for (; Param != ParamEnd; ++Param) { 6547 QualType T = (*Param)->getType(); 6548 if (!T.isPODType(Context)) 6549 continue; 6550 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6551 if (Size > LangOpts.NumLargeByValueCopy) 6552 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6553 << (*Param)->getDeclName() << Size; 6554 } 6555} 6556 6557ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6558 SourceLocation NameLoc, IdentifierInfo *Name, 6559 QualType T, TypeSourceInfo *TSInfo, 6560 VarDecl::StorageClass StorageClass, 6561 VarDecl::StorageClass StorageClassAsWritten) { 6562 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6563 if (getLangOptions().ObjCAutoRefCount && 6564 T.getObjCLifetime() == Qualifiers::OCL_None && 6565 T->isObjCLifetimeType()) { 6566 6567 Qualifiers::ObjCLifetime lifetime; 6568 6569 // Special cases for arrays: 6570 // - if it's const, use __unsafe_unretained 6571 // - otherwise, it's an error 6572 if (T->isArrayType()) { 6573 if (!T.isConstQualified()) { 6574 Diag(NameLoc, diag::err_arc_array_param_no_ownership) 6575 << TSInfo->getTypeLoc().getSourceRange(); 6576 } 6577 lifetime = Qualifiers::OCL_ExplicitNone; 6578 } else { 6579 lifetime = T->getObjCARCImplicitLifetime(); 6580 } 6581 T = Context.getLifetimeQualifiedType(T, lifetime); 6582 } 6583 6584 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6585 Context.getAdjustedParameterType(T), 6586 TSInfo, 6587 StorageClass, StorageClassAsWritten, 6588 0); 6589 6590 // Parameters can not be abstract class types. 6591 // For record types, this is done by the AbstractClassUsageDiagnoser once 6592 // the class has been completely parsed. 6593 if (!CurContext->isRecord() && 6594 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6595 AbstractParamType)) 6596 New->setInvalidDecl(); 6597 6598 // Parameter declarators cannot be interface types. All ObjC objects are 6599 // passed by reference. 6600 if (T->isObjCObjectType()) { 6601 Diag(NameLoc, 6602 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6603 << FixItHint::CreateInsertion(NameLoc, "*"); 6604 T = Context.getObjCObjectPointerType(T); 6605 New->setType(T); 6606 } 6607 6608 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6609 // duration shall not be qualified by an address-space qualifier." 6610 // Since all parameters have automatic store duration, they can not have 6611 // an address space. 6612 if (T.getAddressSpace() != 0) { 6613 Diag(NameLoc, diag::err_arg_with_address_space); 6614 New->setInvalidDecl(); 6615 } 6616 6617 return New; 6618} 6619 6620void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6621 SourceLocation LocAfterDecls) { 6622 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6623 6624 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6625 // for a K&R function. 6626 if (!FTI.hasPrototype) { 6627 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6628 --i; 6629 if (FTI.ArgInfo[i].Param == 0) { 6630 llvm::SmallString<256> Code; 6631 llvm::raw_svector_ostream(Code) << " int " 6632 << FTI.ArgInfo[i].Ident->getName() 6633 << ";\n"; 6634 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6635 << FTI.ArgInfo[i].Ident 6636 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6637 6638 // Implicitly declare the argument as type 'int' for lack of a better 6639 // type. 6640 AttributeFactory attrs; 6641 DeclSpec DS(attrs); 6642 const char* PrevSpec; // unused 6643 unsigned DiagID; // unused 6644 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6645 PrevSpec, DiagID); 6646 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6647 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6648 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6649 } 6650 } 6651 } 6652} 6653 6654Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6655 Declarator &D) { 6656 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6657 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6658 Scope *ParentScope = FnBodyScope->getParent(); 6659 6660 Decl *DP = HandleDeclarator(ParentScope, D, 6661 MultiTemplateParamsArg(*this), 6662 /*IsFunctionDefinition=*/true); 6663 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6664} 6665 6666static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6667 // Don't warn about invalid declarations. 6668 if (FD->isInvalidDecl()) 6669 return false; 6670 6671 // Or declarations that aren't global. 6672 if (!FD->isGlobal()) 6673 return false; 6674 6675 // Don't warn about C++ member functions. 6676 if (isa<CXXMethodDecl>(FD)) 6677 return false; 6678 6679 // Don't warn about 'main'. 6680 if (FD->isMain()) 6681 return false; 6682 6683 // Don't warn about inline functions. 6684 if (FD->isInlined()) 6685 return false; 6686 6687 // Don't warn about function templates. 6688 if (FD->getDescribedFunctionTemplate()) 6689 return false; 6690 6691 // Don't warn about function template specializations. 6692 if (FD->isFunctionTemplateSpecialization()) 6693 return false; 6694 6695 bool MissingPrototype = true; 6696 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6697 Prev; Prev = Prev->getPreviousDeclaration()) { 6698 // Ignore any declarations that occur in function or method 6699 // scope, because they aren't visible from the header. 6700 if (Prev->getDeclContext()->isFunctionOrMethod()) 6701 continue; 6702 6703 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6704 break; 6705 } 6706 6707 return MissingPrototype; 6708} 6709 6710void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6711 // Don't complain if we're in GNU89 mode and the previous definition 6712 // was an extern inline function. 6713 const FunctionDecl *Definition; 6714 if (FD->isDefined(Definition) && 6715 !canRedefineFunction(Definition, getLangOptions())) { 6716 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6717 Definition->getStorageClass() == SC_Extern) 6718 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6719 << FD->getDeclName() << getLangOptions().CPlusPlus; 6720 else 6721 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6722 Diag(Definition->getLocation(), diag::note_previous_definition); 6723 } 6724} 6725 6726Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6727 // Clear the last template instantiation error context. 6728 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6729 6730 if (!D) 6731 return D; 6732 FunctionDecl *FD = 0; 6733 6734 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6735 FD = FunTmpl->getTemplatedDecl(); 6736 else 6737 FD = cast<FunctionDecl>(D); 6738 6739 // Enter a new function scope 6740 PushFunctionScope(); 6741 6742 // See if this is a redefinition. 6743 if (!FD->isLateTemplateParsed()) 6744 CheckForFunctionRedefinition(FD); 6745 6746 // Builtin functions cannot be defined. 6747 if (unsigned BuiltinID = FD->getBuiltinID()) { 6748 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6749 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6750 FD->setInvalidDecl(); 6751 } 6752 } 6753 6754 // The return type of a function definition must be complete 6755 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6756 QualType ResultType = FD->getResultType(); 6757 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6758 !FD->isInvalidDecl() && 6759 RequireCompleteType(FD->getLocation(), ResultType, 6760 diag::err_func_def_incomplete_result)) 6761 FD->setInvalidDecl(); 6762 6763 // GNU warning -Wmissing-prototypes: 6764 // Warn if a global function is defined without a previous 6765 // prototype declaration. This warning is issued even if the 6766 // definition itself provides a prototype. The aim is to detect 6767 // global functions that fail to be declared in header files. 6768 if (ShouldWarnAboutMissingPrototype(FD)) 6769 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6770 6771 if (FnBodyScope) 6772 PushDeclContext(FnBodyScope, FD); 6773 6774 // Check the validity of our function parameters 6775 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6776 /*CheckParameterNames=*/true); 6777 6778 // Introduce our parameters into the function scope 6779 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6780 ParmVarDecl *Param = FD->getParamDecl(p); 6781 Param->setOwningFunction(FD); 6782 6783 // If this has an identifier, add it to the scope stack. 6784 if (Param->getIdentifier() && FnBodyScope) { 6785 CheckShadow(FnBodyScope, Param); 6786 6787 PushOnScopeChains(Param, FnBodyScope); 6788 } 6789 } 6790 6791 // Checking attributes of current function definition 6792 // dllimport attribute. 6793 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6794 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6795 // dllimport attribute cannot be directly applied to definition. 6796 // Microsoft accepts dllimport for functions defined within class scope. 6797 if (!DA->isInherited() && 6798 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 6799 Diag(FD->getLocation(), 6800 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6801 << "dllimport"; 6802 FD->setInvalidDecl(); 6803 return FD; 6804 } 6805 6806 // Visual C++ appears to not think this is an issue, so only issue 6807 // a warning when Microsoft extensions are disabled. 6808 if (!LangOpts.MicrosoftExt) { 6809 // If a symbol previously declared dllimport is later defined, the 6810 // attribute is ignored in subsequent references, and a warning is 6811 // emitted. 6812 Diag(FD->getLocation(), 6813 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6814 << FD->getName() << "dllimport"; 6815 } 6816 } 6817 return FD; 6818} 6819 6820/// \brief Given the set of return statements within a function body, 6821/// compute the variables that are subject to the named return value 6822/// optimization. 6823/// 6824/// Each of the variables that is subject to the named return value 6825/// optimization will be marked as NRVO variables in the AST, and any 6826/// return statement that has a marked NRVO variable as its NRVO candidate can 6827/// use the named return value optimization. 6828/// 6829/// This function applies a very simplistic algorithm for NRVO: if every return 6830/// statement in the function has the same NRVO candidate, that candidate is 6831/// the NRVO variable. 6832/// 6833/// FIXME: Employ a smarter algorithm that accounts for multiple return 6834/// statements and the lifetimes of the NRVO candidates. We should be able to 6835/// find a maximal set of NRVO variables. 6836void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6837 ReturnStmt **Returns = Scope->Returns.data(); 6838 6839 const VarDecl *NRVOCandidate = 0; 6840 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6841 if (!Returns[I]->getNRVOCandidate()) 6842 return; 6843 6844 if (!NRVOCandidate) 6845 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6846 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6847 return; 6848 } 6849 6850 if (NRVOCandidate) 6851 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6852} 6853 6854Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6855 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6856} 6857 6858Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6859 bool IsInstantiation) { 6860 FunctionDecl *FD = 0; 6861 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6862 if (FunTmpl) 6863 FD = FunTmpl->getTemplatedDecl(); 6864 else 6865 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6866 6867 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6868 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6869 6870 if (FD) { 6871 FD->setBody(Body); 6872 if (FD->isMain()) { 6873 // C and C++ allow for main to automagically return 0. 6874 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6875 FD->setHasImplicitReturnZero(true); 6876 WP.disableCheckFallThrough(); 6877 } else if (FD->hasAttr<NakedAttr>()) { 6878 // If the function is marked 'naked', don't complain about missing return 6879 // statements. 6880 WP.disableCheckFallThrough(); 6881 } 6882 6883 // MSVC permits the use of pure specifier (=0) on function definition, 6884 // defined at class scope, warn about this non standard construct. 6885 if (getLangOptions().MicrosoftExt && FD->isPure()) 6886 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6887 6888 if (!FD->isInvalidDecl()) { 6889 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6890 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6891 FD->getResultType(), FD); 6892 6893 // If this is a constructor, we need a vtable. 6894 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6895 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6896 6897 computeNRVO(Body, getCurFunction()); 6898 } 6899 6900 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6901 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6902 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6903 MD->setBody(Body); 6904 if (Body) 6905 MD->setEndLoc(Body->getLocEnd()); 6906 if (!MD->isInvalidDecl()) { 6907 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6908 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6909 MD->getResultType(), MD); 6910 6911 if (Body) 6912 computeNRVO(Body, getCurFunction()); 6913 } 6914 if (ObjCShouldCallSuperDealloc) { 6915 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 6916 ObjCShouldCallSuperDealloc = false; 6917 } 6918 if (ObjCShouldCallSuperFinalize) { 6919 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 6920 ObjCShouldCallSuperFinalize = false; 6921 } 6922 } else { 6923 return 0; 6924 } 6925 6926 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 6927 "ObjC methods, which should have been handled in the block above."); 6928 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 6929 "ObjC methods, which should have been handled in the block above."); 6930 6931 // Verify and clean out per-function state. 6932 if (Body) { 6933 // C++ constructors that have function-try-blocks can't have return 6934 // statements in the handlers of that block. (C++ [except.handle]p14) 6935 // Verify this. 6936 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6937 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6938 6939 // Verify that gotos and switch cases don't jump into scopes illegally. 