SemaDecl.cpp revision 491306a83c4f0f49f95a3bcbca8580cb98a91c7a
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 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2007 for (ObjCMethodDecl::param_iterator 2008 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2009 ni != ne; ++ni, ++oi) 2010 mergeParamDeclAttributes(*ni, *oi, Context); 2011 2012 CheckObjCMethodOverride(newMethod, oldMethod, true); 2013} 2014 2015/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2016/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2017/// emitting diagnostics as appropriate. 2018/// 2019/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2020/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2021/// check them before the initializer is attached. 2022/// 2023void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2024 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2025 return; 2026 2027 QualType MergedT; 2028 if (getLangOptions().CPlusPlus) { 2029 AutoType *AT = New->getType()->getContainedAutoType(); 2030 if (AT && !AT->isDeduced()) { 2031 // We don't know what the new type is until the initializer is attached. 2032 return; 2033 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2034 // These could still be something that needs exception specs checked. 2035 return MergeVarDeclExceptionSpecs(New, Old); 2036 } 2037 // C++ [basic.link]p10: 2038 // [...] the types specified by all declarations referring to a given 2039 // object or function shall be identical, except that declarations for an 2040 // array object can specify array types that differ by the presence or 2041 // absence of a major array bound (8.3.4). 2042 else if (Old->getType()->isIncompleteArrayType() && 2043 New->getType()->isArrayType()) { 2044 CanQual<ArrayType> OldArray 2045 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2046 CanQual<ArrayType> NewArray 2047 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2048 if (OldArray->getElementType() == NewArray->getElementType()) 2049 MergedT = New->getType(); 2050 } else if (Old->getType()->isArrayType() && 2051 New->getType()->isIncompleteArrayType()) { 2052 CanQual<ArrayType> OldArray 2053 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2054 CanQual<ArrayType> NewArray 2055 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2056 if (OldArray->getElementType() == NewArray->getElementType()) 2057 MergedT = Old->getType(); 2058 } else if (New->getType()->isObjCObjectPointerType() 2059 && Old->getType()->isObjCObjectPointerType()) { 2060 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2061 Old->getType()); 2062 } 2063 } else { 2064 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2065 } 2066 if (MergedT.isNull()) { 2067 Diag(New->getLocation(), diag::err_redefinition_different_type) 2068 << New->getDeclName(); 2069 Diag(Old->getLocation(), diag::note_previous_definition); 2070 return New->setInvalidDecl(); 2071 } 2072 New->setType(MergedT); 2073} 2074 2075/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2076/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2077/// situation, merging decls or emitting diagnostics as appropriate. 2078/// 2079/// Tentative definition rules (C99 6.9.2p2) are checked by 2080/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2081/// definitions here, since the initializer hasn't been attached. 2082/// 2083void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2084 // If the new decl is already invalid, don't do any other checking. 2085 if (New->isInvalidDecl()) 2086 return; 2087 2088 // Verify the old decl was also a variable. 2089 VarDecl *Old = 0; 2090 if (!Previous.isSingleResult() || 2091 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2092 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2093 << New->getDeclName(); 2094 Diag(Previous.getRepresentativeDecl()->getLocation(), 2095 diag::note_previous_definition); 2096 return New->setInvalidDecl(); 2097 } 2098 2099 // C++ [class.mem]p1: 2100 // A member shall not be declared twice in the member-specification [...] 2101 // 2102 // Here, we need only consider static data members. 2103 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2104 Diag(New->getLocation(), diag::err_duplicate_member) 2105 << New->getIdentifier(); 2106 Diag(Old->getLocation(), diag::note_previous_declaration); 2107 New->setInvalidDecl(); 2108 } 2109 2110 mergeDeclAttributes(New, Old, Context); 2111 // Warn if an already-declared variable is made a weak_import in a subsequent declaration 2112 if (New->getAttr<WeakImportAttr>() && 2113 Old->getStorageClass() == SC_None && 2114 !Old->getAttr<WeakImportAttr>()) { 2115 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2116 Diag(Old->getLocation(), diag::note_previous_definition); 2117 // Remove weak_import attribute on new declaration. 2118 New->dropAttr<WeakImportAttr>(); 2119 } 2120 2121 // Merge the types. 2122 MergeVarDeclTypes(New, Old); 2123 if (New->isInvalidDecl()) 2124 return; 2125 2126 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2127 if (New->getStorageClass() == SC_Static && 2128 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2129 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2130 Diag(Old->getLocation(), diag::note_previous_definition); 2131 return New->setInvalidDecl(); 2132 } 2133 // C99 6.2.2p4: 2134 // For an identifier declared with the storage-class specifier 2135 // extern in a scope in which a prior declaration of that 2136 // identifier is visible,23) if the prior declaration specifies 2137 // internal or external linkage, the linkage of the identifier at 2138 // the later declaration is the same as the linkage specified at 2139 // the prior declaration. If no prior declaration is visible, or 2140 // if the prior declaration specifies no linkage, then the 2141 // identifier has external linkage. 2142 if (New->hasExternalStorage() && Old->hasLinkage()) 2143 /* Okay */; 2144 else if (New->getStorageClass() != SC_Static && 2145 Old->getStorageClass() == SC_Static) { 2146 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2147 Diag(Old->getLocation(), diag::note_previous_definition); 2148 return New->setInvalidDecl(); 2149 } 2150 2151 // Check if extern is followed by non-extern and vice-versa. 2152 if (New->hasExternalStorage() && 2153 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2154 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2155 Diag(Old->getLocation(), diag::note_previous_definition); 2156 return New->setInvalidDecl(); 2157 } 2158 if (Old->hasExternalStorage() && 2159 !New->hasLinkage() && New->isLocalVarDecl()) { 2160 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2161 Diag(Old->getLocation(), diag::note_previous_definition); 2162 return New->setInvalidDecl(); 2163 } 2164 2165 // __module_private__ is propagated to later declarations. 2166 if (Old->isModulePrivate()) 2167 New->setModulePrivate(); 2168 else if (New->isModulePrivate()) 2169 diagnoseModulePrivateRedeclaration(New, Old); 2170 2171 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2172 2173 // FIXME: The test for external storage here seems wrong? We still 2174 // need to check for mismatches. 2175 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2176 // Don't complain about out-of-line definitions of static members. 2177 !(Old->getLexicalDeclContext()->isRecord() && 2178 !New->getLexicalDeclContext()->isRecord())) { 2179 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2180 Diag(Old->getLocation(), diag::note_previous_definition); 2181 return New->setInvalidDecl(); 2182 } 2183 2184 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2185 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2186 Diag(Old->getLocation(), diag::note_previous_definition); 2187 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2188 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2189 Diag(Old->getLocation(), diag::note_previous_definition); 2190 } 2191 2192 // C++ doesn't have tentative definitions, so go right ahead and check here. 2193 const VarDecl *Def; 2194 if (getLangOptions().CPlusPlus && 2195 New->isThisDeclarationADefinition() == VarDecl::Definition && 2196 (Def = Old->getDefinition())) { 2197 Diag(New->getLocation(), diag::err_redefinition) 2198 << New->getDeclName(); 2199 Diag(Def->getLocation(), diag::note_previous_definition); 2200 New->setInvalidDecl(); 2201 return; 2202 } 2203 // c99 6.2.2 P4. 2204 // For an identifier declared with the storage-class specifier extern in a 2205 // scope in which a prior declaration of that identifier is visible, if 2206 // the prior declaration specifies internal or external linkage, the linkage 2207 // of the identifier at the later declaration is the same as the linkage 2208 // specified at the prior declaration. 2209 // FIXME. revisit this code. 2210 if (New->hasExternalStorage() && 2211 Old->getLinkage() == InternalLinkage && 2212 New->getDeclContext() == Old->getDeclContext()) 2213 New->setStorageClass(Old->getStorageClass()); 2214 2215 // Keep a chain of previous declarations. 2216 New->setPreviousDeclaration(Old); 2217 2218 // Inherit access appropriately. 2219 New->setAccess(Old->getAccess()); 2220} 2221 2222/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2223/// no declarator (e.g. "struct foo;") is parsed. 2224Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2225 DeclSpec &DS) { 2226 return ParsedFreeStandingDeclSpec(S, AS, DS, 2227 MultiTemplateParamsArg(*this, 0, 0)); 2228} 2229 2230/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2231/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2232/// parameters to cope with template friend declarations. 2233Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2234 DeclSpec &DS, 2235 MultiTemplateParamsArg TemplateParams) { 2236 Decl *TagD = 0; 2237 TagDecl *Tag = 0; 2238 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2239 DS.getTypeSpecType() == DeclSpec::TST_struct || 2240 DS.getTypeSpecType() == DeclSpec::TST_union || 2241 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2242 TagD = DS.getRepAsDecl(); 2243 2244 if (!TagD) // We probably had an error 2245 return 0; 2246 2247 // Note that the above type specs guarantee that the 2248 // type rep is a Decl, whereas in many of the others 2249 // it's a Type. 2250 Tag = dyn_cast<TagDecl>(TagD); 2251 } 2252 2253 if (Tag) 2254 Tag->setFreeStanding(); 2255 2256 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2257 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2258 // or incomplete types shall not be restrict-qualified." 2259 if (TypeQuals & DeclSpec::TQ_restrict) 2260 Diag(DS.getRestrictSpecLoc(), 2261 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2262 << DS.getSourceRange(); 2263 } 2264 2265 if (DS.isConstexprSpecified()) { 2266 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2267 // and definitions of functions and variables. 2268 if (Tag) 2269 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2270 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2271 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2272 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2273 else 2274 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2275 // Don't emit warnings after this error. 2276 return TagD; 2277 } 2278 2279 if (DS.isFriendSpecified()) { 2280 // If we're dealing with a decl but not a TagDecl, assume that 2281 // whatever routines created it handled the friendship aspect. 2282 if (TagD && !Tag) 2283 return 0; 2284 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2285 } 2286 2287 // Track whether we warned about the fact that there aren't any 2288 // declarators. 2289 bool emittedWarning = false; 2290 2291 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2292 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2293 2294 if (!Record->getDeclName() && Record->isDefinition() && 2295 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2296 if (getLangOptions().CPlusPlus || 2297 Record->getDeclContext()->isRecord()) 2298 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2299 2300 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2301 << DS.getSourceRange(); 2302 emittedWarning = true; 2303 } 2304 } 2305 2306 // Check for Microsoft C extension: anonymous struct. 2307 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2308 CurContext->isRecord() && 2309 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2310 // Handle 2 kinds of anonymous struct: 2311 // struct STRUCT; 2312 // and 2313 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2314 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2315 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2316 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2317 DS.getRepAsType().get()->isStructureType())) { 2318 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2319 << DS.getSourceRange(); 2320 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2321 } 2322 } 2323 2324 if (getLangOptions().CPlusPlus && 2325 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2326 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2327 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2328 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2329 Diag(Enum->getLocation(), diag::ext_no_declarators) 2330 << DS.getSourceRange(); 2331 emittedWarning = true; 2332 } 2333 2334 // Skip all the checks below if we have a type error. 2335 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2336 2337 if (!DS.isMissingDeclaratorOk()) { 2338 // Warn about typedefs of enums without names, since this is an 2339 // extension in both Microsoft and GNU. 2340 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2341 Tag && isa<EnumDecl>(Tag)) { 2342 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2343 << DS.getSourceRange(); 2344 return Tag; 2345 } 2346 2347 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2348 << DS.getSourceRange(); 2349 emittedWarning = true; 2350 } 2351 2352 // We're going to complain about a bunch of spurious specifiers; 2353 // only do this if we're declaring a tag, because otherwise we 2354 // should be getting diag::ext_no_declarators. 2355 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2356 return TagD; 2357 2358 // Note that a linkage-specification sets a storage class, but 2359 // 'extern "C" struct foo;' is actually valid and not theoretically 2360 // useless. 2361 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2362 if (!DS.isExternInLinkageSpec()) 2363 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2364 << DeclSpec::getSpecifierName(scs); 2365 2366 if (DS.isThreadSpecified()) 2367 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2368 if (DS.getTypeQualifiers()) { 2369 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2370 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2371 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2372 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2373 // Restrict is covered above. 2374 } 2375 if (DS.isInlineSpecified()) 2376 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2377 if (DS.isVirtualSpecified()) 2378 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2379 if (DS.isExplicitSpecified()) 2380 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2381 2382 if (DS.isModulePrivateSpecified() && 2383 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2384 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2385 << Tag->getTagKind() 2386 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2387 2388 // FIXME: Warn on useless attributes 2389 2390 return TagD; 2391} 2392 2393/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2394/// builds a statement for it and returns it so it is evaluated. 2395StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2396 StmtResult R; 2397 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2398 Expr *Exp = DS.getRepAsExpr(); 2399 QualType Ty = Exp->getType(); 2400 if (Ty->isPointerType()) { 2401 do 2402 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2403 while (Ty->isPointerType()); 2404 } 2405 if (Ty->isVariableArrayType()) { 2406 R = ActOnExprStmt(MakeFullExpr(Exp)); 2407 } 2408 } 2409 return R; 2410} 2411 2412/// We are trying to inject an anonymous member into the given scope; 2413/// check if there's an existing declaration that can't be overloaded. 2414/// 2415/// \return true if this is a forbidden redeclaration 2416static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2417 Scope *S, 2418 DeclContext *Owner, 2419 DeclarationName Name, 2420 SourceLocation NameLoc, 2421 unsigned diagnostic) { 2422 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2423 Sema::ForRedeclaration); 2424 if (!SemaRef.LookupName(R, S)) return false; 2425 2426 if (R.getAsSingle<TagDecl>()) 2427 return false; 2428 2429 // Pick a representative declaration. 2430 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2431 assert(PrevDecl && "Expected a non-null Decl"); 2432 2433 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2434 return false; 2435 2436 SemaRef.Diag(NameLoc, diagnostic) << Name; 2437 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2438 2439 return true; 2440} 2441 2442/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2443/// anonymous struct or union AnonRecord into the owning context Owner 2444/// and scope S. This routine will be invoked just after we realize 2445/// that an unnamed union or struct is actually an anonymous union or 2446/// struct, e.g., 2447/// 2448/// @code 2449/// union { 2450/// int i; 2451/// float f; 2452/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2453/// // f into the surrounding scope.x 2454/// @endcode 2455/// 2456/// This routine is recursive, injecting the names of nested anonymous 2457/// structs/unions into the owning context and scope as well. 2458static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2459 DeclContext *Owner, 2460 RecordDecl *AnonRecord, 2461 AccessSpecifier AS, 2462 SmallVector<NamedDecl*, 2> &Chaining, 2463 bool MSAnonStruct) { 2464 unsigned diagKind 2465 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2466 : diag::err_anonymous_struct_member_redecl; 2467 2468 bool Invalid = false; 2469 2470 // Look every FieldDecl and IndirectFieldDecl with a name. 2471 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2472 DEnd = AnonRecord->decls_end(); 2473 D != DEnd; ++D) { 2474 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2475 cast<NamedDecl>(*D)->getDeclName()) { 2476 ValueDecl *VD = cast<ValueDecl>(*D); 2477 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2478 VD->getLocation(), diagKind)) { 2479 // C++ [class.union]p2: 2480 // The names of the members of an anonymous union shall be 2481 // distinct from the names of any other entity in the 2482 // scope in which the anonymous union is declared. 2483 Invalid = true; 2484 } else { 2485 // C++ [class.union]p2: 2486 // For the purpose of name lookup, after the anonymous union 2487 // definition, the members of the anonymous union are 2488 // considered to have been defined in the scope in which the 2489 // anonymous union is declared. 2490 unsigned OldChainingSize = Chaining.size(); 2491 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2492 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2493 PE = IF->chain_end(); PI != PE; ++PI) 2494 Chaining.push_back(*PI); 2495 else 2496 Chaining.push_back(VD); 2497 2498 assert(Chaining.size() >= 2); 2499 NamedDecl **NamedChain = 2500 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2501 for (unsigned i = 0; i < Chaining.size(); i++) 2502 NamedChain[i] = Chaining[i]; 2503 2504 IndirectFieldDecl* IndirectField = 2505 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2506 VD->getIdentifier(), VD->getType(), 2507 NamedChain, Chaining.size()); 2508 2509 IndirectField->setAccess(AS); 2510 IndirectField->setImplicit(); 2511 SemaRef.PushOnScopeChains(IndirectField, S); 2512 2513 // That includes picking up the appropriate access specifier. 2514 if (AS != AS_none) IndirectField->setAccess(AS); 2515 2516 Chaining.resize(OldChainingSize); 2517 } 2518 } 2519 } 2520 2521 return Invalid; 2522} 2523 2524/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2525/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2526/// illegal input values are mapped to SC_None. 2527static StorageClass 2528StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2529 switch (StorageClassSpec) { 2530 case DeclSpec::SCS_unspecified: return SC_None; 2531 case DeclSpec::SCS_extern: return SC_Extern; 2532 case DeclSpec::SCS_static: return SC_Static; 2533 case DeclSpec::SCS_auto: return SC_Auto; 2534 case DeclSpec::SCS_register: return SC_Register; 2535 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2536 // Illegal SCSs map to None: error reporting is up to the caller. 2537 case DeclSpec::SCS_mutable: // Fall through. 2538 case DeclSpec::SCS_typedef: return SC_None; 2539 } 2540 llvm_unreachable("unknown storage class specifier"); 2541} 2542 2543/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2544/// a StorageClass. Any error reporting is up to the caller: 2545/// illegal input values are mapped to SC_None. 2546static StorageClass 2547StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2548 switch (StorageClassSpec) { 2549 case DeclSpec::SCS_unspecified: return SC_None; 2550 case DeclSpec::SCS_extern: return SC_Extern; 2551 case DeclSpec::SCS_static: return SC_Static; 2552 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2553 // Illegal SCSs map to None: error reporting is up to the caller. 2554 case DeclSpec::SCS_auto: // Fall through. 2555 case DeclSpec::SCS_mutable: // Fall through. 2556 case DeclSpec::SCS_register: // Fall through. 2557 case DeclSpec::SCS_typedef: return SC_None; 2558 } 2559 llvm_unreachable("unknown storage class specifier"); 2560} 2561 2562/// BuildAnonymousStructOrUnion - Handle the declaration of an 2563/// anonymous structure or union. Anonymous unions are a C++ feature 2564/// (C++ [class.union]) and a GNU C extension; anonymous structures 2565/// are a GNU C and GNU C++ extension. 2566Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2567 AccessSpecifier AS, 2568 RecordDecl *Record) { 2569 DeclContext *Owner = Record->getDeclContext(); 2570 2571 // Diagnose whether this anonymous struct/union is an extension. 2572 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2573 Diag(Record->getLocation(), diag::ext_anonymous_union); 2574 else if (!Record->isUnion()) 2575 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2576 2577 // C and C++ require different kinds of checks for anonymous 2578 // structs/unions. 2579 bool Invalid = false; 2580 if (getLangOptions().CPlusPlus) { 2581 const char* PrevSpec = 0; 2582 unsigned DiagID; 2583 // C++ [class.union]p3: 2584 // Anonymous unions declared in a named namespace or in the 2585 // global namespace shall be declared static. 2586 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2587 (isa<TranslationUnitDecl>(Owner) || 2588 (isa<NamespaceDecl>(Owner) && 2589 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2590 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2591 Invalid = true; 2592 2593 // Recover by adding 'static'. 2594 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2595 PrevSpec, DiagID, getLangOptions()); 2596 } 2597 // C++ [class.union]p3: 2598 // A storage class is not allowed in a declaration of an 2599 // anonymous union in a class scope. 2600 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2601 isa<RecordDecl>(Owner)) { 2602 Diag(DS.getStorageClassSpecLoc(), 2603 diag::err_anonymous_union_with_storage_spec); 2604 Invalid = true; 2605 2606 // Recover by removing the storage specifier. 2607 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2608 PrevSpec, DiagID, getLangOptions()); 2609 } 2610 2611 // Ignore const/volatile/restrict qualifiers. 2612 if (DS.getTypeQualifiers()) { 2613 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2614 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2615 << Record->isUnion() << 0 2616 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2617 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2618 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2619 << Record->isUnion() << 1 2620 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2621 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2622 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2623 << Record->isUnion() << 2 2624 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2625 2626 DS.ClearTypeQualifiers(); 2627 } 2628 2629 // C++ [class.union]p2: 2630 // The member-specification of an anonymous union shall only 2631 // define non-static data members. [Note: nested types and 2632 // functions cannot be declared within an anonymous union. ] 2633 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2634 MemEnd = Record->decls_end(); 2635 Mem != MemEnd; ++Mem) { 2636 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2637 // C++ [class.union]p3: 2638 // An anonymous union shall not have private or protected 2639 // members (clause 11). 2640 assert(FD->getAccess() != AS_none); 2641 if (FD->getAccess() != AS_public) { 2642 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2643 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2644 Invalid = true; 2645 } 2646 2647 // C++ [class.union]p1 2648 // An object of a class with a non-trivial constructor, a non-trivial 2649 // copy constructor, a non-trivial destructor, or a non-trivial copy 2650 // assignment operator cannot be a member of a union, nor can an 2651 // array of such objects. 2652 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2653 Invalid = true; 2654 } else if ((*Mem)->isImplicit()) { 2655 // Any implicit members are fine. 2656 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2657 // This is a type that showed up in an 2658 // elaborated-type-specifier inside the anonymous struct or 2659 // union, but which actually declares a type outside of the 2660 // anonymous struct or union. It's okay. 2661 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2662 if (!MemRecord->isAnonymousStructOrUnion() && 2663 MemRecord->getDeclName()) { 2664 // Visual C++ allows type definition in anonymous struct or union. 2665 if (getLangOptions().MicrosoftExt) 2666 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2667 << (int)Record->isUnion(); 2668 else { 2669 // This is a nested type declaration. 2670 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2671 << (int)Record->isUnion(); 2672 Invalid = true; 2673 } 2674 } 2675 } else if (isa<AccessSpecDecl>(*Mem)) { 2676 // Any access specifier is fine. 2677 } else { 2678 // We have something that isn't a non-static data 2679 // member. Complain about it. 2680 unsigned DK = diag::err_anonymous_record_bad_member; 2681 if (isa<TypeDecl>(*Mem)) 2682 DK = diag::err_anonymous_record_with_type; 2683 else if (isa<FunctionDecl>(*Mem)) 2684 DK = diag::err_anonymous_record_with_function; 2685 else if (isa<VarDecl>(*Mem)) 2686 DK = diag::err_anonymous_record_with_static; 2687 2688 // Visual C++ allows type definition in anonymous struct or union. 2689 if (getLangOptions().MicrosoftExt && 2690 DK == diag::err_anonymous_record_with_type) 2691 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2692 << (int)Record->isUnion(); 2693 else { 2694 Diag((*Mem)->getLocation(), DK) 2695 << (int)Record->isUnion(); 2696 Invalid = true; 2697 } 2698 } 2699 } 2700 } 2701 2702 if (!Record->isUnion() && !Owner->isRecord()) { 2703 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2704 << (int)getLangOptions().CPlusPlus; 2705 Invalid = true; 2706 } 2707 2708 // Mock up a declarator. 2709 Declarator Dc(DS, Declarator::MemberContext); 2710 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2711 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2712 2713 // Create a declaration for this anonymous struct/union. 2714 NamedDecl *Anon = 0; 2715 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2716 Anon = FieldDecl::Create(Context, OwningClass, 2717 DS.getSourceRange().getBegin(), 2718 Record->getLocation(), 2719 /*IdentifierInfo=*/0, 2720 Context.getTypeDeclType(Record), 2721 TInfo, 2722 /*BitWidth=*/0, /*Mutable=*/false, 2723 /*HasInit=*/false); 2724 Anon->setAccess(AS); 2725 if (getLangOptions().CPlusPlus) 2726 FieldCollector->Add(cast<FieldDecl>(Anon)); 2727 } else { 2728 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2729 assert(SCSpec != DeclSpec::SCS_typedef && 2730 "Parser allowed 'typedef' as storage class VarDecl."); 2731 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2732 if (SCSpec == DeclSpec::SCS_mutable) { 2733 // mutable can only appear on non-static class members, so it's always 2734 // an error here 2735 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2736 Invalid = true; 2737 SC = SC_None; 2738 } 2739 SCSpec = DS.getStorageClassSpecAsWritten(); 2740 VarDecl::StorageClass SCAsWritten 2741 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2742 2743 Anon = VarDecl::Create(Context, Owner, 2744 DS.getSourceRange().getBegin(), 2745 Record->getLocation(), /*IdentifierInfo=*/0, 2746 Context.getTypeDeclType(Record), 2747 TInfo, SC, SCAsWritten); 2748 2749 // Default-initialize the implicit variable. This initialization will be 2750 // trivial in almost all cases, except if a union member has an in-class 2751 // initializer: 2752 // union { int n = 0; }; 2753 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2754 } 2755 Anon->setImplicit(); 2756 2757 // Add the anonymous struct/union object to the current 2758 // context. We'll be referencing this object when we refer to one of 2759 // its members. 2760 Owner->addDecl(Anon); 2761 2762 // Inject the members of the anonymous struct/union into the owning 2763 // context and into the identifier resolver chain for name lookup 2764 // purposes. 2765 SmallVector<NamedDecl*, 2> Chain; 2766 Chain.push_back(Anon); 2767 2768 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2769 Chain, false)) 2770 Invalid = true; 2771 2772 // Mark this as an anonymous struct/union type. Note that we do not 2773 // do this until after we have already checked and injected the 2774 // members of this anonymous struct/union type, because otherwise 2775 // the members could be injected twice: once by DeclContext when it 2776 // builds its lookup table, and once by 2777 // InjectAnonymousStructOrUnionMembers. 2778 Record->setAnonymousStructOrUnion(true); 2779 2780 if (Invalid) 2781 Anon->setInvalidDecl(); 2782 2783 return Anon; 2784} 2785 2786/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2787/// Microsoft C anonymous structure. 2788/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2789/// Example: 2790/// 2791/// struct A { int a; }; 2792/// struct B { struct A; int b; }; 2793/// 2794/// void foo() { 2795/// B var; 2796/// var.a = 3; 2797/// } 2798/// 2799Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2800 RecordDecl *Record) { 2801 2802 // If there is no Record, get the record via the typedef. 2803 if (!Record) 2804 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2805 2806 // Mock up a declarator. 2807 Declarator Dc(DS, Declarator::TypeNameContext); 2808 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2809 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2810 2811 // Create a declaration for this anonymous struct. 2812 NamedDecl* Anon = FieldDecl::Create(Context, 2813 cast<RecordDecl>(CurContext), 2814 DS.getSourceRange().getBegin(), 2815 DS.getSourceRange().getBegin(), 2816 /*IdentifierInfo=*/0, 2817 Context.getTypeDeclType(Record), 2818 TInfo, 2819 /*BitWidth=*/0, /*Mutable=*/false, 2820 /*HasInit=*/false); 2821 Anon->setImplicit(); 2822 2823 // Add the anonymous struct object to the current context. 2824 CurContext->addDecl(Anon); 2825 2826 // Inject the members of the anonymous struct into the current 2827 // context and into the identifier resolver chain for name lookup 2828 // purposes. 2829 SmallVector<NamedDecl*, 2> Chain; 2830 Chain.push_back(Anon); 2831 2832 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2833 Record->getDefinition(), 2834 AS_none, Chain, true)) 2835 Anon->setInvalidDecl(); 2836 2837 return Anon; 2838} 2839 2840/// GetNameForDeclarator - Determine the full declaration name for the 2841/// given Declarator. 2842DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2843 return GetNameFromUnqualifiedId(D.getName()); 2844} 2845 2846/// \brief Retrieves the declaration name from a parsed unqualified-id. 2847DeclarationNameInfo 2848Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2849 DeclarationNameInfo NameInfo; 2850 NameInfo.setLoc(Name.StartLocation); 2851 2852 switch (Name.getKind()) { 2853 2854 case UnqualifiedId::IK_ImplicitSelfParam: 2855 case UnqualifiedId::IK_Identifier: 2856 NameInfo.setName(Name.Identifier); 2857 NameInfo.setLoc(Name.StartLocation); 2858 return NameInfo; 2859 2860 case UnqualifiedId::IK_OperatorFunctionId: 2861 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2862 Name.OperatorFunctionId.Operator)); 2863 NameInfo.setLoc(Name.StartLocation); 2864 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2865 = Name.OperatorFunctionId.SymbolLocations[0]; 2866 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2867 = Name.EndLocation.getRawEncoding(); 2868 return NameInfo; 2869 2870 case UnqualifiedId::IK_LiteralOperatorId: 2871 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2872 Name.Identifier)); 2873 NameInfo.setLoc(Name.StartLocation); 2874 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2875 return NameInfo; 2876 2877 case UnqualifiedId::IK_ConversionFunctionId: { 2878 TypeSourceInfo *TInfo; 2879 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2880 if (Ty.isNull()) 2881 return DeclarationNameInfo(); 2882 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2883 Context.getCanonicalType(Ty))); 2884 NameInfo.setLoc(Name.StartLocation); 2885 NameInfo.setNamedTypeInfo(TInfo); 2886 return NameInfo; 2887 } 2888 2889 case UnqualifiedId::IK_ConstructorName: { 2890 TypeSourceInfo *TInfo; 2891 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2892 if (Ty.isNull()) 2893 return DeclarationNameInfo(); 2894 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2895 Context.getCanonicalType(Ty))); 2896 NameInfo.setLoc(Name.StartLocation); 2897 NameInfo.setNamedTypeInfo(TInfo); 2898 return NameInfo; 2899 } 2900 2901 case UnqualifiedId::IK_ConstructorTemplateId: { 2902 // In well-formed code, we can only have a constructor 2903 // template-id that refers to the current context, so go there 2904 // to find the actual type being constructed. 2905 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2906 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2907 return DeclarationNameInfo(); 2908 2909 // Determine the type of the class being constructed. 2910 QualType CurClassType = Context.getTypeDeclType(CurClass); 2911 2912 // FIXME: Check two things: that the template-id names the same type as 2913 // CurClassType, and that the template-id does not occur when the name 2914 // was qualified. 2915 2916 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2917 Context.getCanonicalType(CurClassType))); 2918 NameInfo.setLoc(Name.StartLocation); 2919 // FIXME: should we retrieve TypeSourceInfo? 