SemaDecl.cpp revision b52c0dddffdb27b3a058913020001afcfc937d8d
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/Sema/DelayedDiagnostic.h" 37#include "clang/Basic/SourceManager.h" 38#include "clang/Basic/TargetInfo.h" 39// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 40#include "clang/Lex/Preprocessor.h" 41#include "clang/Lex/HeaderSearch.h" 42#include "clang/Lex/ModuleLoader.h" 43#include "llvm/ADT/Triple.h" 44#include <algorithm> 45#include <cstring> 46#include <functional> 47using namespace clang; 48using namespace sema; 49 50Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 51 if (OwnedType) { 52 Decl *Group[2] = { OwnedType, Ptr }; 53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 54 } 55 56 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 57} 58 59/// \brief If the identifier refers to a type name within this scope, 60/// return the declaration of that type. 61/// 62/// This routine performs ordinary name lookup of the identifier II 63/// within the given scope, with optional C++ scope specifier SS, to 64/// determine whether the name refers to a type. If so, returns an 65/// opaque pointer (actually a QualType) corresponding to that 66/// type. Otherwise, returns NULL. 67/// 68/// If name lookup results in an ambiguity, this routine will complain 69/// and then return NULL. 70ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 71 Scope *S, CXXScopeSpec *SS, 72 bool isClassName, bool HasTrailingDot, 73 ParsedType ObjectTypePtr, 74 bool WantNontrivialTypeSourceInfo) { 75 // Determine where we will perform name lookup. 76 DeclContext *LookupCtx = 0; 77 if (ObjectTypePtr) { 78 QualType ObjectType = ObjectTypePtr.get(); 79 if (ObjectType->isRecordType()) 80 LookupCtx = computeDeclContext(ObjectType); 81 } else if (SS && SS->isNotEmpty()) { 82 LookupCtx = computeDeclContext(*SS, false); 83 84 if (!LookupCtx) { 85 if (isDependentScopeSpecifier(*SS)) { 86 // C++ [temp.res]p3: 87 // A qualified-id that refers to a type and in which the 88 // nested-name-specifier depends on a template-parameter (14.6.2) 89 // shall be prefixed by the keyword typename to indicate that the 90 // qualified-id denotes a type, forming an 91 // elaborated-type-specifier (7.1.5.3). 92 // 93 // We therefore do not perform any name lookup if the result would 94 // refer to a member of an unknown specialization. 95 if (!isClassName) 96 return ParsedType(); 97 98 // We know from the grammar that this name refers to a type, 99 // so build a dependent node to describe the type. 100 if (WantNontrivialTypeSourceInfo) 101 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 102 103 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 104 QualType T = 105 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 106 II, NameLoc); 107 108 return ParsedType::make(T); 109 } 110 111 return ParsedType(); 112 } 113 114 if (!LookupCtx->isDependentContext() && 115 RequireCompleteDeclContext(*SS, LookupCtx)) 116 return ParsedType(); 117 } 118 119 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 120 // lookup for class-names. 121 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 122 LookupOrdinaryName; 123 LookupResult Result(*this, &II, NameLoc, Kind); 124 if (LookupCtx) { 125 // Perform "qualified" name lookup into the declaration context we 126 // computed, which is either the type of the base of a member access 127 // expression or the declaration context associated with a prior 128 // nested-name-specifier. 129 LookupQualifiedName(Result, LookupCtx); 130 131 if (ObjectTypePtr && Result.empty()) { 132 // C++ [basic.lookup.classref]p3: 133 // If the unqualified-id is ~type-name, the type-name is looked up 134 // in the context of the entire postfix-expression. If the type T of 135 // the object expression is of a class type C, the type-name is also 136 // looked up in the scope of class C. At least one of the lookups shall 137 // find a name that refers to (possibly cv-qualified) T. 138 LookupName(Result, S); 139 } 140 } else { 141 // Perform unqualified name lookup. 142 LookupName(Result, S); 143 } 144 145 NamedDecl *IIDecl = 0; 146 switch (Result.getResultKind()) { 147 case LookupResult::NotFound: 148 case LookupResult::NotFoundInCurrentInstantiation: 149 case LookupResult::FoundOverloaded: 150 case LookupResult::FoundUnresolvedValue: 151 Result.suppressDiagnostics(); 152 return ParsedType(); 153 154 case LookupResult::Ambiguous: 155 // Recover from type-hiding ambiguities by hiding the type. We'll 156 // do the lookup again when looking for an object, and we can 157 // diagnose the error then. If we don't do this, then the error 158 // about hiding the type will be immediately followed by an error 159 // that only makes sense if the identifier was treated like a type. 160 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 161 Result.suppressDiagnostics(); 162 return ParsedType(); 163 } 164 165 // Look to see if we have a type anywhere in the list of results. 166 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 167 Res != ResEnd; ++Res) { 168 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 169 if (!IIDecl || 170 (*Res)->getLocation().getRawEncoding() < 171 IIDecl->getLocation().getRawEncoding()) 172 IIDecl = *Res; 173 } 174 } 175 176 if (!IIDecl) { 177 // None of the entities we found is a type, so there is no way 178 // to even assume that the result is a type. In this case, don't 179 // complain about the ambiguity. The parser will either try to 180 // perform this lookup again (e.g., as an object name), which 181 // will produce the ambiguity, or will complain that it expected 182 // a type name. 183 Result.suppressDiagnostics(); 184 return ParsedType(); 185 } 186 187 // We found a type within the ambiguous lookup; diagnose the 188 // ambiguity and then return that type. This might be the right 189 // answer, or it might not be, but it suppresses any attempt to 190 // perform the name lookup again. 191 break; 192 193 case LookupResult::Found: 194 IIDecl = Result.getFoundDecl(); 195 break; 196 } 197 198 assert(IIDecl && "Didn't find decl"); 199 200 QualType T; 201 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 202 DiagnoseUseOfDecl(IIDecl, NameLoc); 203 204 if (T.isNull()) 205 T = Context.getTypeDeclType(TD); 206 207 if (SS && SS->isNotEmpty()) { 208 if (WantNontrivialTypeSourceInfo) { 209 // Construct a type with type-source information. 210 TypeLocBuilder Builder; 211 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 212 213 T = getElaboratedType(ETK_None, *SS, T); 214 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 215 ElabTL.setKeywordLoc(SourceLocation()); 216 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 217 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 218 } else { 219 T = getElaboratedType(ETK_None, *SS, T); 220 } 221 } 222 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 223 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 224 if (!HasTrailingDot) 225 T = Context.getObjCInterfaceType(IDecl); 226 } 227 228 if (T.isNull()) { 229 // If it's not plausibly a type, suppress diagnostics. 230 Result.suppressDiagnostics(); 231 return ParsedType(); 232 } 233 return ParsedType::make(T); 234} 235 236/// isTagName() - This method is called *for error recovery purposes only* 237/// to determine if the specified name is a valid tag name ("struct foo"). If 238/// so, this returns the TST for the tag corresponding to it (TST_enum, 239/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 240/// where the user forgot to specify the tag. 241DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 242 // Do a tag name lookup in this scope. 243 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 244 LookupName(R, S, false); 245 R.suppressDiagnostics(); 246 if (R.getResultKind() == LookupResult::Found) 247 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 248 switch (TD->getTagKind()) { 249 default: return DeclSpec::TST_unspecified; 250 case TTK_Struct: return DeclSpec::TST_struct; 251 case TTK_Union: return DeclSpec::TST_union; 252 case TTK_Class: return DeclSpec::TST_class; 253 case TTK_Enum: return DeclSpec::TST_enum; 254 } 255 } 256 257 return DeclSpec::TST_unspecified; 258} 259 260/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 261/// if a CXXScopeSpec's type is equal to the type of one of the base classes 262/// then downgrade the missing typename error to a warning. 263/// This is needed for MSVC compatibility; Example: 264/// @code 265/// template<class T> class A { 266/// public: 267/// typedef int TYPE; 268/// }; 269/// template<class T> class B : public A<T> { 270/// public: 271/// A<T>::TYPE a; // no typename required because A<T> is a base class. 272/// }; 273/// @endcode 274bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 275 if (CurContext->isRecord()) { 276 const Type *Ty = SS->getScopeRep()->getAsType(); 277 278 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 279 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 280 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 281 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 282 return true; 283 } 284 return CurContext->isFunctionOrMethod(); 285} 286 287bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 288 SourceLocation IILoc, 289 Scope *S, 290 CXXScopeSpec *SS, 291 ParsedType &SuggestedType) { 292 // We don't have anything to suggest (yet). 293 SuggestedType = ParsedType(); 294 295 // There may have been a typo in the name of the type. Look up typo 296 // results, in case we have something that we can suggest. 297 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 298 LookupOrdinaryName, S, SS, NULL, 299 false, CTC_Type)) { 300 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 301 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 302 303 if (Corrected.isKeyword()) { 304 // We corrected to a keyword. 305 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 306 Diag(IILoc, diag::err_unknown_typename_suggest) 307 << &II << CorrectedQuotedStr; 308 return true; 309 } else { 310 NamedDecl *Result = Corrected.getCorrectionDecl(); 311 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 312 !Result->isInvalidDecl()) { 313 // We found a similarly-named type or interface; suggest that. 314 if (!SS || !SS->isSet()) 315 Diag(IILoc, diag::err_unknown_typename_suggest) 316 << &II << CorrectedQuotedStr 317 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 318 else if (DeclContext *DC = computeDeclContext(*SS, false)) 319 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 320 << &II << DC << CorrectedQuotedStr << SS->getRange() 321 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 322 else 323 llvm_unreachable("could not have corrected a typo here"); 324 325 Diag(Result->getLocation(), diag::note_previous_decl) 326 << CorrectedQuotedStr; 327 328 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 329 false, false, ParsedType(), 330 /*NonTrivialTypeSourceInfo=*/true); 331 return true; 332 } 333 } 334 } 335 336 if (getLangOptions().CPlusPlus) { 337 // See if II is a class template that the user forgot to pass arguments to. 338 UnqualifiedId Name; 339 Name.setIdentifier(&II, IILoc); 340 CXXScopeSpec EmptySS; 341 TemplateTy TemplateResult; 342 bool MemberOfUnknownSpecialization; 343 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 344 Name, ParsedType(), true, TemplateResult, 345 MemberOfUnknownSpecialization) == TNK_Type_template) { 346 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 347 Diag(IILoc, diag::err_template_missing_args) << TplName; 348 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 349 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 350 << TplDecl->getTemplateParameters()->getSourceRange(); 351 } 352 return true; 353 } 354 } 355 356 // FIXME: Should we move the logic that tries to recover from a missing tag 357 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 358 359 if (!SS || (!SS->isSet() && !SS->isInvalid())) 360 Diag(IILoc, diag::err_unknown_typename) << &II; 361 else if (DeclContext *DC = computeDeclContext(*SS, false)) 362 Diag(IILoc, diag::err_typename_nested_not_found) 363 << &II << DC << SS->getRange(); 364 else if (isDependentScopeSpecifier(*SS)) { 365 unsigned DiagID = diag::err_typename_missing; 366 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS)) 367 DiagID = diag::warn_typename_missing; 368 369 Diag(SS->getRange().getBegin(), DiagID) 370 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 371 << SourceRange(SS->getRange().getBegin(), IILoc) 372 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 373 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 374 } else { 375 assert(SS && SS->isInvalid() && 376 "Invalid scope specifier has already been diagnosed"); 377 } 378 379 return true; 380} 381 382/// \brief Determine whether the given result set contains either a type name 383/// or 384static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 385 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 386 NextToken.is(tok::less); 387 388 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 389 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 390 return true; 391 392 if (CheckTemplate && isa<TemplateDecl>(*I)) 393 return true; 394 } 395 396 return false; 397} 398 399Sema::NameClassification Sema::ClassifyName(Scope *S, 400 CXXScopeSpec &SS, 401 IdentifierInfo *&Name, 402 SourceLocation NameLoc, 403 const Token &NextToken) { 404 DeclarationNameInfo NameInfo(Name, NameLoc); 405 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 406 407 if (NextToken.is(tok::coloncolon)) { 408 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 409 QualType(), false, SS, 0, false); 410 411 } 412 413 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 414 LookupParsedName(Result, S, &SS, !CurMethod); 415 416 // Perform lookup for Objective-C instance variables (including automatically 417 // synthesized instance variables), if we're in an Objective-C method. 418 // FIXME: This lookup really, really needs to be folded in to the normal 419 // unqualified lookup mechanism. 420 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 421 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 422 if (E.get() || E.isInvalid()) 423 return E; 424 } 425 426 bool SecondTry = false; 427 bool IsFilteredTemplateName = false; 428 429Corrected: 430 switch (Result.getResultKind()) { 431 case LookupResult::NotFound: 432 // If an unqualified-id is followed by a '(', then we have a function 433 // call. 434 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 435 // In C++, this is an ADL-only call. 436 // FIXME: Reference? 437 if (getLangOptions().CPlusPlus) 438 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 439 440 // C90 6.3.2.2: 441 // If the expression that precedes the parenthesized argument list in a 442 // function call consists solely of an identifier, and if no 443 // declaration is visible for this identifier, the identifier is 444 // implicitly declared exactly as if, in the innermost block containing 445 // the function call, the declaration 446 // 447 // extern int identifier (); 448 // 449 // appeared. 450 // 451 // We also allow this in C99 as an extension. 452 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 453 Result.addDecl(D); 454 Result.resolveKind(); 455 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 456 } 457 } 458 459 // In C, we first see whether there is a tag type by the same name, in 460 // which case it's likely that the user just forget to write "enum", 461 // "struct", or "union". 462 if (!getLangOptions().CPlusPlus && !SecondTry) { 463 Result.clear(LookupTagName); 464 LookupParsedName(Result, S, &SS); 465 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 466 const char *TagName = 0; 467 const char *FixItTagName = 0; 468 switch (Tag->getTagKind()) { 469 case TTK_Class: 470 TagName = "class"; 471 FixItTagName = "class "; 472 break; 473 474 case TTK_Enum: 475 TagName = "enum"; 476 FixItTagName = "enum "; 477 break; 478 479 case TTK_Struct: 480 TagName = "struct"; 481 FixItTagName = "struct "; 482 break; 483 484 case TTK_Union: 485 TagName = "union"; 486 FixItTagName = "union "; 487 break; 488 } 489 490 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 491 << Name << TagName << getLangOptions().CPlusPlus 492 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 493 break; 494 } 495 496 Result.clear(LookupOrdinaryName); 497 } 498 499 // Perform typo correction to determine if there is another name that is 500 // close to this name. 501 if (!SecondTry) { 502 SecondTry = true; 503 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 504 Result.getLookupKind(), S, &SS)) { 505 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 506 unsigned QualifiedDiag = diag::err_no_member_suggest; 507 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 508 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 509 510 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 511 NamedDecl *UnderlyingFirstDecl 512 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 513 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 514 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 515 UnqualifiedDiag = diag::err_no_template_suggest; 516 QualifiedDiag = diag::err_no_member_template_suggest; 517 } else if (UnderlyingFirstDecl && 518 (isa<TypeDecl>(UnderlyingFirstDecl) || 519 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 520 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 521 UnqualifiedDiag = diag::err_unknown_typename_suggest; 522 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 523 } 524 525 if (SS.isEmpty()) 526 Diag(NameLoc, UnqualifiedDiag) 527 << Name << CorrectedQuotedStr 528 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 529 else 530 Diag(NameLoc, QualifiedDiag) 531 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 532 << SS.getRange() 533 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 534 535 // Update the name, so that the caller has the new name. 536 Name = Corrected.getCorrectionAsIdentifierInfo(); 537 538 // Also update the LookupResult... 539 // FIXME: This should probably go away at some point 540 Result.clear(); 541 Result.setLookupName(Corrected.getCorrection()); 542 if (FirstDecl) Result.addDecl(FirstDecl); 543 544 // Typo correction corrected to a keyword. 545 if (Corrected.isKeyword()) 546 return Corrected.getCorrectionAsIdentifierInfo(); 547 548 if (FirstDecl) 549 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 550 << CorrectedQuotedStr; 551 552 // If we found an Objective-C instance variable, let 553 // LookupInObjCMethod build the appropriate expression to 554 // reference the ivar. 555 // FIXME: This is a gross hack. 556 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 557 Result.clear(); 558 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 559 return move(E); 560 } 561 562 goto Corrected; 563 } 564 } 565 566 // We failed to correct; just fall through and let the parser deal with it. 567 Result.suppressDiagnostics(); 568 return NameClassification::Unknown(); 569 570 case LookupResult::NotFoundInCurrentInstantiation: 571 // We performed name lookup into the current instantiation, and there were 572 // dependent bases, so we treat this result the same way as any other 573 // dependent nested-name-specifier. 574 575 // C++ [temp.res]p2: 576 // A name used in a template declaration or definition and that is 577 // dependent on a template-parameter is assumed not to name a type 578 // unless the applicable name lookup finds a type name or the name is 579 // qualified by the keyword typename. 580 // 581 // FIXME: If the next token is '<', we might want to ask the parser to 582 // perform some heroics to see if we actually have a 583 // template-argument-list, which would indicate a missing 'template' 584 // keyword here. 585 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 586 587 case LookupResult::Found: 588 case LookupResult::FoundOverloaded: 589 case LookupResult::FoundUnresolvedValue: 590 break; 591 592 case LookupResult::Ambiguous: 593 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 594 hasAnyAcceptableTemplateNames(Result)) { 595 // C++ [temp.local]p3: 596 // A lookup that finds an injected-class-name (10.2) can result in an 597 // ambiguity in certain cases (for example, if it is found in more than 598 // one base class). If all of the injected-class-names that are found 599 // refer to specializations of the same class template, and if the name 600 // is followed by a template-argument-list, the reference refers to the 601 // class template itself and not a specialization thereof, and is not 602 // ambiguous. 603 // 604 // This filtering can make an ambiguous result into an unambiguous one, 605 // so try again after filtering out template names. 606 FilterAcceptableTemplateNames(Result); 607 if (!Result.isAmbiguous()) { 608 IsFilteredTemplateName = true; 609 break; 610 } 611 } 612 613 // Diagnose the ambiguity and return an error. 614 return NameClassification::Error(); 615 } 616 617 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 618 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 619 // C++ [temp.names]p3: 620 // After name lookup (3.4) finds that a name is a template-name or that 621 // an operator-function-id or a literal- operator-id refers to a set of 622 // overloaded functions any member of which is a function template if 623 // this is followed by a <, the < is always taken as the delimiter of a 624 // template-argument-list and never as the less-than operator. 625 if (!IsFilteredTemplateName) 626 FilterAcceptableTemplateNames(Result); 627 628 if (!Result.empty()) { 629 bool IsFunctionTemplate; 630 TemplateName Template; 631 if (Result.end() - Result.begin() > 1) { 632 IsFunctionTemplate = true; 633 Template = Context.getOverloadedTemplateName(Result.begin(), 634 Result.end()); 635 } else { 636 TemplateDecl *TD 637 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 638 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 639 640 if (SS.isSet() && !SS.isInvalid()) 641 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 642 /*TemplateKeyword=*/false, 643 TD); 644 else 645 Template = TemplateName(TD); 646 } 647 648 if (IsFunctionTemplate) { 649 // Function templates always go through overload resolution, at which 650 // point we'll perform the various checks (e.g., accessibility) we need 651 // to based on which function we selected. 652 Result.suppressDiagnostics(); 653 654 return NameClassification::FunctionTemplate(Template); 655 } 656 657 return NameClassification::TypeTemplate(Template); 658 } 659 } 660 661 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 662 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 663 DiagnoseUseOfDecl(Type, NameLoc); 664 QualType T = Context.getTypeDeclType(Type); 665 return ParsedType::make(T); 666 } 667 668 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 669 if (!Class) { 670 // FIXME: It's unfortunate that we don't have a Type node for handling this. 671 if (ObjCCompatibleAliasDecl *Alias 672 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 673 Class = Alias->getClassInterface(); 674 } 675 676 if (Class) { 677 DiagnoseUseOfDecl(Class, NameLoc); 678 679 if (NextToken.is(tok::period)) { 680 // Interface. <something> is parsed as a property reference expression. 681 // Just return "unknown" as a fall-through for now. 682 Result.suppressDiagnostics(); 683 return NameClassification::Unknown(); 684 } 685 686 QualType T = Context.getObjCInterfaceType(Class); 687 return ParsedType::make(T); 688 } 689 690 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 691 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 692 693 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 694 return BuildDeclarationNameExpr(SS, Result, ADL); 695} 696 697// Determines the context to return to after temporarily entering a 698// context. This depends in an unnecessarily complicated way on the 699// exact ordering of callbacks from the parser. 700DeclContext *Sema::getContainingDC(DeclContext *DC) { 701 702 // Functions defined inline within classes aren't parsed until we've 703 // finished parsing the top-level class, so the top-level class is 704 // the context we'll need to return to. 705 if (isa<FunctionDecl>(DC)) { 706 DC = DC->getLexicalParent(); 707 708 // A function not defined within a class will always return to its 709 // lexical context. 710 if (!isa<CXXRecordDecl>(DC)) 711 return DC; 712 713 // A C++ inline method/friend is parsed *after* the topmost class 714 // it was declared in is fully parsed ("complete"); the topmost 715 // class is the context we need to return to. 716 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 717 DC = RD; 718 719 // Return the declaration context of the topmost class the inline method is 720 // declared in. 721 return DC; 722 } 723 724 return DC->getLexicalParent(); 725} 726 727void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 728 assert(getContainingDC(DC) == CurContext && 729 "The next DeclContext should be lexically contained in the current one."); 730 CurContext = DC; 731 S->setEntity(DC); 732} 733 734void Sema::PopDeclContext() { 735 assert(CurContext && "DeclContext imbalance!"); 736 737 CurContext = getContainingDC(CurContext); 738 assert(CurContext && "Popped translation unit!"); 739} 740 741/// EnterDeclaratorContext - Used when we must lookup names in the context 742/// of a declarator's nested name specifier. 743/// 744void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 745 // C++0x [basic.lookup.unqual]p13: 746 // A name used in the definition of a static data member of class 747 // X (after the qualified-id of the static member) is looked up as 748 // if the name was used in a member function of X. 749 // C++0x [basic.lookup.unqual]p14: 750 // If a variable member of a namespace is defined outside of the 751 // scope of its namespace then any name used in the definition of 752 // the variable member (after the declarator-id) is looked up as 753 // if the definition of the variable member occurred in its 754 // namespace. 755 // Both of these imply that we should push a scope whose context 756 // is the semantic context of the declaration. We can't use 757 // PushDeclContext here because that context is not necessarily 758 // lexically contained in the current context. Fortunately, 759 // the containing scope should have the appropriate information. 760 761 assert(!S->getEntity() && "scope already has entity"); 762 763#ifndef NDEBUG 764 Scope *Ancestor = S->getParent(); 765 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 766 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 767#endif 768 769 CurContext = DC; 770 S->setEntity(DC); 771} 772 773void Sema::ExitDeclaratorContext(Scope *S) { 774 assert(S->getEntity() == CurContext && "Context imbalance!"); 775 776 // Switch back to the lexical context. The safety of this is 777 // enforced by an assert in EnterDeclaratorContext. 778 Scope *Ancestor = S->getParent(); 779 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 780 CurContext = (DeclContext*) Ancestor->getEntity(); 781 782 // We don't need to do anything with the scope, which is going to 783 // disappear. 784} 785 786 787void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 788 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 789 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 790 // We assume that the caller has already called 791 // ActOnReenterTemplateScope 792 FD = TFD->getTemplatedDecl(); 793 } 794 if (!FD) 795 return; 796 797 PushDeclContext(S, FD); 798 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 799 ParmVarDecl *Param = FD->getParamDecl(P); 800 // If the parameter has an identifier, then add it to the scope 801 if (Param->getIdentifier()) { 802 S->AddDecl(Param); 803 IdResolver.AddDecl(Param); 804 } 805 } 806} 807 808 809/// \brief Determine whether we allow overloading of the function 810/// PrevDecl with another declaration. 811/// 812/// This routine determines whether overloading is possible, not 813/// whether some new function is actually an overload. It will return 814/// true in C++ (where we can always provide overloads) or, as an 815/// extension, in C when the previous function is already an 816/// overloaded function declaration or has the "overloadable" 817/// attribute. 818static bool AllowOverloadingOfFunction(LookupResult &Previous, 819 ASTContext &Context) { 820 if (Context.getLangOptions().CPlusPlus) 821 return true; 822 823 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 824 return true; 825 826 return (Previous.getResultKind() == LookupResult::Found 827 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 828} 829 830/// Add this decl to the scope shadowed decl chains. 831void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 832 // Move up the scope chain until we find the nearest enclosing 833 // non-transparent context. The declaration will be introduced into this 834 // scope. 835 while (S->getEntity() && 836 ((DeclContext *)S->getEntity())->isTransparentContext()) 837 S = S->getParent(); 838 839 // Add scoped declarations into their context, so that they can be 840 // found later. Declarations without a context won't be inserted 841 // into any context. 842 if (AddToContext) 843 CurContext->addDecl(D); 844 845 // Out-of-line definitions shouldn't be pushed into scope in C++. 846 // Out-of-line variable and function definitions shouldn't even in C. 847 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 848 D->isOutOfLine()) 849 return; 850 851 // Template instantiations should also not be pushed into scope. 852 if (isa<FunctionDecl>(D) && 853 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 854 return; 855 856 // If this replaces anything in the current scope, 857 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 858 IEnd = IdResolver.end(); 859 for (; I != IEnd; ++I) { 860 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 861 S->RemoveDecl(*I); 862 IdResolver.RemoveDecl(*I); 863 864 // Should only need to replace one decl. 865 break; 866 } 867 } 868 869 S->AddDecl(D); 870 871 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 872 // Implicitly-generated labels may end up getting generated in an order that 873 // isn't strictly lexical, which breaks name lookup. Be careful to insert 874 // the label at the appropriate place in the identifier chain. 875 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 876 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 877 if (IDC == CurContext) { 878 if (!S->isDeclScope(*I)) 879 continue; 880 } else if (IDC->Encloses(CurContext)) 881 break; 882 } 883 884 IdResolver.InsertDeclAfter(I, D); 885 } else { 886 IdResolver.AddDecl(D); 887 } 888} 889 890bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 891 bool ExplicitInstantiationOrSpecialization) { 892 return IdResolver.isDeclInScope(D, Ctx, Context, S, 893 ExplicitInstantiationOrSpecialization); 894} 895 896Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 897 DeclContext *TargetDC = DC->getPrimaryContext(); 898 do { 899 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 900 if (ScopeDC->getPrimaryContext() == TargetDC) 901 return S; 902 } while ((S = S->getParent())); 903 904 return 0; 905} 906 907static bool isOutOfScopePreviousDeclaration(NamedDecl *, 908 DeclContext*, 909 ASTContext&); 910 911/// Filters out lookup results that don't fall within the given scope 912/// as determined by isDeclInScope. 913void Sema::FilterLookupForScope(LookupResult &R, 914 DeclContext *Ctx, Scope *S, 915 bool ConsiderLinkage, 916 bool ExplicitInstantiationOrSpecialization) { 917 LookupResult::Filter F = R.makeFilter(); 918 while (F.hasNext()) { 919 NamedDecl *D = F.next(); 920 921 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 922 continue; 923 924 if (ConsiderLinkage && 925 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 926 continue; 927 928 F.erase(); 929 } 930 931 F.done(); 932} 933 934static bool isUsingDecl(NamedDecl *D) { 935 return isa<UsingShadowDecl>(D) || 936 isa<UnresolvedUsingTypenameDecl>(D) || 937 isa<UnresolvedUsingValueDecl>(D); 938} 939 940/// Removes using shadow declarations from the lookup results. 941static void RemoveUsingDecls(LookupResult &R) { 942 LookupResult::Filter F = R.makeFilter(); 943 while (F.hasNext()) 944 if (isUsingDecl(F.next())) 945 F.erase(); 946 947 F.done(); 948} 949 950/// \brief Check for this common pattern: 951/// @code 952/// class S { 953/// S(const S&); // DO NOT IMPLEMENT 954/// void operator=(const S&); // DO NOT IMPLEMENT 955/// }; 956/// @endcode 957static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 958 // FIXME: Should check for private access too but access is set after we get 959 // the decl here. 960 if (D->doesThisDeclarationHaveABody()) 961 return false; 962 963 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 964 return CD->isCopyConstructor(); 965 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 966 return Method->isCopyAssignmentOperator(); 967 return false; 968} 969 970bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 971 assert(D); 972 973 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 974 return false; 975 976 // Ignore class templates. 977 if (D->getDeclContext()->isDependentContext() || 978 D->getLexicalDeclContext()->isDependentContext()) 979 return false; 980 981 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 982 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 983 return false; 984 985 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 986 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 987 return false; 988 } else { 989 // 'static inline' functions are used in headers; don't warn. 990 if (FD->getStorageClass() == SC_Static && 991 FD->isInlineSpecified()) 992 return false; 993 } 994 995 if (FD->doesThisDeclarationHaveABody() && 996 Context.DeclMustBeEmitted(FD)) 997 return false; 998 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 999 if (!VD->isFileVarDecl() || 1000 VD->getType().isConstant(Context) || 1001 Context.DeclMustBeEmitted(VD)) 1002 return false; 1003 1004 if (VD->isStaticDataMember() && 1005 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1006 return false; 1007 1008 } else { 1009 return false; 1010 } 1011 1012 // Only warn for unused decls internal to the translation unit. 1013 if (D->getLinkage() == ExternalLinkage) 1014 return false; 1015 1016 return true; 1017} 1018 1019void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1020 if (!D) 1021 return; 1022 1023 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1024 const FunctionDecl *First = FD->getFirstDeclaration(); 1025 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1026 return; // First should already be in the vector. 1027 } 1028 1029 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1030 const VarDecl *First = VD->getFirstDeclaration(); 1031 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1032 return; // First should already be in the vector. 1033 } 1034 1035 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1036 UnusedFileScopedDecls.push_back(D); 1037 } 1038 1039static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1040 if (D->isInvalidDecl()) 1041 return false; 1042 1043 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1044 return false; 1045 1046 if (isa<LabelDecl>(D)) 1047 return true; 1048 1049 // White-list anything that isn't a local variable. 1050 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1051 !D->getDeclContext()->isFunctionOrMethod()) 1052 return false; 1053 1054 // Types of valid local variables should be complete, so this should succeed. 1055 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1056 1057 // White-list anything with an __attribute__((unused)) type. 1058 QualType Ty = VD->getType(); 1059 1060 // Only look at the outermost level of typedef. 1061 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1062 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1063 return false; 1064 } 1065 1066 // If we failed to complete the type for some reason, or if the type is 1067 // dependent, don't diagnose the variable. 1068 if (Ty->isIncompleteType() || Ty->isDependentType()) 1069 return false; 1070 1071 if (const TagType *TT = Ty->getAs<TagType>()) { 1072 const TagDecl *Tag = TT->getDecl(); 1073 if (Tag->hasAttr<UnusedAttr>()) 1074 return false; 1075 1076 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1077 // FIXME: Checking for the presence of a user-declared constructor 1078 // isn't completely accurate; we'd prefer to check that the initializer 1079 // has no side effects. 1080 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1081 return false; 1082 } 1083 } 1084 1085 // TODO: __attribute__((unused)) templates? 1086 } 1087 1088 return true; 1089} 1090 1091static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1092 FixItHint &Hint) { 1093 if (isa<LabelDecl>(D)) { 1094 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1095 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1096 if (AfterColon.isInvalid()) 1097 return; 1098 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1099 getCharRange(D->getLocStart(), AfterColon)); 1100 } 1101 return; 1102} 1103 1104/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1105/// unless they are marked attr(unused). 1106void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1107 FixItHint Hint; 1108 if (!ShouldDiagnoseUnusedDecl(D)) 1109 return; 1110 1111 GenerateFixForUnusedDecl(D, Context, Hint); 1112 1113 unsigned DiagID; 1114 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1115 DiagID = diag::warn_unused_exception_param; 1116 else if (isa<LabelDecl>(D)) 1117 DiagID = diag::warn_unused_label; 1118 else 1119 DiagID = diag::warn_unused_variable; 1120 1121 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1122} 1123 1124static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1125 // Verify that we have no forward references left. If so, there was a goto 1126 // or address of a label taken, but no definition of it. Label fwd 1127 // definitions are indicated with a null substmt. 1128 if (L->getStmt() == 0) 1129 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1130} 1131 1132void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1133 if (S->decl_empty()) return; 1134 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1135 "Scope shouldn't contain decls!"); 1136 1137 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1138 I != E; ++I) { 1139 Decl *TmpD = (*I); 1140 assert(TmpD && "This decl didn't get pushed??"); 1141 1142 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1143 NamedDecl *D = cast<NamedDecl>(TmpD); 1144 1145 if (!D->getDeclName()) continue; 1146 1147 // Diagnose unused variables in this scope. 1148 if (!S->hasErrorOccurred()) 1149 DiagnoseUnusedDecl(D); 1150 1151 // If this was a forward reference to a label, verify it was defined. 1152 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1153 CheckPoppedLabel(LD, *this); 1154 1155 // Remove this name from our lexical scope. 1156 IdResolver.RemoveDecl(D); 1157 } 1158} 1159 1160/// \brief Look for an Objective-C class in the translation unit. 1161/// 1162/// \param Id The name of the Objective-C class we're looking for. If 1163/// typo-correction fixes this name, the Id will be updated 1164/// to the fixed name. 1165/// 1166/// \param IdLoc The location of the name in the translation unit. 1167/// 1168/// \param TypoCorrection If true, this routine will attempt typo correction 1169/// if there is no class with the given name. 1170/// 1171/// \returns The declaration of the named Objective-C class, or NULL if the 1172/// class could not be found. 1173ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1174 SourceLocation IdLoc, 1175 bool DoTypoCorrection) { 1176 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1177 // creation from this context. 1178 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1179 1180 if (!IDecl && DoTypoCorrection) { 1181 // Perform typo correction at the given location, but only if we 1182 // find an Objective-C class name. 1183 TypoCorrection C; 1184 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1185 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1186 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1187 Diag(IdLoc, diag::err_undef_interface_suggest) 1188 << Id << IDecl->getDeclName() 1189 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1190 Diag(IDecl->getLocation(), diag::note_previous_decl) 1191 << IDecl->getDeclName(); 1192 1193 Id = IDecl->getIdentifier(); 1194 } 1195 } 1196 1197 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1198} 1199 1200/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1201/// from S, where a non-field would be declared. This routine copes 1202/// with the difference between C and C++ scoping rules in structs and 1203/// unions. For example, the following code is well-formed in C but 1204/// ill-formed in C++: 1205/// @code 1206/// struct S6 { 1207/// enum { BAR } e; 1208/// }; 1209/// 1210/// void test_S6() { 1211/// struct S6 a; 1212/// a.e = BAR; 1213/// } 1214/// @endcode 1215/// For the declaration of BAR, this routine will return a different 1216/// scope. The scope S will be the scope of the unnamed enumeration 1217/// within S6. In C++, this routine will return the scope associated 1218/// with S6, because the enumeration's scope is a transparent 1219/// context but structures can contain non-field names. In C, this 1220/// routine will return the translation unit scope, since the 1221/// enumeration's scope is a transparent context and structures cannot 1222/// contain non-field names. 1223Scope *Sema::getNonFieldDeclScope(Scope *S) { 1224 while (((S->getFlags() & Scope::DeclScope) == 0) || 1225 (S->getEntity() && 1226 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1227 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1228 S = S->getParent(); 1229 return S; 1230} 1231 1232/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1233/// file scope. lazily create a decl for it. ForRedeclaration is true 1234/// if we're creating this built-in in anticipation of redeclaring the 1235/// built-in. 1236NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1237 Scope *S, bool ForRedeclaration, 1238 SourceLocation Loc) { 1239 Builtin::ID BID = (Builtin::ID)bid; 1240 1241 ASTContext::GetBuiltinTypeError Error; 1242 QualType R = Context.GetBuiltinType(BID, Error); 1243 switch (Error) { 1244 case ASTContext::GE_None: 1245 // Okay 1246 break; 1247 1248 case ASTContext::GE_Missing_stdio: 1249 if (ForRedeclaration) 1250 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1251 << Context.BuiltinInfo.GetName(BID); 1252 return 0; 1253 1254 case ASTContext::GE_Missing_setjmp: 1255 if (ForRedeclaration) 1256 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1257 << Context.BuiltinInfo.GetName(BID); 1258 return 0; 1259 } 1260 1261 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1262 Diag(Loc, diag::ext_implicit_lib_function_decl) 1263 << Context.BuiltinInfo.GetName(BID) 1264 << R; 1265 if (Context.BuiltinInfo.getHeaderName(BID) && 1266 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1267 != DiagnosticsEngine::Ignored) 1268 Diag(Loc, diag::note_please_include_header) 1269 << Context.BuiltinInfo.getHeaderName(BID) 1270 << Context.BuiltinInfo.GetName(BID); 1271 } 1272 1273 FunctionDecl *New = FunctionDecl::Create(Context, 1274 Context.getTranslationUnitDecl(), 1275 Loc, Loc, II, R, /*TInfo=*/0, 1276 SC_Extern, 1277 SC_None, false, 1278 /*hasPrototype=*/true); 1279 New->setImplicit(); 1280 1281 // Create Decl objects for each parameter, adding them to the 1282 // FunctionDecl. 