6940 if (getCurFunction()->NeedsScopeChecking() && 6941 !dcl->isInvalidDecl() && 6942 !hasAnyUnrecoverableErrorsInThisFunction()) 6943 DiagnoseInvalidJumps(Body); 6944 6945 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6946 if (!Destructor->getParent()->isDependentType()) 6947 CheckDestructor(Destructor); 6948 6949 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6950 Destructor->getParent()); 6951 } 6952 6953 // If any errors have occurred, clear out any temporaries that may have 6954 // been leftover. This ensures that these temporaries won't be picked up for 6955 // deletion in some later function. 6956 if (PP.getDiagnostics().hasErrorOccurred() || 6957 PP.getDiagnostics().getSuppressAllDiagnostics()) { 6958 ExprTemporaries.clear(); 6959 ExprNeedsCleanups = false; 6960 } else if (!isa<FunctionTemplateDecl>(dcl)) { 6961 // Since the body is valid, issue any analysis-based warnings that are 6962 // enabled. 6963 ActivePolicy = &WP; 6964 } 6965 6966 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6967 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 6968 } 6969 6970 if (!IsInstantiation) 6971 PopDeclContext(); 6972 6973 PopFunctionOrBlockScope(ActivePolicy, dcl); 6974 6975 // If any errors have occurred, clear out any temporaries that may have 6976 // been leftover. This ensures that these temporaries won't be picked up for 6977 // deletion in some later function. 6978 if (getDiagnostics().hasErrorOccurred()) { 6979 ExprTemporaries.clear(); 6980 ExprNeedsCleanups = false; 6981 } 6982 6983 return dcl; 6984} 6985 6986 6987/// When we finish delayed parsing of an attribute, we must attach it to the 6988/// relevant Decl. 6989void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 6990 ParsedAttributes &Attrs) { 6991 ProcessDeclAttributeList(S, D, Attrs.getList()); 6992} 6993 6994 6995/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6996/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6997NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6998 IdentifierInfo &II, Scope *S) { 6999 // Before we produce a declaration for an implicitly defined 7000 // function, see whether there was a locally-scoped declaration of 7001 // this name as a function or variable. If so, use that 7002 // (non-visible) declaration, and complain about it. 7003 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7004 = findLocallyScopedExternalDecl(&II); 7005 if (Pos != LocallyScopedExternalDecls.end()) { 7006 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7007 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7008 return Pos->second; 7009 } 7010 7011 // Extension in C99. Legal in C90, but warn about it. 7012 if (II.getName().startswith("__builtin_")) 7013 Diag(Loc, diag::warn_builtin_unknown) << &II; 7014 else if (getLangOptions().C99) 7015 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7016 else 7017 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7018 7019 // Set a Declarator for the implicit definition: int foo(); 7020 const char *Dummy; 7021 AttributeFactory attrFactory; 7022 DeclSpec DS(attrFactory); 7023 unsigned DiagID; 7024 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7025 (void)Error; // Silence warning. 7026 assert(!Error && "Error setting up implicit decl!"); 7027 Declarator D(DS, Declarator::BlockContext); 7028 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7029 0, 0, true, SourceLocation(), 7030 SourceLocation(), 7031 EST_None, SourceLocation(), 7032 0, 0, 0, 0, Loc, Loc, D), 7033 DS.getAttributes(), 7034 SourceLocation()); 7035 D.SetIdentifier(&II, Loc); 7036 7037 // Insert this function into translation-unit scope. 7038 7039 DeclContext *PrevDC = CurContext; 7040 CurContext = Context.getTranslationUnitDecl(); 7041 7042 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7043 FD->setImplicit(); 7044 7045 CurContext = PrevDC; 7046 7047 AddKnownFunctionAttributes(FD); 7048 7049 return FD; 7050} 7051 7052/// \brief Adds any function attributes that we know a priori based on 7053/// the declaration of this function. 7054/// 7055/// These attributes can apply both to implicitly-declared builtins 7056/// (like __builtin___printf_chk) or to library-declared functions 7057/// like NSLog or printf. 7058/// 7059/// We need to check for duplicate attributes both here and where user-written 7060/// attributes are applied to declarations. 7061void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7062 if (FD->isInvalidDecl()) 7063 return; 7064 7065 // If this is a built-in function, map its builtin attributes to 7066 // actual attributes. 7067 if (unsigned BuiltinID = FD->getBuiltinID()) { 7068 // Handle printf-formatting attributes. 7069 unsigned FormatIdx; 7070 bool HasVAListArg; 7071 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7072 if (!FD->getAttr<FormatAttr>()) 7073 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7074 "printf", FormatIdx+1, 7075 HasVAListArg ? 0 : FormatIdx+2)); 7076 } 7077 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7078 HasVAListArg)) { 7079 if (!FD->getAttr<FormatAttr>()) 7080 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7081 "scanf", FormatIdx+1, 7082 HasVAListArg ? 0 : FormatIdx+2)); 7083 } 7084 7085 // Mark const if we don't care about errno and that is the only 7086 // thing preventing the function from being const. This allows 7087 // IRgen to use LLVM intrinsics for such functions. 7088 if (!getLangOptions().MathErrno && 7089 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7090 if (!FD->getAttr<ConstAttr>()) 7091 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7092 } 7093 7094 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7095 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7096 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7097 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7098 } 7099 7100 IdentifierInfo *Name = FD->getIdentifier(); 7101 if (!Name) 7102 return; 7103 if ((!getLangOptions().CPlusPlus && 7104 FD->getDeclContext()->isTranslationUnit()) || 7105 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7106 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7107 LinkageSpecDecl::lang_c)) { 7108 // Okay: this could be a libc/libm/Objective-C function we know 7109 // about. 7110 } else 7111 return; 7112 7113 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7114 // FIXME: NSLog and NSLogv should be target specific 7115 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7116 // FIXME: We known better than our headers. 7117 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7118 } else 7119 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7120 "printf", 1, 7121 Name->isStr("NSLogv") ? 0 : 2)); 7122 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7123 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7124 // target-specific builtins, perhaps? 7125 if (!FD->getAttr<FormatAttr>()) 7126 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7127 "printf", 2, 7128 Name->isStr("vasprintf") ? 0 : 3)); 7129 } 7130} 7131 7132TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7133 TypeSourceInfo *TInfo) { 7134 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7135 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7136 7137 if (!TInfo) { 7138 assert(D.isInvalidType() && "no declarator info for valid type"); 7139 TInfo = Context.getTrivialTypeSourceInfo(T); 7140 } 7141 7142 // Scope manipulation handled by caller. 7143 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7144 D.getSourceRange().getBegin(), 7145 D.getIdentifierLoc(), 7146 D.getIdentifier(), 7147 TInfo); 7148 7149 // Bail out immediately if we have an invalid declaration. 7150 if (D.isInvalidType()) { 7151 NewTD->setInvalidDecl(); 7152 return NewTD; 7153 } 7154 7155 if (D.getDeclSpec().isModulePrivateSpecified()) { 7156 if (CurContext->isFunctionOrMethod()) 7157 Diag(NewTD->getLocation(), diag::err_module_private_local) 7158 << 2 << NewTD->getDeclName() 7159 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7160 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7161 else 7162 NewTD->setModulePrivate(); 7163 } 7164 7165 // C++ [dcl.typedef]p8: 7166 // If the typedef declaration defines an unnamed class (or 7167 // enum), the first typedef-name declared by the declaration 7168 // to be that class type (or enum type) is used to denote the 7169 // class type (or enum type) for linkage purposes only. 7170 // We need to check whether the type was declared in the declaration. 7171 switch (D.getDeclSpec().getTypeSpecType()) { 7172 case TST_enum: 7173 case TST_struct: 7174 case TST_union: 7175 case TST_class: { 7176 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7177 7178 // Do nothing if the tag is not anonymous or already has an 7179 // associated typedef (from an earlier typedef in this decl group). 7180 if (tagFromDeclSpec->getIdentifier()) break; 7181 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7182 7183 // A well-formed anonymous tag must always be a TUK_Definition. 7184 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7185 7186 // The type must match the tag exactly; no qualifiers allowed. 7187 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7188 break; 7189 7190 // Otherwise, set this is the anon-decl typedef for the tag. 7191 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7192 break; 7193 } 7194 7195 default: 7196 break; 7197 } 7198 7199 return NewTD; 7200} 7201 7202 7203/// \brief Determine whether a tag with a given kind is acceptable 7204/// as a redeclaration of the given tag declaration. 7205/// 7206/// \returns true if the new tag kind is acceptable, false otherwise. 7207bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7208 TagTypeKind NewTag, bool isDefinition, 7209 SourceLocation NewTagLoc, 7210 const IdentifierInfo &Name) { 7211 // C++ [dcl.type.elab]p3: 7212 // The class-key or enum keyword present in the 7213 // elaborated-type-specifier shall agree in kind with the 7214 // declaration to which the name in the elaborated-type-specifier 7215 // refers. This rule also applies to the form of 7216 // elaborated-type-specifier that declares a class-name or 7217 // friend class since it can be construed as referring to the 7218 // definition of the class. Thus, in any 7219 // elaborated-type-specifier, the enum keyword shall be used to 7220 // refer to an enumeration (7.2), the union class-key shall be 7221 // used to refer to a union (clause 9), and either the class or 7222 // struct class-key shall be used to refer to a class (clause 9) 7223 // declared using the class or struct class-key. 7224 TagTypeKind OldTag = Previous->getTagKind(); 7225 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7226 if (OldTag == NewTag) 7227 return true; 7228 7229 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7230 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7231 // Warn about the struct/class tag mismatch. 7232 bool isTemplate = false; 7233 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7234 isTemplate = Record->getDescribedClassTemplate(); 7235 7236 if (!ActiveTemplateInstantiations.empty()) { 7237 // In a template instantiation, do not offer fix-its for tag mismatches 7238 // since they usually mess up the template instead of fixing the problem. 7239 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7240 << (NewTag == TTK_Class) << isTemplate << &Name; 7241 return true; 7242 } 7243 7244 if (isDefinition) { 7245 // On definitions, check previous tags and issue a fix-it for each 7246 // one that doesn't match the current tag. 7247 if (Previous->getDefinition()) { 7248 // Don't suggest fix-its for redefinitions. 7249 return true; 7250 } 7251 7252 bool previousMismatch = false; 7253 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7254 E(Previous->redecls_end()); I != E; ++I) { 7255 if (I->getTagKind() != NewTag) { 7256 if (!previousMismatch) { 7257 previousMismatch = true; 7258 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7259 << (NewTag == TTK_Class) << isTemplate << &Name; 7260 } 7261 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7262 << (NewTag == TTK_Class) 7263 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7264 NewTag == TTK_Class? 7265 "class" : "struct"); 7266 } 7267 } 7268 return true; 7269 } 7270 7271 // Check for a previous definition. If current tag and definition 7272 // are same type, do nothing. If no definition, but disagree with 7273 // with previous tag type, give a warning, but no fix-it. 7274 const TagDecl *Redecl = Previous->getDefinition() ? 7275 Previous->getDefinition() : Previous; 7276 if (Redecl->getTagKind() == NewTag) { 7277 return true; 7278 } 7279 7280 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7281 << (NewTag == TTK_Class) 7282 << isTemplate << &Name; 7283 Diag(Redecl->getLocation(), diag::note_previous_use); 7284 7285 // If there is a previous defintion, suggest a fix-it. 7286 if (Previous->getDefinition()) { 7287 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7288 << (Redecl->getTagKind() == TTK_Class) 7289 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7290 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7291 } 7292 7293 return true; 7294 } 7295 return false; 7296} 7297 7298/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7299/// former case, Name will be non-null. In the later case, Name will be null. 7300/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7301/// reference/declaration/definition of a tag. 7302Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7303 SourceLocation KWLoc, CXXScopeSpec &SS, 7304 IdentifierInfo *Name, SourceLocation NameLoc, 7305 AttributeList *Attr, AccessSpecifier AS, 7306 SourceLocation ModulePrivateLoc, 7307 MultiTemplateParamsArg TemplateParameterLists, 7308 bool &OwnedDecl, bool &IsDependent, 7309 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7310 TypeResult UnderlyingType) { 7311 // If this is not a definition, it must have a name. 7312 assert((Name != 0 || TUK == TUK_Definition) && 7313 "Nameless record must be a definition!"); 7314 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7315 7316 OwnedDecl = false; 7317 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7318 7319 // FIXME: Check explicit specializations more carefully. 