2920 NameInfo.setNamedTypeInfo(0); 2921 return NameInfo; 2922 } 2923 2924 case UnqualifiedId::IK_DestructorName: { 2925 TypeSourceInfo *TInfo; 2926 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2927 if (Ty.isNull()) 2928 return DeclarationNameInfo(); 2929 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2930 Context.getCanonicalType(Ty))); 2931 NameInfo.setLoc(Name.StartLocation); 2932 NameInfo.setNamedTypeInfo(TInfo); 2933 return NameInfo; 2934 } 2935 2936 case UnqualifiedId::IK_TemplateId: { 2937 TemplateName TName = Name.TemplateId->Template.get(); 2938 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2939 return Context.getNameForTemplate(TName, TNameLoc); 2940 } 2941 2942 } // switch (Name.getKind()) 2943 2944 llvm_unreachable("Unknown name kind"); 2945} 2946 2947static QualType getCoreType(QualType Ty) { 2948 do { 2949 if (Ty->isPointerType() || Ty->isReferenceType()) 2950 Ty = Ty->getPointeeType(); 2951 else if (Ty->isArrayType()) 2952 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 2953 else 2954 return Ty.withoutLocalFastQualifiers(); 2955 } while (true); 2956} 2957 2958/// isNearlyMatchingFunction - Determine whether the C++ functions 2959/// Declaration and Definition are "nearly" matching. This heuristic 2960/// is used to improve diagnostics in the case where an out-of-line 2961/// function definition doesn't match any declaration within the class 2962/// or namespace. Also sets Params to the list of indices to the 2963/// parameters that differ between the declaration and the definition. 2964static bool isNearlyMatchingFunction(ASTContext &Context, 2965 FunctionDecl *Declaration, 2966 FunctionDecl *Definition, 2967 llvm::SmallVectorImpl<unsigned> &Params) { 2968 Params.clear(); 2969 if (Declaration->param_size() != Definition->param_size()) 2970 return false; 2971 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2972 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2973 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2974 2975 // The parameter types are identical 2976 if (Context.hasSameType(DefParamTy, DeclParamTy)) 2977 continue; 2978 2979 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 2980 QualType DefParamBaseTy = getCoreType(DefParamTy); 2981 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 2982 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 2983 2984 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 2985 (DeclTyName && DeclTyName == DefTyName)) 2986 Params.push_back(Idx); 2987 else // The two parameters aren't even close 2988 return false; 2989 } 2990 2991 return true; 2992} 2993 2994/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2995/// declarator needs to be rebuilt in the current instantiation. 2996/// Any bits of declarator which appear before the name are valid for 2997/// consideration here. That's specifically the type in the decl spec 2998/// and the base type in any member-pointer chunks. 2999static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3000 DeclarationName Name) { 3001 // The types we specifically need to rebuild are: 3002 // - typenames, typeofs, and decltypes 3003 // - types which will become injected class names 3004 // Of course, we also need to rebuild any type referencing such a 3005 // type. It's safest to just say "dependent", but we call out a 3006 // few cases here. 3007 3008 DeclSpec &DS = D.getMutableDeclSpec(); 3009 switch (DS.getTypeSpecType()) { 3010 case DeclSpec::TST_typename: 3011 case DeclSpec::TST_typeofType: 3012 case DeclSpec::TST_decltype: 3013 case DeclSpec::TST_underlyingType: { 3014 // Grab the type from the parser. 3015 TypeSourceInfo *TSI = 0; 3016 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3017 if (T.isNull() || !T->isDependentType()) break; 3018 3019 // Make sure there's a type source info. This isn't really much 3020 // of a waste; most dependent types should have type source info 3021 // attached already. 3022 if (!TSI) 3023 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3024 3025 // Rebuild the type in the current instantiation. 3026 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3027 if (!TSI) return true; 3028 3029 // Store the new type back in the decl spec. 3030 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3031 DS.UpdateTypeRep(LocType); 3032 break; 3033 } 3034 3035 case DeclSpec::TST_typeofExpr: { 3036 Expr *E = DS.getRepAsExpr(); 3037 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3038 if (Result.isInvalid()) return true; 3039 DS.UpdateExprRep(Result.get()); 3040 break; 3041 } 3042 3043 default: 3044 // Nothing to do for these decl specs. 3045 break; 3046 } 3047 3048 // It doesn't matter what order we do this in. 3049 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3050 DeclaratorChunk &Chunk = D.getTypeObject(I); 3051 3052 // The only type information in the declarator which can come 3053 // before the declaration name is the base type of a member 3054 // pointer. 3055 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3056 continue; 3057 3058 // Rebuild the scope specifier in-place. 3059 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3060 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3061 return true; 3062 } 3063 3064 return false; 3065} 3066 3067Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3068 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 3069 /*IsFunctionDefinition=*/false); 3070} 3071 3072/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3073/// If T is the name of a class, then each of the following shall have a 3074/// name different from T: 3075/// - every static data member of class T; 3076/// - every member function of class T 3077/// - every member of class T that is itself a type; 3078/// \returns true if the declaration name violates these rules. 3079bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3080 DeclarationNameInfo NameInfo) { 3081 DeclarationName Name = NameInfo.getName(); 3082 3083 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3084 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3085 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3086 return true; 3087 } 3088 3089 return false; 3090} 3091 3092Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3093 MultiTemplateParamsArg TemplateParamLists, 3094 bool IsFunctionDefinition) { 3095 // TODO: consider using NameInfo for diagnostic. 3096 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3097 DeclarationName Name = NameInfo.getName(); 3098 3099 // All of these full declarators require an identifier. If it doesn't have 3100 // one, the ParsedFreeStandingDeclSpec action should be used. 3101 if (!Name) { 3102 if (!D.isInvalidType()) // Reject this if we think it is valid. 3103 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3104 diag::err_declarator_need_ident) 3105 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3106 return 0; 3107 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3108 return 0; 3109 3110 // The scope passed in may not be a decl scope. Zip up the scope tree until 3111 // we find one that is. 3112 while ((S->getFlags() & Scope::DeclScope) == 0 || 3113 (S->getFlags() & Scope::TemplateParamScope) != 0) 3114 S = S->getParent(); 3115 3116 DeclContext *DC = CurContext; 3117 if (D.getCXXScopeSpec().isInvalid()) 3118 D.setInvalidType(); 3119 else if (D.getCXXScopeSpec().isSet()) { 3120 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3121 UPPC_DeclarationQualifier)) 3122 return 0; 3123 3124 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3125 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3126 if (!DC) { 3127 // If we could not compute the declaration context, it's because the 3128 // declaration context is dependent but does not refer to a class, 3129 // class template, or class template partial specialization. Complain 3130 // and return early, to avoid the coming semantic disaster. 3131 Diag(D.getIdentifierLoc(), 3132 diag::err_template_qualified_declarator_no_match) 3133 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3134 << D.getCXXScopeSpec().getRange(); 3135 return 0; 3136 } 3137 bool IsDependentContext = DC->isDependentContext(); 3138 3139 if (!IsDependentContext && 3140 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3141 return 0; 3142 3143 if (isa<CXXRecordDecl>(DC)) { 3144 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3145 Diag(D.getIdentifierLoc(), 3146 diag::err_member_def_undefined_record) 3147 << Name << DC << D.getCXXScopeSpec().getRange(); 3148 D.setInvalidType(); 3149 } else if (isa<CXXRecordDecl>(CurContext) && 3150 !D.getDeclSpec().isFriendSpecified()) { 3151 // The user provided a superfluous scope specifier inside a class 3152 // definition: 3153 // 3154 // class X { 3155 // void X::f(); 3156 // }; 3157 if (CurContext->Equals(DC)) 3158 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3159 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3160 else 3161 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3162 << Name << D.getCXXScopeSpec().getRange(); 3163 3164 // Pretend that this qualifier was not here. 3165 D.getCXXScopeSpec().clear(); 3166 } 3167 } 3168 3169 // Check whether we need to rebuild the type of the given 3170 // declaration in the current instantiation. 3171 if (EnteringContext && IsDependentContext && 3172 TemplateParamLists.size() != 0) { 3173 ContextRAII SavedContext(*this, DC); 3174 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3175 D.setInvalidType(); 3176 } 3177 } 3178 3179 if (DiagnoseClassNameShadow(DC, NameInfo)) 3180 // If this is a typedef, we'll end up spewing multiple diagnostics. 3181 // Just return early; it's safer. 3182 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3183 return 0; 3184 3185 NamedDecl *New; 3186 3187 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3188 QualType R = TInfo->getType(); 3189 3190 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3191 UPPC_DeclarationType)) 3192 D.setInvalidType(); 3193 3194 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3195 ForRedeclaration); 3196 3197 // See if this is a redefinition of a variable in the same scope. 3198 if (!D.getCXXScopeSpec().isSet()) { 3199 bool IsLinkageLookup = false; 3200 3201 // If the declaration we're planning to build will be a function 3202 // or object with linkage, then look for another declaration with 3203 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3204 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3205 /* Do nothing*/; 3206 else if (R->isFunctionType()) { 3207 if (CurContext->isFunctionOrMethod() || 3208 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3209 IsLinkageLookup = true; 3210 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3211 IsLinkageLookup = true; 3212 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3213 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3214 IsLinkageLookup = true; 3215 3216 if (IsLinkageLookup) 3217 Previous.clear(LookupRedeclarationWithLinkage); 3218 3219 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3220 } else { // Something like "int foo::x;" 3221 LookupQualifiedName(Previous, DC); 3222 3223 // Don't consider using declarations as previous declarations for 3224 // out-of-line members. 3225 RemoveUsingDecls(Previous); 3226 3227 // C++ 7.3.1.2p2: 3228 // Members (including explicit specializations of templates) of a named 3229 // namespace can also be defined outside that namespace by explicit 3230 // qualification of the name being defined, provided that the entity being 3231 // defined was already declared in the namespace and the definition appears 3232 // after the point of declaration in a namespace that encloses the 3233 // declarations namespace. 3234 // 3235 // Note that we only check the context at this point. We don't yet 3236 // have enough information to make sure that PrevDecl is actually 3237 // the declaration we want to match. For example, given: 3238 // 3239 // class X { 3240 // void f(); 3241 // void f(float); 3242 // }; 3243 // 3244 // void X::f(int) { } // ill-formed 3245 // 3246 // In this case, PrevDecl will point to the overload set 3247 // containing the two f's declared in X, but neither of them 3248 // matches. 3249 3250 // First check whether we named the global scope. 3251 if (isa<TranslationUnitDecl>(DC)) { 3252 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3253 << Name << D.getCXXScopeSpec().getRange(); 3254 } else { 3255 DeclContext *Cur = CurContext; 3256 while (isa<LinkageSpecDecl>(Cur)) 3257 Cur = Cur->getParent(); 3258 if (!Cur->Encloses(DC)) { 3259 // The qualifying scope doesn't enclose the original declaration. 3260 // Emit diagnostic based on current scope. 3261 SourceLocation L = D.getIdentifierLoc(); 3262 SourceRange R = D.getCXXScopeSpec().getRange(); 3263 if (isa<FunctionDecl>(Cur)) 3264 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3265 else 3266 Diag(L, diag::err_invalid_declarator_scope) 3267 << Name << cast<NamedDecl>(DC) << R; 3268 D.setInvalidType(); 3269 } 3270 } 3271 } 3272 3273 if (Previous.isSingleResult() && 3274 Previous.getFoundDecl()->isTemplateParameter()) { 3275 // Maybe we will complain about the shadowed template parameter. 3276 if (!D.isInvalidType()) 3277 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3278 Previous.getFoundDecl())) 3279 D.setInvalidType(); 3280 3281 // Just pretend that we didn't see the previous declaration. 3282 Previous.clear(); 3283 } 3284 3285 // In C++, the previous declaration we find might be a tag type 3286 // (class or enum). In this case, the new declaration will hide the 3287 // tag type. Note that this does does not apply if we're declaring a 3288 // typedef (C++ [dcl.typedef]p4). 3289 if (Previous.isSingleTagDecl() && 3290 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3291 Previous.clear(); 3292 3293 bool Redeclaration = false; 3294 bool AddToScope = true; 3295 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3296 if (TemplateParamLists.size()) { 3297 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3298 return 0; 3299 } 3300 3301 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3302 } else if (R->isFunctionType()) { 3303 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3304 move(TemplateParamLists), 3305 IsFunctionDefinition, Redeclaration, 3306 AddToScope); 3307 } else { 3308 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3309 move(TemplateParamLists), 3310 Redeclaration); 3311 } 3312 3313 if (New == 0) 3314 return 0; 3315 3316 // If this has an identifier and is not an invalid redeclaration or 3317 // function template specialization, add it to the scope stack. 3318 if (New->getDeclName() && AddToScope && 3319 !(Redeclaration && New->isInvalidDecl())) 3320 PushOnScopeChains(New, S); 3321 3322 return New; 3323} 3324 3325/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3326/// types into constant array types in certain situations which would otherwise 3327/// be errors (for GCC compatibility). 3328static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3329 ASTContext &Context, 3330 bool &SizeIsNegative, 3331 llvm::APSInt &Oversized) { 3332 // This method tries to turn a variable array into a constant 3333 // array even when the size isn't an ICE. This is necessary 3334 // for compatibility with code that depends on gcc's buggy 3335 // constant expression folding, like struct {char x[(int)(char*)2];} 3336 SizeIsNegative = false; 3337 Oversized = 0; 3338 3339 if (T->isDependentType()) 3340 return QualType(); 3341 3342 QualifierCollector Qs; 3343 const Type *Ty = Qs.strip(T); 3344 3345 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3346 QualType Pointee = PTy->getPointeeType(); 3347 QualType FixedType = 3348 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3349 Oversized); 3350 if (FixedType.isNull()) return FixedType; 3351 FixedType = Context.getPointerType(FixedType); 3352 return Qs.apply(Context, FixedType); 3353 } 3354 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3355 QualType Inner = PTy->getInnerType(); 3356 QualType FixedType = 3357 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3358 Oversized); 3359 if (FixedType.isNull()) return FixedType; 3360 FixedType = Context.getParenType(FixedType); 3361 return Qs.apply(Context, FixedType); 3362 } 3363 3364 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3365 if (!VLATy) 3366 return QualType(); 3367 // FIXME: We should probably handle this case 3368 if (VLATy->getElementType()->isVariablyModifiedType()) 3369 return QualType(); 3370 3371 Expr::EvalResult EvalResult; 3372 if (!VLATy->getSizeExpr() || 3373 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3374 !EvalResult.Val.isInt()) 3375 return QualType(); 3376 3377 // Check whether the array size is negative. 3378 llvm::APSInt &Res = EvalResult.Val.getInt(); 3379 if (Res.isSigned() && Res.isNegative()) { 3380 SizeIsNegative = true; 3381 return QualType(); 3382 } 3383 3384 // Check whether the array is too large to be addressed. 3385 unsigned ActiveSizeBits 3386 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3387 Res); 3388 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3389 Oversized = Res; 3390 return QualType(); 3391 } 3392 3393 return Context.getConstantArrayType(VLATy->getElementType(), 3394 Res, ArrayType::Normal, 0); 3395} 3396 3397/// \brief Register the given locally-scoped external C declaration so 3398/// that it can be found later for redeclarations 3399void 3400Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3401 const LookupResult &Previous, 3402 Scope *S) { 3403 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3404 "Decl is not a locally-scoped decl!"); 3405 // Note that we have a locally-scoped external with this name. 3406 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3407 3408 if (!Previous.isSingleResult()) 3409 return; 3410 3411 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3412 3413 // If there was a previous declaration of this variable, it may be 3414 // in our identifier chain. Update the identifier chain with the new 3415 // declaration. 3416 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3417 // The previous declaration was found on the identifer resolver 3418 // chain, so remove it from its scope. 3419 3420 if (S->isDeclScope(PrevDecl)) { 3421 // Special case for redeclarations in the SAME scope. 3422 // Because this declaration is going to be added to the identifier chain 3423 // later, we should temporarily take it OFF the chain. 3424 IdResolver.RemoveDecl(ND); 3425 3426 } else { 3427 // Find the scope for the original declaration. 3428 while (S && !S->isDeclScope(PrevDecl)) 3429 S = S->getParent(); 3430 } 3431 3432 if (S) 3433 S->RemoveDecl(PrevDecl); 3434 } 3435} 3436 3437llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3438Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3439 if (ExternalSource) { 3440 // Load locally-scoped external decls from the external source. 3441 SmallVector<NamedDecl *, 4> Decls; 3442 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3443 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3444 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3445 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3446 if (Pos == LocallyScopedExternalDecls.end()) 3447 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3448 } 3449 } 3450 3451 return LocallyScopedExternalDecls.find(Name); 3452} 3453 3454/// \brief Diagnose function specifiers on a declaration of an identifier that 3455/// does not identify a function. 3456void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3457 // FIXME: We should probably indicate the identifier in question to avoid 3458 // confusion for constructs like "inline int a(), b;" 3459 if (D.getDeclSpec().isInlineSpecified()) 3460 Diag(D.getDeclSpec().getInlineSpecLoc(), 3461 diag::err_inline_non_function); 3462 3463 if (D.getDeclSpec().isVirtualSpecified()) 3464 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3465 diag::err_virtual_non_function); 3466 3467 if (D.getDeclSpec().isExplicitSpecified()) 3468 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3469 diag::err_explicit_non_function); 3470} 3471 3472NamedDecl* 3473Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3474 QualType R, TypeSourceInfo *TInfo, 3475 LookupResult &Previous, bool &Redeclaration) { 3476 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3477 if (D.getCXXScopeSpec().isSet()) { 3478 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3479 << D.getCXXScopeSpec().getRange(); 3480 D.setInvalidType(); 3481 // Pretend we didn't see the scope specifier. 3482 DC = CurContext; 3483 Previous.clear(); 3484 } 3485 3486 if (getLangOptions().CPlusPlus) { 3487 // Check that there are no default arguments (C++ only). 3488 CheckExtraCXXDefaultArguments(D); 3489 } 3490 3491 DiagnoseFunctionSpecifiers(D); 3492 3493 if (D.getDeclSpec().isThreadSpecified()) 3494 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3495 if (D.getDeclSpec().isConstexprSpecified()) 3496 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3497 << 1; 3498 3499 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3500 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3501 << D.getName().getSourceRange(); 3502 return 0; 3503 } 3504 3505 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3506 if (!NewTD) return 0; 3507 3508 // Handle attributes prior to checking for duplicates in MergeVarDecl 3509 ProcessDeclAttributes(S, NewTD, D); 3510 3511 CheckTypedefForVariablyModifiedType(S, NewTD); 3512 3513 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3514} 3515 3516void 3517Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3518 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3519 // then it shall have block scope. 3520 // Note that variably modified types must be fixed before merging the decl so 3521 // that redeclarations will match. 3522 QualType T = NewTD->getUnderlyingType(); 3523 if (T->isVariablyModifiedType()) { 3524 getCurFunction()->setHasBranchProtectedScope(); 3525 3526 if (S->getFnParent() == 0) { 3527 bool SizeIsNegative; 3528 llvm::APSInt Oversized; 3529 QualType FixedTy = 3530 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3531 Oversized); 3532 if (!FixedTy.isNull()) { 3533 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3534 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3535 } else { 3536 if (SizeIsNegative) 3537 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3538 else if (T->isVariableArrayType()) 3539 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3540 else if (Oversized.getBoolValue()) 3541 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3542 else 3543 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3544 NewTD->setInvalidDecl(); 3545 } 3546 } 3547 } 3548} 3549 3550 3551/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3552/// declares a typedef-name, either using the 'typedef' type specifier or via 3553/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3554NamedDecl* 3555Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3556 LookupResult &Previous, bool &Redeclaration) { 3557 // Merge the decl with the existing one if appropriate. If the decl is 3558 // in an outer scope, it isn't the same thing. 3559 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3560 /*ExplicitInstantiationOrSpecialization=*/false); 3561 if (!Previous.empty()) { 3562 Redeclaration = true; 3563 MergeTypedefNameDecl(NewTD, Previous); 3564 } 3565 3566 // If this is the C FILE type, notify the AST context. 3567 if (IdentifierInfo *II = NewTD->getIdentifier()) 3568 if (!NewTD->isInvalidDecl() && 3569 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3570 if (II->isStr("FILE")) 3571 Context.setFILEDecl(NewTD); 3572 else if (II->isStr("jmp_buf")) 3573 Context.setjmp_bufDecl(NewTD); 3574 else if (II->isStr("sigjmp_buf")) 3575 Context.setsigjmp_bufDecl(NewTD); 3576 else if (II->isStr("__builtin_va_list")) 3577 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3578 } 3579 3580 return NewTD; 3581} 3582 3583/// \brief Determines whether the given declaration is an out-of-scope 3584/// previous declaration. 3585/// 3586/// This routine should be invoked when name lookup has found a 3587/// previous declaration (PrevDecl) that is not in the scope where a 3588/// new declaration by the same name is being introduced. If the new 3589/// declaration occurs in a local scope, previous declarations with 3590/// linkage may still be considered previous declarations (C99 3591/// 6.2.2p4-5, C++ [basic.link]p6). 3592/// 3593/// \param PrevDecl the previous declaration found by name 3594/// lookup 3595/// 3596/// \param DC the context in which the new declaration is being 3597/// declared. 3598/// 3599/// \returns true if PrevDecl is an out-of-scope previous declaration 3600/// for a new delcaration with the same name. 3601static bool 3602isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3603 ASTContext &Context) { 3604 if (!PrevDecl) 3605 return false; 3606 3607 if (!PrevDecl->hasLinkage()) 3608 return false; 3609 3610 if (Context.getLangOptions().CPlusPlus) { 3611 // C++ [basic.link]p6: 3612 // If there is a visible declaration of an entity with linkage 3613 // having the same name and type, ignoring entities declared 3614 // outside the innermost enclosing namespace scope, the block 3615 // scope declaration declares that same entity and receives the 3616 // linkage of the previous declaration. 3617 DeclContext *OuterContext = DC->getRedeclContext(); 3618 if (!OuterContext->isFunctionOrMethod()) 3619 // This rule only applies to block-scope declarations. 3620 return false; 3621 3622 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3623 if (PrevOuterContext->isRecord()) 3624 // We found a member function: ignore it. 3625 return false; 3626 3627 // Find the innermost enclosing namespace for the new and 3628 // previous declarations. 3629 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3630 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3631 3632 // The previous declaration is in a different namespace, so it 3633 // isn't the same function. 3634 if (!OuterContext->Equals(PrevOuterContext)) 3635 return false; 3636 } 3637 3638 return true; 3639} 3640 3641static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3642 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3643 if (!SS.isSet()) return; 3644 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3645} 3646 3647bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3648 QualType type = decl->getType(); 3649 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3650 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3651 // Various kinds of declaration aren't allowed to be __autoreleasing. 3652 unsigned kind = -1U; 3653 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3654 if (var->hasAttr<BlocksAttr>()) 3655 kind = 0; // __block 3656 else if (!var->hasLocalStorage()) 3657 kind = 1; // global 3658 } else if (isa<ObjCIvarDecl>(decl)) { 3659 kind = 3; // ivar 3660 } else if (isa<FieldDecl>(decl)) { 3661 kind = 2; // field 3662 } 3663 3664 if (kind != -1U) { 3665 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3666 << kind; 3667 } 3668 } else if (lifetime == Qualifiers::OCL_None) { 3669 // Try to infer lifetime. 3670 if (!type->isObjCLifetimeType()) 3671 return false; 3672 3673 lifetime = type->getObjCARCImplicitLifetime(); 3674 type = Context.getLifetimeQualifiedType(type, lifetime); 3675 decl->setType(type); 3676 } 3677 3678 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3679 // Thread-local variables cannot have lifetime. 3680 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3681 var->isThreadSpecified()) { 3682 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3683 << var->getType(); 3684 return true; 3685 } 3686 } 3687 3688 return false; 3689} 3690 3691NamedDecl* 3692Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3693 QualType R, TypeSourceInfo *TInfo, 3694 LookupResult &Previous, 3695 MultiTemplateParamsArg TemplateParamLists, 3696 bool &Redeclaration) { 3697 DeclarationName Name = GetNameForDeclarator(D).getName(); 3698 3699 // Check that there are no default arguments (C++ only). 3700 if (getLangOptions().CPlusPlus) 3701 CheckExtraCXXDefaultArguments(D); 3702 3703 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3704 assert(SCSpec != DeclSpec::SCS_typedef && 3705 "Parser allowed 'typedef' as storage class VarDecl."); 3706 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3707 if (SCSpec == DeclSpec::SCS_mutable) { 3708 // mutable can only appear on non-static class members, so it's always 3709 // an error here 3710 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3711 D.setInvalidType(); 3712 SC = SC_None; 3713 } 3714 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3715 VarDecl::StorageClass SCAsWritten 3716 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3717 3718 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3719 if (!II) { 3720 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3721 << Name.getAsString(); 3722 return 0; 3723 } 3724 3725 DiagnoseFunctionSpecifiers(D); 3726 3727 if (!DC->isRecord() && S->getFnParent() == 0) { 3728 // C99 6.9p2: The storage-class specifiers auto and register shall not 3729 // appear in the declaration specifiers in an external declaration. 3730 if (SC == SC_Auto || SC == SC_Register) { 3731 3732 // If this is a register variable with an asm label specified, then this 3733 // is a GNU extension. 3734 if (SC == SC_Register && D.getAsmLabel()) 3735 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3736 else 3737 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3738 D.setInvalidType(); 3739 } 3740 } 3741 3742 if (getLangOptions().OpenCL) { 3743 // Set up the special work-group-local storage class for variables in the 3744 // OpenCL __local address space. 3745 if (R.getAddressSpace() == LangAS::opencl_local) 3746 SC = SC_OpenCLWorkGroupLocal; 3747 } 3748 3749 bool isExplicitSpecialization = false; 3750 VarDecl *NewVD; 3751 if (!getLangOptions().CPlusPlus) { 3752 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3753 D.getIdentifierLoc(), II, 3754 R, TInfo, SC, SCAsWritten); 3755 3756 if (D.isInvalidType()) 3757 NewVD->setInvalidDecl(); 3758 } else { 3759 if (DC->isRecord() && !CurContext->isRecord()) { 3760 // This is an out-of-line definition of a static data member. 3761 if (SC == SC_Static) { 3762 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3763 diag::err_static_out_of_line) 3764 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3765 } else if (SC == SC_None) 3766 SC = SC_Static; 3767 } 3768 if (SC == SC_Static) { 3769 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3770 if (RD->isLocalClass()) 3771 Diag(D.getIdentifierLoc(), 3772 diag::err_static_data_member_not_allowed_in_local_class) 3773 << Name << RD->getDeclName(); 3774 3775 // C++ [class.union]p1: If a union contains a static data member, 3776 // the program is ill-formed. 3777 // 3778 // We also disallow static data members in anonymous structs. 3779 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3780 Diag(D.getIdentifierLoc(), 3781 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3782 << Name << RD->isUnion(); 3783 } 3784 } 3785 3786 // Match up the template parameter lists with the scope specifier, then 3787 // determine whether we have a template or a template specialization. 3788 isExplicitSpecialization = false; 3789 bool Invalid = false; 3790 if (TemplateParameterList *TemplateParams 3791 = MatchTemplateParametersToScopeSpecifier( 3792 D.getDeclSpec().getSourceRange().getBegin(), 3793 D.getIdentifierLoc(), 3794 D.getCXXScopeSpec(), 3795 TemplateParamLists.get(), 3796 TemplateParamLists.size(), 3797 /*never a friend*/ false, 3798 isExplicitSpecialization, 3799 Invalid)) { 3800 if (TemplateParams->size() > 0) { 3801 // There is no such thing as a variable template. 3802 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3803 << II 3804 << SourceRange(TemplateParams->getTemplateLoc(), 3805 TemplateParams->getRAngleLoc()); 3806 return 0; 3807 } else { 3808 // There is an extraneous 'template<>' for this variable. Complain 3809 // about it, but allow the declaration of the variable. 3810 Diag(TemplateParams->getTemplateLoc(), 3811 diag::err_template_variable_noparams) 3812 << II 3813 << SourceRange(TemplateParams->getTemplateLoc(), 3814 TemplateParams->getRAngleLoc()); 3815 } 3816 } 3817 3818 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3819 D.getIdentifierLoc(), II, 3820 R, TInfo, SC, SCAsWritten); 3821 3822 // If this decl has an auto type in need of deduction, make a note of the 3823 // Decl so we can diagnose uses of it in its own initializer. 3824 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3825 R->getContainedAutoType()) 3826 ParsingInitForAutoVars.insert(NewVD); 3827 3828 if (D.isInvalidType() || Invalid) 3829 NewVD->setInvalidDecl(); 3830 3831 SetNestedNameSpecifier(NewVD, D); 3832 3833 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3834 NewVD->setTemplateParameterListsInfo(Context, 3835 TemplateParamLists.size(), 3836 TemplateParamLists.release()); 3837 } 3838 3839 if (D.getDeclSpec().isConstexprSpecified()) { 3840 // FIXME: once we know whether there's an initializer, apply this to 3841 // static data members too. 3842 if (!NewVD->isStaticDataMember() && 3843 !NewVD->isThisDeclarationADefinition()) { 3844 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3845 // of a variable. Suggest replacing it with 'const' if appropriate. 3846 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3847 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3848 // If the declarator is complex, we need to move the keyword to the 3849 // innermost chunk as we switch it from 'constexpr' to 'const'. 3850 int Kind = DeclaratorChunk::Paren; 3851 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3852 Kind = D.getTypeObject(I).Kind; 3853 if (Kind != DeclaratorChunk::Paren) 3854 break; 3855 } 3856 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3857 Kind == DeclaratorChunk::Reference) 3858 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3859 << FixItHint::CreateRemoval(ConstexprRange); 3860 else if (Kind == DeclaratorChunk::Paren) 3861 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3862 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3863 else 3864 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3865 << FixItHint::CreateRemoval(ConstexprRange) 3866 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3867 } else { 3868 NewVD->setConstexpr(true); 3869 } 3870 } 3871 } 3872 3873 // Set the lexical context. If the declarator has a C++ scope specifier, the 3874 // lexical context will be different from the semantic context. 3875 NewVD->setLexicalDeclContext(CurContext); 3876 3877 if (D.getDeclSpec().isThreadSpecified()) { 3878 if (NewVD->hasLocalStorage()) 3879 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3880 else if (!Context.getTargetInfo().isTLSSupported()) 3881 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3882 else 3883 NewVD->setThreadSpecified(true); 3884 } 3885 3886 if (D.getDeclSpec().isModulePrivateSpecified()) { 3887 if (isExplicitSpecialization) 3888 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3889 << 2 3890 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3891 else if (NewVD->hasLocalStorage()) 3892 Diag(NewVD->getLocation(), diag::err_module_private_local) 3893 << 0 << NewVD->getDeclName() 3894 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3895 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3896 else 3897 NewVD->setModulePrivate(); 3898 } 3899 3900 // Handle attributes prior to checking for duplicates in MergeVarDecl 3901 ProcessDeclAttributes(S, NewVD, D); 3902 3903 // In auto-retain/release, infer strong retension for variables of 3904 // retainable type. 3905 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3906 NewVD->setInvalidDecl(); 3907 3908 // Handle GNU asm-label extension (encoded as an attribute). 