1283 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1284 SmallVector<ParmVarDecl*, 16> Params; 1285 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1286 ParmVarDecl *parm = 1287 ParmVarDecl::Create(Context, New, SourceLocation(), 1288 SourceLocation(), 0, 1289 FT->getArgType(i), /*TInfo=*/0, 1290 SC_None, SC_None, 0); 1291 parm->setScopeInfo(0, i); 1292 Params.push_back(parm); 1293 } 1294 New->setParams(Params); 1295 } 1296 1297 AddKnownFunctionAttributes(New); 1298 1299 // TUScope is the translation-unit scope to insert this function into. 1300 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1301 // relate Scopes to DeclContexts, and probably eliminate CurContext 1302 // entirely, but we're not there yet. 1303 DeclContext *SavedContext = CurContext; 1304 CurContext = Context.getTranslationUnitDecl(); 1305 PushOnScopeChains(New, TUScope); 1306 CurContext = SavedContext; 1307 return New; 1308} 1309 1310/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1311/// same name and scope as a previous declaration 'Old'. Figure out 1312/// how to resolve this situation, merging decls or emitting 1313/// diagnostics as appropriate. If there was an error, set New to be invalid. 1314/// 1315void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1316 // If the new decl is known invalid already, don't bother doing any 1317 // merging checks. 1318 if (New->isInvalidDecl()) return; 1319 1320 // Allow multiple definitions for ObjC built-in typedefs. 1321 // FIXME: Verify the underlying types are equivalent! 1322 if (getLangOptions().ObjC1) { 1323 const IdentifierInfo *TypeID = New->getIdentifier(); 1324 switch (TypeID->getLength()) { 1325 default: break; 1326 case 2: 1327 if (!TypeID->isStr("id")) 1328 break; 1329 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1330 // Install the built-in type for 'id', ignoring the current definition. 1331 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1332 return; 1333 case 5: 1334 if (!TypeID->isStr("Class")) 1335 break; 1336 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1337 // Install the built-in type for 'Class', ignoring the current definition. 1338 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1339 return; 1340 case 3: 1341 if (!TypeID->isStr("SEL")) 1342 break; 1343 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1344 // Install the built-in type for 'SEL', ignoring the current definition. 1345 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1346 return; 1347 } 1348 // Fall through - the typedef name was not a builtin type. 1349 } 1350 1351 // Verify the old decl was also a type. 1352 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1353 if (!Old) { 1354 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1355 << New->getDeclName(); 1356 1357 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1358 if (OldD->getLocation().isValid()) 1359 Diag(OldD->getLocation(), diag::note_previous_definition); 1360 1361 return New->setInvalidDecl(); 1362 } 1363 1364 // If the old declaration is invalid, just give up here. 1365 if (Old->isInvalidDecl()) 1366 return New->setInvalidDecl(); 1367 1368 // Determine the "old" type we'll use for checking and diagnostics. 1369 QualType OldType; 1370 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1371 OldType = OldTypedef->getUnderlyingType(); 1372 else 1373 OldType = Context.getTypeDeclType(Old); 1374 1375 // If the typedef types are not identical, reject them in all languages and 1376 // with any extensions enabled. 1377 1378 if (OldType != New->getUnderlyingType() && 1379 Context.getCanonicalType(OldType) != 1380 Context.getCanonicalType(New->getUnderlyingType())) { 1381 int Kind = 0; 1382 if (isa<TypeAliasDecl>(Old)) 1383 Kind = 1; 1384 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1385 << Kind << New->getUnderlyingType() << OldType; 1386 if (Old->getLocation().isValid()) 1387 Diag(Old->getLocation(), diag::note_previous_definition); 1388 return New->setInvalidDecl(); 1389 } 1390 1391 // The types match. Link up the redeclaration chain if the old 1392 // declaration was a typedef. 1393 // FIXME: this is a potential source of weirdness if the type 1394 // spellings don't match exactly. 1395 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1396 New->setPreviousDeclaration(Typedef); 1397 1398 // __module_private__ is propagated to later declarations. 1399 if (Old->isModulePrivate()) 1400 New->setModulePrivate(); 1401 else if (New->isModulePrivate()) 1402 diagnoseModulePrivateRedeclaration(New, Old); 1403 1404 if (getLangOptions().MicrosoftExt) 1405 return; 1406 1407 if (getLangOptions().CPlusPlus) { 1408 // C++ [dcl.typedef]p2: 1409 // In a given non-class scope, a typedef specifier can be used to 1410 // redefine the name of any type declared in that scope to refer 1411 // to the type to which it already refers. 1412 if (!isa<CXXRecordDecl>(CurContext)) 1413 return; 1414 1415 // C++0x [dcl.typedef]p4: 1416 // In a given class scope, a typedef specifier can be used to redefine 1417 // any class-name declared in that scope that is not also a typedef-name 1418 // to refer to the type to which it already refers. 1419 // 1420 // This wording came in via DR424, which was a correction to the 1421 // wording in DR56, which accidentally banned code like: 1422 // 1423 // struct S { 1424 // typedef struct A { } A; 1425 // }; 1426 // 1427 // in the C++03 standard. We implement the C++0x semantics, which 1428 // allow the above but disallow 1429 // 1430 // struct S { 1431 // typedef int I; 1432 // typedef int I; 1433 // }; 1434 // 1435 // since that was the intent of DR56. 1436 if (!isa<TypedefNameDecl>(Old)) 1437 return; 1438 1439 Diag(New->getLocation(), diag::err_redefinition) 1440 << New->getDeclName(); 1441 Diag(Old->getLocation(), diag::note_previous_definition); 1442 return New->setInvalidDecl(); 1443 } 1444 1445 // If we have a redefinition of a typedef in C, emit a warning. This warning 1446 // is normally mapped to an error, but can be controlled with 1447 // -Wtypedef-redefinition. If either the original or the redefinition is 1448 // in a system header, don't emit this for compatibility with GCC. 1449 if (getDiagnostics().getSuppressSystemWarnings() && 1450 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1451 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1452 return; 1453 1454 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1455 << New->getDeclName(); 1456 Diag(Old->getLocation(), diag::note_previous_definition); 1457 return; 1458} 1459 1460/// DeclhasAttr - returns true if decl Declaration already has the target 1461/// attribute. 1462static bool 1463DeclHasAttr(const Decl *D, const Attr *A) { 1464 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1465 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1466 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1467 if ((*i)->getKind() == A->getKind()) { 1468 if (Ann) { 1469 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1470 return true; 1471 continue; 1472 } 1473 // FIXME: Don't hardcode this check 1474 if (OA && isa<OwnershipAttr>(*i)) 1475 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1476 return true; 1477 } 1478 1479 return false; 1480} 1481 1482/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1483static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1484 ASTContext &C, bool mergeDeprecation = true) { 1485 if (!oldDecl->hasAttrs()) 1486 return; 1487 1488 bool foundAny = newDecl->hasAttrs(); 1489 1490 // Ensure that any moving of objects within the allocated map is done before 1491 // we process them. 1492 if (!foundAny) newDecl->setAttrs(AttrVec()); 1493 1494 for (specific_attr_iterator<InheritableAttr> 1495 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1496 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1497 // Ignore deprecated/unavailable/availability attributes if requested. 1498 if (!mergeDeprecation && 1499 (isa<DeprecatedAttr>(*i) || 1500 isa<UnavailableAttr>(*i) || 1501 isa<AvailabilityAttr>(*i))) 1502 continue; 1503 1504 if (!DeclHasAttr(newDecl, *i)) { 1505 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1506 newAttr->setInherited(true); 1507 newDecl->addAttr(newAttr); 1508 foundAny = true; 1509 } 1510 } 1511 1512 if (!foundAny) newDecl->dropAttrs(); 1513} 1514 1515/// mergeParamDeclAttributes - Copy attributes from the old parameter 1516/// to the new one. 1517static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1518 const ParmVarDecl *oldDecl, 1519 ASTContext &C) { 1520 if (!oldDecl->hasAttrs()) 1521 return; 1522 1523 bool foundAny = newDecl->hasAttrs(); 1524 1525 // Ensure that any moving of objects within the allocated map is 1526 // done before we process them. 1527 if (!foundAny) newDecl->setAttrs(AttrVec()); 1528 1529 for (specific_attr_iterator<InheritableParamAttr> 1530 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1531 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1532 if (!DeclHasAttr(newDecl, *i)) { 1533 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1534 newAttr->setInherited(true); 1535 newDecl->addAttr(newAttr); 1536 foundAny = true; 1537 } 1538 } 1539 1540 if (!foundAny) newDecl->dropAttrs(); 1541} 1542 1543namespace { 1544 1545/// Used in MergeFunctionDecl to keep track of function parameters in 1546/// C. 1547struct GNUCompatibleParamWarning { 1548 ParmVarDecl *OldParm; 1549 ParmVarDecl *NewParm; 1550 QualType PromotedType; 1551}; 1552 1553} 1554 1555/// getSpecialMember - get the special member enum for a method. 1556Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1557 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1558 if (Ctor->isDefaultConstructor()) 1559 return Sema::CXXDefaultConstructor; 1560 1561 if (Ctor->isCopyConstructor()) 1562 return Sema::CXXCopyConstructor; 1563 1564 if (Ctor->isMoveConstructor()) 1565 return Sema::CXXMoveConstructor; 1566 } else if (isa<CXXDestructorDecl>(MD)) { 1567 return Sema::CXXDestructor; 1568 } else if (MD->isCopyAssignmentOperator()) { 1569 return Sema::CXXCopyAssignment; 1570 } else if (MD->isMoveAssignmentOperator()) { 1571 return Sema::CXXMoveAssignment; 1572 } 1573 1574 return Sema::CXXInvalid; 1575} 1576 1577/// canRedefineFunction - checks if a function can be redefined. Currently, 1578/// only extern inline functions can be redefined, and even then only in 1579/// GNU89 mode. 1580static bool canRedefineFunction(const FunctionDecl *FD, 1581 const LangOptions& LangOpts) { 1582 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1583 !LangOpts.CPlusPlus && 1584 FD->isInlineSpecified() && 1585 FD->getStorageClass() == SC_Extern); 1586} 1587 1588/// MergeFunctionDecl - We just parsed a function 'New' from 1589/// declarator D which has the same name and scope as a previous 1590/// declaration 'Old'. Figure out how to resolve this situation, 1591/// merging decls or emitting diagnostics as appropriate. 1592/// 1593/// In C++, New and Old must be declarations that are not 1594/// overloaded. Use IsOverload to determine whether New and Old are 1595/// overloaded, and to select the Old declaration that New should be 1596/// merged with. 1597/// 1598/// Returns true if there was an error, false otherwise. 1599bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1600 // Verify the old decl was also a function. 1601 FunctionDecl *Old = 0; 1602 if (FunctionTemplateDecl *OldFunctionTemplate 1603 = dyn_cast<FunctionTemplateDecl>(OldD)) 1604 Old = OldFunctionTemplate->getTemplatedDecl(); 1605 else 1606 Old = dyn_cast<FunctionDecl>(OldD); 1607 if (!Old) { 1608 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1609 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1610 Diag(Shadow->getTargetDecl()->getLocation(), 1611 diag::note_using_decl_target); 1612 Diag(Shadow->getUsingDecl()->getLocation(), 1613 diag::note_using_decl) << 0; 1614 return true; 1615 } 1616 1617 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1618 << New->getDeclName(); 1619 Diag(OldD->getLocation(), diag::note_previous_definition); 1620 return true; 1621 } 1622 1623 // Determine whether the previous declaration was a definition, 1624 // implicit declaration, or a declaration. 1625 diag::kind PrevDiag; 1626 if (Old->isThisDeclarationADefinition()) 1627 PrevDiag = diag::note_previous_definition; 1628 else if (Old->isImplicit()) 1629 PrevDiag = diag::note_previous_implicit_declaration; 1630 else 1631 PrevDiag = diag::note_previous_declaration; 1632 1633 QualType OldQType = Context.getCanonicalType(Old->getType()); 1634 QualType NewQType = Context.getCanonicalType(New->getType()); 1635 1636 // Don't complain about this if we're in GNU89 mode and the old function 1637 // is an extern inline function. 1638 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1639 New->getStorageClass() == SC_Static && 1640 Old->getStorageClass() != SC_Static && 1641 !canRedefineFunction(Old, getLangOptions())) { 1642 if (getLangOptions().MicrosoftExt) { 1643 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1644 Diag(Old->getLocation(), PrevDiag); 1645 } else { 1646 Diag(New->getLocation(), diag::err_static_non_static) << New; 1647 Diag(Old->getLocation(), PrevDiag); 1648 return true; 1649 } 1650 } 1651 1652 // If a function is first declared with a calling convention, but is 1653 // later declared or defined without one, the second decl assumes the 1654 // calling convention of the first. 1655 // 1656 // For the new decl, we have to look at the NON-canonical type to tell the 1657 // difference between a function that really doesn't have a calling 1658 // convention and one that is declared cdecl. That's because in 1659 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1660 // because it is the default calling convention. 1661 // 1662 // Note also that we DO NOT return at this point, because we still have 1663 // other tests to run. 1664 const FunctionType *OldType = cast<FunctionType>(OldQType); 1665 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1666 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1667 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1668 bool RequiresAdjustment = false; 1669 if (OldTypeInfo.getCC() != CC_Default && 1670 NewTypeInfo.getCC() == CC_Default) { 1671 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1672 RequiresAdjustment = true; 1673 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1674 NewTypeInfo.getCC())) { 1675 // Calling conventions really aren't compatible, so complain. 1676 Diag(New->getLocation(), diag::err_cconv_change) 1677 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1678 << (OldTypeInfo.getCC() == CC_Default) 1679 << (OldTypeInfo.getCC() == CC_Default ? "" : 1680 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1681 Diag(Old->getLocation(), diag::note_previous_declaration); 1682 return true; 1683 } 1684 1685 // FIXME: diagnose the other way around? 1686 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1687 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1688 RequiresAdjustment = true; 1689 } 1690 1691 // Merge regparm attribute. 1692 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1693 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1694 if (NewTypeInfo.getHasRegParm()) { 1695 Diag(New->getLocation(), diag::err_regparm_mismatch) 1696 << NewType->getRegParmType() 1697 << OldType->getRegParmType(); 1698 Diag(Old->getLocation(), diag::note_previous_declaration); 1699 return true; 1700 } 1701 1702 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1703 RequiresAdjustment = true; 1704 } 1705 1706 if (RequiresAdjustment) { 1707 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1708 New->setType(QualType(NewType, 0)); 1709 NewQType = Context.getCanonicalType(New->getType()); 1710 } 1711 1712 if (getLangOptions().CPlusPlus) { 1713 // (C++98 13.1p2): 1714 // Certain function declarations cannot be overloaded: 1715 // -- Function declarations that differ only in the return type 1716 // cannot be overloaded. 1717 QualType OldReturnType = OldType->getResultType(); 1718 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1719 QualType ResQT; 1720 if (OldReturnType != NewReturnType) { 1721 if (NewReturnType->isObjCObjectPointerType() 1722 && OldReturnType->isObjCObjectPointerType()) 1723 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1724 if (ResQT.isNull()) { 1725 if (New->isCXXClassMember() && New->isOutOfLine()) 1726 Diag(New->getLocation(), 1727 diag::err_member_def_does_not_match_ret_type) << New; 1728 else 1729 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1730 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1731 return true; 1732 } 1733 else 1734 NewQType = ResQT; 1735 } 1736 1737 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1738 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1739 if (OldMethod && NewMethod) { 1740 // Preserve triviality. 1741 NewMethod->setTrivial(OldMethod->isTrivial()); 1742 1743 // MSVC allows explicit template specialization at class scope: 1744 // 2 CXMethodDecls referring to the same function will be injected. 1745 // We don't want a redeclartion error. 1746 bool IsClassScopeExplicitSpecialization = 1747 OldMethod->isFunctionTemplateSpecialization() && 1748 NewMethod->isFunctionTemplateSpecialization(); 1749 bool isFriend = NewMethod->getFriendObjectKind(); 1750 1751 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1752 !IsClassScopeExplicitSpecialization) { 1753 // -- Member function declarations with the same name and the 1754 // same parameter types cannot be overloaded if any of them 1755 // is a static member function declaration. 1756 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1757 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1758 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1759 return true; 1760 } 1761 1762 // C++ [class.mem]p1: 1763 // [...] A member shall not be declared twice in the 1764 // member-specification, except that a nested class or member 1765 // class template can be declared and then later defined. 1766 unsigned NewDiag; 1767 if (isa<CXXConstructorDecl>(OldMethod)) 1768 NewDiag = diag::err_constructor_redeclared; 1769 else if (isa<CXXDestructorDecl>(NewMethod)) 1770 NewDiag = diag::err_destructor_redeclared; 1771 else if (isa<CXXConversionDecl>(NewMethod)) 1772 NewDiag = diag::err_conv_function_redeclared; 1773 else 1774 NewDiag = diag::err_member_redeclared; 1775 1776 Diag(New->getLocation(), NewDiag); 1777 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1778 1779 // Complain if this is an explicit declaration of a special 1780 // member that was initially declared implicitly. 1781 // 1782 // As an exception, it's okay to befriend such methods in order 1783 // to permit the implicit constructor/destructor/operator calls. 1784 } else if (OldMethod->isImplicit()) { 1785 if (isFriend) { 1786 NewMethod->setImplicit(); 1787 } else { 1788 Diag(NewMethod->getLocation(), 1789 diag::err_definition_of_implicitly_declared_member) 1790 << New << getSpecialMember(OldMethod); 1791 return true; 1792 } 1793 } else if (OldMethod->isExplicitlyDefaulted()) { 1794 Diag(NewMethod->getLocation(), 1795 diag::err_definition_of_explicitly_defaulted_member) 1796 << getSpecialMember(OldMethod); 1797 return true; 1798 } 1799 } 1800 1801 // (C++98 8.3.5p3): 1802 // All declarations for a function shall agree exactly in both the 1803 // return type and the parameter-type-list. 1804 // We also want to respect all the extended bits except noreturn. 1805 1806 // noreturn should now match unless the old type info didn't have it. 1807 QualType OldQTypeForComparison = OldQType; 1808 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1809 assert(OldQType == QualType(OldType, 0)); 1810 const FunctionType *OldTypeForComparison 1811 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1812 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1813 assert(OldQTypeForComparison.isCanonical()); 1814 } 1815 1816 if (OldQTypeForComparison == NewQType) 1817 return MergeCompatibleFunctionDecls(New, Old); 1818 1819 // Fall through for conflicting redeclarations and redefinitions. 1820 } 1821 1822 // C: Function types need to be compatible, not identical. This handles 1823 // duplicate function decls like "void f(int); void f(enum X);" properly. 1824 if (!getLangOptions().CPlusPlus && 1825 Context.typesAreCompatible(OldQType, NewQType)) { 1826 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1827 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1828 const FunctionProtoType *OldProto = 0; 1829 if (isa<FunctionNoProtoType>(NewFuncType) && 1830 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1831 // The old declaration provided a function prototype, but the 1832 // new declaration does not. Merge in the prototype. 1833 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1834 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1835 OldProto->arg_type_end()); 1836 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1837 ParamTypes.data(), ParamTypes.size(), 1838 OldProto->getExtProtoInfo()); 1839 New->setType(NewQType); 1840 New->setHasInheritedPrototype(); 1841 1842 // Synthesize a parameter for each argument type. 1843 SmallVector<ParmVarDecl*, 16> Params; 1844 for (FunctionProtoType::arg_type_iterator 1845 ParamType = OldProto->arg_type_begin(), 1846 ParamEnd = OldProto->arg_type_end(); 1847 ParamType != ParamEnd; ++ParamType) { 1848 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1849 SourceLocation(), 1850 SourceLocation(), 0, 1851 *ParamType, /*TInfo=*/0, 1852 SC_None, SC_None, 1853 0); 1854 Param->setScopeInfo(0, Params.size()); 1855 Param->setImplicit(); 1856 Params.push_back(Param); 1857 } 1858 1859 New->setParams(Params); 1860 } 1861 1862 return MergeCompatibleFunctionDecls(New, Old); 1863 } 1864 1865 // GNU C permits a K&R definition to follow a prototype declaration 1866 // if the declared types of the parameters in the K&R definition 1867 // match the types in the prototype declaration, even when the 1868 // promoted types of the parameters from the K&R definition differ 1869 // from the types in the prototype. GCC then keeps the types from 1870 // the prototype. 1871 // 1872 // If a variadic prototype is followed by a non-variadic K&R definition, 1873 // the K&R definition becomes variadic. This is sort of an edge case, but 1874 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1875 // C99 6.9.1p8. 1876 if (!getLangOptions().CPlusPlus && 1877 Old->hasPrototype() && !New->hasPrototype() && 1878 New->getType()->getAs<FunctionProtoType>() && 1879 Old->getNumParams() == New->getNumParams()) { 1880 SmallVector<QualType, 16> ArgTypes; 1881 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1882 const FunctionProtoType *OldProto 1883 = Old->getType()->getAs<FunctionProtoType>(); 1884 const FunctionProtoType *NewProto 1885 = New->getType()->getAs<FunctionProtoType>(); 1886 1887 // Determine whether this is the GNU C extension. 1888 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1889 NewProto->getResultType()); 1890 bool LooseCompatible = !MergedReturn.isNull(); 1891 for (unsigned Idx = 0, End = Old->getNumParams(); 1892 LooseCompatible && Idx != End; ++Idx) { 1893 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1894 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1895 if (Context.typesAreCompatible(OldParm->getType(), 1896 NewProto->getArgType(Idx))) { 1897 ArgTypes.push_back(NewParm->getType()); 1898 } else if (Context.typesAreCompatible(OldParm->getType(), 1899 NewParm->getType(), 1900 /*CompareUnqualified=*/true)) { 1901 GNUCompatibleParamWarning Warn 1902 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1903 Warnings.push_back(Warn); 1904 ArgTypes.push_back(NewParm->getType()); 1905 } else 1906 LooseCompatible = false; 1907 } 1908 1909 if (LooseCompatible) { 1910 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1911 Diag(Warnings[Warn].NewParm->getLocation(), 1912 diag::ext_param_promoted_not_compatible_with_prototype) 1913 << Warnings[Warn].PromotedType 1914 << Warnings[Warn].OldParm->getType(); 1915 if (Warnings[Warn].OldParm->getLocation().isValid()) 1916 Diag(Warnings[Warn].OldParm->getLocation(), 1917 diag::note_previous_declaration); 1918 } 1919 1920 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1921 ArgTypes.size(), 1922 OldProto->getExtProtoInfo())); 1923 return MergeCompatibleFunctionDecls(New, Old); 1924 } 1925 1926 // Fall through to diagnose conflicting types. 1927 } 1928 1929 // A function that has already been declared has been redeclared or defined 1930 // with a different type- show appropriate diagnostic 1931 if (unsigned BuiltinID = Old->getBuiltinID()) { 1932 // The user has declared a builtin function with an incompatible 1933 // signature. 1934 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1935 // The function the user is redeclaring is a library-defined 1936 // function like 'malloc' or 'printf'. Warn about the 1937 // redeclaration, then pretend that we don't know about this 1938 // library built-in. 1939 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1940 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1941 << Old << Old->getType(); 1942 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1943 Old->setInvalidDecl(); 1944 return false; 1945 } 1946 1947 PrevDiag = diag::note_previous_builtin_declaration; 1948 } 1949 1950 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1951 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1952 return true; 1953} 1954 1955/// \brief Completes the merge of two function declarations that are 1956/// known to be compatible. 1957/// 1958/// This routine handles the merging of attributes and other 1959/// properties of function declarations form the old declaration to 1960/// the new declaration, once we know that New is in fact a 1961/// redeclaration of Old. 1962/// 1963/// \returns false 1964bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1965 // Merge the attributes 1966 mergeDeclAttributes(New, Old, Context); 1967 1968 // Merge the storage class. 1969 if (Old->getStorageClass() != SC_Extern && 1970 Old->getStorageClass() != SC_None) 1971 New->setStorageClass(Old->getStorageClass()); 1972 1973 // Merge "pure" flag. 1974 if (Old->isPure()) 1975 New->setPure(); 1976 1977 // __module_private__ is propagated to later declarations. 1978 if (Old->isModulePrivate()) 1979 New->setModulePrivate(); 1980 else if (New->isModulePrivate()) 1981 diagnoseModulePrivateRedeclaration(New, Old); 1982 1983 // Merge attributes from the parameters. These can mismatch with K&R 1984 // declarations. 1985 if (New->getNumParams() == Old->getNumParams()) 1986 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1987 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1988 Context); 1989 1990 if (getLangOptions().CPlusPlus) 1991 return MergeCXXFunctionDecl(New, Old); 1992 1993 return false; 1994} 1995 1996 1997void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1998 const ObjCMethodDecl *oldMethod) { 1999 // We don't want to merge unavailable and deprecated attributes 2000 // except from interface to implementation. 2001 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2002 2003 // Merge the attributes. 2004 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2005 2006 // Merge attributes from the parameters. 2007 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2008 for (ObjCMethodDecl::param_iterator 2009 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2010 ni != ne; ++ni, ++oi) 2011 mergeParamDeclAttributes(*ni, *oi, Context); 2012 2013 CheckObjCMethodOverride(newMethod, oldMethod, true); 2014} 2015 2016/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2017/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2018/// emitting diagnostics as appropriate. 2019/// 2020/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2021/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2022/// check them before the initializer is attached. 2023/// 2024void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2025 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2026 return; 2027 2028 QualType MergedT; 2029 if (getLangOptions().CPlusPlus) { 2030 AutoType *AT = New->getType()->getContainedAutoType(); 2031 if (AT && !AT->isDeduced()) { 2032 // We don't know what the new type is until the initializer is attached. 2033 return; 2034 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2035 // These could still be something that needs exception specs checked. 2036 return MergeVarDeclExceptionSpecs(New, Old); 2037 } 2038 // C++ [basic.link]p10: 2039 // [...] the types specified by all declarations referring to a given 2040 // object or function shall be identical, except that declarations for an 2041 // array object can specify array types that differ by the presence or 2042 // absence of a major array bound (8.3.4). 2043 else if (Old->getType()->isIncompleteArrayType() && 2044 New->getType()->isArrayType()) { 2045 CanQual<ArrayType> OldArray 2046 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2047 CanQual<ArrayType> NewArray 2048 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2049 if (OldArray->getElementType() == NewArray->getElementType()) 2050 MergedT = New->getType(); 2051 } else if (Old->getType()->isArrayType() && 2052 New->getType()->isIncompleteArrayType()) { 2053 CanQual<ArrayType> OldArray 2054 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2055 CanQual<ArrayType> NewArray 2056 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2057 if (OldArray->getElementType() == NewArray->getElementType()) 2058 MergedT = Old->getType(); 2059 } else if (New->getType()->isObjCObjectPointerType() 2060 && Old->getType()->isObjCObjectPointerType()) { 2061 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2062 Old->getType()); 2063 } 2064 } else { 2065 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2066 } 2067 if (MergedT.isNull()) { 2068 Diag(New->getLocation(), diag::err_redefinition_different_type) 2069 << New->getDeclName(); 2070 Diag(Old->getLocation(), diag::note_previous_definition); 2071 return New->setInvalidDecl(); 2072 } 2073 New->setType(MergedT); 2074} 2075 2076/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2077/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2078/// situation, merging decls or emitting diagnostics as appropriate. 2079/// 2080/// Tentative definition rules (C99 6.9.2p2) are checked by 2081/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2082/// definitions here, since the initializer hasn't been attached. 2083/// 2084void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2085 // If the new decl is already invalid, don't do any other checking. 2086 if (New->isInvalidDecl()) 2087 return; 2088 2089 // Verify the old decl was also a variable. 2090 VarDecl *Old = 0; 2091 if (!Previous.isSingleResult() || 2092 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2093 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2094 << New->getDeclName(); 2095 Diag(Previous.getRepresentativeDecl()->getLocation(), 2096 diag::note_previous_definition); 2097 return New->setInvalidDecl(); 2098 } 2099 2100 // C++ [class.mem]p1: 2101 // A member shall not be declared twice in the member-specification [...] 2102 // 2103 // Here, we need only consider static data members. 2104 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2105 Diag(New->getLocation(), diag::err_duplicate_member) 2106 << New->getIdentifier(); 2107 Diag(Old->getLocation(), diag::note_previous_declaration); 2108 New->setInvalidDecl(); 2109 } 2110 2111 mergeDeclAttributes(New, Old, Context); 2112 // Warn if an already-declared variable is made a weak_import in a subsequent declaration 2113 if (New->getAttr<WeakImportAttr>() && 2114 Old->getStorageClass() == SC_None && 2115 !Old->getAttr<WeakImportAttr>()) { 2116 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2117 Diag(Old->getLocation(), diag::note_previous_definition); 2118 // Remove weak_import attribute on new declaration. 2119 New->dropAttr<WeakImportAttr>(); 2120 } 2121 2122 // Merge the types. 2123 MergeVarDeclTypes(New, Old); 2124 if (New->isInvalidDecl()) 2125 return; 2126 2127 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2128 if (New->getStorageClass() == SC_Static && 2129 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2130 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2131 Diag(Old->getLocation(), diag::note_previous_definition); 2132 return New->setInvalidDecl(); 2133 } 2134 // C99 6.2.2p4: 2135 // For an identifier declared with the storage-class specifier 2136 // extern in a scope in which a prior declaration of that 2137 // identifier is visible,23) if the prior declaration specifies 2138 // internal or external linkage, the linkage of the identifier at 2139 // the later declaration is the same as the linkage specified at 2140 // the prior declaration. If no prior declaration is visible, or 2141 // if the prior declaration specifies no linkage, then the 2142 // identifier has external linkage. 2143 if (New->hasExternalStorage() && Old->hasLinkage()) 2144 /* Okay */; 2145 else if (New->getStorageClass() != SC_Static && 2146 Old->getStorageClass() == SC_Static) { 2147 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2148 Diag(Old->getLocation(), diag::note_previous_definition); 2149 return New->setInvalidDecl(); 2150 } 2151 2152 // Check if extern is followed by non-extern and vice-versa. 2153 if (New->hasExternalStorage() && 2154 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2155 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2156 Diag(Old->getLocation(), diag::note_previous_definition); 2157 return New->setInvalidDecl(); 2158 } 2159 if (Old->hasExternalStorage() && 2160 !New->hasLinkage() && New->isLocalVarDecl()) { 2161 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2162 Diag(Old->getLocation(), diag::note_previous_definition); 2163 return New->setInvalidDecl(); 2164 } 2165 2166 // __module_private__ is propagated to later declarations. 2167 if (Old->isModulePrivate()) 2168 New->setModulePrivate(); 2169 else if (New->isModulePrivate()) 2170 diagnoseModulePrivateRedeclaration(New, Old); 2171 2172 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2173 2174 // FIXME: The test for external storage here seems wrong? We still 2175 // need to check for mismatches. 2176 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2177 // Don't complain about out-of-line definitions of static members. 2178 !(Old->getLexicalDeclContext()->isRecord() && 2179 !New->getLexicalDeclContext()->isRecord())) { 2180 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2181 Diag(Old->getLocation(), diag::note_previous_definition); 2182 return New->setInvalidDecl(); 2183 } 2184 2185 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2186 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2187 Diag(Old->getLocation(), diag::note_previous_definition); 2188 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2189 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2190 Diag(Old->getLocation(), diag::note_previous_definition); 2191 } 2192 2193 // C++ doesn't have tentative definitions, so go right ahead and check here. 2194 const VarDecl *Def; 2195 if (getLangOptions().CPlusPlus && 2196 New->isThisDeclarationADefinition() == VarDecl::Definition && 2197 (Def = Old->getDefinition())) { 2198 Diag(New->getLocation(), diag::err_redefinition) 2199 << New->getDeclName(); 2200 Diag(Def->getLocation(), diag::note_previous_definition); 2201 New->setInvalidDecl(); 2202 return; 2203 } 2204 // c99 6.2.2 P4. 2205 // For an identifier declared with the storage-class specifier extern in a 2206 // scope in which a prior declaration of that identifier is visible, if 2207 // the prior declaration specifies internal or external linkage, the linkage 2208 // of the identifier at the later declaration is the same as the linkage 2209 // specified at the prior declaration. 2210 // FIXME. revisit this code. 2211 if (New->hasExternalStorage() && 2212 Old->getLinkage() == InternalLinkage && 2213 New->getDeclContext() == Old->getDeclContext()) 2214 New->setStorageClass(Old->getStorageClass()); 2215 2216 // Keep a chain of previous declarations. 2217 New->setPreviousDeclaration(Old); 2218 2219 // Inherit access appropriately. 2220 New->setAccess(Old->getAccess()); 2221} 2222 2223/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2224/// no declarator (e.g. "struct foo;") is parsed. 2225Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2226 DeclSpec &DS) { 2227 return ParsedFreeStandingDeclSpec(S, AS, DS, 2228 MultiTemplateParamsArg(*this, 0, 0)); 2229} 2230 2231/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2232/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2233/// parameters to cope with template friend declarations. 2234Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2235 DeclSpec &DS, 2236 MultiTemplateParamsArg TemplateParams) { 2237 Decl *TagD = 0; 2238 TagDecl *Tag = 0; 2239 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2240 DS.getTypeSpecType() == DeclSpec::TST_struct || 2241 DS.getTypeSpecType() == DeclSpec::TST_union || 2242 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2243 TagD = DS.getRepAsDecl(); 2244 2245 if (!TagD) // We probably had an error 2246 return 0; 2247 2248 // Note that the above type specs guarantee that the 2249 // type rep is a Decl, whereas in many of the others 2250 // it's a Type. 2251 Tag = dyn_cast<TagDecl>(TagD); 2252 } 2253 2254 if (Tag) 2255 Tag->setFreeStanding(); 2256 2257 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2258 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2259 // or incomplete types shall not be restrict-qualified." 2260 if (TypeQuals & DeclSpec::TQ_restrict) 2261 Diag(DS.getRestrictSpecLoc(), 2262 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2263 << DS.getSourceRange(); 2264 } 2265 2266 if (DS.isConstexprSpecified()) { 2267 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2268 // and definitions of functions and variables. 2269 if (Tag) 2270 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2271 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2272 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2273 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2274 else 2275 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2276 // Don't emit warnings after this error. 2277 return TagD; 2278 } 2279 2280 if (DS.isFriendSpecified()) { 2281 // If we're dealing with a decl but not a TagDecl, assume that 2282 // whatever routines created it handled the friendship aspect. 2283 if (TagD && !Tag) 2284 return 0; 2285 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2286 } 2287 2288 // Track whether we warned about the fact that there aren't any 2289 // declarators. 2290 bool emittedWarning = false; 2291 2292 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2293 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2294 2295 if (!Record->getDeclName() && Record->isDefinition() && 2296 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2297 if (getLangOptions().CPlusPlus || 2298 Record->getDeclContext()->isRecord()) 2299 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2300 2301 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2302 << DS.getSourceRange(); 2303 emittedWarning = true; 2304 } 2305 } 2306 2307 // Check for Microsoft C extension: anonymous struct. 2308 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2309 CurContext->isRecord() && 2310 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2311 // Handle 2 kinds of anonymous struct: 2312 // struct STRUCT; 2313 // and 2314 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2315 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2316 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2317 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2318 DS.getRepAsType().get()->isStructureType())) { 2319 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2320 << DS.getSourceRange(); 2321 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2322 } 2323 } 2324 2325 if (getLangOptions().CPlusPlus && 2326 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2327 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2328 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2329 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2330 Diag(Enum->getLocation(), diag::ext_no_declarators) 2331 << DS.getSourceRange(); 2332 emittedWarning = true; 2333 } 2334 2335 // Skip all the checks below if we have a type error. 2336 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2337 2338 if (!DS.isMissingDeclaratorOk()) { 2339 // Warn about typedefs of enums without names, since this is an 2340 // extension in both Microsoft and GNU. 2341 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2342 Tag && isa<EnumDecl>(Tag)) { 2343 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2344 << DS.getSourceRange(); 2345 return Tag; 2346 } 2347 2348 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2349 << DS.getSourceRange(); 2350 emittedWarning = true; 2351 } 2352 2353 // We're going to complain about a bunch of spurious specifiers; 2354 // only do this if we're declaring a tag, because otherwise we 2355 // should be getting diag::ext_no_declarators. 2356 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2357 return TagD; 2358 2359 // Note that a linkage-specification sets a storage class, but 2360 // 'extern "C" struct foo;' is actually valid and not theoretically 2361 // useless. 2362 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2363 if (!DS.isExternInLinkageSpec()) 2364 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2365 << DeclSpec::getSpecifierName(scs); 2366 2367 if (DS.isThreadSpecified()) 2368 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2369 if (DS.getTypeQualifiers()) { 2370 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2371 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2372 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2373 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2374 // Restrict is covered above. 2375 } 2376 if (DS.isInlineSpecified()) 2377 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2378 if (DS.isVirtualSpecified()) 2379 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2380 if (DS.isExplicitSpecified()) 2381 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2382 2383 if (DS.isModulePrivateSpecified() && 2384 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2385 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2386 << Tag->getTagKind() 2387 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2388 2389 // FIXME: Warn on useless attributes 2390 2391 return TagD; 2392} 2393 2394/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2395/// builds a statement for it and returns it so it is evaluated. 2396StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2397 StmtResult R; 2398 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2399 Expr *Exp = DS.getRepAsExpr(); 2400 QualType Ty = Exp->getType(); 2401 if (Ty->isPointerType()) { 2402 do 2403 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2404 while (Ty->isPointerType()); 2405 } 2406 if (Ty->isVariableArrayType()) { 2407 R = ActOnExprStmt(MakeFullExpr(Exp)); 2408 } 2409 } 2410 return R; 2411} 2412 2413/// We are trying to inject an anonymous member into the given scope; 2414/// check if there's an existing declaration that can't be overloaded. 2415/// 2416/// \return true if this is a forbidden redeclaration 2417static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2418 Scope *S, 2419 DeclContext *Owner, 2420 DeclarationName Name, 2421 SourceLocation NameLoc, 2422 unsigned diagnostic) { 2423 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2424 Sema::ForRedeclaration); 2425 if (!SemaRef.LookupName(R, S)) return false; 2426 2427 if (R.getAsSingle<TagDecl>()) 2428 return false; 2429 2430 // Pick a representative declaration. 