7320 bool isExplicitSpecialization = false; 7321 bool Invalid = false; 7322 7323 // We only need to do this matching if we have template parameters 7324 // or a scope specifier, which also conveniently avoids this work 7325 // for non-C++ cases. 7326 if (TemplateParameterLists.size() > 0 || 7327 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7328 if (TemplateParameterList *TemplateParams 7329 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7330 TemplateParameterLists.get(), 7331 TemplateParameterLists.size(), 7332 TUK == TUK_Friend, 7333 isExplicitSpecialization, 7334 Invalid)) { 7335 if (TemplateParams->size() > 0) { 7336 // This is a declaration or definition of a class template (which may 7337 // be a member of another template). 7338 7339 if (Invalid) 7340 return 0; 7341 7342 OwnedDecl = false; 7343 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7344 SS, Name, NameLoc, Attr, 7345 TemplateParams, AS, 7346 ModulePrivateLoc, 7347 TemplateParameterLists.size() - 1, 7348 (TemplateParameterList**) TemplateParameterLists.release()); 7349 return Result.get(); 7350 } else { 7351 // The "template<>" header is extraneous. 7352 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7353 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7354 isExplicitSpecialization = true; 7355 } 7356 } 7357 } 7358 7359 // Figure out the underlying type if this a enum declaration. We need to do 7360 // this early, because it's needed to detect if this is an incompatible 7361 // redeclaration. 7362 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7363 7364 if (Kind == TTK_Enum) { 7365 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7366 // No underlying type explicitly specified, or we failed to parse the 7367 // type, default to int. 7368 EnumUnderlying = Context.IntTy.getTypePtr(); 7369 else if (UnderlyingType.get()) { 7370 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7371 // integral type; any cv-qualification is ignored. 7372 TypeSourceInfo *TI = 0; 7373 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7374 EnumUnderlying = TI; 7375 7376 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7377 7378 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7379 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7380 << T; 7381 // Recover by falling back to int. 7382 EnumUnderlying = Context.IntTy.getTypePtr(); 7383 } 7384 7385 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7386 UPPC_FixedUnderlyingType)) 7387 EnumUnderlying = Context.IntTy.getTypePtr(); 7388 7389 } else if (getLangOptions().MicrosoftExt) 7390 // Microsoft enums are always of int type. 7391 EnumUnderlying = Context.IntTy.getTypePtr(); 7392 } 7393 7394 DeclContext *SearchDC = CurContext; 7395 DeclContext *DC = CurContext; 7396 bool isStdBadAlloc = false; 7397 7398 RedeclarationKind Redecl = ForRedeclaration; 7399 if (TUK == TUK_Friend || TUK == TUK_Reference) 7400 Redecl = NotForRedeclaration; 7401 7402 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7403 7404 if (Name && SS.isNotEmpty()) { 7405 // We have a nested-name tag ('struct foo::bar'). 7406 7407 // Check for invalid 'foo::'. 7408 if (SS.isInvalid()) { 7409 Name = 0; 7410 goto CreateNewDecl; 7411 } 7412 7413 // If this is a friend or a reference to a class in a dependent 7414 // context, don't try to make a decl for it. 7415 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7416 DC = computeDeclContext(SS, false); 7417 if (!DC) { 7418 IsDependent = true; 7419 return 0; 7420 } 7421 } else { 7422 DC = computeDeclContext(SS, true); 7423 if (!DC) { 7424 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7425 << SS.getRange(); 7426 return 0; 7427 } 7428 } 7429 7430 if (RequireCompleteDeclContext(SS, DC)) 7431 return 0; 7432 7433 SearchDC = DC; 7434 // Look-up name inside 'foo::'. 7435 LookupQualifiedName(Previous, DC); 7436 7437 if (Previous.isAmbiguous()) 7438 return 0; 7439 7440 if (Previous.empty()) { 7441 // Name lookup did not find anything. However, if the 7442 // nested-name-specifier refers to the current instantiation, 7443 // and that current instantiation has any dependent base 7444 // classes, we might find something at instantiation time: treat 7445 // this as a dependent elaborated-type-specifier. 7446 // But this only makes any sense for reference-like lookups. 7447 if (Previous.wasNotFoundInCurrentInstantiation() && 7448 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7449 IsDependent = true; 7450 return 0; 7451 } 7452 7453 // A tag 'foo::bar' must already exist. 7454 Diag(NameLoc, diag::err_not_tag_in_scope) 7455 << Kind << Name << DC << SS.getRange(); 7456 Name = 0; 7457 Invalid = true; 7458 goto CreateNewDecl; 7459 } 7460 } else if (Name) { 7461 // If this is a named struct, check to see if there was a previous forward 7462 // declaration or definition. 7463 // FIXME: We're looking into outer scopes here, even when we 7464 // shouldn't be. Doing so can result in ambiguities that we 7465 // shouldn't be diagnosing. 7466 LookupName(Previous, S); 7467 7468 if (Previous.isAmbiguous() && 7469 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7470 LookupResult::Filter F = Previous.makeFilter(); 7471 while (F.hasNext()) { 7472 NamedDecl *ND = F.next(); 7473 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7474 F.erase(); 7475 } 7476 F.done(); 7477 } 7478 7479 // Note: there used to be some attempt at recovery here. 7480 if (Previous.isAmbiguous()) 7481 return 0; 7482 7483 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7484 // FIXME: This makes sure that we ignore the contexts associated 7485 // with C structs, unions, and enums when looking for a matching 7486 // tag declaration or definition. See the similar lookup tweak 7487 // in Sema::LookupName; is there a better way to deal with this? 7488 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7489 SearchDC = SearchDC->getParent(); 7490 } 7491 } else if (S->isFunctionPrototypeScope()) { 7492 // If this is an enum declaration in function prototype scope, set its 7493 // initial context to the translation unit. 7494 SearchDC = Context.getTranslationUnitDecl(); 7495 } 7496 7497 if (Previous.isSingleResult() && 7498 Previous.getFoundDecl()->isTemplateParameter()) { 7499 // Maybe we will complain about the shadowed template parameter. 7500 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7501 // Just pretend that we didn't see the previous declaration. 7502 Previous.clear(); 7503 } 7504 7505 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7506 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7507 // This is a declaration of or a reference to "std::bad_alloc". 7508 isStdBadAlloc = true; 7509 7510 if (Previous.empty() && StdBadAlloc) { 7511 // std::bad_alloc has been implicitly declared (but made invisible to 7512 // name lookup). Fill in this implicit declaration as the previous 7513 // declaration, so that the declarations get chained appropriately. 7514 Previous.addDecl(getStdBadAlloc()); 7515 } 7516 } 7517 7518 // If we didn't find a previous declaration, and this is a reference 7519 // (or friend reference), move to the correct scope. In C++, we 7520 // also need to do a redeclaration lookup there, just in case 7521 // there's a shadow friend decl. 7522 if (Name && Previous.empty() && 7523 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7524 if (Invalid) goto CreateNewDecl; 7525 assert(SS.isEmpty()); 7526 7527 if (TUK == TUK_Reference) { 7528 // C++ [basic.scope.pdecl]p5: 7529 // -- for an elaborated-type-specifier of the form 7530 // 7531 // class-key identifier 7532 // 7533 // if the elaborated-type-specifier is used in the 7534 // decl-specifier-seq or parameter-declaration-clause of a 7535 // function defined in namespace scope, the identifier is 7536 // declared as a class-name in the namespace that contains 7537 // the declaration; otherwise, except as a friend 7538 // declaration, the identifier is declared in the smallest 7539 // non-class, non-function-prototype scope that contains the 7540 // declaration. 7541 // 7542 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7543 // C structs and unions. 7544 // 7545 // It is an error in C++ to declare (rather than define) an enum 7546 // type, including via an elaborated type specifier. We'll 7547 // diagnose that later; for now, declare the enum in the same 7548 // scope as we would have picked for any other tag type. 7549 // 7550 // GNU C also supports this behavior as part of its incomplete 7551 // enum types extension, while GNU C++ does not. 7552 // 7553 // Find the context where we'll be declaring the tag. 7554 // FIXME: We would like to maintain the current DeclContext as the 7555 // lexical context, 7556 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7557 SearchDC = SearchDC->getParent(); 7558 7559 // Find the scope where we'll be declaring the tag. 7560 while (S->isClassScope() || 7561 (getLangOptions().CPlusPlus && 7562 S->isFunctionPrototypeScope()) || 7563 ((S->getFlags() & Scope::DeclScope) == 0) || 7564 (S->getEntity() && 7565 ((DeclContext *)S->getEntity())->isTransparentContext())) 7566 S = S->getParent(); 7567 } else { 7568 assert(TUK == TUK_Friend); 7569 // C++ [namespace.memdef]p3: 7570 // If a friend declaration in a non-local class first declares a 7571 // class or function, the friend class or function is a member of 7572 // the innermost enclosing namespace. 7573 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7574 } 7575 7576 // In C++, we need to do a redeclaration lookup to properly 7577 // diagnose some problems. 7578 if (getLangOptions().CPlusPlus) { 7579 Previous.setRedeclarationKind(ForRedeclaration); 7580 LookupQualifiedName(Previous, SearchDC); 7581 } 7582 } 7583 7584 if (!Previous.empty()) { 7585 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7586 7587 // It's okay to have a tag decl in the same scope as a typedef 7588 // which hides a tag decl in the same scope. Finding this 7589 // insanity with a redeclaration lookup can only actually happen 7590 // in C++. 7591 // 7592 // This is also okay for elaborated-type-specifiers, which is 7593 // technically forbidden by the current standard but which is 7594 // okay according to the likely resolution of an open issue; 7595 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7596 if (getLangOptions().CPlusPlus) { 7597 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7598 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7599 TagDecl *Tag = TT->getDecl(); 7600 if (Tag->getDeclName() == Name && 7601 Tag->getDeclContext()->getRedeclContext() 7602 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7603 PrevDecl = Tag; 7604 Previous.clear(); 7605 Previous.addDecl(Tag); 7606 Previous.resolveKind(); 7607 } 7608 } 7609 } 7610 } 7611 7612 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7613 // If this is a use of a previous tag, or if the tag is already declared 7614 // in the same scope (so that the definition/declaration completes or 7615 // rementions the tag), reuse the decl. 7616 if (TUK == TUK_Reference || TUK == TUK_Friend || 7617 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7618 // Make sure that this wasn't declared as an enum and now used as a 7619 // struct or something similar. 7620 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7621 TUK == TUK_Definition, KWLoc, 7622 *Name)) { 7623 bool SafeToContinue 7624 = (PrevTagDecl->getTagKind() != TTK_Enum && 7625 Kind != TTK_Enum); 7626 if (SafeToContinue) 7627 Diag(KWLoc, diag::err_use_with_wrong_tag) 7628 << Name 7629 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7630 PrevTagDecl->getKindName()); 7631 else 7632 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7633 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7634 7635 if (SafeToContinue) 7636 Kind = PrevTagDecl->getTagKind(); 7637 else { 7638 // Recover by making this an anonymous redefinition. 7639 Name = 0; 7640 Previous.clear(); 7641 Invalid = true; 7642 } 7643 } 7644 7645 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7646 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7647 7648 // All conflicts with previous declarations are recovered by 7649 // returning the previous declaration. 7650 if (ScopedEnum != PrevEnum->isScoped()) { 7651 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7652 << PrevEnum->isScoped(); 7653 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7654 return PrevTagDecl; 7655 } 7656 else if (EnumUnderlying && PrevEnum->isFixed()) { 7657 QualType T; 7658 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7659 T = TI->getType(); 7660 else 7661 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7662 7663 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7664 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7665 diag::err_enum_redeclare_type_mismatch) 7666 << T 7667 << PrevEnum->getIntegerType(); 7668 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7669 return PrevTagDecl; 7670 } 7671 } 7672 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7673 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7674 << PrevEnum->isFixed(); 7675 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7676 return PrevTagDecl; 7677 } 7678 } 7679 7680 if (!Invalid) { 7681 // If this is a use, just return the declaration we found. 7682 7683 // FIXME: In the future, return a variant or some other clue 7684 // for the consumer of this Decl to know it doesn't own it. 7685 // For our current ASTs this shouldn't be a problem, but will 7686 // need to be changed with DeclGroups. 7687 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7688 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7689 return PrevTagDecl; 7690 7691 // Diagnose attempts to redefine a tag. 7692 if (TUK == TUK_Definition) { 7693 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7694 // If we're defining a specialization and the previous definition 7695 // is from an implicit instantiation, don't emit an error 7696 // here; we'll catch this in the general case below. 