3909 if (Expr *E = (Expr*)D.getAsmLabel()) { 3910 // The parser guarantees this is a string. 3911 StringLiteral *SE = cast<StringLiteral>(E); 3912 StringRef Label = SE->getString(); 3913 if (S->getFnParent() != 0) { 3914 switch (SC) { 3915 case SC_None: 3916 case SC_Auto: 3917 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3918 break; 3919 case SC_Register: 3920 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3921 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3922 break; 3923 case SC_Static: 3924 case SC_Extern: 3925 case SC_PrivateExtern: 3926 case SC_OpenCLWorkGroupLocal: 3927 break; 3928 } 3929 } 3930 3931 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3932 Context, Label)); 3933 } 3934 3935 // Diagnose shadowed variables before filtering for scope. 3936 if (!D.getCXXScopeSpec().isSet()) 3937 CheckShadow(S, NewVD, Previous); 3938 3939 // Don't consider existing declarations that are in a different 3940 // scope and are out-of-semantic-context declarations (if the new 3941 // declaration has linkage). 3942 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3943 isExplicitSpecialization); 3944 3945 if (!getLangOptions().CPlusPlus) 3946 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3947 else { 3948 // Merge the decl with the existing one if appropriate. 3949 if (!Previous.empty()) { 3950 if (Previous.isSingleResult() && 3951 isa<FieldDecl>(Previous.getFoundDecl()) && 3952 D.getCXXScopeSpec().isSet()) { 3953 // The user tried to define a non-static data member 3954 // out-of-line (C++ [dcl.meaning]p1). 3955 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3956 << D.getCXXScopeSpec().getRange(); 3957 Previous.clear(); 3958 NewVD->setInvalidDecl(); 3959 } 3960 } else if (D.getCXXScopeSpec().isSet()) { 3961 // No previous declaration in the qualifying scope. 3962 Diag(D.getIdentifierLoc(), diag::err_no_member) 3963 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3964 << D.getCXXScopeSpec().getRange(); 3965 NewVD->setInvalidDecl(); 3966 } 3967 3968 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3969 3970 // This is an explicit specialization of a static data member. Check it. 3971 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3972 CheckMemberSpecialization(NewVD, Previous)) 3973 NewVD->setInvalidDecl(); 3974 } 3975 3976 // attributes declared post-definition are currently ignored 3977 // FIXME: This should be handled in attribute merging, not 3978 // here. 3979 if (Previous.isSingleResult()) { 3980 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3981 if (Def && (Def = Def->getDefinition()) && 3982 Def != NewVD && D.hasAttributes()) { 3983 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3984 Diag(Def->getLocation(), diag::note_previous_definition); 3985 } 3986 } 3987 3988 // If this is a locally-scoped extern C variable, update the map of 3989 // such variables. 3990 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3991 !NewVD->isInvalidDecl()) 3992 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3993 3994 // If there's a #pragma GCC visibility in scope, and this isn't a class 3995 // member, set the visibility of this variable. 3996 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3997 AddPushedVisibilityAttribute(NewVD); 3998 3999 MarkUnusedFileScopedDecl(NewVD); 4000 4001 return NewVD; 4002} 4003 4004/// \brief Diagnose variable or built-in function shadowing. Implements 4005/// -Wshadow. 4006/// 4007/// This method is called whenever a VarDecl is added to a "useful" 4008/// scope. 4009/// 4010/// \param S the scope in which the shadowing name is being declared 4011/// \param R the lookup of the name 4012/// 4013void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4014 // Return if warning is ignored. 4015 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4016 DiagnosticsEngine::Ignored) 4017 return; 4018 4019 // Don't diagnose declarations at file scope. 4020 if (D->hasGlobalStorage()) 4021 return; 4022 4023 DeclContext *NewDC = D->getDeclContext(); 4024 4025 // Only diagnose if we're shadowing an unambiguous field or variable. 4026 if (R.getResultKind() != LookupResult::Found) 4027 return; 4028 4029 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4030 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4031 return; 4032 4033 // Fields are not shadowed by variables in C++ static methods. 4034 if (isa<FieldDecl>(ShadowedDecl)) 4035 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4036 if (MD->isStatic()) 4037 return; 4038 4039 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4040 if (shadowedVar->isExternC()) { 4041 // For shadowing external vars, make sure that we point to the global 4042 // declaration, not a locally scoped extern declaration. 4043 for (VarDecl::redecl_iterator 4044 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4045 I != E; ++I) 4046 if (I->isFileVarDecl()) { 4047 ShadowedDecl = *I; 4048 break; 4049 } 4050 } 4051 4052 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4053 4054 // Only warn about certain kinds of shadowing for class members. 4055 if (NewDC && NewDC->isRecord()) { 4056 // In particular, don't warn about shadowing non-class members. 4057 if (!OldDC->isRecord()) 4058 return; 4059 4060 // TODO: should we warn about static data members shadowing 4061 // static data members from base classes? 4062 4063 // TODO: don't diagnose for inaccessible shadowed members. 4064 // This is hard to do perfectly because we might friend the 4065 // shadowing context, but that's just a false negative. 4066 } 4067 4068 // Determine what kind of declaration we're shadowing. 4069 unsigned Kind; 4070 if (isa<RecordDecl>(OldDC)) { 4071 if (isa<FieldDecl>(ShadowedDecl)) 4072 Kind = 3; // field 4073 else 4074 Kind = 2; // static data member 4075 } else if (OldDC->isFileContext()) 4076 Kind = 1; // global 4077 else 4078 Kind = 0; // local 4079 4080 DeclarationName Name = R.getLookupName(); 4081 4082 // Emit warning and note. 4083 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4084 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4085} 4086 4087/// \brief Check -Wshadow without the advantage of a previous lookup. 4088void Sema::CheckShadow(Scope *S, VarDecl *D) { 4089 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4090 DiagnosticsEngine::Ignored) 4091 return; 4092 4093 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4094 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4095 LookupName(R, S); 4096 CheckShadow(S, D, R); 4097} 4098 4099/// \brief Perform semantic checking on a newly-created variable 4100/// declaration. 4101/// 4102/// This routine performs all of the type-checking required for a 4103/// variable declaration once it has been built. It is used both to 4104/// check variables after they have been parsed and their declarators 4105/// have been translated into a declaration, and to check variables 4106/// that have been instantiated from a template. 4107/// 4108/// Sets NewVD->isInvalidDecl() if an error was encountered. 4109void Sema::CheckVariableDeclaration(VarDecl *NewVD, 4110 LookupResult &Previous, 4111 bool &Redeclaration) { 4112 // If the decl is already known invalid, don't check it. 4113 if (NewVD->isInvalidDecl()) 4114 return; 4115 4116 QualType T = NewVD->getType(); 4117 4118 if (T->isObjCObjectType()) { 4119 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4120 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4121 T = Context.getObjCObjectPointerType(T); 4122 NewVD->setType(T); 4123 } 4124 4125 // Emit an error if an address space was applied to decl with local storage. 4126 // This includes arrays of objects with address space qualifiers, but not 4127 // automatic variables that point to other address spaces. 4128 // ISO/IEC TR 18037 S5.1.2 4129 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4130 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4131 return NewVD->setInvalidDecl(); 4132 } 4133 4134 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4135 && !NewVD->hasAttr<BlocksAttr>()) { 4136 if (getLangOptions().getGC() != LangOptions::NonGC) 4137 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4138 else 4139 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4140 } 4141 4142 bool isVM = T->isVariablyModifiedType(); 4143 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4144 NewVD->hasAttr<BlocksAttr>()) 4145 getCurFunction()->setHasBranchProtectedScope(); 4146 4147 if ((isVM && NewVD->hasLinkage()) || 4148 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4149 bool SizeIsNegative; 4150 llvm::APSInt Oversized; 4151 QualType FixedTy = 4152 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4153 Oversized); 4154 4155 if (FixedTy.isNull() && T->isVariableArrayType()) { 4156 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4157 // FIXME: This won't give the correct result for 4158 // int a[10][n]; 4159 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4160 4161 if (NewVD->isFileVarDecl()) 4162 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4163 << SizeRange; 4164 else if (NewVD->getStorageClass() == SC_Static) 4165 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4166 << SizeRange; 4167 else 4168 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4169 << SizeRange; 4170 return NewVD->setInvalidDecl(); 4171 } 4172 4173 if (FixedTy.isNull()) { 4174 if (NewVD->isFileVarDecl()) 4175 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4176 else 4177 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4178 return NewVD->setInvalidDecl(); 4179 } 4180 4181 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4182 NewVD->setType(FixedTy); 4183 } 4184 4185 if (Previous.empty() && NewVD->isExternC()) { 4186 // Since we did not find anything by this name and we're declaring 4187 // an extern "C" variable, look for a non-visible extern "C" 4188 // declaration with the same name. 4189 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4190 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4191 if (Pos != LocallyScopedExternalDecls.end()) 4192 Previous.addDecl(Pos->second); 4193 } 4194 4195 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4196 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4197 << T; 4198 return NewVD->setInvalidDecl(); 4199 } 4200 4201 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4202 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4203 return NewVD->setInvalidDecl(); 4204 } 4205 4206 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4207 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4208 return NewVD->setInvalidDecl(); 4209 } 4210 4211 // Function pointers and references cannot have qualified function type, only 4212 // function pointer-to-members can do that. 4213 QualType Pointee; 4214 unsigned PtrOrRef = 0; 4215 if (const PointerType *Ptr = T->getAs<PointerType>()) 4216 Pointee = Ptr->getPointeeType(); 4217 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4218 Pointee = Ref->getPointeeType(); 4219 PtrOrRef = 1; 4220 } 4221 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4222 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4223 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4224 << PtrOrRef; 4225 return NewVD->setInvalidDecl(); 4226 } 4227 4228 if (!Previous.empty()) { 4229 Redeclaration = true; 4230 MergeVarDecl(NewVD, Previous); 4231 } 4232} 4233 4234/// \brief Data used with FindOverriddenMethod 4235struct FindOverriddenMethodData { 4236 Sema *S; 4237 CXXMethodDecl *Method; 4238}; 4239 4240/// \brief Member lookup function that determines whether a given C++ 4241/// method overrides a method in a base class, to be used with 4242/// CXXRecordDecl::lookupInBases(). 4243static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4244 CXXBasePath &Path, 4245 void *UserData) { 4246 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4247 4248 FindOverriddenMethodData *Data 4249 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4250 4251 DeclarationName Name = Data->Method->getDeclName(); 4252 4253 // FIXME: Do we care about other names here too? 4254 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4255 // We really want to find the base class destructor here. 4256 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4257 CanQualType CT = Data->S->Context.getCanonicalType(T); 4258 4259 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4260 } 4261 4262 for (Path.Decls = BaseRecord->lookup(Name); 4263 Path.Decls.first != Path.Decls.second; 4264 ++Path.Decls.first) { 4265 NamedDecl *D = *Path.Decls.first; 4266 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4267 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4268 return true; 4269 } 4270 } 4271 4272 return false; 4273} 4274 4275/// AddOverriddenMethods - See if a method overrides any in the base classes, 4276/// and if so, check that it's a valid override and remember it. 4277bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4278 // Look for virtual methods in base classes that this method might override. 4279 CXXBasePaths Paths; 4280 FindOverriddenMethodData Data; 4281 Data.Method = MD; 4282 Data.S = this; 4283 bool AddedAny = false; 4284 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4285 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4286 E = Paths.found_decls_end(); I != E; ++I) { 4287 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4288 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4289 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4290 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4291 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4292 AddedAny = true; 4293 } 4294 } 4295 } 4296 } 4297 4298 return AddedAny; 4299} 4300 4301static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD, 4302 bool isFriendDecl) { 4303 DeclarationName Name = NewFD->getDeclName(); 4304 DeclContext *DC = NewFD->getDeclContext(); 4305 LookupResult Prev(S, Name, NewFD->getLocation(), 4306 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4307 llvm::SmallVector<unsigned, 1> MismatchedParams; 4308 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4309 TypoCorrection Correction; 4310 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4311 : diag::err_member_def_does_not_match; 4312 4313 NewFD->setInvalidDecl(); 4314 S.LookupQualifiedName(Prev, DC); 4315 assert(!Prev.isAmbiguous() && 4316 "Cannot have an ambiguity in previous-declaration lookup"); 4317 if (!Prev.empty()) { 4318 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4319 Func != FuncEnd; ++Func) { 4320 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4321 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4322 MismatchedParams)) { 4323 // Add 1 to the index so that 0 can mean the mismatch didn't 4324 // involve a parameter 4325 unsigned ParamNum = 4326 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4327 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4328 } 4329 } 4330 // If the qualified name lookup yielded nothing, try typo correction 4331 } else if ((Correction = S.CorrectTypo(Prev.getLookupNameInfo(), 4332 Prev.getLookupKind(), 0, 0, DC)) && 4333 Correction.getCorrection() != Name) { 4334 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4335 CDeclEnd = Correction.end(); 4336 CDecl != CDeclEnd; ++CDecl) { 4337 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4338 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4339 MismatchedParams)) { 4340 // Add 1 to the index so that 0 can mean the mismatch didn't 4341 // involve a parameter 4342 unsigned ParamNum = 4343 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4344 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4345 } 4346 } 4347 if (!NearMatches.empty()) 4348 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4349 : diag::err_member_def_does_not_match_suggest; 4350 } 4351 4352 // Ignore the correction if it didn't yield any close FunctionDecl matches 4353 if (Correction && NearMatches.empty()) 4354 Correction = TypoCorrection(); 4355 4356 if (Correction) 4357 S.Diag(NewFD->getLocation(), DiagMsg) 4358 << Name << DC << Correction.getQuoted(S.getLangOptions()) 4359 << FixItHint::CreateReplacement( 4360 NewFD->getLocation(), Correction.getAsString(S.getLangOptions())); 4361 else 4362 S.Diag(NewFD->getLocation(), DiagMsg) << Name << DC << NewFD->getLocation(); 4363 4364 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4365 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4366 NearMatch != NearMatchEnd; ++NearMatch) { 4367 FunctionDecl *FD = NearMatch->first; 4368 4369 if (unsigned Idx = NearMatch->second) { 4370 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4371 S.Diag(FDParam->getTypeSpecStartLoc(), 4372 diag::note_member_def_close_param_match) 4373 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4374 } else if (Correction) { 4375 S.Diag(FD->getLocation(), diag::note_previous_decl) 4376 << Correction.getQuoted(S.getLangOptions()); 4377 } else 4378 S.Diag(FD->getLocation(), diag::note_member_def_close_match); 4379 } 4380} 4381 4382NamedDecl* 4383Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4384 QualType R, TypeSourceInfo *TInfo, 4385 LookupResult &Previous, 4386 MultiTemplateParamsArg TemplateParamLists, 4387 bool IsFunctionDefinition, bool &Redeclaration, 4388 bool &AddToScope) { 4389 assert(R.getTypePtr()->isFunctionType()); 4390 4391 // TODO: consider using NameInfo for diagnostic. 4392 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4393 DeclarationName Name = NameInfo.getName(); 4394 FunctionDecl::StorageClass SC = SC_None; 4395 switch (D.getDeclSpec().getStorageClassSpec()) { 4396 default: llvm_unreachable("Unknown storage class!"); 4397 case DeclSpec::SCS_auto: 4398 case DeclSpec::SCS_register: 4399 case DeclSpec::SCS_mutable: 4400 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4401 diag::err_typecheck_sclass_func); 4402 D.setInvalidType(); 4403 break; 4404 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4405 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4406 case DeclSpec::SCS_static: { 4407 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4408 // C99 6.7.1p5: 4409 // The declaration of an identifier for a function that has 4410 // block scope shall have no explicit storage-class specifier 4411 // other than extern 4412 // See also (C++ [dcl.stc]p4). 4413 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4414 diag::err_static_block_func); 4415 SC = SC_None; 4416 } else 4417 SC = SC_Static; 4418 break; 4419 } 4420 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4421 } 4422 4423 if (D.getDeclSpec().isThreadSpecified()) 4424 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4425 4426 // Do not allow returning a objc interface by-value. 4427 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4428 Diag(D.getIdentifierLoc(), 4429 diag::err_object_cannot_be_passed_returned_by_value) << 0 4430 << R->getAs<FunctionType>()->getResultType() 4431 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4432 4433 QualType T = R->getAs<FunctionType>()->getResultType(); 4434 T = Context.getObjCObjectPointerType(T); 4435 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4436 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4437 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4438 FPT->getNumArgs(), EPI); 4439 } 4440 else if (isa<FunctionNoProtoType>(R)) 4441 R = Context.getFunctionNoProtoType(T); 4442 } 4443 4444 FunctionDecl *NewFD; 4445 bool isInline = D.getDeclSpec().isInlineSpecified(); 4446 bool isFriend = false; 4447 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4448 FunctionDecl::StorageClass SCAsWritten 4449 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4450 FunctionTemplateDecl *FunctionTemplate = 0; 4451 bool isExplicitSpecialization = false; 4452 bool isFunctionTemplateSpecialization = false; 4453 bool isDependentClassScopeExplicitSpecialization = false; 4454 4455 if (!getLangOptions().CPlusPlus) { 4456 // Determine whether the function was written with a 4457 // prototype. This true when: 4458 // - there is a prototype in the declarator, or 4459 // - the type R of the function is some kind of typedef or other reference 4460 // to a type name (which eventually refers to a function type). 4461 bool HasPrototype = 4462 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4463 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4464 4465 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4466 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4467 HasPrototype); 4468 if (D.isInvalidType()) 4469 NewFD->setInvalidDecl(); 4470 4471 // Set the lexical context. 4472 NewFD->setLexicalDeclContext(CurContext); 4473 // Filter out previous declarations that don't match the scope. 4474 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4475 /*ExplicitInstantiationOrSpecialization=*/false); 4476 } else { 4477 isFriend = D.getDeclSpec().isFriendSpecified(); 4478 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4479 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4480 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4481 bool isVirtualOkay = false; 4482 4483 // Check that the return type is not an abstract class type. 4484 // For record types, this is done by the AbstractClassUsageDiagnoser once 4485 // the class has been completely parsed. 4486 if (!DC->isRecord() && 4487 RequireNonAbstractType(D.getIdentifierLoc(), 4488 R->getAs<FunctionType>()->getResultType(), 4489 diag::err_abstract_type_in_decl, 4490 AbstractReturnType)) 4491 D.setInvalidType(); 4492 4493 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4494 // This is a C++ constructor declaration. 4495 assert(DC->isRecord() && 4496 "Constructors can only be declared in a member context"); 4497 4498 R = CheckConstructorDeclarator(D, R, SC); 4499 4500 // Create the new declaration 4501 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4502 Context, 4503 cast<CXXRecordDecl>(DC), 4504 D.getSourceRange().getBegin(), 4505 NameInfo, R, TInfo, 4506 isExplicit, isInline, 4507 /*isImplicitlyDeclared=*/false, 4508 isConstexpr); 4509 4510 NewFD = NewCD; 4511 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4512 // This is a C++ destructor declaration. 4513 if (DC->isRecord()) { 4514 R = CheckDestructorDeclarator(D, R, SC); 4515 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4516 4517 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4518 D.getSourceRange().getBegin(), 4519 NameInfo, R, TInfo, 4520 isInline, 4521 /*isImplicitlyDeclared=*/false); 4522 NewFD = NewDD; 4523 isVirtualOkay = true; 4524 4525 // If the class is complete, then we now create the implicit exception 4526 // specification. If the class is incomplete or dependent, we can't do 4527 // it yet. 4528 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4529 Record->getDefinition() && !Record->isBeingDefined() && 4530 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4531 AdjustDestructorExceptionSpec(Record, NewDD); 4532 } 4533 4534 } else { 4535 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4536 4537 // Create a FunctionDecl to satisfy the function definition parsing 4538 // code path. 4539 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4540 D.getIdentifierLoc(), Name, R, TInfo, 4541 SC, SCAsWritten, isInline, 4542 /*hasPrototype=*/true, isConstexpr); 4543 D.setInvalidType(); 4544 } 4545 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4546 if (!DC->isRecord()) { 4547 Diag(D.getIdentifierLoc(), 4548 diag::err_conv_function_not_member); 4549 return 0; 4550 } 4551 4552 CheckConversionDeclarator(D, R, SC); 4553 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4554 D.getSourceRange().getBegin(), 4555 NameInfo, R, TInfo, 4556 isInline, isExplicit, isConstexpr, 4557 SourceLocation()); 4558 4559 isVirtualOkay = true; 4560 } else if (DC->isRecord()) { 4561 // If the name of the function is the same as the name of the record, 4562 // then this must be an invalid constructor that has a return type. 4563 // (The parser checks for a return type and makes the declarator a 4564 // constructor if it has no return type). 4565 if (Name.getAsIdentifierInfo() && 4566 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4567 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4568 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4569 << SourceRange(D.getIdentifierLoc()); 4570 return 0; 4571 } 4572 4573 bool isStatic = SC == SC_Static; 4574 4575 // [class.free]p1: 4576 // Any allocation function for a class T is a static member 4577 // (even if not explicitly declared static). 4578 if (Name.getCXXOverloadedOperator() == OO_New || 4579 Name.getCXXOverloadedOperator() == OO_Array_New) 4580 isStatic = true; 4581 4582 // [class.free]p6 Any deallocation function for a class X is a static member 4583 // (even if not explicitly declared static). 4584 if (Name.getCXXOverloadedOperator() == OO_Delete || 4585 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4586 isStatic = true; 4587 4588 // This is a C++ method declaration. 4589 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4590 Context, cast<CXXRecordDecl>(DC), 4591 D.getSourceRange().getBegin(), 4592 NameInfo, R, TInfo, 4593 isStatic, SCAsWritten, isInline, 4594 isConstexpr, 4595 SourceLocation()); 4596 NewFD = NewMD; 4597 4598 isVirtualOkay = !isStatic; 4599 } else { 4600 // Determine whether the function was written with a 4601 // prototype. This true when: 4602 // - we're in C++ (where every function has a prototype), 4603 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4604 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4605 true/*HasPrototype*/, isConstexpr); 4606 } 4607 4608 if (isFriend && !isInline && IsFunctionDefinition) { 4609 // C++ [class.friend]p5 4610 // A function can be defined in a friend declaration of a 4611 // class . . . . Such a function is implicitly inline. 4612 NewFD->setImplicitlyInline(); 4613 } 4614 4615 SetNestedNameSpecifier(NewFD, D); 4616 isExplicitSpecialization = false; 4617 isFunctionTemplateSpecialization = false; 4618 if (D.isInvalidType()) 4619 NewFD->setInvalidDecl(); 4620 4621 // Set the lexical context. If the declarator has a C++ 4622 // scope specifier, or is the object of a friend declaration, the 4623 // lexical context will be different from the semantic context. 4624 NewFD->setLexicalDeclContext(CurContext); 4625 4626 // Match up the template parameter lists with the scope specifier, then 4627 // determine whether we have a template or a template specialization. 4628 bool Invalid = false; 4629 if (TemplateParameterList *TemplateParams 4630 = MatchTemplateParametersToScopeSpecifier( 4631 D.getDeclSpec().getSourceRange().getBegin(), 4632 D.getIdentifierLoc(), 4633 D.getCXXScopeSpec(), 4634 TemplateParamLists.get(), 4635 TemplateParamLists.size(), 4636 isFriend, 4637 isExplicitSpecialization, 4638 Invalid)) { 4639 if (TemplateParams->size() > 0) { 4640 // This is a function template 4641 4642 // Check that we can declare a template here. 4643 if (CheckTemplateDeclScope(S, TemplateParams)) 4644 return 0; 4645 4646 // A destructor cannot be a template. 4647 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4648 Diag(NewFD->getLocation(), diag::err_destructor_template); 4649 return 0; 4650 } 4651 4652 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4653 NewFD->getLocation(), 4654 Name, TemplateParams, 4655 NewFD); 4656 FunctionTemplate->setLexicalDeclContext(CurContext); 4657 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4658 4659 // For source fidelity, store the other template param lists. 4660 if (TemplateParamLists.size() > 1) { 4661 NewFD->setTemplateParameterListsInfo(Context, 4662 TemplateParamLists.size() - 1, 4663 TemplateParamLists.release()); 4664 } 4665 } else { 4666 // This is a function template specialization. 4667 isFunctionTemplateSpecialization = true; 4668 // For source fidelity, store all the template param lists. 4669 NewFD->setTemplateParameterListsInfo(Context, 4670 TemplateParamLists.size(), 4671 TemplateParamLists.release()); 4672 4673 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4674 if (isFriend) { 4675 // We want to remove the "template<>", found here. 4676 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4677 4678 // If we remove the template<> and the name is not a 4679 // template-id, we're actually silently creating a problem: 4680 // the friend declaration will refer to an untemplated decl, 4681 // and clearly the user wants a template specialization. So 4682 // we need to insert '<>' after the name. 4683 SourceLocation InsertLoc; 4684 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4685 InsertLoc = D.getName().getSourceRange().getEnd(); 4686 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4687 } 4688 4689 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4690 << Name << RemoveRange 4691 << FixItHint::CreateRemoval(RemoveRange) 4692 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4693 } 4694 } 4695 } 4696 else { 4697 // All template param lists were matched against the scope specifier: 4698 // this is NOT (an explicit specialization of) a template. 4699 if (TemplateParamLists.size() > 0) 4700 // For source fidelity, store all the template param lists. 4701 NewFD->setTemplateParameterListsInfo(Context, 4702 TemplateParamLists.size(), 4703 TemplateParamLists.release()); 4704 } 4705 4706 if (Invalid) { 4707 NewFD->setInvalidDecl(); 4708 if (FunctionTemplate) 4709 FunctionTemplate->setInvalidDecl(); 4710 } 4711 4712 // C++ [dcl.fct.spec]p5: 4713 // The virtual specifier shall only be used in declarations of 4714 // nonstatic class member functions that appear within a 4715 // member-specification of a class declaration; see 10.3. 4716 // 4717 if (isVirtual && !NewFD->isInvalidDecl()) { 4718 if (!isVirtualOkay) { 4719 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4720 diag::err_virtual_non_function); 4721 } else if (!CurContext->isRecord()) { 4722 // 'virtual' was specified outside of the class. 4723 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4724 diag::err_virtual_out_of_class) 4725 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4726 } else if (NewFD->getDescribedFunctionTemplate()) { 4727 // C++ [temp.mem]p3: 4728 // A member function template shall not be virtual. 4729 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4730 diag::err_virtual_member_function_template) 4731 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4732 } else { 4733 // Okay: Add virtual to the method. 4734 NewFD->setVirtualAsWritten(true); 4735 } 4736 } 4737 4738 // C++ [dcl.fct.spec]p3: 4739 // The inline specifier shall not appear on a block scope function declaration. 4740 if (isInline && !NewFD->isInvalidDecl()) { 4741 if (CurContext->isFunctionOrMethod()) { 4742 // 'inline' is not allowed on block scope function declaration. 4743 Diag(D.getDeclSpec().getInlineSpecLoc(), 4744 diag::err_inline_declaration_block_scope) << Name 4745 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4746 } 4747 } 4748 4749 // C++ [dcl.fct.spec]p6: 4750 // The explicit specifier shall be used only in the declaration of a 4751 // constructor or conversion function within its class definition; see 12.3.1 4752 // and 12.3.2. 4753 if (isExplicit && !NewFD->isInvalidDecl()) { 4754 if (!CurContext->isRecord()) { 4755 // 'explicit' was specified outside of the class. 4756 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4757 diag::err_explicit_out_of_class) 4758 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4759 } else if (!isa<CXXConstructorDecl>(NewFD) && 4760 !isa<CXXConversionDecl>(NewFD)) { 4761 // 'explicit' was specified on a function that wasn't a constructor 4762 // or conversion function. 4763 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4764 diag::err_explicit_non_ctor_or_conv_function) 4765 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4766 } 4767 } 4768 4769 if (isConstexpr) { 4770 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4771 // are implicitly inline. 4772 NewFD->setImplicitlyInline(); 4773 4774 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4775 // be either constructors or to return a literal type. Therefore, 4776 // destructors cannot be declared constexpr. 4777 if (isa<CXXDestructorDecl>(NewFD)) 4778 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4779 } 4780 4781 // If __module_private__ was specified, mark the function accordingly. 4782 if (D.getDeclSpec().isModulePrivateSpecified()) { 4783 if (isFunctionTemplateSpecialization) { 4784 SourceLocation ModulePrivateLoc 4785 = D.getDeclSpec().getModulePrivateSpecLoc(); 4786 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4787 << 0 4788 << FixItHint::CreateRemoval(ModulePrivateLoc); 4789 } else { 4790 NewFD->setModulePrivate(); 4791 if (FunctionTemplate) 4792 FunctionTemplate->setModulePrivate(); 4793 } 4794 } 4795 4796 // Filter out previous declarations that don't match the scope. 4797 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4798 isExplicitSpecialization || 4799 isFunctionTemplateSpecialization); 4800 4801 if (isFriend) { 4802 // For now, claim that the objects have no previous declaration. 4803 if (FunctionTemplate) { 4804 FunctionTemplate->setObjectOfFriendDecl(false); 4805 FunctionTemplate->setAccess(AS_public); 4806 } 4807 NewFD->setObjectOfFriendDecl(false); 4808 NewFD->setAccess(AS_public); 4809 } 4810 4811 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4812 // A method is implicitly inline if it's defined in its class 4813 // definition. 4814 NewFD->setImplicitlyInline(); 4815 } 4816 4817 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4818 !CurContext->isRecord()) { 4819 // C++ [class.static]p1: 4820 // A data or function member of a class may be declared static 4821 // in a class definition, in which case it is a static member of 4822 // the class. 4823 4824 // Complain about the 'static' specifier if it's on an out-of-line 4825 // member function definition. 4826 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4827 diag::err_static_out_of_line) 4828 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4829 } 4830 } 4831 4832 // Handle GNU asm-label extension (encoded as an attribute). 4833 if (Expr *E = (Expr*) D.getAsmLabel()) { 4834 // The parser guarantees this is a string. 4835 StringLiteral *SE = cast<StringLiteral>(E); 4836 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4837 SE->getString())); 4838 } 4839 4840 // Copy the parameter declarations from the declarator D to the function 4841 // declaration NewFD, if they are available. First scavenge them into Params. 