2431 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2432 assert(PrevDecl && "Expected a non-null Decl"); 2433 2434 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2435 return false; 2436 2437 SemaRef.Diag(NameLoc, diagnostic) << Name; 2438 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2439 2440 return true; 2441} 2442 2443/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2444/// anonymous struct or union AnonRecord into the owning context Owner 2445/// and scope S. This routine will be invoked just after we realize 2446/// that an unnamed union or struct is actually an anonymous union or 2447/// struct, e.g., 2448/// 2449/// @code 2450/// union { 2451/// int i; 2452/// float f; 2453/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2454/// // f into the surrounding scope.x 2455/// @endcode 2456/// 2457/// This routine is recursive, injecting the names of nested anonymous 2458/// structs/unions into the owning context and scope as well. 2459static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2460 DeclContext *Owner, 2461 RecordDecl *AnonRecord, 2462 AccessSpecifier AS, 2463 SmallVector<NamedDecl*, 2> &Chaining, 2464 bool MSAnonStruct) { 2465 unsigned diagKind 2466 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2467 : diag::err_anonymous_struct_member_redecl; 2468 2469 bool Invalid = false; 2470 2471 // Look every FieldDecl and IndirectFieldDecl with a name. 2472 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2473 DEnd = AnonRecord->decls_end(); 2474 D != DEnd; ++D) { 2475 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2476 cast<NamedDecl>(*D)->getDeclName()) { 2477 ValueDecl *VD = cast<ValueDecl>(*D); 2478 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2479 VD->getLocation(), diagKind)) { 2480 // C++ [class.union]p2: 2481 // The names of the members of an anonymous union shall be 2482 // distinct from the names of any other entity in the 2483 // scope in which the anonymous union is declared. 2484 Invalid = true; 2485 } else { 2486 // C++ [class.union]p2: 2487 // For the purpose of name lookup, after the anonymous union 2488 // definition, the members of the anonymous union are 2489 // considered to have been defined in the scope in which the 2490 // anonymous union is declared. 2491 unsigned OldChainingSize = Chaining.size(); 2492 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2493 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2494 PE = IF->chain_end(); PI != PE; ++PI) 2495 Chaining.push_back(*PI); 2496 else 2497 Chaining.push_back(VD); 2498 2499 assert(Chaining.size() >= 2); 2500 NamedDecl **NamedChain = 2501 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2502 for (unsigned i = 0; i < Chaining.size(); i++) 2503 NamedChain[i] = Chaining[i]; 2504 2505 IndirectFieldDecl* IndirectField = 2506 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2507 VD->getIdentifier(), VD->getType(), 2508 NamedChain, Chaining.size()); 2509 2510 IndirectField->setAccess(AS); 2511 IndirectField->setImplicit(); 2512 SemaRef.PushOnScopeChains(IndirectField, S); 2513 2514 // That includes picking up the appropriate access specifier. 2515 if (AS != AS_none) IndirectField->setAccess(AS); 2516 2517 Chaining.resize(OldChainingSize); 2518 } 2519 } 2520 } 2521 2522 return Invalid; 2523} 2524 2525/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2526/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2527/// illegal input values are mapped to SC_None. 2528static StorageClass 2529StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2530 switch (StorageClassSpec) { 2531 case DeclSpec::SCS_unspecified: return SC_None; 2532 case DeclSpec::SCS_extern: return SC_Extern; 2533 case DeclSpec::SCS_static: return SC_Static; 2534 case DeclSpec::SCS_auto: return SC_Auto; 2535 case DeclSpec::SCS_register: return SC_Register; 2536 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2537 // Illegal SCSs map to None: error reporting is up to the caller. 2538 case DeclSpec::SCS_mutable: // Fall through. 2539 case DeclSpec::SCS_typedef: return SC_None; 2540 } 2541 llvm_unreachable("unknown storage class specifier"); 2542} 2543 2544/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2545/// a StorageClass. Any error reporting is up to the caller: 2546/// illegal input values are mapped to SC_None. 2547static StorageClass 2548StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2549 switch (StorageClassSpec) { 2550 case DeclSpec::SCS_unspecified: return SC_None; 2551 case DeclSpec::SCS_extern: return SC_Extern; 2552 case DeclSpec::SCS_static: return SC_Static; 2553 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2554 // Illegal SCSs map to None: error reporting is up to the caller. 2555 case DeclSpec::SCS_auto: // Fall through. 2556 case DeclSpec::SCS_mutable: // Fall through. 2557 case DeclSpec::SCS_register: // Fall through. 2558 case DeclSpec::SCS_typedef: return SC_None; 2559 } 2560 llvm_unreachable("unknown storage class specifier"); 2561} 2562 2563/// BuildAnonymousStructOrUnion - Handle the declaration of an 2564/// anonymous structure or union. Anonymous unions are a C++ feature 2565/// (C++ [class.union]) and a GNU C extension; anonymous structures 2566/// are a GNU C and GNU C++ extension. 2567Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2568 AccessSpecifier AS, 2569 RecordDecl *Record) { 2570 DeclContext *Owner = Record->getDeclContext(); 2571 2572 // Diagnose whether this anonymous struct/union is an extension. 2573 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2574 Diag(Record->getLocation(), diag::ext_anonymous_union); 2575 else if (!Record->isUnion()) 2576 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2577 2578 // C and C++ require different kinds of checks for anonymous 2579 // structs/unions. 2580 bool Invalid = false; 2581 if (getLangOptions().CPlusPlus) { 2582 const char* PrevSpec = 0; 2583 unsigned DiagID; 2584 // C++ [class.union]p3: 2585 // Anonymous unions declared in a named namespace or in the 2586 // global namespace shall be declared static. 2587 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2588 (isa<TranslationUnitDecl>(Owner) || 2589 (isa<NamespaceDecl>(Owner) && 2590 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2591 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2592 Invalid = true; 2593 2594 // Recover by adding 'static'. 2595 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2596 PrevSpec, DiagID); 2597 } 2598 // C++ [class.union]p3: 2599 // A storage class is not allowed in a declaration of an 2600 // anonymous union in a class scope. 2601 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2602 isa<RecordDecl>(Owner)) { 2603 Diag(DS.getStorageClassSpecLoc(), 2604 diag::err_anonymous_union_with_storage_spec); 2605 Invalid = true; 2606 2607 // Recover by removing the storage specifier. 2608 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, SourceLocation(), 2609 PrevSpec, DiagID); 2610 } 2611 2612 // Ignore const/volatile/restrict qualifiers. 2613 if (DS.getTypeQualifiers()) { 2614 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2615 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2616 << Record->isUnion() << 0 2617 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2618 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2619 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2620 << Record->isUnion() << 1 2621 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2622 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2623 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2624 << Record->isUnion() << 2 2625 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2626 2627 DS.ClearTypeQualifiers(); 2628 } 2629 2630 // C++ [class.union]p2: 2631 // The member-specification of an anonymous union shall only 2632 // define non-static data members. [Note: nested types and 2633 // functions cannot be declared within an anonymous union. ] 2634 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2635 MemEnd = Record->decls_end(); 2636 Mem != MemEnd; ++Mem) { 2637 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2638 // C++ [class.union]p3: 2639 // An anonymous union shall not have private or protected 2640 // members (clause 11). 2641 assert(FD->getAccess() != AS_none); 2642 if (FD->getAccess() != AS_public) { 2643 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2644 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2645 Invalid = true; 2646 } 2647 2648 // C++ [class.union]p1 2649 // An object of a class with a non-trivial constructor, a non-trivial 2650 // copy constructor, a non-trivial destructor, or a non-trivial copy 2651 // assignment operator cannot be a member of a union, nor can an 2652 // array of such objects. 2653 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2654 Invalid = true; 2655 } else if ((*Mem)->isImplicit()) { 2656 // Any implicit members are fine. 2657 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2658 // This is a type that showed up in an 2659 // elaborated-type-specifier inside the anonymous struct or 2660 // union, but which actually declares a type outside of the 2661 // anonymous struct or union. It's okay. 2662 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2663 if (!MemRecord->isAnonymousStructOrUnion() && 2664 MemRecord->getDeclName()) { 2665 // Visual C++ allows type definition in anonymous struct or union. 2666 if (getLangOptions().MicrosoftExt) 2667 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2668 << (int)Record->isUnion(); 2669 else { 2670 // This is a nested type declaration. 2671 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2672 << (int)Record->isUnion(); 2673 Invalid = true; 2674 } 2675 } 2676 } else if (isa<AccessSpecDecl>(*Mem)) { 2677 // Any access specifier is fine. 2678 } else { 2679 // We have something that isn't a non-static data 2680 // member. Complain about it. 2681 unsigned DK = diag::err_anonymous_record_bad_member; 2682 if (isa<TypeDecl>(*Mem)) 2683 DK = diag::err_anonymous_record_with_type; 2684 else if (isa<FunctionDecl>(*Mem)) 2685 DK = diag::err_anonymous_record_with_function; 2686 else if (isa<VarDecl>(*Mem)) 2687 DK = diag::err_anonymous_record_with_static; 2688 2689 // Visual C++ allows type definition in anonymous struct or union. 2690 if (getLangOptions().MicrosoftExt && 2691 DK == diag::err_anonymous_record_with_type) 2692 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2693 << (int)Record->isUnion(); 2694 else { 2695 Diag((*Mem)->getLocation(), DK) 2696 << (int)Record->isUnion(); 2697 Invalid = true; 2698 } 2699 } 2700 } 2701 } 2702 2703 if (!Record->isUnion() && !Owner->isRecord()) { 2704 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2705 << (int)getLangOptions().CPlusPlus; 2706 Invalid = true; 2707 } 2708 2709 // Mock up a declarator. 2710 Declarator Dc(DS, Declarator::MemberContext); 2711 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2712 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2713 2714 // Create a declaration for this anonymous struct/union. 2715 NamedDecl *Anon = 0; 2716 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2717 Anon = FieldDecl::Create(Context, OwningClass, 2718 DS.getSourceRange().getBegin(), 2719 Record->getLocation(), 2720 /*IdentifierInfo=*/0, 2721 Context.getTypeDeclType(Record), 2722 TInfo, 2723 /*BitWidth=*/0, /*Mutable=*/false, 2724 /*HasInit=*/false); 2725 Anon->setAccess(AS); 2726 if (getLangOptions().CPlusPlus) 2727 FieldCollector->Add(cast<FieldDecl>(Anon)); 2728 } else { 2729 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2730 assert(SCSpec != DeclSpec::SCS_typedef && 2731 "Parser allowed 'typedef' as storage class VarDecl."); 2732 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2733 if (SCSpec == DeclSpec::SCS_mutable) { 2734 // mutable can only appear on non-static class members, so it's always 2735 // an error here 2736 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2737 Invalid = true; 2738 SC = SC_None; 2739 } 2740 SCSpec = DS.getStorageClassSpecAsWritten(); 2741 VarDecl::StorageClass SCAsWritten 2742 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2743 2744 Anon = VarDecl::Create(Context, Owner, 2745 DS.getSourceRange().getBegin(), 2746 Record->getLocation(), /*IdentifierInfo=*/0, 2747 Context.getTypeDeclType(Record), 2748 TInfo, SC, SCAsWritten); 2749 2750 // Default-initialize the implicit variable. This initialization will be 2751 // trivial in almost all cases, except if a union member has an in-class 2752 // initializer: 2753 // union { int n = 0; }; 2754 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2755 } 2756 Anon->setImplicit(); 2757 2758 // Add the anonymous struct/union object to the current 2759 // context. We'll be referencing this object when we refer to one of 2760 // its members. 2761 Owner->addDecl(Anon); 2762 2763 // Inject the members of the anonymous struct/union into the owning 2764 // context and into the identifier resolver chain for name lookup 2765 // purposes. 2766 SmallVector<NamedDecl*, 2> Chain; 2767 Chain.push_back(Anon); 2768 2769 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2770 Chain, false)) 2771 Invalid = true; 2772 2773 // Mark this as an anonymous struct/union type. Note that we do not 2774 // do this until after we have already checked and injected the 2775 // members of this anonymous struct/union type, because otherwise 2776 // the members could be injected twice: once by DeclContext when it 2777 // builds its lookup table, and once by 2778 // InjectAnonymousStructOrUnionMembers. 2779 Record->setAnonymousStructOrUnion(true); 2780 2781 if (Invalid) 2782 Anon->setInvalidDecl(); 2783 2784 return Anon; 2785} 2786 2787/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2788/// Microsoft C anonymous structure. 2789/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2790/// Example: 2791/// 2792/// struct A { int a; }; 2793/// struct B { struct A; int b; }; 2794/// 2795/// void foo() { 2796/// B var; 2797/// var.a = 3; 2798/// } 2799/// 2800Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2801 RecordDecl *Record) { 2802 2803 // If there is no Record, get the record via the typedef. 2804 if (!Record) 2805 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2806 2807 // Mock up a declarator. 2808 Declarator Dc(DS, Declarator::TypeNameContext); 2809 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2810 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2811 2812 // Create a declaration for this anonymous struct. 2813 NamedDecl* Anon = FieldDecl::Create(Context, 2814 cast<RecordDecl>(CurContext), 2815 DS.getSourceRange().getBegin(), 2816 DS.getSourceRange().getBegin(), 2817 /*IdentifierInfo=*/0, 2818 Context.getTypeDeclType(Record), 2819 TInfo, 2820 /*BitWidth=*/0, /*Mutable=*/false, 2821 /*HasInit=*/false); 2822 Anon->setImplicit(); 2823 2824 // Add the anonymous struct object to the current context. 2825 CurContext->addDecl(Anon); 2826 2827 // Inject the members of the anonymous struct into the current 2828 // context and into the identifier resolver chain for name lookup 2829 // purposes. 2830 SmallVector<NamedDecl*, 2> Chain; 2831 Chain.push_back(Anon); 2832 2833 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2834 Record->getDefinition(), 2835 AS_none, Chain, true)) 2836 Anon->setInvalidDecl(); 2837 2838 return Anon; 2839} 2840 2841/// GetNameForDeclarator - Determine the full declaration name for the 2842/// given Declarator. 2843DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2844 return GetNameFromUnqualifiedId(D.getName()); 2845} 2846 2847/// \brief Retrieves the declaration name from a parsed unqualified-id. 2848DeclarationNameInfo 2849Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2850 DeclarationNameInfo NameInfo; 2851 NameInfo.setLoc(Name.StartLocation); 2852 2853 switch (Name.getKind()) { 2854 2855 case UnqualifiedId::IK_ImplicitSelfParam: 2856 case UnqualifiedId::IK_Identifier: 2857 NameInfo.setName(Name.Identifier); 2858 NameInfo.setLoc(Name.StartLocation); 2859 return NameInfo; 2860 2861 case UnqualifiedId::IK_OperatorFunctionId: 2862 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2863 Name.OperatorFunctionId.Operator)); 2864 NameInfo.setLoc(Name.StartLocation); 2865 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2866 = Name.OperatorFunctionId.SymbolLocations[0]; 2867 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2868 = Name.EndLocation.getRawEncoding(); 2869 return NameInfo; 2870 2871 case UnqualifiedId::IK_LiteralOperatorId: 2872 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2873 Name.Identifier)); 2874 NameInfo.setLoc(Name.StartLocation); 2875 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2876 return NameInfo; 2877 2878 case UnqualifiedId::IK_ConversionFunctionId: { 2879 TypeSourceInfo *TInfo; 2880 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2881 if (Ty.isNull()) 2882 return DeclarationNameInfo(); 2883 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2884 Context.getCanonicalType(Ty))); 2885 NameInfo.setLoc(Name.StartLocation); 2886 NameInfo.setNamedTypeInfo(TInfo); 2887 return NameInfo; 2888 } 2889 2890 case UnqualifiedId::IK_ConstructorName: { 2891 TypeSourceInfo *TInfo; 2892 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2893 if (Ty.isNull()) 2894 return DeclarationNameInfo(); 2895 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2896 Context.getCanonicalType(Ty))); 2897 NameInfo.setLoc(Name.StartLocation); 2898 NameInfo.setNamedTypeInfo(TInfo); 2899 return NameInfo; 2900 } 2901 2902 case UnqualifiedId::IK_ConstructorTemplateId: { 2903 // In well-formed code, we can only have a constructor 2904 // template-id that refers to the current context, so go there 2905 // to find the actual type being constructed. 2906 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2907 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2908 return DeclarationNameInfo(); 2909 2910 // Determine the type of the class being constructed. 2911 QualType CurClassType = Context.getTypeDeclType(CurClass); 2912 2913 // FIXME: Check two things: that the template-id names the same type as 2914 // CurClassType, and that the template-id does not occur when the name 2915 // was qualified. 2916 2917 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2918 Context.getCanonicalType(CurClassType))); 2919 NameInfo.setLoc(Name.StartLocation); 2920 // FIXME: should we retrieve TypeSourceInfo? 2921 NameInfo.setNamedTypeInfo(0); 2922 return NameInfo; 2923 } 2924 2925 case UnqualifiedId::IK_DestructorName: { 2926 TypeSourceInfo *TInfo; 2927 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2928 if (Ty.isNull()) 2929 return DeclarationNameInfo(); 2930 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2931 Context.getCanonicalType(Ty))); 2932 NameInfo.setLoc(Name.StartLocation); 2933 NameInfo.setNamedTypeInfo(TInfo); 2934 return NameInfo; 2935 } 2936 2937 case UnqualifiedId::IK_TemplateId: { 2938 TemplateName TName = Name.TemplateId->Template.get(); 2939 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2940 return Context.getNameForTemplate(TName, TNameLoc); 2941 } 2942 2943 } // switch (Name.getKind()) 2944 2945 llvm_unreachable("Unknown name kind"); 2946} 2947 2948static QualType getCoreType(QualType Ty) { 2949 do { 2950 if (Ty->isPointerType() || Ty->isReferenceType()) 2951 Ty = Ty->getPointeeType(); 2952 else if (Ty->isArrayType()) 2953 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 2954 else 2955 return Ty.withoutLocalFastQualifiers(); 2956 } while (true); 2957} 2958 2959/// isNearlyMatchingFunction - Determine whether the C++ functions 2960/// Declaration and Definition are "nearly" matching. This heuristic 2961/// is used to improve diagnostics in the case where an out-of-line 2962/// function definition doesn't match any declaration within the class 2963/// or namespace. Also sets Params to the list of indices to the 2964/// parameters that differ between the declaration and the definition. 2965static bool isNearlyMatchingFunction(ASTContext &Context, 2966 FunctionDecl *Declaration, 2967 FunctionDecl *Definition, 2968 llvm::SmallVectorImpl<unsigned> &Params) { 2969 Params.clear(); 2970 if (Declaration->param_size() != Definition->param_size()) 2971 return false; 2972 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2973 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2974 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2975 2976 // The parameter types are identical 2977 if (Context.hasSameType(DefParamTy, DeclParamTy)) 2978 continue; 2979 2980 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 2981 QualType DefParamBaseTy = getCoreType(DefParamTy); 2982 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 2983 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 2984 2985 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 2986 (DeclTyName && DeclTyName == DefTyName)) 2987 Params.push_back(Idx); 2988 else // The two parameters aren't even close 2989 return false; 2990 } 2991 2992 return true; 2993} 2994 2995/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2996/// declarator needs to be rebuilt in the current instantiation. 2997/// Any bits of declarator which appear before the name are valid for 2998/// consideration here. That's specifically the type in the decl spec 2999/// and the base type in any member-pointer chunks. 3000static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3001 DeclarationName Name) { 3002 // The types we specifically need to rebuild are: 3003 // - typenames, typeofs, and decltypes 3004 // - types which will become injected class names 3005 // Of course, we also need to rebuild any type referencing such a 3006 // type. It's safest to just say "dependent", but we call out a 3007 // few cases here. 3008 3009 DeclSpec &DS = D.getMutableDeclSpec(); 3010 switch (DS.getTypeSpecType()) { 3011 case DeclSpec::TST_typename: 3012 case DeclSpec::TST_typeofType: 3013 case DeclSpec::TST_decltype: 3014 case DeclSpec::TST_underlyingType: { 3015 // Grab the type from the parser. 3016 TypeSourceInfo *TSI = 0; 3017 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3018 if (T.isNull() || !T->isDependentType()) break; 3019 3020 // Make sure there's a type source info. This isn't really much 3021 // of a waste; most dependent types should have type source info 3022 // attached already. 3023 if (!TSI) 3024 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3025 3026 // Rebuild the type in the current instantiation. 3027 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3028 if (!TSI) return true; 3029 3030 // Store the new type back in the decl spec. 3031 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3032 DS.UpdateTypeRep(LocType); 3033 break; 3034 } 3035 3036 case DeclSpec::TST_typeofExpr: { 3037 Expr *E = DS.getRepAsExpr(); 3038 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3039 if (Result.isInvalid()) return true; 3040 DS.UpdateExprRep(Result.get()); 3041 break; 3042 } 3043 3044 default: 3045 // Nothing to do for these decl specs. 3046 break; 3047 } 3048 3049 // It doesn't matter what order we do this in. 3050 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3051 DeclaratorChunk &Chunk = D.getTypeObject(I); 3052 3053 // The only type information in the declarator which can come 3054 // before the declaration name is the base type of a member 3055 // pointer. 3056 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3057 continue; 3058 3059 // Rebuild the scope specifier in-place. 3060 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3061 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3062 return true; 3063 } 3064 3065 return false; 3066} 3067 3068Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3069 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 3070 /*IsFunctionDefinition=*/false); 3071} 3072 3073/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3074/// If T is the name of a class, then each of the following shall have a 3075/// name different from T: 3076/// - every static data member of class T; 3077/// - every member function of class T 3078/// - every member of class T that is itself a type; 3079/// \returns true if the declaration name violates these rules. 3080bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3081 DeclarationNameInfo NameInfo) { 3082 DeclarationName Name = NameInfo.getName(); 3083 3084 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3085 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3086 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3087 return true; 3088 } 3089 3090 return false; 3091} 3092 3093Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3094 MultiTemplateParamsArg TemplateParamLists, 3095 bool IsFunctionDefinition) { 3096 // TODO: consider using NameInfo for diagnostic. 3097 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3098 DeclarationName Name = NameInfo.getName(); 3099 3100 // All of these full declarators require an identifier. If it doesn't have 3101 // one, the ParsedFreeStandingDeclSpec action should be used. 3102 if (!Name) { 3103 if (!D.isInvalidType()) // Reject this if we think it is valid. 3104 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3105 diag::err_declarator_need_ident) 3106 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3107 return 0; 3108 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3109 return 0; 3110 3111 // The scope passed in may not be a decl scope. Zip up the scope tree until 3112 // we find one that is. 3113 while ((S->getFlags() & Scope::DeclScope) == 0 || 3114 (S->getFlags() & Scope::TemplateParamScope) != 0) 3115 S = S->getParent(); 3116 3117 DeclContext *DC = CurContext; 3118 if (D.getCXXScopeSpec().isInvalid()) 3119 D.setInvalidType(); 3120 else if (D.getCXXScopeSpec().isSet()) { 3121 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3122 UPPC_DeclarationQualifier)) 3123 return 0; 3124 3125 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3126 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3127 if (!DC) { 3128 // If we could not compute the declaration context, it's because the 3129 // declaration context is dependent but does not refer to a class, 3130 // class template, or class template partial specialization. Complain 3131 // and return early, to avoid the coming semantic disaster. 3132 Diag(D.getIdentifierLoc(), 3133 diag::err_template_qualified_declarator_no_match) 3134 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3135 << D.getCXXScopeSpec().getRange(); 3136 return 0; 3137 } 3138 bool IsDependentContext = DC->isDependentContext(); 3139 3140 if (!IsDependentContext && 3141 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3142 return 0; 3143 3144 if (isa<CXXRecordDecl>(DC)) { 3145 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3146 Diag(D.getIdentifierLoc(), 3147 diag::err_member_def_undefined_record) 3148 << Name << DC << D.getCXXScopeSpec().getRange(); 3149 D.setInvalidType(); 3150 } else if (isa<CXXRecordDecl>(CurContext) && 3151 !D.getDeclSpec().isFriendSpecified()) { 3152 // The user provided a superfluous scope specifier inside a class 3153 // definition: 3154 // 3155 // class X { 3156 // void X::f(); 3157 // }; 3158 if (CurContext->Equals(DC)) 3159 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3160 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3161 else 3162 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3163 << Name << D.getCXXScopeSpec().getRange(); 3164 3165 // Pretend that this qualifier was not here. 3166 D.getCXXScopeSpec().clear(); 3167 } 3168 } 3169 3170 // Check whether we need to rebuild the type of the given 3171 // declaration in the current instantiation. 3172 if (EnteringContext && IsDependentContext && 3173 TemplateParamLists.size() != 0) { 3174 ContextRAII SavedContext(*this, DC); 3175 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3176 D.setInvalidType(); 3177 } 3178 } 3179 3180 if (DiagnoseClassNameShadow(DC, NameInfo)) 3181 // If this is a typedef, we'll end up spewing multiple diagnostics. 3182 // Just return early; it's safer. 3183 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3184 return 0; 3185 3186 NamedDecl *New; 3187 3188 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3189 QualType R = TInfo->getType(); 3190 3191 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3192 UPPC_DeclarationType)) 3193 D.setInvalidType(); 3194 3195 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3196 ForRedeclaration); 3197 3198 // See if this is a redefinition of a variable in the same scope. 3199 if (!D.getCXXScopeSpec().isSet()) { 3200 bool IsLinkageLookup = false; 3201 3202 // If the declaration we're planning to build will be a function 3203 // or object with linkage, then look for another declaration with 3204 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3205 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3206 /* Do nothing*/; 3207 else if (R->isFunctionType()) { 3208 if (CurContext->isFunctionOrMethod() || 3209 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3210 IsLinkageLookup = true; 3211 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3212 IsLinkageLookup = true; 3213 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3214 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3215 IsLinkageLookup = true; 3216 3217 if (IsLinkageLookup) 3218 Previous.clear(LookupRedeclarationWithLinkage); 3219 3220 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3221 } else { // Something like "int foo::x;" 3222 LookupQualifiedName(Previous, DC); 3223 3224 // Don't consider using declarations as previous declarations for 3225 // out-of-line members. 3226 RemoveUsingDecls(Previous); 3227 3228 // C++ 7.3.1.2p2: 3229 // Members (including explicit specializations of templates) of a named 3230 // namespace can also be defined outside that namespace by explicit 3231 // qualification of the name being defined, provided that the entity being 3232 // defined was already declared in the namespace and the definition appears 3233 // after the point of declaration in a namespace that encloses the 3234 // declarations namespace. 3235 // 3236 // Note that we only check the context at this point. We don't yet 3237 // have enough information to make sure that PrevDecl is actually 3238 // the declaration we want to match. For example, given: 3239 // 3240 // class X { 3241 // void f(); 3242 // void f(float); 3243 // }; 3244 // 3245 // void X::f(int) { } // ill-formed 3246 // 3247 // In this case, PrevDecl will point to the overload set 3248 // containing the two f's declared in X, but neither of them 3249 // matches. 3250 3251 // First check whether we named the global scope. 3252 if (isa<TranslationUnitDecl>(DC)) { 3253 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3254 << Name << D.getCXXScopeSpec().getRange(); 3255 } else { 3256 DeclContext *Cur = CurContext; 3257 while (isa<LinkageSpecDecl>(Cur)) 3258 Cur = Cur->getParent(); 3259 if (!Cur->Encloses(DC)) { 3260 // The qualifying scope doesn't enclose the original declaration. 3261 // Emit diagnostic based on current scope. 3262 SourceLocation L = D.getIdentifierLoc(); 3263 SourceRange R = D.getCXXScopeSpec().getRange(); 3264 if (isa<FunctionDecl>(Cur)) 3265 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3266 else 3267 Diag(L, diag::err_invalid_declarator_scope) 3268 << Name << cast<NamedDecl>(DC) << R; 3269 D.setInvalidType(); 3270 } 3271 } 3272 } 3273 3274 if (Previous.isSingleResult() && 3275 Previous.getFoundDecl()->isTemplateParameter()) { 3276 // Maybe we will complain about the shadowed template parameter. 3277 if (!D.isInvalidType()) 3278 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3279 Previous.getFoundDecl())) 3280 D.setInvalidType(); 3281 3282 // Just pretend that we didn't see the previous declaration. 3283 Previous.clear(); 3284 } 3285 3286 // In C++, the previous declaration we find might be a tag type 3287 // (class or enum). In this case, the new declaration will hide the 3288 // tag type. Note that this does does not apply if we're declaring a 3289 // typedef (C++ [dcl.typedef]p4). 3290 if (Previous.isSingleTagDecl() && 3291 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3292 Previous.clear(); 3293 3294 bool Redeclaration = false; 3295 bool AddToScope = true; 3296 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3297 if (TemplateParamLists.size()) { 3298 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3299 return 0; 3300 } 3301 3302 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3303 } else if (R->isFunctionType()) { 3304 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3305 move(TemplateParamLists), 3306 IsFunctionDefinition, Redeclaration, 3307 AddToScope); 3308 } else { 3309 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3310 move(TemplateParamLists), 3311 Redeclaration); 3312 } 3313 3314 if (New == 0) 3315 return 0; 3316 3317 // If this has an identifier and is not an invalid redeclaration or 3318 // function template specialization, add it to the scope stack. 3319 if (New->getDeclName() && AddToScope && 3320 !(Redeclaration && New->isInvalidDecl())) 3321 PushOnScopeChains(New, S); 3322 3323 return New; 3324} 3325 3326/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3327/// types into constant array types in certain situations which would otherwise 3328/// be errors (for GCC compatibility). 3329static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3330 ASTContext &Context, 3331 bool &SizeIsNegative, 3332 llvm::APSInt &Oversized) { 3333 // This method tries to turn a variable array into a constant 3334 // array even when the size isn't an ICE. This is necessary 3335 // for compatibility with code that depends on gcc's buggy 3336 // constant expression folding, like struct {char x[(int)(char*)2];} 3337 SizeIsNegative = false; 3338 Oversized = 0; 3339 3340 if (T->isDependentType()) 3341 return QualType(); 3342 3343 QualifierCollector Qs; 3344 const Type *Ty = Qs.strip(T); 3345 3346 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3347 QualType Pointee = PTy->getPointeeType(); 3348 QualType FixedType = 3349 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3350 Oversized); 3351 if (FixedType.isNull()) return FixedType; 3352 FixedType = Context.getPointerType(FixedType); 3353 return Qs.apply(Context, FixedType); 3354 } 3355 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3356 QualType Inner = PTy->getInnerType(); 3357 QualType FixedType = 3358 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3359 Oversized); 3360 if (FixedType.isNull()) return FixedType; 3361 FixedType = Context.getParenType(FixedType); 3362 return Qs.apply(Context, FixedType); 3363 } 3364 3365 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3366 if (!VLATy) 3367 return QualType(); 3368 // FIXME: We should probably handle this case 3369 if (VLATy->getElementType()->isVariablyModifiedType()) 3370 return QualType(); 3371 3372 Expr::EvalResult EvalResult; 3373 if (!VLATy->getSizeExpr() || 3374 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3375 !EvalResult.Val.isInt()) 3376 return QualType(); 3377 3378 // Check whether the array size is negative. 3379 llvm::APSInt &Res = EvalResult.Val.getInt(); 3380 if (Res.isSigned() && Res.isNegative()) { 3381 SizeIsNegative = true; 3382 return QualType(); 3383 } 3384 3385 // Check whether the array is too large to be addressed. 3386 unsigned ActiveSizeBits 3387 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3388 Res); 3389 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3390 Oversized = Res; 3391 return QualType(); 3392 } 3393 3394 return Context.getConstantArrayType(VLATy->getElementType(), 3395 Res, ArrayType::Normal, 0); 3396} 3397 3398/// \brief Register the given locally-scoped external C declaration so 3399/// that it can be found later for redeclarations 3400void 3401Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3402 const LookupResult &Previous, 3403 Scope *S) { 3404 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3405 "Decl is not a locally-scoped decl!"); 3406 // Note that we have a locally-scoped external with this name. 3407 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3408 3409 if (!Previous.isSingleResult()) 3410 return; 3411 3412 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3413 3414 // If there was a previous declaration of this variable, it may be 3415 // in our identifier chain. Update the identifier chain with the new 3416 // declaration. 3417 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3418 // The previous declaration was found on the identifer resolver 3419 // chain, so remove it from its scope. 3420 3421 if (S->isDeclScope(PrevDecl)) { 3422 // Special case for redeclarations in the SAME scope. 3423 // Because this declaration is going to be added to the identifier chain 3424 // later, we should temporarily take it OFF the chain. 3425 IdResolver.RemoveDecl(ND); 3426 3427 } else { 3428 // Find the scope for the original declaration. 3429 while (S && !S->isDeclScope(PrevDecl)) 3430 S = S->getParent(); 3431 } 3432 3433 if (S) 3434 S->RemoveDecl(PrevDecl); 3435 } 3436} 3437 3438llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3439Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3440 if (ExternalSource) { 3441 // Load locally-scoped external decls from the external source. 3442 SmallVector<NamedDecl *, 4> Decls; 3443 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3444 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3445 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3446 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3447 if (Pos == LocallyScopedExternalDecls.end()) 3448 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3449 } 3450 } 3451 3452 return LocallyScopedExternalDecls.find(Name); 3453} 3454 3455/// \brief Diagnose function specifiers on a declaration of an identifier that 3456/// does not identify a function. 3457void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3458 // FIXME: We should probably indicate the identifier in question to avoid 3459 // confusion for constructs like "inline int a(), b;" 3460 if (D.getDeclSpec().isInlineSpecified()) 3461 Diag(D.getDeclSpec().getInlineSpecLoc(), 3462 diag::err_inline_non_function); 3463 3464 if (D.getDeclSpec().isVirtualSpecified()) 3465 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3466 diag::err_virtual_non_function); 3467 3468 if (D.getDeclSpec().isExplicitSpecified()) 3469 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3470 diag::err_explicit_non_function); 3471} 3472 3473NamedDecl* 3474Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3475 QualType R, TypeSourceInfo *TInfo, 3476 LookupResult &Previous, bool &Redeclaration) { 3477 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3478 if (D.getCXXScopeSpec().isSet()) { 3479 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3480 << D.getCXXScopeSpec().getRange(); 3481 D.setInvalidType(); 3482 // Pretend we didn't see the scope specifier. 3483 DC = CurContext; 3484 Previous.clear(); 3485 } 3486 3487 if (getLangOptions().CPlusPlus) { 3488 // Check that there are no default arguments (C++ only). 3489 CheckExtraCXXDefaultArguments(D); 3490 } 3491 3492 DiagnoseFunctionSpecifiers(D); 3493 3494 if (D.getDeclSpec().isThreadSpecified()) 3495 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3496 if (D.getDeclSpec().isConstexprSpecified()) 3497 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3498 << 1; 3499 3500 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3501 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3502 << D.getName().getSourceRange(); 3503 return 0; 3504 } 3505 3506 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3507 if (!NewTD) return 0; 3508 3509 // Handle attributes prior to checking for duplicates in MergeVarDecl 3510 ProcessDeclAttributes(S, NewTD, D); 3511 3512 CheckTypedefForVariablyModifiedType(S, NewTD); 3513 3514 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3515} 3516 3517void 3518Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3519 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3520 // then it shall have block scope. 3521 // Note that variably modified types must be fixed before merging the decl so 3522 // that redeclarations will match. 3523 QualType T = NewTD->getUnderlyingType(); 3524 if (T->isVariablyModifiedType()) { 3525 getCurFunction()->setHasBranchProtectedScope(); 3526 3527 if (S->getFnParent() == 0) { 3528 bool SizeIsNegative; 3529 llvm::APSInt Oversized; 3530 QualType FixedTy = 3531 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3532 Oversized); 3533 if (!FixedTy.isNull()) { 3534 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3535 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3536 } else { 3537 if (SizeIsNegative) 3538 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3539 else if (T->isVariableArrayType()) 3540 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3541 else if (Oversized.getBoolValue()) 3542 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3543 else 3544 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3545 NewTD->setInvalidDecl(); 3546 } 3547 } 3548 } 3549} 3550 3551 3552/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3553/// declares a typedef-name, either using the 'typedef' type specifier or via 3554/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3555NamedDecl* 3556Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3557 LookupResult &Previous, bool &Redeclaration) { 3558 // Merge the decl with the existing one if appropriate. If the decl is 3559 // in an outer scope, it isn't the same thing. 3560 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3561 /*ExplicitInstantiationOrSpecialization=*/false); 3562 if (!Previous.empty()) { 3563 Redeclaration = true; 3564 MergeTypedefNameDecl(NewTD, Previous); 3565 } 3566 3567 // If this is the C FILE type, notify the AST context. 3568 if (IdentifierInfo *II = NewTD->getIdentifier()) 3569 if (!NewTD->isInvalidDecl() && 3570 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3571 if (II->isStr("FILE")) 3572 Context.setFILEDecl(NewTD); 3573 else if (II->isStr("jmp_buf")) 3574 Context.setjmp_bufDecl(NewTD); 3575 else if (II->isStr("sigjmp_buf")) 3576 Context.setsigjmp_bufDecl(NewTD); 3577 else if (II->isStr("__builtin_va_list")) 3578 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3579 } 3580 3581 return NewTD; 3582} 3583 3584/// \brief Determines whether the given declaration is an out-of-scope 3585/// previous declaration. 3586/// 3587/// This routine should be invoked when name lookup has found a 3588/// previous declaration (PrevDecl) that is not in the scope where a 3589/// new declaration by the same name is being introduced. If the new 3590/// declaration occurs in a local scope, previous declarations with 3591/// linkage may still be considered previous declarations (C99 3592/// 6.2.2p4-5, C++ [basic.link]p6). 3593/// 3594/// \param PrevDecl the previous declaration found by name 3595/// lookup 3596/// 3597/// \param DC the context in which the new declaration is being 3598/// declared. 3599/// 3600/// \returns true if PrevDecl is an out-of-scope previous declaration 3601/// for a new delcaration with the same name. 3602static bool 3603isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3604 ASTContext &Context) { 3605 if (!PrevDecl) 3606 return false; 3607 3608 if (!PrevDecl->hasLinkage()) 3609 return false; 3610 3611 if (Context.getLangOptions().CPlusPlus) { 3612 // C++ [basic.link]p6: 3613 // If there is a visible declaration of an entity with linkage 3614 // having the same name and type, ignoring entities declared 3615 // outside the innermost enclosing namespace scope, the block 3616 // scope declaration declares that same entity and receives the 3617 // linkage of the previous declaration. 3618 DeclContext *OuterContext = DC->getRedeclContext(); 3619 if (!OuterContext->isFunctionOrMethod()) 3620 // This rule only applies to block-scope declarations. 3621 return false; 3622 3623 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3624 if (PrevOuterContext->isRecord()) 3625 // We found a member function: ignore it. 3626 return false; 3627 3628 // Find the innermost enclosing namespace for the new and 3629 // previous declarations. 3630 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3631 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3632 3633 // The previous declaration is in a different namespace, so it 3634 // isn't the same function. 