7697 if (!isExplicitSpecialization || 7698 !isa<CXXRecordDecl>(Def) || 7699 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7700 == TSK_ExplicitSpecialization) { 7701 Diag(NameLoc, diag::err_redefinition) << Name; 7702 Diag(Def->getLocation(), diag::note_previous_definition); 7703 // If this is a redefinition, recover by making this 7704 // struct be anonymous, which will make any later 7705 // references get the previous definition. 7706 Name = 0; 7707 Previous.clear(); 7708 Invalid = true; 7709 } 7710 } else { 7711 // If the type is currently being defined, complain 7712 // about a nested redefinition. 7713 const TagType *Tag 7714 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7715 if (Tag->isBeingDefined()) { 7716 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7717 Diag(PrevTagDecl->getLocation(), 7718 diag::note_previous_definition); 7719 Name = 0; 7720 Previous.clear(); 7721 Invalid = true; 7722 } 7723 } 7724 7725 // Okay, this is definition of a previously declared or referenced 7726 // tag PrevDecl. We're going to create a new Decl for it. 7727 } 7728 } 7729 // If we get here we have (another) forward declaration or we 7730 // have a definition. Just create a new decl. 7731 7732 } else { 7733 // If we get here, this is a definition of a new tag type in a nested 7734 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7735 // new decl/type. We set PrevDecl to NULL so that the entities 7736 // have distinct types. 7737 Previous.clear(); 7738 } 7739 // If we get here, we're going to create a new Decl. If PrevDecl 7740 // is non-NULL, it's a definition of the tag declared by 7741 // PrevDecl. If it's NULL, we have a new definition. 7742 7743 7744 // Otherwise, PrevDecl is not a tag, but was found with tag 7745 // lookup. This is only actually possible in C++, where a few 7746 // things like templates still live in the tag namespace. 7747 } else { 7748 assert(getLangOptions().CPlusPlus); 7749 7750 // Use a better diagnostic if an elaborated-type-specifier 7751 // found the wrong kind of type on the first 7752 // (non-redeclaration) lookup. 7753 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7754 !Previous.isForRedeclaration()) { 7755 unsigned Kind = 0; 7756 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7757 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7758 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7759 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7760 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7761 Invalid = true; 7762 7763 // Otherwise, only diagnose if the declaration is in scope. 7764 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7765 isExplicitSpecialization)) { 7766 // do nothing 7767 7768 // Diagnose implicit declarations introduced by elaborated types. 7769 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7770 unsigned Kind = 0; 7771 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7772 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7773 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7774 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7775 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7776 Invalid = true; 7777 7778 // Otherwise it's a declaration. Call out a particularly common 7779 // case here. 7780 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7781 unsigned Kind = 0; 7782 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7783 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7784 << Name << Kind << TND->getUnderlyingType(); 7785 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7786 Invalid = true; 7787 7788 // Otherwise, diagnose. 7789 } else { 7790 // The tag name clashes with something else in the target scope, 7791 // issue an error and recover by making this tag be anonymous. 7792 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7793 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7794 Name = 0; 7795 Invalid = true; 7796 } 7797 7798 // The existing declaration isn't relevant to us; we're in a 7799 // new scope, so clear out the previous declaration. 7800 Previous.clear(); 7801 } 7802 } 7803 7804CreateNewDecl: 7805 7806 TagDecl *PrevDecl = 0; 7807 if (Previous.isSingleResult()) 7808 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7809 7810 // If there is an identifier, use the location of the identifier as the 7811 // location of the decl, otherwise use the location of the struct/union 7812 // keyword. 7813 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7814 7815 // Otherwise, create a new declaration. If there is a previous 7816 // declaration of the same entity, the two will be linked via 7817 // PrevDecl. 7818 TagDecl *New; 7819 7820 bool IsForwardReference = false; 7821 if (Kind == TTK_Enum) { 7822 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7823 // enum X { A, B, C } D; D should chain to X. 7824 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7825 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7826 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7827 // If this is an undefined enum, warn. 7828 if (TUK != TUK_Definition && !Invalid) { 7829 TagDecl *Def; 7830 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7831 // C++0x: 7.2p2: opaque-enum-declaration. 7832 // Conflicts are diagnosed above. Do nothing. 7833 } 7834 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7835 Diag(Loc, diag::ext_forward_ref_enum_def) 7836 << New; 7837 Diag(Def->getLocation(), diag::note_previous_definition); 7838 } else { 7839 unsigned DiagID = diag::ext_forward_ref_enum; 7840 if (getLangOptions().MicrosoftExt) 7841 DiagID = diag::ext_ms_forward_ref_enum; 7842 else if (getLangOptions().CPlusPlus) 7843 DiagID = diag::err_forward_ref_enum; 7844 Diag(Loc, DiagID); 7845 7846 // If this is a forward-declared reference to an enumeration, make a 7847 // note of it; we won't actually be introducing the declaration into 7848 // the declaration context. 7849 if (TUK == TUK_Reference) 7850 IsForwardReference = true; 7851 } 7852 } 7853 7854 if (EnumUnderlying) { 7855 EnumDecl *ED = cast<EnumDecl>(New); 7856 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7857 ED->setIntegerTypeSourceInfo(TI); 7858 else 7859 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7860 ED->setPromotionType(ED->getIntegerType()); 7861 } 7862 7863 } else { 7864 // struct/union/class 7865 7866 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7867 // struct X { int A; } D; D should chain to X. 7868 if (getLangOptions().CPlusPlus) { 7869 // FIXME: Look for a way to use RecordDecl for simple structs. 7870 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7871 cast_or_null<CXXRecordDecl>(PrevDecl)); 7872 7873 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7874 StdBadAlloc = cast<CXXRecordDecl>(New); 7875 } else 7876 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7877 cast_or_null<RecordDecl>(PrevDecl)); 7878 } 7879 7880 // Maybe add qualifier info. 7881 if (SS.isNotEmpty()) { 7882 if (SS.isSet()) { 7883 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7884 if (TemplateParameterLists.size() > 0) { 7885 New->setTemplateParameterListsInfo(Context, 7886 TemplateParameterLists.size(), 7887 (TemplateParameterList**) TemplateParameterLists.release()); 7888 } 7889 } 7890 else 7891 Invalid = true; 7892 } 7893 7894 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7895 // Add alignment attributes if necessary; these attributes are checked when 7896 // the ASTContext lays out the structure. 7897 // 7898 // It is important for implementing the correct semantics that this 7899 // happen here (in act on tag decl). The #pragma pack stack is 7900 // maintained as a result of parser callbacks which can occur at 7901 // many points during the parsing of a struct declaration (because 7902 // the #pragma tokens are effectively skipped over during the 7903 // parsing of the struct). 7904 AddAlignmentAttributesForRecord(RD); 7905 7906 AddMsStructLayoutForRecord(RD); 7907 } 7908 7909 if (PrevDecl && PrevDecl->isModulePrivate()) 7910 New->setModulePrivate(); 7911 else if (ModulePrivateLoc.isValid()) { 7912 if (isExplicitSpecialization) 7913 Diag(New->getLocation(), diag::err_module_private_specialization) 7914 << 2 7915 << FixItHint::CreateRemoval(ModulePrivateLoc); 7916 else if (PrevDecl && !PrevDecl->isModulePrivate()) 7917 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 7918 // __module_private__ does not apply to local classes. However, we only 7919 // diagnose this as an error when the declaration specifiers are 7920 // freestanding. Here, we just ignore the __module_private__. 7921 // foobar 7922 else if (!SearchDC->isFunctionOrMethod()) 7923 New->setModulePrivate(); 7924 } 7925 7926 // If this is a specialization of a member class (of a class template), 7927 // check the specialization. 7928 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7929 Invalid = true; 7930 7931 if (Invalid) 7932 New->setInvalidDecl(); 7933 7934 if (Attr) 7935 ProcessDeclAttributeList(S, New, Attr); 7936 7937 // If we're declaring or defining a tag in function prototype scope 7938 // in C, note that this type can only be used within the function. 7939 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7940 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7941 7942 // Set the lexical context. If the tag has a C++ scope specifier, the 7943 // lexical context will be different from the semantic context. 7944 New->setLexicalDeclContext(CurContext); 7945 7946 // Mark this as a friend decl if applicable. 7947 // In Microsoft mode, a friend declaration also acts as a forward 7948 // declaration so we always pass true to setObjectOfFriendDecl to make 7949 // the tag name visible. 7950 if (TUK == TUK_Friend) 7951 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 7952 getLangOptions().MicrosoftExt); 7953 7954 // Set the access specifier. 7955 if (!Invalid && SearchDC->isRecord()) 7956 SetMemberAccessSpecifier(New, PrevDecl, AS); 7957 7958 if (TUK == TUK_Definition) 7959 New->startDefinition(); 7960 7961 // If this has an identifier, add it to the scope stack. 7962 if (TUK == TUK_Friend) { 7963 // We might be replacing an existing declaration in the lookup tables; 7964 // if so, borrow its access specifier. 7965 if (PrevDecl) 7966 New->setAccess(PrevDecl->getAccess()); 7967 7968 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7969 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7970 if (Name) // can be null along some error paths 7971 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7972 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7973 } else if (Name) { 7974 S = getNonFieldDeclScope(S); 7975 PushOnScopeChains(New, S, !IsForwardReference); 7976 if (IsForwardReference) 7977 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7978 7979 } else { 7980 CurContext->addDecl(New); 7981 } 7982 7983 // If this is the C FILE type, notify the AST context. 7984 if (IdentifierInfo *II = New->getIdentifier()) 7985 if (!New->isInvalidDecl() && 7986 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7987 II->isStr("FILE")) 7988 Context.setFILEDecl(New); 7989 7990 OwnedDecl = true; 7991 return New; 7992} 7993 7994void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7995 AdjustDeclIfTemplate(TagD); 7996 TagDecl *Tag = cast<TagDecl>(TagD); 7997 7998 // Enter the tag context. 7999 PushDeclContext(S, Tag); 8000} 8001 8002void Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8003 assert(isa<ObjCContainerDecl>(IDecl) && 8004 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8005 DeclContext *OCD = cast<DeclContext>(IDecl); 8006 assert(getContainingDC(OCD) == CurContext && 8007 "The next DeclContext should be lexically contained in the current one."); 8008 CurContext = OCD; 8009} 8010 8011void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8012 SourceLocation FinalLoc, 8013 SourceLocation LBraceLoc) { 8014 AdjustDeclIfTemplate(TagD); 8015 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8016 8017 FieldCollector->StartClass(); 8018 8019 if (!Record->getIdentifier()) 8020 return; 8021 8022 if (FinalLoc.isValid()) 8023 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8024 8025 // C++ [class]p2: 8026 // [...] The class-name is also inserted into the scope of the 8027 // class itself; this is known as the injected-class-name. For 8028 // purposes of access checking, the injected-class-name is treated 8029 // as if it were a public member name. 8030 CXXRecordDecl *InjectedClassName 8031 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8032 Record->getLocStart(), Record->getLocation(), 8033 Record->getIdentifier(), 8034 /*PrevDecl=*/0, 8035 /*DelayTypeCreation=*/true); 8036 Context.getTypeDeclType(InjectedClassName, Record); 8037 InjectedClassName->setImplicit(); 8038 InjectedClassName->setAccess(AS_public); 8039 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8040 InjectedClassName->setDescribedClassTemplate(Template); 8041 PushOnScopeChains(InjectedClassName, S); 8042 assert(InjectedClassName->isInjectedClassName() && 8043 "Broken injected-class-name"); 8044} 8045 8046void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8047 SourceLocation RBraceLoc) { 8048 AdjustDeclIfTemplate(TagD); 8049 TagDecl *Tag = cast<TagDecl>(TagD); 8050 Tag->setRBraceLoc(RBraceLoc); 8051 8052 if (isa<CXXRecordDecl>(Tag)) 8053 FieldCollector->FinishClass(); 8054 8055 // Exit this scope of this tag's definition. 8056 PopDeclContext(); 8057 8058 // Notify the consumer that we've defined a tag. 8059 Consumer.HandleTagDeclDefinition(Tag); 8060} 8061 8062void Sema::ActOnObjCContainerFinishDefinition() { 8063 // Exit this scope of this interface definition. 8064 PopDeclContext(); 8065} 8066 8067void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8068 AdjustDeclIfTemplate(TagD); 8069 TagDecl *Tag = cast<TagDecl>(TagD); 8070 Tag->setInvalidDecl(); 8071 8072 // We're undoing ActOnTagStartDefinition here, not 8073 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8074 // the FieldCollector. 8075 8076 PopDeclContext(); 8077} 8078 8079// Note that FieldName may be null for anonymous bitfields. 