4842 SmallVector<ParmVarDecl*, 16> Params; 4843 if (D.isFunctionDeclarator()) { 4844 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4845 4846 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4847 // function that takes no arguments, not a function that takes a 4848 // single void argument. 4849 // We let through "const void" here because Sema::GetTypeForDeclarator 4850 // already checks for that case. 4851 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4852 FTI.ArgInfo[0].Param && 4853 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4854 // Empty arg list, don't push any params. 4855 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4856 4857 // In C++, the empty parameter-type-list must be spelled "void"; a 4858 // typedef of void is not permitted. 4859 if (getLangOptions().CPlusPlus && 4860 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4861 bool IsTypeAlias = false; 4862 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4863 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4864 else if (const TemplateSpecializationType *TST = 4865 Param->getType()->getAs<TemplateSpecializationType>()) 4866 IsTypeAlias = TST->isTypeAlias(); 4867 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4868 << IsTypeAlias; 4869 } 4870 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4871 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4872 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4873 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4874 Param->setDeclContext(NewFD); 4875 Params.push_back(Param); 4876 4877 if (Param->isInvalidDecl()) 4878 NewFD->setInvalidDecl(); 4879 } 4880 } 4881 4882 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4883 // When we're declaring a function with a typedef, typeof, etc as in the 4884 // following example, we'll need to synthesize (unnamed) 4885 // parameters for use in the declaration. 4886 // 4887 // @code 4888 // typedef void fn(int); 4889 // fn f; 4890 // @endcode 4891 4892 // Synthesize a parameter for each argument type. 4893 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4894 AE = FT->arg_type_end(); AI != AE; ++AI) { 4895 ParmVarDecl *Param = 4896 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4897 Param->setScopeInfo(0, Params.size()); 4898 Params.push_back(Param); 4899 } 4900 } else { 4901 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4902 "Should not need args for typedef of non-prototype fn"); 4903 } 4904 // Finally, we know we have the right number of parameters, install them. 4905 NewFD->setParams(Params); 4906 4907 // Process the non-inheritable attributes on this declaration. 4908 ProcessDeclAttributes(S, NewFD, D, 4909 /*NonInheritable=*/true, /*Inheritable=*/false); 4910 4911 if (!getLangOptions().CPlusPlus) { 4912 // Perform semantic checking on the function declaration. 4913 bool isExplicitSpecialization=false; 4914 if (!NewFD->isInvalidDecl()) { 4915 if (NewFD->getResultType()->isVariablyModifiedType()) { 4916 // Functions returning a variably modified type violate C99 6.7.5.2p2 4917 // because all functions have linkage. 4918 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4919 NewFD->setInvalidDecl(); 4920 } else { 4921 if (NewFD->isMain()) 4922 CheckMain(NewFD, D.getDeclSpec()); 4923 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4924 Redeclaration); 4925 } 4926 } 4927 assert((NewFD->isInvalidDecl() || !Redeclaration || 4928 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4929 "previous declaration set still overloaded"); 4930 } else { 4931 // If the declarator is a template-id, translate the parser's template 4932 // argument list into our AST format. 4933 bool HasExplicitTemplateArgs = false; 4934 TemplateArgumentListInfo TemplateArgs; 4935 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4936 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4937 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4938 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4939 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4940 TemplateId->getTemplateArgs(), 4941 TemplateId->NumArgs); 4942 translateTemplateArguments(TemplateArgsPtr, 4943 TemplateArgs); 4944 TemplateArgsPtr.release(); 4945 4946 HasExplicitTemplateArgs = true; 4947 4948 if (NewFD->isInvalidDecl()) { 4949 HasExplicitTemplateArgs = false; 4950 } else if (FunctionTemplate) { 4951 // Function template with explicit template arguments. 4952 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4953 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4954 4955 HasExplicitTemplateArgs = false; 4956 } else if (!isFunctionTemplateSpecialization && 4957 !D.getDeclSpec().isFriendSpecified()) { 4958 // We have encountered something that the user meant to be a 4959 // specialization (because it has explicitly-specified template 4960 // arguments) but that was not introduced with a "template<>" (or had 4961 // too few of them). 4962 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4963 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4964 << FixItHint::CreateInsertion( 4965 D.getDeclSpec().getSourceRange().getBegin(), 4966 "template<> "); 4967 isFunctionTemplateSpecialization = true; 4968 } else { 4969 // "friend void foo<>(int);" is an implicit specialization decl. 4970 isFunctionTemplateSpecialization = true; 4971 } 4972 } else if (isFriend && isFunctionTemplateSpecialization) { 4973 // This combination is only possible in a recovery case; the user 4974 // wrote something like: 4975 // template <> friend void foo(int); 4976 // which we're recovering from as if the user had written: 4977 // friend void foo<>(int); 4978 // Go ahead and fake up a template id. 4979 HasExplicitTemplateArgs = true; 4980 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4981 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4982 } 4983 4984 // If it's a friend (and only if it's a friend), it's possible 4985 // that either the specialized function type or the specialized 4986 // template is dependent, and therefore matching will fail. In 4987 // this case, don't check the specialization yet. 4988 if (isFunctionTemplateSpecialization && isFriend && 4989 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4990 assert(HasExplicitTemplateArgs && 4991 "friend function specialization without template args"); 4992 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4993 Previous)) 4994 NewFD->setInvalidDecl(); 4995 } else if (isFunctionTemplateSpecialization) { 4996 if (CurContext->isDependentContext() && CurContext->isRecord() 4997 && !isFriend) { 4998 isDependentClassScopeExplicitSpecialization = true; 4999 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5000 diag::ext_function_specialization_in_class : 5001 diag::err_function_specialization_in_class) 5002 << NewFD->getDeclName(); 5003 } else if (CheckFunctionTemplateSpecialization(NewFD, 5004 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5005 Previous)) 5006 NewFD->setInvalidDecl(); 5007 5008 // C++ [dcl.stc]p1: 5009 // A storage-class-specifier shall not be specified in an explicit 5010 // specialization (14.7.3) 5011 if (SC != SC_None) { 5012 if (SC != NewFD->getStorageClass()) 5013 Diag(NewFD->getLocation(), 5014 diag::err_explicit_specialization_inconsistent_storage_class) 5015 << SC 5016 << FixItHint::CreateRemoval( 5017 D.getDeclSpec().getStorageClassSpecLoc()); 5018 5019 else 5020 Diag(NewFD->getLocation(), 5021 diag::ext_explicit_specialization_storage_class) 5022 << FixItHint::CreateRemoval( 5023 D.getDeclSpec().getStorageClassSpecLoc()); 5024 } 5025 5026 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5027 if (CheckMemberSpecialization(NewFD, Previous)) 5028 NewFD->setInvalidDecl(); 5029 } 5030 5031 // Perform semantic checking on the function declaration. 5032 if (!isDependentClassScopeExplicitSpecialization) { 5033 if (NewFD->isInvalidDecl()) { 5034 // If this is a class member, mark the class invalid immediately. 5035 // This avoids some consistency errors later. 5036 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5037 methodDecl->getParent()->setInvalidDecl(); 5038 } else { 5039 if (NewFD->isMain()) 5040 CheckMain(NewFD, D.getDeclSpec()); 5041 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 5042 Redeclaration); 5043 } 5044 } 5045 5046 assert((NewFD->isInvalidDecl() || !Redeclaration || 5047 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5048 "previous declaration set still overloaded"); 5049 5050 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5051 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5052 NewFD->setInvalidDecl(); 5053 5054 NamedDecl *PrincipalDecl = (FunctionTemplate 5055 ? cast<NamedDecl>(FunctionTemplate) 5056 : NewFD); 5057 5058 if (isFriend && Redeclaration) { 5059 AccessSpecifier Access = AS_public; 5060 if (!NewFD->isInvalidDecl()) 5061 Access = NewFD->getPreviousDeclaration()->getAccess(); 5062 5063 NewFD->setAccess(Access); 5064 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5065 5066 PrincipalDecl->setObjectOfFriendDecl(true); 5067 } 5068 5069 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5070 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5071 PrincipalDecl->setNonMemberOperator(); 5072 5073 // If we have a function template, check the template parameter 5074 // list. This will check and merge default template arguments. 5075 if (FunctionTemplate) { 5076 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 5077 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5078 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 5079 D.getDeclSpec().isFriendSpecified() 5080 ? (IsFunctionDefinition 5081 ? TPC_FriendFunctionTemplateDefinition 5082 : TPC_FriendFunctionTemplate) 5083 : (D.getCXXScopeSpec().isSet() && 5084 DC && DC->isRecord() && 5085 DC->isDependentContext()) 5086 ? TPC_ClassTemplateMember 5087 : TPC_FunctionTemplate); 5088 } 5089 5090 if (NewFD->isInvalidDecl()) { 5091 // Ignore all the rest of this. 5092 } else if (!Redeclaration) { 5093 // Fake up an access specifier if it's supposed to be a class member. 5094 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5095 NewFD->setAccess(AS_public); 5096 5097 // Qualified decls generally require a previous declaration. 5098 if (D.getCXXScopeSpec().isSet()) { 5099 // ...with the major exception of templated-scope or 5100 // dependent-scope friend declarations. 5101 5102 // TODO: we currently also suppress this check in dependent 5103 // contexts because (1) the parameter depth will be off when 5104 // matching friend templates and (2) we might actually be 5105 // selecting a friend based on a dependent factor. But there 5106 // are situations where these conditions don't apply and we 5107 // can actually do this check immediately. 5108 if (isFriend && 5109 (TemplateParamLists.size() || 5110 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5111 CurContext->isDependentContext())) { 5112 // ignore these 5113 } else { 5114 // The user tried to provide an out-of-line definition for a 5115 // function that is a member of a class or namespace, but there 5116 // was no such member function declared (C++ [class.mfct]p2, 5117 // C++ [namespace.memdef]p2). For example: 5118 // 5119 // class X { 5120 // void f() const; 5121 // }; 5122 // 5123 // void X::f() { } // ill-formed 5124 // 5125 // Complain about this problem, and attempt to suggest close 5126 // matches (e.g., those that differ only in cv-qualifiers and 5127 // whether the parameter types are references). 5128 5129 DiagnoseInvalidRedeclaration(*this, NewFD, false); 5130 } 5131 5132 // Unqualified local friend declarations are required to resolve 5133 // to something. 5134 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5135 DiagnoseInvalidRedeclaration(*this, NewFD, true); 5136 } 5137 5138 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 5139 !isFriend && !isFunctionTemplateSpecialization && 5140 !isExplicitSpecialization) { 5141 // An out-of-line member function declaration must also be a 5142 // definition (C++ [dcl.meaning]p1). 5143 // Note that this is not the case for explicit specializations of 5144 // function templates or member functions of class templates, per 5145 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5146 // for compatibility with old SWIG code which likes to generate them. 5147 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5148 << D.getCXXScopeSpec().getRange(); 5149 } 5150 } 5151 5152 5153 // Handle attributes. We need to have merged decls when handling attributes 5154 // (for example to check for conflicts, etc). 5155 // FIXME: This needs to happen before we merge declarations. Then, 5156 // let attribute merging cope with attribute conflicts. 5157 ProcessDeclAttributes(S, NewFD, D, 5158 /*NonInheritable=*/false, /*Inheritable=*/true); 5159 5160 // attributes declared post-definition are currently ignored 5161 // FIXME: This should happen during attribute merging 5162 if (Redeclaration && Previous.isSingleResult()) { 5163 const FunctionDecl *Def; 5164 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5165 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5166 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5167 Diag(Def->getLocation(), diag::note_previous_definition); 5168 } 5169 } 5170 5171 AddKnownFunctionAttributes(NewFD); 5172 5173 if (NewFD->hasAttr<OverloadableAttr>() && 5174 !NewFD->getType()->getAs<FunctionProtoType>()) { 5175 Diag(NewFD->getLocation(), 5176 diag::err_attribute_overloadable_no_prototype) 5177 << NewFD; 5178 5179 // Turn this into a variadic function with no parameters. 5180 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5181 FunctionProtoType::ExtProtoInfo EPI; 5182 EPI.Variadic = true; 5183 EPI.ExtInfo = FT->getExtInfo(); 5184 5185 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5186 NewFD->setType(R); 5187 } 5188 5189 // If there's a #pragma GCC visibility in scope, and this isn't a class 5190 // member, set the visibility of this function. 5191 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5192 AddPushedVisibilityAttribute(NewFD); 5193 5194 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5195 // marking the function. 5196 AddCFAuditedAttribute(NewFD); 5197 5198 // If this is a locally-scoped extern C function, update the 5199 // map of such names. 5200 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5201 && !NewFD->isInvalidDecl()) 5202 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5203 5204 // Set this FunctionDecl's range up to the right paren. 5205 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5206 5207 if (getLangOptions().CPlusPlus) { 5208 if (FunctionTemplate) { 5209 if (NewFD->isInvalidDecl()) 5210 FunctionTemplate->setInvalidDecl(); 5211 return FunctionTemplate; 5212 } 5213 } 5214 5215 MarkUnusedFileScopedDecl(NewFD); 5216 5217 if (getLangOptions().CUDA) 5218 if (IdentifierInfo *II = NewFD->getIdentifier()) 5219 if (!NewFD->isInvalidDecl() && 5220 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5221 if (II->isStr("cudaConfigureCall")) { 5222 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5223 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5224 5225 Context.setcudaConfigureCallDecl(NewFD); 5226 } 5227 } 5228 5229 // Here we have an function template explicit specialization at class scope. 5230 // The actually specialization will be postponed to template instatiation 5231 // time via the ClassScopeFunctionSpecializationDecl node. 5232 if (isDependentClassScopeExplicitSpecialization) { 5233 ClassScopeFunctionSpecializationDecl *NewSpec = 5234 ClassScopeFunctionSpecializationDecl::Create( 5235 Context, CurContext, SourceLocation(), 5236 cast<CXXMethodDecl>(NewFD)); 5237 CurContext->addDecl(NewSpec); 5238 AddToScope = false; 5239 } 5240 5241 return NewFD; 5242} 5243 5244/// \brief Perform semantic checking of a new function declaration. 5245/// 5246/// Performs semantic analysis of the new function declaration 5247/// NewFD. This routine performs all semantic checking that does not 5248/// require the actual declarator involved in the declaration, and is 5249/// used both for the declaration of functions as they are parsed 5250/// (called via ActOnDeclarator) and for the declaration of functions 5251/// that have been instantiated via C++ template instantiation (called 5252/// via InstantiateDecl). 5253/// 5254/// \param IsExplicitSpecialiation whether this new function declaration is 5255/// an explicit specialization of the previous declaration. 5256/// 5257/// This sets NewFD->isInvalidDecl() to true if there was an error. 5258void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5259 LookupResult &Previous, 5260 bool IsExplicitSpecialization, 5261 bool &Redeclaration) { 5262 assert(!NewFD->getResultType()->isVariablyModifiedType() 5263 && "Variably modified return types are not handled here"); 5264 5265 // Check for a previous declaration of this name. 5266 if (Previous.empty() && NewFD->isExternC()) { 5267 // Since we did not find anything by this name and we're declaring 5268 // an extern "C" function, look for a non-visible extern "C" 5269 // declaration with the same name. 5270 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5271 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5272 if (Pos != LocallyScopedExternalDecls.end()) 5273 Previous.addDecl(Pos->second); 5274 } 5275 5276 // Merge or overload the declaration with an existing declaration of 5277 // the same name, if appropriate. 5278 if (!Previous.empty()) { 5279 // Determine whether NewFD is an overload of PrevDecl or 5280 // a declaration that requires merging. If it's an overload, 5281 // there's no more work to do here; we'll just add the new 5282 // function to the scope. 5283 5284 NamedDecl *OldDecl = 0; 5285 if (!AllowOverloadingOfFunction(Previous, Context)) { 5286 Redeclaration = true; 5287 OldDecl = Previous.getFoundDecl(); 5288 } else { 5289 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5290 /*NewIsUsingDecl*/ false)) { 5291 case Ovl_Match: 5292 Redeclaration = true; 5293 break; 5294 5295 case Ovl_NonFunction: 5296 Redeclaration = true; 5297 break; 5298 5299 case Ovl_Overload: 5300 Redeclaration = false; 5301 break; 5302 } 5303 5304 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5305 // If a function name is overloadable in C, then every function 5306 // with that name must be marked "overloadable". 5307 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5308 << Redeclaration << NewFD; 5309 NamedDecl *OverloadedDecl = 0; 5310 if (Redeclaration) 5311 OverloadedDecl = OldDecl; 5312 else if (!Previous.empty()) 5313 OverloadedDecl = Previous.getRepresentativeDecl(); 5314 if (OverloadedDecl) 5315 Diag(OverloadedDecl->getLocation(), 5316 diag::note_attribute_overloadable_prev_overload); 5317 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5318 Context)); 5319 } 5320 } 5321 5322 if (Redeclaration) { 5323 // NewFD and OldDecl represent declarations that need to be 5324 // merged. 5325 if (MergeFunctionDecl(NewFD, OldDecl)) 5326 return NewFD->setInvalidDecl(); 5327 5328 Previous.clear(); 5329 Previous.addDecl(OldDecl); 5330 5331 if (FunctionTemplateDecl *OldTemplateDecl 5332 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5333 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5334 FunctionTemplateDecl *NewTemplateDecl 5335 = NewFD->getDescribedFunctionTemplate(); 5336 assert(NewTemplateDecl && "Template/non-template mismatch"); 5337 if (CXXMethodDecl *Method 5338 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5339 Method->setAccess(OldTemplateDecl->getAccess()); 5340 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5341 } 5342 5343 // If this is an explicit specialization of a member that is a function 5344 // template, mark it as a member specialization. 5345 if (IsExplicitSpecialization && 5346 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5347 NewTemplateDecl->setMemberSpecialization(); 5348 assert(OldTemplateDecl->isMemberSpecialization()); 5349 } 5350 5351 if (OldTemplateDecl->isModulePrivate()) 5352 NewTemplateDecl->setModulePrivate(); 5353 5354 } else { 5355 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5356 NewFD->setAccess(OldDecl->getAccess()); 5357 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5358 } 5359 } 5360 } 5361 5362 // Semantic checking for this function declaration (in isolation). 5363 if (getLangOptions().CPlusPlus) { 5364 // C++-specific checks. 5365 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5366 CheckConstructor(Constructor); 5367 } else if (CXXDestructorDecl *Destructor = 5368 dyn_cast<CXXDestructorDecl>(NewFD)) { 5369 CXXRecordDecl *Record = Destructor->getParent(); 5370 QualType ClassType = Context.getTypeDeclType(Record); 5371 5372 // FIXME: Shouldn't we be able to perform this check even when the class 5373 // type is dependent? Both gcc and edg can handle that. 5374 if (!ClassType->isDependentType()) { 5375 DeclarationName Name 5376 = Context.DeclarationNames.getCXXDestructorName( 5377 Context.getCanonicalType(ClassType)); 5378 if (NewFD->getDeclName() != Name) { 5379 Diag(NewFD->getLocation(), diag::err_destructor_name); 5380 return NewFD->setInvalidDecl(); 5381 } 5382 } 5383 } else if (CXXConversionDecl *Conversion 5384 = dyn_cast<CXXConversionDecl>(NewFD)) { 5385 ActOnConversionDeclarator(Conversion); 5386 } 5387 5388 // Find any virtual functions that this function overrides. 5389 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5390 if (!Method->isFunctionTemplateSpecialization() && 5391 !Method->getDescribedFunctionTemplate()) { 5392 if (AddOverriddenMethods(Method->getParent(), Method)) { 5393 // If the function was marked as "static", we have a problem. 5394 if (NewFD->getStorageClass() == SC_Static) { 5395 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5396 << NewFD->getDeclName(); 5397 for (CXXMethodDecl::method_iterator 5398 Overridden = Method->begin_overridden_methods(), 5399 OverriddenEnd = Method->end_overridden_methods(); 5400 Overridden != OverriddenEnd; 5401 ++Overridden) { 5402 Diag((*Overridden)->getLocation(), 5403 diag::note_overridden_virtual_function); 5404 } 5405 } 5406 } 5407 } 5408 } 5409 5410 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5411 if (NewFD->isOverloadedOperator() && 5412 CheckOverloadedOperatorDeclaration(NewFD)) 5413 return NewFD->setInvalidDecl(); 5414 5415 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5416 if (NewFD->getLiteralIdentifier() && 5417 CheckLiteralOperatorDeclaration(NewFD)) 5418 return NewFD->setInvalidDecl(); 5419 5420 // In C++, check default arguments now that we have merged decls. Unless 5421 // the lexical context is the class, because in this case this is done 5422 // during delayed parsing anyway. 5423 if (!CurContext->isRecord()) 5424 CheckCXXDefaultArguments(NewFD); 5425 5426 // If this function declares a builtin function, check the type of this 5427 // declaration against the expected type for the builtin. 5428 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5429 ASTContext::GetBuiltinTypeError Error; 5430 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5431 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5432 // The type of this function differs from the type of the builtin, 5433 // so forget about the builtin entirely. 5434 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5435 } 5436 } 5437 } 5438} 5439 5440void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5441 // C++ [basic.start.main]p3: A program that declares main to be inline 5442 // or static is ill-formed. 5443 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5444 // shall not appear in a declaration of main. 5445 // static main is not an error under C99, but we should warn about it. 5446 if (FD->getStorageClass() == SC_Static) 5447 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5448 ? diag::err_static_main : diag::warn_static_main) 5449 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5450 if (FD->isInlineSpecified()) 5451 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5452 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5453 5454 QualType T = FD->getType(); 5455 assert(T->isFunctionType() && "function decl is not of function type"); 5456 const FunctionType* FT = T->getAs<FunctionType>(); 5457 5458 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5459 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5460 FD->setInvalidDecl(true); 5461 } 5462 5463 // Treat protoless main() as nullary. 5464 if (isa<FunctionNoProtoType>(FT)) return; 5465 5466 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5467 unsigned nparams = FTP->getNumArgs(); 5468 assert(FD->getNumParams() == nparams); 5469 5470 bool HasExtraParameters = (nparams > 3); 5471 5472 // Darwin passes an undocumented fourth argument of type char**. If 5473 // other platforms start sprouting these, the logic below will start 5474 // getting shifty. 5475 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5476 HasExtraParameters = false; 5477 5478 if (HasExtraParameters) { 5479 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5480 FD->setInvalidDecl(true); 5481 nparams = 3; 5482 } 5483 5484 // FIXME: a lot of the following diagnostics would be improved 5485 // if we had some location information about types. 5486 5487 QualType CharPP = 5488 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5489 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5490 5491 for (unsigned i = 0; i < nparams; ++i) { 5492 QualType AT = FTP->getArgType(i); 5493 5494 bool mismatch = true; 5495 5496 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5497 mismatch = false; 5498 else if (Expected[i] == CharPP) { 5499 // As an extension, the following forms are okay: 5500 // char const ** 5501 // char const * const * 5502 // char * const * 5503 5504 QualifierCollector qs; 5505 const PointerType* PT; 5506 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5507 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5508 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5509 qs.removeConst(); 5510 mismatch = !qs.empty(); 5511 } 5512 } 5513 5514 if (mismatch) { 5515 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5516 // TODO: suggest replacing given type with expected type 5517 FD->setInvalidDecl(true); 5518 } 5519 } 5520 5521 if (nparams == 1 && !FD->isInvalidDecl()) { 5522 Diag(FD->getLocation(), diag::warn_main_one_arg); 5523 } 5524 5525 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5526 Diag(FD->getLocation(), diag::err_main_template_decl); 5527 FD->setInvalidDecl(); 5528 } 5529} 5530 5531bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5532 // FIXME: Need strict checking. In C89, we need to check for 5533 // any assignment, increment, decrement, function-calls, or 5534 // commas outside of a sizeof. In C99, it's the same list, 5535 // except that the aforementioned are allowed in unevaluated 5536 // expressions. Everything else falls under the 5537 // "may accept other forms of constant expressions" exception. 5538 // (We never end up here for C++, so the constant expression 5539 // rules there don't matter.) 5540 if (Init->isConstantInitializer(Context, false)) 5541 return false; 5542 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5543 << Init->getSourceRange(); 5544 return true; 5545} 5546 5547namespace { 5548 // Visits an initialization expression to see if OrigDecl is evaluated in 5549 // its own initialization and throws a warning if it does. 5550 class SelfReferenceChecker 5551 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5552 Sema &S; 5553 Decl *OrigDecl; 5554 bool isRecordType; 5555 bool isPODType; 5556 5557 public: 5558 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5559 5560 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5561 S(S), OrigDecl(OrigDecl) { 5562 isPODType = false; 5563 isRecordType = false; 5564 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5565 isPODType = VD->getType().isPODType(S.Context); 5566 isRecordType = VD->getType()->isRecordType(); 5567 } 5568 } 5569 5570 void VisitExpr(Expr *E) { 5571 if (isa<ObjCMessageExpr>(*E)) return; 5572 if (isRecordType) { 5573 Expr *expr = E; 5574 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5575 ValueDecl *VD = ME->getMemberDecl(); 5576 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5577 expr = ME->getBase(); 5578 } 5579 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5580 HandleDeclRefExpr(DRE); 5581 return; 5582 } 5583 } 5584 Inherited::VisitExpr(E); 5585 } 5586 5587 void VisitMemberExpr(MemberExpr *E) { 5588 if (E->getType()->canDecayToPointerType()) return; 5589 if (isa<FieldDecl>(E->getMemberDecl())) 5590 if (DeclRefExpr *DRE 5591 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5592 HandleDeclRefExpr(DRE); 5593 return; 5594 } 5595 Inherited::VisitMemberExpr(E); 5596 } 5597 5598 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5599 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5600 (isRecordType && E->getCastKind() == CK_NoOp)) { 5601 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5602 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5603 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5604 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5605 HandleDeclRefExpr(DRE); 5606 return; 5607 } 5608 } 5609 Inherited::VisitImplicitCastExpr(E); 5610 } 5611 5612 void VisitUnaryOperator(UnaryOperator *E) { 5613 // For POD record types, addresses of its own members are well-defined. 5614 if (isRecordType && isPODType) return; 5615 Inherited::VisitUnaryOperator(E); 5616 } 5617 5618 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5619 Decl* ReferenceDecl = DRE->getDecl(); 5620 if (OrigDecl != ReferenceDecl) return; 5621 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5622 Sema::NotForRedeclaration); 5623 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5624 S.PDiag(diag::warn_uninit_self_reference_in_init) 5625 << Result.getLookupName() 5626 << OrigDecl->getLocation() 5627 << DRE->getSourceRange()); 5628 } 5629 }; 5630} 5631 5632/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5633void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5634 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5635} 5636 5637/// AddInitializerToDecl - Adds the initializer Init to the 5638/// declaration dcl. If DirectInit is true, this is C++ direct 5639/// initialization rather than copy initialization. 5640void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5641 bool DirectInit, bool TypeMayContainAuto) { 5642 // If there is no declaration, there was an error parsing it. Just ignore 5643 // the initializer. 5644 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5645 return; 5646 5647 // Check for self-references within variable initializers. 5648 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5649 // Variables declared within a function/method body are handled 5650 // by a dataflow analysis. 5651 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5652 CheckSelfReference(RealDecl, Init); 5653 } 5654 else { 5655 CheckSelfReference(RealDecl, Init); 5656 } 5657 5658 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5659 // With declarators parsed the way they are, the parser cannot 5660 // distinguish between a normal initializer and a pure-specifier. 5661 // Thus this grotesque test. 5662 IntegerLiteral *IL; 5663 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5664 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5665 CheckPureMethod(Method, Init->getSourceRange()); 5666 else { 5667 Diag(Method->getLocation(), diag::err_member_function_initialization) 5668 << Method->getDeclName() << Init->getSourceRange(); 5669 Method->setInvalidDecl(); 5670 } 5671 return; 5672 } 5673 5674 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5675 if (!VDecl) { 5676 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5677 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5678 RealDecl->setInvalidDecl(); 5679 return; 5680 } 5681 5682 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5683 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5684 TypeSourceInfo *DeducedType = 0; 5685 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5686 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5687 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5688 << Init->getSourceRange(); 5689 if (!DeducedType) { 5690 RealDecl->setInvalidDecl(); 5691 return; 5692 } 5693 VDecl->setTypeSourceInfo(DeducedType); 5694 VDecl->setType(DeducedType->getType()); 5695 5696 // In ARC, infer lifetime. 5697 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5698 VDecl->setInvalidDecl(); 5699 5700 // If this is a redeclaration, check that the type we just deduced matches 5701 // the previously declared type. 5702 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5703 MergeVarDeclTypes(VDecl, Old); 5704 } 5705 5706 5707 // A definition must end up with a complete type, which means it must be 5708 // complete with the restriction that an array type might be completed by the 5709 // initializer; note that later code assumes this restriction. 5710 QualType BaseDeclType = VDecl->getType(); 5711 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5712 BaseDeclType = Array->getElementType(); 5713 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5714 diag::err_typecheck_decl_incomplete_type)) { 5715 RealDecl->setInvalidDecl(); 5716 return; 5717 } 5718 5719 // The variable can not have an abstract class type. 5720 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5721 diag::err_abstract_type_in_decl, 5722 AbstractVariableType)) 5723 VDecl->setInvalidDecl(); 5724 5725 const VarDecl *Def; 5726 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5727 Diag(VDecl->getLocation(), diag::err_redefinition) 5728 << VDecl->getDeclName(); 5729 Diag(Def->getLocation(), diag::note_previous_definition); 5730 VDecl->setInvalidDecl(); 5731 return; 5732 } 5733 5734 const VarDecl* PrevInit = 0; 5735 if (getLangOptions().CPlusPlus) { 5736 // C++ [class.static.data]p4 5737 // If a static data member is of const integral or const 5738 // enumeration type, its declaration in the class definition can 5739 // specify a constant-initializer which shall be an integral 5740 // constant expression (5.19). In that case, the member can appear 5741 // in integral constant expressions. The member shall still be 5742 // defined in a namespace scope if it is used in the program and the 5743 // namespace scope definition shall not contain an initializer. 5744 // 5745 // We already performed a redefinition check above, but for static 5746 // data members we also need to check whether there was an in-class 5747 // declaration with an initializer. 5748 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5749 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5750 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5751 return; 5752 } 5753 5754 if (VDecl->hasLocalStorage()) 5755 getCurFunction()->setHasBranchProtectedScope(); 5756 5757 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5758 VDecl->setInvalidDecl(); 5759 return; 5760 } 5761 } 5762 5763 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5764 // a kernel function cannot be initialized." 5765 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5766 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5767 VDecl->setInvalidDecl(); 5768 return; 5769 } 5770 5771 // Capture the variable that is being initialized and the style of 5772 // initialization. 