3635 if (!OuterContext->Equals(PrevOuterContext)) 3636 return false; 3637 } 3638 3639 return true; 3640} 3641 3642static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3643 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3644 if (!SS.isSet()) return; 3645 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3646} 3647 3648bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3649 QualType type = decl->getType(); 3650 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3651 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3652 // Various kinds of declaration aren't allowed to be __autoreleasing. 3653 unsigned kind = -1U; 3654 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3655 if (var->hasAttr<BlocksAttr>()) 3656 kind = 0; // __block 3657 else if (!var->hasLocalStorage()) 3658 kind = 1; // global 3659 } else if (isa<ObjCIvarDecl>(decl)) { 3660 kind = 3; // ivar 3661 } else if (isa<FieldDecl>(decl)) { 3662 kind = 2; // field 3663 } 3664 3665 if (kind != -1U) { 3666 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3667 << kind; 3668 } 3669 } else if (lifetime == Qualifiers::OCL_None) { 3670 // Try to infer lifetime. 3671 if (!type->isObjCLifetimeType()) 3672 return false; 3673 3674 lifetime = type->getObjCARCImplicitLifetime(); 3675 type = Context.getLifetimeQualifiedType(type, lifetime); 3676 decl->setType(type); 3677 } 3678 3679 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3680 // Thread-local variables cannot have lifetime. 3681 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3682 var->isThreadSpecified()) { 3683 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3684 << var->getType(); 3685 return true; 3686 } 3687 } 3688 3689 return false; 3690} 3691 3692NamedDecl* 3693Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3694 QualType R, TypeSourceInfo *TInfo, 3695 LookupResult &Previous, 3696 MultiTemplateParamsArg TemplateParamLists, 3697 bool &Redeclaration) { 3698 DeclarationName Name = GetNameForDeclarator(D).getName(); 3699 3700 // Check that there are no default arguments (C++ only). 3701 if (getLangOptions().CPlusPlus) 3702 CheckExtraCXXDefaultArguments(D); 3703 3704 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3705 assert(SCSpec != DeclSpec::SCS_typedef && 3706 "Parser allowed 'typedef' as storage class VarDecl."); 3707 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3708 if (SCSpec == DeclSpec::SCS_mutable) { 3709 // mutable can only appear on non-static class members, so it's always 3710 // an error here 3711 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3712 D.setInvalidType(); 3713 SC = SC_None; 3714 } 3715 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3716 VarDecl::StorageClass SCAsWritten 3717 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3718 3719 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3720 if (!II) { 3721 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3722 << Name.getAsString(); 3723 return 0; 3724 } 3725 3726 DiagnoseFunctionSpecifiers(D); 3727 3728 if (!DC->isRecord() && S->getFnParent() == 0) { 3729 // C99 6.9p2: The storage-class specifiers auto and register shall not 3730 // appear in the declaration specifiers in an external declaration. 3731 if (SC == SC_Auto || SC == SC_Register) { 3732 3733 // If this is a register variable with an asm label specified, then this 3734 // is a GNU extension. 3735 if (SC == SC_Register && D.getAsmLabel()) 3736 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3737 else 3738 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3739 D.setInvalidType(); 3740 } 3741 } 3742 3743 if (getLangOptions().OpenCL) { 3744 // Set up the special work-group-local storage class for variables in the 3745 // OpenCL __local address space. 3746 if (R.getAddressSpace() == LangAS::opencl_local) 3747 SC = SC_OpenCLWorkGroupLocal; 3748 } 3749 3750 bool isExplicitSpecialization = false; 3751 VarDecl *NewVD; 3752 if (!getLangOptions().CPlusPlus) { 3753 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3754 D.getIdentifierLoc(), II, 3755 R, TInfo, SC, SCAsWritten); 3756 3757 if (D.isInvalidType()) 3758 NewVD->setInvalidDecl(); 3759 } else { 3760 if (DC->isRecord() && !CurContext->isRecord()) { 3761 // This is an out-of-line definition of a static data member. 3762 if (SC == SC_Static) { 3763 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3764 diag::err_static_out_of_line) 3765 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3766 } else if (SC == SC_None) 3767 SC = SC_Static; 3768 } 3769 if (SC == SC_Static) { 3770 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3771 if (RD->isLocalClass()) 3772 Diag(D.getIdentifierLoc(), 3773 diag::err_static_data_member_not_allowed_in_local_class) 3774 << Name << RD->getDeclName(); 3775 3776 // C++ [class.union]p1: If a union contains a static data member, 3777 // the program is ill-formed. 3778 // 3779 // We also disallow static data members in anonymous structs. 3780 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3781 Diag(D.getIdentifierLoc(), 3782 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3783 << Name << RD->isUnion(); 3784 } 3785 } 3786 3787 // Match up the template parameter lists with the scope specifier, then 3788 // determine whether we have a template or a template specialization. 3789 isExplicitSpecialization = false; 3790 bool Invalid = false; 3791 if (TemplateParameterList *TemplateParams 3792 = MatchTemplateParametersToScopeSpecifier( 3793 D.getDeclSpec().getSourceRange().getBegin(), 3794 D.getIdentifierLoc(), 3795 D.getCXXScopeSpec(), 3796 TemplateParamLists.get(), 3797 TemplateParamLists.size(), 3798 /*never a friend*/ false, 3799 isExplicitSpecialization, 3800 Invalid)) { 3801 if (TemplateParams->size() > 0) { 3802 // There is no such thing as a variable template. 3803 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3804 << II 3805 << SourceRange(TemplateParams->getTemplateLoc(), 3806 TemplateParams->getRAngleLoc()); 3807 return 0; 3808 } else { 3809 // There is an extraneous 'template<>' for this variable. Complain 3810 // about it, but allow the declaration of the variable. 3811 Diag(TemplateParams->getTemplateLoc(), 3812 diag::err_template_variable_noparams) 3813 << II 3814 << SourceRange(TemplateParams->getTemplateLoc(), 3815 TemplateParams->getRAngleLoc()); 3816 } 3817 } 3818 3819 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3820 D.getIdentifierLoc(), II, 3821 R, TInfo, SC, SCAsWritten); 3822 3823 // If this decl has an auto type in need of deduction, make a note of the 3824 // Decl so we can diagnose uses of it in its own initializer. 3825 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3826 R->getContainedAutoType()) 3827 ParsingInitForAutoVars.insert(NewVD); 3828 3829 if (D.isInvalidType() || Invalid) 3830 NewVD->setInvalidDecl(); 3831 3832 SetNestedNameSpecifier(NewVD, D); 3833 3834 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3835 NewVD->setTemplateParameterListsInfo(Context, 3836 TemplateParamLists.size(), 3837 TemplateParamLists.release()); 3838 } 3839 3840 if (D.getDeclSpec().isConstexprSpecified()) { 3841 // FIXME: once we know whether there's an initializer, apply this to 3842 // static data members too. 3843 if (!NewVD->isStaticDataMember() && 3844 !NewVD->isThisDeclarationADefinition()) { 3845 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3846 // of a variable. Suggest replacing it with 'const' if appropriate. 3847 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3848 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3849 // If the declarator is complex, we need to move the keyword to the 3850 // innermost chunk as we switch it from 'constexpr' to 'const'. 3851 int Kind = DeclaratorChunk::Paren; 3852 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3853 Kind = D.getTypeObject(I).Kind; 3854 if (Kind != DeclaratorChunk::Paren) 3855 break; 3856 } 3857 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3858 Kind == DeclaratorChunk::Reference) 3859 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3860 << FixItHint::CreateRemoval(ConstexprRange); 3861 else if (Kind == DeclaratorChunk::Paren) 3862 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3863 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3864 else 3865 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3866 << FixItHint::CreateRemoval(ConstexprRange) 3867 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3868 } else { 3869 NewVD->setConstexpr(true); 3870 } 3871 } 3872 } 3873 3874 // Set the lexical context. If the declarator has a C++ scope specifier, the 3875 // lexical context will be different from the semantic context. 3876 NewVD->setLexicalDeclContext(CurContext); 3877 3878 if (D.getDeclSpec().isThreadSpecified()) { 3879 if (NewVD->hasLocalStorage()) 3880 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3881 else if (!Context.getTargetInfo().isTLSSupported()) 3882 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3883 else 3884 NewVD->setThreadSpecified(true); 3885 } 3886 3887 if (D.getDeclSpec().isModulePrivateSpecified()) { 3888 if (isExplicitSpecialization) 3889 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3890 << 2 3891 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3892 else if (NewVD->hasLocalStorage()) 3893 Diag(NewVD->getLocation(), diag::err_module_private_local) 3894 << 0 << NewVD->getDeclName() 3895 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3896 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3897 else 3898 NewVD->setModulePrivate(); 3899 } 3900 3901 // Handle attributes prior to checking for duplicates in MergeVarDecl 3902 ProcessDeclAttributes(S, NewVD, D); 3903 3904 // In auto-retain/release, infer strong retension for variables of 3905 // retainable type. 3906 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3907 NewVD->setInvalidDecl(); 3908 3909 // Handle GNU asm-label extension (encoded as an attribute). 3910 if (Expr *E = (Expr*)D.getAsmLabel()) { 3911 // The parser guarantees this is a string. 3912 StringLiteral *SE = cast<StringLiteral>(E); 3913 StringRef Label = SE->getString(); 3914 if (S->getFnParent() != 0) { 3915 switch (SC) { 3916 case SC_None: 3917 case SC_Auto: 3918 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3919 break; 3920 case SC_Register: 3921 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3922 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3923 break; 3924 case SC_Static: 3925 case SC_Extern: 3926 case SC_PrivateExtern: 3927 case SC_OpenCLWorkGroupLocal: 3928 break; 3929 } 3930 } 3931 3932 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3933 Context, Label)); 3934 } 3935 3936 // Diagnose shadowed variables before filtering for scope. 3937 if (!D.getCXXScopeSpec().isSet()) 3938 CheckShadow(S, NewVD, Previous); 3939 3940 // Don't consider existing declarations that are in a different 3941 // scope and are out-of-semantic-context declarations (if the new 3942 // declaration has linkage). 3943 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3944 isExplicitSpecialization); 3945 3946 if (!getLangOptions().CPlusPlus) 3947 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3948 else { 3949 // Merge the decl with the existing one if appropriate. 3950 if (!Previous.empty()) { 3951 if (Previous.isSingleResult() && 3952 isa<FieldDecl>(Previous.getFoundDecl()) && 3953 D.getCXXScopeSpec().isSet()) { 3954 // The user tried to define a non-static data member 3955 // out-of-line (C++ [dcl.meaning]p1). 3956 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3957 << D.getCXXScopeSpec().getRange(); 3958 Previous.clear(); 3959 NewVD->setInvalidDecl(); 3960 } 3961 } else if (D.getCXXScopeSpec().isSet()) { 3962 // No previous declaration in the qualifying scope. 3963 Diag(D.getIdentifierLoc(), diag::err_no_member) 3964 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3965 << D.getCXXScopeSpec().getRange(); 3966 NewVD->setInvalidDecl(); 3967 } 3968 3969 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3970 3971 // This is an explicit specialization of a static data member. Check it. 3972 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3973 CheckMemberSpecialization(NewVD, Previous)) 3974 NewVD->setInvalidDecl(); 3975 } 3976 3977 // attributes declared post-definition are currently ignored 3978 // FIXME: This should be handled in attribute merging, not 3979 // here. 3980 if (Previous.isSingleResult()) { 3981 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3982 if (Def && (Def = Def->getDefinition()) && 3983 Def != NewVD && D.hasAttributes()) { 3984 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3985 Diag(Def->getLocation(), diag::note_previous_definition); 3986 } 3987 } 3988 3989 // If this is a locally-scoped extern C variable, update the map of 3990 // such variables. 3991 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3992 !NewVD->isInvalidDecl()) 3993 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3994 3995 // If there's a #pragma GCC visibility in scope, and this isn't a class 3996 // member, set the visibility of this variable. 3997 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3998 AddPushedVisibilityAttribute(NewVD); 3999 4000 MarkUnusedFileScopedDecl(NewVD); 4001 4002 return NewVD; 4003} 4004 4005/// \brief Diagnose variable or built-in function shadowing. Implements 4006/// -Wshadow. 4007/// 4008/// This method is called whenever a VarDecl is added to a "useful" 4009/// scope. 4010/// 4011/// \param S the scope in which the shadowing name is being declared 4012/// \param R the lookup of the name 4013/// 4014void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4015 // Return if warning is ignored. 4016 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4017 DiagnosticsEngine::Ignored) 4018 return; 4019 4020 // Don't diagnose declarations at file scope. 4021 if (D->hasGlobalStorage()) 4022 return; 4023 4024 DeclContext *NewDC = D->getDeclContext(); 4025 4026 // Only diagnose if we're shadowing an unambiguous field or variable. 4027 if (R.getResultKind() != LookupResult::Found) 4028 return; 4029 4030 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4031 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4032 return; 4033 4034 // Fields are not shadowed by variables in C++ static methods. 4035 if (isa<FieldDecl>(ShadowedDecl)) 4036 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4037 if (MD->isStatic()) 4038 return; 4039 4040 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4041 if (shadowedVar->isExternC()) { 4042 // For shadowing external vars, make sure that we point to the global 4043 // declaration, not a locally scoped extern declaration. 4044 for (VarDecl::redecl_iterator 4045 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4046 I != E; ++I) 4047 if (I->isFileVarDecl()) { 4048 ShadowedDecl = *I; 4049 break; 4050 } 4051 } 4052 4053 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4054 4055 // Only warn about certain kinds of shadowing for class members. 4056 if (NewDC && NewDC->isRecord()) { 4057 // In particular, don't warn about shadowing non-class members. 4058 if (!OldDC->isRecord()) 4059 return; 4060 4061 // TODO: should we warn about static data members shadowing 4062 // static data members from base classes? 4063 4064 // TODO: don't diagnose for inaccessible shadowed members. 4065 // This is hard to do perfectly because we might friend the 4066 // shadowing context, but that's just a false negative. 4067 } 4068 4069 // Determine what kind of declaration we're shadowing. 4070 unsigned Kind; 4071 if (isa<RecordDecl>(OldDC)) { 4072 if (isa<FieldDecl>(ShadowedDecl)) 4073 Kind = 3; // field 4074 else 4075 Kind = 2; // static data member 4076 } else if (OldDC->isFileContext()) 4077 Kind = 1; // global 4078 else 4079 Kind = 0; // local 4080 4081 DeclarationName Name = R.getLookupName(); 4082 4083 // Emit warning and note. 4084 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4085 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4086} 4087 4088/// \brief Check -Wshadow without the advantage of a previous lookup. 4089void Sema::CheckShadow(Scope *S, VarDecl *D) { 4090 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4091 DiagnosticsEngine::Ignored) 4092 return; 4093 4094 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4095 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4096 LookupName(R, S); 4097 CheckShadow(S, D, R); 4098} 4099 4100/// \brief Perform semantic checking on a newly-created variable 4101/// declaration. 4102/// 4103/// This routine performs all of the type-checking required for a 4104/// variable declaration once it has been built. It is used both to 4105/// check variables after they have been parsed and their declarators 4106/// have been translated into a declaration, and to check variables 4107/// that have been instantiated from a template. 4108/// 4109/// Sets NewVD->isInvalidDecl() if an error was encountered. 4110void Sema::CheckVariableDeclaration(VarDecl *NewVD, 4111 LookupResult &Previous, 4112 bool &Redeclaration) { 4113 // If the decl is already known invalid, don't check it. 4114 if (NewVD->isInvalidDecl()) 4115 return; 4116 4117 QualType T = NewVD->getType(); 4118 4119 if (T->isObjCObjectType()) { 4120 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4121 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4122 T = Context.getObjCObjectPointerType(T); 4123 NewVD->setType(T); 4124 } 4125 4126 // Emit an error if an address space was applied to decl with local storage. 4127 // This includes arrays of objects with address space qualifiers, but not 4128 // automatic variables that point to other address spaces. 4129 // ISO/IEC TR 18037 S5.1.2 4130 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4131 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4132 return NewVD->setInvalidDecl(); 4133 } 4134 4135 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4136 && !NewVD->hasAttr<BlocksAttr>()) { 4137 if (getLangOptions().getGC() != LangOptions::NonGC) 4138 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4139 else 4140 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4141 } 4142 4143 bool isVM = T->isVariablyModifiedType(); 4144 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4145 NewVD->hasAttr<BlocksAttr>()) 4146 getCurFunction()->setHasBranchProtectedScope(); 4147 4148 if ((isVM && NewVD->hasLinkage()) || 4149 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4150 bool SizeIsNegative; 4151 llvm::APSInt Oversized; 4152 QualType FixedTy = 4153 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4154 Oversized); 4155 4156 if (FixedTy.isNull() && T->isVariableArrayType()) { 4157 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4158 // FIXME: This won't give the correct result for 4159 // int a[10][n]; 4160 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4161 4162 if (NewVD->isFileVarDecl()) 4163 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4164 << SizeRange; 4165 else if (NewVD->getStorageClass() == SC_Static) 4166 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4167 << SizeRange; 4168 else 4169 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4170 << SizeRange; 4171 return NewVD->setInvalidDecl(); 4172 } 4173 4174 if (FixedTy.isNull()) { 4175 if (NewVD->isFileVarDecl()) 4176 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4177 else 4178 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4179 return NewVD->setInvalidDecl(); 4180 } 4181 4182 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4183 NewVD->setType(FixedTy); 4184 } 4185 4186 if (Previous.empty() && NewVD->isExternC()) { 4187 // Since we did not find anything by this name and we're declaring 4188 // an extern "C" variable, look for a non-visible extern "C" 4189 // declaration with the same name. 4190 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4191 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4192 if (Pos != LocallyScopedExternalDecls.end()) 4193 Previous.addDecl(Pos->second); 4194 } 4195 4196 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4197 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4198 << T; 4199 return NewVD->setInvalidDecl(); 4200 } 4201 4202 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4203 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4204 return NewVD->setInvalidDecl(); 4205 } 4206 4207 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4208 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4209 return NewVD->setInvalidDecl(); 4210 } 4211 4212 // Function pointers and references cannot have qualified function type, only 4213 // function pointer-to-members can do that. 4214 QualType Pointee; 4215 unsigned PtrOrRef = 0; 4216 if (const PointerType *Ptr = T->getAs<PointerType>()) 4217 Pointee = Ptr->getPointeeType(); 4218 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4219 Pointee = Ref->getPointeeType(); 4220 PtrOrRef = 1; 4221 } 4222 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4223 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4224 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4225 << PtrOrRef; 4226 return NewVD->setInvalidDecl(); 4227 } 4228 4229 if (!Previous.empty()) { 4230 Redeclaration = true; 4231 MergeVarDecl(NewVD, Previous); 4232 } 4233} 4234 4235/// \brief Data used with FindOverriddenMethod 4236struct FindOverriddenMethodData { 4237 Sema *S; 4238 CXXMethodDecl *Method; 4239}; 4240 4241/// \brief Member lookup function that determines whether a given C++ 4242/// method overrides a method in a base class, to be used with 4243/// CXXRecordDecl::lookupInBases(). 4244static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4245 CXXBasePath &Path, 4246 void *UserData) { 4247 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4248 4249 FindOverriddenMethodData *Data 4250 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4251 4252 DeclarationName Name = Data->Method->getDeclName(); 4253 4254 // FIXME: Do we care about other names here too? 4255 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4256 // We really want to find the base class destructor here. 4257 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4258 CanQualType CT = Data->S->Context.getCanonicalType(T); 4259 4260 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4261 } 4262 4263 for (Path.Decls = BaseRecord->lookup(Name); 4264 Path.Decls.first != Path.Decls.second; 4265 ++Path.Decls.first) { 4266 NamedDecl *D = *Path.Decls.first; 4267 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4268 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4269 return true; 4270 } 4271 } 4272 4273 return false; 4274} 4275 4276/// AddOverriddenMethods - See if a method overrides any in the base classes, 4277/// and if so, check that it's a valid override and remember it. 4278bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4279 // Look for virtual methods in base classes that this method might override. 4280 CXXBasePaths Paths; 4281 FindOverriddenMethodData Data; 4282 Data.Method = MD; 4283 Data.S = this; 4284 bool AddedAny = false; 4285 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4286 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4287 E = Paths.found_decls_end(); I != E; ++I) { 4288 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4289 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4290 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4291 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4292 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4293 AddedAny = true; 4294 } 4295 } 4296 } 4297 } 4298 4299 return AddedAny; 4300} 4301 4302static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD, 4303 bool isFriendDecl) { 4304 DeclarationName Name = NewFD->getDeclName(); 4305 DeclContext *DC = NewFD->getDeclContext(); 4306 LookupResult Prev(S, Name, NewFD->getLocation(), 4307 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4308 llvm::SmallVector<unsigned, 1> MismatchedParams; 4309 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4310 TypoCorrection Correction; 4311 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4312 : diag::err_member_def_does_not_match; 4313 4314 NewFD->setInvalidDecl(); 4315 S.LookupQualifiedName(Prev, DC); 4316 assert(!Prev.isAmbiguous() && 4317 "Cannot have an ambiguity in previous-declaration lookup"); 4318 if (!Prev.empty()) { 4319 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4320 Func != FuncEnd; ++Func) { 4321 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4322 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4323 MismatchedParams)) { 4324 // Add 1 to the index so that 0 can mean the mismatch didn't 4325 // involve a parameter 4326 unsigned ParamNum = 4327 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4328 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4329 } 4330 } 4331 // If the qualified name lookup yielded nothing, try typo correction 4332 } else if ((Correction = S.CorrectTypo(Prev.getLookupNameInfo(), 4333 Prev.getLookupKind(), 0, 0, DC)) && 4334 Correction.getCorrection() != Name) { 4335 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4336 CDeclEnd = Correction.end(); 4337 CDecl != CDeclEnd; ++CDecl) { 4338 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4339 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4340 MismatchedParams)) { 4341 // Add 1 to the index so that 0 can mean the mismatch didn't 4342 // involve a parameter 4343 unsigned ParamNum = 4344 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4345 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4346 } 4347 } 4348 if (!NearMatches.empty()) 4349 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4350 : diag::err_member_def_does_not_match_suggest; 4351 } 4352 4353 // Ignore the correction if it didn't yield any close FunctionDecl matches 4354 if (Correction && NearMatches.empty()) 4355 Correction = TypoCorrection(); 4356 4357 if (Correction) 4358 S.Diag(NewFD->getLocation(), DiagMsg) 4359 << Name << DC << Correction.getQuoted(S.getLangOptions()) 4360 << FixItHint::CreateReplacement( 4361 NewFD->getLocation(), Correction.getAsString(S.getLangOptions())); 4362 else 4363 S.Diag(NewFD->getLocation(), DiagMsg) << Name << DC << NewFD->getLocation(); 4364 4365 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4366 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4367 NearMatch != NearMatchEnd; ++NearMatch) { 4368 FunctionDecl *FD = NearMatch->first; 4369 4370 if (unsigned Idx = NearMatch->second) { 4371 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4372 S.Diag(FDParam->getTypeSpecStartLoc(), 4373 diag::note_member_def_close_param_match) 4374 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4375 } else if (Correction) { 4376 S.Diag(FD->getLocation(), diag::note_previous_decl) 4377 << Correction.getQuoted(S.getLangOptions()); 4378 } else 4379 S.Diag(FD->getLocation(), diag::note_member_def_close_match); 4380 } 4381} 4382 4383NamedDecl* 4384Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4385 QualType R, TypeSourceInfo *TInfo, 4386 LookupResult &Previous, 4387 MultiTemplateParamsArg TemplateParamLists, 4388 bool IsFunctionDefinition, bool &Redeclaration, 4389 bool &AddToScope) { 4390 assert(R.getTypePtr()->isFunctionType()); 4391 4392 // TODO: consider using NameInfo for diagnostic. 4393 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4394 DeclarationName Name = NameInfo.getName(); 4395 FunctionDecl::StorageClass SC = SC_None; 4396 switch (D.getDeclSpec().getStorageClassSpec()) { 4397 default: llvm_unreachable("Unknown storage class!"); 4398 case DeclSpec::SCS_auto: 4399 case DeclSpec::SCS_register: 4400 case DeclSpec::SCS_mutable: 4401 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4402 diag::err_typecheck_sclass_func); 4403 D.setInvalidType(); 4404 break; 4405 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4406 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4407 case DeclSpec::SCS_static: { 4408 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4409 // C99 6.7.1p5: 4410 // The declaration of an identifier for a function that has 4411 // block scope shall have no explicit storage-class specifier 4412 // other than extern 4413 // See also (C++ [dcl.stc]p4). 4414 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4415 diag::err_static_block_func); 4416 SC = SC_None; 4417 } else 4418 SC = SC_Static; 4419 break; 4420 } 4421 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4422 } 4423 4424 if (D.getDeclSpec().isThreadSpecified()) 4425 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4426 4427 // Do not allow returning a objc interface by-value. 4428 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4429 Diag(D.getIdentifierLoc(), 4430 diag::err_object_cannot_be_passed_returned_by_value) << 0 4431 << R->getAs<FunctionType>()->getResultType() 4432 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4433 4434 QualType T = R->getAs<FunctionType>()->getResultType(); 4435 T = Context.getObjCObjectPointerType(T); 4436 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4437 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4438 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4439 FPT->getNumArgs(), EPI); 4440 } 4441 else if (isa<FunctionNoProtoType>(R)) 4442 R = Context.getFunctionNoProtoType(T); 4443 } 4444 4445 FunctionDecl *NewFD; 4446 bool isInline = D.getDeclSpec().isInlineSpecified(); 4447 bool isFriend = false; 4448 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4449 FunctionDecl::StorageClass SCAsWritten 4450 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4451 FunctionTemplateDecl *FunctionTemplate = 0; 4452 bool isExplicitSpecialization = false; 4453 bool isFunctionTemplateSpecialization = false; 4454 bool isDependentClassScopeExplicitSpecialization = false; 4455 4456 if (!getLangOptions().CPlusPlus) { 4457 // Determine whether the function was written with a 4458 // prototype. This true when: 4459 // - there is a prototype in the declarator, or 4460 // - the type R of the function is some kind of typedef or other reference 4461 // to a type name (which eventually refers to a function type). 4462 bool HasPrototype = 4463 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4464 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4465 4466 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4467 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4468 HasPrototype); 4469 if (D.isInvalidType()) 4470 NewFD->setInvalidDecl(); 4471 4472 // Set the lexical context. 4473 NewFD->setLexicalDeclContext(CurContext); 4474 // Filter out previous declarations that don't match the scope. 4475 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4476 /*ExplicitInstantiationOrSpecialization=*/false); 4477 } else { 4478 isFriend = D.getDeclSpec().isFriendSpecified(); 4479 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4480 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4481 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4482 bool isVirtualOkay = false; 4483 4484 // Check that the return type is not an abstract class type. 4485 // For record types, this is done by the AbstractClassUsageDiagnoser once 4486 // the class has been completely parsed. 4487 if (!DC->isRecord() && 4488 RequireNonAbstractType(D.getIdentifierLoc(), 4489 R->getAs<FunctionType>()->getResultType(), 4490 diag::err_abstract_type_in_decl, 4491 AbstractReturnType)) 4492 D.setInvalidType(); 4493 4494 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4495 // This is a C++ constructor declaration. 4496 assert(DC->isRecord() && 4497 "Constructors can only be declared in a member context"); 4498 4499 R = CheckConstructorDeclarator(D, R, SC); 4500 4501 // Create the new declaration 4502 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4503 Context, 4504 cast<CXXRecordDecl>(DC), 4505 D.getSourceRange().getBegin(), 4506 NameInfo, R, TInfo, 4507 isExplicit, isInline, 4508 /*isImplicitlyDeclared=*/false, 4509 isConstexpr); 4510 4511 NewFD = NewCD; 4512 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4513 // This is a C++ destructor declaration. 4514 if (DC->isRecord()) { 4515 R = CheckDestructorDeclarator(D, R, SC); 4516 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4517 4518 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4519 D.getSourceRange().getBegin(), 4520 NameInfo, R, TInfo, 4521 isInline, 4522 /*isImplicitlyDeclared=*/false); 4523 NewFD = NewDD; 4524 isVirtualOkay = true; 4525 4526 // If the class is complete, then we now create the implicit exception 4527 // specification. If the class is incomplete or dependent, we can't do 4528 // it yet. 4529 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4530 Record->getDefinition() && !Record->isBeingDefined() && 4531 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4532 AdjustDestructorExceptionSpec(Record, NewDD); 4533 } 4534 4535 } else { 4536 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4537 4538 // Create a FunctionDecl to satisfy the function definition parsing 4539 // code path. 4540 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4541 D.getIdentifierLoc(), Name, R, TInfo, 4542 SC, SCAsWritten, isInline, 4543 /*hasPrototype=*/true, isConstexpr); 4544 D.setInvalidType(); 4545 } 4546 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4547 if (!DC->isRecord()) { 4548 Diag(D.getIdentifierLoc(), 4549 diag::err_conv_function_not_member); 4550 return 0; 4551 } 4552 4553 CheckConversionDeclarator(D, R, SC); 4554 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4555 D.getSourceRange().getBegin(), 4556 NameInfo, R, TInfo, 4557 isInline, isExplicit, isConstexpr, 4558 SourceLocation()); 4559 4560 isVirtualOkay = true; 4561 } else if (DC->isRecord()) { 4562 // If the name of the function is the same as the name of the record, 4563 // then this must be an invalid constructor that has a return type. 4564 // (The parser checks for a return type and makes the declarator a 4565 // constructor if it has no return type). 4566 if (Name.getAsIdentifierInfo() && 4567 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4568 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4569 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4570 << SourceRange(D.getIdentifierLoc()); 4571 return 0; 4572 } 4573 4574 bool isStatic = SC == SC_Static; 4575 4576 // [class.free]p1: 4577 // Any allocation function for a class T is a static member 4578 // (even if not explicitly declared static). 4579 if (Name.getCXXOverloadedOperator() == OO_New || 4580 Name.getCXXOverloadedOperator() == OO_Array_New) 4581 isStatic = true; 4582 4583 // [class.free]p6 Any deallocation function for a class X is a static member 4584 // (even if not explicitly declared static). 4585 if (Name.getCXXOverloadedOperator() == OO_Delete || 4586 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4587 isStatic = true; 4588 4589 // This is a C++ method declaration. 4590 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4591 Context, cast<CXXRecordDecl>(DC), 4592 D.getSourceRange().getBegin(), 4593 NameInfo, R, TInfo, 4594 isStatic, SCAsWritten, isInline, 4595 isConstexpr, 4596 SourceLocation()); 4597 NewFD = NewMD; 4598 4599 isVirtualOkay = !isStatic; 4600 } else { 4601 // Determine whether the function was written with a 4602 // prototype. This true when: 4603 // - we're in C++ (where every function has a prototype), 4604 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4605 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4606 true/*HasPrototype*/, isConstexpr); 4607 } 4608 4609 if (isFriend && !isInline && IsFunctionDefinition) { 4610 // C++ [class.friend]p5 4611 // A function can be defined in a friend declaration of a 4612 // class . . . . Such a function is implicitly inline. 4613 NewFD->setImplicitlyInline(); 4614 } 4615 4616 SetNestedNameSpecifier(NewFD, D); 4617 isExplicitSpecialization = false; 4618 isFunctionTemplateSpecialization = false; 4619 if (D.isInvalidType()) 4620 NewFD->setInvalidDecl(); 4621 4622 // Set the lexical context. If the declarator has a C++ 4623 // scope specifier, or is the object of a friend declaration, the 4624 // lexical context will be different from the semantic context. 4625 NewFD->setLexicalDeclContext(CurContext); 4626 4627 // Match up the template parameter lists with the scope specifier, then 4628 // determine whether we have a template or a template specialization. 4629 bool Invalid = false; 4630 if (TemplateParameterList *TemplateParams 4631 = MatchTemplateParametersToScopeSpecifier( 4632 D.getDeclSpec().getSourceRange().getBegin(), 4633 D.getIdentifierLoc(), 4634 D.getCXXScopeSpec(), 4635 TemplateParamLists.get(), 4636 TemplateParamLists.size(), 4637 isFriend, 4638 isExplicitSpecialization, 4639 Invalid)) { 4640 if (TemplateParams->size() > 0) { 4641 // This is a function template 4642 4643 // Check that we can declare a template here. 4644 if (CheckTemplateDeclScope(S, TemplateParams)) 4645 return 0; 4646 4647 // A destructor cannot be a template. 4648 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4649 Diag(NewFD->getLocation(), diag::err_destructor_template); 4650 return 0; 4651 } 4652 4653 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4654 NewFD->getLocation(), 4655 Name, TemplateParams, 4656 NewFD); 4657 FunctionTemplate->setLexicalDeclContext(CurContext); 4658 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4659 4660 // For source fidelity, store the other template param lists. 4661 if (TemplateParamLists.size() > 1) { 4662 NewFD->setTemplateParameterListsInfo(Context, 4663 TemplateParamLists.size() - 1, 4664 TemplateParamLists.release()); 4665 } 4666 } else { 4667 // This is a function template specialization. 4668 isFunctionTemplateSpecialization = true; 4669 // For source fidelity, store all the template param lists. 4670 NewFD->setTemplateParameterListsInfo(Context, 4671 TemplateParamLists.size(), 4672 TemplateParamLists.release()); 4673 4674 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4675 if (isFriend) { 4676 // We want to remove the "template<>", found here. 4677 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4678 4679 // If we remove the template<> and the name is not a 4680 // template-id, we're actually silently creating a problem: 4681 // the friend declaration will refer to an untemplated decl, 4682 // and clearly the user wants a template specialization. So 4683 // we need to insert '<>' after the name. 4684 SourceLocation InsertLoc; 4685 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4686 InsertLoc = D.getName().getSourceRange().getEnd(); 4687 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4688 } 4689 4690 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4691 << Name << RemoveRange 4692 << FixItHint::CreateRemoval(RemoveRange) 4693 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4694 } 4695 } 4696 } 4697 else { 4698 // All template param lists were matched against the scope specifier: 4699 // this is NOT (an explicit specialization of) a template. 4700 if (TemplateParamLists.size() > 0) 4701 // For source fidelity, store all the template param lists. 4702 NewFD->setTemplateParameterListsInfo(Context, 4703 TemplateParamLists.size(), 4704 TemplateParamLists.release()); 4705 } 4706 4707 if (Invalid) { 4708 NewFD->setInvalidDecl(); 4709 if (FunctionTemplate) 4710 FunctionTemplate->setInvalidDecl(); 4711 } 4712 4713 // C++ [dcl.fct.spec]p5: 4714 // The virtual specifier shall only be used in declarations of 4715 // nonstatic class member functions that appear within a 4716 // member-specification of a class declaration; see 10.3. 4717 // 4718 if (isVirtual && !NewFD->isInvalidDecl()) { 4719 if (!isVirtualOkay) { 4720 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4721 diag::err_virtual_non_function); 4722 } else if (!CurContext->isRecord()) { 4723 // 'virtual' was specified outside of the class. 4724 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4725 diag::err_virtual_out_of_class) 4726 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4727 } else if (NewFD->getDescribedFunctionTemplate()) { 4728 // C++ [temp.mem]p3: 4729 // A member function template shall not be virtual. 4730 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4731 diag::err_virtual_member_function_template) 4732 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4733 } else { 4734 // Okay: Add virtual to the method. 4735 NewFD->setVirtualAsWritten(true); 4736 } 4737 } 4738 4739 // C++ [dcl.fct.spec]p3: 4740 // The inline specifier shall not appear on a block scope function declaration. 4741 if (isInline && !NewFD->isInvalidDecl()) { 4742 if (CurContext->isFunctionOrMethod()) { 4743 // 'inline' is not allowed on block scope function declaration. 4744 Diag(D.getDeclSpec().getInlineSpecLoc(), 4745 diag::err_inline_declaration_block_scope) << Name 4746 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4747 } 4748 } 4749 4750 // C++ [dcl.fct.spec]p6: 4751 // The explicit specifier shall be used only in the declaration of a 4752 // constructor or conversion function within its class definition; see 12.3.1 4753 // and 12.3.2. 4754 if (isExplicit && !NewFD->isInvalidDecl()) { 4755 if (!CurContext->isRecord()) { 4756 // 'explicit' was specified outside of the class. 4757 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4758 diag::err_explicit_out_of_class) 4759 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4760 } else if (!isa<CXXConstructorDecl>(NewFD) && 4761 !isa<CXXConversionDecl>(NewFD)) { 4762 // 'explicit' was specified on a function that wasn't a constructor 4763 // or conversion function. 4764 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4765 diag::err_explicit_non_ctor_or_conv_function) 4766 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4767 } 4768 } 4769 4770 if (isConstexpr) { 4771 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4772 // are implicitly inline. 4773 NewFD->setImplicitlyInline(); 4774 4775 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4776 // be either constructors or to return a literal type. Therefore, 4777 // destructors cannot be declared constexpr. 4778 if (isa<CXXDestructorDecl>(NewFD)) 4779 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4780 } 4781 4782 // If __module_private__ was specified, mark the function accordingly. 4783 if (D.getDeclSpec().isModulePrivateSpecified()) { 4784 if (isFunctionTemplateSpecialization) { 4785 SourceLocation ModulePrivateLoc 4786 = D.getDeclSpec().getModulePrivateSpecLoc(); 4787 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4788 << 0 4789 << FixItHint::CreateRemoval(ModulePrivateLoc); 4790 } else { 4791 NewFD->setModulePrivate(); 4792 if (FunctionTemplate) 4793 FunctionTemplate->setModulePrivate(); 4794 } 4795 } 4796 4797 // Filter out previous declarations that don't match the scope. 4798 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4799 isExplicitSpecialization || 4800 isFunctionTemplateSpecialization); 4801 4802 if (isFriend) { 4803 // For now, claim that the objects have no previous declaration. 4804 if (FunctionTemplate) { 4805 FunctionTemplate->setObjectOfFriendDecl(false); 4806 FunctionTemplate->setAccess(AS_public); 4807 } 4808 NewFD->setObjectOfFriendDecl(false); 4809 NewFD->setAccess(AS_public); 4810 } 4811 4812 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4813 // A method is implicitly inline if it's defined in its class 4814 // definition. 4815 NewFD->setImplicitlyInline(); 4816 } 4817 4818 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4819 !CurContext->isRecord()) { 4820 // C++ [class.static]p1: 4821 // A data or function member of a class may be declared static 4822 // in a class definition, in which case it is a static member of 4823 // the class. 4824 4825 // Complain about the 'static' specifier if it's on an out-of-line 4826 // member function definition. 4827 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4828 diag::err_static_out_of_line) 4829 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4830 } 4831 } 4832 4833 // Handle GNU asm-label extension (encoded as an attribute). 4834 if (Expr *E = (Expr*) D.getAsmLabel()) { 4835 // The parser guarantees this is a string. 4836 StringLiteral *SE = cast<StringLiteral>(E); 4837 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4838 SE->getString())); 4839 } 4840 4841 // Copy the parameter declarations from the declarator D to the function 4842 // declaration NewFD, if they are available. First scavenge them into Params. 