8080bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8081 QualType FieldTy, const Expr *BitWidth, 8082 bool *ZeroWidth) { 8083 // Default to true; that shouldn't confuse checks for emptiness 8084 if (ZeroWidth) 8085 *ZeroWidth = true; 8086 8087 // C99 6.7.2.1p4 - verify the field type. 8088 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8089 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8090 // Handle incomplete types with specific error. 8091 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8092 return true; 8093 if (FieldName) 8094 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8095 << FieldName << FieldTy << BitWidth->getSourceRange(); 8096 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8097 << FieldTy << BitWidth->getSourceRange(); 8098 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8099 UPPC_BitFieldWidth)) 8100 return true; 8101 8102 // If the bit-width is type- or value-dependent, don't try to check 8103 // it now. 8104 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8105 return false; 8106 8107 llvm::APSInt Value; 8108 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8109 return true; 8110 8111 if (Value != 0 && ZeroWidth) 8112 *ZeroWidth = false; 8113 8114 // Zero-width bitfield is ok for anonymous field. 8115 if (Value == 0 && FieldName) 8116 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8117 8118 if (Value.isSigned() && Value.isNegative()) { 8119 if (FieldName) 8120 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8121 << FieldName << Value.toString(10); 8122 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8123 << Value.toString(10); 8124 } 8125 8126 if (!FieldTy->isDependentType()) { 8127 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8128 if (Value.getZExtValue() > TypeSize) { 8129 if (!getLangOptions().CPlusPlus) { 8130 if (FieldName) 8131 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8132 << FieldName << (unsigned)Value.getZExtValue() 8133 << (unsigned)TypeSize; 8134 8135 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8136 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8137 } 8138 8139 if (FieldName) 8140 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8141 << FieldName << (unsigned)Value.getZExtValue() 8142 << (unsigned)TypeSize; 8143 else 8144 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8145 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8146 } 8147 } 8148 8149 return false; 8150} 8151 8152/// ActOnField - Each field of a C struct/union is passed into this in order 8153/// to create a FieldDecl object for it. 8154Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8155 Declarator &D, Expr *BitfieldWidth) { 8156 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8157 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8158 /*HasInit=*/false, AS_public); 8159 return Res; 8160} 8161 8162/// HandleField - Analyze a field of a C struct or a C++ data member. 8163/// 8164FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8165 SourceLocation DeclStart, 8166 Declarator &D, Expr *BitWidth, bool HasInit, 8167 AccessSpecifier AS) { 8168 IdentifierInfo *II = D.getIdentifier(); 8169 SourceLocation Loc = DeclStart; 8170 if (II) Loc = D.getIdentifierLoc(); 8171 8172 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8173 QualType T = TInfo->getType(); 8174 if (getLangOptions().CPlusPlus) { 8175 CheckExtraCXXDefaultArguments(D); 8176 8177 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8178 UPPC_DataMemberType)) { 8179 D.setInvalidType(); 8180 T = Context.IntTy; 8181 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8182 } 8183 } 8184 8185 DiagnoseFunctionSpecifiers(D); 8186 8187 if (D.getDeclSpec().isThreadSpecified()) 8188 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8189 if (D.getDeclSpec().isConstexprSpecified()) 8190 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8191 << 2; 8192 8193 // Check to see if this name was declared as a member previously 8194 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8195 LookupName(Previous, S); 8196 assert((Previous.empty() || Previous.isOverloadedResult() || 8197 Previous.isSingleResult()) 8198 && "Lookup of member name should be either overloaded, single or null"); 8199 8200 // If the name is overloaded then get any declaration else get the single result 8201 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 8202 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 8203 8204 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8205 // Maybe we will complain about the shadowed template parameter. 8206 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8207 // Just pretend that we didn't see the previous declaration. 8208 PrevDecl = 0; 8209 } 8210 8211 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8212 PrevDecl = 0; 8213 8214 bool Mutable 8215 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8216 SourceLocation TSSL = D.getSourceRange().getBegin(); 8217 FieldDecl *NewFD 8218 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8219 TSSL, AS, PrevDecl, &D); 8220 8221 if (NewFD->isInvalidDecl()) 8222 Record->setInvalidDecl(); 8223 8224 if (D.getDeclSpec().isModulePrivateSpecified()) 8225 NewFD->setModulePrivate(); 8226 8227 if (NewFD->isInvalidDecl() && PrevDecl) { 8228 // Don't introduce NewFD into scope; there's already something 8229 // with the same name in the same scope. 8230 } else if (II) { 8231 PushOnScopeChains(NewFD, S); 8232 } else 8233 Record->addDecl(NewFD); 8234 8235 return NewFD; 8236} 8237 8238/// \brief Build a new FieldDecl and check its well-formedness. 8239/// 8240/// This routine builds a new FieldDecl given the fields name, type, 8241/// record, etc. \p PrevDecl should refer to any previous declaration 8242/// with the same name and in the same scope as the field to be 8243/// created. 8244/// 8245/// \returns a new FieldDecl. 8246/// 8247/// \todo The Declarator argument is a hack. It will be removed once 8248FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8249 TypeSourceInfo *TInfo, 8250 RecordDecl *Record, SourceLocation Loc, 8251 bool Mutable, Expr *BitWidth, bool HasInit, 8252 SourceLocation TSSL, 8253 AccessSpecifier AS, NamedDecl *PrevDecl, 8254 Declarator *D) { 8255 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8256 bool InvalidDecl = false; 8257 if (D) InvalidDecl = D->isInvalidType(); 8258 8259 // If we receive a broken type, recover by assuming 'int' and 8260 // marking this declaration as invalid. 8261 if (T.isNull()) { 8262 InvalidDecl = true; 8263 T = Context.IntTy; 8264 } 8265 8266 QualType EltTy = Context.getBaseElementType(T); 8267 if (!EltTy->isDependentType() && 8268 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8269 // Fields of incomplete type force their record to be invalid. 8270 Record->setInvalidDecl(); 8271 InvalidDecl = true; 8272 } 8273 8274 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8275 // than a variably modified type. 8276 if (!InvalidDecl && T->isVariablyModifiedType()) { 8277 bool SizeIsNegative; 8278 llvm::APSInt Oversized; 8279 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8280 SizeIsNegative, 8281 Oversized); 8282 if (!FixedTy.isNull()) { 8283 Diag(Loc, diag::warn_illegal_constant_array_size); 8284 T = FixedTy; 8285 } else { 8286 if (SizeIsNegative) 8287 Diag(Loc, diag::err_typecheck_negative_array_size); 8288 else if (Oversized.getBoolValue()) 8289 Diag(Loc, diag::err_array_too_large) 8290 << Oversized.toString(10); 8291 else 8292 Diag(Loc, diag::err_typecheck_field_variable_size); 8293 InvalidDecl = true; 8294 } 8295 } 8296 8297 // Fields can not have abstract class types 8298 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8299 diag::err_abstract_type_in_decl, 8300 AbstractFieldType)) 8301 InvalidDecl = true; 8302 8303 bool ZeroWidth = false; 8304 // If this is declared as a bit-field, check the bit-field. 8305 if (!InvalidDecl && BitWidth && 8306 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8307 InvalidDecl = true; 8308 BitWidth = 0; 8309 ZeroWidth = false; 8310 } 8311 8312 // Check that 'mutable' is consistent with the type of the declaration. 8313 if (!InvalidDecl && Mutable) { 8314 unsigned DiagID = 0; 8315 if (T->isReferenceType()) 8316 DiagID = diag::err_mutable_reference; 8317 else if (T.isConstQualified()) 8318 DiagID = diag::err_mutable_const; 8319 8320 if (DiagID) { 8321 SourceLocation ErrLoc = Loc; 8322 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8323 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8324 Diag(ErrLoc, DiagID); 8325 Mutable = false; 8326 InvalidDecl = true; 8327 } 8328 } 8329 8330 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8331 BitWidth, Mutable, HasInit); 8332 if (InvalidDecl) 8333 NewFD->setInvalidDecl(); 8334 8335 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8336 Diag(Loc, diag::err_duplicate_member) << II; 8337 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8338 NewFD->setInvalidDecl(); 8339 } 8340 8341 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8342 if (Record->isUnion()) { 8343 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8344 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8345 if (RDecl->getDefinition()) { 8346 // C++ [class.union]p1: An object of a class with a non-trivial 8347 // constructor, a non-trivial copy constructor, a non-trivial 8348 // destructor, or a non-trivial copy assignment operator 8349 // cannot be a member of a union, nor can an array of such 8350 // objects. 8351 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 8352 NewFD->setInvalidDecl(); 8353 } 8354 } 8355 8356 // C++ [class.union]p1: If a union contains a member of reference type, 8357 // the program is ill-formed. 8358 if (EltTy->isReferenceType()) { 8359 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8360 << NewFD->getDeclName() << EltTy; 8361 NewFD->setInvalidDecl(); 8362 } 8363 } 8364 } 8365 8366 // FIXME: We need to pass in the attributes given an AST 8367 // representation, not a parser representation. 8368 if (D) 8369 // FIXME: What to pass instead of TUScope? 8370 ProcessDeclAttributes(TUScope, NewFD, *D); 8371 8372 // In auto-retain/release, infer strong retension for fields of 8373 // retainable type. 8374 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8375 NewFD->setInvalidDecl(); 8376 8377 if (T.isObjCGCWeak()) 8378 Diag(Loc, diag::warn_attribute_weak_on_field); 8379 8380 NewFD->setAccess(AS); 8381 return NewFD; 8382} 8383 8384bool Sema::CheckNontrivialField(FieldDecl *FD) { 8385 assert(FD); 8386 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8387 8388 if (FD->isInvalidDecl()) 8389 return true; 8390 8391 QualType EltTy = Context.getBaseElementType(FD->getType()); 8392 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8393 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8394 if (RDecl->getDefinition()) { 8395 // We check for copy constructors before constructors 8396 // because otherwise we'll never get complaints about 8397 // copy constructors. 8398 8399 CXXSpecialMember member = CXXInvalid; 8400 if (!RDecl->hasTrivialCopyConstructor()) 8401 member = CXXCopyConstructor; 8402 else if (!RDecl->hasTrivialDefaultConstructor()) 8403 member = CXXDefaultConstructor; 8404 else if (!RDecl->hasTrivialCopyAssignment()) 8405 member = CXXCopyAssignment; 8406 else if (!RDecl->hasTrivialDestructor()) 8407 member = CXXDestructor; 8408 8409 if (member != CXXInvalid) { 8410 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8411 // Objective-C++ ARC: it is an error to have a non-trivial field of 8412 // a union. However, system headers in Objective-C programs 8413 // occasionally have Objective-C lifetime objects within unions, 8414 // and rather than cause the program to fail, we make those 8415 // members unavailable. 8416 SourceLocation Loc = FD->getLocation(); 8417 if (getSourceManager().isInSystemHeader(Loc)) { 8418 if (!FD->hasAttr<UnavailableAttr>()) 8419 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8420 "this system field has retaining ownership")); 8421 return false; 8422 } 8423 } 8424 8425 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 8426 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8427 DiagnoseNontrivial(RT, member); 8428 return true; 8429 } 8430 } 8431 } 8432 8433 return false; 8434} 8435 8436/// DiagnoseNontrivial - Given that a class has a non-trivial 8437/// special member, figure out why. 8438void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8439 QualType QT(T, 0U); 8440 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8441 8442 // Check whether the member was user-declared. 8443 switch (member) { 8444 case CXXInvalid: 8445 break; 8446 8447 case CXXDefaultConstructor: 8448 if (RD->hasUserDeclaredConstructor()) { 8449 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8450 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8451 const FunctionDecl *body = 0; 8452 ci->hasBody(body); 8453 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8454 SourceLocation CtorLoc = ci->getLocation(); 8455 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8456 return; 8457 } 8458 } 8459 8460 llvm_unreachable("found no user-declared constructors"); 8461 } 8462 break; 8463 8464 case CXXCopyConstructor: 8465 if (RD->hasUserDeclaredCopyConstructor()) { 8466 SourceLocation CtorLoc = 8467 RD->getCopyConstructor(0)->getLocation(); 8468 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8469 return; 8470 } 8471 break; 8472 8473 case CXXMoveConstructor: 8474 if (RD->hasUserDeclaredMoveConstructor()) { 8475 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8476 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8477 return; 8478 } 8479 break; 8480 8481 case CXXCopyAssignment: 8482 if (RD->hasUserDeclaredCopyAssignment()) { 8483 // FIXME: this should use the location of the copy 8484 // assignment, not the type. 8485 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8486 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8487 return; 8488 } 8489 break; 8490 8491 case CXXMoveAssignment: 8492 if (RD->hasUserDeclaredMoveAssignment()) { 8493 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8494 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8495 return; 8496 } 8497 break; 8498 8499 case CXXDestructor: 8500 if (RD->hasUserDeclaredDestructor()) { 8501 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8502 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8503 return; 8504 } 8505 break; 8506 } 8507 8508 typedef CXXRecordDecl::base_class_iterator base_iter; 8509 8510 // Virtual bases and members inhibit trivial copying/construction, 8511 // but not trivial destruction. 