5773 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5774 5775 // FIXME: Poor source location information. 5776 InitializationKind Kind 5777 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5778 Init->getLocStart(), 5779 Init->getLocEnd()) 5780 : InitializationKind::CreateCopy(VDecl->getLocation(), 5781 Init->getLocStart()); 5782 5783 // Get the decls type and save a reference for later, since 5784 // CheckInitializerTypes may change it. 5785 QualType DclT = VDecl->getType(), SavT = DclT; 5786 if (VDecl->isLocalVarDecl()) { 5787 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5788 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5789 VDecl->setInvalidDecl(); 5790 } else if (!VDecl->isInvalidDecl()) { 5791 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5792 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5793 MultiExprArg(*this, &Init, 1), 5794 &DclT); 5795 if (Result.isInvalid()) { 5796 VDecl->setInvalidDecl(); 5797 return; 5798 } 5799 5800 Init = Result.takeAs<Expr>(); 5801 5802 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5803 // Don't check invalid declarations to avoid emitting useless diagnostics. 5804 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5805 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5806 CheckForConstantInitializer(Init, DclT); 5807 } 5808 } 5809 } else if (VDecl->isStaticDataMember() && 5810 VDecl->getLexicalDeclContext()->isRecord()) { 5811 // This is an in-class initialization for a static data member, e.g., 5812 // 5813 // struct S { 5814 // static const int value = 17; 5815 // }; 5816 5817 // Try to perform the initialization regardless. 5818 if (!VDecl->isInvalidDecl()) { 5819 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5820 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5821 MultiExprArg(*this, &Init, 1), 5822 &DclT); 5823 if (Result.isInvalid()) { 5824 VDecl->setInvalidDecl(); 5825 return; 5826 } 5827 5828 Init = Result.takeAs<Expr>(); 5829 } 5830 5831 // C++ [class.mem]p4: 5832 // A member-declarator can contain a constant-initializer only 5833 // if it declares a static member (9.4) of const integral or 5834 // const enumeration type, see 9.4.2. 5835 // 5836 // C++0x [class.static.data]p3: 5837 // If a non-volatile const static data member is of integral or 5838 // enumeration type, its declaration in the class definition can 5839 // specify a brace-or-equal-initializer in which every initalizer-clause 5840 // that is an assignment-expression is a constant expression. A static 5841 // data member of literal type can be declared in the class definition 5842 // with the constexpr specifier; if so, its declaration shall specify a 5843 // brace-or-equal-initializer in which every initializer-clause that is 5844 // an assignment-expression is a constant expression. 5845 QualType T = VDecl->getType(); 5846 5847 // Do nothing on dependent types. 5848 if (T->isDependentType()) { 5849 5850 // Allow any 'static constexpr' members, whether or not they are of literal 5851 // type. We separately check that the initializer is a constant expression, 5852 // which implicitly requires the member to be of literal type. 5853 } else if (VDecl->isConstexpr()) { 5854 5855 // Require constness. 5856 } else if (!T.isConstQualified()) { 5857 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5858 << Init->getSourceRange(); 5859 VDecl->setInvalidDecl(); 5860 5861 // We allow integer constant expressions in all cases. 5862 } else if (T->isIntegralOrEnumerationType()) { 5863 // Check whether the expression is a constant expression. 5864 SourceLocation Loc; 5865 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 5866 // In C++0x, a non-constexpr const static data member with an 5867 // in-class initializer cannot be volatile. 5868 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 5869 else if (Init->isValueDependent()) 5870 ; // Nothing to check. 5871 else if (Init->isIntegerConstantExpr(Context, &Loc)) 5872 ; // Ok, it's an ICE! 5873 else if (Init->isEvaluatable(Context)) { 5874 // If we can constant fold the initializer through heroics, accept it, 5875 // but report this as a use of an extension for -pedantic. 5876 Diag(Loc, diag::ext_in_class_initializer_non_constant) 5877 << Init->getSourceRange(); 5878 } else { 5879 // Otherwise, this is some crazy unknown case. Report the issue at the 5880 // location provided by the isIntegerConstantExpr failed check. 5881 Diag(Loc, diag::err_in_class_initializer_non_constant) 5882 << Init->getSourceRange(); 5883 VDecl->setInvalidDecl(); 5884 } 5885 5886 // We allow floating-point constants as an extension. 5887 } else if (T->isFloatingType()) { // also permits complex, which is ok 5888 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5889 << T << Init->getSourceRange(); 5890 if (getLangOptions().CPlusPlus0x) 5891 Diag(VDecl->getLocation(), 5892 diag::note_in_class_initializer_float_type_constexpr) 5893 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 5894 5895 if (!Init->isValueDependent() && 5896 !Init->isConstantInitializer(Context, false)) { 5897 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5898 << Init->getSourceRange(); 5899 VDecl->setInvalidDecl(); 5900 } 5901 5902 // Suggest adding 'constexpr' in C++0x for literal types. 5903 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 5904 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 5905 << T << Init->getSourceRange() 5906 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 5907 VDecl->setConstexpr(true); 5908 5909 } else { 5910 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5911 << T << Init->getSourceRange(); 5912 VDecl->setInvalidDecl(); 5913 } 5914 } else if (VDecl->isFileVarDecl()) { 5915 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5916 (!getLangOptions().CPlusPlus || 5917 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5918 Diag(VDecl->getLocation(), diag::warn_extern_init); 5919 if (!VDecl->isInvalidDecl()) { 5920 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5921 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5922 MultiExprArg(*this, &Init, 1), 5923 &DclT); 5924 if (Result.isInvalid()) { 5925 VDecl->setInvalidDecl(); 5926 return; 5927 } 5928 5929 Init = Result.takeAs<Expr>(); 5930 } 5931 5932 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5933 // Don't check invalid declarations to avoid emitting useless diagnostics. 5934 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5935 // C99 6.7.8p4. All file scoped initializers need to be constant. 5936 CheckForConstantInitializer(Init, DclT); 5937 } 5938 } 5939 // If the type changed, it means we had an incomplete type that was 5940 // completed by the initializer. For example: 5941 // int ary[] = { 1, 3, 5 }; 5942 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5943 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5944 VDecl->setType(DclT); 5945 Init->setType(DclT); 5946 } 5947 5948 // Check any implicit conversions within the expression. 5949 CheckImplicitConversions(Init, VDecl->getLocation()); 5950 5951 if (!VDecl->isInvalidDecl()) 5952 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 5953 5954 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 5955 !VDecl->getType()->isDependentType() && 5956 !Init->isTypeDependent() && !Init->isValueDependent() && 5957 !Init->isConstantInitializer(Context, 5958 VDecl->getType()->isReferenceType())) { 5959 // FIXME: Improve this diagnostic to explain why the initializer is not 5960 // a constant expression. 5961 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 5962 << VDecl << Init->getSourceRange(); 5963 } 5964 5965 Init = MaybeCreateExprWithCleanups(Init); 5966 // Attach the initializer to the decl. 5967 VDecl->setInit(Init); 5968 5969 CheckCompleteVariableDeclaration(VDecl); 5970} 5971 5972/// ActOnInitializerError - Given that there was an error parsing an 5973/// initializer for the given declaration, try to return to some form 5974/// of sanity. 5975void Sema::ActOnInitializerError(Decl *D) { 5976 // Our main concern here is re-establishing invariants like "a 5977 // variable's type is either dependent or complete". 5978 if (!D || D->isInvalidDecl()) return; 5979 5980 VarDecl *VD = dyn_cast<VarDecl>(D); 5981 if (!VD) return; 5982 5983 // Auto types are meaningless if we can't make sense of the initializer. 5984 if (ParsingInitForAutoVars.count(D)) { 5985 D->setInvalidDecl(); 5986 return; 5987 } 5988 5989 QualType Ty = VD->getType(); 5990 if (Ty->isDependentType()) return; 5991 5992 // Require a complete type. 5993 if (RequireCompleteType(VD->getLocation(), 5994 Context.getBaseElementType(Ty), 5995 diag::err_typecheck_decl_incomplete_type)) { 5996 VD->setInvalidDecl(); 5997 return; 5998 } 5999 6000 // Require an abstract type. 6001 if (RequireNonAbstractType(VD->getLocation(), Ty, 6002 diag::err_abstract_type_in_decl, 6003 AbstractVariableType)) { 6004 VD->setInvalidDecl(); 6005 return; 6006 } 6007 6008 // Don't bother complaining about constructors or destructors, 6009 // though. 6010} 6011 6012void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6013 bool TypeMayContainAuto) { 6014 // If there is no declaration, there was an error parsing it. Just ignore it. 6015 if (RealDecl == 0) 6016 return; 6017 6018 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6019 QualType Type = Var->getType(); 6020 6021 // C++0x [dcl.spec.auto]p3 6022 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6023 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6024 << Var->getDeclName() << Type; 6025 Var->setInvalidDecl(); 6026 return; 6027 } 6028 6029 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6030 // have an initializer. 6031 // C++0x [class.static.data]p3: A static data member can be declared with 6032 // the constexpr specifier; if so, its declaration shall specify 6033 // a brace-or-equal-initializer. 6034 if (Var->isConstexpr()) { 6035 // FIXME: Provide fix-its to convert the constexpr to const. 6036 if (Var->isStaticDataMember() && Var->getAnyInitializer()) { 6037 Diag(Var->getLocation(), diag::err_constexpr_initialized_static_member) 6038 << Var->getDeclName(); 6039 } else { 6040 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6041 << Var->getDeclName(); 6042 } 6043 Var->setInvalidDecl(); 6044 return; 6045 } 6046 6047 switch (Var->isThisDeclarationADefinition()) { 6048 case VarDecl::Definition: 6049 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6050 break; 6051 6052 // We have an out-of-line definition of a static data member 6053 // that has an in-class initializer, so we type-check this like 6054 // a declaration. 6055 // 6056 // Fall through 6057 6058 case VarDecl::DeclarationOnly: 6059 // It's only a declaration. 6060 6061 // Block scope. C99 6.7p7: If an identifier for an object is 6062 // declared with no linkage (C99 6.2.2p6), the type for the 6063 // object shall be complete. 6064 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6065 !Var->getLinkage() && !Var->isInvalidDecl() && 6066 RequireCompleteType(Var->getLocation(), Type, 6067 diag::err_typecheck_decl_incomplete_type)) 6068 Var->setInvalidDecl(); 6069 6070 // Make sure that the type is not abstract. 6071 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6072 RequireNonAbstractType(Var->getLocation(), Type, 6073 diag::err_abstract_type_in_decl, 6074 AbstractVariableType)) 6075 Var->setInvalidDecl(); 6076 return; 6077 6078 case VarDecl::TentativeDefinition: 6079 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6080 // object that has file scope without an initializer, and without a 6081 // storage-class specifier or with the storage-class specifier "static", 6082 // constitutes a tentative definition. Note: A tentative definition with 6083 // external linkage is valid (C99 6.2.2p5). 6084 if (!Var->isInvalidDecl()) { 6085 if (const IncompleteArrayType *ArrayT 6086 = Context.getAsIncompleteArrayType(Type)) { 6087 if (RequireCompleteType(Var->getLocation(), 6088 ArrayT->getElementType(), 6089 diag::err_illegal_decl_array_incomplete_type)) 6090 Var->setInvalidDecl(); 6091 } else if (Var->getStorageClass() == SC_Static) { 6092 // C99 6.9.2p3: If the declaration of an identifier for an object is 6093 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6094 // declared type shall not be an incomplete type. 6095 // NOTE: code such as the following 6096 // static struct s; 6097 // struct s { int a; }; 6098 // is accepted by gcc. Hence here we issue a warning instead of 6099 // an error and we do not invalidate the static declaration. 6100 // NOTE: to avoid multiple warnings, only check the first declaration. 6101 if (Var->getPreviousDeclaration() == 0) 6102 RequireCompleteType(Var->getLocation(), Type, 6103 diag::ext_typecheck_decl_incomplete_type); 6104 } 6105 } 6106 6107 // Record the tentative definition; we're done. 6108 if (!Var->isInvalidDecl()) 6109 TentativeDefinitions.push_back(Var); 6110 return; 6111 } 6112 6113 // Provide a specific diagnostic for uninitialized variable 6114 // definitions with incomplete array type. 6115 if (Type->isIncompleteArrayType()) { 6116 Diag(Var->getLocation(), 6117 diag::err_typecheck_incomplete_array_needs_initializer); 6118 Var->setInvalidDecl(); 6119 return; 6120 } 6121 6122 // Provide a specific diagnostic for uninitialized variable 6123 // definitions with reference type. 6124 if (Type->isReferenceType()) { 6125 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6126 << Var->getDeclName() 6127 << SourceRange(Var->getLocation(), Var->getLocation()); 6128 Var->setInvalidDecl(); 6129 return; 6130 } 6131 6132 // Do not attempt to type-check the default initializer for a 6133 // variable with dependent type. 6134 if (Type->isDependentType()) 6135 return; 6136 6137 if (Var->isInvalidDecl()) 6138 return; 6139 6140 if (RequireCompleteType(Var->getLocation(), 6141 Context.getBaseElementType(Type), 6142 diag::err_typecheck_decl_incomplete_type)) { 6143 Var->setInvalidDecl(); 6144 return; 6145 } 6146 6147 // The variable can not have an abstract class type. 6148 if (RequireNonAbstractType(Var->getLocation(), Type, 6149 diag::err_abstract_type_in_decl, 6150 AbstractVariableType)) { 6151 Var->setInvalidDecl(); 6152 return; 6153 } 6154 6155 // Check for jumps past the implicit initializer. C++0x 6156 // clarifies that this applies to a "variable with automatic 6157 // storage duration", not a "local variable". 6158 // C++0x [stmt.dcl]p3 6159 // A program that jumps from a point where a variable with automatic 6160 // storage duration is not in scope to a point where it is in scope is 6161 // ill-formed unless the variable has scalar type, class type with a 6162 // trivial default constructor and a trivial destructor, a cv-qualified 6163 // version of one of these types, or an array of one of the preceding 6164 // types and is declared without an initializer. 6165 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6166 if (const RecordType *Record 6167 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6168 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6169 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 6170 (getLangOptions().CPlusPlus0x && 6171 (!CXXRecord->hasTrivialDefaultConstructor() || 6172 !CXXRecord->hasTrivialDestructor()))) 6173 getCurFunction()->setHasBranchProtectedScope(); 6174 } 6175 } 6176 6177 // C++03 [dcl.init]p9: 6178 // If no initializer is specified for an object, and the 6179 // object is of (possibly cv-qualified) non-POD class type (or 6180 // array thereof), the object shall be default-initialized; if 6181 // the object is of const-qualified type, the underlying class 6182 // type shall have a user-declared default 6183 // constructor. Otherwise, if no initializer is specified for 6184 // a non- static object, the object and its subobjects, if 6185 // any, have an indeterminate initial value); if the object 6186 // or any of its subobjects are of const-qualified type, the 6187 // program is ill-formed. 6188 // C++0x [dcl.init]p11: 6189 // If no initializer is specified for an object, the object is 6190 // default-initialized; [...]. 6191 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6192 InitializationKind Kind 6193 = InitializationKind::CreateDefault(Var->getLocation()); 6194 6195 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6196 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6197 MultiExprArg(*this, 0, 0)); 6198 if (Init.isInvalid()) 6199 Var->setInvalidDecl(); 6200 else if (Init.get()) 6201 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6202 6203 CheckCompleteVariableDeclaration(Var); 6204 } 6205} 6206 6207void Sema::ActOnCXXForRangeDecl(Decl *D) { 6208 VarDecl *VD = dyn_cast<VarDecl>(D); 6209 if (!VD) { 6210 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6211 D->setInvalidDecl(); 6212 return; 6213 } 6214 6215 VD->setCXXForRangeDecl(true); 6216 6217 // for-range-declaration cannot be given a storage class specifier. 6218 int Error = -1; 6219 switch (VD->getStorageClassAsWritten()) { 6220 case SC_None: 6221 break; 6222 case SC_Extern: 6223 Error = 0; 6224 break; 6225 case SC_Static: 6226 Error = 1; 6227 break; 6228 case SC_PrivateExtern: 6229 Error = 2; 6230 break; 6231 case SC_Auto: 6232 Error = 3; 6233 break; 6234 case SC_Register: 6235 Error = 4; 6236 break; 6237 case SC_OpenCLWorkGroupLocal: 6238 llvm_unreachable("Unexpected storage class"); 6239 } 6240 if (VD->isConstexpr()) 6241 Error = 5; 6242 if (Error != -1) { 6243 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6244 << VD->getDeclName() << Error; 6245 D->setInvalidDecl(); 6246 } 6247} 6248 6249void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6250 if (var->isInvalidDecl()) return; 6251 6252 // In ARC, don't allow jumps past the implicit initialization of a 6253 // local retaining variable. 6254 if (getLangOptions().ObjCAutoRefCount && 6255 var->hasLocalStorage()) { 6256 switch (var->getType().getObjCLifetime()) { 6257 case Qualifiers::OCL_None: 6258 case Qualifiers::OCL_ExplicitNone: 6259 case Qualifiers::OCL_Autoreleasing: 6260 break; 6261 6262 case Qualifiers::OCL_Weak: 6263 case Qualifiers::OCL_Strong: 6264 getCurFunction()->setHasBranchProtectedScope(); 6265 break; 6266 } 6267 } 6268 6269 // All the following checks are C++ only. 6270 if (!getLangOptions().CPlusPlus) return; 6271 6272 QualType baseType = Context.getBaseElementType(var->getType()); 6273 if (baseType->isDependentType()) return; 6274 6275 // __block variables might require us to capture a copy-initializer. 6276 if (var->hasAttr<BlocksAttr>()) { 6277 // It's currently invalid to ever have a __block variable with an 6278 // array type; should we diagnose that here? 6279 6280 // Regardless, we don't want to ignore array nesting when 6281 // constructing this copy. 6282 QualType type = var->getType(); 6283 6284 if (type->isStructureOrClassType()) { 6285 SourceLocation poi = var->getLocation(); 6286 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6287 ExprResult result = 6288 PerformCopyInitialization( 6289 InitializedEntity::InitializeBlock(poi, type, false), 6290 poi, Owned(varRef)); 6291 if (!result.isInvalid()) { 6292 result = MaybeCreateExprWithCleanups(result); 6293 Expr *init = result.takeAs<Expr>(); 6294 Context.setBlockVarCopyInits(var, init); 6295 } 6296 } 6297 } 6298 6299 // Check for global constructors. 6300 if (!var->getDeclContext()->isDependentContext() && 6301 var->hasGlobalStorage() && 6302 !var->isStaticLocal() && 6303 var->getInit() && 6304 !var->getInit()->isConstantInitializer(Context, 6305 baseType->isReferenceType())) 6306 Diag(var->getLocation(), diag::warn_global_constructor) 6307 << var->getInit()->getSourceRange(); 6308 6309 // Require the destructor. 6310 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6311 FinalizeVarWithDestructor(var, recordType); 6312} 6313 6314/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6315/// any semantic actions necessary after any initializer has been attached. 6316void 6317Sema::FinalizeDeclaration(Decl *ThisDecl) { 6318 // Note that we are no longer parsing the initializer for this declaration. 6319 ParsingInitForAutoVars.erase(ThisDecl); 6320} 6321 6322Sema::DeclGroupPtrTy 6323Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6324 Decl **Group, unsigned NumDecls) { 6325 SmallVector<Decl*, 8> Decls; 6326 6327 if (DS.isTypeSpecOwned()) 6328 Decls.push_back(DS.getRepAsDecl()); 6329 6330 for (unsigned i = 0; i != NumDecls; ++i) 6331 if (Decl *D = Group[i]) 6332 Decls.push_back(D); 6333 6334 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6335 DS.getTypeSpecType() == DeclSpec::TST_auto); 6336} 6337 6338/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6339/// group, performing any necessary semantic checking. 6340Sema::DeclGroupPtrTy 6341Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6342 bool TypeMayContainAuto) { 6343 // C++0x [dcl.spec.auto]p7: 6344 // If the type deduced for the template parameter U is not the same in each 6345 // deduction, the program is ill-formed. 6346 // FIXME: When initializer-list support is added, a distinction is needed 6347 // between the deduced type U and the deduced type which 'auto' stands for. 6348 // auto a = 0, b = { 1, 2, 3 }; 6349 // is legal because the deduced type U is 'int' in both cases. 6350 if (TypeMayContainAuto && NumDecls > 1) { 6351 QualType Deduced; 6352 CanQualType DeducedCanon; 6353 VarDecl *DeducedDecl = 0; 6354 for (unsigned i = 0; i != NumDecls; ++i) { 6355 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6356 AutoType *AT = D->getType()->getContainedAutoType(); 6357 // Don't reissue diagnostics when instantiating a template. 6358 if (AT && D->isInvalidDecl()) 6359 break; 6360 if (AT && AT->isDeduced()) { 6361 QualType U = AT->getDeducedType(); 6362 CanQualType UCanon = Context.getCanonicalType(U); 6363 if (Deduced.isNull()) { 6364 Deduced = U; 6365 DeducedCanon = UCanon; 6366 DeducedDecl = D; 6367 } else if (DeducedCanon != UCanon) { 6368 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6369 diag::err_auto_different_deductions) 6370 << Deduced << DeducedDecl->getDeclName() 6371 << U << D->getDeclName() 6372 << DeducedDecl->getInit()->getSourceRange() 6373 << D->getInit()->getSourceRange(); 6374 D->setInvalidDecl(); 6375 break; 6376 } 6377 } 6378 } 6379 } 6380 } 6381 6382 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6383} 6384 6385 6386/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6387/// to introduce parameters into function prototype scope. 6388Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6389 const DeclSpec &DS = D.getDeclSpec(); 6390 6391 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6392 VarDecl::StorageClass StorageClass = SC_None; 6393 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6394 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6395 StorageClass = SC_Register; 6396 StorageClassAsWritten = SC_Register; 6397 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6398 Diag(DS.getStorageClassSpecLoc(), 6399 diag::err_invalid_storage_class_in_func_decl); 6400 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6401 } 6402 6403 if (D.getDeclSpec().isThreadSpecified()) 6404 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6405 if (D.getDeclSpec().isConstexprSpecified()) 6406 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6407 << 0; 6408 6409 DiagnoseFunctionSpecifiers(D); 6410 6411 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6412 QualType parmDeclType = TInfo->getType(); 6413 6414 if (getLangOptions().CPlusPlus) { 6415 // Check that there are no default arguments inside the type of this 6416 // parameter. 6417 CheckExtraCXXDefaultArguments(D); 6418 6419 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6420 if (D.getCXXScopeSpec().isSet()) { 6421 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6422 << D.getCXXScopeSpec().getRange(); 6423 D.getCXXScopeSpec().clear(); 6424 } 6425 } 6426 6427 // Ensure we have a valid name 6428 IdentifierInfo *II = 0; 6429 if (D.hasName()) { 6430 II = D.getIdentifier(); 6431 if (!II) { 6432 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6433 << GetNameForDeclarator(D).getName().getAsString(); 6434 D.setInvalidType(true); 6435 } 6436 } 6437 6438 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6439 if (II) { 6440 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6441 ForRedeclaration); 6442 LookupName(R, S); 6443 if (R.isSingleResult()) { 6444 NamedDecl *PrevDecl = R.getFoundDecl(); 6445 if (PrevDecl->isTemplateParameter()) { 6446 // Maybe we will complain about the shadowed template parameter. 6447 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6448 // Just pretend that we didn't see the previous declaration. 6449 PrevDecl = 0; 6450 } else if (S->isDeclScope(PrevDecl)) { 6451 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6452 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6453 6454 // Recover by removing the name 6455 II = 0; 6456 D.SetIdentifier(0, D.getIdentifierLoc()); 6457 D.setInvalidType(true); 6458 } 6459 } 6460 } 6461 6462 // Temporarily put parameter variables in the translation unit, not 6463 // the enclosing context. This prevents them from accidentally 6464 // looking like class members in C++. 6465 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6466 D.getSourceRange().getBegin(), 6467 D.getIdentifierLoc(), II, 6468 parmDeclType, TInfo, 6469 StorageClass, StorageClassAsWritten); 6470 6471 if (D.isInvalidType()) 6472 New->setInvalidDecl(); 6473 6474 assert(S->isFunctionPrototypeScope()); 6475 assert(S->getFunctionPrototypeDepth() >= 1); 6476 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6477 S->getNextFunctionPrototypeIndex()); 6478 6479 // Add the parameter declaration into this scope. 6480 S->AddDecl(New); 6481 if (II) 6482 IdResolver.AddDecl(New); 6483 6484 ProcessDeclAttributes(S, New, D); 6485 6486 if (D.getDeclSpec().isModulePrivateSpecified()) 6487 Diag(New->getLocation(), diag::err_module_private_local) 6488 << 1 << New->getDeclName() 6489 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6490 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6491 6492 if (New->hasAttr<BlocksAttr>()) { 6493 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6494 } 6495 return New; 6496} 6497 6498/// \brief Synthesizes a variable for a parameter arising from a 6499/// typedef. 6500ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6501 SourceLocation Loc, 6502 QualType T) { 6503 /* FIXME: setting StartLoc == Loc. 6504 Would it be worth to modify callers so as to provide proper source 6505 location for the unnamed parameters, embedding the parameter's type? */ 6506 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6507 T, Context.getTrivialTypeSourceInfo(T, Loc), 6508 SC_None, SC_None, 0); 6509 Param->setImplicit(); 6510 return Param; 6511} 6512 6513void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6514 ParmVarDecl * const *ParamEnd) { 6515 // Don't diagnose unused-parameter errors in template instantiations; we 6516 // will already have done so in the template itself. 6517 if (!ActiveTemplateInstantiations.empty()) 6518 return; 6519 6520 for (; Param != ParamEnd; ++Param) { 6521 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6522 !(*Param)->hasAttr<UnusedAttr>()) { 6523 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6524 << (*Param)->getDeclName(); 6525 } 6526 } 6527} 6528 6529void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6530 ParmVarDecl * const *ParamEnd, 6531 QualType ReturnTy, 6532 NamedDecl *D) { 6533 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6534 return; 6535 6536 // Warn if the return value is pass-by-value and larger than the specified 6537 // threshold. 6538 if (ReturnTy.isPODType(Context)) { 6539 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6540 if (Size > LangOpts.NumLargeByValueCopy) 6541 Diag(D->getLocation(), diag::warn_return_value_size) 6542 << D->getDeclName() << Size; 6543 } 6544 6545 // Warn if any parameter is pass-by-value and larger than the specified 6546 // threshold. 6547 for (; Param != ParamEnd; ++Param) { 6548 QualType T = (*Param)->getType(); 6549 if (!T.isPODType(Context)) 6550 continue; 6551 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6552 if (Size > LangOpts.NumLargeByValueCopy) 6553 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6554 << (*Param)->getDeclName() << Size; 6555 } 6556} 6557 6558ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6559 SourceLocation NameLoc, IdentifierInfo *Name, 6560 QualType T, TypeSourceInfo *TSInfo, 6561 VarDecl::StorageClass StorageClass, 6562 VarDecl::StorageClass StorageClassAsWritten) { 6563 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6564 if (getLangOptions().ObjCAutoRefCount && 6565 T.getObjCLifetime() == Qualifiers::OCL_None && 6566 T->isObjCLifetimeType()) { 6567 6568 Qualifiers::ObjCLifetime lifetime; 6569 6570 // Special cases for arrays: 6571 // - if it's const, use __unsafe_unretained 6572 // - otherwise, it's an error 6573 if (T->isArrayType()) { 6574 if (!T.isConstQualified()) { 6575 Diag(NameLoc, diag::err_arc_array_param_no_ownership) 6576 << TSInfo->getTypeLoc().getSourceRange(); 6577 } 6578 lifetime = Qualifiers::OCL_ExplicitNone; 6579 } else { 6580 lifetime = T->getObjCARCImplicitLifetime(); 6581 } 6582 T = Context.getLifetimeQualifiedType(T, lifetime); 6583 } 6584 6585 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6586 Context.getAdjustedParameterType(T), 6587 TSInfo, 6588 StorageClass, StorageClassAsWritten, 6589 0); 6590 6591 // Parameters can not be abstract class types. 6592 // For record types, this is done by the AbstractClassUsageDiagnoser once 6593 // the class has been completely parsed. 6594 if (!CurContext->isRecord() && 6595 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6596 AbstractParamType)) 6597 New->setInvalidDecl(); 6598 6599 // Parameter declarators cannot be interface types. All ObjC objects are 6600 // passed by reference. 6601 if (T->isObjCObjectType()) { 6602 Diag(NameLoc, 6603 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6604 << FixItHint::CreateInsertion(NameLoc, "*"); 6605 T = Context.getObjCObjectPointerType(T); 6606 New->setType(T); 6607 } 6608 6609 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6610 // duration shall not be qualified by an address-space qualifier." 6611 // Since all parameters have automatic store duration, they can not have 6612 // an address space. 6613 if (T.getAddressSpace() != 0) { 6614 Diag(NameLoc, diag::err_arg_with_address_space); 6615 New->setInvalidDecl(); 6616 } 6617 6618 return New; 6619} 6620 6621void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6622 SourceLocation LocAfterDecls) { 6623 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6624 6625 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6626 // for a K&R function. 6627 if (!FTI.hasPrototype) { 6628 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6629 --i; 6630 if (FTI.ArgInfo[i].Param == 0) { 6631 llvm::SmallString<256> Code; 6632 llvm::raw_svector_ostream(Code) << " int " 6633 << FTI.ArgInfo[i].Ident->getName() 6634 << ";\n"; 6635 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6636 << FTI.ArgInfo[i].Ident 6637 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6638 6639 // Implicitly declare the argument as type 'int' for lack of a better 6640 // type. 6641 AttributeFactory attrs; 6642 DeclSpec DS(attrs); 6643 const char* PrevSpec; // unused 6644 unsigned DiagID; // unused 6645 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6646 PrevSpec, DiagID); 6647 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6648 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6649 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6650 } 6651 } 6652 } 6653} 6654 6655Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6656 Declarator &D) { 6657 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6658 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6659 Scope *ParentScope = FnBodyScope->getParent(); 6660 6661 Decl *DP = HandleDeclarator(ParentScope, D, 6662 MultiTemplateParamsArg(*this), 6663 /*IsFunctionDefinition=*/true); 6664 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6665} 6666 6667static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6668 // Don't warn about invalid declarations. 6669 if (FD->isInvalidDecl()) 6670 return false; 6671 6672 // Or declarations that aren't global. 6673 if (!FD->isGlobal()) 6674 return false; 6675 6676 // Don't warn about C++ member functions. 6677 if (isa<CXXMethodDecl>(FD)) 6678 return false; 6679 6680 // Don't warn about 'main'. 6681 if (FD->isMain()) 6682 return false; 6683 6684 // Don't warn about inline functions. 6685 if (FD->isInlined()) 6686 return false; 6687 6688 // Don't warn about function templates. 6689 if (FD->getDescribedFunctionTemplate()) 6690 return false; 6691 6692 // Don't warn about function template specializations. 6693 if (FD->isFunctionTemplateSpecialization()) 6694 return false; 6695 6696 bool MissingPrototype = true; 6697 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6698 Prev; Prev = Prev->getPreviousDeclaration()) { 6699 // Ignore any declarations that occur in function or method 6700 // scope, because they aren't visible from the header. 6701 if (Prev->getDeclContext()->isFunctionOrMethod()) 6702 continue; 6703 6704 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6705 break; 6706 } 6707 6708 return MissingPrototype; 6709} 6710 6711void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6712 // Don't complain if we're in GNU89 mode and the previous definition 6713 // was an extern inline function. 6714 const FunctionDecl *Definition; 6715 if (FD->isDefined(Definition) && 6716 !canRedefineFunction(Definition, getLangOptions())) { 6717 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6718 Definition->getStorageClass() == SC_Extern) 6719 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6720 << FD->getDeclName() << getLangOptions().CPlusPlus; 6721 else 6722 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6723 Diag(Definition->getLocation(), diag::note_previous_definition); 6724 } 6725} 6726 6727Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6728 // Clear the last template instantiation error context. 6729 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6730 6731 if (!D) 6732 return D; 6733 FunctionDecl *FD = 0; 6734 6735 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6736 FD = FunTmpl->getTemplatedDecl(); 6737 else 6738 FD = cast<FunctionDecl>(D); 6739 6740 // Enter a new function scope 6741 PushFunctionScope(); 6742 6743 // See if this is a redefinition. 6744 if (!FD->isLateTemplateParsed()) 6745 CheckForFunctionRedefinition(FD); 6746 6747 // Builtin functions cannot be defined. 6748 if (unsigned BuiltinID = FD->getBuiltinID()) { 6749 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6750 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6751 FD->setInvalidDecl(); 6752 } 6753 } 6754 6755 // The return type of a function definition must be complete 6756 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6757 QualType ResultType = FD->getResultType(); 6758 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6759 !FD->isInvalidDecl() && 6760 RequireCompleteType(FD->getLocation(), ResultType, 6761 diag::err_func_def_incomplete_result)) 6762 FD->setInvalidDecl(); 6763 6764 // GNU warning -Wmissing-prototypes: 6765 // Warn if a global function is defined without a previous 6766 // prototype declaration. This warning is issued even if the 6767 // definition itself provides a prototype. The aim is to detect 6768 // global functions that fail to be declared in header files. 