4843 SmallVector<ParmVarDecl*, 16> Params; 4844 if (D.isFunctionDeclarator()) { 4845 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4846 4847 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4848 // function that takes no arguments, not a function that takes a 4849 // single void argument. 4850 // We let through "const void" here because Sema::GetTypeForDeclarator 4851 // already checks for that case. 4852 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4853 FTI.ArgInfo[0].Param && 4854 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4855 // Empty arg list, don't push any params. 4856 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4857 4858 // In C++, the empty parameter-type-list must be spelled "void"; a 4859 // typedef of void is not permitted. 4860 if (getLangOptions().CPlusPlus && 4861 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4862 bool IsTypeAlias = false; 4863 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4864 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4865 else if (const TemplateSpecializationType *TST = 4866 Param->getType()->getAs<TemplateSpecializationType>()) 4867 IsTypeAlias = TST->isTypeAlias(); 4868 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4869 << IsTypeAlias; 4870 } 4871 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4872 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4873 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4874 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4875 Param->setDeclContext(NewFD); 4876 Params.push_back(Param); 4877 4878 if (Param->isInvalidDecl()) 4879 NewFD->setInvalidDecl(); 4880 } 4881 } 4882 4883 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4884 // When we're declaring a function with a typedef, typeof, etc as in the 4885 // following example, we'll need to synthesize (unnamed) 4886 // parameters for use in the declaration. 4887 // 4888 // @code 4889 // typedef void fn(int); 4890 // fn f; 4891 // @endcode 4892 4893 // Synthesize a parameter for each argument type. 4894 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4895 AE = FT->arg_type_end(); AI != AE; ++AI) { 4896 ParmVarDecl *Param = 4897 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4898 Param->setScopeInfo(0, Params.size()); 4899 Params.push_back(Param); 4900 } 4901 } else { 4902 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4903 "Should not need args for typedef of non-prototype fn"); 4904 } 4905 // Finally, we know we have the right number of parameters, install them. 4906 NewFD->setParams(Params); 4907 4908 // Process the non-inheritable attributes on this declaration. 4909 ProcessDeclAttributes(S, NewFD, D, 4910 /*NonInheritable=*/true, /*Inheritable=*/false); 4911 4912 if (!getLangOptions().CPlusPlus) { 4913 // Perform semantic checking on the function declaration. 4914 bool isExplicitSpecialization=false; 4915 if (!NewFD->isInvalidDecl()) { 4916 if (NewFD->getResultType()->isVariablyModifiedType()) { 4917 // Functions returning a variably modified type violate C99 6.7.5.2p2 4918 // because all functions have linkage. 4919 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4920 NewFD->setInvalidDecl(); 4921 } else { 4922 if (NewFD->isMain()) 4923 CheckMain(NewFD, D.getDeclSpec()); 4924 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4925 Redeclaration); 4926 } 4927 } 4928 assert((NewFD->isInvalidDecl() || !Redeclaration || 4929 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4930 "previous declaration set still overloaded"); 4931 } else { 4932 // If the declarator is a template-id, translate the parser's template 4933 // argument list into our AST format. 4934 bool HasExplicitTemplateArgs = false; 4935 TemplateArgumentListInfo TemplateArgs; 4936 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4937 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4938 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4939 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4940 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4941 TemplateId->getTemplateArgs(), 4942 TemplateId->NumArgs); 4943 translateTemplateArguments(TemplateArgsPtr, 4944 TemplateArgs); 4945 TemplateArgsPtr.release(); 4946 4947 HasExplicitTemplateArgs = true; 4948 4949 if (NewFD->isInvalidDecl()) { 4950 HasExplicitTemplateArgs = false; 4951 } else if (FunctionTemplate) { 4952 // Function template with explicit template arguments. 4953 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4954 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4955 4956 HasExplicitTemplateArgs = false; 4957 } else if (!isFunctionTemplateSpecialization && 4958 !D.getDeclSpec().isFriendSpecified()) { 4959 // We have encountered something that the user meant to be a 4960 // specialization (because it has explicitly-specified template 4961 // arguments) but that was not introduced with a "template<>" (or had 4962 // too few of them). 4963 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4964 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4965 << FixItHint::CreateInsertion( 4966 D.getDeclSpec().getSourceRange().getBegin(), 4967 "template<> "); 4968 isFunctionTemplateSpecialization = true; 4969 } else { 4970 // "friend void foo<>(int);" is an implicit specialization decl. 4971 isFunctionTemplateSpecialization = true; 4972 } 4973 } else if (isFriend && isFunctionTemplateSpecialization) { 4974 // This combination is only possible in a recovery case; the user 4975 // wrote something like: 4976 // template <> friend void foo(int); 4977 // which we're recovering from as if the user had written: 4978 // friend void foo<>(int); 4979 // Go ahead and fake up a template id. 4980 HasExplicitTemplateArgs = true; 4981 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4982 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4983 } 4984 4985 // If it's a friend (and only if it's a friend), it's possible 4986 // that either the specialized function type or the specialized 4987 // template is dependent, and therefore matching will fail. In 4988 // this case, don't check the specialization yet. 4989 if (isFunctionTemplateSpecialization && isFriend && 4990 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4991 assert(HasExplicitTemplateArgs && 4992 "friend function specialization without template args"); 4993 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4994 Previous)) 4995 NewFD->setInvalidDecl(); 4996 } else if (isFunctionTemplateSpecialization) { 4997 if (CurContext->isDependentContext() && CurContext->isRecord() 4998 && !isFriend) { 4999 isDependentClassScopeExplicitSpecialization = true; 5000 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5001 diag::ext_function_specialization_in_class : 5002 diag::err_function_specialization_in_class) 5003 << NewFD->getDeclName(); 5004 } else if (CheckFunctionTemplateSpecialization(NewFD, 5005 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5006 Previous)) 5007 NewFD->setInvalidDecl(); 5008 5009 // C++ [dcl.stc]p1: 5010 // A storage-class-specifier shall not be specified in an explicit 5011 // specialization (14.7.3) 5012 if (SC != SC_None) { 5013 if (SC != NewFD->getStorageClass()) 5014 Diag(NewFD->getLocation(), 5015 diag::err_explicit_specialization_inconsistent_storage_class) 5016 << SC 5017 << FixItHint::CreateRemoval( 5018 D.getDeclSpec().getStorageClassSpecLoc()); 5019 5020 else 5021 Diag(NewFD->getLocation(), 5022 diag::ext_explicit_specialization_storage_class) 5023 << FixItHint::CreateRemoval( 5024 D.getDeclSpec().getStorageClassSpecLoc()); 5025 } 5026 5027 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5028 if (CheckMemberSpecialization(NewFD, Previous)) 5029 NewFD->setInvalidDecl(); 5030 } 5031 5032 // Perform semantic checking on the function declaration. 5033 if (!isDependentClassScopeExplicitSpecialization) { 5034 if (NewFD->isInvalidDecl()) { 5035 // If this is a class member, mark the class invalid immediately. 5036 // This avoids some consistency errors later. 5037 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5038 methodDecl->getParent()->setInvalidDecl(); 5039 } else { 5040 if (NewFD->isMain()) 5041 CheckMain(NewFD, D.getDeclSpec()); 5042 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 5043 Redeclaration); 5044 } 5045 } 5046 5047 assert((NewFD->isInvalidDecl() || !Redeclaration || 5048 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5049 "previous declaration set still overloaded"); 5050 5051 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5052 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5053 NewFD->setInvalidDecl(); 5054 5055 NamedDecl *PrincipalDecl = (FunctionTemplate 5056 ? cast<NamedDecl>(FunctionTemplate) 5057 : NewFD); 5058 5059 if (isFriend && Redeclaration) { 5060 AccessSpecifier Access = AS_public; 5061 if (!NewFD->isInvalidDecl()) 5062 Access = NewFD->getPreviousDeclaration()->getAccess(); 5063 5064 NewFD->setAccess(Access); 5065 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5066 5067 PrincipalDecl->setObjectOfFriendDecl(true); 5068 } 5069 5070 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5071 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5072 PrincipalDecl->setNonMemberOperator(); 5073 5074 // If we have a function template, check the template parameter 5075 // list. This will check and merge default template arguments. 5076 if (FunctionTemplate) { 5077 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 5078 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5079 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 5080 D.getDeclSpec().isFriendSpecified() 5081 ? (IsFunctionDefinition 5082 ? TPC_FriendFunctionTemplateDefinition 5083 : TPC_FriendFunctionTemplate) 5084 : (D.getCXXScopeSpec().isSet() && 5085 DC && DC->isRecord() && 5086 DC->isDependentContext()) 5087 ? TPC_ClassTemplateMember 5088 : TPC_FunctionTemplate); 5089 } 5090 5091 if (NewFD->isInvalidDecl()) { 5092 // Ignore all the rest of this. 5093 } else if (!Redeclaration) { 5094 // Fake up an access specifier if it's supposed to be a class member. 5095 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5096 NewFD->setAccess(AS_public); 5097 5098 // Qualified decls generally require a previous declaration. 5099 if (D.getCXXScopeSpec().isSet()) { 5100 // ...with the major exception of templated-scope or 5101 // dependent-scope friend declarations. 5102 5103 // TODO: we currently also suppress this check in dependent 5104 // contexts because (1) the parameter depth will be off when 5105 // matching friend templates and (2) we might actually be 5106 // selecting a friend based on a dependent factor. But there 5107 // are situations where these conditions don't apply and we 5108 // can actually do this check immediately. 5109 if (isFriend && 5110 (TemplateParamLists.size() || 5111 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5112 CurContext->isDependentContext())) { 5113 // ignore these 5114 } else { 5115 // The user tried to provide an out-of-line definition for a 5116 // function that is a member of a class or namespace, but there 5117 // was no such member function declared (C++ [class.mfct]p2, 5118 // C++ [namespace.memdef]p2). For example: 5119 // 5120 // class X { 5121 // void f() const; 5122 // }; 5123 // 5124 // void X::f() { } // ill-formed 5125 // 5126 // Complain about this problem, and attempt to suggest close 5127 // matches (e.g., those that differ only in cv-qualifiers and 5128 // whether the parameter types are references). 5129 5130 DiagnoseInvalidRedeclaration(*this, NewFD, false); 5131 } 5132 5133 // Unqualified local friend declarations are required to resolve 5134 // to something. 5135 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5136 DiagnoseInvalidRedeclaration(*this, NewFD, true); 5137 } 5138 5139 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 5140 !isFriend && !isFunctionTemplateSpecialization && 5141 !isExplicitSpecialization) { 5142 // An out-of-line member function declaration must also be a 5143 // definition (C++ [dcl.meaning]p1). 5144 // Note that this is not the case for explicit specializations of 5145 // function templates or member functions of class templates, per 5146 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5147 // for compatibility with old SWIG code which likes to generate them. 5148 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5149 << D.getCXXScopeSpec().getRange(); 5150 } 5151 } 5152 5153 5154 // Handle attributes. We need to have merged decls when handling attributes 5155 // (for example to check for conflicts, etc). 5156 // FIXME: This needs to happen before we merge declarations. Then, 5157 // let attribute merging cope with attribute conflicts. 5158 ProcessDeclAttributes(S, NewFD, D, 5159 /*NonInheritable=*/false, /*Inheritable=*/true); 5160 5161 // attributes declared post-definition are currently ignored 5162 // FIXME: This should happen during attribute merging 5163 if (Redeclaration && Previous.isSingleResult()) { 5164 const FunctionDecl *Def; 5165 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5166 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5167 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5168 Diag(Def->getLocation(), diag::note_previous_definition); 5169 } 5170 } 5171 5172 AddKnownFunctionAttributes(NewFD); 5173 5174 if (NewFD->hasAttr<OverloadableAttr>() && 5175 !NewFD->getType()->getAs<FunctionProtoType>()) { 5176 Diag(NewFD->getLocation(), 5177 diag::err_attribute_overloadable_no_prototype) 5178 << NewFD; 5179 5180 // Turn this into a variadic function with no parameters. 5181 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5182 FunctionProtoType::ExtProtoInfo EPI; 5183 EPI.Variadic = true; 5184 EPI.ExtInfo = FT->getExtInfo(); 5185 5186 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5187 NewFD->setType(R); 5188 } 5189 5190 // If there's a #pragma GCC visibility in scope, and this isn't a class 5191 // member, set the visibility of this function. 5192 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5193 AddPushedVisibilityAttribute(NewFD); 5194 5195 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5196 // marking the function. 5197 AddCFAuditedAttribute(NewFD); 5198 5199 // If this is a locally-scoped extern C function, update the 5200 // map of such names. 5201 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5202 && !NewFD->isInvalidDecl()) 5203 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5204 5205 // Set this FunctionDecl's range up to the right paren. 5206 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5207 5208 if (getLangOptions().CPlusPlus) { 5209 if (FunctionTemplate) { 5210 if (NewFD->isInvalidDecl()) 5211 FunctionTemplate->setInvalidDecl(); 5212 return FunctionTemplate; 5213 } 5214 } 5215 5216 MarkUnusedFileScopedDecl(NewFD); 5217 5218 if (getLangOptions().CUDA) 5219 if (IdentifierInfo *II = NewFD->getIdentifier()) 5220 if (!NewFD->isInvalidDecl() && 5221 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5222 if (II->isStr("cudaConfigureCall")) { 5223 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5224 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5225 5226 Context.setcudaConfigureCallDecl(NewFD); 5227 } 5228 } 5229 5230 // Here we have an function template explicit specialization at class scope. 5231 // The actually specialization will be postponed to template instatiation 5232 // time via the ClassScopeFunctionSpecializationDecl node. 5233 if (isDependentClassScopeExplicitSpecialization) { 5234 ClassScopeFunctionSpecializationDecl *NewSpec = 5235 ClassScopeFunctionSpecializationDecl::Create( 5236 Context, CurContext, SourceLocation(), 5237 cast<CXXMethodDecl>(NewFD)); 5238 CurContext->addDecl(NewSpec); 5239 AddToScope = false; 5240 } 5241 5242 return NewFD; 5243} 5244 5245/// \brief Perform semantic checking of a new function declaration. 5246/// 5247/// Performs semantic analysis of the new function declaration 5248/// NewFD. This routine performs all semantic checking that does not 5249/// require the actual declarator involved in the declaration, and is 5250/// used both for the declaration of functions as they are parsed 5251/// (called via ActOnDeclarator) and for the declaration of functions 5252/// that have been instantiated via C++ template instantiation (called 5253/// via InstantiateDecl). 5254/// 5255/// \param IsExplicitSpecialiation whether this new function declaration is 5256/// an explicit specialization of the previous declaration. 5257/// 5258/// This sets NewFD->isInvalidDecl() to true if there was an error. 5259void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5260 LookupResult &Previous, 5261 bool IsExplicitSpecialization, 5262 bool &Redeclaration) { 5263 assert(!NewFD->getResultType()->isVariablyModifiedType() 5264 && "Variably modified return types are not handled here"); 5265 5266 // Check for a previous declaration of this name. 5267 if (Previous.empty() && NewFD->isExternC()) { 5268 // Since we did not find anything by this name and we're declaring 5269 // an extern "C" function, look for a non-visible extern "C" 5270 // declaration with the same name. 5271 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5272 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5273 if (Pos != LocallyScopedExternalDecls.end()) 5274 Previous.addDecl(Pos->second); 5275 } 5276 5277 // Merge or overload the declaration with an existing declaration of 5278 // the same name, if appropriate. 5279 if (!Previous.empty()) { 5280 // Determine whether NewFD is an overload of PrevDecl or 5281 // a declaration that requires merging. If it's an overload, 5282 // there's no more work to do here; we'll just add the new 5283 // function to the scope. 5284 5285 NamedDecl *OldDecl = 0; 5286 if (!AllowOverloadingOfFunction(Previous, Context)) { 5287 Redeclaration = true; 5288 OldDecl = Previous.getFoundDecl(); 5289 } else { 5290 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5291 /*NewIsUsingDecl*/ false)) { 5292 case Ovl_Match: 5293 Redeclaration = true; 5294 break; 5295 5296 case Ovl_NonFunction: 5297 Redeclaration = true; 5298 break; 5299 5300 case Ovl_Overload: 5301 Redeclaration = false; 5302 break; 5303 } 5304 5305 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5306 // If a function name is overloadable in C, then every function 5307 // with that name must be marked "overloadable". 5308 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5309 << Redeclaration << NewFD; 5310 NamedDecl *OverloadedDecl = 0; 5311 if (Redeclaration) 5312 OverloadedDecl = OldDecl; 5313 else if (!Previous.empty()) 5314 OverloadedDecl = Previous.getRepresentativeDecl(); 5315 if (OverloadedDecl) 5316 Diag(OverloadedDecl->getLocation(), 5317 diag::note_attribute_overloadable_prev_overload); 5318 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5319 Context)); 5320 } 5321 } 5322 5323 if (Redeclaration) { 5324 // NewFD and OldDecl represent declarations that need to be 5325 // merged. 5326 if (MergeFunctionDecl(NewFD, OldDecl)) 5327 return NewFD->setInvalidDecl(); 5328 5329 Previous.clear(); 5330 Previous.addDecl(OldDecl); 5331 5332 if (FunctionTemplateDecl *OldTemplateDecl 5333 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5334 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5335 FunctionTemplateDecl *NewTemplateDecl 5336 = NewFD->getDescribedFunctionTemplate(); 5337 assert(NewTemplateDecl && "Template/non-template mismatch"); 5338 if (CXXMethodDecl *Method 5339 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5340 Method->setAccess(OldTemplateDecl->getAccess()); 5341 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5342 } 5343 5344 // If this is an explicit specialization of a member that is a function 5345 // template, mark it as a member specialization. 5346 if (IsExplicitSpecialization && 5347 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5348 NewTemplateDecl->setMemberSpecialization(); 5349 assert(OldTemplateDecl->isMemberSpecialization()); 5350 } 5351 5352 if (OldTemplateDecl->isModulePrivate()) 5353 NewTemplateDecl->setModulePrivate(); 5354 5355 } else { 5356 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5357 NewFD->setAccess(OldDecl->getAccess()); 5358 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5359 } 5360 } 5361 } 5362 5363 // Semantic checking for this function declaration (in isolation). 5364 if (getLangOptions().CPlusPlus) { 5365 // C++-specific checks. 5366 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5367 CheckConstructor(Constructor); 5368 } else if (CXXDestructorDecl *Destructor = 5369 dyn_cast<CXXDestructorDecl>(NewFD)) { 5370 CXXRecordDecl *Record = Destructor->getParent(); 5371 QualType ClassType = Context.getTypeDeclType(Record); 5372 5373 // FIXME: Shouldn't we be able to perform this check even when the class 5374 // type is dependent? Both gcc and edg can handle that. 5375 if (!ClassType->isDependentType()) { 5376 DeclarationName Name 5377 = Context.DeclarationNames.getCXXDestructorName( 5378 Context.getCanonicalType(ClassType)); 5379 if (NewFD->getDeclName() != Name) { 5380 Diag(NewFD->getLocation(), diag::err_destructor_name); 5381 return NewFD->setInvalidDecl(); 5382 } 5383 } 5384 } else if (CXXConversionDecl *Conversion 5385 = dyn_cast<CXXConversionDecl>(NewFD)) { 5386 ActOnConversionDeclarator(Conversion); 5387 } 5388 5389 // Find any virtual functions that this function overrides. 5390 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5391 if (!Method->isFunctionTemplateSpecialization() && 5392 !Method->getDescribedFunctionTemplate()) { 5393 if (AddOverriddenMethods(Method->getParent(), Method)) { 5394 // If the function was marked as "static", we have a problem. 5395 if (NewFD->getStorageClass() == SC_Static) { 5396 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5397 << NewFD->getDeclName(); 5398 for (CXXMethodDecl::method_iterator 5399 Overridden = Method->begin_overridden_methods(), 5400 OverriddenEnd = Method->end_overridden_methods(); 5401 Overridden != OverriddenEnd; 5402 ++Overridden) { 5403 Diag((*Overridden)->getLocation(), 5404 diag::note_overridden_virtual_function); 5405 } 5406 } 5407 } 5408 } 5409 } 5410 5411 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5412 if (NewFD->isOverloadedOperator() && 5413 CheckOverloadedOperatorDeclaration(NewFD)) 5414 return NewFD->setInvalidDecl(); 5415 5416 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5417 if (NewFD->getLiteralIdentifier() && 5418 CheckLiteralOperatorDeclaration(NewFD)) 5419 return NewFD->setInvalidDecl(); 5420 5421 // In C++, check default arguments now that we have merged decls. Unless 5422 // the lexical context is the class, because in this case this is done 5423 // during delayed parsing anyway. 5424 if (!CurContext->isRecord()) 5425 CheckCXXDefaultArguments(NewFD); 5426 5427 // If this function declares a builtin function, check the type of this 5428 // declaration against the expected type for the builtin. 5429 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5430 ASTContext::GetBuiltinTypeError Error; 5431 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5432 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5433 // The type of this function differs from the type of the builtin, 5434 // so forget about the builtin entirely. 5435 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5436 } 5437 } 5438 } 5439} 5440 5441void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5442 // C++ [basic.start.main]p3: A program that declares main to be inline 5443 // or static is ill-formed. 5444 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5445 // shall not appear in a declaration of main. 5446 // static main is not an error under C99, but we should warn about it. 5447 if (FD->getStorageClass() == SC_Static) 5448 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5449 ? diag::err_static_main : diag::warn_static_main) 5450 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5451 if (FD->isInlineSpecified()) 5452 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5453 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5454 5455 QualType T = FD->getType(); 5456 assert(T->isFunctionType() && "function decl is not of function type"); 5457 const FunctionType* FT = T->getAs<FunctionType>(); 5458 5459 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5460 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5461 FD->setInvalidDecl(true); 5462 } 5463 5464 // Treat protoless main() as nullary. 5465 if (isa<FunctionNoProtoType>(FT)) return; 5466 5467 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5468 unsigned nparams = FTP->getNumArgs(); 5469 assert(FD->getNumParams() == nparams); 5470 5471 bool HasExtraParameters = (nparams > 3); 5472 5473 // Darwin passes an undocumented fourth argument of type char**. If 5474 // other platforms start sprouting these, the logic below will start 5475 // getting shifty. 5476 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5477 HasExtraParameters = false; 5478 5479 if (HasExtraParameters) { 5480 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5481 FD->setInvalidDecl(true); 5482 nparams = 3; 5483 } 5484 5485 // FIXME: a lot of the following diagnostics would be improved 5486 // if we had some location information about types. 5487 5488 QualType CharPP = 5489 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5490 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5491 5492 for (unsigned i = 0; i < nparams; ++i) { 5493 QualType AT = FTP->getArgType(i); 5494 5495 bool mismatch = true; 5496 5497 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5498 mismatch = false; 5499 else if (Expected[i] == CharPP) { 5500 // As an extension, the following forms are okay: 5501 // char const ** 5502 // char const * const * 5503 // char * const * 5504 5505 QualifierCollector qs; 5506 const PointerType* PT; 5507 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5508 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5509 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5510 qs.removeConst(); 5511 mismatch = !qs.empty(); 5512 } 5513 } 5514 5515 if (mismatch) { 5516 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5517 // TODO: suggest replacing given type with expected type 5518 FD->setInvalidDecl(true); 5519 } 5520 } 5521 5522 if (nparams == 1 && !FD->isInvalidDecl()) { 5523 Diag(FD->getLocation(), diag::warn_main_one_arg); 5524 } 5525 5526 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5527 Diag(FD->getLocation(), diag::err_main_template_decl); 5528 FD->setInvalidDecl(); 5529 } 5530} 5531 5532bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5533 // FIXME: Need strict checking. In C89, we need to check for 5534 // any assignment, increment, decrement, function-calls, or 5535 // commas outside of a sizeof. In C99, it's the same list, 5536 // except that the aforementioned are allowed in unevaluated 5537 // expressions. Everything else falls under the 5538 // "may accept other forms of constant expressions" exception. 5539 // (We never end up here for C++, so the constant expression 5540 // rules there don't matter.) 5541 if (Init->isConstantInitializer(Context, false)) 5542 return false; 5543 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5544 << Init->getSourceRange(); 5545 return true; 5546} 5547 5548namespace { 5549 // Visits an initialization expression to see if OrigDecl is evaluated in 5550 // its own initialization and throws a warning if it does. 5551 class SelfReferenceChecker 5552 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5553 Sema &S; 5554 Decl *OrigDecl; 5555 bool isRecordType; 5556 bool isPODType; 5557 5558 public: 5559 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5560 5561 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5562 S(S), OrigDecl(OrigDecl) { 5563 isPODType = false; 5564 isRecordType = false; 5565 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5566 isPODType = VD->getType().isPODType(S.Context); 5567 isRecordType = VD->getType()->isRecordType(); 5568 } 5569 } 5570 5571 void VisitExpr(Expr *E) { 5572 if (isa<ObjCMessageExpr>(*E)) return; 5573 if (isRecordType) { 5574 Expr *expr = E; 5575 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5576 ValueDecl *VD = ME->getMemberDecl(); 5577 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5578 expr = ME->getBase(); 5579 } 5580 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5581 HandleDeclRefExpr(DRE); 5582 return; 5583 } 5584 } 5585 Inherited::VisitExpr(E); 5586 } 5587 5588 void VisitMemberExpr(MemberExpr *E) { 5589 if (E->getType()->canDecayToPointerType()) return; 5590 if (isa<FieldDecl>(E->getMemberDecl())) 5591 if (DeclRefExpr *DRE 5592 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5593 HandleDeclRefExpr(DRE); 5594 return; 5595 } 5596 Inherited::VisitMemberExpr(E); 5597 } 5598 5599 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5600 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5601 (isRecordType && E->getCastKind() == CK_NoOp)) { 5602 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5603 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5604 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5605 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5606 HandleDeclRefExpr(DRE); 5607 return; 5608 } 5609 } 5610 Inherited::VisitImplicitCastExpr(E); 5611 } 5612 5613 void VisitUnaryOperator(UnaryOperator *E) { 5614 // For POD record types, addresses of its own members are well-defined. 5615 if (isRecordType && isPODType) return; 5616 Inherited::VisitUnaryOperator(E); 5617 } 5618 5619 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5620 Decl* ReferenceDecl = DRE->getDecl(); 5621 if (OrigDecl != ReferenceDecl) return; 5622 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5623 Sema::NotForRedeclaration); 5624 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5625 S.PDiag(diag::warn_uninit_self_reference_in_init) 5626 << Result.getLookupName() 5627 << OrigDecl->getLocation() 5628 << DRE->getSourceRange()); 5629 } 5630 }; 5631} 5632 5633/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5634void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5635 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5636} 5637 5638/// AddInitializerToDecl - Adds the initializer Init to the 5639/// declaration dcl. If DirectInit is true, this is C++ direct 5640/// initialization rather than copy initialization. 5641void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5642 bool DirectInit, bool TypeMayContainAuto) { 5643 // If there is no declaration, there was an error parsing it. Just ignore 5644 // the initializer. 5645 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5646 return; 5647 5648 // Check for self-references within variable initializers. 5649 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5650 // Variables declared within a function/method body are handled 5651 // by a dataflow analysis. 5652 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5653 CheckSelfReference(RealDecl, Init); 5654 } 5655 else { 5656 CheckSelfReference(RealDecl, Init); 5657 } 5658 5659 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5660 // With declarators parsed the way they are, the parser cannot 5661 // distinguish between a normal initializer and a pure-specifier. 5662 // Thus this grotesque test. 5663 IntegerLiteral *IL; 5664 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5665 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5666 CheckPureMethod(Method, Init->getSourceRange()); 5667 else { 5668 Diag(Method->getLocation(), diag::err_member_function_initialization) 5669 << Method->getDeclName() << Init->getSourceRange(); 5670 Method->setInvalidDecl(); 5671 } 5672 return; 5673 } 5674 5675 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5676 if (!VDecl) { 5677 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5678 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5679 RealDecl->setInvalidDecl(); 5680 return; 5681 } 5682 5683 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5684 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5685 TypeSourceInfo *DeducedType = 0; 5686 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5687 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5688 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5689 << Init->getSourceRange(); 5690 if (!DeducedType) { 5691 RealDecl->setInvalidDecl(); 5692 return; 5693 } 5694 VDecl->setTypeSourceInfo(DeducedType); 5695 VDecl->setType(DeducedType->getType()); 5696 5697 // In ARC, infer lifetime. 5698 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5699 VDecl->setInvalidDecl(); 5700 5701 // If this is a redeclaration, check that the type we just deduced matches 5702 // the previously declared type. 5703 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5704 MergeVarDeclTypes(VDecl, Old); 5705 } 5706 5707 5708 // A definition must end up with a complete type, which means it must be 5709 // complete with the restriction that an array type might be completed by the 5710 // initializer; note that later code assumes this restriction. 5711 QualType BaseDeclType = VDecl->getType(); 5712 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5713 BaseDeclType = Array->getElementType(); 5714 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5715 diag::err_typecheck_decl_incomplete_type)) { 5716 RealDecl->setInvalidDecl(); 5717 return; 5718 } 5719 5720 // The variable can not have an abstract class type. 5721 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5722 diag::err_abstract_type_in_decl, 5723 AbstractVariableType)) 5724 VDecl->setInvalidDecl(); 5725 5726 const VarDecl *Def; 5727 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5728 Diag(VDecl->getLocation(), diag::err_redefinition) 5729 << VDecl->getDeclName(); 5730 Diag(Def->getLocation(), diag::note_previous_definition); 5731 VDecl->setInvalidDecl(); 5732 return; 5733 } 5734 5735 const VarDecl* PrevInit = 0; 5736 if (getLangOptions().CPlusPlus) { 5737 // C++ [class.static.data]p4 5738 // If a static data member is of const integral or const 5739 // enumeration type, its declaration in the class definition can 5740 // specify a constant-initializer which shall be an integral 5741 // constant expression (5.19). In that case, the member can appear 5742 // in integral constant expressions. The member shall still be 5743 // defined in a namespace scope if it is used in the program and the 5744 // namespace scope definition shall not contain an initializer. 5745 // 5746 // We already performed a redefinition check above, but for static 5747 // data members we also need to check whether there was an in-class 5748 // declaration with an initializer. 5749 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5750 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5751 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5752 return; 5753 } 5754 5755 if (VDecl->hasLocalStorage()) 5756 getCurFunction()->setHasBranchProtectedScope(); 5757 5758 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5759 VDecl->setInvalidDecl(); 5760 return; 5761 } 5762 } 5763 5764 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5765 // a kernel function cannot be initialized." 5766 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5767 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5768 VDecl->setInvalidDecl(); 5769 return; 5770 } 5771 5772 // Capture the variable that is being initialized and the style of 5773 // initialization. 5774 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5775 5776 // FIXME: Poor source location information. 5777 InitializationKind Kind 5778 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5779 Init->getLocStart(), 5780 Init->getLocEnd()) 5781 : InitializationKind::CreateCopy(VDecl->getLocation(), 5782 Init->getLocStart()); 5783 5784 // Get the decls type and save a reference for later, since 5785 // CheckInitializerTypes may change it. 5786 QualType DclT = VDecl->getType(), SavT = DclT; 5787 if (VDecl->isLocalVarDecl()) { 5788 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5789 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5790 VDecl->setInvalidDecl(); 5791 } else if (!VDecl->isInvalidDecl()) { 5792 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5793 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5794 MultiExprArg(*this, &Init, 1), 5795 &DclT); 5796 if (Result.isInvalid()) { 5797 VDecl->setInvalidDecl(); 5798 return; 5799 } 5800 5801 Init = Result.takeAs<Expr>(); 5802 5803 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5804 // Don't check invalid declarations to avoid emitting useless diagnostics. 5805 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5806 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5807 CheckForConstantInitializer(Init, DclT); 5808 } 5809 } 5810 } else if (VDecl->isStaticDataMember() && 5811 VDecl->getLexicalDeclContext()->isRecord()) { 5812 // This is an in-class initialization for a static data member, e.g., 5813 // 5814 // struct S { 5815 // static const int value = 17; 5816 // }; 5817 5818 // Try to perform the initialization regardless. 5819 if (!VDecl->isInvalidDecl()) { 5820 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5821 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5822 MultiExprArg(*this, &Init, 1), 5823 &DclT); 5824 if (Result.isInvalid()) { 5825 VDecl->setInvalidDecl(); 5826 return; 5827 } 5828 5829 Init = Result.takeAs<Expr>(); 5830 } 5831 5832 // C++ [class.mem]p4: 5833 // A member-declarator can contain a constant-initializer only 5834 // if it declares a static member (9.4) of const integral or 5835 // const enumeration type, see 9.4.2. 5836 // 5837 // C++0x [class.static.data]p3: 5838 // If a non-volatile const static data member is of integral or 5839 // enumeration type, its declaration in the class definition can 5840 // specify a brace-or-equal-initializer in which every initalizer-clause 5841 // that is an assignment-expression is a constant expression. A static 5842 // data member of literal type can be declared in the class definition 5843 // with the constexpr specifier; if so, its declaration shall specify a 5844 // brace-or-equal-initializer in which every initializer-clause that is 5845 // an assignment-expression is a constant expression. 5846 QualType T = VDecl->getType(); 5847 5848 // Do nothing on dependent types. 5849 if (T->isDependentType()) { 5850 5851 // Allow any 'static constexpr' members, whether or not they are of literal 5852 // type. We separately check that the initializer is a constant expression, 5853 // which implicitly requires the member to be of literal type. 5854 } else if (VDecl->isConstexpr()) { 5855 5856 // Require constness. 5857 } else if (!T.isConstQualified()) { 5858 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5859 << Init->getSourceRange(); 5860 VDecl->setInvalidDecl(); 5861 5862 // We allow integer constant expressions in all cases. 5863 } else if (T->isIntegralOrEnumerationType()) { 5864 // Check whether the expression is a constant expression. 5865 SourceLocation Loc; 5866 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 5867 // In C++0x, a non-constexpr const static data member with an 5868 // in-class initializer cannot be volatile. 5869 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 5870 else if (Init->isValueDependent()) 5871 ; // Nothing to check. 5872 else if (Init->isIntegerConstantExpr(Context, &Loc)) 5873 ; // Ok, it's an ICE! 5874 else if (Init->isEvaluatable(Context)) { 5875 // If we can constant fold the initializer through heroics, accept it, 5876 // but report this as a use of an extension for -pedantic. 5877 Diag(Loc, diag::ext_in_class_initializer_non_constant) 5878 << Init->getSourceRange(); 5879 } else { 5880 // Otherwise, this is some crazy unknown case. Report the issue at the 5881 // location provided by the isIntegerConstantExpr failed check. 5882 Diag(Loc, diag::err_in_class_initializer_non_constant) 5883 << Init->getSourceRange(); 5884 VDecl->setInvalidDecl(); 5885 } 5886 5887 // We allow floating-point constants as an extension. 5888 } else if (T->isFloatingType()) { // also permits complex, which is ok 5889 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5890 << T << Init->getSourceRange(); 5891 if (getLangOptions().CPlusPlus0x) 5892 Diag(VDecl->getLocation(), 5893 diag::note_in_class_initializer_float_type_constexpr) 5894 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 5895 5896 if (!Init->isValueDependent() && 5897 !Init->isConstantInitializer(Context, false)) { 5898 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5899 << Init->getSourceRange(); 5900 VDecl->setInvalidDecl(); 5901 } 5902 5903 // Suggest adding 'constexpr' in C++0x for literal types. 5904 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 5905 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 5906 << T << Init->getSourceRange() 5907 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 5908 VDecl->setConstexpr(true); 5909 5910 } else { 5911 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5912 << T << Init->getSourceRange(); 5913 VDecl->setInvalidDecl(); 5914 } 5915 } else if (VDecl->isFileVarDecl()) { 5916 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5917 (!getLangOptions().CPlusPlus || 5918 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5919 Diag(VDecl->getLocation(), diag::warn_extern_init); 5920 if (!VDecl->isInvalidDecl()) { 5921 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5922 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5923 MultiExprArg(*this, &Init, 1), 5924 &DclT); 5925 if (Result.isInvalid()) { 5926 VDecl->setInvalidDecl(); 5927 return; 5928 } 5929 5930 Init = Result.takeAs<Expr>(); 5931 } 5932 5933 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5934 // Don't check invalid declarations to avoid emitting useless diagnostics. 5935 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5936 // C99 6.7.8p4. All file scoped initializers need to be constant. 5937 CheckForConstantInitializer(Init, DclT); 5938 } 5939 } 5940 // If the type changed, it means we had an incomplete type that was 5941 // completed by the initializer. For example: 5942 // int ary[] = { 1, 3, 5 }; 5943 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5944 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5945 VDecl->setType(DclT); 5946 Init->setType(DclT); 5947 } 5948 5949 // Check any implicit conversions within the expression. 5950 CheckImplicitConversions(Init, VDecl->getLocation()); 5951 5952 if (!VDecl->isInvalidDecl()) 5953 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 5954 5955 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 5956 !VDecl->getType()->isDependentType() && 5957 !Init->isTypeDependent() && !Init->isValueDependent() && 5958 !Init->isConstantInitializer(Context, 5959 VDecl->getType()->isReferenceType())) { 5960 // FIXME: Improve this diagnostic to explain why the initializer is not 5961 // a constant expression. 5962 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 5963 << VDecl << Init->getSourceRange(); 5964 } 5965 5966 Init = MaybeCreateExprWithCleanups(Init); 5967 // Attach the initializer to the decl. 5968 VDecl->setInit(Init); 5969 5970 CheckCompleteVariableDeclaration(VDecl); 5971} 5972 5973/// ActOnInitializerError - Given that there was an error parsing an 5974/// initializer for the given declaration, try to return to some form 5975/// of sanity. 5976void Sema::ActOnInitializerError(Decl *D) { 5977 // Our main concern here is re-establishing invariants like "a 5978 // variable's type is either dependent or complete". 5979 if (!D || D->isInvalidDecl()) return; 5980 5981 VarDecl *VD = dyn_cast<VarDecl>(D); 5982 if (!VD) return; 5983 5984 // Auto types are meaningless if we can't make sense of the initializer. 