8512 if (member != CXXDestructor) { 8513 // Check for virtual bases. vbases includes indirect virtual bases, 8514 // so we just iterate through the direct bases. 8515 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8516 if (bi->isVirtual()) { 8517 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8518 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8519 return; 8520 } 8521 8522 // Check for virtual methods. 8523 typedef CXXRecordDecl::method_iterator meth_iter; 8524 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8525 ++mi) { 8526 if (mi->isVirtual()) { 8527 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8528 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8529 return; 8530 } 8531 } 8532 } 8533 8534 bool (CXXRecordDecl::*hasTrivial)() const; 8535 switch (member) { 8536 case CXXDefaultConstructor: 8537 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8538 case CXXCopyConstructor: 8539 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8540 case CXXCopyAssignment: 8541 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8542 case CXXDestructor: 8543 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8544 default: 8545 llvm_unreachable("unexpected special member"); 8546 } 8547 8548 // Check for nontrivial bases (and recurse). 8549 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8550 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8551 assert(BaseRT && "Don't know how to handle dependent bases"); 8552 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8553 if (!(BaseRecTy->*hasTrivial)()) { 8554 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8555 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8556 DiagnoseNontrivial(BaseRT, member); 8557 return; 8558 } 8559 } 8560 8561 // Check for nontrivial members (and recurse). 8562 typedef RecordDecl::field_iterator field_iter; 8563 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8564 ++fi) { 8565 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8566 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8567 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8568 8569 if (!(EltRD->*hasTrivial)()) { 8570 SourceLocation FLoc = (*fi)->getLocation(); 8571 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8572 DiagnoseNontrivial(EltRT, member); 8573 return; 8574 } 8575 } 8576 8577 if (EltTy->isObjCLifetimeType()) { 8578 switch (EltTy.getObjCLifetime()) { 8579 case Qualifiers::OCL_None: 8580 case Qualifiers::OCL_ExplicitNone: 8581 break; 8582 8583 case Qualifiers::OCL_Autoreleasing: 8584 case Qualifiers::OCL_Weak: 8585 case Qualifiers::OCL_Strong: 8586 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8587 << QT << EltTy.getObjCLifetime(); 8588 return; 8589 } 8590 } 8591 } 8592 8593 llvm_unreachable("found no explanation for non-trivial member"); 8594} 8595 8596/// TranslateIvarVisibility - Translate visibility from a token ID to an 8597/// AST enum value. 8598static ObjCIvarDecl::AccessControl 8599TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8600 switch (ivarVisibility) { 8601 default: llvm_unreachable("Unknown visitibility kind"); 8602 case tok::objc_private: return ObjCIvarDecl::Private; 8603 case tok::objc_public: return ObjCIvarDecl::Public; 8604 case tok::objc_protected: return ObjCIvarDecl::Protected; 8605 case tok::objc_package: return ObjCIvarDecl::Package; 8606 } 8607} 8608 8609/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8610/// in order to create an IvarDecl object for it. 8611Decl *Sema::ActOnIvar(Scope *S, 8612 SourceLocation DeclStart, 8613 Declarator &D, Expr *BitfieldWidth, 8614 tok::ObjCKeywordKind Visibility) { 8615 8616 IdentifierInfo *II = D.getIdentifier(); 8617 Expr *BitWidth = (Expr*)BitfieldWidth; 8618 SourceLocation Loc = DeclStart; 8619 if (II) Loc = D.getIdentifierLoc(); 8620 8621 // FIXME: Unnamed fields can be handled in various different ways, for 8622 // example, unnamed unions inject all members into the struct namespace! 8623 8624 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8625 QualType T = TInfo->getType(); 8626 8627 if (BitWidth) { 8628 // 6.7.2.1p3, 6.7.2.1p4 8629 if (VerifyBitField(Loc, II, T, BitWidth)) { 8630 D.setInvalidType(); 8631 BitWidth = 0; 8632 } 8633 } else { 8634 // Not a bitfield. 8635 8636 // validate II. 8637 8638 } 8639 if (T->isReferenceType()) { 8640 Diag(Loc, diag::err_ivar_reference_type); 8641 D.setInvalidType(); 8642 } 8643 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8644 // than a variably modified type. 8645 else if (T->isVariablyModifiedType()) { 8646 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8647 D.setInvalidType(); 8648 } 8649 8650 // Get the visibility (access control) for this ivar. 8651 ObjCIvarDecl::AccessControl ac = 8652 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8653 : ObjCIvarDecl::None; 8654 // Must set ivar's DeclContext to its enclosing interface. 8655 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8656 ObjCContainerDecl *EnclosingContext; 8657 if (ObjCImplementationDecl *IMPDecl = 8658 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8659 if (!LangOpts.ObjCNonFragileABI2) { 8660 // Case of ivar declared in an implementation. Context is that of its class. 8661 EnclosingContext = IMPDecl->getClassInterface(); 8662 assert(EnclosingContext && "Implementation has no class interface!"); 8663 } 8664 else 8665 EnclosingContext = EnclosingDecl; 8666 } else { 8667 if (ObjCCategoryDecl *CDecl = 8668 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8669 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8670 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8671 return 0; 8672 } 8673 } 8674 EnclosingContext = EnclosingDecl; 8675 } 8676 8677 // Construct the decl. 8678 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8679 DeclStart, Loc, II, T, 8680 TInfo, ac, (Expr *)BitfieldWidth); 8681 8682 if (II) { 8683 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8684 ForRedeclaration); 8685 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8686 && !isa<TagDecl>(PrevDecl)) { 8687 Diag(Loc, diag::err_duplicate_member) << II; 8688 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8689 NewID->setInvalidDecl(); 8690 } 8691 } 8692 8693 // Process attributes attached to the ivar. 8694 ProcessDeclAttributes(S, NewID, D); 8695 8696 if (D.isInvalidType()) 8697 NewID->setInvalidDecl(); 8698 8699 // In ARC, infer 'retaining' for ivars of retainable type. 8700 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8701 NewID->setInvalidDecl(); 8702 8703 if (D.getDeclSpec().isModulePrivateSpecified()) 8704 NewID->setModulePrivate(); 8705 8706 if (II) { 8707 // FIXME: When interfaces are DeclContexts, we'll need to add 8708 // these to the interface. 8709 S->AddDecl(NewID); 8710 IdResolver.AddDecl(NewID); 8711 } 8712 8713 return NewID; 8714} 8715 8716/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8717/// class and class extensions. For every class @interface and class 8718/// extension @interface, if the last ivar is a bitfield of any type, 8719/// then add an implicit `char :0` ivar to the end of that interface. 8720void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8721 SmallVectorImpl<Decl *> &AllIvarDecls) { 8722 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8723 return; 8724 8725 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8726 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8727 8728 if (!Ivar->isBitField()) 8729 return; 8730 uint64_t BitFieldSize = 8731 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 8732 if (BitFieldSize == 0) 8733 return; 8734 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8735 if (!ID) { 8736 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8737 if (!CD->IsClassExtension()) 8738 return; 8739 } 8740 // No need to add this to end of @implementation. 8741 else 8742 return; 8743 } 8744 // All conditions are met. Add a new bitfield to the tail end of ivars. 8745 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8746 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8747 8748 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8749 DeclLoc, DeclLoc, 0, 8750 Context.CharTy, 8751 Context.getTrivialTypeSourceInfo(Context.CharTy, 8752 DeclLoc), 8753 ObjCIvarDecl::Private, BW, 8754 true); 8755 AllIvarDecls.push_back(Ivar); 8756} 8757 8758void Sema::ActOnFields(Scope* S, 8759 SourceLocation RecLoc, Decl *EnclosingDecl, 8760 llvm::ArrayRef<Decl *> Fields, 8761 SourceLocation LBrac, SourceLocation RBrac, 8762 AttributeList *Attr) { 8763 assert(EnclosingDecl && "missing record or interface decl"); 8764 8765 // If the decl this is being inserted into is invalid, then it may be a 8766 // redeclaration or some other bogus case. Don't try to add fields to it. 8767 if (EnclosingDecl->isInvalidDecl()) 8768 return; 8769 8770 // Verify that all the fields are okay. 8771 unsigned NumNamedMembers = 0; 8772 SmallVector<FieldDecl*, 32> RecFields; 8773 8774 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8775 bool ARCErrReported = false; 8776 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 8777 i != end; ++i) { 8778 FieldDecl *FD = cast<FieldDecl>(*i); 8779 8780 // Get the type for the field. 8781 const Type *FDTy = FD->getType().getTypePtr(); 8782 8783 if (!FD->isAnonymousStructOrUnion()) { 8784 // Remember all fields written by the user. 8785 RecFields.push_back(FD); 8786 } 8787 8788 // If the field is already invalid for some reason, don't emit more 8789 // diagnostics about it. 8790 if (FD->isInvalidDecl()) { 8791 EnclosingDecl->setInvalidDecl(); 8792 continue; 8793 } 8794 8795 // C99 6.7.2.1p2: 8796 // A structure or union shall not contain a member with 8797 // incomplete or function type (hence, a structure shall not 8798 // contain an instance of itself, but may contain a pointer to 8799 // an instance of itself), except that the last member of a 8800 // structure with more than one named member may have incomplete 8801 // array type; such a structure (and any union containing, 8802 // possibly recursively, a member that is such a structure) 8803 // shall not be a member of a structure or an element of an 8804 // array. 8805 if (FDTy->isFunctionType()) { 8806 // Field declared as a function. 8807 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8808 << FD->getDeclName(); 8809 FD->setInvalidDecl(); 8810 EnclosingDecl->setInvalidDecl(); 8811 continue; 8812 } else if (FDTy->isIncompleteArrayType() && Record && 8813 ((i + 1 == Fields.end() && !Record->isUnion()) || 8814 ((getLangOptions().MicrosoftExt || 8815 getLangOptions().CPlusPlus) && 8816 (i + 1 == Fields.end() || Record->isUnion())))) { 8817 // Flexible array member. 8818 // Microsoft and g++ is more permissive regarding flexible array. 8819 // It will accept flexible array in union and also 8820 // as the sole element of a struct/class. 8821 if (getLangOptions().MicrosoftExt) { 8822 if (Record->isUnion()) 8823 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8824 << FD->getDeclName(); 8825 else if (Fields.size() == 1) 8826 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8827 << FD->getDeclName() << Record->getTagKind(); 8828 } else if (getLangOptions().CPlusPlus) { 8829 if (Record->isUnion()) 8830 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8831 << FD->getDeclName(); 8832 else if (Fields.size() == 1) 8833 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8834 << FD->getDeclName() << Record->getTagKind(); 8835 } else if (NumNamedMembers < 1) { 8836 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8837 << FD->getDeclName(); 8838 FD->setInvalidDecl(); 8839 EnclosingDecl->setInvalidDecl(); 8840 continue; 8841 } 8842 if (!FD->getType()->isDependentType() && 8843 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 8844 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8845 << FD->getDeclName() << FD->getType(); 8846 FD->setInvalidDecl(); 8847 EnclosingDecl->setInvalidDecl(); 8848 continue; 8849 } 8850 // Okay, we have a legal flexible array member at the end of the struct. 8851 if (Record) 8852 Record->setHasFlexibleArrayMember(true); 8853 } else if (!FDTy->isDependentType() && 8854 RequireCompleteType(FD->getLocation(), FD->getType(), 8855 diag::err_field_incomplete)) { 8856 // Incomplete type 8857 FD->setInvalidDecl(); 8858 EnclosingDecl->setInvalidDecl(); 8859 continue; 8860 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8861 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8862 // If this is a member of a union, then entire union becomes "flexible". 8863 if (Record && Record->isUnion()) { 8864 Record->setHasFlexibleArrayMember(true); 8865 } else { 8866 // If this is a struct/class and this is not the last element, reject 8867 // it. Note that GCC supports variable sized arrays in the middle of 8868 // structures. 8869 if (i + 1 != Fields.end()) 8870 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8871 << FD->getDeclName() << FD->getType(); 8872 else { 8873 // We support flexible arrays at the end of structs in 8874 // other structs as an extension. 8875 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8876 << FD->getDeclName(); 8877 if (Record) 8878 Record->setHasFlexibleArrayMember(true); 8879 } 8880 } 8881 } 8882 if (Record && FDTTy->getDecl()->hasObjectMember()) 8883 Record->setHasObjectMember(true); 8884 } else if (FDTy->isObjCObjectType()) { 8885 /// A field cannot be an Objective-c object 8886 Diag(FD->getLocation(), diag::err_statically_allocated_object) 8887 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 8888 QualType T = Context.getObjCObjectPointerType(FD->getType()); 8889 FD->setType(T); 8890 } 8891 else if (!getLangOptions().CPlusPlus) { 8892 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 8893 // It's an error in ARC if a field has lifetime. 