6769 if (ShouldWarnAboutMissingPrototype(FD)) 6770 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6771 6772 if (FnBodyScope) 6773 PushDeclContext(FnBodyScope, FD); 6774 6775 // Check the validity of our function parameters 6776 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6777 /*CheckParameterNames=*/true); 6778 6779 // Introduce our parameters into the function scope 6780 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6781 ParmVarDecl *Param = FD->getParamDecl(p); 6782 Param->setOwningFunction(FD); 6783 6784 // If this has an identifier, add it to the scope stack. 6785 if (Param->getIdentifier() && FnBodyScope) { 6786 CheckShadow(FnBodyScope, Param); 6787 6788 PushOnScopeChains(Param, FnBodyScope); 6789 } 6790 } 6791 6792 // Checking attributes of current function definition 6793 // dllimport attribute. 6794 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6795 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6796 // dllimport attribute cannot be directly applied to definition. 6797 // Microsoft accepts dllimport for functions defined within class scope. 6798 if (!DA->isInherited() && 6799 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 6800 Diag(FD->getLocation(), 6801 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6802 << "dllimport"; 6803 FD->setInvalidDecl(); 6804 return FD; 6805 } 6806 6807 // Visual C++ appears to not think this is an issue, so only issue 6808 // a warning when Microsoft extensions are disabled. 6809 if (!LangOpts.MicrosoftExt) { 6810 // If a symbol previously declared dllimport is later defined, the 6811 // attribute is ignored in subsequent references, and a warning is 6812 // emitted. 6813 Diag(FD->getLocation(), 6814 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6815 << FD->getName() << "dllimport"; 6816 } 6817 } 6818 return FD; 6819} 6820 6821/// \brief Given the set of return statements within a function body, 6822/// compute the variables that are subject to the named return value 6823/// optimization. 6824/// 6825/// Each of the variables that is subject to the named return value 6826/// optimization will be marked as NRVO variables in the AST, and any 6827/// return statement that has a marked NRVO variable as its NRVO candidate can 6828/// use the named return value optimization. 6829/// 6830/// This function applies a very simplistic algorithm for NRVO: if every return 6831/// statement in the function has the same NRVO candidate, that candidate is 6832/// the NRVO variable. 6833/// 6834/// FIXME: Employ a smarter algorithm that accounts for multiple return 6835/// statements and the lifetimes of the NRVO candidates. We should be able to 6836/// find a maximal set of NRVO variables. 6837void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6838 ReturnStmt **Returns = Scope->Returns.data(); 6839 6840 const VarDecl *NRVOCandidate = 0; 6841 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6842 if (!Returns[I]->getNRVOCandidate()) 6843 return; 6844 6845 if (!NRVOCandidate) 6846 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6847 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6848 return; 6849 } 6850 6851 if (NRVOCandidate) 6852 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6853} 6854 6855Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6856 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6857} 6858 6859Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6860 bool IsInstantiation) { 6861 FunctionDecl *FD = 0; 6862 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6863 if (FunTmpl) 6864 FD = FunTmpl->getTemplatedDecl(); 6865 else 6866 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6867 6868 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6869 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6870 6871 if (FD) { 6872 FD->setBody(Body); 6873 if (FD->isMain()) { 6874 // C and C++ allow for main to automagically return 0. 6875 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6876 FD->setHasImplicitReturnZero(true); 6877 WP.disableCheckFallThrough(); 6878 } else if (FD->hasAttr<NakedAttr>()) { 6879 // If the function is marked 'naked', don't complain about missing return 6880 // statements. 6881 WP.disableCheckFallThrough(); 6882 } 6883 6884 // MSVC permits the use of pure specifier (=0) on function definition, 6885 // defined at class scope, warn about this non standard construct. 6886 if (getLangOptions().MicrosoftExt && FD->isPure()) 6887 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6888 6889 if (!FD->isInvalidDecl()) { 6890 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6891 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6892 FD->getResultType(), FD); 6893 6894 // If this is a constructor, we need a vtable. 6895 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6896 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6897 6898 computeNRVO(Body, getCurFunction()); 6899 } 6900 6901 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6902 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6903 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6904 MD->setBody(Body); 6905 if (Body) 6906 MD->setEndLoc(Body->getLocEnd()); 6907 if (!MD->isInvalidDecl()) { 6908 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6909 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6910 MD->getResultType(), MD); 6911 6912 if (Body) 6913 computeNRVO(Body, getCurFunction()); 6914 } 6915 if (ObjCShouldCallSuperDealloc) { 6916 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 6917 ObjCShouldCallSuperDealloc = false; 6918 } 6919 if (ObjCShouldCallSuperFinalize) { 6920 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 6921 ObjCShouldCallSuperFinalize = false; 6922 } 6923 } else { 6924 return 0; 6925 } 6926 6927 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 6928 "ObjC methods, which should have been handled in the block above."); 6929 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 6930 "ObjC methods, which should have been handled in the block above."); 6931 6932 // Verify and clean out per-function state. 6933 if (Body) { 6934 // C++ constructors that have function-try-blocks can't have return 6935 // statements in the handlers of that block. (C++ [except.handle]p14) 6936 // Verify this. 6937 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6938 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6939 6940 // Verify that gotos and switch cases don't jump into scopes illegally. 6941 if (getCurFunction()->NeedsScopeChecking() && 6942 !dcl->isInvalidDecl() && 6943 !hasAnyUnrecoverableErrorsInThisFunction()) 6944 DiagnoseInvalidJumps(Body); 6945 6946 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6947 if (!Destructor->getParent()->isDependentType()) 6948 CheckDestructor(Destructor); 6949 6950 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6951 Destructor->getParent()); 6952 } 6953 6954 // If any errors have occurred, clear out any temporaries that may have 6955 // been leftover. This ensures that these temporaries won't be picked up for 6956 // deletion in some later function. 6957 if (PP.getDiagnostics().hasErrorOccurred() || 6958 PP.getDiagnostics().getSuppressAllDiagnostics()) { 6959 ExprTemporaries.clear(); 6960 ExprNeedsCleanups = false; 6961 } else if (!isa<FunctionTemplateDecl>(dcl)) { 6962 // Since the body is valid, issue any analysis-based warnings that are 6963 // enabled. 6964 ActivePolicy = &WP; 6965 } 6966 6967 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 6968 !CheckConstexprFunctionBody(FD, Body)) 6969 FD->setInvalidDecl(); 6970 6971 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6972 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 6973 } 6974 6975 if (!IsInstantiation) 6976 PopDeclContext(); 6977 6978 PopFunctionOrBlockScope(ActivePolicy, dcl); 6979 6980 // If any errors have occurred, clear out any temporaries that may have 6981 // been leftover. This ensures that these temporaries won't be picked up for 6982 // deletion in some later function. 6983 if (getDiagnostics().hasErrorOccurred()) { 6984 ExprTemporaries.clear(); 6985 ExprNeedsCleanups = false; 6986 } 6987 6988 return dcl; 6989} 6990 6991 6992/// When we finish delayed parsing of an attribute, we must attach it to the 6993/// relevant Decl. 6994void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 6995 ParsedAttributes &Attrs) { 6996 ProcessDeclAttributeList(S, D, Attrs.getList()); 6997} 6998 6999 7000/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7001/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7002NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7003 IdentifierInfo &II, Scope *S) { 7004 // Before we produce a declaration for an implicitly defined 7005 // function, see whether there was a locally-scoped declaration of 7006 // this name as a function or variable. If so, use that 7007 // (non-visible) declaration, and complain about it. 7008 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7009 = findLocallyScopedExternalDecl(&II); 7010 if (Pos != LocallyScopedExternalDecls.end()) { 7011 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7012 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7013 return Pos->second; 7014 } 7015 7016 // Extension in C99. Legal in C90, but warn about it. 7017 if (II.getName().startswith("__builtin_")) 7018 Diag(Loc, diag::warn_builtin_unknown) << &II; 7019 else if (getLangOptions().C99) 7020 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7021 else 7022 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7023 7024 // Set a Declarator for the implicit definition: int foo(); 7025 const char *Dummy; 7026 AttributeFactory attrFactory; 7027 DeclSpec DS(attrFactory); 7028 unsigned DiagID; 7029 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7030 (void)Error; // Silence warning. 7031 assert(!Error && "Error setting up implicit decl!"); 7032 Declarator D(DS, Declarator::BlockContext); 7033 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7034 0, 0, true, SourceLocation(), 7035 SourceLocation(), 7036 EST_None, SourceLocation(), 7037 0, 0, 0, 0, Loc, Loc, D), 7038 DS.getAttributes(), 7039 SourceLocation()); 7040 D.SetIdentifier(&II, Loc); 7041 7042 // Insert this function into translation-unit scope. 7043 7044 DeclContext *PrevDC = CurContext; 7045 CurContext = Context.getTranslationUnitDecl(); 7046 7047 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7048 FD->setImplicit(); 7049 7050 CurContext = PrevDC; 7051 7052 AddKnownFunctionAttributes(FD); 7053 7054 return FD; 7055} 7056 7057/// \brief Adds any function attributes that we know a priori based on 7058/// the declaration of this function. 7059/// 7060/// These attributes can apply both to implicitly-declared builtins 7061/// (like __builtin___printf_chk) or to library-declared functions 7062/// like NSLog or printf. 7063/// 7064/// We need to check for duplicate attributes both here and where user-written 7065/// attributes are applied to declarations. 7066void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7067 if (FD->isInvalidDecl()) 7068 return; 7069 7070 // If this is a built-in function, map its builtin attributes to 7071 // actual attributes. 7072 if (unsigned BuiltinID = FD->getBuiltinID()) { 7073 // Handle printf-formatting attributes. 7074 unsigned FormatIdx; 7075 bool HasVAListArg; 7076 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7077 if (!FD->getAttr<FormatAttr>()) 7078 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7079 "printf", FormatIdx+1, 7080 HasVAListArg ? 0 : FormatIdx+2)); 7081 } 7082 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7083 HasVAListArg)) { 7084 if (!FD->getAttr<FormatAttr>()) 7085 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7086 "scanf", FormatIdx+1, 7087 HasVAListArg ? 0 : FormatIdx+2)); 7088 } 7089 7090 // Mark const if we don't care about errno and that is the only 7091 // thing preventing the function from being const. This allows 7092 // IRgen to use LLVM intrinsics for such functions. 7093 if (!getLangOptions().MathErrno && 7094 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7095 if (!FD->getAttr<ConstAttr>()) 7096 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7097 } 7098 7099 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7100 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7101 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7102 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7103 } 7104 7105 IdentifierInfo *Name = FD->getIdentifier(); 7106 if (!Name) 7107 return; 7108 if ((!getLangOptions().CPlusPlus && 7109 FD->getDeclContext()->isTranslationUnit()) || 7110 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7111 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7112 LinkageSpecDecl::lang_c)) { 7113 // Okay: this could be a libc/libm/Objective-C function we know 7114 // about. 7115 } else 7116 return; 7117 7118 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7119 // FIXME: NSLog and NSLogv should be target specific 7120 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7121 // FIXME: We known better than our headers. 7122 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7123 } else 7124 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7125 "printf", 1, 7126 Name->isStr("NSLogv") ? 0 : 2)); 7127 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7128 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7129 // target-specific builtins, perhaps? 7130 if (!FD->getAttr<FormatAttr>()) 7131 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7132 "printf", 2, 7133 Name->isStr("vasprintf") ? 0 : 3)); 7134 } 7135} 7136 7137TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7138 TypeSourceInfo *TInfo) { 7139 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7140 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7141 7142 if (!TInfo) { 7143 assert(D.isInvalidType() && "no declarator info for valid type"); 7144 TInfo = Context.getTrivialTypeSourceInfo(T); 7145 } 7146 7147 // Scope manipulation handled by caller. 7148 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7149 D.getSourceRange().getBegin(), 7150 D.getIdentifierLoc(), 7151 D.getIdentifier(), 7152 TInfo); 7153 7154 // Bail out immediately if we have an invalid declaration. 7155 if (D.isInvalidType()) { 7156 NewTD->setInvalidDecl(); 7157 return NewTD; 7158 } 7159 7160 if (D.getDeclSpec().isModulePrivateSpecified()) { 7161 if (CurContext->isFunctionOrMethod()) 7162 Diag(NewTD->getLocation(), diag::err_module_private_local) 7163 << 2 << NewTD->getDeclName() 7164 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7165 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7166 else 7167 NewTD->setModulePrivate(); 7168 } 7169 7170 // C++ [dcl.typedef]p8: 7171 // If the typedef declaration defines an unnamed class (or 7172 // enum), the first typedef-name declared by the declaration 7173 // to be that class type (or enum type) is used to denote the 7174 // class type (or enum type) for linkage purposes only. 7175 // We need to check whether the type was declared in the declaration. 7176 switch (D.getDeclSpec().getTypeSpecType()) { 7177 case TST_enum: 7178 case TST_struct: 7179 case TST_union: 7180 case TST_class: { 7181 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7182 7183 // Do nothing if the tag is not anonymous or already has an 7184 // associated typedef (from an earlier typedef in this decl group). 7185 if (tagFromDeclSpec->getIdentifier()) break; 7186 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7187 7188 // A well-formed anonymous tag must always be a TUK_Definition. 7189 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7190 7191 // The type must match the tag exactly; no qualifiers allowed. 7192 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7193 break; 7194 7195 // Otherwise, set this is the anon-decl typedef for the tag. 7196 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7197 break; 7198 } 7199 7200 default: 7201 break; 7202 } 7203 7204 return NewTD; 7205} 7206 7207 7208/// \brief Determine whether a tag with a given kind is acceptable 7209/// as a redeclaration of the given tag declaration. 7210/// 7211/// \returns true if the new tag kind is acceptable, false otherwise. 7212bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7213 TagTypeKind NewTag, bool isDefinition, 7214 SourceLocation NewTagLoc, 7215 const IdentifierInfo &Name) { 7216 // C++ [dcl.type.elab]p3: 7217 // The class-key or enum keyword present in the 7218 // elaborated-type-specifier shall agree in kind with the 7219 // declaration to which the name in the elaborated-type-specifier 7220 // refers. This rule also applies to the form of 7221 // elaborated-type-specifier that declares a class-name or 7222 // friend class since it can be construed as referring to the 7223 // definition of the class. Thus, in any 7224 // elaborated-type-specifier, the enum keyword shall be used to 7225 // refer to an enumeration (7.2), the union class-key shall be 7226 // used to refer to a union (clause 9), and either the class or 7227 // struct class-key shall be used to refer to a class (clause 9) 7228 // declared using the class or struct class-key. 7229 TagTypeKind OldTag = Previous->getTagKind(); 7230 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7231 if (OldTag == NewTag) 7232 return true; 7233 7234 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7235 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7236 // Warn about the struct/class tag mismatch. 7237 bool isTemplate = false; 7238 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7239 isTemplate = Record->getDescribedClassTemplate(); 7240 7241 if (!ActiveTemplateInstantiations.empty()) { 7242 // In a template instantiation, do not offer fix-its for tag mismatches 7243 // since they usually mess up the template instead of fixing the problem. 7244 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7245 << (NewTag == TTK_Class) << isTemplate << &Name; 7246 return true; 7247 } 7248 7249 if (isDefinition) { 7250 // On definitions, check previous tags and issue a fix-it for each 7251 // one that doesn't match the current tag. 7252 if (Previous->getDefinition()) { 7253 // Don't suggest fix-its for redefinitions. 7254 return true; 7255 } 7256 7257 bool previousMismatch = false; 7258 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7259 E(Previous->redecls_end()); I != E; ++I) { 7260 if (I->getTagKind() != NewTag) { 7261 if (!previousMismatch) { 7262 previousMismatch = true; 7263 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7264 << (NewTag == TTK_Class) << isTemplate << &Name; 7265 } 7266 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7267 << (NewTag == TTK_Class) 7268 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7269 NewTag == TTK_Class? 7270 "class" : "struct"); 7271 } 7272 } 7273 return true; 7274 } 7275 7276 // Check for a previous definition. If current tag and definition 7277 // are same type, do nothing. If no definition, but disagree with 7278 // with previous tag type, give a warning, but no fix-it. 7279 const TagDecl *Redecl = Previous->getDefinition() ? 7280 Previous->getDefinition() : Previous; 7281 if (Redecl->getTagKind() == NewTag) { 7282 return true; 7283 } 7284 7285 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7286 << (NewTag == TTK_Class) 7287 << isTemplate << &Name; 7288 Diag(Redecl->getLocation(), diag::note_previous_use); 7289 7290 // If there is a previous defintion, suggest a fix-it. 7291 if (Previous->getDefinition()) { 7292 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7293 << (Redecl->getTagKind() == TTK_Class) 7294 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7295 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7296 } 7297 7298 return true; 7299 } 7300 return false; 7301} 7302 7303/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7304/// former case, Name will be non-null. In the later case, Name will be null. 7305/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7306/// reference/declaration/definition of a tag. 7307Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7308 SourceLocation KWLoc, CXXScopeSpec &SS, 7309 IdentifierInfo *Name, SourceLocation NameLoc, 7310 AttributeList *Attr, AccessSpecifier AS, 7311 SourceLocation ModulePrivateLoc, 7312 MultiTemplateParamsArg TemplateParameterLists, 7313 bool &OwnedDecl, bool &IsDependent, 7314 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7315 TypeResult UnderlyingType) { 7316 // If this is not a definition, it must have a name. 7317 assert((Name != 0 || TUK == TUK_Definition) && 7318 "Nameless record must be a definition!"); 7319 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7320 7321 OwnedDecl = false; 7322 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7323 7324 // FIXME: Check explicit specializations more carefully. 7325 bool isExplicitSpecialization = false; 7326 bool Invalid = false; 7327 7328 // We only need to do this matching if we have template parameters 7329 // or a scope specifier, which also conveniently avoids this work 7330 // for non-C++ cases. 7331 if (TemplateParameterLists.size() > 0 || 7332 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7333 if (TemplateParameterList *TemplateParams 7334 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7335 TemplateParameterLists.get(), 7336 TemplateParameterLists.size(), 7337 TUK == TUK_Friend, 7338 isExplicitSpecialization, 7339 Invalid)) { 7340 if (TemplateParams->size() > 0) { 7341 // This is a declaration or definition of a class template (which may 7342 // be a member of another template). 7343 7344 if (Invalid) 7345 return 0; 7346 7347 OwnedDecl = false; 7348 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7349 SS, Name, NameLoc, Attr, 7350 TemplateParams, AS, 7351 ModulePrivateLoc, 7352 TemplateParameterLists.size() - 1, 7353 (TemplateParameterList**) TemplateParameterLists.release()); 7354 return Result.get(); 7355 } else { 7356 // The "template<>" header is extraneous. 7357 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7358 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7359 isExplicitSpecialization = true; 7360 } 7361 } 7362 } 7363 7364 // Figure out the underlying type if this a enum declaration. We need to do 7365 // this early, because it's needed to detect if this is an incompatible 7366 // redeclaration. 7367 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7368 7369 if (Kind == TTK_Enum) { 7370 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7371 // No underlying type explicitly specified, or we failed to parse the 7372 // type, default to int. 7373 EnumUnderlying = Context.IntTy.getTypePtr(); 7374 else if (UnderlyingType.get()) { 7375 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7376 // integral type; any cv-qualification is ignored. 7377 TypeSourceInfo *TI = 0; 7378 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7379 EnumUnderlying = TI; 7380 7381 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7382 7383 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7384 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7385 << T; 7386 // Recover by falling back to int. 7387 EnumUnderlying = Context.IntTy.getTypePtr(); 7388 } 7389 7390 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7391 UPPC_FixedUnderlyingType)) 7392 EnumUnderlying = Context.IntTy.getTypePtr(); 7393 7394 } else if (getLangOptions().MicrosoftExt) 7395 // Microsoft enums are always of int type. 7396 EnumUnderlying = Context.IntTy.getTypePtr(); 7397 } 7398 7399 DeclContext *SearchDC = CurContext; 7400 DeclContext *DC = CurContext; 7401 bool isStdBadAlloc = false; 7402 7403 RedeclarationKind Redecl = ForRedeclaration; 7404 if (TUK == TUK_Friend || TUK == TUK_Reference) 7405 Redecl = NotForRedeclaration; 7406 7407 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7408 7409 if (Name && SS.isNotEmpty()) { 7410 // We have a nested-name tag ('struct foo::bar'). 7411 7412 // Check for invalid 'foo::'. 7413 if (SS.isInvalid()) { 7414 Name = 0; 7415 goto CreateNewDecl; 7416 } 7417 7418 // If this is a friend or a reference to a class in a dependent 7419 // context, don't try to make a decl for it. 7420 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7421 DC = computeDeclContext(SS, false); 7422 if (!DC) { 7423 IsDependent = true; 7424 return 0; 7425 } 7426 } else { 7427 DC = computeDeclContext(SS, true); 7428 if (!DC) { 7429 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7430 << SS.getRange(); 7431 return 0; 7432 } 7433 } 7434 7435 if (RequireCompleteDeclContext(SS, DC)) 7436 return 0; 7437 7438 SearchDC = DC; 7439 // Look-up name inside 'foo::'. 7440 LookupQualifiedName(Previous, DC); 7441 7442 if (Previous.isAmbiguous()) 7443 return 0; 7444 7445 if (Previous.empty()) { 7446 // Name lookup did not find anything. However, if the 7447 // nested-name-specifier refers to the current instantiation, 7448 // and that current instantiation has any dependent base 7449 // classes, we might find something at instantiation time: treat 7450 // this as a dependent elaborated-type-specifier. 7451 // But this only makes any sense for reference-like lookups. 7452 if (Previous.wasNotFoundInCurrentInstantiation() && 7453 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7454 IsDependent = true; 7455 return 0; 7456 } 7457 7458 // A tag 'foo::bar' must already exist. 7459 Diag(NameLoc, diag::err_not_tag_in_scope) 7460 << Kind << Name << DC << SS.getRange(); 7461 Name = 0; 7462 Invalid = true; 7463 goto CreateNewDecl; 7464 } 7465 } else if (Name) { 7466 // If this is a named struct, check to see if there was a previous forward 7467 // declaration or definition. 7468 // FIXME: We're looking into outer scopes here, even when we 7469 // shouldn't be. Doing so can result in ambiguities that we 7470 // shouldn't be diagnosing. 7471 LookupName(Previous, S); 7472 7473 if (Previous.isAmbiguous() && 7474 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7475 LookupResult::Filter F = Previous.makeFilter(); 7476 while (F.hasNext()) { 7477 NamedDecl *ND = F.next(); 7478 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7479 F.erase(); 7480 } 7481 F.done(); 7482 } 7483 7484 // Note: there used to be some attempt at recovery here. 7485 if (Previous.isAmbiguous()) 7486 return 0; 7487 7488 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7489 // FIXME: This makes sure that we ignore the contexts associated 7490 // with C structs, unions, and enums when looking for a matching 7491 // tag declaration or definition. See the similar lookup tweak 7492 // in Sema::LookupName; is there a better way to deal with this? 7493 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7494 SearchDC = SearchDC->getParent(); 7495 } 7496 } else if (S->isFunctionPrototypeScope()) { 7497 // If this is an enum declaration in function prototype scope, set its 7498 // initial context to the translation unit. 7499 SearchDC = Context.getTranslationUnitDecl(); 7500 } 7501 7502 if (Previous.isSingleResult() && 7503 Previous.getFoundDecl()->isTemplateParameter()) { 7504 // Maybe we will complain about the shadowed template parameter. 7505 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7506 // Just pretend that we didn't see the previous declaration. 7507 Previous.clear(); 7508 } 7509 7510 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7511 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7512 // This is a declaration of or a reference to "std::bad_alloc". 7513 isStdBadAlloc = true; 7514 7515 if (Previous.empty() && StdBadAlloc) { 7516 // std::bad_alloc has been implicitly declared (but made invisible to 7517 // name lookup). Fill in this implicit declaration as the previous 7518 // declaration, so that the declarations get chained appropriately. 7519 Previous.addDecl(getStdBadAlloc()); 7520 } 7521 } 7522 7523 // If we didn't find a previous declaration, and this is a reference 7524 // (or friend reference), move to the correct scope. In C++, we 7525 // also need to do a redeclaration lookup there, just in case 7526 // there's a shadow friend decl. 7527 if (Name && Previous.empty() && 7528 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7529 if (Invalid) goto CreateNewDecl; 7530 assert(SS.isEmpty()); 7531 7532 if (TUK == TUK_Reference) { 7533 // C++ [basic.scope.pdecl]p5: 7534 // -- for an elaborated-type-specifier of the form 7535 // 7536 // class-key identifier 7537 // 7538 // if the elaborated-type-specifier is used in the 7539 // decl-specifier-seq or parameter-declaration-clause of a 7540 // function defined in namespace scope, the identifier is 7541 // declared as a class-name in the namespace that contains 7542 // the declaration; otherwise, except as a friend 7543 // declaration, the identifier is declared in the smallest 7544 // non-class, non-function-prototype scope that contains the 7545 // declaration. 7546 // 7547 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7548 // C structs and unions. 7549 // 7550 // It is an error in C++ to declare (rather than define) an enum 7551 // type, including via an elaborated type specifier. We'll 7552 // diagnose that later; for now, declare the enum in the same 7553 // scope as we would have picked for any other tag type. 7554 // 7555 // GNU C also supports this behavior as part of its incomplete 7556 // enum types extension, while GNU C++ does not. 7557 // 7558 // Find the context where we'll be declaring the tag. 7559 // FIXME: We would like to maintain the current DeclContext as the 7560 // lexical context, 7561 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7562 SearchDC = SearchDC->getParent(); 7563 7564 // Find the scope where we'll be declaring the tag. 7565 while (S->isClassScope() || 7566 (getLangOptions().CPlusPlus && 7567 S->isFunctionPrototypeScope()) || 7568 ((S->getFlags() & Scope::DeclScope) == 0) || 7569 (S->getEntity() && 7570 ((DeclContext *)S->getEntity())->isTransparentContext())) 7571 S = S->getParent(); 7572 } else { 7573 assert(TUK == TUK_Friend); 7574 // C++ [namespace.memdef]p3: 7575 // If a friend declaration in a non-local class first declares a 7576 // class or function, the friend class or function is a member of 7577 // the innermost enclosing namespace. 7578 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7579 } 7580 7581 // In C++, we need to do a redeclaration lookup to properly 7582 // diagnose some problems. 7583 if (getLangOptions().CPlusPlus) { 7584 Previous.setRedeclarationKind(ForRedeclaration); 7585 LookupQualifiedName(Previous, SearchDC); 7586 } 7587 } 7588 7589 if (!Previous.empty()) { 7590 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7591 7592 // It's okay to have a tag decl in the same scope as a typedef 7593 // which hides a tag decl in the same scope. Finding this 7594 // insanity with a redeclaration lookup can only actually happen 7595 // in C++. 7596 // 7597 // This is also okay for elaborated-type-specifiers, which is 7598 // technically forbidden by the current standard but which is 7599 // okay according to the likely resolution of an open issue; 7600 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7601 if (getLangOptions().CPlusPlus) { 7602 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7603 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7604 TagDecl *Tag = TT->getDecl(); 7605 if (Tag->getDeclName() == Name && 7606 Tag->getDeclContext()->getRedeclContext() 7607 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7608 PrevDecl = Tag; 7609 Previous.clear(); 7610 Previous.addDecl(Tag); 7611 Previous.resolveKind(); 7612 } 7613 } 7614 } 7615 } 7616 7617 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7618 // If this is a use of a previous tag, or if the tag is already declared 7619 // in the same scope (so that the definition/declaration completes or 7620 // rementions the tag), reuse the decl. 7621 if (TUK == TUK_Reference || TUK == TUK_Friend || 7622 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7623 // Make sure that this wasn't declared as an enum and now used as a 7624 // struct or something similar. 7625 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7626 TUK == TUK_Definition, KWLoc, 7627 *Name)) { 7628 bool SafeToContinue 7629 = (PrevTagDecl->getTagKind() != TTK_Enum && 7630 Kind != TTK_Enum); 7631 if (SafeToContinue) 7632 Diag(KWLoc, diag::err_use_with_wrong_tag) 7633 << Name 7634 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7635 PrevTagDecl->getKindName()); 7636 else 7637 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7638 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7639 7640 if (SafeToContinue) 7641 Kind = PrevTagDecl->getTagKind(); 7642 else { 7643 // Recover by making this an anonymous redefinition. 7644 Name = 0; 7645 Previous.clear(); 7646 Invalid = true; 7647 } 7648 } 7649 7650 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7651 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7652 7653 // All conflicts with previous declarations are recovered by 7654 // returning the previous declaration. 7655 if (ScopedEnum != PrevEnum->isScoped()) { 7656 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7657 << PrevEnum->isScoped(); 7658 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7659 return PrevTagDecl; 7660 } 7661 else if (EnumUnderlying && PrevEnum->isFixed()) { 7662 QualType T; 7663 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7664 T = TI->getType(); 7665 else 7666 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7667 7668 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7669 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7670 diag::err_enum_redeclare_type_mismatch) 7671 << T 7672 << PrevEnum->getIntegerType(); 7673 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7674 return PrevTagDecl; 7675 } 7676 } 7677 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7678 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7679 << PrevEnum->isFixed(); 7680 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7681 return PrevTagDecl; 7682 } 7683 } 7684 7685 if (!Invalid) { 7686 // If this is a use, just return the declaration we found. 7687 7688 // FIXME: In the future, return a variant or some other clue 7689 // for the consumer of this Decl to know it doesn't own it. 7690 // For our current ASTs this shouldn't be a problem, but will 7691 // need to be changed with DeclGroups. 7692 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7693 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7694 return PrevTagDecl; 7695 7696 // Diagnose attempts to redefine a tag. 7697 if (TUK == TUK_Definition) { 7698 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7699 // If we're defining a specialization and the previous definition 7700 // is from an implicit instantiation, don't emit an error 7701 // here; we'll catch this in the general case below. 