5985 if (ParsingInitForAutoVars.count(D)) { 5986 D->setInvalidDecl(); 5987 return; 5988 } 5989 5990 QualType Ty = VD->getType(); 5991 if (Ty->isDependentType()) return; 5992 5993 // Require a complete type. 5994 if (RequireCompleteType(VD->getLocation(), 5995 Context.getBaseElementType(Ty), 5996 diag::err_typecheck_decl_incomplete_type)) { 5997 VD->setInvalidDecl(); 5998 return; 5999 } 6000 6001 // Require an abstract type. 6002 if (RequireNonAbstractType(VD->getLocation(), Ty, 6003 diag::err_abstract_type_in_decl, 6004 AbstractVariableType)) { 6005 VD->setInvalidDecl(); 6006 return; 6007 } 6008 6009 // Don't bother complaining about constructors or destructors, 6010 // though. 6011} 6012 6013void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6014 bool TypeMayContainAuto) { 6015 // If there is no declaration, there was an error parsing it. Just ignore it. 6016 if (RealDecl == 0) 6017 return; 6018 6019 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6020 QualType Type = Var->getType(); 6021 6022 // C++0x [dcl.spec.auto]p3 6023 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6024 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6025 << Var->getDeclName() << Type; 6026 Var->setInvalidDecl(); 6027 return; 6028 } 6029 6030 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6031 // have an initializer. 6032 // C++0x [class.static.data]p3: A static data member can be declared with 6033 // the constexpr specifier; if so, its declaration shall specify 6034 // a brace-or-equal-initializer. 6035 // 6036 // A static data member's definition may inherit an initializer from an 6037 // in-class declaration. 6038 if (Var->isConstexpr() && !Var->getAnyInitializer()) { 6039 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6040 << Var->getDeclName(); 6041 Var->setInvalidDecl(); 6042 return; 6043 } 6044 6045 switch (Var->isThisDeclarationADefinition()) { 6046 case VarDecl::Definition: 6047 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6048 break; 6049 6050 // We have an out-of-line definition of a static data member 6051 // that has an in-class initializer, so we type-check this like 6052 // a declaration. 6053 // 6054 // Fall through 6055 6056 case VarDecl::DeclarationOnly: 6057 // It's only a declaration. 6058 6059 // Block scope. C99 6.7p7: If an identifier for an object is 6060 // declared with no linkage (C99 6.2.2p6), the type for the 6061 // object shall be complete. 6062 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6063 !Var->getLinkage() && !Var->isInvalidDecl() && 6064 RequireCompleteType(Var->getLocation(), Type, 6065 diag::err_typecheck_decl_incomplete_type)) 6066 Var->setInvalidDecl(); 6067 6068 // Make sure that the type is not abstract. 6069 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6070 RequireNonAbstractType(Var->getLocation(), Type, 6071 diag::err_abstract_type_in_decl, 6072 AbstractVariableType)) 6073 Var->setInvalidDecl(); 6074 return; 6075 6076 case VarDecl::TentativeDefinition: 6077 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6078 // object that has file scope without an initializer, and without a 6079 // storage-class specifier or with the storage-class specifier "static", 6080 // constitutes a tentative definition. Note: A tentative definition with 6081 // external linkage is valid (C99 6.2.2p5). 6082 if (!Var->isInvalidDecl()) { 6083 if (const IncompleteArrayType *ArrayT 6084 = Context.getAsIncompleteArrayType(Type)) { 6085 if (RequireCompleteType(Var->getLocation(), 6086 ArrayT->getElementType(), 6087 diag::err_illegal_decl_array_incomplete_type)) 6088 Var->setInvalidDecl(); 6089 } else if (Var->getStorageClass() == SC_Static) { 6090 // C99 6.9.2p3: If the declaration of an identifier for an object is 6091 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6092 // declared type shall not be an incomplete type. 6093 // NOTE: code such as the following 6094 // static struct s; 6095 // struct s { int a; }; 6096 // is accepted by gcc. Hence here we issue a warning instead of 6097 // an error and we do not invalidate the static declaration. 6098 // NOTE: to avoid multiple warnings, only check the first declaration. 6099 if (Var->getPreviousDeclaration() == 0) 6100 RequireCompleteType(Var->getLocation(), Type, 6101 diag::ext_typecheck_decl_incomplete_type); 6102 } 6103 } 6104 6105 // Record the tentative definition; we're done. 6106 if (!Var->isInvalidDecl()) 6107 TentativeDefinitions.push_back(Var); 6108 return; 6109 } 6110 6111 // Provide a specific diagnostic for uninitialized variable 6112 // definitions with incomplete array type. 6113 if (Type->isIncompleteArrayType()) { 6114 Diag(Var->getLocation(), 6115 diag::err_typecheck_incomplete_array_needs_initializer); 6116 Var->setInvalidDecl(); 6117 return; 6118 } 6119 6120 // Provide a specific diagnostic for uninitialized variable 6121 // definitions with reference type. 6122 if (Type->isReferenceType()) { 6123 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6124 << Var->getDeclName() 6125 << SourceRange(Var->getLocation(), Var->getLocation()); 6126 Var->setInvalidDecl(); 6127 return; 6128 } 6129 6130 // Do not attempt to type-check the default initializer for a 6131 // variable with dependent type. 6132 if (Type->isDependentType()) 6133 return; 6134 6135 if (Var->isInvalidDecl()) 6136 return; 6137 6138 if (RequireCompleteType(Var->getLocation(), 6139 Context.getBaseElementType(Type), 6140 diag::err_typecheck_decl_incomplete_type)) { 6141 Var->setInvalidDecl(); 6142 return; 6143 } 6144 6145 // The variable can not have an abstract class type. 6146 if (RequireNonAbstractType(Var->getLocation(), Type, 6147 diag::err_abstract_type_in_decl, 6148 AbstractVariableType)) { 6149 Var->setInvalidDecl(); 6150 return; 6151 } 6152 6153 // Check for jumps past the implicit initializer. C++0x 6154 // clarifies that this applies to a "variable with automatic 6155 // storage duration", not a "local variable". 6156 // C++0x [stmt.dcl]p3 6157 // A program that jumps from a point where a variable with automatic 6158 // storage duration is not in scope to a point where it is in scope is 6159 // ill-formed unless the variable has scalar type, class type with a 6160 // trivial default constructor and a trivial destructor, a cv-qualified 6161 // version of one of these types, or an array of one of the preceding 6162 // types and is declared without an initializer. 6163 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6164 if (const RecordType *Record 6165 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6166 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6167 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 6168 (getLangOptions().CPlusPlus0x && 6169 (!CXXRecord->hasTrivialDefaultConstructor() || 6170 !CXXRecord->hasTrivialDestructor()))) 6171 getCurFunction()->setHasBranchProtectedScope(); 6172 } 6173 } 6174 6175 // C++03 [dcl.init]p9: 6176 // If no initializer is specified for an object, and the 6177 // object is of (possibly cv-qualified) non-POD class type (or 6178 // array thereof), the object shall be default-initialized; if 6179 // the object is of const-qualified type, the underlying class 6180 // type shall have a user-declared default 6181 // constructor. Otherwise, if no initializer is specified for 6182 // a non- static object, the object and its subobjects, if 6183 // any, have an indeterminate initial value); if the object 6184 // or any of its subobjects are of const-qualified type, the 6185 // program is ill-formed. 6186 // C++0x [dcl.init]p11: 6187 // If no initializer is specified for an object, the object is 6188 // default-initialized; [...]. 6189 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6190 InitializationKind Kind 6191 = InitializationKind::CreateDefault(Var->getLocation()); 6192 6193 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6194 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6195 MultiExprArg(*this, 0, 0)); 6196 if (Init.isInvalid()) 6197 Var->setInvalidDecl(); 6198 else if (Init.get()) 6199 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6200 6201 CheckCompleteVariableDeclaration(Var); 6202 } 6203} 6204 6205void Sema::ActOnCXXForRangeDecl(Decl *D) { 6206 VarDecl *VD = dyn_cast<VarDecl>(D); 6207 if (!VD) { 6208 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6209 D->setInvalidDecl(); 6210 return; 6211 } 6212 6213 VD->setCXXForRangeDecl(true); 6214 6215 // for-range-declaration cannot be given a storage class specifier. 6216 int Error = -1; 6217 switch (VD->getStorageClassAsWritten()) { 6218 case SC_None: 6219 break; 6220 case SC_Extern: 6221 Error = 0; 6222 break; 6223 case SC_Static: 6224 Error = 1; 6225 break; 6226 case SC_PrivateExtern: 6227 Error = 2; 6228 break; 6229 case SC_Auto: 6230 Error = 3; 6231 break; 6232 case SC_Register: 6233 Error = 4; 6234 break; 6235 case SC_OpenCLWorkGroupLocal: 6236 llvm_unreachable("Unexpected storage class"); 6237 } 6238 if (VD->isConstexpr()) 6239 Error = 5; 6240 if (Error != -1) { 6241 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6242 << VD->getDeclName() << Error; 6243 D->setInvalidDecl(); 6244 } 6245} 6246 6247void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6248 if (var->isInvalidDecl()) return; 6249 6250 // In ARC, don't allow jumps past the implicit initialization of a 6251 // local retaining variable. 6252 if (getLangOptions().ObjCAutoRefCount && 6253 var->hasLocalStorage()) { 6254 switch (var->getType().getObjCLifetime()) { 6255 case Qualifiers::OCL_None: 6256 case Qualifiers::OCL_ExplicitNone: 6257 case Qualifiers::OCL_Autoreleasing: 6258 break; 6259 6260 case Qualifiers::OCL_Weak: 6261 case Qualifiers::OCL_Strong: 6262 getCurFunction()->setHasBranchProtectedScope(); 6263 break; 6264 } 6265 } 6266 6267 // All the following checks are C++ only. 6268 if (!getLangOptions().CPlusPlus) return; 6269 6270 QualType baseType = Context.getBaseElementType(var->getType()); 6271 if (baseType->isDependentType()) return; 6272 6273 // __block variables might require us to capture a copy-initializer. 6274 if (var->hasAttr<BlocksAttr>()) { 6275 // It's currently invalid to ever have a __block variable with an 6276 // array type; should we diagnose that here? 6277 6278 // Regardless, we don't want to ignore array nesting when 6279 // constructing this copy. 6280 QualType type = var->getType(); 6281 6282 if (type->isStructureOrClassType()) { 6283 SourceLocation poi = var->getLocation(); 6284 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6285 ExprResult result = 6286 PerformCopyInitialization( 6287 InitializedEntity::InitializeBlock(poi, type, false), 6288 poi, Owned(varRef)); 6289 if (!result.isInvalid()) { 6290 result = MaybeCreateExprWithCleanups(result); 6291 Expr *init = result.takeAs<Expr>(); 6292 Context.setBlockVarCopyInits(var, init); 6293 } 6294 } 6295 } 6296 6297 // Check for global constructors. 6298 if (!var->getDeclContext()->isDependentContext() && 6299 var->hasGlobalStorage() && 6300 !var->isStaticLocal() && 6301 var->getInit() && 6302 !var->getInit()->isConstantInitializer(Context, 6303 baseType->isReferenceType())) 6304 Diag(var->getLocation(), diag::warn_global_constructor) 6305 << var->getInit()->getSourceRange(); 6306 6307 // Require the destructor. 6308 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6309 FinalizeVarWithDestructor(var, recordType); 6310} 6311 6312/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6313/// any semantic actions necessary after any initializer has been attached. 6314void 6315Sema::FinalizeDeclaration(Decl *ThisDecl) { 6316 // Note that we are no longer parsing the initializer for this declaration. 6317 ParsingInitForAutoVars.erase(ThisDecl); 6318} 6319 6320Sema::DeclGroupPtrTy 6321Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6322 Decl **Group, unsigned NumDecls) { 6323 SmallVector<Decl*, 8> Decls; 6324 6325 if (DS.isTypeSpecOwned()) 6326 Decls.push_back(DS.getRepAsDecl()); 6327 6328 for (unsigned i = 0; i != NumDecls; ++i) 6329 if (Decl *D = Group[i]) 6330 Decls.push_back(D); 6331 6332 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6333 DS.getTypeSpecType() == DeclSpec::TST_auto); 6334} 6335 6336/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6337/// group, performing any necessary semantic checking. 6338Sema::DeclGroupPtrTy 6339Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6340 bool TypeMayContainAuto) { 6341 // C++0x [dcl.spec.auto]p7: 6342 // If the type deduced for the template parameter U is not the same in each 6343 // deduction, the program is ill-formed. 6344 // FIXME: When initializer-list support is added, a distinction is needed 6345 // between the deduced type U and the deduced type which 'auto' stands for. 6346 // auto a = 0, b = { 1, 2, 3 }; 6347 // is legal because the deduced type U is 'int' in both cases. 6348 if (TypeMayContainAuto && NumDecls > 1) { 6349 QualType Deduced; 6350 CanQualType DeducedCanon; 6351 VarDecl *DeducedDecl = 0; 6352 for (unsigned i = 0; i != NumDecls; ++i) { 6353 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6354 AutoType *AT = D->getType()->getContainedAutoType(); 6355 // Don't reissue diagnostics when instantiating a template. 6356 if (AT && D->isInvalidDecl()) 6357 break; 6358 if (AT && AT->isDeduced()) { 6359 QualType U = AT->getDeducedType(); 6360 CanQualType UCanon = Context.getCanonicalType(U); 6361 if (Deduced.isNull()) { 6362 Deduced = U; 6363 DeducedCanon = UCanon; 6364 DeducedDecl = D; 6365 } else if (DeducedCanon != UCanon) { 6366 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6367 diag::err_auto_different_deductions) 6368 << Deduced << DeducedDecl->getDeclName() 6369 << U << D->getDeclName() 6370 << DeducedDecl->getInit()->getSourceRange() 6371 << D->getInit()->getSourceRange(); 6372 D->setInvalidDecl(); 6373 break; 6374 } 6375 } 6376 } 6377 } 6378 } 6379 6380 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6381} 6382 6383 6384/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6385/// to introduce parameters into function prototype scope. 6386Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6387 const DeclSpec &DS = D.getDeclSpec(); 6388 6389 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6390 VarDecl::StorageClass StorageClass = SC_None; 6391 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6392 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6393 StorageClass = SC_Register; 6394 StorageClassAsWritten = SC_Register; 6395 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6396 Diag(DS.getStorageClassSpecLoc(), 6397 diag::err_invalid_storage_class_in_func_decl); 6398 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6399 } 6400 6401 if (D.getDeclSpec().isThreadSpecified()) 6402 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6403 if (D.getDeclSpec().isConstexprSpecified()) 6404 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6405 << 0; 6406 6407 DiagnoseFunctionSpecifiers(D); 6408 6409 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6410 QualType parmDeclType = TInfo->getType(); 6411 6412 if (getLangOptions().CPlusPlus) { 6413 // Check that there are no default arguments inside the type of this 6414 // parameter. 6415 CheckExtraCXXDefaultArguments(D); 6416 6417 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6418 if (D.getCXXScopeSpec().isSet()) { 6419 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6420 << D.getCXXScopeSpec().getRange(); 6421 D.getCXXScopeSpec().clear(); 6422 } 6423 } 6424 6425 // Ensure we have a valid name 6426 IdentifierInfo *II = 0; 6427 if (D.hasName()) { 6428 II = D.getIdentifier(); 6429 if (!II) { 6430 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6431 << GetNameForDeclarator(D).getName().getAsString(); 6432 D.setInvalidType(true); 6433 } 6434 } 6435 6436 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6437 if (II) { 6438 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6439 ForRedeclaration); 6440 LookupName(R, S); 6441 if (R.isSingleResult()) { 6442 NamedDecl *PrevDecl = R.getFoundDecl(); 6443 if (PrevDecl->isTemplateParameter()) { 6444 // Maybe we will complain about the shadowed template parameter. 6445 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6446 // Just pretend that we didn't see the previous declaration. 6447 PrevDecl = 0; 6448 } else if (S->isDeclScope(PrevDecl)) { 6449 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6450 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6451 6452 // Recover by removing the name 6453 II = 0; 6454 D.SetIdentifier(0, D.getIdentifierLoc()); 6455 D.setInvalidType(true); 6456 } 6457 } 6458 } 6459 6460 // Temporarily put parameter variables in the translation unit, not 6461 // the enclosing context. This prevents them from accidentally 6462 // looking like class members in C++. 6463 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6464 D.getSourceRange().getBegin(), 6465 D.getIdentifierLoc(), II, 6466 parmDeclType, TInfo, 6467 StorageClass, StorageClassAsWritten); 6468 6469 if (D.isInvalidType()) 6470 New->setInvalidDecl(); 6471 6472 assert(S->isFunctionPrototypeScope()); 6473 assert(S->getFunctionPrototypeDepth() >= 1); 6474 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6475 S->getNextFunctionPrototypeIndex()); 6476 6477 // Add the parameter declaration into this scope. 6478 S->AddDecl(New); 6479 if (II) 6480 IdResolver.AddDecl(New); 6481 6482 ProcessDeclAttributes(S, New, D); 6483 6484 if (D.getDeclSpec().isModulePrivateSpecified()) 6485 Diag(New->getLocation(), diag::err_module_private_local) 6486 << 1 << New->getDeclName() 6487 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6488 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6489 6490 if (New->hasAttr<BlocksAttr>()) { 6491 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6492 } 6493 return New; 6494} 6495 6496/// \brief Synthesizes a variable for a parameter arising from a 6497/// typedef. 6498ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6499 SourceLocation Loc, 6500 QualType T) { 6501 /* FIXME: setting StartLoc == Loc. 6502 Would it be worth to modify callers so as to provide proper source 6503 location for the unnamed parameters, embedding the parameter's type? */ 6504 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6505 T, Context.getTrivialTypeSourceInfo(T, Loc), 6506 SC_None, SC_None, 0); 6507 Param->setImplicit(); 6508 return Param; 6509} 6510 6511void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6512 ParmVarDecl * const *ParamEnd) { 6513 // Don't diagnose unused-parameter errors in template instantiations; we 6514 // will already have done so in the template itself. 6515 if (!ActiveTemplateInstantiations.empty()) 6516 return; 6517 6518 for (; Param != ParamEnd; ++Param) { 6519 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6520 !(*Param)->hasAttr<UnusedAttr>()) { 6521 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6522 << (*Param)->getDeclName(); 6523 } 6524 } 6525} 6526 6527void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6528 ParmVarDecl * const *ParamEnd, 6529 QualType ReturnTy, 6530 NamedDecl *D) { 6531 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6532 return; 6533 6534 // Warn if the return value is pass-by-value and larger than the specified 6535 // threshold. 6536 if (ReturnTy.isPODType(Context)) { 6537 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6538 if (Size > LangOpts.NumLargeByValueCopy) 6539 Diag(D->getLocation(), diag::warn_return_value_size) 6540 << D->getDeclName() << Size; 6541 } 6542 6543 // Warn if any parameter is pass-by-value and larger than the specified 6544 // threshold. 6545 for (; Param != ParamEnd; ++Param) { 6546 QualType T = (*Param)->getType(); 6547 if (!T.isPODType(Context)) 6548 continue; 6549 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6550 if (Size > LangOpts.NumLargeByValueCopy) 6551 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6552 << (*Param)->getDeclName() << Size; 6553 } 6554} 6555 6556ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6557 SourceLocation NameLoc, IdentifierInfo *Name, 6558 QualType T, TypeSourceInfo *TSInfo, 6559 VarDecl::StorageClass StorageClass, 6560 VarDecl::StorageClass StorageClassAsWritten) { 6561 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6562 if (getLangOptions().ObjCAutoRefCount && 6563 T.getObjCLifetime() == Qualifiers::OCL_None && 6564 T->isObjCLifetimeType()) { 6565 6566 Qualifiers::ObjCLifetime lifetime; 6567 6568 // Special cases for arrays: 6569 // - if it's const, use __unsafe_unretained 6570 // - otherwise, it's an error 6571 if (T->isArrayType()) { 6572 if (!T.isConstQualified()) { 6573 DelayedDiagnostics.add( 6574 sema::DelayedDiagnostic::makeForbiddenType( 6575 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6576 } 6577 lifetime = Qualifiers::OCL_ExplicitNone; 6578 } else { 6579 lifetime = T->getObjCARCImplicitLifetime(); 6580 } 6581 T = Context.getLifetimeQualifiedType(T, lifetime); 6582 } 6583 6584 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6585 Context.getAdjustedParameterType(T), 6586 TSInfo, 6587 StorageClass, StorageClassAsWritten, 6588 0); 6589 6590 // Parameters can not be abstract class types. 6591 // For record types, this is done by the AbstractClassUsageDiagnoser once 6592 // the class has been completely parsed. 6593 if (!CurContext->isRecord() && 6594 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6595 AbstractParamType)) 6596 New->setInvalidDecl(); 6597 6598 // Parameter declarators cannot be interface types. All ObjC objects are 6599 // passed by reference. 6600 if (T->isObjCObjectType()) { 6601 Diag(NameLoc, 6602 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6603 << FixItHint::CreateInsertion(NameLoc, "*"); 6604 T = Context.getObjCObjectPointerType(T); 6605 New->setType(T); 6606 } 6607 6608 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6609 // duration shall not be qualified by an address-space qualifier." 6610 // Since all parameters have automatic store duration, they can not have 6611 // an address space. 6612 if (T.getAddressSpace() != 0) { 6613 Diag(NameLoc, diag::err_arg_with_address_space); 6614 New->setInvalidDecl(); 6615 } 6616 6617 return New; 6618} 6619 6620void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6621 SourceLocation LocAfterDecls) { 6622 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6623 6624 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6625 // for a K&R function. 6626 if (!FTI.hasPrototype) { 6627 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6628 --i; 6629 if (FTI.ArgInfo[i].Param == 0) { 6630 llvm::SmallString<256> Code; 6631 llvm::raw_svector_ostream(Code) << " int " 6632 << FTI.ArgInfo[i].Ident->getName() 6633 << ";\n"; 6634 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6635 << FTI.ArgInfo[i].Ident 6636 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6637 6638 // Implicitly declare the argument as type 'int' for lack of a better 6639 // type. 6640 AttributeFactory attrs; 6641 DeclSpec DS(attrs); 6642 const char* PrevSpec; // unused 6643 unsigned DiagID; // unused 6644 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6645 PrevSpec, DiagID); 6646 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6647 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6648 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6649 } 6650 } 6651 } 6652} 6653 6654Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6655 Declarator &D) { 6656 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6657 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6658 Scope *ParentScope = FnBodyScope->getParent(); 6659 6660 Decl *DP = HandleDeclarator(ParentScope, D, 6661 MultiTemplateParamsArg(*this), 6662 /*IsFunctionDefinition=*/true); 6663 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6664} 6665 6666static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6667 // Don't warn about invalid declarations. 6668 if (FD->isInvalidDecl()) 6669 return false; 6670 6671 // Or declarations that aren't global. 6672 if (!FD->isGlobal()) 6673 return false; 6674 6675 // Don't warn about C++ member functions. 6676 if (isa<CXXMethodDecl>(FD)) 6677 return false; 6678 6679 // Don't warn about 'main'. 6680 if (FD->isMain()) 6681 return false; 6682 6683 // Don't warn about inline functions. 6684 if (FD->isInlined()) 6685 return false; 6686 6687 // Don't warn about function templates. 6688 if (FD->getDescribedFunctionTemplate()) 6689 return false; 6690 6691 // Don't warn about function template specializations. 6692 if (FD->isFunctionTemplateSpecialization()) 6693 return false; 6694 6695 bool MissingPrototype = true; 6696 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6697 Prev; Prev = Prev->getPreviousDeclaration()) { 6698 // Ignore any declarations that occur in function or method 6699 // scope, because they aren't visible from the header. 6700 if (Prev->getDeclContext()->isFunctionOrMethod()) 6701 continue; 6702 6703 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6704 break; 6705 } 6706 6707 return MissingPrototype; 6708} 6709 6710void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6711 // Don't complain if we're in GNU89 mode and the previous definition 6712 // was an extern inline function. 6713 const FunctionDecl *Definition; 6714 if (FD->isDefined(Definition) && 6715 !canRedefineFunction(Definition, getLangOptions())) { 6716 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6717 Definition->getStorageClass() == SC_Extern) 6718 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6719 << FD->getDeclName() << getLangOptions().CPlusPlus; 6720 else 6721 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6722 Diag(Definition->getLocation(), diag::note_previous_definition); 6723 } 6724} 6725 6726Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6727 // Clear the last template instantiation error context. 6728 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6729 6730 if (!D) 6731 return D; 6732 FunctionDecl *FD = 0; 6733 6734 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6735 FD = FunTmpl->getTemplatedDecl(); 6736 else 6737 FD = cast<FunctionDecl>(D); 6738 6739 // Enter a new function scope 6740 PushFunctionScope(); 6741 6742 // See if this is a redefinition. 6743 if (!FD->isLateTemplateParsed()) 6744 CheckForFunctionRedefinition(FD); 6745 6746 // Builtin functions cannot be defined. 6747 if (unsigned BuiltinID = FD->getBuiltinID()) { 6748 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6749 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6750 FD->setInvalidDecl(); 6751 } 6752 } 6753 6754 // The return type of a function definition must be complete 6755 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6756 QualType ResultType = FD->getResultType(); 6757 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6758 !FD->isInvalidDecl() && 6759 RequireCompleteType(FD->getLocation(), ResultType, 6760 diag::err_func_def_incomplete_result)) 6761 FD->setInvalidDecl(); 6762 6763 // GNU warning -Wmissing-prototypes: 6764 // Warn if a global function is defined without a previous 6765 // prototype declaration. This warning is issued even if the 6766 // definition itself provides a prototype. The aim is to detect 6767 // global functions that fail to be declared in header files. 6768 if (ShouldWarnAboutMissingPrototype(FD)) 6769 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6770 6771 if (FnBodyScope) 6772 PushDeclContext(FnBodyScope, FD); 6773 6774 // Check the validity of our function parameters 6775 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6776 /*CheckParameterNames=*/true); 6777 6778 // Introduce our parameters into the function scope 6779 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6780 ParmVarDecl *Param = FD->getParamDecl(p); 6781 Param->setOwningFunction(FD); 6782 6783 // If this has an identifier, add it to the scope stack. 6784 if (Param->getIdentifier() && FnBodyScope) { 6785 CheckShadow(FnBodyScope, Param); 6786 6787 PushOnScopeChains(Param, FnBodyScope); 6788 } 6789 } 6790 6791 // Checking attributes of current function definition 6792 // dllimport attribute. 6793 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6794 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6795 // dllimport attribute cannot be directly applied to definition. 6796 // Microsoft accepts dllimport for functions defined within class scope. 6797 if (!DA->isInherited() && 6798 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 6799 Diag(FD->getLocation(), 6800 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6801 << "dllimport"; 6802 FD->setInvalidDecl(); 6803 return FD; 6804 } 6805 6806 // Visual C++ appears to not think this is an issue, so only issue 6807 // a warning when Microsoft extensions are disabled. 6808 if (!LangOpts.MicrosoftExt) { 6809 // If a symbol previously declared dllimport is later defined, the 6810 // attribute is ignored in subsequent references, and a warning is 6811 // emitted. 6812 Diag(FD->getLocation(), 6813 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6814 << FD->getName() << "dllimport"; 6815 } 6816 } 6817 return FD; 6818} 6819 6820/// \brief Given the set of return statements within a function body, 6821/// compute the variables that are subject to the named return value 6822/// optimization. 6823/// 6824/// Each of the variables that is subject to the named return value 6825/// optimization will be marked as NRVO variables in the AST, and any 6826/// return statement that has a marked NRVO variable as its NRVO candidate can 6827/// use the named return value optimization. 6828/// 6829/// This function applies a very simplistic algorithm for NRVO: if every return 6830/// statement in the function has the same NRVO candidate, that candidate is 6831/// the NRVO variable. 6832/// 6833/// FIXME: Employ a smarter algorithm that accounts for multiple return 6834/// statements and the lifetimes of the NRVO candidates. We should be able to 6835/// find a maximal set of NRVO variables. 6836void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6837 ReturnStmt **Returns = Scope->Returns.data(); 6838 6839 const VarDecl *NRVOCandidate = 0; 6840 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6841 if (!Returns[I]->getNRVOCandidate()) 6842 return; 6843 6844 if (!NRVOCandidate) 6845 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6846 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6847 return; 6848 } 6849 6850 if (NRVOCandidate) 6851 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6852} 6853 6854Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6855 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6856} 6857 6858Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6859 bool IsInstantiation) { 6860 FunctionDecl *FD = 0; 6861 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6862 if (FunTmpl) 6863 FD = FunTmpl->getTemplatedDecl(); 6864 else 6865 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6866 6867 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6868 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6869 6870 if (FD) { 6871 FD->setBody(Body); 6872 if (FD->isMain()) { 6873 // C and C++ allow for main to automagically return 0. 6874 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6875 FD->setHasImplicitReturnZero(true); 6876 WP.disableCheckFallThrough(); 6877 } else if (FD->hasAttr<NakedAttr>()) { 6878 // If the function is marked 'naked', don't complain about missing return 6879 // statements. 6880 WP.disableCheckFallThrough(); 6881 } 6882 6883 // MSVC permits the use of pure specifier (=0) on function definition, 6884 // defined at class scope, warn about this non standard construct. 6885 if (getLangOptions().MicrosoftExt && FD->isPure()) 6886 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6887 6888 if (!FD->isInvalidDecl()) { 6889 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6890 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6891 FD->getResultType(), FD); 6892 6893 // If this is a constructor, we need a vtable. 6894 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6895 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6896 6897 computeNRVO(Body, getCurFunction()); 6898 } 6899 6900 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6901 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6902 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6903 MD->setBody(Body); 6904 if (Body) 6905 MD->setEndLoc(Body->getLocEnd()); 6906 if (!MD->isInvalidDecl()) { 6907 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6908 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6909 MD->getResultType(), MD); 6910 6911 if (Body) 6912 computeNRVO(Body, getCurFunction()); 6913 } 6914 if (ObjCShouldCallSuperDealloc) { 6915 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 6916 ObjCShouldCallSuperDealloc = false; 6917 } 6918 if (ObjCShouldCallSuperFinalize) { 6919 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 6920 ObjCShouldCallSuperFinalize = false; 6921 } 6922 } else { 6923 return 0; 6924 } 6925 6926 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 6927 "ObjC methods, which should have been handled in the block above."); 6928 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 6929 "ObjC methods, which should have been handled in the block above."); 6930 6931 // Verify and clean out per-function state. 6932 if (Body) { 6933 // C++ constructors that have function-try-blocks can't have return 6934 // statements in the handlers of that block. (C++ [except.handle]p14) 6935 // Verify this. 6936 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6937 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6938 6939 // Verify that gotos and switch cases don't jump into scopes illegally. 6940 if (getCurFunction()->NeedsScopeChecking() && 6941 !dcl->isInvalidDecl() && 6942 !hasAnyUnrecoverableErrorsInThisFunction()) 6943 DiagnoseInvalidJumps(Body); 6944 6945 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6946 if (!Destructor->getParent()->isDependentType()) 6947 CheckDestructor(Destructor); 6948 6949 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6950 Destructor->getParent()); 6951 } 6952 6953 // If any errors have occurred, clear out any temporaries that may have 6954 // been leftover. This ensures that these temporaries won't be picked up for 6955 // deletion in some later function. 6956 if (PP.getDiagnostics().hasErrorOccurred() || 6957 PP.getDiagnostics().getSuppressAllDiagnostics()) { 6958 ExprTemporaries.clear(); 6959 ExprNeedsCleanups = false; 6960 } else if (!isa<FunctionTemplateDecl>(dcl)) { 6961 // Since the body is valid, issue any analysis-based warnings that are 6962 // enabled. 6963 ActivePolicy = &WP; 6964 } 6965 6966 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 6967 !CheckConstexprFunctionBody(FD, Body)) 6968 FD->setInvalidDecl(); 6969 6970 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6971 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 6972 } 6973 6974 if (!IsInstantiation) 6975 PopDeclContext(); 6976 6977 PopFunctionOrBlockScope(ActivePolicy, dcl); 6978 6979 // If any errors have occurred, clear out any temporaries that may have 6980 // been leftover. This ensures that these temporaries won't be picked up for 6981 // deletion in some later function. 6982 if (getDiagnostics().hasErrorOccurred()) { 6983 ExprTemporaries.clear(); 6984 ExprNeedsCleanups = false; 6985 } 6986 6987 return dcl; 6988} 6989 6990 6991/// When we finish delayed parsing of an attribute, we must attach it to the 6992/// relevant Decl. 6993void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 6994 ParsedAttributes &Attrs) { 6995 ProcessDeclAttributeList(S, D, Attrs.getList()); 6996} 6997 6998 6999/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7000/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7001NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7002 IdentifierInfo &II, Scope *S) { 7003 // Before we produce a declaration for an implicitly defined 7004 // function, see whether there was a locally-scoped declaration of 7005 // this name as a function or variable. If so, use that 7006 // (non-visible) declaration, and complain about it. 7007 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7008 = findLocallyScopedExternalDecl(&II); 7009 if (Pos != LocallyScopedExternalDecls.end()) { 7010 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7011 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7012 return Pos->second; 7013 } 7014 7015 // Extension in C99. Legal in C90, but warn about it. 7016 if (II.getName().startswith("__builtin_")) 7017 Diag(Loc, diag::warn_builtin_unknown) << &II; 7018 else if (getLangOptions().C99) 7019 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7020 else 7021 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7022 7023 // Set a Declarator for the implicit definition: int foo(); 7024 const char *Dummy; 7025 AttributeFactory attrFactory; 7026 DeclSpec DS(attrFactory); 7027 unsigned DiagID; 7028 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7029 (void)Error; // Silence warning. 7030 assert(!Error && "Error setting up implicit decl!"); 7031 Declarator D(DS, Declarator::BlockContext); 7032 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7033 0, 0, true, SourceLocation(), 7034 SourceLocation(), 7035 EST_None, SourceLocation(), 7036 0, 0, 0, 0, Loc, Loc, D), 7037 DS.getAttributes(), 7038 SourceLocation()); 7039 D.SetIdentifier(&II, Loc); 7040 7041 // Insert this function into translation-unit scope. 7042 7043 DeclContext *PrevDC = CurContext; 7044 CurContext = Context.getTranslationUnitDecl(); 7045 7046 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7047 FD->setImplicit(); 7048 7049 CurContext = PrevDC; 7050 7051 AddKnownFunctionAttributes(FD); 7052 7053 return FD; 7054} 7055 7056/// \brief Adds any function attributes that we know a priori based on 7057/// the declaration of this function. 7058/// 7059/// These attributes can apply both to implicitly-declared builtins 7060/// (like __builtin___printf_chk) or to library-declared functions 7061/// like NSLog or printf. 7062/// 7063/// We need to check for duplicate attributes both here and where user-written 7064/// attributes are applied to declarations. 7065void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7066 if (FD->isInvalidDecl()) 7067 return; 7068 7069 // If this is a built-in function, map its builtin attributes to 7070 // actual attributes. 7071 if (unsigned BuiltinID = FD->getBuiltinID()) { 7072 // Handle printf-formatting attributes. 7073 unsigned FormatIdx; 7074 bool HasVAListArg; 7075 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7076 if (!FD->getAttr<FormatAttr>()) 7077 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7078 "printf", FormatIdx+1, 7079 HasVAListArg ? 0 : FormatIdx+2)); 7080 } 7081 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7082 HasVAListArg)) { 7083 if (!FD->getAttr<FormatAttr>()) 7084 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7085 "scanf", FormatIdx+1, 7086 HasVAListArg ? 0 : FormatIdx+2)); 7087 } 7088 7089 // Mark const if we don't care about errno and that is the only 7090 // thing preventing the function from being const. This allows 7091 // IRgen to use LLVM intrinsics for such functions. 7092 if (!getLangOptions().MathErrno && 7093 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7094 if (!FD->getAttr<ConstAttr>()) 7095 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7096 } 7097 7098 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7099 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7100 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7101 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7102 } 7103 7104 IdentifierInfo *Name = FD->getIdentifier(); 7105 if (!Name) 7106 return; 7107 if ((!getLangOptions().CPlusPlus && 7108 FD->getDeclContext()->isTranslationUnit()) || 7109 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7110 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7111 LinkageSpecDecl::lang_c)) { 7112 // Okay: this could be a libc/libm/Objective-C function we know 7113 // about. 7114 } else 7115 return; 7116 7117 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7118 // FIXME: NSLog and NSLogv should be target specific 7119 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7120 // FIXME: We known better than our headers. 7121 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7122 } else 7123 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7124 "printf", 1, 7125 Name->isStr("NSLogv") ? 0 : 2)); 7126 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7127 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7128 // target-specific builtins, perhaps? 7129 if (!FD->getAttr<FormatAttr>()) 7130 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7131 "printf", 2, 7132 Name->isStr("vasprintf") ? 0 : 3)); 7133 } 7134} 7135 7136TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7137 TypeSourceInfo *TInfo) { 7138 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7139 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7140 7141 if (!TInfo) { 7142 assert(D.isInvalidType() && "no declarator info for valid type"); 7143 TInfo = Context.getTrivialTypeSourceInfo(T); 7144 } 7145 7146 // Scope manipulation handled by caller. 7147 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7148 D.getSourceRange().getBegin(), 7149 D.getIdentifierLoc(), 7150 D.getIdentifier(), 7151 TInfo); 7152 7153 // Bail out immediately if we have an invalid declaration. 7154 if (D.isInvalidType()) { 7155 NewTD->setInvalidDecl(); 7156 return NewTD; 7157 } 7158 7159 if (D.getDeclSpec().isModulePrivateSpecified()) { 7160 if (CurContext->isFunctionOrMethod()) 7161 Diag(NewTD->getLocation(), diag::err_module_private_local) 7162 << 2 << NewTD->getDeclName() 7163 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7164 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7165 else 7166 NewTD->setModulePrivate(); 7167 } 7168 7169 // C++ [dcl.typedef]p8: 7170 // If the typedef declaration defines an unnamed class (or 7171 // enum), the first typedef-name declared by the declaration 7172 // to be that class type (or enum type) is used to denote the 7173 // class type (or enum type) for linkage purposes only. 7174 // We need to check whether the type was declared in the declaration. 7175 switch (D.getDeclSpec().getTypeSpecType()) { 7176 case TST_enum: 7177 case TST_struct: 7178 case TST_union: 7179 case TST_class: { 7180 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7181 7182 // Do nothing if the tag is not anonymous or already has an 7183 // associated typedef (from an earlier typedef in this decl group). 7184 if (tagFromDeclSpec->getIdentifier()) break; 7185 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7186 7187 // A well-formed anonymous tag must always be a TUK_Definition. 7188 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7189 7190 // The type must match the tag exactly; no qualifiers allowed. 7191 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7192 break; 7193 7194 // Otherwise, set this is the anon-decl typedef for the tag. 7195 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7196 break; 7197 } 7198 7199 default: 7200 break; 7201 } 7202 7203 return NewTD; 7204} 7205 7206 7207/// \brief Determine whether a tag with a given kind is acceptable 7208/// as a redeclaration of the given tag declaration. 7209/// 7210/// \returns true if the new tag kind is acceptable, false otherwise. 7211bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7212 TagTypeKind NewTag, bool isDefinition, 7213 SourceLocation NewTagLoc, 7214 const IdentifierInfo &Name) { 7215 // C++ [dcl.type.elab]p3: 7216 // The class-key or enum keyword present in the 7217 // elaborated-type-specifier shall agree in kind with the 7218 // declaration to which the name in the elaborated-type-specifier 7219 // refers. This rule also applies to the form of 7220 // elaborated-type-specifier that declares a class-name or 7221 // friend class since it can be construed as referring to the 7222 // definition of the class. Thus, in any 7223 // elaborated-type-specifier, the enum keyword shall be used to 7224 // refer to an enumeration (7.2), the union class-key shall be 7225 // used to refer to a union (clause 9), and either the class or 7226 // struct class-key shall be used to refer to a class (clause 9) 7227 // declared using the class or struct class-key. 7228 TagTypeKind OldTag = Previous->getTagKind(); 7229 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7230 if (OldTag == NewTag) 7231 return true; 7232 7233 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7234 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7235 // Warn about the struct/class tag mismatch. 