8894 // We don't want to report this in a system header, though, 8895 // so we just make the field unavailable. 8896 // FIXME: that's really not sufficient; we need to make the type 8897 // itself invalid to, say, initialize or copy. 8898 QualType T = FD->getType(); 8899 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 8900 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 8901 SourceLocation loc = FD->getLocation(); 8902 if (getSourceManager().isInSystemHeader(loc)) { 8903 if (!FD->hasAttr<UnavailableAttr>()) { 8904 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 8905 "this system field has retaining ownership")); 8906 } 8907 } else { 8908 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 8909 } 8910 ARCErrReported = true; 8911 } 8912 } 8913 else if (getLangOptions().ObjC1 && 8914 getLangOptions().getGC() != LangOptions::NonGC && 8915 Record && !Record->hasObjectMember()) { 8916 if (FD->getType()->isObjCObjectPointerType() || 8917 FD->getType().isObjCGCStrong()) 8918 Record->setHasObjectMember(true); 8919 else if (Context.getAsArrayType(FD->getType())) { 8920 QualType BaseType = Context.getBaseElementType(FD->getType()); 8921 if (BaseType->isRecordType() && 8922 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8923 Record->setHasObjectMember(true); 8924 else if (BaseType->isObjCObjectPointerType() || 8925 BaseType.isObjCGCStrong()) 8926 Record->setHasObjectMember(true); 8927 } 8928 } 8929 } 8930 // Keep track of the number of named members. 8931 if (FD->getIdentifier()) 8932 ++NumNamedMembers; 8933 } 8934 8935 // Okay, we successfully defined 'Record'. 8936 if (Record) { 8937 bool Completed = false; 8938 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8939 if (!CXXRecord->isInvalidDecl()) { 8940 // Set access bits correctly on the directly-declared conversions. 8941 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8942 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8943 I != E; ++I) 8944 Convs->setAccess(I, (*I)->getAccess()); 8945 8946 if (!CXXRecord->isDependentType()) { 8947 // Objective-C Automatic Reference Counting: 8948 // If a class has a non-static data member of Objective-C pointer 8949 // type (or array thereof), it is a non-POD type and its 8950 // default constructor (if any), copy constructor, copy assignment 8951 // operator, and destructor are non-trivial. 8952 // 8953 // This rule is also handled by CXXRecordDecl::completeDefinition(). 8954 // However, here we check whether this particular class is only 8955 // non-POD because of the presence of an Objective-C pointer member. 8956 // If so, objects of this type cannot be shared between code compiled 8957 // with instant objects and code compiled with manual retain/release. 8958 if (getLangOptions().ObjCAutoRefCount && 8959 CXXRecord->hasObjectMember() && 8960 CXXRecord->getLinkage() == ExternalLinkage) { 8961 if (CXXRecord->isPOD()) { 8962 Diag(CXXRecord->getLocation(), 8963 diag::warn_arc_non_pod_class_with_object_member) 8964 << CXXRecord; 8965 } else { 8966 // FIXME: Fix-Its would be nice here, but finding a good location 8967 // for them is going to be tricky. 8968 if (CXXRecord->hasTrivialCopyConstructor()) 8969 Diag(CXXRecord->getLocation(), 8970 diag::warn_arc_trivial_member_function_with_object_member) 8971 << CXXRecord << 0; 8972 if (CXXRecord->hasTrivialCopyAssignment()) 8973 Diag(CXXRecord->getLocation(), 8974 diag::warn_arc_trivial_member_function_with_object_member) 8975 << CXXRecord << 1; 8976 if (CXXRecord->hasTrivialDestructor()) 8977 Diag(CXXRecord->getLocation(), 8978 diag::warn_arc_trivial_member_function_with_object_member) 8979 << CXXRecord << 2; 8980 } 8981 } 8982 8983 // Adjust user-defined destructor exception spec. 8984 if (getLangOptions().CPlusPlus0x && 8985 CXXRecord->hasUserDeclaredDestructor()) 8986 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8987 8988 // Add any implicitly-declared members to this class. 8989 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8990 8991 // If we have virtual base classes, we may end up finding multiple 8992 // final overriders for a given virtual function. Check for this 8993 // problem now. 8994 if (CXXRecord->getNumVBases()) { 8995 CXXFinalOverriderMap FinalOverriders; 8996 CXXRecord->getFinalOverriders(FinalOverriders); 8997 8998 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8999 MEnd = FinalOverriders.end(); 9000 M != MEnd; ++M) { 9001 for (OverridingMethods::iterator SO = M->second.begin(), 9002 SOEnd = M->second.end(); 9003 SO != SOEnd; ++SO) { 9004 assert(SO->second.size() > 0 && 9005 "Virtual function without overridding functions?"); 9006 if (SO->second.size() == 1) 9007 continue; 9008 9009 // C++ [class.virtual]p2: 9010 // In a derived class, if a virtual member function of a base 9011 // class subobject has more than one final overrider the 9012 // program is ill-formed. 9013 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9014 << (NamedDecl *)M->first << Record; 9015 Diag(M->first->getLocation(), 9016 diag::note_overridden_virtual_function); 9017 for (OverridingMethods::overriding_iterator 9018 OM = SO->second.begin(), 9019 OMEnd = SO->second.end(); 9020 OM != OMEnd; ++OM) 9021 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9022 << (NamedDecl *)M->first << OM->Method->getParent(); 9023 9024 Record->setInvalidDecl(); 9025 } 9026 } 9027 CXXRecord->completeDefinition(&FinalOverriders); 9028 Completed = true; 9029 } 9030 } 9031 } 9032 } 9033 9034 if (!Completed) 9035 Record->completeDefinition(); 9036 9037 // Now that the record is complete, do any delayed exception spec checks 9038 // we were missing. 9039 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9040 const CXXDestructorDecl *Dtor = 9041 DelayedDestructorExceptionSpecChecks.back().first; 9042 if (Dtor->getParent() != Record) 9043 break; 9044 9045 assert(!Dtor->getParent()->isDependentType() && 9046 "Should not ever add destructors of templates into the list."); 9047 CheckOverridingFunctionExceptionSpec(Dtor, 9048 DelayedDestructorExceptionSpecChecks.back().second); 9049 DelayedDestructorExceptionSpecChecks.pop_back(); 9050 } 9051 9052 } else { 9053 ObjCIvarDecl **ClsFields = 9054 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9055 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9056 ID->setLocEnd(RBrac); 9057 // Add ivar's to class's DeclContext. 9058 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9059 ClsFields[i]->setLexicalDeclContext(ID); 9060 ID->addDecl(ClsFields[i]); 9061 } 9062 // Must enforce the rule that ivars in the base classes may not be 9063 // duplicates. 9064 if (ID->getSuperClass()) 9065 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9066 } else if (ObjCImplementationDecl *IMPDecl = 9067 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9068 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9069 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9070 // Ivar declared in @implementation never belongs to the implementation. 9071 // Only it is in implementation's lexical context. 9072 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9073 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9074 } else if (ObjCCategoryDecl *CDecl = 9075 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9076 // case of ivars in class extension; all other cases have been 9077 // reported as errors elsewhere. 9078 // FIXME. Class extension does not have a LocEnd field. 9079 // CDecl->setLocEnd(RBrac); 9080 // Add ivar's to class extension's DeclContext. 9081 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9082 ClsFields[i]->setLexicalDeclContext(CDecl); 9083 CDecl->addDecl(ClsFields[i]); 9084 } 9085 } 9086 } 9087 9088 if (Attr) 9089 ProcessDeclAttributeList(S, Record, Attr); 9090 9091 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9092 // set the visibility of this record. 9093 if (Record && !Record->getDeclContext()->isRecord()) 9094 AddPushedVisibilityAttribute(Record); 9095} 9096 9097/// \brief Determine whether the given integral value is representable within 9098/// the given type T. 9099static bool isRepresentableIntegerValue(ASTContext &Context, 9100 llvm::APSInt &Value, 9101 QualType T) { 9102 assert(T->isIntegralType(Context) && "Integral type required!"); 9103 unsigned BitWidth = Context.getIntWidth(T); 9104 9105 if (Value.isUnsigned() || Value.isNonNegative()) { 9106 if (T->isSignedIntegerOrEnumerationType()) 9107 --BitWidth; 9108 return Value.getActiveBits() <= BitWidth; 9109 } 9110 return Value.getMinSignedBits() <= BitWidth; 9111} 9112 9113// \brief Given an integral type, return the next larger integral type 9114// (or a NULL type of no such type exists). 9115static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9116 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9117 // enum checking below. 9118 assert(T->isIntegralType(Context) && "Integral type required!"); 9119 const unsigned NumTypes = 4; 9120 QualType SignedIntegralTypes[NumTypes] = { 9121 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9122 }; 9123 QualType UnsignedIntegralTypes[NumTypes] = { 9124 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9125 Context.UnsignedLongLongTy 9126 }; 9127 9128 unsigned BitWidth = Context.getTypeSize(T); 9129 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9130 : UnsignedIntegralTypes; 9131 for (unsigned I = 0; I != NumTypes; ++I) 9132 if (Context.getTypeSize(Types[I]) > BitWidth) 9133 return Types[I]; 9134 9135 return QualType(); 9136} 9137 9138EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9139 EnumConstantDecl *LastEnumConst, 9140 SourceLocation IdLoc, 9141 IdentifierInfo *Id, 9142 Expr *Val) { 9143 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9144 llvm::APSInt EnumVal(IntWidth); 9145 QualType EltTy; 9146 9147 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9148 Val = 0; 9149 9150 if (Val) { 9151 if (Enum->isDependentType() || Val->isTypeDependent()) 9152 EltTy = Context.DependentTy; 9153 else { 9154 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9155 SourceLocation ExpLoc; 9156 if (!Val->isValueDependent() && 9157 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9158 Val = 0; 9159 } else { 9160 if (!getLangOptions().CPlusPlus) { 9161 // C99 6.7.2.2p2: 9162 // The expression that defines the value of an enumeration constant 9163 // shall be an integer constant expression that has a value 9164 // representable as an int. 9165 9166 // Complain if the value is not representable in an int. 9167 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9168 Diag(IdLoc, diag::ext_enum_value_not_int) 9169 << EnumVal.toString(10) << Val->getSourceRange() 9170 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9171 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9172 // Force the type of the expression to 'int'. 9173 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9174 } 9175 } 9176 9177 if (Enum->isFixed()) { 9178 EltTy = Enum->getIntegerType(); 9179 9180 // C++0x [dcl.enum]p5: 9181 // ... if the initializing value of an enumerator cannot be 9182 // represented by the underlying type, the program is ill-formed. 9183 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9184 if (getLangOptions().MicrosoftExt) { 9185 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9186 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9187 } else 9188 Diag(IdLoc, diag::err_enumerator_too_large) 9189 << EltTy; 9190 } else 9191 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9192 } 9193 else { 9194 // C++0x [dcl.enum]p5: 9195 // If the underlying type is not fixed, the type of each enumerator 9196 // is the type of its initializing value: 9197 // - If an initializer is specified for an enumerator, the 9198 // initializing value has the same type as the expression. 9199 EltTy = Val->getType(); 9200 } 9201 } 9202 } 9203 } 9204 9205 if (!Val) { 9206 if (Enum->isDependentType()) 9207 EltTy = Context.DependentTy; 9208 else if (!LastEnumConst) { 9209 // C++0x [dcl.enum]p5: 9210 // If the underlying type is not fixed, the type of each enumerator 9211 // is the type of its initializing value: 9212 // - If no initializer is specified for the first enumerator, the 9213 // initializing value has an unspecified integral type. 9214 // 9215 // GCC uses 'int' for its unspecified integral type, as does 9216 // C99 6.7.2.2p3. 9217 if (Enum->isFixed()) { 9218 EltTy = Enum->getIntegerType(); 9219 } 9220 else { 9221 EltTy = Context.IntTy; 9222 } 9223 } else { 9224 // Assign the last value + 1. 9225 EnumVal = LastEnumConst->getInitVal(); 9226 ++EnumVal; 9227 EltTy = LastEnumConst->getType(); 9228 9229 // Check for overflow on increment. 9230 if (EnumVal < LastEnumConst->getInitVal()) { 9231 // C++0x [dcl.enum]p5: 9232 // If the underlying type is not fixed, the type of each enumerator 9233 // is the type of its initializing value: 9234 // 9235 // - Otherwise the type of the initializing value is the same as 9236 // the type of the initializing value of the preceding enumerator 9237 // unless the incremented value is not representable in that type, 9238 // in which case the type is an unspecified integral type 9239 // sufficient to contain the incremented value. If no such type 9240 // exists, the program is ill-formed. 9241 QualType T = getNextLargerIntegralType(Context, EltTy); 9242 if (T.isNull() || Enum->isFixed()) { 9243 // There is no integral type larger enough to represent this 9244 // value. Complain, then allow the value to wrap around. 9245 EnumVal = LastEnumConst->getInitVal(); 9246 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9247 ++EnumVal; 9248 if (Enum->isFixed()) 9249 // When the underlying type is fixed, this is ill-formed. 9250 Diag(IdLoc, diag::err_enumerator_wrapped) 9251 << EnumVal.toString(10) 9252 << EltTy; 9253 else 9254 Diag(IdLoc, diag::warn_enumerator_too_large) 9255 << EnumVal.toString(10); 9256 } else { 9257 EltTy = T; 9258 } 9259 9260 // Retrieve the last enumerator's value, extent that type to the 9261 // type that is supposed to be large enough to represent the incremented 9262 // value, then increment. 