7702 if (!isExplicitSpecialization || 7703 !isa<CXXRecordDecl>(Def) || 7704 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7705 == TSK_ExplicitSpecialization) { 7706 Diag(NameLoc, diag::err_redefinition) << Name; 7707 Diag(Def->getLocation(), diag::note_previous_definition); 7708 // If this is a redefinition, recover by making this 7709 // struct be anonymous, which will make any later 7710 // references get the previous definition. 7711 Name = 0; 7712 Previous.clear(); 7713 Invalid = true; 7714 } 7715 } else { 7716 // If the type is currently being defined, complain 7717 // about a nested redefinition. 7718 const TagType *Tag 7719 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7720 if (Tag->isBeingDefined()) { 7721 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7722 Diag(PrevTagDecl->getLocation(), 7723 diag::note_previous_definition); 7724 Name = 0; 7725 Previous.clear(); 7726 Invalid = true; 7727 } 7728 } 7729 7730 // Okay, this is definition of a previously declared or referenced 7731 // tag PrevDecl. We're going to create a new Decl for it. 7732 } 7733 } 7734 // If we get here we have (another) forward declaration or we 7735 // have a definition. Just create a new decl. 7736 7737 } else { 7738 // If we get here, this is a definition of a new tag type in a nested 7739 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7740 // new decl/type. We set PrevDecl to NULL so that the entities 7741 // have distinct types. 7742 Previous.clear(); 7743 } 7744 // If we get here, we're going to create a new Decl. If PrevDecl 7745 // is non-NULL, it's a definition of the tag declared by 7746 // PrevDecl. If it's NULL, we have a new definition. 7747 7748 7749 // Otherwise, PrevDecl is not a tag, but was found with tag 7750 // lookup. This is only actually possible in C++, where a few 7751 // things like templates still live in the tag namespace. 7752 } else { 7753 assert(getLangOptions().CPlusPlus); 7754 7755 // Use a better diagnostic if an elaborated-type-specifier 7756 // found the wrong kind of type on the first 7757 // (non-redeclaration) lookup. 7758 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7759 !Previous.isForRedeclaration()) { 7760 unsigned Kind = 0; 7761 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7762 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7763 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7764 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7765 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7766 Invalid = true; 7767 7768 // Otherwise, only diagnose if the declaration is in scope. 7769 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7770 isExplicitSpecialization)) { 7771 // do nothing 7772 7773 // Diagnose implicit declarations introduced by elaborated types. 7774 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7775 unsigned Kind = 0; 7776 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7777 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7778 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7779 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7780 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7781 Invalid = true; 7782 7783 // Otherwise it's a declaration. Call out a particularly common 7784 // case here. 7785 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7786 unsigned Kind = 0; 7787 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7788 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7789 << Name << Kind << TND->getUnderlyingType(); 7790 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7791 Invalid = true; 7792 7793 // Otherwise, diagnose. 7794 } else { 7795 // The tag name clashes with something else in the target scope, 7796 // issue an error and recover by making this tag be anonymous. 7797 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7798 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7799 Name = 0; 7800 Invalid = true; 7801 } 7802 7803 // The existing declaration isn't relevant to us; we're in a 7804 // new scope, so clear out the previous declaration. 7805 Previous.clear(); 7806 } 7807 } 7808 7809CreateNewDecl: 7810 7811 TagDecl *PrevDecl = 0; 7812 if (Previous.isSingleResult()) 7813 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7814 7815 // If there is an identifier, use the location of the identifier as the 7816 // location of the decl, otherwise use the location of the struct/union 7817 // keyword. 7818 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7819 7820 // Otherwise, create a new declaration. If there is a previous 7821 // declaration of the same entity, the two will be linked via 7822 // PrevDecl. 7823 TagDecl *New; 7824 7825 bool IsForwardReference = false; 7826 if (Kind == TTK_Enum) { 7827 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7828 // enum X { A, B, C } D; D should chain to X. 7829 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7830 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7831 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7832 // If this is an undefined enum, warn. 7833 if (TUK != TUK_Definition && !Invalid) { 7834 TagDecl *Def; 7835 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7836 // C++0x: 7.2p2: opaque-enum-declaration. 7837 // Conflicts are diagnosed above. Do nothing. 7838 } 7839 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7840 Diag(Loc, diag::ext_forward_ref_enum_def) 7841 << New; 7842 Diag(Def->getLocation(), diag::note_previous_definition); 7843 } else { 7844 unsigned DiagID = diag::ext_forward_ref_enum; 7845 if (getLangOptions().MicrosoftExt) 7846 DiagID = diag::ext_ms_forward_ref_enum; 7847 else if (getLangOptions().CPlusPlus) 7848 DiagID = diag::err_forward_ref_enum; 7849 Diag(Loc, DiagID); 7850 7851 // If this is a forward-declared reference to an enumeration, make a 7852 // note of it; we won't actually be introducing the declaration into 7853 // the declaration context. 7854 if (TUK == TUK_Reference) 7855 IsForwardReference = true; 7856 } 7857 } 7858 7859 if (EnumUnderlying) { 7860 EnumDecl *ED = cast<EnumDecl>(New); 7861 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7862 ED->setIntegerTypeSourceInfo(TI); 7863 else 7864 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7865 ED->setPromotionType(ED->getIntegerType()); 7866 } 7867 7868 } else { 7869 // struct/union/class 7870 7871 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7872 // struct X { int A; } D; D should chain to X. 7873 if (getLangOptions().CPlusPlus) { 7874 // FIXME: Look for a way to use RecordDecl for simple structs. 7875 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7876 cast_or_null<CXXRecordDecl>(PrevDecl)); 7877 7878 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7879 StdBadAlloc = cast<CXXRecordDecl>(New); 7880 } else 7881 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7882 cast_or_null<RecordDecl>(PrevDecl)); 7883 } 7884 7885 // Maybe add qualifier info. 7886 if (SS.isNotEmpty()) { 7887 if (SS.isSet()) { 7888 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7889 if (TemplateParameterLists.size() > 0) { 7890 New->setTemplateParameterListsInfo(Context, 7891 TemplateParameterLists.size(), 7892 (TemplateParameterList**) TemplateParameterLists.release()); 7893 } 7894 } 7895 else 7896 Invalid = true; 7897 } 7898 7899 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7900 // Add alignment attributes if necessary; these attributes are checked when 7901 // the ASTContext lays out the structure. 7902 // 7903 // It is important for implementing the correct semantics that this 7904 // happen here (in act on tag decl). The #pragma pack stack is 7905 // maintained as a result of parser callbacks which can occur at 7906 // many points during the parsing of a struct declaration (because 7907 // the #pragma tokens are effectively skipped over during the 7908 // parsing of the struct). 7909 AddAlignmentAttributesForRecord(RD); 7910 7911 AddMsStructLayoutForRecord(RD); 7912 } 7913 7914 if (PrevDecl && PrevDecl->isModulePrivate()) 7915 New->setModulePrivate(); 7916 else if (ModulePrivateLoc.isValid()) { 7917 if (isExplicitSpecialization) 7918 Diag(New->getLocation(), diag::err_module_private_specialization) 7919 << 2 7920 << FixItHint::CreateRemoval(ModulePrivateLoc); 7921 else if (PrevDecl && !PrevDecl->isModulePrivate()) 7922 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 7923 // __module_private__ does not apply to local classes. However, we only 7924 // diagnose this as an error when the declaration specifiers are 7925 // freestanding. Here, we just ignore the __module_private__. 7926 // foobar 7927 else if (!SearchDC->isFunctionOrMethod()) 7928 New->setModulePrivate(); 7929 } 7930 7931 // If this is a specialization of a member class (of a class template), 7932 // check the specialization. 7933 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7934 Invalid = true; 7935 7936 if (Invalid) 7937 New->setInvalidDecl(); 7938 7939 if (Attr) 7940 ProcessDeclAttributeList(S, New, Attr); 7941 7942 // If we're declaring or defining a tag in function prototype scope 7943 // in C, note that this type can only be used within the function. 7944 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7945 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7946 7947 // Set the lexical context. If the tag has a C++ scope specifier, the 7948 // lexical context will be different from the semantic context. 7949 New->setLexicalDeclContext(CurContext); 7950 7951 // Mark this as a friend decl if applicable. 7952 // In Microsoft mode, a friend declaration also acts as a forward 7953 // declaration so we always pass true to setObjectOfFriendDecl to make 7954 // the tag name visible. 7955 if (TUK == TUK_Friend) 7956 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 7957 getLangOptions().MicrosoftExt); 7958 7959 // Set the access specifier. 7960 if (!Invalid && SearchDC->isRecord()) 7961 SetMemberAccessSpecifier(New, PrevDecl, AS); 7962 7963 if (TUK == TUK_Definition) 7964 New->startDefinition(); 7965 7966 // If this has an identifier, add it to the scope stack. 7967 if (TUK == TUK_Friend) { 7968 // We might be replacing an existing declaration in the lookup tables; 7969 // if so, borrow its access specifier. 7970 if (PrevDecl) 7971 New->setAccess(PrevDecl->getAccess()); 7972 7973 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7974 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7975 if (Name) // can be null along some error paths 7976 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7977 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7978 } else if (Name) { 7979 S = getNonFieldDeclScope(S); 7980 PushOnScopeChains(New, S, !IsForwardReference); 7981 if (IsForwardReference) 7982 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7983 7984 } else { 7985 CurContext->addDecl(New); 7986 } 7987 7988 // If this is the C FILE type, notify the AST context. 7989 if (IdentifierInfo *II = New->getIdentifier()) 7990 if (!New->isInvalidDecl() && 7991 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7992 II->isStr("FILE")) 7993 Context.setFILEDecl(New); 7994 7995 OwnedDecl = true; 7996 return New; 7997} 7998 7999void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8000 AdjustDeclIfTemplate(TagD); 8001 TagDecl *Tag = cast<TagDecl>(TagD); 8002 8003 // Enter the tag context. 8004 PushDeclContext(S, Tag); 8005} 8006 8007void Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8008 assert(isa<ObjCContainerDecl>(IDecl) && 8009 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8010 DeclContext *OCD = cast<DeclContext>(IDecl); 8011 assert(getContainingDC(OCD) == CurContext && 8012 "The next DeclContext should be lexically contained in the current one."); 8013 CurContext = OCD; 8014} 8015 8016void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8017 SourceLocation FinalLoc, 8018 SourceLocation LBraceLoc) { 8019 AdjustDeclIfTemplate(TagD); 8020 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8021 8022 FieldCollector->StartClass(); 8023 8024 if (!Record->getIdentifier()) 8025 return; 8026 8027 if (FinalLoc.isValid()) 8028 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8029 8030 // C++ [class]p2: 8031 // [...] The class-name is also inserted into the scope of the 8032 // class itself; this is known as the injected-class-name. For 8033 // purposes of access checking, the injected-class-name is treated 8034 // as if it were a public member name. 8035 CXXRecordDecl *InjectedClassName 8036 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8037 Record->getLocStart(), Record->getLocation(), 8038 Record->getIdentifier(), 8039 /*PrevDecl=*/0, 8040 /*DelayTypeCreation=*/true); 8041 Context.getTypeDeclType(InjectedClassName, Record); 8042 InjectedClassName->setImplicit(); 8043 InjectedClassName->setAccess(AS_public); 8044 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8045 InjectedClassName->setDescribedClassTemplate(Template); 8046 PushOnScopeChains(InjectedClassName, S); 8047 assert(InjectedClassName->isInjectedClassName() && 8048 "Broken injected-class-name"); 8049} 8050 8051void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8052 SourceLocation RBraceLoc) { 8053 AdjustDeclIfTemplate(TagD); 8054 TagDecl *Tag = cast<TagDecl>(TagD); 8055 Tag->setRBraceLoc(RBraceLoc); 8056 8057 if (isa<CXXRecordDecl>(Tag)) 8058 FieldCollector->FinishClass(); 8059 8060 // Exit this scope of this tag's definition. 8061 PopDeclContext(); 8062 8063 // Notify the consumer that we've defined a tag. 8064 Consumer.HandleTagDeclDefinition(Tag); 8065} 8066 8067void Sema::ActOnObjCContainerFinishDefinition() { 8068 // Exit this scope of this interface definition. 8069 PopDeclContext(); 8070} 8071 8072void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8073 AdjustDeclIfTemplate(TagD); 8074 TagDecl *Tag = cast<TagDecl>(TagD); 8075 Tag->setInvalidDecl(); 8076 8077 // We're undoing ActOnTagStartDefinition here, not 8078 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8079 // the FieldCollector. 8080 8081 PopDeclContext(); 8082} 8083 8084// Note that FieldName may be null for anonymous bitfields. 8085bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8086 QualType FieldTy, const Expr *BitWidth, 8087 bool *ZeroWidth) { 8088 // Default to true; that shouldn't confuse checks for emptiness 8089 if (ZeroWidth) 8090 *ZeroWidth = true; 8091 8092 // C99 6.7.2.1p4 - verify the field type. 8093 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8094 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8095 // Handle incomplete types with specific error. 8096 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8097 return true; 8098 if (FieldName) 8099 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8100 << FieldName << FieldTy << BitWidth->getSourceRange(); 8101 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8102 << FieldTy << BitWidth->getSourceRange(); 8103 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8104 UPPC_BitFieldWidth)) 8105 return true; 8106 8107 // If the bit-width is type- or value-dependent, don't try to check 8108 // it now. 8109 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8110 return false; 8111 8112 llvm::APSInt Value; 8113 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8114 return true; 8115 8116 if (Value != 0 && ZeroWidth) 8117 *ZeroWidth = false; 8118 8119 // Zero-width bitfield is ok for anonymous field. 8120 if (Value == 0 && FieldName) 8121 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8122 8123 if (Value.isSigned() && Value.isNegative()) { 8124 if (FieldName) 8125 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8126 << FieldName << Value.toString(10); 8127 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8128 << Value.toString(10); 8129 } 8130 8131 if (!FieldTy->isDependentType()) { 8132 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8133 if (Value.getZExtValue() > TypeSize) { 8134 if (!getLangOptions().CPlusPlus) { 8135 if (FieldName) 8136 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8137 << FieldName << (unsigned)Value.getZExtValue() 8138 << (unsigned)TypeSize; 8139 8140 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8141 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8142 } 8143 8144 if (FieldName) 8145 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8146 << FieldName << (unsigned)Value.getZExtValue() 8147 << (unsigned)TypeSize; 8148 else 8149 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8150 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8151 } 8152 } 8153 8154 return false; 8155} 8156 8157/// ActOnField - Each field of a C struct/union is passed into this in order 8158/// to create a FieldDecl object for it. 8159Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8160 Declarator &D, Expr *BitfieldWidth) { 8161 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8162 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8163 /*HasInit=*/false, AS_public); 8164 return Res; 8165} 8166 8167/// HandleField - Analyze a field of a C struct or a C++ data member. 8168/// 8169FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8170 SourceLocation DeclStart, 8171 Declarator &D, Expr *BitWidth, bool HasInit, 8172 AccessSpecifier AS) { 8173 IdentifierInfo *II = D.getIdentifier(); 8174 SourceLocation Loc = DeclStart; 8175 if (II) Loc = D.getIdentifierLoc(); 8176 8177 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8178 QualType T = TInfo->getType(); 8179 if (getLangOptions().CPlusPlus) { 8180 CheckExtraCXXDefaultArguments(D); 8181 8182 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8183 UPPC_DataMemberType)) { 8184 D.setInvalidType(); 8185 T = Context.IntTy; 8186 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8187 } 8188 } 8189 8190 DiagnoseFunctionSpecifiers(D); 8191 8192 if (D.getDeclSpec().isThreadSpecified()) 8193 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8194 if (D.getDeclSpec().isConstexprSpecified()) 8195 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8196 << 2; 8197 8198 // Check to see if this name was declared as a member previously 8199 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8200 LookupName(Previous, S); 8201 assert((Previous.empty() || Previous.isOverloadedResult() || 8202 Previous.isSingleResult()) 8203 && "Lookup of member name should be either overloaded, single or null"); 8204 8205 // If the name is overloaded then get any declaration else get the single result 8206 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 8207 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 8208 8209 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8210 // Maybe we will complain about the shadowed template parameter. 8211 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8212 // Just pretend that we didn't see the previous declaration. 8213 PrevDecl = 0; 8214 } 8215 8216 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8217 PrevDecl = 0; 8218 8219 bool Mutable 8220 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8221 SourceLocation TSSL = D.getSourceRange().getBegin(); 8222 FieldDecl *NewFD 8223 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8224 TSSL, AS, PrevDecl, &D); 8225 8226 if (NewFD->isInvalidDecl()) 8227 Record->setInvalidDecl(); 8228 8229 if (D.getDeclSpec().isModulePrivateSpecified()) 8230 NewFD->setModulePrivate(); 8231 8232 if (NewFD->isInvalidDecl() && PrevDecl) { 8233 // Don't introduce NewFD into scope; there's already something 8234 // with the same name in the same scope. 8235 } else if (II) { 8236 PushOnScopeChains(NewFD, S); 8237 } else 8238 Record->addDecl(NewFD); 8239 8240 return NewFD; 8241} 8242 8243/// \brief Build a new FieldDecl and check its well-formedness. 8244/// 8245/// This routine builds a new FieldDecl given the fields name, type, 8246/// record, etc. \p PrevDecl should refer to any previous declaration 8247/// with the same name and in the same scope as the field to be 8248/// created. 8249/// 8250/// \returns a new FieldDecl. 8251/// 8252/// \todo The Declarator argument is a hack. It will be removed once 8253FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8254 TypeSourceInfo *TInfo, 8255 RecordDecl *Record, SourceLocation Loc, 8256 bool Mutable, Expr *BitWidth, bool HasInit, 8257 SourceLocation TSSL, 8258 AccessSpecifier AS, NamedDecl *PrevDecl, 8259 Declarator *D) { 8260 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8261 bool InvalidDecl = false; 8262 if (D) InvalidDecl = D->isInvalidType(); 8263 8264 // If we receive a broken type, recover by assuming 'int' and 8265 // marking this declaration as invalid. 8266 if (T.isNull()) { 8267 InvalidDecl = true; 8268 T = Context.IntTy; 8269 } 8270 8271 QualType EltTy = Context.getBaseElementType(T); 8272 if (!EltTy->isDependentType() && 8273 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8274 // Fields of incomplete type force their record to be invalid. 8275 Record->setInvalidDecl(); 8276 InvalidDecl = true; 8277 } 8278 8279 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8280 // than a variably modified type. 8281 if (!InvalidDecl && T->isVariablyModifiedType()) { 8282 bool SizeIsNegative; 8283 llvm::APSInt Oversized; 8284 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8285 SizeIsNegative, 8286 Oversized); 8287 if (!FixedTy.isNull()) { 8288 Diag(Loc, diag::warn_illegal_constant_array_size); 8289 T = FixedTy; 8290 } else { 8291 if (SizeIsNegative) 8292 Diag(Loc, diag::err_typecheck_negative_array_size); 8293 else if (Oversized.getBoolValue()) 8294 Diag(Loc, diag::err_array_too_large) 8295 << Oversized.toString(10); 8296 else 8297 Diag(Loc, diag::err_typecheck_field_variable_size); 8298 InvalidDecl = true; 8299 } 8300 } 8301 8302 // Fields can not have abstract class types 8303 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8304 diag::err_abstract_type_in_decl, 8305 AbstractFieldType)) 8306 InvalidDecl = true; 8307 8308 bool ZeroWidth = false; 8309 // If this is declared as a bit-field, check the bit-field. 8310 if (!InvalidDecl && BitWidth && 8311 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8312 InvalidDecl = true; 8313 BitWidth = 0; 8314 ZeroWidth = false; 8315 } 8316 8317 // Check that 'mutable' is consistent with the type of the declaration. 8318 if (!InvalidDecl && Mutable) { 8319 unsigned DiagID = 0; 8320 if (T->isReferenceType()) 8321 DiagID = diag::err_mutable_reference; 8322 else if (T.isConstQualified()) 8323 DiagID = diag::err_mutable_const; 8324 8325 if (DiagID) { 8326 SourceLocation ErrLoc = Loc; 8327 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8328 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8329 Diag(ErrLoc, DiagID); 8330 Mutable = false; 8331 InvalidDecl = true; 8332 } 8333 } 8334 8335 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8336 BitWidth, Mutable, HasInit); 8337 if (InvalidDecl) 8338 NewFD->setInvalidDecl(); 8339 8340 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8341 Diag(Loc, diag::err_duplicate_member) << II; 8342 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8343 NewFD->setInvalidDecl(); 8344 } 8345 8346 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8347 if (Record->isUnion()) { 8348 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8349 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8350 if (RDecl->getDefinition()) { 8351 // C++ [class.union]p1: An object of a class with a non-trivial 8352 // constructor, a non-trivial copy constructor, a non-trivial 8353 // destructor, or a non-trivial copy assignment operator 8354 // cannot be a member of a union, nor can an array of such 8355 // objects. 8356 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 8357 NewFD->setInvalidDecl(); 8358 } 8359 } 8360 8361 // C++ [class.union]p1: If a union contains a member of reference type, 8362 // the program is ill-formed. 8363 if (EltTy->isReferenceType()) { 8364 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8365 << NewFD->getDeclName() << EltTy; 8366 NewFD->setInvalidDecl(); 8367 } 8368 } 8369 } 8370 8371 // FIXME: We need to pass in the attributes given an AST 8372 // representation, not a parser representation. 8373 if (D) 8374 // FIXME: What to pass instead of TUScope? 8375 ProcessDeclAttributes(TUScope, NewFD, *D); 8376 8377 // In auto-retain/release, infer strong retension for fields of 8378 // retainable type. 8379 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8380 NewFD->setInvalidDecl(); 8381 8382 if (T.isObjCGCWeak()) 8383 Diag(Loc, diag::warn_attribute_weak_on_field); 8384 8385 NewFD->setAccess(AS); 8386 return NewFD; 8387} 8388 8389bool Sema::CheckNontrivialField(FieldDecl *FD) { 8390 assert(FD); 8391 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8392 8393 if (FD->isInvalidDecl()) 8394 return true; 8395 8396 QualType EltTy = Context.getBaseElementType(FD->getType()); 8397 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8398 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8399 if (RDecl->getDefinition()) { 8400 // We check for copy constructors before constructors 8401 // because otherwise we'll never get complaints about 8402 // copy constructors. 8403 8404 CXXSpecialMember member = CXXInvalid; 8405 if (!RDecl->hasTrivialCopyConstructor()) 8406 member = CXXCopyConstructor; 8407 else if (!RDecl->hasTrivialDefaultConstructor()) 8408 member = CXXDefaultConstructor; 8409 else if (!RDecl->hasTrivialCopyAssignment()) 8410 member = CXXCopyAssignment; 8411 else if (!RDecl->hasTrivialDestructor()) 8412 member = CXXDestructor; 8413 8414 if (member != CXXInvalid) { 8415 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8416 // Objective-C++ ARC: it is an error to have a non-trivial field of 8417 // a union. However, system headers in Objective-C programs 8418 // occasionally have Objective-C lifetime objects within unions, 8419 // and rather than cause the program to fail, we make those 8420 // members unavailable. 8421 SourceLocation Loc = FD->getLocation(); 8422 if (getSourceManager().isInSystemHeader(Loc)) { 8423 if (!FD->hasAttr<UnavailableAttr>()) 8424 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8425 "this system field has retaining ownership")); 8426 return false; 8427 } 8428 } 8429 8430 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 8431 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8432 DiagnoseNontrivial(RT, member); 8433 return true; 8434 } 8435 } 8436 } 8437 8438 return false; 8439} 8440 8441/// DiagnoseNontrivial - Given that a class has a non-trivial 8442/// special member, figure out why. 8443void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8444 QualType QT(T, 0U); 8445 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8446 8447 // Check whether the member was user-declared. 8448 switch (member) { 8449 case CXXInvalid: 8450 break; 8451 8452 case CXXDefaultConstructor: 8453 if (RD->hasUserDeclaredConstructor()) { 8454 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8455 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8456 const FunctionDecl *body = 0; 8457 ci->hasBody(body); 8458 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8459 SourceLocation CtorLoc = ci->getLocation(); 8460 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8461 return; 8462 } 8463 } 8464 8465 llvm_unreachable("found no user-declared constructors"); 8466 } 8467 break; 8468 8469 case CXXCopyConstructor: 8470 if (RD->hasUserDeclaredCopyConstructor()) { 8471 SourceLocation CtorLoc = 8472 RD->getCopyConstructor(0)->getLocation(); 8473 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8474 return; 8475 } 8476 break; 8477 8478 case CXXMoveConstructor: 8479 if (RD->hasUserDeclaredMoveConstructor()) { 8480 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8481 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8482 return; 8483 } 8484 break; 8485 8486 case CXXCopyAssignment: 8487 if (RD->hasUserDeclaredCopyAssignment()) { 8488 // FIXME: this should use the location of the copy 8489 // assignment, not the type. 8490 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8491 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8492 return; 8493 } 8494 break; 8495 8496 case CXXMoveAssignment: 8497 if (RD->hasUserDeclaredMoveAssignment()) { 8498 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8499 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8500 return; 8501 } 8502 break; 8503 8504 case CXXDestructor: 8505 if (RD->hasUserDeclaredDestructor()) { 8506 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8507 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8508 return; 8509 } 8510 break; 8511 } 8512 8513 typedef CXXRecordDecl::base_class_iterator base_iter; 8514 8515 // Virtual bases and members inhibit trivial copying/construction, 8516 // but not trivial destruction. 8517 if (member != CXXDestructor) { 8518 // Check for virtual bases. vbases includes indirect virtual bases, 8519 // so we just iterate through the direct bases. 8520 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8521 if (bi->isVirtual()) { 8522 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8523 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8524 return; 8525 } 8526 8527 // Check for virtual methods. 8528 typedef CXXRecordDecl::method_iterator meth_iter; 8529 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8530 ++mi) { 8531 if (mi->isVirtual()) { 8532 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8533 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8534 return; 8535 } 8536 } 8537 } 8538 8539 bool (CXXRecordDecl::*hasTrivial)() const; 8540 switch (member) { 8541 case CXXDefaultConstructor: 8542 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8543 case CXXCopyConstructor: 8544 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8545 case CXXCopyAssignment: 8546 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8547 case CXXDestructor: 8548 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8549 default: 8550 llvm_unreachable("unexpected special member"); 8551 } 8552 8553 // Check for nontrivial bases (and recurse). 8554 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8555 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8556 assert(BaseRT && "Don't know how to handle dependent bases"); 8557 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8558 if (!(BaseRecTy->*hasTrivial)()) { 8559 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8560 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8561 DiagnoseNontrivial(BaseRT, member); 8562 return; 8563 } 8564 } 8565 8566 // Check for nontrivial members (and recurse). 8567 typedef RecordDecl::field_iterator field_iter; 8568 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8569 ++fi) { 8570 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8571 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8572 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8573 8574 if (!(EltRD->*hasTrivial)()) { 8575 SourceLocation FLoc = (*fi)->getLocation(); 8576 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8577 DiagnoseNontrivial(EltRT, member); 8578 return; 8579 } 8580 } 8581 8582 if (EltTy->isObjCLifetimeType()) { 8583 switch (EltTy.getObjCLifetime()) { 8584 case Qualifiers::OCL_None: 8585 case Qualifiers::OCL_ExplicitNone: 8586 break; 8587 8588 case Qualifiers::OCL_Autoreleasing: 8589 case Qualifiers::OCL_Weak: 8590 case Qualifiers::OCL_Strong: 8591 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8592 << QT << EltTy.getObjCLifetime(); 8593 return; 8594 } 8595 } 8596 } 8597 8598 llvm_unreachable("found no explanation for non-trivial member"); 8599} 8600 8601/// TranslateIvarVisibility - Translate visibility from a token ID to an 8602/// AST enum value. 8603static ObjCIvarDecl::AccessControl 8604TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8605 switch (ivarVisibility) { 8606 default: llvm_unreachable("Unknown visitibility kind"); 8607 case tok::objc_private: return ObjCIvarDecl::Private; 8608 case tok::objc_public: return ObjCIvarDecl::Public; 8609 case tok::objc_protected: return ObjCIvarDecl::Protected; 8610 case tok::objc_package: return ObjCIvarDecl::Package; 8611 } 8612} 8613 8614/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8615/// in order to create an IvarDecl object for it. 8616Decl *Sema::ActOnIvar(Scope *S, 8617 SourceLocation DeclStart, 8618 Declarator &D, Expr *BitfieldWidth, 8619 tok::ObjCKeywordKind Visibility) { 8620 8621 IdentifierInfo *II = D.getIdentifier(); 8622 Expr *BitWidth = (Expr*)BitfieldWidth; 8623 SourceLocation Loc = DeclStart; 8624 if (II) Loc = D.getIdentifierLoc(); 8625 8626 // FIXME: Unnamed fields can be handled in various different ways, for 8627 // example, unnamed unions inject all members into the struct namespace! 8628 8629 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8630 QualType T = TInfo->getType(); 8631 8632 if (BitWidth) { 8633 // 6.7.2.1p3, 6.7.2.1p4 8634 if (VerifyBitField(Loc, II, T, BitWidth)) { 8635 D.setInvalidType(); 8636 BitWidth = 0; 8637 } 8638 } else { 8639 // Not a bitfield. 8640 8641 // validate II. 8642 8643 } 8644 if (T->isReferenceType()) { 8645 Diag(Loc, diag::err_ivar_reference_type); 8646 D.setInvalidType(); 8647 } 8648 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8649 // than a variably modified type. 8650 else if (T->isVariablyModifiedType()) { 8651 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8652 D.setInvalidType(); 8653 } 8654 8655 // Get the visibility (access control) for this ivar. 8656 ObjCIvarDecl::AccessControl ac = 8657 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8658 : ObjCIvarDecl::None; 8659 // Must set ivar's DeclContext to its enclosing interface. 8660 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8661 ObjCContainerDecl *EnclosingContext; 8662 if (ObjCImplementationDecl *IMPDecl = 8663 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8664 if (!LangOpts.ObjCNonFragileABI2) { 8665 // Case of ivar declared in an implementation. Context is that of its class. 8666 EnclosingContext = IMPDecl->getClassInterface(); 8667 assert(EnclosingContext && "Implementation has no class interface!"); 8668 } 8669 else 8670 EnclosingContext = EnclosingDecl; 8671 } else { 8672 if (ObjCCategoryDecl *CDecl = 8673 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8674 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8675 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8676 return 0; 8677 } 8678 } 8679 EnclosingContext = EnclosingDecl; 8680 } 8681 8682 // Construct the decl. 8683 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8684 DeclStart, Loc, II, T, 8685 TInfo, ac, (Expr *)BitfieldWidth); 8686 8687 if (II) { 8688 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8689 ForRedeclaration); 8690 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8691 && !isa<TagDecl>(PrevDecl)) { 8692 Diag(Loc, diag::err_duplicate_member) << II; 8693 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8694 NewID->setInvalidDecl(); 8695 } 8696 } 8697 8698 // Process attributes attached to the ivar. 8699 ProcessDeclAttributes(S, NewID, D); 8700 8701 if (D.isInvalidType()) 8702 NewID->setInvalidDecl(); 8703 8704 // In ARC, infer 'retaining' for ivars of retainable type. 8705 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8706 NewID->setInvalidDecl(); 8707 8708 if (D.getDeclSpec().isModulePrivateSpecified()) 8709 NewID->setModulePrivate(); 8710 8711 if (II) { 8712 // FIXME: When interfaces are DeclContexts, we'll need to add 8713 // these to the interface. 