7236 bool isTemplate = false; 7237 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7238 isTemplate = Record->getDescribedClassTemplate(); 7239 7240 if (!ActiveTemplateInstantiations.empty()) { 7241 // In a template instantiation, do not offer fix-its for tag mismatches 7242 // since they usually mess up the template instead of fixing the problem. 7243 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7244 << (NewTag == TTK_Class) << isTemplate << &Name; 7245 return true; 7246 } 7247 7248 if (isDefinition) { 7249 // On definitions, check previous tags and issue a fix-it for each 7250 // one that doesn't match the current tag. 7251 if (Previous->getDefinition()) { 7252 // Don't suggest fix-its for redefinitions. 7253 return true; 7254 } 7255 7256 bool previousMismatch = false; 7257 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7258 E(Previous->redecls_end()); I != E; ++I) { 7259 if (I->getTagKind() != NewTag) { 7260 if (!previousMismatch) { 7261 previousMismatch = true; 7262 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7263 << (NewTag == TTK_Class) << isTemplate << &Name; 7264 } 7265 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7266 << (NewTag == TTK_Class) 7267 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7268 NewTag == TTK_Class? 7269 "class" : "struct"); 7270 } 7271 } 7272 return true; 7273 } 7274 7275 // Check for a previous definition. If current tag and definition 7276 // are same type, do nothing. If no definition, but disagree with 7277 // with previous tag type, give a warning, but no fix-it. 7278 const TagDecl *Redecl = Previous->getDefinition() ? 7279 Previous->getDefinition() : Previous; 7280 if (Redecl->getTagKind() == NewTag) { 7281 return true; 7282 } 7283 7284 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7285 << (NewTag == TTK_Class) 7286 << isTemplate << &Name; 7287 Diag(Redecl->getLocation(), diag::note_previous_use); 7288 7289 // If there is a previous defintion, suggest a fix-it. 7290 if (Previous->getDefinition()) { 7291 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7292 << (Redecl->getTagKind() == TTK_Class) 7293 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7294 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7295 } 7296 7297 return true; 7298 } 7299 return false; 7300} 7301 7302/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7303/// former case, Name will be non-null. In the later case, Name will be null. 7304/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7305/// reference/declaration/definition of a tag. 7306Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7307 SourceLocation KWLoc, CXXScopeSpec &SS, 7308 IdentifierInfo *Name, SourceLocation NameLoc, 7309 AttributeList *Attr, AccessSpecifier AS, 7310 SourceLocation ModulePrivateLoc, 7311 MultiTemplateParamsArg TemplateParameterLists, 7312 bool &OwnedDecl, bool &IsDependent, 7313 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7314 TypeResult UnderlyingType) { 7315 // If this is not a definition, it must have a name. 7316 assert((Name != 0 || TUK == TUK_Definition) && 7317 "Nameless record must be a definition!"); 7318 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7319 7320 OwnedDecl = false; 7321 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7322 7323 // FIXME: Check explicit specializations more carefully. 7324 bool isExplicitSpecialization = false; 7325 bool Invalid = false; 7326 7327 // We only need to do this matching if we have template parameters 7328 // or a scope specifier, which also conveniently avoids this work 7329 // for non-C++ cases. 7330 if (TemplateParameterLists.size() > 0 || 7331 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7332 if (TemplateParameterList *TemplateParams 7333 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7334 TemplateParameterLists.get(), 7335 TemplateParameterLists.size(), 7336 TUK == TUK_Friend, 7337 isExplicitSpecialization, 7338 Invalid)) { 7339 if (TemplateParams->size() > 0) { 7340 // This is a declaration or definition of a class template (which may 7341 // be a member of another template). 7342 7343 if (Invalid) 7344 return 0; 7345 7346 OwnedDecl = false; 7347 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7348 SS, Name, NameLoc, Attr, 7349 TemplateParams, AS, 7350 ModulePrivateLoc, 7351 TemplateParameterLists.size() - 1, 7352 (TemplateParameterList**) TemplateParameterLists.release()); 7353 return Result.get(); 7354 } else { 7355 // The "template<>" header is extraneous. 7356 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7357 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7358 isExplicitSpecialization = true; 7359 } 7360 } 7361 } 7362 7363 // Figure out the underlying type if this a enum declaration. We need to do 7364 // this early, because it's needed to detect if this is an incompatible 7365 // redeclaration. 7366 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7367 7368 if (Kind == TTK_Enum) { 7369 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7370 // No underlying type explicitly specified, or we failed to parse the 7371 // type, default to int. 7372 EnumUnderlying = Context.IntTy.getTypePtr(); 7373 else if (UnderlyingType.get()) { 7374 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7375 // integral type; any cv-qualification is ignored. 7376 TypeSourceInfo *TI = 0; 7377 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7378 EnumUnderlying = TI; 7379 7380 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7381 7382 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7383 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7384 << T; 7385 // Recover by falling back to int. 7386 EnumUnderlying = Context.IntTy.getTypePtr(); 7387 } 7388 7389 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7390 UPPC_FixedUnderlyingType)) 7391 EnumUnderlying = Context.IntTy.getTypePtr(); 7392 7393 } else if (getLangOptions().MicrosoftExt) 7394 // Microsoft enums are always of int type. 7395 EnumUnderlying = Context.IntTy.getTypePtr(); 7396 } 7397 7398 DeclContext *SearchDC = CurContext; 7399 DeclContext *DC = CurContext; 7400 bool isStdBadAlloc = false; 7401 7402 RedeclarationKind Redecl = ForRedeclaration; 7403 if (TUK == TUK_Friend || TUK == TUK_Reference) 7404 Redecl = NotForRedeclaration; 7405 7406 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7407 7408 if (Name && SS.isNotEmpty()) { 7409 // We have a nested-name tag ('struct foo::bar'). 7410 7411 // Check for invalid 'foo::'. 7412 if (SS.isInvalid()) { 7413 Name = 0; 7414 goto CreateNewDecl; 7415 } 7416 7417 // If this is a friend or a reference to a class in a dependent 7418 // context, don't try to make a decl for it. 7419 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7420 DC = computeDeclContext(SS, false); 7421 if (!DC) { 7422 IsDependent = true; 7423 return 0; 7424 } 7425 } else { 7426 DC = computeDeclContext(SS, true); 7427 if (!DC) { 7428 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7429 << SS.getRange(); 7430 return 0; 7431 } 7432 } 7433 7434 if (RequireCompleteDeclContext(SS, DC)) 7435 return 0; 7436 7437 SearchDC = DC; 7438 // Look-up name inside 'foo::'. 7439 LookupQualifiedName(Previous, DC); 7440 7441 if (Previous.isAmbiguous()) 7442 return 0; 7443 7444 if (Previous.empty()) { 7445 // Name lookup did not find anything. However, if the 7446 // nested-name-specifier refers to the current instantiation, 7447 // and that current instantiation has any dependent base 7448 // classes, we might find something at instantiation time: treat 7449 // this as a dependent elaborated-type-specifier. 7450 // But this only makes any sense for reference-like lookups. 7451 if (Previous.wasNotFoundInCurrentInstantiation() && 7452 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7453 IsDependent = true; 7454 return 0; 7455 } 7456 7457 // A tag 'foo::bar' must already exist. 7458 Diag(NameLoc, diag::err_not_tag_in_scope) 7459 << Kind << Name << DC << SS.getRange(); 7460 Name = 0; 7461 Invalid = true; 7462 goto CreateNewDecl; 7463 } 7464 } else if (Name) { 7465 // If this is a named struct, check to see if there was a previous forward 7466 // declaration or definition. 7467 // FIXME: We're looking into outer scopes here, even when we 7468 // shouldn't be. Doing so can result in ambiguities that we 7469 // shouldn't be diagnosing. 7470 LookupName(Previous, S); 7471 7472 if (Previous.isAmbiguous() && 7473 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7474 LookupResult::Filter F = Previous.makeFilter(); 7475 while (F.hasNext()) { 7476 NamedDecl *ND = F.next(); 7477 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7478 F.erase(); 7479 } 7480 F.done(); 7481 } 7482 7483 // Note: there used to be some attempt at recovery here. 7484 if (Previous.isAmbiguous()) 7485 return 0; 7486 7487 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7488 // FIXME: This makes sure that we ignore the contexts associated 7489 // with C structs, unions, and enums when looking for a matching 7490 // tag declaration or definition. See the similar lookup tweak 7491 // in Sema::LookupName; is there a better way to deal with this? 7492 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7493 SearchDC = SearchDC->getParent(); 7494 } 7495 } else if (S->isFunctionPrototypeScope()) { 7496 // If this is an enum declaration in function prototype scope, set its 7497 // initial context to the translation unit. 7498 SearchDC = Context.getTranslationUnitDecl(); 7499 } 7500 7501 if (Previous.isSingleResult() && 7502 Previous.getFoundDecl()->isTemplateParameter()) { 7503 // Maybe we will complain about the shadowed template parameter. 7504 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7505 // Just pretend that we didn't see the previous declaration. 7506 Previous.clear(); 7507 } 7508 7509 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7510 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7511 // This is a declaration of or a reference to "std::bad_alloc". 7512 isStdBadAlloc = true; 7513 7514 if (Previous.empty() && StdBadAlloc) { 7515 // std::bad_alloc has been implicitly declared (but made invisible to 7516 // name lookup). Fill in this implicit declaration as the previous 7517 // declaration, so that the declarations get chained appropriately. 7518 Previous.addDecl(getStdBadAlloc()); 7519 } 7520 } 7521 7522 // If we didn't find a previous declaration, and this is a reference 7523 // (or friend reference), move to the correct scope. In C++, we 7524 // also need to do a redeclaration lookup there, just in case 7525 // there's a shadow friend decl. 7526 if (Name && Previous.empty() && 7527 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7528 if (Invalid) goto CreateNewDecl; 7529 assert(SS.isEmpty()); 7530 7531 if (TUK == TUK_Reference) { 7532 // C++ [basic.scope.pdecl]p5: 7533 // -- for an elaborated-type-specifier of the form 7534 // 7535 // class-key identifier 7536 // 7537 // if the elaborated-type-specifier is used in the 7538 // decl-specifier-seq or parameter-declaration-clause of a 7539 // function defined in namespace scope, the identifier is 7540 // declared as a class-name in the namespace that contains 7541 // the declaration; otherwise, except as a friend 7542 // declaration, the identifier is declared in the smallest 7543 // non-class, non-function-prototype scope that contains the 7544 // declaration. 7545 // 7546 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7547 // C structs and unions. 7548 // 7549 // It is an error in C++ to declare (rather than define) an enum 7550 // type, including via an elaborated type specifier. We'll 7551 // diagnose that later; for now, declare the enum in the same 7552 // scope as we would have picked for any other tag type. 7553 // 7554 // GNU C also supports this behavior as part of its incomplete 7555 // enum types extension, while GNU C++ does not. 7556 // 7557 // Find the context where we'll be declaring the tag. 7558 // FIXME: We would like to maintain the current DeclContext as the 7559 // lexical context, 7560 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7561 SearchDC = SearchDC->getParent(); 7562 7563 // Find the scope where we'll be declaring the tag. 7564 while (S->isClassScope() || 7565 (getLangOptions().CPlusPlus && 7566 S->isFunctionPrototypeScope()) || 7567 ((S->getFlags() & Scope::DeclScope) == 0) || 7568 (S->getEntity() && 7569 ((DeclContext *)S->getEntity())->isTransparentContext())) 7570 S = S->getParent(); 7571 } else { 7572 assert(TUK == TUK_Friend); 7573 // C++ [namespace.memdef]p3: 7574 // If a friend declaration in a non-local class first declares a 7575 // class or function, the friend class or function is a member of 7576 // the innermost enclosing namespace. 7577 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7578 } 7579 7580 // In C++, we need to do a redeclaration lookup to properly 7581 // diagnose some problems. 7582 if (getLangOptions().CPlusPlus) { 7583 Previous.setRedeclarationKind(ForRedeclaration); 7584 LookupQualifiedName(Previous, SearchDC); 7585 } 7586 } 7587 7588 if (!Previous.empty()) { 7589 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7590 7591 // It's okay to have a tag decl in the same scope as a typedef 7592 // which hides a tag decl in the same scope. Finding this 7593 // insanity with a redeclaration lookup can only actually happen 7594 // in C++. 7595 // 7596 // This is also okay for elaborated-type-specifiers, which is 7597 // technically forbidden by the current standard but which is 7598 // okay according to the likely resolution of an open issue; 7599 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7600 if (getLangOptions().CPlusPlus) { 7601 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7602 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7603 TagDecl *Tag = TT->getDecl(); 7604 if (Tag->getDeclName() == Name && 7605 Tag->getDeclContext()->getRedeclContext() 7606 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7607 PrevDecl = Tag; 7608 Previous.clear(); 7609 Previous.addDecl(Tag); 7610 Previous.resolveKind(); 7611 } 7612 } 7613 } 7614 } 7615 7616 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7617 // If this is a use of a previous tag, or if the tag is already declared 7618 // in the same scope (so that the definition/declaration completes or 7619 // rementions the tag), reuse the decl. 7620 if (TUK == TUK_Reference || TUK == TUK_Friend || 7621 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7622 // Make sure that this wasn't declared as an enum and now used as a 7623 // struct or something similar. 7624 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7625 TUK == TUK_Definition, KWLoc, 7626 *Name)) { 7627 bool SafeToContinue 7628 = (PrevTagDecl->getTagKind() != TTK_Enum && 7629 Kind != TTK_Enum); 7630 if (SafeToContinue) 7631 Diag(KWLoc, diag::err_use_with_wrong_tag) 7632 << Name 7633 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7634 PrevTagDecl->getKindName()); 7635 else 7636 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7637 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7638 7639 if (SafeToContinue) 7640 Kind = PrevTagDecl->getTagKind(); 7641 else { 7642 // Recover by making this an anonymous redefinition. 7643 Name = 0; 7644 Previous.clear(); 7645 Invalid = true; 7646 } 7647 } 7648 7649 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7650 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7651 7652 // All conflicts with previous declarations are recovered by 7653 // returning the previous declaration. 7654 if (ScopedEnum != PrevEnum->isScoped()) { 7655 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7656 << PrevEnum->isScoped(); 7657 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7658 return PrevTagDecl; 7659 } 7660 else if (EnumUnderlying && PrevEnum->isFixed()) { 7661 QualType T; 7662 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7663 T = TI->getType(); 7664 else 7665 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7666 7667 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7668 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7669 diag::err_enum_redeclare_type_mismatch) 7670 << T 7671 << PrevEnum->getIntegerType(); 7672 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7673 return PrevTagDecl; 7674 } 7675 } 7676 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7677 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7678 << PrevEnum->isFixed(); 7679 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7680 return PrevTagDecl; 7681 } 7682 } 7683 7684 if (!Invalid) { 7685 // If this is a use, just return the declaration we found. 7686 7687 // FIXME: In the future, return a variant or some other clue 7688 // for the consumer of this Decl to know it doesn't own it. 7689 // For our current ASTs this shouldn't be a problem, but will 7690 // need to be changed with DeclGroups. 7691 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7692 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7693 return PrevTagDecl; 7694 7695 // Diagnose attempts to redefine a tag. 7696 if (TUK == TUK_Definition) { 7697 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7698 // If we're defining a specialization and the previous definition 7699 // is from an implicit instantiation, don't emit an error 7700 // here; we'll catch this in the general case below. 7701 if (!isExplicitSpecialization || 7702 !isa<CXXRecordDecl>(Def) || 7703 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7704 == TSK_ExplicitSpecialization) { 7705 Diag(NameLoc, diag::err_redefinition) << Name; 7706 Diag(Def->getLocation(), diag::note_previous_definition); 7707 // If this is a redefinition, recover by making this 7708 // struct be anonymous, which will make any later 7709 // references get the previous definition. 7710 Name = 0; 7711 Previous.clear(); 7712 Invalid = true; 7713 } 7714 } else { 7715 // If the type is currently being defined, complain 7716 // about a nested redefinition. 7717 const TagType *Tag 7718 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7719 if (Tag->isBeingDefined()) { 7720 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7721 Diag(PrevTagDecl->getLocation(), 7722 diag::note_previous_definition); 7723 Name = 0; 7724 Previous.clear(); 7725 Invalid = true; 7726 } 7727 } 7728 7729 // Okay, this is definition of a previously declared or referenced 7730 // tag PrevDecl. We're going to create a new Decl for it. 7731 } 7732 } 7733 // If we get here we have (another) forward declaration or we 7734 // have a definition. Just create a new decl. 7735 7736 } else { 7737 // If we get here, this is a definition of a new tag type in a nested 7738 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7739 // new decl/type. We set PrevDecl to NULL so that the entities 7740 // have distinct types. 7741 Previous.clear(); 7742 } 7743 // If we get here, we're going to create a new Decl. If PrevDecl 7744 // is non-NULL, it's a definition of the tag declared by 7745 // PrevDecl. If it's NULL, we have a new definition. 7746 7747 7748 // Otherwise, PrevDecl is not a tag, but was found with tag 7749 // lookup. This is only actually possible in C++, where a few 7750 // things like templates still live in the tag namespace. 7751 } else { 7752 assert(getLangOptions().CPlusPlus); 7753 7754 // Use a better diagnostic if an elaborated-type-specifier 7755 // found the wrong kind of type on the first 7756 // (non-redeclaration) lookup. 7757 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7758 !Previous.isForRedeclaration()) { 7759 unsigned Kind = 0; 7760 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7761 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7762 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7763 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7764 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7765 Invalid = true; 7766 7767 // Otherwise, only diagnose if the declaration is in scope. 7768 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7769 isExplicitSpecialization)) { 7770 // do nothing 7771 7772 // Diagnose implicit declarations introduced by elaborated types. 7773 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7774 unsigned Kind = 0; 7775 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7776 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7777 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7778 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7779 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7780 Invalid = true; 7781 7782 // Otherwise it's a declaration. Call out a particularly common 7783 // case here. 7784 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7785 unsigned Kind = 0; 7786 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7787 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7788 << Name << Kind << TND->getUnderlyingType(); 7789 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7790 Invalid = true; 7791 7792 // Otherwise, diagnose. 7793 } else { 7794 // The tag name clashes with something else in the target scope, 7795 // issue an error and recover by making this tag be anonymous. 7796 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7797 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7798 Name = 0; 7799 Invalid = true; 7800 } 7801 7802 // The existing declaration isn't relevant to us; we're in a 7803 // new scope, so clear out the previous declaration. 7804 Previous.clear(); 7805 } 7806 } 7807 7808CreateNewDecl: 7809 7810 TagDecl *PrevDecl = 0; 7811 if (Previous.isSingleResult()) 7812 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7813 7814 // If there is an identifier, use the location of the identifier as the 7815 // location of the decl, otherwise use the location of the struct/union 7816 // keyword. 7817 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7818 7819 // Otherwise, create a new declaration. If there is a previous 7820 // declaration of the same entity, the two will be linked via 7821 // PrevDecl. 7822 TagDecl *New; 7823 7824 bool IsForwardReference = false; 7825 if (Kind == TTK_Enum) { 7826 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7827 // enum X { A, B, C } D; D should chain to X. 7828 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7829 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7830 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7831 // If this is an undefined enum, warn. 7832 if (TUK != TUK_Definition && !Invalid) { 7833 TagDecl *Def; 7834 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7835 // C++0x: 7.2p2: opaque-enum-declaration. 7836 // Conflicts are diagnosed above. Do nothing. 7837 } 7838 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7839 Diag(Loc, diag::ext_forward_ref_enum_def) 7840 << New; 7841 Diag(Def->getLocation(), diag::note_previous_definition); 7842 } else { 7843 unsigned DiagID = diag::ext_forward_ref_enum; 7844 if (getLangOptions().MicrosoftExt) 7845 DiagID = diag::ext_ms_forward_ref_enum; 7846 else if (getLangOptions().CPlusPlus) 7847 DiagID = diag::err_forward_ref_enum; 7848 Diag(Loc, DiagID); 7849 7850 // If this is a forward-declared reference to an enumeration, make a 7851 // note of it; we won't actually be introducing the declaration into 7852 // the declaration context. 7853 if (TUK == TUK_Reference) 7854 IsForwardReference = true; 7855 } 7856 } 7857 7858 if (EnumUnderlying) { 7859 EnumDecl *ED = cast<EnumDecl>(New); 7860 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7861 ED->setIntegerTypeSourceInfo(TI); 7862 else 7863 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7864 ED->setPromotionType(ED->getIntegerType()); 7865 } 7866 7867 } else { 7868 // struct/union/class 7869 7870 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7871 // struct X { int A; } D; D should chain to X. 7872 if (getLangOptions().CPlusPlus) { 7873 // FIXME: Look for a way to use RecordDecl for simple structs. 7874 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7875 cast_or_null<CXXRecordDecl>(PrevDecl)); 7876 7877 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7878 StdBadAlloc = cast<CXXRecordDecl>(New); 7879 } else 7880 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7881 cast_or_null<RecordDecl>(PrevDecl)); 7882 } 7883 7884 // Maybe add qualifier info. 7885 if (SS.isNotEmpty()) { 7886 if (SS.isSet()) { 7887 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7888 if (TemplateParameterLists.size() > 0) { 7889 New->setTemplateParameterListsInfo(Context, 7890 TemplateParameterLists.size(), 7891 (TemplateParameterList**) TemplateParameterLists.release()); 7892 } 7893 } 7894 else 7895 Invalid = true; 7896 } 7897 7898 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7899 // Add alignment attributes if necessary; these attributes are checked when 7900 // the ASTContext lays out the structure. 7901 // 7902 // It is important for implementing the correct semantics that this 7903 // happen here (in act on tag decl). The #pragma pack stack is 7904 // maintained as a result of parser callbacks which can occur at 7905 // many points during the parsing of a struct declaration (because 7906 // the #pragma tokens are effectively skipped over during the 7907 // parsing of the struct). 7908 AddAlignmentAttributesForRecord(RD); 7909 7910 AddMsStructLayoutForRecord(RD); 7911 } 7912 7913 if (PrevDecl && PrevDecl->isModulePrivate()) 7914 New->setModulePrivate(); 7915 else if (ModulePrivateLoc.isValid()) { 7916 if (isExplicitSpecialization) 7917 Diag(New->getLocation(), diag::err_module_private_specialization) 7918 << 2 7919 << FixItHint::CreateRemoval(ModulePrivateLoc); 7920 else if (PrevDecl && !PrevDecl->isModulePrivate()) 7921 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 7922 // __module_private__ does not apply to local classes. However, we only 7923 // diagnose this as an error when the declaration specifiers are 7924 // freestanding. Here, we just ignore the __module_private__. 7925 // foobar 7926 else if (!SearchDC->isFunctionOrMethod()) 7927 New->setModulePrivate(); 7928 } 7929 7930 // If this is a specialization of a member class (of a class template), 7931 // check the specialization. 7932 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7933 Invalid = true; 7934 7935 if (Invalid) 7936 New->setInvalidDecl(); 7937 7938 if (Attr) 7939 ProcessDeclAttributeList(S, New, Attr); 7940 7941 // If we're declaring or defining a tag in function prototype scope 7942 // in C, note that this type can only be used within the function. 7943 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7944 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7945 7946 // Set the lexical context. If the tag has a C++ scope specifier, the 7947 // lexical context will be different from the semantic context. 7948 New->setLexicalDeclContext(CurContext); 7949 7950 // Mark this as a friend decl if applicable. 7951 // In Microsoft mode, a friend declaration also acts as a forward 7952 // declaration so we always pass true to setObjectOfFriendDecl to make 7953 // the tag name visible. 7954 if (TUK == TUK_Friend) 7955 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 7956 getLangOptions().MicrosoftExt); 7957 7958 // Set the access specifier. 7959 if (!Invalid && SearchDC->isRecord()) 7960 SetMemberAccessSpecifier(New, PrevDecl, AS); 7961 7962 if (TUK == TUK_Definition) 7963 New->startDefinition(); 7964 7965 // If this has an identifier, add it to the scope stack. 7966 if (TUK == TUK_Friend) { 7967 // We might be replacing an existing declaration in the lookup tables; 7968 // if so, borrow its access specifier. 7969 if (PrevDecl) 7970 New->setAccess(PrevDecl->getAccess()); 7971 7972 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7973 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7974 if (Name) // can be null along some error paths 7975 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7976 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7977 } else if (Name) { 7978 S = getNonFieldDeclScope(S); 7979 PushOnScopeChains(New, S, !IsForwardReference); 7980 if (IsForwardReference) 7981 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7982 7983 } else { 7984 CurContext->addDecl(New); 7985 } 7986 7987 // If this is the C FILE type, notify the AST context. 7988 if (IdentifierInfo *II = New->getIdentifier()) 7989 if (!New->isInvalidDecl() && 7990 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7991 II->isStr("FILE")) 7992 Context.setFILEDecl(New); 7993 7994 OwnedDecl = true; 7995 return New; 7996} 7997 7998void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7999 AdjustDeclIfTemplate(TagD); 8000 TagDecl *Tag = cast<TagDecl>(TagD); 8001 8002 // Enter the tag context. 8003 PushDeclContext(S, Tag); 8004} 8005 8006void Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8007 assert(isa<ObjCContainerDecl>(IDecl) && 8008 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8009 DeclContext *OCD = cast<DeclContext>(IDecl); 8010 assert(getContainingDC(OCD) == CurContext && 8011 "The next DeclContext should be lexically contained in the current one."); 8012 CurContext = OCD; 8013} 8014 8015void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8016 SourceLocation FinalLoc, 8017 SourceLocation LBraceLoc) { 8018 AdjustDeclIfTemplate(TagD); 8019 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8020 8021 FieldCollector->StartClass(); 8022 8023 if (!Record->getIdentifier()) 8024 return; 8025 8026 if (FinalLoc.isValid()) 8027 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8028 8029 // C++ [class]p2: 8030 // [...] The class-name is also inserted into the scope of the 8031 // class itself; this is known as the injected-class-name. For 8032 // purposes of access checking, the injected-class-name is treated 8033 // as if it were a public member name. 8034 CXXRecordDecl *InjectedClassName 8035 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8036 Record->getLocStart(), Record->getLocation(), 8037 Record->getIdentifier(), 8038 /*PrevDecl=*/0, 8039 /*DelayTypeCreation=*/true); 8040 Context.getTypeDeclType(InjectedClassName, Record); 8041 InjectedClassName->setImplicit(); 8042 InjectedClassName->setAccess(AS_public); 8043 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8044 InjectedClassName->setDescribedClassTemplate(Template); 8045 PushOnScopeChains(InjectedClassName, S); 8046 assert(InjectedClassName->isInjectedClassName() && 8047 "Broken injected-class-name"); 8048} 8049 8050void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8051 SourceLocation RBraceLoc) { 8052 AdjustDeclIfTemplate(TagD); 8053 TagDecl *Tag = cast<TagDecl>(TagD); 8054 Tag->setRBraceLoc(RBraceLoc); 8055 8056 if (isa<CXXRecordDecl>(Tag)) 8057 FieldCollector->FinishClass(); 8058 8059 // Exit this scope of this tag's definition. 8060 PopDeclContext(); 8061 8062 // Notify the consumer that we've defined a tag. 8063 Consumer.HandleTagDeclDefinition(Tag); 8064} 8065 8066void Sema::ActOnObjCContainerFinishDefinition() { 8067 // Exit this scope of this interface definition. 8068 PopDeclContext(); 8069} 8070 8071void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8072 AdjustDeclIfTemplate(TagD); 8073 TagDecl *Tag = cast<TagDecl>(TagD); 8074 Tag->setInvalidDecl(); 8075 8076 // We're undoing ActOnTagStartDefinition here, not 8077 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8078 // the FieldCollector. 8079 8080 PopDeclContext(); 8081} 8082 8083// Note that FieldName may be null for anonymous bitfields. 8084bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8085 QualType FieldTy, const Expr *BitWidth, 8086 bool *ZeroWidth) { 8087 // Default to true; that shouldn't confuse checks for emptiness 8088 if (ZeroWidth) 8089 *ZeroWidth = true; 8090 8091 // C99 6.7.2.1p4 - verify the field type. 8092 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8093 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8094 // Handle incomplete types with specific error. 8095 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8096 return true; 8097 if (FieldName) 8098 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8099 << FieldName << FieldTy << BitWidth->getSourceRange(); 8100 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8101 << FieldTy << BitWidth->getSourceRange(); 8102 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8103 UPPC_BitFieldWidth)) 8104 return true; 8105 8106 // If the bit-width is type- or value-dependent, don't try to check 8107 // it now. 8108 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8109 return false; 8110 8111 llvm::APSInt Value; 8112 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8113 return true; 8114 8115 if (Value != 0 && ZeroWidth) 8116 *ZeroWidth = false; 8117 8118 // Zero-width bitfield is ok for anonymous field. 8119 if (Value == 0 && FieldName) 8120 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8121 8122 if (Value.isSigned() && Value.isNegative()) { 8123 if (FieldName) 8124 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8125 << FieldName << Value.toString(10); 8126 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8127 << Value.toString(10); 8128 } 8129 8130 if (!FieldTy->isDependentType()) { 8131 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8132 if (Value.getZExtValue() > TypeSize) { 8133 if (!getLangOptions().CPlusPlus) { 8134 if (FieldName) 8135 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8136 << FieldName << (unsigned)Value.getZExtValue() 8137 << (unsigned)TypeSize; 8138 8139 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8140 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8141 } 8142 8143 if (FieldName) 8144 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8145 << FieldName << (unsigned)Value.getZExtValue() 8146 << (unsigned)TypeSize; 8147 else 8148 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8149 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8150 } 8151 } 8152 8153 return false; 8154} 8155 8156/// ActOnField - Each field of a C struct/union is passed into this in order 8157/// to create a FieldDecl object for it. 8158Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8159 Declarator &D, Expr *BitfieldWidth) { 8160 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8161 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8162 /*HasInit=*/false, AS_public); 8163 return Res; 8164} 8165 8166/// HandleField - Analyze a field of a C struct or a C++ data member. 8167/// 8168FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8169 SourceLocation DeclStart, 8170 Declarator &D, Expr *BitWidth, bool HasInit, 8171 AccessSpecifier AS) { 8172 IdentifierInfo *II = D.getIdentifier(); 8173 SourceLocation Loc = DeclStart; 8174 if (II) Loc = D.getIdentifierLoc(); 8175 8176 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8177 QualType T = TInfo->getType(); 8178 if (getLangOptions().CPlusPlus) { 8179 CheckExtraCXXDefaultArguments(D); 8180 8181 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8182 UPPC_DataMemberType)) { 8183 D.setInvalidType(); 8184 T = Context.IntTy; 8185 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8186 } 8187 } 8188 8189 DiagnoseFunctionSpecifiers(D); 8190 8191 if (D.getDeclSpec().isThreadSpecified()) 8192 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8193 if (D.getDeclSpec().isConstexprSpecified()) 8194 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8195 << 2; 8196 8197 // Check to see if this name was declared as a member previously 8198 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8199 LookupName(Previous, S); 8200 assert((Previous.empty() || Previous.isOverloadedResult() || 8201 Previous.isSingleResult()) 8202 && "Lookup of member name should be either overloaded, single or null"); 8203 8204 // If the name is overloaded then get any declaration else get the single result 8205 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 8206 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 8207 8208 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8209 // Maybe we will complain about the shadowed template parameter. 8210 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8211 // Just pretend that we didn't see the previous declaration. 8212 PrevDecl = 0; 8213 } 8214 8215 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8216 PrevDecl = 0; 8217 8218 bool Mutable 8219 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8220 SourceLocation TSSL = D.getSourceRange().getBegin(); 8221 FieldDecl *NewFD 8222 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8223 TSSL, AS, PrevDecl, &D); 8224 8225 if (NewFD->isInvalidDecl()) 8226 Record->setInvalidDecl(); 8227 8228 if (D.getDeclSpec().isModulePrivateSpecified()) 8229 NewFD->setModulePrivate(); 8230 8231 if (NewFD->isInvalidDecl() && PrevDecl) { 8232 // Don't introduce NewFD into scope; there's already something 8233 // with the same name in the same scope. 8234 } else if (II) { 8235 PushOnScopeChains(NewFD, S); 8236 } else 8237 Record->addDecl(NewFD); 8238 8239 return NewFD; 8240} 8241 8242/// \brief Build a new FieldDecl and check its well-formedness. 8243/// 8244/// This routine builds a new FieldDecl given the fields name, type, 8245/// record, etc. \p PrevDecl should refer to any previous declaration 8246/// with the same name and in the same scope as the field to be 8247/// created. 8248/// 8249/// \returns a new FieldDecl. 8250/// 8251/// \todo The Declarator argument is a hack. It will be removed once 8252FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8253 TypeSourceInfo *TInfo, 8254 RecordDecl *Record, SourceLocation Loc, 8255 bool Mutable, Expr *BitWidth, bool HasInit, 8256 SourceLocation TSSL, 8257 AccessSpecifier AS, NamedDecl *PrevDecl, 8258 Declarator *D) { 8259 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8260 bool InvalidDecl = false; 8261 if (D) InvalidDecl = D->isInvalidType(); 8262 8263 // If we receive a broken type, recover by assuming 'int' and 8264 // marking this declaration as invalid. 8265 if (T.isNull()) { 8266 InvalidDecl = true; 8267 T = Context.IntTy; 8268 } 8269 8270 QualType EltTy = Context.getBaseElementType(T); 8271 if (!EltTy->isDependentType() && 8272 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8273 // Fields of incomplete type force their record to be invalid. 8274 Record->setInvalidDecl(); 8275 InvalidDecl = true; 8276 } 8277 8278 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8279 // than a variably modified type. 8280 if (!InvalidDecl && T->isVariablyModifiedType()) { 8281 bool SizeIsNegative; 8282 llvm::APSInt Oversized; 8283 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8284 SizeIsNegative, 8285 Oversized); 8286 if (!FixedTy.isNull()) { 8287 Diag(Loc, diag::warn_illegal_constant_array_size); 8288 T = FixedTy; 8289 } else { 8290 if (SizeIsNegative) 8291 Diag(Loc, diag::err_typecheck_negative_array_size); 8292 else if (Oversized.getBoolValue()) 8293 Diag(Loc, diag::err_array_too_large) 8294 << Oversized.toString(10); 8295 else 8296 Diag(Loc, diag::err_typecheck_field_variable_size); 8297 InvalidDecl = true; 8298 } 8299 } 8300 8301 // Fields can not have abstract class types 8302 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8303 diag::err_abstract_type_in_decl, 8304 AbstractFieldType)) 8305 InvalidDecl = true; 8306 8307 bool ZeroWidth = false; 8308 // If this is declared as a bit-field, check the bit-field. 8309 if (!InvalidDecl && BitWidth && 8310 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8311 InvalidDecl = true; 8312 BitWidth = 0; 8313 ZeroWidth = false; 8314 } 8315 8316 // Check that 'mutable' is consistent with the type of the declaration. 8317 if (!InvalidDecl && Mutable) { 8318 unsigned DiagID = 0; 8319 if (T->isReferenceType()) 8320 DiagID = diag::err_mutable_reference; 8321 else if (T.isConstQualified()) 8322 DiagID = diag::err_mutable_const; 8323 8324 if (DiagID) { 8325 SourceLocation ErrLoc = Loc; 8326 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8327 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8328 Diag(ErrLoc, DiagID); 8329 Mutable = false; 8330 InvalidDecl = true; 8331 } 8332 } 8333 8334 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8335 BitWidth, Mutable, HasInit); 8336 if (InvalidDecl) 8337 NewFD->setInvalidDecl(); 8338 8339 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8340 Diag(Loc, diag::err_duplicate_member) << II; 8341 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8342 NewFD->setInvalidDecl(); 8343 } 8344 8345 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8346 if (Record->isUnion()) { 8347 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8348 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8349 if (RDecl->getDefinition()) { 8350 // C++ [class.union]p1: An object of a class with a non-trivial 8351 // constructor, a non-trivial copy constructor, a non-trivial 8352 // destructor, or a non-trivial copy assignment operator 8353 // cannot be a member of a union, nor can an array of such 8354 // objects. 8355 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 8356 NewFD->setInvalidDecl(); 8357 } 8358 } 8359 8360 // C++ [class.union]p1: If a union contains a member of reference type, 8361 // the program is ill-formed. 8362 if (EltTy->isReferenceType()) { 8363 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8364 << NewFD->getDeclName() << EltTy; 8365 NewFD->setInvalidDecl(); 8366 } 8367 } 8368 } 8369 8370 // FIXME: We need to pass in the attributes given an AST 8371 // representation, not a parser representation. 8372 if (D) 8373 // FIXME: What to pass instead of TUScope? 8374 ProcessDeclAttributes(TUScope, NewFD, *D); 8375 8376 // In auto-retain/release, infer strong retension for fields of 8377 // retainable type. 8378 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8379 NewFD->setInvalidDecl(); 8380 8381 if (T.isObjCGCWeak()) 8382 Diag(Loc, diag::warn_attribute_weak_on_field); 8383 8384 NewFD->setAccess(AS); 8385 return NewFD; 8386} 8387 8388bool Sema::CheckNontrivialField(FieldDecl *FD) { 8389 assert(FD); 8390 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8391 8392 if (FD->isInvalidDecl()) 8393 return true; 8394 8395 QualType EltTy = Context.getBaseElementType(FD->getType()); 8396 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8397 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8398 if (RDecl->getDefinition()) { 8399 // We check for copy constructors before constructors 8400 // because otherwise we'll never get complaints about 8401 // copy constructors. 8402 8403 CXXSpecialMember member = CXXInvalid; 8404 if (!RDecl->hasTrivialCopyConstructor()) 8405 member = CXXCopyConstructor; 8406 else if (!RDecl->hasTrivialDefaultConstructor()) 8407 member = CXXDefaultConstructor; 8408 else if (!RDecl->hasTrivialCopyAssignment()) 8409 member = CXXCopyAssignment; 8410 else if (!RDecl->hasTrivialDestructor()) 8411 member = CXXDestructor; 8412 8413 if (member != CXXInvalid) { 8414 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8415 // Objective-C++ ARC: it is an error to have a non-trivial field of 8416 // a union. However, system headers in Objective-C programs 8417 // occasionally have Objective-C lifetime objects within unions, 8418 // and rather than cause the program to fail, we make those 8419 // members unavailable. 8420 SourceLocation Loc = FD->getLocation(); 8421 if (getSourceManager().isInSystemHeader(Loc)) { 8422 if (!FD->hasAttr<UnavailableAttr>()) 8423 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8424 "this system field has retaining ownership")); 8425 return false; 8426 } 8427 } 8428 8429 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 8430 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8431 DiagnoseNontrivial(RT, member); 8432 return true; 8433 } 8434 } 8435 } 8436 8437 return false; 8438} 8439 8440/// DiagnoseNontrivial - Given that a class has a non-trivial 8441/// special member, figure out why. 8442void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8443 QualType QT(T, 0U); 8444 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8445 8446 // Check whether the member was user-declared. 