9263 EnumVal = LastEnumConst->getInitVal(); 9264 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9265 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9266 ++EnumVal; 9267 9268 // If we're not in C++, diagnose the overflow of enumerator values, 9269 // which in C99 means that the enumerator value is not representable in 9270 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9271 // permits enumerator values that are representable in some larger 9272 // integral type. 9273 if (!getLangOptions().CPlusPlus && !T.isNull()) 9274 Diag(IdLoc, diag::warn_enum_value_overflow); 9275 } else if (!getLangOptions().CPlusPlus && 9276 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9277 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9278 Diag(IdLoc, diag::ext_enum_value_not_int) 9279 << EnumVal.toString(10) << 1; 9280 } 9281 } 9282 } 9283 9284 if (!EltTy->isDependentType()) { 9285 // Make the enumerator value match the signedness and size of the 9286 // enumerator's type. 9287 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9288 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9289 } 9290 9291 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9292 Val, EnumVal); 9293} 9294 9295 9296Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9297 SourceLocation IdLoc, IdentifierInfo *Id, 9298 AttributeList *Attr, 9299 SourceLocation EqualLoc, Expr *val) { 9300 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9301 EnumConstantDecl *LastEnumConst = 9302 cast_or_null<EnumConstantDecl>(lastEnumConst); 9303 Expr *Val = static_cast<Expr*>(val); 9304 9305 // The scope passed in may not be a decl scope. Zip up the scope tree until 9306 // we find one that is. 9307 S = getNonFieldDeclScope(S); 9308 9309 // Verify that there isn't already something declared with this name in this 9310 // scope. 9311 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9312 ForRedeclaration); 9313 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9314 // Maybe we will complain about the shadowed template parameter. 9315 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9316 // Just pretend that we didn't see the previous declaration. 9317 PrevDecl = 0; 9318 } 9319 9320 if (PrevDecl) { 9321 // When in C++, we may get a TagDecl with the same name; in this case the 9322 // enum constant will 'hide' the tag. 9323 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9324 "Received TagDecl when not in C++!"); 9325 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9326 if (isa<EnumConstantDecl>(PrevDecl)) 9327 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9328 else 9329 Diag(IdLoc, diag::err_redefinition) << Id; 9330 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9331 return 0; 9332 } 9333 } 9334 9335 // C++ [class.mem]p13: 9336 // If T is the name of a class, then each of the following shall have a 9337 // name different from T: 9338 // - every enumerator of every member of class T that is an enumerated 9339 // type 9340 if (CXXRecordDecl *Record 9341 = dyn_cast<CXXRecordDecl>( 9342 TheEnumDecl->getDeclContext()->getRedeclContext())) 9343 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9344 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9345 9346 EnumConstantDecl *New = 9347 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9348 9349 if (New) { 9350 // Process attributes. 9351 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9352 9353 // Register this decl in the current scope stack. 9354 New->setAccess(TheEnumDecl->getAccess()); 9355 PushOnScopeChains(New, S); 9356 } 9357 9358 return New; 9359} 9360 9361void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9362 SourceLocation RBraceLoc, Decl *EnumDeclX, 9363 Decl **Elements, unsigned NumElements, 9364 Scope *S, AttributeList *Attr) { 9365 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9366 QualType EnumType = Context.getTypeDeclType(Enum); 9367 9368 if (Attr) 9369 ProcessDeclAttributeList(S, Enum, Attr); 9370 9371 if (Enum->isDependentType()) { 9372 for (unsigned i = 0; i != NumElements; ++i) { 9373 EnumConstantDecl *ECD = 9374 cast_or_null<EnumConstantDecl>(Elements[i]); 9375 if (!ECD) continue; 9376 9377 ECD->setType(EnumType); 9378 } 9379 9380 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9381 return; 9382 } 9383 9384 // TODO: If the result value doesn't fit in an int, it must be a long or long 9385 // long value. ISO C does not support this, but GCC does as an extension, 9386 // emit a warning. 9387 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9388 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9389 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9390 9391 // Verify that all the values are okay, compute the size of the values, and 9392 // reverse the list. 9393 unsigned NumNegativeBits = 0; 9394 unsigned NumPositiveBits = 0; 9395 9396 // Keep track of whether all elements have type int. 9397 bool AllElementsInt = true; 9398 9399 for (unsigned i = 0; i != NumElements; ++i) { 9400 EnumConstantDecl *ECD = 9401 cast_or_null<EnumConstantDecl>(Elements[i]); 9402 if (!ECD) continue; // Already issued a diagnostic. 9403 9404 const llvm::APSInt &InitVal = ECD->getInitVal(); 9405 9406 // Keep track of the size of positive and negative values. 9407 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9408 NumPositiveBits = std::max(NumPositiveBits, 9409 (unsigned)InitVal.getActiveBits()); 9410 else 9411 NumNegativeBits = std::max(NumNegativeBits, 9412 (unsigned)InitVal.getMinSignedBits()); 9413 9414 // Keep track of whether every enum element has type int (very commmon). 9415 if (AllElementsInt) 9416 AllElementsInt = ECD->getType() == Context.IntTy; 9417 } 9418 9419 // Figure out the type that should be used for this enum. 9420 QualType BestType; 9421 unsigned BestWidth; 9422 9423 // C++0x N3000 [conv.prom]p3: 9424 // An rvalue of an unscoped enumeration type whose underlying 9425 // type is not fixed can be converted to an rvalue of the first 9426 // of the following types that can represent all the values of 9427 // the enumeration: int, unsigned int, long int, unsigned long 9428 // int, long long int, or unsigned long long int. 9429 // C99 6.4.4.3p2: 9430 // An identifier declared as an enumeration constant has type int. 9431 // The C99 rule is modified by a gcc extension 9432 QualType BestPromotionType; 9433 9434 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9435 // -fshort-enums is the equivalent to specifying the packed attribute on all 9436 // enum definitions. 9437 if (LangOpts.ShortEnums) 9438 Packed = true; 9439 9440 if (Enum->isFixed()) { 9441 BestType = BestPromotionType = Enum->getIntegerType(); 9442 // We don't need to set BestWidth, because BestType is going to be the type 9443 // of the enumerators, but we do anyway because otherwise some compilers 9444 // warn that it might be used uninitialized. 9445 BestWidth = CharWidth; 9446 } 9447 else if (NumNegativeBits) { 9448 // If there is a negative value, figure out the smallest integer type (of 9449 // int/long/longlong) that fits. 9450 // If it's packed, check also if it fits a char or a short. 9451 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9452 BestType = Context.SignedCharTy; 9453 BestWidth = CharWidth; 9454 } else if (Packed && NumNegativeBits <= ShortWidth && 9455 NumPositiveBits < ShortWidth) { 9456 BestType = Context.ShortTy; 9457 BestWidth = ShortWidth; 9458 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9459 BestType = Context.IntTy; 9460 BestWidth = IntWidth; 9461 } else { 9462 BestWidth = Context.getTargetInfo().getLongWidth(); 9463 9464 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9465 BestType = Context.LongTy; 9466 } else { 9467 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9468 9469 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9470 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9471 BestType = Context.LongLongTy; 9472 } 9473 } 9474 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9475 } else { 9476 // If there is no negative value, figure out the smallest type that fits 9477 // all of the enumerator values. 9478 // If it's packed, check also if it fits a char or a short. 9479 if (Packed && NumPositiveBits <= CharWidth) { 9480 BestType = Context.UnsignedCharTy; 9481 BestPromotionType = Context.IntTy; 9482 BestWidth = CharWidth; 9483 } else if (Packed && NumPositiveBits <= ShortWidth) { 9484 BestType = Context.UnsignedShortTy; 9485 BestPromotionType = Context.IntTy; 9486 BestWidth = ShortWidth; 9487 } else if (NumPositiveBits <= IntWidth) { 9488 BestType = Context.UnsignedIntTy; 9489 BestWidth = IntWidth; 9490 BestPromotionType 9491 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9492 ? Context.UnsignedIntTy : Context.IntTy; 9493 } else if (NumPositiveBits <= 9494 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9495 BestType = Context.UnsignedLongTy; 9496 BestPromotionType 9497 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9498 ? Context.UnsignedLongTy : Context.LongTy; 9499 } else { 9500 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9501 assert(NumPositiveBits <= BestWidth && 9502 "How could an initializer get larger than ULL?"); 9503 BestType = Context.UnsignedLongLongTy; 9504 BestPromotionType 9505 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9506 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9507 } 9508 } 9509 9510 // Loop over all of the enumerator constants, changing their types to match 9511 // the type of the enum if needed. 9512 for (unsigned i = 0; i != NumElements; ++i) { 9513 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9514 if (!ECD) continue; // Already issued a diagnostic. 9515 9516 // Standard C says the enumerators have int type, but we allow, as an 9517 // extension, the enumerators to be larger than int size. If each 9518 // enumerator value fits in an int, type it as an int, otherwise type it the 9519 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9520 // that X has type 'int', not 'unsigned'. 9521 9522 // Determine whether the value fits into an int. 9523 llvm::APSInt InitVal = ECD->getInitVal(); 9524 9525 // If it fits into an integer type, force it. Otherwise force it to match 9526 // the enum decl type. 9527 QualType NewTy; 9528 unsigned NewWidth; 9529 bool NewSign; 9530 if (!getLangOptions().CPlusPlus && 9531 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9532 NewTy = Context.IntTy; 9533 NewWidth = IntWidth; 9534 NewSign = true; 9535 } else if (ECD->getType() == BestType) { 9536 // Already the right type! 9537 if (getLangOptions().CPlusPlus) 9538 // C++ [dcl.enum]p4: Following the closing brace of an 9539 // enum-specifier, each enumerator has the type of its 9540 // enumeration. 9541 ECD->setType(EnumType); 9542 continue; 9543 } else { 9544 NewTy = BestType; 9545 NewWidth = BestWidth; 9546 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9547 } 9548 9549 // Adjust the APSInt value. 9550 InitVal = InitVal.extOrTrunc(NewWidth); 9551 InitVal.setIsSigned(NewSign); 9552 ECD->setInitVal(InitVal); 9553 9554 // Adjust the Expr initializer and type. 9555 if (ECD->getInitExpr() && 9556 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9557 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9558 CK_IntegralCast, 9559 ECD->getInitExpr(), 9560 /*base paths*/ 0, 9561 VK_RValue)); 9562 if (getLangOptions().CPlusPlus) 9563 // C++ [dcl.enum]p4: Following the closing brace of an 9564 // enum-specifier, each enumerator has the type of its 9565 // enumeration. 9566 ECD->setType(EnumType); 9567 else 9568 ECD->setType(NewTy); 9569 } 9570 9571 Enum->completeDefinition(BestType, BestPromotionType, 9572 NumPositiveBits, NumNegativeBits); 9573} 9574 9575Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9576 SourceLocation StartLoc, 9577 SourceLocation EndLoc) { 9578 StringLiteral *AsmString = cast<StringLiteral>(expr); 9579 9580 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9581 AsmString, StartLoc, 9582 EndLoc); 9583 CurContext->addDecl(New); 9584 return New; 9585} 9586 9587DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9588 IdentifierInfo &ModuleName, 9589 SourceLocation ModuleNameLoc) { 9590 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9591 ModuleName, ModuleNameLoc); 9592 if (!Module) 9593 return true; 9594 9595 // FIXME: Actually create a declaration to describe the module import. 9596 (void)Module; 9597 return DeclResult((Decl *)0); 9598} 9599 9600void 9601Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9602 SourceLocation ModulePrivateKeyword) { 9603 assert(!Old->isModulePrivate() && "Old is module-private!"); 9604 9605 Diag(New->getLocation(), diag::err_module_private_follows_public) 9606 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9607 Diag(Old->getLocation(), diag::note_previous_declaration) 9608 << Old->getDeclName(); 9609 9610 // Drop the __module_private__ from the new declaration, since it's invalid. 9611 New->setModulePrivate(false); 9612} 9613 9614void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9615 SourceLocation PragmaLoc, 9616 SourceLocation NameLoc) { 9617 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9618 9619 if (PrevDecl) { 9620 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9621 } else { 9622 (void)WeakUndeclaredIdentifiers.insert( 9623 std::pair<IdentifierInfo*,WeakInfo> 9624 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9625 } 9626} 9627 9628void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9629 IdentifierInfo* AliasName, 9630 SourceLocation PragmaLoc, 9631 SourceLocation NameLoc, 9632 SourceLocation AliasNameLoc) { 9633 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9634 LookupOrdinaryName); 9635 WeakInfo W = WeakInfo(Name, NameLoc); 9636 9637 if (PrevDecl) { 9638 if (!PrevDecl->hasAttr<AliasAttr>()) 9639 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9640 DeclApplyPragmaWeak(TUScope, ND, W); 9641 } else { 9642 (void)WeakUndeclaredIdentifiers.insert( 9643 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9644 } 9645} 9646 9647Decl *Sema::getObjCDeclContext() const { 9648 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9649} 9650