8714 S->AddDecl(NewID); 8715 IdResolver.AddDecl(NewID); 8716 } 8717 8718 return NewID; 8719} 8720 8721/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8722/// class and class extensions. For every class @interface and class 8723/// extension @interface, if the last ivar is a bitfield of any type, 8724/// then add an implicit `char :0` ivar to the end of that interface. 8725void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8726 SmallVectorImpl<Decl *> &AllIvarDecls) { 8727 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8728 return; 8729 8730 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8731 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8732 8733 if (!Ivar->isBitField()) 8734 return; 8735 uint64_t BitFieldSize = 8736 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 8737 if (BitFieldSize == 0) 8738 return; 8739 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8740 if (!ID) { 8741 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8742 if (!CD->IsClassExtension()) 8743 return; 8744 } 8745 // No need to add this to end of @implementation. 8746 else 8747 return; 8748 } 8749 // All conditions are met. Add a new bitfield to the tail end of ivars. 8750 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8751 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8752 8753 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8754 DeclLoc, DeclLoc, 0, 8755 Context.CharTy, 8756 Context.getTrivialTypeSourceInfo(Context.CharTy, 8757 DeclLoc), 8758 ObjCIvarDecl::Private, BW, 8759 true); 8760 AllIvarDecls.push_back(Ivar); 8761} 8762 8763void Sema::ActOnFields(Scope* S, 8764 SourceLocation RecLoc, Decl *EnclosingDecl, 8765 llvm::ArrayRef<Decl *> Fields, 8766 SourceLocation LBrac, SourceLocation RBrac, 8767 AttributeList *Attr) { 8768 assert(EnclosingDecl && "missing record or interface decl"); 8769 8770 // If the decl this is being inserted into is invalid, then it may be a 8771 // redeclaration or some other bogus case. Don't try to add fields to it. 8772 if (EnclosingDecl->isInvalidDecl()) 8773 return; 8774 8775 // Verify that all the fields are okay. 8776 unsigned NumNamedMembers = 0; 8777 SmallVector<FieldDecl*, 32> RecFields; 8778 8779 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8780 bool ARCErrReported = false; 8781 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 8782 i != end; ++i) { 8783 FieldDecl *FD = cast<FieldDecl>(*i); 8784 8785 // Get the type for the field. 8786 const Type *FDTy = FD->getType().getTypePtr(); 8787 8788 if (!FD->isAnonymousStructOrUnion()) { 8789 // Remember all fields written by the user. 8790 RecFields.push_back(FD); 8791 } 8792 8793 // If the field is already invalid for some reason, don't emit more 8794 // diagnostics about it. 8795 if (FD->isInvalidDecl()) { 8796 EnclosingDecl->setInvalidDecl(); 8797 continue; 8798 } 8799 8800 // C99 6.7.2.1p2: 8801 // A structure or union shall not contain a member with 8802 // incomplete or function type (hence, a structure shall not 8803 // contain an instance of itself, but may contain a pointer to 8804 // an instance of itself), except that the last member of a 8805 // structure with more than one named member may have incomplete 8806 // array type; such a structure (and any union containing, 8807 // possibly recursively, a member that is such a structure) 8808 // shall not be a member of a structure or an element of an 8809 // array. 8810 if (FDTy->isFunctionType()) { 8811 // Field declared as a function. 8812 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8813 << FD->getDeclName(); 8814 FD->setInvalidDecl(); 8815 EnclosingDecl->setInvalidDecl(); 8816 continue; 8817 } else if (FDTy->isIncompleteArrayType() && Record && 8818 ((i + 1 == Fields.end() && !Record->isUnion()) || 8819 ((getLangOptions().MicrosoftExt || 8820 getLangOptions().CPlusPlus) && 8821 (i + 1 == Fields.end() || Record->isUnion())))) { 8822 // Flexible array member. 8823 // Microsoft and g++ is more permissive regarding flexible array. 8824 // It will accept flexible array in union and also 8825 // as the sole element of a struct/class. 8826 if (getLangOptions().MicrosoftExt) { 8827 if (Record->isUnion()) 8828 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8829 << FD->getDeclName(); 8830 else if (Fields.size() == 1) 8831 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8832 << FD->getDeclName() << Record->getTagKind(); 8833 } else if (getLangOptions().CPlusPlus) { 8834 if (Record->isUnion()) 8835 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8836 << FD->getDeclName(); 8837 else if (Fields.size() == 1) 8838 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8839 << FD->getDeclName() << Record->getTagKind(); 8840 } else if (NumNamedMembers < 1) { 8841 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8842 << FD->getDeclName(); 8843 FD->setInvalidDecl(); 8844 EnclosingDecl->setInvalidDecl(); 8845 continue; 8846 } 8847 if (!FD->getType()->isDependentType() && 8848 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 8849 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8850 << FD->getDeclName() << FD->getType(); 8851 FD->setInvalidDecl(); 8852 EnclosingDecl->setInvalidDecl(); 8853 continue; 8854 } 8855 // Okay, we have a legal flexible array member at the end of the struct. 8856 if (Record) 8857 Record->setHasFlexibleArrayMember(true); 8858 } else if (!FDTy->isDependentType() && 8859 RequireCompleteType(FD->getLocation(), FD->getType(), 8860 diag::err_field_incomplete)) { 8861 // Incomplete type 8862 FD->setInvalidDecl(); 8863 EnclosingDecl->setInvalidDecl(); 8864 continue; 8865 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8866 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8867 // If this is a member of a union, then entire union becomes "flexible". 8868 if (Record && Record->isUnion()) { 8869 Record->setHasFlexibleArrayMember(true); 8870 } else { 8871 // If this is a struct/class and this is not the last element, reject 8872 // it. Note that GCC supports variable sized arrays in the middle of 8873 // structures. 8874 if (i + 1 != Fields.end()) 8875 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8876 << FD->getDeclName() << FD->getType(); 8877 else { 8878 // We support flexible arrays at the end of structs in 8879 // other structs as an extension. 8880 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8881 << FD->getDeclName(); 8882 if (Record) 8883 Record->setHasFlexibleArrayMember(true); 8884 } 8885 } 8886 } 8887 if (Record && FDTTy->getDecl()->hasObjectMember()) 8888 Record->setHasObjectMember(true); 8889 } else if (FDTy->isObjCObjectType()) { 8890 /// A field cannot be an Objective-c object 8891 Diag(FD->getLocation(), diag::err_statically_allocated_object) 8892 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 8893 QualType T = Context.getObjCObjectPointerType(FD->getType()); 8894 FD->setType(T); 8895 } 8896 else if (!getLangOptions().CPlusPlus) { 8897 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 8898 // It's an error in ARC if a field has lifetime. 8899 // We don't want to report this in a system header, though, 8900 // so we just make the field unavailable. 8901 // FIXME: that's really not sufficient; we need to make the type 8902 // itself invalid to, say, initialize or copy. 8903 QualType T = FD->getType(); 8904 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 8905 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 8906 SourceLocation loc = FD->getLocation(); 8907 if (getSourceManager().isInSystemHeader(loc)) { 8908 if (!FD->hasAttr<UnavailableAttr>()) { 8909 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 8910 "this system field has retaining ownership")); 8911 } 8912 } else { 8913 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 8914 } 8915 ARCErrReported = true; 8916 } 8917 } 8918 else if (getLangOptions().ObjC1 && 8919 getLangOptions().getGC() != LangOptions::NonGC && 8920 Record && !Record->hasObjectMember()) { 8921 if (FD->getType()->isObjCObjectPointerType() || 8922 FD->getType().isObjCGCStrong()) 8923 Record->setHasObjectMember(true); 8924 else if (Context.getAsArrayType(FD->getType())) { 8925 QualType BaseType = Context.getBaseElementType(FD->getType()); 8926 if (BaseType->isRecordType() && 8927 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8928 Record->setHasObjectMember(true); 8929 else if (BaseType->isObjCObjectPointerType() || 8930 BaseType.isObjCGCStrong()) 8931 Record->setHasObjectMember(true); 8932 } 8933 } 8934 } 8935 // Keep track of the number of named members. 8936 if (FD->getIdentifier()) 8937 ++NumNamedMembers; 8938 } 8939 8940 // Okay, we successfully defined 'Record'. 8941 if (Record) { 8942 bool Completed = false; 8943 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8944 if (!CXXRecord->isInvalidDecl()) { 8945 // Set access bits correctly on the directly-declared conversions. 8946 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8947 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8948 I != E; ++I) 8949 Convs->setAccess(I, (*I)->getAccess()); 8950 8951 if (!CXXRecord->isDependentType()) { 8952 // Objective-C Automatic Reference Counting: 8953 // If a class has a non-static data member of Objective-C pointer 8954 // type (or array thereof), it is a non-POD type and its 8955 // default constructor (if any), copy constructor, copy assignment 8956 // operator, and destructor are non-trivial. 8957 // 8958 // This rule is also handled by CXXRecordDecl::completeDefinition(). 8959 // However, here we check whether this particular class is only 8960 // non-POD because of the presence of an Objective-C pointer member. 8961 // If so, objects of this type cannot be shared between code compiled 8962 // with instant objects and code compiled with manual retain/release. 8963 if (getLangOptions().ObjCAutoRefCount && 8964 CXXRecord->hasObjectMember() && 8965 CXXRecord->getLinkage() == ExternalLinkage) { 8966 if (CXXRecord->isPOD()) { 8967 Diag(CXXRecord->getLocation(), 8968 diag::warn_arc_non_pod_class_with_object_member) 8969 << CXXRecord; 8970 } else { 8971 // FIXME: Fix-Its would be nice here, but finding a good location 8972 // for them is going to be tricky. 8973 if (CXXRecord->hasTrivialCopyConstructor()) 8974 Diag(CXXRecord->getLocation(), 8975 diag::warn_arc_trivial_member_function_with_object_member) 8976 << CXXRecord << 0; 8977 if (CXXRecord->hasTrivialCopyAssignment()) 8978 Diag(CXXRecord->getLocation(), 8979 diag::warn_arc_trivial_member_function_with_object_member) 8980 << CXXRecord << 1; 8981 if (CXXRecord->hasTrivialDestructor()) 8982 Diag(CXXRecord->getLocation(), 8983 diag::warn_arc_trivial_member_function_with_object_member) 8984 << CXXRecord << 2; 8985 } 8986 } 8987 8988 // Adjust user-defined destructor exception spec. 8989 if (getLangOptions().CPlusPlus0x && 8990 CXXRecord->hasUserDeclaredDestructor()) 8991 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8992 8993 // Add any implicitly-declared members to this class. 8994 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8995 8996 // If we have virtual base classes, we may end up finding multiple 8997 // final overriders for a given virtual function. Check for this 8998 // problem now. 8999 if (CXXRecord->getNumVBases()) { 9000 CXXFinalOverriderMap FinalOverriders; 9001 CXXRecord->getFinalOverriders(FinalOverriders); 9002 9003 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9004 MEnd = FinalOverriders.end(); 9005 M != MEnd; ++M) { 9006 for (OverridingMethods::iterator SO = M->second.begin(), 9007 SOEnd = M->second.end(); 9008 SO != SOEnd; ++SO) { 9009 assert(SO->second.size() > 0 && 9010 "Virtual function without overridding functions?"); 9011 if (SO->second.size() == 1) 9012 continue; 9013 9014 // C++ [class.virtual]p2: 9015 // In a derived class, if a virtual member function of a base 9016 // class subobject has more than one final overrider the 9017 // program is ill-formed. 9018 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9019 << (NamedDecl *)M->first << Record; 9020 Diag(M->first->getLocation(), 9021 diag::note_overridden_virtual_function); 9022 for (OverridingMethods::overriding_iterator 9023 OM = SO->second.begin(), 9024 OMEnd = SO->second.end(); 9025 OM != OMEnd; ++OM) 9026 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9027 << (NamedDecl *)M->first << OM->Method->getParent(); 9028 9029 Record->setInvalidDecl(); 9030 } 9031 } 9032 CXXRecord->completeDefinition(&FinalOverriders); 9033 Completed = true; 9034 } 9035 } 9036 } 9037 } 9038 9039 if (!Completed) 9040 Record->completeDefinition(); 9041 9042 // Now that the record is complete, do any delayed exception spec checks 9043 // we were missing. 9044 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9045 const CXXDestructorDecl *Dtor = 9046 DelayedDestructorExceptionSpecChecks.back().first; 9047 if (Dtor->getParent() != Record) 9048 break; 9049 9050 assert(!Dtor->getParent()->isDependentType() && 9051 "Should not ever add destructors of templates into the list."); 9052 CheckOverridingFunctionExceptionSpec(Dtor, 9053 DelayedDestructorExceptionSpecChecks.back().second); 9054 DelayedDestructorExceptionSpecChecks.pop_back(); 9055 } 9056 9057 } else { 9058 ObjCIvarDecl **ClsFields = 9059 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9060 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9061 ID->setLocEnd(RBrac); 9062 // Add ivar's to class's DeclContext. 9063 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9064 ClsFields[i]->setLexicalDeclContext(ID); 9065 ID->addDecl(ClsFields[i]); 9066 } 9067 // Must enforce the rule that ivars in the base classes may not be 9068 // duplicates. 9069 if (ID->getSuperClass()) 9070 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9071 } else if (ObjCImplementationDecl *IMPDecl = 9072 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9073 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9074 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9075 // Ivar declared in @implementation never belongs to the implementation. 9076 // Only it is in implementation's lexical context. 9077 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9078 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9079 } else if (ObjCCategoryDecl *CDecl = 9080 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9081 // case of ivars in class extension; all other cases have been 9082 // reported as errors elsewhere. 9083 // FIXME. Class extension does not have a LocEnd field. 9084 // CDecl->setLocEnd(RBrac); 9085 // Add ivar's to class extension's DeclContext. 9086 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9087 ClsFields[i]->setLexicalDeclContext(CDecl); 9088 CDecl->addDecl(ClsFields[i]); 9089 } 9090 } 9091 } 9092 9093 if (Attr) 9094 ProcessDeclAttributeList(S, Record, Attr); 9095 9096 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9097 // set the visibility of this record. 9098 if (Record && !Record->getDeclContext()->isRecord()) 9099 AddPushedVisibilityAttribute(Record); 9100} 9101 9102/// \brief Determine whether the given integral value is representable within 9103/// the given type T. 9104static bool isRepresentableIntegerValue(ASTContext &Context, 9105 llvm::APSInt &Value, 9106 QualType T) { 9107 assert(T->isIntegralType(Context) && "Integral type required!"); 9108 unsigned BitWidth = Context.getIntWidth(T); 9109 9110 if (Value.isUnsigned() || Value.isNonNegative()) { 9111 if (T->isSignedIntegerOrEnumerationType()) 9112 --BitWidth; 9113 return Value.getActiveBits() <= BitWidth; 9114 } 9115 return Value.getMinSignedBits() <= BitWidth; 9116} 9117 9118// \brief Given an integral type, return the next larger integral type 9119// (or a NULL type of no such type exists). 9120static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9121 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9122 // enum checking below. 9123 assert(T->isIntegralType(Context) && "Integral type required!"); 9124 const unsigned NumTypes = 4; 9125 QualType SignedIntegralTypes[NumTypes] = { 9126 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9127 }; 9128 QualType UnsignedIntegralTypes[NumTypes] = { 9129 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9130 Context.UnsignedLongLongTy 9131 }; 9132 9133 unsigned BitWidth = Context.getTypeSize(T); 9134 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9135 : UnsignedIntegralTypes; 9136 for (unsigned I = 0; I != NumTypes; ++I) 9137 if (Context.getTypeSize(Types[I]) > BitWidth) 9138 return Types[I]; 9139 9140 return QualType(); 9141} 9142 9143EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9144 EnumConstantDecl *LastEnumConst, 9145 SourceLocation IdLoc, 9146 IdentifierInfo *Id, 9147 Expr *Val) { 9148 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9149 llvm::APSInt EnumVal(IntWidth); 9150 QualType EltTy; 9151 9152 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9153 Val = 0; 9154 9155 if (Val) { 9156 if (Enum->isDependentType() || Val->isTypeDependent()) 9157 EltTy = Context.DependentTy; 9158 else { 9159 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9160 SourceLocation ExpLoc; 9161 if (!Val->isValueDependent() && 9162 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9163 Val = 0; 9164 } else { 9165 if (!getLangOptions().CPlusPlus) { 9166 // C99 6.7.2.2p2: 9167 // The expression that defines the value of an enumeration constant 9168 // shall be an integer constant expression that has a value 9169 // representable as an int. 9170 9171 // Complain if the value is not representable in an int. 9172 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9173 Diag(IdLoc, diag::ext_enum_value_not_int) 9174 << EnumVal.toString(10) << Val->getSourceRange() 9175 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9176 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9177 // Force the type of the expression to 'int'. 9178 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9179 } 9180 } 9181 9182 if (Enum->isFixed()) { 9183 EltTy = Enum->getIntegerType(); 9184 9185 // C++0x [dcl.enum]p5: 9186 // ... if the initializing value of an enumerator cannot be 9187 // represented by the underlying type, the program is ill-formed. 9188 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9189 if (getLangOptions().MicrosoftExt) { 9190 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9191 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9192 } else 9193 Diag(IdLoc, diag::err_enumerator_too_large) 9194 << EltTy; 9195 } else 9196 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9197 } 9198 else { 9199 // C++0x [dcl.enum]p5: 9200 // If the underlying type is not fixed, the type of each enumerator 9201 // is the type of its initializing value: 9202 // - If an initializer is specified for an enumerator, the 9203 // initializing value has the same type as the expression. 9204 EltTy = Val->getType(); 9205 } 9206 } 9207 } 9208 } 9209 9210 if (!Val) { 9211 if (Enum->isDependentType()) 9212 EltTy = Context.DependentTy; 9213 else if (!LastEnumConst) { 9214 // C++0x [dcl.enum]p5: 9215 // If the underlying type is not fixed, the type of each enumerator 9216 // is the type of its initializing value: 9217 // - If no initializer is specified for the first enumerator, the 9218 // initializing value has an unspecified integral type. 9219 // 9220 // GCC uses 'int' for its unspecified integral type, as does 9221 // C99 6.7.2.2p3. 9222 if (Enum->isFixed()) { 9223 EltTy = Enum->getIntegerType(); 9224 } 9225 else { 9226 EltTy = Context.IntTy; 9227 } 9228 } else { 9229 // Assign the last value + 1. 9230 EnumVal = LastEnumConst->getInitVal(); 9231 ++EnumVal; 9232 EltTy = LastEnumConst->getType(); 9233 9234 // Check for overflow on increment. 9235 if (EnumVal < LastEnumConst->getInitVal()) { 9236 // C++0x [dcl.enum]p5: 9237 // If the underlying type is not fixed, the type of each enumerator 9238 // is the type of its initializing value: 9239 // 9240 // - Otherwise the type of the initializing value is the same as 9241 // the type of the initializing value of the preceding enumerator 9242 // unless the incremented value is not representable in that type, 9243 // in which case the type is an unspecified integral type 9244 // sufficient to contain the incremented value. If no such type 9245 // exists, the program is ill-formed. 9246 QualType T = getNextLargerIntegralType(Context, EltTy); 9247 if (T.isNull() || Enum->isFixed()) { 9248 // There is no integral type larger enough to represent this 9249 // value. Complain, then allow the value to wrap around. 9250 EnumVal = LastEnumConst->getInitVal(); 9251 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9252 ++EnumVal; 9253 if (Enum->isFixed()) 9254 // When the underlying type is fixed, this is ill-formed. 9255 Diag(IdLoc, diag::err_enumerator_wrapped) 9256 << EnumVal.toString(10) 9257 << EltTy; 9258 else 9259 Diag(IdLoc, diag::warn_enumerator_too_large) 9260 << EnumVal.toString(10); 9261 } else { 9262 EltTy = T; 9263 } 9264 9265 // Retrieve the last enumerator's value, extent that type to the 9266 // type that is supposed to be large enough to represent the incremented 9267 // value, then increment. 9268 EnumVal = LastEnumConst->getInitVal(); 9269 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9270 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9271 ++EnumVal; 9272 9273 // If we're not in C++, diagnose the overflow of enumerator values, 9274 // which in C99 means that the enumerator value is not representable in 9275 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9276 // permits enumerator values that are representable in some larger 9277 // integral type. 9278 if (!getLangOptions().CPlusPlus && !T.isNull()) 9279 Diag(IdLoc, diag::warn_enum_value_overflow); 9280 } else if (!getLangOptions().CPlusPlus && 9281 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9282 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9283 Diag(IdLoc, diag::ext_enum_value_not_int) 9284 << EnumVal.toString(10) << 1; 9285 } 9286 } 9287 } 9288 9289 if (!EltTy->isDependentType()) { 9290 // Make the enumerator value match the signedness and size of the 9291 // enumerator's type. 9292 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9293 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9294 } 9295 9296 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9297 Val, EnumVal); 9298} 9299 9300 9301Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9302 SourceLocation IdLoc, IdentifierInfo *Id, 9303 AttributeList *Attr, 9304 SourceLocation EqualLoc, Expr *val) { 9305 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9306 EnumConstantDecl *LastEnumConst = 9307 cast_or_null<EnumConstantDecl>(lastEnumConst); 9308 Expr *Val = static_cast<Expr*>(val); 9309 9310 // The scope passed in may not be a decl scope. Zip up the scope tree until 9311 // we find one that is. 9312 S = getNonFieldDeclScope(S); 9313 9314 // Verify that there isn't already something declared with this name in this 9315 // scope. 9316 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9317 ForRedeclaration); 9318 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9319 // Maybe we will complain about the shadowed template parameter. 9320 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9321 // Just pretend that we didn't see the previous declaration. 9322 PrevDecl = 0; 9323 } 9324 9325 if (PrevDecl) { 9326 // When in C++, we may get a TagDecl with the same name; in this case the 9327 // enum constant will 'hide' the tag. 9328 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9329 "Received TagDecl when not in C++!"); 9330 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9331 if (isa<EnumConstantDecl>(PrevDecl)) 9332 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9333 else 9334 Diag(IdLoc, diag::err_redefinition) << Id; 9335 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9336 return 0; 9337 } 9338 } 9339 9340 // C++ [class.mem]p13: 9341 // If T is the name of a class, then each of the following shall have a 9342 // name different from T: 9343 // - every enumerator of every member of class T that is an enumerated 9344 // type 9345 if (CXXRecordDecl *Record 9346 = dyn_cast<CXXRecordDecl>( 9347 TheEnumDecl->getDeclContext()->getRedeclContext())) 9348 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9349 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9350 9351 EnumConstantDecl *New = 9352 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9353 9354 if (New) { 9355 // Process attributes. 9356 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9357 9358 // Register this decl in the current scope stack. 9359 New->setAccess(TheEnumDecl->getAccess()); 9360 PushOnScopeChains(New, S); 9361 } 9362 9363 return New; 9364} 9365 9366void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9367 SourceLocation RBraceLoc, Decl *EnumDeclX, 9368 Decl **Elements, unsigned NumElements, 9369 Scope *S, AttributeList *Attr) { 9370 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9371 QualType EnumType = Context.getTypeDeclType(Enum); 9372 9373 if (Attr) 9374 ProcessDeclAttributeList(S, Enum, Attr); 9375 9376 if (Enum->isDependentType()) { 9377 for (unsigned i = 0; i != NumElements; ++i) { 9378 EnumConstantDecl *ECD = 9379 cast_or_null<EnumConstantDecl>(Elements[i]); 9380 if (!ECD) continue; 9381 9382 ECD->setType(EnumType); 9383 } 9384 9385 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9386 return; 9387 } 9388 9389 // TODO: If the result value doesn't fit in an int, it must be a long or long 9390 // long value. ISO C does not support this, but GCC does as an extension, 9391 // emit a warning. 9392 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9393 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9394 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9395 9396 // Verify that all the values are okay, compute the size of the values, and 9397 // reverse the list. 9398 unsigned NumNegativeBits = 0; 9399 unsigned NumPositiveBits = 0; 9400 9401 // Keep track of whether all elements have type int. 9402 bool AllElementsInt = true; 9403 9404 for (unsigned i = 0; i != NumElements; ++i) { 9405 EnumConstantDecl *ECD = 9406 cast_or_null<EnumConstantDecl>(Elements[i]); 9407 if (!ECD) continue; // Already issued a diagnostic. 9408 9409 const llvm::APSInt &InitVal = ECD->getInitVal(); 9410 9411 // Keep track of the size of positive and negative values. 9412 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9413 NumPositiveBits = std::max(NumPositiveBits, 9414 (unsigned)InitVal.getActiveBits()); 9415 else 9416 NumNegativeBits = std::max(NumNegativeBits, 9417 (unsigned)InitVal.getMinSignedBits()); 9418 9419 // Keep track of whether every enum element has type int (very commmon). 9420 if (AllElementsInt) 9421 AllElementsInt = ECD->getType() == Context.IntTy; 9422 } 9423 9424 // Figure out the type that should be used for this enum. 9425 QualType BestType; 9426 unsigned BestWidth; 9427 9428 // C++0x N3000 [conv.prom]p3: 9429 // An rvalue of an unscoped enumeration type whose underlying 9430 // type is not fixed can be converted to an rvalue of the first 9431 // of the following types that can represent all the values of 9432 // the enumeration: int, unsigned int, long int, unsigned long 9433 // int, long long int, or unsigned long long int. 9434 // C99 6.4.4.3p2: 9435 // An identifier declared as an enumeration constant has type int. 9436 // The C99 rule is modified by a gcc extension 9437 QualType BestPromotionType; 9438 9439 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9440 // -fshort-enums is the equivalent to specifying the packed attribute on all 9441 // enum definitions. 9442 if (LangOpts.ShortEnums) 9443 Packed = true; 9444 9445 if (Enum->isFixed()) { 9446 BestType = BestPromotionType = Enum->getIntegerType(); 9447 // We don't need to set BestWidth, because BestType is going to be the type 9448 // of the enumerators, but we do anyway because otherwise some compilers 9449 // warn that it might be used uninitialized. 9450 BestWidth = CharWidth; 9451 } 9452 else if (NumNegativeBits) { 9453 // If there is a negative value, figure out the smallest integer type (of 9454 // int/long/longlong) that fits. 9455 // If it's packed, check also if it fits a char or a short. 9456 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9457 BestType = Context.SignedCharTy; 9458 BestWidth = CharWidth; 9459 } else if (Packed && NumNegativeBits <= ShortWidth && 9460 NumPositiveBits < ShortWidth) { 9461 BestType = Context.ShortTy; 9462 BestWidth = ShortWidth; 9463 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9464 BestType = Context.IntTy; 9465 BestWidth = IntWidth; 9466 } else { 9467 BestWidth = Context.getTargetInfo().getLongWidth(); 9468 9469 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9470 BestType = Context.LongTy; 9471 } else { 9472 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9473 9474 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9475 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9476 BestType = Context.LongLongTy; 9477 } 9478 } 9479 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9480 } else { 9481 // If there is no negative value, figure out the smallest type that fits 9482 // all of the enumerator values. 9483 // If it's packed, check also if it fits a char or a short. 9484 if (Packed && NumPositiveBits <= CharWidth) { 9485 BestType = Context.UnsignedCharTy; 9486 BestPromotionType = Context.IntTy; 9487 BestWidth = CharWidth; 9488 } else if (Packed && NumPositiveBits <= ShortWidth) { 9489 BestType = Context.UnsignedShortTy; 9490 BestPromotionType = Context.IntTy; 9491 BestWidth = ShortWidth; 9492 } else if (NumPositiveBits <= IntWidth) { 9493 BestType = Context.UnsignedIntTy; 9494 BestWidth = IntWidth; 9495 BestPromotionType 9496 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9497 ? Context.UnsignedIntTy : Context.IntTy; 9498 } else if (NumPositiveBits <= 9499 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9500 BestType = Context.UnsignedLongTy; 9501 BestPromotionType 9502 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9503 ? Context.UnsignedLongTy : Context.LongTy; 9504 } else { 9505 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9506 assert(NumPositiveBits <= BestWidth && 9507 "How could an initializer get larger than ULL?"); 9508 BestType = Context.UnsignedLongLongTy; 9509 BestPromotionType 9510 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9511 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9512 } 9513 } 9514 9515 // Loop over all of the enumerator constants, changing their types to match 9516 // the type of the enum if needed. 9517 for (unsigned i = 0; i != NumElements; ++i) { 9518 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9519 if (!ECD) continue; // Already issued a diagnostic. 9520 9521 // Standard C says the enumerators have int type, but we allow, as an 9522 // extension, the enumerators to be larger than int size. If each 9523 // enumerator value fits in an int, type it as an int, otherwise type it the 9524 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9525 // that X has type 'int', not 'unsigned'. 9526 9527 // Determine whether the value fits into an int. 9528 llvm::APSInt InitVal = ECD->getInitVal(); 9529 9530 // If it fits into an integer type, force it. Otherwise force it to match 9531 // the enum decl type. 9532 QualType NewTy; 9533 unsigned NewWidth; 9534 bool NewSign; 9535 if (!getLangOptions().CPlusPlus && 9536 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9537 NewTy = Context.IntTy; 9538 NewWidth = IntWidth; 9539 NewSign = true; 9540 } else if (ECD->getType() == BestType) { 9541 // Already the right type! 9542 if (getLangOptions().CPlusPlus) 9543 // C++ [dcl.enum]p4: Following the closing brace of an 9544 // enum-specifier, each enumerator has the type of its 9545 // enumeration. 9546 ECD->setType(EnumType); 9547 continue; 9548 } else { 9549 NewTy = BestType; 9550 NewWidth = BestWidth; 9551 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9552 } 9553 9554 // Adjust the APSInt value. 9555 InitVal = InitVal.extOrTrunc(NewWidth); 9556 InitVal.setIsSigned(NewSign); 9557 ECD->setInitVal(InitVal); 9558 9559 // Adjust the Expr initializer and type. 9560 if (ECD->getInitExpr() && 9561 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9562 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9563 CK_IntegralCast, 9564 ECD->getInitExpr(), 9565 /*base paths*/ 0, 9566 VK_RValue)); 9567 if (getLangOptions().CPlusPlus) 9568 // C++ [dcl.enum]p4: Following the closing brace of an 9569 // enum-specifier, each enumerator has the type of its 9570 // enumeration. 9571 ECD->setType(EnumType); 9572 else 9573 ECD->setType(NewTy); 9574 } 9575 9576 Enum->completeDefinition(BestType, BestPromotionType, 9577 NumPositiveBits, NumNegativeBits); 9578} 9579 9580Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9581 SourceLocation StartLoc, 9582 SourceLocation EndLoc) { 9583 StringLiteral *AsmString = cast<StringLiteral>(expr); 9584 9585 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9586 AsmString, StartLoc, 9587 EndLoc); 9588 CurContext->addDecl(New); 9589 return New; 9590} 9591 9592DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9593 IdentifierInfo &ModuleName, 9594 SourceLocation ModuleNameLoc) { 9595 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9596 ModuleName, ModuleNameLoc); 9597 if (!Module) 9598 return true; 9599 9600 // FIXME: Actually create a declaration to describe the module import. 9601 (void)Module; 9602 return DeclResult((Decl *)0); 9603} 9604 9605void 9606Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9607 SourceLocation ModulePrivateKeyword) { 9608 assert(!Old->isModulePrivate() && "Old is module-private!"); 9609 9610 Diag(New->getLocation(), diag::err_module_private_follows_public) 9611 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9612 Diag(Old->getLocation(), diag::note_previous_declaration) 9613 << Old->getDeclName(); 9614 9615 // Drop the __module_private__ from the new declaration, since it's invalid. 9616 New->setModulePrivate(false); 9617} 9618 9619void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9620 SourceLocation PragmaLoc, 9621 SourceLocation NameLoc) { 9622 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9623 9624 if (PrevDecl) { 9625 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9626 } else { 9627 (void)WeakUndeclaredIdentifiers.insert( 9628 std::pair<IdentifierInfo*,WeakInfo> 9629 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9630 } 9631} 9632 9633void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9634 IdentifierInfo* AliasName, 9635 SourceLocation PragmaLoc, 9636 SourceLocation NameLoc, 9637 SourceLocation AliasNameLoc) { 9638 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9639 LookupOrdinaryName); 9640 WeakInfo W = WeakInfo(Name, NameLoc); 9641 9642 if (PrevDecl) { 9643 if (!PrevDecl->hasAttr<AliasAttr>()) 9644 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9645 DeclApplyPragmaWeak(TUScope, ND, W); 9646 } else { 9647 (void)WeakUndeclaredIdentifiers.insert( 9648 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9649 } 9650} 9651 9652Decl *Sema::getObjCDeclContext() const { 9653 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9654} 9655