8447 switch (member) { 8448 case CXXInvalid: 8449 break; 8450 8451 case CXXDefaultConstructor: 8452 if (RD->hasUserDeclaredConstructor()) { 8453 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8454 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8455 const FunctionDecl *body = 0; 8456 ci->hasBody(body); 8457 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8458 SourceLocation CtorLoc = ci->getLocation(); 8459 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8460 return; 8461 } 8462 } 8463 8464 llvm_unreachable("found no user-declared constructors"); 8465 } 8466 break; 8467 8468 case CXXCopyConstructor: 8469 if (RD->hasUserDeclaredCopyConstructor()) { 8470 SourceLocation CtorLoc = 8471 RD->getCopyConstructor(0)->getLocation(); 8472 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8473 return; 8474 } 8475 break; 8476 8477 case CXXMoveConstructor: 8478 if (RD->hasUserDeclaredMoveConstructor()) { 8479 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8480 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8481 return; 8482 } 8483 break; 8484 8485 case CXXCopyAssignment: 8486 if (RD->hasUserDeclaredCopyAssignment()) { 8487 // FIXME: this should use the location of the copy 8488 // assignment, not the type. 8489 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8490 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8491 return; 8492 } 8493 break; 8494 8495 case CXXMoveAssignment: 8496 if (RD->hasUserDeclaredMoveAssignment()) { 8497 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8498 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8499 return; 8500 } 8501 break; 8502 8503 case CXXDestructor: 8504 if (RD->hasUserDeclaredDestructor()) { 8505 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8506 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8507 return; 8508 } 8509 break; 8510 } 8511 8512 typedef CXXRecordDecl::base_class_iterator base_iter; 8513 8514 // Virtual bases and members inhibit trivial copying/construction, 8515 // but not trivial destruction. 8516 if (member != CXXDestructor) { 8517 // Check for virtual bases. vbases includes indirect virtual bases, 8518 // so we just iterate through the direct bases. 8519 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8520 if (bi->isVirtual()) { 8521 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8522 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8523 return; 8524 } 8525 8526 // Check for virtual methods. 8527 typedef CXXRecordDecl::method_iterator meth_iter; 8528 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8529 ++mi) { 8530 if (mi->isVirtual()) { 8531 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8532 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8533 return; 8534 } 8535 } 8536 } 8537 8538 bool (CXXRecordDecl::*hasTrivial)() const; 8539 switch (member) { 8540 case CXXDefaultConstructor: 8541 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8542 case CXXCopyConstructor: 8543 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8544 case CXXCopyAssignment: 8545 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8546 case CXXDestructor: 8547 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8548 default: 8549 llvm_unreachable("unexpected special member"); 8550 } 8551 8552 // Check for nontrivial bases (and recurse). 8553 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8554 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8555 assert(BaseRT && "Don't know how to handle dependent bases"); 8556 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8557 if (!(BaseRecTy->*hasTrivial)()) { 8558 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8559 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8560 DiagnoseNontrivial(BaseRT, member); 8561 return; 8562 } 8563 } 8564 8565 // Check for nontrivial members (and recurse). 8566 typedef RecordDecl::field_iterator field_iter; 8567 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8568 ++fi) { 8569 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8570 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8571 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8572 8573 if (!(EltRD->*hasTrivial)()) { 8574 SourceLocation FLoc = (*fi)->getLocation(); 8575 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8576 DiagnoseNontrivial(EltRT, member); 8577 return; 8578 } 8579 } 8580 8581 if (EltTy->isObjCLifetimeType()) { 8582 switch (EltTy.getObjCLifetime()) { 8583 case Qualifiers::OCL_None: 8584 case Qualifiers::OCL_ExplicitNone: 8585 break; 8586 8587 case Qualifiers::OCL_Autoreleasing: 8588 case Qualifiers::OCL_Weak: 8589 case Qualifiers::OCL_Strong: 8590 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8591 << QT << EltTy.getObjCLifetime(); 8592 return; 8593 } 8594 } 8595 } 8596 8597 llvm_unreachable("found no explanation for non-trivial member"); 8598} 8599 8600/// TranslateIvarVisibility - Translate visibility from a token ID to an 8601/// AST enum value. 8602static ObjCIvarDecl::AccessControl 8603TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8604 switch (ivarVisibility) { 8605 default: llvm_unreachable("Unknown visitibility kind"); 8606 case tok::objc_private: return ObjCIvarDecl::Private; 8607 case tok::objc_public: return ObjCIvarDecl::Public; 8608 case tok::objc_protected: return ObjCIvarDecl::Protected; 8609 case tok::objc_package: return ObjCIvarDecl::Package; 8610 } 8611} 8612 8613/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8614/// in order to create an IvarDecl object for it. 8615Decl *Sema::ActOnIvar(Scope *S, 8616 SourceLocation DeclStart, 8617 Declarator &D, Expr *BitfieldWidth, 8618 tok::ObjCKeywordKind Visibility) { 8619 8620 IdentifierInfo *II = D.getIdentifier(); 8621 Expr *BitWidth = (Expr*)BitfieldWidth; 8622 SourceLocation Loc = DeclStart; 8623 if (II) Loc = D.getIdentifierLoc(); 8624 8625 // FIXME: Unnamed fields can be handled in various different ways, for 8626 // example, unnamed unions inject all members into the struct namespace! 8627 8628 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8629 QualType T = TInfo->getType(); 8630 8631 if (BitWidth) { 8632 // 6.7.2.1p3, 6.7.2.1p4 8633 if (VerifyBitField(Loc, II, T, BitWidth)) { 8634 D.setInvalidType(); 8635 BitWidth = 0; 8636 } 8637 } else { 8638 // Not a bitfield. 8639 8640 // validate II. 8641 8642 } 8643 if (T->isReferenceType()) { 8644 Diag(Loc, diag::err_ivar_reference_type); 8645 D.setInvalidType(); 8646 } 8647 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8648 // than a variably modified type. 8649 else if (T->isVariablyModifiedType()) { 8650 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8651 D.setInvalidType(); 8652 } 8653 8654 // Get the visibility (access control) for this ivar. 8655 ObjCIvarDecl::AccessControl ac = 8656 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8657 : ObjCIvarDecl::None; 8658 // Must set ivar's DeclContext to its enclosing interface. 8659 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8660 ObjCContainerDecl *EnclosingContext; 8661 if (ObjCImplementationDecl *IMPDecl = 8662 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8663 if (!LangOpts.ObjCNonFragileABI2) { 8664 // Case of ivar declared in an implementation. Context is that of its class. 8665 EnclosingContext = IMPDecl->getClassInterface(); 8666 assert(EnclosingContext && "Implementation has no class interface!"); 8667 } 8668 else 8669 EnclosingContext = EnclosingDecl; 8670 } else { 8671 if (ObjCCategoryDecl *CDecl = 8672 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8673 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8674 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8675 return 0; 8676 } 8677 } 8678 EnclosingContext = EnclosingDecl; 8679 } 8680 8681 // Construct the decl. 8682 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8683 DeclStart, Loc, II, T, 8684 TInfo, ac, (Expr *)BitfieldWidth); 8685 8686 if (II) { 8687 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8688 ForRedeclaration); 8689 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8690 && !isa<TagDecl>(PrevDecl)) { 8691 Diag(Loc, diag::err_duplicate_member) << II; 8692 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8693 NewID->setInvalidDecl(); 8694 } 8695 } 8696 8697 // Process attributes attached to the ivar. 8698 ProcessDeclAttributes(S, NewID, D); 8699 8700 if (D.isInvalidType()) 8701 NewID->setInvalidDecl(); 8702 8703 // In ARC, infer 'retaining' for ivars of retainable type. 8704 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8705 NewID->setInvalidDecl(); 8706 8707 if (D.getDeclSpec().isModulePrivateSpecified()) 8708 NewID->setModulePrivate(); 8709 8710 if (II) { 8711 // FIXME: When interfaces are DeclContexts, we'll need to add 8712 // these to the interface. 8713 S->AddDecl(NewID); 8714 IdResolver.AddDecl(NewID); 8715 } 8716 8717 return NewID; 8718} 8719 8720/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8721/// class and class extensions. For every class @interface and class 8722/// extension @interface, if the last ivar is a bitfield of any type, 8723/// then add an implicit `char :0` ivar to the end of that interface. 8724void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8725 SmallVectorImpl<Decl *> &AllIvarDecls) { 8726 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8727 return; 8728 8729 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8730 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8731 8732 if (!Ivar->isBitField()) 8733 return; 8734 uint64_t BitFieldSize = 8735 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 8736 if (BitFieldSize == 0) 8737 return; 8738 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8739 if (!ID) { 8740 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8741 if (!CD->IsClassExtension()) 8742 return; 8743 } 8744 // No need to add this to end of @implementation. 8745 else 8746 return; 8747 } 8748 // All conditions are met. Add a new bitfield to the tail end of ivars. 8749 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8750 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8751 8752 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8753 DeclLoc, DeclLoc, 0, 8754 Context.CharTy, 8755 Context.getTrivialTypeSourceInfo(Context.CharTy, 8756 DeclLoc), 8757 ObjCIvarDecl::Private, BW, 8758 true); 8759 AllIvarDecls.push_back(Ivar); 8760} 8761 8762void Sema::ActOnFields(Scope* S, 8763 SourceLocation RecLoc, Decl *EnclosingDecl, 8764 llvm::ArrayRef<Decl *> Fields, 8765 SourceLocation LBrac, SourceLocation RBrac, 8766 AttributeList *Attr) { 8767 assert(EnclosingDecl && "missing record or interface decl"); 8768 8769 // If the decl this is being inserted into is invalid, then it may be a 8770 // redeclaration or some other bogus case. Don't try to add fields to it. 8771 if (EnclosingDecl->isInvalidDecl()) 8772 return; 8773 8774 // Verify that all the fields are okay. 8775 unsigned NumNamedMembers = 0; 8776 SmallVector<FieldDecl*, 32> RecFields; 8777 8778 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8779 bool ARCErrReported = false; 8780 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 8781 i != end; ++i) { 8782 FieldDecl *FD = cast<FieldDecl>(*i); 8783 8784 // Get the type for the field. 8785 const Type *FDTy = FD->getType().getTypePtr(); 8786 8787 if (!FD->isAnonymousStructOrUnion()) { 8788 // Remember all fields written by the user. 8789 RecFields.push_back(FD); 8790 } 8791 8792 // If the field is already invalid for some reason, don't emit more 8793 // diagnostics about it. 8794 if (FD->isInvalidDecl()) { 8795 EnclosingDecl->setInvalidDecl(); 8796 continue; 8797 } 8798 8799 // C99 6.7.2.1p2: 8800 // A structure or union shall not contain a member with 8801 // incomplete or function type (hence, a structure shall not 8802 // contain an instance of itself, but may contain a pointer to 8803 // an instance of itself), except that the last member of a 8804 // structure with more than one named member may have incomplete 8805 // array type; such a structure (and any union containing, 8806 // possibly recursively, a member that is such a structure) 8807 // shall not be a member of a structure or an element of an 8808 // array. 8809 if (FDTy->isFunctionType()) { 8810 // Field declared as a function. 8811 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8812 << FD->getDeclName(); 8813 FD->setInvalidDecl(); 8814 EnclosingDecl->setInvalidDecl(); 8815 continue; 8816 } else if (FDTy->isIncompleteArrayType() && Record && 8817 ((i + 1 == Fields.end() && !Record->isUnion()) || 8818 ((getLangOptions().MicrosoftExt || 8819 getLangOptions().CPlusPlus) && 8820 (i + 1 == Fields.end() || Record->isUnion())))) { 8821 // Flexible array member. 8822 // Microsoft and g++ is more permissive regarding flexible array. 8823 // It will accept flexible array in union and also 8824 // as the sole element of a struct/class. 8825 if (getLangOptions().MicrosoftExt) { 8826 if (Record->isUnion()) 8827 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8828 << FD->getDeclName(); 8829 else if (Fields.size() == 1) 8830 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8831 << FD->getDeclName() << Record->getTagKind(); 8832 } else if (getLangOptions().CPlusPlus) { 8833 if (Record->isUnion()) 8834 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8835 << FD->getDeclName(); 8836 else if (Fields.size() == 1) 8837 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8838 << FD->getDeclName() << Record->getTagKind(); 8839 } else if (NumNamedMembers < 1) { 8840 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8841 << FD->getDeclName(); 8842 FD->setInvalidDecl(); 8843 EnclosingDecl->setInvalidDecl(); 8844 continue; 8845 } 8846 if (!FD->getType()->isDependentType() && 8847 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 8848 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8849 << FD->getDeclName() << FD->getType(); 8850 FD->setInvalidDecl(); 8851 EnclosingDecl->setInvalidDecl(); 8852 continue; 8853 } 8854 // Okay, we have a legal flexible array member at the end of the struct. 8855 if (Record) 8856 Record->setHasFlexibleArrayMember(true); 8857 } else if (!FDTy->isDependentType() && 8858 RequireCompleteType(FD->getLocation(), FD->getType(), 8859 diag::err_field_incomplete)) { 8860 // Incomplete type 8861 FD->setInvalidDecl(); 8862 EnclosingDecl->setInvalidDecl(); 8863 continue; 8864 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8865 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8866 // If this is a member of a union, then entire union becomes "flexible". 8867 if (Record && Record->isUnion()) { 8868 Record->setHasFlexibleArrayMember(true); 8869 } else { 8870 // If this is a struct/class and this is not the last element, reject 8871 // it. Note that GCC supports variable sized arrays in the middle of 8872 // structures. 8873 if (i + 1 != Fields.end()) 8874 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8875 << FD->getDeclName() << FD->getType(); 8876 else { 8877 // We support flexible arrays at the end of structs in 8878 // other structs as an extension. 8879 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8880 << FD->getDeclName(); 8881 if (Record) 8882 Record->setHasFlexibleArrayMember(true); 8883 } 8884 } 8885 } 8886 if (Record && FDTTy->getDecl()->hasObjectMember()) 8887 Record->setHasObjectMember(true); 8888 } else if (FDTy->isObjCObjectType()) { 8889 /// A field cannot be an Objective-c object 8890 Diag(FD->getLocation(), diag::err_statically_allocated_object) 8891 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 8892 QualType T = Context.getObjCObjectPointerType(FD->getType()); 8893 FD->setType(T); 8894 } 8895 else if (!getLangOptions().CPlusPlus) { 8896 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 8897 // It's an error in ARC if a field has lifetime. 8898 // We don't want to report this in a system header, though, 8899 // so we just make the field unavailable. 8900 // FIXME: that's really not sufficient; we need to make the type 8901 // itself invalid to, say, initialize or copy. 8902 QualType T = FD->getType(); 8903 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 8904 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 8905 SourceLocation loc = FD->getLocation(); 8906 if (getSourceManager().isInSystemHeader(loc)) { 8907 if (!FD->hasAttr<UnavailableAttr>()) { 8908 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 8909 "this system field has retaining ownership")); 8910 } 8911 } else { 8912 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 8913 } 8914 ARCErrReported = true; 8915 } 8916 } 8917 else if (getLangOptions().ObjC1 && 8918 getLangOptions().getGC() != LangOptions::NonGC && 8919 Record && !Record->hasObjectMember()) { 8920 if (FD->getType()->isObjCObjectPointerType() || 8921 FD->getType().isObjCGCStrong()) 8922 Record->setHasObjectMember(true); 8923 else if (Context.getAsArrayType(FD->getType())) { 8924 QualType BaseType = Context.getBaseElementType(FD->getType()); 8925 if (BaseType->isRecordType() && 8926 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8927 Record->setHasObjectMember(true); 8928 else if (BaseType->isObjCObjectPointerType() || 8929 BaseType.isObjCGCStrong()) 8930 Record->setHasObjectMember(true); 8931 } 8932 } 8933 } 8934 // Keep track of the number of named members. 8935 if (FD->getIdentifier()) 8936 ++NumNamedMembers; 8937 } 8938 8939 // Okay, we successfully defined 'Record'. 8940 if (Record) { 8941 bool Completed = false; 8942 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8943 if (!CXXRecord->isInvalidDecl()) { 8944 // Set access bits correctly on the directly-declared conversions. 8945 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8946 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8947 I != E; ++I) 8948 Convs->setAccess(I, (*I)->getAccess()); 8949 8950 if (!CXXRecord->isDependentType()) { 8951 // Objective-C Automatic Reference Counting: 8952 // If a class has a non-static data member of Objective-C pointer 8953 // type (or array thereof), it is a non-POD type and its 8954 // default constructor (if any), copy constructor, copy assignment 8955 // operator, and destructor are non-trivial. 8956 // 8957 // This rule is also handled by CXXRecordDecl::completeDefinition(). 8958 // However, here we check whether this particular class is only 8959 // non-POD because of the presence of an Objective-C pointer member. 8960 // If so, objects of this type cannot be shared between code compiled 8961 // with instant objects and code compiled with manual retain/release. 8962 if (getLangOptions().ObjCAutoRefCount && 8963 CXXRecord->hasObjectMember() && 8964 CXXRecord->getLinkage() == ExternalLinkage) { 8965 if (CXXRecord->isPOD()) { 8966 Diag(CXXRecord->getLocation(), 8967 diag::warn_arc_non_pod_class_with_object_member) 8968 << CXXRecord; 8969 } else { 8970 // FIXME: Fix-Its would be nice here, but finding a good location 8971 // for them is going to be tricky. 8972 if (CXXRecord->hasTrivialCopyConstructor()) 8973 Diag(CXXRecord->getLocation(), 8974 diag::warn_arc_trivial_member_function_with_object_member) 8975 << CXXRecord << 0; 8976 if (CXXRecord->hasTrivialCopyAssignment()) 8977 Diag(CXXRecord->getLocation(), 8978 diag::warn_arc_trivial_member_function_with_object_member) 8979 << CXXRecord << 1; 8980 if (CXXRecord->hasTrivialDestructor()) 8981 Diag(CXXRecord->getLocation(), 8982 diag::warn_arc_trivial_member_function_with_object_member) 8983 << CXXRecord << 2; 8984 } 8985 } 8986 8987 // Adjust user-defined destructor exception spec. 8988 if (getLangOptions().CPlusPlus0x && 8989 CXXRecord->hasUserDeclaredDestructor()) 8990 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8991 8992 // Add any implicitly-declared members to this class. 8993 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8994 8995 // If we have virtual base classes, we may end up finding multiple 8996 // final overriders for a given virtual function. Check for this 8997 // problem now. 8998 if (CXXRecord->getNumVBases()) { 8999 CXXFinalOverriderMap FinalOverriders; 9000 CXXRecord->getFinalOverriders(FinalOverriders); 9001 9002 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9003 MEnd = FinalOverriders.end(); 9004 M != MEnd; ++M) { 9005 for (OverridingMethods::iterator SO = M->second.begin(), 9006 SOEnd = M->second.end(); 9007 SO != SOEnd; ++SO) { 9008 assert(SO->second.size() > 0 && 9009 "Virtual function without overridding functions?"); 9010 if (SO->second.size() == 1) 9011 continue; 9012 9013 // C++ [class.virtual]p2: 9014 // In a derived class, if a virtual member function of a base 9015 // class subobject has more than one final overrider the 9016 // program is ill-formed. 9017 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9018 << (NamedDecl *)M->first << Record; 9019 Diag(M->first->getLocation(), 9020 diag::note_overridden_virtual_function); 9021 for (OverridingMethods::overriding_iterator 9022 OM = SO->second.begin(), 9023 OMEnd = SO->second.end(); 9024 OM != OMEnd; ++OM) 9025 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9026 << (NamedDecl *)M->first << OM->Method->getParent(); 9027 9028 Record->setInvalidDecl(); 9029 } 9030 } 9031 CXXRecord->completeDefinition(&FinalOverriders); 9032 Completed = true; 9033 } 9034 } 9035 } 9036 } 9037 9038 if (!Completed) 9039 Record->completeDefinition(); 9040 9041 // Now that the record is complete, do any delayed exception spec checks 9042 // we were missing. 9043 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9044 const CXXDestructorDecl *Dtor = 9045 DelayedDestructorExceptionSpecChecks.back().first; 9046 if (Dtor->getParent() != Record) 9047 break; 9048 9049 assert(!Dtor->getParent()->isDependentType() && 9050 "Should not ever add destructors of templates into the list."); 9051 CheckOverridingFunctionExceptionSpec(Dtor, 9052 DelayedDestructorExceptionSpecChecks.back().second); 9053 DelayedDestructorExceptionSpecChecks.pop_back(); 9054 } 9055 9056 } else { 9057 ObjCIvarDecl **ClsFields = 9058 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9059 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9060 ID->setLocEnd(RBrac); 9061 // Add ivar's to class's DeclContext. 9062 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9063 ClsFields[i]->setLexicalDeclContext(ID); 9064 ID->addDecl(ClsFields[i]); 9065 } 9066 // Must enforce the rule that ivars in the base classes may not be 9067 // duplicates. 9068 if (ID->getSuperClass()) 9069 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9070 } else if (ObjCImplementationDecl *IMPDecl = 9071 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9072 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9073 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9074 // Ivar declared in @implementation never belongs to the implementation. 9075 // Only it is in implementation's lexical context. 9076 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9077 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9078 } else if (ObjCCategoryDecl *CDecl = 9079 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9080 // case of ivars in class extension; all other cases have been 9081 // reported as errors elsewhere. 9082 // FIXME. Class extension does not have a LocEnd field. 9083 // CDecl->setLocEnd(RBrac); 9084 // Add ivar's to class extension's DeclContext. 9085 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9086 ClsFields[i]->setLexicalDeclContext(CDecl); 9087 CDecl->addDecl(ClsFields[i]); 9088 } 9089 } 9090 } 9091 9092 if (Attr) 9093 ProcessDeclAttributeList(S, Record, Attr); 9094 9095 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9096 // set the visibility of this record. 9097 if (Record && !Record->getDeclContext()->isRecord()) 9098 AddPushedVisibilityAttribute(Record); 9099} 9100 9101/// \brief Determine whether the given integral value is representable within 9102/// the given type T. 9103static bool isRepresentableIntegerValue(ASTContext &Context, 9104 llvm::APSInt &Value, 9105 QualType T) { 9106 assert(T->isIntegralType(Context) && "Integral type required!"); 9107 unsigned BitWidth = Context.getIntWidth(T); 9108 9109 if (Value.isUnsigned() || Value.isNonNegative()) { 9110 if (T->isSignedIntegerOrEnumerationType()) 9111 --BitWidth; 9112 return Value.getActiveBits() <= BitWidth; 9113 } 9114 return Value.getMinSignedBits() <= BitWidth; 9115} 9116 9117// \brief Given an integral type, return the next larger integral type 9118// (or a NULL type of no such type exists). 9119static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9120 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9121 // enum checking below. 9122 assert(T->isIntegralType(Context) && "Integral type required!"); 9123 const unsigned NumTypes = 4; 9124 QualType SignedIntegralTypes[NumTypes] = { 9125 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9126 }; 9127 QualType UnsignedIntegralTypes[NumTypes] = { 9128 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9129 Context.UnsignedLongLongTy 9130 }; 9131 9132 unsigned BitWidth = Context.getTypeSize(T); 9133 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9134 : UnsignedIntegralTypes; 9135 for (unsigned I = 0; I != NumTypes; ++I) 9136 if (Context.getTypeSize(Types[I]) > BitWidth) 9137 return Types[I]; 9138 9139 return QualType(); 9140} 9141 9142EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9143 EnumConstantDecl *LastEnumConst, 9144 SourceLocation IdLoc, 9145 IdentifierInfo *Id, 9146 Expr *Val) { 9147 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9148 llvm::APSInt EnumVal(IntWidth); 9149 QualType EltTy; 9150 9151 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9152 Val = 0; 9153 9154 if (Val) { 9155 if (Enum->isDependentType() || Val->isTypeDependent()) 9156 EltTy = Context.DependentTy; 9157 else { 9158 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9159 SourceLocation ExpLoc; 9160 if (!Val->isValueDependent() && 9161 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9162 Val = 0; 9163 } else { 9164 if (!getLangOptions().CPlusPlus) { 9165 // C99 6.7.2.2p2: 9166 // The expression that defines the value of an enumeration constant 9167 // shall be an integer constant expression that has a value 9168 // representable as an int. 9169 9170 // Complain if the value is not representable in an int. 9171 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9172 Diag(IdLoc, diag::ext_enum_value_not_int) 9173 << EnumVal.toString(10) << Val->getSourceRange() 9174 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9175 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9176 // Force the type of the expression to 'int'. 9177 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9178 } 9179 } 9180 9181 if (Enum->isFixed()) { 9182 EltTy = Enum->getIntegerType(); 9183 9184 // C++0x [dcl.enum]p5: 9185 // ... if the initializing value of an enumerator cannot be 9186 // represented by the underlying type, the program is ill-formed. 9187 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9188 if (getLangOptions().MicrosoftExt) { 9189 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9190 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9191 } else 9192 Diag(IdLoc, diag::err_enumerator_too_large) 9193 << EltTy; 9194 } else 9195 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9196 } 9197 else { 9198 // C++0x [dcl.enum]p5: 9199 // If the underlying type is not fixed, the type of each enumerator 9200 // is the type of its initializing value: 9201 // - If an initializer is specified for an enumerator, the 9202 // initializing value has the same type as the expression. 9203 EltTy = Val->getType(); 9204 } 9205 } 9206 } 9207 } 9208 9209 if (!Val) { 9210 if (Enum->isDependentType()) 9211 EltTy = Context.DependentTy; 9212 else if (!LastEnumConst) { 9213 // C++0x [dcl.enum]p5: 9214 // If the underlying type is not fixed, the type of each enumerator 9215 // is the type of its initializing value: 9216 // - If no initializer is specified for the first enumerator, the 9217 // initializing value has an unspecified integral type. 9218 // 9219 // GCC uses 'int' for its unspecified integral type, as does 9220 // C99 6.7.2.2p3. 9221 if (Enum->isFixed()) { 9222 EltTy = Enum->getIntegerType(); 9223 } 9224 else { 9225 EltTy = Context.IntTy; 9226 } 9227 } else { 9228 // Assign the last value + 1. 9229 EnumVal = LastEnumConst->getInitVal(); 9230 ++EnumVal; 9231 EltTy = LastEnumConst->getType(); 9232 9233 // Check for overflow on increment. 9234 if (EnumVal < LastEnumConst->getInitVal()) { 9235 // C++0x [dcl.enum]p5: 9236 // If the underlying type is not fixed, the type of each enumerator 9237 // is the type of its initializing value: 9238 // 9239 // - Otherwise the type of the initializing value is the same as 9240 // the type of the initializing value of the preceding enumerator 9241 // unless the incremented value is not representable in that type, 9242 // in which case the type is an unspecified integral type 9243 // sufficient to contain the incremented value. If no such type 9244 // exists, the program is ill-formed. 9245 QualType T = getNextLargerIntegralType(Context, EltTy); 9246 if (T.isNull() || Enum->isFixed()) { 9247 // There is no integral type larger enough to represent this 9248 // value. Complain, then allow the value to wrap around. 9249 EnumVal = LastEnumConst->getInitVal(); 9250 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9251 ++EnumVal; 9252 if (Enum->isFixed()) 9253 // When the underlying type is fixed, this is ill-formed. 9254 Diag(IdLoc, diag::err_enumerator_wrapped) 9255 << EnumVal.toString(10) 9256 << EltTy; 9257 else 9258 Diag(IdLoc, diag::warn_enumerator_too_large) 9259 << EnumVal.toString(10); 9260 } else { 9261 EltTy = T; 9262 } 9263 9264 // Retrieve the last enumerator's value, extent that type to the 9265 // type that is supposed to be large enough to represent the incremented 9266 // value, then increment. 9267 EnumVal = LastEnumConst->getInitVal(); 9268 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9269 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9270 ++EnumVal; 9271 9272 // If we're not in C++, diagnose the overflow of enumerator values, 9273 // which in C99 means that the enumerator value is not representable in 9274 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9275 // permits enumerator values that are representable in some larger 9276 // integral type. 9277 if (!getLangOptions().CPlusPlus && !T.isNull()) 9278 Diag(IdLoc, diag::warn_enum_value_overflow); 9279 } else if (!getLangOptions().CPlusPlus && 9280 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9281 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9282 Diag(IdLoc, diag::ext_enum_value_not_int) 9283 << EnumVal.toString(10) << 1; 9284 } 9285 } 9286 } 9287 9288 if (!EltTy->isDependentType()) { 9289 // Make the enumerator value match the signedness and size of the 9290 // enumerator's type. 9291 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9292 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9293 } 9294 9295 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9296 Val, EnumVal); 9297} 9298 9299 9300Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9301 SourceLocation IdLoc, IdentifierInfo *Id, 9302 AttributeList *Attr, 9303 SourceLocation EqualLoc, Expr *val) { 9304 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9305 EnumConstantDecl *LastEnumConst = 9306 cast_or_null<EnumConstantDecl>(lastEnumConst); 9307 Expr *Val = static_cast<Expr*>(val); 9308 9309 // The scope passed in may not be a decl scope. Zip up the scope tree until 9310 // we find one that is. 9311 S = getNonFieldDeclScope(S); 9312 9313 // Verify that there isn't already something declared with this name in this 9314 // scope. 9315 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9316 ForRedeclaration); 9317 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9318 // Maybe we will complain about the shadowed template parameter. 9319 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9320 // Just pretend that we didn't see the previous declaration. 9321 PrevDecl = 0; 9322 } 9323 9324 if (PrevDecl) { 9325 // When in C++, we may get a TagDecl with the same name; in this case the 9326 // enum constant will 'hide' the tag. 9327 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9328 "Received TagDecl when not in C++!"); 9329 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9330 if (isa<EnumConstantDecl>(PrevDecl)) 9331 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9332 else 9333 Diag(IdLoc, diag::err_redefinition) << Id; 9334 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9335 return 0; 9336 } 9337 } 9338 9339 // C++ [class.mem]p13: 9340 // If T is the name of a class, then each of the following shall have a 9341 // name different from T: 9342 // - every enumerator of every member of class T that is an enumerated 9343 // type 9344 if (CXXRecordDecl *Record 9345 = dyn_cast<CXXRecordDecl>( 9346 TheEnumDecl->getDeclContext()->getRedeclContext())) 9347 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9348 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9349 9350 EnumConstantDecl *New = 9351 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9352 9353 if (New) { 9354 // Process attributes. 9355 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9356 9357 // Register this decl in the current scope stack. 9358 New->setAccess(TheEnumDecl->getAccess()); 9359 PushOnScopeChains(New, S); 9360 } 9361 9362 return New; 9363} 9364 9365void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9366 SourceLocation RBraceLoc, Decl *EnumDeclX, 9367 Decl **Elements, unsigned NumElements, 9368 Scope *S, AttributeList *Attr) { 9369 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9370 QualType EnumType = Context.getTypeDeclType(Enum); 9371 9372 if (Attr) 9373 ProcessDeclAttributeList(S, Enum, Attr); 9374 9375 if (Enum->isDependentType()) { 9376 for (unsigned i = 0; i != NumElements; ++i) { 9377 EnumConstantDecl *ECD = 9378 cast_or_null<EnumConstantDecl>(Elements[i]); 9379 if (!ECD) continue; 9380 9381 ECD->setType(EnumType); 9382 } 9383 9384 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9385 return; 9386 } 9387 9388 // TODO: If the result value doesn't fit in an int, it must be a long or long 9389 // long value. ISO C does not support this, but GCC does as an extension, 9390 // emit a warning. 9391 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9392 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9393 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9394 9395 // Verify that all the values are okay, compute the size of the values, and 9396 // reverse the list. 9397 unsigned NumNegativeBits = 0; 9398 unsigned NumPositiveBits = 0; 9399 9400 // Keep track of whether all elements have type int. 9401 bool AllElementsInt = true; 9402 9403 for (unsigned i = 0; i != NumElements; ++i) { 9404 EnumConstantDecl *ECD = 9405 cast_or_null<EnumConstantDecl>(Elements[i]); 9406 if (!ECD) continue; // Already issued a diagnostic. 9407 9408 const llvm::APSInt &InitVal = ECD->getInitVal(); 9409 9410 // Keep track of the size of positive and negative values. 9411 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9412 NumPositiveBits = std::max(NumPositiveBits, 9413 (unsigned)InitVal.getActiveBits()); 9414 else 9415 NumNegativeBits = std::max(NumNegativeBits, 9416 (unsigned)InitVal.getMinSignedBits()); 9417 9418 // Keep track of whether every enum element has type int (very commmon). 9419 if (AllElementsInt) 9420 AllElementsInt = ECD->getType() == Context.IntTy; 9421 } 9422 9423 // Figure out the type that should be used for this enum. 9424 QualType BestType; 9425 unsigned BestWidth; 9426 9427 // C++0x N3000 [conv.prom]p3: 9428 // An rvalue of an unscoped enumeration type whose underlying 9429 // type is not fixed can be converted to an rvalue of the first 9430 // of the following types that can represent all the values of 9431 // the enumeration: int, unsigned int, long int, unsigned long 9432 // int, long long int, or unsigned long long int. 9433 // C99 6.4.4.3p2: 9434 // An identifier declared as an enumeration constant has type int. 9435 // The C99 rule is modified by a gcc extension 9436 QualType BestPromotionType; 9437 9438 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9439 // -fshort-enums is the equivalent to specifying the packed attribute on all 9440 // enum definitions. 9441 if (LangOpts.ShortEnums) 9442 Packed = true; 9443 9444 if (Enum->isFixed()) { 9445 BestType = BestPromotionType = Enum->getIntegerType(); 9446 // We don't need to set BestWidth, because BestType is going to be the type 9447 // of the enumerators, but we do anyway because otherwise some compilers 9448 // warn that it might be used uninitialized. 9449 BestWidth = CharWidth; 9450 } 9451 else if (NumNegativeBits) { 9452 // If there is a negative value, figure out the smallest integer type (of 9453 // int/long/longlong) that fits. 9454 // If it's packed, check also if it fits a char or a short. 9455 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9456 BestType = Context.SignedCharTy; 9457 BestWidth = CharWidth; 9458 } else if (Packed && NumNegativeBits <= ShortWidth && 9459 NumPositiveBits < ShortWidth) { 9460 BestType = Context.ShortTy; 9461 BestWidth = ShortWidth; 9462 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9463 BestType = Context.IntTy; 9464 BestWidth = IntWidth; 9465 } else { 9466 BestWidth = Context.getTargetInfo().getLongWidth(); 9467 9468 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9469 BestType = Context.LongTy; 9470 } else { 9471 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9472 9473 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9474 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9475 BestType = Context.LongLongTy; 9476 } 9477 } 9478 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9479 } else { 9480 // If there is no negative value, figure out the smallest type that fits 9481 // all of the enumerator values. 9482 // If it's packed, check also if it fits a char or a short. 9483 if (Packed && NumPositiveBits <= CharWidth) { 9484 BestType = Context.UnsignedCharTy; 9485 BestPromotionType = Context.IntTy; 9486 BestWidth = CharWidth; 9487 } else if (Packed && NumPositiveBits <= ShortWidth) { 9488 BestType = Context.UnsignedShortTy; 9489 BestPromotionType = Context.IntTy; 9490 BestWidth = ShortWidth; 9491 } else if (NumPositiveBits <= IntWidth) { 9492 BestType = Context.UnsignedIntTy; 9493 BestWidth = IntWidth; 9494 BestPromotionType 9495 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9496 ? Context.UnsignedIntTy : Context.IntTy; 9497 } else if (NumPositiveBits <= 9498 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9499 BestType = Context.UnsignedLongTy; 9500 BestPromotionType 9501 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9502 ? Context.UnsignedLongTy : Context.LongTy; 9503 } else { 9504 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9505 assert(NumPositiveBits <= BestWidth && 9506 "How could an initializer get larger than ULL?"); 9507 BestType = Context.UnsignedLongLongTy; 9508 BestPromotionType 9509 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9510 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9511 } 9512 } 9513 9514 // Loop over all of the enumerator constants, changing their types to match 9515 // the type of the enum if needed. 9516 for (unsigned i = 0; i != NumElements; ++i) { 9517 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9518 if (!ECD) continue; // Already issued a diagnostic. 9519 9520 // Standard C says the enumerators have int type, but we allow, as an 9521 // extension, the enumerators to be larger than int size. If each 9522 // enumerator value fits in an int, type it as an int, otherwise type it the 9523 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9524 // that X has type 'int', not 'unsigned'. 9525 9526 // Determine whether the value fits into an int. 9527 llvm::APSInt InitVal = ECD->getInitVal(); 9528 9529 // If it fits into an integer type, force it. Otherwise force it to match 9530 // the enum decl type. 9531 QualType NewTy; 9532 unsigned NewWidth; 9533 bool NewSign; 9534 if (!getLangOptions().CPlusPlus && 9535 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9536 NewTy = Context.IntTy; 9537 NewWidth = IntWidth; 9538 NewSign = true; 9539 } else if (ECD->getType() == BestType) { 9540 // Already the right type! 9541 if (getLangOptions().CPlusPlus) 9542 // C++ [dcl.enum]p4: Following the closing brace of an 9543 // enum-specifier, each enumerator has the type of its 9544 // enumeration. 9545 ECD->setType(EnumType); 9546 continue; 9547 } else { 9548 NewTy = BestType; 9549 NewWidth = BestWidth; 9550 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9551 } 9552 9553 // Adjust the APSInt value. 9554 InitVal = InitVal.extOrTrunc(NewWidth); 9555 InitVal.setIsSigned(NewSign); 9556 ECD->setInitVal(InitVal); 9557 9558 // Adjust the Expr initializer and type. 9559 if (ECD->getInitExpr() && 9560 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9561 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9562 CK_IntegralCast, 9563 ECD->getInitExpr(), 9564 /*base paths*/ 0, 9565 VK_RValue)); 9566 if (getLangOptions().CPlusPlus) 9567 // C++ [dcl.enum]p4: Following the closing brace of an 9568 // enum-specifier, each enumerator has the type of its 9569 // enumeration. 9570 ECD->setType(EnumType); 9571 else 9572 ECD->setType(NewTy); 9573 } 9574 9575 Enum->completeDefinition(BestType, BestPromotionType, 9576 NumPositiveBits, NumNegativeBits); 9577} 9578 9579Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9580 SourceLocation StartLoc, 9581 SourceLocation EndLoc) { 9582 StringLiteral *AsmString = cast<StringLiteral>(expr); 9583 9584 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9585 AsmString, StartLoc, 9586 EndLoc); 9587 CurContext->addDecl(New); 9588 return New; 9589} 9590 9591DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9592 IdentifierInfo &ModuleName, 9593 SourceLocation ModuleNameLoc) { 9594 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9595 ModuleName, ModuleNameLoc); 9596 if (!Module) 9597 return true; 9598 9599 // FIXME: Actually create a declaration to describe the module import. 9600 (void)Module; 9601 return DeclResult((Decl *)0); 9602} 9603 9604void 9605Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9606 SourceLocation ModulePrivateKeyword) { 9607 assert(!Old->isModulePrivate() && "Old is module-private!"); 9608 9609 Diag(New->getLocation(), diag::err_module_private_follows_public) 9610 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9611 Diag(Old->getLocation(), diag::note_previous_declaration) 9612 << Old->getDeclName(); 9613 9614 // Drop the __module_private__ from the new declaration, since it's invalid. 9615 New->setModulePrivate(false); 9616} 9617 9618void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9619 SourceLocation PragmaLoc, 9620 SourceLocation NameLoc) { 9621 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9622 9623 if (PrevDecl) { 9624 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9625 } else { 9626 (void)WeakUndeclaredIdentifiers.insert( 9627 std::pair<IdentifierInfo*,WeakInfo> 9628 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9629 } 9630} 9631 9632void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9633 IdentifierInfo* AliasName, 9634 SourceLocation PragmaLoc, 9635 SourceLocation NameLoc, 9636 SourceLocation AliasNameLoc) { 9637 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9638 LookupOrdinaryName); 9639 WeakInfo W = WeakInfo(Name, NameLoc); 9640 9641 if (PrevDecl) { 9642 if (!PrevDecl->hasAttr<AliasAttr>()) 9643 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9644 DeclApplyPragmaWeak(TUScope, ND, W); 9645 } else { 9646 (void)WeakUndeclaredIdentifiers.insert( 9647 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9648 } 9649} 9650 9651Decl *Sema::getObjCDeclContext() const { 9652 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9653} 9654